interface-ip: install routes after IPv6 prefix address setup

In interface_ip_set_enabled(), routes are currently installed after IP
addresses are set up, but before IPv6 prefix addresses are set up.  This
prevents configured static IPv6 routes that have next hops set to
addresses belonging to those prefixes from being installed during
interface setup as the relevant netlink requests return -EHOSTUNREACH
(No route to host).  Fix by deferring route installation until after
IPv6 prefix addresses are configured.

Signed-off-by: Michał Kępień <michal@isc.org>

Author: kempniu

interface-ip.c

@@ -1727,12 +1727,6 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 		addr->enabled = enabled;
 	}
 
-	vlist_for_each_element(&ip->route, route, node)
-		interface_ip_set_route_enabled(ip, route, enabled);
-	if (ip == &iface->proto_ip)
-		vlist_for_each_element(&iface->host_routes, route, node)
-			interface_ip_set_route_enabled(ip, route, enabled);
-
 	vlist_for_each_element(&ip->neighbor, neighbor, node) {
 		if (neighbor->enabled == enabled)
 			continue;
@@ -1753,6 +1747,12 @@ void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 			if (!strcmp(a->name, ip->iface->name))
 				interface_set_prefix_address(a, c, ip->iface, enabled);
 
+	vlist_for_each_element(&ip->route, route, node)
+		interface_ip_set_route_enabled(ip, route, enabled);
+	if (ip == &iface->proto_ip)
+		vlist_for_each_element(&iface->host_routes, route, node)
+			interface_ip_set_route_enabled(ip, route, enabled);
+
 	if (ip->iface->policy_rules_set != enabled &&
 	    ip->iface->l3_dev.dev) {
 		if (ip->iface->l3_dev.dev->settings.ipv6) {