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 - 2009, 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   ///
  56   /// The default IPv4 protocol packets to send and receive. Ignored
  57   /// when AcceptPromiscuous is TRUE.
  58   ///
  59   UINT8                   DefaultProtocol;
  60   ///
  61   /// Set to TRUE to receive all IPv4 packets that get through the receive filters.
  62   /// Set to FALSE to receive only the DefaultProtocol IPv4
  63   /// packets that get through the receive filters.
  64   ///
  65   BOOLEAN                 AcceptAnyProtocol;
  66   ///
  67   /// Set to TRUE to receive ICMP error report packets. Ignored when
  68   /// AcceptPromiscuous or AcceptAnyProtocol is TRUE.
  69   ///
  70   BOOLEAN                 AcceptIcmpErrors;
  71   ///
  72   /// Set to TRUE to receive broadcast IPv4 packets. Ignored when
  73   /// AcceptPromiscuous is TRUE.
  74   /// Set to FALSE to stop receiving broadcast IPv4 packets.
  75   ///
  76   BOOLEAN                 AcceptBroadcast;
  77   ///
  78   /// Set to TRUE to receive all IPv4 packets that are sent to any
  79   /// hardware address or any protocol address.
  80   /// Set to FALSE to stop receiving all promiscuous IPv4 packets
  81   ///
  82   BOOLEAN                 AcceptPromiscuous;
  83   ///
  84   /// Set to TRUE to use the default IPv4 address and default routing table.
  85   ///
  86   BOOLEAN                 UseDefaultAddress;
  87   ///
  88   /// The station IPv4 address that will be assigned to this EFI IPv4Protocol instance.
  89   ///
  90   EFI_IPv4_ADDRESS        StationAddress;
  91   ///
  92   /// The subnet address mask that is associated with the station address.
  93   ///
  94   EFI_IPv4_ADDRESS        SubnetMask;
  95   ///
  96   /// TypeOfService field in transmitted IPv4 packets.
  97   ///
  98   UINT8                   TypeOfService;
  99   ///
 100   /// TimeToLive field in transmitted IPv4 packets.
 101   ///
 102   UINT8                   TimeToLive;
 103   ///
 104   /// State of the DoNotFragment bit in transmitted IPv4 packets.
 105   ///
 106   BOOLEAN                 DoNotFragment;
 107   ///
 108   /// Set to TRUE to send and receive unformatted packets. The other
 109   /// IPv4 receive filters are still applied. Fragmentation is disabled for RawData mode.
 110   ///
 111   BOOLEAN                 RawData;
 112   ///
 113   /// The timer timeout value (number of microseconds) for the
 114   /// receive timeout event to be associated with each assembled
 115   /// packet. Zero means do not drop assembled packets.
 116   ///
 117   UINT32                  ReceiveTimeout;
 118   ///
 119   /// The timer timeout value (number of microseconds) for the
 120   /// transmit timeout event to be associated with each outgoing
 121   /// packet. Zero means do not drop outgoing packets.
 122   ///
 123   UINT32                  TransmitTimeout;
 124 } EFI_IP4_CONFIG_DATA;
 125
 126
 127 typedef struct {
 128   EFI_IPv4_ADDRESS        SubnetAddress;
 129   EFI_IPv4_ADDRESS        SubnetMask;
 130   EFI_IPv4_ADDRESS        GatewayAddress;
 131 } EFI_IP4_ROUTE_TABLE;
 132
 133 typedef struct {
 134   UINT8                   Type;
 135   UINT8                   Code;
 136 } EFI_IP4_ICMP_TYPE;
 137
 138 typedef struct {
 139   ///
 140   /// Set to TRUE after this EFI IPv4 Protocol instance has been successfully configured.
 141   ///
 142   BOOLEAN                 IsStarted;
 143   ///
 144   /// Current configuration settings.
 145   ///
 146   EFI_IP4_CONFIG_DATA     ConfigData;
 147   ///
 148   /// Set to TRUE when the EFI IPv4 Protocol instance has a station address and subnet mask.
 149   ///
 150   BOOLEAN                 IsConfigured;
 151   ///
 152   /// Number of joined multicast groups.
 153   ///
 154   UINT32                  GroupCount;
 155   ///
 156   /// List of joined multicast group addresses.
 157   ///
 158   EFI_IPv4_ADDRESS        *GroupTable;
 159   ///
 160   /// Number of entries in the routing table.
