MdeModulePkg/Universal/Network/Ip4Dxe/Ip4Config2Impl.c

   1 /** @file
   2   The implementation of EFI IPv4 Configuration II Protocol.
   3
   4   Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR>
   5   (C) Copyright 2015-2016 Hewlett Packard Enterprise Development LP<BR>
   6
   7   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php.
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17 #include "Ip4Impl.h"
  18
  19 LIST_ENTRY  mIp4Config2InstanceList = {&mIp4Config2InstanceList, &mIp4Config2InstanceList};
  20
  21 /**
  22   The event process routine when the DHCPv4 service binding protocol is installed
  23   in the system.
  24
  25   @param[in]     Event         Not used.
  26   @param[in]     Context       Pointer to the IP4 config2 instance data.
  27
  28 **/
  29 VOID
  30 EFIAPI
  31 Ip4Config2OnDhcp4SbInstalled (
  32   IN EFI_EVENT  Event,
  33   IN VOID       *Context
  34   );
  35
  36 /**
  37   Destroy the Dhcp4 child in IP4_CONFIG2_INSTANCE and release the resources.
  38
  39   @param[in, out] Instance    The buffer of IP4 config2 instance to be freed.
  40
  41   @retval EFI_SUCCESS         The child was successfully destroyed.
  42   @retval Others              Failed to destroy the child.
  43
  44 **/
  45 EFI_STATUS
  46 Ip4Config2DestroyDhcp4 (
  47   IN OUT IP4_CONFIG2_INSTANCE  *Instance
  48   )
  49 {
  50   IP4_SERVICE                 *IpSb;
  51   EFI_STATUS                  Status;
  52   EFI_DHCP4_PROTOCOL          *Dhcp4;
  53
  54   Dhcp4 = Instance->Dhcp4;
  55   ASSERT (Dhcp4 != NULL);
  56
  57   Dhcp4->Stop (Dhcp4);
  58   Dhcp4->Configure (Dhcp4, NULL);
  59   Instance->Dhcp4 = NULL;
  60
  61   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
  62
  63   //
  64   // Close DHCPv4 protocol and destroy the child.
  65   //
  66   Status = gBS->CloseProtocol (
  67                   Instance->Dhcp4Handle,
  68                   &gEfiDhcp4ProtocolGuid,
  69                   IpSb->Image,
  70                   IpSb->Controller
  71                   );
  72   if (EFI_ERROR (Status)) {
  73     return Status;
  74   }
  75
  76   Status = NetLibDestroyServiceChild (
  77              IpSb->Controller,
  78              IpSb->Image,
  79              &gEfiDhcp4ServiceBindingProtocolGuid,
  80              Instance->Dhcp4Handle
  81              );
  82
  83   Instance->Dhcp4Handle = NULL;
  84
  85   return Status;
  86 }
  87
  88 /**
  89   Update the current policy to NewPolicy. During the transition
  90   period, the default router list
  91   and address list in all interfaces will be released.
  92
  93   @param[in]  IpSb               The IP4 service binding instance.
  94   @param[in]  NewPolicy          The new policy to be updated to.
  95
  96 **/
  97 VOID
  98 Ip4Config2OnPolicyChanged (
  99   IN IP4_SERVICE            *IpSb,
 100   IN EFI_IP4_CONFIG2_POLICY NewPolicy
 101   )
 102 {
 103   IP4_INTERFACE   *IpIf;
 104   IP4_ROUTE_TABLE *RouteTable;
 105
 106   //
 107   // Currently there are only two policies: static and dhcp. Regardless of
 108   // what transition is going on, i.e., static -> dhcp and dhcp ->
 109   // static, we have to free default router table and all addresses.
 110   //
 111
 112   if (IpSb->DefaultInterface != NULL) {
 113     if (IpSb->DefaultRouteTable != NULL) {
 114       Ip4FreeRouteTable (IpSb->DefaultRouteTable);
 115       IpSb->DefaultRouteTable = NULL;
 116     }
 117
 118     Ip4CancelReceive (IpSb->DefaultInterface);
 119
 120     Ip4FreeInterface (IpSb->DefaultInterface, NULL);
 121     IpSb->DefaultInterface = NULL;
 122   }
 123
 124   Ip4CleanAssembleTable (&IpSb->Assemble);
 125
 126   //
 127   // Create new default interface and route table.
 128   //
 129   IpIf = Ip4CreateInterface (IpSb->Mnp, IpSb->Controller, IpSb->Image);
 130   if (IpIf == NULL) {
 131     return ;
 132   }
 133
 134   RouteTable = Ip4CreateRouteTable ();
 135   if (RouteTable == NULL) {
 136     Ip4FreeInterface (IpIf, NULL);
 137     return ;
 138   }
 139
 140   IpSb->DefaultInterface  = IpIf;
 141   InsertHeadList (&IpSb->Interfaces, &IpIf->Link);
 142   IpSb->DefaultRouteTable = RouteTable;
 143   Ip4ReceiveFrame (IpIf, NULL, Ip4AccpetFrame, IpSb);
 144
 145   if (IpSb->State == IP4_SERVICE_CONFIGED || IpSb->State == IP4_SERVICE_STARTED) {
 146     IpSb->State = IP4_SERVICE_UNSTARTED;
 147   }
 148
 149   //
 150   // Start the dhcp configuration.
 151   //
 152   if (NewPolicy == Ip4Config2PolicyDhcp) {
 153     Ip4StartAutoConfig (&IpSb->Ip4Config2Instance);
 154   }
 155
 156 }
 157
 158 /**
 159   Signal the registered event. It is the callback routine for NetMapIterate.
 160
 161   @param[in]  Map    Points to the list of registered event.
 162   @param[in]  Item   The registered event.
 163   @param[in]  Arg    Not used.
 164
 165   @retval EFI_SUCCESS           The event was signaled successfully.
 166 **/
 167 EFI_STATUS
 168 EFIAPI
 169 Ip4Config2SignalEvent (
 170   IN NET_MAP                *Map,
 171   IN NET_MAP_ITEM           *Item,
 172   IN VOID                   *Arg
 173   )
 174 {
 175   gBS->SignalEvent ((EFI_EVENT) Item->Key);
 176
 177   return EFI_SUCCESS;
 178 }
 179
 180 /**
 181   Read the configuration data from variable storage according to the VarName and
 182   gEfiIp4Config2ProtocolGuid. It checks the integrity of variable data. If the
 183   data is corrupted, it clears the variable data to ZERO. Othewise, it outputs the
 184   configuration data to IP4_CONFIG2_INSTANCE.
 185
 186   @param[in]      VarName       The pointer to the variable name
 187   @param[in, out] Instance      The pointer to the IP4 config2 instance data.
 188
 189   @retval EFI_NOT_FOUND         The variable can not be found or already corrupted.
 190   @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the operation.
 191   @retval EFI_SUCCESS           The configuration data was retrieved successfully.
 192
 193 **/
 194 EFI_STATUS
 195 Ip4Config2ReadConfigData (
 196   IN     CHAR16               *VarName,
 197   IN OUT IP4_CONFIG2_INSTANCE *Instance
 198   )
 199 {
 200   EFI_STATUS              Status;
 201   UINTN                   VarSize;
 202   IP4_CONFIG2_VARIABLE    *Variable;
 203   IP4_CONFIG2_DATA_ITEM   *DataItem;
 204   UINTN                   Index;
 205   IP4_CONFIG2_DATA_RECORD DataRecord;
 206   CHAR8                   *Data;
 207
 208   //
 209   // Try to read the configuration variable.
 210   //
 211   VarSize = 0;
 212   Status  = gRT->GetVariable (
 213                    VarName,
 214                    &gEfiIp4Config2ProtocolGuid,
 215                    NULL,
 216                    &VarSize,
 217                    NULL
 218                    );
 219
 220   if (Status == EFI_BUFFER_TOO_SMALL) {
 221     //
 222     // Allocate buffer and read the config variable.
 223     //
 224     Variable = AllocatePool (VarSize);
 225     if (Variable == NULL) {
 226       return EFI_OUT_OF_RESOURCES;
 227     }
 228
 229     Status = gRT->GetVariable (
 230                     VarName,
 231                     &gEfiIp4Config2ProtocolGuid,
 232                     NULL,
 233                     &VarSize,
 234                     Variable
 235                     );
 236     if (EFI_ERROR (Status) || (UINT16) (~NetblockChecksum ((UINT8 *) Variable, (UINT32) VarSize)) != 0) {
 237       //
 238       // GetVariable still error or the variable is corrupted.
 239       // Fall back to the default value.
 240       //
 241       FreePool (Variable);
 242
 243       //
 244       // Remove the problematic variable and return EFI_NOT_FOUND, a new
 245       // variable will be set again.
 246       //
 247       gRT->SetVariable (
 248              VarName,
 249              &gEfiIp4Config2ProtocolGuid,
 250              IP4_CONFIG2_VARIABLE_ATTRIBUTE,
 251              0,
 252              NULL
 253              );
 254
 255       return EFI_NOT_FOUND;
 256     }
 257
 258
 259     for (Index = 0; Index < Variable->DataRecordCount; Index++) {
 260
 261       CopyMem (&DataRecord, &Variable->DataRecord[Index], sizeof (DataRecord));
 262
 263       DataItem = &Instance->DataItem[DataRecord.DataType];
 264       if (DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED) &&
 265           (DataItem->DataSize != DataRecord.DataSize)
 266           ) {
 267         //
 268         // Perhaps a corrupted data record...
 269         //
 270         continue;
 271       }
 272
 273       if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED)) {
 274         //
 275         // This data item has variable length data.
 276         //
 277         DataItem->Data.Ptr = AllocatePool (DataRecord.DataSize);
 278         if (DataItem->Data.Ptr == NULL) {
 279           //
 280           // no memory resource
 281           //
 282           continue;
 283         }
 284       }
 285
 286       Data = (CHAR8 *) Variable + DataRecord.Offset;
 287       CopyMem (DataItem->Data.Ptr, Data, DataRecord.DataSize);
 288
 289       DataItem->DataSize = DataRecord.DataSize;
 290       DataItem->Status   = EFI_SUCCESS;
 291     }
 292
 293     FreePool (Variable);
 294     return EFI_SUCCESS;
 295   }
 296
 297   return Status;
 298 }
 299
 300 /**
 301   Write the configuration data from IP4_CONFIG2_INSTANCE to variable storage.
 302
 303   @param[in]      VarName       The pointer to the variable name.
