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Unified Diff: src/switched-ethernet/model/switched-ethernet-net-device.h

Issue 5615049: New feature - switched-ethernet-device
Patch Set: Created 12 years, 1 month ago
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Index: src/switched-ethernet/model/switched-ethernet-net-device.h
===================================================================
new file mode 100644
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+++ b/src/switched-ethernet/model/switched-ethernet-net-device.h
@@ -0,0 +1,682 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2012 Jeffrey Young
+ *
+ * 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: Jeff Young <jyoung9@gatech.edu
+ * This code is based on csma-net-device created by
+ * Emmanuelle Laprise <emmanuelle.laprise@bluekazoo.ca>
+ *
+ */
+
+#ifndef SWITCHED_ETHERNET_NET_DEVICE_H
+#define SWITCHED_ETHERNET_NET_DEVICE_H
+
+#include <string.h>
+#include "ns3/node.h"
+#include "ns3/address.h"
+#include "ns3/net-device.h"
+#include "ns3/callback.h"
+#include "ns3/packet.h"
+#include "ns3/traced-callback.h"
+#include "ns3/nstime.h"
+#include "ns3/data-rate.h"
+#include "ns3/ptr.h"
+#include "ns3/random-variable.h"
+#include "ns3/mac48-address.h"
+
+namespace ns3 {
+
+class Queue;
+class SwitchedEthernetChannel;
+class ErrorModel;
+
+/**
+ * \class SwitchedEthernetNetDevice
+ * \brief A Device for a SwitchedEthernet Network Link.
+ *
+ * The SwitchedEthernet net device class is analogous to layer 1 and 2 of the
+ * TCP stack. The NetDevice takes a raw packet of bytes and creates a
+ * protocol specific packet from them.
+ */
+class SwitchedEthernetNetDevice : public NetDevice
+{
+public:
+ static TypeId GetTypeId (void);
+
+ /**
+ * Enumeration of the types of packets supported in the class.
+ */
+ enum EncapsulationMode {
+ ILLEGAL, /**< Encapsulation mode not set */
Vedran Miletić 2012/07/16 12:02:19 Please prefix these with ENCAPSULATION_MODE_
+ DIX, /**< DIX II / Ethernet II packet */
+ LLC, /**< 802.2 LLC/SNAP Packet*/
+ };
+
+ /**
+ * Construct a SwitchedEthernetNetDevice
+ *
+ * This is the default constructor for a SwitchedEthernetNetDevice.
+ */
+ SwitchedEthernetNetDevice ();
+
+ /**
+ * Destroy a SwitchedEthernetNetDevice
+ *
+ * This is the destructor for a SwitchedEthernetNetDevice.
+ */
+ virtual ~SwitchedEthernetNetDevice ();
+
+ /**
+ * Set the interframe gap used to separate packets. The interframe gap
+ * defines the minimum space required between packets sent by this device.
+ * As in Ethernet, it defaults to 96 bit times.
+ *
+ * \param t the interframe gap time
+ */
+ void SetInterframeGap (Time t);
+
+ /**
+ * Attach the device to a channel.
+ *
+ * The function Attach is used to add a SwitchedEthernetNetDevice to a SwitchedEthernetChannel.
Peter Barnes 2012/07/16 20:08:48 Break line (too long)
+ *
+ * \see SetDataRate ()
+ * \see SetInterframeGap ()
+ * \param ch a pointer to the channel to which this object is being attached.
Peter Barnes 2012/07/16 20:08:48 \param ch Ptr to the... Also clarify all Ptr argum
+ */
+ bool Attach (Ptr<SwitchedEthernetChannel> ch);
Peter Barnes 2012/07/16 20:08:48 Document meaning of \return
+
+ /**
+ * Attach a queue to the SwitchedEthernetNetDevice.
