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

//

// Copyright (c) 2006 Georgia Tech Research Corporation

// 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: George F. Riley<riley@ece.gatech.edu>

//         Gustavo Carneiro <gjc@inescporto.pt>

#include "ipv4-static-routing.h"

#include "ns3/packet.h"

namespace ns3 {

void 

Ipv4StaticRouting::AddHostRouteTo (Ipv4Address dest, 

                                   Ipv4Address nextHop, 

                                   uint32_t interface)

{

  Ipv4Route *route = new Ipv4Route ();

  *route = Ipv4Route::CreateHostRouteTo (dest, nextHop, interface);

  m_hostRoutes.push_back (route);

}

void 

Ipv4StaticRouting::AddHostRouteTo (Ipv4Address dest, 

                                   uint32_t interface)

{

  Ipv4Route *route = new Ipv4Route ();

  *route = Ipv4Route::CreateHostRouteTo (dest, interface);

  m_hostRoutes.push_back (route);

}

void 

Ipv4StaticRouting::AddNetworkRouteTo (Ipv4Address network, 

                                      Ipv4Mask networkMask, 

                                      Ipv4Address nextHop, 

                                      uint32_t interface)

{

  Ipv4Route *route = new Ipv4Route ();

  *route = Ipv4Route::CreateNetworkRouteTo (network,

                                            networkMask,

                                            nextHop,

                                            interface);

  m_networkRoutes.push_back (route);

}

void 

Ipv4StaticRouting::AddNetworkRouteTo (Ipv4Address network, 

                                      Ipv4Mask networkMask, 

                                      uint32_t interface)

{

  Ipv4Route *route = new Ipv4Route ();

  *route = Ipv4Route::CreateNetworkRouteTo (network,

                                            networkMask,

                                            interface);

  m_networkRoutes.push_back (route);

}

void 

Ipv4StaticRouting::SetDefaultRoute (Ipv4Address nextHop, 

                                    uint32_t interface)

{

  Ipv4Route *route = new Ipv4Route ();

  *route = Ipv4Route::CreateDefaultRoute (nextHop, interface);

  delete m_defaultRoute;

  m_defaultRoute = route;

}

Ipv4Route *

Ipv4StaticRouting::LookupStatic (Ipv4Address dest)

{

  for (HostRoutesCI i = m_hostRoutes.begin (); 

       i != m_hostRoutes.end (); 

       i++) 

    {

      NS_ASSERT ((*i)->IsHost ());

      if ((*i)->GetDest ().IsEqual (dest)) 

        {

          return (*i);

        }

    }

  for (NetworkRoutesI j = m_networkRoutes.begin (); 

       j != m_networkRoutes.end (); 

       j++) 

    {

      NS_ASSERT ((*j)->IsNetwork ());

      Ipv4Mask mask = (*j)->GetDestNetworkMask ();

      Ipv4Address entry = (*j)->GetDestNetwork ();

      if (mask.IsMatch (dest, entry)) 

        {

          return (*j);

        }

    }

  if (m_defaultRoute != 0) 

    {

      NS_ASSERT (m_defaultRoute->IsDefault ());

      return m_defaultRoute;

    }

  return 0;

}

uint32_t 

Ipv4StaticRouting::GetNRoutes (void)

{

  uint32_t n = 0;

  if (m_defaultRoute != 0)

    {

      n++;

    }

  n += m_hostRoutes.size ();

  n += m_networkRoutes.size ();

  return n;

}

Ipv4Route *

Ipv4StaticRouting::GetRoute (uint32_t index)

{

  if (index == 0 && m_defaultRoute != 0)

    {

      return m_defaultRoute;

    }

  if (index > 0 && m_defaultRoute != 0)

    {

      index--;

    }

  if (index < m_hostRoutes.size ())

    {

      uint32_t tmp = 0;

      for (HostRoutesCI i = m_hostRoutes.begin (); 

           i != m_hostRoutes.end (); 

           i++) 

        {

          if (tmp  == index)

            {

              return *i;

            }

          tmp++;

        }

    }

  index -= m_hostRoutes.size ();

  uint32_t tmp = 0;

  for (NetworkRoutesI j = m_networkRoutes.begin (); 

       j != m_networkRoutes.end (); 

       j++) 

    {

      if (tmp == index)

        {

          return *j;

        }

      tmp++;

    }

  NS_ASSERT (false);

  // quiet compiler.

  return 0;

}

void 

Ipv4StaticRouting::RemoveRoute (uint32_t index)

{

  if (index == 0 && m_defaultRoute != 0)

    {

      delete m_defaultRoute;

      m_defaultRoute = 0;

    }

  if (index > 0 && m_defaultRoute != 0)

    {

      index--;

    }

  if (index < m_hostRoutes.size ())

    {

      uint32_t tmp = 0;

      for (HostRoutesI i = m_hostRoutes.begin (); 

           i != m_hostRoutes.end (); 

           i++) 

        {

          if (tmp  == index)

            {

              delete *i;

              m_hostRoutes.erase (i);

              return;

            }

          tmp++;

        }

    }

  index -= m_hostRoutes.size ();

  uint32_t tmp = 0;

  for (NetworkRoutesI j = m_networkRoutes.begin (); 

       j != m_networkRoutes.end (); 

       j++) 

    {

      if (tmp == index)

        {

          delete *j;

          m_networkRoutes.erase (j);

          return;

        }

      tmp++;

    }

  NS_ASSERT (false);

}

bool

Ipv4StaticRouting::RequestRoute (Ipv4Header const &ipHeader,

                                 Packet packet,

                                 RouteReplyCallback routeReply)

{

  Ipv4Route *route = LookupStatic (ipHeader.GetDestination ());

  if (route != 0)

    {

      routeReply (true, *route, packet, ipHeader);

      return true;

    }

  else

    {

      return false; // Let other routing protocols try to handle this

                    // route request.

    }

}

void

Ipv4StaticRouting::DoDispose (void)

{

  for (HostRoutesI i = m_hostRoutes.begin (); 

       i != m_hostRoutes.end (); 

       i = m_hostRoutes.erase (i)) 

    {

      delete (*i);

    }

  for (NetworkRoutesI j = m_networkRoutes.begin (); 

       j != m_networkRoutes.end (); 

       j = m_networkRoutes.erase (j)) 

    {

      delete (*j);

    }

  if (m_defaultRoute != 0)

    {

      delete m_defaultRoute;

      m_defaultRoute = 0;

    }

  Ipv4RoutingProtocol::DoDispose ();

}

}//namespace ns3