1 /* $NetBSD: icmp6.c,v 1.254 2022/10/28 05:25:36 ozaki-r Exp $ */
2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei 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_icmp.c 8.2 (Berkeley) 1/4/94
62 */
63
64 #include <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.254 2022/10/28 05:25:36 ozaki-r Exp $");
66
67 #ifdef _KERNEL_OPT
68 #include "opt_compat_netbsd.h"
69 #include "opt_inet.h"
70 #include "opt_ipsec.h"
71 #endif
72
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/kmem.h>
76 #include <sys/mbuf.h>
77 #include <sys/protosw.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
80 #include <sys/time.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83 #include <sys/domain.h>
84 #include <sys/sysctl.h>
85
86 #include <net/if.h>
87 #include <net/route.h>
88 #include <net/if_dl.h>
89 #include <net/if_types.h>
90 #include <net/nd.h>
91
92 #include <netinet/in.h>
93 #include <netinet/in_pcb.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip6.h>
96 #include <netinet/wqinput.h>
97 #include <netinet6/ip6_var.h>
98 #include <netinet6/ip6_private.h>
99 #include <netinet/icmp6.h>
100 #include <netinet6/icmp6_private.h>
101 #include <netinet6/mld6_var.h>
102 #include <netinet6/in6_pcb.h>
103 #include <netinet6/in6_ifattach.h>
104 #include <netinet6/ip6protosw.h>
105 #include <netinet6/nd6.h>
106 #include <netinet6/scope6_var.h>
107
108 #ifdef IPSEC
109 #include <netipsec/ipsec.h>
110 #include <netipsec/ipsec6.h>
111 #include <netipsec/key.h>
112 #endif
113
114 #include "faith.h"
115 #if defined(NFAITH) && 0 < NFAITH
116 #include <net/if_faith.h>
117 #endif
118
119 /* Ensure that non packed structures are the desired size. */
120 __CTASSERT(sizeof(struct icmp6_hdr) == 8);
121 __CTASSERT(sizeof(struct icmp6_nodeinfo) == 16);
122 __CTASSERT(sizeof(struct icmp6_namelookup) == 20);
123 __CTASSERT(sizeof(struct icmp6_router_renum) == 16);
124
125 __CTASSERT(sizeof(struct nd_router_solicit) == 8);
126 __CTASSERT(sizeof(struct nd_router_advert) == 16);
127 __CTASSERT(sizeof(struct nd_neighbor_solicit) == 24);
128 __CTASSERT(sizeof(struct nd_neighbor_advert) == 24);
129 __CTASSERT(sizeof(struct nd_redirect) == 40);
130 __CTASSERT(sizeof(struct nd_opt_hdr) == 2);
131 __CTASSERT(sizeof(struct nd_opt_route_info) == 8);
132 __CTASSERT(sizeof(struct nd_opt_prefix_info) == 32);
133 __CTASSERT(sizeof(struct nd_opt_rd_hdr) == 8);
134 __CTASSERT(sizeof(struct nd_opt_mtu) == 8);
135 __CTASSERT(sizeof(struct nd_opt_nonce) == 2 + ND_OPT_NONCE_LEN);
136 __CTASSERT(sizeof(struct nd_opt_rdnss) == 8);
137 __CTASSERT(sizeof(struct nd_opt_dnssl) == 8);
138
139 __CTASSERT(sizeof(struct mld_hdr) == 24);
140 __CTASSERT(sizeof(struct ni_reply_fqdn) == 8);
141 __CTASSERT(sizeof(struct rr_pco_match) == 24);
142 __CTASSERT(sizeof(struct rr_pco_use) == 32);
143 __CTASSERT(sizeof(struct rr_result) == 24);
144
145 extern struct domain inet6domain;
146
147 percpu_t *icmp6stat_percpu;
148
149 extern struct inpcbtable raw6cbtable;
150 extern int icmp6errppslim;
151 static int icmp6errpps_count = 0;
152 static struct timeval icmp6errppslim_last;
153 extern int icmp6_nodeinfo;
154
155 bool icmp6_dynamic_rt_msg = false;
156
157 /*
158 * List of callbacks to notify when Path MTU changes are made.
159 */
160 struct icmp6_mtudisc_callback {
161 LIST_ENTRY(icmp6_mtudisc_callback) mc_list;
162 void (*mc_func)(struct in6_addr *);
163 };
164
165 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks =
166 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks);
167
168 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL;
169 extern int pmtu_expire;
170
171 /* XXX do these values make any sense? */
172 static int icmp6_mtudisc_hiwat = 1280;
173 static int icmp6_mtudisc_lowat = 256;
174
175 /*
176 * keep track of # of redirect routes.
177 */
178 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL;
179
180 /* XXX experimental, turned off */
181 static int icmp6_redirect_hiwat = -1;
182 static int icmp6_redirect_lowat = -1;
183
184 /* Protect mtudisc and redirect stuffs */
185 static kmutex_t icmp6_mtx __cacheline_aligned;
186
187 static bool icmp6_reflect_pmtu = false;
188
189 static void icmp6_errcount(u_int, int, int);
190 static int icmp6_rip6_input(struct mbuf **, int);
191 static void icmp6_reflect(struct mbuf *, size_t);
192 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
193 static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *,
194 struct in6_addr *, struct in6_addr *);
195 static void icmp6_redirect_input(struct mbuf *, int);
196 static struct mbuf *ni6_input(struct mbuf *, int);
197 static struct mbuf *ni6_nametodns(const char *, int, int);
198 static int ni6_dnsmatch(const char *, int, const char *, int);
199 static int ni6_addrs(struct icmp6_nodeinfo *, struct ifnet **, char *,
200 struct psref *);
201 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
202 struct ifnet *, int);
203 static int icmp6_notify_error(struct mbuf *, int, int, int);
204 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *);
205 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *);
206 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *);
207 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **);
208
209 /* workqueue-based pr_input */
210 static struct wqinput *icmp6_wqinput;
211 static void _icmp6_input(struct mbuf *m, int off, int proto);
212
213 void
icmp6_init(void)214 icmp6_init(void)
215 {
216
217 sysctl_net_inet6_icmp6_setup(NULL);
218 mld_init();
219
220 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE);
221 mutex_enter(&icmp6_mtx);
222 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire);
223 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout);
224 mutex_exit(&icmp6_mtx);
225
226 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS);
227
228 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input);
229 }
230
231 static void
icmp6_errcount(u_int base,int type,int code)232 icmp6_errcount(u_int base, int type, int code)
233 {
234 switch (type) {
235 case ICMP6_DST_UNREACH:
236 switch (code) {
237 case ICMP6_DST_UNREACH_NOROUTE:
238 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE);
239 return;
240 case ICMP6_DST_UNREACH_ADMIN:
241 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN);
242 return;
243 case ICMP6_DST_UNREACH_BEYONDSCOPE:
244 ICMP6_STATINC(base +
245 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE);
246 return;
247 case ICMP6_DST_UNREACH_ADDR:
248 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR);
249 return;
250 case ICMP6_DST_UNREACH_NOPORT:
251 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT);
252 return;
253 }
254 break;
255 case ICMP6_PACKET_TOO_BIG:
256 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG);
257 return;
258 case ICMP6_TIME_EXCEEDED:
259 switch (code) {
260 case ICMP6_TIME_EXCEED_TRANSIT:
261 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT);
262 return;
263 case ICMP6_TIME_EXCEED_REASSEMBLY:
264 ICMP6_STATINC(base +
265 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY);
266 return;
267 }
268 break;
269 case ICMP6_PARAM_PROB:
270 switch (code) {
271 case ICMP6_PARAMPROB_HEADER:
272 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER);
273 return;
274 case ICMP6_PARAMPROB_NEXTHEADER:
275 ICMP6_STATINC(base +
276 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER);
277 return;
278 case ICMP6_PARAMPROB_OPTION:
279 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION);
280 return;
281 }
282 break;
283 case ND_REDIRECT:
284 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT);
285 return;
286 }
287 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN);
288 }
289
290 /*
291 * Register a Path MTU Discovery callback.
292 */
293 void
icmp6_mtudisc_callback_register(void (* func)(struct in6_addr *))294 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *))
295 {
296 struct icmp6_mtudisc_callback *mc, *new;
297
298 new = kmem_alloc(sizeof(*mc), KM_SLEEP);
299
300 mutex_enter(&icmp6_mtx);
301 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
302 mc = LIST_NEXT(mc, mc_list)) {
303 if (mc->mc_func == func) {
304 mutex_exit(&icmp6_mtx);
305 kmem_free(new, sizeof(*mc));
306 return;
307 }
308 }
309
310 new->mc_func = func;
311 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list);
312 mutex_exit(&icmp6_mtx);
313 }
314
315 /*
316 * A wrapper function for icmp6_error() necessary when the erroneous packet
317 * may not contain enough scope zone information.
318 */
319 void
icmp6_error2(struct mbuf * m,int type,int code,int param,struct ifnet * ifp,struct in6_addr * src)320 icmp6_error2(struct mbuf *m, int type, int code, int param,
321 struct ifnet *ifp, struct in6_addr *src)
322 {
323 struct ip6_hdr *ip6;
324
325 KASSERT(ifp != NULL);
326
327 if (m->m_len < sizeof(struct ip6_hdr)) {
328 m = m_pullup(m, sizeof(struct ip6_hdr));
329 if (m == NULL)
330 return;
331 }
332
333 ip6 = mtod(m, struct ip6_hdr *);
334
335 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
336 goto out;
337 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
338 goto out;
339
340 *src = ip6->ip6_src;
341 icmp6_error(m, type, code, param);
342 return;
343
344 out:
345 m_freem(m);
346 }
347
348 /*
349 * Generate an error packet of type error in response to bad IP6 packet.
350 */
351 void
icmp6_error(struct mbuf * m,int type,int code,int param)352 icmp6_error(struct mbuf *m, int type, int code, int param)
353 {
354 struct ip6_hdr *oip6, *nip6;
355 struct icmp6_hdr *icmp6;
356 u_int preplen;
357 int off;
358 int nxt;
359
360 ICMP6_STATINC(ICMP6_STAT_ERROR);
361
362 /* count per-type-code statistics */
363 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code);
364
365 if (m->m_flags & M_DECRYPTED) {
366 ICMP6_STATINC(ICMP6_STAT_CANTERROR);
367 goto freeit;
368 }
369
370 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) &&
371 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL)
372 return;
373 oip6 = mtod(m, struct ip6_hdr *);
374
375 /*
376 * If the destination address of the erroneous packet is a multicast
377 * address, or the packet was sent using link-layer multicast,
378 * we should basically suppress sending an error (RFC 2463, Section
379 * 2.4).
380 * We have two exceptions (the item e.2 in that section):
381 * - the Packet Too Big message can be sent for path MTU discovery.
382 * - the Parameter Problem Message that can be allowed an icmp6 error
383 * in the option type field. This check has been done in
384 * ip6_unknown_opt(), so we can just check the type and code.
385 */
386 if ((m->m_flags & (M_BCAST|M_MCAST) ||
387 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
388 (type != ICMP6_PACKET_TOO_BIG &&
389 (type != ICMP6_PARAM_PROB ||
390 code != ICMP6_PARAMPROB_OPTION)))
391 goto freeit;
392
393 /*
394 * RFC 2463, 2.4 (e.5): source address check.
395 * XXX: the case of anycast source?
396 */
397 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
398 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
399 goto freeit;
400
401 /*
402 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
403 * don't do it.
404 */
405 nxt = -1;
406 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
407 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
408 struct icmp6_hdr *icp;
409
410 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
411 sizeof(*icp));
412 if (icp == NULL) {
413 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
414 return;
415 }
416 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
417 icp->icmp6_type == ND_REDIRECT) {
418 /*
419 * ICMPv6 error
420 * Special case: for redirect (which is
421 * informational) we must not send icmp6 error.
422 */
423 ICMP6_STATINC(ICMP6_STAT_CANTERROR);
424 goto freeit;
425 } else {
426 /* ICMPv6 informational - send the error */
427 }
428 } else {
429 /* non-ICMPv6 - send the error */
430 }
431
432 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
433
434 /* Finally, do rate limitation check. */
435 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
436 ICMP6_STATINC(ICMP6_STAT_TOOFREQ);
437 goto freeit;
438 }
439
440 /*
441 * OK, ICMP6 can be generated.
