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Minor rpl-lite fixes for DAG leaving/joining

This commit is contained in:
Simon Duquennoy 2017-07-14 14:29:17 +02:00
parent 38ce63a614
commit c6537820b1
4 changed files with 114 additions and 90 deletions
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2
apps/shell/shell-commands.c
View File

@ -220,7 +220,7 @@ PT_THREAD(cmd_rpl_set_root(struct pt *pt, shell_output_func output, char *args))
} else {
if(rpl_dag_root_is_root()) {
SHELL_OUTPUT(output, "Setting as non-root node: leaving DAG\n");
rpl_dag_leave();
rpl_dag_poison_and_leave();
} else {
SHELL_OUTPUT(output, "Node is not a DAG root\n");
}

180
core/net/rpl-lite/rpl-dag.c
View File

@ -88,8 +88,10 @@ rpl_dag_leave(void)
LOG_INFO_(", instance %u\n", curr_instance.instance_id);
/* Issue a no-path DAO */
RPL_LOLLIPOP_INCREMENT(curr_instance.dag.dao_curr_seqno);
rpl_icmp6_dao_output(0);
if(!rpl_dag_root_is_root()) {
RPL_LOLLIPOP_INCREMENT(curr_instance.dag.dao_curr_seqno);
rpl_icmp6_dao_output(0);
}
/* Forget past link statistics */
link_stats_reset();
@ -111,6 +113,13 @@ rpl_dag_leave(void)
}
/*---------------------------------------------------------------------------*/
void
rpl_dag_poison_and_leave(void)
{
curr_instance.dag.state = DAG_POISONING;
rpl_timers_schedule_state_update();
}
/*---------------------------------------------------------------------------*/
void
rpl_dag_periodic(unsigned seconds)
{
if(curr_instance.used) {
@ -223,97 +232,98 @@ rpl_dag_ready_to_advertise(void)
void
rpl_dag_update_state(void)
{
if(curr_instance.used) {
if(!rpl_dag_root_is_root()) {
rpl_nbr_t *old_parent = curr_instance.dag.preferred_parent;
rpl_rank_t old_rank = curr_instance.dag.rank;
rpl_rank_t old_rank;
/* Any scheduled state update is no longer needed */
rpl_timers_unschedule_state_update();
if(!curr_instance.used) {
return;
}
if(curr_instance.dag.state == DAG_POISONING) {
rpl_neighbor_set_preferred_parent(NULL);
curr_instance.dag.rank = RPL_INFINITE_RANK;
if(old_rank != RPL_INFINITE_RANK) {
/* Advertise that we are leaving, and leave after a delay */
LOG_WARN("poisoning and leaving after a delay\n");
rpl_timers_dio_reset("Poison routes");
rpl_timers_schedule_leaving();
old_rank = curr_instance.dag.rank;
/* Any scheduled state update is no longer needed */
rpl_timers_unschedule_state_update();
if(curr_instance.dag.state == DAG_POISONING) {
rpl_neighbor_set_preferred_parent(NULL);
curr_instance.dag.rank = RPL_INFINITE_RANK;
if(old_rank != RPL_INFINITE_RANK) {
/* Advertise that we are leaving, and leave after a delay */
LOG_WARN("poisoning and leaving after a delay\n");
rpl_timers_dio_reset("Poison routes");
rpl_timers_schedule_leaving();
}
} else if(!rpl_dag_root_is_root()) {
rpl_nbr_t *old_parent = curr_instance.dag.preferred_parent;
rpl_nbr_t *nbr;
/* Select and set preferred parent */
rpl_neighbor_set_preferred_parent(rpl_neighbor_select_best());
/* Update rank */
curr_instance.dag.rank = rpl_neighbor_rank_via_nbr(curr_instance.dag.preferred_parent);
/* Update better_parent_since flag for each neighbor */
nbr = nbr_table_head(rpl_neighbors);
while(nbr != NULL) {
if(rpl_neighbor_rank_via_nbr(nbr) < curr_instance.dag.rank) {
/* This neighbor would be a better parent than our current.
Set 'better_parent_since' if not already set. */
if(nbr->better_parent_since == 0) {
nbr->better_parent_since = clock_time(); /* Initialize */
}
} else {
rpl_nbr_t *nbr;
/* Select and set preferred parent */
rpl_neighbor_set_preferred_parent(rpl_neighbor_select_best());
/* Update rank */
curr_instance.dag.rank = rpl_neighbor_rank_via_nbr(curr_instance.dag.preferred_parent);
/* Update better_parent_since flag for each neighbor */
nbr = nbr_table_head(rpl_neighbors);
while(nbr != NULL) {
if(rpl_neighbor_rank_via_nbr(nbr) < curr_instance.dag.rank) {
/* This neighbor would be a better parent than our current.
Set 'better_parent_since' if not already set. */
if(nbr->better_parent_since == 0) {
nbr->better_parent_since = clock_time(); /* Initialize */
}
} else {
nbr->better_parent_since = 0; /* Not a better parent */
