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osd-contiki/core/net/rpl/rpl.c
Vincent Brillault dc9cbe647d Changes in RPL implementation : 
- Structural modification of RPL data storage.
- Support multiple gateways (multiple DODAG-ID with a unique InstanceID)
- Use Lollipop counters
- Add leaf-only configuration option for RPL
Bugfix :
- Correctly send "Grounded" flag in DIO
2011-07-11 16:52:45 +02:00

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/**
* \addtogroup uip6
* @{
*/
/*
* 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.
*/
/**
* \file
* ContikiRPL, an implementation of IETF ROLL RPL.
*
* \author Joakim Eriksson <joakime@sics.se>, Nicolas Tsiftes <nvt@sics.se>
*/
#include "net/uip.h"
#include "net/tcpip.h"
#include "net/uip-ds6.h"
#include "net/rpl/rpl-private.h"
#include "net/neighbor-info.h"
#define DEBUG DEBUG_NONE
#include "net/uip-debug.h"
#include <limits.h>
#include <string.h>
#if RPL_CONF_STATS
rpl_stats_t rpl_stats;
#endif
/************************************************************************/
extern uip_ds6_route_t uip_ds6_routing_table[UIP_DS6_ROUTE_NB];
#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
#define UIP_EXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define UIP_HBHO_BUF ((struct uip_hbho_hdr *)&uip_buf[uip_l2_l3_hdr_len])
#define UIP_HBHO_NEXT_BUF ((struct uip_ext_hdr *)&uip_buf[uip_l2_l3_hdr_len + RPL_OP_BY_OP_LEN])
#define UIP_EXT_HDR_OPT_BUF ((struct uip_ext_hdr_opt *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
#define UIP_EXT_HDR_OPT_PADN_BUF ((struct uip_ext_hdr_opt_padn *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
#define UIP_EXT_HDR_OPT_RPL_BUF ((struct uip_ext_hdr_opt_rpl *)&uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])
/************************************************************************/
void
rpl_purge_routes(void)
{
int i;
for(i = 0; i < UIP_DS6_ROUTE_NB; i++) {
if(uip_ds6_routing_table[i].isused) {
if(uip_ds6_routing_table[i].state.lifetime <= 1) {
uip_ds6_route_rm(&uip_ds6_routing_table[i]);
} else {
uip_ds6_routing_table[i].state.lifetime--;
}
}
}
}
/************************************************************************/
void
rpl_remove_routes(rpl_dag_t *dag)
{
int i;
for(i = 0; i < UIP_DS6_ROUTE_NB; i++) {
if(uip_ds6_routing_table[i].state.dag == dag) {
uip_ds6_route_rm(&uip_ds6_routing_table[i]);
}
}
}
/************************************************************************/
void
rpl_remove_routes_by_nexthop(uip_ipaddr_t *nexthop, rpl_dag_t *dag)
{
uip_ds6_route_t *locroute;
for(locroute = uip_ds6_routing_table;
locroute < uip_ds6_routing_table + UIP_DS6_ROUTE_NB;
locroute++) {
if(locroute->isused
&& uip_ipaddr_cmp(&locroute->nexthop, nexthop)
&& locroute->state.dag == dag) {
locroute->isused = 0;
}
}
ANNOTATE("#L %u 0\n",nexthop->u8[sizeof(uip_ipaddr_t) - 1]);
}
/************************************************************************/
uip_ds6_route_t *
