in6.c revision dc494194a2039a69fc3073f4ef4d628b955a0b25
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 SIOCGNBRINFO_IN6:
285	case SIOCGDEFIFACE_IN6:
286		return (nd6_ioctl(cmd, data, ifp));
287
288#ifdef COMPAT_FREEBSD32
289	case SIOCGDEFIFACE32_IN6:
290		{
291			struct in6_ndifreq ndif;
292			struct in6_ndifreq32 *ndif32;
293
294			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
295			    ifp);
296			if (error)
297				return (error);
298			ndif32 = (struct in6_ndifreq32 *)data;
299			ndif32->ifindex = ndif.ifindex;
300			return (0);
301		}
302#endif
303	}
304
305	switch (cmd) {
306	case SIOCSIFPREFIX_IN6:
307	case SIOCDIFPREFIX_IN6:
308	case SIOCAIFPREFIX_IN6:
309	case SIOCCIFPREFIX_IN6:
310	case SIOCSGIFPREFIX_IN6:
311	case SIOCGIFPREFIX_IN6:
312		log(LOG_NOTICE,
313		    "prefix ioctls are now invalidated. "
314		    "please use ifconfig.\n");
315		return (EOPNOTSUPP);
316	}
317
318	switch (cmd) {
319	case SIOCSSCOPE6:
320		if (td != NULL) {
321			error = priv_check(td, PRIV_NETINET_SCOPE6);
322			if (error)
323				return (error);
324		}
325		/* FALLTHROUGH */
326	case SIOCGSCOPE6:
327	case SIOCGSCOPE6DEF:
328		return (scope6_ioctl(cmd, data, ifp));
329	}
330
331	/*
332	 * Find address for this interface, if it exists.
333	 *
334	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
335	 * only, and used the first interface address as the target of other
336	 * operations (without checking ifra_addr).  This was because netinet
337	 * code/API assumed at most 1 interface address per interface.
338	 * Since IPv6 allows a node to assign multiple addresses
339	 * on a single interface, we almost always look and check the
340	 * presence of ifra_addr, and reject invalid ones here.
341	 * It also decreases duplicated code among SIOC*_IN6 operations.
342	 */
343	switch (cmd) {
344	case SIOCAIFADDR_IN6:
345	case SIOCSIFPHYADDR_IN6:
346		sa6 = &ifra->ifra_addr;
347		break;
348	case SIOCSIFADDR_IN6:
349	case SIOCGIFADDR_IN6:
350	case SIOCSIFDSTADDR_IN6:
351	case SIOCSIFNETMASK_IN6:
352	case SIOCGIFDSTADDR_IN6:
353	case SIOCGIFNETMASK_IN6:
354	case SIOCDIFADDR_IN6:
355	case SIOCGIFPSRCADDR_IN6:
356	case SIOCGIFPDSTADDR_IN6:
357	case SIOCGIFAFLAG_IN6:
358	case SIOCSNDFLUSH_IN6:
359	case SIOCSPFXFLUSH_IN6:
360	case SIOCSRTRFLUSH_IN6:
361	case SIOCGIFALIFETIME_IN6:
362	case SIOCSIFALIFETIME_IN6:
363	case SIOCGIFSTAT_IN6:
364	case SIOCGIFSTAT_ICMP6:
365		sa6 = &ifr->ifr_addr;
366		break;
367	case SIOCSIFADDR:
368	case SIOCSIFBRDADDR:
369	case SIOCSIFDSTADDR:
370	case SIOCSIFNETMASK:
371		/*
372		 * Although we should pass any non-INET6 ioctl requests
373		 * down to driver, we filter some legacy INET requests.
374		 * Drivers trust SIOCSIFADDR et al to come from an already
375		 * privileged layer, and do not perform any credentials
376		 * checks or input validation.
377		 */
378		return (EINVAL);
379	default:
380		sa6 = NULL;
381		break;
382	}
383	if (sa6 && sa6->sin6_family == AF_INET6) {
384		if (sa6->sin6_scope_id != 0)
385			error = sa6_embedscope(sa6, 0);
386		else
387			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
388		if (error != 0)
389			return (error);
390		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
391		    &sa6->sin6_addr)) != 0)
392			return (error);
393		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
394	} else
395		ia = NULL;
396
397	switch (cmd) {
398	case SIOCSIFADDR_IN6:
399	case SIOCSIFDSTADDR_IN6:
400	case SIOCSIFNETMASK_IN6:
401		/*
402		 * Since IPv6 allows a node to assign multiple addresses
403		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
404		 */
405		/* we decided to obsolete this command (20000704) */
406		error = EINVAL;
407		goto out;
408
409	case SIOCDIFADDR_IN6:
410		/*
411		 * for IPv4, we look for existing in_ifaddr here to allow
412		 * "ifconfig if0 delete" to remove the first IPv4 address on
413		 * the interface.  For IPv6, as the spec allows multiple
414		 * interface address from the day one, we consider "remove the
415		 * first one" semantics to be not preferable.
416		 */
417		if (ia == NULL) {
418			error = EADDRNOTAVAIL;
419			goto out;
420		}
421		/* FALLTHROUGH */
422	case SIOCAIFADDR_IN6:
423		/*
424		 * We always require users to specify a valid IPv6 address for
425		 * the corresponding operation.
426		 */
427		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
428		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
429			error = EAFNOSUPPORT;
430			goto out;
431		}
432
433		if (td != NULL) {
434			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
435			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
436			if (error)
437				goto out;
438		}
439		/* FALLTHROUGH */
440	case SIOCGIFSTAT_IN6:
441	case SIOCGIFSTAT_ICMP6:
442		if (ifp->if_afdata[AF_INET6] == NULL) {
443			error = EPFNOSUPPORT;
444			goto out;
445		}
446		break;
447
448	case SIOCGIFADDR_IN6:
449		/* This interface is basically deprecated. use SIOCGIFCONF. */
450		/* FALLTHROUGH */
451	case SIOCGIFAFLAG_IN6:
452	case SIOCGIFNETMASK_IN6:
453	case SIOCGIFDSTADDR_IN6:
454	case SIOCGIFALIFETIME_IN6:
455		/* must think again about its semantics */
456		if (ia == NULL) {
457			error = EADDRNOTAVAIL;
458			goto out;
459		}
460		break;
461
462	case SIOCSIFALIFETIME_IN6:
463	    {
464		struct in6_addrlifetime *lt;
465
466		if (td != NULL) {
467			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
468			if (error)
469				goto out;
470		}
471		if (ia == NULL) {
472			error = EADDRNOTAVAIL;
473			goto out;
474		}
475		/* sanity for overflow - beware unsigned */
476		lt = &ifr->ifr_ifru.ifru_lifetime;
477		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
478		    lt->ia6t_vltime + time_uptime < time_uptime) {
479			error = EINVAL;
480			goto out;
481		}
482		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
483		    lt->ia6t_pltime + time_uptime < time_uptime) {
484			error = EINVAL;
485			goto out;
486		}
487		break;
488	    }
489	}
490
491	switch (cmd) {
492	case SIOCGIFADDR_IN6:
493		ifr->ifr_addr = ia->ia_addr;
494		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
495			goto out;
496		break;
497
498	case SIOCGIFDSTADDR_IN6:
499		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
500			error = EINVAL;
501			goto out;
502		}
503		/*
504		 * XXX: should we check if ifa_dstaddr is NULL and return
505		 * an error?
