// $Id: AMFilter.nc,v 1.1.2.1 2003/09/15 17:21:10 scipio Exp $/*									tab:4 * "Copyright (c) 2000-2003 The Regents of the University  of California.   * All rights reserved. * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose, without fee, and without written agreement is * hereby granted, provided that the above copyright notice, the following * two paragraphs and the author appear in all copies of this software. *  * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *  * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS." * * Copyright (c) 2002-2003 Intel Corporation * All rights reserved. * * This file is distributed under the terms in the attached INTEL-LICENSE      * file. If you do not find these files, copies can be found by writing to * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA,  * 94704.  Attention:  Intel License Inquiry. *//* * * Date last modified:  8/25/03 * *//** * This component filters packet receptions based on AM addressing * requirements. Packets are filtered on two attributes: the * destination address must either be the local address or the * broadcast address, and the group ID must match the local group ID. * * @author Philip Levis*/includes AM;module AMFilter {  provides interface ReceiveMsg as UpperReceive[uint8_t id];  uses interface ReceiveMsg as LowerReceive[uint8_t id];}implementation {    event TOS_MsgPtr LowerReceive.receive[uint8_t id](TOS_MsgPtr msg) {    if (((msg->addr == TOS_LOCAL_ADDRESS) ||	 (msg->addr == TOS_BCAST_ADDR)) &&	(msg->group == TOS_AM_GROUP)){      dbg(DBG_AM, "AMFilter: Packet passed AM, signaling.\n");      return signal UpperReceive.receive[id](msg);    }    else {      dbg(DBG_AM, "AMFilter: Packet failed AM requirements.\n");      return msg;    }  }  default event TOS_MsgPtr UpperReceive.receive[uint8_t id](TOS_MsgPtr msg) {    return msg;  }  }