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913 lines
28 KiB
913 lines
28 KiB
/////////////////////////////////////////////////////////
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//
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// Copyright (c) 2001 Microsoft Corporation
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//
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// Module Name:
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// receive
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//
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// Abstract:
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// This module contains code which deals with receiving data
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//
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//////////////////////////////////////////////////////////
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#include "sysvars.h"
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//////////////////////////////////////////////////////////////
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// private constants, types, and prototypes
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//////////////////////////////////////////////////////////////
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const PCHAR strFunc1 = "TSReceive";
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const PCHAR strFunc2 = "TSReceiveHandler";
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const PCHAR strFunc3 = "TSRcvExpeditedHandler";
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const PCHAR strFunc4 = "TSChainedReceiveHandler";
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const PCHAR strFunc5 = "TSChainedRcvExpeditedHandler";
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const PCHAR strFuncP1 = "TSReceiveComplete";
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const PCHAR strFuncP2 = "TSShowReceiveInfo";
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const PCHAR strFuncP3 = "TSGetRestOfData";
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const PCHAR strFuncP4 = "TSCommonReceive";
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const PCHAR strFuncP5 = "TSCommonChainedReceive";
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//
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// completion context
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//
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struct RECEIVE_CONTEXT
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{
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PMDL pLowerMdl; // mdl from lower irp
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PRECEIVE_DATA pReceiveData; // above structure
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PADDRESS_OBJECT pAddressObject;
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BOOLEAN fIsExpedited;
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};
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typedef RECEIVE_CONTEXT *PRECEIVE_CONTEXT;
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//
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// completion function
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//
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TDI_STATUS
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TSReceiveComplete(
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PDEVICE_OBJECT DeviceObject,
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PIRP Irp,
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PVOID Context
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);
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PIRP
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TSGetRestOfData(
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PADDRESS_OBJECT pAddressObject,
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PRECEIVE_DATA pReceiveData,
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BOOLEAN fIsExpedited
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);
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VOID
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TSShowReceiveInfo(
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PADDRESS_OBJECT pAddressObject,
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CONNECTION_CONTEXT ConnectionContext,
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ULONG ulReceiveFlags,
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ULONG ulBytesIndicated,
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ULONG ulBytesAvailable,
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PVOID pvTsdu,
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BOOLEAN fIsChained
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);
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TDI_STATUS
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TSCommonReceive(
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PADDRESS_OBJECT pAddressObject,
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ULONG ulBytesTotal,
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ULONG ulBytesIndicated,
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ULONG ulReceiveFlags,
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PVOID pvTsdu,
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BOOLEAN fIsExpedited,
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PULONG pulBytesTaken,
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PIRP *pIoRequestPacket
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);
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TDI_STATUS
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TSCommonChainedReceive(
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PADDRESS_OBJECT pAddressObject,
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ULONG ulReceiveLength,
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ULONG ulStartingOffset,
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PMDL pReceiveMdl,
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BOOLEAN fIsExpedited,
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PVOID pvTsduDescriptor
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);
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//////////////////////////////////////////////////////////////
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// public functions
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//////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------
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//
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// Function: TSReceive
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//
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// Arguments: pEndpointObject -- current endpoint
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// pIrp -- completion information
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//
