netdev - Re: [PATCH net-next] ipvlan: use pernet operations and restrict l3s hooks to master netns

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Date:   Tue, 25 Apr 2017 10:43:49 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     fw@...len.de
Cc:     netdev@...r.kernel.org, maheshb@...gle.com
Subject: Re: [PATCH net-next] ipvlan: use pernet operations and restrict
 l3s hooks to master netns

From: Florian Westphal <fw@...len.de>
Date: Thu, 20 Apr 2017 18:08:15 +0200

> commit 4fbae7d83c98c30efc ("ipvlan: Introduce l3s mode") added
> registration of netfilter hooks via nf_register_hooks().
> 
> This API provides the illusion of 'global' netfilter hooks by placing the
> hooks in all current and future network namespaces.
> 
> In case of ipvlan the hook appears to be only needed in the namespace
> that contains the ipvlan master device (i.e., usually init_net), so
> placing them in all namespaces is not needed.
> 
> This switches ipvlan driver to pernet operations, and then only registers
> hooks in namespaces where a ipvlan master device is set to l3s mode.
> 
> Extra care has to be taken when the master device is moved to another
> namespace, as we might have to 'move' the netfilter hooks too.
> 
> This is done by storing the namespace the ipvlan port was created in.
> On REGISTER event, do (un)register operations in the old/new namespaces.
> 
> This will also allow removal of the nf_register_hooks() in a future patch.
> 
> Cc: Mahesh Bandewar <maheshb@...gle.com>
> Signed-off-by: Florian Westphal <fw@...len.de>

Applied, thanks Florian.