1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/jail.h>
43 #include <sys/kernel.h>
44 #include <sys/lock.h>
45 #include <sys/proc.h>
46 #include <sys/rmlock.h>
47 #include <sys/syslog.h>
48 #include <sys/md5.h>
49
50 #include <net/if.h>
51 #include <net/if_var.h>
52 #include <net/if_dl.h>
53 #include <net/if_types.h>
54 #include <net/route.h>
55 #include <net/vnet.h>
56
57 #include <netinet/in.h>
58 #include <netinet/in_var.h>
59 #include <netinet/if_ether.h>
60 #include <netinet/in_pcb.h>
61 #include <netinet/ip_var.h>
62 #include <netinet/udp.h>
63 #include <netinet/udp_var.h>
64
65 #include <netinet/ip6.h>
66 #include <netinet6/ip6_var.h>
67 #include <netinet6/in6_var.h>
68 #include <netinet6/in6_pcb.h>
69 #include <netinet6/in6_ifattach.h>
70 #include <netinet6/ip6_var.h>
71 #include <netinet6/nd6.h>
72 #include <netinet6/mld6_var.h>
73 #include <netinet6/scope6_var.h>
74
75 VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
76
77 #ifdef IP6_AUTO_LINKLOCAL
78 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
79 #else
80 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
81 #endif
82
83 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
84 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
85
86 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
87 #define V_ripcbinfo VNET(ripcbinfo)
88
89 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
90 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
91 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
92 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
93 static int in6_ifattach_loopback(struct ifnet *);
94 static void in6_purgemaddrs(struct ifnet *);
95
96 #define EUI64_GBIT 0x01
97 #define EUI64_UBIT 0x02
98 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
99 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
100 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
101 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
102 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
103
104 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
105 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
106
107 /*
108 * Generate a last-resort interface identifier, when the machine has no
109 * IEEE802/EUI64 address sources.
110 * The goal here is to get an interface identifier that is
111 * (1) random enough and (2) does not change across reboot.
112 * We currently use MD5(hostname) for it.
113 *
114 * in6 - upper 64bits are preserved
115 */
116 static int
117 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
118 {
119 MD5_CTX ctxt;
120 struct prison *pr;
121 u_int8_t digest[16];
122 int hostnamelen;
123
124 pr = curthread->td_ucred->cr_prison;
125 mtx_lock(&pr->pr_mtx);
126 hostnamelen = strlen(pr->pr_hostname);
127 #if 0
128 /* we need at least several letters as seed for ifid */
129 if (hostnamelen < 3) {
130 mtx_unlock(&pr->pr_mtx);
131 return -1;
132 }
133 #endif
134
135 /* generate 8 bytes of pseudo-random value. */
136 bzero(&ctxt, sizeof(ctxt));
137 MD5Init(&ctxt);
138 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
139 mtx_unlock(&pr->pr_mtx);
140 MD5Final(digest, &ctxt);
141
142 /* assumes sizeof(digest) > sizeof(ifid) */
143 bcopy(digest, &in6->s6_addr[8], 8);
144
145 /* make sure to set "u" bit to local, and "g" bit to individual. */
146 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
147 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
148
149 /* convert EUI64 into IPv6 interface identifier */
150 EUI64_TO_IFID(in6);
151
152 return 0;
153 }
154
155 static int
156 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
157 {
158 MD5_CTX ctxt;
159 u_int8_t seed[16], digest[16], nullbuf[8];
160 u_int32_t val32;
161
162 /* If there's no history, start with a random seed. */
163 bzero(nullbuf, sizeof(nullbuf));
164 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
165 int i;
166
167 for (i = 0; i < 2; i++) {
168 val32 = arc4random();
169 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
170 }
171 } else
172 bcopy(seed0, seed, 8);
173
174 /* copy the right-most 64-bits of the given address */
175 /* XXX assumption on the size of IFID */
176 bcopy(seed1, &seed[8], 8);
177
178 if (0) { /* for debugging purposes only */
179 int i;
180
181 printf("generate_tmp_ifid: new randomized ID from: ");
182 for (i = 0; i < 16; i++)
183 printf("%02x", seed[i]);
184 printf(" ");
185 }
186
187 /* generate 16 bytes of pseudo-random value. */
188 bzero(&ctxt, sizeof(ctxt));
189 MD5Init(&ctxt);
190 MD5Update(&ctxt, seed, sizeof(seed));
191 MD5Final(digest, &ctxt);
192
193 /*
194 * RFC 3041 3.2.1. (3)
195 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
196 * left-most bit is numbered 0) to zero.
