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/8.1/sys/netinet6/in6_ifattach.c 207695 2010-05-06 06:44:19Z bz $");
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/jail.h>
41 #include <sys/kernel.h>
42 #include <sys/proc.h>
43 #include <sys/syslog.h>
44 #include <sys/md5.h>
45
46 #include <net/if.h>
47 #include <net/if_dl.h>
48 #include <net/if_types.h>
49 #include <net/route.h>
50 #include <net/vnet.h>
51
52 #include <netinet/in.h>
53 #include <netinet/in_var.h>
54 #include <netinet/if_ether.h>
55 #include <netinet/in_pcb.h>
56 #include <netinet/ip_var.h>
57 #include <netinet/udp.h>
58 #include <netinet/udp_var.h>
59
60 #include <netinet/ip6.h>
61 #include <netinet6/ip6_var.h>
62 #include <netinet6/in6_var.h>
63 #include <netinet6/in6_pcb.h>
64 #include <netinet6/in6_ifattach.h>
65 #include <netinet6/ip6_var.h>
66 #include <netinet6/nd6.h>
67 #include <netinet6/mld6_var.h>
68 #include <netinet6/scope6_var.h>
69
70 VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
71
72 #ifdef IP6_AUTO_LINKLOCAL
73 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
74 #else
75 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
76 #endif
77
78 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
79 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
80
81 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
82 #define V_ripcbinfo VNET(ripcbinfo)
83
84 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
85 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
86 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
87 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
88 static int in6_ifattach_loopback(struct ifnet *);
89 static void in6_purgemaddrs(struct ifnet *);
90
91 #define EUI64_GBIT 0x01
92 #define EUI64_UBIT 0x02
93 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
94 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
95 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
96 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
97 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
98
99 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
100 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
101
102 /*
103 * Generate a last-resort interface identifier, when the machine has no
104 * IEEE802/EUI64 address sources.
105 * The goal here is to get an interface identifier that is
106 * (1) random enough and (2) does not change across reboot.
107 * We currently use MD5(hostname) for it.
108 *
109 * in6 - upper 64bits are preserved
110 */
111 static int
112 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
113 {
114 MD5_CTX ctxt;
115 struct prison *pr;
116 u_int8_t digest[16];
117 int hostnamelen;
118
119 pr = curthread->td_ucred->cr_prison;
120 mtx_lock(&pr->pr_mtx);
121 hostnamelen = strlen(pr->pr_hostname);
122 #if 0
123 /* we need at least several letters as seed for ifid */
124 if (hostnamelen < 3) {
125 mtx_unlock(&pr->pr_mtx);
126 return -1;
127 }
128 #endif
129
130 /* generate 8 bytes of pseudo-random value. */
131 bzero(&ctxt, sizeof(ctxt));
132 MD5Init(&ctxt);
133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
134 mtx_unlock(&pr->pr_mtx);
135 MD5Final(digest, &ctxt);
136
137 /* assumes sizeof(digest) > sizeof(ifid) */
138 bcopy(digest, &in6->s6_addr[8], 8);
139
140 /* make sure to set "u" bit to local, and "g" bit to individual. */
141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
143
144 /* convert EUI64 into IPv6 interface identifier */
145 EUI64_TO_IFID(in6);
146
147 return 0;
148 }
149
150 static int
151 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
152 {
153 MD5_CTX ctxt;
154 u_int8_t seed[16], digest[16], nullbuf[8];
155 u_int32_t val32;
156
157 /* If there's no history, start with a random seed. */
158 bzero(nullbuf, sizeof(nullbuf));
159 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
160 int i;
161
162 for (i = 0; i < 2; i++) {
163 val32 = arc4random();
164 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
165 }
166 } else
167 bcopy(seed0, seed, 8);
168
169 /* copy the right-most 64-bits of the given address */
170 /* XXX assumption on the size of IFID */
171 bcopy(seed1, &seed[8], 8);
172
173 if (0) { /* for debugging purposes only */
174 int i;
175
176 printf("generate_tmp_ifid: new randomized ID from: ");
177 for (i = 0; i < 16; i++)
178 printf("%02x", seed[i]);
179 printf(" ");
180 }
181
182 /* generate 16 bytes of pseudo-random value. */
183 bzero(&ctxt, sizeof(ctxt));
184 MD5Init(&ctxt);
185 MD5Update(&ctxt, seed, sizeof(seed));
186 MD5Final(digest, &ctxt);
187
188 /*
189 * RFC 3041 3.2.1. (3)
190 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
191 * left-most bit is numbered 0) to zero.
