1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/kernel.h>
3#include <linux/module.h>
4#include <linux/netdevice.h>
5
6#include "notifier-error-inject.h"
7
8static int priority;
9module_param(priority, int, 0);
10MODULE_PARM_DESC(priority, "specify netdevice notifier priority");
11
12static struct notifier_err_inject netdev_notifier_err_inject = {
13	.actions = {
14		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_REGISTER) },
15		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGEMTU) },
16		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGENAME) },
17		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_UP) },
18		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_TYPE_CHANGE) },
19		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_POST_INIT) },
20		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEMTU) },
21		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEUPPER) },
22		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGEUPPER) },
23		{}
24	}
25};
26
27static struct dentry *dir;
28
29static int netdev_err_inject_init(void)
30{
31	int err;
32
33	dir = notifier_err_inject_init("netdev", notifier_err_inject_dir,
34				       &netdev_notifier_err_inject, priority);
35	if (IS_ERR(dir))
36		return PTR_ERR(dir);
37
38	err = register_netdevice_notifier(&netdev_notifier_err_inject.nb);
39	if (err)
40		debugfs_remove_recursive(dir);
41
42	return err;
43}
44
45static void netdev_err_inject_exit(void)
46{
47	unregister_netdevice_notifier(&netdev_notifier_err_inject.nb);
48	debugfs_remove_recursive(dir);
49}
50
51module_init(netdev_err_inject_init);
52module_exit(netdev_err_inject_exit);
53
54MODULE_DESCRIPTION("Netdevice notifier error injection module");
55MODULE_LICENSE("GPL");
56MODULE_AUTHOR("Nikolay Aleksandrov <razor@blackwall.org>");
57