 304   @param[in]      Instance      The pointer to the IP4 config2 instance data.
 305
 306   @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the operation.
 307   @retval EFI_SUCCESS           The configuration data is written successfully.
 308
 309 **/
 310 EFI_STATUS
 311 Ip4Config2WriteConfigData (
 312   IN CHAR16               *VarName,
 313   IN IP4_CONFIG2_INSTANCE *Instance
 314   )
 315 {
 316   UINTN                   Index;
 317   UINTN                   VarSize;
 318   IP4_CONFIG2_DATA_ITEM   *DataItem;
 319   IP4_CONFIG2_VARIABLE    *Variable;
 320   IP4_CONFIG2_DATA_RECORD *DataRecord;
 321   CHAR8                   *Heap;
 322   EFI_STATUS              Status;
 323
 324   VarSize = sizeof (IP4_CONFIG2_VARIABLE) - sizeof (IP4_CONFIG2_DATA_RECORD);
 325
 326   for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
 327
 328     DataItem = &Instance->DataItem[Index];
 329     if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_VOLATILE) && !EFI_ERROR (DataItem->Status)) {
 330
 331       VarSize += sizeof (IP4_CONFIG2_DATA_RECORD) + DataItem->DataSize;
 332     }
 333   }
 334
 335   Variable = AllocatePool (VarSize);
 336   if (Variable == NULL) {
 337     return EFI_OUT_OF_RESOURCES;
 338   }
 339
 340   Heap                      = (CHAR8 *) Variable + VarSize;
 341   Variable->DataRecordCount = 0;
 342
 343   for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
 344
 345     DataItem = &Instance->DataItem[Index];
 346     if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_VOLATILE) && !EFI_ERROR (DataItem->Status)) {
 347
 348       Heap -= DataItem->DataSize;
 349       CopyMem (Heap, DataItem->Data.Ptr, DataItem->DataSize);
 350
 351       DataRecord           = &Variable->DataRecord[Variable->DataRecordCount];
 352       DataRecord->DataType = (EFI_IP4_CONFIG2_DATA_TYPE) Index;
 353       DataRecord->DataSize = (UINT32) DataItem->DataSize;
 354       DataRecord->Offset   = (UINT16) (Heap - (CHAR8 *) Variable);
 355
 356       Variable->DataRecordCount++;
 357     }
 358   }
 359
 360   Variable->Checksum = 0;
 361   Variable->Checksum = (UINT16) ~NetblockChecksum ((UINT8 *) Variable, (UINT32) VarSize);
 362
 363   Status = gRT->SetVariable (
 364                   VarName,
 365                   &gEfiIp4Config2ProtocolGuid,
 366                   IP4_CONFIG2_VARIABLE_ATTRIBUTE,
 367                   VarSize,
 368                   Variable
 369                   );
 370
 371   FreePool (Variable);
 372
 373   return Status;
 374 }
 375
 376
 377 /**
 378   Build a EFI_IP4_ROUTE_TABLE to be returned to the caller of GetModeData.
 379   The EFI_IP4_ROUTE_TABLE is clumsy to use in the internal operation of the
 380   IP4 driver.
 381
 382   @param[in]   IpSb        The IP4 service binding instance.
 383   @param[out]  Table       The built IP4 route table.
 384
 385   @retval EFI_SUCCESS           The route table is successfully build
 386   @retval EFI_NOT_FOUND         Failed to allocate the memory for the rotue table.
 387
 388 **/
 389 EFI_STATUS
 390 Ip4Config2BuildDefaultRouteTable (
 391   IN  IP4_SERVICE               *IpSb,
 392   OUT EFI_IP4_ROUTE_TABLE       *Table
 393   )
 394 {
 395   LIST_ENTRY                *Entry;
 396   IP4_ROUTE_ENTRY           *RtEntry;
 397   UINT32                    Count;
 398   INT32                     Index;
 399
 400   if (IpSb->DefaultRouteTable == NULL) {
 401     return EFI_NOT_FOUND;
 402   }
 403
 404   Count = IpSb->DefaultRouteTable->TotalNum;
 405
 406   if (Count == 0) {
 407     return EFI_NOT_FOUND;
 408   }
 409
 410   //
 411   // Copy the route entry to EFI route table. Keep the order of
 412   // route entry copied from most specific to default route. That
 413   // is, interlevel the route entry from the instance's route area
 414   // and those from the default route table's route area.
 415   //
 416   Count = 0;
 417
 418   for (Index = IP4_MASK_MAX; Index >= 0; Index--) {
 419
 420     NET_LIST_FOR_EACH (Entry, &(IpSb->DefaultRouteTable->RouteArea[Index])) {
 421       RtEntry = NET_LIST_USER_STRUCT (Entry, IP4_ROUTE_ENTRY, Link);
 422
 423       EFI_IP4 (Table[Count].SubnetAddress)  = HTONL (RtEntry->Dest & RtEntry->Netmask);
 424       EFI_IP4 (Table[Count].SubnetMask)     = HTONL (RtEntry->Netmask);
 425       EFI_IP4 (Table[Count].GatewayAddress) = HTONL (RtEntry->NextHop);
 426
 427       Count++;
 428     }
 429
 430   }
 431
 432   return EFI_SUCCESS;
 433 }
 434
 435 /**
 436   The event process routine when the DHCPv4 service binding protocol is installed
 437   in the system.
 438
 439   @param[in]     Event         Not used.
 440   @param[in]     Context       The pointer to the IP4 config2 instance data.
 441
 442 **/
 443 VOID
 444 EFIAPI
 445 Ip4Config2OnDhcp4SbInstalled (
 446   IN EFI_EVENT  Event,
 447   IN VOID       *Context
 448   )
 449 {
 450   IP4_CONFIG2_INSTANCE  *Instance;
 451
 452   Instance = (IP4_CONFIG2_INSTANCE *) Context;
 453
 454   if ((Instance->Dhcp4Handle != NULL) || (Instance->Policy != Ip4Config2PolicyDhcp)) {
 455     //
 456     // The DHCP4 child is already created or the policy is no longer DHCP.
 457     //
 458     return ;
 459   }
 460
 461   Ip4StartAutoConfig (Instance);
 462 }
 463
 464 /**
 465   Set the station address and subnetmask for the default interface.
 466
 467   @param[in]  IpSb               The pointer to the IP4 service binding instance.
 468   @param[in]  StationAddress     Ip address to be set.
 469   @param[in]  SubnetMask         Subnet to be set.
 470
 471   @retval EFI_SUCCESS   Set default address successful.
 472   @retval Others        Some errors occur in setting.
 473
 474 **/
 475 EFI_STATUS
 476 Ip4Config2SetDefaultAddr (
 477   IN IP4_SERVICE            *IpSb,
 478   IN IP4_ADDR               StationAddress,
 479   IN IP4_ADDR               SubnetMask
 480   )
 481 {
 482   EFI_STATUS                Status;
 483   IP4_INTERFACE             *IpIf;
 484   IP4_PROTOCOL              *Ip4Instance;
 485   EFI_ARP_PROTOCOL          *Arp;
 486   LIST_ENTRY                *Entry;
 487   IP4_ADDR                  Subnet;
 488   IP4_ROUTE_TABLE           *RouteTable;
 489
 490   IpIf = IpSb->DefaultInterface;
 491   ASSERT (IpIf != NULL);
 492
 493   if ((IpIf->Ip == StationAddress) && (IpIf->SubnetMask == SubnetMask)) {
 494     IpSb->State = IP4_SERVICE_CONFIGED;
 495     return EFI_SUCCESS;
 496   }
 497
 498   if (IpSb->Reconfig) {
 499     //
 500     // The default address is changed, free the previous interface first.
 501     //
 502     if (IpSb->DefaultRouteTable != NULL) {
 503       Ip4FreeRouteTable (IpSb->DefaultRouteTable);
 504       IpSb->DefaultRouteTable = NULL;
 505     }
 506
 507     Ip4CancelReceive (IpSb->DefaultInterface);
 508     Ip4FreeInterface (IpSb->DefaultInterface, NULL);
 509     IpSb->DefaultInterface = NULL;
 510     //
 511     // Create new default interface and route table.
 512     //
 513     IpIf = Ip4CreateInterface (IpSb->Mnp, IpSb->Controller, IpSb->Image);
 514     if (IpIf == NULL) {
 515       return EFI_OUT_OF_RESOURCES;
 516     }
 517
 518     RouteTable = Ip4CreateRouteTable ();
 519     if (RouteTable == NULL) {
 520       Ip4FreeInterface (IpIf, NULL);
 521       return EFI_OUT_OF_RESOURCES;
 522     }
 523
 524     IpSb->DefaultInterface  = IpIf;
 525     InsertHeadList (&IpSb->Interfaces, &IpIf->Link);
 526     IpSb->DefaultRouteTable = RouteTable;
 527     Ip4ReceiveFrame (IpIf, NULL, Ip4AccpetFrame, IpSb);
 528   }
 529
 530   if (IpSb->State == IP4_SERVICE_CONFIGED) {
 531     IpSb->State = IP4_SERVICE_UNSTARTED;
 532   }
 533
 534   Status = Ip4SetAddress (IpIf, StationAddress, SubnetMask);
 535   if (EFI_ERROR (Status)) {
 536     return Status;
 537   }
 538
 539   if (IpIf->Arp != NULL) {
 540     //
 541     // A non-NULL IpIf->Arp here means a new ARP child is created when setting default address,
 542     // but some IP children may have referenced the default interface before it is configured,
 543     // these IP instances also consume this ARP protocol so they need to open it BY_CHILD_CONTROLLER.
