Sample Code

Windows Driver Samples/ Hyper-V Extensible Switch extension filter driver/ C++/ base/ SxLibrary.c/ 

/*++

Copyright (c) Microsoft Corporation. All Rights Reserved.

Module Name:

    SxLibrary.c

Abstract:

    This file contains the common library functions that can be used
    by any extension using the SxBase library.


--*/

#include "precomp.h"

VOID
SxLibSendNetBufferListsIngress(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ PNET_BUFFER_LIST NetBufferLists,
    _In_ ULONG SendFlags,
    _In_ ULONG NumInjectedNetBufferLists
    )
{
    BOOLEAN dispatch;
    BOOLEAN sameSource;
    ULONG sendCompleteFlags;
    PNDIS_SWITCH_FORWARDING_DETAIL_NET_BUFFER_LIST_INFO fwdDetail;
    PNET_BUFFER_LIST curNbl, nextNbl;
    ULONG numNbls = 0;
    PNET_BUFFER_LIST dropNbl = NULL;
    PNET_BUFFER_LIST *curDropNbl = &dropNbl;
    NDIS_SWITCH_PORT_ID curSourcePort;
    NDIS_STRING filterReason;
    
    dispatch = NDIS_TEST_SEND_AT_DISPATCH_LEVEL(SendFlags);
    sameSource = NDIS_TEST_SEND_FLAG(SendFlags, NDIS_SEND_FLAGS_SWITCH_SINGLE_SOURCE);
    
    InterlockedAdd(&Switch->PendingInjectedNblCount, NumInjectedNetBufferLists);
    KeMemoryBarrier();
    
    if (Switch->DataFlowState != SxSwitchRunning)
    {
        RtlInitUnicodeString(&filterReason, L"Extension Paused");
        
        sendCompleteFlags = (dispatch) ? NDIS_SEND_COMPLETE_FLAGS_DISPATCH_LEVEL : 0;
        sendCompleteFlags |= (sameSource) ? NDIS_SEND_COMPLETE_FLAGS_SWITCH_SINGLE_SOURCE : 0;
        
        fwdDetail = NET_BUFFER_LIST_SWITCH_FORWARDING_DETAIL(NetBufferLists);
    
        if (sameSource)
        {
            for (curNbl = NetBufferLists; curNbl != NULL; curNbl = curNbl->Next)
            {
                ++numNbls;
            }
            
            Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                         Switch->NdisSwitchContext,
                                         &SxExtensionGuid,
                                         &SxExtensionFriendlyName,
                                         fwdDetail->SourcePortId,
                                         NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                         numNbls,
                                         NetBufferLists,
                                         &filterReason);
                                         
            SxExtStartCompleteNetBufferListsIngress(Switch,
                                                    Switch->ExtensionContext,
                                                    NetBufferLists,
                                                    sendCompleteFlags);    
        }
        else
        {
            curSourcePort = fwdDetail->SourcePortId;
            for (curNbl = NetBufferLists; curNbl != NULL; curNbl = nextNbl)
            {
                nextNbl = curNbl->Next;
                curNbl->Next = NULL;
                
                fwdDetail = NET_BUFFER_LIST_SWITCH_FORWARDING_DETAIL(curNbl);
                
                if(curSourcePort == fwdDetail->SourcePortId)
                {
                    *curDropNbl = curNbl;
                    curDropNbl = &(curNbl->Next);
                    ++numNbls;
                }
                else
                {
                    Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                                 Switch->NdisSwitchContext,
                                                 &SxExtensionGuid,
                                                 &SxExtensionFriendlyName,
                                                 curSourcePort,
                                                 NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                                 numNbls,
                                                 dropNbl,
                                                 &filterReason);
                     
                    SxExtStartCompleteNetBufferListsIngress(Switch,
                                                            Switch->ExtensionContext,
                                                            dropNbl,
                                                            sendCompleteFlags);

                    numNbls = 1;
                    dropNbl = curNbl;
                    curDropNbl = &(curNbl->Next);
                    curSourcePort = fwdDetail->SourcePortId;
                }
            }
            
            Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                             Switch->NdisSwitchContext,
                                             &SxExtensionGuid,
                                             &SxExtensionFriendlyName,
                                             curSourcePort,
                                             NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                             numNbls,
                                             dropNbl,
                                             &filterReason);
                 
            SxExtStartCompleteNetBufferListsIngress(Switch,
                                                    Switch->ExtensionContext,
                                                    dropNbl,
                                                    sendCompleteFlags);
        }                                
                                            
        goto Cleanup;
    }
    
    NdisFSendNetBufferLists(Switch->NdisFilterHandle,
                            NetBufferLists,
                            NDIS_DEFAULT_PORT_NUMBER,
                            SendFlags);
                                
Cleanup:
    return;
}


VOID
SxLibSendNetBufferListsEgress(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ PNET_BUFFER_LIST NetBufferLists,
    _In_ ULONG NumberOfNetBufferLists,
    _In_ ULONG ReceiveFlags
    )
{
    BOOLEAN dispatch, sameSource;
    NDIS_SWITCH_PORT_ID sourcePortId;
    PNDIS_SWITCH_FORWARDING_DETAIL_NET_BUFFER_LIST_INFO fwdDetail;
    ULONG returnFlags;
    NDIS_SWITCH_PORT_ID curSourcePort;
    PNET_BUFFER_LIST curNbl, nextNbl;
    ULONG numNbls;
    PNET_BUFFER_LIST dropNbl = NULL;
    PNET_BUFFER_LIST *curDropNbl = &dropNbl;
    NDIS_STRING filterReason;
    
    dispatch = NDIS_TEST_RECEIVE_AT_DISPATCH_LEVEL(ReceiveFlags);
    sameSource = NDIS_TEST_RECEIVE_FLAG(ReceiveFlags, NDIS_RECEIVE_FLAGS_SWITCH_SINGLE_SOURCE);
                          
    if (Switch->DataFlowState != SxSwitchRunning)
    {
        RtlInitUnicodeString(&filterReason, L"Extension Paused");
        
        returnFlags = (dispatch) ? NDIS_RETURN_FLAGS_DISPATCH_LEVEL : 0;
        returnFlags |= NDIS_RETURN_FLAGS_SWITCH_SINGLE_SOURCE;
        
        fwdDetail = NET_BUFFER_LIST_SWITCH_FORWARDING_DETAIL(NetBufferLists);
        
        if (sameSource)
        {
            sourcePortId = fwdDetail->SourcePortId;
            
            Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                                     Switch->NdisSwitchContext,
                                                     &SxExtensionGuid,
                                                     &SxExtensionFriendlyName,
                                                     sourcePortId,
                                                     NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                                     NumberOfNetBufferLists,
                                                     NetBufferLists,
                                                     &filterReason);
                                                     
            SxExtStartCompleteNetBufferListsEgress(Switch,
                                                   Switch->ExtensionContext,
                                                   NetBufferLists,
                                                   returnFlags);
        }
        else
        {
            curSourcePort = fwdDetail->SourcePortId;
            numNbls = 0;
            for (curNbl = NetBufferLists; curNbl != NULL; curNbl = nextNbl)
            {
                nextNbl = curNbl->Next;
                curNbl->Next = NULL;
                
                fwdDetail = NET_BUFFER_LIST_SWITCH_FORWARDING_DETAIL(curNbl);
                
                if(curSourcePort == fwdDetail->SourcePortId)
                {
                    *curDropNbl = curNbl;
                    curDropNbl = &(curNbl->Next);
                    ++numNbls;
                }
                else
                {
                    Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                                 Switch->NdisSwitchContext,
                                                 &SxExtensionGuid,
                                                 &SxExtensionFriendlyName,
                                                 curSourcePort,
                                                 NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                                 numNbls,
                                                 dropNbl,
                                                 &filterReason);
                     
                    SxExtStartCompleteNetBufferListsEgress(Switch,
                                                           Switch->ExtensionContext,
                                                           dropNbl,
                                                           returnFlags);

                    numNbls = 1;
                    dropNbl = curNbl;
                    curDropNbl = &(curNbl->Next);
                    curSourcePort = fwdDetail->SourcePortId;
                }
            }
            
