From mboxrd@z Thu Jan  1 00:00:00 1970
From: Patrick McHardy <kaber@trash.net>
Subject: Re: libipq does not shorten package
Date: Thu, 09 Mar 2006 16:55:35 +0100
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To: David Vogt <beunlovable@gmail.com>
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David Vogt wrote:
> Dear all,
> 
> I already posted this question on netfilter mailing list, however, I
> got no response, so maybe someone around here can help me.
> 
> I am using iptables and queue packets to user space. Packets are
> either augmented (with a signature) or shortened (removal of
> signature). The augmentation works.
>  However, when removing the signature, the resulting packet contains
> the correct data, but its overall size is equal to the original
> (signed) packet. (i.e. original packet size: 83, signed packet size:
> 163)

Thomas Graf posted a patch that should fix this a couple of days
ago, check the list archives.