in6.c revision 3e1524c83e71a2bca2e8caa4e42e8054d09cd16d
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
112VNET_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 */
118const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
119const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
120const struct in6_addr in6addr_nodelocal_allnodes =
121	IN6ADDR_NODELOCAL_ALLNODES_INIT;
122const struct in6_addr in6addr_linklocal_allnodes =
123	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
124const struct in6_addr in6addr_linklocal_allrouters =
125	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
126const struct in6_addr in6addr_linklocal_allv2routers =
127	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
128
129const struct in6_addr in6mask0 = IN6MASK0;
130const struct in6_addr in6mask32 = IN6MASK32;
131const struct in6_addr in6mask64 = IN6MASK64;
132const struct in6_addr in6mask96 = IN6MASK96;
133const struct in6_addr in6mask128 = IN6MASK128;
134
135const struct sockaddr_in6 sa6_any =
136	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
137
138static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
139	struct in6_aliasreq *, int);
140static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
141
142static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
143    struct in6_ifaddr *, int);
144static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
145    struct in6_aliasreq *, int flags);
146static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
147    struct in6_ifaddr *, int, int);
148static 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
155void
156in6_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
182int
183in6_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
219struct in6_ndifreq32 {
220	char ifname[IFNAMSIZ];
221	uint32_t ifindex;
222};
223#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
224#endif
225
226int
227in6_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 SIOCGDRLST_IN6:
285	case SIOCGPRLST_IN6:
286	case SIOCGNBRINFO_IN6:
287	case SIOCGDEFIFACE_IN6:
288		return (nd6_ioctl(cmd, data, ifp));
289
290#ifdef COMPAT_FREEBSD32
291	case SIOCGDEFIFACE32_IN6:
292		{
293			struct in6_ndifreq ndif;
294			struct in6_ndifreq32 *ndif32;
295
296			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
297			    ifp);
298			if (error)
299				return (error);
300			ndif32 = (struct in6_ndifreq32 *)data;
301			ndif32->ifindex = ndif.ifindex;
302			return (0);
303		}
304#endif
305	}
306
307	switch (cmd) {
308	case SIOCSIFPREFIX_IN6:
309	case SIOCDIFPREFIX_IN6:
310	case SIOCAIFPREFIX_IN6:
311	case SIOCCIFPREFIX_IN6:
312	case SIOCSGIFPREFIX_IN6:
313	case SIOCGIFPREFIX_IN6:
314		log(LOG_NOTICE,
315		    "prefix ioctls are now invalidated. "
316		    "please use ifconfig.\n");
317		return (EOPNOTSUPP);
318	}
319
320	switch (cmd) {
321	case SIOCSSCOPE6:
322		if (td != NULL) {
323			error = priv_check(td, PRIV_NETINET_SCOPE6);
324			if (error)
325				return (error);
326		}
327		/* FALLTHROUGH */
328	case SIOCGSCOPE6:
329	case SIOCGSCOPE6DEF:
330		return (scope6_ioctl(cmd, data, ifp));
331	}
332
333	/*
334	 * Find address for this interface, if it exists.
335	 *
336	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
337	 * only, and used the first interface address as the target of other
338	 * operations (without checking ifra_addr).  This was because netinet
339	 * code/API assumed at most 1 interface address per interface.
340	 * Since IPv6 allows a node to assign multiple addresses
341	 * on a single interface, we almost always look and check the
342	 * presence of ifra_addr, and reject invalid ones here.
343	 * It also decreases duplicated code among SIOC*_IN6 operations.
344	 */
345	switch (cmd) {
346	case SIOCAIFADDR_IN6:
347	case SIOCSIFPHYADDR_IN6:
348		sa6 = &ifra->ifra_addr;
349		break;
350	case SIOCSIFADDR_IN6:
351	case SIOCGIFADDR_IN6:
352	case SIOCSIFDSTADDR_IN6:
353	case SIOCSIFNETMASK_IN6:
354	case SIOCGIFDSTADDR_IN6:
355	case SIOCGIFNETMASK_IN6:
356	case SIOCDIFADDR_IN6:
357	case SIOCGIFPSRCADDR_IN6:
358	case SIOCGIFPDSTADDR_IN6:
359	case SIOCGIFAFLAG_IN6:
360	case SIOCSNDFLUSH_IN6:
361	case SIOCSPFXFLUSH_IN6:
362	case SIOCSRTRFLUSH_IN6:
363	case SIOCGIFALIFETIME_IN6:
364	case SIOCSIFALIFETIME_IN6:
365	case SIOCGIFSTAT_IN6:
366	case SIOCGIFSTAT_ICMP6:
367		sa6 = &ifr->ifr_addr;
368		break;
369	case SIOCSIFADDR:
370	case SIOCSIFBRDADDR:
371	case SIOCSIFDSTADDR:
372	case SIOCSIFNETMASK:
373		/*
374		 * Although we should pass any non-INET6 ioctl requests
375		 * down to driver, we filter some legacy INET requests.
