1 /*
2 * Copyright (c) 2003-2021 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/sha2.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
76 #include <netinet/in.h>
77 #include <netinet/in_var.h>
78 #include <netinet/if_ether.h>
79 #include <netinet/in_pcb.h>
80 #include <netinet/icmp6.h>
81
82 #include <netinet/ip6.h>
83 #include <netinet6/ip6_var.h>
84 #include <netinet6/in6_var.h>
85 #include <netinet6/in6_pcb.h>
86 #include <netinet6/in6_ifattach.h>
87 #include <netinet6/ip6_var.h>
88 #include <netinet6/nd6.h>
89 #include <netinet6/scope6_var.h>
90
91 #include <net/net_osdep.h>
92 #include <dev/random/randomdev.h>
93
94 u_int32_t in6_maxmtu = 0;
95
96 #if IP6_AUTO_LINKLOCAL
97 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
98 #else
99 int ip6_auto_linklocal = 1; /* enable by default */
100 #endif
101
102 extern struct inpcbinfo udbinfo;
103 extern struct inpcbinfo ripcbinfo;
104
105 static int get_rand_iid(struct ifnet *, struct in6_addr *);
106 static int in6_generate_tmp_iid(u_int8_t *, const u_int8_t *, u_int8_t *);
107 static int in6_select_iid_from_all_hw(struct ifnet *, struct ifnet *,
108 struct in6_addr *);
109 static int in6_ifattach_linklocal(struct ifnet *, struct in6_aliasreq *);
110 static int in6_ifattach_loopback(struct ifnet *);
111
112 /*
113 * Generate a last-resort interface identifier, when the machine has no
114 * IEEE802/EUI64 address sources.
115 * The goal here is to get an interface identifier that is
116 * (1) random enough and (2) does not change across reboot.
117 * We currently use SHA256(hostname) for it.
118 *
119 * in6 - upper 64bits are preserved
120 */
121 static int
get_rand_iid(__unused struct ifnet * ifp,struct in6_addr * in6)122 get_rand_iid(
123 __unused struct ifnet *ifp,
124 struct in6_addr *in6) /* upper 64bits are preserved */
125 {
126 SHA256_CTX ctxt;
127 u_int8_t digest[SHA256_DIGEST_LENGTH];
128 size_t hostnlen;
129
130 /* generate 8 bytes of pseudo-random value. */
131 bzero(&ctxt, sizeof(ctxt));
132 SHA256_Init(&ctxt);
133 lck_mtx_lock(&hostname_lock);
134 hostnlen = strlen(hostname);
135 SHA256_Update(&ctxt, hostname, hostnlen);
136 lck_mtx_unlock(&hostname_lock);
137 SHA256_Final(digest, &ctxt);
138
139 /* assumes sizeof (digest) > sizeof (iid) */
140 bcopy(digest, &in6->s6_addr[8], 8);
141
142 /* make sure to set "u" bit to local, and "g" bit to individual. */
143 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */
144 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */
145
146 /* convert EUI64 into IPv6 interface identifier */
147 ND6_EUI64_TO_IFID(in6);
148
149 return 0;
150 }
151
152 static int
in6_generate_tmp_iid(u_int8_t * seed0,const u_int8_t * seed1,u_int8_t * ret)153 in6_generate_tmp_iid(
154 u_int8_t *seed0,
155 const u_int8_t *seed1,
156 u_int8_t *ret)
157 {
158 SHA256_CTX ctxt;
159 u_int8_t seed[16], nullbuf[8], digest[SHA256_DIGEST_LENGTH];
160 u_int32_t val32;
161 struct timeval tv;
162
163 /* If there's no history, start with a random seed. */
164 bzero(nullbuf, sizeof(nullbuf));
165 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
166 int i;
167
168 for (i = 0; i < 2; i++) {
169 getmicrotime(&tv);
170 val32 = RandomULong() ^ tv.tv_usec;
171 bcopy(&val32, seed + sizeof(val32) * i,
172 sizeof(val32));
173 }
174 } else {
175 bcopy(seed0, seed, 8);
176 }
177
178 /* copy the right-most 64-bits of the given address */
179 /* XXX assumption on the size of IFID */
180 bcopy(seed1, &seed[8], 8);
181
182 #if DEVELOPMENT || DEBUG
183 if ((0)) { /* for debugging purposes only */
184 int i;
185
186 printf("%s: new randomized ID from: ", __func__);
187 for (i = 0; i < 16; i++) {
188 printf("%02x", seed[i]);
189 }
190 printf(" ");
191 }
192 #endif /* DEVELOPMENT || DEBUG */
193
194 /* generate 16 bytes of pseudo-random value. */
195 bzero(&ctxt, sizeof(ctxt));
196 SHA256_Init(&ctxt);
197 SHA256_Update(&ctxt, seed, sizeof(seed));
198 SHA256_Final(digest, &ctxt);
199
200 /*
201 * RFC 4941 3.2.1. (3)
202 * Take the left-most 64-bits of the SHA256 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(info,
215 "%s: computed SHA256 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 SHA256 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 DEVELOPMENT || DEBUG
231 if ((0)) { /* for debugging purposes only */
232 int i;
233
234 printf("to: ");
235 for (i = 0; i < 16; i++) {
236 printf("%02x", digest[i]);
237 }
238 printf("\n");
239 }
240 #endif
241
242 return 0;
243 }
244
245 /*
246 * Get interface identifier for the specified interface using the method in
247 * Appendix A of RFC 4291.
