From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin LaHaise Subject: Re: [RFC] net/bridge: port based vlan filtering for bridges Date: Wed, 11 Apr 2012 11:36:29 -0400 Message-ID: <20120411153629.GC17739@kvack.org> References: <20120411151002.GA17739@kvack.org> <20120411083052.1ca6a6ef@nehalam.linuxnetplumber.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from kanga.kvack.org ([205.233.56.17]:49170 "EHLO kanga.kvack.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757252Ab2DKPga (ORCPT ); Wed, 11 Apr 2012 11:36:30 -0400 Content-Disposition: inline In-Reply-To: <20120411083052.1ca6a6ef@nehalam.linuxnetplumber.net> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, Apr 11, 2012 at 08:30:52AM -0700, Stephen Hemminger wrote: > On Wed, 11 Apr 2012 11:10:02 -0400 > Benjamin LaHaise 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. That still results in the CPU overhead of packet duplication for each and every bridge port regardless of the port receiving the packet or not. Hmmmm, would a NF_HOOK in should_deliver be okay? -ben -- "Thought is the essence of where you are now."