1 | /* |
2 | * Copyright (c) 2000-2018 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | |
29 | /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */ |
30 | /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ |
31 | |
32 | /* |
33 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
34 | * All rights reserved. |
35 | * |
36 | * Redistribution and use in source and binary forms, with or without |
37 | * modification, are permitted provided that the following conditions |
38 | * are met: |
39 | * 1. Redistributions of source code must retain the above copyright |
40 | * notice, this list of conditions and the following disclaimer. |
41 | * 2. Redistributions in binary form must reproduce the above copyright |
42 | * notice, this list of conditions and the following disclaimer in the |
43 | * documentation and/or other materials provided with the distribution. |
44 | * 3. Neither the name of the project nor the names of its contributors |
45 | * may be used to endorse or promote products derived from this software |
46 | * without specific prior written permission. |
47 | * |
48 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
58 | * SUCH DAMAGE. |
59 | */ |
60 | |
61 | /* |
62 | * Copyright (c) 1982, 1986, 1988, 1993 |
63 | * The Regents of the University of California. All rights reserved. |
64 | * |
65 | * Redistribution and use in source and binary forms, with or without |
66 | * modification, are permitted provided that the following conditions |
67 | * are met: |
68 | * 1. Redistributions of source code must retain the above copyright |
69 | * notice, this list of conditions and the following disclaimer. |
70 | * 2. Redistributions in binary form must reproduce the above copyright |
71 | * notice, this list of conditions and the following disclaimer in the |
72 | * documentation and/or other materials provided with the distribution. |
73 | * 3. All advertising materials mentioning features or use of this software |
74 | * must display the following acknowledgement: |
75 | * This product includes software developed by the University of |
76 | * California, Berkeley and its contributors. |
77 | * 4. Neither the name of the University nor the names of its contributors |
78 | * may be used to endorse or promote products derived from this software |
79 | * without specific prior written permission. |
80 | * |
81 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
82 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
83 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
84 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
85 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
86 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
87 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
88 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
89 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
90 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
91 | * SUCH DAMAGE. |
92 | * |
93 | * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 |
94 | */ |
95 | |
96 | |
97 | #include <sys/param.h> |
98 | #include <sys/systm.h> |
99 | #include <sys/lock.h> |
100 | #include <sys/malloc.h> |
101 | #include <sys/mcache.h> |
102 | #include <sys/mbuf.h> |
103 | #include <sys/protosw.h> |
104 | #include <sys/socket.h> |
105 | #include <sys/socketvar.h> |
106 | #include <sys/time.h> |
107 | #include <sys/kernel.h> |
108 | #include <sys/syslog.h> |
109 | #include <sys/domain.h> |
110 | #include <sys/kauth.h> |
111 | |
112 | #include <net/if.h> |
113 | #include <net/route.h> |
114 | #include <net/if_dl.h> |
115 | #include <net/if_types.h> |
116 | |
117 | #include <netinet/in.h> |
118 | #include <netinet/in_var.h> |
119 | #include <netinet/ip6.h> |
120 | #include <netinet6/ip6_var.h> |
121 | #include <netinet/icmp6.h> |
122 | #include <netinet6/mld6_var.h> |
123 | #include <netinet/in_pcb.h> |
124 | #include <netinet6/in6_pcb.h> |
125 | #include <netinet6/in6_var.h> |
126 | #include <netinet6/nd6.h> |
127 | #include <netinet6/in6_ifattach.h> |
128 | #include <netinet6/ip6protosw.h> |
129 | #include <netinet6/scope6_var.h> |
130 | |
131 | #if IPSEC |
132 | #include <netinet6/ipsec.h> |
133 | #include <netkey/key.h> |
134 | #endif |
135 | |
136 | #include <net/net_osdep.h> |
137 | |
138 | #if NECP |
139 | #include <net/necp.h> |
140 | #endif |
141 | |
142 | extern struct ip6protosw *ip6_protox[]; |
143 | |
144 | extern uint32_t rip_sendspace; |
145 | extern uint32_t rip_recvspace; |
146 | |
147 | struct icmp6stat icmp6stat; |
148 | |
149 | extern struct inpcbhead ripcb; |
150 | extern int icmp6errppslim; |
151 | extern int icmp6rappslim; |
152 | static int icmp6errpps_count = 0; |
153 | static int icmp6rapps_count = 0; |
154 | static struct timeval icmp6errppslim_last; |
155 | static struct timeval icmp6rappslim_last; |
156 | extern int icmp6_nodeinfo; |
157 | extern struct inpcbinfo ripcbinfo; |
158 | |
159 | static void icmp6_errcount(struct icmp6errstat *, int, int); |
160 | static int icmp6_rip6_input(struct mbuf **, int); |
161 | static int icmp6_ratelimit(const struct in6_addr *, const int, const int); |
162 | static const char *icmp6_redirect_diag(struct in6_addr *, |
163 | struct in6_addr *, struct in6_addr *); |
164 | static struct mbuf *ni6_input(struct mbuf *, int); |
165 | static struct mbuf *ni6_nametodns(const char *, int, int); |
166 | static int ni6_dnsmatch(const char *, int, const char *, int); |
167 | static int ni6_addrs(struct icmp6_nodeinfo *, |
168 | struct ifnet **, char *); |
169 | static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, |
170 | struct ifnet *, int); |
171 | static int icmp6_notify_error(struct mbuf *, int, int, int); |
172 | |
173 | |
174 | |
175 | void |
176 | icmp6_init(struct ip6protosw *pp, struct domain *dp) |
177 | { |
178 | #pragma unused(dp) |
179 | static int icmp6_initialized = 0; |
180 | |
181 | /* Also called from ip6_init() without pp */ |
182 | VERIFY(pp == NULL || |
183 | (pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); |
184 | |
185 | /* This gets called by more than one protocols, so initialize once */ |
186 | if (!icmp6_initialized) { |
187 | icmp6_initialized = 1; |
188 | mld_init(); |
189 | } |
190 | } |
191 | |
192 | static void |
193 | icmp6_errcount(struct icmp6errstat *stat, int type, int code) |
194 | { |
195 | switch (type) { |
196 | case ICMP6_DST_UNREACH: |
197 | switch (code) { |
198 | case ICMP6_DST_UNREACH_NOROUTE: |
199 | stat->icp6errs_dst_unreach_noroute++; |
200 | return; |
201 | case ICMP6_DST_UNREACH_ADMIN: |
202 | stat->icp6errs_dst_unreach_admin++; |
203 | return; |
204 | case ICMP6_DST_UNREACH_BEYONDSCOPE: |
205 | stat->icp6errs_dst_unreach_beyondscope++; |
206 | return; |
207 | case ICMP6_DST_UNREACH_ADDR: |
208 | stat->icp6errs_dst_unreach_addr++; |
209 | return; |
210 | case ICMP6_DST_UNREACH_NOPORT: |
211 | stat->icp6errs_dst_unreach_noport++; |
212 | return; |
213 | } |
214 | break; |
215 | case ICMP6_PACKET_TOO_BIG: |
216 | stat->icp6errs_packet_too_big++; |
217 | return; |
218 | case ICMP6_TIME_EXCEEDED: |
219 | switch (code) { |
220 | case ICMP6_TIME_EXCEED_TRANSIT: |
221 | stat->icp6errs_time_exceed_transit++; |
222 | return; |
223 | case ICMP6_TIME_EXCEED_REASSEMBLY: |
224 | stat->icp6errs_time_exceed_reassembly++; |
225 | return; |
226 | } |
227 | break; |
228 | case ICMP6_PARAM_PROB: |
229 | switch (code) { |
230 | case ICMP6_PARAMPROB_HEADER: |
231 | stat->icp6errs_paramprob_header++; |
232 | return; |
233 | case ICMP6_PARAMPROB_NEXTHEADER: |
234 | stat->icp6errs_paramprob_nextheader++; |
235 | return; |
236 | case ICMP6_PARAMPROB_OPTION: |
237 | stat->icp6errs_paramprob_option++; |
238 | return; |
239 | } |
240 | break; |
241 | case ND_REDIRECT: |
242 | stat->icp6errs_redirect++; |
243 | return; |
244 | } |
245 | stat->icp6errs_unknown++; |
246 | } |
247 | |
248 | /* |
249 | * A wrapper function for icmp6_error() necessary when the erroneous packet |
250 | * may not contain enough scope zone information. |
251 | */ |
252 | void |
253 | icmp6_error2(struct mbuf *m, int type, int code, int param, |
254 | struct ifnet *ifp) |
255 | { |
256 | struct ip6_hdr *ip6; |
257 | |
258 | if (ifp == NULL) |
259 | return; |
260 | |
261 | #ifndef PULLDOWN_TEST |
262 | IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return ); |
263 | #else |
264 | if (m->m_len < sizeof(struct ip6_hdr)) { |
265 | m = m_pullup(m, sizeof(struct ip6_hdr)); |
266 | if (m == NULL) |
267 | return; |
268 | } |
269 | #endif |
270 | |
271 | ip6 = mtod(m, struct ip6_hdr *); |
272 | |
273 | if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) |
274 | return; |
275 | if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) |
276 | return; |
277 | |
278 | icmp6_error(m, type, code, param); |
279 | } |
280 | |
281 | /* |
282 | * Generate an error packet of type error in response to bad IP6 packet. |
283 | */ |
284 | void |
285 | icmp6_error(struct mbuf *m, int type, int code, int param) { |
286 | icmp6_error_flag(m, type, code, param, ICMP6_ERROR_RST_MRCVIF); |
287 | } |
288 | |
289 | void icmp6_error_flag (struct mbuf *m, int type, int code, int param, int flags) |
290 | { |
291 | struct ip6_hdr *oip6, *nip6; |
292 | struct icmp6_hdr *icmp6; |
293 | u_int preplen; |
294 | int off; |
295 | int nxt; |
296 | |
297 | icmp6stat.icp6s_error++; |
298 | |
299 | /* count per-type-code statistics */ |
300 | icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); |
301 | |
302 | #ifdef M_DECRYPTED /*not openbsd*/ |
303 | if (m->m_flags & M_DECRYPTED) { |
304 | icmp6stat.icp6s_canterror++; |
305 | goto freeit; |
306 | } |
307 | #endif |
308 | |
309 | #ifndef PULLDOWN_TEST |
310 | IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return); |
311 | #else |
312 | if (m->m_len < sizeof(struct ip6_hdr)) { |
313 | m = m_pullup(m, sizeof(struct ip6_hdr)); |
314 | if (m == NULL) |
315 | return; |
316 | } |
317 | #endif |
318 | oip6 = mtod(m, struct ip6_hdr *); |
319 | |
320 | /* |
321 | * If the destination address of the erroneous packet is a multicast |
322 | * address, or the packet was sent using link-layer multicast, |
323 | * we should basically suppress sending an error (RFC 2463, Section |
324 | * 2.4). |
325 | * We have two exceptions (the item e.2 in that section): |
326 | * - the Pakcet Too Big message can be sent for path MTU discovery. |
327 | * - the Parameter Problem Message that can be allowed an icmp6 error |
328 | * in the option type field. This check has been done in |
329 | * ip6_unknown_opt(), so we can just check the type and code. |
330 | */ |
331 | if ((m->m_flags & (M_BCAST|M_MCAST) || |
332 | IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && |
333 | (type != ICMP6_PACKET_TOO_BIG && |
334 | (type != ICMP6_PARAM_PROB || |
335 | code != ICMP6_PARAMPROB_OPTION))) |
336 | goto freeit; |
337 | |
338 | /* |
339 | * RFC 2463, 2.4 (e.5): source address check. |
340 | * XXX: the case of anycast source? |
341 | */ |
342 | if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || |
343 | IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) |
344 | goto freeit; |
345 | |
346 | /* |
347 | * If we are about to send ICMPv6 against ICMPv6 error/redirect, |
348 | * don't do it. |
349 | */ |
350 | nxt = -1; |
351 | off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); |
352 | if (off >= 0 && nxt == IPPROTO_ICMPV6) { |
353 | struct icmp6_hdr *icp; |
354 | |
355 | #ifndef PULLDOWN_TEST |
356 | IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return); |
357 | icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); |
358 | #else |
359 | IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, |
360 | sizeof(*icp)); |
361 | if (icp == NULL) { |
362 | icmp6stat.icp6s_tooshort++; |
363 | return; |
364 | } |
365 | #endif |
366 | if (icp->icmp6_type < ICMP6_ECHO_REQUEST || |
367 | icp->icmp6_type == ND_REDIRECT) { |
368 | /* |
369 | * ICMPv6 error |
370 | * Special case: for redirect (which is |
371 | * informational) we must not send icmp6 error. |
372 | */ |
373 | icmp6stat.icp6s_canterror++; |
374 | goto freeit; |
375 | } else { |
376 | /* ICMPv6 informational - send the error */ |
377 | } |
378 | } else { |
379 | /* non-ICMPv6 - send the error */ |
380 | } |
381 | |
382 | oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ |
383 | |
384 | /* Finally, do rate limitation check. */ |
385 | if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { |
386 | icmp6stat.icp6s_toofreq++; |
387 | goto freeit; |
388 | } |
389 | |
390 | /* |
391 | * OK, ICMP6 can be generated. |
392 | */ |
393 | |
394 | if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) |
395 | m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); |
396 | |
397 | preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
398 | M_PREPEND(m, preplen, M_DONTWAIT, 1); |
399 | if (m && m->m_len < preplen) |
400 | m = m_pullup(m, preplen); |
401 | if (m == NULL) { |
402 | nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n" , __LINE__)); |