}
nbr = nbr_table_next(rpl_neighbors, nbr);
}
if(old_parent == NULL || curr_instance.dag.rank < curr_instance.dag.lowest_rank) {
/* This is a slight departure from RFC6550: if we had no preferred parent before,
* reset lowest_rank. This helps recovering from temporary bad link conditions. */
curr_instance.dag.lowest_rank = curr_instance.dag.rank;
}
/* Reset DIO timer in case of significant rank update */
if(curr_instance.dag.last_advertised_rank != RPL_INFINITE_RANK
&& curr_instance.dag.rank != RPL_INFINITE_RANK
&& ABS((int32_t)curr_instance.dag.rank - curr_instance.dag.last_advertised_rank) > RPL_SIGNIFICANT_CHANGE_THRESHOLD) {
LOG_WARN("significant rank update %u->%u\n",
curr_instance.dag.last_advertised_rank, curr_instance.dag.rank);
/* Update already here to avoid multiple resets in a row */
curr_instance.dag.last_advertised_rank = curr_instance.dag.rank;
rpl_timers_dio_reset("Significant rank update");
}
/* Parent switch */
if(curr_instance.dag.preferred_parent != old_parent) {
/* We just got a parent (was NULL), reset trickle timer to advertise this */
if(old_parent == NULL) {
curr_instance.dag.state = DAG_JOINED;
rpl_timers_dio_reset("Got parent");
LOG_WARN("found parent: ");
LOG_WARN_6ADDR(rpl_neighbor_get_ipaddr(curr_instance.dag.preferred_parent));
LOG_WARN_(", staying in DAG\n");
rpl_timers_unschedule_leaving();
}
/* Schedule a DAO */
if(curr_instance.dag.preferred_parent != NULL) {
rpl_timers_schedule_dao();
} else {
/* We have no more parent, schedule DIS to get a chance to hear updated state */
curr_instance.dag.state = DAG_INITIALIZED;
LOG_WARN("no parent, scheduling periodic DIS, will leave if no parent is found\n");
rpl_timers_dio_reset("Poison routes");
rpl_timers_schedule_periodic_dis();
rpl_timers_schedule_leaving();
}
#if LOG_INFO_ENABLED
rpl_neighbor_print_list("Parent switch");
#endif /* LOG_INFO_ENABLED */
}
nbr->better_parent_since = 0; /* Not a better parent */
}
nbr = nbr_table_next(rpl_neighbors, nbr);
}
/* Finally, update metric container */
curr_instance.of->update_metric_container();
if(old_parent == NULL || curr_instance.dag.rank < curr_instance.dag.lowest_rank) {
/* This is a slight departure from RFC6550: if we had no preferred parent before,
* reset lowest_rank. This helps recovering from temporary bad link conditions. */
curr_instance.dag.lowest_rank = curr_instance.dag.rank;
}
/* Reset DIO timer in case of significant rank update */
if(curr_instance.dag.last_advertised_rank != RPL_INFINITE_RANK
&& curr_instance.dag.rank != RPL_INFINITE_RANK
&& ABS((int32_t)curr_instance.dag.rank - curr_instance.dag.last_advertised_rank) > RPL_SIGNIFICANT_CHANGE_THRESHOLD) {
LOG_WARN("significant rank update %u->%u\n",
curr_instance.dag.last_advertised_rank, curr_instance.dag.rank);
/* Update already here to avoid multiple resets in a row */
curr_instance.dag.last_advertised_rank = curr_instance.dag.rank;
rpl_timers_dio_reset("Significant rank update");
}
/* Parent switch */
if(curr_instance.dag.preferred_parent != old_parent) {
/* We just got a parent (was NULL), reset trickle timer to advertise this */
if(old_parent == NULL) {
curr_instance.dag.state = DAG_JOINED;
rpl_timers_dio_reset("Got parent");
LOG_WARN("found parent: ");
LOG_WARN_6ADDR(rpl_neighbor_get_ipaddr(curr_instance.dag.preferred_parent));
LOG_WARN_(", staying in DAG\n");
rpl_timers_unschedule_leaving();
}
/* Schedule a DAO */
if(curr_instance.dag.preferred_parent != NULL) {
rpl_timers_schedule_dao();
} else {
/* We have no more parent, schedule DIS to get a chance to hear updated state */
curr_instance.dag.state = DAG_INITIALIZED;
LOG_WARN("no parent, scheduling periodic DIS, will leave if no parent is found\n");
rpl_timers_dio_reset("Poison routes");
rpl_timers_schedule_periodic_dis();
rpl_timers_schedule_leaving();
}
#if LOG_INFO_ENABLED
rpl_neighbor_print_list("Parent switch");
#endif /* LOG_INFO_ENABLED */
}
}
/* Finally, update metric container */
curr_instance.of->update_metric_container();
}
/*---------------------------------------------------------------------------*/
static rpl_nbr_t *