192 */
193 bcopy(digest, ret, 8);
194 ret[0] &= ~EUI64_UBIT;
195
196 /*
197 * XXX: we'd like to ensure that the generated value is not zero
198 * for simplicity. If the caclculated digest happens to be zero,
199 * use a random non-zero value as the last resort.
200 */
201 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
202 nd6log((LOG_INFO,
203 "generate_tmp_ifid: computed MD5 value is zero.\n"));
204
205 val32 = arc4random();
206 val32 = 1 + (val32 % (0xffffffff - 1));
207 }
208
209 /*
210 * RFC 3041 3.2.1. (4)
211 * Take the rightmost 64-bits of the MD5 digest and save them in
212 * stable storage as the history value to be used in the next
213 * iteration of the algorithm.
214 */
215 bcopy(&digest[8], seed0, 8);
216
217 if (0) { /* for debugging purposes only */
218 int i;
219
220 printf("to: ");
221 for (i = 0; i < 16; i++)
222 printf("%02x", digest[i]);
223 printf("\n");
224 }
225
226 return 0;
227 }
228
229 /*
230 * Get interface identifier for the specified interface.
231 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
232 *
233 * in6 - upper 64bits are preserved
234 */
235 int
236 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
237 {
238 struct ifaddr *ifa;
239 struct sockaddr_dl *sdl;
240 u_int8_t *addr;
241 size_t addrlen;
242 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
243 static u_int8_t allone[8] =
244 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
245
246 IF_ADDR_LOCK(ifp);
247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
248 if (ifa->ifa_addr->sa_family != AF_LINK)
249 continue;
250 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
251 if (sdl == NULL)
252 continue;
253 if (sdl->sdl_alen == 0)
254 continue;
255
256 goto found;
257 }
258 IF_ADDR_UNLOCK(ifp);
259
260 return -1;
261
262 found:
263 IF_ADDR_LOCK_ASSERT(ifp);
264 addr = LLADDR(sdl);
265 addrlen = sdl->sdl_alen;
266
267 /* get EUI64 */
268 switch (ifp->if_type) {
269 case IFT_ETHER:
270 case IFT_FDDI:
271 case IFT_ISO88025:
272 case IFT_ATM:
273 case IFT_IEEE1394:
274 #ifdef IFT_IEEE80211
275 case IFT_IEEE80211:
276 #endif
277 /* IEEE802/EUI64 cases - what others? */
278 /* IEEE1394 uses 16byte length address starting with EUI64 */
279 if (addrlen > 8)
280 addrlen = 8;
281
282 /* look at IEEE802/EUI64 only */
283 if (addrlen != 8 && addrlen != 6) {
284 IF_ADDR_UNLOCK(ifp);
285 return -1;
286 }
287
288 /*
289 * check for invalid MAC address - on bsdi, we see it a lot
290 * since wildboar configures all-zero MAC on pccard before
291 * card insertion.
