1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in.c 8.2 (Berkeley) 11/15/93
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
65
66 #include "opt_compat.h"
67 #include "opt_inet.h"
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/errno.h>
72 #include <sys/jail.h>
73 #include <sys/malloc.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/sockio.h>
77 #include <sys/systm.h>
78 #include <sys/priv.h>
79 #include <sys/proc.h>
80 #include <sys/time.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83
84 #include <net/if.h>
85 #include <net/if_var.h>
86 #include <net/if_types.h>
87 #include <net/route.h>
88 #include <net/if_dl.h>
89 #include <net/vnet.h>
90
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <net/if_llatbl.h>
94 #include <netinet/if_ether.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/ip.h>
97 #include <netinet/in_pcb.h>
98 #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
in6_ifaddloop(struct ifaddr * ifa)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
in6_ifremloop(struct ifaddr * ifa)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
in6_mask2len(struct in6_addr * mask,u_char * lim0)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
in6_control(struct socket * so,u_long cmd,caddr_t data,struct ifnet * ifp,struct thread * td)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 SIOCGDRLST_IN6:
327 case SIOCGPRLST_IN6:
328 case SIOCGNBRINFO_IN6:
329 case SIOCGDEFIFACE_IN6:
330 return (nd6_ioctl(cmd, data, ifp));
331
332 #ifdef COMPAT_FREEBSD32
333 case SIOCGDEFIFACE32_IN6:
334 {
335 struct in6_ndifreq ndif;
336 struct in6_ndifreq32 *ndif32;
337
338 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
339 ifp);
340 if (error)
341 return (error);
342 ndif32 = (struct in6_ndifreq32 *)data;
343 ndif32->ifindex = ndif.ifindex;
344 return (0);
345 }
346 #endif
347 }
348
349 switch (cmd) {
350 case SIOCSIFPREFIX_IN6:
351 case SIOCDIFPREFIX_IN6:
352 case SIOCAIFPREFIX_IN6:
353 case SIOCCIFPREFIX_IN6:
354 case SIOCSGIFPREFIX_IN6:
355 case SIOCGIFPREFIX_IN6:
356 log(LOG_NOTICE,
357 "prefix ioctls are now invalidated. "
358 "please use ifconfig.\n");
359 return (EOPNOTSUPP);
360 }
361
362 switch (cmd) {
363 case SIOCSSCOPE6:
364 if (td != NULL) {
365 error = priv_check(td, PRIV_NETINET_SCOPE6);
366 if (error)
367 return (error);
368 }
369 /* FALLTHROUGH */
370 case SIOCGSCOPE6:
371 case SIOCGSCOPE6DEF:
372 return (scope6_ioctl(cmd, data, ifp));
373 }
374
375 switch (cmd) {
376 case SIOCALIFADDR:
377 if (td != NULL) {
378 error = priv_check(td, PRIV_NET_ADDIFADDR);
379 if (error)
380 return (error);
381 }
382 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
383
384 case SIOCDLIFADDR:
385 if (td != NULL) {
386 error = priv_check(td, PRIV_NET_DELIFADDR);
387 if (error)
388 return (error);
389 }
390 /* FALLTHROUGH */
391 case SIOCGLIFADDR:
392 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
393 }
394
395 /*
396 * Find address for this interface, if it exists.
397 *
398 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
399 * only, and used the first interface address as the target of other
400 * operations (without checking ifra_addr). This was because netinet
401 * code/API assumed at most 1 interface address per interface.
402 * Since IPv6 allows a node to assign multiple addresses
403 * on a single interface, we almost always look and check the
404 * presence of ifra_addr, and reject invalid ones here.
405 * It also decreases duplicated code among SIOC*_IN6 operations.
406 */
407 switch (cmd) {
408 case SIOCAIFADDR_IN6:
409 case SIOCSIFPHYADDR_IN6:
410 sa6 = &ifra->ifra_addr;
411 break;
412 case SIOCSIFADDR_IN6:
413 case SIOCGIFADDR_IN6:
414 case SIOCSIFDSTADDR_IN6:
415 case SIOCSIFNETMASK_IN6:
416 case SIOCGIFDSTADDR_IN6:
417 case SIOCGIFNETMASK_IN6:
418 case SIOCDIFADDR_IN6:
419 case SIOCGIFPSRCADDR_IN6:
420 case SIOCGIFPDSTADDR_IN6:
421 case SIOCGIFAFLAG_IN6:
422 case SIOCSNDFLUSH_IN6:
423 case SIOCSPFXFLUSH_IN6:
424 case SIOCSRTRFLUSH_IN6:
425 case SIOCGIFALIFETIME_IN6:
426 case SIOCSIFALIFETIME_IN6:
427 case SIOCGIFSTAT_IN6:
428 case SIOCGIFSTAT_ICMP6:
429 sa6 = &ifr->ifr_addr;
430 break;
431 case SIOCSIFADDR:
432 case SIOCSIFBRDADDR:
433 case SIOCSIFDSTADDR:
434 case SIOCSIFNETMASK:
435 /*
436 * Although we should pass any non-INET6 ioctl requests
437 * down to driver, we filter some legacy INET requests.
438 * Drivers trust SIOCSIFADDR et al to come from an already
439 * privileged layer, and do not perform any credentials
440 * checks or input validation.
441 */
442 return (EINVAL);
443 default:
444 sa6 = NULL;
445 break;
446 }
447 if (sa6 && sa6->sin6_family == AF_INET6) {
448 if (sa6->sin6_scope_id != 0)
449 error = sa6_embedscope(sa6, 0);
450 else
451 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
452 if (error != 0)
453 return (error);
454 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
455 &sa6->sin6_addr)) != 0)
456 return (error);
457 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
458 } else
459 ia = NULL;
460
461 switch (cmd) {
462 case SIOCSIFADDR_IN6:
463 case SIOCSIFDSTADDR_IN6:
464 case SIOCSIFNETMASK_IN6:
465 /*
466 * Since IPv6 allows a node to assign multiple addresses
467 * on a single interface, SIOCSIFxxx ioctls are deprecated.
468 */
469 /* we decided to obsolete this command (20000704) */
470 error = EINVAL;
471 goto out;
472
473 case SIOCDIFADDR_IN6:
474 /*
475 * for IPv4, we look for existing in_ifaddr here to allow
476 * "ifconfig if0 delete" to remove the first IPv4 address on
477 * the interface. For IPv6, as the spec allows multiple
478 * interface address from the day one, we consider "remove the
479 * first one" semantics to be not preferable.
480 */
481 if (ia == NULL) {
482 error = EADDRNOTAVAIL;
483 goto out;
484 }
485 /* FALLTHROUGH */
486 case SIOCAIFADDR_IN6:
487 /*
488 * We always require users to specify a valid IPv6 address for
489 * the corresponding operation.
490 */
491 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
492 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
493 error = EAFNOSUPPORT;
494 goto out;
495 }
496
497 if (td != NULL) {
498 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
499 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
500 if (error)
501 goto out;
502 }
503 /* FALLTHROUGH */
504 case SIOCGIFSTAT_IN6:
505 case SIOCGIFSTAT_ICMP6:
506 if (ifp->if_afdata[AF_INET6] == NULL) {
507 error = EPFNOSUPPORT;
508 goto out;
509 }
510 break;
511
512 case SIOCGIFADDR_IN6:
513 /* This interface is basically deprecated. use SIOCGIFCONF. */
514 /* FALLTHROUGH */
515 case SIOCGIFAFLAG_IN6:
516 case SIOCGIFNETMASK_IN6:
517 case SIOCGIFDSTADDR_IN6:
518 case SIOCGIFALIFETIME_IN6:
519 /* must think again about its semantics */
520 if (ia == NULL) {
521 error = EADDRNOTAVAIL;
522 goto out;
523 }
524 break;
525
526 case SIOCSIFALIFETIME_IN6:
527 {
528 struct in6_addrlifetime *lt;
529
530 if (td != NULL) {
531 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
532 if (error)
533 goto out;
534 }
535 if (ia == NULL) {
536 error = EADDRNOTAVAIL;
537 goto out;
538 }
539 /* sanity for overflow - beware unsigned */
540 lt = &ifr->ifr_ifru.ifru_lifetime;
541 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
542 lt->ia6t_vltime + time_uptime < time_uptime) {
543 error = EINVAL;
544 goto out;
545 }
546 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
547 lt->ia6t_pltime + time_uptime < time_uptime) {
548 error = EINVAL;
549 goto out;
550 }
551 break;
552 }
553 }
554
555 switch (cmd) {
556 case SIOCGIFADDR_IN6:
557 ifr->ifr_addr = ia->ia_addr;
558 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
559 goto out;
560 break;
561
562 case SIOCGIFDSTADDR_IN6:
563 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
564 error = EINVAL;
565 goto out;
566 }
567 /*
568 * XXX: should we check if ifa_dstaddr is NULL and return
569 * an error?
570 */
571 ifr->ifr_dstaddr = ia->ia_dstaddr;
572 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
573 goto out;
574 break;
575
576 case SIOCGIFNETMASK_IN6:
577 ifr->ifr_addr = ia->ia_prefixmask;
578 break;
579
580 case SIOCGIFAFLAG_IN6:
581 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
582 break;
583
584 case SIOCGIFSTAT_IN6:
585 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
586 ifp->if_afdata[AF_INET6])->in6_ifstat,
587 &ifr->ifr_ifru.ifru_stat,
588 sizeof(struct in6_ifstat) / sizeof(uint64_t));
589 break;
590
591 case SIOCGIFSTAT_ICMP6:
592 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
593 ifp->if_afdata[AF_INET6])->icmp6_ifstat,
594 &ifr->ifr_ifru.ifru_icmp6stat,
595 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
596 break;
597
598 case SIOCGIFALIFETIME_IN6:
599 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
600 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
601 time_t maxexpire;
602 struct in6_addrlifetime *retlt =
603 &ifr->ifr_ifru.ifru_lifetime;
604
605 /*
606 * XXX: adjust expiration time assuming time_t is
607 * signed.
