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/10.1/sys/netinet6/in6.c 271185 2014-09-06 04:39:26Z markj $");
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 IF_AFDATA_LOCK(ifp);
159 ifa->ifa_rtrequest = nd6_rtrequest;
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 /* Announce arrival of local address to all FIBs. */
187 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
188 }
189
190 void
191 in6_ifremloop(struct ifaddr *ifa)
192 {
193 struct sockaddr_dl gateway;
194 struct sockaddr_in6 mask, addr;
195 struct rtentry rt0;
196 struct in6_ifaddr *ia;
197 struct ifnet *ifp;
198
199 ia = ifa2ia6(ifa);
200 ifp = ifa->ifa_ifp;
201 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
202 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
203 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
204 (struct sockaddr *)&mask, LLE_STATIC);
205
206 /*
207 * initialize for rtmsg generation
208 */
209 bzero(&gateway, sizeof(gateway));
210 gateway.sdl_len = sizeof(gateway);
211 gateway.sdl_family = AF_LINK;
212 gateway.sdl_nlen = 0;
213 gateway.sdl_alen = ifp->if_addrlen;
214 bzero(&rt0, sizeof(rt0));
215 rt0.rt_gateway = (struct sockaddr *)&gateway;
216 rt_mask(&rt0) = (struct sockaddr *)&mask;
217 rt_key(&rt0) = (struct sockaddr *)&addr;
218 rt0.rt_flags = RTF_HOST | RTF_STATIC;
219 /* Announce removal of local address to all FIBs. */
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 carp_attached = 0;
276 int error;
277 u_long ocmd = cmd;
278
279 /*
280 * Compat to make pre-10.x ifconfig(8) operable.
281 */
282 if (cmd == OSIOCAIFADDR_IN6)
283 cmd = SIOCAIFADDR_IN6;
284
285 switch (cmd) {
286 case SIOCGETSGCNT_IN6:
287 case SIOCGETMIFCNT_IN6:
288 /*
289 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
290 * We cannot see how that would be needed, so do not adjust the
291 * KPI blindly; more likely should clean up the IPv4 variant.
292 */
293 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
294 }
295
296 switch (cmd) {
297 case SIOCAADDRCTL_POLICY:
298 case SIOCDADDRCTL_POLICY:
299 if (td != NULL) {
300 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
301 if (error)
302 return (error);
303 }
304 return (in6_src_ioctl(cmd, data));
305 }
306
307 if (ifp == NULL)
308 return (EOPNOTSUPP);
309
310 switch (cmd) {
311 case SIOCSNDFLUSH_IN6:
312 case SIOCSPFXFLUSH_IN6:
313 case SIOCSRTRFLUSH_IN6:
314 case SIOCSDEFIFACE_IN6:
315 case SIOCSIFINFO_FLAGS:
316 case SIOCSIFINFO_IN6:
317 if (td != NULL) {
318 error = priv_check(td, PRIV_NETINET_ND6);
319 if (error)
320 return (error);
321 }
322 /* FALLTHROUGH */
323 case OSIOCGIFINFO_IN6:
324 case SIOCGIFINFO_IN6:
325 case SIOCGDRLST_IN6:
326 case SIOCGPRLST_IN6:
327 case SIOCGNBRINFO_IN6:
328 case SIOCGDEFIFACE_IN6:
329 return (nd6_ioctl(cmd, data, ifp));
330
331 #ifdef COMPAT_FREEBSD32
332 case SIOCGDEFIFACE32_IN6:
333 {
334 struct in6_ndifreq ndif;
335 struct in6_ndifreq32 *ndif32;
336
337 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
338 ifp);
339 if (error)
340 return (error);
341 ndif32 = (struct in6_ndifreq32 *)data;
342 ndif32->ifindex = ndif.ifindex;
343 return (0);
344 }
345 #endif
346 }
347
348 switch (cmd) {
349 case SIOCSIFPREFIX_IN6:
350 case SIOCDIFPREFIX_IN6:
351 case SIOCAIFPREFIX_IN6:
352 case SIOCCIFPREFIX_IN6:
353 case SIOCSGIFPREFIX_IN6:
354 case SIOCGIFPREFIX_IN6:
355 log(LOG_NOTICE,
356 "prefix ioctls are now invalidated. "
357 "please use ifconfig.\n");
358 return (EOPNOTSUPP);
359 }
360
361 switch (cmd) {
362 case SIOCSSCOPE6:
363 if (td != NULL) {
364 error = priv_check(td, PRIV_NETINET_SCOPE6);
365 if (error)
366 return (error);
367 }
368 /* FALLTHROUGH */
369 case SIOCGSCOPE6:
370 case SIOCGSCOPE6DEF:
371 return (scope6_ioctl(cmd, data, ifp));
372 }
373
374 switch (cmd) {
375 case SIOCALIFADDR:
376 if (td != NULL) {
377 error = priv_check(td, PRIV_NET_ADDIFADDR);
378 if (error)
379 return (error);
380 }
381 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
382
383 case SIOCDLIFADDR:
384 if (td != NULL) {
385 error = priv_check(td, PRIV_NET_DELIFADDR);
386 if (error)
387 return (error);
388 }
389 /* FALLTHROUGH */
390 case SIOCGLIFADDR:
391 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
392 }
393
394 /*
395 * Find address for this interface, if it exists.
396 *
397 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
398 * only, and used the first interface address as the target of other
399 * operations (without checking ifra_addr). This was because netinet
400 * code/API assumed at most 1 interface address per interface.
401 * Since IPv6 allows a node to assign multiple addresses
402 * on a single interface, we almost always look and check the
403 * presence of ifra_addr, and reject invalid ones here.
404 * It also decreases duplicated code among SIOC*_IN6 operations.
405 */
406 switch (cmd) {
407 case SIOCAIFADDR_IN6:
408 case SIOCSIFPHYADDR_IN6:
409 sa6 = &ifra->ifra_addr;
410 break;
411 case SIOCSIFADDR_IN6:
412 case SIOCGIFADDR_IN6:
413 case SIOCSIFDSTADDR_IN6:
414 case SIOCSIFNETMASK_IN6:
415 case SIOCGIFDSTADDR_IN6:
416 case SIOCGIFNETMASK_IN6:
417 case SIOCDIFADDR_IN6:
418 case SIOCGIFPSRCADDR_IN6:
419 case SIOCGIFPDSTADDR_IN6:
420 case SIOCGIFAFLAG_IN6:
421 case SIOCSNDFLUSH_IN6:
422 case SIOCSPFXFLUSH_IN6:
423 case SIOCSRTRFLUSH_IN6:
424 case SIOCGIFALIFETIME_IN6:
425 case SIOCSIFALIFETIME_IN6:
426 case SIOCGIFSTAT_IN6:
427 case SIOCGIFSTAT_ICMP6:
428 sa6 = &ifr->ifr_addr;
429 break;
430 case SIOCSIFADDR:
431 case SIOCSIFBRDADDR:
432 case SIOCSIFDSTADDR:
433 case SIOCSIFNETMASK:
434 /*
435 * Although we should pass any non-INET6 ioctl requests
436 * down to driver, we filter some legacy INET requests.
437 * Drivers trust SIOCSIFADDR et al to come from an already
438 * privileged layer, and do not perform any credentials
439 * checks or input validation.
440 */
441 return (EINVAL);
442 default:
443 sa6 = NULL;
444 break;
445 }
446 if (sa6 && sa6->sin6_family == AF_INET6) {
447 if (sa6->sin6_scope_id != 0)
448 error = sa6_embedscope(sa6, 0);
449 else
450 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
451 if (error != 0)
452 return (error);
453 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
454 &sa6->sin6_addr)) != 0)
455 return (error);
456 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
457 } else
458 ia = NULL;
459
460 switch (cmd) {
461 case SIOCSIFADDR_IN6:
462 case SIOCSIFDSTADDR_IN6:
463 case SIOCSIFNETMASK_IN6:
464 /*
465 * Since IPv6 allows a node to assign multiple addresses
466 * on a single interface, SIOCSIFxxx ioctls are deprecated.
467 */
468 /* we decided to obsolete this command (20000704) */
469 error = EINVAL;
470 goto out;
471
472 case SIOCDIFADDR_IN6:
473 /*
474 * for IPv4, we look for existing in_ifaddr here to allow
475 * "ifconfig if0 delete" to remove the first IPv4 address on
476 * the interface. For IPv6, as the spec allows multiple
477 * interface address from the day one, we consider "remove the
478 * first one" semantics to be not preferable.
479 */
480 if (ia == NULL) {
481 error = EADDRNOTAVAIL;
482 goto out;
483 }
484 /* FALLTHROUGH */
485 case SIOCAIFADDR_IN6:
486 /*
487 * We always require users to specify a valid IPv6 address for
488 * the corresponding operation.
