rt2x00usb: fix anchor initialization
[linux/fpc-iii.git] / net / netfilter / xt_LED.c
blob3ba31c194ccec3101aa0979bb18a693d30d1c68b
1 /*
2 * xt_LED.c - netfilter target to make LEDs blink upon packet matches
4 * Copyright (C) 2008 Adam Nielsen <a.nielsen@shikadi.net>
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.
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.
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.
21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 #include <linux/module.h>
23 #include <linux/skbuff.h>
24 #include <linux/netfilter/x_tables.h>
25 #include <linux/slab.h>
26 #include <linux/leds.h>
27 #include <linux/mutex.h>
29 #include <linux/netfilter/xt_LED.h>
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>");
33 MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match");
34 MODULE_ALIAS("ipt_LED");
35 MODULE_ALIAS("ip6t_LED");
37 static LIST_HEAD(xt_led_triggers);
38 static DEFINE_MUTEX(xt_led_mutex);
41 * This is declared in here (the kernel module) only, to avoid having these
42 * dependencies in userspace code. This is what xt_led_info.internal_data
43 * points to.
45 struct xt_led_info_internal {
46 struct list_head list;
47 int refcnt;
48 char *trigger_id;
49 struct led_trigger netfilter_led_trigger;
50 struct timer_list timer;
53 #define XT_LED_BLINK_DELAY 50 /* ms */
55 static unsigned int
56 led_tg(struct sk_buff *skb, const struct xt_action_param *par)
58 const struct xt_led_info *ledinfo = par->targinfo;
59 struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
60 unsigned long led_delay = XT_LED_BLINK_DELAY;
63 * If "always blink" is enabled, and there's still some time until the
64 * LED will switch off, briefly switch it off now.
66 if ((ledinfo->delay > 0) && ledinfo->always_blink &&
67 timer_pending(&ledinternal->timer))
68 led_trigger_blink_oneshot(&ledinternal->netfilter_led_trigger,
69 &led_delay, &led_delay, 1);
70 else
71 led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);
73 /* If there's a positive delay, start/update the timer */
74 if (ledinfo->delay > 0) {
75 mod_timer(&ledinternal->timer,
76 jiffies + msecs_to_jiffies(ledinfo->delay));
78 /* Otherwise if there was no delay given, blink as fast as possible */
79 } else if (ledinfo->delay == 0) {
80 led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
83 /* else the delay is negative, which means switch on and stay on */
85 return XT_CONTINUE;
88 static void led_timeout_callback(unsigned long data)
90 struct xt_led_info_internal *ledinternal = (struct xt_led_info_internal *)data;
92 led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
95 static struct xt_led_info_internal *led_trigger_lookup(const char *name)
97 struct xt_led_info_internal *ledinternal;
99 list_for_each_entry(ledinternal, &xt_led_triggers, list) {
100 if (!strcmp(name, ledinternal->netfilter_led_trigger.name)) {
101 return ledinternal;
104 return NULL;
107 static int led_tg_check(const struct xt_tgchk_param *par)
109 struct xt_led_info *ledinfo = par->targinfo;
110 struct xt_led_info_internal *ledinternal;
111 int err;
113 if (ledinfo->id[0] == '\0') {
114 pr_info("No 'id' parameter given.\n");
115 return -EINVAL;
118 mutex_lock(&xt_led_mutex);
120 ledinternal = led_trigger_lookup(ledinfo->id);
121 if (ledinternal) {
122 ledinternal->refcnt++;
123 goto out;
126 err = -ENOMEM;
127 ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL);
128 if (!ledinternal)
129 goto exit_mutex_only;
131 ledinternal->trigger_id = kstrdup(ledinfo->id, GFP_KERNEL);
132 if (!ledinternal->trigger_id)
133 goto exit_internal_alloc;
135 ledinternal->refcnt = 1;
136 ledinternal->netfilter_led_trigger.name = ledinternal->trigger_id;
138 err = led_trigger_register(&ledinternal->netfilter_led_trigger);
139 if (err) {
140 pr_err("Trigger name is already in use.\n");
141 goto exit_alloc;
144 /* See if we need to set up a timer */
145 if (ledinfo->delay > 0)
146 setup_timer(&ledinternal->timer, led_timeout_callback,
147 (unsigned long)ledinternal);
149 list_add_tail(&ledinternal->list, &xt_led_triggers);
151 out:
152 mutex_unlock(&xt_led_mutex);
154 ledinfo->internal_data = ledinternal;
156 return 0;
158 exit_alloc:
159 kfree(ledinternal->trigger_id);
161 exit_internal_alloc:
162 kfree(ledinternal);
164 exit_mutex_only:
165 mutex_unlock(&xt_led_mutex);
167 return err;
170 static void led_tg_destroy(const struct xt_tgdtor_param *par)
172 const struct xt_led_info *ledinfo = par->targinfo;
173 struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
175 mutex_lock(&xt_led_mutex);
177 if (--ledinternal->refcnt) {
178 mutex_unlock(&xt_led_mutex);
179 return;
182 list_del(&ledinternal->list);
184 if (ledinfo->delay > 0)
185 del_timer_sync(&ledinternal->timer);
187 led_trigger_unregister(&ledinternal->netfilter_led_trigger);
189 mutex_unlock(&xt_led_mutex);
191 kfree(ledinternal->trigger_id);
192 kfree(ledinternal);
195 static struct xt_target led_tg_reg __read_mostly = {
196 .name = "LED",
197 .revision = 0,
198 .family = NFPROTO_UNSPEC,
199 .target = led_tg,
200 .targetsize = sizeof(struct xt_led_info),
201 .checkentry = led_tg_check,
202 .destroy = led_tg_destroy,
203 .me = THIS_MODULE,
206 static int __init led_tg_init(void)
208 return xt_register_target(&led_tg_reg);
211 static void __exit led_tg_exit(void)
213 xt_unregister_target(&led_tg_reg);
216 module_init(led_tg_init);
217 module_exit(led_tg_exit);