root/samples/bpf/sockex3_user.c

DEFINITIONS

1. main

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include <linux/bpf.h>
   5 #include <bpf/bpf.h>
   6 #include "bpf_load.h"
   7 #include "sock_example.h"
   8 #include <unistd.h>
   9 #include <arpa/inet.h>
  10 #include <sys/resource.h>
  11 
  12 #define PARSE_IP 3
  13 #define PARSE_IP_PROG_FD (prog_fd[0])
  14 #define PROG_ARRAY_FD (map_fd[0])
  15 
  16 struct flow_key_record {
  17         __be32 src;
  18         __be32 dst;
  19         union {
  20                 __be32 ports;
  21                 __be16 port16[2];
  22         };
  23         __u32 ip_proto;
  24 };
  25 
  26 struct pair {
  27         __u64 packets;
  28         __u64 bytes;
  29 };
  30 
  31 int main(int argc, char **argv)
  32 {
  33         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
  34         char filename[256];
  35         FILE *f;
  36         int i, sock, err, id, key = PARSE_IP;
  37         struct bpf_prog_info info = {};
  38         uint32_t info_len = sizeof(info);
  39 
  40         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
  41         setrlimit(RLIMIT_MEMLOCK, &r);
  42 
  43         if (load_bpf_file(filename)) {
  44                 printf("%s", bpf_log_buf);
  45                 return 1;
  46         }
  47 
  48         /* Test fd array lookup which returns the id of the bpf_prog */
  49         err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
  50         assert(!err);
  51         err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
  52         assert(!err);
  53         assert(id == info.id);
  54 
  55         sock = open_raw_sock("lo");
  56 
  57         assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
  58                           sizeof(__u32)) == 0);
  59 
  60         if (argc > 1)
  61                 f = popen("ping -4 -c5 localhost", "r");
  62         else
  63                 f = popen("netperf -l 4 localhost", "r");
  64         (void) f;
  65 
  66         for (i = 0; i < 5; i++) {
  67                 struct flow_key_record key = {}, next_key;
  68                 struct pair value;
  69 
  70                 sleep(1);
  71                 printf("IP     src.port -> dst.port               bytes      packets\n");
  72                 while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
  73                         bpf_map_lookup_elem(map_fd[2], &next_key, &value);
  74                         printf("%s.%05d -> %s.%05d %12lld %12lld\n",
  75                                inet_ntoa((struct in_addr){htonl(next_key.src)}),
  76                                next_key.port16[0],
  77                                inet_ntoa((struct in_addr){htonl(next_key.dst)}),
  78                                next_key.port16[1],
  79                                value.bytes, value.packets);
  80                         key = next_key;
  81                 }
  82         }
  83         return 0;
  84 }