InOsEmuPkg/Unix/Sec/LinuxPacketFilter.c

   1 /**@file
   2  Linux Packet Filter implementation of the EMU_SNP_PROTOCOL that allows the
   3  emulator to get on real networks.
   4
   5  Currently only the Berkeley Packet Filter is fully implemented and this file
   6  is just a template that needs to get filled in.
   7
   8 Copyright (c) 2004 - 2009, Intel Corporation. All rights reserved.<BR>
   9 Portitions copyright (c) 2011, Apple Inc. All rights reserved.
  10
  11 This program and the accompanying materials
  12 are licensed and made available under the terms and conditions of the BSD License
  13 which accompanies this distribution.  The full text of the license may be found at
  14 http://opensource.org/licenses/bsd-license.php
  15
  16 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  17 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  18
  19 **/
  20
  21
  22 #include "SecMain.h"
  23
  24 #ifndef __APPLE__
  25
  26 #define EMU_SNP_PRIVATE_SIGNATURE SIGNATURE_32('E', 'M', 's', 'n')
  27 typedef struct {
  28   UINTN                       Signature;
  29
  30   EMU_IO_THUNK_PROTOCOL       *Thunk;
  31
  32
  33   EMU_SNP_PROTOCOL            EmuSnp;
  34   EFI_SIMPLE_NETWORK_MODE     *Mode;
  35
  36 } EMU_SNP_PRIVATE;
  37
  38 #define EMU_SNP_PRIVATE_DATA_FROM_THIS(a) \
  39          CR(a, EMU_SNP_PRIVATE, EmuSnp, EMU_SNP_PRIVATE_SIGNATURE)
  40
  41 /**
  42   Register storage for SNP Mode.
  43
  44   @param  This Protocol instance pointer.
  45   @param  Mode SimpleNetworkProtocol Mode structure passed into driver.
  46
  47   @retval EFI_SUCCESS           The network interface was started.
  48   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  49
  50 **/
  51 EFI_STATUS
  52 EmuSnpCreateMapping (
  53   IN     EMU_SNP_PROTOCOL         *This,
  54   IN     EFI_SIMPLE_NETWORK_MODE  *Mode
  55   )
  56 {
  57   EMU_SNP_PRIVATE    *Private;
  58
  59   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
  60
  61   Private->Mode = Mode;
  62
  63   return EFI_SUCCESS;
  64 }
  65
  66 /**
  67   Changes the state of a network interface from "stopped" to "started".
  68
  69   @param  This Protocol instance pointer.
  70
  71   @retval EFI_SUCCESS           The network interface was started.
  72   @retval EFI_ALREADY_STARTED   The network interface is already in the started state.
  73   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  74   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  75   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
  76
  77 **/
  78 EFI_STATUS
  79 EmuSnpStart (
  80   IN EMU_SNP_PROTOCOL  *This
  81   )
  82 {
  83   EMU_SNP_PRIVATE    *Private;
  84
  85   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
  86
  87   return EFI_UNSUPPORTED;
  88 }
  89
  90 /**
  91   Changes the state of a network interface from "started" to "stopped".
  92
  93   @param  This Protocol instance pointer.
  94
  95   @retval EFI_SUCCESS           The network interface was stopped.
  96   @retval EFI_ALREADY_STARTED   The network interface is already in the stopped state.
  97   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
  98   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
  99   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 100
 101 **/
 102 EFI_STATUS
 103 EmuSnpStop (
 104   IN EMU_SNP_PROTOCOL  *This
 105   )
 106 {
 107   EMU_SNP_PRIVATE    *Private;
 108
 109   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 110
 111   return EFI_UNSUPPORTED;
 112 }
 113
 114 /**
 115   Resets a network adapter and allocates the transmit and receive buffers
 116   required by the network interface; optionally, also requests allocation
 117   of additional transmit and receive buffers.
 118
 119   @param  This              The protocol instance pointer.
 120   @param  ExtraRxBufferSize The size, in bytes, of the extra receive buffer space
 121                             that the driver should allocate for the network interface.
 122                             Some network interfaces will not be able to use the extra
 123                             buffer, and the caller will not know if it is actually
 124                             being used.
 125   @param  ExtraTxBufferSize The size, in bytes, of the extra transmit buffer space
 126                             that the driver should allocate for the network interface.
 127                             Some network interfaces will not be able to use the extra
 128                             buffer, and the caller will not know if it is actually
 129                             being used.
 130
 131   @retval EFI_SUCCESS           The network interface was initialized.
 132   @retval EFI_NOT_STARTED       The network interface has not been started.
