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

/*

 * Copyright (c) 2007 Emmanuelle Laprise

 *

 * 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: Emmanuelle Laprise <emmanuelle.laprise@bluekazoo.ca>

 */

#include "ns3/log.h"

#include "ns3/queue.h"

#include "ns3/simulator.h"

#include "ns3/ethernet-header.h"

#include "ns3/ethernet-trailer.h"

#include "ns3/llc-snap-header.h"

#include "ns3/error-model.h"

#include "ns3/enum.h"

#include "ns3/boolean.h"

#include "ns3/pointer.h"

#include "ns3/trace-source-accessor.h"

#include "csma-net-device.h"

#include "csma-channel.h"

NS_LOG_COMPONENT_DEFINE ("CsmaNetDevice");

namespace ns3 {

NS_OBJECT_ENSURE_REGISTERED (CsmaNetDevice);

TypeId 

CsmaNetDevice::GetTypeId (void)

{

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

    .SetParent<NetDevice> ()

    .AddConstructor<CsmaNetDevice> ()

                   Mac48AddressValue (Mac48Address ("ff:ff:ff:ff:ff:ff")),

                   MakeMac48AddressAccessor (&CsmaNetDevice::m_address),

                   MakeMac48AddressChecker ())

                   EnumValue (LLC),

                   MakeEnumAccessor (&CsmaNetDevice::m_encapMode),

                   MakeEnumChecker (ETHERNET_V1, "EthernetV1",

                                    IP_ARP, "IpArp",

                                    RAW, "Raw",

                                    LLC, "Llc"))

                   BooleanValue (true),

                   MakeBooleanAccessor (&CsmaNetDevice::m_sendEnable),

                   MakeBooleanChecker ())

                   BooleanValue (true),

                   MakeBooleanAccessor (&CsmaNetDevice::m_receiveEnable),

                   MakeBooleanChecker ())

                   PointerValue (),

                   MakePointerAccessor (&CsmaNetDevice::m_receiveErrorModel),

                   MakePointerChecker<ErrorModel> ())

                   PointerValue (),

                   MakePointerAccessor (&CsmaNetDevice::m_queue),

                   MakePointerChecker<Queue> ())

                     MakeTraceSourceAccessor (&CsmaNetDevice::m_rxTrace))

                     MakeTraceSourceAccessor (&CsmaNetDevice::m_dropTrace))

    ;

  return tid;

}

CsmaNetDevice::CsmaNetDevice ()

  : m_name (""),

    m_linkUp (false),

    m_mtu (0xffff)

{

  NS_LOG_FUNCTION (this);

  m_txMachineState = READY;

  m_channel = 0; 

}

CsmaNetDevice::~CsmaNetDevice()

{

  NS_LOG_FUNCTION_NOARGS ();

  m_queue = 0;

}

CsmaNetDevice::DoDispose ()

{

  NS_LOG_FUNCTION_NOARGS ();

  m_channel = 0;

  m_node = 0;

  NetDevice::DoDispose ();

}

CsmaNetDevice::SetAddress (Mac48Address self)

{

  m_address = self;

}

CsmaNetDevice::SetSendEnable (bool sendEnable)

{

  NS_LOG_FUNCTION_NOARGS ();

  m_sendEnable = sendEnable;

}

CsmaNetDevice::SetReceiveEnable (bool receiveEnable)

{

  NS_LOG_FUNCTION_NOARGS ();

  m_receiveEnable = receiveEnable;

}

CsmaNetDevice::IsSendEnabled (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return (m_sendEnable);

}

CsmaNetDevice::IsReceiveEnabled (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return (m_receiveEnable);

}

CsmaNetDevice::SetInterframeGap (Time t)

{

  NS_LOG_FUNCTION_NOARGS ();

  m_tInterframeGap = t;

}

{

  NS_LOG_FUNCTION_NOARGS ();

  m_backoff.m_slotTime = slotTime;

  m_backoff.m_minSlots = minSlots;

  m_backoff.m_maxSlots = maxSlots;

  m_backoff.m_ceiling = ceiling;

  m_backoff.m_maxRetries = maxRetries;

}

{

  NS_LOG_FUNCTION_NOARGS ();

  if (m_encapMode == RAW)

    {

      return;

    }

  Mac48Address source = Mac48Address::ConvertFrom (GetAddress ());

  uint16_t lengthType = 0;

  switch (m_encapMode) 

