1#include <stdio.h>
 2#include <assert.h>
 3#include <linux/bpf.h>
 4#include "libbpf.h"
 5#include "bpf_load.h"
 6#include "sock_example.h"
 7#include <unistd.h>
 8#include <arpa/inet.h>
 9#include <sys/resource.h>
10
11struct bpf_flow_keys {
12	__be32 src;
13	__be32 dst;
14	union {
15		__be32 ports;
16		__be16 port16[2];
17	};
18	__u32 ip_proto;
19};
20
21struct pair {
22	__u64 packets;
23	__u64 bytes;
24};
25
26int main(int argc, char **argv)
27{
28	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
29	char filename[256];
30	FILE *f;
31	int i, sock;
32
33	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
34	setrlimit(RLIMIT_MEMLOCK, &r);
35
36	if (load_bpf_file(filename)) {
37		printf("%s", bpf_log_buf);
38		return 1;
39	}
40
41	sock = open_raw_sock("lo");
42
43	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
44			  sizeof(__u32)) == 0);
45
46	if (argc > 1)
47		f = popen("ping -c5 localhost", "r");
48	else
49		f = popen("netperf -l 4 localhost", "r");
50	(void) f;
51
52	for (i = 0; i < 5; i++) {
53		struct bpf_flow_keys key = {}, next_key;
54		struct pair value;
55
56		sleep(1);
57		printf("IP     src.port -> dst.port               bytes      packets\n");
58		while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
59			bpf_map_lookup_elem(map_fd[2], &next_key, &value);
60			printf("%s.%05d -> %s.%05d %12lld %12lld\n",
61			       inet_ntoa((struct in_addr){htonl(next_key.src)}),
62			       next_key.port16[0],
63			       inet_ntoa((struct in_addr){htonl(next_key.dst)}),
64			       next_key.port16[1],
65			       value.bytes, value.packets);
66			key = next_key;
67		}
68	}
69	return 0;
70}