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authorAdam Nielsen <a.nielsen@shikadi.net>2010-04-09 16:51:40 +0200
committerPatrick McHardy <kaber@trash.net>2010-04-09 16:51:40 +0200
commitb660d0485efeff743c72f1be2185832de8477a24 (patch)
tree8ea3c2babf7f42d991c35370ec3a349eb4d72a31 /net/netfilter/xt_LED.c
parented86308f6179d8fa6151c2d0f652aad0091548e2 (diff)
netfilter: xt_LED: add refcounts to LED target
Add reference counting to the netfilter LED target, to fix errors when multiple rules point to the same target ("LED trigger already exists"). Signed-off-by: Adam Nielsen <a.nielsen@shikadi.net> Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/netfilter/xt_LED.c')
-rw-r--r--net/netfilter/xt_LED.c69
1 files changed, 63 insertions, 6 deletions
diff --git a/net/netfilter/xt_LED.c b/net/netfilter/xt_LED.c
index efcf56db23e8..bd102c77d1f0 100644
--- a/net/netfilter/xt_LED.c
+++ b/net/netfilter/xt_LED.c
@@ -31,12 +31,18 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Adam Nielsen <a.nielsen@shikadi.net>");
MODULE_DESCRIPTION("Xtables: trigger LED devices on packet match");
+static LIST_HEAD(xt_led_triggers);
+static DEFINE_MUTEX(xt_led_mutex);
+
/*
* 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 list_head list;
+ int refcnt;
+ char *trigger_id;
struct led_trigger netfilter_led_trigger;
struct timer_list timer;
};
@@ -53,7 +59,7 @@ led_tg(struct sk_buff *skb, const struct xt_target_param *par)
*/
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_OFF);
led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);
@@ -74,12 +80,23 @@ led_tg(struct sk_buff *skb, const struct xt_target_param *par)
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;
+ struct xt_led_info_internal *ledinternal = (struct xt_led_info_internal *)data;
led_trigger_event(&ledinternal->netfilter_led_trigger, LED_OFF);
}
+static struct xt_led_info_internal *led_trigger_lookup(const char *name)
+{
+ struct xt_led_info_internal *ledinternal;
+
+ list_for_each_entry(ledinternal, &xt_led_triggers, list) {
+ if (!strcmp(name, ledinternal->netfilter_led_trigger.name)) {
+ return ledinternal;
+ }
+ }
+ return NULL;
+}
+
static int led_tg_check(const struct xt_tgchk_param *par)
{
struct xt_led_info *ledinfo = par->targinfo;
@@ -91,11 +108,25 @@ static int led_tg_check(const struct xt_tgchk_param *par)
return -EINVAL;
}
+ mutex_lock(&xt_led_mutex);
+
+ ledinternal = led_trigger_lookup(ledinfo->id);
+ if (ledinternal) {
+ ledinternal->refcnt++;
+ goto out;
+ }
+
+ err = -ENOMEM;
ledinternal = kzalloc(sizeof(struct xt_led_info_internal), GFP_KERNEL);
if (!ledinternal)
- return -ENOMEM;
+ goto exit_mutex_only;
+
+ ledinternal->trigger_id = kstrdup(ledinfo->id, GFP_KERNEL);
+ if (!ledinternal->trigger_id)
+ goto exit_internal_alloc;
- ledinternal->netfilter_led_trigger.name = ledinfo->id;
+ ledinternal->refcnt = 1;
+ ledinternal->netfilter_led_trigger.name = ledinternal->trigger_id;
err = led_trigger_register(&ledinternal->netfilter_led_trigger);
if (err) {
@@ -108,13 +139,26 @@ static int led_tg_check(const struct xt_tgchk_param *par)
/* See if we need to set up a timer */
if (ledinfo->delay > 0)
setup_timer(&ledinternal->timer, led_timeout_callback,
- (unsigned long)ledinfo);
+ (unsigned long)ledinternal);
+
+ list_add_tail(&ledinternal->list, &xt_led_triggers);
+
+out:
+ mutex_unlock(&xt_led_mutex);
ledinfo->internal_data = ledinternal;
+
return 0;
exit_alloc:
+ kfree(ledinternal->trigger_id);
+
+exit_internal_alloc:
kfree(ledinternal);
+
+exit_mutex_only:
+ mutex_unlock(&xt_led_mutex);
+
return err;
}
@@ -123,10 +167,23 @@ 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;
+ mutex_lock(&xt_led_mutex);
+
+ if (--ledinternal->refcnt) {
+ mutex_unlock(&xt_led_mutex);
+ return;
+ }
+
+ list_del(&ledinternal->list);
+
if (ledinfo->delay > 0)
del_timer_sync(&ledinternal->timer);
led_trigger_unregister(&ledinternal->netfilter_led_trigger);
+
+ mutex_unlock(&xt_led_mutex);
+
+ kfree(ledinternal->trigger_id);
kfree(ledinternal);
}