FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /* $FreeBSD: releng/5.3/sys/netinet6/in6.c 136588 2004-10-16 08:43:07Z cvs2svn $ */
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_IPMADDR, "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 if (nrt) {
170 RT_LOCK(nrt);
171 /*
172 * Make sure rt_ifa be equal to IFA, the second argument of
173 * the function. We need this because when we refer to
174 * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa
175 * points to the address instead of the loopback address.
176 */
177 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) {
178 IFAFREE(nrt->rt_ifa);
179 IFAREF(ifa);
180 nrt->rt_ifa = ifa;
181 }
182
183 /*
184 * Report the addition/removal of the address to the routing
185 * socket.
186 *
187 * XXX: since we called rtinit for a p2p interface with a
188 * destination, we end up reporting twice in such a case.
189 * Should we rather omit the second report?
190 */
191 rt_newaddrmsg(cmd, ifa, e, nrt);
192 if (cmd == RTM_DELETE) {
193 rtfree(nrt);
194 } else {
195 /* the cmd must be RTM_ADD here */
196 RT_REMREF(nrt);
197 RT_UNLOCK(nrt);
198 }
199 }
200 }
201
202 /*
203 * Add ownaddr as loopback rtentry. We previously add the route only if
204 * necessary (ex. on a p2p link). However, since we now manage addresses
205 * separately from prefixes, we should always add the route. We can't
206 * rely on the cloning mechanism from the corresponding interface route
207 * any more.
208 */
209 static void
210 in6_ifaddloop(struct ifaddr *ifa)
211 {
212 struct rtentry *rt;
213 int need_loop;
214
215 /* If there is no loopback entry, allocate one. */
216 rt = rtalloc1(ifa->ifa_addr, 0, 0);
217 need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
218 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0);
219 if (rt)
220 rtfree(rt);
221 if (need_loop)
222 in6_ifloop_request(RTM_ADD, ifa);
223 }
224
225 /*
226 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
227 * if it exists.
228 */
229 static void
230 in6_ifremloop(struct ifaddr *ifa)
231 {
232 struct in6_ifaddr *ia;
233 struct rtentry *rt;
234 int ia_count = 0;
235
236 /*
237 * Some of BSD variants do not remove cloned routes
238 * from an interface direct route, when removing the direct route
239 * (see comments in net/net_osdep.h). Even for variants that do remove
240 * cloned routes, they could fail to remove the cloned routes when
241 * we handle multple addresses that share a common prefix.
242 * So, we should remove the route corresponding to the deleted address
243 * regardless of the result of in6_is_ifloop_auto().
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(rt);
274 in6_ifloop_request(RTM_DELETE, ifa);
275 } else
276 RT_UNLOCK(rt);
277 }
278 }
279 }
280
281 int
282 in6_mask2len(mask, lim0)
283 struct in6_addr *mask;
284 u_char *lim0;
285 {
286 int x = 0, y;
287 u_char *lim = lim0, *p;
288
289 /* ignore the scope_id part */
290 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
291 lim = (u_char *)mask + sizeof(*mask);
292 for (p = (u_char *)mask; p < lim; x++, p++) {
293 if (*p != 0xff)
294 break;
295 }
296 y = 0;
297 if (p < lim) {
298 for (y = 0; y < 8; y++) {
299 if ((*p & (0x80 >> y)) == 0)
300 break;
301 }
302 }
303
304 /*
305 * when the limit pointer is given, do a stricter check on the
306 * remaining bits.
307 */
308 if (p < lim) {
309 if (y != 0 && (*p & (0x00ff >> y)) != 0)
310 return (-1);
311 for (p = p + 1; p < lim; p++)
312 if (*p != 0)
313 return (-1);
314 }
315
316 return x * 8 + y;
317 }
318
319 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
320 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
321
322 int
323 in6_control(so, cmd, data, ifp, td)
324 struct socket *so;
325 u_long cmd;
326 caddr_t data;
327 struct ifnet *ifp;
328 struct thread *td;
329 {
330 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
331 struct in6_ifaddr *ia = NULL;
332 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
333 int privileged;
334
335 privileged = 0;
336 if (td == NULL || !suser(td))
337 privileged++;
338
339 switch (cmd) {
340 case SIOCGETSGCNT_IN6:
341 case SIOCGETMIFCNT_IN6:
342 return (mrt6_ioctl(cmd, data));
343 }
344
345 switch(cmd) {
346 case SIOCAADDRCTL_POLICY:
347 case SIOCDADDRCTL_POLICY:
348 if (!privileged)
349 return (EPERM);
350 return (in6_src_ioctl(cmd, data));
351 }
352
353 if (ifp == NULL)
354 return (EOPNOTSUPP);
355
356 switch (cmd) {
357 case SIOCSNDFLUSH_IN6:
358 case SIOCSPFXFLUSH_IN6:
359 case SIOCSRTRFLUSH_IN6:
360 case SIOCSDEFIFACE_IN6:
361 case SIOCSIFINFO_FLAGS:
362 if (!privileged)
363 return (EPERM);
364 /* FALLTHROUGH */
365 case OSIOCGIFINFO_IN6:
366 case SIOCGIFINFO_IN6:
367 case SIOCGDRLST_IN6:
368 case SIOCGPRLST_IN6:
369 case SIOCGNBRINFO_IN6:
370 case SIOCGDEFIFACE_IN6:
371 return (nd6_ioctl(cmd, data, ifp));
372 }
373
374 switch (cmd) {
375 case SIOCSIFPREFIX_IN6:
376 case SIOCDIFPREFIX_IN6:
377 case SIOCAIFPREFIX_IN6:
378 case SIOCCIFPREFIX_IN6:
379 case SIOCSGIFPREFIX_IN6:
380 case SIOCGIFPREFIX_IN6:
381 log(LOG_NOTICE,
382 "prefix ioctls are now invalidated. "
383 "please use ifconfig.\n");
384 return (EOPNOTSUPP);
385 }
386
387 switch (cmd) {
388 case SIOCSSCOPE6:
389 if (!privileged)
390 return (EPERM);
391 return (scope6_set(ifp,
392 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
393 case SIOCGSCOPE6:
394 return (scope6_get(ifp,
395 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
396 case SIOCGSCOPE6DEF:
397 return (scope6_get_default((struct scope6_id *)
398 ifr->ifr_ifru.ifru_scope_id));
399 }
400
401 switch (cmd) {
402 case SIOCALIFADDR:
403 case SIOCDLIFADDR:
404 if (!privileged)
405 return (EPERM);
406 /* FALLTHROUGH */
407 case SIOCGLIFADDR:
408 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
409 }
410
411 /*
412 * Find address for this interface, if it exists.