 133   @retval EFI_OUT_OF_RESOURCES  There was not enough memory for the transmit and
 134                                 receive buffers.
 135   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 136   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 137   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 138
 139 **/
 140 EFI_STATUS
 141 EmuSnpInitialize (
 142   IN EMU_SNP_PROTOCOL                    *This,
 143   IN UINTN                               ExtraRxBufferSize  OPTIONAL,
 144   IN UINTN                               ExtraTxBufferSize  OPTIONAL
 145   )
 146 {
 147   EMU_SNP_PRIVATE    *Private;
 148
 149   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 150
 151   return EFI_UNSUPPORTED;
 152 }
 153
 154 /**
 155   Resets a network adapter and re-initializes it with the parameters that were
 156   provided in the previous call to Initialize().
 157
 158   @param  This                 The protocol instance pointer.
 159   @param  ExtendedVerification Indicates that the driver may perform a more
 160                                exhaustive verification operation of the device
 161                                during reset.
 162
 163   @retval EFI_SUCCESS           The network interface was reset.
 164   @retval EFI_NOT_STARTED       The network interface has not been started.
 165   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 166   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 167   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 168
 169 **/
 170 EFI_STATUS
 171 EmuSnpReset (
 172   IN EMU_SNP_PROTOCOL   *This,
 173   IN BOOLEAN            ExtendedVerification
 174   )
 175 {
 176   EMU_SNP_PRIVATE    *Private;
 177
 178   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 179
 180   return EFI_UNSUPPORTED;
 181 }
 182
 183 /**
 184   Resets a network adapter and leaves it in a state that is safe for
 185   another driver to initialize.
 186
 187   @param  This Protocol instance pointer.
 188
 189   @retval EFI_SUCCESS           The network interface was shutdown.
 190   @retval EFI_NOT_STARTED       The network interface has not been started.
 191   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 192   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 193   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 194
 195 **/
 196 EFI_STATUS
 197 EmuSnpShutdown (
 198   IN EMU_SNP_PROTOCOL  *This
 199   )
 200 {
 201   EMU_SNP_PRIVATE    *Private;
 202
 203   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 204
 205   return EFI_UNSUPPORTED;
 206 }
 207
 208 /**
 209   Manages the multicast receive filters of a network interface.
 210
 211   @param  This             The protocol instance pointer.
 212   @param  Enable           A bit mask of receive filters to enable on the network interface.
 213   @param  Disable          A bit mask of receive filters to disable on the network interface.
 214   @param  ResetMCastFilter Set to TRUE to reset the contents of the multicast receive
 215                            filters on the network interface to their default values.
 216   @param  McastFilterCnt   Number of multicast HW MAC addresses in the new
 217                            MCastFilter list. This value must be less than or equal to
 218                            the MCastFilterCnt field of EMU_SNP_MODE. This
 219                            field is optional if ResetMCastFilter is TRUE.
 220   @param  MCastFilter      A pointer to a list of new multicast receive filter HW MAC
 221                            addresses. This list will replace any existing multicast
 222                            HW MAC address list. This field is optional if
 223                            ResetMCastFilter is TRUE.
 224
 225   @retval EFI_SUCCESS           The multicast receive filter list was updated.
 226   @retval EFI_NOT_STARTED       The network interface has not been started.
 227   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 228   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 229   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 230
 231 **/
 232 EFI_STATUS
 233 EmuSnpReceiveFilters (
 234   IN EMU_SNP_PROTOCOL                             *This,
 235   IN UINT32                                       Enable,
 236   IN UINT32                                       Disable,
 237   IN BOOLEAN                                      ResetMCastFilter,
 238   IN UINTN                                        MCastFilterCnt     OPTIONAL,
 239   IN EFI_MAC_ADDRESS                              *MCastFilter OPTIONAL
 240   )
 241 {
 242   EMU_SNP_PRIVATE    *Private;
 243
 244   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 245
 246   return EFI_UNSUPPORTED;
 247 }
 248
 249 /**
 250   Modifies or resets the current station address, if supported.
 251
 252   @param  This  The protocol instance pointer.
 253   @param  Reset Flag used to reset the station address to the network interfaces
 254                 permanent address.
 255   @param  New   The new station address to be used for the network interface.
 256
 257   @retval EFI_SUCCESS           The network interfaces station address was updated.
 258   @retval EFI_NOT_STARTED       The network interface has not been started.