608 */
609 maxexpire = (-1) &
610 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
611 if (ia->ia6_lifetime.ia6t_vltime <
612 maxexpire - ia->ia6_updatetime) {
613 retlt->ia6t_expire = ia->ia6_updatetime +
614 ia->ia6_lifetime.ia6t_vltime;
615 } else
616 retlt->ia6t_expire = maxexpire;
617 }
618 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
619 time_t maxexpire;
620 struct in6_addrlifetime *retlt =
621 &ifr->ifr_ifru.ifru_lifetime;
622
623 /*
624 * XXX: adjust expiration time assuming time_t is
625 * signed.
626 */
627 maxexpire = (-1) &
628 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
629 if (ia->ia6_lifetime.ia6t_pltime <
630 maxexpire - ia->ia6_updatetime) {
631 retlt->ia6t_preferred = ia->ia6_updatetime +
632 ia->ia6_lifetime.ia6t_pltime;
633 } else
634 retlt->ia6t_preferred = maxexpire;
635 }
636 break;
637
638 case SIOCSIFALIFETIME_IN6:
639 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
640 /* for sanity */
641 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
642 ia->ia6_lifetime.ia6t_expire =
643 time_uptime + ia->ia6_lifetime.ia6t_vltime;
644 } else
645 ia->ia6_lifetime.ia6t_expire = 0;
646 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
647 ia->ia6_lifetime.ia6t_preferred =
648 time_uptime + ia->ia6_lifetime.ia6t_pltime;
649 } else
650 ia->ia6_lifetime.ia6t_preferred = 0;
651 break;
652
653 case SIOCAIFADDR_IN6:
654 {
655 int i;
656 struct nd_prefixctl pr0;
657 struct nd_prefix *pr;
658
659 /*
660 * first, make or update the interface address structure,
661 * and link it to the list.
662 */
663 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
664 goto out;
665 if (ia != NULL)
666 ifa_free(&ia->ia_ifa);
667 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
668 == NULL) {
669 /*
670 * this can happen when the user specify the 0 valid
671 * lifetime.
672 */
673 break;
674 }
675
676 if (cmd == ocmd && ifra->ifra_vhid > 0) {
677 if (carp_attach_p != NULL)
678 error = (*carp_attach_p)(&ia->ia_ifa,
679 ifra->ifra_vhid);
680 else
681 error = EPROTONOSUPPORT;
682 if (error)
683 goto out;
684 else
685 carp_attached = 1;
686 }
687
688 /*
689 * then, make the prefix on-link on the interface.
690 * XXX: we'd rather create the prefix before the address, but
691 * we need at least one address to install the corresponding
692 * interface route, so we configure the address first.
693 */
694
695 /*
696 * convert mask to prefix length (prefixmask has already
697 * been validated in in6_update_ifa().
698 */
699 bzero(&pr0, sizeof(pr0));
700 pr0.ndpr_ifp = ifp;
701 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
702 NULL);
703 if (pr0.ndpr_plen == 128) {
704 break; /* we don't need to install a host route. */
705 }
706 pr0.ndpr_prefix = ifra->ifra_addr;
707 /* apply the mask for safety. */
708 for (i = 0; i < 4; i++) {
709 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
710 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
711 }
712 /*
713 * XXX: since we don't have an API to set prefix (not address)
714 * lifetimes, we just use the same lifetimes as addresses.
715 * The (temporarily) installed lifetimes can be overridden by
716 * later advertised RAs (when accept_rtadv is non 0), which is
717 * an intended behavior.
718 */
719 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
720 pr0.ndpr_raf_auto =
721 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
722 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
723 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
724
725 /* add the prefix if not yet. */
726 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
727 /*
728 * nd6_prelist_add will install the corresponding
729 * interface route.
730 */
731 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
732 if (carp_attached)
733 (*carp_detach_p)(&ia->ia_ifa);
734 goto out;
735 }
736 if (pr == NULL) {
737 if (carp_attached)
738 (*carp_detach_p)(&ia->ia_ifa);
739 log(LOG_ERR, "nd6_prelist_add succeeded but "
740 "no prefix\n");
741 error = EINVAL;
742 goto out;
743 }
744 }
745
746 /* relate the address to the prefix */
747 if (ia->ia6_ndpr == NULL) {
748 ia->ia6_ndpr = pr;
749 pr->ndpr_refcnt++;
750
751 /*
752 * If this is the first autoconf address from the
753 * prefix, create a temporary address as well
754 * (when required).
755 */
756 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
757 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
758 int e;
759 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
760 log(LOG_NOTICE, "in6_control: failed "
761 "to create a temporary address, "
762 "errno=%d\n", e);
763 }
764 }
765 }
766
767 /*
768 * this might affect the status of autoconfigured addresses,
769 * that is, this address might make other addresses detached.
770 */
771 pfxlist_onlink_check();
772 if (error == 0 && ia) {
773 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
774 /*
775 * Try to clear the flag when a new
776 * IPv6 address is added onto an
777 * IFDISABLED interface and it
778 * succeeds.
779 */
780 struct in6_ndireq nd;
781
782 memset(&nd, 0, sizeof(nd));
783 nd.ndi.flags = ND_IFINFO(ifp)->flags;
784 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
785 if (nd6_ioctl(SIOCSIFINFO_FLAGS,
786 (caddr_t)&nd, ifp) < 0)
787 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
788 "SIOCSIFINFO_FLAGS for -ifdisabled "
789 "failed.");
790 /*
791 * Ignore failure of clearing the flag
792 * intentionally. The failure means
793 * address duplication was detected.
794 */
795 }
796 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
797 }
798 break;
799 }
800
801 case SIOCDIFADDR_IN6:
802 {
803 struct nd_prefix *pr;
804
805 /*
806 * If the address being deleted is the only one that owns
807 * the corresponding prefix, expire the prefix as well.
808 * XXX: theoretically, we don't have to worry about such
809 * relationship, since we separate the address management
810 * and the prefix management. We do this, however, to provide
811 * as much backward compatibility as possible in terms of
812 * the ioctl operation.
813 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
814 */
815 pr = ia->ia6_ndpr;
816 in6_purgeaddr(&ia->ia_ifa);
817 if (pr && pr->ndpr_refcnt == 0)
818 prelist_remove(pr);
819 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
820 break;
821 }
822
823 default:
824 if (ifp->if_ioctl == NULL) {
825 error = EOPNOTSUPP;
826 goto out;
827 }
828 error = (*ifp->if_ioctl)(ifp, cmd, data);
829 goto out;
830 }
831
832 error = 0;
833 out:
834 if (ia != NULL)
835 ifa_free(&ia->ia_ifa);
836 return (error);
837 }
838
839
840 /*
841 * Join necessary multicast groups. Factored out from in6_update_ifa().
842 * This entire work should only be done once, for the default FIB.
843 */
844 static int
in6_update_ifa_join_mc(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags,struct in6_multi ** in6m_sol)845 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
846 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
847 {
848 char ip6buf[INET6_ADDRSTRLEN];
849 struct sockaddr_in6 mltaddr, mltmask;
850 struct in6_addr llsol;
851 struct in6_multi_mship *imm;
852 struct rtentry *rt;
853 int delay, error;
854
855 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
856
857 /* Join solicited multicast addr for new host id. */
858 bzero(&llsol, sizeof(struct in6_addr));
859 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
860 llsol.s6_addr32[1] = 0;
861 llsol.s6_addr32[2] = htonl(1);
862 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
863 llsol.s6_addr8[12] = 0xff;
864 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
865 /* XXX: should not happen */
866 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
867 goto cleanup;
868 }
869 delay = 0;
870 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
871 /*
872 * We need a random delay for DAD on the address being
873 * configured. It also means delaying transmission of the
874 * corresponding MLD report to avoid report collision.
875 * [RFC 4861, Section 6.3.7]
876 */
877 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
878 }
879 imm = in6_joingroup(ifp, &llsol, &error, delay);
880 if (imm == NULL) {
881 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
882 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
883 if_name(ifp), error));
884 goto cleanup;
885 }
886 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
887 *in6m_sol = imm->i6mm_maddr;
888
889 bzero(&mltmask, sizeof(mltmask));
890 mltmask.sin6_len = sizeof(struct sockaddr_in6);
891 mltmask.sin6_family = AF_INET6;
892 mltmask.sin6_addr = in6mask32;
893 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
894
895 /*
896 * Join link-local all-nodes address.
897 */
898 bzero(&mltaddr, sizeof(mltaddr));
899 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
900 mltaddr.sin6_family = AF_INET6;
901 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
902 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
903 goto cleanup; /* XXX: should not fail */
904
905 /*
906 * XXX: do we really need this automatic routes? We should probably
907 * reconsider this stuff. Most applications actually do not need the
908 * routes, since they usually specify the outgoing interface.
909 */
910 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
911 if (rt != NULL) {
912 /* XXX: only works in !SCOPEDROUTING case. */
913 if (memcmp(&mltaddr.sin6_addr,
914 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
915 MLTMASK_LEN)) {
916 RTFREE_LOCKED(rt);
917 rt = NULL;
918 }
919 }
920 if (rt == NULL) {
921 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
922 (struct sockaddr *)&ia->ia_addr,
923 (struct sockaddr *)&mltmask, RTF_UP,
924 (struct rtentry **)0, RT_DEFAULT_FIB);
925 if (error)
926 goto cleanup;
927 } else
928 RTFREE_LOCKED(rt);
929
930 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
931 if (imm == NULL) {
932 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
933 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
934 &mltaddr.sin6_addr), if_name(ifp), error));
935 goto cleanup;
936 }
937 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
938
939 /*
940 * Join node information group address.
941 */
942 delay = 0;
943 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
944 /*
945 * The spec does not say anything about delay for this group,
946 * but the same logic should apply.
