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/10.3/sys/netinet6/in6_ifattach.c 287734 2015-09-13 02:09:06Z hrs $");
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_RLOCK(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_RUNLOCK(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_BRIDGE:
270 case IFT_ETHER:
271 case IFT_L2VLAN:
272 case IFT_FDDI:
273 case IFT_ISO88025:
274 case IFT_ATM:
275 case IFT_IEEE1394:
276 #ifdef IFT_IEEE80211
277 case IFT_IEEE80211:
278 #endif
279 /* IEEE802/EUI64 cases - what others? */
280 /* IEEE1394 uses 16byte length address starting with EUI64 */
281 if (addrlen > 8)
282 addrlen = 8;
283
284 /* look at IEEE802/EUI64 only */
285 if (addrlen != 8 && addrlen != 6) {
286 IF_ADDR_RUNLOCK(ifp);
287 return -1;
288 }
289
290 /*
291 * check for invalid MAC address - on bsdi, we see it a lot
292 * since wildboar configures all-zero MAC on pccard before
293 * card insertion.
294 */
295 if (bcmp(addr, allzero, addrlen) == 0) {
296 IF_ADDR_RUNLOCK(ifp);
297 return -1;
298 }
299 if (bcmp(addr, allone, addrlen) == 0) {
300 IF_ADDR_RUNLOCK(ifp);
301 return -1;
302 }
303
304 /* make EUI64 address */
305 if (addrlen == 8)
306 bcopy(addr, &in6->s6_addr[8], 8);
307 else if (addrlen == 6) {
308 in6->s6_addr[8] = addr[0];
309 in6->s6_addr[9] = addr[1];
310 in6->s6_addr[10] = addr[2];
311 in6->s6_addr[11] = 0xff;
312 in6->s6_addr[12] = 0xfe;
313 in6->s6_addr[13] = addr[3];
314 in6->s6_addr[14] = addr[4];
315 in6->s6_addr[15] = addr[5];
316 }
317 break;
318
319 case IFT_ARCNET:
320 if (addrlen != 1) {
321 IF_ADDR_RUNLOCK(ifp);
322 return -1;
323 }
324 if (!addr[0]) {
325 IF_ADDR_RUNLOCK(ifp);
326 return -1;
327 }
328
329 bzero(&in6->s6_addr[8], 8);
330 in6->s6_addr[15] = addr[0];
331
332 /*
333 * due to insufficient bitwidth, we mark it local.
334 */
335 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
336 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
337 break;
338
339 case IFT_GIF:
340 #ifdef IFT_STF
341 case IFT_STF:
342 #endif
343 /*
344 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
345 * however, IPv4 address is not very suitable as unique
346 * identifier source (can be renumbered).
347 * we don't do this.
348 */
349 IF_ADDR_RUNLOCK(ifp);
350 return -1;
351
352 default:
353 IF_ADDR_RUNLOCK(ifp);
354 return -1;
355 }
356
357 /* sanity check: g bit must not indicate "group" */
358 if (EUI64_GROUP(in6)) {
359 IF_ADDR_RUNLOCK(ifp);
360 return -1;
361 }
362
363 /* convert EUI64 into IPv6 interface identifier */
364 EUI64_TO_IFID(in6);
365
366 /*
367 * sanity check: ifid must not be all zero, avoid conflict with
368 * subnet router anycast
369 */
370 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
371 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
372 IF_ADDR_RUNLOCK(ifp);
373 return -1;
374 }
375
376 IF_ADDR_RUNLOCK(ifp);
377 return 0;
378 }
379
380 /*
381 * Get interface identifier for the specified interface. If it is not
382 * available on ifp0, borrow interface identifier from other information
383 * sources.
