netdev - Re: [PATCH] ipv6 addrconf: source address selection, Rule 7: Prefer temporary addresses (RFC 6724)

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Message-ID: <20131126085404.GA20630@order.stressinduktion.org>
Date:	Tue, 26 Nov 2013 09:54:04 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	fx.lebail@...oo.com
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, dcbw@...hat.com,
	jiri@...nulli.us
Subject: Re: [PATCH] ipv6 addrconf: source address selection, Rule 7: Prefer temporary addresses (RFC 6724)

[Added Jiri and Dan]

On Mon, Nov 25, 2013 at 05:16:45PM +0100, fx.lebail@...oo.com wrote:
> The RFC 6724 change the default recommendation for source address selection
> Rule 7 to prefer temporary addresses rather than public addresses,
> while providing an administrative override.
> 
> The administrative override is based on the prefer_src_public sysctl.

I like the idea and it could be useful in addition to the new
IFA_F_MANAGETEMPADDR flag which should show up any time soon.

With IFA_F_MANAGETEMPADDR iproute/netlink could add a public address
and indicate the kernel it should also generate a new temporary address
without touching the use_tempaddr knob. So there is no possiblity to
change the priority of public and temporary addresses any more. This
patch could restore that.

A netconf API for this would be nice, too.

Jiri, Dan do you agree?

Greetings,

  Hannes

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