IRP
是I/O request
packet的縮寫，即I/O請求包。驅動與驅動之間通過IRP進行通信。而使用驅動的應用層調用的
CreatFile,ReadFile,WriteFile,DeviceIoControl等函數，說到底也是使用IRP和驅動進行通信。
一個
IRP由兩部分組成。首先是頭部或者叫包的固定部分，是一個IRP結構。緊跟在這個頭部之後的是I/O stack locations
，這是一個IO_STACK_LOCATION結構的數組，這個數組中元素的個數是根據情況而定的，由IoAllocateIrp( IN CCHAR
StackSize , IN BOOLEAN ChargeQuota )
時的參數StackSize決定。而StackSize通常由IRP發往的目標DEVICE_OBJECT的 +30 char
StackSize決定。而這個StackSize是由設備對象連入所在的設備棧時，根據在設備棧中位置決定的。我們先看看IRP結構和
IO_STACK_LOCATION結構的定義。
IRP結構定義如下
struct _IRP (sizeof=112)
+00 int16 Type
+02 uint16 Size
+04 struct _MDL *MdlAddress
+08 uint32 Flags
+0c union __unnamed14 AssociatedIrp
+0c struct _IRP *MasterIrp
+0c int32 IrpCount
+0c void *SystemBuffer
+10 struct _LIST_ENTRY ThreadListEntry
+10 struct _LIST_ENTRY *Flink
+14 struct _LIST_ENTRY *Blink
+18 struct _IO_STATUS_BLOCK IoStatus
+18 int32 Status
+18 void *Pointer
+1c uint32 Information
+20 char RequestorMode
+21 byte PendingReturned
+22 char StackCount
+23 char CurrentLocation
+24 byte Cancel
+25 byte CancelIrql
+26 char ApcEnvironment
+27 byte AllocationFlags
+28 struct _IO_STATUS_BLOCK *UserIosb
+2c struct _KEVENT *UserEvent
+30 union __unnamed15 Overlay
+30 struct __unnamed16 AsynchronousParameters
+30 function *UserApcRoutine
+34 void *UserApcContext
+30 union _LARGE_INTEGER AllocationSize
+30 uint32 LowPart
+34 int32 HighPart
+30 struct __unnamed3 u
+30 uint32 LowPart
+34 int32 HighPart
+30 int64 QuadPart
+38 function *CancelRoutine
+3c void *UserBuffer
+40 union __unnamed17 Tail
+40 struct __unnamed18 Overlay
+40 struct _KDEVICE_QUEUE_ENTRY DeviceQueueEntry
+40 struct _LIST_ENTRY DeviceListEntry
+40 struct _LIST_ENTRY *Flink
+44 struct _LIST_ENTRY *Blink
+48 uint32 SortKey
+4c byte Inserted
+40 void *DriverContext[4]
+50 struct _ETHREAD *Thread
+54 char *AuxiliaryBuffer
+58 struct _LIST_ENTRY ListEntry
+58 struct _LIST_ENTRY *Flink
+5c struct _LIST_ENTRY *Blink
+60 struct _IO_STACK_LOCATION *CurrentStackLocation
+60 uint32 PacketType
+64 struct _FILE_OBJECT *OriginalFileObject
+40 struct _KAPC Apc
+40 int16 Type
+42 int16 Size
+44 uint32 Spare0
+48 struct _KTHREAD *Thread
+4c struct _LIST_ENTRY ApcListEntry
+4c struct _LIST_ENTRY *Flink
+50 struct _LIST_ENTRY *Blink
+54 function *KernelRoutine
+58 function *RundownRoutine
+5c function *NormalRoutine
+60 void *NormalContext
+64 void *SystemArgument1
+68 void *SystemArgument2
+6c char ApcStateIndex
+6d char ApcMode
+6e byte Inserted
+40 void *CompletionKey
IO_STACK_LOCATION結構定義如下
struct _IO_STACK_LOCATION (sizeof=36)
+00 byte MajorFunction
+01 byte MinorFunction
+02 byte Flags
+03 byte Control
+04 union __unnamed19 Parameters
+04 struct __unnamed20 Create
+04 struct _IO_SECURITY_CONTEXT *SecurityContext
+08 uint32 Options
+0c uint16 FileAttributes
+0e uint16 ShareAccess
+10 uint32 EaLength
+04 struct __unnamed21 CreatePipe
+04 struct _IO_SECURITY_CONTEXT *SecurityContext
+08 uint32 Options
+0c uint16 Reserved
+0e uint16 ShareAccess
+10 struct _NAMED_PIPE_CREATE_PARAMETERS *Parameters
+04 struct __unnamed22 CreateMailslot
+04 struct _IO_SECURITY_CONTEXT *SecurityContext
+08 uint32 Options
+0c uint16 Reserved
+0e uint16 ShareAccess
+10 struct _MAILSLOT_CREATE_PARAMETERS *Parameters
+04 struct __unnamed23 Read
+04 uint32 Length
