linux-kernel - Re: [PATCH linux-2.6 v2] IPv6: Create temporary address if none exists.

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Message-Id: <20100928.222510.71109554.davem@davemloft.net>
Date:	Tue, 28 Sep 2010 22:25:10 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gwurster@....carleton.ca
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, shemminger@...tta.com,
	eric.dumazet@...il.com, herbert@...dor.apana.org.au,
	ebiederm@...ssion.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH linux-2.6 v2] IPv6: Create temporary address if none
 exists.

From: Glenn Wurster <gwurster@....carleton.ca>
Date: Mon, 27 Sep 2010 13:04:30 -0400

> If privacy extentions are enabled, but no current temporary address exists,
> then create one when we get a router advertisement.
> 
> Version 2, now with 100% fewer line wraps.  Thanks to David Miller for
> pointing out the line wrapping issue.
> 
> Signed-off-by: Glenn Wurster <gwurster@....carleton.ca>

The existing code is correct from what I can tell.

Variable "create" is true when "ifp == NULL" and "valid_lft != 0"

And RFC 3041 explicitly states in section 3.3:

	When a new public address is created as described in [ADDRCONF]
	(because the prefix advertised does not match the prefix of any
	address already assigned to the interface, and Valid Lifetime
	in the option is not zero), also create a new temporary address.

Your patch is going to cause us to create a temporary address even
when valid_lft is zero, which the RFC says we should not do.

That goes against what the RFC tells us to do, so I can only conclude
that your patch is not correct.

I'm not applying this, sorry.

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