If the next hop of a route is not a reachable address, the route should be
installed as onlink. This enables a configuration common in mesh networks
where the mesh interface is assigned a /32 and babel handles the routing by
installing onlink routes.
Thanks to Toke Hoiland-Jorgensen for the patch.
.nh.iface = r->neigh->ifa->iface,
};
+ /*
+ * If we cannot find a reachable neighbour, set the entry to be onlink. This
+ * makes it possible to, e.g., assign /32 addresses on a mesh interface and
+ * have routing work.
+ */
+ if (!neigh_find(&p->p, r->next_hop, r->neigh->ifa->iface, 0))
+ a0.nh.flags = RNF_ONLINK;
+
rta *a = rta_lookup(&a0);
rte *rte = rte_get_temp(a);
rte->u.babel.seqno = r->seqno;