ip6_input.c revision 1.202 1 /* $NetBSD: ip6_input.c,v 1.202 2018/05/14 17:34:26 maxv Exp $ */
2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.202 2018/05/14 17:34:26 maxv Exp $");
66
67 #ifdef _KERNEL_OPT
68 #include "opt_gateway.h"
69 #include "opt_inet.h"
70 #include "opt_inet6.h"
71 #include "opt_ipsec.h"
72 #include "opt_net_mpsafe.h"
73 #endif
74
75 #include <sys/param.h>
76 #include <sys/systm.h>
77 #include <sys/mbuf.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/errno.h>
83 #include <sys/time.h>
84 #include <sys/kernel.h>
85 #include <sys/syslog.h>
86 #include <sys/proc.h>
87 #include <sys/sysctl.h>
88 #include <sys/cprng.h>
89 #include <sys/percpu.h>
90
91 #include <net/if.h>
92 #include <net/if_types.h>
93 #include <net/if_dl.h>
94 #include <net/route.h>
95 #include <net/pktqueue.h>
96 #include <net/pfil.h>
97
98 #include <netinet/in.h>
99 #include <netinet/in_systm.h>
100 #ifdef INET
101 #include <netinet/ip.h>
102 #include <netinet/ip_var.h>
103 #include <netinet/ip_icmp.h>
104 #endif /* INET */
105 #include <netinet/ip6.h>
106 #include <netinet/portalgo.h>
107 #include <netinet6/in6_var.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet6/ip6_private.h>
110 #include <netinet6/in6_pcb.h>
111 #include <netinet/icmp6.h>
112 #include <netinet6/scope6_var.h>
113 #include <netinet6/in6_ifattach.h>
114 #include <netinet6/nd6.h>
115
116 #ifdef IPSEC
117 #include <netipsec/ipsec.h>
118 #include <netipsec/ipsec6.h>
119 #include <netipsec/key.h>
120 #endif /* IPSEC */
121
122 #include <netinet6/ip6protosw.h>
123
124 #include "faith.h"
125
126 extern struct domain inet6domain;
127
128 u_char ip6_protox[IPPROTO_MAX];
129 pktqueue_t *ip6_pktq __read_mostly;
130
131 pfil_head_t *inet6_pfil_hook;
132
133 percpu_t *ip6stat_percpu;
134
135 percpu_t *ip6_forward_rt_percpu __cacheline_aligned;
136
137 static void ip6_init2(void);
138 static void ip6intr(void *);
139 static bool ip6_badaddr(struct ip6_hdr *);
140 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
141
142 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
143 u_int32_t *);
144 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
145 static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
146
147 #ifdef NET_MPSAFE
148 #define SOFTNET_LOCK() mutex_enter(softnet_lock)
149 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock)
150 #else
151 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
152 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
153 #endif
154
155 /*
156 * IP6 initialization: fill in IP6 protocol switch table.
157 * All protocols not implemented in kernel go to raw IP6 protocol handler.
158 */
159 void
160 ip6_init(void)
161 {
162 const struct ip6protosw *pr;
163 int i;
164
165 in6_init();
166
167 sysctl_net_inet6_ip6_setup(NULL);
168 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
169 if (pr == 0)
170 panic("ip6_init");
171 for (i = 0; i < IPPROTO_MAX; i++)
172 ip6_protox[i] = pr - inet6sw;
173 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
174 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
175 if (pr->pr_domain->dom_family == PF_INET6 &&
176 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
177 ip6_protox[pr->pr_protocol] = pr - inet6sw;
178
179 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL);
180 KASSERT(ip6_pktq != NULL);
181
182 scope6_init();
183 addrsel_policy_init();
184 nd6_init();
185 frag6_init();
186 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR;
187
188 ip6_init2();
189 #ifdef GATEWAY
190 ip6flow_init(ip6_hashsize);
191 #endif
192 /* Register our Packet Filter hook. */
193 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6);
194 KASSERT(inet6_pfil_hook != NULL);
195
196 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
197 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route));
198 }
199
200 static void
201 ip6_init2(void)
202 {
203
204 /* timer for regeneration of temporary addresses randomize ID */
205 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
206 callout_reset(&in6_tmpaddrtimer_ch,
207 (ip6_temp_preferred_lifetime - ip6_desync_factor -
208 ip6_temp_regen_advance) * hz,
209 in6_tmpaddrtimer, NULL);
210 }
211
212 /*
213 * IP6 input interrupt handling. Just pass the packet to ip6_input.
214 */
215 static void
216 ip6intr(void *arg __unused)
217 {
218 struct mbuf *m;
219
220 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
221 while ((m = pktq_dequeue(ip6_pktq)) != NULL) {
222 struct psref psref;
223 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref);
224
225 if (rcvif == NULL) {
226 m_freem(m);
227 continue;
228 }
229 /*
230 * Drop the packet if IPv6 is disabled on the interface.
231 */
232 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) {
233 m_put_rcvif_psref(rcvif, &psref);
234 m_freem(m);
235 continue;
236 }
237 ip6_input(m, rcvif);
238 m_put_rcvif_psref(rcvif, &psref);
239 }
240 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
241 }
242
243 void
244 ip6_input(struct mbuf *m, struct ifnet *rcvif)
245 {
246 struct ip6_hdr *ip6;
247 int hit, off = sizeof(struct ip6_hdr), nest;
248 u_int32_t plen;
249 u_int32_t rtalert = ~0;
250 int nxt, ours = 0, rh_present = 0, frg_present;
251 struct ifnet *deliverifp = NULL;
252 int srcrt = 0;
253 struct rtentry *rt = NULL;
254 union {
255 struct sockaddr dst;
256 struct sockaddr_in6 dst6;
257 } u;
258 struct route *ro;
259
260 KASSERT(rcvif != NULL);
261
262 /*
263 * make sure we don't have onion peering information into m_tag.
264 */
265 ip6_delaux(m);
266
267 /*
268 * mbuf statistics
269 */
270 if (m->m_flags & M_EXT) {
271 if (m->m_next)
272 IP6_STATINC(IP6_STAT_MEXT2M);
273 else
274 IP6_STATINC(IP6_STAT_MEXT1);
275 } else {
276 #define M2MMAX 32
277 if (m->m_next) {
278 if (m->m_flags & M_LOOP)
279 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
280 else if (rcvif->if_index < M2MMAX)
281 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index);
282 else
283 IP6_STATINC(IP6_STAT_M2M);
284 } else
285 IP6_STATINC(IP6_STAT_M1);
286 #undef M2MMAX
287 }
288
289 in6_ifstat_inc(rcvif, ifs6_in_receive);
290 IP6_STATINC(IP6_STAT_TOTAL);
291
292 /*
293 * If the IPv6 header is not aligned, slurp it up into a new
294 * mbuf with space for link headers, in the event we forward
295 * it. Otherwise, if it is aligned, make sure the entire base
296 * IPv6 header is in the first mbuf of the chain.
297 */
298 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
299 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
300 (max_linkhdr + 3) & ~3)) == NULL) {
301 /* XXXJRT new stat, please */
302 IP6_STATINC(IP6_STAT_TOOSMALL);
303 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
304 return;
305 }
306 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
307 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
308 IP6_STATINC(IP6_STAT_TOOSMALL);
309 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
310 return;
311 }
312 }
313
314 ip6 = mtod(m, struct ip6_hdr *);
315
316 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
317 IP6_STATINC(IP6_STAT_BADVERS);
318 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
319 goto bad;
320 }
321
322 if (ip6_badaddr(ip6)) {
323 IP6_STATINC(IP6_STAT_BADSCOPE);
324 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
325 goto bad;
326 }
327
328 /*
329 * Assume that we can create a fast-forward IP flow entry
330 * based on this packet.
