NetworkPkg/HttpBootDxe/HttpBootDhcp4.c

   1 /** @file
   2   Functions implementation related with DHCPv4 for HTTP boot driver.
   3
   4 Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials are licensed and made available under
   6 the terms and conditions of the BSD License that accompanies this distribution.
   7 The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php.
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "HttpBootDxe.h"
  16
  17 //
  18 // This is a map from the interested DHCP4 option tags' index to the tag value.
  19 //
  20 UINT8 mInterestedDhcp4Tags[HTTP_BOOT_DHCP4_TAG_INDEX_MAX] = {
  21   DHCP4_TAG_BOOTFILE_LEN,
  22   DHCP4_TAG_OVERLOAD,
  23   DHCP4_TAG_MSG_TYPE,
  24   DHCP4_TAG_SERVER_ID,
  25   DHCP4_TAG_VENDOR_CLASS_ID,
  26   DHCP4_TAG_BOOTFILE,
  27   DHCP4_TAG_DNS_SERVER
  28 };
  29
  30 //
  31 // There are 4 times retries with the value of 4, 8, 16 and 32, refers to UEFI 2.5 spec.
  32 //
  33 UINT32 mHttpDhcpTimeout[4] = {4, 8, 16, 32};
  34
  35 /**
  36   Build the options buffer for the DHCPv4 request packet.
  37
  38   @param[in]  Private             Pointer to HTTP boot driver private data.
  39   @param[out] OptList             Pointer to the option pointer array.
  40   @param[in]  Buffer              Pointer to the buffer to contain the option list.
  41
  42   @return     Index               The count of the built-in options.
  43
  44 **/
  45 UINT32
  46 HttpBootBuildDhcp4Options (
  47   IN  HTTP_BOOT_PRIVATE_DATA        *Private,
  48   OUT EFI_DHCP4_PACKET_OPTION       **OptList,
  49   IN  UINT8                         *Buffer
  50   )
  51 {
  52   HTTP_BOOT_DHCP4_OPTION_ENTRY  OptEnt;
  53   UINT16                        Value;
  54   UINT32                        Index;
  55
  56   Index      = 0;
  57   OptList[0] = (EFI_DHCP4_PACKET_OPTION *) Buffer;
  58
  59   //
  60   // Append parameter request list option.
  61   //
  62   OptList[Index]->OpCode    = DHCP4_TAG_PARA_LIST;
  63   OptList[Index]->Length    = 27;
  64   OptEnt.Para               = (HTTP_BOOT_DHCP4_OPTION_PARA *) OptList[Index]->Data;
  65   OptEnt.Para->ParaList[0]  = DHCP4_TAG_NETMASK;
  66   OptEnt.Para->ParaList[1]  = DHCP4_TAG_TIME_OFFSET;
  67   OptEnt.Para->ParaList[2]  = DHCP4_TAG_ROUTER;
  68   OptEnt.Para->ParaList[3]  = DHCP4_TAG_TIME_SERVER;
  69   OptEnt.Para->ParaList[4]  = DHCP4_TAG_NAME_SERVER;
  70   OptEnt.Para->ParaList[5]  = DHCP4_TAG_DNS_SERVER;
  71   OptEnt.Para->ParaList[6]  = DHCP4_TAG_HOSTNAME;
  72   OptEnt.Para->ParaList[7]  = DHCP4_TAG_BOOTFILE_LEN;
  73   OptEnt.Para->ParaList[8]  = DHCP4_TAG_DOMAINNAME;
  74   OptEnt.Para->ParaList[9]  = DHCP4_TAG_ROOTPATH;
  75   OptEnt.Para->ParaList[10] = DHCP4_TAG_EXTEND_PATH;
  76   OptEnt.Para->ParaList[11] = DHCP4_TAG_EMTU;
  77   OptEnt.Para->ParaList[12] = DHCP4_TAG_TTL;
  78   OptEnt.Para->ParaList[13] = DHCP4_TAG_BROADCAST;
  79   OptEnt.Para->ParaList[14] = DHCP4_TAG_NIS_DOMAIN;
  80   OptEnt.Para->ParaList[15] = DHCP4_TAG_NIS_SERVER;
  81   OptEnt.Para->ParaList[16] = DHCP4_TAG_NTP_SERVER;
  82   OptEnt.Para->ParaList[17] = DHCP4_TAG_VENDOR;
  83   OptEnt.Para->ParaList[18] = DHCP4_TAG_REQUEST_IP;
  84   OptEnt.Para->ParaList[19] = DHCP4_TAG_LEASE;
  85   OptEnt.Para->ParaList[20] = DHCP4_TAG_SERVER_ID;
  86   OptEnt.Para->ParaList[21] = DHCP4_TAG_T1;
  87   OptEnt.Para->ParaList[22] = DHCP4_TAG_T2;
  88   OptEnt.Para->ParaList[23] = DHCP4_TAG_VENDOR_CLASS_ID;
  89   OptEnt.Para->ParaList[25] = DHCP4_TAG_BOOTFILE;
  90   OptEnt.Para->ParaList[26] = DHCP4_TAG_UUID;
  91   Index++;
  92   OptList[Index]            = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
  93
  94   //
  95   // Append UUID/Guid-based client identifier option
  96   //
  97   OptList[Index]->OpCode  = DHCP4_TAG_UUID;
  98   OptList[Index]->Length  = (UINT8) sizeof (HTTP_BOOT_DHCP4_OPTION_UUID);
  99   OptEnt.Uuid             = (HTTP_BOOT_DHCP4_OPTION_UUID *) OptList[Index]->Data;
 100   OptEnt.Uuid->Type       = 0;
 101   if (EFI_ERROR (NetLibGetSystemGuid ((EFI_GUID *) OptEnt.Uuid->Guid))) {
 102     //
 103     // Zero the Guid to indicate NOT programable if failed to get system Guid.