+ *
+ * The SwitchedEthernetNetDevice "owns" a queue. This queue may be set by higher
Peter Barnes 2012/07/16 20:08:48 Break line
+ * level topology objects to implement a particular queueing method such as
+ * DropTail or RED.
+ *
+ * \see Queue
+ * \see DropTailQueue
+ * \param queue a Ptr to the queue for being assigned to the device.
+ */
+ void SetQueue (Ptr<Queue> queue);
+
+ /**
+ * Get a copy of the attached Queue.
+ *
+ * \return a pointer to the queue.
+ */
+ Ptr<Queue> GetQueue (void) const;
+
+ /**
+ * Attach a receive ErrorModel to the SwitchedEthernetNetDevice.
+ *
+ * The SwitchedEthernetNetDevice may optionally include an ErrorModel in
+ * the packet receive chain to simulate data errors in during transmission.
Peter Barnes 2012/07/16 20:08:48 "data errors during" (delete "in")
+ *
+ * \see ErrorModel
+ * \param em a pointer to the ErrorModel
+ */
+ void SetReceiveErrorModel (Ptr<ErrorModel> em);
+
+ /**
+ * Receive a packet from a connected SwitchedEthernetChannel.
+ *
+ * The SwitchedEthernetNetDevice receives packets from its connected channel
+ * and forwards them up the protocol stack. This is the public method
+ * used by the channel to indicate that the last bit of a packet has
+ * arrived at the device.
+ *
+ * \see SwitchedEthernetChannel
+ * \param p a reference to the received packet
+ * \param sender the SwitchedEthernetNetDevice that transmitted the packet in the first place
Peter Barnes 2012/07/16 20:08:48 Break line
+ */
+ void Receive (Ptr<Packet> p, Ptr<SwitchedEthernetNetDevice> sender);
+
+ /**
+ * Is the send side of the network device enabled?
+ *
+ * \returns True if the send side is enabled, otherwise false.
+ */
+ bool IsSendEnabled (void);
Peter Barnes 2012/07/16 20:08:48 Should be const?
+
+ /**
+ * Enable or disable the send side of the network device.
+ *
+ * \param enable Enable the send side if true, otherwise disable.
+ */
+ void SetSendEnable (bool enable);
+
+ /**
+ * Is the receive side of the network device enabled?
+ *
+ * \returns True if the receiver side is enabled, otherwise false.
+ */
+ bool IsReceiveEnabled (void);
Peter Barnes 2012/07/16 20:08:48 Should be const?
+
+ /**
+ * Enable or disable the receive side of the network device.
+ *
+ * \param enable Enable the receive side if true, otherwise disable.
+ */
+ void SetReceiveEnable (bool enable);
+
+ /**
+ * Set the encapsulation mode of this device.
+ *
+ * \param mode The encapsulation mode of this device.
+ *
+ */
+ void SetEncapsulationMode (SwitchedEthernetNetDevice::EncapsulationMode mode);
+
+ /**
+ * Get the encapsulation mode of this device.
+ *
+ * \returns The encapsulation mode of this device.
+ */
+ SwitchedEthernetNetDevice::EncapsulationMode GetEncapsulationMode (void);
Peter Barnes 2012/07/16 20:08:48 Should be const?
+
+ //
+ // The following methods are inherited from NetDevice base class.
+ //
+ virtual void SetIfIndex (const uint32_t index);
+ virtual uint32_t GetIfIndex (void) const;
+ virtual Ptr<Channel> GetChannel (void) const;
+ virtual bool SetMtu (const uint16_t mtu);
+ virtual uint16_t GetMtu (void) const;
+ virtual void SetAddress (Address address);
+ virtual Address GetAddress (void) const;
+ virtual bool IsLinkUp (void) const;
+ virtual void AddLinkChangeCallback (Callback<void> callback);
+ virtual bool IsBroadcast (void) const;
+ virtual Address GetBroadcast (void) const;
+ virtual bool IsMulticast (void) const;
+
+ /**
+ * \brief Make and return a MAC multicast address using the provided
+ * multicast group
+ *
+ * RFC 1112 says that an Ipv4 host group address is mapped to an Ethernet
+ * multicast address by placing the low-order 23-bits of the IP address into
+ * the low-order 23 bits of the Ethernet multicast address
+ * 01-00-5E-00-00-00 (hex).
