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/param.h>
35 #include <sys/systm.h>
36 #include <sys/malloc.h>
37 #include <sys/socket.h>
38 #include <sys/sockio.h>
39 #include <sys/jail.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/proc.h>
43 #include <sys/rmlock.h>
44 #include <sys/syslog.h>
45 #include <sys/md5.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_dl.h>
50 #include <net/if_private.h>
51 #include <net/if_types.h>
52 #include <net/route.h>
53 #include <net/vnet.h>
54
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/if_ether.h>
58 #include <netinet/in_pcb.h>
59 #include <netinet/ip_var.h>
60 #include <netinet/udp.h>
61 #include <netinet/udp_var.h>
62
63 #include <netinet/ip6.h>
64 #include <netinet6/ip6_var.h>
65 #include <netinet6/in6_var.h>
66 #include <netinet6/in6_pcb.h>
67 #include <netinet6/in6_ifattach.h>
68 #include <netinet6/ip6_var.h>
69 #include <netinet6/nd6.h>
70 #include <netinet6/mld6_var.h>
71 #include <netinet6/scope6_var.h>
72
73 VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
74
75 #ifdef IP6_AUTO_LINKLOCAL
76 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
77 #else
78 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
79 #endif
80
81 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
82 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
83
84 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
85 #define V_ripcbinfo VNET(ripcbinfo)
86
87 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
88 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
89 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
90 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
91 static int in6_ifattach_loopback(struct ifnet *);
92 static void in6_purgemaddrs(struct ifnet *);
93
94 #define EUI64_GBIT 0x01
95 #define EUI64_UBIT 0x02
96 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
97 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
98 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
99 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
100 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
101
102 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
103 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
104
105 /*
106 * Generate a last-resort interface identifier, when the machine has no
107 * IEEE802/EUI64 address sources.
108 * The goal here is to get an interface identifier that is
109 * (1) random enough and (2) does not change across reboot.
110 * We currently use MD5(hostname) for it.
111 *
112 * in6 - upper 64bits are preserved
113 */
114 static int
get_rand_ifid(struct ifnet * ifp,struct in6_addr * in6)115 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
116 {
117 MD5_CTX ctxt;
118 struct prison *pr;
119 u_int8_t digest[16];
120 int hostnamelen;
121
122 pr = curthread->td_ucred->cr_prison;
123 mtx_lock(&pr->pr_mtx);
124 hostnamelen = strlen(pr->pr_hostname);
125 #if 0
126 /* we need at least several letters as seed for ifid */
127 if (hostnamelen < 3) {
128 mtx_unlock(&pr->pr_mtx);
129 return -1;
130 }
131 #endif
132
133 /* generate 8 bytes of pseudo-random value. */
134 bzero(&ctxt, sizeof(ctxt));
135 MD5Init(&ctxt);
136 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
137 mtx_unlock(&pr->pr_mtx);
138 MD5Final(digest, &ctxt);
139
140 /* assumes sizeof(digest) > sizeof(ifid) */
141 bcopy(digest, &in6->s6_addr[8], 8);
142
143 /* make sure to set "u" bit to local, and "g" bit to individual. */
144 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
145 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
146
147 /* convert EUI64 into IPv6 interface identifier */
148 EUI64_TO_IFID(in6);
149
150 return 0;
151 }
152
153 static int
generate_tmp_ifid(u_int8_t * seed0,const u_int8_t * seed1,u_int8_t * ret)154 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
155 {
156 MD5_CTX ctxt;
157 u_int8_t seed[16], digest[16], nullbuf[8];
158 u_int32_t val32;
159
160 /* If there's no history, start with a random seed. */
161 bzero(nullbuf, sizeof(nullbuf));
162 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
163 int i;
164
165 for (i = 0; i < 2; i++) {
166 val32 = arc4random();
167 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
168 }
169 } else
170 bcopy(seed0, seed, 8);
171
172 /* copy the right-most 64-bits of the given address */
173 /* XXX assumption on the size of IFID */
174 bcopy(seed1, &seed[8], 8);
175
176 if (0) { /* for debugging purposes only */
177 int i;
178
179 printf("generate_tmp_ifid: new randomized ID from: ");
180 for (i = 0; i < 16; i++)
181 printf("%02x", seed[i]);
182 printf(" ");
183 }
184
185 /* generate 16 bytes of pseudo-random value. */
186 bzero(&ctxt, sizeof(ctxt));
187 MD5Init(&ctxt);
188 MD5Update(&ctxt, seed, sizeof(seed));
189 MD5Final(digest, &ctxt);
190
191 /*
192 * RFC 3041 3.2.1. (3)
193 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
194 * left-most bit is numbered 0) to zero.
