Revision: 17853
          http://sourceforge.net/p/edk2/code/17853
Author:   jiaxinwu
Date:     2015-07-07 08:19:55 +0000 (Tue, 07 Jul 2015)
Log Message:
-----------
MdeModulePkg: Update Ip4Dxe driver to support Ip4Config2 protocol, 

and also add new UI configuration support in Ip4Dxe driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: jiaxinwu <[email protected]>
Reviewed-by: Ye Ting <[email protected]>

Modified Paths:
--------------
    trunk/edk2/MdeModulePkg/MdeModulePkg.dec
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Driver.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Dxe.inf
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Icmp.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Icmp.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4If.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Igmp.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Igmp.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Impl.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Output.c

Added Paths:
-----------
    trunk/edk2/MdeModulePkg/Include/Guid/Ip4Config2Hii.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2.vfr
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Nv.c
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Nv.h
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4DxeStrings.uni
    trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4NvData.h

Added: trunk/edk2/MdeModulePkg/Include/Guid/Ip4Config2Hii.h
===================================================================
--- trunk/edk2/MdeModulePkg/Include/Guid/Ip4Config2Hii.h                        
        (rev 0)
+++ trunk/edk2/MdeModulePkg/Include/Guid/Ip4Config2Hii.h        2015-07-07 
08:19:55 UTC (rev 17853)
@@ -0,0 +1,25 @@
+/** @file
+  GUIDs used as HII FormSet and HII Package list GUID in Ip4Dxe driver. 
+  
+Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials are licensed and made available 
under 
+the terms and conditions of the BSD License that accompanies this 
distribution.  
+The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php.                                
            
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,          
           
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __IP4_CONFIG2_HII_GUID_H__
+#define __IP4_CONFIG2_HII_GUID_H__
+
+#define IP4_CONFIG2_NVDATA_GUID \
+  { \
+    0x9b942747, 0x154e, 0x4d29, { 0xa4, 0x36, 0xbf, 0x71, 0x0, 0xc8, 0xb5, 
0x3b } \
+  }
+
+extern EFI_GUID gIp4Config2NvDataGuid;
+
+#endif

Modified: trunk/edk2/MdeModulePkg/MdeModulePkg.dec
===================================================================
--- trunk/edk2/MdeModulePkg/MdeModulePkg.dec    2015-07-07 08:17:28 UTC (rev 
17852)
+++ trunk/edk2/MdeModulePkg/MdeModulePkg.dec    2015-07-07 08:19:55 UTC (rev 
17853)
@@ -267,6 +267,9 @@
   ## Include/Guid/Ip4ConfigHii.h
   gNicIp4ConfigNvDataGuid            = { 0x9d5b53f, 0xf4b0, 0x4f59, { 0xa0, 
0xb1, 0x7b, 0x57, 0xd3, 0x5c, 0xe, 0x5 }}
 
+  ## Include/Guid/Ip4Config2Hii.h
+  gIp4Config2NvDataGuid              = { 0x9b942747, 0x154e, 0x4d29, { 0xa4, 
0x36, 0xbf, 0x71, 0x0, 0xc8, 0xb5, 0x3b }}
+
   ## Include/Guid/VlanConfigHii.h
   gVlanConfigFormSetGuid             = { 0xd79df6b0, 0xef44, 0x43bd, { 0x97, 
0x97, 0x43, 0xe9, 0x3b, 0xcf, 0x5f, 0xa8 }}
 

Added: trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2.vfr
===================================================================
--- trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2.vfr             
                (rev 0)
+++ trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2.vfr     
2015-07-07 08:19:55 UTC (rev 17853)
@@ -0,0 +1,100 @@
+/** @file
+  Vfr file for IP4Dxe.
+
+Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD 
License
+which accompanies this distribution.  The full text of the license may be 
found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#include "Ip4NvData.h"
+
+#define EFI_NETWORK_DEVICE_CLASS  0x04
+
+formset
+  guid     = IP4_CONFIG2_NVDATA_GUID,
+  title    = STRING_TOKEN(STR_IP4_CONFIG2_FORM_TITLE),
+  help     = STRING_TOKEN(STR_IP4_CONFIG2_FORM_HELP),
+  class    = EFI_NETWORK_DEVICE_CLASS,
+  subclass = 0x03,
+
+  varstore IP4_CONFIG2_IFR_NVDATA,
+    name = IP4_CONFIG2_IFR_NVDATA,
+    guid = IP4_CONFIG2_NVDATA_GUID;
+
+  form formid = FORMID_MAIN_FORM,
+    title  = STRING_TOKEN(STR_IP4_DEVICE_FORM_TITLE);
+
+    checkbox varid = IP4_CONFIG2_IFR_NVDATA.Configure,
+            prompt = STRING_TOKEN(STR_IP4_CONFIGURE),
+            help   = STRING_TOKEN(STR_IP4_CONFIGURE),
+            flags  = INTERACTIVE,
+            key    = KEY_ENABLE,
+    endcheckbox;
+
+    suppressif ideqval IP4_CONFIG2_IFR_NVDATA.Configure == 0x00;
+
+      checkbox varid = IP4_CONFIG2_IFR_NVDATA.DhcpEnable,
+              prompt = STRING_TOKEN(STR_IP4_ENABLE_DHCP),
+              help   = STRING_TOKEN(STR_IP4_ENABLE_DHCP),
+              flags  = INTERACTIVE,
+              key    = KEY_DHCP_ENABLE,
+      endcheckbox;
+    endif;
+
+    suppressif ideqval IP4_CONFIG2_IFR_NVDATA.DhcpEnable == 0x01 OR ideqval 
IP4_CONFIG2_IFR_NVDATA.Configure == 0x00;
+
+      string  varid   = IP4_CONFIG2_IFR_NVDATA.StationAddress,
+              prompt  = STRING_TOKEN(STR_IP4_LOCAL_IP_ADDRESS),
+              help    = STRING_TOKEN(STR_IP4_IP_ADDRESS_HELP),
+              flags   = INTERACTIVE,
+              key     = KEY_LOCAL_IP,
+              minsize = IP_MIN_SIZE,
+              maxsize = IP_MAX_SIZE,
+      endstring;
+
+      string  varid   = IP4_CONFIG2_IFR_NVDATA.SubnetMask,
+              prompt  = STRING_TOKEN(STR_IP4_LOCAL_MASK),
+              help    = STRING_TOKEN(STR_IP4_MASK_HELP),
+              flags   = INTERACTIVE,
+              key     = KEY_SUBNET_MASK,
+              minsize = IP_MIN_SIZE,
+             maxsize = IP_MAX_SIZE,
+      endstring;
+
+      string  varid   = IP4_CONFIG2_IFR_NVDATA.GatewayAddress,
+              prompt  = STRING_TOKEN(STR_IP4_LOCAL_GATEWAY),
+              help    = STRING_TOKEN(STR_IP4_GATEWAY_HELP),
+              flags   = INTERACTIVE,
+              key     = KEY_GATE_WAY,
+              minsize = IP_MIN_SIZE,
+              maxsize = IP_MAX_SIZE,
+      endstring;
+
+      string  varid   = IP4_CONFIG2_IFR_NVDATA.DnsAddress,
+              prompt  = STRING_TOKEN(STR_IP4_LOCAL_DNS),
+              help    = STRING_TOKEN(STR_IP4_DNS_HELP),
+              flags   = INTERACTIVE,
+              key     = KEY_DNS,
+              minsize = IP_MIN_SIZE,
+              maxsize = ADDRESS_STR_MAX_SIZE,
+      endstring;
+
+    endif;
+
+    subtitle text = STRING_TOKEN(STR_NULL);
+    
+    text
+      help   = STRING_TOKEN(STR_SAVE_CHANGES),
+      text   = STRING_TOKEN(STR_SAVE_CHANGES),
+      flags  = INTERACTIVE,
+      key    = KEY_SAVE_CHANGES;
+      
+  endform;
+
+endformset;
+

Added: trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c
===================================================================
--- trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c           
                (rev 0)
+++ trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c   
2015-07-07 08:19:55 UTC (rev 17853)
@@ -0,0 +1,1969 @@
+/** @file
+  The implementation of EFI IPv4 Configuration II Protocol.
+
+  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD 
License
+  which accompanies this distribution.  The full text of the license may be 
found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "Ip4Impl.h"
+
+LIST_ENTRY  mIp4Config2InstanceList = {&mIp4Config2InstanceList, 
&mIp4Config2InstanceList};
+
+/**
+  The event process routine when the DHCPv4 service binding protocol is 
installed
+  in the system.
+
+  @param[in]     Event         Not used.
+  @param[in]     Context       Pointer to the IP4 config2 instance data.
+
+**/
+VOID
+EFIAPI
+Ip4Config2OnDhcp4SbInstalled (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  );
+
+/**
+  Destroy the Dhcp4 child in IP4_CONFIG2_INSTANCE and release the resources.
+
+  @param[in, out] Instance    The buffer of IP4 config2 instance to be freed.
+
+  @retval EFI_SUCCESS         The child was successfully destroyed.
+  @retval Others              Failed to destroy the child.
+
+**/
+EFI_STATUS
+Ip4Config2DestroyDhcp4 (
+  IN OUT IP4_CONFIG2_INSTANCE  *Instance
+  )
+{
+  IP4_SERVICE                 *IpSb;
+  EFI_STATUS                  Status;
+  EFI_DHCP4_PROTOCOL          *Dhcp4;
+
+  Dhcp4 = Instance->Dhcp4;
+  ASSERT (Dhcp4 != NULL);
+
+  Dhcp4->Stop (Dhcp4);
+  Dhcp4->Configure (Dhcp4, NULL);
+  Instance->Dhcp4 = NULL;
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+
+  //
+  // Close DHCPv4 protocol and destroy the child.
+  //
+  Status = gBS->CloseProtocol (
+                  Instance->Dhcp4Handle,
+                  &gEfiDhcp4ProtocolGuid,
+                  IpSb->Image,
+                  IpSb->Controller
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = NetLibDestroyServiceChild (
+             IpSb->Controller,
+             IpSb->Image,
+             &gEfiDhcp4ServiceBindingProtocolGuid,
+             Instance->Dhcp4Handle
+             );
+
+  Instance->Dhcp4Handle = NULL;
+
+  return Status;  
+}
+
+/**
+  Start the DHCP configuration for this IP service instance.
+  It will locates the EFI_IP4_CONFIG2_PROTOCOL, then start the
+  DHCP configuration.
+
+  @param[in]  Instance           The IP4 config2 instance to configure.
+
+  @retval EFI_SUCCESS            The auto configuration is successfull started.
+  @retval Others                 Failed to start auto configuration.
+
+**/
+EFI_STATUS
+Ip4StartAutoConfig (
+  IN IP4_CONFIG2_INSTANCE   *Instance
+  );
+
+/**
+  Update the current policy to NewPolicy. During the transition
+  period, the default router list
+  and address list in all interfaces will be released.
+
+  @param[in]  IpSb               The IP4 service binding instance.
+  @param[in]  NewPolicy          The new policy to be updated to.
+
+**/
+VOID
+Ip4Config2OnPolicyChanged (
+  IN IP4_SERVICE            *IpSb,
+  IN EFI_IP4_CONFIG2_POLICY NewPolicy
+  )
+{
+  IP4_INTERFACE   *IpIf;
+  IP4_ROUTE_TABLE *RouteTable;
+
+  //
+  // Currently there are only two policies: static and dhcp. Regardless of
+  // what transition is going on, i.e., static -> dhcp and dhcp ->
+  // static, we have to free default router table and all addresses.
+  //
+
+  if (IpSb->DefaultInterface != NULL) {
+    if (IpSb->DefaultRouteTable != NULL) {
+      Ip4FreeRouteTable (IpSb->DefaultRouteTable);
+      IpSb->DefaultRouteTable = NULL;    
+    }
+
+    Ip4CancelReceive (IpSb->DefaultInterface);
+
+    Ip4FreeInterface (IpSb->DefaultInterface, NULL);
+    IpSb->DefaultInterface = NULL;
+  }
+
+  Ip4CleanAssembleTable (&IpSb->Assemble);
+
+  //
+  // Create new default interface and route table.
+  //    
+  IpIf = Ip4CreateInterface (IpSb->Mnp, IpSb->Controller, IpSb->Image);
+  if (IpIf == NULL) {
+    return ;
+  }
+
+  RouteTable = Ip4CreateRouteTable ();
+  if (RouteTable == NULL) {
+    Ip4FreeInterface (IpIf, NULL);
+    return ;
+  }
+  
+  IpSb->DefaultInterface  = IpIf;
+  InsertHeadList (&IpSb->Interfaces, &IpIf->Link);
+  IpSb->DefaultRouteTable = RouteTable;
+  Ip4ReceiveFrame (IpIf, NULL, Ip4AccpetFrame, IpSb);
+
+  if (IpSb->State == IP4_SERVICE_CONFIGED) {
+    IpSb->State = IP4_SERVICE_UNSTARTED;
+  }
+
+  //
+  // Start the dhcp configuration.
+  //
+  if (NewPolicy == Ip4Config2PolicyDhcp) {
+    Ip4StartAutoConfig (&IpSb->Ip4Config2Instance);
+  }
+
+}
+
+/**
+  Signal the registered event. It is the callback routine for NetMapIterate.
+
+  @param[in]  Map    Points to the list of registered event.
+  @param[in]  Item   The registered event.
+  @param[in]  Arg    Not used.
+
+  @retval EFI_SUCCESS           The event was signaled successfully.
+**/
+EFI_STATUS
+EFIAPI
+Ip4Config2SignalEvent (
+  IN NET_MAP                *Map,
+  IN NET_MAP_ITEM           *Item,
+  IN VOID                   *Arg
+  )
+{
+  gBS->SignalEvent ((EFI_EVENT) Item->Key);
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Read the configuration data from variable storage according to the VarName 
and
+  gEfiIp4Config2ProtocolGuid. It checks the integrity of variable data. If the
+  data is corrupted, it clears the variable data to ZERO. Othewise, it outputs 
the
+  configuration data to IP4_CONFIG2_INSTANCE.
+
+  @param[in]      VarName       The pointer to the variable name
+  @param[in, out] Instance      The pointer to the IP4 config2 instance data.
+
+  @retval EFI_NOT_FOUND         The variable can not be found or already 
corrupted.
+  @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the 
operation.
