linux-kernel - Re: [PATCH] chaostables

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Message-ID: <45F12A69.1060406@ufomechanic.net>
Date:	Fri, 09 Mar 2007 09:35:37 +0000
From:	Amin Azez <azez@...mechanic.net>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
CC:	Patrick McHardy <kaber@...sh.net>,
	James Morris <jmorris@...ei.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Netfilter Developer Mailing List 
	<netfilter-devel@...ts.netfilter.org>
Subject: Re: [PATCH] chaostables

* Jan Engelhardt wrote, On 08/03/07 20:26:
> xt_portscan needs to keep track of what packets the machine has already 
> seen. So on the first SYN, the connection is marked with "1". (Then we 
> send our SYN-ACK... and the connection turns ESTABLISHED.) The next 
> packet that is received will be an ACK or an RST. But it must come 
> _exactly after_ the SYN, so just using --tcp-flags ACK will not work. A 
> state which can be remembered is required. For that, an automaton is 
> used, whose state is saved in the connection mark.

There would me more point in having this as a new match if it didn't
trample on the connection mark, but used it's own slot or flag-bit.

Sam
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