linux-kernel - Re: [PATCH] TCP: add option for silent port knocking with integrity protection

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Date:	Wed, 11 Dec 2013 13:25:22 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	Christian Grothoff <grothoff@...tum.de>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, knock@...net.org, jacob@...elbaum.net
Subject: Re: [PATCH] TCP: add option for silent port knocking with integrity protection

Stephen Hemminger <stephen@...workplumber.org> writes:
>
> The point is that doing it outside of TCP core is safer, less error prone
> and more flexible.

Or to put the question differently: what hooks would be needed to make
this efficiently work in user space?

It could be something like this: Firewall the port with forwarding the 
SYN packets using nfqueue, check for the SYN having the right magic,
change a firewall rule, re-inject using nfqueue (not fully sure how
well that works)

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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