MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDhcp.h

   1 /** @file
   2   Dhcp and Discover routines for PxeBc.
   3
   4 Copyright (c) 2007 - 2009, Intel Corporation.<BR>
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  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 #ifndef __EFI_PXEBC_DHCP_H__
  16 #define __EFI_PXEBC_DHCP_H__
  17
  18 typedef enum {
  19   PXEBC_DHCP4_MAX_OPTION_NUM        = 16,
  20   PXEBC_DHCP4_MAX_OPTION_SIZE       = 312,
  21   PXEBC_DHCP4_MAX_PACKET_SIZE       = 1472,
  22
  23   PXEBC_DHCP4_S_PORT                = 67,
  24   PXEBC_DHCP4_C_PORT                = 68,
  25   PXEBC_BS_DOWNLOAD_PORT            = 69,
  26   PXEBC_BS_DISCOVER_PORT            = 4011,
  27
  28   PXEBC_DHCP4_OPCODE_REQUEST        = 1,
  29   PXEBC_DHCP4_OPCODE_REPLY          = 2,
  30   PXEBC_DHCP4_MSG_TYPE_REQUEST      = 3,
  31   PXEBC_DHCP4_MAGIC                 = 0x63538263, // network byte order
  32   //
  33   // Dhcp Options
  34   //
  35   PXEBC_DHCP4_TAG_PAD               = 0,    // Pad Option
  36   PXEBC_DHCP4_TAG_EOP               = 255,  // End Option
  37   PXEBC_DHCP4_TAG_NETMASK           = 1,    // Subnet Mask
  38   PXEBC_DHCP4_TAG_TIME_OFFSET       = 2,    // Time Offset from UTC
  39   PXEBC_DHCP4_TAG_ROUTER            = 3,    // Router option,
  40   PXEBC_DHCP4_TAG_TIME_SERVER       = 4,    // Time Server
  41   PXEBC_DHCP4_TAG_NAME_SERVER       = 5,    // Name Server
  42   PXEBC_DHCP4_TAG_DNS_SERVER        = 6,    // Domain Name Server
  43   PXEBC_DHCP4_TAG_HOSTNAME          = 12,   // Host Name
  44   PXEBC_DHCP4_TAG_BOOTFILE_LEN      = 13,   // Boot File Size
  45   PXEBC_DHCP4_TAG_DUMP              = 14,   // Merit Dump File
  46   PXEBC_DHCP4_TAG_DOMAINNAME        = 15,   // Domain Name
  47   PXEBC_DHCP4_TAG_ROOTPATH          = 17,   // Root path
  48   PXEBC_DHCP4_TAG_EXTEND_PATH       = 18,   // Extensions Path
  49   PXEBC_DHCP4_TAG_EMTU              = 22,   // Maximum Datagram Reassembly Size
  50   PXEBC_DHCP4_TAG_TTL               = 23,   // Default IP Time-to-live
  51   PXEBC_DHCP4_TAG_BROADCAST         = 28,   // Broadcast Address
  52   PXEBC_DHCP4_TAG_NIS_DOMAIN        = 40,   // Network Information Service Domain
  53   PXEBC_DHCP4_TAG_NIS_SERVER        = 41,   // Network Information Servers
  54   PXEBC_DHCP4_TAG_NTP_SERVER        = 42,   // Network Time Protocol Servers
  55   PXEBC_DHCP4_TAG_VENDOR            = 43,   // Vendor Specific Information
  56   PXEBC_DHCP4_TAG_REQUEST_IP        = 50,   // Requested IP Address
  57   PXEBC_DHCP4_TAG_LEASE             = 51,   // IP Address Lease Time
