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 case IFT_6LOWPAN:
291 /* IEEE802/EUI64 cases - what others? */
292 /* IEEE1394 uses 16byte length address starting with EUI64 */
293 if (addrlen > 8) {
294 addrlen = 8;
295 }
296
297 /* look at IEEE802/EUI64 only */
298 if (addrlen != 8 && addrlen != 6) {
299 goto done;
300 }
301
302 /*
303 * check for invalid MAC address - on bsdi, we see it a lot
304 * since wildboar configures all-zero MAC on pccard before
305 * card insertion.
306 */
307 if (bcmp(addr, allzero, addrlen) == 0) {
308 goto done;
309 }
310 if (bcmp(addr, allone, addrlen) == 0) {
311 goto done;
312 }
313
314 /* make EUI64 address */
315 if (addrlen == 8) {
316 bcopy(addr, &in6->s6_addr[8], 8);
317 } else if (addrlen == 6) {
318 in6->s6_addr[8] = addr[0];
319 in6->s6_addr[9] = addr[1];
320 in6->s6_addr[10] = addr[2];
321 in6->s6_addr[11] = 0xff;
322 in6->s6_addr[12] = 0xfe;
323 in6->s6_addr[13] = addr[3];
324 in6->s6_addr[14] = addr[4];
325 in6->s6_addr[15] = addr[5];
326 }
327 break;
328
329 case IFT_ARCNET:
330 if (addrlen != 1) {
331 goto done;
332 }
333 if (!addr[0]) {
334 goto done;
335 }
336
337 bzero(&in6->s6_addr[8], 8);
338 in6->s6_addr[15] = addr[0];
339
340 /*
341 * due to insufficient bitwidth, we mark it local.
342 */
343 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */
344 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */
345 break;
346
347 case IFT_GIF:
348 #if IFT_STF
349 case IFT_STF:
350 #endif
351 /*
352 * RFC2893 says: "SHOULD use IPv4 address as IID source".
353 * however, IPv4 address is not very suitable as unique
354 * identifier source (can be renumbered).
355 * we don't do this.
356 */
357 goto done;
358
359 case IFT_CELLULAR:
360 goto done;
361
362 default:
363 goto done;
364 }
365
366 /* sanity check: g bit must not indicate "group" */
367 if (ND6_EUI64_GROUP(in6)) {
368 goto done;
369 }
370
371 /* convert EUI64 into IPv6 interface identifier */
372 ND6_EUI64_TO_IFID(in6);
373
374 /*
375 * sanity check: iid must not be all zero, avoid conflict with
376 * subnet router anycast
377 */
378 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 &&
379 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
380 goto done;
381 }
382
383 err = 0; /* found */
384
385 done:
386 /* This must not be the last reference to the lladdr */
387 if (IFA_REMREF_LOCKED(ifa) == NULL) {
388 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa);
389 /* NOTREACHED */
390 }
391 IFA_UNLOCK(ifa);
392 return err;
393 }
394
395 /*
396 * Get interface identifier for the specified interface using the method in
397 * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface
398 * identifier from other information sources.
