1// SPDX-License-Identifier: GPL-2.0
 2#include <stdio.h>
 3#include <assert.h>
 4#include <linux/bpf.h>
 5#include "libbpf.h"
 6#include "bpf_load.h"
 7#include "sock_example.h"
 8#include <unistd.h>
 9#include <arpa/inet.h>
10#include <sys/resource.h>
11
12#define PARSE_IP 3
13#define PARSE_IP_PROG_FD (prog_fd[0])
14#define PROG_ARRAY_FD (map_fd[0])
15
16struct bpf_flow_keys {
17	__be32 src;
18	__be32 dst;
19	union {
20		__be32 ports;
21		__be16 port16[2];
22	};
23	__u32 ip_proto;
24};
25
26struct pair {
27	__u64 packets;
28	__u64 bytes;
29};
30
31int main(int argc, char **argv)
32{
33	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
34	char filename[256];
35	FILE *f;
36	int i, sock, err, id, key = PARSE_IP;
37	struct bpf_prog_info info = {};
38	uint32_t info_len = sizeof(info);
39
40	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
41	setrlimit(RLIMIT_MEMLOCK, &r);
42
43	if (load_bpf_file(filename)) {
44		printf("%s", bpf_log_buf);
45		return 1;
46	}
47
48	/* Test fd array lookup which returns the id of the bpf_prog */
49	err = bpf_obj_get_info_by_fd(PARSE_IP_PROG_FD, &info, &info_len);
50	assert(!err);
51	err = bpf_map_lookup_elem(PROG_ARRAY_FD, &key, &id);
52	assert(!err);
53	assert(id == info.id);
54
55	sock = open_raw_sock("lo");
56
57	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd[4],
58			  sizeof(__u32)) == 0);
59
60	if (argc > 1)
61		f = popen("ping -c5 localhost", "r");
62	else
63		f = popen("netperf -l 4 localhost", "r");
64	(void) f;
65
66	for (i = 0; i < 5; i++) {
67		struct bpf_flow_keys key = {}, next_key;
68		struct pair value;
69
70		sleep(1);
71		printf("IP     src.port -> dst.port               bytes      packets\n");
72		while (bpf_map_get_next_key(map_fd[2], &key, &next_key) == 0) {
73			bpf_map_lookup_elem(map_fd[2], &next_key, &value);
74			printf("%s.%05d -> %s.%05d %12lld %12lld\n",
75			       inet_ntoa((struct in_addr){htonl(next_key.src)}),
76			       next_key.port16[0],
77			       inet_ntoa((struct in_addr){htonl(next_key.dst)}),
78			       next_key.port16[1],
79			       value.bytes, value.packets);
80			key = next_key;
81		}
82	}
83	return 0;
84}