/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- *//* * Copyright (c) 1991-1997 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 Computer Systems *	Engineering Group at Lawrence Berkeley Laboratory. * 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. * */ #ifndef ns_tcpsink_h#define ns_tcpsink_h#include <math.h>#include "agent.h"#include "tcp.h"/* max window size */// #define MWS 1024  #define MWS 64#define MWM (MWS-1)#define HS_MWS 65536#define HS_MWM (MWS-1)/* For Tahoe TCP, the "window" parameter, representing the receiver's * advertised window, should be less than MWM.  For Reno TCP, the * "window" parameter should be less than MWM/2. */class TcpSink;class Acker {public:	Acker();	virtual ~Acker() { delete[] seen_; }	void update_ts(int seqno, double ts, int rfc1323 = 0);	int update(int seqno, int numBytes);	void update_ecn_unacked(int value);	inline int Seqno() const { return (next_ - 1); }	virtual void append_ack(hdr_cmn*, hdr_tcp*, int oldSeqno) const;	void reset();	double ts_to_echo() { return ts_to_echo_;}	int ecn_unacked() { return ecn_unacked_;}	inline int Maxseen() const { return (maxseen_); }	void resize_buffers(int sz);  // resize the seen_ bufferprotected:	int next_;		/* next packet expected */	int maxseen_;		/* max packet number seen */	int wndmask_;		/* window mask - either MWM or HS_MWM - Sylvia */ 	int ecn_unacked_;	/* ECN forwarded to sender, but not yet				 * acknowledged. */	int *seen_;		/* array of packets seen */	double ts_to_echo_;	/* timestamp to echo to peer */	int is_dup_;		// A duplicate packet.public:        int last_ack_sent_;     // For updating timestamps, from Andrei Gurtov.};// derive Sacker from TclObject to allow for traced variableclass SackStack;class Sacker : public Acker, public TclObject {public: 	Sacker() : base_nblocks_(-1), sf_(0) { };	~Sacker();	void append_ack(hdr_cmn*, hdr_tcp*, int oldSeqno) const;	void reset();	void configure(TcpSink*);protected:	int base_nblocks_;	int* dsacks_;		// Generate DSACK blocks.	SackStack *sf_;	void trace(TracedVar*);};class TcpSink : public Agent {public:	TcpSink(Acker*);	void recv(Packet* pkt, Handler*);	void reset();	int command(int argc, const char*const* argv);	TracedInt& maxsackblocks() { return max_sack_blocks_; }protected:	void ack(Packet*);	virtual void add_to_ack(Packet* pkt);        virtual void delay_bind_init_all();        virtual int delay_bind_dispatch(const char *varName, const char *localName, TclObject *tracer);	Acker* acker_;	int ts_echo_bugfix_;	int ts_echo_rfc1323_; 	// conforms to rfc1323 for timestamps echo				// Added by Andrei Gurtov	friend void Sacker::configure(TcpSink*);	TracedInt max_sack_blocks_;	/* used only by sack sinks */	Packet* save_;		/* place to stash saved packet while delaying */				/* used by DelAckSink */	int generate_dsacks_;	// used only by sack sinks	int qs_enabled_; // to enable QuickStart 	int RFC2581_immediate_ack_;	// Used to generate ACKs immediately 	int bytes_;  	// for JOBS					// for RFC2581-compliant gap-filling.	double lastreset_; 	/* W.N. used for detecting packets  */				/* from previous incarnations */};class DelAckSink;class DelayTimer : public TimerHandler {public:	DelayTimer(DelAckSink *a) : TimerHandler() { a_ = a; }protected:	virtual void expire(Event *e);	DelAckSink *a_;};class DelAckSink : public TcpSink {public:	DelAckSink(Acker* acker);	void recv(Packet* pkt, Handler*);	virtual void timeout(int tno);	void reset();protected:	double interval_;	DelayTimer delay_timer_;};#endif