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/10.3/sys/netinet6/in6.c 294503 2016-01-21 14:11:01Z 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 #include <netinet/ip_carp.h>
99
100 #include <netinet/ip6.h>
101 #include <netinet6/ip6_var.h>
102 #include <netinet6/nd6.h>
103 #include <netinet6/mld6_var.h>
104 #include <netinet6/ip6_mroute.h>
105 #include <netinet6/in6_ifattach.h>
106 #include <netinet6/scope6_var.h>
107 #include <netinet6/in6_pcb.h>
108
109 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
110 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
111
112 /*
113 * Definitions of some costant IP6 addresses.
114 */
115 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
116 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
117 const struct in6_addr in6addr_nodelocal_allnodes =
118 IN6ADDR_NODELOCAL_ALLNODES_INIT;
119 const struct in6_addr in6addr_linklocal_allnodes =
120 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
121 const struct in6_addr in6addr_linklocal_allrouters =
122 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
123 const struct in6_addr in6addr_linklocal_allv2routers =
124 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
125
126 const struct in6_addr in6mask0 = IN6MASK0;
127 const struct in6_addr in6mask32 = IN6MASK32;
128 const struct in6_addr in6mask64 = IN6MASK64;
129 const struct in6_addr in6mask96 = IN6MASK96;
130 const struct in6_addr in6mask128 = IN6MASK128;
131
132 const struct sockaddr_in6 sa6_any =
133 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
134
135 static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t,
136 struct ifnet *, struct thread *);
137 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
138 struct sockaddr_in6 *, int);
139 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
140
141 int (*faithprefix_p)(struct in6_addr *);
142
143 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
144 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
145
146 void
147 in6_ifaddloop(struct ifaddr *ifa)
148 {
149 struct sockaddr_dl gateway;
150 struct sockaddr_in6 mask, addr;
151 struct rtentry rt;
152 struct in6_ifaddr *ia;
153 struct ifnet *ifp;
154 struct llentry *ln;
155
156 ia = ifa2ia6(ifa);
157 ifp = ifa->ifa_ifp;
158 /*
159 * initialize for rtmsg generation
160 */
161 bzero(&gateway, sizeof(gateway));
162 gateway.sdl_len = sizeof(gateway);
163 gateway.sdl_family = AF_LINK;
164 if (nd6_need_cache(ifp) != 0) {
165 IF_AFDATA_LOCK(ifp);
166 ifa->ifa_rtrequest = nd6_rtrequest;
167 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
168 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
169 IF_AFDATA_UNLOCK(ifp);
170 if (ln != NULL) {
171 ln->la_expire = 0; /* for IPv6 this means permanent */
172 ln->ln_state = ND6_LLINFO_REACHABLE;
173
174 gateway.sdl_alen = 6;
175 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
176 sizeof(ln->ll_addr));
177 LLE_WUNLOCK(ln);
178 }
179 }
180 bzero(&rt, sizeof(rt));
181 rt.rt_gateway = (struct sockaddr *)&gateway;
182 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
183 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
184 rt_mask(&rt) = (struct sockaddr *)&mask;
185 rt_key(&rt) = (struct sockaddr *)&addr;
186 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
187 /* Announce arrival of local address to all FIBs. */
188 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
189 }
190
191 void
192 in6_ifremloop(struct ifaddr *ifa)
193 {
194 struct sockaddr_dl gateway;
195 struct sockaddr_in6 mask, addr;
196 struct rtentry rt0;
197 struct in6_ifaddr *ia;
198 struct ifnet *ifp;
199
200 ia = ifa2ia6(ifa);
201 ifp = ifa->ifa_ifp;
202 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
203 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
204 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
205 (struct sockaddr *)&mask, LLE_STATIC);
206
207 /*
208 * initialize for rtmsg generation
209 */
210 bzero(&gateway, sizeof(gateway));
211 gateway.sdl_len = sizeof(gateway);
212 gateway.sdl_family = AF_LINK;
213 gateway.sdl_nlen = 0;
214 gateway.sdl_alen = ifp->if_addrlen;
215 bzero(&rt0, sizeof(rt0));
216 rt0.rt_gateway = (struct sockaddr *)&gateway;
217 rt_mask(&rt0) = (struct sockaddr *)&mask;
218 rt_key(&rt0) = (struct sockaddr *)&addr;
219 rt0.rt_flags = RTF_HOST | RTF_STATIC;
220 /* Announce removal of local address to all FIBs. */
221 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
222 }
223
224 int
225 in6_mask2len(struct in6_addr *mask, u_char *lim0)
226 {
227 int x = 0, y;
228 u_char *lim = lim0, *p;
229
230 /* ignore the scope_id part */
231 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
232 lim = (u_char *)mask + sizeof(*mask);
233 for (p = (u_char *)mask; p < lim; x++, p++) {
234 if (*p != 0xff)
235 break;
236 }
237 y = 0;
238 if (p < lim) {
239 for (y = 0; y < 8; y++) {
240 if ((*p & (0x80 >> y)) == 0)
241 break;
242 }
243 }
244
245 /*
246 * when the limit pointer is given, do a stricter check on the
247 * remaining bits.
248 */
249 if (p < lim) {
250 if (y != 0 && (*p & (0x00ff >> y)) != 0)
251 return (-1);
252 for (p = p + 1; p < lim; p++)
253 if (*p != 0)
254 return (-1);
255 }
256
257 return x * 8 + y;
258 }
259
260 #ifdef COMPAT_FREEBSD32
261 struct in6_ndifreq32 {
262 char ifname[IFNAMSIZ];
263 uint32_t ifindex;
264 };
265 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
266 #endif
267
268 int
269 in6_control(struct socket *so, u_long cmd, caddr_t data,
270 struct ifnet *ifp, struct thread *td)
271 {
272 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
273 struct in6_ifaddr *ia = NULL;
274 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
275 struct sockaddr_in6 *sa6;
276 int carp_attached = 0;
277 int error;
278 u_long ocmd = cmd;
279
280 /*
281 * Compat to make pre-10.x ifconfig(8) operable.
282 */
283 if (cmd == OSIOCAIFADDR_IN6)
284 cmd = SIOCAIFADDR_IN6;
285
286 switch (cmd) {
287 case SIOCGETSGCNT_IN6:
288 case SIOCGETMIFCNT_IN6:
289 /*
290 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
291 * We cannot see how that would be needed, so do not adjust the
292 * KPI blindly; more likely should clean up the IPv4 variant.
293 */
294 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
295 }
296
297 switch (cmd) {
298 case SIOCAADDRCTL_POLICY:
299 case SIOCDADDRCTL_POLICY:
300 if (td != NULL) {
301 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
302 if (error)
303 return (error);
304 }
305 return (in6_src_ioctl(cmd, data));
306 }
307
308 if (ifp == NULL)
309 return (EOPNOTSUPP);
310
311 switch (cmd) {
312 case SIOCSNDFLUSH_IN6:
313 case SIOCSPFXFLUSH_IN6:
314 case SIOCSRTRFLUSH_IN6:
315 case SIOCSDEFIFACE_IN6:
316 case SIOCSIFINFO_FLAGS:
317 case SIOCSIFINFO_IN6:
318 if (td != NULL) {
319 error = priv_check(td, PRIV_NETINET_ND6);
320 if (error)
321 return (error);
322 }
323 /* FALLTHROUGH */
324 case OSIOCGIFINFO_IN6:
325 case SIOCGIFINFO_IN6:
326 case SIOCGNBRINFO_IN6:
327 case SIOCGDEFIFACE_IN6:
328 return (nd6_ioctl(cmd, data, ifp));
329
330 #ifdef COMPAT_FREEBSD32
331 case SIOCGDEFIFACE32_IN6:
332 {
333 struct in6_ndifreq ndif;
334 struct in6_ndifreq32 *ndif32;
335
336 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
337 ifp);
338 if (error)
339 return (error);
340 ndif32 = (struct in6_ndifreq32 *)data;
341 ndif32->ifindex = ndif.ifindex;
342 return (0);
343 }
344 #endif
345 }
346
347 switch (cmd) {
348 case SIOCSIFPREFIX_IN6:
349 case SIOCDIFPREFIX_IN6:
350 case SIOCAIFPREFIX_IN6:
351 case SIOCCIFPREFIX_IN6:
352 case SIOCSGIFPREFIX_IN6:
353 case SIOCGIFPREFIX_IN6:
354 log(LOG_NOTICE,
355 "prefix ioctls are now invalidated. "
356 "please use ifconfig.\n");
357 return (EOPNOTSUPP);
358 }
359
360 switch (cmd) {
361 case SIOCSSCOPE6:
362 if (td != NULL) {
363 error = priv_check(td, PRIV_NETINET_SCOPE6);
364 if (error)
365 return (error);
366 }
367 /* FALLTHROUGH */
368 case SIOCGSCOPE6:
369 case SIOCGSCOPE6DEF:
370 return (scope6_ioctl(cmd, data, ifp));
371 }
372
373 switch (cmd) {
374 case SIOCALIFADDR:
375 if (td != NULL) {
376 error = priv_check(td, PRIV_NET_ADDIFADDR);
377 if (error)
378 return (error);
379 }
380 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
381
382 case SIOCDLIFADDR:
383 if (td != NULL) {
384 error = priv_check(td, PRIV_NET_DELIFADDR);
385 if (error)
386 return (error);
387 }
388 /* FALLTHROUGH */
389 case SIOCGLIFADDR:
390 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
391 }
392
393 /*
394 * Find address for this interface, if it exists.
395 *
396 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
397 * only, and used the first interface address as the target of other
398 * operations (without checking ifra_addr). This was because netinet
399 * code/API assumed at most 1 interface address per interface.
400 * Since IPv6 allows a node to assign multiple addresses
401 * on a single interface, we almost always look and check the
402 * presence of ifra_addr, and reject invalid ones here.
403 * It also decreases duplicated code among SIOC*_IN6 operations.
