NDIS_GET_PACKET_PROTOCOL_TYPE function

Note NDIS 5. x has been deprecated and is superseded by NDIS 6. x. For new NDIS driver development, see Network Drivers Starting with Windows Vista. For information about porting NDIS 5. x drivers to NDIS 6. x, see Porting NDIS 5.x Drivers to NDIS 6.0.

NDIS_GET_PACKET_PROTOCOL_TYPE returns the protocol ID associated with a given packet descriptor.

Syntax

UINT NDIS_GET_PACKET_PROTOCOL_TYPE(
  _In_ PNDIS_PACKET Packet
);

Parameters

Packet [in]
Pointer to a packet descriptor.

Return value

NDIS_GET_PACKET_PROTOCOL_TYPE returns the protocol ID associated with a given packet descriptor as one of the following values:

Return code	Description
NDIS_PROTOCOL_ID_DEFAULT	Unspecified
NDIS_PROTOCOL_ID_TCP_IP	TCP/IP
NDIS_PROTOCOL_ID_IPX	IPX
NDIS_PROTOCOL_ID_NBF	NetBEUI

Remarks

Drivers can test the Protocol ID associated with a packet descriptor to determine whether to perform an operation on a packet. For example, before passing a TCP/IP checksum operation to its NIC, a miniport driver could test the Protocol ID associated with a packet descriptor. If the Protocol ID is not NDIS_PROTOCOL_ID_TCP_IP, the miniport driver's NIC should not perform checksum operations on the associated packet.

Requirements

Target platform	Desktop
Header	Ndis.h (include Ndis.h)
IRQL	<= DISPATCH_LEVEL