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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 23 Apr 2010 14:45:59 +0200 (CEST)
From:	Jesper Dangaard Brouer <hawk@...u.dk>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>, hawk@...x.dk,
	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

On Fri, 23 Apr 2010, Patrick McHardy wrote:

> That sounds like a good idea. But lets what for Jesper's test results
> before we start fixing this problem :)

I will first have time to perform the tests Monday or Tuesday.

BUT I have just noticed there seems to be a corrolation between conntrack 
early_drop and searches.  I have upload a new graph:

  http://people.netfilter.org/hawk/DDoS/2010-04-12__001/conntrack_early_drop002.png

I have not had time to checkout the code path yet...

Cheers,
   Jesper Brouer

--
-------------------------------------------------------------------
MSc. Master of Computer Science
Dept. of Computer Science, University of Copenhagen
Author of http://www.adsl-optimizer.dk
-------------------------------------------------------------------
--
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