 104     //
 105     ZeroMem (OptEnt.Uuid->Guid, sizeof (EFI_GUID));
 106   }
 107   Index++;
 108   OptList[Index]          = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
 109
 110   //
 111   // Append client network device interface option
 112   //
 113   OptList[Index]->OpCode  = DHCP4_TAG_UNDI;
 114   OptList[Index]->Length  = (UINT8) sizeof (HTTP_BOOT_DHCP4_OPTION_UNDI);
 115   OptEnt.Undi             = (HTTP_BOOT_DHCP4_OPTION_UNDI *) OptList[Index]->Data;
 116
 117   if (Private->Nii != NULL) {
 118     OptEnt.Undi->Type     = Private->Nii->Type;
 119     OptEnt.Undi->MajorVer = Private->Nii->MajorVer;
 120     OptEnt.Undi->MinorVer = Private->Nii->MinorVer;
 121   } else {
 122     OptEnt.Undi->Type     = DEFAULT_UNDI_TYPE;
 123     OptEnt.Undi->MajorVer = DEFAULT_UNDI_MAJOR;
 124     OptEnt.Undi->MinorVer = DEFAULT_UNDI_MINOR;
 125   }
 126
 127   Index++;
 128   OptList[Index] = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
 129
 130   //
 131   // Append client system architecture option
 132   //
 133   OptList[Index]->OpCode  = DHCP4_TAG_ARCH;
 134   OptList[Index]->Length  = (UINT8) sizeof (HTTP_BOOT_DHCP4_OPTION_ARCH);
 135   OptEnt.Arch             = (HTTP_BOOT_DHCP4_OPTION_ARCH *) OptList[Index]->Data;
 136   Value                   = HTONS (EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE);
 137   CopyMem (&OptEnt.Arch->Type, &Value, sizeof (UINT16));
 138   Index++;
 139   OptList[Index]          = GET_NEXT_DHCP_OPTION (OptList[Index - 1]);
 140
 141   //
 142   // Append vendor class identify option
 143   //
 144   OptList[Index]->OpCode  = DHCP4_TAG_VENDOR_CLASS_ID;
 145   OptList[Index]->Length  = (UINT8) sizeof (HTTP_BOOT_DHCP4_OPTION_CLID);
 146   OptEnt.Clid             = (HTTP_BOOT_DHCP4_OPTION_CLID *) OptList[Index]->Data;
 147   CopyMem (
 148     OptEnt.Clid,
 149     DEFAULT_CLASS_ID_DATA,
 150     sizeof (HTTP_BOOT_DHCP4_OPTION_CLID)
 151     );
 152   HttpBootUintnToAscDecWithFormat (
 153     EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE,
 154     OptEnt.Clid->ArchitectureType,
 155     sizeof (OptEnt.Clid->ArchitectureType)
 156     );
 157
 158   if (Private->Nii != NULL) {
 159     CopyMem (OptEnt.Clid->InterfaceName, Private->Nii->StringId, sizeof (OptEnt.Clid->InterfaceName));
 160     HttpBootUintnToAscDecWithFormat (Private->Nii->MajorVer, OptEnt.Clid->UndiMajor, sizeof (OptEnt.Clid->UndiMajor));
 161     HttpBootUintnToAscDecWithFormat (Private->Nii->MinorVer, OptEnt.Clid->UndiMinor, sizeof (OptEnt.Clid->UndiMinor));
 162   }
 163
 164   Index++;
 165
 166   return Index;
 167 }
 168
 169 /**
 170   Parse a certain dhcp4 option by OptTag in Buffer, and return with start pointer.
 171
 172   @param[in]  Buffer              Pointer to the option buffer.
 173   @param[in]  Length              Length of the option buffer.
 174   @param[in]  OptTag              Tag of the required option.
 175
 176   @retval     NULL                Failed to find the required option.
 177   @retval     Others              The position of the required option.
 178
 179 **/
 180 EFI_DHCP4_PACKET_OPTION *
 181 HttpBootParseDhcp4Options (
 182   IN UINT8                      *Buffer,
 183   IN UINT32                     Length,
 184   IN UINT8                      OptTag
 185   )
 186 {
 187   EFI_DHCP4_PACKET_OPTION       *Option;
 188   UINT32                        Offset;
 189
 190   Option  = (EFI_DHCP4_PACKET_OPTION *) Buffer;
 191   Offset  = 0;
 192
 193   while (Offset < Length && Option->OpCode != DHCP4_TAG_EOP) {
 194
 195     if (Option->OpCode == OptTag) {
 196       //
 197       // Found the required option.
