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/*++
*
* The file contains the routines to create a device and handle ioctls
*
-- */
#include "precomp.h"
#pragma NDIS_INIT_FUNCTION(FilterRegisterDevice)
_IRQL_requires_max_(PASSIVE_LEVEL)
NDIS_STATUS
FilterRegisterDevice(
VOID
)
{
NDIS_STATUS Status = NDIS_STATUS_SUCCESS;
UNICODE_STRING DeviceName;
UNICODE_STRING DeviceLinkUnicodeString;
PDRIVER_DISPATCH DispatchTable[IRP_MJ_MAXIMUM_FUNCTION+1];
NDIS_DEVICE_OBJECT_ATTRIBUTES DeviceAttribute;
PFILTER_DEVICE_EXTENSION FilterDeviceExtension;
DEBUGP(DL_TRACE, "==>FilterRegisterDevice\n");
NdisZeroMemory(DispatchTable, (IRP_MJ_MAXIMUM_FUNCTION+1) * sizeof(PDRIVER_DISPATCH));
DispatchTable[IRP_MJ_CREATE] = FilterDispatch;
DispatchTable[IRP_MJ_CLEANUP] = FilterDispatch;
DispatchTable[IRP_MJ_CLOSE] = FilterDispatch;
DispatchTable[IRP_MJ_DEVICE_CONTROL] = FilterDeviceIoControl;
NdisInitUnicodeString(&DeviceName, NTDEVICE_STRING);
NdisInitUnicodeString(&DeviceLinkUnicodeString, LINKNAME_STRING);
//
// Create a device object and register our dispatch handlers
//
NdisZeroMemory(&DeviceAttribute, sizeof(NDIS_DEVICE_OBJECT_ATTRIBUTES));
DeviceAttribute.Header.Type = NDIS_OBJECT_TYPE_DEVICE_OBJECT_ATTRIBUTES;
DeviceAttribute.Header.Revision = NDIS_DEVICE_OBJECT_ATTRIBUTES_REVISION_1;
DeviceAttribute.Header.Size = sizeof(NDIS_DEVICE_OBJECT_ATTRIBUTES);
DeviceAttribute.DeviceName = &DeviceName;
DeviceAttribute.SymbolicName = &DeviceLinkUnicodeString;
DeviceAttribute.MajorFunctions = &DispatchTable[0];
DeviceAttribute.ExtensionSize = sizeof(FILTER_DEVICE_EXTENSION);
Status = NdisRegisterDeviceEx(
FilterDriverHandle,
&DeviceAttribute,
&NdisDeviceObject,
&NdisFilterDeviceHandle
);
if (Status == NDIS_STATUS_SUCCESS)
{
FilterDeviceExtension = NdisGetDeviceReservedExtension(NdisDeviceObject);
FilterDeviceExtension->Signature = 'FTDR';
FilterDeviceExtension->Handle = FilterDriverHandle;
}
DEBUGP(DL_TRACE, "<==FilterRegisterDevice: %x\n", Status);
return (Status);
}
_IRQL_requires_max_(PASSIVE_LEVEL)
VOID
FilterDeregisterDevice(
VOID
)
{
if (NdisFilterDeviceHandle != NULL)
{
NdisDeregisterDeviceEx(NdisFilterDeviceHandle);
}
NdisFilterDeviceHandle = NULL;
}
_Use_decl_annotations_
NTSTATUS
FilterDispatch(
PDEVICE_OBJECT DeviceObject,
PIRP Irp
)
{
PIO_STACK_LOCATION IrpStack;
NTSTATUS Status = STATUS_SUCCESS;
UNREFERENCED_PARAMETER(DeviceObject);
IrpStack = IoGetCurrentIrpStackLocation(Irp);
switch (IrpStack->MajorFunction)
{
case IRP_MJ_CREATE:
break;
case IRP_MJ_CLEANUP:
break;
case IRP_MJ_CLOSE:
break;
default:
break;
}
Irp->IoStatus.Status = Status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
_Use_decl_annotations_
NTSTATUS
FilterDeviceIoControl(
PDEVICE_OBJECT DeviceObject,
PIRP Irp
)
{
PIO_STACK_LOCATION IrpSp;
NTSTATUS Status = STATUS_SUCCESS;
PFILTER_DEVICE_EXTENSION FilterDeviceExtension;