rpl_add_route(rpl_dag_t *dag, uip_ipaddr_t *prefix, int prefix_len,
uip_ipaddr_t *next_hop)
{
uip_ds6_route_t *rep;
rep = uip_ds6_route_lookup(prefix);
if(rep == NULL) {
if((rep = uip_ds6_route_add(prefix, prefix_len, next_hop, 0)) == NULL) {
PRINTF("RPL: No space for more route entries\n");
return NULL;
}
} else {
PRINTF("RPL: Updated the next hop for prefix ");
PRINT6ADDR(prefix);
PRINTF(" to ");
PRINT6ADDR(next_hop);
PRINTF("\n");
uip_ipaddr_copy(&rep->nexthop, next_hop);
}
rep->state.dag = dag;
rep->state.lifetime = RPL_LIFETIME(dag->instance, dag->instance->default_lifetime);
rep->state.learned_from = RPL_ROUTE_FROM_INTERNAL;
PRINTF("RPL: Added a route to ");
PRINT6ADDR(prefix);
PRINTF("/%d via ", prefix_len);
PRINT6ADDR(next_hop);
PRINTF("\n");
return rep;
}
/************************************************************************/
static void
rpl_link_neighbor_callback(const rimeaddr_t *addr, int known, int etx)
{
uip_ipaddr_t ipaddr;
rpl_parent_t *parent;
rpl_instance_t *instance;
rpl_instance_t *end;
uip_ip6addr(&ipaddr, 0xfe80, 0, 0, 0, 0, 0, 0, 0);
uip_ds6_set_addr_iid(&ipaddr, (uip_lladdr_t *)addr);
PRINTF("RPL: Neighbor ");
PRINT6ADDR(&ipaddr);
PRINTF(" is %sknown. ETX = %u\n", known ? "" : "no longer ", NEIGHBOR_INFO_FIX2ETX(etx));
for( instance = &instance_table[0], end = instance + RPL_MAX_INSTANCES; instance < end; ++instance) {
if ( instance->used == 1 ) {
parent = rpl_find_parent_any_dag(instance, &ipaddr);
if(!(parent == NULL)) {
/* Trigger DAG rank recalculation. */
parent->updated = 1;
parent->link_metric = etx;
if(instance->of->parent_state_callback != NULL) {
instance->of->parent_state_callback(parent, known, etx);
}
if(!known) {
PRINTF("RPL: Removing parent ");
PRINT6ADDR(&parent->addr);
PRINTF(" in instance %u because of bad connectivity (ETX %d)\n", instance->instance_id, etx);
parent->rank = INFINITE_RANK;
}
}
}
}
if (!known) {
PRINTF("RPL: Deleting routes installed by DAOs received from ");
PRINT6ADDR(&ipaddr);
PRINTF("\n");
uip_ds6_route_rm_by_nexthop(&ipaddr);
}
}
/************************************************************************/
void
rpl_ipv6_neighbor_callback(uip_ds6_nbr_t *nbr)
{
rpl_parent_t *p;
rpl_instance_t *instance;
rpl_instance_t *end;
if(!nbr->isused) {
PRINTF("RPL: Removing neighbor ");
PRINT6ADDR(&nbr->ipaddr);
PRINTF("\n");
for( instance = &instance_table[0], end = instance + RPL_MAX_INSTANCES; instance < end; ++instance) {
if ( instance->used == 1 ) {
p = rpl_find_parent_any_dag(instance, &nbr->ipaddr);
if(p != NULL) {
p->rank = INFINITE_RANK;
/* Trigger DAG rank recalculation. */
p->updated = 1;
}
}
}
}
}
/************************************************************************/
void
rpl_init(void)
{
uip_ipaddr_t rplmaddr;
PRINTF("RPL started\n");
default_instance=NULL;
rpl_reset_periodic_timer();
neighbor_info_subscribe(rpl_link_neighbor_callback);
/* add rpl multicast address */
uip_create_linklocal_rplnodes_mcast(&rplmaddr);
