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: stable/10/sys/netinet6/in6.c 303458 2016-07-28 20:08:01Z sbruno $");
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 SIOCGNBRINFO_IN6:
327 case SIOCGDEFIFACE_IN6:
328 return (nd6_ioctl(cmd, data, ifp));
329
330 #ifdef COMPAT_FREEBSD32
331 case SIOCGDEFIFACE32_IN6:
332 {
333 struct in6_ndifreq ndif;
334 struct in6_ndifreq32 *ndif32;
335
336 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
337 ifp);
338 if (error)
339 return (error);
340 ndif32 = (struct in6_ndifreq32 *)data;
341 ndif32->ifindex = ndif.ifindex;
342 return (0);
343 }
344 #endif
345 }
346
347 switch (cmd) {
348 case SIOCSIFPREFIX_IN6:
349 case SIOCDIFPREFIX_IN6:
350 case SIOCAIFPREFIX_IN6:
351 case SIOCCIFPREFIX_IN6:
352 case SIOCSGIFPREFIX_IN6:
353 case SIOCGIFPREFIX_IN6:
354 log(LOG_NOTICE,
355 "prefix ioctls are now invalidated. "
356 "please use ifconfig.\n");
357 return (EOPNOTSUPP);
358 }
359
360 switch (cmd) {
361 case SIOCSSCOPE6:
362 if (td != NULL) {
363 error = priv_check(td, PRIV_NETINET_SCOPE6);
364 if (error)
365 return (error);
366 }
367 /* FALLTHROUGH */
368 case SIOCGSCOPE6:
369 case SIOCGSCOPE6DEF:
370 return (scope6_ioctl(cmd, data, ifp));
371 }
372
373 switch (cmd) {
374 case SIOCALIFADDR:
375 if (td != NULL) {
376 error = priv_check(td, PRIV_NET_ADDIFADDR);
377 if (error)
378 return (error);
379 }
380 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
381
382 case SIOCDLIFADDR:
383 if (td != NULL) {
384 error = priv_check(td, PRIV_NET_DELIFADDR);
385 if (error)
386 return (error);
387 }
388 /* FALLTHROUGH */
389 case SIOCGLIFADDR:
390 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
391 }
392
393 /*
394 * Find address for this interface, if it exists.
395 *
396 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
397 * only, and used the first interface address as the target of other
398 * operations (without checking ifra_addr). This was because netinet
399 * code/API assumed at most 1 interface address per interface.
400 * Since IPv6 allows a node to assign multiple addresses
401 * on a single interface, we almost always look and check the
402 * presence of ifra_addr, and reject invalid ones here.
403 * It also decreases duplicated code among SIOC*_IN6 operations.
404 */
405 switch (cmd) {
406 case SIOCAIFADDR_IN6:
407 case SIOCSIFPHYADDR_IN6:
408 sa6 = &ifra->ifra_addr;
409 break;
410 case SIOCSIFADDR_IN6:
411 case SIOCGIFADDR_IN6:
412 case SIOCSIFDSTADDR_IN6:
413 case SIOCSIFNETMASK_IN6:
414 case SIOCGIFDSTADDR_IN6:
415 case SIOCGIFNETMASK_IN6:
416 case SIOCDIFADDR_IN6:
417 case SIOCGIFPSRCADDR_IN6:
418 case SIOCGIFPDSTADDR_IN6:
419 case SIOCGIFAFLAG_IN6:
420 case SIOCSNDFLUSH_IN6:
421 case SIOCSPFXFLUSH_IN6:
422 case SIOCSRTRFLUSH_IN6:
423 case SIOCGIFALIFETIME_IN6:
424 case SIOCSIFALIFETIME_IN6:
425 case SIOCGIFSTAT_IN6:
426 case SIOCGIFSTAT_ICMP6:
427 sa6 = &ifr->ifr_addr;
428 break;
429 case SIOCSIFADDR:
430 case SIOCSIFBRDADDR:
431 case SIOCSIFDSTADDR:
432 case SIOCSIFNETMASK:
433 /*
434 * Although we should pass any non-INET6 ioctl requests
435 * down to driver, we filter some legacy INET requests.
436 * Drivers trust SIOCSIFADDR et al to come from an already
437 * privileged layer, and do not perform any credentials
438 * checks or input validation.
439 */
440 return (EINVAL);
441 default:
442 sa6 = NULL;
443 break;
444 }
445 if (sa6 && sa6->sin6_family == AF_INET6) {
446 if (sa6->sin6_scope_id != 0)
447 error = sa6_embedscope(sa6, 0);
448 else
449 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
450 if (error != 0)
451 return (error);
452 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
453 &sa6->sin6_addr)) != 0)
454 return (error);
455 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
456 } else
457 ia = NULL;
458
459 switch (cmd) {
460 case SIOCSIFADDR_IN6:
461 case SIOCSIFDSTADDR_IN6:
462 case SIOCSIFNETMASK_IN6:
463 /*
464 * Since IPv6 allows a node to assign multiple addresses
465 * on a single interface, SIOCSIFxxx ioctls are deprecated.
466 */
467 /* we decided to obsolete this command (20000704) */
468 error = EINVAL;
469 goto out;
470
471 case SIOCDIFADDR_IN6:
472 /*
473 * for IPv4, we look for existing in_ifaddr here to allow
474 * "ifconfig if0 delete" to remove the first IPv4 address on
475 * the interface. For IPv6, as the spec allows multiple
476 * interface address from the day one, we consider "remove the
477 * first one" semantics to be not preferable.
478 */
479 if (ia == NULL) {
480 error = EADDRNOTAVAIL;
481 goto out;
482 }
483 /* FALLTHROUGH */
484 case SIOCAIFADDR_IN6:
485 /*
486 * We always require users to specify a valid IPv6 address for
487 * the corresponding operation.
488 */
489 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
490 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
491 error = EAFNOSUPPORT;
492 goto out;
493 }
494
495 if (td != NULL) {
496 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
497 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
498 if (error)
499 goto out;
500 }
501 /* FALLTHROUGH */
502 case SIOCGIFSTAT_IN6:
503 case SIOCGIFSTAT_ICMP6:
504 if (ifp->if_afdata[AF_INET6] == NULL) {
505 error = EPFNOSUPPORT;
506 goto out;
507 }
508 break;
509
510 case SIOCGIFADDR_IN6:
511 /* This interface is basically deprecated. use SIOCGIFCONF. */
512 /* FALLTHROUGH */
513 case SIOCGIFAFLAG_IN6:
514 case SIOCGIFNETMASK_IN6:
515 case SIOCGIFDSTADDR_IN6:
516 case SIOCGIFALIFETIME_IN6:
517 /* must think again about its semantics */
518 if (ia == NULL) {
519 error = EADDRNOTAVAIL;
520 goto out;
521 }
522 break;
523
524 case SIOCSIFALIFETIME_IN6:
525 {
526 struct in6_addrlifetime *lt;
527
528 if (td != NULL) {
529 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
530 if (error)
531 goto out;
532 }
533 if (ia == NULL) {
534 error = EADDRNOTAVAIL;
535 goto out;
536 }
537 /* sanity for overflow - beware unsigned */
538 lt = &ifr->ifr_ifru.ifru_lifetime;
539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
540 lt->ia6t_vltime + time_uptime < time_uptime) {
541 error = EINVAL;
542 goto out;
543 }
544 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
545 lt->ia6t_pltime + time_uptime < time_uptime) {
546 error = EINVAL;
547 goto out;
548 }
549 break;
550 }
551 }
552
553 switch (cmd) {
554 case SIOCGIFADDR_IN6:
555 ifr->ifr_addr = ia->ia_addr;
556 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
557 goto out;
558 break;
559
560 case SIOCGIFDSTADDR_IN6:
561 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
562 error = EINVAL;
563 goto out;
564 }
565 /*
566 * XXX: should we check if ifa_dstaddr is NULL and return
567 * an error?
568 */
569 ifr->ifr_dstaddr = ia->ia_dstaddr;
570 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
571 goto out;
572 break;
573
574 case SIOCGIFNETMASK_IN6:
575 ifr->ifr_addr = ia->ia_prefixmask;
576 break;
577
578 case SIOCGIFAFLAG_IN6:
579 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
580 break;
581
582 case SIOCGIFSTAT_IN6:
583 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
584 ifp->if_afdata[AF_INET6])->in6_ifstat,
585 &ifr->ifr_ifru.ifru_stat,
586 sizeof(struct in6_ifstat) / sizeof(uint64_t));
587 break;
588
589 case SIOCGIFSTAT_ICMP6:
590 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
591 ifp->if_afdata[AF_INET6])->icmp6_ifstat,
592 &ifr->ifr_ifru.ifru_icmp6stat,
593 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
594 break;
595
596 case SIOCGIFALIFETIME_IN6:
597 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
598 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
599 time_t maxexpire;
600 struct in6_addrlifetime *retlt =
601 &ifr->ifr_ifru.ifru_lifetime;
602
603 /*
604 * XXX: adjust expiration time assuming time_t is
605 * signed.
606 */
607 maxexpire = (-1) &
608 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
609 if (ia->ia6_lifetime.ia6t_vltime <
610 maxexpire - ia->ia6_updatetime) {
611 retlt->ia6t_expire = ia->ia6_updatetime +
612 ia->ia6_lifetime.ia6t_vltime;
613 } else
614 retlt->ia6t_expire = maxexpire;
615 }
616 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
617 time_t maxexpire;
618 struct in6_addrlifetime *retlt =
619 &ifr->ifr_ifru.ifru_lifetime;
620
621 /*
622 * XXX: adjust expiration time assuming time_t is
623 * signed.