248 *
249 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
250 *
251 * in6 - upper 64bits are preserved
252 */
253 int
in6_iid_from_hw(struct ifnet * ifp,struct in6_addr * in6)254 in6_iid_from_hw(struct ifnet *ifp, struct in6_addr *in6)
255 {
256 struct ifaddr *ifa = NULL;
257 struct sockaddr_dl *sdl;
258 u_int8_t *addr;
259 size_t addrlen;
260 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
261 static u_int8_t allone[8] =
262 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
263 int err = -1;
264
265 /* Why doesn't this code use ifnet_addrs? */
266 ifnet_lock_shared(ifp);
267 ifa = ifp->if_lladdr;
268 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
269 if (sdl->sdl_alen == 0) {
270 ifnet_lock_done(ifp);
271 return -1;
272 }
273 IFA_ADDREF(ifa); /* for this routine */
274 ifnet_lock_done(ifp);
275
276 IFA_LOCK(ifa);
277 addr = (u_int8_t *) LLADDR(sdl);
278 addrlen = sdl->sdl_alen;
279
280 /* get EUI64 */
281 switch (ifp->if_type) {
282 case IFT_ETHER:
283 case IFT_FDDI:
284 case IFT_ISO88025:
285 case IFT_ATM:
286 case IFT_IEEE1394:
287 case IFT_L2VLAN:
288 case IFT_IEEE8023ADLAG:
289 #if IFT_IEEE80211
290 case IFT_IEEE80211:
291 #endif
292 case IFT_BRIDGE:
293 /* IEEE802/EUI64 cases - what others? */
294 /* IEEE1394 uses 16byte length address starting with EUI64 */
295 if (addrlen > 8) {
296 addrlen = 8;
297 }
298
299 /* look at IEEE802/EUI64 only */
300 if (addrlen != 8 && addrlen != 6) {
301 goto done;
302 }
303
304 /*
305 * check for invalid MAC address - on bsdi, we see it a lot
306 * since wildboar configures all-zero MAC on pccard before
307 * card insertion.
308 */
309 if (bcmp(addr, allzero, addrlen) == 0) {
310 goto done;
311 }
312 if (bcmp(addr, allone, addrlen) == 0) {
313 goto done;
314 }
315
316 /* make EUI64 address */
317 if (addrlen == 8) {
318 bcopy(addr, &in6->s6_addr[8], 8);
319 } else if (addrlen == 6) {
320 in6->s6_addr[8] = addr[0];
321 in6->s6_addr[9] = addr[1];
322 in6->s6_addr[10] = addr[2];
323 in6->s6_addr[11] = 0xff;
324 in6->s6_addr[12] = 0xfe;
325 in6->s6_addr[13] = addr[3];
326 in6->s6_addr[14] = addr[4];
327 in6->s6_addr[15] = addr[5];
328 }
329 break;
330
331 case IFT_ARCNET:
332 if (addrlen != 1) {
333 goto done;
334 }
335 if (!addr[0]) {
336 goto done;
337 }
338
339 bzero(&in6->s6_addr[8], 8);
340 in6->s6_addr[15] = addr[0];
341
342 /*
343 * due to insufficient bitwidth, we mark it local.
344 */
345 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */
346 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */
347 break;
348
349 case IFT_GIF:
350 #if IFT_STF
351 case IFT_STF:
352 #endif
353 /*
354 * RFC2893 says: "SHOULD use IPv4 address as IID source".
355 * however, IPv4 address is not very suitable as unique
356 * identifier source (can be renumbered).
357 * we don't do this.
358 */
359 goto done;
360
361 case IFT_CELLULAR:
362 goto done;
363
364 default:
365 goto done;
366 }
367
368 /* sanity check: g bit must not indicate "group" */
369 if (ND6_EUI64_GROUP(in6)) {
370 goto done;
371 }
372
373 /* convert EUI64 into IPv6 interface identifier */
374 ND6_EUI64_TO_IFID(in6);
375
376 /*
377 * sanity check: iid must not be all zero, avoid conflict with
378 * subnet router anycast
379 */
380 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 &&
381 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
382 goto done;
383 }
384
385 err = 0; /* found */
386
387 done:
388 /* This must not be the last reference to the lladdr */
389 if (IFA_REMREF_LOCKED(ifa) == NULL) {
390 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa);
391 /* NOTREACHED */
392 }
393 IFA_UNLOCK(ifa);
394 return err;
395 }
396
397 /*
398 * Get interface identifier for the specified interface using the method in
399 * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface
400 * identifier from other information sources.