 544     //
 545     Arp = NULL;
 546     NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {
 547       Ip4Instance = NET_LIST_USER_STRUCT_S (Entry, IP4_PROTOCOL, AddrLink, IP4_PROTOCOL_SIGNATURE);
 548       Status = gBS->OpenProtocol (
 549                       IpIf->ArpHandle,
 550                       &gEfiArpProtocolGuid,
 551                       (VOID **) &Arp,
 552                       gIp4DriverBinding.DriverBindingHandle,
 553                       Ip4Instance->Handle,
 554                       EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
 555                       );
 556       if (EFI_ERROR (Status)) {
 557         return Status;
 558       }
 559     }
 560   }
 561
 562   Ip4AddRoute (
 563     IpSb->DefaultRouteTable,
 564     StationAddress,
 565     SubnetMask,
 566     IP4_ALLZERO_ADDRESS
 567     );
 568
 569   //
 570   // Add a route for the connected network.
 571   //
 572   Subnet = StationAddress & SubnetMask;
 573
 574   Ip4AddRoute (
 575     IpSb->DefaultRouteTable,
 576     Subnet,
 577     SubnetMask,
 578     IP4_ALLZERO_ADDRESS
 579     );
 580
 581   IpSb->State = IP4_SERVICE_CONFIGED;
 582   IpSb->Reconfig = FALSE;
 583
 584   return EFI_SUCCESS;
 585 }
 586
 587 /**
 588   Set the station address, subnetmask and gateway address for the default interface.
 589
 590   @param[in]  Instance         The pointer to the IP4 config2 instance data.
 591   @param[in]  StationAddress   Ip address to be set.
 592   @param[in]  SubnetMask       Subnet to be set.
 593   @param[in]  GatewayAddress   Gateway to be set.
 594
 595   @retval EFI_SUCCESS     Set default If successful.
 596   @retval Others          Errors occur as indicated.
 597
 598 **/
 599 EFI_STATUS
 600 Ip4Config2SetDefaultIf (
 601   IN IP4_CONFIG2_INSTANCE   *Instance,
 602   IN IP4_ADDR               StationAddress,
 603   IN IP4_ADDR               SubnetMask,
 604   IN IP4_ADDR               GatewayAddress
 605   )
 606 {
 607   EFI_STATUS                Status;
 608   IP4_SERVICE               *IpSb;
 609
 610   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
 611
 612   Status = Ip4Config2SetDefaultAddr (IpSb, StationAddress, SubnetMask);
 613   if (EFI_ERROR (Status)) {
 614     return Status;
 615   }
 616
 617   //
 618   // Create a route if there is a default router.
 619   //
 620   if (GatewayAddress != IP4_ALLZERO_ADDRESS) {
 621     Ip4AddRoute (
 622       IpSb->DefaultRouteTable,
 623       IP4_ALLZERO_ADDRESS,
 624       IP4_ALLZERO_ADDRESS,
 625       GatewayAddress
 626       );
 627   }
 628
 629   return EFI_SUCCESS;
 630 }
 631
 632
 633 /**
 634   Release all the DHCP related resources.
 635
 636   @param  Instance              The IP4 config2 instance.
 637
 638   @return None
 639
 640 **/
 641 VOID
 642 Ip4Config2CleanDhcp4 (
 643   IN IP4_CONFIG2_INSTANCE   *Instance
 644   )
 645 {
 646   IP4_SERVICE               *IpSb;
 647
 648   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
 649
 650   if (Instance->Dhcp4 != NULL) {
 651     Instance->Dhcp4->Stop (Instance->Dhcp4);
 652
 653     gBS->CloseProtocol (
 654           Instance->Dhcp4Handle,
 655           &gEfiDhcp4ProtocolGuid,
 656           IpSb->Image,
 657           IpSb->Controller
 658           );
 659
 660     Instance->Dhcp4 = NULL;
 661   }
 662
 663   if (Instance->Dhcp4Handle != NULL) {
 664     NetLibDestroyServiceChild (
 665       IpSb->Controller,
 666       IpSb->Image,
 667       &gEfiDhcp4ServiceBindingProtocolGuid,
 668       Instance->Dhcp4Handle
 669       );
 670
 671     Instance->Dhcp4Handle = NULL;
 672   }
 673
 674   if (Instance->Dhcp4Event != NULL) {
 675     gBS->CloseEvent (Instance->Dhcp4Event);
 676     Instance->Dhcp4Event = NULL;
 677   }
 678 }
 679
 680 /**
 681   This worker function sets the DNS server list for the EFI IPv4 network
 682   stack running on the communication device that this EFI_IP4_CONFIG2_PROTOCOL
 683   manages. The DNS server addresses must be unicast IPv4 addresses.
 684
 685   @param[in]     Instance        The pointer to the IP4 config2 instance data.
 686   @param[in]     DataSize        The size of the buffer pointed to by Data in bytes.
 687   @param[in]     Data            The data buffer to set, points to an array of
 688                                  EFI_IPv4_ADDRESS instances.
 689
 690   @retval EFI_BAD_BUFFER_SIZE    The DataSize does not match the size of the type.
 691   @retval EFI_INVALID_PARAMETER  One or more fields in Data is invalid.
 692   @retval EFI_OUT_OF_RESOURCES   Failed to allocate resources to complete the operation.
 693   @retval EFI_ABORTED            The DNS server addresses to be set equal the current
 694                                  configuration.
 695   @retval EFI_SUCCESS            The specified configuration data for the EFI IPv4
 696                                  network stack was set.
 697
 698 **/
 699 EFI_STATUS
 700 Ip4Config2SetDnsServerWorker (
 701   IN IP4_CONFIG2_INSTANCE    *Instance,
 702   IN UINTN                   DataSize,
 703   IN VOID                    *Data
 704   )
 705 {
 706   UINTN                 OldIndex;
 707   UINTN                 NewIndex;
 708   UINTN                 Index1;
 709   EFI_IPv4_ADDRESS      *OldDns;
 710   EFI_IPv4_ADDRESS      *NewDns;
 711   UINTN                 OldDnsCount;
 712   UINTN                 NewDnsCount;
 713   IP4_CONFIG2_DATA_ITEM *Item;
 714   BOOLEAN               OneAdded;
 715   VOID                  *Tmp;
 716   IP4_ADDR              DnsAddress;
 717
 718   if ((DataSize % sizeof (EFI_IPv4_ADDRESS) != 0) || (DataSize == 0)) {
 719     return EFI_BAD_BUFFER_SIZE;
 720   }
 721
 722   Item        = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
 723   NewDns      = (EFI_IPv4_ADDRESS *) Data;
 724   OldDns      = Item->Data.DnsServers;
 725   NewDnsCount = DataSize / sizeof (EFI_IPv4_ADDRESS);
 726   OldDnsCount = Item->DataSize / sizeof (EFI_IPv4_ADDRESS);
 727   OneAdded    = FALSE;
 728
 729   if (NewDnsCount != OldDnsCount) {
 730     Tmp = AllocatePool (DataSize);
 731     if (Tmp == NULL) {
 732       return EFI_OUT_OF_RESOURCES;
 733     }
 734   } else {
 735     Tmp = NULL;
 736   }
 737
 738   for (NewIndex = 0; NewIndex < NewDnsCount; NewIndex++) {
 739     CopyMem (&DnsAddress, NewDns + NewIndex, sizeof (IP4_ADDR));
 740     if (IP4_IS_UNSPECIFIED (NTOHL (DnsAddress)) || IP4_IS_LOCAL_BROADCAST (NTOHL (DnsAddress))) {
 741       //
 742       // The dns server address must be unicast.
 743       //
 744       if (Tmp != NULL) {
 745         FreePool (Tmp);
 746       }
 747       return EFI_INVALID_PARAMETER;
 748     }
 749
 750     for (Index1 = NewIndex + 1; Index1 < NewDnsCount; Index1++) {
 751       if (EFI_IP4_EQUAL (NewDns + NewIndex, NewDns + Index1)) {
 752         if (Tmp != NULL) {
 753           FreePool (Tmp);
 754         }
 755         return EFI_INVALID_PARAMETER;
 756       }
 757     }
 758
 759     if (OneAdded) {
 760       //
 761       // If any address in the new setting is not in the old settings, skip the
 762       // comparision below.
 763       //
 764       continue;
 765     }
 766
 767     for (OldIndex = 0; OldIndex < OldDnsCount; OldIndex++) {
 768       if (EFI_IP4_EQUAL (NewDns + NewIndex, OldDns + OldIndex)) {
 769         //
 770         // If found break out.
 771         //
 772         break;
 773       }
 774     }
 775
 776     if (OldIndex == OldDnsCount) {
 777       OneAdded = TRUE;
 778     }
 779   }
 780
 781   if (!OneAdded && (DataSize == Item->DataSize)) {
 782     //
 783     // No new item is added and the size is the same.
 784     //
 785     Item->Status = EFI_SUCCESS;
 786     return EFI_ABORTED;
 787   } else {
 788     if (Tmp != NULL) {
 789       if (Item->Data.Ptr != NULL) {
 790         FreePool (Item->Data.Ptr);
 791       }
 792       Item->Data.Ptr = Tmp;
 793     }
 794
 795     CopyMem (Item->Data.Ptr, Data, DataSize);
 796     Item->DataSize = DataSize;
 797     Item->Status   = EFI_SUCCESS;
 798     return EFI_SUCCESS;
 799   }
 800 }
 801
 802
 803
 804 /**
 805   Callback function when DHCP process finished. It will save the
 806   retrieved IP configure parameter from DHCP to the NVRam.
