netdev - Re: [PATCH] net: clear iflink when moving to a new netns

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Date:	Wed, 12 Feb 2014 17:34:32 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH] net: clear iflink when moving to a new netns

On Wed, Feb 12, 2014 at 3:18 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> On Tue, 2014-02-11 at 15:51 -0800, Cong Wang wrote:
>> From: Cong Wang <cwang@...pensource.com>
>>
>> BZ: https://bugzilla.kernel.org/show_bug.cgi?id=66691
>>
>> macvlan and vlan both use iflink to identify its lower device,
>> however, after such device is moved to the new netns, its iflink
>> would become meaningless as ifindex is per netns. So, instead of
>> forbid them moving to another netns, just clear this field so that
>> it will not be dumped at least.
> [...]
>
> And what if it's moved back into the same netns?
>

Good point!

> I think iflink should be changed to a net_device pointer, so it remains
> valid for in-kernel users but rtnetlink can do the netns check before
> revealing it to userland.
>

I will try this approach.

Thanks.
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