FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /* $FreeBSD: releng/6.3/sys/netinet6/in6.c 193893 2009-06-10 10:31:11Z 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 case SIOCSIFINFO_IN6:
361 if (!privileged)
362 return (EPERM);
363 /* FALLTHROUGH */
364 case OSIOCGIFINFO_IN6:
365 case SIOCGIFINFO_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 LIST_INIT(&ia->ia6_memberships);
905 /* Initialize the address and masks, and put time stamp */
906 IFA_LOCK_INIT(&ia->ia_ifa);
907 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
908 ia->ia_addr.sin6_family = AF_INET6;
909 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
910 ia->ia6_createtime = time_second;
911 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
912 /*
913 * XXX: some functions expect that ifa_dstaddr is not
914 * NULL for p2p interfaces.
915 */
916 ia->ia_ifa.ifa_dstaddr =
917 (struct sockaddr *)&ia->ia_dstaddr;
918 } else {
919 ia->ia_ifa.ifa_dstaddr = NULL;
920 }
921 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
922
923 ia->ia_ifp = ifp;
924 if ((oia = in6_ifaddr) != NULL) {
925 for ( ; oia->ia_next; oia = oia->ia_next)
926 continue;
927 oia->ia_next = ia;
928 } else
929 in6_ifaddr = ia;
930
931 ia->ia_ifa.ifa_refcnt = 1;
932 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
933 }
934
935 /* update timestamp */
936 ia->ia6_updatetime = time_second;
937
938 /* set prefix mask */
939 if (ifra->ifra_prefixmask.sin6_len) {
940 /*
941 * We prohibit changing the prefix length of an existing
942 * address, because
943 * + such an operation should be rare in IPv6, and
944 * + the operation would confuse prefix management.
945 */
946 if (ia->ia_prefixmask.sin6_len &&
947 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
948 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
949 " existing (%s) address should not be changed\n",
950 ip6_sprintf(&ia->ia_addr.sin6_addr)));
951 error = EINVAL;
952 goto unlink;
953 }
954 ia->ia_prefixmask = ifra->ifra_prefixmask;
955 }
956
957 /*
958 * If a new destination address is specified, scrub the old one and
959 * install the new destination. Note that the interface must be
960 * p2p or loopback (see the check above.)
961 */
962 if (dst6.sin6_family == AF_INET6 &&
963 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
964 int e;
965
966 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
967 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
968 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
969 "a route to the old destination: %s\n",
970 ip6_sprintf(&ia->ia_addr.sin6_addr)));
971 /* proceed anyway... */
972 } else
973 ia->ia_flags &= ~IFA_ROUTE;
974 ia->ia_dstaddr = dst6;
975 }
976
977 /*
978 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
979 * to see if the address is deprecated or invalidated, but initialize
980 * these members for applications.
981 */
982 ia->ia6_lifetime = ifra->ifra_lifetime;
983 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
984 ia->ia6_lifetime.ia6t_expire =
985 time_second + ia->ia6_lifetime.ia6t_vltime;
986 } else
987 ia->ia6_lifetime.ia6t_expire = 0;
988 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
989 ia->ia6_lifetime.ia6t_preferred =
990 time_second + ia->ia6_lifetime.ia6t_pltime;
991 } else
992 ia->ia6_lifetime.ia6t_preferred = 0;
993
994 /* reset the interface and routing table appropriately. */
995 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
996 goto unlink;
997
998 /*
999 * configure address flags.
1000 */
1001 ia->ia6_flags = ifra->ifra_flags;
1002 /*
1003 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1004 * userland, make it deprecated.
1005 */
1006 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1007 ia->ia6_lifetime.ia6t_pltime = 0;
1008 ia->ia6_lifetime.ia6t_preferred = time_second;
1009 }
1010 /*
1011 * Make the address tentative before joining multicast addresses,
1012 * so that corresponding MLD responses would not have a tentative
1013 * source address.
1014 */
1015 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1016 if (hostIsNew && in6if_do_dad(ifp))
1017 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1018
1019 /*
1020 * We are done if we have simply modified an existing address.
1021 */
1022 if (!hostIsNew)
1023 return (error);
1024
1025 /*
1026 * Beyond this point, we should call in6_purgeaddr upon an error,
1027 * not just go to unlink.
1028 */
1029
1030 /* Join necessary multicast groups */
1031 in6m_sol = NULL;
1032 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1033 struct sockaddr_in6 mltaddr, mltmask;
1034 struct in6_addr llsol;
1035
1036 /* join solicited multicast addr for new host id */
1037 bzero(&llsol, sizeof(struct in6_addr));
1038 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
1039 llsol.s6_addr32[1] = 0;
1040 llsol.s6_addr32[2] = htonl(1);
1041 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
1042 llsol.s6_addr8[12] = 0xff;
1043 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
1044 /* XXX: should not happen */
1045 log(LOG_ERR, "in6_update_ifa: "
1046 "in6_setscope failed\n");
1047 goto cleanup;
1048 }
1049 delay = 0;
1050 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1051 /*
1052 * We need a random delay for DAD on the address
1053 * being configured. It also means delaying
1054 * transmission of the corresponding MLD report to
1055 * avoid report collision.
