freebsd/sys/netinet6/in6_proto.c

/*-
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $
 */

/*-
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)in_proto.c	8.1 (Berkeley) 6/10/93
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_ipstealth.h"
#include "opt_carp.h"
#include "opt_sctp.h"
#include "opt_mpath.h"

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/vimage.h>

#include <net/if.h>
#include <net/radix.h>
#include <net/route.h>
#ifdef RADIX_MPATH
#include <net/radix_mpath.h>
#endif

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>

#include <netinet/tcp.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet6/tcp6_var.h>
#include <netinet6/raw_ip6.h>
#include <netinet6/udp6_var.h>
#include <netinet6/pim6_var.h>
#include <netinet6/nd6.h>

#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif

#ifdef SCTP
#include <netinet/in_pcb.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp.h>
#include <netinet/sctp_var.h>
#include <netinet6/sctp6_var.h>
#endif /* SCTP */

#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#endif /* IPSEC */

#include <netinet6/ip6protosw.h>

/*
 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
 */

extern	struct domain inet6domain;
static	struct pr_usrreqs nousrreqs;

#define PR_LISTEN	0
#define PR_ABRTACPTDIS	0

struct ip6protosw inet6sw[] = {
{
	.pr_type =		0,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_IPV6,
	.pr_init =		ip6_init,
	.pr_slowtimo =		frag6_slowtimo,
	.pr_drain =		frag6_drain,
	.pr_usrreqs =		&nousrreqs,
},
{
	.pr_type =		SOCK_DGRAM,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_UDP,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		udp6_input,
	.pr_ctlinput =		udp6_ctlinput,
	.pr_ctloutput =		ip6_ctloutput,
	.pr_usrreqs =		&udp6_usrreqs,
},
{
	.pr_type =		SOCK_STREAM,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_TCP,
	.pr_flags =		PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN,
	.pr_input =		tcp6_input,
	.pr_ctlinput =		tcp6_ctlinput,
	.pr_ctloutput =		tcp_ctloutput,
#ifndef INET	/* don't call initialization and timeout routines twice */
	.pr_init =		tcp_init,
	.pr_fasttimo =		tcp_fasttimo,
	.pr_slowtimo =		tcp_slowtimo,
#endif
	.pr_drain =		tcp_drain,
	.pr_usrreqs =		&tcp6_usrreqs,
},
#ifdef SCTP
{
	.pr_type =	SOCK_DGRAM,
	.pr_domain =	&inet6domain,
        .pr_protocol =	IPPROTO_SCTP,
        .pr_flags =	PR_WANTRCVD,
        .pr_input =	sctp6_input,
        .pr_ctlinput =  sctp6_ctlinput,
        .pr_ctloutput = sctp_ctloutput,
        .pr_drain =	sctp_drain,
        .pr_usrreqs =	&sctp6_usrreqs
},
{
	.pr_type =	SOCK_SEQPACKET,
	.pr_domain =	&inet6domain,
        .pr_protocol =	IPPROTO_SCTP,
        .pr_flags =	PR_WANTRCVD,
        .pr_input =	sctp6_input,
        .pr_ctlinput =  sctp6_ctlinput,
        .pr_ctloutput = sctp_ctloutput,
        .pr_drain =	sctp_drain,
        .pr_usrreqs =	&sctp6_usrreqs
},

