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21-xdp/.gitignore

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+.vscode
+package.json
+*.wasm
+ewasm-skel.h
+ecli
+ewasm
+*.o
+*.skel.json
+*.skel.yaml
+package.yaml

21-xdp/xdp.bpf.c

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+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+
+/// @ifindex 1
+/// @flags 0
+/// @xdpopts {"old_prog_fd":0}
+SEC("xdp")
+int xdp_pass(struct xdp_md* ctx) {
+    void* data = (void*)(long)ctx->data;
+    void* data_end = (void*)(long)ctx->data_end;
+    int pkt_sz = data_end - data;
+
+    bpf_printk("packet size is %d", pkt_sz);
+    return XDP_PASS;
+}
+
+char __license[] SEC("license") = "GPL";