195 */
196 bcopy(digest, ret, 8);
197 ret[0] &= ~EUI64_UBIT;
198
199 /*
200 * XXX: we'd like to ensure that the generated value is not zero
201 * for simplicity. If the caclculated digest happens to be zero,
202 * use a random non-zero value as the last resort.
203 */
204 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
205 nd6log((LOG_INFO,
206 "generate_tmp_ifid: computed MD5 value is zero.\n"));
207
208 val32 = arc4random();
209 val32 = 1 + (val32 % (0xffffffff - 1));
210 }
211
212 /*
213 * RFC 3041 3.2.1. (4)
214 * Take the rightmost 64-bits of the MD5 digest and save them in
215 * stable storage as the history value to be used in the next
216 * iteration of the algorithm.
217 */
218 bcopy(&digest[8], seed0, 8);
219
220 if (0) { /* for debugging purposes only */
221 int i;
222
223 printf("to: ");
224 for (i = 0; i < 16; i++)
225 printf("%02x", digest[i]);
226 printf("\n");
227 }
228
229 return 0;
230 }
231
232 /*
233 * Get interface identifier for the specified interface.
234 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
235 *
236 * in6 - upper 64bits are preserved
237 */
238 int
in6_get_hw_ifid(struct ifnet * ifp,struct in6_addr * in6)239 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
240 {
241 struct ifaddr *ifa;
242 struct sockaddr_dl *sdl;
243 u_int8_t *addr;
244 size_t addrlen;
245 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
246 static u_int8_t allone[8] =
247 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
248
249 NET_EPOCH_ASSERT();
250
251 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
252 if (ifa->ifa_addr->sa_family != AF_LINK)
253 continue;
254 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
255 if (sdl == NULL)
256 continue;
257 if (sdl->sdl_alen == 0)
258 continue;
259
260 goto found;
261 }
262
263 return -1;
264
265 found:
266 addr = LLADDR(sdl);
267 addrlen = sdl->sdl_alen;
268
269 /* get EUI64 */
270 switch (ifp->if_type) {
271 case IFT_BRIDGE:
272 case IFT_ETHER:
273 case IFT_L2VLAN:
274 case IFT_ATM:
275 case IFT_IEEE1394:
276 /* IEEE802/EUI64 cases - what others? */
277 /* IEEE1394 uses 16byte length address starting with EUI64 */
278 if (addrlen > 8)
279 addrlen = 8;
280
281 /* look at IEEE802/EUI64 only */
282 if (addrlen != 8 && addrlen != 6)
283 return -1;
284
285 /*
286 * check for invalid MAC address - on bsdi, we see it a lot
287 * since wildboar configures all-zero MAC on pccard before
288 * card insertion.
289 */
290 if (bcmp(addr, allzero, addrlen) == 0)
291 return -1;
292 if (bcmp(addr, allone, addrlen) == 0)
293 return -1;
294
295 /* make EUI64 address */
296 if (addrlen == 8)
297 bcopy(addr, &in6->s6_addr[8], 8);
298 else if (addrlen == 6) {
299 in6->s6_addr[8] = addr[0];
300 in6->s6_addr[9] = addr[1];
301 in6->s6_addr[10] = addr[2];
302 in6->s6_addr[11] = 0xff;
303 in6->s6_addr[12] = 0xfe;
304 in6->s6_addr[13] = addr[3];
305 in6->s6_addr[14] = addr[4];
306 in6->s6_addr[15] = addr[5];
307 }
308 break;
309
310 case IFT_GIF:
311 case IFT_STF:
312 /*
313 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
314 * however, IPv4 address is not very suitable as unique
315 * identifier source (can be renumbered).
316 * we don't do this.
317 */
318 return -1;
319
320 case IFT_INFINIBAND:
321 if (addrlen != 20)
322 return -1;
323 bcopy(addr + 12, &in6->s6_addr[8], 8);
324 break;
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 return 0;
346 }
347
348 /*
349 * Get interface identifier for the specified interface. If it is not
350 * available on ifp0, borrow interface identifier from other information
351 * sources.