404 */
405 switch (cmd) {
406 case SIOCAIFADDR_IN6:
407 case SIOCSIFPHYADDR_IN6:
408 sa6 = &ifra->ifra_addr;
409 break;
410 case SIOCSIFADDR_IN6:
411 case SIOCGIFADDR_IN6:
412 case SIOCSIFDSTADDR_IN6:
413 case SIOCSIFNETMASK_IN6:
414 case SIOCGIFDSTADDR_IN6:
415 case SIOCGIFNETMASK_IN6:
416 case SIOCDIFADDR_IN6:
417 case SIOCGIFPSRCADDR_IN6:
418 case SIOCGIFPDSTADDR_IN6:
419 case SIOCGIFAFLAG_IN6:
420 case SIOCSNDFLUSH_IN6:
421 case SIOCSPFXFLUSH_IN6:
422 case SIOCSRTRFLUSH_IN6:
423 case SIOCGIFALIFETIME_IN6:
424 case SIOCSIFALIFETIME_IN6:
425 case SIOCGIFSTAT_IN6:
426 case SIOCGIFSTAT_ICMP6:
427 sa6 = &ifr->ifr_addr;
428 break;
429 case SIOCSIFADDR:
430 case SIOCSIFBRDADDR:
431 case SIOCSIFDSTADDR:
432 case SIOCSIFNETMASK:
433 /*
434 * Although we should pass any non-INET6 ioctl requests
435 * down to driver, we filter some legacy INET requests.
436 * Drivers trust SIOCSIFADDR et al to come from an already
437 * privileged layer, and do not perform any credentials
438 * checks or input validation.
439 */
440 return (EINVAL);
441 default:
442 sa6 = NULL;
443 break;
444 }
445 if (sa6 && sa6->sin6_family == AF_INET6) {
446 if (sa6->sin6_scope_id != 0)
447 error = sa6_embedscope(sa6, 0);
448 else
449 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
450 if (error != 0)
451 return (error);
452 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
453 &sa6->sin6_addr)) != 0)
454 return (error);
455 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
456 } else
457 ia = NULL;
458
459 switch (cmd) {
460 case SIOCSIFADDR_IN6:
461 case SIOCSIFDSTADDR_IN6:
462 case SIOCSIFNETMASK_IN6:
463 /*
464 * Since IPv6 allows a node to assign multiple addresses
465 * on a single interface, SIOCSIFxxx ioctls are deprecated.
466 */
467 /* we decided to obsolete this command (20000704) */
468 error = EINVAL;
469 goto out;
470
471 case SIOCDIFADDR_IN6:
472 /*
473 * for IPv4, we look for existing in_ifaddr here to allow
474 * "ifconfig if0 delete" to remove the first IPv4 address on
475 * the interface. For IPv6, as the spec allows multiple
476 * interface address from the day one, we consider "remove the
477 * first one" semantics to be not preferable.
478 */
479 if (ia == NULL) {
480 error = EADDRNOTAVAIL;
481 goto out;
482 }
483 /* FALLTHROUGH */
484 case SIOCAIFADDR_IN6:
485 /*
486 * We always require users to specify a valid IPv6 address for
487 * the corresponding operation.
488 */
489 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
490 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
491 error = EAFNOSUPPORT;
492 goto out;
493 }
494
495 if (td != NULL) {
496 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
497 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
498 if (error)
499 goto out;
500 }
501 /* FALLTHROUGH */
502 case SIOCGIFSTAT_IN6:
503 case SIOCGIFSTAT_ICMP6:
504 if (ifp->if_afdata[AF_INET6] == NULL) {
505 error = EPFNOSUPPORT;
506 goto out;
507 }
508 break;
509
510 case SIOCGIFADDR_IN6:
511 /* This interface is basically deprecated. use SIOCGIFCONF. */
512 /* FALLTHROUGH */
513 case SIOCGIFAFLAG_IN6:
514 case SIOCGIFNETMASK_IN6:
515 case SIOCGIFDSTADDR_IN6:
516 case SIOCGIFALIFETIME_IN6:
517 /* must think again about its semantics */
518 if (ia == NULL) {
519 error = EADDRNOTAVAIL;
520 goto out;
521 }
522 break;
523
524 case SIOCSIFALIFETIME_IN6:
525 {
526 struct in6_addrlifetime *lt;
527
528 if (td != NULL) {
529 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
530 if (error)
531 goto out;
532 }
533 if (ia == NULL) {
534 error = EADDRNOTAVAIL;
535 goto out;
536 }
537 /* sanity for overflow - beware unsigned */
538 lt = &ifr->ifr_ifru.ifru_lifetime;
539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
540 lt->ia6t_vltime + time_uptime < time_uptime) {
541 error = EINVAL;
542 goto out;
543 }
544 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
545 lt->ia6t_pltime + time_uptime < time_uptime) {
546 error = EINVAL;
547 goto out;
548 }
549 break;
550 }
551 }
552
553 switch (cmd) {
554 case SIOCGIFADDR_IN6:
555 ifr->ifr_addr = ia->ia_addr;
556 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
557 goto out;
558 break;
559
560 case SIOCGIFDSTADDR_IN6:
561 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
562 error = EINVAL;
563 goto out;
564 }
565 /*
566 * XXX: should we check if ifa_dstaddr is NULL and return
567 * an error?
568 */
569 ifr->ifr_dstaddr = ia->ia_dstaddr;
570 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
571 goto out;
572 break;
573
574 case SIOCGIFNETMASK_IN6:
575 ifr->ifr_addr = ia->ia_prefixmask;
576 break;
577
578 case SIOCGIFAFLAG_IN6:
579 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
580 break;
581
582 case SIOCGIFSTAT_IN6:
583 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
584 ifp->if_afdata[AF_INET6])->in6_ifstat,
585 &ifr->ifr_ifru.ifru_stat,
586 sizeof(struct in6_ifstat) / sizeof(uint64_t));
587 break;
588
589 case SIOCGIFSTAT_ICMP6:
590 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
591 ifp->if_afdata[AF_INET6])->icmp6_ifstat,
592 &ifr->ifr_ifru.ifru_icmp6stat,
593 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
594 break;
595
596 case SIOCGIFALIFETIME_IN6:
597 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
598 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
599 time_t maxexpire;
600 struct in6_addrlifetime *retlt =
601 &ifr->ifr_ifru.ifru_lifetime;
602
603 /*
604 * XXX: adjust expiration time assuming time_t is
605 * signed.
606 */
607 maxexpire = (-1) &
608 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
609 if (ia->ia6_lifetime.ia6t_vltime <
610 maxexpire - ia->ia6_updatetime) {
611 retlt->ia6t_expire = ia->ia6_updatetime +
612 ia->ia6_lifetime.ia6t_vltime;
613 } else
614 retlt->ia6t_expire = maxexpire;
615 }
616 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
617 time_t maxexpire;
618 struct in6_addrlifetime *retlt =
619 &ifr->ifr_ifru.ifru_lifetime;
620
621 /*
622 * XXX: adjust expiration time assuming time_t is
623 * signed.
624 */
625 maxexpire = (-1) &
626 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
627 if (ia->ia6_lifetime.ia6t_pltime <
628 maxexpire - ia->ia6_updatetime) {
629 retlt->ia6t_preferred = ia->ia6_updatetime +
630 ia->ia6_lifetime.ia6t_pltime;
631 } else
632 retlt->ia6t_preferred = maxexpire;
633 }
634 break;
635
636 case SIOCSIFALIFETIME_IN6:
637 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
638 /* for sanity */
639 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
640 ia->ia6_lifetime.ia6t_expire =
641 time_uptime + ia->ia6_lifetime.ia6t_vltime;
642 } else
643 ia->ia6_lifetime.ia6t_expire = 0;
644 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
645 ia->ia6_lifetime.ia6t_preferred =
646 time_uptime + ia->ia6_lifetime.ia6t_pltime;
647 } else
648 ia->ia6_lifetime.ia6t_preferred = 0;
649 break;
650
651 case SIOCAIFADDR_IN6:
652 {
653 int i;
654 struct nd_prefixctl pr0;
655 struct nd_prefix *pr;
656
657 /*
658 * first, make or update the interface address structure,
659 * and link it to the list.
660 */
661 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
662 goto out;
663 if (ia != NULL)
664 ifa_free(&ia->ia_ifa);
665 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
666 == NULL) {
667 /*
668 * this can happen when the user specify the 0 valid
669 * lifetime.
670 */
671 break;
672 }
673
674 if (cmd == ocmd && ifra->ifra_vhid > 0) {
675 if (carp_attach_p != NULL)
676 error = (*carp_attach_p)(&ia->ia_ifa,
677 ifra->ifra_vhid);
678 else
679 error = EPROTONOSUPPORT;
680 if (error)
681 goto out;
682 else
683 carp_attached = 1;
684 }
685
686 /*
687 * then, make the prefix on-link on the interface.
688 * XXX: we'd rather create the prefix before the address, but
689 * we need at least one address to install the corresponding
690 * interface route, so we configure the address first.
691 */
692
693 /*
694 * convert mask to prefix length (prefixmask has already
695 * been validated in in6_update_ifa().
696 */
697 bzero(&pr0, sizeof(pr0));
698 pr0.ndpr_ifp = ifp;
699 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
700 NULL);
701 if (pr0.ndpr_plen == 128) {
702 /* we don't need to install a host route. */
703 goto aifaddr_out;
704 }
705 pr0.ndpr_prefix = ifra->ifra_addr;
706 /* apply the mask for safety. */
707 for (i = 0; i < 4; i++) {
708 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
709 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
710 }
711 /*
712 * XXX: since we don't have an API to set prefix (not address)
713 * lifetimes, we just use the same lifetimes as addresses.
714 * The (temporarily) installed lifetimes can be overridden by
715 * later advertised RAs (when accept_rtadv is non 0), which is
716 * an intended behavior.
717 */
718 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
719 pr0.ndpr_raf_auto =
720 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
721 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
722 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
723
724 /* add the prefix if not yet. */
725 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
726 /*
727 * nd6_prelist_add will install the corresponding
728 * interface route.
729 */
730 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
731 if (carp_attached)
732 (*carp_detach_p)(&ia->ia_ifa);
733 goto out;
734 }
735 if (pr == NULL) {
736 if (carp_attached)
737 (*carp_detach_p)(&ia->ia_ifa);
738 log(LOG_ERR, "nd6_prelist_add succeeded but "
739 "no prefix\n");
740 error = EINVAL;
741 goto out;
742 }
743 }
744
745 /* relate the address to the prefix */
746 if (ia->ia6_ndpr == NULL) {
747 ia->ia6_ndpr = pr;
748 pr->ndpr_refcnt++;
749
750 /*
751 * If this is the first autoconf address from the
752 * prefix, create a temporary address as well
753 * (when required).
