core: use router preference for IPv6 routes

For routes and the default-route from NDisc, set the router preference
RTA_PREF.

Also, previously, we would only configure one IPv6 default-route. That by itself
was not really a problem, as long as NetworkManager would always make sure that
it configured the route to the ~best~ router.

Actually, NM should have done that already. It keeps the list of gateways
sorted, and prefers them according to their preference. But maybe
it didn't, so we have bug rh#1445417 (??).

Change that by configuring a default-route for all gateways, with
appropriate router prefrence. In case, kernel doesn't support RTA_PREF
yet, only configure all routes that share the same maxiumum preference.

https://bugzilla.redhat.com/show_bug.cgi?id=1445417

1 files changed, 2 insertions, 1 deletions

diff --git a/src/nm-ip6-config.h b/src/nm-ip6-config.h
index c55ee31ea9..2fb8b8a4ad 100644
--- a/src/nm-ip6-config.h
+++ b/src/nm-ip6-config.h
@@ -219,6 +219,7 @@ void nm_ip6_config_reset_routes_ndisc (NMIP6Config *self,
                                        const struct _NMNDiscRoute *routes,
                                        guint routes_n,
                                        guint32 route_table,
-                                       guint32 route_metric);
+                                       guint32 route_metric,
+                                       gboolean kernel_support_rta_pref);
 
 #endif /* __NETWORKMANAGER_IP6_CONFIG_H__ */