in6.c revision c9a63ac91076d46683777a2be1291add666712d0
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	$KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
32 */
33
34/*-
35 * Copyright (c) 1982, 1986, 1991, 1993
36 *	The Regents of the University of California.  All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 *    notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 *    notice, this list of conditions and the following disclaimer in the
45 *    documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 *    may be used to endorse or promote products derived from this software
48 *    without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 *	@(#)in.c	8.2 (Berkeley) 11/15/93
63 */
64
65#include <sys/cdefs.h>
66__FBSDID("$FreeBSD$");
67
68#include "opt_compat.h"
69#include "opt_inet.h"
70#include "opt_inet6.h"
71
72#include <sys/param.h>
73#include <sys/eventhandler.h>
74#include <sys/errno.h>
75#include <sys/jail.h>
76#include <sys/malloc.h>
77#include <sys/socket.h>
78#include <sys/socketvar.h>
79#include <sys/sockio.h>
80#include <sys/systm.h>
81#include <sys/priv.h>
82#include <sys/proc.h>
83#include <sys/time.h>
84#include <sys/kernel.h>
85#include <sys/lock.h>
86#include <sys/rmlock.h>
87#include <sys/syslog.h>
88
89#include <net/if.h>
90#include <net/if_var.h>
91#include <net/if_types.h>
92#include <net/route.h>
93#include <net/if_dl.h>
94#include <net/vnet.h>
95
96#include <netinet/in.h>
97#include <netinet/in_var.h>
98#include <net/if_llatbl.h>
99#include <netinet/if_ether.h>
100#include <netinet/in_systm.h>
101#include <netinet/ip.h>
102#include <netinet/in_pcb.h>
103#include <netinet/ip_carp.h>
104
105#include <netinet/ip6.h>
106#include <netinet6/ip6_var.h>
107#include <netinet6/nd6.h>
108#include <netinet6/mld6_var.h>
109#include <netinet6/ip6_mroute.h>
110#include <netinet6/in6_ifattach.h>
111#include <netinet6/scope6_var.h>
112#include <netinet6/in6_fib.h>
113#include <netinet6/in6_pcb.h>
114
115VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
116#define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
117
118/*
119 * Definitions of some costant IP6 addresses.
120 */
121const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
122const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
123const struct in6_addr in6addr_nodelocal_allnodes =
124	IN6ADDR_NODELOCAL_ALLNODES_INIT;
125const struct in6_addr in6addr_linklocal_allnodes =
126	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
127const struct in6_addr in6addr_linklocal_allrouters =
128	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
129const struct in6_addr in6addr_linklocal_allv2routers =
130	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
131
132const struct in6_addr in6mask0 = IN6MASK0;
133const struct in6_addr in6mask32 = IN6MASK32;
134const struct in6_addr in6mask64 = IN6MASK64;
135const struct in6_addr in6mask96 = IN6MASK96;
136const struct in6_addr in6mask128 = IN6MASK128;
137
138const struct sockaddr_in6 sa6_any =
139	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
140
141static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
142	struct in6_aliasreq *, int);
143static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
144
145static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
146    struct in6_ifaddr *, int);
147static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
148    struct in6_aliasreq *, int flags);
149static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
150    struct in6_ifaddr *, int, int);
151static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
152    struct in6_ifaddr *, int);
153
154#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
155#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
156
157
158void
159in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
160{
161	struct sockaddr_dl gateway;
162	struct sockaddr_in6 mask, addr;
163	struct rtentry rt;
164	int fibnum;
165
166	/*
167	 * initialize for rtmsg generation
168	 */
169	bzero(&gateway, sizeof(gateway));
170	gateway.sdl_len = sizeof(gateway);
171	gateway.sdl_family = AF_LINK;
172
173	bzero(&rt, sizeof(rt));
174	rt.rt_gateway = (struct sockaddr *)&gateway;
175	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
176	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
177	rt_mask(&rt) = (struct sockaddr *)&mask;
178	rt_key(&rt) = (struct sockaddr *)&addr;
179	rt.rt_flags = RTF_HOST | RTF_STATIC;
180	if (cmd == RTM_ADD)
181		rt.rt_flags |= RTF_UP;
182	fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib;
183	/* Announce arrival of local address to this FIB. */
184	rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum);
185}
186
187int
188in6_mask2len(struct in6_addr *mask, u_char *lim0)
189{
190	int x = 0, y;
191	u_char *lim = lim0, *p;
192
193	/* ignore the scope_id part */
194	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
195		lim = (u_char *)mask + sizeof(*mask);
196	for (p = (u_char *)mask; p < lim; x++, p++) {
197		if (*p != 0xff)
198			break;
199	}
200	y = 0;
201	if (p < lim) {
202		for (y = 0; y < 8; y++) {
203			if ((*p & (0x80 >> y)) == 0)
204				break;
205		}
206	}
207
208	/*
209	 * when the limit pointer is given, do a stricter check on the
210	 * remaining bits.
211	 */
212	if (p < lim) {
213		if (y != 0 && (*p & (0x00ff >> y)) != 0)
214			return (-1);
215		for (p = p + 1; p < lim; p++)
216			if (*p != 0)
217				return (-1);
218	}
219
220	return x * 8 + y;
221}
222
223#ifdef COMPAT_FREEBSD32
224struct in6_ndifreq32 {
225	char ifname[IFNAMSIZ];
226	uint32_t ifindex;
227};
228#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
229#endif
230
231int
232in6_control(struct socket *so, u_long cmd, caddr_t data,
233    struct ifnet *ifp, struct thread *td)
234{
235	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
236	struct	in6_ifaddr *ia = NULL;
237	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
238	struct sockaddr_in6 *sa6;
239	int carp_attached = 0;
240	int error;
241	u_long ocmd = cmd;
242
243	/*
244	 * Compat to make pre-10.x ifconfig(8) operable.
245	 */
246	if (cmd == OSIOCAIFADDR_IN6)
247		cmd = SIOCAIFADDR_IN6;
248
249	switch (cmd) {
250	case SIOCGETSGCNT_IN6:
251	case SIOCGETMIFCNT_IN6:
252		/*
253		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
254		 * We cannot see how that would be needed, so do not adjust the
255		 * KPI blindly; more likely should clean up the IPv4 variant.
