1 /* $NetBSD: in6.c,v 1.288 2022/10/24 14:15:19 msaitoh 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 1.288 2022/10/24 14:15:19 msaitoh 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 #ifdef COMPAT_50
109 #include <compat/netinet6/in6_var.h>
110 #endif
111 #ifdef COMPAT_90
112 #include <compat/netinet6/in6_var.h>
113 #include <compat/netinet6/nd6.h>
114 #endif
115
116 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options");
117
118 /* enable backward compatibility code for obsoleted ioctls */
119 #define COMPAT_IN6IFIOCTL
120
121 #ifdef IN6_DEBUG
122 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__)
123 #else
124 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0)
125 #endif /* IN6_DEBUG */
126
127 /*
128 * Definitions of some constant IP6 addresses.
129 */
130 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
131 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
132 const struct in6_addr in6addr_nodelocal_allnodes =
133 IN6ADDR_NODELOCAL_ALLNODES_INIT;
134 const struct in6_addr in6addr_linklocal_allnodes =
135 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
136 const struct in6_addr in6addr_linklocal_allrouters =
137 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
138
139 const struct in6_addr in6mask0 = IN6MASK0;
140 const struct in6_addr in6mask32 = IN6MASK32;
141 const struct in6_addr in6mask64 = IN6MASK64;
142 const struct in6_addr in6mask96 = IN6MASK96;
143 const struct in6_addr in6mask128 = IN6MASK128;
144
145 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
146 0, 0, IN6ADDR_ANY_INIT, 0};
147
148 struct pslist_head in6_ifaddr_list;
149 kmutex_t in6_ifaddr_lock;
150
151 static int in6_lifaddr_ioctl(struct socket *, u_long, void *,
152 struct ifnet *);
153 static int in6_ifaddprefix(struct in6_ifaddr *);
154 static int in6_ifremprefix(struct in6_ifaddr *);
155 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *,
156 const struct sockaddr_in6 *, int);
157 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
158 static int in6_update_ifa1(struct ifnet *, struct in6_aliasreq *,
159 struct in6_ifaddr **, struct psref *, int);
160
161 void
in6_init(void)162 in6_init(void)
163 {
164
165 PSLIST_INIT(&in6_ifaddr_list);
166 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE);
167
168 in6_sysctl_multicast_setup(NULL);
169 }
170
171 /*
172 * Add ownaddr as loopback rtentry. We previously add the route only if
173 * necessary (ex. on a p2p link). However, since we now manage addresses
174 * separately from prefixes, we should always add the route. We can't
175 * rely on the cloning mechanism from the corresponding interface route
176 * any more.
177 */
178 void
in6_ifaddlocal(struct ifaddr * ifa)179 in6_ifaddlocal(struct ifaddr *ifa)
180 {
181
182 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) ||
183 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT &&
184 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa))))
185 {
186 rt_addrmsg(RTM_NEWADDR, ifa);
187 return;
188 }
189
190 rt_ifa_addlocal(ifa);
191 }
192
193 /*
194 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(),
195 * if it exists.
196 */
197 void
in6_ifremlocal(struct ifaddr * ifa)198 in6_ifremlocal(struct ifaddr *ifa)
199 {
200 struct in6_ifaddr *ia;
201 struct ifaddr *alt_ifa = NULL;
202 int ia_count = 0;
203 struct psref psref;
204 int s;
205
206 /*
207 * Some of BSD variants do not remove cloned routes
208 * from an interface direct route, when removing the direct route
209 * (see comments in net/net_osdep.h). Even for variants that do remove
210 * cloned routes, they could fail to remove the cloned routes when
211 * we handle multiple addresses that share a common prefix.
212 * So, we should remove the route corresponding to the deleted address.
213 */
214
215 /*
216 * Delete the entry only if exactly one ifaddr matches the
217 * address, ifa->ifa_addr.
218 *
219 * If more than one ifaddr matches, replace the ifaddr in
220 * the routing table, rt_ifa, with a different ifaddr than
221 * the one we are purging, ifa. It is important to do
222 * this, or else the routing table can accumulate dangling
223 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces,
224 * which will lead to crashes, later. (More than one ifaddr
225 * can match if we assign the same address to multiple---probably
226 * p2p---interfaces.)
227 *
228 * XXX An old comment at this place said, "we should avoid
229 * XXX such a configuration [i.e., interfaces with the same
230 * XXX addressed assigned --ed.] in IPv6...". I do not
231 * XXX agree, especially now that I have fixed the dangling
232 * XXX ifp-pointers bug.
233 */
234 s = pserialize_read_enter();
235 IN6_ADDRLIST_READER_FOREACH(ia) {
236 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr))
237 continue;
238 if (ia->ia_ifp != ifa->ifa_ifp)
239 alt_ifa = &ia->ia_ifa;
240 if (++ia_count > 1 && alt_ifa != NULL)
241 break;
242 }
243 if (ia_count > 1 && alt_ifa != NULL)
244 ifa_acquire(alt_ifa, &psref);
245 pserialize_read_exit(s);
246
247 if (ia_count == 0)
248 return;
249
250 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa);
251
252 if (ia_count > 1 && alt_ifa != NULL)
253 ifa_release(alt_ifa, &psref);
254 }
255
256 /* Add prefix route for the network. */
257 static int
in6_ifaddprefix(struct in6_ifaddr * ia)258 in6_ifaddprefix(struct in6_ifaddr *ia)
259 {
260 int error, flags = 0;
261
262 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) {
263 if (ia->ia_dstaddr.sin6_family != AF_INET6)
264 /* We don't need to install a host route. */
265 return 0;
266 flags |= RTF_HOST;
267 }
268
269 /* Is this a connected route for neighbour discovery? */
270 if (nd6_need_cache(ia->ia_ifp))
271 flags |= RTF_CONNECTED;
272
273 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0)
274 ia->ia_flags |= IFA_ROUTE;
275 else if (error == EEXIST)
276 /* Existence of the route is not an error. */
277 error = 0;
278
279 return error;
280 }
281
282 static int
in6_rt_ifa_matcher(struct rtentry * rt,void * v)283 in6_rt_ifa_matcher(struct rtentry *rt, void *v)
284 {
285 struct ifaddr *ifa = v;
286
287 if (rt->rt_ifa == ifa)
288 return 1;
289 else
290 return 0;
291 }
292
293 /* Delete network prefix route if present.
294 * Re-add it to another address if the prefix matches. */
295 static int
in6_ifremprefix(struct in6_ifaddr * target)296 in6_ifremprefix(struct in6_ifaddr *target)
297 {
298 int error, s;
299 struct in6_ifaddr *ia;
300
301 if ((target->ia_flags & IFA_ROUTE) == 0)
302 return 0;
303
304 s = pserialize_read_enter();
305 IN6_ADDRLIST_READER_FOREACH(ia) {
306 if (target->ia_dstaddr.sin6_len) {
307 if (ia->ia_dstaddr.sin6_len == 0 ||
308 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr,
309 &target->ia_dstaddr.sin6_addr))
310 continue;
311 } else {
312 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
313 &target->ia_addr.sin6_addr,
314 &target->ia_prefixmask.sin6_addr))
315 continue;
316 }
317
318 /*
319 * if we got a matching prefix route, move IFA_ROUTE to him
320 */
321 if ((ia->ia_flags & IFA_ROUTE) == 0) {
322 struct psref psref;
323 int bound = curlwp_bind();
324
325 ia6_acquire(ia, &psref);
326 pserialize_read_exit(s);
327
328 rtinit(&target->ia_ifa, RTM_DELETE, 0);
329 target->ia_flags &= ~IFA_ROUTE;
330
331 error = in6_ifaddprefix(ia);
332
333 if (!ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING))
334 goto skip;
335 /*
336 * Replace rt_ifa of routes that have the removing address
337 * with the new address.
338 */
339 rt_replace_ifa_matched_entries(AF_INET6,
340 in6_rt_ifa_matcher, &target->ia_ifa, &ia->ia_ifa);
341
342 skip:
343 ia6_release(ia, &psref);
344 curlwp_bindx(bound);
345
346 return error;
347 }
348 }
349 pserialize_read_exit(s);
350
351 /*
352 * noone seem to have prefix route. remove it.
353 */
354 rtinit(&target->ia_ifa, RTM_DELETE, 0);
355 target->ia_flags &= ~IFA_ROUTE;
356
357 if (ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING)) {
358 /* Remove routes that have the removing address as rt_ifa. */
359 rt_delete_matched_entries(AF_INET6, in6_rt_ifa_matcher,
360 &target->ia_ifa, true);
361 }
362
363 return 0;
364 }
365
366 int
in6_mask2len(struct in6_addr * mask,u_char * lim0)367 in6_mask2len(struct in6_addr *mask, u_char *lim0)
368 {
369 int x = 0, y;
370 u_char *lim = lim0, *p;
371
372 /* ignore the scope_id part */
373 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
374 lim = (u_char *)mask + sizeof(*mask);
375 for (p = (u_char *)mask; p < lim; x++, p++) {
376 if (*p != 0xff)
377 break;
378 }
379 y = 0;
380 if (p < lim) {
381 for (y = 0; y < NBBY; y++) {
382 if ((*p & (0x80 >> y)) == 0)
383 break;
384 }
385 }
386
387 /*
388 * when the limit pointer is given, do a stricter check on the
389 * remaining bits.
390 */
391 if (p < lim) {
392 if (y != 0 && (*p & (0x00ff >> y)) != 0)
393 return -1;
394 for (p = p + 1; p < lim; p++)
395 if (*p != 0)
396 return -1;
397 }
398
399 return x * NBBY + y;
400 }
401
402 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
403 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
404
405 static int
in6_control1(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)406 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
407 {
408 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
409 struct in6_ifaddr *ia = NULL;
410 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
411 struct sockaddr_in6 *sa6;
412 int error, bound;
413 struct psref psref;
414
415 switch (cmd) {
416 case SIOCAADDRCTL_POLICY:
417 case SIOCDADDRCTL_POLICY:
418 /* Privileged. */
419 return in6_src_ioctl(cmd, data);
420 /*
421 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc.
