netdev - Re: [PATCH]: double SAs are created when using AH and ESP together

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Date:	Fri, 09 Mar 2007 16:20:27 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	latten@...tin.ibm.com
Cc:	netdev@...r.kernel.org, eparis@...hat.com,
	herbert@...dor.apana.org.au, jmorris@...ei.org, paul.moore@...com,
	vyekkirala@...stedCS.com
Subject: Re: [PATCH]: double SAs are created when using AH and ESP together

From: Joy Latten <latten@...tin.ibm.com>
Date: Fri, 9 Mar 2007 17:14:54 -0600

> I noticed that in xfrm_state_add we look for the larval SA in a few
> places without checking for protocol match. So when using both 
> AH and ESP, whichever one gets added first, deletes the larval SA. 
> It seems AH always gets added first and ESP is always the larval 
> SA's protocol since the xfrm->tmpl has it first. Thus causing the
> additional km_query()
> 
> Adding the check eliminates the double SA creation. 
> I know this may not seem like a complete solution and I will 
> continue to test and be on the lookout, but isn't having the
> check a good thing? So far I have tested SAs with just ESP, just AH
> and with both and all seems ok. 
> 
> Please let me know if this patch is ok. 
> My kernel was 2.6.20-rc3-git3.
> 
> Signed-off-by: Joy Latten <latten@...tin.ibm.com>

Generally it looks OK, but I'm going to let this one sit for
a while before I apply it so that other folks can review it
too and spot any unintended consequences.

In particular, I find it strance that we didn't check the
protocol field all this time and I wonder whether that might
be on purpose for some reason.
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