FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /* $FreeBSD: releng/6.1/sys/netinet6/in6.c 161685 2006-08-28 07:31:11Z cperciva $ */
2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*-
34 * Copyright (c) 1982, 1986, 1991, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)in.c 8.2 (Berkeley) 11/15/93
62 */
63
64 #include "opt_inet.h"
65 #include "opt_inet6.h"
66
67 #include <sys/param.h>
68 #include <sys/errno.h>
69 #include <sys/malloc.h>
70 #include <sys/socket.h>
71 #include <sys/socketvar.h>
72 #include <sys/sockio.h>
73 #include <sys/systm.h>
74 #include <sys/proc.h>
75 #include <sys/time.h>
76 #include <sys/kernel.h>
77 #include <sys/syslog.h>
78
79 #include <net/if.h>
80 #include <net/if_types.h>
81 #include <net/route.h>
82 #include <net/if_dl.h>
83
84 #include <netinet/in.h>
85 #include <netinet/in_var.h>
86 #include <netinet/if_ether.h>
87 #include <netinet/in_systm.h>
88 #include <netinet/ip.h>
89 #include <netinet/in_pcb.h>
90
91 #include <netinet/ip6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet6/nd6.h>
94 #include <netinet6/mld6_var.h>
95 #include <netinet6/ip6_mroute.h>
96 #include <netinet6/in6_ifattach.h>
97 #include <netinet6/scope6_var.h>
98 #include <netinet6/in6_pcb.h>
99
100 #include <net/net_osdep.h>
101
102 MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "internet multicast address");
103
104 /*
105 * Definitions of some costant IP6 addresses.
106 */
107 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
108 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
109 const struct in6_addr in6addr_nodelocal_allnodes =
110 IN6ADDR_NODELOCAL_ALLNODES_INIT;
111 const struct in6_addr in6addr_linklocal_allnodes =
112 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
113 const struct in6_addr in6addr_linklocal_allrouters =
114 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
115
116 const struct in6_addr in6mask0 = IN6MASK0;
117 const struct in6_addr in6mask32 = IN6MASK32;
118 const struct in6_addr in6mask64 = IN6MASK64;
119 const struct in6_addr in6mask96 = IN6MASK96;
120 const struct in6_addr in6mask128 = IN6MASK128;
121
122 const struct sockaddr_in6 sa6_any =
123 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
124
125 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
126 struct ifnet *, struct thread *));
127 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
128 struct sockaddr_in6 *, int));
129 static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *));
130
131 struct in6_multihead in6_multihead; /* XXX BSS initialization */
132 int (*faithprefix_p)(struct in6_addr *);
133
134 /*
135 * Subroutine for in6_ifaddloop() and in6_ifremloop().
136 * This routine does actual work.
137 */
138 static void
139 in6_ifloop_request(int cmd, struct ifaddr *ifa)
140 {
141 struct sockaddr_in6 all1_sa;
142 struct rtentry *nrt = NULL;
143 int e;
144
145 bzero(&all1_sa, sizeof(all1_sa));
146 all1_sa.sin6_family = AF_INET6;
147 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
148 all1_sa.sin6_addr = in6mask128;
149
150 /*
151 * We specify the address itself as the gateway, and set the
152 * RTF_LLINFO flag, so that the corresponding host route would have
153 * the flag, and thus applications that assume traditional behavior
154 * would be happy. Note that we assume the caller of the function
155 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
156 * which changes the outgoing interface to the loopback interface.
157 */
158 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
159 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
160 if (e != 0) {
161 /* XXX need more descriptive message */
162 log(LOG_ERR, "in6_ifloop_request: "
163 "%s operation failed for %s (errno=%d)\n",
164 cmd == RTM_ADD ? "ADD" : "DELETE",
165 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
166 e);
167 }
168
169 /*
170 * Report the addition/removal of the address to the routing socket.
171 * XXX: since we called rtinit for a p2p interface with a destination,
172 * we end up reporting twice in such a case. Should we rather
173 * omit the second report?
174 */
175 if (nrt) {
176 RT_LOCK(nrt);
177 /*
178 * Make sure rt_ifa be equal to IFA, the second argument of
179 * the function. We need this because when we refer to
180 * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa
181 * points to the address instead of the loopback address.
182 */
183 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) {
184 IFAFREE(nrt->rt_ifa);
185 IFAREF(ifa);
186 nrt->rt_ifa = ifa;
187 }
188
189 rt_newaddrmsg(cmd, ifa, e, nrt);
190 if (cmd == RTM_DELETE) {
191 rtfree(nrt);
192 } else {
193 /* the cmd must be RTM_ADD here */
194 RT_REMREF(nrt);
195 RT_UNLOCK(nrt);
196 }
197 }
198 }
199
200 /*
201 * Add ownaddr as loopback rtentry. We previously add the route only if
202 * necessary (ex. on a p2p link). However, since we now manage addresses
203 * separately from prefixes, we should always add the route. We can't
204 * rely on the cloning mechanism from the corresponding interface route
205 * any more.
206 */
207 void
208 in6_ifaddloop(struct ifaddr *ifa)
209 {
210 struct rtentry *rt;
211 int need_loop;
212
213 /* If there is no loopback entry, allocate one. */
214 rt = rtalloc1(ifa->ifa_addr, 0, 0);
215 need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
216 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0);
217 if (rt)
218 rtfree(rt);
219 if (need_loop)
220 in6_ifloop_request(RTM_ADD, ifa);
221 }
222
223 /*
224 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
225 * if it exists.
226 */
227 void
228 in6_ifremloop(struct ifaddr *ifa)
229 {
230 struct in6_ifaddr *ia;
231 struct rtentry *rt;
232 int ia_count = 0;
233
234 /*
235 * Some of BSD variants do not remove cloned routes
236 * from an interface direct route, when removing the direct route
237 * (see comments in net/net_osdep.h). Even for variants that do remove
238 * cloned routes, they could fail to remove the cloned routes when
239 * we handle multple addresses that share a common prefix.
240 * So, we should remove the route corresponding to the deleted address.
241 */
242
243 /*
244 * Delete the entry only if exact one ifa exists. More than one ifa
245 * can exist if we assign a same single address to multiple
246 * (probably p2p) interfaces.
247 * XXX: we should avoid such a configuration in IPv6...
248 */
249 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
250 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
251 ia_count++;
252 if (ia_count > 1)
253 break;
254 }
255 }
256
257 if (ia_count == 1) {
258 /*
259 * Before deleting, check if a corresponding loopbacked host
260 * route surely exists. With this check, we can avoid to
261 * delete an interface direct route whose destination is same
262 * as the address being removed. This can happen when removing
263 * a subnet-router anycast address on an interface attahced
264 * to a shared medium.
265 */
266 rt = rtalloc1(ifa->ifa_addr, 0, 0);
267 if (rt != NULL) {
268 if ((rt->rt_flags & RTF_HOST) != 0 &&
269 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
270 rtfree(rt);
271 in6_ifloop_request(RTM_DELETE, ifa);
272 } else
273 RT_UNLOCK(rt);
274 }
275 }
276 }
277
278 int
279 in6_mask2len(mask, lim0)
280 struct in6_addr *mask;
281 u_char *lim0;
282 {
283 int x = 0, y;
284 u_char *lim = lim0, *p;
285
286 /* ignore the scope_id part */
287 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
288 lim = (u_char *)mask + sizeof(*mask);
289 for (p = (u_char *)mask; p < lim; x++, p++) {
290 if (*p != 0xff)
291 break;
292 }
293 y = 0;
294 if (p < lim) {
295 for (y = 0; y < 8; y++) {
296 if ((*p & (0x80 >> y)) == 0)
297 break;
298 }
299 }
300
301 /*
302 * when the limit pointer is given, do a stricter check on the
303 * remaining bits.
