// ntddndis.h

typedef struct _OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY {
  UDP_ENCAP_TYPE UdpEncapType;
  USHORT         DstEncapPort;
} OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY, *POFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY;
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Windows Driver Kit DDI reference (ns-ntddndis-_offload_ipsec_udpesp_encaptype_entry)

_OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY structure

Description

The OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY structure specifies the UDP-ESP encapsulation type and destination port of a parser entry.

Members

`UdpEncapType`

The UDP-ESP encapsulation type for packets protected by the security associations (SAs) that are being offloaded:

IPSEC_UDPESP_ENCAPTYPE_IKE

This value is reserved.

IPSEC_UDPESP_E\NCAPTYPE_OTHER

UDP encapsulation for packets on port 4500. For more information, see UDP-ESP Encapsulation Types.

`DstEncapPort`

For an inbound SA (Flags = OFFLOAD_INBOUND_SA), specifies the destination port that the NIC should look for in the UDP header of inbound packets that it processes on the SAs being offloaded. The NIC should ignore this member for an outbound SA ( Flags = OFFLOAD_OUTBOUND_SA). DstEncapPort should always specify port 4500.

Remarks

The OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY structure is used with the OFFLOAD_IPSEC_ADD_UDPESP_SA structure.

OFFLOAD_IPSEC_UDPESP_ENCAPTYPE_ENTRY - NtDoc