xref: /freebsd/sys/netinet6/in6.c (revision 5d06879adb95ac922703072a28fc11048d809a4b)
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("$FreeBSD$");
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_pcb.h>
111 
112 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
113 #define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
114 
115 /*
116  * Definitions of some costant IP6 addresses.
117  */
118 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
119 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
120 const struct in6_addr in6addr_nodelocal_allnodes =
121 	IN6ADDR_NODELOCAL_ALLNODES_INIT;
122 const struct in6_addr in6addr_linklocal_allnodes =
123 	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
124 const struct in6_addr in6addr_linklocal_allrouters =
125 	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
126 const struct in6_addr in6addr_linklocal_allv2routers =
127 	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
128 
129 const struct in6_addr in6mask0 = IN6MASK0;
130 const struct in6_addr in6mask32 = IN6MASK32;
131 const struct in6_addr in6mask64 = IN6MASK64;
132 const struct in6_addr in6mask96 = IN6MASK96;
133 const struct in6_addr in6mask128 = IN6MASK128;
134 
135 const struct sockaddr_in6 sa6_any =
136 	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
137 
138 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
139 	struct in6_aliasreq *, int);
140 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
141 
142 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
143     struct in6_ifaddr *, int);
144 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
145     struct in6_aliasreq *, int flags);
146 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
147     struct in6_ifaddr *, int, int);
148 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
149     struct in6_ifaddr *, int);
150 
151 #define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
152 #define ia62ifa(ia6)	(&((ia6)->ia_ifa))
153 
154 
155 void
156 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
157 {
158 	struct sockaddr_dl gateway;
159 	struct sockaddr_in6 mask, addr;
160 	struct rtentry rt;
161 
162 	/*
163 	 * initialize for rtmsg generation
164 	 */
165 	bzero(&gateway, sizeof(gateway));
166 	gateway.sdl_len = sizeof(gateway);
167 	gateway.sdl_family = AF_LINK;
168 
169 	bzero(&rt, sizeof(rt));
170 	rt.rt_gateway = (struct sockaddr *)&gateway;
171 	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
172 	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
173 	rt_mask(&rt) = (struct sockaddr *)&mask;
174 	rt_key(&rt) = (struct sockaddr *)&addr;
175 	rt.rt_flags = RTF_HOST | RTF_STATIC;
176 	if (cmd == RTM_ADD)
177 		rt.rt_flags |= RTF_UP;
178 	/* Announce arrival of local address to all FIBs. */
179 	rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
180 }
181 
182 int
183 in6_mask2len(struct in6_addr *mask, u_char *lim0)
184 {
185 	int x = 0, y;
186 	u_char *lim = lim0, *p;
187 
188 	/* ignore the scope_id part */
189 	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
190 		lim = (u_char *)mask + sizeof(*mask);
191 	for (p = (u_char *)mask; p < lim; x++, p++) {
192 		if (*p != 0xff)
193 			break;
194 	}
195 	y = 0;
196 	if (p < lim) {
197 		for (y = 0; y < 8; y++) {
198 			if ((*p & (0x80 >> y)) == 0)
199 				break;
200 		}
201 	}
202 
203 	/*
204 	 * when the limit pointer is given, do a stricter check on the
205 	 * remaining bits.
206 	 */
207 	if (p < lim) {
208 		if (y != 0 && (*p & (0x00ff >> y)) != 0)
209 			return (-1);
210 		for (p = p + 1; p < lim; p++)
211 			if (*p != 0)
212 				return (-1);
213 	}
214 
215 	return x * 8 + y;
216 }
217 
218 #ifdef COMPAT_FREEBSD32
219 struct in6_ndifreq32 {
220 	char ifname[IFNAMSIZ];
221 	uint32_t ifindex;
222 };
223 #define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
224 #endif
225 
226 int
227 in6_control(struct socket *so, u_long cmd, caddr_t data,
228     struct ifnet *ifp, struct thread *td)
229 {
230 	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
231 	struct	in6_ifaddr *ia = NULL;
232 	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
233 	struct sockaddr_in6 *sa6;
234 	int carp_attached = 0;
235 	int error;
236 	u_long ocmd = cmd;
237 
238 	/*
239 	 * Compat to make pre-10.x ifconfig(8) operable.
240 	 */
241 	if (cmd == OSIOCAIFADDR_IN6)
242 		cmd = SIOCAIFADDR_IN6;
243 
244 	switch (cmd) {
245 	case SIOCGETSGCNT_IN6:
246 	case SIOCGETMIFCNT_IN6:
247 		/*
248 		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
249 		 * We cannot see how that would be needed, so do not adjust the
250 		 * KPI blindly; more likely should clean up the IPv4 variant.
251 		 */
252 		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
253 	}
254 
255 	switch (cmd) {
256 	case SIOCAADDRCTL_POLICY:
257 	case SIOCDADDRCTL_POLICY:
258 		if (td != NULL) {
259 			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
260 			if (error)
261 				return (error);
262 		}
263 		return (in6_src_ioctl(cmd, data));
264 	}
265 
266 	if (ifp == NULL)
267 		return (EOPNOTSUPP);
268 
269 	switch (cmd) {
270 	case SIOCSNDFLUSH_IN6:
271 	case SIOCSPFXFLUSH_IN6:
272 	case SIOCSRTRFLUSH_IN6:
273 	case SIOCSDEFIFACE_IN6:
274 	case SIOCSIFINFO_FLAGS:
275 	case SIOCSIFINFO_IN6:
276 		if (td != NULL) {
277 			error = priv_check(td, PRIV_NETINET_ND6);
278 			if (error)
279 				return (error);
280 		}
281 		/* FALLTHROUGH */
282 	case OSIOCGIFINFO_IN6:
283 	case SIOCGIFINFO_IN6:
284 	case SIOCGNBRINFO_IN6:
285 	case SIOCGDEFIFACE_IN6:
286 		return (nd6_ioctl(cmd, data, ifp));
287 
288 #ifdef COMPAT_FREEBSD32
289 	case SIOCGDEFIFACE32_IN6:
290 		{
291 			struct in6_ndifreq ndif;
292 			struct in6_ndifreq32 *ndif32;
293 
294 			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
295 			    ifp);
296 			if (error)
297 				return (error);
298 			ndif32 = (struct in6_ndifreq32 *)data;
299 			ndif32->ifindex = ndif.ifindex;
300 			return (0);
301 		}
302 #endif
303 	}
304 
305 	switch (cmd) {
306 	case SIOCSIFPREFIX_IN6:
307 	case SIOCDIFPREFIX_IN6:
308 	case SIOCAIFPREFIX_IN6:
309 	case SIOCCIFPREFIX_IN6:
310 	case SIOCSGIFPREFIX_IN6:
311 	case SIOCGIFPREFIX_IN6:
312 		log(LOG_NOTICE,
313 		    "prefix ioctls are now invalidated. "
314 		    "please use ifconfig.\n");
315 		return (EOPNOTSUPP);
316 	}
317 
318 	switch (cmd) {
319 	case SIOCSSCOPE6:
320 		if (td != NULL) {
321 			error = priv_check(td, PRIV_NETINET_SCOPE6);
322 			if (error)
323 				return (error);
324 		}
325 		/* FALLTHROUGH */
326 	case SIOCGSCOPE6:
327 	case SIOCGSCOPE6DEF:
328 		return (scope6_ioctl(cmd, data, ifp));
329 	}
330 
331 	/*
332 	 * Find address for this interface, if it exists.
333 	 *
334 	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
335 	 * only, and used the first interface address as the target of other
336 	 * operations (without checking ifra_addr).  This was because netinet
337 	 * code/API assumed at most 1 interface address per interface.
338 	 * Since IPv6 allows a node to assign multiple addresses
339 	 * on a single interface, we almost always look and check the
340 	 * presence of ifra_addr, and reject invalid ones here.
341 	 * It also decreases duplicated code among SIOC*_IN6 operations.