1056 * [draft-ietf-ipv6-rfc2462bis-02.txt]
1057 */
1058 delay = arc4random() %
1059 (MAX_RTR_SOLICITATION_DELAY * hz);
1060 }
1061 imm = in6_joingroup(ifp, &llsol, &error, delay);
1062 if (imm == NULL) {
1063 nd6log((LOG_WARNING,
1064 "in6_update_ifa: addmulti failed for "
1065 "%s on %s (errno=%d)\n",
1066 ip6_sprintf(&llsol), if_name(ifp),
1067 error));
1068 in6_purgeaddr((struct ifaddr *)ia);
1069 return (error);
1070 }
1071 LIST_INSERT_HEAD(&ia->ia6_memberships,
1072 imm, i6mm_chain);
1073 in6m_sol = imm->i6mm_maddr;
1074
1075 bzero(&mltmask, sizeof(mltmask));
1076 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1077 mltmask.sin6_family = AF_INET6;
1078 mltmask.sin6_addr = in6mask32;
1079 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
1080
1081 /*
1082 * join link-local all-nodes address
1083 */
1084 bzero(&mltaddr, sizeof(mltaddr));
1085 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1086 mltaddr.sin6_family = AF_INET6;
1087 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1088 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1089 0)
1090 goto cleanup; /* XXX: should not fail */
1091
1092 /*
1093 * XXX: do we really need this automatic routes?
1094 * We should probably reconsider this stuff. Most applications
1095 * actually do not need the routes, since they usually specify
1096 * the outgoing interface.
1097 */
1098 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1099 if (rt) {
1100 if (memcmp(&mltaddr.sin6_addr,
1101 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1102 MLTMASK_LEN)) {
1103 RTFREE_LOCKED(rt);
1104 rt = NULL;
1105 }
1106 }
1107 if (!rt) {
1108 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
1109 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1110 (struct sockaddr *)&ia->ia_addr,
1111 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1112 (struct rtentry **)0);
1113 if (error)
1114 goto cleanup;
1115 } else
1116 RTFREE_LOCKED(rt);
1117
1118 /*
1119 * XXX: do we really need this automatic routes?
1120 * We should probably reconsider this stuff. Most applications
1121 * actually do not need the routes, since they usually specify
1122 * the outgoing interface.
1123 */
1124 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1125 if (rt) {
1126 /* XXX: only works in !SCOPEDROUTING case. */
1127 if (memcmp(&mltaddr.sin6_addr,
1128 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1129 MLTMASK_LEN)) {
1130 RTFREE_LOCKED(rt);
1131 rt = NULL;
1132 }
1133 }
1134 if (!rt) {
1135 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1136 (struct sockaddr *)&ia->ia_addr,
1137 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1138 (struct rtentry **)0);
1139 if (error)
1140 goto cleanup;
1141 } else {
1142 RTFREE_LOCKED(rt);
1143 }
1144
1145 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1146 if (!imm) {
1147 nd6log((LOG_WARNING,
1148 "in6_update_ifa: addmulti failed for "
1149 "%s on %s (errno=%d)\n",
1150 ip6_sprintf(&mltaddr.sin6_addr),
1151 if_name(ifp), error));
1152 goto cleanup;
1153 }
1154 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1155
1156 /*
1157 * join node information group address
1158 */
1159 #define hostnamelen strlen(hostname)
1160 delay = 0;
1161 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1162 /*
1163 * The spec doesn't say anything about delay for this
1164 * group, but the same logic should apply.
1165 */
1166 delay = arc4random() %
1167 (MAX_RTR_SOLICITATION_DELAY * hz);
1168 }
1169 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1170 == 0) {
1171 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
1172 delay); /* XXX jinmei */
1173 if (!imm) {
1174 nd6log((LOG_WARNING, "in6_update_ifa: "
1175 "addmulti failed for %s on %s "
1176 "(errno=%d)\n",
1177 ip6_sprintf(&mltaddr.sin6_addr),
1178 if_name(ifp), error));
1179 /* XXX not very fatal, go on... */
1180 } else {
1181 LIST_INSERT_HEAD(&ia->ia6_memberships,
1182 imm, i6mm_chain);
1183 }
1184 }
1185 #undef hostnamelen
1186
1187 /*
1188 * join interface-local all-nodes address.
1189 * (ff01::1%ifN, and ff01::%ifN/32)
1190 */
1191 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1192 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
1193 != 0)
1194 goto cleanup; /* XXX: should not fail */
1195 /* XXX: again, do we really need the route? */
1196 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1197 if (rt) {
1198 if (memcmp(&mltaddr.sin6_addr,
1199 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1200 MLTMASK_LEN)) {
1201 RTFREE_LOCKED(rt);
1202 rt = NULL;
1203 }
1204 }
1205 if (!rt) {
1206 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1207 (struct sockaddr *)&ia->ia_addr,
1208 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1209 (struct rtentry **)0);
1210 if (error)
1211 goto cleanup;
1212 } else
1213 RTFREE_LOCKED(rt);
1214
1215 /* XXX: again, do we really need the route? */
1216 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1217 if (rt) {
1218 if (memcmp(&mltaddr.sin6_addr,
1219 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1220 MLTMASK_LEN)) {
1221 RTFREE_LOCKED(rt);
1222 rt = NULL;
1223 }
1224 }
1225 if (!rt) {
1226 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1227 (struct sockaddr *)&ia->ia_addr,
1228 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1229 (struct rtentry **)0);
1230 if (error)
1231 goto cleanup;
1232 } else {
1233 RTFREE_LOCKED(rt);
1234 }
1235
1236 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1237 if (!imm) {
1238 nd6log((LOG_WARNING, "in6_update_ifa: "
1239 "addmulti failed for %s on %s "
1240 "(errno=%d)\n",
1241 ip6_sprintf(&mltaddr.sin6_addr),
1242 if_name(ifp), error));
1243 goto cleanup;
1244 }
1245 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1246 #undef MLTMASK_LEN
1247 }
1248
1249 /*
1250 * Perform DAD, if needed.
