1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/init.h>
3 #include <linux/module.h>
4 #include <linux/uaccess.h>
5 #include <linux/bpfilter.h>
6 #include <uapi/linux/bpf.h>
7 #include <linux/wait.h>
8 #include <linux/kmod.h>
10 #include <linux/file.h>
12 struct bpfilter_umh_ops bpfilter_ops;
13 EXPORT_SYMBOL_GPL(bpfilter_ops);
15 static void bpfilter_umh_cleanup(struct umh_info *info)
17 mutex_lock(&bpfilter_ops.lock);
18 bpfilter_ops.stop = true;
19 fput(info->pipe_to_umh);
20 fput(info->pipe_from_umh);
22 mutex_unlock(&bpfilter_ops.lock);
25 static int bpfilter_mbox_request(struct sock *sk, int optname,
27 unsigned int optlen, bool is_set)
30 mutex_lock(&bpfilter_ops.lock);
31 if (!bpfilter_ops.sockopt) {
32 mutex_unlock(&bpfilter_ops.lock);
33 err = request_module("bpfilter");
34 mutex_lock(&bpfilter_ops.lock);
38 if (!bpfilter_ops.sockopt) {
43 if (bpfilter_ops.stop) {
44 err = bpfilter_ops.start();
48 err = bpfilter_ops.sockopt(sk, optname, optval, optlen, is_set);
50 mutex_unlock(&bpfilter_ops.lock);
54 int bpfilter_ip_set_sockopt(struct sock *sk, int optname, char __user *optval,
57 return bpfilter_mbox_request(sk, optname, optval, optlen, true);
60 int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
65 if (get_user(len, optlen))
68 return bpfilter_mbox_request(sk, optname, optval, len, false);
71 static int __init bpfilter_sockopt_init(void)
73 mutex_init(&bpfilter_ops.lock);
74 bpfilter_ops.stop = true;
75 bpfilter_ops.info.cmdline = "bpfilter_umh";
76 bpfilter_ops.info.cleanup = &bpfilter_umh_cleanup;
81 module_init(bpfilter_sockopt_init);