256		 */
257		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
258	}
259
260	switch (cmd) {
261	case SIOCAADDRCTL_POLICY:
262	case SIOCDADDRCTL_POLICY:
263		if (td != NULL) {
264			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
265			if (error)
266				return (error);
267		}
268		return (in6_src_ioctl(cmd, data));
269	}
270
271	if (ifp == NULL)
272		return (EOPNOTSUPP);
273
274	switch (cmd) {
275	case SIOCSNDFLUSH_IN6:
276	case SIOCSPFXFLUSH_IN6:
277	case SIOCSRTRFLUSH_IN6:
278	case SIOCSDEFIFACE_IN6:
279	case SIOCSIFINFO_FLAGS:
280	case SIOCSIFINFO_IN6:
281		if (td != NULL) {
282			error = priv_check(td, PRIV_NETINET_ND6);
283			if (error)
284				return (error);
285		}
286		/* FALLTHROUGH */
287	case OSIOCGIFINFO_IN6:
288	case SIOCGIFINFO_IN6:
289	case SIOCGNBRINFO_IN6:
290	case SIOCGDEFIFACE_IN6:
291		return (nd6_ioctl(cmd, data, ifp));
292
293#ifdef COMPAT_FREEBSD32
294	case SIOCGDEFIFACE32_IN6:
295		{
296			struct in6_ndifreq ndif;
297			struct in6_ndifreq32 *ndif32;
298
299			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
300			    ifp);
301			if (error)
302				return (error);
303			ndif32 = (struct in6_ndifreq32 *)data;
304			ndif32->ifindex = ndif.ifindex;
305			return (0);
306		}
307#endif
308	}
309
310	switch (cmd) {
311	case SIOCSIFPREFIX_IN6:
312	case SIOCDIFPREFIX_IN6:
313	case SIOCAIFPREFIX_IN6:
314	case SIOCCIFPREFIX_IN6:
315	case SIOCSGIFPREFIX_IN6:
316	case SIOCGIFPREFIX_IN6:
317		log(LOG_NOTICE,
318		    "prefix ioctls are now invalidated. "
319		    "please use ifconfig.\n");
320		return (EOPNOTSUPP);
321	}
322
323	switch (cmd) {
324	case SIOCSSCOPE6:
325		if (td != NULL) {
326			error = priv_check(td, PRIV_NETINET_SCOPE6);
327			if (error)
328				return (error);
329		}
330		/* FALLTHROUGH */
331	case SIOCGSCOPE6:
332	case SIOCGSCOPE6DEF:
333		return (scope6_ioctl(cmd, data, ifp));
334	}
335
336	/*
337	 * Find address for this interface, if it exists.
338	 *
339	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
340	 * only, and used the first interface address as the target of other
341	 * operations (without checking ifra_addr).  This was because netinet
342	 * code/API assumed at most 1 interface address per interface.
343	 * Since IPv6 allows a node to assign multiple addresses
344	 * on a single interface, we almost always look and check the
345	 * presence of ifra_addr, and reject invalid ones here.
346	 * It also decreases duplicated code among SIOC*_IN6 operations.
347	 */
348	switch (cmd) {
349	case SIOCAIFADDR_IN6:
350	case SIOCSIFPHYADDR_IN6:
351		sa6 = &ifra->ifra_addr;
352		break;
353	case SIOCSIFADDR_IN6:
354	case SIOCGIFADDR_IN6:
355	case SIOCSIFDSTADDR_IN6:
356	case SIOCSIFNETMASK_IN6:
357	case SIOCGIFDSTADDR_IN6:
358	case SIOCGIFNETMASK_IN6:
359	case SIOCDIFADDR_IN6:
360	case SIOCGIFPSRCADDR_IN6:
361	case SIOCGIFPDSTADDR_IN6:
362	case SIOCGIFAFLAG_IN6:
363	case SIOCSNDFLUSH_IN6:
364	case SIOCSPFXFLUSH_IN6:
365	case SIOCSRTRFLUSH_IN6:
366	case SIOCGIFALIFETIME_IN6:
367	case SIOCGIFSTAT_IN6:
368	case SIOCGIFSTAT_ICMP6:
369		sa6 = &ifr->ifr_addr;
370		break;
371	case SIOCSIFADDR:
372	case SIOCSIFBRDADDR:
373	case SIOCSIFDSTADDR:
374	case SIOCSIFNETMASK:
375		/*
376		 * Although we should pass any non-INET6 ioctl requests
377		 * down to driver, we filter some legacy INET requests.
378		 * Drivers trust SIOCSIFADDR et al to come from an already
379		 * privileged layer, and do not perform any credentials
380		 * checks or input validation.
381		 */
382		return (EINVAL);
383	default:
384		sa6 = NULL;
385		break;
386	}
387	if (sa6 && sa6->sin6_family == AF_INET6) {
388		if (sa6->sin6_scope_id != 0)
389			error = sa6_embedscope(sa6, 0);
390		else
391			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
392		if (error != 0)
393			return (error);
394		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
395		    &sa6->sin6_addr)) != 0)
396			return (error);
397		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
398	} else
399		ia = NULL;
400
401	switch (cmd) {
402	case SIOCSIFADDR_IN6:
403	case SIOCSIFDSTADDR_IN6:
404	case SIOCSIFNETMASK_IN6:
405		/*
406		 * Since IPv6 allows a node to assign multiple addresses
407		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
408		 */
409		/* we decided to obsolete this command (20000704) */
410		error = EINVAL;
411		goto out;
412
413	case SIOCDIFADDR_IN6:
414		/*
415		 * for IPv4, we look for existing in_ifaddr here to allow
416		 * "ifconfig if0 delete" to remove the first IPv4 address on
417		 * the interface.  For IPv6, as the spec allows multiple
418		 * interface address from the day one, we consider "remove the
419		 * first one" semantics to be not preferable.
420		 */
421		if (ia == NULL) {
422			error = EADDRNOTAVAIL;
423			goto out;
424		}
425		/* FALLTHROUGH */
426	case SIOCAIFADDR_IN6:
427		/*
428		 * We always require users to specify a valid IPv6 address for
429		 * the corresponding operation.
430		 */
431		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
432		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
433			error = EAFNOSUPPORT;
434			goto out;
435		}
436
437		if (td != NULL) {
438			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
439			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
440			if (error)
441				goto out;
442		}
443		/* FALLTHROUGH */
444	case SIOCGIFSTAT_IN6:
445	case SIOCGIFSTAT_ICMP6:
446		if (ifp->if_afdata[AF_INET6] == NULL) {
447			error = EPFNOSUPPORT;
448			goto out;
449		}
450		break;
451
452	case SIOCGIFADDR_IN6:
453		/* This interface is basically deprecated. use SIOCGIFCONF. */
454		/* FALLTHROUGH */
455	case SIOCGIFAFLAG_IN6:
456	case SIOCGIFNETMASK_IN6:
457	case SIOCGIFDSTADDR_IN6:
458	case SIOCGIFALIFETIME_IN6:
459		/* must think again about its semantics */
460		if (ia == NULL) {
461			error = EADDRNOTAVAIL;
462			goto out;
463		}
464		break;
465	}
466
467	switch (cmd) {
468	case SIOCGIFADDR_IN6:
469		ifr->ifr_addr = ia->ia_addr;
470		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
471			goto out;
472		break;
473
474	case SIOCGIFDSTADDR_IN6:
475		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
476			error = EINVAL;
477			goto out;
478		}
479		/*
480		 * XXX: should we check if ifa_dstaddr is NULL and return
481		 * an error?
