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// -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*-
/*
* Copyright (C) 2004-2006 by the University of Southern California,
* Information Sciences Institute
* 2002 by Dina Katabi
* $Id: xcp-end-sys.h,v 1.10 2006/05/30 20:30:30 pradkin Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation, advertising
* materials, and other materials related to such distribution and use
* acknowledge that the software was developed by the University of
* Southern California, Information Sciences Institute. The name of the
* University may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Header: /cvsroot/nsnam/ns-2/xcp/xcp-end-sys.h,v 1.10 2006/05/30 20:30:30 pradkin Exp $
*/
#ifndef ns_xcp_end_sys_h
#define ns_xcp_end_sys_h
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include "ip.h"
#include "tcp.h"
#include "flags.h"
#include "agent.h"
#include "packet.h"
#include "flags.h"
#include "tcp-sink.h"
#include "tcp-full.h"
#define XCP_HDR_LEN 20 // to match the internet draft
struct hdr_xcp {
double x_; //idealized inter-packet time
double rtt_;
enum {
XCP_DISABLED = 0,
XCP_ENABLED,
XCP_ACK,
} xcp_enabled_; // to indicate that the flow is XCP enabled
int xcpId_; // Sender's ID (debugging only)
double cwnd_; // The current window (debugging only)
double reverse_feedback_;
// --- Initialized by source and Updated by Router
double delta_throughput_;
unsigned int controlling_hop_; // The AQM ID of the controlling router
static int offset_; // offset for this header
inline static int& offset() { return offset_; }
inline static hdr_xcp* access(Packet* p) {
return (hdr_xcp*) p->access(offset_);
}
/* per-field member functions */
double& cwnd() { return (cwnd_); }
double& rtt() { return (rtt_); }
};
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define TP_TO_TICKS MAX(1, (t_srtt_ >> T_SRTT_BITS))
#define TP_AVG_EXP 4 // used for xcp_metered_output_ == true
//Base class for Tcp and FullTcp XCP agents
class XcpEndsys {
protected:
XcpEndsys(TcpAgent* tcp);
void trace_var(const char *var_name, double var) const;
void opencwnd() { /* nothing, cwnd is conrolled in recv() */ }
void rtt_update(double tao);
void init_rtt_vars() { srtt_estimate_ = 0.0; }
void rtt_init();
void recv(Packet *);
void send(Packet *, int datalen);
TcpAgent *tcp_;
double xcp_rev_fb_; /* Accumulated throughput change to send back, B/s */
double current_positive_feedback_ ;
int tcpId_;
double srtt_estimate_;
long xcp_srtt_; // srtt estimate using the above macros
/* more bits in delta for better precision, just for SRTT */
#define XCP_DELTA_SHIFT 5
#define XCP_EXPO_SHIFT 3
#define XCP_RTT_SHIFT (XCP_DELTA_SHIFT + XCP_EXPO_SHIFT)
/* macros for SRTT calculations */
#define XCP_INIT_SRTT(rtt) \
((rtt) << XCP_RTT_SHIFT)
#define XCP_UPDATE_SRTT(srtt, rtt) \
((srtt) + (((rtt) << XCP_DELTA_SHIFT) \
- (((srtt) + (1 << (XCP_EXPO_SHIFT - 1))) \
>> XCP_EXPO_SHIFT)))
static unsigned int next_xcp_;
};
class XcpNewRenoFullTcpAgent : public NewRenoFullTcpAgent,
public XcpEndsys {
public:
XcpNewRenoFullTcpAgent();
protected:
/*New*/
virtual void delay_bind_init_all();
virtual int delay_bind_dispatch(const char *varName,
const char *localName,
TclObject *tracer);
/*New*/
virtual void opencwnd() { XcpEndsys::opencwnd(); }
virtual void recv(Packet *, Handler *);
virtual void sendpacket(int seq, int ack, int flags, int dlen, int why, Packet *p=0);
virtual void rtt_init(); // called in reset()
virtual void rtt_update(double);
};
class XcpRenoTcpAgent : public RenoTcpAgent,
public XcpEndsys {
public:
XcpRenoTcpAgent();
protected:
virtual void delay_bind_init_all();
virtual int delay_bind_dispatch(const char *varName,
const char *localName,
TclObject *tracer);
virtual void output_helper(Packet *);
virtual void recv_newack_helper(Packet *);
virtual void opencwnd() { XcpEndsys::opencwnd(); }
virtual void rtt_init(); // called in reset()
virtual void rtt_update(double);
};
class XcpTcpSink : public TcpSink,
public XcpEndsys {
public:
XcpTcpSink(Acker *);
virtual void recv(Packet* pkt, Handler*);
protected:
virtual void add_to_ack(Packet*);
virtual void delay_bind_init_all();
virtual int delay_bind_dispatch(const char *varName,
const char *localName,
TclObject *tracer);
};
#endif /* ns_xcp_end_sys_h */
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