[mirror_edk2.git] / NetworkPkg / Mtftp4Dxe / Mtftp4Driver.c

/** @file\r
  Implementation of Mtftp drivers.\r
\r
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "Mtftp4Impl.h"\r
\r
EFI_DRIVER_BINDING_PROTOCOL  gMtftp4DriverBinding = {\r
  Mtftp4DriverBindingSupported,\r
  Mtftp4DriverBindingStart,\r
  Mtftp4DriverBindingStop,\r
  0xa,\r
  NULL,\r
  NULL\r
};\r
\r
EFI_SERVICE_BINDING_PROTOCOL  gMtftp4ServiceBindingTemplete = {\r
  Mtftp4ServiceBindingCreateChild,\r
  Mtftp4ServiceBindingDestroyChild\r
};\r
\r
/**\r
  The driver entry point which installs multiple protocols to the ImageHandle.\r
\r
  @param ImageHandle    The MTFTP's image handle.\r
  @param SystemTable    The system table.\r
\r
  @retval EFI_SUCCESS  The handles are successfully installed on the image.\r
  @retval others       some EFI_ERROR occurred.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4DriverEntryPoint (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  return EfiLibInstallDriverBindingComponentName2 (\r
           ImageHandle,\r
           SystemTable,\r
           &gMtftp4DriverBinding,\r
           ImageHandle,\r
           &gMtftp4ComponentName,\r
           &gMtftp4ComponentName2\r
           );\r
}\r
\r
/**\r
  Test whether MTFTP driver support this controller.\r
\r
  @param  This                   The MTFTP driver binding instance\r
  @param  Controller             The controller to test\r
  @param  RemainingDevicePath    The remaining device path\r
\r
  @retval EFI_SUCCESS            The controller has UDP service binding protocol\r
                                 installed, MTFTP can support it.\r
  @retval EFI_ALREADY_STARTED    The device specified by ControllerHandle and\r
                                 RemainingDevicePath is already being managed by\r
                                 the driver specified by This.\r
  @retval EFI_ACCESS_DENIED      The device specified by ControllerHandle and\r
                                 RemainingDevicePath is already being managed by a\r
                                 different driver or an application that requires\r
                                 exclusive access.\r
  @retval EFI_UNSUPPORTED        The device specified by ControllerHandle and\r
                                 RemainingDevicePath is not supported by the driver\r
                                 specified by This.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4DriverBindingSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiUdp4ServiceBindingProtocolGuid,\r
                  NULL,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                  );\r
\r
  return Status;\r
}\r
\r
/**\r
  Config a NULL UDP that is used to keep the connection between UDP and MTFTP.\r
\r
  Just leave the Udp child unconfigured. When UDP is unloaded,\r
    MTFTP will be informed with DriverBinding Stop.\r
\r
  @param  UdpIo                  The UDP_IO to configure\r
  @param  Context                The opaque parameter to the callback\r
\r
  @retval EFI_SUCCESS            It always return EFI_SUCCESS directly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4ConfigNullUdp (\r
  IN UDP_IO  *UdpIo,\r
  IN VOID    *Context\r
  )\r
{\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Create then initialize a MTFTP service binding instance.\r
\r
  @param  Controller             The controller to install the MTFTP service\r
                                 binding on\r
  @param  Image                  The driver binding image of the MTFTP driver\r
  @param  Service                The variable to receive the created service\r
                                 binding instance.\r
\r
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resource to create the instance\r
  @retval EFI_DEVICE_ERROR       Failed to create a NULL UDP port to keep\r
                                 connection  with UDP.\r
  @retval EFI_SUCCESS            The service instance is created for the\r
                                 controller.\r
\r
**/\r
EFI_STATUS\r
Mtftp4CreateService (\r
  IN     EFI_HANDLE   Controller,\r
  IN     EFI_HANDLE   Image,\r
  OUT MTFTP4_SERVICE  **Service\r
  )\r
{\r
  MTFTP4_SERVICE  *MtftpSb;\r
  EFI_STATUS      Status;\r
\r
