sockmap_tcp_msg_prog.c 700 B

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  1. #include <linux/bpf.h>
  2. #include "bpf_helpers.h"
  3. #include "bpf_util.h"
  4. #include "bpf_endian.h"
  5. int _version SEC("version") = 1;
  6. #define bpf_printk(fmt, ...) \
  7. ({ \
  8. char ____fmt[] = fmt; \
  9. bpf_trace_printk(____fmt, sizeof(____fmt), \
  10. ##__VA_ARGS__); \
  11. })
  12. SEC("sk_msg1")
  13. int bpf_prog1(struct sk_msg_md *msg)
  14. {
  15. void *data_end = (void *)(long) msg->data_end;
  16. void *data = (void *)(long) msg->data;
  17. char *d;
  18. if (data + 8 > data_end)
  19. return SK_DROP;
  20. bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
  21. d = (char *)data;
  22. bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
  23. return SK_PASS;
  24. }
  25. char _license[] SEC("license") = "GPL";