lib/netdev-notifier-error-inject.c

   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>");