506		 */
507		ifr->ifr_dstaddr = ia->ia_dstaddr;
508		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
509			goto out;
510		break;
511
512	case SIOCGIFNETMASK_IN6:
513		ifr->ifr_addr = ia->ia_prefixmask;
514		break;
515
516	case SIOCGIFAFLAG_IN6:
517		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
518		break;
519
520	case SIOCGIFSTAT_IN6:
521		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
522		    ifp->if_afdata[AF_INET6])->in6_ifstat,
523		    &ifr->ifr_ifru.ifru_stat,
524		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
525		break;
526
527	case SIOCGIFSTAT_ICMP6:
528		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
529		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
530		    &ifr->ifr_ifru.ifru_icmp6stat,
531		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
532		break;
533
534	case SIOCGIFALIFETIME_IN6:
535		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
536		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
537			time_t maxexpire;
538			struct in6_addrlifetime *retlt =
539			    &ifr->ifr_ifru.ifru_lifetime;
540
541			/*
542			 * XXX: adjust expiration time assuming time_t is
543			 * signed.
544			 */
545			maxexpire = (-1) &
546			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
547			if (ia->ia6_lifetime.ia6t_vltime <
548			    maxexpire - ia->ia6_updatetime) {
549				retlt->ia6t_expire = ia->ia6_updatetime +
550				    ia->ia6_lifetime.ia6t_vltime;
551			} else
552				retlt->ia6t_expire = maxexpire;
553		}
554		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
555			time_t maxexpire;
556			struct in6_addrlifetime *retlt =
557			    &ifr->ifr_ifru.ifru_lifetime;
558
559			/*
560			 * XXX: adjust expiration time assuming time_t is
561			 * signed.
562			 */
563			maxexpire = (-1) &
564			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
565			if (ia->ia6_lifetime.ia6t_pltime <
566			    maxexpire - ia->ia6_updatetime) {
567				retlt->ia6t_preferred = ia->ia6_updatetime +
568				    ia->ia6_lifetime.ia6t_pltime;
569			} else
570				retlt->ia6t_preferred = maxexpire;
571		}
572		break;
573
574	case SIOCSIFALIFETIME_IN6:
575		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
576		/* for sanity */
577		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
578			ia->ia6_lifetime.ia6t_expire =
579				time_uptime + ia->ia6_lifetime.ia6t_vltime;
580		} else
581			ia->ia6_lifetime.ia6t_expire = 0;
582		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
583			ia->ia6_lifetime.ia6t_preferred =
584				time_uptime + ia->ia6_lifetime.ia6t_pltime;
585		} else
586			ia->ia6_lifetime.ia6t_preferred = 0;
587		break;
588
589	case SIOCAIFADDR_IN6:
590	{
591		struct nd_prefixctl pr0;
592		struct nd_prefix *pr;
593
594		/*
595		 * first, make or update the interface address structure,
596		 * and link it to the list.
597		 */
598		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
599			goto out;
600		if (ia != NULL)
601			ifa_free(&ia->ia_ifa);
602		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
603		    == NULL) {
604			/*
605			 * this can happen when the user specify the 0 valid
606			 * lifetime.
607			 */
608			break;
609		}
610
611		if (cmd == ocmd && ifra->ifra_vhid > 0) {
612			if (carp_attach_p != NULL)
613				error = (*carp_attach_p)(&ia->ia_ifa,
614				    ifra->ifra_vhid);
615			else
616				error = EPROTONOSUPPORT;
617			if (error)
618				goto out;
619			else
620				carp_attached = 1;
621		}
622
623		/*
624		 * then, make the prefix on-link on the interface.
625		 * XXX: we'd rather create the prefix before the address, but
626		 * we need at least one address to install the corresponding
627		 * interface route, so we configure the address first.
628		 */
629
630		/*
631		 * convert mask to prefix length (prefixmask has already
632		 * been validated in in6_update_ifa().
633		 */
634		bzero(&pr0, sizeof(pr0));
635		pr0.ndpr_ifp = ifp;
636		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
637		    NULL);
638		if (pr0.ndpr_plen == 128) {
639			/* we don't need to install a host route. */
640			goto aifaddr_out;
641		}
642		pr0.ndpr_prefix = ifra->ifra_addr;
643		/* apply the mask for safety. */
644		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
645		    &ifra->ifra_prefixmask.sin6_addr);
646
647		/*
648		 * XXX: since we don't have an API to set prefix (not address)
649		 * lifetimes, we just use the same lifetimes as addresses.
650		 * The (temporarily) installed lifetimes can be overridden by
651		 * later advertised RAs (when accept_rtadv is non 0), which is
652		 * an intended behavior.
653		 */
654		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
655		pr0.ndpr_raf_auto =
656		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
657		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
658		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
659
660		/* add the prefix if not yet. */
661		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
662			/*
663			 * nd6_prelist_add will install the corresponding
664			 * interface route.
665			 */
666			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
667				if (carp_attached)
668					(*carp_detach_p)(&ia->ia_ifa);
669				goto out;
670			}
671			if (pr == NULL) {
672				if (carp_attached)
673					(*carp_detach_p)(&ia->ia_ifa);
674				log(LOG_ERR, "nd6_prelist_add succeeded but "
675				    "no prefix\n");
676				error = EINVAL;
677				goto out;
678			}
679		}
680
681		/* relate the address to the prefix */
682		if (ia->ia6_ndpr == NULL) {
683			ia->ia6_ndpr = pr;
684			pr->ndpr_refcnt++;
685
686			/*
687			 * If this is the first autoconf address from the
688			 * prefix, create a temporary address as well
689			 * (when required).
690			 */
691			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
692			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
693				int e;
694				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
695					log(LOG_NOTICE, "in6_control: failed "
696					    "to create a temporary address, "
697					    "errno=%d\n", e);
698				}
699			}
700		}
701
702		/*
703		 * this might affect the status of autoconfigured addresses,
704		 * that is, this address might make other addresses detached.
705		 */
706		pfxlist_onlink_check();
707aifaddr_out:
708		if (error != 0 || ia == NULL)
709			break;
710		/*
711		 * Try to clear the flag when a new IPv6 address is added
712		 * onto an IFDISABLED interface and it succeeds.
713		 */
714		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
715			struct in6_ndireq nd;
716
717			memset(&nd, 0, sizeof(nd));
718			nd.ndi.flags = ND_IFINFO(ifp)->flags;
719			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
720			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
721				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
722				    "SIOCSIFINFO_FLAGS for -ifdisabled "
723				    "failed.");
724			/*
725			 * Ignore failure of clearing the flag intentionally.
726			 * The failure means address duplication was detected.
727			 */
728		}
729		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
730		break;
731	}
732
733	case SIOCDIFADDR_IN6:
734	{
735		struct nd_prefix *pr;
736
737		/*
738		 * If the address being deleted is the only one that owns
739		 * the corresponding prefix, expire the prefix as well.
740		 * XXX: theoretically, we don't have to worry about such
741		 * relationship, since we separate the address management
742		 * and the prefix management.  We do this, however, to provide
743		 * as much backward compatibility as possible in terms of
744		 * the ioctl operation.
745		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
746		 */
747		pr = ia->ia6_ndpr;
748		in6_purgeaddr(&ia->ia_ifa);
749		if (pr && pr->ndpr_refcnt == 0)
750			prelist_remove(pr);
751		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
752		break;
753	}
754
755	default:
756		if (ifp->if_ioctl == NULL) {
757			error = EOPNOTSUPP;
758			goto out;
759		}
760		error = (*ifp->if_ioctl)(ifp, cmd, data);
761		goto out;
762	}
763
764	error = 0;
765out:
766	if (ia != NULL)
767		ifa_free(&ia->ia_ifa);
768	return (error);
769}
770
771
772/*
773 * Join necessary multicast groups.  Factored out from in6_update_ifa().
774 * This entire work should only be done once, for the default FIB.
