FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in.c 8.2 (Berkeley) 11/15/93
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68
69 #include <sys/param.h>
70 #include <sys/errno.h>
71 #include <sys/malloc.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/sockio.h>
75 #include <sys/systm.h>
76 #include <sys/priv.h>
77 #include <sys/proc.h>
78 #include <sys/time.h>
79 #include <sys/kernel.h>
80 #include <sys/syslog.h>
81
82 #include <net/if.h>
83 #include <net/if_types.h>
84 #include <net/route.h>
85 #include <net/if_dl.h>
86
87 #include <netinet/in.h>
88 #include <netinet/in_var.h>
89 #include <netinet/if_ether.h>
90 #include <netinet/in_systm.h>
91 #include <netinet/ip.h>
92 #include <netinet/in_pcb.h>
93
94 #include <netinet/ip6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/nd6.h>
97 #include <netinet6/mld6_var.h>
98 #include <netinet6/ip6_mroute.h>
99 #include <netinet6/in6_ifattach.h>
100 #include <netinet6/scope6_var.h>
101 #include <netinet6/in6_pcb.h>
102
103 MALLOC_DEFINE(M_IP6MADDR, "in6_multi", "internet multicast address");
104
105 /*
106 * Definitions of some costant IP6 addresses.
107 */
108 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
109 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
110 const struct in6_addr in6addr_nodelocal_allnodes =
111 IN6ADDR_NODELOCAL_ALLNODES_INIT;
112 const struct in6_addr in6addr_linklocal_allnodes =
113 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
114 const struct in6_addr in6addr_linklocal_allrouters =
115 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
116
117 const struct in6_addr in6mask0 = IN6MASK0;
118 const struct in6_addr in6mask32 = IN6MASK32;
119 const struct in6_addr in6mask64 = IN6MASK64;
120 const struct in6_addr in6mask96 = IN6MASK96;
121 const struct in6_addr in6mask128 = IN6MASK128;
122
123 const struct sockaddr_in6 sa6_any =
124 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
125
126 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
127 struct ifnet *, struct thread *));
128 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
129 struct sockaddr_in6 *, int));
130 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
131
132 struct in6_multihead in6_multihead; /* XXX BSS initialization */
133 int (*faithprefix_p)(struct in6_addr *);
134
135 /*
136 * Subroutine for in6_ifaddloop() and in6_ifremloop().
137 * This routine does actual work.
138 */
139 static void
140 in6_ifloop_request(int cmd, struct ifaddr *ifa)
141 {
142 struct sockaddr_in6 all1_sa;
143 struct rtentry *nrt = NULL;
144 int e;
145 char ip6buf[INET6_ADDRSTRLEN];
146
147 bzero(&all1_sa, sizeof(all1_sa));
148 all1_sa.sin6_family = AF_INET6;
149 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
150 all1_sa.sin6_addr = in6mask128;
151
152 /*
153 * We specify the address itself as the gateway, and set the
154 * RTF_LLINFO flag, so that the corresponding host route would have
155 * the flag, and thus applications that assume traditional behavior
156 * would be happy. Note that we assume the caller of the function
157 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
158 * which changes the outgoing interface to the loopback interface.
159 */
160 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
161 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
162 if (e != 0) {
163 /* XXX need more descriptive message */
164
165 log(LOG_ERR, "in6_ifloop_request: "
166 "%s operation failed for %s (errno=%d)\n",
167 cmd == RTM_ADD ? "ADD" : "DELETE",
168 ip6_sprintf(ip6buf,
169 &((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), e);
170 }
171
172 /*
173 * Report the addition/removal of the address to the routing socket.
174 * XXX: since we called rtinit for a p2p interface with a destination,
175 * we end up reporting twice in such a case. Should we rather
176 * omit the second report?
177 */
178 if (nrt) {
179 RT_LOCK(nrt);
180 /*
181 * Make sure rt_ifa be equal to IFA, the second argument of
182 * the function. We need this because when we refer to
183 * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa
184 * points to the address instead of the loopback address.
185 */
186 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) {
187 IFAFREE(nrt->rt_ifa);
188 IFAREF(ifa);
189 nrt->rt_ifa = ifa;
190 }
191
192 rt_newaddrmsg(cmd, ifa, e, nrt);
193 if (cmd == RTM_DELETE)
194 RTFREE_LOCKED(nrt);
195 else {
196 /* the cmd must be RTM_ADD here */
197 RT_REMREF(nrt);
198 RT_UNLOCK(nrt);
199 }
200 }
201 }
202
203 /*
204 * Add ownaddr as loopback rtentry. We previously add the route only if
205 * necessary (ex. on a p2p link). However, since we now manage addresses
206 * separately from prefixes, we should always add the route. We can't
207 * rely on the cloning mechanism from the corresponding interface route
208 * any more.
209 */
210 void
211 in6_ifaddloop(struct ifaddr *ifa)
212 {
213 struct rtentry *rt;
214 int need_loop;
215
216 /* If there is no loopback entry, allocate one. */
217 rt = rtalloc1(ifa->ifa_addr, 0, 0);
218 need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
219 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0);
220 if (rt)
221 RTFREE_LOCKED(rt);
222 if (need_loop)
223 in6_ifloop_request(RTM_ADD, ifa);
224 }
225
226 /*
227 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
228 * if it exists.
229 */
230 void
231 in6_ifremloop(struct ifaddr *ifa)
232 {
233 struct in6_ifaddr *ia;
234 struct rtentry *rt;
235 int ia_count = 0;
236
237 /*
238 * Some of BSD variants do not remove cloned routes
239 * from an interface direct route, when removing the direct route
240 * (see comments in net/net_osdep.h). Even for variants that do remove
241 * cloned routes, they could fail to remove the cloned routes when
242 * we handle multple addresses that share a common prefix.
243 * So, we should remove the route corresponding to the deleted address.
244 */
245
246 /*
247 * Delete the entry only if exact one ifa exists. More than one ifa
248 * can exist if we assign a same single address to multiple
249 * (probably p2p) interfaces.
250 * XXX: we should avoid such a configuration in IPv6...
251 */
252 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
253 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
254 ia_count++;
255 if (ia_count > 1)
256 break;
257 }
258 }
259
260 if (ia_count == 1) {
261 /*
262 * Before deleting, check if a corresponding loopbacked host
263 * route surely exists. With this check, we can avoid to
264 * delete an interface direct route whose destination is same
265 * as the address being removed. This can happen when removing
266 * a subnet-router anycast address on an interface attahced
267 * to a shared medium.
268 */
269 rt = rtalloc1(ifa->ifa_addr, 0, 0);
270 if (rt != NULL) {
271 if ((rt->rt_flags & RTF_HOST) != 0 &&
272 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
273 RTFREE_LOCKED(rt);
274 in6_ifloop_request(RTM_DELETE, ifa);
275 } else
276 RT_UNLOCK(rt);
277 }
278 }
279 }
280
281 int
282 in6_mask2len(struct in6_addr *mask, u_char *lim0)
283 {
284 int x = 0, y;
285 u_char *lim = lim0, *p;
286
287 /* ignore the scope_id part */
288 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
289 lim = (u_char *)mask + sizeof(*mask);
290 for (p = (u_char *)mask; p < lim; x++, p++) {
291 if (*p != 0xff)
292 break;
293 }
294 y = 0;
295 if (p < lim) {
296 for (y = 0; y < 8; y++) {
297 if ((*p & (0x80 >> y)) == 0)
298 break;
299 }
300 }
301
302 /*
303 * when the limit pointer is given, do a stricter check on the
304 * remaining bits.
