1 /* $NetBSD: icmp6.c,v 1.258 2024/07/05 04:31:54 rin 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 1.258 2024/07/05 04:31:54 rin 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 net_stat_ref_t icmp6s = ICMP6_STAT_GETREF();
698 _NET_STATINC_REF(icmp6s, ICMP6_STAT_REFLECT);
699 _NET_STATINC_REF(icmp6s,
700 ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY);
701 ICMP6_STAT_PUTREF();
702 icmp6_reflect(n, off);
703 }
704 if (!m)
705 goto freeit;
706 break;
707
708 case ICMP6_ECHO_REPLY:
709 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply);
710 if (code != 0)
711 goto badcode;
712 break;
713
714 case MLD_LISTENER_QUERY:
715 case MLD_LISTENER_REPORT:
716 if (icmp6len < sizeof(struct mld_hdr))
717 goto badlen;
718 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
719 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery);
720 else
721 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport);
722 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
723 /* give up local */
724 mld_input(m, off);
725 m = NULL;
726 goto freeit;
727 }
728 mld_input(n, off);
729 /* m stays. */
730 break;
731
732 case MLD_LISTENER_DONE:
733 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone);
734 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
735 goto badlen;
736 break; /* nothing to be done in kernel */
737
738 case MLD_MTRACE_RESP:
739 case MLD_MTRACE:
740 /* XXX: these two are experimental. not officially defined. */
741 /* XXX: per-interface statistics? */
742 break; /* just pass it to applications */
743
744 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
745 {
746 enum { WRU, FQDN } mode;
747
748 if (!icmp6_nodeinfo)
749 break;
750
751 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
752 mode = WRU;
753 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
754 mode = FQDN;
755 else
756 goto badlen;
757
758 if (mode == FQDN) {
759 n = m_copypacket(m, M_DONTWAIT);
760 if (n)
761 n = ni6_input(n, off);
762 } else {
763 u_char *p;
764 int maxhlen;
765
766 if ((icmp6_nodeinfo & 5) != 5)
767 break;
768
769 if (code != 0)
770 goto badcode;
771 MGETHDR(n, M_DONTWAIT, m->m_type);
772 if (n && ICMP6_MAXLEN > MHLEN) {
773 MCLGET(n, M_DONTWAIT);
774 if ((n->m_flags & M_EXT) == 0) {
775 m_free(n);
776 n = NULL;
777 }
778 }
779 if (n == NULL) {
780 /* Give up remote */
781 break;
782 }
783 m_reset_rcvif(n);
784 n->m_len = 0;
785 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN;
786 if (maxhlen < 0) {
787 m_free(n);
788 break;
789 }
790 if (maxhlen > hostnamelen)
791 maxhlen = hostnamelen;
792 /*
793 * Copy IPv6 and ICMPv6 only.
794 */
795 nip6 = mtod(n, struct ip6_hdr *);
796 memcpy(nip6, ip6, sizeof(struct ip6_hdr));
797 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
798 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr));
799
800 p = (u_char *)(nicmp6 + 1);
801 memset(p, 0, 4);
802 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */
803
804 m_copy_pkthdr(n, m);
805 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
806 sizeof(struct icmp6_hdr) + 4 + maxhlen;
807 nicmp6->icmp6_type = ICMP6_WRUREPLY;
808 nicmp6->icmp6_code = 0;
809 }
810 if (n) {
811 net_stat_ref_t icmp6s = ICMP6_STAT_GETREF();
812 _NET_STATINC_REF(icmp6s, ICMP6_STAT_REFLECT);
813 _NET_STATINC_REF(icmp6s,
814 ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY);
815 ICMP6_STAT_PUTREF();
816 icmp6_reflect(n, sizeof(struct ip6_hdr));
817 }
818 break;
819 }
820
821 case ICMP6_WRUREPLY:
822 if (code != 0)
823 goto badcode;
824 break;
825
826 case ND_ROUTER_SOLICIT:
827 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit);
828 /* FALLTHROUGH */
829 case ND_ROUTER_ADVERT:
830 if (icmp6->icmp6_type == ND_ROUTER_ADVERT)
831 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert);
832 if (code != 0)
833 goto badcode;
834 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT &&
835 icmp6len < sizeof(struct nd_router_solicit)) ||
836 (icmp6->icmp6_type == ND_ROUTER_ADVERT &&
837 icmp6len < sizeof(struct nd_router_advert)))
838 goto badlen;
839 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
840 /* give up local */
841 nd6_rtr_cache(m, off, icmp6len, icmp6->icmp6_type);
842 m = NULL;
843 goto freeit;
844 }
845 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type);
846 /* m stays. */
847 break;
848
849 case ND_NEIGHBOR_SOLICIT:
850 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit);
851 if (code != 0)
852 goto badcode;
853 if (icmp6len < sizeof(struct nd_neighbor_solicit))
854 goto badlen;
855 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
856 /* give up local */
857 nd6_ns_input(m, off, icmp6len);
858 m = NULL;
859 goto freeit;
860 }
861 nd6_ns_input(n, off, icmp6len);
862 /* m stays. */
863 break;
864
865 case ND_NEIGHBOR_ADVERT:
866 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert);
867 if (code != 0)
868 goto badcode;
869 if (icmp6len < sizeof(struct nd_neighbor_advert))
870 goto badlen;
871 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
872 /* give up local */
873 nd6_na_input(m, off, icmp6len);
874 m = NULL;
875 goto freeit;
