/**
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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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* IPv6 data structures handling functions.
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* Comprises part of the Neighbor discovery (RFC 4861)
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* and auto configuration (RFC 4862) state machines.
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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) 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 <string.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include "lib/random.h"
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#include "net/uip-nd6.h"
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#include "net/uip-ds6.h"
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#include "net/uip-packetqueue.h"
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#if UIP_CONF_IPV6
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#define DEBUG DEBUG_NONE
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#include "net/uip-debug.h"
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struct etimer uip_ds6_timer_periodic; /** \brief Timer for maintenance of data structures */
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#if UIP_CONF_ROUTER
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struct stimer uip_ds6_timer_ra; /** \brief RA timer, to schedule RA sending */
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#if UIP_ND6_SEND_RA
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static uint8_t racount; /** \brief number of RA already sent */
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static uint16_t rand_time; /** \brief random time value for timers */
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#endif
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#else /* UIP_CONF_ROUTER */
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struct etimer uip_ds6_timer_rs; /** \brief RS timer, to schedule RS sending */
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static uint8_t rscount; /** \brief number of rs already sent */
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#endif /* UIP_CONF_ROUTER */
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/** \name "DS6" Data structures */
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/** @{ */
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uip_ds6_netif_t uip_ds6_if; /** \brief The single interface */
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uip_ds6_prefix_t uip_ds6_prefix_list[UIP_DS6_PREFIX_NB]; /** \brief Prefix list */
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/* Used by Cooja to enable extraction of addresses from memory.*/
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uint8_t uip_ds6_addr_size;
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uint8_t uip_ds6_netif_addr_list_offset;
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/** @} */
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/* "full" (as opposed to pointer) ip address used in this file, */
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static uip_ipaddr_t loc_fipaddr;
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/* Pointers used in this file */
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static uip_ds6_addr_t *locaddr;
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static uip_ds6_maddr_t *locmaddr;
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static uip_ds6_aaddr_t *locaaddr;
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static uip_ds6_prefix_t *locprefix;
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/*---------------------------------------------------------------------------*/
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void
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uip_ds6_init(void)
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{
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uip_ds6_neighbors_init();
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uip_ds6_route_init();
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PRINTF("Init of IPv6 data structures\n");
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PRINTF("%u neighbors\n%u default routers\n%u prefixes\n%u routes\n%u unicast addresses\n%u multicast addresses\n%u anycast addresses\n",
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NBR_TABLE_MAX_NEIGHBORS, UIP_DS6_DEFRT_NB, UIP_DS6_PREFIX_NB, UIP_DS6_ROUTE_NB,
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UIP_DS6_ADDR_NB, UIP_DS6_MADDR_NB, UIP_DS6_AADDR_NB);
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memset(uip_ds6_prefix_list, 0, sizeof(uip_ds6_prefix_list));
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memset(&uip_ds6_if, 0, sizeof(uip_ds6_if));
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uip_ds6_addr_size = sizeof(struct uip_ds6_addr);
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uip_ds6_netif_addr_list_offset = offsetof(struct uip_ds6_netif, addr_list);
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/* Set interface parameters */
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uip_ds6_if.link_mtu = UIP_LINK_MTU;
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uip_ds6_if.cur_hop_limit = UIP_TTL;
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uip_ds6_if.base_reachable_time = UIP_ND6_REACHABLE_TIME;
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uip_ds6_if.reachable_time = uip_ds6_compute_reachable_time();
