/* -*- 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/uinteger.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> ()

    .AddAttribute ("Address", 

                   "The MAC address of this device.",

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

                   MakeMac48AddressAccessor (&CsmaNetDevice::m_address),

                   MakeMac48AddressChecker ())

    .AddAttribute ("FrameSize", 

                   "The maximum size of a packet sent over this device.",

                   UintegerValue (DEFAULT_FRAME_SIZE),

                   MakeUintegerAccessor (&CsmaNetDevice::SetFrameSize,

                                         &CsmaNetDevice::GetFrameSize),

                   MakeUintegerChecker<uint16_t> ())

    .AddAttribute ("EncapsulationMode", 

                   "The link-layer encapsulation type to use.",

                   EnumValue (DIX),

                   MakeEnumAccessor (&CsmaNetDevice::SetEncapsulationMode),

                   MakeEnumChecker (DIX, "Dix",

                                    LLC, "Llc"))

    .AddAttribute ("SendEnable", 

                   "Enable or disable the transmitter section of the device.",

                   BooleanValue (true),

                   MakeBooleanAccessor (&CsmaNetDevice::m_sendEnable),

                   MakeBooleanChecker ())

    .AddAttribute ("ReceiveEnable",

                   "Enable or disable the receiver section of the device.",

                   BooleanValue (true),

                   MakeBooleanAccessor (&CsmaNetDevice::m_receiveEnable),

                   MakeBooleanChecker ())

    .AddAttribute ("RxErrorModel", 

                   "The receiver error model used to simulate packet loss",

                   PointerValue (),

                   MakePointerAccessor (&CsmaNetDevice::m_receiveErrorModel),

                   MakePointerChecker<ErrorModel> ())

    .AddAttribute ("TxQueue", 

                   "A queue to use as the transmit queue in the device.",

                   PointerValue (),

                   MakePointerAccessor (&CsmaNetDevice::m_queue),

                   MakePointerChecker<Queue> ())

    .AddTraceSource ("Rx", 

                     "The trace source to fire on reception of a MAC packet.",

                     MakeTraceSourceAccessor (&CsmaNetDevice::m_rxTrace))

    .AddTraceSource ("Drop", 

                     "Trace source to fire on when a MAC packet is dropped.",

                     MakeTraceSourceAccessor (&CsmaNetDevice::m_dropTrace))

    ;

  return tid;

}

CsmaNetDevice::CsmaNetDevice ()

  : m_name (""),

    m_linkUp (false)

{

  NS_LOG_FUNCTION (this);

  m_txMachineState = READY;

  m_tInterframeGap = Seconds (0);

  m_channel = 0; 

  // 

  // We would like to let the attribute system take care of initializing the packet encapsulation stuff, but we also don't want to

  // get caught up in initialization order changes.  So we'll get the three problem variables into a consistent state here before the

  // attribute calls, and then depend on the semantics of the setters to preserve a consistent state.  This really doesn't have to be

  // the same set of values as the initial values set by the attributes, but it does have to be a consistent set.  That is, you can

  // just change the ddfault encapsulation mode above without having to change it here.  We keep it the same for GP.

  //

  m_encapMode = DIX;

  m_frameSize = DEFAULT_FRAME_SIZE;

  m_mtu = MtuFromFrameSize (m_frameSize);

}

CsmaNetDevice::~CsmaNetDevice()

{

  NS_LOG_FUNCTION_NOARGS ();

  m_queue = 0;

}

  void 

CsmaNetDevice::DoDispose ()

{

  NS_LOG_FUNCTION_NOARGS ();

  m_channel = 0;

  m_node = 0;

  NetDevice::DoDispose ();

}

  uint32_t

CsmaNetDevice::MtuFromFrameSize (uint32_t frameSize)

{

  NS_LOG_FUNCTION (frameSize);

  NS_ASSERT_MSG (frameSize <= std::numeric_limits<uint16_t>::max (), 

                 "CsmaNetDevice::MtuFromFrameSize(): Frame size should be derived from 16-bit quantity: " << frameSize);

  uint32_t newSize;

  switch (m_encapMode) 

    {

    case DIX:

      newSize = frameSize - ETHERNET_OVERHEAD;

      break;

    case LLC: 

