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(buf: filename, size: sizeof(filename), fmt: "%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(name: "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

source code of linux/samples/bpf/sockex3_user.c