775 */
776static int
777in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
778    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
779{
780	char ip6buf[INET6_ADDRSTRLEN];
781	struct in6_addr mltaddr;
782	struct in6_multi_mship *imm;
783	int delay, error;
784
785	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
786
787	/* Join solicited multicast addr for new host id. */
788	bzero(&mltaddr, sizeof(struct in6_addr));
789	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
790	mltaddr.s6_addr32[2] = htonl(1);
791	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
792	mltaddr.s6_addr8[12] = 0xff;
793	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
794		/* XXX: should not happen */
795		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
796		goto cleanup;
797	}
798	delay = error = 0;
799	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
800		/*
801		 * We need a random delay for DAD on the address being
802		 * configured.  It also means delaying transmission of the
803		 * corresponding MLD report to avoid report collision.
804		 * [RFC 4861, Section 6.3.7]
805		 */
806		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
807	}
808	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
809	if (imm == NULL) {
810		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
811		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
812		    if_name(ifp), error));
813		goto cleanup;
814	}
815	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816	*in6m_sol = imm->i6mm_maddr;
817
818	/*
819	 * Join link-local all-nodes address.
820	 */
821	mltaddr = in6addr_linklocal_allnodes;
822	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
823		goto cleanup; /* XXX: should not fail */
824
825	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
826	if (imm == NULL) {
827		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
828		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
829		    if_name(ifp), error));
830		goto cleanup;
831	}
832	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
833
834	/*
835	 * Join node information group address.
836	 */
837	delay = 0;
838	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
839		/*
840		 * The spec does not say anything about delay for this group,
841		 * but the same logic should apply.
842		 */
843		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
844	}
845	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
846		/* XXX jinmei */
847		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
848		if (imm == NULL)
849			nd6log((LOG_WARNING,
850			    "%s: in6_joingroup failed for %s on %s "
851			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
852			    &mltaddr), if_name(ifp), error));
853			/* XXX not very fatal, go on... */
854		else
855			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
856	}
857	if (V_icmp6_nodeinfo_oldmcprefix &&
858	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
859		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
860		if (imm == NULL)
861			nd6log((LOG_WARNING,
862			    "%s: in6_joingroup failed for %s on %s "
863			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
864			    &mltaddr), if_name(ifp), error));
865			/* XXX not very fatal, go on... */
866		else
867			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
868	}
869
870	/*
871	 * Join interface-local all-nodes address.
872	 * (ff01::1%ifN, and ff01::%ifN/32)
873	 */
874	mltaddr = in6addr_nodelocal_allnodes;
875	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
876		goto cleanup; /* XXX: should not fail */
877
878	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
879	if (imm == NULL) {
880		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
881		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
882		    &mltaddr), if_name(ifp), error));
883		goto cleanup;
884	}
885	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
886
887cleanup:
888	return (error);
889}
890
891/*
892 * Update parameters of an IPv6 interface address.
893 * If necessary, a new entry is created and linked into address chains.
894 * This function is separated from in6_control().
895 */
896int
897in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
898    struct in6_ifaddr *ia, int flags)
899{
900	int error, hostIsNew = 0;
901
902	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
903		return (error);
904
905	if (ia == NULL) {
906		hostIsNew = 1;
907		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
908			return (ENOBUFS);
909	}
910
911	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
912	if (error != 0) {
913		if (hostIsNew != 0) {
914			in6_unlink_ifa(ia, ifp);
915			ifa_free(&ia->ia_ifa);
916		}
917		return (error);
918	}
919
920	if (hostIsNew)
921		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
922
923	return (error);
924}
925
926/*
927 * Fill in basic IPv6 address request info.
928 */
929void
930in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
931    const struct in6_addr *mask)
932{
933
934	memset(ifra, 0, sizeof(struct in6_aliasreq));
935
936	ifra->ifra_addr.sin6_family = AF_INET6;
937	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
938	if (addr != NULL)
939		ifra->ifra_addr.sin6_addr = *addr;
940
941	ifra->ifra_prefixmask.sin6_family = AF_INET6;
942	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
943	if (mask != NULL)
944		ifra->ifra_prefixmask.sin6_addr = *mask;
945}
946
947static int
948in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
949    struct in6_ifaddr *ia, int flags)
950{
951	int plen = -1;
952	struct sockaddr_in6 dst6;
953	struct in6_addrlifetime *lt;
954	char ip6buf[INET6_ADDRSTRLEN];
955
956	/* Validate parameters */
957	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
958		return (EINVAL);
959
960	/*
961	 * The destination address for a p2p link must have a family
962	 * of AF_UNSPEC or AF_INET6.
963	 */
964	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
965	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
966	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
967		return (EAFNOSUPPORT);
968
969	/*
970	 * Validate address
971	 */
972	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
973	    ifra->ifra_addr.sin6_family != AF_INET6)
974		return (EINVAL);
975
976	/*
977	 * validate ifra_prefixmask.  don't check sin6_family, netmask
978	 * does not carry fields other than sin6_len.
979	 */
980	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
981		return (EINVAL);
982	/*
983	 * Because the IPv6 address architecture is classless, we require
984	 * users to specify a (non 0) prefix length (mask) for a new address.
985	 * We also require the prefix (when specified) mask is valid, and thus
986	 * reject a non-consecutive mask.
987	 */
988	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
989		return (EINVAL);
990	if (ifra->ifra_prefixmask.sin6_len != 0) {
991		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
992		    (u_char *)&ifra->ifra_prefixmask +
993		    ifra->ifra_prefixmask.sin6_len);
994		if (plen <= 0)
995			return (EINVAL);
996	} else {
997		/*
998		 * In this case, ia must not be NULL.  We just use its prefix
999		 * length.
1000		 */
1001		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1002	}
1003	/*
1004	 * If the destination address on a p2p interface is specified,
1005	 * and the address is a scoped one, validate/set the scope
1006	 * zone identifier.
1007	 */
1008	dst6 = ifra->ifra_dstaddr;
1009	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1010	    (dst6.sin6_family == AF_INET6)) {
1011		struct in6_addr in6_tmp;
1012		u_int32_t zoneid;
1013
1014		in6_tmp = dst6.sin6_addr;
1015		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1016			return (EINVAL); /* XXX: should be impossible */
1017
1018		if (dst6.sin6_scope_id != 0) {
1019			if (dst6.sin6_scope_id != zoneid)
1020				return (EINVAL);
1021		} else		/* user omit to specify the ID. */
1022			dst6.sin6_scope_id = zoneid;
1023
1024		/* convert into the internal form */
1025		if (sa6_embedscope(&dst6, 0))
1026			return (EINVAL); /* XXX: should be impossible */
1027	}
1028	/* Modify original ifra_dstaddr to reflect changes */
1029	ifra->ifra_dstaddr = dst6;
1030
1031	/*
1032	 * The destination address can be specified only for a p2p or a
1033	 * loopback interface.  If specified, the corresponding prefix length
1034	 * must be 128.
1035	 */
1036	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1037		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1038			/* XXX: noisy message */
1039			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1040			    "be specified for a p2p or a loopback IF only\n"));
1041			return (EINVAL);
1042		}
1043		if (plen != 128) {
1044			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1045			    "be 128 when dstaddr is specified\n"));
1046			return (EINVAL);
1047		}
1048	}
1049	/* lifetime consistency check */
1050	lt = &ifra->ifra_lifetime;
1051	if (lt->ia6t_pltime > lt->ia6t_vltime)
1052		return (EINVAL);
1053	if (lt->ia6t_vltime == 0) {
1054		/*
1055		 * the following log might be noisy, but this is a typical
1056		 * configuration mistake or a tool's bug.
1057		 */
1058		nd6log((LOG_INFO,
1059		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1060		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1061
1062		if (ia == NULL)
1063			return (0); /* there's nothing to do */
1064	}
1065
1066	/* Check prefix mask */
1067	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1068		/*
1069		 * We prohibit changing the prefix length of an existing
1070		 * address, because
1071		 * + such an operation should be rare in IPv6, and
1072		 * + the operation would confuse prefix management.
1073		 */
1074		if (ia->ia_prefixmask.sin6_len != 0 &&
1075		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1076			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1077			    "of an existing %s address should not be changed\n",
1078			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1079
1080			return (EINVAL);
1081		}
1082	}
1083
1084	return (0);
1085}
1086
1087
1088/*
1089 * Allocate a new ifaddr and link it into chains.
1090 */
1091static struct in6_ifaddr *
1092in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1093{
1094	struct in6_ifaddr *ia;
1095
1096	/*
1097	 * When in6_alloc_ifa() is called in a process of a received
1098	 * RA, it is called under an interrupt context.  So, we should
1099	 * call malloc with M_NOWAIT.
1100	 */
1101	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1102	if (ia == NULL)
1103		return (NULL);
1104	LIST_INIT(&ia->ia6_memberships);
1105	/* Initialize the address and masks, and put time stamp */
1106	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1107	ia->ia_addr.sin6_family = AF_INET6;
1108	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1109	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1110	ia->ia_addr = ifra->ifra_addr;
1111	ia->ia6_createtime = time_uptime;
1112	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1113		/*
1114		 * Some functions expect that ifa_dstaddr is not
1115		 * NULL for p2p interfaces.
1116		 */
1117		ia->ia_ifa.ifa_dstaddr =
1118		    (struct sockaddr *)&ia->ia_dstaddr;
1119	} else {
1120		ia->ia_ifa.ifa_dstaddr = NULL;
1121	}
1122
1123	/* set prefix mask if any */
1124	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1125	if (ifra->ifra_prefixmask.sin6_len != 0) {
1126		ia->ia_prefixmask.sin6_family = AF_INET6;
1127		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1128		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1129	}
1130
1131	ia->ia_ifp = ifp;
1132	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1133	IF_ADDR_WLOCK(ifp);
1134	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1135	IF_ADDR_WUNLOCK(ifp);
1136
1137	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1138	IN6_IFADDR_WLOCK();
1139	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1140	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1141	IN6_IFADDR_WUNLOCK();
1142
1143	return (ia);
1144}
1145
1146/*
1147 * Update/configure interface address parameters:
1148 *
1149 * 1) Update lifetime
1150 * 2) Update interface metric ad flags
1151 * 3) Notify other subsystems
1152 */
1153static int
1154in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1155    struct in6_ifaddr *ia, int hostIsNew, int flags)
1156{
1157	int error;
1158
1159	/* update timestamp */
1160	ia->ia6_updatetime = time_uptime;
1161
1162	/*
1163	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1164	 * to see if the address is deprecated or invalidated, but initialize
1165	 * these members for applications.
1166	 */
1167	ia->ia6_lifetime = ifra->ifra_lifetime;
1168	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1169		ia->ia6_lifetime.ia6t_expire =
1170		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1171	} else
1172		ia->ia6_lifetime.ia6t_expire = 0;
1173	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1174		ia->ia6_lifetime.ia6t_preferred =
1175		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1176	} else
1177		ia->ia6_lifetime.ia6t_preferred = 0;
1178
1179	/*
1180	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1181	 * userland, make it deprecated.
1182	 */
1183	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1184		ia->ia6_lifetime.ia6t_pltime = 0;
1185		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1186	}
1187
1188	/*
1189	 * configure address flags.
1190	 */
1191	ia->ia6_flags = ifra->ifra_flags;
1192
1193	/*
1194	 * Make the address tentative before joining multicast addresses,
1195	 * so that corresponding MLD responses would not have a tentative
1196	 * source address.
1197	 */
1198	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1199
1200	/*
1201	 * DAD should be performed for an new address or addresses on
1202	 * an interface with ND6_IFF_IFDISABLED.
1203	 */
1204	if (in6if_do_dad(ifp) &&
1205	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1206		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1207
1208	/* notify other subsystems */
1209	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1210
1211	return (error);
1212}
1213
1214/*
1215 * Do link-level ifa job:
1216 * 1) Add lle entry for added address
1217 * 2) Notifies routing socket users about new address
1218 * 3) join appropriate multicast group
1219 * 4) start DAD if enabled
1220 */
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	/* Leave multicast groups. */
1311	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1312		LIST_REMOVE(imm, i6mm_chain);
1313		in6_leavegroup(imm);
1314	}
1315	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1316	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1317		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1318		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1319		if (error != 0)
1320			log(LOG_INFO, "%s: err=%d, destination address delete "
1321			    "failed\n", __func__, error);
1322		ia->ia_flags &= ~IFA_ROUTE;
1323	}
1324
1325	in6_newaddrmsg(ia, RTM_DELETE);
1326	in6_unlink_ifa(ia, ifp);
1327}
1328
1329static void
1330in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1331{
1332	char ip6buf[INET6_ADDRSTRLEN];
1333	int remove_lle;
1334
1335	IF_ADDR_WLOCK(ifp);
1336	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1337	IF_ADDR_WUNLOCK(ifp);
1338	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1339
1340	/*
1341	 * Defer the release of what might be the last reference to the
1342	 * in6_ifaddr so that it can't be freed before the remainder of the
1343	 * cleanup.
1344	 */
1345	IN6_IFADDR_WLOCK();
1346	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1347	LIST_REMOVE(ia, ia6_hash);
1348	IN6_IFADDR_WUNLOCK();
1349
1350	/*
1351	 * Release the reference to the base prefix.  There should be a
1352	 * positive reference.
1353	 */
1354	remove_lle = 0;
1355	if (ia->ia6_ndpr == NULL) {
1356		nd6log((LOG_NOTICE,
1357		    "in6_unlink_ifa: autoconf'ed address "
1358		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1359	} else {
1360		ia->ia6_ndpr->ndpr_refcnt--;
1361		/* Do not delete lles within prefix if refcont != 0 */
1362		if (ia->ia6_ndpr->ndpr_refcnt == 0)
1363			remove_lle = 1;
1364		ia->ia6_ndpr = NULL;
1365	}
1366
1367	nd6_rem_ifa_lle(ia, remove_lle);
1368
1369	/*
1370	 * Also, if the address being removed is autoconf'ed, call
1371	 * pfxlist_onlink_check() since the release might affect the status of
1372	 * other (detached) addresses.
1373	 */
1374	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1375		pfxlist_onlink_check();
1376	}
1377	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1378}
1379
1380/*
1381 * Notifies other subsystems about address change/arrival:
1382 * 1) Notifies device handler on the first IPv6 address assignment
1383 * 2) Handle routing table changes for P2P links and route
1384 * 3) Handle routing table changes for address host route
1385 */
1386static int
1387in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1388    struct in6_aliasreq *ifra, int hostIsNew)
1389{
1390	int	error = 0, plen, ifacount = 0;
1391	struct ifaddr *ifa;
1392	struct sockaddr_in6 *pdst;
1393	char ip6buf[INET6_ADDRSTRLEN];
1394
1395	/*
1396	 * Give the interface a chance to initialize
1397	 * if this is its first address,
1398	 */
1399	if (hostIsNew != 0) {
1400		IF_ADDR_RLOCK(ifp);
1401		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1402			if (ifa->ifa_addr->sa_family != AF_INET6)
1403				continue;
1404			ifacount++;
1405		}
1406		IF_ADDR_RUNLOCK(ifp);
1407	}
1408
1409	if (ifacount <= 1 && ifp->if_ioctl) {
1410		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1411		if (error)
1412			return (error);
1413	}
1414
1415	/*
1416	 * If a new destination address is specified, scrub the old one and
1417	 * install the new destination.  Note that the interface must be
1418	 * p2p or loopback.
