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: releng/9.0/sys/netinet6/in6.c 236953 2012-06-12 12:10:10Z bz $");
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 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
140 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
141
142 void
143 in6_ifaddloop(struct ifaddr *ifa)
144 {
145 struct sockaddr_dl gateway;
146 struct sockaddr_in6 mask, addr;
147 struct rtentry rt;
148 struct in6_ifaddr *ia;
149 struct ifnet *ifp;
150 struct llentry *ln;
151
152 ia = ifa2ia6(ifa);
153 ifp = ifa->ifa_ifp;
154 IF_AFDATA_LOCK(ifp);
155 ifa->ifa_rtrequest = NULL;
156
157 /* XXX QL
158 * we need to report rt_newaddrmsg
159 */
160 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
161 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
162 IF_AFDATA_UNLOCK(ifp);
163 if (ln != NULL) {
164 ln->la_expire = 0; /* for IPv6 this means permanent */
165 ln->ln_state = ND6_LLINFO_REACHABLE;
166 /*
167 * initialize for rtmsg generation
168 */
169 bzero(&gateway, sizeof(gateway));
170 gateway.sdl_len = sizeof(gateway);
171 gateway.sdl_family = AF_LINK;
172 gateway.sdl_nlen = 0;
173 gateway.sdl_alen = 6;
174 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
175 sizeof(ln->ll_addr));
176 LLE_WUNLOCK(ln);
177 }
178
179 bzero(&rt, sizeof(rt));
180 rt.rt_gateway = (struct sockaddr *)&gateway;
181 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
182 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
183 rt_mask(&rt) = (struct sockaddr *)&mask;
184 rt_key(&rt) = (struct sockaddr *)&addr;
185 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
186 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
187 }
188
189 void
190 in6_ifremloop(struct ifaddr *ifa)
191 {
192 struct sockaddr_dl gateway;
193 struct sockaddr_in6 mask, addr;
194 struct rtentry rt0;
195 struct in6_ifaddr *ia;
196 struct ifnet *ifp;
197
198 ia = ifa2ia6(ifa);
199 ifp = ifa->ifa_ifp;
200 IF_AFDATA_LOCK(ifp);
201 lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
202 (struct sockaddr *)&ia->ia_addr);
203 IF_AFDATA_UNLOCK(ifp);
204
205 /*
206 * initialize for rtmsg generation
207 */
208 bzero(&gateway, sizeof(gateway));
209 gateway.sdl_len = sizeof(gateway);
210 gateway.sdl_family = AF_LINK;
211 gateway.sdl_nlen = 0;
212 gateway.sdl_alen = ifp->if_addrlen;
213 bzero(&rt0, sizeof(rt0));
214 rt0.rt_gateway = (struct sockaddr *)&gateway;
215 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
216 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
217 rt_mask(&rt0) = (struct sockaddr *)&mask;
218 rt_key(&rt0) = (struct sockaddr *)&addr;
219 rt0.rt_flags = RTF_HOST | RTF_STATIC;
220 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
221 }
222
223 int
224 in6_mask2len(struct in6_addr *mask, u_char *lim0)
225 {
226 int x = 0, y;
227 u_char *lim = lim0, *p;
228
229 /* ignore the scope_id part */
230 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
231 lim = (u_char *)mask + sizeof(*mask);
232 for (p = (u_char *)mask; p < lim; x++, p++) {
233 if (*p != 0xff)
234 break;
235 }
236 y = 0;
237 if (p < lim) {
238 for (y = 0; y < 8; y++) {
239 if ((*p & (0x80 >> y)) == 0)
240 break;
241 }
242 }
243
244 /*
245 * when the limit pointer is given, do a stricter check on the
246 * remaining bits.
247 */
248 if (p < lim) {
249 if (y != 0 && (*p & (0x00ff >> y)) != 0)
250 return (-1);
251 for (p = p + 1; p < lim; p++)
252 if (*p != 0)
253 return (-1);
254 }
255
256 return x * 8 + y;
257 }
258
259 #ifdef COMPAT_FREEBSD32
260 struct in6_ndifreq32 {
261 char ifname[IFNAMSIZ];
262 uint32_t ifindex;
263 };
264 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
265 #endif
266
267 int
268 in6_control(struct socket *so, u_long cmd, caddr_t data,
269 struct ifnet *ifp, struct thread *td)
270 {
271 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
272 struct in6_ifaddr *ia = NULL;
273 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
274 struct sockaddr_in6 *sa6;
275 int error;
276
277 switch (cmd) {
278 case SIOCGETSGCNT_IN6:
279 case SIOCGETMIFCNT_IN6:
280 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
281 }
282
283 switch(cmd) {
284 case SIOCAADDRCTL_POLICY:
285 case SIOCDADDRCTL_POLICY:
286 if (td != NULL) {
287 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
288 if (error)
289 return (error);
290 }
291 return (in6_src_ioctl(cmd, data));
292 }
293
294 if (ifp == NULL)
295 return (EOPNOTSUPP);
296
297 switch (cmd) {
298 case SIOCSNDFLUSH_IN6:
299 case SIOCSPFXFLUSH_IN6:
300 case SIOCSRTRFLUSH_IN6:
301 case SIOCSDEFIFACE_IN6:
302 case SIOCSIFINFO_FLAGS:
303 case SIOCSIFINFO_IN6:
304 if (td != NULL) {
305 error = priv_check(td, PRIV_NETINET_ND6);
306 if (error)
307 return (error);
308 }
309 /* FALLTHROUGH */
310 case OSIOCGIFINFO_IN6:
311 case SIOCGIFINFO_IN6:
312 case SIOCGDRLST_IN6:
313 case SIOCGPRLST_IN6:
314 case SIOCGNBRINFO_IN6:
315 case SIOCGDEFIFACE_IN6:
316 return (nd6_ioctl(cmd, data, ifp));
317
318 #ifdef COMPAT_FREEBSD32
319 case SIOCGDEFIFACE32_IN6:
320 {
321 struct in6_ndifreq ndif;
322 struct in6_ndifreq32 *ndif32;
323
324 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
325 ifp);
326 if (error)
327 return (error);
328 ndif32 = (struct in6_ndifreq32 *)data;
329 ndif32->ifindex = ndif.ifindex;
330 return (0);
331 }
332 #endif
333 }
334
335 switch (cmd) {
336 case SIOCSIFPREFIX_IN6:
337 case SIOCDIFPREFIX_IN6:
338 case SIOCAIFPREFIX_IN6:
339 case SIOCCIFPREFIX_IN6:
340 case SIOCSGIFPREFIX_IN6:
341 case SIOCGIFPREFIX_IN6:
342 log(LOG_NOTICE,
343 "prefix ioctls are now invalidated. "
344 "please use ifconfig.\n");
345 return (EOPNOTSUPP);
346 }
347
348 switch (cmd) {
349 case SIOCSSCOPE6:
350 if (td != NULL) {
351 error = priv_check(td, PRIV_NETINET_SCOPE6);
352 if (error)
353 return (error);
354 }
355 return (scope6_set(ifp,
356 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
357 case SIOCGSCOPE6:
358 return (scope6_get(ifp,
359 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
360 case SIOCGSCOPE6DEF:
361 return (scope6_get_default((struct scope6_id *)
362 ifr->ifr_ifru.ifru_scope_id));
363 }
364
365 switch (cmd) {
366 case SIOCALIFADDR:
367 if (td != NULL) {
368 error = priv_check(td, PRIV_NET_ADDIFADDR);
369 if (error)
370 return (error);
371 }
372 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
373
374 case SIOCDLIFADDR:
375 if (td != NULL) {
376 error = priv_check(td, PRIV_NET_DELIFADDR);
377 if (error)
378 return (error);
379 }
380 /* FALLTHROUGH */
381 case SIOCGLIFADDR:
382 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
383 }
384
385 /*
386 * Find address for this interface, if it exists.
387 *
388 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
389 * only, and used the first interface address as the target of other
390 * operations (without checking ifra_addr). This was because netinet
391 * code/API assumed at most 1 interface address per interface.
392 * Since IPv6 allows a node to assign multiple addresses
393 * on a single interface, we almost always look and check the
394 * presence of ifra_addr, and reject invalid ones here.
395 * It also decreases duplicated code among SIOC*_IN6 operations.
396 */
397 switch (cmd) {
398 case SIOCAIFADDR_IN6:
399 case SIOCSIFPHYADDR_IN6:
400 sa6 = &ifra->ifra_addr;
401 break;
402 case SIOCSIFADDR_IN6:
403 case SIOCGIFADDR_IN6:
404 case SIOCSIFDSTADDR_IN6:
405 case SIOCSIFNETMASK_IN6:
406 case SIOCGIFDSTADDR_IN6:
407 case SIOCGIFNETMASK_IN6:
408 case SIOCDIFADDR_IN6:
409 case SIOCGIFPSRCADDR_IN6:
410 case SIOCGIFPDSTADDR_IN6:
411 case SIOCGIFAFLAG_IN6:
412 case SIOCSNDFLUSH_IN6:
413 case SIOCSPFXFLUSH_IN6:
414 case SIOCSRTRFLUSH_IN6:
415 case SIOCGIFALIFETIME_IN6:
416 case SIOCSIFALIFETIME_IN6:
417 case SIOCGIFSTAT_IN6:
418 case SIOCGIFSTAT_ICMP6:
419 sa6 = &ifr->ifr_addr;
420 break;
421 default:
422 sa6 = NULL;
423 break;
424 }
425 if (sa6 && sa6->sin6_family == AF_INET6) {
426 if (sa6->sin6_scope_id != 0)
427 error = sa6_embedscope(sa6, 0);
428 else
429 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
430 if (error != 0)
431 return (error);
432 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
433 &sa6->sin6_addr)) != 0)
434 return (error);
435 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
436 } else
437 ia = NULL;
438
439 switch (cmd) {
440 case SIOCSIFADDR_IN6:
441 case SIOCSIFDSTADDR_IN6:
442 case SIOCSIFNETMASK_IN6:
443 /*
444 * Since IPv6 allows a node to assign multiple addresses
445 * on a single interface, SIOCSIFxxx ioctls are deprecated.
