OSPF: Allow ifaces with host address as unnumbered PtP or PtMP ifaces

Ifaces with host address (/32) were forced to be stubby, but now they
can be used as PtP or PtMP. For these ifaces we need to:

 - Do not force stub mode
 - Accept packets from any IP as local
 - Accept any configured neighbor as local
 - Detect ifaces properly as unnumbered
 - Use ONLINK flag for nexthops

1 files changed, 8 insertions, 0 deletions

diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index fd2347e5..3e704ae8 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -946,6 +946,14 @@ struct lsadb_show_data {
 #define EA_OSPF_ROUTER_ID EA_CODE(PROTOCOL_OSPF, 3)
 
 
+/*
+ * For regular networks, neighbor address must match network prefix.
+ * For unnumbered networks, we consider every address local.
+ */
+static inline int ospf_ipa_local(ip_addr a, const struct ifa *addr)
+{ return ipa_in_netX(a, &addr->prefix) || (addr->flags & IA_HOST); }
+
+
 /* ospf.c */
 void ospf_schedule_rtcalc(struct ospf_proto *p);