1419	 */
1420	pdst = &ifra->ifra_dstaddr;
1421	if (pdst->sin6_family == AF_INET6 &&
1422	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1423		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1424		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1425			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1426			    "remove a route to the old destination: %s\n",
1427			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1428			/* proceed anyway... */
1429		} else
1430			ia->ia_flags &= ~IFA_ROUTE;
1431		ia->ia_dstaddr = *pdst;
1432	}
1433
1434	/*
1435	 * If a new destination address is specified for a point-to-point
1436	 * interface, install a route to the destination as an interface
1437	 * direct route.
1438	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1439	 * interface that share the same destination.
1440	 */
1441	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1442	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1443	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1444		int rtflags = RTF_UP | RTF_HOST;
1445		/*
1446		 * Handle the case for ::1 .
1447		 */
1448		if (ifp->if_flags & IFF_LOOPBACK)
1449			ia->ia_flags |= IFA_RTSELF;
1450		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1451		if (error)
1452			return (error);
1453		ia->ia_flags |= IFA_ROUTE;
1454	}
1455
1456	/*
1457	 * add a loopback route to self if not exists
1458	 */
1459	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1460		error = ifa_add_loopback_route((struct ifaddr *)ia,
1461		    (struct sockaddr *)&ia->ia_addr);
1462		if (error == 0)
1463			ia->ia_flags |= IFA_RTSELF;
1464	}
1465
1466	return (error);
1467}
1468
1469/*
1470 * Find an IPv6 interface link-local address specific to an interface.
1471 * ifaddr is returned referenced.
1472 */
1473struct in6_ifaddr *
1474in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1475{
1476	struct ifaddr *ifa;
1477
1478	IF_ADDR_RLOCK(ifp);
1479	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1480		if (ifa->ifa_addr->sa_family != AF_INET6)
1481			continue;
1482		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1483			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1484			    ignoreflags) != 0)
1485				continue;
1486			ifa_ref(ifa);
1487			break;
1488		}
1489	}
1490	IF_ADDR_RUNLOCK(ifp);
1491
1492	return ((struct in6_ifaddr *)ifa);
1493}
1494
1495
1496/*
1497 * find the internet address corresponding to a given address.
1498 * ifaddr is returned referenced.
1499 */
1500struct in6_ifaddr *
1501in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1502{
1503	struct rm_priotracker in6_ifa_tracker;
1504	struct in6_ifaddr *ia;
1505
1506	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1507	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1508		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1509			if (zoneid != 0 &&
1510			    zoneid != ia->ia_addr.sin6_scope_id)
1511				continue;
1512			ifa_ref(&ia->ia_ifa);
1513			break;
1514		}
1515	}
1516	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1517	return (ia);
1518}
1519
1520/*
1521 * find the internet address corresponding to a given interface and address.
1522 * ifaddr is returned referenced.
1523 */
1524struct in6_ifaddr *
1525in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1526{
1527	struct ifaddr *ifa;
1528
1529	IF_ADDR_RLOCK(ifp);
1530	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1531		if (ifa->ifa_addr->sa_family != AF_INET6)
1532			continue;
1533		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1534			ifa_ref(ifa);
1535			break;
1536		}
1537	}
1538	IF_ADDR_RUNLOCK(ifp);
1539
1540	return ((struct in6_ifaddr *)ifa);
1541}
1542
1543/*
1544 * Find a link-local scoped address on ifp and return it if any.
1545 */
1546struct in6_ifaddr *
1547in6ifa_llaonifp(struct ifnet *ifp)
1548{
1549	struct sockaddr_in6 *sin6;
1550	struct ifaddr *ifa;
1551
1552	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1553		return (NULL);
1554	if_addr_rlock(ifp);
1555	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1556		if (ifa->ifa_addr->sa_family != AF_INET6)
1557			continue;
1558		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1559		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1560		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1561		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1562			break;
1563	}
1564	if_addr_runlock(ifp);
1565
1566	return ((struct in6_ifaddr *)ifa);
1567}
1568
1569/*
1570 * Convert IP6 address to printable (loggable) representation. Caller
1571 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1572 */
1573static char digits[] = "0123456789abcdef";
1574char *
1575ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1576{
1577	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1578	char *cp;
1579	const u_int16_t *a = (const u_int16_t *)addr;
1580	const u_int8_t *d;
1581	int dcolon = 0, zero = 0;
1582
1583	cp = ip6buf;
1584
1585	for (i = 0; i < 8; i++) {
1586		if (*(a + i) == 0) {
1587			cnt++;
1588			if (cnt == 1)
1589				idx = i;
1590		}
1591		else if (maxcnt < cnt) {
1592			maxcnt = cnt;
1593			index = idx;
1594			cnt = 0;
1595		}
1596	}
1597	if (maxcnt < cnt) {
1598		maxcnt = cnt;
1599		index = idx;
1600	}
1601
1602	for (i = 0; i < 8; i++) {
1603		if (dcolon == 1) {
1604			if (*a == 0) {
1605				if (i == 7)
1606					*cp++ = ':';
1607				a++;
1608				continue;
1609			} else
1610				dcolon = 2;
1611		}
1612		if (*a == 0) {
1613			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1614				if (i == 0)
1615					*cp++ = ':';
1616				*cp++ = ':';
1617				dcolon = 1;
1618			} else {
1619				*cp++ = '0';
1620				*cp++ = ':';
1621			}
1622			a++;
1623			continue;
1624		}
1625		d = (const u_char *)a;
1626		/* Try to eliminate leading zeros in printout like in :0001. */
1627		zero = 1;
1628		*cp = digits[*d >> 4];
1629		if (*cp != '0') {
1630			zero = 0;
1631			cp++;
1632		}
1633		*cp = digits[*d++ & 0xf];
1634		if (zero == 0 || (*cp != '0')) {
1635			zero = 0;
1636			cp++;
1637		}
1638		*cp = digits[*d >> 4];
1639		if (zero == 0 || (*cp != '0')) {
1640			zero = 0;
1641			cp++;
1642		}
1643		*cp++ = digits[*d & 0xf];
1644		*cp++ = ':';
1645		a++;
1646	}
1647	*--cp = '\0';
1648	return (ip6buf);
1649}
1650
1651int
1652in6_localaddr(struct in6_addr *in6)
1653{
1654	struct rm_priotracker in6_ifa_tracker;
1655	struct in6_ifaddr *ia;
1656
1657	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1658		return 1;
1659
1660	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1661	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1662		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1663		    &ia->ia_prefixmask.sin6_addr)) {
1664			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1665			return 1;
1666		}
1667	}
1668	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1669
1670	return (0);
1671}
1672
1673/*
1674 * Return 1 if an internet address is for the local host and configured
1675 * on one of its interfaces.
1676 */
1677int
1678in6_localip(struct in6_addr *in6)
1679{
1680	struct rm_priotracker in6_ifa_tracker;
1681	struct in6_ifaddr *ia;
1682
1683	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1684	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1685		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1686			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1687			return (1);
1688		}
1689	}
1690	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1691	return (0);
1692}
1693
1694/*
1695 * Return 1 if an internet address is configured on an interface.