331 */
332 m->m_flags |= M_CANFASTFWD;
333
334 /*
335 * Run through list of hooks for input packets. If there are any
336 * filters which require that additional packets in the flow are
337 * not fast-forwarded, they must clear the M_CANFASTFWD flag.
338 * Note that filters must _never_ set this flag, as another filter
339 * in the list may have previously cleared it.
340 *
341 * Don't call hooks if the packet has already been processed by
342 * IPsec (encapsulated, tunnel mode).
343 */
344 #if defined(IPSEC)
345 if (!ipsec_used || !ipsec_indone(m))
346 #else
347 if (1)
348 #endif
349 {
350 struct in6_addr odst;
351
352 odst = ip6->ip6_dst;
353 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0)
354 return;
355 if (m == NULL)
356 return;
357 ip6 = mtod(m, struct ip6_hdr *);
358 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
359 }
360
361 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
362
363 #ifdef ALTQ
364 if (altq_input != NULL) {
365 SOFTNET_LOCK();
366 if ((*altq_input)(m, AF_INET6) == 0) {
367 SOFTNET_UNLOCK();
368 /* packet is dropped by traffic conditioner */
369 return;
370 }
371 SOFTNET_UNLOCK();
372 }
373 #endif
374
375 /*
376 * Disambiguate address scope zones (if there is ambiguity).
377 * We first make sure that the original source or destination address
378 * is not in our internal form for scoped addresses. Such addresses
379 * are not necessarily invalid spec-wise, but we cannot accept them due
380 * to the usage conflict.
381 * in6_setscope() then also checks and rejects the cases where src or
382 * dst are the loopback address and the receiving interface
383 * is not loopback.
384 */
385 if (__predict_false(
386 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
387 goto bad;
388 ip6 = mtod(m, struct ip6_hdr *);
389 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
390 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
391 goto bad;
392 }
393 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
394 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
395 IP6_STATINC(IP6_STAT_BADSCOPE);
396 goto bad;
397 }
398
399 ro = percpu_getref(ip6_forward_rt_percpu);
400
401 /*
402 * Multicast check
403 */
404 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
405 bool ingroup;
406
407 in6_ifstat_inc(rcvif, ifs6_in_mcast);
408 /*
409 * See if we belong to the destination multicast group on the
410 * arrival interface.
411 */
412 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif);
413 if (ingroup) {
414 ours = 1;
415 } else if (!ip6_mrouter) {
416 uint64_t *ip6s = IP6_STAT_GETREF();
417 ip6s[IP6_STAT_NOTMEMBER]++;
418 ip6s[IP6_STAT_CANTFORWARD]++;
419 IP6_STAT_PUTREF();
420 in6_ifstat_inc(rcvif, ifs6_in_discard);
421 goto bad_unref;
422 }
423 deliverifp = rcvif;
424 goto hbhcheck;
425 }
426
427 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
428
429 /*
430 * Unicast check
431 */
432 rt = rtcache_lookup2(ro, &u.dst, 1, &hit);
433 if (hit)
434 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
435 else
436 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
437
438 /*
439 * Accept the packet if the forwarding interface to the destination
440 * (according to the routing table) is the loopback interface,
441 * unless the associated route has a gateway.
442 *
443 * We don't explicitly match ip6_dst against an interface here. It
444 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be
445 * IFT_LOOP if the packet is for us.
446 *
447 * Note that this approach causes to accept a packet if there is a
448 * route to the loopback interface for the destination of the packet.
449 * But we think it's even useful in some situations, e.g. when using
450 * a special daemon which wants to intercept the packet.
451 */
452 if (rt != NULL &&
453 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
454 rt->rt_ifp->if_type == IFT_LOOP) {
455 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
456 int addrok;
457
458 if (ia6->ia6_flags & IN6_IFF_ANYCAST)
459 m->m_flags |= M_ANYCAST6;
460 /*
461 * packets to a tentative, duplicated, or somehow invalid
462 * address must not be accepted.
463 */
464 if (ia6->ia6_flags & IN6_IFF_NOTREADY)
465 addrok = 0;
466 else if (ia6->ia6_flags & IN6_IFF_DETACHED &&
467 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src))
468 {
469 /* Allow internal traffic to DETACHED addresses */
470 struct sockaddr_in6 sin6;
471 int s;
472
473 memset(&sin6, 0, sizeof(sin6));
474 sin6.sin6_family = AF_INET6;
475 sin6.sin6_len = sizeof(sin6);
476 sin6.sin6_addr = ip6->ip6_src;
477 s = pserialize_read_enter();
478 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL);
479 pserialize_read_exit(s);
480 } else
481 addrok = 1;
482 if (addrok) {
483 /* this address is ready */
484 ours = 1;
485 deliverifp = ia6->ia_ifp; /* correct? */
486 goto hbhcheck;
487 } else {
488 /* address is not ready, so discard the packet. */
489 char ip6bufs[INET6_ADDRSTRLEN];
490 char ip6bufd[INET6_ADDRSTRLEN];
491 nd6log(LOG_INFO, "packet to an unready address %s->%s\n",
492 IN6_PRINT(ip6bufs, &ip6->ip6_src),
493 IN6_PRINT(ip6bufd, &ip6->ip6_dst));
494
495 goto bad_unref;
496 }
497 }
498
499 /*
500 * FAITH (Firewall Aided Internet Translator)
501 */
502 #if defined(NFAITH) && 0 < NFAITH
503 if (ip6_keepfaith) {
504 if (rt != NULL && rt->rt_ifp != NULL &&
505 rt->rt_ifp->if_type == IFT_FAITH) {
506 /* XXX do we need more sanity checks? */
507 ours = 1;
508 deliverifp = rt->rt_ifp; /* faith */
509 goto hbhcheck;
510 }
511 }
512 #endif
513
514 /*
515 * Now there is no reason to process the packet if it's not our own
516 * and we're not a router.
517 */
518 if (!ip6_forwarding) {
519 IP6_STATINC(IP6_STAT_CANTFORWARD);
520 in6_ifstat_inc(rcvif, ifs6_in_discard);
521 goto bad_unref;
522 }
523
524 hbhcheck:
525 /*
526 * Record address information into m_tag, if we don't have one yet.
527 * Note that we are unable to record it, if the address is not listed
528 * as our interface address (e.g. multicast addresses, addresses
529 * within FAITH prefixes and such).
530 */
531 if (deliverifp && ip6_getdstifaddr(m) == NULL) {
532 struct in6_ifaddr *ia6;
533 int s = pserialize_read_enter();
534
535 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
536 /* Depends on ip6_setdstifaddr never sleep */
537 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
538 /*
539 * XXX maybe we should drop the packet here,
540 * as we could not provide enough information
541 * to the upper layers.
542 */
543 }
544 pserialize_read_exit(s);
545 }
546
547 /*
548 * Process Hop-by-Hop options header if it's contained.
549 * m may be modified in ip6_hopopts_input().
550 * If a JumboPayload option is included, plen will also be modified.
551 */
552 plen = (u_int32_t)ntohs(ip6->ip6_plen);
553 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
554 struct ip6_hbh *hbh;
555
556 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
557 /* m already freed */
558 in6_ifstat_inc(rcvif, ifs6_in_discard);
559 rtcache_unref(rt, ro);
560 percpu_putref(ip6_forward_rt_percpu);
561 return;
562 }
563
564 /* adjust pointer */
565 ip6 = mtod(m, struct ip6_hdr *);
566
567 /*
568 * if the payload length field is 0 and the next header field
569 * indicates Hop-by-Hop Options header, then a Jumbo Payload
570 * option MUST be included.
