arp-cache.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2006 INRIA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
 */
#ifndef ARP_CACHE_H
#define ARP_CACHE_H

#include <stdint.h>
#include <list>
#include "ns3/simulator.h"
#include "ns3/callback.h"
#include "ns3/packet.h"
#include "ns3/nstime.h"
#include "ns3/net-device.h"
#include "ns3/ipv4-address.h"
#include "ns3/address.h"
#include "ns3/ptr.h"
#include "ns3/object.h"
#include "ns3/traced-callback.h"
#include "ns3/sgi-hashmap.h"

namespace ns3 {

class NetDevice;
class Ipv4Interface;

class ArpCache : public Object
{
private:
  ArpCache (ArpCache const &);
  ArpCache& operator= (ArpCache const &);

public:
  static TypeId GetTypeId (void);
  class Entry;
  ArpCache ();
  ~ArpCache ();

  void SetDevice (Ptr<NetDevice> device, Ptr<Ipv4Interface> interface);
  Ptr<NetDevice> GetDevice (void) const;
  Ptr<Ipv4Interface> GetInterface (void) const;

  void SetAliveTimeout (Time aliveTimeout);
  void SetDeadTimeout (Time deadTimeout);
  void SetWaitReplyTimeout (Time waitReplyTimeout);

  Time GetAliveTimeout (void) const;
  Time GetDeadTimeout (void) const;
  Time GetWaitReplyTimeout (void) const;

  void SetArpRequestCallback (Callback<void, Ptr<const ArpCache>, 
                                       Ipv4Address> arpRequestCallback);
  void StartWaitReplyTimer (void);
  ArpCache::Entry *Lookup (Ipv4Address destination);
  ArpCache::Entry *Add (Ipv4Address to);
  void Flush (void);

  class Entry {
public:
    Entry (ArpCache *arp);

    void MarkDead (void);
    void MarkAlive (Address macAddress);
    void MarkWaitReply (Ptr<Packet> waiting);
    bool UpdateWaitReply (Ptr<Packet> waiting);
    bool IsDead (void);
    bool IsAlive (void);
    bool IsWaitReply (void);

    Address GetMacAddress (void) const;
    Ipv4Address GetIpv4Address (void) const;
    void SetIpv4Address (Ipv4Address destination);
    bool IsExpired (void) const;
    Ptr<Packet> DequeuePending (void);
    uint32_t GetRetries (void) const;
    void IncrementRetries (void);
    void ClearRetries (void);

private:
    enum ArpCacheEntryState_e {
      ALIVE,
      WAIT_REPLY,
      DEAD
    };

    void UpdateSeen (void);

    Time GetTimeout (void) const;

    ArpCache *m_arp; 
    ArpCacheEntryState_e m_state; 
    Time m_lastSeen; 
    Address m_macAddress; 
    Ipv4Address m_ipv4Address; 
    std::list<Ptr<Packet> > m_pending; 
    uint32_t m_retries; 
  };

private:
  typedef sgi::hash_map<Ipv4Address, ArpCache::Entry *, Ipv4AddressHash> Cache;
  typedef sgi::hash_map<Ipv4Address, ArpCache::Entry *, Ipv4AddressHash>::iterator CacheI;

  virtual void DoDispose (void);

  Ptr<NetDevice> m_device; 
  Ptr<Ipv4Interface> m_interface; 
  Time m_aliveTimeout; 
  Time m_deadTimeout; 
  Time m_waitReplyTimeout; 
  EventId m_waitReplyTimer;  
  Callback<void, Ptr<const ArpCache>, Ipv4Address> m_arpRequestCallback;  
  uint32_t m_maxRetries; 

  void HandleWaitReplyTimeout (void);
  uint32_t m_pendingQueueSize; 
  Cache m_arpCache; 
  TracedCallback<Ptr<const Packet> > m_dropTrace; 
};


} // namespace ns3

#endif /* ARP_CACHE_H */