384 *
385 * altifp - secondary EUI64 source
386 */
387 static int
388 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
389 struct in6_addr *in6)
390 {
391 struct ifnet *ifp;
392
393 /* first, try to get it from the interface itself */
394 if (in6_get_hw_ifid(ifp0, in6) == 0) {
395 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
396 if_name(ifp0)));
397 goto success;
398 }
399
400 /* try secondary EUI64 source. this basically is for ATM PVC */
401 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
402 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
403 if_name(ifp0), if_name(altifp)));
404 goto success;
405 }
406
407 /* next, try to get it from some other hardware interface */
408 IFNET_RLOCK_NOSLEEP();
409 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
410 if (ifp == ifp0)
411 continue;
412 if (in6_get_hw_ifid(ifp, in6) != 0)
413 continue;
414
415 /*
416 * to borrow ifid from other interface, ifid needs to be
417 * globally unique
418 */
419 if (IFID_UNIVERSAL(in6)) {
420 nd6log((LOG_DEBUG,
421 "%s: borrow interface identifier from %s\n",
422 if_name(ifp0), if_name(ifp)));
423 IFNET_RUNLOCK_NOSLEEP();
424 goto success;
425 }
426 }
427 IFNET_RUNLOCK_NOSLEEP();
428
429 /* last resort: get from random number source */
430 if (get_rand_ifid(ifp, in6) == 0) {
431 nd6log((LOG_DEBUG,
432 "%s: interface identifier generated by random number\n",
433 if_name(ifp0)));
434 goto success;
435 }
436
437 printf("%s: failed to get interface identifier\n", if_name(ifp0));
438 return -1;
439
440 success:
441 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
442 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
443 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
444 in6->s6_addr[14], in6->s6_addr[15]));
445 return 0;
446 }
447
448 /*
449 * altifp - secondary EUI64 source
450 */
451 static int
452 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
453 {
454 struct in6_ifaddr *ia;
455 struct in6_aliasreq ifra;
456 struct nd_prefixctl pr0;
457 int i, error;
458
459 /*
460 * configure link-local address.
461 */
462 bzero(&ifra, sizeof(ifra));
463
464 /*
465 * in6_update_ifa() does not use ifra_name, but we accurately set it
466 * for safety.
467 */
468 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
469
470 ifra.ifra_addr.sin6_family = AF_INET6;
471 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
472 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
473 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
474 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
475 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
476 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
477 } else {
478 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
479 nd6log((LOG_ERR,
480 "%s: no ifid available\n", if_name(ifp)));
481 return (-1);
482 }
483 }
484 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
485 return (-1);
486
487 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
488 ifra.ifra_prefixmask.sin6_family = AF_INET6;
489 ifra.ifra_prefixmask.sin6_addr = in6mask64;
490 /* link-local addresses should NEVER expire. */
491 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
492 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
493
494 /*
495 * Now call in6_update_ifa() to do a bunch of procedures to configure
496 * a link-local address. We can set the 3rd argument to NULL, because
497 * we know there's no other link-local address on the interface
498 * and therefore we are adding one (instead of updating one).
499 */
500 if ((error = in6_update_ifa(ifp, &ifra, NULL,
501 IN6_IFAUPDATE_DADDELAY)) != 0) {
502 /*
503 * XXX: When the interface does not support IPv6, this call
504 * would fail in the SIOCSIFADDR ioctl. I believe the
505 * notification is rather confusing in this case, so just
506 * suppress it. (jinmei@kame.net 20010130)
507 */
508 if (error != EAFNOSUPPORT)
509 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
510 "configure a link-local address on %s "
511 "(errno=%d)\n",
512 if_name(ifp), error));
513 return (-1);
514 }
515
516 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
517 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
518
519 ifa_free(&ia->ia_ifa);
520
521 /*
522 * Make the link-local prefix (fe80::%link/64) as on-link.
523 * Since we'd like to manage prefixes separately from addresses,
524 * we make an ND6 prefix structure for the link-local prefix,
525 * and add it to the prefix list as a never-expire prefix.
526 * XXX: this change might affect some existing code base...
527 */
528 bzero(&pr0, sizeof(pr0));
529 pr0.ndpr_ifp = ifp;
530 /* this should be 64 at this moment. */
531 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
532 pr0.ndpr_prefix = ifra.ifra_addr;
533 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
534 for (i = 0; i < 4; i++) {
535 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
536 in6mask64.s6_addr32[i];
537 }
538 /*
539 * Initialize parameters. The link-local prefix must always be
540 * on-link, and its lifetimes never expire.
541 */
542 pr0.ndpr_raf_onlink = 1;
543 pr0.ndpr_raf_auto = 1; /* probably meaningless */
544 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
545 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
546 /*
547 * Since there is no other link-local addresses, nd6_prefix_lookup()
548 * probably returns NULL. However, we cannot always expect the result.