399 *
400 * ifp - primary EUI64 source
401 * altifp - secondary EUI64 source
402 * in6 - IPv6 address to output IID
403 */
404 static int
in6_select_iid_from_all_hw(struct ifnet * ifp0,struct ifnet * altifp,struct in6_addr * in6)405 in6_select_iid_from_all_hw(
406 struct ifnet *ifp0,
407 struct ifnet *altifp, /* secondary EUI64 source */
408 struct in6_addr *in6)
409 {
410 struct ifnet *ifp;
411
412 /* first, try to get it from the interface itself */
413 if (in6_iid_from_hw(ifp0, in6) == 0) {
414 nd6log(debug, "%s: IID derived from HW interface.\n",
415 if_name(ifp0));
416 goto success;
417 }
418
419 /* try secondary EUI64 source. this basically is for ATM PVC */
420 if (altifp && in6_iid_from_hw(altifp, in6) == 0) {
421 nd6log(debug, "%s: IID from alterate HW interface %s.\n",
422 if_name(ifp0), if_name(altifp));
423 goto success;
424 }
425
426 /* next, try to get it from some other hardware interface */
427 ifnet_head_lock_shared();
428 TAILQ_FOREACH(ifp, &ifnet_head, if_list) {
429 if (ifp == ifp0) {
430 continue;
431 }
432 if (in6_iid_from_hw(ifp, in6) != 0) {
433 continue;
434 }
435
436 /*
437 * to borrow IID from other interface, IID needs to be
438 * globally unique
439 */
440 if (ND6_IFID_UNIVERSAL(in6)) {
441 nd6log(debug, "%s: borrowed IID from %s\n",
442 if_name(ifp0), if_name(ifp));
443 ifnet_head_done();
444 goto success;
445 }
446 }
447 ifnet_head_done();
448
449 /* last resort: get from random number source */
450 if (get_rand_iid(ifp, in6) == 0) {
451 nd6log(debug, "%s: IID from PRNG.\n", if_name(ifp0));
452 goto success;
453 }
454
455 printf("%s: failed to get interface identifier\n", if_name(ifp0));
456 return -1;
457
458 success:
459 nd6log(info, "%s: IID: "
460 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
461 if_name(ifp0),
462 in6->s6_addr[8], in6->s6_addr[9],
463 in6->s6_addr[10], in6->s6_addr[11],
464 in6->s6_addr[12], in6->s6_addr[13],
465 in6->s6_addr[14], in6->s6_addr[15]);
466 return 0;
467 }
468
469 static int
in6_ifattach_linklocal(struct ifnet * ifp,struct in6_aliasreq * ifra)470 in6_ifattach_linklocal(struct ifnet *ifp, struct in6_aliasreq *ifra)
471 {
472 struct in6_ifaddr *ia;
473 struct nd_prefix pr0, *pr;
474 int i, error;
475
476 VERIFY(ifra != NULL);
477
478 proto_plumb(PF_INET6, ifp);
479
480 error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia);
481 if (error != 0) {
482 /*
483 * XXX: When the interface does not support IPv6, this call
484 * would fail in the SIOCSIFADDR ioctl. I believe the
485 * notification is rather confusing in this case, so just
486 * suppress it. ([email protected] 20010130)
487 */
488 if (error != EAFNOSUPPORT) {
489 nd6log(info, "%s: failed to "
490 "configure a link-local address on %s "
491 "(errno=%d)\n",
492 __func__, if_name(ifp), error);
493 }
494 return EADDRNOTAVAIL;
495 }
496 VERIFY(ia != NULL);
497
498 /*
499 * Make the link-local prefix (fe80::%link/64) as on-link.
500 * Since we'd like to manage prefixes separately from addresses,
501 * we make an ND6 prefix structure for the link-local prefix,
502 * and add it to the prefix list as a never-expire prefix.
503 * XXX: this change might affect some existing code base...
504 */
505 bzero(&pr0, sizeof(pr0));
506 lck_mtx_init(&pr0.ndpr_lock, &ifa_mtx_grp, &ifa_mtx_attr);
507 pr0.ndpr_ifp = ifp;
508 /* this should be 64 at this moment. */
509 pr0.ndpr_plen = (u_char)in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL);
510 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
511 pr0.ndpr_prefix = ifra->ifra_addr;
512 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
513 for (i = 0; i < 4; i++) {
514 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
515 in6mask64.s6_addr32[i];
516 }
517 /*
518 * Initialize parameters. The link-local prefix must always be
519 * on-link, and its lifetimes never expire.
520 */
521 pr0.ndpr_raf_onlink = 1;
522 pr0.ndpr_raf_auto = 1; /* probably meaningless */
523 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
524 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
525 pr0.ndpr_stateflags |= NDPRF_STATIC;
526 /*
527 * Since there is no other link-local addresses, nd6_prefix_lookup()
528 * probably returns NULL. However, we cannot always expect the result.
529 * For example, if we first remove the (only) existing link-local
530 * address, and then reconfigure another one, the prefix is still
531 * valid with referring to the old link-local address.