 807
 808   @param  Event                  The callback event
 809   @param  Context                Opaque context to the callback
 810
 811   @return None
 812
 813 **/
 814 VOID
 815 EFIAPI
 816 Ip4Config2OnDhcp4Complete (
 817   IN EFI_EVENT              Event,
 818   IN VOID                   *Context
 819   )
 820 {
 821   IP4_CONFIG2_INSTANCE      *Instance;
 822   EFI_DHCP4_MODE_DATA       Dhcp4Mode;
 823   EFI_STATUS                Status;
 824   IP4_ADDR                  StationAddress;
 825   IP4_ADDR                  SubnetMask;
 826   IP4_ADDR                  GatewayAddress;
 827   UINT32                    Index;
 828   UINT32                    OptionCount;
 829   EFI_DHCP4_PACKET_OPTION   **OptionList;
 830
 831   Instance = (IP4_CONFIG2_INSTANCE *) Context;
 832   ASSERT (Instance->Dhcp4 != NULL);
 833
 834   //
 835   // Get the DHCP retrieved parameters
 836   //
 837   Status = Instance->Dhcp4->GetModeData (Instance->Dhcp4, &Dhcp4Mode);
 838
 839   if (EFI_ERROR (Status)) {
 840     goto Exit;
 841   }
 842
 843   if (Dhcp4Mode.State == Dhcp4Bound) {
 844     StationAddress = EFI_NTOHL (Dhcp4Mode.ClientAddress);
 845     SubnetMask = EFI_NTOHL (Dhcp4Mode.SubnetMask);
 846     GatewayAddress = EFI_NTOHL (Dhcp4Mode.RouterAddress);
 847
 848     Status = Ip4Config2SetDefaultIf (Instance, StationAddress, SubnetMask, GatewayAddress);
 849     if (EFI_ERROR (Status)) {
 850       goto Exit;
 851     }
 852
 853     //
 854     // Parse the ACK to get required DNS server information.
 855     //
 856     OptionCount = 0;
 857     OptionList  = NULL;
 858
 859     Status      = Instance->Dhcp4->Parse (Instance->Dhcp4, Dhcp4Mode.ReplyPacket, &OptionCount, OptionList);
 860     if (Status != EFI_BUFFER_TOO_SMALL) {
 861       goto Exit;
 862     }
 863
 864     OptionList = AllocateZeroPool (OptionCount * sizeof (EFI_DHCP4_PACKET_OPTION *));
 865     if (OptionList == NULL) {
 866       goto Exit;
 867     }
 868
 869     Status = Instance->Dhcp4->Parse (Instance->Dhcp4, Dhcp4Mode.ReplyPacket, &OptionCount, OptionList);
 870     if (EFI_ERROR (Status)) {
 871       FreePool (OptionList);
 872       goto Exit;
 873     }
 874
 875     for (Index = 0; Index < OptionCount; Index++) {
 876       //
 877       // Look for DNS Server opcode (6).
 878       //
 879       if (OptionList[Index]->OpCode == DHCP4_TAG_DNS_SERVER) {
 880         if (((OptionList[Index]->Length & 0x3) != 0) || (OptionList[Index]->Length == 0)) {
 881           break;
 882         }
 883
 884         Ip4Config2SetDnsServerWorker (Instance, OptionList[Index]->Length, &OptionList[Index]->Data[0]);
 885         break;
 886       }
 887     }
 888
 889     FreePool (OptionList);
 890
 891     Instance->DhcpSuccess = TRUE;
 892   }
 893
 894 Exit:
 895   Ip4Config2CleanDhcp4 (Instance);
 896   DispatchDpc ();
 897 }
 898
 899
 900 /**
 901   Start the DHCP configuration for this IP service instance.
 902   It will locates the EFI_IP4_CONFIG2_PROTOCOL, then start the
 903   DHCP configuration.
 904
 905   @param[in]  Instance           The IP4 config2 instance to configure
 906
 907   @retval EFI_SUCCESS            The auto configuration is successfully started
 908   @retval Others                 Failed to start auto configuration.
 909
 910 **/
 911 EFI_STATUS
 912 Ip4StartAutoConfig (
 913   IN IP4_CONFIG2_INSTANCE   *Instance
 914   )
 915 {
 916   IP4_SERVICE                    *IpSb;
 917   EFI_DHCP4_PROTOCOL             *Dhcp4;
 918   EFI_DHCP4_MODE_DATA            Dhcp4Mode;
 919   EFI_DHCP4_PACKET_OPTION        *OptionList[1];
 920   IP4_CONFIG2_DHCP4_OPTION       ParaList;
 921   EFI_STATUS                     Status;
 922
 923
 924   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
 925
 926   if (IpSb->State > IP4_SERVICE_UNSTARTED) {
 927     return EFI_SUCCESS;
 928   }
 929
 930   //
 931   // A host must not invoke DHCP configuration if it is already
 932   // participating in the DHCP configuraiton process.
 933   //
 934   if (Instance->Dhcp4Handle != NULL) {
 935     return EFI_SUCCESS;
 936   }
 937
 938   Status = NetLibCreateServiceChild (
 939              IpSb->Controller,
 940              IpSb->Image,
 941              &gEfiDhcp4ServiceBindingProtocolGuid,
 942              &Instance->Dhcp4Handle
 943              );
 944
 945   if (Status == EFI_UNSUPPORTED) {
 946     //
 947     // No DHCPv4 Service Binding protocol, register a notify.
 948     //
 949     if (Instance->Dhcp4SbNotifyEvent == NULL) {
 950       Instance->Dhcp4SbNotifyEvent = EfiCreateProtocolNotifyEvent (
 951                                        &gEfiDhcp4ServiceBindingProtocolGuid,
 952                                        TPL_CALLBACK,
 953                                        Ip4Config2OnDhcp4SbInstalled,
 954                                        (VOID *) Instance,
 955                                        &Instance->Registration
 956                                        );
 957     }
 958   }
 959
 960   if (EFI_ERROR (Status)) {
 961     return Status;
 962   }
 963
 964   if (Instance->Dhcp4SbNotifyEvent != NULL) {
 965     gBS->CloseEvent (Instance->Dhcp4SbNotifyEvent);
 966   }
 967
 968   Status = gBS->OpenProtocol (
 969                   Instance->Dhcp4Handle,
 970                   &gEfiDhcp4ProtocolGuid,
 971                   (VOID **) &Instance->Dhcp4,
 972                   IpSb->Image,
 973                   IpSb->Controller,
 974                   EFI_OPEN_PROTOCOL_BY_DRIVER
 975                   );
 976   ASSERT_EFI_ERROR (Status);
 977
 978
 979   //
 980   // Check the current DHCP status, if the DHCP process has
 981   // already finished, return now.
 982   //
 983   Dhcp4  = Instance->Dhcp4;
 984   Status = Dhcp4->GetModeData (Dhcp4, &Dhcp4Mode);
 985
 986   if (Dhcp4Mode.State == Dhcp4Bound) {
 987     Ip4Config2OnDhcp4Complete (NULL, Instance);
 988     return EFI_SUCCESS;
 989
 990   }
 991
 992   //
 993   // Try to start the DHCP process. Use most of the current
 994   // DHCP configuration to avoid problems if some DHCP client
 995   // yields the control of this DHCP service to us.
 996   //
 997   ParaList.Head.OpCode             = DHCP4_TAG_PARA_LIST;
 998   ParaList.Head.Length             = 3;
 999   ParaList.Head.Data[0]            = DHCP4_TAG_NETMASK;
1000   ParaList.Route                   = DHCP4_TAG_ROUTER;
1001   ParaList.Dns                     = DHCP4_TAG_DNS_SERVER;
1002   OptionList[0]                    = &ParaList.Head;
1003   Dhcp4Mode.ConfigData.OptionCount = 1;
1004   Dhcp4Mode.ConfigData.OptionList  = OptionList;
1005
1006   Status = Dhcp4->Configure (Dhcp4, &Dhcp4Mode.ConfigData);
1007
1008   if (EFI_ERROR (Status)) {
1009     return Status;
1010   }
1011
1012   //
1013   // Start the DHCP process
1014   //
1015   Status = gBS->CreateEvent (
1016                   EVT_NOTIFY_SIGNAL,
1017                   TPL_CALLBACK,
1018                   Ip4Config2OnDhcp4Complete,
1019                   Instance,
1020                   &Instance->Dhcp4Event
1021                   );
1022
1023   if (EFI_ERROR (Status)) {
1024     return Status;
1025   }
1026
1027   Status = Dhcp4->Start (Dhcp4, Instance->Dhcp4Event);
1028
1029   if (EFI_ERROR (Status)) {
1030     return Status;
1031   }
1032
1033   IpSb->State     = IP4_SERVICE_STARTED;
1034   DispatchDpc ();
1035   return EFI_SUCCESS;
1036
1037 }
1038
1039
1040
1041 /**
1042   The work function is to get the interface information of the communication
1043   device this IP4_CONFIG2_INSTANCE manages.
1044
1045   @param[in]      Instance Pointer to the IP4 config2 instance data.
1046   @param[in, out] DataSize On input, in bytes, the size of Data. On output, in
1047                            bytes, the size of buffer required to store the specified
1048                            configuration data.
1049   @param[in]      Data     The data buffer in which the configuration data is returned.
1050                            Ignored if DataSize is ZERO.
1051
1052   @retval EFI_BUFFER_TOO_SMALL The size of Data is too small for the specified
1053                                configuration data, and the required size is
1054                                returned in DataSize.
1055   @retval EFI_SUCCESS          The specified configuration data was obtained.
1056
1057 **/
1058 EFI_STATUS
1059 Ip4Config2GetIfInfo (
1060   IN IP4_CONFIG2_INSTANCE *Instance,
1061   IN OUT UINTN            *DataSize,
1062   IN VOID                 *Data      OPTIONAL
1063   )
1064 {
1065   IP4_SERVICE                    *IpSb;
1066   UINTN                          Length;
1067   IP4_CONFIG2_DATA_ITEM          *Item;
1068   EFI_IP4_CONFIG2_INTERFACE_INFO *IfInfo;
1069   IP4_ADDR                       Address;
1070
1071   IpSb   = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1072   Length = sizeof (EFI_IP4_CONFIG2_INTERFACE_INFO);
1073
1074   if (IpSb->DefaultRouteTable != NULL) {
1075     Length += IpSb->DefaultRouteTable->TotalNum * sizeof (EFI_IP4_ROUTE_TABLE);
1076   }
1077
1078   if (*DataSize < Length) {
1079     *DataSize = Length;
1080     return EFI_BUFFER_TOO_SMALL;
1081   }
1082
1083   //
1084   // Copy the fixed size part of the interface info.
1085   //
1086   Item = &Instance->DataItem[Ip4Config2DataTypeInterfaceInfo];
1087   IfInfo = (EFI_IP4_CONFIG2_INTERFACE_INFO *) Data;
1088   CopyMem (IfInfo, Item->Data.Ptr, sizeof (EFI_IP4_CONFIG2_INTERFACE_INFO));
1089
1090   //
1091   // Update the address info.