489 */
490 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
491 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
492 error = EAFNOSUPPORT;
493 goto out;
494 }
495
496 if (td != NULL) {
497 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
498 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
499 if (error)
500 goto out;
501 }
502 /* FALLTHROUGH */
503 case SIOCGIFSTAT_IN6:
504 case SIOCGIFSTAT_ICMP6:
505 if (ifp->if_afdata[AF_INET6] == NULL) {
506 error = EPFNOSUPPORT;
507 goto out;
508 }
509 break;
510
511 case SIOCGIFADDR_IN6:
512 /* This interface is basically deprecated. use SIOCGIFCONF. */
513 /* FALLTHROUGH */
514 case SIOCGIFAFLAG_IN6:
515 case SIOCGIFNETMASK_IN6:
516 case SIOCGIFDSTADDR_IN6:
517 case SIOCGIFALIFETIME_IN6:
518 /* must think again about its semantics */
519 if (ia == NULL) {
520 error = EADDRNOTAVAIL;
521 goto out;
522 }
523 break;
524
525 case SIOCSIFALIFETIME_IN6:
526 {
527 struct in6_addrlifetime *lt;
528
529 if (td != NULL) {
530 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
531 if (error)
532 goto out;
533 }
534 if (ia == NULL) {
535 error = EADDRNOTAVAIL;
536 goto out;
537 }
538 /* sanity for overflow - beware unsigned */
539 lt = &ifr->ifr_ifru.ifru_lifetime;
540 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
541 lt->ia6t_vltime + time_uptime < time_uptime) {
542 error = EINVAL;
543 goto out;
544 }
545 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
546 lt->ia6t_pltime + time_uptime < time_uptime) {
547 error = EINVAL;
548 goto out;
549 }
550 break;
551 }
552 }
553
554 switch (cmd) {
555 case SIOCGIFADDR_IN6:
556 ifr->ifr_addr = ia->ia_addr;
557 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
558 goto out;
559 break;
560
561 case SIOCGIFDSTADDR_IN6:
562 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
563 error = EINVAL;
564 goto out;
565 }
566 /*
567 * XXX: should we check if ifa_dstaddr is NULL and return
568 * an error?
569 */
570 ifr->ifr_dstaddr = ia->ia_dstaddr;
571 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
572 goto out;
573 break;
574
575 case SIOCGIFNETMASK_IN6:
576 ifr->ifr_addr = ia->ia_prefixmask;
577 break;
578
579 case SIOCGIFAFLAG_IN6:
580 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
581 break;
582
583 case SIOCGIFSTAT_IN6:
584 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
585 ifp->if_afdata[AF_INET6])->in6_ifstat,
586 &ifr->ifr_ifru.ifru_stat,
587 sizeof(struct in6_ifstat) / sizeof(uint64_t));
588 break;
589
590 case SIOCGIFSTAT_ICMP6:
591 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
592 ifp->if_afdata[AF_INET6])->icmp6_ifstat,
593 &ifr->ifr_ifru.ifru_icmp6stat,
594 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
595 break;
596
597 case SIOCGIFALIFETIME_IN6:
598 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
599 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
600 time_t maxexpire;
601 struct in6_addrlifetime *retlt =
602 &ifr->ifr_ifru.ifru_lifetime;
603
604 /*
605 * XXX: adjust expiration time assuming time_t is
606 * signed.
607 */
608 maxexpire = (-1) &
609 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
610 if (ia->ia6_lifetime.ia6t_vltime <
611 maxexpire - ia->ia6_updatetime) {
612 retlt->ia6t_expire = ia->ia6_updatetime +
613 ia->ia6_lifetime.ia6t_vltime;
614 } else
615 retlt->ia6t_expire = maxexpire;
616 }
617 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
618 time_t maxexpire;
619 struct in6_addrlifetime *retlt =
620 &ifr->ifr_ifru.ifru_lifetime;
621
622 /*
623 * XXX: adjust expiration time assuming time_t is
624 * signed.
625 */
626 maxexpire = (-1) &
627 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
628 if (ia->ia6_lifetime.ia6t_pltime <
629 maxexpire - ia->ia6_updatetime) {
630 retlt->ia6t_preferred = ia->ia6_updatetime +
631 ia->ia6_lifetime.ia6t_pltime;
632 } else
633 retlt->ia6t_preferred = maxexpire;
634 }
635 break;
636
637 case SIOCSIFALIFETIME_IN6:
638 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
639 /* for sanity */
640 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
641 ia->ia6_lifetime.ia6t_expire =
642 time_uptime + ia->ia6_lifetime.ia6t_vltime;
643 } else
644 ia->ia6_lifetime.ia6t_expire = 0;
645 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
646 ia->ia6_lifetime.ia6t_preferred =
647 time_uptime + ia->ia6_lifetime.ia6t_pltime;
648 } else
649 ia->ia6_lifetime.ia6t_preferred = 0;
650 break;
651
652 case SIOCAIFADDR_IN6:
653 {
654 int i;
655 struct nd_prefixctl pr0;
656 struct nd_prefix *pr;
657
658 /*
659 * first, make or update the interface address structure,
660 * and link it to the list.
661 */
662 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
663 goto out;
664 if (ia != NULL)
665 ifa_free(&ia->ia_ifa);
666 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
667 == NULL) {
668 /*
669 * this can happen when the user specify the 0 valid
670 * lifetime.
671 */
672 break;
673 }
674
675 if (cmd == ocmd && ifra->ifra_vhid > 0) {
676 if (carp_attach_p != NULL)
677 error = (*carp_attach_p)(&ia->ia_ifa,
678 ifra->ifra_vhid);
679 else
680 error = EPROTONOSUPPORT;
681 if (error)
682 goto out;
683 else
684 carp_attached = 1;
685 }
686
687 /*
688 * then, make the prefix on-link on the interface.
689 * XXX: we'd rather create the prefix before the address, but
690 * we need at least one address to install the corresponding
691 * interface route, so we configure the address first.
692 */
693
694 /*
695 * convert mask to prefix length (prefixmask has already
696 * been validated in in6_update_ifa().
697 */
698 bzero(&pr0, sizeof(pr0));
699 pr0.ndpr_ifp = ifp;
700 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
701 NULL);
702 if (pr0.ndpr_plen == 128) {
703 break; /* we don't need to install a host route. */
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 if (error == 0 && ia) {
772 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
773 /*
774 * Try to clear the flag when a new
775 * IPv6 address is added onto an
776 * IFDISABLED interface and it
777 * succeeds.
778 */
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,
785 (caddr_t)&nd, ifp) < 0)
786 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
787 "SIOCSIFINFO_FLAGS for -ifdisabled "
788 "failed.");
789 /*
790 * Ignore failure of clearing the flag
791 * intentionally. The failure means
792 * address duplication was detected.
793 */
794 }
795 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
796 }
797 break;
798 }
799
800 case SIOCDIFADDR_IN6:
801 {
802 struct nd_prefix *pr;
803
804 /*
805 * If the address being deleted is the only one that owns
806 * the corresponding prefix, expire the prefix as well.
807 * XXX: theoretically, we don't have to worry about such
808 * relationship, since we separate the address management
809 * and the prefix management. We do this, however, to provide
810 * as much backward compatibility as possible in terms of
811 * the ioctl operation.
812 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
813 */
814 pr = ia->ia6_ndpr;
815 in6_purgeaddr(&ia->ia_ifa);
816 if (pr && pr->ndpr_refcnt == 0)
817 prelist_remove(pr);
818 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
819 break;
820 }
821
822 default:
823 if (ifp->if_ioctl == NULL) {
824 error = EOPNOTSUPP;
825 goto out;
826 }
827 error = (*ifp->if_ioctl)(ifp, cmd, data);
828 goto out;
829 }
830
831 error = 0;
832 out:
833 if (ia != NULL)
834 ifa_free(&ia->ia_ifa);
835 return (error);
836 }
837
838
839 /*
840 * Join necessary multicast groups. Factored out from in6_update_ifa().
841 * This entire work should only be done once, for the default FIB.
842 */
843 static int
844 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
845 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
846 {
847 char ip6buf[INET6_ADDRSTRLEN];
848 struct sockaddr_in6 mltaddr, mltmask;
849 struct in6_addr llsol;
850 struct in6_multi_mship *imm;
851 struct rtentry *rt;
852 int delay, error;
853
854 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
855
856 /* Join solicited multicast addr for new host id. */
857 bzero(&llsol, sizeof(struct in6_addr));
858 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
859 llsol.s6_addr32[1] = 0;
860 llsol.s6_addr32[2] = htonl(1);
861 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
862 llsol.s6_addr8[12] = 0xff;
863 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
864 /* XXX: should not happen */
865 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
866 goto cleanup;
867 }
868 delay = 0;
869 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
870 /*
871 * We need a random delay for DAD on the address being
872 * configured. It also means delaying transmission of the
873 * corresponding MLD report to avoid report collision.