+ *
+ * This method performs the multicast address creation function appropriate
+ * to an EUI-48-based SwitchedEthernet device. This MAC address is encapsulated in an
Peter Barnes 2012/07/16 20:08:48 Break line
+ * abstract Address to avoid dependencies on the exact address format.
+ *
+ * \param multicastGroup The IP address for the multicast group destination
+ * of the packet.
+ * \return The MAC multicast Address used to send packets to the provided
+ * multicast group.
+ *
+ * \see Ipv4Address
+ * \see Mac48Address
+ * \see Address
+ */
+ virtual Address GetMulticast (Ipv4Address multicastGroup) const;
+
+ /**
+ * Is this a point to point link?
+ * \returns false.
+ */
+ virtual bool IsPointToPoint (void) const;
+
+ /**
+ * Is this a bridge?
+ * \returns false.
+ */
+ virtual bool IsBridge (void) const;
+
+ /**
+ * Start sending a packet down the channel.
+ * \param packet packet to send
+ * \param dest layer 2 destination address
+ * \param protocolNumber protocol number
+ * \return true if successfull, false otherwise (drop, ...)
+ */
+ virtual bool Send (Ptr<Packet> packet, const Address& dest,
+ uint16_t protocolNumber);
+
+ /**
+ * Start sending a packet down the channel, with MAC spoofing
+ * \param packet packet to send
+ * \param source layer 2 source address
+ * \param dest layer 2 destination address
+ * \param protocolNumber protocol number
+ * \return true if successfull, false otherwise (drop, ...)
+ */
+ virtual bool SendFrom (Ptr<Packet> packet, const Address& source, const Address& dest,
Peter Barnes 2012/07/16 20:08:48 Break line
+ uint16_t protocolNumber);
+
+ /**
+ * Get the node to which this device is attached.
+ *
+ * \returns Ptr to the Node to which the device is attached.
+ */
+ virtual Ptr<Node> GetNode (void) const;
+
+ /**
+ * Set the node to which this device is being attached.
+ *
+ * \param node Ptr to the Node to which the device is being attached.
+ */
+ virtual void SetNode (Ptr<Node> node);
+
+ /**
+ * Does this device need to use the address resolution protocol?
+ *
+ * \returns True if the encapsulation mode is set to a value that requires
+ * ARP (IP_ARP or LLC).
+ */
+ virtual bool NeedsArp (void) const;
+
+ /**
+ * Set the callback to be used to notify higher layers when a packet has been
+ * received.
+ *
+ * \param cb The callback.
+ */
+ virtual void SetReceiveCallback (NetDevice::ReceiveCallback cb);
+
+ /**
+ * \brief Get the MAC multicast address corresponding
+ * to the IPv6 address provided.
+ * \param addr IPv6 address
+ * \return the MAC multicast address
+ * \warning Calling this method is invalid if IsMulticast returns not true.
+ */
+ virtual Address GetMulticast (Ipv6Address addr) const;
Peter Barnes 2012/07/16 20:08:48 Move up to follow GetMulticast(Ipv4)?
+
+
+ virtual void SetPromiscReceiveCallback (PromiscReceiveCallback cb);
+ virtual bool SupportsSendFrom (void) const;
+
+protected:
+ /**
+ * Perform any object release functionality required to break reference
+ * cycles in reference counted objects held by the device.
+ */
+ virtual void DoDispose (void);
+
+ /**
+ * Adds the necessary headers and trailers to a packet of data in order to
+ * respect the packet type
+ *
+ * \param p Packet to which header should be added
+ * \param source MAC source address from which packet should be sent
+ * \param dest MAC destination address to which packet should be sent
+ * \param protocolNumber In some protocols, identifies the type of
+ * payload contained in this packet.