1251 * XXX It may be of use, if we can administratively
1252 * disable DAD.
1253 */
1254 if (hostIsNew && in6if_do_dad(ifp) &&
1255 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1256 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1257 {
1258 int mindelay, maxdelay;
1259
1260 delay = 0;
1261 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1262 /*
1263 * We need to impose a delay before sending an NS
1264 * for DAD. Check if we also needed a delay for the
1265 * corresponding MLD message. If we did, the delay
1266 * should be larger than the MLD delay (this could be
1267 * relaxed a bit, but this simple logic is at least
1268 * safe).
1269 */
1270 mindelay = 0;
1271 if (in6m_sol != NULL &&
1272 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1273 mindelay = in6m_sol->in6m_timer;
1274 }
1275 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1276 if (maxdelay - mindelay == 0)
1277 delay = 0;
1278 else {
1279 delay =
1280 (arc4random() % (maxdelay - mindelay)) +
1281 mindelay;
1282 }
1283 }
1284 nd6_dad_start((struct ifaddr *)ia, delay);
1285 }
1286
1287 return (error);
1288
1289 unlink:
1290 /*
1291 * XXX: if a change of an existing address failed, keep the entry
1292 * anyway.
1293 */
1294 if (hostIsNew)
1295 in6_unlink_ifa(ia, ifp);
1296 return (error);
1297
1298 cleanup:
1299 in6_purgeaddr(&ia->ia_ifa);
1300 return error;
1301 }
1302
1303 void
1304 in6_purgeaddr(ifa)
1305 struct ifaddr *ifa;
1306 {
1307 struct ifnet *ifp = ifa->ifa_ifp;
1308 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1309 struct in6_multi_mship *imm;
1310
1311 /* stop DAD processing */
1312 nd6_dad_stop(ifa);
1313
1314 /*
1315 * delete route to the destination of the address being purged.
1316 * The interface must be p2p or loopback in this case.
1317 */
1318 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1319 int e;
1320
1321 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1322 != 0) {
1323 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1324 "a route to the p2p destination: %s on %s, "
1325 "errno=%d\n",
1326 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1327 e);
1328 /* proceed anyway... */
1329 } else
1330 ia->ia_flags &= ~IFA_ROUTE;
1331 }
1332
1333 /* Remove ownaddr's loopback rtentry, if it exists. */
1334 in6_ifremloop(&(ia->ia_ifa));
1335
1336 /*
1337 * leave from multicast groups we have joined for the interface
1338 */
1339 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1340 LIST_REMOVE(imm, i6mm_chain);
1341 in6_leavegroup(imm);
1342 }
1343
1344 in6_unlink_ifa(ia, ifp);
1345 }
1346
1347 static void
1348 in6_unlink_ifa(ia, ifp)
1349 struct in6_ifaddr *ia;
1350 struct ifnet *ifp;
1351 {
1352 struct in6_ifaddr *oia;
1353 int s = splnet();
1354
1355 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1356
1357 oia = ia;
1358 if (oia == (ia = in6_ifaddr))
1359 in6_ifaddr = ia->ia_next;
1360 else {
1361 while (ia->ia_next && (ia->ia_next != oia))
1362 ia = ia->ia_next;
1363 if (ia->ia_next)
1364 ia->ia_next = oia->ia_next;
1365 else {
1366 /* search failed */
1367 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1368 }
1369 }
1370
1371 /*
1372 * Release the reference to the base prefix. There should be a
1373 * positive reference.
1374 */
1375 if (oia->ia6_ndpr == NULL) {
1376 nd6log((LOG_NOTICE,
1377 "in6_unlink_ifa: autoconf'ed address "
1378 "%p has no prefix\n", oia));
1379 } else {
1380 oia->ia6_ndpr->ndpr_refcnt--;
1381 oia->ia6_ndpr = NULL;
1382 }
1383
1384 /*
1385 * Also, if the address being removed is autoconf'ed, call
1386 * pfxlist_onlink_check() since the release might affect the status of
1387 * other (detached) addresses.
1388 */
1389 if ((oia->ia6_flags & IN6_IFF_AUTOCONF)) {
1390 pfxlist_onlink_check();
1391 }
1392
1393 /*
1394 * release another refcnt for the link from in6_ifaddr.
1395 * Note that we should decrement the refcnt at least once for all *BSD.
1396 */
1397 IFAFREE(&oia->ia_ifa);
1398
1399 splx(s);
1400 }
1401
1402 void
1403 in6_purgeif(ifp)
1404 struct ifnet *ifp;
1405 {
1406 struct ifaddr *ifa, *nifa;
1407
1408 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
1409 nifa = TAILQ_NEXT(ifa, ifa_list);
1410 if (ifa->ifa_addr->sa_family != AF_INET6)
1411 continue;
1412 in6_purgeaddr(ifa);
1413 }
1414
1415 in6_ifdetach(ifp);
1416 }
1417
1418 /*
1419 * SIOC[GAD]LIFADDR.
1420 * SIOCGLIFADDR: get first address. (?)
1421 * SIOCGLIFADDR with IFLR_PREFIX:
1422 * get first address that matches the specified prefix.
1423 * SIOCALIFADDR: add the specified address.
1424 * SIOCALIFADDR with IFLR_PREFIX:
1425 * add the specified prefix, filling hostid part from
1426 * the first link-local address. prefixlen must be <= 64.
1427 * SIOCDLIFADDR: delete the specified address.