+  @retval EFI_SUCCESS           The configuration data was retrieved 
successfully.
+
+**/
+EFI_STATUS
+Ip4Config2ReadConfigData (
+  IN     CHAR16               *VarName,
+  IN OUT IP4_CONFIG2_INSTANCE *Instance
+  )
+{
+  EFI_STATUS              Status;
+  UINTN                   VarSize;
+  IP4_CONFIG2_VARIABLE    *Variable;
+  IP4_CONFIG2_DATA_ITEM   *DataItem;
+  UINTN                   Index;
+  IP4_CONFIG2_DATA_RECORD DataRecord;
+  CHAR8                   *Data;
+
+  //
+  // Try to read the configuration variable.
+  //
+  VarSize = 0;
+  Status  = gRT->GetVariable (
+                   VarName,
+                   &gEfiIp4Config2ProtocolGuid,
+                   NULL,
+                   &VarSize,
+                   NULL
+                   );
+
+  if (Status == EFI_BUFFER_TOO_SMALL) {
+    //
+    // Allocate buffer and read the config variable.
+    //
+    Variable = AllocatePool (VarSize);
+    if (Variable == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gRT->GetVariable (
+                    VarName,
+                    &gEfiIp4Config2ProtocolGuid,
+                    NULL,
+                    &VarSize,
+                    Variable
+                    );
+    if (EFI_ERROR (Status) || (UINT16) (~NetblockChecksum ((UINT8 *) Variable, 
(UINT32) VarSize)) != 0) {
+      //
+      // GetVariable still error or the variable is corrupted.
+      // Fall back to the default value.
+      //
+      FreePool (Variable);
+
+      //
+      // Remove the problematic variable and return EFI_NOT_FOUND, a new
+      // variable will be set again.
+      //
+      gRT->SetVariable (
+             VarName,
+             &gEfiIp4Config2ProtocolGuid,
+             IP4_CONFIG2_VARIABLE_ATTRIBUTE,
+             0,
+             NULL
+             );
+
+      return EFI_NOT_FOUND;
+    }
+
+ 
+    for (Index = 0; Index < Variable->DataRecordCount; Index++) {
+
+      CopyMem (&DataRecord, &Variable->DataRecord[Index], sizeof (DataRecord));
+
+      DataItem = &Instance->DataItem[DataRecord.DataType];
+      if (DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED) &&
+          (DataItem->DataSize != DataRecord.DataSize)
+          ) {
+        //
+        // Perhaps a corrupted data record...
+        //
+        continue;
+      }
+
+      if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED)) {
+        //
+        // This data item has variable length data.
+        //
+        DataItem->Data.Ptr = AllocatePool (DataRecord.DataSize);
+        if (DataItem->Data.Ptr == NULL) {
+          //
+          // no memory resource
+          //
+          continue;
+        }
+      }
+
+      Data = (CHAR8 *) Variable + DataRecord.Offset;
+      CopyMem (DataItem->Data.Ptr, Data, DataRecord.DataSize);
+
+      DataItem->DataSize = DataRecord.DataSize;
+      DataItem->Status   = EFI_SUCCESS;
+    }
+
+    FreePool (Variable);
+    return EFI_SUCCESS;
+  }
+
+  return Status;
+}
+
+/**
+  Write the configuration data from IP4_CONFIG2_INSTANCE to variable storage.
+
+  @param[in]      VarName       The pointer to the variable name.
+  @param[in]      Instance      The pointer to the IP4 config2 instance data.
+
+  @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the 
operation.
+  @retval EFI_SUCCESS           The configuration data is written successfully.
+
+**/
+EFI_STATUS
+Ip4Config2WriteConfigData (
+  IN CHAR16               *VarName,
+  IN IP4_CONFIG2_INSTANCE *Instance
+  )
+{
+  UINTN                   Index;
+  UINTN                   VarSize;
+  IP4_CONFIG2_DATA_ITEM   *DataItem;
+  IP4_CONFIG2_VARIABLE    *Variable;
+  IP4_CONFIG2_DATA_RECORD *DataRecord;
+  CHAR8                   *Heap;
+  EFI_STATUS              Status;
+
+  VarSize = sizeof (IP4_CONFIG2_VARIABLE) - sizeof (IP4_CONFIG2_DATA_RECORD);
+
+  for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
+
+    DataItem = &Instance->DataItem[Index];
+    if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_VOLATILE) && 
!EFI_ERROR (DataItem->Status)) {
+
+      VarSize += sizeof (IP4_CONFIG2_DATA_RECORD) + DataItem->DataSize;
+    }
+  }
+
+  Variable = AllocatePool (VarSize);
+  if (Variable == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Heap                      = (CHAR8 *) Variable + VarSize;
+  Variable->DataRecordCount = 0;
+
+  for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
+
+    DataItem = &Instance->DataItem[Index];
+    if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_VOLATILE) && 
!EFI_ERROR (DataItem->Status)) {
+
+      Heap -= DataItem->DataSize;
+      CopyMem (Heap, DataItem->Data.Ptr, DataItem->DataSize);
+
+      DataRecord           = &Variable->DataRecord[Variable->DataRecordCount];
+      DataRecord->DataType = (EFI_IP4_CONFIG2_DATA_TYPE) Index;
+      DataRecord->DataSize = (UINT32) DataItem->DataSize;
+      DataRecord->Offset   = (UINT16) (Heap - (CHAR8 *) Variable);
+
+      Variable->DataRecordCount++;
+    }
+  }
+
+  Variable->Checksum = 0;
+  Variable->Checksum = (UINT16) ~NetblockChecksum ((UINT8 *) Variable, 
(UINT32) VarSize);
+
+  Status = gRT->SetVariable (
+                  VarName,
+                  &gEfiIp4Config2ProtocolGuid,
+                  IP4_CONFIG2_VARIABLE_ATTRIBUTE,
+                  VarSize,
+                  Variable
+                  );
+
+  FreePool (Variable);
+
+  return Status;
+}
+
+
+/**
+  Build a EFI_IP4_ROUTE_TABLE to be returned to the caller of GetModeData. 
+  The EFI_IP4_ROUTE_TABLE is clumsy to use in the internal operation of the 
+  IP4 driver.
+
+  @param[in]   IpSb        The IP4 service binding instance.
+  @param[out]  Table       The built IP4 route table.
+
+  @retval EFI_SUCCESS           The route table is successfully build
+  @retval EFI_NOT_FOUND         Failed to allocate the memory for the rotue 
table.
+
+**/
+EFI_STATUS
+Ip4Config2BuildDefaultRouteTable (
+  IN  IP4_SERVICE               *IpSb,
+  OUT EFI_IP4_ROUTE_TABLE       *Table
+  )
+{
+  LIST_ENTRY                *Entry; 
+  IP4_ROUTE_ENTRY           *RtEntry;
+  UINT32                    Count;
+  INT32                     Index;
+
+  if (IpSb->DefaultRouteTable == NULL) {
+    return EFI_NOT_FOUND;
+  }
+
+  Count = IpSb->DefaultRouteTable->TotalNum;
+
+  if (Count == 0) {
+    return EFI_NOT_FOUND;
+  }
+
+  //
+  // Copy the route entry to EFI route table. Keep the order of
+  // route entry copied from most specific to default route. That
+  // is, interlevel the route entry from the instance's route area
+  // and those from the default route table's route area.
+  //
+  Count = 0;
+
+  for (Index = IP4_MASK_NUM - 1; Index >= 0; Index--) {
+
+    NET_LIST_FOR_EACH (Entry, &(IpSb->DefaultRouteTable->RouteArea[Index])) {
+      RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
+
+      EFI_IP4 (Table[Count].SubnetAddress)  = HTONL (RtEntry->Dest & 
RtEntry->Netmask);
+      EFI_IP4 (Table[Count].SubnetMask)     = HTONL (RtEntry->Netmask);
+      EFI_IP4 (Table[Count].GatewayAddress) = HTONL (RtEntry->NextHop);
+
+      Count++;
+    }
+
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  The event process routine when the DHCPv4 service binding protocol is 
installed
+  in the system.
+
+  @param[in]     Event         Not used.
+  @param[in]     Context       The pointer to the IP4 config2 instance data.
+
+**/
+VOID
+EFIAPI
+Ip4Config2OnDhcp4SbInstalled (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  IP4_CONFIG2_INSTANCE  *Instance;
+
+  Instance = (IP4_CONFIG2_INSTANCE *) Context;
+
+  if ((Instance->Dhcp4Handle != NULL) || (Instance->Policy != 
Ip4Config2PolicyDhcp)) {
+    //
+    // The DHCP4 child is already created or the policy is no longer DHCP.
+    //
+    return ;
+  }
+
+  Ip4StartAutoConfig (Instance);
+}
+
+/**
+  Set the station address and subnetmask for the default interface.
+
+  @param[in]  Instance           The pointer to the IP4 config2 instance data.
+  @param[in]  StationAddress     Ip address to be set.
+  @param[in]  SubnetMask         Subnet to be set.
+
+  @retval EFI_SUCCESS   Set default address successful.     
+  @retval Others        Some errors occur in setting.     
+
+**/
+EFI_STATUS
+Ip4Config2SetDefaultAddr (
+  IN IP4_CONFIG2_INSTANCE   *Instance,
+  IN IP4_ADDR               StationAddress,
+  IN IP4_ADDR               SubnetMask
+  )
+{
+  EFI_STATUS                Status;
+  IP4_SERVICE               *IpSb;
+  IP4_INTERFACE             *IpIf;
+  IP4_PROTOCOL              *Ip4Instance;
+  EFI_ARP_PROTOCOL          *Arp;
+  LIST_ENTRY                *Entry;
+  IP4_ADDR                  Subnet;
+  IP4_ROUTE_TABLE           *RouteTable;
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  IpIf = IpSb->DefaultInterface;
+  ASSERT (IpIf != NULL);
+
+  if ((IpIf->Ip == StationAddress) && (IpIf->SubnetMask == SubnetMask)) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // The default address is changed, free the previous interface first.
+  //
+  if (IpSb->DefaultRouteTable != NULL) {
+    Ip4FreeRouteTable (IpSb->DefaultRouteTable);
+    IpSb->DefaultRouteTable = NULL;    
+  }
+
+  Ip4CancelReceive (IpSb->DefaultInterface);
+  Ip4FreeInterface (IpSb->DefaultInterface, NULL);
+  IpSb->DefaultInterface = NULL;
+  //
+  // Create new default interface and route table.
+  //    
+  IpIf = Ip4CreateInterface (IpSb->Mnp, IpSb->Controller, IpSb->Image);
+  if (IpIf == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  RouteTable = Ip4CreateRouteTable ();
+  if (RouteTable == NULL) {
+    Ip4FreeInterface (IpIf, NULL);
+    return EFI_OUT_OF_RESOURCES;
+  }
+  
+  IpSb->DefaultInterface  = IpIf;
+  InsertHeadList (&IpSb->Interfaces, &IpIf->Link);
+  IpSb->DefaultRouteTable = RouteTable;
+  Ip4ReceiveFrame (IpIf, NULL, Ip4AccpetFrame, IpSb);
+
+  if (IpSb->State == IP4_SERVICE_CONFIGED) {
+    IpSb->State = IP4_SERVICE_UNSTARTED;
+  }
+
+  Status = Ip4SetAddress (IpIf, StationAddress, SubnetMask);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (IpIf->Arp != NULL) {
+    //   
+    // A non-NULL IpIf->Arp here means a new ARP child is created when setting 
default address, 
+    // but some IP children may have referenced the default interface before 
it is configured,
+    // these IP instances also consume this ARP protocol so they need to open 
it BY_CHILD_CONTROLLER.
+    //
+    Arp = NULL;
+    NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {
+      Ip4Instance = NET_LIST_USER_STRUCT_S (Entry, IP4_PROTOCOL, AddrLink, 
IP4_PROTOCOL_SIGNATURE);
+      Status = gBS->OpenProtocol (
+                      IpIf->ArpHandle,
+                      &gEfiArpProtocolGuid,
+                      (VOID **) &Arp,
+                      gIp4DriverBinding.DriverBindingHandle,
+                      Ip4Instance->Handle,
+                      EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
+                      );
+      if (EFI_ERROR (Status)) {
+        return Status;
+      }
+    }
+  }
+
+  Ip4AddRoute (
+    IpSb->DefaultRouteTable,
+    StationAddress,
+    SubnetMask,
+    IP4_ALLZERO_ADDRESS
+    );
+
+  //
+  // Add a route for the connected network.
+  //
+  Subnet = StationAddress & SubnetMask;
+
+  Ip4AddRoute (
+    IpSb->DefaultRouteTable,
+    Subnet,
+    SubnetMask,
+    IP4_ALLZERO_ADDRESS
+    );
+
+  IpSb->State = IP4_SERVICE_CONFIGED;
+  return EFI_SUCCESS;
+}
+
+/**
+  Set the station address, subnetmask and gateway address for the default 
interface.
+
+  @param[in]  Instance         The pointer to the IP4 config2 instance data.  
+  @param[in]  StationAddress   Ip address to be set.
+  @param[in]  SubnetMask       Subnet to be set.
+  @param[in]  GatewayAddress   Gateway to be set.
+
+  @retval EFI_SUCCESS     Set default If successful.    
+  @retval Others          Errors occur as indicated.  
+
+**/
+EFI_STATUS
+Ip4Config2SetDefaultIf (
+  IN IP4_CONFIG2_INSTANCE   *Instance,
+  IN IP4_ADDR               StationAddress,
+  IN IP4_ADDR               SubnetMask,
+  IN IP4_ADDR               GatewayAddress
+  )
+{
+  EFI_STATUS                Status;
+  IP4_SERVICE               *IpSb;
+
+  Status = Ip4Config2SetDefaultAddr (Instance, StationAddress, SubnetMask);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Create a route if there is a default router.
+  //
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  if (GatewayAddress != IP4_ALLZERO_ADDRESS) {
+    Ip4AddRoute (
+      IpSb->DefaultRouteTable,
+      IP4_ALLZERO_ADDRESS,
+      IP4_ALLZERO_ADDRESS,
+      GatewayAddress
+      );        
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Release all the DHCP related resources.
+
+  @param  Instance              The IP4 config2 instance.
