1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <assert.h>
4#include <bpf/bpf.h>
5#include <bpf/libbpf.h>
6#include "sock_example.h"
7#include <unistd.h>
8#include <arpa/inet.h>
9
10struct flow_key_record {
11	__be32 src;
12	__be32 dst;
13	union {
14		__be32 ports;
15		__be16 port16[2];
16	};
17	__u32 ip_proto;
18};
19
20struct pair {
21	__u64 packets;
22	__u64 bytes;
23};
24
25int main(int argc, char **argv)
26{
27	int i, sock, fd, main_prog_fd, hash_map_fd;
28	struct bpf_program *prog;
29	struct bpf_object *obj;
30	char filename[256];
31	FILE *f;
32
33	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
34
35	obj = bpf_object__open_file(filename, NULL);
36	if (libbpf_get_error(obj)) {
37		fprintf(stderr, "ERROR: opening BPF object file failed\n");
38		return 0;
39	}
40
41	/* load BPF program */
42	if (bpf_object__load(obj)) {
43		fprintf(stderr, "ERROR: loading BPF object file failed\n");
44		goto cleanup;
45	}
46
47	hash_map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
48	if (hash_map_fd < 0) {
49		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
50		goto cleanup;
51	}
52
53	/* find BPF main program */
54	main_prog_fd = 0;
55	bpf_object__for_each_program(prog, obj) {
56		fd = bpf_program__fd(prog);
57
58		if (!strcmp(bpf_program__name(prog), "main_prog"))
59			main_prog_fd = fd;
60	}
61
62	if (main_prog_fd == 0) {
63		fprintf(stderr, "ERROR: can't find main_prog\n");
64		goto cleanup;
65	}
66
67	sock = open_raw_sock("lo");
68
69	/* attach BPF program to socket */
70	assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &main_prog_fd,
71			  sizeof(__u32)) == 0);
72
73	if (argc > 1)
74		f = popen("ping -4 -c5 localhost", "r");
75	else
76		f = popen("netperf -l 4 localhost", "r");
77	(void) f;
78
79	for (i = 0; i < 5; i++) {
80		struct flow_key_record key = {}, next_key;
81		struct pair value;
82
83		sleep(1);
84		printf("IP     src.port -> dst.port               bytes      packets\n");
85		while (bpf_map_get_next_key(hash_map_fd, &key, &next_key) == 0) {
86			bpf_map_lookup_elem(hash_map_fd, &next_key, &value);
87			printf("%s.%05d -> %s.%05d %12lld %12lld\n",
88			       inet_ntoa((struct in_addr){htonl(next_key.src)}),
89			       next_key.port16[0],
90			       inet_ntoa((struct in_addr){htonl(next_key.dst)}),
91			       next_key.port16[1],
92			       value.bytes, value.packets);
93			key = next_key;
94		}
95	}
96
97cleanup:
98	bpf_object__close(obj);
99	return 0;
100}
101