FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in.c 8.2 (Berkeley) 11/15/93
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD: releng/9.2/sys/netinet6/in6.c 255444 2013-09-10 10:08:20Z des $");
65
66 #include "opt_compat.h"
67 #include "opt_inet.h"
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/errno.h>
72 #include <sys/jail.h>
73 #include <sys/malloc.h>
74 #include <sys/socket.h>
75 #include <sys/socketvar.h>
76 #include <sys/sockio.h>
77 #include <sys/systm.h>
78 #include <sys/priv.h>
79 #include <sys/proc.h>
80 #include <sys/time.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83
84 #include <net/if.h>
85 #include <net/if_var.h>
86 #include <net/if_types.h>
87 #include <net/route.h>
88 #include <net/if_dl.h>
89 #include <net/vnet.h>
90
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <net/if_llatbl.h>
94 #include <netinet/if_ether.h>
95 #include <netinet/in_systm.h>
96 #include <netinet/ip.h>
97 #include <netinet/in_pcb.h>
98
99 #include <netinet/ip6.h>
100 #include <netinet6/ip6_var.h>
101 #include <netinet6/nd6.h>
102 #include <netinet6/mld6_var.h>
103 #include <netinet6/ip6_mroute.h>
104 #include <netinet6/in6_ifattach.h>
105 #include <netinet6/scope6_var.h>
106 #include <netinet6/in6_pcb.h>
107
108 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
109 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
110
111 /*
112 * Definitions of some costant IP6 addresses.
113 */
114 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
115 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
116 const struct in6_addr in6addr_nodelocal_allnodes =
117 IN6ADDR_NODELOCAL_ALLNODES_INIT;
118 const struct in6_addr in6addr_linklocal_allnodes =
119 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
120 const struct in6_addr in6addr_linklocal_allrouters =
121 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
122 const struct in6_addr in6addr_linklocal_allv2routers =
123 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
124
125 const struct in6_addr in6mask0 = IN6MASK0;
126 const struct in6_addr in6mask32 = IN6MASK32;
127 const struct in6_addr in6mask64 = IN6MASK64;
128 const struct in6_addr in6mask96 = IN6MASK96;
129 const struct in6_addr in6mask128 = IN6MASK128;
130
131 const struct sockaddr_in6 sa6_any =
132 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
133
134 static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t,
135 struct ifnet *, struct thread *);
136 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
137 struct sockaddr_in6 *, int);
138 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
139
140 int (*faithprefix_p)(struct in6_addr *);
141
142 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
143 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
144
145 void
146 in6_ifaddloop(struct ifaddr *ifa)
147 {
148 struct sockaddr_dl gateway;
149 struct sockaddr_in6 mask, addr;
150 struct rtentry rt;
151 struct in6_ifaddr *ia;
152 struct ifnet *ifp;
153 struct llentry *ln;
154
155 ia = ifa2ia6(ifa);
156 ifp = ifa->ifa_ifp;
157 IF_AFDATA_LOCK(ifp);
158 ifa->ifa_rtrequest = nd6_rtrequest;
159 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
160 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
161 IF_AFDATA_UNLOCK(ifp);
162 if (ln != NULL) {
163 ln->la_expire = 0; /* for IPv6 this means permanent */
164 ln->ln_state = ND6_LLINFO_REACHABLE;
165 /*
166 * initialize for rtmsg generation
167 */
168 bzero(&gateway, sizeof(gateway));
169 gateway.sdl_len = sizeof(gateway);
170 gateway.sdl_family = AF_LINK;
171 gateway.sdl_nlen = 0;
172 gateway.sdl_alen = 6;
173 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
174 sizeof(ln->ll_addr));
175 LLE_WUNLOCK(ln);
176 }
177
178 bzero(&rt, sizeof(rt));
179 rt.rt_gateway = (struct sockaddr *)&gateway;
180 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
181 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
182 rt_mask(&rt) = (struct sockaddr *)&mask;
183 rt_key(&rt) = (struct sockaddr *)&addr;
184 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
185 /* Announce arrival of local address to all FIBs. */
186 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
187 }
188
189 void
190 in6_ifremloop(struct ifaddr *ifa)
191 {
192 struct sockaddr_dl gateway;
193 struct sockaddr_in6 mask, addr;
194 struct rtentry rt0;
195 struct in6_ifaddr *ia;
196 struct ifnet *ifp;
197
198 ia = ifa2ia6(ifa);
199 ifp = ifa->ifa_ifp;
200 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
201 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
202 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr,
203 (struct sockaddr *)&mask, LLE_STATIC);
204
205 /*
206 * initialize for rtmsg generation
207 */
208 bzero(&gateway, sizeof(gateway));
209 gateway.sdl_len = sizeof(gateway);
210 gateway.sdl_family = AF_LINK;
211 gateway.sdl_nlen = 0;
212 gateway.sdl_alen = ifp->if_addrlen;
213 bzero(&rt0, sizeof(rt0));
214 rt0.rt_gateway = (struct sockaddr *)&gateway;
215 rt_mask(&rt0) = (struct sockaddr *)&mask;
216 rt_key(&rt0) = (struct sockaddr *)&addr;
217 rt0.rt_flags = RTF_HOST | RTF_STATIC;
218 /* Announce removal of local address to all FIBs. */
219 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
220 }
221
222 int
223 in6_mask2len(struct in6_addr *mask, u_char *lim0)
224 {
225 int x = 0, y;
226 u_char *lim = lim0, *p;
227
228 /* ignore the scope_id part */
229 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
230 lim = (u_char *)mask + sizeof(*mask);
231 for (p = (u_char *)mask; p < lim; x++, p++) {
232 if (*p != 0xff)
233 break;
234 }
235 y = 0;
236 if (p < lim) {
237 for (y = 0; y < 8; y++) {
238 if ((*p & (0x80 >> y)) == 0)
239 break;
240 }
241 }
242
243 /*
244 * when the limit pointer is given, do a stricter check on the
245 * remaining bits.
246 */
247 if (p < lim) {
248 if (y != 0 && (*p & (0x00ff >> y)) != 0)
249 return (-1);
250 for (p = p + 1; p < lim; p++)
251 if (*p != 0)
252 return (-1);
253 }
254
255 return x * 8 + y;
256 }
257
258 #ifdef COMPAT_FREEBSD32
259 struct in6_ndifreq32 {
260 char ifname[IFNAMSIZ];
261 uint32_t ifindex;
262 };
263 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
264 #endif
265
266 int
267 in6_control(struct socket *so, u_long cmd, caddr_t data,
268 struct ifnet *ifp, struct thread *td)
269 {
270 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
271 struct in6_ifaddr *ia = NULL;
272 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
273 struct sockaddr_in6 *sa6;
274 int error;
275
276 switch (cmd) {
277 case SIOCGETSGCNT_IN6:
278 case SIOCGETMIFCNT_IN6:
279 /*
280 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
281 * We cannot see how that would be needed, so do not adjust the
282 * KPI blindly; more likely should clean up the IPv4 variant.
283 */
284 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
285 }
286
287 switch(cmd) {
288 case SIOCAADDRCTL_POLICY:
289 case SIOCDADDRCTL_POLICY:
290 if (td != NULL) {
291 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
292 if (error)
293 return (error);
294 }
295 return (in6_src_ioctl(cmd, data));
296 }
297
298 if (ifp == NULL)
299 return (EOPNOTSUPP);
300
301 switch (cmd) {
302 case SIOCSNDFLUSH_IN6:
303 case SIOCSPFXFLUSH_IN6:
304 case SIOCSRTRFLUSH_IN6:
305 case SIOCSDEFIFACE_IN6:
306 case SIOCSIFINFO_FLAGS:
307 case SIOCSIFINFO_IN6:
308 if (td != NULL) {
309 error = priv_check(td, PRIV_NETINET_ND6);
310 if (error)
311 return (error);
312 }
313 /* FALLTHROUGH */
314 case OSIOCGIFINFO_IN6:
315 case SIOCGIFINFO_IN6:
316 case SIOCGDRLST_IN6:
317 case SIOCGPRLST_IN6:
318 case SIOCGNBRINFO_IN6:
319 case SIOCGDEFIFACE_IN6:
320 return (nd6_ioctl(cmd, data, ifp));
321
322 #ifdef COMPAT_FREEBSD32
323 case SIOCGDEFIFACE32_IN6:
324 {
325 struct in6_ndifreq ndif;
326 struct in6_ndifreq32 *ndif32;
327
328 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
329 ifp);
330 if (error)
331 return (error);
332 ndif32 = (struct in6_ndifreq32 *)data;
333 ndif32->ifindex = ndif.ifindex;
334 return (0);
335 }
336 #endif
337 }
338
339 switch (cmd) {
340 case SIOCSIFPREFIX_IN6:
341 case SIOCDIFPREFIX_IN6:
342 case SIOCAIFPREFIX_IN6:
343 case SIOCCIFPREFIX_IN6:
344 case SIOCSGIFPREFIX_IN6:
345 case SIOCGIFPREFIX_IN6:
346 log(LOG_NOTICE,
347 "prefix ioctls are now invalidated. "
348 "please use ifconfig.\n");
349 return (EOPNOTSUPP);
350 }
351
352 switch (cmd) {
353 case SIOCSSCOPE6:
354 if (td != NULL) {
355 error = priv_check(td, PRIV_NETINET_SCOPE6);
356 if (error)
357 return (error);
358 }
359 return (scope6_set(ifp,
360 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
361 case SIOCGSCOPE6:
362 return (scope6_get(ifp,
363 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
364 case SIOCGSCOPE6DEF:
365 return (scope6_get_default((struct scope6_id *)
366 ifr->ifr_ifru.ifru_scope_id));
367 }
368
369 switch (cmd) {
370 case SIOCALIFADDR:
371 if (td != NULL) {
372 error = priv_check(td, PRIV_NET_ADDIFADDR);
373 if (error)
374 return (error);
375 }
376 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
377
378 case SIOCDLIFADDR:
379 if (td != NULL) {
380 error = priv_check(td, PRIV_NET_DELIFADDR);
381 if (error)
382 return (error);
383 }
384 /* FALLTHROUGH */
385 case SIOCGLIFADDR:
386 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
387 }
388
389 /*
390 * Find address for this interface, if it exists.
391 *
392 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
393 * only, and used the first interface address as the target of other
394 * operations (without checking ifra_addr). This was because netinet
395 * code/API assumed at most 1 interface address per interface.
