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/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
95 u_int32_t in6_maxmtu = 0;
96
97 #if IP6_AUTO_LINKLOCAL
98 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
99 #else
100 int ip6_auto_linklocal = 1; /* enable by default */
101 #endif
102
103 extern struct inpcbinfo udbinfo;
104 extern struct inpcbinfo ripcbinfo;
105
106 static int get_rand_iid(struct ifnet *, struct in6_addr *);
107 static int in6_generate_tmp_iid(u_int8_t *, const u_int8_t *, u_int8_t *);
108 static int in6_select_iid_from_all_hw(struct ifnet *, struct ifnet *,
109 struct in6_addr *);
110 static int in6_ifattach_linklocal(struct ifnet *, struct in6_aliasreq *);
111 static int in6_ifattach_loopback(struct ifnet *);
112
113 /*
114 * Generate a last-resort interface identifier, when the machine has no
115 * IEEE802/EUI64 address sources.
116 * The goal here is to get an interface identifier that is
117 * (1) random enough and (2) does not change across reboot.
118 * We currently use SHA1(hostname) for it.
119 *
120 * in6 - upper 64bits are preserved
121 */
122 static int
get_rand_iid(__unused struct ifnet * ifp,struct in6_addr * in6)123 get_rand_iid(
124 __unused struct ifnet *ifp,
125 struct in6_addr *in6) /* upper 64bits are preserved */
126 {
127 SHA1_CTX ctxt;
128 u_int8_t digest[SHA1_RESULTLEN];
129 size_t hostnlen;
130
131 /* generate 8 bytes of pseudo-random value. */
132 bzero(&ctxt, sizeof(ctxt));
133 SHA1Init(&ctxt);
134 lck_mtx_lock(&hostname_lock);
135 hostnlen = strlen(hostname);
136 SHA1Update(&ctxt, hostname, hostnlen);
137 lck_mtx_unlock(&hostname_lock);
138 SHA1Final(digest, &ctxt);
139
140 /* assumes sizeof (digest) > sizeof (iid) */
141 bcopy(digest, &in6->s6_addr[8], 8);
142
143 /* make sure to set "u" bit to local, and "g" bit to individual. */
144 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */
145 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */
146
147 /* convert EUI64 into IPv6 interface identifier */
148 ND6_EUI64_TO_IFID(in6);
149
150 return 0;
151 }
152
153 static int
in6_generate_tmp_iid(u_int8_t * seed0,const u_int8_t * seed1,u_int8_t * ret)154 in6_generate_tmp_iid(
155 u_int8_t *seed0,
156 const u_int8_t *seed1,
157 u_int8_t *ret)
158 {
159 SHA1_CTX ctxt;
160 u_int8_t seed[16], nullbuf[8], digest[SHA1_RESULTLEN];
161 u_int32_t val32;
162 struct timeval tv;
163
164 /* If there's no history, start with a random seed. */
165 bzero(nullbuf, sizeof(nullbuf));
166 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
167 int i;
168
169 for (i = 0; i < 2; i++) {
170 getmicrotime(&tv);
171 val32 = RandomULong() ^ tv.tv_usec;
172 bcopy(&val32, seed + sizeof(val32) * i,
173 sizeof(val32));
174 }
175 } else {
176 bcopy(seed0, seed, 8);
177 }
178
179 /* copy the right-most 64-bits of the given address */
180 /* XXX assumption on the size of IFID */
181 bcopy(seed1, &seed[8], 8);
182
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
193 /* generate 16 bytes of pseudo-random value. */
194 bzero(&ctxt, sizeof(ctxt));
195 SHA1Init(&ctxt);
196 SHA1Update(&ctxt, seed, sizeof(seed));
197 SHA1Final(digest, &ctxt);
198
199 /*
200 * RFC 4941 3.2.1. (3)
201 * Take the left-most 64-bits of the SHA1 digest and set bit 6 (the
202 * left-most bit is numbered 0) to zero.
203 */
204 bcopy(digest, ret, 8);
205 ret[0] &= ~ND6_EUI64_UBIT;
206
207 /*
208 * XXX: we'd like to ensure that the generated value is not zero
209 * for simplicity. If the caclculated digest happens to be zero,
210 * use a random non-zero value as the last resort.
211 */
212 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
213 nd6log(info,
214 "%s: computed SHA1 value is zero.\n", __func__);
215
216 getmicrotime(&tv);
217 val32 = random() ^ tv.tv_usec;
218 val32 = 1 + (val32 % (0xffffffff - 1));
219 }
220
221 /*
222 * RFC 4941 3.2.1. (4)
223 * Take the next 64-bits of the SHA1 digest and save them in
224 * stable storage as the history value to be used in the next
225 * iteration of the algorithm.