  *Service = NULL;\r
  MtftpSb  = AllocatePool (sizeof (MTFTP4_SERVICE));\r
\r
  if (MtftpSb == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  MtftpSb->Signature      = MTFTP4_SERVICE_SIGNATURE;\r
  MtftpSb->ServiceBinding = gMtftp4ServiceBindingTemplete;\r
  MtftpSb->ChildrenNum    = 0;\r
  InitializeListHead (&MtftpSb->Children);\r
\r
  MtftpSb->Timer            = NULL;\r
  MtftpSb->TimerNotifyLevel = NULL;\r
  MtftpSb->TimerToGetMap    = NULL;\r
  MtftpSb->Controller       = Controller;\r
  MtftpSb->Image            = Image;\r
  MtftpSb->ConnectUdp       = NULL;\r
\r
  //\r
  // Create the timer and a udp to be notified when UDP is uninstalled\r
  //\r
  Status = gBS->CreateEvent (\r
                  EVT_NOTIFY_SIGNAL | EVT_TIMER,\r
                  TPL_CALLBACK,\r
                  Mtftp4OnTimerTick,\r
                  MtftpSb,\r
                  &MtftpSb->Timer\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    FreePool (MtftpSb);\r
    return Status;\r
  }\r
\r
  Status = gBS->CreateEvent (\r
                  EVT_NOTIFY_SIGNAL | EVT_TIMER,\r
                  TPL_NOTIFY,\r
                  Mtftp4OnTimerTickNotifyLevel,\r
                  MtftpSb,\r
                  &MtftpSb->TimerNotifyLevel\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    gBS->CloseEvent (MtftpSb->Timer);\r
    FreePool (MtftpSb);\r
    return Status;\r
  }\r
\r
  //\r
  // Create the timer used to time out the procedure which is used to\r
  // get the default IP address.\r
  //\r
  Status = gBS->CreateEvent (\r
                  EVT_TIMER,\r
                  TPL_CALLBACK,\r
                  NULL,\r
                  NULL,\r
                  &MtftpSb->TimerToGetMap\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    gBS->CloseEvent (MtftpSb->TimerNotifyLevel);\r
    gBS->CloseEvent (MtftpSb->Timer);\r
    FreePool (MtftpSb);\r
    return Status;\r
  }\r
\r
  MtftpSb->ConnectUdp = UdpIoCreateIo (\r
                          Controller,\r
                          Image,\r
                          Mtftp4ConfigNullUdp,\r
                          UDP_IO_UDP4_VERSION,\r
                          NULL\r
                          );\r
\r
  if (MtftpSb->ConnectUdp == NULL) {\r
    gBS->CloseEvent (MtftpSb->TimerToGetMap);\r
    gBS->CloseEvent (MtftpSb->TimerNotifyLevel);\r
    gBS->CloseEvent (MtftpSb->Timer);\r
    FreePool (MtftpSb);\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  *Service = MtftpSb;\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Release all the resource used the MTFTP service binding instance.\r
\r
  @param  MtftpSb                The MTFTP service binding instance.\r
\r
**/\r
VOID\r
Mtftp4CleanService (\r
  IN MTFTP4_SERVICE  *MtftpSb\r
  )\r
{\r
  UdpIoFreeIo (MtftpSb->ConnectUdp);\r
  gBS->CloseEvent (MtftpSb->TimerToGetMap);\r
  gBS->CloseEvent (MtftpSb->TimerNotifyLevel);\r
  gBS->CloseEvent (MtftpSb->Timer);\r
}\r
\r
/**\r
  Start the MTFTP driver on this controller.\r
\r
  MTFTP driver will install a MTFTP SERVICE BINDING protocol on the supported\r
  controller, which can be used to create/destroy MTFTP children.\r
\r
  @param  This                   The MTFTP driver binding protocol.\r
  @param  Controller             The controller to manage.\r
  @param  RemainingDevicePath    Remaining device path.\r
\r
  @retval EFI_ALREADY_STARTED    The MTFTP service binding protocol has been\r
                                 started  on the controller.\r
  @retval EFI_SUCCESS            The MTFTP service binding is installed on the\r
                                 controller.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4DriverBindingStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath\r
  )\r
{\r
  MTFTP4_SERVICE  *MtftpSb;\r
  EFI_STATUS      Status;\r
\r
  //\r
  // Directly return if driver is already running.\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Controller,\r
                  &gEfiMtftp4ServiceBindingProtocolGuid,\r
                  NULL,\r
                  This->DriverBindingHandle,\r
                  Controller,\r
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                  );\r
\r
  if (Status == EFI_SUCCESS) {\r
    return EFI_ALREADY_STARTED;\r
  }\r
\r
