269 lines
8.9 KiB
C
269 lines
8.9 KiB
C
/*
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* Copyright (c) 2009, 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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/**
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* \addtogroup rpl-lite
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* @{
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*
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* \file
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* ContikiRPL, an implementation of RPL: IPv6 Routing Protocol
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* for Low-Power and Lossy Networks (IETF RFC 6550)
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*
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* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
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* Simon Duquennoy <simon.duquennoy@inria.fr>
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*/
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#include "net/routing/rpl-lite/rpl.h"
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#include "net/routing/routing.h"
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/* Log configuration */
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#include "sys/log.h"
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#define LOG_MODULE "RPL"
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#define LOG_LEVEL LOG_LEVEL_RPL
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uip_ipaddr_t rpl_multicast_addr;
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static uint8_t rpl_leaf_only = RPL_DEFAULT_LEAF_ONLY;
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/*---------------------------------------------------------------------------*/
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int
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rpl_lollipop_greater_than(int a, int b)
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{
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/* Check if we are comparing an initial value with an old value */
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if(a > RPL_LOLLIPOP_CIRCULAR_REGION && b <= RPL_LOLLIPOP_CIRCULAR_REGION) {
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return (RPL_LOLLIPOP_MAX_VALUE + 1 + b - a) > RPL_LOLLIPOP_SEQUENCE_WINDOWS;
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}
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/* Otherwise check if a > b and comparable => ok, or
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if they have wrapped and are still comparable */
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return (a > b && (a - b) < RPL_LOLLIPOP_SEQUENCE_WINDOWS) ||
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(a < b && (b - a) > (RPL_LOLLIPOP_CIRCULAR_REGION + 1-
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RPL_LOLLIPOP_SEQUENCE_WINDOWS));
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}
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/*---------------------------------------------------------------------------*/
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const uip_ipaddr_t *
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rpl_get_global_address(void)
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{
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int i;
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uint8_t state;
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uip_ipaddr_t *ipaddr = NULL;
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uip_ipaddr_t *prefix = NULL;
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uint8_t prefix_length = 0;
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if(curr_instance.used && curr_instance.dag.prefix_info.length != 0) {
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prefix = &curr_instance.dag.prefix_info.prefix;
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prefix_length = curr_instance.dag.prefix_info.length;
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}
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for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
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state = uip_ds6_if.addr_list[i].state;
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if(uip_ds6_if.addr_list[i].isused &&
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state == ADDR_PREFERRED &&
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!uip_is_addr_linklocal(&uip_ds6_if.addr_list[i].ipaddr) &&
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(prefix == NULL || uip_ipaddr_prefixcmp(prefix, &uip_ds6_if.addr_list[i].ipaddr, prefix_length))) {
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ipaddr = &uip_ds6_if.addr_list[i].ipaddr;
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}
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}
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return ipaddr;
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_link_callback(const linkaddr_t *addr, int status, int numtx)
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{
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if(curr_instance.used == 1 ) {
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rpl_nbr_t *nbr = rpl_neighbor_get_from_lladdr((uip_lladdr_t *)addr);
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if(nbr != NULL) {
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/* If this is the neighbor we were probing urgently, mark urgent
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probing as done */
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if(curr_instance.dag.urgent_probing_target == nbr) {
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curr_instance.dag.urgent_probing_target = NULL;
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}
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/* Link stats were updated, and we need to update our internal state.
