tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c

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