1696 */
1697int
1698in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1699{
1700	struct in6_addr in6;
1701	struct ifaddr *ifa;
1702	struct in6_ifaddr *ia6;
1703
1704	in6 = *addr;
1705	if (in6_clearscope(&in6))
1706		return (0);
1707	in6_setscope(&in6, ifp, NULL);
1708
1709	IF_ADDR_RLOCK(ifp);
1710	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1711		if (ifa->ifa_addr->sa_family != AF_INET6)
1712			continue;
1713		ia6 = (struct in6_ifaddr *)ifa;
1714		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1715			IF_ADDR_RUNLOCK(ifp);
1716			return (1);
1717		}
1718	}
1719	IF_ADDR_RUNLOCK(ifp);
1720
1721	return (0);
1722}
1723
1724int
1725in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1726{
1727	struct rm_priotracker in6_ifa_tracker;
1728	struct in6_ifaddr *ia;
1729
1730	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1731	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1732		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1733			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1734				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1735				return (1); /* true */
1736			}
1737			break;
1738		}
1739	}
1740	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1741
1742	return (0);		/* false */
1743}
1744
1745/*
1746 * return length of part which dst and src are equal
1747 * hard coding...
1748 */
1749int
1750in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1751{
1752	int match = 0;
1753	u_char *s = (u_char *)src, *d = (u_char *)dst;
1754	u_char *lim = s + 16, r;
1755
1756	while (s < lim)
1757		if ((r = (*d++ ^ *s++)) != 0) {
1758			while (r < 128) {
1759				match++;
1760				r <<= 1;
1761			}
1762			break;
1763		} else
1764			match += 8;
1765	return match;
1766}
1767
1768/* XXX: to be scope conscious */
1769int
1770in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1771{
1772	int bytelen, bitlen;
1773
1774	/* sanity check */
1775	if (0 > len || len > 128) {
1776		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1777		    len);
1778		return (0);
1779	}
1780
1781	bytelen = len / 8;
1782	bitlen = len % 8;
1783
1784	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1785		return (0);
1786	if (bitlen != 0 &&
1787	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1788	    p2->s6_addr[bytelen] >> (8 - bitlen))
1789		return (0);
1790
1791	return (1);
1792}
1793
1794void
1795in6_prefixlen2mask(struct in6_addr *maskp, int len)
1796{
1797	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1798	int bytelen, bitlen, i;
1799
1800	/* sanity check */
1801	if (0 > len || len > 128) {
1802		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1803		    len);
1804		return;
1805	}
1806
1807	bzero(maskp, sizeof(*maskp));
1808	bytelen = len / 8;
1809	bitlen = len % 8;
1810	for (i = 0; i < bytelen; i++)
1811		maskp->s6_addr[i] = 0xff;
1812	if (bitlen)
1813		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1814}
1815
1816/*
1817 * return the best address out of the same scope. if no address was
1818 * found, return the first valid address from designated IF.
1819 */
1820struct in6_ifaddr *
1821in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1822{
1823	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1824	struct ifaddr *ifa;
1825	struct in6_ifaddr *besta = 0;
1826	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1827
1828	dep[0] = dep[1] = NULL;
1829
1830	/*
1831	 * We first look for addresses in the same scope.
1832	 * If there is one, return it.
1833	 * If two or more, return one which matches the dst longest.
1834	 * If none, return one of global addresses assigned other ifs.
1835	 */
1836	IF_ADDR_RLOCK(ifp);
1837	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1838		if (ifa->ifa_addr->sa_family != AF_INET6)
1839			continue;
1840		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1841			continue; /* XXX: is there any case to allow anycast? */
1842		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1843			continue; /* don't use this interface */
1844		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1845			continue;
1846		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1847			if (V_ip6_use_deprecated)
1848				dep[0] = (struct in6_ifaddr *)ifa;
1849			continue;
1850		}
1851
1852		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1853			/*
1854			 * call in6_matchlen() as few as possible
1855			 */
1856			if (besta) {
1857				if (blen == -1)
1858					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1859				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1860				if (tlen > blen) {
1861					blen = tlen;
1862					besta = (struct in6_ifaddr *)ifa;
1863				}
1864			} else
1865				besta = (struct in6_ifaddr *)ifa;
1866		}
1867	}
1868	if (besta) {
1869		ifa_ref(&besta->ia_ifa);
1870		IF_ADDR_RUNLOCK(ifp);
1871		return (besta);
1872	}
1873
1874	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1875		if (ifa->ifa_addr->sa_family != AF_INET6)
1876			continue;
1877		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1878			continue; /* XXX: is there any case to allow anycast? */
1879		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1880			continue; /* don't use this interface */
1881		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1882			continue;
1883		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1884			if (V_ip6_use_deprecated)
1885				dep[1] = (struct in6_ifaddr *)ifa;
1886			continue;
1887		}
1888
1889		if (ifa != NULL)
1890			ifa_ref(ifa);
1891		IF_ADDR_RUNLOCK(ifp);
1892		return (struct in6_ifaddr *)ifa;
1893	}
1894
1895	/* use the last-resort values, that are, deprecated addresses */
1896	if (dep[0]) {
1897		ifa_ref((struct ifaddr *)dep[0]);
1898		IF_ADDR_RUNLOCK(ifp);
1899		return dep[0];
1900	}
1901	if (dep[1]) {
1902		ifa_ref((struct ifaddr *)dep[1]);
1903		IF_ADDR_RUNLOCK(ifp);
1904		return dep[1];
1905	}
1906
1907	IF_ADDR_RUNLOCK(ifp);
1908	return NULL;
1909}
1910
1911/*
1912 * perform DAD when interface becomes IFF_UP.
1913 */
1914void
1915in6_if_up(struct ifnet *ifp)
1916{
1917	struct ifaddr *ifa;
1918	struct in6_ifaddr *ia;
1919
1920	IF_ADDR_RLOCK(ifp);
1921	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1922		if (ifa->ifa_addr->sa_family != AF_INET6)
1923			continue;
1924		ia = (struct in6_ifaddr *)ifa;
1925		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1926			/*
1927			 * The TENTATIVE flag was likely set by hand
1928			 * beforehand, implicitly indicating the need for DAD.
1929			 * We may be able to skip the random delay in this
1930			 * case, but we impose delays just in case.
1931			 */
1932			nd6_dad_start(ifa,
1933			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1934		}
1935	}
1936	IF_ADDR_RUNLOCK(ifp);
1937
1938	/*
1939	 * special cases, like 6to4, are handled in in6_ifattach
1940	 */
1941	in6_ifattach(ifp, NULL);
1942}
1943
1944int
1945in6if_do_dad(struct ifnet *ifp)
1946{
1947	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1948		return (0);
1949
1950	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1951	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1952		return (0);
1953
1954	/*
1955	 * Our DAD routine requires the interface up and running.
1956	 * However, some interfaces can be up before the RUNNING
1957	 * status.  Additionaly, users may try to assign addresses
1958	 * before the interface becomes up (or running).
1959	 * This function returns EAGAIN in that case.
1960	 * The caller should mark "tentative" on the address instead of
1961	 * performing DAD immediately.
1962	 */
1963	if (!((ifp->if_flags & IFF_UP) &&
1964	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1965		return (EAGAIN);
1966
1967	return (1);
1968}
1969
1970/*
1971 * Calculate max IPv6 MTU through all the interfaces and store it
1972 * to in6_maxmtu.
1973 */
1974void
1975in6_setmaxmtu(void)
1976{
1977	unsigned long maxmtu = 0;
1978	struct ifnet *ifp;
1979
1980	IFNET_RLOCK_NOSLEEP();
1981	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1982		/* this function can be called during ifnet initialization */
1983		if (!ifp->if_afdata[AF_INET6])
1984			continue;
1985		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1986		    IN6_LINKMTU(ifp) > maxmtu)
1987			maxmtu = IN6_LINKMTU(ifp);
1988	}
1989	IFNET_RUNLOCK_NOSLEEP();
1990	if (maxmtu)	/* update only when maxmtu is positive */
1991		V_in6_maxmtu = maxmtu;
1992}
1993
1994/*
1995 * Provide the length of interface identifiers to be used for the link attached
1996 * to the given interface.  The length should be defined in "IPv6 over
1997 * xxx-link" document.  Note that address architecture might also define
1998 * the length for a particular set of address prefixes, regardless of the
1999 * link type.  As clarified in rfc2462bis, those two definitions should be
2000 * consistent, and those really are as of August 2004.