442 */
443
444 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
445 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
446
447 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
448 M_PREPEND(m, preplen, M_DONTWAIT);
449 if (m && M_UNWRITABLE(m, preplen))
450 m = m_pullup(m, preplen);
451 if (m == NULL) {
452 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__);
453 return;
454 }
455
456 nip6 = mtod(m, struct ip6_hdr *);
457 nip6->ip6_src = oip6->ip6_src;
458 nip6->ip6_dst = oip6->ip6_dst;
459
460 in6_clearscope(&oip6->ip6_src);
461 in6_clearscope(&oip6->ip6_dst);
462
463 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
464 icmp6->icmp6_type = type;
465 icmp6->icmp6_code = code;
466 icmp6->icmp6_pptr = htonl((u_int32_t)param);
467
468 /*
469 * icmp6_reflect() is designed to be in the input path.
470 * icmp6_error() can be called from both input and output path,
471 * and if we are in output path rcvif could contain bogus value.
472 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
473 * information in ip header (nip6).
474 */
475 m_reset_rcvif(m);
476
477 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type);
478
479 /* header order: IPv6 - ICMPv6 */
480 icmp6_reflect(m, sizeof(struct ip6_hdr));
481
482 return;
483
484 freeit:
485 /*
486 * If we can't tell whether or not we can generate ICMP6, free it.
487 */
488 m_freem(m);
489 }
490
491 /*
492 * Process a received ICMP6 message.
493 */
494 static void
_icmp6_input(struct mbuf * m,int off,int proto)495 _icmp6_input(struct mbuf *m, int off, int proto)
496 {
497 struct mbuf *n;
498 struct ip6_hdr *ip6, *nip6;
499 struct icmp6_hdr *icmp6, *nicmp6;
500 int icmp6len = m->m_pkthdr.len - off;
501 int code, sum;
502 struct ifnet *rcvif;
503 struct psref psref;
504 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN];
505
506 rcvif = m_get_rcvif_psref(m, &psref);
507 if (__predict_false(rcvif == NULL))
508 goto freeit;
509
510 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4)
511 KASSERT(ICMP6_MAXLEN < MCLBYTES);
512 icmp6_ifstat_inc(rcvif, ifs6_in_msg);
513
514 /*
515 * Locate icmp6 structure in mbuf, and check
516 * that not corrupted and of at least minimum length
517 */
518
519 if (icmp6len < sizeof(struct icmp6_hdr)) {
520 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
521 icmp6_ifstat_inc(rcvif, ifs6_in_error);
522 goto freeit;
523 }
524
525 if (m->m_len < sizeof(struct ip6_hdr)) {
526 m = m_pullup(m, sizeof(struct ip6_hdr));
527 if (m == NULL) {
528 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
529 icmp6_ifstat_inc(rcvif, ifs6_in_error);
530 goto freeit;
531 }
532 }
533
534 ip6 = mtod(m, struct ip6_hdr *);
535 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
536 if (icmp6 == NULL) {
537 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
538 icmp6_ifstat_inc(rcvif, ifs6_in_error);
539 goto freeit;
540 }
541
542 /*
543 * Enforce alignment requirements that are violated in
544 * some cases, see kern/50766 for details.
545 */
546 if (ACCESSIBLE_POINTER(icmp6, struct ip6_hdr) == 0) {
547 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0);
548 if (m == NULL) {
549 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
550 icmp6_ifstat_inc(rcvif, ifs6_in_error);
551 goto freeit;
552 }
553 ip6 = mtod(m, struct ip6_hdr *);
554 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off);
555 }
556 KASSERT(ACCESSIBLE_POINTER(icmp6, struct ip6_hdr));
557
558 /*
559 * calculate the checksum
560 */
561 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
562 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n",
563 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src));
564 ICMP6_STATINC(ICMP6_STAT_CHECKSUM);
565 icmp6_ifstat_inc(rcvif, ifs6_in_error);
566 goto freeit;
567 }
568
569 #if defined(NFAITH) && 0 < NFAITH
570 if (faithprefix(&ip6->ip6_dst)) {
571 /*
572 * Deliver very specific ICMP6 type only.
573 * This is important to deliver TOOBIG. Otherwise PMTUD
574 * will not work.
575 */
576 switch (icmp6->icmp6_type) {
577 case ICMP6_DST_UNREACH:
578 case ICMP6_PACKET_TOO_BIG:
579 case ICMP6_TIME_EXCEEDED:
580 break;
581 default:
582 goto freeit;
583 }
584 }
585 #endif
586
587 code = icmp6->icmp6_code;
588 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type);
589
590 switch (icmp6->icmp6_type) {
591 case ICMP6_DST_UNREACH:
592 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach);
593 switch (code) {
594 case ICMP6_DST_UNREACH_NOROUTE:
595 code = PRC_UNREACH_NET;
596 break;
597 case ICMP6_DST_UNREACH_ADMIN:
598 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib);
599 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
600 break;
601 case ICMP6_DST_UNREACH_ADDR:
602 code = PRC_HOSTDEAD;
603 break;
604 case ICMP6_DST_UNREACH_BEYONDSCOPE:
605 /* I mean "source address was incorrect." */
606 code = PRC_UNREACH_NET;
607 break;
608 case ICMP6_DST_UNREACH_NOPORT:
609 code = PRC_UNREACH_PORT;
610 break;
611 default:
612 goto badcode;
613 }
614 goto deliver;
615
616 case ICMP6_PACKET_TOO_BIG:
617 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig);
618
619 /*
620 * MTU is checked in icmp6_mtudisc.
621 */
622 code = PRC_MSGSIZE;
623
624 /*
625 * Updating the path MTU will be done after examining
626 * intermediate extension headers.
627 */
628 goto deliver;
629
630 case ICMP6_TIME_EXCEEDED:
631 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed);
632 switch (code) {
633 case ICMP6_TIME_EXCEED_TRANSIT:
634 code = PRC_TIMXCEED_INTRANS;
635 break;
636 case ICMP6_TIME_EXCEED_REASSEMBLY:
637 code = PRC_TIMXCEED_REASS;
638 break;
639 default:
640 goto badcode;
641 }
642 goto deliver;
643
644 case ICMP6_PARAM_PROB:
645 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob);
646 switch (code) {
647 case ICMP6_PARAMPROB_NEXTHEADER:
648 code = PRC_UNREACH_PROTOCOL;
649 break;
650 case ICMP6_PARAMPROB_HEADER:
651 case ICMP6_PARAMPROB_OPTION:
652 code = PRC_PARAMPROB;
653 break;
654 default:
655 goto badcode;
656 }
657 goto deliver;
658
659 case ICMP6_ECHO_REQUEST:
660 icmp6_ifstat_inc(rcvif, ifs6_in_echo);
661 if (code != 0)
662 goto badcode;
663 /*
664 * Copy mbuf to send to two data paths: userland socket(s),
665 * and to the querier (echo reply).
666 * m: a copy for socket, n: a copy for querier
667 *
668 * If the first mbuf is shared, or the first mbuf is too short,
669 * copy the first part of the data into a fresh mbuf.
670 * Otherwise, we will wrongly overwrite both copies.
671 */
672 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
673 /* Give up local */
674 n = m;
675 m = NULL;
676 } else if (M_UNWRITABLE(n, off + sizeof(struct icmp6_hdr))) {
677 struct mbuf *n0 = n;
678
679 /*
680 * Prepare an internal mbuf. m_pullup() doesn't
681 * always copy the length we specified.
682 */
683 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
684 /* Give up local */
685 n = m;
686 m = NULL;
687 }
688 m_freem(n0);
689 }
690 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
691 sizeof(*nicmp6));
692 if (nicmp6 == NULL)
693 goto freeit;
694 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
695 nicmp6->icmp6_code = 0;
696 if (n) {
697 uint64_t *icmp6s = ICMP6_STAT_GETREF();
698 icmp6s[ICMP6_STAT_REFLECT]++;
699 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++;
700 ICMP6_STAT_PUTREF();
701 icmp6_reflect(n, off);
702 }
703 if (!m)
704 goto freeit;
705 break;
706
707 case ICMP6_ECHO_REPLY:
708 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply);
709 if (code != 0)
710 goto badcode;
711 break;
712
713 case MLD_LISTENER_QUERY:
714 case MLD_LISTENER_REPORT:
715 if (icmp6len < sizeof(struct mld_hdr))
716 goto badlen;
717 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
718 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery);
719 else
720 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport);
721 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
722 /* give up local */
723 mld_input(m, off);
724 m = NULL;
725 goto freeit;
726 }
727 mld_input(n, off);
728 /* m stays. */
729 break;
730
731 case MLD_LISTENER_DONE:
732 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone);
733 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
734 goto badlen;
735 break; /* nothing to be done in kernel */
736
737 case MLD_MTRACE_RESP:
738 case MLD_MTRACE:
739 /* XXX: these two are experimental. not officially defined. */
740 /* XXX: per-interface statistics? */
741 break; /* just pass it to applications */
742
743 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
744 {
745 enum { WRU, FQDN } mode;
746
747 if (!icmp6_nodeinfo)
748 break;
749
750 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
751 mode = WRU;
752 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
753 mode = FQDN;
754 else
755 goto badlen;
756
757 if (mode == FQDN) {
758 n = m_copypacket(m, M_DONTWAIT);
759 if (n)
760 n = ni6_input(n, off);
761 } else {
762 u_char *p;
763 int maxhlen;
764
765 if ((icmp6_nodeinfo & 5) != 5)
766 break;
767
768 if (code != 0)
769 goto badcode;
770 MGETHDR(n, M_DONTWAIT, m->m_type);
771 if (n && ICMP6_MAXLEN > MHLEN) {
772 MCLGET(n, M_DONTWAIT);
773 if ((n->m_flags & M_EXT) == 0) {
774 m_free(n);
775 n = NULL;
776 }
777 }
778 if (n == NULL) {
779 /* Give up remote */
780 break;
781 }
782 m_reset_rcvif(n);
783 n->m_len = 0;
784 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN;
785 if (maxhlen < 0) {
786 m_free(n);
787 break;
788 }
789 if (maxhlen > hostnamelen)
790 maxhlen = hostnamelen;
791 /*
792 * Copy IPv6 and ICMPv6 only.