874 * [RFC 4861, Section 6.3.7]
875 */
876 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
877 }
878 imm = in6_joingroup(ifp, &llsol, &error, delay);
879 if (imm == NULL) {
880 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
881 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
882 if_name(ifp), error));
883 goto cleanup;
884 }
885 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
886 *in6m_sol = imm->i6mm_maddr;
887
888 bzero(&mltmask, sizeof(mltmask));
889 mltmask.sin6_len = sizeof(struct sockaddr_in6);
890 mltmask.sin6_family = AF_INET6;
891 mltmask.sin6_addr = in6mask32;
892 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
893
894 /*
895 * Join link-local all-nodes address.
896 */
897 bzero(&mltaddr, sizeof(mltaddr));
898 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
899 mltaddr.sin6_family = AF_INET6;
900 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
901 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
902 goto cleanup; /* XXX: should not fail */
903
904 /*
905 * XXX: do we really need this automatic routes? We should probably
906 * reconsider this stuff. Most applications actually do not need the
907 * routes, since they usually specify the outgoing interface.
908 */
909 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
910 if (rt != NULL) {
911 /* XXX: only works in !SCOPEDROUTING case. */
912 if (memcmp(&mltaddr.sin6_addr,
913 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
914 MLTMASK_LEN)) {
915 RTFREE_LOCKED(rt);
916 rt = NULL;
917 }
918 }
919 if (rt == NULL) {
920 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
921 (struct sockaddr *)&ia->ia_addr,
922 (struct sockaddr *)&mltmask, RTF_UP,
923 (struct rtentry **)0, RT_DEFAULT_FIB);
924 if (error)
925 goto cleanup;
926 } else
927 RTFREE_LOCKED(rt);
928
929 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
930 if (imm == NULL) {
931 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
932 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
933 &mltaddr.sin6_addr), if_name(ifp), error));
934 goto cleanup;
935 }
936 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
937
938 /*
939 * Join node information group address.
940 */
941 delay = 0;
942 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
943 /*
944 * The spec does not say anything about delay for this group,
945 * but the same logic should apply.
946 */
947 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
948 }
949 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
950 /* XXX jinmei */
951 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
952 if (imm == NULL)
953 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
954 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
955 &mltaddr.sin6_addr), if_name(ifp), error));
956 /* XXX not very fatal, go on... */
957 else
958 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
959 }
960 if (V_icmp6_nodeinfo_oldmcprefix &&
961 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
962 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
963 if (imm == NULL)
964 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
965 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
966 &mltaddr.sin6_addr), if_name(ifp), error));
967 /* XXX not very fatal, go on... */
968 else
969 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
970 }
971
972 /*
973 * Join interface-local all-nodes address.
974 * (ff01::1%ifN, and ff01::%ifN/32)
975 */
976 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
977 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
978 goto cleanup; /* XXX: should not fail */
979 /* XXX: again, do we really need the route? */
980 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
981 if (rt != NULL) {
982 if (memcmp(&mltaddr.sin6_addr,
983 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
984 MLTMASK_LEN)) {
985 RTFREE_LOCKED(rt);
986 rt = NULL;
987 }
988 }
989 if (rt == NULL) {
990 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
991 (struct sockaddr *)&ia->ia_addr,
992 (struct sockaddr *)&mltmask, RTF_UP,
993 (struct rtentry **)0, RT_DEFAULT_FIB);
994 if (error)
995 goto cleanup;
996 } else
997 RTFREE_LOCKED(rt);
998
999 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1000 if (imm == NULL) {
1001 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
1002 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
1003 &mltaddr.sin6_addr), if_name(ifp), error));
1004 goto cleanup;
1005 }
1006 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1007 #undef MLTMASK_LEN
1008
1009 cleanup:
1010 return (error);
1011 }
1012
1013 /*
1014 * Update parameters of an IPv6 interface address.
1015 * If necessary, a new entry is created and linked into address chains.
1016 * This function is separated from in6_control().
1017 */
1018 int
1019 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1020 struct in6_ifaddr *ia, int flags)
1021 {
1022 int error = 0, hostIsNew = 0, plen = -1;
1023 struct sockaddr_in6 dst6;
1024 struct in6_addrlifetime *lt;
1025 struct in6_multi *in6m_sol;
1026 int delay;
1027 char ip6buf[INET6_ADDRSTRLEN];
1028
1029 /* Validate parameters */
1030 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1031 return (EINVAL);
1032
1033 /*
1034 * The destination address for a p2p link must have a family
1035 * of AF_UNSPEC or AF_INET6.
1036 */
1037 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1038 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1039 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1040 return (EAFNOSUPPORT);
1041 /*
1042 * validate ifra_prefixmask. don't check sin6_family, netmask
1043 * does not carry fields other than sin6_len.
1044 */
1045 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1046 return (EINVAL);
1047 /*
1048 * Because the IPv6 address architecture is classless, we require
1049 * users to specify a (non 0) prefix length (mask) for a new address.
1050 * We also require the prefix (when specified) mask is valid, and thus
1051 * reject a non-consecutive mask.
1052 */
1053 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1054 return (EINVAL);
1055 if (ifra->ifra_prefixmask.sin6_len != 0) {
1056 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1057 (u_char *)&ifra->ifra_prefixmask +
1058 ifra->ifra_prefixmask.sin6_len);
1059 if (plen <= 0)
1060 return (EINVAL);
1061 } else {
1062 /*
1063 * In this case, ia must not be NULL. We just use its prefix
1064 * length.
1065 */
1066 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1067 }
1068 /*
1069 * If the destination address on a p2p interface is specified,
1070 * and the address is a scoped one, validate/set the scope
1071 * zone identifier.
1072 */
1073 dst6 = ifra->ifra_dstaddr;
1074 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1075 (dst6.sin6_family == AF_INET6)) {
1076 struct in6_addr in6_tmp;
1077 u_int32_t zoneid;
1078
1079 in6_tmp = dst6.sin6_addr;
1080 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1081 return (EINVAL); /* XXX: should be impossible */
1082
1083 if (dst6.sin6_scope_id != 0) {
1084 if (dst6.sin6_scope_id != zoneid)
1085 return (EINVAL);
1086 } else /* user omit to specify the ID. */
1087 dst6.sin6_scope_id = zoneid;
1088
1089 /* convert into the internal form */
1090 if (sa6_embedscope(&dst6, 0))
1091 return (EINVAL); /* XXX: should be impossible */
1092 }
1093 /*
1094 * The destination address can be specified only for a p2p or a
1095 * loopback interface. If specified, the corresponding prefix length
1096 * must be 128.
1097 */
1098 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1099 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1100 /* XXX: noisy message */
1101 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1102 "be specified for a p2p or a loopback IF only\n"));
1103 return (EINVAL);
1104 }
1105 if (plen != 128) {
1106 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1107 "be 128 when dstaddr is specified\n"));
1108 return (EINVAL);
1109 }
1110 }
1111 /* lifetime consistency check */
1112 lt = &ifra->ifra_lifetime;
1113 if (lt->ia6t_pltime > lt->ia6t_vltime)
1114 return (EINVAL);
1115 if (lt->ia6t_vltime == 0) {
1116 /*
1117 * the following log might be noisy, but this is a typical
1118 * configuration mistake or a tool's bug.
1119 */
1120 nd6log((LOG_INFO,
1121 "in6_update_ifa: valid lifetime is 0 for %s\n",
1122 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1123
1124 if (ia == NULL)
1125 return (0); /* there's nothing to do */
1126 }
1127
1128 /*
1129 * If this is a new address, allocate a new ifaddr and link it
1130 * into chains.
1131 */
1132 if (ia == NULL) {
1133 hostIsNew = 1;
1134 /*
1135 * When in6_update_ifa() is called in a process of a received
1136 * RA, it is called under an interrupt context. So, we should
1137 * call malloc with M_NOWAIT.
1138 */
1139 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1140 M_NOWAIT);
1141 if (ia == NULL)
1142 return (ENOBUFS);
1143 bzero((caddr_t)ia, sizeof(*ia));
1144 ifa_init(&ia->ia_ifa);
1145 LIST_INIT(&ia->ia6_memberships);
1146 /* Initialize the address and masks, and put time stamp */
1147 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1148 ia->ia_addr.sin6_family = AF_INET6;
1149 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1150 ia->ia6_createtime = time_uptime;
1151 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1152 /*
1153 * XXX: some functions expect that ifa_dstaddr is not
1154 * NULL for p2p interfaces.