624 */
625 maxexpire = (-1) &
626 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
627 if (ia->ia6_lifetime.ia6t_pltime <
628 maxexpire - ia->ia6_updatetime) {
629 retlt->ia6t_preferred = ia->ia6_updatetime +
630 ia->ia6_lifetime.ia6t_pltime;
631 } else
632 retlt->ia6t_preferred = maxexpire;
633 }
634 break;
635
636 case SIOCSIFALIFETIME_IN6:
637 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
638 /* for sanity */
639 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
640 ia->ia6_lifetime.ia6t_expire =
641 time_uptime + ia->ia6_lifetime.ia6t_vltime;
642 } else
643 ia->ia6_lifetime.ia6t_expire = 0;
644 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
645 ia->ia6_lifetime.ia6t_preferred =
646 time_uptime + ia->ia6_lifetime.ia6t_pltime;
647 } else
648 ia->ia6_lifetime.ia6t_preferred = 0;
649 break;
650
651 case SIOCAIFADDR_IN6:
652 {
653 int i;
654 struct nd_prefixctl pr0;
655 struct nd_prefix *pr;
656
657 /*
658 * first, make or update the interface address structure,
659 * and link it to the list.
660 */
661 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
662 goto out;
663 if (ia != NULL)
664 ifa_free(&ia->ia_ifa);
665 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
666 == NULL) {
667 /*
668 * this can happen when the user specify the 0 valid
669 * lifetime.
670 */
671 break;
672 }
673
674 if (cmd == ocmd && ifra->ifra_vhid > 0) {
675 if (carp_attach_p != NULL)
676 error = (*carp_attach_p)(&ia->ia_ifa,
677 ifra->ifra_vhid);
678 else
679 error = EPROTONOSUPPORT;
680 if (error)
681 goto out;
682 else
683 carp_attached = 1;
684 }
685
686 /*
687 * then, make the prefix on-link on the interface.
688 * XXX: we'd rather create the prefix before the address, but
689 * we need at least one address to install the corresponding
690 * interface route, so we configure the address first.
691 */
692
693 /*
694 * convert mask to prefix length (prefixmask has already
695 * been validated in in6_update_ifa().
696 */
697 bzero(&pr0, sizeof(pr0));
698 pr0.ndpr_ifp = ifp;
699 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
700 NULL);
701 if (pr0.ndpr_plen == 128) {
702 /* we don't need to install a host route. */
703 goto aifaddr_out;
704 }
705 pr0.ndpr_prefix = ifra->ifra_addr;
706 /* apply the mask for safety. */
707 for (i = 0; i < 4; i++) {
708 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
709 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
710 }
711 /*
712 * XXX: since we don't have an API to set prefix (not address)
713 * lifetimes, we just use the same lifetimes as addresses.
714 * The (temporarily) installed lifetimes can be overridden by
715 * later advertised RAs (when accept_rtadv is non 0), which is
716 * an intended behavior.
717 */
718 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
719 pr0.ndpr_raf_auto =
720 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
721 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
722 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
723
724 /* add the prefix if not yet. */
725 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
726 /*
727 * nd6_prelist_add will install the corresponding
728 * interface route.
729 */
730 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
731 if (carp_attached)
732 (*carp_detach_p)(&ia->ia_ifa);
733 goto out;
734 }
735 }
736
737 /* relate the address to the prefix */
738 if (ia->ia6_ndpr == NULL) {
739 ia->ia6_ndpr = pr;
740 pr->ndpr_refcnt++;
741
742 /*
743 * If this is the first autoconf address from the
744 * prefix, create a temporary address as well
745 * (when required).
746 */
747 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
748 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
749 int e;
750 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
751 log(LOG_NOTICE, "in6_control: failed "
752 "to create a temporary address, "
753 "errno=%d\n", e);
754 }
755 }
756 }
757
758 /*
759 * this might affect the status of autoconfigured addresses,
760 * that is, this address might make other addresses detached.
761 */
762 pfxlist_onlink_check();
763 aifaddr_out:
764 if (error != 0 || ia == NULL)
765 break;
766 /*
767 * Try to clear the flag when a new IPv6 address is added
768 * onto an IFDISABLED interface and it succeeds.
769 */
770 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
771 struct in6_ndireq nd;
772
773 memset(&nd, 0, sizeof(nd));
774 nd.ndi.flags = ND_IFINFO(ifp)->flags;
775 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
776 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
777 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
778 "SIOCSIFINFO_FLAGS for -ifdisabled "
779 "failed.");
780 /*
781 * Ignore failure of clearing the flag intentionally.
782 * The failure means address duplication was detected.
783 */
784 }
785 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
786 break;
787 }
788
789 case SIOCDIFADDR_IN6:
790 {
791 struct nd_prefix *pr;
792
793 /*
794 * If the address being deleted is the only one that owns
795 * the corresponding prefix, expire the prefix as well.
796 * XXX: theoretically, we don't have to worry about such
797 * relationship, since we separate the address management
798 * and the prefix management. We do this, however, to provide
799 * as much backward compatibility as possible in terms of
800 * the ioctl operation.
801 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
802 */
803 pr = ia->ia6_ndpr;
804 in6_purgeaddr(&ia->ia_ifa);
805 if (pr && pr->ndpr_refcnt == 0)
806 prelist_remove(pr);
807 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
808 break;
809 }
810
811 default:
812 if (ifp->if_ioctl == NULL) {
813 error = EOPNOTSUPP;
814 goto out;
815 }
816 error = (*ifp->if_ioctl)(ifp, cmd, data);
817 goto out;
818 }
819
820 error = 0;
821 out:
822 if (ia != NULL)
823 ifa_free(&ia->ia_ifa);
824 return (error);
825 }
826
827
828 /*
829 * Join necessary multicast groups. Factored out from in6_update_ifa().
830 * This entire work should only be done once, for the default FIB.
831 */
832 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)833 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
834 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
835 {
836 char ip6buf[INET6_ADDRSTRLEN];
837 struct sockaddr_in6 mltaddr, mltmask;
838 struct in6_addr llsol;
839 struct in6_multi_mship *imm;
840 struct rtentry *rt;
841 int delay, error;
842
843 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
844
845 /* Join solicited multicast addr for new host id. */
846 bzero(&llsol, sizeof(struct in6_addr));
847 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
848 llsol.s6_addr32[1] = 0;
849 llsol.s6_addr32[2] = htonl(1);
850 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
851 llsol.s6_addr8[12] = 0xff;
852 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
853 /* XXX: should not happen */
854 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
855 goto cleanup;
856 }
857 delay = 0;
858 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
859 /*
860 * We need a random delay for DAD on the address being
861 * configured. It also means delaying transmission of the
862 * corresponding MLD report to avoid report collision.
863 * [RFC 4861, Section 6.3.7]
864 */
865 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
866 }
867 imm = in6_joingroup(ifp, &llsol, &error, delay);
868 if (imm == NULL) {
869 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
870 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
871 if_name(ifp), error));
872 goto cleanup;
873 }
874 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
875 *in6m_sol = imm->i6mm_maddr;
876
877 bzero(&mltmask, sizeof(mltmask));
878 mltmask.sin6_len = sizeof(struct sockaddr_in6);
879 mltmask.sin6_family = AF_INET6;
880 mltmask.sin6_addr = in6mask32;
881 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
882
883 /*
884 * Join link-local all-nodes address.
885 */
886 bzero(&mltaddr, sizeof(mltaddr));
887 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
888 mltaddr.sin6_family = AF_INET6;
889 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
890 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
891 goto cleanup; /* XXX: should not fail */
892
893 /*
894 * XXX: do we really need this automatic routes? We should probably
895 * reconsider this stuff. Most applications actually do not need the
896 * routes, since they usually specify the outgoing interface.
897 */
898 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
899 if (rt != NULL) {
900 /* XXX: only works in !SCOPEDROUTING case. */
901 if (memcmp(&mltaddr.sin6_addr,
902 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
903 MLTMASK_LEN)) {
904 RTFREE_LOCKED(rt);
905 rt = NULL;
906 }
907 }
908 if (rt == NULL) {
909 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
910 (struct sockaddr *)&ia->ia_addr,
911 (struct sockaddr *)&mltmask, RTF_UP,
912 (struct rtentry **)0, RT_DEFAULT_FIB);
913 if (error)
914 goto cleanup;
915 } else
916 RTFREE_LOCKED(rt);
917
918 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
919 if (imm == NULL) {
920 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
921 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
922 &mltaddr.sin6_addr), if_name(ifp), error));
923 goto cleanup;
924 }
925 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
926
927 /*
928 * Join node information group address.
929 */
930 delay = 0;
931 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
932 /*
933 * The spec does not say anything about delay for this group,
934 * but the same logic should apply.
935 */
936 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
937 }
938 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
939 /* XXX jinmei */
940 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
941 if (imm == NULL)
942 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
943 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
944 &mltaddr.sin6_addr), if_name(ifp), error));
945 /* XXX not very fatal, go on... */
946 else
947 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
948 }
949 if (V_icmp6_nodeinfo_oldmcprefix &&
950 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
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
961 /*
962 * Join interface-local all-nodes address.
963 * (ff01::1%ifN, and ff01::%ifN/32)
964 */
965 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
966 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
967 goto cleanup; /* XXX: should not fail */
968 /* XXX: again, do we really need the route? */
969 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
970 if (rt != NULL) {
971 if (memcmp(&mltaddr.sin6_addr,
972 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
973 MLTMASK_LEN)) {
974 RTFREE_LOCKED(rt);
975 rt = NULL;
976 }
977 }
978 if (rt == NULL) {
979 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
980 (struct sockaddr *)&ia->ia_addr,
981 (struct sockaddr *)&mltmask, RTF_UP,
982 (struct rtentry **)0, RT_DEFAULT_FIB);
983 if (error)
984 goto cleanup;
985 } else
986 RTFREE_LOCKED(rt);
987
988 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
989 if (imm == NULL) {
990 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
991 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
992 &mltaddr.sin6_addr), if_name(ifp), error));
993 goto cleanup;
994 }
995 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
996 #undef MLTMASK_LEN
997
998 cleanup:
999 return (error);
1000 }
1001
1002 /*
1003 * Update parameters of an IPv6 interface address.
