in6.c revision fc57e5b82d72057b5ac303a1428c254ce29034f1
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_fib.h>
111#include <netinet6/in6_pcb.h>
112
113VNET_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 */
119const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
120const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
121const struct in6_addr in6addr_nodelocal_allnodes =
122	IN6ADDR_NODELOCAL_ALLNODES_INIT;
123const struct in6_addr in6addr_linklocal_allnodes =
124	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
125const struct in6_addr in6addr_linklocal_allrouters =
126	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
127const struct in6_addr in6addr_linklocal_allv2routers =
128	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
129
130const struct in6_addr in6mask0 = IN6MASK0;
131const struct in6_addr in6mask32 = IN6MASK32;
132const struct in6_addr in6mask64 = IN6MASK64;
133const struct in6_addr in6mask96 = IN6MASK96;
134const struct in6_addr in6mask128 = IN6MASK128;
135
136const struct sockaddr_in6 sa6_any =
137	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
138
139static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
140	struct in6_aliasreq *, int);
141static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
142
143static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
144    struct in6_ifaddr *, int);
145static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
146    struct in6_aliasreq *, int flags);
147static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
148    struct in6_ifaddr *, int, int);
149static 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
156void
157in6_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
183int
184in6_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
220struct in6_ndifreq32 {
221	char ifname[IFNAMSIZ];
222	uint32_t ifindex;
223};
224#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
225#endif
226
227int
228in6_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 SIOCSIFALIFETIME_IN6:
364	case SIOCGIFSTAT_IN6:
365	case SIOCGIFSTAT_ICMP6:
366		sa6 = &ifr->ifr_addr;
367		break;
368	case SIOCSIFADDR:
369	case SIOCSIFBRDADDR:
370	case SIOCSIFDSTADDR:
371	case SIOCSIFNETMASK:
372		/*
373		 * Although we should pass any non-INET6 ioctl requests
374		 * down to driver, we filter some legacy INET requests.
375		 * Drivers trust SIOCSIFADDR et al to come from an already
376		 * privileged layer, and do not perform any credentials
377		 * checks or input validation.
378		 */
379		return (EINVAL);
380	default:
381		sa6 = NULL;
382		break;
383	}
384	if (sa6 && sa6->sin6_family == AF_INET6) {
385		if (sa6->sin6_scope_id != 0)
386			error = sa6_embedscope(sa6, 0);
387		else
388			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
389		if (error != 0)
390			return (error);
391		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
392		    &sa6->sin6_addr)) != 0)
393			return (error);
394		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
395	} else
396		ia = NULL;
397
398	switch (cmd) {
399	case SIOCSIFADDR_IN6:
400	case SIOCSIFDSTADDR_IN6:
401	case SIOCSIFNETMASK_IN6:
402		/*
403		 * Since IPv6 allows a node to assign multiple addresses
404		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
405		 */
406		/* we decided to obsolete this command (20000704) */
407		error = EINVAL;
408		goto out;
409
410	case SIOCDIFADDR_IN6:
411		/*
412		 * for IPv4, we look for existing in_ifaddr here to allow
413		 * "ifconfig if0 delete" to remove the first IPv4 address on
414		 * the interface.  For IPv6, as the spec allows multiple
415		 * interface address from the day one, we consider "remove the
416		 * first one" semantics to be not preferable.
417		 */
418		if (ia == NULL) {
419			error = EADDRNOTAVAIL;
420			goto out;
421		}
422		/* FALLTHROUGH */
423	case SIOCAIFADDR_IN6:
424		/*
425		 * We always require users to specify a valid IPv6 address for
426		 * the corresponding operation.
427		 */
428		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
429		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
430			error = EAFNOSUPPORT;
431			goto out;
432		}
433
434		if (td != NULL) {
435			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
436			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
437			if (error)
438				goto out;
439		}
440		/* FALLTHROUGH */
441	case SIOCGIFSTAT_IN6:
442	case SIOCGIFSTAT_ICMP6:
443		if (ifp->if_afdata[AF_INET6] == NULL) {
444			error = EPFNOSUPPORT;
445			goto out;
446		}
447		break;
448
449	case SIOCGIFADDR_IN6:
450		/* This interface is basically deprecated. use SIOCGIFCONF. */
451		/* FALLTHROUGH */
452	case SIOCGIFAFLAG_IN6:
453	case SIOCGIFNETMASK_IN6:
454	case SIOCGIFDSTADDR_IN6:
455	case SIOCGIFALIFETIME_IN6:
456		/* must think again about its semantics */
457		if (ia == NULL) {
458			error = EADDRNOTAVAIL;
459			goto out;
460		}
461		break;
462
463	case SIOCSIFALIFETIME_IN6:
464	    {
465		struct in6_addrlifetime *lt;
466
467		if (td != NULL) {
468			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
469			if (error)
470				goto out;
471		}
472		if (ia == NULL) {
473			error = EADDRNOTAVAIL;
474			goto out;
475		}
476		/* sanity for overflow - beware unsigned */
477		lt = &ifr->ifr_ifru.ifru_lifetime;
478		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
479		    lt->ia6t_vltime + time_uptime < time_uptime) {
480			error = EINVAL;
481			goto out;
482		}
483		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
484		    lt->ia6t_pltime + time_uptime < time_uptime) {
485			error = EINVAL;
486			goto out;
487		}
488		break;
489	    }
490	}
491
492	switch (cmd) {
493	case SIOCGIFADDR_IN6:
494		ifr->ifr_addr = ia->ia_addr;
495		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
496			goto out;
497		break;
498
499	case SIOCGIFDSTADDR_IN6:
500		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
501			error = EINVAL;
502			goto out;
503		}
504		/*
505		 * XXX: should we check if ifa_dstaddr is NULL and return
506		 * an error?
507		 */
508		ifr->ifr_dstaddr = ia->ia_dstaddr;
509		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
510			goto out;
511		break;
512
513	case SIOCGIFNETMASK_IN6:
514		ifr->ifr_addr = ia->ia_prefixmask;
515		break;
516
517	case SIOCGIFAFLAG_IN6:
518		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
519		break;
520
521	case SIOCGIFSTAT_IN6:
522		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
523		    ifp->if_afdata[AF_INET6])->in6_ifstat,
524		    &ifr->ifr_ifru.ifru_stat,
525		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
526		break;
527
528	case SIOCGIFSTAT_ICMP6:
529		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
530		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
531		    &ifr->ifr_ifru.ifru_icmp6stat,
532		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
533		break;
534
535	case SIOCGIFALIFETIME_IN6:
536		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
537		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
538			time_t maxexpire;
539			struct in6_addrlifetime *retlt =
540			    &ifr->ifr_ifru.ifru_lifetime;
541
542			/*
543			 * XXX: adjust expiration time assuming time_t is
544			 * signed.
545			 */
546			maxexpire = (-1) &
547			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
548			if (ia->ia6_lifetime.ia6t_vltime <
549			    maxexpire - ia->ia6_updatetime) {
550				retlt->ia6t_expire = ia->ia6_updatetime +
551				    ia->ia6_lifetime.ia6t_vltime;
552			} else
553				retlt->ia6t_expire = maxexpire;
554		}
555		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
556			time_t maxexpire;
557			struct in6_addrlifetime *retlt =
558			    &ifr->ifr_ifru.ifru_lifetime;
559
560			/*
561			 * XXX: adjust expiration time assuming time_t is
562			 * signed.
