/** @file
  EFI ARP Protocol Definition

  The EFI ARP Service Binding Protocol is used to locate EFI
  ARP Protocol drivers to create and destroy child of the
  driver to communicate with other host using ARP protocol.
  The EFI ARP Protocol provides services to map IP network
  address to hardware address used by a data link protocol.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Revision Reference:
  This Protocol was introduced in UEFI Specification 2.0.

**/

#ifndef __EFI_ARP_PROTOCOL_H__
#define __EFI_ARP_PROTOCOL_H__

FILE_LICENCE ( BSD2_PATENT );

#define EFI_ARP_SERVICE_BINDING_PROTOCOL_GUID \
  { \
    0xf44c00ee, 0x1f2c, 0x4a00, {0xaa, 0x9, 0x1c, 0x9f, 0x3e, 0x8, 0x0, 0xa3 } \
  }

#define EFI_ARP_PROTOCOL_GUID \
  { \
    0xf4b427bb, 0xba21, 0x4f16, {0xbc, 0x4e, 0x43, 0xe4, 0x16, 0xab, 0x61, 0x9c } \
  }

typedef struct _EFI_ARP_PROTOCOL EFI_ARP_PROTOCOL;

typedef struct {
  ///
  /// Length in bytes of this entry.
  ///
  UINT32     Size;

  ///
  /// Set to TRUE if this entry is a "deny" entry.
  /// Set to FALSE if this entry is a "normal" entry.
  ///
  BOOLEAN    DenyFlag;

  ///
  /// Set to TRUE if this entry will not time out.
  /// Set to FALSE if this entry will time out.
  ///
  BOOLEAN    StaticFlag;

  ///
  /// 16-bit ARP hardware identifier number.
  ///
  UINT16     HwAddressType;

  ///
  /// 16-bit protocol type number.
  ///
  UINT16     SwAddressType;

  ///
  /// The length of the hardware address.
  ///
  UINT8      HwAddressLength;

  ///
  /// The length of the protocol address.
  ///
  UINT8      SwAddressLength;
} EFI_ARP_FIND_DATA;

typedef struct {
  ///
  /// 16-bit protocol type number in host byte order.
  ///
  UINT16    SwAddressType;

  ///
  /// The length in bytes of the station's protocol address to register.
  ///
  UINT8     SwAddressLength;

  ///
  /// The pointer to the first byte of the protocol address to register. For
  /// example, if SwAddressType is 0x0800 (IP), then
  /// StationAddress points to the first byte of this station's IP
  /// address stored in network byte order.
  ///
  VOID      *StationAddress;

  ///
  /// The timeout value in 100-ns units that is associated with each
  /// new dynamic ARP cache entry. If it is set to zero, the value is
  /// implementation-specific.
  ///
  UINT32    EntryTimeOut;

  ///
  /// The number of retries before a MAC address is resolved. If it is
  /// set to zero, the value is implementation-specific.
  ///
  UINT32    RetryCount;

  ///
  /// The timeout value in 100-ns units that is used to wait for the ARP
  /// reply packet or the timeout value between two retries. Set to zero
  /// to use implementation-specific value.
  ///
  UINT32    RetryTimeOut;
} EFI_ARP_CONFIG_DATA;

/**
  This function is used to assign a station address to the ARP cache for this instance
  of the ARP driver.

  Each ARP instance has one station address. The EFI_ARP_PROTOCOL driver will
  respond to ARP requests that match this registered station address. A call to
  this function with the ConfigData field set to NULL will reset this ARP instance.

  Once a protocol type and station address have been assigned to this ARP instance,
  all the following ARP functions will use this information. Attempting to change
  the protocol type or station address to a configured ARP instance will result in errors.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.
  @param  ConfigData             The pointer to the EFI_ARP_CONFIG_DATA structure.

  @retval EFI_SUCCESS            The new station address was successfully
                                 registered.
  @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
                                 * This is NULL.
                                 * SwAddressLength is zero when ConfigData is not NULL.
                                 * StationAddress is NULL when ConfigData is not NULL.
  @retval EFI_ACCESS_DENIED      The SwAddressType, SwAddressLength, or
                                 StationAddress is different from the one that is
                                 already registered.
  @retval EFI_OUT_OF_RESOURCES   Storage for the new StationAddress could not be
                                 allocated.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_CONFIGURE)(
  IN EFI_ARP_PROTOCOL       *This,
  IN EFI_ARP_CONFIG_DATA    *ConfigData   OPTIONAL
  );

/**
  This function is used to insert entries into the ARP cache.

