netdev - Re: [PATCH v2] inetpeer: fix token initialization

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Date:	Thu, 27 Sep 2012 16:18:36 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH v2] inetpeer: fix token initialization

On Thu, 2012-09-27 at 16:11 +0200, Nicolas Dichtel wrote:
> When jiffies wraps around (for example, 5 minutes after the boot, see
> INITIAL_JIFFIES) and peer has just been created, now - peer->rate_last can be
> < XRLIM_BURST_FACTOR * timeout, so token is not set to the maximum value, thus
> some icmp packets can be unexpectedly dropped.
> 
> Fix this case by initializing last_rate to 60 seconds in the past.
> 
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> ---
> v2: fix initialization of peer instead of adding some tests in
>     inet_peer_xrlim_allow()
> 
>  net/ipv4/inetpeer.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
> index e1e0a4e..c7527f6 100644
> --- a/net/ipv4/inetpeer.c
> +++ b/net/ipv4/inetpeer.c
> @@ -510,7 +510,10 @@ relookup:
>  					secure_ipv6_id(daddr->addr.a6));
>  		p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
>  		p->rate_tokens = 0;
> -		p->rate_last = 0;
> +		/* 60*HZ is arbitrary, but chosen enough high so that the first
> +		 * calculation of tokens is at its maximum.
> +		 */
> +		p->rate_last = jiffies - 60*HZ;
>  		INIT_LIST_HEAD(&p->gc_list);
>  
>  		/* Link the node. */

Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Thanks !


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