1 /* $NetBSD: in6_ifattach.c,v 1.68 2006/11/20 04:16:27 dyoung Exp $ */
2 /* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.68 2006/11/20 04:16:27 dyoung Exp $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
39 #include <sys/socket.h>
40 #include <sys/sockio.h>
41 #include <sys/kernel.h>
42 #include <sys/syslog.h>
43 #include <sys/md5.h>
44
45 #include <net/if.h>
46 #include <net/if_dl.h>
47 #include <net/if_types.h>
48 #include <net/route.h>
49
50 #include <netinet/in.h>
51 #include <netinet/in_var.h>
52
53 #include <netinet/ip6.h>
54 #include <netinet6/in6_ifattach.h>
55 #include <netinet6/ip6_var.h>
56 #include <netinet6/nd6.h>
57 #include <netinet6/ip6_mroute.h>
58 #include <netinet6/scope6_var.h>
59
60 #include <net/net_osdep.h>
61
62 unsigned long in6_maxmtu = 0;
63
64 int ip6_auto_linklocal = 1; /* enable by default */
65
66 struct callout in6_tmpaddrtimer_ch = CALLOUT_INITIALIZER;
67
68
69 #if 0
70 static int get_hostid_ifid __P((struct ifnet *, struct in6_addr *));
71 #endif
72 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
73 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *));
74 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
75 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *));
76 static int in6_ifattach_loopback __P((struct ifnet *));
77
78 #define EUI64_GBIT 0x01
79 #define EUI64_UBIT 0x02
80 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0)
81 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
82 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
83 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
84 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
85
86 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
87 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
88
89 #define GEN_TEMPID_RETRY_MAX 5
90
91 #if 0
92 /*
93 * Generate a last-resort interface identifier from hostid.
94 * works only for certain architectures (like sparc).
95 * also, using hostid itself may constitute a privacy threat, much worse
96 * than MAC addresses (hostids are used for software licensing).
97 * maybe we should use MD5(hostid) instead.
98 */
99 static int
100 get_hostid_ifid(ifp, in6)
101 struct ifnet *ifp;
102 struct in6_addr *in6; /* upper 64bits are preserved */
103 {
104 int off, len;
105 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
106 static const uint8_t allone[8] =
107 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
108
109 if (!hostid)
110 return -1;
111
112 /* get up to 8 bytes from the hostid field - should we get */
113 len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid);
114 off = sizeof(*in6) - len;
115 memcpy(&in6->s6_addr[off], &hostid, len);
116
117 /* make sure we do not return anything bogus */
118 if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero)))
119 return -1;
120 if (memcmp(&in6->s6_addr[8], allone, sizeof(allone)))
121 return -1;
122
123 /* make sure to set "u" bit to local, and "g" bit to individual. */
124 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
125 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
126
127 /* convert EUI64 into IPv6 interface identifier */
128 EUI64_TO_IFID(in6);
129
130 return 0;
131 }
132 #endif
133
134 /*
135 * Generate a last-resort interface identifier, when the machine has no
136 * IEEE802/EUI64 address sources.
137 * The goal here is to get an interface identifier that is
138 * (1) random enough and (2) does not change across reboot.
139 * We currently use MD5(hostname) for it.
140 */
141 static int
142 get_rand_ifid(struct ifnet *ifp,
143 struct in6_addr *in6) /* upper 64bits are preserved */
144 {
145 MD5_CTX ctxt;
146 u_int8_t digest[16];
147
148 #if 0
149 /* we need at least several letters as seed for ifid */
150 if (hostnamelen < 3)
151 return -1;
152 #endif
153
154 /* generate 8 bytes of pseudo-random value. */
155 memset(&ctxt, 0, sizeof(ctxt));
156 MD5Init(&ctxt);
157 MD5Update(&ctxt, (u_char *)hostname, hostnamelen);
158 MD5Final(digest, &ctxt);
159
160 /* assumes sizeof(digest) > sizeof(ifid) */
161 memcpy(&in6->s6_addr[8], digest, 8);
162
163 /* make sure to set "u" bit to local, and "g" bit to individual. */
164 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
165 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
166
167 /* convert EUI64 into IPv6 interface identifier */
168 EUI64_TO_IFID(in6);
169
170 return 0;
171 }
172
173 static int
174 generate_tmp_ifid(seed0, seed1, ret)
175 u_int8_t *seed0, *ret;
176 const u_int8_t *seed1;
177 {
178 MD5_CTX ctxt;
179 u_int8_t seed[16], digest[16], nullbuf[8];
180 u_int32_t val32;
181 /*
182 * interface ID for subnet anycast addresses.
