FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6.c
1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in.c 8.2 (Berkeley) 11/15/93
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD: releng/11.0/sys/netinet6/in6.c 302081 2016-06-22 11:29:21Z ae $");
65
66 #include "opt_compat.h"
67 #include "opt_inet.h"
68 #include "opt_inet6.h"
69
70 #include <sys/param.h>
71 #include <sys/eventhandler.h>
72 #include <sys/errno.h>
73 #include <sys/jail.h>
74 #include <sys/malloc.h>
75 #include <sys/socket.h>
76 #include <sys/socketvar.h>
77 #include <sys/sockio.h>
78 #include <sys/systm.h>
79 #include <sys/priv.h>
80 #include <sys/proc.h>
81 #include <sys/time.h>
82 #include <sys/kernel.h>
83 #include <sys/lock.h>
84 #include <sys/rmlock.h>
85 #include <sys/syslog.h>
86
87 #include <net/if.h>
88 #include <net/if_var.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
91 #include <net/if_dl.h>
92 #include <net/vnet.h>
93
94 #include <netinet/in.h>
95 #include <netinet/in_var.h>
96 #include <net/if_llatbl.h>
97 #include <netinet/if_ether.h>
98 #include <netinet/in_systm.h>
99 #include <netinet/ip.h>
100 #include <netinet/in_pcb.h>
101 #include <netinet/ip_carp.h>
102
103 #include <netinet/ip6.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet6/nd6.h>
106 #include <netinet6/mld6_var.h>
107 #include <netinet6/ip6_mroute.h>
108 #include <netinet6/in6_ifattach.h>
109 #include <netinet6/scope6_var.h>
110 #include <netinet6/in6_fib.h>
111 #include <netinet6/in6_pcb.h>
112
113 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
114 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
115
116 /*
117 * Definitions of some costant IP6 addresses.
118 */
119 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
120 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
121 const struct in6_addr in6addr_nodelocal_allnodes =
122 IN6ADDR_NODELOCAL_ALLNODES_INIT;
123 const struct in6_addr in6addr_linklocal_allnodes =
124 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
125 const struct in6_addr in6addr_linklocal_allrouters =
126 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
127 const struct in6_addr in6addr_linklocal_allv2routers =
128 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
129
130 const struct in6_addr in6mask0 = IN6MASK0;
131 const struct in6_addr in6mask32 = IN6MASK32;
132 const struct in6_addr in6mask64 = IN6MASK64;
133 const struct in6_addr in6mask96 = IN6MASK96;
134 const struct in6_addr in6mask128 = IN6MASK128;
135
136 const struct sockaddr_in6 sa6_any =
137 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
138
139 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
140 struct in6_aliasreq *, int);
141 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
142
143 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
144 struct in6_ifaddr *, int);
145 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
146 struct in6_aliasreq *, int flags);
147 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
148 struct in6_ifaddr *, int, int);
149 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
150 struct in6_ifaddr *, int);
151
152 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
153 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
154
155
156 void
157 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
158 {
159 struct sockaddr_dl gateway;
160 struct sockaddr_in6 mask, addr;
161 struct rtentry rt;
162
163 /*
164 * initialize for rtmsg generation
165 */
166 bzero(&gateway, sizeof(gateway));
167 gateway.sdl_len = sizeof(gateway);
168 gateway.sdl_family = AF_LINK;
169
170 bzero(&rt, sizeof(rt));
171 rt.rt_gateway = (struct sockaddr *)&gateway;
172 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
173 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
174 rt_mask(&rt) = (struct sockaddr *)&mask;
175 rt_key(&rt) = (struct sockaddr *)&addr;
176 rt.rt_flags = RTF_HOST | RTF_STATIC;
177 if (cmd == RTM_ADD)
178 rt.rt_flags |= RTF_UP;
179 /* Announce arrival of local address to all FIBs. */
180 rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
181 }
182
183 int
184 in6_mask2len(struct in6_addr *mask, u_char *lim0)
185 {
186 int x = 0, y;
187 u_char *lim = lim0, *p;
188
189 /* ignore the scope_id part */
190 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
191 lim = (u_char *)mask + sizeof(*mask);
192 for (p = (u_char *)mask; p < lim; x++, p++) {
193 if (*p != 0xff)
194 break;
195 }
196 y = 0;
197 if (p < lim) {
198 for (y = 0; y < 8; y++) {
199 if ((*p & (0x80 >> y)) == 0)
200 break;
201 }
202 }
203
204 /*
205 * when the limit pointer is given, do a stricter check on the
206 * remaining bits.
207 */
208 if (p < lim) {
209 if (y != 0 && (*p & (0x00ff >> y)) != 0)
210 return (-1);
211 for (p = p + 1; p < lim; p++)
212 if (*p != 0)
213 return (-1);
214 }
215
216 return x * 8 + y;
217 }
218
219 #ifdef COMPAT_FREEBSD32
220 struct in6_ndifreq32 {
221 char ifname[IFNAMSIZ];
222 uint32_t ifindex;
223 };
224 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
225 #endif
226
227 int
228 in6_control(struct socket *so, u_long cmd, caddr_t data,
229 struct ifnet *ifp, struct thread *td)
230 {
231 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
232 struct in6_ifaddr *ia = NULL;
233 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
234 struct sockaddr_in6 *sa6;
235 int carp_attached = 0;
236 int error;
237 u_long ocmd = cmd;
238
239 /*
240 * Compat to make pre-10.x ifconfig(8) operable.
241 */
242 if (cmd == OSIOCAIFADDR_IN6)
243 cmd = SIOCAIFADDR_IN6;
244
245 switch (cmd) {
246 case SIOCGETSGCNT_IN6:
247 case SIOCGETMIFCNT_IN6:
248 /*
249 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
250 * We cannot see how that would be needed, so do not adjust the
251 * KPI blindly; more likely should clean up the IPv4 variant.
252 */
253 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
254 }
255
256 switch (cmd) {
257 case SIOCAADDRCTL_POLICY:
258 case SIOCDADDRCTL_POLICY:
259 if (td != NULL) {
260 error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
261 if (error)
262 return (error);
263 }
264 return (in6_src_ioctl(cmd, data));
265 }
266
267 if (ifp == NULL)
268 return (EOPNOTSUPP);
269
270 switch (cmd) {
271 case SIOCSNDFLUSH_IN6:
272 case SIOCSPFXFLUSH_IN6:
273 case SIOCSRTRFLUSH_IN6:
274 case SIOCSDEFIFACE_IN6:
275 case SIOCSIFINFO_FLAGS:
276 case SIOCSIFINFO_IN6:
277 if (td != NULL) {
278 error = priv_check(td, PRIV_NETINET_ND6);
279 if (error)
280 return (error);
281 }
282 /* FALLTHROUGH */
283 case OSIOCGIFINFO_IN6:
284 case SIOCGIFINFO_IN6:
285 case SIOCGNBRINFO_IN6:
286 case SIOCGDEFIFACE_IN6:
287 return (nd6_ioctl(cmd, data, ifp));
288
289 #ifdef COMPAT_FREEBSD32
290 case SIOCGDEFIFACE32_IN6:
291 {
292 struct in6_ndifreq ndif;
293 struct in6_ndifreq32 *ndif32;
294
295 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
296 ifp);
297 if (error)
298 return (error);
299 ndif32 = (struct in6_ndifreq32 *)data;
300 ndif32->ifindex = ndif.ifindex;
301 return (0);
302 }
303 #endif
304 }
305
306 switch (cmd) {
307 case SIOCSIFPREFIX_IN6:
308 case SIOCDIFPREFIX_IN6:
309 case SIOCAIFPREFIX_IN6:
310 case SIOCCIFPREFIX_IN6:
311 case SIOCSGIFPREFIX_IN6:
312 case SIOCGIFPREFIX_IN6:
313 log(LOG_NOTICE,
314 "prefix ioctls are now invalidated. "
315 "please use ifconfig.\n");
316 return (EOPNOTSUPP);
317 }
318
319 switch (cmd) {
320 case SIOCSSCOPE6:
321 if (td != NULL) {
322 error = priv_check(td, PRIV_NETINET_SCOPE6);
323 if (error)
324 return (error);
325 }
326 /* FALLTHROUGH */
327 case SIOCGSCOPE6:
328 case SIOCGSCOPE6DEF:
329 return (scope6_ioctl(cmd, data, ifp));
330 }
331
332 /*
333 * Find address for this interface, if it exists.
334 *
335 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
336 * only, and used the first interface address as the target of other
337 * operations (without checking ifra_addr). This was because netinet
338 * code/API assumed at most 1 interface address per interface.
339 * Since IPv6 allows a node to assign multiple addresses
340 * on a single interface, we almost always look and check the
341 * presence of ifra_addr, and reject invalid ones here.
342 * It also decreases duplicated code among SIOC*_IN6 operations.