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uip_ds6_if.retrans_timer = UIP_ND6_RETRANS_TIMER;
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uip_ds6_if.maxdadns = UIP_ND6_DEF_MAXDADNS;
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/* Create link local address, prefix, multicast addresses, anycast addresses */
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uip_create_linklocal_prefix(&loc_fipaddr);
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#if UIP_CONF_ROUTER
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uip_ds6_prefix_add(&loc_fipaddr, UIP_DEFAULT_PREFIX_LEN, 0, 0, 0, 0);
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#else /* UIP_CONF_ROUTER */
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uip_ds6_prefix_add(&loc_fipaddr, UIP_DEFAULT_PREFIX_LEN, 0);
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#endif /* UIP_CONF_ROUTER */
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uip_ds6_set_addr_iid(&loc_fipaddr, &uip_lladdr);
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uip_ds6_addr_add(&loc_fipaddr, 0, ADDR_AUTOCONF);
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uip_create_linklocal_allnodes_mcast(&loc_fipaddr);
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uip_ds6_maddr_add(&loc_fipaddr);
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#if UIP_CONF_ROUTER
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uip_create_linklocal_allrouters_mcast(&loc_fipaddr);
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uip_ds6_maddr_add(&loc_fipaddr);
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#if UIP_ND6_SEND_RA
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stimer_set(&uip_ds6_timer_ra, 2); /* wait to have a link local IP address */
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#endif /* UIP_ND6_SEND_RA */
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#else /* UIP_CONF_ROUTER */
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etimer_set(&uip_ds6_timer_rs,
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random_rand() % (UIP_ND6_MAX_RTR_SOLICITATION_DELAY *
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CLOCK_SECOND));
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#endif /* UIP_CONF_ROUTER */
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etimer_set(&uip_ds6_timer_periodic, UIP_DS6_PERIOD);
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return;
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}
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|
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/*---------------------------------------------------------------------------*/
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void
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uip_ds6_periodic(void)
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{
|
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/* Periodic processing on unicast addresses */
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for(locaddr = uip_ds6_if.addr_list;
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locaddr < uip_ds6_if.addr_list + UIP_DS6_ADDR_NB; locaddr++) {
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if(locaddr->isused) {
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if((!locaddr->isinfinite) && (stimer_expired(&locaddr->vlifetime))) {
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uip_ds6_addr_rm(locaddr);
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#if UIP_ND6_DEF_MAXDADNS > 0
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} else if((locaddr->state == ADDR_TENTATIVE)
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&& (locaddr->dadnscount <= uip_ds6_if.maxdadns)
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&& (timer_expired(&locaddr->dadtimer))
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&& (uip_len == 0)) {
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uip_ds6_dad(locaddr);
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#endif /* UIP_ND6_DEF_MAXDADNS > 0 */
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}
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}
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}
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/* Periodic processing on default routers */
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uip_ds6_defrt_periodic();
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/* for(locdefrt = uip_ds6_defrt_list;
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locdefrt < uip_ds6_defrt_list + UIP_DS6_DEFRT_NB; locdefrt++) {
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if((locdefrt->isused) && (!locdefrt->isinfinite) &&
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(stimer_expired(&(locdefrt->lifetime)))) {
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uip_ds6_defrt_rm(locdefrt);
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}
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}*/
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#if !UIP_CONF_ROUTER
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/* Periodic processing on prefixes */
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for(locprefix = uip_ds6_prefix_list;
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locprefix < uip_ds6_prefix_list + UIP_DS6_PREFIX_NB;
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locprefix++) {
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if(locprefix->isused && !locprefix->isinfinite
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&& stimer_expired(&(locprefix->vlifetime))) {
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uip_ds6_prefix_rm(locprefix);
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}
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}
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#endif /* !UIP_CONF_ROUTER */
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uip_ds6_neighbor_periodic();
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#if UIP_CONF_ROUTER & UIP_ND6_SEND_RA
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/* Periodic RA sending */
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if(stimer_expired(&uip_ds6_timer_ra) && (uip_len == 0)) {
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uip_ds6_send_ra_periodic();
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}
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#endif /* UIP_CONF_ROUTER & UIP_ND6_SEND_RA */
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etimer_reset(&uip_ds6_timer_periodic);
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return;
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}
|
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/*---------------------------------------------------------------------------*/
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uint8_t
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uip_ds6_list_loop(uip_ds6_element_t *list, uint8_t size,
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uint16_t elementsize, uip_ipaddr_t *ipaddr,
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uint8_t ipaddrlen, uip_ds6_element_t **out_element)
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{
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uip_ds6_element_t *element;
|
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*out_element = NULL;
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for(element = list;
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element <
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(uip_ds6_element_t *)((uint8_t *)list + (size * elementsize));
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element = (uip_ds6_element_t *)((uint8_t *)element + elementsize)) {
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if(element->isused) {
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if(uip_ipaddr_prefixcmp(&element->ipaddr, ipaddr, ipaddrlen)) {
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*out_element = element;
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return FOUND;
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}
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} else {
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*out_element = element;
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}
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}
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return *out_element != NULL ? FREESPACE : NOSPACE;
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}
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/*---------------------------------------------------------------------------*/
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#if UIP_CONF_ROUTER
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/*---------------------------------------------------------------------------*/
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uip_ds6_prefix_t *
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uip_ds6_prefix_add(uip_ipaddr_t *ipaddr, uint8_t ipaddrlen,
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uint8_t advertise, uint8_t flags, unsigned long vtime,
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unsigned long ptime)
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{
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if(uip_ds6_list_loop
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((uip_ds6_element_t *)uip_ds6_prefix_list, UIP_DS6_PREFIX_NB,
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sizeof(uip_ds6_prefix_t), ipaddr, ipaddrlen,
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(uip_ds6_element_t **)&locprefix) == FREESPACE) {
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locprefix->isused = 1;
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uip_ipaddr_copy(&locprefix->ipaddr, ipaddr);
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locprefix->length = ipaddrlen;
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locprefix->advertise = advertise;
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locprefix->l_a_reserved = flags;
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locprefix->vlifetime = vtime;
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locprefix->plifetime = ptime;
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PRINTF("Adding prefix ");
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PRINT6ADDR(&locprefix->ipaddr);
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PRINTF("length %u, flags %x, Valid lifetime %lx, Preffered lifetime %lx\n",
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ipaddrlen, flags, vtime, ptime);
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return locprefix;
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} else {
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PRINTF("No more space in Prefix list\n");
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}
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return NULL;
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}
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|
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#else /* UIP_CONF_ROUTER */
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uip_ds6_prefix_t *
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uip_ds6_prefix_add(uip_ipaddr_t *ipaddr, uint8_t ipaddrlen,
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unsigned long interval)
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{
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if(uip_ds6_list_loop
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((uip_ds6_element_t *)uip_ds6_prefix_list, UIP_DS6_PREFIX_NB,
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sizeof(uip_ds6_prefix_t), ipaddr, ipaddrlen,
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(uip_ds6_element_t **)&locprefix) == FREESPACE) {
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locprefix->isused = 1;
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uip_ipaddr_copy(&locprefix->ipaddr, ipaddr);
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locprefix->length = ipaddrlen;
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if(interval != 0) {
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stimer_set(&(locprefix->vlifetime), interval);
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locprefix->isinfinite = 0;
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} else {
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locprefix->isinfinite = 1;
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}
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PRINTF("Adding prefix ");
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PRINT6ADDR(&locprefix->ipaddr);
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PRINTF("length %u, vlifetime%lu\n", ipaddrlen, interval);
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}
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return NULL;
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}
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#endif /* UIP_CONF_ROUTER */
|
|
/*---------------------------------------------------------------------------*/
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void
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uip_ds6_prefix_rm(uip_ds6_prefix_t *prefix)
|
{
|
if(prefix != NULL) {
|
prefix->isused = 0;
|
}
|
return;
|
}
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_prefix_t *
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uip_ds6_prefix_lookup(uip_ipaddr_t *ipaddr, uint8_t ipaddrlen)
|
{
|
if(uip_ds6_list_loop((uip_ds6_element_t *)uip_ds6_prefix_list,
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UIP_DS6_PREFIX_NB, sizeof(uip_ds6_prefix_t),
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ipaddr, ipaddrlen,
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(uip_ds6_element_t **)&locprefix) == FOUND) {
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return locprefix;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uint8_t
|
uip_ds6_is_addr_onlink(uip_ipaddr_t *ipaddr)
|
{
|
for(locprefix = uip_ds6_prefix_list;
|
locprefix < uip_ds6_prefix_list + UIP_DS6_PREFIX_NB; locprefix++) {
|
if(locprefix->isused &&
|
uip_ipaddr_prefixcmp(&locprefix->ipaddr, ipaddr, locprefix->length)) {
|
return 1;
|
}
|
}
|
return 0;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_addr_t *
|
uip_ds6_addr_add(uip_ipaddr_t *ipaddr, unsigned long vlifetime, uint8_t type)
|
{
|
if(uip_ds6_list_loop
|
((uip_ds6_element_t *)uip_ds6_if.addr_list, UIP_DS6_ADDR_NB,
|
sizeof(uip_ds6_addr_t), ipaddr, 128,
|
(uip_ds6_element_t **)&locaddr) == FREESPACE) {
|
locaddr->isused = 1;
|
uip_ipaddr_copy(&locaddr->ipaddr, ipaddr);
|
locaddr->type = type;
|
if(vlifetime == 0) {
|
locaddr->isinfinite = 1;
|
} else {
|
locaddr->isinfinite = 0;
|
stimer_set(&(locaddr->vlifetime), vlifetime);
|
}
|
#if UIP_ND6_DEF_MAXDADNS > 0
|
locaddr->state = ADDR_TENTATIVE;
|
timer_set(&locaddr->dadtimer,
|
random_rand() % (UIP_ND6_MAX_RTR_SOLICITATION_DELAY *
|
CLOCK_SECOND));
|
locaddr->dadnscount = 0;
|
#else /* UIP_ND6_DEF_MAXDADNS > 0 */
|
locaddr->state = ADDR_PREFERRED;
|
#endif /* UIP_ND6_DEF_MAXDADNS > 0 */
|
uip_create_solicited_node(ipaddr, &loc_fipaddr);
|
uip_ds6_maddr_add(&loc_fipaddr);
|
return locaddr;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_addr_rm(uip_ds6_addr_t *addr)
|
{
|
if(addr != NULL) {
|
uip_create_solicited_node(&addr->ipaddr, &loc_fipaddr);
|
if((locmaddr = uip_ds6_maddr_lookup(&loc_fipaddr)) != NULL) {
|
uip_ds6_maddr_rm(locmaddr);
|
}
|
addr->isused = 0;
|
}
|
return;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_addr_t *
|
uip_ds6_addr_lookup(uip_ipaddr_t *ipaddr)
|
{
|
if(uip_ds6_list_loop
|
((uip_ds6_element_t *)uip_ds6_if.addr_list, UIP_DS6_ADDR_NB,
|
sizeof(uip_ds6_addr_t), ipaddr, 128,
|
(uip_ds6_element_t **)&locaddr) == FOUND) {
|
return locaddr;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
/*
|
* get a link local address -
|
* state = -1 => any address is ok. Otherwise state = desired state of addr.
|
* (TENTATIVE, PREFERRED, DEPRECATED)
|
*/
|
uip_ds6_addr_t *
|
uip_ds6_get_link_local(int8_t state)
|
{
|
for(locaddr = uip_ds6_if.addr_list;
|
locaddr < uip_ds6_if.addr_list + UIP_DS6_ADDR_NB; locaddr++) {
|
if(locaddr->isused && (state == -1 || locaddr->state == state)
|
&& (uip_is_addr_link_local(&locaddr->ipaddr))) {
|
return locaddr;
|
}
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
/*
|
* get a global address -
|
* state = -1 => any address is ok. Otherwise state = desired state of addr.