226 */
227 bcopy(&digest[8], seed0, 8);
228
229 if ((0)) { /* for debugging purposes only */
230 int i;
231
232 printf("to: ");
233 for (i = 0; i < 16; i++) {
234 printf("%02x", digest[i]);
235 }
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 */
250 int
in6_iid_from_hw(struct ifnet * ifp,struct in6_addr * in6)251 in6_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
296 /* look at IEEE802/EUI64 only */
297 if (addrlen != 8 && addrlen != 6) {
298 goto done;
299 }
300
301 /*
302 * check for invalid MAC address - on bsdi, we see it a lot
303 * since wildboar configures all-zero MAC on pccard before
304 * card insertion.
305 */
306 if (bcmp(addr, allzero, addrlen) == 0) {
307 goto done;
308 }
309 if (bcmp(addr, allone, addrlen) == 0) {
310 goto done;
311 }
312
313 /* make EUI64 address */
314 if (addrlen == 8) {
315 bcopy(addr, &in6->s6_addr[8], 8);
316 } else if (addrlen == 6) {
317 in6->s6_addr[8] = addr[0];
318 in6->s6_addr[9] = addr[1];
319 in6->s6_addr[10] = addr[2];
320 in6->s6_addr[11] = 0xff;
321 in6->s6_addr[12] = 0xfe;
322 in6->s6_addr[13] = addr[3];
323 in6->s6_addr[14] = addr[4];
324 in6->s6_addr[15] = addr[5];
325 }
326 break;
327
328 case IFT_ARCNET:
329 if (addrlen != 1) {
330 goto done;
331 }
332 if (!addr[0]) {
333 goto done;
334 }
335
336 bzero(&in6->s6_addr[8], 8);
337 in6->s6_addr[15] = addr[0];
338
339 /*
340 * due to insufficient bitwidth, we mark it local.
341 */
342 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */
343 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */
344 break;
345
346 case IFT_GIF:
347 #if IFT_STF
348 case IFT_STF:
349 #endif
350 /*
351 * RFC2893 says: "SHOULD use IPv4 address as IID source".
352 * however, IPv4 address is not very suitable as unique
353 * identifier source (can be renumbered).
354 * we don't do this.
355 */
356 goto done;
357
358 case IFT_CELLULAR:
359 goto done;
360
361 default:
362 goto done;
363 }
364
365 /* sanity check: g bit must not indicate "group" */
366 if (ND6_EUI64_GROUP(in6)) {
367 goto done;
368 }
369
370 /* convert EUI64 into IPv6 interface identifier */
371 ND6_EUI64_TO_IFID(in6);
372
373 /*
374 * sanity check: iid must not be all zero, avoid conflict with
375 * subnet router anycast
376 */
377 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 &&
378 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
379 goto done;
380 }
381
382 err = 0; /* found */
383
384 done:
385 /* This must not be the last reference to the lladdr */
386 if (IFA_REMREF_LOCKED(ifa) == NULL) {
387 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa);
388 /* NOTREACHED */
389 }
390 IFA_UNLOCK(ifa);
391 return err;
392 }
393
394 /*
395 * Get interface identifier for the specified interface using the method in
396 * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface
397 * identifier from other information sources.
398 *
399 * ifp - primary EUI64 source
400 * altifp - secondary EUI64 source
401 * in6 - IPv6 address to output IID
402 */
403 static int
in6_select_iid_from_all_hw(struct ifnet * ifp0,struct ifnet * altifp,struct in6_addr * in6)404 in6_select_iid_from_all_hw(
405 struct ifnet *ifp0,
406 struct ifnet *altifp, /* secondary EUI64 source */
407 struct in6_addr *in6)
408 {
409 struct ifnet *ifp;
410
411 /* first, try to get it from the interface itself */
412 if (in6_iid_from_hw(ifp0, in6) == 0) {
413 nd6log(debug, "%s: IID derived from HW interface.\n",
414 if_name(ifp0));
415 goto success;
416 }
417
418 /* try secondary EUI64 source. this basically is for ATM PVC */
419 if (altifp && in6_iid_from_hw(altifp, in6) == 0) {
420 nd6log(debug, "%s: IID from alterate HW interface %s.\n",
421 if_name(ifp0), if_name(altifp));
422 goto success;
423 }
424
425 /* next, try to get it from some other hardware interface */
426 ifnet_head_lock_shared();
427 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
428 if (ifp == ifp0) {
429 continue;
430 }
431 if (in6_iid_from_hw(ifp, in6) != 0) {
432 continue;
433 }
434
435 /*
436 * to borrow IID from other interface, IID needs to be
437 * globally unique
438 */
439 if (ND6_IFID_UNIVERSAL(in6)) {
440 nd6log(debug, "%s: borrowed IID from %s\n",
441 if_name(ifp0), if_name(ifp));
442 ifnet_head_done();
443 goto success;
444 }
445 }
446 ifnet_head_done();
447
