netdev - Re: switching network namespace midway

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Message-ID: <87a9var0ih.fsf@xmission.com>
Date:	Thu, 25 Oct 2012 09:15:34 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	rsa <ravi.mlists@...il.com>, netdev@...r.kernel.org
Subject: Re: switching network namespace midway

Benjamin LaHaise <bcrl@...ck.org> writes:

> On Thu, Oct 25, 2012 at 11:29:34AM -0400, rsa wrote:
>> Hi Ben
>> For L2TP that should work very well. But, with other tunnel types like GRE etc.
>> route lookups have to be done first in the inner and then outer.  It
>> makes it easier
>> to keep keep the tunnel in the inner namespace in such cases. right?
>
> I've read IPv4 gre code, and it appears to do the right thing on rx, but it 
> does *not* appear to handle namespaces correctly on transmit.  In general, 
> I would expect pretty much all code to get namespace handling correct for 
> the rx case.  I'll have a closer look at fixing this tomorrow if nobody else 
> beats me to it.

It will be interesting to see what you come up with. 

Eric
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