#include <TCPConnection.h>

Inheritance diagram for TCPStateVariables:

Public Member Functions
	TCPStateVariables ()
virtual std::string	info () const
virtual std::string	detailedInfo () const
Public Attributes
bool	active
bool	fork
uint32	snd_mss
uint32	snd_una
uint32	snd_nxt
uint32	snd_max
uint32	snd_wnd
uint32	snd_up
uint32	snd_wl1
uint32	snd_wl2
uint32	iss
uint32	rcv_nxt
uint32	rcv_wnd
uint32	rcv_up
uint32	irs
uint32	rcv_adv
int	syn_rexmit_count
simtime_t	syn_rexmit_timeout
bool	fin_ack_rcvd
bool	send_fin
uint32	snd_fin_seq
bool	fin_rcvd
uint32	rcv_fin_seq
uint32	sentBytes
bool	nagle_enabled
bool	delayed_acks_enabled
bool	limited_transmit_enabled
bool	increased_IW_enabled
uint32	full_sized_segment_counter
bool	ack_now
bool	afterRto
bool	ws_support
bool	ws_enabled
bool	snd_ws
bool	rcv_ws
uint	rcv_wnd_scale
uint	snd_wnd_scale
bool	ts_support
bool	ts_enabled
bool	snd_initial_ts
bool	rcv_initial_ts
uint32	ts_recent
uint32	last_ack_sent
simtime_t	time_last_data_sent
bool	sack_support
bool	sack_enabled
bool	snd_sack_perm
bool	rcv_sack_perm
uint32	start_seqno
uint32	end_seqno
bool	snd_sack
bool	snd_dsack
Sack	sacks_array [MAX_SACK_BLOCKS]
uint32	highRxt
uint32	pipe
uint32	recoveryPoint
uint32	sackedBytes
uint32	sackedBytes_old
bool	lossRecovery
uint32	dupacks
uint32	snd_sacks
uint32	rcv_sacks
uint32	rcv_oooseg
uint32	maxRcvBuffer
uint32	usedRcvBuffer
uint32	freeRcvBuffer
uint32	tcpRcvQueueDrops

Detailed Description

Contains state variables ("TCB") for TCP.

TCPStateVariables is effectively a "struct" -- it only contains public data members. (Only declared as a class so that we can use cPolymorphic as base class and make it possible to inspect it in Tkenv.)

TCPStateVariables only contains variables needed to implement the "base" (RFC 793) TCP. More advanced TCP variants are encapsulated into TCPAlgorithm subclasses which can have their own state blocks, subclassed from TCPStateVariables. See TCPAlgorithm::createStateVariables().

Definition at line 144 of file TCPConnection.h.

Constructor & Destructor Documentation

TCPStateVariables::TCPStateVariables ( )

Definition at line 32 of file TCPConnectionBase.cc.

{
    // set everything to 0 -- real init values will be set manually
    active = false;
    fork = false;
    snd_mss = 0; // will initially be set from configureStateVariables() and probably reset during connection setup
    snd_una = 0;
    snd_nxt = 0;
    snd_max = 0;
    snd_wnd = 0;
    snd_up = 0;
    snd_wl1 = 0;
    snd_wl2 = 0;
    iss = 0;

    rcv_nxt = 0;
    rcv_wnd = 0; // will be set from configureStateVariables()
    rcv_up = 0;
    irs = 0;
    rcv_adv = 0; // will be set from configureStateVariables()

    syn_rexmit_count = 0;
    syn_rexmit_timeout = 0;

    fin_ack_rcvd = false;
    send_fin = false;
    snd_fin_seq = 0;
    fin_rcvd = false;
    rcv_fin_seq = 0;
    sentBytes = 0;

    nagle_enabled = false;      // will be set from configureStateVariables()
    delayed_acks_enabled = false; // will be set from configureStateVariables()
    limited_transmit_enabled = false; // will be set from configureStateVariables()
    increased_IW_enabled = false; // will be set from configureStateVariables()
    full_sized_segment_counter = 0;
    ack_now = false;

    afterRto = false;

    time_last_data_sent = 0;

