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Accessing Per-Packet Information from an Intermediate Driver (NDIS 5.1)

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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 x has been deprecated and is superseded by NDIS 6.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 per-packet information includes items such as checksum, security and priority information. Intermediate drivers should use the NDIS_PER_PACKET_INFO_FROM_PACKETmacro to retrieve per-packet out-of-band (OOB) data. NDIS_PER_PACKET_INFO_FROM_PACKET returns a pointer to a specific type of per-packet information associated with a packet descriptor. For more information about per-packet information, see Accessing Per-Packet Information.

If NDIS indicates data to an intermediate driver's ProtocolReceivefunction, the intermediate driver calls NdisGetReceivedPacketand NDIS_GET_ORIGINAL_PACKETto retrieve the original packet.

The intermediate driver can obtain information from the OOB data associated with the packet, using NDIS-supplied macros as follows:

  • Media-specific information is read using NDIS_GET_MEDIA_SPECIFIC_INFO, and written using NDIS_SET_MEDIA_SPECIFIC_INFO

  • TimeSent is read using NDIS_GET_TIME_SENT, and written using NDIS_SET_TIME_TO_SEND

  • TimeReceived is read using NDIS_GET_TIME_RECEIVED

Note   Most miniport drivers do not support TimeSent and TimeReceived.

 

 

 

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