netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <20090213142204.GA27554@ioremap.net>
Date:	Fri, 13 Feb 2009 17:22:04 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Jan Engelhardt <jengelh@...ozas.de>
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 Fri, Feb 13, 2009 at 02:51:48PM +0100, Jan Engelhardt (jengelh@...ozas.de) wrote:
> >> config NETFILTER_XT_MATCH_COMMENT
> >>         tristate  '"comment" match support'
> >>         depends on NETFILTER_ADVANCED
> >>         ---help---
> >
> >But I placed OSF into net/ipv4/netfilter/ipt_osf.c, should it be moved
> >into different location?
> 
> That would be preferable -> net/netfilter/xt_osf.c.

Ok, I will move it there.

> >> >proper offset (modulo of the option size).
> >> 
> >> What if optp is odd?
> >
> >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.

-- 
	Evgeniy Polyakov
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