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
63 #include <sys/cdefs.h>
64 #include "opt_inet.h"
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
67 #include "opt_ipstealth.h"
68 #include "opt_sctp.h"
69 #include "opt_route.h"
70
71 #include <sys/param.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/proc.h>
75 #include <sys/protosw.h>
76 #include <sys/jail.h>
77 #include <sys/kernel.h>
78 #include <sys/malloc.h>
79 #include <sys/domain.h>
80 #include <sys/mbuf.h>
81 #include <sys/systm.h>
82 #include <sys/sysctl.h>
83
84 #include <net/if.h>
85 #include <net/if_var.h>
86 #include <netinet/in.h>
87 #include <netinet/ip6.h>
88 #include <netinet6/in6_var.h>
89 #include <netinet6/ip6_var.h>
90 #include <netinet/icmp6.h>
91 #include <netinet6/nd6.h>
92 #include <netinet6/raw_ip6.h>
93
94 /* netinet6/raw_ip6.c */
95 extern struct protosw rip6_protosw;
96 /* netinet6/udp6_usrreq.c */
97 extern struct protosw udp6_protosw, udplite6_protosw;
98 /* netinet/tcp_usrreq.c */
99 extern struct protosw tcp6_protosw;
100 /* netinet/sctp6_usrreq.c */
101 extern struct protosw sctp6_seqpacket_protosw, sctp6_stream_protosw;
102
103 /*
104 * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
105 */
106 FEATURE(inet6, "Internet Protocol version 6");
107
108 struct domain inet6domain = {
109 .dom_family = AF_INET6,
110 .dom_name = "internet6",
111 .dom_rtattach = in6_inithead,
112 #ifdef VIMAGE
113 .dom_rtdetach = in6_detachhead,
114 #endif
115 .dom_ifattach = in6_domifattach,
116 .dom_ifdetach = in6_domifdetach,
117 .dom_ifmtu = in6_domifmtu,
118 .dom_nprotosw = 14,
119 .dom_protosw = {
120 &tcp6_protosw,
121 &udp6_protosw,
122 #ifdef SCTP
123 &sctp6_seqpacket_protosw,
124 &sctp6_stream_protosw,
125 #else
126 NULL, NULL,
127 #endif
128 &udplite6_protosw,
129 &rip6_protosw,
130 /* Spacer 8 times for loadable protocols. XXXGL: why 8? */
131 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
132 },
133 };
134
135 DOMAIN_SET(inet6);
136
137 /*
138 * Internet configuration info
139 */
140 #ifndef IPV6FORWARDING
141 #ifdef GATEWAY6
142 #define IPV6FORWARDING 1 /* forward IP6 packets not for us */
143 #else
144 #define IPV6FORWARDING 0 /* don't forward IP6 packets not for us */
145 #endif /* GATEWAY6 */
146 #endif /* !IPV6FORWARDING */
147
148 #ifndef IPV6_SENDREDIRECTS
149 #define IPV6_SENDREDIRECTS 1
150 #endif
151
152 VNET_DEFINE(int, ip6_forwarding) = IPV6FORWARDING; /* act as router? */
153 VNET_DEFINE(int, ip6_sendredirects) = IPV6_SENDREDIRECTS;
154 VNET_DEFINE(int, ip6_defhlim) = IPV6_DEFHLIM;
155 VNET_DEFINE(int, ip6_defmcasthlim) = IPV6_DEFAULT_MULTICAST_HOPS;
156 VNET_DEFINE(int, ip6_accept_rtadv) = 0;
157 VNET_DEFINE(int, ip6_no_radr) = 0;
158 VNET_DEFINE(int, ip6_norbit_raif) = 0;
159 VNET_DEFINE(int, ip6_rfc6204w3) = 0;
160 VNET_DEFINE(int, ip6_hdrnestlimit) = 15;/* How many header options will we
161 * process? */
162 VNET_DEFINE(int, ip6_dad_count) = 1; /* DupAddrDetectionTransmits */
163 VNET_DEFINE(int, ip6_auto_flowlabel) = 1;
164 VNET_DEFINE(int, ip6_use_deprecated) = 1;/* allow deprecated addr
165 * (RFC2462 5.5.4) */
166 VNET_DEFINE(int, ip6_rr_prune) = 5; /* router renumbering prefix
167 * walk list every 5 sec. */
168 VNET_DEFINE(int, ip6_mcast_pmtu) = 0; /* enable pMTU discovery for multicast? */
169 VNET_DEFINE(int, ip6_v6only) = 1;
170 VNET_DEFINE(u_int, ip6_stableaddr_maxretries) = IP6_IDGEN_RETRIES;
171
172 #ifdef IPSTEALTH
173 VNET_DEFINE(int, ip6stealth) = 0;
174 #endif
175 VNET_DEFINE(bool, ip6_log_cannot_forward) = 1;
176
177 /*
178 * BSDI4 defines these variables in in_proto.c...
