ospf6d: add overload support

OSPFv3: Support setting/clearing overload bit on router

It is sometimes necessary for a router to gracefully remove itself from
the SPF tree i.e. it cannot act as a transit router. It does this by
setting the overload bit in the router LSA. This patch adds support for
enabling/disabling the overload bit.

Signed-off-by: Dinesh G Dutt <ddutt at cumulusnetworks.com>
Reviewed-by: Pradosh Mohapatra <pmohapat at cumulusnetworks.com>
[DL: patch applied with fuzz]
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/ospf6d/ospf6_intra.c b/ospf6d/ospf6_intra.c
index c08a6ae6..025a7710 100644
--- a/ospf6d/ospf6_intra.c
+++ b/ospf6d/ospf6_intra.c
@@ -105,6 +105,29 @@ ospf6_router_lsa_show (struct vty *vty, struct ospf6_lsa *lsa)
 }
 
 int
+ospf6_router_is_stub_router (struct ospf6_lsa *lsa)
+{
+  struct ospf6_router_lsa *rtr_lsa;
+
+  if (lsa != NULL && OSPF6_LSA_IS_TYPE (ROUTER, lsa))
+    {
+      rtr_lsa = (struct ospf6_router_lsa *)
+	((caddr_t) lsa->header + sizeof (struct ospf6_lsa_header));
+
+      if (!OSPF6_OPT_ISSET (rtr_lsa->options, OSPF6_OPT_R))
+	{
+	  return (OSPF6_IS_STUB_ROUTER);
+	}
+      else if (!OSPF6_OPT_ISSET (rtr_lsa->options, OSPF6_OPT_V6))
+	{
+	  return (OSPF6_IS_STUB_ROUTER_V6);
+	}
+    }
+
+  return (OSPF6_NOT_STUB_ROUTER);
+}
+
+int
 ospf6_router_lsa_originate (struct thread *thread)
 {
   struct ospf6_area *oa;