1/*
2 * Copyright (c) 2003-2018 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/*
30 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
31 * All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. Neither the name of the project nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 */
57
58#include <sys/param.h>
59#include <sys/systm.h>
60#include <sys/malloc.h>
61#include <sys/socket.h>
62#include <sys/socketvar.h>
63#include <sys/sockio.h>
64#include <sys/kernel.h>
65#include <sys/syslog.h>
66#include <libkern/crypto/sha1.h>
67#include <libkern/OSAtomic.h>
68#include <kern/locks.h>
69
70#include <net/if.h>
71#include <net/if_dl.h>
72#include <net/if_types.h>
73#include <net/route.h>
74#include <net/kpi_protocol.h>
75#include <net/if_llatbl.h>
76
77#include <netinet/in.h>
78#include <netinet/in_var.h>
79#include <netinet/if_ether.h>
80#include <netinet/in_pcb.h>
81#include <netinet/icmp6.h>
82
83#include <netinet/ip6.h>
84#include <netinet6/ip6_var.h>
85#include <netinet6/in6_var.h>
86#include <netinet6/in6_pcb.h>
87#include <netinet6/in6_ifattach.h>
88#include <netinet6/ip6_var.h>
89#include <netinet6/nd6.h>
90#include <netinet6/scope6_var.h>
91
92#include <net/net_osdep.h>
93#include <dev/random/randomdev.h>
94
95u_int32_t in6_maxmtu = 0;
96extern lck_mtx_t *nd6_mutex;
97
98#if IP6_AUTO_LINKLOCAL
99int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
100#else
101int ip6_auto_linklocal = 1; /* enable by default */
102#endif
103
104extern struct inpcbinfo udbinfo;
105extern struct inpcbinfo ripcbinfo;
106
107static const unsigned int in6_extra_size = sizeof(struct in6_ifextra);
108static const unsigned int in6_extra_bufsize = in6_extra_size +
109 sizeof(void *) + sizeof(uint64_t);
110
111static int get_rand_iid(struct ifnet *, struct in6_addr *);
112static int in6_generate_tmp_iid(u_int8_t *, const u_int8_t *, u_int8_t *);
113static int in6_select_iid_from_all_hw(struct ifnet *, struct ifnet *,
114 struct in6_addr *);
115static int in6_ifattach_linklocal(struct ifnet *, struct in6_aliasreq *);
116static int in6_ifattach_loopback(struct ifnet *);
117
118/*
119 * Generate a last-resort interface identifier, when the machine has no
120 * IEEE802/EUI64 address sources.
121 * The goal here is to get an interface identifier that is
122 * (1) random enough and (2) does not change across reboot.
123 * We currently use SHA1(hostname) for it.
124 *
125 * in6 - upper 64bits are preserved
126 */
127static int
128get_rand_iid(
129 __unused struct ifnet *ifp,
130 struct in6_addr *in6) /* upper 64bits are preserved */
131{
132 SHA1_CTX ctxt;
133 u_int8_t digest[SHA1_RESULTLEN];
134 int hostnlen = strlen(hostname);
135
136 /* generate 8 bytes of pseudo-random value. */
137 bzero(&ctxt, sizeof (ctxt));
138 SHA1Init(&ctxt);
139 SHA1Update(&ctxt, hostname, hostnlen);
140 SHA1Final(digest, &ctxt);
141
142 /* assumes sizeof (digest) > sizeof (iid) */
143 bcopy(digest, &in6->s6_addr[8], 8);
144
145 /* make sure to set "u" bit to local, and "g" bit to individual. */
146 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */
147 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */
148
149 /* convert EUI64 into IPv6 interface identifier */
150 ND6_EUI64_TO_IFID(in6);
151
152 return (0);
153}
154
155static int
156in6_generate_tmp_iid(
157 u_int8_t *seed0,
158 const u_int8_t *seed1,
159 u_int8_t *ret)
160{
161 SHA1_CTX ctxt;
162 u_int8_t seed[16], nullbuf[8], digest[SHA1_RESULTLEN];
163 u_int32_t val32;
164 struct timeval tv;
165
166 /* If there's no history, start with a random seed. */
167 bzero(nullbuf, sizeof (nullbuf));
168 if (bcmp(nullbuf, seed0, sizeof (nullbuf)) == 0) {
169 int i;
170
171 for (i = 0; i < 2; i++) {
172 getmicrotime(&tv);
173 val32 = RandomULong() ^ tv.tv_usec;
174 bcopy(&val32, seed + sizeof (val32) * i,
175 sizeof (val32));
176 }
177 } else {
178 bcopy(seed0, seed, 8);
179 }
180
181 /* copy the right-most 64-bits of the given address */
182 /* XXX assumption on the size of IFID */
183 bcopy(seed1, &seed[8], 8);
184
185 if ((0)) { /* for debugging purposes only */
186 int i;
187
188 printf("%s: new randomized ID from: ", __func__);
189 for (i = 0; i < 16; i++)
190 printf("%02x", seed[i]);
191 printf(" ");
192 }
193
194 /* generate 16 bytes of pseudo-random value. */
195 bzero(&ctxt, sizeof (ctxt));
196 SHA1Init(&ctxt);
197 SHA1Update(&ctxt, seed, sizeof (seed));
198 SHA1Final(digest, &ctxt);
199
200 /*
201 * RFC 4941 3.2.1. (3)
202 * Take the left-most 64-bits of the SHA1 digest and set bit 6 (the
203 * left-most bit is numbered 0) to zero.