754 */
755 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
756 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
757 int e;
758 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
759 log(LOG_NOTICE, "in6_control: failed "
760 "to create a temporary address, "
761 "errno=%d\n", e);
762 }
763 }
764 }
765
766 /*
767 * this might affect the status of autoconfigured addresses,
768 * that is, this address might make other addresses detached.
769 */
770 pfxlist_onlink_check();
771 aifaddr_out:
772 if (error != 0 || ia == NULL)
773 break;
774 /*
775 * Try to clear the flag when a new IPv6 address is added
776 * onto an IFDISABLED interface and it succeeds.
777 */
778 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
779 struct in6_ndireq nd;
780
781 memset(&nd, 0, sizeof(nd));
782 nd.ndi.flags = ND_IFINFO(ifp)->flags;
783 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
784 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
785 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
786 "SIOCSIFINFO_FLAGS for -ifdisabled "
787 "failed.");
788 /*
789 * Ignore failure of clearing the flag intentionally.
790 * The failure means address duplication was detected.
791 */
792 }
793 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
794 break;
795 }
796
797 case SIOCDIFADDR_IN6:
798 {
799 struct nd_prefix *pr;
800
801 /*
802 * If the address being deleted is the only one that owns
803 * the corresponding prefix, expire the prefix as well.
804 * XXX: theoretically, we don't have to worry about such
805 * relationship, since we separate the address management
806 * and the prefix management. We do this, however, to provide
807 * as much backward compatibility as possible in terms of
808 * the ioctl operation.
809 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
810 */
811 pr = ia->ia6_ndpr;
812 in6_purgeaddr(&ia->ia_ifa);
813 if (pr && pr->ndpr_refcnt == 0)
814 prelist_remove(pr);
815 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
816 break;
817 }
818
819 default:
820 if (ifp->if_ioctl == NULL) {
821 error = EOPNOTSUPP;
822 goto out;
823 }
824 error = (*ifp->if_ioctl)(ifp, cmd, data);
825 goto out;
826 }
827
828 error = 0;
829 out:
830 if (ia != NULL)
831 ifa_free(&ia->ia_ifa);
832 return (error);
833 }
834
835
836 /*
837 * Join necessary multicast groups. Factored out from in6_update_ifa().
838 * This entire work should only be done once, for the default FIB.
839 */
840 static int
841 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
842 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
843 {
844 char ip6buf[INET6_ADDRSTRLEN];
845 struct sockaddr_in6 mltaddr, mltmask;
846 struct in6_addr llsol;
847 struct in6_multi_mship *imm;
848 struct rtentry *rt;
849 int delay, error;
850
851 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
852
853 /* Join solicited multicast addr for new host id. */
854 bzero(&llsol, sizeof(struct in6_addr));
855 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
856 llsol.s6_addr32[1] = 0;
857 llsol.s6_addr32[2] = htonl(1);
858 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
859 llsol.s6_addr8[12] = 0xff;
860 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
861 /* XXX: should not happen */
862 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
863 goto cleanup;
864 }
865 delay = 0;
866 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
867 /*
868 * We need a random delay for DAD on the address being
869 * configured. It also means delaying transmission of the
870 * corresponding MLD report to avoid report collision.
871 * [RFC 4861, Section 6.3.7]
872 */
873 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
874 }
875 imm = in6_joingroup(ifp, &llsol, &error, delay);
876 if (imm == NULL) {
877 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
878 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
879 if_name(ifp), error));
880 goto cleanup;
881 }
882 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
883 *in6m_sol = imm->i6mm_maddr;
884
885 bzero(&mltmask, sizeof(mltmask));
886 mltmask.sin6_len = sizeof(struct sockaddr_in6);
887 mltmask.sin6_family = AF_INET6;
888 mltmask.sin6_addr = in6mask32;
889 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
890
891 /*
892 * Join link-local all-nodes address.
893 */
894 bzero(&mltaddr, sizeof(mltaddr));
895 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
896 mltaddr.sin6_family = AF_INET6;
897 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
898 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
899 goto cleanup; /* XXX: should not fail */
900
901 /*
902 * XXX: do we really need this automatic routes? We should probably
903 * reconsider this stuff. Most applications actually do not need the
904 * routes, since they usually specify the outgoing interface.
905 */
906 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
907 if (rt != NULL) {
908 /* XXX: only works in !SCOPEDROUTING case. */
909 if (memcmp(&mltaddr.sin6_addr,
910 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
911 MLTMASK_LEN)) {
912 RTFREE_LOCKED(rt);
913 rt = NULL;
914 }
915 }
916 if (rt == NULL) {
917 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
918 (struct sockaddr *)&ia->ia_addr,
919 (struct sockaddr *)&mltmask, RTF_UP,
920 (struct rtentry **)0, RT_DEFAULT_FIB);
921 if (error)
922 goto cleanup;
923 } else
924 RTFREE_LOCKED(rt);
925
926 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
927 if (imm == NULL) {
928 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
929 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
930 &mltaddr.sin6_addr), if_name(ifp), error));
931 goto cleanup;
932 }
933 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
934
935 /*
936 * Join node information group address.
937 */
938 delay = 0;
939 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
940 /*
941 * The spec does not say anything about delay for this group,
942 * but the same logic should apply.
943 */
944 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
945 }
946 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
947 /* XXX jinmei */
948 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
949 if (imm == NULL)
950 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
951 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
952 &mltaddr.sin6_addr), if_name(ifp), error));
953 /* XXX not very fatal, go on... */
954 else
955 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
956 }
957 if (V_icmp6_nodeinfo_oldmcprefix &&
958 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
959 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
960 if (imm == NULL)
961 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
962 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
963 &mltaddr.sin6_addr), if_name(ifp), error));
964 /* XXX not very fatal, go on... */
965 else
966 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
967 }
968
969 /*
970 * Join interface-local all-nodes address.
971 * (ff01::1%ifN, and ff01::%ifN/32)
972 */
973 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
974 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
975 goto cleanup; /* XXX: should not fail */
976 /* XXX: again, do we really need the route? */
977 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
978 if (rt != NULL) {
979 if (memcmp(&mltaddr.sin6_addr,
980 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
981 MLTMASK_LEN)) {
982 RTFREE_LOCKED(rt);
983 rt = NULL;
984 }
985 }
986 if (rt == NULL) {
987 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
988 (struct sockaddr *)&ia->ia_addr,
989 (struct sockaddr *)&mltmask, RTF_UP,
990 (struct rtentry **)0, RT_DEFAULT_FIB);
991 if (error)
992 goto cleanup;
993 } else
994 RTFREE_LOCKED(rt);
995
996 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
997 if (imm == NULL) {
998 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
999 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
1000 &mltaddr.sin6_addr), if_name(ifp), error));
1001 goto cleanup;
1002 }
1003 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1004 #undef MLTMASK_LEN
1005
1006 cleanup:
1007 return (error);
1008 }
1009
1010 /*
1011 * Update parameters of an IPv6 interface address.
1012 * If necessary, a new entry is created and linked into address chains.
1013 * This function is separated from in6_control().
1014 */
1015 int
1016 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1017 struct in6_ifaddr *ia, int flags)
1018 {
1019 int error = 0, hostIsNew = 0, plen = -1;
1020 struct sockaddr_in6 dst6;
1021 struct in6_addrlifetime *lt;
1022 struct in6_multi *in6m_sol;
1023 int delay;
1024 char ip6buf[INET6_ADDRSTRLEN];
1025
1026 /* Validate parameters */
1027 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1028 return (EINVAL);
1029
1030 /*
1031 * The destination address for a p2p link must have a family
1032 * of AF_UNSPEC or AF_INET6.
1033 */
1034 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1035 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1036 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1037 return (EAFNOSUPPORT);
1038 /*
1039 * validate ifra_prefixmask. don't check sin6_family, netmask
1040 * does not carry fields other than sin6_len.
1041 */
1042 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1043 return (EINVAL);
1044 /*
1045 * Because the IPv6 address architecture is classless, we require
1046 * users to specify a (non 0) prefix length (mask) for a new address.
1047 * We also require the prefix (when specified) mask is valid, and thus
1048 * reject a non-consecutive mask.
1049 */
1050 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1051 return (EINVAL);
1052 if (ifra->ifra_prefixmask.sin6_len != 0) {
1053 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1054 (u_char *)&ifra->ifra_prefixmask +
1055 ifra->ifra_prefixmask.sin6_len);
1056 if (plen <= 0)
1057 return (EINVAL);
1058 } else {
1059 /*
1060 * In this case, ia must not be NULL. We just use its prefix
1061 * length.
1062 */
1063 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1064 }
1065 /*
1066 * If the destination address on a p2p interface is specified,
1067 * and the address is a scoped one, validate/set the scope
1068 * zone identifier.
1069 */
1070 dst6 = ifra->ifra_dstaddr;
1071 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1072 (dst6.sin6_family == AF_INET6)) {
1073 struct in6_addr in6_tmp;
1074 u_int32_t zoneid;
1075
1076 in6_tmp = dst6.sin6_addr;
1077 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1078 return (EINVAL); /* XXX: should be impossible */
1079
1080 if (dst6.sin6_scope_id != 0) {
1081 if (dst6.sin6_scope_id != zoneid)
1082 return (EINVAL);
1083 } else /* user omit to specify the ID. */
1084 dst6.sin6_scope_id = zoneid;
1085
1086 /* convert into the internal form */
1087 if (sa6_embedscope(&dst6, 0))
1088 return (EINVAL); /* XXX: should be impossible */
1089 }
1090 /*
1091 * The destination address can be specified only for a p2p or a
1092 * loopback interface. If specified, the corresponding prefix length
1093 * must be 128.
1094 */
1095 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1096 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1097 /* XXX: noisy message */
1098 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1099 "be specified for a p2p or a loopback IF only\n"));
1100 return (EINVAL);
1101 }
1102 if (plen != 128) {
1103 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1104 "be 128 when dstaddr is specified\n"));
1105 return (EINVAL);
1106 }
1107 }
1108 /* lifetime consistency check */
1109 lt = &ifra->ifra_lifetime;
1110 if (lt->ia6t_pltime > lt->ia6t_vltime)
1111 return (EINVAL);
1112 if (lt->ia6t_vltime == 0) {
1113 /*
1114 * the following log might be noisy, but this is a typical
1115 * configuration mistake or a tool's bug.
