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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../https://github.com/eunomia-bpf/bpf-developer-tutorial.html">https://github.com/eunomia-bpf/bpf-developer-tutorial</a></li><li class="chapter-item expanded affix "><li class="part-title">目录</li><li class="chapter-item expanded "><a href="../0-introduce/index.html"><strong aria-hidden="true">1.</strong> 介绍 eBPF 的基本概念、常见的开发工具</a></li><li class="chapter-item expanded "><a href="../1-helloworld/index.html"><strong aria-hidden="true">2.</strong> eBPF Hello World，基本框架和开发流程</a></li><li class="chapter-item expanded "><a href="../2-kprobe-unlink/index.html"><strong aria-hidden="true">3.</strong> 使用 kprobe 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../3-fentry-unlink/index.html"><strong aria-hidden="true">4.</strong> 使用 fentry 监测捕获 unlink 系统调用</a></li><li class="chapter-item expanded "><a href="../4-opensnoop/index.html"><strong aria-hidden="true">5.</strong> 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</a></li><li class="chapter-item expanded "><a href="../5-uprobe-bashreadline/index.html"><strong aria-hidden="true">6.</strong> 使用 uprobe 捕获 bash 的 readline 函数调用</a></li><li class="chapter-item expanded "><a href="../6-sigsnoop/index.html"><strong aria-hidden="true">7.</strong> 捕获进程发送信号的系统调用集合，使用 hash map 保存状态</a></li><li class="chapter-item expanded "><a href="../7-execsnoop/index.html"><strong aria-hidden="true">8.</strong> 捕获进程执行/退出时间，通过 perf event array 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../8-exitsnoop/index.html"><strong aria-hidden="true">9.</strong> 使用 exitsnoop 监控进程退出事件，使用 ring buffer 向用户态打印输出</a></li><li class="chapter-item expanded "><a href="../9-runqlat/index.html"><strong aria-hidden="true">10.</strong> 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</a></li><li class="chapter-item expanded "><a href="../10-hardirqs/index.html"><strong aria-hidden="true">11.</strong> 使用 hardirqs 或 softirqs 捕获中断事件</a></li><li class="chapter-item expanded "><a href="../11-bootstrap/index.html"><strong aria-hidden="true">12.</strong> 使用 bootstrap 开发用户态程序并跟踪 exec() 和 exit() 系统调用</a></li><li class="chapter-item expanded "><a href="../13-tcpconnlat/index.html"><strong aria-hidden="true">13.</strong> 使用 libbpf-bootstrap 开发程序统计 TCP 连接延时</a></li><li class="chapter-item expanded "><a href="../14-tcpstates/index.html"><strong aria-hidden="true">14.</strong> 使用 libbpf-bootstrap 记录 TCP 连接状态与 TCP RTT</a></li><li class="chapter-item expanded "><a href="../15-javagc/index.html"><strong aria-hidden="true">15.</strong> 使用 USDT 捕获用户态 Java GC 事件耗时</a></li><li class="chapter-item expanded "><a href="../16-memleak/index.html"><strong aria-hidden="true">16.</strong> 编写 eBPF 程序 Memleak 监控内存泄漏</a></li><li class="chapter-item expanded "><a href="../17-biopattern/index.html"><strong aria-hidden="true">17.</strong> 编写 eBPF 程序 Biopattern 统计随机/顺序磁盘 I/O</a></li><li class="chapter-item expanded "><a href="../18-further-reading/index.html"><strong aria-hidden="true">18.</strong> 更多的参考资料：论文列表、项目、博客等等</a></li><li class="chapter-item expanded "><a href="../19-lsm-connect/index.html"><strong aria-hidden="true">19.</strong> 使用 LSM 进行安全检测防御</a></li><li class="chapter-item expanded "><a href="../20-tc/index.html"><strong aria-hidden="true">20.</strong> 使用 eBPF 进行 tc 流量控制</a></li><li class="chapter-item expanded affix "><li class="part-title">eBPF 高级特性与进阶主题</li><li class="chapter-item expanded "><a href="../22-android/index.html"><strong aria-hidden="true">21.</strong> 在 Android 上使用 eBPF 程序</a></li><li class="chapter-item expanded "><a href="../23-http/index.html"><strong aria-hidden="true">22.</strong> 使用 eBPF socket filter 或 syscall tracepoint 追踪 HTTP 请求等七层协议</a></li><li class="chapter-item expanded "><a href="../30-sslsniff/index.html"><strong aria-hidden="true">23.</strong> 使用 uprobe 捕获多种库的 SSL/TLS 明文数据</a></li><li class="chapter-item expanded "><a href="../29-sockops/index.html"><strong aria-hidden="true">24.</strong> 使用 sockops 加速网络请求转发</a></li><li class="chapter-item expanded "><a href="../24-hide/index.html"><strong aria-hidden="true">25.