292 */
293 if (bcmp(addr, allzero, addrlen) == 0) {
294 IF_ADDR_UNLOCK(ifp);
295 return -1;
296 }
297 if (bcmp(addr, allone, addrlen) == 0) {
298 IF_ADDR_UNLOCK(ifp);
299 return -1;
300 }
301
302 /* make EUI64 address */
303 if (addrlen == 8)
304 bcopy(addr, &in6->s6_addr[8], 8);
305 else if (addrlen == 6) {
306 in6->s6_addr[8] = addr[0];
307 in6->s6_addr[9] = addr[1];
308 in6->s6_addr[10] = addr[2];
309 in6->s6_addr[11] = 0xff;
310 in6->s6_addr[12] = 0xfe;
311 in6->s6_addr[13] = addr[3];
312 in6->s6_addr[14] = addr[4];
313 in6->s6_addr[15] = addr[5];
314 }
315 break;
316
317 case IFT_ARCNET:
318 if (addrlen != 1) {
319 IF_ADDR_UNLOCK(ifp);
320 return -1;
321 }
322 if (!addr[0]) {
323 IF_ADDR_UNLOCK(ifp);
324 return -1;
325 }
326
327 bzero(&in6->s6_addr[8], 8);
328 in6->s6_addr[15] = addr[0];
329
330 /*
331 * due to insufficient bitwidth, we mark it local.
332 */
333 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
334 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
335 break;
336
337 case IFT_GIF:
338 #ifdef IFT_STF
339 case IFT_STF:
340 #endif
341 /*
342 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
343 * however, IPv4 address is not very suitable as unique
344 * identifier source (can be renumbered).
345 * we don't do this.
346 */
347 IF_ADDR_UNLOCK(ifp);
348 return -1;
349
350 default:
351 IF_ADDR_UNLOCK(ifp);
352 return -1;
353 }
354
355 /* sanity check: g bit must not indicate "group" */
356 if (EUI64_GROUP(in6)) {
357 IF_ADDR_UNLOCK(ifp);
358 return -1;
359 }
360
361 /* convert EUI64 into IPv6 interface identifier */
362 EUI64_TO_IFID(in6);
363
364 /*
365 * sanity check: ifid must not be all zero, avoid conflict with
366 * subnet router anycast
367 */
368 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
369 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
370 IF_ADDR_UNLOCK(ifp);
371 return -1;
372 }
373
374 IF_ADDR_UNLOCK(ifp);
375 return 0;
376 }
377
378 /*
379 * Get interface identifier for the specified interface. If it is not
380 * available on ifp0, borrow interface identifier from other information
381 * sources.
382 *
383 * altifp - secondary EUI64 source
384 */
385 static int
386 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
387 struct in6_addr *in6)
388 {
389 struct ifnet *ifp;
390
391 /* first, try to get it from the interface itself */
392 if (in6_get_hw_ifid(ifp0, in6) == 0) {
393 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
394 if_name(ifp0)));
395 goto success;
396 }
397
398 /* try secondary EUI64 source. this basically is for ATM PVC */
399 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
400 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
401 if_name(ifp0), if_name(altifp)));
402 goto success;
403 }
404
405 /* next, try to get it from some other hardware interface */
406 IFNET_RLOCK_NOSLEEP();
407 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
408 if (ifp == ifp0)
409 continue;
410 if (in6_get_hw_ifid(ifp, in6) != 0)
411 continue;
412
413 /*
414 * to borrow ifid from other interface, ifid needs to be
415 * globally unique
416 */
417 if (IFID_UNIVERSAL(in6)) {
418 nd6log((LOG_DEBUG,
419 "%s: borrow interface identifier from %s\n",
420 if_name(ifp0), if_name(ifp)));
421 IFNET_RUNLOCK_NOSLEEP();
422 goto success;
423 }
424 }
425 IFNET_RUNLOCK_NOSLEEP();
426
427 /* last resort: get from random number source */
428 if (get_rand_ifid(ifp, in6) == 0) {
429 nd6log((LOG_DEBUG,
430 "%s: interface identifier generated by random number\n",
431 if_name(ifp0)));
432 goto success;
433 }
434
435 printf("%s: failed to get interface identifier\n", if_name(ifp0));
436 return -1;
437
438 success:
439 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
440 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
441 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
442 in6->s6_addr[14], in6->s6_addr[15]));
443 return 0;
444 }
445
446 /*
447 * altifp - secondary EUI64 source
448 */
449 static int
450 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
451 {
452 struct in6_ifaddr *ia;
453 struct in6_aliasreq ifra;
454 struct nd_prefixctl pr0;
455 int i, error;
456
457 /*
458 * configure link-local address.
