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////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2014 Microsoft Corporation. All Rights Reserved.
//
// Module Name:
// HelperFunctions_FlowContext.cpp
//
// Abstract:
// This module contains kernel helper functions that assist with FLOW_CONTEXT.
//
// Naming Convention:
//
// <Module><Object><Action><Modifier>
//
// i.e.
//
// KrnlHlprFlowContextCreate
//
// <Module>
// KrnlHlpr - Function is located in syslib\ and applies to kernel mode.
// <Object>
// FlowContext - Function pertains to FLOW_CONTEXT objects.
// <Action>
// {
// Create - Function allocates and fills memory.
// Destroy - Function cleans up and frees memory.
// }
// <Modifer>
//
// Private Functions:
//
// Public Functions:
//
// Author:
// Dusty Harper (DHarper)
//
// Revision History:
//
// [ Month ][Day] [Year] - [Revision]-[ Comments ]
// December 13, 2013 - 1.1 - Creation
//
////////////////////////////////////////////////////////////////////////////////////////////////////
#include "HelperFunctions_Include.h" /// .
#include "HelperFunctions_FlowContext.tmh" /// $(OBJ_PATH)\$(O)\
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(return == STATUS_SUCCESS)
inline NTSTATUS KrnlHlprFlowContextPurge(_Inout_ FLOW_CONTEXT* pFlowContext)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprFlowContextPurge()\n");
#endif /// DBG
NT_ASSERT(pFlowContext);
NTSTATUS status = STATUS_SUCCESS;
status = FwpsFlowRemoveContext(pFlowContext->flowID,
pFlowContext->layerID,
pFlowContext->calloutID);
if(status != STATUS_SUCCESS)
{
if(status != STATUS_UNSUCCESSFUL)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprFlowContextPurge : FwpsFlowRemoveContext() [status: %#x]\n",
status);
HLPR_BAIL;
}
/// no context currently associated with the flow, so it should be safe to delete
}
HLPR_DELETE(pFlowContext->pContext,
WFPSAMPLER_SYSLIB_TAG);
RtlZeroMemory(pFlowContext,
sizeof(FLOW_CONTEXT));
HLPR_BAIL_LABEL:
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprFlowContextPurge()\n");
#endif /// DBG
return status;
}
_At_(*ppFlowContext, _Pre_ _Notnull_)
_At_(*ppFlowContext, _Post_ _Null_ __drv_freesMem(Pool))
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Success_(return == STATUS_SUCCESS && *ppFlowContext == 0)
NTSTATUS KrnlHlprFlowContextDestroy(_Inout_ FLOW_CONTEXT** ppFlowContext)
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprFlowContextDestroy()\n");
#endif /// DBG
NT_ASSERT(ppFlowContext);
NTSTATUS status = STATUS_SUCCESS;
if(*ppFlowContext)
{
status = KrnlHlprFlowContextPurge(*ppFlowContext);
HLPR_BAIL_ON_FAILURE(status);
HLPR_DELETE(*ppFlowContext,
WFPSAMPLER_SYSLIB_TAG);
}
HLPR_BAIL_LABEL:
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprFlowContextDestroy()\n");
#endif /// DBG
return status;
}
_IRQL_requires_min_(PASSIVE_LEVEL)
_IRQL_requires_max_(DISPATCH_LEVEL)
_IRQL_requires_same_
_Check_return_
_Success_(return == STATUS_SUCCESS)
NTSTATUS KrnlHlprFlowContextPopulate(_Inout_ FLOW_CONTEXT* pFlowContext,
_In_ UINT64 flowHandle,
_In_ UINT16 layerID,
_In_ UINT32 calloutID,
_In_ UINT8 contextType, /* CONTEXT_TYPE_DEFAULT */
_In_opt_ const VOID* pProviderContext) /* 0 */
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprFlowContextPopulate()\n");
#endif /// DBG
NT_ASSERT(pFlowContext);
NTSTATUS status = STATUS_SUCCESS;
pFlowContext->flowID = flowHandle;
pFlowContext->layerID = layerID;
pFlowContext->calloutID = calloutID;
pFlowContext->contextType = contextType;
if(pFlowContext->contextType == CONTEXT_TYPE_DEFAULT ||
pFlowContext->contextType >= CONTEXT_TYPE_MAX)
{
if(layerID == FWPS_LAYER_STREAM_V4 ||
layerID == FWPS_LAYER_STREAM_V6)
pFlowContext->contextType = CONTEXT_TYPE_STREAM;
#if(NTDDI_VERSION >= NTDDI_WIN7)
else if(layerID == FWPS_LAYER_ALE_ENDPOINT_CLOSURE_V4 ||
layerID == FWPS_LAYER_ALE_ENDPOINT_CLOSURE_V6)
pFlowContext->contextType = CONTEXT_TYPE_ALE_ENDPOINT_CLOSURE;
#endif /// (NTDDI_VERSION >= NTDDI_WIN7)
else
{
status = STATUS_INVALID_PARAMETER;
HLPR_BAIL;
}
}
switch(pFlowContext->contextType)
{
case CONTEXT_TYPE_STREAM:
{