  58   PXEBC_DHCP4_TAG_OVERLOAD          = 52,   // Option Overload
  59   PXEBC_DHCP4_TAG_MSG_TYPE          = 53,   // DHCP Message Type
  60   PXEBC_DHCP4_TAG_SERVER_ID         = 54,   // Server Identifier
  61   PXEBC_DHCP4_TAG_PARA_LIST         = 55,   // Parameter Request List
  62   PXEBC_DHCP4_TAG_MAXMSG            = 57,   // Maximum DHCP Message Size
  63   PXEBC_DHCP4_TAG_T1                = 58,   // Renewal (T1) Time Value
  64   PXEBC_DHCP4_TAG_T2                = 59,   // Rebinding (T2) Time Value
  65   PXEBC_DHCP4_TAG_CLASS_ID          = 60,   // Vendor class identifier
  66   PXEBC_DHCP4_TAG_CLIENT_ID         = 61,   // Client-identifier
  67   PXEBC_DHCP4_TAG_TFTP              = 66,   // TFTP server name
  68   PXEBC_DHCP4_TAG_BOOTFILE          = 67,   // Bootfile name
  69   PXEBC_PXE_DHCP4_TAG_ARCH          = 93,
  70   PXEBC_PXE_DHCP4_TAG_UNDI          = 94,
  71   PXEBC_PXE_DHCP4_TAG_UUID          = 97,
  72   //
  73   // Sub-Options in Dhcp Vendor Option
  74   //
  75   PXEBC_VENDOR_TAG_MTFTP_IP         = 1,
  76   PXEBC_VENDOR_TAG_MTFTP_CPORT      = 2,
  77   PXEBC_VENDOR_TAG_MTFTP_SPORT      = 3,
  78   PXEBC_VENDOR_TAG_MTFTP_TIMEOUT    = 4,
  79   PXEBC_VENDOR_TAG_MTFTP_DELAY      = 5,
  80   PXEBC_VENDOR_TAG_DISCOVER_CTRL    = 6,
  81   PXEBC_VENDOR_TAG_DISCOVER_MCAST   = 7,
  82   PXEBC_VENDOR_TAG_BOOT_SERVERS     = 8,
  83   PXEBC_VENDOR_TAG_BOOT_MENU        = 9,
  84   PXEBC_VENDOR_TAG_MENU_PROMPT      = 10,
  85   PXEBC_VENDOR_TAG_MCAST_ALLOC      = 11,
  86   PXEBC_VENDOR_TAG_CREDENTIAL_TYPES = 12,
  87   PXEBC_VENDOR_TAG_BOOT_ITEM        = 71,
  88
  89   PXEBC_DHCP4_DISCOVER_INIT_TIMEOUT = 4,
  90   PXEBC_DHCP4_DISCOVER_RETRIES      = 4,
  91
  92   PXEBC_MAX_MENU_NUM                = 24,
  93   PXEBC_MAX_OFFER_NUM               = 16,
  94
  95   PXEBC_BOOT_REQUEST_TIMEOUT        = 1,
  96   PXEBC_BOOT_REQUEST_RETRIES        = 4,
  97
  98   PXEBC_DHCP4_OVERLOAD_FILE         = 1,
  99   PXEBC_DHCP4_OVERLOAD_SERVER_NAME  = 2
 100 } PXEBC_ENUM_TYPES;
 101
 102 //
 103 // The array index of the DHCP4 option tag interested
 104 //
 105 typedef enum {
 106   PXEBC_DHCP4_TAG_INDEX_BOOTFILE_LEN,
 107   PXEBC_DHCP4_TAG_INDEX_VENDOR,
 108   PXEBC_DHCP4_TAG_INDEX_OVERLOAD,
 109   PXEBC_DHCP4_TAG_INDEX_MSG_TYPE,
 110   PXEBC_DHCP4_TAG_INDEX_SERVER_ID,
 111   PXEBC_DHCP4_TAG_INDEX_CLASS_ID,
 112   PXEBC_DHCP4_TAG_INDEX_BOOTFILE,
 113   PXEBC_DHCP4_TAG_INDEX_MAX
 114 } PXEBC_DHCP4_TAG_INDEX_ENUM_TYPES;
 115
 116 //
 117 // The type of DHCP OFFER, arranged by priority, PXE10 has the highest priority.