204 */
205 bcopy(digest, ret, 8);
206 ret[0] &= ~ND6_EUI64_UBIT;
207
208 /*
209 * XXX: we'd like to ensure that the generated value is not zero
210 * for simplicity. If the caclculated digest happens to be zero,
211 * use a random non-zero value as the last resort.
212 */
213 if (bcmp(nullbuf, ret, sizeof (nullbuf)) == 0) {
214 nd6log((LOG_INFO,
215 "%s: computed SHA1 value is zero.\n", __func__));
216
217 getmicrotime(&tv);
218 val32 = random() ^ tv.tv_usec;
219 val32 = 1 + (val32 % (0xffffffff - 1));
220 }
221
222 /*
223 * RFC 4941 3.2.1. (4)
224 * Take the next 64-bits of the SHA1 digest and save them in
225 * stable storage as the history value to be used in the next
226 * iteration of the algorithm.
227 */
228 bcopy(&digest[8], seed0, 8);
229
230 if ((0)) { /* for debugging purposes only */
231 int i;
232
233 printf("to: ");
234 for (i = 0; i < 16; i++)
235 printf("%02x", digest[i]);
236 printf("\n");
237 }
238
239 return (0);
240}
241
242/*
243 * Get interface identifier for the specified interface using the method in
244 * Appendix A of RFC 4291.
245 *
246 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
247 *
248 * in6 - upper 64bits are preserved
249 */
250int
251in6_iid_from_hw(struct ifnet *ifp, struct in6_addr *in6)
252{
253 struct ifaddr *ifa = NULL;
254 struct sockaddr_dl *sdl;
255 u_int8_t *addr;
256 size_t addrlen;
257 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
258 static u_int8_t allone[8] =
259 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
260 int err = -1;
261
262 /* Why doesn't this code use ifnet_addrs? */
263 ifnet_lock_shared(ifp);
264 ifa = ifp->if_lladdr;
265 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
266 if (sdl->sdl_alen == 0) {
267 ifnet_lock_done(ifp);
268 return (-1);
269 }
270 IFA_ADDREF(ifa); /* for this routine */
271 ifnet_lock_done(ifp);
272
273 IFA_LOCK(ifa);
274 addr = (u_int8_t *) LLADDR(sdl);
275 addrlen = sdl->sdl_alen;
276
277 /* get EUI64 */
278 switch (ifp->if_type) {
279 case IFT_ETHER:
280 case IFT_FDDI:
281 case IFT_ISO88025:
282 case IFT_ATM:
283 case IFT_IEEE1394:
284 case IFT_L2VLAN:
285 case IFT_IEEE8023ADLAG:
286#if IFT_IEEE80211
287 case IFT_IEEE80211:
288#endif
289 case IFT_BRIDGE:
290 /* IEEE802/EUI64 cases - what others? */
291 /* IEEE1394 uses 16byte length address starting with EUI64 */
292 if (addrlen > 8)
293 addrlen = 8;
294
295 /* look at IEEE802/EUI64 only */
296 if (addrlen != 8 && addrlen != 6)
297 goto done;
298
299 /*
300 * check for invalid MAC address - on bsdi, we see it a lot
301 * since wildboar configures all-zero MAC on pccard before
302 * card insertion.
303 */
304 if (bcmp(addr, allzero, addrlen) == 0)
305 goto done;
306 if (bcmp(addr, allone, addrlen) == 0)
307 goto done;
308
309 /* make EUI64 address */
310 if (addrlen == 8)
311 bcopy(addr, &in6->s6_addr[8], 8);
312 else if (addrlen == 6) {
313 in6->s6_addr[8] = addr[0];
314 in6->s6_addr[9] = addr[1];
315 in6->s6_addr[10] = addr[2];
316 in6->s6_addr[11] = 0xff;
317 in6->s6_addr[12] = 0xfe;
318 in6->s6_addr[13] = addr[3];
319 in6->s6_addr[14] = addr[4];
320 in6->s6_addr[15] = addr[5];
321 }
322 break;
323
324 case IFT_ARCNET:
325 if (addrlen != 1)
326 goto done;
327 if (!addr[0])
328 goto done;
329
330 bzero(&in6->s6_addr[8], 8);
331 in6->s6_addr[15] = addr[0];
332
333 /*
334 * due to insufficient bitwidth, we mark it local.
335 */
336 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */
337 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */
338 break;
339
340 case IFT_GIF:
341#if IFT_STF
342 case IFT_STF:
343#endif
344 /*
345 * RFC2893 says: "SHOULD use IPv4 address as IID source".