446 */
447 /* we decided to obsolete this command (20000704) */
448 error = EINVAL;
449 goto out;
450
451 case SIOCDIFADDR_IN6:
452 /*
453 * for IPv4, we look for existing in_ifaddr here to allow
454 * "ifconfig if0 delete" to remove the first IPv4 address on
455 * the interface. For IPv6, as the spec allows multiple
456 * interface address from the day one, we consider "remove the
457 * first one" semantics to be not preferable.
458 */
459 if (ia == NULL) {
460 error = EADDRNOTAVAIL;
461 goto out;
462 }
463 /* FALLTHROUGH */
464 case SIOCAIFADDR_IN6:
465 /*
466 * We always require users to specify a valid IPv6 address for
467 * the corresponding operation.
468 */
469 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
470 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
471 error = EAFNOSUPPORT;
472 goto out;
473 }
474
475 if (td != NULL) {
476 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
477 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
478 if (error)
479 goto out;
480 }
481 break;
482
483 case SIOCGIFADDR_IN6:
484 /* This interface is basically deprecated. use SIOCGIFCONF. */
485 /* FALLTHROUGH */
486 case SIOCGIFAFLAG_IN6:
487 case SIOCGIFNETMASK_IN6:
488 case SIOCGIFDSTADDR_IN6:
489 case SIOCGIFALIFETIME_IN6:
490 /* must think again about its semantics */
491 if (ia == NULL) {
492 error = EADDRNOTAVAIL;
493 goto out;
494 }
495 break;
496
497 case SIOCSIFALIFETIME_IN6:
498 {
499 struct in6_addrlifetime *lt;
500
501 if (td != NULL) {
502 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
503 if (error)
504 goto out;
505 }
506 if (ia == NULL) {
507 error = EADDRNOTAVAIL;
508 goto out;
509 }
510 /* sanity for overflow - beware unsigned */
511 lt = &ifr->ifr_ifru.ifru_lifetime;
512 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
513 lt->ia6t_vltime + time_second < time_second) {
514 error = EINVAL;
515 goto out;
516 }
517 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
518 lt->ia6t_pltime + time_second < time_second) {
519 error = EINVAL;
520 goto out;
521 }
522 break;
523 }
524 }
525
526 switch (cmd) {
527 case SIOCGIFADDR_IN6:
528 ifr->ifr_addr = ia->ia_addr;
529 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
530 goto out;
531 break;
532
533 case SIOCGIFDSTADDR_IN6:
534 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
535 error = EINVAL;
536 goto out;
537 }
538 /*
539 * XXX: should we check if ifa_dstaddr is NULL and return
540 * an error?
541 */
542 ifr->ifr_dstaddr = ia->ia_dstaddr;
543 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
544 goto out;
545 break;
546
547 case SIOCGIFNETMASK_IN6:
548 ifr->ifr_addr = ia->ia_prefixmask;
549 break;
550
551 case SIOCGIFAFLAG_IN6:
552 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
553 break;
554
555 case SIOCGIFSTAT_IN6:
556 if (ifp == NULL) {
557 error = EINVAL;
558 goto out;
559 }
560 bzero(&ifr->ifr_ifru.ifru_stat,
561 sizeof(ifr->ifr_ifru.ifru_stat));
562 ifr->ifr_ifru.ifru_stat =
563 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
564 break;
565
566 case SIOCGIFSTAT_ICMP6:
567 if (ifp == NULL) {
568 error = EINVAL;
569 goto out;
570 }
571 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
572 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
573 ifr->ifr_ifru.ifru_icmp6stat =
574 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
575 break;
576
577 case SIOCGIFALIFETIME_IN6:
578 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
579 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
580 time_t maxexpire;
581 struct in6_addrlifetime *retlt =
582 &ifr->ifr_ifru.ifru_lifetime;
583
584 /*
585 * XXX: adjust expiration time assuming time_t is
586 * signed.
587 */
588 maxexpire = (-1) &
589 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
590 if (ia->ia6_lifetime.ia6t_vltime <
591 maxexpire - ia->ia6_updatetime) {
592 retlt->ia6t_expire = ia->ia6_updatetime +
593 ia->ia6_lifetime.ia6t_vltime;
594 } else
595 retlt->ia6t_expire = maxexpire;
596 }
597 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
598 time_t maxexpire;
599 struct in6_addrlifetime *retlt =
600 &ifr->ifr_ifru.ifru_lifetime;
601
602 /*
603 * XXX: adjust expiration time assuming time_t is
604 * signed.
605 */
606 maxexpire = (-1) &
607 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
608 if (ia->ia6_lifetime.ia6t_pltime <
609 maxexpire - ia->ia6_updatetime) {
610 retlt->ia6t_preferred = ia->ia6_updatetime +
611 ia->ia6_lifetime.ia6t_pltime;
612 } else
613 retlt->ia6t_preferred = maxexpire;
614 }
615 break;
616
617 case SIOCSIFALIFETIME_IN6:
618 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
619 /* for sanity */
620 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
621 ia->ia6_lifetime.ia6t_expire =
622 time_second + ia->ia6_lifetime.ia6t_vltime;
623 } else
624 ia->ia6_lifetime.ia6t_expire = 0;
625 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
626 ia->ia6_lifetime.ia6t_preferred =
627 time_second + ia->ia6_lifetime.ia6t_pltime;
628 } else
629 ia->ia6_lifetime.ia6t_preferred = 0;
630 break;
631
632 case SIOCAIFADDR_IN6:
633 {
634 int i;
635 struct nd_prefixctl pr0;
636 struct nd_prefix *pr;
637
638 /*
639 * first, make or update the interface address structure,
640 * and link it to the list.
641 */
642 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
643 goto out;
644 if (ia != NULL)
645 ifa_free(&ia->ia_ifa);
646 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
647 == NULL) {
648 /*
649 * this can happen when the user specify the 0 valid
650 * lifetime.
651 */
652 break;
653 }
654
655 /*
656 * then, make the prefix on-link on the interface.
657 * XXX: we'd rather create the prefix before the address, but
658 * we need at least one address to install the corresponding
659 * interface route, so we configure the address first.
660 */
661
662 /*
663 * convert mask to prefix length (prefixmask has already
664 * been validated in in6_update_ifa().
665 */
666 bzero(&pr0, sizeof(pr0));
667 pr0.ndpr_ifp = ifp;
668 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
669 NULL);
670 if (pr0.ndpr_plen == 128) {
671 break; /* we don't need to install a host route. */
672 }
673 pr0.ndpr_prefix = ifra->ifra_addr;
674 /* apply the mask for safety. */
675 for (i = 0; i < 4; i++) {
676 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
677 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
678 }
679 /*
680 * XXX: since we don't have an API to set prefix (not address)
681 * lifetimes, we just use the same lifetimes as addresses.
682 * The (temporarily) installed lifetimes can be overridden by
683 * later advertised RAs (when accept_rtadv is non 0), which is
684 * an intended behavior.
685 */
686 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
687 pr0.ndpr_raf_auto =
688 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
689 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
690 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
691
692 /* add the prefix if not yet. */
693 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
694 /*
695 * nd6_prelist_add will install the corresponding
696 * interface route.
697 */
698 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
699 goto out;
700 if (pr == NULL) {
701 log(LOG_ERR, "nd6_prelist_add succeeded but "
702 "no prefix\n");
703 error = EINVAL;
704 goto out;
705 }
706 }
707
708 /* relate the address to the prefix */
709 if (ia->ia6_ndpr == NULL) {
710 ia->ia6_ndpr = pr;
711 pr->ndpr_refcnt++;
712
713 /*
714 * If this is the first autoconf address from the
715 * prefix, create a temporary address as well
716 * (when required).
717 */
718 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
719 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
720 int e;
721 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
722 log(LOG_NOTICE, "in6_control: failed "
723 "to create a temporary address, "
724 "errno=%d\n", e);
725 }
726 }
727 }
728
729 /*
730 * this might affect the status of autoconfigured addresses,
731 * that is, this address might make other addresses detached.
732 */
733 pfxlist_onlink_check();
734 if (error == 0 && ia) {
735 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
736 /*
737 * Try to clear the flag when a new
738 * IPv6 address is added onto an
739 * IFDISABLED interface and it
740 * succeeds.
741 */
742 struct in6_ndireq nd;
743
744 memset(&nd, 0, sizeof(nd));
745 nd.ndi.flags = ND_IFINFO(ifp)->flags;
746 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
747 if (nd6_ioctl(SIOCSIFINFO_FLAGS,
748 (caddr_t)&nd, ifp) < 0)
749 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
750 "SIOCSIFINFO_FLAGS for -ifdisabled "
751 "failed.");
752 /*
753 * Ignore failure of clearing the flag
754 * intentionally. The failure means
755 * address duplication was detected.
756 */
757 }
758 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
759 }
760 break;
761 }
762
763 case SIOCDIFADDR_IN6:
764 {
765 struct nd_prefix *pr;
766
767 /*
768 * If the address being deleted is the only one that owns
769 * the corresponding prefix, expire the prefix as well.
770 * XXX: theoretically, we don't have to worry about such
771 * relationship, since we separate the address management
772 * and the prefix management. We do this, however, to provide
773 * as much backward compatibility as possible in terms of
774 * the ioctl operation.
775 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
776 */
777 pr = ia->ia6_ndpr;
778 in6_purgeaddr(&ia->ia_ifa);
779 if (pr && pr->ndpr_refcnt == 0)
780 prelist_remove(pr);
781 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
782 break;
783 }
784
785 default:
786 if (ifp == NULL || ifp->if_ioctl == 0) {
787 error = EOPNOTSUPP;
788 goto out;
789 }
790 error = (*ifp->if_ioctl)(ifp, cmd, data);
791 goto out;
792 }
793
794 error = 0;
795 out:
796 if (ia != NULL)
797 ifa_free(&ia->ia_ifa);
798 return (error);
799 }
800
801 /*
802 * Update parameters of an IPv6 interface address.
