[mirror_edk2.git] / NetworkPkg / HttpBootDxe / HttpBootConfig.c

/** @file\r
  Helper functions for configuring or getting the parameters relating to HTTP Boot.\r
\r
Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\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 "HttpBootDxe.h"\r
#include <Library/UefiBootManagerLib.h>\r
\r
CHAR16  mHttpBootConfigStorageName[]     = L"HTTP_BOOT_CONFIG_IFR_NVDATA";\r
\r
/**\r
  Add new boot option for HTTP boot.\r
\r
  @param[in]  Private             Pointer to the driver private data.\r
  @param[in]  UsingIpv6           Set to TRUE if creating boot option for IPv6.\r
  @param[in]  Description         The description text of the boot option.\r
  @param[in]  Uri                 The URI string of the boot file.\r
  \r
  @retval EFI_SUCCESS             The boot option is created successfully.\r
  @retval Others                  Failed to create new boot option.\r
\r
**/\r
EFI_STATUS\r
HttpBootAddBootOption (\r
  IN   HTTP_BOOT_PRIVATE_DATA   *Private,\r
  IN   BOOLEAN                  UsingIpv6,\r
  IN   CHAR16                   *Description,\r
  IN   CHAR16                   *Uri\r
  )\r
{\r
  EFI_DEV_PATH                      *Node;\r
  EFI_DEVICE_PATH_PROTOCOL          *TmpDevicePath;\r
  EFI_DEVICE_PATH_PROTOCOL          *NewDevicePath;\r
  UINTN                             Length;\r
  CHAR8                             AsciiUri[URI_STR_MAX_SIZE];\r
  EFI_STATUS                        Status;\r
  UINTN                             Index;\r
  EFI_BOOT_MANAGER_LOAD_OPTION      NewOption;\r
\r
  NewDevicePath = NULL;\r
  Node          = NULL;\r
  TmpDevicePath = NULL;\r
\r
  if (StrLen (Description) == 0) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Convert the scheme to all lower case.\r
  //\r
  for (Index = 0; Index < StrLen (Uri); Index++) {\r
    if (Uri[Index] == L':') {\r
      break;\r
    }\r
    if (Uri[Index] >= L'A' && Uri[Index] <= L'Z') {\r
      Uri[Index] -= (CHAR16)(L'A' - L'a');\r
    }\r
  }\r
\r
  //\r
  // Only accept empty URI, or http and https URI.\r
  //\r
  if ((StrLen (Uri) != 0) && (StrnCmp (Uri, L"http://", 7) != 0) && (StrnCmp (Uri, L"https://", 8) != 0)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
  \r
  //\r
  // Create a new device path by appending the IP node and URI node to\r
  // the driver's parent device path\r
  //\r
  if (!UsingIpv6) {\r
    Node = AllocateZeroPool (sizeof (IPv4_DEVICE_PATH));\r
    if (Node == NULL) {\r
      Status = EFI_OUT_OF_RESOURCES;\r
      goto ON_EXIT;\r
    }\r
    Node->Ipv4.Header.Type    = MESSAGING_DEVICE_PATH;\r
    Node->Ipv4.Header.SubType = MSG_IPv4_DP;\r
    SetDevicePathNodeLength (Node, sizeof (IPv4_DEVICE_PATH));\r
  } else {\r
    Node = AllocateZeroPool (sizeof (IPv6_DEVICE_PATH));\r
    if (Node == NULL) {\r
      Status = EFI_OUT_OF_RESOURCES;\r
      goto ON_EXIT;\r
    }\r
    Node->Ipv6.Header.Type     = MESSAGING_DEVICE_PATH;\r
    Node->Ipv6.Header.SubType  = MSG_IPv6_DP;\r
    SetDevicePathNodeLength (Node, sizeof (IPv6_DEVICE_PATH));\r
  }\r
  TmpDevicePath = AppendDevicePathNode (Private->ParentDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);\r
  FreePool (Node);\r
  if (TmpDevicePath == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
  //\r
  // Update the URI node with the input boot file URI.\r
  //\r
  UnicodeStrToAsciiStrS (Uri, AsciiUri, sizeof (AsciiUri));\r
  Length = sizeof (EFI_DEVICE_PATH_PROTOCOL) + AsciiStrSize (AsciiUri);\r
  Node = AllocatePool (Length);\r
  if (Node == NULL) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    FreePool (TmpDevicePath);\r
    goto ON_EXIT;\r
  }\r
  Node->DevPath.Type    = MESSAGING_DEVICE_PATH;\r
  Node->DevPath.SubType = MSG_URI_DP;\r
  SetDevicePathNodeLength (Node, Length);\r
  CopyMem ((UINT8*) Node + sizeof (EFI_DEVICE_PATH_PROTOCOL), AsciiUri, AsciiStrSize (AsciiUri));\r
  NewDevicePath = AppendDevicePathNode (TmpDevicePath, (EFI_DEVICE_PATH_PROTOCOL*) Node);\r
  FreePool (Node);\r
  FreePool (TmpDevicePath);\r
  if (NewDevicePath == NULL) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    goto ON_EXIT;\r
  }\r
\r
  //\r