448 /* last resort: get from random number source */
449 if (get_rand_iid(ifp, in6) == 0) {
450 nd6log(debug, "%s: IID from PRNG.\n", if_name(ifp0));
451 goto success;
452 }
453
454 printf("%s: failed to get interface identifier\n", if_name(ifp0));
455 return -1;
456
457 success:
458 nd6log(info, "%s: IID: "
459 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
460 if_name(ifp0),
461 in6->s6_addr[8], in6->s6_addr[9],
462 in6->s6_addr[10], in6->s6_addr[11],
463 in6->s6_addr[12], in6->s6_addr[13],
464 in6->s6_addr[14], in6->s6_addr[15]);
465 return 0;
466 }
467
468 static int
in6_ifattach_linklocal(struct ifnet * ifp,struct in6_aliasreq * ifra)469 in6_ifattach_linklocal(struct ifnet *ifp, struct in6_aliasreq *ifra)
470 {
471 struct in6_ifaddr *ia;
472 struct nd_prefix pr0, *pr;
473 int i, error;
474
475 VERIFY(ifra != NULL);
476
477 proto_plumb(PF_INET6, ifp);
478
479 error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia);
480 if (error != 0) {
481 /*
482 * XXX: When the interface does not support IPv6, this call
483 * would fail in the SIOCSIFADDR ioctl. I believe the
484 * notification is rather confusing in this case, so just
485 * suppress it. ([email protected] 20010130)
486 */
487 if (error != EAFNOSUPPORT) {
488 nd6log(info, "%s: failed to "
489 "configure a link-local address on %s "
490 "(errno=%d)\n",
491 __func__, if_name(ifp), error);
492 }
493 return EADDRNOTAVAIL;
494 }
495 VERIFY(ia != NULL);
496
497 /*
498 * Make the link-local prefix (fe80::%link/64) as on-link.
499 * Since we'd like to manage prefixes separately from addresses,
500 * we make an ND6 prefix structure for the link-local prefix,
501 * and add it to the prefix list as a never-expire prefix.
502 * XXX: this change might affect some existing code base...
503 */
504 bzero(&pr0, sizeof(pr0));
505 lck_mtx_init(&pr0.ndpr_lock, &ifa_mtx_grp, &ifa_mtx_attr);
506 pr0.ndpr_ifp = ifp;
507 /* this should be 64 at this moment. */
508 pr0.ndpr_plen = (u_char)in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL);
509 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
510 pr0.ndpr_prefix = ifra->ifra_addr;
511 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
512 for (i = 0; i < 4; i++) {
513 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
514 in6mask64.s6_addr32[i];
515 }
516 /*
517 * Initialize parameters. The link-local prefix must always be
518 * on-link, and its lifetimes never expire.
519 */
520 pr0.ndpr_raf_onlink = 1;
521 pr0.ndpr_raf_auto = 1; /* probably meaningless */
522 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
523 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
524 pr0.ndpr_stateflags |= NDPRF_STATIC;
525 /*
526 * Since there is no other link-local addresses, nd6_prefix_lookup()
527 * probably returns NULL. However, we cannot always expect the result.
528 * For example, if we first remove the (only) existing link-local
529 * address, and then reconfigure another one, the prefix is still
530 * valid with referring to the old link-local address.
531 */
532 if ((pr = nd6_prefix_lookup(&pr0, ND6_PREFIX_EXPIRY_UNSPEC)) == NULL) {
533 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) {
534 IFA_REMREF(&ia->ia_ifa);
535 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
536 return error;
537 }
538 }
539
540 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL);
541 IFA_REMREF(&ia->ia_ifa);
542
543 /* Drop use count held above during lookup/add */
544 if (pr != NULL) {
545 NDPR_REMREF(pr);
546 }
547
548 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
549 return 0;
550 }
551
552 static int
in6_ifattach_loopback(struct ifnet * ifp)553 in6_ifattach_loopback(
554 struct ifnet *ifp) /* must be IFT_LOOP */
555 {
556 struct in6_aliasreq ifra;
557 struct in6_ifaddr *ia;
558 int error;
559
560 bzero(&ifra, sizeof(ifra));
561
562 /*
563 * in6_update_ifa() does not use ifra_name, but we accurately set it
564 * for safety.
565 */
566 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
567
568 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
569 ifra.ifra_prefixmask.sin6_family = AF_INET6;
570 ifra.ifra_prefixmask.sin6_addr = in6mask128;
571
572 /*
573 * Always initialize ia_dstaddr (= broadcast address) to loopback
574 * address. Follows IPv4 practice - see in_ifinit().
