net/netfilter/xt_HARDIDLETIMER.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/net/netfilter/xt_HARDIDLETIMER.c
  *
  * Netfilter module to trigger a timer when packet matches.
  * After timer expires a kevent will be sent.
  *
  * Copyright (c) 2014-2015, 2017 The Linux Foundation. All rights reserved.
  *
  * Copyright (C) 2004, 2010 Nokia Corporation
  *
  * Written by Timo Teras <ext-timo.teras@nokia.com>
  *
  * Converted to x_tables and reworked for upstream inclusion
  * by Luciano Coelho <luciano.coelho@nokia.com>
  *
  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/timer.h>
 #include <linux/alarmtimer.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_HARDIDLETIMER.h>
 #include <linux/kdev_t.h>
 #include <linux/kobject.h>
 #include <linux/skbuff.h>
 #include <linux/workqueue.h>
 #include <linux/sysfs.h>
 #include <net/net_namespace.h>

 struct hardidletimer_tg_attr {
 	struct attribute attr;
 	ssize_t	(*show)(struct kobject *kobj,
 			struct attribute *attr, char *buf);
 };

 struct hardidletimer_tg {
 	struct list_head entry;
 	struct alarm alarm;
 	struct work_struct work;

 	struct kobject *kobj;
 	struct hardidletimer_tg_attr attr;

 	unsigned int refcnt;
 	bool send_nl_msg;
 	bool active;
 };

 static LIST_HEAD(hardidletimer_tg_list);
 static DEFINE_MUTEX(list_mutex);

 static struct kobject *hardidletimer_tg_kobj;

 static void notify_netlink_uevent(const char *iface,
 				  struct hardidletimer_tg *timer)
 {
 	char iface_msg[NLMSG_MAX_SIZE];
 	char state_msg[NLMSG_MAX_SIZE];
 	char *envp[] = { iface_msg, state_msg, NULL };
 	int res;

 	res = snprintf(iface_msg, NLMSG_MAX_SIZE, "INTERFACE=%s",
 		       iface);
 	if (res >= NLMSG_MAX_SIZE) {
 		pr_err("message too long (%d)", res);
 		return;
 	}
 	res = snprintf(state_msg, NLMSG_MAX_SIZE, "STATE=%s",
 		       timer->active ? "active" : "inactive");
 	if (res >= NLMSG_MAX_SIZE) {
 		pr_err("message too long (%d)", res);
 		return;
 	}
 	pr_debug("putting nlmsg: <%s> <%s>\n", iface_msg, state_msg);
 	kobject_uevent_env(hardidletimer_tg_kobj, KOBJ_CHANGE, envp);
 }

 static
 struct hardidletimer_tg *__hardidletimer_tg_find_by_label(const char *label)
 {
 	struct hardidletimer_tg *entry;

 	WARN_ON(!label);

 	list_for_each_entry(entry, &hardidletimer_tg_list, entry) {
 		if (!strcmp(label, entry->attr.attr.name))
 			return entry;
 	}

 	return NULL;
 }

 static ssize_t hardidletimer_tg_show(struct kobject *kobj,
 				     struct attribute *attr, char *buf)
 {
 	struct hardidletimer_tg *timer;
 	ktime_t expires;
 	struct timespec ktimespec;

 	memset(&ktimespec, 0, sizeof(struct timespec));
 	mutex_lock(&list_mutex);

 	timer =	__hardidletimer_tg_find_by_label(attr->name);
 	if (timer) {
 		expires = alarm_expires_remaining(&timer->alarm);
 		ktimespec = ktime_to_timespec(expires);
 	}

 	mutex_unlock(&list_mutex);

 	if (ktimespec.tv_sec >= 0)
 		return snprintf(buf, PAGE_SIZE, "%ld\n", ktimespec.tv_sec);

 	if ((timer) && (timer->send_nl_msg))
 		return snprintf(buf, PAGE_SIZE, "0 %ld\n", ktimespec.tv_sec);
 	else
 		return snprintf(buf, PAGE_SIZE, "0\n");
 }