  // Add a new load option.\r
  //\r
  Status = EfiBootManagerInitializeLoadOption (\r
                 &NewOption,\r
                 LoadOptionNumberUnassigned,\r
                 LoadOptionTypeBoot,\r
                 LOAD_OPTION_ACTIVE,\r
                 Description,\r
                 NewDevicePath,\r
                 NULL,\r
                 0\r
                 );\r
  if (EFI_ERROR (Status)) {\r
    goto ON_EXIT;\r
  }\r
\r
  Status = EfiBootManagerAddLoadOptionVariable (&NewOption, (UINTN) -1);\r
  EfiBootManagerFreeLoadOption (&NewOption);\r
\r
ON_EXIT:\r
\r
  if (NewDevicePath != NULL) {\r
    FreePool (NewDevicePath);\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
   \r
  This function allows the caller to request the current\r
  configuration for one or more named elements. The resulting\r
  string is in <ConfigAltResp> format. Also, any and all alternative\r
  configuration strings shall be appended to the end of the\r
  current configuration string. If they are, they must appear\r
  after the current configuration. They must contain the same\r
  routing (GUID, NAME, PATH) as the current configuration string.\r
  They must have an additional description indicating the type of\r
  alternative configuration the string represents,\r
  "ALTCFG=<StringToken>". That <StringToken> (when\r
  converted from Hex UNICODE to binary) is a reference to a\r
  string in the associated string pack.\r
\r
  @param[in]  This       Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.\r
\r
  @param[in]  Request    A null-terminated Unicode string in\r
                         <ConfigRequest> format. Note that this\r
                         includes the routing information as well as\r
                         the configurable name / value pairs. It is\r
                         invalid for this string to be in\r
                         <MultiConfigRequest> format.\r
\r
  @param[out] Progress   On return, points to a character in the\r
                         Request string. Points to the string's null\r
                         terminator if request was successful. Points\r
                         to the most recent "&" before the first\r
                         failing name / value pair (or the beginning\r
                         of the string if the failure is in the first\r
                         name / value pair) if the request was not successful.                        \r
\r
  @param[out] Results    A null-terminated Unicode string in\r
                         <ConfigAltResp> format which has all values\r
                         filled in for the names in the Request string.\r
                         String to be allocated by the called function.\r
\r
  @retval EFI_SUCCESS             The Results string is filled with the\r
                                  values corresponding to all requested\r
                                  names.\r
\r
  @retval EFI_OUT_OF_RESOURCES    Not enough memory to store the\r
                                  parts of the results that must be\r
                                  stored awaiting possible future\r
                                  protocols.\r
\r
  @retval EFI_INVALID_PARAMETER   For example, passing in a NULL\r
                                  for the Request parameter\r
                                  would result in this type of\r
                                  error. In this case, the\r
                                  Progress parameter would be\r
                                  set to NULL. \r
\r
  @retval EFI_NOT_FOUND           Routing data doesn't match any\r
                                  known driver. Progress set to the\r
                                  first character in the routing header.\r
                                  Note: There is no requirement that the\r
                                  driver validate the routing data. It\r
                                  must skip the <ConfigHdr> in order to\r
                                  process the names.\r
\r
  @retval EFI_INVALID_PARAMETER   Illegal syntax. Progress set\r
                                  to most recent "&" before the\r
