From a25da23509f586c987f1af450566f0cda14d5d87 Mon Sep 17 00:00:00 2001
From: itojun <itojun@NetBSD.org>
Date: Tue, 21 Mar 2000 11:05:12 +0000
Subject: [PATCH] #if 0'ed too strong sanity check against packets with v4
 compatible addresses. we may want to re-enable it whenever mech-xx clarifies
 router behavior against native IPv6 packet with IPv4 compatible addresses.

---
 sys/netinet6/ip6_input.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/sys/netinet6/ip6_input.c b/sys/netinet6/ip6_input.c
index e7e427481843..4d1d3d5d07e2 100644
--- a/sys/netinet6/ip6_input.c
+++ b/sys/netinet6/ip6_input.c
@@ -1,4 +1,5 @@
-/*	$NetBSD: ip6_input.c,v 1.16 2000/02/20 00:56:43 darrenr Exp $	*/
+/*	$NetBSD: ip6_input.c,v 1.17 2000/03/21 11:05:12 itojun Exp $	*/
+/*	$KAME: ip6_input.c,v 1.72 2000/03/21 09:23:19 itojun Exp $	*/
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -369,9 +370,13 @@ ip6_input(m)
 		in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
 		goto bad;
 	}
-#if 1
+#if 0
 	/*
-	 * We don't support it, so it is strange to get this.
+	 * Reject packets with IPv4 compatible addresses (auto tunnel).
+	 *
+	 * The code forbids auto tunnel relay case in RFC1933 (the check is
+	 * stronger than RFC1933).  We may want to re-enable it if mech-xx
+	 * is revised to forbid relaying case.
 	 */
 	if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
 	    IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {