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

/*

 * Copyright (c) 2007-2009 Strasbourg University

 *

 * 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: Sebastien Vincent <vincent@clarinet.u-strasbg.fr>

 */

#include "ns3/log.h"

#include "ns3/node.h"

#include "ns3/packet.h"

#include "ipv6-interface.h"

#include "ns3/net-device.h"

#include "loopback-net-device.h"

#include "ipv6-l3-protocol.h"

#include "icmpv6-l4-protocol.h"

#include "ndisc-cache.h"

namespace ns3

{

NS_LOG_COMPONENT_DEFINE ("Ipv6Interface");

TypeId Ipv6Interface::GetTypeId ()

{

  static TypeId tid = TypeId ("ns3::Ipv6Interface")

    .SetParent<Object> ()

  ;

  return tid;

}

Ipv6Interface::Ipv6Interface ()

  : m_ifup (false),

    m_forwarding (true),

    m_metric (1),

    m_node (0),

    m_device (0),

    m_curHopLimit (0),

    m_baseReachableTime (0),

    m_reachableTime (0),

    m_retransTimer (0)

{

  NS_LOG_FUNCTION (this);

}

Ipv6Interface::~Ipv6Interface ()

{

  NS_LOG_FUNCTION_NOARGS ();

}

void Ipv6Interface::DoDispose ()

{

  NS_LOG_FUNCTION_NOARGS ();

  Object::DoDispose ();

}

void Ipv6Interface::DoSetup ()

{

  NS_LOG_FUNCTION_NOARGS ();

  if (m_node == 0 || m_device == 0)

    {

      return;

    }

  /* set up link-local address */

  if (!DynamicCast<LoopbackNetDevice> (m_device)) /* no autoconf for ip6-localhost */

    {

      Address addr = GetDevice ()->GetAddress ();

      if (Mac48Address::IsMatchingType (addr))

        {

          Ipv6InterfaceAddress ifaddr = Ipv6InterfaceAddress (Ipv6Address::MakeAutoconfiguredLinkLocalAddress (Mac48Address::ConvertFrom (addr)), Ipv6Prefix (64));

          AddAddress (ifaddr);

        }

      else

        {

          NS_ASSERT_MSG (false, "IPv6 autoconf for this kind of address not implemented.");

        }

    }

  else

    {

      return; /* no NDISC cache for ip6-localhost */

    }

  Ptr<Icmpv6L4Protocol> icmpv6 = m_node->GetObject<Ipv6L3Protocol> ()->GetIcmpv6 ();

  m_ndCache = icmpv6->CreateCache (m_device, this);

}

void Ipv6Interface::SetNode (Ptr<Node> node)

{

  NS_LOG_FUNCTION (this << node);

  m_node = node;

  DoSetup ();

}

void Ipv6Interface::SetDevice (Ptr<NetDevice> device)

{

  NS_LOG_FUNCTION (this << device);

  m_device = device;

  DoSetup ();

}

Ptr<NetDevice> Ipv6Interface::GetDevice () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_device;

}

void Ipv6Interface::SetMetric (uint16_t metric)

{

  NS_LOG_FUNCTION (this << metric);

  m_metric = metric;

}

uint16_t Ipv6Interface::GetMetric () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_metric;

}

bool Ipv6Interface::IsUp () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_ifup;

}

bool Ipv6Interface::IsDown () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return !m_ifup;

}

void Ipv6Interface::SetUp ()

{

  NS_LOG_FUNCTION_NOARGS ();

  if (m_ifup)

    {

      return;

    }

  m_ifup = true;

}

void Ipv6Interface::SetDown ()

{

  NS_LOG_FUNCTION_NOARGS ();

  m_ifup = false;

  m_addresses.clear ();

}

bool Ipv6Interface::IsForwarding () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_forwarding;

}

void Ipv6Interface::SetForwarding (bool forwarding)

{

  NS_LOG_FUNCTION (this << forwarding);

  m_forwarding = forwarding;

}

bool Ipv6Interface::AddAddress (Ipv6InterfaceAddress iface)

{

  NS_LOG_FUNCTION_NOARGS ();

