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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) 1997 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/common/flags.h,v 1.19 2004/10/28 01:20:10 sfloyd Exp $
*/
/*
* contains a "flags header", which is common to each packet
*/
#ifndef ns_flags_h
#define ns_flags_h
#include "config.h"
#include "packet.h"
struct hdr_flags {
unsigned char ecn_; /* transport receiver notifying
* transport sender of ECN
* (ECN Echo bit in TCP header) */
unsigned char ecn_to_echo_; /* ecn to be echoed back in the *
* opposite direction *
* (CE bit in IP header) */
unsigned char eln_; /* explicit loss notification (snoop) */
unsigned char fs_; /* tcp fast start (work in progress --venkat) */
unsigned char no_ts_; /* don't use the tstamp of this pkt for rtt */
unsigned char pri_; /* unused */
unsigned char ecn_capable_; /* an ecn-capable tranport *
* (ECT bit in IP header) */
unsigned char cong_action_; /* Congestion Action. Transport
* sender notifying transport
* receiver of responses to congestion.
* (CWR bit in TCP header) */
unsigned char qs_; /* Packet is from Quick-Start window, i.e.
* a window following an approved QS request.
*/
/*
* these functions use the newer ECN names but leaves the actual field
* names above to maintain backward compat
*/
unsigned char& ect() { return ecn_capable_; }
/* (ECT bit in IP header) */
unsigned char& ecnecho() { return ecn_; }
/* (ECN Echo bit in TCP header) */
unsigned char& ce() { return ecn_to_echo_; }
/* (CE bit in IP header) */
unsigned char& cong_action() { return cong_action_; }
/* (CWR bit in TCP header-old name) */
unsigned char& cwr() { return cong_action_; }
/* (CWR bit in TCP header) */
unsigned char& qs() { return qs_; } /* Quick-Start packet */
static int offset_;
inline static int& offset() { return offset_; }
inline static hdr_flags* access(const Packet* p) {
return (hdr_flags*) p->access(offset_);
}
};
#endif
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