 198       //
 199       return Option;
 200     }
 201
 202     //
 203     // Skip the current option to the next.
 204     //
 205     if (Option->OpCode == DHCP4_TAG_PAD) {
 206       Offset++;
 207     } else {
 208       Offset += Option->Length + 2;
 209     }
 210
 211     Option = (EFI_DHCP4_PACKET_OPTION *) (Buffer + Offset);
 212   }
 213
 214   return NULL;
 215 }
 216
 217 /**
 218   Cache the DHCPv4 packet.
 219
 220   @param[in]  Dst          Pointer to the cache buffer for DHCPv4 packet.
 221   @param[in]  Src          Pointer to the DHCPv4 packet to be cached.
 222
 223   @retval     EFI_SUCCESS                Packet is copied.
 224   @retval     EFI_BUFFER_TOO_SMALL       Cache buffer is not big enough to hold the packet.
 225
 226 **/
 227 EFI_STATUS
 228 HttpBootCacheDhcp4Packet (
 229   IN EFI_DHCP4_PACKET     *Dst,
 230   IN EFI_DHCP4_PACKET     *Src
 231   )
 232 {
 233   if (Dst->Size < Src->Length) {
 234     return EFI_BUFFER_TOO_SMALL;
 235   }
 236
 237   CopyMem (&Dst->Dhcp4, &Src->Dhcp4, Src->Length);
 238   Dst->Length = Src->Length;
 239
 240   return EFI_SUCCESS;
 241 }
 242
 243 /**
 244   Parse the cached DHCPv4 packet, including all the options.
 245
 246   @param[in]  Cache4           Pointer to cached DHCPv4 packet.
 247
 248   @retval     EFI_SUCCESS      Parsed the DHCPv4 packet successfully.
 249   @retval     EFI_DEVICE_ERROR Failed to parse an invalid packet.
 250
 251 **/
 252 EFI_STATUS
 253 HttpBootParseDhcp4Packet (
 254   IN HTTP_BOOT_DHCP4_PACKET_CACHE    *Cache4
 255   )
 256 {
 257   EFI_DHCP4_PACKET               *Offer;
 258   EFI_DHCP4_PACKET_OPTION        **Options;
 259   UINTN                          Index;
 260   EFI_DHCP4_PACKET_OPTION        *Option;
 261   BOOLEAN                        IsProxyOffer;
 262   BOOLEAN                        IsHttpOffer;
 263   BOOLEAN                        IsDnsOffer;
 264   BOOLEAN                        IpExpressedUri;
 265   UINT8                          *Ptr8;
 266   EFI_STATUS                     Status;
 267   HTTP_BOOT_OFFER_TYPE           OfferType;
 268   EFI_IPv4_ADDRESS               IpAddr;
 269   BOOLEAN                        FileFieldOverloaded;
 270
 271   IsDnsOffer     = FALSE;
 272   IpExpressedUri = FALSE;
 273   IsProxyOffer   = FALSE;
 274   IsHttpOffer    = FALSE;
 275   FileFieldOverloaded = FALSE;
 276
 277   ZeroMem (Cache4->OptList, sizeof (Cache4->OptList));
 278
 279   Offer   = &Cache4->Packet.Offer;
 280   Options = Cache4->OptList;
 281
 282   //
 283   // Parse DHCPv4 options in this offer, and store the pointers.
 284   // First, try to parse DHCPv4 options from the DHCP optional parameters field.
 285   //
 286   for (Index = 0; Index < HTTP_BOOT_DHCP4_TAG_INDEX_MAX; Index++) {
 287     Options[Index] = HttpBootParseDhcp4Options (
 288                        Offer->Dhcp4.Option,
 289                        GET_OPTION_BUFFER_LEN (Offer),
 290                        mInterestedDhcp4Tags[Index]
 291                        );
 292   }
 293   //
 294   // Second, Check if bootfilename and serverhostname is overloaded to carry DHCP options refers to rfc-2132.
 295   // If yes, try to parse options from the BootFileName field, then ServerName field.