197 */
198 bcopy(digest, ret, 8);
199 ret[0] &= ~EUI64_UBIT;
200
201 /*
202 * XXX: we'd like to ensure that the generated value is not zero
203 * for simplicity. If the caclculated digest happens to be zero,
204 * use a random non-zero value as the last resort.
205 */
206 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
207 nd6log((LOG_INFO,
208 "generate_tmp_ifid: computed MD5 value is zero.\n"));
209
210 val32 = arc4random();
211 val32 = 1 + (val32 % (0xffffffff - 1));
212 }
213
214 /*
215 * RFC 3041 3.2.1. (4)
216 * Take the rightmost 64-bits of the MD5 digest and save them in
217 * stable storage as the history value to be used in the next
218 * iteration of the algorithm.
219 */
220 bcopy(&digest[8], seed0, 8);
221
222 if (0) { /* for debugging purposes only */
223 int i;
224
225 printf("to: ");
226 for (i = 0; i < 16; i++)
227 printf("%02x", digest[i]);
228 printf("\n");
229 }
230
231 return 0;
232 }
233
234 /*
235 * Get interface identifier for the specified interface.
236 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
237 *
238 * in6 - upper 64bits are preserved
239 */
240 int
241 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
242 {
243 struct ifaddr *ifa;
244 struct sockaddr_dl *sdl;
245 u_int8_t *addr;
246 size_t addrlen;
247 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
248 static u_int8_t allone[8] =
249 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
250
251 IF_ADDR_RLOCK(ifp);
252 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
253 if (ifa->ifa_addr->sa_family != AF_LINK)
254 continue;
255 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
256 if (sdl == NULL)
257 continue;
258 if (sdl->sdl_alen == 0)
259 continue;
260
261 goto found;
262 }
263 IF_ADDR_RUNLOCK(ifp);
264
265 return -1;
266
267 found:
268 IF_ADDR_LOCK_ASSERT(ifp);
269 addr = LLADDR(sdl);
270 addrlen = sdl->sdl_alen;
271
272 /* get EUI64 */
273 switch (ifp->if_type) {
274 case IFT_BRIDGE:
275 case IFT_ETHER:
276 case IFT_L2VLAN:
277 case IFT_ATM:
278 case IFT_IEEE1394:
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_GIF:
320 case IFT_STF:
321 /*
322 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
323 * however, IPv4 address is not very suitable as unique
324 * identifier source (can be renumbered).
325 * we don't do this.
326 */
327 IF_ADDR_RUNLOCK(ifp);
328 return -1;
329
330 case IFT_INFINIBAND:
331 if (addrlen != 20) {
332 IF_ADDR_RUNLOCK(ifp);
333 return -1;
334 }
335 bcopy(addr + 12, &in6->s6_addr[8], 8);
336 break;
337
338 default:
339 IF_ADDR_RUNLOCK(ifp);
340 return -1;
341 }
342
343 /* sanity check: g bit must not indicate "group" */
344 if (EUI64_GROUP(in6)) {
345 IF_ADDR_RUNLOCK(ifp);
346 return -1;
347 }
348
349 /* convert EUI64 into IPv6 interface identifier */
350 EUI64_TO_IFID(in6);
351
352 /*
353 * sanity check: ifid must not be all zero, avoid conflict with
354 * subnet router anycast
355 */
356 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
357 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
358 IF_ADDR_RUNLOCK(ifp);
359 return -1;
360 }
361
362 IF_ADDR_RUNLOCK(ifp);
363 return 0;
364 }
365
366 /*
367 * Get interface identifier for the specified interface. If it is not
368 * available on ifp0, borrow interface identifier from other information
369 * sources.