413 */
414 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */
415 struct sockaddr_in6 *sa6 =
416 (struct sockaddr_in6 *)&ifra->ifra_addr;
417
418 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
419 if (sa6->sin6_addr.s6_addr16[1] == 0) {
420 /* link ID is not embedded by the user */
421 sa6->sin6_addr.s6_addr16[1] =
422 htons(ifp->if_index);
423 } else if (sa6->sin6_addr.s6_addr16[1] !=
424 htons(ifp->if_index)) {
425 return (EINVAL); /* link ID contradicts */
426 }
427 if (sa6->sin6_scope_id) {
428 if (sa6->sin6_scope_id !=
429 (u_int32_t)ifp->if_index)
430 return (EINVAL);
431 sa6->sin6_scope_id = 0; /* XXX: good way? */
432 }
433 }
434 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
435 }
436
437 switch (cmd) {
438 case SIOCSIFADDR_IN6:
439 case SIOCSIFDSTADDR_IN6:
440 case SIOCSIFNETMASK_IN6:
441 /*
442 * Since IPv6 allows a node to assign multiple addresses
443 * on a single interface, SIOCSIFxxx ioctls are not suitable
444 * and should be unused.
445 */
446 /* we decided to obsolete this command (20000704) */
447 return (EINVAL);
448
449 case SIOCDIFADDR_IN6:
450 /*
451 * for IPv4, we look for existing in_ifaddr here to allow
452 * "ifconfig if0 delete" to remove first IPv4 address on the
453 * interface. For IPv6, as the spec allow multiple interface
454 * address from the day one, we consider "remove the first one"
455 * semantics to be not preferable.
456 */
457 if (ia == NULL)
458 return (EADDRNOTAVAIL);
459 /* FALLTHROUGH */
460 case SIOCAIFADDR_IN6:
461 /*
462 * We always require users to specify a valid IPv6 address for
463 * the corresponding operation.
464 */
465 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
466 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
467 return (EAFNOSUPPORT);
468 if (!privileged)
469 return (EPERM);
470
471 break;
472
473 case SIOCGIFADDR_IN6:
474 /* This interface is basically deprecated. use SIOCGIFCONF. */
475 /* FALLTHROUGH */
476 case SIOCGIFAFLAG_IN6:
477 case SIOCGIFNETMASK_IN6:
478 case SIOCGIFDSTADDR_IN6:
479 case SIOCGIFALIFETIME_IN6:
480 /* must think again about its semantics */
481 if (ia == NULL)
482 return (EADDRNOTAVAIL);
483 break;
484 case SIOCSIFALIFETIME_IN6:
485 {
486 struct in6_addrlifetime *lt;
487
488 if (!privileged)
489 return (EPERM);
490 if (ia == NULL)
491 return (EADDRNOTAVAIL);
492 /* sanity for overflow - beware unsigned */
493 lt = &ifr->ifr_ifru.ifru_lifetime;
494 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
495 lt->ia6t_vltime + time_second < time_second) {
496 return EINVAL;
497 }
498 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
499 lt->ia6t_pltime + time_second < time_second) {
500 return EINVAL;
501 }
502 break;
503 }
504 }
505
506 switch (cmd) {
507
508 case SIOCGIFADDR_IN6:
509 ifr->ifr_addr = ia->ia_addr;
510 break;
511
512 case SIOCGIFDSTADDR_IN6:
513 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
514 return (EINVAL);
515 /*
516 * XXX: should we check if ifa_dstaddr is NULL and return
517 * an error?
518 */
519 ifr->ifr_dstaddr = ia->ia_dstaddr;
520 break;
521
522 case SIOCGIFNETMASK_IN6:
523 ifr->ifr_addr = ia->ia_prefixmask;
524 break;
525
526 case SIOCGIFAFLAG_IN6:
527 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
528 break;
529
530 case SIOCGIFSTAT_IN6:
531 if (ifp == NULL)
532 return EINVAL;
533 bzero(&ifr->ifr_ifru.ifru_stat,
534 sizeof(ifr->ifr_ifru.ifru_stat));
535 ifr->ifr_ifru.ifru_stat =
536 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
537 break;
538
539 case SIOCGIFSTAT_ICMP6:
540 if (ifp == NULL)
541 return EINVAL;
542 bzero(&ifr->ifr_ifru.ifru_stat,
543 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
544 ifr->ifr_ifru.ifru_icmp6stat =
545 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
546 break;
547
548 case SIOCGIFALIFETIME_IN6:
549 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
550 break;
551
552 case SIOCSIFALIFETIME_IN6:
553 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
554 /* for sanity */
555 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
556 ia->ia6_lifetime.ia6t_expire =
557 time_second + ia->ia6_lifetime.ia6t_vltime;
558 } else
559 ia->ia6_lifetime.ia6t_expire = 0;
560 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
561 ia->ia6_lifetime.ia6t_preferred =
562 time_second + ia->ia6_lifetime.ia6t_pltime;
563 } else
564 ia->ia6_lifetime.ia6t_preferred = 0;
565 break;
566
567 case SIOCAIFADDR_IN6:
568 {
569 int i, error = 0;
570 struct nd_prefix pr0, *pr;
571
572 /*
573 * first, make or update the interface address structure,
574 * and link it to the list.
575 */
576 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
577 return (error);
578
579 /*
580 * then, make the prefix on-link on the interface.
581 * XXX: we'd rather create the prefix before the address, but
582 * we need at least one address to install the corresponding
583 * interface route, so we configure the address first.
584 */
585
586 /*
587 * convert mask to prefix length (prefixmask has already
588 * been validated in in6_update_ifa().
589 */
590 bzero(&pr0, sizeof(pr0));
591 pr0.ndpr_ifp = ifp;
592 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
593 NULL);
594 if (pr0.ndpr_plen == 128) {
595 break; /* we don't need to install a host route. */
596 }
597 pr0.ndpr_prefix = ifra->ifra_addr;
598 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
599 /* apply the mask for safety. */
600 for (i = 0; i < 4; i++) {
601 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
602 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
603 }
604 /*
605 * XXX: since we don't have an API to set prefix (not address)
606 * lifetimes, we just use the same lifetimes as addresses.
607 * The (temporarily) installed lifetimes can be overridden by
608 * later advertised RAs (when accept_rtadv is non 0), which is
609 * an intended behavior.
610 */
611 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
612 pr0.ndpr_raf_auto =
613 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
614 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
615 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
616
617 /* add the prefix if not yet. */
618 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
619 /*
620 * nd6_prelist_add will install the corresponding
621 * interface route.
622 */
623 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
624 return (error);
625 if (pr == NULL) {
626 log(LOG_ERR, "nd6_prelist_add succeeded but "
627 "no prefix\n");
628 return (EINVAL); /* XXX panic here? */
629 }
630 }
631 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
632 == NULL) {
633 /* XXX: this should not happen! */
634 log(LOG_ERR, "in6_control: addition succeeded, but"
635 " no ifaddr\n");
636 } else {
637 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
638 ia->ia6_ndpr == NULL) { /* new autoconfed addr */
639 ia->ia6_ndpr = pr;
640 pr->ndpr_refcnt++;
641
642 /*
643 * If this is the first autoconf address from
644 * the prefix, create a temporary address
645 * as well (when specified).