uip_ds6_maddr_add(&rplmaddr);
#if RPL_CONF_STATS
memset(&rpl_stats, 0, sizeof(rpl_stats));
#endif
}
/************************************************************************/
int
rpl_verify_header(int uip_ext_opt_offset)
{
rpl_instance_t *instance;
if (UIP_EXT_HDR_OPT_RPL_BUF->opt_len != RPL_HDR_OPT_LEN) {
PRINTF("RPL: Bad header option (wrong length) !\n");
return 1;
}
if (UIP_EXT_HDR_OPT_RPL_BUF->flags&RPL_HDR_OPT_FWD_ERR) {
PRINTF("RPL: Forward error !\n");
/* We should try to repair it, not implemented for the moment */
return 2;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if (instance == NULL) {
PRINTF("RPL : Unknown instance : %u\n",UIP_EXT_HDR_OPT_RPL_BUF->instance);
return 1;
}
if (!instance->current_dag->joined) {
PRINTF("RPL : No dag in the instance\n");
return 1;
}
if (UIP_EXT_HDR_OPT_RPL_BUF->flags&RPL_HDR_OPT_DOWN) {
PRINTF("RPL: Packet going down :\n");
if (UIP_EXT_HDR_OPT_RPL_BUF->senderrank>instance->current_dag->rank) {
PRINTF("RPL: Loop detected : Sender rank > our rank\n");
if (UIP_EXT_HDR_OPT_RPL_BUF->flags&RPL_HDR_OPT_RANK_ERR) {
PRINTF("RPL: Loop detected !\n");
/* We should try to repair it, not implemented for the moment */
return 3;
}
PRINTF("RPL: Single error tolerated\n");
UIP_EXT_HDR_OPT_RPL_BUF->flags|=RPL_HDR_OPT_RANK_ERR;
return 0;
}
} else {
PRINTF("RPL: Packet going up :");
if (UIP_EXT_HDR_OPT_RPL_BUF->senderrank<instance->current_dag->rank) {
PRINTF("RPL: Rank error : Sender rank < our rank\n");
if (UIP_EXT_HDR_OPT_RPL_BUF->flags&RPL_HDR_OPT_RANK_ERR) {
PRINTF("RPL: Loop detected !\n");
/* We should try to repair it, not implemented for the moment */
return 3;
}
PRINTF("RPL: Single error tolerated\n");
UIP_EXT_HDR_OPT_RPL_BUF->flags|=RPL_HDR_OPT_RANK_ERR;
return 0;
}
}
PRINTF("RPL: rank Ok\n");
return 0;
}
/************************************************************************/
void
rpl_update_header_empty(void)
{
rpl_instance_t *instance;
int uip_ext_opt_offset;
int last_uip_ext_len;
u8_t temp_len;
last_uip_ext_len=uip_ext_len;
uip_ext_len=0;
uip_ext_opt_offset = 2;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto){
case UIP_PROTO_HBHO:
if (UIP_HBHO_BUF->len != RPL_OP_BY_OP_LEN - 8) {
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
uip_ext_len=last_uip_ext_len;
return;
}
instance = rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance);
if(instance == NULL || (!instance->used) || (!instance->current_dag->joined) ) {
PRINTF("Unable to add RPL hop-by-hop extension header : incorrect instance\n");
return;
}
break;
default:
PRINTF("RPL: No Hop-by-Hop Option found, creating it\n");
if(uip_len + RPL_OP_BY_OP_LEN >UIP_LINK_MTU) {
PRINTF("RPL: Packet too long : impossible to add rpl Hop-by-Hop option\n");
uip_ext_len=last_uip_ext_len;
return;
}
memmove(UIP_HBHO_NEXT_BUF,UIP_EXT_BUF,uip_len-UIP_IPH_LEN);
memset(UIP_HBHO_BUF,0,RPL_OP_BY_OP_LEN);
UIP_HBHO_BUF->next=UIP_IP_BUF->proto;
UIP_IP_BUF->proto=UIP_PROTO_HBHO;
UIP_HBHO_BUF->len=RPL_OP_BY_OP_LEN - 8;
