2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 * $KAME: in6_proto.c,v 1.91 2001/05/27 13:28:35 itojun Exp $
35 * Copyright (c) 1982, 1986, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
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.
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
62 * @(#)in_proto.c 8.1 (Berkeley) 6/10/93
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_ipstealth.h"
73 #include "opt_route.h"
75 #include <sys/param.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
79 #include <sys/protosw.h>
81 #include <sys/kernel.h>
82 #include <sys/malloc.h>
83 #include <sys/domain.h>
85 #include <sys/systm.h>
86 #include <sys/sysctl.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>
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;
108 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
110 FEATURE(inet6, "Internet Protocol version 6");
112 struct domain inet6domain = {
113 .dom_family = AF_INET6,
114 .dom_name = "internet6",
115 .dom_rtattach = in6_inithead,
117 .dom_rtdetach = in6_detachhead,
119 .dom_ifattach = in6_domifattach,
120 .dom_ifdetach = in6_domifdetach,
121 .dom_ifmtu = in6_domifmtu,
127 &sctp6_seqpacket_protosw,
128 &sctp6_stream_protosw,
134 /* Spacer 8 times for loadable protocols. XXXGL: why 8? */
135 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
142 * Internet configuration info
144 #ifndef IPV6FORWARDING
146 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */
148 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
149 #endif /* GATEWAY6 */
150 #endif /* !IPV6FORWARDING */
152 #ifndef IPV6_SENDREDIRECTS
153 #define IPV6_SENDREDIRECTS 1
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_hdrnestlimit) = 15;/* How many header options will we
166 VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */
167 VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
168 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
170 VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix
171 * walk list every 5 sec. */
172 VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */
173 VNET_DEFINE(int, ip6_v6only) = 1;
176 VNET_DEFINE(int, ip6stealth) = 0;
178 VNET_DEFINE(int, nd6_onlink_ns_rfc4861) = 0;/* allow 'on-link' nd6 NS
180 VNET_DEFINE(bool, ip6_log_cannot_forward) = 1;
184 * BSDI4 defines these variables in in_proto.c...
185 * XXX: what if we don't define INET? Should we define pmtu6_expire
186 * or so? (jinmei@kame.net 19990310)
188 VNET_DEFINE(int, pmtu_expire) = 60*10;
189 VNET_DEFINE(int, pmtu_probe) = 60*2;
191 /* ICMPV6 parameters */
192 VNET_DEFINE(int, icmp6_rediraccept) = 1;/* accept and process redirects */
193 VNET_DEFINE(int, icmp6_redirtimeout) = 10 * 60; /* 10 minutes */
194 VNET_DEFINE(int, icmp6errppslim) = 100; /* 100pps */
195 /* control how to respond to NI queries */
196 VNET_DEFINE(int, icmp6_nodeinfo) = 0;
197 VNET_DEFINE(int, icmp6_nodeinfo_oldmcprefix) = 1;
199 VNET_DEFINE_STATIC(int, ip6_log_interval) = 5;
200 VNET_DEFINE_STATIC(int, ip6_log_count) = 0;
201 VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 };
203 #define V_ip6_log_interval VNET(ip6_log_interval)
204 #define V_ip6_log_count VNET(ip6_log_count)
205 #define V_ip6_log_last VNET(ip6_log_last)
208 * sysctl related items.