 static void hardidletimer_tg_work(struct work_struct *work)
 {
 	struct hardidletimer_tg *timer = container_of(work,
 				struct hardidletimer_tg, work);

 	sysfs_notify(hardidletimer_tg_kobj, NULL, timer->attr.attr.name);

 	if (timer->send_nl_msg)
 		notify_netlink_uevent(timer->attr.attr.name, timer);
 }

 static enum alarmtimer_restart hardidletimer_tg_alarmproc(struct alarm *alarm,
 							  ktime_t now)
 {
 	struct hardidletimer_tg *timer = alarm->data;

 	pr_debug("alarm %s expired\n", timer->attr.attr.name);

 	timer->active = false;
 	schedule_work(&timer->work);
 	return ALARMTIMER_NORESTART;
 }

 static int hardidletimer_tg_create(struct hardidletimer_tg_info *info)
 {
 	int ret;
 	ktime_t tout;

 	info->timer = kmalloc(sizeof(*info->timer), GFP_KERNEL);
 	if (!info->timer) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL);
 	if (!info->timer->attr.attr.name) {
 		ret = -ENOMEM;
 		goto out_free_timer;
 	}
 	info->timer->attr.attr.mode = 0444;
 	info->timer->attr.show = hardidletimer_tg_show;

 	ret = sysfs_create_file(hardidletimer_tg_kobj, &info->timer->attr.attr);
 	if (ret < 0) {
 		pr_debug("couldn't add file to sysfs");
 		goto out_free_attr;
 	}
 	/*  notify userspace  */
 	kobject_uevent(hardidletimer_tg_kobj, KOBJ_ADD);

 	list_add(&info->timer->entry, &hardidletimer_tg_list);

 	alarm_init(&info->timer->alarm, ALARM_BOOTTIME,
 		   hardidletimer_tg_alarmproc);
 	info->timer->alarm.data = info->timer;
 	info->timer->refcnt = 1;
 	info->timer->send_nl_msg = (info->send_nl_msg == 0) ? false : true;
 	info->timer->active = true;
 	tout = ktime_set(info->timeout, 0);
 	alarm_start_relative(&info->timer->alarm, tout);

 	INIT_WORK(&info->timer->work, hardidletimer_tg_work);

 	return 0;

 out_free_attr:
 	kfree(info->timer->attr.attr.name);
 out_free_timer:
 	kfree(info->timer);
 out:
 	return ret;
 }

 /* The actual xt_tables plugin. */
 static unsigned int hardidletimer_tg_target(struct sk_buff *skb,
 					    const struct xt_action_param *par)
 {
 	const struct hardidletimer_tg_info *info = par->targinfo;
 	ktime_t tout;

 	pr_debug("resetting timer %s, timeout period %u\n",
 		 info->label, info->timeout);

 	WARN_ON(!info->timer);

 	if (!info->timer->active) {
 		schedule_work(&info->timer->work);
 		pr_debug("Starting timer %s\n", info->label);
 	}

 	info->timer->active = true;
 	/* TODO: Avoid modifying timers on each packet */
 	tout = ktime_set(info->timeout, 0);
 	alarm_start_relative(&info->timer->alarm, tout);

 	return XT_CONTINUE;
 }

 static int hardidletimer_tg_checkentry(const struct xt_tgchk_param *par)
 {
 	struct hardidletimer_tg_info *info = par->targinfo;
 	int ret;
 	ktime_t tout;
 	struct timespec ktimespec;

 	memset(&ktimespec, 0, sizeof(struct timespec));

 	pr_debug("checkentry targinfo %s\n", info->label);

 	if (info->timeout == 0) {
 		pr_debug("timeout value is zero\n");
 		return -EINVAL;
 	}

 	if (info->label[0] == '\0' ||
 	    strnlen(info->label, MAX_HARDIDLETIMER_LABEL_SIZE)
 				== MAX_HARDIDLETIMER_LABEL_SIZE) {
 		pr_debug("label is empty or not nul-terminated\n");
 		return -EINVAL;
 	}

 	mutex_lock(&list_mutex);