 161   ///
 162   UINT32                  RouteCount;
 163   ///
 164   /// Routing table entries.
 165   ///
 166   EFI_IP4_ROUTE_TABLE     *RouteTable;
 167   ///
 168   /// Number of entries in the supported ICMP types list.
 169   ///
 170   UINT32                  IcmpTypeCount;
 171   ///
 172   /// Array of ICMP types and codes that are supported by this EFI IPv4 Protocol driver
 173   ///
 174   EFI_IP4_ICMP_TYPE       *IcmpTypeList;
 175 } EFI_IP4_MODE_DATA;
 176
 177 #pragma pack(1)
 178
 179 typedef struct {
 180   UINT8                   HeaderLength:4;
 181   UINT8                   Version:4;
 182   UINT8                   TypeOfService;
 183   UINT16                  TotalLength;
 184   UINT16                  Identification;
 185   UINT16                  Fragmentation;
 186   UINT8                   TimeToLive;
 187   UINT8                   Protocol;
 188   UINT16                  Checksum;
 189   EFI_IPv4_ADDRESS        SourceAddress;
 190   EFI_IPv4_ADDRESS        DestinationAddress;
 191 } EFI_IP4_HEADER;
 192 #pragma pack()
 193
 194
 195 typedef struct {
 196   UINT32                  FragmentLength;
 197   VOID                    *FragmentBuffer;
 198 } EFI_IP4_FRAGMENT_DATA;
 199
 200
 201 typedef struct {
 202   EFI_TIME               TimeStamp;
 203   EFI_EVENT              RecycleSignal;
 204   UINT32                 HeaderLength;
 205   EFI_IP4_HEADER         *Header;
 206   UINT32                 OptionsLength;
 207   VOID                   *Options;
 208   UINT32                 DataLength;
 209   UINT32                 FragmentCount;
 210   EFI_IP4_FRAGMENT_DATA  FragmentTable[1];
 211 } EFI_IP4_RECEIVE_DATA;
 212
 213
 214 typedef struct {
 215   EFI_IPv4_ADDRESS       SourceAddress;
 216   EFI_IPv4_ADDRESS       GatewayAddress;
 217   UINT8                  Protocol;
 218   UINT8                  TypeOfService;
 219   UINT8                  TimeToLive;
 220   BOOLEAN                DoNotFragment;
 221 } EFI_IP4_OVERRIDE_DATA;
 222
 223 typedef struct {
 224   EFI_IPv4_ADDRESS       DestinationAddress;
 225   EFI_IP4_OVERRIDE_DATA  *OverrideData;      //OPTIONAL
 226   UINT32                 OptionsLength;      //OPTIONAL
 227   VOID                   *OptionsBuffer;     //OPTIONAL
 228   UINT32                 TotalDataLength;
 229   UINT32                 FragmentCount;
 230   EFI_IP4_FRAGMENT_DATA  FragmentTable[1];
 231 } EFI_IP4_TRANSMIT_DATA;
 232
 233 typedef struct {
 234   ///
 235   /// This Event will be signaled after the Status field is updated
 236   /// by the EFI IPv4 Protocol driver. The type of Event must be
 237   /// EFI_NOTIFY_SIGNAL. The Task Priority Level (TPL) of
 238   /// Event must be lower than or equal to TPL_CALLBACK.
 239   ///
 240   EFI_EVENT                Event;
 241   ///
 242   /// The status that is returned to the caller at the end of the operation
 243   /// to indicate whether this operation completed successfully.
 244   ///
 245   EFI_STATUS               Status;
 246   union {
 247     ///
 248     /// When this token is used for receiving, RxData is a pointer to the EFI_IP4_RECEIVE_DATA.
 249     ///
 250     EFI_IP4_RECEIVE_DATA   *RxData;
 251     ///
 252     /// When this token is used for transmitting, TxData is a pointer to the EFI_IP4_TRANSMIT_DATA.
 253     ///
 254     EFI_IP4_TRANSMIT_DATA  *TxData;
 255   } Packet;
 256 } EFI_IP4_COMPLETION_TOKEN;
 257
 258 /**
 259   Gets the current operational settings for this instance of the EFI IPv4 Protocol driver.
 260
 261   The GetModeData() function returns the current operational mode data for this
 262   driver instance. The data fields in EFI_IP4_MODE_DATA are read only. This
 263   function is used optionally to retrieve the operational mode data of underlying
 264   networks or drivers.
