FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in.c 8.2 (Berkeley) 11/15/93
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
65
66 #include "opt_compat.h"
67 #include "opt_inet.h"
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/errno.h>
72 #include <sys/jail.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/priv.h>
79 #include <sys/proc.h>
80 #include <sys/time.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83
84 #include <net/if.h>
85 #include <net/if_var.h>
86 #include <net/if_types.h>
87 #include <net/route.h>
88 #include <net/if_dl.h>
89 #include <net/vnet.h>
90
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <net/if_llatbl.h>
94 #include <netinet/if_ether.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/ip.h>
97 #include <netinet/in_pcb.h>
98
99 #include <netinet/ip6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/nd6.h>
102 #include <netinet6/mld6_var.h>
103 #include <netinet6/ip6_mroute.h>
104 #include <netinet6/in6_ifattach.h>
105 #include <netinet6/scope6_var.h>
106 #include <netinet6/in6_pcb.h>
107
108 /*
109 * Definitions of some costant IP6 addresses.
110 */
111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
113 const struct in6_addr in6addr_nodelocal_allnodes =
114 IN6ADDR_NODELOCAL_ALLNODES_INIT;
115 const struct in6_addr in6addr_linklocal_allnodes =
116 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
117 const struct in6_addr in6addr_linklocal_allrouters =
118 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
119 const struct in6_addr in6addr_linklocal_allv2routers =
120 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
121
122 const struct in6_addr in6mask0 = IN6MASK0;
123 const struct in6_addr in6mask32 = IN6MASK32;
124 const struct in6_addr in6mask64 = IN6MASK64;
125 const struct in6_addr in6mask96 = IN6MASK96;
126 const struct in6_addr in6mask128 = IN6MASK128;
127
128 const struct sockaddr_in6 sa6_any =
129 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
130
131 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
132 struct ifnet *, struct thread *));
133 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
134 struct sockaddr_in6 *, int));
135 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
136
137 int (*faithprefix_p)(struct in6_addr *);
138
139
140
141 int
142 in6_mask2len(struct in6_addr *mask, u_char *lim0)
143 {
144 int x = 0, y;
145 u_char *lim = lim0, *p;
146
147 /* ignore the scope_id part */
148 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
149 lim = (u_char *)mask + sizeof(*mask);
150 for (p = (u_char *)mask; p < lim; x++, p++) {
151 if (*p != 0xff)
152 break;
153 }
154 y = 0;
155 if (p < lim) {
156 for (y = 0; y < 8; y++) {
157 if ((*p & (0x80 >> y)) == 0)
158 break;
159 }
160 }
161
162 /*
163 * when the limit pointer is given, do a stricter check on the
164 * remaining bits.
165 */
166 if (p < lim) {
167 if (y != 0 && (*p & (0x00ff >> y)) != 0)
168 return (-1);
169 for (p = p + 1; p < lim; p++)
170 if (*p != 0)
171 return (-1);
172 }
173
174 return x * 8 + y;
175 }
176
177 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
178 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
179
180 #ifdef COMPAT_FREEBSD32
181 struct in6_ndifreq32 {
182 char ifname[IFNAMSIZ];
183 uint32_t ifindex;
184 };
185 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
186 #endif
187
188 int
189 in6_control(struct socket *so, u_long cmd, caddr_t data,
190 struct ifnet *ifp, struct thread *td)
191 {
192 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
193 struct in6_ifaddr *ia = NULL;
194 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
195 struct sockaddr_in6 *sa6;
196 int error;
197
198 switch (cmd) {
199 case SIOCGETSGCNT_IN6:
200 case SIOCGETMIFCNT_IN6:
201 /*
202 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
203 * We cannot see how that would be needed, so do not adjust the
204 * KPI blindly; more likely should clean up the IPv4 variant.
205 */
206 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
207 }
208
209 switch(cmd) {
210 case SIOCAADDRCTL_POLICY:
211 case SIOCDADDRCTL_POLICY:
212 if (td != NULL) {
213 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
214 if (error)
215 return (error);
216 }
217 return (in6_src_ioctl(cmd, data));
218 }
219
220 if (ifp == NULL)
221 return (EOPNOTSUPP);
222
223 switch (cmd) {
224 case SIOCSNDFLUSH_IN6:
225 case SIOCSPFXFLUSH_IN6:
226 case SIOCSRTRFLUSH_IN6:
227 case SIOCSDEFIFACE_IN6:
228 case SIOCSIFINFO_FLAGS:
229 case SIOCSIFINFO_IN6:
230 if (td != NULL) {
231 error = priv_check(td, PRIV_NETINET_ND6);
232 if (error)
233 return (error);
234 }
235 /* FALLTHROUGH */
236 case OSIOCGIFINFO_IN6:
237 case SIOCGIFINFO_IN6:
238 case SIOCGDRLST_IN6:
239 case SIOCGPRLST_IN6:
240 case SIOCGNBRINFO_IN6:
241 case SIOCGDEFIFACE_IN6:
242 return (nd6_ioctl(cmd, data, ifp));
243
244 #ifdef COMPAT_FREEBSD32
245 case SIOCGDEFIFACE32_IN6:
246 {
247 struct in6_ndifreq ndif;
248 struct in6_ndifreq32 *ndif32;
249
250 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
251 ifp);
252 if (error)
253 return (error);
254 ndif32 = (struct in6_ndifreq32 *)data;
255 ndif32->ifindex = ndif.ifindex;
256 return (0);
257 }
258 #endif
259 }
260
261 switch (cmd) {
262 case SIOCSIFPREFIX_IN6:
263 case SIOCDIFPREFIX_IN6:
264 case SIOCAIFPREFIX_IN6:
265 case SIOCCIFPREFIX_IN6:
266 case SIOCSGIFPREFIX_IN6:
267 case SIOCGIFPREFIX_IN6:
268 log(LOG_NOTICE,
269 "prefix ioctls are now invalidated. "
270 "please use ifconfig.\n");
271 return (EOPNOTSUPP);
272 }
273
274 switch (cmd) {
275 case SIOCSSCOPE6:
276 if (td != NULL) {
277 error = priv_check(td, PRIV_NETINET_SCOPE6);
278 if (error)
279 return (error);
280 }
281 return (scope6_set(ifp,
282 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
283 case SIOCGSCOPE6:
284 return (scope6_get(ifp,
285 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
286 case SIOCGSCOPE6DEF:
287 return (scope6_get_default((struct scope6_id *)
288 ifr->ifr_ifru.ifru_scope_id));
289 }
290
291 switch (cmd) {
292 case SIOCALIFADDR:
293 if (td != NULL) {
294 error = priv_check(td, PRIV_NET_ADDIFADDR);
295 if (error)
296 return (error);
297 }
298 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
299
300 case SIOCDLIFADDR:
301 if (td != NULL) {
302 error = priv_check(td, PRIV_NET_DELIFADDR);
303 if (error)
304 return (error);
305 }
306 /* FALLTHROUGH */
307 case SIOCGLIFADDR:
308 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
309 }
310
311 /*
312 * Find address for this interface, if it exists.
313 *
314 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
315 * only, and used the first interface address as the target of other
316 * operations (without checking ifra_addr). This was because netinet
317 * code/API assumed at most 1 interface address per interface.
318 * Since IPv6 allows a node to assign multiple addresses
319 * on a single interface, we almost always look and check the
320 * presence of ifra_addr, and reject invalid ones here.
321 * It also decreases duplicated code among SIOC*_IN6 operations.
322 */
323 switch (cmd) {
324 case SIOCAIFADDR_IN6:
325 case SIOCSIFPHYADDR_IN6:
326 sa6 = &ifra->ifra_addr;
327 break;
328 case SIOCSIFADDR_IN6:
329 case SIOCGIFADDR_IN6:
330 case SIOCSIFDSTADDR_IN6:
331 case SIOCSIFNETMASK_IN6:
332 case SIOCGIFDSTADDR_IN6:
333 case SIOCGIFNETMASK_IN6:
334 case SIOCDIFADDR_IN6:
335 case SIOCGIFPSRCADDR_IN6:
336 case SIOCGIFPDSTADDR_IN6:
337 case SIOCGIFAFLAG_IN6:
338 case SIOCSNDFLUSH_IN6:
339 case SIOCSPFXFLUSH_IN6:
340 case SIOCSRTRFLUSH_IN6:
341 case SIOCGIFALIFETIME_IN6:
342 case SIOCSIFALIFETIME_IN6:
343 case SIOCGIFSTAT_IN6:
344 case SIOCGIFSTAT_ICMP6:
345 sa6 = &ifr->ifr_addr;
346 break;
347 case SIOCSIFADDR:
348 case SIOCSIFBRDADDR:
349 case SIOCSIFDSTADDR:
350 case SIOCSIFNETMASK:
351 /*
352 * Although we should pass any non-INET6 ioctl requests
353 * down to driver, we filter some legacy INET requests.
354 * Drivers trust SIOCSIFADDR et al to come from an already
355 * privileged layer, and do not perform any credentials
356 * checks or input validation.
357 */
358 return (EINVAL);
359 default:
360 sa6 = NULL;
361 break;
362 }
363 if (sa6 && sa6->sin6_family == AF_INET6) {
364 if (sa6->sin6_scope_id != 0)
365 error = sa6_embedscope(sa6, 0);
366 else
367 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
368 if (error != 0)
369 return (error);
370 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
371 &sa6->sin6_addr)) != 0)
372 return (error);
373 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
374 } else
375 ia = NULL;
376
377 switch (cmd) {
378 case SIOCSIFADDR_IN6:
379 case SIOCSIFDSTADDR_IN6:
380 case SIOCSIFNETMASK_IN6:
381 /*
382 * Since IPv6 allows a node to assign multiple addresses
383 * on a single interface, SIOCSIFxxx ioctls are deprecated.