422 */
423 case SIOCSIFADDR:
424 case SIOCSIFDSTADDR:
425 case SIOCSIFBRDADDR:
426 case SIOCSIFNETMASK:
427 return EOPNOTSUPP;
428 case SIOCGETSGCNT_IN6:
429 case SIOCGETMIFCNT_IN6:
430 return mrt6_ioctl(cmd, data);
431 case SIOCGIFADDRPREF:
432 case SIOCSIFADDRPREF:
433 if (ifp == NULL)
434 return EINVAL;
435 return ifaddrpref_ioctl(so, cmd, data, ifp);
436 }
437
438 if (ifp == NULL)
439 return EOPNOTSUPP;
440
441 switch (cmd) {
442 #ifdef OSIOCSIFINFO_IN6_90
443 case OSIOCSIFINFO_FLAGS_90:
444 case OSIOCSIFINFO_IN6_90:
445 case OSIOCSDEFIFACE_IN6:
446 case OSIOCSNDFLUSH_IN6:
447 case OSIOCSPFXFLUSH_IN6:
448 case OSIOCSRTRFLUSH_IN6:
449 #endif
450 case SIOCSIFINFO_FLAGS:
451 case SIOCSIFINFO_IN6:
452 /* Privileged. */
453 /* FALLTHROUGH */
454 #ifdef OSIOCGIFINFO_IN6
455 case OSIOCGIFINFO_IN6:
456 #endif
457 #ifdef OSIOCGIFINFO_IN6_90
458 case OSIOCGDRLST_IN6:
459 case OSIOCGPRLST_IN6:
460 case OSIOCGIFINFO_IN6_90:
461 case OSIOCGDEFIFACE_IN6:
462 #endif
463 case SIOCGIFINFO_IN6:
464 case SIOCGNBRINFO_IN6:
465 return nd6_ioctl(cmd, data, ifp);
466 }
467
468 switch (cmd) {
469 case SIOCALIFADDR:
470 case SIOCDLIFADDR:
471 /* Privileged. */
472 /* FALLTHROUGH */
473 case SIOCGLIFADDR:
474 return in6_lifaddr_ioctl(so, cmd, data, ifp);
475 }
476
477 /*
478 * Find address for this interface, if it exists.
479 *
480 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
481 * only, and used the first interface address as the target of other
482 * operations (without checking ifra_addr). This was because netinet
483 * code/API assumed at most 1 interface address per interface.
484 * Since IPv6 allows a node to assign multiple addresses
485 * on a single interface, we almost always look and check the
486 * presence of ifra_addr, and reject invalid ones here.
487 * It also decreases duplicated code among SIOC*_IN6 operations.
488 */
489 switch (cmd) {
490 case SIOCAIFADDR_IN6:
491 #ifdef OSIOCAIFADDR_IN6
492 case OSIOCAIFADDR_IN6:
493 #endif
494 #ifdef OSIOCSIFPHYADDR_IN6
495 case OSIOCSIFPHYADDR_IN6:
496 #endif
497 case SIOCSIFPHYADDR_IN6:
498 sa6 = &ifra->ifra_addr;
499 break;
500 case SIOCSIFADDR_IN6:
501 case SIOCGIFADDR_IN6:
502 case SIOCSIFDSTADDR_IN6:
503 case SIOCSIFNETMASK_IN6:
504 case SIOCGIFDSTADDR_IN6:
505 case SIOCGIFNETMASK_IN6:
506 case SIOCDIFADDR_IN6:
507 case SIOCGIFPSRCADDR_IN6:
508 case SIOCGIFPDSTADDR_IN6:
509 case SIOCGIFAFLAG_IN6:
510 case SIOCGIFALIFETIME_IN6:
511 #ifdef OSIOCGIFALIFETIME_IN6
512 case OSIOCGIFALIFETIME_IN6:
513 #endif
514 case SIOCGIFSTAT_IN6:
515 case SIOCGIFSTAT_ICMP6:
516 sa6 = &ifr->ifr_addr;
517 break;
518 default:
519 sa6 = NULL;
520 break;
521 }
522
523 error = 0;
524 bound = curlwp_bind();
525 if (sa6 && sa6->sin6_family == AF_INET6) {
526 if (sa6->sin6_scope_id != 0)
527 error = sa6_embedscope(sa6, 0);
528 else
529 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
530 if (error != 0)
531 goto out;
532 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref);
533 } else
534 ia = NULL;
535
536 switch (cmd) {
537 case SIOCSIFADDR_IN6:
538 case SIOCSIFDSTADDR_IN6:
539 case SIOCSIFNETMASK_IN6:
540 /*
541 * Since IPv6 allows a node to assign multiple addresses
542 * on a single interface, SIOCSIFxxx ioctls are deprecated.
543 */
544 error = EINVAL;
545 goto release;
546
547 case SIOCDIFADDR_IN6:
548 /*
549 * for IPv4, we look for existing in_ifaddr here to allow
550 * "ifconfig if0 delete" to remove the first IPv4 address on
551 * the interface. For IPv6, as the spec allows multiple
552 * interface address from the day one, we consider "remove the
553 * first one" semantics to be not preferable.
554 */
555 if (ia == NULL) {
556 error = EADDRNOTAVAIL;
557 goto out;
558 }
559 #ifdef OSIOCAIFADDR_IN6
560 /* FALLTHROUGH */
561 case OSIOCAIFADDR_IN6:
562 #endif
563 /* FALLTHROUGH */
564 case SIOCAIFADDR_IN6:
565 /*
566 * We always require users to specify a valid IPv6 address for
567 * the corresponding operation.
568 */
569 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
570 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
571 error = EAFNOSUPPORT;
572 goto release;
573 }
574 /* Privileged. */
575
576 break;
577
578 case SIOCGIFADDR_IN6:
579 /* This interface is basically deprecated. use SIOCGIFCONF. */
580 /* FALLTHROUGH */
581 case SIOCGIFAFLAG_IN6:
582 case SIOCGIFNETMASK_IN6:
583 case SIOCGIFDSTADDR_IN6:
584 case SIOCGIFALIFETIME_IN6:
585 #ifdef OSIOCGIFALIFETIME_IN6
586 case OSIOCGIFALIFETIME_IN6:
587 #endif
588 /* must think again about its semantics */
589 if (ia == NULL) {
590 error = EADDRNOTAVAIL;
591 goto out;
592 }
593 break;
594 }
595
596 switch (cmd) {
597
598 case SIOCGIFADDR_IN6:
599 ifr->ifr_addr = ia->ia_addr;
600 error = sa6_recoverscope(&ifr->ifr_addr);
601 break;
602
603 case SIOCGIFDSTADDR_IN6:
604 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
605 error = EINVAL;
606 break;
607 }
608 /*
609 * XXX: should we check if ifa_dstaddr is NULL and return
610 * an error?
611 */
612 ifr->ifr_dstaddr = ia->ia_dstaddr;
613 error = sa6_recoverscope(&ifr->ifr_dstaddr);
614 break;
615
616 case SIOCGIFNETMASK_IN6:
617 ifr->ifr_addr = ia->ia_prefixmask;
618 break;
619
620 case SIOCGIFAFLAG_IN6:
621 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
622 break;
623
624 case SIOCGIFSTAT_IN6:
625 if (ifp == NULL) {
626 error = EINVAL;
627 break;
628 }
629 memset(&ifr->ifr_ifru.ifru_stat, 0,
630 sizeof(ifr->ifr_ifru.ifru_stat));
631 ifr->ifr_ifru.ifru_stat =
632 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
633 break;
634
635 case SIOCGIFSTAT_ICMP6:
636 if (ifp == NULL) {
637 error = EINVAL;
638 break;
639 }
640 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0,
641 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
642 ifr->ifr_ifru.ifru_icmp6stat =
643 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
644 break;
645
646 #ifdef OSIOCGIFALIFETIME_IN6
647 case OSIOCGIFALIFETIME_IN6:
648 #endif
649 case SIOCGIFALIFETIME_IN6:
650 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
651 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
652 time_t maxexpire;
653 struct in6_addrlifetime *retlt =
654 &ifr->ifr_ifru.ifru_lifetime;
655
656 /*
657 * XXX: adjust expiration time assuming time_t is
658 * signed.
659 */
660 maxexpire = ((time_t)~0) &
661 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1));
662 if (ia->ia6_lifetime.ia6t_vltime <
663 maxexpire - ia->ia6_updatetime) {
664 retlt->ia6t_expire = ia->ia6_updatetime +
665 ia->ia6_lifetime.ia6t_vltime;
666 retlt->ia6t_expire = retlt->ia6t_expire ?
667 time_mono_to_wall(retlt->ia6t_expire) :
668 0;
669 } else
670 retlt->ia6t_expire = maxexpire;
671 }
672 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
673 time_t maxexpire;
674 struct in6_addrlifetime *retlt =
675 &ifr->ifr_ifru.ifru_lifetime;
676
677 /*
678 * XXX: adjust expiration time assuming time_t is
679 * signed.
680 */
681 maxexpire = ((time_t)~0) &
682 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1));
683 if (ia->ia6_lifetime.ia6t_pltime <
684 maxexpire - ia->ia6_updatetime) {
685 retlt->ia6t_preferred = ia->ia6_updatetime +
686 ia->ia6_lifetime.ia6t_pltime;
687 retlt->ia6t_preferred = retlt->ia6t_preferred ?
688 time_mono_to_wall(retlt->ia6t_preferred) :
689 0;
690 } else
691 retlt->ia6t_preferred = maxexpire;
692 }
693 #ifdef OSIOCFIFALIFETIME_IN6
694 if (cmd == OSIOCFIFALIFETIME_IN6)
695 in6_addrlifetime_to_in6_addrlifetime50(
696 &ifr->ifru.ifru_lifetime);
697 #endif
698 break;
699
700 #ifdef OSIOCAIFADDR_IN6
701 case OSIOCAIFADDR_IN6:
702 in6_aliasreq50_to_in6_aliasreq(ifra);
703 #endif
704 /*FALLTHROUGH*/
705 case SIOCAIFADDR_IN6:
706 {
707 struct in6_addrlifetime *lt;
708
709 /* reject read-only flags */
710 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 ||
711 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 ||
712 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 ||
713 (ifra->ifra_flags & IN6_IFF_NODAD) != 0) {
714 error = EINVAL;
715 break;
716 }
717 /*
718 * ia6t_expire and ia6t_preferred won't be used for now,
719 * so just in case.
720 */
721 lt = &ifra->ifra_lifetime;
722 if (lt->ia6t_expire != 0)
723 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire);
724 if (lt->ia6t_preferred != 0)
725 lt->ia6t_preferred =
726 time_wall_to_mono(lt->ia6t_preferred);
727 /*
728 * make (ia == NULL) or update (ia != NULL) the interface
729 * address structure, and link it to the list.