                                  error or the beginning of the\r
                                  string.\r
\r
  @retval EFI_INVALID_PARAMETER   Unknown name. Progress points\r
                                  to the & before the name in\r
                                  question.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpBootFormExtractConfig (\r
  IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,\r
  IN  CONST EFI_STRING                       Request,\r
  OUT EFI_STRING                             *Progress,\r
  OUT EFI_STRING                             *Results\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  UINTN                            BufferSize;\r
  HTTP_BOOT_FORM_CALLBACK_INFO     *CallbackInfo;\r
  EFI_STRING                       ConfigRequestHdr;\r
  EFI_STRING                       ConfigRequest;\r
  BOOLEAN                          AllocatedRequest;\r
  UINTN                            Size;\r
\r
  if (Progress == NULL || Results == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  *Progress = Request;\r
  if ((Request != NULL) && !HiiIsConfigHdrMatch (Request, &gHttpBootConfigGuid, mHttpBootConfigStorageName)) {\r
    return EFI_NOT_FOUND;\r
  }\r
  \r
  ConfigRequestHdr = NULL;\r
  ConfigRequest    = NULL;\r
  AllocatedRequest = FALSE;\r
  Size             = 0;\r
\r
  CallbackInfo = HTTP_BOOT_FORM_CALLBACK_INFO_FROM_CONFIG_ACCESS (This);\r
  //\r
  // Convert buffer data to <ConfigResp> by helper function BlockToConfig()\r
  //\r
  BufferSize = sizeof (HTTP_BOOT_CONFIG_IFR_NVDATA);\r
  ZeroMem (&CallbackInfo->HttpBootNvData, BufferSize);\r
  StrCpyS (CallbackInfo->HttpBootNvData.Description, DESCRIPTION_STR_MAX_SIZE / sizeof (CHAR16), HTTP_BOOT_DEFAULT_DESCRIPTION_STR);\r
\r
  ConfigRequest = Request;\r
  if ((Request == NULL) || (StrStr (Request, L"OFFSET") == NULL)) {\r
    //\r
    // Request has no request element, construct full request string.\r
    // Allocate and fill a buffer large enough to hold the <ConfigHdr> template\r
    // followed by "&OFFSET=0&WIDTH=WWWWWWWWWWWWWWWW" followed by a Null-terminator\r
    //\r
    ConfigRequestHdr = HiiConstructConfigHdr (&gHttpBootConfigGuid, mHttpBootConfigStorageName, CallbackInfo->ChildHandle);\r
    Size = (StrLen (ConfigRequestHdr) + 32 + 1) * sizeof (CHAR16);\r
    ConfigRequest = AllocateZeroPool (Size);\r
    ASSERT (ConfigRequest != NULL);\r
    AllocatedRequest = TRUE;\r
    UnicodeSPrint (ConfigRequest, Size, L"%s&OFFSET=0&WIDTH=%016LX", ConfigRequestHdr, (UINT64)BufferSize);\r
    FreePool (ConfigRequestHdr);\r
  }\r
\r
  Status = gHiiConfigRouting->BlockToConfig (\r
                                gHiiConfigRouting,\r
                                ConfigRequest,\r
                                (UINT8 *) &CallbackInfo->HttpBootNvData,\r
                                BufferSize,\r
                                Results,\r
                                Progress\r
                                );\r
  \r
  //\r
  // Free the allocated config request string.\r
  //\r
  if (AllocatedRequest) {\r
    FreePool (ConfigRequest);\r
    ConfigRequest = NULL;\r
  }\r
  //\r
  // Set Progress string to the original request string.\r
  //\r
  if (Request == NULL) {\r
    *Progress = NULL;\r
  } else if (StrStr (Request, L"OFFSET") == NULL) {\r
    *Progress = Request + StrLen (Request);\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
   \r
  This function applies changes in a driver's configuration.\r
  Input is a Configuration, which has the routing data for this\r
  driver followed by name / value configuration pairs. The driver\r
  must apply those pairs to its configurable storage. If the\r
  driver's configuration is stored in a linear block of data\r
  and the driver's name / value pairs are in <BlockConfig>\r
  format, it may use the ConfigToBlock helper function (above) to\r
  simplify the job.\r
\r
  @param[in]  This           Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.\r
\r
  @param[in]  Configuration  A null-terminated Unicode string in\r
                             <ConfigString> format. \r
