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 #include <sys/resource.h>
   9
  10 struct pair {
  11         __u64 packets;
  12         __u64 bytes;
  13 };
  14
  15 int main(int ac, char **argv)
  16 {
  17         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  18         char filename[256];
  19         FILE *f;
  20         int i, sock;
  21
  22         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  23         setrlimit(RLIMIT_MEMLOCK, &r);
  24
  25         if (load_bpf_file(filename)) {
  26                 printf("%s", bpf_log_buf);
  27                 return 1;
  28         }
  29
  30         sock = open_raw_sock("lo");
  31
  32         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  33                           sizeof(prog_fd[0])) == 0);
  34
  35         f = popen("ping -c5 localhost", "r");
  36         (void) f;
  37
  38         for (i = 0; i < 5; i++) {
  39                 int key = 0, next_key;
  40                 struct pair value;
  41
  42                 while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
  43                         bpf_lookup_elem(map_fd[0], &next_key, &value);
  44                         printf("ip %s bytes %lld packets %lld\n",
  45                                inet_ntoa((struct in_addr){htonl(next_key)}),
  46                                value.bytes, value.packets);
  47                         key = next_key;
  48                 }
  49                 sleep(1);
  50         }
  51         return 0;
  52 }