remove unneeded packet copies, includes. Rescan
/* -*- 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 ("ReceiveErrorModel",
"The receiver error model used to simulate packet loss",
PointerValue (),
MakePointerAccessor (&CsmaNetDevice::m_receiveErrorModel),
MakePointerChecker<ErrorModel> ())
//
// Transmit queueing discipline for the device which includes its own set
// of trace hooks.
//
.AddAttribute ("TxQueue",
"A queue to use as the transmit queue in the device.",
PointerValue (),
MakePointerAccessor (&CsmaNetDevice::m_queue),
MakePointerChecker<Queue> ())
//
// 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 (&CsmaNetDevice::m_macTxTrace))
.AddTraceSource ("MacTxDrop",
"Trace source indicating a packet has been dropped by the device before transmission",
MakeTraceSourceAccessor (&CsmaNetDevice::m_macTxDropTrace))
.AddTraceSource ("MacRx",
"Trace source indicating a packet has been received by this device and is being forwarded up the stack",
MakeTraceSourceAccessor (&CsmaNetDevice::m_macRxTrace))
#if 0
// Not currently implemented in this device
.AddTraceSource ("MacRxDrop",
"Trace source indicating a packet was received, but dropped before being forwarded up the stack",
MakeTraceSourceAccessor (&CsmaNetDevice::m_macRxDropTrace))
#endif
.AddTraceSource ("MacTxBackoff",
"Trace source indicating a packet has been delayed by the CSMA backoff process",
MakeTraceSourceAccessor (&CsmaNetDevice::m_macTxBackoffTrace))
//
// Trace souces 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 (&CsmaNetDevice::m_phyTxBeginTrace))
.AddTraceSource ("PhyTxEnd",
"Trace source indicating a packet has been completely transmitted over the channel",
MakeTraceSourceAccessor (&CsmaNetDevice::m_phyTxEndTrace))
.AddTraceSource ("PhyTxDrop",
"Trace source indicating a packet has been dropped by the device during transmission",
MakeTraceSourceAccessor (&CsmaNetDevice::m_phyTxDropTrace))
#if 0
// Not currently implemented in this device
.AddTraceSource ("PhyRxBegin",
"Trace source indicating a packet has begun being received by the device",
MakeTraceSourceAccessor (&CsmaNetDevice::m_phyRxBeginTrace))
#endif
.AddTraceSource ("PhyRxEnd",
"Trace source indicating a packet has been completely received by the device",
MakeTraceSourceAccessor (&CsmaNetDevice::m_phyRxEndTrace))
.AddTraceSource ("PhyRxDrop",
"Trace source indicating a packet has been dropped by the device during reception",
MakeTraceSourceAccessor (&CsmaNetDevice::m_phyRxDropTrace))
//
// Trace sources designed to simulate a packet sniffer facility (tcpdump).
//
.AddTraceSource ("Sniffer",
"Trace source simulating a non-promiscuous packet sniffer attached to the device",
MakeTraceSourceAccessor (&CsmaNetDevice::m_snifferTrace))
.AddTraceSource ("PromiscSniffer",
"Trace source simulating a promiscuous packet sniffer attached to the device",
MakeTraceSourceAccessor (&CsmaNetDevice::m_promiscSnifferTrace))
;
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 default encapsulation mode above without having
// to change it here.
//
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 (void)
{
NS_LOG_FUNCTION_NOARGS ();
//
// This function is called to start the process of transmitting a packet. We
// expect that the packet to transmit will be found in m_currentPkt.
//
NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::TransmitStart(): m_currentPkt not set");
NS_LOG_LOGIC ("m_currentPkt = " << m_currentPkt);
NS_LOG_LOGIC ("UID = " << m_currentPkt->GetUid ());
//
// Only transmit if the send side of net device is enabled
//
if (IsSendEnabled () == false)
{
m_phyTxDropTrace (m_currentPkt);
m_currentPkt = 0;
return;
}
//
// Somebody has called here telling us to start transmitting a packet. They
// can only do this if the state machine is in the READY or BACKOFF state.
// Specifically, if we are ready to start transmitting, we cannot already
// be transmitting (i.e., BUSY)
//
NS_ASSERT_MSG ((m_txMachineState == READY) || (m_txMachineState == BACKOFF),
"Must be READY to transmit. Tx state is: " << m_txMachineState);
//
// Now we have to sense the state of the medium and either start transmitting
// if it is idle, or backoff our transmission if someone else is on the wire.
//
if (m_channel->GetState () != IDLE)
{
//
// The channel is busy -- backoff and rechedule TransmitStart() unless
// we have exhausted all of our retries.
//
m_txMachineState = BACKOFF;
if (m_backoff.MaxRetriesReached ())
{
//
// Too many retries, abort transmission of packet
//
TransmitAbort ();
}
else
{
m_macTxBackoffTrace (m_currentPkt);
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
//
if (m_channel->TransmitStart (m_currentPkt, m_deviceId) == false)
{
NS_LOG_WARN ("Channel TransmitStart returns an error");
m_phyTxDropTrace (m_currentPkt);
m_currentPkt = 0;
m_txMachineState = READY;
}
else
{
//
// Transmission succeeded, reset the backoff time parameters and
// schedule a transmit complete event.
//
m_backoff.ResetBackoffTime ();
m_txMachineState = BUSY;
m_phyTxBeginTrace (m_currentPkt);
Time tEvent = Seconds (m_bps.CalculateTxTime (m_currentPkt->GetSize ()));
NS_LOG_LOGIC ("Schedule TransmitCompleteEvent in " << tEvent.GetSeconds () << "sec");
Simulator::Schedule (tEvent, &CsmaNetDevice::TransmitCompleteEvent, this);
}
}
}
void
CsmaNetDevice::TransmitAbort (void)
{
NS_LOG_FUNCTION_NOARGS ();
//
// When we started the process of transmitting the current packet, it was
// placed in m_currentPkt. So we had better find one there.
