linux-kernel - [PATCH 1/2] netfilter: idletimers - fix the case of already expired timer

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Date:	Sun, 21 Apr 2013 11:53:13 +0200
From:	dmitry pervushin <dmitry.pervushin@...aro.org>
To:	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	patches@...aro.org, dmitry pervushin <dpervushin@...il.com>,
	Ashish Sharma <ashishsharma@...gle.com>,
	JP Abgrall <jpa@...gle.com>,
	John Stultz <john.stultz@...aro.org>,
	dmitry pervushin <dmitry.pervushin@...aro.org>
Subject: [PATCH 1/2] netfilter: idletimers - fix the case of already expired timer

From: dmitry pervushin <dpervushin@...il.com>

Fix the case in which timer has expired and we refresh it without
sending the notification

Signed-off-by: Ashish Sharma <ashishsharma@...gle.com>
Signed-off-by: JP Abgrall <jpa@...gle.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: dmitry pervushin <dmitry.pervushin@...aro.org>
---
 net/netfilter/xt_IDLETIMER.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c
index f407ebc1..3540c04 100644
--- a/net/netfilter/xt_IDLETIMER.c
+++ b/net/netfilter/xt_IDLETIMER.c
@@ -168,14 +168,22 @@ static unsigned int idletimer_tg_target(struct sk_buff *skb,
 					 const struct xt_action_param *par)
 {
 	const struct idletimer_tg_info *info = par->targinfo;
+	unsigned long now = jiffies;
 
 	pr_debug("resetting timer %s, timeout period %u\n",
 		 info->label, info->timeout);
 
 	BUG_ON(!info->timer);
 
+	if (time_before(info->timer->timer.expires, now)) {
+		schedule_work(&info->timer->work);
+		pr_debug("Starting timer %s (Expired, Jiffies): %lu, %lu\n",
+			 info->label, info->timer->timer.expires, now);
+	}
+
+	/* TODO: Avoid modifying timers on each packet */
 	mod_timer(&info->timer->timer,
-		  msecs_to_jiffies(info->timeout * 1000) + jiffies);
+		  msecs_to_jiffies(info->timeout * 1000) + now);
 
 	return XT_CONTINUE;
 }
@@ -184,6 +192,7 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
 {
 	struct idletimer_tg_info *info = par->targinfo;
 	int ret;
+	unsigned long now = jiffies;
 
 	pr_debug("checkentry targinfo%s\n", info->label);
 
@@ -204,8 +213,13 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par)
 	info->timer = __idletimer_tg_find_by_label(info->label);
 	if (info->timer) {
 		info->timer->refcnt++;
+		if (time_before(info->timer->timer.expires, now)) {
+			schedule_work(&info->timer->work);
+			pr_debug("Starting Checkentry timer (Expired, Jiffies): %lu, %lu\n",
+				info->timer->timer.expires, now);
+		}
 		mod_timer(&info->timer->timer,
-			  msecs_to_jiffies(info->timeout * 1000) + jiffies);
+			  msecs_to_jiffies(info->timeout * 1000) + now);
 
 		pr_debug("increased refcnt of timer %s to %u\n",
 			 info->label, info->timer->refcnt);
-- 
1.7.10.4

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