401 *
402 * ifp - primary EUI64 source
403 * altifp - secondary EUI64 source
404 * in6 - IPv6 address to output IID
405 */
406 static int
in6_select_iid_from_all_hw(struct ifnet * ifp0,struct ifnet * altifp,struct in6_addr * in6)407 in6_select_iid_from_all_hw(
408 struct ifnet *ifp0,
409 struct ifnet *altifp, /* secondary EUI64 source */
410 struct in6_addr *in6)
411 {
412 struct ifnet *ifp;
413
414 /* first, try to get it from the interface itself */
415 if (in6_iid_from_hw(ifp0, in6) == 0) {
416 nd6log(debug, "%s: IID derived from HW interface.\n",
417 if_name(ifp0));
418 goto success;
419 }
420
421 /* try secondary EUI64 source. this basically is for ATM PVC */
422 if (altifp && in6_iid_from_hw(altifp, in6) == 0) {
423 nd6log(debug, "%s: IID from alterate HW interface %s.\n",
424 if_name(ifp0), if_name(altifp));
425 goto success;
426 }
427
428 /* next, try to get it from some other hardware interface */
429 ifnet_head_lock_shared();
430 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
431 if (ifp == ifp0) {
432 continue;
433 }
434 if (in6_iid_from_hw(ifp, in6) != 0) {
435 continue;
436 }
437
438 /*
439 * to borrow IID from other interface, IID needs to be
440 * globally unique
441 */
442 if (ND6_IFID_UNIVERSAL(in6)) {
443 nd6log(debug, "%s: borrowed IID from %s\n",
444 if_name(ifp0), if_name(ifp));
445 ifnet_head_done();
446 goto success;
447 }
448 }
449 ifnet_head_done();
450
451 /* last resort: get from random number source */
452 if (get_rand_iid(ifp, in6) == 0) {
453 nd6log(debug, "%s: IID from PRNG.\n", if_name(ifp0));
454 goto success;
455 }
456
457 printf("%s: failed to get interface identifier\n", if_name(ifp0));
458 return -1;
459
460 success:
461 nd6log(info, "%s: IID: "
462 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
463 if_name(ifp0),
464 in6->s6_addr[8], in6->s6_addr[9],
465 in6->s6_addr[10], in6->s6_addr[11],
466 in6->s6_addr[12], in6->s6_addr[13],
467 in6->s6_addr[14], in6->s6_addr[15]);
468 return 0;
469 }
470
471 static int
in6_ifattach_linklocal(struct ifnet * ifp,struct in6_aliasreq * ifra)472 in6_ifattach_linklocal(struct ifnet *ifp, struct in6_aliasreq *ifra)
473 {
474 struct in6_ifaddr *ia;
475 struct nd_prefix pr0, *pr;
476 int i, error;
477
478 VERIFY(ifra != NULL);
479
480 proto_plumb(PF_INET6, ifp);
481
482 error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia);
483 if (error != 0) {
484 /*
485 * XXX: When the interface does not support IPv6, this call
486 * would fail in the SIOCSIFADDR ioctl. I believe the
487 * notification is rather confusing in this case, so just
488 * suppress it. ([email protected] 20010130)
489 */
490 if (error != EAFNOSUPPORT) {
491 nd6log(info, "%s: failed to "
492 "configure a link-local address on %s "
493 "(errno=%d)\n",
494 __func__, if_name(ifp), error);
495 }
496 return EADDRNOTAVAIL;
497 }
498 VERIFY(ia != NULL);
499
500 /*
501 * Make the link-local prefix (fe80::%link/64) as on-link.
502 * Since we'd like to manage prefixes separately from addresses,
503 * we make an ND6 prefix structure for the link-local prefix,
504 * and add it to the prefix list as a never-expire prefix.
505 * XXX: this change might affect some existing code base...
506 */
507 bzero(&pr0, sizeof(pr0));
508 lck_mtx_init(&pr0.ndpr_lock, &ifa_mtx_grp, &ifa_mtx_attr);
509 pr0.ndpr_ifp = ifp;
510 /* this should be 64 at this moment. */
511 pr0.ndpr_plen = (u_char)in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL);
512 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
513 pr0.ndpr_prefix = ifra->ifra_addr;
514 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
515 for (i = 0; i < 4; i++) {
516 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
517 in6mask64.s6_addr32[i];
518 }
519 /*
520 * Initialize parameters. The link-local prefix must always be
521 * on-link, and its lifetimes never expire.
522 */
523 pr0.ndpr_raf_onlink = 1;
524 pr0.ndpr_raf_auto = 1; /* probably meaningless */
525 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
526 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
527 pr0.ndpr_stateflags |= NDPRF_STATIC;
528 /*
529 * Since there is no other link-local addresses, nd6_prefix_lookup()
530 * probably returns NULL. However, we cannot always expect the result.