 118 //
 119 typedef enum {
 120   DHCP4_PACKET_TYPE_PXE10,
 121   DHCP4_PACKET_TYPE_WFM11A,
 122   DHCP4_PACKET_TYPE_BINL,
 123   DHCP4_PACKET_TYPE_DHCP_ONLY,
 124   DHCP4_PACKET_TYPE_MAX,
 125   DHCP4_PACKET_TYPE_BOOTP           = DHCP4_PACKET_TYPE_MAX
 126 } DHCP4_PACKET_TYPE_ENUM_TYPES;
 127
 128 #define BIT(x)  (1 << x)
 129 #define CTRL(x) (0x1F & (x))
 130
 131 //
 132 // WfM11a options
 133 //
 134 #define MTFTP_VENDOR_OPTION_BIT_MAP (BIT (PXEBC_VENDOR_TAG_MTFTP_IP) | \
 135                                      BIT (PXEBC_VENDOR_TAG_MTFTP_CPORT) | \
 136                                      BIT (PXEBC_VENDOR_TAG_MTFTP_SPORT) | \
 137                                      BIT (PXEBC_VENDOR_TAG_MTFTP_TIMEOUT) | \
 138                                      BIT (PXEBC_VENDOR_TAG_MTFTP_DELAY))
 139 //
 140 // Discoverty options
 141 //
 142 #define DISCOVER_VENDOR_OPTION_BIT_MAP  (BIT (PXEBC_VENDOR_TAG_DISCOVER_CTRL) | \
 143                                          BIT (PXEBC_VENDOR_TAG_DISCOVER_MCAST) | \
 144                                          BIT (PXEBC_VENDOR_TAG_BOOT_SERVERS) | \
 145                                          BIT (PXEBC_VENDOR_TAG_BOOT_MENU) | \
 146                                          BIT (PXEBC_VENDOR_TAG_MENU_PROMPT))
 147
 148 #define IS_VALID_BOOT_PROMPT(x) \
 149   ((((x)[0]) & BIT (PXEBC_VENDOR_TAG_MENU_PROMPT)) == BIT (PXEBC_VENDOR_TAG_MENU_PROMPT))
 150
 151 #define IS_VALID_BOOT_MENU(x) \
 152   ((((x)[0]) & BIT (PXEBC_VENDOR_TAG_BOOT_MENU)) == BIT (PXEBC_VENDOR_TAG_BOOT_MENU))
 153
 154 #define IS_VALID_MTFTP_VENDOR_OPTION(x) \
 155     (((UINT32) ((x)[0]) & MTFTP_VENDOR_OPTION_BIT_MAP) == MTFTP_VENDOR_OPTION_BIT_MAP)
 156
 157 #define IS_VALID_DISCOVER_VENDOR_OPTION(x)  (((UINT32) ((x)[0]) & DISCOVER_VENDOR_OPTION_BIT_MAP) != 0)
 158
 159 #define IS_VALID_CREDENTIAL_VENDOR_OPTION(x) \
 160     (((UINT32) ((x)[0]) & BIT (PXEBC_VENDOR_TAG_CREDENTIAL_TYPES)) == BIT (PXEBC_VENDOR_TAG_CREDENTIAL_TYPES))
 161
 162 #define IS_VALID_BOOTITEM_VENDOR_OPTION(x) \
 163     (((UINT32) ((x)[PXEBC_VENDOR_TAG_BOOT_ITEM / 32]) & BIT (PXEBC_VENDOR_TAG_BOOT_ITEM % 32)) \
 164       == BIT (PXEBC_VENDOR_TAG_BOOT_ITEM % 32))
 165
 166 #define IS_DISABLE_BCAST_DISCOVER(x)    (((x) & BIT (0)) == BIT (0))
 167 #define IS_DISABLE_MCAST_DISCOVER(x)    (((x) & BIT (1)) == BIT (1))
 168 #define IS_ENABLE_USE_SERVER_LIST(x)    (((x) & BIT (2)) == BIT (2))
 169 #define IS_ENABLE_BOOT_FILE_NAME(x)     (((x) & BIT (3)) == BIT (3))
 170
 171 #define SET_VENDOR_OPTION_BIT_MAP(x, y) (((x)[(y) / 32]) = (UINT32) ((x)[(y) / 32]) | BIT ((y) % 32))
