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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) @ 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 MASH Research
* Group at the University of California Berkeley.
* 4. Neither the name of the University nor of the Research Group 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.
*
* @(#) $Header: /cvsroot/nsnam/ns-2/tcp/scoreboard-rh.h,v 1.2 2000/08/12 21:46:10 sfloyd Exp $
*/
#ifndef ns_scoreboard_h
#define ns_scoreboard_h
// Definition of the scoreboard class:
#define SBSIZE 1024
#include "tcp.h"
class ScoreBoardRH {
public:
ScoreBoardRH(int *numdupacks) : numdupacks_(numdupacks) {first_=0; length_=0; retran_occured_=0;}
int IsEmpty () {return (length_ == 0);}
void ClearScoreBoard ();
int GetNextRetran ();
void MarkRetran (int retran_seqno, int snd_nxt, int rh_id);
int UpdateScoreBoard (int last_ack_, hdr_tcp*, int rh_id);
int CheckSndNxt (int sack_max);
int GetFack (int last_ack);
int GetNewHoles ();
void TimeoutScoreBoard (int snd_nxt);
int FakeSack (int last_ack, int num_dupacks);
int RetranSacked (int rh_id);
int RetranOccurred (int rh_id) {return (retran_occured_ == rh_id);}
protected:
int first_, length_;
int retran_occured_; /* This variable stores the last adjustment interval
in which a retransmission occured */
int retran_sacked_; /* This variable stores the last adjustment interval
in which a retransmission was sacked */
int *numdupacks_; /* I know, it stinks... But this is numdupacks_ from
* our parent TCP stack. */
struct ScoreBoardNode {
int seq_no_; /* Packet number */
int ack_flag_; /* Acked by cumulative ACK */
int sack_flag_; /* Acked by SACK block */
int retran_; /* Packet retransmitted */
int snd_nxt_; /* snd_nxt at time of retransmission */
int sack_cnt_; /* number of reports for this hole */
int rh_id_; /* The id of the rate-halving adjustment interval */
} SBN[SBSIZE+1];
};
#endif
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