tcp-session.h

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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
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * 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: /nfs/jade/vint/CVSROOT/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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