396 * Since IPv6 allows a node to assign multiple addresses
397 * on a single interface, we almost always look and check the
398 * presence of ifra_addr, and reject invalid ones here.
399 * It also decreases duplicated code among SIOC*_IN6 operations.
400 */
401 switch (cmd) {
402 case SIOCAIFADDR_IN6:
403 case SIOCSIFPHYADDR_IN6:
404 sa6 = &ifra->ifra_addr;
405 break;
406 case SIOCSIFADDR_IN6:
407 case SIOCGIFADDR_IN6:
408 case SIOCSIFDSTADDR_IN6:
409 case SIOCSIFNETMASK_IN6:
410 case SIOCGIFDSTADDR_IN6:
411 case SIOCGIFNETMASK_IN6:
412 case SIOCDIFADDR_IN6:
413 case SIOCGIFPSRCADDR_IN6:
414 case SIOCGIFPDSTADDR_IN6:
415 case SIOCGIFAFLAG_IN6:
416 case SIOCSNDFLUSH_IN6:
417 case SIOCSPFXFLUSH_IN6:
418 case SIOCSRTRFLUSH_IN6:
419 case SIOCGIFALIFETIME_IN6:
420 case SIOCSIFALIFETIME_IN6:
421 case SIOCGIFSTAT_IN6:
422 case SIOCGIFSTAT_ICMP6:
423 sa6 = &ifr->ifr_addr;
424 break;
425 case SIOCSIFADDR:
426 case SIOCSIFBRDADDR:
427 case SIOCSIFDSTADDR:
428 case SIOCSIFNETMASK:
429 /*
430 * Although we should pass any non-INET6 ioctl requests
431 * down to driver, we filter some legacy INET requests.
432 * Drivers trust SIOCSIFADDR et al to come from an already
433 * privileged layer, and do not perform any credentials
434 * checks or input validation.
435 */
436 return (EINVAL);
437 default:
438 sa6 = NULL;
439 break;
440 }
441 if (sa6 && sa6->sin6_family == AF_INET6) {
442 if (sa6->sin6_scope_id != 0)
443 error = sa6_embedscope(sa6, 0);
444 else
445 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
446 if (error != 0)
447 return (error);
448 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
449 &sa6->sin6_addr)) != 0)
450 return (error);
451 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
452 } else
453 ia = NULL;
454
455 switch (cmd) {
456 case SIOCSIFADDR_IN6:
457 case SIOCSIFDSTADDR_IN6:
458 case SIOCSIFNETMASK_IN6:
459 /*
460 * Since IPv6 allows a node to assign multiple addresses
461 * on a single interface, SIOCSIFxxx ioctls are deprecated.
462 */
463 /* we decided to obsolete this command (20000704) */
464 error = EINVAL;
465 goto out;
466
467 case SIOCDIFADDR_IN6:
468 /*
469 * for IPv4, we look for existing in_ifaddr here to allow
470 * "ifconfig if0 delete" to remove the first IPv4 address on
471 * the interface. For IPv6, as the spec allows multiple
472 * interface address from the day one, we consider "remove the
473 * first one" semantics to be not preferable.
474 */
475 if (ia == NULL) {
476 error = EADDRNOTAVAIL;
477 goto out;
478 }
479 /* FALLTHROUGH */
480 case SIOCAIFADDR_IN6:
481 /*
482 * We always require users to specify a valid IPv6 address for
483 * the corresponding operation.
484 */
485 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
486 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
487 error = EAFNOSUPPORT;
488 goto out;
489 }
490
491 if (td != NULL) {
492 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
493 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
494 if (error)
495 goto out;
496 }
497 break;
498
499 case SIOCGIFADDR_IN6:
500 /* This interface is basically deprecated. use SIOCGIFCONF. */
501 /* FALLTHROUGH */
502 case SIOCGIFAFLAG_IN6:
503 case SIOCGIFNETMASK_IN6:
504 case SIOCGIFDSTADDR_IN6:
505 case SIOCGIFALIFETIME_IN6:
506 /* must think again about its semantics */
507 if (ia == NULL) {
508 error = EADDRNOTAVAIL;
509 goto out;
510 }
511 break;
512
513 case SIOCSIFALIFETIME_IN6:
514 {
515 struct in6_addrlifetime *lt;
516
517 if (td != NULL) {
518 error = priv_check(td, PRIV_NETINET_ALIFETIME6);
519 if (error)
520 goto out;
521 }
522 if (ia == NULL) {
523 error = EADDRNOTAVAIL;
524 goto out;
525 }
526 /* sanity for overflow - beware unsigned */
527 lt = &ifr->ifr_ifru.ifru_lifetime;
528 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
529 lt->ia6t_vltime + time_second < time_second) {
530 error = EINVAL;
531 goto out;
532 }
533 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
534 lt->ia6t_pltime + time_second < time_second) {
535 error = EINVAL;
536 goto out;
537 }
538 break;
539 }
540 }
541
542 switch (cmd) {
543 case SIOCGIFADDR_IN6:
544 ifr->ifr_addr = ia->ia_addr;
545 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
546 goto out;
547 break;
548
549 case SIOCGIFDSTADDR_IN6:
550 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
551 error = EINVAL;
552 goto out;
553 }
554 /*
555 * XXX: should we check if ifa_dstaddr is NULL and return
556 * an error?
557 */
558 ifr->ifr_dstaddr = ia->ia_dstaddr;
559 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
560 goto out;
561 break;
562
563 case SIOCGIFNETMASK_IN6:
564 ifr->ifr_addr = ia->ia_prefixmask;
565 break;
566
567 case SIOCGIFAFLAG_IN6:
568 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
569 break;
570
571 case SIOCGIFSTAT_IN6:
572 if (ifp == NULL) {
573 error = EINVAL;
574 goto out;
575 }
576 bzero(&ifr->ifr_ifru.ifru_stat,
577 sizeof(ifr->ifr_ifru.ifru_stat));
578 ifr->ifr_ifru.ifru_stat =
579 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
580 break;
581
582 case SIOCGIFSTAT_ICMP6:
583 if (ifp == NULL) {
584 error = EINVAL;
585 goto out;
586 }
587 bzero(&ifr->ifr_ifru.ifru_icmp6stat,
588 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
589 ifr->ifr_ifru.ifru_icmp6stat =
590 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
591 break;
592
593 case SIOCGIFALIFETIME_IN6:
594 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
595 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
596 time_t maxexpire;
597 struct in6_addrlifetime *retlt =
598 &ifr->ifr_ifru.ifru_lifetime;
599
600 /*
601 * XXX: adjust expiration time assuming time_t is
602 * signed.
603 */
604 maxexpire = (-1) &
605 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
606 if (ia->ia6_lifetime.ia6t_vltime <
607 maxexpire - ia->ia6_updatetime) {
608 retlt->ia6t_expire = ia->ia6_updatetime +
609 ia->ia6_lifetime.ia6t_vltime;
610 } else
611 retlt->ia6t_expire = maxexpire;
612 }
613 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
614 time_t maxexpire;
615 struct in6_addrlifetime *retlt =
616 &ifr->ifr_ifru.ifru_lifetime;
617
618 /*
619 * XXX: adjust expiration time assuming time_t is
620 * signed.
621 */
622 maxexpire = (-1) &
623 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
624 if (ia->ia6_lifetime.ia6t_pltime <
625 maxexpire - ia->ia6_updatetime) {
626 retlt->ia6t_preferred = ia->ia6_updatetime +
627 ia->ia6_lifetime.ia6t_pltime;
628 } else
629 retlt->ia6t_preferred = maxexpire;
630 }
631 break;
632
633 case SIOCSIFALIFETIME_IN6:
634 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
635 /* for sanity */
636 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
637 ia->ia6_lifetime.ia6t_expire =
638 time_second + ia->ia6_lifetime.ia6t_vltime;
639 } else
640 ia->ia6_lifetime.ia6t_expire = 0;
641 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
642 ia->ia6_lifetime.ia6t_preferred =
643 time_second + ia->ia6_lifetime.ia6t_pltime;
644 } else
645 ia->ia6_lifetime.ia6t_preferred = 0;
646 break;
647
648 case SIOCAIFADDR_IN6:
649 {
650 int i;
651 struct nd_prefixctl pr0;
652 struct nd_prefix *pr;
653
654 /*
655 * first, make or update the interface address structure,
656 * and link it to the list.
657 */
658 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
659 goto out;
660 if (ia != NULL)
661 ifa_free(&ia->ia_ifa);
662 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
663 == NULL) {
664 /*
665 * this can happen when the user specify the 0 valid
666 * lifetime.
667 */
668 break;
669 }
670
671 /*
672 * then, make the prefix on-link on the interface.
673 * XXX: we'd rather create the prefix before the address, but
674 * we need at least one address to install the corresponding
675 * interface route, so we configure the address first.
676 */
677
678 /*
679 * convert mask to prefix length (prefixmask has already
680 * been validated in in6_update_ifa().
681 */
682 bzero(&pr0, sizeof(pr0));
683 pr0.ndpr_ifp = ifp;
684 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
685 NULL);
686 if (pr0.ndpr_plen == 128) {
687 break; /* we don't need to install a host route. */
688 }
689 pr0.ndpr_prefix = ifra->ifra_addr;
690 /* apply the mask for safety. */
691 for (i = 0; i < 4; i++) {
692 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
693 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
694 }
695 /*
696 * XXX: since we don't have an API to set prefix (not address)
697 * lifetimes, we just use the same lifetimes as addresses.
698 * The (temporarily) installed lifetimes can be overridden by
699 * later advertised RAs (when accept_rtadv is non 0), which is
700 * an intended behavior.
701 */
702 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
703 pr0.ndpr_raf_auto =
704 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
705 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
706 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
707
708 /* add the prefix if not yet. */
709 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
710 /*
711 * nd6_prelist_add will install the corresponding
712 * interface route.
713 */
714 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
715 goto out;
716 if (pr == NULL) {
717 log(LOG_ERR, "nd6_prelist_add succeeded but "
718 "no prefix\n");
719 error = EINVAL;
720 goto out;
721 }
722 }
723
724 /* relate the address to the prefix */
725 if (ia->ia6_ndpr == NULL) {
726 ia->ia6_ndpr = pr;
727 pr->ndpr_refcnt++;
728
729 /*
730 * If this is the first autoconf address from the
731 * prefix, create a temporary address as well
732 * (when required).
733 */
734 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
735 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
736 int e;
737 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
738 log(LOG_NOTICE, "in6_control: failed "
739 "to create a temporary address, "
740 "errno=%d\n", e);
741 }
742 }
743 }
744
745 /*
746 * this might affect the status of autoconfigured addresses,
747 * that is, this address might make other addresses detached.
748 */
749 pfxlist_onlink_check();
750 if (error == 0 && ia) {
751 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
752 /*
753 * Try to clear the flag when a new
754 * IPv6 address is added onto an
755 * IFDISABLED interface and it
756 * succeeds.
757 */
758 struct in6_ndireq nd;
759
760 memset(&nd, 0, sizeof(nd));
761 nd.ndi.flags = ND_IFINFO(ifp)->flags;
762 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
763 if (nd6_ioctl(SIOCSIFINFO_FLAGS,
764 (caddr_t)&nd, ifp) < 0)
765 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
766 "SIOCSIFINFO_FLAGS for -ifdisabled "
767 "failed.");
768 /*
769 * Ignore failure of clearing the flag
770 * intentionally. The failure means
771 * address duplication was detected.
772 */
773 }
774 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
775 }
776 break;
777 }
778
779 case SIOCDIFADDR_IN6:
780 {
781 struct nd_prefix *pr;
782
783 /*
784 * If the address being deleted is the only one that owns
785 * the corresponding prefix, expire the prefix as well.
786 * XXX: theoretically, we don't have to worry about such
787 * relationship, since we separate the address management
788 * and the prefix management. We do this, however, to provide
789 * as much backward compatibility as possible in terms of
790 * the ioctl operation.
791 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
792 */
793 pr = ia->ia6_ndpr;
794 in6_purgeaddr(&ia->ia_ifa);
795 if (pr && pr->ndpr_refcnt == 0)
796 prelist_remove(pr);
797 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
798 break;
799 }
800
801 default:
802 if (ifp == NULL || ifp->if_ioctl == 0) {
803 error = EOPNOTSUPP;
804 goto out;
805 }
806 error = (*ifp->if_ioctl)(ifp, cmd, data);
807 goto out;
808 }
809
810 error = 0;
811 out:
812 if (ia != NULL)
813 ifa_free(&ia->ia_ifa);
814 return (error);
815 }
816
817
818 /*
819 * Join necessary multicast groups. Factored out from in6_update_ifa().
820 * This entire work should only be done once, for the default FIB.
821 */
822 static int
823 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
824 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
825 {
826 char ip6buf[INET6_ADDRSTRLEN];
827 struct sockaddr_in6 mltaddr, mltmask;
828 struct in6_addr llsol;
829 struct in6_multi_mship *imm;
830 struct rtentry *rt;
831 int delay, error;
832
833 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
834
835 /* Join solicited multicast addr for new host id. */
836 bzero(&llsol, sizeof(struct in6_addr));
837 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
838 llsol.s6_addr32[1] = 0;
839 llsol.s6_addr32[2] = htonl(1);
840 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
841 llsol.s6_addr8[12] = 0xff;
842 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
843 /* XXX: should not happen */
844 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
845 goto cleanup;
846 }
847 delay = 0;
848 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
849 /*
850 * We need a random delay for DAD on the address being
851 * configured. It also means delaying transmission of the
852 * corresponding MLD report to avoid report collision.
853 * [RFC 4861, Section 6.3.7]
854 */
855 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
856 }
857 imm = in6_joingroup(ifp, &llsol, &error, delay);
858 if (imm == NULL) {
859 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
860 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
861 if_name(ifp), error));
862 goto cleanup;
863 }
864 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
865 *in6m_sol = imm->i6mm_maddr;
866
867 bzero(&mltmask, sizeof(mltmask));
868 mltmask.sin6_len = sizeof(struct sockaddr_in6);
869 mltmask.sin6_family = AF_INET6;
870 mltmask.sin6_addr = in6mask32;
871 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
872
873 /*
874 * Join link-local all-nodes address.
875 */
876 bzero(&mltaddr, sizeof(mltaddr));
877 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
878 mltaddr.sin6_family = AF_INET6;
879 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
880 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
881 goto cleanup; /* XXX: should not fail */
882
883 /*
884 * XXX: do we really need this automatic routes? We should probably
885 * reconsider this stuff. Most applications actually do not need the
886 * routes, since they usually specify the outgoing interface.
887 */
888 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
889 if (rt != NULL) {
890 /* XXX: only works in !SCOPEDROUTING case. */
891 if (memcmp(&mltaddr.sin6_addr,
892 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
893 MLTMASK_LEN)) {
894 RTFREE_LOCKED(rt);
895 rt = NULL;
896 }
897 }
898 if (rt == NULL) {
899 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
900 (struct sockaddr *)&ia->ia_addr,
901 (struct sockaddr *)&mltmask, RTF_UP,
902 (struct rtentry **)0, RT_DEFAULT_FIB);
903 if (error)
904 goto cleanup;
905 } else
906 RTFREE_LOCKED(rt);
907
908 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
909 if (imm == NULL) {
910 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
911 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
912 &mltaddr.sin6_addr), if_name(ifp), error));
913 goto cleanup;
914 }
915 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
916
917 /*
918 * Join node information group address.
919 */
920 delay = 0;
921 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
922 /*
923 * The spec does not say anything about delay for this group,
924 * but the same logic should apply.
925 */
926 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
927 }
928 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
929 /* XXX jinmei */
930 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
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 /* XXX not very fatal, go on... */
936 else
937 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
938 }
939 if (V_icmp6_nodeinfo_oldmcprefix &&
940 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
941 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
942 if (imm == NULL)
943 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
944 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
945 &mltaddr.sin6_addr), if_name(ifp), error));
946 /* XXX not very fatal, go on... */
947 else
948 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
949 }
950
951 /*
952 * Join interface-local all-nodes address.
953 * (ff01::1%ifN, and ff01::%ifN/32)
954 */
955 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
956 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
957 goto cleanup; /* XXX: should not fail */
958 /* XXX: again, do we really need the route? */
959 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
960 if (rt != NULL) {
961 if (memcmp(&mltaddr.sin6_addr,
962 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
963 MLTMASK_LEN)) {
964 RTFREE_LOCKED(rt);
965 rt = NULL;
966 }
967 }
968 if (rt == NULL) {
969 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
970 (struct sockaddr *)&ia->ia_addr,
971 (struct sockaddr *)&mltmask, RTF_UP,
972 (struct rtentry **)0, RT_DEFAULT_FIB);
973 if (error)
974 goto cleanup;
975 } else
976 RTFREE_LOCKED(rt);
977
978 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
979 if (imm == NULL) {
980 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
981 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
982 &mltaddr.sin6_addr), if_name(ifp), error));
983 goto cleanup;
984 }
985 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
986 #undef MLTMASK_LEN
987
988 cleanup:
989 return (error);
990 }
991
992 /*
993 * Update parameters of an IPv6 interface address.
994 * If necessary, a new entry is created and linked into address chains.
995 * This function is separated from in6_control().
996 * XXX: should this be performed under splnet()?
997 */
998 int
999 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1000 struct in6_ifaddr *ia, int flags)
1001 {
1002 int error = 0, hostIsNew = 0, plen = -1;
1003 struct sockaddr_in6 dst6;
1004 struct in6_addrlifetime *lt;
1005 struct in6_multi *in6m_sol;
1006 int delay;
1007 char ip6buf[INET6_ADDRSTRLEN];
1008
1009 /* Validate parameters */
1010 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1011 return (EINVAL);
1012
1013 /*
1014 * The destination address for a p2p link must have a family
1015 * of AF_UNSPEC or AF_INET6.
1016 */
1017 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1018 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1019 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1020 return (EAFNOSUPPORT);
1021 /*
1022 * validate ifra_prefixmask. don't check sin6_family, netmask
1023 * does not carry fields other than sin6_len.
1024 */
1025 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1026 return (EINVAL);
1027 /*
1028 * Because the IPv6 address architecture is classless, we require
1029 * users to specify a (non 0) prefix length (mask) for a new address.
1030 * We also require the prefix (when specified) mask is valid, and thus
1031 * reject a non-consecutive mask.
1032 */
1033 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1034 return (EINVAL);
1035 if (ifra->ifra_prefixmask.sin6_len != 0) {
1036 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1037 (u_char *)&ifra->ifra_prefixmask +
1038 ifra->ifra_prefixmask.sin6_len);
1039 if (plen <= 0)
1040 return (EINVAL);
1041 } else {
1042 /*
1043 * In this case, ia must not be NULL. We just use its prefix
1044 * length.
1045 */
1046 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1047 }
1048 /*
1049 * If the destination address on a p2p interface is specified,
1050 * and the address is a scoped one, validate/set the scope
1051 * zone identifier.
1052 */
1053 dst6 = ifra->ifra_dstaddr;
1054 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1055 (dst6.sin6_family == AF_INET6)) {
1056 struct in6_addr in6_tmp;
1057 u_int32_t zoneid;
1058
1059 in6_tmp = dst6.sin6_addr;
1060 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1061 return (EINVAL); /* XXX: should be impossible */
1062
1063 if (dst6.sin6_scope_id != 0) {
1064 if (dst6.sin6_scope_id != zoneid)
1065 return (EINVAL);
1066 } else /* user omit to specify the ID. */
1067 dst6.sin6_scope_id = zoneid;
1068
1069 /* convert into the internal form */
1070 if (sa6_embedscope(&dst6, 0))
1071 return (EINVAL); /* XXX: should be impossible */
1072 }
1073 /*
1074 * The destination address can be specified only for a p2p or a
1075 * loopback interface. If specified, the corresponding prefix length
1076 * must be 128.
1077 */
1078 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1079 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1080 /* XXX: noisy message */
1081 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1082 "be specified for a p2p or a loopback IF only\n"));
1083 return (EINVAL);
1084 }
1085 if (plen != 128) {
1086 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1087 "be 128 when dstaddr is specified\n"));
1088 return (EINVAL);
1089 }
1090 }
1091 /* lifetime consistency check */
1092 lt = &ifra->ifra_lifetime;
1093 if (lt->ia6t_pltime > lt->ia6t_vltime)
1094 return (EINVAL);
1095 if (lt->ia6t_vltime == 0) {
1096 /*
1097 * the following log might be noisy, but this is a typical
1098 * configuration mistake or a tool's bug.