|
* (TENTATIVE, PREFERRED, DEPRECATED)
|
*/
|
uip_ds6_addr_t *
|
uip_ds6_get_global(int8_t state)
|
{
|
for(locaddr = uip_ds6_if.addr_list;
|
locaddr < uip_ds6_if.addr_list + UIP_DS6_ADDR_NB; locaddr++) {
|
if(locaddr->isused && (state == -1 || locaddr->state == state)
|
&& !(uip_is_addr_link_local(&locaddr->ipaddr))) {
|
return locaddr;
|
}
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_maddr_t *
|
uip_ds6_maddr_add(const uip_ipaddr_t *ipaddr)
|
{
|
if(uip_ds6_list_loop
|
((uip_ds6_element_t *)uip_ds6_if.maddr_list, UIP_DS6_MADDR_NB,
|
sizeof(uip_ds6_maddr_t), (void*)ipaddr, 128,
|
(uip_ds6_element_t **)&locmaddr) == FREESPACE) {
|
locmaddr->isused = 1;
|
uip_ipaddr_copy(&locmaddr->ipaddr, ipaddr);
|
return locmaddr;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_maddr_rm(uip_ds6_maddr_t *maddr)
|
{
|
if(maddr != NULL) {
|
maddr->isused = 0;
|
}
|
return;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_maddr_t *
|
uip_ds6_maddr_lookup(const uip_ipaddr_t *ipaddr)
|
{
|
if(uip_ds6_list_loop
|
((uip_ds6_element_t *)uip_ds6_if.maddr_list, UIP_DS6_MADDR_NB,
|
sizeof(uip_ds6_maddr_t), (void*)ipaddr, 128,
|
(uip_ds6_element_t **)&locmaddr) == FOUND) {
|
return locmaddr;
|
}
|
return NULL;
|
}
|
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_aaddr_t *
|
uip_ds6_aaddr_add(uip_ipaddr_t *ipaddr)
|
{
|
if(uip_ds6_list_loop
|
((uip_ds6_element_t *)uip_ds6_if.aaddr_list, UIP_DS6_AADDR_NB,
|
sizeof(uip_ds6_aaddr_t), ipaddr, 128,
|
(uip_ds6_element_t **)&locaaddr) == FREESPACE) {
|
locaaddr->isused = 1;
|
uip_ipaddr_copy(&locaaddr->ipaddr, ipaddr);
|
return locaaddr;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_aaddr_rm(uip_ds6_aaddr_t *aaddr)
|
{
|
if(aaddr != NULL) {
|
aaddr->isused = 0;
|
}
|
return;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uip_ds6_aaddr_t *
|
uip_ds6_aaddr_lookup(uip_ipaddr_t *ipaddr)
|
{
|
if(uip_ds6_list_loop((uip_ds6_element_t *)uip_ds6_if.aaddr_list,
|
UIP_DS6_AADDR_NB, sizeof(uip_ds6_aaddr_t), ipaddr, 128,
|
(uip_ds6_element_t **)&locaaddr) == FOUND) {
|
return locaaddr;
|
}
|
return NULL;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_select_src(uip_ipaddr_t *src, uip_ipaddr_t *dst)
|
{
|
uint8_t best = 0; /* number of bit in common with best match */
|
uint8_t n = 0;
|
uip_ds6_addr_t *matchaddr = NULL;
|
|
if(!uip_is_addr_link_local(dst) && !uip_is_addr_mcast(dst)) {
|
/* find longest match */
|
for(locaddr = uip_ds6_if.addr_list;
|
locaddr < uip_ds6_if.addr_list + UIP_DS6_ADDR_NB; locaddr++) {
|
/* Only preferred global (not link-local) addresses */
|
if(locaddr->isused && locaddr->state == ADDR_PREFERRED &&
|
!uip_is_addr_link_local(&locaddr->ipaddr)) {
|
n = get_match_length(dst, &locaddr->ipaddr);
|
if(n >= best) {
|
best = n;
|
matchaddr = locaddr;
|
}
|
}
|
}
|
} else {