+
+  @return None
+
+**/
+VOID
+Ip4Config2CleanDhcp4 (
+  IN IP4_CONFIG2_INSTANCE   *Instance
+  )
+{
+  IP4_SERVICE               *IpSb;
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+
+  if (Instance->Dhcp4 != NULL) {
+    Instance->Dhcp4->Stop (Instance->Dhcp4);
+
+    gBS->CloseProtocol (
+          Instance->Dhcp4Handle,
+          &gEfiDhcp4ProtocolGuid,
+          IpSb->Image,
+          IpSb->Controller
+          );
+
+    Instance->Dhcp4 = NULL;
+  }
+
+  if (Instance->Dhcp4Handle != NULL) {
+    NetLibDestroyServiceChild (
+      IpSb->Controller,
+      IpSb->Image,
+      &gEfiDhcp4ServiceBindingProtocolGuid,
+      Instance->Dhcp4Handle
+      );
+
+    Instance->Dhcp4Handle = NULL;
+  }
+
+  if (Instance->Dhcp4Event != NULL) {
+    gBS->CloseEvent (Instance->Dhcp4Event);
+    Instance->Dhcp4Event = NULL;
+  }
+}
+
+
+/**
+  Callback function when DHCP process finished. It will save the
+  retrieved IP configure parameter from DHCP to the NVRam.
+
+  @param  Event                  The callback event
+  @param  Context                Opaque context to the callback
+
+  @return None
+
+**/
+VOID
+EFIAPI
+Ip4Config2OnDhcp4Complete (
+  IN EFI_EVENT              Event,
+  IN VOID                   *Context
+  )
+{
+  IP4_CONFIG2_INSTANCE      *Instance;
+  EFI_DHCP4_MODE_DATA       Dhcp4Mode;
+  EFI_STATUS                Status;
+  IP4_ADDR                  StationAddress;
+  IP4_ADDR                  SubnetMask;
+  IP4_ADDR                  GatewayAddress;
+
+  Instance = (IP4_CONFIG2_INSTANCE *) Context;
+  ASSERT (Instance->Dhcp4 != NULL);
+
+  //
+  // Get the DHCP retrieved parameters
+  //
+  Status = Instance->Dhcp4->GetModeData (Instance->Dhcp4, &Dhcp4Mode);
+
+  if (EFI_ERROR (Status)) {
+    goto Exit;
+  }
+
+  if (Dhcp4Mode.State == Dhcp4Bound) {
+    StationAddress = EFI_NTOHL (Dhcp4Mode.ClientAddress);
+    SubnetMask = EFI_NTOHL (Dhcp4Mode.SubnetMask);
+    GatewayAddress = EFI_NTOHL (Dhcp4Mode.RouterAddress);
+
+    Status = Ip4Config2SetDefaultIf (Instance, StationAddress, SubnetMask, 
GatewayAddress);
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+  
+    Instance->DhcpSuccess = TRUE;
+  }
+
+Exit:
+  Ip4Config2CleanDhcp4 (Instance);
+  DispatchDpc ();
+}
+
+
+/**
+  Start the DHCP configuration for this IP service instance.
+  It will locates the EFI_IP4_CONFIG2_PROTOCOL, then start the
+  DHCP configuration.
+
+  @param[in]  Instance           The IP4 config2 instance to configure
+
+  @retval EFI_SUCCESS            The auto configuration is successfull started
+  @retval Others                 Failed to start auto configuration.
+
+**/
+EFI_STATUS
+Ip4StartAutoConfig (
+  IN IP4_CONFIG2_INSTANCE   *Instance
+  )
+{
+  IP4_SERVICE                    *IpSb;
+  EFI_DHCP4_PROTOCOL             *Dhcp4;
+  EFI_DHCP4_MODE_DATA            Dhcp4Mode;
+  EFI_DHCP4_PACKET_OPTION        *OptionList[1];
+  IP4_CONFIG2_DHCP4_OPTION       ParaList;
+  EFI_STATUS                     Status;
+ 
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+
+  if (IpSb->State > IP4_SERVICE_UNSTARTED) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // A host must not invoke DHCP configuration if it is already
+  // participating in the DHCP configuraiton process.
+  //
+  if (Instance->Dhcp4Handle != NULL) {
+    return EFI_SUCCESS;
+  }
+
+  Status = NetLibCreateServiceChild (
+             IpSb->Controller,
+             IpSb->Image,
+             &gEfiDhcp4ServiceBindingProtocolGuid,
+             &Instance->Dhcp4Handle
+             );
+
+  if (Status == EFI_UNSUPPORTED) {
+    //
+    // No DHCPv4 Service Binding protocol, register a notify.
+    //
+    if (Instance->Dhcp4SbNotifyEvent == NULL) {
+      Instance->Dhcp4SbNotifyEvent = EfiCreateProtocolNotifyEvent (
+                                       &gEfiDhcp4ServiceBindingProtocolGuid,
+                                       TPL_CALLBACK,
+                                       Ip4Config2OnDhcp4SbInstalled,
+                                       (VOID *) Instance,
+                                       &Instance->Registration
+                                       );
+    }
+  }
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  if (Instance->Dhcp4SbNotifyEvent != NULL) {
+    gBS->CloseEvent (Instance->Dhcp4SbNotifyEvent);
+  }
+
+  Status = gBS->OpenProtocol (
+                  Instance->Dhcp4Handle,
+                  &gEfiDhcp4ProtocolGuid,
+                  (VOID **) &Instance->Dhcp4,
+                  IpSb->Image,
+                  IpSb->Controller,
+                  EFI_OPEN_PROTOCOL_BY_DRIVER
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+
+  //
+  // Check the current DHCP status, if the DHCP process has
+  // already finished, return now.
+  //
+  Dhcp4  = Instance->Dhcp4;
+  Status = Dhcp4->GetModeData (Dhcp4, &Dhcp4Mode);
+
+  if (Dhcp4Mode.State == Dhcp4Bound) {
+    Ip4Config2OnDhcp4Complete (NULL, Instance);
+    return EFI_SUCCESS;
+
+  }
+
+  //
+  // Try to start the DHCP process. Use most of the current
+  // DHCP configuration to avoid problems if some DHCP client
+  // yields the control of this DHCP service to us.
+  //
+  ParaList.Head.OpCode             = DHCP_TAG_PARA_LIST;
+  ParaList.Head.Length             = 2;
+  ParaList.Head.Data[0]            = DHCP_TAG_NETMASK;
+  ParaList.Route                   = DHCP_TAG_ROUTER;
+  OptionList[0]                    = &ParaList.Head;
+  Dhcp4Mode.ConfigData.OptionCount = 1;
+  Dhcp4Mode.ConfigData.OptionList  = OptionList;
+
+  Status = Dhcp4->Configure (Dhcp4, &Dhcp4Mode.ConfigData);
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+  
+  //
+  // Start the DHCP process
+  //
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  Ip4Config2OnDhcp4Complete,
+                  Instance,
+                  &Instance->Dhcp4Event
+                  );
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  Status = Dhcp4->Start (Dhcp4, Instance->Dhcp4Event);
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+ 
+  IpSb->State     = IP4_SERVICE_STARTED;
+  DispatchDpc ();
+  return EFI_SUCCESS;
+
+}
+
+
+
+/**
+  The work function is to get the interface information of the communication 
+  device this IP4_CONFIG2_INSTANCE manages.
+
+  @param[in]      Instance Pointer to the IP4 config2 instance data.
+  @param[in, out] DataSize On input, in bytes, the size of Data. On output, in
+                           bytes, the size of buffer required to store the 
specified
+                           configuration data.
+  @param[in]      Data     The data buffer in which the configuration data is 
returned.
+                           Ignored if DataSize is ZERO.
+
+  @retval EFI_BUFFER_TOO_SMALL The size of Data is too small for the specified
+                               configuration data, and the required size is
+                               returned in DataSize.
+  @retval EFI_SUCCESS          The specified configuration data was obtained.
+
+**/
+EFI_STATUS
+Ip4Config2GetIfInfo (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN OUT UINTN            *DataSize,
+  IN VOID                 *Data      OPTIONAL
+  )
+{
+
+  IP4_SERVICE                    *IpSb;
+  UINTN                          Length;
+  IP4_CONFIG2_DATA_ITEM          *Item;
+  EFI_IP4_CONFIG2_INTERFACE_INFO *IfInfo;
+  IP4_ADDR                       Address;
+
+  IpSb   = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  Length = sizeof (EFI_IP4_CONFIG2_INTERFACE_INFO);
+
+  if (IpSb->DefaultRouteTable != NULL) {
+    Length += IpSb->DefaultRouteTable->TotalNum * sizeof (EFI_IP4_ROUTE_TABLE);
+  }
+  
+  if (*DataSize < Length) {
+    *DataSize = Length;
+    return EFI_BUFFER_TOO_SMALL;
+  }
+
+  //
+  // Copy the fixed size part of the interface info.
+  //
+  Item = &Instance->DataItem[Ip4Config2DataTypeInterfaceInfo];
+  IfInfo = (EFI_IP4_CONFIG2_INTERFACE_INFO *) Data;
+  CopyMem (IfInfo, Item->Data.Ptr, sizeof (EFI_IP4_CONFIG2_INTERFACE_INFO));
+
+  //
+  // Update the address info.
+  //
+  if (IpSb->DefaultInterface != NULL) {
+    Address = HTONL (IpSb->DefaultInterface->Ip);
+    CopyMem (&IfInfo->StationAddress, &Address, sizeof (EFI_IPv4_ADDRESS));
+    Address = HTONL (IpSb->DefaultInterface->SubnetMask);
+    CopyMem (&IfInfo->SubnetMask, &Address, sizeof (EFI_IPv4_ADDRESS));
+  }
+
+  if (IpSb->DefaultRouteTable != NULL) {
+    IfInfo->RouteTableSize = IpSb->DefaultRouteTable->TotalNum;
+    IfInfo->RouteTable   = (EFI_IP4_ROUTE_TABLE *) ((UINT8 *) Data + sizeof 
(EFI_IP4_CONFIG2_INTERFACE_INFO));
+
+    Ip4Config2BuildDefaultRouteTable (IpSb, IfInfo->RouteTable);  
+  }
+  
+  return EFI_SUCCESS;
+}
+
+/**
+  The work function is to set the general configuration policy for the EFI 
IPv4 network 
+  stack that is running on the communication device managed by this 
IP4_CONFIG2_INSTANCE.
+  The policy will affect other configuration settings.
+
+  @param[in]     Instance Pointer to the IP4 config2 instance data.
+  @param[in]     DataSize Size of the buffer pointed to by Data in bytes.
+  @param[in]     Data     The data buffer to set.
+
+  @retval EFI_INVALID_PARAMETER The to be set policy is invalid.
+  @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the 
type.
+  @retval EFI_ABORTED           The new policy equals the current policy.
+  @retval EFI_SUCCESS           The specified configuration data for the EFI 
IPv6
+                                network stack was set.
+
+**/
+EFI_STATUS
+Ip4Config2SetPolicy (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN UINTN                DataSize,
+  IN VOID                 *Data
+  )
+{
+  EFI_IP4_CONFIG2_POLICY NewPolicy;
+  IP4_CONFIG2_DATA_ITEM  *DataItem;
+  IP4_SERVICE            *IpSb;
+
+  if (DataSize != sizeof (EFI_IP4_CONFIG2_POLICY)) {
+    return EFI_BAD_BUFFER_SIZE;
+  }
+
+  NewPolicy = *((EFI_IP4_CONFIG2_POLICY *) Data);
+
+  if (NewPolicy >= Ip4Config2PolicyMax) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (NewPolicy == Instance->Policy) {
+    if (NewPolicy != Ip4Config2PolicyDhcp || Instance->DhcpSuccess) {
+      return EFI_ABORTED;
+    }
+    
+  } else {
+    if (NewPolicy == Ip4Config2PolicyDhcp) {
+      //
+      // The policy is changed from static to dhcp:
+      // Clean the ManualAddress, Gateway and DnsServers, shrink the variable
+      // data size, and fire up all the related events.
+      //
+      DataItem           = 
&Instance->DataItem[Ip4Config2DataTypeManualAddress];
+      if (DataItem->Data.Ptr != NULL) {
+        FreePool (DataItem->Data.Ptr);
+      }
+      DataItem->Data.Ptr = NULL;
+      DataItem->DataSize = 0;
+      DataItem->Status   = EFI_NOT_FOUND;
+      NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
+
+      DataItem           = &Instance->DataItem[Ip4Config2DataTypeGateway];
+      if (DataItem->Data.Ptr != NULL) {
+        FreePool (DataItem->Data.Ptr);
+      }
+      DataItem->Data.Ptr = NULL;
+      DataItem->DataSize = 0;
+      DataItem->Status   = EFI_NOT_FOUND;
+      NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
+
+      DataItem           = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
+      if (DataItem->Data.Ptr != NULL) {
+        FreePool (DataItem->Data.Ptr);
+      }
+      DataItem->Data.Ptr = NULL;
+      DataItem->DataSize = 0;
+      DataItem->Status   = EFI_NOT_FOUND;
+      NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
+    } else {
+      //
+      // The policy is changed from dhcp to static. Stop the DHCPv4 process
+      // and destroy the DHCPv4 child.
+      //
+      if (Instance->Dhcp4Handle != NULL) {
+        Ip4Config2DestroyDhcp4 (Instance);
+      }
+      
+      //
+      // Close the event.
+      //
+      if (Instance->Dhcp4Event != NULL) {
+        gBS->CloseEvent (Instance->Dhcp4Event);
+      }
+    }
+  }
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  Ip4Config2OnPolicyChanged (IpSb, NewPolicy);
+
+  Instance->Policy = NewPolicy;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  The work function is to set the station addresses manually for the EFI IPv4 
+  network stack. It is only configurable when the policy is 
Ip4Config2PolicyStatic.
+
+  @param[in]     Instance Pointer to the IP4 config2 instance data.
+  @param[in]     DataSize Size of the buffer pointed to by Data in bytes.
+  @param[in]     Data     The data buffer to set.
+
+  @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the 
type.
+  @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
+                                under the current policy.
+  @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
+  @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the 
operation.
+  @retval EFI_NOT_READY         An asynchrous process is invoked to set the 
specified
+                                configuration data, and the process is not 
finished.
+  @retval EFI_ABORTED           The manual addresses to be set equal current
+                                configuration.
+  @retval EFI_SUCCESS           The specified configuration data for the EFI 
IPv6
+                                network stack was set.