563			 */
564			maxexpire = (-1) &
565			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
566			if (ia->ia6_lifetime.ia6t_pltime <
567			    maxexpire - ia->ia6_updatetime) {
568				retlt->ia6t_preferred = ia->ia6_updatetime +
569				    ia->ia6_lifetime.ia6t_pltime;
570			} else
571				retlt->ia6t_preferred = maxexpire;
572		}
573		break;
574
575	case SIOCSIFALIFETIME_IN6:
576		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
577		/* for sanity */
578		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
579			ia->ia6_lifetime.ia6t_expire =
580				time_uptime + ia->ia6_lifetime.ia6t_vltime;
581		} else
582			ia->ia6_lifetime.ia6t_expire = 0;
583		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
584			ia->ia6_lifetime.ia6t_preferred =
585				time_uptime + ia->ia6_lifetime.ia6t_pltime;
586		} else
587			ia->ia6_lifetime.ia6t_preferred = 0;
588		break;
589
590	case SIOCAIFADDR_IN6:
591	{
592		struct nd_prefixctl pr0;
593		struct nd_prefix *pr;
594
595		/*
596		 * first, make or update the interface address structure,
597		 * and link it to the list.
598		 */
599		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
600			goto out;
601		if (ia != NULL)
602			ifa_free(&ia->ia_ifa);
603		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
604		    == NULL) {
605			/*
606			 * this can happen when the user specify the 0 valid
607			 * lifetime.
608			 */
609			break;
610		}
611
612		if (cmd == ocmd && ifra->ifra_vhid > 0) {
613			if (carp_attach_p != NULL)
614				error = (*carp_attach_p)(&ia->ia_ifa,
615				    ifra->ifra_vhid);
616			else
617				error = EPROTONOSUPPORT;
618			if (error)
619				goto out;
620			else
621				carp_attached = 1;
622		}
623
624		/*
625		 * then, make the prefix on-link on the interface.
626		 * XXX: we'd rather create the prefix before the address, but
627		 * we need at least one address to install the corresponding
628		 * interface route, so we configure the address first.
629		 */
630
631		/*
632		 * convert mask to prefix length (prefixmask has already
633		 * been validated in in6_update_ifa().
634		 */
635		bzero(&pr0, sizeof(pr0));
636		pr0.ndpr_ifp = ifp;
637		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
638		    NULL);
639		if (pr0.ndpr_plen == 128) {
640			/* we don't need to install a host route. */
641			goto aifaddr_out;
642		}
643		pr0.ndpr_prefix = ifra->ifra_addr;
644		/* apply the mask for safety. */
645		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
646		    &ifra->ifra_prefixmask.sin6_addr);
647
648		/*
649		 * XXX: since we don't have an API to set prefix (not address)
650		 * lifetimes, we just use the same lifetimes as addresses.
651		 * The (temporarily) installed lifetimes can be overridden by
652		 * later advertised RAs (when accept_rtadv is non 0), which is
653		 * an intended behavior.
654		 */
655		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
656		pr0.ndpr_raf_auto =
657		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
658		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
659		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
660
661		/* add the prefix if not yet. */
662		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
663			/*
664			 * nd6_prelist_add will install the corresponding
665			 * interface route.
666			 */
667			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
668				if (carp_attached)
669					(*carp_detach_p)(&ia->ia_ifa);
670				goto out;
671			}
672			if (pr == NULL) {
673				if (carp_attached)
674					(*carp_detach_p)(&ia->ia_ifa);
675				log(LOG_ERR, "nd6_prelist_add succeeded but "
676				    "no prefix\n");
677				error = EINVAL;
678				goto out;
679			}
680		}
681
682		/* relate the address to the prefix */
683		if (ia->ia6_ndpr == NULL) {
684			ia->ia6_ndpr = pr;
685			pr->ndpr_refcnt++;
686
687			/*
688			 * If this is the first autoconf address from the
689			 * prefix, create a temporary address as well
690			 * (when required).
691			 */
692			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
693			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
694				int e;
695				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
696					log(LOG_NOTICE, "in6_control: failed "
697					    "to create a temporary address, "
698					    "errno=%d\n", e);
699				}
700			}
701		}
702
703		/*
704		 * this might affect the status of autoconfigured addresses,
705		 * that is, this address might make other addresses detached.
706		 */
707		pfxlist_onlink_check();
708aifaddr_out:
709		if (error != 0 || ia == NULL)
710			break;
711		/*
712		 * Try to clear the flag when a new IPv6 address is added
713		 * onto an IFDISABLED interface and it succeeds.
714		 */
715		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
716			struct in6_ndireq nd;
717
718			memset(&nd, 0, sizeof(nd));
719			nd.ndi.flags = ND_IFINFO(ifp)->flags;
720			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
721			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
722				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
723				    "SIOCSIFINFO_FLAGS for -ifdisabled "
724				    "failed.");
725			/*
726			 * Ignore failure of clearing the flag intentionally.
727			 * The failure means address duplication was detected.
728			 */
729		}
730		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
731		break;
732	}
733
734	case SIOCDIFADDR_IN6:
735	{
736		struct nd_prefix *pr;
737
738		/*
739		 * If the address being deleted is the only one that owns
740		 * the corresponding prefix, expire the prefix as well.
741		 * XXX: theoretically, we don't have to worry about such
742		 * relationship, since we separate the address management
743		 * and the prefix management.  We do this, however, to provide
744		 * as much backward compatibility as possible in terms of
745		 * the ioctl operation.
746		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
747		 */
748		pr = ia->ia6_ndpr;
749		in6_purgeaddr(&ia->ia_ifa);
750		if (pr && pr->ndpr_refcnt == 0)
751			prelist_remove(pr);
752		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
753		break;
754	}
755
756	default:
757		if (ifp->if_ioctl == NULL) {
758			error = EOPNOTSUPP;
759			goto out;
760		}
761		error = (*ifp->if_ioctl)(ifp, cmd, data);
762		goto out;
763	}
764
765	error = 0;
766out:
767	if (ia != NULL)
768		ifa_free(&ia->ia_ifa);
769	return (error);
770}
771
772
773/*
774 * Join necessary multicast groups.  Factored out from in6_update_ifa().
775 * This entire work should only be done once, for the default FIB.
776 */
777static int
778in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
779    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
780{
781	char ip6buf[INET6_ADDRSTRLEN];
782	struct in6_addr mltaddr;
783	struct in6_multi_mship *imm;
784	int delay, error;
785
786	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
787
788	/* Join solicited multicast addr for new host id. */
789	bzero(&mltaddr, sizeof(struct in6_addr));
790	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
791	mltaddr.s6_addr32[2] = htonl(1);
792	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
793	mltaddr.s6_addr8[12] = 0xff;
794	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
795		/* XXX: should not happen */
796		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
797		goto cleanup;
798	}
799	delay = error = 0;
800	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
801		/*
802		 * We need a random delay for DAD on the address being
803		 * configured.  It also means delaying transmission of the
804		 * corresponding MLD report to avoid report collision.
805		 * [RFC 4861, Section 6.3.7]
806		 */
807		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
808	}
809	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
810	if (imm == NULL) {
811		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
812		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
813		    if_name(ifp), error));
814		goto cleanup;
815	}
816	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
817	*in6m_sol = imm->i6mm_maddr;
818
819	/*
820	 * Join link-local all-nodes address.
821	 */
822	mltaddr = in6addr_linklocal_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, &mltaddr),
830		    if_name(ifp), error));
831		goto cleanup;
832	}
833	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
834
835	/*
836	 * Join node information group address.
837	 */
838	delay = 0;
839	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
840		/*
841		 * The spec does not say anything about delay for this group,
842		 * but the same logic should apply.
843		 */
844		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
845	}
846	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
847		/* XXX jinmei */
848		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
849		if (imm == NULL)
850			nd6log((LOG_WARNING,
851			    "%s: in6_joingroup failed for %s on %s "
852			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
853			    &mltaddr), if_name(ifp), error));
854			/* XXX not very fatal, go on... */
855		else
856			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
857	}
858	if (V_icmp6_nodeinfo_oldmcprefix &&
859	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
860		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
861		if (imm == NULL)
862			nd6log((LOG_WARNING,
863			    "%s: in6_joingroup failed for %s on %s "
864			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
865			    &mltaddr), if_name(ifp), error));
866			/* XXX not very fatal, go on... */
867		else
868			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
869	}
870
871	/*
872	 * Join interface-local all-nodes address.