|
matchaddr = uip_ds6_get_link_local(ADDR_PREFERRED);
|
}
|
|
/* use the :: (unspecified address) as source if no match found */
|
if(matchaddr == NULL) {
|
uip_create_unspecified(src);
|
} else {
|
uip_ipaddr_copy(src, &matchaddr->ipaddr);
|
}
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_set_addr_iid(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr)
|
{
|
/* We consider only links with IEEE EUI-64 identifier or
|
* IEEE 48-bit MAC addresses */
|
#if (UIP_LLADDR_LEN == 8)
|
memcpy(ipaddr->u8 + 8, lladdr, UIP_LLADDR_LEN);
|
ipaddr->u8[8] ^= 0x02;
|
#elif (UIP_LLADDR_LEN == 6)
|
memcpy(ipaddr->u8 + 8, lladdr, 3);
|
ipaddr->u8[11] = 0xff;
|
ipaddr->u8[12] = 0xfe;
|
memcpy(ipaddr->u8 + 13, (uint8_t *)lladdr + 3, 3);
|
ipaddr->u8[8] ^= 0x02;
|
#else
|
#error uip-ds6.c cannot build interface address when UIP_LLADDR_LEN is not 6 or 8
|
#endif
|
}
|
|
/*---------------------------------------------------------------------------*/
|
uint8_t
|
get_match_length(uip_ipaddr_t *src, uip_ipaddr_t *dst)
|
{
|
uint8_t j, k, x_or;
|
uint8_t len = 0;
|
|
for(j = 0; j < 16; j++) {
|
if(src->u8[j] == dst->u8[j]) {
|
len += 8;
|
} else {
|
x_or = src->u8[j] ^ dst->u8[j];
|
for(k = 0; k < 8; k++) {
|
if((x_or & 0x80) == 0) {
|
len++;
|
x_or <<= 1;
|
} else {
|
break;
|
}
|
}
|
break;
|
}
|
}
|
return len;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
#if UIP_ND6_DEF_MAXDADNS > 0
|
void
|
uip_ds6_dad(uip_ds6_addr_t *addr)
|
{
|
/* send maxdadns NS for DAD */
|
if(addr->dadnscount < uip_ds6_if.maxdadns) {
|
uip_nd6_ns_output(NULL, NULL, &addr->ipaddr);
|
addr->dadnscount++;
|
timer_set(&addr->dadtimer,
|
uip_ds6_if.retrans_timer / 1000 * CLOCK_SECOND);
|
return;
|
}
|
/*
|
* If we arrive here it means DAD succeeded, otherwise the dad process
|
* would have been interrupted in ds6_dad_ns/na_input
|
*/
|
PRINTF("DAD succeeded, ipaddr:");
|
PRINT6ADDR(&addr->ipaddr);
|
PRINTF("\n");
|
|
addr->state = ADDR_PREFERRED;
|
return;
|
}
|
|
/*---------------------------------------------------------------------------*/
|
/*
|
* Calling code must handle when this returns 0 (e.g. link local
|
* address can not be used).
|
*/
|
int
|
uip_ds6_dad_failed(uip_ds6_addr_t *addr)
|
{
|
if(uip_is_addr_link_local(&addr->ipaddr)) {
|
PRINTF("Contiki shutdown, DAD for link local address failed\n");
|
return 0;
|
}
|
uip_ds6_addr_rm(addr);
|
return 1;
|
}
|
#endif /*UIP_ND6_DEF_MAXDADNS > 0 */
|
|
/*---------------------------------------------------------------------------*/
|
#if UIP_CONF_ROUTER
|
#if UIP_ND6_SEND_RA
|
void
|
uip_ds6_send_ra_sollicited(void)
|
{
|
/* We have a pb here: RA timer max possible value is 1800s,
|
* hence we have to use stimers. However, when receiving a RS, we
|
* should delay the reply by a random value between 0 and 500ms timers.
