src/devices/mesh/dot11s/peer-manager-protocol.h
author Kirill Andreev <andreev@iitp.ru>
Wed, 25 Mar 2009 12:23:12 +0300
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/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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 * Copyright (c) 2008,2009 IITP RAS
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation;
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * Authors: Kirill Andreev <andreev@iitp.ru>
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 *          Aleksey Kovalenko <kovalenko@iitp.ru>
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 */
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#ifndef DOT11S_PEER_MAN_H
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#define DOT11S_PEER_MAN_H
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#include "ns3/mac48-address.h"
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#include "ns3/wifi-net-device.h"
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#include "ns3/ie-dot11s-peer-management.h"
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#include "ns3/ie-dot11s-beacon-timing.h"
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#include "ns3/ie-dot11s-configuration.h"
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#include "ns3/event-id.h"
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#include <list>
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#include <map>
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namespace ns3 {
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namespace dot11s {
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class PeerManagerMacPlugin;
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class PeerLink;
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/**
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 * \ingroup dot11s
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 */
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class PeerManagerProtocol : public Object
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{
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public:
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  PeerManagerProtocol ();
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  ~PeerManagerProtocol ();
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  static TypeId GetTypeId ();
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  bool AttachInterfaces(std::vector<Ptr<WifiNetDevice> >);
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  /** \brief Methods that handle beacon sending/receiving procedure.
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   * This methods interact with MAC_layer plug-in
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   * \{
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   */
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  /**
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   * \brief When we are sending a beacon - we fill beacon timing
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   * element
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   * \param IeBeaconTiming is a beacon timing element that
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   * should be present in beacon
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   * \param interface is a interface sending a beacon
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   */
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  Ptr<IeBeaconTiming> GetBeaconTimingElement(uint32_t interface);
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  /**
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   * \brief When we receive a beacon from peer-station, we remember
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   * its beacon timing element (needed for peer choosing mechanism),
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   * and remember beacon timers - last beacon and beacon interval to
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   * detect beacon loss and cancel links
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   * \param interface is a interface on which beacon was received
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   * \param timingElement is a timing element of remote beacon
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   */
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  void UpdatePeerBeaconTiming(
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      uint32_t interface,
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      bool meshBeacon,
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      IeBeaconTiming timingElement,
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      Mac48Address peerAddress,
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      Time receivingTime,
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      Time beaconInterval
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      );
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  /**
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   * \}
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   */
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  /**
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   * \brief Methods that handle Peer link management frames
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   * interaction:
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   * \{
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   */
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  /**
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   * Deliver Peer link management information to the protocol-part
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   * \param void is returning value - we pass a frame and forget
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   * about it
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   * \param uint32_t - is a interface ID of a given MAC (interfaceID rather
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   * than MAC address, beacause many interfaces may have the same MAC)
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   * \param Mac48Address is address of peer
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   * \param uint16_t is association ID, which peer has assigned to
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   * us
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   * \param IeConfiguration is mesh configuration element
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   * taken from the peer management frame
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   * \param IePeerManagement is peer link management element
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   */
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  void ReceivePeerLinkFrame(
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      uint32_t interface,
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      Mac48Address peerAddress,
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      uint16_t aid,
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      IePeerManagement peerManagementElement,
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      IeConfiguration meshConfig
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      );
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  /**
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   * Cancell peer link due to broken configuration (SSID or Supported
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   * rates)
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   */
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  void ConfigurationMismatch (uint32_t interface, Mac48Address peerAddress);
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  /**
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   * Checks if there is established link
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   */
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  bool IsActiveLink (uint32_t interface, Mac48Address peerAddress);
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  /**
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   * \}
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   */
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private:
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  ///\name Private structures
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  ///\{
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  ///\brief keeps information about beacon of peer station:
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  /// beacon interval, association ID, last time we have received a
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  /// beacon
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  struct BeaconInfo
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  {
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    uint16_t aid; //Assoc ID
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    Time referenceTbtt; //When one of my station's beacons was put into a beacon queue;
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    Time beaconInterval; //Beacon interval of my station;
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  };
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  /// We keep a vector of pointers to PeerLink class. This vector
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  /// keeps all peer links at a given interface.
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  typedef std::vector<Ptr<PeerLink> > PeerLinksOnInterface;
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  /// This map keeps all peer links.
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  ///\param uint32_t is interface ID
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  typedef std::map<uint32_t, PeerLinksOnInterface>  PeerLinksMap;
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  ///\brief This map keeps relationship between peer address and its
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  /// beacon information
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  typedef std::map<Mac48Address, BeaconInfo>  BeaconsOnInterface;
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  ///\brief This map keeps beacon information on all intefaces
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  typedef std::map<uint32_t, BeaconsOnInterface> BeaconInfoMap;
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  ///\brief this vector keeps pointers to MAC-plugins
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  typedef std::map<uint32_t, Ptr<PeerManagerMacPlugin> > PeerManagerPluginMap;
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  ///\}
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private:
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  /**
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   * Return a position in beacon-storage for a given remote station
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   */
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  void FillBeaconInfo(uint32_t interface, Mac48Address peerAddress, Time receivingTime, Time beaconInterval);
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  Ptr<PeerLink> InitiateLink (uint32_t interface, Mac48Address peerAddress, Time lastBeacon, Time beaconInterval);
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  /**
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   * \name External peer-chooser
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   * \{
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   */
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  bool ShouldSendOpen (uint32_t interface, Mac48Address peerAddress);
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  bool ShouldAcceptOpen (uint32_t interface, Mac48Address peerAddress, dot11sReasonCode & reasonCode);
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  /**
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   * \}
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   * \brief Indicates changes in peer links
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   */
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  void PeerLinkStatus (uint32_t interface, Mac48Address peerAddress, bool status);
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  /**
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   * Removes all links which are idle
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   */
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  void  PeerCleanup ();
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private:
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  PeerManagerPluginMap m_plugins;
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  /**
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   * \name Information related to beacons:
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   * \{
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   */
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  BeaconInfoMap m_neighbourBeacons;
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  static const uint8_t m_maxBeaconLoss = 3;
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  ///\}
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  uint16_t m_lastAssocId;
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  uint16_t m_lastLocalLinkId;
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  uint8_t m_numberOfActivePeers; //number of established peer links
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  uint8_t m_maxNumberOfPeerLinks;
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  /**
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   * Peer Links
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   * \{
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   */
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  PeerLinksMap m_peerLinks;
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  /**
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   * \}
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   */
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  /**
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   * Periodically we scan the peer manager list of peers
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   * and check if the too many  beacons were lost:
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   * \{
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   */
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  Time  m_peerLinkCleanupPeriod;
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  EventId  m_cleanupEvent;
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  /**
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   * \}
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   */
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};
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} // namespace dot11s
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} //namespace ns3
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#endif