376		 * Drivers trust SIOCSIFADDR et al to come from an already
377		 * privileged layer, and do not perform any credentials
378		 * checks or input validation.
379		 */
380		return (EINVAL);
381	default:
382		sa6 = NULL;
383		break;
384	}
385	if (sa6 && sa6->sin6_family == AF_INET6) {
386		if (sa6->sin6_scope_id != 0)
387			error = sa6_embedscope(sa6, 0);
388		else
389			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
390		if (error != 0)
391			return (error);
392		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
393		    &sa6->sin6_addr)) != 0)
394			return (error);
395		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
396	} else
397		ia = NULL;
398
399	switch (cmd) {
400	case SIOCSIFADDR_IN6:
401	case SIOCSIFDSTADDR_IN6:
402	case SIOCSIFNETMASK_IN6:
403		/*
404		 * Since IPv6 allows a node to assign multiple addresses
405		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
406		 */
407		/* we decided to obsolete this command (20000704) */
408		error = EINVAL;
409		goto out;
410
411	case SIOCDIFADDR_IN6:
412		/*
413		 * for IPv4, we look for existing in_ifaddr here to allow
414		 * "ifconfig if0 delete" to remove the first IPv4 address on
415		 * the interface.  For IPv6, as the spec allows multiple
416		 * interface address from the day one, we consider "remove the
417		 * first one" semantics to be not preferable.
418		 */
419		if (ia == NULL) {
420			error = EADDRNOTAVAIL;
421			goto out;
422		}
423		/* FALLTHROUGH */
424	case SIOCAIFADDR_IN6:
425		/*
426		 * We always require users to specify a valid IPv6 address for
427		 * the corresponding operation.
428		 */
429		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
430		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
431			error = EAFNOSUPPORT;
432			goto out;
433		}
434
435		if (td != NULL) {
436			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
437			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
438			if (error)
439				goto out;
440		}
441		/* FALLTHROUGH */
442	case SIOCGIFSTAT_IN6:
443	case SIOCGIFSTAT_ICMP6:
444		if (ifp->if_afdata[AF_INET6] == NULL) {
445			error = EPFNOSUPPORT;
446			goto out;
447		}
448		break;
449
450	case SIOCGIFADDR_IN6:
451		/* This interface is basically deprecated. use SIOCGIFCONF. */
452		/* FALLTHROUGH */
453	case SIOCGIFAFLAG_IN6:
454	case SIOCGIFNETMASK_IN6:
455	case SIOCGIFDSTADDR_IN6:
456	case SIOCGIFALIFETIME_IN6:
457		/* must think again about its semantics */
458		if (ia == NULL) {
459			error = EADDRNOTAVAIL;
460			goto out;
461		}
462		break;
463
464	case SIOCSIFALIFETIME_IN6:
465	    {
466		struct in6_addrlifetime *lt;
467
468		if (td != NULL) {
469			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
470			if (error)
471				goto out;
472		}
473		if (ia == NULL) {
474			error = EADDRNOTAVAIL;
475			goto out;
476		}
477		/* sanity for overflow - beware unsigned */
478		lt = &ifr->ifr_ifru.ifru_lifetime;
479		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
480		    lt->ia6t_vltime + time_uptime < time_uptime) {
481			error = EINVAL;
482			goto out;
483		}
484		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
485		    lt->ia6t_pltime + time_uptime < time_uptime) {
486			error = EINVAL;
487			goto out;
488		}
489		break;
490	    }
491	}
492
493	switch (cmd) {
494	case SIOCGIFADDR_IN6:
495		ifr->ifr_addr = ia->ia_addr;
496		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
497			goto out;
498		break;
499
500	case SIOCGIFDSTADDR_IN6:
501		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
502			error = EINVAL;
503			goto out;
504		}
505		/*
506		 * XXX: should we check if ifa_dstaddr is NULL and return
507		 * an error?