346 * however, IPv4 address is not very suitable as unique
347 * identifier source (can be renumbered).
348 * we don't do this.
349 */
350 goto done;
351
352 case IFT_CELLULAR:
353 goto done;
354
355 default:
356 goto done;
357 }
358
359 /* sanity check: g bit must not indicate "group" */
360 if (ND6_EUI64_GROUP(in6))
361 goto done;
362
363 /* convert EUI64 into IPv6 interface identifier */
364 ND6_EUI64_TO_IFID(in6);
365
366 /*
367 * sanity check: iid must not be all zero, avoid conflict with
368 * subnet router anycast
369 */
370 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 &&
371 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
372 goto done;
373 }
374
375 err = 0; /* found */
376
377done:
378 /* This must not be the last reference to the lladdr */
379 if (IFA_REMREF_LOCKED(ifa) == NULL) {
380 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa);
381 /* NOTREACHED */
382 }
383 IFA_UNLOCK(ifa);
384 return (err);
385}
386
387/*
388 * Get interface identifier for the specified interface using the method in
389 * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface
390 * identifier from other information sources.
391 *
392 * ifp - primary EUI64 source
393 * altifp - secondary EUI64 source
394 * in6 - IPv6 address to output IID
395 */
396static int
397in6_select_iid_from_all_hw(
398 struct ifnet *ifp0,
399 struct ifnet *altifp, /* secondary EUI64 source */
400 struct in6_addr *in6)
401{
402 struct ifnet *ifp;
403
404 /* first, try to get it from the interface itself */
405 if (in6_iid_from_hw(ifp0, in6) == 0) {
406 nd6log((LOG_DEBUG, "%s: IID derived from HW interface.\n",
407 if_name(ifp0)));
408 goto success;
409 }
410
411 /* try secondary EUI64 source. this basically is for ATM PVC */
412 if (altifp && in6_iid_from_hw(altifp, in6) == 0) {
413 nd6log((LOG_DEBUG, "%s: IID from alterate HW interface %s.\n",
414 if_name(ifp0), if_name(altifp)));
415 goto success;
416 }
417
418 /* next, try to get it from some other hardware interface */
419 ifnet_head_lock_shared();
420 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
421 if (ifp == ifp0)
422 continue;
423 if (in6_iid_from_hw(ifp, in6) != 0)
424 continue;
425
426 /*
427 * to borrow IID from other interface, IID needs to be
428 * globally unique
429 */
430 if (ND6_IFID_UNIVERSAL(in6)) {
431 nd6log((LOG_DEBUG, "%s: borrowed IID from %s\n",
432 if_name(ifp0), if_name(ifp)));
433 ifnet_head_done();
434 goto success;
435 }
436 }
437 ifnet_head_done();
438
439 /* last resort: get from random number source */
440 if (get_rand_iid(ifp, in6) == 0) {
441 nd6log((LOG_DEBUG, "%s: IID from PRNG.\n", if_name(ifp0)));
442 goto success;
443 }
444
445 printf("%s: failed to get interface identifier\n", if_name(ifp0));
446 return (-1);
447
448success:
449 nd6log((LOG_INFO, "%s: IID: "
450 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
451 if_name(ifp0),
452 in6->s6_addr[8], in6->s6_addr[9],
453 in6->s6_addr[10], in6->s6_addr[11],
454 in6->s6_addr[12], in6->s6_addr[13],
455 in6->s6_addr[14], in6->s6_addr[15]));
456 return (0);
457}
458
459static int
460in6_ifattach_linklocal(struct ifnet *ifp, struct in6_aliasreq *ifra)
461{
462 struct in6_ifaddr *ia;
463 struct nd_prefix pr0, *pr;
464 int i, error;
465
466 VERIFY(ifra != NULL);
467
468 proto_plumb(PF_INET6, ifp);
469
470 error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia);
471 if (error != 0) {
472 /*
473 * XXX: When the interface does not support IPv6, this call
474 * would fail in the SIOCSIFADDR ioctl. I believe the
475 * notification is rather confusing in this case, so just
476 * suppress it. (jinmei@kame.net 20010130)
477 */
478 if (error != EAFNOSUPPORT)
479 nd6log((LOG_NOTICE, "%s: failed to "
480 "configure a link-local address on %s "
481 "(errno=%d)\n",
482 __func__, if_name(ifp), error));
483 return (EADDRNOTAVAIL);
484 }
485 VERIFY(ia != NULL);
486
487 /*
488 * Make the link-local prefix (fe80::%link/64) as on-link.
489 * Since we'd like to manage prefixes separately from addresses,
490 * we make an ND6 prefix structure for the link-local prefix,
491 * and add it to the prefix list as a never-expire prefix.
492 * XXX: this change might affect some existing code base...
493 */
494 bzero(&pr0, sizeof (pr0));
495 lck_mtx_init(&pr0.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr);
496 pr0.ndpr_ifp = ifp;
497 /* this should be 64 at this moment. */
498 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL);
499 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
500 pr0.ndpr_prefix = ifra->ifra_addr;
501 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
502 for (i = 0; i < 4; i++) {
503 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
504 in6mask64.s6_addr32[i];
505 }
506 /*
507 * Initialize parameters. The link-local prefix must always be
508 * on-link, and its lifetimes never expire.