1004 * If necessary, a new entry is created and linked into address chains.
1005 * This function is separated from in6_control().
1006 */
1007 int
in6_update_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags)1008 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1009 struct in6_ifaddr *ia, int flags)
1010 {
1011 int error = 0, hostIsNew = 0, plen = -1;
1012 struct sockaddr_in6 dst6;
1013 struct in6_addrlifetime *lt;
1014 struct in6_multi *in6m_sol;
1015 int delay;
1016 char ip6buf[INET6_ADDRSTRLEN];
1017
1018 /* Validate parameters */
1019 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1020 return (EINVAL);
1021
1022 /*
1023 * The destination address for a p2p link must have a family
1024 * of AF_UNSPEC or AF_INET6.
1025 */
1026 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1027 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1028 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1029 return (EAFNOSUPPORT);
1030 /*
1031 * validate ifra_prefixmask. don't check sin6_family, netmask
1032 * does not carry fields other than sin6_len.
1033 */
1034 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1035 return (EINVAL);
1036 /*
1037 * Because the IPv6 address architecture is classless, we require
1038 * users to specify a (non 0) prefix length (mask) for a new address.
1039 * We also require the prefix (when specified) mask is valid, and thus
1040 * reject a non-consecutive mask.
1041 */
1042 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1043 return (EINVAL);
1044 if (ifra->ifra_prefixmask.sin6_len != 0) {
1045 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1046 (u_char *)&ifra->ifra_prefixmask +
1047 ifra->ifra_prefixmask.sin6_len);
1048 if (plen <= 0)
1049 return (EINVAL);
1050 } else {
1051 /*
1052 * In this case, ia must not be NULL. We just use its prefix
1053 * length.
1054 */
1055 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1056 }
1057 /*
1058 * If the destination address on a p2p interface is specified,
1059 * and the address is a scoped one, validate/set the scope
1060 * zone identifier.
1061 */
1062 dst6 = ifra->ifra_dstaddr;
1063 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1064 (dst6.sin6_family == AF_INET6)) {
1065 struct in6_addr in6_tmp;
1066 u_int32_t zoneid;
1067
1068 in6_tmp = dst6.sin6_addr;
1069 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1070 return (EINVAL); /* XXX: should be impossible */
1071
1072 if (dst6.sin6_scope_id != 0) {
1073 if (dst6.sin6_scope_id != zoneid)
1074 return (EINVAL);
1075 } else /* user omit to specify the ID. */
1076 dst6.sin6_scope_id = zoneid;
1077
1078 /* convert into the internal form */
1079 if (sa6_embedscope(&dst6, 0))
1080 return (EINVAL); /* XXX: should be impossible */
1081 }
1082 /*
1083 * The destination address can be specified only for a p2p or a
1084 * loopback interface. If specified, the corresponding prefix length
1085 * must be 128.
1086 */
1087 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1088 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1089 /* XXX: noisy message */
1090 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1091 "be specified for a p2p or a loopback IF only\n"));
1092 return (EINVAL);
1093 }
1094 if (plen != 128) {
1095 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1096 "be 128 when dstaddr is specified\n"));
1097 return (EINVAL);
1098 }
1099 }
1100 /* lifetime consistency check */
1101 lt = &ifra->ifra_lifetime;
1102 if (lt->ia6t_pltime > lt->ia6t_vltime)
1103 return (EINVAL);
1104 if (lt->ia6t_vltime == 0) {
1105 /*
1106 * the following log might be noisy, but this is a typical
1107 * configuration mistake or a tool's bug.
1108 */
1109 nd6log((LOG_INFO,
1110 "in6_update_ifa: valid lifetime is 0 for %s\n",
1111 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1112
1113 if (ia == NULL)
1114 return (0); /* there's nothing to do */
1115 }
1116
1117 /*
1118 * If this is a new address, allocate a new ifaddr and link it
1119 * into chains.
1120 */
1121 if (ia == NULL) {
1122 hostIsNew = 1;
1123 /*
1124 * When in6_update_ifa() is called in a process of a received
1125 * RA, it is called under an interrupt context. So, we should
1126 * call malloc with M_NOWAIT.
1127 */
1128 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1129 M_NOWAIT);
1130 if (ia == NULL)
1131 return (ENOBUFS);
1132 bzero((caddr_t)ia, sizeof(*ia));
1133 ifa_init(&ia->ia_ifa);
1134 LIST_INIT(&ia->ia6_memberships);
1135 /* Initialize the address and masks, and put time stamp */
1136 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1137 ia->ia_addr.sin6_family = AF_INET6;
1138 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1139 ia->ia6_createtime = time_uptime;
1140 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1141 /*
1142 * XXX: some functions expect that ifa_dstaddr is not
1143 * NULL for p2p interfaces.
1144 */
1145 ia->ia_ifa.ifa_dstaddr =
1146 (struct sockaddr *)&ia->ia_dstaddr;
1147 } else {
1148 ia->ia_ifa.ifa_dstaddr = NULL;
1149 }
1150 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1151 ia->ia_ifp = ifp;
1152 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1153 IF_ADDR_WLOCK(ifp);
1154 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1155 IF_ADDR_WUNLOCK(ifp);
1156
1157 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1158 IN6_IFADDR_WLOCK();
1159 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1160 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr),
1161 ia, ia6_hash);
1162 IN6_IFADDR_WUNLOCK();
1163 }
1164
1165 /* update timestamp */
1166 ia->ia6_updatetime = time_uptime;
1167
1168 /* set prefix mask */
1169 if (ifra->ifra_prefixmask.sin6_len) {
1170 /*
1171 * We prohibit changing the prefix length of an existing
1172 * address, because
1173 * + such an operation should be rare in IPv6, and
1174 * + the operation would confuse prefix management.
1175 */
1176 if (ia->ia_prefixmask.sin6_len &&
1177 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1178 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1179 " existing (%s) address should not be changed\n",
1180 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1181 error = EINVAL;
1182 goto unlink;
1183 }
1184 ia->ia_prefixmask = ifra->ifra_prefixmask;
1185 ia->ia_prefixmask.sin6_family = AF_INET6;
1186 }
1187
1188 /*
1189 * If a new destination address is specified, scrub the old one and
1190 * install the new destination. Note that the interface must be
1191 * p2p or loopback (see the check above.)
1192 */
1193 if (dst6.sin6_family == AF_INET6 &&
1194 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1195 int e;
1196
1197 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1198 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1199 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1200 "a route to the old destination: %s\n",
1201 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1202 /* proceed anyway... */
1203 } else
1204 ia->ia_flags &= ~IFA_ROUTE;
1205 ia->ia_dstaddr = dst6;
1206 }
1207
1208 /*
1209 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1210 * to see if the address is deprecated or invalidated, but initialize
1211 * these members for applications.
1212 */
1213 ia->ia6_lifetime = ifra->ifra_lifetime;
1214 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1215 ia->ia6_lifetime.ia6t_expire =
1216 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1217 } else
1218 ia->ia6_lifetime.ia6t_expire = 0;
1219 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1220 ia->ia6_lifetime.ia6t_preferred =
1221 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1222 } else
1223 ia->ia6_lifetime.ia6t_preferred = 0;
1224
1225 /* reset the interface and routing table appropriately. */
1226 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1227 goto unlink;
1228
1229 /*
1230 * configure address flags.
1231 */
1232 ia->ia6_flags = ifra->ifra_flags;
1233 /*
1234 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1235 * userland, make it deprecated.
1236 */
1237 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1238 ia->ia6_lifetime.ia6t_pltime = 0;
1239 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1240 }
1241 /*
1242 * Make the address tentative before joining multicast addresses,
1243 * so that corresponding MLD responses would not have a tentative
1244 * source address.
1245 */
1246 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1247
1248 /*
1249 * DAD should be performed for an new address or addresses on
1250 * an interface with ND6_IFF_IFDISABLED.
1251 */
1252 if (in6if_do_dad(ifp) &&
1253 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1254 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1255
1256 /*
1257 * We are done if we have simply modified an existing address.
1258 */
1259 if (!hostIsNew)
1260 return (error);
1261
1262 /*
1263 * Beyond this point, we should call in6_purgeaddr upon an error,
1264 * not just go to unlink.
1265 */
1266
1267 /* Join necessary multicast groups. */
1268 in6m_sol = NULL;
1269 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1270 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1271 if (error)
1272 goto cleanup;
1273 }
1274
1275 /* Perform DAD, if the address is TENTATIVE. */
1276 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1277 int mindelay, maxdelay;
1278
1279 delay = 0;
1280 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1281 /*
1282 * We need to impose a delay before sending an NS
1283 * for DAD. Check if we also needed a delay for the
1284 * corresponding MLD message. If we did, the delay
1285 * should be larger than the MLD delay (this could be
1286 * relaxed a bit, but this simple logic is at least
1287 * safe).
1288 * XXX: Break data hiding guidelines and look at
1289 * state for the solicited multicast group.