1155 */
1156 ia->ia_ifa.ifa_dstaddr =
1157 (struct sockaddr *)&ia->ia_dstaddr;
1158 } else {
1159 ia->ia_ifa.ifa_dstaddr = NULL;
1160 }
1161 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1162 ia->ia_ifp = ifp;
1163 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1164 IF_ADDR_WLOCK(ifp);
1165 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1166 IF_ADDR_WUNLOCK(ifp);
1167
1168 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1169 IN6_IFADDR_WLOCK();
1170 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1171 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr),
1172 ia, ia6_hash);
1173 IN6_IFADDR_WUNLOCK();
1174 }
1175
1176 /* update timestamp */
1177 ia->ia6_updatetime = time_uptime;
1178
1179 /* set prefix mask */
1180 if (ifra->ifra_prefixmask.sin6_len) {
1181 /*
1182 * We prohibit changing the prefix length of an existing
1183 * address, because
1184 * + such an operation should be rare in IPv6, and
1185 * + the operation would confuse prefix management.
1186 */
1187 if (ia->ia_prefixmask.sin6_len &&
1188 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1189 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1190 " existing (%s) address should not be changed\n",
1191 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1192 error = EINVAL;
1193 goto unlink;
1194 }
1195 ia->ia_prefixmask = ifra->ifra_prefixmask;
1196 ia->ia_prefixmask.sin6_family = AF_INET6;
1197 }
1198
1199 /*
1200 * If a new destination address is specified, scrub the old one and
1201 * install the new destination. Note that the interface must be
1202 * p2p or loopback (see the check above.)
1203 */
1204 if (dst6.sin6_family == AF_INET6 &&
1205 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1206 int e;
1207
1208 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1209 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1210 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1211 "a route to the old destination: %s\n",
1212 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1213 /* proceed anyway... */
1214 } else
1215 ia->ia_flags &= ~IFA_ROUTE;
1216 ia->ia_dstaddr = dst6;
1217 }
1218
1219 /*
1220 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1221 * to see if the address is deprecated or invalidated, but initialize
1222 * these members for applications.
1223 */
1224 ia->ia6_lifetime = ifra->ifra_lifetime;
1225 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1226 ia->ia6_lifetime.ia6t_expire =
1227 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1228 } else
1229 ia->ia6_lifetime.ia6t_expire = 0;
1230 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1231 ia->ia6_lifetime.ia6t_preferred =
1232 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1233 } else
1234 ia->ia6_lifetime.ia6t_preferred = 0;
1235
1236 /* reset the interface and routing table appropriately. */
1237 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1238 goto unlink;
1239
1240 /*
1241 * configure address flags.
1242 */
1243 ia->ia6_flags = ifra->ifra_flags;
1244 /*
1245 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1246 * userland, make it deprecated.
1247 */
1248 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1249 ia->ia6_lifetime.ia6t_pltime = 0;
1250 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1251 }
1252 /*
1253 * Make the address tentative before joining multicast addresses,
1254 * so that corresponding MLD responses would not have a tentative
1255 * source address.
1256 */
1257 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1258 if (hostIsNew && in6if_do_dad(ifp))
1259 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1260
1261 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1262 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1263 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1264
1265 /*
1266 * We are done if we have simply modified an existing address.
1267 */
1268 if (!hostIsNew)
1269 return (error);
1270
1271 /*
1272 * Beyond this point, we should call in6_purgeaddr upon an error,
1273 * not just go to unlink.
1274 */
1275
1276 /* Join necessary multicast groups. */
1277 in6m_sol = NULL;
1278 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1279 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1280 if (error)
1281 goto cleanup;
1282 }
1283
1284 /*
1285 * Perform DAD, if needed.
1286 * XXX It may be of use, if we can administratively disable DAD.
1287 */
1288 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1289 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1290 {
1291 int mindelay, maxdelay;
1292
1293 delay = 0;
1294 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1295 /*
1296 * We need to impose a delay before sending an NS
1297 * for DAD. Check if we also needed a delay for the
1298 * corresponding MLD message. If we did, the delay
1299 * should be larger than the MLD delay (this could be
1300 * relaxed a bit, but this simple logic is at least
1301 * safe).
1302 * XXX: Break data hiding guidelines and look at
1303 * state for the solicited multicast group.
1304 */
1305 mindelay = 0;
1306 if (in6m_sol != NULL &&
1307 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1308 mindelay = in6m_sol->in6m_timer;
1309 }
1310 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1311 if (maxdelay - mindelay == 0)
1312 delay = 0;
1313 else {
1314 delay =
1315 (arc4random() % (maxdelay - mindelay)) +
1316 mindelay;
1317 }
1318 }
1319 nd6_dad_start((struct ifaddr *)ia, delay);
1320 }
1321
1322 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1323 ifa_free(&ia->ia_ifa);
1324 return (error);
1325
1326 unlink:
1327 /*
1328 * XXX: if a change of an existing address failed, keep the entry
1329 * anyway.
1330 */
1331 if (hostIsNew) {
1332 in6_unlink_ifa(ia, ifp);
1333 ifa_free(&ia->ia_ifa);
1334 }
1335 return (error);
1336
1337 cleanup:
1338 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1339 ifa_free(&ia->ia_ifa);
1340 in6_purgeaddr(&ia->ia_ifa);
1341 return error;
1342 }
1343
1344 /*
1345 * Leave multicast groups. Factored out from in6_purgeaddr().
1346 * This entire work should only be done once, for the default FIB.
1347 */
1348 static int
1349 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1350 {
1351 struct sockaddr_in6 mltaddr, mltmask;
1352 struct in6_multi_mship *imm;
1353 struct rtentry *rt;
1354 struct sockaddr_in6 sin6;
1355 int error;
1356
1357 /*
1358 * Leave from multicast groups we have joined for the interface.
1359 */
1360 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1361 LIST_REMOVE(imm, i6mm_chain);
1362 in6_leavegroup(imm);
1363 }
1364
1365 /*
1366 * Remove the link-local all-nodes address.
1367 */
1368 bzero(&mltmask, sizeof(mltmask));
1369 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1370 mltmask.sin6_family = AF_INET6;
1371 mltmask.sin6_addr = in6mask32;
1372
1373 bzero(&mltaddr, sizeof(mltaddr));
1374 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1375 mltaddr.sin6_family = AF_INET6;
1376 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1377
1378 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1379 return (error);
1380
1381 /*
1382 * As for the mltaddr above, proactively prepare the sin6 to avoid
1383 * rtentry un- and re-locking.
1384 */
1385 if (ifa0 != NULL) {
1386 bzero(&sin6, sizeof(sin6));
1387 sin6.sin6_len = sizeof(sin6);
1388 sin6.sin6_family = AF_INET6;
1389 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1390 sizeof(sin6.sin6_addr));
1391 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1392 if (error != 0)
1393 return (error);
1394 }
1395
1396 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1397 if (rt != NULL && rt->rt_gateway != NULL &&
1398 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1399 &ia->ia_addr.sin6_addr,
1400 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1401 /*
1402 * If no more IPv6 address exists on this interface then
1403 * remove the multicast address route.
1404 */
1405 if (ifa0 == NULL) {
1406 memcpy(&mltaddr.sin6_addr,
1407 &satosin6(rt_key(rt))->sin6_addr,
1408 sizeof(mltaddr.sin6_addr));
1409 RTFREE_LOCKED(rt);
1410 error = in6_rtrequest(RTM_DELETE,
1411 (struct sockaddr *)&mltaddr,
1412 (struct sockaddr *)&ia->ia_addr,
1413 (struct sockaddr *)&mltmask, RTF_UP,
1414 (struct rtentry **)0, RT_DEFAULT_FIB);
1415 if (error)
1416 log(LOG_INFO, "%s: link-local all-nodes "
1417 "multicast address deletion error\n",
1418 __func__);
1419 } else {
1420 /*
1421 * Replace the gateway of the route.
1422 */
1423 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1424 RTFREE_LOCKED(rt);
1425 }
1426 } else {
1427 if (rt != NULL)
1428 RTFREE_LOCKED(rt);
1429 }
1430
1431 /*
1432 * Remove the node-local all-nodes address.
1433 */
1434 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1435 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1436 return (error);
1437
1438 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1439 if (rt != NULL && rt->rt_gateway != NULL &&
1440 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1441 &ia->ia_addr.sin6_addr,
1442 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1443 /*
1444 * If no more IPv6 address exists on this interface then
1445 * remove the multicast address route.