      {

        LlcSnapHeader llc;

        NS_ASSERT_MSG ((uint32_t)(frameSize - ETHERNET_OVERHEAD) >= llc.GetSerializedSize (), 

                       "CsmaNetDevice::MtuFromFrameSize(): Given frame size too small to support LLC mode");

        newSize = frameSize - ETHERNET_OVERHEAD - llc.GetSerializedSize ();

      }

      break;

    case ILLEGAL:

    default:

      NS_FATAL_ERROR ("CsmaNetDevice::MtuFromFrameSize(): Unknown packet encapsulation mode");

      return 0;

    }

  return newSize;

}

  uint32_t

CsmaNetDevice::FrameSizeFromMtu (uint32_t mtu)

{

  NS_LOG_FUNCTION (mtu);

  uint32_t newSize;

  switch (m_encapMode) 

    {

    case DIX:

      newSize = mtu + ETHERNET_OVERHEAD;

      break;

    case LLC: 

      {

        LlcSnapHeader llc;

        newSize = mtu + ETHERNET_OVERHEAD + llc.GetSerializedSize ();

      }

      break;

    case ILLEGAL:

    default:

      NS_FATAL_ERROR ("CsmaNetDevice::FrameSizeFromMtu(): Unknown packet encapsulation mode");

      return 0;

    }

  return newSize;

}

  void 

CsmaNetDevice::SetEncapsulationMode (enum EncapsulationMode mode)

{

  NS_LOG_FUNCTION (mode);

  m_encapMode = mode;

  m_mtu = MtuFromFrameSize (m_frameSize);

  NS_LOG_LOGIC ("m_encapMode = " << m_encapMode);

  NS_LOG_LOGIC ("m_frameSize = " << m_frameSize);

  NS_LOG_LOGIC ("m_mtu = " << m_mtu);

}

  CsmaNetDevice::EncapsulationMode

CsmaNetDevice::GetEncapsulationMode (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_encapMode;

}

  bool

CsmaNetDevice::SetMtu (uint16_t mtu)

{

  NS_LOG_FUNCTION (mtu);

  uint32_t newFrameSize = FrameSizeFromMtu (mtu);

  if (newFrameSize > std::numeric_limits<uint16_t>::max ())

    {

      NS_LOG_WARN ("CsmaNetDevice::SetMtu(): Frame size overflow, MTU not set.");

      return false;

    }

  m_frameSize = newFrameSize;

  m_mtu = mtu;

  NS_LOG_LOGIC ("m_encapMode = " << m_encapMode);

  NS_LOG_LOGIC ("m_frameSize = " << m_frameSize);

  NS_LOG_LOGIC ("m_mtu = " << m_mtu);

  return true;

}

  uint16_t

CsmaNetDevice::GetMtu (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_mtu;

}

  void 

CsmaNetDevice::SetFrameSize (uint16_t frameSize)

{

  NS_LOG_FUNCTION (frameSize);

  m_frameSize = frameSize;

  m_mtu = MtuFromFrameSize (frameSize);

  NS_LOG_LOGIC ("m_encapMode = " << m_encapMode);

  NS_LOG_LOGIC ("m_frameSize = " << m_frameSize);

  NS_LOG_LOGIC ("m_mtu = " << m_mtu);

}

  uint16_t

CsmaNetDevice::GetFrameSize (void) const

{

  return m_frameSize;

}

  void 

CsmaNetDevice::SetAddress (Mac48Address self)

{

  NS_LOG_FUNCTION (self);

  m_address = self;

}

  void

CsmaNetDevice::SetSendEnable (bool sendEnable)

{

  NS_LOG_FUNCTION (sendEnable);

  m_sendEnable = sendEnable;

}

  void

CsmaNetDevice::SetReceiveEnable (bool receiveEnable)

{

  NS_LOG_FUNCTION (receiveEnable);

  m_receiveEnable = receiveEnable;

}

  bool

CsmaNetDevice::IsSendEnabled (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_sendEnable;

}

  bool

CsmaNetDevice::IsReceiveEnabled (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_receiveEnable;

}

  void 

CsmaNetDevice::SetInterframeGap (Time t)

