MdePkg/Include/Protocol/Ip4.h

   1 /** @file
   2
   3   This file defines the EFI IPv4 (Internet Protocol version 4)
   4   Protocol interface. It is split into the following three main
   5   sections:
   6   - EFI IPv4 Service Binding Protocol
   7   - EFI IPv4 Variable
   8   - EFI IPv4 Protocol The EFI IPv4 Protocol provides basic
   9     network IPv4 packet I/O services, which includes support for
  10     a subset of the Internet Control Message Protocol (ICMP) and
  11     may include support for the Internet Group Management
  12     Protocol (IGMP).
  13
  14   Copyright (c) 2006 - 2008, Intel Corporation
  15   All rights reserved. This program and the accompanying materials
  16   are licensed and made available under the terms and conditions of the BSD License
  17   which accompanies this distribution.  The full text of the license may be found at
  18   http://opensource.org/licenses/bsd-license.php
  19
  20   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  21   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  22
  23 **/
  24
  25 #ifndef __EFI_IP4_PROTOCOL_H__
  26 #define __EFI_IP4_PROTOCOL_H__
  27
  28 #include <Protocol/ManagedNetwork.h>
  29
  30 #define EFI_IP4_SERVICE_BINDING_PROTOCOL_GUID \
  31   { \
  32     0xc51711e7, 0xb4bf, 0x404a, {0xbf, 0xb8, 0x0a, 0x04, 0x8e, 0xf1, 0xff, 0xe4 } \
  33   }
  34
  35 #define EFI_IP4_PROTOCOL_GUID \
  36   { \
  37     0x41d94cd2, 0x35b6, 0x455a, {0x82, 0x58, 0xd4, 0xe5, 0x13, 0x34, 0xaa, 0xdd } \
  38   }
  39
  40 typedef struct _EFI_IP4_PROTOCOL EFI_IP4_PROTOCOL;
  41
  42 typedef struct {
  43   EFI_HANDLE              InstanceHandle;
  44   EFI_IPv4_ADDRESS        Ip4Address;
  45   EFI_IPv4_ADDRESS        SubnetMask;
  46 } EFI_IP4_ADDRESS_PAIR;
  47
  48 typedef struct {
  49   EFI_HANDLE              DriverHandle;
  50   UINT32                  AddressCount;
  51   EFI_IP4_ADDRESS_PAIR    AddressPairs[1];
  52 } EFI_IP4_VARIABLE_DATA;
  53
  54 typedef struct {
  55   UINT8                   DefaultProtocol;
  56   BOOLEAN                 AcceptAnyProtocol;
  57   BOOLEAN                 AcceptIcmpErrors;
  58   BOOLEAN                 AcceptBroadcast;
  59   BOOLEAN                 AcceptPromiscuous;
  60   BOOLEAN                 UseDefaultAddress;
  61   EFI_IPv4_ADDRESS        StationAddress;
  62   EFI_IPv4_ADDRESS        SubnetMask;
  63   UINT8                   TypeOfService;
  64   UINT8                   TimeToLive;
  65   BOOLEAN                 DoNotFragment;
  66   BOOLEAN                 RawData;
  67   UINT32                  ReceiveTimeout;
  68   UINT32                  TransmitTimeout;
  69 } EFI_IP4_CONFIG_DATA;
  70
  71
  72 typedef struct {
  73   EFI_IPv4_ADDRESS        SubnetAddress;
  74   EFI_IPv4_ADDRESS        SubnetMask;
  75   EFI_IPv4_ADDRESS        GatewayAddress;
  76 } EFI_IP4_ROUTE_TABLE;
  77
  78 typedef struct {
  79   UINT8                   Type;
  80   UINT8                   Code;
  81 } EFI_IP4_ICMP_TYPE;
  82
  83 typedef struct {
  84   BOOLEAN                 IsStarted;
  85   EFI_IP4_CONFIG_DATA     ConfigData;
  86   BOOLEAN                 IsConfigured;
  87   UINT32                  GroupCount;
  88   EFI_IPv4_ADDRESS        *GroupTable;
  89   UINT32                  RouteCount;