            Switch->NdisSwitchHandlers.ReportFilteredNetBufferLists(
                                             Switch->NdisSwitchContext,
                                             &SxExtensionGuid,
                                             &SxExtensionFriendlyName,
                                             curSourcePort,
                                             NDIS_SWITCH_REPORT_FILTERED_NBL_FLAGS_IS_INCOMING,
                                             numNbls,
                                             dropNbl,
                                             &filterReason);
                 
            SxExtStartCompleteNetBufferListsEgress(Switch,
                                                   Switch->ExtensionContext,
                                                   dropNbl,
                                                   returnFlags);
        }             
        
        goto Cleanup;
    }
    
    NdisFIndicateReceiveNetBufferLists(Switch->NdisFilterHandle,
                                       NetBufferLists,
                                       NDIS_DEFAULT_PORT_NUMBER,
                                       NumberOfNetBufferLists,
                                       ReceiveFlags);
                                
Cleanup:
    return;
}

VOID
SxLibCompleteNetBufferListsEgress(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ PNET_BUFFER_LIST NetBufferLists,
    _In_ ULONG ReturnFlags
    )
{
    NdisFReturnNetBufferLists(Switch->NdisFilterHandle,
                              NetBufferLists,
                              ReturnFlags);
}


VOID
SxLibCompleteNetBufferListsIngress(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ PNET_BUFFER_LIST NetBufferLists,
    _In_ ULONG SendCompleteFlags
    )
{
    NdisFSendNetBufferListsComplete(Switch->NdisFilterHandle,
                                    NetBufferLists,
                                    SendCompleteFlags);
}

VOID
SxLibCompletedInjectedNetBufferLists(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ ULONG NumInjectedNetBufferLists
    )
{
    LONG subtract = -(LONG)NumInjectedNetBufferLists;
    InterlockedAdd(&Switch->PendingInjectedNblCount, subtract);
}


NDIS_STATUS
SxLibIssueOidRequest(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ NDIS_REQUEST_TYPE RequestType,
    _In_ NDIS_OID Oid,
    _In_opt_ PVOID InformationBuffer,
    _In_ ULONG InformationBufferLength,
    _In_ ULONG OutputBufferLength,
    _In_ ULONG MethodId,
    _In_ UINT Timeout,
    _Out_ PULONG BytesNeeded
    )
{
    NDIS_STATUS status;
    PSX_OID_REQUEST oidRequest;
    PNDIS_OID_REQUEST ndisOidRequest;
    ULONG bytesNeeded;
    BOOLEAN asyncCompletion;

    status = NDIS_STATUS_SUCCESS;
    oidRequest = NULL;
    bytesNeeded = 0;
    asyncCompletion = FALSE;

    NdisInterlockedIncrement(&Switch->PendingOidCount);

    if (Switch->ControlFlowState != SxSwitchAttached)
    {
        status = NDIS_STATUS_CLOSING;
        goto Cleanup;
    }

    //
    // Dynamically allocate filter request so that we can handle asynchronous
    // completion.
    //
    oidRequest = (PSX_OID_REQUEST)ExAllocatePoolWithTag(NonPagedPoolNx,
                                                        sizeof(SX_OID_REQUEST),
                                                        SxExtAllocationTag);
    if (oidRequest == NULL)
    {
        goto Cleanup;
    }

    NdisZeroMemory(oidRequest, sizeof(SX_OID_REQUEST));
    ndisOidRequest = &oidRequest->NdisOidRequest;
    NdisInitializeEvent(&oidRequest->ReqEvent);

    ndisOidRequest->Header.Type = NDIS_OBJECT_TYPE_OID_REQUEST;
    ndisOidRequest->Header.Revision = NDIS_OID_REQUEST_REVISION_1;
    ndisOidRequest->Header.Size = sizeof(NDIS_OID_REQUEST);
    ndisOidRequest->RequestType = RequestType;
    ndisOidRequest->Timeout = Timeout;

    switch (RequestType)
    {
    case NdisRequestQueryInformation:
         ndisOidRequest->DATA.QUERY_INFORMATION.Oid = Oid;
         ndisOidRequest->DATA.QUERY_INFORMATION.InformationBuffer =
             InformationBuffer;
         ndisOidRequest->DATA.QUERY_INFORMATION.InformationBufferLength =
             InformationBufferLength;
        break;