549 * For example, if we first remove the (only) existing link-local
550 * address, and then reconfigure another one, the prefix is still
551 * valid with referring to the old link-local address.
552 */
553 if (nd6_prefix_lookup(&pr0) == NULL) {
554 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
555 return (error);
556 }
557
558 return 0;
559 }
560
561 /*
562 * ifp - must be IFT_LOOP
563 */
564 static int
565 in6_ifattach_loopback(struct ifnet *ifp)
566 {
567 struct in6_aliasreq ifra;
568 int error;
569
570 bzero(&ifra, sizeof(ifra));
571
572 /*
573 * in6_update_ifa() does not use ifra_name, but we accurately set it
574 * for safety.
575 */
576 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
577
578 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
579 ifra.ifra_prefixmask.sin6_family = AF_INET6;
580 ifra.ifra_prefixmask.sin6_addr = in6mask128;
581
582 /*
583 * Always initialize ia_dstaddr (= broadcast address) to loopback
584 * address. Follows IPv4 practice - see in_ifinit().
585 */
586 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
587 ifra.ifra_dstaddr.sin6_family = AF_INET6;
588 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
589
590 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
591 ifra.ifra_addr.sin6_family = AF_INET6;
592 ifra.ifra_addr.sin6_addr = in6addr_loopback;
593
594 /* the loopback address should NEVER expire. */
595 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
596 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
597
598 /*
599 * We are sure that this is a newly assigned address, so we can set
600 * NULL to the 3rd arg.
601 */
602 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
603 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
604 "the loopback address on %s (errno=%d)\n",
605 if_name(ifp), error));
606 return (-1);
607 }
608
609 return 0;
610 }
611
612 /*
613 * compute NI group address, based on the current hostname setting.
614 * see RFC 4620.
615 *
616 * when ifp == NULL, the caller is responsible for filling scopeid.
617 *
618 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
619 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
620 */
621 static int
622 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
623 struct in6_addr *in6, int oldmcprefix)
624 {
625 struct prison *pr;
626 const char *p;
627 u_char *q;
628 MD5_CTX ctxt;
629 u_int8_t digest[16];
630 char l;
631 char n[64]; /* a single label must not exceed 63 chars */
632
633 /*
634 * If no name is given and namelen is -1,
635 * we try to do the hostname lookup ourselves.
636 */
637 if (!name && namelen == -1) {
638 pr = curthread->td_ucred->cr_prison;
639 mtx_lock(&pr->pr_mtx);
640 name = pr->pr_hostname;
641 namelen = strlen(name);
642 } else
643 pr = NULL;
644 if (!name || !namelen) {
645 if (pr != NULL)
646 mtx_unlock(&pr->pr_mtx);
647 return -1;
648 }
649
650 p = name;
651 while (p && *p && *p != '.' && p - name < namelen)
652 p++;
653 if (p == name || p - name > sizeof(n) - 1) {
654 if (pr != NULL)
655 mtx_unlock(&pr->pr_mtx);
656 return -1; /* label too long */
657 }
658 l = p - name;
659 strncpy(n, name, l);
660 if (pr != NULL)
661 mtx_unlock(&pr->pr_mtx);
662 n[(int)l] = '\0';
663 for (q = n; *q; q++) {
664 if ('A' <= *q && *q <= 'Z')
665 *q = *q - 'A' + 'a';
666 }
667
668 /* generate 16 bytes of pseudo-random value. */
669 bzero(&ctxt, sizeof(ctxt));
670 MD5Init(&ctxt);
671 MD5Update(&ctxt, &l, sizeof(l));
672 MD5Update(&ctxt, n, l);
673 MD5Final(digest, &ctxt);
674
675 bzero(in6, sizeof(*in6));
676 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
677 in6->s6_addr8[11] = 2;
678 if (oldmcprefix == 0) {
679 in6->s6_addr8[12] = 0xff;
680 /* Copy the first 24 bits of 128-bit hash into the address. */
681 bcopy(digest, &in6->s6_addr8[13], 3);
682 } else {
683 /* Copy the first 32 bits of 128-bit hash into the address. */
684 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
685 }
686 if (in6_setscope(in6, ifp, NULL))
687 return (-1); /* XXX: should not fail */
688
689 return 0;
690 }
691
692 int
693 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
694 struct in6_addr *in6)
695 {
696
697 return (in6_nigroup0(ifp, name, namelen, in6, 0));
698 }
699
700 int
701 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
702 struct in6_addr *in6)
703 {
704
705 return (in6_nigroup0(ifp, name, namelen, in6, 1));
706 }
707
708 /*
709 * XXX multiple loopback interface needs more care. for instance,
710 * nodelocal address needs to be configured onto only one of them.