876 }
877 nd6_na_input(n, off, icmp6len);
878 /* m stays. */
879 break;
880
881 case ND_REDIRECT:
882 icmp6_ifstat_inc(rcvif, ifs6_in_redirect);
883 if (code != 0)
884 goto badcode;
885 if (icmp6len < sizeof(struct nd_redirect))
886 goto badlen;
887 if ((n = m_copypacket(m, M_DONTWAIT)) == NULL) {
888 /* give up local */
889 icmp6_redirect_input(m, off);
890 m = NULL;
891 goto freeit;
892 }
893 icmp6_redirect_input(n, off);
894 /* m stays. */
895 break;
896
897 case ICMP6_ROUTER_RENUMBERING:
898 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
899 code != ICMP6_ROUTER_RENUMBERING_RESULT)
900 goto badcode;
901 if (icmp6len < sizeof(struct icmp6_router_renum))
902 goto badlen;
903 break;
904
905 default:
906 nd6log(LOG_DEBUG,
907 "unknown type %d(src=%s, dst=%s, ifid=%d)\n",
908 icmp6->icmp6_type,
909 IN6_PRINT(ip6buf, &ip6->ip6_src),
910 IN6_PRINT(ip6buf2, &ip6->ip6_dst),
911 rcvif ? rcvif->if_index : 0);
912 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
913 /* ICMPv6 error: MUST deliver it by spec... */
914 code = PRC_NCMDS;
915 /* deliver */
916 } else {
917 /* ICMPv6 informational: MUST not deliver */
918 break;
919 }
920 deliver:
921 if (icmp6_notify_error(m, off, icmp6len, code)) {
922 /* In this case, m should've been freed. */
923 m_put_rcvif_psref(rcvif, &psref);
924 return;
925 }
926 break;
927
928 badcode:
929 ICMP6_STATINC(ICMP6_STAT_BADCODE);
930 break;
931
932 badlen:
933 ICMP6_STATINC(ICMP6_STAT_BADLEN);
934 break;
935 }
936 m_put_rcvif_psref(rcvif, &psref);
937
938 /* deliver the packet to appropriate sockets */
939 icmp6_rip6_input(&m, off);
940
941 return;
942
943 freeit:
944 m_put_rcvif_psref(rcvif, &psref);
945 m_freem(m);
946 return;
947 }
948
949 int
icmp6_input(struct mbuf ** mp,int * offp,int proto)950 icmp6_input(struct mbuf **mp, int *offp, int proto)
951 {
952
953 wqinput_input(icmp6_wqinput, *mp, *offp, proto);
954
955 return IPPROTO_DONE;
956 }
957
958 static int
icmp6_notify_error(struct mbuf * m,int off,int icmp6len,int code)959 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
960 {
961 struct icmp6_hdr *icmp6;
962 struct ip6_hdr *eip6;
963 u_int32_t notifymtu;
964 struct sockaddr_in6 icmp6src, icmp6dst;
965
966 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
967 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
968 goto freeit;
969 }
970 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
971 sizeof(*icmp6) + sizeof(struct ip6_hdr));
972 if (icmp6 == NULL) {
973 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
974 return (-1);
975 }
976 eip6 = (struct ip6_hdr *)(icmp6 + 1);
977
978 /* Detect the upper level protocol */
979 {
980 void *(*ctlfunc)(int, const struct sockaddr *, void *);
981 u_int8_t nxt = eip6->ip6_nxt;
982 int eoff = off + sizeof(struct icmp6_hdr) +
983 sizeof(struct ip6_hdr);
984 struct ip6ctlparam ip6cp;
985 struct in6_addr *finaldst = NULL;
986 int icmp6type = icmp6->icmp6_type;
987 struct ip6_frag *fh;
988 struct ip6_rthdr *rth;
989 struct ifnet *rcvif;
990 int s;
991
992 while (1) { /* XXX: should avoid infinite loop explicitly? */
993 struct ip6_ext *eh;
994
995 switch (nxt) {
996 case IPPROTO_HOPOPTS:
997 case IPPROTO_DSTOPTS:
998 case IPPROTO_AH:
999 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
1000 eoff, sizeof(*eh));
1001 if (eh == NULL) {
1002 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1003 return (-1);
1004 }
1005
1006 if (nxt == IPPROTO_AH)
1007 eoff += (eh->ip6e_len + 2) << 2;
1008 else
1009 eoff += (eh->ip6e_len + 1) << 3;
1010 nxt = eh->ip6e_nxt;
1011 break;
1012 case IPPROTO_ROUTING:
1013 /* Ignore the option. */
1014 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
1015 eoff, sizeof(*rth));
1016 if (rth == NULL) {
1017 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1018 return (-1);
1019 }
1020
1021 eoff += (rth->ip6r_len + 1) << 3;
1022 nxt = rth->ip6r_nxt;
1023 break;
1024 case IPPROTO_FRAGMENT:
1025 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1026 eoff, sizeof(*fh));
1027 if (fh == NULL) {
1028 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1029 return (-1);
1030 }
1031 /*
1032 * Data after a fragment header is meaningless
1033 * unless it is the first fragment, but
1034 * we'll go to the notify label for path MTU
1035 * discovery.
1036 */
1037 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1038 goto notify;
1039
1040 eoff += sizeof(struct ip6_frag);
1041 nxt = fh->ip6f_nxt;
1042 break;
1043 default:
1044 /*
1045 * This case includes ESP and the No Next
1046 * Header. In such cases going to the notify
1047 * label does not have any meaning
1048 * (i.e. ctlfunc will be NULL), but we go
1049 * anyway since we might have to update
1050 * path MTU information.
1051 */
1052 goto notify;
1053 }
1054 }
1055 notify:
1056 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1057 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1058 if (icmp6 == NULL) {
1059 ICMP6_STATINC(ICMP6_STAT_TOOSHORT);
1060 return (-1);
1061 }
1062
1063 /*
1064 * retrieve parameters from the inner IPv6 header, and convert
1065 * them into sockaddr structures.