2001 */
2002int
2003in6_if2idlen(struct ifnet *ifp)
2004{
2005	switch (ifp->if_type) {
2006	case IFT_ETHER:		/* RFC2464 */
2007	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2008	case IFT_L2VLAN:	/* ditto */
2009	case IFT_IEEE80211:	/* ditto */
2010	case IFT_INFINIBAND:
2011		return (64);
2012	case IFT_FDDI:		/* RFC2467 */
2013		return (64);
2014	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2015		return (64);
2016	case IFT_PPP:		/* RFC2472 */
2017		return (64);
2018	case IFT_ARCNET:	/* RFC2497 */
2019		return (64);
2020	case IFT_FRELAY:	/* RFC2590 */
2021		return (64);
2022	case IFT_IEEE1394:	/* RFC3146 */
2023		return (64);
2024	case IFT_GIF:
2025		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2026	case IFT_LOOP:
2027		return (64);	/* XXX: is this really correct? */
2028	default:
2029		/*
2030		 * Unknown link type:
2031		 * It might be controversial to use the today's common constant
2032		 * of 64 for these cases unconditionally.  For full compliance,
2033		 * we should return an error in this case.  On the other hand,
2034		 * if we simply miss the standard for the link type or a new
2035		 * standard is defined for a new link type, the IFID length
2036		 * is very likely to be the common constant.  As a compromise,
2037		 * we always use the constant, but make an explicit notice
2038		 * indicating the "unknown" case.
2039		 */
2040		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2041		return (64);
2042	}
2043}
2044
2045#include <sys/sysctl.h>
2046
2047struct in6_llentry {
2048	struct llentry		base;
2049};
2050
2051#define	IN6_LLTBL_DEFAULT_HSIZE	32
2052#define	IN6_LLTBL_HASH(k, h) \
2053	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2054
2055/*
2056 * Do actual deallocation of @lle.
2057 * Called by LLE_FREE_LOCKED when number of references
2058 * drops to zero.
2059 */
2060static void
2061in6_lltable_destroy_lle(struct llentry *lle)
2062{
2063
2064	LLE_WUNLOCK(lle);
2065	LLE_LOCK_DESTROY(lle);
2066	free(lle, M_LLTABLE);
2067}
2068
2069static struct llentry *
2070in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2071{
2072	struct in6_llentry *lle;
2073
2074	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2075	if (lle == NULL)		/* NB: caller generates msg */
2076		return NULL;
2077
2078	lle->base.r_l3addr.addr6 = *addr6;
2079	lle->base.lle_refcnt = 1;
2080	lle->base.lle_free = in6_lltable_destroy_lle;
2081	LLE_LOCK_INIT(&lle->base);
2082	callout_init(&lle->base.lle_timer, 1);
2083
2084	return (&lle->base);
2085}
2086
2087static int
2088in6_lltable_match_prefix(const struct sockaddr *saddr,
2089    const struct sockaddr *smask, u_int flags, struct llentry *lle)
2090{
2091	const struct in6_addr *addr, *mask, *lle_addr;
2092
2093	addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2094	mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2095	lle_addr = &lle->r_l3addr.addr6;
2096
2097	if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2098		return (0);
2099
2100	if (lle->la_flags & LLE_IFADDR) {
2101
2102		/*
2103		 * Delete LLE_IFADDR records IFF address & flag matches.
2104		 * Note that addr is the interface address within prefix
2105		 * being matched.
2106		 */
2107		if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2108		    (flags & LLE_STATIC) != 0)
2109			return (1);
2110		return (0);
2111	}
2112
2113	/* flags & LLE_STATIC means deleting both dynamic and static entries */
2114	if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2115		return (1);
2116
2117	return (0);
2118}
2119
2120static void
2121in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2122{
2123	struct ifnet *ifp;
2124
2125	LLE_WLOCK_ASSERT(lle);
2126	KASSERT(llt != NULL, ("lltable is NULL"));
2127
2128	/* Unlink entry from table */
2129	if ((lle->la_flags & LLE_LINKED) != 0) {
2130
2131		ifp = llt->llt_ifp;
2132		IF_AFDATA_WLOCK_ASSERT(ifp);
2133		lltable_unlink_entry(llt, lle);
2134	}
2135
2136	if (callout_stop(&lle->lle_timer) > 0)
2137		LLE_REMREF(lle);
2138
2139	llentry_free(lle);
2140}
2141
2142static int
2143in6_lltable_rtcheck(struct ifnet *ifp,
2144		    u_int flags,
2145		    const struct sockaddr *l3addr)
2146{
2147	struct rtentry *rt;
2148	char ip6buf[INET6_ADDRSTRLEN];
2149
2150	KASSERT(l3addr->sa_family == AF_INET6,
2151	    ("sin_family %d", l3addr->sa_family));
2152
2153	/* Our local addresses are always only installed on the default FIB. */
2154	/* XXX rtalloc1 should take a const param */
2155	rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2156	    RT_DEFAULT_FIB);
2157	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2158		struct ifaddr *ifa;
2159		/*
2160		 * Create an ND6 cache for an IPv6 neighbor
2161		 * that is not covered by our own prefix.
2162		 */
2163		ifa = ifaof_ifpforaddr(l3addr, ifp);
2164		if (ifa != NULL) {
2165			ifa_free(ifa);
2166			if (rt != NULL)
2167				RTFREE_LOCKED(rt);
2168			return 0;
2169		}
2170		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2171		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2172		if (rt != NULL)
2173			RTFREE_LOCKED(rt);
2174		return EINVAL;
2175	}
2176	RTFREE_LOCKED(rt);
2177	return 0;
2178}
2179
2180static inline uint32_t
2181in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2182{
2183
2184	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2185}
2186
2187static uint32_t
2188in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2189{
2190
2191	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2192}
2193
2194static void
2195in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2196{
2197	struct sockaddr_in6 *sin6;
2198
2199	sin6 = (struct sockaddr_in6 *)sa;
2200	bzero(sin6, sizeof(*sin6));
2201	sin6->sin6_family = AF_INET6;
2202	sin6->sin6_len = sizeof(*sin6);
2203	sin6->sin6_addr = lle->r_l3addr.addr6;
2204}
2205
2206static inline struct llentry *
2207in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2208{
2209	struct llentry *lle;
2210	struct llentries *lleh;
2211	u_int hashidx;
2212
2213	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2214	lleh = &llt->lle_head[hashidx];
2215	LIST_FOREACH(lle, lleh, lle_next) {
2216		if (lle->la_flags & LLE_DELETED)
2217			continue;
2218		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2219			break;
2220	}
2221
2222	return (lle);
2223}
2224
2225static void
2226in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2227{
2228
2229	lle->la_flags |= LLE_DELETED;
2230	EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2231#ifdef DIAGNOSTIC
2232	log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2233#endif
2234	llentry_free(lle);
2235}
2236
2237static struct llentry *
2238in6_lltable_alloc(struct lltable *llt, u_int flags,
2239	const struct sockaddr *l3addr)
2240{
2241	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2242	struct ifnet *ifp = llt->llt_ifp;
2243	struct llentry *lle;
2244
2245	KASSERT(l3addr->sa_family == AF_INET6,
2246	    ("sin_family %d", l3addr->sa_family));
2247
2248	/*
2249	 * A route that covers the given address must have
2250	 * been installed 1st because we are doing a resolution,
2251	 * verify this.