{

  NS_LOG_FUNCTION (t);

  m_tInterframeGap = t;

}

  void 

CsmaNetDevice::SetBackoffParams (Time slotTime, uint32_t minSlots, uint32_t maxSlots, uint32_t ceiling, uint32_t maxRetries)

{

  NS_LOG_FUNCTION (slotTime << minSlots << maxSlots << ceiling << maxRetries);

  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;

}

  void 

CsmaNetDevice::AddHeader (Ptr<Packet> p,   Mac48Address source,  Mac48Address dest,  uint16_t protocolNumber)

{

  NS_LOG_FUNCTION (p << source << dest << protocolNumber);

  EthernetHeader header (false);

  header.SetSource (source);

  header.SetDestination (dest);

  EthernetTrailer trailer;

  NS_LOG_LOGIC ("p->GetSize () = " << p->GetSize ());

  NS_LOG_LOGIC ("m_encapMode = " << m_encapMode);

  NS_LOG_LOGIC ("m_mtu = " << m_mtu);

  NS_LOG_LOGIC ("m_frameSize = " << m_frameSize);

  uint16_t lengthType = 0;

  switch (m_encapMode) 

    {

    case DIX:

      NS_LOG_LOGIC ("Encapsulating packet as DIX (type interpretation)");

      //

      // This corresponds to the type interpretation of the lengthType field as in the old Ethernet Blue Book.

      //

      lengthType = protocolNumber;

      break;

    case LLC: 

      {

        NS_LOG_LOGIC ("Encapsulating packet as LLC (length interpretation)");

        LlcSnapHeader llc;

        llc.SetType (protocolNumber);

        p->AddHeader (llc);

        //

        // This corresponds to the length interpretation of the lengthType field,

        // but with an LLC/SNAP header added to the payload as in IEEE 802.2

        //      

        lengthType = p->GetSize ();

        NS_ASSERT_MSG (lengthType <= m_frameSize - 18,

          "CsmaNetDevice::AddHeader(): 802.3 Length/Type field with LLC/SNAP: "

          "length interpretation must not exceed device frame size minus overhead");

      }

      break;

    case ILLEGAL:

    default:

      NS_FATAL_ERROR ("CsmaNetDevice::AddHeader(): Unknown packet encapsulation mode");

      break;

    }

  NS_LOG_LOGIC ("header.SetLengthType (" << lengthType << ")");

  header.SetLengthType (lengthType);

  p->AddHeader (header);

  trailer.CalcFcs (p);

  p->AddTrailer (trailer);

}

  bool 

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

{

  NS_LOG_FUNCTION (p << param);

  EthernetTrailer trailer;

  p->RemoveTrailer (trailer);

  trailer.CheckFcs (p);

  EthernetHeader header (false);

  p->RemoveHeader (header);

  if ((header.GetDestination () != GetBroadcast ()) &&

      (header.GetDestination () != GetAddress ()))

    {

      return false;

    }

  switch (m_encapMode)

    {

    case DIX:

      param = header.GetLengthType ();

      break;

    case LLC: 

      {

        LlcSnapHeader llc;

        p->RemoveHeader (llc);

        param = llc.GetType ();

      } 

      break;

    case ILLEGAL:

    default:

      NS_FATAL_ERROR ("CsmaNetDevice::ProcessHeader(): Unknown packet encapsulation mode");

      break;

    }

  return true;

}

  void

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.

  //

  NS_ASSERT_MSG ((m_txMachineState == READY) || (m_txMachineState == BACKOFF), 

                 "Must be READY to transmit. Tx state is: " << m_txMachineState);

  //

  // Only transmit if send side of net device is enabled

  //

  if (IsSendEnabled () == false)

    {

      return;

    }

  if (m_channel->GetState () != IDLE)

    {

      //

      // The channel is busy -- backoff and rechedule TransmitStart ()

      //

      m_txMachineState = BACKOFF;

      if (m_backoff.MaxRetriesReached ())

        { 

          //

          // Too many retries, abort transmission of packet

          //

          TransmitAbort ();

        } 

      else 

        {

          m_backoff.IncrNumRetries ();

          Time backoffTime = m_backoff.GetBackoffTime ();

