netdev - Re: Passive OS fingerprinting.

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Message-ID: <alpine.LNX.1.10.0807011623340.12878@fbirervta.pbzchgretzou.qr>
Date:	Tue, 1 Jul 2008 16:26:06 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: Passive OS fingerprinting.


On Tuesday 2008-07-01 15:08, Evgeniy Polyakov wrote:
>> >
>> >I'm not sure it is that simple. OSF uses common rules database
>> >shared with OpenBSD (and other *BSDs as well), so converting it into u32
>> >match would require noticeble efforts. But in theory it is probably
>> >doable.
>> 
>> This would be preferrable in my opinion since they both allow
>> programmable filters, but u32 appears to be more flexible. I'm
>> very reluctant to add new iptables modules that don't increase
>> expressiveness or provide other clear benefits since we already
>> have an insane amount of modules.

An iptables extension which you can use with -m osf --genre Linux
but which internally uses xt_u32.ko would be the perfect solution
ATM IMO. It would require a number of changes to the iptables API
though...
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