803 * If necessary, a new entry is created and linked into address chains.
804 * This function is separated from in6_control().
805 * XXX: should this be performed under splnet()?
806 */
807 int
808 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
809 struct in6_ifaddr *ia, int flags)
810 {
811 int error = 0, hostIsNew = 0, plen = -1;
812 struct sockaddr_in6 dst6;
813 struct in6_addrlifetime *lt;
814 struct in6_multi_mship *imm;
815 struct in6_multi *in6m_sol;
816 struct rtentry *rt;
817 int delay;
818 char ip6buf[INET6_ADDRSTRLEN];
819
820 /* Validate parameters */
821 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
822 return (EINVAL);
823
824 /*
825 * The destination address for a p2p link must have a family
826 * of AF_UNSPEC or AF_INET6.
827 */
828 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
829 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
830 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
831 return (EAFNOSUPPORT);
832 /*
833 * validate ifra_prefixmask. don't check sin6_family, netmask
834 * does not carry fields other than sin6_len.
835 */
836 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
837 return (EINVAL);
838 /*
839 * Because the IPv6 address architecture is classless, we require
840 * users to specify a (non 0) prefix length (mask) for a new address.
841 * We also require the prefix (when specified) mask is valid, and thus
842 * reject a non-consecutive mask.
843 */
844 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
845 return (EINVAL);
846 if (ifra->ifra_prefixmask.sin6_len != 0) {
847 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
848 (u_char *)&ifra->ifra_prefixmask +
849 ifra->ifra_prefixmask.sin6_len);
850 if (plen <= 0)
851 return (EINVAL);
852 } else {
853 /*
854 * In this case, ia must not be NULL. We just use its prefix
855 * length.
856 */
857 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
858 }
859 /*
860 * If the destination address on a p2p interface is specified,
861 * and the address is a scoped one, validate/set the scope
862 * zone identifier.
863 */
864 dst6 = ifra->ifra_dstaddr;
865 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
866 (dst6.sin6_family == AF_INET6)) {
867 struct in6_addr in6_tmp;
868 u_int32_t zoneid;
869
870 in6_tmp = dst6.sin6_addr;
871 if (in6_setscope(&in6_tmp, ifp, &zoneid))
872 return (EINVAL); /* XXX: should be impossible */
873
874 if (dst6.sin6_scope_id != 0) {
875 if (dst6.sin6_scope_id != zoneid)
876 return (EINVAL);
877 } else /* user omit to specify the ID. */
878 dst6.sin6_scope_id = zoneid;
879
880 /* convert into the internal form */
881 if (sa6_embedscope(&dst6, 0))
882 return (EINVAL); /* XXX: should be impossible */
883 }
884 /*
885 * The destination address can be specified only for a p2p or a
886 * loopback interface. If specified, the corresponding prefix length
887 * must be 128.
888 */
889 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
890 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
891 /* XXX: noisy message */
892 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
893 "be specified for a p2p or a loopback IF only\n"));
894 return (EINVAL);
895 }
896 if (plen != 128) {
897 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
898 "be 128 when dstaddr is specified\n"));
899 return (EINVAL);
900 }
901 }
902 /* lifetime consistency check */
903 lt = &ifra->ifra_lifetime;
904 if (lt->ia6t_pltime > lt->ia6t_vltime)
905 return (EINVAL);
906 if (lt->ia6t_vltime == 0) {
907 /*
908 * the following log might be noisy, but this is a typical
909 * configuration mistake or a tool's bug.
910 */
911 nd6log((LOG_INFO,
912 "in6_update_ifa: valid lifetime is 0 for %s\n",
913 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
914
915 if (ia == NULL)
916 return (0); /* there's nothing to do */
917 }
918
919 /*
920 * If this is a new address, allocate a new ifaddr and link it
921 * into chains.
922 */
923 if (ia == NULL) {
924 hostIsNew = 1;
925 /*
926 * When in6_update_ifa() is called in a process of a received
927 * RA, it is called under an interrupt context. So, we should
928 * call malloc with M_NOWAIT.
929 */
930 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
931 M_NOWAIT);
932 if (ia == NULL)
933 return (ENOBUFS);
934 bzero((caddr_t)ia, sizeof(*ia));
935 ifa_init(&ia->ia_ifa);
936 LIST_INIT(&ia->ia6_memberships);
937 /* Initialize the address and masks, and put time stamp */
938 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
939 ia->ia_addr.sin6_family = AF_INET6;
940 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
941 ia->ia6_createtime = time_second;
942 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
943 /*
944 * XXX: some functions expect that ifa_dstaddr is not
945 * NULL for p2p interfaces.
946 */
947 ia->ia_ifa.ifa_dstaddr =
948 (struct sockaddr *)&ia->ia_dstaddr;
949 } else {
950 ia->ia_ifa.ifa_dstaddr = NULL;
951 }
952 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
953 ia->ia_ifp = ifp;
954 ifa_ref(&ia->ia_ifa); /* if_addrhead */
955 IF_ADDR_LOCK(ifp);
956 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
957 IF_ADDR_UNLOCK(ifp);
958
959 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
960 IN6_IFADDR_WLOCK();
961 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
962 IN6_IFADDR_WUNLOCK();
963 }
964
965 /* update timestamp */
966 ia->ia6_updatetime = time_second;
967
968 /* set prefix mask */
969 if (ifra->ifra_prefixmask.sin6_len) {
970 /*
971 * We prohibit changing the prefix length of an existing
972 * address, because
973 * + such an operation should be rare in IPv6, and
974 * + the operation would confuse prefix management.
975 */
976 if (ia->ia_prefixmask.sin6_len &&
977 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
978 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
979 " existing (%s) address should not be changed\n",
980 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
981 error = EINVAL;
982 goto unlink;
983 }
984 ia->ia_prefixmask = ifra->ifra_prefixmask;
985 }
986
987 /*
988 * If a new destination address is specified, scrub the old one and
989 * install the new destination. Note that the interface must be
990 * p2p or loopback (see the check above.)
991 */
992 if (dst6.sin6_family == AF_INET6 &&
993 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
994 int e;
995
996 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
997 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
998 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
999 "a route to the old destination: %s\n",
1000 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1001 /* proceed anyway... */
1002 } else
1003 ia->ia_flags &= ~IFA_ROUTE;
1004 ia->ia_dstaddr = dst6;
1005 }
1006
1007 /*
1008 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1009 * to see if the address is deprecated or invalidated, but initialize
1010 * these members for applications.
1011 */
1012 ia->ia6_lifetime = ifra->ifra_lifetime;
1013 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1014 ia->ia6_lifetime.ia6t_expire =
1015 time_second + ia->ia6_lifetime.ia6t_vltime;
1016 } else
1017 ia->ia6_lifetime.ia6t_expire = 0;
1018 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1019 ia->ia6_lifetime.ia6t_preferred =
1020 time_second + ia->ia6_lifetime.ia6t_pltime;
1021 } else
1022 ia->ia6_lifetime.ia6t_preferred = 0;
1023
1024 /* reset the interface and routing table appropriately. */
1025 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1026 goto unlink;
1027
1028 /*
1029 * configure address flags.
1030 */
1031 ia->ia6_flags = ifra->ifra_flags;
1032 /*
1033 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1034 * userland, make it deprecated.
1035 */
1036 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1037 ia->ia6_lifetime.ia6t_pltime = 0;
1038 ia->ia6_lifetime.ia6t_preferred = time_second;
1039 }
1040 /*
1041 * Make the address tentative before joining multicast addresses,
1042 * so that corresponding MLD responses would not have a tentative
1043 * source address.
1044 */
1045 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1046 if (hostIsNew && in6if_do_dad(ifp))
1047 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1048
1049 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1050 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1051 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1052
1053 /*
1054 * We are done if we have simply modified an existing address.
1055 */
1056 if (!hostIsNew)
1057 return (error);
1058
1059 /*
1060 * Beyond this point, we should call in6_purgeaddr upon an error,
1061 * not just go to unlink.
1062 */
1063
1064 /* Join necessary multicast groups */
1065 in6m_sol = NULL;
1066 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1067 struct sockaddr_in6 mltaddr, mltmask;
1068 struct in6_addr llsol;
1069
1070 /* join solicited multicast addr for new host id */
1071 bzero(&llsol, sizeof(struct in6_addr));
1072 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
1073 llsol.s6_addr32[1] = 0;
1074 llsol.s6_addr32[2] = htonl(1);
1075 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
1076 llsol.s6_addr8[12] = 0xff;
1077 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
1078 /* XXX: should not happen */
1079 log(LOG_ERR, "in6_update_ifa: "
1080 "in6_setscope failed\n");
1081 goto cleanup;
1082 }
1083 delay = 0;
1084 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1085 /*
1086 * We need a random delay for DAD on the address
1087 * being configured. It also means delaying
1088 * transmission of the corresponding MLD report to
1089 * avoid report collision.
1090 * [RFC 4861, Section 6.3.7]
1091 */
1092 delay = arc4random() %
1093 (MAX_RTR_SOLICITATION_DELAY * hz);
1094 }
1095 imm = in6_joingroup(ifp, &llsol, &error, delay);
1096 if (imm == NULL) {
1097 nd6log((LOG_WARNING,
1098 "in6_update_ifa: addmulti failed for "
1099 "%s on %s (errno=%d)\n",
1100 ip6_sprintf(ip6buf, &llsol), if_name(ifp),
1101 error));
1102 goto cleanup;
1103 }
1104 LIST_INSERT_HEAD(&ia->ia6_memberships,
1105 imm, i6mm_chain);
1106 in6m_sol = imm->i6mm_maddr;
1107
1108 bzero(&mltmask, sizeof(mltmask));
1109 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1110 mltmask.sin6_family = AF_INET6;
1111 mltmask.sin6_addr = in6mask32;
1112 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
1113
1114 /*
1115 * join link-local all-nodes address
1116 */
1117 bzero(&mltaddr, sizeof(mltaddr));
1118 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1119 mltaddr.sin6_family = AF_INET6;
1120 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1121 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1122 0)
1123 goto cleanup; /* XXX: should not fail */
1124
1125 /*
1126 * XXX: do we really need this automatic routes?
