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/libbpf.h>
7 #include "sock_example.h"
8 #include <unistd.h>
9 #include <arpa/inet.h>
10 #include <sys/resource.h>
11
12 struct pair {
13 __u64 packets;
14 __u64 bytes;
15 };
16
main(int ac,char ** argv)17 int main(int ac, char **argv)
18 {
19 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
20 struct bpf_object *obj;
21 int map_fd, prog_fd;
22 char filename[256];
23 int i, sock;
24 FILE *f;
25
26 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
27 setrlimit(RLIMIT_MEMLOCK, &r);
28
29 if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
30 &obj, &prog_fd))
31 return 1;
32
33 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
34
35 sock = open_raw_sock("lo");
36
37 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
38 sizeof(prog_fd)) == 0);
39
40 f = popen("ping -4 -c5 localhost", "r");
41 (void) f;
42
43 for (i = 0; i < 5; i++) {
44 int key = 0, next_key;
45 struct pair value;
46
47 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
48 bpf_map_lookup_elem(map_fd, &next_key, &value);
49 printf("ip %s bytes %lld packets %lld\n",
50 inet_ntoa((struct in_addr){htonl(next_key)}),
51 value.bytes, value.packets);
52 key = next_key;
53 }
54 sleep(1);
55 }
56 return 0;
57 }
58