1116 */
1117 nd6log((LOG_INFO,
1118 "in6_update_ifa: valid lifetime is 0 for %s\n",
1119 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1120
1121 if (ia == NULL)
1122 return (0); /* there's nothing to do */
1123 }
1124
1125 /*
1126 * If this is a new address, allocate a new ifaddr and link it
1127 * into chains.
1128 */
1129 if (ia == NULL) {
1130 hostIsNew = 1;
1131 /*
1132 * When in6_update_ifa() is called in a process of a received
1133 * RA, it is called under an interrupt context. So, we should
1134 * call malloc with M_NOWAIT.
1135 */
1136 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1137 M_NOWAIT);
1138 if (ia == NULL)
1139 return (ENOBUFS);
1140 bzero((caddr_t)ia, sizeof(*ia));
1141 ifa_init(&ia->ia_ifa);
1142 LIST_INIT(&ia->ia6_memberships);
1143 /* Initialize the address and masks, and put time stamp */
1144 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1145 ia->ia_addr.sin6_family = AF_INET6;
1146 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1147 ia->ia6_createtime = time_uptime;
1148 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1149 /*
1150 * XXX: some functions expect that ifa_dstaddr is not
1151 * NULL for p2p interfaces.
1152 */
1153 ia->ia_ifa.ifa_dstaddr =
1154 (struct sockaddr *)&ia->ia_dstaddr;
1155 } else {
1156 ia->ia_ifa.ifa_dstaddr = NULL;
1157 }
1158 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1159 ia->ia_ifp = ifp;
1160 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1161 IF_ADDR_WLOCK(ifp);
1162 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1163 IF_ADDR_WUNLOCK(ifp);
1164
1165 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1166 IN6_IFADDR_WLOCK();
1167 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1168 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr),
1169 ia, ia6_hash);
1170 IN6_IFADDR_WUNLOCK();
1171 }
1172
1173 /* update timestamp */
1174 ia->ia6_updatetime = time_uptime;
1175
1176 /* set prefix mask */
1177 if (ifra->ifra_prefixmask.sin6_len) {
1178 /*
1179 * We prohibit changing the prefix length of an existing
1180 * address, because
1181 * + such an operation should be rare in IPv6, and
1182 * + the operation would confuse prefix management.
1183 */
1184 if (ia->ia_prefixmask.sin6_len &&
1185 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1186 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1187 " existing (%s) address should not be changed\n",
1188 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1189 error = EINVAL;
1190 goto unlink;
1191 }
1192 ia->ia_prefixmask = ifra->ifra_prefixmask;
1193 ia->ia_prefixmask.sin6_family = AF_INET6;
1194 }
1195
1196 /*
1197 * If a new destination address is specified, scrub the old one and
1198 * install the new destination. Note that the interface must be
1199 * p2p or loopback (see the check above.)
1200 */
1201 if (dst6.sin6_family == AF_INET6 &&
1202 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1203 int e;
1204
1205 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1206 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1207 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1208 "a route to the old destination: %s\n",
1209 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1210 /* proceed anyway... */
1211 } else
1212 ia->ia_flags &= ~IFA_ROUTE;
1213 ia->ia_dstaddr = dst6;
1214 }
1215
1216 /*
1217 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1218 * to see if the address is deprecated or invalidated, but initialize
1219 * these members for applications.
1220 */
1221 ia->ia6_lifetime = ifra->ifra_lifetime;
1222 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1223 ia->ia6_lifetime.ia6t_expire =
1224 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1225 } else
1226 ia->ia6_lifetime.ia6t_expire = 0;
1227 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1228 ia->ia6_lifetime.ia6t_preferred =
1229 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1230 } else
1231 ia->ia6_lifetime.ia6t_preferred = 0;
1232
1233 /* reset the interface and routing table appropriately. */
1234 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1235 goto unlink;
1236
1237 /*
1238 * configure address flags.
1239 */
1240 ia->ia6_flags = ifra->ifra_flags;
1241 /*
1242 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1243 * userland, make it deprecated.
1244 */
1245 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1246 ia->ia6_lifetime.ia6t_pltime = 0;
1247 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1248 }
1249 /*
1250 * Make the address tentative before joining multicast addresses,
1251 * so that corresponding MLD responses would not have a tentative
1252 * source address.
1253 */
1254 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1255
1256 /*
1257 * DAD should be performed for an new address or addresses on
1258 * an interface with ND6_IFF_IFDISABLED.
1259 */
1260 if (in6if_do_dad(ifp) &&
1261 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1262 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1263
1264 /*
1265 * We are done if we have simply modified an existing address.
1266 */
1267 if (!hostIsNew)
1268 return (error);
1269
1270 /*
1271 * Beyond this point, we should call in6_purgeaddr upon an error,
1272 * not just go to unlink.
1273 */
1274
1275 /* Join necessary multicast groups. */
1276 in6m_sol = NULL;
1277 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1278 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1279 if (error)
1280 goto cleanup;
1281 }
1282
1283 /* Perform DAD, if the address is TENTATIVE. */
1284 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1285 int mindelay, maxdelay;
1286
1287 delay = 0;
1288 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1289 /*
1290 * We need to impose a delay before sending an NS
1291 * for DAD. Check if we also needed a delay for the
1292 * corresponding MLD message. If we did, the delay
1293 * should be larger than the MLD delay (this could be
1294 * relaxed a bit, but this simple logic is at least
1295 * safe).
1296 * XXX: Break data hiding guidelines and look at
1297 * state for the solicited multicast group.
1298 */
1299 mindelay = 0;
1300 if (in6m_sol != NULL &&
1301 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1302 mindelay = in6m_sol->in6m_timer;
1303 }
1304 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1305 if (maxdelay - mindelay == 0)
1306 delay = 0;
1307 else {
1308 delay =
1309 (arc4random() % (maxdelay - mindelay)) +
1310 mindelay;
1311 }
1312 }
1313 nd6_dad_start((struct ifaddr *)ia, delay);
1314 }
1315
1316 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1317 ifa_free(&ia->ia_ifa);
1318 return (error);
1319
1320 unlink:
1321 /*
1322 * XXX: if a change of an existing address failed, keep the entry
1323 * anyway.
1324 */
1325 if (hostIsNew) {
1326 in6_unlink_ifa(ia, ifp);
1327 ifa_free(&ia->ia_ifa);
1328 }
1329 return (error);
1330
1331 cleanup:
1332 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1333 ifa_free(&ia->ia_ifa);
1334 in6_purgeaddr(&ia->ia_ifa);
1335 return error;
1336 }
1337
1338 /*
1339 * Leave multicast groups. Factored out from in6_purgeaddr().
1340 * This entire work should only be done once, for the default FIB.
1341 */
1342 static int
1343 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1344 {
1345 struct sockaddr_in6 mltaddr, mltmask;
1346 struct in6_multi_mship *imm;
1347 struct rtentry *rt;
1348 struct sockaddr_in6 sin6;
1349 int error;
1350
1351 /*
1352 * Leave from multicast groups we have joined for the interface.
1353 */
1354 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1355 LIST_REMOVE(imm, i6mm_chain);
1356 in6_leavegroup(imm);
1357 }
1358
1359 /*
1360 * Remove the link-local all-nodes address.
1361 */
1362 bzero(&mltmask, sizeof(mltmask));
1363 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1364 mltmask.sin6_family = AF_INET6;
1365 mltmask.sin6_addr = in6mask32;
1366
1367 bzero(&mltaddr, sizeof(mltaddr));
1368 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1369 mltaddr.sin6_family = AF_INET6;
1370 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1371
1372 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1373 return (error);
1374
1375 /*
1376 * As for the mltaddr above, proactively prepare the sin6 to avoid
1377 * rtentry un- and re-locking.
1378 */
1379 if (ifa0 != NULL) {
1380 bzero(&sin6, sizeof(sin6));
1381 sin6.sin6_len = sizeof(sin6);
1382 sin6.sin6_family = AF_INET6;
1383 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1384 sizeof(sin6.sin6_addr));
1385 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1386 if (error != 0)
1387 return (error);
1388 }
1389
1390 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1391 if (rt != NULL && rt->rt_gateway != NULL &&
1392 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1393 &ia->ia_addr.sin6_addr,
1394 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1395 /*
1396 * If no more IPv6 address exists on this interface then
1397 * remove the multicast address route.
1398 */
1399 if (ifa0 == NULL) {
1400 memcpy(&mltaddr.sin6_addr,
1401 &satosin6(rt_key(rt))->sin6_addr,
1402 sizeof(mltaddr.sin6_addr));
1403 RTFREE_LOCKED(rt);
1404 error = in6_rtrequest(RTM_DELETE,
1405 (struct sockaddr *)&mltaddr,
1406 (struct sockaddr *)&ia->ia_addr,
1407 (struct sockaddr *)&mltmask, RTF_UP,
1408 (struct rtentry **)0, RT_DEFAULT_FIB);
1409 if (error)
1410 log(LOG_INFO, "%s: link-local all-nodes "
1411 "multicast address deletion error\n",
1412 __func__);
1413 } else {
1414 /*
1415 * Replace the gateway of the route.
1416 */
1417 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1418 RTFREE_LOCKED(rt);
1419 }
1420 } else {
1421 if (rt != NULL)
1422 RTFREE_LOCKED(rt);
1423 }
1424
1425 /*
1426 * Remove the node-local all-nodes address.
1427 */
1428 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1429 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1430 return (error);
1431
1432 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1433 if (rt != NULL && rt->rt_gateway != NULL &&
1434 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1435 &ia->ia_addr.sin6_addr,
1436 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1437 /*
1438 * If no more IPv6 address exists on this interface then
1439 * remove the multicast address route.
1440 */
1441 if (ifa0 == NULL) {
1442 memcpy(&mltaddr.sin6_addr,
1443 &satosin6(rt_key(rt))->sin6_addr,
1444 sizeof(mltaddr.sin6_addr));
1445
1446 RTFREE_LOCKED(rt);
1447 error = in6_rtrequest(RTM_DELETE,
1448 (struct sockaddr *)&mltaddr,
1449 (struct sockaddr *)&ia->ia_addr,
1450 (struct sockaddr *)&mltmask, RTF_UP,
1451 (struct rtentry **)0, RT_DEFAULT_FIB);
1452 if (error)
1453 log(LOG_INFO, "%s: node-local all-nodes"
1454 "multicast address deletion error\n",
1455 __func__);
1456 } else {
1457 /*
1458 * Replace the gateway of the route.
