evse_cm_set_key.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_set_key (struct session * session, struct channel * channel, struct message * message);
     *
     *   slac.h
     *
     *   PEV-HLE sets the NMK and NID on PEV-PLC using CM_SET_KEY.REQ;
     *   the NMK and NID must match those provided by EVSE-HLE using
     *   CM_SLAC_MATCH.CNF;
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef EVSE_CM_SET_KEY_SOURCE
    #define EVSE_CM_SET_KEY_SOURCE

    #include <string.h>

    #include "../ether/channel.h"
    #include "../tools/memory.h"
    #include "../tools/error.h"
    #include "../tools/flags.h"
    #include "../mme/qualcomm.h"
    #include "../mme/homeplug.h"
    #include "../iso15118/slac.h"

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

    {

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

    	struct __packed cm_set_key_request
    	{
    		struct ethernet_hdr ethernet;
    		struct homeplug_fmi homeplug;
    		uint8_t KEYTYPE;
    		uint32_t MYNOUNCE;
    		uint32_t YOURNOUNCE;
    		uint8_t PID;
    		uint16_t PRN;
    		uint8_t PMN;
    		uint8_t CCOCAP;
    		uint8_t NID [SLAC_NID_LEN];
    		uint8_t NEWEKS;
    		uint8_t NEWKEY [SLAC_NMK_LEN];
    		uint8_t RSVD [3];
    	}
    	* request = (struct cm_set_key_request *) (message);
    	struct __packed cm_set_key_confirm
    	{
    		struct ethernet_hdr ethernet;
    		struct homeplug_fmi homeplug;
    		uint8_t RESULT;
    		uint32_t MYNOUNCE;
    		uint32_t YOURNOUNCE;
    		uint8_t PID;
    		uint16_t PRN;
    		uint8_t PMN;
    		uint8_t CCOCAP;
    		uint8_t RSVD [27];
    	}
    	* confirm = (struct cm_set_key_confirm *) (message);

    #ifndef __GNUC__
    #pragma pack (pop)
    #endif

    	memset (message, 0, sizeof (* message));
    	slac_debug (session, 0, __func__, "--> CM_SET_KEY.REQ");
    	EthernetHeader (& request->ethernet, channel->peer, channel->host, channel->type);
    	HomePlugHeader1 (& request->homeplug, HOMEPLUG_MMV, (CM_SET_KEY | MMTYPE_REQ));
    	request->KEYTYPE = SLAC_CM_SETKEY_KEYTYPE;
    	memset (& request->MYNOUNCE, 0xAA, sizeof (request->MYNOUNCE));
    	memset (& request->YOURNOUNCE, 0x00, sizeof (request->YOURNOUNCE));
    	request->PID = SLAC_CM_SETKEY_PID;
    	request->PRN = HTOLE16 (SLAC_CM_SETKEY_PRN);
    	request->PMN = SLAC_CM_SETKEY_PMN;
    	request->CCOCAP = SLAC_CM_SETKEY_CCO;
    	memcpy (request->NID, session->NID, sizeof (request->NID));
    	request->NEWEKS = SLAC_CM_SETKEY_EKS;
    	memcpy (request->NEWKEY, session->NMK, sizeof (request->NEWKEY));

    #if SLAC_DEBUG

    	if (_anyset (session->flags, SLAC_VERBOSE))
    	{
    		char string [1024];
    		slac_debug (session, 0, __func__, "CM_SET_KEY.KEYTYPE %d", request->KEYTYPE);
    		slac_debug (session, 0, __func__, "CM_SET_KEY.MYNOUNCE %s", hexstring (string, sizeof (string), & request->MYNOUNCE, sizeof (request->MYNOUNCE)));
    		slac_debug (session, 0, __func__, "CM_SET_KEY.YOURNOUNCE %s", hexstring (string, sizeof (string), & request->YOURNOUNCE, sizeof (request->MYNOUNCE)));
    		slac_debug (session, 0, __func__, "CM_SET_KEY.PID %d", request->PID);
    		slac_debug (session, 0, __func__, "CM_SET_KEY.PRN %d", LE32TOH (request->PRN));
    		slac_debug (session, 0, __func__, "CM_SET_KEY.PMN %d", request->PMN);
    		slac_debug (session, 0, __func__, "CM_SET_KEY.CCoCAP %d", request->CCOCAP);
    		slac_debug (session, 0, __func__, "CM_SET_KEY.NID %s", HEXSTRING (string, request->NID));
    		slac_debug (session, 0, __func__, "CM_SET_KEY.NEWEKS %d", request->NEWEKS);
    		slac_debug (session, 0, __func__, "CM_SET_KEY.NEWKEY %s", HEXSTRING (string, request->NEWKEY));
    	}

    #endif

    	if (sendpacket (channel, request, sizeof (* request)) <= 0)
    	{
    		return (slac_debug (session, 1, __func__, CHANNEL_CANTSEND));
    	}
    	while (readpacket (channel, confirm, sizeof (* confirm)) > 0)
    	{
    		if (ntohs (confirm->ethernet.MTYPE) != ETH_P_HPAV)
    		{
    			slac_debug (session, session->exit, __func__, "Ignore MTYPE 0x%04X", htons (confirm->ethernet.MTYPE));
    			continue;
    		}
    		if (confirm->homeplug.MMV != HOMEPLUG_MMV)
    		{
    			slac_debug (session, session->exit, __func__, "Ignore MMV 0x%02X", confirm->homeplug.MMV);
    			continue;
    		}
    		if (LE32TOH (confirm->homeplug.MMTYPE) != (CM_SET_KEY | MMTYPE_CNF))
    		{
    			slac_debug (session, session->exit, __func__, "Ignore MMTYPE 0x%04X", LE32TOH (confirm->homeplug.MMTYPE));
    			continue;
    		}
    		slac_debug (session, 0, __func__, "<-- CM_SET_KEY.CNF");
    		if (! confirm->RESULT)
    		{
    			return (slac_debug (session, session->exit, __func__, "Device refused request"));
    		}

    #if SLAC_DEBUG

    		if (_anyset (session->flags, SLAC_VERBOSE))
    		{
    			char string [1024];
    			slac_debug (session, 0, __func__, "CM_SET_KEY.RESULT %d", confirm->RESULT);
    			slac_debug (session, 0, __func__, "CM_SET_KEY.MYNOUNCE %s", hexstring (string, sizeof (string), & confirm->MYNOUNCE, sizeof (confirm->MYNOUNCE)));
    			slac_debug (session, 0, __func__, "CM_SET_KEY.YOURNOUNCE %s", hexstring (string, sizeof (string), & confirm->YOURNOUNCE, sizeof (confirm->MYNOUNCE)));
    			slac_debug (session, 0, __func__, "CM_SET_KEY.PID %d", confirm->PID);
    			slac_debug (session, 0, __func__, "CM_SET_KEY.PRN %d", LE32TOH (confirm->PRN));
    			slac_debug (session, 0, __func__, "CM_SET_KEY.PMN %d", confirm->PMN);
    			slac_debug (session, 0, __func__, "CM_SET_KEY.CCoCAP %d", confirm->CCOCAP);
    		}

    #endif

    		return (0);
    	}
    	return (slac_debug (session, session->exit, __func__, "<-- CM_SET_KEY.REQ ?"));
    }

    #endif

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