/* -*-	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:  * * Ported from CMU/Monarch's code, nov'98 -Padma Haldar. * phy.cc */#include <math.h>#include "config.h"#include <packet.h>#include <phy.h>#include <dsr/hdr_sr.h>class Mac;static int InterfaceIndex = 0;Phy::Phy() : BiConnector() {	index_ = InterfaceIndex++;	bandwidth_ = 0.0;	channel_ = 0;	node_ = 0;	head_ = 0;#ifdef MIT_uAMPS	/* Keep track of when transmission ends for carrier sense. */	/* Since CDMA can be used with CSMA, need to keep track of when		 transmissions from each CDMA code will end. */	cs_end_ = new double[1000];	for (int i=0; i<1000; i++) cs_end_[i] = 0;#endif}intPhy::command(int argc, const char*const* argv) {	if (argc == 2) {		Tcl& tcl = Tcl::instance();		if(strcmp(argv[1], "id") == 0) {			tcl.resultf("%d", index_);			return TCL_OK;		}	}	else if(argc == 3) {		TclObject *obj;		if( (obj = TclObject::lookup(argv[2])) == 0) {			fprintf(stderr, "%s lookup failed\n", argv[1]);			return TCL_ERROR;		}		if (strcmp(argv[1], "channel") == 0) {                        assert(channel_ == 0);			channel_ = (Channel*) obj;			downtarget_ = (NsObject*) obj;			// LIST_INSERT_HEAD() is done by Channel			return TCL_OK;		}		else if (strcmp(argv[1], "node") == 0) {			assert(node_ == 0);			node_ = (Node*) obj;			// LIST_INSERT_HEAD() is done by Node			return TCL_OK;		}		else if (strcmp(argv[1], "linkhead") == 0) {			head_ = (LinkHead*)  obj;			return (TCL_OK);		}	} 	return BiConnector::command(argc, argv);}voidPhy::recv(Packet* p, Handler*){	struct hdr_cmn *hdr = HDR_CMN(p);		//struct hdr_sr *hsr = HDR_SR(p);		/*	 * Handle outgoing packets	 */	switch(hdr->direction()) {	case hdr_cmn::DOWN :		/*		 * The MAC schedules its own EOT event so we just		 * ignore the handler here.  It's only purpose		 * it distinguishing between incoming and outgoing		 * packets.		 */		sendDown(p);		return;	case hdr_cmn::UP :		if (sendUp(p) == 0) {			/*			 * XXX - This packet, even though not detected,			 * contributes to the Noise floor and hence			 * may affect the reception of other packets.			 */			Packet::free(p);			return;		} else {			uptarget_->recv(p, (Handler*) 0);		}		break;	default:		printf("Direction for pkt-flow not specified; Sending pkt up the stack on default.\n\n");		if (sendUp(p) == 0) {			/*			 * XXX - This packet, even though not detected,			 * contributes to the Noise floor and hence			 * may affect the reception of other packets.			 */			Packet::free(p);			return;		} else {			uptarget_->recv(p, (Handler*) 0);		}	}	}/* NOTE: this might not be the best way to structure the relationbetween the actual interfaces subclassed from net-if(phy) and net-if(phy). It's fine for now, but if we were to decide to have the interfacesthemselves properly handle multiple incoming packets (they currentlyrequire assistance from the mac layer to do this), then it's not asgeneric as I'd like.  The way it is now, each interface will have tohave it's own logic to keep track of the packets that are arriving.Seems like this is general service that net-if could provide.Ok.  A fair amount of restructuring is going to have to happen herewhen/if net-if keep track of the noise floor at their location.  I'mgonna punt on it for now.Actually, this may be all wrong.  Perhaps we should keep a separate noise floor per antenna, which would mean the particular interface typeswould have to track noise floor themselves, since only they know whatkind of antenna diversity they have.  -dam 8/7/98 */// double// Phy::txtime(Packet *p) const// {// 	hdr_cmn *hdr = HDR_CMN(p);// 	return hdr->size() * 8.0 / Rb_;// }voidPhy::dump(void) const{	fprintf(stdout, "\tINDEX: %d\n",		index_);	fprintf(stdout, "\tuptarget: %x, channel: %x",		(u_int32_t) uptarget_, (u_int32_t) channel_);}