FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /* $NetBSD: in6.c,v 1.119.2.1 2008/10/03 10:31:59 jdc Exp $ */
2 /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun 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 * 3. 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 <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.119.2.1 2008/10/03 10:31:59 jdc Exp $");
66
67 #include "opt_inet.h"
68 #include "opt_pfil_hooks.h"
69
70 #include <sys/param.h>
71 #include <sys/ioctl.h>
72 #include <sys/errno.h>
73 #include <sys/malloc.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/sockio.h>
77 #include <sys/systm.h>
78 #include <sys/proc.h>
79 #include <sys/time.h>
80 #include <sys/kernel.h>
81 #include <sys/syslog.h>
82 #include <sys/kauth.h>
83
84 #include <net/if.h>
85 #include <net/if_types.h>
86 #include <net/route.h>
87 #include <net/if_dl.h>
88
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <net/if_ether.h>
92
93 #include <netinet/ip6.h>
94 #include <netinet6/ip6_var.h>
95 #include <netinet6/nd6.h>
96 #include <netinet6/mld6_var.h>
97 #include <netinet6/ip6_mroute.h>
98 #include <netinet6/in6_ifattach.h>
99 #include <netinet6/scope6_var.h>
100
101 #include <net/net_osdep.h>
102
103 #ifdef PFIL_HOOKS
104 #include <net/pfil.h>
105 #endif
106
107 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options");
108
109 /* enable backward compatibility code for obsoleted ioctls */
110 #define COMPAT_IN6IFIOCTL
111
112 /*
113 * Definitions of some constant IP6 addresses.
114 */
115 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
116 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
117 const struct in6_addr in6addr_nodelocal_allnodes =
118 IN6ADDR_NODELOCAL_ALLNODES_INIT;
119 const struct in6_addr in6addr_linklocal_allnodes =
120 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
121 const struct in6_addr in6addr_linklocal_allrouters =
122 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
123
124 const struct in6_addr in6mask0 = IN6MASK0;
125 const struct in6_addr in6mask32 = IN6MASK32;
126 const struct in6_addr in6mask64 = IN6MASK64;
127 const struct in6_addr in6mask96 = IN6MASK96;
128 const struct in6_addr in6mask128 = IN6MASK128;
129
130 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
131 0, 0, IN6ADDR_ANY_INIT, 0};
132
133 static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t,
134 struct ifnet *, struct lwp *);
135 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
136 struct sockaddr_in6 *, int);
137 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
138
139 /*
140 * Subroutine for in6_ifaddloop() and in6_ifremloop().
141 * This routine does actual work.
142 */
143 static void
144 in6_ifloop_request(int cmd, struct ifaddr *ifa)
145 {
146 struct sockaddr_in6 lo_sa;
147 struct sockaddr_in6 all1_sa;
148 struct rtentry *nrt = NULL;
149 int e;
150
151 bzero(&lo_sa, sizeof(lo_sa));
152 bzero(&all1_sa, sizeof(all1_sa));
153 lo_sa.sin6_family = all1_sa.sin6_family = AF_INET6;
154 lo_sa.sin6_len = all1_sa.sin6_len = sizeof(struct sockaddr_in6);
155 lo_sa.sin6_addr = in6addr_loopback;
156 all1_sa.sin6_addr = in6mask128;
157
158 /*
159 * We specify the address itself as the gateway, and set the
160 * RTF_LLINFO flag, so that the corresponding host route would have
161 * the flag, and thus applications that assume traditional behavior
162 * would be happy. Note that we assume the caller of the function
163 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
164 * which changes the outgoing interface to the loopback interface.
165 */
166 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
167 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
168 if (e != 0) {
169 log(LOG_ERR, "in6_ifloop_request: "
170 "%s operation failed for %s (errno=%d)\n",
171 cmd == RTM_ADD ? "ADD" : "DELETE",
172 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
173 e);
174 }
175
176 /*
177 * Make sure rt_ifa be equal to IFA, the second argument of the
178 * function.
179 * We need this because when we refer to rt_ifa->ia6_flags in
180 * ip6_input, we assume that the rt_ifa points to the address instead
181 * of the loopback address.
182 */
183 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa)
184 rt_replace_ifa(nrt, ifa);
185
186 /*
187 * Report the addition/removal of the address to the routing socket.
188 * XXX: since we called rtinit for a p2p interface with a destination,
189 * we end up reporting twice in such a case. Should we rather
190 * omit the second report?
191 */
192 if (nrt) {
193 rt_newaddrmsg(cmd, ifa, e, nrt);
194 if (cmd == RTM_DELETE) {
195 if (nrt->rt_refcnt <= 0) {
196 /* XXX: we should free the entry ourselves. */
197 nrt->rt_refcnt++;
198 rtfree(nrt);
199 }
200 } else {
201 /* the cmd must be RTM_ADD here */
202 nrt->rt_refcnt--;
203 }
204 }
205 }
206
207 /*
208 * Add ownaddr as loopback rtentry. We previously add the route only if
209 * necessary (ex. on a p2p link). However, since we now manage addresses
210 * separately from prefixes, we should always add the route. We can't
211 * rely on the cloning mechanism from the corresponding interface route
212 * any more.
213 */
214 void
215 in6_ifaddloop(struct ifaddr *ifa)
216 {
217 struct rtentry *rt;
218
219 /* If there is no loopback entry, allocate one. */
220 rt = rtalloc1(ifa->ifa_addr, 0);
221 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
222 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
223 in6_ifloop_request(RTM_ADD, ifa);
224 if (rt)
225 rt->rt_refcnt--;
226 }
227
228 /*
229 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
230 * if it exists.
231 */
232 void
233 in6_ifremloop(struct ifaddr *ifa)
234 {
235 struct in6_ifaddr *ia;
236 struct rtentry *rt;
237 int ia_count = 0;
238
239 /*
240 * Some of BSD variants do not remove cloned routes
241 * from an interface direct route, when removing the direct route
242 * (see comments in net/net_osdep.h). Even for variants that do remove
243 * cloned routes, they could fail to remove the cloned routes when
244 * we handle multple addresses that share a common prefix.
245 * So, we should remove the route corresponding to the deleted address.
246 */
247
248 /*
249 * Delete the entry only if exact one ifa exists. More than one ifa
250 * can exist if we assign a same single address to multiple
251 * (probably p2p) interfaces.
252 * XXX: we should avoid such a configuration in IPv6...
253 */
254 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
255 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
256 ia_count++;
257 if (ia_count > 1)
258 break;
259 }
260 }
261
262 if (ia_count == 1) {
263 /*
264 * Before deleting, check if a corresponding loopbacked host
265 * route surely exists. With this check, we can avoid to
266 * delete an interface direct route whose destination is same
267 * as the address being removed. This can happen when removing
268 * a subnet-router anycast address on an interface attahced
269 * to a shared medium.
270 */
271 rt = rtalloc1(ifa->ifa_addr, 0);
272 if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 &&
273 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
274 rt->rt_refcnt--;
275 in6_ifloop_request(RTM_DELETE, ifa);
276 }
277 }
278 }
279
280 int
281 in6_mask2len(mask, lim0)
282 struct in6_addr *mask;
283 u_char *lim0;
284 {
285 int x = 0, y;
286 u_char *lim = lim0, *p;
287
288 /* ignore the scope_id part */
289 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
290 lim = (u_char *)mask + sizeof(*mask);
291 for (p = (u_char *)mask; p < lim; x++, p++) {
292 if (*p != 0xff)
293 break;
294 }
295 y = 0;
296 if (p < lim) {
297 for (y = 0; y < 8; y++) {
298 if ((*p & (0x80 >> y)) == 0)
299 break;
300 }
301 }
302
303 /*
304 * when the limit pointer is given, do a stricter check on the
305 * remaining bits.
306 */
307 if (p < lim) {
308 if (y != 0 && (*p & (0x00ff >> y)) != 0)
309 return -1;
310 for (p = p + 1; p < lim; p++)
311 if (*p != 0)
312 return -1;
313 }
314
315 return x * 8 + y;
316 }
317
318 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
319 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
320
321 int
322 in6_control(so, cmd, data, ifp, l)
323 struct socket *so;
324 u_long cmd;
325 caddr_t data;
326 struct ifnet *ifp;
327 struct lwp *l;
328 {
329 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
330 struct in6_ifaddr *ia = NULL;
331 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
332 struct sockaddr_in6 *sa6;
333 int error, privileged;
334
335 privileged = 0;
336 if (l && !kauth_authorize_generic(l->l_cred,
337 KAUTH_GENERIC_ISSUSER, &l->l_acflag))
338 privileged++;
339
340 switch (cmd) {
341 /*
342 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc.