793 */
794 nip6 = mtod(n, struct ip6_hdr *);
795 memcpy(nip6, ip6, sizeof(struct ip6_hdr));
796 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
797 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr));
798
799 p = (u_char *)(nicmp6 + 1);
800 memset(p, 0, 4);
801 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */
802
803 m_copy_pkthdr(n, m);
804 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
805 sizeof(struct icmp6_hdr) + 4 + maxhlen;
806 nicmp6->icmp6_type = ICMP6_WRUREPLY;
807 nicmp6->icmp6_code = 0;
808 }
809 if (n) {
810 uint64_t *icmp6s = ICMP6_STAT_GETREF();
811 icmp6s[ICMP6_STAT_REFLECT]++;
812 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++;
813 ICMP6_STAT_PUTREF();
814 icmp6_reflect(n, sizeof(struct ip6_hdr));
815 }
816 break;
817 }
818
819 case ICMP6_WRUREPLY:
820 if (code != 0)
821 goto badcode;
822 break;
823
824 case ND_ROUTER_SOLICIT:
825 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit);
826 /* FALLTHROUGH */
827 case ND_ROUTER_ADVERT:
828 if (icmp6->icmp6_type == ND_ROUTER_ADVERT)
829 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert);
830 if (code != 0)
831 goto badcode;
832 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT &&
833 icmp6len < sizeof(struct nd_router_solicit)) ||
834 (icmp6->icmp6_type == ND_ROUTER_ADVERT &&
835 icmp6len < sizeof(struct nd_router_advert)))
836 goto badlen;
837 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
838 /* give up local */
839 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type);
840 m = NULL;
841 goto freeit;
842 }
843 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type);
844 /* m stays. */
845 break;
846
847 case ND_NEIGHBOR_SOLICIT:
848 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit);
849 if (code != 0)
850 goto badcode;
851 if (icmp6len < sizeof(struct nd_neighbor_solicit))
852 goto badlen;
853 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
854 /* give up local */
855 nd6_ns_input(m, off, icmp6len);
856 m = NULL;
857 goto freeit;
858 }
859 nd6_ns_input(n, off, icmp6len);
860 /* m stays. */
861 break;
862
863 case ND_NEIGHBOR_ADVERT:
864 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert);
865 if (code != 0)
866 goto badcode;
867 if (icmp6len < sizeof(struct nd_neighbor_advert))
868 goto badlen;
869 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
870 /* give up local */
871 nd6_na_input(m, off, icmp6len);
872 m = NULL;
873 goto freeit;
874 }
875 nd6_na_input(n, off, icmp6len);
876 /* m stays. */
877 break;
878
879 case ND_REDIRECT:
880 icmp6_ifstat_inc(rcvif, ifs6_in_redirect);
881 if (code != 0)
882 goto badcode;
883 if (icmp6len < sizeof(struct nd_redirect))
884 goto badlen;
885 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
886 /* give up local */
887 icmp6_redirect_input(m, off);
888 m = NULL;
889 goto freeit;
890 }
891 icmp6_redirect_input(n, off);
892 /* m stays. */
893 break;
894
895 case ICMP6_ROUTER_RENUMBERING:
896 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
897 code != ICMP6_ROUTER_RENUMBERING_RESULT)
898 goto badcode;
899 if (icmp6len < sizeof(struct icmp6_router_renum))
900 goto badlen;
901 break;
902
903 default:
904 nd6log(LOG_DEBUG,
905 "unknown type %d(src=%s, dst=%s, ifid=%d)\n",
906 icmp6->icmp6_type,
907 IN6_PRINT(ip6buf, &ip6->ip6_src),
908 IN6_PRINT(ip6buf2, &ip6->ip6_dst),
909 rcvif ? rcvif->if_index : 0);
910 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
911 /* ICMPv6 error: MUST deliver it by spec... */
912 code = PRC_NCMDS;
913 /* deliver */
914 } else {
915 /* ICMPv6 informational: MUST not deliver */
916 break;
917 }
918 deliver:
919 if (icmp6_notify_error(m, off, icmp6len, code)) {
920 /* In this case, m should've been freed. */
921 m_put_rcvif_psref(rcvif, &psref);
922 return;
923 }
924 break;
925
926 badcode:
927 ICMP6_STATINC(ICMP6_STAT_BADCODE);
928 break;
929
930 badlen:
931 ICMP6_STATINC(ICMP6_STAT_BADLEN);
932 break;
933 }
934 m_put_rcvif_psref(rcvif, &psref);
935
936 /* deliver the packet to appropriate sockets */
937 icmp6_rip6_input(&m, off);
938
939 return;
940
941 freeit:
942 m_put_rcvif_psref(rcvif, &psref);
943 m_freem(m);
944 return;
945 }
946
947 int
icmp6_input(struct mbuf ** mp,int * offp,int proto)948 icmp6_input(struct mbuf **mp, int *offp, int proto)
949 {
950
951 wqinput_input(icmp6_wqinput, *mp, *offp, proto);
952
953 return IPPROTO_DONE;
954 }
955
956 static int
icmp6_notify_error(struct mbuf * m,int off,int icmp6len,int code)957 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
958 {
959 struct icmp6_hdr *icmp6;
960 struct ip6_hdr *eip6;
961 u_int32_t notifymtu;
962 struct sockaddr_in6 icmp6src, icmp6dst;
963
964 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
965 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
966 goto freeit;
967 }
968 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
969 sizeof(*icmp6) + sizeof(struct ip6_hdr));
970 if (icmp6 == NULL) {
971 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
972 return (-1);
973 }
974 eip6 = (struct ip6_hdr *)(icmp6 + 1);
975
976 /* Detect the upper level protocol */
977 {
978 void *(*ctlfunc)(int, const struct sockaddr *, void *);
979 u_int8_t nxt = eip6->ip6_nxt;
980 int eoff = off + sizeof(struct icmp6_hdr) +
981 sizeof(struct ip6_hdr);
982 struct ip6ctlparam ip6cp;
983 struct in6_addr *finaldst = NULL;
984 int icmp6type = icmp6->icmp6_type;
985 struct ip6_frag *fh;
986 struct ip6_rthdr *rth;
987 struct ifnet *rcvif;
988 int s;
989
990 while (1) { /* XXX: should avoid infinite loop explicitly? */
991 struct ip6_ext *eh;
992
993 switch (nxt) {
994 case IPPROTO_HOPOPTS:
995 case IPPROTO_DSTOPTS:
996 case IPPROTO_AH:
997 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
998 eoff, sizeof(*eh));
999 if (eh == NULL) {
1000 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1001 return (-1);
1002 }
1003
1004 if (nxt == IPPROTO_AH)
1005 eoff += (eh->ip6e_len + 2) << 2;
1006 else
1007 eoff += (eh->ip6e_len + 1) << 3;
1008 nxt = eh->ip6e_nxt;
1009 break;
1010 case IPPROTO_ROUTING:
1011 /* Ignore the option. */
1012 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
1013 eoff, sizeof(*rth));
1014 if (rth == NULL) {
1015 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1016 return (-1);
1017 }
1018
1019 eoff += (rth->ip6r_len + 1) << 3;
1020 nxt = rth->ip6r_nxt;
1021 break;
1022 case IPPROTO_FRAGMENT:
1023 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1024 eoff, sizeof(*fh));
1025 if (fh == NULL) {
1026 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1027 return (-1);
1028 }
1029 /*
1030 * Data after a fragment header is meaningless
1031 * unless it is the first fragment, but
1032 * we'll go to the notify label for path MTU
1033 * discovery.
1034 */
1035 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1036 goto notify;
1037
1038 eoff += sizeof(struct ip6_frag);
1039 nxt = fh->ip6f_nxt;
1040 break;
1041 default:
1042 /*
1043 * This case includes ESP and the No Next
1044 * Header. In such cases going to the notify
1045 * label does not have any meaning
1046 * (i.e. ctlfunc will be NULL), but we go
1047 * anyway since we might have to update
1048 * path MTU information.
1049 */
1050 goto notify;
1051 }
1052 }
1053 notify:
1054 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1055 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1056 if (icmp6 == NULL) {
1057 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1058 return (-1);
1059 }
1060
1061 /*
1062 * retrieve parameters from the inner IPv6 header, and convert
1063 * them into sockaddr structures.
1064 * XXX: there is no guarantee that the source or destination
1065 * addresses of the inner packet are in the same scope zone as
1066 * the addresses of the icmp packet. But there is no other
1067 * way to determine the zone.
1068 */
1069 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1070
1071 rcvif = m_get_rcvif(m, &s);
1072 if (__predict_false(rcvif == NULL))
1073 goto freeit;
1074 sockaddr_in6_init(&icmp6dst,
1075 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0);
1076 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) {
1077 m_put_rcvif(rcvif, &s);
1078 goto freeit;
1079 }
1080 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0);
1081 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) {
1082 m_put_rcvif(rcvif, &s);
1083 goto freeit;
1084 }
1085 m_put_rcvif(rcvif, &s);
1086
1087 icmp6src.sin6_flowinfo =
1088 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1089
1090 if (finaldst == NULL)
1091 finaldst = &eip6->ip6_dst;
1092 ip6cp.ip6c_m = m;
1093 ip6cp.ip6c_icmp6 = icmp6;
1094 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1095 ip6cp.ip6c_off = eoff;
1096 ip6cp.ip6c_finaldst = finaldst;
1097 ip6cp.ip6c_src = &icmp6src;
1098 ip6cp.ip6c_nxt = nxt;
1099
1100 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1101 notifymtu = ntohl(icmp6->icmp6_mtu);
1102 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1103 }
1104
1105 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput;
1106 if (ctlfunc) {
1107 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp);
1108 }
1109 }
1110 return (0);
1111
1112 freeit:
1113 m_freem(m);
1114 return (-1);
1115 }
1116
1117 void
icmp6_mtudisc_update(struct ip6ctlparam * ip6cp,int validated)1118 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1119 {
1120 unsigned long rtcount;
1121 struct icmp6_mtudisc_callback *mc;
1122 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1123 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1124 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1125 u_int mtu = ntohl(icmp6->icmp6_mtu);
1126 struct rtentry *rt = NULL;
1127 struct sockaddr_in6 sin6;
1128 struct ifnet *rcvif;
1129 int s;
1130
1131 /*
1132 * The MTU should not be less than the minimal IPv6 MTU except for the
1133 * hack in ip6_output/ip6_setpmtu where we always include a frag header.
1134 * In that one case, the MTU might be less than 1280.
1135 */
1136 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) {
1137 /* is the mtu even sane? */
1138 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1139 return;
1140 if (!validated)
1141 return;
1142 mtu = IPV6_MMTU - sizeof(struct ip6_frag);
1143 }
1144
1145 /*
1146 * allow non-validated cases if memory is plenty, to make traffic
1147 * from non-connected pcb happy.
1148 */
1149 mutex_enter(&icmp6_mtx);
1150 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
1151 if (validated) {
1152 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) {
1153 mutex_exit(&icmp6_mtx);
1154 return;
1155 } else if (0 <= icmp6_mtudisc_lowat &&
1156 rtcount > icmp6_mtudisc_lowat) {
1157 /*
1158 * XXX nuke a victim, install the new one.
1159 */
1160 }
1161 } else {
1162 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) {
1163 mutex_exit(&icmp6_mtx);
1164 return;
1165 }
1166 }
1167 mutex_exit(&icmp6_mtx);
1168
1169 memset(&sin6, 0, sizeof(sin6));
1170 sin6.sin6_family = PF_INET6;
1171 sin6.sin6_len = sizeof(struct sockaddr_in6);
1172 sin6.sin6_addr = *dst;
1173 rcvif = m_get_rcvif(m, &s);
1174 if (__predict_false(rcvif == NULL))
1175 return;
1176 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) {
1177 m_put_rcvif(rcvif, &s);
1178 return;
1179 }
1180 m_put_rcvif(rcvif, &s);
1181
1182 rt = icmp6_mtudisc_clone(sin6tosa(&sin6));
1183
1184 if (rt && (rt->rt_flags & RTF_HOST) &&
1185 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1186 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) {
1187 if (mtu < rt->rt_ifp->if_mtu) {
1188 ICMP6_STATINC(ICMP6_STAT_PMTUCHG);
1189 rt->rt_rmx.rmx_mtu = mtu;
1190 }
1191 }
1192 if (rt) {
1193 rt_unref(rt);
1194 }
1195
1196 /*
1197 * Notify protocols that the MTU for this destination
1198 * has changed.
1199 */
1200 mutex_enter(&icmp6_mtx);
1201 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
1202 mc = LIST_NEXT(mc, mc_list))
1203 (*mc->mc_func)(&sin6.sin6_addr);
1204 mutex_exit(&icmp6_mtx);
1205 }
1206
1207 /*
1208 * Process a Node Information Query packet, based on
1209 * draft-ietf-ipngwg-icmp-name-lookups-07.
1210 *
1211 * Spec incompatibilities:
1212 * - IPv6 Subject address handling
1213 * - IPv4 Subject address handling support missing
1214 * - Proxy reply (answer even if it's not for me)
1215 * - joins NI group address at in6_ifattach() time only, does not cope
1216 * with hostname changes by sethostname(3)
1217 */
1218 static struct mbuf *
ni6_input(struct mbuf * m,int off)1219 ni6_input(struct mbuf *m, int off)
1220 {
1221 struct icmp6_nodeinfo *ni6, *nni6;
1222 struct mbuf *n = NULL;
1223 u_int16_t qtype;
1224 int subjlen;
1225 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1226 struct ni_reply_fqdn *fqdn;
1227 int addrs; /* for NI_QTYPE_NODEADDR */
1228 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1229 struct sockaddr_in6 sin6; /* ip6_dst */
1230 struct in6_addr in6_subj; /* subject address */
1231 struct ip6_hdr *ip6;
1232 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1233 char *subj = NULL;
1234 struct ifnet *rcvif;
1235 int s, ss;
1236 struct ifaddr *ifa;
1237 struct psref psref;
1238
1239 ip6 = mtod(m, struct ip6_hdr *);
1240 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1241 if (ni6 == NULL) {
1242 /* m is already reclaimed */
1243 return NULL;
1244 }
1245 KASSERT((m->m_flags & M_PKTHDR) != 0);
1246
1247 /*
1248 * Validate IPv6 destination address.
1249 *
1250 * The Responder must discard the Query without further processing
1251 * unless it is one of the Responder's unicast or anycast addresses, or
1252 * a link-local scope multicast address which the Responder has joined.
1253 * [icmp-name-lookups-07, Section 4.]