1127 * We should probably reconsider this stuff. Most applications
1128 * actually do not need the routes, since they usually specify
1129 * the outgoing interface.
1130 */
1131 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1132 if (rt) {
1133 /* XXX: only works in !SCOPEDROUTING case. */
1134 if (memcmp(&mltaddr.sin6_addr,
1135 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1136 MLTMASK_LEN)) {
1137 RTFREE_LOCKED(rt);
1138 rt = NULL;
1139 }
1140 }
1141 if (!rt) {
1142 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1143 (struct sockaddr *)&ia->ia_addr,
1144 (struct sockaddr *)&mltmask, RTF_UP,
1145 (struct rtentry **)0);
1146 if (error)
1147 goto cleanup;
1148 } else {
1149 RTFREE_LOCKED(rt);
1150 }
1151
1152 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1153 if (!imm) {
1154 nd6log((LOG_WARNING,
1155 "in6_update_ifa: addmulti failed for "
1156 "%s on %s (errno=%d)\n",
1157 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1158 if_name(ifp), error));
1159 goto cleanup;
1160 }
1161 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1162
1163 /*
1164 * join node information group address
1165 */
1166 delay = 0;
1167 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1168 /*
1169 * The spec doesn't say anything about delay for this
1170 * group, but the same logic should apply.
1171 */
1172 delay = arc4random() %
1173 (MAX_RTR_SOLICITATION_DELAY * hz);
1174 }
1175 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
1176 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
1177 delay); /* XXX jinmei */
1178 if (!imm) {
1179 nd6log((LOG_WARNING, "in6_update_ifa: "
1180 "addmulti failed for %s on %s "
1181 "(errno=%d)\n",
1182 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1183 if_name(ifp), error));
1184 /* XXX not very fatal, go on... */
1185 } else {
1186 LIST_INSERT_HEAD(&ia->ia6_memberships,
1187 imm, i6mm_chain);
1188 }
1189 }
1190
1191 /*
1192 * join interface-local all-nodes address.
1193 * (ff01::1%ifN, and ff01::%ifN/32)
1194 */
1195 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1196 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL))
1197 != 0)
1198 goto cleanup; /* XXX: should not fail */
1199 /* XXX: again, do we really need the route? */
1200 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1201 if (rt) {
1202 if (memcmp(&mltaddr.sin6_addr,
1203 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
1204 MLTMASK_LEN)) {
1205 RTFREE_LOCKED(rt);
1206 rt = NULL;
1207 }
1208 }
1209 if (!rt) {
1210 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
1211 (struct sockaddr *)&ia->ia_addr,
1212 (struct sockaddr *)&mltmask, RTF_UP,
1213 (struct rtentry **)0);
1214 if (error)
1215 goto cleanup;
1216 } else
1217 RTFREE_LOCKED(rt);
1218
1219 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1220 if (!imm) {
1221 nd6log((LOG_WARNING, "in6_update_ifa: "
1222 "addmulti failed for %s on %s "
1223 "(errno=%d)\n",
1224 ip6_sprintf(ip6buf, &mltaddr.sin6_addr),
1225 if_name(ifp), error));
1226 goto cleanup;
1227 }
1228 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1229 #undef MLTMASK_LEN
1230 }
1231
1232 /*
1233 * Perform DAD, if needed.
1234 * XXX It may be of use, if we can administratively
1235 * disable DAD.
1236 */
1237 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1238 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1239 {
1240 int mindelay, maxdelay;
1241
1242 delay = 0;
1243 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1244 /*
1245 * We need to impose a delay before sending an NS
1246 * for DAD. Check if we also needed a delay for the
1247 * corresponding MLD message. If we did, the delay
1248 * should be larger than the MLD delay (this could be
1249 * relaxed a bit, but this simple logic is at least
1250 * safe).
1251 * XXX: Break data hiding guidelines and look at
1252 * state for the solicited multicast group.
1253 */
1254 mindelay = 0;
1255 if (in6m_sol != NULL &&
1256 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1257 mindelay = in6m_sol->in6m_timer;
1258 }
1259 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1260 if (maxdelay - mindelay == 0)
1261 delay = 0;
1262 else {
1263 delay =
1264 (arc4random() % (maxdelay - mindelay)) +
1265 mindelay;
1266 }
1267 }
1268 nd6_dad_start((struct ifaddr *)ia, delay);
1269 }
1270
1271 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1272 ifa_free(&ia->ia_ifa);
1273 return (error);
1274
1275 unlink:
1276 /*
1277 * XXX: if a change of an existing address failed, keep the entry
1278 * anyway.
1279 */
1280 if (hostIsNew) {
1281 in6_unlink_ifa(ia, ifp);
1282 ifa_free(&ia->ia_ifa);
1283 }
1284 return (error);
1285
1286 cleanup:
1287 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1288 ifa_free(&ia->ia_ifa);
1289 in6_purgeaddr(&ia->ia_ifa);
1290 return error;
1291 }
1292
1293 void
1294 in6_purgeaddr(struct ifaddr *ifa)
1295 {
1296 struct ifnet *ifp = ifa->ifa_ifp;
1297 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1298 struct in6_multi_mship *imm;
1299 struct sockaddr_in6 mltaddr, mltmask;
1300 int plen, error;
1301 struct rtentry *rt;
1302 struct ifaddr *ifa0, *nifa;
1303
1304 /*
1305 * find another IPv6 address as the gateway for the
1306 * link-local and node-local all-nodes multicast
1307 * address routes
1308 */
1309 IF_ADDR_LOCK(ifp);
1310 TAILQ_FOREACH_SAFE(ifa0, &ifp->if_addrhead, ifa_link, nifa) {
1311 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1312 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1313 &ia->ia_addr.sin6_addr,
1314 sizeof(struct in6_addr)) == 0)
1315 continue;
1316 else
1317 break;
1318 }
1319 if (ifa0 != NULL)
1320 ifa_ref(ifa0);
1321 IF_ADDR_UNLOCK(ifp);
1322
1323 /*
1324 * Remove the loopback route to the interface address.
1325 * The check for the current setting of "nd6_useloopback"
1326 * is not needed.
1327 */
1328 if (ia->ia_flags & IFA_RTSELF) {
1329 error = ifa_del_loopback_route((struct ifaddr *)ia,
1330 (struct sockaddr *)&ia->ia_addr);
1331 if (error == 0)
1332 ia->ia_flags &= ~IFA_RTSELF;
1333 }
1334
1335 /* stop DAD processing */
1336 nd6_dad_stop(ifa);
1337
1338 in6_ifremloop(ifa);
1339
1340 /*
1341 * leave from multicast groups we have joined for the interface
1342 */
1343 while ((imm = ia->ia6_memberships.lh_first) != NULL) {
1344 LIST_REMOVE(imm, i6mm_chain);
1345 in6_leavegroup(imm);
1346 }
1347
1348 /*
1349 * remove the link-local all-nodes address
1350 */
1351 bzero(&mltmask, sizeof(mltmask));
1352 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1353 mltmask.sin6_family = AF_INET6;
1354 mltmask.sin6_addr = in6mask32;
1355
1356 bzero(&mltaddr, sizeof(mltaddr));
1357 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1358 mltaddr.sin6_family = AF_INET6;
1359 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1360
1361 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1362 0)
1363 goto cleanup;
1364
1365 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1366 if (rt != NULL && rt->rt_gateway != NULL &&
1367 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1368 &ia->ia_addr.sin6_addr,
1369 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1370 /*
1371 * if no more IPv6 address exists on this interface
1372 * then remove the multicast address route
1373 */
1374 if (ifa0 == NULL) {
1375 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr,
1376 sizeof(mltaddr.sin6_addr));
1377 RTFREE_LOCKED(rt);
1378 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
1379 (struct sockaddr *)&ia->ia_addr,
1380 (struct sockaddr *)&mltmask, RTF_UP,
1381 (struct rtentry **)0);
1382 if (error)
1383 log(LOG_INFO, "in6_purgeaddr: link-local all-nodes"
1384 "multicast address deletion error\n");
1385 } else {
1386 /*
1387 * replace the gateway of the route
1388 */
1389 struct sockaddr_in6 sa;
1390
1391 bzero(&sa, sizeof(sa));
1392 sa.sin6_len = sizeof(struct sockaddr_in6);
1393 sa.sin6_family = AF_INET6;
1394 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1395 sizeof(sa.sin6_addr));
1396 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
1397 memcpy(rt->rt_gateway, &sa, sizeof(sa));
1398 RTFREE_LOCKED(rt);
1399 }
1400 } else {
1401 if (rt != NULL)
1402 RTFREE_LOCKED(rt);
1403 }
1404
1405 /*
1406 * remove the node-local all-nodes address
1407 */
1408 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1409 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) !=
1410 0)
1411 goto cleanup;
1412
1413 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL);
1414 if (rt != NULL && rt->rt_gateway != NULL &&
1415 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1416 &ia->ia_addr.sin6_addr,
1417 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1418 /*
1419 * if no more IPv6 address exists on this interface
1420 * then remove the multicast address route
1421 */
1422 if (ifa0 == NULL) {
1423 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr,
1424 sizeof(mltaddr.sin6_addr));
1425
1426 RTFREE_LOCKED(rt);
1427 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr,
1428 (struct sockaddr *)&ia->ia_addr,
1429 (struct sockaddr *)&mltmask, RTF_UP,
1430 (struct rtentry **)0);
1431
1432 if (error)
1433 log(LOG_INFO, "in6_purgeaddr: node-local all-nodes"
1434 "multicast address deletion error\n");
1435 } else {
1436 /*
1437 * replace the gateway of the route
1438 */
1439 struct sockaddr_in6 sa;
1440
1441 bzero(&sa, sizeof(sa));
1442 sa.sin6_len = sizeof(struct sockaddr_in6);
1443 sa.sin6_family = AF_INET6;
1444 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1445 sizeof(sa.sin6_addr));
1446 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL);
1447 memcpy(rt->rt_gateway, &sa, sizeof(sa));
1448 RTFREE_LOCKED(rt);
1449 }
1450 } else {
1451 if (rt != NULL)
1452 RTFREE_LOCKED(rt);
1453 }
1454
1455 cleanup:
1456 if (ifa0 != NULL)
1457 ifa_free(ifa0);
1458
1459 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1460 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1461 int error;
1462 struct sockaddr *dstaddr;
1463
1464 /*
1465 * use the interface address if configuring an
1466 * interface address with a /128 prefix len
1467 */
1468 if (ia->ia_dstaddr.sin6_family == AF_INET6)
1469 dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
1470 else
1471 dstaddr = (struct sockaddr *)&ia->ia_addr;
1472
1473 error = rtrequest(RTM_DELETE,
1474 (struct sockaddr *)dstaddr,
1475 (struct sockaddr *)&ia->ia_addr,
1476 (struct sockaddr *)&ia->ia_prefixmask,
1477 ia->ia_flags | RTF_HOST, NULL);
1478 if (error != 0)
1479 return;
1480 ia->ia_flags &= ~IFA_ROUTE;
1481 }
1482
1483 in6_unlink_ifa(ia, ifp);
1484 }
1485
1486 static void
1487 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1488 {
1489 int s = splnet();
1490
1491 IF_ADDR_LOCK(ifp);
1492 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1493 IF_ADDR_UNLOCK(ifp);
1494 ifa_free(&ia->ia_ifa); /* if_addrhead */
1495
1496 /*
1497 * Defer the release of what might be the last reference to the
1498 * in6_ifaddr so that it can't be freed before the remainder of the
1499 * cleanup.