183 * XXX: we assume the unicast address range that requires IDs
184 * in EUI-64 format.
185 */
186 static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff,
187 0xff, 0xff, 0xff, 0x80 };
188 static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe };
189 int badid, retry = 0;
190
191 /* If there's no hisotry, start with a random seed. */
192 memset(nullbuf, 0, sizeof(nullbuf));
193 if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
194 int i;
195
196 for (i = 0; i < 2; i++) {
197 val32 = arc4random();
198 memcpy(seed + sizeof(val32) * i, &val32, sizeof(val32));
199 }
200 } else
201 memcpy(seed, seed0, 8);
202
203 /* copy the right-most 64-bits of the given address */
204 /* XXX assumption on the size of IFID */
205 memcpy(&seed[8], seed1, 8);
206
207 again:
208 /* for debugging purposes only */
209 #if 0
210 {
211 int i;
212
213 printf("generate_tmp_ifid: new randomized ID from: ");
214 for (i = 0; i < 16; i++)
215 printf("%02x", seed[i]);
216 printf(" ");
217 }
218 #endif
219
220 /* generate 16 bytes of pseudo-random value. */
221 memset(&ctxt, 0, sizeof(ctxt));
222 MD5Init(&ctxt);
223 MD5Update(&ctxt, seed, sizeof(seed));
224 MD5Final(digest, &ctxt);
225
226 /*
227 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3)
228 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
229 * left-most bit is numbered 0) to zero.
230 */
231 memcpy(ret, digest, 8);
232 ret[0] &= ~EUI64_UBIT;
233
234 /*
235 * Reject inappropriate identifiers according to
236 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4)
237 * At this moment, we reject following cases:
238 * - all 0 identifier
239 * - identifiers that conflict with reserved subnet anycast addresses,
240 * which are defined in RFC 2526.
241 * - identifiers that conflict with ISATAP addresses
242 * - identifiers used in our own addresses
243 */
244 badid = 0;
245 if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0)
246 badid = 1;
247 else if (memcmp(anycast_id, ret, 7) == 0 &&
248 (anycast_id[7] & ret[7]) == anycast_id[7]) {
249 badid = 1;
250 } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0)
251 badid = 1;
252 else {
253 struct in6_ifaddr *ia;
254
255 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
256 if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8],
257 ret, 8)) {
258 badid = 1;
259 break;
260 }
261 }
262 }
263
264 /*
265 * In the event that an unacceptable identifier has been generated,
266 * restart the process, using the right-most 64 bits of the MD5 digest
267 * obtained in place of the history value.
268 */
269 if (badid) {
270 /* for debugging purposes only */
271 #if 0
272 {
273 int i;
274
275 printf("unacceptable random ID: ");
276 for (i = 0; i < 16; i++)
277 printf("%02x", digest[i]);
278 printf("\n");
279 }
280 #endif
281
282 if (++retry < GEN_TEMPID_RETRY_MAX) {
283 memcpy(seed, &digest[8], 8);
284 goto again;
285 } else {
286 /*
287 * We're so unlucky. Give up for now, and return
288 * all 0 IDs to tell the caller not to make a
289 * temporary address.
290 */
291 nd6log((LOG_NOTICE,
292 "generate_tmp_ifid: never found a good ID\n"));
293 memset(ret, 0, 8);
294 }
295 }
296
297 /*
298 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6)
299 * Take the rightmost 64-bits of the MD5 digest and save them in
300 * stable storage as the history value to be used in the next
301 * iteration of the algorithm.
