1#include <stdio.h>
 2#include <assert.h>
 3#include <linux/bpf.h>
 4#include "libbpf.h"
 5#include "bpf_load.h"
 6#include <unistd.h>
 7#include <arpa/inet.h>
 8
 9struct pair {
10	__u64 packets;
11	__u64 bytes;
12};
13
14int main(int ac, char **argv)
15{
16	char filename[256];
17	FILE *f;
18	int i, sock;
19
20	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
21
22	if (load_bpf_file(filename)) {
23		printf("%s", bpf_log_buf);
24		return 1;
25	}
26
27	sock = open_raw_sock("lo");
28
29	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, prog_fd,
30			  sizeof(prog_fd[0])) == 0);
31
32	f = popen("ping -c5 localhost", "r");
33	(void) f;
34
35	for (i = 0; i < 5; i++) {
36		int key = 0, next_key;
37		struct pair value;
38
39		while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) {
40			bpf_lookup_elem(map_fd[0], &next_key, &value);
41			printf("ip %s bytes %lld packets %lld\n",
42			       inet_ntoa((struct in_addr){htonl(next_key)}),
43			       value.bytes, value.packets);
44			key = next_key;
45		}
46		sleep(1);
47	}
48	return 0;
49}