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: src/sys/netinet6/in6_ifattach.c,v 1.51 2008/12/02 21:37:28 bz Exp $");
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 #include <sys/vimage.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 #include <net/vnet.h>
50
51 #include <netinet/in.h>
52 #include <netinet/in_var.h>
53 #include <netinet/if_ether.h>
54 #include <netinet/in_pcb.h>
55 #include <netinet/vinet.h>
56
57 #include <netinet/ip6.h>
58 #include <netinet6/ip6_var.h>
59 #include <netinet6/in6_var.h>
60 #include <netinet6/in6_pcb.h>
61 #include <netinet6/in6_ifattach.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/nd6.h>
64 #include <netinet6/scope6_var.h>
65 #include <netinet6/vinet6.h>
66
67 #ifdef VIMAGE_GLOBALS
68 unsigned long in6_maxmtu;
69 int ip6_auto_linklocal;
70 struct callout in6_tmpaddrtimer_ch;
71 extern struct inpcbinfo ripcbinfo;
72 #endif
73
74 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
75 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
76 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
77 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
78 static int in6_ifattach_loopback(struct ifnet *);
79 static void in6_purgemaddrs(struct ifnet *);
80
81 #define EUI64_GBIT 0x01
82 #define EUI64_UBIT 0x02
83 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
84 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
85 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
86 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
87 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
88
89 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
90 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
91
92 /*
93 * Generate a last-resort interface identifier, when the machine has no
94 * IEEE802/EUI64 address sources.
95 * The goal here is to get an interface identifier that is
96 * (1) random enough and (2) does not change across reboot.
97 * We currently use MD5(hostname) for it.
98 *
99 * in6 - upper 64bits are preserved
100 */
101 static int
102 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
103 {
104 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */
105 MD5_CTX ctxt;
106 u_int8_t digest[16];
107 int hostnamelen;
108
109 mtx_lock(&hostname_mtx);
110 hostnamelen = strlen(V_hostname);
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, V_hostname, hostnamelen);
121 mtx_unlock(&hostname_mtx);
122 MD5Final(digest, &ctxt);
123
124 /* assumes sizeof(digest) > sizeof(ifid) */
125 bcopy(digest, &in6->s6_addr[8], 8);
126
127 /* make sure to set "u" bit to local, and "g" bit to individual. */
128 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
129 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
130
131 /* convert EUI64 into IPv6 interface identifier */
132 EUI64_TO_IFID(in6);
133
134 return 0;
135 }
136
137 static int
138 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
139 {
140 INIT_VNET_INET6(curvnet);
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 history, 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 * in6 - upper 64bits are preserved
222 */
223 int
224 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
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 * altifp - secondary EUI64 source
355 */
356 static int
357 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
358 struct in6_addr *in6)
359 {
360 INIT_VNET_NET(ifp0->if_vnet);
361 INIT_VNET_INET6(ifp0->if_vnet);
362 struct ifnet *ifp;
363
364 /* first, try to get it from the interface itself */
365 if (in6_get_hw_ifid(ifp0, in6) == 0) {
366 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
367 if_name(ifp0)));
368 goto success;
369 }
370
371 /* try secondary EUI64 source. this basically is for ATM PVC */
372 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
373 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
374 if_name(ifp0), if_name(altifp)));
375 goto success;
376 }
377
378 /* next, try to get it from some other hardware interface */
379 IFNET_RLOCK();
380 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
381 if (ifp == ifp0)
382 continue;
383 if (in6_get_hw_ifid(ifp, in6) != 0)
384 continue;
385
386 /*
387 * to borrow ifid from other interface, ifid needs to be
388 * globally unique
389 */
390 if (IFID_UNIVERSAL(in6)) {
391 nd6log((LOG_DEBUG,
392 "%s: borrow interface identifier from %s\n",
393 if_name(ifp0), if_name(ifp)));
394 IFNET_RUNLOCK();
395 goto success;
396 }
397 }
398 IFNET_RUNLOCK();
399
400 /* last resort: get from random number source */
401 if (get_rand_ifid(ifp, in6) == 0) {
402 nd6log((LOG_DEBUG,
403 "%s: interface identifier generated by random number\n",
404 if_name(ifp0)));
405 goto success;
406 }
407
408 printf("%s: failed to get interface identifier\n", if_name(ifp0));
409 return -1;
410
411 success:
412 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
413 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
414 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
415 in6->s6_addr[14], in6->s6_addr[15]));
416 return 0;
417 }
418
419 /*
420 * altifp - secondary EUI64 source
421 */
422 static int
423 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
424 {
425 INIT_VNET_INET6(curvnet);
426 struct in6_ifaddr *ia;
427 struct in6_aliasreq ifra;
428 struct nd_prefixctl pr0;
429 int i, error;
430
431 /*
432 * configure link-local address.
433 */
434 bzero(&ifra, sizeof(ifra));
435
436 /*
437 * in6_update_ifa() does not use ifra_name, but we accurately set it
438 * for safety.
439 */
440 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
441
442 ifra.ifra_addr.sin6_family = AF_INET6;
443 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
444 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
445 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
446 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
447 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
448 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
449 } else {
450 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
451 nd6log((LOG_ERR,
452 "%s: no ifid available\n", if_name(ifp)));
453 return (-1);
454 }
455 }
456 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
457 return (-1);
458
459 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
460 ifra.ifra_prefixmask.sin6_family = AF_INET6;
461 ifra.ifra_prefixmask.sin6_addr = in6mask64;
462 /* link-local addresses should NEVER expire. */
463 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
464 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
465
466 /*
467 * Now call in6_update_ifa() to do a bunch of procedures to configure
468 * a link-local address. We can set the 3rd argument to NULL, because
469 * we know there's no other link-local address on the interface
470 * and therefore we are adding one (instead of updating one).
471 */
472 if ((error = in6_update_ifa(ifp, &ifra, NULL,
473 IN6_IFAUPDATE_DADDELAY)) != 0) {
474 /*
475 * XXX: When the interface does not support IPv6, this call
476 * would fail in the SIOCSIFADDR ioctl. I believe the
477 * notification is rather confusing in this case, so just
478 * suppress it. (jinmei@kame.net 20010130)
479 */
480 if (error != EAFNOSUPPORT)
481 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
482 "configure a link-local address on %s "
483 "(errno=%d)\n",
484 if_name(ifp), error));
485 return (-1);
486 }
487
488 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
489 #ifdef DIAGNOSTIC
490 if (!ia) {
491 panic("ia == NULL in in6_ifattach_linklocal");
492 /* NOTREACHED */
493 }
494 #endif
495
496 /*
497 * Make the link-local prefix (fe80::%link/64) as on-link.
498 * Since we'd like to manage prefixes separately from addresses,
499 * we make an ND6 prefix structure for the link-local prefix,
500 * and add it to the prefix list as a never-expire prefix.
501 * XXX: this change might affect some existing code base...
502 */
503 bzero(&pr0, sizeof(pr0));
504 pr0.ndpr_ifp = ifp;
505 /* this should be 64 at this moment. */
506 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
507 pr0.ndpr_prefix = ifra.ifra_addr;
508 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
509 for (i = 0; i < 4; i++) {
510 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
511 in6mask64.s6_addr32[i];
512 }
513 /*
514 * Initialize parameters. The link-local prefix must always be
515 * on-link, and its lifetimes never expire.
516 */
517 pr0.ndpr_raf_onlink = 1;
518 pr0.ndpr_raf_auto = 1; /* probably meaningless */
519 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
520 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
521 /*
522 * Since there is no other link-local addresses, nd6_prefix_lookup()
523 * probably returns NULL. However, we cannot always expect the result.