384 */
385 /* we decided to obsolete this command (20000704) */
386 error = EINVAL;
387 goto out;
388
389 case SIOCDIFADDR_IN6:
390 /*
391 * for IPv4, we look for existing in_ifaddr here to allow
392 * "ifconfig if0 delete" to remove the first IPv4 address on
393 * the interface. For IPv6, as the spec allows multiple
394 * interface address from the day one, we consider "remove the
395 * first one" semantics to be not preferable.
396 */
397 if (ia == NULL) {
398 error = EADDRNOTAVAIL;
399 goto out;
400 }
401 /* FALLTHROUGH */
402 case SIOCAIFADDR_IN6:
403 /*
404 * We always require users to specify a valid IPv6 address for
405 * the corresponding operation.
406 */
407 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
408 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
409 error = EAFNOSUPPORT;
410 goto out;
411 }
412
413 if (td != NULL) {
414 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
415 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
416 if (error)
417 goto out;
418 }
419 break;
420
421 case SIOCGIFADDR_IN6:
422 /* This interface is basically deprecated. use SIOCGIFCONF. */
423 /* FALLTHROUGH */
424 case SIOCGIFAFLAG_IN6:
425 case SIOCGIFNETMASK_IN6:
426 case SIOCGIFDSTADDR_IN6:
427 case SIOCGIFALIFETIME_IN6:
428 /* must think again about its semantics */
429 if (ia == NULL) {
430 error = EADDRNOTAVAIL;
431 goto out;
432 }
433 break;
434
435 case SIOCSIFALIFETIME_IN6:
436 {
437 struct in6_addrlifetime *lt;
438
439 if (td != NULL) {
440 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
441 if (error)
442 goto out;
443 }
444 if (ia == NULL) {
445 error = EADDRNOTAVAIL;
446 goto out;
447 }
448 /* sanity for overflow - beware unsigned */
449 lt = &ifr->ifr_ifru.ifru_lifetime;
450 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
451 lt->ia6t_vltime + time_second < time_second) {
452 error = EINVAL;
453 goto out;
454 }
455 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
456 lt->ia6t_pltime + time_second < time_second) {
457 error = EINVAL;
458 goto out;
459 }
460 break;
461 }
462 }
463
464 switch (cmd) {
465 case SIOCGIFADDR_IN6:
466 ifr->ifr_addr = ia->ia_addr;
467 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
468 goto out;
469 break;
470
471 case SIOCGIFDSTADDR_IN6:
472 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
473 error = EINVAL;
474 goto out;
475 }
476 /*
477 * XXX: should we check if ifa_dstaddr is NULL and return
478 * an error?
479 */
480 ifr->ifr_dstaddr = ia->ia_dstaddr;
481 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
482 goto out;
483 break;
484
485 case SIOCGIFNETMASK_IN6:
486 ifr->ifr_addr = ia->ia_prefixmask;
487 break;
488
489 case SIOCGIFAFLAG_IN6:
490 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
491 break;
492
493 case SIOCGIFSTAT_IN6:
494 if (ifp == NULL) {
495 error = EINVAL;
496 goto out;
497 }
498 bzero(&ifr->ifr_ifru.ifru_stat,
499 sizeof(ifr->ifr_ifru.ifru_stat));
500 ifr->ifr_ifru.ifru_stat =
501 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
502 break;
503
504 case SIOCGIFSTAT_ICMP6:
505 if (ifp == NULL) {
506 error = EINVAL;
507 goto out;
508 }
509 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
510 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
511 ifr->ifr_ifru.ifru_icmp6stat =
512 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
513 break;
514
515 case SIOCGIFALIFETIME_IN6:
516 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
517 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
518 time_t maxexpire;
519 struct in6_addrlifetime *retlt =
520 &ifr->ifr_ifru.ifru_lifetime;
521
522 /*
523 * XXX: adjust expiration time assuming time_t is
524 * signed.
525 */
526 maxexpire = (-1) &
527 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
528 if (ia->ia6_lifetime.ia6t_vltime <
529 maxexpire - ia->ia6_updatetime) {
530 retlt->ia6t_expire = ia->ia6_updatetime +
531 ia->ia6_lifetime.ia6t_vltime;
532 } else
533 retlt->ia6t_expire = maxexpire;
534 }
535 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
536 time_t maxexpire;
537 struct in6_addrlifetime *retlt =
538 &ifr->ifr_ifru.ifru_lifetime;
539
540 /*
541 * XXX: adjust expiration time assuming time_t is
542 * signed.
543 */
544 maxexpire = (-1) &
545 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
546 if (ia->ia6_lifetime.ia6t_pltime <
547 maxexpire - ia->ia6_updatetime) {
548 retlt->ia6t_preferred = ia->ia6_updatetime +
549 ia->ia6_lifetime.ia6t_pltime;
550 } else
551 retlt->ia6t_preferred = maxexpire;
552 }
553 break;
554
555 case SIOCSIFALIFETIME_IN6:
556 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
557 /* for sanity */
558 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
559 ia->ia6_lifetime.ia6t_expire =
560 time_second + ia->ia6_lifetime.ia6t_vltime;
561 } else
562 ia->ia6_lifetime.ia6t_expire = 0;
563 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
564 ia->ia6_lifetime.ia6t_preferred =
565 time_second + ia->ia6_lifetime.ia6t_pltime;
566 } else
567 ia->ia6_lifetime.ia6t_preferred = 0;
568 break;
569
570 case SIOCAIFADDR_IN6:
571 {
572 int i;
573 struct nd_prefixctl pr0;
574 struct nd_prefix *pr;
575
576 /*
577 * first, make or update the interface address structure,
578 * and link it to the list.
579 */
580 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
581 goto out;
582 if (ia != NULL)
583 ifa_free(&ia->ia_ifa);
584 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
585 == NULL) {
586 /*
587 * this can happen when the user specify the 0 valid
588 * lifetime.
589 */
590 break;
591 }
592
593 /*
594 * then, make the prefix on-link on the interface.
595 * XXX: we'd rather create the prefix before the address, but
596 * we need at least one address to install the corresponding
597 * interface route, so we configure the address first.
598 */
599
600 /*
601 * convert mask to prefix length (prefixmask has already
602 * been validated in in6_update_ifa().
603 */
604 bzero(&pr0, sizeof(pr0));
605 pr0.ndpr_ifp = ifp;
606 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
607 NULL);
608 if (pr0.ndpr_plen == 128) {
609 break; /* we don't need to install a host route. */
610 }
611 pr0.ndpr_prefix = ifra->ifra_addr;
612 /* apply the mask for safety. */
613 for (i = 0; i < 4; i++) {
614 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
615 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
616 }
617 /*
618 * XXX: since we don't have an API to set prefix (not address)
619 * lifetimes, we just use the same lifetimes as addresses.
620 * The (temporarily) installed lifetimes can be overridden by
621 * later advertised RAs (when accept_rtadv is non 0), which is
622 * an intended behavior.
623 */
624 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
625 pr0.ndpr_raf_auto =
626 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
627 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
628 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
629
630 /* add the prefix if not yet. */
631 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
632 /*
633 * nd6_prelist_add will install the corresponding
634 * interface route.
635 */
636 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
637 goto out;
638 if (pr == NULL) {
639 log(LOG_ERR, "nd6_prelist_add succeeded but "
640 "no prefix\n");
641 error = EINVAL;
642 goto out;
643 }
644 }
645
646 /* relate the address to the prefix */
647 if (ia->ia6_ndpr == NULL) {
648 ia->ia6_ndpr = pr;
649 pr->ndpr_refcnt++;
650
651 /*
652 * If this is the first autoconf address from the
653 * prefix, create a temporary address as well
654 * (when required).
655 */
656 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
657 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
658 int e;
659 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
660 log(LOG_NOTICE, "in6_control: failed "
661 "to create a temporary address, "
662 "errno=%d\n", e);
663 }
664 }
665 }
666
667 /*
668 * this might affect the status of autoconfigured addresses,
669 * that is, this address might make other addresses detached.
670 */
671 pfxlist_onlink_check();
672 if (error == 0 && ia)
673 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
674 break;
675 }
676
677 case SIOCDIFADDR_IN6:
678 {
679 struct nd_prefix *pr;
680
681 /*
682 * If the address being deleted is the only one that owns
683 * the corresponding prefix, expire the prefix as well.
684 * XXX: theoretically, we don't have to worry about such
685 * relationship, since we separate the address management
686 * and the prefix management. We do this, however, to provide
687 * as much backward compatibility as possible in terms of
688 * the ioctl operation.
689 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
690 */
691 pr = ia->ia6_ndpr;
692 in6_purgeaddr(&ia->ia_ifa);
693 if (pr && pr->ndpr_refcnt == 0)
694 prelist_remove(pr);
695 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
696 break;
697 }
698
699 default:
700 if (ifp == NULL || ifp->if_ioctl == 0) {
701 error = EOPNOTSUPP;
702 goto out;
703 }
704 error = (*ifp->if_ioctl)(ifp, cmd, data);
705 goto out;
706 }
707
708 error = 0;
709 out:
710 if (ia != NULL)
711 ifa_free(&ia->ia_ifa);
712 return (error);
713 }
714
715 /*
716 * Join necessary multicast groups. Factored out from in6_update_ifa().
717 * This entire work should only be done once, for the default FIB.
718 */
719 static int
720 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
721 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
722 {
723 char ip6buf[INET6_ADDRSTRLEN];
724 struct sockaddr_in6 mltaddr, mltmask;
725 struct in6_addr llsol;
726 struct in6_multi_mship *imm;
727 struct rtentry *rt;
728 int delay, error;
729
730 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
731
732 /* Join solicited multicast addr for new host id. */
733 bzero(&llsol, sizeof(struct in6_addr));
734 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
735 llsol.s6_addr32[1] = 0;
736 llsol.s6_addr32[2] = htonl(1);
737 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
738 llsol.s6_addr8[12] = 0xff;
739 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
740 /* XXX: should not happen */
741 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
742 goto cleanup;
743 }
744 delay = 0;
745 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
746 /*
747 * We need a random delay for DAD on the address being
748 * configured. It also means delaying transmission of the
749 * corresponding MLD report to avoid report collision.