947 */
948 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
949 }
950 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
951 /* XXX jinmei */
952 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
953 if (imm == NULL)
954 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
955 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
956 &mltaddr.sin6_addr), if_name(ifp), error));
957 /* XXX not very fatal, go on... */
958 else
959 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
960 }
961 if (V_icmp6_nodeinfo_oldmcprefix &&
962 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
963 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
964 if (imm == NULL)
965 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
966 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
967 &mltaddr.sin6_addr), if_name(ifp), error));
968 /* XXX not very fatal, go on... */
969 else
970 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
971 }
972
973 /*
974 * Join interface-local all-nodes address.
975 * (ff01::1%ifN, and ff01::%ifN/32)
976 */
977 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
978 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
979 goto cleanup; /* XXX: should not fail */
980 /* XXX: again, do we really need the route? */
981 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
982 if (rt != NULL) {
983 if (memcmp(&mltaddr.sin6_addr,
984 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
985 MLTMASK_LEN)) {
986 RTFREE_LOCKED(rt);
987 rt = NULL;
988 }
989 }
990 if (rt == NULL) {
991 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
992 (struct sockaddr *)&ia->ia_addr,
993 (struct sockaddr *)&mltmask, RTF_UP,
994 (struct rtentry **)0, RT_DEFAULT_FIB);
995 if (error)
996 goto cleanup;
997 } else
998 RTFREE_LOCKED(rt);
999
1000 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1001 if (imm == NULL) {
1002 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
1003 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
1004 &mltaddr.sin6_addr), if_name(ifp), error));
1005 goto cleanup;
1006 }
1007 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1008 #undef MLTMASK_LEN
1009
1010 cleanup:
1011 return (error);
1012 }
1013
1014 /*
1015 * Update parameters of an IPv6 interface address.
1016 * If necessary, a new entry is created and linked into address chains.
1017 * This function is separated from in6_control().
1018 */
1019 int
in6_update_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags)1020 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1021 struct in6_ifaddr *ia, int flags)
1022 {
1023 int error = 0, hostIsNew = 0, plen = -1;
1024 struct sockaddr_in6 dst6;
1025 struct in6_addrlifetime *lt;
1026 struct in6_multi *in6m_sol;
1027 int delay;
1028 char ip6buf[INET6_ADDRSTRLEN];
1029
1030 /* Validate parameters */
1031 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1032 return (EINVAL);
1033
1034 /*
1035 * The destination address for a p2p link must have a family
1036 * of AF_UNSPEC or AF_INET6.
1037 */
1038 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1039 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1040 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1041 return (EAFNOSUPPORT);
1042 /*
1043 * validate ifra_prefixmask. don't check sin6_family, netmask
1044 * does not carry fields other than sin6_len.
1045 */
1046 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1047 return (EINVAL);
1048 /*
1049 * Because the IPv6 address architecture is classless, we require
1050 * users to specify a (non 0) prefix length (mask) for a new address.
1051 * We also require the prefix (when specified) mask is valid, and thus
1052 * reject a non-consecutive mask.
1053 */
1054 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1055 return (EINVAL);
1056 if (ifra->ifra_prefixmask.sin6_len != 0) {
1057 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1058 (u_char *)&ifra->ifra_prefixmask +
1059 ifra->ifra_prefixmask.sin6_len);
1060 if (plen <= 0)
1061 return (EINVAL);
1062 } else {
1063 /*
1064 * In this case, ia must not be NULL. We just use its prefix
1065 * length.
1066 */
1067 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1068 }
1069 /*
1070 * If the destination address on a p2p interface is specified,
1071 * and the address is a scoped one, validate/set the scope
1072 * zone identifier.
1073 */
1074 dst6 = ifra->ifra_dstaddr;
1075 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1076 (dst6.sin6_family == AF_INET6)) {
1077 struct in6_addr in6_tmp;
1078 u_int32_t zoneid;
1079
1080 in6_tmp = dst6.sin6_addr;
1081 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1082 return (EINVAL); /* XXX: should be impossible */
1083
1084 if (dst6.sin6_scope_id != 0) {
1085 if (dst6.sin6_scope_id != zoneid)
1086 return (EINVAL);
1087 } else /* user omit to specify the ID. */
1088 dst6.sin6_scope_id = zoneid;
1089
1090 /* convert into the internal form */
1091 if (sa6_embedscope(&dst6, 0))
1092 return (EINVAL); /* XXX: should be impossible */
1093 }
1094 /*
1095 * The destination address can be specified only for a p2p or a
1096 * loopback interface. If specified, the corresponding prefix length
1097 * must be 128.
1098 */
1099 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1100 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1101 /* XXX: noisy message */
1102 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1103 "be specified for a p2p or a loopback IF only\n"));
1104 return (EINVAL);
1105 }
1106 if (plen != 128) {
1107 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1108 "be 128 when dstaddr is specified\n"));
1109 return (EINVAL);
1110 }
1111 }
1112 /* lifetime consistency check */
1113 lt = &ifra->ifra_lifetime;
1114 if (lt->ia6t_pltime > lt->ia6t_vltime)
1115 return (EINVAL);
1116 if (lt->ia6t_vltime == 0) {
1117 /*
1118 * the following log might be noisy, but this is a typical
1119 * configuration mistake or a tool's bug.
1120 */
1121 nd6log((LOG_INFO,
1122 "in6_update_ifa: valid lifetime is 0 for %s\n",
1123 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1124
1125 if (ia == NULL)
1126 return (0); /* there's nothing to do */
1127 }
1128
1129 /*
1130 * If this is a new address, allocate a new ifaddr and link it
1131 * into chains.
1132 */
1133 if (ia == NULL) {
1134 hostIsNew = 1;
1135 /*
1136 * When in6_update_ifa() is called in a process of a received
1137 * RA, it is called under an interrupt context. So, we should
1138 * call malloc with M_NOWAIT.
1139 */
1140 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1141 M_NOWAIT);
1142 if (ia == NULL)
1143 return (ENOBUFS);
1144 bzero((caddr_t)ia, sizeof(*ia));
1145 ifa_init(&ia->ia_ifa);
1146 LIST_INIT(&ia->ia6_memberships);
1147 /* Initialize the address and masks, and put time stamp */
1148 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1149 ia->ia_addr.sin6_family = AF_INET6;
1150 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1151 ia->ia6_createtime = time_uptime;
1152 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1153 /*
1154 * XXX: some functions expect that ifa_dstaddr is not
1155 * NULL for p2p interfaces.
1156 */
1157 ia->ia_ifa.ifa_dstaddr =
1158 (struct sockaddr *)&ia->ia_dstaddr;
1159 } else {
1160 ia->ia_ifa.ifa_dstaddr = NULL;
1161 }
1162 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1163 ia->ia_ifp = ifp;
1164 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1165 IF_ADDR_WLOCK(ifp);
1166 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1167 IF_ADDR_WUNLOCK(ifp);
1168
1169 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1170 IN6_IFADDR_WLOCK();
1171 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1172 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr),
1173 ia, ia6_hash);
1174 IN6_IFADDR_WUNLOCK();
1175 }
1176
1177 /* update timestamp */
1178 ia->ia6_updatetime = time_uptime;
1179
1180 /* set prefix mask */
1181 if (ifra->ifra_prefixmask.sin6_len) {
1182 /*
1183 * We prohibit changing the prefix length of an existing
1184 * address, because
1185 * + such an operation should be rare in IPv6, and
1186 * + the operation would confuse prefix management.
1187 */
1188 if (ia->ia_prefixmask.sin6_len &&
1189 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1190 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1191 " existing (%s) address should not be changed\n",
1192 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1193 error = EINVAL;
1194 goto unlink;
1195 }
1196 ia->ia_prefixmask = ifra->ifra_prefixmask;
1197 ia->ia_prefixmask.sin6_family = AF_INET6;
1198 }
1199
1200 /*
1201 * If a new destination address is specified, scrub the old one and
1202 * install the new destination. Note that the interface must be
1203 * p2p or loopback (see the check above.)
1204 */
1205 if (dst6.sin6_family == AF_INET6 &&
1206 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1207 int e;
1208
1209 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1210 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1211 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1212 "a route to the old destination: %s\n",
1213 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1214 /* proceed anyway... */
1215 } else
1216 ia->ia_flags &= ~IFA_ROUTE;
1217 ia->ia_dstaddr = dst6;
1218 }
1219
1220 /*
1221 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1222 * to see if the address is deprecated or invalidated, but initialize
1223 * these members for applications.
1224 */
1225 ia->ia6_lifetime = ifra->ifra_lifetime;
1226 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1227 ia->ia6_lifetime.ia6t_expire =
1228 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1229 } else
1230 ia->ia6_lifetime.ia6t_expire = 0;
1231 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1232 ia->ia6_lifetime.ia6t_preferred =
1233 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1234 } else
1235 ia->ia6_lifetime.ia6t_preferred = 0;
1236
1237 /* reset the interface and routing table appropriately. */
1238 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1239 goto unlink;
1240
1241 /*
1242 * configure address flags.
1243 */
1244 ia->ia6_flags = ifra->ifra_flags;
1245 /*
1246 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1247 * userland, make it deprecated.
1248 */
1249 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1250 ia->ia6_lifetime.ia6t_pltime = 0;
1251 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1252 }
1253 /*
1254 * Make the address tentative before joining multicast addresses,
1255 * so that corresponding MLD responses would not have a tentative
1256 * source address.
1257 */
1258 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1259 if (hostIsNew && in6if_do_dad(ifp))
1260 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1261
1262 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1263 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1264 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1265
1266 /*
1267 * We are done if we have simply modified an existing address.
1268 */
1269 if (!hostIsNew)
1270 return (error);
1271
1272 /*
1273 * Beyond this point, we should call in6_purgeaddr upon an error,
1274 * not just go to unlink.