343 */
344 switch (cmd) {
345 case SIOCAIFADDR_IN6:
346 case SIOCSIFPHYADDR_IN6:
347 sa6 = &ifra->ifra_addr;
348 break;
349 case SIOCSIFADDR_IN6:
350 case SIOCGIFADDR_IN6:
351 case SIOCSIFDSTADDR_IN6:
352 case SIOCSIFNETMASK_IN6:
353 case SIOCGIFDSTADDR_IN6:
354 case SIOCGIFNETMASK_IN6:
355 case SIOCDIFADDR_IN6:
356 case SIOCGIFPSRCADDR_IN6:
357 case SIOCGIFPDSTADDR_IN6:
358 case SIOCGIFAFLAG_IN6:
359 case SIOCSNDFLUSH_IN6:
360 case SIOCSPFXFLUSH_IN6:
361 case SIOCSRTRFLUSH_IN6:
362 case SIOCGIFALIFETIME_IN6:
363 case SIOCGIFSTAT_IN6:
364 case SIOCGIFSTAT_ICMP6:
365 sa6 = &ifr->ifr_addr;
366 break;
367 case SIOCSIFADDR:
368 case SIOCSIFBRDADDR:
369 case SIOCSIFDSTADDR:
370 case SIOCSIFNETMASK:
371 /*
372 * Although we should pass any non-INET6 ioctl requests
373 * down to driver, we filter some legacy INET requests.
374 * Drivers trust SIOCSIFADDR et al to come from an already
375 * privileged layer, and do not perform any credentials
376 * checks or input validation.
377 */
378 return (EINVAL);
379 default:
380 sa6 = NULL;
381 break;
382 }
383 if (sa6 && sa6->sin6_family == AF_INET6) {
384 if (sa6->sin6_scope_id != 0)
385 error = sa6_embedscope(sa6, 0);
386 else
387 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
388 if (error != 0)
389 return (error);
390 if (td != NULL && (error = prison_check_ip6(td->td_ucred,
391 &sa6->sin6_addr)) != 0)
392 return (error);
393 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
394 } else
395 ia = NULL;
396
397 switch (cmd) {
398 case SIOCSIFADDR_IN6:
399 case SIOCSIFDSTADDR_IN6:
400 case SIOCSIFNETMASK_IN6:
401 /*
402 * Since IPv6 allows a node to assign multiple addresses
403 * on a single interface, SIOCSIFxxx ioctls are deprecated.
404 */
405 /* we decided to obsolete this command (20000704) */
406 error = EINVAL;
407 goto out;
408
409 case SIOCDIFADDR_IN6:
410 /*
411 * for IPv4, we look for existing in_ifaddr here to allow
412 * "ifconfig if0 delete" to remove the first IPv4 address on
413 * the interface. For IPv6, as the spec allows multiple
414 * interface address from the day one, we consider "remove the
415 * first one" semantics to be not preferable.
416 */
417 if (ia == NULL) {
418 error = EADDRNOTAVAIL;
419 goto out;
420 }
421 /* FALLTHROUGH */
422 case SIOCAIFADDR_IN6:
423 /*
424 * We always require users to specify a valid IPv6 address for
425 * the corresponding operation.
426 */
427 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
428 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
429 error = EAFNOSUPPORT;
430 goto out;
431 }
432
433 if (td != NULL) {
434 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
435 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
436 if (error)
437 goto out;
438 }
439 /* FALLTHROUGH */
440 case SIOCGIFSTAT_IN6:
441 case SIOCGIFSTAT_ICMP6:
442 if (ifp->if_afdata[AF_INET6] == NULL) {
443 error = EPFNOSUPPORT;
444 goto out;
445 }
446 break;
447
448 case SIOCGIFADDR_IN6:
449 /* This interface is basically deprecated. use SIOCGIFCONF. */
450 /* FALLTHROUGH */
451 case SIOCGIFAFLAG_IN6:
452 case SIOCGIFNETMASK_IN6:
453 case SIOCGIFDSTADDR_IN6:
454 case SIOCGIFALIFETIME_IN6:
455 /* must think again about its semantics */
456 if (ia == NULL) {
457 error = EADDRNOTAVAIL;
458 goto out;
459 }
460 break;
461 }
462
463 switch (cmd) {
464 case SIOCGIFADDR_IN6:
465 ifr->ifr_addr = ia->ia_addr;
466 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
467 goto out;
468 break;
469
470 case SIOCGIFDSTADDR_IN6:
471 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
472 error = EINVAL;
473 goto out;
474 }
475 /*
476 * XXX: should we check if ifa_dstaddr is NULL and return
477 * an error?
478 */
479 ifr->ifr_dstaddr = ia->ia_dstaddr;
480 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
481 goto out;
482 break;
483
484 case SIOCGIFNETMASK_IN6:
485 ifr->ifr_addr = ia->ia_prefixmask;
486 break;
487
488 case SIOCGIFAFLAG_IN6:
489 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
490 break;
491
492 case SIOCGIFSTAT_IN6:
493 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
494 ifp->if_afdata[AF_INET6])->in6_ifstat,
495 &ifr->ifr_ifru.ifru_stat,
496 sizeof(struct in6_ifstat) / sizeof(uint64_t));
497 break;
498
499 case SIOCGIFSTAT_ICMP6:
500 COUNTER_ARRAY_COPY(((struct in6_ifextra *)
501 ifp->if_afdata[AF_INET6])->icmp6_ifstat,
502 &ifr->ifr_ifru.ifru_icmp6stat,
503 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
504 break;
505
506 case SIOCGIFALIFETIME_IN6:
507 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
508 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
509 time_t maxexpire;
510 struct in6_addrlifetime *retlt =
511 &ifr->ifr_ifru.ifru_lifetime;
512
513 /*
514 * XXX: adjust expiration time assuming time_t is
515 * signed.
516 */
517 maxexpire = (-1) &
518 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
519 if (ia->ia6_lifetime.ia6t_vltime <
520 maxexpire - ia->ia6_updatetime) {
521 retlt->ia6t_expire = ia->ia6_updatetime +
522 ia->ia6_lifetime.ia6t_vltime;
523 } else
524 retlt->ia6t_expire = maxexpire;
525 }
526 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
527 time_t maxexpire;
528 struct in6_addrlifetime *retlt =
529 &ifr->ifr_ifru.ifru_lifetime;
530
531 /*
532 * XXX: adjust expiration time assuming time_t is
533 * signed.
534 */
535 maxexpire = (-1) &
536 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
537 if (ia->ia6_lifetime.ia6t_pltime <
538 maxexpire - ia->ia6_updatetime) {
539 retlt->ia6t_preferred = ia->ia6_updatetime +
540 ia->ia6_lifetime.ia6t_pltime;
541 } else
542 retlt->ia6t_preferred = maxexpire;
543 }
544 break;
545
546 case SIOCAIFADDR_IN6:
547 {
548 struct nd_prefixctl pr0;
549 struct nd_prefix *pr;
550
551 /*
552 * first, make or update the interface address structure,
553 * and link it to the list.
554 */
555 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
556 goto out;
557 if (ia != NULL)
558 ifa_free(&ia->ia_ifa);
559 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
560 == NULL) {
561 /*
562 * this can happen when the user specify the 0 valid
563 * lifetime.
564 */
565 break;
566 }
567
568 if (cmd == ocmd && ifra->ifra_vhid > 0) {
569 if (carp_attach_p != NULL)
570 error = (*carp_attach_p)(&ia->ia_ifa,
571 ifra->ifra_vhid);
572 else
573 error = EPROTONOSUPPORT;
574 if (error)
575 goto out;
576 else
577 carp_attached = 1;
578 }
579
580 /*
581 * then, make the prefix on-link on the interface.
582 * XXX: we'd rather create the prefix before the address, but
583 * we need at least one address to install the corresponding
584 * interface route, so we configure the address first.
585 */
586
587 /*
588 * convert mask to prefix length (prefixmask has already
589 * been validated in in6_update_ifa().
590 */
591 bzero(&pr0, sizeof(pr0));
592 pr0.ndpr_ifp = ifp;
593 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
594 NULL);
595 if (pr0.ndpr_plen == 128) {
596 /* we don't need to install a host route. */
597 goto aifaddr_out;
598 }
599 pr0.ndpr_prefix = ifra->ifra_addr;
600 /* apply the mask for safety. */
601 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
602 &ifra->ifra_prefixmask.sin6_addr);
603
604 /*
605 * XXX: since we don't have an API to set prefix (not address)
606 * lifetimes, we just use the same lifetimes as addresses.
607 * The (temporarily) installed lifetimes can be overridden by
608 * later advertised RAs (when accept_rtadv is non 0), which is
609 * an intended behavior.
610 */
611 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
612 pr0.ndpr_raf_auto =
613 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
614 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
615 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
616
617 /* add the prefix if not yet. */
618 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
619 /*
620 * nd6_prelist_add will install the corresponding
621 * interface route.
622 */
623 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
624 if (carp_attached)
625 (*carp_detach_p)(&ia->ia_ifa);
626 goto out;
627 }
628 }
629
630 /* relate the address to the prefix */
631 if (ia->ia6_ndpr == NULL) {
632 ia->ia6_ndpr = pr;
633 pr->ndpr_refcnt++;
634
635 /*
636 * If this is the first autoconf address from the
637 * prefix, create a temporary address as well
638 * (when required).
