netdev - Re: [RFC] net/bridge: port based vlan filtering for bridges

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Message-ID: <20120411083052.1ca6a6ef@nehalam.linuxnetplumber.net>
Date:	Wed, 11 Apr 2012 08:30:52 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] net/bridge: port based vlan filtering for bridges

On Wed, 11 Apr 2012 11:10:02 -0400
Benjamin LaHaise <bcrl@...ck.org> wrote:

> Hello folks,
> 
> Attached is the first stab at a patch to make it possible to filter packets 
> received from other bridge ports based on the port number.  This can be used 
> to emulate port based VLANs that some switches support.
> 
> The justification for this is a bit interesting.  Initially, I had been 
> filtering packets using firewall rules.  Unfortunately, the number of 
> filter rules becomes impossible to manage when trying to filter traffic 
> between 100 different ports.  CPU overhead of the filters is also a major 
> problem.
> 
> The particular use-case I'm dealing with is simulating wireless networks 
> on a system using LXC containers.  Each guest has a veth device that is a 
> member of the bridge, but the topology of which nodes can "hear" each other 
> changes at runtime.
> 
> Comments/thoughts?
> 

Nak. If firewall doesn't work then implement a better netfilter
module.

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