Matching DNAT'd packets

[Philip Prindeville <philipp_subx@xxxxxxxxxxxxxxxxxxxxx>]

I've got the following scenario:

iptables -t nat -A PREROUTING -i $EXTIF -p tcp --dport 8080 -j DNAT --to-destination :80


but later in the INPUT chain, I'd like to be able to distinguish between
a packet that came in directly to port 80 (which I'd reject) versus a
packet that came in to a different port (like 8080 above) and was
remapped... which I'd like to accept.

Is there a test to available in INPUT (and FORWARD) see if the packet
had been rewritten in the PREROUTING chain?

Thanks,

-Philip

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