575 */
576 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
577 ifra.ifra_dstaddr.sin6_family = AF_INET6;
578 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
579
580 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
581 ifra.ifra_addr.sin6_family = AF_INET6;
582 ifra.ifra_addr.sin6_addr = in6addr_loopback;
583
584 /* the loopback address should NEVER expire. */
585 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
586 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
587
588 /* we don't need to perform DAD on loopback interfaces. */
589 ifra.ifra_flags |= IN6_IFF_NODAD;
590
591 /* add the new interface address */
592 error = in6_update_ifa(ifp, &ifra, 0, &ia);
593 if (error != 0) {
594 nd6log(error,
595 "%s: failed to configure loopback address %s (error=%d)\n",
596 __func__, if_name(ifp), error);
597 VERIFY(ia == NULL);
598 return EADDRNOTAVAIL;
599 }
600
601 VERIFY(ia != NULL);
602 IFA_REMREF(&ia->ia_ifa);
603 return 0;
604 }
605
606 /*
607 * compute NI group address, based on the current hostname setting.
608 * see RFC 4620.
609 *
610 * when ifp == NULL, the caller is responsible for filling scopeid.
611 */
612 int
in6_nigroup(struct ifnet * ifp,const char * name,size_t namelen,struct in6_addr * in6,uint32_t * ifscopep)613 in6_nigroup(
614 struct ifnet *ifp,
615 const char *name,
616 size_t namelen,
617 struct in6_addr *in6,
618 uint32_t *ifscopep)
619 {
620 const char *p;
621 u_char *q;
622 SHA1_CTX ctxt;
623 u_int8_t digest[SHA1_RESULTLEN];
624 size_t l;
625 char n[64]; /* a single label must not exceed 63 chars */
626
627 if (!namelen || !name) {
628 return -1;
629 }
630
631 p = name;
632 while (p && *p && *p != '.' && p - name < namelen) {
633 p++;
634 }
635 if (p - name > sizeof(n) - 1) {
636 return -1; /* label too long */
637 }
638 l = p - name;
639 strlcpy(n, name, l);
640 n[(int)l] = '\0';
641 for (q = (u_char *) n; *q; q++) {
642 if ('A' <= *q && *q <= 'Z') {
643 *q = *q - 'A' + 'a';
644 }
645 }
646
647 /* generate 16 bytes of pseudo-random value. */
648 bzero(&ctxt, sizeof(ctxt));
649 SHA1Init(&ctxt);
650 SHA1Update(&ctxt, &l, sizeof(l));
651 SHA1Update(&ctxt, n, l);
652 SHA1Final(digest, &ctxt);
653
654 bzero(in6, sizeof(*in6));
655 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
656 in6->s6_addr8[11] = 2;
657 in6->s6_addr8[12] = 0xff;
658 /* copy first 3 bytes of prefix into address */
659 bcopy(digest, &in6->s6_addr8[13], 3);
660 if (in6_setscope(in6, ifp, ifscopep)) {
661 return -1; /* XXX: should not fail */
662 }
663 return 0;
664 }
665
666 int
in6_domifattach(struct ifnet * ifp)667 in6_domifattach(struct ifnet *ifp)
668 {
669 int error;
670
671 VERIFY(ifp != NULL);
672
673 error = proto_plumb(PF_INET6, ifp);
674 if (error != 0) {
675 if (error != EEXIST) {
676 log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n",
677 __func__, error, if_name(ifp));
678 }
679 } else {
680 error = in6_ifattach_prelim(ifp);
681 if (error != 0) {
682 int errorx;
683
684 log(LOG_ERR,
685 "%s: in6_ifattach_prelim returned %d if=%s%d\n",
686 __func__, error, ifp->if_name, ifp->if_unit);
687
688 errorx = proto_unplumb(PF_INET6, ifp);
689 if (errorx != 0) { /* XXX should not fail */
690 log(LOG_ERR,
691 "%s: proto_unplumb returned %d if=%s%d\n",
692 __func__, errorx, ifp->if_name,
693 ifp->if_unit);
694 }
695 }
696 }
697
698 return error;
699 }
700
701 int
in6_ifattach_prelim(struct ifnet * ifp)702 in6_ifattach_prelim(struct ifnet *ifp)
703 {
704 int error = 0;
705 struct in6_ifaddr *ia6 = NULL;
706
707 VERIFY(ifp != NULL);
708
709 /* quirks based on interface type */
710 switch (ifp->if_type) {
711 #if IFT_STF
712 case IFT_STF:
713 /*
714 * 6to4 interface is a very special kind of beast.
