samples/bpf/sockex2_user.c

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <linux/bpf.h>
   4 #include "libbpf.h"
   5 #include "bpf_load.h"
   6 #include <unistd.h>
   7 #include <arpa/inet.h>
   8
   9 struct pair {
  10         __u64 packets;
  11         __u64 bytes;
  12 };
  13
  14 int main(int ac, char **argv)
  15 {
  16         char filename[256];
  17         FILE *f;
  18         int i, sock;
  19
  20         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  21
  22         if (load_bpf_file(filename)) {
  23                 printf("%s", bpf_log_buf);
  24                 return 1;
  25         }
  26
  27         sock = open_raw_sock("lo");
  28
  29         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  30                           sizeof(prog_fd[0])) == 0);
  31
  32         f = popen("ping -c5 localhost", "r");
  33         (void) f;
  34
  35         for (i = 0; i < 5; i++) {
  36                 int key = 0, next_key;
  37                 struct pair value;
  38
  39                 while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
  40                         bpf_lookup_elem(map_fd[0], &next_key, &value);
  41                         printf("ip %s bytes %lld packets %lld\n",
  42                                inet_ntoa((struct in_addr){htonl(next_key)}),
  43                                value.bytes, value.packets);
  44                         key = next_key;
  45                 }
  46                 sleep(1);
  47         }
  48         return 0;
  49 }