[mirror_edk2.git] / NetworkPkg / HttpDxe / HttpDriver.c

/** @file\r
  The driver binding and service binding protocol for HttpDxe driver.\r
\r
  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "HttpDriver.h"\r
\r
///\r
/// Driver Binding Protocol instance\r
///\r
EFI_DRIVER_BINDING_PROTOCOL gHttpDxeDriverBinding = {\r
  HttpDxeDriverBindingSupported,\r
  HttpDxeDriverBindingStart,\r
  HttpDxeDriverBindingStop,\r
  HTTP_DRIVER_VERSION,\r
  NULL,\r
  NULL\r
};\r
\r
/**\r
  Create a HTTP driver service binding private instance.\r
\r
  @param[in]  Controller         The controller that has TCP4 service binding\r
                                 installed.\r
  @param[in]  ImageHandle        The HTTP driver's image handle.\r
  @param[out] ServiceData        Point to HTTP driver private instance.\r
\r
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate some resources.\r
  @retval EFI_SUCCESS            A new HTTP driver private instance is created.\r
\r
**/\r
EFI_STATUS\r
HttpCreateService (\r
  IN  EFI_HANDLE            Controller,\r
  IN  EFI_HANDLE            ImageHandle,\r
  OUT HTTP_SERVICE          **ServiceData\r
  )\r
{\r
  HTTP_SERVICE     *HttpService;\r
\r
  ASSERT (ServiceData != NULL);\r
  *ServiceData = NULL;\r
\r
  HttpService = AllocateZeroPool (sizeof (HTTP_SERVICE));\r
  if (HttpService == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  HttpService->Signature = HTTP_SERVICE_SIGNATURE;\r
  HttpService->ServiceBinding.CreateChild = HttpServiceBindingCreateChild;\r
  HttpService->ServiceBinding.DestroyChild = HttpServiceBindingDestroyChild;\r
  HttpService->ImageHandle = ImageHandle;\r
  HttpService->ControllerHandle = Controller;\r
  HttpService->ChildrenNumber = 0;\r
  InitializeListHead (&HttpService->ChildrenList);\r
  \r
  *ServiceData = HttpService;\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Release all the resource used the HTTP service binding instance.\r
\r
  @param  HttpService        The HTTP private instance.\r
\r
**/\r
VOID\r
HttpCleanService (\r
  IN HTTP_SERVICE     *HttpService\r
  )\r
{\r
  if (HttpService == NULL) {\r
    return ;\r
  }\r
\r
  if (HttpService->TcpChildHandle != NULL) {\r
    gBS->CloseProtocol (\r
           HttpService->TcpChildHandle,\r
           &gEfiTcp4ProtocolGuid,\r
           HttpService->ImageHandle,\r
           HttpService->ControllerHandle\r
           );\r
\r
    NetLibDestroyServiceChild (\r
      HttpService->ControllerHandle,\r
      HttpService->ImageHandle,\r
      &gEfiTcp4ServiceBindingProtocolGuid,\r
      HttpService->TcpChildHandle\r
      );\r
  }\r
}\r
\r
/**\r
  This is the declaration of an EFI image entry point. This entry point is\r
  the same for UEFI Applications, UEFI OS Loaders, and UEFI Drivers including\r
  both device drivers and bus drivers.\r
\r
  @param  ImageHandle           The firmware allocated handle for the UEFI image.\r
  @param  SystemTable           A pointer to the EFI System Table.\r
\r
  @retval EFI_SUCCESS           The operation completed successfully.\r
  @retval Others                An unexpected error occurred.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpDxeDriverEntryPoint (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  //\r
  // Install UEFI Driver Model protocol(s).\r
  //\r
  return EfiLibInstallDriverBindingComponentName2 (\r
           ImageHandle,\r
           SystemTable,\r
           &gHttpDxeDriverBinding,\r
           ImageHandle,\r
           &gHttpDxeComponentName,\r
           &gHttpDxeComponentName2\r
           );\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_INVALID_PARAMETER Any input parameter is NULL.\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
HttpDestroyChildEntryInHandleBuffer (\r
  IN LIST_ENTRY         *Entry,\r
  IN VOID               *Context\r
  )\r
{\r
  HTTP_PROTOCOL                 *HttpInstance;\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
  HttpInstance = NET_LIST_USER_STRUCT_S (Entry, HTTP_PROTOCOL, Link, HTTP_PROTOCOL_SIGNATURE);\r
  ServiceBinding    = ((HTTP_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *) Context)->ServiceBinding;\r
  NumberOfChildren  = ((HTTP_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *) Context)->NumberOfChildren;\r
  ChildHandleBuffer = ((HTTP_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT *) Context)->ChildHandleBuffer;\r
\r
  if (!NetIsInHandleBuffer (HttpInstance->Handle, NumberOfChildren, ChildHandleBuffer)) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  return ServiceBinding->DestroyChild (ServiceBinding, HttpInstance->Handle);\r