403 | return; |
404 | } |
405 | |
406 | nip6 = mtod(m, struct ip6_hdr *); |
407 | nip6->ip6_src = oip6->ip6_src; |
408 | nip6->ip6_dst = oip6->ip6_dst; |
409 | |
410 | in6_clearscope(&oip6->ip6_src); |
411 | in6_clearscope(&oip6->ip6_dst); |
412 | |
413 | icmp6 = (struct icmp6_hdr *)(nip6 + 1); |
414 | icmp6->icmp6_type = type; |
415 | icmp6->icmp6_code = code; |
416 | icmp6->icmp6_pptr = htonl((u_int32_t)param); |
417 | |
418 | /* |
419 | * icmp6_reflect() is designed to be in the input path. |
420 | * icmp6_error() can be called from both input and output path, |
421 | * and if we are in output path rcvif could contain bogus value. |
422 | * clear m->m_pkthdr.rcvif for safety, we should have enough scope |
423 | * information in ip header (nip6). |
424 | */ |
425 | if (flags & ICMP6_ERROR_RST_MRCVIF) { |
426 | m->m_pkthdr.rcvif = NULL; |
427 | } |
428 | |
429 | icmp6stat.icp6s_outhist[type]++; |
430 | icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ |
431 | |
432 | return; |
433 | |
434 | freeit: |
435 | /* |
436 | * If we can't tell whether or not we can generate ICMP6, free it. |
437 | */ |
438 | m_freem(m); |
439 | } |
440 | |
441 | /* |
442 | * Process a received ICMP6 message. |
443 | */ |
444 | int |
445 | icmp6_input(struct mbuf **mp, int *offp, int proto) |
446 | { |
447 | #pragma unused(proto) |
448 | struct mbuf *m = *mp, *n; |
449 | struct ifnet *ifp; |
450 | struct ip6_hdr *ip6, *nip6; |
451 | struct icmp6_hdr *icmp6, *nicmp6; |
452 | int off = *offp; |
453 | int icmp6len = m->m_pkthdr.len - *offp; |
454 | int code, sum, noff, proxy = 0; |
455 | |
456 | ifp = m->m_pkthdr.rcvif; |
457 | |
458 | #ifndef PULLDOWN_TEST |
459 | IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE); |
460 | /* m might change if M_LOOP. So, call mtod after this */ |
461 | #endif |
462 | |
463 | /* Expect 32-bit aligned data pointer on strict-align platforms */ |
464 | MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); |
465 | |
466 | /* |
467 | * Locate icmp6 structure in mbuf, and check |
468 | * that not corrupted and of at least minimum length |
469 | */ |
470 | ip6 = mtod(m, struct ip6_hdr *); |
471 | if (icmp6len < sizeof(struct icmp6_hdr)) { |
472 | icmp6stat.icp6s_tooshort++; |
473 | goto freeit; |
474 | } |
475 | |
476 | #ifndef PULLDOWN_TEST |
477 | icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); |
478 | #else |
479 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); |
480 | if (icmp6 == NULL) { |
481 | icmp6stat.icp6s_tooshort++; |
482 | return IPPROTO_DONE; |
483 | } |
484 | #endif |
485 | code = icmp6->icmp6_code; |
486 | |
487 | /* |
488 | * Early check for RFC 6980 |
489 | * Drop certain NDP packets if they came in fragmented |
490 | */ |
491 | switch (icmp6->icmp6_type) { |
492 | case ND_ROUTER_SOLICIT: |
493 | case ND_ROUTER_ADVERT: |
494 | case ND_NEIGHBOR_SOLICIT: |
495 | case ND_NEIGHBOR_ADVERT: |
496 | case ND_REDIRECT: |
497 | if (m->m_pkthdr.pkt_flags & PKTF_REASSEMBLED) { |
498 | icmp6stat.icp6s_rfc6980_drop++; |
499 | goto freeit; |
500 | } |
501 | break; |
502 | default: |
503 | break; |
504 | } |
505 | |
506 | /* Apply rate limit before checksum validation. */ |
507 | if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { |
508 | icmp6stat.icp6s_toofreq++; |
509 | goto freeit; |
510 | } |
511 | |
512 | /* |
513 | * Check multicast group membership. |
514 | * Note: SSM filters are not applied for ICMPv6 traffic. |
515 | */ |
516 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
517 | struct in6_multi *inm; |
518 | |
519 | in6_multihead_lock_shared(); |
520 | IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm); |
521 | in6_multihead_lock_done(); |
522 | |
523 | if (inm == NULL) { |
524 | /* |
525 | * Don't discard if this is a Neighbor Solicitation |
526 | * that needs to be proxied (see check down below.) |
527 | */ |
528 | if (!(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)) { |
529 | ip6stat.ip6s_notmember++; |
530 | in6_ifstat_inc(m->m_pkthdr.rcvif, |
531 | ifs6_in_discard); |
532 | goto freeit; |
533 | } |
534 | } else { |
535 | IN6M_REMREF(inm); |
536 | } |
537 | } |
538 | |
539 | /* |
540 | * calculate the checksum |
541 | */ |
542 | if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { |
543 | nd6log((LOG_ERR, |
544 | "ICMP6 checksum error(%d|%x) %s\n" , |
545 | icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); |
546 | icmp6stat.icp6s_checksum++; |
547 | goto freeit; |
548 | } |
549 | |
550 | if (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST) { |
551 | /* |
552 | * This is the special case of proxying NS (dst is either |
553 | * solicited-node multicast or unicast); process it locally |
554 | * but don't deliver it to sockets. It practically lets us |
555 | * steer the packet to nd6_prproxy_ns_input, where more |
556 | * specific tests and actions will be taken. |
557 | */ |
558 | switch (icmp6->icmp6_type) { |
559 | case ND_NEIGHBOR_SOLICIT: |
560 | proxy = 1; |
561 | break; |
562 | default: |
563 | goto freeit; |
564 | } |
565 | } |
566 | |
567 | icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; |
568 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); |
569 | if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) |
570 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); |
571 | |
572 | switch (icmp6->icmp6_type) { |
573 | case ICMP6_DST_UNREACH: |
574 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); |
575 | switch (code) { |
576 | case ICMP6_DST_UNREACH_NOROUTE: |
577 | case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */ |
578 | code = PRC_UNREACH_NET; |
579 | break; |
580 | case ICMP6_DST_UNREACH_ADMIN: |
581 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); |
582 | code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ |
583 | break; |
584 | case ICMP6_DST_UNREACH_BEYONDSCOPE: |
585 | /* I mean "source address was incorrect." */ |
586 | code = PRC_PARAMPROB; |
587 | break; |
588 | case ICMP6_DST_UNREACH_NOPORT: |
589 | code = PRC_UNREACH_PORT; |
590 | break; |
591 | default: |
592 | goto badcode; |
593 | } |
594 | goto deliver; |
595 | |
596 | case ICMP6_PACKET_TOO_BIG: |
597 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); |
598 | |
599 | code = PRC_MSGSIZE; |
600 | |
601 | /* |
602 | * Updating the path MTU will be done after examining |
603 | * intermediate extension headers. |
604 | */ |
605 | goto deliver; |
606 | |
607 | case ICMP6_TIME_EXCEEDED: |
608 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); |
609 | switch (code) { |
610 | case ICMP6_TIME_EXCEED_TRANSIT: |
611 | code = PRC_TIMXCEED_INTRANS; |
612 | break; |
613 | case ICMP6_TIME_EXCEED_REASSEMBLY: |
614 | code = PRC_TIMXCEED_REASS; |
615 | break; |
616 | default: |
617 | goto badcode; |
618 | } |
619 | goto deliver; |
620 | |
621 | case ICMP6_PARAM_PROB: |
622 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); |
623 | switch (code) { |
624 | case ICMP6_PARAMPROB_NEXTHEADER: |
625 | code = PRC_UNREACH_PROTOCOL; |
626 | break; |
627 | case ICMP6_PARAMPROB_HEADER: |
628 | case ICMP6_PARAMPROB_OPTION: |
629 | code = PRC_PARAMPROB; |
630 | break; |
631 | default: |
632 | goto badcode; |
633 | } |
634 | goto deliver; |
635 | |
636 | case ICMP6_ECHO_REQUEST: |
637 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); |
638 | if (code != 0) |
639 | goto badcode; |
640 | |
641 | if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { |
642 | /* Give up remote */ |
643 | goto rate_limit_checked; |
644 | } |
645 | if ((n->m_flags & M_EXT) != 0 |
646 | || n->m_len < off + sizeof(struct icmp6_hdr)) { |
647 | struct mbuf *n0 = n; |
648 | const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); |
649 | |
650 | /* |
651 | * Prepare an internal mbuf. m_pullup() doesn't |
652 | * always copy the length we specified. |
653 | */ |
654 | if (maxlen >= MCLBYTES) { |
655 | /* Give up remote */ |
656 | m_freem(n0); |
657 | goto rate_limit_checked; |
658 | } |
659 | MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */ |
660 | if (n && maxlen >= MHLEN) { |
661 | MCLGET(n, M_DONTWAIT); |
662 | if ((n->m_flags & M_EXT) == 0) { |
663 | m_free(n); |
664 | n = NULL; |
665 | } |
666 | } |
667 | if (n == NULL) { |
668 | /* Give up remote */ |
669 | m_freem(n0); |
670 | goto rate_limit_checked; |
671 | } |
672 | M_COPY_PKTHDR(n, n0); |
673 | /* |
674 | * Copy IPv6 and ICMPv6 only. |
675 | */ |
676 | nip6 = mtod(n, struct ip6_hdr *); |
677 | bcopy(ip6, nip6, sizeof(struct ip6_hdr)); |
678 | nicmp6 = (struct icmp6_hdr *)(nip6 + 1); |
679 | bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); |
680 | noff = sizeof(struct ip6_hdr); |
681 | n->m_pkthdr.len = n->m_len = |
682 | noff + sizeof(struct icmp6_hdr); |
683 | /* |
684 | * Adjust mbuf. ip6_plen will be adjusted in |
685 | * ip6_output(). |
686 | */ |
687 | m_adj(n0, off + sizeof(struct icmp6_hdr)); |
688 | n->m_pkthdr.len += n0->m_pkthdr.len; |
689 | n->m_next = n0; |
690 | n0->m_flags &= ~M_PKTHDR; |
691 | } else { |
692 | nip6 = mtod(n, struct ip6_hdr *); |
693 | IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, |
694 | sizeof(*nicmp6)); |
695 | noff = off; |
696 | } |
697 | if(nicmp6 == NULL) |
698 | panic("nicmp6 is NULL in %s, which isn't good!\n" , __FUNCTION__); |
699 | else { |
700 | nicmp6->icmp6_type = ICMP6_ECHO_REPLY; |
701 | nicmp6->icmp6_code = 0; |
702 | } |
703 | if (n) { |
704 | icmp6stat.icp6s_reflect++; |
705 | icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; |
706 | icmp6_reflect(n, noff); |
707 | } |
708 | goto rate_limit_checked; |
709 | |
710 | case ICMP6_ECHO_REPLY: |
711 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); |
712 | if (code != 0) |
713 | goto badcode; |
714 | break; |
715 | |
716 | case MLD_LISTENER_QUERY: |
717 | case MLD_LISTENER_REPORT: |
718 | |
719 | if (icmp6len < sizeof(struct mld_hdr)) |
720 | goto badlen; |
721 | if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ |
722 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); |
723 | else |
724 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); |
725 | |
726 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
727 | /* give up local */ |
728 | if (mld_input(m, off, icmp6len) == IPPROTO_DONE) |
729 | m = NULL; |
730 | goto freeit; |
731 | } |
732 | if (mld_input(n, off, icmp6len) != IPPROTO_DONE) |
733 | m_freem(n); |
734 | /* m stays. */ |
735 | goto rate_limit_checked; |
736 | |
737 | case MLD_LISTENER_DONE: |
738 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); |
739 | if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ |
740 | goto badlen; |
741 | break; /* nothing to be done in kernel */ |
742 | |
743 | case MLD_MTRACE_RESP: |
744 | case MLD_MTRACE: |
745 | /* XXX: these two are experimental. not officially defined. */ |
746 | /* XXX: per-interface statistics? */ |
747 | break; /* just pass it to applications */ |
748 | |
749 | case ICMP6_NI_QUERY: |
750 | if (!icmp6_nodeinfo) |
751 | break; |
752 | //### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not. |
753 | /* By RFC 4620 refuse to answer queries from global scope addresses */ |
754 | if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL) |
755 | break; |
756 | |
757 | if (icmp6len < sizeof(struct icmp6_nodeinfo)) |
758 | goto badlen; |
759 | |
760 | #ifndef PULLDOWN_TEST |
761 | IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), |
762 | return IPPROTO_DONE); |
763 | #endif |
764 | |
765 | n = m_copy(m, 0, M_COPYALL); |
766 | if (n) |
767 | n = ni6_input(n, off); |
768 | if (n) { |
769 | noff = sizeof(struct ip6_hdr); |
770 | icmp6stat.icp6s_reflect++; |
771 | icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; |
772 | icmp6_reflect(n, noff); |
773 | } |
774 | goto rate_limit_checked; |
775 | |
776 | case ICMP6_WRUREPLY: |
777 | if (code != 0) |
778 | goto badcode; |
779 | break; |
780 | |
781 | case ND_ROUTER_SOLICIT: |
782 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); |
783 | if (code != 0) |
784 | goto badcode; |
785 | if (icmp6len < sizeof(struct nd_router_solicit)) |
786 | goto badlen; |
787 | |
788 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
789 | /* give up local */ |
790 | nd6_rs_input(m, off, icmp6len); |
791 | m = NULL; |
792 | goto freeit; |
793 | } |
794 | nd6_rs_input(n, off, icmp6len); |
795 | /* m stays. */ |
796 | goto rate_limit_checked; |
797 | |
798 | case ND_ROUTER_ADVERT: |
799 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); |
800 | if (code != 0) |
801 | goto badcode; |
802 | if (icmp6len < sizeof(struct nd_router_advert)) |
803 | goto badlen; |
804 | |
805 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
806 | /* give up local */ |
807 | nd6_ra_input(m, off, icmp6len); |
808 | m = NULL; |
809 | goto freeit; |
810 | } |
811 | nd6_ra_input(n, off, icmp6len); |
812 | /* m stays. */ |
813 | goto rate_limit_checked; |
814 | |
815 | case ND_NEIGHBOR_SOLICIT: |
816 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); |
817 | if (code != 0) |