524 * For example, if we first remove the (only) existing link-local
525 * address, and then reconfigure another one, the prefix is still
526 * valid with referring to the old link-local address.
527 */
528 if (nd6_prefix_lookup(&pr0) == NULL) {
529 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
530 return (error);
531 }
532
533 return 0;
534 }
535
536 /*
537 * ifp - must be IFT_LOOP
538 */
539 static int
540 in6_ifattach_loopback(struct ifnet *ifp)
541 {
542 INIT_VNET_INET6(curvnet);
543 struct in6_aliasreq ifra;
544 int error;
545
546 bzero(&ifra, sizeof(ifra));
547
548 /*
549 * in6_update_ifa() does not use ifra_name, but we accurately set it
550 * for safety.
551 */
552 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
553
554 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
555 ifra.ifra_prefixmask.sin6_family = AF_INET6;
556 ifra.ifra_prefixmask.sin6_addr = in6mask128;
557
558 /*
559 * Always initialize ia_dstaddr (= broadcast address) to loopback
560 * address. Follows IPv4 practice - see in_ifinit().
561 */
562 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
563 ifra.ifra_dstaddr.sin6_family = AF_INET6;
564 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
565
566 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
567 ifra.ifra_addr.sin6_family = AF_INET6;
568 ifra.ifra_addr.sin6_addr = in6addr_loopback;
569
570 /* the loopback address should NEVER expire. */
571 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
572 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
573
574 /* we don't need to perform DAD on loopback interfaces. */
575 ifra.ifra_flags |= IN6_IFF_NODAD;
576
577 /* skip registration to the prefix list. XXX should be temporary. */
578 ifra.ifra_flags |= IN6_IFF_NOPFX;
579
580 /*
581 * We are sure that this is a newly assigned address, so we can set
582 * NULL to the 3rd arg.
583 */
584 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
585 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
586 "the loopback address on %s (errno=%d)\n",
587 if_name(ifp), error));
588 return (-1);
589 }
590
591 return 0;
592 }
593
594 /*
595 * compute NI group address, based on the current hostname setting.
596 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
597 *
598 * when ifp == NULL, the caller is responsible for filling scopeid.
599 */
600 int
601 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
602 struct in6_addr *in6)
603 {
604 const char *p;
605 u_char *q;
606 MD5_CTX ctxt;
607 u_int8_t digest[16];
608 char l;
609 char n[64]; /* a single label must not exceed 63 chars */
610
611 if (!namelen || !name)
612 return -1;
613
614 p = name;
615 while (p && *p && *p != '.' && p - name < namelen)
616 p++;
617 if (p - name > sizeof(n) - 1)
618 return -1; /* label too long */
619 l = p - name;
620 strncpy(n, name, l);
621 n[(int)l] = '\0';
622 for (q = n; *q; q++) {
623 if ('A' <= *q && *q <= 'Z')
624 *q = *q - 'A' + 'a';
625 }
626
627 /* generate 8 bytes of pseudo-random value. */
628 bzero(&ctxt, sizeof(ctxt));
629 MD5Init(&ctxt);
630 MD5Update(&ctxt, &l, sizeof(l));
631 MD5Update(&ctxt, n, l);
632 MD5Final(digest, &ctxt);
633
634 bzero(in6, sizeof(*in6));
635 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
636 in6->s6_addr8[11] = 2;
637 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
638 if (in6_setscope(in6, ifp, NULL))
639 return (-1); /* XXX: should not fail */
640
641 return 0;
642 }
643
644 /*
645 * XXX multiple loopback interface needs more care. for instance,
646 * nodelocal address needs to be configured onto only one of them.