508		 */
509		ifr->ifr_dstaddr = ia->ia_dstaddr;
510		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
511			goto out;
512		break;
513
514	case SIOCGIFNETMASK_IN6:
515		ifr->ifr_addr = ia->ia_prefixmask;
516		break;
517
518	case SIOCGIFAFLAG_IN6:
519		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
520		break;
521
522	case SIOCGIFSTAT_IN6:
523		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
524		    ifp->if_afdata[AF_INET6])->in6_ifstat,
525		    &ifr->ifr_ifru.ifru_stat,
526		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
527		break;
528
529	case SIOCGIFSTAT_ICMP6:
530		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
531		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
532		    &ifr->ifr_ifru.ifru_icmp6stat,
533		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
534		break;
535
536	case SIOCGIFALIFETIME_IN6:
537		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
538		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
539			time_t maxexpire;
540			struct in6_addrlifetime *retlt =
541			    &ifr->ifr_ifru.ifru_lifetime;
542
543			/*
544			 * XXX: adjust expiration time assuming time_t is
545			 * signed.
546			 */
547			maxexpire = (-1) &
548			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
549			if (ia->ia6_lifetime.ia6t_vltime <
550			    maxexpire - ia->ia6_updatetime) {
551				retlt->ia6t_expire = ia->ia6_updatetime +
552				    ia->ia6_lifetime.ia6t_vltime;
553			} else
554				retlt->ia6t_expire = maxexpire;
555		}
556		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
557			time_t maxexpire;
558			struct in6_addrlifetime *retlt =
559			    &ifr->ifr_ifru.ifru_lifetime;
560
561			/*
562			 * XXX: adjust expiration time assuming time_t is
563			 * signed.
564			 */
565			maxexpire = (-1) &
566			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
567			if (ia->ia6_lifetime.ia6t_pltime <
568			    maxexpire - ia->ia6_updatetime) {
569				retlt->ia6t_preferred = ia->ia6_updatetime +
570				    ia->ia6_lifetime.ia6t_pltime;
571			} else
572				retlt->ia6t_preferred = maxexpire;
573		}
574		break;
575
576	case SIOCSIFALIFETIME_IN6:
577		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
578		/* for sanity */
579		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
580			ia->ia6_lifetime.ia6t_expire =
581				time_uptime + ia->ia6_lifetime.ia6t_vltime;
582		} else
583			ia->ia6_lifetime.ia6t_expire = 0;
584		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
585			ia->ia6_lifetime.ia6t_preferred =
586				time_uptime + ia->ia6_lifetime.ia6t_pltime;
587		} else
588			ia->ia6_lifetime.ia6t_preferred = 0;
589		break;
590
591	case SIOCAIFADDR_IN6:
592	{
593		struct nd_prefixctl pr0;
594		struct nd_prefix *pr;
595
596		/*
597		 * first, make or update the interface address structure,
598		 * and link it to the list.
599		 */
600		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
601			goto out;
602		if (ia != NULL)
603			ifa_free(&ia->ia_ifa);
604		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
605		    == NULL) {
606			/*
607			 * this can happen when the user specify the 0 valid
608			 * lifetime.
609			 */
610			break;
611		}
612
613		if (cmd == ocmd && ifra->ifra_vhid > 0) {
614			if (carp_attach_p != NULL)
615				error = (*carp_attach_p)(&ia->ia_ifa,
616				    ifra->ifra_vhid);
617			else
618				error = EPROTONOSUPPORT;
619			if (error)
620				goto out;
621			else
622				carp_attached = 1;
623		}
624
625		/*
626		 * then, make the prefix on-link on the interface.
627		 * XXX: we'd rather create the prefix before the address, but
628		 * we need at least one address to install the corresponding
629		 * interface route, so we configure the address first.
630		 */
631
632		/*
633		 * convert mask to prefix length (prefixmask has already
634		 * been validated in in6_update_ifa().
635		 */
636		bzero(&pr0, sizeof(pr0));
637		pr0.ndpr_ifp = ifp;
638		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
639		    NULL);
640		if (pr0.ndpr_plen == 128) {
641			/* we don't need to install a host route. */
642			goto aifaddr_out;
643		}
644		pr0.ndpr_prefix = ifra->ifra_addr;
645		/* apply the mask for safety. */
646		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
647		    &ifra->ifra_prefixmask.sin6_addr);
648
649		/*
650		 * XXX: since we don't have an API to set prefix (not address)
651		 * lifetimes, we just use the same lifetimes as addresses.