}\r
\r
/**\r
  Tests to see if this driver supports a given controller. If a child device is provided, \r
  it further tests to see if this driver supports creating a handle for the specified child device.\r
\r
  This function checks to see if the driver specified by This supports the device specified by \r
  ControllerHandle. Drivers will typically use the device path attached to \r
  ControllerHandle and/or the services from the bus I/O abstraction attached to \r
  ControllerHandle to determine if the driver supports ControllerHandle. This function \r
  may be called many times during platform initialization. In order to reduce boot times, the tests \r
  performed by this function must be very small, and take as little time as possible to execute. This \r
  function must not change the state of any hardware devices, and this function must be aware that the \r
  device specified by ControllerHandle may already be managed by the same driver or a \r
  different driver. This function must match its calls to AllocatePages() with FreePages(), \r
  AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().  \r
  Because ControllerHandle may have been previously started by the same driver, if a protocol is \r
  already in the opened state, then it must not be closed with CloseProtocol(). This is required \r
  to guarantee the state of ControllerHandle is not modified by this function.\r
\r
  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in]  ControllerHandle     The handle of the controller to test. This handle \r
                                   must support a protocol interface that supplies \r
                                   an I/O abstraction to the driver.\r
  @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This \r
                                   parameter is ignored by device drivers, and is optional for bus \r
                                   drivers. For bus drivers, if this parameter is not NULL, then \r
                                   the bus driver must determine if the bus controller specified \r
                                   by ControllerHandle and the child controller specified \r
                                   by RemainingDevicePath are both supported by this \r
                                   bus driver.\r
\r
  @retval EFI_SUCCESS              The device specified by ControllerHandle and\r
                                   RemainingDevicePath is supported by the driver specified by This.\r
  @retval EFI_ALREADY_STARTED      The device specified by ControllerHandle and\r
                                   RemainingDevicePath is already being managed by the driver\r
                                   specified by This.\r
  @retval EFI_ACCESS_DENIED        The device specified by ControllerHandle and\r
                                   RemainingDevicePath is already being managed by a different\r
                                   driver or an application that requires exclusive access.\r
                                   Currently not implemented.\r
  @retval EFI_UNSUPPORTED          The device specified by ControllerHandle and\r
                                   RemainingDevicePath is not supported by the driver specified by This.\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpDxeDriverBindingSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   ControllerHandle,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL\r
  )\r
{\r
  EFI_STATUS       Status;\r
\r
  //\r
  // Test for the HttpServiceBinding protocol.\r
  //\r
  Status = gBS->OpenProtocol (\r
                  ControllerHandle,\r
                  &gEfiHttpServiceBindingProtocolGuid,\r
                  NULL,\r
                  This->DriverBindingHandle,\r
                  ControllerHandle,\r
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                  );\r
  if (!EFI_ERROR (Status)) {\r
    return EFI_ALREADY_STARTED;\r
  }\r
\r
  //\r
  // Test for the Tcp4 Protocol\r
  //\r
  return gBS->OpenProtocol (\r
                ControllerHandle,\r
                &gEfiTcp4ServiceBindingProtocolGuid,\r
                NULL,\r
                This->DriverBindingHandle,\r
                ControllerHandle,\r
                EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                );\r
  \r
}\r
\r
/**\r
  Starts a device controller or a bus controller.\r
\r
  The Start() function is designed to be invoked from the EFI boot service ConnectController().\r
  As a result, much of the error checking on the parameters to Start() has been moved into this \r