+ */
+ void AddHeader (Ptr<Packet> p, Mac48Address source, Mac48Address dest, uint16_t protocolNumber);
Peter Barnes 2012/07/16 20:08:48 Break line
+
+private:
+
+ /**
+ * Operator = is declared but not implemented. This disables the assignment
+ * operator for SwitchedEthernetNetDevice objects.
+ * \param o object to copy
+ */
+ SwitchedEthernetNetDevice &operator = (const SwitchedEthernetNetDevice &o);
+
+ /**
+ * Copy constructor is declared but not implemented. This disables the
+ * copy constructor for SwitchedEthernetNetDevice objects.
+ * \param o object to copy
+ */
+ SwitchedEthernetNetDevice (const SwitchedEthernetNetDevice &o);
+
+ /**
+ * Initialization function used during object construction.
+ * \param sendEnable if device will be allowed to send
+ * \param receiveEnable if device will be allowed to receive
+ */
+ void Init (bool sendEnable, bool receiveEnable);
+
+ /**
+ * Start Sending a Packet Down the Wire.
+ *
+ * The TransmitStart method is the method that is used internally in
+ * the SwitchedEthernetNetDevice to begin the process of sending a packet
+ * out on the channel. A corresponding method is called on the
+ * channel to let it know that the physical device this class
+ * represents has actually started sending signals, this causes the
+ * channel to enter the BUSY state. An event is scheduled for the time at
+ * which the bits have been completely transmitted.
+ *
+ * If the channel is found to be BUSY, this method reschedules itself for
+ * execution at a later time (within the backoff period).
+ *
+ * \see SwitchedEthernetChannel::TransmitStart ()
+ * \see TransmitCompleteEvent ()
+ */
+ void TransmitStart ();
+
+ /**
+ * Stop Sending a Packet Down the Wire and Begin the Interframe Gap.
+ *
+ * The TransmitCompleteEvent method is used internally to finish the process
+ * of sending a packet out on the channel. During execution of this method
+ * the TransmitEnd method is called on the channel to let it know that the
+ * physical device this class represents has finished sending simulated
+ * signals. The channel uses this event to begin its speed of light delay
+ * timer after which it notifies the Net Device(s) at the other end of the
+ * link that new bits have arrived (it delivers the Packet). During this
+ * method, the net device also schedules the TransmitReadyEvent at which
+ * time the transmitter becomes ready to send the next packet.
+ *
+ * \see SwitchedEthernetChannel::TransmitEnd ()
+ * \see TransmitReadyEvent ()
+ */
+ void TransmitCompleteEvent (void);
+
+ /**
+ * Cause the Transmitter to Become Ready to Send Another Packet.
+ *
+ * The TransmitReadyEvent method is used internally to re-enable the
+ * transmit machine of the net device. It is scheduled after a suitable
+ * interframe gap after the completion of the previous transmission.
+ * The queue is checked at this time, and if there is a packet waiting on
+ * the queue, the transmission process is begun.
+ *
+ * If a packet is in the queue, it is extracted for the queue as the
+ * next packet to be transmitted by the net device.
+ *
+ * \see TransmitStart ()
+ */
+ void TransmitReadyEvent (void);
+
+ /**
+ * Aborts the transmission of the current packet
+ *
+ * If the net device has tried to transmit a packet for more times
+ * than the maximum allowed number of retries (channel always busy)
+ * then the packet is dropped.
+ */
+ void TransmitAbort (void);
+
+ /**
+ * Notify any interested parties that the link has come up.