730 */
731 int s = splsoftnet();
732 error = in6_update_ifa1(ifp, ifra, &ia, &psref, 0);
733 splx(s);
734 if (error)
735 break;
736 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
737 break;
738 }
739
740 case SIOCDIFADDR_IN6:
741 ia6_release(ia, &psref);
742 ifaref(&ia->ia_ifa);
743 in6_purgeaddr(&ia->ia_ifa);
744 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
745 ifafree(&ia->ia_ifa);
746 ia = NULL;
747 break;
748
749 default:
750 error = ENOTTY;
751 }
752 release:
753 ia6_release(ia, &psref);
754 out:
755 curlwp_bindx(bound);
756 return error;
757 }
758
759 int
in6_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)760 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
761 {
762 int error, s;
763
764 switch (cmd) {
765 #ifdef OSIOCSIFINFO_IN6_90
766 case OSIOCSIFINFO_FLAGS_90:
767 case OSIOCSIFINFO_IN6_90:
768 case OSIOCSDEFIFACE_IN6:
769 case OSIOCSNDFLUSH_IN6:
770 case OSIOCSPFXFLUSH_IN6:
771 case OSIOCSRTRFLUSH_IN6:
772 #endif
773 case SIOCSIFINFO_FLAGS:
774 case SIOCSIFINFO_IN6:
775
776 case SIOCALIFADDR:
777 case SIOCDLIFADDR:
778
779 case SIOCDIFADDR_IN6:
780 #ifdef OSIOCAIFADDR_IN6
781 case OSIOCAIFADDR_IN6:
782 #endif
783 case SIOCAIFADDR_IN6:
784
785 case SIOCAADDRCTL_POLICY:
786 case SIOCDADDRCTL_POLICY:
787
788 if (kauth_authorize_network(kauth_cred_get(),
789 KAUTH_NETWORK_SOCKET,
790 KAUTH_REQ_NETWORK_SOCKET_SETPRIV,
791 so, NULL, NULL))
792 return EPERM;
793 break;
794 }
795
796 s = splsoftnet();
797 #ifndef NET_MPSAFE
798 KASSERT(KERNEL_LOCKED_P());
799 #endif
800 error = in6_control1(so , cmd, data, ifp);
801 splx(s);
802 return error;
803 }
804
805 static int
in6_get_llsol_addr(struct in6_addr * llsol,struct ifnet * ifp,struct in6_addr * ip6)806 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp,
807 struct in6_addr *ip6)
808 {
809 int error;
810
811 memset(llsol, 0, sizeof(struct in6_addr));
812 llsol->s6_addr16[0] = htons(0xff02);
813 llsol->s6_addr32[1] = 0;
814 llsol->s6_addr32[2] = htonl(1);
815 llsol->s6_addr32[3] = ip6->s6_addr32[3];
816 llsol->s6_addr8[12] = 0xff;
817
818 error = in6_setscope(llsol, ifp, NULL);
819 if (error != 0) {
820 /* XXX: should not happen */
821 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
822 }
823
824 return error;
825 }
826
827 static int
in6_join_mcastgroups(struct in6_aliasreq * ifra,struct in6_ifaddr * ia,struct ifnet * ifp,int flags)828 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia,
829 struct ifnet *ifp, int flags)
830 {
831 int error;
832 struct sockaddr_in6 mltaddr, mltmask;
833 struct in6_multi_mship *imm;
834 struct in6_addr llsol;
835 struct rtentry *rt;
836 int dad_delay;
837 char ip6buf[INET6_ADDRSTRLEN];
838
839 /* join solicited multicast addr for new host id */
840 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr);
841 if (error != 0)
842 goto out;
843 dad_delay = 0;
844 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
845 /*
846 * We need a random delay for DAD on the address
847 * being configured. It also means delaying
848 * transmission of the corresponding MLD report to
849 * avoid report collision.
850 * [draft-ietf-ipv6-rfc2462bis-02.txt]
851 */
852 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz);
853 }
854
855 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */
856 /* join solicited multicast addr for new host id */
857 imm = in6_joingroup(ifp, &llsol, &error, dad_delay);
858 if (!imm) {
859 nd6log(LOG_ERR,
860 "addmulti failed for %s on %s (errno=%d)\n",
861 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error);
862 goto out;
863 }
864 mutex_enter(&in6_ifaddr_lock);
865 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
866 mutex_exit(&in6_ifaddr_lock);
867
868 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0);
869
870 /*
871 * join link-local all-nodes address
872 */
873 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes,
874 0, 0, 0);
875 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
876 goto out; /* XXX: should not fail */
877
878 /*
879 * XXX: do we really need this automatic routes?
880 * We should probably reconsider this stuff. Most applications
881 * actually do not need the routes, since they usually specify
882 * the outgoing interface.
883 */
884 rt = rtalloc1(sin6tosa(&mltaddr), 0);
885 if (rt) {
886 if (memcmp(&mltaddr.sin6_addr,
887 &satocsin6(rt_getkey(rt))->sin6_addr,
888 MLTMASK_LEN)) {
889 rt_unref(rt);
890 rt = NULL;
891 } else if (rt->rt_ifp != ifp) {
892 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) "
893 "network %04x:%04x::/32 = %04x:%04x::/32\n",
894 __func__, rt->rt_ifp, ifp, ifp->if_xname,
895 ntohs(mltaddr.sin6_addr.s6_addr16[0]),
896 ntohs(mltaddr.sin6_addr.s6_addr16[1]),
897 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0],
898 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]);
899 #ifdef NET_MPSAFE
900 error = rt_update_prepare(rt);
901 if (error == 0) {
902 rt_replace_ifa(rt, &ia->ia_ifa);
903 rt->rt_ifp = ifp;
904 rt_update_finish(rt);
905 } else {
906 /*
907 * If error != 0, the rtentry is being
908 * destroyed, so doing nothing doesn't
909 * matter.
910 */
911 }
912 #else
913 rt_replace_ifa(rt, &ia->ia_ifa);
914 rt->rt_ifp = ifp;
915 #endif
916 }
917 }
918 if (!rt) {
919 struct rt_addrinfo info;
920
921 memset(&info, 0, sizeof(info));
922 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr);
923 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr);
924 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask);
925 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr);
926 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */
927 info.rti_flags = RTF_UP | RTF_CONNECTED;
928 error = rtrequest1(RTM_ADD, &info, NULL);
929 if (error)
930 goto out;
931 } else {
932 rt_unref(rt);
933 }
934 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
935 if (!imm) {
936 nd6log(LOG_WARNING,
937 "addmulti failed for %s on %s (errno=%d)\n",
938 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
939 if_name(ifp), error);
940 goto out;
941 }
942 mutex_enter(&in6_ifaddr_lock);
943 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
944 mutex_exit(&in6_ifaddr_lock);
945
946 /*
947 * join node information group address
948 */
949 dad_delay = 0;
950 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
951 /*
952 * The spec doesn't say anything about delay for this
953 * group, but the same logic should apply.
954 */
955 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz);
956 }
957 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0)
958 ;
959 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error,
960 dad_delay)) == NULL) { /* XXX jinmei */
961 nd6log(LOG_WARNING,
962 "addmulti failed for %s on %s (errno=%d)\n",
963 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
964 if_name(ifp), error);
965 /* XXX not very fatal, go on... */
966 } else {
967 mutex_enter(&in6_ifaddr_lock);
968 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
969 mutex_exit(&in6_ifaddr_lock);
970 }
971
972
973 /*
974 * join interface-local all-nodes address.
975 * (ff01::1%ifN, and ff01::%ifN/32)
976 */
977 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
978 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
979 goto out; /* XXX: should not fail */
980
981 /* XXX: again, do we really need the route? */
982 rt = rtalloc1(sin6tosa(&mltaddr), 0);
983 if (rt) {
984 /* 32bit came from "mltmask" */
985 if (memcmp(&mltaddr.sin6_addr,
986 &satocsin6(rt_getkey(rt))->sin6_addr,
987 32 / NBBY)) {
988 rt_unref(rt);
989 rt = NULL;
990 } else if (rt->rt_ifp != ifp) {
991 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) "
992 "network %04x:%04x::/32 = %04x:%04x::/32\n",
993 __func__, rt->rt_ifp, ifp, ifp->if_xname,
994 ntohs(mltaddr.sin6_addr.s6_addr16[0]),
995 ntohs(mltaddr.sin6_addr.s6_addr16[1]),
996 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0],
997 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]);
998 #ifdef NET_MPSAFE
999 error = rt_update_prepare(rt);
1000 if (error == 0) {
1001 rt_replace_ifa(rt, &ia->ia_ifa);
1002 rt->rt_ifp = ifp;
1003 rt_update_finish(rt);
1004 } else {
1005 /*
1006 * If error != 0, the rtentry is being
1007 * destroyed, so doing nothing doesn't
1008 * matter.
1009 */
1010 }
1011 #else
1012 rt_replace_ifa(rt, &ia->ia_ifa);
1013 rt->rt_ifp = ifp;
1014 #endif
1015 }
1016 }
1017 if (!rt) {
1018 struct rt_addrinfo info;
1019
1020 memset(&info, 0, sizeof(info));
1021 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr);
1022 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr);
1023 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask);
1024 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr);
1025 info.rti_flags = RTF_UP | RTF_CONNECTED;
1026 error = rtrequest1(RTM_ADD, &info, NULL);
1027 if (error)
1028 goto out;
1029 #undef MLTMASK_LEN
1030 } else {
1031 rt_unref(rt);
1032 }
1033 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
1034 if (!imm) {
1035 nd6log(LOG_WARNING,
1036 "addmulti failed for %s on %s (errno=%d)\n",
1037 IN6_PRINT(ip6buf, &mltaddr.sin6_addr),
1038 if_name(ifp), error);
1039 goto out;
1040 } else {
1041 mutex_enter(&in6_ifaddr_lock);
1042 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
1043 mutex_exit(&in6_ifaddr_lock);
1044 }
1045 return 0;
1046
1047 out:
1048 KASSERT(error != 0);
1049 return error;
1050 }
1051
1052 /*
1053 * Update parameters of an IPv6 interface address.
1054 * If necessary, a new entry is created and linked into address chains.
1055 * This function is separated from in6_control().
1056 * XXX: should this be performed under splsoftnet()?
1057 */
1058 static int
in6_update_ifa1(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr ** iap,struct psref * psref,int flags)1059 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra,
1060 struct in6_ifaddr **iap, struct psref *psref, int flags)
1061 {
1062 int error = 0, hostIsNew = 0, plen = -1;
1063 struct sockaddr_in6 dst6;
1064 struct in6_addrlifetime *lt;
1065 int dad_delay, was_tentative;
1066 struct in6_ifaddr *ia = iap ? *iap : NULL;
1067 char ip6buf[INET6_ADDRSTRLEN];
1068 bool addrmaskNotChanged = false;
1069 bool send_rtm_newaddr = (ip6_param_rt_msg == 1);
1070 int saved_flags = 0;
1071
1072 KASSERT((iap == NULL && psref == NULL) ||
1073 (iap != NULL && psref != NULL));
1074
1075 /* Validate parameters */
1076 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1077 return EINVAL;
1078
1079 /*
1080 * The destination address for a p2p link must have a family
1081 * of AF_UNSPEC or AF_INET6.
1082 */
1083 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1084 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1085 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1086 return EAFNOSUPPORT;
1087 /*
1088 * validate ifra_prefixmask. don't check sin6_family, netmask
1089 * does not carry fields other than sin6_len.
1090 */
1091 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1092 return EINVAL;
1093 /*
1094 * Because the IPv6 address architecture is classless, we require
1095 * users to specify a (non 0) prefix length (mask) for a new address.
1096 * We also require the prefix (when specified) mask is valid, and thus
1097 * reject a non-consecutive mask.
1098 */
1099 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1100 return EINVAL;
1101 if (ifra->ifra_prefixmask.sin6_len != 0) {
1102 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1103 (u_char *)&ifra->ifra_prefixmask +
1104 ifra->ifra_prefixmask.sin6_len);
1105 if (plen <= 0)
1106 return EINVAL;
1107 } else {
1108 /*
1109 * In this case, ia must not be NULL. We just use its prefix
1110 * length.
1111 */
1112 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1113 }
1114 /*
1115 * If the destination address on a p2p interface is specified,
1116 * and the address is a scoped one, validate/set the scope
1117 * zone identifier.
1118 */
1119 dst6 = ifra->ifra_dstaddr;
1120 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1121 (dst6.sin6_family == AF_INET6)) {
1122 struct in6_addr in6_tmp;
1123 u_int32_t zoneid;
1124
1125 in6_tmp = dst6.sin6_addr;
1126 if (in6_setscope(&in6_tmp, ifp, &zoneid))
1127 return EINVAL; /* XXX: should be impossible */
1128
1129 if (dst6.sin6_scope_id != 0) {
1130 if (dst6.sin6_scope_id != zoneid)
1131 return EINVAL;
1132 } else /* user omit to specify the ID. */
1133 dst6.sin6_scope_id = zoneid;
1134
1135 /* convert into the internal form */
1136 if (sa6_embedscope(&dst6, 0))
1137 return EINVAL; /* XXX: should be impossible */
1138 }
1139 /*
1140 * The destination address can be specified only for a p2p or a
1141 * loopback interface. If specified, the corresponding prefix length
1142 * must be 128.
1143 */
1144 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1145 #ifdef FORCE_P2PPLEN
1146 int i;
1147 #endif
1148
1149 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1150 /* XXX: noisy message */
1151 nd6log(LOG_INFO, "a destination can "
1152 "be specified for a p2p or a loopback IF only\n");
1153 return EINVAL;
1154 }
1155 if (plen != 128) {
1156 nd6log(LOG_INFO, "prefixlen should "
1157 "be 128 when dstaddr is specified\n");
1158 #ifdef FORCE_P2PPLEN
1159 /*
1160 * To be compatible with old configurations,
1161 * such as ifconfig gif0 inet6 2001::1 2001::2
1162 * prefixlen 126, we override the specified
1163 * prefixmask as if the prefix length was 128.
1164 */
1165 ifra->ifra_prefixmask.sin6_len =
1166 sizeof(struct sockaddr_in6);
1167 for (i = 0; i < 4; i++)
1168 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] =
1169 0xffffffff;
1170 plen = 128;
1171 #else
1172 return EINVAL;
1173 #endif
1174 }
1175 }
1176 /* lifetime consistency check */
1177 lt = &ifra->ifra_lifetime;
1178 if (lt->ia6t_pltime > lt->ia6t_vltime)
1179 return EINVAL;
1180 if (lt->ia6t_vltime == 0) {
1181 /*
1182 * the following log might be noisy, but this is a typical
1183 * configuration mistake or a tool's bug.
1184 */
1185 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n",
1186 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr));
1187
1188 if (ia == NULL)
1189 return 0; /* there's nothing to do */
1190 }
1191
1192 #define sin6eq(a, b) \
1193 ((a)->sin6_len == sizeof(struct sockaddr_in6) && \
1194 (b)->sin6_len == sizeof(struct sockaddr_in6) && \
1195 IN6_ARE_ADDR_EQUAL(&(a)->sin6_addr, &(b)->sin6_addr))
1196
1197 if (!send_rtm_newaddr) {
1198 if (ia != NULL &&
1199 sin6eq(&ifra->ifra_addr, &ia->ia_addr) &&
1200 sin6eq(&ifra->ifra_prefixmask, &ia->ia_prefixmask)) {
1201 addrmaskNotChanged = true;
1202 saved_flags = ia->ia6_flags; /* check it later */
1203 }
1204 }
1205 #undef sin6eq
1206
1207 /*
1208 * If this is a new address, allocate a new ifaddr and link it
1209 * into chains.
1210 */
1211 if (ia == NULL) {
1212 hostIsNew = 1;
1213 /*
1214 * When in6_update_ifa() is called in a process of a received
1215 * RA, it is called under an interrupt context. So, we should
1216 * call malloc with M_NOWAIT.
1217 */
1218 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO);
1219 if (ia == NULL)
1220 return ENOBUFS;
1221 LIST_INIT(&ia->ia6_memberships);
1222 /* Initialize the address and masks, and put time stamp */
1223 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr);
1224 ia->ia_addr.sin6_family = AF_INET6;
1225 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1226 ia->ia6_createtime = time_uptime;
1227 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1228 /*
1229 * XXX: some functions expect that ifa_dstaddr is not
1230 * NULL for p2p interfaces.
1231 */
1232 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr);
1233 } else {
1234 ia->ia_ifa.ifa_dstaddr = NULL;
1235 }
1236 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask);
1237
1238 ia->ia_ifp = ifp;
1239 IN6_ADDRLIST_ENTRY_INIT(ia);
1240 ifa_psref_init(&ia->ia_ifa);
1241 }
1242
1243 /* update timestamp */
1244 ia->ia6_updatetime = time_uptime;
1245
1246 /* set prefix mask */
1247 if (ifra->ifra_prefixmask.sin6_len) {
1248 if (ia->ia_prefixmask.sin6_len) {
1249 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr,
1250 &ifra->ifra_prefixmask.sin6_addr))
1251 in6_ifremprefix(ia);
1252 }
1253 ia->ia_prefixmask = ifra->ifra_prefixmask;
1254 }
1255
1256 /* Set destination address. */
1257 if (dst6.sin6_family == AF_INET6) {
1258 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
1259 &ia->ia_dstaddr.sin6_addr))
1260 in6_ifremprefix(ia);
1261 ia->ia_dstaddr = dst6;
1262 }
1263
1264 /*
1265 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1266 * to see if the address is deprecated or invalidated, but initialize
1267 * these members for applications.
1268 */
1269 ia->ia6_lifetime = ifra->ifra_lifetime;
1270 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1271 ia->ia6_lifetime.ia6t_expire =
1272 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1273 } else
1274 ia->ia6_lifetime.ia6t_expire = 0;
1275 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1276 ia->ia6_lifetime.ia6t_preferred =
1277 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1278 } else
1279 ia->ia6_lifetime.ia6t_preferred = 0;
1280
1281 /*
1282 * configure address flags.
1283 * We need to preserve tentative state so DAD works if
1284 * something adds the same address before DAD finishes.
1285 */
1286 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED);
1287 ia->ia6_flags = ifra->ifra_flags;
1288
1289 /*
1290 * Make the address tentative before joining multicast addresses,
1291 * so that corresponding MLD responses would not have a tentative
1292 * source address.
1293 */
1294 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1295 if (ifp->if_link_state == LINK_STATE_DOWN) {
1296 ia->ia6_flags |= IN6_IFF_DETACHED;
1297 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1298 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp) &&
1299 ip6_dad_enabled()) {
1300 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1301 }
1302
1303 /*
1304 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1305 * userland, make it deprecated.
1306 */
1307 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1308 ia->ia6_lifetime.ia6t_pltime = 0;
1309 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1310 }
1311
1312 if (!send_rtm_newaddr) {
1313 /*
1314 * We will not send RTM_NEWADDR if the only difference between
1315 * ia and ifra is preferred/valid lifetimes, because it is not
1316 * very useful for userland programs to be notified of that
1317 * changes.
1318 */
1319 if (addrmaskNotChanged && ia->ia6_flags == saved_flags)
1320 return 0;
1321 }
1322
1323 if (hostIsNew) {
1324 /*
1325 * We need a reference to ia before calling in6_ifinit.
1326 * Otherwise ia can be freed in in6_ifinit accidentally.
1327 */
1328 ifaref(&ia->ia_ifa);
1329 }
1330
1331 /* Must execute in6_ifinit and ifa_insert atomically */
1332 mutex_enter(&in6_ifaddr_lock);
1333
1334 /* reset the interface and routing table appropriately. */
1335 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew);
1336 if (error != 0) {
1337 if (hostIsNew)
1338 free(ia, M_IFADDR);
1339 mutex_exit(&in6_ifaddr_lock);
1340 return error;
1341 }
1342
1343 /*
1344 * We are done if we have simply modified an existing address.
1345 */
1346 if (!hostIsNew) {
1347 mutex_exit(&in6_ifaddr_lock);
1348 return error;
1349 }
1350
1351 /*
1352 * Insert ia to the global list and ifa to the interface's list.
1353 * A reference to it is already gained above.
1354 */
1355 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia);
1356 ifa_insert(ifp, &ia->ia_ifa);
1357
1358 mutex_exit(&in6_ifaddr_lock);
1359
1360 /*
1361 * Beyond this point, we should call in6_purgeaddr upon an error,
1362 * not just go to unlink.
1363 */
1364
1365 /* join necessary multicast groups */
1366 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1367 error = in6_join_mcastgroups(ifra, ia, ifp, flags);
1368 if (error != 0)
1369 goto cleanup;
1370 }
1371
1372 if (nd6_need_cache(ifp)) {
1373 /* XXX maybe unnecessary */
1374 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1375 ia->ia_ifa.ifa_flags |= RTF_CONNECTED;
1376 }
1377
1378 /*
1379 * Perform DAD, if needed.
1380 * XXX It may be of use, if we can administratively
1381 * disable DAD.
1382 */
1383 if (hostIsNew && if_do_dad(ifp) &&
1384 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1385 (ia->ia6_flags & IN6_IFF_TENTATIVE))
1386 {
1387 int mindelay, maxdelay;
1388
1389 dad_delay = 0;
1390 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1391 struct in6_addr llsol;
1392 struct in6_multi *in6m_sol = NULL;
1393 /*
1394 * We need to impose a delay before sending an NS
1395 * for DAD. Check if we also needed a delay for the
1396 * corresponding MLD message. If we did, the delay
1397 * should be larger than the MLD delay (this could be
1398 * relaxed a bit, but this simple logic is at least
1399 * safe).