818 | goto badcode; |
819 | if (icmp6len < sizeof(struct nd_neighbor_solicit)) |
820 | goto badlen; |
821 | |
822 | if (proxy || |
823 | ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL)) { |
824 | /* give up local */ |
825 | nd6_ns_input(m, off, icmp6len); |
826 | m = NULL; |
827 | goto freeit; |
828 | } |
829 | nd6_ns_input(n, off, icmp6len); |
830 | /* m stays. */ |
831 | goto rate_limit_checked; |
832 | |
833 | case ND_NEIGHBOR_ADVERT: |
834 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); |
835 | if (code != 0) |
836 | goto badcode; |
837 | if (icmp6len < sizeof(struct nd_neighbor_advert)) |
838 | goto badlen; |
839 | |
840 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
841 | /* give up local */ |
842 | nd6_na_input(m, off, icmp6len); |
843 | m = NULL; |
844 | goto freeit; |
845 | } |
846 | nd6_na_input(n, off, icmp6len); |
847 | /* m stays. */ |
848 | goto rate_limit_checked; |
849 | |
850 | case ND_REDIRECT: |
851 | icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); |
852 | if (code != 0) |
853 | goto badcode; |
854 | if (icmp6len < sizeof(struct nd_redirect)) |
855 | goto badlen; |
856 | |
857 | if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { |
858 | /* give up local */ |
859 | icmp6_redirect_input(m, off); |
860 | m = NULL; |
861 | goto freeit; |
862 | } |
863 | icmp6_redirect_input(n, off); |
864 | /* m stays. */ |
865 | goto rate_limit_checked; |
866 | |
867 | case ICMP6_ROUTER_RENUMBERING: |
868 | if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && |
869 | code != ICMP6_ROUTER_RENUMBERING_RESULT) |
870 | goto badcode; |
871 | if (icmp6len < sizeof(struct icmp6_router_renum)) |
872 | goto badlen; |
873 | break; |
874 | |
875 | default: |
876 | nd6log((LOG_DEBUG, |
877 | "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n" , |
878 | icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), |
879 | ip6_sprintf(&ip6->ip6_dst), |
880 | m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); |
881 | if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { |
882 | /* ICMPv6 error: MUST deliver it by spec... */ |
883 | code = PRC_NCMDS; |
884 | /* deliver */ |
885 | } else { |
886 | /* ICMPv6 informational: MUST not deliver */ |
887 | goto rate_limit_checked; |
888 | } |
889 | deliver: |
890 | if (icmp6_notify_error(m, off, icmp6len, code)) { |
891 | /* In this case, m should've been freed. */ |
892 | return(IPPROTO_DONE); |
893 | } |
894 | break; |
895 | |
896 | badcode: |
897 | icmp6stat.icp6s_badcode++; |
898 | break; |
899 | |
900 | badlen: |
901 | icmp6stat.icp6s_badlen++; |
902 | break; |
903 | } |
904 | |
905 | rate_limit_checked: |
906 | icmp6_rip6_input(&m, *offp); |
907 | return IPPROTO_DONE; |
908 | |
909 | freeit: |
910 | m_freem(m); |
911 | return IPPROTO_DONE; |
912 | } |
913 | |
914 | static int |
915 | icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) |
916 | { |
917 | struct icmp6_hdr *icmp6; |
918 | struct ip6_hdr *eip6; |
919 | u_int32_t notifymtu; |
920 | struct sockaddr_in6 icmp6src, icmp6dst; |
921 | |
922 | if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { |
923 | icmp6stat.icp6s_tooshort++; |
924 | goto freeit; |
925 | } |
926 | #ifndef PULLDOWN_TEST |
927 | IP6_EXTHDR_CHECK(m, off, |
928 | sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), |
929 | return -1); |
930 | icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); |
931 | #else |
932 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, |
933 | sizeof(*icmp6) + sizeof(struct ip6_hdr)); |
934 | if (icmp6 == NULL) { |
935 | icmp6stat.icp6s_tooshort++; |
936 | return(-1); |
937 | } |
938 | #endif |
939 | eip6 = (struct ip6_hdr *)(icmp6 + 1); |
940 | |
941 | /* Detect the upper level protocol */ |
942 | { |
943 | void (*ctlfunc)(int, struct sockaddr *, void *, struct ifnet *); |
944 | u_int8_t nxt = eip6->ip6_nxt; |
945 | int eoff = off + sizeof(struct icmp6_hdr) + |
946 | sizeof(struct ip6_hdr); |
947 | struct ip6ctlparam ip6cp; |
948 | struct in6_addr *finaldst = NULL; |
949 | int icmp6type = icmp6->icmp6_type; |
950 | struct ip6_frag *fh; |
951 | struct ip6_rthdr *rth; |
952 | struct ip6_rthdr0 *rth0; |
953 | int rthlen; |
954 | |
955 | while (1) { /* XXX: should avoid infinite loop explicitly? */ |
956 | struct ip6_ext *eh; |
957 | |
958 | switch (nxt) { |
959 | case IPPROTO_HOPOPTS: |
960 | case IPPROTO_DSTOPTS: |
961 | case IPPROTO_AH: |
962 | #ifndef PULLDOWN_TEST |
963 | IP6_EXTHDR_CHECK(m, 0, eoff + |
964 | sizeof(struct ip6_ext), |
965 | return -1); |
966 | eh = (struct ip6_ext *)(mtod(m, caddr_t) |
967 | + eoff); |
968 | #else |
969 | IP6_EXTHDR_GET(eh, struct ip6_ext *, m, |
970 | eoff, sizeof(*eh)); |
971 | if (eh == NULL) { |
972 | icmp6stat.icp6s_tooshort++; |
973 | return(-1); |
974 | } |
975 | #endif |
976 | |
977 | if (nxt == IPPROTO_AH) |
978 | eoff += (eh->ip6e_len + 2) << 2; |
979 | else |
980 | eoff += (eh->ip6e_len + 1) << 3; |
981 | nxt = eh->ip6e_nxt; |
982 | break; |
983 | case IPPROTO_ROUTING: |
984 | /* |
985 | * When the erroneous packet contains a |
986 | * routing header, we should examine the |
987 | * header to determine the final destination. |
988 | * Otherwise, we can't properly update |
989 | * information that depends on the final |
990 | * destination (e.g. path MTU). |
991 | */ |
992 | #ifndef PULLDOWN_TEST |
993 | IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), |
994 | return -1); |
995 | rth = (struct ip6_rthdr *)(mtod(m, caddr_t) |
996 | + eoff); |
997 | #else |
998 | IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, |
999 | eoff, sizeof(*rth)); |
1000 | if (rth == NULL) { |
1001 | icmp6stat.icp6s_tooshort++; |
1002 | return(-1); |
1003 | } |
1004 | #endif |
1005 | rthlen = (rth->ip6r_len + 1) << 3; |
1006 | /* |
1007 | * XXX: currently there is no |
1008 | * officially defined type other |
1009 | * than type-0. |
1010 | * Note that if the segment left field |
1011 | * is 0, all intermediate hops must |
1012 | * have been passed. |
1013 | */ |
1014 | if (rth->ip6r_segleft && |
1015 | rth->ip6r_type == IPV6_RTHDR_TYPE_0) { |
1016 | int hops; |
1017 | |
1018 | #ifndef PULLDOWN_TEST |
1019 | IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, |
1020 | return -1); |
1021 | rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); |
1022 | #else |
1023 | IP6_EXTHDR_GET(rth0, |
1024 | struct ip6_rthdr0 *, m, |
1025 | eoff, rthlen); |
1026 | if (rth0 == NULL) { |
1027 | icmp6stat.icp6s_tooshort++; |
1028 | return(-1); |
1029 | } |
1030 | #endif |
1031 | /* just ignore a bogus header */ |
1032 | if ((rth0->ip6r0_len % 2) == 0 && |
1033 | (hops = rth0->ip6r0_len/2)) |
1034 | finaldst = (struct in6_addr *)(void *)(rth0 + 1) + (hops - 1); |
1035 | } |
1036 | eoff += rthlen; |
1037 | nxt = rth->ip6r_nxt; |
1038 | break; |
1039 | case IPPROTO_FRAGMENT: |
1040 | #ifndef PULLDOWN_TEST |
1041 | IP6_EXTHDR_CHECK(m, 0, eoff + |
1042 | sizeof(struct ip6_frag), |
1043 | return -1); |
1044 | fh = (struct ip6_frag *)(mtod(m, caddr_t) |
1045 | + eoff); |
1046 | #else |
1047 | IP6_EXTHDR_GET(fh, struct ip6_frag *, m, |
1048 | eoff, sizeof(*fh)); |
1049 | if (fh == NULL) { |
1050 | icmp6stat.icp6s_tooshort++; |
1051 | return (-1); |
1052 | } |
1053 | #endif |
1054 | /* |
1055 | * Data after a fragment header is meaningless |
1056 | * unless it is the first fragment, but |
1057 | * we'll go to the notify label for path MTU |
1058 | * discovery. |
1059 | */ |
1060 | if (fh->ip6f_offlg & IP6F_OFF_MASK) |
1061 | goto notify; |
1062 | |
1063 | eoff += sizeof(struct ip6_frag); |
1064 | nxt = fh->ip6f_nxt; |
1065 | break; |
1066 | default: |
1067 | /* |
1068 | * This case includes ESP and the No Next |
1069 | * Header. In such cases going to the notify |
1070 | * label does not have any meaning |
1071 | * (i.e. ctlfunc will be NULL), but we go |
1072 | * anyway since we might have to update |
1073 | * path MTU information. |
1074 | */ |
1075 | goto notify; |
1076 | } |
1077 | } |
1078 | notify: |
1079 | #ifndef PULLDOWN_TEST |
1080 | icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); |
1081 | #else |
1082 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, |
1083 | sizeof(*icmp6) + sizeof(struct ip6_hdr)); |
1084 | if (icmp6 == NULL) { |
1085 | icmp6stat.icp6s_tooshort++; |
1086 | return (-1); |
1087 | } |
1088 | #endif |
1089 | |
1090 | /* |
1091 | * retrieve parameters from the inner IPv6 header, and convert |
1092 | * them into sockaddr structures. |
1093 | * XXX: there is no guarantee that the source or destination |
1094 | * addresses of the inner packet are in the same scope as |
1095 | * the addresses of the icmp packet. But there is no other |
1096 | * way to determine the zone. |
1097 | */ |
1098 | eip6 = (struct ip6_hdr *)(icmp6 + 1); |
1099 | |
1100 | bzero(&icmp6dst, sizeof(icmp6dst)); |
1101 | icmp6dst.sin6_len = sizeof(struct sockaddr_in6); |
1102 | icmp6dst.sin6_family = AF_INET6; |
1103 | if (finaldst == NULL) |
1104 | icmp6dst.sin6_addr = eip6->ip6_dst; |
1105 | else |
1106 | icmp6dst.sin6_addr = *finaldst; |
1107 | if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) |
1108 | goto freeit; |
1109 | bzero(&icmp6src, sizeof(icmp6src)); |
1110 | icmp6src.sin6_len = sizeof(struct sockaddr_in6); |
1111 | icmp6src.sin6_family = AF_INET6; |
1112 | icmp6src.sin6_addr = eip6->ip6_src; |
1113 | if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) |
1114 | goto freeit; |
1115 | icmp6src.sin6_flowinfo = |
1116 | (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); |
1117 | |
1118 | if (finaldst == NULL) |
1119 | finaldst = &eip6->ip6_dst; |
1120 | ip6cp.ip6c_m = m; |
1121 | ip6cp.ip6c_icmp6 = icmp6; |
1122 | ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); |
1123 | ip6cp.ip6c_off = eoff; |
1124 | ip6cp.ip6c_finaldst = finaldst; |
1125 | ip6cp.ip6c_src = &icmp6src; |
1126 | ip6cp.ip6c_nxt = nxt; |
1127 | |
1128 | if (icmp6type == ICMP6_PACKET_TOO_BIG) { |
1129 | notifymtu = ntohl(icmp6->icmp6_mtu); |
1130 | ip6cp.ip6c_cmdarg = (void *)¬ifymtu; |
1131 | icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ |
1132 | } |
1133 | |
1134 | ctlfunc = ip6_protox[nxt]->pr_ctlinput; |
1135 | if (ctlfunc) { |
1136 | LCK_MTX_ASSERT(inet6_domain_mutex, LCK_MTX_ASSERT_OWNED); |
1137 | |
1138 | lck_mtx_unlock(inet6_domain_mutex); |
1139 | |
1140 | (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, |
1141 | &ip6cp, m->m_pkthdr.rcvif); |
1142 | |
1143 | lck_mtx_lock(inet6_domain_mutex); |
1144 | } |
1145 | } |
1146 | return(0); |
1147 | |
1148 | freeit: |
1149 | m_freem(m); |
1150 | return(-1); |
1151 | } |
1152 | |
1153 | void |
1154 | icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) |
1155 | { |
1156 | struct in6_addr *dst = ip6cp->ip6c_finaldst; |
1157 | struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; |
1158 | struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ |
1159 | u_int mtu = ntohl(icmp6->icmp6_mtu); |
1160 | struct rtentry *rt = NULL; |
1161 | struct sockaddr_in6 sin6; |
1162 | /* |
1163 | * we reject ICMPv6 too big with abnormally small value. |
1164 | * XXX what is the good definition of "abnormally small"? |
1165 | */ |
1166 | if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) |
1167 | return; |
1168 | |
1169 | if (!validated) |
1170 | return; |
1171 | |
1172 | /* |
1173 | * In case the suggested mtu is less than IPV6_MMTU, we |
1174 | * only need to remember that it was for above mentioned |
1175 | * "alwaysfrag" case. |
1176 | * Try to be as close to the spec as possible. |
1177 | */ |
1178 | if (mtu < IPV6_MMTU) |
1179 | mtu = IPV6_MMTU - 8; |
1180 | |
1181 | bzero(&sin6, sizeof(sin6)); |
1182 | sin6.sin6_family = PF_INET6; |
1183 | sin6.sin6_len = sizeof(struct sockaddr_in6); |
1184 | sin6.sin6_addr = *dst; |
1185 | /* XXX normally, this won't happen */ |
1186 | if (IN6_IS_ADDR_LINKLOCAL(dst)) { |
1187 | sin6.sin6_addr.s6_addr16[1] = |
1188 | htons(m->m_pkthdr.rcvif->if_index); |
1189 | } |
1190 | /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ |
1191 | /* |
1192 | * XXX On a side note, for asymmetric data-path |
1193 | * the lookup on receive interace is probably not |
1194 | * what we want to do. |
1195 | * That requires looking at the cached route for the |
1196 | * protocol control block. |
1197 | */ |
1198 | rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, |
1199 | RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index); |
1200 | if (rt != NULL) { |
1201 | RT_LOCK(rt); |
1202 | if ((rt->rt_flags & RTF_HOST) && |
1203 | !(rt->rt_rmx.rmx_locks & RTV_MTU) && |
1204 | mtu < IN6_LINKMTU(rt->rt_ifp) && |
1205 | rt->rt_rmx.rmx_mtu > mtu) { |
1206 | icmp6stat.icp6s_pmtuchg++; |
1207 | rt->rt_rmx.rmx_mtu = mtu; |
1208 | } |
1209 | RT_UNLOCK(rt); |
1210 | rtfree(rt); |
1211 | } |
1212 | } |
1213 | |
1214 | /* |
1215 | * Process a Node Information Query packet, based on |
1216 | * draft-ietf-ipngwg-icmp-name-lookups-07. |
1217 | * |
1218 | * Spec incompatibilities: |
1219 | * - IPv6 Subject address handling |
