1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/in6_ifattach.c 182649 2008-09-01 22:57:56Z obrien $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
38 #include <sys/socket.h>
39 #include <sys/sockio.h>
40 #include <sys/kernel.h>
41 #include <sys/syslog.h>
42 #include <sys/md5.h>
43
44 #include <net/if.h>
45 #include <net/if_dl.h>
46 #include <net/if_types.h>
47 #include <net/route.h>
48
49 #include <netinet/in.h>
50 #include <netinet/in_var.h>
51 #include <netinet/if_ether.h>
52 #include <netinet/in_pcb.h>
53
54 #include <netinet/ip6.h>
55 #include <netinet6/ip6_var.h>
56 #include <netinet6/in6_var.h>
57 #include <netinet6/in6_pcb.h>
58 #include <netinet6/in6_ifattach.h>
59 #include <netinet6/ip6_var.h>
60 #include <netinet6/nd6.h>
61 #include <netinet6/scope6_var.h>
62
63 #include <net/net_osdep.h>
64
65 unsigned long in6_maxmtu = 0;
66
67 #ifdef IP6_AUTO_LINKLOCAL
68 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
69 #else
70 int ip6_auto_linklocal = 1; /* enable by default */
71 #endif
72
73 struct callout in6_tmpaddrtimer_ch;
74
75 extern struct inpcbinfo udbinfo;
76 extern struct inpcbinfo ripcbinfo;
77
78 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
79 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
80 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
81 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
82 static int in6_ifattach_loopback(struct ifnet *);
83
84 #define EUI64_GBIT 0x01
85 #define EUI64_UBIT 0x02
86 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
87 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
88 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
89 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
90 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
91
92 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
93 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
94
95 /*
96 * Generate a last-resort interface identifier, when the machine has no
97 * IEEE802/EUI64 address sources.
98 * The goal here is to get an interface identifier that is
99 * (1) random enough and (2) does not change across reboot.
100 * We currently use MD5(hostname) for it.
101 */
102 static int
103 get_rand_ifid(ifp, in6)
104 struct ifnet *ifp;
105 struct in6_addr *in6; /* upper 64bits are preserved */
106 {
107 MD5_CTX ctxt;
108 u_int8_t digest[16];
109 int hostnamelen = strlen(hostname);
110
111 #if 0
112 /* we need at least several letters as seed for ifid */
113 if (hostnamelen < 3)
114 return -1;
115 #endif
116
117 /* generate 8 bytes of pseudo-random value. */
118 bzero(&ctxt, sizeof(ctxt));
119 MD5Init(&ctxt);
120 MD5Update(&ctxt, hostname, hostnamelen);
121 MD5Final(digest, &ctxt);
122
123 /* assumes sizeof(digest) > sizeof(ifid) */
124 bcopy(digest, &in6->s6_addr[8], 8);
125
126 /* make sure to set "u" bit to local, and "g" bit to individual. */
127 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
128 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
129
130 /* convert EUI64 into IPv6 interface identifier */
131 EUI64_TO_IFID(in6);
132
133 return 0;
134 }
135
136 static int
137 generate_tmp_ifid(seed0, seed1, ret)
138 u_int8_t *seed0, *ret;
139 const u_int8_t *seed1;
140 {
141 MD5_CTX ctxt;
142 u_int8_t seed[16], digest[16], nullbuf[8];
143 u_int32_t val32;
144
145 /* If there's no hisotry, start with a random seed. */
146 bzero(nullbuf, sizeof(nullbuf));
147 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
148 int i;
149
150 for (i = 0; i < 2; i++) {
151 val32 = arc4random();
152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
153 }
154 } else
155 bcopy(seed0, seed, 8);
156
157 /* copy the right-most 64-bits of the given address */
158 /* XXX assumption on the size of IFID */
159 bcopy(seed1, &seed[8], 8);
160
161 if (0) { /* for debugging purposes only */
162 int i;
163
164 printf("generate_tmp_ifid: new randomized ID from: ");
165 for (i = 0; i < 16; i++)
166 printf("%02x", seed[i]);
167 printf(" ");
168 }
169
170 /* generate 16 bytes of pseudo-random value. */
171 bzero(&ctxt, sizeof(ctxt));
172 MD5Init(&ctxt);
173 MD5Update(&ctxt, seed, sizeof(seed));
174 MD5Final(digest, &ctxt);
175
176 /*
177 * RFC 3041 3.2.1. (3)
178 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
179 * left-most bit is numbered 0) to zero.