1400 */
1401 mindelay = 0;
1402 error = in6_get_llsol_addr(&llsol, ifp,
1403 &ifra->ifra_addr.sin6_addr);
1404 in6_multi_lock(RW_READER);
1405 if (error == 0)
1406 in6m_sol = in6_lookup_multi(&llsol, ifp);
1407 if (in6m_sol != NULL &&
1408 in6m_sol->in6m_state == MLD_REPORTPENDING) {
1409 mindelay = in6m_sol->in6m_timer;
1410 }
1411 in6_multi_unlock();
1412 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1413 if (maxdelay - mindelay == 0)
1414 dad_delay = 0;
1415 else {
1416 dad_delay =
1417 (cprng_fast32() % (maxdelay - mindelay)) +
1418 mindelay;
1419 }
1420 }
1421 /* +1 ensures callout is always used */
1422 nd6_dad_start(&ia->ia_ifa, dad_delay + 1);
1423 }
1424
1425 if (iap != NULL) {
1426 *iap = ia;
1427 if (hostIsNew)
1428 ia6_acquire(ia, psref);
1429 }
1430
1431 return 0;
1432
1433 cleanup:
1434 in6_purgeaddr(&ia->ia_ifa);
1435 return error;
1436 }
1437
1438 int
in6_update_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,int flags)1439 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1440 {
1441 int rc, s;
1442
1443 s = splsoftnet();
1444 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags);
1445 splx(s);
1446 return rc;
1447 }
1448
1449 void
in6_purgeaddr(struct ifaddr * ifa)1450 in6_purgeaddr(struct ifaddr *ifa)
1451 {
1452 struct ifnet *ifp = ifa->ifa_ifp;
1453 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1454 struct in6_multi_mship *imm;
1455
1456 /* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */
1457 KASSERT(IFNET_LOCKED(ifp));
1458
1459 ifa->ifa_flags |= IFA_DESTROYING;
1460
1461 /* stop DAD processing */
1462 nd6_dad_stop(ifa);
1463
1464 /* Delete any network route. */
1465 in6_ifremprefix(ia);
1466
1467 /* Remove ownaddr's loopback rtentry, if it exists. */
1468 in6_ifremlocal(&(ia->ia_ifa));
1469
1470 /*
1471 * leave from multicast groups we have joined for the interface
1472 */
1473 again:
1474 mutex_enter(&in6_ifaddr_lock);
1475 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1476 struct in6_multi *in6m __diagused = imm->i6mm_maddr;
1477 KASSERTMSG(in6m == NULL || in6m->in6m_ifp == ifp,
1478 "in6m_ifp=%s ifp=%s", in6m ? in6m->in6m_ifp->if_xname : NULL,
1479 ifp->if_xname);
1480 LIST_REMOVE(imm, i6mm_chain);
1481 mutex_exit(&in6_ifaddr_lock);
1482
1483 in6_leavegroup(imm);
1484 goto again;
1485 }
1486 mutex_exit(&in6_ifaddr_lock);
1487
1488 in6_unlink_ifa(ia, ifp);
1489 }
1490
1491 static void
in6_unlink_ifa(struct in6_ifaddr * ia,struct ifnet * ifp)1492 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1493 {
1494 int s = splsoftnet();
1495
1496 mutex_enter(&in6_ifaddr_lock);
1497 IN6_ADDRLIST_WRITER_REMOVE(ia);
1498 ifa_remove(ifp, &ia->ia_ifa);
1499 /* Assume ifa_remove called pserialize_perform and psref_destroy */
1500 mutex_exit(&in6_ifaddr_lock);
1501 IN6_ADDRLIST_ENTRY_DESTROY(ia);
1502
1503 /*
1504 * release another refcnt for the link from in6_ifaddr.
1505 * Note that we should decrement the refcnt at least once for all *BSD.
1506 */
1507 ifafree(&ia->ia_ifa);
1508
1509 splx(s);
1510 }
1511
1512 void
in6_purgeif(struct ifnet * ifp)1513 in6_purgeif(struct ifnet *ifp)
1514 {
1515
1516 IFNET_LOCK(ifp);
1517 in6_ifdetach(ifp);
1518 IFNET_UNLOCK(ifp);
1519 }
1520
1521 void
in6_purge_mcast_references(struct in6_multi * in6m)1522 in6_purge_mcast_references(struct in6_multi *in6m)
1523 {
1524 struct in6_ifaddr *ia;
1525
1526 KASSERT(in6_multi_locked(RW_WRITER));
1527
1528 mutex_enter(&in6_ifaddr_lock);
1529 IN6_ADDRLIST_WRITER_FOREACH(ia) {
1530 struct in6_multi_mship *imm;
1531 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) {
1532 if (imm->i6mm_maddr == in6m)
1533 imm->i6mm_maddr = NULL;
1534 }
1535 }
1536 mutex_exit(&in6_ifaddr_lock);
1537 }
1538
1539 /*
1540 * SIOC[GAD]LIFADDR.
1541 * SIOCGLIFADDR: get first address. (?)
1542 * SIOCGLIFADDR with IFLR_PREFIX:
1543 * get first address that matches the specified prefix.
1544 * SIOCALIFADDR: add the specified address.
1545 * SIOCALIFADDR with IFLR_PREFIX:
1546 * add the specified prefix, filling hostid part from
1547 * the first link-local address. prefixlen must be <= 64.
1548 * SIOCDLIFADDR: delete the specified address.
1549 * SIOCDLIFADDR with IFLR_PREFIX:
1550 * delete the first address that matches the specified prefix.
1551 * return values:
1552 * EINVAL on invalid parameters
1553 * EADDRNOTAVAIL on prefix match failed/specified address not found
1554 * other values may be returned from in6_ioctl()
1555 *
1556 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1557 * this is to accommodate address naming scheme other than RFC2374,
1558 * in the future.
1559 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1560 * address encoding scheme. (see figure on page 8)
1561 */
1562 static int
in6_lifaddr_ioctl(struct socket * so,u_long cmd,void * data,struct ifnet * ifp)1563 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data,
1564 struct ifnet *ifp)
1565 {
1566 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */
1567 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1568 struct ifaddr *ifa;
1569 struct sockaddr *sa;
1570
1571 /* sanity checks */
1572 if (!data || !ifp) {
1573 panic("invalid argument to in6_lifaddr_ioctl");
1574 /* NOTREACHED */
1575 }
1576
1577 switch (cmd) {
1578 case SIOCGLIFADDR:
1579 /* address must be specified on GET with IFLR_PREFIX */
1580 if ((iflr->flags & IFLR_PREFIX) == 0)
1581 break;
1582 /* FALLTHROUGH */
1583 case SIOCALIFADDR:
1584 case SIOCDLIFADDR:
1585 /* address must be specified on ADD and DELETE */
1586 sa = (struct sockaddr *)&iflr->addr;
1587 if (sa->sa_family != AF_INET6)
1588 return EINVAL;
1589 if (sa->sa_len != sizeof(struct sockaddr_in6))
1590 return EINVAL;
1591 /* XXX need improvement */
1592 sa = (struct sockaddr *)&iflr->dstaddr;
1593 if (sa->sa_family && sa->sa_family != AF_INET6)
1594 return EINVAL;
1595 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1596 return EINVAL;
1597 break;
1598 default: /* shouldn't happen */
1599 #if 0
1600 panic("invalid cmd to in6_lifaddr_ioctl");
1601 /* NOTREACHED */
1602 #else
1603 return EOPNOTSUPP;
1604 #endif
1605 }
1606 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen)
1607 return EINVAL;
1608
1609 switch (cmd) {
1610 case SIOCALIFADDR:
1611 {
1612 struct in6_aliasreq ifra;
1613 struct in6_addr *xhostid = NULL;
1614 int prefixlen;
1615 int bound = curlwp_bind();
1616 struct psref psref;
1617
1618 if ((iflr->flags & IFLR_PREFIX) != 0) {
1619 struct sockaddr_in6 *sin6;
1620
1621 /*
1622 * xhostid is to fill in the hostid part of the
1623 * address. xhostid points to the first link-local
1624 * address attached to the interface.
1625 */
1626 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref);
1627 if (ia == NULL) {
1628 curlwp_bindx(bound);
1629 return EADDRNOTAVAIL;
1630 }
1631 xhostid = IFA_IN6(&ia->ia_ifa);
1632
1633 /* prefixlen must be <= 64. */
1634 if (64 < iflr->prefixlen) {
1635 ia6_release(ia, &psref);
1636 curlwp_bindx(bound);
1637 return EINVAL;
1638 }
1639 prefixlen = iflr->prefixlen;
1640
1641 /* hostid part must be zero. */
1642 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1643 if (sin6->sin6_addr.s6_addr32[2] != 0
1644 || sin6->sin6_addr.s6_addr32[3] != 0) {
1645 ia6_release(ia, &psref);
1646 curlwp_bindx(bound);
1647 return EINVAL;
1648 }
1649 } else
1650 prefixlen = iflr->prefixlen;
1651
1652 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1653 memset(&ifra, 0, sizeof(ifra));
1654 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name));
1655
1656 memcpy(&ifra.ifra_addr, &iflr->addr,
1657 ((struct sockaddr *)&iflr->addr)->sa_len);
1658 if (xhostid) {
1659 /* fill in hostid part */
1660 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1661 xhostid->s6_addr32[2];
1662 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1663 xhostid->s6_addr32[3];
1664 }
1665
1666 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1667 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr,
1668 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1669 if (xhostid) {
1670 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1671 xhostid->s6_addr32[2];
1672 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1673 xhostid->s6_addr32[3];
1674 }
1675 }
1676 if (xhostid) {
1677 ia6_release(ia, &psref);
1678 ia = NULL;
1679 }
1680 curlwp_bindx(bound);
1681
1682 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1683 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1684
1685 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
1686 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
1687 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1688 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp);
1689 }
1690 case SIOCGLIFADDR:
1691 case SIOCDLIFADDR:
1692 {
1693 struct in6_addr mask, candidate, match;
1694 struct sockaddr_in6 *sin6;
1695 int cmp;
1696 int error, s;
1697
1698 memset(&mask, 0, sizeof(mask));
1699 if (iflr->flags & IFLR_PREFIX) {
1700 /* lookup a prefix rather than address. */
1701 in6_prefixlen2mask(&mask, iflr->prefixlen);
1702
1703 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1704 memcpy(&match, &sin6->sin6_addr, sizeof(match));
1705 match.s6_addr32[0] &= mask.s6_addr32[0];
1706 match.s6_addr32[1] &= mask.s6_addr32[1];
1707 match.s6_addr32[2] &= mask.s6_addr32[2];
1708 match.s6_addr32[3] &= mask.s6_addr32[3];
1709
1710 /* if you set extra bits, that's wrong */
1711 if (memcmp(&match, &sin6->sin6_addr, sizeof(match)))
1712 return EINVAL;
1713
1714 cmp = 1;
1715 } else {
1716 if (cmd == SIOCGLIFADDR) {
1717 /* on getting an address, take the 1st match */
1718 cmp = 0; /* XXX */
1719 } else {
1720 /* on deleting an address, do exact match */
1721 in6_prefixlen2mask(&mask, 128);
1722 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1723 memcpy(&match, &sin6->sin6_addr, sizeof(match));
1724
1725 cmp = 1;
1726 }
1727 }
1728
1729 s = pserialize_read_enter();
1730 IFADDR_READER_FOREACH(ifa, ifp) {
1731 if (ifa->ifa_addr->sa_family != AF_INET6)
1732 continue;
1733 if (!cmp)
1734 break;
1735
1736 /*
1737 * XXX: this is adhoc, but is necessary to allow
1738 * a user to specify fe80::/64 (not /10) for a
1739 * link-local address.