1254 */
1255 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
1256 /* XXX scopeid */
1257 ss = pserialize_read_enter();
1258 ifa = ifa_ifwithaddr(sin6tosa(&sin6));
1259 if (ifa != NULL) {
1260 ; /* unicast/anycast, fine */
1261 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) {
1262 ; /* link-local multicast, fine */
1263 } else {
1264 pserialize_read_exit(ss);
1265 goto bad;
1266 }
1267 pserialize_read_exit(ss);
1268
1269 /* validate query Subject field. */
1270 qtype = ntohs(ni6->ni_qtype);
1271 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1272 switch (qtype) {
1273 case NI_QTYPE_NOOP:
1274 case NI_QTYPE_SUPTYPES:
1275 /* 07 draft */
1276 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1277 break;
1278 /* FALLTHROUGH */
1279 case NI_QTYPE_FQDN:
1280 case NI_QTYPE_NODEADDR:
1281 case NI_QTYPE_IPV4ADDR:
1282 switch (ni6->ni_code) {
1283 case ICMP6_NI_SUBJ_IPV6:
1284 #if ICMP6_NI_SUBJ_IPV6 != 0
1285 case 0:
1286 #endif
1287 /*
1288 * backward compatibility - try to accept 03 draft
1289 * format, where no Subject is present.
1290 */
1291 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1292 subjlen == 0) {
1293 oldfqdn++;
1294 break;
1295 }
1296 #if ICMP6_NI_SUBJ_IPV6 != 0
1297 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1298 goto bad;
1299 #endif
1300
1301 if (subjlen != sizeof(sin6.sin6_addr))
1302 goto bad;
1303
1304 /*
1305 * Validate Subject address.
1306 *
1307 * Not sure what exactly "address belongs to the node"
1308 * means in the spec, is it just unicast, or what?
1309 *
1310 * At this moment we consider Subject address as
1311 * "belong to the node" if the Subject address equals
1312 * to the IPv6 destination address; validation for
1313 * IPv6 destination address should have done enough
1314 * check for us.
1315 *
1316 * We do not do proxy at this moment.
1317 */
1318 /* m_pulldown instead of copy? */
1319 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1320 subjlen, (void *)&in6_subj);
1321 rcvif = m_get_rcvif(m, &s);
1322 if (__predict_false(rcvif == NULL))
1323 goto bad;
1324 if (in6_setscope(&in6_subj, rcvif, NULL)) {
1325 m_put_rcvif(rcvif, &s);
1326 goto bad;
1327 }
1328 m_put_rcvif(rcvif, &s);
1329
1330 subj = (char *)&in6_subj;
1331 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1332 break;
1333
1334 /*
1335 * XXX if we are to allow other cases, we should really
1336 * be careful about scope here.
1337 * basically, we should disallow queries toward IPv6
1338 * destination X with subject Y, if scope(X) > scope(Y).
1339 * if we allow scope(X) > scope(Y), it will result in
1340 * information leakage across scope boundary.
1341 */
1342 goto bad;
1343
1344 case ICMP6_NI_SUBJ_FQDN:
1345 /*
1346 * Validate Subject name with gethostname(3).
1347 *
1348 * The behavior may need some debate, since:
1349 * - we are not sure if the node has FQDN as
1350 * hostname (returned by gethostname(3)).
1351 * - the code does wildcard match for truncated names.
1352 * however, we are not sure if we want to perform
1353 * wildcard match, if gethostname(3) side has
1354 * truncated hostname.
1355 */
1356 n = ni6_nametodns(hostname, hostnamelen, 0);
1357 if (!n || n->m_next || n->m_len == 0)
1358 goto bad;
1359 IP6_EXTHDR_GET(subj, char *, m,
1360 off + sizeof(struct icmp6_nodeinfo), subjlen);
1361 if (subj == NULL)
1362 goto bad;
1363 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1364 n->m_len)) {
1365 goto bad;
1366 }
1367 m_freem(n);
1368 n = NULL;
1369 break;
1370
1371 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1372 default:
1373 goto bad;
1374 }
1375 break;
1376 }
1377
1378 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1379 switch (qtype) {
1380 case NI_QTYPE_FQDN:
1381 if ((icmp6_nodeinfo & 1) == 0)
1382 goto bad;
1383 break;
1384 case NI_QTYPE_NODEADDR:
1385 case NI_QTYPE_IPV4ADDR:
1386 if ((icmp6_nodeinfo & 2) == 0)
1387 goto bad;
1388 break;
1389 }
1390
1391 /* guess reply length */
1392 switch (qtype) {
1393 case NI_QTYPE_NOOP:
1394 break; /* no reply data */
1395 case NI_QTYPE_SUPTYPES:
1396 replylen += sizeof(u_int32_t);
1397 break;
1398 case NI_QTYPE_FQDN:
1399 /* will append an mbuf */
1400 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1401 break;
1402 case NI_QTYPE_NODEADDR:
1403 addrs = ni6_addrs(ni6, &ifp, subj, &psref);
1404 replylen += addrs *
1405 (sizeof(struct in6_addr) + sizeof(u_int32_t));
1406 if (replylen > MCLBYTES)
1407 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1408 break;
1409 case NI_QTYPE_IPV4ADDR:
1410 /* unsupported - should respond with unknown Qtype? */
1411 goto bad;
1412 default:
1413 /*
1414 * XXX: We must return a reply with the ICMP6 code
1415 * `unknown Qtype' in this case. However we regard the case
1416 * as an FQDN query for backward compatibility.
1417 * Older versions set a random value to this field,
1418 * so it rarely varies in the defined qtypes.
1419 * But the mechanism is not reliable...
1420 * maybe we should obsolete older versions.
1421 */
1422 qtype = NI_QTYPE_FQDN;
1423 /* will append an mbuf */
1424 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1425 oldfqdn++;
1426 break;
1427 }
1428
1429 /* allocate an mbuf to reply. */
1430 MGETHDR(n, M_DONTWAIT, m->m_type);
1431 if (n == NULL) {
1432 goto bad;
1433 }
1434 m_move_pkthdr(n, m);
1435 if (replylen > MHLEN) {
1436 if (replylen > MCLBYTES) {
1437 /*
1438 * XXX: should we try to allocate more? But MCLBYTES
1439 * is probably much larger than IPV6_MMTU...
1440 */
1441 goto bad;
1442 }
1443 MCLGET(n, M_DONTWAIT);
1444 if ((n->m_flags & M_EXT) == 0) {
1445 goto bad;
1446 }
1447 }
1448 n->m_pkthdr.len = n->m_len = replylen;
1449
1450 /* copy mbuf header and IPv6 + Node Information base headers */
1451 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr));
1452 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1453 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo));
1454
1455 /* qtype dependent procedure */
1456 switch (qtype) {
1457 case NI_QTYPE_NOOP:
1458 nni6->ni_code = ICMP6_NI_SUCCESS;
1459 nni6->ni_flags = 0;
1460 break;
1461 case NI_QTYPE_SUPTYPES:
1462 {
1463 u_int32_t v;
1464 nni6->ni_code = ICMP6_NI_SUCCESS;
1465 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1466 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1467 v = (u_int32_t)htonl(0x0000000f);
1468 memcpy(nni6 + 1, &v, sizeof(u_int32_t));
1469 break;
1470 }
1471 case NI_QTYPE_FQDN:
1472 nni6->ni_code = ICMP6_NI_SUCCESS;
1473 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) +
1474 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1475 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1476 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1477 /*
1478 * XXX do we really have FQDN in variable "hostname"?
1479 */
1480 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1481 if (n->m_next == NULL)
1482 goto bad;
1483 /* XXX we assume that n->m_next is not a chain */
1484 if (n->m_next->m_next != NULL)
1485 goto bad;
1486 n->m_pkthdr.len += n->m_next->m_len;
1487 break;
1488 case NI_QTYPE_NODEADDR:
1489 {
1490 int lenlim, copied;
1491
1492 nni6->ni_code = ICMP6_NI_SUCCESS;
1493 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1494 sizeof(struct icmp6_nodeinfo);
1495 lenlim = M_TRAILINGSPACE(n);
1496 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1497 if_put(ifp, &psref);
1498 ifp = NULL;
1499 /* update mbuf length */
1500 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1501 sizeof(struct icmp6_nodeinfo) + copied;
1502 break;
1503 }
1504 default:
1505 panic("%s: impossible", __func__);
1506 break;
1507 }
1508
1509 nni6->ni_type = ICMP6_NI_REPLY;
1510 m_freem(m);
1511 return n;
1512
1513 bad:
1514 if_put(ifp, &psref);
1515 m_freem(m);
1516 if (n)
1517 m_freem(n);
1518 return NULL;
1519 }
1520
1521 #define isupper(x) ('A' <= (x) && (x) <= 'Z')
1522 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
1523 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9'))
1524 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x))
1525
1526 /*
1527 * make a mbuf with DNS-encoded string. no compression support.
1528 *
1529 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1530 * treated as truncated name (two \0 at the end). this is a wild guess.
1531 *
1532 * old - return pascal string if non-zero
1533 */
1534 static struct mbuf *
ni6_nametodns(const char * name,int namelen,int old)1535 ni6_nametodns(const char *name, int namelen, int old)
1536 {
1537 struct mbuf *m;
1538 char *cp, *ep;
1539 const char *p, *q;
1540 int i, len, nterm;
1541
1542 if (old)
1543 len = namelen + 1;
1544 else
1545 len = MCLBYTES;
1546
1547 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1548 MGET(m, M_DONTWAIT, MT_DATA);
1549 if (m && len > MLEN) {
1550 MCLGET(m, M_DONTWAIT);
1551 if ((m->m_flags & M_EXT) == 0)
1552 goto fail;
1553 }
1554 if (!m)
1555 goto fail;
1556 m->m_next = NULL;
1557
1558 if (old) {
1559 m->m_len = len;
1560 *mtod(m, char *) = namelen;
1561 memcpy(mtod(m, char *) + 1, name, namelen);
1562 return m;
1563 } else {
1564 m->m_len = 0;
1565 cp = mtod(m, char *);
1566 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1567
1568 /* if not certain about my name, return empty buffer */
1569 if (namelen == 0)
1570 return m;
1571
1572 /*
1573 * guess if it looks like shortened hostname, or FQDN.
1574 * shortened hostname needs two trailing "\0".
1575 */
1576 i = 0;
1577 for (p = name; p < name + namelen; p++) {
1578 if (*p == '.')
1579 i++;
1580 }
1581 if (i < 2)
1582 nterm = 2;
1583 else
1584 nterm = 1;
1585
1586 p = name;
1587 while (cp < ep && p < name + namelen) {
1588 i = 0;
1589 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1590 i++;
1591 /* result does not fit into mbuf */
1592 if (cp + i + 1 >= ep)
1593 goto fail;
1594 /*
1595 * DNS label length restriction, RFC1035 page 8.
1596 * "i == 0" case is included here to avoid returning
1597 * 0-length label on "foo..bar".
1598 */
1599 if (i <= 0 || i >= 64)
1600 goto fail;
1601 *cp++ = i;
1602 if (!isalpha(p[0]) || !isalnum(p[i - 1]))
1603 goto fail;
1604 while (i > 0) {
1605 if (!isalnum(*p) && *p != '-')
1606 goto fail;
1607 if (isupper(*p)) {
1608 *cp++ = tolower(*p);
1609 p++;
1610 } else
1611 *cp++ = *p++;
1612 i--;
1613 }
1614 p = q;
1615 if (p < name + namelen && *p == '.')
1616 p++;
1617 }
1618 /* termination */
1619 if (cp + nterm >= ep)
1620 goto fail;
1621 while (nterm-- > 0)
1622 *cp++ = '\0';
1623 m->m_len = cp - mtod(m, char *);
1624 return m;
1625 }
1626
1627 panic("should not reach here");
1628 /* NOTREACHED */
1629
1630 fail:
1631 if (m)
1632 m_freem(m);
1633 return NULL;
1634 }
1635
1636 /*
1637 * check if two DNS-encoded string matches. takes care of truncated
1638 * form (with \0\0 at the end). no compression support.