 172
 173 #pragma pack(1)
 174 typedef struct {
 175   UINT8 ParaList[135];
 176 } PXEBC_DHCP4_OPTION_PARA;
 177
 178 typedef struct {
 179   UINT16  Size;
 180 } PXEBC_DHCP4_OPTION_MAX_MESG_SIZE;
 181
 182 typedef struct {
 183   UINT8 Type;
 184   UINT8 MajorVer;
 185   UINT8 MinorVer;
 186 } PXEBC_DHCP4_OPTION_UNDI;
 187
 188 typedef struct {
 189   UINT8 Type;
 190 } PXEBC_DHCP4_OPTION_MESG;
 191
 192 typedef struct {
 193   UINT16  Type;
 194 } PXEBC_DHCP4_OPTION_ARCH;
 195
 196 #define DEFAULT_CLASS_ID_DATA "PXEClient:Arch:xxxxx:UNDI:003000"
 197 #define DEFAULT_UNDI_TYPE     1
 198 #define DEFAULT_UNDI_MAJOR    3
 199 #define DEFAULT_UNDI_MINOR    0
 200
 201 typedef struct {
 202   UINT8 ClassIdentifier[10];
 203   UINT8 ArchitecturePrefix[5];
 204   UINT8 ArchitectureType[5];
 205   UINT8 Lit3[1];
 206   UINT8 InterfaceName[4];
 207   UINT8 Lit4[1];
 208   UINT8 UndiMajor[3];
 209   UINT8 UndiMinor[3];
 210 } PXEBC_DHCP4_OPTION_CLID;
 211
 212 typedef struct {
 213   UINT8 Type;
 214   UINT8 Guid[16];
 215 } PXEBC_DHCP4_OPTION_UUID;
 216
 217 typedef struct {
 218   UINT16  Type;
 219   UINT16  Layer;
 220 } PXEBC_OPTION_BOOT_ITEM;
 221
 222 #pragma pack()
 223
 224 typedef union {
 225   PXEBC_DHCP4_OPTION_PARA           *Para;
 226   PXEBC_DHCP4_OPTION_UNDI           *Undi;
 227   PXEBC_DHCP4_OPTION_ARCH           *Arch;
 228   PXEBC_DHCP4_OPTION_CLID           *Clid;
 229   PXEBC_DHCP4_OPTION_UUID           *Uuid;
 230   PXEBC_DHCP4_OPTION_MESG           *Mesg;
 231   PXEBC_DHCP4_OPTION_MAX_MESG_SIZE  *MaxMesgSize;
 232 } PXEBC_DHCP4_OPTION_ENTRY;
 233
 234 typedef struct {
 235   UINT16            Type;
 236   UINT8             IpCnt;
 237   EFI_IPv4_ADDRESS  IpAddr[1];
 238 } PXEBC_BOOT_SVR_ENTRY;
 239
 240 typedef struct {
 241   UINT16  Type;
 242   UINT8   DescLen;
 243   UINT8   DescStr[1];
 244 } PXEBC_BOOT_MENU_ENTRY;
 245
 246 typedef struct {
 247   UINT8 Timeout;
 248   UINT8 Prompt[1];
 249 } PXEBC_MENU_PROMPT;
 250
 251 typedef struct {
 252   UINT32                BitMap[8];
 253   EFI_IPv4_ADDRESS      MtftpIp;
 254   UINT16                MtftpCPort;
 255   UINT16                MtftpSPort;
 256   UINT8                 MtftpTimeout;
 257   UINT8                 MtftpDelay;
 258   UINT8                 DiscoverCtrl;
 259   EFI_IPv4_ADDRESS      DiscoverMcastIp;
 260   EFI_IPv4_ADDRESS      McastIpBase;
 261   UINT16                McastIpBlock;
 262   UINT16                McastIpRange;
 263   UINT16                BootSrvType;
