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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.
*
*/
/* 8/02 Tom Kelly - Made scoreboard a general interface to allow
* easy swapping of scoreboard algorithms.
* - Allow scoreboard buffer size to grow dynamically
* - Made ScoreBoardNode a more compact data structure
*/
#ifndef ns_scoreboard_h
#define ns_scoreboard_h
// Definition of the scoreboard class:
#include "tcp.h"
class ScoreBoardNode {
public:
int seq_no_; /* Packet number */
char ack_flag_; /* Acked by cumulative ACK */
char sack_flag_; /* Acked by SACK block */
char retran_; /* Packet retransmitted */
int snd_nxt_; /* snd_nxt at time of retransmission */
};
class ScoreBoard {
public:
ScoreBoard(ScoreBoardNode* sbn, int sz): first_(0), length_(0), sbsize_(sz), changed_(0),SBN(sbn) {}
virtual ~ScoreBoard(){if(SBN) delete[] SBN;}
virtual int IsEmpty () {return (length_ == 0);}
virtual void ClearScoreBoard ();
virtual int GetNextRetran ();
virtual void Dump();
virtual void MarkRetran (int retran_seqno);
virtual void MarkRetran (int retran_seqno, int snd_nxt);
virtual int UpdateScoreBoard (int last_ack_, hdr_tcp*);
virtual int CheckUpdate() {return (changed_);}
virtual int CheckSndNxt (hdr_tcp*);
virtual int GetNextUnacked (int seqno);
inline int IsChanged() { return changed_; }
protected:
int first_, length_, sbsize_, changed_;
ScoreBoardNode * SBN;
void resizeSB(int sz);
};
#endif
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