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From a1b544e4c2f444bdeb29e335a498b7fb822db9c2 Mon Sep 17 00:00:00 2001
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From: Brent Cook <bcook@openbsd.org>
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Date: Sat, 13 Aug 2016 14:22:02 -0500
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Subject: [PATCH 13/18] set IPV6_V6ONLY if we are binding to an IPv6 address
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---
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src/usr.sbin/ntpd/server.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/src/usr.sbin/ntpd/server.c b/src/usr.sbin/ntpd/server.c
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index 8c18eb7610..9eab1a74bf 100644
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--- a/src/usr.sbin/ntpd/server.c
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+++ b/src/usr.sbin/ntpd/server.c
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@@ -42,6 +42,9 @@ setup_listeners(struct servent *se, struct ntpd_conf *lconf, u_int *cnt)
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size_t sa6len = sizeof(struct in6_addr);
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u_int new_cnt = 0;
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int tos = IPTOS_LOWDELAY;
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+#ifdef IPV6_V6ONLY
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+ int on = 1;
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+#endif
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#ifdef SO_RTABLE
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int rdomain = 0;
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#endif
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@@ -134,6 +137,12 @@ setup_listeners(struct servent *se, struct ntpd_conf *lconf, u_int *cnt)
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IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1)
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log_warn("setsockopt IPTOS_LOWDELAY");
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+#ifdef IPV6_V6ONLY
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+ if (la->sa.ss_family == AF_INET6 && setsockopt(la->fd,
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+ IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
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+ log_warn("setsockopt IPV6_V6ONLY");
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+#endif
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+
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#ifdef SO_RTABLE
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if (la->rtable != -1 &&
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setsockopt(la->fd, SOL_SOCKET, SO_RTABLE, &la->rtable,
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--
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2.27.0
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