inet::tcp::TCPNoCongestionControl Class Reference

TCP with no congestion control (i.e. More...

#include <TCPNoCongestionControl.h>

Inheritance diagram for inet::tcp::TCPNoCongestionControl:

Public Member Functions
	TCPNoCongestionControl ()
	Ctor. More...
virtual void	initialize () override
	Initialize state vars. More...
virtual void	receivedDataAck (uint32 firstSeqAcked) override
	Redefine what should happen when data got acked, to add congestion window management. More...
Public Member Functions inherited from inet::tcp::TCPBaseAlg
	TCPBaseAlg ()
	Ctor. More...
virtual	~TCPBaseAlg ()
	Virtual dtor. More...
virtual void	established (bool active) override
	Called when the connection is going to ESTABLISHED from SYN_SENT or SYN_RCVD. More...
virtual void	connectionClosed () override
	Called when the connection closes, it should cancel all running timers. More...
virtual void	processTimer (cMessage *timer, TCPEventCode &event) override
	Process REXMIT, PERSIST, DELAYED-ACK and KEEP-ALIVE timers. More...
virtual void	sendCommandInvoked () override
	Called after user sent TCP_C_SEND command to us. More...
virtual void	receivedOutOfOrderSegment () override
	Called after receiving data which are in the window, but not at its left edge (seq != rcv_nxt). More...
virtual void	receiveSeqChanged () override
	Called after rcv_nxt got advanced, either because we received in-sequence data ("text" in RFC 793 lingo) or a FIN. More...
virtual void	receivedDuplicateAck () override
	Called after we received a duplicate ACK (that is: ackNo == snd_una, no data in segment, segment doesn't carry window update, and also, we have unacked data). More...
virtual void	receivedAckForDataNotYetSent (uint32 seq) override
	Called after we received an ACK for data not yet sent. More...
virtual void	ackSent () override
	Called after we sent an ACK. More...
virtual void	dataSent (uint32 fromseq) override
	Called after we sent data. More...
virtual void	segmentRetransmitted (uint32 fromseq, uint32 toseq) override
	Called after we retransmitted segment. More...
virtual void	restartRexmitTimer () override
	Restart REXMIT timer. More...
Public Member Functions inherited from inet::tcp::TCPAlgorithm
	TCPAlgorithm ()
	Ctor. More...
virtual	~TCPAlgorithm ()
	Virtual dtor. More...
void	setConnection (TCPConnection *_conn)
	Assign this object to a TCPConnection. More...
TCPStateVariables *	getStateVariables ()
	Creates and returns the TCP state variables. More...

Protected Member Functions
virtual TCPStateVariables *	createStateVariables () override
	Create and return a TCPNoCongestionControlStateVariables object. More...
virtual void	processRexmitTimer (TCPEventCode &event) override
	Redefine what should happen on retransmission. More...
Protected Member Functions inherited from inet::tcp::TCPBaseAlg
virtual void	startRexmitTimer ()
	Start REXMIT timer and initialize retransmission variables. More...
virtual void	rttMeasurementComplete (simtime_t tSent, simtime_t tAcked)
	Update state vars with new measured RTT value. More...
virtual void	rttMeasurementCompleteUsingTS (uint32 echoedTS) override
	Converting uint32 echoedTS to simtime_t and calling rttMeasurementComplete() to update state vars with new measured RTT value. More...
virtual bool	sendData (bool sendCommandInvoked)
	Send data, observing Nagle's algorithm and congestion window. More...
cMessage *	cancelEvent (cMessage *msg)
	Utility function. More...
virtual void	processPersistTimer (TCPEventCode &event)
virtual void	processDelayedAckTimer (TCPEventCode &event)
virtual void	processKeepAliveTimer (TCPEventCode &event)

Protected Attributes
TCPNoCongestionControlStateVariables *&	state
Protected Attributes inherited from inet::tcp::TCPBaseAlg
TCPBaseAlgStateVariables *&	state
cMessage *	rexmitTimer
cMessage *	persistTimer
cMessage *	delayedAckTimer
cMessage *	keepAliveTimer
cOutVector *	cwndVector
cOutVector *	ssthreshVector
cOutVector *	rttVector
cOutVector *	srttVector
cOutVector *	rttvarVector
cOutVector *	rtoVector
cOutVector *	numRtosVector
Protected Attributes inherited from inet::tcp::TCPAlgorithm
TCPConnection *	conn
TCPStateVariables *	state

Detailed Description

TCP with no congestion control (i.e.

congestion window kept very large). Can be used to demonstrate effect of lack of congestion control.

Constructor & Destructor Documentation

inet::tcp::TCPNoCongestionControl::TCPNoCongestionControl

(

)

Ctor.

                                               : TCPBaseAlg(),
    state((TCPNoCongestionControlStateVariables *&)TCPAlgorithm::state)
{
}

Member Function Documentation

virtual TCPStateVariables* inet::tcp::TCPNoCongestionControl::createStateVariables ( )

inlineoverrideprotectedvirtual

Create and return a TCPNoCongestionControlStateVariables object.

Implements inet::tcp::TCPAlgorithm.

    {
        return new TCPNoCongestionControlStateVariables();
    }

void inet::tcp::TCPNoCongestionControl::initialize ( )

overridevirtual

Initialize state vars.

Reimplemented from inet::tcp::TCPBaseAlg.

{
    TCPBaseAlg::initialize();

    // set congestion window to a practically infinite value
    state->snd_cwnd = 0x7fffffff;
}

void inet::tcp::TCPNoCongestionControl::processRexmitTimer ( TCPEventCode &  event )

overrideprotectedvirtual

Redefine what should happen on retransmission.

Reimplemented from inet::tcp::TCPBaseAlg.

{
    TCPBaseAlg::processRexmitTimer(event);

    if (event == TCP_E_ABORT)
        return;

    // Tahoe-style retransmission: only one segment
    conn->retransmitOneSegment(true);
}

void inet::tcp::TCPNoCongestionControl::receivedDataAck ( uint32  firstSeqAcked )

overridevirtual

Redefine what should happen when data got acked, to add congestion window management.

Reimplemented from inet::tcp::TCPBaseAlg.

{
    TCPBaseAlg::receivedDataAck(firstSeqAcked);

    // ack may have freed up some room in the window, try sending
    sendData(false);
}

Member Data Documentation

TCPNoCongestionControlStateVariables*& inet::tcp::TCPNoCongestionControl::state

protected

Referenced by initialize().

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The documentation for this class was generated from the following files:

• TCPNoCongestionControl.h
• TCPNoCongestionControl.cc