[net-next-2.6.git] / net / netfilter / xt_LED.c

/*
 * xt_LED.c - netfilter target to make LEDs blink upon packet matches
 *
 * Copyright (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 *
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/leds.h>
#include <linux/mutex.h>

#include <linux/netfilter/xt_LED.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>");
MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match");

/*
 * This is declared in here (the kernel module) only, to avoid having these
 * dependencies in userspace code.  This is what xt_led_info.internal_data
 * points to.
 */
struct xt_led_info_internal {
	struct led_trigger netfilter_led_trigger;
	struct timer_list timer;
};

static unsigned int
led_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
	const struct xt_led_info *ledinfo = par->targinfo;
	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;

	/*
	 * If "always blink" is enabled, and there's still some time until the
	 * LED will switch off, briefly switch it off now.
	 */
	if ((ledinfo->delay > 0) && ledinfo->always_blink &&
	    timer_pending(&ledinternal->timer))
		led_trigger_event(&ledinternal->netfilter_led_trigger,LED_OFF);

	led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);

	/* If there's a positive delay, start/update the timer */
	if (ledinfo->delay > 0) {
		mod_timer(&ledinternal->timer,
			  jiffies + msecs_to_jiffies(ledinfo->delay));

	/* Otherwise if there was no delay given, blink as fast as possible */
	} else if (ledinfo->delay == 0) {
		led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
	}

	/* else the delay is negative, which means switch on and stay on */

	return XT_CONTINUE;
}

static void led_timeout_callback(unsigned long data)
{
	struct xt_led_info *ledinfo = (struct xt_led_info *)data;
	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;

	led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
}

static bool led_tg_check(const struct xt_tgchk_param *par)
{
	struct xt_led_info *ledinfo = par->targinfo;
	struct xt_led_info_internal *ledinternal;
	int err;

	if (ledinfo->id[0] == '\0') {
		printk(KERN_ERR KBUILD_MODNAME ": No 'id' parameter given.\n");
		return false;
	}

	ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL);
	if (!ledinternal) {
		printk(KERN_CRIT KBUILD_MODNAME ": out of memory\n");
		return false;
	}

	ledinternal->netfilter_led_trigger.name = ledinfo->id;

	err = led_trigger_register(&ledinternal->netfilter_led_trigger);
	if (err) {
		printk(KERN_CRIT KBUILD_MODNAME
			": led_trigger_register() failed\n");
		if (err == -EEXIST)
			printk(KERN_ERR KBUILD_MODNAME
				": Trigger name is already in use.\n");
		goto exit_alloc;
	}

	/* See if we need to set up a timer */
	if (ledinfo->delay > 0)
		setup_timer(&ledinternal->timer, led_timeout_callback,
			    (unsigned long)ledinfo);

	ledinfo->internal_data = ledinternal;

	return true;

exit_alloc:
	kfree(ledinternal);

	return false;
}

static void led_tg_destroy(const struct xt_tgdtor_param *par)
{
	const struct xt_led_info *ledinfo = par->targinfo;
	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;

	if (ledinfo->delay > 0)
		del_timer_sync(&ledinternal->timer);

	led_trigger_unregister(&ledinternal->netfilter_led_trigger);
	kfree(ledinternal);
}

static struct xt_target led_tg_reg __read_mostly = {
	.name		= "LED",
	.revision	= 0,
	.family		= NFPROTO_UNSPEC,
	.target		= led_tg,
	.targetsize	= sizeof(struct xt_led_info),
	.checkentry	= led_tg_check,
	.destroy	= led_tg_destroy,
	.me		= THIS_MODULE,
};

