#include "ethernet-net-device.h"

#include "ethernet-channel.h"
#include "ethernet-header2.h"

#include "ns3/error-model.h"
#include "ns3/llc-snap-header.h"
#include "ns3/log.h"
#include "ns3/mac48-address.h"
#include "ns3/pointer.h"
#include "ns3/queue.h"
#include "ns3/simulator.h"
#include "ns3/trace-source-accessor.h"
#include "ns3/uinteger.h"
#include "ns3/ethernet-trailer.h"
#include "ns3/timestamp-tag.h"
#include "ns3/names.h"

namespace ns3
{

NS_LOG_COMPONENT_DEFINE("EthernetNetDevice");

NS_OBJECT_ENSURE_REGISTERED(EthernetNetDevice);

TypeId
EthernetNetDevice::GetTypeId()
{
    static TypeId tid =
        TypeId("ns3::EthernetNetDevice")
            .SetParent<NetDevice>()
            .SetGroupName("Ethernet")
            .AddConstructor<EthernetNetDevice>()
            .AddAttribute("Mtu",
                          "The MAC-level Maximum Transmission Unit",
                          UintegerValue(DEFAULT_MTU),
                          MakeUintegerAccessor(&EthernetNetDevice::SetMtu,
                                               &EthernetNetDevice::GetMtu),
                          MakeUintegerChecker<uint16_t>())
            .AddAttribute("Address",
                          "The MAC address of this device.",
                          Mac48AddressValue(Mac48Address("00:00:00:00:ED:E1")),
                          MakeMac48AddressAccessor(&EthernetNetDevice::m_address),
                          MakeMac48AddressChecker())
            .AddAttribute("DataRate",
                          "The default data rate for point to point links",
                          DataRateValue(DataRate("1Gb/s")),
                          MakeDataRateAccessor(&EthernetNetDevice::m_bps),
                          MakeDataRateChecker())
            .AddAttribute("ReceiveErrorModel",
                          "The receiver error model used to simulate packet loss",
                          PointerValue(),
                          MakePointerAccessor(&EthernetNetDevice::m_receiveErrorModel),
                          MakePointerChecker<ErrorModel>())
            .AddAttribute("preambleAndSFDGap",
                          "Number of byte for the preamble and start of frame delimiter gap",
                          UintegerValue(8),
                          MakeUintegerAccessor(&EthernetNetDevice::m_preambleAndSFDGap),
                            MakeUintegerChecker<uint8_t>())
            .AddAttribute("InterframeGap",
                          "Number of byte for the interframe gap",
                          UintegerValue(12),
                          MakeUintegerAccessor(&EthernetNetDevice::m_interframeGap),
                            MakeUintegerChecker<uint8_t>())