|
* stimers are in seconds, hence we cannot do this. Therefore we just send
|
* the RA (setting the timer to 0 below). We keep the code logic for
|
* the days contiki will support appropriate timers */
|
rand_time = 0;
|
PRINTF("Solicited RA, random time %u\n", rand_time);
|
|
if(stimer_remaining(&uip_ds6_timer_ra) > rand_time) {
|
if(stimer_elapsed(&uip_ds6_timer_ra) < UIP_ND6_MIN_DELAY_BETWEEN_RAS) {
|
/* Ensure that the RAs are rate limited */
|
/* stimer_set(&uip_ds6_timer_ra, rand_time +
|
UIP_ND6_MIN_DELAY_BETWEEN_RAS -
|
stimer_elapsed(&uip_ds6_timer_ra));
|
*/ } else {
|
stimer_set(&uip_ds6_timer_ra, rand_time);
|
}
|
}
|
}
|
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_send_ra_periodic(void)
|
{
|
if(racount > 0) {
|
/* send previously scheduled RA */
|
uip_nd6_ra_output(NULL);
|
PRINTF("Sending periodic RA\n");
|
}
|
|
rand_time = UIP_ND6_MIN_RA_INTERVAL + random_rand() %
|
(uint16_t) (UIP_ND6_MAX_RA_INTERVAL - UIP_ND6_MIN_RA_INTERVAL);
|
PRINTF("Random time 1 = %u\n", rand_time);
|
|
if(racount < UIP_ND6_MAX_INITIAL_RAS) {
|
if(rand_time > UIP_ND6_MAX_INITIAL_RA_INTERVAL) {
|
rand_time = UIP_ND6_MAX_INITIAL_RA_INTERVAL;
|
PRINTF("Random time 2 = %u\n", rand_time);
|
}
|
racount++;
|
}
|
PRINTF("Random time 3 = %u\n", rand_time);
|
stimer_set(&uip_ds6_timer_ra, rand_time);
|
}
|
|
#endif /* UIP_ND6_SEND_RA */
|
#else /* UIP_CONF_ROUTER */
|
/*---------------------------------------------------------------------------*/
|
void
|
uip_ds6_send_rs(void)
|
{
|
if((uip_ds6_defrt_choose() == NULL)
|
&& (rscount < UIP_ND6_MAX_RTR_SOLICITATIONS)) {
|
PRINTF("Sending RS %u\n", rscount);
|
uip_nd6_rs_output();
|
rscount++;
|
etimer_set(&uip_ds6_timer_rs,
|
UIP_ND6_RTR_SOLICITATION_INTERVAL * CLOCK_SECOND);
|
} else {
|
PRINTF("Router found ? (boolean): %u\n",
|
(uip_ds6_defrt_choose() != NULL));
|
etimer_stop(&uip_ds6_timer_rs);
|
}
|
return;
|
}
|
|
#endif /* UIP_CONF_ROUTER */
|
/*---------------------------------------------------------------------------*/
|
uint32_t
|
uip_ds6_compute_reachable_time(void)
|
{
|
return (uint32_t) (UIP_ND6_MIN_RANDOM_FACTOR
|
(uip_ds6_if.base_reachable_time)) +
|
((uint16_t) (random_rand() << 8) +
|
(uint16_t) random_rand()) %
|
(uint32_t) (UIP_ND6_MAX_RANDOM_FACTOR(uip_ds6_if.base_reachable_time) -
|
UIP_ND6_MIN_RANDOM_FACTOR(uip_ds6_if.base_reachable_time));
|
}
|
/*---------------------------------------------------------------------------*/
|
/** @} */
|
#endif /* UIP_CONF_IPV6 */
|
