netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <alpine.LSU.2.00.0902131541200.17695@fbirervta.pbzchgretzou.qr>
Date:	Fri, 13 Feb 2009 15:41:36 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Evgeniy Polyakov <zbr@...emap.net>
cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match.


On Friday 2009-02-13 15:22, Evgeniy Polyakov wrote:
>> >
>> >It cant, header is fixed and every option length is also fixed (and its
>> >size is checked).
>> 
>> This RFC-compliant ("An option may begin on any octet boundary.")
>> option byte stream seems to produce an odd optp value:
>> 
>> 01 02 04 05 a0 00
>> 
>> or where did I go wrong?
>
>OSF checks only MSS and timestamp options.

But still it has to jump over anything it does not check.
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