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 | |
10 | struct 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 | |
20 | struct pair { |
21 | __u64 packets; |
22 | __u64 bytes; |
23 | }; |
24 | |
25 | int 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(s: filename, maxlen: sizeof(filename), format: "%s_kern.o" , argv[0]); |
34 | |
35 | obj = bpf_object__open_file(filename, NULL); |
36 | if (libbpf_get_error(obj)) { |
37 | fprintf(stderr, format: "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, format: "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, format: "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(s1: bpf_program__name(prog), s2: "main_prog" )) |
59 | main_prog_fd = fd; |
60 | } |
61 | |
62 | if (main_prog_fd == 0) { |
63 | fprintf(stderr, format: "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(command: "ping -4 -c5 localhost" , modes: "r" ); |
75 | else |
76 | f = popen(command: "netperf -l 4 localhost" , modes: "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(seconds: 1); |
84 | printf(format: "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(format: "%s.%05d -> %s.%05d %12lld %12lld\n" , |
88 | inet_ntoa(in: (struct in_addr){htonl(next_key.src)}), |
89 | next_key.port16[0], |
90 | inet_ntoa(in: (struct in_addr){htonl(next_key.dst)}), |
91 | next_key.port16[1], |
92 | value.bytes, value.packets); |
93 | key = next_key; |
94 | } |
95 | } |
96 | |
97 | cleanup: |
98 | bpf_object__close(obj); |
99 | return 0; |
100 | } |
101 | |