Add a neighbor table entry if a DAO is received from a node where we don't yet have a neighbor table entry.

core/net/rpl/rpl-private.h

@@ -304,6 +304,9 @@ uip_ds6_route_t *rpl_add_route(rpl_dag_t *dag, uip_ipaddr_t *prefix,
                                int prefix_len, uip_ipaddr_t *next_hop);
 void rpl_purge_routes(void);
 
+/* Lock a parent in the neighbor cache. */
+void rpl_lock_parent(rpl_parent_t *p);
+
 /* Objective function. */
 rpl_of_t *rpl_find_of(rpl_ocp_t);