509 */
510 pr0.ndpr_raf_onlink = 1;
511 pr0.ndpr_raf_auto = 1; /* probably meaningless */
512 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
513 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
514 pr0.ndpr_stateflags |= NDPRF_STATIC;
515 /*
516 * Since there is no other link-local addresses, nd6_prefix_lookup()
517 * probably returns NULL. However, we cannot always expect the result.
518 * For example, if we first remove the (only) existing link-local
519 * address, and then reconfigure another one, the prefix is still
520 * valid with referring to the old link-local address.
521 */
522 if ((pr = nd6_prefix_lookup(&pr0, ND6_PREFIX_EXPIRY_UNSPEC)) == NULL) {
523 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) {
524 IFA_REMREF(&ia->ia_ifa);
525 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp);
526 return (error);
527 }
528 }
529
530 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL);
531 IFA_REMREF(&ia->ia_ifa);
532
533 /* Drop use count held above during lookup/add */
534 if (pr != NULL)
535 NDPR_REMREF(pr);
536
537 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp);
538 return (0);
539}
540
541static int
542in6_ifattach_loopback(
543 struct ifnet *ifp) /* must be IFT_LOOP */
544{
545 struct in6_aliasreq ifra;
546 struct in6_ifaddr *ia;
547 int error;
548
549 bzero(&ifra, sizeof (ifra));
550
551 /*
552 * in6_update_ifa() does not use ifra_name, but we accurately set it
553 * for safety.
554 */
555 strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name));
556
557 ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6);
558 ifra.ifra_prefixmask.sin6_family = AF_INET6;
559 ifra.ifra_prefixmask.sin6_addr = in6mask128;
560
561 /*
562 * Always initialize ia_dstaddr (= broadcast address) to loopback
563 * address. Follows IPv4 practice - see in_ifinit().
564 */
565 ifra.ifra_dstaddr.sin6_len = sizeof (struct sockaddr_in6);
566 ifra.ifra_dstaddr.sin6_family = AF_INET6;
567 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
568
569 ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6);
570 ifra.ifra_addr.sin6_family = AF_INET6;
571 ifra.ifra_addr.sin6_addr = in6addr_loopback;
572
573 /* the loopback address should NEVER expire. */
574 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
575 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
576
577 /* we don't need to perform DAD on loopback interfaces. */
578 ifra.ifra_flags |= IN6_IFF_NODAD;
579
580 /* add the new interface address */
581 error = in6_update_ifa(ifp, &ifra, 0, &ia);
582 if (error != 0) {
583 nd6log((LOG_ERR,
584 "%s: failed to configure loopback address %s (error=%d)\n",
585 __func__, if_name(ifp), error));
586 VERIFY(ia == NULL);
587 return (EADDRNOTAVAIL);
588 }
589
590 VERIFY(ia != NULL);
591 IFA_REMREF(&ia->ia_ifa);
592 return (0);
593}
594
595/*
596 * compute NI group address, based on the current hostname setting.
597 * see RFC 4620.
598 *
599 * when ifp == NULL, the caller is responsible for filling scopeid.
600 */
601int
602in6_nigroup(
603 struct ifnet *ifp,
604 const char *name,
605 int namelen,
606 struct in6_addr *in6)
607{
608 const char *p;
609 u_char *q;
610 SHA1_CTX ctxt;
611 u_int8_t digest[SHA1_RESULTLEN];
612 char l;
613 char n[64]; /* a single label must not exceed 63 chars */
614
615 if (!namelen || !name)
616 return (-1);
617
618 p = name;
619 while (p && *p && *p != '.' && p - name < namelen)
620 p++;
621 if (p - name > sizeof (n) - 1)
622 return (-1); /* label too long */
623 l = p - name;
624 strlcpy(n, name, l);
625 n[(int)l] = '\0';
626 for (q = (u_char *) n; *q; q++) {
627 if ('A' <= *q && *q <= 'Z')
628 *q = *q - 'A' + 'a';
629 }
630
631 /* generate 16 bytes of pseudo-random value. */
632 bzero(&ctxt, sizeof (ctxt));
633 SHA1Init(&ctxt);
634 SHA1Update(&ctxt, &l, sizeof (l));
635 SHA1Update(&ctxt, n, l);
636 SHA1Final(digest, &ctxt);
637
638 bzero(in6, sizeof (*in6));
639 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
640 in6->s6_addr8[11] = 2;
641 in6->s6_addr8[12] = 0xff;
642 /* copy first 3 bytes of prefix into address */
643 bcopy(digest, &in6->s6_addr8[13], 3);
644 if (in6_setscope(in6, ifp, NULL))
645 return (-1); /* XXX: should not fail */
646
647 return (0);
648}
649
650int
651in6_domifattach(struct ifnet *ifp)
652{
653 int error;
654
655 VERIFY(ifp != NULL);
656
657 error = proto_plumb(PF_INET6, ifp);
658 if (error != 0) {
659 if (error != EEXIST)
660 log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n",
661 __func__, error, if_name(ifp));
662 } else {
663 error = in6_ifattach_prelim(ifp);
664 if (error != 0) {
665 int errorx;
666
667 log(LOG_ERR,
668 "%s: in6_ifattach_prelim returned %d if=%s%d\n",
669 __func__, error, ifp->if_name, ifp->if_unit);
670
671 errorx = proto_unplumb(PF_INET6, ifp);
672 if (errorx != 0) /* XXX should not fail */
673 log(LOG_ERR,
674 "%s: proto_unplumb returned %d if=%s%d\n",
675 __func__, errorx, ifp->if_name,
676 ifp->if_unit);
677 }
678 }
679
680 return (error);
681}
682
683int
684in6_ifattach_prelim(struct ifnet *ifp)
685{
686 struct in6_ifextra *ext;
687 void **pbuf, *base;
688 int error = 0;
689 struct in6_ifaddr *ia6 = NULL;
690
691 VERIFY(ifp != NULL);
692
693 /* quirks based on interface type */
694 switch (ifp->if_type) {
695#if IFT_STF
696 case IFT_STF:
697 /*
698 * 6to4 interface is a very special kind of beast.