343 */
344 case SIOCSIFADDR:
345 case SIOCSIFDSTADDR:
346 #ifdef SIOCSIFCONF_X26
347 case SIOCSIFCONF_X25:
348 #endif
349 return EOPNOTSUPP;
350 case SIOCGETSGCNT_IN6:
351 case SIOCGETMIFCNT_IN6:
352 return mrt6_ioctl(cmd, data);
353 }
354
355 if (ifp == NULL)
356 return EOPNOTSUPP;
357
358 switch (cmd) {
359 case SIOCSNDFLUSH_IN6:
360 case SIOCSPFXFLUSH_IN6:
361 case SIOCSRTRFLUSH_IN6:
362 case SIOCSDEFIFACE_IN6:
363 case SIOCSIFINFO_FLAGS:
364 case SIOCSIFINFO_IN6:
365 if (!privileged)
366 return EPERM;
367 /* FALLTHROUGH */
368 case OSIOCGIFINFO_IN6:
369 case SIOCGIFINFO_IN6:
370 case SIOCGDRLST_IN6:
371 case SIOCGPRLST_IN6:
372 case SIOCGNBRINFO_IN6:
373 case SIOCGDEFIFACE_IN6:
374 return nd6_ioctl(cmd, data, ifp);
375 }
376
377 switch (cmd) {
378 case SIOCSIFPREFIX_IN6:
379 case SIOCDIFPREFIX_IN6:
380 case SIOCAIFPREFIX_IN6:
381 case SIOCCIFPREFIX_IN6:
382 case SIOCSGIFPREFIX_IN6:
383 case SIOCGIFPREFIX_IN6:
384 log(LOG_NOTICE,
385 "prefix ioctls are now invalidated. "
386 "please use ifconfig.\n");
387 return EOPNOTSUPP;
388 }
389
390 switch (cmd) {
391 case SIOCALIFADDR:
392 case SIOCDLIFADDR:
393 if (!privileged)
394 return EPERM;
395 /* FALLTHROUGH */
396 case SIOCGLIFADDR:
397 return in6_lifaddr_ioctl(so, cmd, data, ifp, l);
398 }
399
400 /*
401 * Find address for this interface, if it exists.
402 *
403 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
404 * only, and used the first interface address as the target of other
405 * operations (without checking ifra_addr). This was because netinet
406 * code/API assumed at most 1 interface address per interface.
407 * Since IPv6 allows a node to assign multiple addresses
408 * on a single interface, we almost always look and check the
409 * presence of ifra_addr, and reject invalid ones here.
410 * It also decreases duplicated code among SIOC*_IN6 operations.
411 */
412 switch (cmd) {
413 case SIOCAIFADDR_IN6:
414 case SIOCSIFPHYADDR_IN6:
415 sa6 = &ifra->ifra_addr;
416 break;
417 case SIOCSIFADDR_IN6:
418 case SIOCGIFADDR_IN6:
419 case SIOCSIFDSTADDR_IN6:
420 case SIOCSIFNETMASK_IN6:
421 case SIOCGIFDSTADDR_IN6:
422 case SIOCGIFNETMASK_IN6:
423 case SIOCDIFADDR_IN6:
424 case SIOCGIFPSRCADDR_IN6:
425 case SIOCGIFPDSTADDR_IN6:
426 case SIOCGIFAFLAG_IN6:
427 case SIOCSNDFLUSH_IN6:
428 case SIOCSPFXFLUSH_IN6:
429 case SIOCSRTRFLUSH_IN6:
430 case SIOCGIFALIFETIME_IN6:
431 case SIOCSIFALIFETIME_IN6:
432 case SIOCGIFSTAT_IN6:
433 case SIOCGIFSTAT_ICMP6:
434 sa6 = &ifr->ifr_addr;
435 break;
436 default:
437 sa6 = NULL;
438 break;
439 }
440 if (sa6 && sa6->sin6_family == AF_INET6) {
441 if (sa6->sin6_scope_id != 0)
442 error = sa6_embedscope(sa6, 0);
443 else
444 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
445 if (error != 0)
446 return error;
447 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
448 } else
449 ia = NULL;
450
451 switch (cmd) {
452 case SIOCSIFADDR_IN6:
453 case SIOCSIFDSTADDR_IN6:
454 case SIOCSIFNETMASK_IN6:
455 /*
456 * Since IPv6 allows a node to assign multiple addresses
457 * on a single interface, SIOCSIFxxx ioctls are deprecated.
458 */
459 return EINVAL;
460
461 case SIOCDIFADDR_IN6:
462 /*
463 * for IPv4, we look for existing in_ifaddr here to allow
464 * "ifconfig if0 delete" to remove the first IPv4 address on
465 * the interface. For IPv6, as the spec allows multiple
466 * interface address from the day one, we consider "remove the
467 * first one" semantics to be not preferable.
468 */
469 if (ia == NULL)
470 return EADDRNOTAVAIL;
471 /* FALLTHROUGH */
472 case SIOCAIFADDR_IN6:
473 /*
474 * We always require users to specify a valid IPv6 address for
475 * the corresponding operation.
476 */
477 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
478 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
479 return EAFNOSUPPORT;
480 if (!privileged)
481 return EPERM;
482
483 break;
484
485 case SIOCGIFADDR_IN6:
486 /* This interface is basically deprecated. use SIOCGIFCONF. */
487 /* FALLTHROUGH */
488 case SIOCGIFAFLAG_IN6:
489 case SIOCGIFNETMASK_IN6:
490 case SIOCGIFDSTADDR_IN6:
491 case SIOCGIFALIFETIME_IN6:
492 /* must think again about its semantics */
493 if (ia == NULL)
494 return EADDRNOTAVAIL;
495 break;
496 case SIOCSIFALIFETIME_IN6:
497 {
498 struct in6_addrlifetime *lt;
499
500 if (!privileged)
501 return EPERM;
502 if (ia == NULL)
503 return EADDRNOTAVAIL;
504 /* sanity for overflow - beware unsigned */
505 lt = &ifr->ifr_ifru.ifru_lifetime;
506 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
507 && lt->ia6t_vltime + time_second < time_second) {
508 return EINVAL;
509 }
510 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
511 && lt->ia6t_pltime + time_second < time_second) {
512 return EINVAL;
513 }
514 break;
515 }
516 }
517
518 switch (cmd) {
519
520 case SIOCGIFADDR_IN6:
521 ifr->ifr_addr = ia->ia_addr;
522 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
523 return error;
524 break;
525
526 case SIOCGIFDSTADDR_IN6:
527 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
528 return EINVAL;
529 /*
530 * XXX: should we check if ifa_dstaddr is NULL and return
531 * an error?
532 */
533 ifr->ifr_dstaddr = ia->ia_dstaddr;
534 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
535 return error;
536 break;
537
538 case SIOCGIFNETMASK_IN6:
539 ifr->ifr_addr = ia->ia_prefixmask;
540 break;
541
542 case SIOCGIFAFLAG_IN6:
543 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
544 break;
545
546 case SIOCGIFSTAT_IN6:
547 if (ifp == NULL)
548 return EINVAL;
549 bzero(&ifr->ifr_ifru.ifru_stat,
550 sizeof(ifr->ifr_ifru.ifru_stat));
551 ifr->ifr_ifru.ifru_stat =
552 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
553 break;
554
555 case SIOCGIFSTAT_ICMP6:
556 if (ifp == NULL)
557 return EINVAL;
558 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
559 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
560 ifr->ifr_ifru.ifru_icmp6stat =
561 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
562 break;
563
564 case SIOCGIFALIFETIME_IN6:
565 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
566 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
567 time_t maxexpire;
568 struct in6_addrlifetime *retlt =
569 &ifr->ifr_ifru.ifru_lifetime;
570
571 /*
572 * XXX: adjust expiration time assuming time_t is
573 * signed.
