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 __FBSDID("$FreeBSD$");
67
68 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_ipstealth.h"
72 #include "opt_sctp.h"
73 #include "opt_route.h"
74
75 #include <sys/param.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/proc.h>
79 #include <sys/protosw.h>
80 #include <sys/jail.h>
81 #include <sys/kernel.h>
82 #include <sys/malloc.h>
83 #include <sys/domain.h>
84 #include <sys/mbuf.h>
85 #include <sys/systm.h>
86 #include <sys/sysctl.h>
87
88 #include <net/if.h>
89 #include <net/if_var.h>
90 #include <netinet/in.h>
91 #include <netinet/ip6.h>
92 #include <netinet6/in6_var.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/nd6.h>
96 #include <netinet6/raw_ip6.h>
97
98 /* netinet6/raw_ip6.c */
99 extern struct protosw rip6_protosw;
100 /* netinet6/udp6_usrreq.c */
101 extern struct protosw udp6_protosw, udplite6_protosw;
102 /* netinet/tcp_usrreq.c */
103 extern struct protosw tcp6_protosw;
104 /* netinet/sctp6_usrreq.c */
105 extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw;
106
107 /*
108 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
109 */
110 FEATURE(inet6, "Internet Protocol version 6");
111
112 struct domain inet6domain = {
113 .dom_family = AF_INET6,
114 .dom_name = "internet6",
115 .dom_rtattach = in6_inithead,
116 #ifdef VIMAGE
117 .dom_rtdetach = in6_detachhead,
118 #endif
119 .dom_ifattach = in6_domifattach,
120 .dom_ifdetach = in6_domifdetach,
121 .dom_ifmtu = in6_domifmtu,
122 .dom_nprotosw = 14,
123 .dom_protosw = {
124 &tcp6_protosw,
125 &udp6_protosw,
126 #ifdef SCTP
127 &sctp6_seqpacket_protosw,
128 &sctp6_stream_protosw,
129 #else
130 NULL, NULL,
131 #endif
132 &udplite6_protosw,
133 &rip6_protosw,
134 /* Spacer 8 times for loadable protocols. XXXGL: why 8? */
135 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
136 },
137 };
138
139 DOMAIN_SET(inet6);
140
141 /*
142 * Internet configuration info
143 */
144 #ifndef IPV6FORWARDING
145 #ifdef GATEWAY6
146 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */
147 #else
148 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
149 #endif /* GATEWAY6 */
150 #endif /* !IPV6FORWARDING */
151
152 #ifndef IPV6_SENDREDIRECTS
153 #define IPV6_SENDREDIRECTS 1
154 #endif
155
156 VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */
157 VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS;
158 VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM;
159 VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
160 VNET_DEFINE(int, ip6_accept_rtadv) = 0;
161 VNET_DEFINE(int, ip6_no_radr) = 0;
162 VNET_DEFINE(int, ip6_norbit_raif) = 0;
163 VNET_DEFINE(int, ip6_rfc6204w3) = 0;
164 VNET_DEFINE(int, ip6_log_interval) = 5;
165 VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
166 * process? */
167 VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */
168 VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
169 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
170 * (RFC2462 5.5.4) */
171 VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix
172 * walk list every 5 sec. */
173 VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */
174 VNET_DEFINE(int, ip6_v6only) = 1;
175
176 VNET_DEFINE(time_t, ip6_log_time) = (time_t)0L;
177 #ifdef IPSTEALTH
178 VNET_DEFINE(int, ip6stealth) = 0;
179 #endif
180 VNET_DEFINE(int, nd6_onlink_ns_rfc4861) = 0;/* allow 'on-link' nd6 NS
181 * (RFC 4861) */
182
183 /* icmp6 */
184 /*
185 * BSDI4 defines these variables in in_proto.c...
186 * XXX: what if we don't define INET? Should we define pmtu6_expire
187 * or so? (jinmei@kame.net 19990310)
188 */
189 VNET_DEFINE(int, pmtu_expire) = 60*10;
190 VNET_DEFINE(int, pmtu_probe) = 60*2;
191
192 /* ICMPV6 parameters */
193 VNET_DEFINE(int, icmp6_rediraccept) = 1;/* accept and process redirects */
194 VNET_DEFINE(int, icmp6_redirtimeout) = 10 * 60; /* 10 minutes */
195 VNET_DEFINE(int, icmp6errppslim) = 100; /* 100pps */
196 /* control how to respond to NI queries */
197 VNET_DEFINE(int, icmp6_nodeinfo) =
198 (ICMP6_NODEINFO_FQDNOK|ICMP6_NODEINFO_NODEADDROK);
199 VNET_DEFINE(int, icmp6_nodeinfo_oldmcprefix) = 1;
200
201 /*
202 * sysctl related items.