HLPR_NEW(pFlowContext->pStreamContext,
STREAM_CONTEXT,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(pFlowContext->pStreamContext,
status);
KeInitializeSpinLock(&(pFlowContext->pStreamContext->serializationList.spinLock));
status = WdfWaitLockCreate(WDF_NO_OBJECT_ATTRIBUTES,
&(pFlowContext->pStreamContext->serializationList.waitLock));
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprFlowContextCreate : WdfWaitLockCreate() [status: %#x]\n",
status);
HLPR_BAIL;
}
InitializeListHead(&(pFlowContext->pStreamContext->serializationList.listHead));
pFlowContext->pStreamContext->processorID = KeGetCurrentProcessorNumber();
#if(NTDDI_VERSION >= NTDDI_WIN7)
if(pProviderContext)
{
PC_FLOW_ASSOCIATION_DATA* pFlowAssociationData = (PC_FLOW_ASSOCIATION_DATA*)pProviderContext;
for(UINT32 aecIndex = 0;
aecIndex < pFlowAssociationData->itemCount;
aecIndex++)
{
if(pFlowAssociationData->pLayerIDs[aecIndex] == FWPS_LAYER_ALE_ENDPOINT_CLOSURE_V4 ||
pFlowAssociationData->pLayerIDs[aecIndex] == FWPS_LAYER_ALE_ENDPOINT_CLOSURE_V6)
{
pFlowContext->aecLayerID = pFlowAssociationData->pLayerIDs[aecIndex];
pFlowContext->aecCalloutID = pFlowAssociationData->pCalloutIDs[aecIndex];
break;
}
}
}
#else
UNREFERENCED_PARAMETER(pProviderContext);
#endif /// (NTDDI_VERSION >= NTDDI_WIN7)
break;
}
#if(NTDDI_VERSION >= NTDDI_WIN7)
case CONTEXT_TYPE_ALE_ENDPOINT_CLOSURE:
{
HLPR_NEW(pFlowContext->pALEEndpointClosureContext,
ALE_ENDPOINT_CLOSURE_CONTEXT,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(pFlowContext->pALEEndpointClosureContext,
status);
KeInitializeSpinLock(&(pFlowContext->pALEEndpointClosureContext->spinLock));
if(pProviderContext)
{
PC_FLOW_ASSOCIATION_DATA* pFlowAssociationData = (PC_FLOW_ASSOCIATION_DATA*)pProviderContext;
for(UINT32 injectionIndex = 0;
injectionIndex < pFlowAssociationData->itemCount;
injectionIndex++)
{
if(pFlowAssociationData->pLayerIDs[injectionIndex] == FWPS_LAYER_STREAM_V4 ||
pFlowAssociationData->pLayerIDs[injectionIndex] == FWPS_LAYER_STREAM_V6)
{
pFlowContext->injectionLayerID = pFlowAssociationData->pLayerIDs[injectionIndex];
pFlowContext->injectionCalloutID = pFlowAssociationData->pCalloutIDs[injectionIndex];
break;
}
}
}
break;
}
#endif /// (NTDDI_VERSION >= NTDDI_WIN7)
}
status = FwpsFlowAssociateContext(pFlowContext->flowID,
pFlowContext->layerID,
pFlowContext->calloutID,
(UINT64)pFlowContext);
if(status != STATUS_SUCCESS)
{
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_ERROR_LEVEL,
" !!!! KrnlHlprFlowContextCreate : FwpsFlowAssociateContext() [status: %#x]\n",
status);
HLPR_BAIL;
}
HLPR_BAIL_LABEL:
if(status != STATUS_SUCCESS)
KrnlHlprFlowContextPurge(pFlowContext);
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprFlowContextPopulate() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
_At_(*ppFlowContext, _Pre_ _Null_)
_When_(return != STATUS_SUCCESS, _At_(*ppFlowContext, _Post_ _Null_))
_When_(return == STATUS_SUCCESS, _At_(*ppFlowContext, _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 KrnlHlprFlowContextCreate(_Outptr_ FLOW_CONTEXT** ppFlowContext,
_In_ UINT64 flowHandle,
_In_ UINT16 layerID,
_In_ UINT32 calloutID,
_In_ UINT8 contextType, /* CONTEXT_TYPE_DEFAULT */
_In_opt_ const VOID* pProviderContext) /* 0 */
{
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" ---> KrnlHlprFlowContextCreate()\n");
#endif /// DBG
NT_ASSERT(ppFlowContext);
NTSTATUS status = STATUS_SUCCESS;
HLPR_NEW(*ppFlowContext,
FLOW_CONTEXT,
WFPSAMPLER_SYSLIB_TAG);
HLPR_BAIL_ON_ALLOC_FAILURE(*ppFlowContext,
status);
status = KrnlHlprFlowContextPopulate(*ppFlowContext,
flowHandle,
layerID,
calloutID,
contextType,
pProviderContext);
HLPR_BAIL_LABEL:
#pragma warning(push)
#pragma warning(disable: 6001) /// *ppFlowContext initialized with call to HLPR_NEW & KrnlHlprFlowContextPopulate
if(status != STATUS_SUCCESS &&
*ppFlowContext)
KrnlHlprFlowContextDestroy(ppFlowContext);
#pragma warning(pop)
#if DBG
DbgPrintEx(DPFLTR_IHVNETWORK_ID,
DPFLTR_INFO_LEVEL,
" <--- KrnlHlprFlowContextCreate() [status: %#x]\n",
status);
#endif /// DBG
return status;
}
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