1220 | * - IPv4 Subject address handling support missing |
1221 | * - Proxy reply (answer even if it's not for me) |
1222 | * - joins NI group address at in6_ifattach() time only, does not cope |
1223 | * with hostname changes by sethostname(3) |
1224 | */ |
1225 | #define hostnamelen strlen(hostname) |
1226 | static struct mbuf * |
1227 | ni6_input(struct mbuf *m, int off) |
1228 | { |
1229 | struct icmp6_nodeinfo *ni6, *nni6; |
1230 | struct mbuf *n = NULL; |
1231 | u_int16_t qtype; |
1232 | int subjlen; |
1233 | int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); |
1234 | struct ni_reply_fqdn *fqdn; |
1235 | int addrs; /* for NI_QTYPE_NODEADDR */ |
1236 | struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ |
1237 | struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ |
1238 | struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ |
1239 | struct ip6_hdr *ip6; |
1240 | int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ |
1241 | char *subj = NULL; |
1242 | |
1243 | ip6 = mtod(m, struct ip6_hdr *); |
1244 | #ifndef PULLDOWN_TEST |
1245 | ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); |
1246 | #else |
1247 | IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); |
1248 | if (ni6 == NULL) { |
1249 | /* m is already reclaimed */ |
1250 | return (NULL); |
1251 | } |
1252 | #endif |
1253 | |
1254 | /* |
1255 | * Validate IPv6 source address. |
1256 | * The default configuration MUST be to refuse answering queries from |
1257 | * global-scope addresses according to RFC4602. |
1258 | * Notes: |
1259 | * - it's not very clear what "refuse" means; this implementation |
1260 | * simply drops it. |
1261 | * - it's not very easy to identify global-scope (unicast) addresses |
1262 | * since there are many prefixes for them. It should be safer |
1263 | * and in practice sufficient to check "all" but loopback and |
1264 | * link-local (note that site-local unicast was deprecated and |
1265 | * ULA is defined as global scope-wise) |
1266 | */ |
1267 | if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && |
1268 | !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && |
1269 | !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) |
1270 | goto bad; |
1271 | |
1272 | /* |
1273 | * Validate IPv6 destination address. |
1274 | * |
1275 | * The Responder must discard the Query without further processing |
1276 | * unless it is one of the Responder's unicast or anycast addresses, or |
1277 | * a link-local scope multicast address which the Responder has joined. |
1278 | * [RFC4602, Section 5.] |
1279 | */ |
1280 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
1281 | if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) |
1282 | goto bad; |
1283 | /* else it's a link-local multicast, fine */ |
1284 | } else { /* unicast or anycast */ |
1285 | uint32_t ia6_flags; |
1286 | |
1287 | if (ip6_getdstifaddr_info(m, NULL, &ia6_flags) != 0) |
1288 | goto bad; /* XXX impossible */ |
1289 | |
1290 | if ((ia6_flags & IN6_IFF_TEMPORARY) && |
1291 | !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { |
1292 | nd6log((LOG_DEBUG, "ni6_input: ignore node info to " |
1293 | "a temporary address in %s:%d" , |
1294 | __func__, __LINE__)); |
1295 | goto bad; |
1296 | } |
1297 | } |
1298 | |
1299 | /* validate query Subject field. */ |
1300 | qtype = ntohs(ni6->ni_qtype); |
1301 | subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); |
1302 | switch (qtype) { |
1303 | case NI_QTYPE_NOOP: |
1304 | case NI_QTYPE_SUPTYPES: |
1305 | /* 07 draft */ |
1306 | if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) |
1307 | break; |
1308 | /* FALLTHROUGH */ |
1309 | case NI_QTYPE_FQDN: |
1310 | case NI_QTYPE_NODEADDR: |
1311 | case NI_QTYPE_IPV4ADDR: |
1312 | switch (ni6->ni_code) { |
1313 | case ICMP6_NI_SUBJ_IPV6: |
1314 | #if ICMP6_NI_SUBJ_IPV6 != 0 |
1315 | case 0: |
1316 | #endif |
1317 | /* |
1318 | * backward compatibility - try to accept 03 draft |
1319 | * format, where no Subject is present. |
1320 | */ |
1321 | if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && |
1322 | subjlen == 0) { |
1323 | oldfqdn++; |
1324 | break; |
1325 | } |
1326 | #if ICMP6_NI_SUBJ_IPV6 != 0 |
1327 | if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) |
1328 | goto bad; |
1329 | #endif |
1330 | |
1331 | if (subjlen != sizeof(struct in6_addr)) |
1332 | goto bad; |
1333 | |
1334 | /* |
1335 | * Validate Subject address. |
1336 | * |
1337 | * Not sure what exactly "address belongs to the node" |
1338 | * means in the spec, is it just unicast, or what? |
1339 | * |
1340 | * At this moment we consider Subject address as |
1341 | * "belong to the node" if the Subject address equals |
1342 | * to the IPv6 destination address; validation for |
1343 | * IPv6 destination address should have done enough |
1344 | * check for us. |
1345 | * |
1346 | * We do not do proxy at this moment. |
1347 | */ |
1348 | /* m_pulldown instead of copy? */ |
1349 | m_copydata(m, off + sizeof(struct icmp6_nodeinfo), |
1350 | subjlen, (caddr_t)&sin6.sin6_addr); |
1351 | sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, |
1352 | &sin6.sin6_addr); |
1353 | in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL, |
1354 | NULL); |
1355 | bzero(&sin6_d, sizeof(sin6_d)); |
1356 | sin6_d.sin6_family = AF_INET6; /* not used, actually */ |
1357 | sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ |
1358 | sin6_d.sin6_addr = ip6->ip6_dst; |
1359 | sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, |
1360 | &ip6->ip6_dst); |
1361 | in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL, |
1362 | NULL); |
1363 | subj = (char *)&sin6; |
1364 | if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) |
1365 | break; |
1366 | |
1367 | /* |
1368 | * XXX if we are to allow other cases, we should really |
1369 | * be careful about scope here. |
1370 | * basically, we should disallow queries toward IPv6 |
1371 | * destination X with subject Y, |
1372 | * if scope(X) > scope(Y). |
1373 | * if we allow scope(X) > scope(Y), it will result in |
1374 | * information leakage across scope boundary. |
1375 | */ |
1376 | goto bad; |
1377 | |
1378 | case ICMP6_NI_SUBJ_FQDN: |
1379 | /* |
1380 | * Validate Subject name with gethostname(3). |
1381 | * |
1382 | * The behavior may need some debate, since: |
1383 | * - we are not sure if the node has FQDN as |
1384 | * hostname (returned by gethostname(3)). |
1385 | * - the code does wildcard match for truncated names. |
1386 | * however, we are not sure if we want to perform |
1387 | * wildcard match, if gethostname(3) side has |
1388 | * truncated hostname. |
1389 | */ |
1390 | n = ni6_nametodns(hostname, hostnamelen, 0); |
1391 | if (!n || n->m_next || n->m_len == 0) |
1392 | goto bad; |
1393 | IP6_EXTHDR_GET(subj, char *, m, |
1394 | off + sizeof(struct icmp6_nodeinfo), subjlen); |
1395 | if (subj == NULL) |
1396 | goto bad; |
1397 | if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), |
1398 | n->m_len)) { |
1399 | goto bad; |
1400 | } |
1401 | m_freem(n); |
1402 | n = NULL; |
1403 | break; |
1404 | |
1405 | case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ |
1406 | default: |
1407 | goto bad; |
1408 | } |
1409 | break; |
1410 | } |
1411 | |
1412 | /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ |
1413 | switch (qtype) { |
1414 | case NI_QTYPE_FQDN: |
1415 | if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) |
1416 | goto bad; |
1417 | break; |
1418 | case NI_QTYPE_NODEADDR: |
1419 | case NI_QTYPE_IPV4ADDR: |
1420 | if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) |
1421 | goto bad; |
1422 | break; |
1423 | } |
1424 | |
1425 | /* guess reply length */ |
1426 | switch (qtype) { |
1427 | case NI_QTYPE_NOOP: |
1428 | break; /* no reply data */ |
1429 | case NI_QTYPE_SUPTYPES: |
1430 | replylen += sizeof(u_int32_t); |
1431 | break; |
1432 | case NI_QTYPE_FQDN: |
1433 | /* XXX will append an mbuf */ |
1434 | replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); |
1435 | break; |
1436 | case NI_QTYPE_NODEADDR: |
1437 | addrs = ni6_addrs(ni6, &ifp, subj); |
1438 | if ((replylen += addrs * (sizeof(struct in6_addr) + |
1439 | sizeof(u_int32_t))) > MCLBYTES) |
1440 | replylen = MCLBYTES; /* XXX: will truncate pkt later */ |
1441 | break; |
1442 | case NI_QTYPE_IPV4ADDR: |
1443 | /* unsupported - should respond with unknown Qtype? */ |
1444 | break; |
1445 | default: |
1446 | /* |
1447 | * XXX: We must return a reply with the ICMP6 code |
1448 | * `unknown Qtype' in this case. However we regard the case |
1449 | * as an FQDN query for backward compatibility. |
1450 | * Older versions set a random value to this field, |
1451 | * so it rarely varies in the defined qtypes. |
1452 | * But the mechanism is not reliable... |
1453 | * maybe we should obsolete older versions. |
1454 | */ |
1455 | qtype = NI_QTYPE_FQDN; |
1456 | /* XXX will append an mbuf */ |
1457 | replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); |
1458 | oldfqdn++; |
1459 | break; |
1460 | } |
1461 | |
1462 | /* allocate an mbuf to reply. */ |
1463 | MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */ |
1464 | if (n == NULL) { |
1465 | m_freem(m); |
1466 | if (ifp != NULL) |
1467 | ifnet_release(ifp); |
1468 | return (NULL); |
1469 | } |
1470 | M_COPY_PKTHDR(n, m); /* just for recvif */ |
1471 | if (replylen > MHLEN) { |
1472 | if (replylen > MCLBYTES) { |
1473 | /* |
1474 | * XXX: should we try to allocate more? But MCLBYTES |
1475 | * is probably much larger than IPV6_MMTU... |
1476 | */ |
1477 | goto bad; |
1478 | } |
1479 | MCLGET(n, M_DONTWAIT); |
1480 | if ((n->m_flags & M_EXT) == 0) { |
1481 | goto bad; |
1482 | } |
1483 | } |
1484 | n->m_pkthdr.len = n->m_len = replylen; |
1485 | |
1486 | /* copy mbuf header and IPv6 + Node Information base headers */ |
1487 | bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); |
1488 | nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); |
1489 | bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); |
1490 | |
1491 | /* qtype dependent procedure */ |
1492 | switch (qtype) { |
1493 | case NI_QTYPE_NOOP: |
1494 | nni6->ni_code = ICMP6_NI_SUCCESS; |
1495 | nni6->ni_flags = 0; |
1496 | break; |
1497 | case NI_QTYPE_SUPTYPES: |
1498 | { |
1499 | u_int32_t v; |
1500 | nni6->ni_code = ICMP6_NI_SUCCESS; |
1501 | nni6->ni_flags = htons(0x0000); /* raw bitmap */ |
1502 | /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ |
1503 | v = (u_int32_t)htonl(0x0000000f); |
1504 | bcopy(&v, nni6 + 1, sizeof(u_int32_t)); |
1505 | break; |
1506 | } |
1507 | case NI_QTYPE_FQDN: |
1508 | nni6->ni_code = ICMP6_NI_SUCCESS; |
1509 | fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + |
1510 | sizeof(struct ip6_hdr) + |
1511 | sizeof(struct icmp6_nodeinfo)); |
1512 | nni6->ni_flags = 0; /* XXX: meaningless TTL */ |
1513 | fqdn->ni_fqdn_ttl = 0; /* ditto. */ |
1514 | /* |
1515 | * XXX do we really have FQDN in variable "hostname"? |
1516 | */ |
1517 | n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); |
1518 | if (n->m_next == NULL) |
1519 | goto bad; |
1520 | /* XXX we assume that n->m_next is not a chain */ |
1521 | if (n->m_next->m_next != NULL) |
1522 | goto bad; |
1523 | n->m_pkthdr.len += n->m_next->m_len; |
1524 | break; |
1525 | case NI_QTYPE_NODEADDR: |
1526 | { |
1527 | int lenlim, copied; |
1528 | |
1529 | nni6->ni_code = ICMP6_NI_SUCCESS; |
1530 | n->m_pkthdr.len = n->m_len = |
1531 | sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); |
1532 | lenlim = M_TRAILINGSPACE(n); |
1533 | copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); |
1534 | /* XXX: reset mbuf length */ |
1535 | n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + |
1536 | sizeof(struct icmp6_nodeinfo) + copied; |
1537 | break; |
1538 | } |
1539 | default: |
1540 | break; /* XXX impossible! */ |
1541 | } |
1542 | |
1543 | nni6->ni_type = ICMP6_NI_REPLY; |
1544 | m_freem(m); |
1545 | if (ifp != NULL) |
1546 | ifnet_release(ifp); |
1547 | return (n); |
1548 | |
1549 | bad: |
1550 | m_freem(m); |
1551 | if (n) |
1552 | m_freem(n); |
1553 | if (ifp != NULL) |
1554 | ifnet_release(ifp); |
1555 | return (NULL); |
1556 | } |
1557 | #undef hostnamelen |
1558 | |
1559 | /* |
1560 | * make a mbuf with DNS-encoded string. no compression support. |
1561 | * |
1562 | * XXX names with less than 2 dots (like "foo" or "foo.section") will be |
1563 | * treated as truncated name (two \0 at the end). this is a wild guess. |
1564 | */ |
1565 | static struct mbuf * |
1566 | ni6_nametodns( |
1567 | const char *name, |
1568 | int namelen, |
1569 | int old) /* return pascal string if non-zero */ |
1570 | { |
1571 | struct mbuf *m; |
1572 | char *cp, *ep; |
1573 | const char *p, *q; |
1574 | int i, len, nterm; |
1575 | |
1576 | if (old) |
1577 | len = namelen + 1; |
1578 | else |
1579 | len = MCLBYTES; |
1580 | |
1581 | /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ |
1582 | MGET(m, M_DONTWAIT, MT_DATA); |
1583 | if (m && len > MLEN) { |
1584 | MCLGET(m, M_DONTWAIT); |