574 */
575 maxexpire = ((time_t)~0) &
576 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
577 if (ia->ia6_lifetime.ia6t_vltime <
578 maxexpire - ia->ia6_updatetime) {
579 retlt->ia6t_expire = ia->ia6_updatetime +
580 ia->ia6_lifetime.ia6t_vltime;
581 } else
582 retlt->ia6t_expire = maxexpire;
583 }
584 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
585 time_t maxexpire;
586 struct in6_addrlifetime *retlt =
587 &ifr->ifr_ifru.ifru_lifetime;
588
589 /*
590 * XXX: adjust expiration time assuming time_t is
591 * signed.
592 */
593 maxexpire = ((time_t)~0) &
594 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
595 if (ia->ia6_lifetime.ia6t_pltime <
596 maxexpire - ia->ia6_updatetime) {
597 retlt->ia6t_preferred = ia->ia6_updatetime +
598 ia->ia6_lifetime.ia6t_pltime;
599 } else
600 retlt->ia6t_preferred = maxexpire;
601 }
602 break;
603
604 case SIOCSIFALIFETIME_IN6:
605 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
606 /* for sanity */
607 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
608 ia->ia6_lifetime.ia6t_expire =
609 time_second + ia->ia6_lifetime.ia6t_vltime;
610 } else
611 ia->ia6_lifetime.ia6t_expire = 0;
612 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
613 ia->ia6_lifetime.ia6t_preferred =
614 time_second + ia->ia6_lifetime.ia6t_pltime;
615 } else
616 ia->ia6_lifetime.ia6t_preferred = 0;
617 break;
618
619 case SIOCAIFADDR_IN6:
620 {
621 int i;
622 struct nd_prefixctl pr0;
623 struct nd_prefix *pr;
624
625 /* reject read-only flags */
626 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 ||
627 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 ||
628 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 ||
629 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) {
630 return EINVAL;
631 }
632 /*
633 * first, make or update the interface address structure,
634 * and link it to the list.
635 */
636 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
637 return error;
638 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
639 == NULL) {
640 /*
641 * this can happen when the user specify the 0 valid
642 * lifetime.
643 */
644 break;
645 }
646
647 /*
648 * then, make the prefix on-link on the interface.
649 * XXX: we'd rather create the prefix before the address, but
650 * we need at least one address to install the corresponding
651 * interface route, so we configure the address first.
652 */
653
654 /*
655 * convert mask to prefix length (prefixmask has already
656 * been validated in in6_update_ifa().
657 */
658 bzero(&pr0, sizeof(pr0));
659 pr0.ndpr_ifp = ifp;
660 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
661 NULL);
662 if (pr0.ndpr_plen == 128) {
663 break; /* we don't need to install a host route. */
664 }
665 pr0.ndpr_prefix = ifra->ifra_addr;
666 /* apply the mask for safety. */
667 for (i = 0; i < 4; i++) {
668 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
669 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
670 }
671 /*
672 * XXX: since we don't have an API to set prefix (not address)
673 * lifetimes, we just use the same lifetimes as addresses.
674 * The (temporarily) installed lifetimes can be overridden by
675 * later advertised RAs (when accept_rtadv is non 0), which is
676 * an intended behavior.
677 */
678 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
679 pr0.ndpr_raf_auto =
680 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
681 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
682 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
683
684 /* add the prefix if not yet. */
685 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
686 /*
687 * nd6_prelist_add will install the corresponding
688 * interface route.
689 */
690 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
691 return error;
692 if (pr == NULL) {
693 log(LOG_ERR, "nd6_prelist_add succeeded but "
694 "no prefix\n");
695 return EINVAL; /* XXX panic here? */
696 }
697 }
698
699 /* relate the address to the prefix */
700 if (ia->ia6_ndpr == NULL) {
701 ia->ia6_ndpr = pr;
702 pr->ndpr_refcnt++;
703
704 /*
705 * If this is the first autoconf address from the
706 * prefix, create a temporary address as well
707 * (when required).
708 */
709 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
710 ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
711 int e;
712 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
713 log(LOG_NOTICE, "in6_control: failed "
714 "to create a temporary address, "
715 "errno=%d\n", e);
716 }
717 }
718 }
719
720 /*
721 * this might affect the status of autoconfigured addresses,
722 * that is, this address might make other addresses detached.
723 */
724 pfxlist_onlink_check();
725
726 #ifdef PFIL_HOOKS
727 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6,
728 ifp, PFIL_IFADDR);
729 #endif
730
731 break;
732 }
733
734 case SIOCDIFADDR_IN6:
735 {
736 struct nd_prefix *pr;
737
738 /*
739 * If the address being deleted is the only one that owns
740 * the corresponding prefix, expire the prefix as well.
741 * XXX: theoretically, we don't have to worry about such
742 * relationship, since we separate the address management
743 * and the prefix management. We do this, however, to provide
744 * as much backward compatibility as possible in terms of
745 * the ioctl operation.
746 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
747 */
748 pr = ia->ia6_ndpr;
749 in6_purgeaddr(&ia->ia_ifa);
750 if (pr && pr->ndpr_refcnt == 0)
751 prelist_remove(pr);
752 #ifdef PFIL_HOOKS
753 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6,
754 ifp, PFIL_IFADDR);
755 #endif
756 break;
757 }
758
759 default:
760 if (ifp == NULL || ifp->if_ioctl == 0)
761 return EOPNOTSUPP;
762 error = ((*ifp->if_ioctl)(ifp, cmd, data));
763 return error;
764 }
765
766 return 0;
767 }
768
769 /*
770 * Update parameters of an IPv6 interface address.
771 * If necessary, a new entry is created and linked into address chains.
772 * This function is separated from in6_control().
773 * XXX: should this be performed under splnet()?
774 */
775 int
776 in6_update_ifa(ifp, ifra, ia, flags)
777 struct ifnet *ifp;
778 struct in6_aliasreq *ifra;
779 struct in6_ifaddr *ia;
780 int flags;
781 {
782 int error = 0, hostIsNew = 0, plen = -1;
783 struct in6_ifaddr *oia;
784 struct sockaddr_in6 dst6;
785 struct in6_addrlifetime *lt;
786 struct in6_multi_mship *imm;
787 struct in6_multi *in6m_sol;
788 struct rtentry *rt;
789 int dad_delay;
790
791 in6m_sol = NULL;
792
793 /* Validate parameters */
794 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
795 return EINVAL;
796
797 /*
798 * The destination address for a p2p link must have a family
799 * of AF_UNSPEC or AF_INET6.
800 */
801 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
802 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
803 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
804 return EAFNOSUPPORT;
805 /*
806 * validate ifra_prefixmask. don't check sin6_family, netmask
807 * does not carry fields other than sin6_len.
808 */
809 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
810 return EINVAL;
811 /*
812 * Because the IPv6 address architecture is classless, we require
813 * users to specify a (non 0) prefix length (mask) for a new address.
814 * We also require the prefix (when specified) mask is valid, and thus
815 * reject a non-consecutive mask.
816 */
817 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
818 return EINVAL;
819 if (ifra->ifra_prefixmask.sin6_len != 0) {
820 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
821 (u_char *)&ifra->ifra_prefixmask +
822 ifra->ifra_prefixmask.sin6_len);
823 if (plen <= 0)
824 return EINVAL;
825 } else {
826 /*
827 * In this case, ia must not be NULL. We just use its prefix
828 * length.
829 */
830 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
831 }
832 /*
833 * If the destination address on a p2p interface is specified,
834 * and the address is a scoped one, validate/set the scope
835 * zone identifier.
836 */
837 dst6 = ifra->ifra_dstaddr;
838 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
839 (dst6.sin6_family == AF_INET6)) {
840 struct in6_addr in6_tmp;
841 u_int32_t zoneid;
842
843 in6_tmp = dst6.sin6_addr;
844 if (in6_setscope(&in6_tmp, ifp, &zoneid))
845 return EINVAL; /* XXX: should be impossible */
846
847 if (dst6.sin6_scope_id != 0) {
848 if (dst6.sin6_scope_id != zoneid)
849 return EINVAL;
850 } else /* user omit to specify the ID. */
851 dst6.sin6_scope_id = zoneid;
852
853 /* convert into the internal form */
854 if (sa6_embedscope(&dst6, 0))
855 return EINVAL; /* XXX: should be impossible */
856 }
857 /*
858 * The destination address can be specified only for a p2p or a
859 * loopback interface. If specified, the corresponding prefix length
860 * must be 128.
