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                 {}
  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 <razor@blackwall.org>");