</strong> 使用 eBPF 隐藏进程或文件信息</a></li><li class="chapter-item expanded "><a href="../25-signal/index.html"><strong aria-hidden="true">26.</strong> 使用 bpf_send_signal 发送信号终止进程</a></li><li class="chapter-item expanded "><a href="../26-sudo/index.html"><strong aria-hidden="true">27.</strong> 使用 eBPF 添加 sudo 用户</a></li><li class="chapter-item expanded "><a href="../27-replace/index.html"><strong aria-hidden="true">28.</strong> 使用 eBPF 替换任意程序读取或写入的文本</a></li><li class="chapter-item expanded "><a href="../28-detach/index.html"><strong aria-hidden="true">29.</strong> 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</a></li><li class="chapter-item expanded "><a href="../30-sslsniff/index.html"><strong aria-hidden="true">30.</strong> 使用 eBPF 用户态捕获多种库的 SSL/TLS 明文数据</a></li><li class="chapter-item expanded affix "><li class="part-title">bcc 教程与文档</li><li class="chapter-item expanded "><a href="../bcc-documents/kernel-versions.html"><strong aria-hidden="true">31.</strong> BPF Features by Linux Kernel Version</a></li><li class="chapter-item expanded "><a href="../bcc-documents/kernel_config.html" class="active"><strong aria-hidden="true">32.</strong> Kernel Configuration for BPF Features</a></li><li class="chapter-item expanded "><a href="../bcc-documents/reference_guide.html"><strong aria-hidden="true">33.</strong> bcc Reference Guide</a></li><li class="chapter-item expanded "><a href="../bcc-documents/special_filtering.html"><strong aria-hidden="true">34.</strong> Special Filtering</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial.html"><strong aria-hidden="true">35.</strong> bcc Tutorial</a></li><li class="chapter-item expanded "><a href="../bcc-documents/tutorial_bcc_python_developer.html"><strong aria-hidden="true">36.</strong> bcc Python Developer Tutorial</a></li></ol>
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<h1 id="bpf-特性的内核配置"><a class="header" href="#bpf-特性的内核配置">BPF 特性的内核配置</a></h1>
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<h2 id="与-bpf-相关的内核配置"><a class="header" href="#与-bpf-相关的内核配置">与 BPF 相关的内核配置</a></h2>
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<div class="table-wrapper"><table><thead><tr><th style="text-align: left">功能</th><th style="text-align: left">内核配置</th><th style="text-align: left">描述</th></tr></thead><tbody>
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<tr><td style="text-align: left"><strong>基础</strong></td><td style="text-align: left">CONFIG_BPF_SYSCALL</td><td style="text-align: left">启用 bpf() 系统调用</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_JIT</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_BPF_JIT</td><td style="text-align: left">启用 BPF 即时编译器</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_EBPF_JIT</td><td style="text-align: left">扩展 BPF JIT (eBPF)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_CBPF_JIT</td><td style="text-align: left">经典 BPF JIT (cBPF)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_MODULES</td><td style="text-align: left">启用可加载内核模块的构建</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF</td><td style="text-align: left">BPF VM 解释器</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_EVENTS</td><td style="text-align: left">允许用户将 BPF 程序附加到 kprobe、uprobe 和 tracepoint 事件上</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PERF_EVENTS</td><td style="text-align: left">内核性能事件和计数器</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_PERF_EVENTS</td><td style="text-align: left">启用性能事件</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PROFILING</td><td style="text-align: left">启用分析器使用的扩展分析支持机制</td></tr>
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<tr><td style="text-align: left"><strong>BTF</strong></td><td style="text-align: left">CONFIG_DEBUG_INFO_BTF</td><td style="text-align: left">从 DWARF 调试信息生成去重的 BTF 类型信息</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_PAHOLE_HAS_SPLIT_BTF</td><td style="text-align: left">为每个选定的内核模块生成 BTF</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_DEBUG_INFO_BTF_MODULES</td><td style="text-align: left">为内核模块生成紧凑的分割 BTF 类型信息</td></tr>