639 */
640 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
641 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
642 int e;
643 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
644 log(LOG_NOTICE, "in6_control: failed "
645 "to create a temporary address, "
646 "errno=%d\n", e);
647 }
648 }
649 }
650
651 /*
652 * this might affect the status of autoconfigured addresses,
653 * that is, this address might make other addresses detached.
654 */
655 pfxlist_onlink_check();
656
657 aifaddr_out:
658 /*
659 * Try to clear the flag when a new IPv6 address is added
660 * onto an IFDISABLED interface and it succeeds.
661 */
662 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
663 struct in6_ndireq nd;
664
665 memset(&nd, 0, sizeof(nd));
666 nd.ndi.flags = ND_IFINFO(ifp)->flags;
667 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
668 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
669 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
670 "SIOCSIFINFO_FLAGS for -ifdisabled "
671 "failed.");
672 /*
673 * Ignore failure of clearing the flag intentionally.
674 * The failure means address duplication was detected.
675 */
676 }
677 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
678 break;
679 }
680
681 case SIOCDIFADDR_IN6:
682 {
683 struct nd_prefix *pr;
684
685 /*
686 * If the address being deleted is the only one that owns
687 * the corresponding prefix, expire the prefix as well.
688 * XXX: theoretically, we don't have to worry about such
689 * relationship, since we separate the address management
690 * and the prefix management. We do this, however, to provide
691 * as much backward compatibility as possible in terms of
692 * the ioctl operation.
693 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
694 */
695 pr = ia->ia6_ndpr;
696 in6_purgeaddr(&ia->ia_ifa);
697 if (pr && pr->ndpr_refcnt == 0)
698 prelist_remove(pr);
699 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
700 break;
701 }
702
703 default:
704 if (ifp->if_ioctl == NULL) {
705 error = EOPNOTSUPP;
706 goto out;
707 }
708 error = (*ifp->if_ioctl)(ifp, cmd, data);
709 goto out;
710 }
711
712 error = 0;
713 out:
714 if (ia != NULL)
715 ifa_free(&ia->ia_ifa);
716 return (error);
717 }
718
719
720 /*
721 * Join necessary multicast groups. Factored out from in6_update_ifa().
722 * This entire work should only be done once, for the default FIB.
723 */
724 static int
725 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
726 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
727 {
728 char ip6buf[INET6_ADDRSTRLEN];
729 struct in6_addr mltaddr;
730 struct in6_multi_mship *imm;
731 int delay, error;
732
733 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
734
735 /* Join solicited multicast addr for new host id. */
736 bzero(&mltaddr, sizeof(struct in6_addr));
737 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
738 mltaddr.s6_addr32[2] = htonl(1);
739 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
740 mltaddr.s6_addr8[12] = 0xff;
741 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
742 /* XXX: should not happen */
743 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
744 goto cleanup;
745 }
746 delay = error = 0;
747 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
748 /*
749 * We need a random delay for DAD on the address being
750 * configured. It also means delaying transmission of the
751 * corresponding MLD report to avoid report collision.
752 * [RFC 4861, Section 6.3.7]
753 */
754 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
755 }
756 imm = in6_joingroup(ifp, &mltaddr, &error, delay);
757 if (imm == NULL) {
758 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
759 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
760 if_name(ifp), error));
761 goto cleanup;
762 }
763 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
764 *in6m_sol = imm->i6mm_maddr;
765
766 /*
767 * Join link-local all-nodes address.
768 */
769 mltaddr = in6addr_linklocal_allnodes;
770 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
771 goto cleanup; /* XXX: should not fail */
772
773 imm = in6_joingroup(ifp, &mltaddr, &error, 0);
774 if (imm == NULL) {
775 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
776 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
777 if_name(ifp), error));
778 goto cleanup;
779 }
780 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
781
782 /*
783 * Join node information group address.
784 */
785 delay = 0;
786 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
787 /*
788 * The spec does not say anything about delay for this group,
789 * but the same logic should apply.
790 */
791 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
792 }
793 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
794 /* XXX jinmei */
795 imm = in6_joingroup(ifp, &mltaddr, &error, delay);
796 if (imm == NULL)
797 nd6log((LOG_WARNING,
798 "%s: in6_joingroup failed for %s on %s "
799 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
800 &mltaddr), if_name(ifp), error));
801 /* XXX not very fatal, go on... */
802 else
803 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
804 }
805 if (V_icmp6_nodeinfo_oldmcprefix &&
806 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
807 imm = in6_joingroup(ifp, &mltaddr, &error, delay);
808 if (imm == NULL)
809 nd6log((LOG_WARNING,
810 "%s: in6_joingroup failed for %s on %s "
811 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
812 &mltaddr), if_name(ifp), error));
813 /* XXX not very fatal, go on... */
814 else
815 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816 }
817
818 /*
819 * Join interface-local all-nodes address.
820 * (ff01::1%ifN, and ff01::%ifN/32)
821 */
822 mltaddr = in6addr_nodelocal_allnodes;
823 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
824 goto cleanup; /* XXX: should not fail */
825
826 imm = in6_joingroup(ifp, &mltaddr, &error, 0);
827 if (imm == NULL) {
828 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
829 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
830 &mltaddr), if_name(ifp), error));
831 goto cleanup;
832 }
833 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
834
835 cleanup:
836 return (error);
837 }
838
839 /*
840 * Update parameters of an IPv6 interface address.
841 * If necessary, a new entry is created and linked into address chains.
842 * This function is separated from in6_control().
843 */
844 int
845 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
846 struct in6_ifaddr *ia, int flags)
847 {
848 int error, hostIsNew = 0;
849
850 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
851 return (error);
852
853 if (ia == NULL) {
854 hostIsNew = 1;
855 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
856 return (ENOBUFS);
857 }
858
859 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
860 if (error != 0) {
861 if (hostIsNew != 0) {
862 in6_unlink_ifa(ia, ifp);
863 ifa_free(&ia->ia_ifa);
864 }
865 return (error);
866 }
867
868 if (hostIsNew)
869 error = in6_broadcast_ifa(ifp, ifra, ia, flags);
870
871 return (error);
872 }
873
874 /*
875 * Fill in basic IPv6 address request info.
876 */
877 void
878 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
879 const struct in6_addr *mask)
880 {
881
882 memset(ifra, 0, sizeof(struct in6_aliasreq));
883
884 ifra->ifra_addr.sin6_family = AF_INET6;
885 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
886 if (addr != NULL)
887 ifra->ifra_addr.sin6_addr = *addr;
888
889 ifra->ifra_prefixmask.sin6_family = AF_INET6;
890 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
891 if (mask != NULL)
892 ifra->ifra_prefixmask.sin6_addr = *mask;
893 }
894
895 static int
896 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
897 struct in6_ifaddr *ia, int flags)
898 {
899 int plen = -1;
900 struct sockaddr_in6 dst6;
901 struct in6_addrlifetime *lt;
902 char ip6buf[INET6_ADDRSTRLEN];
903
904 /* Validate parameters */
905 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
906 return (EINVAL);
907
908 /*
909 * The destination address for a p2p link must have a family
910 * of AF_UNSPEC or AF_INET6.
911 */
912 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
913 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
914 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
915 return (EAFNOSUPPORT);
916
917 /*
918 * Validate address
919 */
920 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
921 ifra->ifra_addr.sin6_family != AF_INET6)
922 return (EINVAL);
923
924 /*
925 * validate ifra_prefixmask. don't check sin6_family, netmask
926 * does not carry fields other than sin6_len.
927 */
928 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
929 return (EINVAL);
930 /*
931 * Because the IPv6 address architecture is classless, we require
932 * users to specify a (non 0) prefix length (mask) for a new address.
933 * We also require the prefix (when specified) mask is valid, and thus
934 * reject a non-consecutive mask.
935 */
936 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
937 return (EINVAL);
938 if (ifra->ifra_prefixmask.sin6_len != 0) {
939 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
940 (u_char *)&ifra->ifra_prefixmask +
941 ifra->ifra_prefixmask.sin6_len);
942 if (plen <= 0)
943 return (EINVAL);
944 } else {
945 /*
946 * In this case, ia must not be NULL. We just use its prefix
947 * length.
948 */
949 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
950 }
951 /*
952 * If the destination address on a p2p interface is specified,
953 * and the address is a scoped one, validate/set the scope
954 * zone identifier.