1275 */
1276
1277 /* Join necessary multicast groups. */
1278 in6m_sol = NULL;
1279 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1280 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1281 if (error)
1282 goto cleanup;
1283 }
1284
1285 /*
1286 * Perform DAD, if needed.
1287 * XXX It may be of use, if we can administratively disable DAD.
1288 */
1289 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1290 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1291 {
1292 int mindelay, maxdelay;
1293
1294 delay = 0;
1295 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1296 /*
1297 * We need to impose a delay before sending an NS
1298 * for DAD. Check if we also needed a delay for the
1299 * corresponding MLD message. If we did, the delay
1300 * should be larger than the MLD delay (this could be
1301 * relaxed a bit, but this simple logic is at least
1302 * safe).
1303 * XXX: Break data hiding guidelines and look at
1304 * state for the solicited multicast group.
1305 */
1306 mindelay = 0;
1307 if (in6m_sol != NULL &&
1308 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1309 mindelay = in6m_sol->in6m_timer;
1310 }
1311 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1312 if (maxdelay - mindelay == 0)
1313 delay = 0;
1314 else {
1315 delay =
1316 (arc4random() % (maxdelay - mindelay)) +
1317 mindelay;
1318 }
1319 }
1320 nd6_dad_start((struct ifaddr *)ia, delay);
1321 }
1322
1323 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1324 ifa_free(&ia->ia_ifa);
1325 return (error);
1326
1327 unlink:
1328 /*
1329 * XXX: if a change of an existing address failed, keep the entry
1330 * anyway.
1331 */
1332 if (hostIsNew) {
1333 in6_unlink_ifa(ia, ifp);
1334 ifa_free(&ia->ia_ifa);
1335 }
1336 return (error);
1337
1338 cleanup:
1339 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1340 ifa_free(&ia->ia_ifa);
1341 in6_purgeaddr(&ia->ia_ifa);
1342 return error;
1343 }
1344
1345 /*
1346 * Leave multicast groups. Factored out from in6_purgeaddr().
1347 * This entire work should only be done once, for the default FIB.
1348 */
1349 static int
in6_purgeaddr_mc(struct ifnet * ifp,struct in6_ifaddr * ia,struct ifaddr * ifa0)1350 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1351 {
1352 struct sockaddr_in6 mltaddr, mltmask;
1353 struct in6_multi_mship *imm;
1354 struct rtentry *rt;
1355 struct sockaddr_in6 sin6;
1356 int error;
1357
1358 /*
1359 * Leave from multicast groups we have joined for the interface.
1360 */
1361 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1362 LIST_REMOVE(imm, i6mm_chain);
1363 in6_leavegroup(imm);
1364 }
1365
1366 /*
1367 * Remove the link-local all-nodes address.
1368 */
1369 bzero(&mltmask, sizeof(mltmask));
1370 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1371 mltmask.sin6_family = AF_INET6;
1372 mltmask.sin6_addr = in6mask32;
1373
1374 bzero(&mltaddr, sizeof(mltaddr));
1375 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1376 mltaddr.sin6_family = AF_INET6;
1377 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1378
1379 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1380 return (error);
1381
1382 /*
1383 * As for the mltaddr above, proactively prepare the sin6 to avoid
1384 * rtentry un- and re-locking.
1385 */
1386 if (ifa0 != NULL) {
1387 bzero(&sin6, sizeof(sin6));
1388 sin6.sin6_len = sizeof(sin6);
1389 sin6.sin6_family = AF_INET6;
1390 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1391 sizeof(sin6.sin6_addr));
1392 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1393 if (error != 0)
1394 return (error);
1395 }
1396
1397 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1398 if (rt != NULL && rt->rt_gateway != NULL &&
1399 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1400 &ia->ia_addr.sin6_addr,
1401 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1402 /*
1403 * If no more IPv6 address exists on this interface then
1404 * remove the multicast address route.
1405 */
1406 if (ifa0 == NULL) {
1407 memcpy(&mltaddr.sin6_addr,
1408 &satosin6(rt_key(rt))->sin6_addr,
1409 sizeof(mltaddr.sin6_addr));
1410 RTFREE_LOCKED(rt);
1411 error = in6_rtrequest(RTM_DELETE,
1412 (struct sockaddr *)&mltaddr,
1413 (struct sockaddr *)&ia->ia_addr,
1414 (struct sockaddr *)&mltmask, RTF_UP,
1415 (struct rtentry **)0, RT_DEFAULT_FIB);
1416 if (error)
1417 log(LOG_INFO, "%s: link-local all-nodes "
1418 "multicast address deletion error\n",
1419 __func__);
1420 } else {
1421 /*
1422 * Replace the gateway of the route.
1423 */
1424 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1425 RTFREE_LOCKED(rt);
1426 }
1427 } else {
1428 if (rt != NULL)
1429 RTFREE_LOCKED(rt);
1430 }
1431
1432 /*
1433 * Remove the node-local all-nodes address.
1434 */
1435 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1436 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1437 return (error);
1438
1439 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1440 if (rt != NULL && rt->rt_gateway != NULL &&
1441 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1442 &ia->ia_addr.sin6_addr,
1443 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1444 /*
1445 * If no more IPv6 address exists on this interface then
1446 * remove the multicast address route.
1447 */
1448 if (ifa0 == NULL) {
1449 memcpy(&mltaddr.sin6_addr,
1450 &satosin6(rt_key(rt))->sin6_addr,
1451 sizeof(mltaddr.sin6_addr));
1452
1453 RTFREE_LOCKED(rt);
1454 error = in6_rtrequest(RTM_DELETE,
1455 (struct sockaddr *)&mltaddr,
1456 (struct sockaddr *)&ia->ia_addr,
1457 (struct sockaddr *)&mltmask, RTF_UP,
1458 (struct rtentry **)0, RT_DEFAULT_FIB);
1459 if (error)
1460 log(LOG_INFO, "%s: node-local all-nodes"
1461 "multicast address deletion error\n",
1462 __func__);
1463 } else {
1464 /*
1465 * Replace the gateway of the route.
1466 */
1467 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1468 RTFREE_LOCKED(rt);
1469 }
1470 } else {
1471 if (rt != NULL)
1472 RTFREE_LOCKED(rt);
1473 }
1474
1475 return (0);
1476 }
1477
1478 void
in6_purgeaddr(struct ifaddr * ifa)1479 in6_purgeaddr(struct ifaddr *ifa)
1480 {
1481 struct ifnet *ifp = ifa->ifa_ifp;
1482 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1483 int plen, error;
1484 struct ifaddr *ifa0;
1485
1486 if (ifa->ifa_carp)
1487 (*carp_detach_p)(ifa);
1488
1489 /*
1490 * find another IPv6 address as the gateway for the
1491 * link-local and node-local all-nodes multicast
1492 * address routes
1493 */
1494 IF_ADDR_RLOCK(ifp);
1495 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1496 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1497 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1498 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1499 continue;
1500 else
1501 break;
1502 }
1503 if (ifa0 != NULL)
1504 ifa_ref(ifa0);
1505 IF_ADDR_RUNLOCK(ifp);
1506
1507 /*
1508 * Remove the loopback route to the interface address.
1509 * The check for the current setting of "nd6_useloopback"
1510 * is not needed.
1511 */
1512 if (ia->ia_flags & IFA_RTSELF) {
1513 error = ifa_del_loopback_route((struct ifaddr *)ia,
1514 (struct sockaddr *)&ia->ia_addr);
1515 if (error == 0)
1516 ia->ia_flags &= ~IFA_RTSELF;
1517 }
1518
1519 /* stop DAD processing */
1520 nd6_dad_stop(ifa);
1521
1522 /* Remove local address entry from lltable. */
1523 in6_ifremloop(ifa);
1524
1525 /* Leave multicast groups. */
1526 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1527
1528 if (ifa0 != NULL)
1529 ifa_free(ifa0);
1530
1531 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1532 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1533 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1534 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1535 if (error != 0)
1536 log(LOG_INFO, "%s: err=%d, destination address delete "
1537 "failed\n", __func__, error);
1538 ia->ia_flags &= ~IFA_ROUTE;
1539 }
1540
1541 in6_unlink_ifa(ia, ifp);
1542 }
1543
1544 static void
in6_unlink_ifa(struct in6_ifaddr * ia,struct ifnet * ifp)1545 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1546 {
1547 char ip6buf[INET6_ADDRSTRLEN];
1548
1549 IF_ADDR_WLOCK(ifp);
1550 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1551 IF_ADDR_WUNLOCK(ifp);
1552 ifa_free(&ia->ia_ifa); /* if_addrhead */
1553
1554 /*
1555 * Defer the release of what might be the last reference to the
1556 * in6_ifaddr so that it can't be freed before the remainder of the
1557 * cleanup.
1558 */
1559 IN6_IFADDR_WLOCK();
1560 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1561 LIST_REMOVE(ia, ia6_hash);
1562 IN6_IFADDR_WUNLOCK();
1563
1564 /*
1565 * Release the reference to the base prefix. There should be a
1566 * positive reference.
1567 */
1568 if (ia->ia6_ndpr == NULL) {
1569 nd6log((LOG_NOTICE,
1570 "in6_unlink_ifa: autoconf'ed address "
1571 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1572 } else {
1573 ia->ia6_ndpr->ndpr_refcnt--;
1574 ia->ia6_ndpr = NULL;
1575 }
1576
1577 /*
1578 * Also, if the address being removed is autoconf'ed, call
1579 * pfxlist_onlink_check() since the release might affect the status of
1580 * other (detached) addresses.
1581 */
1582 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1583 pfxlist_onlink_check();
1584 }
1585 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1586 }
1587
1588 void
in6_purgeif(struct ifnet * ifp)1589 in6_purgeif(struct ifnet *ifp)
1590 {
1591 struct ifaddr *ifa, *nifa;
1592
1593 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1594 if (ifa->ifa_addr->sa_family != AF_INET6)
1595 continue;
1596 in6_purgeaddr(ifa);
1597 }
1598
1599 in6_ifdetach(ifp);
1600 }
1601
1602 /*
1603 * SIOC[GAD]LIFADDR.