180 */
181 bcopy(digest, ret, 8);
182 ret[0] &= ~EUI64_UBIT;
183
184 /*
185 * XXX: we'd like to ensure that the generated value is not zero
186 * for simplicity. If the caclculated digest happens to be zero,
187 * use a random non-zero value as the last resort.
188 */
189 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
190 nd6log((LOG_INFO,
191 "generate_tmp_ifid: computed MD5 value is zero.\n"));
192
193 val32 = arc4random();
194 val32 = 1 + (val32 % (0xffffffff - 1));
195 }
196
197 /*
198 * RFC 3041 3.2.1. (4)
199 * Take the rightmost 64-bits of the MD5 digest and save them in
200 * stable storage as the history value to be used in the next
201 * iteration of the algorithm.
202 */
203 bcopy(&digest[8], seed0, 8);
204
205 if (0) { /* for debugging purposes only */
206 int i;
207
208 printf("to: ");
209 for (i = 0; i < 16; i++)
210 printf("%02x", digest[i]);
211 printf("\n");
212 }
213
214 return 0;
215 }
216
217 /*
218 * Get interface identifier for the specified interface.
219 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
220 */
221 int
222 in6_get_hw_ifid(ifp, in6)
223 struct ifnet *ifp;
224 struct in6_addr *in6; /* upper 64bits are preserved */
225 {
226 struct ifaddr *ifa;
227 struct sockaddr_dl *sdl;
228 u_int8_t *addr;
229 size_t addrlen;
230 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
231 static u_int8_t allone[8] =
232 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
233
234 for (ifa = ifp->if_addrlist.tqh_first;
235 ifa;
236 ifa = ifa->ifa_list.tqe_next) {
237 if (ifa->ifa_addr->sa_family != AF_LINK)
238 continue;
239 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
240 if (sdl == NULL)
241 continue;
242 if (sdl->sdl_alen == 0)
243 continue;
244
245 goto found;
246 }
247
248 return -1;
249
250 found:
251 addr = LLADDR(sdl);
252 addrlen = sdl->sdl_alen;
253
254 /* get EUI64 */
255 switch (ifp->if_type) {
256 case IFT_ETHER:
257 case IFT_FDDI:
258 case IFT_ISO88025:
259 case IFT_ATM:
260 case IFT_IEEE1394:
261 #ifdef IFT_IEEE80211
262 case IFT_IEEE80211:
263 #endif
264 /* IEEE802/EUI64 cases - what others? */
265 /* IEEE1394 uses 16byte length address starting with EUI64 */
266 if (addrlen > 8)
267 addrlen = 8;
268
269 /* look at IEEE802/EUI64 only */
270 if (addrlen != 8 && addrlen != 6)
271 return -1;
272
273 /*
274 * check for invalid MAC address - on bsdi, we see it a lot
275 * since wildboar configures all-zero MAC on pccard before
276 * card insertion.
277 */
278 if (bcmp(addr, allzero, addrlen) == 0)
279 return -1;
280 if (bcmp(addr, allone, addrlen) == 0)
281 return -1;
282
283 /* make EUI64 address */
284 if (addrlen == 8)
285 bcopy(addr, &in6->s6_addr[8], 8);
286 else if (addrlen == 6) {
287 in6->s6_addr[8] = addr[0];
288 in6->s6_addr[9] = addr[1];
289 in6->s6_addr[10] = addr[2];
290 in6->s6_addr[11] = 0xff;
291 in6->s6_addr[12] = 0xfe;
292 in6->s6_addr[13] = addr[3];
293 in6->s6_addr[14] = addr[4];
294 in6->s6_addr[15] = addr[5];
295 }
296 break;
297
298 case IFT_ARCNET:
299 if (addrlen != 1)
300 return -1;
301 if (!addr[0])
302 return -1;
303
304 bzero(&in6->s6_addr[8], 8);
305 in6->s6_addr[15] = addr[0];
306
307 /*
308 * due to insufficient bitwidth, we mark it local.
309 */
310 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
311 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
312 break;
313
314 case IFT_GIF:
315 #ifdef IFT_STF
316 case IFT_STF:
317 #endif
318 /*
319 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
320 * however, IPv4 address is not very suitable as unique
321 * identifier source (can be renumbered).