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// Returns: NTSTATUS (normally pending)
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//
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// Descript: This function receives data over a connection
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//
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// ----------------------------------------------------------------------------
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NTSTATUS
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TSReceive(PENDPOINT_OBJECT pEndpoint,
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PSEND_BUFFER pSendBuffer,
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PRECEIVE_BUFFER pReceiveBuffer)
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{
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PADDRESS_OBJECT pAddressObject = pEndpoint->pAddressObject;
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//
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// assume no packet
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//
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pReceiveBuffer->RESULTS.RecvDgramRet.ulBufferLength = 0;
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if (pAddressObject)
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{
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PRECEIVE_DATA pReceiveData;
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//
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// just get the first packet from the queue
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// check expedited list First
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//
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TSAcquireSpinLock(&pAddressObject->TdiSpinLock);
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pReceiveData = pAddressObject->pHeadRcvExpData;
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if (pReceiveData)
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{
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//
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// fix up the lists as necessary
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//
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if (pReceiveData->pNextReceiveData)
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{
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pReceiveData->pNextReceiveData->pPrevReceiveData = NULL;
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}
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else
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{
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pAddressObject->pTailRcvExpData = NULL;
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}
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pAddressObject->pHeadRcvExpData = pReceiveData->pNextReceiveData;
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}
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//
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// if no expedited receives, check normal list
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//
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else
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{
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pReceiveData = pAddressObject->pHeadReceiveData;
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if (pReceiveData)
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{
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//
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// fix up the lists as necessary
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//
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if (pReceiveData->pNextReceiveData)
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{
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pReceiveData->pNextReceiveData->pPrevReceiveData = NULL;
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}
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else
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{
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pAddressObject->pTailReceiveData = NULL;
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}
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pAddressObject->pHeadReceiveData = pReceiveData->pNextReceiveData;
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}
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}
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TSReleaseSpinLock(&pAddressObject->TdiSpinLock);
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//
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// if we got a packet to return, then lets return it..
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// and release its memory
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//
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if (pReceiveData)
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{
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//
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// show debug, if it is turned on, and only if we actually
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// are returning a packet
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//
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if (ulDebugLevel & ulDebugShowCommand)
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{
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DebugPrint1("\nCommand = ulRECEIVE\n"
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"FileObject = %p\n",
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pEndpoint);
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}
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if (pReceiveData->ulBufferLength > pSendBuffer->COMMAND_ARGS.SendArgs.ulBufferLength)
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{
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pReceiveData->ulBufferLength = pSendBuffer->COMMAND_ARGS.SendArgs.ulBufferLength;
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}
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//
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// attempt to lock down the memory
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//
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PMDL pMdl = TSMakeMdlForUserBuffer(pSendBuffer->COMMAND_ARGS.SendArgs.pucUserModeBuffer,
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pReceiveData->ulBufferLength,
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IoModifyAccess);
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if (pMdl)
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{
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RtlCopyMemory(MmGetSystemAddressForMdl(pMdl),
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pReceiveData->pucDataBuffer,