459 */
460 bzero(&ifra, sizeof(ifra));
461
462 /*
463 * in6_update_ifa() does not use ifra_name, but we accurately set it
464 * for safety.
465 */
466 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
467
468 ifra.ifra_addr.sin6_family = AF_INET6;
469 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
470 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
471 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
472 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
473 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
474 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
475 } else {
476 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
477 nd6log((LOG_ERR,
478 "%s: no ifid available\n", if_name(ifp)));
479 return (-1);
480 }
481 }
482 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
483 return (-1);
484
485 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
486 ifra.ifra_prefixmask.sin6_family = AF_INET6;
487 ifra.ifra_prefixmask.sin6_addr = in6mask64;
488 /* link-local addresses should NEVER expire. */
489 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
490 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
491
492 /*
493 * Now call in6_update_ifa() to do a bunch of procedures to configure
494 * a link-local address. We can set the 3rd argument to NULL, because
495 * we know there's no other link-local address on the interface
496 * and therefore we are adding one (instead of updating one).
497 */
498 if ((error = in6_update_ifa(ifp, &ifra, NULL,
499 IN6_IFAUPDATE_DADDELAY)) != 0) {
500 /*
501 * XXX: When the interface does not support IPv6, this call
502 * would fail in the SIOCSIFADDR ioctl. I believe the
503 * notification is rather confusing in this case, so just
504 * suppress it. (jinmei@kame.net 20010130)
505 */
506 if (error != EAFNOSUPPORT)
507 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
508 "configure a link-local address on %s "
509 "(errno=%d)\n",
510 if_name(ifp), error));
511 return (-1);
512 }
513
514 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
515 #ifdef DIAGNOSTIC
516 if (!ia) {
517 panic("ia == NULL in in6_ifattach_linklocal");
518 /* NOTREACHED */
519 }
520 #endif
521 ifa_free(&ia->ia_ifa);
522
523 /*
524 * Make the link-local prefix (fe80::%link/64) as on-link.
525 * Since we'd like to manage prefixes separately from addresses,
526 * we make an ND6 prefix structure for the link-local prefix,
527 * and add it to the prefix list as a never-expire prefix.
528 * XXX: this change might affect some existing code base...
529 */
530 bzero(&pr0, sizeof(pr0));
531 pr0.ndpr_ifp = ifp;
532 /* this should be 64 at this moment. */
533 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
534 pr0.ndpr_prefix = ifra.ifra_addr;
535 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
536 for (i = 0; i < 4; i++) {
537 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
538 in6mask64.s6_addr32[i];
539 }
540 /*
541 * Initialize parameters. The link-local prefix must always be
542 * on-link, and its lifetimes never expire.
543 */
544 pr0.ndpr_raf_onlink = 1;
545 pr0.ndpr_raf_auto = 1; /* probably meaningless */
546 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
547 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
548 /*
549 * Since there is no other link-local addresses, nd6_prefix_lookup()
550 * probably returns NULL. However, we cannot always expect the result.
551 * For example, if we first remove the (only) existing link-local
552 * address, and then reconfigure another one, the prefix is still
553 * valid with referring to the old link-local address.
554 */
555 if (nd6_prefix_lookup(&pr0) == NULL) {
556 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
557 return (error);
558 }
559
560 return 0;
561 }
562
563 /*
564 * ifp - must be IFT_LOOP
565 */
566 static int
567 in6_ifattach_loopback(struct ifnet *ifp)
568 {
569 struct in6_aliasreq ifra;
570 int error;
571
572 bzero(&ifra, sizeof(ifra));
573
574 /*
575 * in6_update_ifa() does not use ifra_name, but we accurately set it
576 * for safety.