1459 */
1460 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1461 RTFREE_LOCKED(rt);
1462 }
1463 } else {
1464 if (rt != NULL)
1465 RTFREE_LOCKED(rt);
1466 }
1467
1468 return (0);
1469 }
1470
1471 void
1472 in6_purgeaddr(struct ifaddr *ifa)
1473 {
1474 struct ifnet *ifp = ifa->ifa_ifp;
1475 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1476 int plen, error;
1477 struct ifaddr *ifa0;
1478
1479 if (ifa->ifa_carp)
1480 (*carp_detach_p)(ifa);
1481
1482 /*
1483 * find another IPv6 address as the gateway for the
1484 * link-local and node-local all-nodes multicast
1485 * address routes
1486 */
1487 IF_ADDR_RLOCK(ifp);
1488 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1489 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1490 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1491 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1492 continue;
1493 else
1494 break;
1495 }
1496 if (ifa0 != NULL)
1497 ifa_ref(ifa0);
1498 IF_ADDR_RUNLOCK(ifp);
1499
1500 /*
1501 * Remove the loopback route to the interface address.
1502 * The check for the current setting of "nd6_useloopback"
1503 * is not needed.
1504 */
1505 if (ia->ia_flags & IFA_RTSELF) {
1506 error = ifa_del_loopback_route((struct ifaddr *)ia,
1507 (struct sockaddr *)&ia->ia_addr);
1508 if (error == 0)
1509 ia->ia_flags &= ~IFA_RTSELF;
1510 }
1511
1512 /* stop DAD processing */
1513 nd6_dad_stop(ifa);
1514
1515 /* Remove local address entry from lltable. */
1516 in6_ifremloop(ifa);
1517
1518 /* Leave multicast groups. */
1519 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1520
1521 if (ifa0 != NULL)
1522 ifa_free(ifa0);
1523
1524 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1525 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1526 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1527 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1528 if (error != 0)
1529 log(LOG_INFO, "%s: err=%d, destination address delete "
1530 "failed\n", __func__, error);
1531 ia->ia_flags &= ~IFA_ROUTE;
1532 }
1533
1534 in6_unlink_ifa(ia, ifp);
1535 }
1536
1537 static void
1538 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1539 {
1540 char ip6buf[INET6_ADDRSTRLEN];
1541
1542 IF_ADDR_WLOCK(ifp);
1543 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1544 IF_ADDR_WUNLOCK(ifp);
1545 ifa_free(&ia->ia_ifa); /* if_addrhead */
1546
1547 /*
1548 * Defer the release of what might be the last reference to the
1549 * in6_ifaddr so that it can't be freed before the remainder of the
1550 * cleanup.
1551 */
1552 IN6_IFADDR_WLOCK();
1553 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1554 LIST_REMOVE(ia, ia6_hash);
1555 IN6_IFADDR_WUNLOCK();
1556
1557 /*
1558 * Release the reference to the base prefix. There should be a
1559 * positive reference.
1560 */
1561 if (ia->ia6_ndpr == NULL) {
1562 nd6log((LOG_NOTICE,
1563 "in6_unlink_ifa: autoconf'ed address "
1564 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1565 } else {
1566 ia->ia6_ndpr->ndpr_refcnt--;
1567 ia->ia6_ndpr = NULL;
1568 }
1569
1570 /*
1571 * Also, if the address being removed is autoconf'ed, call
1572 * pfxlist_onlink_check() since the release might affect the status of
1573 * other (detached) addresses.
1574 */
1575 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1576 pfxlist_onlink_check();
1577 }
1578 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1579 }
1580
1581 void
1582 in6_purgeif(struct ifnet *ifp)
1583 {
1584 struct ifaddr *ifa, *nifa;
1585
1586 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1587 if (ifa->ifa_addr->sa_family != AF_INET6)
1588 continue;
1589 in6_purgeaddr(ifa);
1590 }
1591
1592 in6_ifdetach(ifp);
1593 }
1594
1595 /*
1596 * SIOC[GAD]LIFADDR.
1597 * SIOCGLIFADDR: get first address. (?)
1598 * SIOCGLIFADDR with IFLR_PREFIX:
1599 * get first address that matches the specified prefix.
1600 * SIOCALIFADDR: add the specified address.
1601 * SIOCALIFADDR with IFLR_PREFIX:
1602 * add the specified prefix, filling hostid part from
1603 * the first link-local address. prefixlen must be <= 64.
1604 * SIOCDLIFADDR: delete the specified address.
1605 * SIOCDLIFADDR with IFLR_PREFIX:
1606 * delete the first address that matches the specified prefix.
1607 * return values:
1608 * EINVAL on invalid parameters
1609 * EADDRNOTAVAIL on prefix match failed/specified address not found
1610 * other values may be returned from in6_ioctl()
1611 *
1612 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1613 * this is to accomodate address naming scheme other than RFC2374,
1614 * in the future.
1615 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1616 * address encoding scheme. (see figure on page 8)
1617 * Notifies other subsystems about address change/arrival:
1618 * 1) Notifies device handler on the first IPv6 address assignment
1619 * 2) Handle routing table changes for P2P links and route
1620 * 3) Handle routing table changes for address host route
1621 */
1622 static int
1623 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1624 struct ifnet *ifp, struct thread *td)
1625 {
1626 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1627 struct ifaddr *ifa;
1628 struct sockaddr *sa;
1629
1630 /* sanity checks */
1631 if (!data || !ifp) {
1632 panic("invalid argument to in6_lifaddr_ioctl");
1633 /* NOTREACHED */
1634 }
1635
1636 switch (cmd) {
1637 case SIOCGLIFADDR:
1638 /* address must be specified on GET with IFLR_PREFIX */
1639 if ((iflr->flags & IFLR_PREFIX) == 0)
1640 break;
1641 /* FALLTHROUGH */
1642 case SIOCALIFADDR:
1643 case SIOCDLIFADDR:
1644 /* address must be specified on ADD and DELETE */
1645 sa = (struct sockaddr *)&iflr->addr;
1646 if (sa->sa_family != AF_INET6)
1647 return EINVAL;
1648 if (sa->sa_len != sizeof(struct sockaddr_in6))
1649 return EINVAL;
1650 /* XXX need improvement */
1651 sa = (struct sockaddr *)&iflr->dstaddr;
1652 if (sa->sa_family && sa->sa_family != AF_INET6)
1653 return EINVAL;
1654 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1655 return EINVAL;
1656 break;
1657 default: /* shouldn't happen */
1658 #if 0
1659 panic("invalid cmd to in6_lifaddr_ioctl");
1660 /* NOTREACHED */
1661 #else
1662 return EOPNOTSUPP;
1663 #endif
1664 }
1665 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1666 return EINVAL;
1667
1668 switch (cmd) {
1669 case SIOCALIFADDR:
1670 {
1671 struct in6_aliasreq ifra;
1672 struct in6_addr *hostid = NULL;
1673 int prefixlen;
1674
1675 ifa = NULL;
1676 if ((iflr->flags & IFLR_PREFIX) != 0) {
1677 struct sockaddr_in6 *sin6;
1678
1679 /*
1680 * hostid is to fill in the hostid part of the
1681 * address. hostid points to the first link-local
1682 * address attached to the interface.
1683 */
1684 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1685 if (!ifa)
1686 return EADDRNOTAVAIL;
1687 hostid = IFA_IN6(ifa);
1688
1689 /* prefixlen must be <= 64. */
1690 if (64 < iflr->prefixlen) {
1691 if (ifa != NULL)
1692 ifa_free(ifa);
1693 return EINVAL;
1694 }
1695 prefixlen = iflr->prefixlen;
1696
1697 /* hostid part must be zero. */
1698 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1699 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1700 sin6->sin6_addr.s6_addr32[3] != 0) {
1701 if (ifa != NULL)
1702 ifa_free(ifa);
1703 return EINVAL;
1704 }
1705 } else
1706 prefixlen = iflr->prefixlen;
1707
1708 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1709 bzero(&ifra, sizeof(ifra));
1710 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1711
1712 bcopy(&iflr->addr, &ifra.ifra_addr,
1713 ((struct sockaddr *)&iflr->addr)->sa_len);
1714 if (hostid) {
1715 /* fill in hostid part */
1716 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1717 hostid->s6_addr32[2];
1718 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1719 hostid->s6_addr32[3];
1720 }
1721
1722 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1723 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1724 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1725 if (hostid) {
1726 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1727 hostid->s6_addr32[2];
1728 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1729 hostid->s6_addr32[3];
1730 }
1731 }
1732 if (ifa != NULL)
1733 ifa_free(ifa);
1734
1735 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1736 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1737
1738 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1739 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1740 }
1741 case SIOCGLIFADDR:
1742 case SIOCDLIFADDR:
1743 {
1744 struct in6_ifaddr *ia;
1745 struct in6_addr mask, candidate, match;
1746 struct sockaddr_in6 *sin6;
1747 int cmp;
1748
1749 bzero(&mask, sizeof(mask));
1750 if (iflr->flags & IFLR_PREFIX) {
1751 /* lookup a prefix rather than address. */
1752 in6_prefixlen2mask(&mask, iflr->prefixlen);
1753
1754 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1755 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1756 match.s6_addr32[0] &= mask.s6_addr32[0];
1757 match.s6_addr32[1] &= mask.s6_addr32[1];
1758 match.s6_addr32[2] &= mask.s6_addr32[2];
1759 match.s6_addr32[3] &= mask.s6_addr32[3];
1760
1761 /* if you set extra bits, that's wrong */
1762 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1763 return EINVAL;
1764
1765 cmp = 1;
1766 } else {
1767 if (cmd == SIOCGLIFADDR) {
1768 /* on getting an address, take the 1st match */
1769 cmp = 0; /* XXX */
1770 } else {
1771 /* on deleting an address, do exact match */
1772 in6_prefixlen2mask(&mask, 128);
1773 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1774 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1775
1776 cmp = 1;
1777 }
1778 }
1779
1780 IF_ADDR_RLOCK(ifp);
1781 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1782 if (ifa->ifa_addr->sa_family != AF_INET6)
1783 continue;
1784 if (!cmp)
1785 break;
1786
1787 /*
1788 * XXX: this is adhoc, but is necessary to allow
1789 * a user to specify fe80::/64 (not /10) for a
1790 * link-local address.
