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nwkRouteDiscovery.c
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nwkRouteDiscovery.c
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/**
* \file nwkRouteDiscovery.c
*
* \brief Route discovery implementation
*
* Copyright (C) 2012-2014, Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The name of Atmel may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
*
* \asf_license_stop
*
* $Id: nwkRouteDiscovery.c 9157 2014-01-28 19:32:53Z ataradov $
*
*/
/*- Includes ---------------------------------------------------------------*/
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include "sysTypes.h"
#include "sysTimer.h"
#include "sysConfig.h"
#include "nwk.h"
#include "nwkTx.h"
#include "nwkFrame.h"
#include "nwkRoute.h"
#include "nwkGroup.h"
#include "nwkCommand.h"
#include "nwkRouteDiscovery.h"
#ifdef NWK_ENABLE_ROUTE_DISCOVERY
/*- Definitions ------------------------------------------------------------*/
#define NWK_ROUTE_DISCOVERY_BEST_LINK_QUALITY 255
#define NWK_ROUTE_DISCOVERY_NO_LINK 0
#define NWK_ROUTE_DISCOVERY_TIMER_INTERVAL 100 // ms
/*- Types ------------------------------------------------------------------*/
enum
{
NWK_RD_STATE_WAIT_FOR_ROUTE = 0x40,
};
typedef struct NwkRouteDiscoveryTableEntry_t
{
uint16_t srcAddr;
uint16_t dstAddr;
uint8_t multicast;
uint16_t senderAddr;
uint8_t forwardLinkQuality;
uint8_t reverseLinkQuality;
uint16_t timeout;
} NwkRouteDiscoveryTableEntry_t;
/*- Prototypes -------------------------------------------------------------*/
static NwkRouteDiscoveryTableEntry_t *nwkRouteDiscoveryFindEntry(uint16_t src,
uint16_t dst, uint8_t multicast);
static NwkRouteDiscoveryTableEntry_t *nwkRouteDiscoveryNewEntry(void);
static void nwkRouteDiscoveryTimerHandler(SYS_Timer_t *timer);
static bool nwkRouteDiscoverySendRequest(NwkRouteDiscoveryTableEntry_t *entry, uint8_t lq);
static void nwkRouteDiscoverySendReply(NwkRouteDiscoveryTableEntry_t *entry, uint8_t flq, uint8_t rlq);
static void nwkRouteDiscoveryDone(NwkRouteDiscoveryTableEntry_t *entry, bool status);
static uint8_t nwkRouteDiscoveryUpdateLq(uint8_t lqa, uint8_t lqb);
/*- Variables --------------------------------------------------------------*/
static NwkRouteDiscoveryTableEntry_t nwkRouteDiscoveryTable[NWK_ROUTE_DISCOVERY_TABLE_SIZE];
static SYS_Timer_t nwkRouteDiscoveryTimer;
/*- Implementations --------------------------------------------------------*/
/*************************************************************************//**
@brief Initializes the Route Discovery module
*****************************************************************************/
void nwkRouteDiscoveryInit(void)
{
for (uint8_t i = 0; i < NWK_ROUTE_DISCOVERY_TABLE_SIZE; i++)
nwkRouteDiscoveryTable[i].timeout = 0;
nwkRouteDiscoveryTimer.interval = NWK_ROUTE_DISCOVERY_TIMER_INTERVAL;
nwkRouteDiscoveryTimer.mode = SYS_TIMER_INTERVAL_MODE;
nwkRouteDiscoveryTimer.handler = nwkRouteDiscoveryTimerHandler;
}
/*************************************************************************//**
*****************************************************************************/
void nwkRouteDiscoveryRequest(NwkFrame_t *frame)
{
NwkFrameHeader_t *header = &frame->header;
NwkRouteDiscoveryTableEntry_t *entry;
entry = nwkRouteDiscoveryFindEntry(nwkIb.addr, header->nwkDstAddr, header->nwkFcf.multicast);
if (entry)
{
frame->state = NWK_RD_STATE_WAIT_FOR_ROUTE;
return;
}
entry = nwkRouteDiscoveryNewEntry();
if (entry)
{
entry->srcAddr = nwkIb.addr;
entry->dstAddr = header->nwkDstAddr;
entry->multicast = header->nwkFcf.multicast;
entry->senderAddr = NWK_BROADCAST_ADDR;