352 *
353 * altifp - secondary EUI64 source
354 */
355 static int
get_ifid(struct ifnet * ifp0,struct ifnet * altifp,struct in6_addr * in6)356 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
357 struct in6_addr *in6)
358 {
359 struct ifnet *ifp;
360
361 NET_EPOCH_ASSERT();
362
363 /* first, try to get it from the interface itself */
364 if (in6_get_hw_ifid(ifp0, in6) == 0) {
365 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
366 if_name(ifp0)));
367 goto success;
368 }
369
370 /* try secondary EUI64 source. this basically is for ATM PVC */
371 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
372 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
373 if_name(ifp0), if_name(altifp)));
374 goto success;
375 }
376
377 /* next, try to get it from some other hardware interface */
378 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
379 if (ifp == ifp0)
380 continue;
381 if (in6_get_hw_ifid(ifp, in6) != 0)
382 continue;
383
384 /*
385 * to borrow ifid from other interface, ifid needs to be
386 * globally unique
387 */
388 if (IFID_UNIVERSAL(in6)) {
389 nd6log((LOG_DEBUG,
390 "%s: borrow interface identifier from %s\n",
391 if_name(ifp0), if_name(ifp)));
392 goto success;
393 }
394 }
395
396 /* last resort: get from random number source */
397 if (get_rand_ifid(ifp, in6) == 0) {
398 nd6log((LOG_DEBUG,
399 "%s: interface identifier generated by random number\n",
400 if_name(ifp0)));
401 goto success;
402 }
403
404 printf("%s: failed to get interface identifier\n", if_name(ifp0));
405 return -1;
406
407 success:
408 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
409 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
410 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
411 in6->s6_addr[14], in6->s6_addr[15]));
412 return 0;
413 }
414
415 /*
416 * altifp - secondary EUI64 source
417 */
418 static int
in6_ifattach_linklocal(struct ifnet * ifp,struct ifnet * altifp)419 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
420 {
421 struct in6_ifaddr *ia;
422 struct in6_aliasreq ifra;
423 struct nd_prefixctl pr0;
424 struct epoch_tracker et;
425 struct nd_prefix *pr;
426 int error;
427
428 /*
429 * configure link-local address.
430 */
431 in6_prepare_ifra(&ifra, NULL, &in6mask64);
432
433 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
434 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
435 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
436 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
437 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
438 } else {
439 NET_EPOCH_ENTER(et);
440 error = get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr);
441 NET_EPOCH_EXIT(et);
442 if (error != 0) {
443 nd6log((LOG_ERR,
444 "%s: no ifid available\n", if_name(ifp)));
445 return (-1);
446 }
447 }
448 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
449 return (-1);
450
451 /* link-local addresses should NEVER expire. */
452 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
453 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
454
455 /*
456 * Now call in6_update_ifa() to do a bunch of procedures to configure
457 * a link-local address. We can set the 3rd argument to NULL, because
458 * we know there's no other link-local address on the interface
459 * and therefore we are adding one (instead of updating one).
460 */
461 if ((error = in6_update_ifa(ifp, &ifra, NULL,
462 IN6_IFAUPDATE_DADDELAY)) != 0) {
463 /*
464 * XXX: When the interface does not support IPv6, this call
465 * would fail in the SIOCSIFADDR ioctl. I believe the
466 * notification is rather confusing in this case, so just
467 * suppress it. (jinmei@kame.net 20010130)
468 */
469 if (error != EAFNOSUPPORT)
470 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
471 "configure a link-local address on %s "
472 "(errno=%d)\n",
473 if_name(ifp), error));
474 return (-1);
475 }
476
477 NET_EPOCH_ENTER(et);
478 ia = in6ifa_ifpforlinklocal(ifp, 0);
479 NET_EPOCH_EXIT(et);
480 if (ia == NULL) {
481 /*
482 * Another thread removed the address that we just added.
483 * This should be rare, but it happens.
484 */
485 nd6log((LOG_NOTICE, "%s: %s: new link-local address "
486 "disappeared\n", __func__, if_name(ifp)));
487 return (-1);
488 }
489 ifa_free(&ia->ia_ifa);
490
491 /*
492 * Make the link-local prefix (fe80::%link/64) as on-link.