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pReceiveData->ulBufferLength);
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TSFreeUserBuffer(pMdl);
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}
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else
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{
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pReceiveData->ulBufferLength = 0;
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}
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pReceiveBuffer->RESULTS.RecvDgramRet.ulBufferLength = pReceiveData->ulBufferLength;
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TSFreeMemory(pReceiveData->pucDataBuffer);
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TSFreeMemory(pReceiveData);
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}
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}
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return STATUS_SUCCESS;
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}
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// -----------------------------------------------
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//
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// Function: TSReceiveHandler
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//
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// Arguments: pvTdiEventContext -- really pointer to our AddressObject
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// Connection_Context -- really pointer to our Endpoint
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// ReceiveFlags -- nature of received data
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// ulBytesIndicated --- length of data in buffer
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// ulBytesTotal -- total length of datagram
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// pulBytesTaken -- stuff with bytes used by this driver
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// pvTsdu -- data buffer
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// pIoRequestPacket -- pIrp in case not all data received
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//
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// Returns: STATUS_DATA_NOT_ACCEPTED (we didn't want data)
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// STATUS_SUCCESS (we used all data & are done with it)
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// STATUS_MORE_PROCESSING_REQUIRED -- we supplied an IRP for rest
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//
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// Descript: Event handler for incoming receives on connection
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//
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// -----------------------------------------------
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TDI_STATUS
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TSReceiveHandler(PVOID pvTdiEventContext,
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CONNECTION_CONTEXT ConnectionContext,
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ULONG ulReceiveFlags,
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ULONG ulBytesIndicated,
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ULONG ulBytesTotal,
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PULONG pulBytesTaken,
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PVOID pvTsdu,
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PIRP *ppIoRequestPacket)
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{
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PADDRESS_OBJECT pAddressObject = (PADDRESS_OBJECT)pvTdiEventContext;
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if (ulDebugLevel & ulDebugShowHandlers)
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{
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DebugPrint1("\n >>>> %s\n", strFunc2);
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TSShowReceiveInfo(pAddressObject,
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ConnectionContext,
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ulReceiveFlags,
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ulBytesIndicated,
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ulBytesTotal,
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pvTsdu,
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FALSE);
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}
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return TSCommonReceive(pAddressObject,
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ulBytesTotal,
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ulBytesIndicated,
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ulReceiveFlags,
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pvTsdu,
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((ulReceiveFlags & TDI_RECEIVE_EXPEDITED) != 0),
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pulBytesTaken,
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ppIoRequestPacket);
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}
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// -----------------------------------------------
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//
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// Function: TSRcvExpeditedHandler
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//
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// Arguments: pvTdiEventContext -- really pointer to our AddressObject
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// Connection_Context -- really pointer to our Endpoint
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// ReceiveFlags -- nature of received data
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// ulBytesIndicated --- length of data in buffer
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// ulBytesTotal -- total length of datagram
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// pulBytesTaken -- stuff with bytes used by this driver
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// pvTsdu -- data buffer
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// pIoRequestPacket -- pIrp in case not all data received
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//
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// Returns: STATUS_DATA_NOT_ACCEPTED (we didn't want data)
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// STATUS_SUCCESS (we used all data & are done with it)
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// STATUS_MORE_PROCESSING_REQUIRED -- we supplied an IRP for rest
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//
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// Descript: Event handler for incoming expedited receives on connection
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//
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// -----------------------------------------------
