--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/internet-stack/arp-cache.cc Mon Jun 09 15:40:22 2008 -0700
@@ -0,0 +1,287 @@
+/* -*- 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>
+ */
+#include "ns3/assert.h"
+#include "ns3/packet.h"
+#include "ns3/simulator.h"
+#include "ns3/uinteger.h"
+#include "ns3/log.h"
+
+#include "arp-cache.h"
+#include "arp-header.h"
+#include "ipv4-interface.h"
+
+NS_LOG_COMPONENT_DEFINE ("ArpCache");
+
+namespace ns3 {
+
+TypeId
+ArpCache::GetTypeId (void)
+{
+ static TypeId tid = TypeId ("ns3::ArpCache")
+ .SetParent<Object> ()
+ .AddAttribute ("AliveTimeout",
+ "When this timeout expires, the matching cache entry needs refreshing",
+ TimeValue (Seconds (120)),
+ MakeTimeAccessor (&ArpCache::m_aliveTimeout),
+ MakeTimeChecker ())
+ .AddAttribute ("DeadTimeout",
+ "When this timeout expires, a new attempt to resolve the matching entry is made",
+ TimeValue (Seconds (100)),
+ MakeTimeAccessor (&ArpCache::m_deadTimeout),
+ MakeTimeChecker ())
+ .AddAttribute ("WaitReplyTimeout",
+ "When this timeout expires, the matching cache entry is marked dead",
+ TimeValue (Seconds (1)),
+ MakeTimeAccessor (&ArpCache::m_waitReplyTimeout),
+ MakeTimeChecker ())
+ .AddAttribute ("PendingQueueSize",
+ "The size of the queue for packets pending an arp reply.",
+ UintegerValue (3),
+ MakeUintegerAccessor (&ArpCache::m_pendingQueueSize),
+ MakeUintegerChecker<uint32_t> ())
+ ;
+ return tid;
+}
+
+ArpCache::ArpCache ()
+ : m_device (0),
+ m_interface (0)
+{
+ NS_LOG_FUNCTION (this);
+}
+
+ArpCache::~ArpCache ()
+{
+ NS_LOG_FUNCTION (this);
+}
+
+void
+ArpCache::DoDispose (void)
+{
+ NS_LOG_FUNCTION (this);
+ Flush ();
+ m_device = 0;
+ m_interface = 0;
+ Object::DoDispose ();
+}
+
+void
+ArpCache::SetDevice (Ptr<NetDevice> device, Ptr<Ipv4Interface> interface)
+{
+ m_device = device;
+ m_interface = interface;
+}
+
+Ptr<NetDevice>
+ArpCache::GetDevice (void) const
+{
+ return m_device;
+}
+
+Ptr<Ipv4Interface>
+ArpCache::GetInterface (void) const
+{
+ return m_interface;
+}
+
+void
+ArpCache::SetAliveTimeout (Time aliveTimeout)
+{
+ m_aliveTimeout = aliveTimeout;
+}
+void
+ArpCache::SetDeadTimeout (Time deadTimeout)
+{
+ m_deadTimeout = deadTimeout;
+}
+void
+ArpCache::SetWaitReplyTimeout (Time waitReplyTimeout)
+{
+ m_waitReplyTimeout = waitReplyTimeout;
+}
+
+Time
+ArpCache::GetAliveTimeout (void) const
+{
+ return m_aliveTimeout;
+}
+Time
+ArpCache::GetDeadTimeout (void) const
+{
+ return m_deadTimeout;
+}
+Time
+ArpCache::GetWaitReplyTimeout (void) const
+{
+ return m_waitReplyTimeout;
+}
+
+void
+ArpCache::Flush (void)
+{
+ for (CacheI i = m_arpCache.begin (); i != m_arpCache.end (); i++)
+ {
+ delete (*i).second;
+ }
+ m_arpCache.erase (m_arpCache.begin (), m_arpCache.end ());
+}
+
+ArpCache::Entry *
+ArpCache::Lookup (Ipv4Address to)
+{
+ if (m_arpCache.find (to) != m_arpCache.end ())
+ {
+ ArpCache::Entry *entry = m_arpCache[to];
+ return entry;
+ }
+ return 0;
+}
+
+ArpCache::Entry *
+ArpCache::Add (Ipv4Address to)
+{
+ NS_ASSERT (m_arpCache.find (to) == m_arpCache.end ());
+
+ ArpCache::Entry *entry = new ArpCache::Entry (this);
+ m_arpCache[to] = entry;
+ return entry;
+}
+
+ArpCache::Entry::Entry (ArpCache *arp)
+ : m_arp (arp),
+ m_state (ALIVE)
+{}
+
+
+bool
+ArpCache::Entry::IsDead (void)
+{
+ return (m_state == DEAD)?true:false;
+}
+bool
+ArpCache::Entry::IsAlive (void)
+{
+ return (m_state == ALIVE)?true:false;
+}
+bool
+ArpCache::Entry::IsWaitReply (void)
+{
+ return (m_state == WAIT_REPLY)?true:false;
+}
+
+
+void
+ArpCache::Entry::MarkDead (void)
+{
+ m_state = DEAD;
+ UpdateSeen ();
+}
+void
+ArpCache::Entry::MarkAlive (Address macAddress)
+{
+ NS_ASSERT (m_state == WAIT_REPLY);
+ m_macAddress = macAddress;
+ m_state = ALIVE;
+ UpdateSeen ();
+}
+
+bool
+ArpCache::Entry::UpdateWaitReply (Ptr<Packet> waiting)
+{
+ NS_ASSERT (m_state == WAIT_REPLY);
+ /* We are already waiting for an answer so
+ * we dump the previously waiting packet and
+ * replace it with this one.
+ */
+ if (m_pending.size () >= m_arp->m_pendingQueueSize)
+ {
+ return false;
+ }
+ m_pending.push_back (waiting);
+ return true;
+}
+void
+ArpCache::Entry::MarkWaitReply (Ptr<Packet> waiting)
+{
+ NS_ASSERT (m_state == ALIVE || m_state == DEAD);
+ NS_ASSERT (m_pending.empty ());
+ m_state = WAIT_REPLY;
+ m_pending.push_back (waiting);
+ UpdateSeen ();
+}
+
+Address
+ArpCache::Entry::GetMacAddress (void)
+{
+ NS_ASSERT (m_state == ALIVE);
+ return m_macAddress;
+}
+bool
+ArpCache::Entry::IsExpired (void)
+{
+ Time timeout;
+ switch (m_state) {
+ case ArpCache::Entry::WAIT_REPLY:
+ timeout = m_arp->GetWaitReplyTimeout ();
+ break;
+ case ArpCache::Entry::DEAD:
+ timeout = m_arp->GetDeadTimeout ();
+ break;
+ case ArpCache::Entry::ALIVE:
+ timeout = m_arp->GetAliveTimeout ();
+ break;
+ default:
+ NS_ASSERT (false);
+ timeout = Seconds (0);
+ /* NOTREACHED */
+ break;
+ }
+ Time delta = Simulator::Now () - m_lastSeen;
+ if (delta >= timeout)
+ {
+ return true;
+ }
+ else
+ {
+ return false;
+ }
+}
+Ptr<Packet>
+ArpCache::Entry::DequeuePending (void)
+{
+ if (m_pending.empty ())
+ {
+ return 0;
+ }
+ else
+ {
+ Ptr<Packet> p = m_pending.front ();
+ m_pending.pop_front ();
+ return p;
+ }
+}
+void
+ArpCache::Entry::UpdateSeen (void)
+{
+ m_lastSeen = Simulator::Now ();
+}
+
+} // namespace ns3
+