            //
            // Trace sources at the "top" of the net device, where packets transition
            // to/from higher layers.
            //
            .AddTraceSource("MacTx",
                            "Trace source indicating a packet has arrived "
                            "for transmission by this device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macTxTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("MacTxAnimation",
                            "Trace source indicating a packet has arrived "
                            "for transmission by this device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macTxAnimationTrace),
                            "ns3::EthernetNetDevice::MacTxAnimationCallback")
            .AddTraceSource("MacTxDrop",
                            "Trace source indicating a packet has been dropped "
                            "by the device before transmission",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macTxDropTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("MacPromiscRx",
                            "A packet has been received by this device, "
                            "has been passed up from the physical layer "
                            "and is being forwarded up the local protocol stack.  "
                            "This is a promiscuous trace,",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macPromiscRxTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("MacRx",
                            "A packet has been received by this device, "
                            "has been passed up from the physical layer "
                            "and is being forwarded up the local protocol stack.  "
                            "This is a non-promiscuous trace,",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macRxTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("MacRxAnimation",
                            "Trace source indicating a packet has arrived "
                            "in this device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_macRxAnimationTrace),
                            "ns3::EthernetNetDevice::MacRxAnimationCallback")
#if 0
    // Not currently implemented for this device
    .AddTraceSource ("MacRxDrop",
                     "Trace source indicating a packet was dropped "
                     "before being forwarded up the stack",
                     MakeTraceSourceAccessor (&EthernetNetDevice::m_macRxDropTrace),
                     "ns3::Packet::TracedCallback")
#endif
            //
            // Trace sources at the "bottom" of the net device, where packets transition
            // to/from the channel.
            //
            .AddTraceSource("PhyTxBegin",
                            "Trace source indicating a packet has begun "
                            "transmitting over the channel",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_phyTxBeginTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("PhyTxEnd",
                            "Trace source indicating a packet has been "
                            "completely transmitted over the channel",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_phyTxEndTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("PhyTxDrop",
                            "Trace source indicating a packet has been "
                            "dropped by the device during transmission",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_phyTxDropTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("Latency",
                            "Trace source to compute network latency ",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_latencyTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("FIFOState",
                            "Trace source to study the FIFO state ",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_FIFOStateSnifferTrace),
                            "ns3::EthernetNetDevice::m_FIFOStateSnifferTrace")
#if 0
    // Not currently implemented for this device
    .AddTraceSource ("PhyRxBegin",
                     "Trace source indicating a packet has begun "
                     "being received by the device",
                     MakeTraceSourceAccessor (&EthernetNetDevice::m_phyRxBeginTrace),
                     "ns3::Packet::TracedCallback")
#endif
            .AddTraceSource("PhyRxEnd",
                            "Trace source indicating a packet has been "
                            "completely received by the device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_phyRxEndTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("PhyRxDrop",
                            "Trace source indicating a packet has been "
                            "dropped by the device during reception",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_phyRxDropTrace),
                            "ns3::Packet::TracedCallback")

            //
            // Trace sources designed to simulate a packet sniffer facility (tcpdump).
            // Note that there is really no difference between promiscuous and
            // non-promiscuous traces in a point-to-point link.
            //
            .AddTraceSource("Sniffer",
                            "Trace source simulating a non-promiscuous packet sniffer "
                            "attached to the device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_snifferTrace),
                            "ns3::Packet::TracedCallback")
            .AddTraceSource("PromiscSniffer",
                            "Trace source simulating a promiscuous packet sniffer "
                            "attached to the device",
                            MakeTraceSourceAccessor(&EthernetNetDevice::m_promiscSnifferTrace),
                            "ns3::Packet::TracedCallback");
    return tid;
}

EthernetNetDevice::EthernetNetDevice()
{
  NS_LOG_FUNCTION(this);
  m_txMachineState = READY;
  m_channel = nullptr;
  m_linkUp = false;
  m_currentPkt = nullptr;
}

EthernetNetDevice::~EthernetNetDevice()
{
    NS_LOG_FUNCTION(this);
}

void
EthernetNetDevice::AddHeader(Ptr<Packet> p, Mac48Address dst, Mac48Address src, uint16_t ethertype)
{
    NS_LOG_FUNCTION(this);
    EthernetHeader2 ethHeader;
    ethHeader.SetDest(dst);
    ethHeader.SetSrc(src);
    ethHeader.SetEthertype(ethertype);
    p->AddHeader(ethHeader);
}

void
EthernetNetDevice::AddHeader(Ptr<Packet> p, Mac48Address dst, Mac48Address src, uint16_t ethertype, uint16_t vid, uint8_t pcp, uint8_t dei)
{
    NS_LOG_FUNCTION(this);
    EthernetHeader2 ethHeader;
    ethHeader.SetDest(dst);
    ethHeader.SetSrc(src);
    ethHeader.SetEthertype(ethertype);
    ethHeader.SetVlanTag(pcp, dei, vid);
    p->AddHeader(ethHeader);
}

void
EthernetNetDevice::DoDispose()
{
    NS_LOG_FUNCTION(this);
    m_node = nullptr;
    m_channel = nullptr;
    m_receiveErrorModel = nullptr;
    m_currentPkt = nullptr;
    m_queues.clear();
    NetDevice::DoDispose();
}

void
EthernetNetDevice::SetDataRate(DataRate bps)
{
    NS_LOG_FUNCTION(this);
    m_bps = bps;
}

bool
EthernetNetDevice::TransmitStart(Ptr<Packet> p)
{
    NS_LOG_FUNCTION(this << p);
    NS_ASSERT_MSG(m_channel != nullptr, "Channel ptr is null");

