1 /* $NetBSD: ip6_input.c,v 1.122.4.1 2009/05/03 13:22:22 bouyer 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 1.122.4.1 2009/05/03 13:22:22 bouyer Exp $");
66
67 #include "opt_inet.h"
68 #include "opt_inet6.h"
69 #include "opt_ipsec.h"
70 #include "opt_pfil_hooks.h"
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/malloc.h>
75 #include <sys/mbuf.h>
76 #include <sys/domain.h>
77 #include <sys/protosw.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
80 #include <sys/errno.h>
81 #include <sys/time.h>
82 #include <sys/kernel.h>
83 #include <sys/syslog.h>
84 #include <sys/proc.h>
85 #include <sys/sysctl.h>
86
87 #include <net/if.h>
88 #include <net/if_types.h>
89 #include <net/if_dl.h>
90 #include <net/route.h>
91 #include <net/netisr.h>
92 #ifdef PFIL_HOOKS
93 #include <net/pfil.h>
94 #endif
95
96 #include <netinet/in.h>
97 #include <netinet/in_systm.h>
98 #ifdef INET
99 #include <netinet/ip.h>
100 #include <netinet/ip_icmp.h>
101 #endif /* INET */
102 #include <netinet/ip6.h>
103 #include <netinet6/in6_var.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet6/ip6_private.h>
106 #include <netinet6/in6_pcb.h>
107 #include <netinet/icmp6.h>
108 #include <netinet6/scope6_var.h>
109 #include <netinet6/in6_ifattach.h>
110 #include <netinet6/nd6.h>
111
112 #ifdef IPSEC
113 #include <netinet6/ipsec.h>
114 #include <netinet6/ipsec_private.h>
115 #endif
116
117 #ifdef FAST_IPSEC
118 #include <netipsec/ipsec.h>
119 #include <netipsec/ipsec6.h>
120 #include <netipsec/key.h>
121 #endif /* FAST_IPSEC */
122
123 #include <netinet6/ip6protosw.h>
124
125 #include "faith.h"
126 #include "gif.h"
127
128 #if NGIF > 0
129 #include <netinet6/in6_gif.h>
130 #endif
131
132 #include <net/net_osdep.h>
133
134 extern struct domain inet6domain;
135
136 u_char ip6_protox[IPPROTO_MAX];
137 static int ip6qmaxlen = IFQ_MAXLEN;
138 struct in6_ifaddr *in6_ifaddr;
139 struct ifqueue ip6intrq;
140
141 extern callout_t in6_tmpaddrtimer_ch;
142
143 int ip6_forward_srcrt; /* XXX */
144 int ip6_sourcecheck; /* XXX */
145 int ip6_sourcecheck_interval; /* XXX */
146
147 #ifdef PFIL_HOOKS
148 struct pfil_head inet6_pfil_hook;
149 #endif
150
151 percpu_t *ip6stat_percpu;
152
153 static void ip6_init2(void *);
154 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
155
156 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
157 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
158
159 /*
160 * IP6 initialization: fill in IP6 protocol switch table.
161 * All protocols not implemented in kernel go to raw IP6 protocol handler.
162 */
163 void
164 ip6_init(void)
165 {
166 const struct ip6protosw *pr;
167 int i;
168
169 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
170 if (pr == 0)
171 panic("ip6_init");
172 for (i = 0; i < IPPROTO_MAX; i++)
173 ip6_protox[i] = pr - inet6sw;
174 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
175 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
176 if (pr->pr_domain->dom_family == PF_INET6 &&
177 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
178 ip6_protox[pr->pr_protocol] = pr - inet6sw;
179 ip6intrq.ifq_maxlen = ip6qmaxlen;
180 scope6_init();
181 addrsel_policy_init();
182 nd6_init();
183 frag6_init();
184 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
185
186 ip6_init2((void *)0);
187 #ifdef GATEWAY
188 ip6flow_init(ip6_hashsize);
189 #endif
190
191 #ifdef PFIL_HOOKS
192 /* Register our Packet Filter hook. */
193 inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
194 inet6_pfil_hook.ph_af = AF_INET6;
195 i = pfil_head_register(&inet6_pfil_hook);
196 if (i != 0)
197 printf("ip6_init: WARNING: unable to register pfil hook, "
198 "error %d\n", i);
199 #endif /* PFIL_HOOKS */
200
201 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
202 }
203
204 static void
205 ip6_init2(void *dummy)
206 {
207
208 /* nd6_timer_init */
209 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
210 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
211
212 /* timer for regeneranation of temporary addresses randomize ID */
213 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
214 callout_reset(&in6_tmpaddrtimer_ch,
215 (ip6_temp_preferred_lifetime - ip6_desync_factor -
216 ip6_temp_regen_advance) * hz,
217 in6_tmpaddrtimer, NULL);
218 }
219
220 /*
221 * IP6 input interrupt handling. Just pass the packet to ip6_input.
222 */
223 void
224 ip6intr(void)
225 {
226 int s;
227 struct mbuf *m;
228
229 mutex_enter(softnet_lock);
230 KERNEL_LOCK(1, NULL);
231 for (;;) {
232 s = splnet();
233 IF_DEQUEUE(&ip6intrq, m);
234 splx(s);
235 if (m == 0)
236 break;
237 /* drop the packet if IPv6 operation is disabled on the IF */
238 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
239 m_freem(m);
240 break;
241 }
242 ip6_input(m);
243 }
244 KERNEL_UNLOCK_ONE(NULL);
245 mutex_exit(softnet_lock);
246 }
247
248 extern struct route ip6_forward_rt;
249
250 void
251 ip6_input(struct mbuf *m)
252 {
253 struct ip6_hdr *ip6;
254 int hit, off = sizeof(struct ip6_hdr), nest;
255 u_int32_t plen;
256 u_int32_t rtalert = ~0;
257 int nxt, ours = 0, rh_present = 0;
258 struct ifnet *deliverifp = NULL;
259 int srcrt = 0;
260 const struct rtentry *rt;
261 union {
262 struct sockaddr dst;
263 struct sockaddr_in6 dst6;
264 } u;
265 #ifdef FAST_IPSEC
266 struct m_tag *mtag;
267 struct tdb_ident *tdbi;
268 struct secpolicy *sp;
269 int s, error;
270 #endif
271
272 #ifdef IPSEC
273 /*
274 * should the inner packet be considered authentic?
275 * see comment in ah4_input().
276 */
277 m->m_flags &= ~M_AUTHIPHDR;
278 m->m_flags &= ~M_AUTHIPDGM;
279 #endif
280
281 /*
282 * make sure we don't have onion peering information into m_tag.
283 */
284 ip6_delaux(m);
285
286 /*
287 * mbuf statistics
288 */
289 if (m->m_flags & M_EXT) {
290 if (m->m_next)
291 IP6_STATINC(IP6_STAT_MEXT2M);
292 else
293 IP6_STATINC(IP6_STAT_MEXT1);
294 } else {
295 #define M2MMAX 32
296 if (m->m_next) {
297 if (m->m_flags & M_LOOP) {
298 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
299 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
300 IP6_STATINC(IP6_STAT_M2M +
301 m->m_pkthdr.rcvif->if_index);
302 } else
303 IP6_STATINC(IP6_STAT_M2M);
304 } else
305 IP6_STATINC(IP6_STAT_M1);
306 #undef M2MMAX
307 }
308
309 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
310 IP6_STATINC(IP6_STAT_TOTAL);
311
312 /*
313 * If the IPv6 header is not aligned, slurp it up into a new
314 * mbuf with space for link headers, in the event we forward
315 * it. Otherwise, if it is aligned, make sure the entire base
316 * IPv6 header is in the first mbuf of the chain.