532 */
533 if ((pr = nd6_prefix_lookup(&pr0, ND6_PREFIX_EXPIRY_UNSPEC)) == NULL) {
534 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) {
535 IFA_REMREF(&ia->ia_ifa);
536 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
537 return error;
538 }
539 }
540
541 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL);
542 IFA_REMREF(&ia->ia_ifa);
543
544 /* Drop use count held above during lookup/add */
545 if (pr != NULL) {
546 NDPR_REMREF(pr);
547 }
548
549 lck_mtx_destroy(&pr0.ndpr_lock, &ifa_mtx_grp);
550 return 0;
551 }
552
553 static int
in6_ifattach_loopback(struct ifnet * ifp)554 in6_ifattach_loopback(
555 struct ifnet *ifp) /* must be IFT_LOOP */
556 {
557 struct in6_aliasreq ifra;
558 struct in6_ifaddr *ia;
559 int error;
560
561 bzero(&ifra, sizeof(ifra));
562
563 /*
564 * in6_update_ifa() does not use ifra_name, but we accurately set it
565 * for safety.
566 */
567 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
568
569 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
570 ifra.ifra_prefixmask.sin6_family = AF_INET6;
571 ifra.ifra_prefixmask.sin6_addr = in6mask128;
572
573 /*
574 * Always initialize ia_dstaddr (= broadcast address) to loopback
575 * address. Follows IPv4 practice - see in_ifinit().
576 */
577 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
578 ifra.ifra_dstaddr.sin6_family = AF_INET6;
579 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
580
581 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
582 ifra.ifra_addr.sin6_family = AF_INET6;
583 ifra.ifra_addr.sin6_addr = in6addr_loopback;
584
585 /* the loopback address should NEVER expire. */
586 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
587 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
588
589 /* we don't need to perform DAD on loopback interfaces. */
590 ifra.ifra_flags |= IN6_IFF_NODAD;
591
592 /* add the new interface address */
593 error = in6_update_ifa(ifp, &ifra, 0, &ia);
594 if (error != 0) {
595 nd6log(error,
596 "%s: failed to configure loopback address %s (error=%d)\n",
597 __func__, if_name(ifp), error);
598 VERIFY(ia == NULL);
599 return EADDRNOTAVAIL;
600 }
601
602 VERIFY(ia != NULL);
603 IFA_REMREF(&ia->ia_ifa);
604 return 0;
605 }
606
607 /*
608 * compute NI group address, based on the current hostname setting.
609 * see RFC 4620.
610 *
611 * when ifp == NULL, the caller is responsible for filling scopeid.
612 */
613 int
in6_nigroup(struct ifnet * ifp,const char * name,size_t namelen,struct in6_addr * in6,uint32_t * ifscopep)614 in6_nigroup(
615 struct ifnet *ifp,
616 const char *name,
617 size_t namelen,
618 struct in6_addr *in6,
619 uint32_t *ifscopep)
620 {
621 const char *p;
622 u_char *q;
623 SHA1_CTX ctxt;
624 u_int8_t digest[SHA1_RESULTLEN];
625 size_t l;
626 char n[64]; /* a single label must not exceed 63 chars */
627
628 if (!namelen || !name) {
629 return -1;
630 }
631
632 p = name;
633 while (p && *p && *p != '.' && p - name < namelen) {
634 p++;
635 }
636 if (p - name > sizeof(n) - 1) {
637 return -1; /* label too long */
638 }
639 l = p - name;
640 strlcpy(n, name, l);
641 n[(int)l] = '\0';
642 for (q = (u_char *) n; *q; q++) {
643 if ('A' <= *q && *q <= 'Z') {
644 *q = *q - 'A' + 'a';
645 }
646 }
647
648 /* generate 16 bytes of pseudo-random value. */