1604 * SIOCGLIFADDR: get first address. (?)
1605 * SIOCGLIFADDR with IFLR_PREFIX:
1606 * get first address that matches the specified prefix.
1607 * SIOCALIFADDR: add the specified address.
1608 * SIOCALIFADDR with IFLR_PREFIX:
1609 * add the specified prefix, filling hostid part from
1610 * the first link-local address. prefixlen must be <= 64.
1611 * SIOCDLIFADDR: delete the specified address.
1612 * SIOCDLIFADDR with IFLR_PREFIX:
1613 * delete the first address that matches the specified prefix.
1614 * return values:
1615 * EINVAL on invalid parameters
1616 * EADDRNOTAVAIL on prefix match failed/specified address not found
1617 * other values may be returned from in6_ioctl()
1618 *
1619 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1620 * this is to accomodate address naming scheme other than RFC2374,
1621 * in the future.
1622 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1623 * address encoding scheme. (see figure on page 8)
1624 */
1625 static int
in6_lifaddr_ioctl(struct socket * so,u_long cmd,caddr_t data,struct ifnet * ifp,struct thread * td)1626 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1627 struct ifnet *ifp, struct thread *td)
1628 {
1629 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1630 struct ifaddr *ifa;
1631 struct sockaddr *sa;
1632
1633 /* sanity checks */
1634 if (!data || !ifp) {
1635 panic("invalid argument to in6_lifaddr_ioctl");
1636 /* NOTREACHED */
1637 }
1638
1639 switch (cmd) {
1640 case SIOCGLIFADDR:
1641 /* address must be specified on GET with IFLR_PREFIX */
1642 if ((iflr->flags & IFLR_PREFIX) == 0)
1643 break;
1644 /* FALLTHROUGH */
1645 case SIOCALIFADDR:
1646 case SIOCDLIFADDR:
1647 /* address must be specified on ADD and DELETE */
1648 sa = (struct sockaddr *)&iflr->addr;
1649 if (sa->sa_family != AF_INET6)
1650 return EINVAL;
1651 if (sa->sa_len != sizeof(struct sockaddr_in6))
1652 return EINVAL;
1653 /* XXX need improvement */
1654 sa = (struct sockaddr *)&iflr->dstaddr;
1655 if (sa->sa_family && sa->sa_family != AF_INET6)
1656 return EINVAL;
1657 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1658 return EINVAL;
1659 break;
1660 default: /* shouldn't happen */
1661 #if 0
1662 panic("invalid cmd to in6_lifaddr_ioctl");
1663 /* NOTREACHED */
1664 #else
1665 return EOPNOTSUPP;
1666 #endif
1667 }
1668 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1669 return EINVAL;
1670
1671 switch (cmd) {
1672 case SIOCALIFADDR:
1673 {
1674 struct in6_aliasreq ifra;
1675 struct in6_addr *hostid = NULL;
1676 int prefixlen;
1677
1678 ifa = NULL;
1679 if ((iflr->flags & IFLR_PREFIX) != 0) {
1680 struct sockaddr_in6 *sin6;
1681
1682 /*
1683 * hostid is to fill in the hostid part of the
1684 * address. hostid points to the first link-local
1685 * address attached to the interface.
1686 */
1687 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1688 if (!ifa)
1689 return EADDRNOTAVAIL;
1690 hostid = IFA_IN6(ifa);
1691
1692 /* prefixlen must be <= 64. */
1693 if (64 < iflr->prefixlen) {
1694 if (ifa != NULL)
1695 ifa_free(ifa);
1696 return EINVAL;
1697 }
1698 prefixlen = iflr->prefixlen;
1699
1700 /* hostid part must be zero. */
1701 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1702 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1703 sin6->sin6_addr.s6_addr32[3] != 0) {
1704 if (ifa != NULL)
1705 ifa_free(ifa);
1706 return EINVAL;
1707 }
1708 } else
1709 prefixlen = iflr->prefixlen;
1710
1711 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1712 bzero(&ifra, sizeof(ifra));
1713 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1714
1715 bcopy(&iflr->addr, &ifra.ifra_addr,
1716 ((struct sockaddr *)&iflr->addr)->sa_len);
1717 if (hostid) {
1718 /* fill in hostid part */
1719 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1720 hostid->s6_addr32[2];
1721 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1722 hostid->s6_addr32[3];
1723 }
1724
1725 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1726 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1727 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1728 if (hostid) {
1729 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1730 hostid->s6_addr32[2];
1731 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1732 hostid->s6_addr32[3];
1733 }
1734 }
1735 if (ifa != NULL)
1736 ifa_free(ifa);
1737
1738 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1739 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1740
1741 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1742 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1743 }
1744 case SIOCGLIFADDR:
1745 case SIOCDLIFADDR:
1746 {
1747 struct in6_ifaddr *ia;
1748 struct in6_addr mask, candidate, match;
1749 struct sockaddr_in6 *sin6;
1750 int cmp;
1751
1752 bzero(&mask, sizeof(mask));
1753 if (iflr->flags & IFLR_PREFIX) {
1754 /* lookup a prefix rather than address. */
1755 in6_prefixlen2mask(&mask, iflr->prefixlen);
1756
1757 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1758 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1759 match.s6_addr32[0] &= mask.s6_addr32[0];
1760 match.s6_addr32[1] &= mask.s6_addr32[1];
1761 match.s6_addr32[2] &= mask.s6_addr32[2];
1762 match.s6_addr32[3] &= mask.s6_addr32[3];
1763
1764 /* if you set extra bits, that's wrong */
1765 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1766 return EINVAL;
1767
1768 cmp = 1;
1769 } else {
1770 if (cmd == SIOCGLIFADDR) {
1771 /* on getting an address, take the 1st match */
1772 cmp = 0; /* XXX */
1773 } else {
1774 /* on deleting an address, do exact match */
1775 in6_prefixlen2mask(&mask, 128);
1776 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1777 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1778
1779 cmp = 1;
1780 }
1781 }
1782
1783 IF_ADDR_RLOCK(ifp);
1784 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1785 if (ifa->ifa_addr->sa_family != AF_INET6)
1786 continue;
1787 if (!cmp)
1788 break;
1789
1790 /*
1791 * XXX: this is adhoc, but is necessary to allow
1792 * a user to specify fe80::/64 (not /10) for a
1793 * link-local address.
1794 */
1795 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1796 in6_clearscope(&candidate);
1797 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1798 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1799 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1800 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1801 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1802 break;
1803 }
1804 if (ifa != NULL)
1805 ifa_ref(ifa);
1806 IF_ADDR_RUNLOCK(ifp);
1807 if (!ifa)
1808 return EADDRNOTAVAIL;
1809 ia = ifa2ia6(ifa);
1810
1811 if (cmd == SIOCGLIFADDR) {
1812 int error;
1813
1814 /* fill in the if_laddrreq structure */
1815 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1816 error = sa6_recoverscope(
1817 (struct sockaddr_in6 *)&iflr->addr);
1818 if (error != 0) {
1819 ifa_free(ifa);
1820 return (error);
1821 }
1822
1823 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1824 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1825 ia->ia_dstaddr.sin6_len);
1826 error = sa6_recoverscope(
1827 (struct sockaddr_in6 *)&iflr->dstaddr);
1828 if (error != 0) {
1829 ifa_free(ifa);
1830 return (error);
1831 }
1832 } else
1833 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1834
1835 iflr->prefixlen =
1836 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1837
1838 iflr->flags = ia->ia6_flags; /* XXX */
1839 ifa_free(ifa);
1840
1841 return 0;
1842 } else {
1843 struct in6_aliasreq ifra;
1844
1845 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1846 bzero(&ifra, sizeof(ifra));
1847 bcopy(iflr->iflr_name, ifra.ifra_name,
1848 sizeof(ifra.ifra_name));
1849
1850 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1851 ia->ia_addr.sin6_len);
1852 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1853 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1854 ia->ia_dstaddr.sin6_len);
1855 } else {
1856 bzero(&ifra.ifra_dstaddr,
1857 sizeof(ifra.ifra_dstaddr));
1858 }
1859 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1860 ia->ia_prefixmask.sin6_len);
1861
1862 ifra.ifra_flags = ia->ia6_flags;
1863 ifa_free(ifa);
1864 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1865 ifp, td);
1866 }
1867 }
1868 }
1869
1870 return EOPNOTSUPP; /* just for safety */
1871 }
1872
1873 /*
1874 * Initialize an interface's IPv6 address and routing table entry.
1875 */
1876 static int
in6_ifinit(struct ifnet * ifp,struct in6_ifaddr * ia,struct sockaddr_in6 * sin6,int newhost)1877 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1878 struct sockaddr_in6 *sin6, int newhost)
1879 {
1880 int error = 0, plen, ifacount = 0;
1881 struct ifaddr *ifa;
1882
1883 /*
1884 * Give the interface a chance to initialize
1885 * if this is its first address,
1886 * and to validate the address if necessary.
1887 */
1888 IF_ADDR_RLOCK(ifp);
1889 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1890 if (ifa->ifa_addr->sa_family != AF_INET6)
1891 continue;
1892 ifacount++;
1893 }
1894 IF_ADDR_RUNLOCK(ifp);
1895
1896 ia->ia_addr = *sin6;
1897
1898 if (ifacount <= 1 && ifp->if_ioctl) {
1899 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1900 if (error)
1901 return (error);
1902 }
1903
1904 ia->ia_ifa.ifa_metric = ifp->if_metric;
1905
1906 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1907
1908 /*
1909 * Special case:
1910 * If a new destination address is specified for a point-to-point
1911 * interface, install a route to the destination as an interface
1912 * direct route.