342 	 */
343 	switch (cmd) {
344 	case SIOCAIFADDR_IN6:
345 	case SIOCSIFPHYADDR_IN6:
346 		sa6 = &ifra->ifra_addr;
347 		break;
348 	case SIOCSIFADDR_IN6:
349 	case SIOCGIFADDR_IN6:
350 	case SIOCSIFDSTADDR_IN6:
351 	case SIOCSIFNETMASK_IN6:
352 	case SIOCGIFDSTADDR_IN6:
353 	case SIOCGIFNETMASK_IN6:
354 	case SIOCDIFADDR_IN6:
355 	case SIOCGIFPSRCADDR_IN6:
356 	case SIOCGIFPDSTADDR_IN6:
357 	case SIOCGIFAFLAG_IN6:
358 	case SIOCSNDFLUSH_IN6:
359 	case SIOCSPFXFLUSH_IN6:
360 	case SIOCSRTRFLUSH_IN6:
361 	case SIOCGIFALIFETIME_IN6:
362 	case SIOCSIFALIFETIME_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 	case SIOCSIFALIFETIME_IN6:
463 	    {
464 		struct in6_addrlifetime *lt;
465 
466 		if (td != NULL) {
467 			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
468 			if (error)
469 				goto out;
470 		}
471 		if (ia == NULL) {
472 			error = EADDRNOTAVAIL;
473 			goto out;
474 		}
475 		/* sanity for overflow - beware unsigned */
476 		lt = &ifr->ifr_ifru.ifru_lifetime;
477 		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
478 		    lt->ia6t_vltime + time_uptime < time_uptime) {
479 			error = EINVAL;
480 			goto out;
481 		}
482 		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
483 		    lt->ia6t_pltime + time_uptime < time_uptime) {
484 			error = EINVAL;
485 			goto out;
486 		}
487 		break;
488 	    }
489 	}
490 
491 	switch (cmd) {
492 	case SIOCGIFADDR_IN6:
493 		ifr->ifr_addr = ia->ia_addr;
494 		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
495 			goto out;
496 		break;
497 
498 	case SIOCGIFDSTADDR_IN6:
499 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
500 			error = EINVAL;
501 			goto out;
502 		}
503 		/*
504 		 * XXX: should we check if ifa_dstaddr is NULL and return
505 		 * an error?
506 		 */
507 		ifr->ifr_dstaddr = ia->ia_dstaddr;
508 		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
509 			goto out;
510 		break;
511 
512 	case SIOCGIFNETMASK_IN6:
513 		ifr->ifr_addr = ia->ia_prefixmask;
514 		break;
515 
516 	case SIOCGIFAFLAG_IN6:
517 		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
518 		break;
519 
520 	case SIOCGIFSTAT_IN6:
521 		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
522 		    ifp->if_afdata[AF_INET6])->in6_ifstat,
523 		    &ifr->ifr_ifru.ifru_stat,
524 		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
525 		break;
526 
527 	case SIOCGIFSTAT_ICMP6:
528 		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
529 		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
530 		    &ifr->ifr_ifru.ifru_icmp6stat,
531 		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
532 		break;
533 
534 	case SIOCGIFALIFETIME_IN6:
535 		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
536 		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
537 			time_t maxexpire;
538 			struct in6_addrlifetime *retlt =
539 			    &ifr->ifr_ifru.ifru_lifetime;
540 
541 			/*
542 			 * XXX: adjust expiration time assuming time_t is
543 			 * signed.
544 			 */
545 			maxexpire = (-1) &
546 			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
547 			if (ia->ia6_lifetime.ia6t_vltime <
548 			    maxexpire - ia->ia6_updatetime) {
549 				retlt->ia6t_expire = ia->ia6_updatetime +
550 				    ia->ia6_lifetime.ia6t_vltime;
551 			} else
552 				retlt->ia6t_expire = maxexpire;
553 		}
554 		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
555 			time_t maxexpire;
556 			struct in6_addrlifetime *retlt =
557 			    &ifr->ifr_ifru.ifru_lifetime;
558 
559 			/*
560 			 * XXX: adjust expiration time assuming time_t is
561 			 * signed.
562 			 */
563 			maxexpire = (-1) &
564 			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
565 			if (ia->ia6_lifetime.ia6t_pltime <
566 			    maxexpire - ia->ia6_updatetime) {
567 				retlt->ia6t_preferred = ia->ia6_updatetime +
568 				    ia->ia6_lifetime.ia6t_pltime;
569 			} else
570 				retlt->ia6t_preferred = maxexpire;
571 		}
572 		break;
573 
574 	case SIOCSIFALIFETIME_IN6:
575 		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
576 		/* for sanity */
577 		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
578 			ia->ia6_lifetime.ia6t_expire =
579 				time_uptime + ia->ia6_lifetime.ia6t_vltime;
580 		} else
581 			ia->ia6_lifetime.ia6t_expire = 0;
582 		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
583 			ia->ia6_lifetime.ia6t_preferred =
584 				time_uptime + ia->ia6_lifetime.ia6t_pltime;
585 		} else
586 			ia->ia6_lifetime.ia6t_preferred = 0;
587 		break;
588 
589 	case SIOCAIFADDR_IN6:
590 	{
591 		struct nd_prefixctl pr0;
592 		struct nd_prefix *pr;
593 
594 		/*
595 		 * first, make or update the interface address structure,
596 		 * and link it to the list.
597 		 */
598 		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
599 			goto out;
600 		if (ia != NULL)
601 			ifa_free(&ia->ia_ifa);
602 		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
603 		    == NULL) {
604 			/*
605 			 * this can happen when the user specify the 0 valid
606 			 * lifetime.
607 			 */
608 			break;
609 		}
610 
611 		if (cmd == ocmd && ifra->ifra_vhid > 0) {
612 			if (carp_attach_p != NULL)
613 				error = (*carp_attach_p)(&ia->ia_ifa,
614 				    ifra->ifra_vhid);
615 			else
616 				error = EPROTONOSUPPORT;
617 			if (error)
618 				goto out;
619 			else
620 				carp_attached = 1;
621 		}
622 
623 		/*
624 		 * then, make the prefix on-link on the interface.
625 		 * XXX: we'd rather create the prefix before the address, but
626 		 * we need at least one address to install the corresponding
627 		 * interface route, so we configure the address first.
628 		 */
629 
630 		/*
631 		 * convert mask to prefix length (prefixmask has already
632 		 * been validated in in6_update_ifa().
633 		 */
634 		bzero(&pr0, sizeof(pr0));
635 		pr0.ndpr_ifp = ifp;
636 		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
637 		    NULL);
638 		if (pr0.ndpr_plen == 128) {
639 			/* we don't need to install a host route. */
640 			goto aifaddr_out;
641 		}
642 		pr0.ndpr_prefix = ifra->ifra_addr;
643 		/* apply the mask for safety. */
644 		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
645 		    &ifra->ifra_prefixmask.sin6_addr);
646 
647 		/*
648 		 * XXX: since we don't have an API to set prefix (not address)
649 		 * lifetimes, we just use the same lifetimes as addresses.
650 		 * The (temporarily) installed lifetimes can be overridden by
651 		 * later advertised RAs (when accept_rtadv is non 0), which is
652 		 * an intended behavior.
653 		 */
654 		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
655 		pr0.ndpr_raf_auto =
656 		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
657 		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
658 		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
659 
660 		/* add the prefix if not yet. */
661 		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
662 			/*
663 			 * nd6_prelist_add will install the corresponding
664 			 * interface route.
665 			 */
666 			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
667 				if (carp_attached)
668 					(*carp_detach_p)(&ia->ia_ifa);
669 				goto out;
670 			}
671 			if (pr == NULL) {
672 				if (carp_attached)
673 					(*carp_detach_p)(&ia->ia_ifa);
674 				log(LOG_ERR, "nd6_prelist_add succeeded but "
675 				    "no prefix\n");
676 				error = EINVAL;
677 				goto out;
678 			}
679 		}
680 
681 		/* relate the address to the prefix */
682 		if (ia->ia6_ndpr == NULL) {
683 			ia->ia6_ndpr = pr;
684 			pr->ndpr_refcnt++;
685 
686 			/*
687 			 * If this is the first autoconf address from the
688 			 * prefix, create a temporary address as well
689 			 * (when required).
690 			 */
691 			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
692 			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
693 				int e;
694 				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
695 					log(LOG_NOTICE, "in6_control: failed "
696 					    "to create a temporary address, "
697 					    "errno=%d\n", e);
698 				}
699 			}
700 		}
701 
702 		/*
703 		 * this might affect the status of autoconfigured addresses,
704 		 * that is, this address might make other addresses detached.
705 		 */
706 		pfxlist_onlink_check();
707 aifaddr_out:
708 		if (error != 0 || ia == NULL)
709 			break;
710 		/*
711 		 * Try to clear the flag when a new IPv6 address is added
712 		 * onto an IFDISABLED interface and it succeeds.
713 		 */
714 		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
715 			struct in6_ndireq nd;
716 
717 			memset(&nd, 0, sizeof(nd));
718 			nd.ndi.flags = ND_IFINFO(ifp)->flags;
719 			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
720 			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
721 				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
722 				    "SIOCSIFINFO_FLAGS for -ifdisabled "
723 				    "failed.");
724 			/*
725 			 * Ignore failure of clearing the flag intentionally.
726 			 * The failure means address duplication was detected.
727 			 */
728 		}
729 		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
730 		break;
731 	}
732 
733 	case SIOCDIFADDR_IN6:
734 	{
735 		struct nd_prefix *pr;
736 
737 		/*
738 		 * If the address being deleted is the only one that owns
739 		 * the corresponding prefix, expire the prefix as well.
740 		 * XXX: theoretically, we don't have to worry about such
741 		 * relationship, since we separate the address management
742 		 * and the prefix management.  We do this, however, to provide
743 		 * as much backward compatibility as possible in terms of
744 		 * the ioctl operation.