302 */
303 memcpy(seed0, &digest[8], 8);
304
305 /* for debugging purposes only */
306 #if 0
307 {
308 int i;
309
310 printf("to: ");
311 for (i = 0; i < 16; i++)
312 printf("%02x", digest[i]);
313 printf("\n");
314 }
315 #endif
316
317 return 0;
318 }
319 /*
320 * Get interface identifier for the specified interface.
321 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
322 */
323 int
324 in6_get_hw_ifid(ifp, in6)
325 struct ifnet *ifp;
326 struct in6_addr *in6; /* upper 64bits are preserved */
327 {
328 struct ifaddr *ifa;
329 struct sockaddr_dl *sdl;
330 char *addr;
331 size_t addrlen;
332 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
333 static u_int8_t allone[8] =
334 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
335
336 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
337 if (ifa->ifa_addr->sa_family != AF_LINK)
338 continue;
339 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
340 if (sdl == NULL)
341 continue;
342 if (sdl->sdl_alen == 0)
343 continue;
344
345 goto found;
346 }
347
348 return -1;
349
350 found:
351 addr = LLADDR(sdl);
352 addrlen = sdl->sdl_alen;
353
354 switch (ifp->if_type) {
355 case IFT_IEEE1394:
356 case IFT_IEEE80211:
357 /* IEEE1394 uses 16byte length address starting with EUI64 */
358 if (addrlen > 8)
359 addrlen = 8;
360 break;
361 default:
362 break;
363 }
364
365 /* get EUI64 */
366 switch (ifp->if_type) {
367 /* IEEE802/EUI64 cases - what others? */
368 case IFT_ETHER:
369 case IFT_FDDI:
370 case IFT_ATM:
371 case IFT_IEEE1394:
372 case IFT_IEEE80211:
373 /* look at IEEE802/EUI64 only */
374 if (addrlen != 8 && addrlen != 6)
375 return -1;
376
377 /*
378 * check for invalid MAC address - on bsdi, we see it a lot
379 * since wildboar configures all-zero MAC on pccard before
380 * card insertion.
381 */
382 if (memcmp(addr, allzero, addrlen) == 0)
383 return -1;
384 if (memcmp(addr, allone, addrlen) == 0)
385 return -1;
386
387 /* make EUI64 address */
388 if (addrlen == 8)
389 memcpy(&in6->s6_addr[8], addr, 8);
390 else if (addrlen == 6) {
391 in6->s6_addr[8] = addr[0];
392 in6->s6_addr[9] = addr[1];
393 in6->s6_addr[10] = addr[2];
394 in6->s6_addr[11] = 0xff;
395 in6->s6_addr[12] = 0xfe;
396 in6->s6_addr[13] = addr[3];
397 in6->s6_addr[14] = addr[4];
398 in6->s6_addr[15] = addr[5];
399 }
400 break;
401
402 case IFT_ARCNET:
403 if (addrlen != 1)
404 return -1;
405 if (!addr[0])
406 return -1;
407
408 memset(&in6->s6_addr[8], 0, 8);
409 in6->s6_addr[15] = addr[0];
410
411 /*
412 * due to insufficient bitwidth, we mark it local.
413 */
414 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
415 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
416 break;
417
418 case IFT_GIF:
419 #ifdef IFT_STF
420 case IFT_STF:
421 #endif
422 /*
423 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
424 * however, IPv4 address is not very suitable as unique
425 * identifier source (can be renumbered).
426 * we don't do this.
427 */
428 return -1;
429
430 default:
431 return -1;
432 }
433
434 /* sanity check: g bit must not indicate "group" */
435 if (EUI64_GROUP(in6))
436 return -1;
437
438 /* convert EUI64 into IPv6 interface identifier */
439 EUI64_TO_IFID(in6);
440
441 /*
442 * sanity check: ifid must not be all zero, avoid conflict with
443 * subnet router anycast
444 */
445 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
446 memcmp(&in6->s6_addr[9], allzero, 7) == 0) {
447 return -1;
448 }
449
450 return 0;
451 }
452
453 /*
454 * Get interface identifier for the specified interface. If it is not
455 * available on ifp0, borrow interface identifier from other information
456 * sources.
