/* -*-	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 Computer Systems *	Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory 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: /nfs/jade/vint/CVSROOT/ns-2/mac/mac-802_11.h,v 1.24 2004/04/02 01:00:25 xuanc Exp $ * * Ported from CMU/Monarch's code, nov'98 -Padma. * wireless-mac-802_11.h */#ifndef ns_mac_80211_h#define ns_mac_80211_h// Added by Sushmita to support event tracing (singal@nunki.usc.edu)#include "address.h"#include "ip.h"#include "mac-timers.h"#include "marshall.h"#include <math.h>class EventTrace;#define GET_ETHER_TYPE(x)		GET2BYTE((x))#define SET_ETHER_TYPE(x,y)            {u_int16_t t = (y); STORE2BYTE(x,&t);}/* ======================================================================   Frame Formats   ====================================================================== */#define	MAC_ProtocolVersion	0x00#define MAC_Type_Management	0x00#define MAC_Type_Control	0x01#define MAC_Type_Data		0x02#define MAC_Type_Voice          0x03 //自己加的#define MAC_Type_Reserved	0x04#define MAC_Subtype_RTS		0x0B#define MAC_Subtype_CTS		0x0C#define MAC_Subtype_ACK		0x0D#define MAC_Subtype_Data	0x00#define MAC_Subtype_Voice       0x01 //自己加的struct frame_control {	u_char		fc_subtype		: 5; //由4改為5	u_char		fc_type			: 2;	u_char		fc_protocol_version	: 2;	u_char		fc_order		: 1;	u_char		fc_wep			: 1;	u_char		fc_more_data		: 1;	u_char		fc_pwr_mgt		: 1;	u_char		fc_retry		: 1;	u_char		fc_more_frag		: 1;	u_char		fc_from_ds		: 1;	u_char		fc_to_ds		: 1;};struct rts_frame {	struct frame_control	rf_fc;	u_int16_t		rf_duration;	u_char			rf_ra[ETHER_ADDR_LEN];	u_char			rf_ta[ETHER_ADDR_LEN];	u_char			rf_fcs[ETHER_FCS_LEN];};struct cts_frame {	struct frame_control	cf_fc;	u_int16_t		cf_duration;	u_char			cf_ra[ETHER_ADDR_LEN];	u_char			cf_fcs[ETHER_FCS_LEN];};struct ack_frame {	struct frame_control	af_fc;	u_int16_t		af_duration;	u_char			af_ra[ETHER_ADDR_LEN];	u_char			af_fcs[ETHER_FCS_LEN];};// XXX This header does not have its header access function because it shares// the same header space with hdr_mac.struct hdr_mac802_11 {	struct frame_control	dh_fc;	u_int16_t		dh_duration;	u_char                  dh_ra[ETHER_ADDR_LEN];        u_char                  dh_ta[ETHER_ADDR_LEN];        u_char                  dh_3a[ETHER_ADDR_LEN];	u_int16_t		dh_scontrol;	u_char			dh_body[0]; // XXX Non-ANSI};/* ======================================================================   Definitions   ====================================================================== *//* Must account for propagation delays added by the channel model when * calculating tx timeouts (as set in tcl/lan/ns-mac.tcl). *   -- Gavin Holland, March 2002 */#define DSSS_MaxPropagationDelay        0.000002        // 2us   XXXXclass PHY_MIB {public:	PHY_MIB(Mac802_11 *parent);	inline u_int32_t getCWMin() { return(CWMin); }        inline u_int32_t getCWMax() { return(CWMax); }	inline double getSlotTime() { return(SlotTime); }	inline double getSIFS() { return(SIFSTime); }	inline double getPIFS() { return(SIFSTime + SlotTime); }	inline double getVIFS() { return(SIFSTime + 1.5 * SlotTime;) } //自己加的	inline double getDIFS() { return(SIFSTime + 2 * SlotTime); }	inline double getEIFS() {		// see (802.11-1999, 9.2.10)		return(SIFSTime + getDIFS()                       + (8 *  getACKlen())/PLCPDataRate);	}	inline u_int32_t getPreambleLength() { return(PreambleLength); }	inline double getPLCPDataRate() { return(PLCPDataRate); }		inline u_int32_t getPLCPhdrLen() {		return((PreambleLength + PLCPHeaderLength) >> 3);	}	inline u_int32_t getHdrLen11() {		return(getPLCPhdrLen() + sizeof(struct hdr_mac802_11)                       + ETHER_FCS_LEN);	}		inline u_int32_t getRTSlen() {		return(getPLCPhdrLen() + sizeof(struct rts_frame));	}		inline u_int32_t getCTSlen() {		return(getPLCPhdrLen() + sizeof(struct cts_frame));	}		inline u_int32_t getACKlen() {		return(getPLCPhdrLen() + sizeof(struct ack_frame));	} private:	u_int32_t	CWMin;	u_int32_t	CWMax;	double		SlotTime;	double		SIFSTime;	u_int32_t	PreambleLength;	u_int32_t	PLCPHeaderLength;	double		PLCPDataRate;};/* * IEEE 802.11 Spec, section 11.4.4.2 *      - default values for the MAC Attributes */#define MAC_FragmentationThreshold	2346		// bytes#define MAC_MaxTransmitMSDULifetime	512		// time units#define MAC_MaxReceiveLifetime		512		// time unitsclass MAC_MIB {public:	MAC_MIB(Mac802_11 *parent);private:	u_int32_t	RTSThreshold;	u_int32_t	ShortRetryLimit;	u_int32_t	LongRetryLimit;public:	u_int32_t	FailedCount;		u_int32_t	RTSFailureCount;	u_int32_t	ACKFailureCount; public:       inline u_int32_t getRTSThreshold() { return(RTSThreshold);}       inline u_int32_t getShortRetryLimit() { return(ShortRetryLimit);}       inline u_int32_t getLongRetryLimit() { return(LongRetryLimit);}};/* ======================================================================   The following destination class is used for duplicate detection.   ====================================================================== */class Host {public:	LIST_ENTRY(Host) link;	u_int32_t	index;	u_int32_t	seqno;};/* ======================================================================   The actual 802.11 MAC class.   ====================================================================== */class Mac802_11 : public Mac {	friend class DeferTimer;	friend class BackoffTimer;	friend class IFTimer;	friend class NavTimer;	friend class RxTimer;	friend class TxTimer;public:	Mac802_11();	void		recv(Packet *p, Handler *h);	inline int	hdr_dst(char* hdr, int dst = -2);	inline int	hdr_src(char* hdr, int src = -2);	inline int	hdr_type(char* hdr, u_int16_t type = 0);		inline int bss_id() { return bss_id_; }		// Added by Sushmita to support event tracing        void trace_event(char *, Packet *);        EventTrace *et_;protected:	void	backoffHandler(void);	void	deferHandler(void);	void	navHandler(void);	void	recvHandler(void);	void	sendHandler(void);	void	txHandler(void);private:	int		command(int argc, const char*const* argv);	/*	 * Called by the timers.	 */	void		recv_timer(void);	void		send_timer(void);	int		check_pktCTRL();	int             check_pktVOICE(); //自己加的	int		check_pktRTS();	int		check_pktTx();	/*	 * Packet Transmission Functions.	 */	void	send(Packet *p, Handler *h);	void 	sendRTS(int dst);	void	sendCTS(int dst, double duration);	void	sendACK(int dst);	void	sendDATA(Packet *p);	void    sendVOICE(Packet *p); //自己加的	void	RetransmitRTS();	void	RetransmitDATA();	void    RetransmitVOICE(); //自己加的	/*	 * Packet Reception Functions.	 */	void	recvRTS(Packet *p);	void	recvCTS(Packet *p);	void	recvACK(Packet *p);	void	recvDATA(Packet *p);	void    recvVOICE(Packet *p); //自己加的	void		capture(Packet *p);	void		collision(Packet *p);	void		discard(Packet *p, const char* why);	void		rx_resume(void);	void		tx_resume(void);	inline int	is_idle(void);	/*	 * Debugging Functions.	 */	void		trace_pkt(Packet *p);	void		dump(char* fname);	inline int initialized() {			return (cache_ && logtarget_                        && Mac::initialized());	}	inline void mac_log(Packet *p) {                logtarget_->recv(p, (Handler*) 0);        }	double txtime(Packet *p);	double txtime(double psz, double drt);	double txtime(int bytes) { /* clobber inherited txtime() */ abort(); return 0;}	inline void transmit(Packet *p, double timeout);	inline void checkBackoffTimer(void);	inline void postBackoff(int pri);	inline void setRxState(MacState newState);	inline void setTxState(MacState newState);	inline void inc_cw() {		cw_ = (cw_ << 1) + 1;		if(cw_ > phymib_.getCWMax())			cw_ = phymib_.getCWMax();	}	inline void rst_cw() { cw_ = phymib_.getCWMin(); }	inline double sec(double t) { return(t *= 1.0e-6); }	inline u_int16_t usec(double t) {		u_int16_t us = (u_int16_t)floor((t *= 1e6) + 0.5);		return us;	}	inline void set_nav(u_int16_t us) {		double now = Scheduler::instance().clock();		double t = us * 1e-6;		if((now + t) > nav_) {			nav_ = now + t;			if(mhNav_.busy())				mhNav_.stop();			mhNav_.start(t);		}	}protected:	PHY_MIB         phymib_;        MAC_MIB         macmib_;       /* the macaddr of my AP in BSS mode; for IBSS mode        * this is set to a reserved value IBSS_ID - the        * MAC_BROADCAST reserved value can be used for this        * purpose        */       int     bss_id_;       enum    {IBSS_ID=MAC_BROADCAST};private:	double		basicRate_; 	double		dataRate_; 	double          voiceRate_; //自己加的		/*	 * Mac Timers	 */	IFTimer		mhIF_;		// interface timer	NavTimer	mhNav_;		// NAV timer	RxTimer		mhRecv_;		// incoming packets	TxTimer		mhSend_;		// outgoing packets	DeferTimer	mhDefer_;	// defer timer	BackoffTimer	mhBackoff_;	// backoff timer	/* ============================================================	   Internal MAC State	   ============================================================ */	double		nav_;		// Network Allocation Vector	MacState	rx_state_;	// incoming state (MAC_RECV or MAC_IDLE)	MacState	tx_state_;	// outgoint state	int		tx_active_;	// transmitter is ACTIVE	Packet          *eotPacket_;    // copy for eot callback	Packet		*pktRTS_;	// outgoing RTS packet	Packet		*pktCTRL_;	// outgoing non-RTS packet	Packet          *pktVOICE_;     // outgoing VOICE packet-自己加的	u_int32_t	cw_;		// Contention Window	u_int32_t	ssrc_;		// STA Short Retry Count	u_int32_t	slrc_;		// STA Long Retry Count	int		min_frame_len_;	NsObject*	logtarget_;	NsObject*       EOTtarget_;     // given a copy of packet at TX end	/* ============================================================	   Duplicate Detection state	   ============================================================ */	u_int16_t	sta_seqno_;	// next seqno that I'll use	int		cache_node_count_;	Host		*cache_;};#endif /* __mac_80211_h__ */