Generic flags (PF_FilterFlags)
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FF_DONT_FILTER_IN
	Passthrough incoming objects without filtering.

FF_DONT_FILTER_OUT
	Passthrough outgoing objects without filtering.

FF_READ_ONLY_IN
	Filter incoming objects in read-only mode. The filters with this flag passthrough the incoming packets to destination immediately, and indicate classified objects with read-only flag.

FF_READ_ONLY_OUT
	Filter outgoing objects in read-only mode. The filters with this flag passthrough the outgoing packets to destination immediately, and indicate classified objects with read-only flag.