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 
8 static int priority;
9 module_param(priority, int, 0);
10 MODULE_PARM_DESC(priority, "specify netdevice notifier priority");
11 
12 static 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 
27 static struct dentry *dir;
28 
29 static 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 
45 static void netdev_err_inject_exit(void)
46 {
47 	unregister_netdevice_notifier(&netdev_notifier_err_inject.nb);
48 	debugfs_remove_recursive(dir);
49 }
50 
51 module_init(netdev_err_inject_init);
52 module_exit(netdev_err_inject_exit);
53 
54 MODULE_DESCRIPTION("Netdevice notifier error injection module");
55 MODULE_LICENSE("GPL");
56 MODULE_AUTHOR("Nikolay Aleksandrov <razor@blackwall.org>");
57