955 */
956 dst6 = ifra->ifra_dstaddr;
957 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
958 (dst6.sin6_family == AF_INET6)) {
959 struct in6_addr in6_tmp;
960 u_int32_t zoneid;
961
962 in6_tmp = dst6.sin6_addr;
963 if (in6_setscope(&in6_tmp, ifp, &zoneid))
964 return (EINVAL); /* XXX: should be impossible */
965
966 if (dst6.sin6_scope_id != 0) {
967 if (dst6.sin6_scope_id != zoneid)
968 return (EINVAL);
969 } else /* user omit to specify the ID. */
970 dst6.sin6_scope_id = zoneid;
971
972 /* convert into the internal form */
973 if (sa6_embedscope(&dst6, 0))
974 return (EINVAL); /* XXX: should be impossible */
975 }
976 /* Modify original ifra_dstaddr to reflect changes */
977 ifra->ifra_dstaddr = dst6;
978
979 /*
980 * The destination address can be specified only for a p2p or a
981 * loopback interface. If specified, the corresponding prefix length
982 * must be 128.
983 */
984 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
985 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
986 /* XXX: noisy message */
987 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
988 "be specified for a p2p or a loopback IF only\n"));
989 return (EINVAL);
990 }
991 if (plen != 128) {
992 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
993 "be 128 when dstaddr is specified\n"));
994 return (EINVAL);
995 }
996 }
997 /* lifetime consistency check */
998 lt = &ifra->ifra_lifetime;
999 if (lt->ia6t_pltime > lt->ia6t_vltime)
1000 return (EINVAL);
1001 if (lt->ia6t_vltime == 0) {
1002 /*
1003 * the following log might be noisy, but this is a typical
1004 * configuration mistake or a tool's bug.
1005 */
1006 nd6log((LOG_INFO,
1007 "in6_update_ifa: valid lifetime is 0 for %s\n",
1008 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1009
1010 if (ia == NULL)
1011 return (0); /* there's nothing to do */
1012 }
1013
1014 /* Check prefix mask */
1015 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1016 /*
1017 * We prohibit changing the prefix length of an existing
1018 * address, because
1019 * + such an operation should be rare in IPv6, and
1020 * + the operation would confuse prefix management.
1021 */
1022 if (ia->ia_prefixmask.sin6_len != 0 &&
1023 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1024 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1025 "of an existing %s address should not be changed\n",
1026 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1027
1028 return (EINVAL);
1029 }
1030 }
1031
1032 return (0);
1033 }
1034
1035
1036 /*
1037 * Allocate a new ifaddr and link it into chains.
1038 */
1039 static struct in6_ifaddr *
1040 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1041 {
1042 struct in6_ifaddr *ia;
1043
1044 /*
1045 * When in6_alloc_ifa() is called in a process of a received
1046 * RA, it is called under an interrupt context. So, we should
1047 * call malloc with M_NOWAIT.
1048 */
1049 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1050 if (ia == NULL)
1051 return (NULL);
1052 LIST_INIT(&ia->ia6_memberships);
1053 /* Initialize the address and masks, and put time stamp */
1054 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1055 ia->ia_addr.sin6_family = AF_INET6;
1056 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1057 /* XXX: Can we assign ,sin6_addr and skip the rest? */
1058 ia->ia_addr = ifra->ifra_addr;
1059 ia->ia6_createtime = time_uptime;
1060 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1061 /*
1062 * Some functions expect that ifa_dstaddr is not
1063 * NULL for p2p interfaces.
1064 */
1065 ia->ia_ifa.ifa_dstaddr =
1066 (struct sockaddr *)&ia->ia_dstaddr;
1067 } else {
1068 ia->ia_ifa.ifa_dstaddr = NULL;
1069 }
1070
1071 /* set prefix mask if any */
1072 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1073 if (ifra->ifra_prefixmask.sin6_len != 0) {
1074 ia->ia_prefixmask.sin6_family = AF_INET6;
1075 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1076 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1077 }
1078
1079 ia->ia_ifp = ifp;
1080 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1081 IF_ADDR_WLOCK(ifp);
1082 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1083 IF_ADDR_WUNLOCK(ifp);
1084
1085 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1086 IN6_IFADDR_WLOCK();
1087 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1088 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1089 IN6_IFADDR_WUNLOCK();
1090
1091 return (ia);
1092 }
1093
1094 /*
1095 * Update/configure interface address parameters:
1096 *
1097 * 1) Update lifetime
1098 * 2) Update interface metric ad flags
1099 * 3) Notify other subsystems
1100 */
1101 static int
1102 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1103 struct in6_ifaddr *ia, int hostIsNew, int flags)
1104 {
1105 int error;
1106
1107 /* update timestamp */
1108 ia->ia6_updatetime = time_uptime;
1109
1110 /*
1111 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1112 * to see if the address is deprecated or invalidated, but initialize
1113 * these members for applications.
1114 */
1115 ia->ia6_lifetime = ifra->ifra_lifetime;
1116 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1117 ia->ia6_lifetime.ia6t_expire =
1118 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1119 } else
1120 ia->ia6_lifetime.ia6t_expire = 0;
1121 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1122 ia->ia6_lifetime.ia6t_preferred =
1123 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1124 } else
1125 ia->ia6_lifetime.ia6t_preferred = 0;
1126
1127 /*
1128 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1129 * userland, make it deprecated.
1130 */
1131 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1132 ia->ia6_lifetime.ia6t_pltime = 0;
1133 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1134 }
1135
1136 /*
1137 * configure address flags.
1138 */
1139 ia->ia6_flags = ifra->ifra_flags;
1140
1141 /*
1142 * Make the address tentative before joining multicast addresses,
1143 * so that corresponding MLD responses would not have a tentative
1144 * source address.
1145 */
1146 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1147
1148 /*
1149 * DAD should be performed for an new address or addresses on
1150 * an interface with ND6_IFF_IFDISABLED.
1151 */
1152 if (in6if_do_dad(ifp) &&
1153 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1154 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1155
1156 /* notify other subsystems */
1157 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1158
1159 return (error);
1160 }
1161
1162 /*
1163 * Do link-level ifa job:
1164 * 1) Add lle entry for added address
1165 * 2) Notifies routing socket users about new address
1166 * 3) join appropriate multicast group
1167 * 4) start DAD if enabled
1168 */
1169 static int
1170 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1171 struct in6_ifaddr *ia, int flags)
1172 {
1173 struct in6_multi *in6m_sol;
1174 int error = 0;
1175
1176 /* Add local address to lltable, if necessary (ex. on p2p link). */
1177 if ((error = nd6_add_ifa_lle(ia)) != 0) {
1178 in6_purgeaddr(&ia->ia_ifa);
1179 ifa_free(&ia->ia_ifa);
1180 return (error);
1181 }
1182
1183 /* Join necessary multicast groups. */
1184 in6m_sol = NULL;
1185 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1186 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1187 if (error != 0) {
1188 in6_purgeaddr(&ia->ia_ifa);
1189 ifa_free(&ia->ia_ifa);
1190 return (error);
1191 }
1192 }
1193
1194 /* Perform DAD, if the address is TENTATIVE. */
1195 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1196 int delay, mindelay, maxdelay;
1197
1198 delay = 0;
1199 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1200 /*
1201 * We need to impose a delay before sending an NS
1202 * for DAD. Check if we also needed a delay for the
1203 * corresponding MLD message. If we did, the delay
1204 * should be larger than the MLD delay (this could be
1205 * relaxed a bit, but this simple logic is at least
1206 * safe).
1207 * XXX: Break data hiding guidelines and look at
1208 * state for the solicited multicast group.
1209 */
1210 mindelay = 0;
1211 if (in6m_sol != NULL &&
1212 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1213 mindelay = in6m_sol->in6m_timer;
1214 }
1215 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1216 if (maxdelay - mindelay == 0)
1217 delay = 0;
1218 else {
1219 delay =
1220 (arc4random() % (maxdelay - mindelay)) +
1221 mindelay;
1222 }
1223 }
1224 nd6_dad_start((struct ifaddr *)ia, delay);
1225 }
1226
1227 in6_newaddrmsg(ia, RTM_ADD);
1228 ifa_free(&ia->ia_ifa);
1229 return (error);
1230 }
1231
1232 void
1233 in6_purgeaddr(struct ifaddr *ifa)
1234 {
1235 struct ifnet *ifp = ifa->ifa_ifp;
1236 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1237 struct in6_multi_mship *imm;
1238 int plen, error;
1239
1240 if (ifa->ifa_carp)
1241 (*carp_detach_p)(ifa);
1242
1243 /*
1244 * Remove the loopback route to the interface address.
1245 * The check for the current setting of "nd6_useloopback"
1246 * is not needed.