1428 * SIOCDLIFADDR with IFLR_PREFIX:
1429 * delete the first address that matches the specified prefix.
1430 * return values:
1431 * EINVAL on invalid parameters
1432 * EADDRNOTAVAIL on prefix match failed/specified address not found
1433 * other values may be returned from in6_ioctl()
1434 *
1435 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1436 * this is to accomodate address naming scheme other than RFC2374,
1437 * in the future.
1438 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1439 * address encoding scheme. (see figure on page 8)
1440 */
1441 static int
1442 in6_lifaddr_ioctl(so, cmd, data, ifp, td)
1443 struct socket *so;
1444 u_long cmd;
1445 caddr_t data;
1446 struct ifnet *ifp;
1447 struct thread *td;
1448 {
1449 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1450 struct ifaddr *ifa;
1451 struct sockaddr *sa;
1452
1453 /* sanity checks */
1454 if (!data || !ifp) {
1455 panic("invalid argument to in6_lifaddr_ioctl");
1456 /* NOTREACHED */
1457 }
1458
1459 switch (cmd) {
1460 case SIOCGLIFADDR:
1461 /* address must be specified on GET with IFLR_PREFIX */
1462 if ((iflr->flags & IFLR_PREFIX) == 0)
1463 break;
1464 /* FALLTHROUGH */
1465 case SIOCALIFADDR:
1466 case SIOCDLIFADDR:
1467 /* address must be specified on ADD and DELETE */
1468 sa = (struct sockaddr *)&iflr->addr;
1469 if (sa->sa_family != AF_INET6)
1470 return EINVAL;
1471 if (sa->sa_len != sizeof(struct sockaddr_in6))
1472 return EINVAL;
1473 /* XXX need improvement */
1474 sa = (struct sockaddr *)&iflr->dstaddr;
1475 if (sa->sa_family && sa->sa_family != AF_INET6)
1476 return EINVAL;
1477 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1478 return EINVAL;
1479 break;
1480 default: /* shouldn't happen */
1481 #if 0
1482 panic("invalid cmd to in6_lifaddr_ioctl");
1483 /* NOTREACHED */
1484 #else
1485 return EOPNOTSUPP;
1486 #endif
1487 }
1488 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1489 return EINVAL;
1490
1491 switch (cmd) {
1492 case SIOCALIFADDR:
1493 {
1494 struct in6_aliasreq ifra;
1495 struct in6_addr *hostid = NULL;
1496 int prefixlen;
1497
1498 if ((iflr->flags & IFLR_PREFIX) != 0) {
1499 struct sockaddr_in6 *sin6;
1500
1501 /*
1502 * hostid is to fill in the hostid part of the
1503 * address. hostid points to the first link-local
1504 * address attached to the interface.
1505 */
1506 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1507 if (!ifa)
1508 return EADDRNOTAVAIL;
1509 hostid = IFA_IN6(ifa);
1510
1511 /* prefixlen must be <= 64. */
1512 if (64 < iflr->prefixlen)
1513 return EINVAL;
1514 prefixlen = iflr->prefixlen;
1515
1516 /* hostid part must be zero. */
1517 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1518 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1519 sin6->sin6_addr.s6_addr32[3] != 0) {
1520 return EINVAL;
1521 }
1522 } else
1523 prefixlen = iflr->prefixlen;
1524
1525 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1526 bzero(&ifra, sizeof(ifra));
1527 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1528
1529 bcopy(&iflr->addr, &ifra.ifra_addr,
1530 ((struct sockaddr *)&iflr->addr)->sa_len);
1531 if (hostid) {
1532 /* fill in hostid part */
1533 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1534 hostid->s6_addr32[2];
1535 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1536 hostid->s6_addr32[3];
1537 }
1538
1539 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1540 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1541 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1542 if (hostid) {
1543 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1544 hostid->s6_addr32[2];
1545 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1546 hostid->s6_addr32[3];
1547 }
1548 }
1549
1550 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1551 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1552
1553 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1554 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1555 }
1556 case SIOCGLIFADDR:
1557 case SIOCDLIFADDR:
1558 {
1559 struct in6_ifaddr *ia;
1560 struct in6_addr mask, candidate, match;
1561 struct sockaddr_in6 *sin6;
1562 int cmp;
1563
1564 bzero(&mask, sizeof(mask));
1565 if (iflr->flags & IFLR_PREFIX) {
1566 /* lookup a prefix rather than address. */
1567 in6_prefixlen2mask(&mask, iflr->prefixlen);
1568
1569 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1570 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1571 match.s6_addr32[0] &= mask.s6_addr32[0];
1572 match.s6_addr32[1] &= mask.s6_addr32[1];
1573 match.s6_addr32[2] &= mask.s6_addr32[2];
1574 match.s6_addr32[3] &= mask.s6_addr32[3];
1575
1576 /* if you set extra bits, that's wrong */
1577 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1578 return EINVAL;
1579
1580 cmp = 1;
1581 } else {
1582 if (cmd == SIOCGLIFADDR) {
1583 /* on getting an address, take the 1st match */
1584 cmp = 0; /* XXX */
1585 } else {
1586 /* on deleting an address, do exact match */
1587 in6_prefixlen2mask(&mask, 128);
1588 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1589 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1590
1591 cmp = 1;
1592 }
1593 }
1594
1595 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1596 if (ifa->ifa_addr->sa_family != AF_INET6)
1597 continue;
1598 if (!cmp)
1599 break;
1600
1601 /*
1602 * XXX: this is adhoc, but is necessary to allow
1603 * a user to specify fe80::/64 (not /10) for a
1604 * link-local address.
