netdev - Re: [PATCH 3/4] xfrm: remove policy lock when accessing policy->walk.dead

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Message-ID: <20100331132622.GA13908@gondor.apana.org.au>
Date:	Wed, 31 Mar 2010 21:26:23 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	jamal <hadi@...erus.ca>
Cc:	Timo Teras <timo.teras@....fi>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3/4] xfrm: remove policy lock when accessing
	policy->walk.dead

On Wed, Mar 31, 2010 at 09:11:31PM +0800, Herbert Xu wrote:
> 
> > This is a consistent definition of the semantics everywhere tables
> > are flushed (not just in Linux)..
> 
> Please give specific examples in the kernel.

In fact the previous behaviour is also consistent with RFC2367:

3.1.9 SADB_FLUSH

   The SADB_FLUSH message causes the kernel to delete all entries in its
   key table for a certain sadb_msg_satype.  Only the base header is
   required for a flush message.  If sadb_msg_satype is filled in with a
   specific value, only associations of that type are deleted.  If it is
   filled in with SADB_SATYPE_UNSPEC, ALL associations are deleted.

     The messaging behavior for SADB_FLUSH is:

           Send an SADB_FLUSH message from a user process to the kernel.

           <base>

           The kernel will return an SADB_FLUSH message to all listening
           sockets.

           <base>

           The reply message happens only after the actual flushing
           of security associations has been attempted.

There is no special treatment for an empty DB.

Please send a revert.

Thanks,
-- 
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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