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 "libbpf.h"
   6 #include "bpf_load.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 rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  20         char filename[256];
  21         FILE *f;
  22         int i, sock;
  23
  24         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  25         setrlimit(RLIMIT_MEMLOCK, &r);
  26
  27         if (load_bpf_file(filename)) {
  28                 printf("%s", bpf_log_buf);
  29                 return 1;
  30         }
  31
  32         sock = open_raw_sock("lo");
  33
  34         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  35                           sizeof(prog_fd[0])) == 0);
  36
  37         f = popen("ping -c5 localhost", "r");
  38         (void) f;
  39
  40         for (i = 0; i < 5; i++) {
  41                 int key = 0, next_key;
  42                 struct pair value;
  43
  44                 while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
  45                         bpf_map_lookup_elem(map_fd[0], &next_key, &value);
  46                         printf("ip %s bytes %lld packets %lld\n",
  47                                inet_ntoa((struct in_addr){htonl(next_key)}),
  48                                value.bytes, value.packets);
  49                         key = next_key;
  50                 }
  51                 sleep(1);
  52         }
  53         return 0;
  54 }