750 * [RFC 4861, Section 6.3.7]
751 */
752 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
753 }
754 imm = in6_joingroup(ifp, &llsol, &error, delay);
755 if (imm == NULL) {
756 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
757 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
758 if_name(ifp), error));
759 goto cleanup;
760 }
761 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
762 *in6m_sol = imm->i6mm_maddr;
763
764 bzero(&mltmask, sizeof(mltmask));
765 mltmask.sin6_len = sizeof(struct sockaddr_in6);
766 mltmask.sin6_family = AF_INET6;
767 mltmask.sin6_addr = in6mask32;
768 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
769
770 /*
771 * Join link-local all-nodes address.
772 */
773 bzero(&mltaddr, sizeof(mltaddr));
774 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
775 mltaddr.sin6_family = AF_INET6;
776 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
777 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
778 goto cleanup; /* XXX: should not fail */
779
780 /*
781 * XXX: do we really need this automatic routes? We should probably
782 * reconsider this stuff. Most applications actually do not need the
783 * routes, since they usually specify the outgoing interface.
784 */
785 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
786 if (rt != NULL) {
787 /* XXX: only works in !SCOPEDROUTING case. */
788 if (memcmp(&mltaddr.sin6_addr,
789 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
790 MLTMASK_LEN)) {
791 RTFREE_LOCKED(rt);
792 rt = NULL;
793 }
794 }
795 if (rt == NULL) {
796 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
797 (struct sockaddr *)&ia->ia_addr,
798 (struct sockaddr *)&mltmask, RTF_UP,
799 (struct rtentry **)0, RT_DEFAULT_FIB);
800 if (error)
801 goto cleanup;
802 } else
803 RTFREE_LOCKED(rt);
804
805 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
806 if (imm == NULL) {
807 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
808 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
809 &mltaddr.sin6_addr), if_name(ifp), error));
810 goto cleanup;
811 }
812 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
813
814 /*
815 * Join node information group address.
816 */
817 delay = 0;
818 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
819 /*
820 * The spec does not say anything about delay for this group,
821 * but the same logic should apply.
822 */
823 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
824 }
825 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
826 /* XXX jinmei */
827 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
828 if (imm == NULL)
829 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
830 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
831 &mltaddr.sin6_addr), if_name(ifp), error));
832 /* XXX not very fatal, go on... */
833 else
834 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
835 }
836
837 /*
838 * Join interface-local all-nodes address.
839 * (ff01::1%ifN, and ff01::%ifN/32)
840 */
841 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
842 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
843 goto cleanup; /* XXX: should not fail */
844 /* XXX: again, do we really need the route? */
845 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
846 if (rt != NULL) {
847 if (memcmp(&mltaddr.sin6_addr,
848 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
849 MLTMASK_LEN)) {
850 RTFREE_LOCKED(rt);
851 rt = NULL;
852 }
853 }
854 if (rt == NULL) {
855 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
856 (struct sockaddr *)&ia->ia_addr,
857 (struct sockaddr *)&mltmask, RTF_UP,
858 (struct rtentry **)0, RT_DEFAULT_FIB);
859 if (error)
860 goto cleanup;
861 } else
862 RTFREE_LOCKED(rt);
863
864 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
865 if (imm == NULL) {
866 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
867 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
868 &mltaddr.sin6_addr), if_name(ifp), error));
869 goto cleanup;
870 }
871 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
872 #undef MLTMASK_LEN
873
874 cleanup:
875 return (error);
876 }
877
878 /*
879 * Update parameters of an IPv6 interface address.
880 * If necessary, a new entry is created and linked into address chains.
881 * This function is separated from in6_control().
882 * XXX: should this be performed under splnet()?
883 */
884 int
885 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
886 struct in6_ifaddr *ia, int flags)
887 {
888 int error = 0, hostIsNew = 0, plen = -1;
889 struct sockaddr_in6 dst6;
890 struct in6_addrlifetime *lt;
891 struct in6_multi *in6m_sol;
892 int delay;
893 char ip6buf[INET6_ADDRSTRLEN];
894
895 /* Validate parameters */
896 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
897 return (EINVAL);
898
899 /*
900 * The destination address for a p2p link must have a family
901 * of AF_UNSPEC or AF_INET6.
902 */
903 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
904 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
905 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
906 return (EAFNOSUPPORT);
907 /*
908 * validate ifra_prefixmask. don't check sin6_family, netmask
909 * does not carry fields other than sin6_len.
910 */
911 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
912 return (EINVAL);
913 /*
914 * Because the IPv6 address architecture is classless, we require
915 * users to specify a (non 0) prefix length (mask) for a new address.
916 * We also require the prefix (when specified) mask is valid, and thus
917 * reject a non-consecutive mask.
918 */
919 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
920 return (EINVAL);
921 if (ifra->ifra_prefixmask.sin6_len != 0) {
922 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
923 (u_char *)&ifra->ifra_prefixmask +
924 ifra->ifra_prefixmask.sin6_len);
925 if (plen <= 0)
926 return (EINVAL);
927 } else {
928 /*
929 * In this case, ia must not be NULL. We just use its prefix
930 * length.
931 */
932 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
933 }
934 /*
935 * If the destination address on a p2p interface is specified,
936 * and the address is a scoped one, validate/set the scope
937 * zone identifier.
938 */
939 dst6 = ifra->ifra_dstaddr;
940 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
941 (dst6.sin6_family == AF_INET6)) {
942 struct in6_addr in6_tmp;
943 u_int32_t zoneid;
944
945 in6_tmp = dst6.sin6_addr;
946 if (in6_setscope(&in6_tmp, ifp, &zoneid))
947 return (EINVAL); /* XXX: should be impossible */
948
949 if (dst6.sin6_scope_id != 0) {
950 if (dst6.sin6_scope_id != zoneid)
951 return (EINVAL);
952 } else /* user omit to specify the ID. */
953 dst6.sin6_scope_id = zoneid;
954
955 /* convert into the internal form */
956 if (sa6_embedscope(&dst6, 0))
957 return (EINVAL); /* XXX: should be impossible */
958 }
959 /*
960 * The destination address can be specified only for a p2p or a
961 * loopback interface. If specified, the corresponding prefix length
962 * must be 128.
963 */
964 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
965 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
966 /* XXX: noisy message */
967 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
968 "be specified for a p2p or a loopback IF only\n"));
969 return (EINVAL);
970 }
971 if (plen != 128) {
972 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
973 "be 128 when dstaddr is specified\n"));
974 return (EINVAL);
975 }
976 }
977 /* lifetime consistency check */
978 lt = &ifra->ifra_lifetime;
979 if (lt->ia6t_pltime > lt->ia6t_vltime)
980 return (EINVAL);
981 if (lt->ia6t_vltime == 0) {
982 /*
983 * the following log might be noisy, but this is a typical
984 * configuration mistake or a tool's bug.
985 */
986 nd6log((LOG_INFO,
987 "in6_update_ifa: valid lifetime is 0 for %s\n",
988 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
989
990 if (ia == NULL)
991 return (0); /* there's nothing to do */
992 }
993
994 /*
995 * If this is a new address, allocate a new ifaddr and link it
996 * into chains.
997 */
998 if (ia == NULL) {
999 hostIsNew = 1;
1000 /*
1001 * When in6_update_ifa() is called in a process of a received
1002 * RA, it is called under an interrupt context. So, we should
1003 * call malloc with M_NOWAIT.
1004 */
1005 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1006 M_NOWAIT);
1007 if (ia == NULL)
1008 return (ENOBUFS);
1009 bzero((caddr_t)ia, sizeof(*ia));
1010 ifa_init(&ia->ia_ifa);
1011 LIST_INIT(&ia->ia6_memberships);
1012 /* Initialize the address and masks, and put time stamp */
1013 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1014 ia->ia_addr.sin6_family = AF_INET6;
1015 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1016 ia->ia6_createtime = time_second;
1017 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1018 /*
1019 * XXX: some functions expect that ifa_dstaddr is not
1020 * NULL for p2p interfaces.
1021 */
1022 ia->ia_ifa.ifa_dstaddr =
1023 (struct sockaddr *)&ia->ia_dstaddr;
1024 } else {
1025 ia->ia_ifa.ifa_dstaddr = NULL;
1026 }
1027 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1028 ia->ia_ifp = ifp;
1029 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1030 IF_ADDR_WLOCK(ifp);
1031 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1032 IF_ADDR_WUNLOCK(ifp);
1033
1034 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1035 IN6_IFADDR_WLOCK();
1036 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1037 IN6_IFADDR_WUNLOCK();
1038 }
1039
1040 /* update timestamp */
1041 ia->ia6_updatetime = time_second;
1042
1043 /* set prefix mask */
1044 if (ifra->ifra_prefixmask.sin6_len) {
1045 /*
1046 * We prohibit changing the prefix length of an existing
1047 * address, because
1048 * + such an operation should be rare in IPv6, and
1049 * + the operation would confuse prefix management.
1050 */
1051 if (ia->ia_prefixmask.sin6_len &&
1052 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1053 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1054 " existing (%s) address should not be changed\n",
1055 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1056 error = EINVAL;
1057 goto unlink;
1058 }
1059 ia->ia_prefixmask = ifra->ifra_prefixmask;
1060 }
1061
1062 /*
1063 * If a new destination address is specified, scrub the old one and
1064 * install the new destination. Note that the interface must be
1065 * p2p or loopback (see the check above.)
