linux-kernel - Re: [RFD] iptables: mangle table obsoletes filter table

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Message-ID: <26984.1192942439@turing-police.cc.vt.edu>
Date:	Sun, 21 Oct 2007 00:53:59 -0400
From:	Valdis.Kletnieks@...edu
To:	Al Boldi <a1426z@...ab.com>
Cc:	Bill Davidsen <davidsen@....com>,
	Patrick McHardy <kaber@...sh.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	linux-net@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFD] iptables: mangle table obsoletes filter table

On Sun, 21 Oct 2007 07:31:58 +0300, Al Boldi said:
> > Well, for example to stop any transient packets being forwarded.  You could 
> > probably hack around this using mark's, but you can't stop the implied
> > route lookup, unless you stop it in prerouting.
> 
> Basically, you have one big unintended gaping whole in your firewall, that 
> could easily be exploited for DoS attacks at the least, unless you put in 
> specific rules to limit this.

OK, the light bulb just went on... ;)

We actually *do* have an issue with the flip side of that - it's a frikking
pain to make packets that show up on eth0 with a destination of 127.0.0.1
go away un-noticed - or at least I'm assuming it's the flip side of the same
issue.

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