netdev - Re: [PATCH] netfilter: Fix br_nf_pre_routing() in conjunction with bridge-nf-call-ip(6)tables=0

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Message-ID: <20120103081521.2fec3a29@nehalam.linuxnetplumber.net>
Date:	Tue, 3 Jan 2012 08:15:21 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Richard Weinberger <richard@....at>
Cc:	davem@...emloft.net, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter: Fix br_nf_pre_routing() in conjunction with
 bridge-nf-call-ip(6)tables=0

On Tue,  3 Jan 2012 14:26:04 +0100
Richard Weinberger <richard@....at> wrote:

> If net.bridge.bridge-nf-call-iptables or net.bridge.bridge-nf-call-ip6tables
> are set to zero xt_physdev has no effect because skb->nf_bridge has not been set up.
> 
> Signed-off-by: Richard Weinberger <richard@....at>

I am not sure if this is a valid configuration. The setting of sysctl is saying
"don't do iptables on bridge (since I won't be using it)" and then you are later
doing iptables and expecting the settings as if the iptables setup was being
done.

Instead, you should just enable the net.bridge.bridge-nf-call-iptables sysctl.
If a distro chooses to disable it then you may have to do it explicitly.

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