1066 * XXX: there is no guarantee that the source or destination
1067 * addresses of the inner packet are in the same scope zone as
1068 * the addresses of the icmp packet. But there is no other
1069 * way to determine the zone.
1070 */
1071 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1072
1073 rcvif = m_get_rcvif(m, &s);
1074 if (__predict_false(rcvif == NULL))
1075 goto freeit;
1076 sockaddr_in6_init(&icmp6dst,
1077 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0);
1078 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) {
1079 m_put_rcvif(rcvif, &s);
1080 goto freeit;
1081 }
1082 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0);
1083 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) {
1084 m_put_rcvif(rcvif, &s);
1085 goto freeit;
1086 }
1087 m_put_rcvif(rcvif, &s);
1088
1089 icmp6src.sin6_flowinfo =
1090 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1091
1092 if (finaldst == NULL)
1093 finaldst = &eip6->ip6_dst;
1094 ip6cp.ip6c_m = m;
1095 ip6cp.ip6c_icmp6 = icmp6;
1096 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1097 ip6cp.ip6c_off = eoff;
1098 ip6cp.ip6c_finaldst = finaldst;
1099 ip6cp.ip6c_src = &icmp6src;
1100 ip6cp.ip6c_nxt = nxt;
1101
1102 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1103 notifymtu = ntohl(icmp6->icmp6_mtu);
1104 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1105 }
1106
1107 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput;
1108 if (ctlfunc) {
1109 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), &ip6cp);
1110 }
1111 }
1112 return (0);
1113
1114 freeit:
1115 m_freem(m);
1116 return (-1);
1117 }
1118
1119 void
icmp6_mtudisc_update(struct ip6ctlparam * ip6cp,int validated)1120 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1121 {
1122 unsigned long rtcount;
1123 struct icmp6_mtudisc_callback *mc;
1124 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1125 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1126 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1127 u_int mtu = ntohl(icmp6->icmp6_mtu);
1128 struct rtentry *rt = NULL;
1129 struct sockaddr_in6 sin6;
1130 struct ifnet *rcvif;
1131 int s;
1132
1133 /*
1134 * The MTU should not be less than the minimal IPv6 MTU except for the
1135 * hack in ip6_output/ip6_setpmtu where we always include a frag header.
1136 * In that one case, the MTU might be less than 1280.
1137 */
1138 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) {
1139 /* is the mtu even sane? */
1140 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1141 return;
1142 if (!validated)
1143 return;
1144 mtu = IPV6_MMTU - sizeof(struct ip6_frag);
1145 }
1146
1147 /*
1148 * allow non-validated cases if memory is plenty, to make traffic
1149 * from non-connected pcb happy.
1150 */
1151 mutex_enter(&icmp6_mtx);
1152 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q);
1153 if (validated) {
1154 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) {
1155 mutex_exit(&icmp6_mtx);
1156 return;
1157 } else if (0 <= icmp6_mtudisc_lowat &&
1158 rtcount > icmp6_mtudisc_lowat) {
1159 /*
1160 * XXX nuke a victim, install the new one.
1161 */
1162 }
1163 } else {
1164 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) {
1165 mutex_exit(&icmp6_mtx);
1166 return;
1167 }
1168 }
1169 mutex_exit(&icmp6_mtx);
1170
1171 memset(&sin6, 0, sizeof(sin6));
1172 sin6.sin6_family = PF_INET6;
1173 sin6.sin6_len = sizeof(struct sockaddr_in6);
1174 sin6.sin6_addr = *dst;
1175 rcvif = m_get_rcvif(m, &s);
1176 if (__predict_false(rcvif == NULL))
1177 return;
1178 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) {
1179 m_put_rcvif(rcvif, &s);
1180 return;
1181 }
1182 m_put_rcvif(rcvif, &s);
1183
1184 rt = icmp6_mtudisc_clone(sin6tosa(&sin6));
1185
1186 if (rt && (rt->rt_flags & RTF_HOST) &&
1187 !(rt->rt_rmx.rmx_locks & RTV_MTU) &&
1188 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) {
1189 if (mtu < rt->rt_ifp->if_mtu) {
1190 ICMP6_STATINC(ICMP6_STAT_PMTUCHG);
1191 rt->rt_rmx.rmx_mtu = mtu;
1192 }
1193 }
1194 if (rt) {
1195 rt_unref(rt);
1196 }
1197
1198 /*
1199 * Notify protocols that the MTU for this destination
1200 * has changed.
1201 */
1202 mutex_enter(&icmp6_mtx);
1203 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL;
1204 mc = LIST_NEXT(mc, mc_list))
1205 (*mc->mc_func)(&sin6.sin6_addr);
1206 mutex_exit(&icmp6_mtx);
1207 }
1208
1209 /*
1210 * Process a Node Information Query packet, based on
1211 * draft-ietf-ipngwg-icmp-name-lookups-07.
1212 *
1213 * Spec incompatibilities:
1214 * - IPv6 Subject address handling
1215 * - IPv4 Subject address handling support missing
1216 * - Proxy reply (answer even if it's not for me)
1217 * - joins NI group address at in6_ifattach() time only, does not cope
1218 * with hostname changes by sethostname(3)
1219 */
1220 static struct mbuf *
ni6_input(struct mbuf * m,int off)1221 ni6_input(struct mbuf *m, int off)
1222 {
1223 struct icmp6_nodeinfo *ni6, *nni6;
1224 struct mbuf *n = NULL;
1225 u_int16_t qtype;
1226 int subjlen;
1227 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1228 struct ni_reply_fqdn *fqdn;
1229 int addrs; /* for NI_QTYPE_NODEADDR */
1230 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1231 struct sockaddr_in6 sin6; /* ip6_dst */
1232 struct in6_addr in6_subj; /* subject address */
1233 struct ip6_hdr *ip6;
1234 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1235 char *subj = NULL;
1236 struct ifnet *rcvif;
1237 int s, ss;
1238 struct ifaddr *ifa;
1239 struct psref psref;
1240
1241 ip6 = mtod(m, struct ip6_hdr *);
1242 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1243 if (ni6 == NULL) {
1244 /* m is already reclaimed */
1245 return NULL;
1246 }
1247 KASSERT((m->m_flags & M_PKTHDR) != 0);
1248
1249 /*
1250 * Validate IPv6 destination address.
