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

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Message-Id: <20071216.152235.213233734.davem@davemloft.net>
Date:	Sun, 16 Dec 2007 15:22:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	davidsen@....com
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)

From: Bill Davidsen <davidsen@....com>
Date: Sun, 16 Dec 2007 17:47:24 -0500

> 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.

I guess "echo '1' >/proc/sys/net/core/xfrm_larval_drop" is not
explicit enough?  What more would you like me to say?
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