1099 */
1100 nd6log((LOG_INFO,
1101 "in6_update_ifa: valid lifetime is 0 for %s\n",
1102 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1103
1104 if (ia == NULL)
1105 return (0); /* there's nothing to do */
1106 }
1107
1108 /*
1109 * If this is a new address, allocate a new ifaddr and link it
1110 * into chains.
1111 */
1112 if (ia == NULL) {
1113 hostIsNew = 1;
1114 /*
1115 * When in6_update_ifa() is called in a process of a received
1116 * RA, it is called under an interrupt context. So, we should
1117 * call malloc with M_NOWAIT.
1118 */
1119 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1120 M_NOWAIT);
1121 if (ia == NULL)
1122 return (ENOBUFS);
1123 bzero((caddr_t)ia, sizeof(*ia));
1124 ifa_init(&ia->ia_ifa);
1125 LIST_INIT(&ia->ia6_memberships);
1126 /* Initialize the address and masks, and put time stamp */
1127 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1128 ia->ia_addr.sin6_family = AF_INET6;
1129 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1130 ia->ia6_createtime = time_second;
1131 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1132 /*
1133 * XXX: some functions expect that ifa_dstaddr is not
1134 * NULL for p2p interfaces.
1135 */
1136 ia->ia_ifa.ifa_dstaddr =
1137 (struct sockaddr *)&ia->ia_dstaddr;
1138 } else {
1139 ia->ia_ifa.ifa_dstaddr = NULL;
1140 }
1141 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1142 ia->ia_ifp = ifp;
1143 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1144 IF_ADDR_WLOCK(ifp);
1145 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1146 IF_ADDR_WUNLOCK(ifp);
1147
1148 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1149 IN6_IFADDR_WLOCK();
1150 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1151 IN6_IFADDR_WUNLOCK();
1152 }
1153
1154 /* update timestamp */
1155 ia->ia6_updatetime = time_second;
1156
1157 /* set prefix mask */
1158 if (ifra->ifra_prefixmask.sin6_len) {
1159 /*
1160 * We prohibit changing the prefix length of an existing
1161 * address, because
1162 * + such an operation should be rare in IPv6, and
1163 * + the operation would confuse prefix management.
1164 */
1165 if (ia->ia_prefixmask.sin6_len &&
1166 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1167 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1168 " existing (%s) address should not be changed\n",
1169 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1170 error = EINVAL;
1171 goto unlink;
1172 }
1173 ia->ia_prefixmask = ifra->ifra_prefixmask;
1174 }
1175
1176 /*
1177 * If a new destination address is specified, scrub the old one and
1178 * install the new destination. Note that the interface must be
1179 * p2p or loopback (see the check above.)
1180 */
1181 if (dst6.sin6_family == AF_INET6 &&
1182 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1183 int e;
1184
1185 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1186 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1187 nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1188 "a route to the old destination: %s\n",
1189 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1190 /* proceed anyway... */
1191 } else
1192 ia->ia_flags &= ~IFA_ROUTE;
1193 ia->ia_dstaddr = dst6;
1194 }
1195
1196 /*
1197 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1198 * to see if the address is deprecated or invalidated, but initialize
1199 * these members for applications.
1200 */
1201 ia->ia6_lifetime = ifra->ifra_lifetime;
1202 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1203 ia->ia6_lifetime.ia6t_expire =
1204 time_second + ia->ia6_lifetime.ia6t_vltime;
1205 } else
1206 ia->ia6_lifetime.ia6t_expire = 0;
1207 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1208 ia->ia6_lifetime.ia6t_preferred =
1209 time_second + ia->ia6_lifetime.ia6t_pltime;
1210 } else
1211 ia->ia6_lifetime.ia6t_preferred = 0;
1212
1213 /* reset the interface and routing table appropriately. */
1214 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1215 goto unlink;
1216
1217 /*
1218 * configure address flags.
1219 */
1220 ia->ia6_flags = ifra->ifra_flags;
1221 /*
1222 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1223 * userland, make it deprecated.
1224 */
1225 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1226 ia->ia6_lifetime.ia6t_pltime = 0;
1227 ia->ia6_lifetime.ia6t_preferred = time_second;
1228 }
1229 /*
1230 * Make the address tentative before joining multicast addresses,
1231 * so that corresponding MLD responses would not have a tentative
1232 * source address.
1233 */
1234 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1235 if (hostIsNew && in6if_do_dad(ifp))
1236 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1237
1238 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1239 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1240 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1241
1242 /*
1243 * We are done if we have simply modified an existing address.
1244 */
1245 if (!hostIsNew)
1246 return (error);
1247
1248 /*
1249 * Beyond this point, we should call in6_purgeaddr upon an error,
1250 * not just go to unlink.
1251 */
1252
1253 /* Join necessary multicast groups. */
1254 in6m_sol = NULL;
1255 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1256 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1257 if (error)
1258 goto cleanup;
1259 }
1260
1261 /*
1262 * Perform DAD, if needed.
1263 * XXX It may be of use, if we can administratively disable DAD.
1264 */
1265 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1266 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1267 {
1268 int mindelay, maxdelay;
1269
1270 delay = 0;
1271 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1272 /*
1273 * We need to impose a delay before sending an NS
1274 * for DAD. Check if we also needed a delay for the
1275 * corresponding MLD message. If we did, the delay
1276 * should be larger than the MLD delay (this could be
1277 * relaxed a bit, but this simple logic is at least
1278 * safe).
1279 * XXX: Break data hiding guidelines and look at
1280 * state for the solicited multicast group.
1281 */
1282 mindelay = 0;
1283 if (in6m_sol != NULL &&
1284 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1285 mindelay = in6m_sol->in6m_timer;
1286 }
1287 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1288 if (maxdelay - mindelay == 0)
1289 delay = 0;
1290 else {
1291 delay =
1292 (arc4random() % (maxdelay - mindelay)) +
1293 mindelay;
1294 }
1295 }
1296 nd6_dad_start((struct ifaddr *)ia, delay);
1297 }
1298
1299 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1300 ifa_free(&ia->ia_ifa);
1301 return (error);
1302
1303 unlink:
1304 /*
1305 * XXX: if a change of an existing address failed, keep the entry
1306 * anyway.
1307 */
1308 if (hostIsNew) {
1309 in6_unlink_ifa(ia, ifp);
1310 ifa_free(&ia->ia_ifa);
1311 }
1312 return (error);
1313
1314 cleanup:
1315 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1316 ifa_free(&ia->ia_ifa);
1317 in6_purgeaddr(&ia->ia_ifa);
1318 return error;
1319 }
1320
1321 /*
1322 * Leave multicast groups. Factored out from in6_purgeaddr().
1323 * This entire work should only be done once, for the default FIB.
1324 */
1325 static int
1326 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1327 {
1328 struct sockaddr_in6 mltaddr, mltmask;
1329 struct in6_multi_mship *imm;
1330 struct rtentry *rt;
1331 struct sockaddr_in6 sin6;
1332 int error;
1333
1334 /*
1335 * Leave from multicast groups we have joined for the interface.
1336 */
1337 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1338 LIST_REMOVE(imm, i6mm_chain);
1339 in6_leavegroup(imm);
1340 }
1341
1342 /*
1343 * Remove the link-local all-nodes address.
1344 */
1345 bzero(&mltmask, sizeof(mltmask));
1346 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1347 mltmask.sin6_family = AF_INET6;
1348 mltmask.sin6_addr = in6mask32;
1349
1350 bzero(&mltaddr, sizeof(mltaddr));
1351 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1352 mltaddr.sin6_family = AF_INET6;
1353 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1354
1355 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1356 return (error);
1357
1358 /*
1359 * As for the mltaddr above, proactively prepare the sin6 to avoid
1360 * rtentry un- and re-locking.
1361 */
1362 if (ifa0 != NULL) {
1363 bzero(&sin6, sizeof(sin6));
1364 sin6.sin6_len = sizeof(sin6);
1365 sin6.sin6_family = AF_INET6;
1366 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1367 sizeof(sin6.sin6_addr));
1368 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1369 if (error != 0)
1370 return (error);
1371 }
1372
1373 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1374 if (rt != NULL && rt->rt_gateway != NULL &&
1375 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1376 &ia->ia_addr.sin6_addr,
1377 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1378 /*
1379 * If no more IPv6 address exists on this interface then
1380 * remove the multicast address route.
1381 */
1382 if (ifa0 == NULL) {
1383 memcpy(&mltaddr.sin6_addr,
1384 &satosin6(rt_key(rt))->sin6_addr,
1385 sizeof(mltaddr.sin6_addr));
1386 RTFREE_LOCKED(rt);
1387 error = in6_rtrequest(RTM_DELETE,
1388 (struct sockaddr *)&mltaddr,
1389 (struct sockaddr *)&ia->ia_addr,
1390 (struct sockaddr *)&mltmask, RTF_UP,
1391 (struct rtentry **)0, RT_DEFAULT_FIB);
1392 if (error)
1393 log(LOG_INFO, "%s: link-local all-nodes "
1394 "multicast address deletion error\n",
1395 __func__);
1396 } else {
1397 /*
1398 * Replace the gateway of the route.
1399 */
1400 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1401 RTFREE_LOCKED(rt);
1402 }
1403 } else {
1404 if (rt != NULL)
1405 RTFREE_LOCKED(rt);
1406 }
1407
1408 /*
1409 * Remove the node-local all-nodes address.
1410 */
1411 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1412 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1413 return (error);
1414
1415 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1416 if (rt != NULL && rt->rt_gateway != NULL &&
1417 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1418 &ia->ia_addr.sin6_addr,
1419 sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1420 /*
1421 * If no more IPv6 address exists on this interface then
1422 * remove the multicast address route.
1423 */
1424 if (ifa0 == NULL) {
1425 memcpy(&mltaddr.sin6_addr,
1426 &satosin6(rt_key(rt))->sin6_addr,
1427 sizeof(mltaddr.sin6_addr));
1428
1429 RTFREE_LOCKED(rt);
1430 error = in6_rtrequest(RTM_DELETE,
1431 (struct sockaddr *)&mltaddr,
1432 (struct sockaddr *)&ia->ia_addr,
1433 (struct sockaddr *)&mltmask, RTF_UP,
1434 (struct rtentry **)0, RT_DEFAULT_FIB);
1435 if (error)
1436 log(LOG_INFO, "%s: node-local all-nodes"
1437 "multicast address deletion error\n",
1438 __func__);
1439 } else {
1440 /*
1441 * Replace the gateway of the route.
