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

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Submitter dmitry pervushin
Date April 21, 2013, 9:53 a.m.
Message ID <1366537994-19511-2-git-send-email-dmitry.pervushin@linaro.org>
Download mbox | patch
Permalink /patch/238206/
State RFC
Headers show

Comments

dmitry pervushin - April 21, 2013, 9:53 a.m.
From: dmitry pervushin <dpervushin@gmail.com>

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

Signed-off-by: Ashish Sharma <ashishsharma@google.com>
Signed-off-by: JP Abgrall <jpa@google.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: dmitry pervushin <dmitry.pervushin@linaro.org>
---
 net/netfilter/xt_IDLETIMER.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)
Pablo Neira - April 26, 2013, 1:24 a.m.
Hi,

Same thing with this patch:

https://patchwork.kernel.org/patch/2333841/

Regards.

On Sun, Apr 21, 2013 at 11:53:13AM +0200, dmitry pervushin wrote:
> From: dmitry pervushin <dpervushin@gmail.com>
> 
> Fix the case in which timer has expired and we refresh it without
> sending the notification
> 
> Signed-off-by: Ashish Sharma <ashishsharma@google.com>
> Signed-off-by: JP Abgrall <jpa@google.com>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> Signed-off-by: dmitry pervushin <dmitry.pervushin@linaro.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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Patch

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);