PUCHAR InputBuffer;
PUCHAR OutputBuffer;
ULONG InputBufferLength, OutputBufferLength;
PLIST_ENTRY Link;
PUCHAR pInfo;
ULONG InfoLength = 0;
PMS_FILTER pFilter = NULL;
BOOLEAN bFalse = FALSE;
UNREFERENCED_PARAMETER(DeviceObject);
IrpSp = IoGetCurrentIrpStackLocation(Irp);
if (IrpSp->FileObject == NULL)
{
return(STATUS_UNSUCCESSFUL);
}
FilterDeviceExtension = (PFILTER_DEVICE_EXTENSION)NdisGetDeviceReservedExtension(DeviceObject);
ASSERT(FilterDeviceExtension->Signature == 'FTDR');
Irp->IoStatus.Information = 0;
switch (IrpSp->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_FILTER_RESTART_ALL:
break;
case IOCTL_FILTER_RESTART_ONE_INSTANCE:
InputBuffer = OutputBuffer = (PUCHAR)Irp->AssociatedIrp.SystemBuffer;
InputBufferLength = IrpSp->Parameters.DeviceIoControl.InputBufferLength;
pFilter = filterFindFilterModule (InputBuffer, InputBufferLength);
if (pFilter == NULL)
{
break;
}
NdisFRestartFilter(pFilter->FilterHandle);
break;
case IOCTL_FILTER_ENUMERATE_ALL_INSTANCES:
InputBuffer = OutputBuffer = (PUCHAR)Irp->AssociatedIrp.SystemBuffer;
InputBufferLength = IrpSp->Parameters.DeviceIoControl.InputBufferLength;
OutputBufferLength = IrpSp->Parameters.DeviceIoControl.OutputBufferLength;
pInfo = OutputBuffer;
FILTER_ACQUIRE_LOCK(&FilterListLock, bFalse);
Link = FilterModuleList.Flink;
while (Link != &FilterModuleList)
{
pFilter = CONTAINING_RECORD(Link, MS_FILTER, FilterModuleLink);
InfoLength += (pFilter->FilterModuleName.Length + sizeof(USHORT));
if (InfoLength <= OutputBufferLength)
{
*(PUSHORT)pInfo = pFilter->FilterModuleName.Length;
NdisMoveMemory(pInfo + sizeof(USHORT),
(PUCHAR)(pFilter->FilterModuleName.Buffer),
pFilter->FilterModuleName.Length);
pInfo += (pFilter->FilterModuleName.Length + sizeof(USHORT));
}
Link = Link->Flink;
}
FILTER_RELEASE_LOCK(&FilterListLock, bFalse);
if (InfoLength <= OutputBufferLength)
{
Status = NDIS_STATUS_SUCCESS;
}
//
// Buffer is small
//
else
{
Status = STATUS_BUFFER_TOO_SMALL;
}
break;
default:
break;
}
Irp->IoStatus.Status = Status;
Irp->IoStatus.Information = InfoLength;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
_IRQL_requires_max_(DISPATCH_LEVEL)
PMS_FILTER
filterFindFilterModule(
_In_reads_bytes_(BufferLength)
PUCHAR Buffer,
_In_ ULONG BufferLength
)
{
PMS_FILTER pFilter;
PLIST_ENTRY Link;
BOOLEAN bFalse = FALSE;
FILTER_ACQUIRE_LOCK(&FilterListLock, bFalse);
Link = FilterModuleList.Flink;
while (Link != &FilterModuleList)
{
pFilter = CONTAINING_RECORD(Link, MS_FILTER, FilterModuleLink);
if (BufferLength >= pFilter->FilterModuleName.Length)
{
if (NdisEqualMemory(Buffer, pFilter->FilterModuleName.Buffer, pFilter->FilterModuleName.Length))
{
FILTER_RELEASE_LOCK(&FilterListLock, bFalse);
return pFilter;
}
}
Link = Link->Flink;
}
FILTER_RELEASE_LOCK(&FilterListLock, bFalse);
return NULL;
}
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