1247 */
1248 if (ia->ia_flags & IFA_RTSELF) {
1249 error = ifa_del_loopback_route((struct ifaddr *)ia,
1250 (struct sockaddr *)&ia->ia_addr);
1251 if (error == 0)
1252 ia->ia_flags &= ~IFA_RTSELF;
1253 }
1254
1255 /* stop DAD processing */
1256 nd6_dad_stop(ifa);
1257
1258 /* Leave multicast groups. */
1259 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1260 LIST_REMOVE(imm, i6mm_chain);
1261 in6_leavegroup(imm);
1262 }
1263 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1264 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1265 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1266 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0));
1267 if (error != 0)
1268 log(LOG_INFO, "%s: err=%d, destination address delete "
1269 "failed\n", __func__, error);
1270 ia->ia_flags &= ~IFA_ROUTE;
1271 }
1272
1273 in6_newaddrmsg(ia, RTM_DELETE);
1274 in6_unlink_ifa(ia, ifp);
1275 }
1276
1277 static void
1278 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1279 {
1280 char ip6buf[INET6_ADDRSTRLEN];
1281 int remove_lle;
1282
1283 IF_ADDR_WLOCK(ifp);
1284 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1285 IF_ADDR_WUNLOCK(ifp);
1286 ifa_free(&ia->ia_ifa); /* if_addrhead */
1287
1288 /*
1289 * Defer the release of what might be the last reference to the
1290 * in6_ifaddr so that it can't be freed before the remainder of the
1291 * cleanup.
1292 */
1293 IN6_IFADDR_WLOCK();
1294 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1295 LIST_REMOVE(ia, ia6_hash);
1296 IN6_IFADDR_WUNLOCK();
1297
1298 /*
1299 * Release the reference to the base prefix. There should be a
1300 * positive reference.
1301 */
1302 remove_lle = 0;
1303 if (ia->ia6_ndpr == NULL) {
1304 nd6log((LOG_NOTICE,
1305 "in6_unlink_ifa: autoconf'ed address "
1306 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1307 } else {
1308 ia->ia6_ndpr->ndpr_refcnt--;
1309 /* Do not delete lles within prefix if refcont != 0 */
1310 if (ia->ia6_ndpr->ndpr_refcnt == 0)
1311 remove_lle = 1;
1312 ia->ia6_ndpr = NULL;
1313 }
1314
1315 nd6_rem_ifa_lle(ia, remove_lle);
1316
1317 /*
1318 * Also, if the address being removed is autoconf'ed, call
1319 * pfxlist_onlink_check() since the release might affect the status of
1320 * other (detached) addresses.
1321 */
1322 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1323 pfxlist_onlink_check();
1324 }
1325 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1326 }
1327
1328 /*
1329 * Notifies other subsystems about address change/arrival:
1330 * 1) Notifies device handler on the first IPv6 address assignment
1331 * 2) Handle routing table changes for P2P links and route
1332 * 3) Handle routing table changes for address host route
1333 */
1334 static int
1335 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1336 struct in6_aliasreq *ifra, int hostIsNew)
1337 {
1338 int error = 0, plen, ifacount = 0;
1339 struct ifaddr *ifa;
1340 struct sockaddr_in6 *pdst;
1341 char ip6buf[INET6_ADDRSTRLEN];
1342
1343 /*
1344 * Give the interface a chance to initialize
1345 * if this is its first address,
1346 */
1347 if (hostIsNew != 0) {
1348 IF_ADDR_RLOCK(ifp);
1349 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1350 if (ifa->ifa_addr->sa_family != AF_INET6)
1351 continue;
1352 ifacount++;
1353 }
1354 IF_ADDR_RUNLOCK(ifp);
1355 }
1356
1357 if (ifacount <= 1 && ifp->if_ioctl) {
1358 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1359 if (error)
1360 return (error);
1361 }
1362
1363 /*
1364 * If a new destination address is specified, scrub the old one and
1365 * install the new destination. Note that the interface must be
1366 * p2p or loopback.
1367 */
1368 pdst = &ifra->ifra_dstaddr;
1369 if (pdst->sin6_family == AF_INET6 &&
1370 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1371 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1372 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1373 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1374 "remove a route to the old destination: %s\n",
1375 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1376 /* proceed anyway... */
1377 } else
1378 ia->ia_flags &= ~IFA_ROUTE;
1379 ia->ia_dstaddr = *pdst;
1380 }
1381
1382 /*
1383 * If a new destination address is specified for a point-to-point
1384 * interface, install a route to the destination as an interface
1385 * direct route.
1386 * XXX: the logic below rejects assigning multiple addresses on a p2p
1387 * interface that share the same destination.
1388 */
1389 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1390 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1391 ia->ia_dstaddr.sin6_family == AF_INET6) {
1392 int rtflags = RTF_UP | RTF_HOST;
1393 /*
1394 * Handle the case for ::1 .
1395 */
1396 if (ifp->if_flags & IFF_LOOPBACK)
1397 ia->ia_flags |= IFA_RTSELF;
1398 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1399 if (error)
1400 return (error);
1401 ia->ia_flags |= IFA_ROUTE;
1402 }
1403
1404 /*
1405 * add a loopback route to self if not exists
1406 */
1407 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1408 error = ifa_add_loopback_route((struct ifaddr *)ia,
1409 (struct sockaddr *)&ia->ia_addr);
1410 if (error == 0)
1411 ia->ia_flags |= IFA_RTSELF;
1412 }
1413
1414 return (error);
1415 }
1416
1417 /*
1418 * Find an IPv6 interface link-local address specific to an interface.
1419 * ifaddr is returned referenced.
1420 */
1421 struct in6_ifaddr *
1422 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1423 {
1424 struct ifaddr *ifa;
1425
1426 IF_ADDR_RLOCK(ifp);
1427 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1428 if (ifa->ifa_addr->sa_family != AF_INET6)
1429 continue;
1430 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1431 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1432 ignoreflags) != 0)
1433 continue;
1434 ifa_ref(ifa);
1435 break;
1436 }
1437 }
1438 IF_ADDR_RUNLOCK(ifp);
1439
1440 return ((struct in6_ifaddr *)ifa);
1441 }
1442
1443
1444 /*
1445 * find the internet address corresponding to a given address.
1446 * ifaddr is returned referenced.
1447 */
1448 struct in6_ifaddr *
1449 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1450 {
1451 struct rm_priotracker in6_ifa_tracker;
1452 struct in6_ifaddr *ia;
1453
1454 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1455 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1456 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1457 if (zoneid != 0 &&
1458 zoneid != ia->ia_addr.sin6_scope_id)
1459 continue;
1460 ifa_ref(&ia->ia_ifa);
1461 break;
1462 }
1463 }
1464 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1465 return (ia);
1466 }
1467
1468 /*
1469 * find the internet address corresponding to a given interface and address.
1470 * ifaddr is returned referenced.
1471 */
1472 struct in6_ifaddr *
1473 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1474 {
1475 struct ifaddr *ifa;
1476
1477 IF_ADDR_RLOCK(ifp);
1478 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1479 if (ifa->ifa_addr->sa_family != AF_INET6)
1480 continue;
1481 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1482 ifa_ref(ifa);
1483 break;
1484 }
1485 }
1486 IF_ADDR_RUNLOCK(ifp);
1487
1488 return ((struct in6_ifaddr *)ifa);
1489 }
1490
1491 /*
1492 * Find a link-local scoped address on ifp and return it if any.
1493 */
1494 struct in6_ifaddr *
1495 in6ifa_llaonifp(struct ifnet *ifp)
1496 {
1497 struct sockaddr_in6 *sin6;
1498 struct ifaddr *ifa;
1499
1500 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1501 return (NULL);
1502 IF_ADDR_RLOCK(ifp);
1503 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1504 if (ifa->ifa_addr->sa_family != AF_INET6)
1505 continue;
1506 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1507 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1508 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1509 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1510 break;
1511 }
1512 IF_ADDR_RUNLOCK(ifp);
1513
1514 return ((struct in6_ifaddr *)ifa);
1515 }
1516
1517 /*
1518 * Convert IP6 address to printable (loggable) representation. Caller
1519 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1520 */
1521 static char digits[] = "0123456789abcdef";
1522 char *
1523 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1524 {
1525 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1526 char *cp;
1527 const u_int16_t *a = (const u_int16_t *)addr;
1528 const u_int8_t *d;
1529 int dcolon = 0, zero = 0;
1530
1531 cp = ip6buf;
1532
1533 for (i = 0; i < 8; i++) {
1534 if (*(a + i) == 0) {
1535 cnt++;
1536 if (cnt == 1)
1537 idx = i;
1538 }
1539 else if (maxcnt < cnt) {
1540 maxcnt = cnt;
1541 index = idx;
1542 cnt = 0;
1543 }
1544 }
1545 if (maxcnt < cnt) {
1546 maxcnt = cnt;
1547 index = idx;
1548 }
1549
1550 for (i = 0; i < 8; i++) {
1551 if (dcolon == 1) {
1552 if (*a == 0) {
1553 if (i == 7)
1554 *cp++ = ':';
1555 a++;
1556 continue;
1557 } else
1558 dcolon = 2;
1559 }
1560 if (*a == 0) {
1561 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1562 if (i == 0)
1563 *cp++ = ':';
1564 *cp++ = ':';
1565 dcolon = 1;
1566 } else {
1567 *cp++ = '';
1568 *cp++ = ':';
1569 }
1570 a++;
1571 continue;
1572 }
1573 d = (const u_char *)a;
1574 /* Try to eliminate leading zeros in printout like in :0001. */
1575 zero = 1;
1576 *cp = digits[*d >> 4];
1577 if (*cp != '') {
1578 zero = 0;
1579 cp++;
1580 }
1581 *cp = digits[*d++ & 0xf];
1582 if (zero == 0 || (*cp != '')) {
1583 zero = 0;
1584 cp++;
1585 }
1586 *cp = digits[*d >> 4];
1587 if (zero == 0 || (*cp != '')) {
1588 zero = 0;
1589 cp++;
1590 }
1591 *cp++ = digits[*d & 0xf];
1592 *cp++ = ':';
1593 a++;
1594 }
1595 *--cp = '\0';
1596 return (ip6buf);
1597 }
1598
1599 int
1600 in6_localaddr(struct in6_addr *in6)
1601 {
1602 struct rm_priotracker in6_ifa_tracker;
1603 struct in6_ifaddr *ia;
1604
1605 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1606 return 1;
1607
1608 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1609 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1610 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1611 &ia->ia_prefixmask.sin6_addr)) {
1612 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1613 return 1;
1614 }
1615 }
1616 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1617
1618 return (0);
1619 }
1620
1621 /*
1622 * Return 1 if an internet address is for the local host and configured
1623 * on one of its interfaces.