652		 * The (temporarily) installed lifetimes can be overridden by
653		 * later advertised RAs (when accept_rtadv is non 0), which is
654		 * an intended behavior.
655		 */
656		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
657		pr0.ndpr_raf_auto =
658		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
659		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
660		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
661
662		/* add the prefix if not yet. */
663		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
664			/*
665			 * nd6_prelist_add will install the corresponding
666			 * interface route.
667			 */
668			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
669				if (carp_attached)
670					(*carp_detach_p)(&ia->ia_ifa);
671				goto out;
672			}
673			if (pr == NULL) {
674				if (carp_attached)
675					(*carp_detach_p)(&ia->ia_ifa);
676				log(LOG_ERR, "nd6_prelist_add succeeded but "
677				    "no prefix\n");
678				error = EINVAL;
679				goto out;
680			}
681		}
682
683		/* relate the address to the prefix */
684		if (ia->ia6_ndpr == NULL) {
685			ia->ia6_ndpr = pr;
686			pr->ndpr_refcnt++;
687
688			/*
689			 * If this is the first autoconf address from the
690			 * prefix, create a temporary address as well
691			 * (when required).
692			 */
693			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
694			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
695				int e;
696				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
697					log(LOG_NOTICE, "in6_control: failed "
698					    "to create a temporary address, "
699					    "errno=%d\n", e);
700				}
701			}
702		}
703
704		/*
705		 * this might affect the status of autoconfigured addresses,
706		 * that is, this address might make other addresses detached.
707		 */
708		pfxlist_onlink_check();
709aifaddr_out:
710		if (error != 0 || ia == NULL)
711			break;
712		/*
713		 * Try to clear the flag when a new IPv6 address is added
714		 * onto an IFDISABLED interface and it succeeds.
715		 */
716		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
717			struct in6_ndireq nd;
718
719			memset(&nd, 0, sizeof(nd));
720			nd.ndi.flags = ND_IFINFO(ifp)->flags;
721			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
722			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
723				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
724				    "SIOCSIFINFO_FLAGS for -ifdisabled "
725				    "failed.");
726			/*
727			 * Ignore failure of clearing the flag intentionally.
728			 * The failure means address duplication was detected.
729			 */
730		}
731		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
732		break;
733	}
734
735	case SIOCDIFADDR_IN6:
736	{
737		struct nd_prefix *pr;
738
739		/*
740		 * If the address being deleted is the only one that owns
741		 * the corresponding prefix, expire the prefix as well.
742		 * XXX: theoretically, we don't have to worry about such
743		 * relationship, since we separate the address management
744		 * and the prefix management.  We do this, however, to provide
745		 * as much backward compatibility as possible in terms of
746		 * the ioctl operation.
747		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
748		 */
749		pr = ia->ia6_ndpr;
750		in6_purgeaddr(&ia->ia_ifa);
751		if (pr && pr->ndpr_refcnt == 0)
752			prelist_remove(pr);
753		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
754		break;
755	}
756
757	default:
758		if (ifp->if_ioctl == NULL) {
759			error = EOPNOTSUPP;
760			goto out;
761		}
762		error = (*ifp->if_ioctl)(ifp, cmd, data);
763		goto out;
764	}
765
766	error = 0;
767out:
768	if (ia != NULL)
769		ifa_free(&ia->ia_ifa);
770	return (error);
771}
772
773
774/*
775 * Join necessary multicast groups.  Factored out from in6_update_ifa().
776 * This entire work should only be done once, for the default FIB.
777 */
778static int
779in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
780    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
781{
782	char ip6buf[INET6_ADDRSTRLEN];
783	struct in6_addr mltaddr;
784	struct in6_multi_mship *imm;
785	int delay, error;
786
787	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
788
789	/* Join solicited multicast addr for new host id. */
790	bzero(&mltaddr, sizeof(struct in6_addr));
791	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
792	mltaddr.s6_addr32[2] = htonl(1);
793	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
794	mltaddr.s6_addr8[12] = 0xff;
795	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
796		/* XXX: should not happen */
797		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
798		goto cleanup;
799	}
800	delay = error = 0;
801	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
802		/*
803		 * We need a random delay for DAD on the address being
804		 * configured.  It also means delaying transmission of the
805		 * corresponding MLD report to avoid report collision.