179 * XXX: what if we don't define INET? Should we define pmtu6_expire
180 * or so? (jinmei@kame.net 19990310)
181 */
182 VNET_DEFINE(int, pmtu_expire) = 60*10;
183 VNET_DEFINE(int, pmtu_probe) = 60*2;
184
185 VNET_DEFINE_STATIC(int, ip6_log_interval) = 5;
186 VNET_DEFINE_STATIC(int, ip6_log_count) = 0;
187 VNET_DEFINE_STATIC(struct timeval, ip6_log_last) = { 0 };
188
189 #define V_ip6_log_interval VNET(ip6_log_interval)
190 #define V_ip6_log_count VNET(ip6_log_count)
191 #define V_ip6_log_last VNET(ip6_log_last)
192
193 /*
194 * sysctl related items.
195 */
196 SYSCTL_NODE(_net, PF_INET6, inet6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
197 "Internet6 Family");
198
199 /* net.inet6 */
200 SYSCTL_NODE(_net_inet6, IPPROTO_IPV6, ip6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
201 "IP6");
202 SYSCTL_NODE(_net_inet6, IPPROTO_ICMPV6, icmp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
203 "ICMP6");
204 SYSCTL_NODE(_net_inet6, IPPROTO_UDP, udp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
205 "UDP6");
206 SYSCTL_NODE(_net_inet6, IPPROTO_TCP, tcp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
207 "TCP6");
208 #if defined(SCTP) || defined(SCTP_SUPPORT)
209 SYSCTL_NODE(_net_inet6, IPPROTO_SCTP, sctp6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
210 "SCTP6");
211 #endif
212 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
213 SYSCTL_NODE(_net_inet6, IPPROTO_ESP, ipsec6, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
214 "IPSEC6");
215 #endif /* IPSEC */
216
217 /* net.inet6.ip6 */
218 static int
sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)219 sysctl_ip6_temppltime(SYSCTL_HANDLER_ARGS)
220 {
221 int error, val, ndf;
222
223 val = V_ip6_temp_preferred_lifetime;
224 error = sysctl_handle_int(oidp, &val, 0, req);
225 if (error != 0 || !req->newptr)
226 return (error);
227 ndf = TEMP_MAX_DESYNC_FACTOR_BASE + (val >> 2) + (val >> 3);
228 if (val < ndf + V_ip6_temp_regen_advance ||
229 val > V_ip6_temp_valid_lifetime)
230 return (EINVAL);
231 V_ip6_temp_preferred_lifetime = val;
232 V_ip6_temp_max_desync_factor = ndf;
233 V_ip6_desync_factor = arc4random() % ndf;
234 return (0);
235 }
236
237 static int
sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)238 sysctl_ip6_tempvltime(SYSCTL_HANDLER_ARGS)
239 {
240 int error, val;
241
242 val = V_ip6_temp_valid_lifetime;
243 error = sysctl_handle_int(oidp, &val, 0, req);
244 if (error != 0 || !req->newptr)
245 return (error);
246 if (val < V_ip6_temp_preferred_lifetime)
247 return (EINVAL);
248 V_ip6_temp_valid_lifetime = val;
249 return (0);
250 }
251
252 int
ip6_log_ratelimit(void)253 ip6_log_ratelimit(void)
254 {
255
256 return (ppsratecheck(&V_ip6_log_last, &V_ip6_log_count,
257 V_ip6_log_interval));
258 }
259
260 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_FORWARDING, forwarding,
261 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_forwarding), 0,
262 "Enable forwarding of IPv6 packets between interfaces");
263 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_SENDREDIRECTS, redirect,
264 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sendredirects), 0,
265 "Send ICMPv6 redirects for unforwardable IPv6 packets");
266 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFHLIM, hlim,
267 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defhlim), 0,
268 "Default hop limit to use for outgoing IPv6 packets");
269 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_STATS, stats, struct ip6stat,
270 ip6stat,
271 "IP6 statistics (struct ip6stat, netinet6/ip6_var.h)");
272 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_ACCEPT_RTADV, accept_rtadv,
273 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_accept_rtadv), 0,
274 "Default value of per-interface flag for accepting ICMPv6 RA messages");
275 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NO_RADR, no_radr,
276 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_no_radr), 0,
277 "Default value of per-interface flag to control whether routers "
278 "sending ICMPv6 RA messages on that interface are added into the "
279 "default router list");
280 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_NORBIT_RAIF, norbit_raif,
281 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_norbit_raif), 0,
282 "Always set clear the R flag in ICMPv6 NA messages when accepting RA "
283 "on the interface");
284 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RFC6204W3, rfc6204w3,
285 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rfc6204w3), 0,
286 "Accept the default router list from ICMPv6 RA messages even "
287 "when packet forwarding is enabled");
288 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_LOG_INTERVAL, log_interval,
289 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_log_interval), 0,
