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