317 */
318 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
319 struct ifnet *inifp = m->m_pkthdr.rcvif;
320 if ((m = m_copyup(m, sizeof(struct ip6_hdr),
321 (max_linkhdr + 3) & ~3)) == NULL) {
322 /* XXXJRT new stat, please */
323 IP6_STATINC(IP6_STAT_TOOSMALL);
324 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
325 return;
326 }
327 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
328 struct ifnet *inifp = m->m_pkthdr.rcvif;
329 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
330 IP6_STATINC(IP6_STAT_TOOSMALL);
331 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
332 return;
333 }
334 }
335
336 ip6 = mtod(m, struct ip6_hdr *);
337
338 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
339 IP6_STATINC(IP6_STAT_BADVERS);
340 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
341 goto bad;
342 }
343
344 #if defined(IPSEC)
345 /* IPv6 fast forwarding is not compatible with IPsec. */
346 m->m_flags &= ~M_CANFASTFWD;
347 #else
348 /*
349 * Assume that we can create a fast-forward IP flow entry
350 * based on this packet.
351 */
352 m->m_flags |= M_CANFASTFWD;
353 #endif
354
355 #ifdef PFIL_HOOKS
356 /*
357 * Run through list of hooks for input packets. If there are any
358 * filters which require that additional packets in the flow are
359 * not fast-forwarded, they must clear the M_CANFASTFWD flag.
360 * Note that filters must _never_ set this flag, as another filter
361 * in the list may have previously cleared it.
362 */
363 /*
364 * let ipfilter look at packet on the wire,
365 * not the decapsulated packet.
366 */
367 #ifdef IPSEC
368 if (!ipsec_getnhist(m))
369 #elif defined(FAST_IPSEC)
370 if (!ipsec_indone(m))
371 #else
372 if (1)
373 #endif
374 {
375 struct in6_addr odst;
376
377 odst = ip6->ip6_dst;
378 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
379 PFIL_IN) != 0)
380 return;
381 if (m == NULL)
382 return;
383 ip6 = mtod(m, struct ip6_hdr *);
384 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
385 }
386 #endif /* PFIL_HOOKS */
387
388 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
389
390 #ifdef ALTQ
391 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
392 /* packet is dropped by traffic conditioner */
393 return;
394 }
395 #endif
396
397 /*
398 * Check against address spoofing/corruption.
399 */
400 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
401 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
402 /*
403 * XXX: "badscope" is not very suitable for a multicast source.
404 */
405 IP6_STATINC(IP6_STAT_BADSCOPE);
406 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
407 goto bad;
408 }
409 /*
410 * The following check is not documented in specs. A malicious
411 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
412 * and bypass security checks (act as if it was from 127.0.0.1 by using
413 * IPv6 src ::ffff:127.0.0.1). Be cautious.
414 *
415 * This check chokes if we are in an SIIT cloud. As none of BSDs
416 * support IPv4-less kernel compilation, we cannot support SIIT
417 * environment at all. So, it makes more sense for us to reject any
418 * malicious packets for non-SIIT environment, than try to do a
419 * partial support for SIIT environment.
420 */
421 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
422 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
423 IP6_STATINC(IP6_STAT_BADSCOPE);
424 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
425 goto bad;
426 }
427 #if 0
428 /*
429 * Reject packets with IPv4 compatible addresses (auto tunnel).
430 *
431 * The code forbids auto tunnel relay case in RFC1933 (the check is
432 * stronger than RFC1933). We may want to re-enable it if mech-xx
433 * is revised to forbid relaying case.
434 */
435 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
436 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
437 IP6_STATINC(IP6_STAT_BADSCOPE);
438 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
439 goto bad;
440 }
441 #endif
442
443 /*
444 * Disambiguate address scope zones (if there is ambiguity).
445 * We first make sure that the original source or destination address
446 * is not in our internal form for scoped addresses. Such addresses
447 * are not necessarily invalid spec-wise, but we cannot accept them due
448 * to the usage conflict.
449 * in6_setscope() then also checks and rejects the cases where src or
450 * dst are the loopback address and the receiving interface
451 * is not loopback.
452 */
453 if (__predict_false(
454 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
455 goto bad;
456 ip6 = mtod(m, struct ip6_hdr *);
457 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
458 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
459 goto bad;
460 }
461 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
462 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
463 IP6_STATINC(IP6_STAT_BADSCOPE);
464 goto bad;
465 }
466
467 /*
468 * Multicast check
469 */
470 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
471 struct in6_multi *in6m = 0;
472
473 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
474 /*
475 * See if we belong to the destination multicast group on the
476 * arrival interface.
477 */
478 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
479 if (in6m)
480 ours = 1;
481 else if (!ip6_mrouter) {
482 uint64_t *ip6s = IP6_STAT_GETREF();
483 ip6s[IP6_STAT_NOTMEMBER]++;
484 ip6s[IP6_STAT_CANTFORWARD]++;
485 IP6_STAT_PUTREF();
486 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
487 goto bad;
488 }
489 deliverifp = m->m_pkthdr.rcvif;
490 goto hbhcheck;
491 }
492
493 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
494
495 /*
496 * Unicast check
497 */
498 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
499 if (hit)
500 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
501 else
502 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
503
504 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
505
506 /*
507 * Accept the packet if the forwarding interface to the destination
508 * according to the routing table is the loopback interface,
509 * unless the associated route has a gateway.
510 * Note that this approach causes to accept a packet if there is a
511 * route to the loopback interface for the destination of the packet.
512 * But we think it's even useful in some situations, e.g. when using
513 * a special daemon which wants to intercept the packet.
514 */
515 if (rt != NULL &&
516 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
517 !(rt->rt_flags & RTF_CLONED) &&
518 #if 0
519 /*
520 * The check below is redundant since the comparison of
521 * the destination and the key of the rtentry has
522 * already done through looking up the routing table.
523 */
524 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
525 #endif
526 rt->rt_ifp->if_type == IFT_LOOP) {
527 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
528 if (ia6->ia6_flags & IN6_IFF_ANYCAST)
529 m->m_flags |= M_ANYCAST6;
530 /*
531 * packets to a tentative, duplicated, or somehow invalid
532 * address must not be accepted.
533 */
534 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
535 /* this address is ready */
536 ours = 1;
537 deliverifp = ia6->ia_ifp; /* correct? */
538 goto hbhcheck;
539 } else {
540 /* address is not ready, so discard the packet. */
541 nd6log((LOG_INFO,
542 "ip6_input: packet to an unready address %s->%s\n",
543 ip6_sprintf(&ip6->ip6_src),
544 ip6_sprintf(&ip6->ip6_dst)));
545
546 goto bad;
547 }
548 }
549
550 /*
551 * FAITH (Firewall Aided Internet Translator)
552 */
553 #if defined(NFAITH) && 0 < NFAITH
554 if (ip6_keepfaith) {
555 if (rt != NULL && rt->rt_ifp != NULL &&
556 rt->rt_ifp->if_type == IFT_FAITH) {
557 /* XXX do we need more sanity checks? */
558 ours = 1;
559 deliverifp = rt->rt_ifp; /* faith */
560 goto hbhcheck;
561 }
562 }
563 #endif
564
565 #if 0
566 {
567 /*
568 * Last resort: check in6_ifaddr for incoming interface.
569 * The code is here until I update the "goto ours hack" code above
570 * working right.
571 */
572 struct ifaddr *ifa;
573 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
574 if (ifa->ifa_addr == NULL)
575 continue; /* just for safety */
576 if (ifa->ifa_addr->sa_family != AF_INET6)
577 continue;
578 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
579 ours = 1;
580 deliverifp = ifa->ifa_ifp;
581 goto hbhcheck;
582 }
583 }
584 }
585 #endif
586
587 /*
588 * Now there is no reason to process the packet if it's not our own
589 * and we're not a router.
