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Date: Wed, 28 Nov 2001 05:41:12 -0800 (PST)
Message-Id: <20011128.054112.77872977.davem@redhat.com>
To: root@chaos.analogic.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: Magic Lantern
From: "David S. Miller" <davem@redhat.com>
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   From: "Richard B. Johnson" <root@chaos.analogic.com>
   Date: Wed, 28 Nov 2001 08:36:33 -0500 (EST)
   
   Yes, I know a module could be written, but I wonder if the
   capability already exists.

I'm pretty sure netfilter (at least at one point) allows
exactly what you describe.  Packet filters can be written
in userspace.
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