fltmgrint.h

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#ifndef _FLTMGR_INTERNAL_H
#define _FLTMGR_INTERNAL_H


#define MAX_CONTEXT_TYPES   6


typedef enum _FLT_OBJECT_FLAGS
{
    FLT_OBFL_DRAINING = 1,
    FLT_OBFL_ZOMBIED = 2,
    FLT_OBFL_TYPE_INSTANCE = 0x1000000,
    FLT_OBFL_TYPE_FILTER = 0x2000000,
    FLT_OBFL_TYPE_VOLUME = 0x4000000

} FLT_OBJECT_FLAGS, *PFLT_OBJECT_FLAGS;

typedef enum _FLT_FILTER_FLAGS
{
    FLTFL_MANDATORY_UNLOAD_IN_PROGRESS = 1,
    FLTFL_FILTERING_INITIATED = 2

} FLT_FILTER_FLAGS, *PFLT_FILTER_FLAGS;

typedef struct _FLT_OBJECT   // size = 0x14
{
    volatile FLT_OBJECT_FLAGS Flags;
    ULONG PointerCount;
    EX_RUNDOWN_REF RundownRef;
    LIST_ENTRY PrimaryLink;

} FLT_OBJECT, *PFLT_OBJECT;

typedef struct _ALLOCATE_CONTEXT_HEADER
{
    PFLT_FILTER Filter;
    PFLT_CONTEXT_CLEANUP_CALLBACK ContextCleanupCallback;
    struct _ALLOCATE_CONTEXT_HEADER *Next;
    FLT_CONTEXT_TYPE ContextType;
    char Flags;
    char AllocationType;

} ALLOCATE_CONTEXT_HEADER, *PALLOCATE_CONTEXT_HEADER;

typedef struct _FLT_RESOURCE_LIST_HEAD
{
    ERESOURCE rLock;
    LIST_ENTRY rList;
    ULONG rCount;

} FLT_RESOURCE_LIST_HEAD, *PFLT_RESOURCE_LIST_HEAD;

typedef struct _FLT_MUTEX_LIST_HEAD
{
    FAST_MUTEX mLock;
    LIST_ENTRY mList;
    ULONG mCount;

} FLT_MUTEX_LIST_HEAD, *PFLT_MUTEX_LIST_HEAD;

typedef struct _FLT_TYPE
{
    USHORT Signature;
    USHORT Size;

} FLT_TYPE, *PFLT_TYPE;

// http://fsfilters.blogspot.co.uk/2010/02/filter-manager-concepts-part-1.html
typedef struct _FLTP_FRAME
{
    FLT_TYPE Type;
    LIST_ENTRY Links;
    unsigned int FrameID;
    ERESOURCE AltitudeLock;
    UNICODE_STRING AltitudeIntervalLow;
    UNICODE_STRING AltitudeIntervalHigh;
    char LargeIrpCtrlStackSize;
    char SmallIrpCtrlStackSize;
    FLT_RESOURCE_LIST_HEAD RegisteredFilters;
    FLT_RESOURCE_LIST_HEAD AttachedVolumes;
    LIST_ENTRY MountingVolumes;
    FLT_MUTEX_LIST_HEAD AttachedFileSystems;
    FLT_MUTEX_LIST_HEAD ZombiedFltObjectContexts;
    ERESOURCE FilterUnloadLock;
    FAST_MUTEX DeviceObjectAttachLock;
    //FLT_PRCB *Prcb;
    void *PrcbPoolToFree;
    void *LookasidePoolToFree;
    //FLTP_IRPCTRL_STACK_PROFILER IrpCtrlStackProfiler;
    NPAGED_LOOKASIDE_LIST SmallIrpCtrlLookasideList;
    NPAGED_LOOKASIDE_LIST LargeIrpCtrlLookasideList;
    //STATIC_IRP_CONTROL GlobalSIC;

