Import Ip4Config module

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3406 6f19259b-4bc3-4df7-8a09-765794883524

8 files changed, 2172 insertions, 0 deletions

diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/ComponentName.c b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/ComponentName.c
new file mode 100644
index 0000000..1be21a1
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/ComponentName.c
@@ -0,0 +1,157 @@
+/** @file

+

+Copyright (c) 2006 - 2007, Intel Corporation

+All rights reserved. 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.

+

+Module Name:

+

+  ComponentName.c

+

+Abstract:

+

+

+**/

+

+

+#include "Ip4Config.h"

+

+//

+// EFI Component Name Functions

+//

+EFI_STATUS

+EFIAPI

+Ip4ConfigComponentNameGetDriverName (

+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,

+  IN  CHAR8                        *Language,

+  OUT CHAR16                       **DriverName

+  );

+

+EFI_STATUS

+EFIAPI

+Ip4ConfigComponentNameGetControllerName (

+  IN  EFI_COMPONENT_NAME_PROTOCOL                     *This,

+  IN  EFI_HANDLE                                      ControllerHandle,

+  IN  EFI_HANDLE                                      ChildHandle        OPTIONAL,

+  IN  CHAR8                                           *Language,

+  OUT CHAR16                                          **ControllerName

+  );

+

+//

+// EFI Component Name Protocol

+//

+EFI_COMPONENT_NAME_PROTOCOL     gIp4ConfigComponentName = {

+  Ip4ConfigComponentNameGetDriverName,

+  Ip4ConfigComponentNameGetControllerName,

+  "eng"

+};

+

+STATIC

+EFI_UNICODE_STRING_TABLE mIp4ConfigDriverNameTable[] = {

+  {"eng", L"IP4 CONFIG Network Service Driver"},

+  {NULL, NULL}

+};

+

+EFI_STATUS

+EFIAPI

+Ip4ConfigComponentNameGetDriverName (

+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,

+  IN  CHAR8                        *Language,

+  OUT CHAR16                       **DriverName

+  )

+/*++

+

+  Routine Description:

+    Retrieves a Unicode string that is the user readable name of the EFI Driver.

+

+  Arguments:

+    This       - A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.

+    Language   - A pointer to a three character ISO 639-2 language identifier.

+                 This is the language of the driver name that that the caller

+                 is requesting, and it must match one of the languages specified

+                 in SupportedLanguages.  The number of languages supported by a

+                 driver is up to the driver writer.

+    DriverName - A pointer to the Unicode string to return.  This Unicode string

+                 is the name of the driver specified by This in the language

+                 specified by Language.

+

+  Returns:

+    EFI_SUCCES            - The Unicode string for the Driver specified by This

+                            and the language specified by Language was returned

+                            in DriverName.

+    EFI_INVALID_PARAMETER - Language is NULL.

+    EFI_INVALID_PARAMETER - DriverName is NULL.

+    EFI_UNSUPPORTED       - The driver specified by This does not support the

+                            language specified by Language.

+

+--*/

+{

+  return LookupUnicodeString (

+           Language,

+           gIp4ConfigComponentName.SupportedLanguages,

+           mIp4ConfigDriverNameTable,

+           DriverName

+           );

+}

+

+EFI_STATUS

+EFIAPI

+Ip4ConfigComponentNameGetControllerName (

+  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,

+  IN  EFI_HANDLE                   ControllerHandle,

+  IN  EFI_HANDLE                   ChildHandle        OPTIONAL,

+  IN  CHAR8                        *Language,

+  OUT CHAR16                       **ControllerName

+  )

+/*++

+

+  Routine Description:

+    Retrieves a Unicode string that is the user readable name of the controller

+    that is being managed by an EFI Driver.

+

+  Arguments:

+    This             - A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.

+    ControllerHandle - The handle of a controller that the driver specified by

+                       This is managing.  This handle specifies the controller

+                       whose name is to be returned.

+    ChildHandle      - The handle of the child controller to retrieve the name

+                       of.  This is an optional parameter that may be NULL.  It

+                       will be NULL for device drivers.  It will also be NULL

+                       for a bus drivers that wish to retrieve the name of the

+                       bus controller.  It will not be NULL for a bus driver

+                       that wishes to retrieve the name of a child controller.

+    Language         - A pointer to a three character ISO 639-2 language

+                       identifier.  This is the language of the controller name

+                       that that the caller is requesting, and it must match one

+                       of the languages specified in SupportedLanguages.  The

+                       number of languages supported by a driver is up to the

+                       driver writer.

+    ControllerName   - A pointer to the Unicode string to return.  This Unicode

+                       string is the name of the controller specified by

+                       ControllerHandle and ChildHandle in the language specified

+                       by Language from the point of view of the driver specified

+                       by This.

+

+  Returns:

+    EFI_SUCCESS           - The Unicode string for the user readable name in the

+                            language specified by Language for the driver

+                            specified by This was returned in DriverName.

+    EFI_INVALID_PARAMETER - ControllerHandle is not a valid EFI_HANDLE.

+    EFI_INVALID_PARAMETER - ChildHandle is not NULL and it is not a valid EFI_HANDLE.

+    EFI_INVALID_PARAMETER - Language is NULL.

+    EFI_INVALID_PARAMETER - ControllerName is NULL.

+    EFI_UNSUPPORTED       - The driver specified by This is not currently managing

+                            the controller specified by ControllerHandle and

+                            ChildHandle.

+    EFI_UNSUPPORTED       - The driver specified by This does not support the

+                            language specified by Language.

+

+--*/

+{

+  return EFI_UNSUPPORTED;

+}

diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.c b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.c
new file mode 100644
index 0000000..c0cc15f
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.c
@@ -0,0 +1,755 @@
+/** @file

+

+Copyright (c) 2006 - 2007, Intel Corporation

+All rights reserved. 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.

+

+Module Name:

+

+  Ip4Config.c

+

+Abstract:

+

+  This code implements the IP4Config and NicIp4Config protocols.

+

+

+**/

+

+#include "Ip4Config.h"

+

+IP4_CONFIG_INSTANCE *mIp4ConfigNicList[MAX_IP4_CONFIG_IN_VARIABLE];

+

+VOID

+EFIAPI

+Ip4ConfigOnDhcp4Complete (

+  IN EFI_EVENT                  Event,

+  IN VOID                       *Context

+  );

+

+

+/**

+  Return the name and MAC address for the NIC. The Name, if not NULL,

+  has at least IP4_NIC_NAME_LENGTH bytes.

+

+  @param  This                   The NIC IP4 CONFIG protocol

+  @param  Name                   The buffer to return the name

+  @param  NicAddr                The buffer to return the MAC addr

+

+  @retval EFI_INVALID_PARAMETER  This is NULL

+  @retval EFI_SUCCESS            The name or address of the NIC are returned.

+

+**/

+STATIC

+EFI_STATUS

+EFIAPI

+EfiNicIp4ConfigGetName (

+  IN  EFI_NIC_IP4_CONFIG_PROTOCOL *This,

+  IN  UINT16                      *Name,          OPTIONAL

+  IN  NIC_ADDR                    *NicAddr       OPTIONAL

+  )

+{

+  IP4_CONFIG_INSTANCE       *Instance;

+

+  if (This == NULL) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  Instance = IP4_CONFIG_INSTANCE_FROM_NIC_IP4CONFIG (This);

+

+  if (Name != NULL) {

+    NetCopyMem (Name, Instance->NicName, IP4_NIC_NAME_LENGTH);

+  }

+

+  if (NicAddr != NULL) {

+    *NicAddr = Instance->NicAddr;

+  }

+

+  return EFI_SUCCESS;

+}

+

+

+/**

+  Get the NIC's configure information from the IP4 configure  variable.

+  It will remove the invalid variable.

+

+  @param  NicAddr                The NIC to check

+

+  @return NULL if no configure for the NIC in the variable, or it is invalid.

+  @return Otherwise the NIC's IP configure parameter.

+

+**/

+NIC_IP4_CONFIG_INFO *

+Ip4ConfigGetNicInfo (

+  IN  NIC_ADDR              *NicAddr

+  )

+{

+  IP4_CONFIG_VARIABLE       *Variable;

+  IP4_CONFIG_VARIABLE       *NewVariable;

+  NIC_IP4_CONFIG_INFO       *Config;

+

+  //

+  // Read the configuration parameter for this NicAddr from

+  // the EFI variable

+  //

+  Variable = Ip4ConfigReadVariable ();

+

+  if (Variable == NULL) {

+    return NULL;

+  }

+

+  Config = Ip4ConfigFindNicVariable (Variable, NicAddr);

+

+  if (Config == NULL) {

+    NetFreePool (Variable);

+    return NULL;

+  }

+

+  //

+  // Validate the configuration, if the configuration is invalid,

+  // remove it from the variable.

