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SubjectRe: sockets affected by IPsec always block (2.6.23)
From: Herbert Xu <>
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 <>

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.

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