1092   //
1093   if (IpSb->DefaultInterface != NULL) {
1094     Address = HTONL (IpSb->DefaultInterface->Ip);
1095     CopyMem (&IfInfo->StationAddress, &Address, sizeof (EFI_IPv4_ADDRESS));
1096     Address = HTONL (IpSb->DefaultInterface->SubnetMask);
1097     CopyMem (&IfInfo->SubnetMask, &Address, sizeof (EFI_IPv4_ADDRESS));
1098   }
1099
1100   if (IpSb->DefaultRouteTable != NULL) {
1101     IfInfo->RouteTableSize = IpSb->DefaultRouteTable->TotalNum;
1102     IfInfo->RouteTable   = (EFI_IP4_ROUTE_TABLE *) ((UINT8 *) Data + sizeof (EFI_IP4_CONFIG2_INTERFACE_INFO));
1103
1104     Ip4Config2BuildDefaultRouteTable (IpSb, IfInfo->RouteTable);
1105   }
1106
1107   return EFI_SUCCESS;
1108 }
1109
1110 /**
1111   The work function is to set the general configuration policy for the EFI IPv4 network
1112   stack that is running on the communication device managed by this IP4_CONFIG2_INSTANCE.
1113   The policy will affect other configuration settings.
1114
1115   @param[in]     Instance Pointer to the IP4 config2 instance data.
1116   @param[in]     DataSize Size of the buffer pointed to by Data in bytes.
1117   @param[in]     Data     The data buffer to set.
1118
1119   @retval EFI_INVALID_PARAMETER The to be set policy is invalid.
1120   @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the type.
1121   @retval EFI_ABORTED           The new policy equals the current policy.
1122   @retval EFI_SUCCESS           The specified configuration data for the EFI IPv6
1123                                 network stack was set.
1124
1125 **/
1126 EFI_STATUS
1127 Ip4Config2SetPolicy (
1128   IN IP4_CONFIG2_INSTANCE *Instance,
1129   IN UINTN                DataSize,
1130   IN VOID                 *Data
1131   )
1132 {
1133   EFI_IP4_CONFIG2_POLICY NewPolicy;
1134   IP4_CONFIG2_DATA_ITEM  *DataItem;
1135   IP4_SERVICE            *IpSb;
1136
1137   if (DataSize != sizeof (EFI_IP4_CONFIG2_POLICY)) {
1138     return EFI_BAD_BUFFER_SIZE;
1139   }
1140
1141   NewPolicy = *((EFI_IP4_CONFIG2_POLICY *) Data);
1142
1143   if (NewPolicy >= Ip4Config2PolicyMax) {
1144     return EFI_INVALID_PARAMETER;
1145   }
1146
1147   if (NewPolicy == Instance->Policy) {
1148     if (NewPolicy != Ip4Config2PolicyDhcp || Instance->DhcpSuccess) {
1149       return EFI_ABORTED;
1150     }
1151   } else {
1152     //
1153     // The policy is changed. Clean the ManualAddress, Gateway and DnsServers,
1154     // shrink the variable data size, and fire up all the related events.
1155     //
1156     DataItem           = &Instance->DataItem[Ip4Config2DataTypeManualAddress];
1157     if (DataItem->Data.Ptr != NULL) {
1158       FreePool (DataItem->Data.Ptr);
1159     }
1160     DataItem->Data.Ptr = NULL;
1161     DataItem->DataSize = 0;
1162     DataItem->Status   = EFI_NOT_FOUND;
1163     NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
1164
1165     DataItem           = &Instance->DataItem[Ip4Config2DataTypeGateway];
1166     if (DataItem->Data.Ptr != NULL) {
1167       FreePool (DataItem->Data.Ptr);
1168     }
1169     DataItem->Data.Ptr = NULL;
1170     DataItem->DataSize = 0;
1171     DataItem->Status   = EFI_NOT_FOUND;
1172     NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
1173
1174     DataItem           = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
1175     if (DataItem->Data.Ptr != NULL) {
1176       FreePool (DataItem->Data.Ptr);
1177     }
1178     DataItem->Data.Ptr = NULL;
1179     DataItem->DataSize = 0;
1180     DataItem->Status   = EFI_NOT_FOUND;
1181     NetMapIterate (&DataItem->EventMap, Ip4Config2SignalEvent, NULL);
1182
1183     if (NewPolicy == Ip4Config2PolicyDhcp) {
1184       SET_DATA_ATTRIB (DataItem->Attribute, DATA_ATTRIB_VOLATILE);
1185     } else {
1186       //
1187       // The policy is changed from dhcp to static. Stop the DHCPv4 process
1188       // and destroy the DHCPv4 child.
1189       //
1190       if (Instance->Dhcp4Handle != NULL) {
1191         Ip4Config2DestroyDhcp4 (Instance);
1192       }
1193
1194       //
1195       // Close the event.
1196       //
1197       if (Instance->Dhcp4Event != NULL) {
1198         gBS->CloseEvent (Instance->Dhcp4Event);
1199         Instance->Dhcp4Event = NULL;
1200       }
1201     }
1202   }
1203
1204   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1205   Ip4Config2OnPolicyChanged (IpSb, NewPolicy);
1206
1207   Instance->Policy = NewPolicy;
1208
1209   return EFI_SUCCESS;
1210 }
1211
1212 /**
1213   The work function is to set the station addresses manually for the EFI IPv4
1214   network stack. It is only configurable when the policy is Ip4Config2PolicyStatic.
1215
1216   @param[in]     Instance Pointer to the IP4 config2 instance data.
1217   @param[in]     DataSize Size of the buffer pointed to by Data in bytes.
1218   @param[in]     Data     The data buffer to set.
1219
1220   @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the type.
1221   @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
1222                                 under the current policy.
1223   @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
1224   @retval EFI_OUT_OF_RESOURCES  Fail to allocate resource to complete the operation.
1225   @retval EFI_NOT_READY         An asynchrous process is invoked to set the specified
1226                                 configuration data, and the process is not finished.
1227   @retval EFI_ABORTED           The manual addresses to be set equal current
1228                                 configuration.
1229   @retval EFI_SUCCESS           The specified configuration data for the EFI IPv6
1230                                 network stack was set.
1231
1232 **/
1233 EFI_STATUS
1234 Ip4Config2SetMaunualAddress (
1235   IN IP4_CONFIG2_INSTANCE *Instance,
1236   IN UINTN                DataSize,
1237   IN VOID                 *Data
1238   )
1239 {
1240   EFI_IP4_CONFIG2_MANUAL_ADDRESS NewAddress;
1241   IP4_CONFIG2_DATA_ITEM          *DataItem;
1242   EFI_STATUS                     Status;
1243   IP4_ADDR                       StationAddress;
1244   IP4_ADDR                       SubnetMask;
1245   VOID                           *Ptr;
1246   IP4_SERVICE                    *IpSb;
1247
1248   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1249
1250   ASSERT (Instance->DataItem[Ip4Config2DataTypeManualAddress].Status != EFI_NOT_READY);
1251
1252   if (((DataSize % sizeof (EFI_IP4_CONFIG2_MANUAL_ADDRESS)) != 0) || (DataSize == 0)) {
1253     return EFI_BAD_BUFFER_SIZE;
1254   }
1255
1256   if (Instance->Policy != Ip4Config2PolicyStatic) {
1257     return EFI_WRITE_PROTECTED;
1258   }
1259
1260   NewAddress = *((EFI_IP4_CONFIG2_MANUAL_ADDRESS *) Data);
1261
1262   StationAddress = EFI_NTOHL (NewAddress.Address);
1263   SubnetMask = EFI_NTOHL (NewAddress.SubnetMask);
1264
1265   if (NetGetMaskLength (SubnetMask) == IP4_MASK_NUM) {
1266     return EFI_INVALID_PARAMETER;
1267   }
1268
1269   //
1270   // Store the new data, and init the DataItem status to EFI_NOT_READY because
1271   // we may have an asynchronous configuration process.
1272   //
1273   Ptr = AllocateCopyPool (DataSize, Data);
1274   if (Ptr == NULL) {
1275     return EFI_OUT_OF_RESOURCES;
1276   }
1277
1278   DataItem = &Instance->DataItem[Ip4Config2DataTypeManualAddress];
1279   if (DataItem->Data.Ptr != NULL) {
1280     FreePool (DataItem->Data.Ptr);
1281   }
1282
1283   DataItem->Data.Ptr = Ptr;
1284   DataItem->DataSize = DataSize;
1285   DataItem->Status   = EFI_NOT_READY;
1286
1287   IpSb->Reconfig = TRUE;
1288   Status = Ip4Config2SetDefaultAddr (IpSb, StationAddress, SubnetMask);
1289
1290   DataItem->Status = Status;
1291
1292   if (EFI_ERROR (DataItem->Status) && DataItem->Status != EFI_NOT_READY) {
1293     if (Ptr != NULL) {
1294       FreePool (Ptr);
1295     }
1296     DataItem->Data.Ptr = NULL;
1297   }
1298
1299   return Status;
1300 }
1301
1302 /**
1303   The work function is to set the gateway addresses manually for the EFI IPv4
1304   network stack that is running on the communication device that this EFI IPv4
1305   Configuration Protocol manages. It is not configurable when the policy is
1306   Ip4Config2PolicyDhcp. The gateway addresses must be unicast IPv4 addresses.
1307
1308   @param[in]     Instance The pointer to the IP4 config2 instance data.
1309   @param[in]     DataSize The size of the buffer pointed to by Data in bytes.
1310   @param[in]     Data     The data buffer to set. This points to an array of
1311                           EFI_IPv6_ADDRESS instances.
1312
1313   @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the type.
1314   @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
1315                                 under the current policy.
1316   @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
1317   @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource to complete the operation.
1318   @retval EFI_ABORTED           The manual gateway addresses to be set equal the
1319                                 current configuration.
1320   @retval EFI_SUCCESS           The specified configuration data for the EFI IPv6
1321                                 network stack was set.
