From 4f01d08765ee2d031e703e3201a07793247fa323 Mon Sep 17 00:00:00 2001 From: Brent Cook Date: Sat, 13 Aug 2016 14:22:02 -0500 Subject: [PATCH 13/14] set IPV6_V6ONLY if we are binding to an IPv6 address --- src/usr.sbin/ntpd/server.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/usr.sbin/ntpd/server.c b/src/usr.sbin/ntpd/server.c index 8c18eb7610..9eab1a74bf 100644 --- a/src/usr.sbin/ntpd/server.c +++ b/src/usr.sbin/ntpd/server.c @@ -42,6 +42,9 @@ setup_listeners(struct servent *se, struct ntpd_conf *lconf, u_int *cnt) size_t sa6len = sizeof(struct in6_addr); u_int new_cnt = 0; int tos = IPTOS_LOWDELAY; +#ifdef IPV6_V6ONLY + int on = 1; +#endif #ifdef SO_RTABLE int rdomain = 0; #endif @@ -134,6 +137,12 @@ setup_listeners(struct servent *se, struct ntpd_conf *lconf, u_int *cnt) IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) log_warn("setsockopt IPTOS_LOWDELAY"); +#ifdef IPV6_V6ONLY + if (la->sa.ss_family == AF_INET6 && setsockopt(la->fd, + IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1) + log_warn("setsockopt IPV6_V6ONLY"); +#endif + #ifdef SO_RTABLE if (la->rtable != -1 && setsockopt(la->fd, SOL_SOCKET, SO_RTABLE, &la->rtable, -- 2.20.1