873	 * (ff01::1%ifN, and ff01::%ifN/32)
874	 */
875	mltaddr = in6addr_nodelocal_allnodes;
876	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
877		goto cleanup; /* XXX: should not fail */
878
879	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
880	if (imm == NULL) {
881		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
882		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
883		    &mltaddr), if_name(ifp), error));
884		goto cleanup;
885	}
886	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
887
888cleanup:
889	return (error);
890}
891
892/*
893 * Update parameters of an IPv6 interface address.
894 * If necessary, a new entry is created and linked into address chains.
895 * This function is separated from in6_control().
896 */
897int
898in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
899    struct in6_ifaddr *ia, int flags)
900{
901	int error, hostIsNew = 0;
902
903	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
904		return (error);
905
906	if (ia == NULL) {
907		hostIsNew = 1;
908		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
909			return (ENOBUFS);
910	}
911
912	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
913	if (error != 0) {
914		if (hostIsNew != 0) {
915			in6_unlink_ifa(ia, ifp);
916			ifa_free(&ia->ia_ifa);
917		}
918		return (error);
919	}
920
921	if (hostIsNew)
922		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
923
924	return (error);
925}
926
927/*
928 * Fill in basic IPv6 address request info.
929 */
930void
931in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
932    const struct in6_addr *mask)
933{
934
935	memset(ifra, 0, sizeof(struct in6_aliasreq));
936
937	ifra->ifra_addr.sin6_family = AF_INET6;
938	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
939	if (addr != NULL)
940		ifra->ifra_addr.sin6_addr = *addr;
941
942	ifra->ifra_prefixmask.sin6_family = AF_INET6;
943	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
944	if (mask != NULL)
945		ifra->ifra_prefixmask.sin6_addr = *mask;
946}
947
948static int
949in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
950    struct in6_ifaddr *ia, int flags)
951{
952	int plen = -1;
953	struct sockaddr_in6 dst6;
954	struct in6_addrlifetime *lt;
955	char ip6buf[INET6_ADDRSTRLEN];
956
957	/* Validate parameters */
958	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
959		return (EINVAL);
960
961	/*
962	 * The destination address for a p2p link must have a family
963	 * of AF_UNSPEC or AF_INET6.
964	 */
965	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
966	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
967	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
968		return (EAFNOSUPPORT);
969
970	/*
971	 * Validate address
972	 */
973	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
974	    ifra->ifra_addr.sin6_family != AF_INET6)
975		return (EINVAL);
976
977	/*
978	 * validate ifra_prefixmask.  don't check sin6_family, netmask
979	 * does not carry fields other than sin6_len.
980	 */
981	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
982		return (EINVAL);
983	/*
984	 * Because the IPv6 address architecture is classless, we require
985	 * users to specify a (non 0) prefix length (mask) for a new address.
986	 * We also require the prefix (when specified) mask is valid, and thus
987	 * reject a non-consecutive mask.
988	 */
989	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
990		return (EINVAL);
991	if (ifra->ifra_prefixmask.sin6_len != 0) {
992		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
993		    (u_char *)&ifra->ifra_prefixmask +
994		    ifra->ifra_prefixmask.sin6_len);
995		if (plen <= 0)
996			return (EINVAL);
997	} else {
998		/*
999		 * In this case, ia must not be NULL.  We just use its prefix
1000		 * length.
1001		 */
1002		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1003	}
1004	/*
1005	 * If the destination address on a p2p interface is specified,
1006	 * and the address is a scoped one, validate/set the scope
1007	 * zone identifier.
1008	 */
1009	dst6 = ifra->ifra_dstaddr;
1010	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1011	    (dst6.sin6_family == AF_INET6)) {
1012		struct in6_addr in6_tmp;
1013		u_int32_t zoneid;
1014
1015		in6_tmp = dst6.sin6_addr;
1016		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1017			return (EINVAL); /* XXX: should be impossible */
1018
1019		if (dst6.sin6_scope_id != 0) {
1020			if (dst6.sin6_scope_id != zoneid)
1021				return (EINVAL);
1022		} else		/* user omit to specify the ID. */
1023			dst6.sin6_scope_id = zoneid;
1024
1025		/* convert into the internal form */
1026		if (sa6_embedscope(&dst6, 0))
1027			return (EINVAL); /* XXX: should be impossible */
1028	}
1029	/* Modify original ifra_dstaddr to reflect changes */
1030	ifra->ifra_dstaddr = dst6;
1031
1032	/*
1033	 * The destination address can be specified only for a p2p or a
1034	 * loopback interface.  If specified, the corresponding prefix length
1035	 * must be 128.
1036	 */
1037	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1038		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1039			/* XXX: noisy message */
1040			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1041			    "be specified for a p2p or a loopback IF only\n"));
1042			return (EINVAL);
1043		}
1044		if (plen != 128) {
1045			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1046			    "be 128 when dstaddr is specified\n"));
1047			return (EINVAL);
1048		}
1049	}
1050	/* lifetime consistency check */
1051	lt = &ifra->ifra_lifetime;
1052	if (lt->ia6t_pltime > lt->ia6t_vltime)
1053		return (EINVAL);
1054	if (lt->ia6t_vltime == 0) {
1055		/*
1056		 * the following log might be noisy, but this is a typical
1057		 * configuration mistake or a tool's bug.
1058		 */
1059		nd6log((LOG_INFO,
1060		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1061		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1062
1063		if (ia == NULL)
1064			return (0); /* there's nothing to do */
1065	}
1066
1067	/* Check prefix mask */
1068	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1069		/*
1070		 * We prohibit changing the prefix length of an existing
1071		 * address, because
1072		 * + such an operation should be rare in IPv6, and
1073		 * + the operation would confuse prefix management.
1074		 */
1075		if (ia->ia_prefixmask.sin6_len != 0 &&
1076		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1077			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1078			    "of an existing %s address should not be changed\n",
1079			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1080
1081			return (EINVAL);
1082		}
1083	}
1084
1085	return (0);
1086}
1087
1088
1089/*
1090 * Allocate a new ifaddr and link it into chains.
1091 */
1092static struct in6_ifaddr *
1093in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1094{
1095	struct in6_ifaddr *ia;
1096
1097	/*
1098	 * When in6_alloc_ifa() is called in a process of a received
1099	 * RA, it is called under an interrupt context.  So, we should
1100	 * call malloc with M_NOWAIT.
1101	 */
1102	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1103	if (ia == NULL)
1104		return (NULL);
1105	LIST_INIT(&ia->ia6_memberships);
1106	/* Initialize the address and masks, and put time stamp */
1107	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1108	ia->ia_addr.sin6_family = AF_INET6;
1109	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1110	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1111	ia->ia_addr = ifra->ifra_addr;
1112	ia->ia6_createtime = time_uptime;
1113	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1114		/*
1115		 * Some functions expect that ifa_dstaddr is not
1116		 * NULL for p2p interfaces.
1117		 */
1118		ia->ia_ifa.ifa_dstaddr =
1119		    (struct sockaddr *)&ia->ia_dstaddr;
1120	} else {
1121		ia->ia_ifa.ifa_dstaddr = NULL;
1122	}
1123
1124	/* set prefix mask if any */
1125	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1126	if (ifra->ifra_prefixmask.sin6_len != 0) {
1127		ia->ia_prefixmask.sin6_family = AF_INET6;
1128		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1129		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1130	}
1131
1132	ia->ia_ifp = ifp;
1133	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1134	IF_ADDR_WLOCK(ifp);
1135	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1136	IF_ADDR_WUNLOCK(ifp);
1137
1138	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1139	IN6_IFADDR_WLOCK();
1140	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1141	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1142	IN6_IFADDR_WUNLOCK();
1143
1144	return (ia);
1145}
1146
1147/*
1148 * Update/configure interface address parameters:
1149 *
1150 * 1) Update lifetime
1151 * 2) Update interface metric ad flags
1152 * 3) Notify other subsystems
1153 */
1154static int
1155in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1156    struct in6_ifaddr *ia, int hostIsNew, int flags)
1157{
1158	int error;
1159
1160	/* update timestamp */
1161	ia->ia6_updatetime = time_uptime;
1162
1163	/*
1164	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1165	 * to see if the address is deprecated or invalidated, but initialize
1166	 * these members for applications.