745 		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
746 		 */
747 		pr = ia->ia6_ndpr;
748 		in6_purgeaddr(&ia->ia_ifa);
749 		if (pr && pr->ndpr_refcnt == 0)
750 			prelist_remove(pr);
751 		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
752 		break;
753 	}
754 
755 	default:
756 		if (ifp->if_ioctl == NULL) {
757 			error = EOPNOTSUPP;
758 			goto out;
759 		}
760 		error = (*ifp->if_ioctl)(ifp, cmd, data);
761 		goto out;
762 	}
763 
764 	error = 0;
765 out:
766 	if (ia != NULL)
767 		ifa_free(&ia->ia_ifa);
768 	return (error);
769 }
770 
771 
772 /*
773  * Join necessary multicast groups.  Factored out from in6_update_ifa().
774  * This entire work should only be done once, for the default FIB.
775  */
776 static int
777 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
778     struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
779 {
780 	char ip6buf[INET6_ADDRSTRLEN];
781 	struct in6_addr mltaddr;
782 	struct in6_multi_mship *imm;
783 	int delay, error;
784 
785 	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
786 
787 	/* Join solicited multicast addr for new host id. */
788 	bzero(&mltaddr, sizeof(struct in6_addr));
789 	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
790 	mltaddr.s6_addr32[2] = htonl(1);
791 	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
792 	mltaddr.s6_addr8[12] = 0xff;
793 	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
794 		/* XXX: should not happen */
795 		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
796 		goto cleanup;
797 	}
798 	delay = error = 0;
799 	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
800 		/*
801 		 * We need a random delay for DAD on the address being
802 		 * configured.  It also means delaying transmission of the
803 		 * corresponding MLD report to avoid report collision.
804 		 * [RFC 4861, Section 6.3.7]
805 		 */
806 		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
807 	}
808 	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
809 	if (imm == NULL) {
810 		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
811 		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
812 		    if_name(ifp), error));
813 		goto cleanup;
814 	}
815 	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816 	*in6m_sol = imm->i6mm_maddr;
817 
818 	/*
819 	 * Join link-local all-nodes address.
820 	 */
821 	mltaddr = in6addr_linklocal_allnodes;
822 	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
823 		goto cleanup; /* XXX: should not fail */
824 
825 	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
826 	if (imm == NULL) {
827 		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
828 		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
829 		    if_name(ifp), error));
830 		goto cleanup;
831 	}
832 	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
833 
834 	/*
835 	 * Join node information group address.
836 	 */
837 	delay = 0;
838 	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
839 		/*
840 		 * The spec does not say anything about delay for this group,
841 		 * but the same logic should apply.
842 		 */
843 		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
844 	}
845 	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
846 		/* XXX jinmei */
847 		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
848 		if (imm == NULL)
849 			nd6log((LOG_WARNING,
850 			    "%s: in6_joingroup failed for %s on %s "
851 			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
852 			    &mltaddr), if_name(ifp), error));
853 			/* XXX not very fatal, go on... */
854 		else
855 			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
856 	}
857 	if (V_icmp6_nodeinfo_oldmcprefix &&
858 	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
859 		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
860 		if (imm == NULL)
861 			nd6log((LOG_WARNING,
862 			    "%s: in6_joingroup failed for %s on %s "
863 			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
864 			    &mltaddr), if_name(ifp), error));
865 			/* XXX not very fatal, go on... */
866 		else
867 			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
868 	}
869 
870 	/*
871 	 * Join interface-local all-nodes address.
872 	 * (ff01::1%ifN, and ff01::%ifN/32)
873 	 */
874 	mltaddr = in6addr_nodelocal_allnodes;
875 	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
876 		goto cleanup; /* XXX: should not fail */
877 
878 	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
879 	if (imm == NULL) {
880 		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
881 		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
882 		    &mltaddr), if_name(ifp), error));
883 		goto cleanup;
884 	}
885 	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
886 
887 cleanup:
888 	return (error);
889 }
890 
891 /*
892  * Update parameters of an IPv6 interface address.
893  * If necessary, a new entry is created and linked into address chains.
894  * This function is separated from in6_control().
895  */
896 int
897 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
898     struct in6_ifaddr *ia, int flags)
899 {
900 	int error, hostIsNew = 0;
901 
902 	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
903 		return (error);
904 
905 	if (ia == NULL) {
906 		hostIsNew = 1;
907 		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
908 			return (ENOBUFS);
909 	}
910 
911 	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
912 	if (error != 0) {
913 		if (hostIsNew != 0) {
914 			in6_unlink_ifa(ia, ifp);
915 			ifa_free(&ia->ia_ifa);
916 		}
917 		return (error);
918 	}
919 
920 	if (hostIsNew)
921 		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
922 
923 	return (error);
924 }
925 
926 /*
927  * Fill in basic IPv6 address request info.
928  */
929 void
930 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
931     const struct in6_addr *mask)
932 {
933 
934 	memset(ifra, 0, sizeof(struct in6_aliasreq));
935 
936 	ifra->ifra_addr.sin6_family = AF_INET6;
937 	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
938 	if (addr != NULL)
939 		ifra->ifra_addr.sin6_addr = *addr;
940 
941 	ifra->ifra_prefixmask.sin6_family = AF_INET6;
942 	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
943 	if (mask != NULL)
944 		ifra->ifra_prefixmask.sin6_addr = *mask;
945 }
946 
947 static int
948 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
949     struct in6_ifaddr *ia, int flags)
950 {
951 	int plen = -1;
952 	struct sockaddr_in6 dst6;
953 	struct in6_addrlifetime *lt;
954 	char ip6buf[INET6_ADDRSTRLEN];
955 
956 	/* Validate parameters */
957 	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
958 		return (EINVAL);
959 
960 	/*
961 	 * The destination address for a p2p link must have a family
962 	 * of AF_UNSPEC or AF_INET6.
963 	 */
964 	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
965 	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
966 	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
967 		return (EAFNOSUPPORT);
968 
969 	/*
970 	 * Validate address
971 	 */
972 	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
973 	    ifra->ifra_addr.sin6_family != AF_INET6)
974 		return (EINVAL);
975 
976 	/*
977 	 * validate ifra_prefixmask.  don't check sin6_family, netmask
978 	 * does not carry fields other than sin6_len.
979 	 */
980 	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
981 		return (EINVAL);
982 	/*
983 	 * Because the IPv6 address architecture is classless, we require
984 	 * users to specify a (non 0) prefix length (mask) for a new address.
985 	 * We also require the prefix (when specified) mask is valid, and thus
986 	 * reject a non-consecutive mask.
987 	 */
988 	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
989 		return (EINVAL);
990 	if (ifra->ifra_prefixmask.sin6_len != 0) {
991 		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
992 		    (u_char *)&ifra->ifra_prefixmask +
993 		    ifra->ifra_prefixmask.sin6_len);
994 		if (plen <= 0)
995 			return (EINVAL);
996 	} else {
997 		/*
998 		 * In this case, ia must not be NULL.  We just use its prefix
999 		 * length.
1000 		 */
1001 		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1002 	}
1003 	/*
1004 	 * If the destination address on a p2p interface is specified,
1005 	 * and the address is a scoped one, validate/set the scope
1006 	 * zone identifier.
1007 	 */
1008 	dst6 = ifra->ifra_dstaddr;
1009 	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1010 	    (dst6.sin6_family == AF_INET6)) {
1011 		struct in6_addr in6_tmp;
1012 		u_int32_t zoneid;
1013 
1014 		in6_tmp = dst6.sin6_addr;
1015 		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1016 			return (EINVAL); /* XXX: should be impossible */
1017 
1018 		if (dst6.sin6_scope_id != 0) {
1019 			if (dst6.sin6_scope_id != zoneid)
1020 				return (EINVAL);
1021 		} else		/* user omit to specify the ID. */
1022 			dst6.sin6_scope_id = zoneid;
1023 
1024 		/* convert into the internal form */
1025 		if (sa6_embedscope(&dst6, 0))
1026 			return (EINVAL); /* XXX: should be impossible */
1027 	}
1028 	/* Modify original ifra_dstaddr to reflect changes */
1029 	ifra->ifra_dstaddr = dst6;
1030 
1031 	/*
1032 	 * The destination address can be specified only for a p2p or a
1033 	 * loopback interface.  If specified, the corresponding prefix length
1034 	 * must be 128.
1035 	 */
1036 	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1037 		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1038 			/* XXX: noisy message */
1039 			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1040 			    "be specified for a p2p or a loopback IF only\n"));
1041 			return (EINVAL);
1042 		}
1043 		if (plen != 128) {
1044 			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1045 			    "be 128 when dstaddr is specified\n"));
1046 			return (EINVAL);
1047 		}
1048 	}
1049 	/* lifetime consistency check */
1050 	lt = &ifra->ifra_lifetime;
1051 	if (lt->ia6t_pltime > lt->ia6t_vltime)
1052 		return (EINVAL);
1053 	if (lt->ia6t_vltime == 0) {
1054 		/*
1055 		 * the following log might be noisy, but this is a typical
1056 		 * configuration mistake or a tool's bug.