1791 */
1792 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1793 in6_clearscope(&candidate);
1794 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1795 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1796 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1797 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1798 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1799 break;
1800 }
1801 if (ifa != NULL)
1802 ifa_ref(ifa);
1803 IF_ADDR_RUNLOCK(ifp);
1804 if (!ifa)
1805 return EADDRNOTAVAIL;
1806 ia = ifa2ia6(ifa);
1807
1808 if (cmd == SIOCGLIFADDR) {
1809 int error;
1810
1811 /* fill in the if_laddrreq structure */
1812 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1813 error = sa6_recoverscope(
1814 (struct sockaddr_in6 *)&iflr->addr);
1815 if (error != 0) {
1816 ifa_free(ifa);
1817 return (error);
1818 }
1819
1820 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1821 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1822 ia->ia_dstaddr.sin6_len);
1823 error = sa6_recoverscope(
1824 (struct sockaddr_in6 *)&iflr->dstaddr);
1825 if (error != 0) {
1826 ifa_free(ifa);
1827 return (error);
1828 }
1829 } else
1830 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1831
1832 iflr->prefixlen =
1833 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1834
1835 iflr->flags = ia->ia6_flags; /* XXX */
1836 ifa_free(ifa);
1837
1838 return 0;
1839 } else {
1840 struct in6_aliasreq ifra;
1841
1842 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1843 bzero(&ifra, sizeof(ifra));
1844 bcopy(iflr->iflr_name, ifra.ifra_name,
1845 sizeof(ifra.ifra_name));
1846
1847 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1848 ia->ia_addr.sin6_len);
1849 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1850 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1851 ia->ia_dstaddr.sin6_len);
1852 } else {
1853 bzero(&ifra.ifra_dstaddr,
1854 sizeof(ifra.ifra_dstaddr));
1855 }
1856 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1857 ia->ia_prefixmask.sin6_len);
1858
1859 ifra.ifra_flags = ia->ia6_flags;
1860 ifa_free(ifa);
1861 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1862 ifp, td);
1863 }
1864 }
1865 }
1866
1867 return EOPNOTSUPP; /* just for safety */
1868 }
1869
1870 /*
1871 * Initialize an interface's IPv6 address and routing table entry.
1872 */
1873 static int
1874 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1875 struct sockaddr_in6 *sin6, int newhost)
1876 {
1877 int error = 0, plen, ifacount = 0;
1878 struct ifaddr *ifa;
1879
1880 /*
1881 * Give the interface a chance to initialize
1882 * if this is its first address,
1883 * and to validate the address if necessary.
1884 */
1885 IF_ADDR_RLOCK(ifp);
1886 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1887 if (ifa->ifa_addr->sa_family != AF_INET6)
1888 continue;
1889 ifacount++;
1890 }
1891 IF_ADDR_RUNLOCK(ifp);
1892
1893 ia->ia_addr = *sin6;
1894
1895 if (ifacount <= 1 && ifp->if_ioctl) {
1896 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1897 if (error)
1898 return (error);
1899 }
1900
1901 ia->ia_ifa.ifa_metric = ifp->if_metric;
1902
1903 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1904
1905 /*
1906 * Special case:
1907 * If a new destination address is specified for a point-to-point
1908 * interface, install a route to the destination as an interface
1909 * direct route.
1910 * XXX: the logic below rejects assigning multiple addresses on a p2p
1911 * interface that share the same destination.
1912 */
1913 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1914 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1915 ia->ia_dstaddr.sin6_family == AF_INET6) {
1916 int rtflags = RTF_UP | RTF_HOST;
1917 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1918 if (error)
1919 return (error);
1920 ia->ia_flags |= IFA_ROUTE;
1921 /*
1922 * Handle the case for ::1 .
1923 */
1924 if (ifp->if_flags & IFF_LOOPBACK)
1925 ia->ia_flags |= IFA_RTSELF;
1926 }
1927
1928 /*
1929 * add a loopback route to self
1930 */
1931 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1932 error = ifa_add_loopback_route((struct ifaddr *)ia,
1933 (struct sockaddr *)&ia->ia_addr);
1934 if (error == 0)
1935 ia->ia_flags |= IFA_RTSELF;
1936 }
1937
1938 /* Add local address to lltable, if necessary (ex. on p2p link). */
1939 if (newhost)
1940 in6_ifaddloop(&(ia->ia_ifa));
1941
1942 return (error);
1943 }
1944
1945 /*
1946 * Find an IPv6 interface link-local address specific to an interface.
1947 * ifaddr is returned referenced.
1948 */
1949 struct in6_ifaddr *
1950 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1951 {
1952 struct ifaddr *ifa;
1953
1954 IF_ADDR_RLOCK(ifp);
1955 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1956 if (ifa->ifa_addr->sa_family != AF_INET6)
1957 continue;
1958 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1959 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1960 ignoreflags) != 0)
1961 continue;
1962 ifa_ref(ifa);
1963 break;
1964 }
1965 }
1966 IF_ADDR_RUNLOCK(ifp);
1967
1968 return ((struct in6_ifaddr *)ifa);
1969 }
1970
1971
1972 /*
1973 * find the internet address corresponding to a given interface and address.
1974 * ifaddr is returned referenced.
1975 */
1976 struct in6_ifaddr *
1977 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1978 {
1979 struct ifaddr *ifa;
1980
1981 IF_ADDR_RLOCK(ifp);
1982 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1983 if (ifa->ifa_addr->sa_family != AF_INET6)
1984 continue;
1985 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1986 ifa_ref(ifa);
1987 break;
1988 }
1989 }
1990 IF_ADDR_RUNLOCK(ifp);
1991
1992 return ((struct in6_ifaddr *)ifa);
1993 }
1994
1995 /*
1996 * Find a link-local scoped address on ifp and return it if any.
1997 */
1998 struct in6_ifaddr *
1999 in6ifa_llaonifp(struct ifnet *ifp)
2000 {
2001 struct sockaddr_in6 *sin6;
2002 struct ifaddr *ifa;
2003
2004 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2005 return (NULL);
2006 IF_ADDR_RLOCK(ifp);
2007 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2008 if (ifa->ifa_addr->sa_family != AF_INET6)
2009 continue;
2010 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2011 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
2012 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
2013 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
2014 break;
2015 }
2016 IF_ADDR_RUNLOCK(ifp);
2017
2018 return ((struct in6_ifaddr *)ifa);
2019 }
2020
2021 /*
2022 * Convert IP6 address to printable (loggable) representation. Caller
2023 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
2024 */
2025 static char digits[] = "0123456789abcdef";
2026 char *
2027 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
2028 {
2029 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
2030 char *cp;
2031 const u_int16_t *a = (const u_int16_t *)addr;
2032 const u_int8_t *d;
2033 int dcolon = 0, zero = 0;
2034
2035 cp = ip6buf;
2036
2037 for (i = 0; i < 8; i++) {
2038 if (*(a + i) == 0) {
2039 cnt++;
2040 if (cnt == 1)
2041 idx = i;
2042 }
2043 else if (maxcnt < cnt) {
2044 maxcnt = cnt;
2045 index = idx;
2046 cnt = 0;
2047 }
2048 }
2049 if (maxcnt < cnt) {
2050 maxcnt = cnt;
2051 index = idx;
2052 }
2053
2054 for (i = 0; i < 8; i++) {
2055 if (dcolon == 1) {
2056 if (*a == 0) {
2057 if (i == 7)
2058 *cp++ = ':';
2059 a++;
2060 continue;
2061 } else
2062 dcolon = 2;
2063 }
2064 if (*a == 0) {
2065 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2066 if (i == 0)
2067 *cp++ = ':';
2068 *cp++ = ':';
2069 dcolon = 1;
2070 } else {
2071 *cp++ = '';
2072 *cp++ = ':';
2073 }
2074 a++;
2075 continue;
2076 }
2077 d = (const u_char *)a;
2078 /* Try to eliminate leading zeros in printout like in :0001. */
2079 zero = 1;
2080 *cp = digits[*d >> 4];
2081 if (*cp != '') {
2082 zero = 0;
2083 cp++;
2084 }
2085 *cp = digits[*d++ & 0xf];
2086 if (zero == 0 || (*cp != '')) {
2087 zero = 0;
2088 cp++;
2089 }
2090 *cp = digits[*d >> 4];
2091 if (zero == 0 || (*cp != '')) {
2092 zero = 0;
2093 cp++;
2094 }
2095 *cp++ = digits[*d & 0xf];
2096 *cp++ = ':';
2097 a++;
2098 }
2099 *--cp = '\0';
2100 return (ip6buf);
2101 }
2102
2103 int
2104 in6_localaddr(struct in6_addr *in6)
2105 {
2106 struct in6_ifaddr *ia;
2107
2108 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2109 return 1;
2110
2111 IN6_IFADDR_RLOCK();
2112 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2113 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2114 &ia->ia_prefixmask.sin6_addr)) {
2115 IN6_IFADDR_RUNLOCK();
2116 return 1;
2117 }
2118 }
2119 IN6_IFADDR_RUNLOCK();
2120
2121 return (0);
2122 }
2123
2124 /*
2125 * Return 1 if an internet address is for the local host and configured
2126 * on one of its interfaces.
2127 */
2128 int
2129 in6_localip(struct in6_addr *in6)
2130 {
2131 struct in6_ifaddr *ia;
2132
2133 IN6_IFADDR_RLOCK();
2134 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
2135 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2136 IN6_IFADDR_RUNLOCK();
2137 return (1);
2138 }
2139 }
2140 IN6_IFADDR_RUNLOCK();
2141 return (0);
2142 }
2143
2144 int
2145 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2146 {
2147 struct in6_ifaddr *ia;
2148
2149 IN6_IFADDR_RLOCK();
2150 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
2151 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
2152 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2153 IN6_IFADDR_RUNLOCK();
2154 return (1); /* true */
2155 }
2156 break;
2157 }
2158 }
2159 IN6_IFADDR_RUNLOCK();
2160
2161 return (0); /* false */
2162 }
2163
2164 /*
2165 * return length of part which dst and src are equal
2166 * hard coding...
