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