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TDI_STATUS
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TSRcvExpeditedHandler(PVOID pvTdiEventContext,
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CONNECTION_CONTEXT ConnectionContext,
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ULONG ulReceiveFlags,
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ULONG ulBytesIndicated,
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ULONG ulBytesTotal,
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PULONG pulBytesTaken,
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PVOID pvTsdu,
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PIRP *ppIoRequestPacket)
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{
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PADDRESS_OBJECT pAddressObject = (PADDRESS_OBJECT)pvTdiEventContext;
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if (ulDebugLevel & ulDebugShowHandlers)
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{
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DebugPrint1("\n >>>> %s\n", strFunc3);
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TSShowReceiveInfo(pAddressObject,
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ConnectionContext,
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ulReceiveFlags,
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ulBytesIndicated,
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ulBytesTotal,
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pvTsdu,
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FALSE);
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}
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return TSCommonReceive(pAddressObject,
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ulBytesTotal,
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ulBytesIndicated,
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ulReceiveFlags,
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pvTsdu,
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TRUE,
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pulBytesTaken,
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ppIoRequestPacket);
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}
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// -----------------------------------------------
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//
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// Function: TSChainedReceiveHandler
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//
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// Arguments: pvTdiEventContext -- really pointer to our AddressObject
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// Connection_Context -- really pointer to our Endpoint
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// ReceiveFlags -- nature of received data
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// ulReceiveLength --- length of data in buffer
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// ulStartingOffset -- total length of datagram
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// pReceiveMdl -- data buffer
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// pTsduDescriptor -- returns value for TdiReturnChainedReceives
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//
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// Returns: STATUS_DATA_NOT_ACCEPTED (we didn't want data)
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// STATUS_SUCCESS (we used all data & are done with it)
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// STATUS_MORE_PROCESSING_REQUIRED -- we supplied an IRP for rest
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//
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// Descript: Event handler for incoming receives on connection
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//
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// -----------------------------------------------
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TDI_STATUS
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TSChainedReceiveHandler(PVOID pvTdiEventContext,
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CONNECTION_CONTEXT ConnectionContext,
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ULONG ulReceiveFlags,
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ULONG ulReceiveLength,
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ULONG ulStartingOffset,
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PMDL pReceiveMdl,
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PVOID pvTsduDescriptor)
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{
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PADDRESS_OBJECT pAddressObject = (PADDRESS_OBJECT)pvTdiEventContext;
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if (ulDebugLevel & ulDebugShowHandlers)
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{
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DebugPrint1("\n >>>> %s\n", strFunc4);
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TSShowReceiveInfo(pAddressObject,
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ConnectionContext,
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ulReceiveFlags,
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ulReceiveLength,
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ulStartingOffset,
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pReceiveMdl,
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TRUE);
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}
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return TSCommonChainedReceive(pAddressObject,
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ulReceiveLength,
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ulStartingOffset,
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pReceiveMdl,
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((ulReceiveFlags & TDI_RECEIVE_EXPEDITED) != 0),
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pvTsduDescriptor);
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}
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// -----------------------------------------------
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//
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// Function: TSChainedRcvExpeditedHandler
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//
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// Arguments: pvTdiEventContext -- really pointer to our AddressObject
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// Connection_Context -- really pointer to our Endpoint
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// ReceiveFlags -- nature of received data
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// ulReceiveLength --- length of data in buffer
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// ulStartingOffset -- total length of datagram