1913 * XXX: the logic below rejects assigning multiple addresses on a p2p
1914 * interface that share the same destination.
1915 */
1916 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1917 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1918 ia->ia_dstaddr.sin6_family == AF_INET6) {
1919 int rtflags = RTF_UP | RTF_HOST;
1920 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1921 if (error)
1922 return (error);
1923 ia->ia_flags |= IFA_ROUTE;
1924 /*
1925 * Handle the case for ::1 .
1926 */
1927 if (ifp->if_flags & IFF_LOOPBACK)
1928 ia->ia_flags |= IFA_RTSELF;
1929 }
1930
1931 /*
1932 * add a loopback route to self
1933 */
1934 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1935 error = ifa_add_loopback_route((struct ifaddr *)ia,
1936 (struct sockaddr *)&ia->ia_addr);
1937 if (error == 0)
1938 ia->ia_flags |= IFA_RTSELF;
1939 }
1940
1941 /* Add local address to lltable, if necessary (ex. on p2p link). */
1942 if (newhost)
1943 in6_ifaddloop(&(ia->ia_ifa));
1944
1945 return (error);
1946 }
1947
1948 /*
1949 * Find an IPv6 interface link-local address specific to an interface.
1950 * ifaddr is returned referenced.
1951 */
1952 struct in6_ifaddr *
in6ifa_ifpforlinklocal(struct ifnet * ifp,int ignoreflags)1953 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1954 {
1955 struct ifaddr *ifa;
1956
1957 IF_ADDR_RLOCK(ifp);
1958 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1959 if (ifa->ifa_addr->sa_family != AF_INET6)
1960 continue;
1961 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1962 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1963 ignoreflags) != 0)
1964 continue;
1965 ifa_ref(ifa);
1966 break;
1967 }
1968 }
1969 IF_ADDR_RUNLOCK(ifp);
1970
1971 return ((struct in6_ifaddr *)ifa);
1972 }
1973
1974
1975 /*
1976 * find the internet address corresponding to a given interface and address.
1977 * ifaddr is returned referenced.
1978 */
1979 struct in6_ifaddr *
in6ifa_ifpwithaddr(struct ifnet * ifp,struct in6_addr * addr)1980 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1981 {
1982 struct ifaddr *ifa;
1983
1984 IF_ADDR_RLOCK(ifp);
1985 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1986 if (ifa->ifa_addr->sa_family != AF_INET6)
1987 continue;
1988 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1989 ifa_ref(ifa);
1990 break;
1991 }
1992 }
1993 IF_ADDR_RUNLOCK(ifp);
1994
1995 return ((struct in6_ifaddr *)ifa);
1996 }
1997
1998 /*
1999 * Find a link-local scoped address on ifp and return it if any.
2000 */
2001 struct in6_ifaddr *
in6ifa_llaonifp(struct ifnet * ifp)2002 in6ifa_llaonifp(struct ifnet *ifp)
2003 {
2004 struct sockaddr_in6 *sin6;
2005 struct ifaddr *ifa;
2006
2007 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2008 return (NULL);
2009 if_addr_rlock(ifp);
2010 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2011 if (ifa->ifa_addr->sa_family != AF_INET6)
2012 continue;
2013 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2014 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
2015 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
2016 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
2017 break;
2018 }
2019 if_addr_runlock(ifp);
2020
2021 return ((struct in6_ifaddr *)ifa);
2022 }
2023
2024 /*
2025 * Convert IP6 address to printable (loggable) representation. Caller
2026 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
2027 */
2028 static char digits[] = "0123456789abcdef";
2029 char *
ip6_sprintf(char * ip6buf,const struct in6_addr * addr)2030 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
2031 {
2032 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
2033 char *cp;
2034 const u_int16_t *a = (const u_int16_t *)addr;
2035 const u_int8_t *d;
2036 int dcolon = 0, zero = 0;
2037
2038 cp = ip6buf;
2039
2040 for (i = 0; i < 8; i++) {
2041 if (*(a + i) == 0) {
2042 cnt++;
2043 if (cnt == 1)
2044 idx = i;
2045 }
2046 else if (maxcnt < cnt) {
2047 maxcnt = cnt;
2048 index = idx;
2049 cnt = 0;
2050 }
2051 }
2052 if (maxcnt < cnt) {
2053 maxcnt = cnt;
2054 index = idx;
2055 }
2056
2057 for (i = 0; i < 8; i++) {
2058 if (dcolon == 1) {
2059 if (*a == 0) {
2060 if (i == 7)
2061 *cp++ = ':';
2062 a++;
2063 continue;
2064 } else
2065 dcolon = 2;
2066 }
2067 if (*a == 0) {
2068 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2069 if (i == 0)
2070 *cp++ = ':';
2071 *cp++ = ':';
2072 dcolon = 1;
2073 } else {
2074 *cp++ = '0';
2075 *cp++ = ':';
2076 }
2077 a++;
2078 continue;
2079 }
2080 d = (const u_char *)a;
2081 /* Try to eliminate leading zeros in printout like in :0001. */
2082 zero = 1;
2083 *cp = digits[*d >> 4];
2084 if (*cp != '0') {
2085 zero = 0;
2086 cp++;
2087 }
2088 *cp = digits[*d++ & 0xf];
2089 if (zero == 0 || (*cp != '0')) {
2090 zero = 0;
2091 cp++;
2092 }
2093 *cp = digits[*d >> 4];
2094 if (zero == 0 || (*cp != '0')) {
2095 zero = 0;
2096 cp++;
2097 }
2098 *cp++ = digits[*d & 0xf];
2099 *cp++ = ':';
2100 a++;
2101 }
2102 *--cp = '\0';
2103 return (ip6buf);
2104 }
2105
2106 int
in6_localaddr(struct in6_addr * in6)2107 in6_localaddr(struct in6_addr *in6)
2108 {
2109 struct in6_ifaddr *ia;
2110
2111 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2112 return 1;
2113
2114 IN6_IFADDR_RLOCK();
2115 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2116 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2117 &ia->ia_prefixmask.sin6_addr)) {
2118 IN6_IFADDR_RUNLOCK();
2119 return 1;
2120 }
2121 }
2122 IN6_IFADDR_RUNLOCK();
2123
2124 return (0);
2125 }
2126
2127 /*
2128 * Return 1 if an internet address is for the local host and configured
2129 * on one of its interfaces.
2130 */
2131 int
in6_localip(struct in6_addr * in6)2132 in6_localip(struct in6_addr *in6)
2133 {
2134 struct in6_ifaddr *ia;
2135
2136 IN6_IFADDR_RLOCK();
2137 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
2138 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2139 IN6_IFADDR_RUNLOCK();
2140 return (1);
2141 }
2142 }
2143 IN6_IFADDR_RUNLOCK();
2144 return (0);
2145 }
2146
2147 int
in6_is_addr_deprecated(struct sockaddr_in6 * sa6)2148 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2149 {
2150 struct in6_ifaddr *ia;
2151
2152 IN6_IFADDR_RLOCK();
2153 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
2154 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
2155 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2156 IN6_IFADDR_RUNLOCK();
2157 return (1); /* true */
2158 }
2159 break;
2160 }
2161 }
2162 IN6_IFADDR_RUNLOCK();
2163
2164 return (0); /* false */
2165 }
2166
2167 /*
2168 * return length of part which dst and src are equal
2169 * hard coding...
2170 */
2171 int
in6_matchlen(struct in6_addr * src,struct in6_addr * dst)2172 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2173 {
2174 int match = 0;
2175 u_char *s = (u_char *)src, *d = (u_char *)dst;
2176 u_char *lim = s + 16, r;
2177
2178 while (s < lim)
2179 if ((r = (*d++ ^ *s++)) != 0) {
2180 while (r < 128) {
2181 match++;
2182 r <<= 1;
2183 }
2184 break;
2185 } else
2186 match += 8;
2187 return match;
2188 }
2189
2190 /* XXX: to be scope conscious */
2191 int
in6_are_prefix_equal(struct in6_addr * p1,struct in6_addr * p2,int len)2192 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2193 {
2194 int bytelen, bitlen;
2195
2196 /* sanity check */
2197 if (0 > len || len > 128) {
2198 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2199 len);
2200 return (0);
2201 }
2202
2203 bytelen = len / 8;
2204 bitlen = len % 8;
2205
2206 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2207 return (0);
2208 if (bitlen != 0 &&
2209 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2210 p2->s6_addr[bytelen] >> (8 - bitlen))
2211 return (0);
2212
2213 return (1);
2214 }
2215
2216 void
in6_prefixlen2mask(struct in6_addr * maskp,int len)2217 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2218 {
2219 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2220 int bytelen, bitlen, i;
2221
2222 /* sanity check */
2223 if (0 > len || len > 128) {
2224 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2225 len);
2226 return;
2227 }
2228
2229 bzero(maskp, sizeof(*maskp));
2230 bytelen = len / 8;
2231 bitlen = len % 8;
2232 for (i = 0; i < bytelen; i++)
2233 maskp->s6_addr[i] = 0xff;
2234 if (bitlen)
2235 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2236 }
2237
2238 /*
2239 * return the best address out of the same scope. if no address was
2240 * found, return the first valid address from designated IF.
2241 */
2242 struct in6_ifaddr *
in6_ifawithifp(struct ifnet * ifp,struct in6_addr * dst)2243 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2244 {
2245 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2246 struct ifaddr *ifa;
2247 struct in6_ifaddr *besta = 0;
2248 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2249
2250 dep[0] = dep[1] = NULL;
2251
2252 /*
2253 * We first look for addresses in the same scope.
2254 * If there is one, return it.
2255 * If two or more, return one which matches the dst longest.
2256 * If none, return one of global addresses assigned other ifs.