 265
 266   @param  This          Pointer to the EFI_IP4_PROTOCOL instance.
 267   @param  Ip4ModeData   Pointer to the EFI IPv4 Protocol mode data structure.
 268   @param  MnpConfigData Pointer to the managed network configuration data structure.
 269   @param  SnpModeData   Pointer to the simple network mode data structure.
 270
 271   @retval EFI_SUCCESS           The operation completed successfully.
 272   @retval EFI_INVALID_PARAMETER This is NULL.
 273   @retval EFI_OUT_OF_RESOURCES  The required mode data could not be allocated.
 274
 275 **/
 276 typedef
 277 EFI_STATUS
 278 (EFIAPI *EFI_IP4_GET_MODE_DATA)(
 279   IN CONST  EFI_IP4_PROTOCOL                *This,
 280   OUT       EFI_IP4_MODE_DATA               *Ip4ModeData     OPTIONAL,
 281   OUT       EFI_MANAGED_NETWORK_CONFIG_DATA *MnpConfigData   OPTIONAL,
 282   OUT       EFI_SIMPLE_NETWORK_MODE         *SnpModeData     OPTIONAL
 283   );
 284
 285 /**
 286   Assigns an IPv4 address and subnet mask to this EFI IPv4 Protocol driver instance.
 287
 288   The Configure() function is used to set, change, or reset the operational
 289   parameters and filter settings for this EFI IPv4 Protocol instance. Until these
 290   parameters have been set, no network traffic can be sent or received by this
 291   instance. Once the parameters have been reset (by calling this function with
 292   IpConfigData set to NULL), no more traffic can be sent or received until these
 293   parameters have been set again. Each EFI IPv4 Protocol instance can be started
 294   and stopped independently of each other by enabling or disabling their receive
 295   filter settings with the Configure() function.
 296
 297   When IpConfigData.UseDefaultAddress is set to FALSE, the new station address will
 298   be appended as an alias address into the addresses list in the EFI IPv4 Protocol
 299   driver. While set to TRUE, Configure() will trigger the EFI_IP4_CONFIG_PROTOCOL
 300   to retrieve the default IPv4 address if it is not available yet. Clients could
 301   frequently call GetModeData() to check the status to ensure that the default IPv4
 302   address is ready.
 303
 304   If operational parameters are reset or changed, any pending transmit and receive
 305   requests will be cancelled. Their completion token status will be set to EFI_ABORTED
 306   and their events will be signaled.
 307
 308   @param  This         Pointer to the EFI_IP4_PROTOCOL instance.
 309   @param  IpConfigData Pointer to the EFI IPv4 Protocol configuration data structure.
 310
 311   @retval EFI_SUCCESS           The driver instance was successfully opened.
 312   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 313                                 RARP, etc.) is not finished yet.
 314   @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
 315                                 This is NULL.
 316                                 IpConfigData.StationAddress is not a unicast IPv4 address.
 317                                 IpConfigData.SubnetMask is not a valid IPv4 subnet
 318   @retval EFI_UNSUPPORTED       One or more of the following conditions is TRUE:
 319                                 A configuration protocol (DHCP, BOOTP, RARP, etc.) could
 320                                 not be located when clients choose to use the default IPv4
 321                                 address. This EFI IPv4 Protocol implementation does not
 322                                 support this requested filter or timeout setting.
 323   @retval EFI_OUT_OF_RESOURCES  The EFI IPv4 Protocol driver instance data could not be allocated.
 324   @retval EFI_ALREADY_STARTED   The interface is already open and must be stopped before the
 325                                 IPv4 address or subnet mask can be changed. The interface must
 326                                 also be stopped when switching to/from raw packet mode.
 327   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred. The EFI IPv4
 328                                 Protocol driver instance is not opened.
 329
 330 **/
 331 typedef
 332 EFI_STATUS
 333 (EFIAPI *EFI_IP4_CONFIGURE)(
 334   IN EFI_IP4_PROTOCOL    *This,
 335   IN EFI_IP4_CONFIG_DATA *IpConfigData     OPTIONAL
 336   );
 337
 338 /**
 339   Joins and leaves multicast groups.
 340
 341   The Groups() function is used to join and leave multicast group sessions. Joining
 342   a group will enable reception of matching multicast packets. Leaving a group will
 343   disable the multicast packet reception.