  90   EFI_IP4_ROUTE_TABLE     *RouteTable;
  91   UINT32                  IcmpTypeCount;
  92   EFI_IP4_ICMP_TYPE       *IcmpTypeList;
  93 } EFI_IP4_MODE_DATA;
  94
  95 #pragma pack(1)
  96
  97 typedef struct {
  98   UINT8                   HeaderLength:4;
  99   UINT8                   Version:4;
 100   UINT8                   TypeOfService;
 101   UINT16                  TotalLength;
 102   UINT16                  Identification;
 103   UINT16                  Fragmentation;
 104   UINT8                   TimeToLive;
 105   UINT8                   Protocol;
 106   UINT16                  Checksum;
 107   EFI_IPv4_ADDRESS        SourceAddress;
 108   EFI_IPv4_ADDRESS        DestinationAddress;
 109 } EFI_IP4_HEADER;
 110 #pragma pack()
 111
 112
 113 typedef struct {
 114   UINT32                  FragmentLength;
 115   VOID                    *FragmentBuffer;
 116 } EFI_IP4_FRAGMENT_DATA;
 117
 118
 119 typedef struct {
 120   EFI_TIME               TimeStamp;
 121   EFI_EVENT              RecycleSignal;
 122   UINT32                 HeaderLength;
 123   EFI_IP4_HEADER         *Header;
 124   UINT32                 OptionsLength;
 125   VOID                   *Options;
 126   UINT32                 DataLength;
 127   UINT32                 FragmentCount;
 128   EFI_IP4_FRAGMENT_DATA  FragmentTable[1];
 129 } EFI_IP4_RECEIVE_DATA;
 130
 131
 132 typedef struct {
 133   EFI_IPv4_ADDRESS       SourceAddress;
 134   EFI_IPv4_ADDRESS       GatewayAddress;
 135   UINT8                  Protocol;
 136   UINT8                  TypeOfService;
 137   UINT8                  TimeToLive;
 138   BOOLEAN                DoNotFragment;
 139 } EFI_IP4_OVERRIDE_DATA;
 140
 141 typedef struct {
 142   EFI_IPv4_ADDRESS       DestinationAddress;
 143   EFI_IP4_OVERRIDE_DATA  *OverrideData;      //OPTIONAL
 144   UINT32                 OptionsLength;      //OPTIONAL
 145   VOID                   *OptionsBuffer;     //OPTIONAL
 146   UINT32                 TotalDataLength;
 147   UINT32                 FragmentCount;
 148   EFI_IP4_FRAGMENT_DATA  FragmentTable[1];
 149 } EFI_IP4_TRANSMIT_DATA;
 150
 151 typedef struct {
 152   EFI_EVENT                Event;
 153   EFI_STATUS               Status;
 154   union {
 155     EFI_IP4_RECEIVE_DATA   *RxData;
 156     EFI_IP4_TRANSMIT_DATA  *TxData;
 157   } Packet;
 158 } EFI_IP4_COMPLETION_TOKEN;
 159
 160 /**
 161   Gets the current operational settings for this instance of the EFI IPv4 Protocol driver.
 162
 163   The GetModeData() function returns the current operational mode data for this
 164   driver instance. The data fields in EFI_IP4_MODE_DATA are read only. This
 165   function is used optionally to retrieve the operational mode data of underlying
 166   networks or drivers.
 167
 168   @param  This          Pointer to the EFI_IP4_PROTOCOL instance.
 169   @param  Ip4ModeData   Pointer to the EFI IPv4 Protocol mode data structure.
 170   @param  MnpConfigData Pointer to the managed network configuration data structure.
 171   @param  SnpModeData   Pointer to the simple network mode data structure.
 172
 173   @retval EFI_SUCCESS           The operation completed successfully.
 174   @retval EFI_INVALID_PARAMETER This is NULL.
 175   @retval EFI_OUT_OF_RESOURCES  The required mode data could not be allocated.