370 *
371 * altifp - secondary EUI64 source
372 */
373 static int
374 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
375 struct in6_addr *in6)
376 {
377 struct ifnet *ifp;
378
379 /* first, try to get it from the interface itself */
380 if (in6_get_hw_ifid(ifp0, in6) == 0) {
381 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
382 if_name(ifp0)));
383 goto success;
384 }
385
386 /* try secondary EUI64 source. this basically is for ATM PVC */
387 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
388 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
389 if_name(ifp0), if_name(altifp)));
390 goto success;
391 }
392
393 /* next, try to get it from some other hardware interface */
394 IFNET_RLOCK_NOSLEEP();
395 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
396 if (ifp == ifp0)
397 continue;
398 if (in6_get_hw_ifid(ifp, in6) != 0)
399 continue;
400
401 /*
402 * to borrow ifid from other interface, ifid needs to be
403 * globally unique
404 */
405 if (IFID_UNIVERSAL(in6)) {
406 nd6log((LOG_DEBUG,
407 "%s: borrow interface identifier from %s\n",
408 if_name(ifp0), if_name(ifp)));
409 IFNET_RUNLOCK_NOSLEEP();
410 goto success;
411 }
412 }
413 IFNET_RUNLOCK_NOSLEEP();
414
415 /* last resort: get from random number source */
416 if (get_rand_ifid(ifp, in6) == 0) {
417 nd6log((LOG_DEBUG,
418 "%s: interface identifier generated by random number\n",
419 if_name(ifp0)));
420 goto success;
421 }
422
423 printf("%s: failed to get interface identifier\n", if_name(ifp0));
424 return -1;
425
426 success:
427 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
428 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
429 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
430 in6->s6_addr[14], in6->s6_addr[15]));
431 return 0;
432 }
433
434 /*
435 * altifp - secondary EUI64 source
436 */
437 static int
438 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
439 {
440 struct in6_ifaddr *ia;
441 struct in6_aliasreq ifra;
442 struct nd_prefixctl pr0;
443 struct nd_prefix *pr;
444 int error;
445
446 /*
447 * configure link-local address.
448 */
449 in6_prepare_ifra(&ifra, NULL, &in6mask64);
450
451 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
452 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
453 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
454 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
455 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
456 } else {
457 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
458 nd6log((LOG_ERR,
459 "%s: no ifid available\n", if_name(ifp)));
460 return (-1);
461 }
462 }
463 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
464 return (-1);
465
466 /* link-local addresses should NEVER expire. */
467 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
468 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
469
470 /*
471 * Now call in6_update_ifa() to do a bunch of procedures to configure
472 * a link-local address. We can set the 3rd argument to NULL, because
473 * we know there's no other link-local address on the interface
474 * and therefore we are adding one (instead of updating one).
475 */
476 if ((error = in6_update_ifa(ifp, &ifra, NULL,
477 IN6_IFAUPDATE_DADDELAY)) != 0) {
478 /*
479 * XXX: When the interface does not support IPv6, this call
480 * would fail in the SIOCSIFADDR ioctl. I believe the
481 * notification is rather confusing in this case, so just
482 * suppress it. (jinmei@kame.net 20010130)
483 */
484 if (error != EAFNOSUPPORT)
485 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
486 "configure a link-local address on %s "
487 "(errno=%d)\n",
488 if_name(ifp), error));
489 return (-1);
490 }
491
492 ia = in6ifa_ifpforlinklocal(ifp, 0);
493 if (ia == NULL) {
494 /*
495 * Another thread removed the address that we just added.
496 * This should be rare, but it happens.
