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 		{}
22 	}
23 };
24 
25 static struct dentry *dir;
26 
27 static int netdev_err_inject_init(void)
28 {
29 	int err;
30 
31 	dir = notifier_err_inject_init("netdev", notifier_err_inject_dir,
32 				       &netdev_notifier_err_inject, priority);
33 	if (IS_ERR(dir))
34 		return PTR_ERR(dir);
35 
36 	err = register_netdevice_notifier(&netdev_notifier_err_inject.nb);
37 	if (err)
38 		debugfs_remove_recursive(dir);
39 
40 	return err;
41 }
42 
43 static void netdev_err_inject_exit(void)
44 {
45 	unregister_netdevice_notifier(&netdev_notifier_err_inject.nb);
46 	debugfs_remove_recursive(dir);
47 }
48 
49 module_init(netdev_err_inject_init);
50 module_exit(netdev_err_inject_exit);
51 
52 MODULE_DESCRIPTION("Netdevice notifier error injection module");
53 MODULE_LICENSE("GPL");
54 MODULE_AUTHOR("Nikolay Aleksandrov <[email protected]>");
55