nes-proj/os/net/routing/rpl-lite/rpl.c

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/*
* Copyright (c) 2009, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
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* \addtogroup rpl-lite
* @{
*
* \file
* ContikiRPL, an implementation of RPL: IPv6 Routing Protocol
* for Low-Power and Lossy Networks (IETF RFC 6550)
*
* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
* Simon Duquennoy <simon.duquennoy@inria.fr>
*/
#include "net/routing/rpl-lite/rpl.h"
#include "net/routing/routing.h"
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/* Log configuration */
#include "sys/log.h"
#define LOG_MODULE "RPL"
#define LOG_LEVEL LOG_LEVEL_RPL
uip_ipaddr_t rpl_multicast_addr;
/*---------------------------------------------------------------------------*/
int
rpl_lollipop_greater_than(int a, int b)
{
/* Check if we are comparing an initial value with an old value */
if(a > RPL_LOLLIPOP_CIRCULAR_REGION && b <= RPL_LOLLIPOP_CIRCULAR_REGION) {
return (RPL_LOLLIPOP_MAX_VALUE + 1 + b - a) > RPL_LOLLIPOP_SEQUENCE_WINDOWS;
}
/* Otherwise check if a > b and comparable => ok, or
if they have wrapped and are still comparable */
return (a > b && (a - b) < RPL_LOLLIPOP_SEQUENCE_WINDOWS) ||
(a < b && (b - a) > (RPL_LOLLIPOP_CIRCULAR_REGION + 1-
RPL_LOLLIPOP_SEQUENCE_WINDOWS));
}
/*---------------------------------------------------------------------------*/
const uip_ipaddr_t *
rpl_get_global_address(void)
{
int i;
uint8_t state;
uip_ipaddr_t *ipaddr = NULL;
uip_ipaddr_t *prefix = NULL;
uint8_t prefix_length = 0;
if(curr_instance.used && curr_instance.dag.prefix_info.length != 0) {
prefix = &curr_instance.dag.prefix_info.prefix;
prefix_length = curr_instance.dag.prefix_info.length;
}
for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
state = uip_ds6_if.addr_list[i].state;
if(uip_ds6_if.addr_list[i].isused &&
state == ADDR_PREFERRED &&
!uip_is_addr_linklocal(&uip_ds6_if.addr_list[i].ipaddr) &&
(prefix == NULL || uip_ipaddr_prefixcmp(prefix, &uip_ds6_if.addr_list[i].ipaddr, prefix_length))) {
ipaddr = &uip_ds6_if.addr_list[i].ipaddr;
}
}
return ipaddr;
}
/*---------------------------------------------------------------------------*/
void
rpl_link_callback(const linkaddr_t *addr, int status, int numtx)
{
if(curr_instance.used == 1 ) {
rpl_nbr_t *nbr = rpl_neighbor_get_from_lladdr((uip_lladdr_t *)addr);
if(nbr != NULL) {
/* Link stats were updated, and we need to update our internal state.
Updating from here is unsafe; postpone */
LOG_INFO("packet sent to ");
LOG_INFO_LLADDR(addr);
LOG_INFO_(", status %u, tx %u, new link metric %u\n", status, numtx, rpl_neighbor_get_link_metric(nbr));
rpl_timers_schedule_state_update();
}
}
}
/*---------------------------------------------------------------------------*/
int
rpl_is_reachable(void)
{
return curr_instance.used && curr_instance.dag.state == DAG_REACHABLE;
}
/*---------------------------------------------------------------------------*/
static void
set_ip_from_prefix(uip_ipaddr_t *ipaddr, rpl_prefix_t *prefix)
{
memset(ipaddr, 0, sizeof(uip_ipaddr_t));
memcpy(ipaddr, &prefix->prefix, (prefix->length + 7) / 8);
uip_ds6_set_addr_iid(ipaddr, &uip_lladdr);
}
/*---------------------------------------------------------------------------*/
void
rpl_reset_prefix(rpl_prefix_t *last_prefix)
{
uip_ipaddr_t ipaddr;
uip_ds6_addr_t *rep;
set_ip_from_prefix(&ipaddr, last_prefix);
rep = uip_ds6_addr_lookup(&ipaddr);
if(rep != NULL) {
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LOG_INFO("removing global IP address ");
LOG_INFO_6ADDR(&ipaddr);
LOG_INFO_("\n");
uip_ds6_addr_rm(rep);
}
curr_instance.dag.prefix_info.length = 0;
}
/*---------------------------------------------------------------------------*/
int
rpl_set_prefix_from_addr(uip_ipaddr_t *addr, unsigned len, uint8_t flags)
{
uip_ipaddr_t ipaddr;
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");
return 0;
}
/* Try and initialize prefix */
memset(&curr_instance.dag.prefix_info.prefix, 0, sizeof(rpl_prefix_t));
memcpy(&curr_instance.dag.prefix_info.prefix, addr, (len + 7) / 8);
curr_instance.dag.prefix_info.length = len;
curr_instance.dag.prefix_info.lifetime = RPL_ROUTE_INFINITE_LIFETIME;
curr_instance.dag.prefix_info.flags = flags;
/* Add global address if not already there */
set_ip_from_prefix(&ipaddr, &curr_instance.dag.prefix_info);
if(uip_ds6_addr_lookup(&ipaddr) == NULL) {
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LOG_INFO("adding global IP address ");
LOG_INFO_6ADDR(&ipaddr);
LOG_INFO_("\n");
uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF);
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
rpl_set_prefix(rpl_prefix_t *prefix)
{
if(prefix != NULL && rpl_set_prefix_from_addr(&prefix->prefix, prefix->length, prefix->flags)) {
curr_instance.dag.prefix_info.lifetime = prefix->lifetime;
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
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LOG_INFO("initializing\n");
/* Initialize multicast address and register it */
uip_create_linklocal_rplnodes_mcast(&rpl_multicast_addr);
uip_ds6_maddr_add(&rpl_multicast_addr);
rpl_dag_init();
rpl_neighbor_init();
rpl_timers_init();
rpl_icmp6_init();
rpl_ns_init();
}
/*---------------------------------------------------------------------------*/
const struct routing_driver rpl_lite_driver = {
"RPL Lite",
init,
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rpl_dag_root_set_prefix,
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rpl_dag_root_start,
};
/*---------------------------------------------------------------------------*/
/** @}*/