/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2007 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

 *

 * Authors: 

 *  Mathieu Lacage <mathieu.lacage@sophia.inria.fr>,

 */

#include "ns3/packet.h"

#include "ns3/log.h"

#include "ns3/composite-trace-resolver.h"

#include "ns3/node.h"

#include "ns3/net-device.h"

#include "ns3/address.h"

#include "arp-ipv4-interface.h"

#include "ipv4-l3-protocol.h"

#include "arp-l3-protocol.h"

NS_LOG_COMPONENT_DEFINE ("ArpIpv4Interface");

namespace ns3 {

ArpIpv4Interface::ArpIpv4Interface (Ptr<Node> node, Ptr<NetDevice> device)

  : Ipv4Interface (device),

    m_node (node)

{

  NS_LOG_FUNCTION;

}

ArpIpv4Interface::~ArpIpv4Interface ()

{

  NS_LOG_FUNCTION;

}

Ptr<TraceResolver>

ArpIpv4Interface::GetTraceResolver (void) const

{

  NS_LOG_FUNCTION;

  Ptr<CompositeTraceResolver> resolver = Create<CompositeTraceResolver> ();

  if (GetDevice () != 0)

    {

      resolver->AddComposite ("netdevice", GetDevice ());

    }

  resolver->SetParentResolver (Ipv4Interface::GetTraceResolver ());

  return resolver;

}

void 

ArpIpv4Interface::SendTo (Packet p, Ipv4Address dest)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << &p << ", " << dest << ")");

  NS_ASSERT (GetDevice () != 0);

  if (GetDevice ()->NeedsArp ())

    {

      NS_LOG_LOGIC ("Needs ARP");

      Ptr<ArpL3Protocol> arp = 

        m_node->QueryInterface<ArpL3Protocol> (ArpL3Protocol::iid);

      Address hardwareDestination;

      bool found;

      if (dest.IsBroadcast () || 

          dest.IsSubnetDirectedBroadcast (GetNetworkMask ()) )

        {

          NS_LOG_LOGIC ("IsBroadcast");

          hardwareDestination = GetDevice ()->GetBroadcast ();

          found = true;

        }

      else if (dest.IsMulticast ())

        {

          NS_LOG_LOGIC ("IsMulticast");

          NS_ASSERT_MSG(GetDevice ()->IsMulticast (),

            "ArpIpv4Interface::SendTo (): Sending multicast packet over "

            "non-multicast device");

          hardwareDestination = GetDevice ()->MakeMulticastAddress(dest);

          found = true;

        }

      else

        {

          NS_LOG_LOGIC ("ARP Lookup");

          found = arp->Lookup (p, dest, GetDevice (), &hardwareDestination);

        }

      if (found)

        {

          NS_LOG_LOGIC ("Address Resolved.  Send.");

          GetDevice ()->Send (p, hardwareDestination, 

            Ipv4L3Protocol::PROT_NUMBER);

        }

    }

  else

    {

      NS_LOG_LOGIC ("Doesn't need ARP");

      GetDevice ()->Send (p, GetDevice ()->GetBroadcast (), 

        Ipv4L3Protocol::PROT_NUMBER);

    }

}

}//namespace ns3