netdev - Re: IGMP sent to Foreign VLAN

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Date:	Sat, 11 Oct 2008 00:45:36 +0200
From:	Benny Amorsen <benny+usenet@...rsen.dk>
To:	Jarod Neuner <j.neuner@...workharbor.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>
Subject: Re: IGMP sent to Foreign VLAN

Jarod Neuner <j.neuner@...workharbor.com> writes:

> My original thought was to do something like this in net/core/dev.c
> using a method similar to handle_bridge or handle_macvlen.  So, if the
> packet doesn't get handled by the ptype_base list and IFF_ALLVLAN is
> set, then strip the header and let the packet through.  The sticky point
> would be whether or not this policy should be enabled by default, as it
> seems to be in other network stacks.

So if I tcpdump on the base device, IFF_ALLVLAN gets set and packets
from unknown VLAN's suddenly lose their VLAN headers? That's a
security problem.


/Benny

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