tools/testing/selftests/bpf/sockmap_tcp_msg_prog.c

   1 #include <linux/bpf.h>
   2 #include "bpf_helpers.h"
   3 #include "bpf_util.h"
   4 #include "bpf_endian.h"
   5
   6 int _version SEC("version") = 1;
   7
   8 #define bpf_printk(fmt, ...)                                    \
   9 ({                                                              \
  10                char ____fmt[] = fmt;                            \
  11                bpf_trace_printk(____fmt, sizeof(____fmt),       \
  12                                 ##__VA_ARGS__);                 \
  13 })
  14
  15 SEC("sk_msg1")
  16 int bpf_prog1(struct sk_msg_md *msg)
  17 {
  18         void *data_end = (void *)(long) msg->data_end;
  19         void *data = (void *)(long) msg->data;
  20
  21         char *d;
  22
  23         if (data + 8 > data_end)
  24                 return SK_DROP;
  25
  26         bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
  27         d = (char *)data;
  28         bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
  29
  30         return SK_PASS;
  31 }
  32
  33 char _license[] SEC("license") = "GPL";