290 "Frequency in seconds at which to log IPv6 forwarding errors");
291 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_HDRNESTLIMIT, hdrnestlimit,
292 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_hdrnestlimit), 0,
293 "Default maximum number of IPv6 extension headers permitted on "
294 "incoming IPv6 packets, 0 for no artificial limit");
295 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DAD_COUNT, dad_count,
296 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_dad_count), 0,
297 "Number of ICMPv6 NS messages sent during duplicate address detection");
298 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_FLOWLABEL, auto_flowlabel,
299 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_auto_flowlabel), 0,
300 "Provide an IPv6 flowlabel in outbound packets");
301 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_DEFMCASTHLIM, defmcasthlim,
302 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_defmcasthlim), 0,
303 "Default hop limit for IPv6 multicast packets originating from this "
304 "node");
305 SYSCTL_STRING(_net_inet6_ip6, IPV6CTL_KAME_VERSION, kame_version,
306 CTLFLAG_RD, __KAME_VERSION, 0,
307 "KAME version string");
308 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEPRECATED, use_deprecated,
309 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_deprecated), 0,
310 "Allow the use of addresses whose preferred lifetimes have expired");
311 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_RR_PRUNE, rr_prune,
312 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_rr_prune), 0,
313 ""); /* XXX unused */
314 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USETEMPADDR, use_tempaddr,
315 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_tempaddr), 0,
316 "Create RFC3041 temporary addresses for autoconfigured addresses");
317 SYSCTL_BOOL(_net_inet6_ip6, IPV6CTL_USESTABLEADDR, use_stableaddr,
318 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_use_stableaddr), 0,
319 "Create RFC7217 semantically opaque address for autoconfigured addresses (default for new interfaces)");
320 SYSCTL_UINT(_net_inet6_ip6, IPV6CTL_STABLEADDR_MAXRETRIES, stableaddr_maxretries,
321 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_stableaddr_maxretries), IP6_IDGEN_RETRIES,
322 "RFC7217 semantically opaque address DAD max retries");
323 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STABLEADDR_NETIFSRC, stableaddr_netifsource,
324 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_stableaddr_netifsource), IP6_STABLEADDR_NETIFSRC_NAME,
325 "RFC7217 semantically opaque address Net_Iface source (0 - name, 1 - ID, 2 - MAC addr)");
326 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPPLTIME, temppltime,
327 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
328 NULL, 0, sysctl_ip6_temppltime, "I",
329 "Maximum preferred lifetime for temporary addresses");
330 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_TEMPVLTIME, tempvltime,
331 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
332 NULL, 0, sysctl_ip6_tempvltime, "I",
333 "Maximum valid lifetime for temporary addresses");
334 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_V6ONLY, v6only,
335 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_v6only), 0,
336 "Restrict AF_INET6 sockets to IPv6 addresses only");
337 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_AUTO_LINKLOCAL, auto_linklocal,
338 CTLFLAG_VNET | CTLFLAG_RWTUN, &VNET_NAME(ip6_auto_linklocal), 0,
339 "Default value of per-interface flag for automatically adding an IPv6 "
340 "link-local address to interfaces when attached");
341 SYSCTL_VNET_PCPUSTAT(_net_inet6_ip6, IPV6CTL_RIP6STATS, rip6stats,
342 struct rip6stat, rip6stat,
343 "Raw IP6 statistics (struct rip6stat, netinet6/raw_ip6.h)");
344 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_PREFER_TEMPADDR, prefer_tempaddr,
345 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_prefer_tempaddr), 0,
346 "Prefer RFC3041 temporary addresses in source address selection");
347 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_USE_DEFAULTZONE, use_defaultzone,
348 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_use_defzone), 0,
349 "Use the default scope zone when none is specified");
350 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_MCAST_PMTU, mcast_pmtu,
351 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_mcast_pmtu), 0,
352 "Enable path MTU discovery for multicast packets");
353 #ifdef IPSTEALTH
354 SYSCTL_INT(_net_inet6_ip6, IPV6CTL_STEALTH, stealth, CTLFLAG_VNET | CTLFLAG_RW,
355 &VNET_NAME(ip6stealth), 0,
356 "Forward IPv6 packets without decrementing their TTL");
357 #endif
358 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO,
359 log_cannot_forward, CTLFLAG_VNET | CTLFLAG_RW,
360 &VNET_NAME(ip6_log_cannot_forward), 1,
361 "Log packets that cannot be forwarded");
362