  ARP cache entries are typically inserted and updated by network protocol drivers
  as network traffic is processed. Most ARP cache entries will time out and be
  deleted if the network traffic stops. ARP cache entries that were inserted
  by the Add() function may be static (will not time out) or dynamic (will time out).
  Default ARP cache timeout values are not covered in most network protocol
  specifications (although RFC 1122 comes pretty close) and will only be
  discussed in general terms in this specification. The timeout values that are
  used in the EFI Sample Implementation should be used only as a guideline.
  Final product implementations of the EFI network stack should be tuned for
  their expected network environments.

  @param  This                   Pointer to the EFI_ARP_PROTOCOL instance.
  @param  DenyFlag               Set to TRUE if this entry is a deny entry. Set to
                                 FALSE if this  entry is a normal entry.
  @param  TargetSwAddress        Pointer to a protocol address to add (or deny).
                                 May be set to NULL if DenyFlag is TRUE.
  @param  TargetHwAddress        Pointer to a hardware address to add (or deny).
                                 May be set to NULL if DenyFlag is TRUE.
  @param  TimeoutValue           Time in 100-ns units that this entry will remain
                                 in the ARP cache. A value of zero means that the
                                 entry is permanent. A nonzero value will override
                                 the one given by Configure() if the entry to be
                                 added is a dynamic entry.
  @param  Overwrite              If TRUE, the matching cache entry will be
                                 overwritten with the supplied parameters. If
                                 FALSE, EFI_ACCESS_DENIED is returned if the
                                 corresponding cache entry already exists.

  @retval EFI_SUCCESS            The entry has been added or updated.
  @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
                                 * This is NULL.
                                 * DenyFlag is FALSE and TargetHwAddress is NULL.
                                 * DenyFlag is FALSE and TargetSwAddress is NULL.
                                 * TargetHwAddress is NULL and TargetSwAddress is NULL.
                                 * Neither TargetSwAddress nor TargetHwAddress are NULL when DenyFlag is
                                 TRUE.
  @retval EFI_OUT_OF_RESOURCES   The new ARP cache entry could not be allocated.
  @retval EFI_ACCESS_DENIED      The ARP cache entry already exists and Overwrite
                                 is not true.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_ADD)(
  IN EFI_ARP_PROTOCOL       *This,
  IN BOOLEAN                DenyFlag,
  IN VOID                   *TargetSwAddress  OPTIONAL,
  IN VOID                   *TargetHwAddress  OPTIONAL,
  IN UINT32                 TimeoutValue,
  IN BOOLEAN                Overwrite
  );

/**
  This function searches the ARP cache for matching entries and allocates a buffer into
  which those entries are copied.

  The first part of the allocated buffer is EFI_ARP_FIND_DATA, following which
  are protocol address pairs and hardware address pairs.
  When finding a specific protocol address (BySwAddress is TRUE and AddressBuffer
  is not NULL), the ARP cache timeout for the found entry is reset if Refresh is
  set to TRUE. If the found ARP cache entry is a permanent entry, it is not
  affected by Refresh.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.
  @param  BySwAddress            Set to TRUE to look for matching software protocol
                                 addresses. Set to FALSE to look for matching
                                 hardware protocol addresses.
  @param  AddressBuffer          The pointer to the address buffer. Set to NULL
                                 to match all addresses.
  @param  EntryLength            The size of an entry in the entries buffer.
  @param  EntryCount             The number of ARP cache entries that are found by
                                 the specified criteria.
  @param  Entries                The pointer to the buffer that will receive the ARP
                                 cache entries.
  @param  Refresh                Set to TRUE to refresh the timeout value of the
                                 matching ARP cache entry.

  @retval EFI_SUCCESS            The requested ARP cache entries were copied into
                                 the buffer.
  @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
                                 This is NULL. Both EntryCount and EntryLength are
                                 NULL, when Refresh is FALSE.
  @retval EFI_NOT_FOUND          No matching entries were found.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_FIND)(
  IN EFI_ARP_PROTOCOL       *This,
  IN BOOLEAN                BySwAddress,
  IN VOID                   *AddressBuffer    OPTIONAL,
  OUT UINT32                *EntryLength      OPTIONAL,
  OUT UINT32                *EntryCount       OPTIONAL,
  OUT EFI_ARP_FIND_DATA     **Entries         OPTIONAL,
  IN BOOLEAN                Refresh
  );

/**
  This function removes specified ARP cache entries.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.
  @param  BySwAddress            Set to TRUE to delete matching protocol addresses.
                                 Set to FALSE to delete matching hardware
                                 addresses.
  @param  AddressBuffer          The pointer to the address buffer that is used as a
                                 key to look for the cache entry. Set to NULL to
                                 delete all entries.