static int __init led_tg_init(void)
{
	return xt_register_target(&led_tg_reg);
}

static void __exit led_tg_exit(void)
{
	xt_unregister_target(&led_tg_reg);
}

module_init(led_tg_init);
module_exit(led_tg_exit);
Commit	Line	Data
268cb38e AN	1	/*
	2	* xt_LED.c - netfilter target to make LEDs blink upon packet matches
	3	*
	4	* Copyright (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	18	* 02110-1301 USA.
	19	*
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/skbuff.h>
	24	#include <linux/netfilter/x_tables.h>
	25	#include <linux/leds.h>
	26	#include <linux/mutex.h>
	27
	28	#include <linux/netfilter/xt_LED.h>
	29
	30	MODULE_LICENSE("GPL");
	31	MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>");
	32	MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match");
	33
	34	/*
	35	* This is declared in here (the kernel module) only, to avoid having these
	36	* dependencies in userspace code. This is what xt_led_info.internal_data
	37	* points to.
	38	*/
	39	struct xt_led_info_internal {
	40	struct led_trigger netfilter_led_trigger;
	41	struct timer_list timer;
	42	};
	43
	44	static unsigned int
	45	led_tg(struct sk_buff skb, const struct xt_target_param par)
	46	{
	47	const struct xt_led_info *ledinfo = par->targinfo;
	48	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
	49
	50	/*
	51	* If "always blink" is enabled, and there's still some time until the
	52	* LED will switch off, briefly switch it off now.
	53	*/
	54	if ((ledinfo->delay > 0) && ledinfo->always_blink &&
	55	timer_pending(&ledinternal->timer))
	56	led_trigger_event(&ledinternal->netfilter_led_trigger,LED_OFF);
	57
	58	led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);
	59
	60	/* If there's a positive delay, start/update the timer */
	61	if (ledinfo->delay > 0) {
	62	mod_timer(&ledinternal->timer,
	63	jiffies + msecs_to_jiffies(ledinfo->delay));
	64
65	/* Otherwise if there was no delay given, blink as fast as possible */
66	} else if (ledinfo->delay == 0) {
67	led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
68	}
69
70	/* else the delay is negative, which means switch on and stay on */
71
72	return XT_CONTINUE;
73	}
74
75	static void led_timeout_callback(unsigned long data)
76	{
77	struct xt_led_info ledinfo = (struct xt_led_info )data;
78	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
79
80	led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
81	}
82
83	static bool led_tg_check(const struct xt_tgchk_param *par)
84	{
85	struct xt_led_info *ledinfo = par->targinfo;
86	struct xt_led_info_internal *ledinternal;
87	int err;
88
89	if (ledinfo->id[0] == '\0') {
90	printk(KERN_ERR KBUILD_MODNAME ": No 'id' parameter given.\n");
91	return false;
92	}
93
94	ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL);
95	if (!ledinternal) {
96	printk(KERN_CRIT KBUILD_MODNAME ": out of memory\n");
97	return false;
98	}
99
100	ledinternal->netfilter_led_trigger.name = ledinfo->id;
101
102	err = led_trigger_register(&ledinternal->netfilter_led_trigger);
103	if (err) {
104	printk(KERN_CRIT KBUILD_MODNAME
105	": led_trigger_register() failed\n");
106	if (err == -EEXIST)
107	printk(KERN_ERR KBUILD_MODNAME
108	": Trigger name is already in use.\n");
109	goto exit_alloc;
110	}
111
112	/* See if we need to set up a timer */
113	if (ledinfo->delay > 0)
114	setup_timer(&ledinternal->timer, led_timeout_callback,
115	(unsigned long)ledinfo);
116
117	ledinfo->internal_data = ledinternal;
118
119	return true;
120
121	exit_alloc:
122	kfree(ledinternal);
123
124	return false;
125	}
126
127	static void led_tg_destroy(const struct xt_tgdtor_param *par)
128	{
129	const struct xt_led_info *ledinfo = par->targinfo;
130	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
131
132	if (ledinfo->delay > 0)
133	del_timer_sync(&ledinternal->timer);
134
135	led_trigger_unregister(&ledinternal->netfilter_led_trigger);
136	kfree(ledinternal);
137	}
138
139	static struct xt_target led_tg_reg __read_mostly = {
140	.name = "LED",
141	.revision = 0,
142	.family = NFPROTO_UNSPEC,
143	.target = led_tg,
7d5f7ed8	144	.targetsize = sizeof(struct xt_led_info),
268cb38e AN	145	.checkentry = led_tg_check,
	146	.destroy = led_tg_destroy,
	147	.me = THIS_MODULE,
	148	};
	149
	150	static int __init led_tg_init(void)
	151	{
	152	return xt_register_target(&led_tg_reg);
	153	}
	154
	155	static void __exit led_tg_exit(void)
	156	{
	157	xt_unregister_target(&led_tg_reg);
	158	}
	159
	160	module_init(led_tg_init);
	161	module_exit(led_tg_exit);