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// pReceiveMdl -- data buffer
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// pTsduDescriptor -- returns value for TdiReturnChainedReceives
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//
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// Returns: STATUS_DATA_NOT_ACCEPTED (we didn't want data)
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// STATUS_SUCCESS (we used all data & are done with it)
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// STATUS_MORE_PROCESSING_REQUIRED -- we supplied an IRP for rest
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//
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// Descript: Event handler for incoming receives on connection
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//
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// -----------------------------------------------
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TDI_STATUS
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TSChainedRcvExpeditedHandler(PVOID pvTdiEventContext,
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CONNECTION_CONTEXT ConnectionContext,
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ULONG ulReceiveFlags,
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ULONG ulReceiveLength,
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ULONG ulStartingOffset,
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PMDL pReceiveMdl,
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PVOID pvTsduDescriptor)
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{
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PADDRESS_OBJECT pAddressObject = (PADDRESS_OBJECT)pvTdiEventContext;
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if (ulDebugLevel & ulDebugShowHandlers)
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{
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DebugPrint1("\n >>>> %s\n", strFunc5);
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TSShowReceiveInfo(pAddressObject,
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ConnectionContext,
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ulReceiveFlags,
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ulReceiveLength,
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ulStartingOffset,
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pReceiveMdl,
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TRUE);
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}
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return TSCommonChainedReceive(pAddressObject,
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ulReceiveLength,
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ulStartingOffset,
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pReceiveMdl,
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TRUE,
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pvTsduDescriptor);
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}
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/////////////////////////////////////////////////////////////
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// private functions
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/////////////////////////////////////////////////////////////
|
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// ---------------------------------------------------------
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//
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// Function: TSReceiveComplete
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//
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// Arguments: pDeviceObject -- device object that called Receive/Datagram
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// pIrp -- IRP used in the call
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// pContext -- context used for the call
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//
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// Returns: status of operation (STATUS_MORE_PROCESSING_REQUIRED)
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//
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// Descript: Gets the result of the receive, stuffs result into
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// receive buffer, completes the IRP from the dll, and
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// cleans up the Irp and associated data from the receive
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//
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// ---------------------------------------------------------
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#pragma warning(disable: UNREFERENCED_PARAM)
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|
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TDI_STATUS
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TSReceiveComplete(PDEVICE_OBJECT pDeviceObject,
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PIRP pLowerIrp,
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PVOID pvContext)
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{
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PRECEIVE_CONTEXT pReceiveContext = (PRECEIVE_CONTEXT)pvContext;
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NTSTATUS lStatus = pLowerIrp->IoStatus.Status;
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ULONG ulBytesCopied = (ULONG)pLowerIrp->IoStatus.Information;
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PADDRESS_OBJECT pAddressObject = pReceiveContext->pAddressObject;
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PRECEIVE_DATA pReceiveData = pReceiveContext->pReceiveData;
|
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|
|
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if (NT_SUCCESS(lStatus))
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{
|
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if (ulDebugLevel & ulDebugShowCommand)
|
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{
|
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DebugPrint2("%s: %u BytesCopied\n",
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strFuncP1,
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ulBytesCopied);
|
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}
|
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pReceiveData->ulBufferUsed += ulBytesCopied;
|
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if (pReceiveData->ulBufferUsed >= pReceiveData->ulBufferLength)
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{
|
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TSPacketReceived(pAddressObject,
|
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pReceiveData,
|
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pReceiveContext->fIsExpedited);
|
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}
|
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else
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{
