xref: /freebsd/sys/netinet6/in6_proto.c (revision 5e3190f700637fcfc1a52daeaa4a031fdd2557c7)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the project nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	$KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $
32  */
33 
34 /*-
35  * Copyright (c) 1982, 1986, 1993
36  *	The Regents of the University of California.  All rights reserved.
37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  * 1. Redistributions of source code must retain the above copyright
42  *    notice, this list of conditions and the following disclaimer.
43  * 2. Redistributions in binary form must reproduce the above copyright
44  *    notice, this list of conditions and the following disclaimer in the
45  *    documentation and/or other materials provided with the distribution.
46  * 3. Neither the name of the University nor the names of its contributors
47  *    may be used to endorse or promote products derived from this software
48  *    without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60  * SUCH DAMAGE.
61  *
62  *	@(#)in_proto.c	8.1 (Berkeley) 6/10/93
63  */
64 
65 #include <sys/cdefs.h>
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipsec.h"
69 #include "opt_ipstealth.h"
70 #include "opt_sctp.h"
71 #include "opt_route.h"
72 
73 #include <sys/param.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/proc.h>
77 #include <sys/protosw.h>
78 #include <sys/jail.h>
79 #include <sys/kernel.h>
80 #include <sys/malloc.h>
81 #include <sys/domain.h>
82 #include <sys/mbuf.h>
83 #include <sys/systm.h>
84 #include <sys/sysctl.h>
85 
86 #include <net/if.h>
87 #include <net/if_var.h>
88 #include <netinet/in.h>
89 #include <netinet/ip6.h>
90 #include <netinet6/in6_var.h>
91 #include <netinet6/ip6_var.h>
92 #include <netinet/icmp6.h>
93 #include <netinet6/nd6.h>
94 #include <netinet6/raw_ip6.h>
95 
96 /* netinet6/raw_ip6.c */
97 extern struct protosw rip6_protosw;
98 /* netinet6/udp6_usrreq.c */
99 extern struct protosw udp6_protosw, udplite6_protosw;
100 /* netinet/tcp_usrreq.c */
101 extern struct protosw tcp6_protosw;
102 /* netinet/sctp6_usrreq.c */
103 extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw;
104 
105 /*
106  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
107  */
108 FEATURE(inet6, "Internet Protocol version 6");
109 
110 struct domain inet6domain = {
111 	.dom_family =		AF_INET6,
112 	.dom_name =		"internet6",
113 	.dom_rtattach =		in6_inithead,
114 #ifdef VIMAGE
115 	.dom_rtdetach =		in6_detachhead,
116 #endif
117 	.dom_ifattach =		in6_domifattach,
118 	.dom_ifdetach =		in6_domifdetach,
119 	.dom_ifmtu    =		in6_domifmtu,
120 	.dom_nprotosw =		14,
121 	.dom_protosw = {
122 		&tcp6_protosw,
123 		&udp6_protosw,
124 #ifdef SCTP
125 		&sctp6_seqpacket_protosw,
126 		&sctp6_stream_protosw,
127 #else
128 		NULL, NULL,
129 #endif
130 		&udplite6_protosw,
131 		&rip6_protosw,
132 		/* Spacer 8 times for loadable protocols. XXXGL: why 8? */
133 		NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
134 	},
135 };
136 
137 DOMAIN_SET(inet6);
138 
139 /*
140  * Internet configuration info
141  */
142 #ifndef	IPV6FORWARDING
143 #ifdef GATEWAY6
144 #define	IPV6FORWARDING	1	/* forward IP6 packets not for us */
145 #else
146 #define	IPV6FORWARDING	0	/* don't forward IP6 packets not for us */
147 #endif /* GATEWAY6 */
148 #endif /* !IPV6FORWARDING */
149 
150 #ifndef	IPV6_SENDREDIRECTS
151 #define	IPV6_SENDREDIRECTS	1
152 #endif
153 
154 VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING;	/* act as router? */
155 VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS;
156 VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM;
157 VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
158 VNET_DEFINE(int, ip6_accept_rtadv) = 0;
159 VNET_DEFINE(int, ip6_no_radr) = 0;
160 VNET_DEFINE(int, ip6_norbit_raif) = 0;
161 VNET_DEFINE(int, ip6_rfc6204w3) = 0;
162 VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
163 					 * process? */
164 VNET_DEFINE(int, ip6_dad_count) = 1;	/* DupAddrDetectionTransmits */
165 VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
166 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
167 					 * (RFC2462 5.5.4) */
168 VNET_DEFINE(int, ip6_rr_prune) = 5;	/* router renumbering prefix
169 					 * walk list every 5 sec. */
170 VNET_DEFINE(int, ip6_mcast_pmtu) = 0;	/* enable pMTU discovery for multicast? */
171 VNET_DEFINE(int, ip6_v6only) = 1;
172 
173 #ifdef IPSTEALTH
174 VNET_DEFINE(int, ip6stealth) = 0;
175 #endif
176 VNET_DEFINE(int, nd6_onlink_ns_rfc4861) = 0;/* allow 'on-link' nd6 NS
177 					     * (RFC 4861) */
178 VNET_DEFINE(bool, ip6_log_cannot_forward) = 1;
179 
180 /* icmp6 */
181 /*
182  * BSDI4 defines these variables in in_proto.c...