1057 		 */
1058 		nd6log((LOG_INFO,
1059 		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1060 		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1061 
1062 		if (ia == NULL)
1063 			return (0); /* there's nothing to do */
1064 	}
1065 
1066 	/* Check prefix mask */
1067 	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1068 		/*
1069 		 * We prohibit changing the prefix length of an existing
1070 		 * address, because
1071 		 * + such an operation should be rare in IPv6, and
1072 		 * + the operation would confuse prefix management.
1073 		 */
1074 		if (ia->ia_prefixmask.sin6_len != 0 &&
1075 		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1076 			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1077 			    "of an existing %s address should not be changed\n",
1078 			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1079 
1080 			return (EINVAL);
1081 		}
1082 	}
1083 
1084 	return (0);
1085 }
1086 
1087 
1088 /*
1089  * Allocate a new ifaddr and link it into chains.
1090  */
1091 static struct in6_ifaddr *
1092 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1093 {
1094 	struct in6_ifaddr *ia;
1095 
1096 	/*
1097 	 * When in6_alloc_ifa() is called in a process of a received
1098 	 * RA, it is called under an interrupt context.  So, we should
1099 	 * call malloc with M_NOWAIT.
1100 	 */
1101 	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1102 	if (ia == NULL)
1103 		return (NULL);
1104 	LIST_INIT(&ia->ia6_memberships);
1105 	/* Initialize the address and masks, and put time stamp */
1106 	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1107 	ia->ia_addr.sin6_family = AF_INET6;
1108 	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1109 	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1110 	ia->ia_addr = ifra->ifra_addr;
1111 	ia->ia6_createtime = time_uptime;
1112 	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1113 		/*
1114 		 * Some functions expect that ifa_dstaddr is not
1115 		 * NULL for p2p interfaces.
1116 		 */
1117 		ia->ia_ifa.ifa_dstaddr =
1118 		    (struct sockaddr *)&ia->ia_dstaddr;
1119 	} else {
1120 		ia->ia_ifa.ifa_dstaddr = NULL;
1121 	}
1122 
1123 	/* set prefix mask if any */
1124 	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1125 	if (ifra->ifra_prefixmask.sin6_len != 0) {
1126 		ia->ia_prefixmask.sin6_family = AF_INET6;
1127 		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1128 		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1129 	}
1130 
1131 	ia->ia_ifp = ifp;
1132 	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1133 	IF_ADDR_WLOCK(ifp);
1134 	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1135 	IF_ADDR_WUNLOCK(ifp);
1136 
1137 	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1138 	IN6_IFADDR_WLOCK();
1139 	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1140 	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1141 	IN6_IFADDR_WUNLOCK();
1142 
1143 	return (ia);
1144 }
1145 
1146 /*
1147  * Update/configure interface address parameters:
1148  *
1149  * 1) Update lifetime
1150  * 2) Update interface metric ad flags
1151  * 3) Notify other subsystems
1152  */
1153 static int
1154 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1155     struct in6_ifaddr *ia, int hostIsNew, int flags)
1156 {
1157 	int error;
1158 
1159 	/* update timestamp */
1160 	ia->ia6_updatetime = time_uptime;
1161 
1162 	/*
1163 	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1164 	 * to see if the address is deprecated or invalidated, but initialize
1165 	 * these members for applications.
1166 	 */
1167 	ia->ia6_lifetime = ifra->ifra_lifetime;
1168 	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1169 		ia->ia6_lifetime.ia6t_expire =
1170 		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1171 	} else
1172 		ia->ia6_lifetime.ia6t_expire = 0;
1173 	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1174 		ia->ia6_lifetime.ia6t_preferred =
1175 		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1176 	} else
1177 		ia->ia6_lifetime.ia6t_preferred = 0;
1178 
1179 	/*
1180 	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1181 	 * userland, make it deprecated.
1182 	 */
1183 	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1184 		ia->ia6_lifetime.ia6t_pltime = 0;
1185 		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1186 	}
1187 
1188 	/*
1189 	 * configure address flags.
1190 	 */
1191 	ia->ia6_flags = ifra->ifra_flags;
1192 
1193 	/*
1194 	 * Make the address tentative before joining multicast addresses,
1195 	 * so that corresponding MLD responses would not have a tentative
1196 	 * source address.
1197 	 */
1198 	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1199 
1200 	/*
1201 	 * DAD should be performed for an new address or addresses on
1202 	 * an interface with ND6_IFF_IFDISABLED.
1203 	 */
1204 	if (in6if_do_dad(ifp) &&
1205 	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1206 		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1207 
1208 	/* notify other subsystems */
1209 	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1210 
1211 	return (error);
1212 }
1213 
1214 /*
1215  * Do link-level ifa job:
1216  * 1) Add lle entry for added address
1217  * 2) Notifies routing socket users about new address
1218  * 3) join appropriate multicast group
1219  * 4) start DAD if enabled
1220  */
1221 static int
1222 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1223     struct in6_ifaddr *ia, int flags)
1224 {
1225 	struct in6_multi *in6m_sol;
1226 	int error = 0;
1227 
1228 	/* Add local address to lltable, if necessary (ex. on p2p link). */
1229 	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1230 		in6_purgeaddr(&ia->ia_ifa);
1231 		ifa_free(&ia->ia_ifa);
1232 		return (error);
1233 	}
1234 
1235 	/* Join necessary multicast groups. */
1236 	in6m_sol = NULL;
1237 	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1238 		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1239 		if (error != 0) {
1240 			in6_purgeaddr(&ia->ia_ifa);
1241 			ifa_free(&ia->ia_ifa);
1242 			return (error);
1243 		}
1244 	}
1245 
1246 	/* Perform DAD, if the address is TENTATIVE. */
1247 	if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1248 		int delay, mindelay, maxdelay;
1249 
1250 		delay = 0;
1251 		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1252 			/*
1253 			 * We need to impose a delay before sending an NS
1254 			 * for DAD.  Check if we also needed a delay for the
1255 			 * corresponding MLD message.  If we did, the delay
1256 			 * should be larger than the MLD delay (this could be
1257 			 * relaxed a bit, but this simple logic is at least
1258 			 * safe).
1259 			 * XXX: Break data hiding guidelines and look at
1260 			 * state for the solicited multicast group.
1261 			 */
1262 			mindelay = 0;
1263 			if (in6m_sol != NULL &&
1264 			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1265 				mindelay = in6m_sol->in6m_timer;
1266 			}
1267 			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1268 			if (maxdelay - mindelay == 0)
1269 				delay = 0;
1270 			else {
1271 				delay =
1272 				    (arc4random() % (maxdelay - mindelay)) +
1273 				    mindelay;
1274 			}
1275 		}
1276 		nd6_dad_start((struct ifaddr *)ia, delay);
1277 	}
1278 
1279 	in6_newaddrmsg(ia, RTM_ADD);
1280 	ifa_free(&ia->ia_ifa);
1281 	return (error);
1282 }
1283 
1284 void
1285 in6_purgeaddr(struct ifaddr *ifa)
1286 {
1287 	struct ifnet *ifp = ifa->ifa_ifp;
1288 	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1289 	struct in6_multi_mship *imm;
1290 	int plen, error;
1291 
1292 	if (ifa->ifa_carp)
1293 		(*carp_detach_p)(ifa);
1294 
1295 	/*
1296 	 * Remove the loopback route to the interface address.
1297 	 * The check for the current setting of "nd6_useloopback"
1298 	 * is not needed.
1299 	 */
1300 	if (ia->ia_flags & IFA_RTSELF) {
1301 		error = ifa_del_loopback_route((struct ifaddr *)ia,
1302 		    (struct sockaddr *)&ia->ia_addr);
1303 		if (error == 0)
1304 			ia->ia_flags &= ~IFA_RTSELF;
1305 	}
1306 
1307 	/* stop DAD processing */
1308 	nd6_dad_stop(ifa);
1309 
1310 	/* Remove local address entry from lltable. */
1311 	nd6_rem_ifa_lle(ia);
1312 
1313 	/* Leave multicast groups. */
1314 	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1315 		LIST_REMOVE(imm, i6mm_chain);
1316 		in6_leavegroup(imm);
1317 	}
1318 	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1319 	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1320 		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1321 		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1322 		if (error != 0)
1323 			log(LOG_INFO, "%s: err=%d, destination address delete "
1324 			    "failed\n", __func__, error);
1325 		ia->ia_flags &= ~IFA_ROUTE;
1326 	}
1327 
1328 	in6_newaddrmsg(ia, RTM_DELETE);
1329 	in6_unlink_ifa(ia, ifp);
1330 }
1331 
1332 static void
1333 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1334 {
1335 	char ip6buf[INET6_ADDRSTRLEN];
1336 
1337 	IF_ADDR_WLOCK(ifp);
1338 	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1339 	IF_ADDR_WUNLOCK(ifp);
1340 	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1341 
1342 	/*
1343 	 * Defer the release of what might be the last reference to the
1344 	 * in6_ifaddr so that it can't be freed before the remainder of the
1345 	 * cleanup.