649 bzero(&ctxt, sizeof(ctxt));
650 SHA1Init(&ctxt);
651 SHA1Update(&ctxt, &l, sizeof(l));
652 SHA1Update(&ctxt, n, l);
653 SHA1Final(digest, &ctxt);
654
655 bzero(in6, sizeof(*in6));
656 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
657 in6->s6_addr8[11] = 2;
658 in6->s6_addr8[12] = 0xff;
659 /* copy first 3 bytes of prefix into address */
660 bcopy(digest, &in6->s6_addr8[13], 3);
661 if (in6_setscope(in6, ifp, ifscopep)) {
662 return -1; /* XXX: should not fail */
663 }
664 return 0;
665 }
666
667 int
in6_domifattach(struct ifnet * ifp)668 in6_domifattach(struct ifnet *ifp)
669 {
670 int error;
671
672 VERIFY(ifp != NULL);
673
674 error = proto_plumb(PF_INET6, ifp);
675 if (error != 0) {
676 if (error != EEXIST) {
677 log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n",
678 __func__, error, if_name(ifp));
679 }
680 } else {
681 error = in6_ifattach_prelim(ifp);
682 if (error != 0) {
683 int errorx;
684
685 log(LOG_ERR,
686 "%s: in6_ifattach_prelim returned %d if=%s%d\n",
687 __func__, error, ifp->if_name, ifp->if_unit);
688
689 errorx = proto_unplumb(PF_INET6, ifp);
690 if (errorx != 0) { /* XXX should not fail */
691 log(LOG_ERR,
692 "%s: proto_unplumb returned %d if=%s%d\n",
693 __func__, errorx, ifp->if_name,
694 ifp->if_unit);
695 }
696 }
697 }
698
699 return error;
700 }
701
702 int
in6_ifattach_prelim(struct ifnet * ifp)703 in6_ifattach_prelim(struct ifnet *ifp)
704 {
705 int error = 0;
706 struct in6_ifaddr *ia6 = NULL;
707
708 VERIFY(ifp != NULL);
709
710 /* quirks based on interface type */
711 switch (ifp->if_type) {
712 #if IFT_STF
713 case IFT_STF:
714 /*
715 * 6to4 interface is a very special kind of beast.
716 * no multicast, no linklocal. RFC2529 specifies how to make
717 * linklocals for 6to4 interface, but there's no use and
718 * it is rather harmful to have one.
719 */
720 goto skipmcast;
721 #endif
722 default:
723 break;
724 }
725
726 /*
727 * IPv6 requires multicast capability at the interface.
728 * (previously, this was a silent error.)
729 */
730 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
731 nd6log0(info, "in6_ifattach: %s is not multicast capable, IPv6 not enabled\n",
732 if_name(ifp));
733 return EINVAL;
734 }
735
736 #if IFT_STF
737 skipmcast:
738 #endif
739
740 if (ifp->if_inet6data == NULL) {
741 ifp->if_inet6data = zalloc_permanent_type(struct in6_ifextra);
742 } else {
743 /*
744 * Since the structure is never freed, we need to zero out
745 * some of its members. We avoid zeroing out the scope6
746 * structure on purpose because other threads might be
747 * using its contents.
748 */
749 bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat,
750 sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat));
751 bzero(&IN6_IFEXTRA(ifp)->in6_ifstat,
752 sizeof(IN6_IFEXTRA(ifp)->in6_ifstat));
753 /* XXX TBD Purge the layer two table */
754 /*
755 * XXX When recycling, nd_ifinfo gets initialized, other
756 * than the lock, inside nd6_ifattach
757 */
758 }
759
760 /*
761 * XXX Only initialize IPv6 configuration for the interface
762 * if interface has not yet been configured with
763 * link local IPv6 address.
764 * Could possibly be optimized with an interface flag if need
765 * be. For now using in6ifa_ifpforlinklocal.