    NS_LOG_INFO(Names::FindName(this) << " PKT #" << p->GetUid() << " at " << Simulator::Now().GetNanoSeconds()<<" Transmit started ");

    //Add a tag to compute delay between reception(or FIFO enter if first
    //emission port) and transmission start
    TimestampTag tag(Simulator::Now());
    p->AddByteTag(tag);

    //
    // 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 the transmission is complete.
    //
    NS_ASSERT_MSG(m_txMachineState == READY, "Must be READY to transmit");
    m_txMachineState = BUSY;
    m_currentPkt = p;
    m_phyTxBeginTrace(m_currentPkt);

    Time preambleAndSFDGapTime = m_bps.CalculateBytesTxTime(m_preambleAndSFDGap);
    Time txTime = m_bps.CalculateBytesTxTime(p->GetSize());
    Time interpacketGapTime = m_bps.CalculateBytesTxTime(m_interframeGap);
    Time txCompleteTime = preambleAndSFDGapTime + txTime + interpacketGapTime;

    //NS_LOG_INFO(Names::FindName(this) << " "<< Simulator::Now().GetNanoSeconds()<<" Transmit pkt #"<<p->GetUid());
    //NS_LOG_LOGIC(Names::FindName(this) << " Schedule TransmitCompleteEvent in " << txCompleteTime.As(Time::S) << " for PKT #" << p->GetUid());
    Simulator::Schedule(txCompleteTime, &EthernetNetDevice::TransmitComplete, this);

    bool result = m_channel->TransmitStart(p, this, txCompleteTime-interpacketGapTime); //Pkt don't need to wait for the end of Interpacket gap to be considered as receive on the other end of the link
    if (!result)
    {
        m_phyTxDropTrace(p);
    }
    return result;
}

void
EthernetNetDevice::TransmitComplete()
{
    NS_LOG_FUNCTION(this);

    NS_LOG_INFO(Names::FindName(this) << " PKT #" << m_currentPkt->GetUid() << " at " << Simulator::Now().GetNanoSeconds()<<" Transmit completed ");
    // NS_LOG_INFO(Names::FindName(this) << " "<< Simulator::Now().GetNanoSeconds()<<" Transmit completed pkt ");
    //
    // This function is called to when we're all done transmitting a packet.
    // We try and pull another packet off of the transmit queue.  If the queue
    // is empty, we are done, otherwise we need to start transmitting the
    // next packet.
    //
    NS_ASSERT_MSG(m_txMachineState == BUSY, "Must be BUSY if transmitting");
    m_txMachineState = READY;

    NS_ASSERT_MSG(m_currentPkt, "EthernetNetDevice::TransmitComplete(): m_currentPkt zero");

    m_phyTxEndTrace(m_currentPkt);

    m_currentPkt = nullptr;

    //Add the event after all the already present at this exact instant to avoid
    //the beginning of a transmission if a packet will be ready at the event just
    //after but at the same time instant.
    Simulator::Schedule(Time(0), &EthernetNetDevice::CheckForReadyPacket, this);
}


void
EthernetNetDevice::CheckForReadyPacket()
{
  NS_LOG_FUNCTION(this);
  if (m_txMachineState != READY){
    return;
   }

  int next_queue_id = TransmitSelection();
  if(next_queue_id==-1)
  {
    return;
  }
  Ptr<Packet> p = m_queues[next_queue_id]->Dequeue();
  //
  // Got another packet off of the queue, so start the transmit process again.
  //
  m_snifferTrace(p);
  m_promiscSnifferTrace(p);
  TransmitStart(p);

}

int
EthernetNetDevice::TransmitSelection()
{
  NS_LOG_FUNCTION(this);