1066 */
1067 if (dst6.sin6_family == AF_INET6 &&
1068 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1069 int e;
1070
1071 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1072 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1073 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1074 "a route to the old destination: %s\n",
1075 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1076 /* proceed anyway... */
1077 } else
1078 ia->ia_flags &= ~IFA_ROUTE;
1079 ia->ia_dstaddr = dst6;
1080 }
1081
1082 /*
1083 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1084 * to see if the address is deprecated or invalidated, but initialize
1085 * these members for applications.
1086 */
1087 ia->ia6_lifetime = ifra->ifra_lifetime;
1088 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1089 ia->ia6_lifetime.ia6t_expire =
1090 time_second + ia->ia6_lifetime.ia6t_vltime;
1091 } else
1092 ia->ia6_lifetime.ia6t_expire = 0;
1093 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1094 ia->ia6_lifetime.ia6t_preferred =
1095 time_second + ia->ia6_lifetime.ia6t_pltime;
1096 } else
1097 ia->ia6_lifetime.ia6t_preferred = 0;
1098
1099 /* reset the interface and routing table appropriately. */
1100 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1101 goto unlink;
1102
1103 /*
1104 * configure address flags.
1105 */
1106 ia->ia6_flags = ifra->ifra_flags;
1107 /*
1108 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1109 * userland, make it deprecated.
1110 */
1111 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1112 ia->ia6_lifetime.ia6t_pltime = 0;
1113 ia->ia6_lifetime.ia6t_preferred = time_second;
1114 }
1115 /*
1116 * Make the address tentative before joining multicast addresses,
1117 * so that corresponding MLD responses would not have a tentative
1118 * source address.
1119 */
1120 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1121 if (hostIsNew && in6if_do_dad(ifp))
1122 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1123
1124 /*
1125 * We are done if we have simply modified an existing address.
1126 */
1127 if (!hostIsNew)
1128 return (error);
1129
1130 /*
1131 * Beyond this point, we should call in6_purgeaddr upon an error,
1132 * not just go to unlink.
1133 */
1134
1135 /* Join necessary multicast groups. */
1136 in6m_sol = NULL;
1137 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1138 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1139 if (error)
1140 goto cleanup;
1141 }
1142
1143 /*
1144 * Perform DAD, if needed.
1145 * XXX It may be of use, if we can administratively disable DAD.
1146 */
1147 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1148 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1149 {
1150 int mindelay, maxdelay;
1151
1152 delay = 0;
1153 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1154 /*
1155 * We need to impose a delay before sending an NS
1156 * for DAD. Check if we also needed a delay for the
1157 * corresponding MLD message. If we did, the delay
1158 * should be larger than the MLD delay (this could be
1159 * relaxed a bit, but this simple logic is at least
1160 * safe).
1161 * XXX: Break data hiding guidelines and look at
1162 * state for the solicited multicast group.
1163 */
1164 mindelay = 0;
1165 if (in6m_sol != NULL &&
1166 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1167 mindelay = in6m_sol->in6m_timer;
1168 }
1169 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1170 if (maxdelay - mindelay == 0)
1171 delay = 0;
1172 else {
1173 delay =
1174 (arc4random() % (maxdelay - mindelay)) +
1175 mindelay;
1176 }
1177 }
1178 nd6_dad_start((struct ifaddr *)ia, delay);
1179 }
1180
1181 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1182 ifa_free(&ia->ia_ifa);
1183 return (error);
1184
1185 unlink:
1186 /*
1187 * XXX: if a change of an existing address failed, keep the entry
1188 * anyway.
1189 */
1190 if (hostIsNew) {
1191 in6_unlink_ifa(ia, ifp);
1192 ifa_free(&ia->ia_ifa);
1193 }
1194 return (error);
1195
1196 cleanup:
1197 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1198 ifa_free(&ia->ia_ifa);
1199 in6_purgeaddr(&ia->ia_ifa);
1200 return error;
1201 }
1202
1203 /*
1204 * Leave multicast groups. Factored out from in6_purgeaddr().
1205 * This entire work should only be done once, for the default FIB.
1206 */
1207 static int
1208 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1209 {
1210 struct sockaddr_in6 mltaddr, mltmask;
1211 struct in6_multi_mship *imm;
1212 struct rtentry *rt;
1213 struct sockaddr_in6 sin6;
1214 int error;
1215
1216 /*
1217 * Leave from multicast groups we have joined for the interface.
1218 */
1219 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1220 LIST_REMOVE(imm, i6mm_chain);
1221 in6_leavegroup(imm);
1222 }
1223
1224 /*
1225 * Remove the link-local all-nodes address.
1226 */
1227 bzero(&mltmask, sizeof(mltmask));
1228 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1229 mltmask.sin6_family = AF_INET6;
1230 mltmask.sin6_addr = in6mask32;
1231
1232 bzero(&mltaddr, sizeof(mltaddr));
1233 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1234 mltaddr.sin6_family = AF_INET6;
1235 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1236
1237 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1238 return (error);
1239
1240 /*
1241 * As for the mltaddr above, proactively prepare the sin6 to avoid
1242 * rtentry un- and re-locking.
1243 */
1244 if (ifa0 != NULL) {
1245 bzero(&sin6, sizeof(sin6));
1246 sin6.sin6_len = sizeof(sin6);
1247 sin6.sin6_family = AF_INET6;
1248 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1249 sizeof(sin6.sin6_addr));
1250 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1251 if (error != 0)
1252 return (error);
1253 }
1254
1255 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1256 if (rt != NULL && rt->rt_gateway != NULL &&
1257 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1258 &ia->ia_addr.sin6_addr,
1259 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1260 /*
1261 * If no more IPv6 address exists on this interface then
1262 * remove the multicast address route.
1263 */
1264 if (ifa0 == NULL) {
1265 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr,
1266 sizeof(mltaddr.sin6_addr));
1267 RTFREE_LOCKED(rt);
1268 error = in6_rtrequest(RTM_DELETE,
1269 (struct sockaddr *)&mltaddr,
1270 (struct sockaddr *)&ia->ia_addr,
1271 (struct sockaddr *)&mltmask, RTF_UP,
1272 (struct rtentry **)0, RT_DEFAULT_FIB);
1273 if (error)
1274 log(LOG_INFO, "%s: link-local all-nodes "
1275 "multicast address deletion error\n",
1276 __func__);
1277 } else {
1278 /*
1279 * Replace the gateway of the route.
1280 */
1281 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1282 RTFREE_LOCKED(rt);
1283 }
1284 } else {
1285 if (rt != NULL)
1286 RTFREE_LOCKED(rt);
1287 }
1288
1289 /*
1290 * Remove the node-local all-nodes address.
1291 */
1292 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1293 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1294 return (error);
1295
1296 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1297 if (rt != NULL && rt->rt_gateway != NULL &&
1298 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1299 &ia->ia_addr.sin6_addr,
1300 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1301 /*
1302 * If no more IPv6 address exists on this interface then
1303 * remove the multicast address route.
1304 */
1305 if (ifa0 == NULL) {
1306 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr,
1307 sizeof(mltaddr.sin6_addr));
1308
1309 RTFREE_LOCKED(rt);
1310 error = in6_rtrequest(RTM_DELETE,
1311 (struct sockaddr *)&mltaddr,
1312 (struct sockaddr *)&ia->ia_addr,
1313 (struct sockaddr *)&mltmask, RTF_UP,
1314 (struct rtentry **)0, RT_DEFAULT_FIB);
1315 if (error)
1316 log(LOG_INFO, "%s: node-local all-nodes"
1317 "multicast address deletion error\n",
1318 __func__);
1319 } else {
1320 /*
1321 * Replace the gateway of the route.
1322 */
1323 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1324 RTFREE_LOCKED(rt);
1325 }
1326 } else {
1327 if (rt != NULL)
1328 RTFREE_LOCKED(rt);
1329 }
1330
1331 return (0);
1332 }
1333
1334 void
1335 in6_purgeaddr(struct ifaddr *ifa)
1336 {
1337 struct ifnet *ifp = ifa->ifa_ifp;
1338 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1339 struct sockaddr_dl gateway;
1340 struct sockaddr_in6 mask, addr;
1341 struct rtentry rt0;
1342 int plen, error;
1343 struct ifaddr *ifa0;
1344
1345 /*
1346 * find another IPv6 address as the gateway for the
1347 * link-local and node-local all-nodes multicast
1348 * address routes
1349 */
1350 IF_ADDR_RLOCK(ifp);
1351 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1352 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1353 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1354 &ia->ia_addr.sin6_addr,
1355 sizeof(struct in6_addr)) == 0)
1356 continue;
1357 else
1358 break;
1359 }
1360 if (ifa0 != NULL)
1361 ifa_ref(ifa0);
1362 IF_ADDR_RUNLOCK(ifp);
1363
1364 /*
1365 * Remove the loopback route to the interface address.
1366 * The check for the current setting of "nd6_useloopback"
1367 * is not needed.