1605 */
1606 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1607 in6_clearscope(&candidate);
1608 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1609 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1610 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1611 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1612 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1613 break;
1614 }
1615 if (!ifa)
1616 return EADDRNOTAVAIL;
1617 ia = ifa2ia6(ifa);
1618
1619 if (cmd == SIOCGLIFADDR) {
1620 int error;
1621
1622 /* fill in the if_laddrreq structure */
1623 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1624 error = sa6_recoverscope(
1625 (struct sockaddr_in6 *)&iflr->addr);
1626 if (error != 0)
1627 return (error);
1628
1629 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1630 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1631 ia->ia_dstaddr.sin6_len);
1632 error = sa6_recoverscope(
1633 (struct sockaddr_in6 *)&iflr->dstaddr);
1634 if (error != 0)
1635 return (error);
1636 } else
1637 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1638
1639 iflr->prefixlen =
1640 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1641
1642 iflr->flags = ia->ia6_flags; /* XXX */
1643
1644 return 0;
1645 } else {
1646 struct in6_aliasreq ifra;
1647
1648 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1649 bzero(&ifra, sizeof(ifra));
1650 bcopy(iflr->iflr_name, ifra.ifra_name,
1651 sizeof(ifra.ifra_name));
1652
1653 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1654 ia->ia_addr.sin6_len);
1655 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1656 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1657 ia->ia_dstaddr.sin6_len);
1658 } else {
1659 bzero(&ifra.ifra_dstaddr,
1660 sizeof(ifra.ifra_dstaddr));
1661 }
1662 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1663 ia->ia_prefixmask.sin6_len);
1664
1665 ifra.ifra_flags = ia->ia6_flags;
1666 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1667 ifp, td);
1668 }
1669 }
1670 }
1671
1672 return EOPNOTSUPP; /* just for safety */
1673 }
1674
1675 /*
1676 * Initialize an interface's intetnet6 address
1677 * and routing table entry.
1678 */
1679 static int
1680 in6_ifinit(ifp, ia, sin6, newhost)
1681 struct ifnet *ifp;
1682 struct in6_ifaddr *ia;
1683 struct sockaddr_in6 *sin6;
1684 int newhost;
1685 {
1686 int error = 0, plen, ifacount = 0;
1687 int s = splimp();
1688 struct ifaddr *ifa;
1689
1690 /*
1691 * Give the interface a chance to initialize
1692 * if this is its first address,
1693 * and to validate the address if necessary.
1694 */
1695 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1696 if (ifa->ifa_addr == NULL)
1697 continue; /* just for safety */
1698 if (ifa->ifa_addr->sa_family != AF_INET6)
1699 continue;
1700 ifacount++;
1701 }
1702
1703 ia->ia_addr = *sin6;
1704
1705 if (ifacount <= 1 && ifp->if_ioctl) {
1706 IFF_LOCKGIANT(ifp);
1707 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1708 IFF_UNLOCKGIANT(ifp);
1709 if (error) {
1710 splx(s);
1711 return (error);
1712 }
1713 }
1714 splx(s);
1715
1716 ia->ia_ifa.ifa_metric = ifp->if_metric;
1717
1718 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1719
1720 if (newhost) {
1721 /*
1722 * set the rtrequest function to create llinfo. It also
1723 * adjust outgoing interface of the route for the local
1724 * address when called via in6_ifaddloop() below.
1725 */
1726 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1727 }
1728
1729 /*
1730 * Special case:
1731 * If a new destination address is specified for a point-to-point
1732 * interface, install a route to the destination as an interface
1733 * direct route. In addition, if the link is expected to have neighbor
1734 * cache entries, specify RTF_LLINFO so that a cache entry for the
1735 * destination address will be created.
1736 * created
1737 * XXX: the logic below rejects assigning multiple addresses on a p2p
1738 * interface that share the same destination.
1739 */
1740 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1741 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1742 ia->ia_dstaddr.sin6_family == AF_INET6) {
1743 int rtflags = RTF_UP | RTF_HOST;
1744 struct rtentry *rt = NULL, **rtp = NULL;
1745
1746 if (nd6_need_cache(ifp) != 0) {
1747 rtflags |= RTF_LLINFO;
1748 rtp = &rt;
1749 }
1750
1751 error = rtrequest(RTM_ADD, (struct sockaddr *)&ia->ia_dstaddr,
1752 (struct sockaddr *)&ia->ia_addr,
1753 (struct sockaddr *)&ia->ia_prefixmask,
1754 ia->ia_flags | rtflags, rtp);
1755 if (error != 0)
1756 return (error);
1757 if (rt != NULL) {
1758 struct llinfo_nd6 *ln;
1759
1760 RT_LOCK(rt);
1761 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1762 if (ln != NULL) {
1763 /*
1764 * Set the state to STALE because we don't
1765 * have to perform address resolution on this
1766 * link.
