netdev - Re: [patch net-next 2/2] ipv6 addrconf: introduce IFA_F_MANAGETEMPADDR to tell kernel to manage temporary addresses

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Message-ID: <20131207033616.GB16799@order.stressinduktion.org>
Date:	Sat, 7 Dec 2013 04:36:16 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	thaller@...hat.com, stephen@...workplumber.org,
	vyasevich@...il.com, dcbw@...hat.com, David.Laight@...LAB.COM,
	fx.lebail@...oo.com
Subject: Re: [patch net-next 2/2] ipv6 addrconf: introduce IFA_F_MANAGETEMPADDR to tell kernel to manage temporary addresses

Hi Jiri!

On Fri, Dec 06, 2013 at 09:45:22AM +0100, Jiri Pirko wrote:
> Creating an address with this flag set will result in kernel taking care
> of temporary addresses in the same way as if the address was created by
> kernel itself (after RA receive). This allows userspace applications
> implementing the autoconfiguration (NetworkManager for example) to
> implement ipv6 addresses privacy.

I think we should follow up on something François-Xavier Le Bail proposed
here:

http://patchwork.ozlabs.org/patch/294029/

In general I like the idea, and I also agree with David, we should disable
it by default. But this would be beneficial to NetworkManager to not need
to set temp_addresses to 2 to have them used by default. I guess a netlink
api and a per-interface flag would be the easiest thing for NM to handle?

Greetings,

  Hannes

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