+  //

+  if (!Ip4ConfigIsValid (Config)) {

+    NewVariable = Ip4ConfigModifyVariable (Variable, &Config->NicAddr, NULL);

+    Ip4ConfigWriteVariable (NewVariable);

+

+    if (NewVariable != NULL) {

+      NetFreePool (NewVariable);

+    };

+

+    NetFreePool (Config);

+    Config = NULL;

+  }

+

+  NetFreePool (Variable);

+  return Config;

+}

+

+

+/**

+  Get the configure parameter for this NIC.

+

+  @param  This                   The NIC IP4 CONFIG protocol

+  @param  ConfigLen              The length of the NicConfig buffer.

+  @param  NicConfig              The buffer to receive the NIC's configure

+                                 parameter.

+

+  @retval EFI_INVALID_PARAMETER  This or ConfigLen is NULL

+  @retval EFI_NOT_FOUND          There is no configure parameter for the NIC in

+                                 NVRam.

+

+**/

+EFI_STATUS

+EFIAPI

+EfiNicIp4ConfigGetInfo (

+  IN  EFI_NIC_IP4_CONFIG_PROTOCOL *This,

+  IN OUT  UINTN                   *ConfigLen,

+  OUT NIC_IP4_CONFIG_INFO         *NicConfig

+  )

+{

+  IP4_CONFIG_INSTANCE *Instance;

+  NIC_IP4_CONFIG_INFO *Config;

+  EFI_STATUS          Status;

+  UINTN               Len;

+

+  if ((This == NULL) || (ConfigLen == NULL)) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  //

+  // Read the Nic's configuration parameter from variable

+  //

+  Instance  = IP4_CONFIG_INSTANCE_FROM_NIC_IP4CONFIG (This);

+  Config    = Ip4ConfigGetNicInfo (&Instance->NicAddr);

+

+  if (Config == NULL) {

+    return EFI_NOT_FOUND;

+  }

+

+  //

+  // Copy the data to user's buffer

+  //

+  Len = SIZEOF_NIC_IP4_CONFIG_INFO (Config);

+

+  if ((*ConfigLen < Len) || (NicConfig == NULL)) {

+    Status = EFI_BUFFER_TOO_SMALL;

+  } else {

+    Status = EFI_SUCCESS;

+    NetCopyMem (NicConfig, Config, Len);

+  }

+

+  *ConfigLen = Len;

+

+  NetFreePool (Config);

+  return Status;

+}

+

+

+/**

+  Set the IP configure parameters for this NIC. If Reconfig is TRUE,

+  the IP driver will be informed to discard current auto configure

+  parameter and restart the auto configuration process. If current

+  there is a pending auto configuration, EFI_ALREADY_STARTED is

+  returned. You can only change the configure setting when either

+  the configure has finished or not started yet. If NicConfig, the

+  NIC's configure parameter is removed from the variable.

+

+  @param  This                   The NIC IP4 CONFIG protocol

+  @param  NicConfig              The new NIC IP4 configure parameter

+  @param  Reconfig               Inform the IP4 driver to restart the auto

+                                 configuration

+

+  @retval EFI_INVALID_PARAMETER  This is NULL or the configure parameter is

+                                 invalid.

+  @retval EFI_ALREADY_STARTED    There is a pending auto configuration.

+  @retval EFI_NOT_FOUND          No auto configure parameter is found

+

+**/

+EFI_STATUS

+EFIAPI

+EfiNicIp4ConfigSetInfo (

+  IN EFI_NIC_IP4_CONFIG_PROTOCOL  *This,

+  IN NIC_IP4_CONFIG_INFO          *NicConfig,     OPTIONAL

+  IN BOOLEAN                      Reconfig

+  )

+{

+  IP4_CONFIG_INSTANCE *Instance;

+  IP4_CONFIG_VARIABLE *Variable;

+  IP4_CONFIG_VARIABLE *NewVariable;

+  EFI_STATUS          Status;

+

+  //

+  // Validate the parameters

+  //

+  if (This == NULL) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  Instance = IP4_CONFIG_INSTANCE_FROM_NIC_IP4CONFIG (This);

+

+  if ((NicConfig != NULL) && (!Ip4ConfigIsValid (NicConfig) ||

+      !NIC_ADDR_EQUAL (&NicConfig->NicAddr, &Instance->NicAddr))) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  if (Instance->State == IP4_CONFIG_STATE_STARTED) {

+    return EFI_ALREADY_STARTED;

+  }

+

+  //

+  // Update the parameter in the configure variable

+  //

+  Variable = Ip4ConfigReadVariable ();

+

+  if ((Variable == NULL) && (NicConfig == NULL)) {

+    return EFI_NOT_FOUND;

+  }

+

+  NewVariable = Ip4ConfigModifyVariable (Variable, &Instance->NicAddr, NicConfig);

+  Status      = Ip4ConfigWriteVariable (NewVariable);

+

+  if (NewVariable != NULL) {

+    NetFreePool (NewVariable);

+  }

+

+  //

+  // Variable is NULL when saving the first configure parameter

+  //

+  if (Variable != NULL) {

+    NetFreePool (Variable);

+  }

+

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  //

+  // Signal the IP4 to run the auto configuration again

+  //

+  if (Reconfig && (Instance->ReconfigEvent != NULL)) {

+    Status = gBS->SignalEvent (Instance->ReconfigEvent);

+  }

+

+  return Status;

+}

+

+

+/**

+  Start the auto configuration process.

+

+  @param  This                   The IP4 configure protocol

+  @param  DoneEvent              The event to signal when auto configure is done

+  @param  ReconfigEvent          The event to signal when reconfigure is necessary.

+

+  @retval EFI_INVALID_PARAMETER  One of the function parameters is NULL.

+  @retval EFI_ALREADY_STARTED    The auto configuration has already started.

+  @retval EFI_SUCCESS            The auto configure is successfully started.

+

+**/

+EFI_STATUS

+EFIAPI

+EfiIp4ConfigStart (

+  IN EFI_IP4_CONFIG_PROTOCOL  *This,

+  IN EFI_EVENT                DoneEvent,

+  IN EFI_EVENT                ReconfigEvent

+  )

+{

+  IP4_CONFIG_INSTANCE       *Instance;

+  EFI_DHCP4_PROTOCOL        *Dhcp4;

+  EFI_DHCP4_MODE_DATA       Dhcp4Mode;

+  EFI_DHCP4_PACKET_OPTION   *OptionList[1];

+  IP4_CONFIG_DHCP4_OPTION   ParaList;

+  EFI_STATUS                Status;

+  UINT32                    Source;

+  EFI_TPL                   OldTpl;

+

+  if ((This == NULL) || (DoneEvent == NULL) || (ReconfigEvent == NULL)) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  Instance = IP4_CONFIG_INSTANCE_FROM_IP4CONFIG (This);

+

+  OldTpl = NET_RAISE_TPL (NET_TPL_LOCK);

+

+  if (Instance->State != IP4_CONFIG_STATE_IDLE) {

+    Status = EFI_ALREADY_STARTED;

+

+    goto ON_EXIT;

+  }

+

+  Instance->DoneEvent     = DoneEvent;

+  Instance->ReconfigEvent = ReconfigEvent;

+

+  Instance->NicConfig     = Ip4ConfigGetNicInfo (&Instance->NicAddr);

+

+  if (Instance->NicConfig == NULL) {

+    Source = IP4_CONFIG_SOURCE_DHCP;

+  } else {

+    Source = Instance->NicConfig->Source;

+  }

+

+  //

+  // If the source is static, the auto configuration is done.

+  // return now.

+  //

+  if (Source == IP4_CONFIG_SOURCE_STATIC) {

+    Instance->State  = IP4_CONFIG_STATE_CONFIGURED;

+    Instance->Result = EFI_SUCCESS;

+

+    gBS->SignalEvent (Instance->DoneEvent);

+    Status = EFI_SUCCESS;

+    goto ON_EXIT;

+  }

+

+  //

+  // Start the dhcp process

+  //

+  ASSERT ((Source == IP4_CONFIG_SOURCE_DHCP) && (Instance->Dhcp4 == NULL));

+

+  Status = NetLibCreateServiceChild (

+             Instance->Controller,

+             Instance->Image,

+             &gEfiDhcp4ServiceBindingProtocolGuid,

+             &Instance->Dhcp4Handle

+             );

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  Status = gBS->OpenProtocol (

+                  Instance->Dhcp4Handle,

+                  &gEfiDhcp4ProtocolGuid,

+                  (VOID **) &Instance->Dhcp4,

+                  Instance->Image,

+                  Instance->Controller,

+                  EFI_OPEN_PROTOCOL_BY_DRIVER

+                  );

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  //

+  // Check the current DHCP status, if the DHCP process has

+  // already finished, return now.