 296   //
 297   Option = Options[HTTP_BOOT_DHCP4_TAG_INDEX_OVERLOAD];
 298   if (Option != NULL) {
 299     if ((Option->Data[0] & HTTP_BOOT_DHCP4_OVERLOAD_FILE) != 0) {
 300       FileFieldOverloaded = TRUE;
 301       for (Index = 0; Index < HTTP_BOOT_DHCP4_TAG_INDEX_MAX; Index++) {
 302         if (Options[Index] == NULL) {
 303           Options[Index] = HttpBootParseDhcp4Options (
 304                              (UINT8 *) Offer->Dhcp4.Header.BootFileName,
 305                              sizeof (Offer->Dhcp4.Header.BootFileName),
 306                              mInterestedDhcp4Tags[Index]
 307                              );
 308         }
 309       }
 310     }
 311     if ((Option->Data[0] & HTTP_BOOT_DHCP4_OVERLOAD_SERVER_NAME) != 0) {
 312       for (Index = 0; Index < HTTP_BOOT_DHCP4_TAG_INDEX_MAX; Index++) {
 313         if (Options[Index] == NULL) {
 314           Options[Index] = HttpBootParseDhcp4Options (
 315                              (UINT8 *) Offer->Dhcp4.Header.ServerName,
 316                              sizeof (Offer->Dhcp4.Header.ServerName),
 317                              mInterestedDhcp4Tags[Index]
 318                              );
 319         }
 320       }
 321     }
 322   }
 323
 324   //
 325   // The offer with "yiaddr" is a proxy offer.
 326   //
 327   if (Offer->Dhcp4.Header.YourAddr.Addr[0] == 0) {
 328     IsProxyOffer = TRUE;
 329   }
 330
 331   //
 332   // The offer with "HTTPClient" is a Http offer.
 333   //
 334   Option = Options[HTTP_BOOT_DHCP4_TAG_INDEX_CLASS_ID];
 335   if ((Option != NULL) && (Option->Length >= 9) &&
 336       (CompareMem (Option->Data, DEFAULT_CLASS_ID_DATA, 9) == 0)) {
 337     IsHttpOffer = TRUE;
 338   }
 339
 340   //
 341   // The offer with Domain Server is a DNS offer.
 342   //
 343   Option = Options[HTTP_BOOT_DHCP4_TAG_INDEX_DNS_SERVER];
 344   if (Option != NULL) {
 345     IsDnsOffer = TRUE;
 346   }
 347
 348   //
 349   // Parse boot file name:
 350   // Boot URI information is provided thru 'file' field in DHCP Header or option 67.
 351   // According to RFC 2132, boot file name should be read from DHCP option 67 (bootfile name) if present.
 352   // Otherwise, read from boot file field in DHCP header.
 353   //
 354   if (Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE] != NULL) {
 355     //
 356     // RFC 2132, Section 9.5 does not strictly state Bootfile name (option 67) is null
 357     // terminated string. So force to append null terminated character at the end of string.
 358     //
 359     Ptr8 =  (UINT8*)&Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Data[0];
 360     Ptr8 += Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Length;
 361     if (*(Ptr8 - 1) != '\0') {
 362       *Ptr8 = '\0';
 363     }
 364   } else if (!FileFieldOverloaded && Offer->Dhcp4.Header.BootFileName[0] != 0) {
 365     //
 366     // If the bootfile is not present and bootfilename is present in DHCPv4 packet, just parse it.
 367     // Do not count dhcp option header here, or else will destroy the serverhostname.
 368     //
 369     Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE] = (EFI_DHCP4_PACKET_OPTION *)
 370                                                     (&Offer->Dhcp4.Header.BootFileName[0] -
 371                                                     OFFSET_OF (EFI_DHCP4_PACKET_OPTION, Data[0]));
 372   }
 373
 374   //
 375   // Http offer must have a boot URI.
 376   //
 377   if (IsHttpOffer && Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE] == NULL) {
 378     return EFI_DEVICE_ERROR;
 379   }
 380
 381   //
 382   // Try to retrieve the IP of HTTP server from URI.
 383   //
 384   if (IsHttpOffer) {
 385     Status = HttpParseUrl (
 386                (CHAR8*) Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Data,
 387                (UINT32) AsciiStrLen ((CHAR8*) Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Data),
 388                FALSE,
 389                &Cache4->UriParser
 390                );
 391     if (EFI_ERROR (Status)) {
 392       return EFI_DEVICE_ERROR;
 393     }
 394
 395     Status = HttpUrlGetIp4 (
 396                (CHAR8*) Options[HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE]->Data,
 397                Cache4->UriParser,
 398                &IpAddr
 399                );
 400     IpExpressedUri = !EFI_ERROR (Status);
 401   }
 402
 403   //
 404   // Determine offer type of the DHCPv4 packet.
 405   //
 406   if (IsHttpOffer) {
 407     if (IpExpressedUri) {
 408       if (IsProxyOffer) {
 409         OfferType = HttpOfferTypeProxyIpUri;
 410       } else {
 411         OfferType = IsDnsOffer ? HttpOfferTypeDhcpIpUriDns : HttpOfferTypeDhcpIpUri;
 412       }
 413     } else {
 414       if (!IsProxyOffer) {
 415         OfferType = IsDnsOffer ? HttpOfferTypeDhcpNameUriDns : HttpOfferTypeDhcpNameUri;
 416       } else {
 417         OfferType = HttpOfferTypeProxyNameUri;
 418       }
 419     }
 420
 421   } else {
 422     if (!IsProxyOffer) {
 423       OfferType = IsDnsOffer ? HttpOfferTypeDhcpDns : HttpOfferTypeDhcpOnly;
 424     } else {
 425       return EFI_DEVICE_ERROR;
 426     }
 427   }
 428
 429   Cache4->OfferType = OfferType;
 430   return EFI_SUCCESS;
 431 }
 432
 433 /**
 434   Cache all the received DHCPv4 offers, and set OfferIndex and OfferCount.
 435
 436   @param[in]  Private               Pointer to HTTP boot driver private data.