+08 uint32 Key
+0c union _LARGE_INTEGER ByteOffset
+0c uint32 LowPart
+10 int32 HighPart
+0c struct __unnamed3 u
+0c uint32 LowPart
+10 int32 HighPart
+0c int64 QuadPart
+04 struct __unnamed23 Write
+04 uint32 Length
+08 uint32 Key
+0c union _LARGE_INTEGER ByteOffset
+0c uint32 LowPart
+10 int32 HighPart
+0c struct __unnamed3 u
+0c uint32 LowPart
+10 int32 HighPart
+0c int64 QuadPart
+04 struct __unnamed24 QueryDirectory
+04 uint32 Length
+08 struct _STRING *FileName
+0c int32 FileInformationClass
+10 uint32 FileIndex
+04 struct __unnamed25 NotifyDirectory
+04 uint32 Length
+08 uint32 CompletionFilter
+04 struct __unnamed26 QueryFile
+04 uint32 Length
+08 int32 FileInformationClass
+04 struct __unnamed27 SetFile
+04 uint32 Length
+08 int32 FileInformationClass
+0c struct _FILE_OBJECT *FileObject
+10 byte ReplaceIfExists
+11 byte AdvanceOnly
+10 uint32 ClusterCount
+10 void *DeleteHandle
+04 struct __unnamed28 QueryEa
+04 uint32 Length
+08 void *EaList
+0c uint32 EaListLength
+10 uint32 EaIndex
+04 struct __unnamed29 SetEa
+04 uint32 Length
+04 struct __unnamed30 QueryVolume
+04 uint32 Length
+08 int32 FsInformationClass
+04 struct __unnamed30 SetVolume
+04 uint32 Length
+08 int32 FsInformationClass
+04 struct __unnamed31 FileSystemControl
+04 uint32 OutputBufferLength
+08 uint32 InputBufferLength
+0c uint32 FsControlCode
+10 void *Type3InputBuffer
+04 struct __unnamed32 LockControl
+04 union _LARGE_INTEGER *Length
+08 uint32 Key
+0c union _LARGE_INTEGER ByteOffset
+0c uint32 LowPart
+10 int32 HighPart
+0c struct __unnamed3 u
+0c uint32 LowPart
+10 int32 HighPart
+0c int64 QuadPart
+04 struct __unnamed33 DeviceIoControl
+04 uint32 OutputBufferLength
+08 uint32 InputBufferLength
+0c uint32 IoControlCode
+10 void *Type3InputBuffer
+04 struct __unnamed34 QuerySecurity
+04 uint32 SecurityInformation
+08 uint32 Length
+04 struct __unnamed35 SetSecurity
+04 uint32 SecurityInformation
+08 void *SecurityDescriptor
+04 struct __unnamed36 MountVolume
+04 struct _VPB *Vpb
+08 struct _DEVICE_OBJECT *DeviceObject
+04 struct __unnamed36 VerifyVolume
+04 struct _VPB *Vpb
+08 struct _DEVICE_OBJECT *DeviceObject
+04 struct __unnamed37 Scsi
+04 *Srb
+04 struct __unnamed38 QueryQuota
+04 uint32 Length
+08 void *StartSid
+0c struct _FILE_GET_QUOTA_INFORMATION *SidList
+10 uint32 SidListLength
+04 struct __unnamed29 SetQuota
+04 uint32 Length
+04 struct __unnamed39 QueryDeviceRelations
+04 int32 Type
+04 struct __unnamed40 QueryInterface
+04 struct _GUID *InterfaceType
+08 uint16 Size
+0a uint16 Version
+0c struct _INTERFACE *Interface
+10 void *InterfaceSpecificData
+04 struct __unnamed41 DeviceCapabilities
+04 struct _DEVICE_CAPABILITIES *Capabilities
+04 struct __unnamed42 FilterResourceRequirements
+04 struct _IO_RESOURCE_REQUIREMENTS_LIST *IoResourceRequirementList
+04 struct __unnamed51 ReadWriteConfig
+04 uint32 WhichSpace
+08 void *Buffer
+0c uint32 Offset
+10 uint32 Length
+04 struct __unnamed52 SetLock
+04 byte Lock
+04 struct __unnamed53 QueryId
+04 int32 IdType
+04 struct __unnamed54 QueryDeviceText
+04 int32 DeviceTextType
+08 uint32 LocaleId
+04 struct __unnamed55 UsageNotification
+04 byte InPath
+05 byte Reserved[3]
+08 int32 Type
+04 struct __unnamed56 WaitWake