if (nwkRouteDiscoverySendRequest(entry, NWK_ROUTE_DISCOVERY_BEST_LINK_QUALITY))
{
frame->state = NWK_RD_STATE_WAIT_FOR_ROUTE;
return;
}
}
nwkTxConfirm(frame, NWK_NO_ROUTE_STATUS);
}
/*************************************************************************//**
*****************************************************************************/
static NwkRouteDiscoveryTableEntry_t *nwkRouteDiscoveryFindEntry(uint16_t src,
uint16_t dst, uint8_t multicast)
{
for (uint8_t i = 0; i < NWK_ROUTE_DISCOVERY_TABLE_SIZE; i++)
{
if (nwkRouteDiscoveryTable[i].timeout > 0 &&
nwkRouteDiscoveryTable[i].srcAddr == src &&
nwkRouteDiscoveryTable[i].dstAddr == dst &&
nwkRouteDiscoveryTable[i].multicast == multicast)
return &nwkRouteDiscoveryTable[i];
}
return NULL;
}
/*************************************************************************//**
*****************************************************************************/
static NwkRouteDiscoveryTableEntry_t *nwkRouteDiscoveryNewEntry(void)
{
NwkRouteDiscoveryTableEntry_t *entry = NULL;
for (uint8_t i = 0; i < NWK_ROUTE_DISCOVERY_TABLE_SIZE; i++)
{
if (0 == nwkRouteDiscoveryTable[i].timeout)
{
entry = &nwkRouteDiscoveryTable[i];
break;
}
}
if (entry)
{
entry->forwardLinkQuality = NWK_ROUTE_DISCOVERY_NO_LINK;
entry->reverseLinkQuality = NWK_ROUTE_DISCOVERY_NO_LINK;
entry->timeout = NWK_ROUTE_DISCOVERY_TIMEOUT;
SYS_TimerStart(&nwkRouteDiscoveryTimer);
}
return entry;
}
/*************************************************************************//**
*****************************************************************************/
static void nwkRouteDiscoveryTimerHandler(SYS_Timer_t *timer)
{
NwkRouteDiscoveryTableEntry_t *entry;
bool restart = false;
for (uint8_t i = 0; i < NWK_ROUTE_DISCOVERY_TABLE_SIZE; i++)
{
entry = &nwkRouteDiscoveryTable[i];
if (entry->timeout > NWK_ROUTE_DISCOVERY_TIMER_INTERVAL)
{
entry->timeout -= NWK_ROUTE_DISCOVERY_TIMER_INTERVAL;
restart = true;
}
else
{
entry->timeout = 0;
if (entry->srcAddr == nwkIb.addr)
nwkRouteDiscoveryDone(entry, entry->reverseLinkQuality > 0);
}
}
if (restart)
SYS_TimerStart(timer);
}
/*************************************************************************//**
*****************************************************************************/
static bool nwkRouteDiscoverySendRequest(NwkRouteDiscoveryTableEntry_t *entry, uint8_t lq)
{
NwkFrame_t *req;
NwkCommandRouteRequest_t *command;
if (NULL == (req = nwkFrameAlloc()))
return false;
nwkFrameCommandInit(req);
req->size += sizeof(NwkCommandRouteRequest_t);
req->tx.confirm = NULL;
req->header.nwkFcf.linkLocal = 1;
req->header.nwkDstAddr = NWK_BROADCAST_ADDR;
command = (NwkCommandRouteRequest_t *)req->payload;
command->id = NWK_COMMAND_ROUTE_REQUEST;
command->srcAddr = entry->srcAddr;
command->dstAddr = entry->dstAddr;
command->multicast = entry->multicast;
command->linkQuality = lq;
nwkTxFrame(req);
return true;
}
/*************************************************************************//**
*****************************************************************************/
bool nwkRouteDiscoveryRequestReceived(NWK_DataInd_t *ind)
{
NwkCommandRouteRequest_t *command = (NwkCommandRouteRequest_t *)ind->data;
NwkRouteDiscoveryTableEntry_t *entry;
uint8_t linkQuality;
bool reply = false;
if (sizeof(NwkCommandRouteRequest_t) != ind->size)
return false;
#ifdef NWK_ENABLE_MULTICAST
if (1 == command->multicast && NWK_GroupIsMember(command->dstAddr))
reply = true;
#endif
if (0 == command->multicast && command->dstAddr == nwkIb.addr)
reply = true;
if (command->srcAddr == nwkIb.addr)
return true;
if (false == reply && nwkIb.addr & NWK_ROUTE_NON_ROUTING)