|
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DebugPrint1("%s: Data Incomplete\n", strFuncP1);
|
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TSFreeMemory(pReceiveData->pucDataBuffer);
|
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TSFreeMemory(pReceiveData);
|
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}
|
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}
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else
|
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{
|
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DebugPrint2("%s: Completed with status 0x%08x\n",
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strFuncP1,
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lStatus);
|
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TSFreeMemory(pReceiveData->pucDataBuffer);
|
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TSFreeMemory(pReceiveData);
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}
|
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|
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//
|
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// now cleanup
|
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//
|
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TSFreeIrp(pLowerIrp, pAddressObject->pIrpPool);
|
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TSFreeBuffer(pReceiveContext->pLowerMdl);
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|
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TSFreeMemory(pReceiveContext);
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return TDI_MORE_PROCESSING;
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}
|
|
|
|
#pragma warning(default: UNREFERENCED_PARAM)
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|
|
|
|
|
// ---------------------------------
|
|
//
|
|
// Function: TSShowReceiveInfo
|
|
//
|
|
// Arguments: pAddressObject -- the address object associated with this endpoint
|
|
// ConnectionContext -- endpoint of this connection
|
|
// ulReceiveFlags -- info about the receive
|
|
// ulBytesIndicated -- bytes indicated up
|
|
// ulBytesAvailable -- total bytes (or starting offset)
|
|
// pvTsdu -- ptr to the data (or to its mdl)
|
|
// fIsChained -- if TRUE, then this is chained receive
|
|
//
|
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// Returns: none
|
|
//
|
|
// Descript: shows info passed to receive handler
|
|
//
|
|
// --------------------------------
|
|
|
|
VOID
|
|
TSShowReceiveInfo(PADDRESS_OBJECT pAddressObject,
|
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CONNECTION_CONTEXT ConnectionContext,
|
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ULONG ulReceiveFlags,
|
|
ULONG ulBytesIndicated,
|
|
ULONG ulBytesAvailable,
|
|
PVOID pvTsdu,
|
|
BOOLEAN fIsChained)
|
|
{
|
|
DebugPrint3("pAddressObject = %p\n"
|
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"pEndpoint = %p\n"
|
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"ulReceiveFlags = 0x%08x\n",
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pAddressObject,
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ConnectionContext,
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ulReceiveFlags);
|
|
|
|
if (ulReceiveFlags & TDI_RECEIVE_NORMAL)
|
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{
|
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DebugPrint0(" TDI_RECEIVE_NORMAL\n");
|
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}
|
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|
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if (ulReceiveFlags & TDI_RECEIVE_EXPEDITED)
|
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{
|
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DebugPrint0(" TDI_RECEIVE_EXPEDITED\n");
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}
|
|
|
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if (ulReceiveFlags & TDI_RECEIVE_ENTIRE_MESSAGE)
|
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{
|
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DebugPrint0(" TDI_RECEIVE_ENTIRE_MESSAGE\n");
|
|
}
|
|
|
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if (ulReceiveFlags & TDI_RECEIVE_AT_DISPATCH_LEVEL)
|
|
{
|
|
DebugPrint0(" TDI_RECEIVE_AT_DISPATCH_LEVEL\n");
|
|
}
|
|
|
|
if (fIsChained)
|
|
{
|
|
DebugPrint3("ReceiveLength = %u\n"
|
|
"StartingOffset = 0x%08x\n"
|
|
"pMdl = %p\n",
|
|
ulBytesIndicated,
|
|
ulBytesAvailable,
|
|
pvTsdu);
|
|
}
|
|
else
|
|
{
|
|
DebugPrint3("BytesIndicated = %u\n"
|
|
"TotalBytes = %u\n"
|
|
"pDataBuffer = %p\n",
|
|
ulBytesIndicated,
|
|
ulBytesAvailable,
|
|
pvTsdu);
|
|
}
|
|
}
|
|
|
|
|
|
// ------------------------------------------------------
|
|
//
|
|
// Function: TSGetRestOfData
|
|
//
|
|
// Arguments: pAddressObject -- address object we are receiving on
|
|
// pReceiveData -- what we have received so far..
|
|
//
|
|
// Returns: Irp to return to transport, to get rest of data (NULL if error)
|
|
//
|
|
// Descript: This function sets up the IRP to get the rest of a datagram
|
|
// that was only partially delivered via the event handler
|
|
//
|
|
// -------------------------------------------------
|
|
|
|
PIRP
|
|
TSGetRestOfData(PADDRESS_OBJECT pAddressObject,
|
|
PRECEIVE_DATA pReceiveData,
|
|
BOOLEAN fIsExpedited)
|
|
|
|
{
|
|
PUCHAR pucDataBuffer = pReceiveData->pucDataBuffer + pReceiveData->ulBufferUsed;
|
|
ULONG ulBufferLength = pReceiveData->ulBufferLength - pReceiveData->ulBufferUsed;
|
|
PRECEIVE_CONTEXT pReceiveContext = NULL;
|
|
PMDL pReceiveMdl = NULL;
|
|
|
|
|
|
//
|
|
// allocate all the necessary structures
|
|
// our context
|
|
//
|
|
if ((TSAllocateMemory((PVOID *)&pReceiveContext,
|
|
sizeof(RECEIVE_CONTEXT),
|
|
strFuncP3,
|
|
"ReceiveContext")) != STATUS_SUCCESS)
|
|
{
|
|
goto cleanup;
|
|
}
|
|
|
|
|
|
//
|
|
// then the actual mdl
|
|
//
|
|
pReceiveMdl = TSAllocateBuffer(pucDataBuffer,
|
|
ulBufferLength);
|
|
|
|
if (pReceiveMdl)
|
|
{
|
|
//
|
|
// set up the completion context
|
|
//
|
|
pReceiveContext->pLowerMdl = pReceiveMdl;
|
|
pReceiveContext->pReceiveData = pReceiveData;
|
|
pReceiveContext->pAddressObject = pAddressObject;
|
|
pReceiveContext->fIsExpedited = fIsExpedited;
|
|
|
|
//
|
|
// finally, the irp itself
|
|
//
|
|
PIRP pLowerIrp = TSAllocateIrp(pAddressObject->pEndpoint->GenHead.pDeviceObject,
|
|
pAddressObject->pIrpPool);
|
|
|
|
if (pLowerIrp)
|
|
{
|
|
//
|
|
// if made it to here, everything is correctly allocated
|
|
// set up the irp for the call
|
|
//
|
|
#pragma warning(disable: CONSTANT_CONDITIONAL)
|
|
|
|
TdiBuildReceive(pLowerIrp,
|
|
pAddressObject->pEndpoint->GenHead.pDeviceObject,
|
|
pAddressObject->pEndpoint->GenHead.pFileObject,
|
|
TSReceiveComplete,
|
|
pReceiveContext,
|
|
pReceiveMdl,
|
|
TDI_RECEIVE_NORMAL,
|
|
ulBufferLength);
|
|
|
|
#pragma warning(default: CONSTANT_CONDITIONAL)
|
|
|
|
return pLowerIrp;
|
|
}
|
|
}
|
|
|
|
//
|
|
// get here if there was an allocation failure
|
|
// need to clean up everything else...
