From 7a2f6b4f2072740fac3d723555d8c713deca1a96 Mon Sep 17 00:00:00 2001
From: ume <ume@FreeBSD.org>
Date: Wed, 24 Jul 2002 19:19:53 +0000
Subject: [PATCH] make sure to set/unset INP_IPV4 according to a value of
 IN6P_IPV6_V6ONLY

Reviewed by:	Keiichi SHIMA <keiichi@iij.ad.jp>
---
 sys/netinet6/ip6_output.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/netinet6/ip6_output.c b/sys/netinet6/ip6_output.c
index 08ef3d8c3d1d..52f3e5ef55af 100644
--- a/sys/netinet6/ip6_output.c
+++ b/sys/netinet6/ip6_output.c
@@ -1377,6 +1377,10 @@ do { \
 						break;
 					}
 					OPTSET(IN6P_IPV6_V6ONLY);
+					if (optval)
+						in6p->in6p_vflag &= ~INP_IPV4;
+					else
+						in6p->in6p_vflag |= INP_IPV4;
 					break;
 				}
 				break;