2257 */
2258 IF_ADDR_RLOCK(ifp);
2259 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2260 if (ifa->ifa_addr->sa_family != AF_INET6)
2261 continue;
2262 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2263 continue; /* XXX: is there any case to allow anycast? */
2264 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2265 continue; /* don't use this interface */
2266 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2267 continue;
2268 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2269 if (V_ip6_use_deprecated)
2270 dep[0] = (struct in6_ifaddr *)ifa;
2271 continue;
2272 }
2273
2274 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2275 /*
2276 * call in6_matchlen() as few as possible
2277 */
2278 if (besta) {
2279 if (blen == -1)
2280 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2281 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2282 if (tlen > blen) {
2283 blen = tlen;
2284 besta = (struct in6_ifaddr *)ifa;
2285 }
2286 } else
2287 besta = (struct in6_ifaddr *)ifa;
2288 }
2289 }
2290 if (besta) {
2291 ifa_ref(&besta->ia_ifa);
2292 IF_ADDR_RUNLOCK(ifp);
2293 return (besta);
2294 }
2295
2296 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2297 if (ifa->ifa_addr->sa_family != AF_INET6)
2298 continue;
2299 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2300 continue; /* XXX: is there any case to allow anycast? */
2301 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2302 continue; /* don't use this interface */
2303 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2304 continue;
2305 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2306 if (V_ip6_use_deprecated)
2307 dep[1] = (struct in6_ifaddr *)ifa;
2308 continue;
2309 }
2310
2311 if (ifa != NULL)
2312 ifa_ref(ifa);
2313 IF_ADDR_RUNLOCK(ifp);
2314 return (struct in6_ifaddr *)ifa;
2315 }
2316
2317 /* use the last-resort values, that are, deprecated addresses */
2318 if (dep[0]) {
2319 ifa_ref((struct ifaddr *)dep[0]);
2320 IF_ADDR_RUNLOCK(ifp);
2321 return dep[0];
2322 }
2323 if (dep[1]) {
2324 ifa_ref((struct ifaddr *)dep[1]);
2325 IF_ADDR_RUNLOCK(ifp);
2326 return dep[1];
2327 }
2328
2329 IF_ADDR_RUNLOCK(ifp);
2330 return NULL;
2331 }
2332
2333 /*
2334 * perform DAD when interface becomes IFF_UP.
2335 */
2336 void
in6_if_up(struct ifnet * ifp)2337 in6_if_up(struct ifnet *ifp)
2338 {
2339 struct ifaddr *ifa;
2340 struct in6_ifaddr *ia;
2341
2342 IF_ADDR_RLOCK(ifp);
2343 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2344 if (ifa->ifa_addr->sa_family != AF_INET6)
2345 continue;
2346 ia = (struct in6_ifaddr *)ifa;
2347 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2348 /*
2349 * The TENTATIVE flag was likely set by hand
2350 * beforehand, implicitly indicating the need for DAD.
2351 * We may be able to skip the random delay in this
2352 * case, but we impose delays just in case.
2353 */
2354 nd6_dad_start(ifa,
2355 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2356 }
2357 }
2358 IF_ADDR_RUNLOCK(ifp);
2359
2360 /*
2361 * special cases, like 6to4, are handled in in6_ifattach
2362 */
2363 in6_ifattach(ifp, NULL);
2364 }
2365
2366 int
in6if_do_dad(struct ifnet * ifp)2367 in6if_do_dad(struct ifnet *ifp)
2368 {
2369 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2370 return (0);
2371
2372 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
2373 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
2374 return (0);
2375
2376 switch (ifp->if_type) {
2377 #ifdef IFT_DUMMY
2378 case IFT_DUMMY:
2379 #endif
2380 case IFT_FAITH:
2381 /*
2382 * These interfaces do not have the IFF_LOOPBACK flag,
2383 * but loop packets back. We do not have to do DAD on such
2384 * interfaces. We should even omit it, because loop-backed
2385 * NS would confuse the DAD procedure.
2386 */
2387 return (0);
2388 default:
2389 /*
2390 * Our DAD routine requires the interface up and running.
2391 * However, some interfaces can be up before the RUNNING
2392 * status. Additionaly, users may try to assign addresses
2393 * before the interface becomes up (or running).
2394 * We simply skip DAD in such a case as a work around.
2395 * XXX: we should rather mark "tentative" on such addresses,
2396 * and do DAD after the interface becomes ready.
2397 */
2398 if (!((ifp->if_flags & IFF_UP) &&
2399 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2400 return (0);
2401
2402 return (1);
2403 }
2404 }
2405
2406 /*
2407 * Calculate max IPv6 MTU through all the interfaces and store it
2408 * to in6_maxmtu.
2409 */
2410 void
in6_setmaxmtu(void)2411 in6_setmaxmtu(void)
2412 {
2413 unsigned long maxmtu = 0;
2414 struct ifnet *ifp;
2415
2416 IFNET_RLOCK_NOSLEEP();
2417 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2418 /* this function can be called during ifnet initialization */
2419 if (!ifp->if_afdata[AF_INET6])
2420 continue;
2421 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2422 IN6_LINKMTU(ifp) > maxmtu)
2423 maxmtu = IN6_LINKMTU(ifp);
2424 }
2425 IFNET_RUNLOCK_NOSLEEP();
2426 if (maxmtu) /* update only when maxmtu is positive */
2427 V_in6_maxmtu = maxmtu;
2428 }
2429
2430 /*
2431 * Provide the length of interface identifiers to be used for the link attached
2432 * to the given interface. The length should be defined in "IPv6 over
2433 * xxx-link" document. Note that address architecture might also define
2434 * the length for a particular set of address prefixes, regardless of the
2435 * link type. As clarified in rfc2462bis, those two definitions should be
2436 * consistent, and those really are as of August 2004.
2437 */
2438 int
in6_if2idlen(struct ifnet * ifp)2439 in6_if2idlen(struct ifnet *ifp)
2440 {
2441 switch (ifp->if_type) {
2442 case IFT_ETHER: /* RFC2464 */
2443 #ifdef IFT_PROPVIRTUAL
2444 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2445 #endif
2446 #ifdef IFT_L2VLAN
2447 case IFT_L2VLAN: /* ditto */
2448 #endif
2449 #ifdef IFT_IEEE80211
2450 case IFT_IEEE80211: /* ditto */
2451 #endif
2452 #ifdef IFT_MIP
2453 case IFT_MIP: /* ditto */
2454 #endif
2455 case IFT_INFINIBAND:
2456 return (64);
2457 case IFT_FDDI: /* RFC2467 */
2458 return (64);
2459 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2460 return (64);
2461 case IFT_PPP: /* RFC2472 */
2462 return (64);
2463 case IFT_ARCNET: /* RFC2497 */
2464 return (64);
2465 case IFT_FRELAY: /* RFC2590 */
2466 return (64);
2467 case IFT_IEEE1394: /* RFC3146 */
2468 return (64);
2469 case IFT_GIF:
2470 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2471 case IFT_LOOP:
2472 return (64); /* XXX: is this really correct? */
2473 default:
2474 /*
2475 * Unknown link type:
2476 * It might be controversial to use the today's common constant
2477 * of 64 for these cases unconditionally. For full compliance,
2478 * we should return an error in this case. On the other hand,
2479 * if we simply miss the standard for the link type or a new
2480 * standard is defined for a new link type, the IFID length
2481 * is very likely to be the common constant. As a compromise,
2482 * we always use the constant, but make an explicit notice
2483 * indicating the "unknown" case.
2484 */
2485 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2486 return (64);
2487 }
2488 }
2489
2490 #include <sys/sysctl.h>
2491
2492 struct in6_llentry {
2493 struct llentry base;
2494 struct sockaddr_in6 l3_addr6;
2495 };
2496
2497 /*
2498 * Deletes an address from the address table.
2499 * This function is called by the timer functions
2500 * such as arptimer() and nd6_llinfo_timer(), and
2501 * the caller does the locking.
2502 */
2503 static void
in6_lltable_free(struct lltable * llt,struct llentry * lle)2504 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2505 {
2506 LLE_WUNLOCK(lle);
2507 LLE_LOCK_DESTROY(lle);
2508 free(lle, M_LLTABLE);
2509 }
2510
2511 static struct llentry *
in6_lltable_new(const struct sockaddr * l3addr,u_int flags)2512 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2513 {
2514 struct in6_llentry *lle;
2515
2516 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2517 if (lle == NULL) /* NB: caller generates msg */
2518 return NULL;
2519
2520 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2521 lle->base.lle_refcnt = 1;
2522 lle->base.lle_free = in6_lltable_free;
2523 LLE_LOCK_INIT(&lle->base);
2524 callout_init(&lle->base.ln_timer_ch, 1);
2525
2526 return (&lle->base);
2527 }
2528
2529 static void
in6_lltable_prefix_free(struct lltable * llt,const struct sockaddr * prefix,const struct sockaddr * mask,u_int flags)2530 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2531 const struct sockaddr *mask, u_int flags)
2532 {
2533 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2534 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2535 struct llentry *lle, *next;
2536 int i;
2537
2538 /*
2539 * (flags & LLE_STATIC) means deleting all entries
2540 * including static ND6 entries.
2541 */
2542 IF_AFDATA_WLOCK(llt->llt_ifp);
2543 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2544 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2545 if (IN6_ARE_MASKED_ADDR_EQUAL(
2546 &satosin6(L3_ADDR(lle))->sin6_addr,
2547 &pfx->sin6_addr, &msk->sin6_addr) &&
2548 ((flags & LLE_STATIC) ||
2549 !(lle->la_flags & LLE_STATIC))) {
2550 LLE_WLOCK(lle);
2551 if (callout_stop(&lle->la_timer))
2552 LLE_REMREF(lle);
2553 llentry_free(lle);
2554 }
2555 }
2556 }
2557 IF_AFDATA_WUNLOCK(llt->llt_ifp);
2558 }
2559
2560 static int
in6_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)2561 in6_lltable_rtcheck(struct ifnet *ifp,
2562 u_int flags,
2563 const struct sockaddr *l3addr)
2564 {
2565 struct rtentry *rt;
2566 char ip6buf[INET6_ADDRSTRLEN];
2567
2568 KASSERT(l3addr->sa_family == AF_INET6,
2569 ("sin_family %d", l3addr->sa_family));
2570
2571 /* Our local addresses are always only installed on the default FIB. */
2572 /* XXX rtalloc1 should take a const param */
2573 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2574 RT_DEFAULT_FIB);
2575 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2576 struct ifaddr *ifa;
2577 /*
2578 * Create an ND6 cache for an IPv6 neighbor
2579 * that is not covered by our own prefix.