861 */
862 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
863 #ifdef FORCE_P2PPLEN
864 int i;
865 #endif
866
867 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
868 /* XXX: noisy message */
869 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
870 "be specified for a p2p or a loopback IF only\n"));
871 return EINVAL;
872 }
873 if (plen != 128) {
874 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
875 "be 128 when dstaddr is specified\n"));
876 #ifdef FORCE_P2PPLEN
877 /*
878 * To be compatible with old configurations,
879 * such as ifconfig gif0 inet6 2001::1 2001::2
880 * prefixlen 126, we override the specified
881 * prefixmask as if the prefix length was 128.
882 */
883 ifra->ifra_prefixmask.sin6_len =
884 sizeof(struct sockaddr_in6);
885 for (i = 0; i < 4; i++)
886 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
887 0xffffffff;
888 plen = 128;
889 #else
890 return EINVAL;
891 #endif
892 }
893 }
894 /* lifetime consistency check */
895 lt = &ifra->ifra_lifetime;
896 if (lt->ia6t_pltime > lt->ia6t_vltime)
897 return EINVAL;
898 if (lt->ia6t_vltime == 0) {
899 /*
900 * the following log might be noisy, but this is a typical
901 * configuration mistake or a tool's bug.
902 */
903 nd6log((LOG_INFO,
904 "in6_update_ifa: valid lifetime is 0 for %s\n",
905 ip6_sprintf(&ifra->ifra_addr.sin6_addr)));
906
907 if (ia == NULL)
908 return 0; /* there's nothing to do */
909 }
910
911 /*
912 * If this is a new address, allocate a new ifaddr and link it
913 * into chains.
914 */
915 if (ia == NULL) {
916 hostIsNew = 1;
917 /*
918 * When in6_update_ifa() is called in a process of a received
919 * RA, it is called under an interrupt context. So, we should
920 * call malloc with M_NOWAIT.
921 */
922 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
923 M_NOWAIT);
924 if (ia == NULL)
925 return ENOBUFS;
926 bzero((caddr_t)ia, sizeof(*ia));
927 LIST_INIT(&ia->ia6_memberships);
928 /* Initialize the address and masks, and put time stamp */
929 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
930 ia->ia_addr.sin6_family = AF_INET6;
931 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
932 ia->ia6_createtime = time_second;
933 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
934 /*
935 * XXX: some functions expect that ifa_dstaddr is not
936 * NULL for p2p interfaces.
937 */
938 ia->ia_ifa.ifa_dstaddr =
939 (struct sockaddr *)&ia->ia_dstaddr;
940 } else {
941 ia->ia_ifa.ifa_dstaddr = NULL;
942 }
943 ia->ia_ifa.ifa_netmask =
944 (struct sockaddr *)&ia->ia_prefixmask;
945
946 ia->ia_ifp = ifp;
947 if ((oia = in6_ifaddr) != NULL) {
948 for ( ; oia->ia_next; oia = oia->ia_next)
949 continue;
950 oia->ia_next = ia;
951 } else
952 in6_ifaddr = ia;
953 /* gain a refcnt for the link from in6_ifaddr */
954 IFAREF(&ia->ia_ifa);
955
956 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
957 ifa_list);
958 /* gain another refcnt for the link from if_addrlist */
959 IFAREF(&ia->ia_ifa);
960 }
961
962 /* update timestamp */
963 ia->ia6_updatetime = time_second;
964
965 /* set prefix mask */
966 if (ifra->ifra_prefixmask.sin6_len) {
967 /*
968 * We prohibit changing the prefix length of an existing
969 * address, because
970 * + such an operation should be rare in IPv6, and
971 * + the operation would confuse prefix management.
972 */
973 if (ia->ia_prefixmask.sin6_len &&
974 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
975 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
976 " existing (%s) address should not be changed\n",
977 ip6_sprintf(&ia->ia_addr.sin6_addr)));
978 error = EINVAL;
979 goto unlink;
980 }
981 ia->ia_prefixmask = ifra->ifra_prefixmask;
982 }
983
984 /*
985 * If a new destination address is specified, scrub the old one and
986 * install the new destination. Note that the interface must be
987 * p2p or loopback (see the check above.)
988 */
989 if (dst6.sin6_family == AF_INET6 &&
990 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
991 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
992 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) {
993 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
994 "a route to the old destination: %s\n",
995 ip6_sprintf(&ia->ia_addr.sin6_addr)));
996 /* proceed anyway... */
997 } else
998 ia->ia_flags &= ~IFA_ROUTE;
999 ia->ia_dstaddr = dst6;
1000 }
1001
1002 /*
1003 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1004 * to see if the address is deprecated or invalidated, but initialize
1005 * these members for applications.
1006 */
1007 ia->ia6_lifetime = ifra->ifra_lifetime;
1008 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1009 ia->ia6_lifetime.ia6t_expire =
1010 time_second + ia->ia6_lifetime.ia6t_vltime;
1011 } else
1012 ia->ia6_lifetime.ia6t_expire = 0;
1013 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1014 ia->ia6_lifetime.ia6t_preferred =
1015 time_second + ia->ia6_lifetime.ia6t_pltime;
1016 } else
1017 ia->ia6_lifetime.ia6t_preferred = 0;
1018
1019 /* reset the interface and routing table appropriately. */
1020 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1021 goto unlink;
1022
1023 /*
1024 * configure address flags.
1025 */
1026 ia->ia6_flags = ifra->ifra_flags;
1027 /*
1028 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1029 * userland, make it deprecated.
1030 */
1031 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1032 ia->ia6_lifetime.ia6t_pltime = 0;
1033 ia->ia6_lifetime.ia6t_preferred = time_second;
1034 }
1035
1036 /*
1037 * Make the address tentative before joining multicast addresses,
1038 * so that corresponding MLD responses would not have a tentative
1039 * source address.
1040 */
1041 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1042 if (hostIsNew && in6if_do_dad(ifp))
1043 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1044
1045 /*
1046 * We are done if we have simply modified an existing address.
1047 */
1048 if (!hostIsNew)
1049 return error;
1050
1051 /*
1052 * Beyond this point, we should call in6_purgeaddr upon an error,
1053 * not just go to unlink.
1054 */
1055
1056 /* join necessary multicast groups */
1057 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1058 struct sockaddr_in6 mltaddr, mltmask;
1059 struct in6_addr llsol;
1060
1061 /* join solicited multicast addr for new host id */
1062 bzero(&llsol, sizeof(struct in6_addr));
1063 llsol.s6_addr16[0] = htons(0xff02);
1064 llsol.s6_addr32[1] = 0;
1065 llsol.s6_addr32[2] = htonl(1);
1066 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
1067 llsol.s6_addr8[12] = 0xff;
1068 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
1069 /* XXX: should not happen */
1070 log(LOG_ERR, "in6_update_ifa: "
1071 "in6_setscope failed\n");
1072 goto cleanup;
1073 }
1074 dad_delay = 0;
1075 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1076 /*
1077 * We need a random delay for DAD on the address
1078 * being configured. It also means delaying
1079 * transmission of the corresponding MLD report to
1080 * avoid report collision.
1081 * [draft-ietf-ipv6-rfc2462bis-02.txt]
1082 */
1083 dad_delay = arc4random() %
1084 (MAX_RTR_SOLICITATION_DELAY * hz);
1085 }
1086
1087 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
1088 /* join solicited multicast addr for new host id */
1089 imm = in6_joingroup(ifp, &llsol, &error, dad_delay);
1090 if (!imm) {
1091 nd6log((LOG_ERR,
1092 "in6_update_ifa: addmulti "
1093 "failed for %s on %s (errno=%d)\n",
1094 ip6_sprintf(&llsol), if_name(ifp), error));
1095 goto cleanup;
1096 }
1097 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1098 in6m_sol = imm->i6mm_maddr;
1099
1100 bzero(&mltmask, sizeof(mltmask));
1101 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1102 mltmask.sin6_family = AF_INET6;
1103 mltmask.sin6_addr = in6mask32;
1104
1105 /*
1106 * join link-local all-nodes address
1107 */
1108 bzero(&mltaddr, sizeof(mltaddr));
1109 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1110 mltaddr.sin6_family = AF_INET6;
1111 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1112 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1113 0)
1114 goto cleanup; /* XXX: should not fail */
1115
1116 /*
1117 * XXX: do we really need this automatic routes?