1290 */
1291 mindelay = 0;
1292 if (in6m_sol != NULL &&
1293 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1294 mindelay = in6m_sol->in6m_timer;
1295 }
1296 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1297 if (maxdelay - mindelay == 0)
1298 delay = 0;
1299 else {
1300 delay =
1301 (arc4random() % (maxdelay - mindelay)) +
1302 mindelay;
1303 }
1304 }
1305 nd6_dad_start((struct ifaddr *)ia, delay);
1306 }
1307
1308 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1309 ifa_free(&ia->ia_ifa);
1310 return (error);
1311
1312 unlink:
1313 /*
1314 * XXX: if a change of an existing address failed, keep the entry
1315 * anyway.
1316 */
1317 if (hostIsNew) {
1318 in6_unlink_ifa(ia, ifp);
1319 ifa_free(&ia->ia_ifa);
1320 }
1321 return (error);
1322
1323 cleanup:
1324 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1325 ifa_free(&ia->ia_ifa);
1326 in6_purgeaddr(&ia->ia_ifa);
1327 return error;
1328 }
1329
1330 /*
1331 * Leave multicast groups. Factored out from in6_purgeaddr().
1332 * This entire work should only be done once, for the default FIB.
1333 */
1334 static int
in6_purgeaddr_mc(struct ifnet * ifp,struct in6_ifaddr * ia,struct ifaddr * ifa0)1335 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1336 {
1337 struct sockaddr_in6 mltaddr, mltmask;
1338 struct in6_multi_mship *imm;
1339 struct rtentry *rt;
1340 struct sockaddr_in6 sin6;
1341 int error;
1342
1343 /*
1344 * Leave from multicast groups we have joined for the interface.
1345 */
1346 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1347 LIST_REMOVE(imm, i6mm_chain);
1348 in6_leavegroup(imm);
1349 }
1350
1351 /*
1352 * Remove the link-local all-nodes address.
1353 */
1354 bzero(&mltmask, sizeof(mltmask));
1355 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1356 mltmask.sin6_family = AF_INET6;
1357 mltmask.sin6_addr = in6mask32;
1358
1359 bzero(&mltaddr, sizeof(mltaddr));
1360 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1361 mltaddr.sin6_family = AF_INET6;
1362 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1363
1364 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1365 return (error);
1366
1367 /*
1368 * As for the mltaddr above, proactively prepare the sin6 to avoid
1369 * rtentry un- and re-locking.
1370 */
1371 if (ifa0 != NULL) {
1372 bzero(&sin6, sizeof(sin6));
1373 sin6.sin6_len = sizeof(sin6);
1374 sin6.sin6_family = AF_INET6;
1375 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1376 sizeof(sin6.sin6_addr));
1377 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1378 if (error != 0)
1379 return (error);
1380 }
1381
1382 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1383 if (rt != NULL && rt->rt_gateway != NULL &&
1384 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1385 &ia->ia_addr.sin6_addr,
1386 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1387 /*
1388 * If no more IPv6 address exists on this interface then
1389 * remove the multicast address route.
1390 */
1391 if (ifa0 == NULL) {
1392 memcpy(&mltaddr.sin6_addr,
1393 &satosin6(rt_key(rt))->sin6_addr,
1394 sizeof(mltaddr.sin6_addr));
1395 RTFREE_LOCKED(rt);
1396 error = in6_rtrequest(RTM_DELETE,
1397 (struct sockaddr *)&mltaddr,
1398 (struct sockaddr *)&ia->ia_addr,
1399 (struct sockaddr *)&mltmask, RTF_UP,
1400 (struct rtentry **)0, RT_DEFAULT_FIB);
1401 if (error)
1402 log(LOG_INFO, "%s: link-local all-nodes "
1403 "multicast address deletion error\n",
1404 __func__);
1405 } else {
1406 /*
1407 * Replace the gateway of the route.
1408 */
1409 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1410 RTFREE_LOCKED(rt);
1411 }
1412 } else {
1413 if (rt != NULL)
1414 RTFREE_LOCKED(rt);
1415 }
1416
1417 /*
1418 * Remove the node-local all-nodes address.
1419 */
1420 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1421 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1422 return (error);
1423
1424 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1425 if (rt != NULL && rt->rt_gateway != NULL &&
1426 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1427 &ia->ia_addr.sin6_addr,
1428 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1429 /*
1430 * If no more IPv6 address exists on this interface then
1431 * remove the multicast address route.
1432 */
1433 if (ifa0 == NULL) {
1434 memcpy(&mltaddr.sin6_addr,
1435 &satosin6(rt_key(rt))->sin6_addr,
1436 sizeof(mltaddr.sin6_addr));
1437
1438 RTFREE_LOCKED(rt);
1439 error = in6_rtrequest(RTM_DELETE,
1440 (struct sockaddr *)&mltaddr,
1441 (struct sockaddr *)&ia->ia_addr,
1442 (struct sockaddr *)&mltmask, RTF_UP,
1443 (struct rtentry **)0, RT_DEFAULT_FIB);
1444 if (error)
1445 log(LOG_INFO, "%s: node-local all-nodes"
1446 "multicast address deletion error\n",
1447 __func__);
1448 } else {
1449 /*
1450 * Replace the gateway of the route.
1451 */
1452 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1453 RTFREE_LOCKED(rt);
1454 }
1455 } else {
1456 if (rt != NULL)
1457 RTFREE_LOCKED(rt);
1458 }
1459
1460 return (0);
1461 }
1462
1463 void
in6_purgeaddr(struct ifaddr * ifa)1464 in6_purgeaddr(struct ifaddr *ifa)
1465 {
1466 struct ifnet *ifp = ifa->ifa_ifp;
1467 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1468 int plen, error;
1469 struct ifaddr *ifa0;
1470
1471 if (ifa->ifa_carp)
1472 (*carp_detach_p)(ifa);
1473
1474 /*
1475 * find another IPv6 address as the gateway for the
1476 * link-local and node-local all-nodes multicast
1477 * address routes
1478 */
1479 IF_ADDR_RLOCK(ifp);
1480 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1481 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1482 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1483 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1484 continue;
1485 else
1486 break;
1487 }
1488 if (ifa0 != NULL)
1489 ifa_ref(ifa0);
1490 IF_ADDR_RUNLOCK(ifp);
1491
1492 /*
1493 * Remove the loopback route to the interface address.
1494 * The check for the current setting of "nd6_useloopback"
1495 * is not needed.
1496 */
1497 if (ia->ia_flags & IFA_RTSELF) {
1498 error = ifa_del_loopback_route((struct ifaddr *)ia,
1499 (struct sockaddr *)&ia->ia_addr);
1500 if (error == 0)
1501 ia->ia_flags &= ~IFA_RTSELF;
1502 }
1503
1504 /* stop DAD processing */
1505 nd6_dad_stop(ifa);
1506
1507 /* Remove local address entry from lltable. */
1508 in6_ifremloop(ifa);
1509
1510 /* Leave multicast groups. */
1511 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1512
1513 if (ifa0 != NULL)
1514 ifa_free(ifa0);
1515
1516 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1517 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1518 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1519 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1520 if (error != 0)
1521 log(LOG_INFO, "%s: err=%d, destination address delete "
1522 "failed\n", __func__, error);
1523 ia->ia_flags &= ~IFA_ROUTE;
1524 }
1525
1526 in6_unlink_ifa(ia, ifp);
1527 }
1528
1529 static void
in6_unlink_ifa(struct in6_ifaddr * ia,struct ifnet * ifp)1530 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1531 {
1532 char ip6buf[INET6_ADDRSTRLEN];
1533
1534 IF_ADDR_WLOCK(ifp);
1535 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1536 IF_ADDR_WUNLOCK(ifp);
1537 ifa_free(&ia->ia_ifa); /* if_addrhead */
1538
1539 /*
1540 * Defer the release of what might be the last reference to the
1541 * in6_ifaddr so that it can't be freed before the remainder of the
1542 * cleanup.
1543 */
1544 IN6_IFADDR_WLOCK();
1545 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1546 LIST_REMOVE(ia, ia6_hash);
1547 IN6_IFADDR_WUNLOCK();
1548
1549 /*
1550 * Release the reference to the base prefix. There should be a
1551 * positive reference.
1552 */
1553 if (ia->ia6_ndpr == NULL) {
1554 nd6log((LOG_NOTICE,
1555 "in6_unlink_ifa: autoconf'ed address "
1556 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1557 } else {
1558 ia->ia6_ndpr->ndpr_refcnt--;
1559 ia->ia6_ndpr = NULL;
1560 }
1561
1562 /*
1563 * Also, if the address being removed is autoconf'ed, call
1564 * pfxlist_onlink_check() since the release might affect the status of
1565 * other (detached) addresses.
1566 */
1567 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1568 pfxlist_onlink_check();
1569 }
1570 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1571 }
1572
1573 void
in6_purgeif(struct ifnet * ifp)1574 in6_purgeif(struct ifnet *ifp)
1575 {
1576 struct ifaddr *ifa, *nifa;
1577
1578 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1579 if (ifa->ifa_addr->sa_family != AF_INET6)
1580 continue;
1581 in6_purgeaddr(ifa);
1582 }
1583
1584 in6_ifdetach(ifp);
1585 }
1586
1587 /*
1588 * SIOC[GAD]LIFADDR.
1589 * SIOCGLIFADDR: get first address. (?)
1590 * SIOCGLIFADDR with IFLR_PREFIX:
1591 * get first address that matches the specified prefix.
1592 * SIOCALIFADDR: add the specified address.
1593 * SIOCALIFADDR with IFLR_PREFIX:
1594 * add the specified prefix, filling hostid part from
1595 * the first link-local address. prefixlen must be <= 64.
1596 * SIOCDLIFADDR: delete the specified address.
1597 * SIOCDLIFADDR with IFLR_PREFIX:
1598 * delete the first address that matches the specified prefix.