    {

    case ETHERNET_V1:

      break;

    case IP_ARP:

      lengthType = protocolNumber;

      break;

    case LLC: {

      LlcSnapHeader llc;

      llc.SetType (protocolNumber);

      p->AddHeader (llc);

    } break;

    case RAW:

      NS_ASSERT (false);

      break;

    }

  header.SetLengthType (lengthType);

}

CsmaNetDevice::ProcessHeader (Ptr<Packet> p, uint16_t & param)

{

  NS_LOG_FUNCTION_NOARGS ();

  if (m_encapMode == RAW)

    {

      return true;

    }

  EthernetTrailer trailer;

    {

      return false;

    }

  switch (m_encapMode)

    {

    case ETHERNET_V1:

    case IP_ARP:

      break;

    case LLC: {

      LlcSnapHeader llc;

      p->RemoveHeader (llc);

      param = llc.GetType ();

    } break;

    case RAW:

      NS_ASSERT (false);

      break;

    }

  return true;

}

CsmaNetDevice::TransmitStart ()

{

  NS_LOG_FUNCTION_NOARGS ();

  NS_LOG_LOGIC ("m_currentPkt=" << m_currentPkt);

  NS_LOG_LOGIC ("UID is " << m_currentPkt->GetUid ());

//

// This function is called to start the process of transmitting a packet.

// We need to tell the channel that we've started wiggling the wire and

// schedule an event that will be executed when it's time to tell the 

// channel that we're done wiggling the wire.

//

        } 

      else 

        {

          NS_LOG_LOGIC ("Channel busy, backing off for " << 

            backoffTime.GetSeconds () << " sec");

        }

    } 

  else 

    {

      m_txMachineState = BUSY;

      NS_LOG_LOGIC ("Schedule TransmitCompleteEvent in " << 

        tEvent.GetSeconds () << "sec");

        {

          NS_LOG_WARN ("Channel transmit start did not work at " << 

            tEvent.GetSeconds () << "sec");

          m_txMachineState = READY;

        } 

      else 

        {

        }

    }

}

CsmaNetDevice::TransmitAbort (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  NS_LOG_LOGIC ("Pkt UID is " << m_currentPkt->GetUid () << ")");

  m_currentPkt = m_queue->Dequeue ();

  m_txMachineState = READY;

  TransmitStart ();

}

CsmaNetDevice::TransmitCompleteEvent (void)

{

  NS_LOG_FUNCTION_NOARGS ();

//

// This function is called to finish the  process of transmitting a packet.

// We need to tell the channel that we've stopped wiggling the wire and

// schedule an event that will be executed when it's time to re-enable

// the transmitter after the interframe gap.

//

  m_txMachineState = GAP;

  NS_LOG_LOGIC ("Pkt UID is " << m_currentPkt->GetUid () << ")");

  m_channel->TransmitEnd (); 

  NS_LOG_LOGIC ("Schedule TransmitReadyEvent in "

    << m_tInterframeGap.GetSeconds () << "sec");

}

CsmaNetDevice::TransmitReadyEvent (void)

{

  NS_LOG_FUNCTION_NOARGS ();

//

// This function is called to enable the transmitter after the interframe

// gap has passed.  If there are pending transmissions, we use this opportunity

// to start the next transmit.

//

  m_txMachineState = READY;

  // Get the next packet from the queue for transmitting

    {

      return;

    }

  else

    {

      m_currentPkt = m_queue->Dequeue ();

      TransmitStart ();

    }

}

bool

CsmaNetDevice::Attach (Ptr<CsmaChannel> ch)

{

  NS_LOG_FUNCTION (this << &ch);

  m_channel = ch;

  m_bps = m_channel->GetDataRate ();

  NotifyLinkUp ();

  return true;

}

CsmaNetDevice::SetQueue (Ptr<Queue> q)

{

  NS_LOG_FUNCTION (this << q);

  m_queue = q;

}

{

  NS_LOG_FUNCTION (em);

  m_receiveErrorModel = em; 

}

CsmaNetDevice::Receive (Ptr<Packet> packet)

{

  NS_LOG_FUNCTION_NOARGS ();

    {

      m_dropTrace (packet);

      return;

    }

  m_rxTrace (packet);

  if (m_encapMode == RAW)

    {

      m_rxCallback (this, packet, 0, GetBroadcast ());

      return;

    }