LXR linux/samples/bpf/sockex1

   1// SPDX-License-Identifier: GPL-2.0
   2#include <stdio.h>
   3#include <assert.h>
   4#include <linux/bpf.h>
   5#include "libbpf.h"
   6#include "bpf_load.h"
   7#include "sock_example.h"
   8#include <unistd.h>
   9#include <arpa/inet.h>
  10
  11int main(int ac, char **argv)
  12{
  13        char filename[256];
  14        FILE *f;
  15        int i, sock;
  16
  17        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  18
  19        if (load_bpf_file(filename)) {
  20                printf("%s", bpf_log_buf);
  21                return 1;
  22        }
  23
  24        sock = open_raw_sock("lo");
  25
  26        assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  27                          sizeof(prog_fd[0])) == 0);
  28
  29        f = popen("ping -c5 localhost", "r");
  30        (void) f;
  31
  32        for (i = 0; i < 5; i++) {
  33                long long tcp_cnt, udp_cnt, icmp_cnt;
  34                int key;
  35
  36                key = IPPROTO_TCP;
  37                assert(bpf_map_lookup_elem(map_fd[0], &key, &tcp_cnt) == 0);
  38
  39                key = IPPROTO_UDP;
  40                assert(bpf_map_lookup_elem(map_fd[0], &key, &udp_cnt) == 0);
  41
  42                key = IPPROTO_ICMP;
  43                assert(bpf_map_lookup_elem(map_fd[0], &key, &icmp_cnt) == 0);
  44
  45                printf("TCP %lld UDP %lld ICMP %lld bytes\n",
  46                       tcp_cnt, udp_cnt, icmp_cnt);
  47                sleep(1);
  48        }
  49
  50        return 0;
  51}
  52