699 * no multicast, no linklocal. RFC2529 specifies how to make
700 * linklocals for 6to4 interface, but there's no use and
701 * it is rather harmful to have one.
702 */
703 goto skipmcast;
704#endif
705 default:
706 break;
707 }
708
709 /*
710 * IPv6 requires multicast capability at the interface.
711 * (previously, this was a silent error.)
712 */
713 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
714 nd6log0((LOG_INFO, "in6_ifattach: ",
715 "%s is not multicast capable, IPv6 not enabled\n",
716 if_name(ifp)));
717 return (EINVAL);
718 }
719
720#if IFT_STF
721skipmcast:
722#endif
723
724 if (ifp->if_inet6data == NULL) {
725 ext = (struct in6_ifextra *)_MALLOC(in6_extra_bufsize, M_IFADDR,
726 M_WAITOK|M_ZERO);
727 if (!ext)
728 return (ENOMEM);
729 base = (void *)P2ROUNDUP((intptr_t)ext + sizeof(uint64_t),
730 sizeof(uint64_t));
731 VERIFY(((intptr_t)base + in6_extra_size) <=
732 ((intptr_t)ext + in6_extra_bufsize));
733 pbuf = (void **)((intptr_t)base - sizeof(void *));
734 *pbuf = ext;
735 ifp->if_inet6data = base;
736 IN6_IFEXTRA(ifp)->ii_llt = in6_lltattach(ifp);
737 VERIFY(IS_P2ALIGNED(ifp->if_inet6data, sizeof(uint64_t)));
738 } else {
739 /*
740 * Since the structure is never freed, we need to zero out
741 * some of its members. We avoid zeroing out the scope6
742 * structure on purpose because other threads might be
743 * using its contents.
744 */
745 bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat,
746 sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat));
747 bzero(&IN6_IFEXTRA(ifp)->in6_ifstat,
748 sizeof(IN6_IFEXTRA(ifp)->in6_ifstat));
749 /* XXX TBD Purge the layer two table */
750 /*
751 * XXX When recycling, nd_ifinfo gets initialized, other
752 * than the lock, inside nd6_ifattach
753 */
754 }
755
756 /*
757 * XXX Only initialize IPv6 configuration for the interface
758 * if interface has not yet been configured with
759 * link local IPv6 address.
760 * Could possibly be optimized with an interface flag if need
761 * be. For now using in6ifa_ifpforlinklocal.
762 */
763 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
764 if (ia6 == NULL) {
765 IN6_IFEXTRA(ifp)->netsig_len = 0;
766 bzero(&IN6_IFEXTRA(ifp)->netsig,
767 sizeof(IN6_IFEXTRA(ifp)->netsig));
768 bzero(IN6_IFEXTRA(ifp)->nat64_prefixes,
769 sizeof(IN6_IFEXTRA(ifp)->nat64_prefixes));
770 /* initialize NDP variables */
771 nd6_ifattach(ifp);
772 } else {
773 VERIFY(ND_IFINFO(ifp)->initialized);
774 IFA_REMREF(&ia6->ia_ifa);
775 ia6 = NULL;
776 }
777 scope6_ifattach(ifp);
778
779 /* initialize loopback interface address */
780 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
781 error = in6_ifattach_loopback(ifp);
782 if (error != 0) {
783 log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n",
784 __func__, error, ifp->if_name,
785 ifp->if_unit);
786 return (error);
787 }
788 }
789
790 /* update dynamically. */
791 if (in6_maxmtu < ifp->if_mtu)
792 in6_maxmtu = ifp->if_mtu;
793
794 VERIFY(error == 0);
795 return (0);
796}
797
798/*
799 * This routine is only meant to configure IPv6 Link Local
800 * addresses.