  //For now simple Static Priority Algo
  for (int i = m_queues.size(); i --> 0; )
  {
      if(!m_queues[i]->IsEmpty())
      {
        return(i);
      }
  }

  return(-1);
}


bool
EthernetNetDevice::Attach(Ptr<EthernetChannel> ch)
{
    NS_LOG_FUNCTION(this << &ch);

    m_channel = ch;

    m_channel->Attach(this);

    //
    // This device is up whenever it is attached to a channel.  A better plan
    // would be to have the link come up when both devices are attached, but this
    // is not done for now.
    //
    NotifyLinkUp();
    return true;
}

void
EthernetNetDevice::SetQueue(Ptr<Queue<Packet>> q)
{
    NS_LOG_FUNCTION(this << q);
    m_queues.insert(m_queues.end(),q);
}

void
EthernetNetDevice::SetReceiveErrorModel(Ptr<ErrorModel> em)
{
    NS_LOG_FUNCTION(this << em);
    m_receiveErrorModel = em;
}

void
EthernetNetDevice::Receive(Ptr<Packet> packet)
{
    NS_LOG_FUNCTION(this << packet);
    NS_LOG_LOGIC("UID is " << packet->GetUid());
    if (m_receiveErrorModel && m_receiveErrorModel->IsCorrupt(packet))
    {
        //
        // If we have an error model and it indicates that it is time to lose a
        // corrupted packet, don't forward this packet up, let it go.
        //
        NS_LOG_LOGIC("Dropping pkt due to error model ");
        m_phyRxDropTrace(packet);
    }
    else
    {
        //Add timestamp to measure delay in the switches
        TimestampTag tag(Simulator::Now());
        packet->AddByteTag(tag);
        //
        // Hit the trace hooks.  All of these hooks are in the same place in this
        // device because it is so simple, but this is not usually the case in
        // more complicated devices.
        //
        m_snifferTrace(packet);
        m_promiscSnifferTrace(packet);
        m_phyRxEndTrace(packet);

        //
        // Trace sinks will expect complete packets, not packets without some of the
        // headers.
        //
        Ptr<Packet> originalPacket = packet->Copy();

        EthernetTrailer trailer;
        packet->RemoveTrailer(trailer);
        if (Node::ChecksumEnabled())
        {
            trailer.EnableFcs(true);
        }

        bool crcGood = trailer.CheckFcs(packet);
        if (!crcGood)
        {
            NS_LOG_INFO("CRC error on Packet " << packet);
            m_phyRxDropTrace(packet);
            return;
        }

        //
        // Strip off the ethernet protocol header and forward this packet
        // up the protocol stack.  Since this is a simple point-to-point link,
        // there is no difference in what the promisc callback sees and what the
        // normal receive callback sees.
        //
        EthernetHeader2 header;
        packet->RemoveHeader(header);

        uint16_t protocol;
        protocol = header.GetEthertype();

        //
        // Classify the packet based on its destination.
        //
        PacketType packetType;

        if (header.GetDest() == m_address)
        {
            packetType = PACKET_HOST;
        }
        else if (header.GetDest().IsGroup())
        {
            packetType = PACKET_MULTICAST;
        }
        else if (header.GetDest().IsBroadcast())
        {
            packetType = PACKET_BROADCAST;
        }
        else
        {
            packetType = PACKET_OTHERHOST;
        }

        if (!m_promiscCallback.IsNull())
        {
            m_macPromiscRxTrace(originalPacket->Copy());
            m_promiscCallback(this,
                              originalPacket,
                              protocol,
                              header.GetSrc(),
                              header.GetDest(),
                              packetType);
        }
        //
        // If this packet is not destined for some other host, it must be for us
        // as either a broadcast, multicast or unicast.  We need to hit the mac
        // packet received trace hook and forward the packet up the stack.
        //
        if (packetType != PACKET_OTHERHOST)
        {
            //NS_LOG_INFO((Simulator::Now()).As(Time::S) << " \t" << Names::FindName(m_node) << "/" << Names::FindName(this) <<" : Pkt #" << originalPacket->GetUid() <<" received by the netDevice ! " << originalPacket->ToString());
            m_macRxTrace(originalPacket);
            m_macRxAnimationTrace(originalPacket, this);
            m_rxCallback(this, packet, protocol, header.GetSrc());
            m_latencyTrace(originalPacket);
        }
    }
}