1500 */
1501 IN6_IFADDR_WLOCK();
1502 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1503 IN6_IFADDR_WUNLOCK();
1504
1505 /*
1506 * Release the reference to the base prefix. There should be a
1507 * positive reference.
1508 */
1509 if (ia->ia6_ndpr == NULL) {
1510 nd6log((LOG_NOTICE,
1511 "in6_unlink_ifa: autoconf'ed address "
1512 "%p has no prefix\n", ia));
1513 } else {
1514 ia->ia6_ndpr->ndpr_refcnt--;
1515 ia->ia6_ndpr = NULL;
1516 }
1517
1518 /*
1519 * Also, if the address being removed is autoconf'ed, call
1520 * pfxlist_onlink_check() since the release might affect the status of
1521 * other (detached) addresses.
1522 */
1523 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1524 pfxlist_onlink_check();
1525 }
1526 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1527 splx(s);
1528 }
1529
1530 void
1531 in6_purgeif(struct ifnet *ifp)
1532 {
1533 struct ifaddr *ifa, *nifa;
1534
1535 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1536 if (ifa->ifa_addr->sa_family != AF_INET6)
1537 continue;
1538 in6_purgeaddr(ifa);
1539 }
1540
1541 in6_ifdetach(ifp);
1542 }
1543
1544 /*
1545 * SIOC[GAD]LIFADDR.
1546 * SIOCGLIFADDR: get first address. (?)
1547 * SIOCGLIFADDR with IFLR_PREFIX:
1548 * get first address that matches the specified prefix.
1549 * SIOCALIFADDR: add the specified address.
1550 * SIOCALIFADDR with IFLR_PREFIX:
1551 * add the specified prefix, filling hostid part from
1552 * the first link-local address. prefixlen must be <= 64.
1553 * SIOCDLIFADDR: delete the specified address.
1554 * SIOCDLIFADDR with IFLR_PREFIX:
1555 * delete the first address that matches the specified prefix.
1556 * return values:
1557 * EINVAL on invalid parameters
1558 * EADDRNOTAVAIL on prefix match failed/specified address not found
1559 * other values may be returned from in6_ioctl()
1560 *
1561 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1562 * this is to accomodate address naming scheme other than RFC2374,
1563 * in the future.
1564 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1565 * address encoding scheme. (see figure on page 8)
1566 */
1567 static int
1568 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1569 struct ifnet *ifp, struct thread *td)
1570 {
1571 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1572 struct ifaddr *ifa;
1573 struct sockaddr *sa;
1574
1575 /* sanity checks */
1576 if (!data || !ifp) {
1577 panic("invalid argument to in6_lifaddr_ioctl");
1578 /* NOTREACHED */
1579 }
1580
1581 switch (cmd) {
1582 case SIOCGLIFADDR:
1583 /* address must be specified on GET with IFLR_PREFIX */
1584 if ((iflr->flags & IFLR_PREFIX) == 0)
1585 break;
1586 /* FALLTHROUGH */
1587 case SIOCALIFADDR:
1588 case SIOCDLIFADDR:
1589 /* address must be specified on ADD and DELETE */
1590 sa = (struct sockaddr *)&iflr->addr;
1591 if (sa->sa_family != AF_INET6)
1592 return EINVAL;
1593 if (sa->sa_len != sizeof(struct sockaddr_in6))
1594 return EINVAL;
1595 /* XXX need improvement */
1596 sa = (struct sockaddr *)&iflr->dstaddr;
1597 if (sa->sa_family && sa->sa_family != AF_INET6)
1598 return EINVAL;
1599 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1600 return EINVAL;
1601 break;
1602 default: /* shouldn't happen */
1603 #if 0
1604 panic("invalid cmd to in6_lifaddr_ioctl");
1605 /* NOTREACHED */
1606 #else
1607 return EOPNOTSUPP;
1608 #endif
1609 }
1610 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1611 return EINVAL;
1612
1613 switch (cmd) {
1614 case SIOCALIFADDR:
1615 {
1616 struct in6_aliasreq ifra;
1617 struct in6_addr *hostid = NULL;
1618 int prefixlen;
1619
1620 ifa = NULL;
1621 if ((iflr->flags & IFLR_PREFIX) != 0) {
1622 struct sockaddr_in6 *sin6;
1623
1624 /*
1625 * hostid is to fill in the hostid part of the
1626 * address. hostid points to the first link-local
1627 * address attached to the interface.
1628 */
1629 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1630 if (!ifa)
1631 return EADDRNOTAVAIL;
1632 hostid = IFA_IN6(ifa);
1633
1634 /* prefixlen must be <= 64. */
1635 if (64 < iflr->prefixlen) {
1636 if (ifa != NULL)
1637 ifa_free(ifa);
1638 return EINVAL;
1639 }
1640 prefixlen = iflr->prefixlen;
1641
1642 /* hostid part must be zero. */
1643 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1644 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1645 sin6->sin6_addr.s6_addr32[3] != 0) {
1646 if (ifa != NULL)
1647 ifa_free(ifa);
1648 return EINVAL;
1649 }
1650 } else
1651 prefixlen = iflr->prefixlen;
1652
1653 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1654 bzero(&ifra, sizeof(ifra));
1655 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1656
1657 bcopy(&iflr->addr, &ifra.ifra_addr,
1658 ((struct sockaddr *)&iflr->addr)->sa_len);
1659 if (hostid) {
1660 /* fill in hostid part */
1661 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1662 hostid->s6_addr32[2];
1663 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1664 hostid->s6_addr32[3];
1665 }
1666
1667 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1668 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1669 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1670 if (hostid) {
1671 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1672 hostid->s6_addr32[2];
1673 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1674 hostid->s6_addr32[3];
1675 }
1676 }
1677 if (ifa != NULL)
1678 ifa_free(ifa);
1679
1680 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1681 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1682
1683 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1684 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1685 }
1686 case SIOCGLIFADDR:
1687 case SIOCDLIFADDR:
1688 {
1689 struct in6_ifaddr *ia;
1690 struct in6_addr mask, candidate, match;
1691 struct sockaddr_in6 *sin6;
1692 int cmp;
1693
1694 bzero(&mask, sizeof(mask));
1695 if (iflr->flags & IFLR_PREFIX) {
1696 /* lookup a prefix rather than address. */
1697 in6_prefixlen2mask(&mask, iflr->prefixlen);
1698
1699 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1700 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1701 match.s6_addr32[0] &= mask.s6_addr32[0];
1702 match.s6_addr32[1] &= mask.s6_addr32[1];
1703 match.s6_addr32[2] &= mask.s6_addr32[2];
1704 match.s6_addr32[3] &= mask.s6_addr32[3];
1705
1706 /* if you set extra bits, that's wrong */
1707 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1708 return EINVAL;
1709
1710 cmp = 1;
1711 } else {
1712 if (cmd == SIOCGLIFADDR) {
1713 /* on getting an address, take the 1st match */
1714 cmp = 0; /* XXX */
1715 } else {
1716 /* on deleting an address, do exact match */
1717 in6_prefixlen2mask(&mask, 128);
1718 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1719 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1720
1721 cmp = 1;
1722 }
1723 }
1724
1725 IF_ADDR_LOCK(ifp);
1726 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1727 if (ifa->ifa_addr->sa_family != AF_INET6)
1728 continue;
1729 if (!cmp)
1730 break;
1731
1732 /*
1733 * XXX: this is adhoc, but is necessary to allow
1734 * a user to specify fe80::/64 (not /10) for a
1735 * link-local address.