577 */
578 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
579
580 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
581 ifra.ifra_prefixmask.sin6_family = AF_INET6;
582 ifra.ifra_prefixmask.sin6_addr = in6mask128;
583
584 /*
585 * Always initialize ia_dstaddr (= broadcast address) to loopback
586 * address. Follows IPv4 practice - see in_ifinit().
587 */
588 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
589 ifra.ifra_dstaddr.sin6_family = AF_INET6;
590 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
591
592 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
593 ifra.ifra_addr.sin6_family = AF_INET6;
594 ifra.ifra_addr.sin6_addr = in6addr_loopback;
595
596 /* the loopback address should NEVER expire. */
597 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
598 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
599
600 /* we don't need to perform DAD on loopback interfaces. */
601 ifra.ifra_flags |= IN6_IFF_NODAD;
602
603 /* skip registration to the prefix list. XXX should be temporary. */
604 ifra.ifra_flags |= IN6_IFF_NOPFX;
605
606 /*
607 * We are sure that this is a newly assigned address, so we can set
608 * NULL to the 3rd arg.
609 */
610 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
611 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
612 "the loopback address on %s (errno=%d)\n",
613 if_name(ifp), error));
614 return (-1);
615 }
616
617 return 0;
618 }
619
620 /*
621 * compute NI group address, based on the current hostname setting.
622 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
623 *
624 * when ifp == NULL, the caller is responsible for filling scopeid.
625 */
626 int
627 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
628 struct in6_addr *in6)
629 {
630 struct prison *pr;
631 const char *p;
632 u_char *q;
633 MD5_CTX ctxt;
634 u_int8_t digest[16];
635 char l;
636 char n[64]; /* a single label must not exceed 63 chars */
637
638 /*
639 * If no name is given and namelen is -1,
640 * we try to do the hostname lookup ourselves.
641 */
642 if (!name && namelen == -1) {
643 pr = curthread->td_ucred->cr_prison;
644 mtx_lock(&pr->pr_mtx);
645 name = pr->pr_hostname;
646 namelen = strlen(name);
647 } else
648 pr = NULL;
649 if (!name || !namelen) {
650 if (pr != NULL)
651 mtx_unlock(&pr->pr_mtx);
652 return -1;
653 }
654
655 p = name;
656 while (p && *p && *p != '.' && p - name < namelen)
657 p++;
658 if (p == name || p - name > sizeof(n) - 1) {
659 if (pr != NULL)
660 mtx_unlock(&pr->pr_mtx);
661 return -1; /* label too long */
662 }
663 l = p - name;
664 strncpy(n, name, l);
665 if (pr != NULL)
666 mtx_unlock(&pr->pr_mtx);
667 n[(int)l] = '\0';
668 for (q = n; *q; q++) {
669 if ('A' <= *q && *q <= 'Z')
670 *q = *q - 'A' + 'a';
671 }
672
673 /* generate 8 bytes of pseudo-random value. */
674 bzero(&ctxt, sizeof(ctxt));
675 MD5Init(&ctxt);
676 MD5Update(&ctxt, &l, sizeof(l));
677 MD5Update(&ctxt, n, l);
678 MD5Final(digest, &ctxt);
679
680 bzero(in6, sizeof(*in6));
681 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
682 in6->s6_addr8[11] = 2;
683 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
684 if (in6_setscope(in6, ifp, NULL))
685 return (-1); /* XXX: should not fail */
686
687 return 0;
688 }
689
690 /*
691 * XXX multiple loopback interface needs more care. for instance,
692 * nodelocal address needs to be configured onto only one of them.
693 * XXX multiple link-local address case
694 *
695 * altifp - secondary EUI64 source
696 */
697 void
698 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
699 {
700 struct in6_ifaddr *ia;
701 struct in6_addr in6;
702
703 /* some of the interfaces are inherently not IPv6 capable */
704 switch (ifp->if_type) {
705 case IFT_PFLOG:
706 case IFT_PFSYNC:
707 case IFT_CARP:
708 return;
709 }
710
711 /*
712 * quirks based on interface type
713 */
714 switch (ifp->if_type) {
715 #ifdef IFT_STF
716 case IFT_STF:
717 /*
718 * 6to4 interface is a very special kind of beast.
