NetExtensionGetData function (extension.h)

Article
02/22/2024

The NetExtensionGetData function retrieves packet extension data for a net packet.

Syntax

void * NetExtensionGetData(
  NET_EXTENSION const *Extension,
  UINT32              Index
);

Parameters

Extension

A pointer to a NET_EXTENSION structure that describes the requested extension information for this packet queue.

Index

The index in the packet ring for the target NET_PACKET.

Return value

Returns a pointer to the structure that holds the extension information for this packet.

Remarks

Client drivers should not call this function directly. Instead, they should call the appropriate wrapper function for the type of extension they are getting:

For checksum offload information, the client driver calls NetExtensionGetPacketChecksum.
For Generic Segmentation Offload (GSO) information, the client driver calls NetExtensionGetPacketLso.
For Receive Segment Coalescence (RSC) offload information, the client driver calls NetExtensionGetPacketRsc.

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.29
Header	extension.h (include netadaptercx.h)
IRQL	Any level as long as target memory is resident