715 * no multicast, no linklocal. RFC2529 specifies how to make
716 * linklocals for 6to4 interface, but there's no use and
717 * it is rather harmful to have one.
718 */
719 goto skipmcast;
720 #endif
721 default:
722 break;
723 }
724
725 /*
726 * IPv6 requires multicast capability at the interface.
727 * (previously, this was a silent error.)
728 */
729 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
730 nd6log0(info, "in6_ifattach: %s is not multicast capable, IPv6 not enabled\n",
731 if_name(ifp));
732 return EINVAL;
733 }
734
735 #if IFT_STF
736 skipmcast:
737 #endif
738
739 if (ifp->if_inet6data == NULL) {
740 ifp->if_inet6data = zalloc_permanent_type(struct in6_ifextra);
741 } else {
742 /*
743 * Since the structure is never freed, we need to zero out
744 * some of its members. We avoid zeroing out the scope6
745 * structure on purpose because other threads might be
746 * using its contents.
747 */
748 bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat,
749 sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat));
750 bzero(&IN6_IFEXTRA(ifp)->in6_ifstat,
751 sizeof(IN6_IFEXTRA(ifp)->in6_ifstat));
752 /* XXX TBD Purge the layer two table */
753 /*
754 * XXX When recycling, nd_ifinfo gets initialized, other
755 * than the lock, inside nd6_ifattach
756 */
757 }
758
759 /*
760 * XXX Only initialize IPv6 configuration for the interface
761 * if interface has not yet been configured with
762 * link local IPv6 address.
763 * Could possibly be optimized with an interface flag if need
764 * be. For now using in6ifa_ifpforlinklocal.
765 */
766 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
767 if (ia6 == NULL) {
768 IN6_IFEXTRA(ifp)->netsig_len = 0;
769 bzero(&IN6_IFEXTRA(ifp)->netsig,
770 sizeof(IN6_IFEXTRA(ifp)->netsig));
771 bzero(IN6_IFEXTRA(ifp)->nat64_prefixes,
772 sizeof(IN6_IFEXTRA(ifp)->nat64_prefixes));
773 /* initialize NDP variables */
774 nd6_ifattach(ifp);
775 } else {
776 VERIFY(ND_IFINFO(ifp)->initialized);
777 IFA_REMREF(&ia6->ia_ifa);
778 ia6 = NULL;
779 }
780 scope6_ifattach(ifp);
781
782 /* initialize loopback interface address */
783 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
784 error = in6_ifattach_loopback(ifp);
785 if (error != 0) {
786 log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n",
787 __func__, error);
788 return error;
789 }
790 }
791
792 /* update dynamically. */
793 if (in6_maxmtu < ifp->if_mtu) {
794 in6_maxmtu = ifp->if_mtu;
795 }
796
797 VERIFY(error == 0);
798 return 0;
799 }
800
801 /*
802 * This routine is only meant to configure IPv6 Link Local
803 * addresses.
804 */
805 int
in6_ifattach_aliasreq(struct ifnet * ifp,struct ifnet * altifp,struct in6_aliasreq * ifra0)806 in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp,
807 struct in6_aliasreq *ifra0)
808 {
809 int error;
810 struct in6_ifaddr *ia6;
811 struct in6_aliasreq ifra;
812
813 error = in6_ifattach_prelim(ifp);
814 if (error != 0) {
815 return error;
816 }
817
818 if (!ip6_auto_linklocal) {
819 return 0;
820 }
821
822 /*
823 * Assign a link-local address, only if there isn't one here already.
824 * XXX If we ever allow more than one LLA on the interface
825 * make sure that the corresponding prefix on the prefixlist
826 * is reference counted and the address's prefix pointer
827 * points to the prefix.
828 */
829 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
830 if (ia6 != NULL) {
831 IFA_REMREF(&ia6->ia_ifa);
832 return 0;
833 }
834
835 bzero(&ifra, sizeof(ifra));
836
837 /*
838 * in6_update_ifa() does not use ifra_name, but we accurately set it
839 * for safety.