 259   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 260   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 261   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 262
 263 **/
 264 EFI_STATUS
 265 EmuSnpStationAddress (
 266   IN EMU_SNP_PROTOCOL            *This,
 267   IN BOOLEAN                     Reset,
 268   IN EFI_MAC_ADDRESS             *New OPTIONAL
 269   )
 270 {
 271   EMU_SNP_PRIVATE    *Private;
 272
 273   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 274
 275   return EFI_UNSUPPORTED;
 276 }
 277
 278 /**
 279   Resets or collects the statistics on a network interface.
 280
 281   @param  This            Protocol instance pointer.
 282   @param  Reset           Set to TRUE to reset the statistics for the network interface.
 283   @param  StatisticsSize  On input the size, in bytes, of StatisticsTable. On
 284                           output the size, in bytes, of the resulting table of
 285                           statistics.
 286   @param  StatisticsTable A pointer to the EFI_NETWORK_STATISTICS structure that
 287                           contains the statistics.
 288
 289   @retval EFI_SUCCESS           The statistics were collected from the network interface.
 290   @retval EFI_NOT_STARTED       The network interface has not been started.
 291   @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
 292                                 size needed to hold the statistics is returned in
 293                                 StatisticsSize.
 294   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 295   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 296   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 297
 298 **/
 299 EFI_STATUS
 300 EmuSnpStatistics (
 301   IN EMU_SNP_PROTOCOL                     *This,
 302   IN BOOLEAN                              Reset,
 303   IN OUT UINTN                            *StatisticsSize   OPTIONAL,
 304   OUT EFI_NETWORK_STATISTICS              *StatisticsTable  OPTIONAL
 305   )
 306 {
 307   EMU_SNP_PRIVATE    *Private;
 308
 309   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 310
 311   return EFI_UNSUPPORTED;
 312 }
 313
 314 /**
 315   Converts a multicast IP address to a multicast HW MAC address.
 316
 317   @param  This The protocol instance pointer.
 318   @param  IPv6 Set to TRUE if the multicast IP address is IPv6 [RFC 2460]. Set
 319                to FALSE if the multicast IP address is IPv4 [RFC 791].
 320   @param  IP   The multicast IP address that is to be converted to a multicast
 321                HW MAC address.
 322   @param  MAC  The multicast HW MAC address that is to be generated from IP.
 323
 324   @retval EFI_SUCCESS           The multicast IP address was mapped to the multicast
 325                                 HW MAC address.
 326   @retval EFI_NOT_STARTED       The network interface has not been started.
 327   @retval EFI_BUFFER_TOO_SMALL  The Statistics buffer was too small. The current buffer
 328                                 size needed to hold the statistics is returned in
 329                                 StatisticsSize.
 330   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 331   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 332   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 333
 334 **/
 335 EFI_STATUS
 336 EmuSnpMCastIpToMac (
 337   IN EMU_SNP_PROTOCOL                     *This,
 338   IN BOOLEAN                              IPv6,
 339   IN EFI_IP_ADDRESS                       *IP,
 340   OUT EFI_MAC_ADDRESS                     *MAC
 341   )
 342 {
 343   EMU_SNP_PRIVATE    *Private;
 344
 345   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 346
 347   return EFI_UNSUPPORTED;
 348 }
 349
 350 /**
 351   Performs read and write operations on the NVRAM device attached to a
 352   network interface.
 353
 354   @param  This       The protocol instance pointer.
 355   @param  ReadWrite  TRUE for read operations, FALSE for write operations.
 356   @param  Offset     Byte offset in the NVRAM device at which to start the read or
 357                      write operation. This must be a multiple of NvRamAccessSize and
 358                      less than NvRamSize.
 359   @param  BufferSize The number of bytes to read or write from the NVRAM device.
 360                      This must also be a multiple of NvramAccessSize.
 361   @param  Buffer     A pointer to the data buffer.
 362
 363   @retval EFI_SUCCESS           The NVRAM access was performed.
 364   @retval EFI_NOT_STARTED       The network interface has not been started.
 365   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 366   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 367   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 368
 369 **/
 370 EFI_STATUS
 371 EmuSnpNvData (
 372   IN EMU_SNP_PROTOCOL                     *This,
 373   IN BOOLEAN                              ReadWrite,
 374   IN UINTN                                Offset,
 375   IN UINTN                                BufferSize,
 376   IN OUT VOID                             *Buffer
 377   )
 378 {
 379   EMU_SNP_PRIVATE    *Private;
 380
 381   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 382
 383   return EFI_UNSUPPORTED;
 384 }
 385
 386 /**
 387   Reads the current interrupt status and recycled transmit buffer status from
 388   a network interface.
 389
 390   @param  This            The protocol instance pointer.