1767 */
1768 ln->ln_state = ND6_LLINFO_STALE;
1769 }
1770 RT_REMREF(rt);
1771 RT_UNLOCK(rt);
1772 }
1773 ia->ia_flags |= IFA_ROUTE;
1774 }
1775 if (plen < 128) {
1776 /*
1777 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1778 */
1779 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1780 }
1781
1782 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1783 if (newhost)
1784 in6_ifaddloop(&(ia->ia_ifa));
1785
1786 return (error);
1787 }
1788
1789 struct in6_multi_mship *
1790 in6_joingroup(ifp, addr, errorp, delay)
1791 struct ifnet *ifp;
1792 struct in6_addr *addr;
1793 int *errorp;
1794 int delay;
1795 {
1796 struct in6_multi_mship *imm;
1797
1798 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
1799 if (!imm) {
1800 *errorp = ENOBUFS;
1801 return NULL;
1802 }
1803 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, delay);
1804 if (!imm->i6mm_maddr) {
1805 /* *errorp is alrady set */
1806 free(imm, M_IP6MADDR);
1807 return NULL;
1808 }
1809 return imm;
1810 }
1811
1812 int
1813 in6_leavegroup(imm)
1814 struct in6_multi_mship *imm;
1815 {
1816
1817 if (imm->i6mm_maddr)
1818 in6_delmulti(imm->i6mm_maddr);
1819 free(imm, M_IP6MADDR);
1820 return 0;
1821 }
1822
1823 /*
1824 * Find an IPv6 interface link-local address specific to an interface.
1825 */
1826 struct in6_ifaddr *
1827 in6ifa_ifpforlinklocal(ifp, ignoreflags)
1828 struct ifnet *ifp;
1829 int ignoreflags;
1830 {
1831 struct ifaddr *ifa;
1832
1833 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1834 if (ifa->ifa_addr == NULL)
1835 continue; /* just for safety */
1836 if (ifa->ifa_addr->sa_family != AF_INET6)
1837 continue;
1838 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1839 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1840 ignoreflags) != 0)
1841 continue;
1842 break;
1843 }
1844 }
1845
1846 return ((struct in6_ifaddr *)ifa);
1847 }
1848
1849
1850 /*
1851 * find the internet address corresponding to a given interface and address.
1852 */
1853 struct in6_ifaddr *
1854 in6ifa_ifpwithaddr(ifp, addr)
1855 struct ifnet *ifp;
1856 struct in6_addr *addr;
1857 {
1858 struct ifaddr *ifa;
1859
1860 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1861 if (ifa->ifa_addr == NULL)
1862 continue; /* just for safety */
1863 if (ifa->ifa_addr->sa_family != AF_INET6)
1864 continue;
1865 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1866 break;
1867 }
1868
1869 return ((struct in6_ifaddr *)ifa);
1870 }
1871
1872 /*
1873 * Convert IP6 address to printable (loggable) representation.
1874 */
1875 static char digits[] = "0123456789abcdef";
1876 static int ip6round = 0;
1877 char *
1878 ip6_sprintf(addr)
1879 const struct in6_addr *addr;
1880 {
1881 static char ip6buf[8][48];
1882 int i;
1883 char *cp;
1884 const u_int16_t *a = (const u_int16_t *)addr;
1885 const u_int8_t *d;
1886 int dcolon = 0;
1887
1888 ip6round = (ip6round + 1) & 7;
1889 cp = ip6buf[ip6round];
1890
1891 for (i = 0; i < 8; i++) {
1892 if (dcolon == 1) {
1893 if (*a == 0) {
1894 if (i == 7)
1895 *cp++ = ':';
1896 a++;
1897 continue;
1898 } else
1899 dcolon = 2;
1900 }
1901 if (*a == 0) {
1902 if (dcolon == 0 && *(a + 1) == 0) {
1903 if (i == 0)
1904 *cp++ = ':';
1905 *cp++ = ':';
1906 dcolon = 1;
1907 } else {
1908 *cp++ = '';
1909 *cp++ = ':';
1910 }
1911 a++;
1912 continue;
1913 }
1914 d = (const u_char *)a;
1915 *cp++ = digits[*d >> 4];
1916 *cp++ = digits[*d++ & 0xf];
1917 *cp++ = digits[*d >> 4];
1918 *cp++ = digits[*d & 0xf];
1919 *cp++ = ':';
1920 a++;
1921 }
1922 *--cp = 0;
1923 return (ip6buf[ip6round]);
1924 }
1925
1926 int
1927 in6_localaddr(in6)
1928 struct in6_addr *in6;
1929 {
1930 struct in6_ifaddr *ia;
1931
1932 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1933 return 1;
1934
1935 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1936 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1937 &ia->ia_prefixmask.sin6_addr)) {
1938 return 1;
1939 }
1940 }
1941
1942 return (0);
1943 }
1944
1945 int
1946 in6_is_addr_deprecated(sa6)
1947 struct sockaddr_in6 *sa6;
1948 {
1949 struct in6_ifaddr *ia;
1950
1951 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1952 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1953 &sa6->sin6_addr) &&
1954 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1955 return (1); /* true */
1956
1957 /* XXX: do we still have to go thru the rest of the list? */
1958 }
1959
1960 return (0); /* false */
1961 }
1962
1963 /*
1964 * return length of part which dst and src are equal
1965 * hard coding...
