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