samples/bpf/sockex3_user.c

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <linux/bpf.h>
   4 #include "libbpf.h"
   5 #include "bpf_load.h"
   6 #include "sock_example.h"
   7 #include <unistd.h>
   8 #include <arpa/inet.h>
   9 #include <sys/resource.h>
  10
  11 struct bpf_flow_keys {
  12         __be32 src;
  13         __be32 dst;
  14         union {
  15                 __be32 ports;
  16                 __be16 port16[2];
  17         };
  18         __u32 ip_proto;
  19 };
  20
  21 struct pair {
  22         __u64 packets;
  23         __u64 bytes;
  24 };
  25
  26 int main(int argc, char **argv)
  27 {
  28         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  29         char filename[256];
  30         FILE *f;
  31         int i, sock;
  32
  33         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  34         setrlimit(RLIMIT_MEMLOCK, &r);
  35
  36         if (load_bpf_file(filename)) {
  37                 printf("%s", bpf_log_buf);
  38                 return 1;
  39         }
  40
  41         sock = open_raw_sock("lo");
  42
  43         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
  44                           sizeof(__u32)) == 0);
  45
  46         if (argc > 1)
  47                 f = popen("ping -c5 localhost", "r");
  48         else
  49                 f = popen("netperf -l 4 localhost", "r");
  50         (void) f;
  51
  52         for (i = 0; i < 5; i++) {
  53                 struct bpf_flow_keys key = {}, next_key;
  54                 struct pair value;
  55
  56                 sleep(1);
  57                 printf("IP     src.port -> dst.port               bytes      packets\n");
  58                 while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
  59                         bpf_map_lookup_elem(map_fd[2], &next_key, &value);
  60                         printf("%s.%05d -> %s.%05d %12lld %12lld\n",
  61                                inet_ntoa((struct in_addr){htonl(next_key.src)}),
  62                                next_key.port16[0],
  63                                inet_ntoa((struct in_addr){htonl(next_key.dst)}),
  64                                next_key.port16[1],
  65                                value.bytes, value.packets);
  66                         key = next_key;
  67                 }
  68         }
  69         return 0;
  70 }