1736 */
1737 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1738 in6_clearscope(&candidate);
1739 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1740 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1741 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1742 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1743 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1744 break;
1745 }
1746 IF_ADDR_UNLOCK(ifp);
1747 if (!ifa)
1748 return EADDRNOTAVAIL;
1749 ia = ifa2ia6(ifa);
1750
1751 if (cmd == SIOCGLIFADDR) {
1752 int error;
1753
1754 /* fill in the if_laddrreq structure */
1755 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1756 error = sa6_recoverscope(
1757 (struct sockaddr_in6 *)&iflr->addr);
1758 if (error != 0)
1759 return (error);
1760
1761 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1762 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1763 ia->ia_dstaddr.sin6_len);
1764 error = sa6_recoverscope(
1765 (struct sockaddr_in6 *)&iflr->dstaddr);
1766 if (error != 0)
1767 return (error);
1768 } else
1769 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1770
1771 iflr->prefixlen =
1772 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1773
1774 iflr->flags = ia->ia6_flags; /* XXX */
1775
1776 return 0;
1777 } else {
1778 struct in6_aliasreq ifra;
1779
1780 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1781 bzero(&ifra, sizeof(ifra));
1782 bcopy(iflr->iflr_name, ifra.ifra_name,
1783 sizeof(ifra.ifra_name));
1784
1785 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1786 ia->ia_addr.sin6_len);
1787 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1788 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1789 ia->ia_dstaddr.sin6_len);
1790 } else {
1791 bzero(&ifra.ifra_dstaddr,
1792 sizeof(ifra.ifra_dstaddr));
1793 }
1794 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1795 ia->ia_prefixmask.sin6_len);
1796
1797 ifra.ifra_flags = ia->ia6_flags;
1798 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1799 ifp, td);
1800 }
1801 }
1802 }
1803
1804 return EOPNOTSUPP; /* just for safety */
1805 }
1806
1807 /*
1808 * Initialize an interface's intetnet6 address
1809 * and routing table entry.
1810 */
1811 static int
1812 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1813 struct sockaddr_in6 *sin6, int newhost)
1814 {
1815 int error = 0, plen, ifacount = 0;
1816 int s = splimp();
1817 struct ifaddr *ifa;
1818
1819 /*
1820 * Give the interface a chance to initialize
1821 * if this is its first address,
1822 * and to validate the address if necessary.
1823 */
1824 IF_ADDR_LOCK(ifp);
1825 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1826 if (ifa->ifa_addr->sa_family != AF_INET6)
1827 continue;
1828 ifacount++;
1829 }
1830 IF_ADDR_UNLOCK(ifp);
1831
1832 ia->ia_addr = *sin6;
1833
1834 if (ifacount <= 1 && ifp->if_ioctl) {
1835 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1836 if (error) {
1837 splx(s);
1838 return (error);
1839 }
1840 }
1841 splx(s);
1842
1843 ia->ia_ifa.ifa_metric = ifp->if_metric;
1844
1845 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1846
1847 /*
1848 * Special case:
1849 * If a new destination address is specified for a point-to-point
1850 * interface, install a route to the destination as an interface
1851 * direct route.
1852 * XXX: the logic below rejects assigning multiple addresses on a p2p
1853 * interface that share the same destination.
1854 */
1855 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1856 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1857 ia->ia_dstaddr.sin6_family == AF_INET6) {
1858 int rtflags = RTF_UP | RTF_HOST;
1859
1860 error = rtrequest(RTM_ADD,
1861 (struct sockaddr *)&ia->ia_dstaddr,
1862 (struct sockaddr *)&ia->ia_addr,
1863 (struct sockaddr *)&ia->ia_prefixmask,
1864 ia->ia_flags | rtflags, NULL);
1865 if (error != 0)
1866 return (error);
1867 ia->ia_flags |= IFA_ROUTE;
1868 /*
1869 * Handle the case for ::1 .
1870 */
1871 if (ifp->if_flags & IFF_LOOPBACK)
1872 ia->ia_flags |= IFA_RTSELF;
1873 }
1874
1875 /*
1876 * add a loopback route to self
1877 */
1878 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1879 error = ifa_add_loopback_route((struct ifaddr *)ia,
1880 (struct sockaddr *)&ia->ia_addr);
1881 if (error == 0)
1882 ia->ia_flags |= IFA_RTSELF;
1883 }
1884
1885 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1886 if (newhost)
1887 in6_ifaddloop(&(ia->ia_ifa));
1888
1889 return (error);
1890 }
1891
1892 /*
1893 * Find an IPv6 interface link-local address specific to an interface.
1894 * ifaddr is returned referenced.
1895 */
1896 struct in6_ifaddr *
1897 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1898 {
1899 struct ifaddr *ifa;
1900
1901 IF_ADDR_LOCK(ifp);
1902 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1903 if (ifa->ifa_addr->sa_family != AF_INET6)
1904 continue;
1905 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1906 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1907 ignoreflags) != 0)
1908 continue;
1909 ifa_ref(ifa);
1910 break;
1911 }
1912 }
1913 IF_ADDR_UNLOCK(ifp);
1914
1915 return ((struct in6_ifaddr *)ifa);
1916 }
1917
1918
1919 /*
1920 * find the internet address corresponding to a given interface and address.
1921 * ifaddr is returned referenced.
1922 */
1923 struct in6_ifaddr *
1924 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1925 {
1926 struct ifaddr *ifa;
1927
1928 IF_ADDR_LOCK(ifp);
1929 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1930 if (ifa->ifa_addr->sa_family != AF_INET6)
1931 continue;
1932 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1933 ifa_ref(ifa);
1934 break;
1935 }
1936 }
1937 IF_ADDR_UNLOCK(ifp);
1938
1939 return ((struct in6_ifaddr *)ifa);
1940 }
1941
1942 /*
1943 * Convert IP6 address to printable (loggable) representation. Caller
1944 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1945 */
1946 static char digits[] = "0123456789abcdef";
1947 char *
1948 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1949 {
1950 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1951 char *cp;
1952 const u_int16_t *a = (const u_int16_t *)addr;
1953 const u_int8_t *d;
1954 int dcolon = 0, zero = 0;
1955
1956 cp = ip6buf;
1957
1958 for (i = 0; i < 8; i++) {
1959 if (*(a + i) == 0) {
1960 cnt++;
1961 if (cnt == 1)
1962 idx = i;
1963 }
1964 else if (maxcnt < cnt) {
1965 maxcnt = cnt;
1966 index = idx;
1967 cnt = 0;
1968 }
1969 }
1970 if (maxcnt < cnt) {
1971 maxcnt = cnt;
1972 index = idx;
1973 }
1974
1975 for (i = 0; i < 8; i++) {
1976 if (dcolon == 1) {
1977 if (*a == 0) {
1978 if (i == 7)
1979 *cp++ = ':';
1980 a++;
1981 continue;
1982 } else
1983 dcolon = 2;
1984 }
1985 if (*a == 0) {
1986 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1987 if (i == 0)
1988 *cp++ = ':';
1989 *cp++ = ':';
1990 dcolon = 1;
1991 } else {
1992 *cp++ = '';
1993 *cp++ = ':';
1994 }
1995 a++;
1996 continue;
1997 }
1998 d = (const u_char *)a;
1999 /* Try to eliminate leading zeros in printout like in :0001. */
2000 zero = 1;
2001 *cp = digits[*d >> 4];
2002 if (*cp != '') {
2003 zero = 0;
2004 cp++;
2005 }
2006 *cp = digits[*d++ & 0xf];
2007 if (zero == 0 || (*cp != '')) {
2008 zero = 0;
2009 cp++;
2010 }
2011 *cp = digits[*d >> 4];
2012 if (zero == 0 || (*cp != '')) {
2013 zero = 0;
2014 cp++;
2015 }
2016 *cp++ = digits[*d & 0xf];
2017 *cp++ = ':';
2018 a++;
2019 }
2020 *--cp = '\0';
2021 return (ip6buf);
2022 }
2023
2024 int
2025 in6_localaddr(struct in6_addr *in6)
2026 {
2027 struct in6_ifaddr *ia;
2028
2029 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2030 return 1;
2031
2032 IN6_IFADDR_RLOCK();
2033 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2034 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2035 &ia->ia_prefixmask.sin6_addr)) {
2036 IN6_IFADDR_RUNLOCK();
2037 return 1;
2038 }
2039 }
2040 IN6_IFADDR_RUNLOCK();
2041
2042 return (0);
2043 }
2044
2045 /*
2046 * Return 1 if an internet address is for the local host and configured
2047 * on one of its interfaces.
2048 */
2049 int
2050 in6_localip(struct in6_addr *in6)
2051 {
2052 struct in6_ifaddr *ia;
2053
2054 IN6_IFADDR_RLOCK();
2055 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2056 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2057 IN6_IFADDR_RUNLOCK();
2058 return (1);
2059 }
2060 }
2061 IN6_IFADDR_RUNLOCK();
2062 return (0);
2063 }
2064
2065
2066 int
2067 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2068 {
2069 struct in6_ifaddr *ia;
2070
2071 IN6_IFADDR_RLOCK();
2072 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2073 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2074 &sa6->sin6_addr) &&
2075 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2076 IN6_IFADDR_RUNLOCK();
2077 return (1); /* true */
2078 }
2079
2080 /* XXX: do we still have to go thru the rest of the list? */
2081 }
2082 IN6_IFADDR_RUNLOCK();
2083
2084 return (0); /* false */
2085 }
2086
2087 /*
2088 * return length of part which dst and src are equal
2089 * hard coding...