1585 | if ((m->m_flags & M_EXT) == 0) |
1586 | goto fail; |
1587 | } |
1588 | if (!m) |
1589 | goto fail; |
1590 | m->m_next = NULL; |
1591 | |
1592 | if (old) { |
1593 | m->m_len = len; |
1594 | *mtod(m, char *) = namelen; |
1595 | bcopy(name, mtod(m, char *) + 1, namelen); |
1596 | return m; |
1597 | } else { |
1598 | m->m_len = 0; |
1599 | cp = mtod(m, char *); |
1600 | ep = mtod(m, char *) + M_TRAILINGSPACE(m); |
1601 | |
1602 | /* if not certain about my name, return empty buffer */ |
1603 | if (namelen == 0) |
1604 | return m; |
1605 | |
1606 | /* |
1607 | * guess if it looks like shortened hostname, or FQDN. |
1608 | * shortened hostname needs two trailing "\0". |
1609 | */ |
1610 | i = 0; |
1611 | for (p = name; p < name + namelen; p++) { |
1612 | if (*p && *p == '.') |
1613 | i++; |
1614 | } |
1615 | if (i < 2) |
1616 | nterm = 2; |
1617 | else |
1618 | nterm = 1; |
1619 | |
1620 | p = name; |
1621 | while (cp < ep && p < name + namelen) { |
1622 | i = 0; |
1623 | for (q = p; q < name + namelen && *q && *q != '.'; q++) |
1624 | i++; |
1625 | /* result does not fit into mbuf */ |
1626 | if (cp + i + 1 >= ep) |
1627 | goto fail; |
1628 | /* |
1629 | * DNS label length restriction, RFC1035 page 8. |
1630 | * "i == 0" case is included here to avoid returning |
1631 | * 0-length label on "foo..bar". |
1632 | */ |
1633 | if (i <= 0 || i >= 64) |
1634 | goto fail; |
1635 | *cp++ = i; |
1636 | bcopy(p, cp, i); |
1637 | cp += i; |
1638 | p = q; |
1639 | if (p < name + namelen && *p == '.') |
1640 | p++; |
1641 | } |
1642 | /* termination */ |
1643 | if (cp + nterm >= ep) |
1644 | goto fail; |
1645 | while (nterm-- > 0) |
1646 | *cp++ = '\0'; |
1647 | m->m_len = cp - mtod(m, char *); |
1648 | return m; |
1649 | } |
1650 | |
1651 | panic("should not reach here" ); |
1652 | /* NOTREACHED */ |
1653 | |
1654 | fail: |
1655 | if (m) |
1656 | m_freem(m); |
1657 | return NULL; |
1658 | } |
1659 | |
1660 | /* |
1661 | * check if two DNS-encoded string matches. takes care of truncated |
1662 | * form (with \0\0 at the end). no compression support. |
1663 | * XXX upper/lowercase match (see RFC2065) |
1664 | */ |
1665 | static int |
1666 | ni6_dnsmatch(const char *a, int alen, const char *b, int blen) |
1667 | { |
1668 | const char *a0, *b0; |
1669 | int l; |
1670 | |
1671 | /* simplest case - need validation? */ |
1672 | if (alen == blen && bcmp(a, b, alen) == 0) |
1673 | return 1; |
1674 | |
1675 | a0 = a; |
1676 | b0 = b; |
1677 | |
1678 | /* termination is mandatory */ |
1679 | if (alen < 2 || blen < 2) |
1680 | return 0; |
1681 | if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') |
1682 | return 0; |
1683 | alen--; |
1684 | blen--; |
1685 | |
1686 | while (a - a0 < alen && b - b0 < blen) { |
1687 | if (a - a0 + 1 > alen || b - b0 + 1 > blen) |
1688 | return 0; |
1689 | |
1690 | if ((signed char)a[0] < 0 || (signed char)b[0] < 0) |
1691 | return 0; |
1692 | /* we don't support compression yet */ |
1693 | if (a[0] >= 64 || b[0] >= 64) |
1694 | return 0; |
1695 | |
1696 | /* truncated case */ |
1697 | if (a[0] == 0 && a - a0 == alen - 1) |
1698 | return 1; |
1699 | if (b[0] == 0 && b - b0 == blen - 1) |
1700 | return 1; |
1701 | if (a[0] == 0 || b[0] == 0) |
1702 | return 0; |
1703 | |
1704 | if (a[0] != b[0]) |
1705 | return 0; |
1706 | l = a[0]; |
1707 | if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) |
1708 | return 0; |
1709 | if (bcmp(a + 1, b + 1, l) != 0) |
1710 | return 0; |
1711 | |
1712 | a += 1 + l; |
1713 | b += 1 + l; |
1714 | } |
1715 | |
1716 | if (a - a0 == alen && b - b0 == blen) |
1717 | return 1; |
1718 | else |
1719 | return 0; |
1720 | } |
1721 | |
1722 | /* |
1723 | * calculate the number of addresses to be returned in the node info reply. |
1724 | */ |
1725 | static int |
1726 | ni6_addrs(struct icmp6_nodeinfo *ni6, struct ifnet **ifpp, char *subj) |
1727 | { |
1728 | struct ifnet *ifp; |
1729 | struct in6_ifaddr *ifa6; |
1730 | struct ifaddr *ifa; |
1731 | struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ |
1732 | int addrs = 0, addrsofif, iffound = 0; |
1733 | int niflags = ni6->ni_flags; |
1734 | |
1735 | if (ifpp != NULL) |
1736 | *ifpp = NULL; |
1737 | |
1738 | if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { |
1739 | switch (ni6->ni_code) { |
1740 | case ICMP6_NI_SUBJ_IPV6: |
1741 | if (subj == NULL) /* must be impossible... */ |
1742 | return(0); |
1743 | subj_ip6 = (struct sockaddr_in6 *)(void *)subj; |
1744 | break; |
1745 | default: |
1746 | /* |
1747 | * XXX: we only support IPv6 subject address for |
1748 | * this Qtype. |
1749 | */ |
1750 | return (0); |
1751 | } |
1752 | } |
1753 | |
1754 | ifnet_head_lock_shared(); |
1755 | TAILQ_FOREACH(ifp, &ifnet_head, if_list) { |
1756 | addrsofif = 0; |
1757 | ifnet_lock_shared(ifp); |
1758 | TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) |
1759 | { |
1760 | IFA_LOCK(ifa); |
1761 | if (ifa->ifa_addr->sa_family != AF_INET6) { |
1762 | IFA_UNLOCK(ifa); |
1763 | continue; |
1764 | } |
1765 | ifa6 = (struct in6_ifaddr *)ifa; |
1766 | |
1767 | if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && |
1768 | IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, |
1769 | &ifa6->ia_addr.sin6_addr)) |
1770 | iffound = 1; |
1771 | |
1772 | /* |
1773 | * IPv4-mapped addresses can only be returned by a |
1774 | * Node Information proxy, since they represent |
1775 | * addresses of IPv4-only nodes, which perforce do |
1776 | * not implement this protocol. |
1777 | * [icmp-name-lookups-07, Section 5.4] |
1778 | * So we don't support NI_NODEADDR_FLAG_COMPAT in |
1779 | * this function at this moment. |
1780 | */ |
1781 | |
1782 | /* What do we have to do about ::1? */ |
1783 | switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { |
1784 | case IPV6_ADDR_SCOPE_LINKLOCAL: |
1785 | if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) { |
1786 | IFA_UNLOCK(ifa); |
1787 | continue; |
1788 | } |
1789 | break; |
1790 | case IPV6_ADDR_SCOPE_SITELOCAL: |
1791 | if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { |
1792 | IFA_UNLOCK(ifa); |
1793 | continue; |
1794 | } |
1795 | break; |
1796 | case IPV6_ADDR_SCOPE_GLOBAL: |
1797 | if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { |
1798 | IFA_UNLOCK(ifa); |
1799 | continue; |
1800 | } |
1801 | break; |
1802 | default: |
1803 | IFA_UNLOCK(ifa); |
1804 | continue; |
1805 | } |
1806 | |
1807 | /* |
1808 | * check if anycast is okay. |
1809 | * XXX: just experimental. not in the spec. |
1810 | */ |
1811 | if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && |
1812 | (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) { |
1813 | IFA_UNLOCK(ifa); |
1814 | continue; /* we need only unicast addresses */ |
1815 | } |
1816 | if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && |
1817 | (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { |
1818 | IFA_UNLOCK(ifa); |
1819 | continue; |
1820 | } |
1821 | addrsofif++; /* count the address */ |
1822 | IFA_UNLOCK(ifa); |
1823 | } |
1824 | ifnet_lock_done(ifp); |
1825 | if (iffound) { |
1826 | if (ifpp != NULL) { |
1827 | *ifpp = ifp; |
1828 | ifnet_reference(ifp); |
1829 | } |
1830 | ifnet_head_done(); |
1831 | return(addrsofif); |
1832 | } |
1833 | |
1834 | addrs += addrsofif; |
1835 | } |
1836 | ifnet_head_done(); |
1837 | |
1838 | return (addrs); |
1839 | } |
1840 | |
1841 | static int |
1842 | ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, |
1843 | struct ifnet *ifp0, int resid) |
1844 | { |
1845 | struct ifnet *ifp = ifp0; |
1846 | struct in6_ifaddr *ifa6; |
1847 | struct ifaddr *ifa; |
1848 | struct ifnet *ifp_dep = NULL; |
1849 | int copied = 0, allow_deprecated = 0; |
1850 | u_char *cp = (u_char *)(nni6 + 1); |
1851 | int niflags = ni6->ni_flags; |
1852 | u_int32_t ltime; |
1853 | uint64_t now = net_uptime(); |
1854 | |
1855 | if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) |
1856 | return (0); /* needless to copy */ |
1857 | |
1858 | again: |
1859 | |
1860 | ifnet_head_lock_shared(); |
1861 | if (ifp == NULL) |
1862 | ifp = TAILQ_FIRST(&ifnet_head); |
1863 | |
1864 | for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { |
1865 | ifnet_lock_shared(ifp); |
1866 | for (ifa = ifp->if_addrlist.tqh_first; ifa; |
1867 | ifa = ifa->ifa_list.tqe_next) { |
1868 | struct in6_addrlifetime_i *lt; |
1869 | |
1870 | IFA_LOCK(ifa); |
1871 | if (ifa->ifa_addr->sa_family != AF_INET6) { |
1872 | IFA_UNLOCK(ifa); |
1873 | continue; |
1874 | } |
1875 | ifa6 = (struct in6_ifaddr *)ifa; |
1876 | |
1877 | if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && |
1878 | allow_deprecated == 0) { |
1879 | /* |
1880 | * prefererred address should be put before |
1881 | * deprecated addresses. |
1882 | */ |
1883 | |
1884 | /* record the interface for later search */ |
1885 | if (ifp_dep == NULL) |
1886 | ifp_dep = ifp; |
1887 | |
1888 | IFA_UNLOCK(ifa); |
1889 | continue; |
1890 | } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && |
1891 | allow_deprecated != 0) { |
1892 | IFA_UNLOCK(ifa); |
1893 | continue; /* we now collect deprecated addrs */ |
1894 | } |
1895 | /* What do we have to do about ::1? */ |
1896 | switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { |
1897 | case IPV6_ADDR_SCOPE_LINKLOCAL: |
1898 | if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) { |
1899 | IFA_UNLOCK(ifa); |
1900 | continue; |
1901 | } |
1902 | break; |
1903 | case IPV6_ADDR_SCOPE_SITELOCAL: |
1904 | if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { |
1905 | IFA_UNLOCK(ifa); |
1906 | continue; |
1907 | } |
1908 | break; |
1909 | case IPV6_ADDR_SCOPE_GLOBAL: |
1910 | if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { |
1911 | IFA_UNLOCK(ifa); |
1912 | continue; |
1913 | } |
1914 | break; |
1915 | default: |
1916 | IFA_UNLOCK(ifa); |
1917 | continue; |
1918 | } |
1919 | |
1920 | /* |
1921 | * check if anycast is okay. |
1922 | * XXX: just experimental. not in the spec. |
1923 | */ |
1924 | if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && |
1925 | (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) { |
1926 | IFA_UNLOCK(ifa); |
1927 | continue; |
1928 | } |
1929 | if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && |
1930 | (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { |
1931 | IFA_UNLOCK(ifa); |
1932 | continue; |
1933 | } |
1934 | |
1935 | /* now we can copy the address */ |
1936 | if (resid < sizeof(struct in6_addr) + |
1937 | sizeof(u_int32_t)) { |
1938 | IFA_UNLOCK(ifa); |
1939 | /* |
1940 | * We give up much more copy. |
1941 | * Set the truncate flag and return. |
1942 | */ |
1943 | nni6->ni_flags |= |
1944 | NI_NODEADDR_FLAG_TRUNCATE; |
1945 | ifnet_lock_done(ifp); |
1946 | ifnet_head_done(); |
1947 | return(copied); |
1948 | } |
1949 | |
1950 | /* |
1951 | * Set the TTL of the address. |
1952 | * The TTL value should be one of the following |
1953 | * according to the specification: |
1954 | * |
1955 | * 1. The remaining lifetime of a DHCP lease on the |
1956 | * address, or |
1957 | * 2. The remaining Valid Lifetime of a prefix from |
1958 | * which the address was derived through Stateless |
1959 | * Autoconfiguration. |
1960 | * |
1961 | * Note that we currently do not support stateful |
1962 | * address configuration by DHCPv6, so the former |
1963 | * case can't happen. |
1964 | */ |
1965 | lt = &ifa6->ia6_lifetime; |
1966 | if (lt->ia6ti_expire == 0) { |
1967 | ltime = ND6_INFINITE_LIFETIME; |
1968 | } else { |
1969 | if (lt->ia6ti_expire > now) |
1970 | ltime = htonl(lt->ia6ti_expire - now); |
1971 | else |
1972 | ltime = 0; |
1973 | } |
1974 | |
1975 | bcopy(<ime, cp, sizeof(u_int32_t)); |
1976 | cp += sizeof(u_int32_t); |
1977 | |
1978 | /* copy the address itself */ |
1979 | bcopy(&ifa6->ia_addr.sin6_addr, cp, |
1980 | sizeof(struct in6_addr)); |
1981 | /* XXX: KAME link-local hack; remove ifindex */ |
1982 | if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) |
1983 | ((struct in6_addr *)(void *)cp)->s6_addr16[1] = 0; |
1984 | cp += sizeof(struct in6_addr); |
1985 | |
1986 | resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); |
1987 | copied += (sizeof(struct in6_addr) + |
1988 | sizeof(u_int32_t)); |
1989 | IFA_UNLOCK(ifa); |
1990 | } |
1991 | ifnet_lock_done(ifp); |
1992 | if (ifp0) /* we need search only on the specified IF */ |
1993 | break; |
1994 | } |
1995 | ifnet_head_done(); |
1996 | |
1997 | if (allow_deprecated == 0 && ifp_dep != NULL) { |
1998 | ifp = ifp_dep; |
1999 | allow_deprecated = 1; |
2000 | |
2001 | goto again; |
2002 | } |
2003 | |
2004 | return(copied); |
2005 | } |
2006 | |
2007 | /* |
2008 | * XXX almost dup'ed code with rip6_input. |
2009 | */ |
2010 | static int |
2011 | icmp6_rip6_input(struct mbuf **mp, int off) |
2012 | { |
2013 | struct mbuf *m = *mp; |
2014 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
2015 | struct in6pcb *in6p; |
2016 | struct in6pcb *last = NULL; |
2017 | struct sockaddr_in6 rip6src; |
2018 | struct icmp6_hdr *icmp6; |
2019 | struct mbuf *opts = NULL; |