          NS_LOG_LOGIC ("Channel busy, backing off for " << backoffTime.GetSeconds () << " sec");

          Simulator::Schedule (backoffTime, &CsmaNetDevice::TransmitStart, this);

        }

    } 

  else 

    {

      //

      // The channel is free, transmit the packet

      //

      m_txMachineState = BUSY;

      Time tEvent = Seconds (m_bps.CalculateTxTime (m_currentPkt->GetSize ()));

      NS_LOG_LOGIC ("Schedule TransmitCompleteEvent in " << tEvent.GetSeconds () << "sec");

      Simulator::Schedule (tEvent, &CsmaNetDevice::TransmitCompleteEvent, this);

      if (m_channel->TransmitStart (m_currentPkt, m_deviceId) == false)

        {

          NS_LOG_WARN ("Channel transmit start did not work at " << tEvent.GetSeconds () << "sec");

          m_txMachineState = READY;

        } 

      else 

        {

          //

          // Transmission succeeded, reset the backoff time parameters.

          //

          m_backoff.ResetBackoffTime ();

        }

    }

}

  void

CsmaNetDevice::TransmitAbort (void)

{

  NS_LOG_FUNCTION_NOARGS ();

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

  //

  // Since we were transmitting a packet, that packet had better be on the transmit queue.

  //

  m_currentPkt = m_queue->Dequeue ();

  NS_ASSERT_MSG (m_currentPkt != 0, "No Packet on queue during CsmaNetDevice::TransmitAbort()");

  //

  // The last one failed.  Let's try to transmit the next one (if there)

  //

  m_backoff.ResetBackoffTime ();

  m_txMachineState = READY;

  TransmitStart ();

}

  void

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.

  //

  NS_ASSERT_MSG (m_txMachineState == BUSY, "Must be BUSY if transmitting");

  NS_ASSERT (m_channel->GetState () == TRANSMITTING);

  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");

  Simulator::Schedule (m_tInterframeGap, &CsmaNetDevice::TransmitReadyEvent, this);

}

  void

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.

  //

  NS_ASSERT_MSG (m_txMachineState == GAP, "Must be in interframe gap");

  m_txMachineState = READY;

  //

  // Get the next packet from the queue for transmitting

  //

  if (m_queue->IsEmpty ())

    {

      return;

    }

  else

    {

      m_currentPkt = m_queue->Dequeue ();

      NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::TransmitReadyEvent(): IsEmpty false but no Packet on queue?");

      TransmitStart ();

    }

}

  bool

CsmaNetDevice::Attach (Ptr<CsmaChannel> ch)

{

  NS_LOG_FUNCTION (this << &ch);

  m_channel = ch;

  m_deviceId = m_channel->Attach (this);

  //

  // The channel provides us with the transmitter data rate.

  //

  m_bps = m_channel->GetDataRate ();

  //

  // We use the Ethernet interframe gap of 96 bit times.

  //

  m_tInterframeGap = Seconds (m_bps.CalculateTxTime (96/8));

  //

  // This device is up whenever a channel is attached to it.

  //

  NotifyLinkUp ();

  return true;

}

  void

CsmaNetDevice::SetQueue (Ptr<Queue> q)

{

  NS_LOG_FUNCTION (q);

  m_queue = q;

}

  void

CsmaNetDevice::SetReceiveErrorModel (Ptr<ErrorModel> em)

{

  NS_LOG_FUNCTION (em);

  m_receiveErrorModel = em; 

}

  void

CsmaNetDevice::Receive (Ptr<Packet> packet, Ptr<CsmaNetDevice> senderDevice)

{

  NS_LOG_FUNCTION (packet << senderDevice);

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

  /* IPv6 support*/

  uint8_t mac[6];

  Mac48Address multicast6AllNodes("33:33:00:00:00:01");

  Mac48Address multicast6AllRouters("33:33:00:00:00:02");

  Mac48Address multicast6AllHosts("33:33:00:00:00:03");

  Mac48Address multicast6Node; /* multicast address addressed to our MAC address */

  /* generate IPv6 multicast ethernet destination that nodes will accept */

  GetAddress().CopyTo(mac);

  mac[0]=0x33;

  mac[1]=0x33;

  /* mac[2]=0xff; */

  multicast6Node.CopyFrom(mac);

  //

  // We never forward up packets that we sent. Real devices don't do this since

  // their receivers are disabled during send, so we don't. Drop the packet

  // silently (no tracing) since it would really never get here in a real device.