1446 */
1447 if (ifa0 == NULL) {
1448 memcpy(&mltaddr.sin6_addr,
1449 &satosin6(rt_key(rt))->sin6_addr,
1450 sizeof(mltaddr.sin6_addr));
1451
1452 RTFREE_LOCKED(rt);
1453 error = in6_rtrequest(RTM_DELETE,
1454 (struct sockaddr *)&mltaddr,
1455 (struct sockaddr *)&ia->ia_addr,
1456 (struct sockaddr *)&mltmask, RTF_UP,
1457 (struct rtentry **)0, RT_DEFAULT_FIB);
1458 if (error)
1459 log(LOG_INFO, "%s: node-local all-nodes"
1460 "multicast address deletion error\n",
1461 __func__);
1462 } else {
1463 /*
1464 * Replace the gateway of the route.
1465 */
1466 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1467 RTFREE_LOCKED(rt);
1468 }
1469 } else {
1470 if (rt != NULL)
1471 RTFREE_LOCKED(rt);
1472 }
1473
1474 return (0);
1475 }
1476
1477 void
1478 in6_purgeaddr(struct ifaddr *ifa)
1479 {
1480 struct ifnet *ifp = ifa->ifa_ifp;
1481 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1482 int plen, error;
1483 struct ifaddr *ifa0;
1484
1485 if (ifa->ifa_carp)
1486 (*carp_detach_p)(ifa);
1487
1488 /*
1489 * find another IPv6 address as the gateway for the
1490 * link-local and node-local all-nodes multicast
1491 * address routes
1492 */
1493 IF_ADDR_RLOCK(ifp);
1494 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1495 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1496 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1497 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1498 continue;
1499 else
1500 break;
1501 }
1502 if (ifa0 != NULL)
1503 ifa_ref(ifa0);
1504 IF_ADDR_RUNLOCK(ifp);
1505
1506 /*
1507 * Remove the loopback route to the interface address.
1508 * The check for the current setting of "nd6_useloopback"
1509 * is not needed.
1510 */
1511 if (ia->ia_flags & IFA_RTSELF) {
1512 error = ifa_del_loopback_route((struct ifaddr *)ia,
1513 (struct sockaddr *)&ia->ia_addr);
1514 if (error == 0)
1515 ia->ia_flags &= ~IFA_RTSELF;
1516 }
1517
1518 /* stop DAD processing */
1519 nd6_dad_stop(ifa);
1520
1521 /* Remove local address entry from lltable. */
1522 in6_ifremloop(ifa);
1523
1524 /* Leave multicast groups. */
1525 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1526
1527 if (ifa0 != NULL)
1528 ifa_free(ifa0);
1529
1530 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1531 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1532 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1533 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1534 if (error != 0)
1535 log(LOG_INFO, "%s: err=%d, destination address delete "
1536 "failed\n", __func__, error);
1537 ia->ia_flags &= ~IFA_ROUTE;
1538 }
1539
1540 in6_unlink_ifa(ia, ifp);
1541 }
1542
1543 static void
1544 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1545 {
1546
1547 IF_ADDR_WLOCK(ifp);
1548 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1549 IF_ADDR_WUNLOCK(ifp);
1550 ifa_free(&ia->ia_ifa); /* if_addrhead */
1551
1552 /*
1553 * Defer the release of what might be the last reference to the
1554 * in6_ifaddr so that it can't be freed before the remainder of the
1555 * cleanup.
1556 */
1557 IN6_IFADDR_WLOCK();
1558 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1559 LIST_REMOVE(ia, ia6_hash);
1560 IN6_IFADDR_WUNLOCK();
1561
1562 /*
1563 * Release the reference to the base prefix. There should be a
1564 * positive reference.
1565 */
1566 if (ia->ia6_ndpr == NULL) {
1567 nd6log((LOG_NOTICE,
1568 "in6_unlink_ifa: autoconf'ed address "
1569 "%p has no prefix\n", ia));
1570 } else {
1571 ia->ia6_ndpr->ndpr_refcnt--;
1572 ia->ia6_ndpr = NULL;
1573 }
1574
1575 /*
1576 * Also, if the address being removed is autoconf'ed, call
1577 * pfxlist_onlink_check() since the release might affect the status of
1578 * other (detached) addresses.
1579 */
1580 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1581 pfxlist_onlink_check();
1582 }
1583 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1584 }
1585
1586 void
1587 in6_purgeif(struct ifnet *ifp)
1588 {
1589 struct ifaddr *ifa, *nifa;
1590
1591 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1592 if (ifa->ifa_addr->sa_family != AF_INET6)
1593 continue;
1594 in6_purgeaddr(ifa);
1595 }
1596
1597 in6_ifdetach(ifp);
1598 }
1599
1600 /*
1601 * SIOC[GAD]LIFADDR.
1602 * SIOCGLIFADDR: get first address. (?)
1603 * SIOCGLIFADDR with IFLR_PREFIX:
1604 * get first address that matches the specified prefix.
1605 * SIOCALIFADDR: add the specified address.
1606 * SIOCALIFADDR with IFLR_PREFIX:
1607 * add the specified prefix, filling hostid part from
1608 * the first link-local address. prefixlen must be <= 64.
1609 * SIOCDLIFADDR: delete the specified address.
1610 * SIOCDLIFADDR with IFLR_PREFIX:
1611 * delete the first address that matches the specified prefix.
1612 * return values:
1613 * EINVAL on invalid parameters
1614 * EADDRNOTAVAIL on prefix match failed/specified address not found
1615 * other values may be returned from in6_ioctl()
1616 *
1617 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1618 * this is to accomodate address naming scheme other than RFC2374,
1619 * in the future.
1620 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1621 * address encoding scheme. (see figure on page 8)
1622 */
1623 static int
1624 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1625 struct ifnet *ifp, struct thread *td)
1626 {
1627 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1628 struct ifaddr *ifa;
1629 struct sockaddr *sa;
1630
1631 /* sanity checks */
1632 if (!data || !ifp) {
1633 panic("invalid argument to in6_lifaddr_ioctl");
1634 /* NOTREACHED */
1635 }
1636
1637 switch (cmd) {
1638 case SIOCGLIFADDR:
1639 /* address must be specified on GET with IFLR_PREFIX */
1640 if ((iflr->flags & IFLR_PREFIX) == 0)
1641 break;
1642 /* FALLTHROUGH */
1643 case SIOCALIFADDR:
1644 case SIOCDLIFADDR:
1645 /* address must be specified on ADD and DELETE */
1646 sa = (struct sockaddr *)&iflr->addr;
1647 if (sa->sa_family != AF_INET6)
1648 return EINVAL;
1649 if (sa->sa_len != sizeof(struct sockaddr_in6))
1650 return EINVAL;
1651 /* XXX need improvement */
1652 sa = (struct sockaddr *)&iflr->dstaddr;
1653 if (sa->sa_family && sa->sa_family != AF_INET6)
1654 return EINVAL;
1655 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1656 return EINVAL;
1657 break;
1658 default: /* shouldn't happen */
1659 #if 0
1660 panic("invalid cmd to in6_lifaddr_ioctl");
1661 /* NOTREACHED */
1662 #else
1663 return EOPNOTSUPP;
1664 #endif
1665 }
1666 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1667 return EINVAL;
1668
1669 switch (cmd) {
1670 case SIOCALIFADDR:
1671 {
1672 struct in6_aliasreq ifra;
1673 struct in6_addr *hostid = NULL;
1674 int prefixlen;
1675
1676 ifa = NULL;
1677 if ((iflr->flags & IFLR_PREFIX) != 0) {
1678 struct sockaddr_in6 *sin6;
1679
1680 /*
1681 * hostid is to fill in the hostid part of the
1682 * address. hostid points to the first link-local
1683 * address attached to the interface.