571 */
572 if (ip6->ip6_plen == 0 && plen == 0) {
573 /*
574 * Note that if a valid jumbo payload option is
575 * contained, ip6_hopopts_input() must set a valid
576 * (non-zero) payload length to the variable plen.
577 */
578 IP6_STATINC(IP6_STAT_BADOPTIONS);
579 in6_ifstat_inc(rcvif, ifs6_in_discard);
580 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
581 icmp6_error(m, ICMP6_PARAM_PROB,
582 ICMP6_PARAMPROB_HEADER,
583 (char *)&ip6->ip6_plen - (char *)ip6);
584 rtcache_unref(rt, ro);
585 percpu_putref(ip6_forward_rt_percpu);
586 return;
587 }
588 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
589 sizeof(struct ip6_hbh));
590 if (hbh == NULL) {
591 IP6_STATINC(IP6_STAT_TOOSHORT);
592 rtcache_unref(rt, ro);
593 percpu_putref(ip6_forward_rt_percpu);
594 return;
595 }
596 KASSERT(IP6_HDR_ALIGNED_P(hbh));
597 nxt = hbh->ip6h_nxt;
598
599 /*
600 * accept the packet if a router alert option is included
601 * and we act as an IPv6 router.
602 */
603 if (rtalert != ~0 && ip6_forwarding)
604 ours = 1;
605 } else
606 nxt = ip6->ip6_nxt;
607
608 /*
609 * Check that the amount of data in the buffers is at least much as
610 * the IPv6 header would have us expect. Trim mbufs if longer than we
611 * expect. Drop packet if shorter than we expect.
612 */
613 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
614 IP6_STATINC(IP6_STAT_TOOSHORT);
615 in6_ifstat_inc(rcvif, ifs6_in_truncated);
616 goto bad_unref;
617 }
618 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
619 if (m->m_len == m->m_pkthdr.len) {
620 m->m_len = sizeof(struct ip6_hdr) + plen;
621 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
622 } else
623 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
624 }
625
626 /*
627 * Forward if desirable.
628 */
629 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
630 /*
631 * If we are acting as a multicast router, all
632 * incoming multicast packets are passed to the
633 * kernel-level multicast forwarding function.
634 * The packet is returned (relatively) intact; if
635 * ip6_mforward() returns a non-zero value, the packet
636 * must be discarded, else it may be accepted below.
637 */
638 if (ip6_mrouter != NULL) {
639 int error;
640
641 SOFTNET_LOCK();
642 error = ip6_mforward(ip6, rcvif, m);
643 SOFTNET_UNLOCK();
644
645 if (error != 0) {
646 rtcache_unref(rt, ro);
647 percpu_putref(ip6_forward_rt_percpu);
648 IP6_STATINC(IP6_STAT_CANTFORWARD);
649 goto bad;
650 }
651 }
652 if (!ours)
653 goto bad_unref;
654 } else if (!ours) {
655 rtcache_unref(rt, ro);
656 percpu_putref(ip6_forward_rt_percpu);
657 ip6_forward(m, srcrt);
658 return;
659 }
660
661 ip6 = mtod(m, struct ip6_hdr *);
662
663 /*
664 * Malicious party may be able to use IPv4 mapped addr to confuse
665 * tcp/udp stack and bypass security checks (act as if it was from
666 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
667 *
668 * For SIIT end node behavior, you may want to disable the check.
669 * However, you will become vulnerable to attacks using IPv4 mapped
670 * source.
671 */
672 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
673 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
674 IP6_STATINC(IP6_STAT_BADSCOPE);
675 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
676 goto bad_unref;
677 }
678
679 #ifdef IFA_STATS
680 if (deliverifp != NULL) {
681 struct in6_ifaddr *ia6;
682 int s = pserialize_read_enter();
683 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
684 if (ia6)
685 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
686 pserialize_read_exit(s);
687 }
688 #endif
689 IP6_STATINC(IP6_STAT_DELIVERED);
690 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
691 nest = 0;
692
693 if (rt != NULL) {
694 rtcache_unref(rt, ro);
695 rt = NULL;
696 }
697 percpu_putref(ip6_forward_rt_percpu);
698
699 rh_present = 0;
700 frg_present = 0;
701 while (nxt != IPPROTO_DONE) {
702 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
703 IP6_STATINC(IP6_STAT_TOOMANYHDR);
704 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
705 goto bad;
706 }
707
708 M_VERIFY_PACKET(m);
709
710 /*
711 * protection against faulty packet - there should be
712 * more sanity checks in header chain processing.
713 */
714 if (m->m_pkthdr.len < off) {
715 IP6_STATINC(IP6_STAT_TOOSHORT);
716 in6_ifstat_inc(rcvif, ifs6_in_truncated);
717 goto bad;
718 }
719
720 if (nxt == IPPROTO_ROUTING) {
721 if (rh_present++) {
722 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
723 IP6_STATINC(IP6_STAT_BADOPTIONS);
724 goto bad;
725 }
726 } else if (nxt == IPPROTO_FRAGMENT) {
727 if (frg_present++) {
728 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
729 IP6_STATINC(IP6_STAT_BADOPTIONS);
730 goto bad;
731 }
732 }
733
734 #ifdef IPSEC
735 if (ipsec_used) {
736 /*
737 * Enforce IPsec policy checking if we are seeing last
738 * header. Note that we do not visit this with
739 * protocols with pcb layer code - like udp/tcp/raw ip.
740 */
741 if ((inet6sw[ip_protox[nxt]].pr_flags
742 & PR_LASTHDR) != 0) {
743 int error;
744
745 error = ipsec_ip_input(m, false);
746 if (error)
747 goto bad;
748 }
749 }
750 #endif
751
752 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
753 }
754 return;
755
756 bad_unref:
757 rtcache_unref(rt, ro);
758 percpu_putref(ip6_forward_rt_percpu);
759 bad:
760 m_freem(m);
761 return;
762 }
763
764 static bool
765 ip6_badaddr(struct ip6_hdr *ip6)
766 {
767 /* Check against address spoofing/corruption. */
768 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
769 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
770 return true;
771 }
772
773 /*
774 * The following check is not documented in specs. A malicious
775 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
776 * and bypass security checks (act as if it was from 127.0.0.1 by using
777 * IPv6 src ::ffff:127.0.0.1). Be cautious.
778 *
779 * This check chokes if we are in an SIIT cloud. As none of BSDs
780 * support IPv4-less kernel compilation, we cannot support SIIT
781 * environment at all. So, it makes more sense for us to reject any
782 * malicious packets for non-SIIT environment, than try to do a
783 * partial support for SIIT environment.
784 */
785 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
786 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
787 return true;
788 }
789
790 /*
791 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291).
792 */
793 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
794 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
795 return true;
796 }
797
798 return false;
799 }
800
801 /*
802 * set/grab in6_ifaddr correspond to IPv6 destination address.
