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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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