_TRANSPORT_LAYER_FILTER

struct _TRANSPORT_LAYER_FILTER
{
 	unsigned long m_dwUnionSelector;
 	union
 	{
  		TCPUDP_FILTER m_TcpUdp;
 	};
};

This structure represents transport layer (OSI-7) filter level.

m_dwUnionSelector
Specifies which of the union members below is valid. Currently only TCP and UDP are supported and this field should be always set to TCPUDP.

m_TcpUdp
TCP/UDP port filter