322 * we don't do this.
323 */
324 return -1;
325
326 default:
327 return -1;
328 }
329
330 /* sanity check: g bit must not indicate "group" */
331 if (EUI64_GROUP(in6))
332 return -1;
333
334 /* convert EUI64 into IPv6 interface identifier */
335 EUI64_TO_IFID(in6);
336
337 /*
338 * sanity check: ifid must not be all zero, avoid conflict with
339 * subnet router anycast
340 */
341 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
342 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
343 return -1;
344 }
345
346 return 0;
347 }
348
349 /*
350 * Get interface identifier for the specified interface. If it is not
351 * available on ifp0, borrow interface identifier from other information
352 * sources.
353 */
354 static int
355 get_ifid(ifp0, altifp, in6)
356 struct ifnet *ifp0;
357 struct ifnet *altifp; /* secondary EUI64 source */
358 struct in6_addr *in6;
359 {
360 struct ifnet *ifp;
361
362 /* first, try to get it from the interface itself */
363 if (in6_get_hw_ifid(ifp0, in6) == 0) {
364 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
365 if_name(ifp0)));
366 goto success;
367 }
368
369 /* try secondary EUI64 source. this basically is for ATM PVC */
370 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
371 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
372 if_name(ifp0), if_name(altifp)));
373 goto success;
374 }
375
376 /* next, try to get it from some other hardware interface */
377 IFNET_RLOCK();
378 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
379 if (ifp == ifp0)
380 continue;
381 if (in6_get_hw_ifid(ifp, in6) != 0)
382 continue;
383
384 /*
385 * to borrow ifid from other interface, ifid needs to be
386 * globally unique
387 */
388 if (IFID_UNIVERSAL(in6)) {
389 nd6log((LOG_DEBUG,
390 "%s: borrow interface identifier from %s\n",
391 if_name(ifp0), if_name(ifp)));
392 IFNET_RUNLOCK();
393 goto success;
394 }
395 }
396 IFNET_RUNLOCK();
397
398 /* last resort: get from random number source */
399 if (get_rand_ifid(ifp, in6) == 0) {
400 nd6log((LOG_DEBUG,
401 "%s: interface identifier generated by random number\n",
402 if_name(ifp0)));
403 goto success;
404 }
405
406 printf("%s: failed to get interface identifier\n", if_name(ifp0));
407 return -1;
408
409 success:
410 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
411 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
412 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
413 in6->s6_addr[14], in6->s6_addr[15]));
414 return 0;
415 }
416
417 static int
418 in6_ifattach_linklocal(ifp, altifp)
419 struct ifnet *ifp;
420 struct ifnet *altifp; /* secondary EUI64 source */
421 {
422 struct in6_ifaddr *ia;
423 struct in6_aliasreq ifra;
424 struct nd_prefixctl pr0;
425 int i, error;
426
427 /*
428 * configure link-local address.
429 */
430 bzero(&ifra, sizeof(ifra));
431
432 /*
433 * in6_update_ifa() does not use ifra_name, but we accurately set it
434 * for safety.
435 */
436 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
437
438 ifra.ifra_addr.sin6_family = AF_INET6;
439 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
440 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
441 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
442 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
443 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
444 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
445 } else {
446 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
447 nd6log((LOG_ERR,
448 "%s: no ifid available\n", if_name(ifp)));
449 return (-1);
450 }
451 }
452 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
453 return (-1);
454
455 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
456 ifra.ifra_prefixmask.sin6_family = AF_INET6;
457 ifra.ifra_prefixmask.sin6_addr = in6mask64;
458 /* link-local addresses should NEVER expire. */
459 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
460 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
461
462 /*
463 * Now call in6_update_ifa() to do a bunch of procedures to configure
464 * a link-local address. We can set the 3rd argument to NULL, because
465 * we know there's no other link-local address on the interface
466 * and therefore we are adding one (instead of updating one).