1684 */
1685 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1686 if (!ifa)
1687 return EADDRNOTAVAIL;
1688 hostid = IFA_IN6(ifa);
1689
1690 /* prefixlen must be <= 64. */
1691 if (64 < iflr->prefixlen) {
1692 if (ifa != NULL)
1693 ifa_free(ifa);
1694 return EINVAL;
1695 }
1696 prefixlen = iflr->prefixlen;
1697
1698 /* hostid part must be zero. */
1699 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1700 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1701 sin6->sin6_addr.s6_addr32[3] != 0) {
1702 if (ifa != NULL)
1703 ifa_free(ifa);
1704 return EINVAL;
1705 }
1706 } else
1707 prefixlen = iflr->prefixlen;
1708
1709 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1710 bzero(&ifra, sizeof(ifra));
1711 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1712
1713 bcopy(&iflr->addr, &ifra.ifra_addr,
1714 ((struct sockaddr *)&iflr->addr)->sa_len);
1715 if (hostid) {
1716 /* fill in hostid part */
1717 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1718 hostid->s6_addr32[2];
1719 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1720 hostid->s6_addr32[3];
1721 }
1722
1723 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1724 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1725 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1726 if (hostid) {
1727 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1728 hostid->s6_addr32[2];
1729 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1730 hostid->s6_addr32[3];
1731 }
1732 }
1733 if (ifa != NULL)
1734 ifa_free(ifa);
1735
1736 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1737 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1738
1739 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1740 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1741 }
1742 case SIOCGLIFADDR:
1743 case SIOCDLIFADDR:
1744 {
1745 struct in6_ifaddr *ia;
1746 struct in6_addr mask, candidate, match;
1747 struct sockaddr_in6 *sin6;
1748 int cmp;
1749
1750 bzero(&mask, sizeof(mask));
1751 if (iflr->flags & IFLR_PREFIX) {
1752 /* lookup a prefix rather than address. */
1753 in6_prefixlen2mask(&mask, iflr->prefixlen);
1754
1755 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1756 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1757 match.s6_addr32[0] &= mask.s6_addr32[0];
1758 match.s6_addr32[1] &= mask.s6_addr32[1];
1759 match.s6_addr32[2] &= mask.s6_addr32[2];
1760 match.s6_addr32[3] &= mask.s6_addr32[3];
1761
1762 /* if you set extra bits, that's wrong */
1763 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1764 return EINVAL;
1765
1766 cmp = 1;
1767 } else {
1768 if (cmd == SIOCGLIFADDR) {
1769 /* on getting an address, take the 1st match */
1770 cmp = 0; /* XXX */
1771 } else {
1772 /* on deleting an address, do exact match */
1773 in6_prefixlen2mask(&mask, 128);
1774 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1775 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1776
1777 cmp = 1;
1778 }
1779 }
1780
1781 IF_ADDR_RLOCK(ifp);
1782 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1783 if (ifa->ifa_addr->sa_family != AF_INET6)
1784 continue;
1785 if (!cmp)
1786 break;
1787
1788 /*
1789 * XXX: this is adhoc, but is necessary to allow
1790 * a user to specify fe80::/64 (not /10) for a
1791 * link-local address.
1792 */
1793 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1794 in6_clearscope(&candidate);
1795 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1796 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1797 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1798 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1799 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1800 break;
1801 }
1802 if (ifa != NULL)
1803 ifa_ref(ifa);
1804 IF_ADDR_RUNLOCK(ifp);
1805 if (!ifa)
1806 return EADDRNOTAVAIL;
1807 ia = ifa2ia6(ifa);
1808
1809 if (cmd == SIOCGLIFADDR) {
1810 int error;
1811
1812 /* fill in the if_laddrreq structure */
1813 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1814 error = sa6_recoverscope(
1815 (struct sockaddr_in6 *)&iflr->addr);
1816 if (error != 0) {
1817 ifa_free(ifa);
1818 return (error);
1819 }
1820
1821 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1822 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1823 ia->ia_dstaddr.sin6_len);
1824 error = sa6_recoverscope(
1825 (struct sockaddr_in6 *)&iflr->dstaddr);
1826 if (error != 0) {
1827 ifa_free(ifa);
1828 return (error);
1829 }
1830 } else
1831 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1832
1833 iflr->prefixlen =
1834 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1835
1836 iflr->flags = ia->ia6_flags; /* XXX */
1837 ifa_free(ifa);
1838
1839 return 0;
1840 } else {
1841 struct in6_aliasreq ifra;
1842
1843 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1844 bzero(&ifra, sizeof(ifra));
1845 bcopy(iflr->iflr_name, ifra.ifra_name,
1846 sizeof(ifra.ifra_name));
1847
1848 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1849 ia->ia_addr.sin6_len);
1850 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1851 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1852 ia->ia_dstaddr.sin6_len);
1853 } else {
1854 bzero(&ifra.ifra_dstaddr,
1855 sizeof(ifra.ifra_dstaddr));
1856 }
1857 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1858 ia->ia_prefixmask.sin6_len);
1859
1860 ifra.ifra_flags = ia->ia6_flags;
1861 ifa_free(ifa);
1862 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1863 ifp, td);
1864 }
1865 }
1866 }
1867
1868 return EOPNOTSUPP; /* just for safety */
1869 }
1870
1871 /*
1872 * Initialize an interface's IPv6 address and routing table entry.
1873 */
1874 static int
1875 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1876 struct sockaddr_in6 *sin6, int newhost)
1877 {
1878 int error = 0, plen, ifacount = 0;
1879 struct ifaddr *ifa;
1880
1881 /*
1882 * Give the interface a chance to initialize
1883 * if this is its first address,
1884 * and to validate the address if necessary.
1885 */
1886 IF_ADDR_RLOCK(ifp);
1887 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1888 if (ifa->ifa_addr->sa_family != AF_INET6)
1889 continue;
1890 ifacount++;
1891 }
1892 IF_ADDR_RUNLOCK(ifp);
1893
1894 ia->ia_addr = *sin6;
1895
1896 if (ifacount <= 1 && ifp->if_ioctl) {
1897 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1898 if (error)
1899 return (error);
1900 }
1901
1902 ia->ia_ifa.ifa_metric = ifp->if_metric;
1903
1904 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1905
1906 /*
1907 * Special case:
1908 * If a new destination address is specified for a point-to-point
1909 * interface, install a route to the destination as an interface
1910 * direct route.
1911 * XXX: the logic below rejects assigning multiple addresses on a p2p
1912 * interface that share the same destination.
1913 */
1914 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1915 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1916 ia->ia_dstaddr.sin6_family == AF_INET6) {
1917 int rtflags = RTF_UP | RTF_HOST;
1918 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1919 if (error)
1920 return (error);
1921 ia->ia_flags |= IFA_ROUTE;
1922 /*
1923 * Handle the case for ::1 .
1924 */
1925 if (ifp->if_flags & IFF_LOOPBACK)
1926 ia->ia_flags |= IFA_RTSELF;
1927 }
1928
1929 /*
1930 * add a loopback route to self
1931 */
1932 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1933 error = ifa_add_loopback_route((struct ifaddr *)ia,
1934 (struct sockaddr *)&ia->ia_addr);
1935 if (error == 0)
1936 ia->ia_flags |= IFA_RTSELF;
1937 }
1938
1939 /* Add local address to lltable, if necessary (ex. on p2p link). */
1940 if (newhost)
1941 in6_ifaddloop(&(ia->ia_ifa));
1942
1943 return (error);
1944 }
1945
1946 /*
1947 * Find an IPv6 interface link-local address specific to an interface.
1948 * ifaddr is returned referenced.
1949 */
1950 struct in6_ifaddr *
1951 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1952 {
1953 struct ifaddr *ifa;
1954
1955 IF_ADDR_RLOCK(ifp);
1956 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1957 if (ifa->ifa_addr->sa_family != AF_INET6)
1958 continue;
1959 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1960 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1961 ignoreflags) != 0)
1962 continue;
1963 ifa_ref(ifa);
1964 break;
1965 }
1966 }
1967 IF_ADDR_RUNLOCK(ifp);
1968
1969 return ((struct in6_ifaddr *)ifa);
1970 }
1971
1972
1973 /*
1974 * find the internet address corresponding to a given interface and address.
1975 * ifaddr is returned referenced.
1976 */
1977 struct in6_ifaddr *
1978 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1979 {
1980 struct ifaddr *ifa;
1981
1982 IF_ADDR_RLOCK(ifp);
1983 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1984 if (ifa->ifa_addr->sa_family != AF_INET6)
1985 continue;
1986 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1987 ifa_ref(ifa);
1988 break;
1989 }
1990 }
1991 IF_ADDR_RUNLOCK(ifp);
1992
1993 return ((struct in6_ifaddr *)ifa);
1994 }
1995
1996 /*
1997 * Find a link-local scoped address on ifp and return it if any.