1368 */
1369 if (ia->ia_flags & IFA_RTSELF) {
1370 error = ifa_del_loopback_route((struct ifaddr *)ia,
1371 (struct sockaddr *)&ia->ia_addr);
1372 if (error == 0)
1373 ia->ia_flags &= ~IFA_RTSELF;
1374 }
1375
1376 /* stop DAD processing */
1377 nd6_dad_stop(ifa);
1378
1379 /* Remove local address entry from lltable. */
1380 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
1381 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
1382 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
1383 (struct sockaddr *)&mask, LLE_STATIC);
1384
1385 /*
1386 * initialize for rtmsg generation
1387 */
1388 bzero(&gateway, sizeof(gateway));
1389 gateway.sdl_len = sizeof(gateway);
1390 gateway.sdl_family = AF_LINK;
1391 gateway.sdl_nlen = 0;
1392 gateway.sdl_alen = ifp->if_addrlen;
1393 /* */
1394 bzero(&rt0, sizeof(rt0));
1395 rt0.rt_gateway = (struct sockaddr *)&gateway;
1396 rt_mask(&rt0) = (struct sockaddr *)&mask;
1397 rt_key(&rt0) = (struct sockaddr *)&addr;
1398 rt0.rt_flags = RTF_HOST | RTF_STATIC;
1399 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
1400
1401 /* Leave multicast groups. */
1402 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1403
1404 if (ifa0 != NULL)
1405 ifa_free(ifa0);
1406
1407 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1408 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1409 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1410 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1411 if (error != 0)
1412 log(LOG_INFO, "%s: err=%d, destination address delete "
1413 "failed\n", __func__, error);
1414 ia->ia_flags &= ~IFA_ROUTE;
1415 }
1416
1417 in6_unlink_ifa(ia, ifp);
1418 }
1419
1420 static void
1421 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1422 {
1423 int s = splnet();
1424
1425 IF_ADDR_WLOCK(ifp);
1426 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1427 IF_ADDR_WUNLOCK(ifp);
1428 ifa_free(&ia->ia_ifa); /* if_addrhead */
1429
1430 /*
1431 * Defer the release of what might be the last reference to the
1432 * in6_ifaddr so that it can't be freed before the remainder of the
1433 * cleanup.
1434 */
1435 IN6_IFADDR_WLOCK();
1436 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1437 IN6_IFADDR_WUNLOCK();
1438
1439 /*
1440 * Release the reference to the base prefix. There should be a
1441 * positive reference.
1442 */
1443 if (ia->ia6_ndpr == NULL) {
1444 nd6log((LOG_NOTICE,
1445 "in6_unlink_ifa: autoconf'ed address "
1446 "%p has no prefix\n", ia));
1447 } else {
1448 ia->ia6_ndpr->ndpr_refcnt--;
1449 ia->ia6_ndpr = NULL;
1450 }
1451
1452 /*
1453 * Also, if the address being removed is autoconf'ed, call
1454 * pfxlist_onlink_check() since the release might affect the status of
1455 * other (detached) addresses.
1456 */
1457 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1458 pfxlist_onlink_check();
1459 }
1460 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1461 splx(s);
1462 }
1463
1464 void
1465 in6_purgeif(struct ifnet *ifp)
1466 {
1467 struct ifaddr *ifa, *nifa;
1468
1469 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1470 if (ifa->ifa_addr->sa_family != AF_INET6)
1471 continue;
1472 in6_purgeaddr(ifa);
1473 }
1474
1475 in6_ifdetach(ifp);
1476 }
1477
1478 /*
1479 * SIOC[GAD]LIFADDR.
1480 * SIOCGLIFADDR: get first address. (?)
1481 * SIOCGLIFADDR with IFLR_PREFIX:
1482 * get first address that matches the specified prefix.
1483 * SIOCALIFADDR: add the specified address.
1484 * SIOCALIFADDR with IFLR_PREFIX:
1485 * add the specified prefix, filling hostid part from
1486 * the first link-local address. prefixlen must be <= 64.
1487 * SIOCDLIFADDR: delete the specified address.
1488 * SIOCDLIFADDR with IFLR_PREFIX:
1489 * delete the first address that matches the specified prefix.
1490 * return values:
1491 * EINVAL on invalid parameters
1492 * EADDRNOTAVAIL on prefix match failed/specified address not found
1493 * other values may be returned from in6_ioctl()
1494 *
1495 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1496 * this is to accomodate address naming scheme other than RFC2374,
1497 * in the future.
1498 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1499 * address encoding scheme. (see figure on page 8)
1500 */
1501 static int
1502 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1503 struct ifnet *ifp, struct thread *td)
1504 {
1505 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1506 struct ifaddr *ifa;
1507 struct sockaddr *sa;
1508
1509 /* sanity checks */
1510 if (!data || !ifp) {
1511 panic("invalid argument to in6_lifaddr_ioctl");
1512 /* NOTREACHED */
1513 }
1514
1515 switch (cmd) {
1516 case SIOCGLIFADDR:
1517 /* address must be specified on GET with IFLR_PREFIX */
1518 if ((iflr->flags & IFLR_PREFIX) == 0)
1519 break;
1520 /* FALLTHROUGH */
1521 case SIOCALIFADDR:
1522 case SIOCDLIFADDR:
1523 /* address must be specified on ADD and DELETE */
1524 sa = (struct sockaddr *)&iflr->addr;
1525 if (sa->sa_family != AF_INET6)
1526 return EINVAL;
1527 if (sa->sa_len != sizeof(struct sockaddr_in6))
1528 return EINVAL;
1529 /* XXX need improvement */
1530 sa = (struct sockaddr *)&iflr->dstaddr;
1531 if (sa->sa_family && sa->sa_family != AF_INET6)
1532 return EINVAL;
1533 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1534 return EINVAL;
1535 break;
1536 default: /* shouldn't happen */
1537 #if 0
1538 panic("invalid cmd to in6_lifaddr_ioctl");
1539 /* NOTREACHED */
1540 #else
1541 return EOPNOTSUPP;
1542 #endif
1543 }
1544 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1545 return EINVAL;
1546
1547 switch (cmd) {
1548 case SIOCALIFADDR:
1549 {
1550 struct in6_aliasreq ifra;
1551 struct in6_addr *hostid = NULL;
1552 int prefixlen;
1553
1554 ifa = NULL;
1555 if ((iflr->flags & IFLR_PREFIX) != 0) {
1556 struct sockaddr_in6 *sin6;
1557
1558 /*
1559 * hostid is to fill in the hostid part of the
1560 * address. hostid points to the first link-local
1561 * address attached to the interface.
1562 */
1563 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1564 if (!ifa)
1565 return EADDRNOTAVAIL;
1566 hostid = IFA_IN6(ifa);
1567
1568 /* prefixlen must be <= 64. */
1569 if (64 < iflr->prefixlen) {
1570 if (ifa != NULL)
1571 ifa_free(ifa);
1572 return EINVAL;
1573 }
1574 prefixlen = iflr->prefixlen;
1575
1576 /* hostid part must be zero. */
1577 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1578 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1579 sin6->sin6_addr.s6_addr32[3] != 0) {
1580 if (ifa != NULL)
1581 ifa_free(ifa);
1582 return EINVAL;
1583 }
1584 } else
1585 prefixlen = iflr->prefixlen;
1586
1587 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1588 bzero(&ifra, sizeof(ifra));
1589 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1590
1591 bcopy(&iflr->addr, &ifra.ifra_addr,
1592 ((struct sockaddr *)&iflr->addr)->sa_len);
1593 if (hostid) {
1594 /* fill in hostid part */
1595 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1596 hostid->s6_addr32[2];
1597 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1598 hostid->s6_addr32[3];
1599 }
1600
1601 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1602 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1603 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1604 if (hostid) {
1605 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1606 hostid->s6_addr32[2];
1607 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1608 hostid->s6_addr32[3];
1609 }
1610 }
1611 if (ifa != NULL)
1612 ifa_free(ifa);
1613
1614 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1615 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1616
1617 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1618 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1619 }
1620 case SIOCGLIFADDR:
1621 case SIOCDLIFADDR:
1622 {
1623 struct in6_ifaddr *ia;
1624 struct in6_addr mask, candidate, match;
1625 struct sockaddr_in6 *sin6;
1626 int cmp;
1627
1628 bzero(&mask, sizeof(mask));
1629 if (iflr->flags & IFLR_PREFIX) {
1630 /* lookup a prefix rather than address. */
1631 in6_prefixlen2mask(&mask, iflr->prefixlen);
1632
1633 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1634 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1635 match.s6_addr32[0] &= mask.s6_addr32[0];
1636 match.s6_addr32[1] &= mask.s6_addr32[1];
1637 match.s6_addr32[2] &= mask.s6_addr32[2];
1638 match.s6_addr32[3] &= mask.s6_addr32[3];
1639
1640 /* if you set extra bits, that's wrong */
1641 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1642 return EINVAL;
1643
1644 cmp = 1;
1645 } else {
1646 if (cmd == SIOCGLIFADDR) {
1647 /* on getting an address, take the 1st match */
1648 cmp = 0; /* XXX */
1649 } else {
1650 /* on deleting an address, do exact match */
1651 in6_prefixlen2mask(&mask, 128);
1652 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1653 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1654
1655 cmp = 1;
1656 }
1657 }
1658
1659 IF_ADDR_RLOCK(ifp);
1660 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1661 if (ifa->ifa_addr->sa_family != AF_INET6)
1662 continue;
1663 if (!cmp)
1664 break;
1665
1666 /*
1667 * XXX: this is adhoc, but is necessary to allow
1668 * a user to specify fe80::/64 (not /10) for a
1669 * link-local address.
1670 */
1671 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1672 in6_clearscope(&candidate);
1673 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1674 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1675 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1676 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1677 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1678 break;
1679 }
1680 if (ifa != NULL)
1681 ifa_ref(ifa);
1682 IF_ADDR_RUNLOCK(ifp);
1683 if (!ifa)
1684 return EADDRNOTAVAIL;
1685 ia = ifa2ia6(ifa);
1686
1687 if (cmd == SIOCGLIFADDR) {
1688 int error;
1689
1690 /* fill in the if_laddrreq structure */
1691 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1692 error = sa6_recoverscope(
1693 (struct sockaddr_in6 *)&iflr->addr);
1694 if (error != 0) {
1695 ifa_free(ifa);
1696 return (error);
1697 }
1698
1699 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1700 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1701 ia->ia_dstaddr.sin6_len);
1702 error = sa6_recoverscope(
1703 (struct sockaddr_in6 *)&iflr->dstaddr);
1704 if (error != 0) {
1705 ifa_free(ifa);
1706 return (error);
1707 }
1708 } else
1709 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1710
1711 iflr->prefixlen =
1712 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1713
1714 iflr->flags = ia->ia6_flags; /* XXX */
1715 ifa_free(ifa);
1716
1717 return 0;
1718 } else {
1719 struct in6_aliasreq ifra;
1720
1721 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1722 bzero(&ifra, sizeof(ifra));
1723 bcopy(iflr->iflr_name, ifra.ifra_name,
1724 sizeof(ifra.ifra_name));
1725
1726 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1727 ia->ia_addr.sin6_len);
1728 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1729 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1730 ia->ia_dstaddr.sin6_len);
1731 } else {
1732 bzero(&ifra.ifra_dstaddr,
1733 sizeof(ifra.ifra_dstaddr));
1734 }
1735 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1736 ia->ia_prefixmask.sin6_len);
1737
1738 ifra.ifra_flags = ia->ia6_flags;
1739 ifa_free(ifa);
1740 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1741 ifp, td);
1742 }
1743 }
1744 }
1745
1746 return EOPNOTSUPP; /* just for safety */
1747 }
1748
1749 /*
1750 * Initialize an interface's IPv6 address and routing table entry.