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Updating from here is unsafe; postpone */
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LOG_INFO("packet sent to ");
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LOG_INFO_LLADDR(addr);
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LOG_INFO_(", status %u, tx %u, new link metric %u\n", status, numtx, rpl_neighbor_get_link_metric(nbr));
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rpl_timers_schedule_state_update();
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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rpl_has_joined(void)
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{
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return curr_instance.used && curr_instance.dag.state >= DAG_JOINED;
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}
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/*---------------------------------------------------------------------------*/
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int
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rpl_is_reachable(void)
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{
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return curr_instance.used && curr_instance.dag.state == DAG_REACHABLE;
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_ip_from_prefix(uip_ipaddr_t *ipaddr, rpl_prefix_t *prefix)
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{
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memset(ipaddr, 0, sizeof(uip_ipaddr_t));
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memcpy(ipaddr, &prefix->prefix, (prefix->length + 7) / 8);
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uip_ds6_set_addr_iid(ipaddr, &uip_lladdr);
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_reset_prefix(rpl_prefix_t *last_prefix)
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{
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uip_ipaddr_t ipaddr;
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uip_ds6_addr_t *rep;
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set_ip_from_prefix(&ipaddr, last_prefix);
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rep = uip_ds6_addr_lookup(&ipaddr);
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if(rep != NULL) {
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LOG_INFO("removing global IP address ");
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LOG_INFO_6ADDR(&ipaddr);
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LOG_INFO_("\n");
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uip_ds6_addr_rm(rep);
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}
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curr_instance.dag.prefix_info.length = 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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rpl_set_prefix_from_addr(uip_ipaddr_t *addr, unsigned len, uint8_t flags)
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{
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uip_ipaddr_t ipaddr;
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if(addr == NULL || len == 0 || len > 128 || !(flags & UIP_ND6_RA_FLAG_AUTONOMOUS)) {
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LOG_WARN("prefix not included, not-supported or invalid\n");
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return 0;
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}
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/* Try and initialize prefix */
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memset(&curr_instance.dag.prefix_info.prefix, 0, sizeof(rpl_prefix_t));
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memcpy(&curr_instance.dag.prefix_info.prefix, addr, (len + 7) / 8);
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curr_instance.dag.prefix_info.length = len;
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curr_instance.dag.prefix_info.lifetime = RPL_ROUTE_INFINITE_LIFETIME;
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curr_instance.dag.prefix_info.flags = flags;
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/* Add global address if not already there */
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set_ip_from_prefix(&ipaddr, &curr_instance.dag.prefix_info);
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if(uip_ds6_addr_lookup(&ipaddr) == NULL) {
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LOG_INFO("adding global IP address ");
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LOG_INFO_6ADDR(&ipaddr);
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LOG_INFO_("\n");
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uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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int
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rpl_set_prefix(rpl_prefix_t *prefix)
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{
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if(prefix != NULL && rpl_set_prefix_from_addr(&prefix->prefix, prefix->length, prefix->flags)) {
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curr_instance.dag.prefix_info.lifetime = prefix->lifetime;
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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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static void
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init(void)
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{
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LOG_INFO("initializing\n");
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/* Initialize multicast address and register it */
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uip_create_linklocal_rplnodes_mcast(&rpl_multicast_addr);
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uip_ds6_maddr_add(&rpl_multicast_addr);
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rpl_dag_init();
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rpl_neighbor_init();
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rpl_timers_init();
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rpl_icmp6_init();
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uip_sr_init();
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}
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/*---------------------------------------------------------------------------*/
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static int
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get_sr_node_ipaddr(uip_ipaddr_t *addr, const uip_sr_node_t *node)
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{
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if(addr != NULL && node != NULL) {
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memcpy(addr, &curr_instance.dag.dag_id, 8);
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memcpy(((unsigned char *)addr) + 8, &node->link_identifier, 8);
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return 1;
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} else {
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return 0;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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neighbor_state_changed(uip_ds6_nbr_t *nbr)
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{
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/* Nothing needs be done in non-storing mode */
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}
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/*---------------------------------------------------------------------------*/
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static void
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drop_route(uip_ds6_route_t *route)
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{
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/* Do nothing. RPL-lite only supports non-storing mode, i.e. no routes */
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}
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/*---------------------------------------------------------------------------*/
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void
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rpl_set_leaf_only(uint8_t value)
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{
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rpl_leaf_only = value;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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rpl_get_leaf_only(void)
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{
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return rpl_leaf_only;
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}
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/*---------------------------------------------------------------------------*/
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const struct routing_driver rpl_lite_driver = {
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"RPL Lite",
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init,
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rpl_dag_root_set_prefix,
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rpl_dag_root_start,
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rpl_dag_root_is_root,
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rpl_dag_get_root_ipaddr,
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get_sr_node_ipaddr,
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rpl_dag_poison_and_leave,
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rpl_has_joined,
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rpl_is_reachable,
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rpl_global_repair,
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rpl_local_repair,
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rpl_ext_header_remove,
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rpl_ext_header_update,
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rpl_ext_header_hbh_update,
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rpl_ext_header_srh_update,
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rpl_ext_header_srh_get_next_hop,
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rpl_link_callback,
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neighbor_state_changed,
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drop_route,
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};
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/*---------------------------------------------------------------------------*/
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/** @}*/
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