1639 * XXX upper/lowercase match (see RFC2065)
1640 */
1641 static int
ni6_dnsmatch(const char * a,int alen,const char * b,int blen)1642 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1643 {
1644 const char *a0, *b0;
1645 int l;
1646
1647 /* simplest case - need validation? */
1648 if (alen == blen && memcmp(a, b, alen) == 0)
1649 return 1;
1650
1651 a0 = a;
1652 b0 = b;
1653
1654 /* termination is mandatory */
1655 if (alen < 2 || blen < 2)
1656 return 0;
1657 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1658 return 0;
1659 alen--;
1660 blen--;
1661
1662 while (a - a0 < alen && b - b0 < blen) {
1663 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1664 return 0;
1665
1666 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1667 return 0;
1668 /* we don't support compression yet */
1669 if (a[0] >= 64 || b[0] >= 64)
1670 return 0;
1671
1672 /* truncated case */
1673 if (a[0] == 0 && a - a0 == alen - 1)
1674 return 1;
1675 if (b[0] == 0 && b - b0 == blen - 1)
1676 return 1;
1677 if (a[0] == 0 || b[0] == 0)
1678 return 0;
1679
1680 if (a[0] != b[0])
1681 return 0;
1682 l = a[0];
1683 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1684 return 0;
1685 if (memcmp(a + 1, b + 1, l) != 0)
1686 return 0;
1687
1688 a += 1 + l;
1689 b += 1 + l;
1690 }
1691
1692 if (a - a0 == alen && b - b0 == blen)
1693 return 1;
1694 else
1695 return 0;
1696 }
1697
1698 /*
1699 * calculate the number of addresses to be returned in the node info reply.
1700 */
1701 static int
ni6_addrs(struct icmp6_nodeinfo * ni6,struct ifnet ** ifpp,char * subj,struct psref * psref)1702 ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj,
1703 struct psref *psref)
1704 {
1705 struct ifnet *ifp;
1706 struct in6_ifaddr *ia6;
1707 struct ifaddr *ifa;
1708 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1709 int addrs = 0, addrsofif, iffound = 0;
1710 int niflags = ni6->ni_flags;
1711 int s;
1712
1713 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1714 switch (ni6->ni_code) {
1715 case ICMP6_NI_SUBJ_IPV6:
1716 if (subj == NULL) /* must be impossible... */
1717 return 0;
1718 subj_ip6 = (struct sockaddr_in6 *)subj;
1719 break;
1720 default:
1721 /*
1722 * XXX: we only support IPv6 subject address for
1723 * this Qtype.
1724 */
1725 return 0;
1726 }
1727 }
1728
1729 s = pserialize_read_enter();
1730 IFNET_READER_FOREACH(ifp) {
1731 addrsofif = 0;
1732 IFADDR_READER_FOREACH(ifa, ifp) {
1733 if (ifa->ifa_addr->sa_family != AF_INET6)
1734 continue;
1735 ia6 = (struct in6_ifaddr *)ifa;
1736
1737 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1738 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1739 &ia6->ia_addr.sin6_addr))
1740 iffound = 1;
1741
1742 /*
1743 * IPv4-mapped addresses can only be returned by a
1744 * Node Information proxy, since they represent
1745 * addresses of IPv4-only nodes, which perforce do
1746 * not implement this protocol.
1747 * [icmp-name-lookups-07, Section 5.4]
1748 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1749 * this function at this moment.
1750 */
1751
1752 /* What do we have to do about ::1? */
1753 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
1754 case IPV6_ADDR_SCOPE_LINKLOCAL:
1755 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1756 continue;
1757 break;
1758 case IPV6_ADDR_SCOPE_SITELOCAL:
1759 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1760 continue;
1761 break;
1762 case IPV6_ADDR_SCOPE_GLOBAL:
1763 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1764 continue;
1765 break;
1766 default:
1767 continue;
1768 }
1769
1770 /*
1771 * check if anycast is okay.
1772 * XXX: just experimental. not in the spec.
1773 */
1774 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1775 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1776 continue; /* we need only unicast addresses */
1777
1778 addrsofif++; /* count the address */
1779 }
1780 if (iffound) {
1781 if_acquire(ifp, psref);
1782 pserialize_read_exit(s);
1783 *ifpp = ifp;
1784 return addrsofif;
1785 }
1786
1787 addrs += addrsofif;
1788 }
1789 pserialize_read_exit(s);
1790
1791 return addrs;
1792 }
1793
1794 static int
ni6_store_addrs(struct icmp6_nodeinfo * ni6,struct icmp6_nodeinfo * nni6,struct ifnet * ifp0,int resid)1795 ni6_store_addrs(struct icmp6_nodeinfo *ni6,
1796 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0,
1797 int resid)
1798 {
1799 struct ifnet *ifp;
1800 struct in6_ifaddr *ia6;
1801 struct ifaddr *ifa;
1802 struct ifnet *ifp_dep = NULL;
1803 int copied = 0, allow_deprecated = 0;
1804 u_char *cp = (u_char *)(nni6 + 1);
1805 int niflags = ni6->ni_flags;
1806 u_int32_t ltime;
1807 int s;
1808
1809 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1810 return 0; /* needless to copy */
1811
1812 s = pserialize_read_enter();
1813 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST();
1814 again:
1815
1816 for (; ifp; ifp = IFNET_READER_NEXT(ifp))
1817 {
1818 IFADDR_READER_FOREACH(ifa, ifp) {
1819 if (ifa->ifa_addr->sa_family != AF_INET6)
1820 continue;
1821 ia6 = (struct in6_ifaddr *)ifa;
1822
1823 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1824 allow_deprecated == 0) {
1825 /*
1826 * prefererred address should be put before
1827 * deprecated addresses.
1828 */
1829
1830 /* record the interface for later search */
1831 if (ifp_dep == NULL)
1832 ifp_dep = ifp;
1833
1834 continue;
1835 }
1836 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1837 allow_deprecated != 0)
1838 continue; /* we now collect deprecated addrs */
1839
1840 /* What do we have to do about ::1? */
1841 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) {
1842 case IPV6_ADDR_SCOPE_LINKLOCAL:
1843 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1844 continue;
1845 break;
1846 case IPV6_ADDR_SCOPE_SITELOCAL:
1847 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1848 continue;
1849 break;
1850 case IPV6_ADDR_SCOPE_GLOBAL:
1851 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1852 continue;
1853 break;
1854 default:
1855 continue;
1856 }
1857
1858 /*
1859 * check if anycast is okay.
1860 * XXX: just experimental. not in the spec.
1861 */
1862 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1863 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1864 continue;
1865
1866 /* now we can copy the address */
1867 if (resid < sizeof(struct in6_addr) +
1868 sizeof(u_int32_t)) {
1869 /*
1870 * We give up much more copy.
1871 * Set the truncate flag and return.
1872 */
1873 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1874 goto out;
1875 }
1876
1877 /*
1878 * Set the TTL of the address.
1879 * The TTL value should be one of the following
1880 * according to the specification:
1881 *
1882 * 1. The remaining lifetime of a DHCP lease on the
1883 * address, or
1884 * 2. The remaining Valid Lifetime of a prefix from
1885 * which the address was derived through Stateless
1886 * Autoconfiguration.
1887 *
1888 * Note that we currently do not support stateful
1889 * address configuration by DHCPv6, so the former
1890 * case can't happen.
1891 *
1892 * TTL must be 2^31 > TTL >= 0.
1893 */
1894 if (ia6->ia6_lifetime.ia6t_expire == 0)
1895 ltime = ND6_INFINITE_LIFETIME;
1896 else {
1897 if (ia6->ia6_lifetime.ia6t_expire >
1898 time_uptime)
1899 ltime = ia6->ia6_lifetime.ia6t_expire -
1900 time_uptime;
1901 else
1902 ltime = 0;
1903 }
1904 if (ltime > 0x7fffffff)
1905 ltime = 0x7fffffff;
1906 ltime = htonl(ltime);
1907
1908 memcpy(cp, <ime, sizeof(u_int32_t));
1909 cp += sizeof(u_int32_t);
1910
1911 /* copy the address itself */
1912 bcopy(&ia6->ia_addr.sin6_addr, cp,
1913 sizeof(struct in6_addr));
1914 in6_clearscope((struct in6_addr *)cp); /* XXX */
1915 cp += sizeof(struct in6_addr);
1916
1917 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1918 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1919 }
1920 if (ifp0) /* we need search only on the specified IF */
1921 break;
1922 }
1923
1924 if (allow_deprecated == 0 && ifp_dep != NULL) {
1925 ifp = ifp_dep;
1926 allow_deprecated = 1;
1927
1928 goto again;
1929 }
1930 out:
1931 pserialize_read_exit(s);
1932 return copied;
1933 }
1934
1935 /*
1936 * XXX almost dup'ed code with rip6_input.
1937 */
1938 static int
icmp6_rip6_input(struct mbuf ** mp,int off)1939 icmp6_rip6_input(struct mbuf **mp, int off)
1940 {
1941 struct mbuf *m = *mp;
1942 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1943 struct inpcb *inp;
1944 struct inpcb *last = NULL;
1945 struct sockaddr_in6 rip6src;
1946 struct icmp6_hdr *icmp6;
1947 struct mbuf *n, *opts = NULL;
1948
1949 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1950 if (icmp6 == NULL) {
1951 /* m is already reclaimed */
1952 return IPPROTO_DONE;
1953 }
1954
1955 /*
1956 * XXX: the address may have embedded scope zone ID, which should be
1957 * hidden from applications.
1958 */
1959 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0);
1960 if (sa6_recoverscope(&rip6src)) {
1961 m_freem(m);
1962 return IPPROTO_DONE;
1963 }
1964
1965 TAILQ_FOREACH(inp, &raw6cbtable.inpt_queue, inp_queue) {
1966 if (inp->inp_af != AF_INET6)
1967 continue;
1968 if (in6p_ip6(inp).ip6_nxt != IPPROTO_ICMPV6)
1969 continue;
1970 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_laddr(inp)) &&
1971 !IN6_ARE_ADDR_EQUAL(&in6p_laddr(inp), &ip6->ip6_dst))
1972 continue;
1973 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p_faddr(inp)) &&
1974 !IN6_ARE_ADDR_EQUAL(&in6p_faddr(inp), &ip6->ip6_src))
1975 continue;
1976 if (in6p_icmp6filt(inp) &&
1977 ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1978 in6p_icmp6filt(inp)))
1979 continue;
1980
1981 if (last == NULL) {
1982 ;
1983 }
1984 #ifdef IPSEC
1985 else if (ipsec_used && ipsec_in_reject(m, last)) {
1986 /* do not inject data into pcb */
1987 }
1988 #endif
1989 else if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) {
1990 if (last->inp_flags & IN6P_CONTROLOPTS)
1991 ip6_savecontrol(last, &opts, ip6, n);
1992 /* strip intermediate headers */
1993 m_adj(n, off);
1994 if (sbappendaddr(&last->inp_socket->so_rcv,
1995 sin6tosa(&rip6src), n, opts) == 0) {
1996 soroverflow(last->inp_socket);
1997 m_freem(n);
1998 if (opts)
1999 m_freem(opts);
2000 } else {
2001 sorwakeup(last->inp_socket);
2002 }
2003 opts = NULL;
2004 }
2005
2006 last = inp;
2007 }
2008
2009 #ifdef IPSEC
2010 if (ipsec_used && last && ipsec_in_reject(m, last)) {
2011 m_freem(m);
2012 IP6_STATDEC(IP6_STAT_DELIVERED);
2013 /* do not inject data into pcb */
2014 } else
2015 #endif
2016 if (last) {
2017 if (last->inp_flags & IN6P_CONTROLOPTS)
2018 ip6_savecontrol(last, &opts, ip6, m);
2019 /* strip intermediate headers */
2020 m_adj(m, off);
2021 if (sbappendaddr(&last->inp_socket->so_rcv,
2022 sin6tosa(&rip6src), m, opts) == 0) {
2023 soroverflow(last->inp_socket);
2024 m_freem(m);
2025 if (opts)
2026 m_freem(opts);
2027 } else {
2028 sorwakeup(last->inp_socket);
2029 }
2030 } else {
2031 m_freem(m);
2032 IP6_STATDEC(IP6_STAT_DELIVERED);
2033 }
2034 return IPPROTO_DONE;
2035 }
2036
2037 /*
2038 * Reflect the ip6 packet back to the source.
2039 * OFF points to the icmp6 header, counted from the top of the mbuf.
2040 *
2041 * Note: RFC 1885 required that an echo reply should be truncated if it
2042 * did not fit in with (return) path MTU, and KAME code supported the
2043 * behavior. However, as a clarification after the RFC, this limitation
2044 * was removed in a revised version of the spec, RFC 2463. We had kept the
2045 * old behavior, with a (non-default) ifdef block, while the new version of
2046 * the spec was an internet-draft status, and even after the new RFC was
2047 * published. But it would rather make sense to clean the obsoleted part
2048 * up, and to make the code simpler at this stage.