457 */
458 static int
459 get_ifid(ifp0, altifp, in6)
460 struct ifnet *ifp0;
461 struct ifnet *altifp; /*secondary EUI64 source*/
462 struct in6_addr *in6;
463 {
464 struct ifnet *ifp;
465
466 /* first, try to get it from the interface itself */
467 if (in6_get_hw_ifid(ifp0, in6) == 0) {
468 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
469 if_name(ifp0)));
470 goto success;
471 }
472
473 /* try secondary EUI64 source. this basically is for ATM PVC */
474 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
475 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
476 if_name(ifp0), if_name(altifp)));
477 goto success;
478 }
479
480 /* next, try to get it from some other hardware interface */
481 TAILQ_FOREACH(ifp, &ifnet, if_list) {
482 if (ifp == ifp0)
483 continue;
484 if (in6_get_hw_ifid(ifp, in6) != 0)
485 continue;
486
487 /*
488 * to borrow ifid from other interface, ifid needs to be
489 * globally unique
490 */
491 if (IFID_UNIVERSAL(in6)) {
492 nd6log((LOG_DEBUG,
493 "%s: borrow interface identifier from %s\n",
494 if_name(ifp0), if_name(ifp)));
495 goto success;
496 }
497 }
498
499 #if 0
500 /* get from hostid - only for certain architectures */
501 if (get_hostid_ifid(ifp, in6) == 0) {
502 nd6log((LOG_DEBUG,
503 "%s: interface identifier generated by hostid\n",
504 if_name(ifp0)));
505 goto success;
506 }
507 #endif
508
509 /* last resort: get from random number source */
510 if (get_rand_ifid(ifp, in6) == 0) {
511 nd6log((LOG_DEBUG,
512 "%s: interface identifier generated by random number\n",
513 if_name(ifp0)));
514 goto success;
515 }
516
517 printf("%s: failed to get interface identifier\n", if_name(ifp0));
518 return -1;
519
520 success:
521 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
522 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
523 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
524 in6->s6_addr[14], in6->s6_addr[15]));
525 return 0;
526 }
527
528 static int
529 in6_ifattach_linklocal(ifp, altifp)
530 struct ifnet *ifp;
531 struct ifnet *altifp; /*secondary EUI64 source*/
532 {
533 struct in6_ifaddr *ia;
534 struct in6_aliasreq ifra;
535 struct nd_prefixctl pr0;
536 int i, error;
537
538 /*
539 * configure link-local address.
540 */
541 memset(&ifra, 0, sizeof(ifra));
542
543 /*
544 * in6_update_ifa() does not use ifra_name, but we accurately set it
545 * for safety.
546 */
547 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
548
549 ifra.ifra_addr.sin6_family = AF_INET6;
550 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
551 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
552 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
553 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
554 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
555 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
556 } else {
557 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
558 nd6log((LOG_ERR,
559 "%s: no ifid available\n", if_name(ifp)));
560 return (-1);
561 }
562 }
563 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
564 return (-1);
565
566 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
567 ifra.ifra_prefixmask.sin6_family = AF_INET6;
568 ifra.ifra_prefixmask.sin6_addr = in6mask64;
569 /* link-local addresses should NEVER expire. */
570 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
571 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
572
573 /*
574 * Now call in6_update_ifa() to do a bunch of procedures to configure
575 * a link-local address. We can set NULL to the 3rd argument, because
576 * we know there's no other link-local address on the interface
577 * and therefore we are adding one (instead of updating one).
578 */
579 if ((error = in6_update_ifa(ifp, &ifra, NULL,
580 IN6_IFAUPDATE_DADDELAY)) != 0) {
581 /*
582 * XXX: When the interface does not support IPv6, this call
583 * would fail in the SIOCSIFADDR ioctl. I believe the
584 * notification is rather confusing in this case, so just
585 * suppress it. (jinmei@kame.net 20010130)
586 */
587 if (error != EAFNOSUPPORT)
588 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
589 "configure a link-local address on %s "
590 "(errno=%d)\n",
591 if_name(ifp), error));
592 return (-1);
593 }
594
595 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
596 #ifdef DIAGNOSTIC
597 if (!ia) {
598 panic("ia == NULL in in6_ifattach_linklocal");
599 /* NOTREACHED */
600 }
601 #endif
602
603 /*
604 * Make the link-local prefix (fe80::/64%link) as on-link.