+  //

+  Dhcp4  = Instance->Dhcp4;

+  Status = Dhcp4->GetModeData (Dhcp4, &Dhcp4Mode);

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  if (Dhcp4Mode.State == Dhcp4Bound) {

+    Ip4ConfigOnDhcp4Complete (NULL, Instance);

+

+    goto ON_EXIT;

+  }

+

+  //

+  // 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)) {

+    goto ON_ERROR;

+  }

+

+  //

+  // Start the DHCP process

+  //

+  Status = gBS->CreateEvent (

+                  EVT_NOTIFY_SIGNAL,

+                  NET_TPL_EVENT,

+                  Ip4ConfigOnDhcp4Complete,

+                  Instance,

+                  &Instance->Dhcp4Event

+                  );

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  Status = Dhcp4->Start (Dhcp4, Instance->Dhcp4Event);

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  Instance->State  = IP4_CONFIG_STATE_STARTED;

+  Instance->Result = EFI_NOT_READY;

+

+ON_ERROR:

+  if (EFI_ERROR (Status)) {

+    Ip4ConfigCleanConfig (Instance);

+  }

+

+ON_EXIT:

+  NET_RESTORE_TPL (OldTpl);

+

+  return Status;

+}

+

+

+/**

+  Stop the current auto configuration

+

+  @param  This                   The IP4 CONFIG protocol

+

+  @retval EFI_INVALID_PARAMETER  This is NULL.

+  @retval EFI_NOT_STARTED        The auto configuration hasn't been started.

+  @retval EFI_SUCCESS            The auto configuration has been stopped.

+

+**/

+EFI_STATUS

+EFIAPI

+EfiIp4ConfigStop (

+  IN EFI_IP4_CONFIG_PROTOCOL  *This

+  )

+{

+  IP4_CONFIG_INSTANCE  *Instance;

+  EFI_STATUS           Status;

+  EFI_TPL              OldTpl;

+

+  if (This == NULL) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  Instance = IP4_CONFIG_INSTANCE_FROM_IP4CONFIG (This);

+

+  Status = EFI_SUCCESS;

+  OldTpl = NET_RAISE_TPL (NET_TPL_LOCK);

+

+  if (Instance->State == IP4_CONFIG_STATE_IDLE) {

+    Status = EFI_NOT_STARTED;

+    goto ON_EXIT;

+  }

+

+  //

+  // Release all the configure parameters. Don't signal the user

+  // event. The user wants to abort the configuration, this isn't

+  // the configuration done or reconfiguration.

+  //

+  Ip4ConfigCleanConfig (Instance);

+

+ON_EXIT:

+  NET_RESTORE_TPL (OldTpl);

+

+  return Status;

+}

+

+

+/**

+  Get the current outcome of the auto configuration process

+

+  @param  This                   The IP4 CONFIG protocol

+  @param  ConfigDataSize         The size of the configure data

+  @param  ConfigData             The buffer to save the configure data

+

+  @retval EFI_INVALID_PARAMETER  This or ConfigDataSize is NULL

+  @retval EFI_BUFFER_TOO_SMALL   The buffer is too small. The needed size is

+                                 returned in the ConfigDataSize.

+  @retval EFI_SUCCESS            The configure data is put in the buffer

+

+**/

+EFI_STATUS

+EFIAPI

+EfiIp4ConfigGetData (

+  IN  EFI_IP4_CONFIG_PROTOCOL *This,

+  IN  OUT  UINTN              *ConfigDataSize,

+  OUT EFI_IP4_IPCONFIG_DATA   *ConfigData           OPTIONAL

+  )

+{

+  IP4_CONFIG_INSTANCE       *Instance;

+  NIC_IP4_CONFIG_INFO       *NicConfig;

+  EFI_STATUS                Status;

+  EFI_TPL                   OldTpl;

+  UINTN                     Len;

+

+  if ((This == NULL) || (ConfigDataSize == NULL)) {

+    return EFI_INVALID_PARAMETER;

+  }

+

+  Instance  = IP4_CONFIG_INSTANCE_FROM_IP4CONFIG (This);

+

+  Status = EFI_SUCCESS;

+  OldTpl = NET_RAISE_TPL (NET_TPL_LOCK);

+

+  if (Instance->State == IP4_CONFIG_STATE_IDLE) {

+    Status = EFI_NOT_STARTED;

+  } else if (Instance->State == IP4_CONFIG_STATE_STARTED) {

+    Status = EFI_NOT_READY;

+  }

+

+  if (EFI_ERROR (Status)) {

+    goto ON_EXIT;

+  }

+

+  //

+  // Copy the configure data if auto configuration succeeds.

+  //

+  Status = Instance->Result;

+

+  if (Status == EFI_SUCCESS) {

+    ASSERT (Instance->NicConfig != NULL);

+

+    NicConfig = Instance->NicConfig;

+    Len       = SIZEOF_IP4_CONFIG_INFO (&NicConfig->Ip4Info);

+

+    if ((*ConfigDataSize < Len) || (ConfigData == NULL)) {

+      Status = EFI_BUFFER_TOO_SMALL;

+    } else {

+      NetCopyMem (ConfigData, &NicConfig->Ip4Info, Len);

+    }

+

+    *ConfigDataSize = Len;

+  }

+

+ON_EXIT:

+  NET_RESTORE_TPL (OldTpl);

+

+  return Status;

+}

+

+

+/**

+  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

+Ip4ConfigOnDhcp4Complete (

+  IN EFI_EVENT              Event,

+  IN VOID                   *Context

+  )

+{

+  IP4_CONFIG_INSTANCE       *Instance;

+  EFI_DHCP4_MODE_DATA       Dhcp4Mode;

+  EFI_IP4_IPCONFIG_DATA     *Ip4Config;

+  EFI_STATUS                Status;

+  BOOLEAN                   Perment;

+  IP4_ADDR                  Subnet;

+

+  Instance = (IP4_CONFIG_INSTANCE *) Context;

+  ASSERT (Instance->Dhcp4 != NULL);

+

+  Instance->State   = IP4_CONFIG_STATE_CONFIGURED;

+  Instance->Result  = EFI_TIMEOUT;

+

+  //

+  // Get the DHCP retrieved parameters

+  //

+  Status = Instance->Dhcp4->GetModeData (Instance->Dhcp4, &Dhcp4Mode);

+

+  if (EFI_ERROR (Status)) {

+    goto ON_EXIT;

+  }

+

+  if (Dhcp4Mode.State == Dhcp4Bound) {

+    //

+    // Save the new configuration retrieved by DHCP both in

+    // the instance and to NVRam. So, both the IP4 driver and

+    // other user can get that address.

+    //

+    Perment = FALSE;

+

+    if (Instance->NicConfig != NULL) {

+      ASSERT (Instance->NicConfig->Source == IP4_CONFIG_SOURCE_DHCP);

+      Perment = Instance->NicConfig->Perment;

+      NetFreePool (Instance->NicConfig);

+    }

+

+    Instance->NicConfig = NetAllocatePool (sizeof (NIC_IP4_CONFIG_INFO) +

+                                           sizeof (EFI_IP4_ROUTE_TABLE));

+

+    if (Instance->NicConfig == NULL) {

+      Instance->Result = EFI_OUT_OF_RESOURCES;

+      goto ON_EXIT;

+    }

+

+    Instance->NicConfig->NicAddr = Instance->NicAddr;

+    Instance->NicConfig->Source  = IP4_CONFIG_SOURCE_DHCP;

+    Instance->NicConfig->Perment = Perment;

+

+    Ip4Config                    = &Instance->NicConfig->Ip4Info;

+    Ip4Config->StationAddress    = Dhcp4Mode.ClientAddress;

+    Ip4Config->SubnetMask        = Dhcp4Mode.SubnetMask;

+

+    //

+    // Create a route for the connected network

+    //

+    Ip4Config->RouteTableSize    = 1;

+

+    Subnet = EFI_NTOHL (Dhcp4Mode.ClientAddress) & EFI_NTOHL (Dhcp4Mode.SubnetMask);

+

+    EFI_IP4 (Ip4Config->RouteTable[0].SubnetAddress)  = HTONL (Subnet);

+    Ip4Config->RouteTable[0].SubnetMask               = Dhcp4Mode.SubnetMask;

+    EFI_IP4 (Ip4Config->RouteTable[0].GatewayAddress) = 0;

+

+    //

+    // Create a route if there is a default router.

+    //

+    if (EFI_IP4 (Dhcp4Mode.RouterAddress) != 0) {

+      Ip4Config->RouteTableSize                         = 2;

+      EFI_IP4 (Ip4Config->RouteTable[1].SubnetAddress)  = 0;

+      EFI_IP4 (Ip4Config->RouteTable[1].SubnetMask)     = 0;

+      Ip4Config->RouteTable[1].GatewayAddress           = Dhcp4Mode.RouterAddress;

+    }

+

+    Instance->Result = EFI_SUCCESS;

+

+    //

+    // ignore the return status of EfiNicIp4ConfigSetInfo. Network

+    // stack can operate even that failed.