806		 * [RFC 4861, Section 6.3.7]
807		 */
808		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
809	}
810	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
811	if (imm == NULL) {
812		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
813		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
814		    if_name(ifp), error));
815		goto cleanup;
816	}
817	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
818	*in6m_sol = imm->i6mm_maddr;
819
820	/*
821	 * Join link-local all-nodes address.
822	 */
823	mltaddr = in6addr_linklocal_allnodes;
824	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
825		goto cleanup; /* XXX: should not fail */
826
827	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
828	if (imm == NULL) {
829		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
830		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
831		    if_name(ifp), error));
832		goto cleanup;
833	}
834	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
835
836	/*
837	 * Join node information group address.
838	 */
839	delay = 0;
840	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
841		/*
842		 * The spec does not say anything about delay for this group,
843		 * but the same logic should apply.
844		 */
845		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
846	}
847	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
848		/* XXX jinmei */
849		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
850		if (imm == NULL)
851			nd6log((LOG_WARNING,
852			    "%s: in6_joingroup failed for %s on %s "
853			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
854			    &mltaddr), if_name(ifp), error));
855			/* XXX not very fatal, go on... */
856		else
857			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
858	}
859	if (V_icmp6_nodeinfo_oldmcprefix &&
860	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
861		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
862		if (imm == NULL)
863			nd6log((LOG_WARNING,
864			    "%s: in6_joingroup failed for %s on %s "
865			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
866			    &mltaddr), if_name(ifp), error));
867			/* XXX not very fatal, go on... */
868		else
869			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
870	}
871
872	/*
873	 * Join interface-local all-nodes address.
874	 * (ff01::1%ifN, and ff01::%ifN/32)
875	 */
876	mltaddr = in6addr_nodelocal_allnodes;
877	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
878		goto cleanup; /* XXX: should not fail */
879
880	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
881	if (imm == NULL) {
882		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
883		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
884		    &mltaddr), if_name(ifp), error));
885		goto cleanup;
886	}
887	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
888
889cleanup:
890	return (error);
891}
892
893/*
894 * Update parameters of an IPv6 interface address.
895 * If necessary, a new entry is created and linked into address chains.
896 * This function is separated from in6_control().
897 */
898int
899in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
900    struct in6_ifaddr *ia, int flags)
901{
902	int error, hostIsNew = 0;
903
904	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
905		return (error);
906
907	if (ia == NULL) {
908		hostIsNew = 1;
909		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
910			return (ENOBUFS);
911	}
912
913	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
914	if (error != 0) {
915		if (hostIsNew != 0) {
916			in6_unlink_ifa(ia, ifp);
917			ifa_free(&ia->ia_ifa);
918		}
919		return (error);
920	}
921
922	if (hostIsNew)
923		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
924
925	return (error);
926}
927
928/*
929 * Fill in basic IPv6 address request info.
930 */
931void
932in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
933    const struct in6_addr *mask)
934{
935
936	memset(ifra, 0, sizeof(struct in6_aliasreq));
937
938	ifra->ifra_addr.sin6_family = AF_INET6;
939	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
940	if (addr != NULL)
941		ifra->ifra_addr.sin6_addr = *addr;
942
943	ifra->ifra_prefixmask.sin6_family = AF_INET6;
944	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
945	if (mask != NULL)
946		ifra->ifra_prefixmask.sin6_addr = *mask;
947}
948
949static int
950in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
951    struct in6_ifaddr *ia, int flags)
952{
953	int plen = -1;
954	struct sockaddr_in6 dst6;
955	struct in6_addrlifetime *lt;
956	char ip6buf[INET6_ADDRSTRLEN];
957
958	/* Validate parameters */
959	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
960		return (EINVAL);
961
962	/*
963	 * The destination address for a p2p link must have a family
964	 * of AF_UNSPEC or AF_INET6.
965	 */
966	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
967	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
968	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
969		return (EAFNOSUPPORT);
970
971	/*
972	 * Validate address
973	 */
974	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
975	    ifra->ifra_addr.sin6_family != AF_INET6)
976		return (EINVAL);
977
978	/*
979	 * validate ifra_prefixmask.  don't check sin6_family, netmask
980	 * does not carry fields other than sin6_len.
981	 */
982	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
983		return (EINVAL);
984	/*
985	 * Because the IPv6 address architecture is classless, we require
986	 * users to specify a (non 0) prefix length (mask) for a new address.