605 * Since we'd like to manage prefixes separately from addresses,
606 * we make an ND6 prefix structure for the link-local prefix,
607 * and add it to the prefix list as a never-expire prefix.
608 * XXX: this change might affect some existing code base...
609 */
610 memset(&pr0, 0, sizeof(pr0));
611 pr0.ndpr_ifp = ifp;
612 /* this should be 64 at this moment. */
613 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
614 pr0.ndpr_prefix = ifra.ifra_addr;
615 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
616 for (i = 0; i < 4; i++) {
617 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
618 in6mask64.s6_addr32[i];
619 }
620 /*
621 * Initialize parameters. The link-local prefix must always be
622 * on-link, and its lifetimes never expire.
623 */
624 pr0.ndpr_raf_onlink = 1;
625 pr0.ndpr_raf_auto = 1; /* probably meaningless */
626 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
627 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
628 /*
629 * Since there is no other link-local addresses, nd6_prefix_lookup()
630 * probably returns NULL. However, we cannot always expect the result.
631 * For example, if we first remove the (only) existing link-local
632 * address, and then reconfigure another one, the prefix is still
633 * valid with referring to the old link-local address.
634 */
635 if (nd6_prefix_lookup(&pr0) == NULL) {
636 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
637 return (error);
638 }
639
640 return 0;
641 }
642
643 static int
644 in6_ifattach_loopback(ifp)
645 struct ifnet *ifp; /* must be IFT_LOOP */
646 {
647 struct in6_aliasreq ifra;
648 int error;
649
650 memset(&ifra, 0, sizeof(ifra));
651
652 /*
653 * in6_update_ifa() does not use ifra_name, but we accurately set it
654 * for safety.
655 */
656 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
657
658 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
659 ifra.ifra_prefixmask.sin6_family = AF_INET6;
660 ifra.ifra_prefixmask.sin6_addr = in6mask128;
661
662 /*
663 * Always initialize ia_dstaddr (= broadcast address) to loopback
664 * address. Follows IPv4 practice - see in_ifinit().
665 */
666 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
667 ifra.ifra_dstaddr.sin6_family = AF_INET6;
668 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
669
670 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
671 ifra.ifra_addr.sin6_family = AF_INET6;
672 ifra.ifra_addr.sin6_addr = in6addr_loopback;
673
674 /* the loopback address should NEVER expire. */
675 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
676 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
677
678 /* we don't need to perform DAD on loopback interfaces. */
679 ifra.ifra_flags |= IN6_IFF_NODAD;
680
681 /*
682 * We are sure that this is a newly assigned address, so we can set
683 * NULL to the 3rd arg.
684 */
685 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
686 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
687 "the loopback address on %s (errno=%d)\n",
688 if_name(ifp), error));
689 return (-1);
690 }
691
692 return 0;
693 }
694
695 /*
696 * compute NI group address, based on the current hostname setting.
697 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
698 *
699 * when ifp == NULL, the caller is responsible for filling scopeid.
700 */
701 int
702 in6_nigroup(ifp, name, namelen, sa6)
703 struct ifnet *ifp;
704 const char *name;
705 int namelen;
706 struct sockaddr_in6 *sa6;
707 {
708 const char *p;
709 u_int8_t *q;
710 MD5_CTX ctxt;
711 u_int8_t digest[16];
712 u_int8_t l;
713 u_int8_t n[64]; /* a single label must not exceed 63 chars */
714
715 if (!namelen || !name)
716 return -1;
717
718 p = name;
719 while (p && *p && *p != '.' && p - name < namelen)
720 p++;
721 if (p - name > sizeof(n) - 1)
722 return -1; /* label too long */
723 l = p - name;
724 strncpy((char *)n, name, l);
725 n[(int)l] = '\0';
726 for (q = n; *q; q++) {
727 if ('A' <= *q && *q <= 'Z')
728 *q = *q - 'A' + 'a';
729 }
730
731 /* generate 8 bytes of pseudo-random value. */
732 memset(&ctxt, 0, sizeof(ctxt));
733 MD5Init(&ctxt);
734 MD5Update(&ctxt, &l, sizeof(l));
735 MD5Update(&ctxt, n, l);
736 MD5Final(digest, &ctxt);
737
738 memset(sa6, 0, sizeof(*sa6));
739 sa6->sin6_family = AF_INET6;
740 sa6->sin6_len = sizeof(*sa6);
741 sa6->sin6_addr.s6_addr16[0] = htons(0xff02);
742 sa6->sin6_addr.s6_addr8[11] = 2;
743 memcpy(&sa6->sin6_addr.s6_addr32[3], digest,
744 sizeof(sa6->sin6_addr.s6_addr32[3]));
745 if (in6_setscope(&sa6->sin6_addr, ifp, NULL))
746 return (-1); /* XXX: should not fail */
747
748 return 0;
749 }
750
751 /*
752 * XXX multiple loopback interface needs more care. for instance,
753 * nodelocal address needs to be configured onto only one of them.
754 * XXX multiple link-local address case
755 */
756 void
757 in6_ifattach(ifp, altifp)
758 struct ifnet *ifp;
759 struct ifnet *altifp; /* secondary EUI64 source */
760 {
761 struct in6_ifaddr *ia;
762 struct in6_addr in6;
763
764 /* some of the interfaces are inherently not IPv6 capable */
765 switch (ifp->if_type) {
766 case IFT_BRIDGE:
767 #ifdef IFT_PFLOG
768 case IFT_PFLOG:
769 #endif
770 #ifdef IFT_PFSYNC
771 case IFT_PFSYNC:
772 #endif
773 return;
774 }
775
776 /*
777 * if link mtu is too small, don't try to configure IPv6.
778 * remember there could be some link-layer that has special
779 * fragmentation logic.
780 */
781 if (ifp->if_mtu < IPV6_MMTU) {
782 nd6log((LOG_INFO, "in6_ifattach: "
783 "%s has too small MTU, IPv6 not enabled\n",
784 if_name(ifp)));
785 return;
786 }
787
788 /* create a multicast kludge storage (if we have not had one) */
789 in6_createmkludge(ifp);
790
791 /*
792 * quirks based on interface type
793 */
794 switch (ifp->if_type) {
795 #ifdef IFT_STF
796 case IFT_STF:
797 /*
798 * 6to4 interface is a very special kind of beast.
799 * no multicast, no linklocal. RFC2529 specifies how to make
800 * linklocals for 6to4 interface, but there's no use and
801 * it is rather harmful to have one.
802 */
803 return;
804 #endif
805 case IFT_CARP:
806 return;
807 default:
808 break;
809 }
810
811 /*
812 * usually, we require multicast capability to the interface
813 */
814 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
815 nd6log((LOG_INFO, "in6_ifattach: "
816 "%s is not multicast capable, IPv6 not enabled\n",
817 if_name(ifp)));
818 return;
819 }
820
821 /*
822 * assign loopback address for loopback interface.
823 * XXX multiple loopback interface case.
824 */
825 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
826 in6 = in6addr_loopback;
827 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
828 if (in6_ifattach_loopback(ifp) != 0)
829 return;
830 }
831 }
832
833 /*
834 * assign a link-local address, if there's none.
835 */
836 if (ip6_auto_linklocal) {
837 ia = in6ifa_ifpforlinklocal(ifp, 0);
838 if (ia == NULL) {
839 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
840 /* linklocal address assigned */
841 } else {
842 /* failed to assign linklocal address. bark? */
843 }
844 }
845 }
846 }
847
848 /*
849 * NOTE: in6_ifdetach() does not support loopback if at this moment.
850 * We don't need this function in bsdi, because interfaces are never removed
851 * from the ifnet list in bsdi.