1322
1323 **/
1324 EFI_STATUS
1325 Ip4Config2SetGateway (
1326   IN IP4_CONFIG2_INSTANCE *Instance,
1327   IN UINTN                DataSize,
1328   IN VOID                 *Data
1329   )
1330 {
1331   IP4_SERVICE                    *IpSb;
1332   IP4_CONFIG2_DATA_ITEM          *DataItem;
1333   IP4_ADDR                       Gateway;
1334
1335   UINTN                 Index1;
1336   UINTN                 Index2;
1337   EFI_IPv4_ADDRESS      *OldGateway;
1338   EFI_IPv4_ADDRESS      *NewGateway;
1339   UINTN                 OldGatewayCount;
1340   UINTN                 NewGatewayCount;
1341   BOOLEAN               OneRemoved;
1342   BOOLEAN               OneAdded;
1343   VOID                  *Tmp;
1344
1345   if ((DataSize % sizeof (EFI_IPv4_ADDRESS) != 0) || (DataSize == 0)) {
1346     return EFI_BAD_BUFFER_SIZE;
1347   }
1348
1349   if (Instance->Policy != Ip4Config2PolicyStatic) {
1350     return EFI_WRITE_PROTECTED;
1351   }
1352
1353   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1354
1355   NewGateway      = (EFI_IPv4_ADDRESS *) Data;
1356   NewGatewayCount = DataSize / sizeof (EFI_IPv4_ADDRESS);
1357   for (Index1 = 0; Index1 < NewGatewayCount; Index1++) {
1358     CopyMem (&Gateway, NewGateway + Index1, sizeof (IP4_ADDR));
1359
1360     if ((IpSb->DefaultInterface->SubnetMask != 0) &&
1361         !NetIp4IsUnicast (NTOHL (Gateway), IpSb->DefaultInterface->SubnetMask)) {
1362       return EFI_INVALID_PARAMETER;
1363     }
1364
1365     for (Index2 = Index1 + 1; Index2 < NewGatewayCount; Index2++) {
1366       if (EFI_IP4_EQUAL (NewGateway + Index1, NewGateway + Index2)) {
1367         return EFI_INVALID_PARAMETER;
1368       }
1369     }
1370   }
1371
1372   DataItem = &Instance->DataItem[Ip4Config2DataTypeGateway];
1373   OldGateway      = DataItem->Data.Gateway;
1374   OldGatewayCount = DataItem->DataSize / sizeof (EFI_IPv4_ADDRESS);
1375   OneRemoved      = FALSE;
1376   OneAdded        = FALSE;
1377
1378   if (NewGatewayCount != OldGatewayCount) {
1379     Tmp = AllocatePool (DataSize);
1380     if (Tmp == NULL) {
1381       return EFI_OUT_OF_RESOURCES;
1382     }
1383   } else {
1384     Tmp = NULL;
1385   }
1386
1387   for (Index1 = 0; Index1 < OldGatewayCount; Index1++) {
1388     //
1389     // Remove this route entry.
1390     //
1391     CopyMem (&Gateway, OldGateway + Index1, sizeof (IP4_ADDR));
1392     Ip4DelRoute (
1393       IpSb->DefaultRouteTable,
1394       IP4_ALLZERO_ADDRESS,
1395       IP4_ALLZERO_ADDRESS,
1396       NTOHL (Gateway)
1397       );
1398     OneRemoved = TRUE;
1399
1400   }
1401
1402   for (Index1 = 0; Index1 < NewGatewayCount; Index1++) {
1403     CopyMem (&Gateway, NewGateway + Index1, sizeof (IP4_ADDR));
1404     Ip4AddRoute (
1405       IpSb->DefaultRouteTable,
1406       IP4_ALLZERO_ADDRESS,
1407       IP4_ALLZERO_ADDRESS,
1408       NTOHL (Gateway)
1409       );
1410
1411     OneAdded = TRUE;
1412   }
1413
1414
1415   if (!OneRemoved && !OneAdded) {
1416     DataItem->Status = EFI_SUCCESS;
1417     return EFI_ABORTED;
1418   } else {
1419
1420     if (Tmp != NULL) {
1421       if (DataItem->Data.Ptr != NULL) {
1422         FreePool (DataItem->Data.Ptr);
1423       }
1424       DataItem->Data.Ptr = Tmp;
1425     }
1426
1427     CopyMem (DataItem->Data.Ptr, Data, DataSize);
1428     DataItem->DataSize = DataSize;
1429     DataItem->Status   = EFI_SUCCESS;
1430     return EFI_SUCCESS;
1431   }
1432
1433 }
1434
1435 /**
1436   The work function is to set the DNS server list for the EFI IPv4 network
1437   stack running on the communication device that this EFI_IP4_CONFIG2_PROTOCOL
1438   manages. It is not configurable when the policy is Ip4Config2PolicyDhcp.
1439   The DNS server addresses must be unicast IPv4 addresses.
1440
1441   @param[in]     Instance The pointer to the IP4 config2 instance data.
1442   @param[in]     DataSize The size of the buffer pointed to by Data in bytes.
1443   @param[in]     Data     The data buffer to set, points to an array of
1444                           EFI_IPv4_ADDRESS instances.
1445
1446   @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the type.
1447   @retval EFI_WRITE_PROTECTED   The specified configuration data cannot be set
1448                                 under the current policy.
1449   @retval EFI_INVALID_PARAMETER One or more fields in Data is invalid.
1450   @retval EFI_OUT_OF_RESOURCES  Failed to allocate resources to complete the operation.
1451   @retval EFI_ABORTED           The DNS server addresses to be set equal the current
1452                                 configuration.
1453   @retval EFI_SUCCESS           The specified configuration data for the EFI IPv4
1454                                 network stack was set.
1455
1456 **/
1457 EFI_STATUS
1458 Ip4Config2SetDnsServer (
1459   IN IP4_CONFIG2_INSTANCE *Instance,
1460   IN UINTN                DataSize,
1461   IN VOID                 *Data
1462   )
1463 {
1464   IP4_CONFIG2_DATA_ITEM *Item;
1465
1466   Item = NULL;
1467
1468   if (Instance->Policy != Ip4Config2PolicyStatic) {
1469     return EFI_WRITE_PROTECTED;
1470   }
1471
1472   Item = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
1473
1474   if (DATA_ATTRIB_SET (Item->Attribute, DATA_ATTRIB_VOLATILE)) {
1475     REMOVE_DATA_ATTRIB (Item->Attribute, DATA_ATTRIB_VOLATILE);
1476   }
1477
1478   return Ip4Config2SetDnsServerWorker (Instance, DataSize, Data);
1479 }
1480
1481 /**
1482   Generate the operational state of the interface this IP4 config2 instance manages
1483   and output in EFI_IP4_CONFIG2_INTERFACE_INFO.
1484
1485   @param[in]      IpSb     The pointer to the IP4 service binding instance.
1486   @param[out]     IfInfo   The pointer to the IP4 config2 interface information structure.
1487
1488 **/
1489 VOID
1490 Ip4Config2InitIfInfo (
1491   IN  IP4_SERVICE                    *IpSb,
1492   OUT EFI_IP4_CONFIG2_INTERFACE_INFO *IfInfo
1493   )
1494 {
1495   UnicodeSPrint (
1496     IfInfo->Name,
1497     EFI_IP4_CONFIG2_INTERFACE_INFO_NAME_SIZE,
1498     L"eth%d",
1499     IpSb->Ip4Config2Instance.IfIndex
1500   );
1501
1502   IfInfo->IfType        = IpSb->SnpMode.IfType;
1503   IfInfo->HwAddressSize = IpSb->SnpMode.HwAddressSize;
1504   CopyMem (&IfInfo->HwAddress, &IpSb->SnpMode.CurrentAddress, IfInfo->HwAddressSize);
1505 }
1506
1507 /**
1508   The event handle routine when DHCPv4 process is finished or is updated.
1509
1510   @param[in]     Event         Not used.
1511   @param[in]     Context       The pointer to the IP4 configuration instance data.
1512
1513 **/
1514 VOID
1515 EFIAPI
1516 Ip4Config2OnDhcp4Event (
1517   IN EFI_EVENT  Event,
1518   IN VOID       *Context
1519   )
1520 {
1521   return ;
1522 }
1523
1524
1525 /**
1526   Set the configuration for the EFI IPv4 network stack running on the communication
1527   device this EFI_IP4_CONFIG2_PROTOCOL instance manages.
1528
1529   This function is used to set the configuration data of type DataType for the EFI
1530   IPv4 network stack that is running on the communication device that this EFI IPv4
1531   Configuration Protocol instance manages.
1532
1533   DataSize is used to calculate the count of structure instances in the Data for
1534   a DataType in which multiple structure instances are allowed.
1535
1536   This function is always non-blocking. When setting some type of configuration data,
1537   an asynchronous process is invoked to check the correctness of the data, such as
1538   performing Duplicate Address Detection on the manually set local IPv4 addresses.
1539   EFI_NOT_READY is returned immediately to indicate that such an asynchronous process
1540   is invoked, and the process is not finished yet. The caller wanting to get the result
1541   of the asynchronous process is required to call RegisterDataNotify() to register an
1542   event on the specified configuration data. Once the event is signaled, the caller
1543   can call GetData() to obtain the configuration data and know the result.
1544   For other types of configuration data that do not require an asynchronous configuration
1545   process, the result of the operation is immediately returned.
1546
1547   @param[in]     This           The pointer to the EFI_IP4_CONFIG2_PROTOCOL instance.
1548   @param[in]     DataType       The type of data to set.
1549   @param[in]     DataSize       Size of the buffer pointed to by Data in bytes.
1550   @param[in]     Data           The data buffer to set. The type of the data buffer is
1551                                 associated with the DataType.
1552
1553   @retval EFI_SUCCESS           The specified configuration data for the EFI IPv6
1554                                 network stack was set successfully.
1555   @retval EFI_INVALID_PARAMETER One or more of the following are TRUE:
1556                                 - This is NULL.
1557                                 - Data is NULL.
1558                                 - One or more fields in Data do not match the requirement of the
1559                                   data type indicated by DataType.
1560   @retval EFI_WRITE_PROTECTED   The specified configuration data is read-only or the specified
1561                                 configuration data cannot be set under the current policy.