987	 * We also require the prefix (when specified) mask is valid, and thus
988	 * reject a non-consecutive mask.
989	 */
990	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
991		return (EINVAL);
992	if (ifra->ifra_prefixmask.sin6_len != 0) {
993		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
994		    (u_char *)&ifra->ifra_prefixmask +
995		    ifra->ifra_prefixmask.sin6_len);
996		if (plen <= 0)
997			return (EINVAL);
998	} else {
999		/*
1000		 * In this case, ia must not be NULL.  We just use its prefix
1001		 * length.
1002		 */
1003		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1004	}
1005	/*
1006	 * If the destination address on a p2p interface is specified,
1007	 * and the address is a scoped one, validate/set the scope
1008	 * zone identifier.
1009	 */
1010	dst6 = ifra->ifra_dstaddr;
1011	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1012	    (dst6.sin6_family == AF_INET6)) {
1013		struct in6_addr in6_tmp;
1014		u_int32_t zoneid;
1015
1016		in6_tmp = dst6.sin6_addr;
1017		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1018			return (EINVAL); /* XXX: should be impossible */
1019
1020		if (dst6.sin6_scope_id != 0) {
1021			if (dst6.sin6_scope_id != zoneid)
1022				return (EINVAL);
1023		} else		/* user omit to specify the ID. */
1024			dst6.sin6_scope_id = zoneid;
1025
1026		/* convert into the internal form */
1027		if (sa6_embedscope(&dst6, 0))
1028			return (EINVAL); /* XXX: should be impossible */
1029	}
1030	/* Modify original ifra_dstaddr to reflect changes */
1031	ifra->ifra_dstaddr = dst6;
1032
1033	/*
1034	 * The destination address can be specified only for a p2p or a
1035	 * loopback interface.  If specified, the corresponding prefix length
1036	 * must be 128.
1037	 */
1038	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1039		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1040			/* XXX: noisy message */
1041			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1042			    "be specified for a p2p or a loopback IF only\n"));
1043			return (EINVAL);
1044		}
1045		if (plen != 128) {
1046			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1047			    "be 128 when dstaddr is specified\n"));
1048			return (EINVAL);
1049		}
1050	}
1051	/* lifetime consistency check */
1052	lt = &ifra->ifra_lifetime;
1053	if (lt->ia6t_pltime > lt->ia6t_vltime)
1054		return (EINVAL);
1055	if (lt->ia6t_vltime == 0) {
1056		/*
1057		 * the following log might be noisy, but this is a typical
1058		 * configuration mistake or a tool's bug.
1059		 */
1060		nd6log((LOG_INFO,
1061		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1062		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1063
1064		if (ia == NULL)
1065			return (0); /* there's nothing to do */
1066	}
1067
1068	/* Check prefix mask */
1069	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1070		/*
1071		 * We prohibit changing the prefix length of an existing
1072		 * address, because
1073		 * + such an operation should be rare in IPv6, and
1074		 * + the operation would confuse prefix management.
1075		 */
1076		if (ia->ia_prefixmask.sin6_len != 0 &&
1077		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1078			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1079			    "of an existing %s address should not be changed\n",
1080			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1081
1082			return (EINVAL);
1083		}
1084	}
1085
1086	return (0);
1087}
1088
1089
1090/*
1091 * Allocate a new ifaddr and link it into chains.
1092 */
1093static struct in6_ifaddr *
1094in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1095{
1096	struct in6_ifaddr *ia;
1097
1098	/*
1099	 * When in6_alloc_ifa() is called in a process of a received
1100	 * RA, it is called under an interrupt context.  So, we should
1101	 * call malloc with M_NOWAIT.
1102	 */
1103	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1104	if (ia == NULL)
1105		return (NULL);
1106	LIST_INIT(&ia->ia6_memberships);
1107	/* Initialize the address and masks, and put time stamp */
1108	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1109	ia->ia_addr.sin6_family = AF_INET6;
1110	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1111	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1112	ia->ia_addr = ifra->ifra_addr;
1113	ia->ia6_createtime = time_uptime;
1114	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1115		/*
1116		 * Some functions expect that ifa_dstaddr is not
1117		 * NULL for p2p interfaces.