 391   @param  InterruptStatus A pointer to the bit mask of the currently active interrupts
 392                           If this is NULL, the interrupt status will not be read from
 393                           the device. If this is not NULL, the interrupt status will
 394                           be read from the device. When the  interrupt status is read,
 395                           it will also be cleared. Clearing the transmit  interrupt
 396                           does not empty the recycled transmit buffer array.
 397   @param  TxBuf           Recycled transmit buffer address. The network interface will
 398                           not transmit if its internal recycled transmit buffer array
 399                           is full. Reading the transmit buffer does not clear the
 400                           transmit interrupt. If this is NULL, then the transmit buffer
 401                           status will not be read. If there are no transmit buffers to
 402                           recycle and TxBuf is not NULL, * TxBuf will be set to NULL.
 403
 404   @retval EFI_SUCCESS           The status of the network interface was retrieved.
 405   @retval EFI_NOT_STARTED       The network interface has not been started.
 406   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 407   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 408   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 409
 410 **/
 411 EFI_STATUS
 412 EmuSnpGetStatus (
 413   IN EMU_SNP_PROTOCOL                     *This,
 414   OUT UINT32                              *InterruptStatus OPTIONAL,
 415   OUT VOID                                **TxBuf OPTIONAL
 416   )
 417 {
 418   EMU_SNP_PRIVATE    *Private;
 419
 420   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 421
 422   return EFI_UNSUPPORTED;
 423 }
 424
 425 /**
 426   Places a packet in the transmit queue of a network interface.
 427
 428   @param  This       The protocol instance pointer.
 429   @param  HeaderSize The size, in bytes, of the media header to be filled in by
 430                      the Transmit() function. If HeaderSize is non-zero, then it
 431                      must be equal to This->Mode->MediaHeaderSize and the DestAddr
 432                      and Protocol parameters must not be NULL.
 433   @param  BufferSize The size, in bytes, of the entire packet (media header and
 434                      data) to be transmitted through the network interface.
 435   @param  Buffer     A pointer to the packet (media header followed by data) to be
 436                      transmitted. This parameter cannot be NULL. If HeaderSize is zero,
 437                      then the media header in Buffer must already be filled in by the
 438                      caller. If HeaderSize is non-zero, then the media header will be
 439                      filled in by the Transmit() function.
 440   @param  SrcAddr    The source HW MAC address. If HeaderSize is zero, then this parameter
 441                      is ignored. If HeaderSize is non-zero and SrcAddr is NULL, then
 442                      This->Mode->CurrentAddress is used for the source HW MAC address.
 443   @param  DestAddr   The destination HW MAC address. If HeaderSize is zero, then this
 444                      parameter is ignored.
 445   @param  Protocol   The type of header to build. If HeaderSize is zero, then this
 446                      parameter is ignored. See RFC 1700, section "Ether Types", for
 447                      examples.
 448
 449   @retval EFI_SUCCESS           The packet was placed on the transmit queue.
 450   @retval EFI_NOT_STARTED       The network interface has not been started.
 451   @retval EFI_NOT_READY         The network interface is too busy to accept this transmit request.
 452   @retval EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
 453   @retval EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 454   @retval EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 455   @retval EFI_UNSUPPORTED       This function is not supported by the network interface.
 456
 457 **/
 458 EFI_STATUS
 459 EmuSnpTransmit (
 460   IN EMU_SNP_PROTOCOL                     *This,
 461   IN UINTN                                HeaderSize,
 462   IN UINTN                                BufferSize,
 463   IN VOID                                 *Buffer,
 464   IN EFI_MAC_ADDRESS                      *SrcAddr  OPTIONAL,
 465   IN EFI_MAC_ADDRESS                      *DestAddr OPTIONAL,
 466   IN UINT16                               *Protocol OPTIONAL
 467   )
 468 {
 469   EMU_SNP_PRIVATE    *Private;
 470
 471   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 472
 473   return EFI_UNSUPPORTED;
 474 }
 475
 476 /**
 477   Receives a packet from a network interface.
 478
 479   @param  This       The protocol instance pointer.
 480   @param  HeaderSize The size, in bytes, of the media header received on the network
 481                      interface. If this parameter is NULL, then the media header size
 482                      will not be returned.
 483   @param  BufferSize On entry, the size, in bytes, of Buffer. On exit, the size, in
 484                      bytes, of the packet that was received on the network interface.
 485   @param  Buffer     A pointer to the data buffer to receive both the media header and
 486                      the data.
 487   @param  SrcAddr    The source HW MAC address. If this parameter is NULL, the
 488                      HW MAC source address will not be extracted from the media
 489                      header.
