1 /* $NetBSD: in6.c,v 1.292 2024/03/01 23:50:27 riastradh Exp $ */
2 /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1982, 1986, 1991, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)in.c 8.2 (Berkeley) 11/15/93
62 */
63
64 #include <sys/cdefs.h>
65 __KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.292 2024/03/01 23:50:27 riastradh Exp $");
66
67 #ifdef _KERNEL_OPT
68 #include "opt_inet.h"
69 #include "opt_compat_netbsd.h"
70 #include "opt_net_mpsafe.h"
71 #endif
72
73 #include <sys/param.h>
74 #include <sys/ioctl.h>
75 #include <sys/errno.h>
76 #include <sys/malloc.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sockio.h>
80 #include <sys/systm.h>
81 #include <sys/proc.h>
82 #include <sys/time.h>
83 #include <sys/kernel.h>
84 #include <sys/syslog.h>
85 #include <sys/kauth.h>
86 #include <sys/cprng.h>
87 #include <sys/kmem.h>
88
89 #include <net/if.h>
90 #include <net/if_types.h>
91 #include <net/if_llatbl.h>
92 #include <net/if_ether.h>
93 #include <net/if_dl.h>
94 #include <net/pfil.h>
95 #include <net/route.h>
96
97 #include <netinet/in.h>
98 #include <netinet/in_var.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
108 #include <compat/netinet6/in6_var.h>
109 #include <compat/netinet6/nd6.h>
110
111 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options");
112
113 /* enable backward compatibility code for obsoleted ioctls */
114 #define COMPAT_IN6IFIOCTL
115
116 #ifdef IN6_DEBUG
117 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__)
118 #else
119 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0)
120 #endif /* IN6_DEBUG */
121
122 /*
123 * Definitions of some constant IP6 addresses.
124 */
125 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
126 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
127 const struct in6_addr in6addr_nodelocal_allnodes =
128 IN6ADDR_NODELOCAL_ALLNODES_INIT;
129 const struct in6_addr in6addr_linklocal_allnodes =
130 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
131 const struct in6_addr in6addr_linklocal_allrouters =
132 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
133
134 const struct in6_addr in6mask0 = IN6MASK0;
135 const struct in6_addr in6mask32 = IN6MASK32;
136 const struct in6_addr in6mask64 = IN6MASK64;
137 const struct in6_addr in6mask96 = IN6MASK96;
138 const struct in6_addr in6mask128 = IN6MASK128;
139
140 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
141 0, 0, IN6ADDR_ANY_INIT, 0};
142
143 struct pslist_head in6_ifaddr_list;
144 kmutex_t in6_ifaddr_lock;
145
146 static int in6_lifaddr_ioctl(struct socket *, u_long, void *,
147 struct ifnet *);
148 static int in6_ifaddprefix(struct in6_ifaddr *);
149 static int in6_ifremprefix(struct in6_ifaddr *);
150 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
151 const struct sockaddr_in6 *, int);
152 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
153 static int in6_update_ifa1(struct ifnet *, struct in6_aliasreq *,
154 struct in6_ifaddr **, struct psref *, int);
155
156 void
in6_init(void)157 in6_init(void)
158 {
159
160 PSLIST_INIT(&in6_ifaddr_list);
161 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE);
162
163 in6_sysctl_multicast_setup(NULL);
164 }
165
166 /*
167 * Add ownaddr as loopback rtentry. We previously add the route only if
168 * necessary (ex. on a p2p link). However, since we now manage addresses
169 * separately from prefixes, we should always add the route. We can't
170 * rely on the cloning mechanism from the corresponding interface route
171 * any more.
172 */
173 void
in6_ifaddlocal(struct ifaddr * ifa)174 in6_ifaddlocal(struct ifaddr *ifa)
175 {
176
177 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) ||
178 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT &&
179 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa))))
180 {
181 rt_addrmsg(RTM_NEWADDR, ifa);
182 return;
183 }
184
185 rt_ifa_addlocal(ifa);
186 }
187
188 /*
189 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(),
190 * if it exists.
191 */
192 void
in6_ifremlocal(struct ifaddr * ifa)193 in6_ifremlocal(struct ifaddr *ifa)
194 {
195 struct in6_ifaddr *ia;
196 struct ifaddr *alt_ifa = NULL;
197 int ia_count = 0;
198 struct psref psref;
199 int s;
200
201 /*
202 * Some of BSD variants do not remove cloned routes
203 * from an interface direct route, when removing the direct route
204 * (see comments in net/net_osdep.h). Even for variants that do remove
205 * cloned routes, they could fail to remove the cloned routes when
206 * we handle multiple addresses that share a common prefix.
207 * So, we should remove the route corresponding to the deleted address.
208 */
209
210 /*
211 * Delete the entry only if exactly one ifaddr matches the
212 * address, ifa->ifa_addr.
213 *
214 * If more than one ifaddr matches, replace the ifaddr in
215 * the routing table, rt_ifa, with a different ifaddr than
216 * the one we are purging, ifa. It is important to do
217 * this, or else the routing table can accumulate dangling
218 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces,
219 * which will lead to crashes, later. (More than one ifaddr
220 * can match if we assign the same address to multiple---probably
221 * p2p---interfaces.)
222 *
223 * XXX An old comment at this place said, "we should avoid
224 * XXX such a configuration [i.e., interfaces with the same
225 * XXX addressed assigned --ed.] in IPv6...". I do not
226 * XXX agree, especially now that I have fixed the dangling
227 * XXX ifp-pointers bug.
228 */
229 s = pserialize_read_enter();
230 IN6_ADDRLIST_READER_FOREACH(ia) {
231 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr))
232 continue;
233 if (ia->ia_ifp != ifa->ifa_ifp)
234 alt_ifa = &ia->ia_ifa;
235 if (++ia_count > 1 && alt_ifa != NULL)
236 break;
237 }
238 if (ia_count > 1 && alt_ifa != NULL)
239 ifa_acquire(alt_ifa, &psref);
240 pserialize_read_exit(s);
241
242 if (ia_count == 0)
243 return;
244
245 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa);
246
247 if (ia_count > 1 && alt_ifa != NULL)
248 ifa_release(alt_ifa, &psref);
249 }
250
251 /* Add prefix route for the network. */
252 static int
in6_ifaddprefix(struct in6_ifaddr * ia)253 in6_ifaddprefix(struct in6_ifaddr *ia)
254 {
255 int error, flags = 0;
256
257 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) {
258 if (ia->ia_dstaddr.sin6_family != AF_INET6)
259 /* We don't need to install a host route. */
260 return 0;
261 flags |= RTF_HOST;
262 }
263
264 /* Is this a connected route for neighbour discovery? */
265 if (nd6_need_cache(ia->ia_ifp))
266 flags |= RTF_CONNECTED;
267
268 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0)
269 ia->ia_flags |= IFA_ROUTE;
270 else if (error == EEXIST)
271 /* Existence of the route is not an error. */
272 error = 0;
273
274 return error;
275 }
276
277 static int
in6_rt_ifa_matcher(struct rtentry * rt,void * v)278 in6_rt_ifa_matcher(struct rtentry *rt, void *v)
279 {
280 struct ifaddr *ifa = v;
281
282 if (rt->rt_ifa == ifa)
283 return 1;
284 else
285 return 0;
286 }
287
288 /* Delete network prefix route if present.
289 * Re-add it to another address if the prefix matches. */
290 static int
in6_ifremprefix(struct in6_ifaddr * target)291 in6_ifremprefix(struct in6_ifaddr *target)
292 {
293 int error, s;
294 struct in6_ifaddr *ia;
295
296 if ((target->ia_flags & IFA_ROUTE) == 0)
297 return 0;
298
299 s = pserialize_read_enter();
300 IN6_ADDRLIST_READER_FOREACH(ia) {
301 if (target->ia_dstaddr.sin6_len) {
302 if (ia->ia_dstaddr.sin6_len == 0 ||
303 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr,
304 &target->ia_dstaddr.sin6_addr))
305 continue;
306 } else {
307 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
308 &target->ia_addr.sin6_addr,
309 &target->ia_prefixmask.sin6_addr))
310 continue;
311 }
312
313 /*
314 * if we got a matching prefix route, move IFA_ROUTE to him
315 */
316 if ((ia->ia_flags & IFA_ROUTE) == 0) {
317 struct psref psref;
318 int bound = curlwp_bind();
319
320 ia6_acquire(ia, &psref);
321 pserialize_read_exit(s);
322
323 rtinit(&target->ia_ifa, RTM_DELETE, 0);
324 target->ia_flags &= ~IFA_ROUTE;
325
326 error = in6_ifaddprefix(ia);
327
328 if (!ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING))
329 goto skip;
330 /*
331 * Replace rt_ifa of routes that have the removing address
332 * with the new address.
333 */
334 rt_replace_ifa_matched_entries(AF_INET6,
335 in6_rt_ifa_matcher, &target->ia_ifa, &ia->ia_ifa);
336
337 skip:
338 ia6_release(ia, &psref);
339 curlwp_bindx(bound);
340
341 return error;
342 }
343 }
344 pserialize_read_exit(s);
345
346 /*
347 * noone seem to have prefix route. remove it.
348 */
349 rtinit(&target->ia_ifa, RTM_DELETE, 0);
350 target->ia_flags &= ~IFA_ROUTE;
351
352 if (ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING)) {
353 /* Remove routes that have the removing address as rt_ifa. */
354 rt_delete_matched_entries(AF_INET6, in6_rt_ifa_matcher,
355 &target->ia_ifa, true);
356 }
357
358 return 0;
359 }
360
361 int
in6_mask2len(struct in6_addr * mask,u_char * lim0)362 in6_mask2len(struct in6_addr *mask, u_char *lim0)
363 {
364 int x = 0, y;
365 u_char *lim = lim0, *p;
366
367 /* ignore the scope_id part */
368 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
369 lim = (u_char *)mask + sizeof(*mask);
370 for (p = (u_char *)mask; p < lim; x++, p++) {
371 if (*p != 0xff)
372 break;
373 }
374 y = 0;
375 if (p < lim) {
376 for (y = 0; y < NBBY; y++) {
377 if ((*p & (0x80 >> y)) == 0)
378 break;
379 }
380 }
381
382 /*
383 * when the limit pointer is given, do a stricter check on the
384 * remaining bits.
385 */
386 if (p < lim) {
387 if (y != 0 && (*p & (0x00ff >> y)) != 0)
388 return -1;
389 for (p = p + 1; p < lim; p++)
390 if (*p != 0)
391 return -1;
392 }
393
394 return x * NBBY + y;
395 }
396
397 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
398 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
399
400 static int
in6_control1(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)401 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
402 {
403 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
404 struct in6_ifaddr *ia = NULL;
405 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
406 struct sockaddr_in6 *sa6;
407 int error, bound;
408 struct psref psref;
409
410 switch (cmd) {
411 case SIOCAADDRCTL_POLICY:
412 case SIOCDADDRCTL_POLICY:
413 /* Privileged. */
414 return in6_src_ioctl(cmd, data);
415 /*
416 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc.
