LXR linux/samples/bpf/sockex3

   1// SPDX-License-Identifier: GPL-2.0
   2#include <stdio.h>
   3#include <assert.h>
   4#include <linux/bpf.h>
   5#include "libbpf.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
  16struct bpf_flow_keys {
  17        __be32 src;
  18        __be32 dst;
  19        union {
  20                __be32 ports;
  21                __be16 port16[2];
  22        };
  23        __u32 ip_proto;
  24};
  25
  26struct pair {
  27        __u64 packets;
  28        __u64 bytes;
  29};
  30
  31int 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 -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 bpf_flow_keys 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}
  85