1 /* $FreeBSD: releng/6.2/sys/netinet6/in6_ifattach.c 163435 2006-10-16 15:09:24Z ume $ */
2 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun 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 #include <sys/md5.h>
41
42 #include <net/if.h>
43 #include <net/if_dl.h>
44 #include <net/if_types.h>
45 #include <net/route.h>
46
47 #include <netinet/in.h>
48 #include <netinet/in_var.h>
49 #include <netinet/if_ether.h>
50 #include <netinet/in_pcb.h>
51
52 #include <netinet/ip6.h>
53 #include <netinet6/ip6_var.h>
54 #include <netinet6/in6_var.h>
55 #include <netinet6/in6_pcb.h>
56 #include <netinet6/in6_ifattach.h>
57 #include <netinet6/ip6_var.h>
58 #include <netinet6/nd6.h>
59 #include <netinet6/scope6_var.h>
60
61 #include <net/net_osdep.h>
62
63 unsigned long in6_maxmtu = 0;
64
65 #ifdef IP6_AUTO_LINKLOCAL
66 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
67 #else
68 int ip6_auto_linklocal = 1; /* enable by default */
69 #endif
70
71 struct callout in6_tmpaddrtimer_ch;
72
73 extern struct inpcbinfo udbinfo;
74 extern struct inpcbinfo ripcbinfo;
75
76 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *));
77 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *));
78 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *));
79 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *));
80 static int in6_ifattach_loopback __P((struct ifnet *));
81
82 #define EUI64_GBIT 0x01
83 #define EUI64_UBIT 0x02
84 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
85 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
86 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
87 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
88 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
89
90 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
91 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
92
93 /*
94 * Generate a last-resort interface identifier, when the machine has no
95 * IEEE802/EUI64 address sources.
96 * The goal here is to get an interface identifier that is
97 * (1) random enough and (2) does not change across reboot.
98 * We currently use MD5(hostname) for it.
99 */
100 static int
101 get_rand_ifid(ifp, in6)
102 struct ifnet *ifp;
103 struct in6_addr *in6; /* upper 64bits are preserved */
104 {
105 MD5_CTX ctxt;
106 u_int8_t digest[16];
107 int hostnamelen = strlen(hostname);
108
109 #if 0
110 /* we need at least several letters as seed for ifid */
111 if (hostnamelen < 3)
112 return -1;
113 #endif
114
115 /* generate 8 bytes of pseudo-random value. */
116 bzero(&ctxt, sizeof(ctxt));
117 MD5Init(&ctxt);
118 MD5Update(&ctxt, hostname, hostnamelen);
119 MD5Final(digest, &ctxt);
120
121 /* assumes sizeof(digest) > sizeof(ifid) */
122 bcopy(digest, &in6->s6_addr[8], 8);
123
124 /* make sure to set "u" bit to local, and "g" bit to individual. */
125 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
126 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
127
128 /* convert EUI64 into IPv6 interface identifier */
129 EUI64_TO_IFID(in6);
130
131 return 0;
132 }
133
134 static int
135 generate_tmp_ifid(seed0, seed1, ret)
136 u_int8_t *seed0, *ret;
137 const u_int8_t *seed1;
138 {
139 MD5_CTX ctxt;
140 u_int8_t seed[16], digest[16], nullbuf[8];
141 u_int32_t val32;
142
143 /* If there's no hisotry, start with a random seed. */
144 bzero(nullbuf, sizeof(nullbuf));
145 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
146 int i;
147
148 for (i = 0; i < 2; i++) {
149 val32 = arc4random();
150 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
151 }
152 } else
153 bcopy(seed0, seed, 8);
154
155 /* copy the right-most 64-bits of the given address */
156 /* XXX assumption on the size of IFID */
157 bcopy(seed1, &seed[8], 8);
158
159 if (0) { /* for debugging purposes only */
160 int i;
161
162 printf("generate_tmp_ifid: new randomized ID from: ");
163 for (i = 0; i < 16; i++)
164 printf("%02x", seed[i]);
165 printf(" ");
166 }
167
168 /* generate 16 bytes of pseudo-random value. */
169 bzero(&ctxt, sizeof(ctxt));
170 MD5Init(&ctxt);
171 MD5Update(&ctxt, seed, sizeof(seed));
172 MD5Final(digest, &ctxt);
173
174 /*
175 * RFC 3041 3.2.1. (3)
176 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
177 * left-most bit is numbered 0) to zero.