1251 *
1252 * The Responder must discard the Query without further processing
1253 * unless it is one of the Responder's unicast or anycast addresses, or
1254 * a link-local scope multicast address which the Responder has joined.
1255 * [icmp-name-lookups-07, Section 4.]
1256 */
1257 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0);
1258 /* XXX scopeid */
1259 ss = pserialize_read_enter();
1260 ifa = ifa_ifwithaddr(sin6tosa(&sin6));
1261 if (ifa != NULL) {
1262 ; /* unicast/anycast, fine */
1263 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) {
1264 ; /* link-local multicast, fine */
1265 } else {
1266 pserialize_read_exit(ss);
1267 goto bad;
1268 }
1269 pserialize_read_exit(ss);
1270
1271 /* validate query Subject field. */
1272 qtype = ntohs(ni6->ni_qtype);
1273 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1274 switch (qtype) {
1275 case NI_QTYPE_NOOP:
1276 case NI_QTYPE_SUPTYPES:
1277 /* 07 draft */
1278 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1279 break;
1280 /* FALLTHROUGH */
1281 case NI_QTYPE_FQDN:
1282 case NI_QTYPE_NODEADDR:
1283 case NI_QTYPE_IPV4ADDR:
1284 switch (ni6->ni_code) {
1285 case ICMP6_NI_SUBJ_IPV6:
1286 #if ICMP6_NI_SUBJ_IPV6 != 0
1287 case 0:
1288 #endif
1289 /*
1290 * backward compatibility - try to accept 03 draft
1291 * format, where no Subject is present.
1292 */
1293 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1294 subjlen == 0) {
1295 oldfqdn++;
1296 break;
1297 }
1298 #if ICMP6_NI_SUBJ_IPV6 != 0
1299 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1300 goto bad;
1301 #endif
1302
1303 if (subjlen != sizeof(sin6.sin6_addr))
1304 goto bad;
1305
1306 /*
1307 * Validate Subject address.
1308 *
1309 * Not sure what exactly "address belongs to the node"
1310 * means in the spec, is it just unicast, or what?
1311 *
1312 * At this moment we consider Subject address as
1313 * "belong to the node" if the Subject address equals
1314 * to the IPv6 destination address; validation for
1315 * IPv6 destination address should have done enough
1316 * check for us.
1317 *
1318 * We do not do proxy at this moment.
1319 */
1320 /* m_pulldown instead of copy? */
1321 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1322 subjlen, (void *)&in6_subj);
1323 rcvif = m_get_rcvif(m, &s);
1324 if (__predict_false(rcvif == NULL))
1325 goto bad;
1326 if (in6_setscope(&in6_subj, rcvif, NULL)) {
1327 m_put_rcvif(rcvif, &s);
1328 goto bad;
1329 }
1330 m_put_rcvif(rcvif, &s);
1331
1332 subj = (char *)&in6_subj;
1333 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1334 break;
1335
1336 /*
1337 * XXX if we are to allow other cases, we should really
1338 * be careful about scope here.
1339 * basically, we should disallow queries toward IPv6
1340 * destination X with subject Y, if scope(X) > scope(Y).
1341 * if we allow scope(X) > scope(Y), it will result in
1342 * information leakage across scope boundary.
1343 */
1344 goto bad;
1345
1346 case ICMP6_NI_SUBJ_FQDN:
1347 /*
1348 * Validate Subject name with gethostname(3).
1349 *
1350 * The behavior may need some debate, since:
1351 * - we are not sure if the node has FQDN as
1352 * hostname (returned by gethostname(3)).
1353 * - the code does wildcard match for truncated names.
1354 * however, we are not sure if we want to perform
1355 * wildcard match, if gethostname(3) side has
1356 * truncated hostname.
1357 */
1358 n = ni6_nametodns(hostname, hostnamelen, 0);
1359 if (!n || n->m_next || n->m_len == 0)
1360 goto bad;
1361 IP6_EXTHDR_GET(subj, char *, m,
1362 off + sizeof(struct icmp6_nodeinfo), subjlen);
1363 if (subj == NULL)
1364 goto bad;
1365 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1366 n->m_len)) {
1367 goto bad;
1368 }
1369 m_freem(n);
1370 n = NULL;
1371 break;
1372
1373 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1374 default:
1375 goto bad;
1376 }
1377 break;
1378 }
1379
1380 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1381 switch (qtype) {
1382 case NI_QTYPE_FQDN:
1383 if ((icmp6_nodeinfo & 1) == 0)
1384 goto bad;
1385 break;
1386 case NI_QTYPE_NODEADDR:
1387 case NI_QTYPE_IPV4ADDR:
1388 if ((icmp6_nodeinfo & 2) == 0)
1389 goto bad;
1390 break;
1391 }
1392
1393 /* guess reply length */
1394 switch (qtype) {
1395 case NI_QTYPE_NOOP:
1396 break; /* no reply data */
1397 case NI_QTYPE_SUPTYPES:
1398 replylen += sizeof(u_int32_t);
1399 break;
1400 case NI_QTYPE_FQDN:
1401 /* will append an mbuf */
1402 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1403 break;
1404 case NI_QTYPE_NODEADDR:
1405 addrs = ni6_addrs(ni6, &ifp, subj, &psref);
1406 replylen += addrs *
1407 (sizeof(struct in6_addr) + sizeof(u_int32_t));
1408 if (replylen > MCLBYTES)
1409 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1410 break;
1411 case NI_QTYPE_IPV4ADDR:
1412 /* unsupported - should respond with unknown Qtype? */
1413 goto bad;
1414 default:
1415 /*
1416 * XXX: We must return a reply with the ICMP6 code
1417 * `unknown Qtype' in this case. However we regard the case
1418 * as an FQDN query for backward compatibility.
