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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/slab.h> |
26 | #include <linux/leds.h> |
27 | #include <linux/mutex.h> |
28 | |
29 | #include <linux/netfilter/xt_LED.h> |
30 | |
31 | MODULE_LICENSE("GPL"); |
32 | MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>"); |
33 | MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match"); |
34 | |
35 | /* |
36 | * This is declared in here (the kernel module) only, to avoid having these |
37 | * dependencies in userspace code. This is what xt_led_info.internal_data |
38 | * points to. |
39 | */ |
40 | struct xt_led_info_internal { |
41 | struct led_trigger netfilter_led_trigger; |
42 | struct timer_list timer; |
43 | }; |
44 | |
45 | static unsigned int |
46 | led_tg(struct sk_buff *skb, const struct xt_target_param *par) |
47 | { |
48 | const struct xt_led_info *ledinfo = par->targinfo; |
49 | struct xt_led_info_internal *ledinternal = ledinfo->internal_data; |
50 | |
51 | /* |
52 | * If "always blink" is enabled, and there's still some time until the |
53 | * LED will switch off, briefly switch it off now. |
54 | */ |
55 | if ((ledinfo->delay > 0) && ledinfo->always_blink && |
56 | timer_pending(&ledinternal->timer)) |
57 | led_trigger_event(&ledinternal->netfilter_led_trigger,LED_OFF); |
58 | |
59 | led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL); |
60 | |
61 | /* If there's a positive delay, start/update the timer */ |
62 | if (ledinfo->delay > 0) { |
63 | mod_timer(&ledinternal->timer, |
64 | jiffies + msecs_to_jiffies(ledinfo->delay)); |
65 | |
66 | /* Otherwise if there was no delay given, blink as fast as possible */ |
67 | } else if (ledinfo->delay == 0) { |
68 | led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF); |
69 | } |
70 | |
71 | /* else the delay is negative, which means switch on and stay on */ |
72 | |
73 | return XT_CONTINUE; |
74 | } |
75 | |
76 | static void led_timeout_callback(unsigned long data) |
77 | { |
78 | struct xt_led_info *ledinfo = (struct xt_led_info *)data; |
79 | struct xt_led_info_internal *ledinternal = ledinfo->internal_data; |
80 | |
81 | led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF); |
82 | } |
83 | |
84 | static bool led_tg_check(const struct xt_tgchk_param *par) |
85 | { |
86 | struct xt_led_info *ledinfo = par->targinfo; |
87 | struct xt_led_info_internal *ledinternal; |
88 | int err; |
89 | |
90 | if (ledinfo->id[0] == '\0') { |
91 | printk(KERN_ERR KBUILD_MODNAME ": No 'id' parameter given.\n"); |
92 | return false; |
93 | } |
94 | |
95 | ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL); |
96 | if (!ledinternal) { |
97 | printk(KERN_CRIT KBUILD_MODNAME ": out of memory\n"); |
98 | return false; |
99 | } |
100 | |
101 | ledinternal->netfilter_led_trigger.name = ledinfo->id; |
102 | |
103 | err = led_trigger_register(&ledinternal->netfilter_led_trigger); |
104 | if (err) { |
105 | printk(KERN_CRIT KBUILD_MODNAME |
106 | ": led_trigger_register() failed\n"); |
107 | if (err == -EEXIST) |
108 | printk(KERN_ERR KBUILD_MODNAME |
109 | ": Trigger name is already in use.\n"); |
110 | goto exit_alloc; |
111 | } |
112 | |
113 | /* See if we need to set up a timer */ |
114 | if (ledinfo->delay > 0) |
115 | setup_timer(&ledinternal->timer, led_timeout_callback, |
116 | (unsigned long)ledinfo); |
117 | |
118 | ledinfo->internal_data = ledinternal; |
119 | |
120 | return true; |
121 | |
122 | exit_alloc: |
123 | kfree(ledinternal); |
124 | |
125 | return false; |
126 | } |
127 | |
128 | static void led_tg_destroy(const struct xt_tgdtor_param *par) |
129 | { |
130 | const struct xt_led_info *ledinfo = par->targinfo; |
131 | struct xt_led_info_internal *ledinternal = ledinfo->internal_data; |
132 | |
133 | if (ledinfo->delay > 0) |
134 | del_timer_sync(&ledinternal->timer); |
135 | |
136 | led_trigger_unregister(&ledinternal->netfilter_led_trigger); |
137 | kfree(ledinternal); |
138 | } |
139 | |
140 | static struct xt_target led_tg_reg __read_mostly = { |
141 | .name = "LED", |
142 | .revision = 0, |
143 | .family = NFPROTO_UNSPEC, |
144 | .target = led_tg, |
145 | .targetsize = XT_ALIGN(sizeof(struct xt_led_info)), |
146 | .checkentry = led_tg_check, |
147 | .destroy = led_tg_destroy, |
148 | .me = THIS_MODULE, |
149 | }; |
150 | |
151 | static int __init led_tg_init(void) |
152 | { |
153 | return xt_register_target(&led_tg_reg); |
154 | } |
155 | |
156 | static void __exit led_tg_exit(void) |
157 | { |
158 | xt_unregister_target(&led_tg_reg); |
159 | } |
160 | |
161 | module_init(led_tg_init); |
162 | module_exit(led_tg_exit); |
163 |
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