 264   UINT16                BootSrvLayer;
 265   PXEBC_BOOT_SVR_ENTRY  *BootSvr;
 266   UINT8                 BootSvrLen;
 267   PXEBC_BOOT_MENU_ENTRY *BootMenu;
 268   UINT8                 BootMenuLen;
 269   PXEBC_MENU_PROMPT     *MenuPrompt;
 270   UINT8                 MenuPromptLen;
 271   UINT32                *CredType;
 272   UINT8                 CredTypeLen;
 273 } PXEBC_VENDOR_OPTION;
 274
 275 #define PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE  (OFFSET_OF (EFI_DHCP4_PACKET, Dhcp4) + PXEBC_DHCP4_MAX_PACKET_SIZE)
 276
 277 typedef struct {
 278   union {
 279     EFI_DHCP4_PACKET  Offer;
 280     EFI_DHCP4_PACKET  Ack;
 281     UINT8             Buffer[PXEBC_CACHED_DHCP4_PACKET_MAX_SIZE];
 282   } Packet;
 283
 284   BOOLEAN                 IsPxeOffer;
 285   UINT8                   OfferType;
 286   EFI_DHCP4_PACKET_OPTION *Dhcp4Option[PXEBC_DHCP4_TAG_INDEX_MAX];
 287   PXEBC_VENDOR_OPTION    PxeVendorOption;
 288 } PXEBC_CACHED_DHCP4_PACKET;
 289
 290 #define GET_NEXT_DHCP_OPTION(Opt) \
 291   (EFI_DHCP4_PACKET_OPTION *) ((UINT8 *) (Opt) + sizeof (EFI_DHCP4_PACKET_OPTION) + (Opt)->Length - 1)
 292
 293 #define GET_OPTION_BUFFER_LEN(Pkt)  ((Pkt)->Length - sizeof (EFI_DHCP4_HEADER) - 4)
 294 #define IS_PROXY_DHCP_OFFER(Offer)  EFI_IP4_EQUAL (&((Offer)->Dhcp4.Header.YourAddr), &mZeroIp4Addr)
 295
 296 #define GET_NEXT_BOOT_SVR_ENTRY(Ent) \
 297   (PXEBC_BOOT_SVR_ENTRY *) ((UINT8 *) Ent + sizeof (*(Ent)) + ((Ent)->IpCnt - 1) * sizeof (EFI_IPv4_ADDRESS))
 298
 299
 300 /**
 301   This function initialize the DHCP4 message instance.
 302
 303   This function will pad each item of dhcp4 message packet.
 304
 305   @param  Seed    Pointer to the message instance of the DHCP4 packet.
 306   @param  Udp4    Pointer to the EFI_UDP4_PROTOCOL instance.
 307
 308 **/
 309 VOID
 310 PxeBcInitSeedPacket (
 311   IN EFI_DHCP4_PACKET  *Seed,
 312   IN EFI_UDP4_PROTOCOL *Udp4
 313   );
 314
 315
 316 /**
 317   Parse the cached dhcp packet.
 318
 319   @param  CachedPacket  Pointer to cached dhcp packet.
 320
 321   @retval TRUE          Succeed to parse and validation.
 322   @retval FALSE         Fail to parse or validation.
 323
 324 **/
 325 BOOLEAN
 326 PxeBcParseCachedDhcpPacket (
 327   IN PXEBC_CACHED_DHCP4_PACKET  *CachedPacket
 328   );
 329
 330 /**
 331   This function is to check the selected proxy offer (include BINL dhcp offer and
 332   DHCP_ONLY offer ) and set the flag and copy the DHCP packets to the Pxe base code
 333   mode structure.
 334
 335   @param  Private          Pointer to PxeBc private data.