 176
 177 **/
 178 typedef
 179 EFI_STATUS
 180 (EFIAPI *EFI_IP4_GET_MODE_DATA)(
 181   IN CONST  EFI_IP4_PROTOCOL                *This,
 182   OUT       EFI_IP4_MODE_DATA               *Ip4ModeData     OPTIONAL,
 183   OUT       EFI_MANAGED_NETWORK_CONFIG_DATA *MnpConfigData   OPTIONAL,
 184   OUT       EFI_SIMPLE_NETWORK_MODE         *SnpModeData     OPTIONAL
 185   );
 186
 187 /**
 188   Assigns an IPv4 address and subnet mask to this EFI IPv4 Protocol driver instance.
 189
 190   The Configure() function is used to set, change, or reset the operational
 191   parameters and filter settings for this EFI IPv4 Protocol instance. Until these
 192   parameters have been set, no network traffic can be sent or received by this
 193   instance. Once the parameters have been reset (by calling this function with
 194   IpConfigData set to NULL), no more traffic can be sent or received until these
 195   parameters have been set again. Each EFI IPv4 Protocol instance can be started
 196   and stopped independently of each other by enabling or disabling their receive
 197   filter settings with the Configure() function.
 198
 199   When IpConfigData.UseDefaultAddress is set to FALSE, the new station address will
 200   be appended as an alias address into the addresses list in the EFI IPv4 Protocol
 201   driver. While set to TRUE, Configure() will trigger the EFI_IP4_CONFIG_PROTOCOL
 202   to retrieve the default IPv4 address if it is not available yet. Clients could
 203   frequently call GetModeData() to check the status to ensure that the default IPv4
 204   address is ready.
 205
 206   If operational parameters are reset or changed, any pending transmit and receive
 207   requests will be cancelled. Their completion token status will be set to EFI_ABORTED
 208   and their events will be signaled.
 209
 210   @param  This         Pointer to the EFI_IP4_PROTOCOL instance.
 211   @param  IpConfigData Pointer to the EFI IPv4 Protocol configuration data structure.
 212
 213   @retval EFI_SUCCESS           The driver instance was successfully opened.
 214   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 215                                 RARP, etc.) is not finished yet.
 216   @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
 217   @retval EFI_UNSUPPORTED       One or more of the following conditions is TRUE:
 218                                 A configuration protocol (DHCP, BOOTP, RARP, etc.) could
 219                                 not be located when clients choose to use the default IPv4
 220                                 address. This EFI IPv4 Protocol implementation does not
 221                                 support this requested filter or timeout setting.
 222   @retval EFI_OUT_OF_RESOURCES  The EFI IPv4 Protocol driver instance data could not be allocated.
 223   @retval EFI_ALREADY_STARTED   The interface is already open and must be stopped before the
 224                                 IPv4 address or subnet mask can be changed. The interface must
 225                                 also be stopped when switching to/from raw packet mode.
 226   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred. The EFI IPv4
 227                                 Protocol driver instance is not opened.
 228
 229 **/
 230 typedef
 231 EFI_STATUS
 232 (EFIAPI *EFI_IP4_CONFIGURE)(
 233   IN EFI_IP4_PROTOCOL    *This,
 234   IN EFI_IP4_CONFIG_DATA *IpConfigData     OPTIONAL
 235   );
 236
 237 /**
 238   Joins and leaves multicast groups.
 239
 240   The Groups() function is used to join and leave multicast group sessions. Joining
 241   a group will enable reception of matching multicast packets. Leaving a group will
 242   disable the multicast packet reception.
 243
 244   If JoinFlag is FALSE and GroupAddress is NULL, all joined groups will be left.
 245
 246   @param  This                  Pointer to the EFI_IP4_PROTOCOL instance.
 247   @param  JoinFlag              Set to TRUE to join the multicast group session and FALSE to leave.
 248   @param  GroupAddress          Pointer to the IPv4 multicast address.
 249
 250   @retval EFI_SUCCESS           The operation completed successfully.
 251   @retval EFI_INVALID_PARAMETER One or more of the following is TRUE:
 252                                 - This is NULL.
 253                                 - JoinFlag is TRUE and GroupAddress is NULL.