  Ipv6Address addr = iface.GetAddress ();

  /* DAD handling */

  if (!addr.IsAny ())

    {

      for (Ipv6InterfaceAddressListCI it = m_addresses.begin (); it != m_addresses.end (); ++it)

        {

          if ((*it).GetAddress () == addr)

            {

              return false;

            }

        }

      m_addresses.push_back (iface);

      if (!addr.IsAny () || !addr.IsLocalhost ())

        {

          /* DAD handling */

          Ptr<Icmpv6L4Protocol> icmpv6 = m_node->GetObject<Ipv6L3Protocol> ()->GetIcmpv6 ();

          if (icmpv6 && icmpv6->IsAlwaysDad ())

            {

              Simulator::Schedule (Seconds (0.), &Icmpv6L4Protocol::DoDAD, icmpv6, addr, this);

              Simulator::Schedule (Seconds (1.), &Icmpv6L4Protocol::FunctionDadTimeout, icmpv6, this, addr);

            }

        }

      return true;

    }

  /* bad address */

  return false;

}

Ipv6InterfaceAddress Ipv6Interface::GetLinkLocalAddress () const

{

  /* IPv6 interface has always at least one IPv6 link-local address */

  NS_LOG_FUNCTION_NOARGS ();

  for (Ipv6InterfaceAddressListCI it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      if ((*it).GetAddress ().IsLinkLocal ())

        {

          return (*it);

        }

    }

  NS_ASSERT_MSG (false, "No link-local address on interface " << this);

  Ipv6InterfaceAddress addr;

  return addr; /* quiet compiler */

}

Ipv6InterfaceAddress Ipv6Interface::GetAddress (uint32_t index) const

{

  NS_LOG_FUNCTION (this << index);

  uint32_t i = 0;

  if (m_addresses.size () > index)

    {

      for (Ipv6InterfaceAddressListCI it = m_addresses.begin (); it != m_addresses.end (); ++it)

        {

          if (i == index)

            {

              return (*it);

            }

          i++;

        }

    }

  NS_ASSERT_MSG (false, "Address " << index << " not found");

  Ipv6InterfaceAddress addr;

  return addr;  /* quiet compiler */

}

uint32_t Ipv6Interface::GetNAddresses () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_addresses.size ();

}

Ipv6InterfaceAddress Ipv6Interface::RemoveAddress (uint32_t index)

{

  NS_LOG_FUNCTION (this << index);

  uint32_t i = 0;

  if (m_addresses.size () < index)

    {

      NS_ASSERT_MSG (false, "Try to remove index that don't exist in Ipv6Interface::RemoveAddress");

    }

  for (Ipv6InterfaceAddressListI it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      if (i == index)

        {

          Ipv6InterfaceAddress iface = (*it);

          m_addresses.erase (it);

          return iface;

        }

      i++;

    }

  NS_ASSERT_MSG (false, "Address " << index << " not found");

  Ipv6InterfaceAddress addr;

  return addr;  /* quiet compiler */

}

Ipv6InterfaceAddress Ipv6Interface::GetAddressMatchingDestination (Ipv6Address dst)

{

  NS_LOG_FUNCTION (this << dst);

  for (Ipv6InterfaceAddressList::const_iterator it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      Ipv6InterfaceAddress ifaddr = (*it);

      if (ifaddr.GetPrefix ().IsMatch (ifaddr.GetAddress (), dst))

        {

          return ifaddr;

        }

    }

  /*  NS_ASSERT_MSG (false, "Not matching address."); */

  Ipv6InterfaceAddress ret;

  return ret; /* quiet compiler */

}

void Ipv6Interface::Send (Ptr<Packet> p, Ipv6Address dest)

{

  NS_LOG_FUNCTION (this << p << dest);

  Ptr<Ipv6L3Protocol> ipv6 = m_node->GetObject<Ipv6L3Protocol> ();

  if (!IsUp ())

    {

      return;

    }

  /* check if destination is localhost (::1) */

  if (DynamicCast<LoopbackNetDevice> (m_device))

    {

      /* XXX additional checks needed here (such as whether multicast

       * goes to loopback)?