1624 */
1625 int
1626 in6_localip(struct in6_addr *in6)
1627 {
1628 struct rm_priotracker in6_ifa_tracker;
1629 struct in6_ifaddr *ia;
1630
1631 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1632 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1633 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1634 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1635 return (1);
1636 }
1637 }
1638 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1639 return (0);
1640 }
1641
1642 /*
1643 * Return 1 if an internet address is configured on an interface.
1644 */
1645 int
1646 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1647 {
1648 struct in6_addr in6;
1649 struct ifaddr *ifa;
1650 struct in6_ifaddr *ia6;
1651
1652 in6 = *addr;
1653 if (in6_clearscope(&in6))
1654 return (0);
1655 in6_setscope(&in6, ifp, NULL);
1656
1657 IF_ADDR_RLOCK(ifp);
1658 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1659 if (ifa->ifa_addr->sa_family != AF_INET6)
1660 continue;
1661 ia6 = (struct in6_ifaddr *)ifa;
1662 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1663 IF_ADDR_RUNLOCK(ifp);
1664 return (1);
1665 }
1666 }
1667 IF_ADDR_RUNLOCK(ifp);
1668
1669 return (0);
1670 }
1671
1672 int
1673 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1674 {
1675 struct rm_priotracker in6_ifa_tracker;
1676 struct in6_ifaddr *ia;
1677
1678 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1679 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1680 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1681 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1682 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1683 return (1); /* true */
1684 }
1685 break;
1686 }
1687 }
1688 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1689
1690 return (0); /* false */
1691 }
1692
1693 /*
1694 * return length of part which dst and src are equal
1695 * hard coding...
1696 */
1697 int
1698 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1699 {
1700 int match = 0;
1701 u_char *s = (u_char *)src, *d = (u_char *)dst;
1702 u_char *lim = s + 16, r;
1703
1704 while (s < lim)
1705 if ((r = (*d++ ^ *s++)) != 0) {
1706 while (r < 128) {
1707 match++;
1708 r <<= 1;
1709 }
1710 break;
1711 } else
1712 match += 8;
1713 return match;
1714 }
1715
1716 /* XXX: to be scope conscious */
1717 int
1718 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1719 {
1720 int bytelen, bitlen;
1721
1722 /* sanity check */
1723 if (0 > len || len > 128) {
1724 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1725 len);
1726 return (0);
1727 }
1728
1729 bytelen = len / 8;
1730 bitlen = len % 8;
1731
1732 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1733 return (0);
1734 if (bitlen != 0 &&
1735 p1->s6_addr[bytelen] >> (8 - bitlen) !=
1736 p2->s6_addr[bytelen] >> (8 - bitlen))
1737 return (0);
1738
1739 return (1);
1740 }
1741
1742 void
1743 in6_prefixlen2mask(struct in6_addr *maskp, int len)
1744 {
1745 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1746 int bytelen, bitlen, i;
1747
1748 /* sanity check */
1749 if (0 > len || len > 128) {
1750 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1751 len);
1752 return;
1753 }
1754
1755 bzero(maskp, sizeof(*maskp));
1756 bytelen = len / 8;
1757 bitlen = len % 8;
1758 for (i = 0; i < bytelen; i++)
1759 maskp->s6_addr[i] = 0xff;
1760 if (bitlen)
1761 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1762 }
1763
1764 /*
1765 * return the best address out of the same scope. if no address was
1766 * found, return the first valid address from designated IF.
1767 */
1768 struct in6_ifaddr *
1769 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1770 {
1771 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
1772 struct ifaddr *ifa;
1773 struct in6_ifaddr *besta = NULL;
1774 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
1775
1776 dep[0] = dep[1] = NULL;
1777
1778 /*
1779 * We first look for addresses in the same scope.
1780 * If there is one, return it.
1781 * If two or more, return one which matches the dst longest.
1782 * If none, return one of global addresses assigned other ifs.
1783 */
1784 IF_ADDR_RLOCK(ifp);
1785 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1786 if (ifa->ifa_addr->sa_family != AF_INET6)
1787 continue;
1788 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1789 continue; /* XXX: is there any case to allow anycast? */
1790 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1791 continue; /* don't use this interface */
1792 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1793 continue;
1794 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1795 if (V_ip6_use_deprecated)
1796 dep[0] = (struct in6_ifaddr *)ifa;
1797 continue;
1798 }
1799
1800 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1801 /*
1802 * call in6_matchlen() as few as possible
1803 */
1804 if (besta) {
1805 if (blen == -1)
1806 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1807 tlen = in6_matchlen(IFA_IN6(ifa), dst);
1808 if (tlen > blen) {
1809 blen = tlen;
1810 besta = (struct in6_ifaddr *)ifa;
1811 }
1812 } else
1813 besta = (struct in6_ifaddr *)ifa;
1814 }
1815 }
1816 if (besta) {
1817 ifa_ref(&besta->ia_ifa);
1818 IF_ADDR_RUNLOCK(ifp);
1819 return (besta);
1820 }
1821
1822 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1823 if (ifa->ifa_addr->sa_family != AF_INET6)
1824 continue;
1825 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1826 continue; /* XXX: is there any case to allow anycast? */
1827 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1828 continue; /* don't use this interface */
1829 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1830 continue;
1831 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1832 if (V_ip6_use_deprecated)
1833 dep[1] = (struct in6_ifaddr *)ifa;
1834 continue;
1835 }
1836
1837 if (ifa != NULL)
1838 ifa_ref(ifa);
1839 IF_ADDR_RUNLOCK(ifp);
1840 return (struct in6_ifaddr *)ifa;
1841 }
1842
1843 /* use the last-resort values, that are, deprecated addresses */
1844 if (dep[0]) {
1845 ifa_ref((struct ifaddr *)dep[0]);
1846 IF_ADDR_RUNLOCK(ifp);
1847 return dep[0];
1848 }
1849 if (dep[1]) {
1850 ifa_ref((struct ifaddr *)dep[1]);
1851 IF_ADDR_RUNLOCK(ifp);
1852 return dep[1];
1853 }
1854
1855 IF_ADDR_RUNLOCK(ifp);
1856 return NULL;
1857 }
1858
1859 /*
1860 * perform DAD when interface becomes IFF_UP.
1861 */
1862 void
1863 in6_if_up(struct ifnet *ifp)
1864 {
1865 struct ifaddr *ifa;
1866 struct in6_ifaddr *ia;
1867
1868 IF_ADDR_RLOCK(ifp);
1869 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1870 if (ifa->ifa_addr->sa_family != AF_INET6)
1871 continue;
1872 ia = (struct in6_ifaddr *)ifa;
1873 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1874 /*
1875 * The TENTATIVE flag was likely set by hand
1876 * beforehand, implicitly indicating the need for DAD.
1877 * We may be able to skip the random delay in this
1878 * case, but we impose delays just in case.
1879 */
1880 nd6_dad_start(ifa,
1881 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1882 }
1883 }
1884 IF_ADDR_RUNLOCK(ifp);
1885
1886 /*
1887 * special cases, like 6to4, are handled in in6_ifattach
1888 */
1889 in6_ifattach(ifp, NULL);
1890 }
1891
1892 int
1893 in6if_do_dad(struct ifnet *ifp)
1894 {
1895 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1896 return (0);
1897
1898 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1899 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1900 return (0);
1901
1902 /*
1903 * Our DAD routine requires the interface up and running.
1904 * However, some interfaces can be up before the RUNNING
1905 * status. Additionally, users may try to assign addresses
1906 * before the interface becomes up (or running).
1907 * This function returns EAGAIN in that case.
1908 * The caller should mark "tentative" on the address instead of
1909 * performing DAD immediately.
1910 */
1911 if (!((ifp->if_flags & IFF_UP) &&
1912 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1913 return (EAGAIN);
1914
1915 return (1);
1916 }
1917
1918 /*
1919 * Calculate max IPv6 MTU through all the interfaces and store it
1920 * to in6_maxmtu.