+    //

+    EfiNicIp4ConfigSetInfo (&Instance->NicIp4Protocol, Instance->NicConfig, FALSE);

+  }

+

+ON_EXIT:

+  gBS->SignalEvent (Instance->DoneEvent);

+  Ip4ConfigCleanDhcp4 (Instance);

+  return ;

+}

+

+

+/**

+  Release all the DHCP related resources.

+

+  @param  This                   The IP4 configure instance

+

+  @return None

+

+**/

+VOID

+Ip4ConfigCleanDhcp4 (

+  IN IP4_CONFIG_INSTANCE    *This

+  )

+{

+  if (This->Dhcp4 != NULL) {

+    This->Dhcp4->Stop (This->Dhcp4);

+

+    gBS->CloseProtocol (

+          This->Dhcp4Handle,

+          &gEfiDhcp4ProtocolGuid,

+          This->Image,

+          This->Controller

+          );

+

+    This->Dhcp4 = NULL;

+  }

+

+  if (This->Dhcp4Handle != NULL) {

+    NetLibDestroyServiceChild (

+      This->Controller,

+      This->Image,

+      &gEfiDhcp4ServiceBindingProtocolGuid,

+      This->Dhcp4Handle

+      );

+

+    This->Dhcp4Handle = NULL;

+  }

+

+  if (This->Dhcp4Event == NULL) {

+    gBS->CloseEvent (This->Dhcp4Event);

+    This->Dhcp4Event = NULL;

+  }

+}

+

+

+/**

+  Clean up all the configuration parameters

+

+  @param  Instance               The IP4 configure instance

+

+  @return None

+

+**/

+VOID

+Ip4ConfigCleanConfig (

+  IN IP4_CONFIG_INSTANCE        *Instance

+  )

+{

+  if (Instance->NicConfig != NULL) {

+    NetFreePool (Instance->NicConfig);

+    Instance->NicConfig = NULL;

+  }

+

+  Instance->State         = IP4_CONFIG_STATE_IDLE;

+  Instance->DoneEvent     = NULL;

+  Instance->ReconfigEvent = NULL;

+

+  Ip4ConfigCleanDhcp4 (Instance);

+}

+

+EFI_IP4_CONFIG_PROTOCOL     mIp4ConfigProtocolTemplate = {

+  EfiIp4ConfigStart,

+  EfiIp4ConfigStop,

+  EfiIp4ConfigGetData

+};

+

+EFI_NIC_IP4_CONFIG_PROTOCOL mNicIp4ConfigProtocolTemplate = {

+  EfiNicIp4ConfigGetName,

+  EfiNicIp4ConfigGetInfo,

+  EfiNicIp4ConfigSetInfo

+};

diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.h b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.h
new file mode 100644
index 0000000..90e5599
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4Config.h
@@ -0,0 +1,132 @@
+/** @file
+
+Copyright (c) 2006 - 2007, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+
+  Ip4Config.h
+
+Abstract:
+
+  Header file for IP4Config driver.
+
+
+**/
+
+#ifndef __EFI_IP4CONFIG_H__
+#define __EFI_IP4CONFIG_H__
+
+#include <PiDxe.h>

+

+#include <Protocol/Dhcp4.h>

+#include <Protocol/IP4Config.h>

+#include <Protocol/ManagedNetwork.h>

+

+#include <Library/DebugLib.h>

+#include <Library/UefiRuntimeServicesTableLib.h>

+#include <Library/UefiDriverEntryPoint.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/UefiLib.h>

+#include <Library/NetLib.h>

+#include <Library/BaseMemoryLib.h>

+#include <Library/MemoryAllocationLib.h>
+
+#include "NicIp4Variable.h"
+
+typedef struct _IP4_CONFIG_INSTANCE IP4_CONFIG_INSTANCE;
+
+enum {
+  IP4_CONFIG_STATE_IDLE         = 0,
+  IP4_CONFIG_STATE_STARTED,
+  IP4_CONFIG_STATE_CONFIGURED,
+
+  IP4_PROTO_ICMP                = 0x01,
+  IP4_CONFIG_INSTANCE_SIGNATURE = EFI_SIGNATURE_32 ('I', 'P', '4', 'C'),
+
+  DHCP_TAG_PARA_LIST            = 55,
+  DHCP_TAG_NETMASK              = 1,
+  DHCP_TAG_ROUTER               = 3,
+};
+
+//
+// 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_CONFIG_DHCP4_OPTION;
+#pragma pack()
+
+typedef struct _IP4_CONFIG_INSTANCE {
+  UINT32                        Signature;
+  EFI_HANDLE                    Controller;
+  EFI_HANDLE                    Image;
+
+  EFI_IP4_CONFIG_PROTOCOL       Ip4ConfigProtocol;
+  EFI_NIC_IP4_CONFIG_PROTOCOL   NicIp4Protocol;
+
+  //
+  // NicConfig's state, such as IP4_CONFIG_STATE_IDLE
+  //
+  INTN                          State;
+
+  //
+  // Mnp child to keep the connection with MNP.
+  //
+  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp;
+  EFI_HANDLE                    MnpHandle;
+
+  //
+  // User's requests data
+  //
+  EFI_EVENT                     DoneEvent;
+  EFI_EVENT                     ReconfigEvent;
+  EFI_STATUS                    Result;
+
+  //
+  // Identity of this interface and some configuration info.
+  //
+  NIC_ADDR                      NicAddr;
+  UINT16                        NicName[IP4_NIC_NAME_LENGTH];
+  UINT32                        NicIndex;
+  NIC_IP4_CONFIG_INFO           *NicConfig;
+
+  //
+  // DHCP handles to access DHCP
+  //
+  EFI_DHCP4_PROTOCOL            *Dhcp4;
+  EFI_HANDLE                    Dhcp4Handle;
+  EFI_EVENT                     Dhcp4Event;
+};
+
+#define IP4_CONFIG_INSTANCE_FROM_IP4CONFIG(this) \
+  CR (this, IP4_CONFIG_INSTANCE, Ip4ConfigProtocol, IP4_CONFIG_INSTANCE_SIGNATURE)
+
+#define IP4_CONFIG_INSTANCE_FROM_NIC_IP4CONFIG(this) \
+  CR (this, IP4_CONFIG_INSTANCE, NicIp4Protocol, IP4_CONFIG_INSTANCE_SIGNATURE)
+
+extern EFI_DRIVER_BINDING_PROTOCOL  gIp4ConfigDriverBinding;
+extern EFI_COMPONENT_NAME_PROTOCOL  gIp4ConfigComponentName;
+extern IP4_CONFIG_INSTANCE          *mIp4ConfigNicList[MAX_IP4_CONFIG_IN_VARIABLE];
+extern EFI_IP4_CONFIG_PROTOCOL      mIp4ConfigProtocolTemplate;
+extern EFI_NIC_IP4_CONFIG_PROTOCOL  mNicIp4ConfigProtocolTemplate;
+
+VOID
+Ip4ConfigCleanDhcp4 (
+  IN IP4_CONFIG_INSTANCE        *This
+  );
+
+VOID
+Ip4ConfigCleanConfig (
+  IN IP4_CONFIG_INSTANCE        *Instance
+  );
+#endif
diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDriver.c b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDriver.c
new file mode 100644
index 0000000..342b7d9
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDriver.c
@@ -0,0 +1,529 @@
+/** @file

+

+Copyright (c) 2006, Intel Corporation

+All rights reserved. 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.

+

+Module Name:

+

+  Ip4ConfigDriver.c

+

+Abstract:

+

+  The driver binding for IP4 CONFIG protocol.

+

+

+**/

+

+

+#include "Ip4Config.h"

+

+

+/**

+  Stop all the auto configuration when the IP4 configure driver is

+  being unloaded.

+

+  @param  ImageHandle          The driver that is being unloaded

+

+  @retval EFI_SUCCESS          The driver has been ready for unload.

+

+**/

+EFI_STATUS

+EFIAPI

+EfiIp4ConfigUnload (

+  IN EFI_HANDLE             ImageHandle

+  )

+{

+  UINT32      Index;

+

+  //

+  //  Stop all the IP4_CONFIG instances

+  //

+  for (Index = 0; Index < MAX_IP4_CONFIG_IN_VARIABLE; Index++) {

+    if (mIp4ConfigNicList[Index] == NULL) {

+      continue;

+    }

+

+    gIp4ConfigDriverBinding.Stop (

+                              &gIp4ConfigDriverBinding,

+                              mIp4ConfigNicList[Index]->MnpHandle,

+                              0,

+                              NULL

+                              );

+  }

+

+  return NetLibDefaultUnload (ImageHandle);

+}

+

+//@MT: EFI_DRIVER_ENTRY_POINT (Ip4ConfigDriverEntryPoint)

+

+EFI_STATUS

+Ip4ConfigDriverEntryPoint (

+  IN EFI_HANDLE             ImageHandle,

+  IN EFI_SYSTEM_TABLE       *SystemTable

+  )

+/*++

+

+Routine Description:

+

+  The entry point for IP4 config driver which install the driver

+  binding and component name protocol on its image.

