NetworkDevices1.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 NetworkDevices1 (struct plc * plc, void * memory, size_t extent);
     *
     *   plc.h
     *
     *   return a list powerline network device addresses on a powerline
     *   network; the list consists of a known device plus all others on
     *   the same powerline network; the device is defined by the channel
     *   peer address and appears first in the list;
     *
     *   the device address must be explicit; it cannot be the broadcast
     *   or localcast address;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *
     *--------------------------------------------------------------------*/

    #ifndef NETWORKDEVICES1_SOURCE
    #define NETWORKDEVICES1_SOURCE

    #include <stdint.h>
    #include <memory.h>

    #include "../tools/memory.h"
    #include "../tools/number.h"
    #include "../tools/types.h"
    #include "../tools/error.h"
    #include "../plc/plc.h"

    signed NetworkDevices1 (struct plc * plc, void * memory, size_t extent)

    {
    	extern const byte broadcast [ETHER_ADDR_LEN];
    	extern const byte localcast [ETHER_ADDR_LEN];
    	struct channel * channel = (struct channel *)(plc->channel);
    	struct message * message = (struct message *)(plc->message);
    	uint8_t * origin = (byte *)(memory);
    	uint8_t * offset = (byte *)(memory);

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

    	struct __packed vs_nw_info_request
    	{
    		struct ethernet_hdr ethernet;
    		struct qualcomm_hdr qualcomm;
    	}
    	* request = (struct vs_nw_info_request *)(message);
    	struct __packed vs_nw_info_confirm
    	{
    		struct ethernet_hdr ethernet;
    		struct qualcomm_hdr qualcomm;
    		uint8_t data [1];
    	}
    	* confirm = (struct vs_nw_info_confirm *)(message);
    	struct __packed station
    	{
    		uint8_t MAC [ETHER_ADDR_LEN];
    		uint8_t TEI;
    		uint8_t BDA [ETHER_ADDR_LEN];
    		uint8_t AVGTX;
    		uint8_t AVGRX;
    	}
    	* station;
    	struct __packed network
    	{
    		uint8_t NID [7];
    		uint8_t SNID;
    		uint8_t TEI;
    		uint8_t ROLE;
    		uint8_t CCO_MAC [ETHER_ADDR_LEN];
    		uint8_t CCO_TEI;
    		uint8_t NUMSTAS;
    		struct station stations [1];
    	}
    	* network;
    	struct __packed networks
    	{
    		uint8_t NUMAVLNS;
    		struct network networks [1];
    	}
    	* networks = (struct networks *) (confirm->data);

    #ifndef __GNUC__
    #pragma pack (pop)
    #endif

    	ssize_t packetsize;
    	if (!memcmp (channel->peer, broadcast, sizeof (channel->peer)))
    	{
    		error (1, EINVAL, "Can't use broadcast address");
    	}
    	if (!memcmp (channel->peer, localcast, sizeof (channel->peer)))
    	{
    		error (1, EINVAL, "Can't use localcast address");
    	}
    	memset (memory, 0, extent);
    	memset (message, 0, sizeof (* message));
    	EthernetHeader (&request->ethernet, channel->peer, channel->host, channel->type);
    	EthernetHeader (&request->ethernet, channel->peer, channel->host, channel->type);
    	QualcommHeader (&request->qualcomm, 0, (VS_NW_INFO | MMTYPE_REQ));
    	if (sendpacket (channel, message, (ETHER_MIN_LEN - ETHER_CRC_LEN)) <= 0)
    	{
    		error (1, errno, CHANNEL_CANTSEND);
    	}
    	while ((packetsize = readpacket (channel, message, sizeof (* message))) > 0)
    	{
    		if (UnwantedMessage (message, packetsize, 0, (VS_NW_INFO | MMTYPE_CNF)))
    		{
    			continue;
    		}
    		network = (struct network *)(&networks->networks);
    		while (networks->NUMAVLNS--)
    		{
    			if (extent < sizeof (request->ethernet.OSA))
    			{
    				break;
    			}
    			memcpy (offset, request->ethernet.OSA, sizeof (request->ethernet.OSA));
    			offset += sizeof (request->ethernet.OSA);
    			extent -= sizeof (request->ethernet.OSA);
    			station = (struct station *)(&network->stations);
    			while (network->NUMSTAS--)
    			{
    				if (extent < sizeof (station->MAC))
    				{
    					break;
    				}
    				memcpy (offset, station->MAC, sizeof (station->MAC));
    				offset += sizeof (station->MAC);
    				extent -= sizeof (station->MAC);
    				station++;
    			}
    			network = (struct network *)(station);
    		}
    	}
    	return ((offset - origin) / ETHER_ADDR_LEN);
    }

    #endif

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