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 #define PARSE_IP 3
  12 #define PARSE_IP_PROG_FD (prog_fd[0])
  13 #define PROG_ARRAY_FD (map_fd[0])
  14
  15 struct bpf_flow_keys {
  16         __be32 src;
  17         __be32 dst;
  18         union {
  19                 __be32 ports;
  20                 __be16 port16[2];
  21         };
  22         __u32 ip_proto;
  23 };
  24
  25 struct pair {
  26         __u64 packets;
  27         __u64 bytes;
  28 };
  29
  30 int main(int argc, char **argv)
  31 {
  32         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  33         char filename[256];
  34         FILE *f;
  35         int i, sock, err, id, key = PARSE_IP;
  36         struct bpf_prog_info info = {};
  37         uint32_t info_len = sizeof(info);
  38
  39         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  40         setrlimit(RLIMIT_MEMLOCK, &r);
  41
  42         if (load_bpf_file(filename)) {
  43                 printf("%s", bpf_log_buf);
  44                 return 1;
  45         }
  46
  47         /* Test fd array lookup which returns the id of the bpf_prog */
  48         err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
  49         assert(!err);
  50         err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
  51         assert(!err);
  52         assert(id == info.id);
  53
  54         sock = open_raw_sock("lo");
  55
  56         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
  57                           sizeof(__u32)) == 0);
  58
  59         if (argc > 1)
  60                 f = popen("ping -c5 localhost", "r");
  61         else
  62                 f = popen("netperf -l 4 localhost", "r");
  63         (void) f;
  64
  65         for (i = 0; i < 5; i++) {
  66                 struct bpf_flow_keys key = {}, next_key;
  67                 struct pair value;
  68
  69                 sleep(1);
  70                 printf("IP     src.port -> dst.port               bytes      packets\n");
  71                 while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
  72                         bpf_map_lookup_elem(map_fd[2], &next_key, &value);
  73                         printf("%s.%05d -> %s.%05d %12lld %12lld\n",
  74                                inet_ntoa((struct in_addr){htonl(next_key.src)}),
  75                                next_key.port16[0],
  76                                inet_ntoa((struct in_addr){htonl(next_key.dst)}),
  77                                next_key.port16[1],
  78                                value.bytes, value.packets);
  79                         key = next_key;
  80                 }
  81         }
  82         return 0;
  83 }