304 */
305 if (p < lim) {
306 if (y != 0 && (*p & (0x00ff >> y)) != 0)
307 return (-1);
308 for (p = p + 1; p < lim; p++)
309 if (*p != 0)
310 return (-1);
311 }
312
313 return x * 8 + y;
314 }
315
316 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
317 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
318
319 int
320 in6_control(so, cmd, data, ifp, td)
321 struct socket *so;
322 u_long cmd;
323 caddr_t data;
324 struct ifnet *ifp;
325 struct thread *td;
326 {
327 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
328 struct in6_ifaddr *ia = NULL;
329 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
330 int error, privileged;
331 struct sockaddr_in6 *sa6;
332
333 privileged = 0;
334 if (td == NULL || !suser(td))
335 privileged++;
336
337 switch (cmd) {
338 case SIOCGETSGCNT_IN6:
339 case SIOCGETMIFCNT_IN6:
340 return (mrt6_ioctl(cmd, data));
341 }
342
343 switch(cmd) {
344 case SIOCAADDRCTL_POLICY:
345 case SIOCDADDRCTL_POLICY:
346 if (!privileged)
347 return (EPERM);
348 return (in6_src_ioctl(cmd, data));
349 }
350
351 if (ifp == NULL)
352 return (EOPNOTSUPP);
353
354 switch (cmd) {
355 case SIOCSNDFLUSH_IN6:
356 case SIOCSPFXFLUSH_IN6:
357 case SIOCSRTRFLUSH_IN6:
358 case SIOCSDEFIFACE_IN6:
359 case SIOCSIFINFO_FLAGS:
360 if (!privileged)
361 return (EPERM);
362 /* FALLTHROUGH */
363 case OSIOCGIFINFO_IN6:
364 case SIOCGIFINFO_IN6:
365 case SIOCSIFINFO_IN6:
366 case SIOCGDRLST_IN6:
367 case SIOCGPRLST_IN6:
368 case SIOCGNBRINFO_IN6:
369 case SIOCGDEFIFACE_IN6:
370 return (nd6_ioctl(cmd, data, ifp));
371 }
372
373 switch (cmd) {
374 case SIOCSIFPREFIX_IN6:
375 case SIOCDIFPREFIX_IN6:
376 case SIOCAIFPREFIX_IN6:
377 case SIOCCIFPREFIX_IN6:
378 case SIOCSGIFPREFIX_IN6:
379 case SIOCGIFPREFIX_IN6:
380 log(LOG_NOTICE,
381 "prefix ioctls are now invalidated. "
382 "please use ifconfig.\n");
383 return (EOPNOTSUPP);
384 }
385
386 switch (cmd) {
387 case SIOCSSCOPE6:
388 if (!privileged)
389 return (EPERM);
390 return (scope6_set(ifp,
391 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
392 case SIOCGSCOPE6:
393 return (scope6_get(ifp,
394 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
395 case SIOCGSCOPE6DEF:
396 return (scope6_get_default((struct scope6_id *)
397 ifr->ifr_ifru.ifru_scope_id));
398 }
399
400 switch (cmd) {
401 case SIOCALIFADDR:
402 case SIOCDLIFADDR:
403 if (!privileged)
404 return (EPERM);
405 /* FALLTHROUGH */
406 case SIOCGLIFADDR:
407 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
408 }
409
410 /*
411 * Find address for this interface, if it exists.
412 *
413 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
414 * only, and used the first interface address as the target of other
415 * operations (without checking ifra_addr). This was because netinet
416 * code/API assumed at most 1 interface address per interface.
417 * Since IPv6 allows a node to assign multiple addresses
418 * on a single interface, we almost always look and check the
419 * presence of ifra_addr, and reject invalid ones here.
420 * It also decreases duplicated code among SIOC*_IN6 operations.
421 */
422 switch (cmd) {
423 case SIOCAIFADDR_IN6:
424 case SIOCSIFPHYADDR_IN6:
425 sa6 = &ifra->ifra_addr;
426 break;
427 case SIOCSIFADDR_IN6:
428 case SIOCGIFADDR_IN6:
429 case SIOCSIFDSTADDR_IN6:
430 case SIOCSIFNETMASK_IN6:
431 case SIOCGIFDSTADDR_IN6:
432 case SIOCGIFNETMASK_IN6:
433 case SIOCDIFADDR_IN6:
434 case SIOCGIFPSRCADDR_IN6:
435 case SIOCGIFPDSTADDR_IN6:
436 case SIOCGIFAFLAG_IN6:
437 case SIOCSNDFLUSH_IN6:
438 case SIOCSPFXFLUSH_IN6:
439 case SIOCSRTRFLUSH_IN6:
440 case SIOCGIFALIFETIME_IN6:
441 case SIOCSIFALIFETIME_IN6:
442 case SIOCGIFSTAT_IN6:
443 case SIOCGIFSTAT_ICMP6:
444 sa6 = &ifr->ifr_addr;
445 break;
446 default:
447 sa6 = NULL;
448 break;
449 }
450 if (sa6 && sa6->sin6_family == AF_INET6) {
451 int error = 0;
452
453 if (sa6->sin6_scope_id != 0)
454 error = sa6_embedscope(sa6, 0);
455 else
456 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
457 if (error != 0)
458 return (error);
459 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
460 } else
461 ia = NULL;
462
463 switch (cmd) {
464 case SIOCSIFADDR_IN6:
465 case SIOCSIFDSTADDR_IN6:
466 case SIOCSIFNETMASK_IN6:
467 /*
468 * Since IPv6 allows a node to assign multiple addresses
469 * on a single interface, SIOCSIFxxx ioctls are deprecated.
470 */
471 /* we decided to obsolete this command (20000704) */
472 return (EINVAL);
473
474 case SIOCDIFADDR_IN6:
475 /*
476 * for IPv4, we look for existing in_ifaddr here to allow
477 * "ifconfig if0 delete" to remove the first IPv4 address on
478 * the interface. For IPv6, as the spec allows multiple
479 * interface address from the day one, we consider "remove the
480 * first one" semantics to be not preferable.
481 */
482 if (ia == NULL)
483 return (EADDRNOTAVAIL);
484 /* FALLTHROUGH */
485 case SIOCAIFADDR_IN6:
486 /*
487 * We always require users to specify a valid IPv6 address for
488 * the corresponding operation.
489 */
490 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
491 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
492 return (EAFNOSUPPORT);
493 if (!privileged)
494 return (EPERM);
495
496 break;
497
498 case SIOCGIFADDR_IN6:
499 /* This interface is basically deprecated. use SIOCGIFCONF. */
500 /* FALLTHROUGH */
501 case SIOCGIFAFLAG_IN6:
502 case SIOCGIFNETMASK_IN6:
503 case SIOCGIFDSTADDR_IN6:
504 case SIOCGIFALIFETIME_IN6:
505 /* must think again about its semantics */
506 if (ia == NULL)
507 return (EADDRNOTAVAIL);
508 break;
509 case SIOCSIFALIFETIME_IN6:
510 {
511 struct in6_addrlifetime *lt;
512
513 if (!privileged)
514 return (EPERM);
515 if (ia == NULL)
516 return (EADDRNOTAVAIL);
517 /* sanity for overflow - beware unsigned */
518 lt = &ifr->ifr_ifru.ifru_lifetime;
519 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
520 lt->ia6t_vltime + time_second < time_second) {
521 return EINVAL;
522 }
523 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
524 lt->ia6t_pltime + time_second < time_second) {
525 return EINVAL;
526 }
527 break;
528 }
529 }
530
531 switch (cmd) {
532
533 case SIOCGIFADDR_IN6:
534 ifr->ifr_addr = ia->ia_addr;
535 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
536 return (error);
537 break;
538
539 case SIOCGIFDSTADDR_IN6:
540 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
541 return (EINVAL);
542 /*
543 * XXX: should we check if ifa_dstaddr is NULL and return
544 * an error?
545 */
546 ifr->ifr_dstaddr = ia->ia_dstaddr;
547 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
548 return (error);
549 break;
550
551 case SIOCGIFNETMASK_IN6:
552 ifr->ifr_addr = ia->ia_prefixmask;
553 break;
554
555 case SIOCGIFAFLAG_IN6:
556 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
557 break;
558
559 case SIOCGIFSTAT_IN6:
560 if (ifp == NULL)
561 return EINVAL;
562 bzero(&ifr->ifr_ifru.ifru_stat,
563 sizeof(ifr->ifr_ifru.ifru_stat));
564 ifr->ifr_ifru.ifru_stat =
565 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
566 break;
567
568 case SIOCGIFSTAT_ICMP6:
569 if (ifp == NULL)
570 return EINVAL;
571 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
572 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
573 ifr->ifr_ifru.ifru_icmp6stat =
574 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
575 break;
576
577 case SIOCGIFALIFETIME_IN6:
578 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
579 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
580 time_t maxexpire;
581 struct in6_addrlifetime *retlt =
582 &ifr->ifr_ifru.ifru_lifetime;
583
584 /*
585 * XXX: adjust expiration time assuming time_t is
586 * signed.
587 */
588 maxexpire = (-1) &
589 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
590 if (ia->ia6_lifetime.ia6t_vltime <
591 maxexpire - ia->ia6_updatetime) {
592 retlt->ia6t_expire = ia->ia6_updatetime +
593 ia->ia6_lifetime.ia6t_vltime;
594 } else
595 retlt->ia6t_expire = maxexpire;
596 }
597 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
598 time_t maxexpire;
599 struct in6_addrlifetime *retlt =
600 &ifr->ifr_ifru.ifru_lifetime;
601
602 /*
603 * XXX: adjust expiration time assuming time_t is
604 * signed.
