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////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2014 Microsoft Corporation. All Rights Reserved.
//
// Module Name:
// HelperFunctions_RedirectData.cpp
//
// Abstract:
// This module contains kernel helper functions that assist with REDIRECT_DATA.
//
// Naming Convention:
//
// <Module><Object><Action>
//
// i.e.
//
// KrnlHlprWorkItemQueue
//
// <Module>
// KrnlHlpr - Function is located in syslib\ and applies to kernel mode.
// <Object>
// RedirectData - Function pertains to REDIRECT_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:
// KrnlHlprRedirectDataDataCreate(),
// KrnlHlprRedirectDataDataDestroy(),
// KrnlHlprRedirectDataDataPopulate(),
// KrnlHlprRedirectDataDataPurge(),
//
// Author:
// Dusty Harper (DHarper)
//
// Revision History:
//
// [ Month ][Day] [Year] - [Revision]-[ Comments ]
// May 01, 2010 - 1.0 - Creation
// December 13, 2013 - 1.1 - Enhance support for ALE redirection.
//
////////////////////////////////////////////////////////////////////////////////////////////////////
#include "HelperFunctions_Include.h" /// .
#include "HelperFunctions_RedirectData.tmh" /// $(OBJ_PATH)\$(O)\
#if(NTDDI_VERSION >= NTDDI_WIN7)
/**
@kernel_helper_function="KrnlHlprRedirectDataPurge"
Purpose: Cleanup a REDIRECT_DATA object. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/FF551137.aspx <br>
HTTP://MSDN.Microsoft.com/En-US/Library/FF551150.aspx <br>
HTTP://MSDN.Microsoft.com/En-US/Library/FF551208.aspx <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
inline VOID KrnlHlprRedirectDataPurge(_Inout_ REDIRECT_DATA* pRedirectData)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprRedirectDataPurge()\n");
#endif /// DBG
NT_ASSERT(pRedirectData);
if(pRedirectData->pWritableLayerData)
{
FwpsApplyModifiedLayerData(pRedirectData->classifyHandle,
pRedirectData->pWritableLayerData,
FWPS_CLASSIFY_FLAG_REAUTHORIZE_IF_MODIFIED_BY_OTHERS);
pRedirectData->pWritableLayerData = 0;
}
if(pRedirectData->classifyHandle)
{
if(pRedirectData->isPended)
{
FwpsCompleteClassify(pRedirectData->classifyHandle,
0,
pRedirectData->pClassifyOut);
pRedirectData->isPended = FALSE;
}
FwpsReleaseClassifyHandle(pRedirectData->classifyHandle);
pRedirectData->classifyHandle = 0;
}
RtlZeroMemory(pRedirectData,
sizeof(REDIRECT_DATA));
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprRedirectDataPurge()\n");
#endif /// DBG
return;
}
/**
@kernel_helper_function="KrnlHlprRedirectDataDestroy"
Purpose: Cleanup and free a REDIRECT_DATA object. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_At_(*ppRedirectData, _Pre_ _Notnull_)
_At_(*ppRedirectData, _Post_ _Null_ __drv_freesMem(Pool))
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(*ppRedirectData == 0)
VOID KrnlHlprRedirectDataDestroy(_Inout_ REDIRECT_DATA** ppRedirectData)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprRedirectDataDestroy()\n");
#endif /// DBG
NT_ASSERT(ppRedirectData);
if(*ppRedirectData)
{
KrnlHlprRedirectDataPurge(*ppRedirectData);
HLPR_DELETE(*ppRedirectData,
WFPSAMPLER_SYSLIB_TAG);
}
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprRedirectDataDestroy()\n");
#endif /// DBG
return;
}
/**
@kernel_helper_function="KrnlHlprRedirectDataPopulate"
Purpose: Populates a REDIRECT_DATA object with the classifyHandle and the writable layer
data pointer. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: HTTP://MSDN.Microsoft.com/En-US/Library/FF550085.aspx <br>
HTTP://MSDN.Microsoft.com/En-US/Library/FF550087.aspx <br>