1562   @retval EFI_ACCESS_DENIED     Another set operation on the specified configuration
1563                                 data is already in process.
1564   @retval EFI_NOT_READY         An asynchronous process was invoked to set the specified
1565                                 configuration data, and the process is not finished yet.
1566   @retval EFI_BAD_BUFFER_SIZE   The DataSize does not match the size of the type
1567                                 indicated by DataType.
1568   @retval EFI_UNSUPPORTED       This DataType is not supported.
1569   @retval EFI_OUT_OF_RESOURCES  Required system resources could not be allocated.
1570   @retval EFI_DEVICE_ERROR      An unexpected system error or network error occurred.
1571
1572 **/
1573 EFI_STATUS
1574 EFIAPI
1575 EfiIp4Config2SetData (
1576   IN EFI_IP4_CONFIG2_PROTOCOL   *This,
1577   IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
1578   IN UINTN                      DataSize,
1579   IN VOID                       *Data
1580   )
1581 {
1582   EFI_TPL              OldTpl;
1583   EFI_STATUS           Status;
1584   IP4_CONFIG2_INSTANCE *Instance;
1585   IP4_SERVICE          *IpSb;
1586
1587   if ((This == NULL) || (Data == NULL)) {
1588     return EFI_INVALID_PARAMETER;
1589   }
1590
1591   if (DataType >= Ip4Config2DataTypeMaximum) {
1592     return EFI_UNSUPPORTED;
1593   }
1594
1595   Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
1596   IpSb     = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1597   NET_CHECK_SIGNATURE (IpSb, IP4_SERVICE_SIGNATURE);
1598
1599
1600   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
1601
1602   Status = Instance->DataItem[DataType].Status;
1603   if (Status != EFI_NOT_READY) {
1604
1605     if (Instance->DataItem[DataType].SetData == NULL) {
1606       //
1607       // This type of data is readonly.
1608       //
1609       Status = EFI_WRITE_PROTECTED;
1610     } else {
1611
1612       Status = Instance->DataItem[DataType].SetData (Instance, DataSize, Data);
1613       if (!EFI_ERROR (Status)) {
1614         //
1615         // Fire up the events registered with this type of data.
1616         //
1617         NetMapIterate (&Instance->DataItem[DataType].EventMap, Ip4Config2SignalEvent, NULL);
1618         Ip4Config2WriteConfigData (IpSb->MacString, Instance);
1619       } else if (Status == EFI_ABORTED) {
1620         //
1621         // The SetData is aborted because the data to set is the same with
1622         // the one maintained.
1623         //
1624         Status = EFI_SUCCESS;
1625         NetMapIterate (&Instance->DataItem[DataType].EventMap, Ip4Config2SignalEvent, NULL);
1626       }
1627     }
1628   } else {
1629     //
1630     // Another asynchornous process is on the way.
1631     //
1632     Status = EFI_ACCESS_DENIED;
1633   }
1634
1635   gBS->RestoreTPL (OldTpl);
1636
1637   return Status;
1638 }
1639
1640 /**
1641   Get the configuration data for the EFI IPv4 network stack running on the communication
1642   device that this EFI_IP4_CONFIG2_PROTOCOL instance manages.
1643
1644   This function returns the configuration data of type DataType for the EFI IPv4 network
1645   stack running on the communication device that this EFI IPv4 Configuration Protocol instance
1646   manages.
1647
1648   The caller is responsible for allocating the buffer used to return the specified
1649   configuration data. The required size will be returned to the caller if the size of
1650   the buffer is too small.
1651
1652   EFI_NOT_READY is returned if the specified configuration data is not ready due to an
1653   asynchronous configuration process already in progress. The caller can call RegisterDataNotify()
1654   to register an event on the specified configuration data. Once the asynchronous configuration
1655   process is finished, the event will be signaled, and a subsequent GetData() call will return
1656   the specified configuration data.
1657
1658   @param[in]      This           Pointer to the EFI_IP4_CONFIG2_PROTOCOL instance.
1659   @param[in]      DataType       The type of data to get.
1660   @param[in, out] DataSize       On input, in bytes, the size of Data. On output, in bytes, the
1661                                  size of buffer required to store the specified configuration data.
1662   @param[in]     Data            The data buffer in which the configuration data is returned. The
1663                                  type of the data buffer is associated with the DataType.
1664                                  This is an optional parameter that may be NULL.
1665
1666   @retval EFI_SUCCESS           The specified configuration data was obtained successfully.
1667   @retval EFI_INVALID_PARAMETER One or more of the followings are TRUE:
1668                                 - This is NULL.
1669                                 - DataSize is NULL.
1670                                 - Data is NULL if *DataSize is not zero.
1671   @retval EFI_BUFFER_TOO_SMALL  The size of Data is too small for the specified configuration data,
1672                                 and the required size is returned in DataSize.
1673   @retval EFI_NOT_READY         The specified configuration data is not ready due to an
1674                                 asynchronous configuration process already in progress.
1675   @retval EFI_NOT_FOUND         The specified configuration data is not found.
1676
1677 **/
1678 EFI_STATUS
1679 EFIAPI
1680 EfiIp4Config2GetData (
1681   IN EFI_IP4_CONFIG2_PROTOCOL   *This,
1682   IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
1683   IN OUT UINTN                  *DataSize,
1684   IN VOID                       *Data   OPTIONAL
1685   )
1686 {
1687   EFI_TPL               OldTpl;
1688   EFI_STATUS            Status;
1689   IP4_CONFIG2_INSTANCE  *Instance;
1690   IP4_CONFIG2_DATA_ITEM *DataItem;
1691
1692   if ((This == NULL) || (DataSize == NULL) || ((*DataSize != 0) && (Data == NULL))) {
1693     return EFI_INVALID_PARAMETER;
1694   }
1695
1696   if (DataType >= Ip4Config2DataTypeMaximum) {
1697     return EFI_NOT_FOUND;
1698   }
1699
1700   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
1701
1702   Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
1703   DataItem = &Instance->DataItem[DataType];
1704
1705   Status   = Instance->DataItem[DataType].Status;
1706   if (!EFI_ERROR (Status)) {
1707
1708     if (DataItem->GetData != NULL) {
1709
1710       Status = DataItem->GetData (Instance, DataSize, Data);
1711     } else if (*DataSize < Instance->DataItem[DataType].DataSize) {
1712       //
1713       // Update the buffer length.
1714       //
1715       *DataSize = Instance->DataItem[DataType].DataSize;
1716       Status    = EFI_BUFFER_TOO_SMALL;
1717     } else {
1718
1719       *DataSize = Instance->DataItem[DataType].DataSize;
1720       CopyMem (Data, Instance->DataItem[DataType].Data.Ptr, *DataSize);
1721     }
1722   }
1723
1724   gBS->RestoreTPL (OldTpl);
1725
1726   return Status;
1727 }
1728
1729 /**
1730   Register an event that is signaled whenever a configuration process on the specified
1731   configuration data is done.
1732
1733   This function registers an event that is to be signaled whenever a configuration
1734   process on the specified configuration data is performed. An event can be registered
1735   for a different DataType simultaneously. The caller is responsible for determining
1736   which type of configuration data causes the signaling of the event in such an event.
1737
1738   @param[in]     This           Pointer to the EFI_IP4_CONFIG2_PROTOCOL instance.
1739   @param[in]     DataType       The type of data to unregister the event for.
1740   @param[in]     Event          The event to register.
1741
1742   @retval EFI_SUCCESS           The notification event for the specified configuration data is
1743                                 registered.
1744   @retval EFI_INVALID_PARAMETER This is NULL or Event is NULL.
1745   @retval EFI_UNSUPPORTED       The configuration data type specified by DataType is not
1746                                 supported.
1747   @retval EFI_OUT_OF_RESOURCES  Required system resources could not be allocated.
1748   @retval EFI_ACCESS_DENIED     The Event is already registered for the DataType.
1749
1750 **/
1751 EFI_STATUS
1752 EFIAPI
1753 EfiIp4Config2RegisterDataNotify (
1754   IN EFI_IP4_CONFIG2_PROTOCOL   *This,
1755   IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
1756   IN EFI_EVENT                  Event
1757   )
1758 {
1759   EFI_TPL              OldTpl;
1760   EFI_STATUS           Status;
1761   IP4_CONFIG2_INSTANCE *Instance;
1762   NET_MAP              *EventMap;
1763   NET_MAP_ITEM         *Item;
1764
1765   if ((This == NULL) || (Event == NULL)) {
1766     return EFI_INVALID_PARAMETER;
1767   }
1768
1769   if (DataType >= Ip4Config2DataTypeMaximum) {
1770     return EFI_UNSUPPORTED;
1771   }
1772
1773   OldTpl    = gBS->RaiseTPL (TPL_CALLBACK);
1774
1775   Instance  = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
1776   EventMap  = &Instance->DataItem[DataType].EventMap;
1777
1778   //
1779   // Check whether this event is already registered for this DataType.
1780   //
1781   Item = NetMapFindKey (EventMap, Event);
1782   if (Item == NULL) {
1783
1784     Status = NetMapInsertTail (EventMap, Event, NULL);
1785
1786     if (EFI_ERROR (Status)) {
1787
1788       Status = EFI_OUT_OF_RESOURCES;
1789     }
1790
1791   } else {
1792
1793     Status = EFI_ACCESS_DENIED;
1794   }
1795
1796   gBS->RestoreTPL (OldTpl);
1797
1798   return Status;
1799 }
1800
1801 /**
1802   Remove a previously registered event for the specified configuration data.
1803
1804   @param  This                   The pointer to the EFI_IP4_CONFIG2_PROTOCOL instance.
1805   @param  DataType               The type of data to remove from the previously
1806                                  registered event.
1807   @param  Event                  The event to be unregistered.
1808
1809   @retval EFI_SUCCESS            The event registered for the specified
1810                                  configuration data was removed.
1811   @retval EFI_INVALID_PARAMETER  This is NULL or Event is NULL.
1812   @retval EFI_NOT_FOUND          The Event has not been registered for the
1813                                  specified DataType.