1599 * return values:
1600 * EINVAL on invalid parameters
1601 * EADDRNOTAVAIL on prefix match failed/specified address not found
1602 * other values may be returned from in6_ioctl()
1603 *
1604 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1605 * this is to accomodate address naming scheme other than RFC2374,
1606 * in the future.
1607 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1608 * address encoding scheme. (see figure on page 8)
1609 * Notifies other subsystems about address change/arrival:
1610 * 1) Notifies device handler on the first IPv6 address assignment
1611 * 2) Handle routing table changes for P2P links and route
1612 * 3) Handle routing table changes for address host route
1613 */
1614 static int
in6_lifaddr_ioctl(struct socket * so,u_long cmd,caddr_t data,struct ifnet * ifp,struct thread * td)1615 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1616 struct ifnet *ifp, struct thread *td)
1617 {
1618 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1619 struct ifaddr *ifa;
1620 struct sockaddr *sa;
1621
1622 /* sanity checks */
1623 if (!data || !ifp) {
1624 panic("invalid argument to in6_lifaddr_ioctl");
1625 /* NOTREACHED */
1626 }
1627
1628 switch (cmd) {
1629 case SIOCGLIFADDR:
1630 /* address must be specified on GET with IFLR_PREFIX */
1631 if ((iflr->flags & IFLR_PREFIX) == 0)
1632 break;
1633 /* FALLTHROUGH */
1634 case SIOCALIFADDR:
1635 case SIOCDLIFADDR:
1636 /* address must be specified on ADD and DELETE */
1637 sa = (struct sockaddr *)&iflr->addr;
1638 if (sa->sa_family != AF_INET6)
1639 return EINVAL;
1640 if (sa->sa_len != sizeof(struct sockaddr_in6))
1641 return EINVAL;
1642 /* XXX need improvement */
1643 sa = (struct sockaddr *)&iflr->dstaddr;
1644 if (sa->sa_family && sa->sa_family != AF_INET6)
1645 return EINVAL;
1646 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1647 return EINVAL;
1648 break;
1649 default: /* shouldn't happen */
1650 #if 0
1651 panic("invalid cmd to in6_lifaddr_ioctl");
1652 /* NOTREACHED */
1653 #else
1654 return EOPNOTSUPP;
1655 #endif
1656 }
1657 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1658 return EINVAL;
1659
1660 switch (cmd) {
1661 case SIOCALIFADDR:
1662 {
1663 struct in6_aliasreq ifra;
1664 struct in6_addr *hostid = NULL;
1665 int prefixlen;
1666
1667 ifa = NULL;
1668 if ((iflr->flags & IFLR_PREFIX) != 0) {
1669 struct sockaddr_in6 *sin6;
1670
1671 /*
1672 * hostid is to fill in the hostid part of the
1673 * address. hostid points to the first link-local
1674 * address attached to the interface.
1675 */
1676 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1677 if (!ifa)
1678 return EADDRNOTAVAIL;
1679 hostid = IFA_IN6(ifa);
1680
1681 /* prefixlen must be <= 64. */
1682 if (64 < iflr->prefixlen) {
1683 if (ifa != NULL)
1684 ifa_free(ifa);
1685 return EINVAL;
1686 }
1687 prefixlen = iflr->prefixlen;
1688
1689 /* hostid part must be zero. */
1690 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1691 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1692 sin6->sin6_addr.s6_addr32[3] != 0) {
1693 if (ifa != NULL)
1694 ifa_free(ifa);
1695 return EINVAL;
1696 }
1697 } else
1698 prefixlen = iflr->prefixlen;
1699
1700 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1701 bzero(&ifra, sizeof(ifra));
1702 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1703
1704 bcopy(&iflr->addr, &ifra.ifra_addr,
1705 ((struct sockaddr *)&iflr->addr)->sa_len);
1706 if (hostid) {
1707 /* fill in hostid part */
1708 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1709 hostid->s6_addr32[2];
1710 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1711 hostid->s6_addr32[3];
1712 }
1713
1714 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1715 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1716 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1717 if (hostid) {
1718 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1719 hostid->s6_addr32[2];
1720 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1721 hostid->s6_addr32[3];
1722 }
1723 }
1724 if (ifa != NULL)
1725 ifa_free(ifa);
1726
1727 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1728 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1729
1730 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1731 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1732 }
1733 case SIOCGLIFADDR:
1734 case SIOCDLIFADDR:
1735 {
1736 struct in6_ifaddr *ia;
1737 struct in6_addr mask, candidate, match;
1738 struct sockaddr_in6 *sin6;
1739 int cmp;
1740
1741 bzero(&mask, sizeof(mask));
1742 if (iflr->flags & IFLR_PREFIX) {
1743 /* lookup a prefix rather than address. */
1744 in6_prefixlen2mask(&mask, iflr->prefixlen);
1745
1746 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1747 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1748 match.s6_addr32[0] &= mask.s6_addr32[0];
1749 match.s6_addr32[1] &= mask.s6_addr32[1];
1750 match.s6_addr32[2] &= mask.s6_addr32[2];
1751 match.s6_addr32[3] &= mask.s6_addr32[3];
1752
1753 /* if you set extra bits, that's wrong */
1754 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1755 return EINVAL;
1756
1757 cmp = 1;
1758 } else {
1759 if (cmd == SIOCGLIFADDR) {
1760 /* on getting an address, take the 1st match */
1761 cmp = 0; /* XXX */
1762 } else {
1763 /* on deleting an address, do exact match */
1764 in6_prefixlen2mask(&mask, 128);
1765 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1766 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1767
1768 cmp = 1;
1769 }
1770 }
1771
1772 IF_ADDR_RLOCK(ifp);
1773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1774 if (ifa->ifa_addr->sa_family != AF_INET6)
1775 continue;
1776 if (!cmp)
1777 break;
1778
1779 /*
1780 * XXX: this is adhoc, but is necessary to allow
1781 * a user to specify fe80::/64 (not /10) for a
1782 * link-local address.
1783 */
1784 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1785 in6_clearscope(&candidate);
1786 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1787 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1788 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1789 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1790 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1791 break;
1792 }
1793 if (ifa != NULL)
1794 ifa_ref(ifa);
1795 IF_ADDR_RUNLOCK(ifp);
1796 if (!ifa)
1797 return EADDRNOTAVAIL;
1798 ia = ifa2ia6(ifa);
1799
1800 if (cmd == SIOCGLIFADDR) {
1801 int error;
1802
1803 /* fill in the if_laddrreq structure */
1804 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1805 error = sa6_recoverscope(
1806 (struct sockaddr_in6 *)&iflr->addr);
1807 if (error != 0) {
1808 ifa_free(ifa);
1809 return (error);
1810 }
1811
1812 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1813 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1814 ia->ia_dstaddr.sin6_len);
1815 error = sa6_recoverscope(
1816 (struct sockaddr_in6 *)&iflr->dstaddr);
1817 if (error != 0) {
1818 ifa_free(ifa);
1819 return (error);
1820 }
1821 } else
1822 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1823
1824 iflr->prefixlen =
1825 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1826
1827 iflr->flags = ia->ia6_flags; /* XXX */
1828 ifa_free(ifa);
1829
1830 return 0;
1831 } else {
1832 struct in6_aliasreq ifra;
1833
1834 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1835 bzero(&ifra, sizeof(ifra));
1836 bcopy(iflr->iflr_name, ifra.ifra_name,
1837 sizeof(ifra.ifra_name));
1838
1839 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1840 ia->ia_addr.sin6_len);
1841 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1842 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1843 ia->ia_dstaddr.sin6_len);
1844 } else {
1845 bzero(&ifra.ifra_dstaddr,
1846 sizeof(ifra.ifra_dstaddr));
1847 }
1848 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1849 ia->ia_prefixmask.sin6_len);
1850
1851 ifra.ifra_flags = ia->ia6_flags;
1852 ifa_free(ifa);
1853 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1854 ifp, td);
1855 }
1856 }
1857 }
1858
1859 return EOPNOTSUPP; /* just for safety */
1860 }
1861
1862 /*
1863 * Initialize an interface's IPv6 address and routing table entry.
1864 */
1865 static int
in6_ifinit(struct ifnet * ifp,struct in6_ifaddr * ia,struct sockaddr_in6 * sin6,int newhost)1866 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1867 struct sockaddr_in6 *sin6, int newhost)
1868 {
1869 int error = 0, plen, ifacount = 0;
1870 struct ifaddr *ifa;
1871
1872 /*
1873 * Give the interface a chance to initialize
1874 * if this is its first address,
1875 * and to validate the address if necessary.
1876 */
1877 IF_ADDR_RLOCK(ifp);
1878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1879 if (ifa->ifa_addr->sa_family != AF_INET6)
1880 continue;
1881 ifacount++;
1882 }
1883 IF_ADDR_RUNLOCK(ifp);
1884
1885 ia->ia_addr = *sin6;
1886
1887 if (ifacount <= 1 && ifp->if_ioctl) {
1888 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1889 if (error)
1890 return (error);
1891 }
1892
1893 ia->ia_ifa.ifa_metric = ifp->if_metric;
1894
1895 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1896
1897 /*
1898 * Special case:
1899 * If a new destination address is specified for a point-to-point
1900 * interface, install a route to the destination as an interface
1901 * direct route.
1902 * XXX: the logic below rejects assigning multiple addresses on a p2p
1903 * interface that share the same destination.
1904 */
1905 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1906 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1907 ia->ia_dstaddr.sin6_family == AF_INET6) {
1908 int rtflags = RTF_UP | RTF_HOST;
1909 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1910 if (error)
1911 return (error);
1912 ia->ia_flags |= IFA_ROUTE;
1913 /*
1914 * Handle the case for ::1 .
