Useful addition to ipfw

Hello,

I've found myself in a situation where a simple data inspection  
capability added to ipfw would be very useful.

I'm not thinking about anything especially sophisticated, but what  
about adding an option to check byte values (or flags, similar to  
tcpdump)?

An example rule could be: add deny udp from any to me 12345 udp[4]&234

being the rule true if byte 4 in the UDP packet AND the number 234 is  
not zero.

P.S: I'm thinking about controlling some types of UDP packets than  
can be identified by simple flags present in the packet data.

Opinions?

Borja.

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