719 * no multicast, no linklocal. RFC2529 specifies how to make
720 * linklocals for 6to4 interface, but there's no use and
721 * it is rather harmful to have one.
722 */
723 goto statinit;
724 #endif
725 default:
726 break;
727 }
728
729 /*
730 * usually, we require multicast capability to the interface
731 */
732 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
733 nd6log((LOG_INFO, "in6_ifattach: "
734 "%s is not multicast capable, IPv6 not enabled\n",
735 if_name(ifp)));
736 return;
737 }
738
739 /*
740 * assign loopback address for loopback interface.
741 * XXX multiple loopback interface case.
742 */
743 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
744 struct ifaddr *ifa;
745
746 in6 = in6addr_loopback;
747 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
748 if (ifa == NULL) {
749 if (in6_ifattach_loopback(ifp) != 0)
750 return;
751 } else
752 ifa_free(ifa);
753 }
754
755 /*
756 * assign a link-local address, if there's none.
757 */
758 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) {
759 ia = in6ifa_ifpforlinklocal(ifp, 0);
760 if (ia == NULL) {
761 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
762 /* linklocal address assigned */
763 } else {
764 /* failed to assign linklocal address. bark? */
765 }
766 } else
767 ifa_free(&ia->ia_ifa);
768 }
769
770 #ifdef IFT_STF /* XXX */
771 statinit:
772 #endif
773
774 /* update dynamically. */
775 if (V_in6_maxmtu < ifp->if_mtu)
776 V_in6_maxmtu = ifp->if_mtu;
777 }
778
779 /*
780 * NOTE: in6_ifdetach() does not support loopback if at this moment.
781 * We don't need this function in bsdi, because interfaces are never removed
782 * from the ifnet list in bsdi.
783 */
784 void
785 in6_ifdetach(struct ifnet *ifp)
786 {
787 struct in6_ifaddr *ia;
788 struct ifaddr *ifa, *next;
789 struct radix_node_head *rnh;
790 struct rtentry *rt;
791 short rtflags;
792 struct sockaddr_in6 sin6;
793 struct in6_multi_mship *imm;
794
795 /* remove neighbor management table */
796 nd6_purge(ifp);
797
798 /* nuke any of IPv6 addresses we have */
799 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
800 if (ifa->ifa_addr->sa_family != AF_INET6)
801 continue;
802 in6_purgeaddr(ifa);
803 }
804
805 /* undo everything done by in6_ifattach(), just in case */
806 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
807 if (ifa->ifa_addr->sa_family != AF_INET6
808 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
809 continue;
810 }
811
812 ia = (struct in6_ifaddr *)ifa;
813
814 /*
815 * leave from multicast groups we have joined for the interface
816 */
817 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
818 LIST_REMOVE(imm, i6mm_chain);
819 in6_leavegroup(imm);
820 }
821
822 /* remove from the routing table */
823 if ((ia->ia_flags & IFA_ROUTE) &&
824 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
825 rtflags = rt->rt_flags;
826 RTFREE_LOCKED(rt);
827 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr,
828 (struct sockaddr *)&ia->ia_addr,
829 (struct sockaddr *)&ia->ia_prefixmask,
830 rtflags, (struct rtentry **)0);
831 }
832
833 /* remove from the linked list */
834 IF_ADDR_LOCK(ifp);
835 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
836 IF_ADDR_UNLOCK(ifp);
837 ifa_free(ifa); /* if_addrhead */
838
839 IN6_IFADDR_WLOCK();
840 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
841 IN6_IFADDR_WUNLOCK();
842 ifa_free(ifa);
843 }
844
845 in6_pcbpurgeif0(&V_udbinfo, ifp);
846 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
847 /* leave from all multicast groups joined */
848 in6_purgemaddrs(ifp);
849
850 /*
851 * remove neighbor management table. we call it twice just to make
852 * sure we nuke everything. maybe we need just one call.
