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 int bpfilter_mbox_request(struct sock *sk, int optname, sockptr_t optval,
16 unsigned int optlen, bool is_set)
19 mutex_lock(&bpfilter_ops.lock);
20 if (!bpfilter_ops.sockopt) {
21 mutex_unlock(&bpfilter_ops.lock);
22 request_module("bpfilter");
23 mutex_lock(&bpfilter_ops.lock);
25 if (!bpfilter_ops.sockopt) {
30 if (bpfilter_ops.info.tgid &&
31 thread_group_exited(bpfilter_ops.info.tgid))
32 umd_cleanup_helper(&bpfilter_ops.info);
34 if (!bpfilter_ops.info.tgid) {
35 err = bpfilter_ops.start();
39 err = bpfilter_ops.sockopt(sk, optname, optval, optlen, is_set);
41 mutex_unlock(&bpfilter_ops.lock);
45 int bpfilter_ip_set_sockopt(struct sock *sk, int optname, sockptr_t optval,
48 return bpfilter_mbox_request(sk, optname, optval, optlen, true);
51 int bpfilter_ip_get_sockopt(struct sock *sk, int optname, char __user *optval,
56 if (get_user(len, optlen))
59 return bpfilter_mbox_request(sk, optname, USER_SOCKPTR(optval), len,
63 static int __init bpfilter_sockopt_init(void)
65 mutex_init(&bpfilter_ops.lock);
66 bpfilter_ops.info.tgid = NULL;
67 bpfilter_ops.info.driver_name = "bpfilter_umh";
71 device_initcall(bpfilter_sockopt_init);