1915 */
1916 if (ifp->if_flags & IFF_LOOPBACK)
1917 ia->ia_flags |= IFA_RTSELF;
1918 }
1919
1920 /*
1921 * add a loopback route to self
1922 */
1923 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1924 error = ifa_add_loopback_route((struct ifaddr *)ia,
1925 (struct sockaddr *)&ia->ia_addr);
1926 if (error == 0)
1927 ia->ia_flags |= IFA_RTSELF;
1928 }
1929
1930 /* Add local address to lltable, if necessary (ex. on p2p link). */
1931 if (newhost)
1932 in6_ifaddloop(&(ia->ia_ifa));
1933
1934 return (error);
1935 }
1936
1937 /*
1938 * Find an IPv6 interface link-local address specific to an interface.
1939 * ifaddr is returned referenced.
1940 */
1941 struct in6_ifaddr *
in6ifa_ifpforlinklocal(struct ifnet * ifp,int ignoreflags)1942 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1943 {
1944 struct ifaddr *ifa;
1945
1946 IF_ADDR_RLOCK(ifp);
1947 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1948 if (ifa->ifa_addr->sa_family != AF_INET6)
1949 continue;
1950 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1951 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1952 ignoreflags) != 0)
1953 continue;
1954 ifa_ref(ifa);
1955 break;
1956 }
1957 }
1958 IF_ADDR_RUNLOCK(ifp);
1959
1960 return ((struct in6_ifaddr *)ifa);
1961 }
1962
1963
1964 /*
1965 * find the internet address corresponding to a given interface and address.
1966 * ifaddr is returned referenced.
1967 */
1968 struct in6_ifaddr *
in6ifa_ifpwithaddr(struct ifnet * ifp,struct in6_addr * addr)1969 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1970 {
1971 struct ifaddr *ifa;
1972
1973 IF_ADDR_RLOCK(ifp);
1974 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1975 if (ifa->ifa_addr->sa_family != AF_INET6)
1976 continue;
1977 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1978 ifa_ref(ifa);
1979 break;
1980 }
1981 }
1982 IF_ADDR_RUNLOCK(ifp);
1983
1984 return ((struct in6_ifaddr *)ifa);
1985 }
1986
1987 /*
1988 * Find a link-local scoped address on ifp and return it if any.
1989 */
1990 struct in6_ifaddr *
in6ifa_llaonifp(struct ifnet * ifp)1991 in6ifa_llaonifp(struct ifnet *ifp)
1992 {
1993 struct sockaddr_in6 *sin6;
1994 struct ifaddr *ifa;
1995
1996 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1997 return (NULL);
1998 IF_ADDR_RLOCK(ifp);
1999 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2000 if (ifa->ifa_addr->sa_family != AF_INET6)
2001 continue;
2002 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
2003 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
2004 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
2005 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
2006 break;
2007 }
2008 IF_ADDR_RUNLOCK(ifp);
2009
2010 return ((struct in6_ifaddr *)ifa);
2011 }
2012
2013 /*
2014 * Convert IP6 address to printable (loggable) representation. Caller
2015 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
2016 */
2017 static char digits[] = "0123456789abcdef";
2018 char *
ip6_sprintf(char * ip6buf,const struct in6_addr * addr)2019 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
2020 {
2021 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
2022 char *cp;
2023 const u_int16_t *a = (const u_int16_t *)addr;
2024 const u_int8_t *d;
2025 int dcolon = 0, zero = 0;
2026
2027 cp = ip6buf;
2028
2029 for (i = 0; i < 8; i++) {
2030 if (*(a + i) == 0) {
2031 cnt++;
2032 if (cnt == 1)
2033 idx = i;
2034 }
2035 else if (maxcnt < cnt) {
2036 maxcnt = cnt;
2037 index = idx;
2038 cnt = 0;
2039 }
2040 }
2041 if (maxcnt < cnt) {
2042 maxcnt = cnt;
2043 index = idx;
2044 }
2045
2046 for (i = 0; i < 8; i++) {
2047 if (dcolon == 1) {
2048 if (*a == 0) {
2049 if (i == 7)
2050 *cp++ = ':';
2051 a++;
2052 continue;
2053 } else
2054 dcolon = 2;
2055 }
2056 if (*a == 0) {
2057 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2058 if (i == 0)
2059 *cp++ = ':';
2060 *cp++ = ':';
2061 dcolon = 1;
2062 } else {
2063 *cp++ = '0';
2064 *cp++ = ':';
2065 }
2066 a++;
2067 continue;
2068 }
2069 d = (const u_char *)a;
2070 /* Try to eliminate leading zeros in printout like in :0001. */
2071 zero = 1;
2072 *cp = digits[*d >> 4];
2073 if (*cp != '0') {
2074 zero = 0;
2075 cp++;
2076 }
2077 *cp = digits[*d++ & 0xf];
2078 if (zero == 0 || (*cp != '0')) {
2079 zero = 0;
2080 cp++;
2081 }
2082 *cp = digits[*d >> 4];
2083 if (zero == 0 || (*cp != '0')) {
2084 zero = 0;
2085 cp++;
2086 }
2087 *cp++ = digits[*d & 0xf];
2088 *cp++ = ':';
2089 a++;
2090 }
2091 *--cp = '\0';
2092 return (ip6buf);
2093 }
2094
2095 int
in6_localaddr(struct in6_addr * in6)2096 in6_localaddr(struct in6_addr *in6)
2097 {
2098 struct in6_ifaddr *ia;
2099
2100 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2101 return 1;
2102
2103 IN6_IFADDR_RLOCK();
2104 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2105 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2106 &ia->ia_prefixmask.sin6_addr)) {
2107 IN6_IFADDR_RUNLOCK();
2108 return 1;
2109 }
2110 }
2111 IN6_IFADDR_RUNLOCK();
2112
2113 return (0);
2114 }
2115
2116 /*
2117 * Return 1 if an internet address is for the local host and configured
2118 * on one of its interfaces.
2119 */
2120 int
in6_localip(struct in6_addr * in6)2121 in6_localip(struct in6_addr *in6)
2122 {
2123 struct in6_ifaddr *ia;
2124
2125 IN6_IFADDR_RLOCK();
2126 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
2127 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2128 IN6_IFADDR_RUNLOCK();
2129 return (1);
2130 }
2131 }
2132 IN6_IFADDR_RUNLOCK();
2133 return (0);
2134 }
2135
2136 int
in6_is_addr_deprecated(struct sockaddr_in6 * sa6)2137 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2138 {
2139 struct in6_ifaddr *ia;
2140
2141 IN6_IFADDR_RLOCK();
2142 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
2143 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
2144 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2145 IN6_IFADDR_RUNLOCK();
2146 return (1); /* true */
2147 }
2148 break;
2149 }
2150 }
2151 IN6_IFADDR_RUNLOCK();
2152
2153 return (0); /* false */
2154 }
2155
2156 /*
2157 * return length of part which dst and src are equal
2158 * hard coding...
2159 */
2160 int
in6_matchlen(struct in6_addr * src,struct in6_addr * dst)2161 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2162 {
2163 int match = 0;
2164 u_char *s = (u_char *)src, *d = (u_char *)dst;
2165 u_char *lim = s + 16, r;
2166
2167 while (s < lim)
2168 if ((r = (*d++ ^ *s++)) != 0) {
2169 while (r < 128) {
2170 match++;
2171 r <<= 1;
2172 }
2173 break;
2174 } else
2175 match += 8;
2176 return match;
2177 }
2178
2179 /* XXX: to be scope conscious */
2180 int
in6_are_prefix_equal(struct in6_addr * p1,struct in6_addr * p2,int len)2181 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2182 {
2183 int bytelen, bitlen;
2184
2185 /* sanity check */
2186 if (0 > len || len > 128) {
2187 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2188 len);
2189 return (0);
2190 }
2191
2192 bytelen = len / 8;
2193 bitlen = len % 8;
2194
2195 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2196 return (0);
2197 if (bitlen != 0 &&
2198 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2199 p2->s6_addr[bytelen] >> (8 - bitlen))
2200 return (0);
2201
2202 return (1);
2203 }
2204
2205 void
in6_prefixlen2mask(struct in6_addr * maskp,int len)2206 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2207 {
2208 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2209 int bytelen, bitlen, i;
2210
2211 /* sanity check */
2212 if (0 > len || len > 128) {
2213 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2214 len);
2215 return;
2216 }
2217
2218 bzero(maskp, sizeof(*maskp));
2219 bytelen = len / 8;
2220 bitlen = len % 8;
2221 for (i = 0; i < bytelen; i++)
2222 maskp->s6_addr[i] = 0xff;
2223 if (bitlen)
2224 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2225 }
2226
2227 /*
2228 * return the best address out of the same scope. if no address was
2229 * found, return the first valid address from designated IF.
2230 */
2231 struct in6_ifaddr *
in6_ifawithifp(struct ifnet * ifp,struct in6_addr * dst)2232 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2233 {
2234 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2235 struct ifaddr *ifa;
2236 struct in6_ifaddr *besta = 0;
2237 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2238
2239 dep[0] = dep[1] = NULL;
2240
2241 /*
2242 * We first look for addresses in the same scope.
2243 * If there is one, return it.
2244 * If two or more, return one which matches the dst longest.
2245 * If none, return one of global addresses assigned other ifs.