482		 */
483		ifr->ifr_dstaddr = ia->ia_dstaddr;
484		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
485			goto out;
486		break;
487
488	case SIOCGIFNETMASK_IN6:
489		ifr->ifr_addr = ia->ia_prefixmask;
490		break;
491
492	case SIOCGIFAFLAG_IN6:
493		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
494		break;
495
496	case SIOCGIFSTAT_IN6:
497		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
498		    ifp->if_afdata[AF_INET6])->in6_ifstat,
499		    &ifr->ifr_ifru.ifru_stat,
500		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
501		break;
502
503	case SIOCGIFSTAT_ICMP6:
504		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
505		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
506		    &ifr->ifr_ifru.ifru_icmp6stat,
507		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
508		break;
509
510	case SIOCGIFALIFETIME_IN6:
511		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
512		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
513			time_t maxexpire;
514			struct in6_addrlifetime *retlt =
515			    &ifr->ifr_ifru.ifru_lifetime;
516
517			/*
518			 * XXX: adjust expiration time assuming time_t is
519			 * signed.
520			 */
521			maxexpire = (-1) &
522			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
523			if (ia->ia6_lifetime.ia6t_vltime <
524			    maxexpire - ia->ia6_updatetime) {
525				retlt->ia6t_expire = ia->ia6_updatetime +
526				    ia->ia6_lifetime.ia6t_vltime;
527			} else
528				retlt->ia6t_expire = maxexpire;
529		}
530		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
531			time_t maxexpire;
532			struct in6_addrlifetime *retlt =
533			    &ifr->ifr_ifru.ifru_lifetime;
534
535			/*
536			 * XXX: adjust expiration time assuming time_t is
537			 * signed.
538			 */
539			maxexpire = (-1) &
540			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
541			if (ia->ia6_lifetime.ia6t_pltime <
542			    maxexpire - ia->ia6_updatetime) {
543				retlt->ia6t_preferred = ia->ia6_updatetime +
544				    ia->ia6_lifetime.ia6t_pltime;
545			} else
546				retlt->ia6t_preferred = maxexpire;
547		}
548		break;
549
550	case SIOCAIFADDR_IN6:
551	{
552		struct nd_prefixctl pr0;
553		struct nd_prefix *pr;
554
555		/*
556		 * first, make or update the interface address structure,
557		 * and link it to the list.
558		 */
559		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
560			goto out;
561		if (ia != NULL) {
562			if (ia->ia_ifa.ifa_carp)
563				(*carp_detach_p)(&ia->ia_ifa, true);
564			ifa_free(&ia->ia_ifa);
565		}
566		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
567		    == NULL) {
568			/*
569			 * this can happen when the user specify the 0 valid
570			 * lifetime.
571			 */
572			break;
573		}
574
575		if (cmd == ocmd && ifra->ifra_vhid > 0) {
576			if (carp_attach_p != NULL)
577				error = (*carp_attach_p)(&ia->ia_ifa,
578				    ifra->ifra_vhid);
579			else
580				error = EPROTONOSUPPORT;
581			if (error)
582				goto out;
583			else
584				carp_attached = 1;
585		}
586
587		/*
588		 * then, make the prefix on-link on the interface.
589		 * XXX: we'd rather create the prefix before the address, but
590		 * we need at least one address to install the corresponding
591		 * interface route, so we configure the address first.
592		 */
593
594		/*
595		 * convert mask to prefix length (prefixmask has already
596		 * been validated in in6_update_ifa().
597		 */
598		bzero(&pr0, sizeof(pr0));
599		pr0.ndpr_ifp = ifp;
600		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
601		    NULL);
602		if (pr0.ndpr_plen == 128) {
603			/* we don't need to install a host route. */
604			goto aifaddr_out;
605		}
606		pr0.ndpr_prefix = ifra->ifra_addr;
607		/* apply the mask for safety. */
608		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
609		    &ifra->ifra_prefixmask.sin6_addr);
610
611		/*
612		 * XXX: since we don't have an API to set prefix (not address)
613		 * lifetimes, we just use the same lifetimes as addresses.
614		 * The (temporarily) installed lifetimes can be overridden by
615		 * later advertised RAs (when accept_rtadv is non 0), which is
616		 * an intended behavior.
617		 */
618		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
619		pr0.ndpr_raf_auto =
620		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
621		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
622		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
623
624		/* add the prefix if not yet. */
625		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
626			/*
627			 * nd6_prelist_add will install the corresponding
628			 * interface route.
629			 */
630			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
631				if (carp_attached)
632					(*carp_detach_p)(&ia->ia_ifa, false);
633				goto out;
634			}
635		}
636
637		/* relate the address to the prefix */
638		if (ia->ia6_ndpr == NULL) {
639			ia->ia6_ndpr = pr;
640			pr->ndpr_addrcnt++;
641
642			/*
643			 * If this is the first autoconf address from the
644			 * prefix, create a temporary address as well
645			 * (when required).
646			 */
647			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
648			    V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
649				int e;
650				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
651					log(LOG_NOTICE, "in6_control: failed "
652					    "to create a temporary address, "
653					    "errno=%d\n", e);
654				}
655			}
656		}
657		nd6_prefix_rele(pr);
658
659		/*
660		 * this might affect the status of autoconfigured addresses,
661		 * that is, this address might make other addresses detached.
662		 */
663		pfxlist_onlink_check();
664
665aifaddr_out:
666		/*
667		 * Try to clear the flag when a new IPv6 address is added
668		 * onto an IFDISABLED interface and it succeeds.
669		 */
670		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
671			struct in6_ndireq nd;
672
673			memset(&nd, 0, sizeof(nd));
674			nd.ndi.flags = ND_IFINFO(ifp)->flags;
675			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
676			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
677				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
678				    "SIOCSIFINFO_FLAGS for -ifdisabled "
679				    "failed.");
680			/*
681			 * Ignore failure of clearing the flag intentionally.
682			 * The failure means address duplication was detected.