210 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
214 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
216 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
218 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
220 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
222 #if defined(SCTP) || defined(SCTP_SUPPORT)
223 SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
226 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
227 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
233 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
237 val = V_ip6_temp_preferred_lifetime;
238 error = sysctl_handle_int(oidp, &val, 0, req);
239 if (error != 0 || !req->newptr)
241 if (val < V_ip6_desync_factor + V_ip6_temp_regen_advance)
243 V_ip6_temp_preferred_lifetime = val;
248 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
252 val = V_ip6_temp_valid_lifetime;
253 error = sysctl_handle_int(oidp, &val, 0, req);
254 if (error != 0 || !req->newptr)
256 if (val < V_ip6_temp_preferred_lifetime)
258 V_ip6_temp_valid_lifetime = val;
263 ip6_log_ratelimit(void)
266 return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count,
267 V_ip6_log_interval));
270 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
271 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
272 "Enable forwarding of IPv6 packets between interfaces");
273 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
274 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
275 "Send ICMPv6 redirects for unforwardable IPv6 packets");
276 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
277 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
278 "Default hop limit to use for outgoing IPv6 packets");
279 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
281 "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
282 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
283 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_accept_rtadv), 0,
284 "Default value of per-interface flag for accepting ICMPv6 RA messages");
285 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
286 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_no_radr), 0,
287 "Default value of per-interface flag to control whether routers "
288 "sending ICMPv6 RA messages on that interface are added into the "
289 "default router list");
290 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
291 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
292 "Always set clear the R flag in ICMPv6 NA messages when accepting RA "
294 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
295 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
296 "Accept the default router list from ICMPv6 RA messages even "
297 "when packet forwarding is enabled");
298 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
299 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
300 "Frequency in seconds at which to log IPv6 forwarding errors");
301 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
302 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
303 "Default maximum number of IPv6 extension headers permitted on "
304 "incoming IPv6 packets, 0 for no artificial limit");
305 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
306 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
307 "Number of ICMPv6 NS messages sent during duplicate address detection");
308 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
309 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
310 "Provide an IPv6 flowlabel in outbound packets");
311 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
312 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
313 "Default hop limit for IPv6 multicast packets originating from this "
315 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
316 CTLFLAG_RD, __KAME_VERSION, 0,
317 "KAME version string");
318 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
319 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
320 "Allow the use of addresses whose preferred lifetimes have expired");
321 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
322 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
323 ""); /* XXX unused */
324 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
325 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
326 "Create RFC3041 temporary addresses for autoconfigured addresses");
327 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
328 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
329 NULL, 0, sysctl_ip6_temppltime, "I",
330 "Maximum preferred lifetime for temporary addresses");
331 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
332 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
333 NULL, 0, sysctl_ip6_tempvltime, "I",
334 "Maximum valid lifetime for temporary addresses");
335 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
336 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
337 "Restrict AF_INET6 sockets to IPv6 addresses only");
338 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
339 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_linklocal), 0,
340 "Default value of per-interface flag for automatically adding an IPv6 "
341 "link-local address to interfaces when attached");
342 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
343 struct rip6stat, rip6stat,
344 "Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
345 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
346 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
347 "Prefer RFC3041 temporary addresses in source address selection");
348 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
349 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
350 "Use the default scope zone when none is specified");
351 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
352 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
353 "Enable path MTU discovery for multicast packets");
355 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
356 &VNET_NAME(ip6stealth), 0,
357 "Forward IPv6 packets without decrementing their TTL");
359 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO,
360 log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW,
361 &VNET_NAME(ip6_log_cannot_forward), 1,
362 "Log packets that cannot be forwarded");
364 /* net.inet6.icmp6 */
365 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
366 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0,
367 "Accept ICMPv6 redirect messages");
368 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
369 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0,
370 "Delay in seconds before expiring redirect route");
371 SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats,
372 struct icmp6stat, icmp6stat,
373 "ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)");
374 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune,
375 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0,
376 "Frequency in seconds of checks for expired prefixes and routers");
377 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay,
378 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0,
379 "Delay in seconds before probing for reachability");
380 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries,
381 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0,
382 "Number of ICMPv6 NS messages sent during reachability detection");
383 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries,
384 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0,
385 "Number of ICMPv6 NS messages sent during address resolution");
386 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback,
387 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0,
388 "Create a loopback route when configuring an IPv6 address");
389 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo,
390 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0,
391 "Mask of enabled RFC4620 node information query types");
392 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX,
393 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW,
394 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0,
395 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup "
396 "for compatibility with KAME implementation");
397 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit,
398 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0,
399 "Maximum number of ICMPv6 error messages per second");
400 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXNUDHINT, nd6_maxnudhint,
401 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxnudhint), 0,
402 ""); /* XXX unused */
403 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug,
404 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0,
405 "Log NDP debug messages");
406 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_ONLINKNSRFC4861,
407 nd6_onlink_ns_rfc4861, CTLFLAG_VNET | CTLFLAG_RW,
408 &VNET_NAME(nd6_onlink_ns_rfc4861), 0,
409 "Accept 'on-link' ICMPv6 NS messages in compliance with RFC 4861");
411 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO,
412 nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW,
413 &VNET_NAME(nd6_ignore_ipv6_only_ra), 0,
414 "Ignore the 'IPv6-Only flag' in RA messages in compliance with "
415 "draft-ietf-6man-ipv6only-flag");