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_program *prog;
  20         struct bpf_object *obj;
  21         int map_fd, prog_fd;
  22         char filename[256];
  23         int i, sock, err;
  24         FILE *f;
  25
  26         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  27         obj = bpf_object__open_file(filename, NULL);
  28         if (libbpf_get_error(obj))
  29                 return 1;
  30
  31         prog = bpf_object__next_program(obj, NULL);
  32         bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);
  33
  34         err = bpf_object__load(obj);
  35         if (err)
  36                 return 1;
  37
  38         prog_fd = bpf_program__fd(prog);
  39         map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
  40
  41         sock = open_raw_sock("lo");
  42
  43         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
  44                           sizeof(prog_fd)) == 0);
  45
  46         f = popen("ping -4 -c5 localhost", "r");
  47         (void) f;
  48
  49         for (i = 0; i < 5; i++) {
  50                 int key = 0, next_key;
  51                 struct pair value;
  52
  53                 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
  54                         bpf_map_lookup_elem(map_fd, &next_key, &value);
  55                         printf("ip %s bytes %lld packets %lld\n",
  56                                inet_ntoa((struct in_addr){htonl(next_key)}),
  57                                value.bytes, value.packets);
  58                         key = next_key;
  59                 }
  60                 sleep(1);
  61         }
  62         return 0;
  63 }