1419 * Older versions set a random value to this field,
1420 * so it rarely varies in the defined qtypes.
1421 * But the mechanism is not reliable...
1422 * maybe we should obsolete older versions.
1423 */
1424 qtype = NI_QTYPE_FQDN;
1425 /* will append an mbuf */
1426 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1427 oldfqdn++;
1428 break;
1429 }
1430
1431 /* allocate an mbuf to reply. */
1432 MGETHDR(n, M_DONTWAIT, m->m_type);
1433 if (n == NULL) {
1434 goto bad;
1435 }
1436 m_move_pkthdr(n, m);
1437 if (replylen > MHLEN) {
1438 if (replylen > MCLBYTES) {
1439 /*
1440 * XXX: should we try to allocate more? But MCLBYTES
1441 * is probably much larger than IPV6_MMTU...
1442 */
1443 goto bad;
1444 }
1445 MCLGET(n, M_DONTWAIT);
1446 if ((n->m_flags & M_EXT) == 0) {
1447 goto bad;
1448 }
1449 }
1450 n->m_pkthdr.len = n->m_len = replylen;
1451
1452 /* copy mbuf header and IPv6 + Node Information base headers */
1453 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr));
1454 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1455 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo));
1456
1457 /* qtype dependent procedure */
1458 switch (qtype) {
1459 case NI_QTYPE_NOOP:
1460 nni6->ni_code = ICMP6_NI_SUCCESS;
1461 nni6->ni_flags = 0;
1462 break;
1463 case NI_QTYPE_SUPTYPES:
1464 {
1465 u_int32_t v;
1466 nni6->ni_code = ICMP6_NI_SUCCESS;
1467 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1468 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1469 v = (u_int32_t)htonl(0x0000000f);
1470 memcpy(nni6 + 1, &v, sizeof(u_int32_t));
1471 break;
1472 }
1473 case NI_QTYPE_FQDN:
1474 nni6->ni_code = ICMP6_NI_SUCCESS;
1475 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) +
1476 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1477 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1478 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1479 /*
1480 * XXX do we really have FQDN in variable "hostname"?
1481 */
1482 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1483 if (n->m_next == NULL)
1484 goto bad;
1485 /* XXX we assume that n->m_next is not a chain */
1486 if (n->m_next->m_next != NULL)
1487 goto bad;
1488 n->m_pkthdr.len += n->m_next->m_len;
1489 break;
1490 case NI_QTYPE_NODEADDR:
1491 {
1492 int lenlim, copied;
1493
1494 nni6->ni_code = ICMP6_NI_SUCCESS;
1495 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1496 sizeof(struct icmp6_nodeinfo);
1497 lenlim = M_TRAILINGSPACE(n);
1498 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1499 if_put(ifp, &psref);
1500 ifp = NULL;
1501 /* update mbuf length */
1502 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1503 sizeof(struct icmp6_nodeinfo) + copied;
1504 break;
1505 }
1506 default:
1507 panic("%s: impossible", __func__);
1508 break;
1509 }
1510
1511 nni6->ni_type = ICMP6_NI_REPLY;
1512 m_freem(m);
1513 return n;
1514
1515 bad:
1516 if_put(ifp, &psref);
1517 m_freem(m);
1518 m_freem(n);
1519 return NULL;
1520 }
1521
1522 #define isupper(x) ('A' <= (x) && (x) <= 'Z')
1523 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
1524 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9'))
1525 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x))
1526
1527 /*
1528 * make a mbuf with DNS-encoded string. no compression support.
1529 *
1530 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1531 * treated as truncated name (two \0 at the end). this is a wild guess.
1532 *
1533 * old - return pascal string if non-zero
1534 */
1535 static struct mbuf *
ni6_nametodns(const char * name,int namelen,int old)1536 ni6_nametodns(const char *name, int namelen, int old)
1537 {
1538 struct mbuf *m;
1539 char *cp, *ep;
1540 const char *p, *q;
1541 int i, len, nterm;
1542
1543 if (old)
1544 len = namelen + 1;
1545 else
1546 len = MCLBYTES;
1547
1548 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1549 MGET(m, M_DONTWAIT, MT_DATA);
1550 if (m && len > MLEN) {
1551 MCLGET(m, M_DONTWAIT);
1552 if ((m->m_flags & M_EXT) == 0)
1553 goto fail;
1554 }
1555 if (!m)
1556 goto fail;
1557 m->m_next = NULL;
1558
1559 if (old) {
1560 m->m_len = len;
1561 *mtod(m, char *) = namelen;
1562 memcpy(mtod(m, char *) + 1, name, namelen);
1563 return m;
1564 } else {
1565 m->m_len = 0;
1566 cp = mtod(m, char *);
1567 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1568
1569 /* if not certain about my name, return empty buffer */
1570 if (namelen == 0)
1571 return m;
1572
1573 /*
1574 * guess if it looks like shortened hostname, or FQDN.
1575 * shortened hostname needs two trailing "\0".
1576 */
1577 i = 0;
1578 for (p = name; p < name + namelen; p++) {
1579 if (*p == '.')