683			 */
684		}
685		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
686		break;
687	}
688
689	case SIOCDIFADDR_IN6:
690	{
691		struct nd_prefix *pr;
692
693		/*
694		 * If the address being deleted is the only one that owns
695		 * the corresponding prefix, expire the prefix as well.
696		 * XXX: theoretically, we don't have to worry about such
697		 * relationship, since we separate the address management
698		 * and the prefix management.  We do this, however, to provide
699		 * as much backward compatibility as possible in terms of
700		 * the ioctl operation.
701		 * Note that in6_purgeaddr() will decrement ndpr_addrcnt.
702		 */
703		pr = ia->ia6_ndpr;
704		in6_purgeaddr(&ia->ia_ifa);
705		if (pr != NULL && pr->ndpr_addrcnt == 0) {
706			ND6_WLOCK();
707			nd6_prefix_unlink(pr, NULL);
708			ND6_WUNLOCK();
709			nd6_prefix_del(pr);
710		}
711		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
712		break;
713	}
714
715	default:
716		if (ifp->if_ioctl == NULL) {
717			error = EOPNOTSUPP;
718			goto out;
719		}
720		error = (*ifp->if_ioctl)(ifp, cmd, data);
721		goto out;
722	}
723
724	error = 0;
725out:
726	if (ia != NULL)
727		ifa_free(&ia->ia_ifa);
728	return (error);
729}
730
731
732/*
733 * Join necessary multicast groups.  Factored out from in6_update_ifa().
734 * This entire work should only be done once, for the default FIB.
735 */
736static int
737in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
738    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
739{
740	char ip6buf[INET6_ADDRSTRLEN];
741	struct in6_addr mltaddr;
742	struct in6_multi_mship *imm;
743	int delay, error;
744
745	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
746
747	/* Join solicited multicast addr for new host id. */
748	bzero(&mltaddr, sizeof(struct in6_addr));
749	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
750	mltaddr.s6_addr32[2] = htonl(1);
751	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
752	mltaddr.s6_addr8[12] = 0xff;
753	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
754		/* XXX: should not happen */
755		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
756		goto cleanup;
757	}
758	delay = error = 0;
759	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
760		/*
761		 * We need a random delay for DAD on the address being
762		 * configured.  It also means delaying transmission of the
763		 * corresponding MLD report to avoid report collision.
764		 * [RFC 4861, Section 6.3.7]
765		 */
766		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
767	}
768	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
769	if (imm == NULL) {
770		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
771		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
772		    if_name(ifp), error));
773		goto cleanup;
774	}
775	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
776	*in6m_sol = imm->i6mm_maddr;
777
778	/*
779	 * Join link-local all-nodes address.
780	 */
781	mltaddr = in6addr_linklocal_allnodes;
782	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
783		goto cleanup; /* XXX: should not fail */
784
785	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
786	if (imm == NULL) {
787		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
788		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
789		    if_name(ifp), error));
790		goto cleanup;
791	}
792	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
793
794	/*
795	 * Join node information group address.
796	 */
797	delay = 0;
798	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
799		/*
800		 * The spec does not say anything about delay for this group,
801		 * but the same logic should apply.
802		 */
803		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
804	}
805	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
806		/* XXX jinmei */
807		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
808		if (imm == NULL)
809			nd6log((LOG_WARNING,
810			    "%s: in6_joingroup failed for %s on %s "
811			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
812			    &mltaddr), if_name(ifp), error));
813			/* XXX not very fatal, go on... */
814		else
815			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816	}
817	if (V_icmp6_nodeinfo_oldmcprefix &&
818	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
819		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
820		if (imm == NULL)
821			nd6log((LOG_WARNING,
822			    "%s: in6_joingroup failed for %s on %s "
823			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
824			    &mltaddr), if_name(ifp), error));
825			/* XXX not very fatal, go on... */
826		else
827			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
828	}
829
830	/*
831	 * Join interface-local all-nodes address.
832	 * (ff01::1%ifN, and ff01::%ifN/32)
833	 */
834	mltaddr = in6addr_nodelocal_allnodes;
835	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
836		goto cleanup; /* XXX: should not fail */
837
838	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
839	if (imm == NULL) {
840		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
841		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
842		    &mltaddr), if_name(ifp), error));
843		goto cleanup;
844	}
845	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
846
847cleanup:
848	return (error);
849}
850
851/*
852 * Update parameters of an IPv6 interface address.
853 * If necessary, a new entry is created and linked into address chains.
854 * This function is separated from in6_control().
855 */
856int
857in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
858    struct in6_ifaddr *ia, int flags)
859{
860	int error, hostIsNew = 0;
861
862	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
863		return (error);
864
865	if (ia == NULL) {
866		hostIsNew = 1;
867		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
868			return (ENOBUFS);
869	}
870
871	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
872	if (error != 0) {
873		if (hostIsNew != 0) {
874			in6_unlink_ifa(ia, ifp);
875			ifa_free(&ia->ia_ifa);
876		}
877		return (error);
878	}
879
880	if (hostIsNew)
881		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
882
883	return (error);
884}
885
886/*
887 * Fill in basic IPv6 address request info.
888 */
889void
890in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
891    const struct in6_addr *mask)
892{
893
894	memset(ifra, 0, sizeof(struct in6_aliasreq));
895
896	ifra->ifra_addr.sin6_family = AF_INET6;
897	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
898	if (addr != NULL)
899		ifra->ifra_addr.sin6_addr = *addr;
900
901	ifra->ifra_prefixmask.sin6_family = AF_INET6;
902	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
903	if (mask != NULL)
904		ifra->ifra_prefixmask.sin6_addr = *mask;
905}
906
907static int
908in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
909    struct in6_ifaddr *ia, int flags)
910{
911	int plen = -1;
912	struct sockaddr_in6 dst6;
913	struct in6_addrlifetime *lt;
914	char ip6buf[INET6_ADDRSTRLEN];
915
916	/* Validate parameters */
917	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
918		return (EINVAL);
919
920	/*
921	 * The destination address for a p2p link must have a family
922	 * of AF_UNSPEC or AF_INET6.
923	 */
924	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
925	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
926	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
927		return (EAFNOSUPPORT);
928
929	/*
930	 * Validate address
931	 */
932	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
933	    ifra->ifra_addr.sin6_family != AF_INET6)
934		return (EINVAL);
935
936	/*
937	 * validate ifra_prefixmask.  don't check sin6_family, netmask
938	 * does not carry fields other than sin6_len.
939	 */
940	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
941		return (EINVAL);
942	/*
943	 * Because the IPv6 address architecture is classless, we require
944	 * users to specify a (non 0) prefix length (mask) for a new address.
945	 * We also require the prefix (when specified) mask is valid, and thus
946	 * reject a non-consecutive mask.
