LXR linux/samples/bpf/sockex1

   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
   9int main(int ac, char **argv)
  10{
  11        char filename[256];
  12        FILE *f;
  13        int i, sock;
  14
  15        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  16
  17        if (load_bpf_file(filename)) {
  18                printf("%s", bpf_log_buf);
  19                return 1;
  20        }
  21
  22        sock = open_raw_sock("lo");
  23
  24        assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  25                          sizeof(prog_fd[0])) == 0);
  26
  27        f = popen("ping -c5 localhost", "r");
  28        (void) f;
  29
  30        for (i = 0; i < 5; i++) {
  31                long long tcp_cnt, udp_cnt, icmp_cnt;
  32                int key;
  33
  34                key = IPPROTO_TCP;
  35                assert(bpf_lookup_elem(map_fd[0], &key, &tcp_cnt) == 0);
  36
  37                key = IPPROTO_UDP;
  38                assert(bpf_lookup_elem(map_fd[0], &key, &udp_cnt) == 0);
  39
  40                key = IPPROTO_ICMP;
  41                assert(bpf_lookup_elem(map_fd[0], &key, &icmp_cnt) == 0);
  42
  43                printf("TCP %lld UDP %lld ICMP %lld bytes\n",
  44                       tcp_cnt, udp_cnt, icmp_cnt);
  45                sleep(1);
  46        }
  47
  48        return 0;
  49}
  50