LXR linux/samples/bpf/sockex3

   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
   9struct flow_keys {
  10        __be32 src;
  11        __be32 dst;
  12        union {
  13                __be32 ports;
  14                __be16 port16[2];
  15        };
  16        __u32 ip_proto;
  17};
  18
  19struct pair {
  20        __u64 packets;
  21        __u64 bytes;
  22};
  23
  24int main(int argc, char **argv)
  25{
  26        char filename[256];
  27        FILE *f;
  28        int i, sock;
  29
  30        snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  31
  32        if (load_bpf_file(filename)) {
  33                printf("%s", bpf_log_buf);
  34                return 1;
  35        }
  36
  37        sock = open_raw_sock("lo");
  38
  39        assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
  40                          sizeof(__u32)) == 0);
  41
  42        if (argc > 1)
  43                f = popen("ping -c5 localhost", "r");
  44        else
  45                f = popen("netperf -l 4 localhost", "r");
  46        (void) f;
  47
  48        for (i = 0; i < 5; i++) {
  49                struct flow_keys key = {}, next_key;
  50                struct pair value;
  51
  52                sleep(1);
  53                printf("IP     src.port -> dst.port               bytes      packets\n");
  54                while (bpf_get_next_key(map_fd[2], &key, &next_key) == 0) {
  55                        bpf_lookup_elem(map_fd[2], &next_key, &value);
  56                        printf("%s.%05d -> %s.%05d %12lld %12lld\n",
  57                               inet_ntoa((struct in_addr){htonl(next_key.src)}),
  58                               next_key.port16[0],
  59                               inet_ntoa((struct in_addr){htonl(next_key.dst)}),
  60                               next_key.port16[1],
  61                               value.bytes, value.packets);
  62                        key = next_key;
  63                }
  64        }
  65        return 0;
  66}
  67