Added basic functionality for DAO ACKs and DTSN. Randomized DAO timer.
This commit is contained in:
nvt-se
parent
f4508cc1e2
commit
3748f782c5
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@ -32,7 +32,7 @@
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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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* $Id: rpl-dag.c,v 1.18 2010/06/03 18:37:47 joxe Exp $
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* $Id: rpl-dag.c,v 1.19 2010/06/06 21:42:50 nvt-se Exp $
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*/
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/**
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* \file
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@ -110,8 +110,6 @@ remove_parents(rpl_dag_t *dag, rpl_parent_t *exception, int poison_routes)
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for(p = list_head(dag->parents); p != NULL;) {
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if(p != exception) {
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ANNOTATE("#L %u 0\n", p->addr.u8[sizeof(p->addr) - 1]);
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if(poison_routes == POISON_ROUTES) {
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/* Send no-DAOs to old parents. */
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dao_output(p, ZERO_LIFETIME);
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@ -126,6 +124,13 @@ remove_parents(rpl_dag_t *dag, rpl_parent_t *exception, int poison_routes)
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}
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}
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/************************************************************************/
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static int
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should_send_dao(rpl_dag_t *dag, rpl_dio_t *dio, rpl_parent_t *p)
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{
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return dio->dst_adv_supported && dio->dst_adv_trigger &&
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dio->dtsn > p->dtsn && p == dag->best_parent;
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}
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/************************************************************************/
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rpl_dag_t *
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rpl_set_root(uip_ipaddr_t *dag_id)
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{
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@ -152,6 +157,7 @@ rpl_set_root(uip_ipaddr_t *dag_id)
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dag->rank = ROOT_RANK;
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dag->of = rpl_find_of(RPL_DEFAULT_OCP);
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dag->best_parent = NULL;
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dag->dtsn = 1; /* Trigger DAOs from the beginning. */
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memcpy(&dag->dag_id, dag_id, sizeof(dag->dag_id));
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@ -260,15 +266,15 @@ rpl_add_parent(rpl_dag_t *dag, rpl_dio_t *dio, uip_ipaddr_t *addr)
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}
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memcpy(&p->addr, addr, sizeof(p->addr));
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p->local_confidence = 0;
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p->dag = dag;
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p->rank = dio->dag_rank;
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p->local_confidence = 0;
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p->dtsn = 0;
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list_add(dag->parents, p);
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/* Draw a line between the node and its parent in Cooja. */
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ANNOTATE("#L %u 1\n",
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addr->u8[sizeof(*addr) - 1]);
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ANNOTATE("#L %u 1\n", addr->u8[sizeof(*addr) - 1]);
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return p;
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}
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@ -422,6 +428,8 @@ join_dag(uip_ipaddr_t *from, rpl_dio_t *dio)
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dag->rank = dag->of->increment_rank(dio->dag_rank, p);
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dag->min_rank = dag->rank; /* So far this is the lowest rank we know */
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dag->version = dio->version;
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dag->best_parent = p;
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dag->dio_intdoubl = dio->dag_intdoubl;
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dag->dio_intmin = dio->dag_intmin;
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dag->dio_redundancy = dio->dag_redund;
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@ -442,7 +450,7 @@ join_dag(uip_ipaddr_t *from, rpl_dio_t *dio)
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rpl_reset_dio_timer(dag, 1);
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rpl_set_default_route(dag, from);
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if(dio->dst_adv_supported && dio->dst_adv_trigger) {
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if(should_send_dao(dag, dio, p)) {
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rpl_schedule_dao(dag);
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} else {
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PRINTF("RPL: dst_adv_trigger not set in incoming DIO!\n");
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@ -456,6 +464,7 @@ global_repair(uip_ipaddr_t *from, rpl_dag_t *dag, rpl_dio_t *dio)
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remove_parents(dag, NULL, !POISON_ROUTES);
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dag->version = dio->version;
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dag->dtsn = 0;
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dag->of->reset(dag);
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if((p = rpl_add_parent(dag, dio, from)) == NULL) {
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PRINTF("RPL: Failed to add a parent during the global repair\n");
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@ -464,6 +473,9 @@ global_repair(uip_ipaddr_t *from, rpl_dag_t *dag, rpl_dio_t *dio)
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rpl_set_default_route(dag, from);
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dag->rank = dag->of->increment_rank(dio->dag_rank, p);
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rpl_reset_dio_timer(dag, 1);
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if(should_send_dao(dag, dio, p)) {
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rpl_schedule_dao(dag);
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}
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}