2020 | int ret = 0; |
2021 | struct ifnet *ifp = m->m_pkthdr.rcvif; |
2022 | |
2023 | #ifndef PULLDOWN_TEST |
2024 | /* this is assumed to be safe. */ |
2025 | icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); |
2026 | #else |
2027 | IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); |
2028 | if (icmp6 == NULL) { |
2029 | /* m is already reclaimed */ |
2030 | return IPPROTO_DONE; |
2031 | } |
2032 | #endif |
2033 | |
2034 | /* |
2035 | * XXX: the address may have embedded scope zone ID, which should be |
2036 | * hidden from applications. |
2037 | */ |
2038 | bzero(&rip6src, sizeof(rip6src)); |
2039 | rip6src.sin6_family = AF_INET6; |
2040 | rip6src.sin6_len = sizeof(struct sockaddr_in6); |
2041 | rip6src.sin6_addr = ip6->ip6_src; |
2042 | if (sa6_recoverscope(&rip6src, TRUE)) |
2043 | return (IPPROTO_DONE); |
2044 | |
2045 | lck_rw_lock_shared(ripcbinfo.ipi_lock); |
2046 | LIST_FOREACH(in6p, &ripcb, inp_list) |
2047 | { |
2048 | if ((in6p->inp_vflag & INP_IPV6) == 0) |
2049 | continue; |
2050 | if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) |
2051 | continue; |
2052 | if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && |
2053 | !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) |
2054 | continue; |
2055 | if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && |
2056 | !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) |
2057 | continue; |
2058 | if (in6p->in6p_icmp6filt |
2059 | && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, |
2060 | in6p->in6p_icmp6filt)) |
2061 | continue; |
2062 | |
2063 | if (inp_restricted_recv(in6p, ifp)) |
2064 | continue; |
2065 | |
2066 | if (last) { |
2067 | struct mbuf *n; |
2068 | if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { |
2069 | if ((last->in6p_flags & INP_CONTROLOPTS) != 0 || |
2070 | (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || |
2071 | (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 || |
2072 | (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { |
2073 | ret = ip6_savecontrol(last, n, &opts); |
2074 | if (ret != 0) { |
2075 | m_freem(n); |
2076 | m_freem(opts); |
2077 | last = in6p; |
2078 | continue; |
2079 | } |
2080 | } |
2081 | /* strip intermediate headers */ |
2082 | m_adj(n, off); |
2083 | so_recv_data_stat(last->in6p_socket, m, 0); |
2084 | if (sbappendaddr(&last->in6p_socket->so_rcv, |
2085 | (struct sockaddr *)&rip6src, |
2086 | n, opts, NULL) != 0) { |
2087 | sorwakeup(last->in6p_socket); |
2088 | } |
2089 | opts = NULL; |
2090 | } |
2091 | } |
2092 | last = in6p; |
2093 | } |
2094 | if (last) { |
2095 | if ((last->in6p_flags & INP_CONTROLOPTS) != 0 || |
2096 | (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || |
2097 | (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 || |
2098 | (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { |
2099 | ret = ip6_savecontrol(last, m, &opts); |
2100 | if (ret != 0) { |
2101 | goto error; |
2102 | } |
2103 | } |
2104 | /* strip intermediate headers */ |
2105 | m_adj(m, off); |
2106 | so_recv_data_stat(last->in6p_socket, m, 0); |
2107 | if (sbappendaddr(&last->in6p_socket->so_rcv, |
2108 | (struct sockaddr *)&rip6src, m, opts, NULL) != 0) { |
2109 | sorwakeup(last->in6p_socket); |
2110 | } |
2111 | } else { |
2112 | goto error; |
2113 | } |
2114 | lck_rw_done(ripcbinfo.ipi_lock); |
2115 | return IPPROTO_DONE; |
2116 | |
2117 | error: |
2118 | lck_rw_done(ripcbinfo.ipi_lock); |
2119 | m_freem(m); |
2120 | m_freem(opts); |
2121 | ip6stat.ip6s_delivered--; |
2122 | return IPPROTO_DONE; |
2123 | } |
2124 | |
2125 | /* |
2126 | * Reflect the ip6 packet back to the source. |
2127 | * OFF points to the icmp6 header, counted from the top of the mbuf. |
2128 | */ |
2129 | void |
2130 | icmp6_reflect(struct mbuf *m, size_t off) |
2131 | { |
2132 | struct mbuf *m_ip6hdr = m; |
2133 | struct ip6_hdr *ip6; |
2134 | struct icmp6_hdr *icmp6; |
2135 | struct in6_ifaddr *ia; |
2136 | struct in6_addr t, src_storage, *src = 0; |
2137 | int plen; |
2138 | int type, code; |
2139 | struct ifnet *outif = NULL; |
2140 | struct sockaddr_in6 sa6_src, sa6_dst; |
2141 | struct nd_ifinfo *ndi = NULL; |
2142 | u_int32_t oflow; |
2143 | struct ip6_out_args ip6oa; |
2144 | |
2145 | bzero(&ip6oa, sizeof(ip6oa)); |
2146 | ip6oa.ip6oa_boundif = IFSCOPE_NONE; |
2147 | ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR | |
2148 | IP6OAF_INTCOPROC_ALLOWED | IP6OAF_AWDL_UNRESTRICTED; |
2149 | ip6oa.ip6oa_sotc = SO_TC_UNSPEC; |
2150 | ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC; |
2151 | |
2152 | if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && m->m_pkthdr.rcvif != NULL) { |
2153 | ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index; |
2154 | ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; |
2155 | } |
2156 | |
2157 | /* too short to reflect */ |
2158 | if (off < sizeof(struct ip6_hdr)) { |
2159 | nd6log((LOG_DEBUG, |
2160 | "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n" , |
2161 | (u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr), |
2162 | __func__, __LINE__)); |
2163 | goto bad; |
2164 | } |
2165 | |
2166 | /* |
2167 | * If there are extra headers between IPv6 and ICMPv6, strip |
2168 | * off that header first. |
2169 | */ |
2170 | if (off > sizeof(struct ip6_hdr)) { |
2171 | size_t l; |
2172 | struct ip6_hdr nip6; |
2173 | |
2174 | l = off - sizeof(struct ip6_hdr); |
2175 | m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); |
2176 | m_adj(m, l); |
2177 | l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
2178 | if (m->m_len < l) { |
2179 | if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL) |
2180 | return; |
2181 | } |
2182 | bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); |
2183 | } else /* off == sizeof(struct ip6_hdr) */ { |
2184 | size_t l; |
2185 | l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); |
2186 | if (m->m_len < l) { |
2187 | if ((m_ip6hdr = m_pulldown(m, 0, l, NULL)) == NULL) |
2188 | return; |
2189 | } |
2190 | } |
2191 | plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); |
2192 | ip6 = mtod(m_ip6hdr, struct ip6_hdr *); |
2193 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
2194 | icmp6 = (struct icmp6_hdr *)(ip6 + 1); |
2195 | type = icmp6->icmp6_type; /* keep type for statistics */ |
2196 | code = icmp6->icmp6_code; /* ditto. */ |
2197 | |
2198 | t = ip6->ip6_dst; |
2199 | /* |
2200 | * ip6_input() drops a packet if its src is multicast. |
2201 | * So, the src is never multicast. |
2202 | */ |
2203 | ip6->ip6_dst = ip6->ip6_src; |
2204 | |
2205 | /* |
2206 | * XXX: make sure to embed scope zone information, using |
2207 | * already embedded IDs or the received interface (if any). |
2208 | * Note that rcvif may be NULL. |
2209 | */ |
2210 | bzero(&sa6_src, sizeof(sa6_src)); |
2211 | sa6_src.sin6_family = AF_INET6; |
2212 | sa6_src.sin6_len = sizeof(sa6_src); |
2213 | sa6_src.sin6_addr = ip6->ip6_dst; |
2214 | in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); |
2215 | in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL); |
2216 | bzero(&sa6_dst, sizeof(sa6_dst)); |
2217 | sa6_dst.sin6_family = AF_INET6; |
2218 | sa6_dst.sin6_len = sizeof(sa6_dst); |
2219 | sa6_dst.sin6_addr = t; |
2220 | in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); |
2221 | in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL); |
2222 | |
2223 | /* |
2224 | * If the incoming packet was addressed directly to us(i.e. unicast), |
2225 | * use dst as the src for the reply. |
2226 | * The IN6_IFF_NOTREADY case should be VERY rare, but is possible |
2227 | * (for example) when we encounter an error while forwarding procedure |
2228 | * destined to a duplicated address of ours. |
2229 | * Note that ip6_getdstifaddr() may fail if we are in an error handling |
2230 | * procedure of an outgoing packet of our own, in which case we need |
2231 | * to search in the ifaddr list. |
2232 | */ |
2233 | lck_rw_lock_shared(&in6_ifaddr_rwlock); |
2234 | for (ia = in6_ifaddrs; ia; ia = ia->ia_next) { |
2235 | IFA_LOCK(&ia->ia_ifa); |
2236 | if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && |
2237 | (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_CLAT46)) == 0) { |
2238 | IFA_UNLOCK(&ia->ia_ifa); |
2239 | src = &t; |
2240 | break; |
2241 | } |
2242 | IFA_UNLOCK(&ia->ia_ifa); |
2243 | } |
2244 | lck_rw_done(&in6_ifaddr_rwlock); |
2245 | if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && |
2246 | ((m->m_flags & M_LOOP) || (m->m_pkthdr.pkt_flags & PKTF_LOOP))) { |
2247 | /* |
2248 | * This is the case if the dst is our link-local address |
2249 | * and the sender is also ourselves. Here we test for both |
2250 | * M_LOOP and PKTF_LOOP, since the former may have been set |
2251 | * in ip6_output() and that we get here as part of callling |
2252 | * ip6_process_hopopts(). See comments in <sys/mbuf.h> |
2253 | */ |
2254 | src = &t; |
2255 | } |
2256 | |
2257 | if (src == NULL) { |
2258 | int e; |
2259 | struct sockaddr_in6 sin6; |
2260 | struct route_in6 ro; |
2261 | |
2262 | /* |
2263 | * This case matches to multicasts, our anycast, or unicasts |
2264 | * that we do not own. Select a source address based on the |
2265 | * source address of the erroneous packet. |
2266 | */ |
2267 | bzero(&sin6, sizeof(sin6)); |
2268 | sin6.sin6_family = AF_INET6; |
2269 | sin6.sin6_len = sizeof(sin6); |
2270 | sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ |
2271 | |
2272 | bzero(&ro, sizeof(ro)); |
2273 | /* |
2274 | * in6_selectsrc() might return outif with its reference held |
2275 | * even in the error case, so we always need to release it |
2276 | * if non-NULL. |
2277 | */ |
2278 | src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif, |
2279 | &src_storage, ip6oa.ip6oa_boundif, &e); |
2280 | ROUTE_RELEASE(&ro); |
2281 | if (src == NULL) { |
2282 | nd6log((LOG_DEBUG, |
2283 | "icmp6_reflect: source can't be determined: " |
2284 | "dst=%s, error=%d\n" , |
2285 | ip6_sprintf(&sa6_src.sin6_addr), e)); |
2286 | goto bad; |
2287 | } |
2288 | } |
2289 | oflow = ip6->ip6_flow; /* Save for later */ |
2290 | ip6->ip6_src = *src; |
2291 | ip6->ip6_flow = 0; |
2292 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
2293 | ip6->ip6_vfc |= IPV6_VERSION; |
2294 | if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) { |
2295 | ip6->ip6_flow |= (oflow & htonl(0x0ff00000)); |
2296 | } |
2297 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
2298 | if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL && |
2299 | ndi->initialized) { |
2300 | lck_mtx_lock(&ndi->lock); |
2301 | ip6->ip6_hlim = ndi->chlim; |
2302 | lck_mtx_unlock(&ndi->lock); |
2303 | } |
2304 | if (m->m_pkthdr.rcvif != NULL && |
2305 | (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL && |
2306 | ndi->initialized) { |
2307 | /* XXX: This may not be the outgoing interface */ |
2308 | lck_mtx_lock(&ndi->lock); |
2309 | ip6->ip6_hlim = ndi->chlim; |
2310 | lck_mtx_unlock(&ndi->lock); |
2311 | } else { |
2312 | ip6->ip6_hlim = ip6_defhlim; |
2313 | } |
2314 | /* Use the same traffic class as in the request to match IPv4 */ |
2315 | icmp6->icmp6_cksum = 0; |
2316 | icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, |
2317 | sizeof(struct ip6_hdr), plen); |
2318 | |
2319 | /* |
2320 | * XXX option handling |
2321 | */ |
2322 | m->m_flags &= ~(M_BCAST|M_MCAST); |
2323 | |
2324 | if (outif != NULL) { |
2325 | ifnet_release(outif); |
2326 | outif = NULL; |
2327 | } |
2328 | |
2329 | m->m_pkthdr.csum_data = 0; |
2330 | m->m_pkthdr.csum_flags = 0; |
2331 | ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); |
2332 | if (outif != NULL) { |
2333 | icmp6_ifoutstat_inc(outif, type, code); |
2334 | ifnet_release(outif); |
2335 | } |
2336 | return; |
2337 | |
2338 | bad: |
2339 | m_freem(m); |
2340 | if (outif != NULL) |
2341 | ifnet_release(outif); |
2342 | return; |
2343 | } |
2344 | |
2345 | static const char * |
2346 | icmp6_redirect_diag(struct in6_addr *src6, |
2347 | struct in6_addr *dst6, |
2348 | struct in6_addr *tgt6) |
2349 | { |
2350 | static char buf[1024]; |
2351 | snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)" , |
2352 | ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); |
2353 | return buf; |
2354 | } |
2355 | |
2356 | void |
2357 | icmp6_redirect_input(struct mbuf *m, int off) |
2358 | { |
2359 | struct ifnet *ifp = m->m_pkthdr.rcvif; |
2360 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
2361 | struct nd_redirect *nd_rd; |
2362 | int icmp6len = ntohs(ip6->ip6_plen); |
2363 | char *lladdr = NULL; |
2364 | int lladdrlen = 0; |
2365 | u_char *redirhdr = NULL; |
2366 | int redirhdrlen = 0; |
2367 | struct rtentry *rt = NULL; |
2368 | int is_router; |
2369 | int is_onlink; |
2370 | struct in6_addr src6 = ip6->ip6_src; |
2371 | struct in6_addr redtgt6; |
2372 | struct in6_addr reddst6; |
2373 | union nd_opts ndopts; |
2374 | |
2375 | if (!m || !ifp) |
2376 | return; |
2377 | |
2378 | /* |
