netdev - Re: [PATCH 1/2] LSM: Add inet_sys_snd

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Date:	Thu, 03 Jan 2008 20:45:49 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paul.moore@...com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] LSM: Add inet_sys_snd_skb() LSM hook

From: Paul Moore <paul.moore@...com>
Date: Thu, 03 Jan 2008 12:25:39 -0500

> Add an inet_sys_snd_skb() LSM hook to allow the LSM to provide packet level
> access control for all outbound packets.  Using the existing postroute_last
> netfilter hook turns out to be problematic as it is can be invoked multiple
> times for a single packet, e.g. individual IPsec transforms, adding unwanted
> overhead and complicating the security policy.
> 
> Signed-off-by: Paul Moore <paul.moore@...com>

I disagree with this change.

The packet is different each time you see it in the postrouting hook,
and also the new hook is thus redundant.

If it's a performance issue and you can classify the security early,
mark the SKB as "seen" and then on subsequent hooks you can just
return immediately if that flag is set.
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