 336
 337   @retval EFI_SUCCESS      Operational successful.
 338   @retval EFI_NO_RESPONSE  Offer dhcp service failed.
 339
 340 **/
 341 EFI_STATUS
 342 PxeBcCheckSelectedOffer (
 343   IN PXEBC_PRIVATE_DATA  *Private
 344   );
 345
 346
 347 /**
 348   Callback routine.
 349
 350   EFI_DHCP4_CALLBACK is provided by the consumer of the EFI DHCPv4 Protocol driver
 351   to intercept events that occurred in the configuration process. This structure
 352   provides advanced control of each state transition of the DHCP process. The
 353   returned status code determines the behavior of the EFI DHCPv4 Protocol driver.
 354   There are three possible returned values, which are described in the following
 355   table.
 356
 357   @param  This                  Pointer to the EFI DHCPv4 Protocol instance that is used to
 358                                 configure this callback function.
 359   @param  Context               Pointer to the context that is initialized by
 360                                 EFI_DHCP4_PROTOCOL.Configure().
 361   @param  CurrentState          The current operational state of the EFI DHCPv4 Protocol
 362                                 driver.
 363   @param  Dhcp4Event            The event that occurs in the current state, which usually means a
 364                                 state transition.
 365   @param  Packet                The DHCP packet that is going to be sent or already received.
 366   @param  NewPacket             The packet that is used to replace the above Packet.
 367
 368   @retval EFI_SUCCESS           Tells the EFI DHCPv4 Protocol driver to continue the DHCP process.
 369   @retval EFI_NOT_READY         Only used in the Dhcp4Selecting state. The EFI DHCPv4 Protocol
 370                                 driver will continue to wait for more DHCPOFFER packets until the retry
 371                                 timeout expires.
 372   @retval EFI_ABORTED           Tells the EFI DHCPv4 Protocol driver to abort the current process and
 373                                 return to the Dhcp4Init or Dhcp4InitReboot state.
 374
 375 **/
 376 EFI_STATUS
 377 EFIAPI
 378 PxeBcDhcpCallBack (
 379   IN EFI_DHCP4_PROTOCOL                * This,
 380   IN VOID                              *Context,
 381   IN EFI_DHCP4_STATE                   CurrentState,
 382   IN EFI_DHCP4_EVENT                   Dhcp4Event,
 383   IN EFI_DHCP4_PACKET                  * Packet OPTIONAL,
 384   OUT EFI_DHCP4_PACKET                 **NewPacket OPTIONAL
 385   );
 386
 387
 388 /**
 389   Discover the boot of service and initialize the vendor option if exists.
 390
 391   @param  Private               Pointer to PxeBc private data.
 392   @param  Type                  PxeBc option boot item type
 393   @param  Layer                 PxeBc option boot item layer
 394   @param  UseBis                Use BIS or not
 395   @param  DestIp                Ip address for server
 396   @param  IpCount               The total count of the server ip address
 397   @param  SrvList               Server list
 398   @param  IsDiscv               Discover the vendor or not
 399   @param  Reply                 The dhcp4 packet of Pxe reply
 400
 401   @retval EFI_SUCCESS           Operation succeeds.
 402   @retval EFI_OUT_OF_RESOURCES  Allocate memory pool failed.
 403   @retval EFI_NOT_FOUND         There is no vendor option exists.
 404   @retval EFI_TIMEOUT           Send Pxe Discover time out.
 405
 406 **/
 407 EFI_STATUS
 408 PxeBcDiscvBootService (
 409   IN PXEBC_PRIVATE_DATA                * Private,
 410   IN UINT16                            Type,
 411   IN UINT16                            *Layer,
 412   IN BOOLEAN                           UseBis,
 413   IN EFI_IP_ADDRESS                    * DestIp,
 414   IN UINT16                            IpCount,
 415   IN EFI_PXE_BASE_CODE_SRVLIST         * SrvList,
 416   IN BOOLEAN                           IsDiscv,
 417   OUT EFI_DHCP4_PACKET                 * Reply OPTIONAL
 418   );
 419
 420
 421 /**
 422   Initialize the DHCP options and build the option list.
 423
 424   @param  Private          Pointer to PxeBc private data.