1740 */
1741 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate));
1742 in6_clearscope(&candidate);
1743 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1744 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1745 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1746 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1747 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1748 break;
1749 }
1750 if (!ifa) {
1751 error = EADDRNOTAVAIL;
1752 goto error;
1753 }
1754 ia = ifa2ia6(ifa);
1755
1756 if (cmd == SIOCGLIFADDR) {
1757 /* fill in the if_laddrreq structure */
1758 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len);
1759 error = sa6_recoverscope(
1760 (struct sockaddr_in6 *)&iflr->addr);
1761 if (error != 0)
1762 goto error;
1763
1764 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1765 memcpy(&iflr->dstaddr, &ia->ia_dstaddr,
1766 ia->ia_dstaddr.sin6_len);
1767 error = sa6_recoverscope(
1768 (struct sockaddr_in6 *)&iflr->dstaddr);
1769 if (error != 0)
1770 goto error;
1771 } else
1772 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr));
1773
1774 iflr->prefixlen =
1775 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1776
1777 iflr->flags = ia->ia6_flags; /* XXX */
1778
1779 error = 0;
1780 } else {
1781 struct in6_aliasreq ifra;
1782
1783 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1784 memset(&ifra, 0, sizeof(ifra));
1785 memcpy(ifra.ifra_name, iflr->iflr_name,
1786 sizeof(ifra.ifra_name));
1787
1788 memcpy(&ifra.ifra_addr, &ia->ia_addr,
1789 ia->ia_addr.sin6_len);
1790 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1791 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr,
1792 ia->ia_dstaddr.sin6_len);
1793 } else {
1794 memset(&ifra.ifra_dstaddr, 0,
1795 sizeof(ifra.ifra_dstaddr));
1796 }
1797 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask,
1798 ia->ia_prefixmask.sin6_len);
1799
1800 ifra.ifra_flags = ia->ia6_flags;
1801 pserialize_read_exit(s);
1802
1803 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp);
1804 }
1805 error:
1806 pserialize_read_exit(s);
1807 return error;
1808 }
1809 }
1810
1811 return EOPNOTSUPP; /* just for safety */
1812 }
1813
1814 /*
1815 * Initialize an interface's internet6 address
1816 * and routing table entry.
1817 */
1818 static int
in6_ifinit(struct ifnet * ifp,struct in6_ifaddr * ia,const struct sockaddr_in6 * sin6,int newhost)1819 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1820 const struct sockaddr_in6 *sin6, int newhost)
1821 {
1822 int error = 0, ifacount = 0;
1823 int s;
1824 struct ifaddr *ifa;
1825
1826 KASSERT(mutex_owned(&in6_ifaddr_lock));
1827
1828 /*
1829 * Give the interface a chance to initialize
1830 * if this is its first address,
1831 * and to validate the address if necessary.
1832 */
1833 s = pserialize_read_enter();
1834 IFADDR_READER_FOREACH(ifa, ifp) {
1835 if (ifa->ifa_addr->sa_family != AF_INET6)
1836 continue;
1837 ifacount++;
1838 }
1839 pserialize_read_exit(s);
1840
1841 ia->ia_addr = *sin6;
1842
1843 if (ifacount == 0 &&
1844 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) {
1845 return error;
1846 }
1847
1848 ia->ia_ifa.ifa_metric = ifp->if_metric;
1849
1850 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1851
1852 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1853 if (newhost) {
1854 /* set the rtrequest function to create llinfo */
1855 if (ifp->if_flags & IFF_POINTOPOINT)
1856 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest;
1857 else if ((ifp->if_flags & IFF_LOOPBACK) == 0)
1858 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1859 in6_ifaddlocal(&ia->ia_ifa);
1860 } else {
1861 /* Inform the routing socket of new flags/timings */
1862 rt_addrmsg(RTM_NEWADDR, &ia->ia_ifa);
1863 }
1864
1865 /* Add the network prefix route. */
1866 if ((error = in6_ifaddprefix(ia)) != 0) {
1867 if (newhost)
1868 in6_ifremlocal(&ia->ia_ifa);
1869 return error;
1870 }
1871
1872 return error;
1873 }
1874
1875 static struct ifaddr *
bestifa(struct ifaddr * best_ifa,struct ifaddr * ifa)1876 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa)
1877 {
1878 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference)
1879 return ifa;
1880 return best_ifa;
1881 }
1882
1883 /*
1884 * Find an IPv6 interface link-local address specific to an interface.
1885 */
1886 struct in6_ifaddr *
in6ifa_ifpforlinklocal(const struct ifnet * ifp,const int ignoreflags)1887 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags)
1888 {
1889 struct ifaddr *best_ifa = NULL, *ifa;
1890
1891 IFADDR_READER_FOREACH(ifa, ifp) {
1892 if (ifa->ifa_addr->sa_family != AF_INET6)
1893 continue;
1894 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa)))
1895 continue;
1896 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0)
1897 continue;
1898 best_ifa = bestifa(best_ifa, ifa);
1899 }
1900
1901 return (struct in6_ifaddr *)best_ifa;
1902 }
1903
1904 struct in6_ifaddr *
in6ifa_ifpforlinklocal_psref(const struct ifnet * ifp,const int ignoreflags,struct psref * psref)1905 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags,
1906 struct psref *psref)
1907 {
1908 struct in6_ifaddr *ia;
1909 int s = pserialize_read_enter();
1910
1911 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags);
1912 if (ia != NULL)
1913 ia6_acquire(ia, psref);
1914 pserialize_read_exit(s);
1915
1916 return ia;
1917 }
1918
1919 /*
1920 * find the internet address corresponding to a given address.
1921 * ifaddr is returned referenced.
1922 */
1923 struct in6_ifaddr *
in6ifa_ifwithaddr(const struct in6_addr * addr,uint32_t zoneid)1924 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1925 {
1926 struct in6_ifaddr *ia;
1927 int s;
1928
1929 s = pserialize_read_enter();
1930 IN6_ADDRLIST_READER_FOREACH(ia) {
1931 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1932 if (zoneid != 0 &&
1933 zoneid != ia->ia_addr.sin6_scope_id)
1934 continue;
1935 ifaref(&ia->ia_ifa);
1936 break;
1937 }
1938 }
1939 pserialize_read_exit(s);
1940
1941 return ia;
1942 }
1943
1944 /*
1945 * find the internet address corresponding to a given interface and address.
1946 */
1947 struct in6_ifaddr *
in6ifa_ifpwithaddr(const struct ifnet * ifp,const struct in6_addr * addr)1948 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr)
1949 {
1950 struct ifaddr *best_ifa = NULL, *ifa;
1951
1952 IFADDR_READER_FOREACH(ifa, ifp) {
1953 if (ifa->ifa_addr->sa_family != AF_INET6)
1954 continue;
1955 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1956 continue;
1957 best_ifa = bestifa(best_ifa, ifa);
1958 }
1959
1960 return (struct in6_ifaddr *)best_ifa;
1961 }
1962
1963 struct in6_ifaddr *
in6ifa_ifpwithaddr_psref(const struct ifnet * ifp,const struct in6_addr * addr,struct psref * psref)1964 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr,
1965 struct psref *psref)
1966 {
1967 struct in6_ifaddr *ia;
1968 int s = pserialize_read_enter();
1969
1970 ia = in6ifa_ifpwithaddr(ifp, addr);
1971 if (ia != NULL)
1972 ia6_acquire(ia, psref);
1973 pserialize_read_exit(s);
1974
1975 return ia;
1976 }
1977
1978 static struct in6_ifaddr *
bestia(struct in6_ifaddr * best_ia,struct in6_ifaddr * ia)1979 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia)
1980 {
1981 if (best_ia == NULL ||
1982 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference)
1983 return ia;
1984 return best_ia;
1985 }
1986
1987 /*
1988 * Determine if an address is on a local network.
1989 */
1990 int
in6_localaddr(const struct in6_addr * in6)1991 in6_localaddr(const struct in6_addr *in6)
1992 {
1993 struct in6_ifaddr *ia;
1994 int s;
1995
1996 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1997 return 1;
1998
1999 s = pserialize_read_enter();
2000 IN6_ADDRLIST_READER_FOREACH(ia) {
2001 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2002 &ia->ia_prefixmask.sin6_addr)) {
2003 pserialize_read_exit(s);
2004 return 1;
2005 }
2006 }
2007 pserialize_read_exit(s);
2008
2009 return 0;
2010 }
2011
2012 int
in6_is_addr_deprecated(struct sockaddr_in6 * sa6)2013 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2014 {
2015 struct in6_ifaddr *ia;
2016 int s;
2017
2018 s = pserialize_read_enter();
2019 IN6_ADDRLIST_READER_FOREACH(ia) {
2020 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2021 &sa6->sin6_addr) &&
2022 #ifdef SCOPEDROUTING
2023 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
2024 #endif
2025 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2026 pserialize_read_exit(s);
2027 return 1; /* true */
2028 }
2029
2030 /* XXX: do we still have to go thru the rest of the list? */
2031 }
2032 pserialize_read_exit(s);
2033
2034 return 0; /* false */
2035 }
2036
2037 /*
2038 * return length of part which dst and src are equal
2039 * hard coding...
2040 */
2041 int
in6_matchlen(struct in6_addr * src,struct in6_addr * dst)2042 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2043 {
2044 int match = 0;
2045 u_char *s = (u_char *)src, *d = (u_char *)dst;
2046 u_char *lim = s + 16, r;
2047
2048 while (s < lim)
2049 if ((r = (*d++ ^ *s++)) != 0) {
2050 while (r < 128) {
2051 match++;
2052 r <<= 1;
2053 }
2054 break;
2055 } else
2056 match += NBBY;
2057 return match;
2058 }
2059
2060 void
in6_prefixlen2mask(struct in6_addr * maskp,int len)2061 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2062 {
2063 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2064 int bytelen, bitlen, i;
2065
2066 /* sanity check */
2067 if (len < 0 || len > 128) {
2068 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2069 len);
2070 return;
2071 }
2072
2073 memset(maskp, 0, sizeof(*maskp));
2074 bytelen = len / NBBY;
2075 bitlen = len % NBBY;
2076 for (i = 0; i < bytelen; i++)
2077 maskp->s6_addr[i] = 0xff;
2078 if (bitlen)
2079 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2080 }
2081
2082 /*
2083 * return the best address out of the same scope. if no address was
2084 * found, return the first valid address from designated IF.
