415 lines
17 KiB
C
415 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $
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*/
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/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)in_proto.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include "opt_ipstealth.h"
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#include "opt_sctp.h"
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#include "opt_route.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/domain.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet6/in6_var.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#include <netinet6/raw_ip6.h>
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/* netinet6/raw_ip6.c */
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extern struct protosw rip6_protosw;
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/* netinet6/udp6_usrreq.c */
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extern struct protosw udp6_protosw, udplite6_protosw;
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/* netinet/tcp_usrreq.c */
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extern struct protosw tcp6_protosw;
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/* netinet/sctp6_usrreq.c */
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extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw;
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/*
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* TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
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*/
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FEATURE(inet6, "Internet Protocol version 6");
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struct domain inet6domain = {
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.dom_family = AF_INET6,
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.dom_name = "internet6",
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.dom_rtattach = in6_inithead,
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#ifdef VIMAGE
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.dom_rtdetach = in6_detachhead,
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#endif
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.dom_ifattach = in6_domifattach,
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.dom_ifdetach = in6_domifdetach,
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.dom_ifmtu = in6_domifmtu,
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.dom_nprotosw = 14,
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.dom_protosw = {
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&tcp6_protosw,
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&udp6_protosw,
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#ifdef SCTP
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&sctp6_seqpacket_protosw,
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&sctp6_stream_protosw,
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#else
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NULL, NULL,
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#endif
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&udplite6_protosw,
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&rip6_protosw,
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/* Spacer 8 times for loadable protocols. XXXGL: why 8? */
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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},
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};
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DOMAIN_SET(inet6);
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/*
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* Internet configuration info
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*/
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#ifndef IPV6FORWARDING
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#ifdef GATEWAY6
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#define IPV6FORWARDING 1 /* forward IP6 packets not for us */
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#else
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#define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
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#endif /* GATEWAY6 */
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#endif /* !IPV6FORWARDING */
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#ifndef IPV6_SENDREDIRECTS
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#define IPV6_SENDREDIRECTS 1
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#endif
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VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */
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VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS;
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VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM;
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VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
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VNET_DEFINE(int, ip6_accept_rtadv) = 0;
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VNET_DEFINE(int, ip6_no_radr) = 0;
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VNET_DEFINE(int, ip6_norbit_raif) = 0;
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VNET_DEFINE(int, ip6_rfc6204w3) = 0;
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VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
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* process? */
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VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */
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VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
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VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
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* (RFC2462 5.5.4) */
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VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix
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* walk list every 5 sec. */
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VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */
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VNET_DEFINE(int, ip6_v6only) = 1;
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#ifdef IPSTEALTH
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VNET_DEFINE(int, ip6stealth) = 0;
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#endif
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VNET_DEFINE(int, nd6_onlink_ns_rfc4861) = 0;/* allow 'on-link' nd6 NS
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* (RFC 4861) */
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VNET_DEFINE(bool, ip6_log_cannot_forward) = 1;
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/* icmp6 */
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/*
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* BSDI4 defines these variables in in_proto.c...
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* XXX: what if we don't define INET? Should we define pmtu6_expire
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* or so? (jinmei@kame.net 19990310)
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*/
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VNET_DEFINE(int, pmtu_expire) = 60*10;
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VNET_DEFINE(int, pmtu_probe) = 60*2;
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/* ICMPV6 parameters */
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VNET_DEFINE(int, icmp6_rediraccept) = 1;/* accept and process redirects */
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VNET_DEFINE(int, icmp6_redirtimeout) = 10 * 60; /* 10 minutes */
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VNET_DEFINE(int, icmp6errppslim) = 100; /* 100pps */
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/* control how to respond to NI queries */
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VNET_DEFINE(int, icmp6_nodeinfo) = 0;
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VNET_DEFINE(int, icmp6_nodeinfo_oldmcprefix) = 1;
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VNET_DEFINE_STATIC(int, ip6_log_interval) = 5;
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VNET_DEFINE_STATIC(int, ip6_log_count) = 0;
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VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 };
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#define V_ip6_log_interval VNET(ip6_log_interval)
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#define V_ip6_log_count VNET(ip6_log_count)
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#define V_ip6_log_last VNET(ip6_log_last)
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/*
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* sysctl related items.
