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
11 struct pair {
12 __u64 packets;
13 __u64 bytes;
14 };
15
16 int main(int ac, char **argv)
17 {
18 struct bpf_program *prog;
19 struct bpf_object *obj;
20 int map_fd, prog_fd;
21 char filename[256];
22 int i, sock, err;
23 FILE *f;
24
25 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
26 obj = bpf_object__open_file(filename, NULL);
27 if (libbpf_get_error(obj))
28 return 1;
29
30 prog = bpf_object__next_program(obj, NULL);
31 bpf_program__set_type(prog, BPF_PROG_TYPE_SOCKET_FILTER);
32
33 err = bpf_object__load(obj);
34 if (err)
35 return 1;
36
37 prog_fd = bpf_program__fd(prog);
38 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
39
40 sock = open_raw_sock("lo");
41
42 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
43 sizeof(prog_fd)) == 0);
44
45 f = popen("ping -4 -c5 localhost", "r");
46 (void) f;
47
48 for (i = 0; i < 5; i++) {
49 int key = 0, next_key;
50 struct pair value;
51
52 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
53 bpf_map_lookup_elem(map_fd, &next_key, &value);
54 printf("ip %s bytes %lld packets %lld\n",
55 inet_ntoa((struct in_addr){htonl(next_key)}),
56 value.bytes, value.packets);
57 key = next_key;
58 }
59 sleep(1);
60 }
61 return 0;
62 }
63
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