1167	 */
1168	ia->ia6_lifetime = ifra->ifra_lifetime;
1169	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1170		ia->ia6_lifetime.ia6t_expire =
1171		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1172	} else
1173		ia->ia6_lifetime.ia6t_expire = 0;
1174	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1175		ia->ia6_lifetime.ia6t_preferred =
1176		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1177	} else
1178		ia->ia6_lifetime.ia6t_preferred = 0;
1179
1180	/*
1181	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1182	 * userland, make it deprecated.
1183	 */
1184	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1185		ia->ia6_lifetime.ia6t_pltime = 0;
1186		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1187	}
1188
1189	/*
1190	 * configure address flags.
1191	 */
1192	ia->ia6_flags = ifra->ifra_flags;
1193
1194	/*
1195	 * Make the address tentative before joining multicast addresses,
1196	 * so that corresponding MLD responses would not have a tentative
1197	 * source address.
1198	 */
1199	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1200
1201	/*
1202	 * DAD should be performed for an new address or addresses on
1203	 * an interface with ND6_IFF_IFDISABLED.
1204	 */
1205	if (in6if_do_dad(ifp) &&
1206	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1207		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1208
1209	/* notify other subsystems */
1210	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1211
1212	return (error);
1213}
1214
1215/*
1216 * Do link-level ifa job:
1217 * 1) Add lle entry for added address
1218 * 2) Notifies routing socket users about new address
1219 * 3) join appropriate multicast group
1220 * 4) start DAD if enabled
1221 */
1222static int
1223in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1224    struct in6_ifaddr *ia, int flags)
1225{
1226	struct in6_multi *in6m_sol;
1227	int error = 0;
1228
1229	/* Add local address to lltable, if necessary (ex. on p2p link). */
1230	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1231		in6_purgeaddr(&ia->ia_ifa);
1232		ifa_free(&ia->ia_ifa);
1233		return (error);
1234	}
1235
1236	/* Join necessary multicast groups. */
1237	in6m_sol = NULL;
1238	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1239		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1240		if (error != 0) {
1241			in6_purgeaddr(&ia->ia_ifa);
1242			ifa_free(&ia->ia_ifa);
1243			return (error);
1244		}
1245	}
1246
1247	/* Perform DAD, if the address is TENTATIVE. */
1248	if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1249		int delay, mindelay, maxdelay;
1250
1251		delay = 0;
1252		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1253			/*
1254			 * We need to impose a delay before sending an NS
1255			 * for DAD.  Check if we also needed a delay for the
1256			 * corresponding MLD message.  If we did, the delay
1257			 * should be larger than the MLD delay (this could be
1258			 * relaxed a bit, but this simple logic is at least
1259			 * safe).
1260			 * XXX: Break data hiding guidelines and look at
1261			 * state for the solicited multicast group.
1262			 */
1263			mindelay = 0;
1264			if (in6m_sol != NULL &&
1265			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1266				mindelay = in6m_sol->in6m_timer;
1267			}
1268			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1269			if (maxdelay - mindelay == 0)
1270				delay = 0;
1271			else {
1272				delay =
1273				    (arc4random() % (maxdelay - mindelay)) +
1274				    mindelay;
1275			}
1276		}
1277		nd6_dad_start((struct ifaddr *)ia, delay);
1278	}
1279
1280	in6_newaddrmsg(ia, RTM_ADD);
1281	ifa_free(&ia->ia_ifa);
1282	return (error);
1283}
1284
1285void
1286in6_purgeaddr(struct ifaddr *ifa)
1287{
1288	struct ifnet *ifp = ifa->ifa_ifp;
1289	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1290	struct in6_multi_mship *imm;
1291	int plen, error;
1292
1293	if (ifa->ifa_carp)
1294		(*carp_detach_p)(ifa);
1295
1296	/*
1297	 * Remove the loopback route to the interface address.
1298	 * The check for the current setting of "nd6_useloopback"
1299	 * is not needed.
1300	 */
1301	if (ia->ia_flags & IFA_RTSELF) {
1302		error = ifa_del_loopback_route((struct ifaddr *)ia,
1303		    (struct sockaddr *)&ia->ia_addr);
1304		if (error == 0)
1305			ia->ia_flags &= ~IFA_RTSELF;
1306	}
1307
1308	/* stop DAD processing */
1309	nd6_dad_stop(ifa);
1310
1311	/* Leave multicast groups. */
1312	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1313		LIST_REMOVE(imm, i6mm_chain);
1314		in6_leavegroup(imm);
1315	}
1316	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1317	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1318		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1319		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1320		if (error != 0)
1321			log(LOG_INFO, "%s: err=%d, destination address delete "
1322			    "failed\n", __func__, error);
1323		ia->ia_flags &= ~IFA_ROUTE;
1324	}
1325
1326	in6_newaddrmsg(ia, RTM_DELETE);
1327	in6_unlink_ifa(ia, ifp);
1328}
1329
1330static void
1331in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1332{
1333	char ip6buf[INET6_ADDRSTRLEN];
1334	int remove_lle;
1335
1336	IF_ADDR_WLOCK(ifp);
1337	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1338	IF_ADDR_WUNLOCK(ifp);
1339	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1340
1341	/*
1342	 * Defer the release of what might be the last reference to the
1343	 * in6_ifaddr so that it can't be freed before the remainder of the
1344	 * cleanup.
1345	 */
1346	IN6_IFADDR_WLOCK();
1347	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1348	LIST_REMOVE(ia, ia6_hash);
1349	IN6_IFADDR_WUNLOCK();
1350
1351	/*
1352	 * Release the reference to the base prefix.  There should be a
1353	 * positive reference.
1354	 */
1355	remove_lle = 0;
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		/* Do not delete lles within prefix if refcont != 0 */
1363		if (ia->ia6_ndpr->ndpr_refcnt == 0)
1364			remove_lle = 1;
1365		ia->ia6_ndpr = NULL;
1366	}
1367
1368	nd6_rem_ifa_lle(ia, remove_lle);
1369
1370	/*
1371	 * Also, if the address being removed is autoconf'ed, call
1372	 * pfxlist_onlink_check() since the release might affect the status of
1373	 * other (detached) addresses.
1374	 */
1375	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1376		pfxlist_onlink_check();
1377	}
1378	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1379}
1380
1381/*
1382 * Notifies other subsystems about address change/arrival:
1383 * 1) Notifies device handler on the first IPv6 address assignment
1384 * 2) Handle routing table changes for P2P links and route
1385 * 3) Handle routing table changes for address host route
1386 */
1387static int
1388in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1389    struct in6_aliasreq *ifra, int hostIsNew)
1390{
1391	int	error = 0, plen, ifacount = 0;
1392	struct ifaddr *ifa;
1393	struct sockaddr_in6 *pdst;
1394	char ip6buf[INET6_ADDRSTRLEN];
1395
1396	/*
1397	 * Give the interface a chance to initialize
1398	 * if this is its first address,
1399	 */
1400	if (hostIsNew != 0) {
1401		IF_ADDR_RLOCK(ifp);
1402		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1403			if (ifa->ifa_addr->sa_family != AF_INET6)
1404				continue;
1405			ifacount++;
1406		}
1407		IF_ADDR_RUNLOCK(ifp);
1408	}
1409
1410	if (ifacount <= 1 && ifp->if_ioctl) {
1411		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1412		if (error)
1413			return (error);
1414	}
1415
1416	/*
1417	 * If a new destination address is specified, scrub the old one and
1418	 * install the new destination.  Note that the interface must be
1419	 * p2p or loopback.
