netdev - Re: Network Namespace status

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Message-Id: <20070916.153643.13760549.davem@davemloft.net>
Date:	Sun, 16 Sep 2007 15:36:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	containers@...ts.osdl.org, netdev@...r.kernel.org,
	htejun@...il.com, gregkh@...e.de, akpm@...ux-foundation.org
Subject: Re: Network Namespace status

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Thu, 13 Sep 2007 13:12:08 -0600

> The final blocker to having multiple useful instances of network
> namespaces is the loopback device.  We recognize the network namespace
> of incoming packets by looking at dev->nd_net.  Which means for
> packets to properly loopback within a network namespace we need a
> loopback device per network namespace.  There were some concerns
> expressed when we posted the cleanup part of the patches that allowed
> for multiple loopback devices a few weeks ago so resolving this one
> may be tricky.

There was a change posted recently to dynamically allocate the
loopback device.  I like that (sorry I don't have a reference
to the patch handy), and you can build on top of that to get
the namespace local loopback objects you want.

static struct net_device *loopback_dev(struct net_namespace *net)
{
	...
}

You get the idea.
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