497 */
498 nd6log((LOG_NOTICE, "%s: %s: new link-local address "
499 "disappeared\n", __func__, if_name(ifp)));
500 return (-1);
501 }
502 ifa_free(&ia->ia_ifa);
503
504 /*
505 * Make the link-local prefix (fe80::%link/64) as on-link.
506 * Since we'd like to manage prefixes separately from addresses,
507 * we make an ND6 prefix structure for the link-local prefix,
508 * and add it to the prefix list as a never-expire prefix.
509 * XXX: this change might affect some existing code base...
510 */
511 bzero(&pr0, sizeof(pr0));
512 pr0.ndpr_ifp = ifp;
513 /* this should be 64 at this moment. */
514 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
515 pr0.ndpr_prefix = ifra.ifra_addr;
516 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
517 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64);
518 /*
519 * Initialize parameters. The link-local prefix must always be
520 * on-link, and its lifetimes never expire.
521 */
522 pr0.ndpr_raf_onlink = 1;
523 pr0.ndpr_raf_auto = 1; /* probably meaningless */
524 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
525 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
526 /*
527 * Since there is no other link-local addresses, nd6_prefix_lookup()
528 * probably returns NULL. However, we cannot always expect the result.
529 * For example, if we first remove the (only) existing link-local
530 * address, and then reconfigure another one, the prefix is still
531 * valid with referring to the old link-local address.
532 */
533 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
534 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
535 return (error);
536 } else
537 nd6_prefix_rele(pr);
538
539 return 0;
540 }
541
542 /*
543 * ifp - must be IFT_LOOP
544 */
545 static int
546 in6_ifattach_loopback(struct ifnet *ifp)
547 {
548 struct in6_aliasreq ifra;
549 int error;
550
551 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128);
552
553 /*
554 * Always initialize ia_dstaddr (= broadcast address) to loopback
555 * address. Follows IPv4 practice - see in_ifinit().
556 */
557 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
558 ifra.ifra_dstaddr.sin6_family = AF_INET6;
559 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
560
561 /* the loopback address should NEVER expire. */
562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
564
565 /*
566 * We are sure that this is a newly assigned address, so we can set
567 * NULL to the 3rd arg.
568 */
569 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
570 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
571 "the loopback address on %s (errno=%d)\n",
572 if_name(ifp), error));
573 return (-1);
574 }
575
576 return 0;
577 }
578
579 /*
580 * compute NI group address, based on the current hostname setting.
581 * see RFC 4620.
582 *
583 * when ifp == NULL, the caller is responsible for filling scopeid.
584 *
585 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
586 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
587 */
588 static int
589 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
590 struct in6_addr *in6, int oldmcprefix)
591 {
592 struct prison *pr;
593 const char *p;
594 u_char *q;
595 MD5_CTX ctxt;
596 u_int8_t digest[16];
597 char l;
598 char n[64]; /* a single label must not exceed 63 chars */
599
600 /*
601 * If no name is given and namelen is -1,
602 * we try to do the hostname lookup ourselves.