  \r
  @param[out] Progress       A pointer to a string filled in with the\r
                             offset of the most recent '&' before the\r
                             first failing name / value pair (or the\r
                             beginning of the string if the failure\r
                             is in the first name / value pair) or\r
                             the terminating NULL if all was\r
                             successful.\r
\r
  @retval EFI_SUCCESS             The results have been distributed or are\r
                                  awaiting distribution.\r
  \r
  @retval EFI_OUT_OF_RESOURCES    Not enough memory to store the\r
                                  parts of the results that must be\r
                                  stored awaiting possible future\r
                                  protocols.\r
  \r
  @retval EFI_INVALID_PARAMETERS  Passing in a NULL for the\r
                                  Results parameter would result\r
                                  in this type of error.\r
  \r
  @retval EFI_NOT_FOUND           Target for the specified routing data\r
                                  was not found.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpBootFormRouteConfig (\r
  IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,\r
  IN  CONST EFI_STRING                       Configuration,\r
  OUT EFI_STRING                             *Progress\r
  )\r
{\r
  EFI_STATUS                       Status;\r
  UINTN                            BufferSize;\r
  HTTP_BOOT_FORM_CALLBACK_INFO     *CallbackInfo;\r
  HTTP_BOOT_PRIVATE_DATA           *Private;\r
\r
  if (Progress == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
  *Progress = Configuration;\r
\r
  if (Configuration == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  //\r
  // Check routing data in <ConfigHdr>.\r
  // Note: there is no name for Name/Value storage, only GUID will be checked\r
  //\r
  if (!HiiIsConfigHdrMatch (Configuration, &gHttpBootConfigGuid, mHttpBootConfigStorageName)) {\r
    return EFI_NOT_FOUND;\r
  }\r
\r
  CallbackInfo = HTTP_BOOT_FORM_CALLBACK_INFO_FROM_CONFIG_ACCESS (This);\r
  Private      = HTTP_BOOT_PRIVATE_DATA_FROM_CALLBACK_INFO (CallbackInfo);\r
  \r
  BufferSize = sizeof (HTTP_BOOT_CONFIG_IFR_NVDATA);\r
  ZeroMem (&CallbackInfo->HttpBootNvData, BufferSize);\r
\r
  Status = gHiiConfigRouting->ConfigToBlock (\r
                            gHiiConfigRouting,\r
                            Configuration,\r
                            (UINT8 *) &CallbackInfo->HttpBootNvData,\r
                            &BufferSize,\r
                            Progress\r
                            );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Create a new boot option according to the configuration data.\r
  //\r
  HttpBootAddBootOption (\r
    Private,\r
    (CallbackInfo->HttpBootNvData.IpVersion == HTTP_BOOT_IP_VERSION_6) ? TRUE : FALSE,\r
    CallbackInfo->HttpBootNvData.Description,\r
    CallbackInfo->HttpBootNvData.Uri\r
    );\r
  \r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
   \r
  This function is called to provide results data to the driver.\r
  This data consists of a unique key that is used to identify\r
  which data is either being passed back or being asked for.\r
\r
  @param[in]       This          Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.\r
  @param[in]       Action        Specifies the type of action taken by the browser.\r
  @param[in]       QuestionId    A unique value which is sent to the original\r
                                 exporting driver so that it can identify the type\r
                                 of data to expect. The format of the data tends to \r
                                 vary based on the opcode that generated the callback.\r
  @param[in]       Type          The type of value for the question.\r
  @param[in, out]  Value         A pointer to the data being sent to the original\r
                                 exporting driver.\r
  @param[out]      ActionRequest On return, points to the action requested by the\r