590 */
591 if (!ip6_forwarding) {
592 IP6_STATINC(IP6_STAT_CANTFORWARD);
593 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
594 goto bad;
595 }
596
597 hbhcheck:
598 /*
599 * record address information into m_tag, if we don't have one yet.
600 * note that we are unable to record it, if the address is not listed
601 * as our interface address (e.g. multicast addresses, addresses
602 * within FAITH prefixes and such).
603 */
604 if (deliverifp && ip6_getdstifaddr(m) == NULL) {
605 struct in6_ifaddr *ia6;
606
607 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
608 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
609 /*
610 * XXX maybe we should drop the packet here,
611 * as we could not provide enough information
612 * to the upper layers.
613 */
614 }
615 }
616
617 /*
618 * Process Hop-by-Hop options header if it's contained.
619 * m may be modified in ip6_hopopts_input().
620 * If a JumboPayload option is included, plen will also be modified.
621 */
622 plen = (u_int32_t)ntohs(ip6->ip6_plen);
623 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
624 struct ip6_hbh *hbh;
625
626 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
627 #if 0 /*touches NULL pointer*/
628 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
629 #endif
630 return; /* m have already been freed */
631 }
632
633 /* adjust pointer */
634 ip6 = mtod(m, struct ip6_hdr *);
635
636 /*
637 * if the payload length field is 0 and the next header field
638 * indicates Hop-by-Hop Options header, then a Jumbo Payload
639 * option MUST be included.
640 */
641 if (ip6->ip6_plen == 0 && plen == 0) {
642 /*
643 * Note that if a valid jumbo payload option is
644 * contained, ip6_hopopts_input() must set a valid
645 * (non-zero) payload length to the variable plen.
646 */
647 IP6_STATINC(IP6_STAT_BADOPTIONS);
648 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
649 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
650 icmp6_error(m, ICMP6_PARAM_PROB,
651 ICMP6_PARAMPROB_HEADER,
652 (char *)&ip6->ip6_plen - (char *)ip6);
653 return;
654 }
655 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
656 sizeof(struct ip6_hbh));
657 if (hbh == NULL) {
658 IP6_STATINC(IP6_STAT_TOOSHORT);
659 return;
660 }
661 KASSERT(IP6_HDR_ALIGNED_P(hbh));
662 nxt = hbh->ip6h_nxt;
663
664 /*
665 * accept the packet if a router alert option is included
666 * and we act as an IPv6 router.
667 */
668 if (rtalert != ~0 && ip6_forwarding)
669 ours = 1;
670 } else
671 nxt = ip6->ip6_nxt;
672
673 /*
674 * Check that the amount of data in the buffers
675 * is as at least much as the IPv6 header would have us expect.
676 * Trim mbufs if longer than we expect.
677 * Drop packet if shorter than we expect.
678 */
679 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
680 IP6_STATINC(IP6_STAT_TOOSHORT);
681 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
682 goto bad;
683 }
684 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
685 if (m->m_len == m->m_pkthdr.len) {
686 m->m_len = sizeof(struct ip6_hdr) + plen;
687 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
688 } else
689 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
690 }
691
692 /*
693 * Forward if desirable.
694 */
695 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
696 /*
697 * If we are acting as a multicast router, all
698 * incoming multicast packets are passed to the
699 * kernel-level multicast forwarding function.
700 * The packet is returned (relatively) intact; if
701 * ip6_mforward() returns a non-zero value, the packet
702 * must be discarded, else it may be accepted below.
703 */
704 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
705 IP6_STATINC(IP6_STAT_CANTFORWARD);
706 m_freem(m);
707 return;
708 }
709 if (!ours) {
710 m_freem(m);
711 return;
712 }
713 } else if (!ours) {
714 ip6_forward(m, srcrt);
715 return;
716 }
717
718 ip6 = mtod(m, struct ip6_hdr *);
719
720 /*
721 * Malicious party may be able to use IPv4 mapped addr to confuse
722 * tcp/udp stack and bypass security checks (act as if it was from
723 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
724 *
725 * For SIIT end node behavior, you may want to disable the check.
726 * However, you will become vulnerable to attacks using IPv4 mapped
727 * source.
728 */
729 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
730 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
731 IP6_STATINC(IP6_STAT_BADSCOPE);
732 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
733 goto bad;
734 }
735
736 /*
737 * Tell launch routine the next header
738 */
739 #ifdef IFA_STATS
740 if (deliverifp != NULL) {
741 struct in6_ifaddr *ia6;
742 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
743 if (ia6)
744 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
745 }
746 #endif
747 IP6_STATINC(IP6_STAT_DELIVERED);
748 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
749 nest = 0;
750
751 rh_present = 0;
752 while (nxt != IPPROTO_DONE) {
753 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
754 IP6_STATINC(IP6_STAT_TOOMANYHDR);
755 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
756 goto bad;
757 }
758
759 /*
760 * protection against faulty packet - there should be
761 * more sanity checks in header chain processing.
762 */
763 if (m->m_pkthdr.len < off) {
764 IP6_STATINC(IP6_STAT_TOOSHORT);
765 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
766 goto bad;
767 }
768
769 if (nxt == IPPROTO_ROUTING) {
770 if (rh_present++) {
771 in6_ifstat_inc(m->m_pkthdr.rcvif,
772 ifs6_in_hdrerr);
773 IP6_STATINC(IP6_STAT_BADOPTIONS);
774 goto bad;
775 }
776 }
777
778 #ifdef IPSEC
779 /*
780 * enforce IPsec policy checking if we are seeing last header.
781 * note that we do not visit this with protocols with pcb layer
782 * code - like udp/tcp/raw ip.
783 */
784 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
785 ipsec6_in_reject(m, NULL)) {
786 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
787 goto bad;
788 }
789 #endif
790 #ifdef FAST_IPSEC
791 /*
792 * enforce IPsec policy checking if we are seeing last header.
793 * note that we do not visit this with protocols with pcb layer
794 * code - like udp/tcp/raw ip.
795 */
796 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
797 /*
798 * Check if the packet has already had IPsec processing
799 * done. If so, then just pass it along. This tag gets
800 * set during AH, ESP, etc. input handling, before the
801 * packet is returned to the ip input queue for delivery.
802 */
803 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
804 s = splsoftnet();
805 if (mtag != NULL) {
806 tdbi = (struct tdb_ident *)(mtag + 1);
807 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
808 } else {
809 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
810 IP_FORWARDING, &error);
811 }
812 if (sp != NULL) {
813 /*
814 * Check security policy against packet attributes.
815 */
816 error = ipsec_in_reject(sp, m);
817 KEY_FREESP(&sp);
818 } else {
819 /* XXX error stat??? */
820 error = EINVAL;
821 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
822 }
823 splx(s);
824 if (error)
825 goto bad;
826 }
827 #endif /* FAST_IPSEC */
828
829
830 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
831 }
832 return;
833 bad:
834 m_freem(m);
835 }
836
837 /*
838 * set/grab in6_ifaddr correspond to IPv6 destination address.
839 */
840 static struct m_tag *
841 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
842 {
843 struct m_tag *mtag;
844
845 mtag = ip6_addaux(m);
846 if (mtag != NULL) {
847 struct ip6aux *ip6a;
848
849 ip6a = (struct ip6aux *)(mtag + 1);
850 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
851 ip6a->ip6a_src = ia->ia_addr.sin6_addr;
852 ip6a->ip6a_flags = ia->ia6_flags;
853 }
854 return mtag; /* NULL if failed to set */
855 }
856
857 const struct ip6aux *
858 ip6_getdstifaddr(struct mbuf *m)
859 {
860 struct m_tag *mtag;
861
862 mtag = ip6_findaux(m);
863 if (mtag != NULL)
864 return (struct ip6aux *)(mtag + 1);
865 else
866 return NULL;
867 }
868
869 /*
870 * Hop-by-Hop options header processing. If a valid jumbo payload option is
871 * included, the real payload length will be stored in plenp.