2379 | * If we are an advertising router on this interface, |
2380 | * don't update route by icmp6 redirect. |
2381 | */ |
2382 | if (ifp->if_eflags & IFEF_IPV6_ROUTER) |
2383 | goto freeit; |
2384 | if (!icmp6_rediraccept) |
2385 | goto freeit; |
2386 | |
2387 | #ifndef PULLDOWN_TEST |
2388 | IP6_EXTHDR_CHECK(m, off, icmp6len, return); |
2389 | nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); |
2390 | #else |
2391 | IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); |
2392 | if (nd_rd == NULL) { |
2393 | icmp6stat.icp6s_tooshort++; |
2394 | return; |
2395 | } |
2396 | #endif |
2397 | redtgt6 = nd_rd->nd_rd_target; |
2398 | reddst6 = nd_rd->nd_rd_dst; |
2399 | |
2400 | if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || |
2401 | in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { |
2402 | goto freeit; |
2403 | } |
2404 | |
2405 | /* validation */ |
2406 | if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { |
2407 | nd6log((LOG_ERR, |
2408 | "ICMP6 redirect sent from %s rejected; " |
2409 | "must be from linklocal\n" , ip6_sprintf(&src6))); |
2410 | goto bad; |
2411 | } |
2412 | if (ip6->ip6_hlim != 255) { |
2413 | nd6log((LOG_ERR, |
2414 | "ICMP6 redirect sent from %s rejected; " |
2415 | "hlim=%d (must be 255)\n" , |
2416 | ip6_sprintf(&src6), ip6->ip6_hlim)); |
2417 | goto bad; |
2418 | } |
2419 | { |
2420 | /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ |
2421 | struct sockaddr_in6 sin6; |
2422 | struct in6_addr *gw6; |
2423 | |
2424 | bzero(&sin6, sizeof(sin6)); |
2425 | sin6.sin6_family = AF_INET6; |
2426 | sin6.sin6_len = sizeof(struct sockaddr_in6); |
2427 | bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); |
2428 | rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index); |
2429 | if (rt) { |
2430 | RT_LOCK(rt); |
2431 | if (rt->rt_gateway == NULL || |
2432 | rt->rt_gateway->sa_family != AF_INET6) { |
2433 | nd6log((LOG_ERR, |
2434 | "ICMP6 redirect rejected; no route " |
2435 | "with inet6 gateway found for redirect dst: %s\n" , |
2436 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2437 | RT_UNLOCK(rt); |
2438 | rtfree(rt); |
2439 | goto bad; |
2440 | } |
2441 | |
2442 | gw6 = &(((struct sockaddr_in6 *)(void *) |
2443 | rt->rt_gateway)->sin6_addr); |
2444 | if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { |
2445 | nd6log((LOG_ERR, |
2446 | "ICMP6 redirect rejected; " |
2447 | "not equal to gw-for-src=%s (must be same): " |
2448 | "%s\n" , |
2449 | ip6_sprintf(gw6), |
2450 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2451 | RT_UNLOCK(rt); |
2452 | rtfree(rt); |
2453 | goto bad; |
2454 | } |
2455 | } else { |
2456 | nd6log((LOG_ERR, |
2457 | "ICMP6 redirect rejected; " |
2458 | "no route found for redirect dst: %s\n" , |
2459 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2460 | goto bad; |
2461 | } |
2462 | RT_UNLOCK(rt); |
2463 | rtfree(rt); |
2464 | rt = NULL; |
2465 | } |
2466 | if (IN6_IS_ADDR_MULTICAST(&reddst6)) { |
2467 | nd6log((LOG_ERR, |
2468 | "ICMP6 redirect rejected; " |
2469 | "redirect dst must be unicast: %s\n" , |
2470 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2471 | goto bad; |
2472 | } |
2473 | |
2474 | is_router = is_onlink = 0; |
2475 | if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) |
2476 | is_router = 1; /* router case */ |
2477 | if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) |
2478 | is_onlink = 1; /* on-link destination case */ |
2479 | if (!is_router && !is_onlink) { |
2480 | nd6log((LOG_ERR, |
2481 | "ICMP6 redirect rejected; " |
2482 | "neither router case nor onlink case: %s\n" , |
2483 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2484 | goto bad; |
2485 | } |
2486 | /* validation passed */ |
2487 | |
2488 | icmp6len -= sizeof(*nd_rd); |
2489 | nd6_option_init(nd_rd + 1, icmp6len, &ndopts); |
2490 | if (nd6_options(&ndopts) < 0) { |
2491 | nd6log((LOG_INFO, "icmp6_redirect_input: " |
2492 | "invalid ND option, rejected: %s\n" , |
2493 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2494 | /* nd6_options have incremented stats */ |
2495 | goto freeit; |
2496 | } |
2497 | |
2498 | if (ndopts.nd_opts_tgt_lladdr) { |
2499 | lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); |
2500 | lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; |
2501 | } |
2502 | |
2503 | if (ndopts.nd_opts_rh) { |
2504 | redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; |
2505 | redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ |
2506 | } |
2507 | |
2508 | if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { |
2509 | nd6log((LOG_INFO, |
2510 | "icmp6_redirect_input: lladdrlen mismatch for %s " |
2511 | "(if %d, icmp6 packet %d): %s\n" , |
2512 | ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, |
2513 | icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); |
2514 | goto bad; |
2515 | } |
2516 | |
2517 | /* RFC 2461 8.3 */ |
2518 | nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, |
2519 | is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); |
2520 | |
2521 | if (!is_onlink) { /* better router case. perform rtredirect. */ |
2522 | /* perform rtredirect */ |
2523 | struct sockaddr_in6 sdst; |
2524 | struct sockaddr_in6 sgw; |
2525 | struct sockaddr_in6 ssrc; |
2526 | |
2527 | bzero(&sdst, sizeof(sdst)); |
2528 | bzero(&sgw, sizeof(sgw)); |
2529 | bzero(&ssrc, sizeof(ssrc)); |
2530 | sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; |
2531 | sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = |
2532 | sizeof(struct sockaddr_in6); |
2533 | bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); |
2534 | bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); |
2535 | bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); |
2536 | rtredirect(ifp, (struct sockaddr *)&sdst, |
2537 | (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST, |
2538 | (struct sockaddr *)&ssrc, NULL); |
2539 | } |
2540 | /* finally update cached route in each socket via pfctlinput */ |
2541 | { |
2542 | struct sockaddr_in6 sdst; |
2543 | |
2544 | bzero(&sdst, sizeof(sdst)); |
2545 | sdst.sin6_family = AF_INET6; |
2546 | sdst.sin6_len = sizeof(struct sockaddr_in6); |
2547 | bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); |
2548 | |
2549 | pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); |
2550 | #if IPSEC |
2551 | key_sa_routechange((struct sockaddr *)&sdst); |
2552 | #endif |
2553 | } |
2554 | |
2555 | freeit: |
2556 | m_freem(m); |
2557 | return; |
2558 | |
2559 | bad: |
2560 | icmp6stat.icp6s_badredirect++; |
2561 | m_freem(m); |
2562 | } |
2563 | |
2564 | void |
2565 | icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) |
2566 | { |
2567 | struct ifnet *ifp; /* my outgoing interface */ |
2568 | struct in6_addr ifp_ll6; |
2569 | struct in6_addr *router_ll6; |
2570 | struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ |
2571 | struct mbuf *m = NULL; /* newly allocated one */ |
2572 | struct ip6_hdr *ip6; /* m as struct ip6_hdr */ |
2573 | struct nd_redirect *nd_rd; |
2574 | size_t maxlen; |
2575 | u_char *p; |
2576 | struct ifnet *outif = NULL; |
2577 | struct sockaddr_in6 src_sa; |
2578 | struct ip6_out_args ip6oa; |
2579 | |
2580 | bzero(&ip6oa, sizeof(ip6oa)); |
2581 | ip6oa.ip6oa_boundif = IFSCOPE_NONE; |
2582 | ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR; |
2583 | ip6oa.ip6oa_sotc = SO_TC_UNSPEC; |
2584 | ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC; |
2585 | |
2586 | icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); |
2587 | |
2588 | if (rt != NULL) |
2589 | RT_LOCK(rt); |
2590 | |
2591 | /* sanity check */ |
2592 | if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) |
2593 | goto fail; |
2594 | |
2595 | /* |
2596 | * If we are not a router to begin with, or not an advertising |
2597 | * router on this interface, don't send icmp6 redirect. |
2598 | */ |
2599 | if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER)) |
2600 | goto fail; |
2601 | |
2602 | /* |
2603 | * Address check: |
2604 | * the source address must identify a neighbor, and |
2605 | * the destination address must not be a multicast address |
2606 | * [RFC 2461, sec 8.2] |
2607 | */ |
2608 | sip6 = mtod(m0, struct ip6_hdr *); |
2609 | bzero(&src_sa, sizeof(src_sa)); |
2610 | src_sa.sin6_family = AF_INET6; |
2611 | src_sa.sin6_len = sizeof(src_sa); |
2612 | src_sa.sin6_addr = sip6->ip6_src; |
2613 | /* we don't currently use sin6_scope_id, but eventually use it */ |
2614 | src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); |
2615 | RT_UNLOCK(rt); |
2616 | if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) { |
2617 | /* already unlocked */ |
2618 | rt = NULL; |
2619 | goto fail; |
2620 | } |
2621 | RT_LOCK(rt); |
2622 | if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) |
2623 | goto fail; /* what should we do here? */ |
2624 | |
2625 | /* rate limit */ |
2626 | if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) |
2627 | goto fail; |
2628 | |
2629 | /* |
2630 | * Since we are going to append up to 1280 bytes (= IPV6_MMTU), |
2631 | * we almost always ask for an mbuf cluster for simplicity. |
2632 | * (MHLEN < IPV6_MMTU is almost always true) |
2633 | */ |
2634 | #if IPV6_MMTU >= MCLBYTES |
2635 | # error assumption failed about IPV6_MMTU and MCLBYTES |
2636 | #endif |
2637 | MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */ |
2638 | if (m && IPV6_MMTU >= MHLEN) |
2639 | MCLGET(m, M_DONTWAIT); |
2640 | if (!m) |
2641 | goto fail; |
2642 | m->m_pkthdr.rcvif = NULL; |
2643 | m->m_len = 0; |
2644 | maxlen = M_TRAILINGSPACE(m); |
2645 | maxlen = min(IPV6_MMTU, maxlen); |
2646 | /* just for safety */ |
2647 | if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + |
2648 | ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { |
2649 | goto fail; |
2650 | } |
2651 | |
2652 | { |
2653 | /* get ip6 linklocal address for ifp(my outgoing interface). */ |
2654 | struct in6_ifaddr *ia; |
2655 | if ((ia = in6ifa_ifpforlinklocal(ifp, |
2656 | IN6_IFF_NOTREADY| |
2657 | IN6_IFF_ANYCAST)) == NULL) |
2658 | goto fail; |
2659 | IFA_LOCK(&ia->ia_ifa); |
2660 | ifp_ll6 = ia->ia_addr.sin6_addr; |
2661 | IFA_UNLOCK(&ia->ia_ifa); |
2662 | IFA_REMREF(&ia->ia_ifa); |
2663 | } |
2664 | |
2665 | /* get ip6 linklocal address for the router. */ |
2666 | if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { |
2667 | struct sockaddr_in6 *sin6; |
2668 | sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway; |
2669 | router_ll6 = &sin6->sin6_addr; |
2670 | if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) |
2671 | router_ll6 = (struct in6_addr *)NULL; |
2672 | } else |
2673 | router_ll6 = (struct in6_addr *)NULL; |
2674 | |
2675 | /* ip6 */ |
2676 | ip6 = mtod(m, struct ip6_hdr *); |
2677 | ip6->ip6_flow = 0; |
2678 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
2679 | ip6->ip6_vfc |= IPV6_VERSION; |
2680 | /* ip6->ip6_plen will be set later */ |
2681 | ip6->ip6_nxt = IPPROTO_ICMPV6; |
2682 | ip6->ip6_hlim = 255; |
2683 | /* ip6->ip6_src must be linklocal addr for my outgoing if. */ |
2684 | bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); |
2685 | bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); |
2686 | |
2687 | /* ND Redirect */ |
2688 | nd_rd = (struct nd_redirect *)(ip6 + 1); |
2689 | nd_rd->nd_rd_type = ND_REDIRECT; |
2690 | nd_rd->nd_rd_code = 0; |
2691 | nd_rd->nd_rd_reserved = 0; |
2692 | if (rt->rt_flags & RTF_GATEWAY) { |
2693 | /* |
2694 | * nd_rd->nd_rd_target must be a link-local address in |
2695 | * better router cases. |
2696 | */ |
2697 | if (!router_ll6) |
2698 | goto fail; |
2699 | bcopy(router_ll6, &nd_rd->nd_rd_target, |
2700 | sizeof(nd_rd->nd_rd_target)); |
2701 | bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, |
2702 | sizeof(nd_rd->nd_rd_dst)); |
2703 | } else { |
2704 | /* make sure redtgt == reddst */ |
2705 | bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, |
2706 | sizeof(nd_rd->nd_rd_target)); |
2707 | bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, |
2708 | sizeof(nd_rd->nd_rd_dst)); |
2709 | } |
2710 | RT_UNLOCK(rt); |
2711 | rt = NULL; |
2712 | |
2713 | p = (u_char *)(nd_rd + 1); |
2714 | |
2715 | if (!router_ll6) |
2716 | goto nolladdropt; |
2717 | |
2718 | { |
2719 | /* target lladdr option */ |
2720 | struct rtentry *rt_router = NULL; |
2721 | int len; |
2722 | struct sockaddr_dl *sdl; |
2723 | struct nd_opt_hdr *nd_opt; |
2724 | char *lladdr; |
2725 | |
2726 | /* Callee returns a locked route upon success */ |
2727 | rt_router = nd6_lookup(router_ll6, 0, ifp, 0); |
2728 | if (!rt_router) |
2729 | goto nolladdropt; |
2730 | RT_LOCK_ASSERT_HELD(rt_router); |
2731 | len = sizeof(*nd_opt) + ifp->if_addrlen; |
2732 | len = (len + 7) & ~7; /* round by 8 */ |
2733 | /* safety check */ |
2734 | if (len + (p - (u_char *)ip6) > maxlen) { |
2735 | RT_REMREF_LOCKED(rt_router); |
2736 | RT_UNLOCK(rt_router); |
2737 | goto nolladdropt; |
2738 | } |
2739 | |
2740 | if (!(rt_router->rt_flags & RTF_GATEWAY) && |