} FLTP_FRAME, *PFLTP_FRAME;

typedef struct _FLT_FILTER   // size = 0x120
{
    FLT_OBJECT Base;
    PFLTP_FRAME Frame;
    UNICODE_STRING Name;
    UNICODE_STRING DefaultAltitude;
    FLT_FILTER_FLAGS Flags;
    PDRIVER_OBJECT DriverObject;
    FLT_RESOURCE_LIST_HEAD InstanceList;
    PVOID VerifierExtension;
    PFLT_FILTER_UNLOAD_CALLBACK FilterUnload;
    PFLT_INSTANCE_SETUP_CALLBACK InstanceSetup;
    PFLT_INSTANCE_QUERY_TEARDOWN_CALLBACK InstanceQueryTeardown;
    PFLT_INSTANCE_TEARDOWN_CALLBACK InstanceTeardownStart;
    PFLT_INSTANCE_TEARDOWN_CALLBACK InstanceTeardownComplete;
    PALLOCATE_CONTEXT_HEADER SupportedContextsListHead;
    PALLOCATE_CONTEXT_HEADER SupportedContexts[MAX_CONTEXT_TYPES];
    PVOID PreVolumeMount;
    PVOID PostVolumeMount;
    PFLT_GENERATE_FILE_NAME GenerateFileName;
    PFLT_NORMALIZE_NAME_COMPONENT NormalizeNameComponent;
    PFLT_NORMALIZE_CONTEXT_CLEANUP NormalizeContextCleanup;
    PFLT_OPERATION_REGISTRATION Operations;
    PFLT_FILTER_UNLOAD_CALLBACK OldDriverUnload;
    FLT_MUTEX_LIST_HEAD ActiveOpens;
    FLT_MUTEX_LIST_HEAD ConnectionList;
    FLT_MUTEX_LIST_HEAD PortList;
    EX_PUSH_LOCK PortLock;

}  FLT_FILTER, *PFLT_FILTER;

typedef enum _FLT_yINSTANCE_FLAGS
{
    INSFL_CAN_BE_DETACHED = 0x01,
    INSFL_DELETING = 0x02,
    INSFL_INITING = 0x04

} FLT_INSTANCE_FLAGS, *PFLT_INSTANCE_FLAGS;



typedef struct _FLT_INSTANCE   // size = 0x144 (324)
{
    FLT_OBJECT Base;
    ULONG OperationRundownRef;
    PVOID Volume; //PFLT_VOLUME
    PFLT_FILTER Filter;
    FLT_INSTANCE_FLAGS Flags;
    UNICODE_STRING Altitude;
    UNICODE_STRING Name;
    LIST_ENTRY FilterLink;
    ERESOURCE ContextLock;
    PVOID Context; //PCONTEXT_NODE
    PVOID TrackCompletionNodes; //PRACK_COMPLETION_NODES
    PVOID CallbackNodes[50]; //PCALLBACK_NODE

} FLT_INSTANCE, *PFLT_INSTANCE;


typedef struct _TREE_ROOT
{
    RTL_SPLAY_LINKS *Tree;

} TREE_ROOT, *PTREE_ROOT;

typedef struct _CONTEXT_LIST_CTRL
{
    TREE_ROOT List;

} CONTEXT_LIST_CTRL, *PCONTEXT_LIST_CTRL;

// http://fsfilters.blogspot.co.uk/2010/02/filter-manager-concepts-part-6.html
typedef struct _STREAM_LIST_CTRL // size = 0xC8 (200)
{
    FLT_TYPE Type;
    FSRTL_PER_STREAM_CONTEXT ContextCtrl;
    LIST_ENTRY VolumeLink;
    ULONG Flags; //STREAM_LIST_CTRL_FLAGS Flags;
    int UseCount;
    ERESOURCE ContextLock;
    CONTEXT_LIST_CTRL StreamContexts;
    CONTEXT_LIST_CTRL StreamHandleContexts;
    ERESOURCE NameCacheLock;
    LARGE_INTEGER LastRenameCompleted;
    ULONG NormalizedNameCache; //NAME_CACHE_LIST_CTRL NormalizedNameCache;
    ULONG ShortNameCache; // NAME_CACHE_LIST_CTRL ShortNameCache;
    ULONG OpenedNameCache; // NAME_CACHE_LIST_CTRL OpenedNameCache;
    int AllNameContextsTemporary;

} STREAM_LIST_CTRL, *PSTREAM_LIST_CTRL;


typedef struct _FLT_SERVER_PORT_OBJECT
{
    LIST_ENTRY FilterLink;
    PFLT_CONNECT_NOTIFY ConnectNotify;
    PFLT_DISCONNECT_NOTIFY DisconnectNotify;
    PFLT_MESSAGE_NOTIFY MessageNotify;
    PFLT_FILTER Filter;
    PVOID Cookie;
    ULONG Flags;
    LONG NumberOfConnections;
    LONG MaxConnections;