872 *
873 * rtalertp - XXX: should be stored more smart way
874 */
875 static int
876 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
877 struct mbuf **mp, int *offp)
878 {
879 struct mbuf *m = *mp;
880 int off = *offp, hbhlen;
881 struct ip6_hbh *hbh;
882
883 /* validation of the length of the header */
884 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
885 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
886 if (hbh == NULL) {
887 IP6_STATINC(IP6_STAT_TOOSHORT);
888 return -1;
889 }
890 hbhlen = (hbh->ip6h_len + 1) << 3;
891 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
892 hbhlen);
893 if (hbh == NULL) {
894 IP6_STATINC(IP6_STAT_TOOSHORT);
895 return -1;
896 }
897 KASSERT(IP6_HDR_ALIGNED_P(hbh));
898 off += hbhlen;
899 hbhlen -= sizeof(struct ip6_hbh);
900
901 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
902 hbhlen, rtalertp, plenp) < 0)
903 return (-1);
904
905 *offp = off;
906 *mp = m;
907 return (0);
908 }
909
910 /*
911 * Search header for all Hop-by-hop options and process each option.
912 * This function is separate from ip6_hopopts_input() in order to
913 * handle a case where the sending node itself process its hop-by-hop
914 * options header. In such a case, the function is called from ip6_output().
915 *
916 * The function assumes that hbh header is located right after the IPv6 header
917 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
918 * opthead + hbhlen is located in continuous memory region.
919 */
920 int
921 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
922 u_int32_t *rtalertp, u_int32_t *plenp)
923 {
924 struct ip6_hdr *ip6;
925 int optlen = 0;
926 u_int8_t *opt = opthead;
927 u_int16_t rtalert_val;
928 u_int32_t jumboplen;
929 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
930
931 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
932 switch (*opt) {
933 case IP6OPT_PAD1:
934 optlen = 1;
935 break;
936 case IP6OPT_PADN:
937 if (hbhlen < IP6OPT_MINLEN) {
938 IP6_STATINC(IP6_STAT_TOOSMALL);
939 goto bad;
940 }
941 optlen = *(opt + 1) + 2;
942 break;
943 case IP6OPT_RTALERT:
944 /* XXX may need check for alignment */
945 if (hbhlen < IP6OPT_RTALERT_LEN) {
946 IP6_STATINC(IP6_STAT_TOOSMALL);
947 goto bad;
948 }
949 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
950 /* XXX stat */
951 icmp6_error(m, ICMP6_PARAM_PROB,
952 ICMP6_PARAMPROB_HEADER,
953 erroff + opt + 1 - opthead);
954 return (-1);
955 }
956 optlen = IP6OPT_RTALERT_LEN;
957 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2);
958 *rtalertp = ntohs(rtalert_val);
959 break;
960 case IP6OPT_JUMBO:
961 /* XXX may need check for alignment */
962 if (hbhlen < IP6OPT_JUMBO_LEN) {
963 IP6_STATINC(IP6_STAT_TOOSMALL);
964 goto bad;
965 }
966 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
967 /* XXX stat */
968 icmp6_error(m, ICMP6_PARAM_PROB,
969 ICMP6_PARAMPROB_HEADER,
970 erroff + opt + 1 - opthead);
971 return (-1);
972 }
973 optlen = IP6OPT_JUMBO_LEN;
974
975 /*
976 * IPv6 packets that have non 0 payload length
977 * must not contain a jumbo payload option.
978 */
979 ip6 = mtod(m, struct ip6_hdr *);
980 if (ip6->ip6_plen) {
981 IP6_STATINC(IP6_STAT_BADOPTIONS);
982 icmp6_error(m, ICMP6_PARAM_PROB,
983 ICMP6_PARAMPROB_HEADER,
984 erroff + opt - opthead);
985 return (-1);
986 }
987
988 /*
989 * We may see jumbolen in unaligned location, so
990 * we'd need to perform bcopy().
991 */
992 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
993 jumboplen = (u_int32_t)htonl(jumboplen);
994
995 #if 1
996 /*
997 * if there are multiple jumbo payload options,
998 * *plenp will be non-zero and the packet will be
999 * rejected.
1000 * the behavior may need some debate in ipngwg -
1001 * multiple options does not make sense, however,
1002 * there's no explicit mention in specification.
1003 */
1004 if (*plenp != 0) {
1005 IP6_STATINC(IP6_STAT_BADOPTIONS);
1006 icmp6_error(m, ICMP6_PARAM_PROB,
1007 ICMP6_PARAMPROB_HEADER,
1008 erroff + opt + 2 - opthead);
1009 return (-1);
1010 }
1011 #endif
1012
1013 /*
1014 * jumbo payload length must be larger than 65535.
1015 */
1016 if (jumboplen <= IPV6_MAXPACKET) {
1017 IP6_STATINC(IP6_STAT_BADOPTIONS);
1018 icmp6_error(m, ICMP6_PARAM_PROB,
1019 ICMP6_PARAMPROB_HEADER,
1020 erroff + opt + 2 - opthead);
1021 return (-1);
1022 }
1023 *plenp = jumboplen;
1024
1025 break;
1026 default: /* unknown option */
1027 if (hbhlen < IP6OPT_MINLEN) {
1028 IP6_STATINC(IP6_STAT_TOOSMALL);
1029 goto bad;
1030 }
1031 optlen = ip6_unknown_opt(opt, m,
1032 erroff + opt - opthead);
1033 if (optlen == -1)
1034 return (-1);
1035 optlen += 2;
1036 break;
1037 }
1038 }
1039
1040 return (0);
1041
1042 bad:
1043 m_freem(m);
1044 return (-1);
1045 }
1046
1047 /*
1048 * Unknown option processing.
1049 * The third argument `off' is the offset from the IPv6 header to the option,
1050 * which is necessary if the IPv6 header the and option header and IPv6 header
1051 * is not continuous in order to return an ICMPv6 error.
1052 */
1053 int
1054 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1055 {
1056 struct ip6_hdr *ip6;
1057
1058 switch (IP6OPT_TYPE(*optp)) {
1059 case IP6OPT_TYPE_SKIP: /* ignore the option */
1060 return ((int)*(optp + 1));
1061 case IP6OPT_TYPE_DISCARD: /* silently discard */
1062 m_freem(m);
1063 return (-1);
1064 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1065 IP6_STATINC(IP6_STAT_BADOPTIONS);
1066 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1067 return (-1);
1068 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1069 IP6_STATINC(IP6_STAT_BADOPTIONS);
1070 ip6 = mtod(m, struct ip6_hdr *);
1071 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1072 (m->m_flags & (M_BCAST|M_MCAST)))
1073 m_freem(m);
1074 else
1075 icmp6_error(m, ICMP6_PARAM_PROB,
1076 ICMP6_PARAMPROB_OPTION, off);
1077 return (-1);
1078 }
1079
1080 m_freem(m); /* XXX: NOTREACHED */
1081 return (-1);
1082 }
1083
1084 /*
1085 * Create the "control" list for this pcb.
1086 *
1087 * The routine will be called from upper layer handlers like tcp6_input().
1088 * Thus the routine assumes that the caller (tcp6_input) have already
1089 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1090 * very first mbuf on the mbuf chain.
1091 * We may want to add some infinite loop prevention or sanity checks for safety.
1092 * (This applies only when you are using KAME mbuf chain restriction, i.e.