605 */
606 maxexpire = (-1) &
607 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
608 if (ia->ia6_lifetime.ia6t_pltime <
609 maxexpire - ia->ia6_updatetime) {
610 retlt->ia6t_preferred = ia->ia6_updatetime +
611 ia->ia6_lifetime.ia6t_pltime;
612 } else
613 retlt->ia6t_preferred = maxexpire;
614 }
615 break;
616
617 case SIOCSIFALIFETIME_IN6:
618 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
619 /* for sanity */
620 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
621 ia->ia6_lifetime.ia6t_expire =
622 time_second + ia->ia6_lifetime.ia6t_vltime;
623 } else
624 ia->ia6_lifetime.ia6t_expire = 0;
625 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
626 ia->ia6_lifetime.ia6t_preferred =
627 time_second + ia->ia6_lifetime.ia6t_pltime;
628 } else
629 ia->ia6_lifetime.ia6t_preferred = 0;
630 break;
631
632 case SIOCAIFADDR_IN6:
633 {
634 int i, error = 0;
635 struct nd_prefixctl pr0;
636 struct nd_prefix *pr;
637
638 /*
639 * first, make or update the interface address structure,
640 * and link it to the list.
641 */
642 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
643 return (error);
644 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
645 == NULL) {
646 /*
647 * this can happen when the user specify the 0 valid
648 * lifetime.
649 */
650 break;
651 }
652
653 /*
654 * then, make the prefix on-link on the interface.
655 * XXX: we'd rather create the prefix before the address, but
656 * we need at least one address to install the corresponding
657 * interface route, so we configure the address first.
658 */
659
660 /*
661 * convert mask to prefix length (prefixmask has already
662 * been validated in in6_update_ifa().
663 */
664 bzero(&pr0, sizeof(pr0));
665 pr0.ndpr_ifp = ifp;
666 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
667 NULL);
668 if (pr0.ndpr_plen == 128) {
669 break; /* we don't need to install a host route. */
670 }
671 pr0.ndpr_prefix = ifra->ifra_addr;
672 /* apply the mask for safety. */
673 for (i = 0; i < 4; i++) {
674 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
675 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
676 }
677 /*
678 * XXX: since we don't have an API to set prefix (not address)
679 * lifetimes, we just use the same lifetimes as addresses.
680 * The (temporarily) installed lifetimes can be overridden by
681 * later advertised RAs (when accept_rtadv is non 0), which is
682 * an intended behavior.
683 */
684 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
685 pr0.ndpr_raf_auto =
686 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
687 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
688 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
689
690 /* add the prefix if not yet. */
691 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
692 /*
693 * nd6_prelist_add will install the corresponding
694 * interface route.
695 */
696 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
697 return (error);
698 if (pr == NULL) {
699 log(LOG_ERR, "nd6_prelist_add succeeded but "
700 "no prefix\n");
701 return (EINVAL); /* XXX panic here? */
702 }
703 }
704
705 /* relate the address to the prefix */
706 if (ia->ia6_ndpr == NULL) {
707 ia->ia6_ndpr = pr;
708 pr->ndpr_refcnt++;
709
710 /*
711 * If this is the first autoconf address from the
712 * prefix, create a temporary address as well
713 * (when required).
714 */
715 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
716 ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
717 int e;
718 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
719 log(LOG_NOTICE, "in6_control: failed "
720 "to create a temporary address, "
721 "errno=%d\n", e);
722 }
723 }
724 }
725
726 /*
727 * this might affect the status of autoconfigured addresses,
728 * that is, this address might make other addresses detached.
729 */
730 pfxlist_onlink_check();
731 if (error == 0 && ia)
732 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
733 break;
734 }
735
736 case SIOCDIFADDR_IN6:
737 {
738 struct nd_prefix *pr;
739
740 /*
741 * If the address being deleted is the only one that owns
742 * the corresponding prefix, expire the prefix as well.
743 * XXX: theoretically, we don't have to worry about such
744 * relationship, since we separate the address management
745 * and the prefix management. We do this, however, to provide
746 * as much backward compatibility as possible in terms of
747 * the ioctl operation.
748 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
749 */
750 pr = ia->ia6_ndpr;
751 in6_purgeaddr(&ia->ia_ifa);
752 if (pr && pr->ndpr_refcnt == 0)
753 prelist_remove(pr);
754 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
755 break;
756 }
757
758 default:
759 if (ifp == NULL || ifp->if_ioctl == 0)
760 return (EOPNOTSUPP);
761 return ((*ifp->if_ioctl)(ifp, cmd, data));
762 }
763
764 return (0);
765 }
766
767 /*
768 * Update parameters of an IPv6 interface address.
769 * If necessary, a new entry is created and linked into address chains.
770 * This function is separated from in6_control().
771 * XXX: should this be performed under splnet()?
772 */
773 int
774 in6_update_ifa(ifp, ifra, ia, flags)
775 struct ifnet *ifp;
776 struct in6_aliasreq *ifra;
777 struct in6_ifaddr *ia;
778 int flags;
779 {
780 int error = 0, hostIsNew = 0, plen = -1;
781 struct in6_ifaddr *oia;
782 struct sockaddr_in6 dst6;
783 struct in6_addrlifetime *lt;
784 struct in6_multi_mship *imm;
785 struct in6_multi *in6m_sol;
786 struct rtentry *rt;
787 int delay;
788
789 /* Validate parameters */
790 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
791 return (EINVAL);
792
793 /*
794 * The destination address for a p2p link must have a family
795 * of AF_UNSPEC or AF_INET6.
796 */
797 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
798 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
799 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
800 return (EAFNOSUPPORT);
801 /*
802 * validate ifra_prefixmask. don't check sin6_family, netmask
803 * does not carry fields other than sin6_len.
804 */
805 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
806 return (EINVAL);
807 /*
808 * Because the IPv6 address architecture is classless, we require
809 * users to specify a (non 0) prefix length (mask) for a new address.
810 * We also require the prefix (when specified) mask is valid, and thus
811 * reject a non-consecutive mask.
812 */
813 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
814 return (EINVAL);
815 if (ifra->ifra_prefixmask.sin6_len != 0) {
816 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
817 (u_char *)&ifra->ifra_prefixmask +
818 ifra->ifra_prefixmask.sin6_len);
819 if (plen <= 0)
820 return (EINVAL);
821 } else {
822 /*
823 * In this case, ia must not be NULL. We just use its prefix
824 * length.
825 */
826 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
827 }
828 /*
829 * If the destination address on a p2p interface is specified,
830 * and the address is a scoped one, validate/set the scope
831 * zone identifier.
832 */
833 dst6 = ifra->ifra_dstaddr;
834 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
835 (dst6.sin6_family == AF_INET6)) {
836 struct in6_addr in6_tmp;
837 u_int32_t zoneid;
838
839 in6_tmp = dst6.sin6_addr;
840 if (in6_setscope(&in6_tmp, ifp, &zoneid))
841 return (EINVAL); /* XXX: should be impossible */
842
843 if (dst6.sin6_scope_id != 0) {
844 if (dst6.sin6_scope_id != zoneid)
845 return (EINVAL);
846 } else /* user omit to specify the ID. */
847 dst6.sin6_scope_id = zoneid;
848
849 /* convert into the internal form */
850 if (sa6_embedscope(&dst6, 0))
851 return (EINVAL); /* XXX: should be impossible */
852 }
853 /*
854 * The destination address can be specified only for a p2p or a
855 * loopback interface. If specified, the corresponding prefix length
856 * must be 128.
857 */
858 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
859 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
860 /* XXX: noisy message */
861 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
862 "be specified for a p2p or a loopback IF only\n"));
863 return (EINVAL);
864 }
865 if (plen != 128) {
866 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
867 "be 128 when dstaddr is specified\n"));
868 return (EINVAL);
869 }
870 }
871 /* lifetime consistency check */
872 lt = &ifra->ifra_lifetime;
873 if (lt->ia6t_pltime > lt->ia6t_vltime)
874 return (EINVAL);
875 if (lt->ia6t_vltime == 0) {
876 /*
877 * the following log might be noisy, but this is a typical
878 * configuration mistake or a tool's bug.
879 */
880 nd6log((LOG_INFO,
881 "in6_update_ifa: valid lifetime is 0 for %s\n",
882 ip6_sprintf(&ifra->ifra_addr.sin6_addr)));
883
884 if (ia == NULL)
885 return (0); /* there's nothing to do */
886 }
887
888 /*
889 * If this is a new address, allocate a new ifaddr and link it
890 * into chains.
891 */
892 if (ia == NULL) {
893 hostIsNew = 1;
894 /*
895 * When in6_update_ifa() is called in a process of a received
896 * RA, it is called under an interrupt context. So, we should
897 * call malloc with M_NOWAIT.