+

+Arguments:

+

+  ImageHandle - The Image handle of the driver

+  SystemTable - The system table

+

+Returns:

+

+  EFI_SUCCESS - All the related protocols are installed on the driver

+  Others      - Failed to install the protocol

+

+--*/

+{

+  return NetLibInstallAllDriverProtocolsWithUnload (

+           ImageHandle,

+           SystemTable,

+           &gIp4ConfigDriverBinding,

+           ImageHandle,

+           &gIp4ConfigComponentName,

+           NULL,

+           NULL,

+           EfiIp4ConfigUnload

+           );

+}

+

+

+/**

+  Test to see if this driver supports ControllerHandle.

+

+  @param  This                 Protocol instance pointer.

+  @param  ControllerHandle     Handle of device to test

+  @param  RemainingDevicePath  Optional parameter use to pick a specific child

+                               device to start.

+

+  @retval EFI_SUCCES           This driver supports this device

+  @retval EFI_ALREADY_STARTED  This driver is already running on this device

+  @retval other                This driver does not support this device

+

+**/

+EFI_STATUS

+EFIAPI

+Ip4ConfigDriverBindingSupported (

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   ControllerHandle,

+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath  OPTIONAL

+  )

+{

+  EFI_STATUS  Status;

+

+  Status = gBS->OpenProtocol (

+                  ControllerHandle,

+                  &gEfiManagedNetworkServiceBindingProtocolGuid,

+                  NULL,

+                  This->DriverBindingHandle,

+                  ControllerHandle,

+                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL

+                  );

+

+  return Status;

+}

+

+

+/**

+  Start this driver on ControllerHandle.

+

+  @param  This                 Protocol instance pointer.

+  @param  ControllerHandle     Handle of device to bind driver to

+  @param  RemainingDevicePath  Optional parameter use to pick a specific child

+                               device to start.

+

+  @retval EFI_SUCCES           This driver is added to ControllerHandle

+  @retval EFI_ALREADY_STARTED  This driver is already running on ControllerHandle

+  @retval other                This driver does not support this device

+

+**/

+EFI_STATUS

+EFIAPI

+Ip4ConfigDriverBindingStart (

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   ControllerHandle,

+  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath OPTIONAL

+  )

+{

+  EFI_IP4_CONFIG_PROTOCOL       *Ip4Config;

+  EFI_MANAGED_NETWORK_PROTOCOL  *Mnp;

+  EFI_HANDLE                    MnpHandle;

+  IP4_CONFIG_INSTANCE           *Instance;

+  EFI_SIMPLE_NETWORK_MODE       SnpMode;

+  IP4_CONFIG_VARIABLE           *Variable;

+  NIC_IP4_CONFIG_INFO           *NicConfig;

+  IP4_CONFIG_VARIABLE           *NewVariable;

+  EFI_STATUS                    Status;

+  UINT32                        Index;

+

+  //

+  // Check for multiple start.

+  //

+  Status = gBS->OpenProtocol (

+                  ControllerHandle,

+                  &gEfiIp4ConfigProtocolGuid,

+                  &Ip4Config,

+                  This->DriverBindingHandle,

+                  ControllerHandle,

+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL

+                  );

+

+  if (!EFI_ERROR (Status)) {

+    return EFI_ALREADY_STARTED;

+  }

+

+  //

+  // Create a MNP child

+  //

+  Mnp       = NULL;

+  MnpHandle = NULL;

+  Instance  = NULL;

+

+  Status    = NetLibCreateServiceChild (

+                ControllerHandle,

+                This->DriverBindingHandle,

+                &gEfiManagedNetworkServiceBindingProtocolGuid,

+                &MnpHandle

+                );

+

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  Status = gBS->OpenProtocol (

+                  MnpHandle,

+                  &gEfiManagedNetworkProtocolGuid,

+                  (VOID **) &Mnp,

+                  This->DriverBindingHandle,

+                  ControllerHandle,

+                  EFI_OPEN_PROTOCOL_BY_DRIVER

+                  );

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  //

+  // Allocate an instance then initialize it

+  //

+  Instance = NetAllocatePool (sizeof (IP4_CONFIG_INSTANCE));

+

+  if (Instance == NULL) {

+    Status = EFI_OUT_OF_RESOURCES;

+    goto ON_ERROR;

+  }

+

+  Instance->Signature         = IP4_CONFIG_INSTANCE_SIGNATURE;

+  Instance->Controller        = ControllerHandle;

+  Instance->Image             = This->DriverBindingHandle;

+

+  Instance->Ip4ConfigProtocol = mIp4ConfigProtocolTemplate;

+  Instance->NicIp4Protocol    = mNicIp4ConfigProtocolTemplate;

+

+  Instance->State             = IP4_CONFIG_STATE_IDLE;

+  Instance->Mnp               = Mnp;

+  Instance->MnpHandle         = MnpHandle;

+

+  Instance->DoneEvent         = NULL;

+  Instance->ReconfigEvent     = NULL;

+  Instance->Result            = EFI_NOT_READY;

+  Instance->NicConfig         = NULL;

+

+  Instance->Dhcp4             = NULL;

+  Instance->Dhcp4Handle       = NULL;

+  Instance->Dhcp4Event        = NULL;

+

+  Status = Mnp->GetModeData (Mnp, NULL, &SnpMode);

+

+  if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {

+    goto ON_ERROR;

+  }

+

+  Instance->NicAddr.Type    = (UINT16) SnpMode.IfType;

+  Instance->NicAddr.Len     = (UINT8) SnpMode.HwAddressSize;

+  Instance->NicAddr.MacAddr = SnpMode.CurrentAddress;

+

+  //

+  // Add it to the global list, and compose the name

+  //

+  for (Index = 0; Index < MAX_IP4_CONFIG_IN_VARIABLE; Index++) {

+    if (mIp4ConfigNicList[Index] == NULL) {

+      mIp4ConfigNicList[Index]  = Instance;

+      Instance->NicIndex        = Index;

+

+      if (Instance->NicAddr.Type == NET_IFTYPE_ETHERNET) {

+        Instance->NicName[0]  = 'e';

+        Instance->NicName[1]  = 't';

+        Instance->NicName[2]  = 'h';

+        Instance->NicName[3]  = (UINT16) ('0' + Index);

+        Instance->NicName[4]  = 0;

+      } else {

+        Instance->NicName[0]  = 'u';

+        Instance->NicName[1]  = 'n';

+        Instance->NicName[2]  = 'k';

+        Instance->NicName[3]  = (UINT16) ('0' + Index);

+        Instance->NicName[4]  = 0;

+      }

+

+      break;

+    }

+  }

+

+  if (Index == MAX_IP4_CONFIG_IN_VARIABLE) {

+    Status = EFI_OUT_OF_RESOURCES;

+    goto ON_ERROR;

+  }

+

+  //

+  // Install the IP4_CONFIG and NIC_IP4CONFIG protocols

+  //

+  Status = gBS->InstallMultipleProtocolInterfaces (

+                  &ControllerHandle,

+                  &gEfiIp4ConfigProtocolGuid,

+                  &Instance->Ip4ConfigProtocol,

+                  &gEfiNicIp4ConfigProtocolGuid,

+                  &Instance->NicIp4Protocol,

+                  NULL

+                  );

+

+  if (EFI_ERROR (Status)) {

+    mIp4ConfigNicList[Index] = NULL;

+    goto ON_ERROR;

+  }

+

+  //

+  // Get the previous configure parameters. If an error happend here,

+  // just ignore it because the driver should be able to operate.

+  //

+  Variable = Ip4ConfigReadVariable ();

+

+  if (Variable == NULL) {

+    return EFI_SUCCESS;

+  }

+

+  NicConfig = Ip4ConfigFindNicVariable (Variable, &Instance->NicAddr);

+

+  if (NicConfig == NULL) {

+    goto ON_EXIT;

+  }

+

+  //

+  // Don't modify the permant static configuration

+  //

+  if (NicConfig->Perment && (NicConfig->Source == IP4_CONFIG_SOURCE_STATIC)) {

+    goto ON_EXIT;

+  }

+

+  //

+  // Delete the non-permant configuration and remove the previous

+  // acquired DHCP parameters. Only doing DHCP itself is permant

+  //

+  NewVariable = NULL;

+

+  if (!NicConfig->Perment) {

+    NewVariable = Ip4ConfigModifyVariable (Variable, &Instance->NicAddr, NULL);

+

+  } else if (NicConfig->Source == IP4_CONFIG_SOURCE_DHCP) {

+    NetZeroMem (&NicConfig->Ip4Info, sizeof (EFI_IP4_IPCONFIG_DATA));

+    NewVariable = Ip4ConfigModifyVariable (Variable, &Instance->NicAddr, NicConfig);

+

+  }

+

+  Ip4ConfigWriteVariable (NewVariable);

+

+  if (NewVariable != NULL) {

+    NetFreePool (NewVariable);

+  }

+

+ON_EXIT:

+  NetFreePool (Variable);

+

+  if (NicConfig != NULL) {

+    NetFreePool (NicConfig);

+  }

+

+  return EFI_SUCCESS;

+

+ON_ERROR:

+  if (Instance != NULL) {

+    NetFreePool (Instance);

+  }

+

+  if (Mnp != NULL) {

+    gBS->CloseProtocol (

+          MnpHandle,

+          &gEfiManagedNetworkProtocolGuid,

+          This->DriverBindingHandle,

+          ControllerHandle

+          );

+  }

+

+  NetLibDestroyServiceChild (

+    ControllerHandle,

+    This->DriverBindingHandle,

+    &gEfiManagedNetworkProtocolGuid,

+    MnpHandle

+    );

+

+  return Status;

+}

+

+

+/**

+  Stop this driver on ControllerHandle.