UIP_EXT_HDR_OPT_RPL_BUF->opt_type=UIP_EXT_HDR_OPT_RPL;
UIP_EXT_HDR_OPT_RPL_BUF->opt_len=RPL_HDR_OPT_LEN;
UIP_EXT_HDR_OPT_RPL_BUF->flags=0;
UIP_EXT_HDR_OPT_RPL_BUF->instance=0;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=0;
uip_len+=RPL_OP_BY_OP_LEN;
temp_len=UIP_IP_BUF->len[1];
UIP_IP_BUF->len[1]+=(UIP_HBHO_BUF->len + 8);
if (UIP_IP_BUF->len[1]<temp_len) {
UIP_IP_BUF->len[0]+=1;
}
uip_ext_len=last_uip_ext_len+RPL_OP_BY_OP_LEN;
return;
}
switch (UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=instance->current_dag->rank;
uip_ext_len=last_uip_ext_len;
return;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len=last_uip_ext_len;
return;
}
}
/************************************************************************/
int
rpl_update_header_final(uip_ipaddr_t *addr)
{
int uip_ext_opt_offset;
int last_uip_ext_len;
last_uip_ext_len=uip_ext_len;
uip_ext_len=0;
uip_ext_opt_offset = 2;
rpl_parent_t *parent;
if (UIP_IP_BUF->proto == UIP_PROTO_HBHO){
if (UIP_HBHO_BUF->len != RPL_OP_BY_OP_LEN - 8) {
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
if (UIP_EXT_HDR_OPT_BUF->type == UIP_EXT_HDR_OPT_RPL) {
if (UIP_EXT_HDR_OPT_RPL_BUF->senderrank==0) {
PRINTF("RPL: Updating RPL option\n");
if(default_instance == NULL || (!default_instance->used) || (!default_instance->current_dag->joined) ) {
PRINTF("Unable to add RPL hop-by-hop extension header : incorrect default instance\n");
return 1;
}
parent=rpl_find_parent(default_instance->current_dag,addr);
if (parent == NULL || (parent != parent->dag->preferred_parent)) {
UIP_EXT_HDR_OPT_RPL_BUF->flags=RPL_HDR_OPT_DOWN;
}
UIP_EXT_HDR_OPT_RPL_BUF->instance=default_instance->instance_id;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=default_instance->current_dag->rank;
uip_ext_len=last_uip_ext_len;
}
}
}
return 0;
}
/************************************************************************/
int
rpl_add_header(rpl_instance_t *instance,int down)
{
int uip_ext_opt_offset;
int last_uip_ext_len;
u8_t temp_len;
last_uip_ext_len = uip_ext_len;
uip_ext_len = 0;
uip_ext_opt_offset = 2;
if(instance == NULL || (!instance->used) || (!instance->current_dag->joined) ) {
PRINTF("Unable to add RPL hop-by-hop extension header : incorrect instance\n");
return 0;
}
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto){
case UIP_PROTO_HBHO:
if (UIP_HBHO_BUF->len != RPL_OP_BY_OP_LEN - 8) {
PRINTF("RPL: Non RPL Hop-by-hop options support not implemented\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
break;
default:
PRINTF("RPL: No Hop-by-Hop Option found, creating it\n");
if(uip_len + RPL_OP_BY_OP_LEN >UIP_LINK_MTU) {
PRINTF("RPL: Packet too long : impossible to add rpl Hop-by-Hop option\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
memmove(UIP_HBHO_NEXT_BUF,UIP_EXT_BUF,uip_len-UIP_IPH_LEN);
memset(UIP_HBHO_BUF,0,RPL_OP_BY_OP_LEN);
UIP_HBHO_BUF->next=UIP_IP_BUF->proto;
UIP_IP_BUF->proto=UIP_PROTO_HBHO;