1093 * you are using IP6_EXTHDR_CHECK() not m_pulldown())
1094 */
1095 void
1096 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
1097 struct ip6_hdr *ip6, struct mbuf *m)
1098 {
1099 #ifdef RFC2292
1100 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1101 #else
1102 #define IS2292(x, y) (y)
1103 #endif
1104
1105 #ifdef SO_TIMESTAMP
1106 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
1107 struct timeval tv;
1108
1109 microtime(&tv);
1110 *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1111 SCM_TIMESTAMP, SOL_SOCKET);
1112 if (*mp)
1113 mp = &(*mp)->m_next;
1114 }
1115 #endif
1116
1117 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
1118 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
1119 return;
1120
1121 /* RFC 2292 sec. 5 */
1122 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
1123 struct in6_pktinfo pi6;
1124
1125 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1126 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1127 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
1128 m->m_pkthdr.rcvif->if_index : 0;
1129 *mp = sbcreatecontrol((void *) &pi6,
1130 sizeof(struct in6_pktinfo),
1131 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1132 if (*mp)
1133 mp = &(*mp)->m_next;
1134 }
1135
1136 if (in6p->in6p_flags & IN6P_HOPLIMIT) {
1137 int hlim = ip6->ip6_hlim & 0xff;
1138
1139 *mp = sbcreatecontrol((void *) &hlim, sizeof(int),
1140 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
1141 if (*mp)
1142 mp = &(*mp)->m_next;
1143 }
1144
1145 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
1146 u_int32_t flowinfo;
1147 int tclass;
1148
1149 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1150 flowinfo >>= 20;
1151
1152 tclass = flowinfo & 0xff;
1153 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
1154 IPV6_TCLASS, IPPROTO_IPV6);
1155
1156 if (*mp)
1157 mp = &(*mp)->m_next;
1158 }
1159
1160 /*
1161 * IPV6_HOPOPTS socket option. Recall that we required super-user
1162 * privilege for the option (see ip6_ctloutput), but it might be too
1163 * strict, since there might be some hop-by-hop options which can be
1164 * returned to normal user.
1165 * See also RFC3542 section 8 (or RFC2292 section 6).
1166 */
1167 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
1168 /*
1169 * Check if a hop-by-hop options header is contatined in the
1170 * received packet, and if so, store the options as ancillary
1171 * data. Note that a hop-by-hop options header must be
1172 * just after the IPv6 header, which fact is assured through
1173 * the IPv6 input processing.
1174 */
1175 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1176 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
1177 struct ip6_hbh *hbh;
1178 int hbhlen;
1179 struct mbuf *ext;
1180
1181 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1182 xip6->ip6_nxt);
1183 if (ext == NULL) {
1184 IP6_STATINC(IP6_STAT_TOOSHORT);
1185 return;
1186 }
1187 hbh = mtod(ext, struct ip6_hbh *);
1188 hbhlen = (hbh->ip6h_len + 1) << 3;
1189 if (hbhlen != ext->m_len) {
1190 m_freem(ext);
1191 IP6_STATINC(IP6_STAT_TOOSHORT);
1192 return;
1193 }
1194
1195 /*
1196 * XXX: We copy whole the header even if a jumbo
1197 * payload option is included, which option is to
1198 * be removed before returning in the RFC 2292.
1199 * Note: this constraint is removed in RFC3542.
1200 */
1201 *mp = sbcreatecontrol((void *)hbh, hbhlen,
1202 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1203 IPPROTO_IPV6);
1204 if (*mp)
1205 mp = &(*mp)->m_next;
1206 m_freem(ext);
1207 }
1208 }
1209
1210 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */
1211 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
1212 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
1213 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1214
1215 /*
1216 * Search for destination options headers or routing
1217 * header(s) through the header chain, and stores each
1218 * header as ancillary data.
1219 * Note that the order of the headers remains in
1220 * the chain of ancillary data.
1221 */
1222 for (;;) { /* is explicit loop prevention necessary? */
1223 struct ip6_ext *ip6e = NULL;
1224 int elen;
1225 struct mbuf *ext = NULL;
1226
1227 /*
1228 * if it is not an extension header, don't try to
1229 * pull it from the chain.
1230 */
1231 switch (nxt) {
1232 case IPPROTO_DSTOPTS:
1233 case IPPROTO_ROUTING:
1234 case IPPROTO_HOPOPTS:
1235 case IPPROTO_AH: /* is it possible? */
1236 break;
1237 default:
1238 goto loopend;
1239 }
1240
1241 ext = ip6_pullexthdr(m, off, nxt);
1242 if (ext == NULL) {
1243 IP6_STATINC(IP6_STAT_TOOSHORT);
1244 return;
1245 }
1246 ip6e = mtod(ext, struct ip6_ext *);
1247 if (nxt == IPPROTO_AH)
1248 elen = (ip6e->ip6e_len + 2) << 2;
1249 else
1250 elen = (ip6e->ip6e_len + 1) << 3;
1251 if (elen != ext->m_len) {
1252 m_freem(ext);
1253 IP6_STATINC(IP6_STAT_TOOSHORT);
1254 return;
1255 }
1256 KASSERT(IP6_HDR_ALIGNED_P(ip6e));
1257
1258 switch (nxt) {
1259 case IPPROTO_DSTOPTS:
1260 if (!(in6p->in6p_flags & IN6P_DSTOPTS))
1261 break;
1262
1263 *mp = sbcreatecontrol((void *)ip6e, elen,
1264 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1265 IPPROTO_IPV6);
1266 if (*mp)
1267 mp = &(*mp)->m_next;
1268 break;
1269
1270 case IPPROTO_ROUTING:
1271 if (!(in6p->in6p_flags & IN6P_RTHDR))
1272 break;
1273
1274 *mp = sbcreatecontrol((void *)ip6e, elen,
1275 IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
1276 IPPROTO_IPV6);
1277 if (*mp)
1278 mp = &(*mp)->m_next;
1279 break;
1280
1281 case IPPROTO_HOPOPTS:
1282 case IPPROTO_AH: /* is it possible? */
1283 break;
1284
1285 default:
1286 /*
1287 * other cases have been filtered in the above.
1288 * none will visit this case. here we supply
1289 * the code just in case (nxt overwritten or
1290 * other cases).
1291 */
1292 m_freem(ext);
1293 goto loopend;
1294
1295 }
1296
1297 /* proceed with the next header. */
1298 off += elen;
1299 nxt = ip6e->ip6e_nxt;
1300 ip6e = NULL;
1301 m_freem(ext);
1302 ext = NULL;
1303 }
1304 loopend:
1305 ;
1306 }
1307 }
1308 #undef IS2292
1309
1310
1311 void
1312 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
1313 uint32_t *mtu)
1314 {
1315 struct socket *so;
1316 struct mbuf *m_mtu;
1317 struct ip6_mtuinfo mtuctl;
1318
1319 so = in6p->in6p_socket;
1320
1321 if (mtu == NULL)
1322 return;
1323
1324 #ifdef DIAGNOSTIC
1325 if (so == NULL) /* I believe this is impossible */
1326 panic("ip6_notify_pmtu: socket is NULL");
1327 #endif
1328
1329 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
1330 mtuctl.ip6m_mtu = *mtu;
1331 mtuctl.ip6m_addr = *dst;
1332 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1333 return;
1334
1335 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
1336 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1337 return;
1338
1339 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
1340 == 0) {
1341 m_freem(m_mtu);
1342 /* XXX: should count statistics */
1343 } else
1344 sorwakeup(so);
1345
1346 return;
1347 }
1348
1349 /*
1350 * pull single extension header from mbuf chain. returns single mbuf that
1351 * contains the result, or NULL on error.