305 */
306 if (p < lim) {
307 if (y != 0 && (*p & (0x00ff >> y)) != 0)
308 return (-1);
309 for (p = p + 1; p < lim; p++)
310 if (*p != 0)
311 return (-1);
312 }
313
314 return x * 8 + y;
315 }
316
317 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
318 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
319
320 int
321 in6_control(struct socket *so, u_long cmd, caddr_t data,
322 struct ifnet *ifp, struct thread *td)
323 {
324 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
325 struct in6_ifaddr *ia = NULL;
326 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
327 struct sockaddr_in6 *sa6;
328 int error;
329
330 switch (cmd) {
331 case SIOCGETSGCNT_IN6:
332 case SIOCGETMIFCNT_IN6:
333 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
334 }
335
336 switch(cmd) {
337 case SIOCAADDRCTL_POLICY:
338 case SIOCDADDRCTL_POLICY:
339 if (td != NULL) {
340 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
341 if (error)
342 return (error);
343 }
344 return (in6_src_ioctl(cmd, data));
345 }
346
347 if (ifp == NULL)
348 return (EOPNOTSUPP);
349
350 switch (cmd) {
351 case SIOCSNDFLUSH_IN6:
352 case SIOCSPFXFLUSH_IN6:
353 case SIOCSRTRFLUSH_IN6:
354 case SIOCSDEFIFACE_IN6:
355 case SIOCSIFINFO_FLAGS:
356 case SIOCSIFINFO_IN6:
357 if (td != NULL) {
358 error = priv_check(td, PRIV_NETINET_ND6);
359 if (error)
360 return (error);
361 }
362 /* FALLTHROUGH */
363 case OSIOCGIFINFO_IN6:
364 case SIOCGIFINFO_IN6:
365 case SIOCGDRLST_IN6:
366 case SIOCGPRLST_IN6:
367 case SIOCGNBRINFO_IN6:
368 case SIOCGDEFIFACE_IN6:
369 return (nd6_ioctl(cmd, data, ifp));
370 }
371
372 switch (cmd) {
373 case SIOCSIFPREFIX_IN6:
374 case SIOCDIFPREFIX_IN6:
375 case SIOCAIFPREFIX_IN6:
376 case SIOCCIFPREFIX_IN6:
377 case SIOCSGIFPREFIX_IN6:
378 case SIOCGIFPREFIX_IN6:
379 log(LOG_NOTICE,
380 "prefix ioctls are now invalidated. "
381 "please use ifconfig.\n");
382 return (EOPNOTSUPP);
383 }
384
385 switch (cmd) {
386 case SIOCSSCOPE6:
387 if (td != NULL) {
388 error = priv_check(td, PRIV_NETINET_SCOPE6);
389 if (error)
390 return (error);
391 }
392 return (scope6_set(ifp,
393 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
394 case SIOCGSCOPE6:
395 return (scope6_get(ifp,
396 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
397 case SIOCGSCOPE6DEF:
398 return (scope6_get_default((struct scope6_id *)
399 ifr->ifr_ifru.ifru_scope_id));
400 }
401
402 switch (cmd) {
403 case SIOCALIFADDR:
404 if (td != NULL) {
405 error = priv_check(td, PRIV_NET_ADDIFADDR);
406 if (error)
407 return (error);
408 }
409 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
410
411 case SIOCDLIFADDR:
412 if (td != NULL) {
413 error = priv_check(td, PRIV_NET_DELIFADDR);
414 if (error)
415 return (error);
416 }
417 /* FALLTHROUGH */
418 case SIOCGLIFADDR:
419 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
420 }
421
422 /*
423 * Find address for this interface, if it exists.
424 *
425 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
426 * only, and used the first interface address as the target of other
427 * operations (without checking ifra_addr). This was because netinet
428 * code/API assumed at most 1 interface address per interface.
429 * Since IPv6 allows a node to assign multiple addresses
430 * on a single interface, we almost always look and check the
431 * presence of ifra_addr, and reject invalid ones here.
432 * It also decreases duplicated code among SIOC*_IN6 operations.
433 */
434 switch (cmd) {
435 case SIOCAIFADDR_IN6:
436 case SIOCSIFPHYADDR_IN6:
437 sa6 = &ifra->ifra_addr;
438 break;
439 case SIOCSIFADDR_IN6:
440 case SIOCGIFADDR_IN6:
441 case SIOCSIFDSTADDR_IN6:
442 case SIOCSIFNETMASK_IN6:
443 case SIOCGIFDSTADDR_IN6:
444 case SIOCGIFNETMASK_IN6:
445 case SIOCDIFADDR_IN6:
446 case SIOCGIFPSRCADDR_IN6:
447 case SIOCGIFPDSTADDR_IN6:
448 case SIOCGIFAFLAG_IN6:
449 case SIOCSNDFLUSH_IN6:
450 case SIOCSPFXFLUSH_IN6:
451 case SIOCSRTRFLUSH_IN6:
452 case SIOCGIFALIFETIME_IN6:
453 case SIOCSIFALIFETIME_IN6:
454 case SIOCGIFSTAT_IN6:
455 case SIOCGIFSTAT_ICMP6:
456 sa6 = &ifr->ifr_addr;
457 break;
458 default:
459 sa6 = NULL;
460 break;
461 }
462 if (sa6 && sa6->sin6_family == AF_INET6) {
463 int error = 0;
464
465 if (sa6->sin6_scope_id != 0)
466 error = sa6_embedscope(sa6, 0);
467 else
468 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
469 if (error != 0)
470 return (error);
471 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
472 } else
473 ia = NULL;
474
475 switch (cmd) {
476 case SIOCSIFADDR_IN6:
477 case SIOCSIFDSTADDR_IN6:
478 case SIOCSIFNETMASK_IN6:
479 /*
480 * Since IPv6 allows a node to assign multiple addresses
481 * on a single interface, SIOCSIFxxx ioctls are deprecated.
482 */
483 /* we decided to obsolete this command (20000704) */
484 return (EINVAL);
485
486 case SIOCDIFADDR_IN6:
487 /*
488 * for IPv4, we look for existing in_ifaddr here to allow
489 * "ifconfig if0 delete" to remove the first IPv4 address on
490 * the interface. For IPv6, as the spec allows multiple
491 * interface address from the day one, we consider "remove the
492 * first one" semantics to be not preferable.
493 */
494 if (ia == NULL)
495 return (EADDRNOTAVAIL);
496 /* FALLTHROUGH */
497 case SIOCAIFADDR_IN6:
498 /*
499 * We always require users to specify a valid IPv6 address for
500 * the corresponding operation.
501 */
502 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
503 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
504 return (EAFNOSUPPORT);
505
506 if (td != NULL) {
507 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
508 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
509 if (error)
510 return (error);
511 }
512
513 break;
514
515 case SIOCGIFADDR_IN6:
516 /* This interface is basically deprecated. use SIOCGIFCONF. */
517 /* FALLTHROUGH */
518 case SIOCGIFAFLAG_IN6:
519 case SIOCGIFNETMASK_IN6:
520 case SIOCGIFDSTADDR_IN6:
521 case SIOCGIFALIFETIME_IN6:
522 /* must think again about its semantics */
523 if (ia == NULL)
524 return (EADDRNOTAVAIL);
525 break;
526 case SIOCSIFALIFETIME_IN6:
527 {
528 struct in6_addrlifetime *lt;
529
530 if (td != NULL) {
531 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
532 if (error)
533 return (error);
534 }
535 if (ia == NULL)
536 return (EADDRNOTAVAIL);
537 /* sanity for overflow - beware unsigned */
538 lt = &ifr->ifr_ifru.ifru_lifetime;
539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
540 lt->ia6t_vltime + time_second < time_second) {
541 return EINVAL;
542 }
543 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
544 lt->ia6t_pltime + time_second < time_second) {
545 return EINVAL;
546 }
547 break;
548 }
549 }
550
551 switch (cmd) {
552
553 case SIOCGIFADDR_IN6:
554 ifr->ifr_addr = ia->ia_addr;
555 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
556 return (error);
557 break;
558
559 case SIOCGIFDSTADDR_IN6:
560 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
561 return (EINVAL);
562 /*
563 * XXX: should we check if ifa_dstaddr is NULL and return
564 * an error?
565 */
566 ifr->ifr_dstaddr = ia->ia_dstaddr;
567 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
568 return (error);
569 break;
570
571 case SIOCGIFNETMASK_IN6:
572 ifr->ifr_addr = ia->ia_prefixmask;
573 break;
574
575 case SIOCGIFAFLAG_IN6:
576 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
577 break;
578
579 case SIOCGIFSTAT_IN6:
580 if (ifp == NULL)
581 return EINVAL;
582 bzero(&ifr->ifr_ifru.ifru_stat,
583 sizeof(ifr->ifr_ifru.ifru_stat));
584 ifr->ifr_ifru.ifru_stat =
585 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
586 break;
587
588 case SIOCGIFSTAT_ICMP6:
589 if (ifp == NULL)
590 return EINVAL;
591 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
592 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
593 ifr->ifr_ifru.ifru_icmp6stat =
594 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
595 break;
596
597 case SIOCGIFALIFETIME_IN6:
598 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
599 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
600 time_t maxexpire;
601 struct in6_addrlifetime *retlt =
602 &ifr->ifr_ifru.ifru_lifetime;
603
604 /*
605 * XXX: adjust expiration time assuming time_t is
606 * signed.