Ptr<Queue<Packet>>
EthernetNetDevice::GetQueue(uint8_t index) const
{
    NS_LOG_FUNCTION(this);
    return m_queues[index];
}

void
EthernetNetDevice::NotifyLinkUp()
{
    NS_LOG_FUNCTION(this);
    m_linkUp = true;
    m_linkChangeCallbacks();
}

void
EthernetNetDevice::SetIfIndex(const uint32_t index)
{
    NS_LOG_FUNCTION(this);
    m_ifIndex = index;
}

uint32_t
EthernetNetDevice::GetIfIndex() const
{
    return m_ifIndex;
}

Ptr<Channel>
EthernetNetDevice::GetChannel() const
{
    return m_channel;
}


void
EthernetNetDevice::SetAddress(Address address)
{
    NS_LOG_FUNCTION(this << address);
    m_address = Mac48Address::ConvertFrom(address);
}

Address
EthernetNetDevice::GetAddress() const
{
    return m_address;
}


bool
EthernetNetDevice::IsLinkUp() const
{
    NS_LOG_FUNCTION(this);
    return m_linkUp;
}

void
EthernetNetDevice::AddLinkChangeCallback(Callback<void> callback)
{
    NS_LOG_FUNCTION(this);
    m_linkChangeCallbacks.ConnectWithoutContext(callback);
}

//
// This is a ethernet device, so every transmission is a broadcast to
// all of the devices on the channel.
//
bool
EthernetNetDevice::IsBroadcast() const
{
    NS_LOG_FUNCTION(this);
    return true;
}

Address
EthernetNetDevice::GetBroadcast() const
{
    NS_LOG_FUNCTION(this);
    return Mac48Address("ff:ff:ff:ff:ff:ff");
}

bool
EthernetNetDevice::IsMulticast() const
{
    NS_LOG_FUNCTION(this);
    return true;
}

Address
EthernetNetDevice::GetMulticast(Ipv4Address multicastGroup) const
{
    NS_LOG_FUNCTION(this);
    return Mac48Address("01:00:5e:00:00:00");
}

Address
EthernetNetDevice::GetMulticast(Ipv6Address addr) const
{
    NS_LOG_FUNCTION(this << addr);
    return Mac48Address("33:33:00:00:00:00");
}

bool
EthernetNetDevice::IsPointToPoint() const
{
    NS_LOG_FUNCTION(this);
    return true;
}

bool
EthernetNetDevice::IsBridge() const
{
    NS_LOG_FUNCTION(this);
    return false;
}


bool
EthernetNetDevice::Send(Ptr<Packet> packet, const Address& dest, uint16_t ethertype)
{
  uint16_t vid = 65535;
  uint8_t pcp = 0;
  uint8_t dei = 0;
  return SendFrom(packet, GetAddress(), dest, ethertype, vid, pcp, dei);
}

bool
EthernetNetDevice::Send(Ptr<Packet> packet, const Address& dest, uint16_t ethertype, uint16_t vid, uint8_t pcp, uint8_t dei)
{
    return SendFrom(packet, GetAddress(), dest, ethertype, vid, pcp, dei);
}

bool
EthernetNetDevice::SendFrom(Ptr<Packet> packet,
                                const Address& source,
                                const Address& dest,
                                uint16_t ethertype)
{
  //Call by the switch net device with a packet with a EhternetHeader2 and EthernetTrailer
  //Or by another SendFrom function that have already have a packet with header and trailer
  // /!\ source, dest, and ethertype are not use in this function but are needed in
  // the callback define by the netDevice class
  //
  // If IsLinkUp() is false it means there is no channel to send any packet
  // over so we just hit the drop trace on the packet and return an error.
  //
  if (!IsLinkUp())
  {
      m_macTxDropTrace(packet);
      return false;
  }