2090 */
2091 int
2092 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2093 {
2094 int match = 0;
2095 u_char *s = (u_char *)src, *d = (u_char *)dst;
2096 u_char *lim = s + 16, r;
2097
2098 while (s < lim)
2099 if ((r = (*d++ ^ *s++)) != 0) {
2100 while (r < 128) {
2101 match++;
2102 r <<= 1;
2103 }
2104 break;
2105 } else
2106 match += 8;
2107 return match;
2108 }
2109
2110 /* XXX: to be scope conscious */
2111 int
2112 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2113 {
2114 int bytelen, bitlen;
2115
2116 /* sanity check */
2117 if (0 > len || len > 128) {
2118 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2119 len);
2120 return (0);
2121 }
2122
2123 bytelen = len / 8;
2124 bitlen = len % 8;
2125
2126 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2127 return (0);
2128 if (bitlen != 0 &&
2129 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2130 p2->s6_addr[bytelen] >> (8 - bitlen))
2131 return (0);
2132
2133 return (1);
2134 }
2135
2136 void
2137 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2138 {
2139 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2140 int bytelen, bitlen, i;
2141
2142 /* sanity check */
2143 if (0 > len || len > 128) {
2144 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2145 len);
2146 return;
2147 }
2148
2149 bzero(maskp, sizeof(*maskp));
2150 bytelen = len / 8;
2151 bitlen = len % 8;
2152 for (i = 0; i < bytelen; i++)
2153 maskp->s6_addr[i] = 0xff;
2154 if (bitlen)
2155 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2156 }
2157
2158 /*
2159 * return the best address out of the same scope. if no address was
2160 * found, return the first valid address from designated IF.
2161 */
2162 struct in6_ifaddr *
2163 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2164 {
2165 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2166 struct ifaddr *ifa;
2167 struct in6_ifaddr *besta = 0;
2168 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2169
2170 dep[0] = dep[1] = NULL;
2171
2172 /*
2173 * We first look for addresses in the same scope.
2174 * If there is one, return it.
2175 * If two or more, return one which matches the dst longest.
2176 * If none, return one of global addresses assigned other ifs.
2177 */
2178 IF_ADDR_LOCK(ifp);
2179 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2180 if (ifa->ifa_addr->sa_family != AF_INET6)
2181 continue;
2182 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2183 continue; /* XXX: is there any case to allow anycast? */
2184 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2185 continue; /* don't use this interface */
2186 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2187 continue;
2188 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2189 if (V_ip6_use_deprecated)
2190 dep[0] = (struct in6_ifaddr *)ifa;
2191 continue;
2192 }
2193
2194 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2195 /*
2196 * call in6_matchlen() as few as possible
2197 */
2198 if (besta) {
2199 if (blen == -1)
2200 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2201 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2202 if (tlen > blen) {
2203 blen = tlen;
2204 besta = (struct in6_ifaddr *)ifa;
2205 }
2206 } else
2207 besta = (struct in6_ifaddr *)ifa;
2208 }
2209 }
2210 if (besta) {
2211 ifa_ref(&besta->ia_ifa);
2212 IF_ADDR_UNLOCK(ifp);
2213 return (besta);
2214 }
2215 IF_ADDR_UNLOCK(ifp);
2216
2217 IN6_IFADDR_RLOCK();
2218 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2219 if (ifa->ifa_addr->sa_family != AF_INET6)
2220 continue;
2221 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2222 continue; /* XXX: is there any case to allow anycast? */
2223 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2224 continue; /* don't use this interface */
2225 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2226 continue;
2227 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2228 if (V_ip6_use_deprecated)
2229 dep[1] = (struct in6_ifaddr *)ifa;
2230 continue;
2231 }
2232
2233 if (ifa != NULL)
2234 ifa_ref(ifa);
2235 IN6_IFADDR_RUNLOCK();
2236 return (struct in6_ifaddr *)ifa;
2237 }
2238
2239 /* use the last-resort values, that are, deprecated addresses */
2240 if (dep[0]) {
2241 ifa_ref((struct ifaddr *)dep[0]);
2242 IN6_IFADDR_RUNLOCK();
2243 return dep[0];
2244 }
2245 if (dep[1]) {
2246 ifa_ref((struct ifaddr *)dep[1]);
2247 IN6_IFADDR_RUNLOCK();
2248 return dep[1];
2249 }
2250
2251 IN6_IFADDR_RUNLOCK();
2252 return NULL;
2253 }
2254
2255 /*
2256 * perform DAD when interface becomes IFF_UP.
2257 */
2258 void
2259 in6_if_up(struct ifnet *ifp)
2260 {
2261 struct ifaddr *ifa;
2262 struct in6_ifaddr *ia;
2263
2264 IF_ADDR_LOCK(ifp);
2265 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2266 if (ifa->ifa_addr->sa_family != AF_INET6)
2267 continue;
2268 ia = (struct in6_ifaddr *)ifa;
2269 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2270 /*
2271 * The TENTATIVE flag was likely set by hand
2272 * beforehand, implicitly indicating the need for DAD.
2273 * We may be able to skip the random delay in this
2274 * case, but we impose delays just in case.
2275 */
2276 nd6_dad_start(ifa,
2277 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2278 }
2279 }
2280 IF_ADDR_UNLOCK(ifp);
2281
2282 /*
2283 * special cases, like 6to4, are handled in in6_ifattach
2284 */
2285 in6_ifattach(ifp, NULL);
2286 }
2287
2288 int
2289 in6if_do_dad(struct ifnet *ifp)
2290 {
2291 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2292 return (0);
2293
2294 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2295 return (0);
2296
2297 switch (ifp->if_type) {
2298 #ifdef IFT_DUMMY
2299 case IFT_DUMMY:
2300 #endif
2301 case IFT_FAITH:
2302 /*
2303 * These interfaces do not have the IFF_LOOPBACK flag,
2304 * but loop packets back. We do not have to do DAD on such
2305 * interfaces. We should even omit it, because loop-backed
2306 * NS would confuse the DAD procedure.
2307 */
2308 return (0);
2309 default:
2310 /*
2311 * Our DAD routine requires the interface up and running.
2312 * However, some interfaces can be up before the RUNNING
2313 * status. Additionaly, users may try to assign addresses
2314 * before the interface becomes up (or running).
2315 * We simply skip DAD in such a case as a work around.
2316 * XXX: we should rather mark "tentative" on such addresses,
2317 * and do DAD after the interface becomes ready.
2318 */
2319 if (!((ifp->if_flags & IFF_UP) &&
2320 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2321 return (0);
2322
2323 return (1);
2324 }
2325 }
2326
2327 /*
2328 * Calculate max IPv6 MTU through all the interfaces and store it
2329 * to in6_maxmtu.
2330 */
2331 void
2332 in6_setmaxmtu(void)
2333 {
2334 unsigned long maxmtu = 0;
2335 struct ifnet *ifp;
2336
2337 IFNET_RLOCK_NOSLEEP();
2338 for (ifp = TAILQ_FIRST(&V_ifnet); ifp;
2339 ifp = TAILQ_NEXT(ifp, if_list)) {
2340 /* this function can be called during ifnet initialization */
2341 if (!ifp->if_afdata[AF_INET6])
2342 continue;
2343 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2344 IN6_LINKMTU(ifp) > maxmtu)
2345 maxmtu = IN6_LINKMTU(ifp);
2346 }
2347 IFNET_RUNLOCK_NOSLEEP();
2348 if (maxmtu) /* update only when maxmtu is positive */
2349 V_in6_maxmtu = maxmtu;
2350 }
2351
2352 /*
2353 * Provide the length of interface identifiers to be used for the link attached
2354 * to the given interface. The length should be defined in "IPv6 over
2355 * xxx-link" document. Note that address architecture might also define
2356 * the length for a particular set of address prefixes, regardless of the
2357 * link type. As clarified in rfc2462bis, those two definitions should be
2358 * consistent, and those really are as of August 2004.
2359 */
2360 int
2361 in6_if2idlen(struct ifnet *ifp)
2362 {
2363 switch (ifp->if_type) {
2364 case IFT_ETHER: /* RFC2464 */
2365 #ifdef IFT_PROPVIRTUAL
2366 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2367 #endif
2368 #ifdef IFT_L2VLAN
2369 case IFT_L2VLAN: /* ditto */
2370 #endif
2371 #ifdef IFT_IEEE80211
2372 case IFT_IEEE80211: /* ditto */
2373 #endif
2374 #ifdef IFT_MIP
2375 case IFT_MIP: /* ditto */
2376 #endif
2377 case IFT_INFINIBAND:
2378 return (64);
2379 case IFT_FDDI: /* RFC2467 */
2380 return (64);
2381 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2382 return (64);
2383 case IFT_PPP: /* RFC2472 */
2384 return (64);
2385 case IFT_ARCNET: /* RFC2497 */
2386 return (64);
2387 case IFT_FRELAY: /* RFC2590 */
2388 return (64);
2389 case IFT_IEEE1394: /* RFC3146 */
2390 return (64);
2391 case IFT_GIF:
2392 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2393 case IFT_LOOP:
2394 return (64); /* XXX: is this really correct? */
2395 default:
2396 /*
2397 * Unknown link type:
2398 * It might be controversial to use the today's common constant
2399 * of 64 for these cases unconditionally. For full compliance,
2400 * we should return an error in this case. On the other hand,
2401 * if we simply miss the standard for the link type or a new
2402 * standard is defined for a new link type, the IFID length
2403 * is very likely to be the common constant. As a compromise,
2404 * we always use the constant, but make an explicit notice
2405 * indicating the "unknown" case.
2406 */
2407 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2408 return (64);
2409 }
2410 }
2411
2412 #include <sys/sysctl.h>
2413
2414 struct in6_llentry {
2415 struct llentry base;
2416 struct sockaddr_in6 l3_addr6;
2417 };
2418
2419 static struct llentry *
2420 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2421 {
2422 struct in6_llentry *lle;
2423
2424 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE,
2425 M_DONTWAIT | M_ZERO);
2426 if (lle == NULL) /* NB: caller generates msg */
2427 return NULL;
2428
2429 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2430 lle->base.lle_refcnt = 1;
2431 LLE_LOCK_INIT(&lle->base);
2432 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2433 CALLOUT_RETURNUNLOCKED);
2434
2435 return &lle->base;
2436 }
2437
2438 /*
2439 * Deletes an address from the address table.
2440 * This function is called by the timer functions
2441 * such as arptimer() and nd6_llinfo_timer(), and
2442 * the caller does the locking.