607 */
608 maxexpire = (-1) &
609 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
610 if (ia->ia6_lifetime.ia6t_vltime <
611 maxexpire - ia->ia6_updatetime) {
612 retlt->ia6t_expire = ia->ia6_updatetime +
613 ia->ia6_lifetime.ia6t_vltime;
614 } else
615 retlt->ia6t_expire = maxexpire;
616 }
617 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
618 time_t maxexpire;
619 struct in6_addrlifetime *retlt =
620 &ifr->ifr_ifru.ifru_lifetime;
621
622 /*
623 * XXX: adjust expiration time assuming time_t is
624 * signed.
625 */
626 maxexpire = (-1) &
627 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
628 if (ia->ia6_lifetime.ia6t_pltime <
629 maxexpire - ia->ia6_updatetime) {
630 retlt->ia6t_preferred = ia->ia6_updatetime +
631 ia->ia6_lifetime.ia6t_pltime;
632 } else
633 retlt->ia6t_preferred = maxexpire;
634 }
635 break;
636
637 case SIOCSIFALIFETIME_IN6:
638 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
639 /* for sanity */
640 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
641 ia->ia6_lifetime.ia6t_expire =
642 time_second + ia->ia6_lifetime.ia6t_vltime;
643 } else
644 ia->ia6_lifetime.ia6t_expire = 0;
645 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
646 ia->ia6_lifetime.ia6t_preferred =
647 time_second + ia->ia6_lifetime.ia6t_pltime;
648 } else
649 ia->ia6_lifetime.ia6t_preferred = 0;
650 break;
651
652 case SIOCAIFADDR_IN6:
653 {
654 int i, error = 0;
655 struct nd_prefixctl pr0;
656 struct nd_prefix *pr;
657
658 /*
659 * first, make or update the interface address structure,
660 * and link it to the list.
661 */
662 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
663 return (error);
664 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
665 == NULL) {
666 /*
667 * this can happen when the user specify the 0 valid
668 * lifetime.
669 */
670 break;
671 }
672
673 /*
674 * then, make the prefix on-link on the interface.
675 * XXX: we'd rather create the prefix before the address, but
676 * we need at least one address to install the corresponding
677 * interface route, so we configure the address first.
678 */
679
680 /*
681 * convert mask to prefix length (prefixmask has already
682 * been validated in in6_update_ifa().
683 */
684 bzero(&pr0, sizeof(pr0));
685 pr0.ndpr_ifp = ifp;
686 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
687 NULL);
688 if (pr0.ndpr_plen == 128) {
689 break; /* we don't need to install a host route. */
690 }
691 pr0.ndpr_prefix = ifra->ifra_addr;
692 /* apply the mask for safety. */
693 for (i = 0; i < 4; i++) {
694 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
695 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
696 }
697 /*
698 * XXX: since we don't have an API to set prefix (not address)
699 * lifetimes, we just use the same lifetimes as addresses.
700 * The (temporarily) installed lifetimes can be overridden by
701 * later advertised RAs (when accept_rtadv is non 0), which is
702 * an intended behavior.
703 */
704 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
705 pr0.ndpr_raf_auto =
706 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
707 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
708 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
709
710 /* add the prefix if not yet. */
711 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
712 /*
713 * nd6_prelist_add will install the corresponding
714 * interface route.
715 */
716 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
717 return (error);
718 if (pr == NULL) {
719 log(LOG_ERR, "nd6_prelist_add succeeded but "
720 "no prefix\n");
721 return (EINVAL); /* XXX panic here? */
722 }
723 }
724
725 /* relate the address to the prefix */
726 if (ia->ia6_ndpr == NULL) {
727 ia->ia6_ndpr = pr;
728 pr->ndpr_refcnt++;
729
730 /*
731 * If this is the first autoconf address from the
732 * prefix, create a temporary address as well
733 * (when required).
734 */
735 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
736 ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
737 int e;
738 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
739 log(LOG_NOTICE, "in6_control: failed "
740 "to create a temporary address, "
741 "errno=%d\n", e);
742 }
743 }
744 }
745
746 /*
747 * this might affect the status of autoconfigured addresses,
748 * that is, this address might make other addresses detached.
749 */
750 pfxlist_onlink_check();
751 if (error == 0 && ia)
752 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
753 break;
754 }
755
756 case SIOCDIFADDR_IN6:
757 {
758 struct nd_prefix *pr;
759
760 /*
761 * If the address being deleted is the only one that owns
762 * the corresponding prefix, expire the prefix as well.
763 * XXX: theoretically, we don't have to worry about such
764 * relationship, since we separate the address management
765 * and the prefix management. We do this, however, to provide
766 * as much backward compatibility as possible in terms of
767 * the ioctl operation.
768 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
769 */
770 pr = ia->ia6_ndpr;
771 in6_purgeaddr(&ia->ia_ifa);
772 if (pr && pr->ndpr_refcnt == 0)
773 prelist_remove(pr);
774 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
775 break;
776 }
777
778 default:
779 if (ifp == NULL || ifp->if_ioctl == 0)
780 return (EOPNOTSUPP);
781 return ((*ifp->if_ioctl)(ifp, cmd, data));
782 }
783
784 return (0);
785 }
786
787 /*
788 * Update parameters of an IPv6 interface address.
789 * If necessary, a new entry is created and linked into address chains.
790 * This function is separated from in6_control().
791 * XXX: should this be performed under splnet()?
792 */
793 int
794 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
795 struct in6_ifaddr *ia, int flags)
796 {
797 int error = 0, hostIsNew = 0, plen = -1;
798 struct in6_ifaddr *oia;
799 struct sockaddr_in6 dst6;
800 struct in6_addrlifetime *lt;
801 struct in6_multi_mship *imm;
802 struct in6_multi *in6m_sol;
803 struct rtentry *rt;
804 int delay;
805 char ip6buf[INET6_ADDRSTRLEN];
806
807 /* Validate parameters */
808 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
809 return (EINVAL);
810
811 /*
812 * The destination address for a p2p link must have a family
813 * of AF_UNSPEC or AF_INET6.
814 */
815 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
816 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
817 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
818 return (EAFNOSUPPORT);
819 /*
820 * validate ifra_prefixmask. don't check sin6_family, netmask
821 * does not carry fields other than sin6_len.
822 */
823 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
824 return (EINVAL);
825 /*
826 * Because the IPv6 address architecture is classless, we require
827 * users to specify a (non 0) prefix length (mask) for a new address.
828 * We also require the prefix (when specified) mask is valid, and thus
829 * reject a non-consecutive mask.
830 */
831 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
832 return (EINVAL);
833 if (ifra->ifra_prefixmask.sin6_len != 0) {
834 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
835 (u_char *)&ifra->ifra_prefixmask +
836 ifra->ifra_prefixmask.sin6_len);
837 if (plen <= 0)
838 return (EINVAL);
839 } else {
840 /*
841 * In this case, ia must not be NULL. We just use its prefix
842 * length.
843 */
844 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
845 }
846 /*
847 * If the destination address on a p2p interface is specified,
848 * and the address is a scoped one, validate/set the scope
849 * zone identifier.
850 */
851 dst6 = ifra->ifra_dstaddr;
852 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
853 (dst6.sin6_family == AF_INET6)) {
854 struct in6_addr in6_tmp;
855 u_int32_t zoneid;
856
857 in6_tmp = dst6.sin6_addr;
858 if (in6_setscope(&in6_tmp, ifp, &zoneid))
859 return (EINVAL); /* XXX: should be impossible */
860
861 if (dst6.sin6_scope_id != 0) {
862 if (dst6.sin6_scope_id != zoneid)
863 return (EINVAL);
864 } else /* user omit to specify the ID. */
865 dst6.sin6_scope_id = zoneid;
866
867 /* convert into the internal form */
868 if (sa6_embedscope(&dst6, 0))
869 return (EINVAL); /* XXX: should be impossible */
870 }
871 /*
872 * The destination address can be specified only for a p2p or a
873 * loopback interface. If specified, the corresponding prefix length
874 * must be 128.