493 * Since we'd like to manage prefixes separately from addresses,
494 * we make an ND6 prefix structure for the link-local prefix,
495 * and add it to the prefix list as a never-expire prefix.
496 * XXX: this change might affect some existing code base...
497 */
498 bzero(&pr0, sizeof(pr0));
499 pr0.ndpr_ifp = ifp;
500 /* this should be 64 at this moment. */
501 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
502 pr0.ndpr_prefix = ifra.ifra_addr;
503 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
504 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64);
505 /*
506 * Initialize parameters. The link-local prefix must always be
507 * on-link, and its lifetimes never expire.
508 */
509 pr0.ndpr_raf_onlink = 1;
510 pr0.ndpr_raf_auto = 1; /* probably meaningless */
511 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
512 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
513 /*
514 * Since there is no other link-local addresses, nd6_prefix_lookup()
515 * probably returns NULL. However, we cannot always expect the result.
516 * For example, if we first remove the (only) existing link-local
517 * address, and then reconfigure another one, the prefix is still
518 * valid with referring to the old link-local address.
519 */
520 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
521 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
522 return (error);
523 /* Reference prefix */
524 ia->ia6_ndpr = pr;
525 pr->ndpr_addrcnt++;
526 } else
527 nd6_prefix_rele(pr);
528
529 return 0;
530 }
531
532 /*
533 * ifp - must be IFT_LOOP
534 */
535 static int
in6_ifattach_loopback(struct ifnet * ifp)536 in6_ifattach_loopback(struct ifnet *ifp)
537 {
538 struct in6_aliasreq ifra;
539 int error;
540
541 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128);
542
543 /*
544 * Always initialize ia_dstaddr (= broadcast address) to loopback
545 * address. Follows IPv4 practice - see in_ifinit().
546 */
547 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
548 ifra.ifra_dstaddr.sin6_family = AF_INET6;
549 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
550
551 /* the loopback address should NEVER expire. */
552 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
553 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
554
555 /*
556 * We are sure that this is a newly assigned address, so we can set
557 * NULL to the 3rd arg.
558 */
559 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
560 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
561 "the loopback address on %s (errno=%d)\n",
562 if_name(ifp), error));
563 return (-1);
564 }
565
566 return 0;
567 }
568
569 /*
570 * compute NI group address, based on the current hostname setting.
571 * see RFC 4620.
572 *
573 * when ifp == NULL, the caller is responsible for filling scopeid.
574 *
575 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
576 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
577 */
578 static int
in6_nigroup0(struct ifnet * ifp,const char * name,int namelen,struct in6_addr * in6,int oldmcprefix)579 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
580 struct in6_addr *in6, int oldmcprefix)
581 {
582 struct prison *pr;
583 const char *p;
584 u_char *q;
585 MD5_CTX ctxt;
586 u_int8_t digest[16];
587 char l;
588 char n[64]; /* a single label must not exceed 63 chars */
589
590 /*
591 * If no name is given and namelen is -1,
592 * we try to do the hostname lookup ourselves.
593 */
594 if (!name && namelen == -1) {
595 pr = curthread->td_ucred->cr_prison;
596 mtx_lock(&pr->pr_mtx);
597 name = pr->pr_hostname;
598 namelen = strlen(name);
599 } else
600 pr = NULL;
601 if (!name || !namelen) {
602 if (pr != NULL)
603 mtx_unlock(&pr->pr_mtx);
604 return -1;
605 }
606
607 p = name;
608 while (p && *p && *p != '.' && p - name < namelen)
609 p++;
610 if (p == name || p - name > sizeof(n) - 1) {
611 if (pr != NULL)
612 mtx_unlock(&pr->pr_mtx);
613 return -1; /* label too long */
614 }
615 l = p - name;
616 strncpy(n, name, l);
617 if (pr != NULL)
618 mtx_unlock(&pr->pr_mtx);
619 n[(int)l] = '\0';
620 for (q = n; *q; q++) {
621 if ('A' <= *q && *q <= 'Z')
622 *q = *q - 'A' + 'a';
623 }
624
625 /* generate 16 bytes of pseudo-random value. */
626 bzero(&ctxt, sizeof(ctxt));
627 MD5Init(&ctxt);
628 MD5Update(&ctxt, &l, sizeof(l));
629 MD5Update(&ctxt, n, l);
630 MD5Final(digest, &ctxt);
631
632 bzero(in6, sizeof(*in6));
633 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
634 in6->s6_addr8[11] = 2;
635 if (oldmcprefix == 0) {
636 in6->s6_addr8[12] = 0xff;
637 /* Copy the first 24 bits of 128-bit hash into the address. */
638 bcopy(digest, &in6->s6_addr8[13], 3);
639 } else {
640 /* Copy the first 32 bits of 128-bit hash into the address. */
641 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
642 }
643 if (in6_setscope(in6, ifp, NULL))
644 return (-1); /* XXX: should not fail */
645
646 return 0;
647 }
648
649 int
in6_nigroup(struct ifnet * ifp,const char * name,int namelen,struct in6_addr * in6)650 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
651 struct in6_addr *in6)
652 {
653
654 return (in6_nigroup0(ifp, name, namelen, in6, 0));
655 }
656
657 int
in6_nigroup_oldmcprefix(struct ifnet * ifp,const char * name,int namelen,struct in6_addr * in6)658 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
659 struct in6_addr *in6)
660 {
661
662 return (in6_nigroup0(ifp, name, namelen, in6, 1));
663 }
664
665 /*
666 * XXX multiple loopback interface needs more care. for instance,
667 * nodelocal address needs to be configured onto only one of them.
