scoreboard-rh.h

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 * @(#) $Header: /nfs/jade/vint/CVSROOT/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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