875 */
876 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
877 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
878 /* XXX: noisy message */
879 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
880 "be specified for a p2p or a loopback IF only\n"));
881 return (EINVAL);
882 }
883 if (plen != 128) {
884 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
885 "be 128 when dstaddr is specified\n"));
886 return (EINVAL);
887 }
888 }
889 /* lifetime consistency check */
890 lt = &ifra->ifra_lifetime;
891 if (lt->ia6t_pltime > lt->ia6t_vltime)
892 return (EINVAL);
893 if (lt->ia6t_vltime == 0) {
894 /*
895 * the following log might be noisy, but this is a typical
896 * configuration mistake or a tool's bug.
897 */
898 nd6log((LOG_INFO,
899 "in6_update_ifa: valid lifetime is 0 for %s\n",
900 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
901
902 if (ia == NULL)
903 return (0); /* there's nothing to do */
904 }
905
906 /*
907 * If this is a new address, allocate a new ifaddr and link it
908 * into chains.
909 */
910 if (ia == NULL) {
911 hostIsNew = 1;
912 /*
913 * When in6_update_ifa() is called in a process of a received
914 * RA, it is called under an interrupt context. So, we should
915 * call malloc with M_NOWAIT.
916 */
917 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
918 M_NOWAIT);
919 if (ia == NULL)
920 return (ENOBUFS);
921 bzero((caddr_t)ia, sizeof(*ia));
922 LIST_INIT(&ia->ia6_memberships);
923 /* Initialize the address and masks, and put time stamp */
924 IFA_LOCK_INIT(&ia->ia_ifa);
925 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
926 ia->ia_addr.sin6_family = AF_INET6;
927 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
928 ia->ia6_createtime = time_second;
929 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
930 /*
931 * XXX: some functions expect that ifa_dstaddr is not
932 * NULL for p2p interfaces.
933 */
934 ia->ia_ifa.ifa_dstaddr =
935 (struct sockaddr *)&ia->ia_dstaddr;
936 } else {
937 ia->ia_ifa.ifa_dstaddr = NULL;
938 }
939 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
940
941 ia->ia_ifp = ifp;
942 if ((oia = in6_ifaddr) != NULL) {
943 for ( ; oia->ia_next; oia = oia->ia_next)
944 continue;
945 oia->ia_next = ia;
946 } else
947 in6_ifaddr = ia;
948
949 ia->ia_ifa.ifa_refcnt = 1;
950 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
951 }
952
953 /* update timestamp */
954 ia->ia6_updatetime = time_second;
955
956 /* set prefix mask */
957 if (ifra->ifra_prefixmask.sin6_len) {
958 /*
959 * We prohibit changing the prefix length of an existing
960 * address, because
961 * + such an operation should be rare in IPv6, and
962 * + the operation would confuse prefix management.
963 */
964 if (ia->ia_prefixmask.sin6_len &&
965 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
966 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
967 " existing (%s) address should not be changed\n",
968 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
969 error = EINVAL;
970 goto unlink;
971 }
972 ia->ia_prefixmask = ifra->ifra_prefixmask;
973 }
974
975 /*
976 * If a new destination address is specified, scrub the old one and
977 * install the new destination. Note that the interface must be
978 * p2p or loopback (see the check above.)
979 */
980 if (dst6.sin6_family == AF_INET6 &&
981 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
982 int e;
983
984 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
985 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
986 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
987 "a route to the old destination: %s\n",
988 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
989 /* proceed anyway... */
990 } else
991 ia->ia_flags &= ~IFA_ROUTE;
992 ia->ia_dstaddr = dst6;
993 }
994
995 /*
996 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
997 * to see if the address is deprecated or invalidated, but initialize
998 * these members for applications.
999 */
1000 ia->ia6_lifetime = ifra->ifra_lifetime;
1001 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1002 ia->ia6_lifetime.ia6t_expire =
1003 time_second + ia->ia6_lifetime.ia6t_vltime;
1004 } else
1005 ia->ia6_lifetime.ia6t_expire = 0;
1006 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1007 ia->ia6_lifetime.ia6t_preferred =
1008 time_second + ia->ia6_lifetime.ia6t_pltime;
1009 } else
1010 ia->ia6_lifetime.ia6t_preferred = 0;
1011
1012 /* reset the interface and routing table appropriately. */
1013 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1014 goto unlink;
1015
1016 /*
1017 * configure address flags.
1018 */
1019 ia->ia6_flags = ifra->ifra_flags;
1020 /*
1021 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1022 * userland, make it deprecated.
1023 */
1024 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1025 ia->ia6_lifetime.ia6t_pltime = 0;
1026 ia->ia6_lifetime.ia6t_preferred = time_second;
1027 }
1028 /*
1029 * Make the address tentative before joining multicast addresses,
1030 * so that corresponding MLD responses would not have a tentative
1031 * source address.
1032 */
1033 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1034 if (hostIsNew && in6if_do_dad(ifp))
1035 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1036
1037 /*
1038 * We are done if we have simply modified an existing address.
1039 */
1040 if (!hostIsNew)
1041 return (error);
1042
1043 /*
1044 * Beyond this point, we should call in6_purgeaddr upon an error,
1045 * not just go to unlink.
1046 */
1047
1048 /* Join necessary multicast groups */
1049 in6m_sol = NULL;
1050 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1051 struct sockaddr_in6 mltaddr, mltmask;
1052 struct in6_addr llsol;
1053
1054 /* join solicited multicast addr for new host id */
1055 bzero(&llsol, sizeof(struct in6_addr));
1056 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
1057 llsol.s6_addr32[1] = 0;
1058 llsol.s6_addr32[2] = htonl(1);
1059 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
1060 llsol.s6_addr8[12] = 0xff;
1061 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
1062 /* XXX: should not happen */
1063 log(LOG_ERR, "in6_update_ifa: "
1064 "in6_setscope failed\n");
1065 goto cleanup;
1066 }
1067 delay = 0;
1068 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1069 /*
1070 * We need a random delay for DAD on the address
1071 * being configured. It also means delaying
1072 * transmission of the corresponding MLD report to
1073 * avoid report collision.
1074 * [draft-ietf-ipv6-rfc2462bis-02.txt]
1075 */
1076 delay = arc4random() %
1077 (MAX_RTR_SOLICITATION_DELAY * hz);
1078 }
1079 imm = in6_joingroup(ifp, &llsol, &error, delay);
1080 if (imm == NULL) {
1081 nd6log((LOG_WARNING,
1082 "in6_update_ifa: addmulti failed for "
1083 "%s on %s (errno=%d)\n",
1084 ip6_sprintf(ip6buf, &llsol), if_name(ifp),
1085 error));
1086 in6_purgeaddr((struct ifaddr *)ia);
1087 return (error);
1088 }
1089 LIST_INSERT_HEAD(&ia->ia6_memberships,
1090 imm, i6mm_chain);
1091 in6m_sol = imm->i6mm_maddr;
1092
1093 bzero(&mltmask, sizeof(mltmask));
1094 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1095 mltmask.sin6_family = AF_INET6;
1096 mltmask.sin6_addr = in6mask32;
1097 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
1098
1099 /*
1100 * join link-local all-nodes address
1101 */
1102 bzero(&mltaddr, sizeof(mltaddr));
1103 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1104 mltaddr.sin6_family = AF_INET6;
1105 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1106 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1107 0)
1108 goto cleanup; /* XXX: should not fail */
1109
1110 /*
1111 * XXX: do we really need this automatic routes?
1112 * We should probably reconsider this stuff. Most applications
1113 * actually do not need the routes, since they usually specify
1114 * the outgoing interface.
1115 */
1116 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1117 if (rt) {
1118 if (memcmp(&mltaddr.sin6_addr,
1119 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1120 MLTMASK_LEN)) {
1121 RTFREE_LOCKED(rt);
1122 rt = NULL;
1123 }
1124 }
1125 if (!rt) {
1126 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
1127 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1128 (struct sockaddr *)&ia->ia_addr,
1129 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1130 (struct rtentry **)0);
1131 if (error)
1132 goto cleanup;
1133 } else
1134 RTFREE_LOCKED(rt);
1135
1136 /*
1137 * XXX: do we really need this automatic routes?
1138 * We should probably reconsider this stuff. Most applications
1139 * actually do not need the routes, since they usually specify
1140 * the outgoing interface.