898 */
899 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
900 M_NOWAIT);
901 if (ia == NULL)
902 return (ENOBUFS);
903 bzero((caddr_t)ia, sizeof(*ia));
904 /* Initialize the address and masks, and put time stamp */
905 IFA_LOCK_INIT(&ia->ia_ifa);
906 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
907 ia->ia_addr.sin6_family = AF_INET6;
908 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
909 ia->ia6_createtime = time_second;
910 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
911 /*
912 * XXX: some functions expect that ifa_dstaddr is not
913 * NULL for p2p interfaces.
914 */
915 ia->ia_ifa.ifa_dstaddr =
916 (struct sockaddr *)&ia->ia_dstaddr;
917 } else {
918 ia->ia_ifa.ifa_dstaddr = NULL;
919 }
920 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
921
922 ia->ia_ifp = ifp;
923 if ((oia = in6_ifaddr) != NULL) {
924 for ( ; oia->ia_next; oia = oia->ia_next)
925 continue;
926 oia->ia_next = ia;
927 } else
928 in6_ifaddr = ia;
929
930 ia->ia_ifa.ifa_refcnt = 1;
931 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
932 }
933
934 /* update timestamp */
935 ia->ia6_updatetime = time_second;
936
937 /* set prefix mask */
938 if (ifra->ifra_prefixmask.sin6_len) {
939 /*
940 * We prohibit changing the prefix length of an existing
941 * address, because
942 * + such an operation should be rare in IPv6, and
943 * + the operation would confuse prefix management.
944 */
945 if (ia->ia_prefixmask.sin6_len &&
946 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
947 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
948 " existing (%s) address should not be changed\n",
949 ip6_sprintf(&ia->ia_addr.sin6_addr)));
950 error = EINVAL;
951 goto unlink;
952 }
953 ia->ia_prefixmask = ifra->ifra_prefixmask;
954 }
955
956 /*
957 * If a new destination address is specified, scrub the old one and
958 * install the new destination. Note that the interface must be
959 * p2p or loopback (see the check above.)
960 */
961 if (dst6.sin6_family == AF_INET6 &&
962 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
963 int e;
964
965 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
966 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
967 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
968 "a route to the old destination: %s\n",
969 ip6_sprintf(&ia->ia_addr.sin6_addr)));
970 /* proceed anyway... */
971 } else
972 ia->ia_flags &= ~IFA_ROUTE;
973 ia->ia_dstaddr = dst6;
974 }
975
976 /*
977 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
978 * to see if the address is deprecated or invalidated, but initialize
979 * these members for applications.
980 */
981 ia->ia6_lifetime = ifra->ifra_lifetime;
982 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
983 ia->ia6_lifetime.ia6t_expire =
984 time_second + ia->ia6_lifetime.ia6t_vltime;
985 } else
986 ia->ia6_lifetime.ia6t_expire = 0;
987 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
988 ia->ia6_lifetime.ia6t_preferred =
989 time_second + ia->ia6_lifetime.ia6t_pltime;
990 } else
991 ia->ia6_lifetime.ia6t_preferred = 0;
992
993 /* reset the interface and routing table appropriately. */
994 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
995 goto unlink;
996
997 /*
998 * configure address flags.
999 */
1000 ia->ia6_flags = ifra->ifra_flags;
1001 /*
1002 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1003 * userland, make it deprecated.
1004 */
1005 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1006 ia->ia6_lifetime.ia6t_pltime = 0;
1007 ia->ia6_lifetime.ia6t_preferred = time_second;
1008 }
1009 /*
1010 * Make the address tentative before joining multicast addresses,
1011 * so that corresponding MLD responses would not have a tentative
1012 * source address.
1013 */
1014 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1015 if (hostIsNew && in6if_do_dad(ifp))
1016 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1017
1018 /*
1019 * We are done if we have simply modified an existing address.
1020 */
1021 if (!hostIsNew)
1022 return (error);
1023
1024 /*
1025 * Beyond this point, we should call in6_purgeaddr upon an error,
1026 * not just go to unlink.
1027 */
1028
1029 /* Join necessary multicast groups */
1030 in6m_sol = NULL;
1031 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1032 struct sockaddr_in6 mltaddr, mltmask;
1033 struct in6_addr llsol;
1034
1035 /* join solicited multicast addr for new host id */
1036 bzero(&llsol, sizeof(struct in6_addr));
1037 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
1038 llsol.s6_addr32[1] = 0;
1039 llsol.s6_addr32[2] = htonl(1);
1040 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
1041 llsol.s6_addr8[12] = 0xff;
1042 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
1043 /* XXX: should not happen */
1044 log(LOG_ERR, "in6_update_ifa: "
1045 "in6_setscope failed\n");
1046 goto cleanup;
1047 }
1048 delay = 0;
1049 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1050 /*
1051 * We need a random delay for DAD on the address
1052 * being configured. It also means delaying
1053 * transmission of the corresponding MLD report to
1054 * avoid report collision.
1055 * [draft-ietf-ipv6-rfc2462bis-02.txt]
1056 */
1057 delay = arc4random() %
1058 (MAX_RTR_SOLICITATION_DELAY * hz);
1059 }
1060 imm = in6_joingroup(ifp, &llsol, &error, delay);
1061 if (error != 0) {
1062 nd6log((LOG_WARNING,
1063 "in6_update_ifa: addmulti failed for "
1064 "%s on %s (errno=%d)\n",
1065 ip6_sprintf(&llsol), if_name(ifp),
1066 error));
1067 in6_purgeaddr((struct ifaddr *)ia);
1068 return (error);
1069 }
1070 in6m_sol = imm->i6mm_maddr;
1071
1072 bzero(&mltmask, sizeof(mltmask));
1073 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1074 mltmask.sin6_family = AF_INET6;
1075 mltmask.sin6_addr = in6mask32;
1076 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
1077
1078 /*
1079 * join link-local all-nodes address
1080 */
1081 bzero(&mltaddr, sizeof(mltaddr));
1082 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1083 mltaddr.sin6_family = AF_INET6;
1084 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1085 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1086 0)
1087 goto cleanup; /* XXX: should not fail */
1088
1089 /*
1090 * XXX: do we really need this automatic routes?
1091 * We should probably reconsider this stuff. Most applications
1092 * actually do not need the routes, since they usually specify
1093 * the outgoing interface.
1094 */
1095 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1096 if (rt) {
1097 if (memcmp(&mltaddr.sin6_addr,
1098 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1099 MLTMASK_LEN)) {
1100 RTFREE_LOCKED(rt);
1101 rt = NULL;
1102 }
1103 }
1104 if (!rt) {
1105 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
1106 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1107 (struct sockaddr *)&ia->ia_addr,
1108 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1109 (struct rtentry **)0);
1110 if (error)
1111 goto cleanup;
1112 } else
1113 RTFREE_LOCKED(rt);
1114
1115 /*
1116 * XXX: do we really need this automatic routes?
1117 * We should probably reconsider this stuff. Most applications
1118 * actually do not need the routes, since they usually specify
1119 * the outgoing interface.
1120 */
1121 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1122 if (rt) {
1123 /* XXX: only works in !SCOPEDROUTING case. */
1124 if (memcmp(&mltaddr.sin6_addr,
1125 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1126 MLTMASK_LEN)) {
1127 RTFREE_LOCKED(rt);
1128 rt = NULL;
1129 }
1130 }
1131 if (!rt) {
1132 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1133 (struct sockaddr *)&ia->ia_addr,
1134 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1135 (struct rtentry **)0);
1136 if (error)
1137 goto cleanup;
1138 } else {
1139 RTFREE_LOCKED(rt);
1140 }
1141
1142 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1143 if (!imm) {
1144 nd6log((LOG_WARNING,
1145 "in6_update_ifa: addmulti failed for "
1146 "%s on %s (errno=%d)\n",
1147 ip6_sprintf(&mltaddr.sin6_addr),
1148 if_name(ifp), error));
1149 goto cleanup;
1150 }
1151
1152 /*
1153 * join node information group address
1154 */
1155 #define hostnamelen strlen(hostname)
1156 delay = 0;
1157 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1158 /*
1159 * The spec doesn't say anything about delay for this
1160 * group, but the same logic should apply.
1161 */
1162 delay = arc4random() %
1163 (MAX_RTR_SOLICITATION_DELAY * hz);
1164 }
1165 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1166 == 0) {
1167 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
1168 delay); /* XXX jinmei */
1169 if (!imm) {
1170 nd6log((LOG_WARNING, "in6_update_ifa: "
1171 "addmulti failed for %s on %s "
1172 "(errno=%d)\n",
1173 ip6_sprintf(&mltaddr.sin6_addr),
1174 if_name(ifp), error));
1175 /* XXX not very fatal, go on... */
1176 }
1177 }
1178 #undef hostnamelen
1179
1180 /*
1181 * join interface-local all-nodes address.
