netdev - Re: sockets affected by IPsec always block (2.6.23)

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Message-ID: <4765AAFC.3040406@tmr.com>
Date:	Sun, 16 Dec 2007 17:47:24 -0500
From:	Bill Davidsen <davidsen@....com>
To:	David Miller <davem@...emloft.net>
CC:	herbert@...dor.apana.org.au, simon@...e.lp0.eu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: sockets affected by IPsec always block (2.6.23)

David Miller wrote:
> From: Herbert Xu <herbert@...dor.apana.org.au>
> Date: Wed, 5 Dec 2007 11:12:32 +1100
> 
>> [INET]: Export non-blocking flags to proto connect call
>>
>> Previously we made connect(2) block on IPsec SA resolution.  This is
>> good in general but not desirable for non-blocking sockets.
>>
>> To fix this properly we'd need to implement the larval IPsec dst stuff
>> that we talked about.  For now let's just revert to the old behaviour
>> on non-blocking sockets.
>>
>> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> 
> We made an explicit decision not to do things this way.
> 
> Non-blocking has a meaning dependant upon the xfrm_larval_drop sysctl
> setting, and this is across the board.  If xfrm_larval_drop is zero,
> non-blocking semantics do not extend to IPSEC route resolution,
> otherwise it does.
> 
> If he sets this sysctl to "1" as I detailed in my reply, he'll
> get the behavior he wants.
> 
I think you for the hint, but I would hardly call this sentence 
"detailed" in terms of being a cookbook solution to the problem.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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