483 lines
15 KiB
C
483 lines
15 KiB
C
/**
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* \addtogroup uip6
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* @{
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*/
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/**
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* \file
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* Neighbor discovery (RFC 4861)
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* \author Mathilde Durvy <mdurvy@cisco.com>
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* \author Julien Abeille <jabeille@cisco.com>
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*/
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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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 project 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 PROJECT 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 PROJECT 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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/*
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* Copyright (c) 2006, 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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*/
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#include "net/uip-nd6.h"
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#include "net/uip-netif.h"
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#include "lib/random.h"
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#include <string.h>
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
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#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",lladdr->addr[0], lladdr->addr[1], lladdr->addr[2], lladdr->addr[3],lladdr->addr[4], lladdr->addr[5])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(addr)
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#endif
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#if UIP_LOGGING
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#include <stdio.h>
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void uip_log(char *msg);
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#define UIP_LOG(m) uip_log(m)
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#else
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#define UIP_LOG(m)
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#endif /* UIP_LOGGING == 1 */
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/** Remove a neighbor cache entry */
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#define uip_nd6_nbrcache_rm(neighbor) do { \
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PRINTF("Removing neighbor with ip addr"); \
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PRINT6ADDR(&neighbor->ipaddr); \
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PRINTF("\n"); \
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neighbor->used = 0; \
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} while(0)
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/**
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* \brief Timer for maintenance of neighbor cache, prefix list, and default
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* router lists
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*/
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struct etimer uip_nd6_timer_periodic;
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/** \brief Neighor cache */
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static struct uip_nd6_neighbor uip_nd6_nbrcache_list[UIP_CONF_ND6_MAX_NEIGHBORS];
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/** \brief Default router list */
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static struct uip_nd6_defrouter uip_nd6_defrouter_list[UIP_CONF_ND6_MAX_DEFROUTERS];
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/** \brief Prefix list */
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static struct uip_nd6_prefix uip_nd6_prefix_list[UIP_CONF_ND6_MAX_PREFIXES];
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/** \name Temp variables*/
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/** @{*/
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static u8_t i;
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static struct uip_nd6_prefix *prefix;
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static struct uip_nd6_neighbor *neighbor;
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static struct uip_nd6_defrouter *router;
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/** @}*/
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void
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uip_nd6_init(void)
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{
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/* INITIALIZE NEIGHBOR DISCOVERY*/
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for(i = 0; i < UIP_CONF_ND6_MAX_NEIGHBORS; i ++) {
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uip_nd6_nbrcache_list[i].used = 0;
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}
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for(i = 0; i < UIP_CONF_ND6_MAX_DEFROUTERS; i ++) {
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uip_nd6_defrouter_list[i].used = 0;
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}
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for(i = 0; i < UIP_CONF_ND6_MAX_PREFIXES; i ++) {
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uip_nd6_prefix_list[i].used = 0;
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}
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/* create link local prefix */
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uip_ip6addr(&(uip_nd6_prefix_list[0].ipaddr), 0xfe80, 0, 0, 0, 0, 0, 0, 0);
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uip_nd6_prefix_list[0].length = UIP_DEFAULT_PREFIX_LEN;
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uip_nd6_prefix_list[0].used = 1;
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uip_nd6_prefix_list[0].is_infinite = 1;
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/* we check the ND structures every 100ms */
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etimer_set(&uip_nd6_timer_periodic, 0.1 * CLOCK_SECOND);
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}
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struct uip_nd6_neighbor *
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uip_nd6_nbrcache_lookup(uip_ipaddr_t *ipaddr)
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{
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neighbor = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_NEIGHBORS; i ++) {
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if(uip_nd6_nbrcache_list[i].used == 0) {
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continue;
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}
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if(uip_ipaddr_cmp(&uip_nd6_nbrcache_list[i].ipaddr, ipaddr)) {
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neighbor = &uip_nd6_nbrcache_list[i];
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break;
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}
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}
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return neighbor;
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}
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struct uip_nd6_neighbor *
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uip_nd6_nbrcache_add(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr,
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u8_t isrouter, uip_neighbor_state state)
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{
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neighbor = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_NEIGHBORS; ++i) {
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if(uip_nd6_nbrcache_list[i].used == 0) {
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break;
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}
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}
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if(i == UIP_CONF_ND6_MAX_NEIGHBORS){
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i = (u8_t)(random_rand()%UIP_CONF_ND6_MAX_NEIGHBORS);
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UIP_LOG("CACHE FULL");
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}
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neighbor = &(uip_nd6_nbrcache_list[i]);
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uip_ipaddr_copy(&(neighbor->ipaddr), ipaddr);
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if(lladdr != NULL){
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memcpy(&(neighbor->lladdr), lladdr, UIP_LLADDR_LEN);
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} else {
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memset(&(neighbor->lladdr), 0, UIP_LLADDR_LEN);
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}
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PRINTF("Adding neighbor with ip addr");
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PRINT6ADDR(ipaddr);
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PRINTF("link addr");
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PRINTLLADDR((&(neighbor->lladdr)));
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PRINTF("state %d\n", state);
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neighbor->isrouter = isrouter;
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neighbor->state = state;
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/* timers are set separately, for now we put them in expired state */
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timer_set(&(neighbor->reachable),0);
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timer_set(&(neighbor->last_send),0);
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neighbor->count_send = 0;
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neighbor->used = 1;
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return neighbor;
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}
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struct uip_nd6_defrouter *
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uip_nd6_defrouter_lookup(struct uip_nd6_neighbor *neighbor)
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{
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router = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_DEFROUTERS; i ++) {
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if(uip_nd6_defrouter_list[i].used == 0) {
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continue;
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}
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if(uip_nd6_defrouter_list[i].nb == neighbor) {
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router = &uip_nd6_defrouter_list[i];
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break;
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}
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}
