LXR linux/samples/bpf/sockex2

   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
   9struct pair {
  10        __u64 packets;
  11        __u64 bytes;
  12};
  13
  14int 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}
  50