/* -*-	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. * * Ported from CMU/Monarch's code, nov'98 -Padma Haldar. * * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/mac/phy.h,v 1.7 2000/08/17 00:03:38 haoboy Exp $ * * superclass for all network interfaces  =================================================================== * Phy represents the hardware that actually controls the channel * access for the node. Phy transmits/receives pkts from the channel * to which it is connected. No pkts are buffered at this layer as * the decision to send has already been made and the packet is on * its way to the "Channel". *================================================================== */#ifndef ns_phy_h#define ns_phy_h#include <assert.h>#include "bi-connector.h"#include "lib/bsd-list.h"class Phy;LIST_HEAD(if_head, Phy);#include "channel.h"#include "node.h"#include "mac.h"class Node;class LinkHead;/*--------------------------------------------------------------  Phy : Base class for all network interfaces used to control  channel access ---------------------------------------------------------------*/class Phy : public BiConnector { public:	Phy();	void recv(Packet* p, Handler* h);		virtual void sendDown(Packet *p)=0;		virtual int sendUp(Packet *p)=0;	inline double  txtime(Packet *p) {		return (hdr_cmn::access(p)->size() * 8.0) / bandwidth_; }	inline double txtime(int bytes) {		return (8.0 * bytes / bandwidth_); }	virtual double  bittime() const { return 1/bandwidth_; }	// list of all network interfaces on a channel	Phy* nextchnl(void) const { return chnl_link_.le_next; }	inline void insertchnl(struct if_head *head) {		LIST_INSERT_HEAD(head, this, chnl_link_);		//channel_ = chnl;	}#ifdef MIT_uAMPS	inline void deletechnl(struct if_head *head) {		LIST_REMOVE(this, chnl_link_);		//delete channel_;	}#endif	// list of all network interfaces on a node	Phy* nextnode(void) const { return node_link_.le_next; }	inline void insertnode(struct if_head* head) {		LIST_INSERT_HEAD(head, this, node_link_);		//node_ = node;	}	inline void removechnl() {		LIST_REMOVE(this, chnl_link_);	}	void setchnl (Channel *chnl) { channel_ = chnl; }	virtual void setnode (Node *node) { node_ = node; }	virtual Node* node(void) const { return node_; } 	virtual Channel* channel(void) const {return channel_;}			virtual void    dump(void) const;	LinkHead* head() { return head_; } protected:	//void		drop(Packet *p);	int		command(int argc, const char*const* argv);	int             index_;		Node* node_;	LinkHead* head_; // the entry point of this network stack  	/*   * A list of all "network interfaces" on a given channel.   * Note: a node may have multiple interfaces, each of which   * is on a different channel.   */	LIST_ENTRY(Phy) chnl_link_;  /*   * A list of all "network interfaces" for a given node.   * Each interface is assoicated with exactly one node   * and one channel.   */	LIST_ENTRY(Phy) node_link_;	/* ============================================================     Physical Layer State   ============================================================ */			double bandwidth_;                   // bit rate	Channel *channel_;    // the channel for output#ifdef MIT_uAMPS	double *cs_end_;  // time when carrier sence will end per codepublic:	inline double csEnd(int code) { return cs_end_[code]; }#endif};#endif // ns_phy_h