 	info->timer = __hardidletimer_tg_find_by_label(info->label);
 	if (info->timer) {
 		info->timer->refcnt++;
 		/* calculate remaining expiry time */
 		tout = alarm_expires_remaining(&info->timer->alarm);
 		ktimespec = ktime_to_timespec(tout);

 		if (ktimespec.tv_sec > 0) {
 			pr_debug("time_expiry_remaining %ld\n",
 				 ktimespec.tv_sec);
 			alarm_start_relative(&info->timer->alarm, tout);
 		}

 		pr_debug("increased refcnt of timer %s to %u\n",
 			 info->label, info->timer->refcnt);
 	} else {
 		ret = hardidletimer_tg_create(info);
 		if (ret < 0) {
 			pr_debug("failed to create timer\n");
 			mutex_unlock(&list_mutex);
 			return ret;
 		}
 	}

 	mutex_unlock(&list_mutex);

 	return 0;
 }

 static void hardidletimer_tg_destroy(const struct xt_tgdtor_param *par)
 {
 	const struct hardidletimer_tg_info *info = par->targinfo;

 	pr_debug("destroy targinfo %s\n", info->label);

 	mutex_lock(&list_mutex);

 	if (--info->timer->refcnt == 0) {
 		pr_debug("deleting timer %s\n", info->label);

 		list_del(&info->timer->entry);
 		alarm_cancel(&info->timer->alarm);
 		cancel_work_sync(&info->timer->work);
 		sysfs_remove_file(hardidletimer_tg_kobj,
 				  &info->timer->attr.attr);
 		kfree(info->timer->attr.attr.name);
 		kfree(info->timer);
 	} else {
 		pr_debug("decreased refcnt of timer %s to %u\n",
 			 info->label, info->timer->refcnt);
 	}

 	mutex_unlock(&list_mutex);
 }

 static struct xt_target hardidletimer_tg __read_mostly = {
 	.name		= "HARDIDLETIMER",
 	.revision	= 1,
 	.family		= NFPROTO_UNSPEC,
 	.target		= hardidletimer_tg_target,
 	.targetsize     = sizeof(struct hardidletimer_tg_info),
 	.checkentry	= hardidletimer_tg_checkentry,
 	.destroy        = hardidletimer_tg_destroy,
 	.me		= THIS_MODULE,
 };

 static struct class *hardidletimer_tg_class;

 static struct device *hardidletimer_tg_device;

 static int __init hardidletimer_tg_init(void)
 {
 	int err;

 	hardidletimer_tg_class = class_create(THIS_MODULE, "xt_hardidletimer");
 	err = PTR_ERR(hardidletimer_tg_class);
 	if (IS_ERR(hardidletimer_tg_class)) {
 		pr_debug("couldn't register device class\n");
 		goto out;
 	}

 	hardidletimer_tg_device = device_create(hardidletimer_tg_class, NULL,
 						MKDEV(0, 0), NULL, "timers");
 	err = PTR_ERR(hardidletimer_tg_device);
 	if (IS_ERR(hardidletimer_tg_device)) {
 		pr_debug("couldn't register system device\n");
 		goto out_class;
 	}

 	hardidletimer_tg_kobj = &hardidletimer_tg_device->kobj;

 	err = xt_register_target(&hardidletimer_tg);
 	if (err < 0) {
 		pr_debug("couldn't register xt target\n");
 		goto out_dev;
 	}

 	return 0;
 out_dev:
 	device_destroy(hardidletimer_tg_class, MKDEV(0, 0));
 out_class:
 	class_destroy(hardidletimer_tg_class);
 out:
 	return err;
 }

 static void __exit hardidletimer_tg_exit(void)
 {
 	xt_unregister_target(&hardidletimer_tg);

 	device_destroy(hardidletimer_tg_class, MKDEV(0, 0));
 	class_destroy(hardidletimer_tg_class);
 }

 module_init(hardidletimer_tg_init);
 module_exit(hardidletimer_tg_exit);