1118 * We should probably reconsider this stuff. Most applications
1119 * actually do not need the routes, since they usually specify
1120 * the outgoing interface.
1121 */
1122 rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
1123 if (rt) {
1124 if (memcmp(&mltaddr.sin6_addr,
1125 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1126 MLTMASK_LEN)) {
1127 RTFREE(rt);
1128 rt = NULL;
1129 }
1130 }
1131 if (!rt) {
1132 struct rt_addrinfo info;
1133
1134 bzero(&info, sizeof(info));
1135 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
1136 info.rti_info[RTAX_GATEWAY] =
1137 (struct sockaddr *)&ia->ia_addr;
1138 info.rti_info[RTAX_NETMASK] =
1139 (struct sockaddr *)&mltmask;
1140 info.rti_info[RTAX_IFA] =
1141 (struct sockaddr *)&ia->ia_addr;
1142 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */
1143 info.rti_flags = RTF_UP | RTF_CLONING;
1144 error = rtrequest1(RTM_ADD, &info, NULL);
1145 if (error)
1146 goto cleanup;
1147 } else {
1148 RTFREE(rt);
1149 }
1150 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1151 if (!imm) {
1152 nd6log((LOG_WARNING,
1153 "in6_update_ifa: addmulti failed for "
1154 "%s on %s (errno=%d)\n",
1155 ip6_sprintf(&mltaddr.sin6_addr),
1156 if_name(ifp), error));
1157 goto cleanup;
1158 }
1159 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1160
1161 /*
1162 * join node information group address
1163 */
1164 dad_delay = 0;
1165 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1166 /*
1167 * The spec doesn't say anything about delay for this
1168 * group, but the same logic should apply.
1169 */
1170 dad_delay = arc4random() %
1171 (MAX_RTR_SOLICITATION_DELAY * hz);
1172 }
1173 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) == 0) {
1174 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
1175 dad_delay); /* XXX jinmei */
1176 if (!imm) {
1177 nd6log((LOG_WARNING, "in6_update_ifa: "
1178 "addmulti failed for %s on %s (errno=%d)\n",
1179 ip6_sprintf(&mltaddr.sin6_addr),
1180 if_name(ifp), error));
1181 /* XXX not very fatal, go on... */
1182 } else {
1183 LIST_INSERT_HEAD(&ia->ia6_memberships,
1184 imm, i6mm_chain);
1185 }
1186 }
1187
1188
1189 /*
1190 * join interface-local all-nodes address.
1191 * (ff01::1%ifN, and ff01::%ifN/32)
1192 */
1193 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1194 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
1195 != 0)
1196 goto cleanup; /* XXX: should not fail */
1197
1198 /* XXX: again, do we really need the route? */
1199 rt = rtalloc1((struct sockaddr *)&mltaddr, 0);
1200 if (rt) {
1201 /* 32bit came from "mltmask" */
1202 if (memcmp(&mltaddr.sin6_addr,
1203 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1204 32 / 8)) {
1205 RTFREE(rt);
1206 rt = NULL;
1207 }
1208 }
1209 if (!rt) {
1210 struct rt_addrinfo info;
1211
1212 bzero(&info, sizeof(info));
1213 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr;
1214 info.rti_info[RTAX_GATEWAY] =
1215 (struct sockaddr *)&ia->ia_addr;
1216 info.rti_info[RTAX_NETMASK] =
1217 (struct sockaddr *)&mltmask;
1218 info.rti_info[RTAX_IFA] =
1219 (struct sockaddr *)&ia->ia_addr;
1220 info.rti_flags = RTF_UP | RTF_CLONING;
1221 error = rtrequest1(RTM_ADD, &info, NULL);
1222 if (error)
1223 goto cleanup;
1224 #undef MLTMASK_LEN
1225 } else {
1226 RTFREE(rt);
1227 }
1228 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1229 if (!imm) {
1230 nd6log((LOG_WARNING, "in6_update_ifa: "
1231 "addmulti failed for %s on %s (errno=%d)\n",
1232 ip6_sprintf(&mltaddr.sin6_addr),
1233 if_name(ifp), error));
1234 goto cleanup;
1235 } else {
1236 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1237 }
1238 }
1239
1240 /*
1241 * Perform DAD, if needed.
1242 * XXX It may be of use, if we can administratively
1243 * disable DAD.
1244 */
1245 if (hostIsNew && in6if_do_dad(ifp) &&
1246 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1247 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1248 {
1249 int mindelay, maxdelay;
1250
1251 dad_delay = 0;
1252 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1253 /*
1254 * We need to impose a delay before sending an NS
1255 * for DAD. Check if we also needed a delay for the
1256 * corresponding MLD message. If we did, the delay
1257 * should be larger than the MLD delay (this could be
1258 * relaxed a bit, but this simple logic is at least
1259 * safe).
1260 */
1261 mindelay = 0;
1262 if (in6m_sol != NULL &&
1263 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1264 mindelay = in6m_sol->in6m_timer;
1265 }
1266 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1267 if (maxdelay - mindelay == 0)
1268 dad_delay = 0;
1269 else {
1270 dad_delay =
1271 (arc4random() % (maxdelay - mindelay)) +
1272 mindelay;
1273 }
1274 }
1275 nd6_dad_start((struct ifaddr *)ia, dad_delay);
1276 }
1277
1278 return error;
1279
1280 unlink:
1281 /*
1282 * XXX: if a change of an existing address failed, keep the entry
1283 * anyway.
1284 */
1285 if (hostIsNew)
1286 in6_unlink_ifa(ia, ifp);
1287 return error;
1288
1289 cleanup:
1290 in6_purgeaddr(&ia->ia_ifa);
1291 return error;
1292 }
1293
1294 void
1295 in6_purgeaddr(ifa)
1296 struct ifaddr *ifa;
1297 {
1298 struct ifnet *ifp = ifa->ifa_ifp;
1299 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1300 struct in6_multi_mship *imm;
1301
1302 /* stop DAD processing */
1303 nd6_dad_stop(ifa);
1304
1305 /*
1306 * delete route to the destination of the address being purged.
1307 * The interface must be p2p or loopback in this case.
1308 */
1309 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1310 int e;
1311
1312 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1313 != 0) {
1314 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1315 "a route to the p2p destination: %s on %s, "
1316 "errno=%d\n",
1317 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1318 e);
1319 /* proceed anyway... */
1320 } else
1321 ia->ia_flags &= ~IFA_ROUTE;
1322 }
1323
1324 /* Remove ownaddr's loopback rtentry, if it exists. */
1325 in6_ifremloop(&(ia->ia_ifa));
1326
1327 /*
1328 * leave from multicast groups we have joined for the interface
1329 */
1330 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1331 LIST_REMOVE(imm, i6mm_chain);
1332 in6_leavegroup(imm);
1333 }
1334
1335 in6_unlink_ifa(ia, ifp);
1336 }
1337
1338 static void
1339 in6_unlink_ifa(ia, ifp)
1340 struct in6_ifaddr *ia;
1341 struct ifnet *ifp;
1342 {
1343 struct in6_ifaddr *oia;
1344 int s = splnet();
1345
1346 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1347 /* release a refcnt for the link from if_addrlist */
1348 IFAFREE(&ia->ia_ifa);
1349
1350 oia = ia;
1351 if (oia == (ia = in6_ifaddr))
1352 in6_ifaddr = ia->ia_next;
1353 else {
1354 while (ia->ia_next && (ia->ia_next != oia))
1355 ia = ia->ia_next;
1356 if (ia->ia_next)
1357 ia->ia_next = oia->ia_next;
1358 else {
1359 /* search failed */
1360 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1361 }
1362 }
1363
1364 if (!LIST_EMPTY(&oia->ia6_multiaddrs)) {
1365 /*
1366 * XXX thorpej@NetBSD.org -- if the interface is going
1367 * XXX away, don't save the multicast entries, delete them!
1368 */
1369 if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) {
1370 struct in6_multi *in6m;
1371
1372 while ((in6m =
1373 LIST_FIRST(&oia->ia6_multiaddrs)) != NULL)
1374 in6_delmulti(in6m);
1375 } else
1376 in6_savemkludge(oia);
1377 }
1378
1379 /*
1380 * Release the reference to the base prefix. There should be a
1381 * positive reference.
