193 lines
6.3 KiB
C
193 lines
6.3 KiB
C
/*
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* Copyright (c) 2010, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: neighbor-info.c,v 1.18 2010/12/15 14:35:07 nvt-se Exp $
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*/
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/**
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* \file
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* A generic module for management of neighbor information.
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*
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* \author Nicolas Tsiftes <nvt@sics.se>
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*/
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#include "net/neighbor-info.h"
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#include "net/neighbor-attr.h"
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#include "net/uip-ds6.h"
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#include "net/uip-nd6.h"
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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#define ETX_LIMIT 15
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#define ETX_SCALE 100
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#define ETX_ALPHA 90
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#define ETX_NOACK_PENALTY ETX_LIMIT
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/*---------------------------------------------------------------------------*/
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NEIGHBOR_ATTRIBUTE_GLOBAL(link_metric_t, attr_etx, NULL);
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NEIGHBOR_ATTRIBUTE_GLOBAL(unsigned long, attr_timestamp, NULL);
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static neighbor_info_subscriber_t subscriber_callback;
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/*---------------------------------------------------------------------------*/
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static void
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update_metric(const rimeaddr_t *dest, int packet_metric)
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{
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link_metric_t *metricp;
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link_metric_t recorded_metric, new_metric;
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unsigned long time;
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metricp = (link_metric_t *)neighbor_attr_get_data(&attr_etx, dest);
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packet_metric = NEIGHBOR_INFO_ETX2FIX(packet_metric);
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if(metricp == NULL || *metricp == 0) {
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recorded_metric = NEIGHBOR_INFO_ETX2FIX(ETX_LIMIT);
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new_metric = packet_metric;
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} else {
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recorded_metric = *metricp;
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/* Update the EWMA of the ETX for the neighbor. */
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new_metric = ((uint16_t)recorded_metric * ETX_ALPHA +
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(uint16_t)packet_metric * (ETX_SCALE - ETX_ALPHA)) / ETX_SCALE;
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}
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PRINTF("neighbor-info: ETX changed from %d to %d (packet ETX = %d) %d\n",
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NEIGHBOR_INFO_FIX2ETX(recorded_metric),
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NEIGHBOR_INFO_FIX2ETX(new_metric),
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NEIGHBOR_INFO_FIX2ETX(packet_metric),
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dest->u8[7]);
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if(neighbor_attr_has_neighbor(dest)) {
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time = clock_seconds();
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neighbor_attr_set_data(&attr_etx, dest, &new_metric);
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neighbor_attr_set_data(&attr_timestamp, dest, &time);
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if(new_metric != recorded_metric && subscriber_callback != NULL) {
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subscriber_callback(dest, 1, new_metric);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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add_neighbor(const rimeaddr_t *addr)
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{
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switch(neighbor_attr_add_neighbor(addr)) {
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case -1:
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PRINTF("neighbor-info: failed to add a node.\n");
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break;
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case 0:
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PRINTF("neighbor-info: The neighbor is already known\n");
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break;
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default:
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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neighbor_info_packet_sent(int status, int numtx)
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{
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const rimeaddr_t *dest;
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link_metric_t packet_metric;
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#if UIP_DS6_LL_NUD
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uip_ds6_nbr_t *nbr;
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#endif /* UIP_DS6_LL_NUD */
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dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
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if(rimeaddr_cmp(dest, &rimeaddr_null)) {
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return;
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}
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packet_metric = numtx;
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PRINTF("neighbor-info: packet sent to %d.%d, status=%d, metric=%u\n",
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dest->u8[sizeof(*dest) - 2], dest->u8[sizeof(*dest) - 1],
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status, (unsigned)packet_metric);
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switch(status) {
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case MAC_TX_OK:
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add_neighbor(dest);
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#if UIP_DS6_LL_NUD
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nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest);
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if(nbr != NULL &&
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(nbr->state == STALE || nbr->state == DELAY || nbr->state == PROBE)) {
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nbr->state = REACHABLE;
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stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000);
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PRINTF("neighbor-info : received a link layer ACK : ");
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PRINTLLADDR((uip_lladdr_t *)dest);
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PRINTF(" is reachable.\n");
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}
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#endif /* UIP_DS6_LL_NUD */
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break;
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case MAC_TX_NOACK:
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packet_metric = ETX_NOACK_PENALTY;
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break;
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default:
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/* Do not penalize the ETX when collisions or transmission
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errors occur. */
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return;
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}
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update_metric(dest, packet_metric);
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}
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/*---------------------------------------------------------------------------*/
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void
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neighbor_info_packet_received(void)
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{
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const rimeaddr_t *src;
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src = packetbuf_addr(PACKETBUF_ADDR_SENDER);
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if(rimeaddr_cmp(src, &rimeaddr_null)) {
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return;
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}
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PRINTF("neighbor-info: packet received from %d.%d\n",
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src->u8[sizeof(*src) - 2], src->u8[sizeof(*src) - 1]);
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add_neighbor(src);
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}
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/*---------------------------------------------------------------------------*/
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int
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neighbor_info_subscribe(neighbor_info_subscriber_t s)
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{
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if(subscriber_callback == NULL) {
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neighbor_attr_register(&attr_etx);
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neighbor_attr_register(&attr_timestamp);
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subscriber_callback = s;
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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link_metric_t
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neighbor_info_get_metric(const rimeaddr_t *addr)
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{
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link_metric_t *metricp;
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metricp = (link_metric_t *)neighbor_attr_get_data(&attr_etx, addr);
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return metricp == NULL ? ETX_LIMIT : *metricp;
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}
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/*---------------------------------------------------------------------------*/
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