Hi,

This patch follows from:
http://patchwork.netfilter.org/netfilter-devel/patch.pl?id=3722

I have rework the patch based on Yasuyuki's and Patrick's comments.

-- 
The dawn of the fourth age of Linux firewalling is coming; a time of 
great struggle and heroic deeds -- J.Kadlecsik got inspired by J.Morris