From 9af596648fee6618dbaab7eb2b1b5625d23445dd Mon Sep 17 00:00:00 2001 From: Donatas Abraitis Date: Mon, 23 Oct 2023 11:24:12 +0300 Subject: [PATCH] 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 --- ospf6d/ospf6_interface.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c index 0fb3d29e254f..36680ea87b6a 100644 --- a/ospf6d/ospf6_interface.c +++ b/ospf6d/ospf6_interface.c @@ -128,9 +128,19 @@ static uint8_t ospf6_default_iftype(struct interface *ifp) static uint32_t ospf6_interface_get_cost(struct ospf6_interface *oi) { /* If all else fails, use default OSPF cost */ - uint32_t cost; + uint32_t cost = 0; uint32_t bw, refbw; struct ospf6 *ospf6; + + /* 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)) + return cost; + /* interface speed and bw can be 0 in some platforms, * use ospf default bw. If bw is configured then it would * be used.