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NdisIMCopySendPerPacketInfo

  • Article

This function copies per-packet information from a packet that was sent down by an upper-level driver into a new packet to be sent down to a lower miniport driver.

VOID NdisIMCopySendPerPacketInfo(
  PNDIS_PACKET DstPacket,
  PNDIS_PACKET SrcPacket
);

Parameters

  • DstPacket
    [in] Pointer to the destination packet descriptor in which per-packet information is to be copied.
  • SrcPacket
    [in] Pointer to the source packet descriptor from which per-packet information is copied.

Return Values

None.

Remarks

When an intermediate driver forwards a send request from an upper-level driver to a lower miniport driver, that intermediate driver calls NdisIMCopySendPerPacketInfo to copy per-packet information. The intermediate driver copies the per-packet information from a packet sent down by the upper-level driver into a new packet that the intermediate driver sends down to the lower miniport driver. The intermediate driver calls NdisIMCopySendPerPacketInfo for each packet sent down through the stack unless the intermediate driver must modify a packet's per-packet information.

Per-packet information is contained in an NDIS_PACKET_EXTENSION structure and includes, for example, checksum information, IP Security information, and 802.1p priority information.

If an intermediate driver must modify a packet's per-packet information, that intermediate driver can use either of the following macros to access the per-packet information:

  • NDIS_PER_PACKET_INFO_FROM_PACKET accesses a specific type of per-packet information in a packet. Use this macro to access only a single type of per-packet information for a packet.
  • NDIS_PACKET_EXTENSION_FROM_PACKET accesses all of the per-packet information in a packet. Use this macro to access more than one type of per-packet information for a packet.

To copy a range of data from one packet to another, use the NdisCopyFromPacketToPacket function.

Requirements

OS Versions: Windows CE .NET 4.0 and later.
Header: Ndis.h.

See Also

NdisCopyFromPacketToPacket | NdisIMCopySendCompletePerPacketInfo | NDIS_PACKET_EXTENSION | NDIS_PER_PACKET_INFO_FROM_PACKET | NDIS_PACKET_EXTENSION_FROM_PACKET

 Last updated on Tuesday, May 18, 2004

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