  Status = Mtftp4CreateService (Controller, This->DriverBindingHandle, &MtftpSb);\r
\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  ASSERT (MtftpSb != NULL);\r
\r
  Status = gBS->SetTimer (MtftpSb->Timer, TimerPeriodic, TICKS_PER_SECOND);\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  Status = gBS->SetTimer (MtftpSb->TimerNotifyLevel, TimerPeriodic, TICKS_PER_SECOND);\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Install the Mtftp4ServiceBinding Protocol onto Controller\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &Controller,\r
                  &gEfiMtftp4ServiceBindingProtocolGuid,\r
                  &MtftpSb->ServiceBinding,\r
                  NULL\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  return EFI_SUCCESS;\r
\r
ON_ERROR:\r
  Mtftp4CleanService (MtftpSb);\r
  FreePool (MtftpSb);\r
\r
  return Status;\r
}\r
\r
/**\r
  Callback function which provided by user to remove one node in NetDestroyLinkList process.\r
\r
  @param[in]    Entry           The entry to be removed.\r
  @param[in]    Context         Pointer to the callback context corresponds to the Context in NetDestroyLinkList.\r
\r
  @retval EFI_SUCCESS           The entry has been removed successfully.\r
  @retval Others                Fail to remove the entry.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4DestroyChildEntryInHandleBuffer (\r
  IN LIST_ENTRY  *Entry,\r
  IN VOID        *Context\r
  )\r
{\r
  MTFTP4_PROTOCOL               *Instance;\r
  EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;\r
  UINTN                         NumberOfChildren;\r
  EFI_HANDLE                    *ChildHandleBuffer;\r
\r
  if ((Entry == NULL) || (Context == NULL)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  Instance          = NET_LIST_USER_STRUCT_S (Entry, MTFTP4_PROTOCOL, Link, MTFTP4_PROTOCOL_SIGNATURE);\r
  ServiceBinding    = ((MTFTP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->ServiceBinding;\r
  NumberOfChildren  = ((MTFTP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->NumberOfChildren;\r
  ChildHandleBuffer = ((MTFTP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *)Context)->ChildHandleBuffer;\r
\r
  if (!NetIsInHandleBuffer (Instance->Handle, NumberOfChildren, ChildHandleBuffer)) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  return ServiceBinding->DestroyChild (ServiceBinding, Instance->Handle);\r
}\r
\r
/**\r
  Stop the MTFTP driver on controller. The controller is a UDP\r
  child handle.\r
\r
  @param  This                   The MTFTP driver binding protocol\r
  @param  Controller             The controller to stop\r
  @param  NumberOfChildren       The number of children\r
  @param  ChildHandleBuffer      The array of the child handle.\r
\r
  @retval EFI_SUCCESS            The driver is stopped on the controller.\r
  @retval EFI_DEVICE_ERROR       Failed to stop the driver on the controller.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4DriverBindingStop (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   Controller,\r
  IN UINTN                        NumberOfChildren,\r
  IN EFI_HANDLE                   *ChildHandleBuffer\r
  )\r
{\r
  EFI_SERVICE_BINDING_PROTOCOL                *ServiceBinding;\r
  MTFTP4_SERVICE                              *MtftpSb;\r
  EFI_HANDLE                                  NicHandle;\r
  EFI_STATUS                                  Status;\r
  LIST_ENTRY                                  *List;\r
  MTFTP4_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT  Context;\r
\r
  //\r
  // MTFTP driver opens UDP child, So, Controller is a UDP\r
  // child handle. Locate the Nic handle first. Then get the\r
  // MTFTP private data back.\r
  //\r
  NicHandle = NetLibGetNicHandle (Controller, &gEfiUdp4ProtocolGuid);\r
\r
  if (NicHandle == NULL) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  Status = gBS->OpenProtocol (\r
                  NicHandle,\r
                  &gEfiMtftp4ServiceBindingProtocolGuid,\r
                  (VOID **)&ServiceBinding,\r
                  This->DriverBindingHandle,\r
                  NicHandle,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  MtftpSb = MTFTP4_SERVICE_FROM_THIS (ServiceBinding);\r
\r