2252	 */
2253	if (!(flags & LLE_IFADDR) &&
2254	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2255		return (NULL);
2256
2257	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2258	if (lle == NULL) {
2259		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2260		return (NULL);
2261	}
2262	lle->la_flags = flags;
2263	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2264		lltable_set_entry_addr(ifp, lle, IF_LLADDR(ifp));
2265		lle->la_flags |= LLE_STATIC;
2266	}
2267
2268	if ((lle->la_flags & LLE_STATIC) != 0)
2269		lle->ln_state = ND6_LLINFO_REACHABLE;
2270
2271	return (lle);
2272}
2273
2274static struct llentry *
2275in6_lltable_lookup(struct lltable *llt, u_int flags,
2276	const struct sockaddr *l3addr)
2277{
2278	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2279	struct llentry *lle;
2280
2281	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2282	KASSERT(l3addr->sa_family == AF_INET6,
2283	    ("sin_family %d", l3addr->sa_family));
2284
2285	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2286
2287	if (lle == NULL)
2288		return (NULL);
2289
2290	if (flags & LLE_EXCLUSIVE)
2291		LLE_WLOCK(lle);
2292	else
2293		LLE_RLOCK(lle);
2294	return (lle);
2295}
2296
2297static int
2298in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2299    struct sysctl_req *wr)
2300{
2301	struct ifnet *ifp = llt->llt_ifp;
2302	/* XXX stack use */
2303	struct {
2304		struct rt_msghdr	rtm;
2305		struct sockaddr_in6	sin6;
2306		/*
2307		 * ndp.c assumes that sdl is word aligned
2308		 */
2309#ifdef __LP64__
2310		uint32_t		pad;
2311#endif
2312		struct sockaddr_dl	sdl;
2313	} ndpc;
2314	struct sockaddr_dl *sdl;
2315	int error;
2316
2317	bzero(&ndpc, sizeof(ndpc));
2318			/* skip deleted entries */
2319			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2320				return (0);
2321			/* Skip if jailed and not a valid IP of the prison. */
2322			lltable_fill_sa_entry(lle,
2323			    (struct sockaddr *)&ndpc.sin6);
2324			if (prison_if(wr->td->td_ucred,
2325			    (struct sockaddr *)&ndpc.sin6) != 0)
2326				return (0);
2327			/*
2328			 * produce a msg made of:
2329			 *  struct rt_msghdr;
2330			 *  struct sockaddr_in6 (IPv6)
2331			 *  struct sockaddr_dl;
2332			 */
2333			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2334			ndpc.rtm.rtm_version = RTM_VERSION;
2335			ndpc.rtm.rtm_type = RTM_GET;
2336			ndpc.rtm.rtm_flags = RTF_UP;
2337			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2338			if (V_deembed_scopeid)
2339				sa6_recoverscope(&ndpc.sin6);
2340
2341			/* publish */
2342			if (lle->la_flags & LLE_PUB)
2343				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2344
2345			sdl = &ndpc.sdl;
2346			sdl->sdl_family = AF_LINK;
2347			sdl->sdl_len = sizeof(*sdl);
2348			sdl->sdl_alen = ifp->if_addrlen;
2349			sdl->sdl_index = ifp->if_index;
2350			sdl->sdl_type = ifp->if_type;
2351			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2352			ndpc.rtm.rtm_rmx.rmx_expire =
2353			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2354			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2355			if (lle->la_flags & LLE_STATIC)
2356				ndpc.rtm.rtm_flags |= RTF_STATIC;
2357			if (lle->la_flags & LLE_IFADDR)
2358				ndpc.rtm.rtm_flags |= RTF_PINNED;
2359			ndpc.rtm.rtm_index = ifp->if_index;
2360			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2361
2362	return (error);
2363}
2364
2365static struct lltable *
2366in6_lltattach(struct ifnet *ifp)
2367{
2368	struct lltable *llt;
2369
2370	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2371	llt->llt_af = AF_INET6;
2372	llt->llt_ifp = ifp;
2373
2374	llt->llt_lookup = in6_lltable_lookup;
2375	llt->llt_alloc_entry = in6_lltable_alloc;
2376	llt->llt_delete_entry = in6_lltable_delete_entry;
2377	llt->llt_dump_entry = in6_lltable_dump_entry;
2378	llt->llt_hash = in6_lltable_hash;
2379	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2380	llt->llt_free_entry = in6_lltable_free_entry;
2381	llt->llt_match_prefix = in6_lltable_match_prefix;
2382 	lltable_link(llt);
2383
2384	return (llt);
2385}
2386
2387void *
2388in6_domifattach(struct ifnet *ifp)
2389{
2390	struct in6_ifextra *ext;
2391
2392	/* There are not IPv6-capable interfaces. */
2393	switch (ifp->if_type) {
2394	case IFT_PFLOG:
2395	case IFT_PFSYNC:
2396	case IFT_USB:
2397		return (NULL);
2398	}
2399	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2400	bzero(ext, sizeof(*ext));
2401
2402	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2403	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2404	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2405	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2406
2407	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2408	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2409	    M_WAITOK);
2410	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2411	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2412
2413	ext->nd_ifinfo = nd6_ifattach(ifp);
2414	ext->scope6_id = scope6_ifattach(ifp);
2415	ext->lltable = in6_lltattach(ifp);
2416
2417	ext->mld_ifinfo = mld_domifattach(ifp);
2418
2419	return ext;
2420}
2421
2422int
2423in6_domifmtu(struct ifnet *ifp)
2424{
2425
2426	return (IN6_LINKMTU(ifp));
2427}
2428
2429void
2430in6_domifdetach(struct ifnet *ifp, void *aux)
2431{
2432	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2433
2434	mld_domifdetach(ifp);
2435	scope6_ifdetach(ext->scope6_id);
2436	nd6_ifdetach(ext->nd_ifinfo);
2437	lltable_free(ext->lltable);
2438	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2439	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2440	free(ext->in6_ifstat, M_IFADDR);
2441	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2442	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2443	free(ext->icmp6_ifstat, M_IFADDR);
2444	free(ext, M_IFADDR);
2445}
2446
2447/*
2448 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2449 * v4 mapped addr or v4 compat addr
2450 */
2451void
2452in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2453{
2454
2455	bzero(sin, sizeof(*sin));
2456	sin->sin_len = sizeof(struct sockaddr_in);
2457	sin->sin_family = AF_INET;
2458	sin->sin_port = sin6->sin6_port;
2459	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2460}
2461
2462/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2463void
2464in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2465{
2466	bzero(sin6, sizeof(*sin6));
2467	sin6->sin6_len = sizeof(struct sockaddr_in6);
2468	sin6->sin6_family = AF_INET6;
2469	sin6->sin6_port = sin->sin_port;
2470	sin6->sin6_addr.s6_addr32[0] = 0;
2471	sin6->sin6_addr.s6_addr32[1] = 0;
2472	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2473	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2474}
2475
2476/* Convert sockaddr_in6 into sockaddr_in. */
2477void
2478in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2479{
2480	struct sockaddr_in *sin_p;
2481	struct sockaddr_in6 sin6;
2482
2483	/*
2484	 * Save original sockaddr_in6 addr and convert it
2485	 * to sockaddr_in.
2486	 */
2487	sin6 = *(struct sockaddr_in6 *)nam;
2488	sin_p = (struct sockaddr_in *)nam;
2489	in6_sin6_2_sin(sin_p, &sin6);
2490}
2491
2492/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2493void
2494in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2495{
2496	struct sockaddr_in *sin_p;
2497	struct sockaddr_in6 *sin6_p;
2498
2499	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2500	sin_p = (struct sockaddr_in *)*nam;
2501	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2502	free(*nam, M_SONAME);
2503	*nam = (struct sockaddr *)sin6_p;
2504}
2505