1420	 */
1421	pdst = &ifra->ifra_dstaddr;
1422	if (pdst->sin6_family == AF_INET6 &&
1423	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1424		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1425		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1426			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1427			    "remove a route to the old destination: %s\n",
1428			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1429			/* proceed anyway... */
1430		} else
1431			ia->ia_flags &= ~IFA_ROUTE;
1432		ia->ia_dstaddr = *pdst;
1433	}
1434
1435	/*
1436	 * If a new destination address is specified for a point-to-point
1437	 * interface, install a route to the destination as an interface
1438	 * direct route.
1439	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1440	 * interface that share the same destination.
1441	 */
1442	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1443	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1444	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1445		int rtflags = RTF_UP | RTF_HOST;
1446		/*
1447		 * Handle the case for ::1 .
1448		 */
1449		if (ifp->if_flags & IFF_LOOPBACK)
1450			ia->ia_flags |= IFA_RTSELF;
1451		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1452		if (error)
1453			return (error);
1454		ia->ia_flags |= IFA_ROUTE;
1455	}
1456
1457	/*
1458	 * add a loopback route to self if not exists
1459	 */
1460	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1461		error = ifa_add_loopback_route((struct ifaddr *)ia,
1462		    (struct sockaddr *)&ia->ia_addr);
1463		if (error == 0)
1464			ia->ia_flags |= IFA_RTSELF;
1465	}
1466
1467	return (error);
1468}
1469
1470/*
1471 * Find an IPv6 interface link-local address specific to an interface.
1472 * ifaddr is returned referenced.
1473 */
1474struct in6_ifaddr *
1475in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1476{
1477	struct ifaddr *ifa;
1478
1479	IF_ADDR_RLOCK(ifp);
1480	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1481		if (ifa->ifa_addr->sa_family != AF_INET6)
1482			continue;
1483		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1484			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1485			    ignoreflags) != 0)
1486				continue;
1487			ifa_ref(ifa);
1488			break;
1489		}
1490	}
1491	IF_ADDR_RUNLOCK(ifp);
1492
1493	return ((struct in6_ifaddr *)ifa);
1494}
1495
1496
1497/*
1498 * find the internet address corresponding to a given address.
1499 * ifaddr is returned referenced.
1500 */
1501struct in6_ifaddr *
1502in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1503{
1504	struct rm_priotracker in6_ifa_tracker;
1505	struct in6_ifaddr *ia;
1506
1507	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1508	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1509		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1510			if (zoneid != 0 &&
1511			    zoneid != ia->ia_addr.sin6_scope_id)
1512				continue;
1513			ifa_ref(&ia->ia_ifa);
1514			break;
1515		}
1516	}
1517	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1518	return (ia);
1519}
1520
1521/*
1522 * find the internet address corresponding to a given interface and address.
1523 * ifaddr is returned referenced.
1524 */
1525struct in6_ifaddr *
1526in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1527{
1528	struct ifaddr *ifa;
1529
1530	IF_ADDR_RLOCK(ifp);
1531	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1532		if (ifa->ifa_addr->sa_family != AF_INET6)
1533			continue;
1534		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1535			ifa_ref(ifa);
1536			break;
1537		}
1538	}
1539	IF_ADDR_RUNLOCK(ifp);
1540
1541	return ((struct in6_ifaddr *)ifa);
1542}
1543
1544/*
1545 * Find a link-local scoped address on ifp and return it if any.
1546 */
1547struct in6_ifaddr *
1548in6ifa_llaonifp(struct ifnet *ifp)
1549{
1550	struct sockaddr_in6 *sin6;
1551	struct ifaddr *ifa;
1552
1553	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1554		return (NULL);
1555	if_addr_rlock(ifp);
1556	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1557		if (ifa->ifa_addr->sa_family != AF_INET6)
1558			continue;
1559		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1560		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1561		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1562		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1563			break;
1564	}
1565	if_addr_runlock(ifp);
1566
1567	return ((struct in6_ifaddr *)ifa);
1568}
1569
1570/*
1571 * Convert IP6 address to printable (loggable) representation. Caller
1572 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1573 */
1574static char digits[] = "0123456789abcdef";
1575char *
1576ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1577{
1578	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1579	char *cp;
1580	const u_int16_t *a = (const u_int16_t *)addr;
1581	const u_int8_t *d;
1582	int dcolon = 0, zero = 0;
1583
1584	cp = ip6buf;
1585
1586	for (i = 0; i < 8; i++) {
1587		if (*(a + i) == 0) {
1588			cnt++;
1589			if (cnt == 1)
1590				idx = i;
1591		}
1592		else if (maxcnt < cnt) {
1593			maxcnt = cnt;
1594			index = idx;
1595			cnt = 0;
1596		}
1597	}
1598	if (maxcnt < cnt) {
1599		maxcnt = cnt;
1600		index = idx;
1601	}
1602
1603	for (i = 0; i < 8; i++) {
1604		if (dcolon == 1) {
1605			if (*a == 0) {
1606				if (i == 7)
1607					*cp++ = ':';
1608				a++;
1609				continue;
1610			} else
1611				dcolon = 2;
1612		}
1613		if (*a == 0) {
1614			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1615				if (i == 0)
1616					*cp++ = ':';
1617				*cp++ = ':';
1618				dcolon = 1;
1619			} else {
1620				*cp++ = '0';
1621				*cp++ = ':';
1622			}
1623			a++;
1624			continue;
1625		}
1626		d = (const u_char *)a;
1627		/* Try to eliminate leading zeros in printout like in :0001. */
1628		zero = 1;
1629		*cp = digits[*d >> 4];
1630		if (*cp != '0') {
1631			zero = 0;
1632			cp++;
1633		}
1634		*cp = digits[*d++ & 0xf];
1635		if (zero == 0 || (*cp != '0')) {
1636			zero = 0;
1637			cp++;
1638		}
1639		*cp = digits[*d >> 4];
1640		if (zero == 0 || (*cp != '0')) {
1641			zero = 0;
1642			cp++;
1643		}
1644		*cp++ = digits[*d & 0xf];
1645		*cp++ = ':';
1646		a++;
1647	}
1648	*--cp = '\0';
1649	return (ip6buf);
1650}
1651
1652int
1653in6_localaddr(struct in6_addr *in6)
1654{
1655	struct rm_priotracker in6_ifa_tracker;
1656	struct in6_ifaddr *ia;
1657
1658	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1659		return 1;
1660
1661	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1662	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1663		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1664		    &ia->ia_prefixmask.sin6_addr)) {
1665			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1666			return 1;
1667		}
1668	}
1669	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1670
1671	return (0);
1672}
1673
1674/*
1675 * Return 1 if an internet address is for the local host and configured
1676 * on one of its interfaces.
1677 */
1678int
1679in6_localip(struct in6_addr *in6)
1680{
1681	struct rm_priotracker in6_ifa_tracker;
1682	struct in6_ifaddr *ia;
1683
1684	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1685	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1686		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1687			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1688			return (1);
1689		}
1690	}
1691	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1692	return (0);
1693}
1694
1695/*
1696 * Return 1 if an internet address is configured on an interface.
1697 */
1698int
1699in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1700{
1701	struct in6_addr in6;
1702	struct ifaddr *ifa;
1703	struct in6_ifaddr *ia6;
1704
1705	in6 = *addr;
1706	if (in6_clearscope(&in6))
1707		return (0);
1708	in6_setscope(&in6, ifp, NULL);
1709
1710	IF_ADDR_RLOCK(ifp);
1711	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1712		if (ifa->ifa_addr->sa_family != AF_INET6)
1713			continue;
1714		ia6 = (struct in6_ifaddr *)ifa;
1715		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1716			IF_ADDR_RUNLOCK(ifp);
1717			return (1);
1718		}
1719	}
1720	IF_ADDR_RUNLOCK(ifp);
1721
1722	return (0);
1723}
1724
1725int
1726in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1727{
1728	struct rm_priotracker in6_ifa_tracker;
1729	struct in6_ifaddr *ia;
1730
1731	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1732	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1733		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1734			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1735				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1736				return (1); /* true */
1737			}
1738			break;
1739		}
1740	}
1741	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1742
1743	return (0);		/* false */
1744}
1745
1746/*
1747 * return length of part which dst and src are equal
1748 * hard coding...
