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