947	 */
948	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
949		return (EINVAL);
950	if (ifra->ifra_prefixmask.sin6_len != 0) {
951		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
952		    (u_char *)&ifra->ifra_prefixmask +
953		    ifra->ifra_prefixmask.sin6_len);
954		if (plen <= 0)
955			return (EINVAL);
956	} else {
957		/*
958		 * In this case, ia must not be NULL.  We just use its prefix
959		 * length.
960		 */
961		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
962	}
963	/*
964	 * If the destination address on a p2p interface is specified,
965	 * and the address is a scoped one, validate/set the scope
966	 * zone identifier.
967	 */
968	dst6 = ifra->ifra_dstaddr;
969	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
970	    (dst6.sin6_family == AF_INET6)) {
971		struct in6_addr in6_tmp;
972		u_int32_t zoneid;
973
974		in6_tmp = dst6.sin6_addr;
975		if (in6_setscope(&in6_tmp, ifp, &zoneid))
976			return (EINVAL); /* XXX: should be impossible */
977
978		if (dst6.sin6_scope_id != 0) {
979			if (dst6.sin6_scope_id != zoneid)
980				return (EINVAL);
981		} else		/* user omit to specify the ID. */
982			dst6.sin6_scope_id = zoneid;
983
984		/* convert into the internal form */
985		if (sa6_embedscope(&dst6, 0))
986			return (EINVAL); /* XXX: should be impossible */
987	}
988	/* Modify original ifra_dstaddr to reflect changes */
989	ifra->ifra_dstaddr = dst6;
990
991	/*
992	 * The destination address can be specified only for a p2p or a
993	 * loopback interface.  If specified, the corresponding prefix length
994	 * must be 128.
995	 */
996	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
997		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
998			/* XXX: noisy message */
999			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1000			    "be specified for a p2p or a loopback IF only\n"));
1001			return (EINVAL);
1002		}
1003		if (plen != 128) {
1004			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1005			    "be 128 when dstaddr is specified\n"));
1006			return (EINVAL);
1007		}
1008	}
1009	/* lifetime consistency check */
1010	lt = &ifra->ifra_lifetime;
1011	if (lt->ia6t_pltime > lt->ia6t_vltime)
1012		return (EINVAL);
1013	if (lt->ia6t_vltime == 0) {
1014		/*
1015		 * the following log might be noisy, but this is a typical
1016		 * configuration mistake or a tool's bug.
1017		 */
1018		nd6log((LOG_INFO,
1019		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1020		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1021
1022		if (ia == NULL)
1023			return (0); /* there's nothing to do */
1024	}
1025
1026	/* Check prefix mask */
1027	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1028		/*
1029		 * We prohibit changing the prefix length of an existing
1030		 * address, because
1031		 * + such an operation should be rare in IPv6, and
1032		 * + the operation would confuse prefix management.
1033		 */
1034		if (ia->ia_prefixmask.sin6_len != 0 &&
1035		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1036			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1037			    "of an existing %s address should not be changed\n",
1038			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1039
1040			return (EINVAL);
1041		}
1042	}
1043
1044	return (0);
1045}
1046
1047
1048/*
1049 * Allocate a new ifaddr and link it into chains.
1050 */
1051static struct in6_ifaddr *
1052in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1053{
1054	struct in6_ifaddr *ia;
1055
1056	/*
1057	 * When in6_alloc_ifa() is called in a process of a received
1058	 * RA, it is called under an interrupt context.  So, we should
1059	 * call malloc with M_NOWAIT.
1060	 */
1061	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1062	if (ia == NULL)
1063		return (NULL);
1064	LIST_INIT(&ia->ia6_memberships);
1065	/* Initialize the address and masks, and put time stamp */
1066	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1067	ia->ia_addr.sin6_family = AF_INET6;
1068	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1069	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1070	ia->ia_addr = ifra->ifra_addr;
1071	ia->ia6_createtime = time_uptime;
1072	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1073		/*
1074		 * Some functions expect that ifa_dstaddr is not
1075		 * NULL for p2p interfaces.
1076		 */
1077		ia->ia_ifa.ifa_dstaddr =
1078		    (struct sockaddr *)&ia->ia_dstaddr;
1079	} else {
1080		ia->ia_ifa.ifa_dstaddr = NULL;
1081	}
1082
1083	/* set prefix mask if any */
1084	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1085	if (ifra->ifra_prefixmask.sin6_len != 0) {
1086		ia->ia_prefixmask.sin6_family = AF_INET6;
1087		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1088		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1089	}
1090
1091	ia->ia_ifp = ifp;
1092	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1093	IF_ADDR_WLOCK(ifp);
1094	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1095	IF_ADDR_WUNLOCK(ifp);
1096
1097	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1098	IN6_IFADDR_WLOCK();
1099	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1100	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1101	IN6_IFADDR_WUNLOCK();
1102
1103	return (ia);
1104}
1105
1106/*
1107 * Update/configure interface address parameters:
1108 *
1109 * 1) Update lifetime
1110 * 2) Update interface metric ad flags
1111 * 3) Notify other subsystems
1112 */
1113static int
1114in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1115    struct in6_ifaddr *ia, int hostIsNew, int flags)
1116{
1117	int error;
1118
1119	/* update timestamp */
1120	ia->ia6_updatetime = time_uptime;
1121
1122	/*
1123	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1124	 * to see if the address is deprecated or invalidated, but initialize
1125	 * these members for applications.
1126	 */
1127	ia->ia6_lifetime = ifra->ifra_lifetime;
1128	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1129		ia->ia6_lifetime.ia6t_expire =
1130		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1131	} else
1132		ia->ia6_lifetime.ia6t_expire = 0;
1133	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1134		ia->ia6_lifetime.ia6t_preferred =
1135		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1136	} else
1137		ia->ia6_lifetime.ia6t_preferred = 0;
1138
1139	/*
1140	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1141	 * userland, make it deprecated.
1142	 */
1143	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1144		ia->ia6_lifetime.ia6t_pltime = 0;
1145		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1146	}
1147
1148	/*
1149	 * configure address flags.
1150	 */
1151	ia->ia6_flags = ifra->ifra_flags;
1152
1153	/*
1154	 * Make the address tentative before joining multicast addresses,
1155	 * so that corresponding MLD responses would not have a tentative
1156	 * source address.
1157	 */
1158	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1159
1160	/*
1161	 * DAD should be performed for an new address or addresses on
1162	 * an interface with ND6_IFF_IFDISABLED.