1182 * (ff01::1%ifN, and ff01::%ifN/32)
1183 */
1184 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1185 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
1186 != 0)
1187 goto cleanup; /* XXX: should not fail */
1188 /* XXX: again, do we really need the route? */
1189 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1190 if (rt) {
1191 if (memcmp(&mltaddr.sin6_addr,
1192 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1193 MLTMASK_LEN)) {
1194 RTFREE_LOCKED(rt);
1195 rt = NULL;
1196 }
1197 }
1198 if (!rt) {
1199 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1200 (struct sockaddr *)&ia->ia_addr,
1201 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1202 (struct rtentry **)0);
1203 if (error)
1204 goto cleanup;
1205 } else
1206 RTFREE_LOCKED(rt);
1207
1208 /* XXX: again, do we really need the route? */
1209 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1210 if (rt) {
1211 if (memcmp(&mltaddr.sin6_addr,
1212 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1213 MLTMASK_LEN)) {
1214 RTFREE_LOCKED(rt);
1215 rt = NULL;
1216 }
1217 }
1218 if (!rt) {
1219 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1220 (struct sockaddr *)&ia->ia_addr,
1221 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1222 (struct rtentry **)0);
1223 if (error)
1224 goto cleanup;
1225 } else {
1226 RTFREE_LOCKED(rt);
1227 }
1228
1229 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1230 if (!imm) {
1231 nd6log((LOG_WARNING, "in6_update_ifa: "
1232 "addmulti failed for %s on %s "
1233 "(errno=%d)\n",
1234 ip6_sprintf(&mltaddr.sin6_addr),
1235 if_name(ifp), error));
1236 goto cleanup;
1237 }
1238 #undef MLTMASK_LEN
1239 }
1240
1241 /*
1242 * Perform DAD, if needed.
1243 * XXX It may be of use, if we can administratively
1244 * disable DAD.
1245 */
1246 if (hostIsNew && in6if_do_dad(ifp) &&
1247 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1248 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1249 {
1250 int mindelay, maxdelay;
1251
1252 delay = 0;
1253 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1254 /*
1255 * We need to impose a delay before sending an NS
1256 * for DAD. Check if we also needed a delay for the
1257 * corresponding MLD message. If we did, the delay
1258 * should be larger than the MLD delay (this could be
1259 * relaxed a bit, but this simple logic is at least
1260 * safe).
1261 */
1262 mindelay = 0;
1263 if (in6m_sol != NULL &&
1264 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1265 mindelay = in6m_sol->in6m_timer;
1266 }
1267 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1268 if (maxdelay - mindelay == 0)
1269 delay = 0;
1270 else {
1271 delay =
1272 (arc4random() % (maxdelay - mindelay)) +
1273 mindelay;
1274 }
1275 }
1276 nd6_dad_start((struct ifaddr *)ia, delay);
1277 }
1278
1279 return (error);
1280
1281 unlink:
1282 /*
1283 * XXX: if a change of an existing address failed, keep the entry
1284 * anyway.
1285 */
1286 if (hostIsNew)
1287 in6_unlink_ifa(ia, ifp);
1288 return (error);
1289
1290 cleanup:
1291 in6_purgeaddr(&ia->ia_ifa);
1292 return error;
1293 }
1294
1295 void
1296 in6_purgeaddr(ifa)
1297 struct ifaddr *ifa;
1298 {
1299 struct ifnet *ifp = ifa->ifa_ifp;
1300 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1301
1302 /* stop DAD processing */
1303 nd6_dad_stop(ifa);
1304
1305 /*
1306 * delete route to the destination of the address being purged.
1307 * The interface must be p2p or loopback in this case.
1308 */
1309 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1310 int e;
1311
1312 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1313 != 0) {
1314 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1315 "a route to the p2p destination: %s on %s, "
1316 "errno=%d\n",
1317 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1318 e);
1319 /* proceed anyway... */
1320 } else
1321 ia->ia_flags &= ~IFA_ROUTE;
1322 }
1323
1324 /* Remove ownaddr's loopback rtentry, if it exists. */
1325 in6_ifremloop(&(ia->ia_ifa));
1326
1327 if (ifp->if_flags & IFF_MULTICAST) {
1328 /*
1329 * delete solicited multicast addr for deleting host id
1330 */
1331 struct in6_multi *in6m;
1332 struct in6_addr llsol;
1333 bzero(&llsol, sizeof(struct in6_addr));
1334 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
1335 llsol.s6_addr32[1] = 0;
1336 llsol.s6_addr32[2] = htonl(1);
1337 llsol.s6_addr32[3] =
1338 ia->ia_addr.sin6_addr.s6_addr32[3];
1339 llsol.s6_addr8[12] = 0xff;
1340 (void)in6_setscope(&llsol, ifp, NULL); /* XXX proceed anyway */
1341
1342 IN6_LOOKUP_MULTI(llsol, ifp, in6m);
1343 if (in6m)
1344 in6_delmulti(in6m);
1345 }
1346
1347 in6_unlink_ifa(ia, ifp);
1348 }
1349
1350 static void
1351 in6_unlink_ifa(ia, ifp)
1352 struct in6_ifaddr *ia;
1353 struct ifnet *ifp;
1354 {
1355 struct in6_ifaddr *oia;
1356 int s = splnet();
1357
1358 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1359
1360 oia = ia;
1361 if (oia == (ia = in6_ifaddr))
1362 in6_ifaddr = ia->ia_next;
1363 else {
1364 while (ia->ia_next && (ia->ia_next != oia))
1365 ia = ia->ia_next;
1366 if (ia->ia_next)
1367 ia->ia_next = oia->ia_next;
1368 else {
1369 /* search failed */
1370 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1371 }
1372 }
1373
1374 /*
1375 * Release the reference to the base prefix. There should be a
1376 * positive reference.
1377 */
1378 if (oia->ia6_ndpr == NULL) {
1379 nd6log((LOG_NOTICE,
1380 "in6_unlink_ifa: autoconf'ed address "
1381 "%p has no prefix\n", oia));
1382 } else {
1383 oia->ia6_ndpr->ndpr_refcnt--;
1384 oia->ia6_ndpr = NULL;
1385 }
1386
1387 /*
1388 * Also, if the address being removed is autoconf'ed, call
1389 * pfxlist_onlink_check() since the release might affect the status of
1390 * other (detached) addresses.
1391 */
1392 if ((oia->ia6_flags & IN6_IFF_AUTOCONF)) {
1393 pfxlist_onlink_check();
1394 }
1395
1396 /*
1397 * release another refcnt for the link from in6_ifaddr.
1398 * Note that we should decrement the refcnt at least once for all *BSD.
1399 */
1400 IFAFREE(&oia->ia_ifa);
1401
1402 splx(s);
1403 }
1404
1405 void
1406 in6_purgeif(ifp)
1407 struct ifnet *ifp;
1408 {
1409 struct ifaddr *ifa, *nifa;
1410
1411 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
1412 nifa = TAILQ_NEXT(ifa, ifa_list);
1413 if (ifa->ifa_addr->sa_family != AF_INET6)
1414 continue;
1415 in6_purgeaddr(ifa);
1416 }
1417
1418 in6_ifdetach(ifp);
1419 }
1420
1421 /*
1422 * SIOC[GAD]LIFADDR.
1423 * SIOCGLIFADDR: get first address. (?)
1424 * SIOCGLIFADDR with IFLR_PREFIX:
1425 * get first address that matches the specified prefix.
1426 * SIOCALIFADDR: add the specified address.
1427 * SIOCALIFADDR with IFLR_PREFIX:
1428 * add the specified prefix, filling hostid part from
1429 * the first link-local address. prefixlen must be <= 64.
1430 * SIOCDLIFADDR: delete the specified address.
1431 * SIOCDLIFADDR with IFLR_PREFIX:
1432 * delete the first address that matches the specified prefix.
1433 * return values:
1434 * EINVAL on invalid parameters
1435 * EADDRNOTAVAIL on prefix match failed/specified address not found
1436 * other values may be returned from in6_ioctl()
1437 *
1438 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1439 * this is to accomodate address naming scheme other than RFC2374,
1440 * in the future.