803 */
804 static struct m_tag *
805 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
806 {
807 struct m_tag *mtag;
808 struct ip6aux *ip6a;
809
810 mtag = ip6_addaux(m);
811 if (mtag == NULL)
812 return NULL;
813
814 ip6a = (struct ip6aux *)(mtag + 1);
815 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) {
816 IP6_STATINC(IP6_STAT_BADSCOPE);
817 return NULL;
818 }
819
820 ip6a->ip6a_src = ia->ia_addr.sin6_addr;
821 ip6a->ip6a_flags = ia->ia6_flags;
822 return mtag;
823 }
824
825 const struct ip6aux *
826 ip6_getdstifaddr(struct mbuf *m)
827 {
828 struct m_tag *mtag;
829
830 mtag = ip6_findaux(m);
831 if (mtag != NULL)
832 return (struct ip6aux *)(mtag + 1);
833 else
834 return NULL;
835 }
836
837 /*
838 * Hop-by-Hop options header processing. If a valid jumbo payload option is
839 * included, the real payload length will be stored in plenp.
840 *
841 * rtalertp - XXX: should be stored more smart way
842 */
843 int
844 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
845 struct mbuf **mp, int *offp)
846 {
847 struct mbuf *m = *mp;
848 int off = *offp, hbhlen;
849 struct ip6_hbh *hbh;
850
851 /* validation of the length of the header */
852 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
853 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
854 if (hbh == NULL) {
855 IP6_STATINC(IP6_STAT_TOOSHORT);
856 return -1;
857 }
858 hbhlen = (hbh->ip6h_len + 1) << 3;
859 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
860 hbhlen);
861 if (hbh == NULL) {
862 IP6_STATINC(IP6_STAT_TOOSHORT);
863 return -1;
864 }
865 KASSERT(IP6_HDR_ALIGNED_P(hbh));
866 off += hbhlen;
867 hbhlen -= sizeof(struct ip6_hbh);
868
869 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
870 hbhlen, rtalertp, plenp) < 0)
871 return -1;
872
873 *offp = off;
874 *mp = m;
875 return 0;
876 }
877
878 /*
879 * Search header for all Hop-by-hop options and process each option.
880 * This function is separate from ip6_hopopts_input() in order to
881 * handle a case where the sending node itself process its hop-by-hop
882 * options header. In such a case, the function is called from ip6_output().
883 *
884 * The function assumes that hbh header is located right after the IPv6 header
885 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
886 * opthead + hbhlen is located in continuous memory region.
887 */
888 static int
889 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
890 u_int32_t *rtalertp, u_int32_t *plenp)
891 {
892 struct ip6_hdr *ip6;
893 int optlen = 0;
894 u_int8_t *opt = opthead;
895 u_int16_t rtalert_val;
896 u_int32_t jumboplen;
897 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
898
899 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
900 switch (*opt) {
901 case IP6OPT_PAD1:
902 optlen = 1;
903 break;
904 case IP6OPT_PADN:
905 if (hbhlen < IP6OPT_MINLEN) {
906 IP6_STATINC(IP6_STAT_TOOSMALL);
907 goto bad;
908 }
909 optlen = *(opt + 1) + 2;
910 break;
911 case IP6OPT_RTALERT:
912 /* XXX may need check for alignment */
913 if (hbhlen < IP6OPT_RTALERT_LEN) {
914 IP6_STATINC(IP6_STAT_TOOSMALL);
915 goto bad;
916 }
917 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
918 /* XXX stat */
919 icmp6_error(m, ICMP6_PARAM_PROB,
920 ICMP6_PARAMPROB_HEADER,
921 erroff + opt + 1 - opthead);
922 return (-1);
923 }
924 optlen = IP6OPT_RTALERT_LEN;
925 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
926 *rtalertp = ntohs(rtalert_val);
927 break;
928 case IP6OPT_JUMBO:
929 /* XXX may need check for alignment */
930 if (hbhlen < IP6OPT_JUMBO_LEN) {
931 IP6_STATINC(IP6_STAT_TOOSMALL);
932 goto bad;
933 }
934 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
935 /* XXX stat */
936 icmp6_error(m, ICMP6_PARAM_PROB,
937 ICMP6_PARAMPROB_HEADER,
938 erroff + opt + 1 - opthead);
939 return (-1);
940 }
941 optlen = IP6OPT_JUMBO_LEN;
942
943 /*
944 * IPv6 packets that have non 0 payload length
945 * must not contain a jumbo payload option.
946 */
947 ip6 = mtod(m, struct ip6_hdr *);
948 if (ip6->ip6_plen) {
949 IP6_STATINC(IP6_STAT_BADOPTIONS);
950 icmp6_error(m, ICMP6_PARAM_PROB,
951 ICMP6_PARAMPROB_HEADER,
952 erroff + opt - opthead);
953 return (-1);
954 }
955
956 /*
957 * We may see jumbolen in unaligned location, so
958 * we'd need to perform memcpy().
959 */
960 memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
961 jumboplen = (u_int32_t)htonl(jumboplen);
962
963 #if 1
964 /*
965 * if there are multiple jumbo payload options,
966 * *plenp will be non-zero and the packet will be
967 * rejected.
968 * the behavior may need some debate in ipngwg -
969 * multiple options does not make sense, however,
970 * there's no explicit mention in specification.
971 */
972 if (*plenp != 0) {
973 IP6_STATINC(IP6_STAT_BADOPTIONS);
974 icmp6_error(m, ICMP6_PARAM_PROB,
975 ICMP6_PARAMPROB_HEADER,
976 erroff + opt + 2 - opthead);
977 return (-1);
978 }
979 #endif
980
981 /*
982 * jumbo payload length must be larger than 65535.
983 */
984 if (jumboplen <= IPV6_MAXPACKET) {
985 IP6_STATINC(IP6_STAT_BADOPTIONS);
986 icmp6_error(m, ICMP6_PARAM_PROB,
987 ICMP6_PARAMPROB_HEADER,
988 erroff + opt + 2 - opthead);
989 return (-1);
990 }
991 *plenp = jumboplen;
992
993 break;
994 default: /* unknown option */
995 if (hbhlen < IP6OPT_MINLEN) {
996 IP6_STATINC(IP6_STAT_TOOSMALL);
997 goto bad;
998 }
999 optlen = ip6_unknown_opt(opt, m,
1000 erroff + opt - opthead);
1001 if (optlen == -1)
1002 return (-1);
1003 optlen += 2;
1004 break;
1005 }
1006 }
1007
1008 return (0);
1009
1010 bad:
1011 m_freem(m);
1012 return (-1);
1013 }
1014
1015 /*
1016 * Unknown option processing.
1017 * The third argument `off' is the offset from the IPv6 header to the option,
1018 * which is necessary if the IPv6 header the and option header and IPv6 header
1019 * is not continuous in order to return an ICMPv6 error.
1020 */
1021 int
1022 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1023 {
1024 struct ip6_hdr *ip6;
1025
1026 switch (IP6OPT_TYPE(*optp)) {
1027 case IP6OPT_TYPE_SKIP: /* ignore the option */
1028 return ((int)*(optp + 1));
1029 case IP6OPT_TYPE_DISCARD: /* silently discard */
1030 m_freem(m);
1031 return (-1);
1032 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1033 IP6_STATINC(IP6_STAT_BADOPTIONS);
1034 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1035 return (-1);
1036 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1037 IP6_STATINC(IP6_STAT_BADOPTIONS);
1038 ip6 = mtod(m, struct ip6_hdr *);
1039 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1040 (m->m_flags & (M_BCAST|M_MCAST)))
1041 m_freem(m);
1042 else
1043 icmp6_error(m, ICMP6_PARAM_PROB,
1044 ICMP6_PARAMPROB_OPTION, off);
1045 return (-1);
1046 }
1047
1048 m_freem(m); /* XXX: NOTREACHED */
1049 return (-1);
1050 }
1051
1052 /*
1053 * Create the "control" list for this pcb.