 254                                 - GroupAddress is not NULL and *GroupAddress is
 255                                 not a multicast IPv4 address.
 256   @retval EFI_NOT_STARTED       This instance has not been started.
 257   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 258                                 RARP, etc.) is not finished yet.
 259   @retval EFI_OUT_OF_RESOURCES  System resources could not be allocated.
 260   @retval EFI_UNSUPPORTED       This EFI IPv4 Protocol implementation does not support multicast groups.
 261   @retval EFI_ALREADY_STARTED   The group address is already in the group table (when
 262                                 JoinFlag is TRUE).
 263   @retval EFI_NOT_FOUND         The group address is not in the group table (when JoinFlag is FALSE).
 264   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 265
 266 **/
 267 typedef
 268 EFI_STATUS
 269 (EFIAPI *EFI_IP4_GROUPS)(
 270   IN EFI_IP4_PROTOCOL    *This,
 271   IN BOOLEAN             JoinFlag,
 272   IN EFI_IPv4_ADDRESS    *GroupAddress  OPTIONAL
 273   );
 274
 275 /**
 276   Adds and deletes routing table entries.
 277
 278   The Routes() function adds a route to or deletes a route from the routing table.
 279
 280   Routes are determined by comparing the SubnetAddress with the destination IPv4
 281   address arithmetically AND-ed with the SubnetMask. The gateway address must be
 282   on the same subnet as the configured station address.
 283
 284   The default route is added with SubnetAddress and SubnetMask both set to 0.0.0.0.
 285   The default route matches all destination IPv4 addresses that do not match any
 286   other routes.
 287
 288   A GatewayAddress that is zero is a nonroute. Packets are sent to the destination
 289   IP address if it can be found in the ARP cache or on the local subnet. One automatic
 290   nonroute entry will be inserted into the routing table for outgoing packets that
 291   are addressed to a local subnet (gateway address of 0.0.0.0).
 292
 293   Each EFI IPv4 Protocol instance has its own independent routing table. Those EFI
 294   IPv4 Protocol instances that use the default IPv4 address will also have copies
 295   of the routing table that was provided by the EFI_IP4_CONFIG_PROTOCOL, and these
 296   copies will be updated whenever the EIF IPv4 Protocol driver reconfigures its
 297   instances. As a result, client modification to the routing table will be lost.
 298
 299   @param  This                   Pointer to the EFI_IP4_PROTOCOL instance.
 300   @param  DeleteRoute            Set to TRUE to delete this route from the routing table. Set to
 301                                  FALSE to add this route to the routing table. SubnetAddress
 302                                  and SubnetMask are used as the key to each route entry.
 303   @param  SubnetAddress          The address of the subnet that needs to be routed.
 304   @param  SubnetMask             The subnet mask of SubnetAddress.
 305   @param  GatewayAddress         The unicast gateway IPv4 address for this route.
 306
 307   @retval EFI_SUCCESS            The operation completed successfully.
 308   @retval EFI_NOT_STARTED        The driver instance has not been started.
 309   @retval EFI_NO_MAPPING         When using the default address, configuration (DHCP, BOOTP,
 310                                  RARP, etc.) is not finished yet.
 311   @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
 312                                  - This is NULL.
 313                                  - SubnetAddress is NULL.
 314                                  - SubnetMask is NULL.
 315                                  - GatewayAddress is NULL.
 316                                  - *SubnetAddress is not a valid subnet address.
 317                                  - *SubnetMask is not a valid subnet mask.
 318                                  - *GatewayAddress is not a valid unicast IPv4 address.
 319   @retval EFI_OUT_OF_RESOURCES   Could not add the entry to the routing table.
 320   @retval EFI_NOT_FOUND          This route is not in the routing table (when DeleteRoute is TRUE).
