net.clackrouter.component.tcp
Class TCB

java.lang.Object
  net.clackrouter.component.base.ClackComponent
      net.clackrouter.component.tcp.TCB

All Implemented Interfaces:

Alarm

public class TCB
extends ClackComponent

A Transmission Control Block (TCB) represents the state of a single TCP connection.

One TCB exists per (src address, source port, destination address, destination port) tuple. The relationship between TCBs and sockets is one-to-one, though it is a bit confusing in the case of server sockets, since a TCB exists despite the fact that no data is actually ever sent over a server socket.

Nested Class Summary

Nested classes/interfaces inherited from class net.clackrouter.component.base.ClackComponent

ClackComponent.Waiter

Field Summary

static long	CLOSE_WAIT_MILLIS
int	connection_state
boolean	done
long	fin_seq_sent
boolean	finReceived
long	initial_sequence_num
java.net.InetAddress	local_address
int	local_port
static int	MAX_PAYLOAD
static int	MAX_WINDOW
long	mCloseWaitStart
ClackComponentEvent	mDataChangeEvent
OrderPackets	mOrderPackets
TCP	mParent
ProcessAck	mProcessAck
ProcessSegment	mProcessSegment
SockBuffer	mRecvBuffer
ReceiveWindowCheck	mRecvWinCheck
Retransmitter	mRetransmitter
SockBuffer	mSendBuffer
SendWindowCheck	mSendWinCheck
SetChecksum	mSetChecksum
TCPSocket	mSocket
ValidateChecksum	mValidateChecksum
static int	NUM_PORTS
static int	PORT_FROM_NET
static int	PORT_INTERNAL_FROM_NET
static int	PORT_INTERNAL_TO_NET
static int	PORT_TO_NET
long	recv_nxt
java.net.InetAddress	remote_address
int	remote_port
long	rto_msec
static int	RTO_MSECS
long	send_nxt
long	send_una
int	send_window
static int	STATE_CLOSE_WAIT
static int	STATE_CLOSED
static int	STATE_CLOSING
static int	STATE_ESTABLISHED
static int	STATE_FIN_WAIT1
static int	STATE_FIN_WAIT2
static int	STATE_LAST_ACK
static int	STATE_LISTEN
static int	STATE_SYN_RECEIVED
static int	STATE_SYN_SENT
static int	STATE_TIME_WAIT
static int	STATE_UNKNOWN
static int	TOTAL_RETRANS_ATTEMPTS

Fields inherited from class net.clackrouter.component.base.ClackComponent

componentCell, m_has_error, m_log, m_name, m_num_ports, m_packetcount_in, m_packetcount_out, m_ports, mListeners, mRouter, pendingError, SIGNAL_ERROR_LEN_MSEC, UNIQUE_COUNT, view

Constructor Summary

TCB(TCP parent, Router router, java.lang.String name)

Method Summary

void	acceptPacket(VNSPacket packet, int port_num) The starting point for packet-processing when packets are "pushed" to this component.
void	connect_no_gui() Method to connect all TCP subcomponents for this TCB.
static java.lang.String	getStateString(int state) Conveniance method to get a string value representing a TCP state integer value.
void	initiateConnection(java.net.InetAddress r_addr, int r_port) Used to start a client connection to a remote host/port pair.
void	notifySynReceived(VNSTCPPacket packet) Initializes the state of a TCB for a server port based on the contents of a newly received SYN packet.
protected void	setupPorts(int numports) Allocates an array of ClackPort objects to be used by this component

Methods inherited from class net.clackrouter.component.base.ClackComponent

createCopy, createInputPullPort, createInputPushPort, createOutputPullPort, createOutputPushPort, error, fireListeners, getColor, getComponentCell, getHierarchicalView, getLog, getName, getNumPorts, getPacketCountIn, getPacketCountOut, getPendingError, getPort, getPropertiesView, getRouter, getSerializableProperties, getTime, getTypeName, getUniqueCount, getView, handlePullRequest, hasError, initializeProperties, isHierarchical, isModifying, log, notifyAlarm, poll, registerListener, sendOutPort, setAlarm, setComponentCell, setName, setPendingError, setView, showErrorDialog, signalError, try_repaint, unregisterListener

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

STATE_CLOSED

public static final int STATE_CLOSED

See Also:

Constant Field Values

STATE_LISTEN

public static final int STATE_LISTEN

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Constant Field Values

STATE_SYN_SENT

public static final int STATE_SYN_SENT

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Constant Field Values

STATE_SYN_RECEIVED

public static final int STATE_SYN_RECEIVED

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Constant Field Values

STATE_ESTABLISHED

public static final int STATE_ESTABLISHED

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Constant Field Values

STATE_FIN_WAIT1

public static final int STATE_FIN_WAIT1

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Constant Field Values

STATE_FIN_WAIT2

public static final int STATE_FIN_WAIT2

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Constant Field Values

STATE_CLOSE_WAIT

public static final int STATE_CLOSE_WAIT

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Constant Field Values

STATE_CLOSING

public static final int STATE_CLOSING

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Constant Field Values

STATE_LAST_ACK

public static final int STATE_LAST_ACK

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Constant Field Values

STATE_TIME_WAIT

public static final int STATE_TIME_WAIT

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Constant Field Values

STATE_UNKNOWN

public static final int STATE_UNKNOWN

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Constant Field Values

RTO_MSECS

public static final int RTO_MSECS

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Constant Field Values

MAX_WINDOW

public static final int MAX_WINDOW

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Constant Field Values

MAX_PAYLOAD

public static final int MAX_PAYLOAD

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Constant Field Values

TOTAL_RETRANS_ATTEMPTS

public static final int TOTAL_RETRANS_ATTEMPTS

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Constant Field Values

connection_state

public int connection_state

send_nxt

public long send_nxt

recv_nxt

public long recv_nxt

send_una

public long send_una

send_window

public int send_window

fin_seq_sent

public long fin_seq_sent

initial_sequence_num

public long initial_sequence_num

finReceived

public boolean finReceived

rto_msec

public long rto_msec

done

public boolean done

mCloseWaitStart

public long mCloseWaitStart

CLOSE_WAIT_MILLIS

public static final long CLOSE_WAIT_MILLIS

See Also:

Constant Field Values

local_port

public int local_port

remote_port

public int remote_port

local_address

public java.net.InetAddress local_address

remote_address

public java.net.InetAddress remote_address

mParent

public TCP mParent

PORT_FROM_NET

public static int PORT_FROM_NET

PORT_TO_NET

public static int PORT_TO_NET

PORT_INTERNAL_FROM_NET

public static int PORT_INTERNAL_FROM_NET

PORT_INTERNAL_TO_NET

public static int PORT_INTERNAL_TO_NET

NUM_PORTS

public static int NUM_PORTS

mSocket

public TCPSocket mSocket

mOrderPackets

public OrderPackets mOrderPackets

mProcessAck

public ProcessAck mProcessAck

mProcessSegment

public ProcessSegment mProcessSegment

mRecvWinCheck

public ReceiveWindowCheck mRecvWinCheck

mRetransmitter

public Retransmitter mRetransmitter

mSendWinCheck

public SendWindowCheck mSendWinCheck

mSetChecksum

public SetChecksum mSetChecksum

mValidateChecksum

public ValidateChecksum mValidateChecksum

mSendBuffer

public SockBuffer mSendBuffer

mRecvBuffer

public SockBuffer mRecvBuffer

mDataChangeEvent

public ClackComponentEvent mDataChangeEvent

Constructor Detail

TCB

public TCB(TCP parent,
           Router router,
           java.lang.String name)

Method Detail

connect_no_gui

public void connect_no_gui()

Method to connect all TCP subcomponents for this TCB.

These components are usually connected in HierarchicalComponent, but that is only if we are using the GUI. For testing, we may want to connect them using this method.

acceptPacket

public void acceptPacket(VNSPacket packet,
                         int port_num)

Description copied from class: ClackComponent

The starting point for packet-processing when packets are "pushed" to this component.

The default implementation warns that the packet is being ignored.

Overrides:

acceptPacket in class ClackComponent

Parameters:

packet - The pushed packet

port_num - The number of the port that this packet is arriving on

initiateConnection

public void initiateConnection(java.net.InetAddress r_addr,
                               int r_port)

Used to start a client connection to a remote host/port pair.

Parameters:

r_addr -

r_port -

setupPorts

protected void setupPorts(int numports)

Description copied from class: ClackComponent

Allocates an array of ClackPort objects to be used by this component

Overrides:

setupPorts in class ClackComponent

Parameters:

numports - the number of ports to create

getStateString

public static java.lang.String getStateString(int state)

Conveniance method to get a string value representing a TCP state integer value.

Parameters:

state -

notifySynReceived

public void notifySynReceived(VNSTCPPacket packet)

Initializes the state of a TCB for a server port based on the contents of a newly received SYN packet.

This TCB is the result of an accept() call on a server socket, creating a new child socket.

Parameters:

packet -