lib/netdev-notifier-error-inject.c

   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>");