840 */
841 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
842
843 /* Initialize the IPv6 interface address in our in6_aliasreq block */
844 if (ifra0 != NULL) {
845 /* interface provided both addresses for us */
846 struct sockaddr_in6 *sin6 = &ifra.ifra_addr;
847 struct in6_addr *in6 = &sin6->sin6_addr;
848 boolean_t ok = TRUE;
849
850 bcopy(&ifra0->ifra_addr, sin6, sizeof(struct sockaddr_in6));
851
852 if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0) {
853 ok = FALSE;
854 }
855 if (ok && (in6->s6_addr16[0] != htons(0xfe80))) {
856 ok = FALSE;
857 }
858
859 if (ok) {
860 if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0) {
861 if (in6_embedded_scope) {
862 in6->s6_addr16[1] = htons(ifp->if_index);
863 } else {
864 sin6->sin6_scope_id = ifp->if_index;
865 }
866 } else if (sin6->sin6_scope_id != 0 &&
867 sin6->sin6_scope_id != ifp->if_index) {
868 ok = FALSE;
869 } else if (in6_embedded_scope && in6->s6_addr16[1] != 0 &&
870 ntohs(in6->s6_addr16[1]) != ifp->if_index) {
871 ok = FALSE;
872 }
873 }
874 if (ok && (in6->s6_addr32[1] != 0)) {
875 ok = FALSE;
876 }
877 if (!ok) {
878 return EINVAL;
879 }
880 } else {
881 ifra.ifra_addr.sin6_family = AF_INET6;
882 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
883 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
884 if (in6_embedded_scope) {
885 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
886 } else {
887 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
888 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
889 }
890 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
891 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
892 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
893 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
894 if (!in6_embedded_scope) {
895 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
896 }
897 } else {
898 if (in6_select_iid_from_all_hw(ifp, altifp,
899 &ifra.ifra_addr.sin6_addr) != 0) {
900 nd6log(error, "%s: no IID available\n",
901 if_name(ifp));
902 return EADDRNOTAVAIL;
903 }
904 }
905 }
906
907 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
908 return EADDRNOTAVAIL;
909 }
910
911 /* Set the prefix mask */
912 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
913 ifra.ifra_prefixmask.sin6_family = AF_INET6;
914 ifra.ifra_prefixmask.sin6_addr = in6mask64;
915
916 /* link-local addresses should NEVER expire. */
917 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
918 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
919
920 /* Attach the link-local address */
921 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
922 nd6log(info,
923 "%s: %s could not attach link-local address.\n",
924 __func__, if_name(ifp));
925 /* NB: not an error */
926 }
927
928 return 0;
929 }
930
931 int
in6_ifattach_llcgareq(struct ifnet * ifp,struct in6_cgareq * llcgasr)932 in6_ifattach_llcgareq(struct ifnet *ifp, struct in6_cgareq *llcgasr)
933 {
934 struct in6_aliasreq ifra;
935 struct in6_ifaddr *ia6 = NULL;
936 struct nd_ifinfo *ndi = NULL;
937 int error;
938
939 VERIFY(llcgasr != NULL);
940
941 error = in6_ifattach_prelim(ifp);
942 if (error != 0) {
943 return error;
944 }
945
946 if (!ip6_auto_linklocal) {
947 return 0;
948 }
949
950 if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED) {
951 return ENXIO;
952 }
953
954 ndi = ND_IFINFO(ifp);
955 VERIFY(ndi != NULL && ndi->initialized);
956 if ((ndi->flags & ND6_IFF_INSECURE) != 0) {
957 return ENXIO;
958 }
959
960 /*
961 * Assign a link-local address, only if there isn't one here already.
962 * XXX If we ever allow more than one LLA on the interface
963 * make sure that the corresponding prefix on the prefixlist
964 * is reference counted and the address's prefix pointer
965 * points to the prefix.
966 */
967 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
968 if (ia6 != NULL) {
969 IFA_REMREF(&ia6->ia_ifa);
970 return 0;
971 }
972
973 bzero(&ifra, sizeof(ifra));
974 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
975
976 ifra.ifra_addr.sin6_family = AF_INET6;
977 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
978 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
979 if (in6_embedded_scope) {
980 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
981 } else {
982 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
983 }
984 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
985 ifra.ifra_flags = IN6_IFF_SECURED;
986
987 in6_cga_node_lock();
988 if (in6_cga_generate(&llcgasr->cgar_cgaprep, llcgasr->cgar_collision_count,
989 &ifra.ifra_addr.sin6_addr, ifp)) {
990 in6_cga_node_unlock();
991 return EADDRNOTAVAIL;
992 }
993 in6_cga_node_unlock();
994
995 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
996 return EADDRNOTAVAIL;
997 }
998
999 /* Set the prefix mask */
1000 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1001 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1002 ifra.ifra_prefixmask.sin6_addr = in6mask64;
1003
1004 /*
1005 * link-local addresses should NEVER expire, but cryptographic
1006 * ones may have finite preferred lifetime [if it's important to
1007 * keep them from being used by applications as persistent device
1008 * identifiers].
1009 */
1010 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1011 ifra.ifra_lifetime.ia6t_pltime = llcgasr->cgar_lifetime.ia6t_pltime;
1012
1013 /* Attach the link-local address */
1014 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
1015 /* NB: not an error */
1016 nd6log(info,
1017 "%s: %s could not attach link-local address.\n",
1018 __func__, if_name(ifp));
1019 }
1020
1021 VERIFY(error == 0);
1022 return error;
1023 }
1024
1025 /*
1026 * NOTE: in6_ifdetach() does not support loopback if at this moment.
