netdev - Re: DDoS attack causing bad effect on conntrack searches

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Message-ID: <1272020766.7895.7975.camel@edumazet-laptop>
Date:	Fri, 23 Apr 2010 13:06:06 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>, paulmck@...ux.vnet.ibm.com,
	Changli Gao <xiaosuo@...il.com>, hawk@...x.dk,
	Linux Kernel Network Hackers <netdev@...r.kernel.org>,
	Netfilter Developers <netfilter-devel@...r.kernel.org>
Subject: Re: DDoS attack causing bad effect on conntrack searches

Le vendredi 23 avril 2010 à 12:36 +0200, Patrick McHardy a écrit :
> Eric Dumazet wrote:
> > Le jeudi 22 avril 2010 à 23:03 +0200, Eric Dumazet a écrit :
> >>> Guess I have to reproduce the DoS attack in a testlab (I will first have 
> >>> time Tuesday).  So we can determine if its bad hashing or restart of the 
> >>> search loop.
> >>>
> > 
> > Or very long chains, if attacker managed to find a jhash flaw.
> 
> That should be visible in the "searched" statistic.
> 
> > You could add a lookup_restart counter :
> 
> I've applied Jespers equivalent patch.

Yes of course, I missed it or I would not have cooked it ;)

Thanks


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