child-sa: Add a new state to track rekeyed IKEv1 CHILD_SAs

This is needed to handle DELETEs properly, which was previously done via
CHILD_REKEYING, which we don't use anymore since 5c6a62ceb6 as it prevents
reauthentication.

src/libcharon/sa/ikev1/tasks/quick_delete.c

@@ -105,7 +105,7 @@ static bool delete_child(private_quick_delete_t *this, protocol_id_t protocol,
 		this->spi = spi = child_sa->get_spi(child_sa, TRUE);
 	}
 
-	rekeyed = child_sa->get_state(child_sa) == CHILD_REKEYING;
+	rekeyed = child_sa->get_state(child_sa) == CHILD_REKEYED;
 	child_sa->set_state(child_sa, CHILD_DELETING);
 
 	my_ts = linked_list_create_from_enumerator(

src/libcharon/sa/ikev1/tasks/quick_mode.c

@@ -402,7 +402,7 @@ static bool install(private_quick_mode_t *this)
 	{
 		charon->bus->child_rekey(charon->bus, old, this->child_sa);
 		/* rekeyed CHILD_SAs stay installed until they expire */
-		old->set_state(old, CHILD_INSTALLED);
+		old->set_state(old, CHILD_REKEYED);
 	}
 	else
 	{
@@ -988,6 +988,7 @@ static void check_for_rekeyed_child(private_quick_mode_t *this)
 			{
 				case CHILD_INSTALLED:
 				case CHILD_REKEYING:
+				case CHILD_REKEYED:
 					policies = child_sa->create_policy_enumerator(child_sa);
 					if (policies->enumerate(policies, &local, &remote) &&
 						local->equals(local, this->tsr) &&