Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#define _GNU_SOURCE
3#include <sys/uio.h>
4#include <errno.h>
5#include <stdio.h>
6#include <sys/socket.h>
7#include <fcntl.h>
8#include <unistd.h>
9#include "include/uapi/linux/bpf.h"
10#include <asm/unistd.h>
11#include "msgfmt.h"
12
13int debug_fd;
14
15static int handle_get_cmd(struct mbox_request *cmd)
16{
17 switch (cmd->cmd) {
18 case 0:
19 return 0;
20 default:
21 break;
22 }
23 return -ENOPROTOOPT;
24}
25
26static int handle_set_cmd(struct mbox_request *cmd)
27{
28 return -ENOPROTOOPT;
29}
30
31static void loop(void)
32{
33 while (1) {
34 struct mbox_request req;
35 struct mbox_reply reply;
36 int n;
37
38 n = read(0, &req, sizeof(req));
39 if (n != sizeof(req)) {
40 dprintf(debug_fd, "invalid request %d\n", n);
41 return;
42 }
43
44 reply.status = req.is_set ?
45 handle_set_cmd(&req) :
46 handle_get_cmd(&req);
47
48 n = write(1, &reply, sizeof(reply));
49 if (n != sizeof(reply)) {
50 dprintf(debug_fd, "reply failed %d\n", n);
51 return;
52 }
53 }
54}
55
56int main(void)
57{
58 debug_fd = open("/dev/console", 00000002);
59 dprintf(debug_fd, "Started bpfilter\n");
60 loop();
61 close(debug_fd);
62 return 0;
63}