+
+**/
+EFI_STATUS
+Ip4Config2SetMaunualAddress (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN UINTN                DataSize,
+  IN VOID                 *Data
+  )
+{
+  EFI_IP4_CONFIG2_MANUAL_ADDRESS NewAddress;
+  IP4_CONFIG2_DATA_ITEM          *DataItem;
+  EFI_STATUS                     Status;
+  IP4_ADDR                       StationAddress;
+  IP4_ADDR                       SubnetMask;
+  VOID                           *Ptr;
+
+  ASSERT (Instance->DataItem[Ip4Config2DataTypeManualAddress].Status != 
EFI_NOT_READY);
+
+  if (((DataSize % sizeof (EFI_IP4_CONFIG2_MANUAL_ADDRESS)) != 0) || (DataSize 
== 0)) {
+    return EFI_BAD_BUFFER_SIZE;
+  }
+
+  if (Instance->Policy != Ip4Config2PolicyStatic) {
+    return EFI_WRITE_PROTECTED;
+  }
+
+  NewAddress = *((EFI_IP4_CONFIG2_MANUAL_ADDRESS *) Data);
+
+  //
+  // Store the new data, and init the DataItem status to EFI_NOT_READY because
+  // we may have an asynchronous configuration process.
+  //
+  Ptr = AllocateCopyPool (DataSize, Data);
+  if (Ptr == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  DataItem = &Instance->DataItem[Ip4Config2DataTypeManualAddress];
+  if (DataItem->Data.Ptr != NULL) {
+    FreePool (DataItem->Data.Ptr);
+  }
+  
+  DataItem->Data.Ptr = Ptr;
+  DataItem->DataSize = DataSize;
+  DataItem->Status   = EFI_NOT_READY;
+
+  StationAddress = EFI_NTOHL (NewAddress.Address);
+  SubnetMask = EFI_NTOHL (NewAddress.SubnetMask);
+
+  Status = Ip4Config2SetDefaultAddr (Instance, StationAddress, SubnetMask);
+  if (EFI_ERROR (Status)) {
+    goto ON_EXIT;
+  }  
+
+  DataItem->Status = EFI_SUCCESS;   
+
+ON_EXIT:
+  if (EFI_ERROR (DataItem->Status)) {
+    if (Ptr != NULL) {
+      FreePool (Ptr);
+    }
+    DataItem->Data.Ptr = NULL; 
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  The work function is to set the gateway addresses manually for the EFI IPv4 
+  network stack that is running on the communication device that this EFI IPv4 
+  Configuration Protocol manages. It is not configurable when the policy is
+  Ip4Config2PolicyDhcp. The gateway addresses must be unicast IPv4 addresses.
+
+  @param[in]     Instance The pointer to the IP4 config2 instance data.
+  @param[in]     DataSize The size of the buffer pointed to by Data in bytes.
+  @param[in]     Data     The data buffer to set. This points to an array of
+                          EFI_IPv6_ADDRESS instances.
+
+  @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the 
type.
+  @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
+                                under the current policy.
+  @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource to complete the 
operation.
+  @retval EFI_ABORTED           The manual gateway addresses to be set equal 
the
+                                current configuration.
+  @retval EFI_SUCCESS           The specified configuration data for the EFI 
IPv6
+                                network stack was set.
+
+**/
+EFI_STATUS
+Ip4Config2SetGateway (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN UINTN                DataSize,
+  IN VOID                 *Data
+  )
+{
+  IP4_SERVICE                    *IpSb;
+  IP4_CONFIG2_DATA_ITEM          *DataItem;
+  IP4_ADDR                       Gateway;
+
+  UINTN                 Index1;
+  UINTN                 Index2;
+  EFI_IPv4_ADDRESS      *OldGateway;
+  EFI_IPv4_ADDRESS      *NewGateway;
+  UINTN                 OldGatewayCount;
+  UINTN                 NewGatewayCount;
+  BOOLEAN               OneRemoved;
+  BOOLEAN               OneAdded;
+  VOID                  *Tmp;
+
+  if ((DataSize % sizeof (EFI_IPv4_ADDRESS) != 0) || (DataSize == 0)) {
+    return EFI_BAD_BUFFER_SIZE;
+  }
+
+  if (Instance->Policy != Ip4Config2PolicyStatic) {
+    return EFI_WRITE_PROTECTED;
+  }
+
+
+  NewGateway      = (EFI_IPv4_ADDRESS *) Data;
+  NewGatewayCount = DataSize / sizeof (EFI_IPv4_ADDRESS);
+  for (Index1 = 0; Index1 < NewGatewayCount; Index1++) {
+    CopyMem (&Gateway, NewGateway + Index1, sizeof (IP4_ADDR));
+    
+    if (!NetIp4IsUnicast (NTOHL (Gateway), 0)) {
+
+      return EFI_INVALID_PARAMETER;
+    }
+
+    for (Index2 = Index1 + 1; Index2 < NewGatewayCount; Index2++) {
+      if (EFI_IP4_EQUAL (NewGateway + Index1, NewGateway + Index2)) {
+        return EFI_INVALID_PARAMETER;
+      }
+    }
+  }
+ 
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  DataItem = &Instance->DataItem[Ip4Config2DataTypeGateway];
+  OldGateway      = DataItem->Data.Gateway;
+  OldGatewayCount = DataItem->DataSize / sizeof (EFI_IPv4_ADDRESS);
+  OneRemoved      = FALSE;
+  OneAdded        = FALSE;
+
+  if (NewGatewayCount != OldGatewayCount) {
+    Tmp = AllocatePool (DataSize);
+    if (Tmp == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+  } else {
+    Tmp = NULL;
+  }
+
+  for (Index1 = 0; Index1 < OldGatewayCount; Index1++) {
+    //
+    // Remove this route entry.
+    //
+    CopyMem (&Gateway, OldGateway + Index1, sizeof (IP4_ADDR));
+    Ip4DelRoute (
+      IpSb->DefaultRouteTable,
+      IP4_ALLZERO_ADDRESS,
+      IP4_ALLZERO_ADDRESS,
+      NTOHL (Gateway)
+      );
+    OneRemoved = TRUE;
+
+  }
+
+  for (Index1 = 0; Index1 < NewGatewayCount; Index1++) {
+    CopyMem (&Gateway, NewGateway + Index1, sizeof (IP4_ADDR));
+    Ip4AddRoute (
+      IpSb->DefaultRouteTable,
+      IP4_ALLZERO_ADDRESS,
+      IP4_ALLZERO_ADDRESS,
+      NTOHL (Gateway)
+      );    
+
+    OneAdded = TRUE;
+  }
+
+
+  if (!OneRemoved && !OneAdded) {
+    DataItem->Status = EFI_SUCCESS;
+    return EFI_ABORTED;
+  } else {
+
+    if (Tmp != NULL) {
+      if (DataItem->Data.Ptr != NULL) {
+        FreePool (DataItem->Data.Ptr);
+      }
+      DataItem->Data.Ptr = Tmp;
+    }
+
+    CopyMem (DataItem->Data.Ptr, Data, DataSize);
+    DataItem->DataSize = DataSize;
+    DataItem->Status   = EFI_SUCCESS;
+    return EFI_SUCCESS;
+  }
+
+}
+
+/**
+  The work function is to set the DNS server list for the EFI IPv4 network 
+  stack running on the communication device that this EFI_IP4_CONFIG2_PROTOCOL 
+  manages. It is not configurable when the policy is Ip4Config2PolicyDhcp. 
+  The DNS server addresses must be unicast IPv4 addresses.
+
+  @param[in]     Instance The pointer to the IP4 config2 instance data.
+  @param[in]     DataSize The size of the buffer pointed to by Data in bytes.
+  @param[in]     Data     The data buffer to set, points to an array of
+                          EFI_IPv4_ADDRESS instances.
+
+  @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the 
type.
+  @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
+                                under the current policy.
+  @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resources to complete the 
operation.
+  @retval EFI_ABORTED           The DNS server addresses to be set equal the 
current
+                                configuration.
+  @retval EFI_SUCCESS           The specified configuration data for the EFI 
IPv4
+                                network stack was set.
+
+**/
+EFI_STATUS
+Ip4Config2SetDnsServer (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN UINTN                DataSize,
+  IN VOID                 *Data
+  )
+{
+  UINTN                 OldIndex;
+  UINTN                 NewIndex;
+  UINTN                 Index1;
+  EFI_IPv4_ADDRESS      *OldDns;
+  EFI_IPv4_ADDRESS      *NewDns;
+  UINTN                 OldDnsCount;
+  UINTN                 NewDnsCount;
+  IP4_CONFIG2_DATA_ITEM *Item;
+  BOOLEAN               OneAdded;
+  VOID                  *Tmp;
+  IP4_ADDR              DnsAddress;
+
+  if ((DataSize % sizeof (EFI_IPv4_ADDRESS) != 0) || (DataSize == 0)) {
+    return EFI_BAD_BUFFER_SIZE;
+  }
+
+  if (Instance->Policy != Ip4Config2PolicyStatic) {
+    return EFI_WRITE_PROTECTED;
+  }
+
+  Item        = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
+  NewDns      = (EFI_IPv4_ADDRESS *) Data;
+  OldDns      = Item->Data.DnsServers;
+  NewDnsCount = DataSize / sizeof (EFI_IPv4_ADDRESS);
+  OldDnsCount = Item->DataSize / sizeof (EFI_IPv4_ADDRESS);
+  OneAdded    = FALSE;
+
+  if (NewDnsCount != OldDnsCount) {
+    Tmp = AllocatePool (DataSize);
+    if (Tmp == NULL) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+  } else {
+    Tmp = NULL;
+  }
+
+  for (NewIndex = 0; NewIndex < NewDnsCount; NewIndex++) {
+    CopyMem (&DnsAddress, NewDns + NewIndex, sizeof (IP4_ADDR));
+
+    if (!NetIp4IsUnicast (NTOHL (DnsAddress), 0)) {
+      //
+      // The dns server address must be unicast.
+      //
+      FreePool (Tmp);
+      return EFI_INVALID_PARAMETER;
+    }
+
+    for (Index1 = NewIndex + 1; Index1 < NewDnsCount; Index1++) {
+      if (EFI_IP4_EQUAL (NewDns + NewIndex, NewDns + Index1)) {
+        FreePool (Tmp);
+        return EFI_INVALID_PARAMETER;
+      }
+    }
+
+    if (OneAdded) {
+      //
+      // If any address in the new setting is not in the old settings, skip the
+      // comparision below.
+      //
+      continue;
+    }
+
+    for (OldIndex = 0; OldIndex < OldDnsCount; OldIndex++) {
+      if (EFI_IP4_EQUAL (NewDns + NewIndex, OldDns + OldIndex)) {
+        //
+        // If found break out.
+        //
+        break;
+      }
+    }
+
+    if (OldIndex == OldDnsCount) {
+      OneAdded = TRUE;
+    }
+  }
+
+  if (!OneAdded && (DataSize == Item->DataSize)) {
+    //
+    // No new item is added and the size is the same.
+    //
+    Item->Status = EFI_SUCCESS;
+    return EFI_ABORTED;
+  } else {
+    if (Tmp != NULL) {
+      if (Item->Data.Ptr != NULL) {
+        FreePool (Item->Data.Ptr);
+      }      
+      Item->Data.Ptr = Tmp;
+    }
+
+    CopyMem (Item->Data.Ptr, Data, DataSize);
+    Item->DataSize = DataSize;
+    Item->Status   = EFI_SUCCESS;
+    return EFI_SUCCESS;
+  }
+
+}
+
+/**
+  Generate the operational state of the interface this IP4 config2 instance 
manages
+  and output in EFI_IP4_CONFIG2_INTERFACE_INFO.
+
+  @param[in]      IpSb     The pointer to the IP4 service binding instance.
+  @param[out]     IfInfo   The pointer to the IP4 config2 interface 
information structure.
+
+**/
+VOID
+Ip4Config2InitIfInfo (
+  IN  IP4_SERVICE                    *IpSb,
+  OUT EFI_IP4_CONFIG2_INTERFACE_INFO *IfInfo
+  )
+{
+  IfInfo->Name[0] = L'e';
+  IfInfo->Name[1] = L't';
+  IfInfo->Name[2] = L'h';
+  IfInfo->Name[3] = (CHAR16) (L'0' + IpSb->Ip4Config2Instance.IfIndex);
+  IfInfo->Name[4] = 0;
+
+  IfInfo->IfType        = IpSb->SnpMode.IfType;
+  IfInfo->HwAddressSize = IpSb->SnpMode.HwAddressSize;
+  CopyMem (&IfInfo->HwAddress, &IpSb->SnpMode.CurrentAddress, 
IfInfo->HwAddressSize);
+}
+
+/**
+  The event handle routine when DHCPv4 process is finished or is updated.
+
+  @param[in]     Event         Not used.
+  @param[in]     Context       The pointer to the IP4 configuration instance 
data.
+
+**/
+VOID
+EFIAPI
+Ip4Config2OnDhcp4Event (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  return ;
+}
+
+
+/**
+  Set the configuration for the EFI IPv4 network stack running on the 
communication
+  device this EFI_IP4_CONFIG2_PROTOCOL instance manages.
+
+  This function is used to set the configuration data of type DataType for the 
EFI
+  IPv4 network stack that is running on the communication device that this EFI 
IPv4
+  Configuration Protocol instance manages.
+
+  DataSize is used to calculate the count of structure instances in the Data 
for
+  a DataType in which multiple structure instances are allowed.
+
+  This function is always non-blocking. When setting some type of 
configuration data,
+  an asynchronous process is invoked to check the correctness of the data, 
such as
+  performing Duplicate Address Detection on the manually set local IPv4 
addresses.
+  EFI_NOT_READY is returned immediately to indicate that such an asynchronous 
process
+  is invoked, and the process is not finished yet. The caller wanting to get 
the result
+  of the asynchronous process is required to call RegisterDataNotify() to 
register an
+  event on the specified configuration data. Once the event is signaled, the 
caller
+  can call GetData() to obtain the configuration data and know the result.
+  For other types of configuration data that do not require an asynchronous 
configuration
+  process, the result of the operation is immediately returned.
+
+  @param[in]     This           The pointer to the EFI_IP4_CONFIG2_PROTOCOL 
instance.
+  @param[in]     DataType       The type of data to set.
+  @param[in]     DataSize       Size of the buffer pointed to by Data in bytes.