531 * For example, if we first remove the (only) existing link-local
532 * address, and then reconfigure another one, the prefix is still
533 * valid with referring to the old link-local address.
534 */
535 if ((pr = nd6_prefix_lookup(&pr0, ND6_PREFIX_EXPIRY_UNSPEC)) == NULL) {
536 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) {
537 IFA_REMREF(&ia->ia_ifa);
538 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
539 return error;
540 }
541 }
542
543 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL);
544 IFA_REMREF(&ia->ia_ifa);
545
546 /* Drop use count held above during lookup/add */
547 if (pr != NULL) {
548 NDPR_REMREF(pr);
549 }
550
551 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
552 return 0;
553 }
554
555 static int
in6_ifattach_loopback(struct ifnet * ifp)556 in6_ifattach_loopback(
557 struct ifnet *ifp) /* must be IFT_LOOP */
558 {
559 struct in6_aliasreq ifra;
560 struct in6_ifaddr *ia;
561 int error;
562
563 bzero(&ifra, sizeof(ifra));
564
565 /*
566 * in6_update_ifa() does not use ifra_name, but we accurately set it
567 * for safety.
568 */
569 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
570
571 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
572 ifra.ifra_prefixmask.sin6_family = AF_INET6;
573 ifra.ifra_prefixmask.sin6_addr = in6mask128;
574
575 /*
576 * Always initialize ia_dstaddr (= broadcast address) to loopback
577 * address. Follows IPv4 practice - see in_ifinit().
578 */
579 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
580 ifra.ifra_dstaddr.sin6_family = AF_INET6;
581 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
582
583 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
584 ifra.ifra_addr.sin6_family = AF_INET6;
585 ifra.ifra_addr.sin6_addr = in6addr_loopback;
586
587 /* the loopback address should NEVER expire. */
588 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
589 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
590
591 /* we don't need to perform DAD on loopback interfaces. */
592 ifra.ifra_flags |= IN6_IFF_NODAD;
593
594 /* add the new interface address */
595 error = in6_update_ifa(ifp, &ifra, 0, &ia);
596 if (error != 0) {
597 nd6log(error,
598 "%s: failed to configure loopback address %s (error=%d)\n",
599 __func__, if_name(ifp), error);
600 VERIFY(ia == NULL);
601 return EADDRNOTAVAIL;
602 }
603
604 VERIFY(ia != NULL);
605 IFA_REMREF(&ia->ia_ifa);
606 return 0;
607 }
608
609 /*
610 * compute NI group address, based on the current hostname setting.
611 * see RFC 4620.
612 *
613 * when ifp == NULL, the caller is responsible for filling scopeid.
614 */
615 int
in6_nigroup(struct ifnet * ifp,const char * name,size_t namelen,struct in6_addr * in6,uint32_t * ifscopep)616 in6_nigroup(
617 struct ifnet *ifp,
618 const char *name,
619 size_t namelen,
620 struct in6_addr *in6,
621 uint32_t *ifscopep)
622 {
623 const char *p;
624 u_char *q;
625 SHA256_CTX ctxt;
626 u_int8_t digest[SHA256_DIGEST_LENGTH];
627 size_t l;
628 char n[64]; /* a single label must not exceed 63 chars */
629
630 if (!namelen || !name) {
631 return -1;
632 }
633
634 p = name;
635 while (p && *p && *p != '.' && p - name < namelen) {
636 p++;
637 }
638 if (p - name > sizeof(n) - 1) {
639 return -1; /* label too long */
640 }
641 l = p - name;
642 strlcpy(n, name, l);
643 n[(int)l] = '\0';
644 for (q = (u_char *) n; *q; q++) {
645 if ('A' <= *q && *q <= 'Z') {
646 *q = *q - 'A' + 'a';
647 }
648 }
649
650 /* generate 16 bytes of pseudo-random value. */
651 bzero(&ctxt, sizeof(ctxt));
652 SHA256_Init(&ctxt);
653 SHA256_Update(&ctxt, &l, sizeof(l));
654 SHA256_Update(&ctxt, n, l);
655 SHA256_Final(digest, &ctxt);
656
657 bzero(in6, sizeof(*in6));
658 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
659 in6->s6_addr8[11] = 2;
660 in6->s6_addr8[12] = 0xff;
661 /* copy first 3 bytes of prefix into address */
662 bcopy(digest, &in6->s6_addr8[13], 3);
663 if (in6_setscope(in6, ifp, ifscopep)) {
664 return -1; /* XXX: should not fail */
665 }
666 return 0;
667 }
668
669 int
in6_domifattach(struct ifnet * ifp)670 in6_domifattach(struct ifnet *ifp)
671 {
672 int error;
673
674 VERIFY(ifp != NULL);
675
676 error = proto_plumb(PF_INET6, ifp);
677 if (error != 0) {
678 if (error != EEXIST) {
679 log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n",
680 __func__, error, if_name(ifp));
681 }
682 } else {
683 error = in6_ifattach_prelim(ifp);
684 if (error != 0) {
685 int errorx;
686
687 log(LOG_ERR,
688 "%s: in6_ifattach_prelim returned %d if=%s%d\n",
689 __func__, error, ifp->if_name, ifp->if_unit);
690
691 errorx = proto_unplumb(PF_INET6, ifp);
692 if (errorx != 0) { /* XXX should not fail */
693 log(LOG_ERR,
694 "%s: proto_unplumb returned %d if=%s%d\n",
695 __func__, errorx, ifp->if_name,
696 ifp->if_unit);
697 }
698 }
699 }
700
701 return error;
702 }
703
704 int
in6_ifattach_prelim(struct ifnet * ifp)705 in6_ifattach_prelim(struct ifnet *ifp)
706 {
707 int error = 0;
708 struct in6_ifaddr *ia6 = NULL;
709
710 VERIFY(ifp != NULL);
711
712 /* quirks based on interface type */
713 switch (ifp->if_type) {
714 #if IFT_STF
715 case IFT_STF:
716 /*
717 * 6to4 interface is a very special kind of beast.
