xref: /linux/samples/bpf/sockex3_user.c (revision 37744feebc086908fd89760650f458ab19071750)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <stdio.h>
3 #include <assert.h>
4 #include <linux/bpf.h>
5 #include <bpf/bpf.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 
16 struct flow_key_record {
17 	__be32 src;
18 	__be32 dst;
19 	union {
20 		__be32 ports;
21 		__be16 port16[2];
22 	};
23 	__u32 ip_proto;
24 };
25 
26 struct pair {
27 	__u64 packets;
28 	__u64 bytes;
29 };
30 
31 int 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 -4 -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 flow_key_record 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 }
85