1814
1815 **/
1816 EFI_STATUS
1817 EFIAPI
1818 EfiIp4Config2UnregisterDataNotify (
1819   IN EFI_IP4_CONFIG2_PROTOCOL   *This,
1820   IN EFI_IP4_CONFIG2_DATA_TYPE  DataType,
1821   IN EFI_EVENT                  Event
1822   )
1823 {
1824   EFI_TPL              OldTpl;
1825   EFI_STATUS           Status;
1826   IP4_CONFIG2_INSTANCE *Instance;
1827   NET_MAP_ITEM         *Item;
1828
1829   if ((This == NULL) || (Event == NULL)) {
1830     return EFI_INVALID_PARAMETER;
1831   }
1832
1833   if (DataType >= Ip4Config2DataTypeMaximum) {
1834     return EFI_NOT_FOUND;
1835   }
1836
1837   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
1838
1839   Instance = IP4_CONFIG2_INSTANCE_FROM_PROTOCOL (This);
1840
1841   Item = NetMapFindKey (&Instance->DataItem[DataType].EventMap, Event);
1842   if (Item != NULL) {
1843
1844     NetMapRemoveItem (&Instance->DataItem[DataType].EventMap, Item, NULL);
1845     Status = EFI_SUCCESS;
1846   } else {
1847
1848     Status = EFI_NOT_FOUND;
1849   }
1850
1851   gBS->RestoreTPL (OldTpl);
1852
1853   return Status;
1854 }
1855
1856 /**
1857   Initialize an IP4_CONFIG2_INSTANCE.
1858
1859   @param[out]    Instance       The buffer of IP4_CONFIG2_INSTANCE to be initialized.
1860
1861   @retval EFI_OUT_OF_RESOURCES  Failed to allocate resources to complete the operation.
1862   @retval EFI_SUCCESS           The IP4_CONFIG2_INSTANCE initialized successfully.
1863
1864 **/
1865 EFI_STATUS
1866 Ip4Config2InitInstance (
1867   OUT IP4_CONFIG2_INSTANCE  *Instance
1868   )
1869 {
1870   IP4_SERVICE           *IpSb;
1871   IP4_CONFIG2_INSTANCE  *TmpInstance;
1872   LIST_ENTRY            *Entry;
1873   EFI_STATUS            Status;
1874   UINTN                 Index;
1875   UINT16                IfIndex;
1876   IP4_CONFIG2_DATA_ITEM *DataItem;
1877
1878
1879   IpSb = IP4_SERVICE_FROM_IP4_CONFIG2_INSTANCE (Instance);
1880
1881   Instance->Signature = IP4_CONFIG2_INSTANCE_SIGNATURE;
1882
1883
1884   //
1885   // Determine the index of this interface.
1886   //
1887   IfIndex = 0;
1888   NET_LIST_FOR_EACH (Entry, &mIp4Config2InstanceList) {
1889     TmpInstance = NET_LIST_USER_STRUCT_S (Entry, IP4_CONFIG2_INSTANCE, Link, IP4_CONFIG2_INSTANCE_SIGNATURE);
1890
1891     if (TmpInstance->IfIndex > IfIndex) {
1892       //
1893       // There is a sequence hole because some interface is down.
1894       //
1895       break;
1896     }
1897
1898     IfIndex++;
1899   }
1900
1901   Instance->IfIndex = IfIndex;
1902   NetListInsertBefore (Entry, &Instance->Link);
1903
1904   for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
1905     //
1906     // Initialize the event map for each data item.
1907     //
1908     NetMapInit (&Instance->DataItem[Index].EventMap);
1909   }
1910
1911
1912   //
1913   // Initialize each data type: associate storage and set data size for the
1914   // fixed size data types, hook the SetData function, set the data attribute.
1915   //
1916   DataItem           = &Instance->DataItem[Ip4Config2DataTypeInterfaceInfo];
1917   DataItem->GetData  = Ip4Config2GetIfInfo;
1918   DataItem->Data.Ptr = &Instance->InterfaceInfo;
1919   DataItem->DataSize = sizeof (Instance->InterfaceInfo);
1920   SET_DATA_ATTRIB (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED | DATA_ATTRIB_VOLATILE);
1921   Ip4Config2InitIfInfo (IpSb, &Instance->InterfaceInfo);
1922
1923   DataItem           = &Instance->DataItem[Ip4Config2DataTypePolicy];
1924   DataItem->SetData  = Ip4Config2SetPolicy;
1925   DataItem->Data.Ptr = &Instance->Policy;
1926   DataItem->DataSize = sizeof (Instance->Policy);
1927   Instance->Policy   = Ip4Config2PolicyStatic;
1928   SET_DATA_ATTRIB (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED);
1929
1930   DataItem           = &Instance->DataItem[Ip4Config2DataTypeManualAddress];
1931   DataItem->SetData  = Ip4Config2SetMaunualAddress;
1932   DataItem->Status   = EFI_NOT_FOUND;
1933
1934   DataItem           = &Instance->DataItem[Ip4Config2DataTypeGateway];
1935   DataItem->SetData  = Ip4Config2SetGateway;
1936   DataItem->Status   = EFI_NOT_FOUND;
1937
1938   DataItem           = &Instance->DataItem[Ip4Config2DataTypeDnsServer];
1939   DataItem->SetData  = Ip4Config2SetDnsServer;
1940   DataItem->Status   = EFI_NOT_FOUND;
1941
1942   //
1943   // Create the event used for DHCP.
1944   //
1945   Status = gBS->CreateEvent (
1946                   EVT_NOTIFY_SIGNAL,
1947                   TPL_CALLBACK,
1948                   Ip4Config2OnDhcp4Event,
1949                   Instance,
1950                   &Instance->Dhcp4Event
1951                   );
1952   ASSERT_EFI_ERROR (Status);
1953
1954   Instance->Configured  = TRUE;
1955
1956   //
1957   // Try to read the config data from NV variable.
1958   // If not found, write initialized config data into NV variable
1959   // as a default config data.
1960   //
1961   Status = Ip4Config2ReadConfigData (IpSb->MacString, Instance);
1962   if (Status == EFI_NOT_FOUND) {
1963     Status = Ip4Config2WriteConfigData (IpSb->MacString, Instance);
1964   }
1965
1966   if (EFI_ERROR (Status)) {
1967     return Status;
1968   }
1969
1970   Instance->Ip4Config2.SetData              = EfiIp4Config2SetData;
1971   Instance->Ip4Config2.GetData              = EfiIp4Config2GetData;
1972   Instance->Ip4Config2.RegisterDataNotify   = EfiIp4Config2RegisterDataNotify;
1973   Instance->Ip4Config2.UnregisterDataNotify = EfiIp4Config2UnregisterDataNotify;
1974
1975   //
1976   // Publish the IP4 configuration form
1977   //
1978   return Ip4Config2FormInit (Instance);
1979 }
1980
1981
1982 /**
1983   Release an IP4_CONFIG2_INSTANCE.
1984
1985   @param[in, out] Instance    The buffer of IP4_CONFIG2_INSTANCE to be freed.
1986
1987 **/
1988 VOID
1989 Ip4Config2CleanInstance (
1990   IN OUT IP4_CONFIG2_INSTANCE  *Instance
1991   )
1992 {
1993   UINTN                 Index;
1994   IP4_CONFIG2_DATA_ITEM *DataItem;
1995
1996   if (Instance->DeclineAddress != NULL) {
1997     FreePool (Instance->DeclineAddress);
1998   }
1999
2000   if (!Instance->Configured) {
2001     return ;
2002   }
2003
2004   if (Instance->Dhcp4Handle != NULL) {
2005
2006     Ip4Config2DestroyDhcp4 (Instance);
2007   }
2008
2009   //
2010   // Close the event.
2011   //
2012   if (Instance->Dhcp4Event != NULL) {
2013     gBS->CloseEvent (Instance->Dhcp4Event);
2014     Instance->Dhcp4Event = NULL;
2015   }
2016
2017   for (Index = 0; Index < Ip4Config2DataTypeMaximum; Index++) {
2018
2019     DataItem = &Instance->DataItem[Index];
2020
2021     if (!DATA_ATTRIB_SET (DataItem->Attribute, DATA_ATTRIB_SIZE_FIXED)) {
2022       if (DataItem->Data.Ptr != NULL) {
2023         FreePool (DataItem->Data.Ptr);
2024       }
2025       DataItem->Data.Ptr = NULL;
2026       DataItem->DataSize = 0;
2027     }
2028
2029     NetMapClean (&Instance->DataItem[Index].EventMap);
2030   }
2031
2032   Ip4Config2FormUnload (Instance);
2033
2034   RemoveEntryList (&Instance->Link);
2035 }
2036
2037 /**
2038   The event handle for IP4 auto reconfiguration. The original default
2039   interface and route table will be removed as the default.
2040
2041   @param[in]  Context                The IP4 service binding instance.
2042
2043 **/
2044 VOID
2045 EFIAPI
2046 Ip4AutoReconfigCallBackDpc (
2047   IN VOID                   *Context
2048   )
2049 {
2050   IP4_SERVICE               *IpSb;
2051
2052   IpSb      = (IP4_SERVICE *) Context;
2053   NET_CHECK_SIGNATURE (IpSb, IP4_SERVICE_SIGNATURE);
2054
2055   if (IpSb->State > IP4_SERVICE_UNSTARTED) {
2056     IpSb->State = IP4_SERVICE_UNSTARTED;
2057   }
2058
2059   IpSb->Reconfig = TRUE;
2060
2061   Ip4StartAutoConfig (&IpSb->Ip4Config2Instance);
2062
2063   return ;
2064 }
2065
2066
2067 /**
2068   Request Ip4AutoReconfigCallBackDpc as a DPC at TPL_CALLBACK.
2069
2070   @param Event     The event that is signalled.
2071   @param Context   The IP4 service binding instance.
2072
2073 **/
2074 VOID
2075 EFIAPI
2076 Ip4AutoReconfigCallBack (
2077   IN EFI_EVENT              Event,
2078   IN VOID                   *Context
2079   )
2080 {
2081   //
2082   // Request Ip4AutoReconfigCallBackDpc as a DPC at TPL_CALLBACK
2083   //
2084   QueueDpc (TPL_CALLBACK, Ip4AutoReconfigCallBackDpc, Context);
2085 }
2086