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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH 1/2] LSM: Add inet_sys_snd_skb() LSM hook
Date: Fri, 04 Jan 2008 13:09:02 -0800 (PST)
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From: Paul Moore <paul.moore@hp.com>
Date: Fri, 4 Jan 2008 09:38:27 -0500

> Unfortunately, it's not quite that easy at present.  The only field we 
> have in the skb where we could possibly set a flag is the secmark field 
> which is already taken.

Herbert Xu added a "peeked" field in net-2.6.25 that is only used on
input while processing socket receive queues.  You could use it on
output.