711 * XXX multiple link-local address case
712 *
713 * altifp - secondary EUI64 source
714 */
715 void
716 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
717 {
718 struct in6_ifaddr *ia;
719 struct in6_addr in6;
720
721 if (ifp->if_afdata[AF_INET6] == NULL)
722 return;
723 /*
724 * quirks based on interface type
725 */
726 switch (ifp->if_type) {
727 case IFT_STF:
728 /*
729 * 6to4 interface is a very special kind of beast.
730 * no multicast, no linklocal. RFC2529 specifies how to make
731 * linklocals for 6to4 interface, but there's no use and
732 * it is rather harmful to have one.
733 */
734 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
735 break;
736 default:
737 break;
738 }
739
740 /*
741 * usually, we require multicast capability to the interface
742 */
743 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
744 nd6log((LOG_INFO, "in6_ifattach: "
745 "%s is not multicast capable, IPv6 not enabled\n",
746 if_name(ifp)));
747 return;
748 }
749
750 /*
751 * assign loopback address for loopback interface.
752 * XXX multiple loopback interface case.
753 */
754 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
755 struct ifaddr *ifa;
756
757 in6 = in6addr_loopback;
758 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
759 if (ifa == NULL) {
760 if (in6_ifattach_loopback(ifp) != 0)
761 return;
762 } else
763 ifa_free(ifa);
764 }
765
766 /*
767 * assign a link-local address, if there's none.
768 */
769 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
770 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
771 int error;
772
773 ia = in6ifa_ifpforlinklocal(ifp, 0);
774 if (ia == NULL) {
775 error = in6_ifattach_linklocal(ifp, altifp);
776 #if 0
777 if (error)
778 log(LOG_NOTICE, "in6_ifattach_linklocal: "
779 "failed to add a link-local addr to %s\n",
780 if_name(ifp));
781 #endif
782 } else
783 ifa_free(&ia->ia_ifa);
784 }
785
786 /* update dynamically. */
787 if (V_in6_maxmtu < ifp->if_mtu)
788 V_in6_maxmtu = ifp->if_mtu;
789 }
790
791 /*
792 * NOTE: in6_ifdetach() does not support loopback if at this moment.
793 * We don't need this function in bsdi, because interfaces are never removed
794 * from the ifnet list in bsdi.
795 */
796 void
797 in6_ifdetach(struct ifnet *ifp)
798 {
799 struct in6_ifaddr *ia;
800 struct ifaddr *ifa, *next;
801 struct radix_node_head *rnh;
802 struct rtentry *rt;
803 struct sockaddr_in6 sin6;
804 struct in6_multi_mship *imm;
805
806 if (ifp->if_afdata[AF_INET6] == NULL)
807 return;
808
809 /* remove neighbor management table */
810 nd6_purge(ifp);
811
812 /* nuke any of IPv6 addresses we have */
813 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
814 if (ifa->ifa_addr->sa_family != AF_INET6)
815 continue;
816 in6_purgeaddr(ifa);
817 }
818
819 /* undo everything done by in6_ifattach(), just in case */
820 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
821 if (ifa->ifa_addr->sa_family != AF_INET6
822 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
823 continue;
824 }
825
826 ia = (struct in6_ifaddr *)ifa;
827
828 /*
829 * leave from multicast groups we have joined for the interface
830 */
831 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
832 LIST_REMOVE(imm, i6mm_chain);
833 in6_leavegroup(imm);
834 }
835
836 /* Remove link-local from the routing table. */
837 if (ia->ia_flags & IFA_ROUTE)
838 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags);
839
840 /* remove from the linked list */
841 IF_ADDR_WLOCK(ifp);
842 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
843 IF_ADDR_WUNLOCK(ifp);
844 ifa_free(ifa); /* if_addrhead */
845
846 IN6_IFADDR_WLOCK();
847 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
848 IN6_IFADDR_WUNLOCK();
849 ifa_free(ifa);
850 }
851
852 in6_pcbpurgeif0(&V_udbinfo, ifp);
853 in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
854 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
855 /* leave from all multicast groups joined */
856 in6_purgemaddrs(ifp);
857
858 /*
859 * remove neighbor management table. we call it twice just to make
860 * sure we nuke everything. maybe we need just one call.