1163	 */
1164	if (in6if_do_dad(ifp) &&
1165	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1166		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1167
1168	/* notify other subsystems */
1169	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1170
1171	return (error);
1172}
1173
1174/*
1175 * Do link-level ifa job:
1176 * 1) Add lle entry for added address
1177 * 2) Notifies routing socket users about new address
1178 * 3) join appropriate multicast group
1179 * 4) start DAD if enabled
1180 */
1181static int
1182in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1183    struct in6_ifaddr *ia, int flags)
1184{
1185	struct in6_multi *in6m_sol;
1186	int error = 0;
1187
1188	/* Add local address to lltable, if necessary (ex. on p2p link). */
1189	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1190		in6_purgeaddr(&ia->ia_ifa);
1191		ifa_free(&ia->ia_ifa);
1192		return (error);
1193	}
1194
1195	/* Join necessary multicast groups. */
1196	in6m_sol = NULL;
1197	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1198		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1199		if (error != 0) {
1200			in6_purgeaddr(&ia->ia_ifa);
1201			ifa_free(&ia->ia_ifa);
1202			return (error);
1203		}
1204	}
1205
1206	/* Perform DAD, if the address is TENTATIVE. */
1207	if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1208		int delay, mindelay, maxdelay;
1209
1210		delay = 0;
1211		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1212			/*
1213			 * We need to impose a delay before sending an NS
1214			 * for DAD.  Check if we also needed a delay for the
1215			 * corresponding MLD message.  If we did, the delay
1216			 * should be larger than the MLD delay (this could be
1217			 * relaxed a bit, but this simple logic is at least
1218			 * safe).
1219			 * XXX: Break data hiding guidelines and look at
1220			 * state for the solicited multicast group.
1221			 */
1222			mindelay = 0;
1223			if (in6m_sol != NULL &&
1224			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1225				mindelay = in6m_sol->in6m_timer;
1226			}
1227			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1228			if (maxdelay - mindelay == 0)
1229				delay = 0;
1230			else {
1231				delay =
1232				    (arc4random() % (maxdelay - mindelay)) +
1233				    mindelay;
1234			}
1235		}
1236		nd6_dad_start((struct ifaddr *)ia, delay);
1237	}
1238
1239	in6_newaddrmsg(ia, RTM_ADD);
1240	ifa_free(&ia->ia_ifa);
1241	return (error);
1242}
1243
1244void
1245in6_purgeaddr(struct ifaddr *ifa)
1246{
1247	struct ifnet *ifp = ifa->ifa_ifp;
1248	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1249	struct in6_multi_mship *imm;
1250	int plen, error;
1251
1252	if (ifa->ifa_carp)
1253		(*carp_detach_p)(ifa, false);
1254
1255	/*
1256	 * Remove the loopback route to the interface address.
1257	 * The check for the current setting of "nd6_useloopback"
1258	 * is not needed.
1259	 */
1260	if (ia->ia_flags & IFA_RTSELF) {
1261		error = ifa_del_loopback_route((struct ifaddr *)ia,
1262		    (struct sockaddr *)&ia->ia_addr);
1263		if (error == 0)
1264			ia->ia_flags &= ~IFA_RTSELF;
1265	}
1266
1267	/* stop DAD processing */
1268	nd6_dad_stop(ifa);
1269
1270	/* Leave multicast groups. */
1271	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1272		LIST_REMOVE(imm, i6mm_chain);
1273		in6_leavegroup(imm);
1274	}
1275	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1276	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1277		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1278		    (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0));
1279		if (error != 0)
1280			log(LOG_INFO, "%s: err=%d, destination address delete "
1281			    "failed\n", __func__, error);
1282		ia->ia_flags &= ~IFA_ROUTE;
1283	}
1284
1285	in6_newaddrmsg(ia, RTM_DELETE);
1286	in6_unlink_ifa(ia, ifp);
1287}
1288
1289static void
1290in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1291{
1292	char ip6buf[INET6_ADDRSTRLEN];
1293	int remove_lle;
1294
1295	IF_ADDR_WLOCK(ifp);
1296	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1297	IF_ADDR_WUNLOCK(ifp);
1298	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1299
1300	/*
1301	 * Defer the release of what might be the last reference to the
1302	 * in6_ifaddr so that it can't be freed before the remainder of the
1303	 * cleanup.
1304	 */
1305	IN6_IFADDR_WLOCK();
1306	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1307	LIST_REMOVE(ia, ia6_hash);
1308	IN6_IFADDR_WUNLOCK();
1309
1310	/*
1311	 * Release the reference to the base prefix.  There should be a
1312	 * positive reference.
1313	 */
1314	remove_lle = 0;
1315	if (ia->ia6_ndpr == NULL) {
1316		nd6log((LOG_NOTICE,
1317		    "in6_unlink_ifa: autoconf'ed address "
1318		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1319	} else {
1320		ia->ia6_ndpr->ndpr_addrcnt--;
1321		/* Do not delete lles within prefix if refcont != 0 */
1322		if (ia->ia6_ndpr->ndpr_addrcnt == 0)
1323			remove_lle = 1;
1324		ia->ia6_ndpr = NULL;
1325	}
1326
1327	nd6_rem_ifa_lle(ia, remove_lle);
1328
1329	/*
1330	 * Also, if the address being removed is autoconf'ed, call
1331	 * pfxlist_onlink_check() since the release might affect the status of
1332	 * other (detached) addresses.
1333	 */
1334	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1335		pfxlist_onlink_check();
1336	}
1337	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1338}
1339
1340/*
1341 * Notifies other subsystems about address change/arrival:
1342 * 1) Notifies device handler on the first IPv6 address assignment
1343 * 2) Handle routing table changes for P2P links and route
1344 * 3) Handle routing table changes for address host route
1345 */
1346static int
1347in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1348    struct in6_aliasreq *ifra, int hostIsNew)
1349{
1350	int	error = 0, plen, ifacount = 0;
1351	struct ifaddr *ifa;
1352	struct sockaddr_in6 *pdst;
1353	char ip6buf[INET6_ADDRSTRLEN];
1354
1355	/*
1356	 * Give the interface a chance to initialize
1357	 * if this is its first address,
1358	 */
1359	if (hostIsNew != 0) {
1360		IF_ADDR_RLOCK(ifp);
1361		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1362			if (ifa->ifa_addr->sa_family != AF_INET6)
1363				continue;
1364			ifacount++;
1365		}
1366		IF_ADDR_RUNLOCK(ifp);
1367	}
1368
1369	if (ifacount <= 1 && ifp->if_ioctl) {
1370		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1371		if (error)
1372			return (error);
1373	}
1374
1375	/*
1376	 * If a new destination address is specified, scrub the old one and
1377	 * install the new destination.  Note that the interface must be
1378	 * p2p or loopback.
