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

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Message-ID: <4BD177FD.9020904@trash.net>
Date:	Fri, 23 Apr 2010 12:35:41 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jesper Dangaard Brouer <jdb@...x.dk>
CC:	Changli Gao <xiaosuo@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Linux Kernel Network Hackers <netdev@...r.kernel.org>,
	netfilter-devel@...r.kernel.org,
	Paul E McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: DDoS attack causing bad effect on conntrack searches

Jesper Dangaard Brouer wrote:
> I have added a stats counter to prove my case, which I think we should add to the kernel (to detect the case in the future).
> The DDoS attack has disappeared, so I guess I'll try to see if I can reproduce the problem in my testlab.
> 
> 
> 
> [PATCH] net: netfilter conntrack extended with extra stat counter.
> 
> From: Jesper Dangaard Brouer <hawk@...x.dk>
> 
> I suspect an unfortunatly series of events occuring under a DDoS
> attack, in function __nf_conntrack_find() nf_contrack_core.c.
> 
> Adding a stats counter to see if the search is restarted too often.

Applied, thanks Jesper.
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