853 * XXX: since the first call did not release addresses, some prefixes
854 * might remain. We should call nd6_purge() again to release the
855 * prefixes after removing all addresses above.
856 * (Or can we just delay calling nd6_purge until at this point?)
857 */
858 nd6_purge(ifp);
859
860 /* remove route to link-local allnodes multicast (ff02::1) */
861 bzero(&sin6, sizeof(sin6));
862 sin6.sin6_len = sizeof(struct sockaddr_in6);
863 sin6.sin6_family = AF_INET6;
864 sin6.sin6_addr = in6addr_linklocal_allnodes;
865 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
866 /* XXX: should not fail */
867 return;
868 /* XXX grab lock first to avoid LOR */
869 rnh = rt_tables_get_rnh(0, AF_INET6);
870 if (rnh != NULL) {
871 RADIX_NODE_HEAD_LOCK(rnh);
872 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED);
873 if (rt) {
874 if (rt->rt_ifp == ifp)
875 rtexpunge(rt);
876 RTFREE_LOCKED(rt);
877 }
878 RADIX_NODE_HEAD_UNLOCK(rnh);
879 }
880 }
881
882 int
883 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
884 const u_int8_t *baseid, int generate)
885 {
886 u_int8_t nullbuf[8];
887 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
888
889 bzero(nullbuf, sizeof(nullbuf));
890 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
891 /* we've never created a random ID. Create a new one. */
892 generate = 1;
893 }
894
895 if (generate) {
896 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
897
898 /* generate_tmp_ifid will update seedn and buf */
899 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
900 ndi->randomid);
901 }
902 bcopy(ndi->randomid, retbuf, 8);
903
904 return (0);
905 }
906
907 void
908 in6_tmpaddrtimer(void *arg)
909 {
910 CURVNET_SET((struct vnet *) arg);
911 struct nd_ifinfo *ndi;
912 u_int8_t nullbuf[8];
913 struct ifnet *ifp;
914
915 callout_reset(&V_in6_tmpaddrtimer_ch,
916 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
917 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
918
919 bzero(nullbuf, sizeof(nullbuf));
920 for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
921 ifp = TAILQ_NEXT(ifp, if_list)) {
922 ndi = ND_IFINFO(ifp);
923 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
924 /*
925 * We've been generating a random ID on this interface.
926 * Create a new one.
927 */
928 (void)generate_tmp_ifid(ndi->randomseed0,
929 ndi->randomseed1, ndi->randomid);
930 }
931 }
932
933 CURVNET_RESTORE();
934 }
935
936 static void
937 in6_purgemaddrs(struct ifnet *ifp)
938 {
939 LIST_HEAD(,in6_multi) purgeinms;
940 struct in6_multi *inm, *tinm;
941 struct ifmultiaddr *ifma;
942
943 LIST_INIT(&purgeinms);
944 IN6_MULTI_LOCK();
945
946 /*
947 * Extract list of in6_multi associated with the detaching ifp
948 * which the PF_INET6 layer is about to release.
949 * We need to do this as IF_ADDR_LOCK() may be re-acquired
950 * by code further down.
951 */
952 IF_ADDR_LOCK(ifp);
953 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
954 if (ifma->ifma_addr->sa_family != AF_INET6 ||
955 ifma->ifma_protospec == NULL)
956 continue;
957 inm = (struct in6_multi *)ifma->ifma_protospec;
958 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
959 }
960 IF_ADDR_UNLOCK(ifp);
961
962 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
963 LIST_REMOVE(inm, in6m_entry);
964 in6m_release_locked(inm);
965 }
966 mld_ifdetach(ifp);
967
968 IN6_MULTI_UNLOCK();
969 }
Cache object: 7137c85df1dc4b55da5f7ef1b480fba9
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