1580 i++;
1581 }
1582 if (i < 2)
1583 nterm = 2;
1584 else
1585 nterm = 1;
1586
1587 p = name;
1588 while (cp < ep && p < name + namelen) {
1589 i = 0;
1590 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1591 i++;
1592 /* result does not fit into mbuf */
1593 if (cp + i + 1 >= ep)
1594 goto fail;
1595 /*
1596 * DNS label length restriction, RFC1035 page 8.
1597 * "i == 0" case is included here to avoid returning
1598 * 0-length label on "foo..bar".
1599 */
1600 if (i <= 0 || i >= 64)
1601 goto fail;
1602 *cp++ = i;
1603 if (!isalpha(p[0]) || !isalnum(p[i - 1]))
1604 goto fail;
1605 while (i > 0) {
1606 if (!isalnum(*p) && *p != '-')
1607 goto fail;
1608 if (isupper(*p)) {
1609 *cp++ = tolower(*p);
1610 p++;
1611 } else
1612 *cp++ = *p++;
1613 i--;
1614 }
1615 p = q;
1616 if (p < name + namelen && *p == '.')
1617 p++;
1618 }
1619 /* termination */
1620 if (cp + nterm >= ep)
1621 goto fail;
1622 while (nterm-- > 0)
1623 *cp++ = '\0';
1624 m->m_len = cp - mtod(m, char *);
1625 return m;
1626 }
1627
1628 panic("should not reach here");
1629 /* NOTREACHED */
1630
1631 fail:
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 SOOPT_TIMESTAMP(last->inp_socket->so_options))
1992 ip6_savecontrol(last, &opts, ip6, n);
1993 /* strip intermediate headers */
1994 m_adj(n, off);
1995 if (sbappendaddr(&last->inp_socket->so_rcv,
1996 sin6tosa(&rip6src), n, opts) == 0) {
1997 soroverflow(last->inp_socket);
1998 m_freem(n);
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 SOOPT_TIMESTAMP(last->inp_socket->so_options))
2019 ip6_savecontrol(last, &opts, ip6, m);
2020 /* strip intermediate headers */
2021 m_adj(m, off);
2022 if (sbappendaddr(&last->inp_socket->so_rcv,
2023 sin6tosa(&rip6src), m, opts) == 0) {
2024 soroverflow(last->inp_socket);
2025 m_freem(m);
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 m_freem(m0);
2703 m0 = NULL;
2704
2705 /* XXX: clear embedded link IDs in the inner header */
2706 in6_clearscope(&sip6->ip6_src);
2707 in6_clearscope(&sip6->ip6_dst);
2708 in6_clearscope(&nd_rd->nd_rd_target);
2709 in6_clearscope(&nd_rd->nd_rd_dst);
2710
2711 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2712
2713 nd_rd->nd_rd_cksum = 0;
2714 nd_rd->nd_rd_cksum =
2715 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2716
2717 /* send the packet to outside... */
2718 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0)
2719 icmp6_ifstat_inc(ifp, ifs6_out_error);
2720
2721 icmp6_ifstat_inc(ifp, ifs6_out_msg);
2722 icmp6_ifstat_inc(ifp, ifs6_out_redirect);
2723 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT);
2724
2725 return;
2726
2727 fail:
2728 m_freem(m);
2729 m_freem(m0);
2730 }
2731
2732 /*
2733 * ICMPv6 socket option processing.
2734 */
2735 int
icmp6_ctloutput(int op,struct socket * so,struct sockopt * sopt)2736 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
2737 {
2738 int error = 0;
2739 struct inpcb *inp = sotoinpcb(so);
2740
2741 if (sopt->sopt_level != IPPROTO_ICMPV6)
2742 return rip6_ctloutput(op, so, sopt);
2743
2744 switch (op) {
2745 case PRCO_SETOPT:
2746 switch (sopt->sopt_name) {
2747 case ICMP6_FILTER:
2748 {
2749 struct icmp6_filter fil;
2750
2751 error = sockopt_get(sopt, &fil, sizeof(fil));
2752 if (error)
2753 break;
2754 memcpy(in6p_icmp6filt(inp), &fil,
2755 sizeof(struct icmp6_filter));
2756 error = 0;
2757 break;
2758 }
2759
2760 default:
2761 error = ENOPROTOOPT;
2762 break;
2763 }
2764 break;
2765
2766 case PRCO_GETOPT:
2767 switch (sopt->sopt_name) {
2768 case ICMP6_FILTER:
2769 {
2770 if (in6p_icmp6filt(inp) == NULL) {
2771 error = EINVAL;
2772 break;
2773 }
2774 error = sockopt_set(sopt, in6p_icmp6filt(inp),
2775 sizeof(struct icmp6_filter));
2776 break;
2777 }
2778
2779 default:
2780 error = ENOPROTOOPT;
2781 break;
2782 }
2783 break;
2784 }
2785
2786 return error;
2787 }
2788
2789 /*
2790 * Perform rate limit check.
2791 * Returns 0 if it is okay to send the icmp6 packet.
2792 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2793 * limitation.
2794 *
2795 * XXX per-destination/type check necessary?