861 * XXX: since the first call did not release addresses, some prefixes
862 * might remain. We should call nd6_purge() again to release the
863 * prefixes after removing all addresses above.
864 * (Or can we just delay calling nd6_purge until at this point?)
865 */
866 nd6_purge(ifp);
867
868 /*
869 * Remove route to link-local allnodes multicast (ff02::1).
870 * These only get automatically installed for the default FIB.
871 */
872 bzero(&sin6, sizeof(sin6));
873 sin6.sin6_len = sizeof(struct sockaddr_in6);
874 sin6.sin6_family = AF_INET6;
875 sin6.sin6_addr = in6addr_linklocal_allnodes;
876 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
877 /* XXX: should not fail */
878 return;
879 /* XXX grab lock first to avoid LOR */
880 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6);
881 if (rnh != NULL) {
882 RADIX_NODE_HEAD_LOCK(rnh);
883 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED,
884 RT_DEFAULT_FIB);
885 if (rt) {
886 if (rt->rt_ifp == ifp)
887 rtexpunge(rt);
888 RTFREE_LOCKED(rt);
889 }
890 RADIX_NODE_HEAD_UNLOCK(rnh);
891 }
892 }
893
894 int
895 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
896 const u_int8_t *baseid, int generate)
897 {
898 u_int8_t nullbuf[8];
899 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
900
901 bzero(nullbuf, sizeof(nullbuf));
902 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
903 /* we've never created a random ID. Create a new one. */
904 generate = 1;
905 }
906
907 if (generate) {
908 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
909
910 /* generate_tmp_ifid will update seedn and buf */
911 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
912 ndi->randomid);
913 }
914 bcopy(ndi->randomid, retbuf, 8);
915
916 return (0);
917 }
918
919 void
920 in6_tmpaddrtimer(void *arg)
921 {
922 CURVNET_SET((struct vnet *) arg);
923 struct nd_ifinfo *ndi;
924 u_int8_t nullbuf[8];
925 struct ifnet *ifp;
926
927 callout_reset(&V_in6_tmpaddrtimer_ch,
928 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
929 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
930
931 bzero(nullbuf, sizeof(nullbuf));
932 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
933 if (ifp->if_afdata[AF_INET6] == NULL)
934 continue;
935 ndi = ND_IFINFO(ifp);
936 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
937 /*
938 * We've been generating a random ID on this interface.
939 * Create a new one.
940 */
941 (void)generate_tmp_ifid(ndi->randomseed0,
942 ndi->randomseed1, ndi->randomid);
943 }
944 }
945
946 CURVNET_RESTORE();
947 }
948
949 static void
950 in6_purgemaddrs(struct ifnet *ifp)
951 {
952 LIST_HEAD(,in6_multi) purgeinms;
953 struct in6_multi *inm, *tinm;
954 struct ifmultiaddr *ifma;
955
956 LIST_INIT(&purgeinms);
957 IN6_MULTI_LOCK();
958
959 /*
960 * Extract list of in6_multi associated with the detaching ifp
961 * which the PF_INET6 layer is about to release.
962 * We need to do this as IF_ADDR_LOCK() may be re-acquired
963 * by code further down.
964 */
965 IF_ADDR_RLOCK(ifp);
966 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
967 if (ifma->ifma_addr->sa_family != AF_INET6 ||
968 ifma->ifma_protospec == NULL)
969 continue;
970 inm = (struct in6_multi *)ifma->ifma_protospec;
971 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
972 }
973 IF_ADDR_RUNLOCK(ifp);
974
975 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
976 LIST_REMOVE(inm, in6m_entry);
977 in6m_release_locked(inm);
978 }
979 mld_ifdetach(ifp);
980
981 IN6_MULTI_UNLOCK();
982 }
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