evse_cm_slac_param.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 evse_cm_slac_param (struct session * session, struct channel * channel, struct message * message);
     *
     *   slac.h
     *
     *   EVSE-HLE listens indefinitely for a cm_slac_param request and
     *   responds with a cm_slac_param confirm; this function should not
     *   exit untile a cm_slac_param request so that SLAC sessions will
     *   properly synchronize;
     *
     *   unlike some other EVSE-HLE functions, this one does not check
     *   the run identifier because this is the first point at which a
     *   new run identifier is received; it should, however, store the
     *   run identifier to verify future messages from the PEV;
     *
     *   EVSE-HLE should copy the message OSA to the session variable PEV
     *   MAC address; the PEV MAC address can then be used to respond in
     *   unicast to the right PEVHLE;
     *
     *   EVSE-HLE should copy the run identifier to the session variable
     *   for use later in the session; this will be used to distinguish
     *   one PEV-EVSE session from another;
     *
     *   EVSE-HLE should copy the application type and security type to
     *   the session variable unless it wants to operate in a mode that
     *   is different from the PEV;
     *
     *   at this point, the EVSE-HLE dictates the number of msounds and
     *   the msound timeout;
     *
     *   EVSE-HLE should set the msound target to the broadcast address;
     *
     *   EVSE-HLE should set the number of sounds to 8 and the timeout
     *   to 10 intervals of 100ms.
     *
     *   EVSE-HLE may send zeros for the forwarding station since it is
     *   not used here;
     *
     *--------------------------------------------------------------------*/

    #ifndef EVSE_CM_SLAC_PARAM_SOURCE
    #define EVSE_CM_SLAC_PARAM_SOURCE

    #include <stdio.h>
    #include <string.h>

    #include "../ether/channel.h"
    #include "../tools/types.h"
    #include "../tools/flags.h"
    #include "../tools/error.h"
    #include "../tools/memory.h"
    #include "../iso15118/slac.h"

    signed evse_cm_slac_param (struct session * session, struct channel * channel, struct message * message)

    {
    	extern byte const broadcast [ETHER_ADDR_LEN];
    	struct cm_slac_param_request * request = (struct cm_slac_param_request *) (message);
    	struct cm_slac_param_confirm * confirm = (struct cm_slac_param_confirm *) (message);
    	while (readmessage (channel, message, HOMEPLUG_MMV, (CM_SLAC_PARAM | MMTYPE_REQ)) > 0)
    	{
    		slac_debug (session, 0, __func__, "<-- CM_SLAC_PARAM.REQ");
    		session->APPLICATION_TYPE = request->APPLICATION_TYPE;
    		session->SECURITY_TYPE = request->SECURITY_TYPE;
    		memcpy (session->PEV_MAC, request->ethernet.OSA, sizeof (session->PEV_MAC));
    		memcpy (session->RunID, request->RunID, sizeof (session->RunID));

    #if SLAC_DEBUG

    		if (_anyset (session->flags, SLAC_VERBOSE))
    		{
    			char string [256];
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.APPLICATION_TYPE %d", request->APPLICATION_TYPE);
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.SECURITY_TYPE %d", request->SECURITY_TYPE);
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.RunID %s", HEXSTRING (string, request->RunID));
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.CipherSuiteSetSize %d", request->CipherSuiteSetSize);
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.CipherSuite [0] %d", request->CipherSuite [0]);
    			slac_debug (session, 0, __func__, "CM_SLAC_PARAM.REQ.CipherSuite [1] %d", request->CipherSuite [1]);
    		}

    #endif

    		if (_anyset (session->flags, SLAC_COMPARE))
    		{
    			if (LE16TOH (request->CipherSuite [0]) != (uint16_t) (session->counter))
    			{
    				slac_debug (session, session->exit, __func__, "session->counter mismatch! PEV=(%d) EVSE=(%d)", LE16TOH (request->CipherSuite [0]), session->counter);
    			}
    		}
    		slac_debug (session, 0, __func__, "--> CM_SLAC_PARAM.CNF");
    		memset (message, 0, sizeof (* message));
    		EthernetHeader (& confirm->ethernet, session->PEV_MAC, channel->host, channel->type);
    		HomePlugHeader1 (& confirm->homeplug, HOMEPLUG_MMV, (CM_SLAC_PARAM | MMTYPE_CNF));
    		memcpy (confirm->MSOUND_TARGET, broadcast, sizeof (confirm->MSOUND_TARGET));
    		confirm->NUM_SOUNDS = session->NUM_SOUNDS;
    		confirm->TIME_OUT = session->TIME_OUT;
    		confirm->RESP_TYPE = session->RESP_TYPE;
    		memcpy (confirm->FORWARDING_STA, session->FORWARDING_STA, sizeof (confirm->FORWARDING_STA));
    		confirm->APPLICATION_TYPE = session->APPLICATION_TYPE;
    		confirm->SECURITY_TYPE = session->SECURITY_TYPE;
    		memcpy (confirm->RunID, session->RunID, sizeof (confirm->RunID));
    		confirm->CipherSuite = HTOLE16 ((uint16_t) (session->counter));
    		if (sendmessage (channel, message, (ETHER_MIN_LEN - ETHER_CRC_LEN)) <= 0)
    		{
    			return (slac_debug (session, 1, __func__, CHANNEL_CANTSEND));
    		}
    		return (0);
    	}
    	return (slac_debug (session, 0, __func__, "<-- CM_SLAC_PARAM.REQ ?"));
    }

    #endif

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