1027 */
1028 void
in6_ifdetach(struct ifnet * ifp)1029 in6_ifdetach(struct ifnet *ifp)
1030 {
1031 struct in6_ifaddr *ia, *nia;
1032 struct ifaddr *ifa;
1033 struct rtentry *rt;
1034 struct sockaddr_in6 sin6;
1035 struct in6_multi_mship *imm;
1036 int unlinked;
1037
1038 LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED);
1039
1040 /* remove neighbor management table */
1041 nd6_purge(ifp);
1042
1043 if (LLTABLE6(ifp)) {
1044 lltable_free(LLTABLE6(ifp));
1045 }
1046
1047 /* nuke any of IPv6 addresses we have */
1048 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1049 boolean_t from_begining = TRUE;
1050 while (from_begining) {
1051 from_begining = FALSE;
1052 TAILQ_FOREACH(ia, &in6_ifaddrhead, ia6_link) {
1053 if (ia->ia_ifa.ifa_ifp != ifp) {
1054 continue;
1055 }
1056 IFA_ADDREF(&ia->ia_ifa); /* for us */
1057 lck_rw_done(&in6_ifaddr_rwlock);
1058 in6_purgeaddr(&ia->ia_ifa);
1059 IFA_REMREF(&ia->ia_ifa); /* for us */
1060 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1061 /*
1062 * Purging the address caused in6_ifaddr_rwlock
1063 * to be dropped and reacquired;
1064 * therefore search again from the beginning
1065 * of in6_ifaddrs list.
1066 */
1067 from_begining = TRUE;
1068 break;
1069 }
1070 }
1071 lck_rw_done(&in6_ifaddr_rwlock);
1072
1073 ifnet_lock_exclusive(ifp);
1074
1075 /* undo everything done by in6_ifattach(), just in case */
1076 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1077 while (ifa != NULL) {
1078 IFA_LOCK(ifa);
1079 if (ifa->ifa_addr->sa_family != AF_INET6 ||
1080 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->
1081 sin6_addr)) {
1082 IFA_UNLOCK(ifa);
1083 ifa = TAILQ_NEXT(ifa, ifa_list);
1084 continue;
1085 }
1086
1087 ia = (struct in6_ifaddr *)ifa;
1088
1089 /* hold a reference for this routine */
1090 IFA_ADDREF_LOCKED(ifa);
1091 /* remove from the linked list */
1092 if_detach_ifa(ifp, ifa);
1093 IFA_UNLOCK(ifa);
1094
1095 /*
1096 * Leaving the multicast group(s) may involve freeing the
1097 * link address multicast structure(s) for the interface,
1098 * which is protected by ifnet lock. To avoid violating
1099 * lock ordering, we must drop ifnet lock before doing so.
1100 * The ifa won't go away since we held a refcnt above.
1101 */
1102 ifnet_lock_done(ifp);
1103
1104 /*
1105 * We have to do this work manually here instead of calling
1106 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag.
1107 */
1108
1109 /*
1110 * leave from multicast groups we have joined for the interface
1111 */
1112 IFA_LOCK(ifa);
1113 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1114 LIST_REMOVE(imm, i6mm_chain);
1115 IFA_UNLOCK(ifa);
1116 in6_leavegroup(imm);
1117 IFA_LOCK(ifa);
1118 }
1119
1120 /* remove from the routing table */
1121 if (ia->ia_flags & IFA_ROUTE) {
1122 IFA_UNLOCK(ifa);
1123 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0);
1124 if (rt != NULL) {
1125 (void) rtrequest(RTM_DELETE,
1126 (struct sockaddr *)&ia->ia_addr,
1127 (struct sockaddr *)&ia->ia_addr,
1128 (struct sockaddr *)&ia->ia_prefixmask,
1129 rt->rt_flags, (struct rtentry **)0);
1130 rtfree(rt);
1131 }
1132 } else {
1133 IFA_UNLOCK(ifa);
1134 }
1135
1136 /* also remove from the IPv6 address chain(itojun&jinmei) */
1137 unlinked = 0;
1138 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1139 TAILQ_FOREACH(nia, &in6_ifaddrhead, ia6_link) {
1140 if (ia == nia) {
1141 TAILQ_REMOVE(&in6_ifaddrhead, ia, ia6_link);
1142 os_atomic_inc(&in6_ifaddrlist_genid, relaxed);
1143 unlinked = 1;
1144 break;
1145 }
1146 }
1147 lck_rw_done(&in6_ifaddr_rwlock);
1148
1149 /*
1150 * release another refcnt for the link from in6_ifaddrs.