 344
 345   If JoinFlag is FALSE and GroupAddress is NULL, all joined groups will be left.
 346
 347   @param  This                  Pointer to the EFI_IP4_PROTOCOL instance.
 348   @param  JoinFlag              Set to TRUE to join the multicast group session and FALSE to leave.
 349   @param  GroupAddress          Pointer to the IPv4 multicast address.
 350
 351   @retval EFI_SUCCESS           The operation completed successfully.
 352   @retval EFI_INVALID_PARAMETER One or more of the following is TRUE:
 353                                 - This is NULL.
 354                                 - JoinFlag is TRUE and GroupAddress is NULL.
 355                                 - GroupAddress is not NULL and *GroupAddress is
 356                                 not a multicast IPv4 address.
 357   @retval EFI_NOT_STARTED       This instance has not been started.
 358   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 359                                 RARP, etc.) is not finished yet.
 360   @retval EFI_OUT_OF_RESOURCES  System resources could not be allocated.
 361   @retval EFI_UNSUPPORTED       This EFI IPv4 Protocol implementation does not support multicast groups.
 362   @retval EFI_ALREADY_STARTED   The group address is already in the group table (when
 363                                 JoinFlag is TRUE).
 364   @retval EFI_NOT_FOUND         The group address is not in the group table (when JoinFlag is FALSE).
 365   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 366
 367 **/
 368 typedef
 369 EFI_STATUS
 370 (EFIAPI *EFI_IP4_GROUPS)(
 371   IN EFI_IP4_PROTOCOL    *This,
 372   IN BOOLEAN             JoinFlag,
 373   IN EFI_IPv4_ADDRESS    *GroupAddress  OPTIONAL
 374   );
 375
 376 /**
 377   Adds and deletes routing table entries.
 378
 379   The Routes() function adds a route to or deletes a route from the routing table.
 380
 381   Routes are determined by comparing the SubnetAddress with the destination IPv4
 382   address arithmetically AND-ed with the SubnetMask. The gateway address must be
 383   on the same subnet as the configured station address.
 384
 385   The default route is added with SubnetAddress and SubnetMask both set to 0.0.0.0.
 386   The default route matches all destination IPv4 addresses that do not match any
 387   other routes.
 388
 389   A GatewayAddress that is zero is a nonroute. Packets are sent to the destination
 390   IP address if it can be found in the ARP cache or on the local subnet. One automatic
 391   nonroute entry will be inserted into the routing table for outgoing packets that
 392   are addressed to a local subnet (gateway address of 0.0.0.0).
 393
 394   Each EFI IPv4 Protocol instance has its own independent routing table. Those EFI
 395   IPv4 Protocol instances that use the default IPv4 address will also have copies
 396   of the routing table that was provided by the EFI_IP4_CONFIG_PROTOCOL, and these
 397   copies will be updated whenever the EIF IPv4 Protocol driver reconfigures its
 398   instances. As a result, client modification to the routing table will be lost.
 399
 400   @param  This                   Pointer to the EFI_IP4_PROTOCOL instance.
 401   @param  DeleteRoute            Set to TRUE to delete this route from the routing table. Set to
 402                                  FALSE to add this route to the routing table. SubnetAddress
 403                                  and SubnetMask are used as the key to each route entry.
 404   @param  SubnetAddress          The address of the subnet that needs to be routed.
 405   @param  SubnetMask             The subnet mask of SubnetAddress.
 406   @param  GatewayAddress         The unicast gateway IPv4 address for this route.
 407
 408   @retval EFI_SUCCESS            The operation completed successfully.
 409   @retval EFI_NOT_STARTED        The driver instance has not been started.
 410   @retval EFI_NO_MAPPING         When using the default address, configuration (DHCP, BOOTP,
 411                                  RARP, etc.) is not finished yet.
 412   @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
 413                                  - This is NULL.
 414                                  - SubnetAddress is NULL.
 415                                  - SubnetMask is NULL.
 416                                  - GatewayAddress is NULL.
 417                                  - *SubnetAddress is not a valid subnet address.
 418                                  - *SubnetMask is not a valid subnet mask.
 419                                  - *GatewayAddress is not a valid unicast IPv4 address.
 420   @retval EFI_OUT_OF_RESOURCES   Could not add the entry to the routing table.
 421   @retval EFI_NOT_FOUND          This route is not in the routing table (when DeleteRoute is TRUE).