417 */
418 case SIOCSIFADDR:
419 case SIOCSIFDSTADDR:
420 case SIOCSIFBRDADDR:
421 case SIOCSIFNETMASK:
422 return EOPNOTSUPP;
423 case SIOCGETSGCNT_IN6:
424 case SIOCGETMIFCNT_IN6:
425 return mrt6_ioctl(cmd, data);
426 case SIOCGIFADDRPREF:
427 case SIOCSIFADDRPREF:
428 if (ifp == NULL)
429 return EINVAL;
430 return ifaddrpref_ioctl(so, cmd, data, ifp);
431 }
432
433 if (ifp == NULL)
434 return EOPNOTSUPP;
435
436 switch (cmd) {
437 #ifdef OSIOCSIFINFO_IN6_90
438 case OSIOCSIFINFO_FLAGS_90:
439 case OSIOCSIFINFO_IN6_90:
440 case OSIOCSDEFIFACE_IN6:
441 case OSIOCSNDFLUSH_IN6:
442 case OSIOCSPFXFLUSH_IN6:
443 case OSIOCSRTRFLUSH_IN6:
444 #endif
445 case SIOCSIFINFO_FLAGS:
446 case SIOCSIFINFO_IN6:
447 /* Privileged. */
448 /* FALLTHROUGH */
449 #ifdef OSIOCGIFINFO_IN6
450 case OSIOCGIFINFO_IN6:
451 #endif
452 #ifdef OSIOCGIFINFO_IN6_90
453 case OSIOCGDRLST_IN6:
454 case OSIOCGPRLST_IN6:
455 case OSIOCGIFINFO_IN6_90:
456 case OSIOCGDEFIFACE_IN6:
457 #endif
458 case SIOCGIFINFO_IN6:
459 case SIOCGNBRINFO_IN6:
460 return nd6_ioctl(cmd, data, ifp);
461 }
462
463 switch (cmd) {
464 case SIOCALIFADDR:
465 case SIOCDLIFADDR:
466 /* Privileged. */
467 /* FALLTHROUGH */
468 case SIOCGLIFADDR:
469 return in6_lifaddr_ioctl(so, cmd, data, ifp);
470 }
471
472 /*
473 * Find address for this interface, if it exists.
474 *
475 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
476 * only, and used the first interface address as the target of other
477 * operations (without checking ifra_addr). This was because netinet
478 * code/API assumed at most 1 interface address per interface.
479 * Since IPv6 allows a node to assign multiple addresses
480 * on a single interface, we almost always look and check the
481 * presence of ifra_addr, and reject invalid ones here.
482 * It also decreases duplicated code among SIOC*_IN6 operations.
483 */
484 switch (cmd) {
485 case SIOCAIFADDR_IN6:
486 #ifdef OSIOCAIFADDR_IN6
487 case OSIOCAIFADDR_IN6:
488 #endif
489 #ifdef OSIOCSIFPHYADDR_IN6
490 case OSIOCSIFPHYADDR_IN6:
491 #endif
492 case SIOCSIFPHYADDR_IN6:
493 sa6 = &ifra->ifra_addr;
494 break;
495 case SIOCSIFADDR_IN6:
496 case SIOCGIFADDR_IN6:
497 case SIOCSIFDSTADDR_IN6:
498 case SIOCSIFNETMASK_IN6:
499 case SIOCGIFDSTADDR_IN6:
500 case SIOCGIFNETMASK_IN6:
501 case SIOCDIFADDR_IN6:
502 case SIOCGIFPSRCADDR_IN6:
503 case SIOCGIFPDSTADDR_IN6:
504 case SIOCGIFAFLAG_IN6:
505 case SIOCGIFALIFETIME_IN6:
506 #ifdef OSIOCGIFALIFETIME_IN6
507 case OSIOCGIFALIFETIME_IN6:
508 #endif
509 case SIOCGIFSTAT_IN6:
510 case SIOCGIFSTAT_ICMP6:
511 sa6 = &ifr->ifr_addr;
512 break;
513 default:
514 sa6 = NULL;
515 break;
516 }
517
518 error = 0;
519 bound = curlwp_bind();
520 if (sa6 && sa6->sin6_family == AF_INET6) {
521 if (sa6->sin6_scope_id != 0)
522 error = sa6_embedscope(sa6, 0);
523 else
524 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
525 if (error != 0)
526 goto out;
527 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref);
528 } else
529 ia = NULL;
530
531 switch (cmd) {
532 case SIOCSIFADDR_IN6:
533 case SIOCSIFDSTADDR_IN6:
534 case SIOCSIFNETMASK_IN6:
535 /*
536 * Since IPv6 allows a node to assign multiple addresses
537 * on a single interface, SIOCSIFxxx ioctls are deprecated.
538 */
539 error = EINVAL;
540 goto release;
541
542 case SIOCDIFADDR_IN6:
543 /*
544 * for IPv4, we look for existing in_ifaddr here to allow
545 * "ifconfig if0 delete" to remove the first IPv4 address on
546 * the interface. For IPv6, as the spec allows multiple
547 * interface address from the day one, we consider "remove the
548 * first one" semantics to be not preferable.
549 */
550 if (ia == NULL) {
551 error = EADDRNOTAVAIL;
552 goto out;
553 }
554 #ifdef OSIOCAIFADDR_IN6
555 /* FALLTHROUGH */
556 case OSIOCAIFADDR_IN6:
557 #endif
558 /* FALLTHROUGH */
559 case SIOCAIFADDR_IN6:
560 /*
561 * We always require users to specify a valid IPv6 address for
562 * the corresponding operation.
563 */
564 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
565 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
566 error = EAFNOSUPPORT;
567 goto release;
568 }
569 /* Privileged. */
570
571 break;
572
573 case SIOCGIFADDR_IN6:
574 /* This interface is basically deprecated. use SIOCGIFCONF. */
575 /* FALLTHROUGH */
576 case SIOCGIFAFLAG_IN6:
577 case SIOCGIFNETMASK_IN6:
578 case SIOCGIFDSTADDR_IN6:
579 case SIOCGIFALIFETIME_IN6:
580 #ifdef OSIOCGIFALIFETIME_IN6
581 case OSIOCGIFALIFETIME_IN6:
582 #endif
583 /* must think again about its semantics */
584 if (ia == NULL) {
585 error = EADDRNOTAVAIL;
586 goto out;
587 }
588 break;
589 }
590
591 switch (cmd) {
592
593 case SIOCGIFADDR_IN6:
594 ifr->ifr_addr = ia->ia_addr;
595 error = sa6_recoverscope(&ifr->ifr_addr);
596 break;
597
598 case SIOCGIFDSTADDR_IN6:
599 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
600 error = EINVAL;
601 break;
602 }
603 /*
604 * XXX: should we check if ifa_dstaddr is NULL and return
605 * an error?
606 */
607 ifr->ifr_dstaddr = ia->ia_dstaddr;
608 error = sa6_recoverscope(&ifr->ifr_dstaddr);
609 break;
610
611 case SIOCGIFNETMASK_IN6:
612 ifr->ifr_addr = ia->ia_prefixmask;
613 break;
614
615 case SIOCGIFAFLAG_IN6:
616 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
617 break;
618
619 case SIOCGIFSTAT_IN6:
620 if (ifp == NULL) {
621 error = EINVAL;
622 break;
623 }
624 memset(&ifr->ifr_ifru.ifru_stat, 0,
625 sizeof(ifr->ifr_ifru.ifru_stat));
626 ifr->ifr_ifru.ifru_stat =
627 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
628 break;
629
630 case SIOCGIFSTAT_ICMP6:
631 if (ifp == NULL) {
632 error = EINVAL;
633 break;
634 }
635 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0,
636 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
637 ifr->ifr_ifru.ifru_icmp6stat =
638 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
639 break;
640
641 #ifdef OSIOCGIFALIFETIME_IN6
642 case OSIOCGIFALIFETIME_IN6:
643 #endif
644 case SIOCGIFALIFETIME_IN6:
645 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
646 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
647 time_t maxexpire;
648 struct in6_addrlifetime *retlt =
649 &ifr->ifr_ifru.ifru_lifetime;
650
651 /*
652 * XXX: adjust expiration time assuming time_t is
653 * signed.
654 */
655 maxexpire = ((time_t)~0) &
656 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1));
657 if (ia->ia6_lifetime.ia6t_vltime <
658 maxexpire - ia->ia6_updatetime) {
659 retlt->ia6t_expire = ia->ia6_updatetime +
660 ia->ia6_lifetime.ia6t_vltime;
661 retlt->ia6t_expire = retlt->ia6t_expire ?
662 time_mono_to_wall(retlt->ia6t_expire) :
663 0;
664 } else
665 retlt->ia6t_expire = maxexpire;
666 }
667 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
668 time_t maxexpire;
669 struct in6_addrlifetime *retlt =
670 &ifr->ifr_ifru.ifru_lifetime;
671
672 /*
673 * XXX: adjust expiration time assuming time_t is
674 * signed.
675 */
676 maxexpire = ((time_t)~0) &
677 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1));
678 if (ia->ia6_lifetime.ia6t_pltime <
679 maxexpire - ia->ia6_updatetime) {
680 retlt->ia6t_preferred = ia->ia6_updatetime +
681 ia->ia6_lifetime.ia6t_pltime;
682 retlt->ia6t_preferred = retlt->ia6t_preferred ?
683 time_mono_to_wall(retlt->ia6t_preferred) :
684 0;
685 } else
686 retlt->ia6t_preferred = maxexpire;
687 }
688 #ifdef OSIOCFIFALIFETIME_IN6
689 if (cmd == OSIOCFIFALIFETIME_IN6)
690 in6_addrlifetime_to_in6_addrlifetime50(
691 &ifr->ifru.ifru_lifetime);
692 #endif
693 break;
694
695 #ifdef OSIOCAIFADDR_IN6
696 case OSIOCAIFADDR_IN6:
697 in6_aliasreq50_to_in6_aliasreq(ifra);
698 #endif
699 /*FALLTHROUGH*/
700 case SIOCAIFADDR_IN6:
701 {
702 struct in6_addrlifetime *lt;
703
704 /* reject read-only flags */
705 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 ||
706 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 ||
707 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 ||
708 (ifra->ifra_flags & IN6_IFF_NODAD) != 0) {
709 error = EINVAL;
710 break;
711 }
712 /*
713 * ia6t_expire and ia6t_preferred won't be used for now,
714 * so just in case.
715 */
716 lt = &ifra->ifra_lifetime;
717 if (lt->ia6t_expire != 0)
718 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire);
719 if (lt->ia6t_preferred != 0)
720 lt->ia6t_preferred =
721 time_wall_to_mono(lt->ia6t_preferred);
722 /*
723 * make (ia == NULL) or update (ia != NULL) the interface
724 * address structure, and link it to the list.
725 */
726 int s = splsoftnet();
727 error = in6_update_ifa1(ifp, ifra, &ia, &psref, 0);
728 splx(s);
729 /*
730 * in6_update_ifa1 doesn't create the address if its
731 * valid lifetime (vltime) is zero, since we would just
732 * delete the address immediately in that case anyway.
733 * So it may succeed but return null ia. In that case,
734 * nothing left to do.
735 */
736 if (error || ia == NULL)
737 break;
738 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
739 break;
740 }
741
742 case SIOCDIFADDR_IN6:
743 ia6_release(ia, &psref);
744 ifaref(&ia->ia_ifa);
745 in6_purgeaddr(&ia->ia_ifa);
746 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
747 ifafree(&ia->ia_ifa);
748 ia = NULL;
749 break;
750
751 default:
752 error = ENOTTY;
753 }
754 release:
755 ia6_release(ia, &psref);
756 out:
757 curlwp_bindx(bound);
758 return error;
759 }
760
761 int
in6_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)762 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
763 {
764 int error, s;
765
766 switch (cmd) {
767 #ifdef OSIOCSIFINFO_IN6_90
768 case OSIOCSIFINFO_FLAGS_90:
769 case OSIOCSIFINFO_IN6_90:
770 case OSIOCSDEFIFACE_IN6:
771 case OSIOCSNDFLUSH_IN6:
772 case OSIOCSPFXFLUSH_IN6:
773 case OSIOCSRTRFLUSH_IN6:
774 #endif
775 case SIOCSIFINFO_FLAGS:
776 case SIOCSIFINFO_IN6:
777
778 case SIOCALIFADDR:
779 case SIOCDLIFADDR:
780
781 case SIOCDIFADDR_IN6:
782 #ifdef OSIOCAIFADDR_IN6
783 case OSIOCAIFADDR_IN6:
784 #endif
785 case SIOCAIFADDR_IN6:
786
787 case SIOCAADDRCTL_POLICY:
788 case SIOCDADDRCTL_POLICY:
789
790 if (kauth_authorize_network(kauth_cred_get(),
791 KAUTH_NETWORK_SOCKET,
792 KAUTH_REQ_NETWORK_SOCKET_SETPRIV,
793 so, NULL, NULL))
794 return EPERM;
795 break;
796 }
797
798 s = splsoftnet();
799 #ifndef NET_MPSAFE
800 KASSERT(KERNEL_LOCKED_P());
801 #endif
802 error = in6_control1(so , cmd, data, ifp);
803 splx(s);
804 return error;
805 }
806
807 static int
in6_get_llsol_addr(struct in6_addr * llsol,struct ifnet * ifp,struct in6_addr * ip6)808 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp,
809 struct in6_addr *ip6)
810 {
811 int error;
812
813 memset(llsol, 0, sizeof(struct in6_addr));
814 llsol->s6_addr16[0] = htons(0xff02);
815 llsol->s6_addr32[1] = 0;
816 llsol->s6_addr32[2] = htonl(1);
817 llsol->s6_addr32[3] = ip6->s6_addr32[3];
818 llsol->s6_addr8[12] = 0xff;
819
820 error = in6_setscope(llsol, ifp, NULL);
821 if (error != 0) {
822 /* XXX: should not happen */
823 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
824 }
825
826 return error;
827 }
828
829 static int
in6_join_mcastgroups(struct in6_aliasreq * ifra,struct in6_ifaddr * ia,struct ifnet * ifp,int flags)830 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia,
831 struct ifnet *ifp, int flags)
832 {
833 int error;
834 struct sockaddr_in6 mltaddr, mltmask;
835 struct in6_multi_mship *imm;
836 struct in6_addr llsol;
837 struct rtentry *rt;
838 int dad_delay;
839 char ip6buf[INET6_ADDRSTRLEN];
840
841 /* join solicited multicast addr for new host id */
842 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr);
843 if (error != 0)
844 goto out;
845 dad_delay = 0;
846 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
847 /*
848 * We need a random delay for DAD on the address
849 * being configured. It also means delaying
850 * transmission of the corresponding MLD report to
851 * avoid report collision.
852 * [draft-ietf-ipv6-rfc2462bis-02.txt]
853 */
854 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz);
855 }
856
857 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
858 /* join solicited multicast addr for new host id */
859 imm = in6_joingroup(ifp, &llsol, &error, dad_delay);
860 if (!imm) {
861 nd6log(LOG_ERR,
862 "addmulti failed for %s on %s (errno=%d)\n",
863 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error);
864 goto out;
865 }
866 mutex_enter(&in6_ifaddr_lock);
867 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
868 mutex_exit(&in6_ifaddr_lock);
869
870 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0);
871
872 /*
873 * join link-local all-nodes address
874 */
875 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes,
876 0, 0, 0);
877 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
878 goto out; /* XXX: should not fail */
879
880 /*
881 * XXX: do we really need this automatic routes?
882 * We should probably reconsider this stuff. Most applications
883 * actually do not need the routes, since they usually specify
884 * the outgoing interface.
885 */
886 rt = rtalloc1(sin6tosa(&mltaddr), 0);
887 if (rt) {
888 if (memcmp(&mltaddr.sin6_addr,
889 &satocsin6(rt_getkey(rt))->sin6_addr,
890 MLTMASK_LEN)) {
891 rt_unref(rt);
892 rt = NULL;
893 } else if (rt->rt_ifp != ifp) {
894 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) "
895 "network %04x:%04x::/32 = %04x:%04x::/32\n",
896 __func__, rt->rt_ifp, ifp, ifp->if_xname,
897 ntohs(mltaddr.sin6_addr.s6_addr16[0]),
898 ntohs(mltaddr.sin6_addr.s6_addr16[1]),
899 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0],
900 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]);
901 #ifdef NET_MPSAFE
902 error = rt_update_prepare(rt);
903 if (error == 0) {
904 rt_replace_ifa(rt, &ia->ia_ifa);
905 rt->rt_ifp = ifp;
906 rt_update_finish(rt);
907 } else {
908 /*
909 * If error != 0, the rtentry is being
910 * destroyed, so doing nothing doesn't
911 * matter.
912 */
913 }
914 #else
915 rt_replace_ifa(rt, &ia->ia_ifa);
916 rt->rt_ifp = ifp;
917 #endif
918 }
919 }
920 if (!rt) {
921 struct rt_addrinfo info;
922
923 memset(&info, 0, sizeof(info));
924 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr);
925 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr);
926 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask);
927 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr);
928 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */
929 info.rti_flags = RTF_UP | RTF_CONNECTED;
930 error = rtrequest1(RTM_ADD, &info, NULL);
931 if (error)
932 goto out;
933 } else {
934 rt_unref(rt);
935 }
936 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
937 if (!imm) {
938 nd6log(LOG_WARNING,
939 "addmulti failed for %s on %s (errno=%d)\n",
940 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
941 if_name(ifp), error);
942 goto out;
943 }
944 mutex_enter(&in6_ifaddr_lock);
945 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
946 mutex_exit(&in6_ifaddr_lock);
947
948 /*
949 * join node information group address
950 */
951 dad_delay = 0;
952 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
953 /*
954 * The spec doesn't say anything about delay for this
955 * group, but the same logic should apply.
956 */
957 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz);
958 }
959 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0)
960 ;
961 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
962 dad_delay)) == NULL) { /* XXX jinmei */
963 nd6log(LOG_WARNING,
964 "addmulti failed for %s on %s (errno=%d)\n",
965 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
966 if_name(ifp), error);
967 /* XXX not very fatal, go on... */
968 } else {
969 mutex_enter(&in6_ifaddr_lock);
970 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
971 mutex_exit(&in6_ifaddr_lock);
972 }
973
974
975 /*
976 * join interface-local all-nodes address.
977 * (ff01::1%ifN, and ff01::%ifN/32)
978 */
979 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
980 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
981 goto out; /* XXX: should not fail */
982
983 /* XXX: again, do we really need the route? */
984 rt = rtalloc1(sin6tosa(&mltaddr), 0);
985 if (rt) {
986 /* 32bit came from "mltmask" */
987 if (memcmp(&mltaddr.sin6_addr,
988 &satocsin6(rt_getkey(rt))->sin6_addr,
989 32 / NBBY)) {
990 rt_unref(rt);
991 rt = NULL;
992 } else if (rt->rt_ifp != ifp) {
993 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) "
994 "network %04x:%04x::/32 = %04x:%04x::/32\n",
995 __func__, rt->rt_ifp, ifp, ifp->if_xname,
996 ntohs(mltaddr.sin6_addr.s6_addr16[0]),
997 ntohs(mltaddr.sin6_addr.s6_addr16[1]),
998 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0],
999 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]);
1000 #ifdef NET_MPSAFE
1001 error = rt_update_prepare(rt);
1002 if (error == 0) {
1003 rt_replace_ifa(rt, &ia->ia_ifa);
1004 rt->rt_ifp = ifp;
1005 rt_update_finish(rt);
1006 } else {
1007 /*
1008 * If error != 0, the rtentry is being
1009 * destroyed, so doing nothing doesn't
1010 * matter.
1011 */
1012 }
1013 #else
1014 rt_replace_ifa(rt, &ia->ia_ifa);
1015 rt->rt_ifp = ifp;
1016 #endif
1017 }
1018 }
1019 if (!rt) {
1020 struct rt_addrinfo info;
1021
1022 memset(&info, 0, sizeof(info));
1023 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr);
1024 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr);
1025 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask);
1026 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr);
1027 info.rti_flags = RTF_UP | RTF_CONNECTED;
1028 error = rtrequest1(RTM_ADD, &info, NULL);
1029 if (error)
1030 goto out;
1031 #undef MLTMASK_LEN
1032 } else {
1033 rt_unref(rt);
1034 }
1035 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1036 if (!imm) {
1037 nd6log(LOG_WARNING,
1038 "addmulti failed for %s on %s (errno=%d)\n",
1039 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
1040 if_name(ifp), error);
1041 goto out;
1042 } else {
1043 mutex_enter(&in6_ifaddr_lock);
1044 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1045 mutex_exit(&in6_ifaddr_lock);
1046 }
1047 return 0;
1048
1049 out:
1050 KASSERT(error != 0);
1051 return error;
1052 }
1053
1054 /*
1055 * Update parameters of an IPv6 interface address.
1056 * If necessary, a new entry is created and linked into address chains.
1057 * This function is separated from in6_control().
1058 * XXX: should this be performed under splsoftnet()?
1059 */
1060 static int
in6_update_ifa1(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr ** iap,struct psref * psref,int flags)1061 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra,
1062 struct in6_ifaddr **iap, struct psref *psref, int flags)
1063 {
1064 int error = 0, hostIsNew = 0, plen = -1;
1065 struct sockaddr_in6 dst6;
1066 struct in6_addrlifetime *lt;
1067 int dad_delay, was_tentative;
1068 struct in6_ifaddr *ia = iap ? *iap : NULL;
1069 char ip6buf[INET6_ADDRSTRLEN];
1070 bool addrmaskNotChanged = false;
1071 bool send_rtm_newaddr = (ip6_param_rt_msg == 1);
1072 int saved_flags = 0;
1073
1074 KASSERT((iap == NULL && psref == NULL) ||
1075 (iap != NULL && psref != NULL));
1076
1077 /* Validate parameters */
1078 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1079 return EINVAL;
1080
1081 /*
1082 * The destination address for a p2p link must have a family
1083 * of AF_UNSPEC or AF_INET6.
1084 */
1085 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1086 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1087 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1088 return EAFNOSUPPORT;
1089 /*
1090 * validate ifra_prefixmask. don't check sin6_family, netmask
1091 * does not carry fields other than sin6_len.
1092 */
1093 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1094 return EINVAL;
1095 /*
1096 * Because the IPv6 address architecture is classless, we require
1097 * users to specify a (non 0) prefix length (mask) for a new address.
1098 * We also require the prefix (when specified) mask is valid, and thus
1099 * reject a non-consecutive mask.
1100 */
1101 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1102 return EINVAL;
1103 if (ifra->ifra_prefixmask.sin6_len != 0) {
1104 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1105 (u_char *)&ifra->ifra_prefixmask +
1106 ifra->ifra_prefixmask.sin6_len);
1107 if (plen <= 0)
1108 return EINVAL;
1109 } else {
1110 /*
1111 * In this case, ia must not be NULL. We just use its prefix
1112 * length.
1113 */
1114 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1115 }
1116 /*
1117 * If the destination address on a p2p interface is specified,
1118 * and the address is a scoped one, validate/set the scope
1119 * zone identifier.
1120 */
1121 dst6 = ifra->ifra_dstaddr;
1122 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1123 (dst6.sin6_family == AF_INET6)) {
1124 struct in6_addr in6_tmp;
1125 u_int32_t zoneid;
1126
1127 in6_tmp = dst6.sin6_addr;
1128 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1129 return EINVAL; /* XXX: should be impossible */
1130
1131 if (dst6.sin6_scope_id != 0) {
1132 if (dst6.sin6_scope_id != zoneid)
1133 return EINVAL;
1134 } else /* user omit to specify the ID. */
1135 dst6.sin6_scope_id = zoneid;
1136
1137 /* convert into the internal form */
1138 if (sa6_embedscope(&dst6, 0))
1139 return EINVAL; /* XXX: should be impossible */
1140 }
1141 /*
1142 * The destination address can be specified only for a p2p or a
1143 * loopback interface. If specified, the corresponding prefix length
1144 * must be 128.
1145 */
1146 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1147 #ifdef FORCE_P2PPLEN
1148 int i;
1149 #endif
1150
1151 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1152 /* XXX: noisy message */
1153 nd6log(LOG_INFO, "a destination can "
1154 "be specified for a p2p or a loopback IF only\n");
1155 return EINVAL;
1156 }
1157 if (plen != 128) {
1158 nd6log(LOG_INFO, "prefixlen should "
1159 "be 128 when dstaddr is specified\n");
1160 #ifdef FORCE_P2PPLEN
1161 /*
1162 * To be compatible with old configurations,
1163 * such as ifconfig gif0 inet6 2001::1 2001::2
1164 * prefixlen 126, we override the specified
1165 * prefixmask as if the prefix length was 128.
1166 */
1167 ifra->ifra_prefixmask.sin6_len =
1168 sizeof(struct sockaddr_in6);
1169 for (i = 0; i < 4; i++)
1170 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
1171 0xffffffff;
1172 plen = 128;
1173 #else
1174 return EINVAL;
1175 #endif
1176 }
1177 }
1178 /* lifetime consistency check */
1179 lt = &ifra->ifra_lifetime;
1180 if (lt->ia6t_pltime > lt->ia6t_vltime)
1181 return EINVAL;
1182 if (lt->ia6t_vltime == 0) {
1183 /*
1184 * the following log might be noisy, but this is a typical
1185 * configuration mistake or a tool's bug.
1186 */
1187 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n",
1188 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr));
1189
1190 if (ia == NULL)
1191 return 0; /* there's nothing to do */
1192 }
1193
1194 #define sin6eq(a, b) \
1195 ((a)->sin6_len == sizeof(struct sockaddr_in6) && \
1196 (b)->sin6_len == sizeof(struct sockaddr_in6) && \
1197 IN6_ARE_ADDR_EQUAL(&(a)->sin6_addr, &(b)->sin6_addr))
1198
1199 if (!send_rtm_newaddr) {
1200 if (ia != NULL &&
1201 sin6eq(&ifra->ifra_addr, &ia->ia_addr) &&
1202 sin6eq(&ifra->ifra_prefixmask, &ia->ia_prefixmask)) {
1203 addrmaskNotChanged = true;
1204 saved_flags = ia->ia6_flags; /* check it later */
1205 }
1206 }
1207 #undef sin6eq
1208
1209 /*
1210 * If this is a new address, allocate a new ifaddr and link it
1211 * into chains.
1212 */
1213 if (ia == NULL) {
1214 hostIsNew = 1;
1215 /*
1216 * When in6_update_ifa() is called in a process of a received
1217 * RA, it is called under an interrupt context. So, we should
1218 * call malloc with M_NOWAIT.
1219 */
1220 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO);
1221 if (ia == NULL)
1222 return ENOBUFS;
1223 LIST_INIT(&ia->ia6_memberships);
1224 /* Initialize the address and masks, and put time stamp */
1225 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr);
1226 ia->ia_addr.sin6_family = AF_INET6;
1227 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1228 ia->ia6_createtime = time_uptime;
1229 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1230 /*
1231 * XXX: some functions expect that ifa_dstaddr is not
1232 * NULL for p2p interfaces.
1233 */
1234 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr);
1235 } else {
1236 ia->ia_ifa.ifa_dstaddr = NULL;
1237 }
1238 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask);
1239
1240 ia->ia_ifp = ifp;
1241 IN6_ADDRLIST_ENTRY_INIT(ia);
1242 ifa_psref_init(&ia->ia_ifa);
1243 }
1244
1245 /* update timestamp */
1246 ia->ia6_updatetime = time_uptime;
1247
1248 /* set prefix mask */
1249 if (ifra->ifra_prefixmask.sin6_len) {
1250 if (ia->ia_prefixmask.sin6_len) {
1251 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr,
1252 &ifra->ifra_prefixmask.sin6_addr))
1253 in6_ifremprefix(ia);
1254 }
1255 ia->ia_prefixmask = ifra->ifra_prefixmask;
1256 }
1257
1258 /* Set destination address. */
1259 if (dst6.sin6_family == AF_INET6) {
1260 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
1261 &ia->ia_dstaddr.sin6_addr))
1262 in6_ifremprefix(ia);
1263 ia->ia_dstaddr = dst6;
1264 }
1265
1266 /*
1267 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1268 * to see if the address is deprecated or invalidated, but initialize
1269 * these members for applications.
1270 */
1271 ia->ia6_lifetime = ifra->ifra_lifetime;
1272 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1273 ia->ia6_lifetime.ia6t_expire =
1274 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1275 } else
1276 ia->ia6_lifetime.ia6t_expire = 0;
1277 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1278 ia->ia6_lifetime.ia6t_preferred =
1279 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1280 } else
1281 ia->ia6_lifetime.ia6t_preferred = 0;
1282
1283 /*
1284 * configure address flags.
1285 * We need to preserve tentative state so DAD works if
1286 * something adds the same address before DAD finishes.
1287 */
1288 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED);
1289 ia->ia6_flags = ifra->ifra_flags;
1290
1291 /*
1292 * Make the address tentative before joining multicast addresses,
1293 * so that corresponding MLD responses would not have a tentative
1294 * source address.
1295 */
1296 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1297 if (ifp->if_link_state == LINK_STATE_DOWN) {
1298 ia->ia6_flags |= IN6_IFF_DETACHED;
1299 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1300 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp) &&
1301 ip6_dad_enabled()) {
1302 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1303 }
1304
1305 /*
1306 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1307 * userland, make it deprecated.
1308 */
1309 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1310 ia->ia6_lifetime.ia6t_pltime = 0;
1311 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1312 }
1313
1314 if (!send_rtm_newaddr) {
1315 /*
1316 * We will not send RTM_NEWADDR if the only difference between
1317 * ia and ifra is preferred/valid lifetimes, because it is not
1318 * very useful for userland programs to be notified of that
1319 * changes.
1320 */
1321 if (addrmaskNotChanged && ia->ia6_flags == saved_flags)
1322 return 0;
1323 }
1324
1325 if (hostIsNew) {
1326 /*
1327 * We need a reference to ia before calling in6_ifinit.
1328 * Otherwise ia can be freed in in6_ifinit accidentally.
1329 */
1330 ifaref(&ia->ia_ifa);
1331 }
1332
1333 /* Must execute in6_ifinit and ifa_insert atomically */
1334 mutex_enter(&in6_ifaddr_lock);
1335
1336 /* reset the interface and routing table appropriately. */
1337 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew);
1338 if (error != 0) {
1339 if (hostIsNew)
1340 free(ia, M_IFADDR);
1341 mutex_exit(&in6_ifaddr_lock);
1342 return error;
1343 }
1344
1345 /*
1346 * We are done if we have simply modified an existing address.
1347 */
1348 if (!hostIsNew) {
1349 mutex_exit(&in6_ifaddr_lock);
1350 return error;
1351 }
1352
1353 /*
1354 * Insert ia to the global list and ifa to the interface's list.
1355 * A reference to it is already gained above.
1356 */
1357 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia);
1358 ifa_insert(ifp, &ia->ia_ifa);
1359
1360 mutex_exit(&in6_ifaddr_lock);
1361
1362 /*
1363 * Beyond this point, we should call in6_purgeaddr upon an error,
1364 * not just go to unlink.
1365 */
1366
1367 /* join necessary multicast groups */
1368 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1369 error = in6_join_mcastgroups(ifra, ia, ifp, flags);
1370 if (error != 0)
1371 goto cleanup;
1372 }
1373
1374 if (nd6_need_cache(ifp)) {
1375 /* XXX maybe unnecessary */
1376 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1377 ia->ia_ifa.ifa_flags |= RTF_CONNECTED;
1378 }
1379
1380 /*
1381 * Perform DAD, if needed.
1382 * XXX It may be of use, if we can administratively
1383 * disable DAD.
1384 */
1385 if (hostIsNew && if_do_dad(ifp) &&
1386 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1387 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1388 {
1389 int mindelay, maxdelay;
1390
1391 dad_delay = 0;
1392 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1393 struct in6_addr llsol;
1394 struct in6_multi *in6m_sol = NULL;
1395 /*
1396 * We need to impose a delay before sending an NS
1397 * for DAD. Check if we also needed a delay for the
1398 * corresponding MLD message. If we did, the delay
1399 * should be larger than the MLD delay (this could be
1400 * relaxed a bit, but this simple logic is at least
1401 * safe).
1402 */
1403 mindelay = 0;
1404 error = in6_get_llsol_addr(&llsol, ifp,
1405 &ifra->ifra_addr.sin6_addr);
1406 in6_multi_lock(RW_READER);
1407 if (error == 0)
1408 in6m_sol = in6_lookup_multi(&llsol, ifp);
1409 if (in6m_sol != NULL &&
1410 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1411 mindelay = in6m_sol->in6m_timer;
1412 }
1413 in6_multi_unlock();
1414 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1415 if (maxdelay - mindelay == 0)
1416 dad_delay = 0;
1417 else {
1418 dad_delay =
1419 (cprng_fast32() % (maxdelay - mindelay)) +
1420 mindelay;
1421 }
1422 }
1423 /* +1 ensures callout is always used */
1424 nd6_dad_start(&ia->ia_ifa, dad_delay + 1);
1425 }
1426
1427 if (iap != NULL) {
1428 *iap = ia;
1429 if (hostIsNew)
1430 ia6_acquire(ia, psref);
1431 }
1432
1433 return 0;
1434
1435 cleanup:
1436 in6_purgeaddr(&ia->ia_ifa);
1437 return error;
1438 }
1439
1440 int
in6_update_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,int flags)1441 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1442 {
1443 int rc, s;
1444
1445 s = splsoftnet();
1446 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags);
1447 splx(s);
1448 return rc;
1449 }
1450
1451 void
in6_purgeaddr(struct ifaddr * ifa)1452 in6_purgeaddr(struct ifaddr *ifa)
1453 {
1454 struct ifnet *ifp = ifa->ifa_ifp;
1455 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1456 struct in6_multi_mship *imm;
1457
1458 /* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */
1459 KASSERT(IFNET_LOCKED(ifp));
1460
1461 ifa->ifa_flags |= IFA_DESTROYING;
1462
1463 /* stop DAD processing */
1464 nd6_dad_stop(ifa);
1465
1466 /* Delete any network route. */
1467 in6_ifremprefix(ia);
1468
1469 /* Remove ownaddr's loopback rtentry, if it exists. */
1470 in6_ifremlocal(&(ia->ia_ifa));
1471
1472 /*
1473 * leave from multicast groups we have joined for the interface
1474 */
1475 again:
1476 mutex_enter(&in6_ifaddr_lock);
1477 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1478 struct in6_multi *in6m __diagused = imm->i6mm_maddr;
1479 KASSERTMSG(in6m == NULL || in6m->in6m_ifp == ifp,
1480 "in6m_ifp=%s ifp=%s", in6m ? in6m->in6m_ifp->if_xname : NULL,
1481 ifp->if_xname);
1482 LIST_REMOVE(imm, i6mm_chain);
1483 mutex_exit(&in6_ifaddr_lock);
1484
1485 in6_leavegroup(imm);
1486 goto again;
1487 }
1488 mutex_exit(&in6_ifaddr_lock);
1489
1490 in6_unlink_ifa(ia, ifp);
1491 }
1492
1493 static void
in6_unlink_ifa(struct in6_ifaddr * ia,struct ifnet * ifp)1494 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1495 {
1496 int s = splsoftnet();
1497
1498 mutex_enter(&in6_ifaddr_lock);
1499 IN6_ADDRLIST_WRITER_REMOVE(ia);
1500 ifa_remove(ifp, &ia->ia_ifa);
1501 /* Assume ifa_remove called pserialize_perform and psref_destroy */
1502 mutex_exit(&in6_ifaddr_lock);
1503 IN6_ADDRLIST_ENTRY_DESTROY(ia);
1504
1505 /*
1506 * release another refcnt for the link from in6_ifaddr.
1507 * Note that we should decrement the refcnt at least once for all *BSD.
1508 */
1509 ifafree(&ia->ia_ifa);
1510
1511 splx(s);
1512 }
1513
1514 void
in6_purgeif(struct ifnet * ifp)1515 in6_purgeif(struct ifnet *ifp)
1516 {
1517
1518 IFNET_LOCK(ifp);
1519 in6_ifdetach(ifp);
1520 IFNET_UNLOCK(ifp);
1521 }
1522
1523 void
in6_purge_mcast_references(struct in6_multi * in6m)1524 in6_purge_mcast_references(struct in6_multi *in6m)
1525 {
1526 struct in6_ifaddr *ia;
1527
1528 KASSERT(in6_multi_locked(RW_WRITER));
1529
1530 mutex_enter(&in6_ifaddr_lock);
1531 IN6_ADDRLIST_WRITER_FOREACH(ia) {
1532 struct in6_multi_mship *imm;
1533 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1534 if (imm->i6mm_maddr == in6m)
1535 imm->i6mm_maddr = NULL;
1536 }
1537 }
1538 mutex_exit(&in6_ifaddr_lock);
1539 }
1540
1541 /*
1542 * SIOC[GAD]LIFADDR.
1543 * SIOCGLIFADDR: get first address. (?)
1544 * SIOCGLIFADDR with IFLR_PREFIX:
1545 * get first address that matches the specified prefix.
1546 * SIOCALIFADDR: add the specified address.
1547 * SIOCALIFADDR with IFLR_PREFIX:
1548 * add the specified prefix, filling hostid part from
1549 * the first link-local address. prefixlen must be <= 64.
1550 * SIOCDLIFADDR: delete the specified address.
1551 * SIOCDLIFADDR with IFLR_PREFIX:
1552 * delete the first address that matches the specified prefix.
1553 * return values:
1554 * EINVAL on invalid parameters
1555 * EADDRNOTAVAIL on prefix match failed/specified address not found
1556 * other values may be returned from in6_ioctl()
1557 *
1558 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1559 * this is to accommodate address naming scheme other than RFC2374,
1560 * in the future.
1561 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1562 * address encoding scheme. (see figure on page 8)
1563 */
1564 static int
in6_lifaddr_ioctl(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)1565 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data,
1566 struct ifnet *ifp)
1567 {
1568 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */
1569 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1570 struct ifaddr *ifa;
1571 struct sockaddr *sa;
1572
1573 /* sanity checks */
1574 if (!data || !ifp) {
1575 panic("invalid argument to in6_lifaddr_ioctl");
1576 /* NOTREACHED */
1577 }
1578
1579 switch (cmd) {
1580 case SIOCGLIFADDR:
1581 /* address must be specified on GET with IFLR_PREFIX */
1582 if ((iflr->flags & IFLR_PREFIX) == 0)
1583 break;
1584 /* FALLTHROUGH */
1585 case SIOCALIFADDR:
1586 case SIOCDLIFADDR:
1587 /* address must be specified on ADD and DELETE */
1588 sa = (struct sockaddr *)&iflr->addr;
1589 if (sa->sa_family != AF_INET6)
1590 return EINVAL;
1591 if (sa->sa_len != sizeof(struct sockaddr_in6))
1592 return EINVAL;
1593 /* XXX need improvement */
1594 sa = (struct sockaddr *)&iflr->dstaddr;
1595 if (sa->sa_family && sa->sa_family != AF_INET6)
1596 return EINVAL;
1597 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1598 return EINVAL;
1599 break;
1600 default: /* shouldn't happen */
1601 #if 0
1602 panic("invalid cmd to in6_lifaddr_ioctl");
1603 /* NOTREACHED */
1604 #else
1605 return EOPNOTSUPP;
1606 #endif
1607 }
1608 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen)
1609 return EINVAL;
1610
1611 switch (cmd) {
1612 case SIOCALIFADDR:
1613 {
1614 struct in6_aliasreq ifra;
1615 struct in6_addr *xhostid = NULL;
1616 int prefixlen;
1617 int bound = curlwp_bind();
1618 struct psref psref;
1619
1620 if ((iflr->flags & IFLR_PREFIX) != 0) {
1621 struct sockaddr_in6 *sin6;
1622
1623 /*
1624 * xhostid is to fill in the hostid part of the
1625 * address. xhostid points to the first link-local
1626 * address attached to the interface.
1627 */
1628 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref);
1629 if (ia == NULL) {
1630 curlwp_bindx(bound);
1631 return EADDRNOTAVAIL;
1632 }
1633 xhostid = IFA_IN6(&ia->ia_ifa);
1634
1635 /* prefixlen must be <= 64. */
1636 if (64 < iflr->prefixlen) {
1637 ia6_release(ia, &psref);
1638 curlwp_bindx(bound);
1639 return EINVAL;
1640 }
1641 prefixlen = iflr->prefixlen;
1642
1643 /* hostid part must be zero. */
1644 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1645 if (sin6->sin6_addr.s6_addr32[2] != 0
1646 || sin6->sin6_addr.s6_addr32[3] != 0) {
1647 ia6_release(ia, &psref);
1648 curlwp_bindx(bound);
1649 return EINVAL;
1650 }
1651 } else
1652 prefixlen = iflr->prefixlen;
1653
1654 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1655 memset(&ifra, 0, sizeof(ifra));
1656 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name));
1657
1658 memcpy(&ifra.ifra_addr, &iflr->addr,
1659 ((struct sockaddr *)&iflr->addr)->sa_len);
1660 if (xhostid) {
1661 /* fill in hostid part */
1662 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1663 xhostid->s6_addr32[2];
1664 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1665 xhostid->s6_addr32[3];
1666 }
1667
1668 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1669 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr,
1670 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1671 if (xhostid) {
1672 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1673 xhostid->s6_addr32[2];
1674 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1675 xhostid->s6_addr32[3];
1676 }
1677 }
1678 if (xhostid) {
1679 ia6_release(ia, &psref);
1680 ia = NULL;
1681 }
1682 curlwp_bindx(bound);
1683
1684 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1685 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1686
1687 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1688 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
1689 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1690 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp);
1691 }
1692 case SIOCGLIFADDR:
1693 case SIOCDLIFADDR:
1694 {
1695 struct in6_addr mask, candidate, match;
1696 struct sockaddr_in6 *sin6;
1697 int cmp;
1698 int error, s;
1699
1700 memset(&mask, 0, sizeof(mask));
1701 if (iflr->flags & IFLR_PREFIX) {
1702 /* lookup a prefix rather than address. */
1703 in6_prefixlen2mask(&mask, iflr->prefixlen);
1704
1705 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1706 memcpy(&match, &sin6->sin6_addr, sizeof(match));
1707 match.s6_addr32[0] &= mask.s6_addr32[0];
1708 match.s6_addr32[1] &= mask.s6_addr32[1];
1709 match.s6_addr32[2] &= mask.s6_addr32[2];
1710 match.s6_addr32[3] &= mask.s6_addr32[3];
1711
1712 /* if you set extra bits, that's wrong */
1713 if (memcmp(&match, &sin6->sin6_addr, sizeof(match)))
1714 return EINVAL;
1715
1716 cmp = 1;
1717 } else {
1718 if (cmd == SIOCGLIFADDR) {
1719 /* on getting an address, take the 1st match */
1720 cmp = 0; /* XXX */
1721 } else {
1722 /* on deleting an address, do exact match */
1723 in6_prefixlen2mask(&mask, 128);
1724 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1725 memcpy(&match, &sin6->sin6_addr, sizeof(match));
1726
1727 cmp = 1;
1728 }
1729 }
1730
1731 s = pserialize_read_enter();
1732 IFADDR_READER_FOREACH(ifa, ifp) {
1733 if (ifa->ifa_addr->sa_family != AF_INET6)
1734 continue;
1735 if (!cmp)
1736 break;
1737
1738 /*
1739 * XXX: this is adhoc, but is necessary to allow
1740 * a user to specify fe80::/64 (not /10) for a
1741 * link-local address.
1742 */
1743 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate));
1744 in6_clearscope(&candidate);
1745 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1746 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1747 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1748 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1749 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1750 break;
1751 }
1752 if (!ifa) {
1753 error = EADDRNOTAVAIL;
1754 goto error;
1755 }
1756 ia = ifa2ia6(ifa);
1757
1758 if (cmd == SIOCGLIFADDR) {
1759 /* fill in the if_laddrreq structure */
1760 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len);
1761 error = sa6_recoverscope(
1762 (struct sockaddr_in6 *)&iflr->addr);
1763 if (error != 0)
1764 goto error;
1765
1766 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1767 memcpy(&iflr->dstaddr, &ia->ia_dstaddr,
1768 ia->ia_dstaddr.sin6_len);
1769 error = sa6_recoverscope(
1770 (struct sockaddr_in6 *)&iflr->dstaddr);
1771 if (error != 0)
1772 goto error;
1773 } else
1774 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr));
1775
1776 iflr->prefixlen =
1777 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1778
1779 iflr->flags = ia->ia6_flags; /* XXX */
1780
1781 error = 0;
1782 } else {
1783 struct in6_aliasreq ifra;
1784
1785 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1786 memset(&ifra, 0, sizeof(ifra));
1787 memcpy(ifra.ifra_name, iflr->iflr_name,
1788 sizeof(ifra.ifra_name));
1789
1790 memcpy(&ifra.ifra_addr, &ia->ia_addr,
1791 ia->ia_addr.sin6_len);
1792 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1793 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr,
1794 ia->ia_dstaddr.sin6_len);
1795 } else {
1796 memset(&ifra.ifra_dstaddr, 0,
1797 sizeof(ifra.ifra_dstaddr));
1798 }
1799 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask,
1800 ia->ia_prefixmask.sin6_len);
1801
1802 ifra.ifra_flags = ia->ia6_flags;
1803 pserialize_read_exit(s);
1804
1805 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp);
1806 }
1807 error:
1808 pserialize_read_exit(s);
1809 return error;
1810 }
1811 }
1812
1813 return EOPNOTSUPP; /* just for safety */
1814 }
1815
1816 /*
1817 * Initialize an interface's internet6 address
1818 * and routing table entry.
1819 */
1820 static int
in6_ifinit(struct ifnet * ifp,struct in6_ifaddr * ia,const struct sockaddr_in6 * sin6,int newhost)1821 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1822 const struct sockaddr_in6 *sin6, int newhost)
1823 {
1824 int error = 0, ifacount = 0;
1825 int s;
1826 struct ifaddr *ifa;
1827
1828 KASSERT(mutex_owned(&in6_ifaddr_lock));
1829
1830 /*
1831 * Give the interface a chance to initialize
1832 * if this is its first address,
1833 * and to validate the address if necessary.
1834 */
1835 s = pserialize_read_enter();
1836 IFADDR_READER_FOREACH(ifa, ifp) {
1837 if (ifa->ifa_addr->sa_family != AF_INET6)
1838 continue;
1839 ifacount++;
1840 }
1841 pserialize_read_exit(s);
1842
1843 ia->ia_addr = *sin6;
1844
1845 if (ifacount == 0 &&
1846 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) {
1847 return error;
1848 }
1849
1850 ia->ia_ifa.ifa_metric = ifp->if_metric;
1851
1852 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1853
1854 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1855 if (newhost) {
1856 /* set the rtrequest function to create llinfo */
1857 if (ifp->if_flags & IFF_POINTOPOINT)
1858 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest;
1859 else if ((ifp->if_flags & IFF_LOOPBACK) == 0)
1860 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1861 in6_ifaddlocal(&ia->ia_ifa);
1862 } else {
1863 /* Inform the routing socket of new flags/timings */
1864 rt_addrmsg(RTM_NEWADDR, &ia->ia_ifa);
1865 }
1866
1867 /* Add the network prefix route. */
1868 if ((error = in6_ifaddprefix(ia)) != 0) {
1869 if (newhost)
1870 in6_ifremlocal(&ia->ia_ifa);
1871 return error;
1872 }
1873
1874 return error;
1875 }
1876
1877 static struct ifaddr *
bestifa(struct ifaddr * best_ifa,struct ifaddr * ifa)1878 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa)
1879 {
1880 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference)
1881 return ifa;
1882 return best_ifa;
1883 }
1884
1885 /*
1886 * Find an IPv6 interface link-local address specific to an interface.
1887 */
1888 struct in6_ifaddr *
in6ifa_ifpforlinklocal(const struct ifnet * ifp,const int ignoreflags)1889 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags)
1890 {
1891 struct ifaddr *best_ifa = NULL, *ifa;
1892
1893 IFADDR_READER_FOREACH(ifa, ifp) {
1894 if (ifa->ifa_addr->sa_family != AF_INET6)
1895 continue;
1896 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa)))
1897 continue;
1898 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0)
1899 continue;
1900 best_ifa = bestifa(best_ifa, ifa);
1901 }
1902
1903 return (struct in6_ifaddr *)best_ifa;
1904 }
1905
1906 struct in6_ifaddr *
in6ifa_ifpforlinklocal_psref(const struct ifnet * ifp,const int ignoreflags,struct psref * psref)1907 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags,
1908 struct psref *psref)
1909 {
1910 struct in6_ifaddr *ia;
1911 int s = pserialize_read_enter();
1912
1913 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags);
1914 if (ia != NULL)
1915 ia6_acquire(ia, psref);
1916 pserialize_read_exit(s);
1917
1918 return ia;
1919 }
1920
1921 /*
1922 * find the internet address corresponding to a given address.
1923 * ifaddr is returned referenced.
1924 */
1925 struct in6_ifaddr *
in6ifa_ifwithaddr(const struct in6_addr * addr,uint32_t zoneid)1926 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1927 {
1928 struct in6_ifaddr *ia;
1929 int s;
1930
1931 s = pserialize_read_enter();
1932 IN6_ADDRLIST_READER_FOREACH(ia) {
1933 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1934 if (zoneid != 0 &&
1935 zoneid != ia->ia_addr.sin6_scope_id)
1936 continue;
1937 ifaref(&ia->ia_ifa);
1938 break;
1939 }
1940 }
1941 pserialize_read_exit(s);
1942
1943 return ia;
1944 }
1945
1946 /*
1947 * find the internet address corresponding to a given interface and address.
1948 */
1949 struct in6_ifaddr *
in6ifa_ifpwithaddr(const struct ifnet * ifp,const struct in6_addr * addr)1950 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr)
1951 {
1952 struct ifaddr *best_ifa = NULL, *ifa;
1953
1954 IFADDR_READER_FOREACH(ifa, ifp) {
1955 if (ifa->ifa_addr->sa_family != AF_INET6)
1956 continue;
1957 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1958 continue;
1959 best_ifa = bestifa(best_ifa, ifa);
1960 }
1961
1962 return (struct in6_ifaddr *)best_ifa;
1963 }
1964
1965 struct in6_ifaddr *
in6ifa_ifpwithaddr_psref(const struct ifnet * ifp,const struct in6_addr * addr,struct psref * psref)1966 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr,
1967 struct psref *psref)
1968 {
1969 struct in6_ifaddr *ia;
1970 int s = pserialize_read_enter();
1971
1972 ia = in6ifa_ifpwithaddr(ifp, addr);
1973 if (ia != NULL)
1974 ia6_acquire(ia, psref);
1975 pserialize_read_exit(s);
1976
1977 return ia;
1978 }
1979
1980 static struct in6_ifaddr *
bestia(struct in6_ifaddr * best_ia,struct in6_ifaddr * ia)1981 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia)
1982 {
1983 if (best_ia == NULL ||
1984 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference)
1985 return ia;
1986 return best_ia;
1987 }
1988
1989 /*
1990 * Determine if an address is on a local network.
1991 */
1992 int
in6_localaddr(const struct in6_addr * in6)1993 in6_localaddr(const struct in6_addr *in6)
1994 {
1995 struct in6_ifaddr *ia;
1996 int s;
1997
1998 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1999 return 1;
2000
2001 s = pserialize_read_enter();
2002 IN6_ADDRLIST_READER_FOREACH(ia) {
2003 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2004 &ia->ia_prefixmask.sin6_addr)) {
2005 pserialize_read_exit(s);
2006 return 1;
2007 }
2008 }
2009 pserialize_read_exit(s);
2010
2011 return 0;
2012 }
2013
2014 int
in6_is_addr_deprecated(struct sockaddr_in6 * sa6)2015 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2016 {
2017 struct in6_ifaddr *ia;
2018 int s;
2019
2020 s = pserialize_read_enter();
2021 IN6_ADDRLIST_READER_FOREACH(ia) {
2022 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2023 &sa6->sin6_addr) &&
2024 #ifdef SCOPEDROUTING
2025 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
2026 #endif
2027 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2028 pserialize_read_exit(s);
2029 return 1; /* true */
2030 }
2031
2032 /* XXX: do we still have to go thru the rest of the list? */
2033 }
2034 pserialize_read_exit(s);
2035
2036 return 0; /* false */
2037 }
2038
2039 /*
2040 * return length of part which dst and src are equal
2041 * hard coding...
2042 */
2043 int
in6_matchlen(struct in6_addr * src,struct in6_addr * dst)2044 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2045 {
2046 int match = 0;
2047 u_char *s = (u_char *)src, *d = (u_char *)dst;
2048 u_char *lim = s + 16, r;
2049
2050 while (s < lim)
2051 if ((r = (*d++ ^ *s++)) != 0) {
2052 while (r < 128) {
2053 match++;
2054 r <<= 1;
2055 }
2056 break;
2057 } else
2058 match += NBBY;
2059 return match;
2060 }
2061
2062 void
in6_prefixlen2mask(struct in6_addr * maskp,int len)2063 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2064 {
2065 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2066 int bytelen, bitlen, i;
2067
2068 /* sanity check */
2069 if (len < 0 || len > 128) {
2070 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2071 len);
2072 return;
2073 }
2074
2075 memset(maskp, 0, sizeof(*maskp));
2076 bytelen = len / NBBY;
2077 bitlen = len % NBBY;
2078 for (i = 0; i < bytelen; i++)
2079 maskp->s6_addr[i] = 0xff;
2080 if (bitlen)
2081 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2082 }
2083
2084 /*
2085 * return the best address out of the same scope. if no address was
2086 * found, return the first valid address from designated IF.
2087 */
2088 struct in6_ifaddr *
in6_ifawithifp(struct ifnet * ifp,struct in6_addr * dst)2089 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2090 {
2091 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2092 struct ifaddr *ifa;
2093 struct in6_ifaddr *best_ia = NULL, *ia;
2094 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2095
2096 dep[0] = dep[1] = NULL;
2097
2098 /*
2099 * We first look for addresses in the same scope.
2100 * If there is one, return it.
2101 * If two or more, return one which matches the dst longest.
2102 * If none, return one of global addresses assigned other ifs.
2103 */
2104 IFADDR_READER_FOREACH(ifa, ifp) {
2105 if (ifa->ifa_addr->sa_family != AF_INET6)
2106 continue;
2107 ia = (struct in6_ifaddr *)ifa;
2108 if (ia->ia6_flags & IN6_IFF_ANYCAST)
2109 continue; /* XXX: is there any case to allow anycast? */
2110 if (ia->ia6_flags & IN6_IFF_NOTREADY)
2111 continue; /* don't use this interface */
2112 if (ia->ia6_flags & IN6_IFF_DETACHED)
2113 continue;
2114 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2115 if (ip6_use_deprecated)
2116 dep[0] = ia;
2117 continue;
2118 }
2119
2120 if (dst_scope != in6_addrscope(IFA_IN6(ifa)))
2121 continue;
2122 /*
2123 * call in6_matchlen() as few as possible
2124 */
2125 if (best_ia == NULL) {
2126 best_ia = ia;
2127 continue;
2128 }
2129 if (blen == -1)
2130 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst);
2131 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2132 if (tlen > blen) {
2133 blen = tlen;
2134 best_ia = ia;
2135 } else if (tlen == blen)
2136 best_ia = bestia(best_ia, ia);
2137 }
2138 if (best_ia != NULL)
2139 return best_ia;
2140
2141 IFADDR_READER_FOREACH(ifa, ifp) {
2142 if (ifa->ifa_addr->sa_family != AF_INET6)
2143 continue;
2144 ia = (struct in6_ifaddr *)ifa;
2145 if (ia->ia6_flags & IN6_IFF_ANYCAST)
2146 continue; /* XXX: is there any case to allow anycast? */
2147 if (ia->ia6_flags & IN6_IFF_NOTREADY)
2148 continue; /* don't use this interface */
2149 if (ia->ia6_flags & IN6_IFF_DETACHED)
2150 continue;
2151 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2152 if (ip6_use_deprecated)
2153 dep[1] = (struct in6_ifaddr *)ifa;
2154 continue;
2155 }
2156
2157 best_ia = bestia(best_ia, ia);
2158 }
2159 if (best_ia != NULL)
2160 return best_ia;
2161
2162 /* use the last-resort values, that are, deprecated addresses */
2163 if (dep[0])
2164 return dep[0];
2165 if (dep[1])
2166 return dep[1];
2167
2168 return NULL;
2169 }
2170
2171 /*
2172 * perform DAD when interface becomes IFF_UP.
2173 */
2174 void
in6_if_link_up(struct ifnet * ifp)2175 in6_if_link_up(struct ifnet *ifp)
2176 {
2177 struct ifaddr *ifa;
2178 struct in6_ifaddr *ia;
2179 int s, bound;
2180 char ip6buf[INET6_ADDRSTRLEN];
2181
2182 /* Ensure it's sane to run DAD */
2183 if (ifp->if_link_state == LINK_STATE_DOWN)
2184 return;
2185 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
2186 return;
2187
2188 bound = curlwp_bind();
2189 s = pserialize_read_enter();
2190 IFADDR_READER_FOREACH(ifa, ifp) {
2191 struct psref psref;
2192
2193 if (ifa->ifa_addr->sa_family != AF_INET6)
2194 continue;
2195
2196 ifa_acquire(ifa, &psref);
2197 pserialize_read_exit(s);
2198 ia = (struct in6_ifaddr *)ifa;
2199
2200 /* If detached then mark as tentative */
2201 if (ia->ia6_flags & IN6_IFF_DETACHED) {
2202 ia->ia6_flags &= ~IN6_IFF_DETACHED;
2203 if (ip6_dad_enabled() && if_do_dad(ifp)) {
2204 ia->ia6_flags |= IN6_IFF_TENTATIVE;
2205 nd6log(LOG_ERR, "%s marked tentative\n",
2206 IN6_PRINT(ip6buf,
2207 &ia->ia_addr.sin6_addr));
2208 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0)
2209 rt_addrmsg(RTM_NEWADDR, ifa);
2210 }
2211
2212 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2213 int rand_delay;
2214
2215 /* Clear the duplicated flag as we're starting DAD. */
2216 ia->ia6_flags &= ~IN6_IFF_DUPLICATED;
2217
2218 /*
2219 * The TENTATIVE flag was likely set by hand
2220 * beforehand, implicitly indicating the need for DAD.
2221 * We may be able to skip the random delay in this
2222 * case, but we impose delays just in case.
2223 */
2224 rand_delay = cprng_fast32() %
2225 (MAX_RTR_SOLICITATION_DELAY * hz);
2226 /* +1 ensures callout is always used */
2227 nd6_dad_start(ifa, rand_delay + 1);
2228 }
2229
2230 s = pserialize_read_enter();
2231 ifa_release(ifa, &psref);
2232 }
2233 pserialize_read_exit(s);
2234 curlwp_bindx(bound);
2235 }
2236
2237 void
in6_if_up(struct ifnet * ifp)2238 in6_if_up(struct ifnet *ifp)
2239 {
2240
2241 /*
2242 * special cases, like 6to4, are handled in in6_ifattach
2243 */
2244 in6_ifattach(ifp, NULL);
2245
2246 /* interface may not support link state, so bring it up also */
2247 in6_if_link_up(ifp);
2248 }
2249
2250 /*
2251 * Mark all addresses as detached.
2252 */
2253 void
in6_if_link_down(struct ifnet * ifp)2254 in6_if_link_down(struct ifnet *ifp)
2255 {
2256 struct ifaddr *ifa;
2257 struct in6_ifaddr *ia;
2258 int s, bound;
2259 char ip6buf[INET6_ADDRSTRLEN];
2260
2261 bound = curlwp_bind();
2262 s = pserialize_read_enter();
2263 IFADDR_READER_FOREACH(ifa, ifp) {
2264 struct psref psref;
2265
2266 if (ifa->ifa_addr->sa_family != AF_INET6)
2267 continue;
2268
2269 ifa_acquire(ifa, &psref);
2270 pserialize_read_exit(s);
2271 ia = (struct in6_ifaddr *)ifa;
2272
2273 /* Stop DAD processing */
2274 nd6_dad_stop(ifa);
2275
2276 /*
2277 * Mark the address as detached.
2278 * This satisfies RFC4862 Section 5.3, but we should apply
2279 * this logic to all addresses to be a good citizen and
2280 * avoid potential duplicated addresses.
2281 * When the interface comes up again, detached addresses
2282 * are marked tentative and DAD commences.
2283 */
2284 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) {
2285 nd6log(LOG_DEBUG, "%s marked detached\n",
2286 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
2287 ia->ia6_flags |= IN6_IFF_DETACHED;
2288 ia->ia6_flags &=
2289 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED);
2290 rt_addrmsg(RTM_NEWADDR, ifa);
2291 }
2292
2293 s = pserialize_read_enter();
2294 ifa_release(ifa, &psref);
2295 }
2296 pserialize_read_exit(s);
2297 curlwp_bindx(bound);
2298
2299 /* Clear ND6_IFF_IFDISABLED to allow DAD again on link-up. */
2300 if (ifp->if_afdata[AF_INET6] != NULL)
2301 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
2302 }
2303
2304 void
in6_if_down(struct ifnet * ifp)2305 in6_if_down(struct ifnet *ifp)
2306 {
2307
2308 in6_if_link_down(ifp);
2309 lltable_purge_entries(LLTABLE6(ifp));
2310 }
2311
2312 void
in6_if_link_state_change(struct ifnet * ifp,int link_state)2313 in6_if_link_state_change(struct ifnet *ifp, int link_state)
2314 {
2315
2316 /*
2317 * Treat LINK_STATE_UNKNOWN as UP.
2318 * LINK_STATE_UNKNOWN transitions to LINK_STATE_DOWN when
2319 * if_link_state_change() transitions to LINK_STATE_UP.
2320 */
2321 if (link_state == LINK_STATE_DOWN)
2322 in6_if_link_down(ifp);
2323 else
2324 in6_if_link_up(ifp);
2325 }
2326
2327 int
in6_tunnel_validate(const struct ip6_hdr * ip6,const struct in6_addr * src,const struct in6_addr * dst)2328 in6_tunnel_validate(const struct ip6_hdr *ip6, const struct in6_addr *src,
2329 const struct in6_addr *dst)
2330 {
2331
2332 /* check for address match */
2333 if (!IN6_ARE_ADDR_EQUAL(src, &ip6->ip6_dst) ||
2334 !IN6_ARE_ADDR_EQUAL(dst, &ip6->ip6_src))
2335 return 0;
2336
2337 /* martian filters on outer source - done in ip6_input */
2338
2339 /* NOTE: the packet may be dropped by uRPF. */
2340
2341 /* return valid bytes length */
2342 return sizeof(*src) + sizeof(*dst);
2343 }
2344
2345 #define IN6_LLTBL_DEFAULT_HSIZE 32
2346 #define IN6_LLTBL_HASH(k, h) \
2347 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2348
2349 /*
2350 * Do actual deallocation of @lle.
2351 * Called by LLE_FREE_LOCKED when number of references
2352 * drops to zero.
