/* -*-	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 Daedalus Research
 *	Group at the University of California Berkeley.
 * 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.
 *
 * Contributed by the Daedalus Research Group, http://daedalus.cs.berkeley.edu
 *
 * @(#) $Header: /usr/src/mash/repository/vint/ns-2/ll.h,v 1.23 1998/10/15 23:11:35 gnguyen Exp $ (UCB)
 */

#ifndef ns_ll_h
#define ns_ll_h

#include "delay.h"
#include "classifier.h"
#include "lanRouter.h"

enum LLFrameType {
	LL_DATA		= 0x0001,
	LL_ACK		= 0x0010,
};

struct hdr_ll {
	LLFrameType lltype_;		// 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_ll* access(Packet* p) {
		return (hdr_ll*) p->access(offset_);
	}

	inline LLFrameType& lltype() { return lltype_; }
	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 LL : public LinkDelay {
public:
	LL();
	virtual void recv(Packet* p, Handler* h);
	virtual void sendto(Packet* p, Handler* h = 0);
	virtual void recvfrom(Packet* p);

	inline int seqno() { return seqno_; }
	inline int ackno() { return ackno_; }
	inline int macDA() { return macDA_; }
        inline Queue *ifq() { return ifq_; }
        inline NsObject* sendtarget() { return sendtarget_; }
        inline NsObject* recvtarget() { return recvtarget_; }

protected:
	int command(int argc, const char*const* argv);
	void handle(Event* e) { recv((Packet*)e, 0); }
	inline virtual int arp (int ip_addr) { return ip_addr; } 
	int seqno_;			// link-layer sequence number
	int ackno_;			// ACK received so far
	int macDA_;			// destination MAC address
        Queue* ifq_;			// interface queue
        NsObject* sendtarget_;		// for outgoing packet 
	NsObject* recvtarget_;		// for incoming packet

        LanRouter* lanrouter_; // for lookups of the next hop
};

#endif