  //Add timestamp if first emission
  TimestampTag tag(Simulator::Now());
  if (!packet->FindFirstMatchingByteTag(tag))
  {
          packet->AddByteTag(tag);
  }
  m_macTxTrace(packet);
  m_macTxAnimationTrace(packet, this);

  Ptr<Packet> pCopy = packet->Copy();
  EthernetHeader2 header;
  pCopy->RemoveHeader(header);
  uint8_t pcp = header.GetPcp();

  NS_ASSERT_MSG(m_queues.size() > pcp, "Not enough fifos ( 0 to "<< m_queues.size()-1 <<") to handle this pcp priority ("<< unsigned(pcp) <<") on Node " <<Names::FindName(GetNode()));


  m_FIFOStateSnifferTrace(m_queues, m_txMachineState==BUSY, packet);
  //
  // We should enqueue and dequeue the packet to hit the tracing hooks.
  //
  if (m_queues[pcp]->Enqueue(packet))
  {
      NS_LOG_INFO(Names::FindName(this) << " Enqueue pkt #"<<packet->GetUid() << " OK !");
      //Add the event after all the already present at this exact instant to avoid
      //the beginning of a transmission if a packet will be ready at the event just
      //after but at the same time instant.
      Simulator::Schedule(Time(0), &EthernetNetDevice::CheckForReadyPacket, this);
      return true;
  }

  // Enqueue may fail (overflow)
  m_macTxDropTrace(packet);

  return false;
}

bool
EthernetNetDevice::SendFrom(Ptr<Packet> packet, const Address& source, const Address& dest, uint16_t ethertype, uint16_t vid, uint8_t pcp, uint8_t dei)
{
  NS_LOG_FUNCTION(this << packet << dest << ethertype);
  NS_LOG_LOGIC(Names::FindName(this) << " p=" << packet->GetUid() << ", dest=" << &dest);

  // NS_LOG_INFO(Names::FindName(this) << " SendFrom : p=" << packet->GetUid() << ", dest=" << &dest << " at " << Simulator::Now());


  if (vid == 65535){
    AddHeader(packet, Mac48Address::ConvertFrom(dest), Mac48Address::ConvertFrom(source), ethertype);
  }
  else{
    AddHeader(packet, Mac48Address::ConvertFrom(dest),  Mac48Address::ConvertFrom(source), ethertype, vid, pcp, dei);
  }

  EthernetTrailer trailer;
  trailer.EnableFcs(true);
  trailer.CalcFcs(packet);
  packet->AddTrailer(trailer);


  return SendFrom(packet, source, dest, ethertype);
}

Ptr<Node>
EthernetNetDevice::GetNode() const
{
    return m_node;
}

void
EthernetNetDevice::SetNode(Ptr<Node> node)
{
    NS_LOG_FUNCTION(this);
    m_node = node;
}

bool
EthernetNetDevice::NeedsArp() const
{
    NS_LOG_FUNCTION(this);
    return false;
}

void
EthernetNetDevice::SetReceiveCallback(NetDevice::ReceiveCallback cb)
{
    m_rxCallback = cb;
}

void
EthernetNetDevice::SetPromiscReceiveCallback(NetDevice::PromiscReceiveCallback cb)
{
    m_promiscCallback = cb;
}

bool
EthernetNetDevice::SupportsSendFrom() const
{
    NS_LOG_FUNCTION(this);
    return true;
}

Address
EthernetNetDevice::GetRemote() const
{
    NS_LOG_FUNCTION(this);
    NS_ASSERT(m_channel->GetNDevices() == 2);
    for (std::size_t i = 0; i < m_channel->GetNDevices(); ++i)
    {
        Ptr<NetDevice> tmp = m_channel->GetDevice(i);
        if (tmp != this)
        {
            return tmp->GetAddress();
        }
    }
    NS_ASSERT(false);
    // quiet compiler.
    return Address();
}

bool
EthernetNetDevice::SetMtu(uint16_t mtu)
{
    NS_LOG_FUNCTION(this << mtu);
    m_mtu = mtu;
    return true;
}

uint16_t
EthernetNetDevice::GetMtu() const
{
    NS_LOG_FUNCTION(this);
    return m_mtu;
}

}