1141 */
1142 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1143 if (rt) {
1144 /* XXX: only works in !SCOPEDROUTING case. */
1145 if (memcmp(&mltaddr.sin6_addr,
1146 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1147 MLTMASK_LEN)) {
1148 RTFREE_LOCKED(rt);
1149 rt = NULL;
1150 }
1151 }
1152 if (!rt) {
1153 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1154 (struct sockaddr *)&ia->ia_addr,
1155 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1156 (struct rtentry **)0);
1157 if (error)
1158 goto cleanup;
1159 } else {
1160 RTFREE_LOCKED(rt);
1161 }
1162
1163 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1164 if (!imm) {
1165 nd6log((LOG_WARNING,
1166 "in6_update_ifa: addmulti failed for "
1167 "%s on %s (errno=%d)\n",
1168 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1169 if_name(ifp), error));
1170 goto cleanup;
1171 }
1172 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1173
1174 /*
1175 * join node information group address
1176 */
1177 #define hostnamelen strlen(hostname)
1178 delay = 0;
1179 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1180 /*
1181 * The spec doesn't say anything about delay for this
1182 * group, but the same logic should apply.
1183 */
1184 delay = arc4random() %
1185 (MAX_RTR_SOLICITATION_DELAY * hz);
1186 }
1187 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1188 == 0) {
1189 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
1190 delay); /* XXX jinmei */
1191 if (!imm) {
1192 nd6log((LOG_WARNING, "in6_update_ifa: "
1193 "addmulti failed for %s on %s "
1194 "(errno=%d)\n",
1195 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1196 if_name(ifp), error));
1197 /* XXX not very fatal, go on... */
1198 } else {
1199 LIST_INSERT_HEAD(&ia->ia6_memberships,
1200 imm, i6mm_chain);
1201 }
1202 }
1203 #undef hostnamelen
1204
1205 /*
1206 * join interface-local all-nodes address.
1207 * (ff01::1%ifN, and ff01::%ifN/32)
1208 */
1209 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1210 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
1211 != 0)
1212 goto cleanup; /* XXX: should not fail */
1213 /* XXX: again, do we really need the route? */
1214 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1215 if (rt) {
1216 if (memcmp(&mltaddr.sin6_addr,
1217 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1218 MLTMASK_LEN)) {
1219 RTFREE_LOCKED(rt);
1220 rt = NULL;
1221 }
1222 }
1223 if (!rt) {
1224 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1225 (struct sockaddr *)&ia->ia_addr,
1226 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1227 (struct rtentry **)0);
1228 if (error)
1229 goto cleanup;
1230 } else
1231 RTFREE_LOCKED(rt);
1232
1233 /* XXX: again, do we really need the route? */
1234 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1235 if (rt) {
1236 if (memcmp(&mltaddr.sin6_addr,
1237 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1238 MLTMASK_LEN)) {
1239 RTFREE_LOCKED(rt);
1240 rt = NULL;
1241 }
1242 }
1243 if (!rt) {
1244 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1245 (struct sockaddr *)&ia->ia_addr,
1246 (struct sockaddr *)&mltmask, RTF_UP | RTF_CLONING,
1247 (struct rtentry **)0);
1248 if (error)
1249 goto cleanup;
1250 } else {
1251 RTFREE_LOCKED(rt);
1252 }
1253
1254 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1255 if (!imm) {
1256 nd6log((LOG_WARNING, "in6_update_ifa: "
1257 "addmulti failed for %s on %s "
1258 "(errno=%d)\n",
1259 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1260 if_name(ifp), error));
1261 goto cleanup;
1262 }
1263 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1264 #undef MLTMASK_LEN
1265 }
1266
1267 /*
1268 * Perform DAD, if needed.
1269 * XXX It may be of use, if we can administratively
1270 * disable DAD.
1271 */
1272 if (hostIsNew && in6if_do_dad(ifp) &&
1273 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1274 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1275 {
1276 int mindelay, maxdelay;
1277
1278 delay = 0;
1279 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1280 /*
1281 * We need to impose a delay before sending an NS
1282 * for DAD. Check if we also needed a delay for the
1283 * corresponding MLD message. If we did, the delay
1284 * should be larger than the MLD delay (this could be
1285 * relaxed a bit, but this simple logic is at least
1286 * safe).
1287 */
1288 mindelay = 0;
1289 if (in6m_sol != NULL &&
1290 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1291 mindelay = in6m_sol->in6m_timer;
1292 }
1293 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1294 if (maxdelay - mindelay == 0)
1295 delay = 0;
1296 else {
1297 delay =
1298 (arc4random() % (maxdelay - mindelay)) +
1299 mindelay;
1300 }
1301 }
1302 nd6_dad_start((struct ifaddr *)ia, delay);
1303 }
1304
1305 return (error);
1306
1307 unlink:
1308 /*
1309 * XXX: if a change of an existing address failed, keep the entry
1310 * anyway.
1311 */
1312 if (hostIsNew)
1313 in6_unlink_ifa(ia, ifp);
1314 return (error);
1315
1316 cleanup:
1317 in6_purgeaddr(&ia->ia_ifa);
1318 return error;
1319 }
1320
1321 void
1322 in6_purgeaddr(struct ifaddr *ifa)
1323 {
1324 struct ifnet *ifp = ifa->ifa_ifp;
1325 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1326 char ip6buf[INET6_ADDRSTRLEN];
1327 struct in6_multi_mship *imm;
1328
1329 /* stop DAD processing */
1330 nd6_dad_stop(ifa);
1331
1332 /*
1333 * delete route to the destination of the address being purged.
1334 * The interface must be p2p or loopback in this case.
1335 */
1336 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1337 int e;
1338
1339 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1340 != 0) {
1341 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1342 "a route to the p2p destination: %s on %s, "
1343 "errno=%d\n",
1344 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1345 if_name(ifp), e);
1346 /* proceed anyway... */
1347 } else
1348 ia->ia_flags &= ~IFA_ROUTE;
1349 }
1350
1351 /* Remove ownaddr's loopback rtentry, if it exists. */
1352 in6_ifremloop(&(ia->ia_ifa));
1353
1354 /*
1355 * leave from multicast groups we have joined for the interface
1356 */
1357 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1358 LIST_REMOVE(imm, i6mm_chain);
1359 in6_leavegroup(imm);
1360 }
1361
1362 in6_unlink_ifa(ia, ifp);
1363 }
1364
1365 static void
1366 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1367 {
1368 struct in6_ifaddr *oia;
1369 int s = splnet();
1370
1371 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1372
1373 oia = ia;
1374 if (oia == (ia = in6_ifaddr))
1375 in6_ifaddr = ia->ia_next;
1376 else {
1377 while (ia->ia_next && (ia->ia_next != oia))
1378 ia = ia->ia_next;
1379 if (ia->ia_next)
1380 ia->ia_next = oia->ia_next;
1381 else {
1382 /* search failed */
1383 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1384 }
1385 }
1386
1387 /*
1388 * Release the reference to the base prefix. There should be a
1389 * positive reference.
1390 */
1391 if (oia->ia6_ndpr == NULL) {
1392 nd6log((LOG_NOTICE,
1393 "in6_unlink_ifa: autoconf'ed address "
1394 "%p has no prefix\n", oia));
1395 } else {
1396 oia->ia6_ndpr->ndpr_refcnt--;
1397 oia->ia6_ndpr = NULL;
1398 }
1399
1400 /*
1401 * Also, if the address being removed is autoconf'ed, call
1402 * pfxlist_onlink_check() since the release might affect the status of
1403 * other (detached) addresses.
1404 */
1405 if ((oia->ia6_flags & IN6_IFF_AUTOCONF)) {
1406 pfxlist_onlink_check();
1407 }
1408
1409 /*
1410 * release another refcnt for the link from in6_ifaddr.
1411 * Note that we should decrement the refcnt at least once for all *BSD.
1412 */
1413 IFAFREE(&oia->ia_ifa);
1414
1415 splx(s);
1416 }
1417
1418 void
1419 in6_purgeif(struct ifnet *ifp)
1420 {
1421 struct ifaddr *ifa, *nifa;
1422
1423 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
1424 nifa = TAILQ_NEXT(ifa, ifa_list);
1425 if (ifa->ifa_addr->sa_family != AF_INET6)
1426 continue;
1427 in6_purgeaddr(ifa);
1428 }
1429
1430 in6_ifdetach(ifp);
1431 }
1432
1433 /*
1434 * SIOC[GAD]LIFADDR.
1435 * SIOCGLIFADDR: get first address. (?)
1436 * SIOCGLIFADDR with IFLR_PREFIX:
1437 * get first address that matches the specified prefix.
1438 * SIOCALIFADDR: add the specified address.
1439 * SIOCALIFADDR with IFLR_PREFIX:
1440 * add the specified prefix, filling hostid part from
1441 * the first link-local address. prefixlen must be <= 64.