    case NdisRequestSetInformation:
         ndisOidRequest->DATA.SET_INFORMATION.Oid = Oid;
         ndisOidRequest->DATA.SET_INFORMATION.InformationBuffer =
             InformationBuffer;
         ndisOidRequest->DATA.SET_INFORMATION.InformationBufferLength =
             InformationBufferLength;
        break;

    case NdisRequestMethod:
         ndisOidRequest->DATA.METHOD_INFORMATION.Oid = Oid;
         ndisOidRequest->DATA.METHOD_INFORMATION.MethodId = MethodId;
         ndisOidRequest->DATA.METHOD_INFORMATION.InformationBuffer =
             InformationBuffer;
         ndisOidRequest->DATA.METHOD_INFORMATION.InputBufferLength =
             InformationBufferLength;
         ndisOidRequest->DATA.METHOD_INFORMATION.OutputBufferLength =
             OutputBufferLength;
         break;

    default:
        NT_ASSERT(FALSE);
        break;
    }

    ndisOidRequest->RequestId = (PVOID)SxExtOidRequestId;
    status = NdisFOidRequest(Switch->NdisFilterHandle, ndisOidRequest);

    if (status == NDIS_STATUS_PENDING)
    {
        asyncCompletion = TRUE;
        NdisWaitEvent(&oidRequest->ReqEvent, 0);
    }
    else
    {
        SxpNdisCompleteInternalOidRequest(Switch, ndisOidRequest, status);
    }

    bytesNeeded = oidRequest->BytesNeeded;
    status = oidRequest->Status;

Cleanup:

    if (BytesNeeded != NULL)
    {
        *BytesNeeded = bytesNeeded;
    }
    
    if (!asyncCompletion)
    {
        NdisInterlockedDecrement(&Switch->PendingOidCount);
    }
    
    if (oidRequest != NULL)
    {
        ExFreePoolWithTag(oidRequest, SxExtAllocationTag);
    }
    
    return status;
}


NDIS_STATUS
SxLibGetSwitchParametersUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _Out_ PNDIS_SWITCH_PARAMETERS SwitchParameters
    )
{
    NDIS_STATUS status;
    
    SwitchParameters->Header.Revision = NDIS_SWITCH_PARAMETERS_REVISION_1;
    SwitchParameters->Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
    SwitchParameters->Header.Size = sizeof(NDIS_SWITCH_PARAMETERS);
    
    status = SxLibIssueOidRequest(Switch,
                                  NdisRequestQueryInformation,
                                  OID_SWITCH_PARAMETERS,
                                  SwitchParameters,
                                  sizeof(NDIS_SWITCH_PARAMETERS),
                                  0,
                                  0,
                                  0,
                                  NULL);
                                  
    return status;
}


NDIS_STATUS
SxLibGetPortArrayUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _Out_ PNDIS_SWITCH_PORT_ARRAY *PortArray
    )
{
    NDIS_STATUS status = NDIS_STATUS_SUCCESS;
    ULONG BytesNeeded = 0;
    PNDIS_SWITCH_PORT_ARRAY portArray = NULL;
    ULONG arrayLength = 0;
    
    do 
    {
        if (portArray != NULL)
        {
            ExFreePoolWithTag(portArray, SxExtAllocationTag);
        }
        
        if (BytesNeeded != 0)
        {
            arrayLength = BytesNeeded;
            portArray = ExAllocatePoolWithTag(NonPagedPoolNx,
                                             arrayLength,
                                             SxExtAllocationTag);
            
            if (portArray == NULL)
            {
                status = NDIS_STATUS_RESOURCES;
                goto Cleanup;
            }
            
            portArray->Header.Revision = NDIS_SWITCH_PORT_ARRAY_REVISION_1;
            portArray->Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
            portArray->Header.Size = (USHORT)arrayLength;
        }
    
        status = SxLibIssueOidRequest(Switch,
                                      NdisRequestQueryInformation,
                                      OID_SWITCH_PORT_ARRAY,
                                      portArray,
                                      arrayLength,
                                      0,
                                      0,
                                      0,
                                      &BytesNeeded);
        