  if (!IsListEmpty (&MtftpSb->Children)) {\r
    //\r
    // Destroy the Mtftp4 child instance in ChildHandleBuffer.\r
    //\r
    List                      = &MtftpSb->Children;\r
    Context.ServiceBinding    = ServiceBinding;\r
    Context.NumberOfChildren  = NumberOfChildren;\r
    Context.ChildHandleBuffer = ChildHandleBuffer;\r
    Status                    = NetDestroyLinkList (\r
                                  List,\r
                                  Mtftp4DestroyChildEntryInHandleBuffer,\r
                                  &Context,\r
                                  NULL\r
                                  );\r
  }\r
\r
  if ((NumberOfChildren == 0) && IsListEmpty (&MtftpSb->Children)) {\r
    gBS->UninstallProtocolInterface (\r
           NicHandle,\r
           &gEfiMtftp4ServiceBindingProtocolGuid,\r
           ServiceBinding\r
           );\r
\r
    Mtftp4CleanService (MtftpSb);\r
    if (gMtftp4ControllerNameTable != NULL) {\r
      FreeUnicodeStringTable (gMtftp4ControllerNameTable);\r
      gMtftp4ControllerNameTable = NULL;\r
    }\r
\r
    FreePool (MtftpSb);\r
\r
    Status = EFI_SUCCESS;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Initialize a MTFTP protocol instance which is the child of MtftpSb.\r
\r
  @param  MtftpSb                The MTFTP service binding protocol.\r
  @param  Instance               The MTFTP instance to initialize.\r
\r
**/\r
VOID\r
Mtftp4InitProtocol (\r
  IN     MTFTP4_SERVICE  *MtftpSb,\r
  OUT MTFTP4_PROTOCOL    *Instance\r
  )\r
{\r
  ZeroMem (Instance, sizeof (MTFTP4_PROTOCOL));\r
\r
  Instance->Signature = MTFTP4_PROTOCOL_SIGNATURE;\r
  InitializeListHead (&Instance->Link);\r
  CopyMem (&Instance->Mtftp4, &gMtftp4ProtocolTemplate, sizeof (Instance->Mtftp4));\r
  Instance->State   = MTFTP4_STATE_UNCONFIGED;\r
  Instance->Service = MtftpSb;\r
\r
  InitializeListHead (&Instance->Blocks);\r
}\r
\r
/**\r
  Create a MTFTP child for the service binding instance, then\r
  install the MTFTP protocol to the ChildHandle.\r
\r
  @param  This                   The MTFTP service binding instance.\r
  @param  ChildHandle            The Child handle to install the MTFTP protocol.\r
\r
  @retval EFI_INVALID_PARAMETER  The parameter is invalid.\r
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resource for the new child.\r
  @retval EFI_SUCCESS            The child is successfully create.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4ServiceBindingCreateChild (\r
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                    *ChildHandle\r
  )\r
{\r
  MTFTP4_SERVICE   *MtftpSb;\r
  MTFTP4_PROTOCOL  *Instance;\r
  EFI_STATUS       Status;\r
  EFI_TPL          OldTpl;\r
  VOID             *Udp4;\r
\r
  if ((This == NULL) || (ChildHandle == NULL)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  Instance = AllocatePool (sizeof (*Instance));\r
\r
  if (Instance == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  MtftpSb = MTFTP4_SERVICE_FROM_THIS (This);\r
\r
  Mtftp4InitProtocol (MtftpSb, Instance);\r
\r
  Instance->UnicastPort = UdpIoCreateIo (\r
                            MtftpSb->Controller,\r
                            MtftpSb->Image,\r
                            Mtftp4ConfigNullUdp,\r
                            UDP_IO_UDP4_VERSION,\r
                            Instance\r
                            );\r
\r
  if (Instance->UnicastPort == NULL) {\r
    FreePool (Instance);\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  //\r
  // Install the MTFTP protocol onto ChildHandle\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  ChildHandle,\r
                  &gEfiMtftp4ProtocolGuid,\r
                  &Instance->Mtftp4,\r
                  NULL\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    UdpIoFreeIo (Instance->UnicastPort);\r
    FreePool (Instance);\r
    return Status;\r
  }\r
\r
  Instance->Handle = *ChildHandle;\r
\r
  //\r
  // Open the Udp4 protocol BY_CHILD.\r
  //\r
  Status = gBS->OpenProtocol (\r
                  MtftpSb->ConnectUdp->UdpHandle,\r
                  &gEfiUdp4ProtocolGuid,\r
                  (VOID **)&Udp4,\r
                  gMtftp4DriverBinding.DriverBindingHandle,\r
                  Instance->Handle,\r