 321   @retval EFI_ACCESS_DENIED      The route is already defined in the routing table (when
 322                                   DeleteRoute is FALSE).
 323
 324 **/
 325 typedef
 326 EFI_STATUS
 327 (EFIAPI *EFI_IP4_ROUTES)(
 328   IN EFI_IP4_PROTOCOL    *This,
 329   IN BOOLEAN             DeleteRoute,
 330   IN EFI_IPv4_ADDRESS    *SubnetAddress,
 331   IN EFI_IPv4_ADDRESS    *SubnetMask,
 332   IN EFI_IPv4_ADDRESS    *GatewayAddress
 333   );
 334
 335 /**
 336   Places outgoing data packets into the transmit queue.
 337
 338   The Transmit() function places a sending request in the transmit queue of this
 339   EFI IPv4 Protocol instance. Whenever the packet in the token is sent out or some
 340   errors occur, the event in the token will be signaled and the status is updated.
 341
 342   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 343   @param  Token Pointer to the transmit token.
 344
 345   @retval  EFI_SUCCESS           The data has been queued for transmission.
 346   @retval  EFI_NOT_STARTED       This instance has not been started.
 347   @retval  EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 348                                  RARP, etc.) is not finished yet.
 349   @retval  EFI_INVALID_PARAMETER One or more pameters are invalid.
 350   @retval  EFI_ACCESS_DENIED     The transmit completion token with the same Token.Event
 351                                  was already in the transmit queue.
 352   @retval  EFI_NOT_READY         The completion token could not be queued because the transmit
 353                                  queue is full.
 354   @retval  EFI_NOT_FOUND         Not route is found to destination address.
 355   @retval  EFI_OUT_OF_RESOURCES  Could not queue the transmit data.
 356   @retval  EFI_BUFFER_TOO_SMALL  Token.Packet.TxData.TotalDataLength is too
 357                                  short to transmit.
 358   @retval  EFI_BAD_BUFFER_SIZE   The length of the IPv4 header + option length + total data length is
 359                                  greater than MTU (or greater than the maximum packet size if
 360                                  Token.Packet.TxData.OverrideData.
 361                                  DoNotFragment is TRUE.)
 362
 363 **/
 364 typedef
 365 EFI_STATUS
 366 (EFIAPI *EFI_IP4_TRANSMIT)(
 367   IN EFI_IP4_PROTOCOL          *This,
 368   IN EFI_IP4_COMPLETION_TOKEN  *Token
 369   );
 370
 371 /**
 372   Places a receiving request into the receiving queue.
 373
 374   The Receive() function places a completion token into the receive packet queue.
 375   This function is always asynchronous.
 376
 377   The Token.Event field in the completion token must be filled in by the caller
 378   and cannot be NULL. When the receive operation completes, the EFI IPv4 Protocol
 379   driver updates the Token.Status and Token.Packet.RxData fields and the Token.Event
 380   is signaled.
 381
 382   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 383   @param  Token Pointer to a token that is associated with the receive data descriptor.
 384
 385   @retval EFI_SUCCESS           The receive completion token was cached.
 386   @retval EFI_NOT_STARTED       This EFI IPv4 Protocol instance has not been started.
 387   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP, RARP, etc.)
 388                                 is not finished yet.
 389   @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
 390                                 - This is NULL.
 391                                 - Token is NULL.
 392                                 - Token.Event is NULL.
 393   @retval EFI_OUT_OF_RESOURCES  The receive completion token could not be queued due to a lack of system
 394                                 resources (usually memory).
 395   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 396                                 The EFI IPv4 Protocol instance has been reset to startup defaults.
 397                                 EFI_ACCESS_DENIED The receive completion token with the same Token.Event was already
 398                                 in the receive queue.
 399   @retval EFI_NOT_READY         The receive request could not be queued because the receive queue is full.
 400   @retval EFI_ICMP_ERROR        An ICMP error packet was received.
 401
 402 **/
 403 typedef
 404 EFI_STATUS
 405 (EFIAPI *EFI_IP4_RECEIVE)(
 406   IN EFI_IP4_PROTOCOL          *This,
 407   IN EFI_IP4_COMPLETION_TOKEN  *Token
 408   );
 409
 410 /**
 411   Abort an asynchronous transmit or receive request.
 412
 413   The Cancel() function is used to abort a pending transmit or receive request.
 414   If the token is in the transmit or receive request queues, after calling this
 415   function, Token->Status will be set to EFI_ABORTED and then Token->Event will
 416   be signaled. If the token is not in one of the queues, which usually means the
 417   asynchronous operation has completed, this function will not signal the token
 418   and EFI_NOT_FOUND is returned.