  common boot service. It is legal to call Start() from other locations, \r
  but the following calling restrictions must be followed, or the system behavior will not be deterministic.\r
  1. ControllerHandle must be a valid EFI_HANDLE.\r
  2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned\r
     EFI_DEVICE_PATH_PROTOCOL.\r
  3. Prior to calling Start(), the Supported() function for the driver specified by This must\r
     have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.  \r
\r
  @param[in]  This                 A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in]  ControllerHandle     The handle of the controller to start. This handle \r
                                   must support a protocol interface that supplies \r
                                   an I/O abstraction to the driver.\r
  @param[in]  RemainingDevicePath  A pointer to the remaining portion of a device path.  This \r
                                   parameter is ignored by device drivers, and is optional for bus \r
                                   drivers. For a bus driver, if this parameter is NULL, then handles \r
                                   for all the children of Controller are created by this driver.  \r
                                   If this parameter is not NULL and the first Device Path Node is \r
                                   not the End of Device Path Node, then only the handle for the \r
                                   child device specified by the first Device Path Node of \r
                                   RemainingDevicePath is created by this driver.\r
                                   If the first Device Path Node of RemainingDevicePath is \r
                                   the End of Device Path Node, no child handle is created by this\r
                                   driver.\r
\r
  @retval EFI_SUCCESS              The device was started.\r
  @retval EFI_ALREADY_STARTED      This device is already running on ControllerHandle.\r
  @retval EFI_DEVICE_ERROR         The device could not be started due to a device error.Currently not implemented.\r
  @retval EFI_OUT_OF_RESOURCES     The request could not be completed due to a lack of resources.\r
  @retval Others                   The driver failded to start the device.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpDxeDriverBindingStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   ControllerHandle,\r
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL\r
  )\r
{\r
  EFI_STATUS                      Status;\r
  HTTP_SERVICE                    *HttpService;\r
  VOID                            *Interface;\r
  \r
  //\r
  // Test for the Http service binding protocol\r
  //\r
  Status = gBS->OpenProtocol (\r
                  ControllerHandle,\r
                  &gEfiHttpServiceBindingProtocolGuid,\r
                  NULL,\r
                  This->DriverBindingHandle,\r
                  ControllerHandle,\r
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                  );\r
\r
  if (Status == EFI_SUCCESS) {\r
    return EFI_ALREADY_STARTED;\r
  }\r
\r
  Status = HttpCreateService (ControllerHandle, This->DriverBindingHandle, &HttpService);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  ASSERT (HttpService != NULL);\r
\r
  //\r
  // Create a TCP child instance, but do not configure it. This will establish the parent-child relationship.\r
  //\r
  Status = NetLibCreateServiceChild (\r
             ControllerHandle,\r
             This->DriverBindingHandle,\r
             &gEfiTcp4ServiceBindingProtocolGuid,\r
             &HttpService->TcpChildHandle\r
             );\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  Status = gBS->OpenProtocol (\r
                  HttpService->TcpChildHandle,\r
                  &gEfiTcp4ProtocolGuid,\r
                  &Interface,\r
                  This->DriverBindingHandle,\r
                  ControllerHandle,\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER\r
                  );\r
                  \r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Install the HttpServiceBinding Protocol onto Controller\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &ControllerHandle,\r
                  &gEfiHttpServiceBindingProtocolGuid,\r
                  &HttpService->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
\r
  if (HttpService != NULL) {\r
    HttpCleanService (HttpService);\r
    FreePool (HttpService);\r
  }\r
  \r
  return Status;\r
}\r
\r
/**\r
  Stops a device controller or a bus controller.\r
  \r