2085 */
2086 struct in6_ifaddr *
in6_ifawithifp(struct ifnet * ifp,struct in6_addr * dst)2087 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2088 {
2089 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2090 struct ifaddr *ifa;
2091 struct in6_ifaddr *best_ia = NULL, *ia;
2092 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2093
2094 dep[0] = dep[1] = NULL;
2095
2096 /*
2097 * We first look for addresses in the same scope.
2098 * If there is one, return it.
2099 * If two or more, return one which matches the dst longest.
2100 * If none, return one of global addresses assigned other ifs.
2101 */
2102 IFADDR_READER_FOREACH(ifa, ifp) {
2103 if (ifa->ifa_addr->sa_family != AF_INET6)
2104 continue;
2105 ia = (struct in6_ifaddr *)ifa;
2106 if (ia->ia6_flags & IN6_IFF_ANYCAST)
2107 continue; /* XXX: is there any case to allow anycast? */
2108 if (ia->ia6_flags & IN6_IFF_NOTREADY)
2109 continue; /* don't use this interface */
2110 if (ia->ia6_flags & IN6_IFF_DETACHED)
2111 continue;
2112 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2113 if (ip6_use_deprecated)
2114 dep[0] = ia;
2115 continue;
2116 }
2117
2118 if (dst_scope != in6_addrscope(IFA_IN6(ifa)))
2119 continue;
2120 /*
2121 * call in6_matchlen() as few as possible
2122 */
2123 if (best_ia == NULL) {
2124 best_ia = ia;
2125 continue;
2126 }
2127 if (blen == -1)
2128 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst);
2129 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2130 if (tlen > blen) {
2131 blen = tlen;
2132 best_ia = ia;
2133 } else if (tlen == blen)
2134 best_ia = bestia(best_ia, ia);
2135 }
2136 if (best_ia != NULL)
2137 return best_ia;
2138
2139 IFADDR_READER_FOREACH(ifa, ifp) {
2140 if (ifa->ifa_addr->sa_family != AF_INET6)
2141 continue;
2142 ia = (struct in6_ifaddr *)ifa;
2143 if (ia->ia6_flags & IN6_IFF_ANYCAST)
2144 continue; /* XXX: is there any case to allow anycast? */
2145 if (ia->ia6_flags & IN6_IFF_NOTREADY)
2146 continue; /* don't use this interface */
2147 if (ia->ia6_flags & IN6_IFF_DETACHED)
2148 continue;
2149 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
2150 if (ip6_use_deprecated)
2151 dep[1] = (struct in6_ifaddr *)ifa;
2152 continue;
2153 }
2154
2155 best_ia = bestia(best_ia, ia);
2156 }
2157 if (best_ia != NULL)
2158 return best_ia;
2159
2160 /* use the last-resort values, that are, deprecated addresses */
2161 if (dep[0])
2162 return dep[0];
2163 if (dep[1])
2164 return dep[1];
2165
2166 return NULL;
2167 }
2168
2169 /*
2170 * perform DAD when interface becomes IFF_UP.
2171 */
2172 void
in6_if_link_up(struct ifnet * ifp)2173 in6_if_link_up(struct ifnet *ifp)
2174 {
2175 struct ifaddr *ifa;
2176 struct in6_ifaddr *ia;
2177 int s, bound;
2178 char ip6buf[INET6_ADDRSTRLEN];
2179
2180 /* Ensure it's sane to run DAD */
2181 if (ifp->if_link_state == LINK_STATE_DOWN)
2182 return;
2183 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
2184 return;
2185
2186 bound = curlwp_bind();
2187 s = pserialize_read_enter();
2188 IFADDR_READER_FOREACH(ifa, ifp) {
2189 struct psref psref;
2190
2191 if (ifa->ifa_addr->sa_family != AF_INET6)
2192 continue;
2193
2194 ifa_acquire(ifa, &psref);
2195 pserialize_read_exit(s);
2196 ia = (struct in6_ifaddr *)ifa;
2197
2198 /* If detached then mark as tentative */
2199 if (ia->ia6_flags & IN6_IFF_DETACHED) {
2200 ia->ia6_flags &= ~IN6_IFF_DETACHED;
2201 if (ip6_dad_enabled() && if_do_dad(ifp)) {
2202 ia->ia6_flags |= IN6_IFF_TENTATIVE;
2203 nd6log(LOG_ERR, "%s marked tentative\n",
2204 IN6_PRINT(ip6buf,
2205 &ia->ia_addr.sin6_addr));
2206 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0)
2207 rt_addrmsg(RTM_NEWADDR, ifa);
2208 }
2209
2210 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2211 int rand_delay;
2212
2213 /* Clear the duplicated flag as we're starting DAD. */
2214 ia->ia6_flags &= ~IN6_IFF_DUPLICATED;
2215
2216 /*
2217 * The TENTATIVE flag was likely set by hand
2218 * beforehand, implicitly indicating the need for DAD.
2219 * We may be able to skip the random delay in this
2220 * case, but we impose delays just in case.
2221 */
2222 rand_delay = cprng_fast32() %
2223 (MAX_RTR_SOLICITATION_DELAY * hz);
2224 /* +1 ensures callout is always used */
2225 nd6_dad_start(ifa, rand_delay + 1);
2226 }
2227
2228 s = pserialize_read_enter();
2229 ifa_release(ifa, &psref);
2230 }
2231 pserialize_read_exit(s);
2232 curlwp_bindx(bound);
2233 }
2234
2235 void
in6_if_up(struct ifnet * ifp)2236 in6_if_up(struct ifnet *ifp)
2237 {
2238
2239 /*
2240 * special cases, like 6to4, are handled in in6_ifattach
2241 */
2242 in6_ifattach(ifp, NULL);
2243
2244 /* interface may not support link state, so bring it up also */
2245 in6_if_link_up(ifp);
2246 }
2247
2248 /*
2249 * Mark all addresses as detached.
2250 */
2251 void
in6_if_link_down(struct ifnet * ifp)2252 in6_if_link_down(struct ifnet *ifp)
2253 {
2254 struct ifaddr *ifa;
2255 struct in6_ifaddr *ia;
2256 int s, bound;
2257 char ip6buf[INET6_ADDRSTRLEN];
2258
2259 bound = curlwp_bind();
2260 s = pserialize_read_enter();
2261 IFADDR_READER_FOREACH(ifa, ifp) {
2262 struct psref psref;
2263
2264 if (ifa->ifa_addr->sa_family != AF_INET6)
2265 continue;
2266
2267 ifa_acquire(ifa, &psref);
2268 pserialize_read_exit(s);
2269 ia = (struct in6_ifaddr *)ifa;
2270
2271 /* Stop DAD processing */
2272 nd6_dad_stop(ifa);
2273
2274 /*
2275 * Mark the address as detached.
2276 * This satisfies RFC4862 Section 5.3, but we should apply
2277 * this logic to all addresses to be a good citizen and
2278 * avoid potential duplicated addresses.
2279 * When the interface comes up again, detached addresses
2280 * are marked tentative and DAD commences.
2281 */
2282 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) {
2283 nd6log(LOG_DEBUG, "%s marked detached\n",
2284 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr));
2285 ia->ia6_flags |= IN6_IFF_DETACHED;
2286 ia->ia6_flags &=
2287 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED);
2288 rt_addrmsg(RTM_NEWADDR, ifa);
2289 }
2290
2291 s = pserialize_read_enter();
2292 ifa_release(ifa, &psref);
2293 }
2294 pserialize_read_exit(s);
2295 curlwp_bindx(bound);
2296 }
2297
2298 void
in6_if_down(struct ifnet * ifp)2299 in6_if_down(struct ifnet *ifp)
2300 {
2301
2302 in6_if_link_down(ifp);
2303 lltable_purge_entries(LLTABLE6(ifp));
2304 }
2305
2306 void
in6_if_link_state_change(struct ifnet * ifp,int link_state)2307 in6_if_link_state_change(struct ifnet *ifp, int link_state)
2308 {
2309
2310 /*
2311 * Treat LINK_STATE_UNKNOWN as UP.
2312 * LINK_STATE_UNKNOWN transitions to LINK_STATE_DOWN when
2313 * if_link_state_change() transitions to LINK_STATE_UP.
2314 */
2315 if (link_state == LINK_STATE_DOWN)
2316 in6_if_link_down(ifp);
2317 else
2318 in6_if_link_up(ifp);
2319 }
2320
2321 int
in6_tunnel_validate(const struct ip6_hdr * ip6,const struct in6_addr * src,const struct in6_addr * dst)2322 in6_tunnel_validate(const struct ip6_hdr *ip6, const struct in6_addr *src,
2323 const struct in6_addr *dst)
2324 {
2325
2326 /* check for address match */
2327 if (!IN6_ARE_ADDR_EQUAL(src, &ip6->ip6_dst) ||
2328 !IN6_ARE_ADDR_EQUAL(dst, &ip6->ip6_src))
2329 return 0;
2330
2331 /* martian filters on outer source - done in ip6_input */
2332
2333 /* NOTE: the packet may be dropped by uRPF. */
2334
2335 /* return valid bytes length */
2336 return sizeof(*src) + sizeof(*dst);
2337 }
2338
2339 #define IN6_LLTBL_DEFAULT_HSIZE 32
2340 #define IN6_LLTBL_HASH(k, h) \
2341 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2342
2343 /*
2344 * Do actual deallocation of @lle.
2345 * Called by LLE_FREE_LOCKED when number of references
2346 * drops to zero.