668 * XXX multiple link-local address case
669 *
670 * altifp - secondary EUI64 source
671 */
672 void
in6_ifattach(struct ifnet * ifp,struct ifnet * altifp)673 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
674 {
675 struct in6_ifaddr *ia;
676
677 if (ifp->if_afdata[AF_INET6] == NULL)
678 return;
679 /*
680 * quirks based on interface type
681 */
682 switch (ifp->if_type) {
683 case IFT_STF:
684 /*
685 * 6to4 interface is a very special kind of beast.
686 * no multicast, no linklocal. RFC2529 specifies how to make
687 * linklocals for 6to4 interface, but there's no use and
688 * it is rather harmful to have one.
689 */
690 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
691 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD;
692 break;
693 default:
694 break;
695 }
696
697 /*
698 * usually, we require multicast capability to the interface
699 */
700 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
701 nd6log((LOG_INFO, "in6_ifattach: "
702 "%s is not multicast capable, IPv6 not enabled\n",
703 if_name(ifp)));
704 return;
705 }
706
707 /*
708 * assign loopback address for loopback interface.
709 */
710 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
711 /*
712 * check that loopback address doesn't exist yet.
713 */
714 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0, false);
715 if (ia == NULL)
716 in6_ifattach_loopback(ifp);
717 }
718
719 /*
720 * assign a link-local address, if there's none.
721 */
722 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
723 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
724 struct epoch_tracker et;
725
726 NET_EPOCH_ENTER(et);
727 ia = in6ifa_ifpforlinklocal(ifp, 0);
728 NET_EPOCH_EXIT(et);
729 if (ia == NULL)
730 in6_ifattach_linklocal(ifp, altifp);
731 else
732 ifa_free(&ia->ia_ifa);
733 }
734
735 /* update dynamically. */
736 if (V_in6_maxmtu < ifp->if_mtu)
737 V_in6_maxmtu = ifp->if_mtu;
738 }
739
740 /*
741 * NOTE: in6_ifdetach() does not support loopback if at this moment.
742 *
743 * When shutting down a VNET we clean up layers top-down. In that case
744 * upper layer protocols (ulp) are cleaned up already and locks are destroyed
745 * and we must not call into these cleanup functions anymore, thus purgeulp
746 * is set to 0 in that case by in6_ifdetach_destroy().
747 * The normal case of destroying a (cloned) interface still needs to cleanup
748 * everything related to the interface and will have purgeulp set to 1.
749 */
750 static void
_in6_ifdetach(struct ifnet * ifp,int purgeulp)751 _in6_ifdetach(struct ifnet *ifp, int purgeulp)
752 {
753 struct ifaddr *ifa, *next;
754
755 if (ifp->if_afdata[AF_INET6] == NULL)
756 return;
757
758 /*
759 * nuke any of IPv6 addresses we have
760 */
761 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
762 if (ifa->ifa_addr->sa_family != AF_INET6)
763 continue;
764 in6_purgeaddr(ifa);
765 }
766 if (purgeulp) {
767 IN6_MULTI_LOCK();
768 in6_pcbpurgeif0(&V_udbinfo, ifp);
769 in6_pcbpurgeif0(&V_ulitecbinfo, ifp);
770 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
771 IN6_MULTI_UNLOCK();
772 }
773 /* leave from all multicast groups joined */
774 in6_purgemaddrs(ifp);
775
776 /*
777 * Remove neighbor management table.