1346 	 */
1347 	IN6_IFADDR_WLOCK();
1348 	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1349 	LIST_REMOVE(ia, ia6_hash);
1350 	IN6_IFADDR_WUNLOCK();
1351 
1352 	/*
1353 	 * Release the reference to the base prefix.  There should be a
1354 	 * positive reference.
1355 	 */
1356 	if (ia->ia6_ndpr == NULL) {
1357 		nd6log((LOG_NOTICE,
1358 		    "in6_unlink_ifa: autoconf'ed address "
1359 		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1360 	} else {
1361 		ia->ia6_ndpr->ndpr_refcnt--;
1362 		ia->ia6_ndpr = NULL;
1363 	}
1364 
1365 	/*
1366 	 * Also, if the address being removed is autoconf'ed, call
1367 	 * pfxlist_onlink_check() since the release might affect the status of
1368 	 * other (detached) addresses.
1369 	 */
1370 	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1371 		pfxlist_onlink_check();
1372 	}
1373 	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1374 }
1375 
1376 /*
1377  * Notifies other subsystems about address change/arrival:
1378  * 1) Notifies device handler on the first IPv6 address assignment
1379  * 2) Handle routing table changes for P2P links and route
1380  * 3) Handle routing table changes for address host route
1381  */
1382 static int
1383 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1384     struct in6_aliasreq *ifra, int hostIsNew)
1385 {
1386 	int	error = 0, plen, ifacount = 0;
1387 	struct ifaddr *ifa;
1388 	struct sockaddr_in6 *pdst;
1389 	char ip6buf[INET6_ADDRSTRLEN];
1390 
1391 	/*
1392 	 * Give the interface a chance to initialize
1393 	 * if this is its first address,
1394 	 */
1395 	if (hostIsNew != 0) {
1396 		IF_ADDR_RLOCK(ifp);
1397 		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1398 			if (ifa->ifa_addr->sa_family != AF_INET6)
1399 				continue;
1400 			ifacount++;
1401 		}
1402 		IF_ADDR_RUNLOCK(ifp);
1403 	}
1404 
1405 	if (ifacount <= 1 && ifp->if_ioctl) {
1406 		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1407 		if (error)
1408 			return (error);
1409 	}
1410 
1411 	/*
1412 	 * If a new destination address is specified, scrub the old one and
1413 	 * install the new destination.  Note that the interface must be
1414 	 * p2p or loopback.
1415 	 */
1416 	pdst = &ifra->ifra_dstaddr;
1417 	if (pdst->sin6_family == AF_INET6 &&
1418 	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1419 		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1420 		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1421 			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1422 			    "remove a route to the old destination: %s\n",
1423 			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1424 			/* proceed anyway... */
1425 		} else
1426 			ia->ia_flags &= ~IFA_ROUTE;
1427 		ia->ia_dstaddr = *pdst;
1428 	}
1429 
1430 	/*
1431 	 * If a new destination address is specified for a point-to-point
1432 	 * interface, install a route to the destination as an interface
1433 	 * direct route.
1434 	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1435 	 * interface that share the same destination.
1436 	 */
1437 	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1438 	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1439 	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1440 		int rtflags = RTF_UP | RTF_HOST;
1441 		/*
1442 		 * Handle the case for ::1 .
1443 		 */
1444 		if (ifp->if_flags & IFF_LOOPBACK)
1445 			ia->ia_flags |= IFA_RTSELF;
1446 		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1447 		if (error)
1448 			return (error);
1449 		ia->ia_flags |= IFA_ROUTE;
1450 	}
1451 
1452 	/*
1453 	 * add a loopback route to self if not exists
1454 	 */
1455 	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1456 		error = ifa_add_loopback_route((struct ifaddr *)ia,
1457 		    (struct sockaddr *)&ia->ia_addr);
1458 		if (error == 0)
1459 			ia->ia_flags |= IFA_RTSELF;
1460 	}
1461 
1462 	return (error);
1463 }
1464 
1465 /*
1466  * Find an IPv6 interface link-local address specific to an interface.
1467  * ifaddr is returned referenced.
1468  */
1469 struct in6_ifaddr *
1470 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1471 {
1472 	struct ifaddr *ifa;
1473 
1474 	IF_ADDR_RLOCK(ifp);
1475 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1476 		if (ifa->ifa_addr->sa_family != AF_INET6)
1477 			continue;
1478 		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1479 			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1480 			    ignoreflags) != 0)
1481 				continue;
1482 			ifa_ref(ifa);
1483 			break;
1484 		}
1485 	}
1486 	IF_ADDR_RUNLOCK(ifp);
1487 
1488 	return ((struct in6_ifaddr *)ifa);
1489 }
1490 
1491 
1492 /*
1493  * find the internet address corresponding to a given address.
1494  * ifaddr is returned referenced.
1495  */
1496 struct in6_ifaddr *
1497 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1498 {
1499 	struct rm_priotracker in6_ifa_tracker;
1500 	struct in6_ifaddr *ia;
1501 
1502 	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1503 	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1504 		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1505 			if (zoneid != 0 &&
1506 			    zoneid != ia->ia_addr.sin6_scope_id)
1507 				continue;
1508 			ifa_ref(&ia->ia_ifa);
1509 			break;
1510 		}
1511 	}
1512 	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1513 	return (ia);
1514 }
1515 
1516 /*
1517  * find the internet address corresponding to a given interface and address.
1518  * ifaddr is returned referenced.
1519  */
1520 struct in6_ifaddr *
1521 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1522 {
1523 	struct ifaddr *ifa;
1524 
1525 	IF_ADDR_RLOCK(ifp);
1526 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1527 		if (ifa->ifa_addr->sa_family != AF_INET6)
1528 			continue;
1529 		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1530 			ifa_ref(ifa);
1531 			break;
1532 		}
1533 	}
1534 	IF_ADDR_RUNLOCK(ifp);
1535 
1536 	return ((struct in6_ifaddr *)ifa);
1537 }
1538 
1539 /*
1540  * Find a link-local scoped address on ifp and return it if any.
1541  */
1542 struct in6_ifaddr *
1543 in6ifa_llaonifp(struct ifnet *ifp)
1544 {
1545 	struct sockaddr_in6 *sin6;
1546 	struct ifaddr *ifa;
1547 
1548 	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1549 		return (NULL);
1550 	if_addr_rlock(ifp);
1551 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1552 		if (ifa->ifa_addr->sa_family != AF_INET6)
1553 			continue;
1554 		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1555 		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1556 		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1557 		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1558 			break;
1559 	}
1560 	if_addr_runlock(ifp);
1561 
1562 	return ((struct in6_ifaddr *)ifa);
1563 }
1564 
1565 /*
1566  * Convert IP6 address to printable (loggable) representation. Caller
1567  * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1568  */
1569 static char digits[] = "0123456789abcdef";
1570 char *
1571 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1572 {
1573 	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1574 	char *cp;
1575 	const u_int16_t *a = (const u_int16_t *)addr;
1576 	const u_int8_t *d;
1577 	int dcolon = 0, zero = 0;
1578 
1579 	cp = ip6buf;
1580 
1581 	for (i = 0; i < 8; i++) {
1582 		if (*(a + i) == 0) {
1583 			cnt++;
1584 			if (cnt == 1)
1585 				idx = i;
1586 		}
1587 		else if (maxcnt < cnt) {
1588 			maxcnt = cnt;
1589 			index = idx;
1590 			cnt = 0;
1591 		}
1592 	}
1593 	if (maxcnt < cnt) {
1594 		maxcnt = cnt;
1595 		index = idx;
1596 	}
1597 
1598 	for (i = 0; i < 8; i++) {
1599 		if (dcolon == 1) {
1600 			if (*a == 0) {
1601 				if (i == 7)
1602 					*cp++ = ':';
1603 				a++;
1604 				continue;
1605 			} else
1606 				dcolon = 2;
1607 		}
1608 		if (*a == 0) {
1609 			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1610 				if (i == 0)
1611 					*cp++ = ':';
1612 				*cp++ = ':';
1613 				dcolon = 1;
1614 			} else {
1615 				*cp++ = '0';
1616 				*cp++ = ':';
1617 			}
1618 			a++;
1619 			continue;
1620 		}
1621 		d = (const u_char *)a;
1622 		/* Try to eliminate leading zeros in printout like in :0001. */
1623 		zero = 1;
1624 		*cp = digits[*d >> 4];
1625 		if (*cp != '0') {
1626 			zero = 0;
1627 			cp++;
1628 		}
1629 		*cp = digits[*d++ & 0xf];
1630 		if (zero == 0 || (*cp != '0')) {
1631 			zero = 0;
1632 			cp++;
1633 		}
1634 		*cp = digits[*d >> 4];
1635 		if (zero == 0 || (*cp != '0')) {
1636 			zero = 0;
1637 			cp++;
1638 		}
1639 		*cp++ = digits[*d & 0xf];
1640 		*cp++ = ':';
1641 		a++;
1642 	}
1643 	*--cp = '\0';
1644 	return (ip6buf);
1645 }
1646 
1647 int
1648 in6_localaddr(struct in6_addr *in6)
1649 {
1650 	struct rm_priotracker in6_ifa_tracker;
1651 	struct in6_ifaddr *ia;
1652 
1653 	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1654 		return 1;
1655 
1656 	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1657 	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1658 		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1659 		    &ia->ia_prefixmask.sin6_addr)) {
1660 			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1661 			return 1;
1662 		}
1663 	}
1664 	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1665 
1666 	return (0);
1667 }
1668 
1669 /*
1670  * Return 1 if an internet address is for the local host and configured
1671  * on one of its interfaces.