 422   @retval EFI_ACCESS_DENIED      The route is already defined in the routing table (when
 423                                   DeleteRoute is FALSE).
 424
 425 **/
 426 typedef
 427 EFI_STATUS
 428 (EFIAPI *EFI_IP4_ROUTES)(
 429   IN EFI_IP4_PROTOCOL    *This,
 430   IN BOOLEAN             DeleteRoute,
 431   IN EFI_IPv4_ADDRESS    *SubnetAddress,
 432   IN EFI_IPv4_ADDRESS    *SubnetMask,
 433   IN EFI_IPv4_ADDRESS    *GatewayAddress
 434   );
 435
 436 /**
 437   Places outgoing data packets into the transmit queue.
 438
 439   The Transmit() function places a sending request in the transmit queue of this
 440   EFI IPv4 Protocol instance. Whenever the packet in the token is sent out or some
 441   errors occur, the event in the token will be signaled and the status is updated.
 442
 443   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 444   @param  Token Pointer to the transmit token.
 445
 446   @retval  EFI_SUCCESS           The data has been queued for transmission.
 447   @retval  EFI_NOT_STARTED       This instance has not been started.
 448   @retval  EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 449                                  RARP, etc.) is not finished yet.
 450   @retval  EFI_INVALID_PARAMETER One or more pameters are invalid.
 451   @retval  EFI_ACCESS_DENIED     The transmit completion token with the same Token.Event
 452                                  was already in the transmit queue.
 453   @retval  EFI_NOT_READY         The completion token could not be queued because the transmit
 454                                  queue is full.
 455   @retval  EFI_NOT_FOUND         Not route is found to destination address.
 456   @retval  EFI_OUT_OF_RESOURCES  Could not queue the transmit data.
 457   @retval  EFI_BUFFER_TOO_SMALL  Token.Packet.TxData.TotalDataLength is too
 458                                  short to transmit.
 459   @retval  EFI_BAD_BUFFER_SIZE   The length of the IPv4 header + option length + total data length is
 460                                  greater than MTU (or greater than the maximum packet size if
 461                                  Token.Packet.TxData.OverrideData.
 462                                  DoNotFragment is TRUE.)
 463
 464 **/
 465 typedef
 466 EFI_STATUS
 467 (EFIAPI *EFI_IP4_TRANSMIT)(
 468   IN EFI_IP4_PROTOCOL          *This,
 469   IN EFI_IP4_COMPLETION_TOKEN  *Token
 470   );
 471
 472 /**
 473   Places a receiving request into the receiving queue.
 474
 475   The Receive() function places a completion token into the receive packet queue.
 476   This function is always asynchronous.
 477
 478   The Token.Event field in the completion token must be filled in by the caller
 479   and cannot be NULL. When the receive operation completes, the EFI IPv4 Protocol
 480   driver updates the Token.Status and Token.Packet.RxData fields and the Token.Event
 481   is signaled.
 482
 483   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 484   @param  Token Pointer to a token that is associated with the receive data descriptor.
 485
 486   @retval EFI_SUCCESS           The receive completion token was cached.
 487   @retval EFI_NOT_STARTED       This EFI IPv4 Protocol instance has not been started.
 488   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP, RARP, etc.)
 489                                 is not finished yet.
 490   @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
 491                                 - This is NULL.
 492                                 - Token is NULL.
 493                                 - Token.Event is NULL.
 494   @retval EFI_OUT_OF_RESOURCES  The receive completion token could not be queued due to a lack of system
 495                                 resources (usually memory).
 496   @retval EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 497                                 The EFI IPv4 Protocol instance has been reset to startup defaults.
 498                                 EFI_ACCESS_DENIED The receive completion token with the same Token.Event was already
 499                                 in the receive queue.
 500   @retval EFI_NOT_READY         The receive request could not be queued because the receive queue is full.
 501   @retval EFI_ICMP_ERROR        An ICMP error packet was received.
 502
 503 **/
 504 typedef
 505 EFI_STATUS
 506 (EFIAPI *EFI_IP4_RECEIVE)(
 507   IN EFI_IP4_PROTOCOL          *This,
 508   IN EFI_IP4_COMPLETION_TOKEN  *Token
 509   );
 510
 511 /**
 512   Abort an asynchronous transmit or receive request.
 513
 514   The Cancel() function is used to abort a pending transmit or receive request.
 515   If the token is in the transmit or receive request queues, after calling this
 516   function, Token->Status will be set to EFI_ABORTED and then Token->Event will
 517   be signaled. If the token is not in one of the queues, which usually means the
 518   asynchronous operation has completed, this function will not signal the token
 519   and EFI_NOT_FOUND is returned.