 437   @param[in]  RcvdOffer             Pointer to the received offer packet.
 438
 439   @retval     EFI_SUCCESS      Cache and parse the packet successfully.
 440   @retval     Others           Operation failed.
 441 **/
 442 EFI_STATUS
 443 HttpBootCacheDhcp4Offer (
 444   IN HTTP_BOOT_PRIVATE_DATA  *Private,
 445   IN EFI_DHCP4_PACKET        *RcvdOffer
 446   )
 447 {
 448   HTTP_BOOT_DHCP4_PACKET_CACHE  *Cache4;
 449   EFI_DHCP4_PACKET              *Offer;
 450   HTTP_BOOT_OFFER_TYPE          OfferType;
 451   EFI_STATUS                    Status;
 452
 453   ASSERT (Private->OfferNum < HTTP_BOOT_OFFER_MAX_NUM);
 454   Cache4 = &Private->OfferBuffer[Private->OfferNum].Dhcp4;
 455   Offer  = &Cache4->Packet.Offer;
 456
 457   //
 458   // Cache the content of DHCPv4 packet firstly.
 459   //
 460   Status = HttpBootCacheDhcp4Packet (Offer, RcvdOffer);
 461   if (EFI_ERROR (Status)) {
 462     return Status;
 463   }
 464
 465   //
 466   // Validate the DHCPv4 packet, and parse the options and offer type.
 467   //
 468   if (EFI_ERROR (HttpBootParseDhcp4Packet (Cache4))) {
 469     return EFI_ABORTED;
 470   }
 471
 472   //
 473   // Determine whether cache the current offer by type, and record OfferIndex and OfferCount.
 474   //
 475   OfferType = Cache4->OfferType;
 476   ASSERT (OfferType < HttpOfferTypeMax);
 477   ASSERT (Private->OfferCount[OfferType] < HTTP_BOOT_OFFER_MAX_NUM);
 478   Private->OfferIndex[OfferType][Private->OfferCount[OfferType]] = Private->OfferNum;
 479   Private->OfferCount[OfferType]++;
 480   Private->OfferNum++;
 481
 482   return EFI_SUCCESS;
 483 }
 484
 485 /**
 486   Select an DHCPv4 or DHCP6 offer, and record SelectIndex and SelectProxyType.
 487
 488   @param[in]  Private             Pointer to HTTP boot driver private data.
 489
 490 **/
 491 VOID
 492 HttpBootSelectDhcpOffer (
 493   IN HTTP_BOOT_PRIVATE_DATA  *Private
 494   )
 495 {
 496   Private->SelectIndex = 0;
 497   Private->SelectProxyType = HttpOfferTypeMax;
 498
 499   if (Private->FilePathUri != NULL) {
 500     //
 501     // We are in home environment, the URI is already specified.
 502     // Just need to choose a DHCP offer.
 503     // The offer with DNS server address takes priority here.
 504     //
 505     if (Private->OfferCount[HttpOfferTypeDhcpDns] > 0) {
 506
 507       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpDns][0] + 1;
 508
 509     } else if (Private->OfferCount[HttpOfferTypeDhcpIpUriDns] > 0) {
 510
 511       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpIpUriDns][0] + 1;
 512
 513     } else if (Private->OfferCount[HttpOfferTypeDhcpNameUriDns] > 0) {
 514
 515       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpNameUriDns][0] + 1;
 516
 517     }  else if (Private->OfferCount[HttpOfferTypeDhcpOnly] > 0) {
 518
 519       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpOnly][0] + 1;
 520
 521     }  else if (Private->OfferCount[HttpOfferTypeDhcpIpUri] > 0) {
 522
 523       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpIpUri][0] + 1;
 524     }
 525
 526   } else {
 527     //
 528     // We are in corporate environment.
