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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1997 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Daedalus Research
* Group at the University of California Berkeley.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Contributed by the Daedalus Research Group, http://daedalus.cs.berkeley.edu
*
* @(#) $Header: /cvsroot/nsnam/ns-2/tcp/tcp-session.h,v 1.8 1999/09/09 03:25:26 salehi Exp $ (UCB)
*/
#ifndef nc_tcp_session_h
#define ns_tcp_session_h
#include "agent.h"
#include "timer-handler.h"
#include "chost.h"
#define FINE_ROUND_ROBIN 1
#define COARSE_ROUND_ROBIN 2
#define RANDOM 3
class TcpSessionAgent;
class SessionRtxTimer : public TimerHandler {
public:
SessionRtxTimer(TcpSessionAgent *a) : TimerHandler() { a_ = a; }
protected:
virtual void expire(Event *e);
TcpSessionAgent *a_;
};
class SessionResetTimer : public TimerHandler {
public:
SessionResetTimer(TcpSessionAgent *a) : TimerHandler() { a_ = a; }
protected:
virtual void expire(Event *e);
TcpSessionAgent *a_;
};
class SessionBurstSndTimer : public TimerHandler {
public:
SessionBurstSndTimer(TcpSessionAgent *a) : TimerHandler() { a_ = a; }
protected:
virtual void expire(Event *e);
TcpSessionAgent *a_;
};
/*
* This class implements the notion of a TCP session. It integrates congestion
* control and loss detection functionality across the one or more IntTcp
* connections that comprise the session.
*/
class TcpSessionAgent : public CorresHost {
public:
TcpSessionAgent();
int command(int argc, const char*const* argv);
void reset_rtx_timer(int mild, int backoff = 1); /* XXX mild needed ? */
void set_rtx_timer();
void cancel_rtx_timer();
void cancel_timers();
void newack(Packet *pkt);
int fs_pkt();
void rtt_update_exact(double tao);
void timeout(int tno);
virtual Segment* add_pkts(int size, int seqno, int sessionSeqno, int daddr,
int dport, int sport, double ts, IntTcpAgent *sender);
virtual void add_agent(IntTcpAgent *agent, int size, double winMult,
int winInc, int ssthresh);
int window();
void set_weight(IntTcpAgent *tcp, int wt);
void reset_dyn_weights();
IntTcpAgent *who_to_snd(int how);
void send_much(IntTcpAgent *agent, int force, int reason);
void recv(IntTcpAgent *agent, Packet *pkt, int amt_data_acked);
void setflags(Packet *pkt);
int findSessionSeqno(IntTcpAgent *sender, int seqno);
void removeSessionSeqno(int sessionSeqno);
void quench(int how, IntTcpAgent *sender, int seqno);
virtual void traceVar(TracedVar* v);
// inline nsaddr_t& addr() {return addr_;}
// inline nsaddr_t& dst() {return dst_;}
static Islist<TcpSessionAgent> sessionList_;
protected:
SessionRtxTimer rtx_timer_;
SessionBurstSndTimer burstsnd_timer_;
int sessionSeqno_;
double last_send_time_;
Segment *last_seg_sent_;
IntTcpAgent *curConn_;
int numConsecSegs_;
int schedDisp_;
int wtSum_;
int dynWtSum_;
};
#endif
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