2049 */
2050 static void
icmp6_reflect(struct mbuf * m,size_t off)2051 icmp6_reflect(struct mbuf *m, size_t off)
2052 {
2053 struct ip6_hdr *ip6;
2054 struct icmp6_hdr *icmp6;
2055 const struct in6_ifaddr *ia;
2056 const struct ip6aux *ip6a;
2057 int plen;
2058 int type, code;
2059 struct ifnet *outif = NULL;
2060 struct in6_addr origdst;
2061 struct ifnet *rcvif;
2062 int s;
2063 bool ip6_src_filled = false;
2064 int flags;
2065
2066 /* too short to reflect */
2067 if (off < sizeof(struct ip6_hdr)) {
2068 nd6log(LOG_DEBUG,
2069 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2070 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2071 __FILE__, __LINE__);
2072 goto bad;
2073 }
2074
2075 /*
2076 * If there are extra headers between IPv6 and ICMPv6, strip
2077 * off that header first.
2078 */
2079 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN);
2080 if (off > sizeof(struct ip6_hdr)) {
2081 size_t l;
2082 struct ip6_hdr nip6;
2083
2084 l = off - sizeof(struct ip6_hdr);
2085 m_copydata(m, 0, sizeof(nip6), (void *)&nip6);
2086 m_adj(m, l);
2087 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2088 if (m->m_len < l) {
2089 if ((m = m_pullup(m, l)) == NULL)
2090 return;
2091 }
2092 memcpy(mtod(m, void *), (void *)&nip6, sizeof(nip6));
2093 } else {
2094 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2095 if (m->m_len < l) {
2096 if ((m = m_pullup(m, l)) == NULL)
2097 return;
2098 }
2099 }
2100
2101 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2102 ip6 = mtod(m, struct ip6_hdr *);
2103 ip6->ip6_nxt = IPPROTO_ICMPV6;
2104 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2105 type = icmp6->icmp6_type; /* keep type for statistics */
2106 code = icmp6->icmp6_code; /* ditto. */
2107
2108 origdst = ip6->ip6_dst;
2109 /*
2110 * ip6_input() drops a packet if its src is multicast.
2111 * So, the src is never multicast.
2112 */
2113 ip6->ip6_dst = ip6->ip6_src;
2114
2115 /*
2116 * If the incoming packet was addressed directly to us (i.e. unicast),
2117 * use dst as the src for the reply.
2118 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2119 * (for example) when we encounter an error while forwarding procedure
2120 * destined to a duplicated address of ours.
2121 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2122 * procedure of an outgoing packet of our own, in which case we need
2123 * to search in the ifaddr list.
2124 */
2125 if (IN6_IS_ADDR_MULTICAST(&origdst)) {
2126 ;
2127 } else if ((ip6a = ip6_getdstifaddr(m)) != NULL) {
2128 if ((ip6a->ip6a_flags &
2129 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2130 ip6->ip6_src = ip6a->ip6a_src;
2131 ip6_src_filled = true;
2132 }
2133 } else {
2134 union {
2135 struct sockaddr_in6 sin6;
2136 struct sockaddr sa;
2137 } u;
2138 int _s;
2139 struct ifaddr *ifa;
2140
2141 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0);
2142
2143 _s = pserialize_read_enter();
2144 ifa = ifa_ifwithaddr(&u.sa);
2145
2146 if (ifa != NULL) {
2147 ia = ifatoia6(ifa);
2148 if ((ia->ia6_flags &
2149 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2150 ip6->ip6_src = ia->ia_addr.sin6_addr;
2151 ip6_src_filled = true;
2152 }
2153 }
2154 pserialize_read_exit(_s);
2155 }
2156
2157 if (!ip6_src_filled) {
2158 int e;
2159 struct sockaddr_in6 sin6;
2160 struct route ro;
2161
2162 /*
2163 * This case matches to multicasts, our anycast, or unicasts
2164 * that we do not own. Select a source address based on the
2165 * source address of the erroneous packet.
2166 */
2167 /* zone ID should be embedded */
2168 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
2169
2170 memset(&ro, 0, sizeof(ro));
2171 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL,
2172 &ip6->ip6_src);
2173 rtcache_free(&ro);
2174 if (e != 0) {
2175 char ip6buf[INET6_ADDRSTRLEN];
2176 nd6log(LOG_DEBUG,
2177 "source can't be determined: "
2178 "dst=%s, error=%d\n",
2179 IN6_PRINT(ip6buf, &sin6.sin6_addr), e);
2180 goto bad;
2181 }
2182 }
2183
2184 ip6->ip6_flow = 0;
2185 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2186 ip6->ip6_vfc |= IPV6_VERSION;
2187 ip6->ip6_nxt = IPPROTO_ICMPV6;
2188 rcvif = m_get_rcvif(m, &s);
2189 if (rcvif) {
2190 /* XXX: This may not be the outgoing interface */
2191 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim;
2192 } else {
2193 ip6->ip6_hlim = ip6_defhlim;
2194 }
2195 m_put_rcvif(rcvif, &s);
2196
2197 m->m_pkthdr.csum_flags = 0;
2198 icmp6->icmp6_cksum = 0;
2199 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2200 sizeof(struct ip6_hdr), plen);
2201
2202 /*
2203 * XXX option handling
2204 */
2205
2206 m->m_flags &= ~(M_BCAST|M_MCAST);
2207
2208 /*
2209 * Note for icmp6_reflect_pmtu == false
2210 * To avoid a "too big" situation at an intermediate router
2211 * and the path MTU discovery process, specify the IPV6_MINMTU flag.
2212 * Note that only echo and node information replies are affected,
2213 * since the length of ICMP6 errors is limited to the minimum MTU.
2214 */
2215 flags = icmp6_reflect_pmtu ? 0 : IPV6_MINMTU;
2216 if (ip6_output(m, NULL, NULL, flags, NULL, NULL, &outif) != 0 &&
2217 outif)
2218 icmp6_ifstat_inc(outif, ifs6_out_error);
2219 if (outif)
2220 icmp6_ifoutstat_inc(outif, type, code);
2221
2222 return;
2223
2224 bad:
2225 m_freem(m);
2226 return;
2227 }
2228
2229 static const char *
icmp6_redirect_diag(char * buf,size_t buflen,struct in6_addr * src6,struct in6_addr * dst6,struct in6_addr * tgt6)2230 icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6,
2231 struct in6_addr *dst6, struct in6_addr *tgt6)
2232 {
2233 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
2234 char ip6buft[INET6_ADDRSTRLEN];
2235
2236 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)",
2237 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6),
2238 IN6_PRINT(ip6buft, tgt6));
2239 return buf;
2240 }
2241
2242 static void
icmp6_redirect_input(struct mbuf * m,int off)2243 icmp6_redirect_input(struct mbuf *m, int off)
2244 {
2245 struct ifnet *ifp;
2246 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2247 struct nd_redirect *nd_rd;
2248 int icmp6len = m->m_pkthdr.len - off;
2249 char *lladdr = NULL;
2250 int lladdrlen = 0;
2251 struct rtentry *rt = NULL;
2252 int is_router;
2253 int is_onlink;
2254 struct in6_addr src6 = ip6->ip6_src;
2255 struct in6_addr redtgt6;
2256 struct in6_addr reddst6;
2257 union nd_opts ndopts;
2258 struct psref psref;
2259 char ip6buf[INET6_ADDRSTRLEN];
2260 char diagbuf[256];
2261
2262 ifp = m_get_rcvif_psref(m, &psref);
2263 if (ifp == NULL)
2264 goto freeit;
2265
2266 /* XXX if we are router, we don't update route by icmp6 redirect */
2267 if (ip6_forwarding)
2268 goto freeit;
2269 if (!icmp6_rediraccept)
2270 goto freeit;
2271
2272 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2273 if (nd_rd == NULL) {
2274 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
2275 m_put_rcvif_psref(ifp, &psref);
2276 return;
2277 }
2278 redtgt6 = nd_rd->nd_rd_target;
2279 reddst6 = nd_rd->nd_rd_dst;
2280
2281 if (in6_setscope(&redtgt6, ifp, NULL) ||
2282 in6_setscope(&reddst6, ifp, NULL)) {
2283 goto freeit;
2284 }
2285
2286 /* validation */
2287 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2288 nd6log(LOG_ERR,
2289 "ICMP6 redirect sent from %s rejected; "
2290 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6));
2291 goto bad;
2292 }
2293 if (ip6->ip6_hlim != 255) {
2294 nd6log(LOG_ERR,
2295 "ICMP6 redirect sent from %s rejected; "
2296 "hlim=%d (must be 255)\n",
2297 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim);
2298 goto bad;
2299 }
2300
2301 {
2302 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2303 struct sockaddr_in6 sin6;
2304 struct in6_addr *gw6;
2305
2306 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0);
2307 rt = rtalloc1(sin6tosa(&sin6), 0);
2308 if (rt) {
2309 if (rt->rt_gateway == NULL ||
2310 rt->rt_gateway->sa_family != AF_INET6) {
2311 nd6log(LOG_ERR,
2312 "ICMP6 redirect rejected; no route "
2313 "with inet6 gateway found for redirect dst: %s\n",
2314 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2315 &src6, &reddst6, &redtgt6));
2316 rt_unref(rt);
2317 goto bad;
2318 }
2319
2320 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2321 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2322 nd6log(LOG_ERR,
2323 "ICMP6 redirect rejected; "
2324 "not equal to gw-for-src=%s (must be same): %s\n",
2325 IN6_PRINT(ip6buf, gw6),
2326 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2327 &src6, &reddst6, &redtgt6));
2328 rt_unref(rt);
2329 goto bad;
2330 }
2331 } else {
2332 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2333 "no route found for redirect dst: %s\n",
2334 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2335 &src6, &reddst6, &redtgt6));
2336 goto bad;
2337 }
2338 rt_unref(rt);
2339 rt = NULL;
2340 }
2341
2342 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2343 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2344 "redirect dst must be unicast: %s\n",
2345 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2346 &src6, &reddst6, &redtgt6));
2347 goto bad;
2348 }
2349
2350 is_router = is_onlink = 0;
2351 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2352 is_router = 1; /* router case */
2353 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2354 is_onlink = 1; /* on-link destination case */
2355 if (!is_router && !is_onlink) {
2356 nd6log(LOG_ERR, "ICMP6 redirect rejected; "
2357 "neither router case nor onlink case: %s\n",
2358 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2359 &src6, &reddst6, &redtgt6));
2360 goto bad;
2361 }
2362 /* validation passed */
2363
2364 icmp6len -= sizeof(*nd_rd);
2365 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2366 if (nd6_options(&ndopts) < 0) {
2367 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n",
2368 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2369 &src6, &reddst6, &redtgt6));
2370 /* nd6_options have incremented stats */
2371 goto freeit;
2372 }
2373
2374 if (ndopts.nd_opts_tgt_lladdr) {
2375 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2376 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2377 }
2378
2379 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2380 nd6log(LOG_INFO, "lladdrlen mismatch for %s "
2381 "(if %d, icmp6 packet %d): %s\n",
2382 IN6_PRINT(ip6buf, &redtgt6),
2383 ifp->if_addrlen, lladdrlen - 2,
2384 icmp6_redirect_diag(diagbuf, sizeof(diagbuf),
2385 &src6, &reddst6, &redtgt6));
2386 goto bad;
2387 }
2388
2389 /* RFC 2461 8.3 */
2390 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2391 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2392
2393 m_put_rcvif_psref(ifp, &psref);
2394 ifp = NULL;
2395
2396 if (!is_onlink) { /* better router case. perform rtredirect. */
2397 /* perform rtredirect */
2398 struct sockaddr_in6 sdst;
2399 struct sockaddr_in6 sgw;
2400 struct sockaddr_in6 ssrc;
2401 unsigned long rtcount;
2402 struct rtentry *newrt = NULL;
2403
2404 /*
2405 * do not install redirect route, if the number of entries
2406 * is too much (> hiwat). note that, the node (= host) will
2407 * work just fine even if we do not install redirect route
2408 * (there will be additional hops, though).