178 */
179 bcopy(digest, ret, 8);
180 ret[0] &= ~EUI64_UBIT;
181
182 /*
183 * XXX: we'd like to ensure that the generated value is not zero
184 * for simplicity. If the caclculated digest happens to be zero,
185 * use a random non-zero value as the last resort.
186 */
187 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
188 nd6log((LOG_INFO,
189 "generate_tmp_ifid: computed MD5 value is zero.\n"));
190
191 val32 = arc4random();
192 val32 = 1 + (val32 % (0xffffffff - 1));
193 }
194
195 /*
196 * RFC 3041 3.2.1. (4)
197 * Take the rightmost 64-bits of the MD5 digest and save them in
198 * stable storage as the history value to be used in the next
199 * iteration of the algorithm.
200 */
201 bcopy(&digest[8], seed0, 8);
202
203 if (0) { /* for debugging purposes only */
204 int i;
205
206 printf("to: ");
207 for (i = 0; i < 16; i++)
208 printf("%02x", digest[i]);
209 printf("\n");
210 }
211
212 return 0;
213 }
214
215 /*
216 * Get interface identifier for the specified interface.
217 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
218 */
219 int
220 in6_get_hw_ifid(ifp, in6)
221 struct ifnet *ifp;
222 struct in6_addr *in6; /* upper 64bits are preserved */
223 {
224 struct ifaddr *ifa;
225 struct sockaddr_dl *sdl;
226 u_int8_t *addr;
227 size_t addrlen;
228 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
229 static u_int8_t allone[8] =
230 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
231
232 for (ifa = ifp->if_addrlist.tqh_first;
233 ifa;
234 ifa = ifa->ifa_list.tqe_next) {
235 if (ifa->ifa_addr->sa_family != AF_LINK)
236 continue;
237 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
238 if (sdl == NULL)
239 continue;
240 if (sdl->sdl_alen == 0)
241 continue;
242
243 goto found;
244 }
245
246 return -1;
247
248 found:
249 addr = LLADDR(sdl);
250 addrlen = sdl->sdl_alen;
251
252 /* get EUI64 */
253 switch (ifp->if_type) {
254 case IFT_ETHER:
255 case IFT_FDDI:
256 case IFT_ISO88025:
257 case IFT_ATM:
258 case IFT_IEEE1394:
259 #ifdef IFT_IEEE80211
260 case IFT_IEEE80211:
261 #endif
262 /* IEEE802/EUI64 cases - what others? */
263 /* IEEE1394 uses 16byte length address starting with EUI64 */
264 if (addrlen > 8)
265 addrlen = 8;
266
267 /* look at IEEE802/EUI64 only */
268 if (addrlen != 8 && addrlen != 6)
269 return -1;
270
271 /*
272 * check for invalid MAC address - on bsdi, we see it a lot
273 * since wildboar configures all-zero MAC on pccard before
274 * card insertion.
275 */
276 if (bcmp(addr, allzero, addrlen) == 0)
277 return -1;
278 if (bcmp(addr, allone, addrlen) == 0)
279 return -1;
280
281 /* make EUI64 address */
282 if (addrlen == 8)
283 bcopy(addr, &in6->s6_addr[8], 8);
284 else if (addrlen == 6) {
285 in6->s6_addr[8] = addr[0];
286 in6->s6_addr[9] = addr[1];
287 in6->s6_addr[10] = addr[2];
288 in6->s6_addr[11] = 0xff;
289 in6->s6_addr[12] = 0xfe;
290 in6->s6_addr[13] = addr[3];
291 in6->s6_addr[14] = addr[4];
292 in6->s6_addr[15] = addr[5];
293 }
294 break;
295
296 case IFT_ARCNET:
297 if (addrlen != 1)
298 return -1;
299 if (!addr[0])
300 return -1;
301
302 bzero(&in6->s6_addr[8], 8);
303 in6->s6_addr[15] = addr[0];
304
305 /*
306 * due to insufficient bitwidth, we mark it local.
307 */
308 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
309 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
310 break;
311
312 case IFT_GIF:
313 #ifdef IFT_STF
314 case IFT_STF:
315 #endif
316 /*
317 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
318 * however, IPv4 address is not very suitable as unique
319 * identifier source (can be renumbered).