 425   @param  OptList          Pointer to a DHCP option list.
 426
 427   @param  IsDhcpDiscover   Discover dhcp option or not.
 428
 429   @return The index item number of the option list.
 430
 431 **/
 432 UINT32
 433 PxeBcBuildDhcpOptions (
 434   IN PXEBC_PRIVATE_DATA            *Private,
 435   IN EFI_DHCP4_PACKET_OPTION       **OptList,
 436   IN BOOLEAN                       IsDhcpDiscover
 437   );
 438
 439
 440 /**
 441   Create the boot options
 442
 443   @param  OptList    Pointer to the list of the options
 444   @param  Type       the type of option
 445   @param  Layer      the layer of the boot options
 446   @param  OptLen     length of opotion
 447
 448 **/
 449 VOID
 450 PxeBcCreateBootOptions (
 451   IN  EFI_DHCP4_PACKET_OPTION          *OptList,
 452   IN  UINT16                           Type,
 453   IN  UINT16                           *Layer,
 454   OUT UINT32                           *OptLen
 455   );
 456
 457
 458 /**
 459   Parse interested dhcp options.
 460
 461   @param  Buffer     Pointer to the dhcp options packet.
 462   @param  Length     The length of the dhcp options.
 463   @param  OptTag     The option OpCode.
 464
 465   @return NULL if the buffer length is 0 and OpCode is not
 466           PXEBC_DHCP4_TAG_EOP, or the pointer to the buffer.
 467
 468 **/
 469 EFI_DHCP4_PACKET_OPTION *
 470 PxeBcParseExtendOptions (
 471   IN UINT8                         *Buffer,
 472   IN UINT32                        Length,
 473   IN UINT8                         OptTag
 474   );
 475
 476
 477 /**
 478   This function is to parse and check vendor options.
 479
 480   @param  Dhcp4Option           Pointer to dhcp options
 481   @param  VendorOption          Pointer to vendor options
 482
 483   @return TRUE if valid for vendor options, or FALSE.
 484
 485 **/
 486 BOOLEAN
 487 PxeBcParseVendorOptions (
 488   IN EFI_DHCP4_PACKET_OPTION       *Dhcp4Option,
 489   IN PXEBC_VENDOR_OPTION           *VendorOption
 490   );
 491
 492
 493 /**
 494   Choose the boot prompt.
 495
 496   @param  Private              Pointer to PxeBc private data.
 497
 498   @retval EFI_SUCCESS          Select boot prompt done.
 499   @retval EFI_TIMEOUT          Select boot prompt time out.
 500   @retval EFI_NOT_FOUND        The proxy offer is not Pxe10.
 501   @retval EFI_ABORTED          User cancel the operation.
 502   @retval EFI_NOT_READY        Read the input key from the keybroad has not finish.
 503
 504 **/
 505 EFI_STATUS
 506 PxeBcSelectBootPrompt (
 507   IN PXEBC_PRIVATE_DATA              *Private
 508   );
 509
 510
 511 /**
 512   Select the boot menu.
 513
 514   @param  Private         Pointer to PxeBc private data.
 515   @param  Type            The type of the menu.
 516   @param  UseDefaultItem  Use default item or not.
 517
 518   @retval EFI_ABORTED     User cancel operation.
 519   @retval EFI_SUCCESS     Select the boot menu success.
 520   @retval EFI_NOT_READY   Read the input key from the keybroad has not finish.
 521
 522 **/
 523 EFI_STATUS
 524 PxeBcSelectBootMenu (
 525   IN  PXEBC_PRIVATE_DATA              *Private,
 526   OUT UINT16                          *Type,
 527   IN  BOOLEAN                         UseDefaultItem
 528   );
 529
 530 #endif
 531