rlc.h

一个很好的LINUX底下的GPRS协议栈

/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */

/* By Sandeep Kumar, Kopparapu Suman and Richa Jain,
 * Indian Institute of Technology, Bombay.
 * June, 2001.
*/ 

/* Copyright (c) 2001 Indian Insitute of Technology, Bombay.  
 * 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 and binary code must contain
 * the above copyright notice, this list of conditions and the following 
 * disclaimer.
 * 
 * 2. All advertising materials mentioning features or use of this software
 * must display the following acknowledgement: 
 * This product includes software developed at Indian Insitute of
 * Technology, Bombay. 
 *
 * 3. The name of the Institute may not be used to endorse or promote 
 * products derived from this software without specific prior written 
 * permission.
 * INDIAN INSTITUTE OF TECHNOLOGY, BOMBAY, MAKES NO REPRESENTATIONS 
 * CONCERNING EITHER THE MERCHANTABILITY OF THIS SOFTWARE OR THE 
 * SUITABILITY OF THIS SOFTWARE FOR ANY PARTICULAR PURPOSE.  The software 
 * is provided "as is" without express or implied warranty of any kind.
*/


#ifndef ns_rlc_h
#define ns_rlc_h

#include <delay.h>
#include <queue.h>
#include <arp.h>
#include <classifier.h>
#include <lanRouter.h>
#include <varp.h>
#include <rlc-timers.h>
//#include	<rlc-timers.h>
 
enum RLCFrameType {
	RLC_DATA		= 0x0001,
	RLC_ACK		= 0x0010,
	RLC_NACK		= 0x0000,
};

struct hdr_rlc {
	RLCFrameType rlctype_;		// link-layer frame type
	int seqno_;			// sequence number
	int ackno_;			// acknowledgement number
	int bopno_;			// begin of packet seqno
	int eopno_;			// end of packet seqno
	int psize_;			// size of packet
	double sendtime_;		// time the packet is sent

	static int offset_;
	inline int& offset() { return offset_; }
	static hdr_rlc* access(const Packet* p) {
		return (hdr_rlc*) p->access(offset_);
	}

	inline RLCFrameType& rlctype() { return rlctype_; }
	inline int& seqno() { return seqno_; }
	inline int& ackno() { return ackno_; }
	inline int& bopno() { return bopno_; }
	inline int& eopno() { return eopno_; }
	inline int& psize() { return psize_; }
	inline double& sendtime() { return sendtime_; }
};


class RLC : public LinkDelay {
	friend class rlcTxTimer;
	friend class rlcackTimer;
public:
//	friend void ARPTable::arpinput(Packet *p, LL* ll);
//	friend void ARPTable::arprequest(nsaddr_t src, nsaddr_t dst, LL* ll);
	RLC();
	virtual void recv(Packet* p, Handler* h);
	void handle(Event* e) { recv((Packet*)e, 0); }
	inline int initialized() {
		return (mac_ && uptarget_ && downtarget_);
	}
//sandy's new funcs
	virtual void recvACK(Packet* p);
	virtual void recvDATA(Packet* p);
	virtual void sendUpDATA(Packet* p);
	virtual void enqueDATA(Packet* p);
	virtual void sendDownDATA(void);
	virtual void sendACK(Packet* p);
//	virtual void sendUp(Packet* p);
//	virtual void sendDown(Packet* p);
	virtual void sendHandler(void);
	virtual void send_timer(void);
	virtual void sendackHandler(void);
	virtual void send_acktimer(void);
	virtual void RetransmitDATA(void);
	virtual void RetransmitACK(void);
	virtual void sendDownDATAonACK(void);
	inline int seqno() { return seqno_; }
	inline int ackno() { return ackno_; }
	inline int macDA() { return macDA_; }
        inline Queue *ifq() { return ifq_; }
        inline NsObject* downtarget() { return downtarget_; }
        inline NsObject* uptarget() { return uptarget_; }
 	inline ARPTable *arp_table() { return arptable_; }
	
protected:
	int command(int argc, const char*const* argv);

  	static int rlcverbose_; //rj  

	
	int seqno_;			// link-layer sequence number
	int ackno_;			// ACK received so far
	int rackno_;			// seq no of left most pkt
	int macDA_;			// destination MAC address
	int window_;			//sandy window size for sack	
        Queue* ifq_;			// interface queue
	   PacketQueue* buf_;		//sandy's queue
	   PacketQueue* Txbuf_;		//sandy's Tx buffer
	   PacketQueue* Rxbuf_;		//sandy's Rx buffer
	Mac*   mac_;		        // MAC object
        LanRouter* lanrouter_;          // for lookups of the next hop
	ARPTable*  arptable_;           // ARP table object
	VARPTable* varp_;               // Virtual ARP object
	
	NsObject* downtarget_;		// for outgoing packet 
	NsObject* uptarget_;		// for incoming packet
        
	int acked_;			//sandy
	int rlcfraged_;
	int rlcfragsz_;
	int datacounter;
	int ackcounter;
	Packet *pktTx_;
	Packet *pktRx_;
	int inseq_;			//sandy
	int unackseqno_;		//sandy
	int numdups;	 		//sandy
private:
	rlcTxTimer	lhSend_;
	rlcackTimer acSend_;
};

#endif