1751 */
1752 static int
1753 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1754 struct sockaddr_in6 *sin6, int newhost)
1755 {
1756 int error = 0, plen, ifacount = 0;
1757 int s = splimp();
1758 struct ifaddr *ifa;
1759
1760 /*
1761 * Give the interface a chance to initialize
1762 * if this is its first address,
1763 * and to validate the address if necessary.
1764 */
1765 IF_ADDR_RLOCK(ifp);
1766 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1767 if (ifa->ifa_addr->sa_family != AF_INET6)
1768 continue;
1769 ifacount++;
1770 }
1771 IF_ADDR_RUNLOCK(ifp);
1772
1773 ia->ia_addr = *sin6;
1774
1775 if (ifacount <= 1 && ifp->if_ioctl) {
1776 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1777 if (error) {
1778 splx(s);
1779 return (error);
1780 }
1781 }
1782 splx(s);
1783
1784 ia->ia_ifa.ifa_metric = ifp->if_metric;
1785
1786 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1787
1788 /*
1789 * Special case:
1790 * If a new destination address is specified for a point-to-point
1791 * interface, install a route to the destination as an interface
1792 * direct route.
1793 * XXX: the logic below rejects assigning multiple addresses on a p2p
1794 * interface that share the same destination.
1795 */
1796 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1797 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1798 ia->ia_dstaddr.sin6_family == AF_INET6) {
1799 int rtflags = RTF_UP | RTF_HOST;
1800 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1801 if (error)
1802 return (error);
1803 ia->ia_flags |= IFA_ROUTE;
1804 /*
1805 * Handle the case for ::1 .
1806 */
1807 if (ifp->if_flags & IFF_LOOPBACK)
1808 ia->ia_flags |= IFA_RTSELF;
1809 }
1810
1811 /*
1812 * add a loopback route to self
1813 */
1814 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1815 error = ifa_add_loopback_route((struct ifaddr *)ia,
1816 (struct sockaddr *)&ia->ia_addr);
1817 if (error == 0)
1818 ia->ia_flags |= IFA_RTSELF;
1819 }
1820
1821 /* Add local address to lltable, if necessary (ex. on p2p link). */
1822 if (newhost) {
1823 struct llentry *ln;
1824 struct rtentry rt;
1825 struct sockaddr_dl gateway;
1826 struct sockaddr_in6 mask, addr;
1827
1828 IF_AFDATA_LOCK(ifp);
1829 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1830 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE),
1831 (struct sockaddr *)&ia->ia_addr);
1832 IF_AFDATA_UNLOCK(ifp);
1833 if (ln != NULL) {
1834 ln->la_expire = 0; /* for IPv6 this means permanent */
1835 ln->ln_state = ND6_LLINFO_REACHABLE;
1836 /*
1837 * initialize for rtmsg generation
1838 */
1839 bzero(&gateway, sizeof(gateway));
1840 gateway.sdl_len = sizeof(gateway);
1841 gateway.sdl_family = AF_LINK;
1842 gateway.sdl_nlen = 0;
1843 gateway.sdl_alen = 6;
1844 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr));
1845 /* */
1846 LLE_WUNLOCK(ln);
1847 }
1848
1849 bzero(&rt, sizeof(rt));
1850 rt.rt_gateway = (struct sockaddr *)&gateway;
1851 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
1852 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
1853 rt_mask(&rt) = (struct sockaddr *)&mask;
1854 rt_key(&rt) = (struct sockaddr *)&addr;
1855 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
1856 /* Announce arrival of local address to all FIBs. */
1857 rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt);
1858 }
1859
1860 return (error);
1861 }
1862
1863 /*
1864 * Find an IPv6 interface link-local address specific to an interface.
1865 * ifaddr is returned referenced.
1866 */
1867 struct in6_ifaddr *
1868 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1869 {
1870 struct ifaddr *ifa;
1871
1872 IF_ADDR_RLOCK(ifp);
1873 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1874 if (ifa->ifa_addr->sa_family != AF_INET6)
1875 continue;
1876 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1877 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1878 ignoreflags) != 0)
1879 continue;
1880 ifa_ref(ifa);
1881 break;
1882 }
1883 }
1884 IF_ADDR_RUNLOCK(ifp);
1885
1886 return ((struct in6_ifaddr *)ifa);
1887 }
1888
1889
1890 /*
1891 * find the internet address corresponding to a given interface and address.
1892 * ifaddr is returned referenced.
1893 */
1894 struct in6_ifaddr *
1895 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1896 {
1897 struct ifaddr *ifa;
1898
1899 IF_ADDR_RLOCK(ifp);
1900 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1901 if (ifa->ifa_addr->sa_family != AF_INET6)
1902 continue;
1903 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1904 ifa_ref(ifa);
1905 break;
1906 }
1907 }
1908 IF_ADDR_RUNLOCK(ifp);
1909
1910 return ((struct in6_ifaddr *)ifa);
1911 }
1912
1913 /*
1914 * Convert IP6 address to printable (loggable) representation. Caller
1915 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1916 */
1917 static char digits[] = "0123456789abcdef";
1918 char *
1919 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1920 {
1921 int i;
1922 char *cp;
1923 const u_int16_t *a = (const u_int16_t *)addr;
1924 const u_int8_t *d;
1925 int dcolon = 0, zero = 0;
1926
1927 cp = ip6buf;
1928
1929 for (i = 0; i < 8; i++) {
1930 if (dcolon == 1) {
1931 if (*a == 0) {
1932 if (i == 7)
1933 *cp++ = ':';
1934 a++;
1935 continue;
1936 } else
1937 dcolon = 2;
1938 }
1939 if (*a == 0) {
1940 if (dcolon == 0 && *(a + 1) == 0) {
1941 if (i == 0)
1942 *cp++ = ':';
1943 *cp++ = ':';
1944 dcolon = 1;
1945 } else {
1946 *cp++ = '';
1947 *cp++ = ':';
1948 }
1949 a++;
1950 continue;
1951 }
1952 d = (const u_char *)a;
1953 /* Try to eliminate leading zeros in printout like in :0001. */
1954 zero = 1;
1955 *cp = digits[*d >> 4];
1956 if (*cp != '') {
1957 zero = 0;
1958 cp++;
1959 }
1960 *cp = digits[*d++ & 0xf];
1961 if (zero == 0 || (*cp != '')) {
1962 zero = 0;
1963 cp++;
1964 }
1965 *cp = digits[*d >> 4];
1966 if (zero == 0 || (*cp != '')) {
1967 zero = 0;
1968 cp++;
1969 }
1970 *cp++ = digits[*d & 0xf];
1971 *cp++ = ':';
1972 a++;
1973 }
1974 *--cp = '\0';
1975 return (ip6buf);
1976 }
1977
1978 int
1979 in6_localaddr(struct in6_addr *in6)
1980 {
1981 struct in6_ifaddr *ia;
1982
1983 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1984 return 1;
1985
1986 IN6_IFADDR_RLOCK();
1987 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1988 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1989 &ia->ia_prefixmask.sin6_addr)) {
1990 IN6_IFADDR_RUNLOCK();
1991 return 1;
1992 }
1993 }
1994 IN6_IFADDR_RUNLOCK();
1995
1996 return (0);
1997 }
1998
1999 int
2000 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2001 {
2002 struct in6_ifaddr *ia;
2003
2004 IN6_IFADDR_RLOCK();
2005 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2006 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2007 &sa6->sin6_addr) &&
2008 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2009 IN6_IFADDR_RUNLOCK();
2010 return (1); /* true */
2011 }
2012
2013 /* XXX: do we still have to go thru the rest of the list? */
2014 }
2015 IN6_IFADDR_RUNLOCK();
2016
2017 return (0); /* false */
2018 }
2019
2020 /*
2021 * return length of part which dst and src are equal
2022 * hard coding...
2023 */
2024 int
2025 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2026 {
2027 int match = 0;
2028 u_char *s = (u_char *)src, *d = (u_char *)dst;
2029 u_char *lim = s + 16, r;
2030
2031 while (s < lim)
2032 if ((r = (*d++ ^ *s++)) != 0) {
2033 while (r < 128) {
2034 match++;
2035 r <<= 1;
2036 }
2037 break;
2038 } else
2039 match += 8;
2040 return match;
2041 }
2042
2043 /* XXX: to be scope conscious */
2044 int
2045 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2046 {
2047 int bytelen, bitlen;
2048
2049 /* sanity check */
2050 if (0 > len || len > 128) {
2051 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2052 len);
2053 return (0);
2054 }
2055
2056 bytelen = len / 8;
2057 bitlen = len % 8;
2058
2059 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2060 return (0);
2061 if (bitlen != 0 &&
2062 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2063 p2->s6_addr[bytelen] >> (8 - bitlen))
2064 return (0);
2065
2066 return (1);
2067 }
2068
2069 void
2070 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2071 {
2072 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2073 int bytelen, bitlen, i;
2074
2075 /* sanity check */
2076 if (0 > len || len > 128) {
2077 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2078 len);
2079 return;
2080 }
2081
2082 bzero(maskp, sizeof(*maskp));
2083 bytelen = len / 8;
2084 bitlen = len % 8;
2085 for (i = 0; i < bytelen; i++)
2086 maskp->s6_addr[i] = 0xff;
2087 if (bitlen)
2088 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2089 }
2090
2091 /*
2092 * return the best address out of the same scope. if no address was
2093 * found, return the first valid address from designated IF.
