tcp-asym.h

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 * $Header: /nfs/jade/vint/CVSROOT/ns-2/tcp/tcp-asym.h,v 1.4 2000/09/01 03:04:07 haoboy Exp $
 */

#ifndef ns_tcp_asym_h
#define ns_tcp_asym_h
#include "tcp.h"
#include "ip.h"
#include "flags.h"
#include "random.h"
#include "template.h"

/* 
 * The TCP asym header. The sender includes information that the receiver could
 * use to decide by how much to delay acks.
 * XXXX some of the fields may not be needed
 */ 
struct hdr_tcpasym {
    int ackcount_;          /* the number of segments this ack represents */
    int win_;               /* the amount of window remaining */
    int highest_ack_;       /* the highest ack seen */
    int max_left_to_send_;  /* the max. amount of data that remains to be sent */

    static int offset_; // offset for this header
    inline static int& offset() { return offset_; }
    inline static hdr_tcpasym* access(const Packet* p) {
        return (hdr_tcpasym*) p->access(offset_);
    }

    int& ackcount() { return (ackcount_); }
    int& win() { return (win_); }
    int& highest_ack() { return (highest_ack_); }
    int& max_left_to_send() { return (max_left_to_send_); }
};


/* TCP Asym with Tahoe */
class TcpAsymAgent : public virtual TcpAgent {
public:
    TcpAsymAgent();

    /* helper functions */
    virtual void output_helper(Packet* p);
    virtual void send_helper(int maxburst);
    virtual void recv_helper(Packet* p);
    virtual void recv_newack_helper(Packet* pkt);
    virtual void traceAll();
    virtual void traceVar(TracedVar* v);
protected:
    int ecn_to_echo_;
    TracedDouble t_exact_srtt_;
/*  TracedDouble avg_win_; */
    double g_;      /* gain used for exact_srtt_ smoothing */
    int damp_;
};

/* TCP Asym with Reno */
class TcpRenoAsymAgent : public RenoTcpAgent,
             public TcpAsymAgent {
public:
     TcpRenoAsymAgent() : RenoTcpAgent(), TcpAsymAgent() { }

    /* helper functions */
    virtual void output_helper(Packet* p) { TcpAsymAgent::output_helper(p); }
    virtual void send_helper(int maxburst) { TcpAsymAgent::send_helper(maxburst); }
    virtual void recv_helper(Packet* p) { TcpAsymAgent::recv_helper(p); }
    virtual void recv_newack_helper(Packet* pkt) { TcpAsymAgent::recv_newack_helper(pkt); }

};

/* TCP Asym with New Reno */
class NewRenoTcpAsymAgent : public virtual NewRenoTcpAgent,
                public TcpAsymAgent {
public:
     NewRenoTcpAsymAgent() : NewRenoTcpAgent(), TcpAsymAgent() { }

    /* helper functions */
    virtual void output_helper(Packet* p) { TcpAsymAgent::output_helper(p); }
    virtual void send_helper(int maxburst) { TcpAsymAgent::send_helper(maxburst); }
    virtual void recv_helper(Packet* p) { TcpAsymAgent::recv_helper(p); }
    virtual void recv_newack_helper(Packet* pkt) { TcpAsymAgent::recv_newack_helper(pkt); }

};

#endif

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