1352 */
1353 static struct mbuf *
1354 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1355 {
1356 struct ip6_ext ip6e;
1357 size_t elen;
1358 struct mbuf *n;
1359
1360 #ifdef DIAGNOSTIC
1361 switch (nxt) {
1362 case IPPROTO_DSTOPTS:
1363 case IPPROTO_ROUTING:
1364 case IPPROTO_HOPOPTS:
1365 case IPPROTO_AH: /* is it possible? */
1366 break;
1367 default:
1368 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1369 }
1370 #endif
1371
1372 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1373 if (nxt == IPPROTO_AH)
1374 elen = (ip6e.ip6e_len + 2) << 2;
1375 else
1376 elen = (ip6e.ip6e_len + 1) << 3;
1377
1378 MGET(n, M_DONTWAIT, MT_DATA);
1379 if (n && elen >= MLEN) {
1380 MCLGET(n, M_DONTWAIT);
1381 if ((n->m_flags & M_EXT) == 0) {
1382 m_free(n);
1383 n = NULL;
1384 }
1385 }
1386 if (!n)
1387 return NULL;
1388
1389 n->m_len = 0;
1390 if (elen >= M_TRAILINGSPACE(n)) {
1391 m_free(n);
1392 return NULL;
1393 }
1394
1395 m_copydata(m, off, elen, mtod(n, void *));
1396 n->m_len = elen;
1397 return n;
1398 }
1399
1400 /*
1401 * Get pointer to the previous header followed by the header
1402 * currently processed.
1403 * XXX: This function supposes that
1404 * M includes all headers,
1405 * the next header field and the header length field of each header
1406 * are valid, and
1407 * the sum of each header length equals to OFF.
1408 * Because of these assumptions, this function must be called very
1409 * carefully. Moreover, it will not be used in the near future when
1410 * we develop `neater' mechanism to process extension headers.
1411 */
1412 u_int8_t *
1413 ip6_get_prevhdr(struct mbuf *m, int off)
1414 {
1415 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1416
1417 if (off == sizeof(struct ip6_hdr))
1418 return (&ip6->ip6_nxt);
1419 else {
1420 int len, nxt;
1421 struct ip6_ext *ip6e = NULL;
1422
1423 nxt = ip6->ip6_nxt;
1424 len = sizeof(struct ip6_hdr);
1425 while (len < off) {
1426 ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
1427
1428 switch (nxt) {
1429 case IPPROTO_FRAGMENT:
1430 len += sizeof(struct ip6_frag);
1431 break;
1432 case IPPROTO_AH:
1433 len += (ip6e->ip6e_len + 2) << 2;
1434 break;
1435 default:
1436 len += (ip6e->ip6e_len + 1) << 3;
1437 break;
1438 }
1439 nxt = ip6e->ip6e_nxt;
1440 }
1441 if (ip6e)
1442 return (&ip6e->ip6e_nxt);
1443 else
1444 return NULL;
1445 }
1446 }
1447
1448 /*
1449 * get next header offset. m will be retained.
1450 */
1451 int
1452 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1453 {
1454 struct ip6_hdr ip6;
1455 struct ip6_ext ip6e;
1456 struct ip6_frag fh;
1457
1458 /* just in case */
1459 if (m == NULL)
1460 panic("ip6_nexthdr: m == NULL");
1461 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1462 return -1;
1463
1464 switch (proto) {
1465 case IPPROTO_IPV6:
1466 /* do not chase beyond intermediate IPv6 headers */
1467 if (off != 0)
1468 return -1;
1469 if (m->m_pkthdr.len < off + sizeof(ip6))
1470 return -1;
1471 m_copydata(m, off, sizeof(ip6), (void *)&ip6);
1472 if (nxtp)
1473 *nxtp = ip6.ip6_nxt;
1474 off += sizeof(ip6);
1475 return off;
1476
1477 case IPPROTO_FRAGMENT:
1478 /*
1479 * terminate parsing if it is not the first fragment,
1480 * it does not make sense to parse through it.
1481 */
1482 if (m->m_pkthdr.len < off + sizeof(fh))
1483 return -1;
1484 m_copydata(m, off, sizeof(fh), (void *)&fh);
1485 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
1486 return -1;
1487 if (nxtp)
1488 *nxtp = fh.ip6f_nxt;
1489 off += sizeof(struct ip6_frag);
1490 return off;
1491
1492 case IPPROTO_AH:
1493 if (m->m_pkthdr.len < off + sizeof(ip6e))
1494 return -1;
1495 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1496 if (nxtp)
1497 *nxtp = ip6e.ip6e_nxt;
1498 off += (ip6e.ip6e_len + 2) << 2;
1499 if (m->m_pkthdr.len < off)
1500 return -1;
1501 return off;
1502
1503 case IPPROTO_HOPOPTS:
1504 case IPPROTO_ROUTING:
1505 case IPPROTO_DSTOPTS:
1506 if (m->m_pkthdr.len < off + sizeof(ip6e))
1507 return -1;
1508 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
1509 if (nxtp)
1510 *nxtp = ip6e.ip6e_nxt;
1511 off += (ip6e.ip6e_len + 1) << 3;
1512 if (m->m_pkthdr.len < off)
1513 return -1;
1514 return off;
1515
1516 case IPPROTO_NONE:
1517 case IPPROTO_ESP:
1518 case IPPROTO_IPCOMP:
1519 /* give up */
1520 return -1;
1521
1522 default:
1523 return -1;
1524 }
1525 }
1526
1527 /*
1528 * get offset for the last header in the chain. m will be kept untainted.
1529 */
1530 int
1531 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1532 {
1533 int newoff;
1534 int nxt;
1535
1536 if (!nxtp) {
1537 nxt = -1;
1538 nxtp = &nxt;
1539 }
1540 for (;;) {
1541 newoff = ip6_nexthdr(m, off, proto, nxtp);
1542 if (newoff < 0)
1543 return off;
1544 else if (newoff < off)
1545 return -1; /* invalid */
1546 else if (newoff == off)
1547 return newoff;
1548
1549 off = newoff;
1550 proto = *nxtp;
1551 }
1552 }
1553
1554 struct m_tag *
1555 ip6_addaux(struct mbuf *m)
1556 {
1557 struct m_tag *mtag;
1558
1559 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1560 if (!mtag) {
1561 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
1562 M_NOWAIT);
1563 if (mtag) {
1564 m_tag_prepend(m, mtag);
1565 bzero(mtag + 1, sizeof(struct ip6aux));
1566 }
1567 }
1568 return mtag;
1569 }
1570
1571 struct m_tag *
1572 ip6_findaux(struct mbuf *m)
1573 {
1574 struct m_tag *mtag;
1575
1576 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1577 return mtag;
1578 }
1579
1580 void
1581 ip6_delaux(struct mbuf *m)
1582 {
1583 struct m_tag *mtag;
1584
1585 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
1586 if (mtag)
1587 m_tag_delete(m, mtag);
1588 }
1589
1590 #ifdef GATEWAY
1591 /*
1592 * sysctl helper routine for net.inet.ip6.maxflows. Since
1593 * we could reduce this value, call ip6flow_reap();
1594 */
1595 static int
1596 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
1597 {
1598 int error;
1599
1600 error = sysctl_lookup(SYSCTLFN_CALL(rnode));
1601 if (error || newp == NULL)
1602 return (error);
1603
1604 mutex_enter(softnet_lock);
1605 KERNEL_LOCK(1, NULL);
1606
1607 ip6flow_reap(0);
1608
1609 KERNEL_UNLOCK_ONE(NULL);
1610 mutex_exit(softnet_lock);
1611
1612 return (0);
1613 }
1614
1615 static int
1616 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
1617 {
1618 int error, tmp;