 MODULE_AUTHOR("Timo Teras <ext-timo.teras@nokia.com>");
 MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
 MODULE_DESCRIPTION("Xtables: idle time monitor");
 MODULE_LICENSE("GPL v2");
	/*
	* linux/net/netfilter/xt_HARDIDLETIMER.c
	*
	* Netfilter module to trigger a timer when packet matches.
	* After timer expires a kevent will be sent.
	*
	* Copyright (c) 2014-2015, 2017 The Linux Foundation. All rights reserved.
	*
	* Copyright (C) 2004, 2010 Nokia Corporation
	*
	* Written by Timo Teras <ext-timo.teras@nokia.com>
	*
	* Converted to x_tables and reworked for upstream inclusion
	* by Luciano Coelho <luciano.coelho@nokia.com>
	*
	* Contact: Luciano Coelho <luciano.coelho@nokia.com>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/timer.h>
	#include <linux/alarmtimer.h>
	#include <linux/list.h>
	#include <linux/mutex.h>
	#include <linux/netfilter.h>
	#include <linux/netfilter/x_tables.h>
	#include <linux/netfilter/xt_HARDIDLETIMER.h>
	#include <linux/kdev_t.h>
	#include <linux/kobject.h>
	#include <linux/skbuff.h>
	#include <linux/workqueue.h>
	#include <linux/sysfs.h>
	#include <net/net_namespace.h>

	struct hardidletimer_tg_attr {
	struct attribute attr;
	ssize_t (show)(struct kobject kobj,
	struct attribute attr, char buf);
	};

	struct hardidletimer_tg {
	struct list_head entry;
	struct alarm alarm;
	struct work_struct work;

	struct kobject *kobj;
	struct hardidletimer_tg_attr attr;

	unsigned int refcnt;
	bool send_nl_msg;
	bool active;
	};

	static LIST_HEAD(hardidletimer_tg_list);
	static DEFINE_MUTEX(list_mutex);

	static struct kobject *hardidletimer_tg_kobj;

	static void notify_netlink_uevent(const char *iface,
	struct hardidletimer_tg *timer)
	{
	char iface_msg[NLMSG_MAX_SIZE];
	char state_msg[NLMSG_MAX_SIZE];
	char *envp[] = { iface_msg, state_msg, NULL };
	int res;

	res = snprintf(iface_msg, NLMSG_MAX_SIZE, "INTERFACE=%s",
	iface);
	if (res >= NLMSG_MAX_SIZE) {
	pr_err("message too long (%d)", res);
	return;
	}
	res = snprintf(state_msg, NLMSG_MAX_SIZE, "STATE=%s",
	timer->active ? "active" : "inactive");
	if (res >= NLMSG_MAX_SIZE) {
	pr_err("message too long (%d)", res);
	return;
	}
	pr_debug("putting nlmsg: <%s> <%s>\n", iface_msg, state_msg);
	kobject_uevent_env(hardidletimer_tg_kobj, KOBJ_CHANGE, envp);
	}

	static
	struct hardidletimer_tg __hardidletimer_tg_find_by_label(const char label)
	{
	struct hardidletimer_tg *entry;

	WARN_ON(!label);

	list_for_each_entry(entry, &hardidletimer_tg_list, entry) {
	if (!strcmp(label, entry->attr.attr.name))
	return entry;
	}

	return NULL;
	}

	static ssize_t hardidletimer_tg_show(struct kobject *kobj,
	struct attribute attr, char buf)
	{
	struct hardidletimer_tg *timer;
	ktime_t expires;
	struct timespec ktimespec;

	memset(&ktimespec, 0, sizeof(struct timespec));
	mutex_lock(&list_mutex);

	timer = __hardidletimer_tg_find_by_label(attr->name);
	if (timer) {
	expires = alarm_expires_remaining(&timer->alarm);
	ktimespec = ktime_to_timespec(expires);
	}

	mutex_unlock(&list_mutex);

	if (ktimespec.tv_sec >= 0)
	return snprintf(buf, PAGE_SIZE, "%ld\n", ktimespec.tv_sec);

