From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Vehent <julien@linuxwall.info>
Subject: Re: Packet manipulation in user space
Date: Thu, 08 Apr 2010 22:52:10 +0200
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To: Hamid Nassiby <h.nassiby@gmail.com>
Cc: netfilter <netfilter@vger.kernel.org>

On Thu, 8 Apr 2010 23:24:09 +0430, Hamid Nassiby <h.nassiby@gmail.com>
wrote:
> Capture each packet which is coming inside or going outside the
> computer in Data-link Layer.
> Create a copy of the packet and drop the original one.
> Copy of packet must be available in user space to be manipulated by
> our protocol.
> After manipulation in user space, inject encrypted/decrypted version
> of the privileged (copy of) packets to the network or upward to the
> application layer.
> 

libnetfilter_queue ?

http://www.netfilter.org/projects/libnetfilter_queue/index.html