603 */
604 if (!name && namelen == -1) {
605 pr = curthread->td_ucred->cr_prison;
606 mtx_lock(&pr->pr_mtx);
607 name = pr->pr_hostname;
608 namelen = strlen(name);
609 } else
610 pr = NULL;
611 if (!name || !namelen) {
612 if (pr != NULL)
613 mtx_unlock(&pr->pr_mtx);
614 return -1;
615 }
616
617 p = name;
618 while (p && *p && *p != '.' && p - name < namelen)
619 p++;
620 if (p == name || p - name > sizeof(n) - 1) {
621 if (pr != NULL)
622 mtx_unlock(&pr->pr_mtx);
623 return -1; /* label too long */
624 }
625 l = p - name;
626 strncpy(n, name, l);
627 if (pr != NULL)
628 mtx_unlock(&pr->pr_mtx);
629 n[(int)l] = '\0';
630 for (q = n; *q; q++) {
631 if ('A' <= *q && *q <= 'Z')
632 *q = *q - 'A' + 'a';
633 }
634
635 /* generate 16 bytes of pseudo-random value. */
636 bzero(&ctxt, sizeof(ctxt));
637 MD5Init(&ctxt);
638 MD5Update(&ctxt, &l, sizeof(l));
639 MD5Update(&ctxt, n, l);
640 MD5Final(digest, &ctxt);
641
642 bzero(in6, sizeof(*in6));
643 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
644 in6->s6_addr8[11] = 2;
645 if (oldmcprefix == 0) {
646 in6->s6_addr8[12] = 0xff;
647 /* Copy the first 24 bits of 128-bit hash into the address. */
648 bcopy(digest, &in6->s6_addr8[13], 3);
649 } else {
650 /* Copy the first 32 bits of 128-bit hash into the address. */
651 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
652 }
653 if (in6_setscope(in6, ifp, NULL))
654 return (-1); /* XXX: should not fail */
655
656 return 0;
657 }
658
659 int
660 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
661 struct in6_addr *in6)
662 {
663
664 return (in6_nigroup0(ifp, name, namelen, in6, 0));
665 }
666
667 int
668 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
669 struct in6_addr *in6)
670 {
671
672 return (in6_nigroup0(ifp, name, namelen, in6, 1));
673 }
674
675 /*
676 * XXX multiple loopback interface needs more care. for instance,
677 * nodelocal address needs to be configured onto only one of them.
678 * XXX multiple link-local address case
679 *
680 * altifp - secondary EUI64 source
681 */
682 void
683 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
684 {
685 struct in6_ifaddr *ia;
686
687 if (ifp->if_afdata[AF_INET6] == NULL)
688 return;
689 /*
690 * quirks based on interface type
691 */
692 switch (ifp->if_type) {
693 case IFT_STF:
694 /*
695 * 6to4 interface is a very special kind of beast.
696 * no multicast, no linklocal. RFC2529 specifies how to make
697 * linklocals for 6to4 interface, but there's no use and
698 * it is rather harmful to have one.
699 */
700 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
701 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD;
702 break;
703 default:
704 break;
705 }
706
707 /*
708 * usually, we require multicast capability to the interface
709 */
710 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
711 nd6log((LOG_INFO, "in6_ifattach: "
712 "%s is not multicast capable, IPv6 not enabled\n",
713 if_name(ifp)));
714 return;
715 }
716
717 /*
718 * assign loopback address for loopback interface.
719 */
720 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
721 /*
722 * check that loopback address doesn't exist yet.
723 */
724 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0);
725 if (ia == NULL)
726 in6_ifattach_loopback(ifp);
727 else
728 ifa_free(&ia->ia_ifa);
729 }
730
731 /*
732 * assign a link-local address, if there's none.
733 */
734 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
735 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
736 ia = in6ifa_ifpforlinklocal(ifp, 0);
737 if (ia == NULL)
738 in6_ifattach_linklocal(ifp, altifp);
739 else
740 ifa_free(&ia->ia_ifa);
741 }
742
743 /* update dynamically. */
744 if (V_in6_maxmtu < ifp->if_mtu)
745 V_in6_maxmtu = ifp->if_mtu;
746 }
747
748 /*
749 * NOTE: in6_ifdetach() does not support loopback if at this moment.
750 *
751 * When shutting down a VNET we clean up layers top-down. In that case
752 * upper layer protocols (ulp) are cleaned up already and locks are destroyed
753 * and we must not call into these cleanup functions anymore, thus purgeulp
754 * is set to 0 in that case by in6_ifdetach_destroy().
755 * The normal case of destroying a (cloned) interface still needs to cleanup
756 * everything related to the interface and will have purgeulp set to 1.