                                 callback function.\r
\r
  @retval EFI_SUCCESS            The callback successfully handled the action.\r
  @retval EFI_OUT_OF_RESOURCES   Not enough storage is available to hold the\r
                                 variable and its data.\r
  @retval EFI_DEVICE_ERROR       The variable could not be saved.\r
  @retval EFI_UNSUPPORTED        The specified Action is not supported by the\r
                                 callback.\r
**/\r
EFI_STATUS\r
EFIAPI\r
HttpBootFormCallback (\r
  IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,\r
  IN        EFI_BROWSER_ACTION               Action,\r
  IN        EFI_QUESTION_ID                  QuestionId,\r
  IN        UINT8                            Type,\r
  IN OUT    EFI_IFR_TYPE_VALUE               *Value,\r
  OUT       EFI_BROWSER_ACTION_REQUEST       *ActionRequest\r
  )\r
{\r
  EFI_INPUT_KEY                   Key;\r
  UINTN                           Index;\r
  CHAR16                          *Uri;\r
  HTTP_BOOT_FORM_CALLBACK_INFO    *CallbackInfo;\r
  \r
  if (This == NULL || Value == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  CallbackInfo = HTTP_BOOT_FORM_CALLBACK_INFO_FROM_CONFIG_ACCESS (This);\r
  \r
  if (Action != EFI_BROWSER_ACTION_CHANGING) {\r
    return EFI_UNSUPPORTED;\r
  }\r
  \r
  switch (QuestionId) {\r
  case KEY_INITIATOR_URI:\r
    //\r
    // Get user input URI string\r
    //\r
    Uri = HiiGetString (CallbackInfo->RegisteredHandle, Value->string, NULL);\r
    ASSERT (Uri != NULL);\r
    if (Uri == NULL) {\r
      return EFI_UNSUPPORTED;\r
    }\r
\r
    //\r
    // Convert the scheme to all lower case.\r
    //\r
    for (Index = 0; Index < StrLen (Uri); Index++) {\r
      if (Uri[Index] == L':') {\r
        break;\r
      }\r
      if (Uri[Index] >= L'A' && Uri[Index] <= L'Z') {\r
        Uri[Index] -= (CHAR16)(L'A' - L'a');\r
      }\r
    }\r
\r
    //\r
    // Set the converted URI string back\r
    //\r
    HiiSetString (CallbackInfo->RegisteredHandle, Value->string, Uri, NULL);\r
\r
    //\r
    // The URI should be either an empty string (for corporate environment) ,or http(s) for home environment.\r
    // Pop up a message box for other unsupported URI.\r
    //\r
    if ((StrLen (Uri) != 0) && (StrnCmp (Uri, L"http://", 7) != 0) && (StrnCmp (Uri, L"https://", 8) != 0)) {\r
      CreatePopUp (\r
        EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE,\r
        &Key,\r
        L"ERROR: Unsupported URI!",\r
        L"Only supports HTTP and HTTPS",\r
        NULL\r
        );\r
    }\r
\r
    FreePool (Uri);\r
    break;\r
\r
  default:\r
    break;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Initialize the configuration form.\r
\r
  @param[in]  Private             Pointer to the driver private data.\r
\r
  @retval EFI_SUCCESS             The configuration form is initialized.\r
  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.\r
\r
**/\r
EFI_STATUS\r
HttpBootConfigFormInit (\r
  IN HTTP_BOOT_PRIVATE_DATA     *Private\r
  )\r
{\r
  EFI_STATUS                        Status;\r
  HTTP_BOOT_FORM_CALLBACK_INFO      *CallbackInfo;\r
  VENDOR_DEVICE_PATH                VendorDeviceNode;\r
  CHAR16                            *MacString;\r
  CHAR16                            *OldMenuString;\r
  CHAR16                            MenuString[128];\r
\r
  CallbackInfo = &Private->CallbackInfo;\r
\r
  if (CallbackInfo->Initilized) {\r
    return EFI_SUCCESS;\r
  }\r
  \r
  CallbackInfo->Signature = HTTP_BOOT_FORM_CALLBACK_INFO_SIGNATURE;\r
\r
  //\r
  // Construct device path node for EFI HII Config Access protocol,\r
  // which consists of controller physical device path and one hardware\r
  // vendor guid node.\r
  //\r
  ZeroMem (&VendorDeviceNode, sizeof (VENDOR_DEVICE_PATH));\r
  VendorDeviceNode.Header.Type    = HARDWARE_DEVICE_PATH;\r
  VendorDeviceNode.Header.SubType = HW_VENDOR_DP;\r
  CopyGuid (&VendorDeviceNode.Guid, &gEfiCallerIdGuid);\r
  SetDevicePathNodeLength (&VendorDeviceNode.Header, sizeof (VENDOR_DEVICE_PATH));\r
  CallbackInfo->HiiVendorDevicePath = AppendDevicePathNode (\r
                                        Private->ParentDevicePath,\r
