LXR linux/samples/bpf/sockex2

   1#include <stdio.h>
   2#include <assert.h>
   3#include <linux/bpf.h>
   4#include "libbpf.h"
   5#include "bpf_load.h"
   6#include <unistd.h>
   7#include <arpa/inet.h>
   8#include <sys/resource.h>
   9
  10struct pair {
  11        __u64 packets;
  12        __u64 bytes;
  13};
  14
  15int main(int ac, char **argv)
  16{
  17        struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  18        char filename[256];
  19        FILE *f;
  20        int i, sock;
  21
  22        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  23        setrlimit(RLIMIT_MEMLOCK, &r);
  24
  25        if (load_bpf_file(filename)) {
  26                printf("%s", bpf_log_buf);
  27                return 1;
  28        }
  29
  30        sock = open_raw_sock("lo");
  31
  32        assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
  33                          sizeof(prog_fd[0])) == 0);
  34
  35        f = popen("ping -c5 localhost", "r");
  36        (void) f;
  37
  38        for (i = 0; i < 5; i++) {
  39                int key = 0, next_key;
  40                struct pair value;
  41
  42                while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
  43                        bpf_lookup_elem(map_fd[0], &next_key, &value);
  44                        printf("ip %s bytes %lld packets %lld\n",
  45                               inet_ntoa((struct in_addr){htonl(next_key)}),
  46                               value.bytes, value.packets);
  47                        key = next_key;
  48                }
  49                sleep(1);
  50        }
  51        return 0;
  52}
  53