{
	.pr_type =	SOCK_STREAM,
	.pr_domain =	&inet6domain,
        .pr_protocol =	IPPROTO_SCTP,
        .pr_flags =	PR_WANTRCVD,
        .pr_input =	sctp6_input,
        .pr_ctlinput =  sctp6_ctlinput,
        .pr_ctloutput = sctp_ctloutput,
        .pr_drain =	sctp_drain,
        .pr_usrreqs =	&sctp6_usrreqs
},
#endif /* SCTP */
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_RAW,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		rip6_input,
	.pr_output =		rip6_output,
	.pr_ctlinput =		rip6_ctlinput,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_usrreqs =		&rip6_usrreqs
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_ICMPV6,
	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_LASTHDR,
	.pr_input =		icmp6_input,
	.pr_output =		rip6_output,
	.pr_ctlinput =		rip6_ctlinput,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_init =		icmp6_init,
	.pr_fasttimo =		icmp6_fasttimo,
	.pr_usrreqs =		&rip6_usrreqs
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_DSTOPTS,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		dest6_input,
	.pr_usrreqs =		&nousrreqs
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_ROUTING,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		route6_input,
	.pr_usrreqs =		&nousrreqs
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_FRAGMENT,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		frag6_input,
	.pr_usrreqs =		&nousrreqs
},
#ifdef IPSEC
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_AH,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		ipsec6_common_input,
	.pr_usrreqs =		&nousrreqs,
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_ESP,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
        .pr_input =		ipsec6_common_input,
	.pr_ctlinput =		esp6_ctlinput,
	.pr_usrreqs =		&nousrreqs,
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_IPCOMP,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
        .pr_input =		ipsec6_common_input,
	.pr_usrreqs =		&nousrreqs,
},
#endif /* IPSEC */
#ifdef INET
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_IPV4,
	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_LASTHDR,
	.pr_input =		encap6_input,
	.pr_output =		rip6_output,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_init =		encap_init,
	.pr_usrreqs =		&rip6_usrreqs
},
#endif /* INET */
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_IPV6,
	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_LASTHDR,
	.pr_input =		encap6_input,
	.pr_output =		rip6_output,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_init =		encap_init,
	.pr_usrreqs =		&rip6_usrreqs
},
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_PIM,
	.pr_flags =		PR_ATOMIC|PR_ADDR|PR_LASTHDR,
	.pr_input =		encap6_input,
	.pr_output =		rip6_output,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_usrreqs =		&rip6_usrreqs
},
#ifdef DEV_CARP
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_protocol =		IPPROTO_CARP,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		carp6_input,
	.pr_output =		rip6_output,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_usrreqs =		&rip6_usrreqs
},
#endif /* DEV_CARP */
/* raw wildcard */
{
	.pr_type =		SOCK_RAW,
	.pr_domain =		&inet6domain,
	.pr_flags =		PR_ATOMIC|PR_ADDR,
	.pr_input =		rip6_input,
	.pr_output =		rip6_output,
	.pr_ctloutput =		rip6_ctloutput,
	.pr_usrreqs =		&rip6_usrreqs
},
};

extern int in6_inithead(void **, int);

struct domain inet6domain = {
	.dom_family =		AF_INET6,
	.dom_name =		"internet6",
	.dom_protosw =		(struct protosw *)inet6sw,
	.dom_protoswNPROTOSW =	(struct protosw *)
				&inet6sw[sizeof(inet6sw)/sizeof(inet6sw[0])],
#ifdef RADIX_MPATH
	.dom_rtattach =		rn6_mpath_inithead,
#else
	.dom_rtattach =		in6_inithead,
#endif
	.dom_rtoffset =		offsetof(struct sockaddr_in6, sin6_addr) << 3,
	.dom_maxrtkey =		sizeof(struct sockaddr_in6),
	.dom_ifattach =		in6_domifattach,
	.dom_ifdetach =		in6_domifdetach
};

DOMAIN_SET(inet6);

/*
 * Internet configuration info
 */
#ifndef	IPV6FORWARDING
#ifdef GATEWAY6
#define	IPV6FORWARDING	1	/* forward IP6 packets not for us */
#else
#define	IPV6FORWARDING	0	/* don't forward IP6 packets not for us */
#endif /* GATEWAY6 */
#endif /* !IPV6FORWARDING */

#ifndef	IPV6_SENDREDIRECTS
#define	IPV6_SENDREDIRECTS	1
#endif

int	ip6_forwarding = IPV6FORWARDING;	/* act as router? */
int	ip6_sendredirects = IPV6_SENDREDIRECTS;
int	ip6_defhlim = IPV6_DEFHLIM;
int	ip6_defmcasthlim = IPV6_DEFAULT_MULTICAST_HOPS;
int	ip6_accept_rtadv = 0;	/* "IPV6FORWARDING ? 0 : 1" is dangerous */
int	ip6_maxfragpackets;	/* initialized in frag6.c:frag6_init() */
int	ip6_maxfrags;	/* initialized in frag6.c:frag6_init() */
int	ip6_log_interval = 5;
int	ip6_hdrnestlimit = 15;	/* How many header options will we process? */
int	ip6_dad_count = 1;	/* DupAddrDetectionTransmits */
int	ip6_auto_flowlabel = 1;
int	ip6_gif_hlim = 0;
int	ip6_use_deprecated = 1;	/* allow deprecated addr (RFC2462 5.5.4) */
int	ip6_rr_prune = 5;	/* router renumbering prefix
				 * walk list every 5 sec. */
int	ip6_mcast_pmtu = 0;	/* enable pMTU discovery for multicast? */
int	ip6_v6only = 1;

