netdev - Re: [resend] Passive OS fingerprint xtables match.

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Message-ID: <4A27B5A1.9050300@trash.net>
Date:	Thu, 04 Jun 2009 13:53:05 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Evgeniy Polyakov <zbr@...emap.net>
CC:	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: [resend] Passive OS fingerprint xtables match.

Evgeniy Polyakov wrote:
> Hi.
> 
> On Wed, May 27, 2009 at 06:28:16PM +0200, Patrick McHardy (kaber@...sh.net) wrote:
>>> You will find something like this in the syslog:
>>> Windows [2000:SP3:Windows XP Pro SP1, 2000 SP3]: 11.22.33.55:4024 -> 
>>> 11.22.33.44:139 hops=4
>>> Linux [2.5:]: 1.2.3.4:44448 -> 11.22.33.44:22 hops=4
>> Please convert this to use nf_log_packet().
> 
> That's hard - there is no hook number in the match function, so we do
> not really know if it is forward, input or prerouting.

This is really needed, spamming the ring buffer is not a good option.

I'd say just add the hook number to xt_match_param. Its a bit
inconsistent anyways that we're handing it to checkentry for
validation, but not to the match function.
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