1619 struct sysctlnode node;
1620
1621 node = *rnode;
1622 tmp = ip6_hashsize;
1623 node.sysctl_data = &tmp;
1624 error = sysctl_lookup(SYSCTLFN_CALL(&node));
1625 if (error || newp == NULL)
1626 return (error);
1627
1628 if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
1629 /*
1630 * Can only fail due to malloc()
1631 */
1632 mutex_enter(softnet_lock);
1633 KERNEL_LOCK(1, NULL);
1634
1635 error = ip6flow_invalidate_all(tmp);
1636
1637 KERNEL_UNLOCK_ONE(NULL);
1638 mutex_exit(softnet_lock);
1639 } else {
1640 /*
1641 * EINVAL if not a power of 2
1642 */
1643 error = EINVAL;
1644 }
1645
1646 return error;
1647 }
1648 #endif /* GATEWAY */
1649
1650 /*
1651 * System control for IP6
1652 */
1653
1654 const u_char inet6ctlerrmap[PRC_NCMDS] = {
1655 0, 0, 0, 0,
1656 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1657 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1658 EMSGSIZE, EHOSTUNREACH, 0, 0,
1659 0, 0, 0, 0,
1660 ENOPROTOOPT
1661 };
1662
1663 static int
1664 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
1665 {
1666
1667 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
1668 }
1669
1670 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup")
1671 {
1672 #ifdef RFC2292
1673 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
1674 #else
1675 #define IS2292(x, y) (y)
1676 #endif
1677
1678 sysctl_createv(clog, 0, NULL, NULL,
1679 CTLFLAG_PERMANENT,
1680 CTLTYPE_NODE, "net", NULL,
1681 NULL, 0, NULL, 0,
1682 CTL_NET, CTL_EOL);
1683 sysctl_createv(clog, 0, NULL, NULL,
1684 CTLFLAG_PERMANENT,
1685 CTLTYPE_NODE, "inet6",
1686 SYSCTL_DESCR("PF_INET6 related settings"),
1687 NULL, 0, NULL, 0,
1688 CTL_NET, PF_INET6, CTL_EOL);
1689 sysctl_createv(clog, 0, NULL, NULL,
1690 CTLFLAG_PERMANENT,
1691 CTLTYPE_NODE, "ip6",
1692 SYSCTL_DESCR("IPv6 related settings"),
1693 NULL, 0, NULL, 0,
1694 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
1695
1696 sysctl_createv(clog, 0, NULL, NULL,
1697 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1698 CTLTYPE_INT, "forwarding",
1699 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
1700 NULL, 0, &ip6_forwarding, 0,
1701 CTL_NET, PF_INET6, IPPROTO_IPV6,
1702 IPV6CTL_FORWARDING, CTL_EOL);
1703 sysctl_createv(clog, 0, NULL, NULL,
1704 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1705 CTLTYPE_INT, "redirect",
1706 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
1707 NULL, 0, &ip6_sendredirects, 0,
1708 CTL_NET, PF_INET6, IPPROTO_IPV6,
1709 IPV6CTL_SENDREDIRECTS, CTL_EOL);
1710 sysctl_createv(clog, 0, NULL, NULL,
1711 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1712 CTLTYPE_INT, "hlim",
1713 SYSCTL_DESCR("Hop limit for an INET6 datagram"),
1714 NULL, 0, &ip6_defhlim, 0,
1715 CTL_NET, PF_INET6, IPPROTO_IPV6,
1716 IPV6CTL_DEFHLIM, CTL_EOL);
1717 #ifdef notyet
1718 sysctl_createv(clog, 0, NULL, NULL,
1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1720 CTLTYPE_INT, "mtu", NULL,
1721 NULL, 0, &, 0,
1722 CTL_NET, PF_INET6, IPPROTO_IPV6,
1723 IPV6CTL_DEFMTU, CTL_EOL);
1724 #endif
1725 #ifdef __no_idea__
1726 sysctl_createv(clog, 0, NULL, NULL,
1727 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1728 CTLTYPE_INT, "forwsrcrt", NULL,
1729 NULL, 0, &?, 0,
1730 CTL_NET, PF_INET6, IPPROTO_IPV6,
1731 IPV6CTL_FORWSRCRT, CTL_EOL);
1732 sysctl_createv(clog, 0, NULL, NULL,
1733 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1734 CTLTYPE_STRUCT, "mrtstats", NULL,
1735 NULL, 0, &?, sizeof(?),
1736 CTL_NET, PF_INET6, IPPROTO_IPV6,
1737 IPV6CTL_MRTSTATS, CTL_EOL);
1738 sysctl_createv(clog, 0, NULL, NULL,
1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1740 CTLTYPE_?, "mrtproto", NULL,
1741 NULL, 0, &?, sizeof(?),
1742 CTL_NET, PF_INET6, IPPROTO_IPV6,
1743 IPV6CTL_MRTPROTO, CTL_EOL);
1744 #endif
1745 sysctl_createv(clog, 0, NULL, NULL,
1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1747 CTLTYPE_INT, "maxfragpackets",
1748 SYSCTL_DESCR("Maximum number of fragments to buffer "
1749 "for reassembly"),
1750 NULL, 0, &ip6_maxfragpackets, 0,
1751 CTL_NET, PF_INET6, IPPROTO_IPV6,
1752 IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
1753 #ifdef __no_idea__
1754 sysctl_createv(clog, 0, NULL, NULL,
1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1756 CTLTYPE_INT, "sourcecheck", NULL,
1757 NULL, 0, &?, 0,
1758 CTL_NET, PF_INET6, IPPROTO_IPV6,
1759 IPV6CTL_SOURCECHECK, CTL_EOL);
1760 sysctl_createv(clog, 0, NULL, NULL,
1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1762 CTLTYPE_INT, "sourcecheck_logint", NULL,
1763 NULL, 0, &?, 0,
1764 CTL_NET, PF_INET6, IPPROTO_IPV6,
1765 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
1766 #endif
1767 sysctl_createv(clog, 0, NULL, NULL,
1768 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1769 CTLTYPE_INT, "accept_rtadv",
1770 SYSCTL_DESCR("Accept router advertisements"),
1771 NULL, 0, &ip6_accept_rtadv, 0,
1772 CTL_NET, PF_INET6, IPPROTO_IPV6,
1773 IPV6CTL_ACCEPT_RTADV, CTL_EOL);
1774 sysctl_createv(clog, 0, NULL, NULL,
1775 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1776 CTLTYPE_INT, "keepfaith",
1777 SYSCTL_DESCR("Activate faith interface"),
1778 NULL, 0, &ip6_keepfaith, 0,
1779 CTL_NET, PF_INET6, IPPROTO_IPV6,
1780 IPV6CTL_KEEPFAITH, CTL_EOL);
1781 sysctl_createv(clog, 0, NULL, NULL,
1782 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1783 CTLTYPE_INT, "log_interval",
1784 SYSCTL_DESCR("Minumum interval between logging "
1785 "unroutable packets"),
1786 NULL, 0, &ip6_log_interval, 0,
1787 CTL_NET, PF_INET6, IPPROTO_IPV6,
1788 IPV6CTL_LOG_INTERVAL, CTL_EOL);
1789 sysctl_createv(clog, 0, NULL, NULL,
1790 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1791 CTLTYPE_INT, "hdrnestlimit",
1792 SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
1793 NULL, 0, &ip6_hdrnestlimit, 0,
1794 CTL_NET, PF_INET6, IPPROTO_IPV6,
1795 IPV6CTL_HDRNESTLIMIT, CTL_EOL);
1796 sysctl_createv(clog, 0, NULL, NULL,
1797 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1798 CTLTYPE_INT, "dad_count",
1799 SYSCTL_DESCR("Number of Duplicate Address Detection "
1800 "probes to send"),
1801 NULL, 0, &ip6_dad_count, 0,
1802 CTL_NET, PF_INET6, IPPROTO_IPV6,
1803 IPV6CTL_DAD_COUNT, CTL_EOL);
1804 sysctl_createv(clog, 0, NULL, NULL,
1805 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1806 CTLTYPE_INT, "auto_flowlabel",