1749 */
1750int
1751in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1752{
1753	int match = 0;
1754	u_char *s = (u_char *)src, *d = (u_char *)dst;
1755	u_char *lim = s + 16, r;
1756
1757	while (s < lim)
1758		if ((r = (*d++ ^ *s++)) != 0) {
1759			while (r < 128) {
1760				match++;
1761				r <<= 1;
1762			}
1763			break;
1764		} else
1765			match += 8;
1766	return match;
1767}
1768
1769/* XXX: to be scope conscious */
1770int
1771in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1772{
1773	int bytelen, bitlen;
1774
1775	/* sanity check */
1776	if (0 > len || len > 128) {
1777		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1778		    len);
1779		return (0);
1780	}
1781
1782	bytelen = len / 8;
1783	bitlen = len % 8;
1784
1785	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1786		return (0);
1787	if (bitlen != 0 &&
1788	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1789	    p2->s6_addr[bytelen] >> (8 - bitlen))
1790		return (0);
1791
1792	return (1);
1793}
1794
1795void
1796in6_prefixlen2mask(struct in6_addr *maskp, int len)
1797{
1798	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1799	int bytelen, bitlen, i;
1800
1801	/* sanity check */
1802	if (0 > len || len > 128) {
1803		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1804		    len);
1805		return;
1806	}
1807
1808	bzero(maskp, sizeof(*maskp));
1809	bytelen = len / 8;
1810	bitlen = len % 8;
1811	for (i = 0; i < bytelen; i++)
1812		maskp->s6_addr[i] = 0xff;
1813	if (bitlen)
1814		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1815}
1816
1817/*
1818 * return the best address out of the same scope. if no address was
1819 * found, return the first valid address from designated IF.
1820 */
1821struct in6_ifaddr *
1822in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1823{
1824	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1825	struct ifaddr *ifa;
1826	struct in6_ifaddr *besta = 0;
1827	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1828
1829	dep[0] = dep[1] = NULL;
1830
1831	/*
1832	 * We first look for addresses in the same scope.
1833	 * If there is one, return it.
1834	 * If two or more, return one which matches the dst longest.
1835	 * If none, return one of global addresses assigned other ifs.
1836	 */
1837	IF_ADDR_RLOCK(ifp);
1838	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1839		if (ifa->ifa_addr->sa_family != AF_INET6)
1840			continue;
1841		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1842			continue; /* XXX: is there any case to allow anycast? */
1843		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1844			continue; /* don't use this interface */
1845		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1846			continue;
1847		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1848			if (V_ip6_use_deprecated)
1849				dep[0] = (struct in6_ifaddr *)ifa;
1850			continue;
1851		}
1852
1853		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1854			/*
1855			 * call in6_matchlen() as few as possible
1856			 */
1857			if (besta) {
1858				if (blen == -1)
1859					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1860				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1861				if (tlen > blen) {
1862					blen = tlen;
1863					besta = (struct in6_ifaddr *)ifa;
1864				}
1865			} else
1866				besta = (struct in6_ifaddr *)ifa;
1867		}
1868	}
1869	if (besta) {
1870		ifa_ref(&besta->ia_ifa);
1871		IF_ADDR_RUNLOCK(ifp);
1872		return (besta);
1873	}
1874
1875	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1876		if (ifa->ifa_addr->sa_family != AF_INET6)
1877			continue;
1878		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1879			continue; /* XXX: is there any case to allow anycast? */
1880		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1881			continue; /* don't use this interface */
1882		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1883			continue;
1884		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1885			if (V_ip6_use_deprecated)
1886				dep[1] = (struct in6_ifaddr *)ifa;
1887			continue;
1888		}
1889
1890		if (ifa != NULL)
1891			ifa_ref(ifa);
1892		IF_ADDR_RUNLOCK(ifp);
1893		return (struct in6_ifaddr *)ifa;
1894	}
1895
1896	/* use the last-resort values, that are, deprecated addresses */
1897	if (dep[0]) {
1898		ifa_ref((struct ifaddr *)dep[0]);
1899		IF_ADDR_RUNLOCK(ifp);
1900		return dep[0];
1901	}
1902	if (dep[1]) {
1903		ifa_ref((struct ifaddr *)dep[1]);
1904		IF_ADDR_RUNLOCK(ifp);
1905		return dep[1];
1906	}
1907
1908	IF_ADDR_RUNLOCK(ifp);
1909	return NULL;
1910}
1911
1912/*
1913 * perform DAD when interface becomes IFF_UP.
1914 */
1915void
1916in6_if_up(struct ifnet *ifp)
1917{
1918	struct ifaddr *ifa;
1919	struct in6_ifaddr *ia;
1920
1921	IF_ADDR_RLOCK(ifp);
1922	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1923		if (ifa->ifa_addr->sa_family != AF_INET6)
1924			continue;
1925		ia = (struct in6_ifaddr *)ifa;
1926		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1927			/*
1928			 * The TENTATIVE flag was likely set by hand
1929			 * beforehand, implicitly indicating the need for DAD.
1930			 * We may be able to skip the random delay in this
1931			 * case, but we impose delays just in case.
1932			 */
1933			nd6_dad_start(ifa,
1934			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1935		}
1936	}
1937	IF_ADDR_RUNLOCK(ifp);
1938
1939	/*
1940	 * special cases, like 6to4, are handled in in6_ifattach
1941	 */
1942	in6_ifattach(ifp, NULL);
1943}
1944
1945int
1946in6if_do_dad(struct ifnet *ifp)
1947{
1948	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1949		return (0);
1950
1951	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1952	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1953		return (0);
1954
1955	/*
1956	 * Our DAD routine requires the interface up and running.
1957	 * However, some interfaces can be up before the RUNNING
1958	 * status.  Additionaly, users may try to assign addresses
1959	 * before the interface becomes up (or running).
1960	 * This function returns EAGAIN in that case.
1961	 * The caller should mark "tentative" on the address instead of
1962	 * performing DAD immediately.
1963	 */
1964	if (!((ifp->if_flags & IFF_UP) &&
1965	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1966		return (EAGAIN);
1967
1968	return (1);
1969}
1970
1971/*
1972 * Calculate max IPv6 MTU through all the interfaces and store it
1973 * to in6_maxmtu.
1974 */
1975void
1976in6_setmaxmtu(void)
1977{
1978	unsigned long maxmtu = 0;
1979	struct ifnet *ifp;
1980
1981	IFNET_RLOCK_NOSLEEP();
1982	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1983		/* this function can be called during ifnet initialization */
1984		if (!ifp->if_afdata[AF_INET6])
1985			continue;
1986		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1987		    IN6_LINKMTU(ifp) > maxmtu)
1988			maxmtu = IN6_LINKMTU(ifp);
1989	}
1990	IFNET_RUNLOCK_NOSLEEP();
1991	if (maxmtu)	/* update only when maxmtu is positive */
1992		V_in6_maxmtu = maxmtu;
1993}
1994
1995/*
1996 * Provide the length of interface identifiers to be used for the link attached
1997 * to the given interface.  The length should be defined in "IPv6 over
1998 * xxx-link" document.  Note that address architecture might also define
1999 * the length for a particular set of address prefixes, regardless of the
2000 * link type.  As clarified in rfc2462bis, those two definitions should be
2001 * consistent, and those really are as of August 2004.