} FLT_SERVER_PORT_OBJECT, *PFLT_SERVER_PORT_OBJECT;


typedef struct _FLT_MESSAGE_WAITER_QUEUE
{
    IO_CSQ Csq;
    FLT_MUTEX_LIST_HEAD WaiterQ;
    ULONG MinimumWaiterLength;
    KSEMAPHORE Semaphore;
    KEVENT Event;

} FLT_MESSAGE_WAITER_QUEUE, *PFLT_MESSAGE_WAITER_QUEUE;


typedef struct _FLT_PORT_OBJECT
{
    LIST_ENTRY FilterLink;
    PFLT_SERVER_PORT_OBJECT ServerPort;
    PVOID Cookie;
    EX_RUNDOWN_REF MsgNotifRundownRef;
    FAST_MUTEX Lock;
    FLT_MESSAGE_WAITER_QUEUE MsgQ;
    ULONGLONG MessageId;
    KEVENT DisconnectEvent;
    BOOLEAN Disconnected;

} FLT_PORT_OBJECT, *PFLT_PORT_OBJECT;


typedef enum _FLT_VOLUME_FLAGS
{
    VOLFL_NETWORK_FILESYSTEM = 0x1,
    VOLFL_PENDING_MOUNT_SETUP_NOTIFIES = 0x2,
    VOLFL_MOUNT_SETUP_NOTIFIES_CALLED = 0x4,
    VOLFL_MOUNTING = 0x8,
    VOLFL_SENT_SHUTDOWN_IRP = 0x10,
    VOLFL_ENABLE_NAME_CACHING = 0x20,
    VOLFL_FILTER_EVER_ATTACHED = 0x40,
    VOLFL_STANDARD_LINK_NOT_SUPPORTED = 0x80

} FLT_VOLUME_FLAGS, *PFLT_VOLUME_FLAGS;


typedef enum _CALLBACK_NODE_FLAGS
{
    CBNFL_SKIP_PAGING_IO = 0x1,
    CBNFL_SKIP_CACHED_IO = 0x2,
    CBNFL_USE_NAME_CALLBACK_EX = 0x4,
    CBNFL_SKIP_NON_DASD_IO = 0x8

} CALLBACK_NODE_FLAGS, *PCALLBACK_NODE_FLAGS;


typedef struct _CALLBACK_CTRL
{
    LIST_ENTRY OperationLists[50];
    CALLBACK_NODE_FLAGS OperationFlags[50];

} CALLBACK_CTRL, *PCALLBACK_CTRL;


typedef struct _NAME_CACHE_LIST_CTRL_STATS
{
    ULONG Searches;
    ULONG Hits;
    ULONG Created;
    ULONG Temporary;
    ULONG Duplicate;
    ULONG Removed;
    ULONG RemovedDueToCase;

} NAME_CACHE_LIST_CTRL_STATS, *PNAME_CACHE_LIST_CTRL_STATS;


typedef struct _NAME_CACHE_VOLUME_CTRL_STATS
{
    ULONG AllContextsTemporary;
    ULONG PurgeNameCache;
    NAME_CACHE_LIST_CTRL_STATS NormalizedNames;
    NAME_CACHE_LIST_CTRL_STATS OpenedNames;
    NAME_CACHE_LIST_CTRL_STATS ShortNames;
    ULONG AncestorLookup;
    ULONG ParentHit;
    ULONG NonParentHit;

} NAME_CACHE_VOLUME_CTRL_STATS, *PNAME_CACHE_VOLUME_CTRL_STATS;


typedef struct _NAME_CACHE_VOLUME_CTRL
{
    FAST_MUTEX Lock;
    ULONG AllContextsTemporary;
    LARGE_INTEGER LastRenameCompleted;
    NAME_CACHE_VOLUME_CTRL_STATS Stats;