//
NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::TransmitAbort(): m_currentPkt zero");
NS_LOG_LOGIC ("m_currentPkt=" << m_currentPkt);
NS_LOG_LOGIC ("Pkt UID is " << m_currentPkt->GetUid () << ")");
m_phyTxDropTrace (m_currentPkt);
m_currentPkt = 0;
NS_ASSERT_MSG (m_txMachineState == BACKOFF, "Must be in BACKOFF state to abort. Tx state is: " << m_txMachineState);
//
// We're done with that one, so reset the backoff algorithm and ready the
// transmit state machine.
//
m_backoff.ResetBackoffTime ();
m_txMachineState = READY;
//
// If there is another packet on the input queue, we need to start trying to
// get that out. If the queue is empty we just wait until someone puts one
// in.
//
if (m_queue->IsEmpty ())
{
return;
}
else
{
m_currentPkt = m_queue->Dequeue ();
NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::TransmitAbort(): IsEmpty false but no Packet on queue?");
m_snifferTrace (m_currentPkt);
m_promiscSnifferTrace (m_currentPkt);
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, "CsmaNetDevice::transmitCompleteEvent(): Must be BUSY if transmitting");
NS_ASSERT (m_channel->GetState () == TRANSMITTING);
m_txMachineState = GAP;
//
// When we started transmitting the current packet, it was placed in
// m_currentPkt. So we had better find one there.
//
NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::TransmitCompleteEvent(): m_currentPkt zero");
NS_LOG_LOGIC ("m_currentPkt=" << m_currentPkt);
NS_LOG_LOGIC ("Pkt UID is " << m_currentPkt->GetUid () << ")");
m_channel->TransmitEnd ();
m_phyTxEndTrace (m_currentPkt);
m_currentPkt = 0;
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, "CsmaNetDevice::TransmitReadyEvent(): Must be in interframe gap");
m_txMachineState = READY;
//
// We expect that the packet we had been transmitting was cleared when the
// TransmitCompleteEvent() was executed.
//
NS_ASSERT_MSG (m_currentPkt == 0, "CsmaNetDevice::TransmitReadyEvent(): m_currentPkt nonzero");
//
// 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?");
m_snifferTrace (m_currentPkt);
m_promiscSnifferTrace (m_currentPkt);
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.
//
if (senderDevice == this)
{
return;
}
//
// Hit the trace hook. This trace will fire on all packets received from the
// channel except those originated by this device.
//
m_phyRxEndTrace (packet);
//
// Only receive if the send side of net device is enabled
//
if (IsReceiveEnabled () == false)
{
m_phyRxDropTrace (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_phyRxDropTrace (packet);
}
else
{
uint16_t protocol;
//
// If the length/type is less than 1500, it corresponds to a length
// interpretation packet. In this case, it is an 802.3 packet and
// will also have an 802.2 LLC header. If greater than 1500, we
// find the protocol number (Ethernet type) directly.
//
if (header.GetLengthType () <= 1500)
{
LlcSnapHeader llc;
packet->RemoveHeader (llc);
protocol = llc.GetType ();
}
else
{
protocol = header.GetLengthType ();
}
//
// Classify the packet based on its destination.
//
PacketType packetType;
if (header.GetDestination ().IsBroadcast ())
{
packetType = PACKET_BROADCAST;
}
else if (header.GetDestination ().IsMulticast () ||
header.GetDestination() == multicast6Node ||
header.GetDestination() == multicast6AllNodes ||
header.GetDestination() == multicast6AllRouters ||
header.GetDestination() == multicast6AllHosts)
{
packetType = PACKET_MULTICAST;
}
else if (header.GetDestination () == m_address)
{
packetType = PACKET_HOST;
}
else
{
packetType = PACKET_OTHERHOST;
}
//
// For all kinds of packetType we receive, we hit the promiscuous sniffer
// hook and pass a copy up to the promiscuous callback. Pass a copy to
// make sure that nobody messes with our packet.
//
m_promiscSnifferTrace (originalPacket);
if (!m_promiscRxCallback.IsNull ())
{
m_promiscRxCallback (this, packet, protocol, header.GetSource (), header.GetDestination (), 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)
{
m_snifferTrace (originalPacket);
m_macRxTrace (originalPacket);
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::IsBridge (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 ("packet =" << packet);
NS_LOG_LOGIC ("UID is " << packet->GetUid () << ")");
NS_ASSERT (IsLinkUp ());
//
// Only transmit if send side of net device is enabled
//
if (IsSendEnabled () == false)
{
m_macTxDropTrace (packet);
return false;
}
Mac48Address destination = Mac48Address::ConvertFrom (dest);
Mac48Address source = Mac48Address::ConvertFrom (src);
AddHeader (packet, source, destination, protocolNumber);
m_macTxTrace (packet);
//
// Place the packet to be sent on the send queue. Note that the
// queue may fire a drop trace, but we will too.
//
if (m_queue->Enqueue(packet) == false)
{
m_macTxDropTrace (packet);
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)
{
if (m_queue->IsEmpty () == false)
{
m_currentPkt = m_queue->Dequeue ();
NS_ASSERT_MSG (m_currentPkt != 0, "CsmaNetDevice::SendFrom(): IsEmpty false but no Packet on queue?");
m_promiscSnifferTrace (packet);
m_snifferTrace (packet);
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