1382 */
1383 if (oia->ia6_ndpr == NULL) {
1384 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
1385 "%p has no prefix\n", oia));
1386 } else {
1387 oia->ia6_ndpr->ndpr_refcnt--;
1388 oia->ia6_ndpr = NULL;
1389 }
1390
1391 /*
1392 * Also, if the address being removed is autoconf'ed, call
1393 * pfxlist_onlink_check() since the release might affect the status of
1394 * other (detached) addresses.
1395 */
1396 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0)
1397 pfxlist_onlink_check();
1398
1399 /*
1400 * release another refcnt for the link from in6_ifaddr.
1401 * Note that we should decrement the refcnt at least once for all *BSD.
1402 */
1403 IFAFREE(&oia->ia_ifa);
1404
1405 splx(s);
1406 }
1407
1408 void
1409 in6_purgeif(ifp)
1410 struct ifnet *ifp;
1411 {
1412 struct ifaddr *ifa, *nifa;
1413
1414 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) {
1415 nifa = TAILQ_NEXT(ifa, ifa_list);
1416 if (ifa->ifa_addr->sa_family != AF_INET6)
1417 continue;
1418 in6_purgeaddr(ifa);
1419 }
1420
1421 in6_ifdetach(ifp);
1422 }
1423
1424 /*
1425 * SIOC[GAD]LIFADDR.
1426 * SIOCGLIFADDR: get first address. (?)
1427 * SIOCGLIFADDR with IFLR_PREFIX:
1428 * get first address that matches the specified prefix.
1429 * SIOCALIFADDR: add the specified address.
1430 * SIOCALIFADDR with IFLR_PREFIX:
1431 * add the specified prefix, filling hostid part from
1432 * the first link-local address. prefixlen must be <= 64.
1433 * SIOCDLIFADDR: delete the specified address.
1434 * SIOCDLIFADDR with IFLR_PREFIX:
1435 * delete the first address that matches the specified prefix.
1436 * return values:
1437 * EINVAL on invalid parameters
1438 * EADDRNOTAVAIL on prefix match failed/specified address not found
1439 * other values may be returned from in6_ioctl()
1440 *
1441 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1442 * this is to accommodate address naming scheme other than RFC2374,
1443 * in the future.
1444 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1445 * address encoding scheme. (see figure on page 8)
1446 */
1447 static int
1448 in6_lifaddr_ioctl(so, cmd, data, ifp, l)
1449 struct socket *so;
1450 u_long cmd;
1451 caddr_t data;
1452 struct ifnet *ifp;
1453 struct lwp *l;
1454 {
1455 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1456 struct ifaddr *ifa;
1457 struct sockaddr *sa;
1458
1459 /* sanity checks */
1460 if (!data || !ifp) {
1461 panic("invalid argument to in6_lifaddr_ioctl");
1462 /* NOTREACHED */
1463 }
1464
1465 switch (cmd) {
1466 case SIOCGLIFADDR:
1467 /* address must be specified on GET with IFLR_PREFIX */
1468 if ((iflr->flags & IFLR_PREFIX) == 0)
1469 break;
1470 /* FALLTHROUGH */
1471 case SIOCALIFADDR:
1472 case SIOCDLIFADDR:
1473 /* address must be specified on ADD and DELETE */
1474 sa = (struct sockaddr *)&iflr->addr;
1475 if (sa->sa_family != AF_INET6)
1476 return EINVAL;
1477 if (sa->sa_len != sizeof(struct sockaddr_in6))
1478 return EINVAL;
1479 /* XXX need improvement */
1480 sa = (struct sockaddr *)&iflr->dstaddr;
1481 if (sa->sa_family && sa->sa_family != AF_INET6)
1482 return EINVAL;
1483 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1484 return EINVAL;
1485 break;
1486 default: /* shouldn't happen */
1487 #if 0
1488 panic("invalid cmd to in6_lifaddr_ioctl");
1489 /* NOTREACHED */
1490 #else
1491 return EOPNOTSUPP;
1492 #endif
1493 }
1494 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1495 return EINVAL;
1496
1497 switch (cmd) {
1498 case SIOCALIFADDR:
1499 {
1500 struct in6_aliasreq ifra;
1501 struct in6_addr *xhostid = NULL;
1502 int prefixlen;
1503
1504 if ((iflr->flags & IFLR_PREFIX) != 0) {
1505 struct sockaddr_in6 *sin6;
1506
1507 /*
1508 * xhostid is to fill in the hostid part of the
1509 * address. xhostid points to the first link-local
1510 * address attached to the interface.
1511 */
1512 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1513 if (!ifa)
1514 return EADDRNOTAVAIL;
1515 xhostid = IFA_IN6(ifa);
1516
1517 /* prefixlen must be <= 64. */
1518 if (64 < iflr->prefixlen)
1519 return EINVAL;
1520 prefixlen = iflr->prefixlen;
1521
1522 /* hostid part must be zero. */
1523 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1524 if (sin6->sin6_addr.s6_addr32[2] != 0
1525 || sin6->sin6_addr.s6_addr32[3] != 0) {
1526 return EINVAL;
1527 }
1528 } else
1529 prefixlen = iflr->prefixlen;
1530
1531 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1532 bzero(&ifra, sizeof(ifra));
1533 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1534
1535 bcopy(&iflr->addr, &ifra.ifra_addr,
1536 ((struct sockaddr *)&iflr->addr)->sa_len);
1537 if (xhostid) {
1538 /* fill in hostid part */
1539 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1540 xhostid->s6_addr32[2];
1541 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1542 xhostid->s6_addr32[3];
1543 }
1544
1545 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1546 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1547 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1548 if (xhostid) {
1549 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1550 xhostid->s6_addr32[2];
1551 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1552 xhostid->s6_addr32[3];
1553 }
1554 }
1555
1556 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1557 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1558
1559 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1560 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
1561 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1562 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, l);
1563 }
1564 case SIOCGLIFADDR:
1565 case SIOCDLIFADDR:
1566 {
1567 struct in6_ifaddr *ia;
1568 struct in6_addr mask, candidate, match;
1569 struct sockaddr_in6 *sin6;
1570 int cmp;
1571
1572 bzero(&mask, sizeof(mask));
1573 if (iflr->flags & IFLR_PREFIX) {
1574 /* lookup a prefix rather than address. */
1575 in6_prefixlen2mask(&mask, iflr->prefixlen);
1576
1577 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1578 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1579 match.s6_addr32[0] &= mask.s6_addr32[0];
1580 match.s6_addr32[1] &= mask.s6_addr32[1];
1581 match.s6_addr32[2] &= mask.s6_addr32[2];
1582 match.s6_addr32[3] &= mask.s6_addr32[3];
1583
1584 /* if you set extra bits, that's wrong */
1585 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1586 return EINVAL;
1587
1588 cmp = 1;
1589 } else {
1590 if (cmd == SIOCGLIFADDR) {
1591 /* on getting an address, take the 1st match */
1592 cmp = 0; /* XXX */
1593 } else {
1594 /* on deleting an address, do exact match */
1595 in6_prefixlen2mask(&mask, 128);
1596 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1597 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1598
1599 cmp = 1;
1600 }
1601 }
1602
1603 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1604 if (ifa->ifa_addr->sa_family != AF_INET6)
1605 continue;
1606 if (!cmp)
1607 break;
1608
1609 /*
1610 * XXX: this is adhoc, but is necessary to allow
1611 * a user to specify fe80::/64 (not /10) for a
1612 * link-local address.
1613 */
1614 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1615 in6_clearscope(&candidate);
1616 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1617 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1618 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1619 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1620 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1621 break;
1622 }
1623 if (!ifa)
1624 return EADDRNOTAVAIL;
1625 ia = ifa2ia6(ifa);
1626
1627 if (cmd == SIOCGLIFADDR) {
1628 int error;
1629
1630 /* fill in the if_laddrreq structure */
1631 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1632 error = sa6_recoverscope(
1633 (struct sockaddr_in6 *)&iflr->addr);
1634 if (error != 0)
1635 return error;
1636
1637 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1638 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1639 ia->ia_dstaddr.sin6_len);
1640 error = sa6_recoverscope(
1641 (struct sockaddr_in6 *)&iflr->dstaddr);
1642 if (error != 0)
1643 return error;
1644 } else
1645 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1646
1647 iflr->prefixlen =
1648 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1649
1650 iflr->flags = ia->ia6_flags; /* XXX */
1651
1652 return 0;
1653 } else {
1654 struct in6_aliasreq ifra;
1655
1656 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1657 bzero(&ifra, sizeof(ifra));
1658 bcopy(iflr->iflr_name, ifra.ifra_name,
1659 sizeof(ifra.ifra_name));
1660
1661 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1662 ia->ia_addr.sin6_len);
1663 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1664 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1665 ia->ia_dstaddr.sin6_len);
1666 } else {
1667 bzero(&ifra.ifra_dstaddr,
1668 sizeof(ifra.ifra_dstaddr));
1669 }
1670 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1671 ia->ia_prefixmask.sin6_len);
1672
1673 ifra.ifra_flags = ia->ia6_flags;
1674 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1675 ifp, l);
1676 }
1677 }
1678 }
1679
1680 return EOPNOTSUPP; /* just for safety */
1681 }
1682
1683 /*
1684 * Initialize an interface's internet6 address
1685 * and routing table entry.
