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freebsd-skq/sys/netinet6/in6_proto.c
Hajimu UMEMOTO e7e51bc3e1 Make net.inet6.ip6.auto_linklocal tunable. Someone may want to 
enable/disable auto_linklocal even in single user mode.

Discussed with:	re@, gnn@
MFC after:	3 days
2006-10-13 12:45:53 +00:00

546 lines
17 KiB
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/* $FreeBSD$ */
/* $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $ */
/*-
* 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.
*/
/*-
* 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 "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_ipstealth.h"
#include "opt_carp.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 <net/if.h>
#include <net/radix.h>
#include <net/route.h>
#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 IPSEC
#include <netinet6/ipsec.h>
#ifdef INET6
#include <netinet6/ipsec6.h>
#endif
#include <netinet6/ah.h>
#ifdef INET6
#include <netinet6/ah6.h>
#endif
#ifdef IPSEC_ESP
#include <netinet6/esp.h>
#ifdef INET6
#include <netinet6/esp6.h>
#endif
#endif
#include <netinet6/ipcomp.h>
#ifdef INET6
#include <netinet6/ipcomp6.h>
#endif
#endif /* IPSEC */
#ifdef DEV_CARP
#include <netinet/ip_carp.h>
#endif
#ifdef FAST_IPSEC
#include <netipsec/ipsec6.h>
#define IPSEC
#define IPSEC_ESP
#define ah6_input ipsec6_common_input
#define esp6_input ipsec6_common_input
#define ipcomp6_input ipsec6_common_input
#endif /* FAST_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,
},
{
.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 = ah6_input,
.pr_usrreqs = &nousrreqs,
},
#ifdef IPSEC_ESP
{
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_ESP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = esp6_input,
.pr_ctlinput = esp6_ctlinput,
.pr_usrreqs = &nousrreqs,
},
#endif
{
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_IPCOMP,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_input = ipcomp6_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 = pim6_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 __P((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])],
.dom_rtattach = in6_inithead,
.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 = 50; /* appropriate? */
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
/* 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 */
int icmp6_nodeinfo = 3; /* enable/disable NI response */
/* 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 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 = ip6_temp_preferred_lifetime;
error = SYSCTL_IN(req, arg1, sizeof(int));
if (ip6_temp_preferred_lifetime <
ip6_desync_factor + ip6_temp_regen_advance) {
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 = ip6_temp_valid_lifetime;
error = SYSCTL_IN(req, arg1, sizeof(int));
if (ip6_temp_valid_lifetime < ip6_temp_preferred_lifetime) {
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, "");
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