                                        (EFI_DEVICE_PATH_PROTOCOL *) &VendorDeviceNode\r
                                        );\r
  if (CallbackInfo->HiiVendorDevicePath == NULL) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    goto Error;\r
  }\r
\r
  CallbackInfo->ConfigAccess.ExtractConfig = HttpBootFormExtractConfig;\r
  CallbackInfo->ConfigAccess.RouteConfig   = HttpBootFormRouteConfig;\r
  CallbackInfo->ConfigAccess.Callback      = HttpBootFormCallback;\r
  \r
  //\r
  // Install Device Path Protocol and Config Access protocol to driver handle.\r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &CallbackInfo->ChildHandle,\r
                  &gEfiDevicePathProtocolGuid,\r
                  CallbackInfo->HiiVendorDevicePath,\r
                  &gEfiHiiConfigAccessProtocolGuid,\r
                  &CallbackInfo->ConfigAccess,\r
                  NULL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto Error;\r
  }\r
\r
  //\r
  // Publish our HII data.\r
  //\r
  CallbackInfo->RegisteredHandle = HiiAddPackages (\r
                                     &gHttpBootConfigGuid,\r
                                     CallbackInfo->ChildHandle,\r
                                     HttpBootDxeStrings,\r
                                     HttpBootConfigVfrBin,\r
                                     NULL\r
                                     );\r
  if (CallbackInfo->RegisteredHandle == NULL) {\r
    Status = EFI_OUT_OF_RESOURCES;\r
    goto Error;\r
  }\r
\r
  //\r
  // Append MAC string in the menu help string\r
  //\r
  Status = NetLibGetMacString (Private->Controller, NULL, &MacString);\r
  if (!EFI_ERROR (Status)) {\r
    OldMenuString = HiiGetString (\r
                      CallbackInfo->RegisteredHandle, \r
                      STRING_TOKEN (STR_HTTP_BOOT_CONFIG_FORM_HELP), \r
                      NULL\r
                      );\r
    UnicodeSPrint (MenuString, 128, L"%s (MAC:%s)", OldMenuString, MacString);\r
    HiiSetString (\r
      CallbackInfo->RegisteredHandle, \r
      STRING_TOKEN (STR_HTTP_BOOT_CONFIG_FORM_HELP), \r
      MenuString, \r
      NULL\r
      );\r
    \r
    FreePool (MacString);\r
    FreePool (OldMenuString);\r
\r
    CallbackInfo->Initilized = TRUE;\r
    return EFI_SUCCESS;\r
  }\r
  \r
Error:\r
\r
  HttpBootConfigFormUnload (Private);\r
  return Status;\r
}\r
\r
/**\r
  Unload the configuration form, this includes: delete all the configuration\r
  entries, uninstall the form callback protocol, and free the resources used.\r
  The form will only be unload completely when both IP4 and IP6 stack are stopped.\r
\r
  @param[in]  Private             Pointer to the driver private data.\r
\r
  @retval EFI_SUCCESS             The configuration form is unloaded.\r
  @retval Others                  Failed to unload the form.\r
\r
**/\r
EFI_STATUS\r
HttpBootConfigFormUnload (\r
  IN HTTP_BOOT_PRIVATE_DATA     *Private\r
  )\r
{\r
  HTTP_BOOT_FORM_CALLBACK_INFO      *CallbackInfo;\r
\r
  if (Private->Ip4Nic != NULL || Private->Ip6Nic != NULL) {\r
    //\r
    // Only unload the configuration form when both IP4 and IP6 stack are stopped.\r
    //\r
    return EFI_SUCCESS;\r
  }\r
\r
  CallbackInfo = &Private->CallbackInfo;\r
  if (CallbackInfo->ChildHandle != NULL) {\r
    //\r
    // Uninstall EFI_HII_CONFIG_ACCESS_PROTOCOL\r
    //\r
    gBS->UninstallMultipleProtocolInterfaces (\r
           CallbackInfo->ChildHandle,\r
           &gEfiDevicePathProtocolGuid,\r
           CallbackInfo->HiiVendorDevicePath,\r
           &gEfiHiiConfigAccessProtocolGuid,\r
           &CallbackInfo->ConfigAccess,\r
           NULL\r
           );\r
    CallbackInfo->ChildHandle = NULL;\r
  }\r
\r
  if (CallbackInfo->HiiVendorDevicePath != NULL) {\r
    FreePool (CallbackInfo->HiiVendorDevicePath);\r
    CallbackInfo->HiiVendorDevicePath = NULL;\r
  }\r
\r
  if (CallbackInfo->RegisteredHandle != NULL) {\r
    //\r
    // Remove HII package list\r
    //\r
    HiiRemovePackages (CallbackInfo->RegisteredHandle);\r
    CallbackInfo->RegisteredHandle = NULL;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r