1686 */
1687 static int
1688 in6_ifinit(ifp, ia, sin6, newhost)
1689 struct ifnet *ifp;
1690 struct in6_ifaddr *ia;
1691 struct sockaddr_in6 *sin6;
1692 int newhost;
1693 {
1694 int error = 0, plen, ifacount = 0;
1695 int s = splnet();
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 == NULL)
1705 continue; /* just for safety */
1706 if (ifa->ifa_addr->sa_family != AF_INET6)
1707 continue;
1708 ifacount++;
1709 }
1710
1711 ia->ia_addr = *sin6;
1712
1713 if (ifacount <= 1 && ifp->if_ioctl &&
1714 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
1715 splx(s);
1716 return error;
1717 }
1718 splx(s);
1719
1720 ia->ia_ifa.ifa_metric = ifp->if_metric;
1721
1722 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1723
1724 /*
1725 * Special case:
1726 * If the destination address is specified for a point-to-point
1727 * interface, install a route to the destination as an interface
1728 * direct route.
1729 */
1730 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1731 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
1732 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
1733 RTF_UP | RTF_HOST)) != 0)
1734 return error;
1735 ia->ia_flags |= IFA_ROUTE;
1736 }
1737
1738 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1739 if (newhost) {
1740 /* set the rtrequest function to create llinfo */
1741 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1742 in6_ifaddloop(&(ia->ia_ifa));
1743 }
1744
1745 if (ifp->if_flags & IFF_MULTICAST)
1746 in6_restoremkludge(ia, ifp);
1747
1748 return error;
1749 }
1750
1751 /*
1752 * Find an IPv6 interface link-local address specific to an interface.
1753 */
1754 struct in6_ifaddr *
1755 in6ifa_ifpforlinklocal(ifp, ignoreflags)
1756 struct ifnet *ifp;
1757 int ignoreflags;
1758 {
1759 struct ifaddr *ifa;
1760
1761 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1762 if (ifa->ifa_addr == NULL)
1763 continue; /* just for safety */
1764 if (ifa->ifa_addr->sa_family != AF_INET6)
1765 continue;
1766 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1767 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1768 ignoreflags) != 0)
1769 continue;
1770 break;
1771 }
1772 }
1773
1774 return (struct in6_ifaddr *)ifa;
1775 }
1776
1777
1778 /*
1779 * find the internet address corresponding to a given interface and address.
1780 */
1781 struct in6_ifaddr *
1782 in6ifa_ifpwithaddr(ifp, addr)
1783 struct ifnet *ifp;
1784 struct in6_addr *addr;
1785 {
1786 struct ifaddr *ifa;
1787
1788 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1789 if (ifa->ifa_addr == NULL)
1790 continue; /* just for safety */
1791 if (ifa->ifa_addr->sa_family != AF_INET6)
1792 continue;
1793 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1794 break;
1795 }
1796
1797 return (struct in6_ifaddr *)ifa;
1798 }
1799
1800 /*
1801 * find the internet address on a given interface corresponding to a neighbor's
1802 * address.
1803 */
1804 struct in6_ifaddr *
1805 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr)
1806 {
1807 struct ifaddr *ifa;
1808 struct in6_ifaddr *ia;
1809
1810 IFADDR_FOREACH(ifa, ifp) {
1811 if (ifa->ifa_addr == NULL)
1812 continue; /* just for safety */
1813 if (ifa->ifa_addr->sa_family != AF_INET6)
1814 continue;
1815 ia = (struct in6_ifaddr *)ifa;
1816 if (IN6_ARE_MASKED_ADDR_EQUAL(addr,
1817 &ia->ia_addr.sin6_addr,
1818 &ia->ia_prefixmask.sin6_addr))
1819 return ia;
1820 }
1821
1822 return NULL;
1823 }
1824
1825 /*
1826 * Convert IP6 address to printable (loggable) representation.
1827 */
1828 static int ip6round = 0;
1829 char *
1830 ip6_sprintf(addr)
1831 const struct in6_addr *addr;
1832 {
1833 static char ip6buf[8][48];
1834 int i;
1835 char *cp;
1836 const u_int16_t *a = (const u_int16_t *)addr;
1837 const u_int8_t *d;
1838 int dcolon = 0;
1839
1840 ip6round = (ip6round + 1) & 7;
1841 cp = ip6buf[ip6round];
1842
1843 for (i = 0; i < 8; i++) {
1844 if (dcolon == 1) {
1845 if (*a == 0) {
1846 if (i == 7)
1847 *cp++ = ':';
1848 a++;
1849 continue;
1850 } else
1851 dcolon = 2;
1852 }
1853 if (*a == 0) {
1854 if (dcolon == 0 && *(a + 1) == 0) {
1855 if (i == 0)
1856 *cp++ = ':';
1857 *cp++ = ':';
1858 dcolon = 1;
1859 } else {
1860 *cp++ = '';
1861 *cp++ = ':';
1862 }
1863 a++;
1864 continue;
1865 }
1866 d = (const u_char *)a;
1867 *cp++ = hexdigits[*d >> 4];
1868 *cp++ = hexdigits[*d++ & 0xf];
1869 *cp++ = hexdigits[*d >> 4];
1870 *cp++ = hexdigits[*d & 0xf];
1871 *cp++ = ':';
1872 a++;
1873 }
1874 *--cp = 0;
1875 return ip6buf[ip6round];
1876 }
1877
1878 /*
1879 * Determine if an address is on a local network.
1880 */
1881 int
1882 in6_localaddr(in6)
1883 struct in6_addr *in6;
1884 {
1885 struct in6_ifaddr *ia;
1886
1887 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1888 return 1;
1889
1890 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
1891 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1892 &ia->ia_prefixmask.sin6_addr))
1893 return 1;
1894
1895 return 0;
1896 }
1897
1898 int
1899 in6_is_addr_deprecated(sa6)
1900 struct sockaddr_in6 *sa6;
1901 {
1902 struct in6_ifaddr *ia;
1903
1904 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1905 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1906 &sa6->sin6_addr) &&
1907 #ifdef SCOPEDROUTING
1908 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
1909 #endif
1910 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1911 return 1; /* true */
1912
1913 /* XXX: do we still have to go thru the rest of the list? */
1914 }
1915
1916 return 0; /* false */
1917 }
1918
1919 /*
1920 * return length of part which dst and src are equal
1921 * hard coding...
1922 */
1923 int
1924 in6_matchlen(src, dst)
1925 struct in6_addr *src, *dst;
1926 {
1927 int match = 0;
1928 u_char *s = (u_char *)src, *d = (u_char *)dst;
1929 u_char *lim = s + 16, r;
1930
1931 while (s < lim)
1932 if ((r = (*d++ ^ *s++)) != 0) {
1933 while (r < 128) {
1934 match++;
1935 r <<= 1;
1936 }
1937 break;
1938 } else
1939 match += 8;
1940 return match;
1941 }
1942
1943 /* XXX: to be scope conscious */
1944 int
1945 in6_are_prefix_equal(p1, p2, len)
1946 struct in6_addr *p1, *p2;
1947 int len;
1948 {
1949 int bytelen, bitlen;
1950
1951 /* sanity check */
1952 if (len < 0 || len > 128) {
1953 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1954 len);
1955 return 0;
1956 }
1957
1958 bytelen = len / 8;
1959 bitlen = len % 8;
1960
1961 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1962 return 0;
1963 if (bitlen != 0 &&
1964 p1->s6_addr[bytelen] >> (8 - bitlen) !=
1965 p2->s6_addr[bytelen] >> (8 - bitlen))
1966 return 0;
1967
1968 return 1;
1969 }
1970
1971 void
1972 in6_prefixlen2mask(maskp, len)
1973 struct in6_addr *maskp;
1974 int len;
1975 {
1976 static const u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1977 int bytelen, bitlen, i;
1978
1979 /* sanity check */
1980 if (len < 0 || len > 128) {
1981 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1982 len);
1983 return;
1984 }
1985
1986 bzero(maskp, sizeof(*maskp));
1987 bytelen = len / 8;
1988 bitlen = len % 8;
1989 for (i = 0; i < bytelen; i++)
1990 maskp->s6_addr[i] = 0xff;
1991 if (bitlen)
1992 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1993 }
1994
1995 /*
1996 * return the best address out of the same scope. if no address was
1997 * found, return the first valid address from designated IF.