183  * XXX: what if we don't define INET? Should we define pmtu6_expire
184  * or so? (jinmei@kame.net 19990310)
185  */
186 VNET_DEFINE(int, pmtu_expire) = 60*10;
187 VNET_DEFINE(int, pmtu_probe) = 60*2;
188 
189 /* ICMPV6 parameters */
190 VNET_DEFINE(int, icmp6_rediraccept) = 1;/* accept and process redirects */
191 VNET_DEFINE(int, icmp6_redirtimeout) = 10 * 60;	/* 10 minutes */
192 VNET_DEFINE(int, icmp6errppslim) = 100;		/* 100pps */
193 /* control how to respond to NI queries */
194 VNET_DEFINE(int, icmp6_nodeinfo) = 0;
195 VNET_DEFINE(int, icmp6_nodeinfo_oldmcprefix) = 1;
196 
197 VNET_DEFINE_STATIC(int, ip6_log_interval) = 5;
198 VNET_DEFINE_STATIC(int, ip6_log_count) = 0;
199 VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 };
200 
201 #define	V_ip6_log_interval	VNET(ip6_log_interval)
202 #define	V_ip6_log_count		VNET(ip6_log_count)
203 #define	V_ip6_log_last		VNET(ip6_log_last)
204 
205 /*
206  * sysctl related items.
207  */
208 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
209     "Internet6 Family");
210 
211 /* net.inet6 */
212 SYSCTL_NODE(_net_inet6,	IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
213     "IP6");
214 SYSCTL_NODE(_net_inet6,	IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
215     "ICMP6");
216 SYSCTL_NODE(_net_inet6,	IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
217     "UDP6");
218 SYSCTL_NODE(_net_inet6,	IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
219     "TCP6");
220 #if defined(SCTP) || defined(SCTP_SUPPORT)
221 SYSCTL_NODE(_net_inet6,	IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
222     "SCTP6");
223 #endif
224 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
225 SYSCTL_NODE(_net_inet6,	IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
226     "IPSEC6");
227 #endif /* IPSEC */
228 
229 /* net.inet6.ip6 */
230 static int
231 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
232 {
233 	int error, val;
234 
235 	val = V_ip6_temp_preferred_lifetime;
236 	error = sysctl_handle_int(oidp, &val, 0, req);
237 	if (error != 0 || !req->newptr)
238 		return (error);
239 	if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance)
240 		return (EINVAL);
241 	V_ip6_temp_preferred_lifetime = val;
242 	return (0);
243 }
244 
245 static int
246 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
247 {
248 	int error, val;
249 
250 	val = V_ip6_temp_valid_lifetime;
251 	error = sysctl_handle_int(oidp, &val, 0, req);
252 	if (error != 0 || !req->newptr)
253 		return (error);
254 	if (val < V_ip6_temp_preferred_lifetime)
255 		return (EINVAL);
256 	V_ip6_temp_valid_lifetime = val;
257 	return (0);
258 }
259 
260 int
261 ip6_log_ratelimit(void)
262 {
263 
264 	return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count,
265 	    V_ip6_log_interval));
266 }
267 
268 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
269 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
270 	"Enable forwarding of IPv6 packets between interfaces");
271 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
272 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
273 	"Send ICMPv6 redirects for unforwardable IPv6 packets");
274 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
275 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
276 	"Default hop limit to use for outgoing IPv6 packets");
277 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
278 	ip6stat,
279 	"IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
280 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
281 	CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_accept_rtadv), 0,
282 	"Default value of per-interface flag for accepting ICMPv6 RA messages");
283 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
284 	CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_no_radr), 0,
285 	"Default value of per-interface flag to control whether routers "
286 	"sending ICMPv6 RA messages on that interface are added into the "
287 	"default router list");
288 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
289 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
290 	"Always set clear the R flag in ICMPv6 NA messages when accepting RA "
291 	"on the interface");
292 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
293 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
294 	"Accept the default router list from ICMPv6 RA messages even "
295 	"when packet forwarding is enabled");
296 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
297 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
298 	"Frequency in seconds at which to log IPv6 forwarding errors");
299 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
300 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
301 	"Default maximum number of IPv6 extension headers permitted on "
302 	"incoming IPv6 packets, 0 for no artificial limit");
303 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
304 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
305 	"Number of ICMPv6 NS messages sent during duplicate address detection");
306 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
307 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
308 	"Provide an IPv6 flowlabel in outbound packets");
309 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
310 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
311 	"Default hop limit for IPv6 multicast packets originating from this "
312 	"node");
313 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
314 	CTLFLAG_RD, __KAME_VERSION, 0,