*/
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Check_return_
_Success_(return == STATUS_SUCCESS)
NTSTATUS KrnlHlprRedirectDataPopulate(_Inout_ REDIRECT_DATA* pRedirectData,
_In_ const VOID* pClassifyContext,
_In_ const FWPS_FILTER* pFilter,
_In_ FWPS_CLASSIFY_OUT* pClassifyOut,
_In_opt_ HANDLE redirectHandle)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprRedirectDataPopulate()\n");
#endif /// DBG
NT_ASSERT(pRedirectData);
NT_ASSERT(pClassifyContext);
NT_ASSERT(pFilter);
NT_ASSERT(pClassifyOut);
NT_ASSERT(pFilter->providerContext);
NT_ASSERT(pFilter->providerContext->type == FWPM_GENERAL_CONTEXT);
NT_ASSERT(pFilter->providerContext->dataBuffer);
NT_ASSERT(pFilter->providerContext->dataBuffer->size == sizeof(PC_PROXY_DATA));
NT_ASSERT(pFilter->providerContext->dataBuffer->data);
NTSTATUS status = STATUS_SUCCESS;
status = FwpsAcquireClassifyHandle((void*)pClassifyContext,
0,
&(pRedirectData->classifyHandle));
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprRedirectDataPopulate : FwpsAcquireClassifyHandle() [status: %#x]\n",
status);
HLPR_BAIL;
}
status = FwpsAcquireWritableLayerDataPointer(pRedirectData->classifyHandle,
pFilter->filterId,
0,
&(pRedirectData->pWritableLayerData),
pClassifyOut);
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprRedirectDataPopulate : FwpsAcquireWritableLayerDataPointer() [status: %#x]\n",
status);
HLPR_BAIL;
}
#if(NTDDI_VERSION >= NTDDI_WIN8)
pRedirectData->redirectHandle = redirectHandle;
#else
UNREFERENCED_PARAMETER(redirectHandle);
#endif /// (NTDDI_VERSION >= NTDDI_WIN8)
pRedirectData->pProxyData = (PC_PROXY_DATA*)pFilter->providerContext->dataBuffer->data;
HLPR_BAIL_LABEL:
if(status != STATUS_SUCCESS)
KrnlHlprRedirectDataPurge(pRedirectData);
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprRedirectDataPopulate() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
/**
@kernel_helper_function="KrnlHlprRedirectDataCreate"
Purpose: Allocates and populates a REDIRECT_DATA object with the classifyHandle and the
writable layer data pointer. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_At_(*ppRedirectData, _Pre_ _Null_)
_When_(return != STATUS_SUCCESS, _At_(*ppRedirectData, _Post_ _Null_))
_When_(return == STATUS_SUCCESS, _At_(*ppRedirectData, _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 KrnlHlprRedirectDataCreate(_Outptr_ REDIRECT_DATA** ppRedirectData,
_In_ const VOID* pClassifyContext,
_In_ const FWPS_FILTER* pFilter,
_In_ FWPS_CLASSIFY_OUT* pClassifyOut,
_In_opt_ HANDLE redirectHandle)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprRedirectDataCreate()\n");
#endif /// DBG
NT_ASSERT(ppRedirectData);
NT_ASSERT(pClassifyContext);
NT_ASSERT(pFilter);
NT_ASSERT(pClassifyOut);
NTSTATUS status = STATUS_SUCCESS;
HLPR_NEW(*ppRedirectData,
REDIRECT_DATA,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(*ppRedirectData,
status);
status = KrnlHlprRedirectDataPopulate(*ppRedirectData,
pClassifyContext,
pFilter,
pClassifyOut,
redirectHandle);
HLPR_BAIL_LABEL:
#pragma warning(push)
#pragma warning(disable: 6001) /// *ppRedirectData initialized with call to HLPR_NEW & KrnlHlprRedirectDataPopulate
if(status != STATUS_SUCCESS &&
*ppRedirectData)
KrnlHlprRedirectDataDestroy(ppRedirectData);
#pragma warning(pop)
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprRedirectDataCreate() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
#endif // (NTDDI_VERSION >= NTDDI_WIN7)
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