linux-kernel - Re: BUG: ip6tables IPv6-REDIRECT over bridges

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Date:	Thu, 20 Feb 2014 20:32:31 +0100
From:	Florian Westphal <fw@...len.de>
To:	Artie Hamilton <artiemhamilton@...oo.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"\"David S. Miller\"" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netfilter@...r.kernel.org" <netfilter@...r.kernel.org>,
	"coreteam@...filter.org" <coreteam@...filter.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: BUG: ip6tables IPv6-REDIRECT over bridges

Artie Hamilton <artiemhamilton@...oo.com> wrote:
> Now the same thing should be done for IPv6. It should works quite similar
> (I just assume the above mentioned steps are already done):
> 
> $ sysctl -w net.ipv6.conf.br0.accept_ra=2
> $ sysctl -w net.bridge.bridge-nf-call-ip6tables=1
> $ ip6tables -t nat -A PREROUTING -p tcp -m tcp --dport 8080 -j REDIRECT --to-ports 81
> 
> But here is the problem: Connections will not be started. I see for example
> connections getting started to the service like this on the client:

Yes, because bridge layer does not detect when addresses have been
rewritten.

The check is only implemented for ipv4, see dnat_took_place use in br_netfilter.c
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