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Check for DAO fwd loop early, before processing DAO options

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This commit is contained in:
George Oikonomou 2013-08-28 14:12:41 +01:00
parent 3140f36356
commit 067bbc9ee0
1 changed files with 28 additions and 28 deletions
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56
core/net/rpl/rpl-icmp6.c
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@ -622,6 +622,34 @@ dao_input(void)
/* Perhaps, there are verification to do but ... */
}
learned_from = uip_is_addr_mcast(&dao_sender_addr) ?
RPL_ROUTE_FROM_MULTICAST_DAO : RPL_ROUTE_FROM_UNICAST_DAO;
PRINTF("RPL: DAO from %s\n",
learned_from == RPL_ROUTE_FROM_UNICAST_DAO? "unicast": "multicast");
if(learned_from == RPL_ROUTE_FROM_UNICAST_DAO) {
/* Check whether this is a DAO forwarding loop. */
p = rpl_find_parent(dag, &dao_sender_addr);
/* check if this is a new DAO registration with an "illegal" rank */
/* if we already route to this node it is likely */
if(p != NULL &&
DAG_RANK(p->rank, instance) < DAG_RANK(dag->rank, instance)) {
PRINTF("RPL: Loop detected when receiving a unicast DAO from a node with a lower rank! (%u < %u)\n",
DAG_RANK(p->rank, instance), DAG_RANK(dag->rank, instance));
p->rank = INFINITE_RANK;
p->updated = 1;
return;
}
/* If we get the DAO from our parent, we also have a loop. */
if(p != NULL && p == dag->preferred_parent) {
PRINTF("RPL: Loop detected when receiving a unicast DAO from our parent\n");
p->rank = INFINITE_RANK;
p->updated = 1;
return;
}
}
/* Check if there are any RPL options present. */
for(i = pos; i < buffer_length; i += len) {
subopt_type = buffer[i];
@ -687,34 +715,6 @@ dao_input(void)
return;
}
learned_from = uip_is_addr_mcast(&dao_sender_addr) ?
RPL_ROUTE_FROM_MULTICAST_DAO : RPL_ROUTE_FROM_UNICAST_DAO;
PRINTF("RPL: DAO from %s\n",
learned_from == RPL_ROUTE_FROM_UNICAST_DAO? "unicast": "multicast");
if(learned_from == RPL_ROUTE_FROM_UNICAST_DAO) {
/* Check whether this is a DAO forwarding loop. */
p = rpl_find_parent(dag, &dao_sender_addr);
/* check if this is a new DAO registration with an "illegal" rank */
/* if we already route to this node it is likely */
if(p != NULL &&
DAG_RANK(p->rank, instance) < DAG_RANK(dag->rank, instance)) {
PRINTF("RPL: Loop detected when receiving a unicast DAO from a node with a lower rank! (%u < %u)\n",
DAG_RANK(p->rank, instance), DAG_RANK(dag->rank, instance));
p->rank = INFINITE_RANK;
p->updated = 1;
return;
}
/* If we get the DAO from our parent, we also have a loop. */
if(p != NULL && p == dag->preferred_parent) {
PRINTF("RPL: Loop detected when receiving a unicast DAO from our parent\n");
p->rank = INFINITE_RANK;
p->updated = 1;
return;
}
}
PRINTF("RPL: adding DAO route\n");
if((nbr = uip_ds6_nbr_lookup(&dao_sender_addr)) == NULL) {