/** @file
  Functions declaration related with DHCPv4 for HTTP boot driver.

Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under 
the terms and conditions of the BSD License that accompanies this distribution.  
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.                                          
    
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef __EFI_UEFI_HTTP_BOOT_DHCP4_H__
#define __EFI_UEFI_HTTP_BOOT_DHCP4_H__

#define HTTP_BOOT_DHCP4_OPTION_MAX_NUM         16
#define HTTP_BOOT_DHCP4_OPTION_MAX_SIZE        312
#define HTTP_BOOT_DHCP4_PACKET_MAX_SIZE        1472

#define HTTP_BOOT_DHCP4_OPCODE_REQUEST         1
#define HTTP_BOOT_DHCP4_OPCODE_REPLY           2
#define HTTP_BOOT_DHCP4_MSG_TYPE_REQUEST       3
#define HTTP_BOOT_DHCP4_MAGIC                  0x63538263 // network byte order

#define HTTP_BOOT_DHCP4_OVERLOAD_FILE          1
#define HTTP_BOOT_DHCP4_OVERLOAD_SERVER_NAME   2

///
/// HTTP Tag definition that identifies the processor 
/// and programming environment of the client system.
/// These identifiers are defined by IETF:
/// http://www.ietf.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xml
///
#if defined (MDE_CPU_IA32)
#define EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE    HTTP_CLIENT_ARCH_IA32
#elif defined (MDE_CPU_X64)
#define EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE    HTTP_CLIENT_ARCH_X64
#elif defined (MDE_CPU_ARM)
#define EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE    HTTP_CLIENT_ARCH_ARM
#elif defined (MDE_CPU_AARCH64)
#define EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE    HTTP_CLIENT_ARCH_AARCH64
#elif defined (MDE_CPU_EBC)
#define EFI_HTTP_BOOT_CLIENT_SYSTEM_ARCHITECTURE    HTTP_CLIENT_ARCH_EBC
#endif

/// DHCP offer types among HTTP boot.
/// Dhcp4 and Dhcp6 share this definition, and corresponding
/// relatioinship is as follows:
///   Dhcp4Discover <> Dhcp6Solicit
///   Dhcp4Offer    <> Dhcp6Advertise
///   Dhcp4Request  <> Dhcp6Request
///   Dhcp4Ack      <> DHcp6Reply
///
typedef enum {
  //
  // <IP address, IP expressed URI>
  //
  HttpOfferTypeDhcpIpUri,
  //
  // <IP address, IP expressed URI, Name-server>
  //
  HttpOfferTypeDhcpIpUriDns,
  //
  // <IP address, Domain-name expressed URI, Name-server>
  //
  HttpOfferTypeDhcpNameUriDns,
  //
  // <IP address, Name-server>
  //
  HttpOfferTypeDhcpDns,
  //
  // <IP address>
  //
  HttpOfferTypeDhcpOnly,
  //
  // <Domain-name expressed URI> or
  // <Domain-name expressed URI, Name-server (will be ignored)>
  //
  HttpOfferTypeProxyNameUri,
  //
  // <IP expressed URI> or
  // <IP expressed URI, Name-server (will be ignored)>
  //
  HttpOfferTypeProxyIpUri,
  //
  // <IP address, Domain-name expressed URI>
  //
  HttpOfferTypeDhcpNameUri,
  HttpOfferTypeMax
} HTTP_BOOT_OFFER_TYPE;

#define HTTP_BOOT_DHCP_RETRIES            4
#define HTTP_BOOT_OFFER_MAX_NUM           16

// The array index of the DHCP4 option tag interested
//
#define HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE_LEN 0
#define HTTP_BOOT_DHCP4_TAG_INDEX_OVERLOAD     1
#define HTTP_BOOT_DHCP4_TAG_INDEX_MSG_TYPE     2
#define HTTP_BOOT_DHCP4_TAG_INDEX_SERVER_ID    3
#define HTTP_BOOT_DHCP4_TAG_INDEX_CLASS_ID     4
#define HTTP_BOOT_DHCP4_TAG_INDEX_BOOTFILE     5
#define HTTP_BOOT_DHCP4_TAG_INDEX_DNS_SERVER   6
#define HTTP_BOOT_DHCP4_TAG_INDEX_MAX          7

#pragma pack(1)

typedef struct {
  UINT8 ParaList[135];
} HTTP_BOOT_DHCP4_OPTION_PARA;

typedef struct {
  UINT16  Size;
} HTTP_BOOT_DHCP4_OPTION_MAX_MESG_SIZE;

typedef struct {
  UINT8 Type;
  UINT8 MajorVer;
  UINT8 MinorVer;
} HTTP_BOOT_DHCP4_OPTION_UNDI;

typedef struct {
  UINT8 Type;
} HTTP_BOOT_DHCP4_OPTION_MESG;

typedef struct {
  UINT16 Type;
} HTTP_BOOT_DHCP4_OPTION_ARCH;

typedef struct {
  UINT8 ClassIdentifier[11];
  UINT8 ArchitecturePrefix[5];
  UINT8 ArchitectureType[5];
  UINT8 Lit3[1];
  UINT8 InterfaceName[4];
  UINT8 Lit4[1];
  UINT8 UndiMajor[3];
  UINT8 UndiMinor[3];
} HTTP_BOOT_DHCP4_OPTION_CLID;

typedef struct {
  UINT8 Type;
  UINT8 Guid[16];
} HTTP_BOOT_DHCP4_OPTION_UUID;

typedef struct {
  UINT16 Type;
  UINT16 Layer;
} HTTP_BOOT_OPTION_BOOT_ITEM;