1441 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1442 * address encoding scheme. (see figure on page 8)
1443 */
1444 static int
1445 in6_lifaddr_ioctl(so, cmd, data, ifp, td)
1446 struct socket *so;
1447 u_long cmd;
1448 caddr_t data;
1449 struct ifnet *ifp;
1450 struct thread *td;
1451 {
1452 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1453 struct ifaddr *ifa;
1454 struct sockaddr *sa;
1455
1456 /* sanity checks */
1457 if (!data || !ifp) {
1458 panic("invalid argument to in6_lifaddr_ioctl");
1459 /* NOTREACHED */
1460 }
1461
1462 switch (cmd) {
1463 case SIOCGLIFADDR:
1464 /* address must be specified on GET with IFLR_PREFIX */
1465 if ((iflr->flags & IFLR_PREFIX) == 0)
1466 break;
1467 /* FALLTHROUGH */
1468 case SIOCALIFADDR:
1469 case SIOCDLIFADDR:
1470 /* address must be specified on ADD and DELETE */
1471 sa = (struct sockaddr *)&iflr->addr;
1472 if (sa->sa_family != AF_INET6)
1473 return EINVAL;
1474 if (sa->sa_len != sizeof(struct sockaddr_in6))
1475 return EINVAL;
1476 /* XXX need improvement */
1477 sa = (struct sockaddr *)&iflr->dstaddr;
1478 if (sa->sa_family && sa->sa_family != AF_INET6)
1479 return EINVAL;
1480 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1481 return EINVAL;
1482 break;
1483 default: /* shouldn't happen */
1484 #if 0
1485 panic("invalid cmd to in6_lifaddr_ioctl");
1486 /* NOTREACHED */
1487 #else
1488 return EOPNOTSUPP;
1489 #endif
1490 }
1491 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1492 return EINVAL;
1493
1494 switch (cmd) {
1495 case SIOCALIFADDR:
1496 {
1497 struct in6_aliasreq ifra;
1498 struct in6_addr *hostid = NULL;
1499 int prefixlen;
1500
1501 if ((iflr->flags & IFLR_PREFIX) != 0) {
1502 struct sockaddr_in6 *sin6;
1503
1504 /*
1505 * hostid is to fill in the hostid part of the
1506 * address. hostid points to the first link-local
1507 * address attached to the interface.
1508 */
1509 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1510 if (!ifa)
1511 return EADDRNOTAVAIL;
1512 hostid = IFA_IN6(ifa);
1513
1514 /* prefixlen must be <= 64. */
1515 if (64 < iflr->prefixlen)
1516 return EINVAL;
1517 prefixlen = iflr->prefixlen;
1518
1519 /* hostid part must be zero. */
1520 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1521 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1522 sin6->sin6_addr.s6_addr32[3] != 0) {
1523 return EINVAL;
1524 }
1525 } else
1526 prefixlen = iflr->prefixlen;
1527
1528 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1529 bzero(&ifra, sizeof(ifra));
1530 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1531
1532 bcopy(&iflr->addr, &ifra.ifra_addr,
1533 ((struct sockaddr *)&iflr->addr)->sa_len);
1534 if (hostid) {
1535 /* fill in hostid part */
1536 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1537 hostid->s6_addr32[2];
1538 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1539 hostid->s6_addr32[3];
1540 }
1541
1542 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1543 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1544 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1545 if (hostid) {
1546 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1547 hostid->s6_addr32[2];
1548 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1549 hostid->s6_addr32[3];
1550 }
1551 }
1552
1553 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1554 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1555
1556 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1557 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1558 }
1559 case SIOCGLIFADDR:
1560 case SIOCDLIFADDR:
1561 {
1562 struct in6_ifaddr *ia;
1563 struct in6_addr mask, candidate, match;
1564 struct sockaddr_in6 *sin6;
1565 int cmp;
1566
1567 bzero(&mask, sizeof(mask));
1568 if (iflr->flags & IFLR_PREFIX) {
1569 /* lookup a prefix rather than address. */
1570 in6_prefixlen2mask(&mask, iflr->prefixlen);
1571
1572 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1573 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1574 match.s6_addr32[0] &= mask.s6_addr32[0];
1575 match.s6_addr32[1] &= mask.s6_addr32[1];
1576 match.s6_addr32[2] &= mask.s6_addr32[2];
1577 match.s6_addr32[3] &= mask.s6_addr32[3];
1578
1579 /* if you set extra bits, that's wrong */
1580 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1581 return EINVAL;
1582
1583 cmp = 1;
1584 } else {
1585 if (cmd == SIOCGLIFADDR) {
1586 /* on getting an address, take the 1st match */
1587 cmp = 0; /* XXX */
1588 } else {
1589 /* on deleting an address, do exact match */
1590 in6_prefixlen2mask(&mask, 128);
1591 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1592 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1593
1594 cmp = 1;
1595 }
1596 }
1597
1598 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1599 if (ifa->ifa_addr->sa_family != AF_INET6)
1600 continue;
1601 if (!cmp)
1602 break;
1603
1604 /*
1605 * XXX: this is adhoc, but is necessary to allow
1606 * a user to specify fe80::/64 (not /10) for a
1607 * link-local address.
1608 */
1609 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1610 in6_clearscope(&candidate);
1611 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1612 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1613 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1614 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1615 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1616 break;
1617 }
1618 if (!ifa)
1619 return EADDRNOTAVAIL;
1620 ia = ifa2ia6(ifa);
1621
1622 if (cmd == SIOCGLIFADDR) {
1623 int error;
1624
1625 /* fill in the if_laddrreq structure */
1626 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1627 error = sa6_recoverscope(
1628 (struct sockaddr_in6 *)&iflr->addr);
1629 if (error != 0)
1630 return (error);
1631
1632 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1633 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1634 ia->ia_dstaddr.sin6_len);
1635 error = sa6_recoverscope(
1636 (struct sockaddr_in6 *)&iflr->dstaddr);
1637 if (error != 0)
1638 return (error);
1639 } else
1640 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1641
1642 iflr->prefixlen =
1643 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1644
1645 iflr->flags = ia->ia6_flags; /* XXX */
1646
1647 return 0;
1648 } else {
1649 struct in6_aliasreq ifra;
1650
1651 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1652 bzero(&ifra, sizeof(ifra));
1653 bcopy(iflr->iflr_name, ifra.ifra_name,
1654 sizeof(ifra.ifra_name));
1655
1656 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1657 ia->ia_addr.sin6_len);
1658 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1659 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1660 ia->ia_dstaddr.sin6_len);
1661 } else {
1662 bzero(&ifra.ifra_dstaddr,
1663 sizeof(ifra.ifra_dstaddr));
1664 }
1665 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1666 ia->ia_prefixmask.sin6_len);
1667
1668 ifra.ifra_flags = ia->ia6_flags;
1669 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1670 ifp, td);
1671 }
1672 }
1673 }
1674
1675 return EOPNOTSUPP; /* just for safety */
1676 }
1677
1678 /*
1679 * Initialize an interface's intetnet6 address
1680 * and routing table entry.
1681 */
1682 static int
1683 in6_ifinit(ifp, ia, sin6, newhost)
1684 struct ifnet *ifp;
1685 struct in6_ifaddr *ia;
1686 struct sockaddr_in6 *sin6;
1687 int newhost;
1688 {
1689 int error = 0, plen, ifacount = 0;
1690 int s = splimp();
1691 struct ifaddr *ifa;
1692
1693 /*
1694 * Give the interface a chance to initialize
1695 * if this is its first address,
1696 * and to validate the address if necessary.
1697 */
1698 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1699 if (ifa->ifa_addr == NULL)
1700 continue; /* just for safety */
1701 if (ifa->ifa_addr->sa_family != AF_INET6)
1702 continue;
1703 ifacount++;
1704 }
1705
1706 ia->ia_addr = *sin6;
1707
1708 if (ifacount <= 1 && ifp->if_ioctl) {
1709 IFF_LOCKGIANT(ifp);
1710 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1711 IFF_UNLOCKGIANT(ifp);
1712 if (error) {
1713 splx(s);
1714 return (error);
1715 }
1716 }
1717 splx(s);
1718
1719 ia->ia_ifa.ifa_metric = ifp->if_metric;
1720
1721 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1722
1723 if (newhost && nd6_need_cache(ifp) != 0) {
1724 /* set the rtrequest function to create llinfo */
1725 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1726 }
1727
1728 /*
1729 * Special case:
1730 * If a new destination address is specified for a point-to-point
1731 * interface, install a route to the destination as an interface
1732 * direct route. In addition, if the link is expected to have neighbor
1733 * cache entries, specify RTF_LLINFO so that a cache entry for the
1734 * destination address will be created.
1735 * created
1736 * XXX: the logic below rejects assigning multiple addresses on a p2p
1737 * interface that share the same destination.
1738 */
1739 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1740 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1741 ia->ia_dstaddr.sin6_family == AF_INET6) {
1742 int rtflags = RTF_UP | RTF_HOST;
1743 struct rtentry *rt = NULL, **rtp = NULL;
1744
1745 if (nd6_need_cache(ifp) != 0) {
1746 rtflags |= RTF_LLINFO;
1747 rtp = &rt;
1748 }
1749
1750 error = rtrequest(RTM_ADD, (struct sockaddr *)&ia->ia_dstaddr,
1751 (struct sockaddr *)&ia->ia_addr,
1752 (struct sockaddr *)&ia->ia_prefixmask,
1753 ia->ia_flags | rtflags, rtp);
1754 if (error != 0)
1755 return (error);
1756 if (rt != NULL) {
1757 struct llinfo_nd6 *ln;
1758
1759 RT_LOCK(rt);
1760 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1761 if (ln != NULL) {
1762 /*
1763 * Set the state to STALE because we don't
1764 * have to perform address resolution on this
1765 * link.