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<tr><td style="text-align: left"><strong>安全</strong></td><td style="text-align: left">CONFIG_BPF_JIT_ALWAYS_ON</td><td style="text-align: left">启用 BPF JIT 并删除 BPF 解释器以避免猜测执行</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_UNPRIV_DEFAULT_OFF</td><td style="text-align: left">通过设置默认禁用非特权 BPF</td></tr>
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<tr><td style="text-align: left"><strong>Cgroup</strong></td><td style="text-align: left">CONFIG_CGROUP_BPF</td><td style="text-align: left">支持将 BPF 程序附加到 cgroup 上</td></tr>
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<tr><td style="text-align: left"><strong>网络</strong></td><td style="text-align: left">CONFIG_BPFILTER</td><td style="text-align: left">基于 BPF 的数据包过滤框架 (BPFILTER)</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPFILTER_UMH</td><td style="text-align: left">使用内嵌的用户模式助手构建 bpfilter 内核模块</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_NET_CLS_BPF</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_BPF_STREAM_PARSER</td><td style="text-align: left">启用此功能，允许使用BPF_MAP_TYPE_SOCKMAP与TCP流解析器配合使用</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_LWTUNNEL_BPF</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_NETFILTER_XT_MATCH_BPF</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_IPV6_SEG6_BPF</td><td style="text-align: left">为支持BPF seg6local挂钩，添加IPv6 Segement Routing助手 <a href="https://github.com/torvalds/linux/commit/fe94cc290f535709d3c5ebd1e472dfd0aec7ee7">参考</a></td></tr>
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<tr><td style="text-align: left"><strong>kprobes</strong></td><td style="text-align: left">CONFIG_KPROBE_EVENTS</td><td style="text-align: left">允许用户通过ftrace接口动态添加跟踪事件（类似于tracepoints）</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_KPROBES</td><td style="text-align: left">启用基于kprobes的动态事件</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_KPROBES</td><td style="text-align: left">检查是否启用了kprobes</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_REGS_AND_STACK_ACCESS_API</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_KPROBES_ON_FTRACE</td><td style="text-align: left">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</td></tr>
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<tr><td style="text-align: left"><strong>kprobe multi</strong></td><td style="text-align: left">CONFIG_FPROBE</td><td style="text-align: left">启用fprobe以一次性在多个函数上附加探测点</td></tr>
|
||
<tr><td style="text-align: left"><strong>kprobe override</strong></td><td style="text-align: left">CONFIG_BPF_KPROBE_OVERRIDE</td><td style="text-align: left">启用BPF程序覆盖kprobed函数</td></tr>
|
||
<tr><td style="text-align: left"><strong>uprobes</strong></td><td style="text-align: left">CONFIG_UPROBE_EVENTS</td><td style="text-align: left">启用基于uprobes的动态事件</td></tr>
|
||
<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_ARCH_SUPPORTS_UPROBES</td><td style="text-align: left">架构特定的uprobes支持</td></tr>
|
||
<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_UPROBES</td><td style="text-align: left">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。</td></tr>
|
||
<tr><td style="text-align: left"><strong>Tracepoints</strong></td><td style="text-align: left">CONFIG_TRACEPOINTS</td><td style="text-align: left">启用在内核中插入Tracepoints并与问题函数连接</td></tr>
|
||
<tr><td style="text-align: left"></td><td style="text-align: left">CONFIG_HAVE_SYSCALL_TRACEPOINTS</td><td style="text-align: left">启用系统调用进入/退出跟踪</td></tr>
|
||
<tr><td style="text-align: left"><strong>Raw Tracepoints</strong></td><td style="text-align: left">Same as Tracepoints</td><td style="text-align: left"></td></tr>
|
||
<tr><td style="text-align: left"><strong>LSM</strong></td><td style="text-align: left">CONFIG_BPF_LSM</td><td style="text-align: left">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</td></tr>
|
||
<tr><td style="text-align: left"><strong>LIRC</strong></td><td style="text-align: left">CONFIG_BPF_LIRC_MODE2</td><td style="text-align: left">允许将BPF程序附加到lirc设备</td></tr>
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