+  @param[in]     Data           The data buffer to set. The type of the data 
buffer is
+                                associated with the DataType.
+
+  @retval EFI_SUCCESS           The specified configuration data for the EFI 
IPv6
+                                network stack was set successfully.
+  @retval EFI_INVALID_PARAMETER One or more of the following are TRUE:
+                                - This is NULL.
+                                - Data is NULL.
+                                - One or more fields in Data do not match the 
requirement of the
+                                  data type indicated by DataType.
+  @retval EFI_WRITE_PROTECTED   The specified configuration data is read-only 
or the specified
+                                configuration data cannot be set under the 
current policy.
+  @retval EFI_ACCESS_DENIED     Another set operation on the specified 
configuration
+                                data is already in process.
+  @retval EFI_NOT_READY         An asynchronous process was invoked to set the 
specified
+                                configuration data, and the process is not 
finished yet.
+  @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the 
type
+                                indicated by DataType.
+  @retval EFI_UNSUPPORTED       This DataType is not supported.
+  @retval EFI_OUT_OF_RESOURCES  Required system resources could not be 
allocated.
+  @retval EFI_DEVICE_ERROR      An unexpected system error or network error 
occurred.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiIp4Config2SetData (
+  IN EFI_IP4_CONFIG2_PROTOCOL   *This,
+  IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
+  IN UINTN                      DataSize,
+  IN VOID                       *Data
+  )
+{
+  EFI_TPL              OldTpl;
+  EFI_STATUS           Status;
+  IP4_CONFIG2_INSTANCE *Instance;
+  IP4_SERVICE          *IpSb;
+
+  if ((This == NULL) || (Data == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (DataType >= Ip4Config2DataTypeMaximum) {
+    return EFI_UNSUPPORTED;
+  }
+
+  Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
+  IpSb     = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+  NET_CHECK_SIGNATURE (IpSb, IP4_SERVICE_SIGNATURE);
+
+
+  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+
+  Status = Instance->DataItem[DataType].Status;
+  if (Status != EFI_NOT_READY) {
+
+    if (Instance->DataItem[DataType].SetData == NULL) {
+      //
+      // This type of data is readonly.
+      //
+      Status = EFI_WRITE_PROTECTED;
+    } else {
+
+      Status = Instance->DataItem[DataType].SetData (Instance, DataSize, Data);
+      if (!EFI_ERROR (Status)) {
+        //
+        // Fire up the events registered with this type of data.
+        //
+        NetMapIterate (&Instance->DataItem[DataType].EventMap, 
Ip4Config2SignalEvent, NULL);
+        Ip4Config2WriteConfigData (IpSb->MacString, Instance);
+      } else if (Status == EFI_ABORTED) {
+        //
+        // The SetData is aborted because the data to set is the same with
+        // the one maintained.
+        //
+        Status = EFI_SUCCESS;
+        NetMapIterate (&Instance->DataItem[DataType].EventMap, 
Ip4Config2SignalEvent, NULL);
+      }
+    }
+  } else {
+    //
+    // Another asynchornous process is on the way.
+    //
+    Status = EFI_ACCESS_DENIED;
+  }
+
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}
+
+/**
+  Get the configuration data for the EFI IPv4 network stack running on the 
communication
+  device that this EFI_IP4_CONFIG2_PROTOCOL instance manages.
+
+  This function returns the configuration data of type DataType for the EFI 
IPv4 network
+  stack running on the communication device that this EFI IPv4 Configuration 
Protocol instance
+  manages.
+
+  The caller is responsible for allocating the buffer used to return the 
specified
+  configuration data. The required size will be returned to the caller if the 
size of
+  the buffer is too small.
+
+  EFI_NOT_READY is returned if the specified configuration data is not ready 
due to an
+  asynchronous configuration process already in progress. The caller can call 
RegisterDataNotify()
+  to register an event on the specified configuration data. Once the 
asynchronous configuration
+  process is finished, the event will be signaled, and a subsequent GetData() 
call will return
+  the specified configuration data.
+
+  @param[in]      This           Pointer to the EFI_IP4_CONFIG2_PROTOCOL 
instance.
+  @param[in]      DataType       The type of data to get.
+  @param[in, out] DataSize       On input, in bytes, the size of Data. On 
output, in bytes, the
+                                 size of buffer required to store the 
specified configuration data.
+  @param[in]     Data            The data buffer in which the configuration 
data is returned. The
+                                 type of the data buffer is associated with 
the DataType.
+                                 This is an optional parameter that may be 
NULL.
+
+  @retval EFI_SUCCESS           The specified configuration data was obtained 
successfully.
+  @retval EFI_INVALID_PARAMETER One or more of the followings are TRUE:
+                                - This is NULL.
+                                - DataSize is NULL.
+                                - Data is NULL if *DataSize is not zero.
+  @retval EFI_BUFFER_TOO_SMALL  The size of Data is too small for the 
specified configuration data,
+                                and the required size is returned in DataSize.
+  @retval EFI_NOT_READY         The specified configuration data is not ready 
due to an
+                                asynchronous configuration process already in 
progress.
+  @retval EFI_NOT_FOUND         The specified configuration data is not found.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiIp4Config2GetData (
+  IN EFI_IP4_CONFIG2_PROTOCOL   *This,
+  IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
+  IN OUT UINTN                  *DataSize,
+  IN VOID                       *Data   OPTIONAL
+  )
+{
+  EFI_TPL               OldTpl;
+  EFI_STATUS            Status;
+  IP4_CONFIG2_INSTANCE  *Instance;
+  IP4_CONFIG2_DATA_ITEM *DataItem;
+
+  if ((This == NULL) || (DataSize == NULL) || ((*DataSize != 0) && (Data == 
NULL))) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (DataType >= Ip4Config2DataTypeMaximum) {
+    return EFI_NOT_FOUND;
+  }
+
+  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+
+  Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
+  DataItem = &Instance->DataItem[DataType];
+
+  Status   = Instance->DataItem[DataType].Status;
+  if (!EFI_ERROR (Status)) {
+
+    if (DataItem->GetData != NULL) {
+
+      Status = DataItem->GetData (Instance, DataSize, Data);
+    } else if (*DataSize < Instance->DataItem[DataType].DataSize) {
+      //
+      // Update the buffer length.
+      //
+      *DataSize = Instance->DataItem[DataType].DataSize;
+      Status    = EFI_BUFFER_TOO_SMALL;
+    } else {
+
+      *DataSize = Instance->DataItem[DataType].DataSize;
+      CopyMem (Data, Instance->DataItem[DataType].Data.Ptr, *DataSize);
+    }
+  }
+
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}
+
+/**
+  Register an event that is signaled whenever a configuration process on the 
specified
+  configuration data is done.
+
+  This function registers an event that is to be signaled whenever a 
configuration
+  process on the specified configuration data is performed. An event can be 
registered
+  for a different DataType simultaneously. The caller is responsible for 
determining
+  which type of configuration data causes the signaling of the event in such 
an event.
+
+  @param[in]     This           Pointer to the EFI_IP4_CONFIG2_PROTOCOL 
instance.
+  @param[in]     DataType       The type of data to unregister the event for.
+  @param[in]     Event          The event to register.
+
+  @retval EFI_SUCCESS           The notification event for the specified 
configuration data is
+                                registered.
+  @retval EFI_INVALID_PARAMETER This is NULL or Event is NULL.
+  @retval EFI_UNSUPPORTED       The configuration data type specified by 
DataType is not
+                                supported.
+  @retval EFI_OUT_OF_RESOURCES  Required system resources could not be 
allocated.
+  @retval EFI_ACCESS_DENIED     The Event is already registered for the 
DataType.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiIp4Config2RegisterDataNotify (
+  IN EFI_IP4_CONFIG2_PROTOCOL   *This,
+  IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
+  IN EFI_EVENT                  Event
+  )
+{
+  EFI_TPL              OldTpl;
+  EFI_STATUS           Status;
+  IP4_CONFIG2_INSTANCE *Instance;
+  NET_MAP              *EventMap;
+  NET_MAP_ITEM         *Item;
+
+  if ((This == NULL) || (Event == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (DataType >= Ip4Config2DataTypeMaximum) {
+    return EFI_UNSUPPORTED;
+  }
+
+  OldTpl    = gBS->RaiseTPL (TPL_CALLBACK);
+
+  Instance  = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
+  EventMap  = &Instance->DataItem[DataType].EventMap;
+
+  //
+  // Check whether this event is already registered for this DataType.
+  //
+  Item = NetMapFindKey (EventMap, Event);
+  if (Item == NULL) {
+
+    Status = NetMapInsertTail (EventMap, Event, NULL);
+
+    if (EFI_ERROR (Status)) {
+
+      Status = EFI_OUT_OF_RESOURCES;
+    }
+
+  } else {
+
+    Status = EFI_ACCESS_DENIED;
+  }
+
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}
+
+/**
+  Remove a previously registered event for the specified configuration data.
+
+  @param  This                   The pointer to the EFI_IP4_CONFIG2_PROTOCOL 
instance.
+  @param  DataType               The type of data to remove from the previously
+                                 registered event.
+  @param  Event                  The event to be unregistered.
+
+  @retval EFI_SUCCESS            The event registered for the specified
+                                 configuration data was removed.
+  @retval EFI_INVALID_PARAMETER  This is NULL or Event is NULL.
+  @retval EFI_NOT_FOUND          The Event has not been registered for the
+                                 specified DataType.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiIp4Config2UnregisterDataNotify (
+  IN EFI_IP4_CONFIG2_PROTOCOL   *This,
+  IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
+  IN EFI_EVENT                  Event
+  )
+{
+  EFI_TPL              OldTpl;
+  EFI_STATUS           Status;
+  IP4_CONFIG2_INSTANCE *Instance;
+  NET_MAP_ITEM         *Item;
+
+  if ((This == NULL) || (Event == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (DataType >= Ip4Config2DataTypeMaximum) {
+    return EFI_NOT_FOUND;
+  }
+
+  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+
+  Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
+
+  Item = NetMapFindKey (&Instance->DataItem[DataType].EventMap, Event);
+  if (Item != NULL) {
+
+    NetMapRemoveItem (&Instance->DataItem[DataType].EventMap, Item, NULL);
+    Status = EFI_SUCCESS;
+  } else {
+
+    Status = EFI_NOT_FOUND;
+  }
+
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}
+
+/**
+  Initialize an IP4_CONFIG2_INSTANCE.
+
+  @param[out]    Instance       The buffer of IP4_CONFIG2_INSTANCE to be 
initialized.
+
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resources to complete the 
operation.
+  @retval EFI_SUCCESS           The IP4_CONFIG2_INSTANCE initialized 
successfully.
+
+**/
+EFI_STATUS
+Ip4Config2InitInstance (
+  OUT IP4_CONFIG2_INSTANCE  *Instance
+  )
+{
+  IP4_SERVICE           *IpSb;
+  IP4_CONFIG2_INSTANCE  *TmpInstance;
+  LIST_ENTRY            *Entry;
+  EFI_STATUS            Status;
+  UINTN                 Index;
+  UINT16                IfIndex;
+  IP4_CONFIG2_DATA_ITEM *DataItem;
+
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+
+  Instance->Signature = IP4_CONFIG2_INSTANCE_SIGNATURE;
+
+
+  //
+  // Determine the index of this interface.
+  //
+  IfIndex = 0;
+  NET_LIST_FOR_EACH (Entry, &mIp4Config2InstanceList) {
+    TmpInstance = NET_LIST_USER_STRUCT_S (Entry, IP4_CONFIG2_INSTANCE, Link, 
IP4_CONFIG2_INSTANCE_SIGNATURE);
+
+    if (TmpInstance->IfIndex > IfIndex) {
+      //
+      // There is a sequence hole because some interface is down.
+      //
+      break;
+    }
+
+    IfIndex++;
+  }
+
+  Instance->IfIndex = IfIndex;
+  NetListInsertBefore (Entry, &Instance->Link);
+
+  for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
+    //
+    // Initialize the event map for each data item.
+    //
+    NetMapInit (&Instance->DataItem[Index].EventMap);
+  }
+
+  
+  //
+  // Initialize each data type: associate storage and set data size for the
+  // fixed size data types, hook the SetData function, set the data attribute.
+  //
+  DataItem           = &Instance->DataItem[Ip4Config2DataTypeInterfaceInfo];
+  DataItem->GetData  = Ip4Config2GetIfInfo;
+  DataItem->Data.Ptr = &Instance->InterfaceInfo;
+  DataItem->DataSize = sizeof (Instance->InterfaceInfo);
+  SET_DATA_ATTRIB (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED | 
DATA_ATTRIB_VOLATILE);
+  Ip4Config2InitIfInfo (IpSb, &Instance->InterfaceInfo);
+
+  DataItem           = &Instance->DataItem[Ip4Config2DataTypePolicy];
+  DataItem->SetData  = Ip4Config2SetPolicy;
+  DataItem->Data.Ptr = &Instance->Policy;
+  DataItem->DataSize = sizeof (Instance->Policy);
+  Instance->Policy   = Ip4Config2PolicyDhcp;
+  SET_DATA_ATTRIB (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED);
+
+  DataItem           = &Instance->DataItem[Ip4Config2DataTypeManualAddress];
+  DataItem->SetData  = Ip4Config2SetMaunualAddress;
+  DataItem->Status   = EFI_NOT_FOUND;
+
+  DataItem           = &Instance->DataItem[Ip4Config2DataTypeGateway];
+  DataItem->SetData  = Ip4Config2SetGateway;
+  DataItem->Status   = EFI_NOT_FOUND;
+
+  DataItem           = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
+  DataItem->SetData  = Ip4Config2SetDnsServer;
+  DataItem->Status   = EFI_NOT_FOUND;
+
+  //
+  // Create the event used for DHCP.
+  //
+  Status = gBS->CreateEvent (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  Ip4Config2OnDhcp4Event,
+                  Instance,
+                  &Instance->Dhcp4Event
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  Instance->Configured  = TRUE;
+
+  //
+  // Try to read the config data from NV variable.
+  //
+  Status = Ip4Config2ReadConfigData (IpSb->MacString, Instance);
+  if (Status == EFI_NOT_FOUND) {
+    Status = Ip4Config2WriteConfigData (IpSb->MacString, Instance);
+  }
+
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Try to set the configured parameter.