int	ip6_keepfaith = 0;
time_t	ip6_log_time = (time_t)0L;
#ifdef IPSTEALTH
int	ip6stealth = 0;
#endif
int	nd6_onlink_ns_rfc4861 = 0; /* allow 'on-link' nd6 NS (as in RFC 4861) */

/* icmp6 */
/*
 * BSDI4 defines these variables in in_proto.c...
 * XXX: what if we don't define INET? Should we define pmtu6_expire
 * or so? (jinmei@kame.net 19990310)
 */
int pmtu_expire = 60*10;
int pmtu_probe = 60*2;

/* raw IP6 parameters */
/*
 * Nominal space allocated to a raw ip socket.
 */
#define	RIPV6SNDQ	8192
#define	RIPV6RCVQ	8192

u_long	rip6_sendspace = RIPV6SNDQ;
u_long	rip6_recvspace = RIPV6RCVQ;

/* ICMPV6 parameters */
int	icmp6_rediraccept = 1;		/* accept and process redirects */
int	icmp6_redirtimeout = 10 * 60;	/* 10 minutes */
int	icmp6errppslim = 100;		/* 100pps */
/* control how to respond to NI queries */
int	icmp6_nodeinfo = (ICMP6_NODEINFO_FQDNOK|ICMP6_NODEINFO_NODEADDROK);

/* UDP on IP6 parameters */
int	udp6_sendspace = 9216;		/* really max datagram size */
int	udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
					/* 40 1K datagrams */

/*
 * sysctl related items.
 */
SYSCTL_NODE(_net,	PF_INET6,	inet6,	CTLFLAG_RW,	0,
	"Internet6 Family");

/* net.inet6 */
SYSCTL_NODE(_net_inet6,	IPPROTO_IPV6,	ip6,	CTLFLAG_RW, 0,	"IP6");
SYSCTL_NODE(_net_inet6,	IPPROTO_ICMPV6,	icmp6,	CTLFLAG_RW, 0,	"ICMP6");
SYSCTL_NODE(_net_inet6,	IPPROTO_UDP,	udp6,	CTLFLAG_RW, 0,	"UDP6");
SYSCTL_NODE(_net_inet6,	IPPROTO_TCP,	tcp6,	CTLFLAG_RW, 0,	"TCP6");
#ifdef SCTP
SYSCTL_NODE(_net_inet6,	IPPROTO_SCTP,	sctp6,	CTLFLAG_RW, 0,	"SCTP6");
#endif
#ifdef IPSEC
SYSCTL_NODE(_net_inet6,	IPPROTO_ESP,	ipsec6,	CTLFLAG_RW, 0,	"IPSEC6");
#endif /* IPSEC */

/* net.inet6.ip6 */
static int
sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
{
	int error = 0;
	int old;

	error = SYSCTL_OUT(req, arg1, sizeof(int));
	if (error || !req->newptr)
		return (error);
	old = V_ip6_temp_preferred_lifetime;
	error = SYSCTL_IN(req, arg1, sizeof(int));
	if (V_ip6_temp_preferred_lifetime <
	    V_ip6_desync_factor + V_ip6_temp_regen_advance) {
		V_ip6_temp_preferred_lifetime = old;
		return (EINVAL);
	}
	return (error);
}

static int
sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
{
	int error = 0;
	int old;

	error = SYSCTL_OUT(req, arg1, sizeof(int));
	if (error || !req->newptr)
		return (error);
	old = V_ip6_temp_valid_lifetime;
	error = SYSCTL_IN(req, arg1, sizeof(int));
	if (V_ip6_temp_valid_lifetime < V_ip6_temp_preferred_lifetime) {
		V_ip6_temp_preferred_lifetime = old;
		return (EINVAL);
	}
	return (error);
}

SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING,
	forwarding, CTLFLAG_RW,		&ip6_forwarding,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS,
	redirect, CTLFLAG_RW,		&ip6_sendredirects,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM,
	hlim, CTLFLAG_RW,		&ip6_defhlim,	0, "");
SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_STATS, stats, CTLFLAG_RD,
	&ip6stat, ip6stat, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS,
	maxfragpackets, CTLFLAG_RW,	&ip6_maxfragpackets,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV,
	accept_rtadv, CTLFLAG_RW,	&ip6_accept_rtadv,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_KEEPFAITH,
	keepfaith, CTLFLAG_RW,		&ip6_keepfaith,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL,
	log_interval, CTLFLAG_RW,	&ip6_log_interval,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT,
	hdrnestlimit, CTLFLAG_RW,	&ip6_hdrnestlimit,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT,
	dad_count, CTLFLAG_RW,	&ip6_dad_count,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL,
	auto_flowlabel, CTLFLAG_RW,	&ip6_auto_flowlabel,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM,
	defmcasthlim, CTLFLAG_RW,	&ip6_defmcasthlim,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM,
	gifhlim, CTLFLAG_RW,	&ip6_gif_hlim,			0, "");
SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION,
	kame_version, CTLFLAG_RD,	__KAME_VERSION,		0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED,
	use_deprecated, CTLFLAG_RW,	&ip6_use_deprecated,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE,
	rr_prune, CTLFLAG_RW,	&ip6_rr_prune,			0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR,
	use_tempaddr, CTLFLAG_RW, &ip6_use_tempaddr,		0, "");
SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
	   CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_preferred_lifetime, 0,
	   sysctl_ip6_temppltime, "I", "");
SYSCTL_OID(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
	   CTLTYPE_INT|CTLFLAG_RW, &ip6_temp_valid_lifetime, 0,
	   sysctl_ip6_tempvltime, "I", "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY,
	v6only,	CTLFLAG_RW,	&ip6_v6only,			0, "");
TUNABLE_INT("net.inet6.ip6.auto_linklocal", &ip6_auto_linklocal);
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL,
	auto_linklocal, CTLFLAG_RW, &ip6_auto_linklocal,	0, "");
SYSCTL_STRUCT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats, CTLFLAG_RD,
	&rip6stat, rip6stat, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR,
	prefer_tempaddr, CTLFLAG_RW, &ip6_prefer_tempaddr,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE,
	use_defaultzone, CTLFLAG_RW, &ip6_use_defzone,		0,"");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MAXFRAGS,
	maxfrags, CTLFLAG_RW,		&ip6_maxfrags,	0, "");
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU,
	mcast_pmtu, CTLFLAG_RW,		&ip6_mcast_pmtu,	0, "");
#ifdef IPSTEALTH
SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_RW,
	&ip6stealth, 0, "");
#endif

/* net.inet6.icmp6 */
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT,
	rediraccept, CTLFLAG_RW,	&icmp6_rediraccept,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT,
	redirtimeout, CTLFLAG_RW,	&icmp6_redirtimeout,	0, "");
SYSCTL_STRUCT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats, CTLFLAG_RD,
	&icmp6stat, icmp6stat, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE,
	nd6_prune, CTLFLAG_RW,		&nd6_prune,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY,
	nd6_delay, CTLFLAG_RW,		&nd6_delay,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES,
	nd6_umaxtries, CTLFLAG_RW,	&nd6_umaxtries,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES,
	nd6_mmaxtries, CTLFLAG_RW,	&nd6_mmaxtries,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK,
	nd6_useloopback, CTLFLAG_RW,	&nd6_useloopback, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO,
	nodeinfo, CTLFLAG_RW,	&icmp6_nodeinfo,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT,
	errppslimit, CTLFLAG_RW,	&icmp6errppslim,	0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT,
	nd6_maxnudhint, CTLFLAG_RW,	&nd6_maxnudhint, 0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG,
	nd6_debug, CTLFLAG_RW,	&nd6_debug,		0, "");
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
	nd6_onlink_ns_rfc4861, CTLFLAG_RW, &nd6_onlink_ns_rfc4861, 0,
	"Accept 'on-link' nd6 NS in compliance with RFC 4861.");