    } while(status == NDIS_STATUS_INVALID_LENGTH);
    
    *PortArray = portArray;
Cleanup:
    if (status != NDIS_STATUS_SUCCESS &&
        portArray != NULL)
    {
        ExFreePoolWithTag(portArray, SxExtAllocationTag);
    }
    
    return status;
}


NDIS_STATUS
SxLibGetNicArrayUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _Out_ PNDIS_SWITCH_NIC_ARRAY *NicArray
    )
{
    NDIS_STATUS status = NDIS_STATUS_SUCCESS;
    ULONG BytesNeeded = 0;
    PNDIS_SWITCH_NIC_ARRAY nicArray = NULL;
    ULONG arrayLength = 0;
    
    do 
    {
        if (nicArray != NULL)
        {
            ExFreePoolWithTag(nicArray, SxExtAllocationTag);
        }
        
        if (BytesNeeded != 0)
        {
            arrayLength = BytesNeeded;
            nicArray = ExAllocatePoolWithTag(NonPagedPoolNx,
                                             arrayLength,
                                             SxExtAllocationTag);
            
            if (nicArray == NULL)
            {
                status = NDIS_STATUS_RESOURCES;
                goto Cleanup;
            }
            
            nicArray->Header.Revision = NDIS_SWITCH_PORT_ARRAY_REVISION_1;
            nicArray->Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
            nicArray->Header.Size = (USHORT)arrayLength;
        }
    
        status = SxLibIssueOidRequest(Switch,
                                      NdisRequestQueryInformation,
                                      OID_SWITCH_NIC_ARRAY,
                                      nicArray,
                                      arrayLength,
                                      0,
                                      0,
                                      0,
                                      &BytesNeeded);
        
    } while(status == NDIS_STATUS_INVALID_LENGTH);
    
    *NicArray = nicArray;
Cleanup:
    if (status != NDIS_STATUS_SUCCESS &&
        nicArray != NULL)
    {
        ExFreePoolWithTag(nicArray, SxExtAllocationTag);
    }
    
    return status;
}


NDIS_STATUS
SxLibGetSwitchPropertyUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ NDIS_SWITCH_PROPERTY_TYPE PropertyType,
    _In_opt_ PNDIS_SWITCH_OBJECT_ID PropertyId,
    _Outptr_ PNDIS_SWITCH_PROPERTY_ENUM_PARAMETERS *SwitchPropertyEnumParameters
    )
{
    NDIS_STATUS status = NDIS_STATUS_SUCCESS;
    NDIS_SWITCH_PROPERTY_ENUM_PARAMETERS propertyParameters;
    ULONG bytesNeeded = 0;
    PNDIS_SWITCH_PROPERTY_ENUM_PARAMETERS outputBuffer = NULL;
    USHORT outputBufferLength = sizeof(NDIS_SWITCH_PROPERTY_ENUM_PARAMETERS);
    
    propertyParameters.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
    propertyParameters.Header.Revision = NDIS_SWITCH_PROPERTY_ENUM_PARAMETERS_REVISION_1;
    
    propertyParameters.PropertyType = PropertyType;
    propertyParameters.SerializationVersion = NDIS_SWITCH_OBJECT_SERIALIZATION_VERSION_1;
    
    //
    // For Built-in properties, the ID is unnecessary.
    //
    if (PropertyId != NULL)
    {
        NdisMoveMemory(&propertyParameters.PropertyId,
                       PropertyId,
                       sizeof(NDIS_SWITCH_OBJECT_ID));
    }
    else
    {
        ASSERT(PropertyType != NdisSwitchPropertyTypeCustom);
    }
    
    outputBuffer = ExAllocatePoolWithTag(NonPagedPoolNx,
                                         outputBufferLength,
                                         SxExtAllocationTag);
                                         
    if (outputBuffer == NULL)
    {
        status = NDIS_STATUS_RESOURCES;
        goto Cleanup;
    }
    
    do 
    {
        if (bytesNeeded != 0)
        {
            ExFreePoolWithTag(outputBuffer, SxExtAllocationTag);

            outputBufferLength = (USHORT)bytesNeeded;
            outputBuffer = ExAllocatePoolWithTag(NonPagedPoolNx,
                                                 outputBufferLength,
                                                 SxExtAllocationTag);
            
            if (outputBuffer == NULL)
            {
                status = NDIS_STATUS_RESOURCES;
                goto Cleanup;
            }
        }
        
        if(outputBufferLength >= sizeof(propertyParameters))
        {
            NdisMoveMemory(outputBuffer, &propertyParameters, sizeof(propertyParameters));
            
        }
    
        status = SxLibIssueOidRequest(Switch,
                                      NdisRequestMethod,
                                      OID_SWITCH_PROPERTY_ENUM,
                                      outputBuffer,
                                      sizeof(propertyParameters),
                                      outputBufferLength,
                                      0,
                                      0,
                                      &bytesNeeded);
        
    } while(status == NDIS_STATUS_INVALID_LENGTH);
    
Cleanup:    
    if (status != NDIS_STATUS_SUCCESS &&
        outputBuffer != NULL)
    {
        ExFreePoolWithTag(outputBuffer, SxExtAllocationTag);
        outputBuffer = NULL;
    }
    
    *SwitchPropertyEnumParameters = outputBuffer;
    
    return status;
}


NDIS_STATUS
SxLibGetPortPropertyUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ NDIS_SWITCH_PORT_ID PortId,
    _In_ NDIS_SWITCH_PORT_PROPERTY_TYPE PropertyType,
    _In_opt_ PNDIS_SWITCH_OBJECT_ID PropertyId,
    _Outptr_ PNDIS_SWITCH_PORT_PROPERTY_ENUM_PARAMETERS *PortPropertyEnumParameters
    )
{
    NDIS_STATUS status = NDIS_STATUS_SUCCESS;
    NDIS_SWITCH_PORT_PROPERTY_ENUM_PARAMETERS propertyParameters;
    ULONG bytesNeeded = 0;
    PNDIS_SWITCH_PORT_PROPERTY_ENUM_PARAMETERS outputBuffer = NULL;
    USHORT outputBufferLength = sizeof(NDIS_SWITCH_PORT_PROPERTY_ENUM_PARAMETERS);
    
    propertyParameters.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
    propertyParameters.Header.Revision = NDIS_SWITCH_PORT_PROPERTY_ENUM_PARAMETERS_REVISION_1;
    
    propertyParameters.PortId = PortId;
    propertyParameters.PropertyType = PropertyType;
    propertyParameters.SerializationVersion = NDIS_SWITCH_OBJECT_SERIALIZATION_VERSION_1;
    
    //
    // For Built-in properties, the ID is unnecessary.
    //
    if (PropertyId != NULL)
    {
        NdisMoveMemory(&propertyParameters.PropertyId,
                       PropertyId,
                       sizeof(NDIS_SWITCH_OBJECT_ID));
    }
    else
    {
        ASSERT(PropertyType != NdisSwitchPortPropertyTypeCustom);
    }
    
    outputBuffer = ExAllocatePoolWithTag(NonPagedPoolNx,
                                         outputBufferLength,
                                         SxExtAllocationTag);
                                         
    if (outputBuffer == NULL)
    {
        status = NDIS_STATUS_RESOURCES;
        goto Cleanup;
    }
    
    do 
    {
        if (bytesNeeded != 0)
        {
            ExFreePoolWithTag(outputBuffer, SxExtAllocationTag);

            outputBufferLength = (USHORT)bytesNeeded;
            outputBuffer = ExAllocatePoolWithTag(NonPagedPoolNx,
                                                 outputBufferLength,
                                                 SxExtAllocationTag);
            
            if (outputBuffer == NULL)
            {
                status = NDIS_STATUS_RESOURCES;
                goto Cleanup;
            }
        }
        
        if(outputBufferLength >= sizeof(propertyParameters))
        {
            outputBuffer->Header.Size = outputBufferLength;
            NdisMoveMemory(outputBuffer, &propertyParameters, sizeof(propertyParameters));
        }
    
        status = SxLibIssueOidRequest(Switch,
                                      NdisRequestMethod,
                                      OID_SWITCH_PORT_PROPERTY_ENUM,
                                      outputBuffer,
                                      sizeof(propertyParameters),
                                      outputBufferLength,
                                      0,
                                      0,
                                      &bytesNeeded);
        
