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/libbpf.h>
7#include "sock_example.h"
8#include <unistd.h>
9#include <arpa/inet.h>
10
11int main(int ac, char **argv)
12{
13 struct bpf_object *obj;
14 struct bpf_program *prog;
15 int map_fd, prog_fd;
16 char filename[256];
17 int i, sock, err;
18 FILE *f;
19
20 snprintf(buf: filename, size: sizeof(filename), fmt: "%s_kern.o", argv[0]);
21
22 obj = bpf_object__open_file(filename, NULL);
23 if (libbpf_get_error(obj))
24 return 1;
25
26 prog = bpf_object__next_program(obj, NULL);
27 bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);
28
29 err = bpf_object__load(obj);
30 if (err)
31 return 1;
32
33 prog_fd = bpf_program__fd(prog);
34 map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
35
36 sock = open_raw_sock(name: "lo");
37
38 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
39 sizeof(prog_fd)) == 0);
40
41 f = popen("ping -4 -c5 localhost", "r");
42 (void) f;
43
44 for (i = 0; i < 5; i++) {
45 long long tcp_cnt, udp_cnt, icmp_cnt;
46 int key;
47
48 key = IPPROTO_TCP;
49 assert(bpf_map_lookup_elem(map_fd, &key, &tcp_cnt) == 0);
50
51 key = IPPROTO_UDP;
52 assert(bpf_map_lookup_elem(map_fd, &key, &udp_cnt) == 0);
53
54 key = IPPROTO_ICMP;
55 assert(bpf_map_lookup_elem(map_fd, &key, &icmp_cnt) == 0);
56
57 printf("TCP %lld UDP %lld ICMP %lld bytes\n",
58 tcp_cnt, udp_cnt, icmp_cnt);
59 sleep(1);
60 }
61
62 return 0;
63}
64

source code of linux/samples/bpf/sockex1_user.c