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

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Date:	Wed, 12 Feb 2014 16:43:22 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
CC:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Cong Wang <cwang@...pensource.com>
Subject: Re: [PATCH] net: clear iflink when moving to a new netns

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.
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