1921 */
1922 void
1923 in6_setmaxmtu(void)
1924 {
1925 unsigned long maxmtu = 0;
1926 struct ifnet *ifp;
1927
1928 IFNET_RLOCK_NOSLEEP();
1929 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1930 /* this function can be called during ifnet initialization */
1931 if (!ifp->if_afdata[AF_INET6])
1932 continue;
1933 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1934 IN6_LINKMTU(ifp) > maxmtu)
1935 maxmtu = IN6_LINKMTU(ifp);
1936 }
1937 IFNET_RUNLOCK_NOSLEEP();
1938 if (maxmtu) /* update only when maxmtu is positive */
1939 V_in6_maxmtu = maxmtu;
1940 }
1941
1942 /*
1943 * Provide the length of interface identifiers to be used for the link attached
1944 * to the given interface. The length should be defined in "IPv6 over
1945 * xxx-link" document. Note that address architecture might also define
1946 * the length for a particular set of address prefixes, regardless of the
1947 * link type. As clarified in rfc2462bis, those two definitions should be
1948 * consistent, and those really are as of August 2004.
1949 */
1950 int
1951 in6_if2idlen(struct ifnet *ifp)
1952 {
1953 switch (ifp->if_type) {
1954 case IFT_ETHER: /* RFC2464 */
1955 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
1956 case IFT_L2VLAN: /* ditto */
1957 case IFT_IEEE80211: /* ditto */
1958 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */
1959 case IFT_INFINIBAND:
1960 return (64);
1961 case IFT_FDDI: /* RFC2467 */
1962 return (64);
1963 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */
1964 return (64);
1965 case IFT_PPP: /* RFC2472 */
1966 return (64);
1967 case IFT_ARCNET: /* RFC2497 */
1968 return (64);
1969 case IFT_FRELAY: /* RFC2590 */
1970 return (64);
1971 case IFT_IEEE1394: /* RFC3146 */
1972 return (64);
1973 case IFT_GIF:
1974 return (64); /* draft-ietf-v6ops-mech-v2-07 */
1975 case IFT_LOOP:
1976 return (64); /* XXX: is this really correct? */
1977 default:
1978 /*
1979 * Unknown link type:
1980 * It might be controversial to use the today's common constant
1981 * of 64 for these cases unconditionally. For full compliance,
1982 * we should return an error in this case. On the other hand,
1983 * if we simply miss the standard for the link type or a new
1984 * standard is defined for a new link type, the IFID length
1985 * is very likely to be the common constant. As a compromise,
1986 * we always use the constant, but make an explicit notice
1987 * indicating the "unknown" case.
1988 */
1989 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
1990 return (64);
1991 }
1992 }
1993
1994 #include <sys/sysctl.h>
1995
1996 struct in6_llentry {
1997 struct llentry base;
1998 };
1999
2000 #define IN6_LLTBL_DEFAULT_HSIZE 32
2001 #define IN6_LLTBL_HASH(k, h) \
2002 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2003
2004 /*
2005 * Do actual deallocation of @lle.
2006 */
2007 static void
2008 in6_lltable_destroy_lle_unlocked(struct llentry *lle)
2009 {
2010
2011 LLE_LOCK_DESTROY(lle);
2012 LLE_REQ_DESTROY(lle);
2013 free(lle, M_LLTABLE);
2014 }
2015
2016 /*
2017 * Called by LLE_FREE_LOCKED when number of references
2018 * drops to zero.
2019 */
2020 static void
2021 in6_lltable_destroy_lle(struct llentry *lle)
2022 {
2023
2024 LLE_WUNLOCK(lle);
2025 in6_lltable_destroy_lle_unlocked(lle);
2026 }
2027
2028 static struct llentry *
2029 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2030 {
2031 struct in6_llentry *lle;
2032
2033 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2034 if (lle == NULL) /* NB: caller generates msg */
2035 return NULL;
2036
2037 lle->base.r_l3addr.addr6 = *addr6;
2038 lle->base.lle_refcnt = 1;
2039 lle->base.lle_free = in6_lltable_destroy_lle;
2040 LLE_LOCK_INIT(&lle->base);
2041 LLE_REQ_INIT(&lle->base);
2042 callout_init(&lle->base.lle_timer, 1);
2043
2044 return (&lle->base);
2045 }
2046
2047 static int
2048 in6_lltable_match_prefix(const struct sockaddr *saddr,
2049 const struct sockaddr *smask, u_int flags, struct llentry *lle)
2050 {
2051 const struct in6_addr *addr, *mask, *lle_addr;
2052
2053 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2054 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2055 lle_addr = &lle->r_l3addr.addr6;
2056
2057 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2058 return (0);
2059
2060 if (lle->la_flags & LLE_IFADDR) {
2061
2062 /*
2063 * Delete LLE_IFADDR records IFF address & flag matches.
2064 * Note that addr is the interface address within prefix
2065 * being matched.
2066 */
2067 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2068 (flags & LLE_STATIC) != 0)
2069 return (1);
2070 return (0);
2071 }
2072
2073 /* flags & LLE_STATIC means deleting both dynamic and static entries */
2074 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2075 return (1);
2076
2077 return (0);
2078 }
2079
2080 static void
2081 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2082 {
2083 struct ifnet *ifp;
2084
2085 LLE_WLOCK_ASSERT(lle);
2086 KASSERT(llt != NULL, ("lltable is NULL"));
2087
2088 /* Unlink entry from table */
2089 if ((lle->la_flags & LLE_LINKED) != 0) {
2090
2091 ifp = llt->llt_ifp;
2092 IF_AFDATA_WLOCK_ASSERT(ifp);
2093 lltable_unlink_entry(llt, lle);
2094 }
2095
2096 if (callout_stop(&lle->lle_timer) > 0)
2097 LLE_REMREF(lle);
2098
2099 llentry_free(lle);
2100 }
2101
2102 static int
2103 in6_lltable_rtcheck(struct ifnet *ifp,
2104 u_int flags,
2105 const struct sockaddr *l3addr)
2106 {
2107 const struct sockaddr_in6 *sin6;
2108 struct nhop6_basic nh6;
2109 struct in6_addr dst;
2110 uint32_t scopeid;
2111 int error;
2112 char ip6buf[INET6_ADDRSTRLEN];
2113
2114 KASSERT(l3addr->sa_family == AF_INET6,
2115 ("sin_family %d", l3addr->sa_family));
2116
2117 /* Our local addresses are always only installed on the default FIB. */
2118
2119 sin6 = (const struct sockaddr_in6 *)l3addr;
2120 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2121 error = fib6_lookup_nh_basic(RT_DEFAULT_FIB, &dst, scopeid, 0, 0, &nh6);
2122 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
2123 struct ifaddr *ifa;
2124 /*
2125 * Create an ND6 cache for an IPv6 neighbor
2126 * that is not covered by our own prefix.
2127 */
2128 ifa = ifaof_ifpforaddr(l3addr, ifp);
2129 if (ifa != NULL) {
2130 ifa_free(ifa);
2131 return 0;
2132 }
2133 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2134 ip6_sprintf(ip6buf, &sin6->sin6_addr));
2135 return EINVAL;
2136 }
2137 return 0;
2138 }
2139
2140 static inline uint32_t
2141 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2142 {
2143
2144 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2145 }
2146
2147 static uint32_t
2148 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2149 {
2150
2151 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2152 }
2153
2154 static void
2155 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2156 {
2157 struct sockaddr_in6 *sin6;
2158
2159 sin6 = (struct sockaddr_in6 *)sa;
2160 bzero(sin6, sizeof(*sin6));
2161 sin6->sin6_family = AF_INET6;
2162 sin6->sin6_len = sizeof(*sin6);
2163 sin6->sin6_addr = lle->r_l3addr.addr6;
2164 }
2165
2166 static inline struct llentry *
2167 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2168 {
2169 struct llentry *lle;
2170 struct llentries *lleh;
2171 u_int hashidx;
2172
2173 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2174 lleh = &llt->lle_head[hashidx];
2175 LIST_FOREACH(lle, lleh, lle_next) {
2176 if (lle->la_flags & LLE_DELETED)
2177 continue;
2178 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2179 break;
2180 }
2181
2182 return (lle);
2183 }
2184
2185 static void
2186 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2187 {
2188
2189 lle->la_flags |= LLE_DELETED;
2190 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2191 #ifdef DIAGNOSTIC
2192 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2193 #endif
2194 llentry_free(lle);
2195 }
2196
2197 static struct llentry *
2198 in6_lltable_alloc(struct lltable *llt, u_int flags,
2199 const struct sockaddr *l3addr)
2200 {
2201 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2202 struct ifnet *ifp = llt->llt_ifp;
2203 struct llentry *lle;
2204 char linkhdr[LLE_MAX_LINKHDR];
2205 size_t linkhdrsize;
2206 int lladdr_off;
2207
2208 KASSERT(l3addr->sa_family == AF_INET6,
2209 ("sin_family %d", l3addr->sa_family));
2210
2211 /*
2212 * A route that covers the given address must have
2213 * been installed 1st because we are doing a resolution,
2214 * verify this.