 529     //
 530     // Priority1: HttpOfferTypeDhcpIpUri or HttpOfferTypeDhcpIpUriDns
 531     // Priority2: HttpOfferTypeDhcpNameUriDns
 532     // Priority3: HttpOfferTypeDhcpOnly + HttpOfferTypeProxyIpUri
 533     // Priority4: HttpOfferTypeDhcpDns  + HttpOfferTypeProxyIpUri
 534     // Priority5: HttpOfferTypeDhcpDns  + HttpOfferTypeProxyNameUri
 535     // Priority6: HttpOfferTypeDhcpDns  + HttpOfferTypeDhcpNameUri
 536     //
 537     if (Private->OfferCount[HttpOfferTypeDhcpIpUri] > 0) {
 538
 539       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpIpUri][0] + 1;
 540
 541     } else if (Private->OfferCount[HttpOfferTypeDhcpIpUriDns] > 0) {
 542
 543       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpIpUriDns][0] + 1;
 544
 545     }else if (Private->OfferCount[HttpOfferTypeDhcpNameUriDns] > 0) {
 546
 547       Private->SelectIndex = Private->OfferIndex[HttpOfferTypeDhcpNameUriDns][0] + 1;
 548
 549     } else if (Private->OfferCount[HttpOfferTypeDhcpOnly] > 0 &&
 550                Private->OfferCount[HttpOfferTypeProxyIpUri] > 0) {
 551
 552       Private->SelectIndex     = Private->OfferIndex[HttpOfferTypeDhcpOnly][0] + 1;
 553       Private->SelectProxyType = HttpOfferTypeProxyIpUri;
 554
 555     } else if (Private->OfferCount[HttpOfferTypeDhcpDns] > 0 &&
 556                Private->OfferCount[HttpOfferTypeProxyIpUri] > 0) {
 557
 558       Private->SelectIndex     = Private->OfferIndex[HttpOfferTypeDhcpDns][0] + 1;
 559       Private->SelectProxyType = HttpOfferTypeProxyIpUri;
 560
 561     } else if (Private->OfferCount[HttpOfferTypeDhcpDns] > 0 &&
 562                Private->OfferCount[HttpOfferTypeProxyNameUri] > 0) {
 563
 564       Private->SelectIndex     = Private->OfferIndex[HttpOfferTypeDhcpDns][0] + 1;
 565       Private->SelectProxyType = HttpOfferTypeProxyNameUri;
 566
 567     } else if (Private->OfferCount[HttpOfferTypeDhcpDns] > 0 &&
 568                Private->OfferCount[HttpOfferTypeDhcpNameUri] > 0) {
 569
 570       Private->SelectIndex     = Private->OfferIndex[HttpOfferTypeDhcpDns][0] + 1;
 571       Private->SelectProxyType = HttpOfferTypeDhcpNameUri;
 572     }
 573   }
 574 }
 575
 576
 577 /**
 578   EFI_DHCP4_CALLBACK is provided by the consumer of the EFI DHCPv4 Protocol driver
 579   to intercept events that occurred in the configuration process.
 580
 581   @param[in]  This              Pointer to the EFI DHCPv4 Protocol.
 582   @param[in]  Context           Pointer to the context set by EFI_DHCP4_PROTOCOL.Configure().
 583   @param[in]  CurrentState      The current operational state of the EFI DHCPv4 Protocol driver.
 584   @param[in]  Dhcp4Event        The event that occurs in the current state, which usually means a
 585                                 state transition.
 586   @param[in]  Packet            The DHCPv4 packet that is going to be sent or already received.
 587   @param[out] NewPacket         The packet that is used to replace the above Packet.
 588
 589   @retval EFI_SUCCESS           Tells the EFI DHCPv4 Protocol driver to continue the DHCP process.
 590   @retval EFI_NOT_READY         Only used in the Dhcp4Selecting state. The EFI DHCPv4 Protocol
 591                                 driver will continue to wait for more DHCPOFFER packets until the
 592                                 retry timeout expires.
 593   @retval EFI_ABORTED           Tells the EFI DHCPv4 Protocol driver to abort the current process
 594                                 and return to the Dhcp4Init or Dhcp4InitReboot state.
 595
 596 **/
 597 EFI_STATUS
 598 EFIAPI
 599 HttpBootDhcp4CallBack (
 600   IN  EFI_DHCP4_PROTOCOL               *This,
 601   IN  VOID                             *Context,
 602   IN  EFI_DHCP4_STATE                  CurrentState,
 603   IN  EFI_DHCP4_EVENT                  Dhcp4Event,
 604   IN  EFI_DHCP4_PACKET                 *Packet            OPTIONAL,
 605   OUT EFI_DHCP4_PACKET                 **NewPacket        OPTIONAL
 606   )
 607 {
 608   HTTP_BOOT_PRIVATE_DATA               *Private;
 609   EFI_DHCP4_PACKET_OPTION              *MaxMsgSize;
 610   UINT16                               Value;
 611   EFI_STATUS                           Status;
 612
 613   if ((Dhcp4Event != Dhcp4RcvdOffer) && (Dhcp4Event != Dhcp4SelectOffer)) {
 614     return EFI_SUCCESS;
 615   }
 616
 617   Private = (HTTP_BOOT_PRIVATE_DATA *) Context;
 618
 619   //
 620   // Override the Maximum DHCP Message Size.
 621   //
 622   MaxMsgSize = HttpBootParseDhcp4Options (
 623                  Packet->Dhcp4.Option,
 624                  GET_OPTION_BUFFER_LEN (Packet),
 625                  DHCP4_TAG_MAXMSG
 626                  );
 627   if (MaxMsgSize != NULL) {
 628     Value = HTONS (HTTP_BOOT_DHCP4_PACKET_MAX_SIZE);
 629     CopyMem (MaxMsgSize->Data, &Value, sizeof (Value));
 630   }
 631
 632   Status = EFI_SUCCESS;
 633   switch (Dhcp4Event) {
 634   case Dhcp4RcvdOffer:
 635     Status = EFI_NOT_READY;
 636     if (Packet->Length > HTTP_BOOT_DHCP4_PACKET_MAX_SIZE) {
 637       //
 638       // Ignore the incoming packets which exceed the maximum length.