801 */
802int
803in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp,
804 struct in6_aliasreq *ifra0)
805{
806 int error;
807 struct in6_ifaddr *ia6;
808 struct in6_aliasreq ifra;
809
810 error = in6_ifattach_prelim(ifp);
811 if (error != 0)
812 return (error);
813
814 if (!ip6_auto_linklocal)
815 return (0);
816
817 /*
818 * Assign a link-local address, only if there isn't one here already.
819 * XXX If we ever allow more than one LLA on the interface
820 * make sure that the corresponding prefix on the prefixlist
821 * is reference counted and the address's prefix pointer
822 * points to the prefix.
823 */
824 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
825 if (ia6 != NULL) {
826 IFA_REMREF(&ia6->ia_ifa);
827 return (0);
828 }
829
830 bzero(&ifra, sizeof (ifra));
831
832 /*
833 * in6_update_ifa() does not use ifra_name, but we accurately set it
834 * for safety.
835 */
836 strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name));
837
838 /* Initialize the IPv6 interface address in our in6_aliasreq block */
839 if (ifra0 != NULL) {
840 /* interface provided both addresses for us */
841 struct sockaddr_in6 *sin6 = &ifra.ifra_addr;
842 struct in6_addr *in6 = &sin6->sin6_addr;
843 boolean_t ok = TRUE;
844
845 bcopy(&ifra0->ifra_addr, sin6, sizeof (struct sockaddr_in6));
846
847 if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0)
848 ok = FALSE;
849 if (ok && (in6->s6_addr16[0] != htons(0xfe80)))
850 ok = FALSE;
851 if (ok) {
852 if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0)
853 in6->s6_addr16[1] = htons(ifp->if_index);
854 else if (sin6->sin6_scope_id != 0 &&
855 sin6->sin6_scope_id != ifp->if_index)
856 ok = FALSE;
857 else if (in6->s6_addr16[1] != 0 &&
858 ntohs(in6->s6_addr16[1]) != ifp->if_index)
859 ok = FALSE;
860 }
861 if (ok && (in6->s6_addr32[1] != 0))
862 ok = FALSE;
863 if (!ok)
864 return (EINVAL);
865 } else {
866 ifra.ifra_addr.sin6_family = AF_INET6;
867 ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6);
868 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
869 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
870 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
871 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
872 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
873 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
874 } else {
875 if (in6_select_iid_from_all_hw(ifp, altifp,
876 &ifra.ifra_addr.sin6_addr) != 0) {
877 nd6log((LOG_ERR, "%s: no IID available\n",
878 if_name(ifp)));
879 return (EADDRNOTAVAIL);
880 }
881 }
882 }
883
884 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
885 return (EADDRNOTAVAIL);
886
887 /* Set the prefix mask */
888 ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6);
889 ifra.ifra_prefixmask.sin6_family = AF_INET6;
890 ifra.ifra_prefixmask.sin6_addr = in6mask64;
891
892 /* link-local addresses should NEVER expire. */
893 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
894 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
895
896 /* Attach the link-local address */
897 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
898 nd6log((LOG_INFO,
899 "%s: %s could not attach link-local address.\n",
900 __func__, if_name(ifp)));
901 /* NB: not an error */
902 }
903
904 return (0);
905}
906
907int
908in6_ifattach_llcgareq(struct ifnet *ifp, struct in6_cgareq *llcgasr)
909{
910 struct in6_aliasreq ifra;
911 struct in6_ifaddr *ia6 = NULL;
912 struct nd_ifinfo *ndi = NULL;
913 int error;
914
915 VERIFY(llcgasr != NULL);
916
917 error = in6_ifattach_prelim(ifp);
918 if (error != 0)
919 return (error);
920
921 if (!ip6_auto_linklocal)
922 return (0);
923
924 if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED)
925 return (ENXIO);
926
927 ndi = ND_IFINFO(ifp);
928 VERIFY(ndi != NULL && ndi->initialized);
929 if ((ndi->flags & ND6_IFF_INSECURE) != 0) {
930 return (ENXIO);
931 }
932
933 /*
934 * Assign a link-local address, only if there isn't one here already.
935 * XXX If we ever allow more than one LLA on the interface
936 * make sure that the corresponding prefix on the prefixlist
937 * is reference counted and the address's prefix pointer
938 * points to the prefix.
939 */
940 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
941 if (ia6 != NULL) {
942 IFA_REMREF(&ia6->ia_ifa);
943 return (0);
944 }
945
946 bzero(&ifra, sizeof (ifra));
947 strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name));
948
949 ifra.ifra_addr.sin6_family = AF_INET6;
950 ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6);
951 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
952 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
953 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
954 ifra.ifra_flags = IN6_IFF_SECURED;
955
956 in6_cga_node_lock();
957 if (in6_cga_generate(&llcgasr->cgar_cgaprep, 0,
958 &ifra.ifra_addr.sin6_addr)) {
959 in6_cga_node_unlock();
960 return (EADDRNOTAVAIL);
961 }
962 in6_cga_node_unlock();
963
964 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
965 return (EADDRNOTAVAIL);
966
967 /* Set the prefix mask */
968 ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6);
969 ifra.ifra_prefixmask.sin6_family = AF_INET6;
970 ifra.ifra_prefixmask.sin6_addr = in6mask64;
971
972 /*
973 * link-local addresses should NEVER expire, but cryptographic
974 * ones may have finite preferred lifetime [if it's important to
975 * keep them from being used by applications as persistent device
976 * identifiers].