757 */
758 static void
759 _in6_ifdetach(struct ifnet *ifp, int purgeulp)
760 {
761 struct ifaddr *ifa, *next;
762
763 if (ifp->if_afdata[AF_INET6] == NULL)
764 return;
765
766 /*
767 * nuke any of IPv6 addresses we have
768 */
769 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
770 if (ifa->ifa_addr->sa_family != AF_INET6)
771 continue;
772 in6_purgeaddr(ifa);
773 }
774 if (purgeulp) {
775 IN6_MULTI_LOCK();
776 in6_pcbpurgeif0(&V_udbinfo, ifp);
777 in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
778 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
779 IN6_MULTI_UNLOCK();
780 }
781 /* leave from all multicast groups joined */
782 in6_purgemaddrs(ifp);
783
784 /*
785 * Remove neighbor management table.
786 * Enabling the nd6_purge will panic on vmove for interfaces on VNET
787 * teardown as the IPv6 layer is cleaned up already and the locks
788 * are destroyed.
789 */
790 if (purgeulp)
791 nd6_purge(ifp);
792 }
793
794 void
795 in6_ifdetach(struct ifnet *ifp)
796 {
797
798 _in6_ifdetach(ifp, 1);
799 }
800
801 void
802 in6_ifdetach_destroy(struct ifnet *ifp)
803 {
804
805 _in6_ifdetach(ifp, 0);
806 }
807
808 int
809 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
810 const u_int8_t *baseid, int generate)
811 {
812 u_int8_t nullbuf[8];
813 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
814
815 bzero(nullbuf, sizeof(nullbuf));
816 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
817 /* we've never created a random ID. Create a new one. */
818 generate = 1;
819 }
820
821 if (generate) {
822 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
823
824 /* generate_tmp_ifid will update seedn and buf */
825 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
826 ndi->randomid);
827 }
828 bcopy(ndi->randomid, retbuf, 8);
829
830 return (0);
831 }
832
833 void
834 in6_tmpaddrtimer(void *arg)
835 {
836 CURVNET_SET((struct vnet *) arg);
837 struct nd_ifinfo *ndi;
838 u_int8_t nullbuf[8];
839 struct ifnet *ifp;
840
841 callout_reset(&V_in6_tmpaddrtimer_ch,
842 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
843 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
844
845 bzero(nullbuf, sizeof(nullbuf));
846 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
847 if (ifp->if_afdata[AF_INET6] == NULL)
848 continue;
849 ndi = ND_IFINFO(ifp);
850 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
851 /*
852 * We've been generating a random ID on this interface.
853 * Create a new one.
854 */
855 (void)generate_tmp_ifid(ndi->randomseed0,
856 ndi->randomseed1, ndi->randomid);
857 }
858 }
859
860 CURVNET_RESTORE();
861 }
862
863 static void
864 in6_purgemaddrs(struct ifnet *ifp)
865 {
866 struct in6_multi_head inmh;
867
868 SLIST_INIT(&inmh);
869 IN6_MULTI_LOCK();
870 IN6_MULTI_LIST_LOCK();
871 mld_ifdetach(ifp, &inmh);
872 IN6_MULTI_LIST_UNLOCK();
873 IN6_MULTI_UNLOCK();
874 in6m_release_list_deferred(&inmh);
875
876 /*
877 * Make sure all multicast deletions invoking if_ioctl() are
878 * completed before returning. Else we risk accessing a freed
879 * ifnet structure pointer.
880 */
881 in6m_release_wait(NULL);
882 }
883
884 void
885 in6_ifattach_destroy(void)
886 {
887
888 callout_drain(&V_in6_tmpaddrtimer_ch);
889 }
890
891 static void
892 in6_ifattach_init(void *dummy)
893 {
894
895 /* Timer for regeneranation of temporary addresses randomize ID. */
896 callout_init(&V_in6_tmpaddrtimer_ch, 0);
897 callout_reset(&V_in6_tmpaddrtimer_ch,
898 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
899 V_ip6_temp_regen_advance) * hz,
900 in6_tmpaddrtimer, curvnet);
901 }
902
903 /*
904 * Cheat.
905 * This must be after route_init(), which is now SI_ORDER_THIRD.
906 */
907 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
908 in6_ifattach_init, NULL);
Cache object: 2e9551591f5a2e09017cf8026fd08416
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