647 * XXX multiple link-local address case
648 *
649 * altifp - secondary EUI64 source
650 */
651 void
652 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
653 {
654 INIT_VNET_INET6(ifp->if_vnet);
655 struct in6_ifaddr *ia;
656 struct in6_addr in6;
657
658 /* some of the interfaces are inherently not IPv6 capable */
659 switch (ifp->if_type) {
660 case IFT_PFLOG:
661 case IFT_PFSYNC:
662 case IFT_CARP:
663 return;
664 }
665
666 /*
667 * quirks based on interface type
668 */
669 switch (ifp->if_type) {
670 #ifdef IFT_STF
671 case IFT_STF:
672 /*
673 * 6to4 interface is a very special kind of beast.
674 * no multicast, no linklocal. RFC2529 specifies how to make
675 * linklocals for 6to4 interface, but there's no use and
676 * it is rather harmful to have one.
677 */
678 goto statinit;
679 #endif
680 default:
681 break;
682 }
683
684 /*
685 * usually, we require multicast capability to the interface
686 */
687 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
688 nd6log((LOG_INFO, "in6_ifattach: "
689 "%s is not multicast capable, IPv6 not enabled\n",
690 if_name(ifp)));
691 return;
692 }
693
694 /*
695 * assign loopback address for loopback interface.
696 * XXX multiple loopback interface case.
697 */
698 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
699 in6 = in6addr_loopback;
700 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
701 if (in6_ifattach_loopback(ifp) != 0)
702 return;
703 }
704 }
705
706 /*
707 * assign a link-local address, if there's none.
708 */
709 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
710 ia = in6ifa_ifpforlinklocal(ifp, 0);
711 if (ia == NULL) {
712 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
713 /* linklocal address assigned */
714 } else {
715 /* failed to assign linklocal address. bark? */
716 }
717 }
718 }
719
720 #ifdef IFT_STF /* XXX */
721 statinit:
722 #endif
723
724 /* update dynamically. */
725 if (V_in6_maxmtu < ifp->if_mtu)
726 V_in6_maxmtu = ifp->if_mtu;
727 }
728
729 /*
730 * NOTE: in6_ifdetach() does not support loopback if at this moment.
731 * We don't need this function in bsdi, because interfaces are never removed
732 * from the ifnet list in bsdi.
733 */
734 void
735 in6_ifdetach(struct ifnet *ifp)
736 {
737 INIT_VNET_NET(ifp->if_vnet);
738 INIT_VNET_INET(ifp->if_vnet);
739 INIT_VNET_INET6(ifp->if_vnet);
740 struct in6_ifaddr *ia, *oia;
741 struct ifaddr *ifa, *next;
742 struct rtentry *rt;
743 short rtflags;
744 struct sockaddr_in6 sin6;
745 struct in6_multi_mship *imm;
746
747 /* remove neighbor management table */
748 nd6_purge(ifp);
749
750 /* nuke any of IPv6 addresses we have */
751 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
752 next = ifa->ifa_list.tqe_next;
753 if (ifa->ifa_addr->sa_family != AF_INET6)
754 continue;
755 in6_purgeaddr(ifa);
756 }
757
758 /* undo everything done by in6_ifattach(), just in case */
759 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) {
760 next = ifa->ifa_list.tqe_next;
761
762 if (ifa->ifa_addr->sa_family != AF_INET6
763 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
764 continue;
765 }
766
767 ia = (struct in6_ifaddr *)ifa;
768
769 /*
770 * leave from multicast groups we have joined for the interface
771 */
772 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
773 LIST_REMOVE(imm, i6mm_chain);
774 in6_leavegroup(imm);
775 }
776
777 /* remove from the routing table */
778 if ((ia->ia_flags & IFA_ROUTE) &&
779 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
780 rtflags = rt->rt_flags;
781 rtfree(rt);
782 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
783 (struct sockaddr *)&ia->ia_addr,
784 (struct sockaddr *)&ia->ia_prefixmask,
785 rtflags, (struct rtentry **)0);
786 }
787
788 /* remove from the linked list */
789 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
790 IFAFREE(&ia->ia_ifa);
791
792 /* also remove from the IPv6 address chain(itojun&jinmei) */
793 oia = ia;
794 if (oia == (ia = V_in6_ifaddr))
795 V_in6_ifaddr = ia->ia_next;
796 else {
797 while (ia->ia_next && (ia->ia_next != oia))
798 ia = ia->ia_next;
799 if (ia->ia_next)
800 ia->ia_next = oia->ia_next;
801 else {
802 nd6log((LOG_ERR,
803 "%s: didn't unlink in6ifaddr from list\n",
804 if_name(ifp)));
805 }
806 }
807
808 IFAFREE(&oia->ia_ifa);
809 }
810
811 in6_pcbpurgeif0(&V_udbinfo, ifp);
812 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
813 /* leave from all multicast groups joined */
814 in6_purgemaddrs(ifp);
815
816 /*
817 * remove neighbor management table. we call it twice just to make
818 * sure we nuke everything. maybe we need just one call.