977 */
978 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
979 ifra.ifra_lifetime.ia6t_pltime = llcgasr->cgar_lifetime.ia6t_pltime;
980
981 /* Attach the link-local address */
982 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
983 /* NB: not an error */
984 nd6log((LOG_INFO,
985 "%s: %s could not attach link-local address.\n",
986 __func__, if_name(ifp)));
987 }
988
989 VERIFY(error == 0);
990 return (error);
991}
992
993/*
994 * NOTE: in6_ifdetach() does not support loopback if at this moment.
995 */
996void
997in6_ifdetach(struct ifnet *ifp)
998{
999 struct in6_ifaddr *ia, *oia;
1000 struct ifaddr *ifa;
1001 struct rtentry *rt;
1002 struct sockaddr_in6 sin6;
1003 struct in6_multi_mship *imm;
1004 int unlinked;
1005
1006 LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED);
1007
1008 /* remove neighbor management table */
1009 nd6_purge(ifp);
1010
1011 if (LLTABLE6(ifp))
1012 lltable_free(LLTABLE6(ifp));
1013
1014 /* nuke any of IPv6 addresses we have */
1015 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1016 ia = in6_ifaddrs;
1017 while (ia != NULL) {
1018 if (ia->ia_ifa.ifa_ifp != ifp) {
1019 ia = ia->ia_next;
1020 continue;
1021 }
1022 IFA_ADDREF(&ia->ia_ifa); /* for us */
1023 lck_rw_done(&in6_ifaddr_rwlock);
1024 in6_purgeaddr(&ia->ia_ifa);
1025 IFA_REMREF(&ia->ia_ifa); /* for us */
1026 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1027 /*
1028 * Purging the address caused in6_ifaddr_rwlock
1029 * to be dropped and reacquired;
1030 * therefore search again from the beginning
1031 * of in6_ifaddrs list.
1032 */
1033 ia = in6_ifaddrs;
1034 }
1035 lck_rw_done(&in6_ifaddr_rwlock);
1036
1037 ifnet_lock_exclusive(ifp);
1038
1039 /* undo everything done by in6_ifattach(), just in case */
1040 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1041 while (ifa != NULL) {
1042 IFA_LOCK(ifa);
1043 if (ifa->ifa_addr->sa_family != AF_INET6 ||
1044 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->
1045 sin6_addr)) {
1046 IFA_UNLOCK(ifa);
1047 ifa = TAILQ_NEXT(ifa, ifa_list);
1048 continue;
1049 }
1050
1051 ia = (struct in6_ifaddr *)ifa;
1052
1053 /* hold a reference for this routine */
1054 IFA_ADDREF_LOCKED(ifa);
1055 /* remove from the linked list */
1056 if_detach_ifa(ifp, ifa);
1057 IFA_UNLOCK(ifa);
1058
1059 /*
1060 * Leaving the multicast group(s) may involve freeing the
1061 * link address multicast structure(s) for the interface,
1062 * which is protected by ifnet lock. To avoid violating
1063 * lock ordering, we must drop ifnet lock before doing so.
1064 * The ifa won't go away since we held a refcnt above.
1065 */
1066 ifnet_lock_done(ifp);
1067
1068 /*
1069 * We have to do this work manually here instead of calling
1070 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag.
1071 */
1072
1073 /*
1074 * leave from multicast groups we have joined for the interface
1075 */
1076 IFA_LOCK(ifa);
1077 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1078 LIST_REMOVE(imm, i6mm_chain);
1079 IFA_UNLOCK(ifa);
1080 in6_leavegroup(imm);
1081 IFA_LOCK(ifa);
1082 }
1083
1084 /* remove from the routing table */
1085 if (ia->ia_flags & IFA_ROUTE) {
1086 IFA_UNLOCK(ifa);
1087 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0);
1088 if (rt != NULL) {
1089 (void) rtrequest(RTM_DELETE,
1090 (struct sockaddr *)&ia->ia_addr,
1091 (struct sockaddr *)&ia->ia_addr,
1092 (struct sockaddr *)&ia->ia_prefixmask,
1093 rt->rt_flags, (struct rtentry **)0);
1094 rtfree(rt);
1095 }
1096 } else {
1097 IFA_UNLOCK(ifa);
1098 }
1099
1100 /* also remove from the IPv6 address chain(itojun&jinmei) */
1101 unlinked = 1;
1102 oia = ia;
1103 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1104 if (oia == (ia = in6_ifaddrs)) {
1105 in6_ifaddrs = ia->ia_next;
1106 } else {
1107 while (ia->ia_next && (ia->ia_next != oia))
1108 ia = ia->ia_next;
1109 if (ia->ia_next) {
1110 ia->ia_next = oia->ia_next;
1111 } else {
1112 nd6log((LOG_ERR,
1113 "%s: didn't unlink in6ifaddr from "
1114 "list\n", if_name(ifp)));
1115 unlinked = 0;
1116 }
1117 }
1118 lck_rw_done(&in6_ifaddr_rwlock);
1119
1120 ifa = &oia->ia_ifa;
1121 /*
1122 * release another refcnt for the link from in6_ifaddrs.