1672  */
1673 int
1674 in6_localip(struct in6_addr *in6)
1675 {
1676 	struct rm_priotracker in6_ifa_tracker;
1677 	struct in6_ifaddr *ia;
1678 
1679 	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1680 	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1681 		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1682 			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1683 			return (1);
1684 		}
1685 	}
1686 	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1687 	return (0);
1688 }
1689 
1690 /*
1691  * Return 1 if an internet address is configured on an interface.
1692  */
1693 int
1694 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1695 {
1696 	struct in6_addr in6;
1697 	struct ifaddr *ifa;
1698 	struct in6_ifaddr *ia6;
1699 
1700 	in6 = *addr;
1701 	if (in6_clearscope(&in6))
1702 		return (0);
1703 	in6_setscope(&in6, ifp, NULL);
1704 
1705 	IF_ADDR_RLOCK(ifp);
1706 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1707 		if (ifa->ifa_addr->sa_family != AF_INET6)
1708 			continue;
1709 		ia6 = (struct in6_ifaddr *)ifa;
1710 		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1711 			IF_ADDR_RUNLOCK(ifp);
1712 			return (1);
1713 		}
1714 	}
1715 	IF_ADDR_RUNLOCK(ifp);
1716 
1717 	return (0);
1718 }
1719 
1720 int
1721 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1722 {
1723 	struct rm_priotracker in6_ifa_tracker;
1724 	struct in6_ifaddr *ia;
1725 
1726 	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1727 	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1728 		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1729 			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1730 				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1731 				return (1); /* true */
1732 			}
1733 			break;
1734 		}
1735 	}
1736 	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1737 
1738 	return (0);		/* false */
1739 }
1740 
1741 /*
1742  * return length of part which dst and src are equal
1743  * hard coding...
1744  */
1745 int
1746 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1747 {
1748 	int match = 0;
1749 	u_char *s = (u_char *)src, *d = (u_char *)dst;
1750 	u_char *lim = s + 16, r;
1751 
1752 	while (s < lim)
1753 		if ((r = (*d++ ^ *s++)) != 0) {
1754 			while (r < 128) {
1755 				match++;
1756 				r <<= 1;
1757 			}
1758 			break;
1759 		} else
1760 			match += 8;
1761 	return match;
1762 }
1763 
1764 /* XXX: to be scope conscious */
1765 int
1766 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1767 {
1768 	int bytelen, bitlen;
1769 
1770 	/* sanity check */
1771 	if (0 > len || len > 128) {
1772 		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1773 		    len);
1774 		return (0);
1775 	}
1776 
1777 	bytelen = len / 8;
1778 	bitlen = len % 8;
1779 
1780 	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1781 		return (0);
1782 	if (bitlen != 0 &&
1783 	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1784 	    p2->s6_addr[bytelen] >> (8 - bitlen))
1785 		return (0);
1786 
1787 	return (1);
1788 }
1789 
1790 void
1791 in6_prefixlen2mask(struct in6_addr *maskp, int len)
1792 {
1793 	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1794 	int bytelen, bitlen, i;
1795 
1796 	/* sanity check */
1797 	if (0 > len || len > 128) {
1798 		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1799 		    len);
1800 		return;
1801 	}
1802 
1803 	bzero(maskp, sizeof(*maskp));
1804 	bytelen = len / 8;
1805 	bitlen = len % 8;
1806 	for (i = 0; i < bytelen; i++)
1807 		maskp->s6_addr[i] = 0xff;
1808 	if (bitlen)
1809 		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1810 }
1811 
1812 /*
1813  * return the best address out of the same scope. if no address was
1814  * found, return the first valid address from designated IF.
1815  */
1816 struct in6_ifaddr *
1817 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1818 {
1819 	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1820 	struct ifaddr *ifa;
1821 	struct in6_ifaddr *besta = 0;
1822 	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1823 
1824 	dep[0] = dep[1] = NULL;
1825 
1826 	/*
1827 	 * We first look for addresses in the same scope.
1828 	 * If there is one, return it.
1829 	 * If two or more, return one which matches the dst longest.
1830 	 * If none, return one of global addresses assigned other ifs.
1831 	 */
1832 	IF_ADDR_RLOCK(ifp);
1833 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1834 		if (ifa->ifa_addr->sa_family != AF_INET6)
1835 			continue;
1836 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1837 			continue; /* XXX: is there any case to allow anycast? */
1838 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1839 			continue; /* don't use this interface */
1840 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1841 			continue;
1842 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1843 			if (V_ip6_use_deprecated)
1844 				dep[0] = (struct in6_ifaddr *)ifa;
1845 			continue;
1846 		}
1847 
1848 		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1849 			/*
1850 			 * call in6_matchlen() as few as possible
1851 			 */
1852 			if (besta) {
1853 				if (blen == -1)
1854 					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1855 				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1856 				if (tlen > blen) {
1857 					blen = tlen;
1858 					besta = (struct in6_ifaddr *)ifa;
1859 				}
1860 			} else
1861 				besta = (struct in6_ifaddr *)ifa;
1862 		}
1863 	}
1864 	if (besta) {
1865 		ifa_ref(&besta->ia_ifa);
1866 		IF_ADDR_RUNLOCK(ifp);
1867 		return (besta);
1868 	}
1869 
1870 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1871 		if (ifa->ifa_addr->sa_family != AF_INET6)
1872 			continue;
1873 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1874 			continue; /* XXX: is there any case to allow anycast? */
1875 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1876 			continue; /* don't use this interface */
1877 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1878 			continue;
1879 		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1880 			if (V_ip6_use_deprecated)
1881 				dep[1] = (struct in6_ifaddr *)ifa;
1882 			continue;
1883 		}
1884 
1885 		if (ifa != NULL)
1886 			ifa_ref(ifa);
1887 		IF_ADDR_RUNLOCK(ifp);
1888 		return (struct in6_ifaddr *)ifa;
1889 	}
1890 
1891 	/* use the last-resort values, that are, deprecated addresses */
1892 	if (dep[0]) {
1893 		ifa_ref((struct ifaddr *)dep[0]);
1894 		IF_ADDR_RUNLOCK(ifp);
1895 		return dep[0];
1896 	}
1897 	if (dep[1]) {
1898 		ifa_ref((struct ifaddr *)dep[1]);
1899 		IF_ADDR_RUNLOCK(ifp);
1900 		return dep[1];
1901 	}
1902 
1903 	IF_ADDR_RUNLOCK(ifp);
1904 	return NULL;
1905 }
1906 
1907 /*
1908  * perform DAD when interface becomes IFF_UP.
1909  */
1910 void
1911 in6_if_up(struct ifnet *ifp)
1912 {
1913 	struct ifaddr *ifa;
1914 	struct in6_ifaddr *ia;
1915 
1916 	IF_ADDR_RLOCK(ifp);
1917 	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1918 		if (ifa->ifa_addr->sa_family != AF_INET6)
1919 			continue;
1920 		ia = (struct in6_ifaddr *)ifa;
1921 		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1922 			/*
1923 			 * The TENTATIVE flag was likely set by hand
1924 			 * beforehand, implicitly indicating the need for DAD.
1925 			 * We may be able to skip the random delay in this
1926 			 * case, but we impose delays just in case.
1927 			 */
1928 			nd6_dad_start(ifa,
1929 			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1930 		}
1931 	}
1932 	IF_ADDR_RUNLOCK(ifp);
1933 
1934 	/*
1935 	 * special cases, like 6to4, are handled in in6_ifattach
1936 	 */
1937 	in6_ifattach(ifp, NULL);
1938 }
1939 
1940 int
1941 in6if_do_dad(struct ifnet *ifp)
1942 {
1943 	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1944 		return (0);
1945 
1946 	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1947 	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1948 		return (0);
1949 
1950 	/*
1951 	 * Our DAD routine requires the interface up and running.
