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

[Andi Kleen]

Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx -- Speaking for myself only
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