1442 * SIOCDLIFADDR: delete the specified address.
1443 * SIOCDLIFADDR with IFLR_PREFIX:
1444 * delete the first address that matches the specified prefix.
1445 * return values:
1446 * EINVAL on invalid parameters
1447 * EADDRNOTAVAIL on prefix match failed/specified address not found
1448 * other values may be returned from in6_ioctl()
1449 *
1450 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1451 * this is to accomodate address naming scheme other than RFC2374,
1452 * in the future.
1453 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1454 * address encoding scheme. (see figure on page 8)
1455 */
1456 static int
1457 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1458 struct ifnet *ifp, struct thread *td)
1459 {
1460 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1461 struct ifaddr *ifa;
1462 struct sockaddr *sa;
1463
1464 /* sanity checks */
1465 if (!data || !ifp) {
1466 panic("invalid argument to in6_lifaddr_ioctl");
1467 /* NOTREACHED */
1468 }
1469
1470 switch (cmd) {
1471 case SIOCGLIFADDR:
1472 /* address must be specified on GET with IFLR_PREFIX */
1473 if ((iflr->flags & IFLR_PREFIX) == 0)
1474 break;
1475 /* FALLTHROUGH */
1476 case SIOCALIFADDR:
1477 case SIOCDLIFADDR:
1478 /* address must be specified on ADD and DELETE */
1479 sa = (struct sockaddr *)&iflr->addr;
1480 if (sa->sa_family != AF_INET6)
1481 return EINVAL;
1482 if (sa->sa_len != sizeof(struct sockaddr_in6))
1483 return EINVAL;
1484 /* XXX need improvement */
1485 sa = (struct sockaddr *)&iflr->dstaddr;
1486 if (sa->sa_family && sa->sa_family != AF_INET6)
1487 return EINVAL;
1488 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1489 return EINVAL;
1490 break;
1491 default: /* shouldn't happen */
1492 #if 0
1493 panic("invalid cmd to in6_lifaddr_ioctl");
1494 /* NOTREACHED */
1495 #else
1496 return EOPNOTSUPP;
1497 #endif
1498 }
1499 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1500 return EINVAL;
1501
1502 switch (cmd) {
1503 case SIOCALIFADDR:
1504 {
1505 struct in6_aliasreq ifra;
1506 struct in6_addr *hostid = NULL;
1507 int prefixlen;
1508
1509 if ((iflr->flags & IFLR_PREFIX) != 0) {
1510 struct sockaddr_in6 *sin6;
1511
1512 /*
1513 * hostid is to fill in the hostid part of the
1514 * address. hostid points to the first link-local
1515 * address attached to the interface.
1516 */
1517 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1518 if (!ifa)
1519 return EADDRNOTAVAIL;
1520 hostid = IFA_IN6(ifa);
1521
1522 /* prefixlen must be <= 64. */
1523 if (64 < iflr->prefixlen)
1524 return EINVAL;
1525 prefixlen = iflr->prefixlen;
1526
1527 /* hostid part must be zero. */
1528 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1529 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1530 sin6->sin6_addr.s6_addr32[3] != 0) {
1531 return EINVAL;
1532 }
1533 } else
1534 prefixlen = iflr->prefixlen;
1535
1536 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1537 bzero(&ifra, sizeof(ifra));
1538 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1539
1540 bcopy(&iflr->addr, &ifra.ifra_addr,
1541 ((struct sockaddr *)&iflr->addr)->sa_len);
1542 if (hostid) {
1543 /* fill in hostid part */
1544 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1545 hostid->s6_addr32[2];
1546 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1547 hostid->s6_addr32[3];
1548 }
1549
1550 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1551 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1552 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1553 if (hostid) {
1554 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1555 hostid->s6_addr32[2];
1556 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1557 hostid->s6_addr32[3];
1558 }
1559 }
1560
1561 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1562 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1563
1564 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1565 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1566 }
1567 case SIOCGLIFADDR:
1568 case SIOCDLIFADDR:
1569 {
1570 struct in6_ifaddr *ia;
1571 struct in6_addr mask, candidate, match;
1572 struct sockaddr_in6 *sin6;
1573 int cmp;
1574
1575 bzero(&mask, sizeof(mask));
1576 if (iflr->flags & IFLR_PREFIX) {
1577 /* lookup a prefix rather than address. */
1578 in6_prefixlen2mask(&mask, iflr->prefixlen);
1579
1580 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1581 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1582 match.s6_addr32[0] &= mask.s6_addr32[0];
1583 match.s6_addr32[1] &= mask.s6_addr32[1];
1584 match.s6_addr32[2] &= mask.s6_addr32[2];
1585 match.s6_addr32[3] &= mask.s6_addr32[3];
1586
1587 /* if you set extra bits, that's wrong */
1588 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1589 return EINVAL;
1590
1591 cmp = 1;
1592 } else {
1593 if (cmd == SIOCGLIFADDR) {
1594 /* on getting an address, take the 1st match */
1595 cmp = 0; /* XXX */
1596 } else {
1597 /* on deleting an address, do exact match */
1598 in6_prefixlen2mask(&mask, 128);
1599 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1600 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1601
1602 cmp = 1;
1603 }
1604 }
1605
1606 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1607 if (ifa->ifa_addr->sa_family != AF_INET6)
1608 continue;
1609 if (!cmp)
1610 break;
1611
1612 /*
1613 * XXX: this is adhoc, but is necessary to allow
1614 * a user to specify fe80::/64 (not /10) for a
1615 * link-local address.
1616 */
1617 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1618 in6_clearscope(&candidate);
1619 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1620 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1621 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1622 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1623 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1624 break;
1625 }
1626 if (!ifa)
1627 return EADDRNOTAVAIL;
1628 ia = ifa2ia6(ifa);
1629
1630 if (cmd == SIOCGLIFADDR) {
1631 int error;
1632
1633 /* fill in the if_laddrreq structure */
1634 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1635 error = sa6_recoverscope(
1636 (struct sockaddr_in6 *)&iflr->addr);
1637 if (error != 0)
1638 return (error);
1639
1640 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1641 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1642 ia->ia_dstaddr.sin6_len);
1643 error = sa6_recoverscope(
1644 (struct sockaddr_in6 *)&iflr->dstaddr);
1645 if (error != 0)
1646 return (error);
1647 } else
1648 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1649
1650 iflr->prefixlen =
1651 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1652
1653 iflr->flags = ia->ia6_flags; /* XXX */
1654
1655 return 0;
1656 } else {
1657 struct in6_aliasreq ifra;
1658
1659 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1660 bzero(&ifra, sizeof(ifra));
1661 bcopy(iflr->iflr_name, ifra.ifra_name,
1662 sizeof(ifra.ifra_name));
1663
1664 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1665 ia->ia_addr.sin6_len);
1666 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1667 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1668 ia->ia_dstaddr.sin6_len);
1669 } else {
1670 bzero(&ifra.ifra_dstaddr,
1671 sizeof(ifra.ifra_dstaddr));
1672 }
1673 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1674 ia->ia_prefixmask.sin6_len);
1675
1676 ifra.ifra_flags = ia->ia6_flags;
1677 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1678 ifp, td);
1679 }
1680 }
1681 }
1682
1683 return EOPNOTSUPP; /* just for safety */
1684 }
1685
1686 /*
1687 * Initialize an interface's intetnet6 address
1688 * and routing table entry.
1689 */
1690 static int
1691 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1692 struct sockaddr_in6 *sin6, int newhost)
1693 {
1694 int error = 0, plen, ifacount = 0;
1695 int s = splimp();
1696 struct ifaddr *ifa;
1697
1698 /*
1699 * Give the interface a chance to initialize
1700 * if this is its first address,
1701 * and to validate the address if necessary.
1702 */
1703 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1704 if (ifa->ifa_addr->sa_family != AF_INET6)
1705 continue;
1706 ifacount++;
1707 }
1708
1709 ia->ia_addr = *sin6;
1710
1711 if (ifacount <= 1 && ifp->if_ioctl) {
1712 IFF_LOCKGIANT(ifp);
1713 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1714 IFF_UNLOCKGIANT(ifp);
1715 if (error) {
1716 splx(s);
1717 return (error);
1718 }
1719 }
1720 splx(s);
1721
1722 ia->ia_ifa.ifa_metric = ifp->if_metric;
1723
1724 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1725
1726 if (newhost) {
1727 /*
1728 * set the rtrequest function to create llinfo. It also
1729 * adjust outgoing interface of the route for the local
1730 * address when called via in6_ifaddloop() below.