    ws_support = false;       // will be set from configureStateVariables()
    ws_enabled = false;
    snd_ws = false;
    rcv_ws = false;
    rcv_wnd_scale = 0;        // will be set from configureStateVariables()
    snd_wnd_scale = 0;      

    ts_support = false;       // will be set from configureStateVariables()
    ts_enabled = false;
    snd_initial_ts = false;
    rcv_initial_ts = false;
    ts_recent = 0;
    last_ack_sent = 0;

    sack_support = false;       // will be set from configureStateVariables()
    sack_enabled = false;
    snd_sack_perm = false;
    rcv_sack_perm = false;

    snd_sack = false;
    snd_dsack = false;
    start_seqno = 0;
    end_seqno = 0;
    highRxt = 0;
    pipe = 0;
    recoveryPoint = 0;
    sackedBytes = 0;
    sackedBytes_old = 0;
    lossRecovery = false;

    dupacks = 0;
    snd_sacks = 0;
    rcv_sacks = 0;
    rcv_oooseg = 0;

    maxRcvBuffer  = 0;  // will be set from configureStateVariables()
    usedRcvBuffer = 0;
    freeRcvBuffer = 0;
    tcpRcvQueueDrops = 0;
}

Member Function Documentation

std::string TCPStateVariables::detailedInfo ( void ) const [virtual]

Reimplemented in TCPBaseAlgStateVariables, and TCPTahoeRenoFamilyStateVariables.

Definition at line 127 of file TCPConnectionBase.cc.

{
    std::stringstream out;
    out << "active = " << active << "\n";
    out << "snd_mss = " << snd_mss << "\n";
    out << "snd_una = " << snd_una << "\n";
    out << "snd_nxt = " << snd_nxt << "\n";
    out << "snd_max = " << snd_max << "\n";
    out << "snd_wnd = " << snd_wnd << "\n";
    out << "snd_up = " << snd_up << "\n";
    out << "snd_wl1 = " << snd_wl1 << "\n";
    out << "snd_wl2 = " << snd_wl2 << "\n";
    out << "iss = " << iss << "\n";
    out << "rcv_nxt = " << rcv_nxt << "\n";
    out << "rcv_wnd = " << rcv_wnd << "\n";
    out << "rcv_up = " << rcv_up << "\n";
    out << "irs = " << irs << "\n";
    out << "rcv_adv = " << rcv_adv << "\n";
    out << "fin_ack_rcvd = " << fin_ack_rcvd << "\n";
    out << "nagle_enabled = " << nagle_enabled << "\n";
    out << "limited_transmit_enabled = " << limited_transmit_enabled << "\n";
    out << "increased_IW_enabled = " << increased_IW_enabled << "\n";
    out << "delayed_acks_enabled = " << delayed_acks_enabled << "\n";
    out << "ws_support = " << ws_support << "\n";
    out << "ws_enabled = " << ws_enabled << "\n";
    out << "ts_support = " << ts_support << "\n";
    out << "ts_enabled = " << ts_enabled << "\n";
    out << "sack_support = " << sack_support << "\n";
    out << "sack_enabled = " << sack_enabled << "\n";
    out << "snd_sack_perm = " << snd_sack_perm << "\n";
    out << "snd_sacks = " << snd_sacks << "\n";
    out << "rcv_sacks = " << rcv_sacks << "\n";
    out << "dupacks = " << dupacks << "\n";
    out << "rcv_oooseg = " << rcv_oooseg << "\n";
    return out.str();
}

std::string TCPStateVariables::info ( ) const [virtual]

Reimplemented in TCPBaseAlgStateVariables, and TCPTahoeRenoFamilyStateVariables.

Definition at line 115 of file TCPConnectionBase.cc.

Referenced by TCPConnection::process_RCV_SEGMENT().

{
    std::stringstream out;
    out <<  "snd_una=" << snd_una;
    out << " snd_nxt=" << snd_nxt;
    out << " snd_max=" << snd_max;
    out << " snd_wnd=" << snd_wnd;
    out << " rcv_nxt=" << rcv_nxt;
    out << " rcv_wnd=" << rcv_wnd;
    return out.str();
}