#pragma pack()

typedef union {
  HTTP_BOOT_DHCP4_OPTION_PARA           *Para;
  HTTP_BOOT_DHCP4_OPTION_UNDI           *Undi;
  HTTP_BOOT_DHCP4_OPTION_ARCH           *Arch;
  HTTP_BOOT_DHCP4_OPTION_CLID           *Clid;
  HTTP_BOOT_DHCP4_OPTION_UUID           *Uuid;
  HTTP_BOOT_DHCP4_OPTION_MESG           *Mesg;
  HTTP_BOOT_DHCP4_OPTION_MAX_MESG_SIZE  *MaxMesgSize;
} HTTP_BOOT_DHCP4_OPTION_ENTRY;

#define GET_NEXT_DHCP_OPTION(Opt) \
  (EFI_DHCP4_PACKET_OPTION *) ((UINT8 *) (Opt) + \
   sizeof (EFI_DHCP4_PACKET_OPTION) + (Opt)->Length - 1)

#define GET_OPTION_BUFFER_LEN(Pkt) \
  ((Pkt)->Length - sizeof (EFI_DHCP4_HEADER) - 4)

#define DEFAULT_CLASS_ID_DATA "HTTPClient:Arch:xxxxx:UNDI:003000"
#define DEFAULT_UNDI_TYPE     1
#define DEFAULT_UNDI_MAJOR    3
#define DEFAULT_UNDI_MINOR    0

typedef struct {
  UINT32         Reserved;
} HTTP_BOOT_VENDOR_OPTION;

#define HTTP_CACHED_DHCP4_PACKET_MAX_SIZE  (OFFSET_OF (EFI_DHCP4_PACKET, Dhcp4) + HTTP_BOOT_DHCP4_PACKET_MAX_SIZE)

typedef union {
  EFI_DHCP4_PACKET        Offer;
  EFI_DHCP4_PACKET        Ack;
  UINT8                   Buffer[HTTP_CACHED_DHCP4_PACKET_MAX_SIZE];
} HTTP_BOOT_DHCP4_PACKET;

typedef struct {
  //
  // URI component
  //
  CHAR8                   *Scheme;
  CHAR8                   *Authority;
  CHAR8                   *Path;
  CHAR8                   *Query;
  CHAR8                   *Fragment; /// TODO: may not required in HTTP URL

  CHAR8                   *RegName; /// Point to somewhere in Authority
  BOOLEAN                 AddrIsOk;
  EFI_IP_ADDRESS          Address;
  UINT16                  Port;
} HTTP_BOOT_URI_CONTENT;

typedef struct {
  HTTP_BOOT_DHCP4_PACKET      Packet;
  HTTP_BOOT_OFFER_TYPE        OfferType;
  VOID                        *UriParser;
  EFI_DHCP4_PACKET_OPTION     *OptList[HTTP_BOOT_DHCP4_TAG_INDEX_MAX];
} HTTP_BOOT_DHCP4_PACKET_CACHE;

/**
  Select an DHCPv4 or DHCP6 offer, and record SelectIndex and SelectProxyType.

  @param[in]  Private             Pointer to HTTP boot driver private data.

**/
VOID
HttpBootSelectDhcpOffer (
  IN HTTP_BOOT_PRIVATE_DATA  *Private
  );

/**
  Start the D.O.R.A DHCPv4 process to acquire the IPv4 address and other Http boot information.

  @param[in]  Private           Pointer to HTTP_BOOT private data.

  @retval EFI_SUCCESS           The D.O.R.A process successfully finished.
  @retval Others                Failed to finish the D.O.R.A process.

**/
EFI_STATUS
HttpBootDhcp4Dora (
  IN HTTP_BOOT_PRIVATE_DATA         *Private
  );

/**
  This function will register the default DNS addresses to the network device.
  
  @param[in]  Private             The pointer to HTTP_BOOT_PRIVATE_DATA.
  @param[in]  DataLength          Size of the buffer pointed to by DnsServerData in bytes.
  @param[in]  DnsServerData       Point a list of DNS server address in an array
                                  of EFI_IPv4_ADDRESS instances.

  @retval     EFI_SUCCESS         The DNS configuration has been configured successfully.
  @retval     Others              Failed to configure the address.

**/
EFI_STATUS
HttpBootRegisterIp4Dns (
  IN HTTP_BOOT_PRIVATE_DATA         *Private,
  IN UINTN                          DataLength,
  IN VOID                           *DnsServerData
  );

#endif