718 * no multicast, no linklocal. RFC2529 specifies how to make
719 * linklocals for 6to4 interface, but there's no use and
720 * it is rather harmful to have one.
721 */
722 goto skipmcast;
723 #endif
724 default:
725 break;
726 }
727
728 /*
729 * IPv6 requires multicast capability at the interface.
730 * (previously, this was a silent error.)
731 */
732 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
733 nd6log0(info, "in6_ifattach: %s is not multicast capable, IPv6 not enabled\n",
734 if_name(ifp));
735 return EINVAL;
736 }
737
738 #if IFT_STF
739 skipmcast:
740 #endif
741
742 if (ifp->if_inet6data == NULL) {
743 ifp->if_inet6data = zalloc_permanent_type(struct in6_ifextra);
744 } else {
745 /*
746 * Since the structure is never freed, we need to zero out
747 * some of its members. We avoid zeroing out the scope6
748 * structure on purpose because other threads might be
749 * using its contents.
750 */
751 bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat,
752 sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat));
753 bzero(&IN6_IFEXTRA(ifp)->in6_ifstat,
754 sizeof(IN6_IFEXTRA(ifp)->in6_ifstat));
755 /*
756 * XXX When recycling, nd_ifinfo gets initialized, other
757 * than the lock, inside nd6_ifattach
758 */
759 }
760
761 /*
762 * XXX Only initialize IPv6 configuration for the interface
763 * if interface has not yet been configured with
764 * link local IPv6 address.
765 * Could possibly be optimized with an interface flag if need
766 * be. For now using in6ifa_ifpforlinklocal.
767 */
768 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
769 if (ia6 == NULL) {
770 IN6_IFEXTRA(ifp)->netsig_len = 0;
771 bzero(&IN6_IFEXTRA(ifp)->netsig,
772 sizeof(IN6_IFEXTRA(ifp)->netsig));
773 bzero(IN6_IFEXTRA(ifp)->nat64_prefixes,
774 sizeof(IN6_IFEXTRA(ifp)->nat64_prefixes));
775 /* initialize NDP variables */
776 nd6_ifattach(ifp);
777 } else {
778 VERIFY(ND_IFINFO(ifp)->initialized);
779 IFA_REMREF(&ia6->ia_ifa);
780 ia6 = NULL;
781 }
782 scope6_ifattach(ifp);
783
784 /* initialize loopback interface address */
785 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
786 error = in6_ifattach_loopback(ifp);
787 if (error != 0) {
788 log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n",
789 __func__, error);
790 return error;
791 }
792 }
793
794 /* update dynamically. */
795 if (in6_maxmtu < ifp->if_mtu) {
796 in6_maxmtu = ifp->if_mtu;
797 }
798
799 VERIFY(error == 0);
800 return 0;
801 }
802
803 /*
804 * This routine is only meant to configure IPv6 Link Local
805 * addresses.
806 */
807 int
in6_ifattach_aliasreq(struct ifnet * ifp,struct ifnet * altifp,struct in6_aliasreq * ifra0)808 in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp,
809 struct in6_aliasreq *ifra0)
810 {
811 int error;
812 struct in6_ifaddr *ia6;
813 struct in6_aliasreq ifra;
814
815 error = in6_ifattach_prelim(ifp);
816 if (error != 0) {
817 return error;
818 }
819
820 if (!ip6_auto_linklocal) {
821 return 0;
822 }
823
824 /*
825 * Assign a link-local address, only if there isn't one here already.
826 * XXX If we ever allow more than one LLA on the interface
827 * make sure that the corresponding prefix on the prefixlist
828 * is reference counted and the address's prefix pointer
829 * points to the prefix.
830 */
831 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
832 if (ia6 != NULL) {
833 IFA_REMREF(&ia6->ia_ifa);
834 return 0;
835 }
836
837 bzero(&ifra, sizeof(ifra));
838
839 /*
840 * in6_update_ifa() does not use ifra_name, but we accurately set it
841 * for safety.
