netdev - Re: Passive OS fingerprint xtables match.

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Date:	Wed, 11 Mar 2009 13:00:38 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>
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>,
	Jan Engelhardt <jengelh@...ozas.de>
Subject: Re: Passive OS fingerprint xtables match.

Hi Pablo.

On Wed, Mar 11, 2009 at 10:54:21AM +0100, Pablo Neira Ayuso (pablo@...filter.org) wrote:
> > Fingerprint matching rules can be downloaded from OpenBSD source tree
> > and loaded via netlink connector into the kernel via special util found
> > in archive. It will also listen for events about matching packets.
> 
> I like this feature. We have nfnetlink so I don't see why we should use
> the netlink connector instead.

OSF exists about 6 years already, netlink configuration was added in
2005, I do not remember if nfnetlink existed those days (IIRC it did
not, since I reused ULOG netlink first), right now I just cleanup
what was written before.

> BTW, is there any difference with regards to userspace p0f apart from
> having this integrated into iptables?

There should be no major differences, there are some tweaks for the
MTU comparison, maybe something else.

-- 
	Evgeniy Polyakov
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