2409 */
2410 mutex_enter(&icmp6_mtx);
2411 rtcount = rt_timer_count(icmp6_redirect_timeout_q);
2412 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) {
2413 mutex_exit(&icmp6_mtx);
2414 goto freeit;
2415 }
2416 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) {
2417 mutex_exit(&icmp6_mtx);
2418 goto freeit;
2419 } else if (0 <= icmp6_redirect_lowat &&
2420 rtcount > icmp6_redirect_lowat) {
2421 /*
2422 * XXX nuke a victim, install the new one.
2423 */
2424 }
2425
2426 memset(&sdst, 0, sizeof(sdst));
2427 memset(&sgw, 0, sizeof(sgw));
2428 memset(&ssrc, 0, sizeof(ssrc));
2429 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2430 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2431 sizeof(struct sockaddr_in6);
2432 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2433 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2434 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2435 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL,
2436 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), &newrt);
2437
2438 if (newrt) {
2439 (void)rt_timer_add(newrt, icmp6_redirect_timeout,
2440 icmp6_redirect_timeout_q);
2441 rt_unref(newrt);
2442 }
2443 mutex_exit(&icmp6_mtx);
2444 }
2445 /* finally update cached route in each socket via pfctlinput */
2446 {
2447 struct sockaddr_in6 sdst;
2448
2449 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0);
2450 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst));
2451 #if defined(IPSEC)
2452 if (ipsec_used)
2453 key_sa_routechange(sin6tosa(&sdst));
2454 #endif
2455 }
2456
2457 freeit:
2458 if (ifp != NULL)
2459 m_put_rcvif_psref(ifp, &psref);
2460 m_freem(m);
2461 return;
2462
2463 bad:
2464 m_put_rcvif_psref(ifp, &psref);
2465 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT);
2466 m_freem(m);
2467 }
2468
2469 void
icmp6_redirect_output(struct mbuf * m0,struct rtentry * rt)2470 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2471 {
2472 struct ifnet *ifp; /* my outgoing interface */
2473 struct in6_addr *ifp_ll6;
2474 struct in6_addr *nexthop;
2475 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2476 struct mbuf *m = NULL; /* newly allocated one */
2477 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2478 struct nd_redirect *nd_rd;
2479 size_t maxlen;
2480 u_char *p;
2481 struct sockaddr_in6 src_sa;
2482
2483 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0);
2484
2485 /* if we are not router, we don't send icmp6 redirect */
2486 if (!ip6_forwarding)
2487 goto fail;
2488
2489 /* sanity check */
2490 KASSERT(m0 != NULL);
2491 KASSERT(rt != NULL);
2492
2493 ifp = rt->rt_ifp;
2494
2495 /*
2496 * Address check:
2497 * the source address must identify a neighbor, and
2498 * the destination address must not be a multicast address
2499 * [RFC 2461, sec 8.2]
2500 */
2501 sip6 = mtod(m0, struct ip6_hdr *);
2502 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0);
2503 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2504 goto fail;
2505 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2506 goto fail; /* what should we do here? */
2507
2508 /* rate limit */
2509 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2510 goto fail;
2511
2512 /*
2513 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2514 * we almost always ask for an mbuf cluster for simplicity.
2515 * (MHLEN < IPV6_MMTU is almost always true)
2516 */
2517 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2518 if (m && IPV6_MMTU >= MHLEN) {
2519 #if IPV6_MMTU >= MCLBYTES
2520 MEXTMALLOC(m, IPV6_MMTU, M_NOWAIT);
2521 #else
2522 MCLGET(m, M_DONTWAIT);
2523 #endif
2524 }
2525
2526 if (!m)
2527 goto fail;
2528 m_reset_rcvif(m);
2529 m->m_len = 0;
2530 maxlen = M_TRAILINGSPACE(m);
2531 maxlen = uimin(IPV6_MMTU, maxlen);
2532
2533 /* just for safety */
2534 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct nd_redirect) +
2535 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2536 goto fail;
2537 }
2538
2539 {
2540 /* get ip6 linklocal address for ifp(my outgoing interface). */
2541 struct in6_ifaddr *ia;
2542 int s = pserialize_read_enter();
2543 if ((ia = in6ifa_ifpforlinklocal(ifp,
2544 IN6_IFF_NOTREADY|
2545 IN6_IFF_ANYCAST)) == NULL) {
2546 pserialize_read_exit(s);
2547 goto fail;
2548 }
2549 ifp_ll6 = &ia->ia_addr.sin6_addr;
2550 pserialize_read_exit(s);
2551 }
2552
2553 /* get ip6 linklocal address for the router. */
2554 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2555 struct sockaddr_in6 *sin6;
2556 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2557 nexthop = &sin6->sin6_addr;
2558 if (!IN6_IS_ADDR_LINKLOCAL(nexthop))
2559 nexthop = NULL;
2560 } else
2561 nexthop = NULL;
2562
2563 /* ip6 */
2564 ip6 = mtod(m, struct ip6_hdr *);
2565 ip6->ip6_flow = 0;
2566 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2567 ip6->ip6_vfc |= IPV6_VERSION;
2568 /* ip6->ip6_plen will be set later */
2569 ip6->ip6_nxt = IPPROTO_ICMPV6;
2570 ip6->ip6_hlim = 255;
2571 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2572 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2573 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2574
2575 /* ND Redirect */
2576 nd_rd = (struct nd_redirect *)(ip6 + 1);
2577 nd_rd->nd_rd_type = ND_REDIRECT;
2578 nd_rd->nd_rd_code = 0;
2579 nd_rd->nd_rd_reserved = 0;
2580 if (rt->rt_flags & RTF_GATEWAY) {
2581 /*
2582 * nd_rd->nd_rd_target must be a link-local address in
2583 * better router cases.
2584 */
2585 if (!nexthop)
2586 goto fail;
2587 bcopy(nexthop, &nd_rd->nd_rd_target,
2588 sizeof(nd_rd->nd_rd_target));
2589 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2590 sizeof(nd_rd->nd_rd_dst));
2591 } else {
2592 /* make sure redtgt == reddst */
2593 nexthop = &sip6->ip6_dst;
2594 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2595 sizeof(nd_rd->nd_rd_target));
2596 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2597 sizeof(nd_rd->nd_rd_dst));
2598 }
2599
2600 p = (u_char *)(nd_rd + 1);
2601
2602 {
2603 /* target lladdr option */
2604 struct llentry *ln = NULL;
2605 int len, pad;
2606 struct nd_opt_hdr *nd_opt;
2607 char *lladdr;
2608
2609 ln = nd6_lookup(nexthop, ifp, false);
2610 if (ln == NULL)
2611 goto nolladdropt;
2612 len = sizeof(*nd_opt) + ifp->if_addrlen;
2613 len = (len + 7) & ~7; /* round by 8 */
2614 pad = len - (sizeof(*nd_opt) + ifp->if_addrlen);
2615
2616 /* safety check */
2617 if (len + (p - (u_char *)ip6) > maxlen) {
2618 LLE_RUNLOCK(ln);
2619 goto nolladdropt;
2620 }
2621
2622 if (ln->la_flags & LLE_VALID) {
2623 nd_opt = (struct nd_opt_hdr *)p;
2624 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2625 nd_opt->nd_opt_len = len >> 3;
2626 lladdr = (char *)(nd_opt + 1);
2627 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen);
2628 memset(lladdr + ifp->if_addrlen, 0, pad);
2629 p += len;
2630 }
2631 LLE_RUNLOCK(ln);
2632 }
2633 nolladdropt:
2634
2635 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2636
2637 /* just to be safe */
2638 if (m0->m_flags & M_DECRYPTED)
2639 goto noredhdropt;
2640 if (p - (u_char *)ip6 > maxlen)
2641 goto noredhdropt;
2642
2643 {
2644 /* redirected header option */
2645 int len;
2646 struct nd_opt_rd_hdr *nd_opt_rh;
2647
2648 /*
2649 * compute the maximum size for icmp6 redirect header option.
2650 * XXX room for auth header?
2651 */
2652 len = maxlen - (p - (u_char *)ip6);
2653 len &= ~7;
2654
2655 if (len < sizeof(*nd_opt_rh)) {
2656 goto noredhdropt;
2657 }
2658
2659 /*
2660 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2661 * about padding/truncate rule for the original IP packet.
2662 * From the discussion on IPv6imp in Feb 1999,
2663 * the consensus was:
2664 * - "attach as much as possible" is the goal
2665 * - pad if not aligned (original size can be guessed by
2666 * original ip6 header)
2667 * Following code adds the padding if it is simple enough,
2668 * and truncates if not.
2669 */
2670 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2671 /* not enough room, truncate */
2672 m_adj(m0, (len - sizeof(*nd_opt_rh)) -
2673 m0->m_pkthdr.len);
2674 } else {
2675 /*
2676 * enough room, truncate if not aligned.
2677 * we don't pad here for simplicity.
2678 */
2679 int extra;
2680
2681 extra = m0->m_pkthdr.len % 8;
2682 if (extra) {
2683 /* truncate */
2684 m_adj(m0, -extra);
2685 }
2686 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2687 }
2688
2689 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2690 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh));
2691 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2692 nd_opt_rh->nd_opt_rh_len = len >> 3;
2693 p += sizeof(*nd_opt_rh);
2694 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2695
2696 /* connect m0 to m */
2697 m->m_pkthdr.len += m0->m_pkthdr.len;
2698 m_cat(m, m0);
2699 m0 = NULL;
2700 }
2701 noredhdropt:
2702 if (m0) {
2703 m_freem(m0);
2704 m0 = NULL;
2705 }
2706
2707 /* XXX: clear embedded link IDs in the inner header */
2708 in6_clearscope(&sip6->ip6_src);
2709 in6_clearscope(&sip6->ip6_dst);
2710 in6_clearscope(&nd_rd->nd_rd_target);
2711 in6_clearscope(&nd_rd->nd_rd_dst);
2712
2713 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2714
2715 nd_rd->nd_rd_cksum = 0;
2716 nd_rd->nd_rd_cksum =
2717 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2718
2719 /* send the packet to outside... */
2720 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0)
2721 icmp6_ifstat_inc(ifp, ifs6_out_error);
2722
2723 icmp6_ifstat_inc(ifp, ifs6_out_msg);
2724 icmp6_ifstat_inc(ifp, ifs6_out_redirect);
2725 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT);
2726
2727 return;
2728
2729 fail:
2730 if (m)
2731 m_freem(m);
2732 if (m0)
2733 m_freem(m0);
2734 }
2735
2736 /*
2737 * ICMPv6 socket option processing.
2738 */
2739 int
icmp6_ctloutput(int op,struct socket * so,struct sockopt * sopt)2740 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
2741 {
2742 int error = 0;
2743 struct inpcb *inp = sotoinpcb(so);
2744
2745 if (sopt->sopt_level != IPPROTO_ICMPV6)
2746 return rip6_ctloutput(op, so, sopt);
2747
2748 switch (op) {
2749 case PRCO_SETOPT:
2750 switch (sopt->sopt_name) {
2751 case ICMP6_FILTER:
2752 {
2753 struct icmp6_filter fil;
2754
2755 error = sockopt_get(sopt, &fil, sizeof(fil));
2756 if (error)
2757 break;
2758 memcpy(in6p_icmp6filt(inp), &fil,
2759 sizeof(struct icmp6_filter));
2760 error = 0;
2761 break;
2762 }
2763
2764 default:
2765 error = ENOPROTOOPT;
2766 break;
2767 }
2768 break;
2769
2770 case PRCO_GETOPT:
2771 switch (sopt->sopt_name) {
2772 case ICMP6_FILTER:
2773 {
2774 if (in6p_icmp6filt(inp) == NULL) {
2775 error = EINVAL;
2776 break;
2777 }
2778 error = sockopt_set(sopt, in6p_icmp6filt(inp),
2779 sizeof(struct icmp6_filter));
2780 break;
2781 }
2782
2783 default:
2784 error = ENOPROTOOPT;
2785 break;
2786 }
2787 break;
2788 }
2789
2790 return error;
2791 }
2792
2793 /*
2794 * Perform rate limit check.
2795 * Returns 0 if it is okay to send the icmp6 packet.
2796 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2797 * limitation.
2798 *
2799 * XXX per-destination/type check necessary?