|
|
//
|
|
cleanup:
|
|
if (pReceiveContext)
|
|
{
|
|
TSFreeMemory(pReceiveContext);
|
|
}
|
|
if (pReceiveMdl)
|
|
{
|
|
TSFreeBuffer(pReceiveMdl);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
|
|
// ---------------------------------------------
|
|
//
|
|
// Function: TSCommonReceive
|
|
//
|
|
// Arguments: see TSReceiveHandler
|
|
//
|
|
// Returns: status to return to protocol
|
|
//
|
|
// Descript: Common code for TSReceiveHandler and
|
|
// TSRcvExpeditedHandler. Pretty much all the work is
|
|
// done here
|
|
//
|
|
// ---------------------------------------------
|
|
|
|
|
|
TDI_STATUS
|
|
TSCommonReceive(PADDRESS_OBJECT pAddressObject,
|
|
ULONG ulBytesTotal,
|
|
ULONG ulBytesIndicated,
|
|
ULONG ulReceiveFlags,
|
|
PVOID pvTsdu,
|
|
BOOLEAN fIsExpedited,
|
|
PULONG pulBytesTaken,
|
|
PIRP *pIoRequestPacket)
|
|
{
|
|
//
|
|
// check for a bad condition -- more bytes indicated that total
|
|
//
|
|
if (ulBytesIndicated > ulBytesTotal)
|
|
{
|
|
DebugPrint2("%u bytes indicated > %u bytes total\n",
|
|
ulBytesIndicated,
|
|
ulBytesTotal);
|
|
return TDI_NOT_ACCEPTED;
|
|
}
|
|
|
|
|
|
PRECEIVE_DATA pReceiveData;
|
|
|
|
if ( (TSAllocateMemory((PVOID *)&pReceiveData,
|
|
sizeof(RECEIVE_DATA),
|
|
strFuncP4,
|
|
"ReceiveData")) == STATUS_SUCCESS)
|
|
{
|
|
PUCHAR pucDataBuffer = NULL;
|
|
|
|
if ((TSAllocateMemory((PVOID *)&pucDataBuffer,
|
|
ulBytesTotal,
|
|
strFuncP4,
|
|
"DataBuffer")) == STATUS_SUCCESS)
|
|
{
|
|
pReceiveData->pucDataBuffer = pucDataBuffer;
|
|
pReceiveData->ulBufferLength = ulBytesTotal;
|
|
}
|
|
else
|
|
{
|
|
TSFreeMemory(pReceiveData);
|
|
return TDI_NOT_ACCEPTED;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return TDI_NOT_ACCEPTED;
|
|
}
|
|
|
|
//
|
|
// copy the data indicated to us into the buffer
|
|
//
|
|
TdiCopyLookaheadData(pReceiveData->pucDataBuffer,
|
|
pvTsdu,
|
|
ulBytesIndicated,
|
|
ulReceiveFlags);
|
|
|
|
pReceiveData->ulBufferUsed = ulBytesIndicated;
|
|
|
|
//
|
|
// first case -- entire packet indicated to us
|
|
//
|
|
if (ulBytesIndicated == ulBytesTotal)
|
|
{
|
|
TSPacketReceived(pAddressObject,
|
|
pReceiveData,
|
|
fIsExpedited);
|
|
|
|
*pulBytesTaken = ulBytesTotal;
|
|
*pIoRequestPacket = NULL;
|
|
return TDI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// second case -- only part of data indicated up
|
|
//
|
|
else
|
|
{
|
|
PIRP pLowerIrp = TSGetRestOfData(pAddressObject,
|
|
pReceiveData,
|
|
fIsExpedited);
