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

/*

 * Copyright (c) 2005,2006,2007 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

 *

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

 */

#include "ipv4-interface.h"

#include "ns3/ipv4-address.h"

#include "ns3/net-device.h"

#include "ns3/trace-resolver.h"

#include "ns3/log.h"

#include "ns3/packet.h"

NS_LOG_COMPONENT_DEFINE ("Ipv4Interface");

namespace ns3 {

  /**

   * By default, Ipv4 interface are created in the "down" state

   * with ip address 192.168.0.1 and a matching mask. Before

   * becoming useable, the user must invoke SetUp on them

   * once the final Ipv4 address and mask has been set.

   */

Ipv4Interface::Ipv4Interface (Ptr<NetDevice> nd) 

  : m_netdevice (nd), 

    m_ifup(false),

    m_metric(1)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << &nd << ")");

}

Ipv4Interface::~Ipv4Interface ()

{

  NS_LOG_FUNCTION;

}

void

Ipv4Interface::DoDispose (void)

{

  NS_LOG_FUNCTION;

  m_netdevice = 0;

  Object::DoDispose ();

}

Ptr<NetDevice>

Ipv4Interface::GetDevice (void) const

{

  NS_LOG_FUNCTION;

  return m_netdevice;

}

void 

Ipv4Interface::SetAddress (Ipv4Address a)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << a << ")");

  m_address = a;

}

void 

Ipv4Interface::SetNetworkMask (Ipv4Mask mask)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << mask << ")");

  m_netmask = mask;

}

Ipv4Address

Ipv4Interface::GetBroadcast (void) const

{

  NS_LOG_FUNCTION;

  uint32_t mask = m_netmask.GetHostOrder ();

  uint32_t address = m_address.GetHostOrder ();

  Ipv4Address broadcast = Ipv4Address (address | (~mask));

  return broadcast;

}

Ipv4Mask 

Ipv4Interface::GetNetworkMask (void) const

{

  NS_LOG_FUNCTION;

  return m_netmask;

}

void

Ipv4Interface::SetMetric (uint16_t metric)

{

  NS_LOG_FUNCTION;

  NS_LOG_PARAM ("(" << metric << ")");

  m_metric = metric;

}

uint16_t

Ipv4Interface::GetMetric (void) const

{

  NS_LOG_FUNCTION;

  return m_metric;

}

Ipv4Address 

Ipv4Interface::GetAddress (void) const

{

  NS_LOG_FUNCTION;

  return m_address;

}

uint16_t 

Ipv4Interface::GetMtu (void) const

{

  NS_LOG_FUNCTION;

  if (m_netdevice == 0)

    {

      uint32_t mtu = (1<<16) - 1;

      return mtu;

    }

  return m_netdevice->GetMtu ();

}

/**

 * These are IP interface states and may be distinct from 

 * NetDevice states, such as found in real implementations

 * (where the device may be down but IP interface state is still up).

 */

bool 

Ipv4Interface::IsUp (void) const

{

  NS_LOG_FUNCTION;

  return m_ifup;

}

bool 

Ipv4Interface::IsDown (void) const

{

  NS_LOG_FUNCTION;

  return !m_ifup;

}

void 

Ipv4Interface::SetUp (void)

{

  NS_LOG_FUNCTION;

  m_ifup = true;

}

void 

Ipv4Interface::SetDown (void)

{

  NS_LOG_FUNCTION;

  m_ifup = false;

}

// public wrapper on private virtual function

void 

Ipv4Interface::Send(Ptr<Packet> p, Ipv4Address dest)

{

  NS_LOG_FUNCTION;

  if (IsUp()) {

    NS_LOG_LOGIC ("SendTo");

    SendTo(p, dest);

  }

}

}; // namespace ns3