mac-802_11.h

在网络仿真模拟工具下实现MAC层802.11DCF协议

	//		GroupAddresses;
	u_int32_t	RTSThreshold;
	u_int32_t	ShortRetryLimit;
	u_int32_t	LongRetryLimit;
// change wrt Mike's code

//	u_int32_t	FragmentationThreshold;
//	u_int32_t	MaxTransmitMSDULifetime;
//	u_int32_t	MaxReceiveLifetime;
	//		ManufacturerID;
	//		ProductID;

// change wrt Mike's code
public:

//	u_int32_t	TransmittedFragmentCount;
//	u_int32_t	MulticastTransmittedFrameCount;
	u_int32_t	FailedCount;	
//	u_int32_t	RetryCount;
//	u_int32_t	MultipleRetryCount;
//	u_int32_t	FrameDuplicateCount;
//	u_int32_t	RTSSuccessCount;
	u_int32_t	RTSFailureCount;
	u_int32_t	ACKFailureCount;
//	u_int32_t	ReceivedFragmentCount;
//	u_int32_t	MulticastReceivedFrameCount;
//	u_int32_t	FCSErrorCount;

 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;
// change wrt Mike's code
	friend class BeaconTimer;


	friend class BackoffTimer;
	friend class IFTimer;
	friend class NavTimer;
	friend class RxTimer;
	friend class TxTimer;
public:
	// change wrt Mike's code
	Mac802_11();
	//	Mac802_11(PHY_MIB* p, MAC_MIB *m);
	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);
	
	// change wrt Mike's code
	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);
// change wrt Mike's code	
	void    beaconHandler(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_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	RetransmitRTS();
	void	RetransmitDATA();

	/*
	 * Packet Reception Functions.
	 */
	void	recvRTS(Packet *p);
	void	recvCTS(Packet *p);
	void	recvACK(Packet *p);
	void	recvDATA(Packet *p);

	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() {
	
	// change wrt Mike's code
	//	return (phymib_ && macmib_ && cache_ && logtarget_ && 
	//		Mac::initialized());

	return (cache_ && logtarget_
                        && Mac::initialized());

	}

	// change wrt Mike's code
	/*
	void mac_log(Packet *p) {
		logtarget_->recv(p, (Handler*) 0);
	}*/

	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(); }

// change wrt Mike's code
	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;
	// change wrt Mike's code
	//	if(cw_ > phymib_->CWMax)
	//		cw_ = phymib_->CWMax;
	if(cw_ > phymib_.getCWMax())
                       cw_ = phymib_.getCWMax();
	}

// change wrt Mike's code
//	inline void rst_cw() { cw_ = phymib_->CWMin; }
	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);
		/* u_int16_t us = (u_int16_t)rint(t *= 1e6); */
		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:

// change wrt Mike's code
/*
	PHY_MIB		*phymib_;
	MAC_MIB		*macmib_;
*/

	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_;
	
	/*
	 * 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

// change wrt Mike's code
	 BeaconTimer     mhBeacon_;      // to generate beacons



	/* ============================================================
	   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

// change wrt Mike's code
	Packet          *eotPacket_;    // copy for eot callback

	Packet		*pktRTS_;	// outgoing RTS packet
	Packet		*pktCTRL_;	// outgoing non-RTS packet

	u_int32_t	cw_;		// Contention Window
	u_int32_t	ssrc_;		// STA Short Retry Count
	u_int32_t	slrc_;		// STA Long Retry Count
// change wrt Mike's code

 //	double		sifs_;		// Short Interface Space
//	double		pifs_;		// PCF Interframe Space
	double		difs_;		// DCF Interframe Space
	double		eifs_;		// Extended Interframe Space
//	double		tx_sifs_;
//	double		tx_pifs_;
//	double		tx_difs_;

	int		min_frame_len_;

	NsObject*	logtarget_;
// change wrt Mike's code
	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__ */