LXR linux/samples/bpf/sockex2

   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
  12struct pair {
  13        __u64 packets;
  14        __u64 bytes;
  15};
  16
  17int 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}
  56