+ */
+ void NotifyLinkUp (void);
+
+ /**
+ * Device ID returned by the attached functions. It is used by the
+ * mp-channel to identify each net device to make sure that only
+ * active net devices are writing to the channel
+ */
+ uint32_t m_deviceId;
+
+ /**
+ * Enable net device to send packets. True by default
+ */
+ bool m_sendEnable;
+
+ /**
+ * Enable net device to receive packets. True by default
+ */
+ bool m_receiveEnable;
+
+ /**
+ * Enumeration of the states of the transmit machine of the net device.
+ */
+ enum TxMachineState
+ {
+ READY, /**< The transmitter is ready to begin transmission of a packet */
Vedran Miletić 2012/07/16 12:02:19 Please prefix these with TX_MACHINE_STATE_
+ BUSY, /**< The transmitter is busy transmitting a packet */
+ GAP, /**< The transmitter is in the interframe gap time */
+ BACKOFF /**< The transmitter is waiting for the channel to be free */
+ };
+
+ /**
+ * The state of the Net Device transmit state machine.
+ * \see TxMachineState
+ */
+ TxMachineState m_txMachineState;
+
+ /**
+ * The type of packet that should be created by the AddHeader
+ * function and that should be processed by the ProcessHeader
+ * function.
+ */
+ EncapsulationMode m_encapMode;
+
+ /**
+ * The data rate that the Net Device uses to simulate packet transmission
+ * timing.
+ * \see class DataRate
+ */
+ DataRate m_bps;
+
+ /**
+ * The interframe gap that the Net Device uses insert time between packet
Peter Barnes 2012/07/16 20:08:48 "Device inserts between"
+ * transmission
+ * \see class Time
+ */
+ Time m_tInterframeGap;
+
+ /**
+ * Next packet that will be transmitted (if transmitter is not
+ * currently transmitting) or packet that is currently being
+ * transmitted.
+ */
+ Ptr<Packet> m_currentPkt;
+
+ /**
+ * The SwitchedEthernetChannel to which this SwitchedEthernetNetDevice has been
Peter Barnes 2012/07/16 20:08:48 Break line
+ * attached.
+ * \see class SwitchedEthernetChannel
+ */
+ Ptr<SwitchedEthernetChannel> m_channel;
+
+ /**
+ * The Queue which this SwitchedEthernetNetDevice uses as a packet source.
+ * Management of this Queue has been delegated to the SwitchedEthernetNetDevice
Peter Barnes 2012/07/16 20:08:48 Break line
+ * and it has the responsibility for deletion.
+ * \see class Queue
+ * \see class DropTailQueue
+ */
+ Ptr<Queue> m_queue;
+
+ /**
+ * Error model for receive packet events. When active this model will be
+ * used to model transmission errors by marking some of the packets
+ * received as corrupt.
+ */
+ Ptr<ErrorModel> m_receiveErrorModel;
+
+ /**
+ * The trace source fired when packets come into the "top" of the device
+ * at the L3/L2 transition, before being queued for transmission.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_macTxTrace;
+
+ /**
+ * The trace source fired when packets coming into the "top" of the device
+ * at the L3/L2 transition are dropped before being queued for transmission.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_macTxDropTrace;
+
+ /**
+ * The trace source fired for packets successfully received by the device
+ * immediately before being forwarded up to higher layers (at the L2/L3
+ * transition). This is a promiscuous trace.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_macPromiscRxTrace;
+
+ /**
+ * The trace source fired for packets successfully received by the device
+ * immediately before being forwarded up to higher layers (at the L2/L3
+ * transition). This is a non-promiscuous trace.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_macRxTrace;
+
+ /**
+ * The trace source fired for packets successfully received by the device
+ * but dropped before being forwarded up to higher layers (at the L2/L3
+ * transition).