2796 */
2797 static int
icmp6_ratelimit(const struct in6_addr * dst,const int type,const int code)2798 icmp6_ratelimit(
2799 const struct in6_addr *dst, /* not used at this moment */
2800 const int type, /* not used at this moment */
2801 const int code) /* not used at this moment */
2802 {
2803 int ret;
2804
2805 ret = 0; /* okay to send */
2806
2807 /* PPS limit */
2808 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2809 icmp6errppslim)) {
2810 /* The packet is subject to rate limit */
2811 ret++;
2812 }
2813
2814 return ret;
2815 }
2816
2817 static struct rtentry *
icmp6_mtudisc_clone(struct sockaddr * dst)2818 icmp6_mtudisc_clone(struct sockaddr *dst)
2819 {
2820 struct rtentry *rt;
2821 int error;
2822
2823 rt = rtalloc1(dst, 1);
2824 if (rt == NULL)
2825 return NULL;
2826
2827 /* If we didn't get a host route, allocate one */
2828 if ((rt->rt_flags & RTF_HOST) == 0) {
2829 struct rtentry *nrt;
2830
2831 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL,
2832 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt);
2833 if (error) {
2834 rt_unref(rt);
2835 return NULL;
2836 }
2837 nrt->rt_rmx = rt->rt_rmx;
2838 rt_newmsg_dynamic(RTM_ADD, nrt);
2839 rt_unref(rt);
2840 rt = nrt;
2841 }
2842
2843 mutex_enter(&icmp6_mtx);
2844 error = rt_timer_add(rt, icmp6_mtudisc_timeout,
2845 icmp6_mtudisc_timeout_q);
2846 mutex_exit(&icmp6_mtx);
2847
2848 if (error) {
2849 rt_unref(rt);
2850 return NULL;
2851 }
2852
2853 return rt; /* caller need to call rtfree() */
2854 }
2855
2856 static void
icmp6_mtudisc_timeout(struct rtentry * rt,struct rttimer * r)2857 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r)
2858 {
2859 struct rtentry *retrt;
2860
2861 KASSERT(rt != NULL);
2862 rt_assert_referenced(rt);
2863
2864 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) ==
2865 (RTF_DYNAMIC | RTF_HOST)) {
2866 rtrequest(RTM_DELETE, rt_getkey(rt),
2867 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
2868 rt_newmsg_dynamic(RTM_DELETE, retrt);
2869 rt_unref(rt);
2870 rt_free(retrt);
2871 } else {
2872 if (!(rt->rt_rmx.rmx_locks & RTV_MTU))
2873 rt->rt_rmx.rmx_mtu = 0;
2874 }
2875 }
2876
2877 static void
icmp6_redirect_timeout(struct rtentry * rt,struct rttimer * r)2878 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r)
2879 {
2880 struct rtentry *retrt;
2881
2882 KASSERT(rt != NULL);
2883 rt_assert_referenced(rt);
2884
2885 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) ==
2886 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) {
2887 rtrequest(RTM_DELETE, rt_getkey(rt),
2888 rt->rt_gateway, rt_mask(rt), rt->rt_flags, &retrt);
2889 rt_newmsg_dynamic(RTM_DELETE, retrt);
2890 rt_unref(rt);
2891 rt_free(retrt);
2892 }
2893 }
2894
2895 static int
sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)2896 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS)
2897 {
2898
2899 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS));
2900 }
2901
2902 static int
sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)2903 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS)
2904 {
2905 int error, tmp;
2906 struct sysctlnode node;
2907
2908 mutex_enter(&icmp6_mtx);
2909
2910 node = *rnode;
2911 node.sysctl_data = &tmp;
2912 tmp = icmp6_redirtimeout;
2913 error = sysctl_lookup(SYSCTLFN_CALL(&node));
2914 if (error || newp == NULL)
2915 goto out;
2916 if (tmp < 0) {
2917 error = EINVAL;
2918 goto out;
2919 }
2920 icmp6_redirtimeout = tmp;
2921
2922 if (icmp6_redirect_timeout_q != NULL) {
2923 if (icmp6_redirtimeout == 0) {
2924 rt_timer_queue_destroy(icmp6_redirect_timeout_q);
2925 } else {
2926 rt_timer_queue_change(icmp6_redirect_timeout_q,
2927 icmp6_redirtimeout);
2928 }
2929 } else if (icmp6_redirtimeout > 0) {
2930 icmp6_redirect_timeout_q =
2931 rt_timer_queue_create(icmp6_redirtimeout);
2932 }
2933 error = 0;
2934 out:
2935 mutex_exit(&icmp6_mtx);
2936 return error;
2937 }
2938
2939 static void
sysctl_net_inet6_icmp6_setup(struct sysctllog ** clog)2940 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog)
2941 {
2942
2943 sysctl_createv(clog, 0, NULL, NULL,
2944 CTLFLAG_PERMANENT,
2945 CTLTYPE_NODE, "inet6", NULL,
2946 NULL, 0, NULL, 0,
2947 CTL_NET, PF_INET6, CTL_EOL);
2948 sysctl_createv(clog, 0, NULL, NULL,
2949 CTLFLAG_PERMANENT,
2950 CTLTYPE_NODE, "icmp6",
2951 SYSCTL_DESCR("ICMPv6 related settings"),
2952 NULL, 0, NULL, 0,
2953 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL);
2954
2955 sysctl_createv(clog, 0, NULL, NULL,
2956 CTLFLAG_PERMANENT,
2957 CTLTYPE_STRUCT, "stats",
2958 SYSCTL_DESCR("ICMPv6 transmission statistics"),
2959 sysctl_net_inet6_icmp6_stats, 0, NULL, 0,
2960 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2961 ICMPV6CTL_STATS, CTL_EOL);
2962 sysctl_createv(clog, 0, NULL, NULL,
2963 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2964 CTLTYPE_INT, "rediraccept",
2965 SYSCTL_DESCR("Accept and process redirect messages"),
2966 NULL, 0, &icmp6_rediraccept, 0,
2967 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2968 ICMPV6CTL_REDIRACCEPT, CTL_EOL);
2969 sysctl_createv(clog, 0, NULL, NULL,
2970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2971 CTLTYPE_INT, "redirtimeout",
2972 SYSCTL_DESCR("Redirect generated route lifetime"),
2973 sysctl_net_inet6_icmp6_redirtimeout, 0,
2974 &icmp6_redirtimeout, 0,
2975 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2976 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL);
2977 #if 0 /* obsoleted */
2978 sysctl_createv(clog, 0, NULL, NULL,
