root/samples/bpf/sockex2_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 #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         struct bpf_object *obj;
  21         int map_fd, prog_fd;
  22         char filename[256];
  23         int i, sock;
  24         FILE *f;
  25 
  26         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  27         setrlimit(RLIMIT_MEMLOCK, &r);
  28 
  29         if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
  30                           &obj, &prog_fd))
  31                 return 1;
  32 
  33         map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
  34 
  35         sock = open_raw_sock("lo");
  36 
  37         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
  38                           sizeof(prog_fd)) == 0);
  39 
  40         f = popen("ping -4 -c5 localhost", "r");
  41         (void) f;
  42 
  43         for (i = 0; i < 5; i++) {
  44                 int key = 0, next_key;
  45                 struct pair value;
  46 
  47                 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
  48                         bpf_map_lookup_elem(map_fd, &next_key, &value);
  49                         printf("ip %s bytes %lld packets %lld\n",
  50                                inet_ntoa((struct in_addr){htonl(next_key)}),
  51                                value.bytes, value.packets);
  52                         key = next_key;
  53                 }
  54                 sleep(1);
  55         }
  56         return 0;
  57 }