netdev - [0/4] Fix addrconf race conditions

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Date:	Tue, 18 May 2010 21:02:43 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	jbohac@...e.cz, yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
	shemminger@...tta.com
Subject: [0/4] Fix addrconf race conditions

On Fri, Apr 23, 2010 at 11:05:40PM +0800, Herbert Xu wrote:
>
> This stuff is more broken than I thought.  For example, we perform
> a number of actions when DAD succeeds, e.g., joining an anycast
> group.  However, this is not synchronised with respect to address
> deletion at all, so if DAD succeeds just as someone deletes the
> address, you can easily get stuck on that anycast group.
> 
> I will try to untangle this mess tomorrow.

Tomorrow took a while to arrive :)

Here is a first batch of patches.  Note that this is by no means
a comprehensive fix for all the ndisc/addrconf race conditions.
It is just a first step in trying to address the problems.

The patchset revolves around a new lock, ifp->state_lock.  I
added it instead of trying to reuse the existing ifp->lock because
the latter has serious nesting issues that prevent it from easily
being used.  My long term plan is to restructure the locking and
eventually phase out ifp->lock in favour of ifp->state_lock.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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