315 	"KAME version string");
316 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
317 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
318 	"Allow the use of addresses whose preferred lifetimes have expired");
319 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
320 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
321 	""); /* XXX unused */
322 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
323 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
324 	"Create RFC3041 temporary addresses for autoconfigured addresses");
325 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
326 	CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
327 	NULL, 0, sysctl_ip6_temppltime, "I",
328 	"Maximum preferred lifetime for temporary addresses");
329 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
330 	CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
331 	NULL, 0, sysctl_ip6_tempvltime, "I",
332 	"Maximum valid lifetime for temporary addresses");
333 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
334 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
335 	"Restrict AF_INET6 sockets to IPv6 addresses only");
336 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
337 	CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_auto_linklocal), 0,
338 	"Default value of per-interface flag for automatically adding an IPv6 "
339 	"link-local address to interfaces when attached");
340 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
341 	struct rip6stat, rip6stat,
342 	"Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
343 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
344 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
345 	"Prefer RFC3041 temporary addresses in source address selection");
346 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
347 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
348 	"Use the default scope zone when none is specified");
349 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
350 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
351 	"Enable path MTU discovery for multicast packets");
352 #ifdef IPSTEALTH
353 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
354 	&VNET_NAME(ip6stealth), 0,
355 	"Forward IPv6 packets without decrementing their TTL");
356 #endif
357 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO,
358 	log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW,
359 	&VNET_NAME(ip6_log_cannot_forward), 1,
360 	"Log packets that cannot be forwarded");
361 
362 /* net.inet6.icmp6 */
363 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
364 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0,
365 	"Accept ICMPv6 redirect messages");
366 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
367 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0,
368 	"Delay in seconds before expiring redirect route");
369 SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats,
370 	struct icmp6stat, icmp6stat,
371 	"ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)");
372 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune,
373 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0,
374 	"Frequency in seconds of checks for expired prefixes and routers");
375 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay,
376 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0,
377 	"Delay in seconds before probing for reachability");
378 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries,
379 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0,
380 	"Number of ICMPv6 NS messages sent during reachability detection");
381 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries,
382 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0,
383 	"Number of ICMPv6 NS messages sent during address resolution");
384 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback,
385 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0,
386 	"Create a loopback route when configuring an IPv6 address");
387 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo,
388 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0,
389 	"Mask of enabled RFC4620 node information query types");
390 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX,
391 	nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW,
392 	&VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0,
393 	"Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup "
394 	"for compatibility with KAME implementation");
395 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit,
396 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0,
397 	"Maximum number of ICMPv6 error messages per second");
398 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint,
399 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxnudhint), 0,
400 	""); /* XXX unused */
401 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug,
402 	CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0,
403 	"Log NDP debug messages");
404 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
405 	nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
406 	&VNET_NAME(nd6_onlink_ns_rfc4861), 0,
407 	"Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
408 #ifdef EXPERIMENTAL
409 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
410 	nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW,
411 	&VNET_NAME(nd6_ignore_ipv6_only_ra), 0,
412 	"Ignore the 'IPv6-Only flag' in RA messages in compliance with "
413 	"draft-ietf-6man-ipv6only-flag");
414 #endif
415