646 */
647 if (ip6_use_tempaddr &&
648 pr->ndpr_refcnt == 1) {
649 int e;
650 if ((e = in6_tmpifadd(ia, 1)) != 0) {
651 log(LOG_NOTICE, "in6_control: "
652 "failed to create a "
653 "temporary address, "
654 "errno=%d\n", e);
655 }
656 }
657 }
658
659 /*
660 * this might affect the status of autoconfigured
661 * addresses, that is, this address might make
662 * other addresses detached.
663 */
664 pfxlist_onlink_check();
665 }
666 if (error == 0 && ia)
667 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
668 break;
669 }
670
671 case SIOCDIFADDR_IN6:
672 {
673 int i = 0;
674 struct nd_prefix pr0, *pr;
675
676 /*
677 * If the address being deleted is the only one that owns
678 * the corresponding prefix, expire the prefix as well.
679 * XXX: theoretically, we don't have to worry about such
680 * relationship, since we separate the address management
681 * and the prefix management. We do this, however, to provide
682 * as much backward compatibility as possible in terms of
683 * the ioctl operation.
684 */
685 bzero(&pr0, sizeof(pr0));
686 pr0.ndpr_ifp = ifp;
687 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
688 NULL);
689 if (pr0.ndpr_plen == 128)
690 goto purgeaddr;
691 pr0.ndpr_prefix = ia->ia_addr;
692 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
693 for (i = 0; i < 4; i++) {
694 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
695 ia->ia_prefixmask.sin6_addr.s6_addr32[i];
696 }
697 /*
698 * The logic of the following condition is a bit complicated.
699 * We expire the prefix when
700 * 1. the address obeys autoconfiguration and it is the
701 * only owner of the associated prefix, or
702 * 2. the address does not obey autoconf and there is no
703 * other owner of the prefix.
704 */
705 if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
706 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
707 pr->ndpr_refcnt == 1) ||
708 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 &&
709 pr->ndpr_refcnt == 0))) {
710 pr->ndpr_expire = 1; /* XXX: just for expiration */
711 }
712
713 purgeaddr:
714 in6_purgeaddr(&ia->ia_ifa);
715 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
716 break;
717 }
718
719 default:
720 if (ifp == NULL || ifp->if_ioctl == 0)
721 return (EOPNOTSUPP);
722 return ((*ifp->if_ioctl)(ifp, cmd, data));
723 }
724
725 return (0);
726 }
727
728 /*
729 * Update parameters of an IPv6 interface address.
730 * If necessary, a new entry is created and linked into address chains.
731 * This function is separated from in6_control().
732 * XXX: should this be performed under splnet()?
733 */
734 int
735 in6_update_ifa(ifp, ifra, ia)
736 struct ifnet *ifp;
737 struct in6_aliasreq *ifra;
738 struct in6_ifaddr *ia;
739 {
740 int error = 0, hostIsNew = 0, plen = -1;
741 struct in6_ifaddr *oia;
742 struct sockaddr_in6 dst6;
743 struct in6_addrlifetime *lt;
744
745 /* Validate parameters */
746 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
747 return (EINVAL);
748
749 /*
750 * The destination address for a p2p link must have a family
751 * of AF_UNSPEC or AF_INET6.
752 */
753 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
754 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
755 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
756 return (EAFNOSUPPORT);
757 /*
758 * validate ifra_prefixmask. don't check sin6_family, netmask
759 * does not carry fields other than sin6_len.
760 */
761 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
762 return (EINVAL);
763 /*
764 * Because the IPv6 address architecture is classless, we require
765 * users to specify a (non 0) prefix length (mask) for a new address.
766 * We also require the prefix (when specified) mask is valid, and thus
767 * reject a non-consecutive mask.
768 */
769 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
770 return (EINVAL);
771 if (ifra->ifra_prefixmask.sin6_len != 0) {
772 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
773 (u_char *)&ifra->ifra_prefixmask +
774 ifra->ifra_prefixmask.sin6_len);
775 if (plen <= 0)
776 return (EINVAL);
777 } else {
778 /*
779 * In this case, ia must not be NULL. We just use its prefix
780 * length.
781 */
782 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
783 }
784 /*
785 * If the destination address on a p2p interface is specified,
786 * and the address is a scoped one, validate/set the scope
787 * zone identifier.
788 */
789 dst6 = ifra->ifra_dstaddr;
790 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
791 (dst6.sin6_family == AF_INET6)) {
792 u_int32_t zoneid;
793
794 if ((error = in6_recoverscope(&dst6,
795 &ifra->ifra_dstaddr.sin6_addr, ifp)) != 0)
796 return (error);
797 if (in6_addr2zoneid(ifp, &dst6.sin6_addr, &zoneid))
798 return (EINVAL);
799 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
800 dst6.sin6_scope_id = zoneid;
801 else if (dst6.sin6_scope_id != zoneid)
802 return (EINVAL); /* scope ID mismatch. */
803 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL))
804 != 0)
805 return (error);
806 dst6.sin6_scope_id = 0; /* XXX */
807 }
808 /*
809 * The destination address can be specified only for a p2p or a
810 * loopback interface. If specified, the corresponding prefix length
811 * must be 128.
812 */
813 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
814 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
815 /* XXX: noisy message */
816 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
817 "be specified for a p2p or a loopback IF only\n"));
818 return (EINVAL);
819 }
820 if (plen != 128) {
821 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
822 "be 128 when dstaddr is specified\n"));
823 return (EINVAL);
824 }
825 }
826 /* lifetime consistency check */
827 lt = &ifra->ifra_lifetime;
828 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
829 && lt->ia6t_vltime + time_second < time_second) {
830 return EINVAL;
831 }
832 if (lt->ia6t_vltime == 0) {
833 /*
834 * the following log might be noisy, but this is a typical
835 * configuration mistake or a tool's bug.
836 */
837 nd6log((LOG_INFO,
838 "in6_update_ifa: valid lifetime is 0 for %s\n",
839 ip6_sprintf(&ifra->ifra_addr.sin6_addr)));
840 }
841 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
842 && lt->ia6t_pltime + time_second < time_second) {
843 return EINVAL;
844 }
845
846 /*
847 * If this is a new address, allocate a new ifaddr and link it
848 * into chains.
849 */
850 if (ia == NULL) {
851 hostIsNew = 1;
852 /*
853 * When in6_update_ifa() is called in a process of a received
854 * RA, it is called under an interrupt context. So, we should
855 * call malloc with M_NOWAIT.
856 */
857 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
858 M_NOWAIT);
859 if (ia == NULL)
860 return (ENOBUFS);
861 bzero((caddr_t)ia, sizeof(*ia));
862 /* Initialize the address and masks */
863 IFA_LOCK_INIT(&ia->ia_ifa);
864 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
865 ia->ia_addr.sin6_family = AF_INET6;
866 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
867 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
868 /*
869 * XXX: some functions expect that ifa_dstaddr is not
870 * NULL for p2p interfaces.