2353 */
2354 static void
in6_lltable_destroy_lle(struct llentry * lle)2355 in6_lltable_destroy_lle(struct llentry *lle)
2356 {
2357
2358 KASSERTMSG(lle->la_numheld == 0, "la_numheld=%d", lle->la_numheld);
2359
2360 LLE_WUNLOCK(lle);
2361 LLE_LOCK_DESTROY(lle);
2362 llentry_pool_put(lle);
2363 }
2364
2365 static struct llentry *
in6_lltable_new(const struct in6_addr * addr6,u_int flags)2366 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2367 {
2368 struct llentry *lle;
2369
2370 lle = llentry_pool_get(PR_NOWAIT);
2371 if (lle == NULL) /* NB: caller generates msg */
2372 return NULL;
2373
2374 lle->r_l3addr.addr6 = *addr6;
2375 lle->lle_refcnt = 1;
2376 lle->lle_free = in6_lltable_destroy_lle;
2377 LLE_LOCK_INIT(lle);
2378 callout_init(&lle->lle_timer, CALLOUT_MPSAFE);
2379
2380 return lle;
2381 }
2382
2383 static int
in6_lltable_match_prefix(const struct sockaddr * prefix,const struct sockaddr * mask,u_int flags,struct llentry * lle)2384 in6_lltable_match_prefix(const struct sockaddr *prefix,
2385 const struct sockaddr *mask, u_int flags, struct llentry *lle)
2386 {
2387 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2388 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2389
2390 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6,
2391 &pfx->sin6_addr, &msk->sin6_addr) &&
2392 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)))
2393 return 1;
2394
2395 return 0;
2396 }
2397
2398 static void
in6_lltable_free_entry(struct lltable * llt,struct llentry * lle)2399 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2400 {
2401
2402 LLE_WLOCK_ASSERT(lle);
2403 (void) llentry_free(lle);
2404 }
2405
2406 static int
in6_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr,const struct rtentry * rt)2407 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags,
2408 const struct sockaddr *l3addr, const struct rtentry *rt)
2409 {
2410 char ip6buf[INET6_ADDRSTRLEN];
2411
2412 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2413 int s;
2414 struct ifaddr *ifa;
2415 /*
2416 * Create an ND6 cache for an IPv6 neighbor
2417 * that is not covered by our own prefix.
2418 */
2419 /* XXX ifaof_ifpforaddr should take a const param */
2420 s = pserialize_read_enter();
2421 ifa = ifaof_ifpforaddr(l3addr, ifp);
2422 if (ifa != NULL) {
2423 pserialize_read_exit(s);
2424 return 0;
2425 }
2426 pserialize_read_exit(s);
2427 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2428 IN6_PRINT(ip6buf,
2429 &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2430 return EINVAL;
2431 }
2432 return 0;
2433 }
2434
2435 static inline uint32_t
in6_lltable_hash_dst(const struct in6_addr * dst,uint32_t hsize)2436 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2437 {
2438
2439 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize);
2440 }
2441
2442 static uint32_t
in6_lltable_hash(const struct llentry * lle,uint32_t hsize)2443 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2444 {
2445
2446 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize);
2447 }
2448
2449 static void
in6_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)2450 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2451 {
2452 struct sockaddr_in6 *sin6;
2453
2454 sin6 = (struct sockaddr_in6 *)sa;
2455 bzero(sin6, sizeof(*sin6));
2456 sin6->sin6_family = AF_INET6;
2457 sin6->sin6_len = sizeof(*sin6);
2458 sin6->sin6_addr = lle->r_l3addr.addr6;
2459 }
2460
2461 static inline struct llentry *
in6_lltable_find_dst(struct lltable * llt,const struct in6_addr * dst)2462 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2463 {
2464 struct llentry *lle;
2465 struct llentries *lleh;
2466 u_int hashidx;
2467
2468 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2469 lleh = &llt->lle_head[hashidx];
2470 LIST_FOREACH(lle, lleh, lle_next) {
2471 if (lle->la_flags & LLE_DELETED)
2472 continue;
2473 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2474 break;
2475 }
2476
2477 return lle;
2478 }
2479
2480 static int
in6_lltable_delete(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2481 in6_lltable_delete(struct lltable *llt, u_int flags,
2482 const struct sockaddr *l3addr)
2483 {
2484 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2485 struct llentry *lle;
2486
2487 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
2488 KASSERTMSG(l3addr->sa_family == AF_INET6,
2489 "sin_family %d", l3addr->sa_family);
2490
2491 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2492
2493 if (lle == NULL) {
2494 #ifdef LLTABLE_DEBUG
2495 char buf[64];
2496 sockaddr_format(l3addr, buf, sizeof(buf));
2497 log(LOG_INFO, "%s: cache for %s is not found\n",
2498 __func__, buf);
2499 #endif
2500 return ENOENT;
2501 }
2502
2503 LLE_WLOCK(lle);
2504 #ifdef LLTABLE_DEBUG
2505 {
2506 char buf[64];
2507 sockaddr_format(l3addr, buf, sizeof(buf));
2508 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n",
2509 __func__, buf, lle);
2510 }
2511 #endif
2512 llentry_free(lle);
2513
2514 return 0;
2515 }
2516
2517 static struct llentry *
in6_lltable_create(struct lltable * llt,u_int flags,const struct sockaddr * l3addr,const struct rtentry * rt)2518 in6_lltable_create(struct lltable *llt, u_int flags,
2519 const struct sockaddr *l3addr, const struct rtentry *rt)
2520 {
2521 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2522 struct ifnet *ifp = llt->llt_ifp;
2523 struct llentry *lle;
2524
2525 IF_AFDATA_WLOCK_ASSERT(ifp);
2526 KASSERTMSG(l3addr->sa_family == AF_INET6,
2527 "sin_family %d", l3addr->sa_family);
2528
2529 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2530
2531 if (lle != NULL) {
2532 LLE_WLOCK(lle);
2533 return lle;
2534 }
2535
2536 /*
2537 * A route that covers the given address must have
2538 * been installed 1st because we are doing a resolution,
2539 * verify this.
2540 */
2541 if (!(flags & LLE_IFADDR) &&
2542 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0)
2543 return NULL;
2544
2545 lle = in6_lltable_new(&sin6->sin6_addr, flags);
2546 if (lle == NULL) {
2547 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2548 return NULL;
2549 }
2550 lle->la_flags = flags;
2551 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2552 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen);
2553 lle->la_flags |= LLE_VALID;
2554 }
2555
2556 lltable_link_entry(llt, lle);
2557 LLE_WLOCK(lle);
2558
2559 return lle;
2560 }
2561
2562 static struct llentry *
in6_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2563 in6_lltable_lookup(struct lltable *llt, u_int flags,
2564 const struct sockaddr *l3addr)
2565 {
2566 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2567 struct llentry *lle;
2568
2569 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2570 KASSERTMSG(l3addr->sa_family == AF_INET6,
2571 "sin_family %d", l3addr->sa_family);
2572
2573 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2574
2575 if (lle == NULL)
2576 return NULL;
2577
2578 if (flags & LLE_EXCLUSIVE)
2579 LLE_WLOCK(lle);
2580 else
2581 LLE_RLOCK(lle);
2582 return lle;
2583 }
2584
2585 static int
in6_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct rt_walkarg * w)2586 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2587 struct rt_walkarg *w)
2588 {
2589 struct sockaddr_in6 sin6;
2590
2591 LLTABLE_LOCK_ASSERT();
2592
2593 /* skip deleted entries */
2594 if (lle->la_flags & LLE_DELETED)
2595 return 0;
2596
2597 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0);
2598
2599 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6));
2600 }
2601
2602 static struct lltable *
in6_lltattach(struct ifnet * ifp)2603 in6_lltattach(struct ifnet *ifp)
2604 {
2605 struct lltable *llt;
2606
2607 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2608 llt->llt_af = AF_INET6;
2609 llt->llt_ifp = ifp;
2610
2611 llt->llt_lookup = in6_lltable_lookup;
2612 llt->llt_create = in6_lltable_create;
2613 llt->llt_delete = in6_lltable_delete;
2614 llt->llt_dump_entry = in6_lltable_dump_entry;
2615 llt->llt_hash = in6_lltable_hash;
2616 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2617 llt->llt_free_entry = in6_lltable_free_entry;
2618 llt->llt_match_prefix = in6_lltable_match_prefix;
2619 lltable_link(llt);
2620
2621 return llt;
2622 }
2623
2624 void *
in6_domifattach(struct ifnet * ifp)2625 in6_domifattach(struct ifnet *ifp)
2626 {
2627 struct in6_ifextra *ext;
2628
2629 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO);
2630
2631 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat),
2632 M_IFADDR, M_WAITOK|M_ZERO);
2633
2634 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat),
2635 M_IFADDR, M_WAITOK|M_ZERO);
2636
2637 ext->nd_ifinfo = nd6_ifattach(ifp);
2638 ext->scope6_id = scope6_ifattach(ifp);
2639 ext->lltable = in6_lltattach(ifp);
2640
2641 return ext;
2642 }
2643
2644 void
in6_domifdetach(struct ifnet * ifp,void * aux)2645 in6_domifdetach(struct ifnet *ifp, void *aux)
2646 {
2647 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2648
2649 lltable_free(ext->lltable);
2650 ext->lltable = NULL;
2651 SOFTNET_LOCK_UNLESS_NET_MPSAFE();
2652 nd6_ifdetach(ifp, ext);
2653 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE();
2654 free(ext->in6_ifstat, M_IFADDR);
2655 free(ext->icmp6_ifstat, M_IFADDR);
2656 scope6_ifdetach(ext->scope6_id);
2657 free(ext, M_IFADDR);
2658 }
2659
2660 /*
2661 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address
2662 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2.
2663 */
2664 void
in6_in_2_v4mapin6(const struct in_addr * in,struct in6_addr * in6)2665 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6)
2666 {
2667 in6->s6_addr32[0] = 0;
2668 in6->s6_addr32[1] = 0;
2669 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2670 in6->s6_addr32[3] = in->s_addr;
2671 }
2672
2673 /*
2674 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2675 * v4 mapped addr or v4 compat addr
2676 */
2677 void
in6_sin6_2_sin(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2678 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2679 {
2680 memset(sin, 0, sizeof(*sin));
2681 sin->sin_len = sizeof(struct sockaddr_in);
2682 sin->sin_family = AF_INET;
2683 sin->sin_port = sin6->sin6_port;
2684 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2685 }
2686
2687 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2688 void
in6_sin_2_v4mapsin6(const struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2689 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2690 {
2691 memset(sin6, 0, sizeof(*sin6));
2692 sin6->sin6_len = sizeof(struct sockaddr_in6);
2693 sin6->sin6_family = AF_INET6;
2694 sin6->sin6_port = sin->sin_port;
2695 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr);
2696 }
2697
2698 /* Convert sockaddr_in6 into sockaddr_in. */
2699 void
in6_sin6_2_sin_in_sock(struct sockaddr * nam)2700 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2701 {
2702 struct sockaddr_in *sin_p;
2703 struct sockaddr_in6 sin6;
2704
2705 /*
2706 * Save original sockaddr_in6 addr and convert it
2707 * to sockaddr_in.
2708 */
2709 sin6 = *(struct sockaddr_in6 *)nam;
2710 sin_p = (struct sockaddr_in *)nam;
2711 in6_sin6_2_sin(sin_p, &sin6);
2712 }
2713
2714 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2715 void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr ** nam)2716 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2717 {
2718 struct sockaddr_in *sin_p;
2719 struct sockaddr_in6 *sin6_p;
2720
2721 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK);
2722 sin_p = (struct sockaddr_in *)*nam;
2723 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2724 free(*nam, M_SONAME);
2725 *nam = sin6tosa(sin6_p);
2726 }
2727