|
|
|
|
if (pLowerIrp)
|
|
{
|
|
//
|
|
// need to do this since we are bypassing IoCallDriver
|
|
//
|
|
IoSetNextIrpStackLocation(pLowerIrp);
|
|
|
|
*pulBytesTaken = ulBytesIndicated;
|
|
*pIoRequestPacket = pLowerIrp;
|
|
return TDI_MORE_PROCESSING;
|
|
}
|
|
else
|
|
{
|
|
DebugPrint1("%s: unable to get rest of packet\n", strFuncP4);
|
|
TSFreeMemory(pReceiveData->pucDataBuffer);
|
|
TSFreeMemory(pReceiveData);
|
|
return TDI_NOT_ACCEPTED;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// ---------------------------------------------
|
|
//
|
|
// Function: TSCommonChainedReceive
|
|
//
|
|
// Arguments: see TStChainedRcvhandler
|
|
//
|
|
// Returns: status
|
|
//
|
|
// Descript: Common code for TSChainedReceiveHandler and
|
|
// TSChainedRcvExpeditedHandler. Pretty much all the work is
|
|
// done here
|
|
//
|
|
// ---------------------------------------------
|
|
|
|
TDI_STATUS
|
|
TSCommonChainedReceive(PADDRESS_OBJECT pAddressObject,
|
|
ULONG ulReceiveLength,
|
|
ULONG ulStartingOffset,
|
|
PMDL pReceiveMdl,
|
|
BOOLEAN fIsExpedited,
|
|
PVOID pvTsduDescriptor)
|
|
{
|
|
PRECEIVE_DATA pReceiveData;
|
|
|
|
|
|
if ((TSAllocateMemory((PVOID *)&pReceiveData,
|
|
sizeof(RECEIVE_DATA),
|
|
strFuncP5,
|
|
"ReceiveData")) == STATUS_SUCCESS)
|
|
{
|
|
PUCHAR pucDataBuffer;
|
|
|
|
if((TSAllocateMemory((PVOID *)&pucDataBuffer,
|
|
ulReceiveLength,
|
|
strFuncP5,
|
|
"DataBuffer")) == STATUS_SUCCESS)
|
|
{
|
|
ULONG ulBytesCopied;
|
|
|
|
TdiCopyMdlToBuffer(pReceiveMdl,
|
|
ulStartingOffset,
|
|
pucDataBuffer,
|
|
0,
|
|
ulReceiveLength,
|
|
&ulBytesCopied);
|
|
|
|
//
|
|
// if successfully copied all data
|
|
//
|
|
if (ulBytesCopied == ulReceiveLength)
|
|
{
|
|
pReceiveData->pucDataBuffer = pucDataBuffer;
|
|
pReceiveData->ulBufferLength = ulReceiveLength;
|
|
pReceiveData->ulBufferUsed = ulReceiveLength;
|
|
TSPacketReceived(pAddressObject,
|
|
pReceiveData,
|
|
fIsExpedited);
|
|
|
|
return TDI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// error in copying data!
|
|
//
|
|
else
|
|
{
|
|
DebugPrint1("%s: error copying data\n", strFuncP5);
|
|
TSFreeMemory(pucDataBuffer);
|
|
TSFreeMemory(pReceiveData);
|
|
}
|
|
}
|
|
else // unable to allocate pucDataBuffer
|
|
{
|
|
TSFreeMemory(pReceiveData);
|
|
}
|
|
}
|
|
return TDI_NOT_ACCEPTED;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// end of file receive.cpp
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
|