+

+  @param  This                 Protocol instance pointer.

+  @param  ControllerHandle     Handle of device to stop driver on

+  @param  NumberOfChildren     Number of Handles in ChildHandleBuffer. If number of

+                                children is zero stop the entire bus driver.

+  @param  ChildHandleBuffer    List of Child Handles to Stop.

+

+  @retval EFI_SUCCES           This driver is removed ControllerHandle

+  @retval other                This driver was not removed from this device

+

+**/

+EFI_STATUS

+EFIAPI

+Ip4ConfigDriverBindingStop (

+  IN EFI_DRIVER_BINDING_PROTOCOL  *This,

+  IN EFI_HANDLE                   ControllerHandle,

+  IN UINTN                        NumberOfChildren,

+  IN EFI_HANDLE                   *ChildHandleBuffer

+  )

+{

+  IP4_CONFIG_INSTANCE       *Instance;

+  EFI_IP4_CONFIG_PROTOCOL   *Ip4Config;

+  EFI_HANDLE                NicHandle;

+  EFI_STATUS                Status;

+

+  //

+  // IP4_CONFIG instance opens an MNP child. It may also create and open

+  // a DHCP child. If this is the DHCP handle, stop the DHCP process. If

+  // it is the MNP child, stop the whole driver.

+  //

+  //

+  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiDhcp4ProtocolGuid);

+

+  if (NicHandle != NULL) {

+    //

+    // Get our context back then clean the DHCP up. Notify the user if necessary.

+    //

+    Status = gBS->OpenProtocol (

+                    NicHandle,

+                    &gEfiIp4ConfigProtocolGuid,

+                    (VOID **) &Ip4Config,

+                    This->DriverBindingHandle,

+                    ControllerHandle,

+                    EFI_OPEN_PROTOCOL_GET_PROTOCOL

+                    );

+

+    if (EFI_ERROR (Status)) {

+      return Status;

+    }

+

+    Instance = IP4_CONFIG_INSTANCE_FROM_IP4CONFIG (Ip4Config);

+    ASSERT (ControllerHandle == Instance->Dhcp4Handle);

+

+    Ip4ConfigCleanDhcp4 (Instance);

+

+    Instance->State   = IP4_CONFIG_STATE_CONFIGURED;

+    Instance->Result  = EFI_DEVICE_ERROR;

+

+    if (Instance->DoneEvent != NULL) {

+      gBS->SignalEvent (Instance->DoneEvent);

+    }

+

+    return EFI_SUCCESS;

+  }

+

+  //

+  // This is a MNP handle, stop the whole driver

+  //

+  NicHandle = NetLibGetNicHandle (ControllerHandle, &gEfiManagedNetworkProtocolGuid);

+

+  if (NicHandle == NULL) {

+    return EFI_SUCCESS;

+  }

+

+  //

+  // Get our context back.

+  //

+  Status = gBS->OpenProtocol (

+                  NicHandle,

+                  &gEfiIp4ConfigProtocolGuid,

+                  (VOID **) &Ip4Config,

+                  This->DriverBindingHandle,

+                  ControllerHandle,

+                  EFI_OPEN_PROTOCOL_GET_PROTOCOL

+                  );

+

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  Instance = IP4_CONFIG_INSTANCE_FROM_IP4CONFIG (Ip4Config);

+

+  //

+  // Unload the protocols first to inform the top drivers

+  //

+  Status = gBS->UninstallMultipleProtocolInterfaces (

+                  NicHandle,

+                  &gEfiIp4ConfigProtocolGuid,

+                  &Instance->Ip4ConfigProtocol,

+                  &gEfiNicIp4ConfigProtocolGuid,

+                  &Instance->NicIp4Protocol,

+                  NULL

+                  );

+

+  if (EFI_ERROR (Status)) {

+    return Status;

+  }

+

+  //

+  // Release all the resources

+  //

+  if (Instance->MnpHandle != NULL) {

+    gBS->CloseProtocol (

+          Instance->MnpHandle,

+          &gEfiManagedNetworkProtocolGuid,

+          This->DriverBindingHandle,

+          NicHandle

+          );

+

+    NetLibDestroyServiceChild (

+      NicHandle,

+      Instance->Image,

+      &gEfiManagedNetworkServiceBindingProtocolGuid,

+      Instance->MnpHandle

+      );

+

+    Instance->Mnp       = NULL;

+    Instance->MnpHandle = NULL;

+  }

+

+  Ip4ConfigCleanConfig (Instance);

+  mIp4ConfigNicList[Instance->NicIndex] = NULL;

+  NetFreePool (Instance);

+

+  return EFI_SUCCESS;

+}

+

+EFI_DRIVER_BINDING_PROTOCOL gIp4ConfigDriverBinding = {

+  Ip4ConfigDriverBindingSupported,

+  Ip4ConfigDriverBindingStart,

+  Ip4ConfigDriverBindingStop,

+  0xa,

+  NULL,

+  NULL

+};

diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.inf b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.inf
new file mode 100644
index 0000000..2fc16ef
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.inf
@@ -0,0 +1,64 @@
+#/** @file

+# Component name for module Ip4Config

+#

+# FIX ME!

+# Copyright (c) 2006, Intel Corporation. All right reserved.

+#

+#  All rights reserved. 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.

+#

+#

+#**/

+

+[Defines]

+  INF_VERSION                    = 0x00010005

+  BASE_NAME                      = Ip4ConfigDxe

+  FILE_GUID                      = 26841BDE-920A-4e7a-9FBE-637F477143A6

+  MODULE_TYPE                    = DXE_DRIVER

+  VERSION_STRING                 = 1.0

+  EDK_RELEASE_VERSION            = 0x00020000

+  EFI_SPECIFICATION_VERSION      = 0x00020000

+

+  ENTRY_POINT                    = Ip4ConfigDriverEntryPoint

+

+#

+# The following information is for reference only and not required by the build tools.

+#

+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC

+#

+

+[Sources.common]

+  ComponentName.c

+  NicIp4Variable.c

+  Ip4ConfigDriver.c

+  Ip4Config.h

+  NicIp4Variable.h

+  Ip4Config.c

+

+[Packages]

+  MdePkg/MdePkg.dec

+  MdeModulePkg/MdeModulePkg.dec

+

+

+[LibraryClasses]

+  UefiLib

+  UefiBootServicesTableLib

+  UefiDriverEntryPoint

+  UefiRuntimeServicesTableLib

+  DebugLib

+  NetLib

+

+

+[Protocols]

+  gEfiDhcp4ServiceBindingProtocolGuid           # PROTOCOL ALWAYS_CONSUMED

+  gEfiManagedNetworkServiceBindingProtocolGuid  # PROTOCOL ALWAYS_CONSUMED

+  gEfiIp4ConfigProtocolGuid                     # PROTOCOL ALWAYS_CONSUMED

+  gEfiManagedNetworkProtocolGuid                # PROTOCOL ALWAYS_CONSUMED

+  gEfiDhcp4ProtocolGuid                         # PROTOCOL ALWAYS_CONSUMED

+  gEfiNicIp4ConfigVariableGuid                  # PROTOCOL ALWAYS_CONSUMED

+  gEfiNicIp4ConfigProtocolGuid                  # PROTOCOL ALWAYS_CONSUMED
\ No newline at end of file
diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.msa b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.msa
new file mode 100644
index 0000000..94eb98e
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/Ip4ConfigDxe.msa
@@ -0,0 +1,77 @@
+<ModuleSurfaceArea xmlns="http://www.TianoCore.org/2006/Edk2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

+  <MsaHeader>

+    <ModuleName>Ip4Config</ModuleName>

+    <ModuleType>DXE_DRIVER</ModuleType>

+    <GuidValue>26841BDE-920A-4e7a-9FBE-637F477143A6</GuidValue>

+    <Version>1.0</Version>

+    <Abstract>Component name for module Ip4Config</Abstract>

+    <Description>FIX ME!</Description>

+    <Copyright>Copyright (c) 2006, Intel Corporation. All right reserved.</Copyright>