+04 int32 PowerState
+04 struct __unnamed57 PowerSequence
+04 struct _POWER_SEQUENCE *PowerSequence
+04 struct __unnamed58 Power
+04 uint32 SystemContext
+08 int32 Type
+0c union _POWER_STATE State
+0c int32 SystemState
+0c int32 DeviceState
+10 int32 ShutdownType
+04 struct __unnamed59 StartDevice
+04 struct _CM_RESOURCE_LIST *AllocatedResources
+08 struct _CM_RESOURCE_LIST *AllocatedResourcesTranslated
+04 struct __unnamed60 WMI
+04 uint32 ProviderId
+08 void *DataPath
+0c uint32 BufferSize
+10 void *Buffer
+04 struct __unnamed61 Others
+04 void *Argument1
+08 void *Argument2
+0c void *Argument3
+10 void *Argument4
+14 struct _DEVICE_OBJECT *DeviceObject
+18 struct _FILE_OBJECT *FileObject
+1c function *CompletionRoutine
+20 void *Context
FILE_OBJECT結構定義如下
+0x000 Type : Int2B
+0x002 Size : Int2B
+0x004 DeviceObject : Ptr32 _DEVICE_OBJECT
+0x008 Vpb : Ptr32 _VPB
+0x00c FsContext : Ptr32 Void
+0x010 FsContext2 : Ptr32 Void
+0x014 SectionObjectPointer : Ptr32 _SECTION_OBJECT_POINTERS
+0x018 PrivateCacheMap : Ptr32 Void
+0x01c FinalStatus : Int4B
+0x020 RelatedFileObject : Ptr32 _FILE_OBJECT
+0x024 LockOperation : UChar
+0x025 DeletePending : UChar
+0x026 ReadAccess : UChar
+0x027 WriteAccess : UChar
+0x028 DeleteAccess : UChar
+0x029 SharedRead : UChar
+0x02a SharedWrite : UChar
+0x02b SharedDelete : UChar
+0x02c Flags : Uint4B
+0x030 FileName : _UNICODE_STRING
+0x038 CurrentByteOffset : _LARGE_INTEGER
+0x040 Waiters : Uint4B
+0x044 Busy : Uint4B
+0x048 LastLock : Ptr32 Void
+0x04c Lock : _KEVENT
+0x05c Event : _KEVENT
+0x06c CompletionContext : Ptr32 _IO_COMPLETION_CONTEXT
UNICODE_STRING結構定義如下
+0x000 Length : Uint2B
+0x002 MaximumLength : Uint2B
+0x004 Buffer : Ptr32 Uint2B
DRIVER_OBJECT結構定義如下+0x000 Type : Int2B
+0x002 Size : Int2B
+0x004 DeviceObject : Ptr32 _DEVICE_OBJECT
+0x008 Flags : Uint4B
+0x00c DriverStart : Ptr32 Void
+0x010 DriverSize : Uint4B
+0x014 DriverSection : Ptr32 Void
+0x018 DriverExtension : Ptr32 _DRIVER_EXTENSION
+0x01c DriverName : _UNICODE_STRING
+0x024 HardwareDatabase : Ptr32 _UNICODE_STRING
+0x028 FastIoDispatch : Ptr32 _FAST_IO_DISPATCH
+0x02c DriverInit : Ptr32 long
+0x030 DriverStartIo : Ptr32 void
+0x034 DriverUnload : Ptr32 void
+0x038 MajorFunction : [28] Ptr32 long
DEVICE_OBJECT結構定義如下
+0x000 Type : Int2B
+0x002 Size : Uint2B
+0x004 ReferenceCount : Int4B
+0x008 DriverObject : Ptr32 _DRIVER_OBJECT
+0x00c NextDevice : Ptr32 _DEVICE_OBJECT
+0x010 AttachedDevice : Ptr32 _DEVICE_OBJECT
+0x014 CurrentIrp : Ptr32 _IRP
+0x018 Timer : Ptr32 _IO_TIMER
+0x01c Flags : Uint4B
+0x020 Characteristics : Uint4B
+0x024 Vpb : Ptr32 _VPB
+0x028 DeviceExtension : Ptr32 Void
+0x02c DeviceType : Uint4B
+0x030 StackSize : Char
+0x034 Queue : __unnamed
+0x05c AlignmentRequirement : Uint4B
+0x060 DeviceQueue : _KDEVICE_QUEUE
+0x074 Dpc : _KDPC
+0x094 ActiveThreadCount : Uint4B
+0x098 SecurityDescriptor : Ptr32 Void
+0x09c DeviceLock : _KEVENT
+0x0ac SectorSize : Uint2B
+0x0ae Spare1 : Uint2B
+0x0b0 DeviceObjectExtension : Ptr32 _DEVOBJ_EXTENSION
+0x0b4 Reserved : Ptr32 Void
IO_STATUS_BLOCK結構定義如下
+0x000 Status : Int4B
+0x000 Pointer : Ptr32 Void
+0x004 Information : Uint4B
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