  // 

  if (senderDevice == this)

    {

      return;

    }

  // 

  // Only receive if the send side of net device is enabled

  //

  if (IsReceiveEnabled () == false)

    {

      m_dropTrace (packet);

      return;

    }

  //

  // Trace sinks will expect complete packets, not packets without some of the

  // headers.

  //

  Ptr<Packet> originalPacket = packet->Copy ();

  EthernetTrailer trailer;

  packet->RemoveTrailer (trailer);

  trailer.CheckFcs (packet);

  EthernetHeader header (false);

  packet->RemoveHeader (header);

  NS_LOG_LOGIC ("Pkt source is " << header.GetSource ());

  NS_LOG_LOGIC ("Pkt destination is " << header.GetDestination ());

  if (m_receiveErrorModel && m_receiveErrorModel->IsCorrupt (packet) )

    {

      NS_LOG_LOGIC ("Dropping pkt due to error model ");

      m_dropTrace (packet);

    }

  else

    {

      //

      // variable <protocol> must be initialized to avoid a compiler warning in the RAW case that breaks the optimized build.

      //

      uint16_t protocol = 0;

      switch (m_encapMode)

        {

        case DIX:

          protocol = header.GetLengthType ();

          break;

        case LLC: 

          {

            LlcSnapHeader llc;

            packet->RemoveHeader (llc);

            protocol = llc.GetType ();

          } 

          break;

        case ILLEGAL:

        default:

          NS_FATAL_ERROR ("CsmaNetDevice::Receive(): Unknown packet encapsulation mode");

          break;

        }

      PacketType packetType;

      if (header.GetDestination ().IsBroadcast ())

        {

          packetType = PACKET_BROADCAST;

          m_rxTrace (originalPacket);

        }

      else if (header.GetDestination ().IsMulticast () ||

          header.GetDestination() == multicast6Node ||

          header.GetDestination() == multicast6AllNodes ||

          header.GetDestination() == multicast6AllRouters ||

          header.GetDestination() == multicast6AllHosts)

        {

          packetType = PACKET_MULTICAST;          

          m_rxTrace (originalPacket);

        }

      else if (header.GetDestination () == m_address)

        {

          packetType = PACKET_HOST;

          m_rxTrace (originalPacket);

        }

      else

        {

          packetType = PACKET_OTHERHOST;

        }

      if (!m_promiscRxCallback.IsNull ())

        {

          m_promiscRxCallback (this, packet, protocol, header.GetSource (), header.GetDestination (), packetType);

        }

      if (packetType != PACKET_OTHERHOST)

        {

          m_rxCallback (this, packet, protocol, header.GetSource ());

        }

    }

}

  Ptr<Queue>

CsmaNetDevice::GetQueue (void) const 

{ 

  NS_LOG_FUNCTION_NOARGS ();

  return m_queue;

}

  void

CsmaNetDevice::NotifyLinkUp (void)

{

  NS_LOG_FUNCTION_NOARGS ();

  m_linkUp = true;

  if (m_linkChangeCallback.IsNull () == false)

    {

      m_linkChangeCallback ();

    }

}

  void 

CsmaNetDevice::SetName (const std::string name)

{

  NS_LOG_FUNCTION (name);

  m_name = name;

}

  std::string 

CsmaNetDevice::GetName (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_name;

}

  void 

CsmaNetDevice::SetIfIndex (const uint32_t index)

{

  NS_LOG_FUNCTION (index);

  m_ifIndex = index;

}

  uint32_t 

CsmaNetDevice::GetIfIndex (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_ifIndex;

}

  Ptr<Channel> 

CsmaNetDevice::GetChannel (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_channel;

}

  Address 

CsmaNetDevice::GetAddress (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_address;

}

  bool 

CsmaNetDevice::IsLinkUp (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_linkUp;

}

  void 

CsmaNetDevice::SetLinkChangeCallback (Callback<void> callback)