1379	 */
1380	pdst = &ifra->ifra_dstaddr;
1381	if (pdst->sin6_family == AF_INET6 &&
1382	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1383		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1384		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1385			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1386			    "remove a route to the old destination: %s\n",
1387			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1388			/* proceed anyway... */
1389		} else
1390			ia->ia_flags &= ~IFA_ROUTE;
1391		ia->ia_dstaddr = *pdst;
1392	}
1393
1394	/*
1395	 * If a new destination address is specified for a point-to-point
1396	 * interface, install a route to the destination as an interface
1397	 * direct route.
1398	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1399	 * interface that share the same destination.
1400	 */
1401	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1402	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1403	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1404		int rtflags = RTF_UP | RTF_HOST;
1405		/*
1406		 * Handle the case for ::1 .
1407		 */
1408		if (ifp->if_flags & IFF_LOOPBACK)
1409			ia->ia_flags |= IFA_RTSELF;
1410		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1411		if (error)
1412			return (error);
1413		ia->ia_flags |= IFA_ROUTE;
1414	}
1415
1416	/*
1417	 * add a loopback route to self if not exists
1418	 */
1419	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1420		error = ifa_add_loopback_route((struct ifaddr *)ia,
1421		    (struct sockaddr *)&ia->ia_addr);
1422		if (error == 0)
1423			ia->ia_flags |= IFA_RTSELF;
1424	}
1425
1426	return (error);
1427}
1428
1429/*
1430 * Find an IPv6 interface link-local address specific to an interface.
1431 * ifaddr is returned referenced.
1432 */
1433struct in6_ifaddr *
1434in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1435{
1436	struct ifaddr *ifa;
1437
1438	IF_ADDR_RLOCK(ifp);
1439	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1440		if (ifa->ifa_addr->sa_family != AF_INET6)
1441			continue;
1442		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1443			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1444			    ignoreflags) != 0)
1445				continue;
1446			ifa_ref(ifa);
1447			break;
1448		}
1449	}
1450	IF_ADDR_RUNLOCK(ifp);
1451
1452	return ((struct in6_ifaddr *)ifa);
1453}
1454
1455
1456/*
1457 * find the interface address corresponding to a given IPv6 address.
1458 * ifaddr is returned referenced.
1459 */
1460struct in6_ifaddr *
1461in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1462{
1463	struct rm_priotracker in6_ifa_tracker;
1464	struct in6_ifaddr *ia;
1465
1466	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1467	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1468		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1469			if (zoneid != 0 &&
1470			    zoneid != ia->ia_addr.sin6_scope_id)
1471				continue;
1472			ifa_ref(&ia->ia_ifa);
1473			break;
1474		}
1475	}
1476	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1477	return (ia);
1478}
1479
1480/*
1481 * find the internet address corresponding to a given interface and address.
1482 * ifaddr is returned referenced.
1483 */
1484struct in6_ifaddr *
1485in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1486{
1487	struct ifaddr *ifa;
1488
1489	IF_ADDR_RLOCK(ifp);
1490	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1491		if (ifa->ifa_addr->sa_family != AF_INET6)
1492			continue;
1493		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1494			ifa_ref(ifa);
1495			break;
1496		}
1497	}
1498	IF_ADDR_RUNLOCK(ifp);
1499
1500	return ((struct in6_ifaddr *)ifa);
1501}
1502
1503/*
1504 * Find a link-local scoped address on ifp and return it if any.
1505 */
1506struct in6_ifaddr *
1507in6ifa_llaonifp(struct ifnet *ifp)
1508{
1509	struct sockaddr_in6 *sin6;
1510	struct ifaddr *ifa;
1511
1512	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1513		return (NULL);
1514	IF_ADDR_RLOCK(ifp);
1515	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1516		if (ifa->ifa_addr->sa_family != AF_INET6)
1517			continue;
1518		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1519		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1520		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1521		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1522			break;
1523	}
1524	IF_ADDR_RUNLOCK(ifp);
1525
1526	return ((struct in6_ifaddr *)ifa);
1527}
1528
1529/*
1530 * Convert IP6 address to printable (loggable) representation. Caller
1531 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1532 */
1533static char digits[] = "0123456789abcdef";
1534char *
1535ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1536{
1537	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1538	char *cp;
1539	const u_int16_t *a = (const u_int16_t *)addr;
1540	const u_int8_t *d;
1541	int dcolon = 0, zero = 0;
1542
1543	cp = ip6buf;
1544
1545	for (i = 0; i < 8; i++) {
1546		if (*(a + i) == 0) {
1547			cnt++;
1548			if (cnt == 1)
1549				idx = i;
1550		}
1551		else if (maxcnt < cnt) {
1552			maxcnt = cnt;
1553			index = idx;
1554			cnt = 0;
1555		}
1556	}
1557	if (maxcnt < cnt) {
1558		maxcnt = cnt;
1559		index = idx;
1560	}
1561
1562	for (i = 0; i < 8; i++) {
1563		if (dcolon == 1) {
1564			if (*a == 0) {
1565				if (i == 7)
1566					*cp++ = ':';
1567				a++;
1568				continue;
1569			} else
1570				dcolon = 2;
1571		}
1572		if (*a == 0) {
1573			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1574				if (i == 0)
1575					*cp++ = ':';
1576				*cp++ = ':';
1577				dcolon = 1;
1578			} else {
1579				*cp++ = '0';
1580				*cp++ = ':';
1581			}
1582			a++;
1583			continue;
1584		}
1585		d = (const u_char *)a;
1586		/* Try to eliminate leading zeros in printout like in :0001. */
1587		zero = 1;
1588		*cp = digits[*d >> 4];
1589		if (*cp != '0') {
1590			zero = 0;
1591			cp++;
1592		}
1593		*cp = digits[*d++ & 0xf];
1594		if (zero == 0 || (*cp != '0')) {
1595			zero = 0;
1596			cp++;
1597		}
1598		*cp = digits[*d >> 4];
1599		if (zero == 0 || (*cp != '0')) {
1600			zero = 0;
1601			cp++;
1602		}
1603		*cp++ = digits[*d & 0xf];
1604		*cp++ = ':';
1605		a++;
1606	}
1607	*--cp = '\0';
1608	return (ip6buf);
1609}
1610
1611int
1612in6_localaddr(struct in6_addr *in6)
1613{
1614	struct rm_priotracker in6_ifa_tracker;
1615	struct in6_ifaddr *ia;
1616
1617	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1618		return 1;
1619
1620	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1621	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1622		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1623		    &ia->ia_prefixmask.sin6_addr)) {
1624			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1625			return 1;
1626		}
1627	}
1628	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1629
1630	return (0);
1631}
1632
1633/*
1634 * Return 1 if an internet address is for the local host and configured
1635 * on one of its interfaces.