852 */
853 void
854 in6_ifdetach(ifp)
855 struct ifnet *ifp;
856 {
857 struct in6_ifaddr *ia, *oia;
858 struct ifaddr *ifa, *next;
859 struct rtentry *rt;
860 short rtflags;
861 struct in6_multi_mship *imm;
862
863 /* remove ip6_mrouter stuff */
864 ip6_mrouter_detach(ifp);
865
866 /* remove neighbor management table */
867 nd6_purge(ifp);
868
869 /* nuke any of IPv6 addresses we have */
870 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) {
871 next = TAILQ_NEXT(ifa, ifa_list);
872 if (ifa->ifa_addr->sa_family != AF_INET6)
873 continue;
874 in6_purgeaddr(ifa);
875 }
876
877 /* undo everything done by in6_ifattach(), just in case */
878 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa; ifa = next) {
879 next = TAILQ_NEXT(ifa, ifa_list);
880
881 if (ifa->ifa_addr->sa_family != AF_INET6
882 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
883 continue;
884 }
885
886 ia = (struct in6_ifaddr *)ifa;
887
888 /*
889 * leave from multicast groups we have joined for the interface
890 */
891 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
892 LIST_REMOVE(imm, i6mm_chain);
893 in6_leavegroup(imm);
894 }
895
896 /* remove from the routing table */
897 if ((ia->ia_flags & IFA_ROUTE) &&
898 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) {
899 rtflags = rt->rt_flags;
900 rtfree(rt);
901 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
902 (struct sockaddr *)&ia->ia_addr,
903 (struct sockaddr *)&ia->ia_prefixmask,
904 rtflags, (struct rtentry **)0);
905 }
906
907 /* remove from the linked list */
908 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
909 IFAFREE(&ia->ia_ifa);
910
911 /* also remove from the IPv6 address chain(itojun&jinmei) */
912 oia = ia;
913 if (oia == (ia = in6_ifaddr))
914 in6_ifaddr = ia->ia_next;
915 else {
916 while (ia->ia_next && (ia->ia_next != oia))
917 ia = ia->ia_next;
918 if (ia->ia_next)
919 ia->ia_next = oia->ia_next;
920 else {
921 nd6log((LOG_ERR,
922 "%s: didn't unlink in6ifaddr from list\n",
923 if_name(ifp)));
924 }
925 }
926
927 IFAFREE(&oia->ia_ifa);
928 }
929
930 /* cleanup multicast address kludge table, if there is any */
931 in6_purgemkludge(ifp);
932
933 /*
934 * remove neighbor management table. we call it twice just to make
935 * sure we nuke everything. maybe we need just one call.
936 * XXX: since the first call did not release addresses, some prefixes
937 * might remain. We should call nd6_purge() again to release the
938 * prefixes after removing all addresses above.
939 * (Or can we just delay calling nd6_purge until at this point?)
940 */
941 nd6_purge(ifp);
942 }
943
944 int
945 in6_get_tmpifid(ifp, retbuf, baseid, generate)
946 struct ifnet *ifp;
947 u_int8_t *retbuf;
948 const u_int8_t *baseid;
949 int generate;
950 {
951 u_int8_t nullbuf[8];
952 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
953
954 memset(nullbuf, 0, sizeof(nullbuf));
955 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
956 /* we've never created a random ID. Create a new one. */
957 generate = 1;
958 }
959
960 if (generate) {
961 memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1));
962
963 /* generate_tmp_ifid will update seedn and buf */
964 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
965 ndi->randomid);
966 }
967 memcpy(retbuf, ndi->randomid, 8);
968 if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) {
969 /* generate_tmp_ifid could not found a good ID. */
970 return (-1);
971 }
972
973 return (0);
974 }
975
976 void
977 in6_tmpaddrtimer(void *ignored_arg)
978 {
979 struct nd_ifinfo *ndi;
980 u_int8_t nullbuf[8];
981 struct ifnet *ifp;
982 int s = splsoftnet();
983
984 callout_reset(&in6_tmpaddrtimer_ch,
985 (ip6_temp_preferred_lifetime - ip6_desync_factor -
986 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
987
988 memset(nullbuf, 0, sizeof(nullbuf));
989 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
990 ndi = ND_IFINFO(ifp);
991 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
992 /*
993 * We've been generating a random ID on this interface.
994 * Create a new one.
995 */
996 (void)generate_tmp_ifid(ndi->randomseed0,
997 ndi->randomseed1, ndi->randomid);
998 }
999 }
1000
1001 splx(s);
1002 }
Cache object: 1b26032b110b5ef86d95214373513287
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