1998 */
1999 struct in6_ifaddr *
2000 in6ifa_llaonifp(struct ifnet *ifp)
2001 {
2002 struct sockaddr_in6 *sin6;
2003 struct ifaddr *ifa;
2004
2005 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2006 return (NULL);
2007 if_addr_rlock(ifp);
2008 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2009 if (ifa->ifa_addr->sa_family != AF_INET6)
2010 continue;
2011 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2012 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
2013 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
2014 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
2015 break;
2016 }
2017 if_addr_runlock(ifp);
2018
2019 return ((struct in6_ifaddr *)ifa);
2020 }
2021
2022 /*
2023 * Convert IP6 address to printable (loggable) representation. Caller
2024 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
2025 */
2026 static char digits[] = "0123456789abcdef";
2027 char *
2028 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
2029 {
2030 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
2031 char *cp;
2032 const u_int16_t *a = (const u_int16_t *)addr;
2033 const u_int8_t *d;
2034 int dcolon = 0, zero = 0;
2035
2036 cp = ip6buf;
2037
2038 for (i = 0; i < 8; i++) {
2039 if (*(a + i) == 0) {
2040 cnt++;
2041 if (cnt == 1)
2042 idx = i;
2043 }
2044 else if (maxcnt < cnt) {
2045 maxcnt = cnt;
2046 index = idx;
2047 cnt = 0;
2048 }
2049 }
2050 if (maxcnt < cnt) {
2051 maxcnt = cnt;
2052 index = idx;
2053 }
2054
2055 for (i = 0; i < 8; i++) {
2056 if (dcolon == 1) {
2057 if (*a == 0) {
2058 if (i == 7)
2059 *cp++ = ':';
2060 a++;
2061 continue;
2062 } else
2063 dcolon = 2;
2064 }
2065 if (*a == 0) {
2066 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2067 if (i == 0)
2068 *cp++ = ':';
2069 *cp++ = ':';
2070 dcolon = 1;
2071 } else {
2072 *cp++ = '';
2073 *cp++ = ':';
2074 }
2075 a++;
2076 continue;
2077 }
2078 d = (const u_char *)a;
2079 /* Try to eliminate leading zeros in printout like in :0001. */
2080 zero = 1;
2081 *cp = digits[*d >> 4];
2082 if (*cp != '') {
2083 zero = 0;
2084 cp++;
2085 }
2086 *cp = digits[*d++ & 0xf];
2087 if (zero == 0 || (*cp != '')) {
2088 zero = 0;
2089 cp++;
2090 }
2091 *cp = digits[*d >> 4];
2092 if (zero == 0 || (*cp != '')) {
2093 zero = 0;
2094 cp++;
2095 }
2096 *cp++ = digits[*d & 0xf];
2097 *cp++ = ':';
2098 a++;
2099 }
2100 *--cp = '\0';
2101 return (ip6buf);
2102 }
2103
2104 int
2105 in6_localaddr(struct in6_addr *in6)
2106 {
2107 struct in6_ifaddr *ia;
2108
2109 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2110 return 1;
2111
2112 IN6_IFADDR_RLOCK();
2113 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2114 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2115 &ia->ia_prefixmask.sin6_addr)) {
2116 IN6_IFADDR_RUNLOCK();
2117 return 1;
2118 }
2119 }
2120 IN6_IFADDR_RUNLOCK();
2121
2122 return (0);
2123 }
2124
2125 /*
2126 * Return 1 if an internet address is for the local host and configured
2127 * on one of its interfaces.
2128 */
2129 int
2130 in6_localip(struct in6_addr *in6)
2131 {
2132 struct in6_ifaddr *ia;
2133
2134 IN6_IFADDR_RLOCK();
2135 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
2136 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2137 IN6_IFADDR_RUNLOCK();
2138 return (1);
2139 }
2140 }
2141 IN6_IFADDR_RUNLOCK();
2142 return (0);
2143 }
2144
2145 int
2146 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2147 {
2148 struct in6_ifaddr *ia;
2149
2150 IN6_IFADDR_RLOCK();
2151 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
2152 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
2153 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2154 IN6_IFADDR_RUNLOCK();
2155 return (1); /* true */
2156 }
2157 break;
2158 }
2159 }
2160 IN6_IFADDR_RUNLOCK();
2161
2162 return (0); /* false */
2163 }
2164
2165 /*
2166 * return length of part which dst and src are equal
2167 * hard coding...
2168 */
2169 int
2170 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2171 {
2172 int match = 0;
2173 u_char *s = (u_char *)src, *d = (u_char *)dst;
2174 u_char *lim = s + 16, r;
2175
2176 while (s < lim)
2177 if ((r = (*d++ ^ *s++)) != 0) {
2178 while (r < 128) {
2179 match++;
2180 r <<= 1;
2181 }
2182 break;
2183 } else
2184 match += 8;
2185 return match;
2186 }
2187
2188 /* XXX: to be scope conscious */
2189 int
2190 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2191 {
2192 int bytelen, bitlen;
2193
2194 /* sanity check */
2195 if (0 > len || len > 128) {
2196 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2197 len);
2198 return (0);
2199 }
2200
2201 bytelen = len / 8;
2202 bitlen = len % 8;
2203
2204 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2205 return (0);
2206 if (bitlen != 0 &&
2207 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2208 p2->s6_addr[bytelen] >> (8 - bitlen))
2209 return (0);
2210
2211 return (1);
2212 }
2213
2214 void
2215 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2216 {
2217 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2218 int bytelen, bitlen, i;
2219
2220 /* sanity check */
2221 if (0 > len || len > 128) {
2222 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2223 len);
2224 return;
2225 }
2226
2227 bzero(maskp, sizeof(*maskp));
2228 bytelen = len / 8;
2229 bitlen = len % 8;
2230 for (i = 0; i < bytelen; i++)
2231 maskp->s6_addr[i] = 0xff;
2232 if (bitlen)
2233 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2234 }
2235
2236 /*
2237 * return the best address out of the same scope. if no address was
2238 * found, return the first valid address from designated IF.
2239 */
2240 struct in6_ifaddr *
2241 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2242 {
2243 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2244 struct ifaddr *ifa;
2245 struct in6_ifaddr *besta = 0;
2246 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2247
2248 dep[0] = dep[1] = NULL;
2249
2250 /*
2251 * We first look for addresses in the same scope.
2252 * If there is one, return it.
2253 * If two or more, return one which matches the dst longest.
2254 * If none, return one of global addresses assigned other ifs.
2255 */
2256 IF_ADDR_RLOCK(ifp);
2257 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2258 if (ifa->ifa_addr->sa_family != AF_INET6)
2259 continue;
2260 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2261 continue; /* XXX: is there any case to allow anycast? */
2262 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2263 continue; /* don't use this interface */
2264 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2265 continue;
2266 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2267 if (V_ip6_use_deprecated)
2268 dep[0] = (struct in6_ifaddr *)ifa;
2269 continue;
2270 }
2271
2272 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2273 /*
2274 * call in6_matchlen() as few as possible
2275 */
2276 if (besta) {
2277 if (blen == -1)
2278 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2279 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2280 if (tlen > blen) {
2281 blen = tlen;
2282 besta = (struct in6_ifaddr *)ifa;
2283 }
2284 } else
2285 besta = (struct in6_ifaddr *)ifa;
2286 }
2287 }
2288 if (besta) {
2289 ifa_ref(&besta->ia_ifa);
2290 IF_ADDR_RUNLOCK(ifp);
2291 return (besta);
2292 }
2293
2294 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2295 if (ifa->ifa_addr->sa_family != AF_INET6)
2296 continue;
2297 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2298 continue; /* XXX: is there any case to allow anycast? */
2299 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2300 continue; /* don't use this interface */
2301 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2302 continue;
2303 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2304 if (V_ip6_use_deprecated)
2305 dep[1] = (struct in6_ifaddr *)ifa;
2306 continue;
2307 }
2308
2309 if (ifa != NULL)
2310 ifa_ref(ifa);
2311 IF_ADDR_RUNLOCK(ifp);
2312 return (struct in6_ifaddr *)ifa;
2313 }
2314
2315 /* use the last-resort values, that are, deprecated addresses */
2316 if (dep[0]) {
2317 ifa_ref((struct ifaddr *)dep[0]);
2318 IF_ADDR_RUNLOCK(ifp);
2319 return dep[0];
2320 }
2321 if (dep[1]) {
2322 ifa_ref((struct ifaddr *)dep[1]);
2323 IF_ADDR_RUNLOCK(ifp);
2324 return dep[1];
2325 }
2326
2327 IF_ADDR_RUNLOCK(ifp);
2328 return NULL;
2329 }
2330
2331 /*
2332 * perform DAD when interface becomes IFF_UP.
2333 */
2334 void
2335 in6_if_up(struct ifnet *ifp)
2336 {
2337 struct ifaddr *ifa;
2338 struct in6_ifaddr *ia;
2339
2340 IF_ADDR_RLOCK(ifp);
2341 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2342 if (ifa->ifa_addr->sa_family != AF_INET6)
2343 continue;
2344 ia = (struct in6_ifaddr *)ifa;
2345 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2346 /*
2347 * The TENTATIVE flag was likely set by hand
2348 * beforehand, implicitly indicating the need for DAD.
2349 * We may be able to skip the random delay in this
2350 * case, but we impose delays just in case.
2351 */
2352 nd6_dad_start(ifa,
2353 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2354 }
2355 }
2356 IF_ADDR_RUNLOCK(ifp);
2357
2358 /*
2359 * special cases, like 6to4, are handled in in6_ifattach
2360 */
2361 in6_ifattach(ifp, NULL);
2362 }
2363
2364 int
2365 in6if_do_dad(struct ifnet *ifp)
2366 {
2367 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2368 return (0);
2369
2370 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
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 * We simply skip DAD in such a case as a work around.
2392 * XXX: we should rather mark "tentative" on such addresses,
2393 * and do DAD after the interface becomes ready.
