4 receive IOCTL device control code, the role is the beginning of filtration, filtering to stop, add the filter rules and clear the filtering rules. Each of these filtering rules defined by a self-described CIPFilter structure, specify how to treat a particular IP packet. Hook to deal with packet filtering, it is necessary to compare the rules for each user, and then act accordingly.

DrvFltIp
........\DrvFltIp.cpp
........\DrvFltIp.dsp
........\DrvFltIp.dsw
........\DrvFltIp.h
........\internal.h
........\Release
........\.......\DrvFltIp.sys

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