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PRINTF("RPL: Participating in a global repair (version=%u, rank=%hu)\n",
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dag->version, dag->rank);
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@ -475,6 +487,7 @@ rpl_repair_dag(rpl_dag_t *dag)
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{
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if(dag->rank == ROOT_RANK) {
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dag->version++;
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dag->dtsn = 1;
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rpl_reset_dio_timer(dag, 1);
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return 1;
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}
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@ -531,13 +544,15 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
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return;
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}
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dag->dtsn = dio->dtsn;
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/* This DIO pertains to a DAG that we are already part of. */
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p = rpl_find_parent(dag, from);
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if(p != NULL) {
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if(dio->dst_adv_supported && dio->dst_adv_trigger &&
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p == rpl_preferred_parent(dag)) {
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if(should_send_dao(dag, dio, p)) {
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rpl_schedule_dao(dag);
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}
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p->dtsn = dio->dtsn;
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if(p->rank > dio->dag_rank) {
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p->rank = dio->dag_rank;
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@ -33,7 +33,7 @@
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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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* $Id: rpl-icmp6.c,v 1.17 2010/06/06 12:45:55 joxe Exp $
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* $Id: rpl-icmp6.c,v 1.18 2010/06/06 21:42:50 nvt-se Exp $
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*/
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/**
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* \file
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@ -59,6 +59,7 @@
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#include "net/uip-debug.h"
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/*---------------------------------------------------------------------------*/
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#define RPL_DIO_GROUNDED 0x80
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#define RPL_DIO_DEST_ADV_SUPPORTED 0x40
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#define RPL_DIO_DEST_ADV_TRIGGER 0x20
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@ -71,11 +72,14 @@
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_ICMP_BUF ((struct uip_icmp_hdr *)&uip_buf[uip_l2_l3_hdr_len])
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#define UIP_ICMP_PAYLOAD ((unsigned char *)&uip_buf[uip_l2_l3_icmp_hdr_len])
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/*---------------------------------------------------------------------------*/
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static void dis_input(void);
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static void dio_input(void);
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static void dao_input(void);
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static void dao_ack_input(void);
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static uint8_t dao_sequence;
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/*---------------------------------------------------------------------------*/
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static int
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get_global_addr(uip_ipaddr_t *addr)
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{
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@ -94,7 +98,6 @@ get_global_addr(uip_ipaddr_t *addr)
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static uint32_t
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get32(uint8_t *buffer, int pos)
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@ -333,8 +336,6 @@ dio_output(rpl_dag_t *dag, uip_ipaddr_t *uc_addr)
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buffer[pos++] = dag->of->ocp >> 8;
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buffer[pos++] = dag->of->ocp & 0xff;
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/* alignment here ??? */
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/* always add a sub-option for DAG configuration */
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buffer[pos++] = RPL_DIO_SUBOPT_DAG_CONF;
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buffer[pos++] = 8;
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@ -389,6 +390,7 @@ dio_output(rpl_dag_t *dag, uip_ipaddr_t *uc_addr)
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static void
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dao_input(void)
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{
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uip_ipaddr_t dao_sender_addr;
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rpl_dag_t *dag;
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unsigned char *buffer;
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uint16_t sequence;
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@ -404,14 +406,16 @@ dao_input(void)
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int pos;
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int len;
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int i;
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int learned_from;
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lifetime = 0;
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prefixlen = 0;
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uip_ipaddr_copy(&dao_sender_addr, &UIP_IP_BUF->srcipaddr);
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/* Destination Advertisement Object */
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PRINTF("RPL: Received a DAO from ");
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINT6ADDR(&dao_sender_addr);
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PRINTF("\n");
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buffer = UIP_ICMP_PAYLOAD;
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@ -482,24 +486,26 @@ dao_input(void)
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return;
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}
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rep = rpl_add_route(dag, &prefix, prefixlen,
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&UIP_IP_BUF->srcipaddr);
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learned_from = uip_is_addr_mcast(&dao_sender_addr) ?