 639       //
 640       break;
 641     }
 642     if (Private->OfferNum < HTTP_BOOT_OFFER_MAX_NUM) {
 643       //
 644       // Cache the DHCPv4 offers to OfferBuffer[] for select later, and record
 645       // the OfferIndex and OfferCount.
 646       // If error happens, just ignore this packet and continue to wait more offer.
 647       //
 648       HttpBootCacheDhcp4Offer (Private, Packet);
 649     }
 650     break;
 651
 652   case Dhcp4SelectOffer:
 653     //
 654     // Select offer according to the priority in UEFI spec, and record the SelectIndex
 655     // and SelectProxyType.
 656     //
 657     HttpBootSelectDhcpOffer (Private);
 658
 659     if (Private->SelectIndex == 0) {
 660       Status = EFI_ABORTED;
 661     } else {
 662       *NewPacket = &Private->OfferBuffer[Private->SelectIndex - 1].Dhcp4.Packet.Offer;
 663     }
 664     break;
 665
 666   default:
 667     break;
 668   }
 669
 670   return Status;
 671 }
 672
 673 /**
 674   This function will register the IPv4 gateway address to the network device.
 675
 676   @param[in]  Private             The pointer to HTTP_BOOT_PRIVATE_DATA.
 677
 678   @retval     EFI_SUCCESS         The new IP configuration has been configured successfully.
 679   @retval     Others              Failed to configure the address.
 680
 681 **/
 682 EFI_STATUS
 683 HttpBootRegisterIp4Gateway (
 684   IN HTTP_BOOT_PRIVATE_DATA         *Private
 685   )
 686 {
 687   EFI_STATUS                      Status;
 688   EFI_IP4_CONFIG2_PROTOCOL        *Ip4Config2;
 689
 690   ASSERT (!Private->UsingIpv6);
 691
 692   Ip4Config2 = Private->Ip4Config2;
 693
 694   //
 695   // Configure the gateway if valid.
 696   //
 697   if (!EFI_IP4_EQUAL (&Private->GatewayIp, &mZeroIp4Addr)) {
 698     Status = Ip4Config2->SetData (
 699                            Ip4Config2,
 700                            Ip4Config2DataTypeGateway,
 701                            sizeof (EFI_IPv4_ADDRESS),
 702                            &Private->GatewayIp
 703                            );
 704     if (EFI_ERROR (Status)) {
 705       return Status;
 706     }
 707   }
 708
 709   return EFI_SUCCESS;
 710 }
 711
 712 /**
 713   This function will register the default DNS addresses to the network device.
 714
 715   @param[in]  Private             The pointer to HTTP_BOOT_PRIVATE_DATA.
 716   @param[in]  DataLength          Size of the buffer pointed to by DnsServerData in bytes.
 717   @param[in]  DnsServerData       Point a list of DNS server address in an array
 718                                   of EFI_IPv4_ADDRESS instances.
 719
 720   @retval     EFI_SUCCESS         The DNS configuration has been configured successfully.
 721   @retval     Others              Failed to configure the address.
 722
 723 **/
 724 EFI_STATUS
 725 HttpBootRegisterIp4Dns (
 726   IN HTTP_BOOT_PRIVATE_DATA         *Private,
 727   IN UINTN                          DataLength,
 728   IN VOID                           *DnsServerData
 729   )
 730 {
 731   EFI_IP4_CONFIG2_PROTOCOL        *Ip4Config2;
 732
 733   ASSERT (!Private->UsingIpv6);
 734
 735   Ip4Config2 = Private->Ip4Config2;
 736
 737   return Ip4Config2->SetData (
 738                        Ip4Config2,
 739                        Ip4Config2DataTypeDnsServer,
 740                        DataLength,
 741                        DnsServerData
 742                        );
 743 }
 744
 745
 746 /**
 747   This function will switch the IP4 configuration policy to Static.
 748
 749   @param[in]  Private             Pointer to HTTP boot driver private data.
 750
 751   @retval     EFI_SUCCESS         The policy is already configured to static.
 752   @retval     Others              Other error as indicated..
 753
 754 **/
 755 EFI_STATUS
 756 HttpBootSetIp4Policy (
 757   IN HTTP_BOOT_PRIVATE_DATA         *Private
 758   )
 759 {
 760   EFI_IP4_CONFIG2_POLICY          Policy;
 761   EFI_STATUS                      Status;
 762   EFI_IP4_CONFIG2_PROTOCOL        *Ip4Config2;
 763   UINTN                           DataSize;
 764
 765   Ip4Config2 = Private->Ip4Config2;
 766
 767   DataSize = sizeof (EFI_IP4_CONFIG2_POLICY);
 768   Status = Ip4Config2->GetData (
 769                          Ip4Config2,
 770                          Ip4Config2DataTypePolicy,
 771                          &DataSize,
 772                          &Policy
 773                          );
 774   if (EFI_ERROR (Status)) {
 775     return Status;
 776   }
 777
 778   if (Policy != Ip4Config2PolicyStatic) {
 779     Policy = Ip4Config2PolicyStatic;
 780     Status= Ip4Config2->SetData (
 781                           Ip4Config2,
 782                           Ip4Config2DataTypePolicy,
 783                           sizeof (EFI_IP4_CONFIG2_POLICY),
 784                           &Policy
 785                           );
 786     if (EFI_ERROR (Status)) {
 787       return Status;
 788     }
 789   }
 790
 791   return EFI_SUCCESS;