871 */
872 ia->ia_ifa.ifa_dstaddr =
873 (struct sockaddr *)&ia->ia_dstaddr;
874 } else {
875 ia->ia_ifa.ifa_dstaddr = NULL;
876 }
877 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
878
879 ia->ia_ifp = ifp;
880 if ((oia = in6_ifaddr) != NULL) {
881 for ( ; oia->ia_next; oia = oia->ia_next)
882 continue;
883 oia->ia_next = ia;
884 } else
885 in6_ifaddr = ia;
886
887 ia->ia_ifa.ifa_refcnt = 1;
888 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
889 }
890
891 /* set prefix mask */
892 if (ifra->ifra_prefixmask.sin6_len) {
893 /*
894 * We prohibit changing the prefix length of an existing
895 * address, because
896 * + such an operation should be rare in IPv6, and
897 * + the operation would confuse prefix management.
898 */
899 if (ia->ia_prefixmask.sin6_len &&
900 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
901 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
902 " existing (%s) address should not be changed\n",
903 ip6_sprintf(&ia->ia_addr.sin6_addr)));
904 error = EINVAL;
905 goto unlink;
906 }
907 ia->ia_prefixmask = ifra->ifra_prefixmask;
908 }
909
910 /*
911 * If a new destination address is specified, scrub the old one and
912 * install the new destination. Note that the interface must be
913 * p2p or loopback (see the check above.)
914 */
915 if (dst6.sin6_family == AF_INET6 &&
916 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
917 int e;
918
919 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
920 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
921 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
922 "a route to the old destination: %s\n",
923 ip6_sprintf(&ia->ia_addr.sin6_addr)));
924 /* proceed anyway... */
925 } else
926 ia->ia_flags &= ~IFA_ROUTE;
927 ia->ia_dstaddr = dst6;
928 }
929
930 /* reset the interface and routing table appropriately. */
931 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
932 goto unlink;
933
934 /*
935 * Beyond this point, we should call in6_purgeaddr upon an error,
936 * not just go to unlink.
937 */
938
939 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
940 struct sockaddr_in6 mltaddr, mltmask;
941 struct in6_multi *in6m;
942
943 if (hostIsNew) {
944 /* join solicited multicast addr for new host id */
945 struct in6_addr llsol;
946
947 bzero(&llsol, sizeof(struct in6_addr));
948 llsol.s6_addr16[0] = htons(0xff02);
949 llsol.s6_addr16[1] = htons(ifp->if_index);
950 llsol.s6_addr32[1] = 0;
951 llsol.s6_addr32[2] = htonl(1);
952 llsol.s6_addr32[3] =
953 ifra->ifra_addr.sin6_addr.s6_addr32[3];
954 llsol.s6_addr8[12] = 0xff;
955 (void)in6_addmulti(&llsol, ifp, &error);
956 if (error != 0) {
957 nd6log((LOG_WARNING,
958 "in6_update_ifa: addmulti failed for "
959 "%s on %s (errno=%d)\n",
960 ip6_sprintf(&llsol), if_name(ifp),
961 error));
962 in6_purgeaddr((struct ifaddr *)ia);
963 return (error);
964 }
965 }
966
967 bzero(&mltmask, sizeof(mltmask));
968 mltmask.sin6_len = sizeof(struct sockaddr_in6);
969 mltmask.sin6_family = AF_INET6;
970 mltmask.sin6_addr = in6mask32;
971
972 /*
973 * join link-local all-nodes address
974 */
975 bzero(&mltaddr, sizeof(mltaddr));
976 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
977 mltaddr.sin6_family = AF_INET6;
978 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
979 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
980
981 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
982 if (in6m == NULL) {
983 rtrequest(RTM_ADD,
984 (struct sockaddr *)&mltaddr,
985 (struct sockaddr *)&ia->ia_addr,
986 (struct sockaddr *)&mltmask,
987 RTF_UP|RTF_CLONING, /* xxx */
988 (struct rtentry **)0);
989 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
990 if (error != 0) {
991 nd6log((LOG_WARNING,
992 "in6_update_ifa: addmulti failed for "
993 "%s on %s (errno=%d)\n",
994 ip6_sprintf(&mltaddr.sin6_addr),
995 if_name(ifp), error));
996 }
997 }
998
999 /*
1000 * join node information group address
1001 */
1002 #define hostnamelen strlen(hostname)
1003 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1004 == 0) {
1005 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
1006 if (in6m == NULL && ia != NULL) {
1007 (void)in6_addmulti(&mltaddr.sin6_addr,
1008 ifp, &error);
1009 if (error != 0) {
1010 nd6log((LOG_WARNING, "in6_update_ifa: "
1011 "addmulti failed for "
1012 "%s on %s (errno=%d)\n",
1013 ip6_sprintf(&mltaddr.sin6_addr),
1014 if_name(ifp), error));
1015 }
1016 }
1017 }
1018 #undef hostnamelen
1019
1020 /*
1021 * join node-local all-nodes address, on loopback.
1022 * XXX: since "node-local" is obsoleted by interface-local,
1023 * we have to join the group on every interface with
1024 * some interface-boundary restriction.
1025 */
1026 if (ifp->if_flags & IFF_LOOPBACK) {
1027 struct in6_ifaddr *ia_loop;
1028
1029 struct in6_addr loop6 = in6addr_loopback;
1030 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6);
1031
1032 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1033
1034 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
1035 if (in6m == NULL && ia_loop != NULL) {
1036 rtrequest(RTM_ADD,
1037 (struct sockaddr *)&mltaddr,
1038 (struct sockaddr *)&ia_loop->ia_addr,
1039 (struct sockaddr *)&mltmask,
1040 RTF_UP,
1041 (struct rtentry **)0);
1042 (void)in6_addmulti(&mltaddr.sin6_addr, ifp,
1043 &error);
1044 if (error != 0) {
1045 nd6log((LOG_WARNING, "in6_update_ifa: "
1046 "addmulti failed for %s on %s "
1047 "(errno=%d)\n",
1048 ip6_sprintf(&mltaddr.sin6_addr),
1049 if_name(ifp), error));
1050 }
1051 }
1052 }
1053 }
1054
1055 ia->ia6_flags = ifra->ifra_flags;
1056 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/
1057 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */
1058
1059 ia->ia6_lifetime = ifra->ifra_lifetime;
1060 /* for sanity */
1061 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1062 ia->ia6_lifetime.ia6t_expire =
1063 time_second + ia->ia6_lifetime.ia6t_vltime;
1064 } else
1065 ia->ia6_lifetime.ia6t_expire = 0;
1066 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1067 ia->ia6_lifetime.ia6t_preferred =
1068 time_second + ia->ia6_lifetime.ia6t_pltime;
1069 } else
1070 ia->ia6_lifetime.ia6t_preferred = 0;
1071
1072 /*
1073 * Perform DAD, if needed.
1074 * XXX It may be of use, if we can administratively
1075 * disable DAD.
1076 */
1077 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) {
1078 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1079 nd6_dad_start((struct ifaddr *)ia, NULL);
1080 }
1081
1082 return (error);
1083
1084 unlink:
1085 /*
1086 * XXX: if a change of an existing address failed, keep the entry
1087 * anyway.