467 */
468 if ((error = in6_update_ifa(ifp, &ifra, NULL,
469 IN6_IFAUPDATE_DADDELAY)) != 0) {
470 /*
471 * XXX: When the interface does not support IPv6, this call
472 * would fail in the SIOCSIFADDR ioctl. I believe the
473 * notification is rather confusing in this case, so just
474 * suppress it. (jinmei@kame.net 20010130)
475 */
476 if (error != EAFNOSUPPORT)
477 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
478 "configure a link-local address on %s "
479 "(errno=%d)\n",
480 if_name(ifp), error));
481 return (-1);
482 }
483
484 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
485 #ifdef DIAGNOSTIC
486 if (!ia) {
487 panic("ia == NULL in in6_ifattach_linklocal");
488 /* NOTREACHED */
489 }
490 #endif
491
492 /*
493 * Make the link-local prefix (fe80::%link/64) as on-link.
494 * Since we'd like to manage prefixes separately from addresses,
495 * we make an ND6 prefix structure for the link-local prefix,
496 * and add it to the prefix list as a never-expire prefix.
497 * XXX: this change might affect some existing code base...
498 */
499 bzero(&pr0, sizeof(pr0));
500 pr0.ndpr_ifp = ifp;
501 /* this should be 64 at this moment. */
502 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
503 pr0.ndpr_prefix = ifra.ifra_addr;
504 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
505 for (i = 0; i < 4; i++) {
506 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
507 in6mask64.s6_addr32[i];
508 }
509 /*
510 * Initialize parameters. The link-local prefix must always be
511 * on-link, and its lifetimes never expire.
512 */
513 pr0.ndpr_raf_onlink = 1;
514 pr0.ndpr_raf_auto = 1; /* probably meaningless */
515 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
516 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
517 /*
518 * Since there is no other link-local addresses, nd6_prefix_lookup()
519 * probably returns NULL. However, we cannot always expect the result.
520 * For example, if we first remove the (only) existing link-local
521 * address, and then reconfigure another one, the prefix is still
522 * valid with referring to the old link-local address.
523 */
524 if (nd6_prefix_lookup(&pr0) == NULL) {
525 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
526 return (error);
527 }
528
529 return 0;
530 }
531
532 static int
533 in6_ifattach_loopback(ifp)
534 struct ifnet *ifp; /* must be IFT_LOOP */
535 {
536 struct in6_aliasreq ifra;
537 int error;
538
539 bzero(&ifra, sizeof(ifra));
540
541 /*
542 * in6_update_ifa() does not use ifra_name, but we accurately set it
543 * for safety.
544 */
545 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
546
547 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
548 ifra.ifra_prefixmask.sin6_family = AF_INET6;
549 ifra.ifra_prefixmask.sin6_addr = in6mask128;
550
551 /*
552 * Always initialize ia_dstaddr (= broadcast address) to loopback
553 * address. Follows IPv4 practice - see in_ifinit().
554 */
555 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
556 ifra.ifra_dstaddr.sin6_family = AF_INET6;
557 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
558
559 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
560 ifra.ifra_addr.sin6_family = AF_INET6;
561 ifra.ifra_addr.sin6_addr = in6addr_loopback;
562
563 /* the loopback address should NEVER expire. */
564 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
565 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
566
567 /* we don't need to perform DAD on loopback interfaces. */
568 ifra.ifra_flags |= IN6_IFF_NODAD;
569
570 /* skip registration to the prefix list. XXX should be temporary. */
571 ifra.ifra_flags |= IN6_IFF_NOPFX;
572
573 /*
574 * We are sure that this is a newly assigned address, so we can set
575 * NULL to the 3rd arg.
576 */
577 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
578 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
579 "the loopback address on %s (errno=%d)\n",
580 if_name(ifp), error));
581 return (-1);
582 }
583
584 return 0;
585 }
586
587 /*
588 * compute NI group address, based on the current hostname setting.
589 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
590 *
591 * when ifp == NULL, the caller is responsible for filling scopeid.
