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

/*

 * Copyright (c) 2005 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 "ns3/assert.h"

#include "ns3/packet.h"

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

#include "udp.h"

#include "udp-header.h"

#include "ipv4-end-point-demux.h"

#include "udp-end-point.h"

#include "node.h"

#include "ipv4.h"

#include "l3-demux.h"

namespace ns3 {

/* see http://www.iana.org/assignments/protocol-numbers */

const uint8_t Udp::PROT_NUMBER = 17;

Udp::Udp (Node *node)

  : Ipv4L4Protocol (PROT_NUMBER, 2),

    m_node (node),

    m_endPoints (new Ipv4EndPointDemux<UdpEndPoint> ())

{}

Udp::~Udp ()

{

  delete m_endPoints;

}

TraceResolver *

Udp::CreateTraceResolver (TraceContext const &context)

{

  return new EmptyTraceResolver (context);

}

UdpEndPoint *

Udp::Allocate (void)

{

  return m_endPoints->Allocate ();

}

UdpEndPoint *

Udp::Allocate (Ipv4Address address)

{

  return m_endPoints->Allocate (address);

}

UdpEndPoint *

Udp::Allocate (uint16_t port)

{

  return m_endPoints->Allocate (port);

}

UdpEndPoint *

Udp::Allocate (Ipv4Address address, uint16_t port)

{

  return m_endPoints->Allocate (address, port);

}

UdpEndPoint *

Udp::Allocate (Ipv4Address localAddress, uint16_t localPort,

               Ipv4Address peerAddress, uint16_t peerPort)

{

  return m_endPoints->Allocate (localAddress, localPort,

                                peerAddress, peerPort);

}

Udp* 

Udp::Copy(Node *node) const

{

  return new Udp (node);

}

void 

Udp::Receive(Packet& packet, 

             Ipv4Address const &source,

             Ipv4Address const &destination)

{

  UdpHeader udpHeader;

  packet.Peek (udpHeader);

  packet.Remove (udpHeader);

  UdpEndPoint *endPoint = m_endPoints->Lookup (destination, udpHeader.GetDestination (),

                                               source, udpHeader.GetSource ());

  if (endPoint == 0)

    {

      return;

    }

  socket->ForwardUp (packet, source, udpHeader.GetSource ());

  NS_ASSERT (socket != 0);

}

void

Udp::Send (Packet packet, 

           Ipv4Address saddr, Ipv4Address daddr, 

           uint16_t sport, uint16_t dport)

{

  UdpHeader udpHeader;

  udpHeader.SetDestination (dport);

  udpHeader.SetSource (sport);

  udpHeader.SetPayloadSize (packet.GetSize ());

  udpHeader.InitializeChecksum (saddr,

                               daddr,

                               PROT_NUMBER);

  packet.Add (udpHeader);

  Ipv4 *ipv4 = m_node->GetIpv4 ();

  if (ipv4 != 0)

    {

      ipv4->Send (packet, saddr, daddr, PROT_NUMBER);

    }

}

}; // namespace ns3