{

  NS_LOG_FUNCTION (&callback);

  m_linkChangeCallback = callback;

}

  bool 

CsmaNetDevice::IsBroadcast (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return true;

}

  Address

CsmaNetDevice::GetBroadcast (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return Mac48Address ("ff:ff:ff:ff:ff:ff");

}

  bool 

CsmaNetDevice::IsMulticast (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return true;

}

  Address 

CsmaNetDevice::GetMulticast (Ipv4Address multicastGroup) const

{

  NS_LOG_FUNCTION (multicastGroup);

  Mac48Address ad = Mac48Address::GetMulticast (multicastGroup);

  //

  // Implicit conversion (operator Address ()) is defined for Mac48Address, so

  // use it by just returning the EUI-48 address which is automagically converted

  // to an Address.

  //

  NS_LOG_LOGIC ("multicast address is " << ad);

  return ad;

}

  bool 

CsmaNetDevice::IsPointToPoint (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return false;

}

  bool

CsmaNetDevice::Send (Ptr<Packet> packet,const Address& dest, uint16_t protocolNumber)

{

  NS_LOG_FUNCTION (packet << dest << protocolNumber);

  return SendFrom (packet, m_address, dest, protocolNumber);

}

  bool

CsmaNetDevice::SendFrom (Ptr<Packet> packet, const Address& src, const Address& dest, uint16_t protocolNumber)

{

  NS_LOG_FUNCTION (packet << src << dest << protocolNumber);

  NS_LOG_LOGIC ("p=" << packet);

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

  NS_ASSERT (IsLinkUp ());

  //

  // Only transmit if send side of net device is enabled

  //

  if (IsSendEnabled () == false)

    {

      return false;

    }

  Mac48Address destination = Mac48Address::ConvertFrom (dest);

  Mac48Address source = Mac48Address::ConvertFrom (src);

  AddHeader (packet, source, destination, protocolNumber);

  //

  // Place the packet to be sent on the send queue

  //

  if (m_queue->Enqueue(packet) == false)

    {

      return false;

    }

  //

  // If the device is idle, we need to start a transmission. Otherwise,

  // the transmission will be started when the current packet finished

  // transmission (see TransmitCompleteEvent)

  //

  if (m_txMachineState == READY) 

    {

      //

      // The next packet to be transmitted goes in m_currentPkt

      //

      m_currentPkt = m_queue->Dequeue ();

      if (m_currentPkt != 0)

        {

          TransmitStart ();

        }

    }

  return true;

}

  Ptr<Node> 

CsmaNetDevice::GetNode (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return m_node;

}

  void 

CsmaNetDevice::SetNode (Ptr<Node> node)

{

  NS_LOG_FUNCTION (node);

  m_node = node;

  int count = -1;

  if (m_name.size () == 0)

    {

      for (uint32_t i = 0; i < node->GetNDevices (); i++)

        {

          Ptr<NetDevice> dev = node->GetDevice (i);

          if (dynamic_cast<CsmaNetDevice*> (PeekPointer (dev)))

            {

              count++;

              if (dev == this)

                {

                  break;

                }

            }

        }

      std::ostringstream s;

      s << "eth" << count;

      m_name = s.str ();

    }

}

  bool 

CsmaNetDevice::NeedsArp (void) const

{

  NS_LOG_FUNCTION_NOARGS ();

  return true;

}

  void 

CsmaNetDevice::SetReceiveCallback (NetDevice::ReceiveCallback cb)

{

  NS_LOG_FUNCTION (&cb);

  m_rxCallback = cb;

}

Address CsmaNetDevice::GetMulticast (Ipv6Address addr) const

{

  Mac48Address ad = Mac48Address::GetMulticast (addr);

  NS_LOG_LOGIC("MAC IPv6 multicast address is " << ad);

  return ad;

}

  void 

CsmaNetDevice::SetPromiscReceiveCallback (NetDevice::PromiscReceiveCallback cb)

{

  NS_LOG_FUNCTION (&cb);

  m_promiscRxCallback = cb;

}

  bool 

CsmaNetDevice::SupportsSendFrom () const

{

  NS_LOG_FUNCTION_NOARGS ();

  return true;

}

} // namespace ns3