// SPDX-License-Identifier: GPL-2.0-only#include <linux/kernel.h>#include <linux/module.h>#include <linux/netdevice.h> #include "notifier-error-inject.h" static int priority;module_param(priority, int, 0);MODULE_PARM_DESC(priority, "specify netdevice notifier priority"); static struct notifier_err_inject netdev_notifier_err_inject = {	.actions = {		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_REGISTER) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGEMTU) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGENAME) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_UP) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_TYPE_CHANGE) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_POST_INIT) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEMTU) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEUPPER) },		{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGEUPPER) },		{}	}}; static struct dentry *dir; static int netdev_err_inject_init(void){	int err; 	dir = notifier_err_inject_init("netdev", notifier_err_inject_dir,				       &netdev_notifier_err_inject, priority);	if (IS_ERR(dir))		return PTR_ERR(dir); 	err = register_netdevice_notifier(&netdev_notifier_err_inject.nb);	if (err)		debugfs_remove_recursive(dir); 	return err;} static void netdev_err_inject_exit(void){	unregister_netdevice_notifier(&netdev_notifier_err_inject.nb);	debugfs_remove_recursive(dir);} module_init(netdev_err_inject_init);module_exit(netdev_err_inject_exit); MODULE_DESCRIPTION("Netdevice notifier error injection module");MODULE_LICENSE("GPL");MODULE_AUTHOR("Nikolay Aleksandrov <razor@blackwall.org>");