1766 */
1767 ln->ln_state = ND6_LLINFO_STALE;
1768 }
1769 RT_REMREF(rt);
1770 RT_UNLOCK(rt);
1771 }
1772 ia->ia_flags |= IFA_ROUTE;
1773 }
1774 if (plen < 128) {
1775 /*
1776 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1777 */
1778 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1779 }
1780
1781 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1782 if (newhost)
1783 in6_ifaddloop(&(ia->ia_ifa));
1784
1785 return (error);
1786 }
1787
1788 struct in6_multi_mship *
1789 in6_joingroup(ifp, addr, errorp, delay)
1790 struct ifnet *ifp;
1791 struct in6_addr *addr;
1792 int *errorp;
1793 int delay;
1794 {
1795 struct in6_multi_mship *imm;
1796
1797 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
1798 if (!imm) {
1799 *errorp = ENOBUFS;
1800 return NULL;
1801 }
1802 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, delay);
1803 if (!imm->i6mm_maddr) {
1804 /* *errorp is alrady set */
1805 free(imm, M_IP6MADDR);
1806 return NULL;
1807 }
1808 return imm;
1809 }
1810
1811 int
1812 in6_leavegroup(imm)
1813 struct in6_multi_mship *imm;
1814 {
1815
1816 if (imm->i6mm_maddr)
1817 in6_delmulti(imm->i6mm_maddr);
1818 free(imm, M_IP6MADDR);
1819 return 0;
1820 }
1821
1822 /*
1823 * Find an IPv6 interface link-local address specific to an interface.
1824 */
1825 struct in6_ifaddr *
1826 in6ifa_ifpforlinklocal(ifp, ignoreflags)
1827 struct ifnet *ifp;
1828 int ignoreflags;
1829 {
1830 struct ifaddr *ifa;
1831
1832 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1833 if (ifa->ifa_addr == NULL)
1834 continue; /* just for safety */
1835 if (ifa->ifa_addr->sa_family != AF_INET6)
1836 continue;
1837 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1838 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1839 ignoreflags) != 0)
1840 continue;
1841 break;
1842 }
1843 }
1844
1845 return ((struct in6_ifaddr *)ifa);
1846 }
1847
1848
1849 /*
1850 * find the internet address corresponding to a given interface and address.
1851 */
1852 struct in6_ifaddr *
1853 in6ifa_ifpwithaddr(ifp, addr)
1854 struct ifnet *ifp;
1855 struct in6_addr *addr;
1856 {
1857 struct ifaddr *ifa;
1858
1859 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1860 if (ifa->ifa_addr == NULL)
1861 continue; /* just for safety */
1862 if (ifa->ifa_addr->sa_family != AF_INET6)
1863 continue;
1864 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1865 break;
1866 }
1867
1868 return ((struct in6_ifaddr *)ifa);
1869 }
1870
1871 /*
1872 * Convert IP6 address to printable (loggable) representation.
1873 */
1874 static char digits[] = "0123456789abcdef";
1875 static int ip6round = 0;
1876 char *
1877 ip6_sprintf(addr)
1878 const struct in6_addr *addr;
1879 {
1880 static char ip6buf[8][48];
1881 int i;
1882 char *cp;
1883 const u_int16_t *a = (const u_int16_t *)addr;
1884 const u_int8_t *d;
1885 int dcolon = 0;
1886
1887 ip6round = (ip6round + 1) & 7;
1888 cp = ip6buf[ip6round];
1889
1890 for (i = 0; i < 8; i++) {
1891 if (dcolon == 1) {
1892 if (*a == 0) {
1893 if (i == 7)
1894 *cp++ = ':';
1895 a++;
1896 continue;
1897 } else
1898 dcolon = 2;
1899 }
1900 if (*a == 0) {
1901 if (dcolon == 0 && *(a + 1) == 0) {
1902 if (i == 0)
1903 *cp++ = ':';
1904 *cp++ = ':';
1905 dcolon = 1;
1906 } else {
1907 *cp++ = '';
1908 *cp++ = ':';
1909 }
1910 a++;
1911 continue;
1912 }
1913 d = (const u_char *)a;
1914 *cp++ = digits[*d >> 4];
1915 *cp++ = digits[*d++ & 0xf];
1916 *cp++ = digits[*d >> 4];
1917 *cp++ = digits[*d & 0xf];
1918 *cp++ = ':';
1919 a++;
1920 }
1921 *--cp = 0;
1922 return (ip6buf[ip6round]);
1923 }
1924
1925 int
1926 in6_localaddr(in6)
1927 struct in6_addr *in6;
1928 {
1929 struct in6_ifaddr *ia;
1930
1931 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1932 return 1;
1933
1934 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1935 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1936 &ia->ia_prefixmask.sin6_addr)) {
1937 return 1;
1938 }
1939 }
1940
1941 return (0);
1942 }
1943
1944 int
1945 in6_is_addr_deprecated(sa6)
1946 struct sockaddr_in6 *sa6;
1947 {
1948 struct in6_ifaddr *ia;
1949
1950 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1951 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1952 &sa6->sin6_addr) &&
1953 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1954 return (1); /* true */
1955
1956 /* XXX: do we still have to go thru the rest of the list? */
1957 }
1958
1959 return (0); /* false */
1960 }
1961
1962 /*
1963 * return length of part which dst and src are equal
1964 * hard coding...
1965 */
1966 int
1967 in6_matchlen(src, dst)
1968 struct in6_addr *src, *dst;
1969 {
1970 int match = 0;
1971 u_char *s = (u_char *)src, *d = (u_char *)dst;
1972 u_char *lim = s + 16, r;
1973
1974 while (s < lim)
1975 if ((r = (*d++ ^ *s++)) != 0) {
1976 while (r < 128) {
1977 match++;
1978 r <<= 1;
1979 }
1980 break;
1981 } else
1982 match += 8;
1983 return match;
1984 }
1985
1986 /* XXX: to be scope conscious */
1987 int
1988 in6_are_prefix_equal(p1, p2, len)
1989 struct in6_addr *p1, *p2;
1990 int len;
1991 {
1992 int bytelen, bitlen;
1993
1994 /* sanity check */
1995 if (0 > len || len > 128) {
1996 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1997 len);
1998 return (0);
1999 }
2000
2001 bytelen = len / 8;
2002 bitlen = len % 8;
2003
2004 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2005 return (0);
2006 if (bitlen != 0 &&
2007 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2008 p2->s6_addr[bytelen] >> (8 - bitlen))
2009 return (0);
2010
2011 return (1);
2012 }
2013
2014 void
2015 in6_prefixlen2mask(maskp, len)
2016 struct in6_addr *maskp;
2017 int len;
2018 {
2019 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2020 int bytelen, bitlen, i;
2021
2022 /* sanity check */
2023 if (0 > len || len > 128) {
2024 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2025 len);
2026 return;
2027 }
2028
2029 bzero(maskp, sizeof(*maskp));
2030 bytelen = len / 8;
2031 bitlen = len % 8;
2032 for (i = 0; i < bytelen; i++)
2033 maskp->s6_addr[i] = 0xff;
2034 if (bitlen)
2035 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2036 }
2037
2038 /*
2039 * return the best address out of the same scope. if no address was
2040 * found, return the first valid address from designated IF.
2041 */
2042 struct in6_ifaddr *
2043 in6_ifawithifp(ifp, dst)
2044 struct ifnet *ifp;
2045 struct in6_addr *dst;
2046 {
2047 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2048 struct ifaddr *ifa;
2049 struct in6_ifaddr *besta = 0;
2050 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2051
2052 dep[0] = dep[1] = NULL;
2053
2054 /*
2055 * We first look for addresses in the same scope.
2056 * If there is one, return it.
2057 * If two or more, return one which matches the dst longest.
2058 * If none, return one of global addresses assigned other ifs.