1054 *
1055 * The routine will be called from upper layer handlers like tcp6_input().
1056 * Thus the routine assumes that the caller (tcp6_input) have already
1057 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1058 * very first mbuf on the mbuf chain.
1059 * We may want to add some infinite loop prevention or sanity checks for safety.
1060 * (This applies only when you are using KAME mbuf chain restriction, i.e.
1061 * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1062 */
1063 void
1064 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1065 struct ip6_hdr *ip6, struct mbuf *m)
1066 {
1067 struct socket *so = in6p->in6p_socket;
1068 #ifdef RFC2292
1069 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1070 #else
1071 #define IS2292(x, y) (y)
1072 #endif
1073
1074 if (SOOPT_TIMESTAMP(so->so_options))
1075 mp = sbsavetimestamp(so->so_options, mp);
1076
1077 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1078 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1079 return;
1080
1081 /* RFC 2292 sec. 5 */
1082 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1083 struct in6_pktinfo pi6;
1084
1085 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
1086 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1087 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index;
1088 *mp = sbcreatecontrol(&pi6, sizeof(pi6),
1089 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1090 if (*mp)
1091 mp = &(*mp)->m_next;
1092 }
1093
1094 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1095 int hlim = ip6->ip6_hlim & 0xff;
1096
1097 *mp = sbcreatecontrol(&hlim, sizeof(hlim),
1098 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1099 if (*mp)
1100 mp = &(*mp)->m_next;
1101 }
1102
1103 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1104 u_int32_t flowinfo;
1105 int tclass;
1106
1107 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1108 flowinfo >>= 20;
1109
1110 tclass = flowinfo & 0xff;
1111 *mp = sbcreatecontrol(&tclass, sizeof(tclass),
1112 IPV6_TCLASS, IPPROTO_IPV6);
1113
1114 if (*mp)
1115 mp = &(*mp)->m_next;
1116 }
1117
1118 /*
1119 * IPV6_HOPOPTS socket option. Recall that we required super-user
1120 * privilege for the option (see ip6_ctloutput), but it might be too
1121 * strict, since there might be some hop-by-hop options which can be
1122 * returned to normal user.
1123 * See also RFC3542 section 8 (or RFC2292 section 6).
1124 */
1125 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1126 /*
1127 * Check if a hop-by-hop options header is contatined in the
1128 * received packet, and if so, store the options as ancillary
1129 * data. Note that a hop-by-hop options header must be
1130 * just after the IPv6 header, which fact is assured through
1131 * the IPv6 input processing.
1132 */
1133 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1134 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1135 struct ip6_hbh *hbh;
1136 int hbhlen;
1137 struct mbuf *ext;
1138
1139 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1140 xip6->ip6_nxt);
1141 if (ext == NULL) {
1142 IP6_STATINC(IP6_STAT_TOOSHORT);
1143 return;
1144 }
1145 hbh = mtod(ext, struct ip6_hbh *);
1146 hbhlen = (hbh->ip6h_len + 1) << 3;
1147 if (hbhlen != ext->m_len) {
1148 m_freem(ext);
1149 IP6_STATINC(IP6_STAT_TOOSHORT);
1150 return;
1151 }
1152
1153 /*
1154 * XXX: We copy whole the header even if a jumbo
1155 * payload option is included, which option is to
1156 * be removed before returning in the RFC 2292.
1157 * Note: this constraint is removed in RFC3542.
1158 */
1159 *mp = sbcreatecontrol(hbh, hbhlen,
1160 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1161 IPPROTO_IPV6);
1162 if (*mp)
1163 mp = &(*mp)->m_next;
1164 m_freem(ext);
1165 }
1166 }
1167
1168 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1169 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1170 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1171 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1172
1173 /*
1174 * Search for destination options headers or routing
1175 * header(s) through the header chain, and stores each
1176 * header as ancillary data.
1177 * Note that the order of the headers remains in
1178 * the chain of ancillary data.
1179 */
1180 for (;;) { /* is explicit loop prevention necessary? */
1181 struct ip6_ext *ip6e = NULL;
1182 int elen;
1183 struct mbuf *ext = NULL;
1184
1185 /*
1186 * if it is not an extension header, don't try to
1187 * pull it from the chain.
1188 */
1189 switch (nxt) {
1190 case IPPROTO_DSTOPTS:
1191 case IPPROTO_ROUTING:
1192 case IPPROTO_HOPOPTS:
1193 case IPPROTO_AH: /* is it possible? */
1194 break;
1195 default:
1196 goto loopend;
1197 }
1198
1199 ext = ip6_pullexthdr(m, off, nxt);
1200 if (ext == NULL) {
1201 IP6_STATINC(IP6_STAT_TOOSHORT);
1202 return;
1203 }
1204 ip6e = mtod(ext, struct ip6_ext *);
1205 if (nxt == IPPROTO_AH)
1206 elen = (ip6e->ip6e_len + 2) << 2;
1207 else
1208 elen = (ip6e->ip6e_len + 1) << 3;
1209 if (elen != ext->m_len) {
1210 m_freem(ext);
1211 IP6_STATINC(IP6_STAT_TOOSHORT);
1212 return;
1213 }
1214 KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1215
1216 switch (nxt) {
1217 case IPPROTO_DSTOPTS:
1218 if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1219 break;
1220
1221 *mp = sbcreatecontrol(ip6e, elen,
1222 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1223 IPPROTO_IPV6);
1224 if (*mp)
1225 mp = &(*mp)->m_next;
1226 break;
1227
1228 case IPPROTO_ROUTING:
1229 if (!(in6p->in6p_flags & IN6P_RTHDR))
1230 break;
1231
1232 *mp = sbcreatecontrol(ip6e, elen,
1233 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1234 IPPROTO_IPV6);
1235 if (*mp)
1236 mp = &(*mp)->m_next;
1237 break;
1238
1239 case IPPROTO_HOPOPTS:
1240 case IPPROTO_AH: /* is it possible? */
1241 break;
1242
1243 default:
1244 /*
1245 * other cases have been filtered in the above.
1246 * none will visit this case. here we supply
1247 * the code just in case (nxt overwritten or
1248 * other cases).
1249 */
1250 m_freem(ext);
1251 goto loopend;
1252
1253 }
1254
1255 /* proceed with the next header. */
1256 off += elen;
1257 nxt = ip6e->ip6e_nxt;
1258 ip6e = NULL;
1259 m_freem(ext);
1260 ext = NULL;
1261 }
1262 loopend:
1263 ;
1264 }
1265 }
1266 #undef IS2292
1267
1268
1269 void
1270 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1271 uint32_t *mtu)
1272 {
1273 struct socket *so;
1274 struct mbuf *m_mtu;
1275 struct ip6_mtuinfo mtuctl;
1276
1277 so = in6p->in6p_socket;
1278
1279 if (mtu == NULL)
1280 return;
1281
1282 KASSERT(so != NULL);
1283
1284 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1285 mtuctl.ip6m_mtu = *mtu;
1286 mtuctl.ip6m_addr = *dst;
1287 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1288 return;
1289
1290 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl),
1291 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1292 return;
1293
1294 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1295 == 0) {
1296 soroverflow(so);
1297 m_freem(m_mtu);
1298 } else
1299 sorwakeup(so);
1300
1301 return;
1302 }
1303
1304 /*
1305 * pull single extension header from mbuf chain. returns single mbuf that
1306 * contains the result, or NULL on error.