2002 */
2003int
2004in6_if2idlen(struct ifnet *ifp)
2005{
2006	switch (ifp->if_type) {
2007	case IFT_ETHER:		/* RFC2464 */
2008	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2009	case IFT_L2VLAN:	/* ditto */
2010	case IFT_IEEE80211:	/* ditto */
2011	case IFT_BRIDGE:	/* bridge(4) only does Ethernet-like links */
2012	case IFT_INFINIBAND:
2013		return (64);
2014	case IFT_FDDI:		/* RFC2467 */
2015		return (64);
2016	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2017		return (64);
2018	case IFT_PPP:		/* RFC2472 */
2019		return (64);
2020	case IFT_ARCNET:	/* RFC2497 */
2021		return (64);
2022	case IFT_FRELAY:	/* RFC2590 */
2023		return (64);
2024	case IFT_IEEE1394:	/* RFC3146 */
2025		return (64);
2026	case IFT_GIF:
2027		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2028	case IFT_LOOP:
2029		return (64);	/* XXX: is this really correct? */
2030	default:
2031		/*
2032		 * Unknown link type:
2033		 * It might be controversial to use the today's common constant
2034		 * of 64 for these cases unconditionally.  For full compliance,
2035		 * we should return an error in this case.  On the other hand,
2036		 * if we simply miss the standard for the link type or a new
2037		 * standard is defined for a new link type, the IFID length
2038		 * is very likely to be the common constant.  As a compromise,
2039		 * we always use the constant, but make an explicit notice
2040		 * indicating the "unknown" case.
2041		 */
2042		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2043		return (64);
2044	}
2045}
2046
2047#include <sys/sysctl.h>
2048
2049struct in6_llentry {
2050	struct llentry		base;
2051};
2052
2053#define	IN6_LLTBL_DEFAULT_HSIZE	32
2054#define	IN6_LLTBL_HASH(k, h) \
2055	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2056
2057/*
2058 * Do actual deallocation of @lle.
2059 * Called by LLE_FREE_LOCKED when number of references
2060 * drops to zero.
2061 */
2062static void
2063in6_lltable_destroy_lle(struct llentry *lle)
2064{
2065
2066	LLE_WUNLOCK(lle);
2067	LLE_LOCK_DESTROY(lle);
2068	LLE_REQ_DESTROY(lle);
2069	free(lle, M_LLTABLE);
2070}
2071
2072static struct llentry *
2073in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2074{
2075	struct in6_llentry *lle;
2076
2077	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2078	if (lle == NULL)		/* NB: caller generates msg */
2079		return NULL;
2080
2081	lle->base.r_l3addr.addr6 = *addr6;
2082	lle->base.lle_refcnt = 1;
2083	lle->base.lle_free = in6_lltable_destroy_lle;
2084	LLE_LOCK_INIT(&lle->base);
2085	LLE_REQ_INIT(&lle->base);
2086	callout_init(&lle->base.lle_timer, 1);
2087
2088	return (&lle->base);
2089}
2090
2091static int
2092in6_lltable_match_prefix(const struct sockaddr *saddr,
2093    const struct sockaddr *smask, u_int flags, struct llentry *lle)
2094{
2095	const struct in6_addr *addr, *mask, *lle_addr;
2096
2097	addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2098	mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2099	lle_addr = &lle->r_l3addr.addr6;
2100
2101	if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2102		return (0);
2103
2104	if (lle->la_flags & LLE_IFADDR) {
2105
2106		/*
2107		 * Delete LLE_IFADDR records IFF address & flag matches.
2108		 * Note that addr is the interface address within prefix
2109		 * being matched.
2110		 */
2111		if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2112		    (flags & LLE_STATIC) != 0)
2113			return (1);
2114		return (0);
2115	}
2116
2117	/* flags & LLE_STATIC means deleting both dynamic and static entries */
2118	if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2119		return (1);
2120
2121	return (0);
2122}
2123
2124static void
2125in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2126{
2127	struct ifnet *ifp;
2128
2129	LLE_WLOCK_ASSERT(lle);
2130	KASSERT(llt != NULL, ("lltable is NULL"));
2131
2132	/* Unlink entry from table */
2133	if ((lle->la_flags & LLE_LINKED) != 0) {
2134
2135		ifp = llt->llt_ifp;
2136		IF_AFDATA_WLOCK_ASSERT(ifp);
2137		lltable_unlink_entry(llt, lle);
2138	}
2139
2140	if (callout_stop(&lle->lle_timer) > 0)
2141		LLE_REMREF(lle);
2142
2143	llentry_free(lle);
2144}
2145
2146static int
2147in6_lltable_rtcheck(struct ifnet *ifp,
2148		    u_int flags,
2149		    const struct sockaddr *l3addr)
2150{
2151	const struct sockaddr_in6 *sin6;
2152	struct nhop6_basic nh6;
2153	struct in6_addr dst;
2154	uint32_t scopeid;
2155	int error;
2156	char ip6buf[INET6_ADDRSTRLEN];
2157
2158	KASSERT(l3addr->sa_family == AF_INET6,
2159	    ("sin_family %d", l3addr->sa_family));
2160
2161	/* Our local addresses are always only installed on the default FIB. */
2162
2163	sin6 = (const struct sockaddr_in6 *)l3addr;
2164	in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2165	error = fib6_lookup_nh_basic(RT_DEFAULT_FIB, &dst, scopeid, 0, 0, &nh6);
2166	if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
2167		struct ifaddr *ifa;
2168		/*
2169		 * Create an ND6 cache for an IPv6 neighbor
2170		 * that is not covered by our own prefix.
2171		 */
2172		ifa = ifaof_ifpforaddr(l3addr, ifp);
2173		if (ifa != NULL) {
2174			ifa_free(ifa);
2175			return 0;
2176		}
2177		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2178		    ip6_sprintf(ip6buf, &sin6->sin6_addr));
2179		return EINVAL;
2180	}
2181	return 0;
2182}
2183
2184static inline uint32_t
2185in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2186{
2187
2188	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2189}
2190
2191static uint32_t
2192in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2193{
2194
2195	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2196}
2197
2198static void
2199in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2200{
2201	struct sockaddr_in6 *sin6;
2202
2203	sin6 = (struct sockaddr_in6 *)sa;
2204	bzero(sin6, sizeof(*sin6));
2205	sin6->sin6_family = AF_INET6;
2206	sin6->sin6_len = sizeof(*sin6);
2207	sin6->sin6_addr = lle->r_l3addr.addr6;
2208}
2209
2210static inline struct llentry *
2211in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2212{
2213	struct llentry *lle;
2214	struct llentries *lleh;
2215	u_int hashidx;
2216
2217	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2218	lleh = &llt->lle_head[hashidx];
2219	LIST_FOREACH(lle, lleh, lle_next) {
2220		if (lle->la_flags & LLE_DELETED)
2221			continue;
2222		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2223			break;
2224	}
2225
2226	return (lle);
2227}
2228
2229static void
2230in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2231{
2232
2233	lle->la_flags |= LLE_DELETED;
2234	EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2235#ifdef DIAGNOSTIC
2236	log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2237#endif
2238	llentry_free(lle);
2239}
2240
2241static struct llentry *
2242in6_lltable_alloc(struct lltable *llt, u_int flags,
2243	const struct sockaddr *l3addr)
2244{
2245	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2246	struct ifnet *ifp = llt->llt_ifp;
2247	struct llentry *lle;
2248
2249	KASSERT(l3addr->sa_family == AF_INET6,
2250	    ("sin_family %d", l3addr->sa_family));
2251
2252	/*
2253	 * A route that covers the given address must have
2254	 * been installed 1st because we are doing a resolution,
2255	 * verify this.