 419
 420   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 421   @param  Token Pointer to a token that has been issued by
 422                 EFI_IP4_PROTOCOL.Transmit() or
 423                 EFI_IP4_PROTOCOL.Receive(). If NULL, all pending
 424                 tokens are aborted. Type EFI_IP4_COMPLETION_TOKEN is
 425                 defined in EFI_IP4_PROTOCOL.Transmit().
 426
 427   @retval EFI_SUCCESS           The asynchronous I/O request was aborted and
 428                                 Token.->Event was signaled. When Token is NULL, all
 429                                 pending requests were aborted and their events were signaled.
 430   @retval EFI_INVALID_PARAMETER This is NULL.
 431   @retval EFI_NOT_STARTED       This instance has not been started.
 432   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 433                                 RARP, etc.) is not finished yet.
 434   @retval EFI_NOT_FOUND         When Token is not NULL, the asynchronous I/O request was
 435                                 not found in the transmit or receive queue. It has either completed
 436                                 or was not issued by Transmit() and Receive().
 437
 438 **/
 439 typedef
 440 EFI_STATUS
 441 (EFIAPI *EFI_IP4_CANCEL)(
 442   IN EFI_IP4_PROTOCOL          *This,
 443   IN EFI_IP4_COMPLETION_TOKEN  *Token OPTIONAL
 444   );
 445
 446 /**
 447   Polls for incoming data packets and processes outgoing data packets.
 448
 449   The Poll() function polls for incoming data packets and processes outgoing data
 450   packets. Network drivers and applications can call the EFI_IP4_PROTOCOL.Poll()
 451   function to increase the rate that data packets are moved between the communications
 452   device and the transmit and receive queues.
 453
 454   In some systems the periodic timer event may not poll the underlying communications
 455   device fast enough to transmit and/or receive all data packets without missing
 456   incoming packets or dropping outgoing packets. Drivers and applications that are
 457   experiencing packet loss should try calling the EFI_IP4_PROTOCOL.Poll() function
 458   more often.
 459
 460   @param  This Pointer to the EFI_IP4_PROTOCOL instance.
 461
 462   @retval  EFI_SUCCESS           Incoming or outgoing data was processed.
 463   @retval  EFI_NOT_STARTED       This EFI IPv4 Protocol instance has not been started.
 464   @retval  EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 465                                  RARP, etc.) is not finished yet.
 466   @retval  EFI_INVALID_PARAMETER This is NULL.
 467   @retval  EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 468   @retval  EFI_NOT_READY         No incoming or outgoing data is processed.
 469   @retval  EFI_TIMEOUT           Data was dropped out of the transmit and/or receive queue.
 470                                  Consider increasing the polling rate.
 471
 472 **/
 473 typedef
 474 EFI_STATUS
 475 (EFIAPI *EFI_IP4_POLL)(
 476   IN EFI_IP4_PROTOCOL          *This
 477   );
 478
 479 ///
 480 /// The EFI IPv4 Protocol implements a simple packet-oriented interface that can be
 481 /// used by drivers, daemons, and applications to transmit and receive network packets.
 482 ///
 483 struct _EFI_IP4_PROTOCOL {
 484   EFI_IP4_GET_MODE_DATA        GetModeData;
 485   EFI_IP4_CONFIGURE            Configure;
 486   EFI_IP4_GROUPS               Groups;
 487   EFI_IP4_ROUTES               Routes;
 488   EFI_IP4_TRANSMIT             Transmit;
 489   EFI_IP4_RECEIVE              Receive;
 490   EFI_IP4_CANCEL               Cancel;
 491   EFI_IP4_POLL                 Poll;
 492 };
 493
 494 extern EFI_GUID gEfiIp4ServiceBindingProtocolGuid;
 495 extern EFI_GUID gEfiIp4ProtocolGuid;
 496
 497 #endif