1118		 */
1119		ia->ia_ifa.ifa_dstaddr =
1120		    (struct sockaddr *)&ia->ia_dstaddr;
1121	} else {
1122		ia->ia_ifa.ifa_dstaddr = NULL;
1123	}
1124
1125	/* set prefix mask if any */
1126	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1127	if (ifra->ifra_prefixmask.sin6_len != 0) {
1128		ia->ia_prefixmask.sin6_family = AF_INET6;
1129		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1130		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1131	}
1132
1133	ia->ia_ifp = ifp;
1134	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1135	IF_ADDR_WLOCK(ifp);
1136	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1137	IF_ADDR_WUNLOCK(ifp);
1138
1139	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1140	IN6_IFADDR_WLOCK();
1141	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1142	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1143	IN6_IFADDR_WUNLOCK();
1144
1145	return (ia);
1146}
1147
1148/*
1149 * Update/configure interface address parameters:
1150 *
1151 * 1) Update lifetime
1152 * 2) Update interface metric ad flags
1153 * 3) Notify other subsystems
1154 */
1155static int
1156in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1157    struct in6_ifaddr *ia, int hostIsNew, int flags)
1158{
1159	int error;
1160
1161	/* update timestamp */
1162	ia->ia6_updatetime = time_uptime;
1163
1164	/*
1165	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1166	 * to see if the address is deprecated or invalidated, but initialize
1167	 * these members for applications.
1168	 */
1169	ia->ia6_lifetime = ifra->ifra_lifetime;
1170	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1171		ia->ia6_lifetime.ia6t_expire =
1172		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1173	} else
1174		ia->ia6_lifetime.ia6t_expire = 0;
1175	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1176		ia->ia6_lifetime.ia6t_preferred =
1177		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1178	} else
1179		ia->ia6_lifetime.ia6t_preferred = 0;
1180
1181	/*
1182	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1183	 * userland, make it deprecated.
1184	 */
1185	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1186		ia->ia6_lifetime.ia6t_pltime = 0;
1187		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1188	}
1189
1190	/*
1191	 * configure address flags.
1192	 */
1193	ia->ia6_flags = ifra->ifra_flags;
1194
1195	/*
1196	 * Make the address tentative before joining multicast addresses,
1197	 * so that corresponding MLD responses would not have a tentative
1198	 * source address.
1199	 */
1200	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1201	if (hostIsNew && in6if_do_dad(ifp))
1202		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1203
1204	/* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1205	if (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 */
1221static int
1222in6_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
1284void
1285in6_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
1332static void
1333in6_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 */
1382static int
1383in6_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 */
1469struct in6_ifaddr *
1470in6ifa_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 */
1496struct in6_ifaddr *
1497in6ifa_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 */
1520struct in6_ifaddr *
1521in6ifa_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 */
1542struct in6_ifaddr *
1543in6ifa_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 */
1569static char digits[] = "0123456789abcdef";
1570char *
1571ip6_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
1647int
1648in6_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 */
1673int
1674in6_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 */
1693int
1694in6_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
1720int
1721in6_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 */
1745int
1746in6_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 */
1765int
1766in6_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
1790void
1791in6_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 */
1816struct in6_ifaddr *
1817in6_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 */
1910void
1911in6_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
1940int
1941in6if_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 */
1970void
1971in6_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 */
1998int
1999in6_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
2043struct 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 */
2056static void
2057in6_lltable_destroy_lle(struct llentry *lle)
2058{
2059
2060	LLE_WUNLOCK(lle);
2061	LLE_LOCK_DESTROY(lle);
2062	free(lle, M_LLTABLE);
2063}
2064
2065static struct llentry *
2066in6_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
2083static int
2084in6_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
2098static void
2099in6_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
2120static int
2121in6_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
2158static inline uint32_t
2159in6_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
2165static uint32_t
2166in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2167{
2168
2169	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2170}
2171
2172static void
2173in6_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
2184static inline struct llentry *
2185in6_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
2203static int
2204in6_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
2235static struct llentry *
2236in6_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
2272static struct llentry *
2273in6_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
2295static int
2296in6_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 invalid entries */
2317			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
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
2361static struct lltable *
2362in6_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
2383void *
2384in6_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
2418int
2419in6_domifmtu(struct ifnet *ifp)
2420{
2421
2422	return (IN6_LINKMTU(ifp));
2423}
2424
2425void
2426in6_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 */
2447void
2448in6_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. */
2459void
2460in6_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. */
2473void
2474in6_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. */
2489void
2490in6_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