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 flow_keys {
10	__be32 src;
11	__be32 dst;
12	union {
13		__be32 ports;
14		__be16 port16[2];
15	};
16	__u32 ip_proto;
17};
18
19struct pair {
20	__u64 packets;
21	__u64 bytes;
22};
23
24int main(int argc, char **argv)
25{
26	char filename[256];
27	FILE *f;
28	int i, sock;
29
30	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
31
32	if (load_bpf_file(filename)) {
33		printf("%s", bpf_log_buf);
34		return 1;
35	}
36
37	sock = open_raw_sock("lo");
38
39	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
40			  sizeof(__u32)) == 0);
41
42	if (argc > 1)
43		f = popen("ping -c5 localhost", "r");
44	else
45		f = popen("netperf -l 4 localhost", "r");
46	(void) f;
47
48	for (i = 0; i < 5; i++) {
49		struct flow_keys key = {}, next_key;
50		struct pair value;
51
52		sleep(1);
53		printf("IP     src.port -> dst.port               bytes      packets\n");
54		while (bpf_get_next_key(map_fd[2], &key, &next_key) == 0) {
55			bpf_lookup_elem(map_fd[2], &next_key, &value);
56			printf("%s.%05d -> %s.%05d %12lld %12lld\n",
57			       inet_ntoa((struct in_addr){htonl(next_key.src)}),
58			       next_key.port16[0],
59			       inet_ntoa((struct in_addr){htonl(next_key.dst)}),
60			       next_key.port16[1],
61			       value.bytes, value.packets);
62			key = next_key;
63		}
64	}
65	return 0;
66}
67