block internet connection

Hello! I need your professional help! I and my friend are building a system to control internet access among users using Java. All users have existing accounts in the system. We have the following objectives:

1) allow the user to access the internet only if authenticated by the system, 2) monitor the total number of bytes used per user, 3) disconnect once the limit of allowed bytes is exceeded. The problem we encountered is on how to connect/disconnect a user from using the internet. What should we do! We're creating this system with openBSD 3.6 as server! Does openBSD pf necessary into this scenario? If yes, how? Pls reply!
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IveCal
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