1088 */
1089 if (hostIsNew)
1090 in6_unlink_ifa(ia, ifp);
1091 return (error);
1092 }
1093
1094 void
1095 in6_purgeaddr(ifa)
1096 struct ifaddr *ifa;
1097 {
1098 struct ifnet *ifp = ifa->ifa_ifp;
1099 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1100
1101 /* stop DAD processing */
1102 nd6_dad_stop(ifa);
1103
1104 /*
1105 * delete route to the destination of the address being purged.
1106 * The interface must be p2p or loopback in this case.
1107 */
1108 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1109 int e;
1110
1111 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1112 != 0) {
1113 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1114 "a route to the p2p destination: %s on %s, "
1115 "errno=%d\n",
1116 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1117 e);
1118 /* proceed anyway... */
1119 } else
1120 ia->ia_flags &= ~IFA_ROUTE;
1121 }
1122
1123 /* Remove ownaddr's loopback rtentry, if it exists. */
1124 in6_ifremloop(&(ia->ia_ifa));
1125
1126 if (ifp->if_flags & IFF_MULTICAST) {
1127 /*
1128 * delete solicited multicast addr for deleting host id
1129 */
1130 struct in6_multi *in6m;
1131 struct in6_addr llsol;
1132 bzero(&llsol, sizeof(struct in6_addr));
1133 llsol.s6_addr16[0] = htons(0xff02);
1134 llsol.s6_addr16[1] = htons(ifp->if_index);
1135 llsol.s6_addr32[1] = 0;
1136 llsol.s6_addr32[2] = htonl(1);
1137 llsol.s6_addr32[3] =
1138 ia->ia_addr.sin6_addr.s6_addr32[3];
1139 llsol.s6_addr8[12] = 0xff;
1140
1141 IN6_LOOKUP_MULTI(llsol, ifp, in6m);
1142 if (in6m)
1143 in6_delmulti(in6m);
1144 }
1145
1146 in6_unlink_ifa(ia, ifp);
1147 }
1148
1149 static void
1150 in6_unlink_ifa(ia, ifp)
1151 struct in6_ifaddr *ia;
1152 struct ifnet *ifp;
1153 {
1154 struct in6_ifaddr *oia;
1155 int s = splnet();
1156
1157 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1158
1159 oia = ia;
1160 if (oia == (ia = in6_ifaddr))
1161 in6_ifaddr = ia->ia_next;
1162 else {
1163 while (ia->ia_next && (ia->ia_next != oia))
1164 ia = ia->ia_next;
1165 if (ia->ia_next)
1166 ia->ia_next = oia->ia_next;
1167 else {
1168 /* search failed */
1169 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1170 }
1171 }
1172
1173 /*
1174 * When an autoconfigured address is being removed, release the
1175 * reference to the base prefix. Also, since the release might
1176 * affect the status of other (detached) addresses, call
1177 * pfxlist_onlink_check().
1178 */
1179 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) {
1180 if (oia->ia6_ndpr == NULL) {
1181 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
1182 "%p has no prefix\n", oia));
1183 } else {
1184 oia->ia6_ndpr->ndpr_refcnt--;
1185 oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
1186 oia->ia6_ndpr = NULL;
1187 }
1188
1189 pfxlist_onlink_check();
1190 }
1191
1192 /*
1193 * release another refcnt for the link from in6_ifaddr.
1194 * Note that we should decrement the refcnt at least once for all *BSD.
1195 */
1196 IFAFREE(&oia->ia_ifa);
1197
1198 splx(s);
1199 }
1200
1201 void
1202 in6_purgeif(ifp)
1203 struct ifnet *ifp;
1204 {
1205 struct ifaddr *ifa, *nifa;
1206
1207 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
1208 nifa = TAILQ_NEXT(ifa, ifa_list);
1209 if (ifa->ifa_addr->sa_family != AF_INET6)
1210 continue;
1211 in6_purgeaddr(ifa);
1212 }
1213
1214 in6_ifdetach(ifp);
1215 }
1216
1217 /*
1218 * SIOC[GAD]LIFADDR.
1219 * SIOCGLIFADDR: get first address. (?)
1220 * SIOCGLIFADDR with IFLR_PREFIX:
1221 * get first address that matches the specified prefix.
1222 * SIOCALIFADDR: add the specified address.
1223 * SIOCALIFADDR with IFLR_PREFIX:
1224 * add the specified prefix, filling hostid part from
1225 * the first link-local address. prefixlen must be <= 64.
1226 * SIOCDLIFADDR: delete the specified address.
1227 * SIOCDLIFADDR with IFLR_PREFIX:
1228 * delete the first address that matches the specified prefix.
1229 * return values:
1230 * EINVAL on invalid parameters
1231 * EADDRNOTAVAIL on prefix match failed/specified address not found
1232 * other values may be returned from in6_ioctl()
1233 *
1234 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1235 * this is to accomodate address naming scheme other than RFC2374,
1236 * in the future.
1237 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1238 * address encoding scheme. (see figure on page 8)
1239 */
1240 static int
1241 in6_lifaddr_ioctl(so, cmd, data, ifp, td)
1242 struct socket *so;
1243 u_long cmd;
1244 caddr_t data;
1245 struct ifnet *ifp;
1246 struct thread *td;
1247 {
1248 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1249 struct ifaddr *ifa;
1250 struct sockaddr *sa;
1251
1252 /* sanity checks */
1253 if (!data || !ifp) {
1254 panic("invalid argument to in6_lifaddr_ioctl");
1255 /* NOTREACHED */
1256 }
1257
1258 switch (cmd) {
1259 case SIOCGLIFADDR:
1260 /* address must be specified on GET with IFLR_PREFIX */
1261 if ((iflr->flags & IFLR_PREFIX) == 0)
1262 break;
1263 /* FALLTHROUGH */
1264 case SIOCALIFADDR:
1265 case SIOCDLIFADDR:
1266 /* address must be specified on ADD and DELETE */
1267 sa = (struct sockaddr *)&iflr->addr;
1268 if (sa->sa_family != AF_INET6)
1269 return EINVAL;
1270 if (sa->sa_len != sizeof(struct sockaddr_in6))
1271 return EINVAL;
1272 /* XXX need improvement */
1273 sa = (struct sockaddr *)&iflr->dstaddr;
1274 if (sa->sa_family && sa->sa_family != AF_INET6)
1275 return EINVAL;
1276 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1277 return EINVAL;
1278 break;
1279 default: /* shouldn't happen */
1280 #if 0
1281 panic("invalid cmd to in6_lifaddr_ioctl");
1282 /* NOTREACHED */
1283 #else
1284 return EOPNOTSUPP;
1285 #endif
1286 }
1287 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1288 return EINVAL;
1289
1290 switch (cmd) {
1291 case SIOCALIFADDR:
1292 {
1293 struct in6_aliasreq ifra;
1294 struct in6_addr *hostid = NULL;
1295 int prefixlen;
1296
1297 if ((iflr->flags & IFLR_PREFIX) != 0) {
1298 struct sockaddr_in6 *sin6;
1299
1300 /*
1301 * hostid is to fill in the hostid part of the
1302 * address. hostid points to the first link-local
1303 * address attached to the interface.
