netdev - Re: [PATCH] allow VLAN interface on top of bridge interface

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Date:	Thu, 12 Apr 2007 15:01:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	j.borsboom@...smusmc.nl
Subject: Re: [PATCH] allow VLAN interface on top of bridge interface

From: Ben Greear <greearb@...delatech.com>
Date: Thu, 12 Apr 2007 14:45:07 -0700

> Andrew Morton wrote:
> > 
> > Begin forwarded message:
> > 
> > Date: Thu, 12 Apr 2007 21:50:00 +0200 (CEST)
> > From: Jerome Borsboom <j.borsboom@...smusmc.nl>
> > To: linux-kernel@...r.kernel.org
> > Subject: [PATCH] allow VLAN interface on top of bridge interface
> > 
> > 
> > When a VLAN interface is created on top of a bridge interface and 
> > netfilter is enabled to see the bridged packets, the packets can be 
> > corrupted when passing through the netfilter code. This is caused by the 
> > VLAN driver not setting the 'protocol' and 'nh' members of the sk_buff 
> > structure. In general, this is no problem as the VLAN interface is mostly 
> > connected to a physical ethernet interface which does not use the 
> > 'protocol' and 'nh' members. For a bridge interface, however, these 
> > members do matter.
> 
> Why only do this inside that if clause?  I can see only setting
> nh.raw in that clause, but it seems like the protocol should be set
> regardless.

Because outside the if clause we are making the packet look
like a normal ethernet frame to the rest of the stack, and
only adding the VLAN tag at the very last moment in
->hard_start_xmit().
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