2256	 */
2257	if (!(flags & LLE_IFADDR) &&
2258	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2259		return (NULL);
2260
2261	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2262	if (lle == NULL) {
2263		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2264		return (NULL);
2265	}
2266	lle->la_flags = flags;
2267	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2268		lltable_set_entry_addr(ifp, lle, IF_LLADDR(ifp));
2269		lle->la_flags |= LLE_STATIC;
2270	}
2271
2272	if ((lle->la_flags & LLE_STATIC) != 0)
2273		lle->ln_state = ND6_LLINFO_REACHABLE;
2274
2275	return (lle);
2276}
2277
2278static struct llentry *
2279in6_lltable_lookup(struct lltable *llt, u_int flags,
2280	const struct sockaddr *l3addr)
2281{
2282	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2283	struct llentry *lle;
2284
2285	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2286	KASSERT(l3addr->sa_family == AF_INET6,
2287	    ("sin_family %d", l3addr->sa_family));
2288
2289	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2290
2291	if (lle == NULL)
2292		return (NULL);
2293
2294	KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
2295	    (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
2296	    flags));
2297
2298	if (flags & LLE_UNLOCKED)
2299		return (lle);
2300
2301	if (flags & LLE_EXCLUSIVE)
2302		LLE_WLOCK(lle);
2303	else
2304		LLE_RLOCK(lle);
2305	return (lle);
2306}
2307
2308static int
2309in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2310    struct sysctl_req *wr)
2311{
2312	struct ifnet *ifp = llt->llt_ifp;
2313	/* XXX stack use */
2314	struct {
2315		struct rt_msghdr	rtm;
2316		struct sockaddr_in6	sin6;
2317		/*
2318		 * ndp.c assumes that sdl is word aligned
2319		 */
2320#ifdef __LP64__
2321		uint32_t		pad;
2322#endif
2323		struct sockaddr_dl	sdl;
2324	} ndpc;
2325	struct sockaddr_dl *sdl;
2326	int error;
2327
2328	bzero(&ndpc, sizeof(ndpc));
2329			/* skip deleted entries */
2330			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2331				return (0);
2332			/* Skip if jailed and not a valid IP of the prison. */
2333			lltable_fill_sa_entry(lle,
2334			    (struct sockaddr *)&ndpc.sin6);
2335			if (prison_if(wr->td->td_ucred,
2336			    (struct sockaddr *)&ndpc.sin6) != 0)
2337				return (0);
2338			/*
2339			 * produce a msg made of:
2340			 *  struct rt_msghdr;
2341			 *  struct sockaddr_in6 (IPv6)
2342			 *  struct sockaddr_dl;
2343			 */
2344			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2345			ndpc.rtm.rtm_version = RTM_VERSION;
2346			ndpc.rtm.rtm_type = RTM_GET;
2347			ndpc.rtm.rtm_flags = RTF_UP;
2348			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2349			if (V_deembed_scopeid)
2350				sa6_recoverscope(&ndpc.sin6);
2351
2352			/* publish */
2353			if (lle->la_flags & LLE_PUB)
2354				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2355
2356			sdl = &ndpc.sdl;
2357			sdl->sdl_family = AF_LINK;
2358			sdl->sdl_len = sizeof(*sdl);
2359			sdl->sdl_alen = ifp->if_addrlen;
2360			sdl->sdl_index = ifp->if_index;
2361			sdl->sdl_type = ifp->if_type;
2362			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2363			if (lle->la_expire != 0)
2364				ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2365				    lle->lle_remtime / hz +
2366				    time_second - time_uptime;
2367			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2368			if (lle->la_flags & LLE_STATIC)
2369				ndpc.rtm.rtm_flags |= RTF_STATIC;
2370			if (lle->la_flags & LLE_IFADDR)
2371				ndpc.rtm.rtm_flags |= RTF_PINNED;
2372			if (lle->ln_router != 0)
2373				ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2374			ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2375			/* Store state in rmx_weight value */
2376			ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2377			ndpc.rtm.rtm_index = ifp->if_index;
2378			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2379
2380	return (error);
2381}
2382
2383static struct lltable *
2384in6_lltattach(struct ifnet *ifp)
2385{
2386	struct lltable *llt;
2387
2388	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2389	llt->llt_af = AF_INET6;
2390	llt->llt_ifp = ifp;
2391
2392	llt->llt_lookup = in6_lltable_lookup;
2393	llt->llt_alloc_entry = in6_lltable_alloc;
2394	llt->llt_delete_entry = in6_lltable_delete_entry;
2395	llt->llt_dump_entry = in6_lltable_dump_entry;
2396	llt->llt_hash = in6_lltable_hash;
2397	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2398	llt->llt_free_entry = in6_lltable_free_entry;
2399	llt->llt_match_prefix = in6_lltable_match_prefix;
2400 	lltable_link(llt);
2401
2402	return (llt);
2403}
2404
2405void *
2406in6_domifattach(struct ifnet *ifp)
2407{
2408	struct in6_ifextra *ext;
2409
2410	/* There are not IPv6-capable interfaces. */
2411	switch (ifp->if_type) {
2412	case IFT_PFLOG:
2413	case IFT_PFSYNC:
2414	case IFT_USB:
2415		return (NULL);
2416	}
2417	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2418	bzero(ext, sizeof(*ext));
2419
2420	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2421	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2422	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2423	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2424
2425	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2426	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2427	    M_WAITOK);
2428	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2429	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2430
2431	ext->nd_ifinfo = nd6_ifattach(ifp);
2432	ext->scope6_id = scope6_ifattach(ifp);
2433	ext->lltable = in6_lltattach(ifp);
2434
2435	ext->mld_ifinfo = mld_domifattach(ifp);
2436
2437	return ext;
2438}
2439
2440int
2441in6_domifmtu(struct ifnet *ifp)
2442{
2443	if (ifp->if_afdata[AF_INET6] == NULL)
2444		return ifp->if_mtu;
2445
2446	return (IN6_LINKMTU(ifp));
2447}
2448
2449void
2450in6_domifdetach(struct ifnet *ifp, void *aux)
2451{
2452	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2453
2454	mld_domifdetach(ifp);
2455	scope6_ifdetach(ext->scope6_id);
2456	nd6_ifdetach(ext->nd_ifinfo);
2457	lltable_free(ext->lltable);
2458	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2459	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2460	free(ext->in6_ifstat, M_IFADDR);
2461	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2462	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2463	free(ext->icmp6_ifstat, M_IFADDR);
2464	free(ext, M_IFADDR);
2465}
2466
2467/*
2468 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2469 * v4 mapped addr or v4 compat addr
2470 */
2471void
2472in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2473{
2474
2475	bzero(sin, sizeof(*sin));
2476	sin->sin_len = sizeof(struct sockaddr_in);
2477	sin->sin_family = AF_INET;
2478	sin->sin_port = sin6->sin6_port;
2479	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2480}
2481
2482/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2483void
2484in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2485{
2486	bzero(sin6, sizeof(*sin6));
2487	sin6->sin6_len = sizeof(struct sockaddr_in6);
2488	sin6->sin6_family = AF_INET6;
2489	sin6->sin6_port = sin->sin_port;
2490	sin6->sin6_addr.s6_addr32[0] = 0;
2491	sin6->sin6_addr.s6_addr32[1] = 0;
2492	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2493	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2494}
2495
2496/* Convert sockaddr_in6 into sockaddr_in. */
2497void
2498in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2499{
2500	struct sockaddr_in *sin_p;
2501	struct sockaddr_in6 sin6;
2502
2503	/*
2504	 * Save original sockaddr_in6 addr and convert it
2505	 * to sockaddr_in.
2506	 */
2507	sin6 = *(struct sockaddr_in6 *)nam;
2508	sin_p = (struct sockaddr_in *)nam;
2509	in6_sin6_2_sin(sin_p, &sin6);
2510}
2511
2512/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2513void
2514in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2515{
2516	struct sockaddr_in *sin_p;
2517	struct sockaddr_in6 *sin6_p;
2518
2519	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2520	sin_p = (struct sockaddr_in *)*nam;
2521	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2522	free(*nam, M_SONAME);
2523	*nam = (struct sockaddr *)sin6_p;
2524}
2525