	if ((timer) && (timer->send_nl_msg))
	return snprintf(buf, PAGE_SIZE, "0 %ld\n", ktimespec.tv_sec);
	else
	return snprintf(buf, PAGE_SIZE, "0\n");
	}

	static void hardidletimer_tg_work(struct work_struct *work)
	{
	struct hardidletimer_tg *timer = container_of(work,
	struct hardidletimer_tg, work);

	sysfs_notify(hardidletimer_tg_kobj, NULL, timer->attr.attr.name);

	if (timer->send_nl_msg)
	notify_netlink_uevent(timer->attr.attr.name, timer);
	}

	static enum alarmtimer_restart hardidletimer_tg_alarmproc(struct alarm *alarm,
	ktime_t now)
	{
	struct hardidletimer_tg *timer = alarm->data;

	pr_debug("alarm %s expired\n", timer->attr.attr.name);

	timer->active = false;
	schedule_work(&timer->work);
	return ALARMTIMER_NORESTART;
	}

	static int hardidletimer_tg_create(struct hardidletimer_tg_info *info)
	{
	int ret;
	ktime_t tout;

	info->timer = kmalloc(sizeof(*info->timer), GFP_KERNEL);
	if (!info->timer) {
	ret = -ENOMEM;
	goto out;
	}

	info->timer->attr.attr.name = kstrdup(info->label, GFP_KERNEL);
	if (!info->timer->attr.attr.name) {
	ret = -ENOMEM;
	goto out_free_timer;
	}
	info->timer->attr.attr.mode = 0444;
	info->timer->attr.show = hardidletimer_tg_show;

	ret = sysfs_create_file(hardidletimer_tg_kobj, &info->timer->attr.attr);
	if (ret < 0) {
	pr_debug("couldn't add file to sysfs");
	goto out_free_attr;
	}
	/* notify userspace */
	kobject_uevent(hardidletimer_tg_kobj, KOBJ_ADD);

	list_add(&info->timer->entry, &hardidletimer_tg_list);

	alarm_init(&info->timer->alarm, ALARM_BOOTTIME,
	hardidletimer_tg_alarmproc);
	info->timer->alarm.data = info->timer;
	info->timer->refcnt = 1;
	info->timer->send_nl_msg = (info->send_nl_msg == 0) ? false : true;
	info->timer->active = true;
	tout = ktime_set(info->timeout, 0);
	alarm_start_relative(&info->timer->alarm, tout);

	INIT_WORK(&info->timer->work, hardidletimer_tg_work);

	return 0;

	out_free_attr:
	kfree(info->timer->attr.attr.name);
	out_free_timer:
	kfree(info->timer);
	out:
	return ret;
	}

	/* The actual xt_tables plugin. */
	static unsigned int hardidletimer_tg_target(struct sk_buff *skb,
	const struct xt_action_param *par)
	{
	const struct hardidletimer_tg_info *info = par->targinfo;
	ktime_t tout;

	pr_debug("resetting timer %s, timeout period %u\n",
	info->label, info->timeout);

	WARN_ON(!info->timer);

	if (!info->timer->active) {
	schedule_work(&info->timer->work);
	pr_debug("Starting timer %s\n", info->label);
	}

	info->timer->active = true;
	/* TODO: Avoid modifying timers on each packet */
	tout = ktime_set(info->timeout, 0);
	alarm_start_relative(&info->timer->alarm, tout);

	return XT_CONTINUE;
	}

	static int hardidletimer_tg_checkentry(const struct xt_tgchk_param *par)
	{
	struct hardidletimer_tg_info *info = par->targinfo;
	int ret;
	ktime_t tout;
	struct timespec ktimespec;

	memset(&ktimespec, 0, sizeof(struct timespec));

	pr_debug("checkentry targinfo %s\n", info->label);

	if (info->timeout == 0) {
	pr_debug("timeout value is zero\n");
	return -EINVAL;
	}

	if (info->label[0] == '\0' \|\|
	strnlen(info->label, MAX_HARDIDLETIMER_LABEL_SIZE)
	== MAX_HARDIDLETIMER_LABEL_SIZE) {
	pr_debug("label is empty or not nul-terminated\n");
	return -EINVAL;
	}