       */

      m_device->Send (p, m_device->GetBroadcast (), Ipv6L3Protocol::PROT_NUMBER);

      return;

    }

  /* check if destination is for one of our interface */

  for (Ipv6InterfaceAddressListCI it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      if (dest == (*it).GetAddress ())

        {

          ipv6->Receive (m_device, p, Ipv6L3Protocol::PROT_NUMBER,

                         m_device->GetBroadcast (),

                         m_device->GetBroadcast (),

                         NetDevice::PACKET_HOST // note: linux uses PACKET_LOOPBACK here

                         );

          return;

        }

    }

  /* other address */

  if (m_device->NeedsArp ())

    {

      NS_LOG_LOGIC ("Needs ARP" << " " << dest);

      Ptr<Icmpv6L4Protocol> icmpv6 = ipv6->GetIcmpv6 ();

      Address hardwareDestination;

      bool found = false;

      NS_ASSERT (icmpv6);

      if (dest.IsMulticast ())

        {

          NS_LOG_LOGIC ("IsMulticast");

          NS_ASSERT_MSG (m_device->IsMulticast (), "Ipv6Interface::SendTo (): Sending multicast packet over non-multicast device");

          hardwareDestination = m_device->GetMulticast (dest);

          found = true;

        }

      else

        {

          NS_LOG_LOGIC ("NDISC Lookup");

          found = icmpv6->Lookup (p, dest, GetDevice (), m_ndCache, &hardwareDestination);

        }

      if (found)

        {

          NS_LOG_LOGIC ("Address Resolved.  Send.");

          m_device->Send (p, hardwareDestination, Ipv6L3Protocol::PROT_NUMBER);

        }

    }

  else

    {

      NS_LOG_LOGIC ("Doesn't need ARP");

      m_device->Send (p, m_device->GetBroadcast (), Ipv6L3Protocol::PROT_NUMBER);

    }

}

void Ipv6Interface::SetCurHopLimit (uint8_t curHopLimit)

{

  NS_LOG_FUNCTION (this << curHopLimit);

  m_curHopLimit = curHopLimit;

}

uint8_t Ipv6Interface::GetCurHopLimit () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_curHopLimit;

}

void Ipv6Interface::SetBaseReachableTime (uint16_t baseReachableTime)

{

  NS_LOG_FUNCTION (this << baseReachableTime);

  m_baseReachableTime = baseReachableTime;

}

uint16_t Ipv6Interface::GetBaseReachableTime () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_baseReachableTime;

}

void Ipv6Interface::SetReachableTime (uint16_t reachableTime)

{

  NS_LOG_FUNCTION (this << reachableTime);

  m_reachableTime = reachableTime;

}

uint16_t Ipv6Interface::GetReachableTime () const

{

  NS_LOG_FUNCTION_NOARGS (); 

  return m_reachableTime;

}

void Ipv6Interface::SetRetransTimer (uint16_t retransTimer)

{

  NS_LOG_FUNCTION (this << retransTimer); 

  m_retransTimer = retransTimer;

}

uint16_t Ipv6Interface::GetRetransTimer () const

{

  NS_LOG_FUNCTION_NOARGS (); 

  return m_retransTimer;

}

void Ipv6Interface::SetState (Ipv6Address address, Ipv6InterfaceAddress::State_e state)

{

  NS_LOG_FUNCTION (this << address << state);

  for (Ipv6InterfaceAddressListI it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      if ((*it).GetAddress () == address)

        {

          (*it).SetState (state);

          return;

        }

    }

  /* not found, maybe address has expired */

}

void Ipv6Interface::SetNsDadUid (Ipv6Address address, uint32_t uid)

{

  NS_LOG_FUNCTION (this << address << uid);

  for (Ipv6InterfaceAddressListI it = m_addresses.begin (); it != m_addresses.end (); ++it)

    {

      if ((*it).GetAddress () == address)

        {

          (*it).SetNsDadUid (uid);

          return;

        }

    }

  /* not found, maybe address has expired */

}

} /* namespace ns3 */