2094 */
2095 struct in6_ifaddr *
2096 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2097 {
2098 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2099 struct ifaddr *ifa;
2100 struct in6_ifaddr *besta = 0;
2101 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2102
2103 dep[0] = dep[1] = NULL;
2104
2105 /*
2106 * We first look for addresses in the same scope.
2107 * If there is one, return it.
2108 * If two or more, return one which matches the dst longest.
2109 * If none, return one of global addresses assigned other ifs.
2110 */
2111 IF_ADDR_RLOCK(ifp);
2112 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2113 if (ifa->ifa_addr->sa_family != AF_INET6)
2114 continue;
2115 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2116 continue; /* XXX: is there any case to allow anycast? */
2117 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2118 continue; /* don't use this interface */
2119 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2120 continue;
2121 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2122 if (V_ip6_use_deprecated)
2123 dep[0] = (struct in6_ifaddr *)ifa;
2124 continue;
2125 }
2126
2127 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2128 /*
2129 * call in6_matchlen() as few as possible
2130 */
2131 if (besta) {
2132 if (blen == -1)
2133 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2134 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2135 if (tlen > blen) {
2136 blen = tlen;
2137 besta = (struct in6_ifaddr *)ifa;
2138 }
2139 } else
2140 besta = (struct in6_ifaddr *)ifa;
2141 }
2142 }
2143 if (besta) {
2144 ifa_ref(&besta->ia_ifa);
2145 IF_ADDR_RUNLOCK(ifp);
2146 return (besta);
2147 }
2148
2149 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2150 if (ifa->ifa_addr->sa_family != AF_INET6)
2151 continue;
2152 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2153 continue; /* XXX: is there any case to allow anycast? */
2154 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2155 continue; /* don't use this interface */
2156 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2157 continue;
2158 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2159 if (V_ip6_use_deprecated)
2160 dep[1] = (struct in6_ifaddr *)ifa;
2161 continue;
2162 }
2163
2164 if (ifa != NULL)
2165 ifa_ref(ifa);
2166 IF_ADDR_RUNLOCK(ifp);
2167 return (struct in6_ifaddr *)ifa;
2168 }
2169
2170 /* use the last-resort values, that are, deprecated addresses */
2171 if (dep[0]) {
2172 ifa_ref((struct ifaddr *)dep[0]);
2173 IF_ADDR_RUNLOCK(ifp);
2174 return dep[0];
2175 }
2176 if (dep[1]) {
2177 ifa_ref((struct ifaddr *)dep[1]);
2178 IF_ADDR_RUNLOCK(ifp);
2179 return dep[1];
2180 }
2181
2182 IF_ADDR_RUNLOCK(ifp);
2183 return NULL;
2184 }
2185
2186 /*
2187 * perform DAD when interface becomes IFF_UP.
2188 */
2189 void
2190 in6_if_up(struct ifnet *ifp)
2191 {
2192 struct ifaddr *ifa;
2193 struct in6_ifaddr *ia;
2194
2195 IF_ADDR_RLOCK(ifp);
2196 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2197 if (ifa->ifa_addr->sa_family != AF_INET6)
2198 continue;
2199 ia = (struct in6_ifaddr *)ifa;
2200 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2201 /*
2202 * The TENTATIVE flag was likely set by hand
2203 * beforehand, implicitly indicating the need for DAD.
2204 * We may be able to skip the random delay in this
2205 * case, but we impose delays just in case.
2206 */
2207 nd6_dad_start(ifa,
2208 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2209 }
2210 }
2211 IF_ADDR_RUNLOCK(ifp);
2212
2213 /*
2214 * special cases, like 6to4, are handled in in6_ifattach
2215 */
2216 in6_ifattach(ifp, NULL);
2217 }
2218
2219 int
2220 in6if_do_dad(struct ifnet *ifp)
2221 {
2222 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2223 return (0);
2224
2225 switch (ifp->if_type) {
2226 #ifdef IFT_DUMMY
2227 case IFT_DUMMY:
2228 #endif
2229 case IFT_FAITH:
2230 /*
2231 * These interfaces do not have the IFF_LOOPBACK flag,
2232 * but loop packets back. We do not have to do DAD on such
2233 * interfaces. We should even omit it, because loop-backed
2234 * NS would confuse the DAD procedure.
2235 */
2236 return (0);
2237 default:
2238 /*
2239 * Our DAD routine requires the interface up and running.
2240 * However, some interfaces can be up before the RUNNING
2241 * status. Additionaly, users may try to assign addresses
2242 * before the interface becomes up (or running).
2243 * We simply skip DAD in such a case as a work around.
2244 * XXX: we should rather mark "tentative" on such addresses,
2245 * and do DAD after the interface becomes ready.
2246 */
2247 if (!((ifp->if_flags & IFF_UP) &&
2248 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2249 return (0);
2250
2251 return (1);
2252 }
2253 }
2254
2255 /*
2256 * Calculate max IPv6 MTU through all the interfaces and store it
2257 * to in6_maxmtu.
2258 */
2259 void
2260 in6_setmaxmtu(void)
2261 {
2262 unsigned long maxmtu = 0;
2263 struct ifnet *ifp;
2264
2265 IFNET_RLOCK_NOSLEEP();
2266 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2267 /* this function can be called during ifnet initialization */
2268 if (!ifp->if_afdata[AF_INET6])
2269 continue;
2270 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2271 IN6_LINKMTU(ifp) > maxmtu)
2272 maxmtu = IN6_LINKMTU(ifp);
2273 }
2274 IFNET_RUNLOCK_NOSLEEP();
2275 if (maxmtu) /* update only when maxmtu is positive */
2276 V_in6_maxmtu = maxmtu;
2277 }
2278
2279 /*
2280 * Provide the length of interface identifiers to be used for the link attached
2281 * to the given interface. The length should be defined in "IPv6 over
2282 * xxx-link" document. Note that address architecture might also define
2283 * the length for a particular set of address prefixes, regardless of the
2284 * link type. As clarified in rfc2462bis, those two definitions should be
2285 * consistent, and those really are as of August 2004.
2286 */
2287 int
2288 in6_if2idlen(struct ifnet *ifp)
2289 {
2290 switch (ifp->if_type) {
2291 case IFT_ETHER: /* RFC2464 */
2292 #ifdef IFT_PROPVIRTUAL
2293 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2294 #endif
2295 #ifdef IFT_L2VLAN
2296 case IFT_L2VLAN: /* ditto */
2297 #endif
2298 #ifdef IFT_IEEE80211
2299 case IFT_IEEE80211: /* ditto */
2300 #endif
2301 #ifdef IFT_MIP
2302 case IFT_MIP: /* ditto */
2303 #endif
2304 return (64);
2305 case IFT_FDDI: /* RFC2467 */
2306 return (64);
2307 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2308 return (64);
2309 case IFT_PPP: /* RFC2472 */
2310 return (64);
2311 case IFT_ARCNET: /* RFC2497 */
2312 return (64);
2313 case IFT_FRELAY: /* RFC2590 */
2314 return (64);
2315 case IFT_IEEE1394: /* RFC3146 */
2316 return (64);
2317 case IFT_GIF:
2318 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2319 case IFT_LOOP:
2320 return (64); /* XXX: is this really correct? */
2321 default:
2322 /*
2323 * Unknown link type:
2324 * It might be controversial to use the today's common constant
2325 * of 64 for these cases unconditionally. For full compliance,
2326 * we should return an error in this case. On the other hand,
2327 * if we simply miss the standard for the link type or a new
2328 * standard is defined for a new link type, the IFID length
2329 * is very likely to be the common constant. As a compromise,
2330 * we always use the constant, but make an explicit notice
2331 * indicating the "unknown" case.
2332 */
2333 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2334 return (64);
2335 }
2336 }
2337
2338 #include <sys/sysctl.h>
2339
2340 struct in6_llentry {
2341 struct llentry base;
2342 struct sockaddr_in6 l3_addr6;
2343 };
2344
2345 static struct llentry *
2346 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2347 {
2348 struct in6_llentry *lle;
2349
2350 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
2351 M_DONTWAIT | M_ZERO);
2352 if (lle == NULL) /* NB: caller generates msg */
2353 return NULL;
2354
2355 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2356 lle->base.lle_refcnt = 1;
2357 LLE_LOCK_INIT(&lle->base);
2358 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2359 CALLOUT_RETURNUNLOCKED);
2360
2361 return &lle->base;
2362 }
2363
2364 /*
2365 * Deletes an address from the address table.
2366 * This function is called by the timer functions
2367 * such as arptimer() and nd6_llinfo_timer(), and
2368 * the caller does the locking.