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_macRxDropTrace;
+
+ /**
+ * The trace source fired when a packet begins the transmission process on
+ * the medium.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyTxBeginTrace;
+
+ /**
+ * The trace source fired when a packet ends the transmission process on
+ * the medium.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyTxEndTrace;
+
+ /**
+ * The trace source fired when the phy layer drops a packet as it tries
+ * to transmit it.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyTxDropTrace;
+
+ /**
+ * The trace source fired when a packet begins the reception process from
+ * the medium.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyRxBeginTrace;
+
+ /**
+ * The trace source fired when a packet ends the reception process from
+ * the medium.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyRxEndTrace;
+
+ /**
+ * The trace source fired when the phy layer drops a packet it has received.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_phyRxDropTrace;
+
+ /**
+ * A trace source that emulates a non-promiscuous protocol sniffer connected
+ * to the device. Unlike your average everyday sniffer, this trace source
+ * will not fire on PACKET_OTHERHOST events.
+ *
+ * On the transmit size, this trace hook will fire after a packet is dequeued
Peter Barnes 2012/07/16 20:08:48 "transmit side,"
+ * from the device queue for transmission. In Linux, for example, this would
+ * correspond to the point just before a device hard_start_xmit where
+ * dev_queue_xmit_nit is called to dispatch the packet to the PF_PACKET
+ * ETH_P_ALL handlers.
+ *
+ * On the receive side, this trace hook will fire when a packet is received,
+ * just before the receive callback is executed. In Linux, for example,
+ * this would correspond to the point at which the packet is dispatched to
+ * packet sniffers in netif_receive_skb.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_snifferTrace;
+
+ /**
+ * A trace source that emulates a promiscuous mode protocol sniffer connected
+ * to the device. This trace source fire on packets destined for any host
Peter Barnes 2012/07/16 20:08:48 "source fires"
+ * just like your average everyday packet sniffer.
+ *
+ * On the transmit size, this trace hook will fire after a packet is dequeued
+ * from the device queue for transmission. In Linux, for example, this would
+ * correspond to the point just before a device hard_start_xmit where
+ * dev_queue_xmit_nit is called to dispatch the packet to the PF_PACKET
+ * ETH_P_ALL handlers.
+ *
+ * On the receive side, this trace hook will fire when a packet is received,
+ * just before the receive callback is executed. In Linux, for example,
+ * this would correspond to the point at which the packet is dispatched to
+ * packet sniffers in netif_receive_skb.
+ *
+ * \see class CallBackTraceSource
+ */
+ TracedCallback<Ptr<const Packet> > m_promiscSnifferTrace;
+
+ /**
+ * The Node to which this device is attached.
+ */
+ Ptr<Node> m_node;
+
+ /**
+ * The MAC address which has been assigned to this device.
+ */
+ Mac48Address m_address;
+
+ /**
+ * The callback used to notify higher layers that a packet has been received.
+ */
+ NetDevice::ReceiveCallback m_rxCallback;
+
+ /**
+ * The callback used to notify higher layers that a packet has been received in promiscuous mode.
Peter Barnes 2012/07/16 20:08:48 Break line
+ */
+ NetDevice::PromiscReceiveCallback m_promiscRxCallback;
+
+ /**
+ * The interface index (really net evice index) that has been assigned to
Peter Barnes 2012/07/16 20:08:48 "net device index"
+ * this network device.
+ */
+ uint32_t m_ifIndex;
+
+ /**
+ * Flag indicating whether or not the link is up. In this case,
+ * whether or not the device is connected to a channel.
+ */
+ bool m_linkUp;
+
+ /**
+ * List of callbacks to fire if the link changes state (up or down).
+ */
+ TracedCallback<> m_linkChangeCallbacks;
+
+ static const uint16_t DEFAULT_MTU = 1500;
+
+ /**
+ * The Maximum Transmission Unit. This corresponds to the maximum
+ * number of bytes that can be transmitted as seen from higher layers.
+ * This corresponds to the 1500 byte MTU size often seen on IP over
+ * Ethernet.
+ */
+ uint32_t m_mtu;
+
+};
+
+}; // namespace ns3
+
+#endif /* SWITCHED_ETHERNET_NET_DEVICE_H */
+

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