2215 */
2216 if (!(flags & LLE_IFADDR) &&
2217 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2218 return (NULL);
2219
2220 lle = in6_lltable_new(&sin6->sin6_addr, flags);
2221 if (lle == NULL) {
2222 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2223 return (NULL);
2224 }
2225 lle->la_flags = flags;
2226 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2227 linkhdrsize = LLE_MAX_LINKHDR;
2228 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
2229 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
2230 in6_lltable_destroy_lle_unlocked(lle);
2231 return (NULL);
2232 }
2233 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
2234 lladdr_off);
2235 lle->la_flags |= LLE_STATIC;
2236 }
2237
2238 if ((lle->la_flags & LLE_STATIC) != 0)
2239 lle->ln_state = ND6_LLINFO_REACHABLE;
2240
2241 return (lle);
2242 }
2243
2244 static struct llentry *
2245 in6_lltable_lookup(struct lltable *llt, u_int flags,
2246 const struct sockaddr *l3addr)
2247 {
2248 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2249 struct llentry *lle;
2250
2251 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2252 KASSERT(l3addr->sa_family == AF_INET6,
2253 ("sin_family %d", l3addr->sa_family));
2254
2255 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2256
2257 if (lle == NULL)
2258 return (NULL);
2259
2260 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
2261 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
2262 flags));
2263
2264 if (flags & LLE_UNLOCKED)
2265 return (lle);
2266
2267 if (flags & LLE_EXCLUSIVE)
2268 LLE_WLOCK(lle);
2269 else
2270 LLE_RLOCK(lle);
2271 return (lle);
2272 }
2273
2274 static int
2275 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2276 struct sysctl_req *wr)
2277 {
2278 struct ifnet *ifp = llt->llt_ifp;
2279 /* XXX stack use */
2280 struct {
2281 struct rt_msghdr rtm;
2282 struct sockaddr_in6 sin6;
2283 /*
2284 * ndp.c assumes that sdl is word aligned
2285 */
2286 #ifdef __LP64__
2287 uint32_t pad;
2288 #endif
2289 struct sockaddr_dl sdl;
2290 } ndpc;
2291 struct sockaddr_dl *sdl;
2292 int error;
2293
2294 bzero(&ndpc, sizeof(ndpc));
2295 /* skip deleted entries */
2296 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2297 return (0);
2298 /* Skip if jailed and not a valid IP of the prison. */
2299 lltable_fill_sa_entry(lle,
2300 (struct sockaddr *)&ndpc.sin6);
2301 if (prison_if(wr->td->td_ucred,
2302 (struct sockaddr *)&ndpc.sin6) != 0)
2303 return (0);
2304 /*
2305 * produce a msg made of:
2306 * struct rt_msghdr;
2307 * struct sockaddr_in6 (IPv6)
2308 * struct sockaddr_dl;
2309 */
2310 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2311 ndpc.rtm.rtm_version = RTM_VERSION;
2312 ndpc.rtm.rtm_type = RTM_GET;
2313 ndpc.rtm.rtm_flags = RTF_UP;
2314 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2315 if (V_deembed_scopeid)
2316 sa6_recoverscope(&ndpc.sin6);
2317
2318 /* publish */
2319 if (lle->la_flags & LLE_PUB)
2320 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2321
2322 sdl = &ndpc.sdl;
2323 sdl->sdl_family = AF_LINK;
2324 sdl->sdl_len = sizeof(*sdl);
2325 sdl->sdl_index = ifp->if_index;
2326 sdl->sdl_type = ifp->if_type;
2327 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
2328 sdl->sdl_alen = ifp->if_addrlen;
2329 bcopy(lle->ll_addr, LLADDR(sdl),
2330 ifp->if_addrlen);
2331 } else {
2332 sdl->sdl_alen = 0;
2333 bzero(LLADDR(sdl), ifp->if_addrlen);
2334 }
2335 if (lle->la_expire != 0)
2336 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2337 lle->lle_remtime / hz +
2338 time_second - time_uptime;
2339 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2340 if (lle->la_flags & LLE_STATIC)
2341 ndpc.rtm.rtm_flags |= RTF_STATIC;
2342 if (lle->la_flags & LLE_IFADDR)
2343 ndpc.rtm.rtm_flags |= RTF_PINNED;
2344 if (lle->ln_router != 0)
2345 ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2346 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2347 /* Store state in rmx_weight value */
2348 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2349 ndpc.rtm.rtm_index = ifp->if_index;
2350 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2351
2352 return (error);
2353 }
2354
2355 static struct lltable *
2356 in6_lltattach(struct ifnet *ifp)
2357 {
2358 struct lltable *llt;
2359
2360 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2361 llt->llt_af = AF_INET6;
2362 llt->llt_ifp = ifp;
2363
2364 llt->llt_lookup = in6_lltable_lookup;
2365 llt->llt_alloc_entry = in6_lltable_alloc;
2366 llt->llt_delete_entry = in6_lltable_delete_entry;
2367 llt->llt_dump_entry = in6_lltable_dump_entry;
2368 llt->llt_hash = in6_lltable_hash;
2369 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2370 llt->llt_free_entry = in6_lltable_free_entry;
2371 llt->llt_match_prefix = in6_lltable_match_prefix;
2372 lltable_link(llt);
2373
2374 return (llt);
2375 }
2376
2377 void *
2378 in6_domifattach(struct ifnet *ifp)
2379 {
2380 struct in6_ifextra *ext;
2381
2382 /* There are not IPv6-capable interfaces. */
2383 switch (ifp->if_type) {
2384 case IFT_PFLOG:
2385 case IFT_PFSYNC:
2386 case IFT_USB:
2387 return (NULL);
2388 }
2389 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2390 bzero(ext, sizeof(*ext));
2391
2392 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2393 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2394 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2395 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2396
2397 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2398 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2399 M_WAITOK);
2400 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2401 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2402
2403 ext->nd_ifinfo = nd6_ifattach(ifp);
2404 ext->scope6_id = scope6_ifattach(ifp);
2405 ext->lltable = in6_lltattach(ifp);
2406
2407 ext->mld_ifinfo = mld_domifattach(ifp);
2408
2409 return ext;
2410 }
2411
2412 int
2413 in6_domifmtu(struct ifnet *ifp)
2414 {
2415 if (ifp->if_afdata[AF_INET6] == NULL)
2416 return ifp->if_mtu;
2417
2418 return (IN6_LINKMTU(ifp));
2419 }
2420
2421 void
2422 in6_domifdetach(struct ifnet *ifp, void *aux)
2423 {
2424 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2425
2426 mld_domifdetach(ifp);
2427 scope6_ifdetach(ext->scope6_id);
2428 nd6_ifdetach(ifp, ext->nd_ifinfo);
2429 lltable_free(ext->lltable);
2430 COUNTER_ARRAY_FREE(ext->in6_ifstat,
2431 sizeof(struct in6_ifstat) / sizeof(uint64_t));
2432 free(ext->in6_ifstat, M_IFADDR);
2433 COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2434 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2435 free(ext->icmp6_ifstat, M_IFADDR);
2436 free(ext, M_IFADDR);
2437 }
2438
2439 /*
2440 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2441 * v4 mapped addr or v4 compat addr
2442 */
2443 void
2444 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2445 {
2446
2447 bzero(sin, sizeof(*sin));
2448 sin->sin_len = sizeof(struct sockaddr_in);
2449 sin->sin_family = AF_INET;
2450 sin->sin_port = sin6->sin6_port;
2451 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2452 }
2453
2454 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2455 void
2456 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2457 {
2458 bzero(sin6, sizeof(*sin6));
2459 sin6->sin6_len = sizeof(struct sockaddr_in6);
2460 sin6->sin6_family = AF_INET6;
2461 sin6->sin6_port = sin->sin_port;
2462 sin6->sin6_addr.s6_addr32[0] = 0;
2463 sin6->sin6_addr.s6_addr32[1] = 0;
2464 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2465 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2466 }
2467
2468 /* Convert sockaddr_in6 into sockaddr_in. */
2469 void
2470 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2471 {
2472 struct sockaddr_in *sin_p;
2473 struct sockaddr_in6 sin6;
2474
2475 /*
2476 * Save original sockaddr_in6 addr and convert it
2477 * to sockaddr_in.
2478 */
2479 sin6 = *(struct sockaddr_in6 *)nam;
2480 sin_p = (struct sockaddr_in *)nam;
2481 in6_sin6_2_sin(sin_p, &sin6);
2482 }
2483
2484 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2485 void
2486 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2487 {
2488 struct sockaddr_in *sin_p;
2489 struct sockaddr_in6 *sin6_p;
2490
2491 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2492 sin_p = (struct sockaddr_in *)*nam;
2493 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2494 free(*nam, M_SONAME);
2495 *nam = (struct sockaddr *)sin6_p;
2496 }
Cache object: 3484e3de05cd2ef0bf2575851ca57465
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