203 */
204 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
205 "Internet6 Family");
206
207 /* net.inet6 */
208 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
209 "IP6");
210 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
211 "ICMP6");
212 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
213 "UDP6");
214 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
215 "TCP6");
216 #if defined(SCTP) || defined(SCTP_SUPPORT)
217 SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
218 "SCTP6");
219 #endif
220 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
221 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
222 "IPSEC6");
223 #endif /* IPSEC */
224
225 /* net.inet6.ip6 */
226 static int
227 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
228 {
229 int error, val;
230
231 val = V_ip6_temp_preferred_lifetime;
232 error = sysctl_handle_int(oidp, &val, 0, req);
233 if (error != 0 || !req->newptr)
234 return (error);
235 if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance)
236 return (EINVAL);
237 V_ip6_temp_preferred_lifetime = val;
238 return (0);
239 }
240
241 static int
242 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
243 {
244 int error, val;
245
246 val = V_ip6_temp_valid_lifetime;
247 error = sysctl_handle_int(oidp, &val, 0, req);
248 if (error != 0 || !req->newptr)
249 return (error);
250 if (val < V_ip6_temp_preferred_lifetime)
251 return (EINVAL);
252 V_ip6_temp_valid_lifetime = val;
253 return (0);
254 }
255
256 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
257 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
258 "Enable forwarding of IPv6 packets between interfaces");
259 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
260 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
261 "Send ICMPv6 redirects for unforwardable IPv6 packets");
262 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
263 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
264 "Default hop limit to use for outgoing IPv6 packets");
265 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
266 ip6stat,
267 "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
268 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
269 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_accept_rtadv), 0,
270 "Default value of per-interface flag for accepting ICMPv6 RA messages");
271 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
272 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_no_radr), 0,
273 "Default value of per-interface flag to control whether routers "
274 "sending ICMPv6 RA messages on that interface are added into the "
275 "default router list");
276 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
277 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
278 "Always set clear the R flag in ICMPv6 NA messages when accepting RA "
279 "on the interface");
280 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
281 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
282 "Accept the default router list from ICMPv6 RA messages even "
283 "when packet forwarding is enabled");
284 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
285 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
286 "Frequency in seconds at which to log IPv6 forwarding errors");
287 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
288 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
289 "Default maximum number of IPv6 extension headers permitted on "
290 "incoming IPv6 packets, 0 for no artificial limit");
291 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
292 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
293 "Number of ICMPv6 NS messages sent during duplicate address detection");
294 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
295 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
296 "Provide an IPv6 flowlabel in outbound packets");
297 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
298 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
299 "Default hop limit for IPv6 multicast packets originating from this "
300 "node");
301 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
302 CTLFLAG_RD, __KAME_VERSION, 0,
303 "KAME version string");
304 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
305 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
306 "Allow the use of addresses whose preferred lifetimes have expired");
307 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
308 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
309 ""); /* XXX unused */
310 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
311 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
312 "Create RFC3041 temporary addresses for autoconfigured addresses");
313 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
314 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
315 NULL, 0, sysctl_ip6_temppltime, "I",
316 "Maximum preferred lifetime for temporary addresses");
317 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
318 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
319 NULL, 0, sysctl_ip6_tempvltime, "I",
320 "Maximum valid lifetime for temporary addresses");
321 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
322 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
323 "Restrict AF_INET6 sockets to IPv6 addresses only");
324 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
325 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0,
326 "Default value of per-interface flag for automatically adding an IPv6 "
327 "link-local address to interfaces when attached");
328 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
329 struct rip6stat, rip6stat,
330 "Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
331 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
332 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
333 "Prefer RFC3041 temporary addresses in source address selection");
334 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
335 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
336 "Use the default scope zone when none is specified");
337 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
338 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
339 "Enable path MTU discovery for multicast packets");
340 #ifdef IPSTEALTH
341 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
342 &VNET_NAME(ip6stealth), 0,
343 "Forward IPv6 packets without decrementing their TTL");
344 #endif
345
346 /* net.inet6.icmp6 */
347 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
348 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0,
349 "Accept ICMPv6 redirect messages");
350 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
351 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0,
352 "Delay in seconds before expiring redirect route");
353 SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats,
354 struct icmp6stat, icmp6stat,
355 "ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)");
356 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune,
357 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0,
358 "Frequency in seconds of checks for expired prefixes and routers");
359 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay,
360 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0,
361 "Delay in seconds before probing for reachability");
362 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries,
363 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0,
364 "Number of ICMPv6 NS messages sent during reachability detection");
365 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries,
366 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0,
367 "Number of ICMPv6 NS messages sent during address resolution");
368 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback,
369 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0,
370 "Create a loopback route when configuring an IPv6 address");
371 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo,
372 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0,
373 "Mask of enabled RFC4620 node information query types");
374 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX,
375 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW,
376 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0,
377 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup "
378 "for compatibility with KAME implementation");
379 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit,
380 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0,
381 "Maximum number of ICMPv6 error messages per second");
382 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint,
383 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxnudhint), 0,
384 ""); /* XXX unused */
385 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug,
386 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0,
387 "Log NDP debug messages");
388 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
389 nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
390 &VNET_NAME(nd6_onlink_ns_rfc4861), 0,
391 "Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
392 #ifdef EXPERIMENTAL
393 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
394 nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW,
395 &VNET_NAME(nd6_ignore_ipv6_only_ra), 0,
396 "Ignore the 'IPv6-Only flag' in RA messages in compliance with "
397 "draft-ietf-6man-ipv6only-flag");
398 #endif
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