+    <License>All rights reserved. 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.</License>

+    <Specification>FRAMEWORK_BUILD_PACKAGING_SPECIFICATION   0x00000052</Specification>

+  </MsaHeader>

+  <ModuleDefinitions>

+    <SupportedArchitectures>IA32 X64 IPF EBC</SupportedArchitectures>

+    <BinaryModule>false</BinaryModule>

+    <OutputFileBasename>Ip4Config</OutputFileBasename>

+  </ModuleDefinitions>

+  <LibraryClassDefinitions>

+    <LibraryClass Usage="ALWAYS_CONSUMED">

+      <Keyword>DebugLib</Keyword>

+    </LibraryClass>

+    <LibraryClass Usage="ALWAYS_CONSUMED">

+      <Keyword>UefiRuntimeServicesTableLib</Keyword>

+    </LibraryClass>

+    <LibraryClass Usage="ALWAYS_CONSUMED">

+      <Keyword>UefiDriverEntryPoint</Keyword>

+    </LibraryClass>

+    <LibraryClass Usage="ALWAYS_CONSUMED">

+      <Keyword>UefiBootServicesTableLib</Keyword>

+    </LibraryClass>

+    <LibraryClass Usage="ALWAYS_CONSUMED">

+      <Keyword>UefiLib</Keyword>

+    </LibraryClass>

+  </LibraryClassDefinitions>

+  <SourceFiles>

+    <Filename>Ip4Config.c</Filename>

+    <Filename>NicIp4Variable.h</Filename>

+    <Filename>Ip4Config.h</Filename>

+    <Filename>Ip4ConfigDriver.c</Filename>

+    <Filename>NicIp4Variable.c</Filename>

+    <Filename>ComponentName.c</Filename>

+  </SourceFiles>

+  <PackageDependencies>

+    <Package PackageGuid="5e0e9358-46b6-4ae2-8218-4ab8b9bbdcec"/>

+    <Package PackageGuid="68169ab0-d41b-4009-9060-292c253ac43d"/>

+  </PackageDependencies>

+  <Protocols>

+    <Protocol Usage="ALWAYS_CONSUMED">

+      <ProtocolCName>gEfiDhcp4ProtocolGuid</ProtocolCName>

+    </Protocol>

+    <Protocol Usage="ALWAYS_CONSUMED">

+      <ProtocolCName>gEfiManagedNetworkProtocolGuid</ProtocolCName>

+    </Protocol>

+    <Protocol Usage="ALWAYS_CONSUMED">

+      <ProtocolCName>gEfiIp4ConfigProtocolGuid</ProtocolCName>

+    </Protocol>

+    <Protocol Usage="ALWAYS_CONSUMED">

+      <ProtocolCName>gEfiManagedNetworkServiceBindingProtocolGuid</ProtocolCName>

+    </Protocol>

+    <Protocol Usage="ALWAYS_CONSUMED">

+      <ProtocolCName>gEfiDhcp4ServiceBindingProtocolGuid</ProtocolCName>

+    </Protocol>

+  </Protocols>

+  <Externs>

+    <Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>

+    <Specification>EDK_RELEASE_VERSION 0x00020000</Specification>

+    <Extern>

+      <ModuleEntryPoint>Ip4ConfigDriverEntryPoint</ModuleEntryPoint>

+    </Extern>

+  </Externs>

+</ModuleSurfaceArea>
\ No newline at end of file
diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.c b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.c
new file mode 100644
index 0000000..ac5283f
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.c
@@ -0,0 +1,383 @@
+/** @file

+

+Copyright (c) 2006, Intel Corporation

+All rights reserved. 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.

+

+Module Name:

+

+  NicIp4Variable.c

+

+Abstract:

+

+  Routines used to operate the Ip4 configure variable

+

+

+**/

+

+

+#include <Library/NetLib.h>

+#include <Library/DebugLib.h>

+#include <Library/BaseMemoryLib.h>

+#include <Library/MemoryAllocationLib.h>

+#include <Library/UefiBootServicesTableLib.h>

+#include <Library/UefiRuntimeServicesTableLib.h>

+

+#include "NicIp4Variable.h"

+

+

+/**

+  Check whether the configure parameter is valid.

+

+  @param  NicConfig    The configure parameter to check

+

+  @return TRUE if the parameter is valid for the interface, otherwise FALSE.

+

+**/

+BOOLEAN

+Ip4ConfigIsValid (

+  IN NIC_IP4_CONFIG_INFO    *NicConfig

+  )

+{

+  EFI_IP4_IPCONFIG_DATA     *IpConfig;

+  IP4_ADDR                  Station;

+  IP4_ADDR                  Netmask;

+  IP4_ADDR                  Gateway;

+  UINT32                    Index;

+

+  IpConfig = &NicConfig->Ip4Info;

+

+  if (NicConfig->Source == IP4_CONFIG_SOURCE_STATIC) {

+    //

+    // Validate that the addresses are unicast and mask

+    // is properly formated

+    //

+    Station = EFI_NTOHL (IpConfig->StationAddress);

+    Netmask = EFI_NTOHL (IpConfig->SubnetMask);

+

+    if ((Netmask == 0) || !IP4_IS_VALID_NETMASK (Netmask) ||

+        (Station == 0) || !Ip4IsUnicast (Station, Netmask)) {

+      return FALSE;

+    }

+

+    //

+    // Validate that the next hops are on the connected network

+    // or that is a direct route (Gateway == 0).

+    //

+    for (Index = 0; Index < IpConfig->RouteTableSize; Index++) {

+      Gateway = EFI_NTOHL (IpConfig->RouteTable[Index].GatewayAddress);

+

+      if ((Gateway != 0) && (!IP4_NET_EQUAL (Station, Gateway, Netmask) ||

+          !Ip4IsUnicast (Gateway, Netmask))) {

+        return FALSE;

+      }

+    }

+

+    return TRUE;

+  }

+

+  //

+  // return false if it is an unkown configure source. Valid

+  // sources are static and dhcp.

+  //

+  return (BOOLEAN) (NicConfig->Source == IP4_CONFIG_SOURCE_DHCP);

+}

+

+

+

+/**

+  Read the ip4 configure variable from the EFI variable

+

+  None

+

+  @return The IP4 configure read if it is there and is valid, otherwise NULL

+

+**/

+IP4_CONFIG_VARIABLE *

+Ip4ConfigReadVariable (

+  VOID

+  )

+{

+  IP4_CONFIG_VARIABLE       *Variable;

+  EFI_STATUS                Status;

+  UINTN                     Size;

+  UINT16                    CheckSum;

+

+  //

+  // Get the size of variable, then allocate a buffer to read the variable.

+  //

+  Size     = 0;

+  Variable = NULL;

+  Status   = gRT->GetVariable (

+                    EFI_NIC_IP4_CONFIG_VARIABLE,

+                    &gEfiNicIp4ConfigVariableGuid,

+                    NULL,

+                    &Size,

+                    NULL

+                    );

+

+  if (Status != EFI_BUFFER_TOO_SMALL) {

+    return NULL;

+  }

+

+  if (Size < sizeof (IP4_CONFIG_VARIABLE)) {

+    goto REMOVE_VARIABLE;

+  }

+

+  Variable = NetAllocatePool (Size);

+

+  if (Variable == NULL) {

+    return NULL;

+  }

+

+  Status = gRT->GetVariable (

+                  EFI_NIC_IP4_CONFIG_VARIABLE,

+                  &gEfiNicIp4ConfigVariableGuid,

+                  NULL,

+                  &Size,

+                  Variable

+                  );

+

+  if (EFI_ERROR (Status)) {

+    goto ON_ERROR;

+  }

+

+  //

+  // Verify the checksum, variable size and count

+  //

+  CheckSum = ~NetblockChecksum ((UINT8 *) Variable, (UINT32)Size);

+

+  if ((CheckSum != 0) || (Size != Variable->Len)) {

+    goto REMOVE_VARIABLE;

+  }

+

+  if ((Variable->Count < 1) || (Variable->Count > MAX_IP4_CONFIG_IN_VARIABLE)) {

+    goto REMOVE_VARIABLE;

+  }

+

+  return Variable;

+

+REMOVE_VARIABLE:

+  Ip4ConfigWriteVariable (NULL);

+

+ON_ERROR:

+  if (Variable != NULL) {

+    NetFreePool (Variable);

+  }

+

+  return NULL;

+}

+

+

+/**

+  Write the IP4 configure variable to the NVRAM. If Config

+  is NULL, remove the variable.

+

+  @param  Config       The IP4 configure data to write

+

+  @retval EFI_SUCCESS  The variable is written to the NVRam

+  @retval Others       Failed to write the variable.