+  //
+  for (Index = Ip4Config2DataTypePolicy; Index < Ip4Config2DataTypeMaximum; 
Index++) {
+    DataItem = &IpSb->Ip4Config2Instance.DataItem[Index];
+    if (DataItem->Data.Ptr != NULL) {
+      DataItem->SetData (
+                  &IpSb->Ip4Config2Instance,
+                  DataItem->DataSize,
+                  DataItem->Data.Ptr
+                  );
+    }
+  }
+
+  Instance->Ip4Config2.SetData              = EfiIp4Config2SetData;
+  Instance->Ip4Config2.GetData              = EfiIp4Config2GetData;
+  Instance->Ip4Config2.RegisterDataNotify   = EfiIp4Config2RegisterDataNotify;
+  Instance->Ip4Config2.UnregisterDataNotify = 
EfiIp4Config2UnregisterDataNotify;
+
+  //
+  // Publish the IP4 configuration form
+  //
+  return Ip4Config2FormInit (Instance);
+}
+
+
+/**
+  Release an IP4_CONFIG2_INSTANCE.
+
+  @param[in, out] Instance    The buffer of IP4_CONFIG2_INSTANCE to be freed.
+
+**/
+VOID
+Ip4Config2CleanInstance (
+  IN OUT IP4_CONFIG2_INSTANCE  *Instance
+  )
+{
+  UINTN                 Index;
+  IP4_CONFIG2_DATA_ITEM *DataItem;
+
+  if (Instance->DeclineAddress != NULL) {
+    FreePool (Instance->DeclineAddress);
+  }
+
+  if (!Instance->Configured) {
+    return ;
+  }
+
+  if (Instance->Dhcp4Handle != NULL) {
+
+    Ip4Config2DestroyDhcp4 (Instance);
+  }
+
+  //
+  // Close the event.
+  //
+  if (Instance->Dhcp4Event != NULL) {
+    gBS->CloseEvent (Instance->Dhcp4Event);
+  }
+
+  for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
+
+    DataItem = &Instance->DataItem[Index];
+
+    if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED)) {
+      if (DataItem->Data.Ptr != NULL) {
+        FreePool (DataItem->Data.Ptr);
+      }
+      DataItem->Data.Ptr = NULL;
+      DataItem->DataSize = 0;
+    }
+
+    NetMapClean (&Instance->DataItem[Index].EventMap);
+  }
+
+  Ip4Config2FormUnload (Instance);
+
+  RemoveEntryList (&Instance->Link);
+}
+

Added: trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.h
===================================================================
--- trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.h           
                (rev 0)
+++ trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.h   
2015-07-07 08:19:55 UTC (rev 17853)
@@ -0,0 +1,252 @@
+/** @file
+  Definitions for EFI IPv4 Configuration II Protocol implementation.
+
+  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD 
License
+  which accompanies this distribution.  The full text of the license may be 
found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __IP4_CONFIG2_IMPL_H__
+#define __IP4_CONFIG2_IMPL_H__
+
+#define IP4_CONFIG2_INSTANCE_SIGNATURE    SIGNATURE_32 ('I', 'P', 'C', '2')
+#define IP4_FORM_CALLBACK_INFO_SIGNATURE  SIGNATURE_32 ('I', 'F', 'C', 'I')
+
+#define IP4_CONFIG2_VARIABLE_ATTRIBUTE    (EFI_VARIABLE_NON_VOLATILE | 
EFI_VARIABLE_BOOTSERVICE_ACCESS)
+
+#define DATA_ATTRIB_SIZE_FIXED              0x1
+#define DATA_ATTRIB_VOLATILE                0x2
+
+#define DHCP_TAG_PARA_LIST             55
+#define DHCP_TAG_NETMASK               1
+#define DHCP_TAG_ROUTER                3
+
+
+#define DATA_ATTRIB_SET(Attrib, Bits)       (BOOLEAN)((Attrib) & (Bits))
+#define SET_DATA_ATTRIB(Attrib, Bits)       ((Attrib) |= (Bits))
+
+typedef struct _IP4_CONFIG2_INSTANCE IP4_CONFIG2_INSTANCE;
+
+#define IP4_CONFIG2_INSTANCE_FROM_PROTOCOL(Proto) \
+  CR ((Proto), \
+      IP4_CONFIG2_INSTANCE, \
+      Ip4Config2, \
+      IP4_CONFIG2_INSTANCE_SIGNATURE \
+      )
+
+#define IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE(Instance) \
+  CR ((Instance), \
+      IP4_SERVICE, \
+      Ip4Config2Instance, \
+      IP4_SERVICE_SIGNATURE \
+      )
+
+#define IP4_CONFIG2_INSTANCE_FROM_FORM_CALLBACK(Callback) \
+  CR ((Callback), \
+      IP4_CONFIG2_INSTANCE, \
+      CallbackInfo, \
+      IP4_CONFIG2_INSTANCE_SIGNATURE \
+      )
+
+#define IP4_FORM_CALLBACK_INFO_FROM_CONFIG_ACCESS(ConfigAccess) \
+  CR ((ConfigAccess), \
+      IP4_FORM_CALLBACK_INFO, \
+      HiiConfigAccessProtocol, \
+      IP4_FORM_CALLBACK_INFO_SIGNATURE \
+      )
+
+/**
+  The prototype of work function for EfiIp4Config2SetData().
+
+  @param[in]     Instance The pointer to the IP4 config2 instance data.
+  @param[in]     DataSize In bytes, the size of the buffer pointed to by Data.
+  @param[in]     Data     The data buffer to set.
+
+  @retval EFI_BAD_BUFFER_SIZE  The DataSize does not match the size of the 
type,
+                               8 bytes.
+  @retval EFI_SUCCESS          The specified configuration data for the EFI 
IPv4
+                               network stack was set successfully.
+  
+**/
+typedef
+EFI_STATUS
+(*IP4_CONFIG2_SET_DATA) (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN UINTN                DataSize,
+  IN VOID                 *Data
+  );
+
+/**
+  The prototype of work function for EfiIp4Config2GetData().
+
+  @param[in]      Instance The pointer to the IP4 config2 instance data.
+  @param[in, out] DataSize On input, in bytes, the size of Data. On output, in
+                           bytes, the size of buffer required to store the 
specified
+                           configuration data.
+  @param[in]      Data     The data buffer in which the configuration data is 
returned.  
+                           Ignored if DataSize is ZERO.
+
+  @retval EFI_BUFFER_TOO_SMALL The size of Data is too small for the specified
+                               configuration data, and the required size is 
+                               returned in DataSize.
+  @retval EFI_SUCCESS          The specified configuration data was obtained 
successfully.                               
+  
+**/
+typedef
+EFI_STATUS
+(*IP4_CONFIG2_GET_DATA) (
+  IN IP4_CONFIG2_INSTANCE *Instance,
+  IN OUT UINTN            *DataSize,
+  IN VOID                 *Data      OPTIONAL
+  );
+
+typedef union {
+  VOID                                      *Ptr;
+  EFI_IP4_CONFIG2_INTERFACE_INFO            *IfInfo;
+  EFI_IP4_CONFIG2_POLICY                    *Policy;
+  EFI_IP4_CONFIG2_MANUAL_ADDRESS            *ManualAddress;
+  EFI_IPv4_ADDRESS                          *Gateway;
+  EFI_IPv4_ADDRESS                          *DnsServers;
+} IP4_CONFIG2_DATA;
+
+typedef struct {
+  IP4_CONFIG2_SET_DATA SetData;
+  IP4_CONFIG2_GET_DATA GetData;
+  EFI_STATUS           Status;
+  UINT8                Attribute;
+  NET_MAP              EventMap;
+  IP4_CONFIG2_DATA     Data;
+  UINTN                DataSize;
+} IP4_CONFIG2_DATA_ITEM;
+
+typedef struct {
+  UINT16                    Offset;
+  UINT32                    DataSize;
+  EFI_IP4_CONFIG2_DATA_TYPE DataType;
+} IP4_CONFIG2_DATA_RECORD;
+
+#pragma pack(1)
+
+//
+// heap data that contains the data for each data record.
+//
+//  EFI_IP4_CONFIG2_POLICY                    Policy;
+//  UINT32                                    ManualaddressCount;
+//  UINT32                                    GatewayCount;
+//  UINT32                                    DnsServersCount;
+//  EFI_IP4_CONFIG2_MANUAL_ADDRESS            ManualAddress[];
+//  EFI_IPv4_ADDRESS                          Gateway[];
+//  EFI_IPv4_ADDRESS                          DnsServers[];
+//
+typedef struct {
+  UINT16                  Checksum;
+  UINT16                  DataRecordCount;
+  IP4_CONFIG2_DATA_RECORD DataRecord[1];
+} IP4_CONFIG2_VARIABLE;
+
+#pragma pack()
+
+typedef struct {
+  EFI_IP4_CONFIG2_POLICY                   Policy;               ///< manual 
or automatic  
+  EFI_IP4_CONFIG2_MANUAL_ADDRESS           *ManualAddress;       ///< IP 
addresses
+  UINT32                                   ManualAddressCount;   ///< IP 
addresses count
+  EFI_IPv4_ADDRESS                         *GatewayAddress;      ///< Gateway 
address
+  UINT32                                   GatewayAddressCount;  ///< Gateway 
address count
+  EFI_IPv4_ADDRESS                         *DnsAddress;          ///< DNS 
server address
+  UINT32                                   DnsAddressCount;      ///< DNS 
server address count
+} IP4_CONFIG2_NVDATA;
+
+typedef struct _IP4_FORM_CALLBACK_INFO {
+  UINT32                           Signature;
+  EFI_HANDLE                       ChildHandle;
+  EFI_HII_CONFIG_ACCESS_PROTOCOL   HiiConfigAccessProtocol;
+  EFI_DEVICE_PATH_PROTOCOL         *HiiVendorDevicePath;
+  EFI_HII_HANDLE                   RegisteredHandle;
+} IP4_FORM_CALLBACK_INFO;
+
+struct _IP4_CONFIG2_INSTANCE {
+  UINT32                                    Signature;
+  BOOLEAN                                   Configured;
+  LIST_ENTRY                                Link;
+  UINT16                                    IfIndex;
+
+  EFI_IP4_CONFIG2_PROTOCOL                  Ip4Config2;
+
+  EFI_IP4_CONFIG2_INTERFACE_INFO            InterfaceInfo;
+  EFI_IP4_CONFIG2_POLICY                    Policy;  
+  IP4_CONFIG2_DATA_ITEM                     
DataItem[Ip4Config2DataTypeMaximum];
+
+  EFI_EVENT                                 Dhcp4SbNotifyEvent;
+  VOID                                      *Registration;
+  EFI_HANDLE                                Dhcp4Handle;
+  EFI_DHCP4_PROTOCOL                        *Dhcp4;
+  BOOLEAN                                   DhcpSuccess;
+  BOOLEAN                                   OtherInfoOnly;
+  EFI_EVENT                                 Dhcp4Event;
+  UINT32                                    FailedIaAddressCount;
+  EFI_IPv4_ADDRESS                          *DeclineAddress;
+  UINT32                                    DeclineAddressCount;
+  
+  IP4_FORM_CALLBACK_INFO                    CallbackInfo;
+
+  IP4_CONFIG2_NVDATA                        Ip4NvData;
+};
+
+//
+// Configure the DHCP to request the routers and netmask
+// from server. The DHCP_TAG_NETMASK is included in Head.
+//
+#pragma pack(1)
+typedef struct {
+  EFI_DHCP4_PACKET_OPTION Head;
+  UINT8                   Route;
+} IP4_CONFIG2_DHCP4_OPTION;
+#pragma pack()
+
+/**
+  Initialize an IP4_CONFIG2_INSTANCE.
+
+  @param[out]    Instance       The buffer of IP4_CONFIG2_INSTANCE to be 
initialized.
+
+  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resources to complete the 
operation.
+  @retval EFI_SUCCESS           The IP4_CONFIG2_INSTANCE initialized 
successfully.
+
+**/
+EFI_STATUS
+Ip4Config2InitInstance (
+  OUT IP4_CONFIG2_INSTANCE  *Instance
+  );
+
+/**
+  Release an IP4_CONFIG2_INSTANCE.
+
+  @param[in, out] Instance    The buffer of IP4_CONFIG2_INSTANCE to be freed.
+
+**/
+VOID
+Ip4Config2CleanInstance (
+  IN OUT IP4_CONFIG2_INSTANCE  *Instance
+  );
+
+/**
+  Destroy the Dhcp4 child in IP4_CONFIG2_INSTANCE and release the resources.
+
+  @param[in, out] Instance    The buffer of IP4 config2 instance to be freed.
+
+  @retval EFI_SUCCESS         The child was successfully destroyed.
+  @retval Others              Failed to destroy the child.
+
+**/
+EFI_STATUS
+Ip4Config2DestroyDhcp4 (
+  IN OUT IP4_CONFIG2_INSTANCE  *Instance
+  );
+
+#endif

Added: trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Nv.c
===================================================================
--- trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Nv.c             
                (rev 0)
+++ trunk/edk2/MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Nv.c     
2015-07-07 08:19:55 UTC (rev 17853)
@@ -0,0 +1,1436 @@
+/** @file
+  Helper functions for configuring or getting the parameters relating to Ip4.
+
+Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD 
License
+which accompanies this distribution.  The full text of the license may be 
found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "Ip4Impl.h"
+
+CHAR16    mIp4Config2StorageName[]     = L"IP4_CONFIG2_IFR_NVDATA";
+
+/**
+  Calculate the prefix length of the IPv4 subnet mask.
+
+  @param[in]  SubnetMask The IPv4 subnet mask.
+
+  @return The prefix length of the subnet mask.
+  @retval 0 Other errors as indicated.
+  
+**/
+UINT8
+GetSubnetMaskPrefixLength (
+  IN EFI_IPv4_ADDRESS  *SubnetMask
+  )
+{
+  UINT8   Len;
+  UINT32  ReverseMask;
+
+  //
+  // The SubnetMask is in network byte order.
+  //
+  ReverseMask = SwapBytes32 (*(UINT32 *)&SubnetMask[0]);
+
+  //
+  // Reverse it.
+  //
+  ReverseMask = ~ReverseMask;
+
+  if ((ReverseMask & (ReverseMask + 1)) != 0) {
+    return 0;
+  }
+
+  Len = 0;
+
+  while (ReverseMask != 0) {
+    ReverseMask = ReverseMask >> 1;
+    Len++;
+  }
+
+  return (UINT8) (32 - Len);
+}
+
+/**
+  Convert the decimal dotted IPv4 address into the binary IPv4 address.
