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

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Date:	Wed, 12 Feb 2014 17:18:08 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
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 7:43 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
> Le 12/02/2014 00:51, Cong Wang a écrit :
>
>> 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.
>>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Eric W. Biederman <ebiederm@...ssion.com>
>> Cc: Eric Dumazet <eric.dumazet@...il.com>
>> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>,
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>> Signed-off-by: Cong Wang <cwang@...pensource.com>
>
> I wonder if this patch breaks things in ip tunnels.
> For example, ip6_tunnel uses iflink to find tunnels that are bound to an
> interface.
> If you reset this field, ipip6_tunnel_lookup() will fail when the tunnel
> moves
> to another netns.

Most tunnels set NETIF_F_NETNS_LOCAL, ip6_tunnel should set it too
(need a patch). So this is not a problem.
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