592 */
593 int
594 in6_nigroup(ifp, name, namelen, in6)
595 struct ifnet *ifp;
596 const char *name;
597 int namelen;
598 struct in6_addr *in6;
599 {
600 const char *p;
601 u_char *q;
602 MD5_CTX ctxt;
603 u_int8_t digest[16];
604 char l;
605 char n[64]; /* a single label must not exceed 63 chars */
606
607 if (!namelen || !name)
608 return -1;
609
610 p = name;
611 while (p && *p && *p != '.' && p - name < namelen)
612 p++;
613 if (p - name > sizeof(n) - 1)
614 return -1; /* label too long */
615 l = p - name;
616 strncpy(n, name, l);
617 n[(int)l] = '\0';
618 for (q = n; *q; q++) {
619 if ('A' <= *q && *q <= 'Z')
620 *q = *q - 'A' + 'a';
621 }
622
623 /* generate 8 bytes of pseudo-random value. */
624 bzero(&ctxt, sizeof(ctxt));
625 MD5Init(&ctxt);
626 MD5Update(&ctxt, &l, sizeof(l));
627 MD5Update(&ctxt, n, l);
628 MD5Final(digest, &ctxt);
629
630 bzero(in6, sizeof(*in6));
631 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
632 in6->s6_addr8[11] = 2;
633 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
634 if (in6_setscope(in6, ifp, NULL))
635 return (-1); /* XXX: should not fail */
636
637 return 0;
638 }
639
640 /*
641 * XXX multiple loopback interface needs more care. for instance,
642 * nodelocal address needs to be configured onto only one of them.
643 * XXX multiple link-local address case
644 */
645 void
646 in6_ifattach(ifp, altifp)
647 struct ifnet *ifp;
648 struct ifnet *altifp; /* secondary EUI64 source */
649 {
650 struct in6_ifaddr *ia;
651 struct in6_addr in6;
652
653 /* some of the interfaces are inherently not IPv6 capable */
654 switch (ifp->if_type) {
655 case IFT_PFLOG:
656 case IFT_PFSYNC:
657 case IFT_CARP:
658 return;
659 }
660
661 /*
662 * quirks based on interface type
663 */
664 switch (ifp->if_type) {
665 #ifdef IFT_STF
666 case IFT_STF:
667 /*
668 * 6to4 interface is a very special kind of beast.
669 * no multicast, no linklocal. RFC2529 specifies how to make
670 * linklocals for 6to4 interface, but there's no use and
671 * it is rather harmful to have one.
672 */
673 goto statinit;
674 #endif
675 default:
676 break;
677 }
678
679 /*
680 * usually, we require multicast capability to the interface
681 */
682 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
683 nd6log((LOG_INFO, "in6_ifattach: "
684 "%s is not multicast capable, IPv6 not enabled\n",
685 if_name(ifp)));
686 return;
687 }
688
689 /*
690 * assign loopback address for loopback interface.
691 * XXX multiple loopback interface case.
692 */
693 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
694 in6 = in6addr_loopback;
695 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
696 if (in6_ifattach_loopback(ifp) != 0)
697 return;
698 }
699 }
700
701 /*
702 * assign a link-local address, if there's none.
703 */
704 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
705 ia = in6ifa_ifpforlinklocal(ifp, 0);
706 if (ia == NULL) {
707 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
708 /* linklocal address assigned */
709 } else {
710 /* failed to assign linklocal address. bark? */
711 }
712 }
713 }
714
715 #ifdef IFT_STF /* XXX */
716 statinit:
717 #endif
718
719 /* update dynamically. */
720 if (in6_maxmtu < ifp->if_mtu)
721 in6_maxmtu = ifp->if_mtu;
722 }
723
724 /*
725 * NOTE: in6_ifdetach() does not support loopback if at this moment.
726 * We don't need this function in bsdi, because interfaces are never removed
727 * from the ifnet list in bsdi.