1731 */
1732 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1733 }
1734
1735 /*
1736 * Special case:
1737 * If a new destination address is specified for a point-to-point
1738 * interface, install a route to the destination as an interface
1739 * direct route. In addition, if the link is expected to have neighbor
1740 * cache entries, specify RTF_LLINFO so that a cache entry for the
1741 * destination address will be created.
1742 * created
1743 * XXX: the logic below rejects assigning multiple addresses on a p2p
1744 * interface that share the same destination.
1745 */
1746 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1747 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1748 ia->ia_dstaddr.sin6_family == AF_INET6) {
1749 int rtflags = RTF_UP | RTF_HOST;
1750 struct rtentry *rt = NULL, **rtp = NULL;
1751
1752 if (nd6_need_cache(ifp) != 0) {
1753 rtflags |= RTF_LLINFO;
1754 rtp = &rt;
1755 }
1756
1757 error = rtrequest(RTM_ADD,
1758 (struct sockaddr *)&ia->ia_dstaddr,
1759 (struct sockaddr *)&ia->ia_addr,
1760 (struct sockaddr *)&ia->ia_prefixmask,
1761 ia->ia_flags | rtflags, rtp);
1762 if (error != 0)
1763 return (error);
1764 if (rt != NULL) {
1765 struct llinfo_nd6 *ln;
1766
1767 RT_LOCK(rt);
1768 ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1769 if (ln != NULL) {
1770 /*
1771 * Set the state to STALE because we don't
1772 * have to perform address resolution on this
1773 * link.
1774 */
1775 ln->ln_state = ND6_LLINFO_STALE;
1776 }
1777 RT_REMREF(rt);
1778 RT_UNLOCK(rt);
1779 }
1780 ia->ia_flags |= IFA_ROUTE;
1781 }
1782 if (plen < 128) {
1783 /*
1784 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1785 */
1786 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1787 }
1788
1789 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1790 if (newhost)
1791 in6_ifaddloop(&(ia->ia_ifa));
1792
1793 return (error);
1794 }
1795
1796 struct in6_multi_mship *
1797 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr,
1798 int *errorp, int delay)
1799 {
1800 struct in6_multi_mship *imm;
1801
1802 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
1803 if (!imm) {
1804 *errorp = ENOBUFS;
1805 return NULL;
1806 }
1807 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, delay);
1808 if (!imm->i6mm_maddr) {
1809 /* *errorp is alrady set */
1810 free(imm, M_IP6MADDR);
1811 return NULL;
1812 }
1813 return imm;
1814 }
1815
1816 int
1817 in6_leavegroup(struct in6_multi_mship *imm)
1818 {
1819
1820 if (imm->i6mm_maddr)
1821 in6_delmulti(imm->i6mm_maddr);
1822 free(imm, M_IP6MADDR);
1823 return 0;
1824 }
1825
1826 /*
1827 * Find an IPv6 interface link-local address specific to an interface.
1828 */
1829 struct in6_ifaddr *
1830 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1831 {
1832 struct ifaddr *ifa;
1833
1834 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
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(struct ifnet *ifp, struct in6_addr *addr)
1854 {
1855 struct ifaddr *ifa;
1856
1857 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1858 if (ifa->ifa_addr->sa_family != AF_INET6)
1859 continue;
1860 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1861 break;
1862 }
1863
1864 return ((struct in6_ifaddr *)ifa);
1865 }
1866
1867 /*
1868 * Convert IP6 address to printable (loggable) representation. Caller
1869 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1870 */
1871 static char digits[] = "0123456789abcdef";
1872 char *
1873 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1874 {
1875 int i;
1876 char *cp;
1877 const u_int16_t *a = (const u_int16_t *)addr;
1878 const u_int8_t *d;
1879 int dcolon = 0, zero = 0;
1880
1881 cp = ip6buf;
1882
1883 for (i = 0; i < 8; i++) {
1884 if (dcolon == 1) {
1885 if (*a == 0) {
1886 if (i == 7)
1887 *cp++ = ':';
1888 a++;
1889 continue;
1890 } else
1891 dcolon = 2;
1892 }
1893 if (*a == 0) {
1894 if (dcolon == 0 && *(a + 1) == 0) {
1895 if (i == 0)
1896 *cp++ = ':';
1897 *cp++ = ':';
1898 dcolon = 1;
1899 } else {
1900 *cp++ = '';
1901 *cp++ = ':';
1902 }
1903 a++;
1904 continue;
1905 }
1906 d = (const u_char *)a;
1907 /* Try to eliminate leading zeros in printout like in :0001. */
1908 zero = 1;
1909 *cp = digits[*d >> 4];
1910 if (*cp != '') {
1911 zero = 0;
1912 cp++;
1913 }
1914 *cp = digits[*d++ & 0xf];
1915 if (zero == 0 || (*cp != '')) {
1916 zero = 0;
1917 cp++;
1918 }
1919 *cp = digits[*d >> 4];
1920 if (zero == 0 || (*cp != '')) {
1921 zero = 0;
1922 cp++;
1923 }
1924 *cp++ = digits[*d & 0xf];
1925 *cp++ = ':';
1926 a++;
1927 }
1928 *--cp = '\0';
1929 return (ip6buf);
1930 }
1931
1932 int
1933 in6_localaddr(struct in6_addr *in6)
1934 {
1935 struct in6_ifaddr *ia;
1936
1937 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1938 return 1;
1939
1940 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1941 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1942 &ia->ia_prefixmask.sin6_addr)) {
1943 return 1;
1944 }
1945 }
1946
1947 return (0);
1948 }
1949
1950 int
1951 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1952 {
1953 struct in6_ifaddr *ia;
1954
1955 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1956 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1957 &sa6->sin6_addr) &&
1958 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1959 return (1); /* true */
1960
1961 /* XXX: do we still have to go thru the rest of the list? */
1962 }
1963
1964 return (0); /* false */
1965 }
1966
1967 /*
1968 * return length of part which dst and src are equal
1969 * hard coding...
1970 */
1971 int
1972 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1973 {
1974 int match = 0;
1975 u_char *s = (u_char *)src, *d = (u_char *)dst;
1976 u_char *lim = s + 16, r;
1977
1978 while (s < lim)
1979 if ((r = (*d++ ^ *s++)) != 0) {
1980 while (r < 128) {
1981 match++;
1982 r <<= 1;
1983 }
1984 break;
1985 } else
1986 match += 8;
1987 return match;
1988 }
1989
1990 /* XXX: to be scope conscious */
1991 int
1992 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1993 {
1994 int bytelen, bitlen;
1995
1996 /* sanity check */
1997 if (0 > len || len > 128) {
1998 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1999 len);
2000 return (0);
2001 }
2002
2003 bytelen = len / 8;
2004 bitlen = len % 8;
2005
2006 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2007 return (0);
2008 if (bitlen != 0 &&
2009 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2010 p2->s6_addr[bytelen] >> (8 - bitlen))
2011 return (0);
2012
2013 return (1);
2014 }
2015
2016 void
2017 in6_prefixlen2mask(struct in6_addr *maskp, 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(struct ifnet *ifp, struct in6_addr *dst)
2044 {
2045 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2046 struct ifaddr *ifa;
2047 struct in6_ifaddr *besta = 0;
2048 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2049
2050 dep[0] = dep[1] = NULL;
2051
2052 /*
2053 * We first look for addresses in the same scope.
2054 * If there is one, return it.
2055 * If two or more, return one which matches the dst longest.
2056 * If none, return one of global addresses assigned other ifs.
2057 */
2058 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2059 if (ifa->ifa_addr->sa_family != AF_INET6)
2060 continue;
2061 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2062 continue; /* XXX: is there any case to allow anycast? */
2063 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2064 continue; /* don't use this interface */
2065 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2066 continue;
2067 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2068 if (ip6_use_deprecated)
2069 dep[0] = (struct in6_ifaddr *)ifa;
2070 continue;
2071 }
2072
2073 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2074 /*
2075 * call in6_matchlen() as few as possible
2076 */
2077 if (besta) {
2078 if (blen == -1)
2079 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2080 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2081 if (tlen > blen) {
2082 blen = tlen;
2083 besta = (struct in6_ifaddr *)ifa;
2084 }
2085 } else
2086 besta = (struct in6_ifaddr *)ifa;
2087 }
2088 }
2089 if (besta)
2090 return (besta);
2091
2092 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2093 if (ifa->ifa_addr->sa_family != AF_INET6)
2094 continue;
2095 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2096 continue; /* XXX: is there any case to allow anycast? */
2097 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2098 continue; /* don't use this interface */
2099 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2100 continue;
2101 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2102 if (ip6_use_deprecated)
2103 dep[1] = (struct in6_ifaddr *)ifa;
2104 continue;
2105 }
2106
2107 return (struct in6_ifaddr *)ifa;
2108 }
2109
2110 /* use the last-resort values, that are, deprecated addresses */
2111 if (dep[0])
2112 return dep[0];
2113 if (dep[1])
2114 return dep[1];
2115
2116 return NULL;
2117 }
2118
2119 /*
2120 * perform DAD when interface becomes IFF_UP.
