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Date:	Wed, 12 Feb 2014 23:18:25 +0000
From:	Ben Hutchings <>
To:	Cong Wang <>
Cc:, "David S. Miller" <>,
	"Eric W. Biederman" <>,
	Eric Dumazet <>,
	Hannes Frederic Sowa <>,
	Cong Wang <>
Subject: Re: [PATCH] net: clear iflink when moving to a new netns

On Tue, 2014-02-11 at 15:51 -0800, Cong Wang wrote:
> From: Cong Wang <>
> BZ:
> 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?

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.


Ben Hutchings
If more than one person is responsible for a bug, no one is at fault.

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