2167 */
2168 int
2169 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2170 {
2171 int match = 0;
2172 u_char *s = (u_char *)src, *d = (u_char *)dst;
2173 u_char *lim = s + 16, r;
2174
2175 while (s < lim)
2176 if ((r = (*d++ ^ *s++)) != 0) {
2177 while (r < 128) {
2178 match++;
2179 r <<= 1;
2180 }
2181 break;
2182 } else
2183 match += 8;
2184 return match;
2185 }
2186
2187 /* XXX: to be scope conscious */
2188 int
2189 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2190 {
2191 int bytelen, bitlen;
2192
2193 /* sanity check */
2194 if (0 > len || len > 128) {
2195 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2196 len);
2197 return (0);
2198 }
2199
2200 bytelen = len / 8;
2201 bitlen = len % 8;
2202
2203 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2204 return (0);
2205 if (bitlen != 0 &&
2206 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2207 p2->s6_addr[bytelen] >> (8 - bitlen))
2208 return (0);
2209
2210 return (1);
2211 }
2212
2213 void
2214 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2215 {
2216 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2217 int bytelen, bitlen, i;
2218
2219 /* sanity check */
2220 if (0 > len || len > 128) {
2221 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2222 len);
2223 return;
2224 }
2225
2226 bzero(maskp, sizeof(*maskp));
2227 bytelen = len / 8;
2228 bitlen = len % 8;
2229 for (i = 0; i < bytelen; i++)
2230 maskp->s6_addr[i] = 0xff;
2231 if (bitlen)
2232 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2233 }
2234
2235 /*
2236 * return the best address out of the same scope. if no address was
2237 * found, return the first valid address from designated IF.
2238 */
2239 struct in6_ifaddr *
2240 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2241 {
2242 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2243 struct ifaddr *ifa;
2244 struct in6_ifaddr *besta = 0;
2245 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2246
2247 dep[0] = dep[1] = NULL;
2248
2249 /*
2250 * We first look for addresses in the same scope.
2251 * If there is one, return it.
2252 * If two or more, return one which matches the dst longest.
2253 * If none, return one of global addresses assigned other ifs.
2254 */
2255 IF_ADDR_RLOCK(ifp);
2256 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2257 if (ifa->ifa_addr->sa_family != AF_INET6)
2258 continue;
2259 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2260 continue; /* XXX: is there any case to allow anycast? */
2261 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2262 continue; /* don't use this interface */
2263 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2264 continue;
2265 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2266 if (V_ip6_use_deprecated)
2267 dep[0] = (struct in6_ifaddr *)ifa;
2268 continue;
2269 }
2270
2271 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2272 /*
2273 * call in6_matchlen() as few as possible
2274 */
2275 if (besta) {
2276 if (blen == -1)
2277 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2278 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2279 if (tlen > blen) {
2280 blen = tlen;
2281 besta = (struct in6_ifaddr *)ifa;
2282 }
2283 } else
2284 besta = (struct in6_ifaddr *)ifa;
2285 }
2286 }
2287 if (besta) {
2288 ifa_ref(&besta->ia_ifa);
2289 IF_ADDR_RUNLOCK(ifp);
2290 return (besta);
2291 }
2292
2293 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2294 if (ifa->ifa_addr->sa_family != AF_INET6)
2295 continue;
2296 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2297 continue; /* XXX: is there any case to allow anycast? */
2298 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2299 continue; /* don't use this interface */
2300 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2301 continue;
2302 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2303 if (V_ip6_use_deprecated)
2304 dep[1] = (struct in6_ifaddr *)ifa;
2305 continue;
2306 }
2307
2308 if (ifa != NULL)
2309 ifa_ref(ifa);
2310 IF_ADDR_RUNLOCK(ifp);
2311 return (struct in6_ifaddr *)ifa;
2312 }
2313
2314 /* use the last-resort values, that are, deprecated addresses */
2315 if (dep[0]) {
2316 ifa_ref((struct ifaddr *)dep[0]);
2317 IF_ADDR_RUNLOCK(ifp);
2318 return dep[0];
2319 }
2320 if (dep[1]) {
2321 ifa_ref((struct ifaddr *)dep[1]);
2322 IF_ADDR_RUNLOCK(ifp);
2323 return dep[1];
2324 }
2325
2326 IF_ADDR_RUNLOCK(ifp);
2327 return NULL;
2328 }
2329
2330 /*
2331 * perform DAD when interface becomes IFF_UP.
2332 */
2333 void
2334 in6_if_up(struct ifnet *ifp)
2335 {
2336 struct ifaddr *ifa;
2337 struct in6_ifaddr *ia;
2338
2339 IF_ADDR_RLOCK(ifp);
2340 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2341 if (ifa->ifa_addr->sa_family != AF_INET6)
2342 continue;
2343 ia = (struct in6_ifaddr *)ifa;
2344 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2345 /*
2346 * The TENTATIVE flag was likely set by hand
2347 * beforehand, implicitly indicating the need for DAD.
2348 * We may be able to skip the random delay in this
2349 * case, but we impose delays just in case.
2350 */
2351 nd6_dad_start(ifa,
2352 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2353 }
2354 }
2355 IF_ADDR_RUNLOCK(ifp);
2356
2357 /*
2358 * special cases, like 6to4, are handled in in6_ifattach
2359 */
2360 in6_ifattach(ifp, NULL);
2361 }
2362
2363 int
2364 in6if_do_dad(struct ifnet *ifp)
2365 {
2366 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2367 return (0);
2368
2369 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
2370 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
2371 return (0);
2372
2373 switch (ifp->if_type) {
2374 #ifdef IFT_DUMMY
2375 case IFT_DUMMY:
2376 #endif
2377 case IFT_FAITH:
2378 /*
2379 * These interfaces do not have the IFF_LOOPBACK flag,
2380 * but loop packets back. We do not have to do DAD on such
2381 * interfaces. We should even omit it, because loop-backed
2382 * NS would confuse the DAD procedure.
2383 */
2384 return (0);
2385 default:
2386 /*
2387 * Our DAD routine requires the interface up and running.
2388 * However, some interfaces can be up before the RUNNING
2389 * status. Additionaly, users may try to assign addresses
2390 * before the interface becomes up (or running).
2391 * This function returns EAGAIN in that case.
2392 * The caller should mark "tentative" on the address instead of
2393 * performing DAD immediately.
2394 */
2395 if (!((ifp->if_flags & IFF_UP) &&
2396 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2397 return (EAGAIN);
2398
2399 return (1);
2400 }
2401 }
2402
2403 /*
2404 * Calculate max IPv6 MTU through all the interfaces and store it
2405 * to in6_maxmtu.
2406 */
2407 void
2408 in6_setmaxmtu(void)
2409 {
2410 unsigned long maxmtu = 0;
2411 struct ifnet *ifp;
2412
2413 IFNET_RLOCK_NOSLEEP();
2414 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2415 /* this function can be called during ifnet initialization */
2416 if (!ifp->if_afdata[AF_INET6])
2417 continue;
2418 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2419 IN6_LINKMTU(ifp) > maxmtu)
2420 maxmtu = IN6_LINKMTU(ifp);
2421 }
2422 IFNET_RUNLOCK_NOSLEEP();
2423 if (maxmtu) /* update only when maxmtu is positive */
2424 V_in6_maxmtu = maxmtu;
2425 }
2426
2427 /*
2428 * Provide the length of interface identifiers to be used for the link attached
2429 * to the given interface. The length should be defined in "IPv6 over
2430 * xxx-link" document. Note that address architecture might also define
2431 * the length for a particular set of address prefixes, regardless of the
2432 * link type. As clarified in rfc2462bis, those two definitions should be
2433 * consistent, and those really are as of August 2004.
2434 */
2435 int
2436 in6_if2idlen(struct ifnet *ifp)
2437 {
2438 switch (ifp->if_type) {
2439 case IFT_ETHER: /* RFC2464 */
2440 #ifdef IFT_PROPVIRTUAL
2441 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2442 #endif
2443 #ifdef IFT_L2VLAN
2444 case IFT_L2VLAN: /* ditto */
2445 #endif
2446 #ifdef IFT_IEEE80211
2447 case IFT_IEEE80211: /* ditto */
2448 #endif
2449 #ifdef IFT_MIP
2450 case IFT_MIP: /* ditto */
2451 #endif
2452 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */
2453 case IFT_INFINIBAND:
2454 return (64);
2455 case IFT_FDDI: /* RFC2467 */
2456 return (64);
2457 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2458 return (64);
2459 case IFT_PPP: /* RFC2472 */
2460 return (64);
2461 case IFT_ARCNET: /* RFC2497 */
2462 return (64);
2463 case IFT_FRELAY: /* RFC2590 */
2464 return (64);
2465 case IFT_IEEE1394: /* RFC3146 */
2466 return (64);
2467 case IFT_GIF:
2468 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2469 case IFT_LOOP:
2470 return (64); /* XXX: is this really correct? */
2471 default:
2472 /*
2473 * Unknown link type:
2474 * It might be controversial to use the today's common constant
2475 * of 64 for these cases unconditionally. For full compliance,
2476 * we should return an error in this case. On the other hand,
2477 * if we simply miss the standard for the link type or a new
2478 * standard is defined for a new link type, the IFID length
2479 * is very likely to be the common constant. As a compromise,
2480 * we always use the constant, but make an explicit notice
2481 * indicating the "unknown" case.
2482 */
2483 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2484 return (64);
2485 }
2486 }
2487
2488 #include <sys/sysctl.h>
2489
2490 struct in6_llentry {
2491 struct llentry base;
2492 struct sockaddr_in6 l3_addr6;
2493 };
2494
2495 /*
2496 * Deletes an address from the address table.
2497 * This function is called by the timer functions
2498 * such as arptimer() and nd6_llinfo_timer(), and
2499 * the caller does the locking.
2500 */
2501 static void
2502 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2503 {
2504 LLE_WUNLOCK(lle);
2505 LLE_LOCK_DESTROY(lle);
2506 free(lle, M_LLTABLE);
2507 }
2508
2509 static struct llentry *
2510 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2511 {
2512 struct in6_llentry *lle;
2513
2514 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2515 if (lle == NULL) /* NB: caller generates msg */
2516 return NULL;
2517
2518 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2519 lle->base.lle_refcnt = 1;
2520 lle->base.lle_free = in6_lltable_free;
2521 LLE_LOCK_INIT(&lle->base);
2522 callout_init(&lle->base.ln_timer_ch, 1);
2523
2524 return (&lle->base);
2525 }
2526
2527 static void
2528 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2529 const struct sockaddr *mask, u_int flags)
2530 {
2531 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2532 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2533 struct llentry *lle, *next;
2534 int i;
2535
2536 /*
2537 * (flags & LLE_STATIC) means deleting all entries
2538 * including static ND6 entries.