+

+**/

+EFI_STATUS

+Ip4ConfigWriteVariable (

+  IN IP4_CONFIG_VARIABLE    * Config        OPTIONAL

+  )

+{

+  EFI_STATUS                Status;

+

+  Status = gRT->SetVariable (

+                  EFI_NIC_IP4_CONFIG_VARIABLE,

+                  &gEfiNicIp4ConfigVariableGuid,

+                  IP4_CONFIG_VARIABLE_ATTRIBUTES,

+                  (Config == NULL) ? 0 : Config->Len,

+                  Config

+                  );

+

+  return Status;

+}

+

+

+/**

+  Locate the IP4 configure parameters from the variable.If a

+  configuration is found, copy it to a newly allocated block

+  of memory to avoid the alignment problem. Caller should

+  release the memory after use.

+

+  @param  Variable     The IP4 configure variable to search in

+  @param  NicAddr      The interface address to check

+

+  @return The point to the NIC's IP4 configure info if it is found

+  @return in the IP4 variable, otherwise NULL.

+

+**/

+NIC_IP4_CONFIG_INFO *

+Ip4ConfigFindNicVariable (

+  IN IP4_CONFIG_VARIABLE    *Variable,

+  IN NIC_ADDR               *NicAddr

+  )

+{

+  NIC_IP4_CONFIG_INFO       Temp;

+  NIC_IP4_CONFIG_INFO       *Config;

+  UINT32                    Index;

+  UINT8                     *Cur;

+  UINT32                    Len;

+

+  Cur = (UINT8*)&Variable->ConfigInfo;

+

+  for (Index = 0; Index < Variable->Count; Index++) {

+    //

+    // Copy the data to Temp to avoid the alignment problems

+    //

+    NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));

+    Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);

+

+    //

+    // Found the matching configuration parameters, allocate

+    // a block of memory then copy it out.

+    //

+    if (NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {

+      Config = NetAllocatePool (Len);

+

+      if (Config == NULL) {

+        return NULL;

+      }

+

+      NetCopyMem (Config, Cur, Len);

+      return Config;

+    }

+

+    Cur += Len;

+  }

+

+  return NULL;

+}

+

+

+/**

+  Modify the configuration parameter for the NIC in the variable.

+  If Config is NULL, old configuration will be remove from the new

+  variable. Otherwise, append it or replace the old one.

+

+  @param  Variable     The IP4 variable to change

+  @param  NicAddr      The interface to search

+  @param  Config       The new configuration parameter (NULL to remove the old)

+

+  @return The new IP4_CONFIG_VARIABLE variable if the new variable has at

+  @return least one NIC configure and no EFI_OUT_OF_RESOURCES failure.

+  @return Return NULL either because failed to locate memory for new variable

+  @return or the only NIC configure is removed from the Variable.

+

+**/

+IP4_CONFIG_VARIABLE *

+Ip4ConfigModifyVariable (

+  IN IP4_CONFIG_VARIABLE    *Variable,    OPTIONAL

+  IN NIC_ADDR               *NicAddr,

+  IN NIC_IP4_CONFIG_INFO    *Config       OPTIONAL

+  )

+{

+  NIC_IP4_CONFIG_INFO       Temp;

+  NIC_IP4_CONFIG_INFO       *Old;

+  IP4_CONFIG_VARIABLE       *NewVar;

+  UINT32                    Len;

+  UINT32                    TotalLen;

+  UINT32                    Count;

+  UINT8                     *Next;

+  UINT8                     *Cur;

+  UINT32                    Index;

+

+  ASSERT ((Variable != NULL) || (Config != NULL));

+

+  //

+  // Compute the total length

+  //

+  if (Variable != NULL) {

+    //

+    // Variable != NULL, then Config can be NULL or not.  and so is

+    // the Old. If old configure exists, it is removed from the

+    // Variable. New configure is append to the variable.

+    //

+    //

+    Count     = Variable->Count;

+    Cur       = (UINT8 *)&Variable->ConfigInfo;

+    TotalLen  = Variable->Len;

+

+    Old       = Ip4ConfigFindNicVariable (Variable, NicAddr);

+

+    if (Old != NULL) {

+      TotalLen -= SIZEOF_NIC_IP4_CONFIG_INFO (Old);

+      NetFreePool (Old);

+    }

+

+    if (Config != NULL) {

+      TotalLen += SIZEOF_NIC_IP4_CONFIG_INFO (Config);

+    }

+

+    //

+    // Return NULL if the only NIC_IP4_CONFIG_INFO is being removed.

+    //

+    if (TotalLen < sizeof (IP4_CONFIG_VARIABLE)) {

+      return NULL;

+    }

+

+  } else {

+    //

+    // Variable == NULL and Config != NULL, Create a new variable with

+    // this NIC configure.

+    //

+    Count     = 0;

+    Cur       = NULL;

+    TotalLen  = sizeof (IP4_CONFIG_VARIABLE) - sizeof (NIC_IP4_CONFIG_INFO)

+                + SIZEOF_NIC_IP4_CONFIG_INFO (Config);

+  }

+

+  ASSERT (TotalLen >= sizeof (IP4_CONFIG_VARIABLE));

+

+  NewVar = NetAllocateZeroPool (TotalLen);

+

+  if (NewVar == NULL) {

+    return NULL;

+  }

+

+  NewVar->Len = TotalLen;

+

+  //

+  // Copy the other configure parameters from the old variable

+  //

+  Next = (UINT8 *)&NewVar->ConfigInfo;

+

+  for (Index = 0; Index < Count; Index++) {

+    NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));

+    Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);

+

+    if (!NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {

+      NetCopyMem (Next, Cur, Len);

+      Next += Len;

+      NewVar->Count++;

+    }

+

+    Cur += Len;

+  }

+

+  //

+  // Append the new configure if it isn't NULL.

+  //

+  Len = 0;

+

+  if (Config != NULL) {

+    Len = SIZEOF_NIC_IP4_CONFIG_INFO (Config);

+

+    NetCopyMem (Next, Config, Len);

+    NewVar->Count++;

+  }

+

+  ASSERT (Next + Len == (UINT8 *) NewVar + TotalLen);

+

+  NewVar->CheckSum = ~NetblockChecksum ((UINT8 *) NewVar, TotalLen);

+  return NewVar;

+}

diff --git a/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.h b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.h
new file mode 100644
index 0000000..74d1660
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/Ip4ConfigDxe/NicIp4Variable.h
@@ -0,0 +1,75 @@
+/** @file
+
+Copyright (c) 2006, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+
+  NicIp4Variable.h
+
+Abstract:
+
+  Routines used to operate the Ip4 configure variable
+
+
+**/
+
+#ifndef _NIC_IP4_VARIABLE_H_
+#define _NIC_IP4_VARIABLE_H_
+
+
+#include <Protocol/NicIp4Config.h>
+
+//
+// Return the size of NIC_IP4_CONFIG_INFO and EFI_IP4_IPCONFIG_DATA.
+// They are of variable size
+//
+#define SIZEOF_IP4_CONFIG_INFO(Ip4Config) \
+  (sizeof (EFI_IP4_IPCONFIG_DATA) + \
+   sizeof (EFI_IP4_ROUTE_TABLE) * (NET_MAX (1, (Ip4Config)->RouteTableSize) - 1))
+
+#define SIZEOF_NIC_IP4_CONFIG_INFO(NicConfig) \
+  (sizeof (NIC_IP4_CONFIG_INFO) + \
+   sizeof (EFI_IP4_ROUTE_TABLE) * (NET_MAX (1, (NicConfig)->Ip4Info.RouteTableSize) - 1))
+
+//
+// Compare whether two NIC address are equal includes their type and length.
+//
+#define NIC_ADDR_EQUAL(Nic1, Nic2) \
+  (((Nic1)->Type == (Nic2)->Type) && ((Nic1)->Len == (Nic2)->Len) && \
+   NET_MAC_EQUAL (&(Nic1)->MacAddr, &(Nic2)->MacAddr, (Nic1)->Len))
+
+BOOLEAN
+Ip4ConfigIsValid (
+  IN NIC_IP4_CONFIG_INFO    *NicConfig
+  );
+
+IP4_CONFIG_VARIABLE *
+Ip4ConfigReadVariable (
+  VOID
+  );
+
+EFI_STATUS
+Ip4ConfigWriteVariable (
+  IN IP4_CONFIG_VARIABLE    *Config       OPTIONAL
+  );
+
+NIC_IP4_CONFIG_INFO *
+Ip4ConfigFindNicVariable (
+  IN IP4_CONFIG_VARIABLE    *Variable,
+  IN NIC_ADDR               *NicAddr
+  );
+
+IP4_CONFIG_VARIABLE *
+Ip4ConfigModifyVariable (
+  IN IP4_CONFIG_VARIABLE    *Variable,    OPTIONAL
+  IN NIC_ADDR               *NicAddr,
+  IN NIC_IP4_CONFIG_INFO    *Config       OPTIONAL
+  );
+#endif