766 */
767 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
768 if (ia6 == NULL) {
769 IN6_IFEXTRA(ifp)->netsig_len = 0;
770 bzero(&IN6_IFEXTRA(ifp)->netsig,
771 sizeof(IN6_IFEXTRA(ifp)->netsig));
772 bzero(IN6_IFEXTRA(ifp)->nat64_prefixes,
773 sizeof(IN6_IFEXTRA(ifp)->nat64_prefixes));
774 /* initialize NDP variables */
775 nd6_ifattach(ifp);
776 } else {
777 VERIFY(ND_IFINFO(ifp)->initialized);
778 IFA_REMREF(&ia6->ia_ifa);
779 ia6 = NULL;
780 }
781 scope6_ifattach(ifp);
782
783 /* initialize loopback interface address */
784 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
785 error = in6_ifattach_loopback(ifp);
786 if (error != 0) {
787 log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n",
788 __func__, error);
789 return error;
790 }
791 }
792
793 /* update dynamically. */
794 if (in6_maxmtu < ifp->if_mtu) {
795 in6_maxmtu = ifp->if_mtu;
796 }
797
798 VERIFY(error == 0);
799 return 0;
800 }
801
802 /*
803 * This routine is only meant to configure IPv6 Link Local
804 * addresses.
805 */
806 int
in6_ifattach_aliasreq(struct ifnet * ifp,struct ifnet * altifp,struct in6_aliasreq * ifra0)807 in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp,
808 struct in6_aliasreq *ifra0)
809 {
810 int error;
811 struct in6_ifaddr *ia6;
812 struct in6_aliasreq ifra;
813
814 error = in6_ifattach_prelim(ifp);
815 if (error != 0) {
816 return error;
817 }
818
819 if (!ip6_auto_linklocal) {
820 return 0;
821 }
822
823 /*
824 * Assign a link-local address, only if there isn't one here already.
825 * XXX If we ever allow more than one LLA on the interface
826 * make sure that the corresponding prefix on the prefixlist
827 * is reference counted and the address's prefix pointer
828 * points to the prefix.
829 */
830 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
831 if (ia6 != NULL) {
832 IFA_REMREF(&ia6->ia_ifa);
833 return 0;
834 }
835
836 bzero(&ifra, sizeof(ifra));
837
838 /*
839 * in6_update_ifa() does not use ifra_name, but we accurately set it
840 * for safety.
841 */
842 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
843
844 /* Initialize the IPv6 interface address in our in6_aliasreq block */
845 if (ifra0 != NULL) {
846 /* interface provided both addresses for us */
847 struct sockaddr_in6 *sin6 = &ifra.ifra_addr;
848 struct in6_addr *in6 = &sin6->sin6_addr;
849 boolean_t ok = TRUE;
850
851 bcopy(&ifra0->ifra_addr, sin6, sizeof(struct sockaddr_in6));
852
853 if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0) {
854 ok = FALSE;
855 }
856 if (ok && (in6->s6_addr16[0] != htons(0xfe80))) {
857 ok = FALSE;
858 }
859
860 if (ok) {
861 if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0) {
862 if (in6_embedded_scope) {
863 in6->s6_addr16[1] = htons(ifp->if_index);
864 } else {
865 sin6->sin6_scope_id = ifp->if_index;
866 }
867 } else if (sin6->sin6_scope_id != 0 &&
868 sin6->sin6_scope_id != ifp->if_index) {
869 ok = FALSE;
870 } else if (in6_embedded_scope && in6->s6_addr16[1] != 0 &&
871 ntohs(in6->s6_addr16[1]) != ifp->if_index) {
872 ok = FALSE;
873 }
874 }
875 if (ok && (in6->s6_addr32[1] != 0)) {
876 ok = FALSE;
877 }
878 if (!ok) {
879 return EINVAL;
880 }
881 } else {
882 ifra.ifra_addr.sin6_family = AF_INET6;
883 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
884 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
885 if (in6_embedded_scope) {
886 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
887 } else {
888 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
889 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
890 }
891 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
892 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
893 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
894 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
895 if (!in6_embedded_scope) {
896 ifra.ifra_addr.sin6_scope_id = ifp->if_index;
897 }
898 } else {