2369 */
2370 static void
2371 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2372 {
2373 LLE_WUNLOCK(lle);
2374 LLE_LOCK_DESTROY(lle);
2375 free(lle, M_LLTABLE);
2376 }
2377
2378 static void
2379 in6_lltable_prefix_free(struct lltable *llt,
2380 const struct sockaddr *prefix,
2381 const struct sockaddr *mask,
2382 u_int flags)
2383 {
2384 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2385 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2386 struct llentry *lle, *next;
2387 register int i;
2388
2389 /*
2390 * (flags & LLE_STATIC) means deleting all entries
2391 * including static ND6 entries
2392 */
2393 IF_AFDATA_WLOCK(llt->llt_ifp);
2394 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2395 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2396 if (IN6_ARE_MASKED_ADDR_EQUAL(
2397 &satosin6(L3_ADDR(lle))->sin6_addr,
2398 &pfx->sin6_addr, &msk->sin6_addr) &&
2399 ((flags & LLE_STATIC) ||
2400 !(lle->la_flags & LLE_STATIC))) {
2401 LLE_WLOCK(lle);
2402 if (callout_stop(&lle->la_timer))
2403 LLE_REMREF(lle);
2404 llentry_free(lle);
2405 }
2406 }
2407 }
2408 IF_AFDATA_WUNLOCK(llt->llt_ifp);
2409 }
2410
2411 static int
2412 in6_lltable_rtcheck(struct ifnet *ifp,
2413 u_int flags,
2414 const struct sockaddr *l3addr)
2415 {
2416 struct rtentry *rt;
2417 char ip6buf[INET6_ADDRSTRLEN];
2418
2419 KASSERT(l3addr->sa_family == AF_INET6,
2420 ("sin_family %d", l3addr->sa_family));
2421
2422 /* Our local addresses are always only installed on the default FIB. */
2423 /* XXX rtalloc1 should take a const param */
2424 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2425 RT_DEFAULT_FIB);
2426 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2427 struct ifaddr *ifa;
2428 /*
2429 * Create an ND6 cache for an IPv6 neighbor
2430 * that is not covered by our own prefix.
2431 */
2432 /* XXX ifaof_ifpforaddr should take a const param */
2433 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2434 if (ifa != NULL) {
2435 ifa_free(ifa);
2436 if (rt != NULL)
2437 RTFREE_LOCKED(rt);
2438 return 0;
2439 }
2440 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2441 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2442 if (rt != NULL)
2443 RTFREE_LOCKED(rt);
2444 return EINVAL;
2445 }
2446 RTFREE_LOCKED(rt);
2447 return 0;
2448 }
2449
2450 static struct llentry *
2451 in6_lltable_lookup(struct lltable *llt, u_int flags,
2452 const struct sockaddr *l3addr)
2453 {
2454 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2455 struct ifnet *ifp = llt->llt_ifp;
2456 struct llentry *lle;
2457 struct llentries *lleh;
2458 u_int hashkey;
2459
2460 IF_AFDATA_LOCK_ASSERT(ifp);
2461 KASSERT(l3addr->sa_family == AF_INET6,
2462 ("sin_family %d", l3addr->sa_family));
2463
2464 hashkey = sin6->sin6_addr.s6_addr32[3];
2465 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2466 LIST_FOREACH(lle, lleh, lle_next) {
2467 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2468 if (lle->la_flags & LLE_DELETED)
2469 continue;
2470 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2471 sizeof(struct in6_addr)) == 0)
2472 break;
2473 }
2474
2475 if (lle == NULL) {
2476 if (!(flags & LLE_CREATE))
2477 return (NULL);
2478 /*
2479 * A route that covers the given address must have
2480 * been installed 1st because we are doing a resolution,
2481 * verify this.
2482 */
2483 if (!(flags & LLE_IFADDR) &&
2484 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2485 return NULL;
2486
2487 lle = in6_lltable_new(l3addr, flags);
2488 if (lle == NULL) {
2489 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2490 return NULL;
2491 }
2492 lle->la_flags = flags & ~LLE_CREATE;
2493 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2494 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2495 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2496 }
2497
2498 lle->lle_tbl = llt;
2499 lle->lle_head = lleh;
2500 lle->la_flags |= LLE_LINKED;
2501 LIST_INSERT_HEAD(lleh, lle, lle_next);
2502 } else if (flags & LLE_DELETE) {
2503 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2504 LLE_WLOCK(lle);
2505 lle->la_flags |= LLE_DELETED;
2506 #ifdef DIAGNOSTIC
2507 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2508 #endif
2509 if ((lle->la_flags &
2510 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2511 llentry_free(lle);
2512 else
2513 LLE_WUNLOCK(lle);
2514 }
2515 lle = (void *)-1;
2516 }
2517 if (LLE_IS_VALID(lle)) {
2518 if (flags & LLE_EXCLUSIVE)
2519 LLE_WLOCK(lle);
2520 else
2521 LLE_RLOCK(lle);
2522 }
2523 return (lle);
2524 }
2525
2526 static int
2527 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2528 {
2529 struct ifnet *ifp = llt->llt_ifp;
2530 struct llentry *lle;
2531 /* XXX stack use */
2532 struct {
2533 struct rt_msghdr rtm;
2534 struct sockaddr_in6 sin6;
2535 /*
2536 * ndp.c assumes that sdl is word aligned
2537 */
2538 #ifdef __LP64__
2539 uint32_t pad;
2540 #endif
2541 struct sockaddr_dl sdl;
2542 } ndpc;
2543 int i, error;
2544
2545 if (ifp->if_flags & IFF_LOOPBACK)
2546 return 0;
2547
2548 LLTABLE_LOCK_ASSERT();
2549
2550 error = 0;
2551 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2552 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2553 struct sockaddr_dl *sdl;
2554
2555 /* skip deleted or invalid entries */
2556 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2557 continue;
2558 /* Skip if jailed and not a valid IP of the prison. */
2559 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2560 continue;
2561 /*
2562 * produce a msg made of:
2563 * struct rt_msghdr;
2564 * struct sockaddr_in6 (IPv6)
2565 * struct sockaddr_dl;
2566 */
2567 bzero(&ndpc, sizeof(ndpc));
2568 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2569 ndpc.rtm.rtm_version = RTM_VERSION;
2570 ndpc.rtm.rtm_type = RTM_GET;
2571 ndpc.rtm.rtm_flags = RTF_UP;
2572 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2573 ndpc.sin6.sin6_family = AF_INET6;
2574 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2575 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2576
2577 /* publish */
2578 if (lle->la_flags & LLE_PUB)
2579 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2580
2581 sdl = &ndpc.sdl;
2582 sdl->sdl_family = AF_LINK;
2583 sdl->sdl_len = sizeof(*sdl);
2584 sdl->sdl_alen = ifp->if_addrlen;
2585 sdl->sdl_index = ifp->if_index;
2586 sdl->sdl_type = ifp->if_type;
2587 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2588 ndpc.rtm.rtm_rmx.rmx_expire =
2589 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2590 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2591 if (lle->la_flags & LLE_STATIC)
2592 ndpc.rtm.rtm_flags |= RTF_STATIC;
2593 ndpc.rtm.rtm_index = ifp->if_index;
2594 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2595 if (error)
2596 break;
2597 }
2598 }
2599 return error;
2600 }
2601
2602 void *
2603 in6_domifattach(struct ifnet *ifp)
2604 {
2605 struct in6_ifextra *ext;
2606
2607 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2608 bzero(ext, sizeof(*ext));
2609
2610 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2611 M_IFADDR, M_WAITOK);
2612 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2613
2614 ext->icmp6_ifstat =
2615 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2616 M_IFADDR, M_WAITOK);
2617 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2618
2619 ext->nd_ifinfo = nd6_ifattach(ifp);
2620 ext->scope6_id = scope6_ifattach(ifp);
2621 ext->lltable = lltable_init(ifp, AF_INET6);
2622 if (ext->lltable != NULL) {
2623 ext->lltable->llt_free = in6_lltable_free;
2624 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2625 ext->lltable->llt_lookup = in6_lltable_lookup;
2626 ext->lltable->llt_dump = in6_lltable_dump;
2627 }
2628
2629 ext->mld_ifinfo = mld_domifattach(ifp);
2630
2631 return ext;
2632 }
2633
2634 void
2635 in6_domifdetach(struct ifnet *ifp, void *aux)
2636 {
2637 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2638
2639 mld_domifdetach(ifp);
2640 scope6_ifdetach(ext->scope6_id);
2641 nd6_ifdetach(ext->nd_ifinfo);
2642 lltable_free(ext->lltable);
2643 free(ext->in6_ifstat, M_IFADDR);
2644 free(ext->icmp6_ifstat, M_IFADDR);
2645 free(ext, M_IFADDR);
2646 }
2647
2648 /*
2649 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2650 * v4 mapped addr or v4 compat addr
2651 */
2652 void
2653 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2654 {
2655
2656 bzero(sin, sizeof(*sin));
2657 sin->sin_len = sizeof(struct sockaddr_in);
2658 sin->sin_family = AF_INET;
2659 sin->sin_port = sin6->sin6_port;
2660 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2661 }
2662
2663 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2664 void
2665 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2666 {
2667 bzero(sin6, sizeof(*sin6));
2668 sin6->sin6_len = sizeof(struct sockaddr_in6);
2669 sin6->sin6_family = AF_INET6;
2670 sin6->sin6_port = sin->sin_port;
2671 sin6->sin6_addr.s6_addr32[0] = 0;
2672 sin6->sin6_addr.s6_addr32[1] = 0;
2673 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2674 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2675 }
2676
2677 /* Convert sockaddr_in6 into sockaddr_in. */
2678 void
2679 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2680 {
2681 struct sockaddr_in *sin_p;
2682 struct sockaddr_in6 sin6;
2683
2684 /*
2685 * Save original sockaddr_in6 addr and convert it
2686 * to sockaddr_in.
2687 */
2688 sin6 = *(struct sockaddr_in6 *)nam;
2689 sin_p = (struct sockaddr_in *)nam;
2690 in6_sin6_2_sin(sin_p, &sin6);
2691 }
2692
2693 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2694 void
2695 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2696 {
2697 struct sockaddr_in *sin_p;
2698 struct sockaddr_in6 *sin6_p;
2699
2700 sin6_p = malloc(sizeof *sin6_p, M_SONAME,
2701 M_WAITOK);
2702 sin_p = (struct sockaddr_in *)*nam;
2703 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2704 free(*nam, M_SONAME);
2705 *nam = (struct sockaddr *)sin6_p;
2706 }
Cache object: 870f5f6055241e2b913cd680fbbd4f7d
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