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

/*

 * Copyright (c) 2008-2009 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: David Gross <gdavid.devel@gmail.com>

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

 */

// Network topology

// //

// //             n0   r    n1

// //             |    _    |

// //             ====|_|====

// //                router

// //

// // - Tracing of queues and packet receptions to file "fragmentation-ipv6.tr"

#include <fstream>

#include "ns3/core-module.h"

#include "ns3/internet-module.h"

#include "ns3/csma-module.h"

#include "ns3/applications-module.h"

#include "ns3/ipv6-static-routing-helper.h"

#include "ns3/ipv6-routing-table-entry.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("FragmentationIpv6Example");

/**

 * \class StackHelper

 * \brief Helper to set or get some IPv6 information about nodes.

 */

class StackHelper

{

public:

  /**

   * \brief Add an address to a IPv6 node.

   * \param n node

   * \param interface interface index

   * \param address IPv6 address to add

   */

  inline void AddAddress (Ptr<Node>& n, uint32_t interface, Ipv6Address address)

  {

    Ptr<Ipv6> ipv6 = n->GetObject<Ipv6> ();

    ipv6->AddAddress (interface, address);

  }

  /**

   * \brief Print the routing table.

   * \param n the node

   */

  inline void PrintRoutingTable (Ptr<Node>& n)

  {

    Ptr<Ipv6StaticRouting> routing = 0;

    Ipv6StaticRoutingHelper routingHelper;

    Ptr<Ipv6> ipv6 = n->GetObject<Ipv6> ();

    uint32_t nbRoutes = 0;

    Ipv6RoutingTableEntry route;

    routing = routingHelper.GetStaticRouting (ipv6);

    std::cout << "Routing table of " << n << " : " << std::endl;

    std::cout << "Destination\t\t\t\t" << "Gateway\t\t\t\t\t" << "Interface\t" <<  "Prefix to use" << std::endl;

    nbRoutes = routing->GetNRoutes ();

    for (uint32_t i = 0; i < nbRoutes; i++)

      {

        route = routing->GetRoute (i);

        std::cout << route.GetDest () << "\t"

                  << route.GetGateway () << "\t"

                  << route.GetInterface () << "\t"

                  << route.GetPrefixToUse () << "\t"

                  << std::endl;

      }

  } 

};

int main (int argc, char** argv)

{

#if 0 

  LogComponentEnable ("Ipv6L3Protocol", LOG_LEVEL_ALL);

  LogComponentEnable ("Icmpv6L4Protocol", LOG_LEVEL_ALL);

  LogComponentEnable ("Ipv6StaticRouting", LOG_LEVEL_ALL);

  LogComponentEnable ("Ipv6Interface", LOG_LEVEL_ALL);

  LogComponentEnable ("Ping6Application", LOG_LEVEL_ALL);

#endif

  CommandLine cmd;

  cmd.Parse (argc, argv);

  StackHelper stackHelper;

  NS_LOG_INFO ("Create nodes.");

  Ptr<Node> n0 = CreateObject<Node> ();

  Ptr<Node> r = CreateObject<Node> ();

  Ptr<Node> n1 = CreateObject<Node> ();

  NodeContainer net1 (n0, r);

  NodeContainer net2 (r, n1);

  NodeContainer all (n0, r, n1);

  NS_LOG_INFO ("Create IPv6 Internet Stack");

  InternetStackHelper internetv6;

  internetv6.Install (all);

  NS_LOG_INFO ("Create channels.");

  CsmaHelper csma;

  csma.SetChannelAttribute ("DataRate", DataRateValue (5000000));

  csma.SetChannelAttribute ("Delay", TimeValue (MilliSeconds (2)));

  NetDeviceContainer d1 = csma.Install (net1);

  NetDeviceContainer d2 = csma.Install (net2);

  NS_LOG_INFO ("Create networks and assign IPv6 Addresses.");

  Ipv6AddressHelper ipv6;

  Ipv6InterfaceContainer i1 = ipv6.Assign (d1);

  i1.SetRouter (1, true);

  Ipv6InterfaceContainer i2 = ipv6.Assign (d2);

  i2.SetRouter (0, true);

  stackHelper.PrintRoutingTable (n0);

  /* Create a Ping6 application to send ICMPv6 echo request from n0 to n1 via r */

  uint32_t packetSize = 4096;

  uint32_t maxPacketCount = 5;

  Time interPacketInterval = Seconds (1.0);

  Ping6Helper ping6;

  ping6.SetLocal (i1.GetAddress (0, 1));

  ping6.SetRemote (i2.GetAddress (1, 1)); 

  ping6.SetAttribute ("MaxPackets", UintegerValue (maxPacketCount));

  ping6.SetAttribute ("Interval", TimeValue (interPacketInterval));

  ping6.SetAttribute ("PacketSize", UintegerValue (packetSize));

  ApplicationContainer apps = ping6.Install (net1.Get (0));

  apps.Start (Seconds (2.0));

  apps.Stop (Seconds (20.0));

  AsciiTraceHelper ascii;

  csma.EnableAsciiAll (ascii.CreateFileStream ("fragmentation-ipv6.tr"));

  csma.EnablePcapAll (std::string ("fragmentation-ipv6"), true);

  NS_LOG_INFO ("Run Simulation.");

  Simulator::Run ();

  Simulator::Destroy ();

  NS_LOG_INFO ("Done.");

}