842 */
843 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
844
845 /* Initialize the IPv6 interface address in our in6_aliasreq block */
846 if (ifra0 != NULL) {
847 /* interface provided both addresses for us */
848 struct sockaddr_in6 *sin6 = &ifra.ifra_addr;
849 struct in6_addr *in6 = &sin6->sin6_addr;
850 boolean_t ok = TRUE;
851
852 bcopy(&ifra0->ifra_addr, sin6, sizeof(struct sockaddr_in6));
853
854 if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0) {
855 ok = FALSE;
856 }
857 if (ok && (in6->s6_addr16[0] != htons(0xfe80))) {
858 ok = FALSE;
859 }
860
861 if (ok) {
862 if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0) {
863 if (in6_embedded_scope) {
864 in6->s6_addr16[1] = htons(ifp->if_index);
865 } else {
866 sin6->sin6_scope_id = ifp->if_index;
867 }
868 } else if (sin6->sin6_scope_id != 0 &&
869 sin6->sin6_scope_id != ifp->if_index) {
870 ok = FALSE;
871 } else if (in6_embedded_scope && in6->s6_addr16[1] != 0 &&
872 ntohs(in6->s6_addr16[1]) != ifp->if_index) {
873 ok = FALSE;
874 }
875 }
876 if (ok && (in6->s6_addr32[1] != 0)) {
877 ok = FALSE;
878 }
879 if (!ok) {
880 return EINVAL;
881 }
882 } else {
883 ifra.ifra_addr.sin6_family = AF_INET6;
884 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
885 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
886 if (in6_embedded_scope) {
887 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
888 } else {
889 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
890 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
891 }
892 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
893 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
894 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
895 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
896 if (!in6_embedded_scope) {
897 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
898 }
899 } else {
900 if (in6_select_iid_from_all_hw(ifp, altifp,
901 &ifra.ifra_addr.sin6_addr) != 0) {
902 nd6log(error, "%s: no IID available\n",
903 if_name(ifp));
904 return EADDRNOTAVAIL;
905 }
906 }
907 }
908
909 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
910 return EADDRNOTAVAIL;
911 }
912
913 /* Set the prefix mask */
914 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
915 ifra.ifra_prefixmask.sin6_family = AF_INET6;
916 ifra.ifra_prefixmask.sin6_addr = in6mask64;
917
918 /* link-local addresses should NEVER expire. */
919 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
920 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
921
922 /* Attach the link-local address */
923 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
924 nd6log(info,
925 "%s: %s could not attach link-local address.\n",
926 __func__, if_name(ifp));
927 /* NB: not an error */
928 }
929
930 return 0;
931 }
932
933 int
in6_ifattach_llcgareq(struct ifnet * ifp,struct in6_cgareq * llcgasr)934 in6_ifattach_llcgareq(struct ifnet *ifp, struct in6_cgareq *llcgasr)
935 {
936 struct in6_aliasreq ifra;
937 struct in6_ifaddr *ia6 = NULL;
938 struct nd_ifinfo *ndi = NULL;
939 int error;
940
941 VERIFY(llcgasr != NULL);
942
943 error = in6_ifattach_prelim(ifp);
944 if (error != 0) {
945 return error;
946 }
947
948 if (!ip6_auto_linklocal) {
949 return 0;
950 }
951
952 if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED) {
953 return ENXIO;
954 }
955
956 ndi = ND_IFINFO(ifp);
957 VERIFY(ndi != NULL && ndi->initialized);
958 if ((ndi->flags & ND6_IFF_INSECURE) != 0) {
959 return ENXIO;
960 }
961
962 /*
963 * Assign a link-local address, only if there isn't one here already.
964 * XXX If we ever allow more than one LLA on the interface
965 * make sure that the corresponding prefix on the prefixlist
966 * is reference counted and the address's prefix pointer
967 * points to the prefix.
968 */
969 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
970 if (ia6 != NULL) {
971 IFA_REMREF(&ia6->ia_ifa);
972 return 0;
973 }
974
975 bzero(&ifra, sizeof(ifra));
976 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
977
978 ifra.ifra_addr.sin6_family = AF_INET6;
979 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
980 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
981 if (in6_embedded_scope) {
982 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
983 } else {
984 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
985 }
986 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
987 ifra.ifra_flags = IN6_IFF_SECURED;
988
989 in6_cga_node_lock();
990 if (in6_cga_generate(&llcgasr->cgar_cgaprep, llcgasr->cgar_collision_count,
991 &ifra.ifra_addr.sin6_addr, ifp)) {
992 in6_cga_node_unlock();
993 return EADDRNOTAVAIL;
994 }
995 in6_cga_node_unlock();
996
997 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
998 return EADDRNOTAVAIL;
999 }
1000
1001 /* Set the prefix mask */
1002 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1003 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1004 ifra.ifra_prefixmask.sin6_addr = in6mask64;
1005
1006 /*
1007 * link-local addresses should NEVER expire, but cryptographic
1008 * ones may have finite preferred lifetime [if it's important to
1009 * keep them from being used by applications as persistent device
1010 * identifiers].