778 * Enabling the nd6_purge will panic on vmove for interfaces on VNET
779 * teardown as the IPv6 layer is cleaned up already and the locks
780 * are destroyed.
781 */
782 if (purgeulp)
783 nd6_purge(ifp);
784 }
785
786 void
in6_ifdetach(struct ifnet * ifp)787 in6_ifdetach(struct ifnet *ifp)
788 {
789
790 _in6_ifdetach(ifp, 1);
791 }
792
793 void
in6_ifdetach_destroy(struct ifnet * ifp)794 in6_ifdetach_destroy(struct ifnet *ifp)
795 {
796
797 _in6_ifdetach(ifp, 0);
798 }
799
800 int
in6_get_tmpifid(struct ifnet * ifp,u_int8_t * retbuf,const u_int8_t * baseid,int generate)801 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
802 const u_int8_t *baseid, int generate)
803 {
804 u_int8_t nullbuf[8];
805 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
806
807 bzero(nullbuf, sizeof(nullbuf));
808 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
809 /* we've never created a random ID. Create a new one. */
810 generate = 1;
811 }
812
813 if (generate) {
814 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
815
816 /* generate_tmp_ifid will update seedn and buf */
817 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
818 ndi->randomid);
819 }
820 bcopy(ndi->randomid, retbuf, 8);
821
822 return (0);
823 }
824
825 void
in6_tmpaddrtimer(void * arg)826 in6_tmpaddrtimer(void *arg)
827 {
828 CURVNET_SET((struct vnet *) arg);
829 struct epoch_tracker et;
830 struct nd_ifinfo *ndi;
831 u_int8_t nullbuf[8];
832 struct ifnet *ifp;
833
834 callout_reset(&V_in6_tmpaddrtimer_ch,
835 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
836 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
837
838 bzero(nullbuf, sizeof(nullbuf));
839 NET_EPOCH_ENTER(et);
840 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
841 if (ifp->if_afdata[AF_INET6] == NULL)
842 continue;
843 ndi = ND_IFINFO(ifp);
844 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
845 /*
846 * We've been generating a random ID on this interface.
847 * Create a new one.
848 */
849 (void)generate_tmp_ifid(ndi->randomseed0,
850 ndi->randomseed1, ndi->randomid);
851 }
852 }
853 NET_EPOCH_EXIT(et);
854 CURVNET_RESTORE();
855 }
856
857 static void
in6_purgemaddrs(struct ifnet * ifp)858 in6_purgemaddrs(struct ifnet *ifp)
859 {
860 struct in6_multi_head inmh;
861
862 SLIST_INIT(&inmh);
863 IN6_MULTI_LOCK();
864 IN6_MULTI_LIST_LOCK();
865 mld_ifdetach(ifp, &inmh);
866 IN6_MULTI_LIST_UNLOCK();
867 IN6_MULTI_UNLOCK();
868 in6m_release_list_deferred(&inmh);
869
870 /*
871 * Make sure all multicast deletions invoking if_ioctl() are
872 * completed before returning. Else we risk accessing a freed
873 * ifnet structure pointer.
874 */
875 in6m_release_wait(NULL);
876 }
877
878 void
in6_ifattach_destroy(void)879 in6_ifattach_destroy(void)
880 {
881
882 callout_drain(&V_in6_tmpaddrtimer_ch);
883 }
884
885 static void
in6_ifattach_init(void * dummy)886 in6_ifattach_init(void *dummy)
887 {
888
889 /* Timer for regeneranation of temporary addresses randomize ID. */
890 callout_init(&V_in6_tmpaddrtimer_ch, 1);
891 callout_reset(&V_in6_tmpaddrtimer_ch,
892 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
893 V_ip6_temp_regen_advance) * hz,
894 in6_tmpaddrtimer, curvnet);
895 }
896
897 /*
898 * Cheat.
899 * This must be after route_init(), which is now SI_ORDER_THIRD.
900 */
901 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE,
902 in6_ifattach_init, NULL);
903