1304 */
1305 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1306 if (!ifa)
1307 return EADDRNOTAVAIL;
1308 hostid = IFA_IN6(ifa);
1309
1310 /* prefixlen must be <= 64. */
1311 if (64 < iflr->prefixlen)
1312 return EINVAL;
1313 prefixlen = iflr->prefixlen;
1314
1315 /* hostid part must be zero. */
1316 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1317 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1318 sin6->sin6_addr.s6_addr32[3] != 0) {
1319 return EINVAL;
1320 }
1321 } else
1322 prefixlen = iflr->prefixlen;
1323
1324 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1325 bzero(&ifra, sizeof(ifra));
1326 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1327
1328 bcopy(&iflr->addr, &ifra.ifra_addr,
1329 ((struct sockaddr *)&iflr->addr)->sa_len);
1330 if (hostid) {
1331 /* fill in hostid part */
1332 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1333 hostid->s6_addr32[2];
1334 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1335 hostid->s6_addr32[3];
1336 }
1337
1338 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1339 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1340 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1341 if (hostid) {
1342 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1343 hostid->s6_addr32[2];
1344 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1345 hostid->s6_addr32[3];
1346 }
1347 }
1348
1349 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1350 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1351
1352 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1353 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1354 }
1355 case SIOCGLIFADDR:
1356 case SIOCDLIFADDR:
1357 {
1358 struct in6_ifaddr *ia;
1359 struct in6_addr mask, candidate, match;
1360 struct sockaddr_in6 *sin6;
1361 int cmp;
1362
1363 bzero(&mask, sizeof(mask));
1364 if (iflr->flags & IFLR_PREFIX) {
1365 /* lookup a prefix rather than address. */
1366 in6_prefixlen2mask(&mask, iflr->prefixlen);
1367
1368 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1369 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1370 match.s6_addr32[0] &= mask.s6_addr32[0];
1371 match.s6_addr32[1] &= mask.s6_addr32[1];
1372 match.s6_addr32[2] &= mask.s6_addr32[2];
1373 match.s6_addr32[3] &= mask.s6_addr32[3];
1374
1375 /* if you set extra bits, that's wrong */
1376 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1377 return EINVAL;
1378
1379 cmp = 1;
1380 } else {
1381 if (cmd == SIOCGLIFADDR) {
1382 /* on getting an address, take the 1st match */
1383 cmp = 0; /* XXX */
1384 } else {
1385 /* on deleting an address, do exact match */
1386 in6_prefixlen2mask(&mask, 128);
1387 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1388 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1389
1390 cmp = 1;
1391 }
1392 }
1393
1394 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1395 if (ifa->ifa_addr->sa_family != AF_INET6)
1396 continue;
1397 if (!cmp)
1398 break;
1399
1400 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1401 /*
1402 * XXX: this is adhoc, but is necessary to allow
1403 * a user to specify fe80::/64 (not /10) for a
1404 * link-local address.
1405 */
1406 if (IN6_IS_ADDR_LINKLOCAL(&candidate))
1407 candidate.s6_addr16[1] = 0;
1408 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1409 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1410 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1411 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1412 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1413 break;
1414 }
1415 if (!ifa)
1416 return EADDRNOTAVAIL;
1417 ia = ifa2ia6(ifa);
1418
1419 if (cmd == SIOCGLIFADDR) {
1420 struct sockaddr_in6 *s6;
1421
1422 /* fill in the if_laddrreq structure */
1423 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1424 s6 = (struct sockaddr_in6 *)&iflr->addr;
1425 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1426 s6->sin6_addr.s6_addr16[1] = 0;
1427 if (in6_addr2zoneid(ifp, &s6->sin6_addr,
1428 &s6->sin6_scope_id))
1429 return (EINVAL); /* XXX */
1430 }
1431 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1432 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1433 ia->ia_dstaddr.sin6_len);
1434 s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
1435 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1436 s6->sin6_addr.s6_addr16[1] = 0;
1437 if (in6_addr2zoneid(ifp,
1438 &s6->sin6_addr, &s6->sin6_scope_id))
1439 return (EINVAL); /* EINVAL */
1440 }
1441 } else
1442 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1443
1444 iflr->prefixlen =
1445 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1446
1447 iflr->flags = ia->ia6_flags; /* XXX */
1448
1449 return 0;
1450 } else {
1451 struct in6_aliasreq ifra;
1452
1453 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1454 bzero(&ifra, sizeof(ifra));
1455 bcopy(iflr->iflr_name, ifra.ifra_name,
1456 sizeof(ifra.ifra_name));
1457
1458 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1459 ia->ia_addr.sin6_len);
1460 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1461 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1462 ia->ia_dstaddr.sin6_len);
1463 } else {
1464 bzero(&ifra.ifra_dstaddr,
1465 sizeof(ifra.ifra_dstaddr));
1466 }
1467 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1468 ia->ia_prefixmask.sin6_len);
1469
1470 ifra.ifra_flags = ia->ia6_flags;
1471 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1472 ifp, td);
1473 }
1474 }
1475 }
1476
1477 return EOPNOTSUPP; /* just for safety */
1478 }
1479
1480 /*
1481 * Initialize an interface's intetnet6 address
1482 * and routing table entry.
1483 */
1484 static int
1485 in6_ifinit(ifp, ia, sin6, newhost)
1486 struct ifnet *ifp;
1487 struct in6_ifaddr *ia;
1488 struct sockaddr_in6 *sin6;
1489 int newhost;
1490 {
1491 int error = 0, plen, ifacount = 0;
1492 int s = splimp();
1493 struct ifaddr *ifa;
1494
1495 /*
1496 * Give the interface a chance to initialize
1497 * if this is its first address,
1498 * and to validate the address if necessary.
1499 */
1500 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1501 if (ifa->ifa_addr == NULL)
1502 continue; /* just for safety */
1503 if (ifa->ifa_addr->sa_family != AF_INET6)
1504 continue;
1505 ifacount++;
1506 }
1507
1508 ia->ia_addr = *sin6;
1509
1510 if (ifacount <= 1 && ifp->if_ioctl &&
1511 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
1512 splx(s);
1513 return (error);
1514 }
1515 splx(s);
1516
1517 ia->ia_ifa.ifa_metric = ifp->if_metric;
1518
1519 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1520
1521 /*
1522 * Special case:
1523 * If a new destination address is specified for a point-to-point
1524 * interface, install a route to the destination as an interface
1525 * direct route.
1526 * XXX: the logic below rejects assigning multiple addresses on a p2p
1527 * interface that share a same destination.
