--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/internet-node/arp-cache.cc	Fri May 04 15:04:07 2007 +0200
@@ -0,0 +1,229 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2006 INRIA
+ * All rights reserved.
+ *
+ * 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 "arp-cache.h"
+#include "arp-header.h"
+
+namespace ns3 {
+
+ArpCache::ArpCache (NetDevice *device, Ipv4Interface *interface)
+  : m_device (device), 
+    m_interface (interface),
+    m_aliveTimeout (Seconds (120)),
+    m_deadTimeout (Seconds (100)),
+    m_waitReplyTimeout (Seconds (1))
+{
+  m_device->Ref ();
+}
+
+ArpCache::~ArpCache ()
+{
+  m_device->Unref ();
+  Flush ();
+}
+
+NetDevice *
+ArpCache::PeekDevice (void) const
+{
+  return m_device;
+}
+
+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)
+{
+  ArpCache::Entry *entry = new ArpCache::Entry (this);
+  m_arpCache[to] = entry;  
+  return entry;
+}
+
+ArpCache::Entry::Entry (ArpCache *arp)
+  : m_arp (arp),
+    m_state (ALIVE),
+    m_waiting ()
+{}
+
+
+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;
+  //NS_ASSERT (m_waiting != 0);
+  UpdateSeen ();
+}
+Packet 
+ArpCache::Entry::MarkAlive (MacAddress macAddress) 
+{
+  NS_ASSERT (m_state == WAIT_REPLY);
+  //NS_ASSERT (m_waiting != 0);
+  m_macAddress = macAddress;
+  m_state = ALIVE;
+  UpdateSeen ();
+  Packet waiting = m_waiting;
+  //m_waiting = 0;
+  return waiting;
+}
+
+Packet 
+ArpCache::Entry::UpdateWaitReply (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.
+   */
+  Packet old = m_waiting;
+  m_waiting = waiting;
+  return old;
+}
+void 
+ArpCache::Entry::MarkWaitReply (Packet waiting)
+{
+  NS_ASSERT (m_state == ALIVE || m_state == DEAD);
+  //NS_ASSERT (m_waiting == 0);
+  m_state = WAIT_REPLY;
+  m_waiting = waiting;
+  UpdateSeen ();
+}
+
+MacAddress
+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;
+    }
+}
+void 
+ArpCache::Entry::UpdateSeen (void)
+{
+  m_lastSeen = Simulator::Now ();
+}
+
+} // namespace ns3
+