 490   @param  DestAddr   The destination HW MAC address. If this parameter is NULL,
 491                      the HW MAC destination address will not be extracted from the
 492                      media header.
 493   @param  Protocol   The media header type. If this parameter is NULL, then the
 494                      protocol will not be extracted from the media header. See
 495                      RFC 1700 section "Ether Types" for examples.
 496
 497   @retval  EFI_SUCCESS           The received data was stored in Buffer, and BufferSize has
 498                                  been updated to the number of bytes received.
 499   @retval  EFI_NOT_STARTED       The network interface has not been started.
 500   @retval  EFI_NOT_READY         The network interface is too busy to accept this transmit
 501                                  request.
 502   @retval  EFI_BUFFER_TOO_SMALL  The BufferSize parameter is too small.
 503   @retval  EFI_INVALID_PARAMETER One or more of the parameters has an unsupported value.
 504   @retval  EFI_DEVICE_ERROR      The command could not be sent to the network interface.
 505   @retval  EFI_UNSUPPORTED       This function is not supported by the network interface.
 506
 507 **/
 508 EFI_STATUS
 509 EmuSnpReceive (
 510   IN EMU_SNP_PROTOCOL                     *This,
 511   OUT UINTN                               *HeaderSize OPTIONAL,
 512   IN OUT UINTN                            *BufferSize,
 513   OUT VOID                                *Buffer,
 514   OUT EFI_MAC_ADDRESS                     *SrcAddr    OPTIONAL,
 515   OUT EFI_MAC_ADDRESS                     *DestAddr   OPTIONAL,
 516   OUT UINT16                              *Protocol   OPTIONAL
 517   )
 518 {
 519   EMU_SNP_PRIVATE    *Private;
 520
 521   Private = EMU_SNP_PRIVATE_DATA_FROM_THIS (This);
 522
 523   return EFI_UNSUPPORTED;
 524 }
 525
 526
 527 EMU_SNP_PROTOCOL gEmuSnpProtocol = {
 528   GasketSnpCreateMapping,
 529   GasketSnpStart,
 530   GasketSnpStop,
 531   GasketSnpInitialize,
 532   GasketSnpReset,
 533   GasketSnpShutdown,
 534   GasketSnpReceiveFilters,
 535   GasketSnpStationAddress,
 536   GasketSnpStatistics,
 537   GasketSnpMCastIpToMac,
 538   GasketSnpNvData,
 539   GasketSnpGetStatus,
 540   GasketSnpTransmit,
 541   GasketSnpReceive
 542 };
 543
 544 EFI_STATUS
 545 EmuSnpThunkOpen (
 546   IN  EMU_IO_THUNK_PROTOCOL   *This
 547   )
 548 {
 549   EMU_SNP_PRIVATE  *Private;
 550
 551   if (This->Private != NULL) {
 552     return EFI_ALREADY_STARTED;
 553   }
 554
 555   if (!CompareGuid (This->Protocol, &gEmuSnpProtocolGuid)) {
 556     return EFI_UNSUPPORTED;
 557   }
 558
 559   Private = malloc (sizeof (EMU_SNP_PRIVATE));
 560   if (Private == NULL) {
 561     return EFI_OUT_OF_RESOURCES;
 562   }
 563
 564
 565   Private->Signature = EMU_SNP_PRIVATE_SIGNATURE;
 566   Private->Thunk     = This;
 567   CopyMem (&Private->EmuSnp, &gEmuSnpProtocol, sizeof (gEmuSnpProtocol));
 568
 569   This->Interface = &Private->EmuSnp;
 570   This->Private   = Private;
 571   return EFI_SUCCESS;
 572 }
 573
 574
 575 EFI_STATUS
 576 EmuSnpThunkClose (
 577   IN  EMU_IO_THUNK_PROTOCOL   *This
 578   )
 579 {
 580   EMU_SNP_PRIVATE  *Private;
 581
 582   if (!CompareGuid (This->Protocol, &gEmuSnpProtocolGuid)) {
 583     return EFI_UNSUPPORTED;
 584   }
 585
 586   Private = This->Private;
 587   free (Private);
 588
 589   return EFI_SUCCESS;
 590 }
 591
 592
 593
 594 EMU_IO_THUNK_PROTOCOL gSnpThunkIo = {
 595   &gEmuSnpProtocolGuid,
 596   NULL,
 597   NULL,
 598   0,
 599   GasketSnpThunkOpen,
 600   GasketSnpThunkClose,
 601   NULL
 602 };
 603
 604 #endif