1307 */
1308 static struct mbuf *
1309 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1310 {
1311 struct ip6_ext ip6e;
1312 size_t elen;
1313 struct mbuf *n;
1314
1315 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1316 if (nxt == IPPROTO_AH)
1317 elen = (ip6e.ip6e_len + 2) << 2;
1318 else
1319 elen = (ip6e.ip6e_len + 1) << 3;
1320
1321 MGET(n, M_DONTWAIT, MT_DATA);
1322 if (n && elen >= MLEN) {
1323 MCLGET(n, M_DONTWAIT);
1324 if ((n->m_flags & M_EXT) == 0) {
1325 m_free(n);
1326 n = NULL;
1327 }
1328 }
1329 if (!n)
1330 return NULL;
1331
1332 n->m_len = 0;
1333 if (elen >= M_TRAILINGSPACE(n)) {
1334 m_free(n);
1335 return NULL;
1336 }
1337
1338 m_copydata(m, off, elen, mtod(n, void *));
1339 n->m_len = elen;
1340 return n;
1341 }
1342
1343 /*
1344 * Get offset to the previous header followed by the header
1345 * currently processed.
1346 */
1347 int
1348 ip6_get_prevhdr(struct mbuf *m, int off)
1349 {
1350 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1351
1352 if (off == sizeof(struct ip6_hdr)) {
1353 return offsetof(struct ip6_hdr, ip6_nxt);
1354 } else if (off < sizeof(struct ip6_hdr)) {
1355 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1356 } else {
1357 int len, nlen, nxt;
1358 struct ip6_ext ip6e;
1359
1360 nxt = ip6->ip6_nxt;
1361 len = sizeof(struct ip6_hdr);
1362 nlen = 0;
1363 while (len < off) {
1364 m_copydata(m, len, sizeof(ip6e), &ip6e);
1365
1366 switch (nxt) {
1367 case IPPROTO_FRAGMENT:
1368 nlen = sizeof(struct ip6_frag);
1369 break;
1370 case IPPROTO_AH:
1371 nlen = (ip6e.ip6e_len + 2) << 2;
1372 break;
1373 default:
1374 nlen = (ip6e.ip6e_len + 1) << 3;
1375 break;
1376 }
1377 len += nlen;
1378 nxt = ip6e.ip6e_nxt;
1379 }
1380
1381 return (len - nlen);
1382 }
1383 }
1384
1385 /*
1386 * get next header offset. m will be retained.
1387 */
1388 int
1389 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1390 {
1391 struct ip6_hdr ip6;
1392 struct ip6_ext ip6e;
1393 struct ip6_frag fh;
1394
1395 /* just in case */
1396 if (m == NULL)
1397 panic("%s: m == NULL", __func__);
1398 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1399 return -1;
1400
1401 switch (proto) {
1402 case IPPROTO_IPV6:
1403 /* do not chase beyond intermediate IPv6 headers */
1404 if (off != 0)
1405 return -1;
1406 if (m->m_pkthdr.len < off + sizeof(ip6))
1407 return -1;
1408 m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1409 if (nxtp)
1410 *nxtp = ip6.ip6_nxt;
1411 off += sizeof(ip6);
1412 return off;
1413
1414 case IPPROTO_FRAGMENT:
1415 /*
1416 * terminate parsing if it is not the first fragment,
1417 * it does not make sense to parse through it.
1418 */
1419 if (m->m_pkthdr.len < off + sizeof(fh))
1420 return -1;
1421 m_copydata(m, off, sizeof(fh), (void *)&fh);
1422 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1423 return -1;
1424 if (nxtp)
1425 *nxtp = fh.ip6f_nxt;
1426 off += sizeof(struct ip6_frag);
1427 return off;
1428
1429 case IPPROTO_AH:
1430 if (m->m_pkthdr.len < off + sizeof(ip6e))
1431 return -1;
1432 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1433 if (nxtp)
1434 *nxtp = ip6e.ip6e_nxt;
1435 off += (ip6e.ip6e_len + 2) << 2;
1436 if (m->m_pkthdr.len < off)
1437 return -1;
1438 return off;
1439
1440 case IPPROTO_HOPOPTS:
1441 case IPPROTO_ROUTING:
1442 case IPPROTO_DSTOPTS:
1443 if (m->m_pkthdr.len < off + sizeof(ip6e))
1444 return -1;
1445 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1446 if (nxtp)
1447 *nxtp = ip6e.ip6e_nxt;
1448 off += (ip6e.ip6e_len + 1) << 3;
1449 if (m->m_pkthdr.len < off)
1450 return -1;
1451 return off;
1452
1453 case IPPROTO_NONE:
1454 case IPPROTO_ESP:
1455 case IPPROTO_IPCOMP:
1456 /* give up */
1457 return -1;
1458
1459 default:
1460 return -1;
1461 }
1462 }
1463
1464 /*
1465 * get offset for the last header in the chain. m will be kept untainted.
1466 */
1467 int
1468 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1469 {
1470 int newoff;
1471 int nxt;
1472
1473 if (!nxtp) {
1474 nxt = -1;
1475 nxtp = &nxt;
1476 }
1477 for (;;) {
1478 newoff = ip6_nexthdr(m, off, proto, nxtp);
1479 if (newoff < 0)
1480 return off;
1481 else if (newoff < off)
1482 return -1; /* invalid */
1483 else if (newoff == off)
1484 return newoff;
1485
1486 off = newoff;
1487 proto = *nxtp;
1488 }
1489 }
1490
1491 struct m_tag *
1492 ip6_addaux(struct mbuf *m)
1493 {
1494 struct m_tag *mtag;
1495
1496 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1497 if (!mtag) {
1498 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1499 M_NOWAIT);
1500 if (mtag) {
1501 m_tag_prepend(m, mtag);
1502 memset(mtag + 1, 0, sizeof(struct ip6aux));
1503 }
1504 }
1505 return mtag;
1506 }
1507
1508 struct m_tag *
1509 ip6_findaux(struct mbuf *m)
1510 {
1511 struct m_tag *mtag;
1512
1513 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1514 return mtag;
1515 }
1516
1517 void
1518 ip6_delaux(struct mbuf *m)
1519 {
1520 struct m_tag *mtag;
1521
1522 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1523 if (mtag)
1524 m_tag_delete(m, mtag);
1525 }
1526
1527 /*
1528 * System control for IP6
1529 */
1530
1531 const u_char inet6ctlerrmap[PRC_NCMDS] = {
1532 0, 0, 0, 0,
1533 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1534 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1535 EMSGSIZE, EHOSTUNREACH, 0, 0,
1536 0, 0, 0, 0,
1537 ENOPROTOOPT
1538 };
1539
1540 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS);
1541
1542 static int
1543 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1544 {
1545
1546 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1547 }
1548
1549 static void
1550 sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
1551 {
1552
1553 sysctl_createv(clog, 0, NULL, NULL,
1554 CTLFLAG_PERMANENT,
1555 CTLTYPE_NODE, "inet6",
1556 SYSCTL_DESCR("PF_INET6 related settings"),
1557 NULL, 0, NULL, 0,
1558 CTL_NET, PF_INET6, CTL_EOL);
1559 sysctl_createv(clog, 0, NULL, NULL,
1560 CTLFLAG_PERMANENT,
1561 CTLTYPE_NODE, "ip6",
1562 SYSCTL_DESCR("IPv6 related settings"),
1563 NULL, 0, NULL, 0,
1564 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1565
1566 sysctl_createv(clog, 0, NULL, NULL,