return true;
linkQuality = nwkRouteDiscoveryUpdateLq(command->linkQuality, ind->lqi);
entry = nwkRouteDiscoveryFindEntry(command->srcAddr, command->dstAddr, command->multicast);
if (entry)
{
if (linkQuality <= entry->forwardLinkQuality)
return true;
}
else
{
if (NULL == (entry = nwkRouteDiscoveryNewEntry()))
return true;
}
entry->srcAddr = command->srcAddr;
entry->dstAddr = command->dstAddr;
entry->multicast = command->multicast;
entry->senderAddr = ind->srcAddr;
entry->forwardLinkQuality = linkQuality;
if (reply)
{
nwkRouteUpdateEntry(command->srcAddr, 0, ind->srcAddr, linkQuality);
nwkRouteDiscoverySendReply(entry, linkQuality, NWK_ROUTE_DISCOVERY_BEST_LINK_QUALITY);
}
else
{
nwkRouteDiscoverySendRequest(entry, linkQuality);
}
return true;
}
/*************************************************************************//**
*****************************************************************************/
static void nwkRouteDiscoverySendReply(NwkRouteDiscoveryTableEntry_t *entry, uint8_t flq, uint8_t rlq)
{
NwkFrame_t *req;
NwkCommandRouteReply_t *command;
if (NULL == (req = nwkFrameAlloc()))
return;
nwkFrameCommandInit(req);
req->size += sizeof(NwkCommandRouteReply_t);
req->tx.confirm = NULL;
req->tx.control = NWK_TX_CONTROL_DIRECT_LINK;
req->header.nwkDstAddr = entry->senderAddr;
command = (NwkCommandRouteReply_t *)req->payload;
command->id = NWK_COMMAND_ROUTE_REPLY;
command->srcAddr = entry->srcAddr;
command->dstAddr = entry->dstAddr;
command->multicast = entry->multicast;
command->forwardLinkQuality = flq;
command->reverseLinkQuality = rlq;
nwkTxFrame(req);
}
/*************************************************************************//**
*****************************************************************************/
bool nwkRouteDiscoveryReplyReceived(NWK_DataInd_t *ind)
{
NwkCommandRouteReply_t *command = (NwkCommandRouteReply_t *)ind->data;
NwkRouteDiscoveryTableEntry_t *entry;
uint8_t linkQuality;
if (sizeof(NwkCommandRouteReply_t) != ind->size)
return false;
entry = nwkRouteDiscoveryFindEntry(command->srcAddr, command->dstAddr, command->multicast);
linkQuality = nwkRouteDiscoveryUpdateLq(command->reverseLinkQuality, ind->lqi);
if (entry && command->forwardLinkQuality > entry->reverseLinkQuality)
{
entry->reverseLinkQuality = command->forwardLinkQuality;
if (command->srcAddr == nwkIb.addr)
{
nwkRouteUpdateEntry(command->dstAddr, command->multicast, ind->srcAddr, command->forwardLinkQuality);
//nwkRouteDiscoveryDone(entry, true);
}
else
{
nwkRouteUpdateEntry(command->dstAddr, command->multicast, ind->srcAddr, linkQuality);
nwkRouteUpdateEntry(command->srcAddr, 0, entry->senderAddr, entry->forwardLinkQuality);
nwkRouteDiscoverySendReply(entry, command->forwardLinkQuality, linkQuality);
}
}
return true;
}
/*************************************************************************//**
*****************************************************************************/
static void nwkRouteDiscoveryDone(NwkRouteDiscoveryTableEntry_t *entry, bool status)
{
NwkFrame_t *frame = NULL;
while (NULL != (frame = nwkFrameNext(frame)))
{
if (NWK_RD_STATE_WAIT_FOR_ROUTE != frame->state)
continue;
if (entry->dstAddr != frame->header.nwkDstAddr ||
entry->multicast != frame->header.nwkFcf.multicast)
continue;
if (status)
nwkTxFrame(frame);
else
nwkTxConfirm(frame, NWK_NO_ROUTE_STATUS);
}
}
/*************************************************************************//**
*****************************************************************************/
static uint8_t nwkRouteDiscoveryUpdateLq(uint8_t lqa, uint8_t lqb)
{
return ((uint16_t)lqa * lqb) >> 8;
}
#endif // NWK_ENABLE_ROUTE_DISCOVERY