1528 */
1529 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1530 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1531 ia->ia_dstaddr.sin6_family == AF_INET6) {
1532 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
1533 RTF_UP | RTF_HOST)) != 0)
1534 return (error);
1535 ia->ia_flags |= IFA_ROUTE;
1536 }
1537 if (plen < 128) {
1538 /*
1539 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1540 */
1541 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1542 }
1543
1544 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1545 if (newhost) {
1546 /* set the rtrequest function to create llinfo */
1547 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1548 in6_ifaddloop(&(ia->ia_ifa));
1549 }
1550
1551 return (error);
1552 }
1553
1554 /*
1555 * Find an IPv6 interface link-local address specific to an interface.
1556 */
1557 struct in6_ifaddr *
1558 in6ifa_ifpforlinklocal(ifp, ignoreflags)
1559 struct ifnet *ifp;
1560 int ignoreflags;
1561 {
1562 struct ifaddr *ifa;
1563
1564 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1565 if (ifa->ifa_addr == NULL)
1566 continue; /* just for safety */
1567 if (ifa->ifa_addr->sa_family != AF_INET6)
1568 continue;
1569 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1570 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1571 ignoreflags) != 0)
1572 continue;
1573 break;
1574 }
1575 }
1576
1577 return ((struct in6_ifaddr *)ifa);
1578 }
1579
1580
1581 /*
1582 * find the internet address corresponding to a given interface and address.
1583 */
1584 struct in6_ifaddr *
1585 in6ifa_ifpwithaddr(ifp, addr)
1586 struct ifnet *ifp;
1587 struct in6_addr *addr;
1588 {
1589 struct ifaddr *ifa;
1590
1591 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1592 if (ifa->ifa_addr == NULL)
1593 continue; /* just for safety */
1594 if (ifa->ifa_addr->sa_family != AF_INET6)
1595 continue;
1596 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1597 break;
1598 }
1599
1600 return ((struct in6_ifaddr *)ifa);
1601 }
1602
1603 /*
1604 * Convert IP6 address to printable (loggable) representation.
1605 */
1606 static char digits[] = "0123456789abcdef";
1607 static int ip6round = 0;
1608 char *
1609 ip6_sprintf(addr)
1610 const struct in6_addr *addr;
1611 {
1612 static char ip6buf[8][48];
1613 int i;
1614 char *cp;
1615 const u_int16_t *a = (const u_int16_t *)addr;
1616 const u_int8_t *d;
1617 int dcolon = 0;
1618
1619 ip6round = (ip6round + 1) & 7;
1620 cp = ip6buf[ip6round];
1621
1622 for (i = 0; i < 8; i++) {
1623 if (dcolon == 1) {
1624 if (*a == 0) {
1625 if (i == 7)
1626 *cp++ = ':';
1627 a++;
1628 continue;
1629 } else
1630 dcolon = 2;
1631 }
1632 if (*a == 0) {
1633 if (dcolon == 0 && *(a + 1) == 0) {
1634 if (i == 0)
1635 *cp++ = ':';
1636 *cp++ = ':';
1637 dcolon = 1;
1638 } else {
1639 *cp++ = '';
1640 *cp++ = ':';
1641 }
1642 a++;
1643 continue;
1644 }
1645 d = (const u_char *)a;
1646 *cp++ = digits[*d >> 4];
1647 *cp++ = digits[*d++ & 0xf];
1648 *cp++ = digits[*d >> 4];
1649 *cp++ = digits[*d & 0xf];
1650 *cp++ = ':';
1651 a++;
1652 }
1653 *--cp = 0;
1654 return (ip6buf[ip6round]);
1655 }
1656
1657 int
1658 in6_localaddr(in6)
1659 struct in6_addr *in6;
1660 {
1661 struct in6_ifaddr *ia;
1662
1663 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1664 return 1;
1665
1666 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1667 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1668 &ia->ia_prefixmask.sin6_addr)) {
1669 return 1;
1670 }
1671 }
1672
1673 return (0);
1674 }
1675
1676 int
1677 in6_is_addr_deprecated(sa6)
1678 struct sockaddr_in6 *sa6;
1679 {
1680 struct in6_ifaddr *ia;
1681
1682 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1683 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1684 &sa6->sin6_addr) &&
1685 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1686 return (1); /* true */
1687
1688 /* XXX: do we still have to go thru the rest of the list? */
1689 }
1690
1691 return (0); /* false */
1692 }
1693
1694 /*
1695 * return length of part which dst and src are equal
1696 * hard coding...
1697 */
1698 int
1699 in6_matchlen(src, dst)
1700 struct in6_addr *src, *dst;
1701 {
1702 int match = 0;
1703 u_char *s = (u_char *)src, *d = (u_char *)dst;
1704 u_char *lim = s + 16, r;
1705
1706 while (s < lim)
1707 if ((r = (*d++ ^ *s++)) != 0) {
1708 while (r < 128) {
1709 match++;
1710 r <<= 1;
1711 }
1712 break;
1713 } else
1714 match += 8;
1715 return match;
1716 }
1717
1718 /* XXX: to be scope conscious */
1719 int
1720 in6_are_prefix_equal(p1, p2, len)
1721 struct in6_addr *p1, *p2;
1722 int len;
1723 {
1724 int bytelen, bitlen;
1725
1726 /* sanity check */
1727 if (0 > len || len > 128) {
1728 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1729 len);
1730 return (0);
1731 }
1732
1733 bytelen = len / 8;
1734 bitlen = len % 8;
1735
1736 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1737 return (0);
1738 if (bitlen != 0 &&
1739 p1->s6_addr[bytelen] >> (8 - bitlen) !=
1740 p2->s6_addr[bytelen] >> (8 - bitlen))
1741 return (0);
1742
1743 return (1);
1744 }
1745
1746 void
1747 in6_prefixlen2mask(maskp, len)
1748 struct in6_addr *maskp;
1749 int len;
1750 {
1751 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1752 int bytelen, bitlen, i;
1753
1754 /* sanity check */
1755 if (0 > len || len > 128) {
1756 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1757 len);
1758 return;
1759 }
1760
1761 bzero(maskp, sizeof(*maskp));
1762 bytelen = len / 8;
1763 bitlen = len % 8;
1764 for (i = 0; i < bytelen; i++)
1765 maskp->s6_addr[i] = 0xff;
1766 if (bitlen)
1767 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1768 }
1769
1770 /*
1771 * return the best address out of the same scope. if no address was
1772 * found, return the first valid address from designated IF.
1773 */
1774 struct in6_ifaddr *
1775 in6_ifawithifp(ifp, dst)
1776 struct ifnet *ifp;
1777 struct in6_addr *dst;
1778 {
1779 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
1780 struct ifaddr *ifa;
1781 struct in6_ifaddr *besta = 0;
1782 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
1783
1784 dep[0] = dep[1] = NULL;
1785
1786 /*
1787 * We first look for addresses in the same scope.
1788 * If there is one, return it.
1789 * If two or more, return one which matches the dst longest.
1790 * If none, return one of global addresses assigned other ifs.