320 * we don't do this.
321 */
322 return -1;
323
324 default:
325 return -1;
326 }
327
328 /* sanity check: g bit must not indicate "group" */
329 if (EUI64_GROUP(in6))
330 return -1;
331
332 /* convert EUI64 into IPv6 interface identifier */
333 EUI64_TO_IFID(in6);
334
335 /*
336 * sanity check: ifid must not be all zero, avoid conflict with
337 * subnet router anycast
338 */
339 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
340 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
341 return -1;
342 }
343
344 return 0;
345 }
346
347 /*
348 * Get interface identifier for the specified interface. If it is not
349 * available on ifp0, borrow interface identifier from other information
350 * sources.
351 */
352 static int
353 get_ifid(ifp0, altifp, in6)
354 struct ifnet *ifp0;
355 struct ifnet *altifp; /* secondary EUI64 source */
356 struct in6_addr *in6;
357 {
358 struct ifnet *ifp;
359
360 /* first, try to get it from the interface itself */
361 if (in6_get_hw_ifid(ifp0, in6) == 0) {
362 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
363 if_name(ifp0)));
364 goto success;
365 }
366
367 /* try secondary EUI64 source. this basically is for ATM PVC */
368 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
369 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
370 if_name(ifp0), if_name(altifp)));
371 goto success;
372 }
373
374 /* next, try to get it from some other hardware interface */
375 IFNET_RLOCK();
376 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
377 if (ifp == ifp0)
378 continue;
379 if (in6_get_hw_ifid(ifp, in6) != 0)
380 continue;
381
382 /*
383 * to borrow ifid from other interface, ifid needs to be
384 * globally unique
385 */
386 if (IFID_UNIVERSAL(in6)) {
387 nd6log((LOG_DEBUG,
388 "%s: borrow interface identifier from %s\n",
389 if_name(ifp0), if_name(ifp)));
390 IFNET_RUNLOCK();
391 goto success;
392 }
393 }
394 IFNET_RUNLOCK();
395
396 /* last resort: get from random number source */
397 if (get_rand_ifid(ifp, in6) == 0) {
398 nd6log((LOG_DEBUG,
399 "%s: interface identifier generated by random number\n",
400 if_name(ifp0)));
401 goto success;
402 }
403
404 printf("%s: failed to get interface identifier\n", if_name(ifp0));
405 return -1;
406
407 success:
408 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
409 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
410 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
411 in6->s6_addr[14], in6->s6_addr[15]));
412 return 0;
413 }
414
415 static int
416 in6_ifattach_linklocal(ifp, altifp)
417 struct ifnet *ifp;
418 struct ifnet *altifp; /* secondary EUI64 source */
419 {
420 struct in6_ifaddr *ia;
421 struct in6_aliasreq ifra;
422 struct nd_prefixctl pr0;
423 int i, error;
424
425 /*
426 * configure link-local address.
427 */
428 bzero(&ifra, sizeof(ifra));
429
430 /*
431 * in6_update_ifa() does not use ifra_name, but we accurately set it
432 * for safety.
433 */
434 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
435
436 ifra.ifra_addr.sin6_family = AF_INET6;
437 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
438 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
439 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
440 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
441 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
442 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
443 } else {
444 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
445 nd6log((LOG_ERR,
446 "%s: no ifid available\n", if_name(ifp)));
447 return (-1);
448 }
449 }
450 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
451 return (-1);
452
453 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
454 ifra.ifra_prefixmask.sin6_family = AF_INET6;
455 ifra.ifra_prefixmask.sin6_addr = in6mask64;
456 /* link-local addresses should NEVER expire. */
457 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
458 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
459
460 /*
461 * Now call in6_update_ifa() to do a bunch of procedures to configure
462 * a link-local address. We can set the 3rd argument to NULL, because
463 * we know there's no other link-local address on the interface
464 * and therefore we are adding one (instead of updating one).
