samples/bpf/sockex2_user.c

   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 <bpf/libbpf.h>
   7 #include "sock_example.h"
   8 #include <unistd.h>
   9 #include <arpa/inet.h>
  10
  11 struct pair {
  12         __u64 packets;
  13         __u64 bytes;
  14 };
  15
  16 int main(int ac, char **argv)
  17 {
  18         struct bpf_program *prog;
  19         struct bpf_object *obj;
  20         int map_fd, prog_fd;
  21         char filename[256];
  22         int i, sock, err;
  23         FILE *f;
  24
  25         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  26         obj = bpf_object__open_file(filename, NULL);
  27         if (libbpf_get_error(obj))
  28                 return 1;
  29
  30         prog = bpf_object__next_program(obj, NULL);
  31         bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);
  32
  33         err = bpf_object__load(obj);
  34         if (err)
  35                 return 1;
  36
  37         prog_fd = bpf_program__fd(prog);
  38         map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
  39
  40         sock = open_raw_sock("lo");
  41
  42         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
  43                           sizeof(prog_fd)) == 0);
  44
  45         f = popen("ping -4 -c5 localhost", "r");
  46         (void) f;
  47
  48         for (i = 0; i < 5; i++) {
  49                 int key = 0, next_key;
  50                 struct pair value;
  51
  52                 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
  53                         bpf_map_lookup_elem(map_fd, &next_key, &value);
  54                         printf("ip %s bytes %lld packets %lld\n",
  55                                inet_ntoa((struct in_addr){htonl(next_key)}),
  56                                value.bytes, value.packets);
  57                         key = next_key;
  58                 }
  59                 sleep(1);
  60         }
  61         return 0;
  62 }