1567 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1568 CTLTYPE_INT, "forwarding",
1569 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1570 NULL, 0, &ip6_forwarding, 0,
1571 CTL_NET, PF_INET6, IPPROTO_IPV6,
1572 IPV6CTL_FORWARDING, CTL_EOL);
1573 sysctl_createv(clog, 0, NULL, NULL,
1574 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1575 CTLTYPE_INT, "redirect",
1576 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1577 NULL, 0, &ip6_sendredirects, 0,
1578 CTL_NET, PF_INET6, IPPROTO_IPV6,
1579 IPV6CTL_SENDREDIRECTS, CTL_EOL);
1580 sysctl_createv(clog, 0, NULL, NULL,
1581 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1582 CTLTYPE_INT, "hlim",
1583 SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1584 NULL, 0, &ip6_defhlim, 0,
1585 CTL_NET, PF_INET6, IPPROTO_IPV6,
1586 IPV6CTL_DEFHLIM, CTL_EOL);
1587 sysctl_createv(clog, 0, NULL, NULL,
1588 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1589 CTLTYPE_INT, "maxfragpackets",
1590 SYSCTL_DESCR("Maximum number of fragments to buffer "
1591 "for reassembly"),
1592 NULL, 0, &ip6_maxfragpackets, 0,
1593 CTL_NET, PF_INET6, IPPROTO_IPV6,
1594 IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1595 sysctl_createv(clog, 0, NULL, NULL,
1596 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1597 CTLTYPE_INT, "accept_rtadv",
1598 SYSCTL_DESCR("Accept router advertisements"),
1599 NULL, 0, &ip6_accept_rtadv, 0,
1600 CTL_NET, PF_INET6, IPPROTO_IPV6,
1601 IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1602 sysctl_createv(clog, 0, NULL, NULL,
1603 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1604 CTLTYPE_INT, "rtadv_maxroutes",
1605 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"),
1606 NULL, 0, &ip6_rtadv_maxroutes, 0,
1607 CTL_NET, PF_INET6, IPPROTO_IPV6,
1608 IPV6CTL_RTADV_MAXROUTES, CTL_EOL);
1609 sysctl_createv(clog, 0, NULL, NULL,
1610 CTLFLAG_PERMANENT,
1611 CTLTYPE_INT, "rtadv_numroutes",
1612 SYSCTL_DESCR("Current number of routes accepted via router advertisements"),
1613 NULL, 0, &nd6_numroutes, 0,
1614 CTL_NET, PF_INET6, IPPROTO_IPV6,
1615 IPV6CTL_RTADV_NUMROUTES, CTL_EOL);
1616 sysctl_createv(clog, 0, NULL, NULL,
1617 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1618 CTLTYPE_INT, "keepfaith",
1619 SYSCTL_DESCR("Activate faith interface"),
1620 NULL, 0, &ip6_keepfaith, 0,
1621 CTL_NET, PF_INET6, IPPROTO_IPV6,
1622 IPV6CTL_KEEPFAITH, CTL_EOL);
1623 sysctl_createv(clog, 0, NULL, NULL,
1624 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1625 CTLTYPE_INT, "log_interval",
1626 SYSCTL_DESCR("Minimum interval between logging "
1627 "unroutable packets"),
1628 NULL, 0, &ip6_log_interval, 0,
1629 CTL_NET, PF_INET6, IPPROTO_IPV6,
1630 IPV6CTL_LOG_INTERVAL, CTL_EOL);
1631 sysctl_createv(clog, 0, NULL, NULL,
1632 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1633 CTLTYPE_INT, "hdrnestlimit",
1634 SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1635 NULL, 0, &ip6_hdrnestlimit, 0,
1636 CTL_NET, PF_INET6, IPPROTO_IPV6,
1637 IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1638 sysctl_createv(clog, 0, NULL, NULL,
1639 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1640 CTLTYPE_INT, "dad_count",
1641 SYSCTL_DESCR("Number of Duplicate Address Detection "
1642 "probes to send"),
1643 NULL, 0, &ip6_dad_count, 0,
1644 CTL_NET, PF_INET6, IPPROTO_IPV6,
1645 IPV6CTL_DAD_COUNT, CTL_EOL);
1646 sysctl_createv(clog, 0, NULL, NULL,
1647 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1648 CTLTYPE_INT, "auto_flowlabel",
1649 SYSCTL_DESCR("Assign random IPv6 flow labels"),
1650 NULL, 0, &ip6_auto_flowlabel, 0,
1651 CTL_NET, PF_INET6, IPPROTO_IPV6,
1652 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1653 sysctl_createv(clog, 0, NULL, NULL,
1654 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1655 CTLTYPE_INT, "defmcasthlim",
1656 SYSCTL_DESCR("Default multicast hop limit"),
1657 NULL, 0, &ip6_defmcasthlim, 0,
1658 CTL_NET, PF_INET6, IPPROTO_IPV6,
1659 IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1660 sysctl_createv(clog, 0, NULL, NULL,
1661 CTLFLAG_PERMANENT,
1662 CTLTYPE_STRING, "kame_version",
1663 SYSCTL_DESCR("KAME Version"),
1664 NULL, 0, __UNCONST(__KAME_VERSION), 0,
1665 CTL_NET, PF_INET6, IPPROTO_IPV6,
1666 IPV6CTL_KAME_VERSION, CTL_EOL);
1667 sysctl_createv(clog, 0, NULL, NULL,
1668 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1669 CTLTYPE_INT, "use_deprecated",
1670 SYSCTL_DESCR("Allow use of deprecated addresses as "
1671 "source addresses"),
1672 NULL, 0, &ip6_use_deprecated, 0,
1673 CTL_NET, PF_INET6, IPPROTO_IPV6,
1674 IPV6CTL_USE_DEPRECATED, CTL_EOL);
1675 sysctl_createv(clog, 0, NULL, NULL,
1676 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1677 CTLTYPE_INT, "rr_prune", NULL,
1678 NULL, 0, &ip6_rr_prune, 0,
1679 CTL_NET, PF_INET6, IPPROTO_IPV6,
1680 IPV6CTL_RR_PRUNE, CTL_EOL);
1681 sysctl_createv(clog, 0, NULL, NULL,
1682 CTLFLAG_PERMANENT
1683 #ifndef INET6_BINDV6ONLY
1684 |CTLFLAG_READWRITE,
1685 #endif
1686 CTLTYPE_INT, "v6only",
1687 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1688 "to PF_INET sockets"),
1689 NULL, 0, &ip6_v6only, 0,
1690 CTL_NET, PF_INET6, IPPROTO_IPV6,
1691 IPV6CTL_V6ONLY, CTL_EOL);
1692 sysctl_createv(clog, 0, NULL, NULL,
1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1694 CTLTYPE_INT, "anonportmin",
1695 SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1696 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1697 CTL_NET, PF_INET6, IPPROTO_IPV6,
1698 IPV6CTL_ANONPORTMIN, CTL_EOL);
1699 sysctl_createv(clog, 0, NULL, NULL,
1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1701 CTLTYPE_INT, "anonportmax",
1702 SYSCTL_DESCR("Highest ephemeral port number to assign"),
1703 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1704 CTL_NET, PF_INET6, IPPROTO_IPV6,
1705 IPV6CTL_ANONPORTMAX, CTL_EOL);
1706 #ifndef IPNOPRIVPORTS
1707 sysctl_createv(clog, 0, NULL, NULL,
1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1709 CTLTYPE_INT, "lowportmin",
1710 SYSCTL_DESCR("Lowest privileged ephemeral port number "
1711 "to assign"),
