root/samples/bpf/sockex1_user.c

DEFINITIONS

1. main

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include <linux/bpf.h>
   5 #include <bpf/bpf.h>
   6 #include "libbpf.h"
   7 #include "sock_example.h"
   8 #include <unistd.h>
   9 #include <arpa/inet.h>
  10 
  11 int main(int ac, char **argv)
  12 {
  13         struct bpf_object *obj;
  14         int map_fd, prog_fd;
  15         char filename[256];
  16         int i, sock;
  17         FILE *f;
  18 
  19         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  20 
  21         if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
  22                           &obj, &prog_fd))
  23                 return 1;
  24 
  25         map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
  26 
  27         sock = open_raw_sock("lo");
  28 
  29         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
  30                           sizeof(prog_fd)) == 0);
  31 
  32         f = popen("ping -4 -c5 localhost", "r");
  33         (void) f;
  34 
  35         for (i = 0; i < 5; i++) {
  36                 long long tcp_cnt, udp_cnt, icmp_cnt;
  37                 int key;
  38 
  39                 key = IPPROTO_TCP;
  40                 assert(bpf_map_lookup_elem(map_fd, &key, &tcp_cnt) == 0);
  41 
  42                 key = IPPROTO_UDP;
  43                 assert(bpf_map_lookup_elem(map_fd, &key, &udp_cnt) == 0);
  44 
  45                 key = IPPROTO_ICMP;
  46                 assert(bpf_map_lookup_elem(map_fd, &key, &icmp_cnt) == 0);
  47 
  48                 printf("TCP %lld UDP %lld ICMP %lld bytes\n",
  49                        tcp_cnt, udp_cnt, icmp_cnt);
  50                 sleep(1);
  51         }
  52 
  53         return 0;
  54 }