+
+  @param[in]   Str             The UNICODE string.
+  @param[out]  Ip              The storage to return the IPv4 address.
+
+  @retval EFI_SUCCESS           The binary IP address is returned in Ip.
+  @retval EFI_INVALID_PARAMETER The IP string is malformatted.
+  
+**/
+EFI_STATUS
+Ip4Config2StrToIp (
+  IN  CHAR16            *Str,
+  OUT EFI_IPv4_ADDRESS  *Ip
+  )
+{
+  UINTN Index;
+  UINTN Number;
+
+  Index = 0;
+
+  while (*Str != L'\0') {
+
+    if (Index > 3) {
+      return EFI_INVALID_PARAMETER;
+    }
+
+    Number = 0;
+    while ((*Str >= L'0') && (*Str <= L'9')) {
+      Number = Number * 10 + (*Str - L'0');
+      Str++;
+    }
+
+    if (Number > 0xFF) {
+      return EFI_INVALID_PARAMETER;
+    }
+
+    Ip->Addr[Index] = (UINT8) Number;
+
+    if ((*Str != L'\0') && (*Str != L'.')) {
+      //
+      // The current character should be either the NULL terminator or
+      // the dot delimiter.
+      //
+      return EFI_INVALID_PARAMETER;
+    }
+
+    if (*Str == L'.') {
+      //
+      // Skip the delimiter.
+      //
+      Str++;
+    }
+
+    Index++;
+  }
+
+  if (Index != 4) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Convert the decimal dotted IPv4 addresses separated by space into the binary 
IPv4 address list.
+
+  @param[in]   Str             The UNICODE string contains IPv4 addresses.
+  @param[out]  PtrIpList       The storage to return the IPv4 address list.
+  @param[out]  IpCount         The size of the IPv4 address list.
+
+  @retval EFI_SUCCESS           The binary IP address list is returned in 
PtrIpList.
+  @retval EFI_OUT_OF_RESOURCES  Error occurs in allocating memory.
+  @retval EFI_INVALID_PARAMETER The IP string is malformatted.
+  
+**/
+EFI_STATUS
+Ip4Config2StrToIpList (
+  IN  CHAR16            *Str,
+  OUT EFI_IPv4_ADDRESS  **PtrIpList,
+  OUT UINTN             *IpCount
+  )
+{
+  UINTN              BeginIndex;
+  UINTN              EndIndex; 
+  UINTN              Index;
+  UINTN              IpIndex;
+  CHAR16             *StrTemp;
+  BOOLEAN            SpaceTag;
+  
+  BeginIndex = 0;
+  EndIndex   = BeginIndex;
+  Index      = 0;
+  IpIndex    = 0;
+  StrTemp    = NULL;
+  SpaceTag   = TRUE;
+  
+  *PtrIpList = NULL;
+  *IpCount   = 0;
+
+  if (Str == NULL) {
+    return EFI_SUCCESS;
+  }
+
+  //
+  // Get the number of Ip.
+  //
+  while (*(Str + Index) != L'\0') {
+    if (*(Str + Index) == L' ') {
+      SpaceTag = TRUE;
+    } else {
+      if (SpaceTag) {
+        (*IpCount)++;
+        SpaceTag = FALSE;
+      }
+    }
+     
+    Index++;
+  }
+
+  if (*IpCount == 0) {
+    return EFI_SUCCESS;
+  }
+  
+  //
+  // Allocate buffer for IpList.
+  //
+  *PtrIpList = AllocateZeroPool(*IpCount * sizeof(EFI_IPv4_ADDRESS));
+  if (*PtrIpList == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  //
+  // Get IpList from Str.
+  //
+  Index = 0;
+  while (*(Str + Index) != L'\0') {
+    if (*(Str + Index) == L' ') {
+      if(!SpaceTag) {
+        StrTemp = AllocateZeroPool((EndIndex - BeginIndex + 1) * 
sizeof(CHAR16));
+        if (StrTemp == NULL) {
+          FreePool(*PtrIpList);
+          *PtrIpList = NULL;
+          *IpCount = 0;
+          return EFI_OUT_OF_RESOURCES;
+        }
+        
+        CopyMem (StrTemp, Str + BeginIndex, (EndIndex - BeginIndex) * 
sizeof(CHAR16));
+        *(StrTemp + (EndIndex - BeginIndex)) = L'\0';
+          
+        if (Ip4Config2StrToIp (StrTemp, &((*PtrIpList)[IpIndex])) != 
EFI_SUCCESS) {
+          FreePool(StrTemp);
+          FreePool(*PtrIpList);
+          *PtrIpList = NULL;
+          *IpCount = 0;
+          return EFI_INVALID_PARAMETER;
+        }
+          
+        BeginIndex = EndIndex;
+        IpIndex++;
+
+        FreePool(StrTemp);
+      }
+
+      BeginIndex++;
+      EndIndex++;
+      SpaceTag = TRUE;
+    } else {
+      EndIndex++;
+      SpaceTag = FALSE;
+    }
+    
+    Index++;
+    
+    if (*(Str + Index) == L'\0') {
+      if (!SpaceTag) {
+        StrTemp = AllocateZeroPool((EndIndex - BeginIndex + 1) * 
sizeof(CHAR16));
+        if (StrTemp == NULL) {
+          FreePool(*PtrIpList);
+          *PtrIpList = NULL;
+          *IpCount = 0;
+          return EFI_OUT_OF_RESOURCES;
+        }
+        
+        CopyMem (StrTemp, Str + BeginIndex, (EndIndex - BeginIndex) * 
sizeof(CHAR16));
+        *(StrTemp + (EndIndex - BeginIndex)) = L'\0';
+        
+        if (Ip4Config2StrToIp (StrTemp, &((*PtrIpList)[IpIndex])) != 
EFI_SUCCESS) {
+          FreePool(StrTemp);
+          FreePool(*PtrIpList);
+          *PtrIpList = NULL;
+          *IpCount = 0;
+          return EFI_INVALID_PARAMETER;
+        }
+
+        FreePool(StrTemp);
+      }
+    }
+  } 
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Convert the IPv4 address into a dotted string.
+
+  @param[in]   Ip   The IPv4 address.
+  @param[out]  Str  The dotted IP string.
+  
+**/
+VOID
+Ip4Config2IpToStr (
+  IN  EFI_IPv4_ADDRESS  *Ip,
+  OUT CHAR16            *Str
+  )
+{
+  UnicodeSPrint (
+    Str,
+    2 * IP4_STR_MAX_SIZE, 
+    L"%d.%d.%d.%d", 
+    Ip->Addr[0],
+    Ip->Addr[1],
+    Ip->Addr[2],
+    Ip->Addr[3]
+    );
+}
+
+
+/**
+  Convert the IPv4 address list into string consists of several decimal 
+  dotted IPv4 addresses separated by space.
+
+  @param[in]   Ip        The IPv4 address list.
+  @param[in]   IpCount   The size of IPv4 address list.
+  @param[out]  Str       The string contains several decimal dotted
+                         IPv4 addresses separated by space.       
+**/
+VOID
+Ip4Config2IpListToStr (
+  IN  EFI_IPv4_ADDRESS  *Ip,
+  IN  UINTN             IpCount,
+  OUT CHAR16            *Str
+  )
+{
+  UINTN            Index;
+  UINTN            TemIndex;
+  UINTN            StrIndex;
+  CHAR16           *TempStr;
+  EFI_IPv4_ADDRESS *TempIp;
+  
+  Index    = 0;
+  TemIndex = 0;
+  StrIndex = 0;
+  TempStr  = NULL;
+  TempIp   = NULL;
+
+  for (Index = 0; Index < IpCount; Index ++) {
+    TempIp = Ip + Index;
+    if (TempStr == NULL) {
+      TempStr = AllocateZeroPool(2 * IP4_STR_MAX_SIZE);
+      ASSERT(TempStr != NULL);
+    }
+
+    UnicodeSPrint (
+      TempStr, 
+      2 * IP4_STR_MAX_SIZE, 
+      L"%d.%d.%d.%d", 
+      TempIp->Addr[0],
+      TempIp->Addr[1],
+      TempIp->Addr[2],
+      TempIp->Addr[3]
+      );
+
+    for (TemIndex = 0; TemIndex < IP4_STR_MAX_SIZE; TemIndex ++) {
+      if (*(TempStr + TemIndex) == L'\0') {
+        if (Index == IpCount - 1) {
+          Str[StrIndex++] = L'\0';
+        } else {
+          Str[StrIndex++] = L' ';
+        }  
+        break;
+      } else {
+        Str[StrIndex++] = *(TempStr + TemIndex);
+      }
+    }
+  }
+
+  if (TempStr != NULL) {
+    FreePool(TempStr);
+  }
+}
+
+/**
+  The notify function of create event when performing a manual configuration.
+
+  @param[in]    Event        The pointer of Event.
+  @param[in]    Context      The pointer of Context.
+  
+**/
+VOID
+EFIAPI
+Ip4Config2ManualAddressNotify (
+  IN EFI_EVENT    Event,
+  IN VOID         *Context
+  )
+{
+  *((BOOLEAN *) Context) = TRUE;
+}
+
+/**
+  Convert the network configuration data into the IFR data.
+
+  @param[in]       Instance          The IP4 config2 instance.
+  @param[in, out]  IfrNvData         The IFR nv data.
+
+  @retval EFI_SUCCESS            The configure parameter to IFR data was
+                                 set successfully.
+  @retval EFI_INVALID_PARAMETER  Source instance or target IFR data is not 
available.
+  @retval Others                 Other errors as indicated.
+  
+**/
+EFI_STATUS
+Ip4Config2ConvertConfigNvDataToIfrNvData (
+  IN     IP4_CONFIG2_INSTANCE       *Instance,
+  IN OUT IP4_CONFIG2_IFR_NVDATA     *IfrNvData
+  )
+{
+  IP4_SERVICE                                *IpSb;
+  EFI_IP4_CONFIG2_PROTOCOL                   *Ip4Config2;
+  EFI_IP4_CONFIG2_INTERFACE_INFO             *Ip4Info;
+  EFI_IP4_CONFIG2_POLICY                     Policy;
+  UINTN                                      DataSize;
+  UINTN                                      GatewaySize;
+  EFI_IPv4_ADDRESS                           GatewayAddress;
+  EFI_STATUS                                 Status;
+  UINTN                                      DnsSize;
+  UINTN                                      DnsCount;
+  EFI_IPv4_ADDRESS                           *DnsAddress;
+
+  Status      = EFI_SUCCESS;
+  Ip4Config2  = &Instance->Ip4Config2;
+  Ip4Info     = NULL;
+  DnsAddress  = NULL;
+  GatewaySize = sizeof (EFI_IPv4_ADDRESS);
+  
+  if ((IfrNvData == NULL) || (Instance == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+  
+  NET_CHECK_SIGNATURE (Instance, IP4_CONFIG2_INSTANCE_SIGNATURE);
+
+  IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
+
+  if (IpSb->DefaultInterface->Configured) {
+    IfrNvData->Configure = 1;
+  } else {
+    IfrNvData->Configure = 0;
+    goto Exit;
+  }
+
+  //
+  // Get the Policy info.
+  // 
+  DataSize = sizeof (EFI_IP4_CONFIG2_POLICY);
+  Status   = Ip4Config2->GetData (
+                           Ip4Config2,
+                           Ip4Config2DataTypePolicy,
+                           &DataSize,
+                           &Policy
+                           );
+  if (EFI_ERROR (Status)) {
+    goto Exit;
+  }
+  
+  if (Policy == Ip4Config2PolicyStatic) {
+    IfrNvData->DhcpEnable = FALSE;
+  } else if (Policy == Ip4Config2PolicyDhcp) {
+    IfrNvData->DhcpEnable = TRUE;
+    goto Exit;
+  }
+  
+  //
+  // Get the interface info.
+  //
+  DataSize    = 0;
+  Status = Ip4Config2->GetData (
+                         Ip4Config2,
+                         Ip4Config2DataTypeInterfaceInfo,
+                         &DataSize,
+                         NULL
+                         );
+  if (Status != EFI_BUFFER_TOO_SMALL) {
+    return Status;
+  }
+  
+  Ip4Info = AllocateZeroPool (DataSize);
+  if (Ip4Info == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    return Status;
+  }
+
+  Status = Ip4Config2->GetData (
+                         Ip4Config2,
+                         Ip4Config2DataTypeInterfaceInfo,
+                         &DataSize,
+                         Ip4Info
+                         );
+  if (EFI_ERROR (Status)) {
+    goto Exit;
+  }
+  
+  //
+  // Get the Gateway info.
+  //
+  Status = Ip4Config2->GetData (
+                         Ip4Config2,
+                         Ip4Config2DataTypeGateway,
+                         &GatewaySize,
+                         &GatewayAddress
+                         );
+  if (EFI_ERROR (Status)) {
+    goto Exit;
+  }
+
+  //
+  // Get the Dns info.
+  //
+  DnsSize = 0;
+  Status = Ip4Config2->GetData (
+                         Ip4Config2,
+                         Ip4Config2DataTypeDnsServer,
+                         &DnsSize,
+                         NULL
+                         );
+  if ((Status != EFI_BUFFER_TOO_SMALL) && (Status != EFI_NOT_FOUND)) {
+    goto Exit;
+  }
+  
+  DnsCount = (UINT32) (DnsSize / sizeof (EFI_IPv4_ADDRESS));
+
+  if (DnsSize > 0) {
+    DnsAddress = AllocateZeroPool(DnsSize);
+    if (DnsAddress == NULL) {
+      Status = EFI_OUT_OF_RESOURCES;
+      goto Exit;
+    }
+    
+    Status = Ip4Config2->GetData (
+                           Ip4Config2,
+                           Ip4Config2DataTypeDnsServer,
+                           &DnsSize,
+                           DnsAddress
+                           );
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+  }
+
+  Ip4Config2IpToStr (&Ip4Info->StationAddress, IfrNvData->StationAddress);
+  Ip4Config2IpToStr (&Ip4Info->SubnetMask, IfrNvData->SubnetMask);
+  Ip4Config2IpToStr (&GatewayAddress, IfrNvData->GatewayAddress);
+  Ip4Config2IpListToStr (DnsAddress, DnsCount, IfrNvData->DnsAddress);
+
+Exit:
+
+  if (DnsAddress != NULL) {
+    FreePool(DnsAddress);
+  }
+
+  if (Ip4Info != NULL) {
+    FreePool(Ip4Info);
+  }
+  
+  return Status;
+}
+
+/**
+  Convert the IFR data into the network configuration data and set the IP
+  configure parameters for the NIC.