2741 | (rt_router->rt_flags & RTF_LLINFO) && |
2742 | (rt_router->rt_gateway->sa_family == AF_LINK) && |
2743 | (sdl = (struct sockaddr_dl *)(void *) |
2744 | rt_router->rt_gateway) && sdl->sdl_alen) { |
2745 | nd_opt = (struct nd_opt_hdr *)p; |
2746 | nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; |
2747 | nd_opt->nd_opt_len = len >> 3; |
2748 | lladdr = (char *)(nd_opt + 1); |
2749 | bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); |
2750 | p += len; |
2751 | } |
2752 | RT_REMREF_LOCKED(rt_router); |
2753 | RT_UNLOCK(rt_router); |
2754 | } |
2755 | |
2756 | nolladdropt:; |
2757 | |
2758 | m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; |
2759 | |
2760 | /* just to be safe */ |
2761 | #ifdef M_DECRYPTED /*not openbsd*/ |
2762 | if (m0->m_flags & M_DECRYPTED) |
2763 | goto noredhdropt; |
2764 | #endif |
2765 | if (p - (u_char *)ip6 > maxlen) |
2766 | goto noredhdropt; |
2767 | |
2768 | { |
2769 | /* redirected header option */ |
2770 | int len; |
2771 | struct nd_opt_rd_hdr *nd_opt_rh; |
2772 | |
2773 | /* |
2774 | * compute the maximum size for icmp6 redirect header option. |
2775 | * XXX room for auth header? |
2776 | */ |
2777 | len = maxlen - (p - (u_char *)ip6); |
2778 | len &= ~7; |
2779 | |
2780 | /* This is just for simplicity. */ |
2781 | if (m0->m_pkthdr.len != m0->m_len) { |
2782 | if (m0->m_next) { |
2783 | m_freem(m0->m_next); |
2784 | m0->m_next = NULL; |
2785 | } |
2786 | m0->m_pkthdr.len = m0->m_len; |
2787 | } |
2788 | |
2789 | /* |
2790 | * Redirected header option spec (RFC2461 4.6.3) talks nothing |
2791 | * about padding/truncate rule for the original IP packet. |
2792 | * From the discussion on IPv6imp in Feb 1999, the consensus was: |
2793 | * - "attach as much as possible" is the goal |
2794 | * - pad if not aligned (original size can be guessed by original |
2795 | * ip6 header) |
2796 | * Following code adds the padding if it is simple enough, |
2797 | * and truncates if not. |
2798 | */ |
2799 | if (m0->m_next || m0->m_pkthdr.len != m0->m_len) |
2800 | panic("assumption failed in %s:%d\n" , __func__, __LINE__); |
2801 | |
2802 | if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { |
2803 | /* not enough room, truncate */ |
2804 | m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); |
2805 | } else { |
2806 | /* enough room, pad or truncate */ |
2807 | size_t ; |
2808 | |
2809 | extra = m0->m_pkthdr.len % 8; |
2810 | if (extra) { |
2811 | /* pad if easy enough, truncate if not */ |
2812 | if (8 - extra <= M_TRAILINGSPACE(m0)) { |
2813 | /* pad */ |
2814 | m0->m_len += (8 - extra); |
2815 | m0->m_pkthdr.len += (8 - extra); |
2816 | } else { |
2817 | /* truncate */ |
2818 | m0->m_pkthdr.len -= extra; |
2819 | m0->m_len -= extra; |
2820 | } |
2821 | } |
2822 | len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); |
2823 | m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); |
2824 | } |
2825 | |
2826 | nd_opt_rh = (struct nd_opt_rd_hdr *)p; |
2827 | bzero(nd_opt_rh, sizeof(*nd_opt_rh)); |
2828 | nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; |
2829 | nd_opt_rh->nd_opt_rh_len = len >> 3; |
2830 | p += sizeof(*nd_opt_rh); |
2831 | m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; |
2832 | |
2833 | /* connect m0 to m */ |
2834 | m->m_next = m0; |
2835 | m->m_pkthdr.len = m->m_len + m0->m_len; |
2836 | } |
2837 | noredhdropt:; |
2838 | |
2839 | /* XXX: clear embedded link IDs in the inner header */ |
2840 | in6_clearscope(&sip6->ip6_src); |
2841 | in6_clearscope(&sip6->ip6_dst); |
2842 | in6_clearscope(&nd_rd->nd_rd_target); |
2843 | in6_clearscope(&nd_rd->nd_rd_dst); |
2844 | |
2845 | ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); |
2846 | |
2847 | nd_rd->nd_rd_cksum = 0; |
2848 | nd_rd->nd_rd_cksum |
2849 | = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); |
2850 | |
2851 | /* send the packet to outside... */ |
2852 | ip6oa.ip6oa_boundif = ifp->if_index; |
2853 | ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; |
2854 | |
2855 | ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); |
2856 | if (outif) { |
2857 | icmp6_ifstat_inc(outif, ifs6_out_msg); |
2858 | icmp6_ifstat_inc(outif, ifs6_out_redirect); |
2859 | ifnet_release(outif); |
2860 | } |
2861 | icmp6stat.icp6s_outhist[ND_REDIRECT]++; |
2862 | |
2863 | return; |
2864 | |
2865 | fail: |
2866 | if (rt != NULL) |
2867 | RT_UNLOCK(rt); |
2868 | if (m) |
2869 | m_freem(m); |
2870 | if (m0) |
2871 | m_freem(m0); |
2872 | } |
2873 | |
2874 | /* |
2875 | * ICMPv6 socket option processing. |
2876 | */ |
2877 | int |
2878 | icmp6_ctloutput(struct socket *so, struct sockopt *sopt) |
2879 | { |
2880 | int error = 0; |
2881 | int optlen; |
2882 | struct inpcb *inp = sotoinpcb(so); |
2883 | int level, op, optname; |
2884 | |
2885 | if (sopt) { |
2886 | level = sopt->sopt_level; |
2887 | op = sopt->sopt_dir; |
2888 | optname = sopt->sopt_name; |
2889 | optlen = sopt->sopt_valsize; |
2890 | } else |
2891 | level = op = optname = optlen = 0; |
2892 | |
2893 | if (level != IPPROTO_ICMPV6) { |
2894 | return EINVAL; |
2895 | } |
2896 | |
2897 | switch (op) { |
2898 | case PRCO_SETOPT: |
2899 | switch (optname) { |
2900 | case ICMP6_FILTER: |
2901 | { |
2902 | struct icmp6_filter *p; |
2903 | |
2904 | if (optlen != 0 && optlen != sizeof(*p)) { |
2905 | error = EMSGSIZE; |
2906 | break; |
2907 | } |
2908 | if (inp->in6p_icmp6filt == NULL) { |
2909 | error = EINVAL; |
2910 | break; |
2911 | } |
2912 | |
2913 | if (optlen == 0) { |
2914 | /* According to RFC 3542, an installed filter can be |
2915 | * cleared by issuing a setsockopt for ICMP6_FILTER |
2916 | * with a zero length. |
2917 | */ |
2918 | ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); |
2919 | } else { |
2920 | error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, |
2921 | optlen); |
2922 | } |
2923 | break; |
2924 | } |
2925 | |
2926 | default: |
2927 | error = ENOPROTOOPT; |
2928 | break; |
2929 | } |
2930 | break; |
2931 | |
2932 | case PRCO_GETOPT: |
2933 | switch (optname) { |
2934 | case ICMP6_FILTER: |
2935 | { |
2936 | if (inp->in6p_icmp6filt == NULL) { |
2937 | error = EINVAL; |
2938 | break; |
2939 | } |
2940 | error = sooptcopyout(sopt, inp->in6p_icmp6filt, |
2941 | min(sizeof(struct icmp6_filter), optlen)); |
2942 | break; |
2943 | } |
2944 | |
2945 | default: |
2946 | error = ENOPROTOOPT; |
2947 | break; |
2948 | } |
2949 | break; |
2950 | } |
2951 | |
2952 | return(error); |
2953 | } |
2954 | |
2955 | /* |
2956 | * ICMPv6 socket datagram option processing. |
2957 | */ |
2958 | int |
2959 | icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt) |
2960 | { |
2961 | if (kauth_cred_issuser(so->so_cred)) |
2962 | return icmp6_ctloutput(so, sopt); |
2963 | |
2964 | if (sopt->sopt_level == IPPROTO_ICMPV6) { |
2965 | switch (sopt->sopt_name) { |
2966 | case ICMP6_FILTER: |
2967 | return icmp6_ctloutput(so, sopt); |
2968 | default: |
2969 | return EPERM; |
2970 | } |
2971 | } |
2972 | |
2973 | if (sopt->sopt_level != IPPROTO_IPV6) |
2974 | return EINVAL; |
2975 | |
2976 | switch (sopt->sopt_name) { |
2977 | case IPV6_UNICAST_HOPS: |
2978 | case IPV6_CHECKSUM: |
2979 | case IPV6_V6ONLY: |
2980 | case IPV6_USE_MIN_MTU: |
2981 | case IPV6_RECVRTHDR: |
2982 | case IPV6_RECVPKTINFO: |
2983 | case IPV6_RECVHOPLIMIT: |
2984 | case IPV6_PATHMTU: |
2985 | case IPV6_PKTINFO: |
2986 | case IPV6_HOPLIMIT: |
2987 | case IPV6_HOPOPTS: |
2988 | case IPV6_DSTOPTS: |
2989 | case IPV6_MULTICAST_IF: |
2990 | case IPV6_MULTICAST_HOPS: |
2991 | case IPV6_MULTICAST_LOOP: |
2992 | case IPV6_JOIN_GROUP: |
2993 | case IPV6_LEAVE_GROUP: |
2994 | case IPV6_PORTRANGE: |
2995 | case IPV6_IPSEC_POLICY: |
2996 | case IPV6_RECVTCLASS: |
2997 | case IPV6_TCLASS: |
2998 | case IPV6_2292PKTOPTIONS: |
2999 | case IPV6_2292PKTINFO: |
3000 | case IPV6_2292HOPLIMIT: |
3001 | case IPV6_2292HOPOPTS: |
3002 | case IPV6_2292DSTOPTS: |
3003 | case IPV6_2292RTHDR: |
3004 | case IPV6_BOUND_IF: |
3005 | case IPV6_NO_IFT_CELLULAR: |
3006 | |
3007 | return ip6_ctloutput(so, sopt); |
3008 | |
3009 | default: |
3010 | return EPERM; |
3011 | } |
3012 | } |
3013 | |
3014 | __private_extern__ int |
3015 | icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m, |
3016 | struct sockaddr *nam, struct mbuf *control, struct proc *p) |
3017 | { |
3018 | #pragma unused(flags, p) |
3019 | int error = 0; |
3020 | struct inpcb *inp = sotoinpcb(so); |
3021 | struct sockaddr_in6 tmp; |
3022 | struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam; |
3023 | struct icmp6_hdr *icmp6; |
3024 | |
3025 | if (inp == NULL |
3026 | #if NECP |
3027 | || (necp_socket_should_use_flow_divert(inp)) |
3028 | #endif /* NECP */ |
3029 | ) { |
3030 | error = (inp == NULL ? EINVAL : EPROTOTYPE); |
3031 | goto bad; |
3032 | } |
3033 | |
3034 | if (kauth_cred_issuser(so->so_cred)) |
3035 | return (rip6_output(m, so, SIN6(nam), control, 0)); |
3036 | |
3037 | /* always copy sockaddr to avoid overwrites */ |
3038 | if (so->so_state & SS_ISCONNECTED) { |
3039 | if (nam != NULL) { |
3040 | error = EISCONN; |
3041 | goto bad; |
3042 | } |
3043 | /* XXX */ |
3044 | bzero(&tmp, sizeof(tmp)); |
3045 | tmp.sin6_family = AF_INET6; |
3046 | tmp.sin6_len = sizeof(struct sockaddr_in6); |
3047 | bcopy(&inp->in6p_faddr, &tmp.sin6_addr, |
3048 | sizeof(struct in6_addr)); |
3049 | dst = &tmp; |
3050 | } else { |
3051 | if (nam == NULL) { |
3052 | error = ENOTCONN; |
3053 | goto bad; |
3054 | } |
3055 | tmp = *(struct sockaddr_in6 *)(void *)nam; |
3056 | dst = &tmp; |
3057 | } |
3058 | |
3059 | /* |
3060 | * For an ICMPv6 packet, we should know its type and code |
3061 | */ |
3062 | if (SOCK_PROTO(so) == IPPROTO_ICMPV6) { |
3063 | if (m->m_len < sizeof(struct icmp6_hdr) && |
3064 | (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { |
3065 | error = ENOBUFS; |
3066 | goto bad; |
3067 | } |
3068 | icmp6 = mtod(m, struct icmp6_hdr *); |
3069 | |
3070 | /* |
3071 | * Allow only to send echo request and node information request |
3072 | * See RFC 2463 for Echo Request Message format |
3073 | */ |
3074 | if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST && |
3075 | icmp6->icmp6_code == 0) || |
3076 | (icmp6->icmp6_type == ICMP6_NI_QUERY && |
3077 | (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 || |
3078 | icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) { |
3079 | /* Good */ |
3080 | ; |
3081 | } else { |
3082 | error = EPERM; |
3083 | goto bad; |
3084 | } |
3085 | } |
3086 | |
3087 | #if ENABLE_DEFAULT_SCOPE |
3088 | if (dst->sin6_scope_id == 0) { /* not change if specified */ |
3089 | dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr); |
3090 | } |
3091 | #endif |
3092 | |
3093 | return (rip6_output(m, so, dst, control, 0)); |
3094 | bad: |
3095 | VERIFY(error != 0); |
3096 | |
3097 | if (m != NULL) |
3098 | m_freem(m); |
3099 | if (control != NULL) |
3100 | m_freem(control); |
3101 | |
3102 | return (error); |
3103 | } |
3104 | |
3105 | /* Like rip6_attach but without root privilege enforcement */ |
3106 | __private_extern__ int |
3107 | icmp6_dgram_attach(struct socket *so, int proto, struct proc *p) |
3108 | { |
3109 | struct inpcb *inp; |
3110 | int error; |
3111 | |
3112 | inp = sotoinpcb(so); |
3113 | if (inp) |
3114 | panic("icmp6_dgram_attach" ); |
3115 | |
3116 | if (proto != IPPROTO_ICMPV6) |
3117 | return EINVAL; |
3118 | |
3119 | error = soreserve(so, rip_sendspace, rip_recvspace); |
3120 | if (error) |
3121 | return error; |
3122 | error = in_pcballoc(so, &ripcbinfo, p); |
3123 | if (error) |
3124 | return error; |
3125 | inp = (struct inpcb *)so->so_pcb; |
3126 | inp->inp_vflag |= INP_IPV6; |
3127 | inp->in6p_ip6_nxt = IPPROTO_ICMPV6; |
3128 | inp->in6p_hops = -1; /* use kernel default */ |
3129 | inp->in6p_cksum = -1; |
3130 | MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *, |
3131 | sizeof(struct icmp6_filter), M_PCB, M_WAITOK); |
3132 | if (inp->in6p_icmp6filt == NULL) |
3133 | return (ENOMEM); |
3134 | ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); |
3135 | return 0; |
3136 | } |
3137 | |
3138 | |
3139 | /* |
3140 | * Perform rate limit check. |
3141 | * Returns 0 if it is okay to send the icmp6 packet. |
3142 | * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate |
3143 | * limitation. |
3144 | * |
3145 | * XXX per-destination check necessary? |
3146 | */ |
3147 | static int |
3148 | icmp6_ratelimit( |
3149 | __unused const struct in6_addr *dst, /* not used at this moment */ |
3150 | const int type, |
3151 | __unused const int code) |
3152 | { |
3153 | int ret; |
3154 | |
3155 | ret = 0; /* okay to send */ |
3156 | |
3157 | /* PPS limit */ |
3158 | if (type == ND_ROUTER_ADVERT) { |
3159 | if (!ppsratecheck(&icmp6rappslim_last, &icmp6rapps_count, |
3160 | icmp6rappslim)) |
3161 | ret++; |
3162 | } else if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, |
3163 | icmp6errppslim)) { |
3164 | /* The packet is subject to rate limit */ |
3165 | ret++; |
3166 | } |
3167 | |
3168 | return ret; |
3169 | } |
3170 | |