From a49f87d13c19deac6e87761b349d96038b3acdfc Mon Sep 17 00:00:00 2001
From: Jun-ichiro itojun Hagino <itojun@cvs.openbsd.org>
Date: Fri, 22 Jun 2001 14:12:37 +0000
Subject: re-select default router on linklayer addrss changes.  sync with
 kame.

---
 sys/netinet6/nd6.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'sys')

diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index 394dcbb5029..bc43199e18c 100644
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -1,5 +1,5 @@
-/*	$OpenBSD: nd6.c,v 1.34 2001/06/09 06:43:38 angelos Exp $	*/
-/*	$KAME: nd6.c,v 1.137 2001/03/21 21:52:06 jinmei Exp $	*/
+/*	$OpenBSD: nd6.c,v 1.35 2001/06/22 14:12:36 itojun Exp $	*/
+/*	$KAME: nd6.c,v 1.151 2001/06/19 14:24:41 sumikawa Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -1745,6 +1745,21 @@ fail:
 		break;
 	}
 
+	/*
+	 * When the link-layer address of a router changes, select the
+	 * best router again.  In particular, when the neighbor entry is newly
+	 * created, it might affect the selection policy.
+	 * Question: can we restrict the first condition to the "is_newentry"
+	 * case?
+	 * XXX: when we hear an RA from a new router with the link-layer
+	 * address option, defrouter_select() is called twice, since
+	 * defrtrlist_update called the function as well.  However, I believe
+	 * we can compromise the overhead, since it only happens the first
+	 * time.
+	 */
+	if (do_update && ln->ln_router)
+		defrouter_select();
+
 	return rt;
 }
 
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