465 */
466 if ((error = in6_update_ifa(ifp, &ifra, NULL,
467 IN6_IFAUPDATE_DADDELAY)) != 0) {
468 /*
469 * XXX: When the interface does not support IPv6, this call
470 * would fail in the SIOCSIFADDR ioctl. I believe the
471 * notification is rather confusing in this case, so just
472 * suppress it. (jinmei@kame.net 20010130)
473 */
474 if (error != EAFNOSUPPORT)
475 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
476 "configure a link-local address on %s "
477 "(errno=%d)\n",
478 if_name(ifp), error));
479 return (-1);
480 }
481
482 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
483 #ifdef DIAGNOSTIC
484 if (!ia) {
485 panic("ia == NULL in in6_ifattach_linklocal");
486 /* NOTREACHED */
487 }
488 #endif
489
490 /*
491 * Make the link-local prefix (fe80::%link/64) as on-link.
492 * Since we'd like to manage prefixes separately from addresses,
493 * we make an ND6 prefix structure for the link-local prefix,
494 * and add it to the prefix list as a never-expire prefix.
495 * XXX: this change might affect some existing code base...
496 */
497 bzero(&pr0, sizeof(pr0));
498 pr0.ndpr_ifp = ifp;
499 /* this should be 64 at this moment. */
500 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
501 pr0.ndpr_prefix = ifra.ifra_addr;
502 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
503 for (i = 0; i < 4; i++) {
504 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
505 in6mask64.s6_addr32[i];
506 }
507 /*
508 * Initialize parameters. The link-local prefix must always be
509 * on-link, and its lifetimes never expire.
510 */
511 pr0.ndpr_raf_onlink = 1;
512 pr0.ndpr_raf_auto = 1; /* probably meaningless */
513 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
514 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
515 /*
516 * Since there is no other link-local addresses, nd6_prefix_lookup()
517 * probably returns NULL. However, we cannot always expect the result.
518 * For example, if we first remove the (only) existing link-local
519 * address, and then reconfigure another one, the prefix is still
520 * valid with referring to the old link-local address.
521 */
522 if (nd6_prefix_lookup(&pr0) == NULL) {
523 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
524 return (error);
525 }
526
527 return 0;
528 }
529
530 static int
531 in6_ifattach_loopback(ifp)
532 struct ifnet *ifp; /* must be IFT_LOOP */
533 {
534 struct in6_aliasreq ifra;
535 int error;
536
537 bzero(&ifra, sizeof(ifra));
538
539 /*
540 * in6_update_ifa() does not use ifra_name, but we accurately set it
541 * for safety.
542 */
543 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
544
545 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
546 ifra.ifra_prefixmask.sin6_family = AF_INET6;
547 ifra.ifra_prefixmask.sin6_addr = in6mask128;
548
549 /*
550 * Always initialize ia_dstaddr (= broadcast address) to loopback
551 * address. Follows IPv4 practice - see in_ifinit().
552 */
553 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
554 ifra.ifra_dstaddr.sin6_family = AF_INET6;
555 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
556
557 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
558 ifra.ifra_addr.sin6_family = AF_INET6;
559 ifra.ifra_addr.sin6_addr = in6addr_loopback;
560
561 /* the loopback address should NEVER expire. */
562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
564
565 /* we don't need to perform DAD on loopback interfaces. */
566 ifra.ifra_flags |= IN6_IFF_NODAD;
567
568 /* skip registration to the prefix list. XXX should be temporary. */
569 ifra.ifra_flags |= IN6_IFF_NOPFX;
570
571 /*
572 * We are sure that this is a newly assigned address, so we can set
573 * NULL to the 3rd arg.
574 */
575 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
576 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
577 "the loopback address on %s (errno=%d)\n",
578 if_name(ifp), error));
579 return (-1);
580 }
581
582 return 0;
583 }
584
585 /*
586 * compute NI group address, based on the current hostname setting.
587 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
588 *
589 * when ifp == NULL, the caller is responsible for filling scopeid.
