235 lines
6.6 KiB
C++
235 lines
6.6 KiB
C++
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2006 INRIA
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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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* Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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*/
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#ifndef ARP_CACHE_H
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#define ARP_CACHE_H
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#include <stdint.h>
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#include <list>
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#include "ns3/simulator.h"
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#include "ns3/callback.h"
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#include "ns3/packet.h"
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#include "ns3/nstime.h"
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#include "ns3/net-device.h"
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#include "ns3/ipv4-address.h"
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#include "ns3/address.h"
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#include "ns3/ptr.h"
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#include "ns3/object.h"
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#include "ns3/traced-callback.h"
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#include "ns3/sgi-hashmap.h"
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namespace ns3 {
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class NetDevice;
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class Ipv4Interface;
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/**
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* \ingroup arp
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* \brief An ARP cache
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*
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* A cached lookup table for translating layer 3 addresses to layer 2.
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* This implementation does lookups from IPv4 to a MAC address
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*/
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class ArpCache : public Object
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{
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public:
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static TypeId GetTypeId (void);
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class Entry;
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ArpCache ();
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~ArpCache ();
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/**
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* \param device The hardware NetDevice associated with this ARP chache
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* \param interface the Ipv4Interface associated with this ARP chache
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*/
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void SetDevice (Ptr<NetDevice> device, Ptr<Ipv4Interface> interface);
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/**
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* \return The NetDevice that this ARP cache is associated with
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*/
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Ptr<NetDevice> GetDevice (void) const;
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/**
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* \return the Ipv4Interface that this ARP cache is associated with
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*/
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Ptr<Ipv4Interface> GetInterface (void) const;
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void SetAliveTimeout (Time aliveTimeout);
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void SetDeadTimeout (Time deadTimeout);
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void SetWaitReplyTimeout (Time waitReplyTimeout);
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Time GetAliveTimeout (void) const;
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Time GetDeadTimeout (void) const;
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Time GetWaitReplyTimeout (void) const;
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/**
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* This callback is set when the ArpCache is set up and allows
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* the cache to generate an Arp request when the WaitReply
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* time expires and a retransmission must be sent
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*
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* \param arpRequestCallback Callback for transmitting an Arp request.
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*/
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void SetArpRequestCallback (Callback<void, Ptr<const ArpCache>,
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Ipv4Address> arpRequestCallback);
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/**
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* This method will schedule a timeout at WaitReplyTimeout interval
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* in the future, unless a timer is already running for the cache,
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* in which case this method does nothing.
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*/
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void StartWaitReplyTimer (void);
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/**
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* \brief Do lookup in the ARP cache against an IP address
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* \param destination The destination IPv4 address to lookup the MAC address
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* of
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* \return An ArpCache::Entry with info about layer 2
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*/
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ArpCache::Entry *Lookup (Ipv4Address destination);
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/**
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* \brief Add an Ipv4Address to this ARP cache
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*/
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ArpCache::Entry *Add (Ipv4Address to);
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/**
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* \brief Clear the ArpCache of all entries
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*/
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void Flush (void);
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/**
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* \brief A record that that holds information about an ArpCache entry
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*/
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class Entry {
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public:
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/**
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* \brief Constructor
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* \param arp The ArpCache this entry belongs to
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*/
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Entry (ArpCache *arp);
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/**
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* \brief Changes the state of this entry to dead
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*/
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void MarkDead (void);
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/**
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* \param macAddress
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*/
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void MarkAlive (Address macAddress);
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/**
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* \param waiting
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*/
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void MarkWaitReply (Ptr<Packet> waiting);
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/**
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* \param waiting
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* \return
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*/
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bool UpdateWaitReply (Ptr<Packet> waiting);
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/**
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* \return True if the state of this entry is dead; false otherwise.
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*/
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bool IsDead (void);
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/**
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* \return True if the state of this entry is alive; false otherwise.
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*/
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bool IsAlive (void);
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/**
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* \return True if the state of this entry is wait_reply; false otherwise.
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*/
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bool IsWaitReply (void);
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/**
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* \return The MacAddress of this entry
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*/
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Address GetMacAddress (void) const;
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/**
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* \return The Ipv4Address for this entry
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*/
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Ipv4Address GetIpv4Address (void) const;
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/**
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* \param destination The Ipv4Address for this entry
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*/
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void SetIpv4Address (Ipv4Address destination);
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/**
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* \return True if this entry has timed out; false otherwise.
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*
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* This function returns true if the time elapsed strictly exceeds
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* the timeout value (i.e., is not less than or equal to the timeout).
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*/
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bool IsExpired (void) const;
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/**
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* \returns 0 is no packet is pending, the next packet to send if
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* packets are pending.
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*/
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Ptr<Packet> DequeuePending (void);
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/**
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* \returns number of retries that have been sent for an ArpRequest
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* in WaitReply state.
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*/
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uint32_t GetRetries (void) const;
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/**
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* \brief Increment the counter of number of retries for an entry
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*/
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void IncrementRetries (void);
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/**
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* \brief Zero the counter of number of retries for an entry
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*/
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void ClearRetries (void);
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private:
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enum ArpCacheEntryState_e {
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ALIVE,
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WAIT_REPLY,
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DEAD
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};
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void UpdateSeen (void);
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Time GetTimeout (void) const;
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ArpCache *m_arp;
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ArpCacheEntryState_e m_state;
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Time m_lastSeen;
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Address m_macAddress;
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Ipv4Address m_ipv4Address;
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std::list<Ptr<Packet> > m_pending;
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uint32_t m_retries;
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};
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private:
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typedef sgi::hash_map<Ipv4Address, ArpCache::Entry *, Ipv4AddressHash> Cache;
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typedef sgi::hash_map<Ipv4Address, ArpCache::Entry *, Ipv4AddressHash>::iterator CacheI;
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virtual void DoDispose (void);
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Ptr<NetDevice> m_device;
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Ptr<Ipv4Interface> m_interface;
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Time m_aliveTimeout;
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Time m_deadTimeout;
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Time m_waitReplyTimeout;
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EventId m_waitReplyTimer;
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Callback<void, Ptr<const ArpCache>, Ipv4Address> m_arpRequestCallback;
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uint32_t m_maxRetries;
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/**
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* This function is an event handler for the event that the
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* ArpCache wants to check whether it must retry any Arp requests.
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* If there are no Arp requests pending, this event is not scheduled.
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*/
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void HandleWaitReplyTimeout (void);
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uint32_t m_pendingQueueSize;
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Cache m_arpCache;
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TracedCallback<Ptr<const Packet> > m_dropTrace;
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};
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}; // namespace ns3
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#endif /* ARP_CACHE_H */
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