netdev - Re: [PATCH] gre: fix ToS/DiffServ inherit bug

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Message-ID: <20090714172847.GA28917@ms2.inr.ac.ru>
Date:	Tue, 14 Jul 2009 21:28:47 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	David Miller <davem@...emloft.net>
Cc:	aj@...n.ch, voyo@...ip.pl, netdev@...r.kernel.org, kaber@...sh.net
Subject: Re: [PATCH] gre: fix ToS/DiffServ inherit bug

Hello!

On Tue, Jul 14, 2009 at 09:34:33AM -0700, David Miller wrote:
> Note that this only works out because one wouldn't specify ECN
> bits in the TOS to use for the tunnel.
> 
> But it demonstrates the outright danger of trying to use
> "undefined" flag bits in protocol header fields to pass
> private control flags into the driver from user interfaces.

Yes. My fault.

Well, in the form after the patch it will survive at least until
the next change of semantics of tos. :-)

Alexey
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