howto add protocol in "protocol control"

[speciall]

Hello,
I'm running a gameserver at the moment only for Call of Duty 4. Later it is possible that we add some more games.

How can I add COD4 or other games/programs protocol signatures to the protocol filter to monitor the traffic it's generating?

[Silver Bullet]

Well, here is a brief howto http://l7-filter.sourceforge.net/Pattern-HOWTO