2059 */
2060 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2061 if (ifa->ifa_addr->sa_family != AF_INET6)
2062 continue;
2063 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2064 continue; /* XXX: is there any case to allow anycast? */
2065 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2066 continue; /* don't use this interface */
2067 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2068 continue;
2069 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2070 if (ip6_use_deprecated)
2071 dep[0] = (struct in6_ifaddr *)ifa;
2072 continue;
2073 }
2074
2075 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2076 /*
2077 * call in6_matchlen() as few as possible
2078 */
2079 if (besta) {
2080 if (blen == -1)
2081 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2082 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2083 if (tlen > blen) {
2084 blen = tlen;
2085 besta = (struct in6_ifaddr *)ifa;
2086 }
2087 } else
2088 besta = (struct in6_ifaddr *)ifa;
2089 }
2090 }
2091 if (besta)
2092 return (besta);
2093
2094 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2095 if (ifa->ifa_addr->sa_family != AF_INET6)
2096 continue;
2097 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2098 continue; /* XXX: is there any case to allow anycast? */
2099 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2100 continue; /* don't use this interface */
2101 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2102 continue;
2103 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2104 if (ip6_use_deprecated)
2105 dep[1] = (struct in6_ifaddr *)ifa;
2106 continue;
2107 }
2108
2109 return (struct in6_ifaddr *)ifa;
2110 }
2111
2112 /* use the last-resort values, that are, deprecated addresses */
2113 if (dep[0])
2114 return dep[0];
2115 if (dep[1])
2116 return dep[1];
2117
2118 return NULL;
2119 }
2120
2121 /*
2122 * perform DAD when interface becomes IFF_UP.
2123 */
2124 void
2125 in6_if_up(ifp)
2126 struct ifnet *ifp;
2127 {
2128 struct ifaddr *ifa;
2129 struct in6_ifaddr *ia;
2130
2131 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2132 if (ifa->ifa_addr->sa_family != AF_INET6)
2133 continue;
2134 ia = (struct in6_ifaddr *)ifa;
2135 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2136 /*
2137 * The TENTATIVE flag was likely set by hand
2138 * beforehand, implicitly indicating the need for DAD.
2139 * We may be able to skip the random delay in this
2140 * case, but we impose delays just in case.
2141 */
2142 nd6_dad_start(ifa,
2143 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2144 }
2145 }
2146
2147 /*
2148 * special cases, like 6to4, are handled in in6_ifattach
2149 */
2150 in6_ifattach(ifp, NULL);
2151 }
2152
2153 int
2154 in6if_do_dad(ifp)
2155 struct ifnet *ifp;
2156 {
2157 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2158 return (0);
2159
2160 switch (ifp->if_type) {
2161 #ifdef IFT_DUMMY
2162 case IFT_DUMMY:
2163 #endif
2164 case IFT_FAITH:
2165 /*
2166 * These interfaces do not have the IFF_LOOPBACK flag,
2167 * but loop packets back. We do not have to do DAD on such
2168 * interfaces. We should even omit it, because loop-backed
2169 * NS would confuse the DAD procedure.
2170 */
2171 return (0);
2172 default:
2173 /*
2174 * Our DAD routine requires the interface up and running.
2175 * However, some interfaces can be up before the RUNNING
2176 * status. Additionaly, users may try to assign addresses
2177 * before the interface becomes up (or running).
2178 * We simply skip DAD in such a case as a work around.
2179 * XXX: we should rather mark "tentative" on such addresses,
2180 * and do DAD after the interface becomes ready.
2181 */
2182 if (!((ifp->if_flags & IFF_UP) &&
2183 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2184 return (0);
2185
2186 return (1);
2187 }
2188 }
2189
2190 /*
2191 * Calculate max IPv6 MTU through all the interfaces and store it
2192 * to in6_maxmtu.
2193 */
2194 void
2195 in6_setmaxmtu()
2196 {
2197 unsigned long maxmtu = 0;
2198 struct ifnet *ifp;
2199
2200 IFNET_RLOCK();
2201 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
2202 /* this function can be called during ifnet initialization */
2203 if (!ifp->if_afdata[AF_INET6])
2204 continue;
2205 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2206 IN6_LINKMTU(ifp) > maxmtu)
2207 maxmtu = IN6_LINKMTU(ifp);
2208 }
2209 IFNET_RUNLOCK();
2210 if (maxmtu) /* update only when maxmtu is positive */
2211 in6_maxmtu = maxmtu;
2212 }
2213
2214 /*
2215 * Provide the length of interface identifiers to be used for the link attached
2216 * to the given interface. The length should be defined in "IPv6 over
2217 * xxx-link" document. Note that address architecture might also define
2218 * the length for a particular set of address prefixes, regardless of the
2219 * link type. As clarified in rfc2462bis, those two definitions should be
2220 * consistent, and those really are as of August 2004.
2221 */
2222 int
2223 in6_if2idlen(ifp)
2224 struct ifnet *ifp;
2225 {
2226 switch (ifp->if_type) {
2227 case IFT_ETHER: /* RFC2464 */
2228 #ifdef IFT_PROPVIRTUAL
2229 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2230 #endif
2231 #ifdef IFT_L2VLAN
2232 case IFT_L2VLAN: /* ditto */
2233 #endif
2234 #ifdef IFT_IEEE80211
2235 case IFT_IEEE80211: /* ditto */
2236 #endif
2237 #ifdef IFT_MIP
2238 case IFT_MIP: /* ditto */
2239 #endif
2240 return (64);
2241 case IFT_FDDI: /* RFC2467 */
2242 return (64);
2243 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2244 return (64);
2245 case IFT_PPP: /* RFC2472 */
2246 return (64);
2247 case IFT_ARCNET: /* RFC2497 */
2248 return (64);
2249 case IFT_FRELAY: /* RFC2590 */
2250 return (64);
2251 case IFT_IEEE1394: /* RFC3146 */
2252 return (64);
2253 case IFT_GIF:
2254 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2255 case IFT_LOOP:
2256 return (64); /* XXX: is this really correct? */
2257 default:
2258 /*
2259 * Unknown link type:
2260 * It might be controversial to use the today's common constant
2261 * of 64 for these cases unconditionally. For full compliance,
2262 * we should return an error in this case. On the other hand,
2263 * if we simply miss the standard for the link type or a new
2264 * standard is defined for a new link type, the IFID length
2265 * is very likely to be the common constant. As a compromise,
2266 * we always use the constant, but make an explicit notice
2267 * indicating the "unknown" case.
2268 */
2269 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2270 return (64);
2271 }
2272 }
2273
2274 void *
2275 in6_domifattach(ifp)
2276 struct ifnet *ifp;
2277 {
2278 struct in6_ifextra *ext;
2279
2280 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2281 bzero(ext, sizeof(*ext));
2282
2283 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2284 M_IFADDR, M_WAITOK);
2285 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2286
2287 ext->icmp6_ifstat =
2288 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2289 M_IFADDR, M_WAITOK);
2290 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2291
2292 ext->nd_ifinfo = nd6_ifattach(ifp);
2293 ext->scope6_id = scope6_ifattach(ifp);
2294 return ext;
2295 }
2296
2297 void
2298 in6_domifdetach(ifp, aux)
2299 struct ifnet *ifp;
2300 void *aux;
2301 {
2302 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2303
2304 scope6_ifdetach(ext->scope6_id);
2305 nd6_ifdetach(ext->nd_ifinfo);
2306 free(ext->in6_ifstat, M_IFADDR);
2307 free(ext->icmp6_ifstat, M_IFADDR);
2308 free(ext, M_IFADDR);
2309 }
2310
2311 /*
2312 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2313 * v4 mapped addr or v4 compat addr
2314 */
2315 void
2316 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2317 {
2318 bzero(sin, sizeof(*sin));
2319 sin->sin_len = sizeof(struct sockaddr_in);
2320 sin->sin_family = AF_INET;
2321 sin->sin_port = sin6->sin6_port;
2322 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2323 }
2324
2325 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2326 void
2327 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2328 {
2329 bzero(sin6, sizeof(*sin6));
2330 sin6->sin6_len = sizeof(struct sockaddr_in6);
2331 sin6->sin6_family = AF_INET6;
2332 sin6->sin6_port = sin->sin_port;
2333 sin6->sin6_addr.s6_addr32[0] = 0;
2334 sin6->sin6_addr.s6_addr32[1] = 0;
2335 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2336 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2337 }
2338
2339 /* Convert sockaddr_in6 into sockaddr_in. */
2340 void
2341 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2342 {
2343 struct sockaddr_in *sin_p;
2344 struct sockaddr_in6 sin6;
2345
2346 /*
2347 * Save original sockaddr_in6 addr and convert it
2348 * to sockaddr_in.
2349 */
2350 sin6 = *(struct sockaddr_in6 *)nam;
2351 sin_p = (struct sockaddr_in *)nam;
2352 in6_sin6_2_sin(sin_p, &sin6);
2353 }
2354
2355 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2356 void
2357 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2358 {
2359 struct sockaddr_in *sin_p;
2360 struct sockaddr_in6 *sin6_p;
2361
2362 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
2363 M_WAITOK);
2364 sin_p = (struct sockaddr_in *)*nam;
2365 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2366 FREE(*nam, M_SONAME);
2367 *nam = (struct sockaddr *)sin6_p;
2368 }
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