590 */
591 int
592 in6_nigroup(ifp, name, namelen, in6)
593 struct ifnet *ifp;
594 const char *name;
595 int namelen;
596 struct in6_addr *in6;
597 {
598 const char *p;
599 u_char *q;
600 MD5_CTX ctxt;
601 u_int8_t digest[16];
602 char l;
603 char n[64]; /* a single label must not exceed 63 chars */
604
605 if (!namelen || !name)
606 return -1;
607
608 p = name;
609 while (p && *p && *p != '.' && p - name < namelen)
610 p++;
611 if (p - name > sizeof(n) - 1)
612 return -1; /* label too long */
613 l = p - name;
614 strncpy(n, name, l);
615 n[(int)l] = '\0';
616 for (q = n; *q; q++) {
617 if ('A' <= *q && *q <= 'Z')
618 *q = *q - 'A' + 'a';
619 }
620
621 /* generate 8 bytes of pseudo-random value. */
622 bzero(&ctxt, sizeof(ctxt));
623 MD5Init(&ctxt);
624 MD5Update(&ctxt, &l, sizeof(l));
625 MD5Update(&ctxt, n, l);
626 MD5Final(digest, &ctxt);
627
628 bzero(in6, sizeof(*in6));
629 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
630 in6->s6_addr8[11] = 2;
631 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
632 if (in6_setscope(in6, ifp, NULL))
633 return (-1); /* XXX: should not fail */
634
635 return 0;
636 }
637
638 /*
639 * XXX multiple loopback interface needs more care. for instance,
640 * nodelocal address needs to be configured onto only one of them.
641 * XXX multiple link-local address case
642 */
643 void
644 in6_ifattach(ifp, altifp)
645 struct ifnet *ifp;
646 struct ifnet *altifp; /* secondary EUI64 source */
647 {
648 struct in6_ifaddr *ia;
649 struct in6_addr in6;
650
651 /* some of the interfaces are inherently not IPv6 capable */
652 switch (ifp->if_type) {
653 case IFT_PFLOG:
654 case IFT_PFSYNC:
655 case IFT_CARP:
656 return;
657 }
658
659 /*
660 * quirks based on interface type
661 */
662 switch (ifp->if_type) {
663 #ifdef IFT_STF
664 case IFT_STF:
665 /*
666 * 6to4 interface is a very special kind of beast.
667 * no multicast, no linklocal. RFC2529 specifies how to make
668 * linklocals for 6to4 interface, but there's no use and
669 * it is rather harmful to have one.
670 */
671 goto statinit;
672 #endif
673 default:
674 break;
675 }
676
677 /*
678 * usually, we require multicast capability to the interface
679 */
680 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
681 nd6log((LOG_INFO, "in6_ifattach: "
682 "%s is not multicast capable, IPv6 not enabled\n",
683 if_name(ifp)));
684 return;
685 }
686
687 /*
688 * assign loopback address for loopback interface.
689 * XXX multiple loopback interface case.
690 */
691 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
692 in6 = in6addr_loopback;
693 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
694 if (in6_ifattach_loopback(ifp) != 0)
695 return;
696 }
697 }
698
699 /*
700 * assign a link-local address, if there's none.
701 */
702 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
703 ia = in6ifa_ifpforlinklocal(ifp, 0);
704 if (ia == NULL) {
705 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
706 /* linklocal address assigned */
707 } else {
708 /* failed to assign linklocal address. bark? */
709 }
710 }
711 }
712
713 #ifdef IFT_STF /* XXX */
714 statinit:
715 #endif
716
717 /* update dynamically. */
718 if (in6_maxmtu < ifp->if_mtu)
719 in6_maxmtu = ifp->if_mtu;
720 }
721
722 /*
723 * NOTE: in6_ifdetach() does not support loopback if at this moment.
724 * We don't need this function in bsdi, because interfaces are never removed
725 * from the ifnet list in bsdi.