1952 	 * However, some interfaces can be up before the RUNNING
1953 	 * status.  Additionaly, users may try to assign addresses
1954 	 * before the interface becomes up (or running).
1955 	 * This function returns EAGAIN in that case.
1956 	 * The caller should mark "tentative" on the address instead of
1957 	 * performing DAD immediately.
1958 	 */
1959 	if (!((ifp->if_flags & IFF_UP) &&
1960 	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1961 		return (EAGAIN);
1962 
1963 	return (1);
1964 }
1965 
1966 /*
1967  * Calculate max IPv6 MTU through all the interfaces and store it
1968  * to in6_maxmtu.
1969  */
1970 void
1971 in6_setmaxmtu(void)
1972 {
1973 	unsigned long maxmtu = 0;
1974 	struct ifnet *ifp;
1975 
1976 	IFNET_RLOCK_NOSLEEP();
1977 	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1978 		/* this function can be called during ifnet initialization */
1979 		if (!ifp->if_afdata[AF_INET6])
1980 			continue;
1981 		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1982 		    IN6_LINKMTU(ifp) > maxmtu)
1983 			maxmtu = IN6_LINKMTU(ifp);
1984 	}
1985 	IFNET_RUNLOCK_NOSLEEP();
1986 	if (maxmtu)	/* update only when maxmtu is positive */
1987 		V_in6_maxmtu = maxmtu;
1988 }
1989 
1990 /*
1991  * Provide the length of interface identifiers to be used for the link attached
1992  * to the given interface.  The length should be defined in "IPv6 over
1993  * xxx-link" document.  Note that address architecture might also define
1994  * the length for a particular set of address prefixes, regardless of the
1995  * link type.  As clarified in rfc2462bis, those two definitions should be
1996  * consistent, and those really are as of August 2004.
1997  */
1998 int
1999 in6_if2idlen(struct ifnet *ifp)
2000 {
2001 	switch (ifp->if_type) {
2002 	case IFT_ETHER:		/* RFC2464 */
2003 	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2004 	case IFT_L2VLAN:	/* ditto */
2005 	case IFT_IEEE80211:	/* ditto */
2006 	case IFT_INFINIBAND:
2007 		return (64);
2008 	case IFT_FDDI:		/* RFC2467 */
2009 		return (64);
2010 	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2011 		return (64);
2012 	case IFT_PPP:		/* RFC2472 */
2013 		return (64);
2014 	case IFT_ARCNET:	/* RFC2497 */
2015 		return (64);
2016 	case IFT_FRELAY:	/* RFC2590 */
2017 		return (64);
2018 	case IFT_IEEE1394:	/* RFC3146 */
2019 		return (64);
2020 	case IFT_GIF:
2021 		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2022 	case IFT_LOOP:
2023 		return (64);	/* XXX: is this really correct? */
2024 	default:
2025 		/*
2026 		 * Unknown link type:
2027 		 * It might be controversial to use the today's common constant
2028 		 * of 64 for these cases unconditionally.  For full compliance,
2029 		 * we should return an error in this case.  On the other hand,
2030 		 * if we simply miss the standard for the link type or a new
2031 		 * standard is defined for a new link type, the IFID length
2032 		 * is very likely to be the common constant.  As a compromise,
2033 		 * we always use the constant, but make an explicit notice
2034 		 * indicating the "unknown" case.
2035 		 */
2036 		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2037 		return (64);
2038 	}
2039 }
2040 
2041 #include <sys/sysctl.h>
2042 
2043 struct in6_llentry {
2044 	struct llentry		base;
2045 };
2046 
2047 #define	IN6_LLTBL_DEFAULT_HSIZE	32
2048 #define	IN6_LLTBL_HASH(k, h) \
2049 	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2050 
2051 /*
2052  * Do actual deallocation of @lle.
2053  * Called by LLE_FREE_LOCKED when number of references
2054  * drops to zero.
2055  */
2056 static void
2057 in6_lltable_destroy_lle(struct llentry *lle)
2058 {
2059 
2060 	LLE_WUNLOCK(lle);
2061 	LLE_LOCK_DESTROY(lle);
2062 	free(lle, M_LLTABLE);
2063 }
2064 
2065 static struct llentry *
2066 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2067 {
2068 	struct in6_llentry *lle;
2069 
2070 	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2071 	if (lle == NULL)		/* NB: caller generates msg */
2072 		return NULL;
2073 
2074 	lle->base.r_l3addr.addr6 = *addr6;
2075 	lle->base.lle_refcnt = 1;
2076 	lle->base.lle_free = in6_lltable_destroy_lle;
2077 	LLE_LOCK_INIT(&lle->base);
2078 	callout_init(&lle->base.lle_timer, 1);
2079 
2080 	return (&lle->base);
2081 }
2082 
2083 static int
2084 in6_lltable_match_prefix(const struct sockaddr *prefix,
2085     const struct sockaddr *mask, u_int flags, struct llentry *lle)
2086 {
2087 	const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2088 	const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2089 
2090 	if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6,
2091 	    &pfx->sin6_addr, &msk->sin6_addr) &&
2092 	    ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)))
2093 		return (1);
2094 
2095 	return (0);
2096 }
2097 
2098 static void
2099 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2100 {
2101 	struct ifnet *ifp;
2102 
2103 	LLE_WLOCK_ASSERT(lle);
2104 	KASSERT(llt != NULL, ("lltable is NULL"));
2105 
2106 	/* Unlink entry from table */
2107 	if ((lle->la_flags & LLE_LINKED) != 0) {
2108 
2109 		ifp = llt->llt_ifp;
2110 		IF_AFDATA_WLOCK_ASSERT(ifp);
2111 		lltable_unlink_entry(llt, lle);
2112 	}
2113 
2114 	if (callout_stop(&lle->lle_timer))
2115 		LLE_REMREF(lle);
2116 
2117 	llentry_free(lle);
2118 }
2119 
2120 static int
2121 in6_lltable_rtcheck(struct ifnet *ifp,
2122 		    u_int flags,
2123 		    const struct sockaddr *l3addr)
2124 {
2125 	struct rtentry *rt;
2126 	char ip6buf[INET6_ADDRSTRLEN];
2127 
2128 	KASSERT(l3addr->sa_family == AF_INET6,
2129 	    ("sin_family %d", l3addr->sa_family));
2130 
2131 	/* Our local addresses are always only installed on the default FIB. */
2132 	/* XXX rtalloc1 should take a const param */
2133 	rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2134 	    RT_DEFAULT_FIB);
2135 	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2136 		struct ifaddr *ifa;
2137 		/*
2138 		 * Create an ND6 cache for an IPv6 neighbor
2139 		 * that is not covered by our own prefix.
2140 		 */
2141 		ifa = ifaof_ifpforaddr(l3addr, ifp);
2142 		if (ifa != NULL) {
2143 			ifa_free(ifa);
2144 			if (rt != NULL)
2145 				RTFREE_LOCKED(rt);
2146 			return 0;
2147 		}
2148 		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2149 		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2150 		if (rt != NULL)
2151 			RTFREE_LOCKED(rt);
2152 		return EINVAL;
2153 	}
2154 	RTFREE_LOCKED(rt);
2155 	return 0;
2156 }
2157 
2158 static inline uint32_t
2159 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2160 {
2161 
2162 	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2163 }
2164 
2165 static uint32_t
2166 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2167 {
2168 
2169 	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2170 }
2171 
2172 static void
2173 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2174 {
2175 	struct sockaddr_in6 *sin6;
2176 
2177 	sin6 = (struct sockaddr_in6 *)sa;
2178 	bzero(sin6, sizeof(*sin6));
2179 	sin6->sin6_family = AF_INET6;
2180 	sin6->sin6_len = sizeof(*sin6);
2181 	sin6->sin6_addr = lle->r_l3addr.addr6;
2182 }
2183 
2184 static inline struct llentry *
2185 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2186 {
2187 	struct llentry *lle;
2188 	struct llentries *lleh;
2189 	u_int hashidx;
2190 
2191 	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2192 	lleh = &llt->lle_head[hashidx];
2193 	LIST_FOREACH(lle, lleh, lle_next) {
2194 		if (lle->la_flags & LLE_DELETED)
2195 			continue;
2196 		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2197 			break;
2198 	}
2199 
2200 	return (lle);
2201 }
2202 
2203 static int
2204 in6_lltable_delete(struct lltable *llt, u_int flags,
2205 	const struct sockaddr *l3addr)
2206 {
2207 	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2208 	struct llentry *lle;
2209 
2210 	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2211 	KASSERT(l3addr->sa_family == AF_INET6,
2212 	    ("sin_family %d", l3addr->sa_family));
2213 
2214 	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2215 
2216 	if (lle == NULL)
2217 		return (ENOENT);
2218 
2219 	if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2220 		LLE_WLOCK(lle);
2221 		lle->la_flags |= LLE_DELETED;
2222 		EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2223 #ifdef DIAGNOSTIC
2224 		log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2225 #endif
2226 		if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2227 			llentry_free(lle);
2228 		else
2229 			LLE_WUNLOCK(lle);
2230 	}
2231 
2232 	return (0);
2233 }
2234 
2235 static struct llentry *
2236 in6_lltable_alloc(struct lltable *llt, u_int flags,
2237 	const struct sockaddr *l3addr)
2238 {
2239 	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2240 	struct ifnet *ifp = llt->llt_ifp;
2241 	struct llentry *lle;
2242 
2243 	KASSERT(l3addr->sa_family == AF_INET6,
2244 	    ("sin_family %d", l3addr->sa_family));
2245 
2246 	/*
2247 	 * A route that covers the given address must have
2248 	 * been installed 1st because we are doing a resolution,
2249 	 * verify this.
