tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12struct pair {
13 __u64 packets;
14 __u64 bytes;
15};
16
17int main(int ac, char **argv)
18{
19 struct bpf_object *obj;
20 int map_fd, prog_fd;
21 char filename[256];
22 int i, sock;
23 FILE *f;
24
25 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
26
27 if (bpf_prog_load(filename, BPF_PROG_TYPE_SOCKET_FILTER,
28 &obj, &prog_fd))
29 return 1;
30
31 map_fd = bpf_object__find_map_fd_by_name(obj, "hash_map");
32
33 sock = open_raw_sock("lo");
34
35 assert(setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
36 sizeof(prog_fd)) == 0);
37
38 f = popen("ping -4 -c5 localhost", "r");
39 (void) f;
40
41 for (i = 0; i < 5; i++) {
42 int key = 0, next_key;
43 struct pair value;
44
45 while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
46 bpf_map_lookup_elem(map_fd, &next_key, &value);
47 printf("ip %s bytes %lld packets %lld\n",
48 inet_ntoa((struct in_addr){htonl(next_key)}),
49 value.bytes, value.packets);
50 key = next_key;
51 }
52 sleep(1);
53 }
54 return 0;
55}