2347 */
2348 static void
in6_lltable_destroy_lle(struct llentry * lle)2349 in6_lltable_destroy_lle(struct llentry *lle)
2350 {
2351
2352 KASSERTMSG(lle->la_numheld == 0, "la_numheld=%d", lle->la_numheld);
2353
2354 LLE_WUNLOCK(lle);
2355 LLE_LOCK_DESTROY(lle);
2356 llentry_pool_put(lle);
2357 }
2358
2359 static struct llentry *
in6_lltable_new(const struct in6_addr * addr6,u_int flags)2360 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2361 {
2362 struct llentry *lle;
2363
2364 lle = llentry_pool_get(PR_NOWAIT);
2365 if (lle == NULL) /* NB: caller generates msg */
2366 return NULL;
2367
2368 lle->r_l3addr.addr6 = *addr6;
2369 lle->lle_refcnt = 1;
2370 lle->lle_free = in6_lltable_destroy_lle;
2371 LLE_LOCK_INIT(lle);
2372 callout_init(&lle->lle_timer, CALLOUT_MPSAFE);
2373
2374 return lle;
2375 }
2376
2377 static int
in6_lltable_match_prefix(const struct sockaddr * prefix,const struct sockaddr * mask,u_int flags,struct llentry * lle)2378 in6_lltable_match_prefix(const struct sockaddr *prefix,
2379 const struct sockaddr *mask, u_int flags, struct llentry *lle)
2380 {
2381 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2382 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2383
2384 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6,
2385 &pfx->sin6_addr, &msk->sin6_addr) &&
2386 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)))
2387 return 1;
2388
2389 return 0;
2390 }
2391
2392 static void
in6_lltable_free_entry(struct lltable * llt,struct llentry * lle)2393 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2394 {
2395
2396 LLE_WLOCK_ASSERT(lle);
2397 (void) llentry_free(lle);
2398 }
2399
2400 static int
in6_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr,const struct rtentry * rt)2401 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags,
2402 const struct sockaddr *l3addr, const struct rtentry *rt)
2403 {
2404 char ip6buf[INET6_ADDRSTRLEN];
2405
2406 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2407 int s;
2408 struct ifaddr *ifa;
2409 /*
2410 * Create an ND6 cache for an IPv6 neighbor
2411 * that is not covered by our own prefix.
2412 */
2413 /* XXX ifaof_ifpforaddr should take a const param */
2414 s = pserialize_read_enter();
2415 ifa = ifaof_ifpforaddr(l3addr, ifp);
2416 if (ifa != NULL) {
2417 pserialize_read_exit(s);
2418 return 0;
2419 }
2420 pserialize_read_exit(s);
2421 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2422 IN6_PRINT(ip6buf,
2423 &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2424 return EINVAL;
2425 }
2426 return 0;
2427 }
2428
2429 static inline uint32_t
in6_lltable_hash_dst(const struct in6_addr * dst,uint32_t hsize)2430 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2431 {
2432
2433 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize);
2434 }
2435
2436 static uint32_t
in6_lltable_hash(const struct llentry * lle,uint32_t hsize)2437 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2438 {
2439
2440 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize);
2441 }
2442
2443 static void
in6_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)2444 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2445 {
2446 struct sockaddr_in6 *sin6;
2447
2448 sin6 = (struct sockaddr_in6 *)sa;
2449 bzero(sin6, sizeof(*sin6));
2450 sin6->sin6_family = AF_INET6;
2451 sin6->sin6_len = sizeof(*sin6);
2452 sin6->sin6_addr = lle->r_l3addr.addr6;
2453 }
2454
2455 static inline struct llentry *
in6_lltable_find_dst(struct lltable * llt,const struct in6_addr * dst)2456 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2457 {
2458 struct llentry *lle;
2459 struct llentries *lleh;
2460 u_int hashidx;
2461
2462 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2463 lleh = &llt->lle_head[hashidx];
2464 LIST_FOREACH(lle, lleh, lle_next) {
2465 if (lle->la_flags & LLE_DELETED)
2466 continue;
2467 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2468 break;
2469 }
2470
2471 return lle;
2472 }
2473
2474 static int
in6_lltable_delete(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2475 in6_lltable_delete(struct lltable *llt, u_int flags,
2476 const struct sockaddr *l3addr)
2477 {
2478 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2479 struct llentry *lle;
2480
2481 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
2482 KASSERTMSG(l3addr->sa_family == AF_INET6,
2483 "sin_family %d", l3addr->sa_family);
2484
2485 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2486
2487 if (lle == NULL) {
2488 #ifdef LLTABLE_DEBUG
2489 char buf[64];
2490 sockaddr_format(l3addr, buf, sizeof(buf));
2491 log(LOG_INFO, "%s: cache for %s is not found\n",
2492 __func__, buf);
2493 #endif
2494 return ENOENT;
2495 }
2496
2497 LLE_WLOCK(lle);
2498 #ifdef LLTABLE_DEBUG
2499 {
2500 char buf[64];
2501 sockaddr_format(l3addr, buf, sizeof(buf));
2502 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n",
2503 __func__, buf, lle);
2504 }
2505 #endif
2506 llentry_free(lle);
2507
2508 return 0;
2509 }
2510
2511 static struct llentry *
in6_lltable_create(struct lltable * llt,u_int flags,const struct sockaddr * l3addr,const struct rtentry * rt)2512 in6_lltable_create(struct lltable *llt, u_int flags,
2513 const struct sockaddr *l3addr, const struct rtentry *rt)
2514 {
2515 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2516 struct ifnet *ifp = llt->llt_ifp;
2517 struct llentry *lle;
2518
2519 IF_AFDATA_WLOCK_ASSERT(ifp);
2520 KASSERTMSG(l3addr->sa_family == AF_INET6,
2521 "sin_family %d", l3addr->sa_family);
2522
2523 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2524
2525 if (lle != NULL) {
2526 LLE_WLOCK(lle);
2527 return lle;
2528 }
2529
2530 /*
2531 * A route that covers the given address must have
2532 * been installed 1st because we are doing a resolution,
2533 * verify this.
2534 */
2535 if (!(flags & LLE_IFADDR) &&
2536 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0)
2537 return NULL;
2538
2539 lle = in6_lltable_new(&sin6->sin6_addr, flags);
2540 if (lle == NULL) {
2541 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2542 return NULL;
2543 }
2544 lle->la_flags = flags;
2545 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2546 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen);
2547 lle->la_flags |= LLE_VALID;
2548 }
2549
2550 lltable_link_entry(llt, lle);
2551 LLE_WLOCK(lle);
2552
2553 return lle;
2554 }
2555
2556 static struct llentry *
in6_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2557 in6_lltable_lookup(struct lltable *llt, u_int flags,
2558 const struct sockaddr *l3addr)
2559 {
2560 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2561 struct llentry *lle;
2562
2563 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2564 KASSERTMSG(l3addr->sa_family == AF_INET6,
2565 "sin_family %d", l3addr->sa_family);
2566
2567 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2568
2569 if (lle == NULL)
2570 return NULL;
2571
2572 if (flags & LLE_EXCLUSIVE)
2573 LLE_WLOCK(lle);
2574 else
2575 LLE_RLOCK(lle);
2576 return lle;
2577 }
2578
2579 static int
in6_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct rt_walkarg * w)2580 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2581 struct rt_walkarg *w)
2582 {
2583 struct sockaddr_in6 sin6;
2584
2585 LLTABLE_LOCK_ASSERT();
2586
2587 /* skip deleted entries */
2588 if (lle->la_flags & LLE_DELETED)
2589 return 0;
2590
2591 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0);
2592
2593 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6));
2594 }
2595
2596 static struct lltable *
in6_lltattach(struct ifnet * ifp)2597 in6_lltattach(struct ifnet *ifp)
2598 {
2599 struct lltable *llt;
2600
2601 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2602 llt->llt_af = AF_INET6;
2603 llt->llt_ifp = ifp;
2604
2605 llt->llt_lookup = in6_lltable_lookup;
2606 llt->llt_create = in6_lltable_create;
2607 llt->llt_delete = in6_lltable_delete;
2608 llt->llt_dump_entry = in6_lltable_dump_entry;
2609 llt->llt_hash = in6_lltable_hash;
2610 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2611 llt->llt_free_entry = in6_lltable_free_entry;
2612 llt->llt_match_prefix = in6_lltable_match_prefix;
2613 lltable_link(llt);
2614
2615 return llt;
2616 }
2617
2618 void *
in6_domifattach(struct ifnet * ifp)2619 in6_domifattach(struct ifnet *ifp)
2620 {
2621 struct in6_ifextra *ext;
2622
2623 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO);
2624
2625 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat),
2626 M_IFADDR, M_WAITOK|M_ZERO);
2627
2628 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat),
2629 M_IFADDR, M_WAITOK|M_ZERO);
2630
2631 ext->nd_ifinfo = nd6_ifattach(ifp);
2632 ext->scope6_id = scope6_ifattach(ifp);
2633 ext->lltable = in6_lltattach(ifp);
2634
2635 return ext;
2636 }
2637
2638 void
in6_domifdetach(struct ifnet * ifp,void * aux)2639 in6_domifdetach(struct ifnet *ifp, void *aux)
2640 {
2641 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2642
2643 lltable_free(ext->lltable);
2644 ext->lltable = NULL;
2645 SOFTNET_LOCK_UNLESS_NET_MPSAFE();
2646 nd6_ifdetach(ifp, ext);
2647 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE();
2648 free(ext->in6_ifstat, M_IFADDR);
2649 free(ext->icmp6_ifstat, M_IFADDR);
2650 scope6_ifdetach(ext->scope6_id);
2651 free(ext, M_IFADDR);
2652 }
2653
2654 /*
2655 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address
2656 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2.
2657 */
2658 void
in6_in_2_v4mapin6(const struct in_addr * in,struct in6_addr * in6)2659 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6)
2660 {
2661 in6->s6_addr32[0] = 0;
2662 in6->s6_addr32[1] = 0;
2663 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2664 in6->s6_addr32[3] = in->s_addr;
2665 }
2666
2667 /*
2668 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2669 * v4 mapped addr or v4 compat addr
2670 */
2671 void
in6_sin6_2_sin(struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2672 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2673 {
2674 memset(sin, 0, sizeof(*sin));
2675 sin->sin_len = sizeof(struct sockaddr_in);
2676 sin->sin_family = AF_INET;
2677 sin->sin_port = sin6->sin6_port;
2678 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2679 }
2680
2681 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2682 void
in6_sin_2_v4mapsin6(const struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2683 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2684 {
2685 memset(sin6, 0, sizeof(*sin6));
2686 sin6->sin6_len = sizeof(struct sockaddr_in6);
2687 sin6->sin6_family = AF_INET6;
2688 sin6->sin6_port = sin->sin_port;
2689 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr);
2690 }
2691
2692 /* Convert sockaddr_in6 into sockaddr_in. */
2693 void
in6_sin6_2_sin_in_sock(struct sockaddr * nam)2694 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2695 {
2696 struct sockaddr_in *sin_p;
2697 struct sockaddr_in6 sin6;
2698
2699 /*
2700 * Save original sockaddr_in6 addr and convert it
2701 * to sockaddr_in.
2702 */
2703 sin6 = *(struct sockaddr_in6 *)nam;
2704 sin_p = (struct sockaddr_in *)nam;
2705 in6_sin6_2_sin(sin_p, &sin6);
2706 }
2707
2708 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2709 void
in6_sin_2_v4mapsin6_in_sock(struct sockaddr ** nam)2710 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2711 {
2712 struct sockaddr_in *sin_p;
2713 struct sockaddr_in6 *sin6_p;
2714
2715 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK);
2716 sin_p = (struct sockaddr_in *)*nam;
2717 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2718 free(*nam, M_SONAME);
2719 *nam = sin6tosa(sin6_p);
2720 }
2721