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RPL non-storing: more conservative DTSN update, as per RFC 6550, section 9.6.

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This commit is contained in:
Simon Duquennoy 2016-11-25 16:30:08 +01:00
parent 52a8dcc65b
commit 3e00adacc0
1 changed files with 18 additions and 8 deletions
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26
core/net/rpl/rpl-dag.c
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@ -309,7 +309,7 @@ nullify_parents(rpl_dag_t *dag, rpl_rank_t minimum_rank)
}
/*---------------------------------------------------------------------------*/
static int
should_send_dao(rpl_instance_t *instance, rpl_dio_t *dio, rpl_parent_t *p)
should_refresh_routes(rpl_instance_t *instance, rpl_dio_t *dio, rpl_parent_t *p)
{
/* if MOP is set to no downward routes no DAO should be sent */
if(instance->mop == RPL_MOP_NO_DOWNWARD_ROUTES) {
@ -827,12 +827,16 @@ rpl_select_dag(rpl_instance_t *instance, rpl_parent_t *p)
PRINTF("RPL: Changed preferred parent, rank changed from %u to %u\n",
(unsigned)old_rank, best_dag->rank);
RPL_STAT(rpl_stats.parent_switch++);
if(RPL_IS_STORING(instance) && last_parent != NULL) {
/* Send a No-Path DAO to the removed preferred parent. */
dao_output(last_parent, RPL_ZERO_LIFETIME);
if(RPL_IS_STORING(instance)) {
if(last_parent != NULL) {
/* Send a No-Path DAO to the removed preferred parent. */
dao_output(last_parent, RPL_ZERO_LIFETIME);
}
/* Trigger DAO transmission from immediate children.
* Only for storing mode, see RFC6550 section 9.6. */
RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
}
/* The DAO parent set changed - schedule a DAO transmission. */
RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
rpl_schedule_dao(instance);
rpl_reset_dio_timer(instance);
#if DEBUG
@ -1318,8 +1322,12 @@ rpl_local_repair(rpl_instance_t *instance)
instance->has_downward_route = 0;
rpl_reset_dio_timer(instance);
/* Request refresh of DAO registrations next DIO */
RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
if(RPL_IS_STORING(instance)) {
/* Request refresh of DAO registrations next DIO. Only for storing mode. In
* non-storing mode, non-root nodes increment DTSN only on when their parent do,
* or on global repair (see RFC6550 section 9.6.) */
RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
}
RPL_STAT(rpl_stats.local_repairs++);
}
@ -1604,7 +1612,9 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
/* We don't use route control, so we can have only one official parent. */
if(dag->joined && p == dag->preferred_parent) {
if(should_send_dao(instance, dio, p)) {
if(should_refresh_routes(instance, dio, p)) {
/* Our parent is requesting a new DAO. Increment DTSN in turn,
* in both storing and non-storing mode (see RFC6550 section 9.6.) */
RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
rpl_schedule_dao(instance);
}