2121 */
2122 void
2123 in6_if_up(struct ifnet *ifp)
2124 {
2125 struct ifaddr *ifa;
2126 struct in6_ifaddr *ia;
2127
2128 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2129 if (ifa->ifa_addr->sa_family != AF_INET6)
2130 continue;
2131 ia = (struct in6_ifaddr *)ifa;
2132 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2133 /*
2134 * The TENTATIVE flag was likely set by hand
2135 * beforehand, implicitly indicating the need for DAD.
2136 * We may be able to skip the random delay in this
2137 * case, but we impose delays just in case.
2138 */
2139 nd6_dad_start(ifa,
2140 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2141 }
2142 }
2143
2144 /*
2145 * special cases, like 6to4, are handled in in6_ifattach
2146 */
2147 in6_ifattach(ifp, NULL);
2148 }
2149
2150 int
2151 in6if_do_dad(struct ifnet *ifp)
2152 {
2153 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2154 return (0);
2155
2156 switch (ifp->if_type) {
2157 #ifdef IFT_DUMMY
2158 case IFT_DUMMY:
2159 #endif
2160 case IFT_FAITH:
2161 /*
2162 * These interfaces do not have the IFF_LOOPBACK flag,
2163 * but loop packets back. We do not have to do DAD on such
2164 * interfaces. We should even omit it, because loop-backed
2165 * NS would confuse the DAD procedure.
2166 */
2167 return (0);
2168 default:
2169 /*
2170 * Our DAD routine requires the interface up and running.
2171 * However, some interfaces can be up before the RUNNING
2172 * status. Additionaly, users may try to assign addresses
2173 * before the interface becomes up (or running).
2174 * We simply skip DAD in such a case as a work around.
2175 * XXX: we should rather mark "tentative" on such addresses,
2176 * and do DAD after the interface becomes ready.
2177 */
2178 if (!((ifp->if_flags & IFF_UP) &&
2179 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2180 return (0);
2181
2182 return (1);
2183 }
2184 }
2185
2186 /*
2187 * Calculate max IPv6 MTU through all the interfaces and store it
2188 * to in6_maxmtu.
2189 */
2190 void
2191 in6_setmaxmtu(void)
2192 {
2193 unsigned long maxmtu = 0;
2194 struct ifnet *ifp;
2195
2196 IFNET_RLOCK();
2197 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
2198 /* this function can be called during ifnet initialization */
2199 if (!ifp->if_afdata[AF_INET6])
2200 continue;
2201 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2202 IN6_LINKMTU(ifp) > maxmtu)
2203 maxmtu = IN6_LINKMTU(ifp);
2204 }
2205 IFNET_RUNLOCK();
2206 if (maxmtu) /* update only when maxmtu is positive */
2207 in6_maxmtu = maxmtu;
2208 }
2209
2210 /*
2211 * Provide the length of interface identifiers to be used for the link attached
2212 * to the given interface. The length should be defined in "IPv6 over
2213 * xxx-link" document. Note that address architecture might also define
2214 * the length for a particular set of address prefixes, regardless of the
2215 * link type. As clarified in rfc2462bis, those two definitions should be
2216 * consistent, and those really are as of August 2004.
2217 */
2218 int
2219 in6_if2idlen(struct ifnet *ifp)
2220 {
2221 switch (ifp->if_type) {
2222 case IFT_ETHER: /* RFC2464 */
2223 #ifdef IFT_PROPVIRTUAL
2224 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2225 #endif
2226 #ifdef IFT_L2VLAN
2227 case IFT_L2VLAN: /* ditto */
2228 #endif
2229 #ifdef IFT_IEEE80211
2230 case IFT_IEEE80211: /* ditto */
2231 #endif
2232 #ifdef IFT_MIP
2233 case IFT_MIP: /* ditto */
2234 #endif
2235 return (64);
2236 case IFT_FDDI: /* RFC2467 */
2237 return (64);
2238 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2239 return (64);
2240 case IFT_PPP: /* RFC2472 */
2241 return (64);
2242 case IFT_ARCNET: /* RFC2497 */
2243 return (64);
2244 case IFT_FRELAY: /* RFC2590 */
2245 return (64);
2246 case IFT_IEEE1394: /* RFC3146 */
2247 return (64);
2248 case IFT_GIF:
2249 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2250 case IFT_LOOP:
2251 return (64); /* XXX: is this really correct? */
2252 default:
2253 /*
2254 * Unknown link type:
2255 * It might be controversial to use the today's common constant
2256 * of 64 for these cases unconditionally. For full compliance,
2257 * we should return an error in this case. On the other hand,
2258 * if we simply miss the standard for the link type or a new
2259 * standard is defined for a new link type, the IFID length
2260 * is very likely to be the common constant. As a compromise,
2261 * we always use the constant, but make an explicit notice
2262 * indicating the "unknown" case.
2263 */
2264 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2265 return (64);
2266 }
2267 }
2268
2269 void *
2270 in6_domifattach(struct ifnet *ifp)
2271 {
2272 struct in6_ifextra *ext;
2273
2274 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2275 bzero(ext, sizeof(*ext));
2276
2277 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2278 M_IFADDR, M_WAITOK);
2279 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2280
2281 ext->icmp6_ifstat =
2282 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2283 M_IFADDR, M_WAITOK);
2284 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2285
2286 ext->nd_ifinfo = nd6_ifattach(ifp);
2287 ext->scope6_id = scope6_ifattach(ifp);
2288 return ext;
2289 }
2290
2291 void
2292 in6_domifdetach(struct ifnet *ifp, void *aux)
2293 {
2294 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2295
2296 scope6_ifdetach(ext->scope6_id);
2297 nd6_ifdetach(ext->nd_ifinfo);
2298 free(ext->in6_ifstat, M_IFADDR);
2299 free(ext->icmp6_ifstat, M_IFADDR);
2300 free(ext, M_IFADDR);
2301 }
2302
2303 /*
2304 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2305 * v4 mapped addr or v4 compat addr
2306 */
2307 void
2308 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2309 {
2310
2311 bzero(sin, sizeof(*sin));
2312 sin->sin_len = sizeof(struct sockaddr_in);
2313 sin->sin_family = AF_INET;
2314 sin->sin_port = sin6->sin6_port;
2315 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2316 }
2317
2318 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2319 void
2320 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2321 {
2322 bzero(sin6, sizeof(*sin6));
2323 sin6->sin6_len = sizeof(struct sockaddr_in6);
2324 sin6->sin6_family = AF_INET6;
2325 sin6->sin6_port = sin->sin_port;
2326 sin6->sin6_addr.s6_addr32[0] = 0;
2327 sin6->sin6_addr.s6_addr32[1] = 0;
2328 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2329 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2330 }
2331
2332 /* Convert sockaddr_in6 into sockaddr_in. */
2333 void
2334 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2335 {
2336 struct sockaddr_in *sin_p;
2337 struct sockaddr_in6 sin6;
2338
2339 /*
2340 * Save original sockaddr_in6 addr and convert it
2341 * to sockaddr_in.
2342 */
2343 sin6 = *(struct sockaddr_in6 *)nam;
2344 sin_p = (struct sockaddr_in *)nam;
2345 in6_sin6_2_sin(sin_p, &sin6);
2346 }
2347
2348 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2349 void
2350 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2351 {
2352 struct sockaddr_in *sin_p;
2353 struct sockaddr_in6 *sin6_p;
2354
2355 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
2356 M_WAITOK);
2357 sin_p = (struct sockaddr_in *)*nam;
2358 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2359 FREE(*nam, M_SONAME);
2360 *nam = (struct sockaddr *)sin6_p;
2361 }
Cache object: 0f0bfdee729b66d9b6d4d5a614daa1f5
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