UINT
EthNumberOfOpenFilterAddresses(
IN PETH_FILTER Filter,
IN NDIS_HANDLE NdisFilterHandle
);
EthNumberOfOpenFilterAddresses is called by the NIC driver to count the number of Ethernet filter library database multicast addresses in a binding filter.
EthNumberOfOpenFilterAddresses returns the number of multicast addresses in the binding filter.
A caller must be holding the database spin lock to call EthNumberOfOpenFilterAddresses, so the driver is running at IRQL DISPATCH_LEVEL.