  The Stop() function is designed to be invoked from the EFI boot service DisconnectController(). \r
  As a result, much of the error checking on the parameters to Stop() has been moved \r
  into this common boot service. It is legal to call Stop() from other locations, \r
  but the following calling restrictions must be followed, or the system behavior will not be deterministic.\r
  1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this\r
     same driver's Start() function.\r
  2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid\r
     EFI_HANDLE. In addition, all of these handles must have been created in this driver's\r
     Start() function, and the Start() function must have called OpenProtocol() on\r
     ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.\r
  \r
  @param[in]  This              A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
  @param[in]  ControllerHandle  A handle to the device being stopped. The handle must \r
                                support a bus specific I/O protocol for the driver \r
                                to use to stop the device.\r
  @param[in]  NumberOfChildren  The number of child device handles in ChildHandleBuffer.\r
  @param[in]  ChildHandleBuffer An array of child handles to be freed. May be NULL \r
                                if NumberOfChildren is 0.\r
\r
  @retval EFI_SUCCESS           The device was stopped.\r
  @retval EFI_DEVICE_ERROR      The device could not be stopped due to a device error.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpDxeDriverBindingStop (\r
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                   ControllerHandle,\r
  IN UINTN                        NumberOfChildren,\r
  IN EFI_HANDLE                   *ChildHandleBuffer OPTIONAL\r
  )\r
{\r
  EFI_HANDLE                                 NicHandle;\r
  EFI_STATUS                                 Status;\r
  EFI_SERVICE_BINDING_PROTOCOL               *ServiceBinding;\r
  HTTP_SERVICE                               *HttpService;\r
  LIST_ENTRY                                 *List;\r
  HTTP_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT   Context;\r
  \r
  //\r
  // HTTP driver opens TCP child, So, Controller is a TCP\r
  // child handle. Locate the Nic handle first. Then get the\r
  // HTTP private data back.\r
  //\r
  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiTcp4ProtocolGuid);\r
  if (NicHandle == NULL) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  Status = gBS->OpenProtocol (\r
                  NicHandle,\r
                  &gEfiHttpServiceBindingProtocolGuid,\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
  HttpService = HTTP_SERVICE_FROM_PROTOCOL (ServiceBinding);\r
\r
  if (!IsListEmpty (&HttpService->ChildrenList)) {\r
    //\r
    // Destroy the HTTP child instance in ChildHandleBuffer.\r
    //\r
    List = &HttpService->ChildrenList;\r
    Context.ServiceBinding    = ServiceBinding;\r
    Context.NumberOfChildren  = NumberOfChildren;\r
    Context.ChildHandleBuffer = ChildHandleBuffer;\r
    Status = NetDestroyLinkList (\r
               List,\r
               HttpDestroyChildEntryInHandleBuffer,\r
               &Context,\r
               NULL\r
               );\r
  }\r
\r
  if (NumberOfChildren == 0 && IsListEmpty (&HttpService->ChildrenList)) {\r
    gBS->UninstallProtocolInterface (\r
           NicHandle,\r
           &gEfiHttpServiceBindingProtocolGuid,\r
           ServiceBinding\r
           );\r
\r
    HttpCleanService (HttpService);\r
   \r
    FreePool (HttpService);\r
\r
    Status = EFI_SUCCESS;\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Creates a child handle and installs a protocol.\r
\r
  The CreateChild() function installs a protocol on ChildHandle.\r
  If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle.\r
  If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.\r
\r
  @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.\r
  @param  ChildHandle Pointer to the handle of the child to create. If it is NULL,\r
                      then a new handle is created. If it is a pointer to an existing UEFI handle,\r
                      then the protocol is added to the existing UEFI handle.\r
\r
  @retval EFI_SUCCES            The protocol was added to ChildHandle.\r
  @retval EFI_INVALID_PARAMETER This is NULL, or ChildHandle is NULL.\r
  @retval EFI_OUT_OF_RESOURCES  There are not enough resources availabe to create\r
                                the child.\r
  @retval other                 The child handle was not created.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpServiceBindingCreateChild (\r
