3 files changed, 27 insertions, 7 deletions

diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index 987698e7..b30a8112 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -423,7 +423,7 @@ ospf_iface_new(struct proto_ospf *po, struct iface *iface, struct ifa *addr,
   ifa->strictnbma = ip->strictnbma;
   ifa->waitint = ip->waitint;
   ifa->dead = (ip->dead == 0) ? ip->deadc * ifa->helloint : ip->dead;
-  ifa->stub = ip->stub;
+  ifa->stub = ospf_iface_stubby(ip, addr);
   ifa->ioprob = OSPF_I_OK;
   ifa->rxbuf = ip->rxbuf;
 
diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index e77156b7..e8245110 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -763,16 +763,17 @@ ospf_reconfigure(struct proto *p, struct proto_config *c)
 	}
 
 	/* stub */
-	if ((oldip->stub == 0) && (newip->stub != 0))
+	int old_stub = ospf_iface_stubby(oldip, ifa->addr);
+	int new_stub = ospf_iface_stubby(newip, ifa->addr);
+	if (!old_stub && new_stub)
 	{
-	  ifa->stub = newip->stub;
+	  ifa->stub = 1;
 	  OSPF_TRACE(D_EVENTS, "Interface %s is now stub.", ifa->iface->name);
 	}
-	if ((oldip->stub != 0) && (newip->stub == 0) && (ifa->ioprob == OSPF_I_OK))
+	if (old_stub && !new_stub && (ifa->ioprob == OSPF_I_OK))
 	{
-	  ifa->stub = newip->stub;
-	  OSPF_TRACE(D_EVENTS,
-		     "Interface %s is no longer stub.", ifa->iface->name);
+	  ifa->stub = 0;
+	  OSPF_TRACE(D_EVENTS, "Interface %s is no longer stub.", ifa->iface->name);
 	}
 
 #ifdef OSPFv2	
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index 9e02d758..ef51b9fd 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -772,6 +772,25 @@ struct ospf_iface_patt
 #endif
 };
 
+#if defined(OSPFv2) && !defined(CONFIG_MC_PROPER_SRC)
+static inline int
+ospf_iface_stubby(struct ospf_iface_patt *ip, struct ifa *addr)
+{
+  /*
+   * We cannot properly support multiple OSPF ifaces on real iface
+   * with multiple prefixes, therefore we force OSPF ifaces with
+   * non-primary IP prefixes to be stub.
+   */
+  return ip->stub || !(addr->flags & IA_PRIMARY);
+}
+#else
+static inline int
+ospf_iface_stubby(struct ospf_iface_patt *ip, struct ifa *addr UNUSED)
+{
+  return ip->stub;
+}
+#endif
+
 int ospf_import_control(struct proto *p, rte **new, ea_list **attrs,
 			struct linpool *pool);
 struct ea_list *ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool);