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

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Date:	Fri, 26 Apr 2013 03:24:38 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	dmitry pervushin <dmitry.pervushin@...aro.org>
Cc:	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	patches@...aro.org, dmitry pervushin <dpervushin@...il.com>,
	Ashish Sharma <ashishsharma@...gle.com>,
	JP Abgrall <jpa@...gle.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [PATCH 1/2] netfilter: idletimers - fix the case of already
 expired timer

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@...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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