726 */
727 void
728 in6_ifdetach(ifp)
729 struct ifnet *ifp;
730 {
731 struct in6_ifaddr *ia, *oia;
732 struct ifaddr *ifa, *next;
733 struct rtentry *rt;
734 short rtflags;
735 struct sockaddr_in6 sin6;
736 struct in6_multi *in6m;
737 struct in6_multi *in6m_next;
738
739 /* remove neighbor management table */
740 nd6_purge(ifp);
741
742 /* nuke any of IPv6 addresses we have */
743 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
744 next = ifa->ifa_list.tqe_next;
745 if (ifa->ifa_addr->sa_family != AF_INET6)
746 continue;
747 in6_purgeaddr(ifa);
748 }
749
750 /* undo everything done by in6_ifattach(), just in case */
751 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
752 next = ifa->ifa_list.tqe_next;
753
754 if (ifa->ifa_addr->sa_family != AF_INET6
755 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
756 continue;
757 }
758
759 ia = (struct in6_ifaddr *)ifa;
760
761 /* remove from the routing table */
762 if ((ia->ia_flags & IFA_ROUTE) &&
763 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
764 rtflags = rt->rt_flags;
765 rtfree(rt);
766 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
767 (struct sockaddr *)&ia->ia_addr,
768 (struct sockaddr *)&ia->ia_prefixmask,
769 rtflags, (struct rtentry **)0);
770 }
771
772 /* remove from the linked list */
773 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
774 IFAFREE(&ia->ia_ifa);
775
776 /* also remove from the IPv6 address chain(itojun&jinmei) */
777 oia = ia;
778 if (oia == (ia = in6_ifaddr))
779 in6_ifaddr = ia->ia_next;
780 else {
781 while (ia->ia_next && (ia->ia_next != oia))
782 ia = ia->ia_next;
783 if (ia->ia_next)
784 ia->ia_next = oia->ia_next;
785 else {
786 nd6log((LOG_ERR,
787 "%s: didn't unlink in6ifaddr from list\n",
788 if_name(ifp)));
789 }
790 }
791
792 IFAFREE(&oia->ia_ifa);
793 }
794
795 /* leave from all multicast groups joined */
796
797 if (udbinfo.listhead != NULL)
798 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp);
799 if (ripcbinfo.listhead != NULL)
800 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp);
801
802 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
803 in6m_next = LIST_NEXT(in6m, in6m_entry);
804 if (in6m->in6m_ifp != ifp)
805 continue;
806 in6_delmulti(in6m);
807 in6m = NULL;
808 }
809
810 /*
811 * remove neighbor management table. we call it twice just to make
812 * sure we nuke everything. maybe we need just one call.
813 * XXX: since the first call did not release addresses, some prefixes
814 * might remain. We should call nd6_purge() again to release the
815 * prefixes after removing all addresses above.
816 * (Or can we just delay calling nd6_purge until at this point?)
817 */
818 nd6_purge(ifp);
819
820 /* remove route to link-local allnodes multicast (ff02::1) */
821 bzero(&sin6, sizeof(sin6));
822 sin6.sin6_len = sizeof(struct sockaddr_in6);
823 sin6.sin6_family = AF_INET6;
824 sin6.sin6_addr = in6addr_linklocal_allnodes;
825 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
826 /* XXX: should not fail */
827 return;
828 /* XXX grab lock first to avoid LOR */
829 if (rt_tables[AF_INET6] != NULL) {
830 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]);
831 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
832 if (rt) {
833 if (rt->rt_ifp == ifp)
834 rtexpunge(rt);
835 RTFREE_LOCKED(rt);
836 }
837 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]);
838 }
839 }
840
841 int
842 in6_get_tmpifid(ifp, retbuf, baseid, generate)
843 struct ifnet *ifp;
844 u_int8_t *retbuf;
845 const u_int8_t *baseid;
846 int generate;
847 {
848 u_int8_t nullbuf[8];
849 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
850
851 bzero(nullbuf, sizeof(nullbuf));
852 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
853 /* we've never created a random ID. Create a new one. */
854 generate = 1;
855 }
856
857 if (generate) {
858 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
859
860 /* generate_tmp_ifid will update seedn and buf */
861 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
862 ndi->randomid);
863 }
864 bcopy(ndi->randomid, retbuf, 8);
865
866 return (0);
867 }
868
869 void
870 in6_tmpaddrtimer(ignored_arg)
871 void *ignored_arg;
872 {
873 struct nd_ifinfo *ndi;
874 u_int8_t nullbuf[8];
875 struct ifnet *ifp;
876 int s = splnet();
877
878 callout_reset(&in6_tmpaddrtimer_ch,
879 (ip6_temp_preferred_lifetime - ip6_desync_factor -
880 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
881
882 bzero(nullbuf, sizeof(nullbuf));
883 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
884 ndi = ND_IFINFO(ifp);
885 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
886 /*
887 * We've been generating a random ID on this interface.
888 * Create a new one.
889 */
890 (void)generate_tmp_ifid(ndi->randomseed0,
891 ndi->randomseed1, ndi->randomid);
892 }
893 }
894
895 splx(s);
896 }
Cache object: c29c5f73d676b1635d924ffd7e312dee
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