Antiphon.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * 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.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
     *   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.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed Antiphon (struct plc * plc);
     *
     *   plc.h
     *
     *   instruct one powerline device to send trash frames to another
     *   for a given period (in seconds) to establish source device RX
     *   PHY rate and target device TX PHY rate; this does not work if
     *   the source device is also the local device, for some reason;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef ANTIPHON_SOURCE
    #define ANTIPHON_SOURCE

    #include <memory.h>
    #include <errno.h>

    #include "../tools/error.h"
    #include "../tools/flags.h"
    #include "../plc/plc.h"

    signed Antiphon (struct plc * plc, byte source [], byte target [])

    {
    	struct channel * channel = (struct channel *)(plc->channel);
    	struct message * message = (struct message *)(plc->message);

    #ifndef __GNUC__
    #pragma pack (push,1)
    #endif

    	struct __packed vs_fr_lbk_request
    	{
    		struct ethernet_hdr ethernet;
    		struct qualcomm_hdr qualcomm;
    		uint8_t DURATION;
    		uint8_t RESERVED;
    		uint16_t LENGTH;
    		uint8_t PACKET [1038];
    	}
    	* request = (struct vs_fr_lbk_request *) (message);

    #ifndef __GNUC__
    #pragma pack (pop)
    #endif

    	if (_allclr (plc->flags, PLC_SILENCE))
    	{
    		char sourcename [ETHER_ADDR_LEN * 3];
    		char targetname [ETHER_ADDR_LEN * 3];
    		hexdecode (source, ETHER_ADDR_LEN, sourcename, sizeof (sourcename));
    		hexdecode (target, ETHER_ADDR_LEN, targetname, sizeof (targetname));
    		fprintf (stderr, "%s %s %s\n", channel->ifname, sourcename, targetname);
    	}
    	memset (message, 0, sizeof (* message));
    	EthernetHeader (&request->ethernet, source, target, channel->type);
    	QualcommHeader (&request->qualcomm, 0, 41036);
    	request->DURATION = plc->timer;
    	request->LENGTH = HTOLE16 (sizeof (request->PACKET));
    	memset (request->PACKET, 0xA5, sizeof (request->PACKET));
    	EthernetHeader (request->PACKET, target, source, ETHERTYPE_IP);
    	plc->packetsize = sizeof (* request);
    	if (SendMME (plc) <= 0)
    	{
    		error (1, errno, CHANNEL_CANTSEND);
    	}

    #if 0

    /*
     *	This causes a multi-device session to terminate if the device has recently
     *	been removed or powered-off; The device appears to be present but will not
     *	respond; Also, this terminates a session if the network is overloaded with
     *	traffic;
     */

    	if (ReadMME (plc, 0, 41037) <= 0)
    	{
    		error (1, errno, CHANNEL_CANTREAD);
    	}

    #endif

    	sleep (plc->timer);
    	return (0);
    }

    #endif

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