1123 * Do this only if it's not already unlinked in the event
1124 * that we lost the race, since in6_ifaddr_rwlock was
1125 * momentarily dropped above.
1126 */
1127 if (unlinked)
1128 IFA_REMREF(ifa);
1129 /* release reference held for this routine */
1130 IFA_REMREF(ifa);
1131
1132 /*
1133 * This is suboptimal, but since we dropped ifnet lock above
1134 * the list might have changed. Repeat the search from the
1135 * beginning until we find the first eligible IPv6 address.
1136 */
1137 ifnet_lock_exclusive(ifp);
1138 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1139 }
1140 ifnet_lock_done(ifp);
1141
1142 /* invalidate route caches */
1143 routegenid_inet6_update();
1144
1145 /*
1146 * remove neighbor management table. we call it twice just to make
1147 * sure we nuke everything. maybe we need just one call.
1148 * XXX: since the first call did not release addresses, some prefixes
1149 * might remain. We should call nd6_purge() again to release the
1150 * prefixes after removing all addresses above.
1151 * (Or can we just delay calling nd6_purge until at this point?)
1152 */
1153 nd6_purge(ifp);
1154
1155 /* remove route to link-local allnodes multicast (ff02::1) */
1156 bzero(&sin6, sizeof (sin6));
1157 sin6.sin6_len = sizeof (struct sockaddr_in6);
1158 sin6.sin6_family = AF_INET6;
1159 sin6.sin6_addr = in6addr_linklocal_allnodes;
1160 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1161 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
1162 if (rt != NULL) {
1163 RT_LOCK(rt);
1164 if (rt->rt_ifp == ifp) {
1165 /*
1166 * Prevent another thread from modifying rt_key,
1167 * rt_gateway via rt_setgate() after the rt_lock
1168 * is dropped by marking the route as defunct.
1169 */
1170 rt->rt_flags |= RTF_CONDEMNED;
1171 RT_UNLOCK(rt);
1172 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1173 rt_mask(rt), rt->rt_flags, 0);
1174 } else {
1175 RT_UNLOCK(rt);
1176 }
1177 rtfree(rt);
1178 }
1179}
1180
1181void
1182in6_iid_mktmp(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
1183 int generate)
1184{
1185 u_int8_t nullbuf[8];
1186 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
1187
1188 VERIFY(ndi != NULL && ndi->initialized);
1189 lck_mtx_lock(&ndi->lock);
1190 bzero(nullbuf, sizeof (nullbuf));
1191 if (bcmp(ndi->randomid, nullbuf, sizeof (nullbuf)) == 0) {
1192 /* we've never created a random ID. Create a new one. */
1193 generate = 1;
1194 }
1195
1196 if (generate) {
1197 bcopy(baseid, ndi->randomseed1, sizeof (ndi->randomseed1));
1198
1199 /* in6_generate_tmp_iid will update seedn and buf */
1200 (void) in6_generate_tmp_iid(ndi->randomseed0, ndi->randomseed1,
1201 ndi->randomid);
1202 }
1203
1204 bcopy(ndi->randomid, retbuf, 8);
1205 lck_mtx_unlock(&ndi->lock);
1206}
1207
1208void
1209in6_tmpaddrtimer(void *arg)
1210{
1211#pragma unused(arg)
1212 struct ifnet *ifp = NULL;
1213 struct nd_ifinfo *ndi = NULL;
1214 u_int8_t nullbuf[8];
1215
1216 timeout(in6_tmpaddrtimer, (caddr_t)0, (ip6_temp_preferred_lifetime -
1217 ip6_desync_factor - ip6_temp_regen_advance) * hz);
1218
1219 bzero(nullbuf, sizeof (nullbuf));
1220 ifnet_head_lock_shared();
1221 for (ifp = ifnet_head.tqh_first; ifp;
1222 ifp = ifp->if_link.tqe_next) {
1223 ndi = ND_IFINFO(ifp);
1224 if ((NULL == ndi) || (FALSE == ndi->initialized)) {
1225 continue;
1226 }
1227 lck_mtx_lock(&ndi->lock);
1228 if (bcmp(ndi->randomid, nullbuf, sizeof (nullbuf)) != 0) {
1229 /*
1230 * We've been generating a random ID on this interface.
1231 * Create a new one.
1232 */
1233 (void) in6_generate_tmp_iid(ndi->randomseed0,
1234 ndi->randomseed1, ndi->randomid);
1235 }
1236 lck_mtx_unlock(&ndi->lock);
1237 }
1238 ifnet_head_done();
1239}
1240