IPTables and QOS

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Hello People,   I'd like to know if it is at all possible to filter (generate bandwith logs) for each (internal) IP on a LAN ? The idea is that someone is sharing an internet connection but does not want his transfer block to run out before the end of the month with someone else using up all of the bytes. Thus there is some need to keep track of the amount of data a single IP has used allready.   I thought about using QOS (iproute / tc) but, as far as i could find out by now, iproute/tc do not seem to provide such single-ip monitorig feature.     Regards,   Joris