	mutex_lock(&list_mutex);

	info->timer = __hardidletimer_tg_find_by_label(info->label);
	if (info->timer) {
	info->timer->refcnt++;
	/* calculate remaining expiry time */
	tout = alarm_expires_remaining(&info->timer->alarm);
	ktimespec = ktime_to_timespec(tout);

	if (ktimespec.tv_sec > 0) {
	pr_debug("time_expiry_remaining %ld\n",
	ktimespec.tv_sec);
	alarm_start_relative(&info->timer->alarm, tout);
	}

	pr_debug("increased refcnt of timer %s to %u\n",
	info->label, info->timer->refcnt);
	} else {
	ret = hardidletimer_tg_create(info);
	if (ret < 0) {
	pr_debug("failed to create timer\n");
	mutex_unlock(&list_mutex);
	return ret;
	}
	}

	mutex_unlock(&list_mutex);

	return 0;
	}

	static void hardidletimer_tg_destroy(const struct xt_tgdtor_param *par)
	{
	const struct hardidletimer_tg_info *info = par->targinfo;

	pr_debug("destroy targinfo %s\n", info->label);

	mutex_lock(&list_mutex);

	if (--info->timer->refcnt == 0) {
	pr_debug("deleting timer %s\n", info->label);

	list_del(&info->timer->entry);
	alarm_cancel(&info->timer->alarm);
	cancel_work_sync(&info->timer->work);
	sysfs_remove_file(hardidletimer_tg_kobj,
	&info->timer->attr.attr);
	kfree(info->timer->attr.attr.name);
	kfree(info->timer);
	} else {
	pr_debug("decreased refcnt of timer %s to %u\n",
	info->label, info->timer->refcnt);
	}

	mutex_unlock(&list_mutex);
	}

	static struct xt_target hardidletimer_tg __read_mostly = {
	.name = "HARDIDLETIMER",
	.revision = 1,
	.family = NFPROTO_UNSPEC,
	.target = hardidletimer_tg_target,
	.targetsize = sizeof(struct hardidletimer_tg_info),
	.checkentry = hardidletimer_tg_checkentry,
	.destroy = hardidletimer_tg_destroy,
	.me = THIS_MODULE,
	};

	static struct class *hardidletimer_tg_class;

	static struct device *hardidletimer_tg_device;

	static int __init hardidletimer_tg_init(void)
	{
	int err;

	hardidletimer_tg_class = class_create(THIS_MODULE, "xt_hardidletimer");
	err = PTR_ERR(hardidletimer_tg_class);
	if (IS_ERR(hardidletimer_tg_class)) {
	pr_debug("couldn't register device class\n");
	goto out;
	}

	hardidletimer_tg_device = device_create(hardidletimer_tg_class, NULL,
	MKDEV(0, 0), NULL, "timers");
	err = PTR_ERR(hardidletimer_tg_device);
	if (IS_ERR(hardidletimer_tg_device)) {
	pr_debug("couldn't register system device\n");
	goto out_class;
	}

	hardidletimer_tg_kobj = &hardidletimer_tg_device->kobj;

	err = xt_register_target(&hardidletimer_tg);
	if (err < 0) {
	pr_debug("couldn't register xt target\n");
	goto out_dev;
	}

	return 0;
	out_dev:
	device_destroy(hardidletimer_tg_class, MKDEV(0, 0));
	out_class:
	class_destroy(hardidletimer_tg_class);
	out:
	return err;
	}

	static void __exit hardidletimer_tg_exit(void)
	{
	xt_unregister_target(&hardidletimer_tg);

	device_destroy(hardidletimer_tg_class, MKDEV(0, 0));
	class_destroy(hardidletimer_tg_class);
	}

	module_init(hardidletimer_tg_init);
	module_exit(hardidletimer_tg_exit);

	MODULE_AUTHOR("Timo Teras <ext-timo.teras@nokia.com>");
	MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
	MODULE_DESCRIPTION("Xtables: idle time monitor");
	MODULE_LICENSE("GPL v2");