1442 */
1443 memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1444 RTFREE_LOCKED(rt);
1445 }
1446 } else {
1447 if (rt != NULL)
1448 RTFREE_LOCKED(rt);
1449 }
1450
1451 return (0);
1452 }
1453
1454 void
1455 in6_purgeaddr(struct ifaddr *ifa)
1456 {
1457 struct ifnet *ifp = ifa->ifa_ifp;
1458 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1459 int plen, error;
1460 struct ifaddr *ifa0;
1461
1462 /*
1463 * find another IPv6 address as the gateway for the
1464 * link-local and node-local all-nodes multicast
1465 * address routes
1466 */
1467 IF_ADDR_RLOCK(ifp);
1468 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1469 if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1470 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1471 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1472 continue;
1473 else
1474 break;
1475 }
1476 if (ifa0 != NULL)
1477 ifa_ref(ifa0);
1478 IF_ADDR_RUNLOCK(ifp);
1479
1480 /*
1481 * Remove the loopback route to the interface address.
1482 * The check for the current setting of "nd6_useloopback"
1483 * is not needed.
1484 */
1485 if (ia->ia_flags & IFA_RTSELF) {
1486 error = ifa_del_loopback_route((struct ifaddr *)ia,
1487 (struct sockaddr *)&ia->ia_addr);
1488 if (error == 0)
1489 ia->ia_flags &= ~IFA_RTSELF;
1490 }
1491
1492 /* stop DAD processing */
1493 nd6_dad_stop(ifa);
1494
1495 /* Remove local address entry from lltable. */
1496 in6_ifremloop(ifa);
1497
1498 /* Leave multicast groups. */
1499 error = in6_purgeaddr_mc(ifp, ia, ifa0);
1500
1501 if (ifa0 != NULL)
1502 ifa_free(ifa0);
1503
1504 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1505 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1506 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1507 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1508 if (error != 0)
1509 log(LOG_INFO, "%s: err=%d, destination address delete "
1510 "failed\n", __func__, error);
1511 ia->ia_flags &= ~IFA_ROUTE;
1512 }
1513
1514 in6_unlink_ifa(ia, ifp);
1515 }
1516
1517 static void
1518 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1519 {
1520 int s = splnet();
1521
1522 IF_ADDR_WLOCK(ifp);
1523 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1524 IF_ADDR_WUNLOCK(ifp);
1525 ifa_free(&ia->ia_ifa); /* if_addrhead */
1526
1527 /*
1528 * Defer the release of what might be the last reference to the
1529 * in6_ifaddr so that it can't be freed before the remainder of the
1530 * cleanup.
1531 */
1532 IN6_IFADDR_WLOCK();
1533 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1534 IN6_IFADDR_WUNLOCK();
1535
1536 /*
1537 * Release the reference to the base prefix. There should be a
1538 * positive reference.
1539 */
1540 if (ia->ia6_ndpr == NULL) {
1541 nd6log((LOG_NOTICE,
1542 "in6_unlink_ifa: autoconf'ed address "
1543 "%p has no prefix\n", ia));
1544 } else {
1545 ia->ia6_ndpr->ndpr_refcnt--;
1546 ia->ia6_ndpr = NULL;
1547 }
1548
1549 /*
1550 * Also, if the address being removed is autoconf'ed, call
1551 * pfxlist_onlink_check() since the release might affect the status of
1552 * other (detached) addresses.
1553 */
1554 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1555 pfxlist_onlink_check();
1556 }
1557 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1558 splx(s);
1559 }
1560
1561 void
1562 in6_purgeif(struct ifnet *ifp)
1563 {
1564 struct ifaddr *ifa, *nifa;
1565
1566 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1567 if (ifa->ifa_addr->sa_family != AF_INET6)
1568 continue;
1569 in6_purgeaddr(ifa);
1570 }
1571
1572 in6_ifdetach(ifp);
1573 }
1574
1575 /*
1576 * SIOC[GAD]LIFADDR.
1577 * SIOCGLIFADDR: get first address. (?)
1578 * SIOCGLIFADDR with IFLR_PREFIX:
1579 * get first address that matches the specified prefix.
1580 * SIOCALIFADDR: add the specified address.
1581 * SIOCALIFADDR with IFLR_PREFIX:
1582 * add the specified prefix, filling hostid part from
1583 * the first link-local address. prefixlen must be <= 64.
1584 * SIOCDLIFADDR: delete the specified address.
1585 * SIOCDLIFADDR with IFLR_PREFIX:
1586 * delete the first address that matches the specified prefix.
1587 * return values:
1588 * EINVAL on invalid parameters
1589 * EADDRNOTAVAIL on prefix match failed/specified address not found
1590 * other values may be returned from in6_ioctl()
1591 *
1592 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1593 * this is to accomodate address naming scheme other than RFC2374,
1594 * in the future.
1595 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1596 * address encoding scheme. (see figure on page 8)
1597 */
1598 static int
1599 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1600 struct ifnet *ifp, struct thread *td)
1601 {
1602 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1603 struct ifaddr *ifa;
1604 struct sockaddr *sa;
1605
1606 /* sanity checks */
1607 if (!data || !ifp) {
1608 panic("invalid argument to in6_lifaddr_ioctl");
1609 /* NOTREACHED */
1610 }
1611
1612 switch (cmd) {
1613 case SIOCGLIFADDR:
1614 /* address must be specified on GET with IFLR_PREFIX */
1615 if ((iflr->flags & IFLR_PREFIX) == 0)
1616 break;
1617 /* FALLTHROUGH */
1618 case SIOCALIFADDR:
1619 case SIOCDLIFADDR:
1620 /* address must be specified on ADD and DELETE */
1621 sa = (struct sockaddr *)&iflr->addr;
1622 if (sa->sa_family != AF_INET6)
1623 return EINVAL;
1624 if (sa->sa_len != sizeof(struct sockaddr_in6))
1625 return EINVAL;
1626 /* XXX need improvement */
1627 sa = (struct sockaddr *)&iflr->dstaddr;
1628 if (sa->sa_family && sa->sa_family != AF_INET6)
1629 return EINVAL;
1630 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1631 return EINVAL;
1632 break;
1633 default: /* shouldn't happen */
1634 #if 0
1635 panic("invalid cmd to in6_lifaddr_ioctl");
1636 /* NOTREACHED */
1637 #else
1638 return EOPNOTSUPP;
1639 #endif
1640 }
1641 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1642 return EINVAL;
1643
1644 switch (cmd) {
1645 case SIOCALIFADDR:
1646 {
1647 struct in6_aliasreq ifra;
1648 struct in6_addr *hostid = NULL;
1649 int prefixlen;
1650
1651 ifa = NULL;
1652 if ((iflr->flags & IFLR_PREFIX) != 0) {
1653 struct sockaddr_in6 *sin6;
1654
1655 /*
1656 * hostid is to fill in the hostid part of the
1657 * address. hostid points to the first link-local
1658 * address attached to the interface.
1659 */
1660 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1661 if (!ifa)
1662 return EADDRNOTAVAIL;
1663 hostid = IFA_IN6(ifa);
1664
1665 /* prefixlen must be <= 64. */
1666 if (64 < iflr->prefixlen) {
1667 if (ifa != NULL)
1668 ifa_free(ifa);
1669 return EINVAL;
1670 }
1671 prefixlen = iflr->prefixlen;
1672
1673 /* hostid part must be zero. */
1674 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1675 if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1676 sin6->sin6_addr.s6_addr32[3] != 0) {
1677 if (ifa != NULL)
1678 ifa_free(ifa);
1679 return EINVAL;
1680 }
1681 } else
1682 prefixlen = iflr->prefixlen;
1683
1684 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1685 bzero(&ifra, sizeof(ifra));
1686 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1687
1688 bcopy(&iflr->addr, &ifra.ifra_addr,
1689 ((struct sockaddr *)&iflr->addr)->sa_len);
1690 if (hostid) {
1691 /* fill in hostid part */
1692 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1693 hostid->s6_addr32[2];
1694 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1695 hostid->s6_addr32[3];
1696 }
1697
1698 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1699 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1700 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1701 if (hostid) {
1702 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1703 hostid->s6_addr32[2];
1704 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1705 hostid->s6_addr32[3];
1706 }
1707 }
1708 if (ifa != NULL)
1709 ifa_free(ifa);
1710
1711 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1712 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1713
1714 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1715 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1716 }
1717 case SIOCGLIFADDR:
1718 case SIOCDLIFADDR:
1719 {
1720 struct in6_ifaddr *ia;
1721 struct in6_addr mask, candidate, match;
1722 struct sockaddr_in6 *sin6;
1723 int cmp;
1724
1725 bzero(&mask, sizeof(mask));
1726 if (iflr->flags & IFLR_PREFIX) {
1727 /* lookup a prefix rather than address. */
1728 in6_prefixlen2mask(&mask, iflr->prefixlen);
1729
1730 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1731 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1732 match.s6_addr32[0] &= mask.s6_addr32[0];
1733 match.s6_addr32[1] &= mask.s6_addr32[1];
1734 match.s6_addr32[2] &= mask.s6_addr32[2];
1735 match.s6_addr32[3] &= mask.s6_addr32[3];
1736
1737 /* if you set extra bits, that's wrong */
1738 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1739 return EINVAL;
1740
1741 cmp = 1;
1742 } else {
1743 if (cmd == SIOCGLIFADDR) {
1744 /* on getting an address, take the 1st match */
1745 cmp = 0; /* XXX */
1746 } else {
1747 /* on deleting an address, do exact match */
1748 in6_prefixlen2mask(&mask, 128);
1749 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1750 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1751
1752 cmp = 1;
1753 }
1754 }
1755
1756 IF_ADDR_RLOCK(ifp);
1757 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1758 if (ifa->ifa_addr->sa_family != AF_INET6)
1759 continue;
1760 if (!cmp)
1761 break;
1762
1763 /*
1764 * XXX: this is adhoc, but is necessary to allow
1765 * a user to specify fe80::/64 (not /10) for a
1766 * link-local address.