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return router;
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}
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struct uip_nd6_defrouter *
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uip_nd6_choose_defrouter(void)
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{
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router = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_DEFROUTERS; i ++) {
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if(uip_nd6_defrouter_list[i].used == 0) {
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continue;
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}
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if(uip_nd6_defrouter_list[i].nb == NULL){
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continue;
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}
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if(uip_nd6_defrouter_list[i].nb->state == INCOMPLETE ||
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uip_nd6_defrouter_list[i].nb->state == NO_STATE){
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if(router == NULL)
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router = &(uip_nd6_defrouter_list[i]);
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} else {
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router = &(uip_nd6_defrouter_list[i]);
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break;
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}
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}
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return router;
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}
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void
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uip_nd6_defrouter_rm(struct uip_nd6_defrouter *router)
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{
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PRINTF("Removing defrouter with ip addr");
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PRINT6ADDR(&((router->nb)->ipaddr));
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PRINTF("\n");
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router->used = 0;
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if(((router->nb)->state) == NO_STATE){
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/* Also remove the corresponding neighbor cache entry */
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uip_nd6_nbrcache_rm(router->nb);
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}
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}
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struct uip_nd6_defrouter *
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uip_nd6_defrouter_add(struct uip_nd6_neighbor *neighbor, clock_time_t interval)
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{
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router = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_DEFROUTERS; ++i) {
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if(uip_nd6_defrouter_list[i].used == 0) {
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break;
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}
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}
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if(i == UIP_CONF_ND6_MAX_DEFROUTERS){
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UIP_LOG("Defrouter list full");
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i = (u8_t)(random_rand()%UIP_CONF_ND6_MAX_DEFROUTERS);
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}
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router = &(uip_nd6_defrouter_list[i]);
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router->nb = neighbor;
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PRINTF("Adding defrouter with ip addr");
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PRINT6ADDR(&neighbor->ipaddr);
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PRINTF("\n");
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timer_set(&(router->lifetime),interval);
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uip_nd6_defrouter_list[i].used = 1;
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return router;
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}
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u8_t
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uip_nd6_is_addr_onlink(uip_ipaddr_t *ipaddr)
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{
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for(i = 0; i < UIP_CONF_ND6_MAX_PREFIXES; i ++) {
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if(uip_nd6_prefix_list[i].used == 0){
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continue;
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}
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if(uip_ipaddr_prefixcmp(&uip_nd6_prefix_list[i].ipaddr,
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ipaddr, uip_nd6_prefix_list[i].length)){
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return 1;
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}
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}
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return 0;
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}
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struct uip_nd6_prefix *
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uip_nd6_prefix_lookup(uip_ipaddr_t *ipaddr)
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{
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prefix = NULL;
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for (i = 0; i < UIP_CONF_ND6_MAX_PREFIXES; i ++) {
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if (uip_nd6_prefix_list[i].used == 0){
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continue;
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}
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if (uip_ipaddr_cmp(&uip_nd6_prefix_list[i].ipaddr, ipaddr)) {
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prefix = &uip_nd6_prefix_list[i];
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break;
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}
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}
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return prefix;
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}
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struct uip_nd6_prefix *
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uip_nd6_prefix_add(uip_ipaddr_t *ipaddr, u8_t length, clock_time_t interval){
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prefix = NULL;
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/*
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* we start at 1: we do not want to overwrite the link local
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* prefix
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*/
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for(i = 1; i < UIP_CONF_ND6_MAX_PREFIXES; ++i) {
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if(uip_nd6_prefix_list[i].used == 0) {
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break;
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}
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}
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if(i == UIP_CONF_ND6_MAX_PREFIXES){
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UIP_LOG("Prefix list full");
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/*
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* we do not want it to pick the first entry, which
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* is the link local prefix
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*/
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i = (u8_t)(random_rand()%(UIP_CONF_ND6_MAX_PREFIXES -1) + 1);
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PRINTF("Prefix list full, picking index %x\n\n", i);
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}
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prefix = &(uip_nd6_prefix_list[i]);
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uip_ipaddr_copy(&(prefix->ipaddr), ipaddr);
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prefix->length = length;
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PRINTF("Adding prefix ");
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PRINT6ADDR(&prefix->ipaddr);
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PRINTF("length %d, vlifetime * CLOCK_SECOND %d\n", length, (u16_t)interval);
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if(interval != 0){
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timer_set(&(prefix->vlifetime),interval);
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prefix->is_infinite = 0;
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} else {
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prefix->is_infinite = 1;
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}
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uip_nd6_prefix_list[i].used = 1;
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return prefix;
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}
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void uip_nd6_prefix_rm(struct uip_nd6_prefix *prefix) {
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PRINTF("Removing prefix ");
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PRINT6ADDR(&prefix->ipaddr);
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PRINTF("length %d\n", prefix->length);
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prefix->used = 0;
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}
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void
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uip_nd6_periodic(void)
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{
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etimer_reset(&uip_nd6_timer_periodic);
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/*PERIODIC PROCESSING FOR DEFAULT ROUTER LIST*/
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router = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_DEFROUTERS; i ++) {
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if(uip_nd6_defrouter_list[i].used == 1) {
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router = &(uip_nd6_defrouter_list[i]);
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/* XXX when run on a platform with a 16-bit clock_time_t, the
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timer_expired() below causes the default route to be immediately
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be removed causing communucation problems. We comment it out as
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a quick-fix to this problem on the Atmel RAven platform, but
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since this is needed for IPv6 compliance, we will solve the
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problem by making clock_time_t 32 bits instead after the uIPv6
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snapshot release.