1807 SYSCTL_DESCR("Assign random IPv6 flow labels"),
1808 NULL, 0, &ip6_auto_flowlabel, 0,
1809 CTL_NET, PF_INET6, IPPROTO_IPV6,
1810 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
1811 sysctl_createv(clog, 0, NULL, NULL,
1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1813 CTLTYPE_INT, "defmcasthlim",
1814 SYSCTL_DESCR("Default multicast hop limit"),
1815 NULL, 0, &ip6_defmcasthlim, 0,
1816 CTL_NET, PF_INET6, IPPROTO_IPV6,
1817 IPV6CTL_DEFMCASTHLIM, CTL_EOL);
1818 #if NGIF > 0
1819 sysctl_createv(clog, 0, NULL, NULL,
1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1821 CTLTYPE_INT, "gifhlim",
1822 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
1823 NULL, 0, &ip6_gif_hlim, 0,
1824 CTL_NET, PF_INET6, IPPROTO_IPV6,
1825 IPV6CTL_GIF_HLIM, CTL_EOL);
1826 #endif /* NGIF */
1827 sysctl_createv(clog, 0, NULL, NULL,
1828 CTLFLAG_PERMANENT,
1829 CTLTYPE_STRING, "kame_version",
1830 SYSCTL_DESCR("KAME Version"),
1831 NULL, 0, __UNCONST(__KAME_VERSION), 0,
1832 CTL_NET, PF_INET6, IPPROTO_IPV6,
1833 IPV6CTL_KAME_VERSION, CTL_EOL);
1834 sysctl_createv(clog, 0, NULL, NULL,
1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1836 CTLTYPE_INT, "use_deprecated",
1837 SYSCTL_DESCR("Allow use of deprecated addresses as "
1838 "source addresses"),
1839 NULL, 0, &ip6_use_deprecated, 0,
1840 CTL_NET, PF_INET6, IPPROTO_IPV6,
1841 IPV6CTL_USE_DEPRECATED, CTL_EOL);
1842 sysctl_createv(clog, 0, NULL, NULL,
1843 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1844 CTLTYPE_INT, "rr_prune", NULL,
1845 NULL, 0, &ip6_rr_prune, 0,
1846 CTL_NET, PF_INET6, IPPROTO_IPV6,
1847 IPV6CTL_RR_PRUNE, CTL_EOL);
1848 sysctl_createv(clog, 0, NULL, NULL,
1849 CTLFLAG_PERMANENT
1850 #ifndef INET6_BINDV6ONLY
1851 |CTLFLAG_READWRITE,
1852 #endif
1853 CTLTYPE_INT, "v6only",
1854 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
1855 "to PF_INET sockets"),
1856 NULL, 0, &ip6_v6only, 0,
1857 CTL_NET, PF_INET6, IPPROTO_IPV6,
1858 IPV6CTL_V6ONLY, CTL_EOL);
1859 sysctl_createv(clog, 0, NULL, NULL,
1860 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1861 CTLTYPE_INT, "anonportmin",
1862 SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1863 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
1864 CTL_NET, PF_INET6, IPPROTO_IPV6,
1865 IPV6CTL_ANONPORTMIN, CTL_EOL);
1866 sysctl_createv(clog, 0, NULL, NULL,
1867 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1868 CTLTYPE_INT, "anonportmax",
1869 SYSCTL_DESCR("Highest ephemeral port number to assign"),
1870 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
1871 CTL_NET, PF_INET6, IPPROTO_IPV6,
1872 IPV6CTL_ANONPORTMAX, CTL_EOL);
1873 #ifndef IPNOPRIVPORTS
1874 sysctl_createv(clog, 0, NULL, NULL,
1875 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1876 CTLTYPE_INT, "lowportmin",
1877 SYSCTL_DESCR("Lowest privileged ephemeral port number "
1878 "to assign"),
1879 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
1880 CTL_NET, PF_INET6, IPPROTO_IPV6,
1881 IPV6CTL_LOWPORTMIN, CTL_EOL);
1882 sysctl_createv(clog, 0, NULL, NULL,
1883 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1884 CTLTYPE_INT, "lowportmax",
1885 SYSCTL_DESCR("Highest privileged ephemeral port number "
1886 "to assign"),
1887 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
1888 CTL_NET, PF_INET6, IPPROTO_IPV6,
1889 IPV6CTL_LOWPORTMAX, CTL_EOL);
1890 #endif /* IPNOPRIVPORTS */
1891 sysctl_createv(clog, 0, NULL, NULL,
1892 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1893 CTLTYPE_INT, "use_tempaddr",
1894 SYSCTL_DESCR("Use temporary address"),
1895 NULL, 0, &ip6_use_tempaddr, 0,
1896 CTL_NET, PF_INET6, IPPROTO_IPV6,
1897 CTL_CREATE, CTL_EOL);
1898 sysctl_createv(clog, 0, NULL, NULL,
1899 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1900 CTLTYPE_INT, "temppltime",
1901 SYSCTL_DESCR("preferred lifetime of a temporary address"),
1902 NULL, 0, &ip6_temp_preferred_lifetime, 0,
1903 CTL_NET, PF_INET6, IPPROTO_IPV6,
1904 CTL_CREATE, CTL_EOL);
1905 sysctl_createv(clog, 0, NULL, NULL,
1906 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1907 CTLTYPE_INT, "tempvltime",
1908 SYSCTL_DESCR("valid lifetime of a temporary address"),
1909 NULL, 0, &ip6_temp_valid_lifetime, 0,
1910 CTL_NET, PF_INET6, IPPROTO_IPV6,
1911 CTL_CREATE, CTL_EOL);
1912 sysctl_createv(clog, 0, NULL, NULL,
1913 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1914 CTLTYPE_INT, "maxfrags",
1915 SYSCTL_DESCR("Maximum fragments in reassembly queue"),
1916 NULL, 0, &ip6_maxfrags, 0,
1917 CTL_NET, PF_INET6, IPPROTO_IPV6,
1918 IPV6CTL_MAXFRAGS, CTL_EOL);
1919 sysctl_createv(clog, 0, NULL, NULL,
1920 CTLFLAG_PERMANENT,
1921 CTLTYPE_STRUCT, "stats",
1922 SYSCTL_DESCR("IPv6 statistics"),
1923 sysctl_net_inet6_ip6_stats, 0, NULL, 0,
1924 CTL_NET, PF_INET6, IPPROTO_IPV6,
1925 IPV6CTL_STATS, CTL_EOL);
1926 sysctl_createv(clog, 0, NULL, NULL,
1927 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1928 CTLTYPE_INT, "use_defaultzone",
1929 SYSCTL_DESCR("Whether to use the default scope zones"),
1930 NULL, 0, &ip6_use_defzone, 0,
1931 CTL_NET, PF_INET6, IPPROTO_IPV6,
1932 IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
1933 sysctl_createv(clog, 0, NULL, NULL,
1934 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1935 CTLTYPE_INT, "mcast_pmtu",
1936 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
1937 NULL, 0, &ip6_mcast_pmtu, 0,
1938 CTL_NET, PF_INET6, IPPROTO_IPV6,
1939 CTL_CREATE, CTL_EOL);
1940 #ifdef GATEWAY
1941 sysctl_createv(clog, 0, NULL, NULL,
1942 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1943 CTLTYPE_INT, "maxflows",
1944 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
1945 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
1946 CTL_NET, PF_INET6, IPPROTO_IPV6,
1947 CTL_CREATE, CTL_EOL);
1948 sysctl_createv(clog, 0, NULL, NULL,
1949 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1950 CTLTYPE_INT, "hashsize",
1951 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
1952 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
1953 CTL_NET, PF_INET6, IPPROTO_IPV6,
1954 CTL_CREATE, CTL_EOL);
1955 #endif
1956 }
1957
1958 void
1959 ip6_statinc(u_int stat)
1960 {
1961
1962 KASSERT(stat < IP6_NSTATS);
1963 IP6_STATINC(stat);
1964 }
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