} NAME_CACHE_VOLUME_CTRL, *PNAME_CACHE_VOLUME_CTRL;


typedef struct _FLT_VOLUME
{
    FLT_OBJECT Base;
    FLT_VOLUME_FLAGS Flags;
    FLT_FILESYSTEM_TYPE FileSystemType;
    PDEVICE_OBJECT DeviceObject;
    PDEVICE_OBJECT DiskDeviceObject;
    PFLT_VOLUME FrameZeroVolume;
    PFLT_VOLUME VolumeInNextFrame;
    PFLTP_FRAME Frame;
    UNICODE_STRING DeviceName;
    UNICODE_STRING GuidName;
    UNICODE_STRING CDODeviceName;
    UNICODE_STRING CDODriverName;
    FLT_RESOURCE_LIST_HEAD InstanceList;
    CALLBACK_CTRL Callbacks;
    EX_PUSH_LOCK ContextLock;
    CONTEXT_LIST_CTRL VolumeContexts;
    FLT_RESOURCE_LIST_HEAD StreamListCtrls;
    FLT_RESOURCE_LIST_HEAD FileListCtrls;
    NAME_CACHE_VOLUME_CTRL NameCacheCtrl;
    ERESOURCE MountNotifyLock;
    ULONG TargetedOpenActiveCount;
    EX_PUSH_LOCK TxVolContextListLock;
    TREE_ROOT TxVolContexts;

} FLT_VOLUME, *PFLT_VOLUME;


typedef struct _MANAGER_CCB
{
    PFLTP_FRAME Frame;
    unsigned int Iterator;

} MANAGER_CCB, *PMANAGER_CCB;

typedef struct _FILTER_CCB
{
    PFLT_FILTER Filter;
    unsigned int Iterator;

} FILTER_CCB, *PFILTER_CCB;

typedef struct _INSTANCE_CCB
{
    PFLT_INSTANCE Instance;

} INSTANCE_CCB, *PINSTANCE_CCB;

typedef struct _VOLUME_CCB
{
    UNICODE_STRING Volume;
    unsigned int Iterator;

} VOLUME_CCB, *PVOLUME_CCB;

typedef struct _PORT_CCB
{
    PFLT_PORT_OBJECT Port;
    FLT_MUTEX_LIST_HEAD ReplyWaiterList;

} PORT_CCB, *PPORT_CCB;


typedef union _CCB_TYPE
{
    MANAGER_CCB Manager;
    FILTER_CCB Filter;
    INSTANCE_CCB Instance;
    VOLUME_CCB Volume;
    PORT_CCB Port;

} CCB_TYPE, *PCCB_TYPE;


typedef struct _FLT_CCB
{
    FLT_TYPE Type;
    CCB_TYPE Data;

} FLT_CCB, *PFLT_CCB;

VOID
FltpExInitializeRundownProtection(
    _Out_ PEX_RUNDOWN_REF RundownRef
);

BOOLEAN
FltpExAcquireRundownProtection(
    _Inout_ PEX_RUNDOWN_REF RundownRef
);

BOOLEAN
FltpExReleaseRundownProtection(
    _Inout_ PEX_RUNDOWN_REF RundownRef
);

NTSTATUS
NTAPI
FltpObjectRundownWait(
    _Inout_ PEX_RUNDOWN_REF RundownRef
);

BOOLEAN
FltpExRundownCompleted(
    _Inout_ PEX_RUNDOWN_REF RundownRef
);


NTSTATUS
FltpGetBaseDeviceObjectName(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PUNICODE_STRING ObjectName
);

NTSTATUS
FltpGetObjectName(
    _In_ PVOID Object,
    _Inout_ PUNICODE_STRING ObjectName
);

ULONG
FltpObjectPointerReference(
    _In_ PFLT_OBJECT Object
);

VOID
FltpObjectPointerDereference(
    _In_ PFLT_OBJECT Object
);

NTSTATUS
FltpReallocateUnicodeString(
    _In_ PUNICODE_STRING String,
    _In_ SIZE_T NewLength,
    _In_ BOOLEAN CopyExisting
);

VOID
FltpFreeUnicodeString(
    _In_ PUNICODE_STRING String
);



NTSTATUS
FltpDeviceControlHandler(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PIRP Irp
);

NTSTATUS
FltpDispatchHandler(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PIRP Irp
);

NTSTATUS
FltpMsgCreate(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PIRP Irp
);

NTSTATUS
FltpMsgDispatch(
    _In_ PDEVICE_OBJECT DeviceObject,
    _Inout_ PIRP Irp
);

NTSTATUS
FltpSetupCommunicationObjects(
    _In_ PDRIVER_OBJECT DriverObject
);

#endif /* _FLTMGR_INTERNAL_H */