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*/
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SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"Internet6 Family");
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/* net.inet6 */
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SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"IP6");
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SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"ICMP6");
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SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"UDP6");
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SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"TCP6");
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#if defined(SCTP) || defined(SCTP_SUPPORT)
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SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"SCTP6");
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#endif
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#if defined(IPSEC) || defined(IPSEC_SUPPORT)
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SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"IPSEC6");
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#endif /* IPSEC */
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/* net.inet6.ip6 */
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static int
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sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
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{
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int error, val;
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val = V_ip6_temp_preferred_lifetime;
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error = sysctl_handle_int(oidp, &val, 0, req);
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if (error != 0 || !req->newptr)
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return (error);
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if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance)
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return (EINVAL);
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V_ip6_temp_preferred_lifetime = val;
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return (0);
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}
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static int
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sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
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{
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int error, val;
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val = V_ip6_temp_valid_lifetime;
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error = sysctl_handle_int(oidp, &val, 0, req);
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if (error != 0 || !req->newptr)
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return (error);
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if (val < V_ip6_temp_preferred_lifetime)
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return (EINVAL);
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V_ip6_temp_valid_lifetime = val;
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return (0);
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}
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int
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ip6_log_ratelimit(void)
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{
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return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count,
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V_ip6_log_interval));
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}
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
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"Enable forwarding of IPv6 packets between interfaces");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
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"Send ICMPv6 redirects for unforwardable IPv6 packets");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
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"Default hop limit to use for outgoing IPv6 packets");
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SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
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ip6stat,
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"IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_accept_rtadv), 0,
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"Default value of per-interface flag for accepting ICMPv6 RA messages");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_no_radr), 0,
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"Default value of per-interface flag to control whether routers "
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"sending ICMPv6 RA messages on that interface are added into the "
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"default router list");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
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"Always set clear the R flag in ICMPv6 NA messages when accepting RA "
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"on the interface");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
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"Accept the default router list from ICMPv6 RA messages even "
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"when packet forwarding is enabled");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
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"Frequency in seconds at which to log IPv6 forwarding errors");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
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"Default maximum number of IPv6 extension headers permitted on "
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"incoming IPv6 packets, 0 for no artificial limit");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
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"Number of ICMPv6 NS messages sent during duplicate address detection");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
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"Provide an IPv6 flowlabel in outbound packets");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
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"Default hop limit for IPv6 multicast packets originating from this "
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"node");
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SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
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CTLFLAG_RD, __KAME_VERSION, 0,
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"KAME version string");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
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"Allow the use of addresses whose preferred lifetimes have expired");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
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""); /* XXX unused */
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
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"Create RFC3041 temporary addresses for autoconfigured addresses");
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SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
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CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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NULL, 0, sysctl_ip6_temppltime, "I",
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"Maximum preferred lifetime for temporary addresses");
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SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
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CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
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NULL, 0, sysctl_ip6_tempvltime, "I",
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"Maximum valid lifetime for temporary addresses");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
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"Restrict AF_INET6 sockets to IPv6 addresses only");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0,
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"Default value of per-interface flag for automatically adding an IPv6 "
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"link-local address to interfaces when attached");
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SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
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struct rip6stat, rip6stat,
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"Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
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"Prefer RFC3041 temporary addresses in source address selection");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
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"Use the default scope zone when none is specified");
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
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"Enable path MTU discovery for multicast packets");
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#ifdef IPSTEALTH
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip6stealth), 0,
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"Forward IPv6 packets without decrementing their TTL");
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#endif
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SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO,
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log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip6_log_cannot_forward), 1,
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"Log packets that cannot be forwarded");
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/* net.inet6.icmp6 */
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0,
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"Accept ICMPv6 redirect messages");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0,
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"Delay in seconds before expiring redirect route");
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SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats,
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struct icmp6stat, icmp6stat,
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"ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0,
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"Frequency in seconds of checks for expired prefixes and routers");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0,
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"Delay in seconds before probing for reachability");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0,
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"Number of ICMPv6 NS messages sent during reachability detection");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0,
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"Number of ICMPv6 NS messages sent during address resolution");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0,
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"Create a loopback route when configuring an IPv6 address");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0,
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"Mask of enabled RFC4620 node information query types");
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SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX,
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nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0,
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|
"Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup "
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|
"for compatibility with KAME implementation");
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|
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit,
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|
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0,
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|
"Maximum number of ICMPv6 error messages per second");
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|
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint,
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|
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxnudhint), 0,
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|
""); /* XXX unused */
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|
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug,
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|
CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0,
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|
"Log NDP debug messages");
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|
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
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nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(nd6_onlink_ns_rfc4861), 0,
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|
"Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
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|
#ifdef EXPERIMENTAL
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SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
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nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW,
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|
&VNET_NAME(nd6_ignore_ipv6_only_ra), 0,
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|
"Ignore the 'IPv6-Only flag' in RA messages in compliance with "
|
|
"draft-ietf-6man-ipv6only-flag");
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#endif
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