899 if (in6_select_iid_from_all_hw(ifp, altifp,
900 &ifra.ifra_addr.sin6_addr) != 0) {
901 nd6log(error, "%s: no IID available\n",
902 if_name(ifp));
903 return EADDRNOTAVAIL;
904 }
905 }
906 }
907
908 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
909 return EADDRNOTAVAIL;
910 }
911
912 /* Set the prefix mask */
913 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
914 ifra.ifra_prefixmask.sin6_family = AF_INET6;
915 ifra.ifra_prefixmask.sin6_addr = in6mask64;
916
917 /* link-local addresses should NEVER expire. */
918 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
919 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
920
921 /* Attach the link-local address */
922 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
923 nd6log(info,
924 "%s: %s could not attach link-local address.\n",
925 __func__, if_name(ifp));
926 /* NB: not an error */
927 }
928
929 return 0;
930 }
931
932 int
in6_ifattach_llcgareq(struct ifnet * ifp,struct in6_cgareq * llcgasr)933 in6_ifattach_llcgareq(struct ifnet *ifp, struct in6_cgareq *llcgasr)
934 {
935 struct in6_aliasreq ifra;
936 struct in6_ifaddr *ia6 = NULL;
937 struct nd_ifinfo *ndi = NULL;
938 int error;
939
940 VERIFY(llcgasr != NULL);
941
942 error = in6_ifattach_prelim(ifp);
943 if (error != 0) {
944 return error;
945 }
946
947 if (!ip6_auto_linklocal) {
948 return 0;
949 }
950
951 if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED) {
952 return ENXIO;
953 }
954
955 ndi = ND_IFINFO(ifp);
956 VERIFY(ndi != NULL && ndi->initialized);
957 if ((ndi->flags & ND6_IFF_INSECURE) != 0) {
958 return ENXIO;
959 }
960
961 /*
962 * Assign a link-local address, only if there isn't one here already.
963 * XXX If we ever allow more than one LLA on the interface
964 * make sure that the corresponding prefix on the prefixlist
965 * is reference counted and the address's prefix pointer
966 * points to the prefix.
967 */
968 ia6 = in6ifa_ifpforlinklocal(ifp, 0);
969 if (ia6 != NULL) {
970 IFA_REMREF(&ia6->ia_ifa);
971 return 0;
972 }
973
974 bzero(&ifra, sizeof(ifra));
975 strlcpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
976
977 ifra.ifra_addr.sin6_family = AF_INET6;
978 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
979 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
980 if (in6_embedded_scope) {
981 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
982 } else {
983 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0;
984 }
985 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
986 ifra.ifra_flags = IN6_IFF_SECURED;
987
988 in6_cga_node_lock();
989 if (in6_cga_generate(&llcgasr->cgar_cgaprep, llcgasr->cgar_collision_count,
990 &ifra.ifra_addr.sin6_addr, ifp)) {
991 in6_cga_node_unlock();
992 return EADDRNOTAVAIL;
993 }
994 in6_cga_node_unlock();
995
996 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&ifra.ifra_addr.sin6_scope_id))) {
997 return EADDRNOTAVAIL;
998 }
999
1000 /* Set the prefix mask */
1001 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1002 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1003 ifra.ifra_prefixmask.sin6_addr = in6mask64;
1004
1005 /*
1006 * link-local addresses should NEVER expire, but cryptographic
1007 * ones may have finite preferred lifetime [if it's important to
1008 * keep them from being used by applications as persistent device
1009 * identifiers].
1010 */
1011 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1012 ifra.ifra_lifetime.ia6t_pltime = llcgasr->cgar_lifetime.ia6t_pltime;
1013
1014 /* Attach the link-local address */
1015 if (in6_ifattach_linklocal(ifp, &ifra) != 0) {
1016 /* NB: not an error */
1017 nd6log(info,
1018 "%s: %s could not attach link-local address.\n",
1019 __func__, if_name(ifp));
1020 }
1021
1022 VERIFY(error == 0);
1023 return error;
1024 }
1025
1026 /*
1027 * NOTE: in6_ifdetach() does not support loopback if at this moment.