2394 */
2395 if (!((ifp->if_flags & IFF_UP) &&
2396 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2397 return (0);
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_INFINIBAND:
2453 return (64);
2454 case IFT_FDDI: /* RFC2467 */
2455 return (64);
2456 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2457 return (64);
2458 case IFT_PPP: /* RFC2472 */
2459 return (64);
2460 case IFT_ARCNET: /* RFC2497 */
2461 return (64);
2462 case IFT_FRELAY: /* RFC2590 */
2463 return (64);
2464 case IFT_IEEE1394: /* RFC3146 */
2465 return (64);
2466 case IFT_GIF:
2467 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2468 case IFT_LOOP:
2469 return (64); /* XXX: is this really correct? */
2470 default:
2471 /*
2472 * Unknown link type:
2473 * It might be controversial to use the today's common constant
2474 * of 64 for these cases unconditionally. For full compliance,
2475 * we should return an error in this case. On the other hand,
2476 * if we simply miss the standard for the link type or a new
2477 * standard is defined for a new link type, the IFID length
2478 * is very likely to be the common constant. As a compromise,
2479 * we always use the constant, but make an explicit notice
2480 * indicating the "unknown" case.
2481 */
2482 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2483 return (64);
2484 }
2485 }
2486
2487 #include <sys/sysctl.h>
2488
2489 struct in6_llentry {
2490 struct llentry base;
2491 struct sockaddr_in6 l3_addr6;
2492 };
2493
2494 /*
2495 * Deletes an address from the address table.
2496 * This function is called by the timer functions
2497 * such as arptimer() and nd6_llinfo_timer(), and
2498 * the caller does the locking.
2499 */
2500 static void
2501 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2502 {
2503 LLE_WUNLOCK(lle);
2504 LLE_LOCK_DESTROY(lle);
2505 free(lle, M_LLTABLE);
2506 }
2507
2508 static struct llentry *
2509 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2510 {
2511 struct in6_llentry *lle;
2512
2513 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2514 if (lle == NULL) /* NB: caller generates msg */
2515 return NULL;
2516
2517 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2518 lle->base.lle_refcnt = 1;
2519 lle->base.lle_free = in6_lltable_free;
2520 LLE_LOCK_INIT(&lle->base);
2521 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2522 CALLOUT_RETURNUNLOCKED);
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 #ifdef DIAGNOSTIC
2655 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2656 #endif
2657 if ((lle->la_flags &
2658 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2659 llentry_free(lle);
2660 else
2661 LLE_WUNLOCK(lle);
2662 }
2663 lle = (void *)-1;
2664 }
2665 if (LLE_IS_VALID(lle)) {
2666 if (flags & LLE_EXCLUSIVE)
2667 LLE_WLOCK(lle);
2668 else
2669 LLE_RLOCK(lle);
2670 }
2671 return (lle);
2672 }
2673
2674 static int
2675 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2676 {
2677 struct ifnet *ifp = llt->llt_ifp;
2678 struct llentry *lle;
2679 /* XXX stack use */
2680 struct {
2681 struct rt_msghdr rtm;
2682 struct sockaddr_in6 sin6;
2683 /*
2684 * ndp.c assumes that sdl is word aligned
2685 */
2686 #ifdef __LP64__
2687 uint32_t pad;
2688 #endif
2689 struct sockaddr_dl sdl;
2690 } ndpc;
2691 int i, error;
2692
2693 if (ifp->if_flags & IFF_LOOPBACK)
2694 return 0;
2695
2696 LLTABLE_LOCK_ASSERT();
2697
2698 error = 0;
2699 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2700 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2701 struct sockaddr_dl *sdl;
2702
2703 /* skip deleted or invalid entries */
2704 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2705 continue;
2706 /* Skip if jailed and not a valid IP of the prison. */
2707 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2708 continue;
2709 /*
2710 * produce a msg made of:
2711 * struct rt_msghdr;
2712 * struct sockaddr_in6 (IPv6)
2713 * struct sockaddr_dl;
2714 */
2715 bzero(&ndpc, sizeof(ndpc));
2716 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2717 ndpc.rtm.rtm_version = RTM_VERSION;
2718 ndpc.rtm.rtm_type = RTM_GET;
2719 ndpc.rtm.rtm_flags = RTF_UP;
2720 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2721 ndpc.sin6.sin6_family = AF_INET6;
2722 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2723 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2724 if (V_deembed_scopeid)
2725 sa6_recoverscope(&ndpc.sin6);
2726
2727 /* publish */
2728 if (lle->la_flags & LLE_PUB)
2729 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2730
2731 sdl = &ndpc.sdl;
2732 sdl->sdl_family = AF_LINK;
2733 sdl->sdl_len = sizeof(*sdl);
2734 sdl->sdl_alen = ifp->if_addrlen;
2735 sdl->sdl_index = ifp->if_index;
2736 sdl->sdl_type = ifp->if_type;
2737 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2738 ndpc.rtm.rtm_rmx.rmx_expire =
2739 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2740 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2741 if (lle->la_flags & LLE_STATIC)
2742 ndpc.rtm.rtm_flags |= RTF_STATIC;
2743 ndpc.rtm.rtm_index = ifp->if_index;
2744 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2745 if (error)
2746 break;
2747 }
2748 }
2749 return error;
2750 }
2751
2752 void *
2753 in6_domifattach(struct ifnet *ifp)
2754 {
2755 struct in6_ifextra *ext;
2756
2757 /* There are not IPv6-capable interfaces. */
2758 switch (ifp->if_type) {
2759 case IFT_PFLOG:
2760 case IFT_PFSYNC:
2761 case IFT_USB:
2762 return (NULL);
2763 }
2764 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2765 bzero(ext, sizeof(*ext));
2766
2767 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2768 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2769 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2770 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2771
2772 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2773 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2774 M_WAITOK);
2775 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2776 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2777
2778 ext->nd_ifinfo = nd6_ifattach(ifp);
2779 ext->scope6_id = scope6_ifattach(ifp);
2780 ext->lltable = lltable_init(ifp, AF_INET6);
2781 if (ext->lltable != NULL) {
2782 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2783 ext->lltable->llt_lookup = in6_lltable_lookup;
2784 ext->lltable->llt_dump = in6_lltable_dump;
2785 }
2786
2787 ext->mld_ifinfo = mld_domifattach(ifp);
2788
2789 return ext;
2790 }
2791
2792 void
2793 in6_domifdetach(struct ifnet *ifp, void *aux)
2794 {
2795 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2796
2797 mld_domifdetach(ifp);
2798 scope6_ifdetach(ext->scope6_id);
2799 nd6_ifdetach(ext->nd_ifinfo);
2800 lltable_free(ext->lltable);
2801 COUNTER_ARRAY_FREE(ext->in6_ifstat,
2802 sizeof(struct in6_ifstat) / sizeof(uint64_t));
2803 free(ext->in6_ifstat, M_IFADDR);
2804 COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2805 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2806 free(ext->icmp6_ifstat, M_IFADDR);
2807 free(ext, M_IFADDR);
2808 }
2809
2810 /*
2811 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2812 * v4 mapped addr or v4 compat addr
2813 */
2814 void
2815 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2816 {
2817
2818 bzero(sin, sizeof(*sin));
2819 sin->sin_len = sizeof(struct sockaddr_in);
2820 sin->sin_family = AF_INET;
2821 sin->sin_port = sin6->sin6_port;
2822 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2823 }
2824
2825 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2826 void
2827 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2828 {
2829 bzero(sin6, sizeof(*sin6));
2830 sin6->sin6_len = sizeof(struct sockaddr_in6);
2831 sin6->sin6_family = AF_INET6;
2832 sin6->sin6_port = sin->sin_port;
2833 sin6->sin6_addr.s6_addr32[0] = 0;
2834 sin6->sin6_addr.s6_addr32[1] = 0;
2835 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2836 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2837 }
2838
2839 /* Convert sockaddr_in6 into sockaddr_in. */
2840 void
2841 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2842 {
2843 struct sockaddr_in *sin_p;
2844 struct sockaddr_in6 sin6;
2845
2846 /*
2847 * Save original sockaddr_in6 addr and convert it
2848 * to sockaddr_in.
2849 */
2850 sin6 = *(struct sockaddr_in6 *)nam;
2851 sin_p = (struct sockaddr_in *)nam;
2852 in6_sin6_2_sin(sin_p, &sin6);
2853 }
2854
2855 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2856 void
2857 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2858 {
2859 struct sockaddr_in *sin_p;
2860 struct sockaddr_in6 *sin6_p;
2861
2862 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2863 sin_p = (struct sockaddr_in *)*nam;
2864 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2865 free(*nam, M_SONAME);
2866 *nam = (struct sockaddr *)sin6_p;
2867 }
Cache object: 9bf40f67c1a5ce3cd54cb71da2f62f1a
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