2539 */
2540 IF_AFDATA_WLOCK(llt->llt_ifp);
2541 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2542 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2543 if (IN6_ARE_MASKED_ADDR_EQUAL(
2544 &satosin6(L3_ADDR(lle))->sin6_addr,
2545 &pfx->sin6_addr, &msk->sin6_addr) &&
2546 ((flags & LLE_STATIC) ||
2547 !(lle->la_flags & LLE_STATIC))) {
2548 LLE_WLOCK(lle);
2549 if (callout_stop(&lle->la_timer))
2550 LLE_REMREF(lle);
2551 llentry_free(lle);
2552 }
2553 }
2554 }
2555 IF_AFDATA_WUNLOCK(llt->llt_ifp);
2556 }
2557
2558 static int
2559 in6_lltable_rtcheck(struct ifnet *ifp,
2560 u_int flags,
2561 const struct sockaddr *l3addr)
2562 {
2563 struct rtentry *rt;
2564 char ip6buf[INET6_ADDRSTRLEN];
2565
2566 KASSERT(l3addr->sa_family == AF_INET6,
2567 ("sin_family %d", l3addr->sa_family));
2568
2569 /* Our local addresses are always only installed on the default FIB. */
2570 /* XXX rtalloc1 should take a const param */
2571 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2572 RT_DEFAULT_FIB);
2573 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2574 struct ifaddr *ifa;
2575 /*
2576 * Create an ND6 cache for an IPv6 neighbor
2577 * that is not covered by our own prefix.
2578 */
2579 /* XXX ifaof_ifpforaddr should take a const param */
2580 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2581 if (ifa != NULL) {
2582 ifa_free(ifa);
2583 if (rt != NULL)
2584 RTFREE_LOCKED(rt);
2585 return 0;
2586 }
2587 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2588 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2589 if (rt != NULL)
2590 RTFREE_LOCKED(rt);
2591 return EINVAL;
2592 }
2593 RTFREE_LOCKED(rt);
2594 return 0;
2595 }
2596
2597 static struct llentry *
2598 in6_lltable_lookup(struct lltable *llt, u_int flags,
2599 const struct sockaddr *l3addr)
2600 {
2601 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2602 struct ifnet *ifp = llt->llt_ifp;
2603 struct llentry *lle;
2604 struct llentries *lleh;
2605 u_int hashkey;
2606
2607 IF_AFDATA_LOCK_ASSERT(ifp);
2608 KASSERT(l3addr->sa_family == AF_INET6,
2609 ("sin_family %d", l3addr->sa_family));
2610
2611 hashkey = sin6->sin6_addr.s6_addr32[3];
2612 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2613 LIST_FOREACH(lle, lleh, lle_next) {
2614 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2615 if (lle->la_flags & LLE_DELETED)
2616 continue;
2617 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2618 sizeof(struct in6_addr)) == 0)
2619 break;
2620 }
2621
2622 if (lle == NULL) {
2623 if (!(flags & LLE_CREATE))
2624 return (NULL);
2625 IF_AFDATA_WLOCK_ASSERT(ifp);
2626 /*
2627 * A route that covers the given address must have
2628 * been installed 1st because we are doing a resolution,
2629 * verify this.
2630 */
2631 if (!(flags & LLE_IFADDR) &&
2632 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2633 return NULL;
2634
2635 lle = in6_lltable_new(l3addr, flags);
2636 if (lle == NULL) {
2637 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2638 return NULL;
2639 }
2640 lle->la_flags = flags & ~LLE_CREATE;
2641 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2642 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2643 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2644 }
2645
2646 lle->lle_tbl = llt;
2647 lle->lle_head = lleh;
2648 lle->la_flags |= LLE_LINKED;
2649 LIST_INSERT_HEAD(lleh, lle, lle_next);
2650 } else if (flags & LLE_DELETE) {
2651 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2652 LLE_WLOCK(lle);
2653 lle->la_flags |= LLE_DELETED;
2654 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2655 #ifdef DIAGNOSTIC
2656 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2657 #endif
2658 if ((lle->la_flags &
2659 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2660 llentry_free(lle);
2661 else
2662 LLE_WUNLOCK(lle);
2663 }
2664 lle = (void *)-1;
2665 }
2666 if (LLE_IS_VALID(lle)) {
2667 if (flags & LLE_EXCLUSIVE)
2668 LLE_WLOCK(lle);
2669 else
2670 LLE_RLOCK(lle);
2671 }
2672 return (lle);
2673 }
2674
2675 static int
2676 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2677 {
2678 struct ifnet *ifp = llt->llt_ifp;
2679 struct llentry *lle;
2680 /* XXX stack use */
2681 struct {
2682 struct rt_msghdr rtm;
2683 struct sockaddr_in6 sin6;
2684 /*
2685 * ndp.c assumes that sdl is word aligned
2686 */
2687 #ifdef __LP64__
2688 uint32_t pad;
2689 #endif
2690 struct sockaddr_dl sdl;
2691 } ndpc;
2692 int i, error;
2693
2694 if (ifp->if_flags & IFF_LOOPBACK)
2695 return 0;
2696
2697 LLTABLE_LOCK_ASSERT();
2698
2699 error = 0;
2700 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2701 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2702 struct sockaddr_dl *sdl;
2703
2704 /* skip deleted or invalid entries */
2705 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2706 continue;
2707 /* Skip if jailed and not a valid IP of the prison. */
2708 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2709 continue;
2710 /*
2711 * produce a msg made of:
2712 * struct rt_msghdr;
2713 * struct sockaddr_in6 (IPv6)
2714 * struct sockaddr_dl;
2715 */
2716 bzero(&ndpc, sizeof(ndpc));
2717 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2718 ndpc.rtm.rtm_version = RTM_VERSION;
2719 ndpc.rtm.rtm_type = RTM_GET;
2720 ndpc.rtm.rtm_flags = RTF_UP;
2721 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2722 ndpc.sin6.sin6_family = AF_INET6;
2723 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2724 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2725 if (V_deembed_scopeid)
2726 sa6_recoverscope(&ndpc.sin6);
2727
2728 /* publish */
2729 if (lle->la_flags & LLE_PUB)
2730 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2731
2732 sdl = &ndpc.sdl;
2733 sdl->sdl_family = AF_LINK;
2734 sdl->sdl_len = sizeof(*sdl);
2735 sdl->sdl_alen = ifp->if_addrlen;
2736 sdl->sdl_index = ifp->if_index;
2737 sdl->sdl_type = ifp->if_type;
2738 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2739 ndpc.rtm.rtm_rmx.rmx_expire =
2740 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2741 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2742 if (lle->la_flags & LLE_STATIC)
2743 ndpc.rtm.rtm_flags |= RTF_STATIC;
2744 ndpc.rtm.rtm_index = ifp->if_index;
2745 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2746 if (error)
2747 break;
2748 }
2749 }
2750 return error;
2751 }
2752
2753 void *
2754 in6_domifattach(struct ifnet *ifp)
2755 {
2756 struct in6_ifextra *ext;
2757
2758 /* There are not IPv6-capable interfaces. */
2759 switch (ifp->if_type) {
2760 case IFT_PFLOG:
2761 case IFT_PFSYNC:
2762 case IFT_USB:
2763 return (NULL);
2764 }
2765 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2766 bzero(ext, sizeof(*ext));
2767
2768 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2769 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2770 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2771 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2772
2773 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2774 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2775 M_WAITOK);
2776 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2777 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2778
2779 ext->nd_ifinfo = nd6_ifattach(ifp);
2780 ext->scope6_id = scope6_ifattach(ifp);
2781 ext->lltable = lltable_init(ifp, AF_INET6);
2782 if (ext->lltable != NULL) {
2783 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2784 ext->lltable->llt_lookup = in6_lltable_lookup;
2785 ext->lltable->llt_dump = in6_lltable_dump;
2786 }
2787
2788 ext->mld_ifinfo = mld_domifattach(ifp);
2789
2790 return ext;
2791 }
2792
2793 void
2794 in6_domifdetach(struct ifnet *ifp, void *aux)
2795 {
2796 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2797
2798 mld_domifdetach(ifp);
2799 scope6_ifdetach(ext->scope6_id);
2800 nd6_ifdetach(ext->nd_ifinfo);
2801 lltable_free(ext->lltable);
2802 COUNTER_ARRAY_FREE(ext->in6_ifstat,
2803 sizeof(struct in6_ifstat) / sizeof(uint64_t));
2804 free(ext->in6_ifstat, M_IFADDR);
2805 COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2806 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2807 free(ext->icmp6_ifstat, M_IFADDR);
2808 free(ext, M_IFADDR);
2809 }
2810
2811 /*
2812 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2813 * v4 mapped addr or v4 compat addr
2814 */
2815 void
2816 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2817 {
2818
2819 bzero(sin, sizeof(*sin));
2820 sin->sin_len = sizeof(struct sockaddr_in);
2821 sin->sin_family = AF_INET;
2822 sin->sin_port = sin6->sin6_port;
2823 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2824 }
2825
2826 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2827 void
2828 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2829 {
2830 bzero(sin6, sizeof(*sin6));
2831 sin6->sin6_len = sizeof(struct sockaddr_in6);
2832 sin6->sin6_family = AF_INET6;
2833 sin6->sin6_port = sin->sin_port;
2834 sin6->sin6_addr.s6_addr32[0] = 0;
2835 sin6->sin6_addr.s6_addr32[1] = 0;
2836 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2837 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2838 }
2839
2840 /* Convert sockaddr_in6 into sockaddr_in. */
2841 void
2842 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2843 {
2844 struct sockaddr_in *sin_p;
2845 struct sockaddr_in6 sin6;
2846
2847 /*
2848 * Save original sockaddr_in6 addr and convert it
2849 * to sockaddr_in.
2850 */
2851 sin6 = *(struct sockaddr_in6 *)nam;
2852 sin_p = (struct sockaddr_in *)nam;
2853 in6_sin6_2_sin(sin_p, &sin6);
2854 }
2855
2856 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2857 void
2858 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2859 {
2860 struct sockaddr_in *sin_p;
2861 struct sockaddr_in6 *sin6_p;
2862
2863 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2864 sin_p = (struct sockaddr_in *)*nam;
2865 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2866 free(*nam, M_SONAME);
2867 *nam = (struct sockaddr *)sin6_p;
2868 }
Cache object: e0c9660eeae568cd604c135d0ef4d06b
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