728 */
729 void
730 in6_ifdetach(ifp)
731 struct ifnet *ifp;
732 {
733 struct in6_ifaddr *ia, *oia;
734 struct ifaddr *ifa, *next;
735 struct rtentry *rt;
736 short rtflags;
737 struct sockaddr_in6 sin6;
738 struct in6_multi *in6m, *in6m_next;
739 struct in6_multi_mship *imm;
740
741 /* remove neighbor management table */
742 nd6_purge(ifp);
743
744 /* nuke any of IPv6 addresses we have */
745 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
746 next = ifa->ifa_list.tqe_next;
747 if (ifa->ifa_addr->sa_family != AF_INET6)
748 continue;
749 in6_purgeaddr(ifa);
750 }
751
752 /* undo everything done by in6_ifattach(), just in case */
753 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
754 next = ifa->ifa_list.tqe_next;
755
756 if (ifa->ifa_addr->sa_family != AF_INET6
757 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
758 continue;
759 }
760
761 ia = (struct in6_ifaddr *)ifa;
762
763 /*
764 * leave from multicast groups we have joined for the interface
765 */
766 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
767 LIST_REMOVE(imm, i6mm_chain);
768 in6_leavegroup(imm);
769 }
770
771 /* remove from the routing table */
772 if ((ia->ia_flags & IFA_ROUTE) &&
773 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
774 rtflags = rt->rt_flags;
775 rtfree(rt);
776 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
777 (struct sockaddr *)&ia->ia_addr,
778 (struct sockaddr *)&ia->ia_prefixmask,
779 rtflags, (struct rtentry **)0);
780 }
781
782 /* remove from the linked list */
783 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
784 IFAFREE(&ia->ia_ifa);
785
786 /* also remove from the IPv6 address chain(itojun&jinmei) */
787 oia = ia;
788 if (oia == (ia = in6_ifaddr))
789 in6_ifaddr = ia->ia_next;
790 else {
791 while (ia->ia_next && (ia->ia_next != oia))
792 ia = ia->ia_next;
793 if (ia->ia_next)
794 ia->ia_next = oia->ia_next;
795 else {
796 nd6log((LOG_ERR,
797 "%s: didn't unlink in6ifaddr from list\n",
798 if_name(ifp)));
799 }
800 }
801
802 IFAFREE(&oia->ia_ifa);
803 }
804
805 /* leave from all multicast groups joined */
806
807 if (udbinfo.listhead != NULL)
808 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp);
809 if (ripcbinfo.listhead != NULL)
810 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp);
811
812 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
813 in6m_next = LIST_NEXT(in6m, in6m_entry);
814 if (in6m->in6m_ifp != ifp)
815 continue;
816 printf("in6_ifdetach: in6m=%p (ref=%d), ifp=%p\n", in6m,
817 in6m->in6m_ifma->ifma_refcount, ifp);
818 in6_delmulti(in6m);
819 in6m = NULL;
820 }
821
822 /*
823 * remove neighbor management table. we call it twice just to make
824 * sure we nuke everything. maybe we need just one call.
825 * XXX: since the first call did not release addresses, some prefixes
826 * might remain. We should call nd6_purge() again to release the
827 * prefixes after removing all addresses above.
828 * (Or can we just delay calling nd6_purge until at this point?)
829 */
830 nd6_purge(ifp);
831
832 /* remove route to link-local allnodes multicast (ff02::1) */
833 bzero(&sin6, sizeof(sin6));
834 sin6.sin6_len = sizeof(struct sockaddr_in6);
835 sin6.sin6_family = AF_INET6;
836 sin6.sin6_addr = in6addr_linklocal_allnodes;
837 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
838 /* XXX: should not fail */
839 return;
840 /* XXX grab lock first to avoid LOR */
841 if (rt_tables[AF_INET6] != NULL) {
842 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]);
843 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
844 if (rt) {
845 if (rt->rt_ifp == ifp)
846 rtexpunge(rt);
847 RTFREE_LOCKED(rt);
848 }
849 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]);
850 }
851 }
852
853 int
854 in6_get_tmpifid(ifp, retbuf, baseid, generate)
855 struct ifnet *ifp;
856 u_int8_t *retbuf;
857 const u_int8_t *baseid;
858 int generate;
859 {
860 u_int8_t nullbuf[8];
861 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
862
863 bzero(nullbuf, sizeof(nullbuf));
864 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
865 /* we've never created a random ID. Create a new one. */
866 generate = 1;
867 }
868
869 if (generate) {
870 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
871
872 /* generate_tmp_ifid will update seedn and buf */
873 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
874 ndi->randomid);
875 }
876 bcopy(ndi->randomid, retbuf, 8);
877
878 return (0);
879 }
880
881 void
882 in6_tmpaddrtimer(ignored_arg)
883 void *ignored_arg;
884 {
885 struct nd_ifinfo *ndi;
886 u_int8_t nullbuf[8];
887 struct ifnet *ifp;
888 int s = splnet();
889
890 callout_reset(&in6_tmpaddrtimer_ch,
891 (ip6_temp_preferred_lifetime - ip6_desync_factor -
892 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
893
894 bzero(nullbuf, sizeof(nullbuf));
895 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
896 ndi = ND_IFINFO(ifp);
897 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
898 /*
899 * We've been generating a random ID on this interface.
900 * Create a new one.
901 */
902 (void)generate_tmp_ifid(ndi->randomseed0,
903 ndi->randomseed1, ndi->randomid);
904 }
905 }
906
907 splx(s);
908 }
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