hdr_qs.h

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/*
 * Copyright (c) 2001 University of Southern California.
 * 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.
 *
 **
 * Quick Start for TCP and IP.
 * A scheme for transport protocols to dynamically determine initial 
 * congestion window size.
 *
 * http://www.ietf.org/internet-drafts/draft-amit-quick-start-02.ps
 *
 * This defines the Quick Start packet header
 * 
 * hdr_qs.h
 *
 * Srikanth Sundarrajan, 2002
 * sundarra@usc.edu
 */

#ifndef _HDR_QS_H
#define _HDR_QS_H

#include <assert.h>
#include <packet.h>

enum QS_STATE { QS_DISABLE, QS_REQUEST, QS_RESPONSE };

struct hdr_qs {
 
        int flag_;      // 1 for request, 0 for response all others invalid     
        int ttl_; 
        int rate_; 

        static int offset_;     // offset for this header 
        inline int& offset() { return offset_; }

        inline static hdr_qs* access(Packet* p) {
                return (hdr_qs*) p->access(offset_);
        }

        int& flag() { return flag_; }
        int& ttl() { return ttl_; }
        int& rate() { return rate_; }

};

#endif

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