2246 */
2247 IF_ADDR_RLOCK(ifp);
2248 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2249 if (ifa->ifa_addr->sa_family != AF_INET6)
2250 continue;
2251 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2252 continue; /* XXX: is there any case to allow anycast? */
2253 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2254 continue; /* don't use this interface */
2255 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2256 continue;
2257 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2258 if (V_ip6_use_deprecated)
2259 dep[0] = (struct in6_ifaddr *)ifa;
2260 continue;
2261 }
2262
2263 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2264 /*
2265 * call in6_matchlen() as few as possible
2266 */
2267 if (besta) {
2268 if (blen == -1)
2269 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2270 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2271 if (tlen > blen) {
2272 blen = tlen;
2273 besta = (struct in6_ifaddr *)ifa;
2274 }
2275 } else
2276 besta = (struct in6_ifaddr *)ifa;
2277 }
2278 }
2279 if (besta) {
2280 ifa_ref(&besta->ia_ifa);
2281 IF_ADDR_RUNLOCK(ifp);
2282 return (besta);
2283 }
2284
2285 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2286 if (ifa->ifa_addr->sa_family != AF_INET6)
2287 continue;
2288 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2289 continue; /* XXX: is there any case to allow anycast? */
2290 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2291 continue; /* don't use this interface */
2292 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2293 continue;
2294 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2295 if (V_ip6_use_deprecated)
2296 dep[1] = (struct in6_ifaddr *)ifa;
2297 continue;
2298 }
2299
2300 if (ifa != NULL)
2301 ifa_ref(ifa);
2302 IF_ADDR_RUNLOCK(ifp);
2303 return (struct in6_ifaddr *)ifa;
2304 }
2305
2306 /* use the last-resort values, that are, deprecated addresses */
2307 if (dep[0]) {
2308 ifa_ref((struct ifaddr *)dep[0]);
2309 IF_ADDR_RUNLOCK(ifp);
2310 return dep[0];
2311 }
2312 if (dep[1]) {
2313 ifa_ref((struct ifaddr *)dep[1]);
2314 IF_ADDR_RUNLOCK(ifp);
2315 return dep[1];
2316 }
2317
2318 IF_ADDR_RUNLOCK(ifp);
2319 return NULL;
2320 }
2321
2322 /*
2323 * perform DAD when interface becomes IFF_UP.
2324 */
2325 void
in6_if_up(struct ifnet * ifp)2326 in6_if_up(struct ifnet *ifp)
2327 {
2328 struct ifaddr *ifa;
2329 struct in6_ifaddr *ia;
2330
2331 IF_ADDR_RLOCK(ifp);
2332 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2333 if (ifa->ifa_addr->sa_family != AF_INET6)
2334 continue;
2335 ia = (struct in6_ifaddr *)ifa;
2336 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2337 /*
2338 * The TENTATIVE flag was likely set by hand
2339 * beforehand, implicitly indicating the need for DAD.
2340 * We may be able to skip the random delay in this
2341 * case, but we impose delays just in case.
2342 */
2343 nd6_dad_start(ifa,
2344 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2345 }
2346 }
2347 IF_ADDR_RUNLOCK(ifp);
2348
2349 /*
2350 * special cases, like 6to4, are handled in in6_ifattach
2351 */
2352 in6_ifattach(ifp, NULL);
2353 }
2354
2355 int
in6if_do_dad(struct ifnet * ifp)2356 in6if_do_dad(struct ifnet *ifp)
2357 {
2358 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2359 return (0);
2360
2361 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
2362 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
2363 return (0);
2364
2365 switch (ifp->if_type) {
2366 #ifdef IFT_DUMMY
2367 case IFT_DUMMY:
2368 #endif
2369 case IFT_FAITH:
2370 /*
2371 * These interfaces do not have the IFF_LOOPBACK flag,
2372 * but loop packets back. We do not have to do DAD on such
2373 * interfaces. We should even omit it, because loop-backed
2374 * NS would confuse the DAD procedure.
2375 */
2376 return (0);
2377 default:
2378 /*
2379 * Our DAD routine requires the interface up and running.
2380 * However, some interfaces can be up before the RUNNING
2381 * status. Additionaly, users may try to assign addresses
2382 * before the interface becomes up (or running).
2383 * This function returns EAGAIN in that case.
2384 * The caller should mark "tentative" on the address instead of
2385 * performing DAD immediately.
2386 */
2387 if (!((ifp->if_flags & IFF_UP) &&
2388 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2389 return (EAGAIN);
2390
2391 return (1);
2392 }
2393 }
2394
2395 /*
2396 * Calculate max IPv6 MTU through all the interfaces and store it
2397 * to in6_maxmtu.
2398 */
2399 void
in6_setmaxmtu(void)2400 in6_setmaxmtu(void)
2401 {
2402 unsigned long maxmtu = 0;
2403 struct ifnet *ifp;
2404
2405 IFNET_RLOCK_NOSLEEP();
2406 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2407 /* this function can be called during ifnet initialization */
2408 if (!ifp->if_afdata[AF_INET6])
2409 continue;
2410 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2411 IN6_LINKMTU(ifp) > maxmtu)
2412 maxmtu = IN6_LINKMTU(ifp);
2413 }
2414 IFNET_RUNLOCK_NOSLEEP();
2415 if (maxmtu) /* update only when maxmtu is positive */
2416 V_in6_maxmtu = maxmtu;
2417 }
2418
2419 /*
2420 * Provide the length of interface identifiers to be used for the link attached
2421 * to the given interface. The length should be defined in "IPv6 over
2422 * xxx-link" document. Note that address architecture might also define
2423 * the length for a particular set of address prefixes, regardless of the
2424 * link type. As clarified in rfc2462bis, those two definitions should be
2425 * consistent, and those really are as of August 2004.
2426 */
2427 int
in6_if2idlen(struct ifnet * ifp)2428 in6_if2idlen(struct ifnet *ifp)
2429 {
2430 switch (ifp->if_type) {
2431 case IFT_ETHER: /* RFC2464 */
2432 #ifdef IFT_PROPVIRTUAL
2433 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2434 #endif
2435 #ifdef IFT_L2VLAN
2436 case IFT_L2VLAN: /* ditto */
2437 #endif
2438 #ifdef IFT_IEEE80211
2439 case IFT_IEEE80211: /* ditto */
2440 #endif
2441 #ifdef IFT_MIP
2442 case IFT_MIP: /* ditto */
2443 #endif
2444 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */
2445 case IFT_INFINIBAND:
2446 return (64);
2447 case IFT_FDDI: /* RFC2467 */
2448 return (64);
2449 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2450 return (64);
2451 case IFT_PPP: /* RFC2472 */
2452 return (64);
2453 case IFT_ARCNET: /* RFC2497 */
2454 return (64);
2455 case IFT_FRELAY: /* RFC2590 */
2456 return (64);
2457 case IFT_IEEE1394: /* RFC3146 */
2458 return (64);
2459 case IFT_GIF:
2460 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2461 case IFT_LOOP:
2462 return (64); /* XXX: is this really correct? */
2463 default:
2464 /*
2465 * Unknown link type:
2466 * It might be controversial to use the today's common constant
2467 * of 64 for these cases unconditionally. For full compliance,
2468 * we should return an error in this case. On the other hand,
2469 * if we simply miss the standard for the link type or a new
2470 * standard is defined for a new link type, the IFID length
2471 * is very likely to be the common constant. As a compromise,
2472 * we always use the constant, but make an explicit notice
2473 * indicating the "unknown" case.
2474 */
2475 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2476 return (64);
2477 }
2478 }
2479
2480 #include <sys/sysctl.h>
2481
2482 struct in6_llentry {
2483 struct llentry base;
2484 struct sockaddr_in6 l3_addr6;
2485 };
2486
2487 /*
2488 * Deletes an address from the address table.
2489 * This function is called by the timer functions
2490 * such as arptimer() and nd6_llinfo_timer(), and
2491 * the caller does the locking.
2492 */
2493 static void
in6_lltable_free(struct lltable * llt,struct llentry * lle)2494 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2495 {
2496 LLE_WUNLOCK(lle);
2497 LLE_LOCK_DESTROY(lle);
2498 free(lle, M_LLTABLE);
2499 }
2500
2501 static struct llentry *
in6_lltable_new(const struct sockaddr * l3addr,u_int flags)2502 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2503 {
2504 struct in6_llentry *lle;
2505
2506 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2507 if (lle == NULL) /* NB: caller generates msg */
2508 return NULL;
2509
2510 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2511 lle->base.lle_refcnt = 1;
2512 lle->base.lle_free = in6_lltable_free;
2513 LLE_LOCK_INIT(&lle->base);
2514 callout_init(&lle->base.ln_timer_ch, 1);
2515
2516 return (&lle->base);
2517 }
2518
2519 static void
in6_lltable_prefix_free(struct lltable * llt,const struct sockaddr * prefix,const struct sockaddr * mask,u_int flags)2520 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2521 const struct sockaddr *mask, u_int flags)
2522 {
2523 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2524 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2525 struct llentry *lle, *next;
2526 int i;
2527
2528 /*
2529 * (flags & LLE_STATIC) means deleting all entries
2530 * including static ND6 entries.
2531 */
2532 IF_AFDATA_WLOCK(llt->llt_ifp);
2533 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2534 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2535 if (IN6_ARE_MASKED_ADDR_EQUAL(
2536 &satosin6(L3_ADDR(lle))->sin6_addr,
2537 &pfx->sin6_addr, &msk->sin6_addr) &&
2538 ((flags & LLE_STATIC) ||
2539 !(lle->la_flags & LLE_STATIC))) {
2540 LLE_WLOCK(lle);
2541 if (callout_stop(&lle->la_timer))
2542 LLE_REMREF(lle);
2543 llentry_free(lle);
2544 }
2545 }
2546 }
2547 IF_AFDATA_WUNLOCK(llt->llt_ifp);
2548 }
2549
2550 static int
in6_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)2551 in6_lltable_rtcheck(struct ifnet *ifp,
2552 u_int flags,
2553 const struct sockaddr *l3addr)
2554 {
2555 struct rtentry *rt;
2556 char ip6buf[INET6_ADDRSTRLEN];
2557
2558 KASSERT(l3addr->sa_family == AF_INET6,
2559 ("sin_family %d", l3addr->sa_family));
2560
2561 /* Our local addresses are always only installed on the default FIB. */
2562 /* XXX rtalloc1 should take a const param */
2563 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2564 RT_DEFAULT_FIB);
2565 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2566 struct ifaddr *ifa;
2567 /*
2568 * Create an ND6 cache for an IPv6 neighbor
2569 * that is not covered by our own prefix.