1966 */
1967 int
1968 in6_matchlen(src, dst)
1969 struct in6_addr *src, *dst;
1970 {
1971 int match = 0;
1972 u_char *s = (u_char *)src, *d = (u_char *)dst;
1973 u_char *lim = s + 16, r;
1974
1975 while (s < lim)
1976 if ((r = (*d++ ^ *s++)) != 0) {
1977 while (r < 128) {
1978 match++;
1979 r <<= 1;
1980 }
1981 break;
1982 } else
1983 match += 8;
1984 return match;
1985 }
1986
1987 /* XXX: to be scope conscious */
1988 int
1989 in6_are_prefix_equal(p1, p2, len)
1990 struct in6_addr *p1, *p2;
1991 int len;
1992 {
1993 int bytelen, bitlen;
1994
1995 /* sanity check */
1996 if (0 > len || len > 128) {
1997 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1998 len);
1999 return (0);
2000 }
2001
2002 bytelen = len / 8;
2003 bitlen = len % 8;
2004
2005 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2006 return (0);
2007 if (bitlen != 0 &&
2008 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2009 p2->s6_addr[bytelen] >> (8 - bitlen))
2010 return (0);
2011
2012 return (1);
2013 }
2014
2015 void
2016 in6_prefixlen2mask(maskp, len)
2017 struct in6_addr *maskp;
2018 int len;
2019 {
2020 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2021 int bytelen, bitlen, i;
2022
2023 /* sanity check */
2024 if (0 > len || len > 128) {
2025 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2026 len);
2027 return;
2028 }
2029
2030 bzero(maskp, sizeof(*maskp));
2031 bytelen = len / 8;
2032 bitlen = len % 8;
2033 for (i = 0; i < bytelen; i++)
2034 maskp->s6_addr[i] = 0xff;
2035 if (bitlen)
2036 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2037 }
2038
2039 /*
2040 * return the best address out of the same scope. if no address was
2041 * found, return the first valid address from designated IF.
2042 */
2043 struct in6_ifaddr *
2044 in6_ifawithifp(ifp, dst)
2045 struct ifnet *ifp;
2046 struct in6_addr *dst;
2047 {
2048 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2049 struct ifaddr *ifa;
2050 struct in6_ifaddr *besta = 0;
2051 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2052
2053 dep[0] = dep[1] = NULL;
2054
2055 /*
2056 * We first look for addresses in the same scope.
2057 * If there is one, return it.
2058 * If two or more, return one which matches the dst longest.
2059 * If none, return one of global addresses assigned other ifs.
2060 */
2061 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2062 if (ifa->ifa_addr->sa_family != AF_INET6)
2063 continue;
2064 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2065 continue; /* XXX: is there any case to allow anycast? */
2066 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2067 continue; /* don't use this interface */
2068 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2069 continue;
2070 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2071 if (ip6_use_deprecated)
2072 dep[0] = (struct in6_ifaddr *)ifa;
2073 continue;
2074 }
2075
2076 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2077 /*
2078 * call in6_matchlen() as few as possible
2079 */
2080 if (besta) {
2081 if (blen == -1)
2082 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2083 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2084 if (tlen > blen) {
2085 blen = tlen;
2086 besta = (struct in6_ifaddr *)ifa;
2087 }
2088 } else
2089 besta = (struct in6_ifaddr *)ifa;
2090 }
2091 }
2092 if (besta)
2093 return (besta);
2094
2095 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2096 if (ifa->ifa_addr->sa_family != AF_INET6)
2097 continue;
2098 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2099 continue; /* XXX: is there any case to allow anycast? */
2100 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2101 continue; /* don't use this interface */
2102 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2103 continue;
2104 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2105 if (ip6_use_deprecated)
2106 dep[1] = (struct in6_ifaddr *)ifa;
2107 continue;
2108 }
2109
2110 return (struct in6_ifaddr *)ifa;
2111 }
2112
2113 /* use the last-resort values, that are, deprecated addresses */
2114 if (dep[0])
2115 return dep[0];
2116 if (dep[1])
2117 return dep[1];
2118
2119 return NULL;
2120 }
2121
2122 /*
2123 * perform DAD when interface becomes IFF_UP.
2124 */
2125 void
2126 in6_if_up(ifp)
2127 struct ifnet *ifp;
2128 {
2129 struct ifaddr *ifa;
2130 struct in6_ifaddr *ia;
2131
2132 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2133 if (ifa->ifa_addr->sa_family != AF_INET6)
2134 continue;
2135 ia = (struct in6_ifaddr *)ifa;
2136 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2137 /*
2138 * The TENTATIVE flag was likely set by hand
2139 * beforehand, implicitly indicating the need for DAD.
2140 * We may be able to skip the random delay in this
2141 * case, but we impose delays just in case.
2142 */
2143 nd6_dad_start(ifa,
2144 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2145 }
2146 }
2147
2148 /*
2149 * special cases, like 6to4, are handled in in6_ifattach
2150 */
2151 in6_ifattach(ifp, NULL);
2152 }
2153
2154 int
2155 in6if_do_dad(ifp)
2156 struct ifnet *ifp;
2157 {
2158 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2159 return (0);
2160
2161 switch (ifp->if_type) {
2162 #ifdef IFT_DUMMY
2163 case IFT_DUMMY:
2164 #endif
2165 case IFT_FAITH:
2166 /*
2167 * These interfaces do not have the IFF_LOOPBACK flag,
2168 * but loop packets back. We do not have to do DAD on such
2169 * interfaces. We should even omit it, because loop-backed
2170 * NS would confuse the DAD procedure.
2171 */
2172 return (0);
2173 default:
2174 /*
2175 * Our DAD routine requires the interface up and running.
2176 * However, some interfaces can be up before the RUNNING
2177 * status. Additionaly, users may try to assign addresses
2178 * before the interface becomes up (or running).
2179 * We simply skip DAD in such a case as a work around.
2180 * XXX: we should rather mark "tentative" on such addresses,
2181 * and do DAD after the interface becomes ready.
2182 */
2183 if (!((ifp->if_flags & IFF_UP) &&
2184 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2185 return (0);
2186
2187 return (1);
2188 }
2189 }
2190
2191 /*
2192 * Calculate max IPv6 MTU through all the interfaces and store it
2193 * to in6_maxmtu.