1998 */
1999 struct in6_ifaddr *
2000 in6_ifawithifp(ifp, dst)
2001 struct ifnet *ifp;
2002 struct in6_addr *dst;
2003 {
2004 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2005 struct ifaddr *ifa;
2006 struct in6_ifaddr *besta = 0;
2007 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2008
2009 dep[0] = dep[1] = NULL;
2010
2011 /*
2012 * We first look for addresses in the same scope.
2013 * If there is one, return it.
2014 * If two or more, return one which matches the dst longest.
2015 * If none, return one of global addresses assigned other ifs.
2016 */
2017 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2018 if (ifa->ifa_addr->sa_family != AF_INET6)
2019 continue;
2020 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2021 continue; /* XXX: is there any case to allow anycast? */
2022 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2023 continue; /* don't use this interface */
2024 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2025 continue;
2026 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2027 if (ip6_use_deprecated)
2028 dep[0] = (struct in6_ifaddr *)ifa;
2029 continue;
2030 }
2031
2032 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2033 /*
2034 * call in6_matchlen() as few as possible
2035 */
2036 if (besta) {
2037 if (blen == -1)
2038 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2039 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2040 if (tlen > blen) {
2041 blen = tlen;
2042 besta = (struct in6_ifaddr *)ifa;
2043 }
2044 } else
2045 besta = (struct in6_ifaddr *)ifa;
2046 }
2047 }
2048 if (besta)
2049 return besta;
2050
2051 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2052 if (ifa->ifa_addr->sa_family != AF_INET6)
2053 continue;
2054 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2055 continue; /* XXX: is there any case to allow anycast? */
2056 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2057 continue; /* don't use this interface */
2058 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2059 continue;
2060 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2061 if (ip6_use_deprecated)
2062 dep[1] = (struct in6_ifaddr *)ifa;
2063 continue;
2064 }
2065
2066 return (struct in6_ifaddr *)ifa;
2067 }
2068
2069 /* use the last-resort values, that are, deprecated addresses */
2070 if (dep[0])
2071 return dep[0];
2072 if (dep[1])
2073 return dep[1];
2074
2075 return NULL;
2076 }
2077
2078 /*
2079 * perform DAD when interface becomes IFF_UP.
2080 */
2081 void
2082 in6_if_up(ifp)
2083 struct ifnet *ifp;
2084 {
2085 struct ifaddr *ifa;
2086 struct in6_ifaddr *ia;
2087
2088 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
2089 if (ifa->ifa_addr->sa_family != AF_INET6)
2090 continue;
2091 ia = (struct in6_ifaddr *)ifa;
2092 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2093 /*
2094 * The TENTATIVE flag was likely set by hand
2095 * beforehand, implicitly indicating the need for DAD.
2096 * We may be able to skip the random delay in this
2097 * case, but we impose delays just in case.
2098 */
2099 nd6_dad_start(ifa,
2100 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2101 }
2102 }
2103
2104 /*
2105 * special cases, like 6to4, are handled in in6_ifattach
2106 */
2107 in6_ifattach(ifp, NULL);
2108 }
2109
2110 int
2111 in6if_do_dad(ifp)
2112 struct ifnet *ifp;
2113 {
2114 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2115 return 0;
2116
2117 switch (ifp->if_type) {
2118 case IFT_FAITH:
2119 /*
2120 * These interfaces do not have the IFF_LOOPBACK flag,
2121 * but loop packets back. We do not have to do DAD on such
2122 * interfaces. We should even omit it, because loop-backed
2123 * NS would confuse the DAD procedure.
2124 */
2125 return 0;
2126 default:
2127 /*
2128 * Our DAD routine requires the interface up and running.
2129 * However, some interfaces can be up before the RUNNING
2130 * status. Additionaly, users may try to assign addresses
2131 * before the interface becomes up (or running).
2132 * We simply skip DAD in such a case as a work around.
2133 * XXX: we should rather mark "tentative" on such addresses,
2134 * and do DAD after the interface becomes ready.
2135 */
2136 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
2137 (IFF_UP|IFF_RUNNING))
2138 return 0;
2139
2140 return 1;
2141 }
2142 }
2143
2144 /*
2145 * Calculate max IPv6 MTU through all the interfaces and store it
2146 * to in6_maxmtu.
2147 */
2148 void
2149 in6_setmaxmtu()
2150 {
2151 unsigned long maxmtu = 0;
2152 struct ifnet *ifp;
2153
2154 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2155 {
2156 /* this function can be called during ifnet initialization */
2157 if (!ifp->if_afdata[AF_INET6])
2158 continue;
2159 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2160 IN6_LINKMTU(ifp) > maxmtu)
2161 maxmtu = IN6_LINKMTU(ifp);
2162 }
2163 if (maxmtu) /* update only when maxmtu is positive */
2164 in6_maxmtu = maxmtu;
2165 }
2166
2167 /*
2168 * Provide the length of interface identifiers to be used for the link attached
2169 * to the given interface. The length should be defined in "IPv6 over
2170 * xxx-link" document. Note that address architecture might also define
2171 * the length for a particular set of address prefixes, regardless of the
2172 * link type. As clarified in rfc2462bis, those two definitions should be
2173 * consistent, and those really are as of August 2004.
2174 */
2175 int
2176 in6_if2idlen(ifp)
2177 struct ifnet *ifp;
2178 {
2179 switch (ifp->if_type) {
2180 case IFT_ETHER: /* RFC2464 */
2181 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2182 case IFT_L2VLAN: /* ditto */
2183 case IFT_IEEE80211: /* ditto */
2184 case IFT_FDDI: /* RFC2467 */
2185 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2186 case IFT_PPP: /* RFC2472 */
2187 case IFT_ARCNET: /* RFC2497 */
2188 case IFT_FRELAY: /* RFC2590 */
2189 case IFT_IEEE1394: /* RFC3146 */
2190 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */
2191 case IFT_LOOP: /* XXX: is this really correct? */
2192 return 64;
2193 default:
2194 /*
2195 * Unknown link type:
2196 * It might be controversial to use the today's common constant
2197 * of 64 for these cases unconditionally. For full compliance,
2198 * we should return an error in this case. On the other hand,
2199 * if we simply miss the standard for the link type or a new
2200 * standard is defined for a new link type, the IFID length
2201 * is very likely to be the common constant. As a compromise,
2202 * we always use the constant, but make an explicit notice
2203 * indicating the "unknown" case.
2204 */
2205 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2206 return 64;
2207 }
2208 }
2209
2210 void *
2211 in6_domifattach(ifp)
2212 struct ifnet *ifp;
2213 {
2214 struct in6_ifextra *ext;
2215
2216 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2217 bzero(ext, sizeof(*ext));
2218
2219 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2220 M_IFADDR, M_WAITOK);
2221 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2222
2223 ext->icmp6_ifstat =
2224 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2225 M_IFADDR, M_WAITOK);
2226 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2227
2228 ext->nd_ifinfo = nd6_ifattach(ifp);
2229 ext->scope6_id = scope6_ifattach(ifp);
2230 return ext;
2231 }
2232
2233 void
2234 in6_domifdetach(struct ifnet *ifp, void *aux)
2235 {
2236 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2237
2238 nd6_ifdetach(ext->nd_ifinfo);
2239 free(ext->in6_ifstat, M_IFADDR);
2240 free(ext->icmp6_ifstat, M_IFADDR);
2241 scope6_ifdetach(ext->scope6_id);
2242 free(ext, M_IFADDR);
2243 }
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