2979 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2980 CTLTYPE_INT, "errratelimit", NULL,
2981 NULL, 0, &icmp6_errratelimit, 0,
2982 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2983 ICMPV6CTL_ERRRATELIMIT, CTL_EOL);
2984 #endif
2985 sysctl_createv(clog, 0, NULL, NULL,
2986 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2987 CTLTYPE_INT, "nd6_prune",
2988 SYSCTL_DESCR("Neighbor discovery prune interval"),
2989 NULL, 0, &nd6_prune, 0,
2990 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2991 ICMPV6CTL_ND6_PRUNE, CTL_EOL);
2992 sysctl_createv(clog, 0, NULL, NULL,
2993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2994 CTLTYPE_INT, "nd6_delay",
2995 SYSCTL_DESCR("First probe delay time"),
2996 NULL, 0, &nd6_nd_domain.nd_delay, 0,
2997 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
2998 ICMPV6CTL_ND6_DELAY, CTL_EOL);
2999 sysctl_createv(clog, 0, NULL, NULL,
3000 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3001 CTLTYPE_INT, "nd6_mmaxtries",
3002 SYSCTL_DESCR("Number of multicast discovery attempts"),
3003 NULL, 0, &nd6_nd_domain.nd_mmaxtries, 0,
3004 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3005 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL);
3006 sysctl_createv(clog, 0, NULL, NULL,
3007 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3008 CTLTYPE_INT, "nd6_umaxtries",
3009 SYSCTL_DESCR("Number of unicast discovery attempts"),
3010 NULL, 0, &nd6_nd_domain.nd_umaxtries, 0,
3011 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3012 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL);
3013 sysctl_createv(clog, 0, NULL, NULL,
3014 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3015 CTLTYPE_INT, "nd6_maxnudhint",
3016 SYSCTL_DESCR("Maximum neighbor unreachable hint count"),
3017 NULL, 0, &nd6_nd_domain.nd_maxnudhint, 0,
3018 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3019 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL);
3020 sysctl_createv(clog, 0, NULL, NULL,
3021 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3022 CTLTYPE_INT, "maxqueuelen",
3023 SYSCTL_DESCR("max packet queue len for a unresolved ND"),
3024 NULL, 1, &nd6_nd_domain.nd_maxqueuelen, 0,
3025 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3026 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL);
3027 sysctl_createv(clog, 0, NULL, NULL,
3028 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3029 CTLTYPE_INT, "nd6_useloopback",
3030 SYSCTL_DESCR("Use loopback interface for local traffic"),
3031 NULL, 0, &nd6_useloopback, 0,
3032 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3033 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL);
3034 #if 0 /* obsoleted */
3035 sysctl_createv(clog, 0, NULL, NULL,
3036 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3037 CTLTYPE_INT, "nd6_proxyall", NULL,
3038 NULL, 0, &nd6_proxyall, 0,
3039 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3040 ICMPV6CTL_ND6_PROXYALL, CTL_EOL);
3041 #endif
3042 sysctl_createv(clog, 0, NULL, NULL,
3043 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3044 CTLTYPE_INT, "nodeinfo",
3045 SYSCTL_DESCR("Respond to node information requests"),
3046 NULL, 0, &icmp6_nodeinfo, 0,
3047 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3048 ICMPV6CTL_NODEINFO, CTL_EOL);
3049 sysctl_createv(clog, 0, NULL, NULL,
3050 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3051 CTLTYPE_INT, "errppslimit",
3052 SYSCTL_DESCR("Maximum ICMP errors sent per second"),
3053 NULL, 0, &icmp6errppslim, 0,
3054 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3055 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL);
3056 sysctl_createv(clog, 0, NULL, NULL,
3057 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3058 CTLTYPE_INT, "mtudisc_hiwat",
3059 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
3060 NULL, 0, &icmp6_mtudisc_hiwat, 0,
3061 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3062 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL);
3063 sysctl_createv(clog, 0, NULL, NULL,
3064 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3065 CTLTYPE_INT, "mtudisc_lowat",
3066 SYSCTL_DESCR("Low mark on MTU Discovery route timers"),
3067 NULL, 0, &icmp6_mtudisc_lowat, 0,
3068 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3069 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL);
3070 sysctl_createv(clog, 0, NULL, NULL,
3071 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3072 CTLTYPE_INT, "nd6_debug",
3073 SYSCTL_DESCR("Enable neighbor discovery debug output"),
3074 NULL, 0, &nd6_debug, 0,
3075 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3076 ICMPV6CTL_ND6_DEBUG, CTL_EOL);
3077 sysctl_createv(clog, 0, NULL, NULL,
3078 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3079 CTLTYPE_BOOL, "reflect_pmtu",
3080 SYSCTL_DESCR("Use path MTU Discovery for icmpv6 reflect"),
3081 NULL, 0, &icmp6_reflect_pmtu, 0,
3082 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3083 ICMPV6CTL_REFLECT_PMTU, CTL_EOL);
3084 sysctl_createv(clog, 0, NULL, NULL,
3085 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
3086 CTLTYPE_BOOL, "dynamic_rt_msg",
3087 SYSCTL_DESCR("Send routing message for RTF_DYNAMIC"),
3088 NULL, 0, &icmp6_dynamic_rt_msg, 0,
3089 CTL_NET, PF_INET6, IPPROTO_ICMPV6,
3090 ICMPV6CTL_DYNAMIC_RT_MSG, CTL_EOL);
3091 }
3092
3093 void
icmp6_statinc(u_int stat)3094 icmp6_statinc(u_int stat)
3095 {
3096
3097 KASSERT(stat < ICMP6_NSTATS);
3098 ICMP6_STATINC(stat);
3099 }
3100