1028 */
1029 void
in6_ifdetach(struct ifnet * ifp)1030 in6_ifdetach(struct ifnet *ifp)
1031 {
1032 struct in6_ifaddr *ia, *nia;
1033 struct ifaddr *ifa;
1034 struct rtentry *rt;
1035 struct sockaddr_in6 sin6;
1036 struct in6_multi_mship *imm;
1037 int unlinked;
1038
1039 LCK_MTX_ASSERT(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED);
1040
1041 /* remove neighbor management table */
1042 nd6_purge(ifp);
1043
1044 if (LLTABLE6(ifp)) {
1045 lltable_free(LLTABLE6(ifp));
1046 }
1047
1048 /* nuke any of IPv6 addresses we have */
1049 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1050 boolean_t from_begining = TRUE;
1051 while (from_begining) {
1052 from_begining = FALSE;
1053 TAILQ_FOREACH(ia, &in6_ifaddrhead, ia6_link) {
1054 if (ia->ia_ifa.ifa_ifp != ifp) {
1055 continue;
1056 }
1057 IFA_ADDREF(&ia->ia_ifa); /* for us */
1058 lck_rw_done(&in6_ifaddr_rwlock);
1059 in6_purgeaddr(&ia->ia_ifa);
1060 IFA_REMREF(&ia->ia_ifa); /* for us */
1061 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1062 /*
1063 * Purging the address caused in6_ifaddr_rwlock
1064 * to be dropped and reacquired;
1065 * therefore search again from the beginning
1066 * of in6_ifaddrs list.
1067 */
1068 from_begining = TRUE;
1069 break;
1070 }
1071 }
1072 lck_rw_done(&in6_ifaddr_rwlock);
1073
1074 ifnet_lock_exclusive(ifp);
1075
1076 /* undo everything done by in6_ifattach(), just in case */
1077 ifa = TAILQ_FIRST(&ifp->if_addrlist);
1078 while (ifa != NULL) {
1079 IFA_LOCK(ifa);
1080 if (ifa->ifa_addr->sa_family != AF_INET6 ||
1081 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->
1082 sin6_addr)) {
1083 IFA_UNLOCK(ifa);
1084 ifa = TAILQ_NEXT(ifa, ifa_list);
1085 continue;
1086 }
1087
1088 ia = (struct in6_ifaddr *)ifa;
1089
1090 /* hold a reference for this routine */
1091 IFA_ADDREF_LOCKED(ifa);
1092 /* remove from the linked list */
1093 if_detach_ifa(ifp, ifa);
1094 IFA_UNLOCK(ifa);
1095
1096 /*
1097 * Leaving the multicast group(s) may involve freeing the
1098 * link address multicast structure(s) for the interface,
1099 * which is protected by ifnet lock. To avoid violating
1100 * lock ordering, we must drop ifnet lock before doing so.
1101 * The ifa won't go away since we held a refcnt above.
1102 */
1103 ifnet_lock_done(ifp);
1104
1105 /*
1106 * We have to do this work manually here instead of calling
1107 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag.
1108 */
1109
1110 /*
1111 * leave from multicast groups we have joined for the interface
1112 */
1113 IFA_LOCK(ifa);
1114 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1115 LIST_REMOVE(imm, i6mm_chain);
1116 IFA_UNLOCK(ifa);
1117 in6_leavegroup(imm);
1118 IFA_LOCK(ifa);
1119 }
1120
1121 /* remove from the routing table */
1122 if (ia->ia_flags & IFA_ROUTE) {
1123 IFA_UNLOCK(ifa);
1124 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0);
1125 if (rt != NULL) {
1126 (void) rtrequest(RTM_DELETE,
1127 (struct sockaddr *)&ia->ia_addr,
1128 (struct sockaddr *)&ia->ia_addr,
1129 (struct sockaddr *)&ia->ia_prefixmask,
1130 rt->rt_flags, (struct rtentry **)0);
1131 rtfree(rt);
1132 }
1133 } else {
1134 IFA_UNLOCK(ifa);
1135 }
1136
1137 /* also remove from the IPv6 address chain(itojun&jinmei) */
1138 unlinked = 0;
1139 lck_rw_lock_exclusive(&in6_ifaddr_rwlock);
1140 TAILQ_FOREACH(nia, &in6_ifaddrhead, ia6_link) {
1141 if (ia == nia) {
1142 TAILQ_REMOVE(&in6_ifaddrhead, ia, ia6_link);
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