Contiki 2.6
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00001 /* 00002 * Copyright (c) 2010, Swedish Institute of Computer Science. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the Institute nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * This file is part of the Contiki operating system. 00030 * 00031 * $Id: neighbor-info.c,v 1.18 2010/12/15 14:35:07 nvt-se Exp $ 00032 */ 00033 /** 00034 * \file 00035 * A generic module for management of neighbor information. 00036 * 00037 * \author Nicolas Tsiftes <nvt@sics.se> 00038 */ 00039 00040 #include "net/neighbor-info.h" 00041 #include "net/neighbor-attr.h" 00042 #include "net/uip-ds6.h" 00043 #include "net/uip-nd6.h" 00044 00045 #define DEBUG DEBUG_NONE 00046 #include "net/uip-debug.h" 00047 00048 #define ETX_LIMIT 15 00049 #define ETX_SCALE 100 00050 #define ETX_ALPHA 90 00051 #define ETX_NOACK_PENALTY ETX_LIMIT 00052 /*---------------------------------------------------------------------------*/ 00053 NEIGHBOR_ATTRIBUTE_GLOBAL(link_metric_t, attr_etx, NULL); 00054 NEIGHBOR_ATTRIBUTE_GLOBAL(unsigned long, attr_timestamp, NULL); 00055 00056 static neighbor_info_subscriber_t subscriber_callback; 00057 /*---------------------------------------------------------------------------*/ 00058 static void 00059 update_metric(const rimeaddr_t *dest, int packet_metric) 00060 { 00061 link_metric_t *metricp; 00062 link_metric_t recorded_metric, new_metric; 00063 unsigned long time; 00064 00065 metricp = (link_metric_t *)neighbor_attr_get_data(&attr_etx, dest); 00066 packet_metric = NEIGHBOR_INFO_ETX2FIX(packet_metric); 00067 if(metricp == NULL || *metricp == 0) { 00068 recorded_metric = NEIGHBOR_INFO_ETX2FIX(ETX_LIMIT); 00069 new_metric = packet_metric; 00070 } else { 00071 recorded_metric = *metricp; 00072 /* Update the EWMA of the ETX for the neighbor. */ 00073 new_metric = ((uint16_t)recorded_metric * ETX_ALPHA + 00074 (uint16_t)packet_metric * (ETX_SCALE - ETX_ALPHA)) / ETX_SCALE; 00075 } 00076 00077 PRINTF("neighbor-info: ETX changed from %d to %d (packet ETX = %d) %d\n", 00078 NEIGHBOR_INFO_FIX2ETX(recorded_metric), 00079 NEIGHBOR_INFO_FIX2ETX(new_metric), 00080 NEIGHBOR_INFO_FIX2ETX(packet_metric), 00081 dest->u8[7]); 00082 00083 if(neighbor_attr_has_neighbor(dest)) { 00084 time = clock_seconds(); 00085 neighbor_attr_set_data(&attr_etx, dest, &new_metric); 00086 neighbor_attr_set_data(&attr_timestamp, dest, &time); 00087 if(new_metric != recorded_metric && subscriber_callback != NULL) { 00088 subscriber_callback(dest, 1, new_metric); 00089 } 00090 } 00091 } 00092 /*---------------------------------------------------------------------------*/ 00093 static void 00094 add_neighbor(const rimeaddr_t *addr) 00095 { 00096 switch(neighbor_attr_add_neighbor(addr)) { 00097 case -1: 00098 PRINTF("neighbor-info: failed to add a node.\n"); 00099 break; 00100 case 0: 00101 PRINTF("neighbor-info: The neighbor is already known\n"); 00102 break; 00103 default: 00104 break; 00105 } 00106 } 00107 /*---------------------------------------------------------------------------*/ 00108 void 00109 neighbor_info_packet_sent(int status, int numtx) 00110 { 00111 const rimeaddr_t *dest; 00112 link_metric_t packet_metric; 00113 #if UIP_DS6_LL_NUD 00114 uip_ds6_nbr_t *nbr; 00115 #endif /* UIP_DS6_LL_NUD */ 00116 00117 dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER); 00118 if(rimeaddr_cmp(dest, &rimeaddr_null)) { 00119 return; 00120 } 00121 00122 packet_metric = numtx; 00123 00124 PRINTF("neighbor-info: packet sent to %d.%d, status=%d, metric=%u\n", 00125 dest->u8[sizeof(*dest) - 2], dest->u8[sizeof(*dest) - 1], 00126 status, (unsigned)packet_metric); 00127 00128 switch(status) { 00129 case MAC_TX_OK: 00130 add_neighbor(dest); 00131 #if UIP_DS6_LL_NUD 00132 nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest); 00133 if(nbr != NULL && 00134 (nbr->state == STALE || nbr->state == DELAY || nbr->state == PROBE)) { 00135 nbr->state = REACHABLE; 00136 stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000); 00137 PRINTF("neighbor-info : received a link layer ACK : "); 00138 PRINTLLADDR((uip_lladdr_t *)dest); 00139 PRINTF(" is reachable.\n"); 00140 } 00141 #endif /* UIP_DS6_LL_NUD */ 00142 break; 00143 case MAC_TX_NOACK: 00144 packet_metric = ETX_NOACK_PENALTY; 00145 break; 00146 default: 00147 /* Do not penalize the ETX when collisions or transmission 00148 errors occur. */ 00149 return; 00150 } 00151 00152 update_metric(dest, packet_metric); 00153 } 00154 /*---------------------------------------------------------------------------*/ 00155 void 00156 neighbor_info_packet_received(void) 00157 { 00158 const rimeaddr_t *src; 00159 00160 src = packetbuf_addr(PACKETBUF_ADDR_SENDER); 00161 if(rimeaddr_cmp(src, &rimeaddr_null)) { 00162 return; 00163 } 00164 00165 PRINTF("neighbor-info: packet received from %d.%d\n", 00166 src->u8[sizeof(*src) - 2], src->u8[sizeof(*src) - 1]); 00167 00168 add_neighbor(src); 00169 } 00170 /*---------------------------------------------------------------------------*/ 00171 int 00172 neighbor_info_subscribe(neighbor_info_subscriber_t s) 00173 { 00174 if(subscriber_callback == NULL) { 00175 neighbor_attr_register(&attr_etx); 00176 neighbor_attr_register(&attr_timestamp); 00177 subscriber_callback = s; 00178 return 1; 00179 } 00180 00181 return 0; 00182 } 00183 /*---------------------------------------------------------------------------*/ 00184 link_metric_t 00185 neighbor_info_get_metric(const rimeaddr_t *addr) 00186 { 00187 link_metric_t *metricp; 00188 00189 metricp = (link_metric_t *)neighbor_attr_get_data(&attr_etx, addr); 00190 return metricp == NULL ? ETX_LIMIT : *metricp; 00191 } 00192 /*---------------------------------------------------------------------------*/