UIP_HBHO_BUF->len=RPL_OP_BY_OP_LEN - 8;
UIP_EXT_HDR_OPT_RPL_BUF->opt_type=UIP_EXT_HDR_OPT_RPL;
UIP_EXT_HDR_OPT_RPL_BUF->opt_len=RPL_HDR_OPT_LEN;
UIP_EXT_HDR_OPT_RPL_BUF->flags=RPL_HDR_OPT_DOWN&(down<<RPL_HDR_OPT_DOWN_SHIFT);
UIP_EXT_HDR_OPT_RPL_BUF->instance=instance->instance_id;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=instance->current_dag->rank;
uip_len+=RPL_OP_BY_OP_LEN;
temp_len=UIP_IP_BUF->len[1];
UIP_IP_BUF->len[1]+=(UIP_HBHO_BUF->len + 8);
if (UIP_IP_BUF->len[1]<temp_len) {
UIP_IP_BUF->len[0]+=1;
}
uip_ext_len=last_uip_ext_len+RPL_OP_BY_OP_LEN;
return 1;
}
switch (UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option\n");
UIP_EXT_HDR_OPT_RPL_BUF->opt_type=UIP_EXT_HDR_OPT_RPL;
UIP_EXT_HDR_OPT_RPL_BUF->opt_len=RPL_HDR_OPT_LEN;
UIP_EXT_HDR_OPT_RPL_BUF->flags=RPL_HDR_OPT_DOWN&(down<<RPL_HDR_OPT_DOWN_SHIFT);
UIP_EXT_HDR_OPT_RPL_BUF->instance=instance->instance_id;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=instance->current_dag->rank;
uip_ext_len=last_uip_ext_len;
return 1;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
}
/************************************************************************/
int
rpl_add_header_root(void)
{
return rpl_add_header(default_instance,1);
}
/************************************************************************/
void
rpl_remove_header()
{
int last_uip_ext_len;
u8_t temp_len;
last_uip_ext_len=uip_ext_len;
uip_ext_len=0;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto){
case UIP_PROTO_HBHO:
PRINTF("RPL: Removing the present RPL header option\n");
UIP_IP_BUF->proto=UIP_HBHO_BUF->next;
temp_len=UIP_IP_BUF->len[1];
uip_len-=UIP_HBHO_BUF->len + 8;
UIP_IP_BUF->len[1]-=(UIP_HBHO_BUF->len + 8);
if (UIP_IP_BUF->len[1]>temp_len) {
UIP_IP_BUF->len[0]-=1;
}
memmove(UIP_EXT_BUF, UIP_HBHO_NEXT_BUF, uip_len - UIP_IPH_LEN);
break;
default:
PRINTF("RPL: No Hop-by-Hop Option found\n");
}
}
/************************************************************************/
u8_t
rpl_invert_header()
{
u8_t uip_ext_opt_offset;
u8_t last_uip_ext_len;
last_uip_ext_len=uip_ext_len;
uip_ext_len=0;
uip_ext_opt_offset = 2;
PRINTF("RPL: Verifying the presence of the RPL header option\n");
switch(UIP_IP_BUF->proto){
case UIP_PROTO_HBHO:
break;
default:
PRINTF("RPL: No Hop-by-Hop Option found\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
switch (UIP_EXT_HDR_OPT_BUF->type) {
case UIP_EXT_HDR_OPT_RPL:
PRINTF("RPL: Updating RPL option (Inverting Up<->Down)\n");
UIP_EXT_HDR_OPT_RPL_BUF->flags&=RPL_HDR_OPT_DOWN;
UIP_EXT_HDR_OPT_RPL_BUF->flags^=RPL_HDR_OPT_DOWN;
UIP_EXT_HDR_OPT_RPL_BUF->senderrank=rpl_get_instance(UIP_EXT_HDR_OPT_RPL_BUF->instance)->current_dag->rank;
uip_ext_len=last_uip_ext_len;
return RPL_OP_BY_OP_LEN;
default:
PRINTF("RPL: Multi Hop-by-hop options not implemented\n");
uip_ext_len=last_uip_ext_len;
return 0;
}
}
/************************************************************************/
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