1011 */
1012 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1013 ifra.ifra_lifetime.ia6t_pltime = llcgasr->cgar_lifetime.ia6t_pltime;
1014
1015 /* Attach the link-local address */
1016 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
1017 /* NB: not an error */
1018 nd6log(info,
1019 "%s: %s could not attach link-local address.\n",
1020 __func__, if_name(ifp));
1021 }
1022
1023 VERIFY(error == 0);
1024 return error;
1025 }
1026
1027 /*
1028 * NOTE: in6_ifdetach() does not support loopback if at this moment.
1029 */
1030 void
in6_ifdetach(struct ifnet * ifp)1031 in6_ifdetach(struct ifnet *ifp)
1032 {
1033 struct in6_ifaddr *ia, *nia;
1034 struct ifaddr *ifa;
1035 struct rtentry *rt;
1036 struct sockaddr_in6 sin6;
1037 struct in6_multi_mship *imm;
1038 int unlinked;
1039
1040 LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED);
1041
1042 /* remove neighbor management table */
1043 nd6_purge(ifp);
1044
1045 /* nuke any of IPv6 addresses we have */
1046 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1047 boolean_t from_begining = TRUE;
1048 while (from_begining) {
1049 from_begining = FALSE;
1050 TAILQ_FOREACH(ia, &in6_ifaddrhead, ia6_link) {
1051 if (ia->ia_ifa.ifa_ifp != ifp) {
1052 continue;
1053 }
1054 IFA_ADDREF(&ia->ia_ifa); /* for us */
1055 lck_rw_done(&in6_ifaddr_rwlock);
1056 in6_purgeaddr(&ia->ia_ifa);
1057 IFA_REMREF(&ia->ia_ifa); /* for us */
1058 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1059 /*
1060 * Purging the address caused in6_ifaddr_rwlock
1061 * to be dropped and reacquired;
1062 * therefore search again from the beginning
1063 * of in6_ifaddrs list.
1064 */
1065 from_begining = TRUE;
1066 break;
1067 }
1068 }
1069 lck_rw_done(&in6_ifaddr_rwlock);
1070
1071 ifnet_lock_exclusive(ifp);
1072
1073 /* undo everything done by in6_ifattach(), just in case */
1074 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1075 while (ifa != NULL) {
1076 IFA_LOCK(ifa);
1077 if (ifa->ifa_addr->sa_family != AF_INET6 ||
1078 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->
1079 sin6_addr)) {
1080 IFA_UNLOCK(ifa);
1081 ifa = TAILQ_NEXT(ifa, ifa_list);
1082 continue;
1083 }
1084
1085 ia = (struct in6_ifaddr *)ifa;
1086
1087 /* hold a reference for this routine */
1088 IFA_ADDREF_LOCKED(ifa);
1089 /* remove from the linked list */
1090 if_detach_ifa(ifp, ifa);
1091 IFA_UNLOCK(ifa);
1092
1093 /*
1094 * Leaving the multicast group(s) may involve freeing the
1095 * link address multicast structure(s) for the interface,
1096 * which is protected by ifnet lock. To avoid violating
1097 * lock ordering, we must drop ifnet lock before doing so.
1098 * The ifa won't go away since we held a refcnt above.
1099 */
1100 ifnet_lock_done(ifp);
1101
1102 /*
1103 * We have to do this work manually here instead of calling
1104 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag.
1105 */
1106
1107 /*
1108 * leave from multicast groups we have joined for the interface
1109 */
1110 IFA_LOCK(ifa);
1111 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1112 LIST_REMOVE(imm, i6mm_chain);
1113 IFA_UNLOCK(ifa);
1114 in6_leavegroup(imm);
1115 IFA_LOCK(ifa);
1116 }
1117
1118 /* remove from the routing table */
1119 if (ia->ia_flags & IFA_ROUTE) {
1120 IFA_UNLOCK(ifa);
1121 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0);
1122 if (rt != NULL) {
1123 (void) rtrequest(RTM_DELETE,
1124 (struct sockaddr *)&ia->ia_addr,
1125 (struct sockaddr *)&ia->ia_addr,
1126 (struct sockaddr *)&ia->ia_prefixmask,
1127 rt->rt_flags, (struct rtentry **)0);
1128 rtfree(rt);
1129 }
1130 } else {
1131 IFA_UNLOCK(ifa);
1132 }
1133
1134 /* also remove from the IPv6 address chain(itojun&jinmei) */
1135 unlinked = 0;
1136 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1137 TAILQ_FOREACH(nia, &in6_ifaddrhead, ia6_link) {
1138 if (ia == nia) {
1139 TAILQ_REMOVE(&in6_ifaddrhead, ia, ia6_link);
1140 os_atomic_inc(&in6_ifaddrlist_genid, relaxed);
1141 unlinked = 1;
1142 break;
1143 }
1144 }
1145 lck_rw_done(&in6_ifaddr_rwlock);
1146
1147 /*
1148 * release another refcnt for the link from in6_ifaddrs.
