Double stacked VLANs (was Re: [VLAN] Question on header check)

[deweerdt at free.fr (Frederik Deweerdt)]

On Fri, Jun 16, 2006 at 09:32:30AM -0700, Ben Greear wrote:
> Frederik Deweerdt wrote:
> >On Fri, Jun 16, 2006 at 01:12:06PM +0100, Alex Zeffertt wrote:
> >>>>Another possible problem:  what if you are trying to encapsulate vlan 7 inside
> >>>>of vlan 7.  How do you know to double-encapsulate?  What if user-space is sending
> >>>>a pre-built VLAN frame with a raw socket?  I'm not sure there is enough info as to
> >>>>the intent to encapsulate or not once the VLAN code receives the packet.
> >>>
> >>>I see how my proposal was wrong. Let me wild guess again :). I wondered if the following
> >>>code could be better. The idea being that the code could determine the need for
> >>>encapsulating or not from the interface's nesting level and the actual number of VLAN tags in the packet.
> >>
> >>
> >>
> >>I think we've had this conversation before.  Search the list archives for "vlan Q in Q"
> >Thanks for the pointer. Do you know why your patch didn't get merged into mainline?
> 
> If I remember right, it had the same issues with bridging and raw packets.
> 
> I don't have a lot of time to work on vlan code at the moment, but you all
> can work on patches and if we get something that works, I'll review it and
> see if netdev will merge it.
> 
> [... tests to do ...]

Thanks for your feedback Ben, I'll setup those tests so that we'll be able to
spot the potential regressions.

Regards,
Frederik