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Updated DAG version processing to occur even for infinite rank DIOs. This makes it possible for the RPL root to infer the DAG version number from a network that hasn't had a root for a while, and where the rank has increased to infinity.

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This commit is contained in:
Adam Dunkels 2012-11-26 19:31:44 +01:00
parent db7cb567f5
commit 15deb37e64
1 changed files with 26 additions and 22 deletions
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48
core/net/rpl/rpl-dag.c
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@ -1096,6 +1096,32 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
return;
}
dag = get_dag(dio->instance_id, &dio->dag_id);
instance = rpl_get_instance(dio->instance_id);
if(dag != NULL && instance != NULL) {
if(lollipop_greater_than(dio->version, dag->version)) {
if(dag->rank == ROOT_RANK(instance)) {
PRINTF("RPL: Root received inconsistent DIO version number\n");
dag->version = dio->version;
RPL_LOLLIPOP_INCREMENT(dag->version);
rpl_reset_dio_timer(instance);
} else {
global_repair(from, dag, dio);
}
return;
}
if(lollipop_greater_than(dag->version, dio->version)) {
/* The DIO sender is on an older version of the DAG. */
PRINTF("RPL: old version received => inconsistency detected\n");
if(dag->joined) {
rpl_reset_dio_timer(instance);
return;
}
}
}
if(dio->rank == INFINITE_RANK) {
PRINTF("RPL: Ignoring DIO from node with infinite rank: ");
PRINT6ADDR(from);
@ -1103,40 +1129,18 @@ rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
return;
}
instance = rpl_get_instance(dio->instance_id);
if(instance == NULL) {
PRINTF("RPL: New instance detected: Joining...\n");
rpl_join_instance(from, dio);
return;
}
dag = get_dag(dio->instance_id, &dio->dag_id);
if(dag == NULL) {
PRINTF("RPL: Adding new DAG to known instance.\n");
rpl_add_dag(from, dio);
return;
}
if(lollipop_greater_than(dio->version, dag->version)) {
if(dag->rank == ROOT_RANK(instance)) {
PRINTF("RPL: Root received inconsistent DIO version number\n");
dag->version = dio->version;
RPL_LOLLIPOP_INCREMENT(dag->version);
rpl_reset_dio_timer(instance);
} else {
global_repair(from, dag, dio);
}
return;
}
if(lollipop_greater_than(dag->version, dio->version)) {
/* The DIO sender is on an older version of the DAG. */
PRINTF("RPL: old version received => inconsistency detected\n");
if(dag->joined) {
rpl_reset_dio_timer(instance);
return;
}
}
if(dio->rank < ROOT_RANK(instance)) {
PRINTF("RPL: Ignoring DIO with too low rank: %u\n",