1791 */
1792 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1793 if (ifa->ifa_addr->sa_family != AF_INET6)
1794 continue;
1795 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1796 continue; /* XXX: is there any case to allow anycast? */
1797 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1798 continue; /* don't use this interface */
1799 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1800 continue;
1801 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1802 if (ip6_use_deprecated)
1803 dep[0] = (struct in6_ifaddr *)ifa;
1804 continue;
1805 }
1806
1807 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1808 /*
1809 * call in6_matchlen() as few as possible
1810 */
1811 if (besta) {
1812 if (blen == -1)
1813 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1814 tlen = in6_matchlen(IFA_IN6(ifa), dst);
1815 if (tlen > blen) {
1816 blen = tlen;
1817 besta = (struct in6_ifaddr *)ifa;
1818 }
1819 } else
1820 besta = (struct in6_ifaddr *)ifa;
1821 }
1822 }
1823 if (besta)
1824 return (besta);
1825
1826 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1827 if (ifa->ifa_addr->sa_family != AF_INET6)
1828 continue;
1829 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1830 continue; /* XXX: is there any case to allow anycast? */
1831 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1832 continue; /* don't use this interface */
1833 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1834 continue;
1835 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1836 if (ip6_use_deprecated)
1837 dep[1] = (struct in6_ifaddr *)ifa;
1838 continue;
1839 }
1840
1841 return (struct in6_ifaddr *)ifa;
1842 }
1843
1844 /* use the last-resort values, that are, deprecated addresses */
1845 if (dep[0])
1846 return dep[0];
1847 if (dep[1])
1848 return dep[1];
1849
1850 return NULL;
1851 }
1852
1853 /*
1854 * perform DAD when interface becomes IFF_UP.
1855 */
1856 void
1857 in6_if_up(ifp)
1858 struct ifnet *ifp;
1859 {
1860 struct ifaddr *ifa;
1861 struct in6_ifaddr *ia;
1862 int dad_delay; /* delay ticks before DAD output */
1863
1864 /*
1865 * special cases, like 6to4, are handled in in6_ifattach
1866 */
1867 in6_ifattach(ifp, NULL);
1868
1869 dad_delay = 0;
1870 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1871 if (ifa->ifa_addr->sa_family != AF_INET6)
1872 continue;
1873 ia = (struct in6_ifaddr *)ifa;
1874 if (ia->ia6_flags & IN6_IFF_TENTATIVE)
1875 nd6_dad_start(ifa, &dad_delay);
1876 }
1877 }
1878
1879 int
1880 in6if_do_dad(ifp)
1881 struct ifnet *ifp;
1882 {
1883 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1884 return (0);
1885
1886 switch (ifp->if_type) {
1887 #ifdef IFT_DUMMY
1888 case IFT_DUMMY:
1889 #endif
1890 case IFT_FAITH:
1891 /*
1892 * These interfaces do not have the IFF_LOOPBACK flag,
1893 * but loop packets back. We do not have to do DAD on such
1894 * interfaces. We should even omit it, because loop-backed
1895 * NS would confuse the DAD procedure.
1896 */
1897 return (0);
1898 default:
1899 /*
1900 * Our DAD routine requires the interface up and running.
1901 * However, some interfaces can be up before the RUNNING
1902 * status. Additionaly, users may try to assign addresses
1903 * before the interface becomes up (or running).
1904 * We simply skip DAD in such a case as a work around.
1905 * XXX: we should rather mark "tentative" on such addresses,
1906 * and do DAD after the interface becomes ready.
1907 */
1908 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
1909 (IFF_UP|IFF_RUNNING))
1910 return (0);
1911
1912 return (1);
1913 }
1914 }
1915
1916 /*
1917 * Calculate max IPv6 MTU through all the interfaces and store it
1918 * to in6_maxmtu.
1919 */
1920 void
1921 in6_setmaxmtu()
1922 {
1923 unsigned long maxmtu = 0;
1924 struct ifnet *ifp;
1925
1926 IFNET_RLOCK();
1927 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1928 /* this function can be called during ifnet initialization */
1929 if (!ifp->if_afdata[AF_INET6])
1930 continue;
1931 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1932 IN6_LINKMTU(ifp) > maxmtu)
1933 maxmtu = IN6_LINKMTU(ifp);
1934 }
1935 IFNET_RUNLOCK();
1936 if (maxmtu) /* update only when maxmtu is positive */
1937 in6_maxmtu = maxmtu;
1938 }
1939
1940 void *
1941 in6_domifattach(ifp)
1942 struct ifnet *ifp;
1943 {
1944 struct in6_ifextra *ext;
1945
1946 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
1947 bzero(ext, sizeof(*ext));
1948
1949 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
1950 M_IFADDR, M_WAITOK);
1951 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
1952
1953 ext->icmp6_ifstat =
1954 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
1955 M_IFADDR, M_WAITOK);
1956 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
1957
1958 ext->nd_ifinfo = nd6_ifattach(ifp);
1959 ext->scope6_id = scope6_ifattach(ifp);
1960 return ext;
1961 }
1962
1963 void
1964 in6_domifdetach(ifp, aux)
1965 struct ifnet *ifp;
1966 void *aux;
1967 {
1968 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
1969
1970 scope6_ifdetach(ext->scope6_id);
1971 nd6_ifdetach(ext->nd_ifinfo);
1972 free(ext->in6_ifstat, M_IFADDR);
1973 free(ext->icmp6_ifstat, M_IFADDR);
1974 free(ext, M_IFADDR);
1975 }
1976
1977 /*
1978 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
1979 * v4 mapped addr or v4 compat addr
1980 */
1981 void
1982 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
1983 {
1984 bzero(sin, sizeof(*sin));
1985 sin->sin_len = sizeof(struct sockaddr_in);
1986 sin->sin_family = AF_INET;
1987 sin->sin_port = sin6->sin6_port;
1988 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
1989 }
1990
1991 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
1992 void
1993 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
1994 {
1995 bzero(sin6, sizeof(*sin6));
1996 sin6->sin6_len = sizeof(struct sockaddr_in6);
1997 sin6->sin6_family = AF_INET6;
1998 sin6->sin6_port = sin->sin_port;
1999 sin6->sin6_addr.s6_addr32[0] = 0;
2000 sin6->sin6_addr.s6_addr32[1] = 0;
2001 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2002 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2003 }
2004
2005 /* Convert sockaddr_in6 into sockaddr_in. */
2006 void
2007 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2008 {
2009 struct sockaddr_in *sin_p;
2010 struct sockaddr_in6 sin6;
2011
2012 /*
2013 * Save original sockaddr_in6 addr and convert it
2014 * to sockaddr_in.
2015 */
2016 sin6 = *(struct sockaddr_in6 *)nam;
2017 sin_p = (struct sockaddr_in *)nam;
2018 in6_sin6_2_sin(sin_p, &sin6);
2019 }
2020
2021 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2022 void
2023 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2024 {
2025 struct sockaddr_in *sin_p;
2026 struct sockaddr_in6 *sin6_p;
2027
2028 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
2029 M_WAITOK);
2030 sin_p = (struct sockaddr_in *)*nam;
2031 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2032 FREE(*nam, M_SONAME);
2033 *nam = (struct sockaddr *)sin6_p;
2034 }
Cache object: 19837feeb4008e560cdd502872114a9c
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