1767 */
1768 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1769 in6_clearscope(&candidate);
1770 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1771 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1772 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1773 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1774 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1775 break;
1776 }
1777 if (ifa != NULL)
1778 ifa_ref(ifa);
1779 IF_ADDR_RUNLOCK(ifp);
1780 if (!ifa)
1781 return EADDRNOTAVAIL;
1782 ia = ifa2ia6(ifa);
1783
1784 if (cmd == SIOCGLIFADDR) {
1785 int error;
1786
1787 /* fill in the if_laddrreq structure */
1788 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1789 error = sa6_recoverscope(
1790 (struct sockaddr_in6 *)&iflr->addr);
1791 if (error != 0) {
1792 ifa_free(ifa);
1793 return (error);
1794 }
1795
1796 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1797 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1798 ia->ia_dstaddr.sin6_len);
1799 error = sa6_recoverscope(
1800 (struct sockaddr_in6 *)&iflr->dstaddr);
1801 if (error != 0) {
1802 ifa_free(ifa);
1803 return (error);
1804 }
1805 } else
1806 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1807
1808 iflr->prefixlen =
1809 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1810
1811 iflr->flags = ia->ia6_flags; /* XXX */
1812 ifa_free(ifa);
1813
1814 return 0;
1815 } else {
1816 struct in6_aliasreq ifra;
1817
1818 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1819 bzero(&ifra, sizeof(ifra));
1820 bcopy(iflr->iflr_name, ifra.ifra_name,
1821 sizeof(ifra.ifra_name));
1822
1823 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1824 ia->ia_addr.sin6_len);
1825 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1826 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1827 ia->ia_dstaddr.sin6_len);
1828 } else {
1829 bzero(&ifra.ifra_dstaddr,
1830 sizeof(ifra.ifra_dstaddr));
1831 }
1832 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1833 ia->ia_prefixmask.sin6_len);
1834
1835 ifra.ifra_flags = ia->ia6_flags;
1836 ifa_free(ifa);
1837 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1838 ifp, td);
1839 }
1840 }
1841 }
1842
1843 return EOPNOTSUPP; /* just for safety */
1844 }
1845
1846 /*
1847 * Initialize an interface's IPv6 address and routing table entry.
1848 */
1849 static int
1850 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1851 struct sockaddr_in6 *sin6, int newhost)
1852 {
1853 int error = 0, plen, ifacount = 0;
1854 int s = splimp();
1855 struct ifaddr *ifa;
1856
1857 /*
1858 * Give the interface a chance to initialize
1859 * if this is its first address,
1860 * and to validate the address if necessary.
1861 */
1862 IF_ADDR_RLOCK(ifp);
1863 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1864 if (ifa->ifa_addr->sa_family != AF_INET6)
1865 continue;
1866 ifacount++;
1867 }
1868 IF_ADDR_RUNLOCK(ifp);
1869
1870 ia->ia_addr = *sin6;
1871
1872 if (ifacount <= 1 && ifp->if_ioctl) {
1873 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1874 if (error) {
1875 splx(s);
1876 return (error);
1877 }
1878 }
1879 splx(s);
1880
1881 ia->ia_ifa.ifa_metric = ifp->if_metric;
1882
1883 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1884
1885 /*
1886 * Special case:
1887 * If a new destination address is specified for a point-to-point
1888 * interface, install a route to the destination as an interface
1889 * direct route.
1890 * XXX: the logic below rejects assigning multiple addresses on a p2p
1891 * interface that share the same destination.
1892 */
1893 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1894 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1895 ia->ia_dstaddr.sin6_family == AF_INET6) {
1896 int rtflags = RTF_UP | RTF_HOST;
1897 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1898 if (error)
1899 return (error);
1900 ia->ia_flags |= IFA_ROUTE;
1901 /*
1902 * Handle the case for ::1 .
1903 */
1904 if (ifp->if_flags & IFF_LOOPBACK)
1905 ia->ia_flags |= IFA_RTSELF;
1906 }
1907
1908 /*
1909 * add a loopback route to self
1910 */
1911 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1912 error = ifa_add_loopback_route((struct ifaddr *)ia,
1913 (struct sockaddr *)&ia->ia_addr);
1914 if (error == 0)
1915 ia->ia_flags |= IFA_RTSELF;
1916 }
1917
1918 /* Add local address to lltable, if necessary (ex. on p2p link). */
1919 if (newhost)
1920 in6_ifaddloop(&(ia->ia_ifa));
1921
1922 return (error);
1923 }
1924
1925 /*
1926 * Find an IPv6 interface link-local address specific to an interface.
1927 * ifaddr is returned referenced.
1928 */
1929 struct in6_ifaddr *
1930 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1931 {
1932 struct ifaddr *ifa;
1933
1934 IF_ADDR_RLOCK(ifp);
1935 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1936 if (ifa->ifa_addr->sa_family != AF_INET6)
1937 continue;
1938 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1939 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1940 ignoreflags) != 0)
1941 continue;
1942 ifa_ref(ifa);
1943 break;
1944 }
1945 }
1946 IF_ADDR_RUNLOCK(ifp);
1947
1948 return ((struct in6_ifaddr *)ifa);
1949 }
1950
1951
1952 /*
1953 * find the internet address corresponding to a given interface and address.
1954 * ifaddr is returned referenced.
1955 */
1956 struct in6_ifaddr *
1957 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1958 {
1959 struct ifaddr *ifa;
1960
1961 IF_ADDR_RLOCK(ifp);
1962 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1963 if (ifa->ifa_addr->sa_family != AF_INET6)
1964 continue;
1965 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1966 ifa_ref(ifa);
1967 break;
1968 }
1969 }
1970 IF_ADDR_RUNLOCK(ifp);
1971
1972 return ((struct in6_ifaddr *)ifa);
1973 }
1974
1975 /*
1976 * Find a link-local scoped address on ifp and return it if any.
1977 */
1978 struct in6_ifaddr *
1979 in6ifa_llaonifp(struct ifnet *ifp)
1980 {
1981 struct sockaddr_in6 *sin6;
1982 struct ifaddr *ifa;
1983
1984 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1985 return (NULL);
1986 if_addr_rlock(ifp);
1987 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1988 if (ifa->ifa_addr->sa_family != AF_INET6)
1989 continue;
1990 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1991 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1992 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1993 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1994 break;
1995 }
1996 if_addr_runlock(ifp);
1997
1998 return ((struct in6_ifaddr *)ifa);
1999 }
2000
2001 /*
2002 * Convert IP6 address to printable (loggable) representation. Caller
2003 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
2004 */
2005 static char digits[] = "0123456789abcdef";
2006 char *
2007 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
2008 {
2009 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
2010 char *cp;
2011 const u_int16_t *a = (const u_int16_t *)addr;
2012 const u_int8_t *d;
2013 int dcolon = 0, zero = 0;
2014
2015 cp = ip6buf;
2016
2017 for (i = 0; i < 8; i++) {
2018 if (*(a + i) == 0) {
2019 cnt++;
2020 if (cnt == 1)
2021 idx = i;
2022 }
2023 else if (maxcnt < cnt) {
2024 maxcnt = cnt;
2025 index = idx;
2026 cnt = 0;
2027 }
2028 }
2029 if (maxcnt < cnt) {
2030 maxcnt = cnt;
2031 index = idx;
2032 }
2033
2034 for (i = 0; i < 8; i++) {
2035 if (dcolon == 1) {
2036 if (*a == 0) {
2037 if (i == 7)
2038 *cp++ = ':';
2039 a++;
2040 continue;
2041 } else
2042 dcolon = 2;
2043 }
2044 if (*a == 0) {
2045 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2046 if (i == 0)
2047 *cp++ = ':';
2048 *cp++ = ':';
2049 dcolon = 1;
2050 } else {
2051 *cp++ = '';
2052 *cp++ = ':';
2053 }
2054 a++;
2055 continue;
2056 }
2057 d = (const u_char *)a;
2058 /* Try to eliminate leading zeros in printout like in :0001. */
2059 zero = 1;
2060 *cp = digits[*d >> 4];
2061 if (*cp != '') {
2062 zero = 0;
2063 cp++;
2064 }
2065 *cp = digits[*d++ & 0xf];
2066 if (zero == 0 || (*cp != '')) {
2067 zero = 0;
2068 cp++;
2069 }
2070 *cp = digits[*d >> 4];
2071 if (zero == 0 || (*cp != '')) {
2072 zero = 0;
2073 cp++;
2074 }
2075 *cp++ = digits[*d & 0xf];
2076 *cp++ = ':';
2077 a++;
2078 }
2079 *--cp = '\0';
2080 return (ip6buf);
2081 }
2082
2083 int
2084 in6_localaddr(struct in6_addr *in6)
2085 {
2086 struct in6_ifaddr *ia;
2087
2088 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2089 return 1;
2090
2091 IN6_IFADDR_RLOCK();
2092 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2093 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2094 &ia->ia_prefixmask.sin6_addr)) {
2095 IN6_IFADDR_RUNLOCK();
2096 return 1;
2097 }
2098 }
2099 IN6_IFADDR_RUNLOCK();
2100
2101 return (0);
2102 }
2103
2104 /*
2105 * Return 1 if an internet address is for the local host and configured
2106 * on one of its interfaces.
2107 */
2108 int
2109 in6_localip(struct in6_addr *in6)
2110 {
2111 struct in6_ifaddr *ia;
2112
2113 IN6_IFADDR_RLOCK();
2114 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2115 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2116 IN6_IFADDR_RUNLOCK();
2117 return (1);
2118 }
2119 }
2120 IN6_IFADDR_RUNLOCK();
2121 return (0);
2122 }
2123
2124
2125 int
2126 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2127 {
2128 struct in6_ifaddr *ia;
2129
2130 IN6_IFADDR_RLOCK();
2131 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2132 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2133 &sa6->sin6_addr) &&
2134 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2135 IN6_IFADDR_RUNLOCK();
2136 return (1); /* true */
2137 }
2138
2139 /* XXX: do we still have to go thru the rest of the list? */
2140 }
2141 IN6_IFADDR_RUNLOCK();
2142
2143 return (0); /* false */
2144 }
2145
2146 /*
2147 * return length of part which dst and src are equal
2148 * hard coding...