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RPL_ROUTE_FROM_MULTICAST_DAO : RPL_ROUTE_FROM_UNICAST_DAO;
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rep = rpl_add_route(dag, &prefix, prefixlen, &dao_sender_addr);
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if(rep == NULL) {
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PRINTF("RPL: Could not add a route while receiving a DAO\n");
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PRINTF("RPL: Could not add a route after receiving a DAO\n");
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return;
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} else {
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rep->state.lifetime = lifetime;
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rep->state.learned_from = learned_from;
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}
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rep->state.lifetime = lifetime;
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if(uip_is_addr_mcast(&UIP_IP_BUF->destipaddr)) {
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rep->state.learned_from = RPL_ROUTE_FROM_MULTICAST_DAO;
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} else {
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rep->state.learned_from = RPL_ROUTE_FROM_UNICAST_DAO;
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if(learned_from == RPL_ROUTE_FROM_UNICAST_DAO) {
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if((n = rpl_preferred_parent(dag)) != NULL) {
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PRINTF("RPL: Forwarding DAO to parent ");
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PRINT6ADDR(&n->addr);
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PRINTF("\n");
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uip_icmp6_send(&n->addr, ICMP6_RPL, RPL_CODE_DAO, buffer_length);
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} else if(flags & RPL_DAO_K_FLAG) {
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dao_ack_output(dag, &dao_sender_addr, sequence);
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}
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}
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}
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@ -509,7 +515,6 @@ dao_output(rpl_parent_t *n, uint32_t lifetime)
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{
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rpl_dag_t *dag;
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unsigned char *buffer;
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static uint16_t sequence;
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uint8_t prefixlen;
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uip_ipaddr_t addr;
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uip_ipaddr_t prefix;
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@ -533,13 +538,13 @@ dao_output(rpl_parent_t *n, uint32_t lifetime)
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buffer = UIP_ICMP_PAYLOAD;
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++sequence;
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++dao_sequence;
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pos = 0;
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buffer[pos++] = dag->instance_id;
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buffer[pos++] = 0; /* no ack request, no DODAGID */
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buffer[pos++] = RPL_DAO_K_FLAG; /* no ack request, no DODAGID */
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buffer[pos++] = 0; /* reserved */
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buffer[pos++] = sequence & 0xff;
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buffer[pos++] = dao_sequence & 0xff;
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/* create target subopt */
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prefixlen = sizeof(prefix) * CHAR_BIT;
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@ -577,6 +582,47 @@ dao_output(rpl_parent_t *n, uint32_t lifetime)
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uip_icmp6_send(&addr, ICMP6_RPL, RPL_CODE_DAO, pos);
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}
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/*---------------------------------------------------------------------------*/
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static void
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dao_ack_input(void)
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{
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unsigned char *buffer;
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uint8_t buffer_length;
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uint8_t instance_id;
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uint8_t sequence;
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uint8_t status;
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buffer = UIP_ICMP_PAYLOAD;
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buffer_length = uip_len - uip_l2_l3_icmp_hdr_len;
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instance_id = buffer[0];
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sequence = buffer[2];
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status = buffer[3];
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PRINTF("RPL: Received a DAO ACK with sequence number %d and status %d from ",
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sequence, status);
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PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
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PRINTF("\n");
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}
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/*---------------------------------------------------------------------------*/
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void
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dao_ack_output(rpl_dag_t *dag, uip_ipaddr_t *dest, uint8_t sequence)
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{
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unsigned char *buffer;
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PRINTF("RPL: Sending a DAO ACK with sequence number %d to ", sequence);
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PRINT6ADDR(dest);
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PRINTF("\n");
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buffer = UIP_ICMP_PAYLOAD;
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buffer[0] = dag->instance_id;
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buffer[1] = 0;
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buffer[2] = sequence;
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buffer[3] = 0;
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uip_icmp6_send(dest, ICMP6_RPL, RPL_CODE_DAO_ACK, 4);
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}
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/*---------------------------------------------------------------------------*/
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void
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uip_rpl_input(void)
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{
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@ -591,6 +637,9 @@ uip_rpl_input(void)
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case RPL_CODE_DAO:
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dao_input();
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break;
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case RPL_CODE_DAO_ACK:
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dao_ack_input();
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break;
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default:
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PRINTF("RPL: received an unknown ICMP6 code (%u)\n", UIP_ICMP_BUF->icode);
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break;
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@ -30,7 +30,7 @@
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*
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* Author: Joakim Eriksson, Nicolas Tsiftes
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*
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* $Id: rpl.h,v 1.12 2010/06/03 15:20:56 nvt-se Exp $
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* $Id: rpl.h,v 1.13 2010/06/06 21:42:50 nvt-se Exp $
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*/
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#ifndef RPL_H
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@ -90,7 +90,7 @@
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/*---------------------------------------------------------------------------*/
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/* Default values for RPL constants and variables. */
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#define DEFAULT_DAO_LATENCY (CLOCK_SECOND * 10)
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#define DEFAULT_DAO_LATENCY (CLOCK_SECOND * (1 + (random_rand() + 0xf)))
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/* Special value indicating immediate removal. */
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#define ZERO_LIFETIME 0
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@ -162,6 +162,7 @@ struct rpl_parent {
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uip_ipaddr_t addr;
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rpl_rank_t rank;
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uint8_t local_confidence;
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uint8_t dtsn;
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};
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typedef struct rpl_parent rpl_parent_t;
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@ -265,6 +266,7 @@ typedef struct rpl_dag rpl_dag_t;
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void dis_output(uip_ipaddr_t *addr);
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void dio_output(rpl_dag_t *, uip_ipaddr_t *uc_addr);
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void dao_output(rpl_parent_t *, uint32_t lifetime);
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void dao_ack_output(rpl_dag_t *, uip_ipaddr_t *, uint8_t);
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void uip_rpl_input(void);
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/* RPL logic functions. */
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