5
core/net/rpl-lite/rpl-dag.h
View File

@ -57,6 +57,11 @@
* \return The description string
*/
const char *rpl_dag_state_to_str(enum rpl_dag_state state);
/**
* Start poisoning and leave the DAG after a delay
*
*/
void rpl_dag_poison_and_leave(void);
/**
* Leaves the current DAG
*

17
core/net/rpl-lite/rpl-icmp6.c
View File

@ -557,10 +557,19 @@ rpl_icmp6_dao_output(uint8_t lifetime)
/* Make sure we're up-to-date before sending data out */
rpl_dag_update_state();
if(!curr_instance.used || curr_instance.dag.preferred_parent == NULL
|| prefix == NULL || parent_ipaddr == NULL || curr_instance.mop == RPL_MOP_NO_DOWNWARD_ROUTES) {
LOG_WARN("rpl_icmp6_dao_output: node not ready to send a DAO (used %u, pref parent %u, prefix %u, mop %u)\n",
curr_instance.used, curr_instance.dag.preferred_parent != NULL && parent_ipaddr != NULL, prefix != NULL, curr_instance.mop);
if(!curr_instance.used) {
LOG_WARN("rpl_icmp6_dao_output: not in an instance, skip sending DAO\n");
return;
}
if(curr_instance.dag.preferred_parent == NULL) {
LOG_WARN("rpl_icmp6_dao_output: no preferred parent, skip sending DAO\n");
return;
}
if(prefix == NULL || parent_ipaddr == NULL || curr_instance.mop == RPL_MOP_NO_DOWNWARD_ROUTES) {
LOG_WARN("rpl_icmp6_dao_output: node not ready to send a DAO (prefix %p, parent addr %p, mop %u)\n",
prefix, parent_ipaddr, curr_instance.mop);
return;
}