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if(timer_expired(&(router->lifetime))) {
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uip_nd6_defrouter_rm(router);
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}
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*/
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}
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}
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/*PERIODIC PROCESSING FOR NEIGHBOR CACHE*/
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neighbor = NULL;
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for(i = 0; i < UIP_CONF_ND6_MAX_NEIGHBORS; i ++) {
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if(uip_nd6_nbrcache_list[i].used == 1) {
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neighbor = &(uip_nd6_nbrcache_list[i]);
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switch (neighbor->state) {
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case INCOMPLETE:
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if(neighbor->count_send >= UIP_ND6_MAX_MULTICAST_SOLICIT) {
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uip_nd6_nbrcache_list[i].used = 0;
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}
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else if(timer_expired(&(neighbor->last_send))) {
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PRINTF("INCOMPLETE: NS %d\n",neighbor->count_send+1);
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uip_nd6_io_ns_output(NULL, NULL, &neighbor->ipaddr);
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timer_set(&(neighbor->last_send),
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uip_netif_physical_if.retrans_timer/1000*CLOCK_SECOND);
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neighbor->count_send++;
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}
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break;
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case REACHABLE:
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if(timer_expired(&(neighbor->reachable))) {
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PRINTF("REACHABLE: moving to STALE (");
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PRINT6ADDR(&neighbor->ipaddr);
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PRINTF(")\n");
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neighbor->state = STALE;
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neighbor->count_send = 0;
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}
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break;
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case DELAY:
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if(timer_expired(&(neighbor->reachable))) {
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neighbor->state = PROBE;
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neighbor->count_send = 0;
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PRINTF("DELAY: moving to PROBE + NS %d\n", neighbor->count_send+1);
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uip_nd6_io_ns_output(NULL, &neighbor->ipaddr, &neighbor->ipaddr);
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timer_set(&(neighbor->last_send),
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uip_netif_physical_if.retrans_timer/1000*CLOCK_SECOND);
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neighbor->count_send++;
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}
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break;
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case PROBE:
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if(neighbor->count_send >= UIP_ND6_MAX_UNICAST_SOLICIT) {
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PRINTF("PROBE END \n");
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neighbor->count_send = 0;
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/* remove any corresponding default router (if any)*/
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router = uip_nd6_defrouter_lookup(neighbor);
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if(router != NULL)
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uip_nd6_defrouter_rm(router);
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/* remove neighbor cache entry */
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uip_nd6_nbrcache_rm(neighbor);
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continue;
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}
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if(timer_expired(&(neighbor->last_send))){
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PRINTF("PROBE: NS %d\n",neighbor->count_send+1);
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uip_nd6_io_ns_output(NULL, &neighbor->ipaddr, &neighbor->ipaddr);
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timer_set(&(neighbor->last_send),
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uip_netif_physical_if.retrans_timer/1000*CLOCK_SECOND);
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neighbor->count_send++;
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}
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break;
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default:
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break;
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}
|
|
}
|
|
}
|
|
/*PERIODIC PROCESSING FOR PREFIX LIST*/
|
|
prefix = NULL;
|
|
/*
|
|
* we start with i=1 because the first prefix is the link-local prefix
|
|
* and therefore has INFINITE an lifetime
|
|
*/
|
|
for(i = 1; i < UIP_CONF_ND6_MAX_PREFIXES; i ++) {
|
|
if(uip_nd6_prefix_list[i].used == 1) {
|
|
prefix = &(uip_nd6_prefix_list[i]);
|
|
if((prefix->is_infinite == 0) &&
|
|
(timer_expired(&(prefix->vlifetime)))) {
|
|
/* remove prefix */
|
|
uip_nd6_prefix_rm(prefix);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/** @} */
|