2443 */
2444 static void
2445 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2446 {
2447 LLE_WUNLOCK(lle);
2448 LLE_LOCK_DESTROY(lle);
2449 free(lle, M_LLTABLE);
2450 }
2451
2452 static void
2453 in6_lltable_prefix_free(struct lltable *llt,
2454 const struct sockaddr *prefix,
2455 const struct sockaddr *mask,
2456 u_int flags)
2457 {
2458 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2459 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2460 struct llentry *lle, *next;
2461 register int i;
2462
2463 /*
2464 * (flags & LLE_STATIC) means deleting all entries
2465 * including static ND6 entries
2466 */
2467 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
2468 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2469 if (IN6_ARE_MASKED_ADDR_EQUAL(
2470 &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr,
2471 &pfx->sin6_addr,
2472 &msk->sin6_addr) &&
2473 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
2474 int canceled;
2475
2476 canceled = callout_drain(&lle->la_timer);
2477 LLE_WLOCK(lle);
2478 if (canceled)
2479 LLE_REMREF(lle);
2480 llentry_free(lle);
2481 }
2482 }
2483 }
2484 }
2485
2486 static int
2487 in6_lltable_rtcheck(struct ifnet *ifp,
2488 u_int flags,
2489 const struct sockaddr *l3addr)
2490 {
2491 struct rtentry *rt;
2492 char ip6buf[INET6_ADDRSTRLEN];
2493
2494 KASSERT(l3addr->sa_family == AF_INET6,
2495 ("sin_family %d", l3addr->sa_family));
2496
2497 /* XXX rtalloc1 should take a const param */
2498 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
2499 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2500 struct ifaddr *ifa;
2501 /*
2502 * Create an ND6 cache for an IPv6 neighbor
2503 * that is not covered by our own prefix.
2504 */
2505 /* XXX ifaof_ifpforaddr should take a const param */
2506 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2507 if (ifa != NULL) {
2508 ifa_free(ifa);
2509 if (rt != NULL)
2510 RTFREE_LOCKED(rt);
2511 return 0;
2512 }
2513 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2514 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2515 if (rt != NULL)
2516 RTFREE_LOCKED(rt);
2517 return EINVAL;
2518 }
2519 RTFREE_LOCKED(rt);
2520 return 0;
2521 }
2522
2523 static struct llentry *
2524 in6_lltable_lookup(struct lltable *llt, u_int flags,
2525 const struct sockaddr *l3addr)
2526 {
2527 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2528 struct ifnet *ifp = llt->llt_ifp;
2529 struct llentry *lle;
2530 struct llentries *lleh;
2531 u_int hashkey;
2532
2533 IF_AFDATA_LOCK_ASSERT(ifp);
2534 KASSERT(l3addr->sa_family == AF_INET6,
2535 ("sin_family %d", l3addr->sa_family));
2536
2537 hashkey = sin6->sin6_addr.s6_addr32[3];
2538 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2539 LIST_FOREACH(lle, lleh, lle_next) {
2540 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2541 if (lle->la_flags & LLE_DELETED)
2542 continue;
2543 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2544 sizeof(struct in6_addr)) == 0)
2545 break;
2546 }
2547
2548 if (lle == NULL) {
2549 if (!(flags & LLE_CREATE))
2550 return (NULL);
2551 /*
2552 * A route that covers the given address must have
2553 * been installed 1st because we are doing a resolution,
2554 * verify this.
2555 */
2556 if (!(flags & LLE_IFADDR) &&
2557 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2558 return NULL;
2559
2560 lle = in6_lltable_new(l3addr, flags);
2561 if (lle == NULL) {
2562 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2563 return NULL;
2564 }
2565 lle->la_flags = flags & ~LLE_CREATE;
2566 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2567 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2568 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2569 }
2570
2571 lle->lle_tbl = llt;
2572 lle->lle_head = lleh;
2573 LIST_INSERT_HEAD(lleh, lle, lle_next);
2574 } else if (flags & LLE_DELETE) {
2575 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2576 LLE_WLOCK(lle);
2577 lle->la_flags = LLE_DELETED;
2578 LLE_WUNLOCK(lle);
2579 #ifdef DIAGNOSTIC
2580 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2581 #endif
2582 }
2583 lle = (void *)-1;
2584 }
2585 if (LLE_IS_VALID(lle)) {
2586 if (flags & LLE_EXCLUSIVE)
2587 LLE_WLOCK(lle);
2588 else
2589 LLE_RLOCK(lle);
2590 }
2591 return (lle);
2592 }
2593
2594 static int
2595 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2596 {
2597 struct ifnet *ifp = llt->llt_ifp;
2598 struct llentry *lle;
2599 /* XXX stack use */
2600 struct {
2601 struct rt_msghdr rtm;
2602 struct sockaddr_in6 sin6;
2603 /*
2604 * ndp.c assumes that sdl is word aligned
2605 */
2606 #ifdef __LP64__
2607 uint32_t pad;
2608 #endif
2609 struct sockaddr_dl sdl;
2610 } ndpc;
2611 int i, error;
2612
2613 if (ifp->if_flags & IFF_LOOPBACK)
2614 return 0;
2615
2616 LLTABLE_LOCK_ASSERT();
2617
2618 error = 0;
2619 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2620 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2621 struct sockaddr_dl *sdl;
2622
2623 /* skip deleted or invalid entries */
2624 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2625 continue;
2626 /* Skip if jailed and not a valid IP of the prison. */
2627 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2628 continue;
2629 /*
2630 * produce a msg made of:
2631 * struct rt_msghdr;
2632 * struct sockaddr_in6 (IPv6)
2633 * struct sockaddr_dl;
2634 */
2635 bzero(&ndpc, sizeof(ndpc));
2636 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2637 ndpc.rtm.rtm_version = RTM_VERSION;
2638 ndpc.rtm.rtm_type = RTM_GET;
2639 ndpc.rtm.rtm_flags = RTF_UP;
2640 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2641 ndpc.sin6.sin6_family = AF_INET6;
2642 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2643 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2644
2645 /* publish */
2646 if (lle->la_flags & LLE_PUB)
2647 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2648
2649 sdl = &ndpc.sdl;
2650 sdl->sdl_family = AF_LINK;
2651 sdl->sdl_len = sizeof(*sdl);
2652 sdl->sdl_alen = ifp->if_addrlen;
2653 sdl->sdl_index = ifp->if_index;
2654 sdl->sdl_type = ifp->if_type;
2655 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2656 ndpc.rtm.rtm_rmx.rmx_expire =
2657 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2658 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2659 if (lle->la_flags & LLE_STATIC)
2660 ndpc.rtm.rtm_flags |= RTF_STATIC;
2661 ndpc.rtm.rtm_index = ifp->if_index;
2662 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2663 if (error)
2664 break;
2665 }
2666 }
2667 return error;
2668 }
2669
2670 void *
2671 in6_domifattach(struct ifnet *ifp)
2672 {
2673 struct in6_ifextra *ext;
2674
2675 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2676 bzero(ext, sizeof(*ext));
2677
2678 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2679 M_IFADDR, M_WAITOK);
2680 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2681
2682 ext->icmp6_ifstat =
2683 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2684 M_IFADDR, M_WAITOK);
2685 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2686
2687 ext->nd_ifinfo = nd6_ifattach(ifp);
2688 ext->scope6_id = scope6_ifattach(ifp);
2689 ext->lltable = lltable_init(ifp, AF_INET6);
2690 if (ext->lltable != NULL) {
2691 ext->lltable->llt_free = in6_lltable_free;
2692 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2693 ext->lltable->llt_lookup = in6_lltable_lookup;
2694 ext->lltable->llt_dump = in6_lltable_dump;
2695 }
2696
2697 ext->mld_ifinfo = mld_domifattach(ifp);
2698
2699 return ext;
2700 }
2701
2702 void
2703 in6_domifdetach(struct ifnet *ifp, void *aux)
2704 {
2705 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2706
2707 mld_domifdetach(ifp);
2708 scope6_ifdetach(ext->scope6_id);
2709 nd6_ifdetach(ext->nd_ifinfo);
2710 lltable_free(ext->lltable);
2711 free(ext->in6_ifstat, M_IFADDR);
2712 free(ext->icmp6_ifstat, M_IFADDR);
2713 free(ext, M_IFADDR);
2714 }
2715
2716 /*
2717 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2718 * v4 mapped addr or v4 compat addr
2719 */
2720 void
2721 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2722 {
2723
2724 bzero(sin, sizeof(*sin));
2725 sin->sin_len = sizeof(struct sockaddr_in);
2726 sin->sin_family = AF_INET;
2727 sin->sin_port = sin6->sin6_port;
2728 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2729 }
2730
2731 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2732 void
2733 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2734 {
2735 bzero(sin6, sizeof(*sin6));
2736 sin6->sin6_len = sizeof(struct sockaddr_in6);
2737 sin6->sin6_family = AF_INET6;
2738 sin6->sin6_port = sin->sin_port;
2739 sin6->sin6_addr.s6_addr32[0] = 0;
2740 sin6->sin6_addr.s6_addr32[1] = 0;
2741 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2742 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2743 }
2744
2745 /* Convert sockaddr_in6 into sockaddr_in. */
2746 void
2747 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2748 {
2749 struct sockaddr_in *sin_p;
2750 struct sockaddr_in6 sin6;
2751
2752 /*
2753 * Save original sockaddr_in6 addr and convert it
2754 * to sockaddr_in.
2755 */
2756 sin6 = *(struct sockaddr_in6 *)nam;
2757 sin_p = (struct sockaddr_in *)nam;
2758 in6_sin6_2_sin(sin_p, &sin6);
2759 }
2760
2761 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2762 void
2763 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2764 {
2765 struct sockaddr_in *sin_p;
2766 struct sockaddr_in6 *sin6_p;
2767
2768 sin6_p = malloc(sizeof *sin6_p, M_SONAME,
2769 M_WAITOK);
2770 sin_p = (struct sockaddr_in *)*nam;
2771 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2772 free(*nam, M_SONAME);
2773 *nam = (struct sockaddr *)sin6_p;
2774 }
Cache object: df278098d16398faeb791dd937be079e
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