1 /* $OpenBSD: in6_ifattach.c,v 1.45 2007/06/08 09:31:38 henning 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/param.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/socket.h>
37 #include <sys/sockio.h>
38 #include <sys/kernel.h>
39 #include <sys/syslog.h>
40
41 #include <crypto/md5.h>
42
43 #include <net/if.h>
44 #include <net/if_dl.h>
45 #include <net/if_types.h>
46 #include <net/route.h>
47
48 #include <netinet/in.h>
49 #include <netinet/in_var.h>
50 #include <netinet/if_ether.h>
51
52 #include <netinet/ip6.h>
53 #include <netinet6/ip6_var.h>
54 #include <netinet6/in6_ifattach.h>
55 #include <netinet6/ip6_var.h>
56 #include <netinet6/nd6.h>
57 #ifdef MROUTING
58 #include <netinet6/ip6_mroute.h>
59 #endif
60
61 unsigned long in6_maxmtu = 0;
62
63 int ip6_auto_linklocal = 1; /* enable by default */
64
65 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
66 static int get_hw_ifid(struct ifnet *, struct in6_addr *);
67 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
68 static int in6_ifattach_loopback(struct ifnet *);
69
70 #define EUI64_GBIT 0x01
71 #define EUI64_UBIT 0x02
72 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
73 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
74 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
75 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
76 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
77
78 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
79 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
80
81 /*
82 * Generate a last-resort interface identifier, when the machine has no
83 * IEEE802/EUI64 address sources.
84 * The goal here is to get an interface identifier that is
85 * (1) random enough and (2) does not change across reboot.
86 * We currently use MD5(hostname) for it.
87 */
88 static int
89 get_rand_ifid(ifp, in6)
90 struct ifnet *ifp;
91 struct in6_addr *in6; /* upper 64bits are preserved */
92 {
93 MD5_CTX ctxt;
94 u_int8_t digest[16];
95
96 #if 0
97 /* we need at least several letters as seed for ifid */
98 if (hostnamelen < 3)
99 return -1;
100 #endif
101
102 /* generate 8 bytes of pseudo-random value. */
103 bzero(&ctxt, sizeof(ctxt));
104 MD5Init(&ctxt);
105 MD5Update(&ctxt, hostname, hostnamelen);
106 MD5Final(digest, &ctxt);
107
108 /* assumes sizeof(digest) > sizeof(ifid) */
109 bcopy(digest, &in6->s6_addr[8], 8);
110
111 /* make sure to set "u" bit to local, and "g" bit to individual. */
112 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
113 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
114
115 /* convert EUI64 into IPv6 interface identifier */
116 EUI64_TO_IFID(in6);
117
118 return 0;
119 }
120
121 /*
122 * Get interface identifier for the specified interface.
123 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
124 */
125 static int
126 get_hw_ifid(ifp, in6)
127 struct ifnet *ifp;
128 struct in6_addr *in6; /* upper 64bits are preserved */
129 {
130 struct ifaddr *ifa;
131 struct sockaddr_dl *sdl;
132 char *addr;
133 size_t addrlen;
134 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
135 static u_int8_t allone[8] =
136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
137
138 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
139 if (ifa->ifa_addr->sa_family != AF_LINK)
140 continue;
141 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
142 if (sdl == NULL)
143 continue;
144 if (sdl->sdl_alen == 0)
145 continue;
146
147 goto found;
148 }
149
150 return -1;
151
152 found:
153 addr = LLADDR(sdl);
154 addrlen = sdl->sdl_alen;
155
156 switch (ifp->if_type) {
157 case IFT_IEEE1394:
158 case IFT_IEEE80211:
159 /* IEEE1394 uses 16byte length address starting with EUI64 */
160 if (addrlen > 8)
161 addrlen = 8;
162 break;
163 default:
164 break;
165 }
166
167 /* get EUI64 */
168 switch (ifp->if_type) {
169 /* IEEE802/EUI64 cases - what others? */
170 case IFT_ETHER:
171 case IFT_CARP:
172 case IFT_FDDI:
173 case IFT_ATM:
174 case IFT_IEEE1394:
175 case IFT_IEEE80211:
176 /* look at IEEE802/EUI64 only */
177 if (addrlen != 8 && addrlen != 6)
178 return -1;
179
180 /*
181 * check for invalid MAC address - on bsdi, we see it a lot
182 * since wildboar configures all-zero MAC on pccard before
183 * card insertion.
184 */
185 if (bcmp(addr, allzero, addrlen) == 0)
186 return -1;
187 if (bcmp(addr, allone, addrlen) == 0)
188 return -1;
189
190 /* make EUI64 address */
191 if (addrlen == 8)
192 bcopy(addr, &in6->s6_addr[8], 8);
193 else if (addrlen == 6) {
194 in6->s6_addr[8] = addr[0];
195 in6->s6_addr[9] = addr[1];
196 in6->s6_addr[10] = addr[2];
197 in6->s6_addr[11] = 0xff;
198 in6->s6_addr[12] = 0xfe;
199 in6->s6_addr[13] = addr[3];
200 in6->s6_addr[14] = addr[4];
201 in6->s6_addr[15] = addr[5];
202 }
203 break;
204
205 case IFT_GIF:
206 /*
207 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
208 * however, IPv4 address is not very suitable as unique
209 * identifier source (can be renumbered).
210 * we don't do this.
211 */
212 return -1;
213
214 default:
215 return -1;
216 }
217
218 /* sanity check: g bit must not indicate "group" */
219 if (EUI64_GROUP(in6))
220 return -1;
221
222 /* convert EUI64 into IPv6 interface identifier */
223 EUI64_TO_IFID(in6);
224
225 /*
226 * sanity check: ifid must not be all zero, avoid conflict with
227 * subnet router anycast
228 */
229 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
230 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
231 return -1;
232 }
233
234 return 0;
235 }
236
237 /*
238 * Get interface identifier for the specified interface. If it is not
239 * available on ifp0, borrow interface identifier from other information
240 * sources.
241 */
242 static int
243 get_ifid(ifp0, altifp, in6)
244 struct ifnet *ifp0;
245 struct ifnet *altifp; /* secondary EUI64 source */
246 struct in6_addr *in6;
247 {
248 struct ifnet *ifp;
249
250 /* first, try to get it from the interface itself */
251 if (get_hw_ifid(ifp0, in6) == 0) {
252 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
253 ifp0->if_xname));
254 goto success;
255 }
256
257 /* try secondary EUI64 source. this basically is for ATM PVC */
258 if (altifp && get_hw_ifid(altifp, in6) == 0) {
259 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
260 ifp0->if_xname, altifp->if_xname));
261 goto success;
262 }
263
264 /* next, try to get it from some other hardware interface */
265 TAILQ_FOREACH(ifp, &ifnet, if_list) {
266 if (ifp == ifp0)
267 continue;
268 if (get_hw_ifid(ifp, in6) != 0)
269 continue;
270
271 /*
272 * to borrow ifid from other interface, ifid needs to be
273 * globally unique
274 */
275 if (IFID_UNIVERSAL(in6)) {
276 nd6log((LOG_DEBUG,
277 "%s: borrow interface identifier from %s\n",
278 ifp0->if_xname, ifp->if_xname));
279 goto success;
280 }
281 }
282
283 /* last resort: get from random number source */
284 if (get_rand_ifid(ifp, in6) == 0) {
285 nd6log((LOG_DEBUG,
286 "%s: interface identifier generated by random number\n",
287 ifp0->if_xname));
288 goto success;
289 }
290
291 printf("%s: failed to get interface identifier\n", ifp0->if_xname);
292 return -1;
293
294 success:
295 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
296 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
297 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
298 in6->s6_addr[14], in6->s6_addr[15]));
299 return 0;
300 }
301
302 int
303 in6_ifattach_linklocal(ifp, altifp)
304 struct ifnet *ifp;
305 struct ifnet *altifp; /*secondary EUI64 source*/
306 {
307 struct in6_ifaddr *ia;
308 struct in6_aliasreq ifra;
309 struct nd_prefix pr0;
310 int i, error;
311
312 /*
313 * configure link-local address.
314 */
315 bzero(&ifra, sizeof(ifra));
316
317 /*
318 * in6_update_ifa() does not use ifra_name, but we accurately set it
319 * for safety.
320 */
321 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name));
322
323 ifra.ifra_addr.sin6_family = AF_INET6;
324 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
325 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
326 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
327 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
328 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
329 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
330 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
331 } else {
332 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
333 nd6log((LOG_ERR,
334 "%s: no ifid available\n", ifp->if_xname));
335 return (-1);
336 }
337 }
338
339 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
340 ifra.ifra_prefixmask.sin6_family = AF_INET6;
341 ifra.ifra_prefixmask.sin6_addr = in6mask64;
342 /* link-local addresses should NEVER expire. */
343 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
344 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
345
346 /*
347 * Do not let in6_update_ifa() do DAD, since we need a random delay
348 * before sending an NS at the first time the interface becomes up.
349 * Instead, in6_if_up() will start DAD with a proper random delay.
350 */
351 ifra.ifra_flags |= IN6_IFF_NODAD;
352
353 /*
354 * Now call in6_update_ifa() to do a bunch of procedures to configure
355 * a link-local address. In the case of CARP, we may be called after
356 * one has already been configured, so check if it's already there
357 * with in6ifa_ifpforlinklocal() and clobber it if it exists.
358 */
359 if ((error = in6_update_ifa(ifp, &ifra,
360 in6ifa_ifpforlinklocal(ifp, 0))) != 0) {
361 /*
362 * XXX: When the interface does not support IPv6, this call
363 * would fail in the SIOCSIFADDR ioctl. I believe the
364 * notification is rather confusing in this case, so just
365 * suppress it. (jinmei@kame.net 20010130)
366 */
367 if (error != EAFNOSUPPORT)
368 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
369 "configure a link-local address on %s "
370 "(errno=%d)\n",
371 ifp->if_xname, error));
372 return (-1);
373 }
374
375 /*
376 * Adjust ia6_flags so that in6_if_up will perform DAD.
377 * XXX: Some P2P interfaces seem not to send packets just after
378 * becoming up, so we skip p2p interfaces for safety.
379 */
380 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
381 #ifdef DIAGNOSTIC
382 if (!ia) {
383 panic("ia == NULL in in6_ifattach_linklocal");
384 /* NOTREACHED */
385 }
386 #endif
387 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) ||
388 (ifp->if_type == IFT_CARP)) == 0) {
389 ia->ia6_flags &= ~IN6_IFF_NODAD;
390 ia->ia6_flags |= IN6_IFF_TENTATIVE;
391 }
392
393 /*
394 * Make the link-local prefix (fe80::/64%link) as on-link.
395 * Since we'd like to manage prefixes separately from addresses,
396 * we make an ND6 prefix structure for the link-local prefix,
397 * and add it to the prefix list as a never-expire prefix.
398 * XXX: this change might affect some existing code base...
399 */
400 bzero(&pr0, sizeof(pr0));
401 pr0.ndpr_ifp = ifp;
402 /* this should be 64 at this moment. */
403 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
404 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
405 pr0.ndpr_prefix = ifra.ifra_addr;
406 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
407 for (i = 0; i < 4; i++) {
408 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
409 in6mask64.s6_addr32[i];
410 }
411 /*
412 * Initialize parameters. The link-local prefix must always be
413 * on-link, and its lifetimes never expire.
414 */
415 pr0.ndpr_raf_onlink = 1;
416 pr0.ndpr_raf_auto = 1; /* probably meaningless */
417 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
418 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
419 /*
420 * Since there is no other link-local addresses, nd6_prefix_lookup()
421 * probably returns NULL. However, we cannot always expect the result.
422 * For example, if we first remove the (only) existing link-local
423 * address, and then reconfigure another one, the prefix is still
424 * valid with referring to the old link-local address.
425 */
426 if (nd6_prefix_lookup(&pr0) == NULL) {
427 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
428 return (error);
429 }
430
431 return 0;
432 }
433
434 static int
435 in6_ifattach_loopback(ifp)
436 struct ifnet *ifp; /* must be IFT_LOOP */
437 {
438 struct in6_aliasreq ifra;
439 int error;
440
441 bzero(&ifra, sizeof(ifra));
442
443 /*
444 * in6_update_ifa() does not use ifra_name, but we accurately set it
445 * for safety.
446 */
447 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name));
448
449 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
450 ifra.ifra_prefixmask.sin6_family = AF_INET6;
451 ifra.ifra_prefixmask.sin6_addr = in6mask128;
452
453 /*
454 * Always initialize ia_dstaddr (= broadcast address) to loopback
455 * address. Follows IPv4 practice - see in_ifinit().
456 */
457 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
458 ifra.ifra_dstaddr.sin6_family = AF_INET6;
459 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
460
461 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
462 ifra.ifra_addr.sin6_family = AF_INET6;
463 ifra.ifra_addr.sin6_addr = in6addr_loopback;
464
465 /* the loopback address should NEVER expire. */
466 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
467 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
468
469 /* we don't need to perform DAD on loopback interfaces. */
470 ifra.ifra_flags |= IN6_IFF_NODAD;
471
472 /*
473 * We are sure that this is a newly assigned address, so we can set
474 * NULL to the 3rd arg.
475 */
476 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
477 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
478 "the loopback address on %s (errno=%d)\n",
479 ifp->if_xname, error));
480 return (-1);
481 }
482
483 return 0;
484 }
485
486 /*
487 * compute NI group address, based on the current hostname setting.
488 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
489 *
490 * when ifp == NULL, the caller is responsible for filling scopeid.
491 */
492 int
493 in6_nigroup(ifp, name, namelen, sa6)
494 struct ifnet *ifp;
495 const char *name;
496 int namelen;
497 struct sockaddr_in6 *sa6;
498 {
499 const char *p;
500 u_int8_t *q;
501 MD5_CTX ctxt;
502 u_int8_t digest[16];
503 u_int8_t l;
504 u_int8_t n[64]; /* a single label must not exceed 63 chars */
505
506 if (!namelen || !name)
507 return -1;
508
509 p = name;
510 while (p && *p && *p != '.' && p - name < namelen)
511 p++;
512 if (p - name > sizeof(n) - 1)
513 return -1; /* label too long */
514 l = p - name;
515 strncpy((char *)n, name, l);
516 n[(int)l] = '\0';
517 for (q = n; *q; q++) {
518 if ('A' <= *q && *q <= 'Z')
519 *q = *q - 'A' + 'a';
520 }
521
522 /* generate 8 bytes of pseudo-random value. */
523 bzero(&ctxt, sizeof(ctxt));
524 MD5Init(&ctxt);
525 MD5Update(&ctxt, &l, sizeof(l));
526 MD5Update(&ctxt, n, l);
527 MD5Final(digest, &ctxt);
528
529 bzero(sa6, sizeof(*sa6));
530 sa6->sin6_family = AF_INET6;
531 sa6->sin6_len = sizeof(*sa6);
532 sa6->sin6_addr.s6_addr16[0] = htons(0xff02);
533 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
534 sa6->sin6_addr.s6_addr8[11] = 2;
535 bcopy(digest, &sa6->sin6_addr.s6_addr32[3],
536 sizeof(sa6->sin6_addr.s6_addr32[3]));
537
538 return 0;
539 }
540
541 /*
542 * XXX multiple loopback interface needs more care. for instance,
543 * nodelocal address needs to be configured onto only one of them.
544 * XXX multiple link-local address case
545 */
546 void
547 in6_ifattach(ifp, altifp)
548 struct ifnet *ifp;
549 struct ifnet *altifp; /* secondary EUI64 source */
550 {
551 struct in6_ifaddr *ia;
552 struct in6_addr in6;
553
554 /* some of the interfaces are inherently not IPv6 capable */
555 switch (ifp->if_type) {
556 case IFT_BRIDGE:
557 case IFT_ENC:
558 case IFT_PFLOG:
559 case IFT_PFSYNC:
560 return;
561 }
562
563 /*
564 * if link mtu is too small, don't try to configure IPv6.
565 * remember there could be some link-layer that has special
566 * fragmentation logic.
567 */
568 if (ifp->if_mtu < IPV6_MMTU) {
569 nd6log((LOG_INFO, "in6_ifattach: "
570 "%s has too small MTU, IPv6 not enabled\n",
571 ifp->if_xname));
572 return;
573 }
574
575 /* create a multicast kludge storage (if we have not had one) */
576 in6_createmkludge(ifp);
577
578 /*
579 * quirks based on interface type
580 */
581 switch (ifp->if_type) {
582 /* we attach a link-local address when a vhid is assigned */
583 case IFT_CARP:
584 return;
585 default:
586 break;
587 }
588
589 /*
590 * usually, we require multicast capability to the interface
591 */
592 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
593 nd6log((LOG_INFO, "in6_ifattach: "
594 "%s is not multicast capable, IPv6 not enabled\n",
595 ifp->if_xname));
596 return;
597 }
598
599 /*
600 * assign loopback address for loopback interface.
601 * XXX multiple loopback interface case.
602 */
603 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
604 in6 = in6addr_loopback;
605 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
606 if (in6_ifattach_loopback(ifp) != 0)
607 return;
608 }
609 }
610
611 /*
612 * assign a link-local address, if there's none.
613 */
614 if (ip6_auto_linklocal) {
615 ia = in6ifa_ifpforlinklocal(ifp, 0);
616 if (ia == NULL) {
617 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
618 /* linklocal address assigned */
619 } else {
620 /* failed to assign linklocal address. bark? */
621 }
622 }
623 }
624 }
625
626 /*
627 * NOTE: in6_ifdetach() does not support loopback if at this moment.
628 */
629 void
630 in6_ifdetach(ifp)
631 struct ifnet *ifp;
632 {
633 struct in6_ifaddr *ia, *oia;
634 struct ifaddr *ifa, *next;
635 struct rtentry *rt;
636 short rtflags;
637 struct sockaddr_in6 sin6;
638 struct in6_multi_mship *imm;
639
640 #ifdef MROUTING
641 /* remove ip6_mrouter stuff */
642 ip6_mrouter_detach(ifp);
643 #endif
644
645 /* remove neighbor management table */
646 nd6_purge(ifp);
647
648 /* nuke any of IPv6 addresses we have */
649 for (ifa = TAILQ_FIRST(&ifp->if_addrlist);
650 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) {
651 next = TAILQ_NEXT(ifa, ifa_list);
652 if (ifa->ifa_addr->sa_family != AF_INET6)
653 continue;
654 in6_purgeaddr(ifa);
655 }
656
657 /* undo everything done by in6_ifattach(), just in case */
658 for (ifa = TAILQ_FIRST(&ifp->if_addrlist);
659 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) {
660 next = TAILQ_NEXT(ifa, ifa_list);
661
662 if (ifa->ifa_addr->sa_family != AF_INET6
663 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
664 continue;
665 }
666
667 ia = (struct in6_ifaddr *)ifa;
668
669 /*
670 * leave from multicast groups we have joined for the interface
671 */
672 while (!LIST_EMPTY(&ia->ia6_memberships)) {
673 imm = LIST_FIRST(&ia->ia6_memberships);
674 LIST_REMOVE(imm, i6mm_chain);
675 in6_leavegroup(imm);
676 }
677
678 /* remove from the routing table */
679 if ((ia->ia_flags & IFA_ROUTE) &&
680 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) {
681 rtflags = rt->rt_flags;
682 rtfree(rt);
683 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
684 (struct sockaddr *)&ia->ia_addr,
685 (struct sockaddr *)&ia->ia_prefixmask,
686 rtflags, (struct rtentry **)0, 0);
687 }
688
689 /* remove from the linked list */
690 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
691 IFAFREE(&ia->ia_ifa);
692
693 /* also remove from the IPv6 address chain(itojun&jinmei) */
694 oia = ia;
695 if (oia == (ia = in6_ifaddr))
696 in6_ifaddr = ia->ia_next;
697 else {
698 while (ia->ia_next && (ia->ia_next != oia))
699 ia = ia->ia_next;
700 if (ia->ia_next)
701 ia->ia_next = oia->ia_next;
702 else {
703 nd6log((LOG_ERR,
704 "%s: didn't unlink in6ifaddr from list\n",
705 ifp->if_xname));
706 }
707 }
708
709 IFAFREE(&oia->ia_ifa);
710 }
711
712 /* cleanup multicast address kludge table, if there is any */
713 in6_purgemkludge(ifp);
714
715 /*
716 * remove neighbor management table. we call it twice just to make
717 * sure we nuke everything. maybe we need just one call.
718 * XXX: since the first call did not release addresses, some prefixes
719 * might remain. We should call nd6_purge() again to release the
720 * prefixes after removing all addresses above.
721 * (Or can we just delay calling nd6_purge until at this point?)
722 */
723 nd6_purge(ifp);
724
725 /* remove route to link-local allnodes multicast (ff02::1) */
726 bzero(&sin6, sizeof(sin6));
727 sin6.sin6_len = sizeof(struct sockaddr_in6);
728 sin6.sin6_family = AF_INET6;
729 sin6.sin6_addr = in6addr_linklocal_allnodes;
730 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
731 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
732 if (rt && rt->rt_ifp == ifp) {
733 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
734 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0, 0);
735 rtfree(rt);
736 }
737 }