netdev - Re: [PATCH 32/34] netfilter: bridge: move br

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Message-ID: <20140930085802.15460008@urahara>
Date:	Tue, 30 Sep 2014 08:58:02 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	netfilter-devel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH 32/34] netfilter: bridge: move br_netfilter out of the
 core

On Mon, 29 Sep 2014 14:39:21 +0200
Pablo Neira Ayuso <pablo@...filter.org> wrote:

> Jesper reported that br_netfilter always registers the hooks since
> this is part of the bridge core. This harms performance for people that
> don't need this.
> 
> This patch modularizes br_netfilter so it can be rmmod'ed, thus,
> the hooks can be unregistered. I think the bridge netfilter should have
> been a separated module since the beginning, Patrick agreed on that.
> 
> Note that this is breaking compatibility for users that expect that
> bridge netfilter is going to be available after explicitly 'modprobe
> bridge' or via automatic load through brctl.
> 
> However, the damage can be easily undone by modprobing br_netfilter.
> The bridge core also spots a message to provide a clue to people that
> didn't notice that this has been deprecated.
> 
> On top of that, the plan is that nftables will not rely on this software
> layer, but integrate the connection tracking into the bridge layer to
> enable stateful filtering and NAT, which is was bridge netfilter users
> seem to require.
> 
> This patch still keeps the fake_dst_ops in the bridge core, since this
> is required by when the bridge port is initialized. So we can safely
> modprobe/rmmod br_netfilter anytime.
> 
> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
> Acked-by: Florian Westphal <fw@...len.de>

I think this is a good idea but you can't break users.

We need to figure out a way to autoload br_netfilter module on first use.

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