  @retval EFI_SUCCESS            The entry was removed from the ARP cache.
  @retval EFI_INVALID_PARAMETER  This is NULL.
  @retval EFI_NOT_FOUND          The specified deletion key was not found.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_DELETE)(
  IN EFI_ARP_PROTOCOL       *This,
  IN BOOLEAN                BySwAddress,
  IN VOID                   *AddressBuffer   OPTIONAL
  );

/**
  This function delete all dynamic entries from the ARP cache that match the specified
  software protocol type.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.

  @retval EFI_SUCCESS            The cache has been flushed.
  @retval EFI_INVALID_PARAMETER  This is NULL.
  @retval EFI_NOT_FOUND          There are no matching dynamic cache entries.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_FLUSH)(
  IN EFI_ARP_PROTOCOL       *This
  );

/**
  This function tries to resolve the TargetSwAddress and optionally returns a
  TargetHwAddress if it already exists in the ARP cache.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.
  @param  TargetSwAddress        The pointer to the protocol address to resolve.
  @param  ResolvedEvent          The pointer to the event that will be signaled when
                                 the address is resolved or some error occurs.
  @param  TargetHwAddress        The pointer to the buffer for the resolved hardware
                                 address in network byte order.

  @retval EFI_SUCCESS            The data is copied from the ARP cache into the
                                 TargetHwAddress buffer.
  @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
                                 This is NULL. TargetHwAddress is NULL.
  @retval EFI_ACCESS_DENIED      The requested address is not present in the normal
                                 ARP cache but is present in the deny address list.
                                 Outgoing traffic to that address is forbidden.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.
  @retval EFI_NOT_READY          The request has been started and is not finished.

**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_REQUEST)(
  IN EFI_ARP_PROTOCOL       *This,
  IN VOID                   *TargetSwAddress  OPTIONAL,
  IN EFI_EVENT              ResolvedEvent     OPTIONAL,
  OUT VOID                  *TargetHwAddress
  );

/**
  This function aborts the previous ARP request (identified by This, TargetSwAddress
  and ResolvedEvent) that is issued by EFI_ARP_PROTOCOL.Request().

  If the request is in the internal ARP request queue, the request is aborted
  immediately and its ResolvedEvent is signaled. Only an asynchronous address
  request needs to be canceled. If TargeSwAddress and ResolveEvent are both
  NULL, all the pending asynchronous requests that have been issued by This
  instance will be cancelled and their corresponding events will be signaled.

  @param  This                   The pointer to the EFI_ARP_PROTOCOL instance.
  @param  TargetSwAddress        The pointer to the protocol address in previous
                                 request session.
  @param  ResolvedEvent          Pointer to the event that is used as the
                                 notification event in previous request session.

  @retval EFI_SUCCESS            The pending request session(s) is/are aborted and
                                 corresponding event(s) is/are signaled.
  @retval EFI_INVALID_PARAMETER  One or more of the following conditions is TRUE:
                                 This is NULL. TargetSwAddress is not NULL and
                                 ResolvedEvent is NULL. TargetSwAddress is NULL and
                                 ResolvedEvent is not NULL.
  @retval EFI_NOT_STARTED        The ARP driver instance has not been configured.
  @retval EFI_NOT_FOUND          The request is not issued by
                                 EFI_ARP_PROTOCOL.Request().


**/
typedef
EFI_STATUS
(EFIAPI *EFI_ARP_CANCEL)(
  IN EFI_ARP_PROTOCOL       *This,
  IN VOID                   *TargetSwAddress  OPTIONAL,
  IN EFI_EVENT              ResolvedEvent     OPTIONAL
  );

///
/// ARP is used to resolve local network protocol addresses into
/// network hardware addresses.
///
struct _EFI_ARP_PROTOCOL {
  EFI_ARP_CONFIGURE    Configure;
  EFI_ARP_ADD          Add;
  EFI_ARP_FIND         Find;
  EFI_ARP_DELETE       Delete;
  EFI_ARP_FLUSH        Flush;
  EFI_ARP_REQUEST      Request;
  EFI_ARP_CANCEL       Cancel;
};

extern EFI_GUID  gEfiArpServiceBindingProtocolGuid;
extern EFI_GUID  gEfiArpProtocolGuid;

#endif