2570 */
2571 /* XXX ifaof_ifpforaddr should take a const param */
2572 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2573 if (ifa != NULL) {
2574 ifa_free(ifa);
2575 if (rt != NULL)
2576 RTFREE_LOCKED(rt);
2577 return 0;
2578 }
2579 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2580 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2581 if (rt != NULL)
2582 RTFREE_LOCKED(rt);
2583 return EINVAL;
2584 }
2585 RTFREE_LOCKED(rt);
2586 return 0;
2587 }
2588
2589 static struct llentry *
in6_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2590 in6_lltable_lookup(struct lltable *llt, u_int flags,
2591 const struct sockaddr *l3addr)
2592 {
2593 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2594 struct ifnet *ifp = llt->llt_ifp;
2595 struct llentry *lle;
2596 struct llentries *lleh;
2597 u_int hashkey;
2598
2599 IF_AFDATA_LOCK_ASSERT(ifp);
2600 KASSERT(l3addr->sa_family == AF_INET6,
2601 ("sin_family %d", l3addr->sa_family));
2602
2603 hashkey = sin6->sin6_addr.s6_addr32[3];
2604 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2605 LIST_FOREACH(lle, lleh, lle_next) {
2606 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2607 if (lle->la_flags & LLE_DELETED)
2608 continue;
2609 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2610 sizeof(struct in6_addr)) == 0)
2611 break;
2612 }
2613
2614 if (lle == NULL) {
2615 if (!(flags & LLE_CREATE))
2616 return (NULL);
2617 IF_AFDATA_WLOCK_ASSERT(ifp);
2618 /*
2619 * A route that covers the given address must have
2620 * been installed 1st because we are doing a resolution,
2621 * verify this.
2622 */
2623 if (!(flags & LLE_IFADDR) &&
2624 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2625 return NULL;
2626
2627 lle = in6_lltable_new(l3addr, flags);
2628 if (lle == NULL) {
2629 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2630 return NULL;
2631 }
2632 lle->la_flags = flags & ~LLE_CREATE;
2633 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2634 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2635 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2636 }
2637
2638 lle->lle_tbl = llt;
2639 lle->lle_head = lleh;
2640 lle->la_flags |= LLE_LINKED;
2641 LIST_INSERT_HEAD(lleh, lle, lle_next);
2642 } else if (flags & LLE_DELETE) {
2643 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2644 LLE_WLOCK(lle);
2645 lle->la_flags |= LLE_DELETED;
2646 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2647 #ifdef DIAGNOSTIC
2648 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2649 #endif
2650 if ((lle->la_flags &
2651 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2652 llentry_free(lle);
2653 else
2654 LLE_WUNLOCK(lle);
2655 }
2656 lle = (void *)-1;
2657 }
2658 if (LLE_IS_VALID(lle)) {
2659 if (flags & LLE_EXCLUSIVE)
2660 LLE_WLOCK(lle);
2661 else
2662 LLE_RLOCK(lle);
2663 }
2664 return (lle);
2665 }
2666
2667 static int
in6_lltable_dump(struct lltable * llt,struct sysctl_req * wr)2668 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2669 {
2670 struct ifnet *ifp = llt->llt_ifp;
2671 struct llentry *lle;
2672 /* XXX stack use */
2673 struct {
2674 struct rt_msghdr rtm;
2675 struct sockaddr_in6 sin6;
2676 /*
2677 * ndp.c assumes that sdl is word aligned
2678 */
2679 #ifdef __LP64__
2680 uint32_t pad;
2681 #endif
2682 struct sockaddr_dl sdl;
2683 } ndpc;
2684 int i, error;
2685
2686 if (ifp->if_flags & IFF_LOOPBACK)
2687 return 0;
2688
2689 LLTABLE_LOCK_ASSERT();
2690
2691 error = 0;
2692 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2693 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2694 struct sockaddr_dl *sdl;
2695
2696 /* skip deleted or invalid entries */
2697 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2698 continue;
2699 /* Skip if jailed and not a valid IP of the prison. */
2700 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2701 continue;
2702 /*
2703 * produce a msg made of:
2704 * struct rt_msghdr;
2705 * struct sockaddr_in6 (IPv6)
2706 * struct sockaddr_dl;
2707 */
2708 bzero(&ndpc, sizeof(ndpc));
2709 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2710 ndpc.rtm.rtm_version = RTM_VERSION;
2711 ndpc.rtm.rtm_type = RTM_GET;
2712 ndpc.rtm.rtm_flags = RTF_UP;
2713 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2714 ndpc.sin6.sin6_family = AF_INET6;
2715 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2716 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2717 if (V_deembed_scopeid)
2718 sa6_recoverscope(&ndpc.sin6);
2719
2720 /* publish */
2721 if (lle->la_flags & LLE_PUB)
2722 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2723
2724 sdl = &ndpc.sdl;
2725 sdl->sdl_family = AF_LINK;
2726 sdl->sdl_len = sizeof(*sdl);
2727 sdl->sdl_alen = ifp->if_addrlen;
2728 sdl->sdl_index = ifp->if_index;
2729 sdl->sdl_type = ifp->if_type;
2730 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2731 ndpc.rtm.rtm_rmx.rmx_expire =
2732 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2733 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2734 if (lle->la_flags & LLE_STATIC)
2735 ndpc.rtm.rtm_flags |= RTF_STATIC;
2736 ndpc.rtm.rtm_index = ifp->if_index;
2737 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2738 if (error)
2739 break;
2740 }
2741 }
2742 return error;
2743 }
2744
2745 void *
in6_domifattach(struct ifnet * ifp)2746 in6_domifattach(struct ifnet *ifp)
2747 {
2748 struct in6_ifextra *ext;
2749
2750 /* There are not IPv6-capable interfaces. */
2751 switch (ifp->if_type) {
2752 case IFT_PFLOG:
2753 case IFT_PFSYNC:
2754 case IFT_USB:
2755 return (NULL);
2756 }
2757 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2758 bzero(ext, sizeof(*ext));
2759
2760 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2761 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2762 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2763 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2764
2765 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2766 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2767 M_WAITOK);
2768 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2769 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2770
2771 ext->nd_ifinfo = nd6_ifattach(ifp);
2772 ext->scope6_id = scope6_ifattach(ifp);
2773 ext->lltable = lltable_init(ifp, AF_INET6);
2774 if (ext->lltable != NULL) {
2775 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2776 ext->lltable->llt_lookup = in6_lltable_lookup;
2777 ext->lltable->llt_dump = in6_lltable_dump;
2778 }
2779
2780 ext->mld_ifinfo = mld_domifattach(ifp);
2781
2782 return ext;
2783 }
2784
2785 void
in6_domifdetach(struct ifnet * ifp,void * aux)2786 in6_domifdetach(struct ifnet *ifp, void *aux)
2787 {
2788 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2789
2790 mld_domifdetach(ifp);
2791 scope6_ifdetach(ext->scope6_id);
2792 nd6_ifdetach(ext->nd_ifinfo);
2793 lltable_free(ext->lltable);
2794 COUNTER_ARRAY_FREE(ext->in6_ifstat,
2795 sizeof(struct in6_ifstat) / sizeof(uint64_t));
2796 free(ext->in6_ifstat, M_IFADDR);
2797 COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2798 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2799 free(ext->icmp6_ifstat, M_IFADDR);
2800 free(ext, M_IFADDR);
2801 }
2802
2803 /*
2804 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2805 * v4 mapped addr or v4 compat addr
2806 */
2807 void
in6_sin6_2_sin(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2808 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2809 {
2810
2811 bzero(sin, sizeof(*sin));
2812 sin->sin_len = sizeof(struct sockaddr_in);
2813 sin->sin_family = AF_INET;
2814 sin->sin_port = sin6->sin6_port;
2815 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2816 }
2817
2818 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2819 void
in6_sin_2_v4mapsin6(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2820 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2821 {
2822 bzero(sin6, sizeof(*sin6));
2823 sin6->sin6_len = sizeof(struct sockaddr_in6);
2824 sin6->sin6_family = AF_INET6;
2825 sin6->sin6_port = sin->sin_port;
2826 sin6->sin6_addr.s6_addr32[0] = 0;
2827 sin6->sin6_addr.s6_addr32[1] = 0;
2828 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2829 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2830 }
2831
2832 /* Convert sockaddr_in6 into sockaddr_in. */
2833 void
in6_sin6_2_sin_in_sock(struct sockaddr * nam)2834 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2835 {
2836 struct sockaddr_in *sin_p;
2837 struct sockaddr_in6 sin6;
2838
2839 /*
2840 * Save original sockaddr_in6 addr and convert it
2841 * to sockaddr_in.
2842 */
2843 sin6 = *(struct sockaddr_in6 *)nam;
2844 sin_p = (struct sockaddr_in *)nam;
2845 in6_sin6_2_sin(sin_p, &sin6);
2846 }
2847
2848 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2849 void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr ** nam)2850 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2851 {
2852 struct sockaddr_in *sin_p;
2853 struct sockaddr_in6 *sin6_p;
2854
2855 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2856 sin_p = (struct sockaddr_in *)*nam;
2857 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2858 free(*nam, M_SONAME);
2859 *nam = (struct sockaddr *)sin6_p;
2860 }
2861