ospf6d: Set loopback interface cost to 0

https://www.rfc-editor.org/rfc/rfc5340.html#page-37 states: If the interface type is point- to-multipoint or the interface is in the state Loopback, the global scope IPv6 addresses associated with the interface (if any) are copied into the intra-area-prefix-LSA with the PrefixOptions LA-bit set, the PrefixLength set to 128, and the metric set to 0. Signed-off-by: Donatas Abraitis <[email protected]>
FRRouting · Oct 23, 2023 · fa3140f · fa3140f
1 parent e1c119b
commit fa3140f
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c
@@ -154,6 +154,15 @@ static uint32_t ospf6_interface_get_cost(struct ospf6_interface *oi)
 			cost = 1;
 	}
 
+	/* If the interface type is point-to-multipoint or the interface
+	 * is in the state Loopback, the global scope IPv6 addresses
+	 * associated with the interface (if any) are copied into the
+	 * intra-area-prefix-LSA with the PrefixOptions LA-bit set, the
+	 * PrefixLength set to 128, and the metric set to 0.
+	 */
+	if (if_is_loopback(oi->interface))
+		cost = 0;
+
 	return cost;
 }