Sample Code
Windows Driver Samples/ Windows Filtering Platform Sample/ C++/ syslib/ HelperFunctions_PendData.cpp/
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All Rights Reserved.//// Module Name:// HelperFunctions_PendData.cpp//// Abstract:// This module contains kernel helper functions that assist with PEND_DATA.//// Naming Convention://// <Module><Object><Action>// // i.e.//// KrnlHlprWorkItemQueue//// <Module>// KrnlHlpr - Function is located in syslib\ and applies to kernel mode.// <Object>// PendData - Function pertains to PEND_DATA objects.// <Action>// {// Create - Function allocates and fills memory.// Destroy - Function cleans up and frees memory.// Populate - Function fills memory with values// Purge - Function cleans up values// }//// Private Functions://// Public Functions:// KrnlHlprPendDataDataCreate(),// KrnlHlprPendDataDataDestroy(),// KrnlHlprPendDataDataPopulate(),// KrnlHlprPendDataDataPurge(),//// Author:// Dusty Harper (DHarper)//// Revision History://// [ Month ][Day] [Year] - [Revision]-[ Comments ]// May 01, 2010 - 1.0 - Creation//////////////////////////////////////////////////////////////////////////////////////////////////////#include "HelperFunctions_Include.h" /// .#include "HelperFunctions_PendData.tmh" /// $(OBJ_PATH)\$(O)\/** @kernel_helper_function="KrnlHlprPendDataPurge" Purpose: Cleanup a PEND_DATA object. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/FF551199.aspx <br>*/_IRQL_requires_min_(PASSIVE_LEVEL)_IRQL_requires_max_(DISPATCH_LEVEL)_IRQL_requires_same_inline VOID KrnlHlprPendDataPurge(_Inout_ PEND_DATA* pPendData){#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " ---> KrnlHlprPendDataPurge()\n");#endif /// DBG NT_ASSERT(pPendData); if(pPendData->completionContext && pPendData->isPended) { FwpsCompleteOperation(pPendData->completionContext, pPendData->pNBL); pPendData->completionContext = 0; pPendData->pNBL = 0; pPendData->pPendAuthorizationData = 0; pPendData->isPended = FALSE; } RtlZeroMemory(pPendData, sizeof(PEND_DATA));#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " <--- KrnlHlprPendDataPurge()\n");#endif /// DBG return;}/** @kernel_helper_function="KrnlHlprPendDataDestroy" Purpose: Cleanup and free a PEND_DATA object. <br> <br> Notes: <br> <br> MSDN_Ref: <br>*/_At_(ppPendData, _Pre_ _Notnull_)_At_(*ppPendData, _Post_ _Null_ __drv_freesMem(Pool))_IRQL_requires_min_(PASSIVE_LEVEL)_IRQL_requires_max_(DISPATCH_LEVEL)_IRQL_requires_same__Success_(*ppPendData == 0)inline VOID KrnlHlprPendDataDestroy(_Inout_ PEND_DATA** ppPendData){#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " ---> KrnlHlprPendDataDestroy()\n");#endif /// DBG NT_ASSERT(ppPendData); if(*ppPendData) { KrnlHlprPendDataPurge(*ppPendData); HLPR_DELETE(*ppPendData, WFPSAMPLER_SYSLIB_TAG); }#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " <--- KrnlHlprPendDataDestroy()\n");#endif /// DBG return;}/** @kernel_helper_function="KrnlHlprPendDataPopulate" Purpose: Populates a PEND_DATA object with the completionContext. <br> <br> Notes: <br> <br> MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/ff551199.aspx <br>*/_IRQL_requires_min_(PASSIVE_LEVEL)_IRQL_requires_max_(DISPATCH_LEVEL)_IRQL_requires_same__Check_return__Success_(return == STATUS_SUCCESS)NTSTATUS KrnlHlprPendDataPopulate(_Inout_ PEND_DATA* pPendData, _In_ const FWPS_INCOMING_METADATA_VALUES* pMetadata, _In_opt_ NET_BUFFER_LIST* pNBL, _In_ const FWPS_FILTER* pFilter){#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " ---> KrnlHlprPendDataPopulate()\n");#endif /// DBG NT_ASSERT(pPendData); NT_ASSERT(pMetadata); NT_ASSERT(pFilter); NTSTATUS status = STATUS_SUCCESS; if(FWPS_IS_METADATA_FIELD_PRESENT(pMetadata, FWPS_METADATA_FIELD_COMPLETION_HANDLE)) { status = FwpsPendOperation(pMetadata->completionHandle, &(pPendData->completionContext)); if(status != STATUS_SUCCESS) { DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_ERROR_LEVEL, " !!!! KrnlHlprPendDataPopulate : FwpsPendOperation() [status: %#x]\n", status); HLPR_BAIL; } pPendData->pNBL = pNBL; pPendData->pPendAuthorizationData = (PC_PEND_AUTHORIZATION_DATA*)pFilter->providerContext->dataBuffer->data; pPendData->isPended = TRUE; HLPR_BAIL_LABEL: if(status != STATUS_SUCCESS) KrnlHlprPendDataPurge(pPendData); } else { status = STATUS_INVALID_HANDLE; DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_ERROR_LEVEL, " !!!! KrnlHlprPendDataPopulate() [status: %#x]\n", status); }#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " <--- KrnlHlprPendDataPopulate() [status: %#x]\n", status);#endif /// DBG return status;}/** @kernel_helper_function="KrnlHlprPendDataCreate" Purpose: Allocates and populates a PEND_DATA object with the completionContext. <br> <br> Notes: <br> <br> MSDN_Ref: <br>*/_At_(*ppPendData, _Pre_ _Null_)_When_(return != STATUS_SUCCESS, _At_(*ppPendData, _Post_ _Null_))_When_(return == STATUS_SUCCESS, _At_(*ppPendData, _Post_ _Notnull_ __drv_allocatesMem(Pool)))_IRQL_requires_min_(PASSIVE_LEVEL)_IRQL_requires_max_(DISPATCH_LEVEL)_IRQL_requires_same__Check_return__Success_(return == STATUS_SUCCESS)NTSTATUS KrnlHlprPendDataCreate(_Outptr_ PEND_DATA** ppPendData, _In_ const FWPS_INCOMING_METADATA_VALUES* pMetadata, _In_opt_ NET_BUFFER_LIST* pNBL, _In_ const FWPS_FILTER* pFilter){#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " ---> KrnlHlprPendDataCreate()\n");#endif /// DBG NT_ASSERT(ppPendData); NT_ASSERT(pMetadata); NT_ASSERT(pFilter); NTSTATUS status = STATUS_SUCCESS; HLPR_NEW(*ppPendData, PEND_DATA, WFPSAMPLER_SYSLIB_TAG); HLPR_BAIL_ON_ALLOC_FAILURE(*ppPendData, status); status = KrnlHlprPendDataPopulate(*ppPendData, pMetadata, pNBL, pFilter); HLPR_BAIL_LABEL:#pragma warning(push)#pragma warning(disable: 6001) /// *ppPendData initialized with calls to HLPR_NEW & KrnlHlprPendDataPopulate if(status != STATUS_SUCCESS && *ppPendData) KrnlHlprPendDataDestroy(ppPendData);#pragma warning(pop)#if DBG DbgPrintEx(DPFLTR_IHVNETWORK_ID, DPFLTR_INFO_LEVEL, " <--- KrnlHlprPendDataCreate() [status: %#x]\n", status);#endif /// DBG return status;} |
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