2250 	 */
2251 	if (!(flags & LLE_IFADDR) &&
2252 	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2253 		return (NULL);
2254 
2255 	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2256 	if (lle == NULL) {
2257 		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2258 		return (NULL);
2259 	}
2260 	lle->la_flags = flags;
2261 	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2262 		bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2263 		lle->la_flags |= (LLE_VALID | LLE_STATIC);
2264 	}
2265 
2266 	if ((lle->la_flags & LLE_STATIC) != 0)
2267 		lle->ln_state = ND6_LLINFO_REACHABLE;
2268 
2269 	return (lle);
2270 }
2271 
2272 static struct llentry *
2273 in6_lltable_lookup(struct lltable *llt, u_int flags,
2274 	const struct sockaddr *l3addr)
2275 {
2276 	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2277 	struct llentry *lle;
2278 
2279 	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2280 	KASSERT(l3addr->sa_family == AF_INET6,
2281 	    ("sin_family %d", l3addr->sa_family));
2282 
2283 	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2284 
2285 	if (lle == NULL)
2286 		return (NULL);
2287 
2288 	if (flags & LLE_EXCLUSIVE)
2289 		LLE_WLOCK(lle);
2290 	else
2291 		LLE_RLOCK(lle);
2292 	return (lle);
2293 }
2294 
2295 static int
2296 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2297     struct sysctl_req *wr)
2298 {
2299 	struct ifnet *ifp = llt->llt_ifp;
2300 	/* XXX stack use */
2301 	struct {
2302 		struct rt_msghdr	rtm;
2303 		struct sockaddr_in6	sin6;
2304 		/*
2305 		 * ndp.c assumes that sdl is word aligned
2306 		 */
2307 #ifdef __LP64__
2308 		uint32_t		pad;
2309 #endif
2310 		struct sockaddr_dl	sdl;
2311 	} ndpc;
2312 	struct sockaddr_dl *sdl;
2313 	int error;
2314 
2315 	bzero(&ndpc, sizeof(ndpc));
2316 			/* skip deleted entries */
2317 			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2318 				return (0);
2319 			/* Skip if jailed and not a valid IP of the prison. */
2320 			lltable_fill_sa_entry(lle,
2321 			    (struct sockaddr *)&ndpc.sin6);
2322 			if (prison_if(wr->td->td_ucred,
2323 			    (struct sockaddr *)&ndpc.sin6) != 0)
2324 				return (0);
2325 			/*
2326 			 * produce a msg made of:
2327 			 *  struct rt_msghdr;
2328 			 *  struct sockaddr_in6 (IPv6)
2329 			 *  struct sockaddr_dl;
2330 			 */
2331 			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2332 			ndpc.rtm.rtm_version = RTM_VERSION;
2333 			ndpc.rtm.rtm_type = RTM_GET;
2334 			ndpc.rtm.rtm_flags = RTF_UP;
2335 			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2336 			if (V_deembed_scopeid)
2337 				sa6_recoverscope(&ndpc.sin6);
2338 
2339 			/* publish */
2340 			if (lle->la_flags & LLE_PUB)
2341 				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2342 
2343 			sdl = &ndpc.sdl;
2344 			sdl->sdl_family = AF_LINK;
2345 			sdl->sdl_len = sizeof(*sdl);
2346 			sdl->sdl_alen = ifp->if_addrlen;
2347 			sdl->sdl_index = ifp->if_index;
2348 			sdl->sdl_type = ifp->if_type;
2349 			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2350 			ndpc.rtm.rtm_rmx.rmx_expire =
2351 			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2352 			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2353 			if (lle->la_flags & LLE_STATIC)
2354 				ndpc.rtm.rtm_flags |= RTF_STATIC;
2355 			ndpc.rtm.rtm_index = ifp->if_index;
2356 			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2357 
2358 	return (error);
2359 }
2360 
2361 static struct lltable *
2362 in6_lltattach(struct ifnet *ifp)
2363 {
2364 	struct lltable *llt;
2365 
2366 	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2367 	llt->llt_af = AF_INET6;
2368 	llt->llt_ifp = ifp;
2369 
2370 	llt->llt_lookup = in6_lltable_lookup;
2371 	llt->llt_alloc_entry = in6_lltable_alloc;
2372 	llt->llt_delete = in6_lltable_delete;
2373 	llt->llt_dump_entry = in6_lltable_dump_entry;
2374 	llt->llt_hash = in6_lltable_hash;
2375 	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2376 	llt->llt_free_entry = in6_lltable_free_entry;
2377 	llt->llt_match_prefix = in6_lltable_match_prefix;
2378  	lltable_link(llt);
2379 
2380 	return (llt);
2381 }
2382 
2383 void *
2384 in6_domifattach(struct ifnet *ifp)
2385 {
2386 	struct in6_ifextra *ext;
2387 
2388 	/* There are not IPv6-capable interfaces. */
2389 	switch (ifp->if_type) {
2390 	case IFT_PFLOG:
2391 	case IFT_PFSYNC:
2392 	case IFT_USB:
2393 		return (NULL);
2394 	}
2395 	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2396 	bzero(ext, sizeof(*ext));
2397 
2398 	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2399 	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2400 	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2401 	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2402 
2403 	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2404 	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2405 	    M_WAITOK);
2406 	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2407 	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2408 
2409 	ext->nd_ifinfo = nd6_ifattach(ifp);
2410 	ext->scope6_id = scope6_ifattach(ifp);
2411 	ext->lltable = in6_lltattach(ifp);
2412 
2413 	ext->mld_ifinfo = mld_domifattach(ifp);
2414 
2415 	return ext;
2416 }
2417 
2418 int
2419 in6_domifmtu(struct ifnet *ifp)
2420 {
2421 
2422 	return (IN6_LINKMTU(ifp));
2423 }
2424 
2425 void
2426 in6_domifdetach(struct ifnet *ifp, void *aux)
2427 {
2428 	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2429 
2430 	mld_domifdetach(ifp);
2431 	scope6_ifdetach(ext->scope6_id);
2432 	nd6_ifdetach(ext->nd_ifinfo);
2433 	lltable_free(ext->lltable);
2434 	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2435 	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2436 	free(ext->in6_ifstat, M_IFADDR);
2437 	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2438 	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2439 	free(ext->icmp6_ifstat, M_IFADDR);
2440 	free(ext, M_IFADDR);
2441 }
2442 
2443 /*
2444  * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2445  * v4 mapped addr or v4 compat addr
2446  */
2447 void
2448 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2449 {
2450 
2451 	bzero(sin, sizeof(*sin));
2452 	sin->sin_len = sizeof(struct sockaddr_in);
2453 	sin->sin_family = AF_INET;
2454 	sin->sin_port = sin6->sin6_port;
2455 	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2456 }
2457 
2458 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2459 void
2460 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2461 {
2462 	bzero(sin6, sizeof(*sin6));
2463 	sin6->sin6_len = sizeof(struct sockaddr_in6);
2464 	sin6->sin6_family = AF_INET6;
2465 	sin6->sin6_port = sin->sin_port;
2466 	sin6->sin6_addr.s6_addr32[0] = 0;
2467 	sin6->sin6_addr.s6_addr32[1] = 0;
2468 	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2469 	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2470 }
2471 
2472 /* Convert sockaddr_in6 into sockaddr_in. */
2473 void
2474 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2475 {
2476 	struct sockaddr_in *sin_p;
2477 	struct sockaddr_in6 sin6;
2478 
2479 	/*
2480 	 * Save original sockaddr_in6 addr and convert it
2481 	 * to sockaddr_in.
2482 	 */
2483 	sin6 = *(struct sockaddr_in6 *)nam;
2484 	sin_p = (struct sockaddr_in *)nam;
2485 	in6_sin6_2_sin(sin_p, &sin6);
2486 }
2487 
2488 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2489 void
2490 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2491 {
2492 	struct sockaddr_in *sin_p;
2493 	struct sockaddr_in6 *sin6_p;
2494 
2495 	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2496 	sin_p = (struct sockaddr_in *)*nam;
2497 	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2498 	free(*nam, M_SONAME);
2499 	*nam = (struct sockaddr *)sin6_p;
2500 }
2501