2149 */
2150 int
2151 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2152 {
2153 int match = 0;
2154 u_char *s = (u_char *)src, *d = (u_char *)dst;
2155 u_char *lim = s + 16, r;
2156
2157 while (s < lim)
2158 if ((r = (*d++ ^ *s++)) != 0) {
2159 while (r < 128) {
2160 match++;
2161 r <<= 1;
2162 }
2163 break;
2164 } else
2165 match += 8;
2166 return match;
2167 }
2168
2169 /* XXX: to be scope conscious */
2170 int
2171 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2172 {
2173 int bytelen, bitlen;
2174
2175 /* sanity check */
2176 if (0 > len || len > 128) {
2177 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2178 len);
2179 return (0);
2180 }
2181
2182 bytelen = len / 8;
2183 bitlen = len % 8;
2184
2185 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2186 return (0);
2187 if (bitlen != 0 &&
2188 p1->s6_addr[bytelen] >> (8 - bitlen) !=
2189 p2->s6_addr[bytelen] >> (8 - bitlen))
2190 return (0);
2191
2192 return (1);
2193 }
2194
2195 void
2196 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2197 {
2198 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2199 int bytelen, bitlen, i;
2200
2201 /* sanity check */
2202 if (0 > len || len > 128) {
2203 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2204 len);
2205 return;
2206 }
2207
2208 bzero(maskp, sizeof(*maskp));
2209 bytelen = len / 8;
2210 bitlen = len % 8;
2211 for (i = 0; i < bytelen; i++)
2212 maskp->s6_addr[i] = 0xff;
2213 if (bitlen)
2214 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2215 }
2216
2217 /*
2218 * return the best address out of the same scope. if no address was
2219 * found, return the first valid address from designated IF.
2220 */
2221 struct in6_ifaddr *
2222 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2223 {
2224 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2225 struct ifaddr *ifa;
2226 struct in6_ifaddr *besta = 0;
2227 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2228
2229 dep[0] = dep[1] = NULL;
2230
2231 /*
2232 * We first look for addresses in the same scope.
2233 * If there is one, return it.
2234 * If two or more, return one which matches the dst longest.
2235 * If none, return one of global addresses assigned other ifs.
2236 */
2237 IF_ADDR_RLOCK(ifp);
2238 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2239 if (ifa->ifa_addr->sa_family != AF_INET6)
2240 continue;
2241 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2242 continue; /* XXX: is there any case to allow anycast? */
2243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2244 continue; /* don't use this interface */
2245 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2246 continue;
2247 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2248 if (V_ip6_use_deprecated)
2249 dep[0] = (struct in6_ifaddr *)ifa;
2250 continue;
2251 }
2252
2253 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2254 /*
2255 * call in6_matchlen() as few as possible
2256 */
2257 if (besta) {
2258 if (blen == -1)
2259 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2260 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2261 if (tlen > blen) {
2262 blen = tlen;
2263 besta = (struct in6_ifaddr *)ifa;
2264 }
2265 } else
2266 besta = (struct in6_ifaddr *)ifa;
2267 }
2268 }
2269 if (besta) {
2270 ifa_ref(&besta->ia_ifa);
2271 IF_ADDR_RUNLOCK(ifp);
2272 return (besta);
2273 }
2274
2275 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2276 if (ifa->ifa_addr->sa_family != AF_INET6)
2277 continue;
2278 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2279 continue; /* XXX: is there any case to allow anycast? */
2280 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2281 continue; /* don't use this interface */
2282 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2283 continue;
2284 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2285 if (V_ip6_use_deprecated)
2286 dep[1] = (struct in6_ifaddr *)ifa;
2287 continue;
2288 }
2289
2290 if (ifa != NULL)
2291 ifa_ref(ifa);
2292 IF_ADDR_RUNLOCK(ifp);
2293 return (struct in6_ifaddr *)ifa;
2294 }
2295
2296 /* use the last-resort values, that are, deprecated addresses */
2297 if (dep[0]) {
2298 ifa_ref((struct ifaddr *)dep[0]);
2299 IF_ADDR_RUNLOCK(ifp);
2300 return dep[0];
2301 }
2302 if (dep[1]) {
2303 ifa_ref((struct ifaddr *)dep[1]);
2304 IF_ADDR_RUNLOCK(ifp);
2305 return dep[1];
2306 }
2307
2308 IF_ADDR_RUNLOCK(ifp);
2309 return NULL;
2310 }
2311
2312 /*
2313 * perform DAD when interface becomes IFF_UP.
2314 */
2315 void
2316 in6_if_up(struct ifnet *ifp)
2317 {
2318 struct ifaddr *ifa;
2319 struct in6_ifaddr *ia;
2320
2321 IF_ADDR_RLOCK(ifp);
2322 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2323 if (ifa->ifa_addr->sa_family != AF_INET6)
2324 continue;
2325 ia = (struct in6_ifaddr *)ifa;
2326 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2327 /*
2328 * The TENTATIVE flag was likely set by hand
2329 * beforehand, implicitly indicating the need for DAD.
2330 * We may be able to skip the random delay in this
2331 * case, but we impose delays just in case.
2332 */
2333 nd6_dad_start(ifa,
2334 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2335 }
2336 }
2337 IF_ADDR_RUNLOCK(ifp);
2338
2339 /*
2340 * special cases, like 6to4, are handled in in6_ifattach
2341 */
2342 in6_ifattach(ifp, NULL);
2343 }
2344
2345 int
2346 in6if_do_dad(struct ifnet *ifp)
2347 {
2348 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2349 return (0);
2350
2351 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2352 return (0);
2353
2354 switch (ifp->if_type) {
2355 #ifdef IFT_DUMMY
2356 case IFT_DUMMY:
2357 #endif
2358 case IFT_FAITH:
2359 /*
2360 * These interfaces do not have the IFF_LOOPBACK flag,
2361 * but loop packets back. We do not have to do DAD on such
2362 * interfaces. We should even omit it, because loop-backed
2363 * NS would confuse the DAD procedure.
2364 */
2365 return (0);
2366 default:
2367 /*
2368 * Our DAD routine requires the interface up and running.
2369 * However, some interfaces can be up before the RUNNING
2370 * status. Additionaly, users may try to assign addresses
2371 * before the interface becomes up (or running).
2372 * We simply skip DAD in such a case as a work around.
2373 * XXX: we should rather mark "tentative" on such addresses,
2374 * and do DAD after the interface becomes ready.
2375 */
2376 if (!((ifp->if_flags & IFF_UP) &&
2377 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2378 return (0);
2379
2380 return (1);
2381 }
2382 }
2383
2384 /*
2385 * Calculate max IPv6 MTU through all the interfaces and store it
2386 * to in6_maxmtu.
2387 */
2388 void
2389 in6_setmaxmtu(void)
2390 {
2391 unsigned long maxmtu = 0;
2392 struct ifnet *ifp;
2393
2394 IFNET_RLOCK_NOSLEEP();
2395 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2396 /* this function can be called during ifnet initialization */
2397 if (!ifp->if_afdata[AF_INET6])
2398 continue;
2399 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2400 IN6_LINKMTU(ifp) > maxmtu)
2401 maxmtu = IN6_LINKMTU(ifp);
2402 }
2403 IFNET_RUNLOCK_NOSLEEP();
2404 if (maxmtu) /* update only when maxmtu is positive */
2405 V_in6_maxmtu = maxmtu;
2406 }
2407
2408 /*
2409 * Provide the length of interface identifiers to be used for the link attached
2410 * to the given interface. The length should be defined in "IPv6 over
2411 * xxx-link" document. Note that address architecture might also define
2412 * the length for a particular set of address prefixes, regardless of the
2413 * link type. As clarified in rfc2462bis, those two definitions should be
2414 * consistent, and those really are as of August 2004.
2415 */
2416 int
2417 in6_if2idlen(struct ifnet *ifp)
2418 {
2419 switch (ifp->if_type) {
2420 case IFT_ETHER: /* RFC2464 */
2421 #ifdef IFT_PROPVIRTUAL
2422 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2423 #endif
2424 #ifdef IFT_L2VLAN
2425 case IFT_L2VLAN: /* ditto */
2426 #endif
2427 #ifdef IFT_IEEE80211
2428 case IFT_IEEE80211: /* ditto */
2429 #endif
2430 #ifdef IFT_MIP
2431 case IFT_MIP: /* ditto */
2432 #endif
2433 case IFT_INFINIBAND:
2434 return (64);
2435 case IFT_FDDI: /* RFC2467 */
2436 return (64);
2437 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
2438 return (64);
2439 case IFT_PPP: /* RFC2472 */
2440 return (64);
2441 case IFT_ARCNET: /* RFC2497 */
2442 return (64);
2443 case IFT_FRELAY: /* RFC2590 */
2444 return (64);
2445 case IFT_IEEE1394: /* RFC3146 */
2446 return (64);
2447 case IFT_GIF:
2448 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2449 case IFT_LOOP:
2450 return (64); /* XXX: is this really correct? */
2451 default:
2452 /*
2453 * Unknown link type:
2454 * It might be controversial to use the today's common constant
2455 * of 64 for these cases unconditionally. For full compliance,
2456 * we should return an error in this case. On the other hand,
2457 * if we simply miss the standard for the link type or a new
2458 * standard is defined for a new link type, the IFID length
2459 * is very likely to be the common constant. As a compromise,
2460 * we always use the constant, but make an explicit notice
2461 * indicating the "unknown" case.
2462 */
2463 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2464 return (64);
2465 }
2466 }
2467
2468 #include <sys/sysctl.h>
2469
2470 struct in6_llentry {
2471 struct llentry base;
2472 struct sockaddr_in6 l3_addr6;
2473 };
2474
2475 /*
2476 * Deletes an address from the address table.
2477 * This function is called by the timer functions
2478 * such as arptimer() and nd6_llinfo_timer(), and
2479 * the caller does the locking.
2480 */
2481 static void
2482 in6_lltable_free(struct lltable *llt, struct llentry *lle)
2483 {
2484 LLE_WUNLOCK(lle);
2485 LLE_LOCK_DESTROY(lle);
2486 free(lle, M_LLTABLE);
2487 }
2488
2489 static struct llentry *
2490 in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2491 {
2492 struct in6_llentry *lle;
2493
2494 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2495 if (lle == NULL) /* NB: caller generates msg */
2496 return NULL;
2497
2498 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2499 lle->base.lle_refcnt = 1;
2500 lle->base.lle_free = in6_lltable_free;
2501 LLE_LOCK_INIT(&lle->base);
2502 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2503 CALLOUT_RETURNUNLOCKED);
2504
2505 return (&lle->base);
2506 }
2507
2508 static void
2509 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2510 const struct sockaddr *mask, u_int flags)
2511 {
2512 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2513 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2514 struct llentry *lle, *next;
2515 int i;
2516
2517 /*
2518 * (flags & LLE_STATIC) means deleting all entries
2519 * including static ND6 entries.