+
+  @param[in]       IfrFormNvData     The IFR NV data.
+  @param[in, out]  Instance          The IP4 config2 instance.
+
+  @retval EFI_SUCCESS            The configure parameter for this NIC was
+                                 set successfully.
+  @retval EFI_INVALID_PARAMETER  The address information for setting is 
invalid.
+  @retval Others                 Other errors as indicated.
+  
+**/
+EFI_STATUS
+Ip4Config2ConvertIfrNvDataToConfigNvData (
+  IN     IP4_CONFIG2_IFR_NVDATA     *IfrFormNvData,
+  IN OUT IP4_CONFIG2_INSTANCE       *Instance
+  )
+{
+  EFI_STATUS                       Status;  
+  EFI_IP4_CONFIG2_PROTOCOL         *Ip4Cfg2;
+  IP4_CONFIG2_NVDATA               *Ip4NvData; 
+
+  EFI_IP_ADDRESS                   StationAddress;
+  EFI_IP_ADDRESS                   SubnetMask;
+  EFI_IP_ADDRESS                   Gateway;
+  IP4_ADDR                         Ip;
+  EFI_IPv4_ADDRESS                 *DnsAddress;
+  UINTN                            DnsCount;
+  UINTN                            Index;
+
+  EFI_EVENT                        TimeoutEvent;
+  EFI_EVENT                        SetAddressEvent;
+  BOOLEAN                          IsAddressOk;
+  UINTN                            DataSize;
+  EFI_INPUT_KEY                    Key;
+
+  Status          = EFI_SUCCESS;
+  Ip4Cfg2         = &Instance->Ip4Config2;
+  Ip4NvData       = &Instance->Ip4NvData;
+  
+  DnsCount        = 0;
+  DnsAddress      = NULL; 
+  
+  TimeoutEvent    = NULL;
+  SetAddressEvent = NULL;
+
+
+  
+  if (Instance == NULL || IfrFormNvData == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  if (IfrFormNvData->Configure != TRUE) {
+    return EFI_SUCCESS;
+  }
+  
+  if (IfrFormNvData->DhcpEnable == TRUE) {
+    Ip4NvData->Policy = Ip4Config2PolicyDhcp;
+    
+    Status = Ip4Cfg2->SetData (
+                        Ip4Cfg2,
+                        Ip4Config2DataTypePolicy,
+                        sizeof (EFI_IP4_CONFIG2_POLICY),
+                        &Ip4NvData->Policy
+                        );
+    if (EFI_ERROR(Status)) {
+      return Status;
+    }
+  } else {
+    //
+    // Get Ip4NvData from IfrFormNvData if it is valid.
+    //
+    Ip4NvData->Policy = Ip4Config2PolicyStatic;
+
+    Status = Ip4Config2StrToIp (IfrFormNvData->StationAddress, 
&StationAddress.v4);
+    if (EFI_ERROR (Status) || !NetIp4IsUnicast (NTOHL 
(StationAddress.Addr[0]), 0)) {
+      CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, L"Invalid IP 
address!", NULL);
+      return EFI_INVALID_PARAMETER;
+    }
+    
+    Status = Ip4Config2StrToIp (IfrFormNvData->SubnetMask, &SubnetMask.v4);
+    if (EFI_ERROR (Status) || ((SubnetMask.Addr[0] != 0) && 
(GetSubnetMaskPrefixLength (&SubnetMask.v4) == 0))) {
+      CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, L"Invalid Subnet 
Mask!", NULL);
+      return EFI_INVALID_PARAMETER;
+    }
+    
+    Status = Ip4Config2StrToIp (IfrFormNvData->GatewayAddress, &Gateway.v4);
+    if (EFI_ERROR (Status) || ((Gateway.Addr[0] != 0) && !NetIp4IsUnicast 
(NTOHL (Gateway.Addr[0]), 0))) {
+      CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, L"Invalid 
Gateway!", NULL);
+      return EFI_INVALID_PARAMETER;
+    }
+
+    Status = Ip4Config2StrToIpList (IfrFormNvData->DnsAddress, &DnsAddress, 
&DnsCount);
+    if (!EFI_ERROR (Status) && DnsCount > 0) {
+      for (Index = 0; Index < DnsCount; Index ++) {
+        CopyMem (&Ip, &DnsAddress[Index], sizeof (IP4_ADDR));
+        if (!NetIp4IsUnicast (NTOHL (Ip), 0)) {
+          CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, L"Invalid 
Dns Server!", NULL);
+          FreePool(DnsAddress);
+          return EFI_INVALID_PARAMETER;
+        } 
+      } 
+    } else {
+      if (EFI_ERROR (Status)) {
+        CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, L"Invalid Dns 
Server!", NULL);
+      }
+    }
+    
+    if (Ip4NvData->ManualAddress != NULL) {
+      FreePool(Ip4NvData->ManualAddress); 
+    }
+    Ip4NvData->ManualAddressCount = 1;
+    Ip4NvData->ManualAddress = 
AllocateZeroPool(sizeof(EFI_IP4_CONFIG2_MANUAL_ADDRESS));
+    if (Ip4NvData->ManualAddress == NULL) {
+      if (DnsAddress != NULL) {
+        FreePool(DnsAddress);
+      }
+      
+      return EFI_OUT_OF_RESOURCES;
+    }
+    CopyMem(&Ip4NvData->ManualAddress->Address, &StationAddress.v4, 
sizeof(EFI_IPv4_ADDRESS));
+    CopyMem(&Ip4NvData->ManualAddress->SubnetMask, &SubnetMask.v4, 
sizeof(EFI_IPv4_ADDRESS));
+    
+    if (Ip4NvData->GatewayAddress != NULL) {
+      FreePool(Ip4NvData->GatewayAddress); 
+    }
+    Ip4NvData->GatewayAddressCount = 1;
+    Ip4NvData->GatewayAddress = AllocateZeroPool(sizeof(EFI_IPv4_ADDRESS));
+    if (Ip4NvData->GatewayAddress == NULL) {
+      if (DnsAddress != NULL) {
+        FreePool(DnsAddress);
+      }
+      return EFI_OUT_OF_RESOURCES;
+    }
+    CopyMem(Ip4NvData->GatewayAddress, &Gateway.v4, sizeof(EFI_IPv4_ADDRESS));
+    
+    if (Ip4NvData->DnsAddress != NULL) {
+      FreePool(Ip4NvData->DnsAddress); 
+    }
+    Ip4NvData->DnsAddressCount = (UINT32) DnsCount;
+    Ip4NvData->DnsAddress      = DnsAddress;
+
+    //
+    // Setting Ip4NvData.
+    //
+    Status = Ip4Cfg2->SetData (
+                        Ip4Cfg2,
+                        Ip4Config2DataTypePolicy,
+                        sizeof (EFI_IP4_CONFIG2_POLICY),
+                        &Ip4NvData->Policy
+                        );
+    if (EFI_ERROR(Status)) {
+      return Status;
+    }
+
+    //
+    // Create events & timers for asynchronous settings.
+    //
+    Status = gBS->CreateEvent (
+                    EVT_TIMER,
+                    TPL_CALLBACK,
+                    NULL,
+                    NULL,
+                    &TimeoutEvent
+                    );
+    if (EFI_ERROR (Status)) {
+      return EFI_OUT_OF_RESOURCES;
+    }
+
+    Status = gBS->CreateEvent (
+                    EVT_NOTIFY_SIGNAL,
+                    TPL_NOTIFY,
+                    Ip4Config2ManualAddressNotify,
+                    &IsAddressOk,
+                    &SetAddressEvent
+                    );
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    IsAddressOk = FALSE;
+    
+    Status = Ip4Cfg2->RegisterDataNotify (
+                        Ip4Cfg2,
+                        Ip4Config2DataTypeManualAddress,
+                        SetAddressEvent
+                        );
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    //
+    // Set ManualAddress.
+    //
+    DataSize = Ip4NvData->ManualAddressCount * sizeof 
(EFI_IP4_CONFIG2_MANUAL_ADDRESS);
+    Status = Ip4Cfg2->SetData (
+                        Ip4Cfg2,
+                        Ip4Config2DataTypeManualAddress,
+                        DataSize,
+                        (VOID *) Ip4NvData->ManualAddress
+                        );
+
+    if (Status == EFI_NOT_READY) {
+      gBS->SetTimer (TimeoutEvent, TimerRelative, 50000000);
+      while (EFI_ERROR (gBS->CheckEvent (TimeoutEvent))) {
+        if (IsAddressOk) {
+          Status = EFI_SUCCESS;
+          break;
+        }
+      }
+    }
+
+    Ip4Cfg2->UnregisterDataNotify (
+               Ip4Cfg2,
+               Ip4Config2DataTypeManualAddress,
+               SetAddressEvent
+               );
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    //
+    // Set gateway.
+    //
+    DataSize = Ip4NvData->GatewayAddressCount * sizeof (EFI_IPv4_ADDRESS);
+    Status = Ip4Cfg2->SetData (
+                        Ip4Cfg2,
+                        Ip4Config2DataTypeGateway,
+                        DataSize,
+                        Ip4NvData->GatewayAddress
+                        );
+    if (EFI_ERROR (Status)) {
+      goto Exit;
+    }
+
+    //
+    // Set DNS addresses.
+    //
+    if (Ip4NvData->DnsAddressCount > 0 && Ip4NvData->DnsAddress != NULL) {
+      DataSize = Ip4NvData->DnsAddressCount * sizeof (EFI_IPv4_ADDRESS);
+      Status = Ip4Cfg2->SetData (
+                          Ip4Cfg2,
+                          Ip4Config2DataTypeDnsServer,
+                          DataSize,
+                          Ip4NvData->DnsAddress
+                          );
+      
+      if (EFI_ERROR (Status)) {
+        goto Exit;
+      } 
+    } 
+  } 
+
+Exit:
+  if (SetAddressEvent != NULL) {
+    gBS->CloseEvent (SetAddressEvent);
+  }
+
+  if (TimeoutEvent != NULL) {
+    gBS->CloseEvent (TimeoutEvent);
+  }
+
+  return Status;
+}
+
+/**
+  This function allows the caller to request the current
+  configuration for one or more named elements. The resulting
+  string is in <ConfigAltResp> format. Any and all alternative
+  configuration strings shall also be appended to the end of the
+  current configuration string. If they are, they must appear
+  after the current configuration. They must contain the same
+  routing (GUID, NAME, PATH) as the current configuration string.
+  They must have an additional description indicating the type of
+  alternative configuration the string represents,
+  "ALTCFG=<StringToken>". That <StringToken> (when
+  converted from Hex UNICODE to binary) is a reference to a
+  string in the associated string pack.
+
+  @param[in] This       Points to the EFI_HII_CONFIG_ACCESS_PROTOCOL.
+  @param[in] Request    A null-terminated Unicode string in
+                        <ConfigRequest> format. Note that this
+                        includes the routing information as well as
+                        the configurable name / value pairs. It is
+                        invalid for this string to be in
+                        <MultiConfigRequest> format.
+  @param[out] Progress  On return, points to a character in the
+                        Request string. Points to the string's null
+                        terminator if request was successful. Points
+                        to the most recent "&" before the first
+                        failing name / value pair (or the beginning
+                        of the string if the failure is in the first
+                        name / value pair) if the request was not
+                        successful.
+  @param[out] Results   A null-terminated Unicode string in
+                        <ConfigAltResp> format which has all values
+                        filled in for the names in the Request string.
+                        String to be allocated by the called function.
+
+  @retval EFI_SUCCESS             The Results string is filled with the
+                                  values corresponding to all requested
+                                  names.
+  @retval EFI_OUT_OF_RESOURCES    Not enough memory to store the
+                                  parts of the results that must be
+                                  stored awaiting possible future
+                                  protocols.
+  @retval EFI_NOT_FOUND           Routing data doesn't match any
+                                  known driver. Progress set to the
+                                  first character in the routing header.
+                                  Note: There is no requirement that the
+                                  driver validate the routing data. It
+                                  must skip the <ConfigHdr> in order to
+                                  process the names.
+  @retval EFI_INVALID_PARAMETER   Illegal syntax. Progress set
+                                  to most recent & before the
+                                  error or the beginning of the
+                                  string.
+  @retval EFI_INVALID_PARAMETER   Unknown name. Progress points
+                                  to the & before the name in
+                                  question.Currently not implemented.
+**/
+EFI_STATUS
+EFIAPI
+Ip4FormExtractConfig (
+  IN  CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
+  IN  CONST EFI_STRING                       Request,
+  OUT EFI_STRING                             *Progress,
+  OUT EFI_STRING                             *Results
+  )
+{
+  EFI_STATUS                       Status;  
+  IP4_CONFIG2_INSTANCE             *Ip4Config2Instance;
+  IP4_FORM_CALLBACK_INFO           *Private;  
+  IP4_CONFIG2_IFR_NVDATA           *IfrFormNvData;
+  EFI_STRING                       ConfigRequestHdr;
+  EFI_STRING                       ConfigRequest;  
+  BOOLEAN                          AllocatedRequest;
+  EFI_STRING                       FormResult;
+  UINTN                            Size;
+  UINTN                            BufferSize;
+  
+  Status             = EFI_SUCCESS; 
+  IfrFormNvData      = NULL;
+  ConfigRequest      = NULL;
+  FormResult         = NULL; 
+  Size               = 0;
+  AllocatedRequest   = FALSE;    
+  ConfigRequest      = Request; 
+  Private            = IP4_FORM_CALLBACK_INFO_FROM_CONFIG_ACCESS(This);
+  Ip4Config2Instance = IP4_CONFIG2_INSTANCE_FROM_FORM_CALLBACK(Private);
+  BufferSize         = sizeof (IP4_CONFIG2_IFR_NVDATA);
+  *Progress          = Request;
+  
+  if (Progress == NULL || Results == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+  
+  //
+  // Check Request data in <ConfigHdr>.
+  //

@@ Diff output truncated at 100000 characters. @@

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