1712 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1713 CTL_NET, PF_INET6, IPPROTO_IPV6,
1714 IPV6CTL_LOWPORTMIN, CTL_EOL);
1715 sysctl_createv(clog, 0, NULL, NULL,
1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1717 CTLTYPE_INT, "lowportmax",
1718 SYSCTL_DESCR("Highest privileged ephemeral port number "
1719 "to assign"),
1720 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1721 CTL_NET, PF_INET6, IPPROTO_IPV6,
1722 IPV6CTL_LOWPORTMAX, CTL_EOL);
1723 #endif /* IPNOPRIVPORTS */
1724 sysctl_createv(clog, 0, NULL, NULL,
1725 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1726 CTLTYPE_INT, "auto_linklocal",
1727 SYSCTL_DESCR("Default value of per-interface flag for "
1728 "adding an IPv6 link-local address to "
1729 "interfaces when attached"),
1730 NULL, 0, &ip6_auto_linklocal, 0,
1731 CTL_NET, PF_INET6, IPPROTO_IPV6,
1732 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL);
1733 sysctl_createv(clog, 0, NULL, NULL,
1734 CTLFLAG_PERMANENT|CTLFLAG_READONLY,
1735 CTLTYPE_STRUCT, "addctlpolicy",
1736 SYSCTL_DESCR("Return the current address control"
1737 " policy"),
1738 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0,
1739 CTL_NET, PF_INET6, IPPROTO_IPV6,
1740 IPV6CTL_ADDRCTLPOLICY, CTL_EOL);
1741 sysctl_createv(clog, 0, NULL, NULL,
1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1743 CTLTYPE_INT, "use_tempaddr",
1744 SYSCTL_DESCR("Use temporary address"),
1745 NULL, 0, &ip6_use_tempaddr, 0,
1746 CTL_NET, PF_INET6, IPPROTO_IPV6,
1747 CTL_CREATE, CTL_EOL);
1748 sysctl_createv(clog, 0, NULL, NULL,
1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1750 CTLTYPE_INT, "prefer_tempaddr",
1751 SYSCTL_DESCR("Prefer temporary address as source "
1752 "address"),
1753 NULL, 0, &ip6_prefer_tempaddr, 0,
1754 CTL_NET, PF_INET6, IPPROTO_IPV6,
1755 CTL_CREATE, CTL_EOL);
1756 sysctl_createv(clog, 0, NULL, NULL,
1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1758 CTLTYPE_INT, "temppltime",
1759 SYSCTL_DESCR("preferred lifetime of a temporary address"),
1760 NULL, 0, &ip6_temp_preferred_lifetime, 0,
1761 CTL_NET, PF_INET6, IPPROTO_IPV6,
1762 CTL_CREATE, CTL_EOL);
1763 sysctl_createv(clog, 0, NULL, NULL,
1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1765 CTLTYPE_INT, "tempvltime",
1766 SYSCTL_DESCR("valid lifetime of a temporary address"),
1767 NULL, 0, &ip6_temp_valid_lifetime, 0,
1768 CTL_NET, PF_INET6, IPPROTO_IPV6,
1769 CTL_CREATE, CTL_EOL);
1770 sysctl_createv(clog, 0, NULL, NULL,
1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1772 CTLTYPE_INT, "maxfrags",
1773 SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1774 NULL, 0, &ip6_maxfrags, 0,
1775 CTL_NET, PF_INET6, IPPROTO_IPV6,
1776 IPV6CTL_MAXFRAGS, CTL_EOL);
1777 sysctl_createv(clog, 0, NULL, NULL,
1778 CTLFLAG_PERMANENT,
1779 CTLTYPE_STRUCT, "stats",
1780 SYSCTL_DESCR("IPv6 statistics"),
1781 sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1782 CTL_NET, PF_INET6, IPPROTO_IPV6,
1783 IPV6CTL_STATS, CTL_EOL);
1784 sysctl_createv(clog, 0, NULL, NULL,
1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1786 CTLTYPE_INT, "use_defaultzone",
1787 SYSCTL_DESCR("Whether to use the default scope zones"),
1788 NULL, 0, &ip6_use_defzone, 0,
1789 CTL_NET, PF_INET6, IPPROTO_IPV6,
1790 IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1791 sysctl_createv(clog, 0, NULL, NULL,
1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1793 CTLTYPE_INT, "mcast_pmtu",
1794 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1795 NULL, 0, &ip6_mcast_pmtu, 0,
1796 CTL_NET, PF_INET6, IPPROTO_IPV6,
1797 CTL_CREATE, CTL_EOL);
1798 /* anonportalgo RFC6056 subtree */
1799 const struct sysctlnode *portalgo_node;
1800 sysctl_createv(clog, 0, NULL, &portalgo_node,
1801 CTLFLAG_PERMANENT,
1802 CTLTYPE_NODE, "anonportalgo",
1803 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"),
1804 NULL, 0, NULL, 0,
1805 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL);
1806 sysctl_createv(clog, 0, &portalgo_node, NULL,
1807 CTLFLAG_PERMANENT,
1808 CTLTYPE_STRING, "available",
1809 SYSCTL_DESCR("available algorithms"),
1810 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1811 CTL_CREATE, CTL_EOL);
1812 sysctl_createv(clog, 0, &portalgo_node, NULL,
1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1814 CTLTYPE_STRING, "selected",
1815 SYSCTL_DESCR("selected algorithm"),
1816 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN,
1817 CTL_CREATE, CTL_EOL);
1818 sysctl_createv(clog, 0, &portalgo_node, NULL,
1819 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1820 CTLTYPE_STRUCT, "reserve",
1821 SYSCTL_DESCR("bitmap of reserved ports"),
1822 sysctl_portalgo_reserve6, 0, NULL, 0,
1823 CTL_CREATE, CTL_EOL);
1824 sysctl_createv(clog, 0, NULL, NULL,
1825 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1826 CTLTYPE_INT, "neighborgcthresh",
1827 SYSCTL_DESCR("Maximum number of entries in neighbor"
1828 " cache"),
1829 NULL, 1, &ip6_neighborgcthresh, 0,
1830 CTL_NET, PF_INET6, IPPROTO_IPV6,
1831 CTL_CREATE, CTL_EOL);
1832 sysctl_createv(clog, 0, NULL, NULL,
1833 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1834 CTLTYPE_INT, "maxifprefixes",
1835 SYSCTL_DESCR("Maximum number of prefixes created by"
1836 " route advertisement per interface"),
1837 NULL, 1, &ip6_maxifprefixes, 0,
1838 CTL_NET, PF_INET6, IPPROTO_IPV6,
1839 CTL_CREATE, CTL_EOL);
1840 sysctl_createv(clog, 0, NULL, NULL,
1841 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1842 CTLTYPE_INT, "maxifdefrouters",
1843 SYSCTL_DESCR("Maximum number of default routers created"
1844 " by route advertisement per interface"),
1845 NULL, 1, &ip6_maxifdefrouters, 0,
1846 CTL_NET, PF_INET6, IPPROTO_IPV6,
1847 CTL_CREATE, CTL_EOL);
1848 sysctl_createv(clog, 0, NULL, NULL,
1849 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1850 CTLTYPE_INT, "maxdynroutes",
1851 SYSCTL_DESCR("Maximum number of routes created via"
1852 " redirect"),
1853 NULL, 1, &ip6_maxdynroutes, 0,
1854 CTL_NET, PF_INET6, IPPROTO_IPV6,
1855 CTL_CREATE, CTL_EOL);
1856 }
1857
1858 void
1859 ip6_statinc(u_int stat)
1860 {
1861
1862 KASSERT(stat < IP6_NSTATS);
1863 IP6_STATINC(stat);
1864 }
1865