1151 * Do this only if it's not already unlinked in the event
1152 * that we lost the race, since in6_ifaddr_rwlock was
1153 * momentarily dropped above.
1154 */
1155 if (unlinked) {
1156 IFA_REMREF(ifa);
1157 }
1158 /* release reference held for this routine */
1159 IFA_REMREF(ifa);
1160
1161 /*
1162 * This is suboptimal, but since we dropped ifnet lock above
1163 * the list might have changed. Repeat the search from the
1164 * beginning until we find the first eligible IPv6 address.
1165 */
1166 ifnet_lock_exclusive(ifp);
1167 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1168 }
1169 ifnet_lock_done(ifp);
1170
1171 /* invalidate route caches */
1172 routegenid_inet6_update();
1173
1174 /*
1175 * remove neighbor management table. we call it twice just to make
1176 * sure we nuke everything. maybe we need just one call.
1177 * XXX: since the first call did not release addresses, some prefixes
1178 * might remain. We should call nd6_purge() again to release the
1179 * prefixes after removing all addresses above.
1180 * (Or can we just delay calling nd6_purge until at this point?)
1181 */
1182 nd6_purge(ifp);
1183
1184 /* remove route to link-local allnodes multicast (ff02::1) */
1185 bzero(&sin6, sizeof(sin6));
1186 sin6.sin6_len = sizeof(struct sockaddr_in6);
1187 sin6.sin6_family = AF_INET6;
1188 sin6.sin6_addr = in6addr_linklocal_allnodes;
1189 if (in6_embedded_scope) {
1190 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1191 } else {
1192 sin6.sin6_scope_id = ifp->if_index;
1193 }
1194 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
1195 if (rt != NULL) {
1196 RT_LOCK(rt);
1197 if (rt->rt_ifp == ifp) {
1198 /*
1199 * Prevent another thread from modifying rt_key,
1200 * rt_gateway via rt_setgate() after the rt_lock
1201 * is dropped by marking the route as defunct.
1202 */
1203 rt->rt_flags |= RTF_CONDEMNED;
1204 RT_UNLOCK(rt);
1205 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
1206 rt_mask(rt), rt->rt_flags, 0);
1207 } else {
1208 RT_UNLOCK(rt);
1209 }
1210 rtfree(rt);
1211 }
1212 }
1213
1214 void
in6_iid_mktmp(struct ifnet * ifp,u_int8_t * retbuf,const u_int8_t * baseid,int generate)1215 in6_iid_mktmp(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
1216 int generate)
1217 {
1218 u_int8_t nullbuf[8];
1219 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
1220
1221 VERIFY(ndi != NULL && ndi->initialized);
1222 lck_mtx_lock(&ndi->lock);
1223 bzero(nullbuf, sizeof(nullbuf));
1224 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
1225 /* we've never created a random ID. Create a new one. */
1226 generate = 1;
1227 }
1228
1229 if (generate) {
1230 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
1231
1232 /* in6_generate_tmp_iid will update seedn and buf */
1233 (void) in6_generate_tmp_iid(ndi->randomseed0, ndi->randomseed1,
1234 ndi->randomid);
1235 }
1236
1237 bcopy(ndi->randomid, retbuf, 8);
1238 lck_mtx_unlock(&ndi->lock);
1239 }
1240
1241 void
in6_tmpaddrtimer(void * arg)1242 in6_tmpaddrtimer(void *arg)
1243 {
1244 #pragma unused(arg)
1245 struct ifnet *ifp = NULL;
1246 struct nd_ifinfo *ndi = NULL;
1247 u_int8_t nullbuf[8];
1248
1249 timeout(in6_tmpaddrtimer, (caddr_t)0, (ip6_temp_preferred_lifetime -
1250 ip6_desync_factor - ip6_temp_regen_advance) * hz);
1251
1252 bzero(nullbuf, sizeof(nullbuf));
1253 ifnet_head_lock_shared();
1254 for (ifp = ifnet_head.tqh_first; ifp;
1255 ifp = ifp->if_link.tqe_next) {
1256 ndi = ND_IFINFO(ifp);
1257 if ((NULL == ndi) || (FALSE == ndi->initialized)) {
1258 continue;
1259 }
1260 lck_mtx_lock(&ndi->lock);
1261 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
1262 /*
1263 * We've been generating a random ID on this interface.
1264 * Create a new one.
1265 */
1266 (void) in6_generate_tmp_iid(ndi->randomseed0,
1267 ndi->randomseed1, ndi->randomid);
1268 }
1269 lck_mtx_unlock(&ndi->lock);
1270 }
1271 ifnet_head_done();
1272 }
1273