2520 */
2521 IF_AFDATA_WLOCK(llt->llt_ifp);
2522 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2523 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2524 if (IN6_ARE_MASKED_ADDR_EQUAL(
2525 &satosin6(L3_ADDR(lle))->sin6_addr,
2526 &pfx->sin6_addr, &msk->sin6_addr) &&
2527 ((flags & LLE_STATIC) ||
2528 !(lle->la_flags & LLE_STATIC))) {
2529 LLE_WLOCK(lle);
2530 if (callout_stop(&lle->la_timer))
2531 LLE_REMREF(lle);
2532 llentry_free(lle);
2533 }
2534 }
2535 }
2536 IF_AFDATA_WUNLOCK(llt->llt_ifp);
2537 }
2538
2539 static int
2540 in6_lltable_rtcheck(struct ifnet *ifp,
2541 u_int flags,
2542 const struct sockaddr *l3addr)
2543 {
2544 struct rtentry *rt;
2545 char ip6buf[INET6_ADDRSTRLEN];
2546
2547 KASSERT(l3addr->sa_family == AF_INET6,
2548 ("sin_family %d", l3addr->sa_family));
2549
2550 /* Our local addresses are always only installed on the default FIB. */
2551 /* XXX rtalloc1 should take a const param */
2552 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2553 RT_DEFAULT_FIB);
2554 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2555 struct ifaddr *ifa;
2556 /*
2557 * Create an ND6 cache for an IPv6 neighbor
2558 * that is not covered by our own prefix.
2559 */
2560 /* XXX ifaof_ifpforaddr should take a const param */
2561 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2562 if (ifa != NULL) {
2563 ifa_free(ifa);
2564 if (rt != NULL)
2565 RTFREE_LOCKED(rt);
2566 return 0;
2567 }
2568 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2569 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2570 if (rt != NULL)
2571 RTFREE_LOCKED(rt);
2572 return EINVAL;
2573 }
2574 RTFREE_LOCKED(rt);
2575 return 0;
2576 }
2577
2578 static struct llentry *
2579 in6_lltable_lookup(struct lltable *llt, u_int flags,
2580 const struct sockaddr *l3addr)
2581 {
2582 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2583 struct ifnet *ifp = llt->llt_ifp;
2584 struct llentry *lle;
2585 struct llentries *lleh;
2586 u_int hashkey;
2587
2588 IF_AFDATA_LOCK_ASSERT(ifp);
2589 KASSERT(l3addr->sa_family == AF_INET6,
2590 ("sin_family %d", l3addr->sa_family));
2591
2592 hashkey = sin6->sin6_addr.s6_addr32[3];
2593 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2594 LIST_FOREACH(lle, lleh, lle_next) {
2595 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2596 if (lle->la_flags & LLE_DELETED)
2597 continue;
2598 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2599 sizeof(struct in6_addr)) == 0)
2600 break;
2601 }
2602
2603 if (lle == NULL) {
2604 if (!(flags & LLE_CREATE))
2605 return (NULL);
2606 /*
2607 * A route that covers the given address must have
2608 * been installed 1st because we are doing a resolution,
2609 * verify this.
2610 */
2611 if (!(flags & LLE_IFADDR) &&
2612 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2613 return NULL;
2614
2615 lle = in6_lltable_new(l3addr, flags);
2616 if (lle == NULL) {
2617 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2618 return NULL;
2619 }
2620 lle->la_flags = flags & ~LLE_CREATE;
2621 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2622 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2623 lle->la_flags |= (LLE_VALID | LLE_STATIC);
2624 }
2625
2626 lle->lle_tbl = llt;
2627 lle->lle_head = lleh;
2628 lle->la_flags |= LLE_LINKED;
2629 LIST_INSERT_HEAD(lleh, lle, lle_next);
2630 } else if (flags & LLE_DELETE) {
2631 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2632 LLE_WLOCK(lle);
2633 lle->la_flags |= LLE_DELETED;
2634 #ifdef DIAGNOSTIC
2635 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2636 #endif
2637 if ((lle->la_flags &
2638 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2639 llentry_free(lle);
2640 else
2641 LLE_WUNLOCK(lle);
2642 }
2643 lle = (void *)-1;
2644 }
2645 if (LLE_IS_VALID(lle)) {
2646 if (flags & LLE_EXCLUSIVE)
2647 LLE_WLOCK(lle);
2648 else
2649 LLE_RLOCK(lle);
2650 }
2651 return (lle);
2652 }
2653
2654 static int
2655 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2656 {
2657 struct ifnet *ifp = llt->llt_ifp;
2658 struct llentry *lle;
2659 /* XXX stack use */
2660 struct {
2661 struct rt_msghdr rtm;
2662 struct sockaddr_in6 sin6;
2663 /*
2664 * ndp.c assumes that sdl is word aligned
2665 */
2666 #ifdef __LP64__
2667 uint32_t pad;
2668 #endif
2669 struct sockaddr_dl sdl;
2670 } ndpc;
2671 int i, error;
2672
2673 if (ifp->if_flags & IFF_LOOPBACK)
2674 return 0;
2675
2676 LLTABLE_LOCK_ASSERT();
2677
2678 error = 0;
2679 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2680 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2681 struct sockaddr_dl *sdl;
2682
2683 /* skip deleted or invalid entries */
2684 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2685 continue;
2686 /* Skip if jailed and not a valid IP of the prison. */
2687 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2688 continue;
2689 /*
2690 * produce a msg made of:
2691 * struct rt_msghdr;
2692 * struct sockaddr_in6 (IPv6)
2693 * struct sockaddr_dl;
2694 */
2695 bzero(&ndpc, sizeof(ndpc));
2696 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2697 ndpc.rtm.rtm_version = RTM_VERSION;
2698 ndpc.rtm.rtm_type = RTM_GET;
2699 ndpc.rtm.rtm_flags = RTF_UP;
2700 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2701 ndpc.sin6.sin6_family = AF_INET6;
2702 ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2703 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2704
2705 /* publish */
2706 if (lle->la_flags & LLE_PUB)
2707 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2708
2709 sdl = &ndpc.sdl;
2710 sdl->sdl_family = AF_LINK;
2711 sdl->sdl_len = sizeof(*sdl);
2712 sdl->sdl_alen = ifp->if_addrlen;
2713 sdl->sdl_index = ifp->if_index;
2714 sdl->sdl_type = ifp->if_type;
2715 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2716 ndpc.rtm.rtm_rmx.rmx_expire =
2717 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2718 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2719 if (lle->la_flags & LLE_STATIC)
2720 ndpc.rtm.rtm_flags |= RTF_STATIC;
2721 ndpc.rtm.rtm_index = ifp->if_index;
2722 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2723 if (error)
2724 break;
2725 }
2726 }
2727 return error;
2728 }
2729
2730 void *
2731 in6_domifattach(struct ifnet *ifp)
2732 {
2733 struct in6_ifextra *ext;
2734
2735 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2736 bzero(ext, sizeof(*ext));
2737
2738 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2739 M_IFADDR, M_WAITOK);
2740 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2741
2742 ext->icmp6_ifstat =
2743 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2744 M_IFADDR, M_WAITOK);
2745 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2746
2747 ext->nd_ifinfo = nd6_ifattach(ifp);
2748 ext->scope6_id = scope6_ifattach(ifp);
2749 ext->lltable = lltable_init(ifp, AF_INET6);
2750 if (ext->lltable != NULL) {
2751 ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2752 ext->lltable->llt_lookup = in6_lltable_lookup;
2753 ext->lltable->llt_dump = in6_lltable_dump;
2754 }
2755
2756 ext->mld_ifinfo = mld_domifattach(ifp);
2757
2758 return ext;
2759 }
2760
2761 void
2762 in6_domifdetach(struct ifnet *ifp, void *aux)
2763 {
2764 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2765
2766 mld_domifdetach(ifp);
2767 scope6_ifdetach(ext->scope6_id);
2768 nd6_ifdetach(ext->nd_ifinfo);
2769 lltable_free(ext->lltable);
2770 free(ext->in6_ifstat, M_IFADDR);
2771 free(ext->icmp6_ifstat, M_IFADDR);
2772 free(ext, M_IFADDR);
2773 }
2774
2775 /*
2776 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2777 * v4 mapped addr or v4 compat addr
2778 */
2779 void
2780 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2781 {
2782
2783 bzero(sin, sizeof(*sin));
2784 sin->sin_len = sizeof(struct sockaddr_in);
2785 sin->sin_family = AF_INET;
2786 sin->sin_port = sin6->sin6_port;
2787 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2788 }
2789
2790 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2791 void
2792 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2793 {
2794 bzero(sin6, sizeof(*sin6));
2795 sin6->sin6_len = sizeof(struct sockaddr_in6);
2796 sin6->sin6_family = AF_INET6;
2797 sin6->sin6_port = sin->sin_port;
2798 sin6->sin6_addr.s6_addr32[0] = 0;
2799 sin6->sin6_addr.s6_addr32[1] = 0;
2800 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2801 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2802 }
2803
2804 /* Convert sockaddr_in6 into sockaddr_in. */
2805 void
2806 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2807 {
2808 struct sockaddr_in *sin_p;
2809 struct sockaddr_in6 sin6;
2810
2811 /*
2812 * Save original sockaddr_in6 addr and convert it
2813 * to sockaddr_in.
2814 */
2815 sin6 = *(struct sockaddr_in6 *)nam;
2816 sin_p = (struct sockaddr_in *)nam;
2817 in6_sin6_2_sin(sin_p, &sin6);
2818 }
2819
2820 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2821 void
2822 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2823 {
2824 struct sockaddr_in *sin_p;
2825 struct sockaddr_in6 *sin6_p;
2826
2827 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2828 sin_p = (struct sockaddr_in *)*nam;
2829 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2830 free(*nam, M_SONAME);
2831 *nam = (struct sockaddr *)sin6_p;
2832 }
Cache object: 478e92a0766e9491ab9ab118d9e10ca9
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