2800 */
2801 static int
icmp6_ratelimit(const struct in6_addr * dst,const int type,const int code)2802 icmp6_ratelimit(
2803 const struct in6_addr *dst, /* not used at this moment */
2804 const int type, /* not used at this moment */
2805 const int code) /* not used at this moment */
2806 {
2807 int ret;
2808
2809 ret = 0; /* okay to send */
2810
2811 /* PPS limit */
2812 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2813 icmp6errppslim)) {
2814 /* The packet is subject to rate limit */
2815 ret++;
2816 }
2817
2818 return ret;
2819 }
2820
2821 static struct rtentry *
icmp6_mtudisc_clone(struct sockaddr * dst)2822 icmp6_mtudisc_clone(struct sockaddr *dst)
2823 {
2824 struct rtentry *rt;
2825 int error;
2826
2827 rt = rtalloc1(dst, 1);
2828 if (rt == NULL)
2829 return NULL;
2830
2831 /* If we didn't get a host route, allocate one */
2832 if ((rt->rt_flags & RTF_HOST) == 0) {
2833 struct rtentry *nrt;
2834
2835 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL,
2836 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
2837 if (error) {
2838 rt_unref(rt);
2839 return NULL;
2840 }
2841 nrt->rt_rmx = rt->rt_rmx;
2842 rt_newmsg_dynamic(RTM_ADD, nrt);
2843 rt_unref(rt);
2844 rt = nrt;
2845 }
2846
2847 mutex_enter(&icmp6_mtx);
2848 error = rt_timer_add(rt, icmp6_mtudisc_timeout,
2849 icmp6_mtudisc_timeout_q);
2850 mutex_exit(&icmp6_mtx);
2851
2852 if (error) {
2853 rt_unref(rt);
2854 return NULL;
2855 }
2856
2857 return rt; /* caller need to call rtfree() */
2858 }
2859
2860 static void
icmp6_mtudisc_timeout(struct rtentry * rt,struct rttimer * r)2861 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r)
2862 {
2863 struct rtentry *retrt;
2864
2865 KASSERT(rt != NULL);
2866 rt_assert_referenced(rt);
2867
2868 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
2869 (RTF_DYNAMIC | RTF_HOST)) {
2870 rtrequest(RTM_DELETE, rt_getkey(rt),
2871 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
2872 rt_newmsg_dynamic(RTM_DELETE, retrt);
2873 rt_unref(rt);
2874 rt_free(retrt);
2875 } else {
2876 if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
2877 rt->rt_rmx.rmx_mtu = 0;
2878 }
2879 }
2880
2881 static void
icmp6_redirect_timeout(struct rtentry * rt,struct rttimer * r)2882 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r)
2883 {
2884 struct rtentry *retrt;
2885
2886 KASSERT(rt != NULL);
2887 rt_assert_referenced(rt);
2888
2889 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
2890 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
2891 rtrequest(RTM_DELETE, rt_getkey(rt),
2892 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
2893 rt_newmsg_dynamic(RTM_DELETE, retrt);
2894 rt_unref(rt);
2895 rt_free(retrt);
2896 }
2897 }
2898
2899 #ifdef COMPAT_90
2900 /*
2901 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly?
2902 */
2903 static int
sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS)2904 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS)
2905 {
2906 (void)&name;
2907 (void)&l;
2908 (void)&oname;
2909
2910 if (namelen != 0)
2911 return (EINVAL);
2912
2913 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp,
2914 /*XXXUNCONST*/
2915 __UNCONST(newp), newlen));
2916 }
2917 #endif
2918
2919 static int
sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)2920 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)
2921 {
2922
2923 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS));
2924 }
2925
2926 static int
sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)2927 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)
2928 {
2929 int error, tmp;
2930 struct sysctlnode node;
2931
2932 mutex_enter(&icmp6_mtx);
2933
2934 node = *rnode;
2935 node.sysctl_data = &tmp;
2936 tmp = icmp6_redirtimeout;
2937 error = sysctl_lookup(SYSCTLFN_CALL(&node));
2938 if (error || newp == NULL)
2939 goto out;
2940 if (tmp < 0) {
2941 error = EINVAL;
2942 goto out;
2943 }
2944 icmp6_redirtimeout = tmp;
2945
2946 if (icmp6_redirect_timeout_q != NULL) {
2947 if (icmp6_redirtimeout == 0) {
2948 rt_timer_queue_destroy(icmp6_redirect_timeout_q);
2949 } else {
2950 rt_timer_queue_change(icmp6_redirect_timeout_q,
2951 icmp6_redirtimeout);
2952 }
2953 } else if (icmp6_redirtimeout > 0) {
2954 icmp6_redirect_timeout_q =
2955 rt_timer_queue_create(icmp6_redirtimeout);
2956 }
2957 error = 0;
2958 out:
2959 mutex_exit(&icmp6_mtx);
2960 return error;
2961 }
2962
2963 static void
sysctl_net_inet6_icmp6_setup(struct sysctllog ** clog)2964 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog)
2965 {
2966
2967 sysctl_createv(clog, 0, NULL, NULL,
2968 CTLFLAG_PERMANENT,
2969 CTLTYPE_NODE, "inet6", NULL,
2970 NULL, 0, NULL, 0,
2971 CTL_NET, PF_INET6, CTL_EOL);
2972 sysctl_createv(clog, 0, NULL, NULL,
2973 CTLFLAG_PERMANENT,
2974 CTLTYPE_NODE, "icmp6",
2975 SYSCTL_DESCR("ICMPv6 related settings"),
2976 NULL, 0, NULL, 0,
2977 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL);
2978
2979 sysctl_createv(clog, 0, NULL, NULL,
2980 CTLFLAG_PERMANENT,
2981 CTLTYPE_STRUCT, "stats",
2982 SYSCTL_DESCR("ICMPv6 transmission statistics"),
2983 sysctl_net_inet6_icmp6_stats, 0, NULL, 0,
2984 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2985 ICMPV6CTL_STATS, CTL_EOL);
2986 sysctl_createv(clog, 0, NULL, NULL,
2987 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2988 CTLTYPE_INT, "rediraccept",
2989 SYSCTL_DESCR("Accept and process redirect messages"),
2990 NULL, 0, &icmp6_rediraccept, 0,
2991 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2992 ICMPV6CTL_REDIRACCEPT, CTL_EOL);
2993 sysctl_createv(clog, 0, NULL, NULL,
2994 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2995 CTLTYPE_INT, "redirtimeout",
2996 SYSCTL_DESCR("Redirect generated route lifetime"),
2997 sysctl_net_inet6_icmp6_redirtimeout, 0,
2998 &icmp6_redirtimeout, 0,
2999 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3000 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL);
3001 #if 0 /* obsoleted */
3002 sysctl_createv(clog, 0, NULL, NULL,
3003 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3004 CTLTYPE_INT, "errratelimit", NULL,
3005 NULL, 0, &icmp6_errratelimit, 0,
3006 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3007 ICMPV6CTL_ERRRATELIMIT, CTL_EOL);
3008 #endif
3009 sysctl_createv(clog, 0, NULL, NULL,
3010 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3011 CTLTYPE_INT, "nd6_prune",
3012 SYSCTL_DESCR("Neighbor discovery prune interval"),
3013 NULL, 0, &nd6_prune, 0,
3014 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3015 ICMPV6CTL_ND6_PRUNE, CTL_EOL);
3016 sysctl_createv(clog, 0, NULL, NULL,
3017 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3018 CTLTYPE_INT, "nd6_delay",
3019 SYSCTL_DESCR("First probe delay time"),
3020 NULL, 0, &nd6_nd_domain.nd_delay, 0,
3021 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3022 ICMPV6CTL_ND6_DELAY, CTL_EOL);
3023 sysctl_createv(clog, 0, NULL, NULL,
3024 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3025 CTLTYPE_INT, "nd6_mmaxtries",
3026 SYSCTL_DESCR("Number of multicast discovery attempts"),
3027 NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0,
3028 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3029 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL);
3030 sysctl_createv(clog, 0, NULL, NULL,
3031 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3032 CTLTYPE_INT, "nd6_umaxtries",
3033 SYSCTL_DESCR("Number of unicast discovery attempts"),
3034 NULL, 0, &nd6_nd_domain.nd_umaxtries, 0,
3035 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3036 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL);
3037 sysctl_createv(clog, 0, NULL, NULL,
3038 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3039 CTLTYPE_INT, "nd6_maxnudhint",
3040 SYSCTL_DESCR("Maximum neighbor unreachable hint count"),
3041 NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0,
3042 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3043 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL);
3044 sysctl_createv(clog, 0, NULL, NULL,
3045 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3046 CTLTYPE_INT, "maxqueuelen",
3047 SYSCTL_DESCR("max packet queue len for a unresolved ND"),
3048 NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0,
3049 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3050 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL);
3051 sysctl_createv(clog, 0, NULL, NULL,
3052 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3053 CTLTYPE_INT, "nd6_useloopback",
3054 SYSCTL_DESCR("Use loopback interface for local traffic"),
3055 NULL, 0, &nd6_useloopback, 0,
3056 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3057 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL);
3058 #if 0 /* obsoleted */
3059 sysctl_createv(clog, 0, NULL, NULL,
3060 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3061 CTLTYPE_INT, "nd6_proxyall", NULL,
3062 NULL, 0, &nd6_proxyall, 0,
3063 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3064 ICMPV6CTL_ND6_PROXYALL, CTL_EOL);
3065 #endif
3066 sysctl_createv(clog, 0, NULL, NULL,
3067 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3068 CTLTYPE_INT, "nodeinfo",
3069 SYSCTL_DESCR("Respond to node information requests"),
3070 NULL, 0, &icmp6_nodeinfo, 0,
3071 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3072 ICMPV6CTL_NODEINFO, CTL_EOL);
3073 sysctl_createv(clog, 0, NULL, NULL,
3074 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3075 CTLTYPE_INT, "errppslimit",
3076 SYSCTL_DESCR("Maximum ICMP errors sent per second"),
3077 NULL, 0, &icmp6errppslim, 0,
3078 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3079 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL);
3080 sysctl_createv(clog, 0, NULL, NULL,
3081 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3082 CTLTYPE_INT, "mtudisc_hiwat",
3083 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
3084 NULL, 0, &icmp6_mtudisc_hiwat, 0,
3085 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3086 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL);
3087 sysctl_createv(clog, 0, NULL, NULL,
3088 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3089 CTLTYPE_INT, "mtudisc_lowat",
3090 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
3091 NULL, 0, &icmp6_mtudisc_lowat, 0,
3092 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3093 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL);
3094 sysctl_createv(clog, 0, NULL, NULL,
3095 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3096 CTLTYPE_INT, "nd6_debug",
3097 SYSCTL_DESCR("Enable neighbor discovery debug output"),
3098 NULL, 0, &nd6_debug, 0,
3099 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3100 ICMPV6CTL_ND6_DEBUG, CTL_EOL);
3101 #ifdef COMPAT_90
3102 sysctl_createv(clog, 0, NULL, NULL,
3103 CTLFLAG_PERMANENT,
3104 CTLTYPE_STRUCT, "nd6_drlist",
3105 SYSCTL_DESCR("Default router list"),
3106 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
3107 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3108 OICMPV6CTL_ND6_DRLIST, CTL_EOL);
3109 sysctl_createv(clog, 0, NULL, NULL,
3110 CTLFLAG_PERMANENT,
3111 CTLTYPE_STRUCT, "nd6_prlist",
3112 SYSCTL_DESCR("Prefix list"),
3113 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0,
3114 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3115 OICMPV6CTL_ND6_PRLIST, CTL_EOL);
3116 #endif
3117 sysctl_createv(clog, 0, NULL, NULL,
3118 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3119 CTLTYPE_BOOL, "reflect_pmtu",
3120 SYSCTL_DESCR("Use path MTU Discovery for icmpv6 reflect"),
3121 NULL, 0, &icmp6_reflect_pmtu, 0,
3122 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3123 ICMPV6CTL_REFLECT_PMTU, CTL_EOL);
3124 sysctl_createv(clog, 0, NULL, NULL,
3125 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3126 CTLTYPE_BOOL, "dynamic_rt_msg",
3127 SYSCTL_DESCR("Send routing message for RTF_DYNAMIC"),
3128 NULL, 0, &icmp6_dynamic_rt_msg, 0,
3129 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3130 ICMPV6CTL_DYNAMIC_RT_MSG, CTL_EOL);
3131 }
3132
3133 void
icmp6_statinc(u_int stat)3134 icmp6_statinc(u_int stat)
3135 {
3136
3137 KASSERT(stat < ICMP6_NSTATS);
3138 ICMP6_STATINC(stat);
3139 }
3140