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