819 * XXX: since the first call did not release addresses, some prefixes
820 * might remain. We should call nd6_purge() again to release the
821 * prefixes after removing all addresses above.
822 * (Or can we just delay calling nd6_purge until at this point?)
823 */
824 nd6_purge(ifp);
825
826 /* remove route to link-local allnodes multicast (ff02::1) */
827 bzero(&sin6, sizeof(sin6));
828 sin6.sin6_len = sizeof(struct sockaddr_in6);
829 sin6.sin6_family = AF_INET6;
830 sin6.sin6_addr = in6addr_linklocal_allnodes;
831 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
832 /* XXX: should not fail */
833 return;
834 /* XXX grab lock first to avoid LOR */
835 if (V_rt_tables[0][AF_INET6] != NULL) {
836 RADIX_NODE_HEAD_LOCK(V_rt_tables[0][AF_INET6]);
837 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
838 if (rt) {
839 if (rt->rt_ifp == ifp)
840 rtexpunge(rt);
841 RTFREE_LOCKED(rt);
842 }
843 RADIX_NODE_HEAD_UNLOCK(V_rt_tables[0][AF_INET6]);
844 }
845 }
846
847 int
848 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
849 const u_int8_t *baseid, int generate)
850 {
851 u_int8_t nullbuf[8];
852 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
853
854 bzero(nullbuf, sizeof(nullbuf));
855 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
856 /* we've never created a random ID. Create a new one. */
857 generate = 1;
858 }
859
860 if (generate) {
861 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
862
863 /* generate_tmp_ifid will update seedn and buf */
864 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
865 ndi->randomid);
866 }
867 bcopy(ndi->randomid, retbuf, 8);
868
869 return (0);
870 }
871
872 void
873 in6_tmpaddrtimer(void *ignored_arg)
874 {
875 INIT_VNET_NET(curvnet);
876 INIT_VNET_INET6(curvnet);
877 struct nd_ifinfo *ndi;
878 u_int8_t nullbuf[8];
879 struct ifnet *ifp;
880
881 callout_reset(&V_in6_tmpaddrtimer_ch,
882 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
883 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL);
884
885 bzero(nullbuf, sizeof(nullbuf));
886 for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
887 ifp = TAILQ_NEXT(ifp, if_list)) {
888 ndi = ND_IFINFO(ifp);
889 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
890 /*
891 * We've been generating a random ID on this interface.
892 * Create a new one.
893 */
894 (void)generate_tmp_ifid(ndi->randomseed0,
895 ndi->randomseed1, ndi->randomid);
896 }
897 }
898
899 }
900
901 static void
902 in6_purgemaddrs(struct ifnet *ifp)
903 {
904 struct in6_multi *in6m;
905 struct in6_multi *oin6m;
906
907 #ifdef DIAGNOSTIC
908 printf("%s: purging ifp %p\n", __func__, ifp);
909 #endif
910
911 IFF_LOCKGIANT(ifp);
912 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) {
913 if (in6m->in6m_ifp == ifp)
914 in6_delmulti(in6m);
915 }
916 IFF_UNLOCKGIANT(ifp);
917 }
918
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