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,\r
  IN OUT EFI_HANDLE                *ChildHandle\r
  )\r
{\r
  HTTP_SERVICE         *HttpService;\r
  HTTP_PROTOCOL        *HttpInstance;\r
  EFI_STATUS           Status;\r
  VOID                 *Interface;\r
  EFI_TPL              OldTpl;\r
\r
  if ((This == NULL) || (ChildHandle == NULL)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  HttpService  = HTTP_SERVICE_FROM_PROTOCOL (This);\r
  HttpInstance = AllocateZeroPool (sizeof (HTTP_PROTOCOL));\r
  if (HttpInstance == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  //\r
  // Install HTTP protocol onto ChildHandle\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  ChildHandle,\r
                  &gEfiHttpProtocolGuid,\r
                  &HttpInstance->Http,\r
                  NULL\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  HttpInstance->Handle = *ChildHandle;\r
\r
  Status = HttpInitProtocol (HttpService, HttpInstance);\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Open the default Tcp4 protocol by child.\r
  //\r
  Status = gBS->OpenProtocol (\r
                  HttpService->TcpChildHandle,\r
                  &gEfiTcp4ProtocolGuid,\r
                  (VOID **) &Interface,\r
                  gHttpDxeDriverBinding.DriverBindingHandle,\r
                  HttpInstance->Handle,\r
                  EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Add it to the HTTP service's child list.\r
  //\r
  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r
\r
  InsertTailList (&HttpService->ChildrenList, &HttpInstance->Link);\r
  HttpService->ChildrenNumber++;\r
\r
  gBS->RestoreTPL (OldTpl);\r
\r
  return EFI_SUCCESS;\r
  \r
ON_ERROR:\r
\r
  HttpCleanProtocol (HttpInstance);\r
  FreePool (HttpInstance);\r
\r
  return Status;\r
}\r
\r
/**\r
  Destroys a child handle with a protocol installed on it.\r
\r
  The DestroyChild() function does the opposite of CreateChild(). It removes a protocol\r
  that was installed by CreateChild() from ChildHandle. If the removed protocol is the\r
  last protocol on ChildHandle, then ChildHandle is destroyed.\r
\r
  @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.\r
  @param  ChildHandle Handle of the child to destroy\r
\r
  @retval EFI_SUCCES            The protocol was removed from ChildHandle.\r
  @retval EFI_UNSUPPORTED       ChildHandle does not support the protocol that is being removed.\r
  @retval EFI_INVALID_PARAMETER Child handle is NULL.\r
  @retval other                 The child handle was not destroyed\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpServiceBindingDestroyChild (\r
  IN EFI_SERVICE_BINDING_PROTOCOL  *This,\r
  IN EFI_HANDLE                    ChildHandle\r
  )\r
{\r
  HTTP_SERVICE             *HttpService;\r
  HTTP_PROTOCOL            *HttpInstance;\r
  EFI_HTTP_PROTOCOL        *Http;\r
  EFI_STATUS                Status;\r
  EFI_TPL                   OldTpl;\r
  \r
  if ((This == NULL) || (ChildHandle == NULL)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  HttpService = HTTP_SERVICE_FROM_PROTOCOL (This);\r
  Status = gBS->OpenProtocol (\r
                  ChildHandle,\r
                  &gEfiHttpProtocolGuid,\r
                  (VOID **) &Http,\r
                  gHttpDxeDriverBinding.DriverBindingHandle,\r
                  ChildHandle,\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_UNSUPPORTED;\r
  }\r
  \r
  HttpInstance = HTTP_INSTANCE_FROM_PROTOCOL (Http);\r
  if (HttpInstance->Service != HttpService) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  if (HttpInstance->InDestroy) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  //\r
  // Close the Tcp4 protocol.\r
  //\r
  gBS->CloseProtocol (\r
         HttpService->TcpChildHandle,\r
         &gEfiTcp4ProtocolGuid,\r
         gHttpDxeDriverBinding.DriverBindingHandle,\r
         ChildHandle\r
         );\r
  \r
  HttpInstance->InDestroy = TRUE;\r
\r
  //\r
  // Uninstall the HTTP protocol.\r
  //\r
  Status = gBS->UninstallProtocolInterface (\r
                  ChildHandle,\r
                  &gEfiHttpProtocolGuid,\r
                  Http\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    HttpInstance->InDestroy = FALSE;\r
    return Status;\r
  }\r
\r
  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);\r
\r
  HttpCleanProtocol (HttpInstance);\r
\r
  RemoveEntryList (&HttpInstance->Link);\r
  HttpService->ChildrenNumber--;\r
\r
  gBS->RestoreTPL (OldTpl);\r
  \r
  FreePool (HttpInstance);\r
  return EFI_SUCCESS;\r
}\r