source: vbox/trunk/src/VBox/Devices/EFI/FirmwareNew/NetworkPkg/Ip6Dxe/Ip6Mld.h@ 80721

/** @file
  Multicast Listener Discovery support routines.

  Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __EFI_IP6_MLD_H__
#define __EFI_IP6_MLD_H__

#define IP6_UNSOLICITED_REPORT_INTERVAL 10

#pragma pack(1)
typedef struct {
  IP6_ICMP_HEAD           Head;
  UINT16                  MaxRespDelay;
  UINT16                  Reserved;
  EFI_IPv6_ADDRESS        Group;
} IP6_MLD_HEAD;
#pragma pack()

//
// The status of multicast group. It isn't necessary to maintain
// explicit state of host state diagram. A group with finity
// DelayTime (less than 0xffffffff) is in "delaying listener" state. otherwise, it is in
// "idle listener" state.
//
typedef struct {
  LIST_ENTRY              Link;
  INTN                    RefCnt;
  EFI_IPv6_ADDRESS        Address;
  UINT32                  DelayTimer;
  BOOLEAN                 SendByUs;
  EFI_MAC_ADDRESS         Mac;
} IP6_MLD_GROUP;

//
// The MLD status. Each IP6 service instance has a MLD_SERVICE_DATA
// attached. The Mldv1QuerySeen remember whether the server on this
// connected network is v1 or v2.
//
typedef struct {
  INTN                    Mldv1QuerySeen;
  LIST_ENTRY              Groups;
} IP6_MLD_SERVICE_DATA;

/**
  Search a IP6_MLD_GROUP list entry node from a list array.

  @param[in]       IpSb          Points to an IP6 service binding instance.
  @param[in]       MulticastAddr The IPv6 multicast address to be searched.

  @return The found IP6_ML_GROUP list entry or NULL.

**/
IP6_MLD_GROUP *
Ip6FindMldEntry (
  IN IP6_SERVICE            *IpSb,
  IN EFI_IPv6_ADDRESS       *MulticastAddr
  );

/**
  Init the MLD data of the IP6 service instance, configure
  MNP to receive ALL SYSTEM multicasts.

  @param[in]  IpSb              The IP6 service whose MLD is to be initialized.

  @retval EFI_OUT_OF_RESOURCES  There are not sufficient resources to complete the
                                operation.
  @retval EFI_SUCCESS           The MLD module successfully initialized.

**/
EFI_STATUS
Ip6InitMld (
  IN IP6_SERVICE            *IpSb
  );

/**
  Join the multicast group on behalf of this IP6 service binding instance.

  @param[in]  IpSb               The IP6 service binding instance.
  @param[in]  Interface          Points to an IP6_INTERFACE structure.
  @param[in]  Address            The group address to join.

  @retval EFI_SUCCESS            Successfully joined the multicast group.
  @retval EFI_OUT_OF_RESOURCES   Failed to allocate resources.
  @retval Others                 Failed to join the multicast group.

**/
EFI_STATUS
Ip6JoinGroup (
  IN IP6_SERVICE            *IpSb,
  IN IP6_INTERFACE          *Interface,
  IN EFI_IPv6_ADDRESS       *Address
  );

/**
  Leave the IP6 multicast group.

  @param[in]  IpSb               The IP6 service binding instance.
  @param[in]  Address            The group address to leave.

  @retval EFI_NOT_FOUND          The IP6 service instance isn't in the group.
  @retval EFI_SUCCESS            Successfully left the multicast group.
  @retval Others                 Failed to leave the multicast group.

**/
EFI_STATUS
Ip6LeaveGroup (
 IN IP6_SERVICE            *IpSb,
 IN EFI_IPv6_ADDRESS       *Address
  );

/**
  Worker function for EfiIp6Groups(). The caller
  should verify that the parameters are valid.

  @param[in]  IpInstance        The IP6 child to change the setting.
  @param[in]  JoinFlag          TRUE to join the group, otherwise leave it.
  @param[in]  GroupAddress      The target group address. If NULL, leave all
                                the group addresses.

  @retval EFI_ALREADY_STARTED   Wants to join the group, but is already a member of it.
  @retval EFI_OUT_OF_RESOURCES  Failed to allocate some resources.
  @retval EFI_DEVICE_ERROR      Failed to set the group configuraton.
  @retval EFI_SUCCESS           Successfully updated the group setting.
  @retval EFI_NOT_FOUND         Tried to leave a group of whom it isn't a member.

**/
EFI_STATUS
Ip6Groups (
  IN IP6_PROTOCOL           *IpInstance,
  IN BOOLEAN                JoinFlag,
  IN EFI_IPv6_ADDRESS       *GroupAddress       OPTIONAL
  );

/**
  Process the Multicast Listener Query message.

  @param[in]  IpSb               The IP service that received the packet.
  @param[in]  Head               The IP head of the MLD query packet.
  @param[in]  Packet             The content of the MLD query packet with IP head
                                 removed.

  @retval EFI_SUCCESS            The MLD query packet processed successfully.
  @retval EFI_INVALID_PARAMETER  The packet is invalid.
  @retval Others                 Failed to process the packet.

**/
EFI_STATUS
Ip6ProcessMldQuery (
  IN IP6_SERVICE            *IpSb,
  IN EFI_IP6_HEADER         *Head,
  IN NET_BUF                *Packet
  );

/**
  Process the Multicast Listener Report message.

  @param[in]  IpSb               The IP service that received the packet.
  @param[in]  Head               The IP head of the MLD report packet.
  @param[in]  Packet             The content of the MLD report packet with IP head
                                 removed.

  @retval EFI_SUCCESS            The MLD report packet processed successfully.
  @retval EFI_INVALID_PARAMETER  The packet is invalid.

**/
EFI_STATUS
Ip6ProcessMldReport (
  IN IP6_SERVICE            *IpSb,
  IN EFI_IP6_HEADER         *Head,
  IN NET_BUF                *Packet
  );


/**
  The heartbeat timer of the MLD module. It sends out solicited MLD report when
  DelayTimer expires.

  @param[in]  IpSb              The IP6 service binding instance.

**/
VOID
Ip6MldTimerTicking (
  IN IP6_SERVICE            *IpSb
  );

#endif