1149 * Do this only if it's not already unlinked in the event
1150 * that we lost the race, since in6_ifaddr_rwlock was
1151 * momentarily dropped above.
1152 */
1153 if (unlinked) {
1154 IFA_REMREF(ifa);
1155 }
1156 /* release reference held for this routine */
1157 IFA_REMREF(ifa);
1158
1159 /*
1160 * This is suboptimal, but since we dropped ifnet lock above
1161 * the list might have changed. Repeat the search from the
1162 * beginning until we find the first eligible IPv6 address.
1163 */
1164 ifnet_lock_exclusive(ifp);
1165 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1166 }
1167 ifnet_lock_done(ifp);
1168
1169 /* invalidate route caches */
1170 routegenid_inet6_update();
1171
1172 /*
1173 * remove neighbor management table. we call it twice just to make
1174 * sure we nuke everything. maybe we need just one call.
1175 * XXX: since the first call did not release addresses, some prefixes
1176 * might remain. We should call nd6_purge() again to release the
1177 * prefixes after removing all addresses above.
1178 * (Or can we just delay calling nd6_purge until at this point?)
1179 */
1180 nd6_purge(ifp);
1181
1182 /* remove route to link-local allnodes multicast (ff02::1) */
1183 bzero(&sin6, sizeof(sin6));
1184 sin6.sin6_len = sizeof(struct sockaddr_in6);
1185 sin6.sin6_family = AF_INET6;
1186 sin6.sin6_addr = in6addr_linklocal_allnodes;
1187 if (in6_embedded_scope) {
1188 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1189 } else {
1190 sin6.sin6_scope_id = ifp->if_index;
1191 }
1192 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
1193 if (rt != NULL) {
1194 RT_LOCK(rt);
1195 if (rt->rt_ifp == ifp) {
1196 /*
1197 * Prevent another thread from modifying rt_key,
1198 * rt_gateway via rt_setgate() after the rt_lock
1199 * is dropped by marking the route as defunct.
1200 */
1201 rt->rt_flags |= RTF_CONDEMNED;
1202 RT_UNLOCK(rt);
1203 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1204 rt_mask(rt), rt->rt_flags, 0);
1205 } else {
1206 RT_UNLOCK(rt);
1207 }
1208 rtfree(rt);
1209 }
1210 }
1211
1212 void
in6_iid_mktmp(struct ifnet * ifp,u_int8_t * retbuf,const u_int8_t * baseid,int generate)1213 in6_iid_mktmp(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
1214 int generate)
1215 {
1216 u_int8_t nullbuf[8];
1217 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
1218
1219 VERIFY(ndi != NULL && ndi->initialized);
1220 lck_mtx_lock(&ndi->lock);
1221 bzero(nullbuf, sizeof(nullbuf));
1222 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
1223 /* we've never created a random ID. Create a new one. */
1224 generate = 1;
1225 }
1226
1227 if (generate) {
1228 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
1229
1230 /* in6_generate_tmp_iid will update seedn and buf */
1231 (void) in6_generate_tmp_iid(ndi->randomseed0, ndi->randomseed1,
1232 ndi->randomid);
1233 }
1234
1235 bcopy(ndi->randomid, retbuf, 8);
1236 lck_mtx_unlock(&ndi->lock);
1237 }
1238
1239 void
in6_tmpaddrtimer(void * arg)1240 in6_tmpaddrtimer(void *arg)
1241 {
1242 #pragma unused(arg)
1243 struct ifnet *ifp = NULL;
1244 struct nd_ifinfo *ndi = NULL;
1245 u_int8_t nullbuf[8];
1246
1247 timeout(in6_tmpaddrtimer, (caddr_t)0, (ip6_temp_preferred_lifetime -
1248 ip6_desync_factor - ip6_temp_regen_advance) * hz);
1249
1250 bzero(nullbuf, sizeof(nullbuf));
1251 ifnet_head_lock_shared();
1252 for (ifp = ifnet_head.tqh_first; ifp;
1253 ifp = ifp->if_link.tqe_next) {
1254 ndi = ND_IFINFO(ifp);
1255 if ((NULL == ndi) || (FALSE == ndi->initialized)) {
1256 continue;
1257 }
1258 lck_mtx_lock(&ndi->lock);
1259 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
1260 /*
1261 * We've been generating a random ID on this interface.
1262 * Create a new one.
1263 */
1264 (void) in6_generate_tmp_iid(ndi->randomseed0,
1265 ndi->randomseed1, ndi->randomid);
1266 }
1267 lck_mtx_unlock(&ndi->lock);
1268 }
1269 ifnet_head_done();
1270 }
1271