2194 */
2195 void
2196 in6_setmaxmtu()
2197 {
2198 unsigned long maxmtu = 0;
2199 struct ifnet *ifp;
2200
2201 IFNET_RLOCK();
2202 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
2203 /* this function can be called during ifnet initialization */
2204 if (!ifp->if_afdata[AF_INET6])
2205 continue;
2206 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2207 IN6_LINKMTU(ifp) > maxmtu)
2208 maxmtu = IN6_LINKMTU(ifp);
2209 }
2210 IFNET_RUNLOCK();
2211 if (maxmtu) /* update only when maxmtu is positive */
2212 in6_maxmtu = maxmtu;
2213 }
2214
2215 /*
2216 * Provide the length of interface identifiers to be used for the link attached
2217 * to the given interface. The length should be defined in "IPv6 over
2218 * xxx-link" document. Note that address architecture might also define
2219 * the length for a particular set of address prefixes, regardless of the
2220 * link type. As clarified in rfc2462bis, those two definitions should be
2221 * consistent, and those really are as of August 2004.
2222 */
2223 int
2224 in6_if2idlen(ifp)
2225 struct ifnet *ifp;
2226 {
2227 switch (ifp->if_type) {
2228 case IFT_ETHER: /* RFC2464 */
2229 #ifdef IFT_PROPVIRTUAL
2230 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2231 #endif
2232 #ifdef IFT_L2VLAN
2233 case IFT_L2VLAN: /* ditto */
2234 #endif
2235 #ifdef IFT_IEEE80211
2236 case IFT_IEEE80211: /* ditto */
2237 #endif
2238 #ifdef IFT_MIP
2239 case IFT_MIP: /* ditto */
2240 #endif
2241 return (64);
2242 case IFT_FDDI: /* RFC2467 */
2243 return (64);
2244 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2245 return (64);
2246 case IFT_PPP: /* RFC2472 */
2247 return (64);
2248 case IFT_ARCNET: /* RFC2497 */
2249 return (64);
2250 case IFT_FRELAY: /* RFC2590 */
2251 return (64);
2252 case IFT_IEEE1394: /* RFC3146 */
2253 return (64);
2254 case IFT_GIF:
2255 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2256 case IFT_LOOP:
2257 return (64); /* XXX: is this really correct? */
2258 default:
2259 /*
2260 * Unknown link type:
2261 * It might be controversial to use the today's common constant
2262 * of 64 for these cases unconditionally. For full compliance,
2263 * we should return an error in this case. On the other hand,
2264 * if we simply miss the standard for the link type or a new
2265 * standard is defined for a new link type, the IFID length
2266 * is very likely to be the common constant. As a compromise,
2267 * we always use the constant, but make an explicit notice
2268 * indicating the "unknown" case.
2269 */
2270 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2271 return (64);
2272 }
2273 }
2274
2275 void *
2276 in6_domifattach(ifp)
2277 struct ifnet *ifp;
2278 {
2279 struct in6_ifextra *ext;
2280
2281 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2282 bzero(ext, sizeof(*ext));
2283
2284 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2285 M_IFADDR, M_WAITOK);
2286 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2287
2288 ext->icmp6_ifstat =
2289 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2290 M_IFADDR, M_WAITOK);
2291 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2292
2293 ext->nd_ifinfo = nd6_ifattach(ifp);
2294 ext->scope6_id = scope6_ifattach(ifp);
2295 return ext;
2296 }
2297
2298 void
2299 in6_domifdetach(ifp, aux)
2300 struct ifnet *ifp;
2301 void *aux;
2302 {
2303 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2304
2305 scope6_ifdetach(ext->scope6_id);
2306 nd6_ifdetach(ext->nd_ifinfo);
2307 free(ext->in6_ifstat, M_IFADDR);
2308 free(ext->icmp6_ifstat, M_IFADDR);
2309 free(ext, M_IFADDR);
2310 }
2311
2312 /*
2313 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2314 * v4 mapped addr or v4 compat addr
2315 */
2316 void
2317 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2318 {
2319 bzero(sin, sizeof(*sin));
2320 sin->sin_len = sizeof(struct sockaddr_in);
2321 sin->sin_family = AF_INET;
2322 sin->sin_port = sin6->sin6_port;
2323 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2324 }
2325
2326 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2327 void
2328 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2329 {
2330 bzero(sin6, sizeof(*sin6));
2331 sin6->sin6_len = sizeof(struct sockaddr_in6);
2332 sin6->sin6_family = AF_INET6;
2333 sin6->sin6_port = sin->sin_port;
2334 sin6->sin6_addr.s6_addr32[0] = 0;
2335 sin6->sin6_addr.s6_addr32[1] = 0;
2336 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2337 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2338 }
2339
2340 /* Convert sockaddr_in6 into sockaddr_in. */
2341 void
2342 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2343 {
2344 struct sockaddr_in *sin_p;
2345 struct sockaddr_in6 sin6;
2346
2347 /*
2348 * Save original sockaddr_in6 addr and convert it
2349 * to sockaddr_in.
2350 */
2351 sin6 = *(struct sockaddr_in6 *)nam;
2352 sin_p = (struct sockaddr_in *)nam;
2353 in6_sin6_2_sin(sin_p, &sin6);
2354 }
2355
2356 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2357 void
2358 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2359 {
2360 struct sockaddr_in *sin_p;
2361 struct sockaddr_in6 *sin6_p;
2362
2363 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
2364 M_WAITOK);
2365 sin_p = (struct sockaddr_in *)*nam;
2366 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2367 FREE(*nam, M_SONAME);
2368 *nam = (struct sockaddr *)sin6_p;
2369 }
Cache object: 945e68ab049762eb57a3c2584896dd07
|