 792 }
 793
 794 /**
 795   Start the D.O.R.A DHCPv4 process to acquire the IPv4 address and other Http boot information.
 796
 797   @param[in]  Private           Pointer to HTTP boot driver private data.
 798
 799   @retval EFI_SUCCESS           The D.O.R.A process successfully finished.
 800   @retval Others                Failed to finish the D.O.R.A process.
 801
 802 **/
 803 EFI_STATUS
 804 HttpBootDhcp4Dora (
 805   IN HTTP_BOOT_PRIVATE_DATA         *Private
 806   )
 807 {
 808   EFI_DHCP4_PROTOCOL           *Dhcp4;
 809   UINT32                       OptCount;
 810   EFI_DHCP4_PACKET_OPTION      *OptList[HTTP_BOOT_DHCP4_OPTION_MAX_NUM];
 811   UINT8                        Buffer[HTTP_BOOT_DHCP4_OPTION_MAX_SIZE];
 812   EFI_DHCP4_CONFIG_DATA        Config;
 813   EFI_STATUS                   Status;
 814   EFI_DHCP4_MODE_DATA          Mode;
 815
 816   Dhcp4 = Private->Dhcp4;
 817   ASSERT (Dhcp4 != NULL);
 818
 819   Status = HttpBootSetIp4Policy (Private);
 820   if (EFI_ERROR (Status)) {
 821     return Status;
 822   }
 823
 824   //
 825   // Build option list for the request packet.
 826   //
 827   OptCount = HttpBootBuildDhcp4Options (Private, OptList, Buffer);
 828   ASSERT (OptCount > 0);
 829
 830   ZeroMem (&Config, sizeof(Config));
 831   Config.OptionCount      = OptCount;
 832   Config.OptionList       = OptList;
 833   Config.Dhcp4Callback    = HttpBootDhcp4CallBack;
 834   Config.CallbackContext  = Private;
 835   Config.DiscoverTryCount = HTTP_BOOT_DHCP_RETRIES;
 836   Config.DiscoverTimeout  = mHttpDhcpTimeout;
 837
 838   //
 839   // Configure the DHCPv4 instance for HTTP boot.
 840   //
 841   Status = Dhcp4->Configure (Dhcp4, &Config);
 842   if (EFI_ERROR (Status)) {
 843     goto ON_EXIT;
 844   }
 845
 846   //
 847   // Initialize the record fields for DHCPv4 offer in private data.
 848   //
 849   Private->OfferNum = 0;
 850   ZeroMem (Private->OfferCount, sizeof (Private->OfferCount));
 851   ZeroMem (Private->OfferIndex, sizeof (Private->OfferIndex));
 852
 853   //
 854   // Start DHCPv4 D.O.R.A. process to acquire IPv4 address.
 855   //
 856   Status = Dhcp4->Start (Dhcp4, NULL);
 857   if (EFI_ERROR (Status)) {
 858     goto ON_EXIT;
 859   }
 860
 861   //
 862   // Get the acquired IPv4 address and store them.
 863   //
 864   Status = Dhcp4->GetModeData (Dhcp4, &Mode);
 865   if (EFI_ERROR (Status)) {
 866     goto ON_EXIT;
 867   }
 868
 869   ASSERT (Mode.State == Dhcp4Bound);
 870   CopyMem (&Private->StationIp, &Mode.ClientAddress, sizeof (EFI_IPv4_ADDRESS));
 871   CopyMem (&Private->SubnetMask, &Mode.SubnetMask, sizeof (EFI_IPv4_ADDRESS));
 872   CopyMem (&Private->GatewayIp, &Mode.RouterAddress, sizeof (EFI_IPv4_ADDRESS));
 873
 874   Status = HttpBootRegisterIp4Gateway (Private);
 875   if (EFI_ERROR (Status)) {
 876     goto ON_EXIT;
 877   }
 878
 879   AsciiPrint ("\n  Station IP address is ");
 880   HttpBootShowIp4Addr (&Private->StationIp.v4);
 881   AsciiPrint ("\n");
 882
 883 ON_EXIT:
 884   if (EFI_ERROR (Status)) {
 885     Dhcp4->Stop (Dhcp4);
 886     Dhcp4->Configure (Dhcp4, NULL);
 887   } else {
 888     ZeroMem (&Config, sizeof (EFI_DHCP4_CONFIG_DATA));
 889     Dhcp4->Configure (Dhcp4, &Config);
 890   }
 891
 892   return Status;
 893 }