2580 */
2581 /* XXX ifaof_ifpforaddr should take a const param */
2582 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2583 if (ifa != NULL) {
2584 ifa_free(ifa);
2585 if (rt != NULL)
2586 RTFREE_LOCKED(rt);
2587 return 0;
2588 }
2589 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2590 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2591 if (rt != NULL)
2592 RTFREE_LOCKED(rt);
2593 return EINVAL;
2594 }
2595 RTFREE_LOCKED(rt);
2596 return 0;
2597 }
2598
2599 static struct llentry *
in6_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2600 in6_lltable_lookup(struct lltable *llt, u_int flags,
2601 const struct sockaddr *l3addr)
2602 {
2603 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2604 struct ifnet *ifp = llt->llt_ifp;
2605 struct llentry *lle;
2606 struct llentries *lleh;
2607 u_int hashkey;
2608
2609 IF_AFDATA_LOCK_ASSERT(ifp);
2610 KASSERT(l3addr->sa_family == AF_INET6,
2611 ("sin_family %d", l3addr->sa_family));
2612
2613 hashkey = sin6->sin6_addr.s6_addr32[3];
2614 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2615 LIST_FOREACH(lle, lleh, lle_next) {
2616 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2617 if (lle->la_flags & LLE_DELETED)
2618 continue;
2619 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2620 sizeof(struct in6_addr)) == 0)
2621 break;
2622 }
2623
2624 if (lle == NULL) {
2625 if (!(flags & LLE_CREATE))
2626 return (NULL);
2627 IF_AFDATA_WLOCK_ASSERT(ifp);
2628 /*
2629 * A route that covers the given address must have
2630 * been installed 1st because we are doing a resolution,
2631 * verify this.
2632 */
2633 if (!(flags & LLE_IFADDR) &&
2634 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2635 return NULL;
2636
2637 lle = in6_lltable_new(l3addr, flags);
2638 if (lle == NULL) {
2639 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2640 return NULL;
2641 }
2642 lle->la_flags = flags & ~LLE_CREATE;
2643 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2644 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2645 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2646 }
2647
2648 lle->lle_tbl = llt;
2649 lle->lle_head = lleh;
2650 lle->la_flags |= LLE_LINKED;
2651 LIST_INSERT_HEAD(lleh, lle, lle_next);
2652 } else if (flags & LLE_DELETE) {
2653 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2654 LLE_WLOCK(lle);
2655 lle->la_flags |= LLE_DELETED;
2656 #ifdef DIAGNOSTIC
2657 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2658 #endif
2659 if ((lle->la_flags &
2660 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2661 llentry_free(lle);
2662 else
2663 LLE_WUNLOCK(lle);
2664 }
2665 lle = (void *)-1;
2666 }
2667 if (LLE_IS_VALID(lle)) {
2668 if (flags & LLE_EXCLUSIVE)
2669 LLE_WLOCK(lle);
2670 else
2671 LLE_RLOCK(lle);
2672 }
2673 return (lle);
2674 }
2675
2676 static int
in6_lltable_dump(struct lltable * llt,struct sysctl_req * wr)2677 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2678 {
2679 struct ifnet *ifp = llt->llt_ifp;
2680 struct llentry *lle;
2681 /* XXX stack use */
2682 struct {
2683 struct rt_msghdr rtm;
2684 struct sockaddr_in6 sin6;
2685 /*
2686 * ndp.c assumes that sdl is word aligned
2687 */
2688 #ifdef __LP64__
2689 uint32_t pad;
2690 #endif
2691 struct sockaddr_dl sdl;
2692 } ndpc;
2693 int i, error;
2694
2695 if (ifp->if_flags & IFF_LOOPBACK)
2696 return 0;
2697
2698 LLTABLE_LOCK_ASSERT();
2699
2700 error = 0;
2701 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2702 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2703 struct sockaddr_dl *sdl;
2704
2705 /* skip deleted or invalid entries */
2706 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2707 continue;
2708 /* Skip if jailed and not a valid IP of the prison. */
2709 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2710 continue;
2711 /*
2712 * produce a msg made of:
2713 * struct rt_msghdr;
2714 * struct sockaddr_in6 (IPv6)
2715 * struct sockaddr_dl;
2716 */
2717 bzero(&ndpc, sizeof(ndpc));
2718 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2719 ndpc.rtm.rtm_version = RTM_VERSION;
2720 ndpc.rtm.rtm_type = RTM_GET;
2721 ndpc.rtm.rtm_flags = RTF_UP;
2722 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2723 ndpc.sin6.sin6_family = AF_INET6;
2724 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2725 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2726 if (V_deembed_scopeid)
2727 sa6_recoverscope(&ndpc.sin6);
2728
2729 /* publish */
2730 if (lle->la_flags & LLE_PUB)
2731 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2732
2733 sdl = &ndpc.sdl;
2734 sdl->sdl_family = AF_LINK;
2735 sdl->sdl_len = sizeof(*sdl);
2736 sdl->sdl_alen = ifp->if_addrlen;
2737 sdl->sdl_index = ifp->if_index;
2738 sdl->sdl_type = ifp->if_type;
2739 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2740 ndpc.rtm.rtm_rmx.rmx_expire =
2741 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2742 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2743 if (lle->la_flags & LLE_STATIC)
2744 ndpc.rtm.rtm_flags |= RTF_STATIC;
2745 ndpc.rtm.rtm_index = ifp->if_index;
2746 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2747 if (error)
2748 break;
2749 }
2750 }
2751 return error;
2752 }
2753
2754 void *
in6_domifattach(struct ifnet * ifp)2755 in6_domifattach(struct ifnet *ifp)
2756 {
2757 struct in6_ifextra *ext;
2758
2759 /* There are not IPv6-capable interfaces. */
2760 switch (ifp->if_type) {
2761 case IFT_PFLOG:
2762 case IFT_PFSYNC:
2763 case IFT_USB:
2764 return (NULL);
2765 }
2766 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2767 bzero(ext, sizeof(*ext));
2768
2769 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2770 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2771 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2772 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2773
2774 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2775 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2776 M_WAITOK);
2777 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2778 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2779
2780 ext->nd_ifinfo = nd6_ifattach(ifp);
2781 ext->scope6_id = scope6_ifattach(ifp);
2782 ext->lltable = lltable_init(ifp, AF_INET6);
2783 if (ext->lltable != NULL) {
2784 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2785 ext->lltable->llt_lookup = in6_lltable_lookup;
2786 ext->lltable->llt_dump = in6_lltable_dump;
2787 }
2788
2789 ext->mld_ifinfo = mld_domifattach(ifp);
2790
2791 return ext;
2792 }
2793
2794 void
in6_domifdetach(struct ifnet * ifp,void * aux)2795 in6_domifdetach(struct ifnet *ifp, void *aux)
2796 {
2797 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2798
2799 mld_domifdetach(ifp);
2800 scope6_ifdetach(ext->scope6_id);
2801 nd6_ifdetach(ext->nd_ifinfo);
2802 lltable_free(ext->lltable);
2803 COUNTER_ARRAY_FREE(ext->in6_ifstat,
2804 sizeof(struct in6_ifstat) / sizeof(uint64_t));
2805 free(ext->in6_ifstat, M_IFADDR);
2806 COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2807 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2808 free(ext->icmp6_ifstat, M_IFADDR);
2809 free(ext, M_IFADDR);
2810 }
2811
2812 /*
2813 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2814 * v4 mapped addr or v4 compat addr
2815 */
2816 void
in6_sin6_2_sin(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2817 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2818 {
2819
2820 bzero(sin, sizeof(*sin));
2821 sin->sin_len = sizeof(struct sockaddr_in);
2822 sin->sin_family = AF_INET;
2823 sin->sin_port = sin6->sin6_port;
2824 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2825 }
2826
2827 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2828 void
in6_sin_2_v4mapsin6(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2829 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2830 {
2831 bzero(sin6, sizeof(*sin6));
2832 sin6->sin6_len = sizeof(struct sockaddr_in6);
2833 sin6->sin6_family = AF_INET6;
2834 sin6->sin6_port = sin->sin_port;
2835 sin6->sin6_addr.s6_addr32[0] = 0;
2836 sin6->sin6_addr.s6_addr32[1] = 0;
2837 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2838 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2839 }
2840
2841 /* Convert sockaddr_in6 into sockaddr_in. */
2842 void
in6_sin6_2_sin_in_sock(struct sockaddr * nam)2843 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2844 {
2845 struct sockaddr_in *sin_p;
2846 struct sockaddr_in6 sin6;
2847
2848 /*
2849 * Save original sockaddr_in6 addr and convert it
2850 * to sockaddr_in.
2851 */
2852 sin6 = *(struct sockaddr_in6 *)nam;
2853 sin_p = (struct sockaddr_in *)nam;
2854 in6_sin6_2_sin(sin_p, &sin6);
2855 }
2856
2857 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2858 void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr ** nam)2859 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2860 {
2861 struct sockaddr_in *sin_p;
2862 struct sockaddr_in6 *sin6_p;
2863
2864 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2865 sin_p = (struct sockaddr_in *)*nam;
2866 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2867 free(*nam, M_SONAME);
2868 *nam = (struct sockaddr *)sin6_p;
2869 }
2870