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Open the Udp4 protocol by child.\r
  //\r
  Status = gBS->OpenProtocol (\r
                  Instance->UnicastPort->UdpHandle,\r
                  &gEfiUdp4ProtocolGuid,\r
                  (VOID **)&Udp4,\r
                  gMtftp4DriverBinding.DriverBindingHandle,\r
                  Instance->Handle,\r
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    //\r
    // Close the Udp4 protocol.\r
    //\r
    gBS->CloseProtocol (\r
           MtftpSb->ConnectUdp->UdpHandle,\r
           &gEfiUdp4ProtocolGuid,\r
           gMtftp4DriverBinding.DriverBindingHandle,\r
           *ChildHandle\r
           );\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Add it to the parent's child list.\r
  //\r
  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r
\r
  InsertTailList (&MtftpSb->Children, &Instance->Link);\r
  MtftpSb->ChildrenNum++;\r
\r
  gBS->RestoreTPL (OldTpl);\r
\r
  return EFI_SUCCESS;\r
\r
ON_ERROR:\r
  if (Instance->Handle != NULL) {\r
    gBS->UninstallMultipleProtocolInterfaces (\r
           Instance->Handle,\r
           &gEfiMtftp4ProtocolGuid,\r
           &Instance->Mtftp4,\r
           NULL\r
           );\r
  }\r
\r
  UdpIoFreeIo (Instance->UnicastPort);\r
  FreePool (Instance);\r
\r
  return Status;\r
}\r
\r
/**\r
  Destroy one of the service binding's child.\r
\r
  @param  This                   The service binding instance\r
  @param  ChildHandle            The child handle to destroy\r
\r
  @retval EFI_INVALID_PARAMETER  The parameter is invalid.\r
  @retval EFI_UNSUPPORTED        The child may have already been destroyed.\r
  @retval EFI_SUCCESS            The child is destroyed and removed from the\r
                                 parent's child list.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Mtftp4ServiceBindingDestroyChild (\r
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                    ChildHandle\r
  )\r
{\r
  MTFTP4_SERVICE       *MtftpSb;\r
  MTFTP4_PROTOCOL      *Instance;\r
  EFI_MTFTP4_PROTOCOL  *Mtftp4;\r
  EFI_STATUS           Status;\r
  EFI_TPL              OldTpl;\r
\r
  if ((This == NULL) || (ChildHandle == NULL)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Retrieve the private context data structures\r
  //\r
  Status = gBS->OpenProtocol (\r
                  ChildHandle,\r
                  &gEfiMtftp4ProtocolGuid,\r
                  (VOID **)&Mtftp4,\r
                  gMtftp4DriverBinding.DriverBindingHandle,\r
                  ChildHandle,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  Instance = MTFTP4_PROTOCOL_FROM_THIS (Mtftp4);\r
  MtftpSb  = MTFTP4_SERVICE_FROM_THIS (This);\r
\r
  if (Instance->Service != MtftpSb) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (Instance->InDestroy) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  Instance->InDestroy = TRUE;\r
\r
  //\r
  // Close the Udp4 protocol.\r
  //\r
  gBS->CloseProtocol (\r
         MtftpSb->ConnectUdp->UdpHandle,\r
         &gEfiUdp4ProtocolGuid,\r
         gMtftp4DriverBinding.DriverBindingHandle,\r
         ChildHandle\r
         );\r
\r
  gBS->CloseProtocol (\r
         Instance->UnicastPort->UdpHandle,\r
         &gEfiUdp4ProtocolGuid,\r
         gMtftp4DriverBinding.DriverBindingHandle,\r
         ChildHandle\r
         );\r
\r
  if (Instance->McastUdpPort != NULL) {\r
    gBS->CloseProtocol (\r
           Instance->McastUdpPort->UdpHandle,\r
           &gEfiUdp4ProtocolGuid,\r
           gMtftp4DriverBinding.DriverBindingHandle,\r
           ChildHandle\r
           );\r
  }\r
\r
  //\r
  // Uninstall the MTFTP4 protocol first to enable a top down destruction.\r
  //\r
  Status = gBS->UninstallProtocolInterface (\r
                  ChildHandle,\r
                  &gEfiMtftp4ProtocolGuid,\r
                  Mtftp4\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    Instance->InDestroy = FALSE;\r
    return Status;\r
  }\r
\r
  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r
\r
  Mtftp4CleanOperation (Instance, EFI_DEVICE_ERROR);\r
  UdpIoFreeIo (Instance->UnicastPort);\r
\r
  RemoveEntryList (&Instance->Link);\r
  MtftpSb->ChildrenNum--;\r
\r
  gBS->RestoreTPL (OldTpl);\r
\r
  FreePool (Instance);\r
  return EFI_SUCCESS;\r
}\r