    } while(status == NDIS_STATUS_INVALID_LENGTH);
    
Cleanup:
    if (status != NDIS_STATUS_SUCCESS &&
        outputBuffer != NULL)
    {
        ExFreePoolWithTag(outputBuffer, SxExtAllocationTag);
        outputBuffer = NULL;
    }
    
    *PortPropertyEnumParameters = outputBuffer;
    
    return status;
}


VOID
SxLibRevokeVfUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ NDIS_SWITCH_PORT_ID PortId
    )
{
    SxLibIssueNicStatusIndicationUnsafe(Switch,
                                        NDIS_STATUS_SWITCH_PORT_REMOVE_VF,
                                        PortId,
                                        NDIS_SWITCH_DEFAULT_NIC_INDEX,
                                        TRUE,
                                        NULL,
                                        0);
}


VOID
SxLibIssueNicStatusIndicationUnsafe(
    _In_ PSX_SWITCH_OBJECT Switch,
    _In_ NDIS_STATUS StatusCode,
    _In_ NDIS_SWITCH_PORT_ID PortId,
    _In_ NDIS_SWITCH_NIC_INDEX NicIndex,
    _In_ BOOLEAN IsDestination,
    _In_opt_ PVOID StatusBuffer,
    _In_ ULONG StatusBufferSize
    )
{
    NDIS_STATUS_INDICATION statusIndication;
    NDIS_STATUS_INDICATION wrappedIndication;
    NDIS_SWITCH_NIC_STATUS_INDICATION nicIndication;
    
    NdisZeroMemory(&wrappedIndication, sizeof(wrappedIndication));
    
    wrappedIndication.Header.Type = NDIS_OBJECT_TYPE_STATUS_INDICATION;
    wrappedIndication.Header.Revision = NDIS_STATUS_INDICATION_REVISION_1;
    wrappedIndication.Header.Size = NDIS_SIZEOF_STATUS_INDICATION_REVISION_1;
    
    wrappedIndication.SourceHandle = Switch->NdisFilterHandle;
    wrappedIndication.PortNumber = NDIS_DEFAULT_PORT_NUMBER;
    
    wrappedIndication.StatusCode = StatusCode;
    wrappedIndication.StatusBuffer = StatusBuffer;
    wrappedIndication.StatusBufferSize = StatusBufferSize;
    
    NdisZeroMemory(&nicIndication, sizeof(nicIndication));
    
    nicIndication.Header.Type = NDIS_OBJECT_TYPE_DEFAULT;
    nicIndication.Header.Revision = NDIS_SWITCH_NIC_STATUS_INDICATION_REVISION_1;
    nicIndication.Header.Size = NDIS_SIZEOF_SWITCH_NIC_STATUS_REVISION_1;
    nicIndication.StatusIndication = &wrappedIndication;
    
    if (IsDestination)
    {
        nicIndication.DestinationPortId = PortId;
        nicIndication.DestinationNicIndex = NicIndex;
    }
    else
    {
        nicIndication.SourcePortId = PortId;
        nicIndication.SourceNicIndex = NicIndex;
    }
    
    NdisZeroMemory(&statusIndication, sizeof(statusIndication));
    
    statusIndication.Header.Type = NDIS_OBJECT_TYPE_STATUS_INDICATION;
    statusIndication.Header.Revision = NDIS_STATUS_INDICATION_REVISION_1;
    statusIndication.Header.Size = NDIS_SIZEOF_STATUS_INDICATION_REVISION_1;
    
    statusIndication.SourceHandle = Switch->NdisFilterHandle;
    statusIndication.PortNumber = NDIS_DEFAULT_PORT_NUMBER;
    
    statusIndication.StatusCode = NDIS_STATUS_SWITCH_NIC_STATUS;
    statusIndication.StatusBuffer = &nicIndication;
    statusIndication.StatusBufferSize = sizeof(nicIndication);
    
    NdisFIndicateStatus(Switch->NdisFilterHandle,
                        &statusIndication);
}

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