 520
 521   @param  This  Pointer to the EFI_IP4_PROTOCOL instance.
 522   @param  Token Pointer to a token that has been issued by
 523                 EFI_IP4_PROTOCOL.Transmit() or
 524                 EFI_IP4_PROTOCOL.Receive(). If NULL, all pending
 525                 tokens are aborted. Type EFI_IP4_COMPLETION_TOKEN is
 526                 defined in EFI_IP4_PROTOCOL.Transmit().
 527
 528   @retval EFI_SUCCESS           The asynchronous I/O request was aborted and
 529                                 Token.->Event was signaled. When Token is NULL, all
 530                                 pending requests were aborted and their events were signaled.
 531   @retval EFI_INVALID_PARAMETER This is NULL.
 532   @retval EFI_NOT_STARTED       This instance has not been started.
 533   @retval EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 534                                 RARP, etc.) is not finished yet.
 535   @retval EFI_NOT_FOUND         When Token is not NULL, the asynchronous I/O request was
 536                                 not found in the transmit or receive queue. It has either completed
 537                                 or was not issued by Transmit() and Receive().
 538
 539 **/
 540 typedef
 541 EFI_STATUS
 542 (EFIAPI *EFI_IP4_CANCEL)(
 543   IN EFI_IP4_PROTOCOL          *This,
 544   IN EFI_IP4_COMPLETION_TOKEN  *Token OPTIONAL
 545   );
 546
 547 /**
 548   Polls for incoming data packets and processes outgoing data packets.
 549
 550   The Poll() function polls for incoming data packets and processes outgoing data
 551   packets. Network drivers and applications can call the EFI_IP4_PROTOCOL.Poll()
 552   function to increase the rate that data packets are moved between the communications
 553   device and the transmit and receive queues.
 554
 555   In some systems the periodic timer event may not poll the underlying communications
 556   device fast enough to transmit and/or receive all data packets without missing
 557   incoming packets or dropping outgoing packets. Drivers and applications that are
 558   experiencing packet loss should try calling the EFI_IP4_PROTOCOL.Poll() function
 559   more often.
 560
 561   @param  This Pointer to the EFI_IP4_PROTOCOL instance.
 562
 563   @retval  EFI_SUCCESS           Incoming or outgoing data was processed.
 564   @retval  EFI_NOT_STARTED       This EFI IPv4 Protocol instance has not been started.
 565   @retval  EFI_NO_MAPPING        When using the default address, configuration (DHCP, BOOTP,
 566                                  RARP, etc.) is not finished yet.
 567   @retval  EFI_INVALID_PARAMETER This is NULL.
 568   @retval  EFI_DEVICE_ERROR      An unexpected system or network error occurred.
 569   @retval  EFI_NOT_READY         No incoming or outgoing data is processed.
 570   @retval  EFI_TIMEOUT           Data was dropped out of the transmit and/or receive queue.
 571                                  Consider increasing the polling rate.
 572
 573 **/
 574 typedef
 575 EFI_STATUS
 576 (EFIAPI *EFI_IP4_POLL)(
 577   IN EFI_IP4_PROTOCOL          *This
 578   );
 579
 580 ///
 581 /// The EFI IPv4 Protocol implements a simple packet-oriented interface that can be
 582 /// used by drivers, daemons, and applications to transmit and receive network packets.
 583 ///
 584 struct _EFI_IP4_PROTOCOL {
 585   EFI_IP4_GET_MODE_DATA        GetModeData;
 586   EFI_IP4_CONFIGURE            Configure;
 587   EFI_IP4_GROUPS               Groups;
 588   EFI_IP4_ROUTES               Routes;
 589   EFI_IP4_TRANSMIT             Transmit;
 590   EFI_IP4_RECEIVE              Receive;
 591   EFI_IP4_CANCEL               Cancel;
 592   EFI_IP4_POLL                 Poll;
 593 };
 594
 595 extern EFI_GUID gEfiIp4ServiceBindingProtocolGuid;
 596 extern EFI_GUID gEfiIp4ProtocolGuid;
 597
 598 #endif