1636 */
1637int
1638in6_localip(struct in6_addr *in6)
1639{
1640	struct rm_priotracker in6_ifa_tracker;
1641	struct in6_ifaddr *ia;
1642
1643	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1644	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1645		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1646			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1647			return (1);
1648		}
1649	}
1650	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1651	return (0);
1652}
1653
1654/*
1655 * Return 1 if an internet address is configured on an interface.
1656 */
1657int
1658in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1659{
1660	struct in6_addr in6;
1661	struct ifaddr *ifa;
1662	struct in6_ifaddr *ia6;
1663
1664	in6 = *addr;
1665	if (in6_clearscope(&in6))
1666		return (0);
1667	in6_setscope(&in6, ifp, NULL);
1668
1669	IF_ADDR_RLOCK(ifp);
1670	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1671		if (ifa->ifa_addr->sa_family != AF_INET6)
1672			continue;
1673		ia6 = (struct in6_ifaddr *)ifa;
1674		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1675			IF_ADDR_RUNLOCK(ifp);
1676			return (1);
1677		}
1678	}
1679	IF_ADDR_RUNLOCK(ifp);
1680
1681	return (0);
1682}
1683
1684int
1685in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1686{
1687	struct rm_priotracker in6_ifa_tracker;
1688	struct in6_ifaddr *ia;
1689
1690	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1691	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1692		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1693			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1694				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1695				return (1); /* true */
1696			}
1697			break;
1698		}
1699	}
1700	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1701
1702	return (0);		/* false */
1703}
1704
1705/*
1706 * return length of part which dst and src are equal
1707 * hard coding...
1708 */
1709int
1710in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1711{
1712	int match = 0;
1713	u_char *s = (u_char *)src, *d = (u_char *)dst;
1714	u_char *lim = s + 16, r;
1715
1716	while (s < lim)
1717		if ((r = (*d++ ^ *s++)) != 0) {
1718			while (r < 128) {
1719				match++;
1720				r <<= 1;
1721			}
1722			break;
1723		} else
1724			match += 8;
1725	return match;
1726}
1727
1728/* XXX: to be scope conscious */
1729int
1730in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1731{
1732	int bytelen, bitlen;
1733
1734	/* sanity check */
1735	if (0 > len || len > 128) {
1736		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1737		    len);
1738		return (0);
1739	}
1740
1741	bytelen = len / 8;
1742	bitlen = len % 8;
1743
1744	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1745		return (0);
1746	if (bitlen != 0 &&
1747	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1748	    p2->s6_addr[bytelen] >> (8 - bitlen))
1749		return (0);
1750
1751	return (1);
1752}
1753
1754void
1755in6_prefixlen2mask(struct in6_addr *maskp, int len)
1756{
1757	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1758	int bytelen, bitlen, i;
1759
1760	/* sanity check */
1761	if (0 > len || len > 128) {
1762		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1763		    len);
1764		return;
1765	}
1766
1767	bzero(maskp, sizeof(*maskp));
1768	bytelen = len / 8;
1769	bitlen = len % 8;
1770	for (i = 0; i < bytelen; i++)
1771		maskp->s6_addr[i] = 0xff;
1772	if (bitlen)
1773		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1774}
1775
1776/*
1777 * return the best address out of the same scope. if no address was
1778 * found, return the first valid address from designated IF.
1779 */
1780struct in6_ifaddr *
1781in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1782{
1783	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1784	struct ifaddr *ifa;
1785	struct in6_ifaddr *besta = NULL;
1786	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1787
1788	dep[0] = dep[1] = NULL;
1789
1790	/*
1791	 * We first look for addresses in the same scope.
1792	 * If there is one, return it.
1793	 * If two or more, return one which matches the dst longest.
1794	 * If none, return one of global addresses assigned other ifs.
1795	 */
1796	IF_ADDR_RLOCK(ifp);
1797	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1798		if (ifa->ifa_addr->sa_family != AF_INET6)
1799			continue;
1800		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1801			continue; /* XXX: is there any case to allow anycast? */
1802		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1803			continue; /* don't use this interface */
1804		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1805			continue;
1806		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1807			if (V_ip6_use_deprecated)
1808				dep[0] = (struct in6_ifaddr *)ifa;
1809			continue;
1810		}
1811
1812		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1813			/*
1814			 * call in6_matchlen() as few as possible
1815			 */
1816			if (besta) {
1817				if (blen == -1)
1818					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1819				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1820				if (tlen > blen) {
1821					blen = tlen;
1822					besta = (struct in6_ifaddr *)ifa;
1823				}
1824			} else
1825				besta = (struct in6_ifaddr *)ifa;
1826		}
1827	}
1828	if (besta) {
1829		ifa_ref(&besta->ia_ifa);
1830		IF_ADDR_RUNLOCK(ifp);
1831		return (besta);
1832	}
1833
1834	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1835		if (ifa->ifa_addr->sa_family != AF_INET6)
1836			continue;
1837		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1838			continue; /* XXX: is there any case to allow anycast? */
1839		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1840			continue; /* don't use this interface */
1841		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1842			continue;
1843		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1844			if (V_ip6_use_deprecated)
1845				dep[1] = (struct in6_ifaddr *)ifa;
1846			continue;
1847		}
1848
1849		if (ifa != NULL)
1850			ifa_ref(ifa);
1851		IF_ADDR_RUNLOCK(ifp);
1852		return (struct in6_ifaddr *)ifa;
1853	}
1854
1855	/* use the last-resort values, that are, deprecated addresses */
1856	if (dep[0]) {
1857		ifa_ref((struct ifaddr *)dep[0]);
1858		IF_ADDR_RUNLOCK(ifp);
1859		return dep[0];
1860	}
1861	if (dep[1]) {
1862		ifa_ref((struct ifaddr *)dep[1]);
1863		IF_ADDR_RUNLOCK(ifp);
1864		return dep[1];
1865	}
1866
1867	IF_ADDR_RUNLOCK(ifp);
1868	return NULL;
1869}
1870
1871/*
1872 * perform DAD when interface becomes IFF_UP.
1873 */
1874void
1875in6_if_up(struct ifnet *ifp)
1876{
1877	struct ifaddr *ifa;
1878	struct in6_ifaddr *ia;
1879
1880	IF_ADDR_RLOCK(ifp);
1881	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1882		if (ifa->ifa_addr->sa_family != AF_INET6)
1883			continue;
1884		ia = (struct in6_ifaddr *)ifa;
1885		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1886			/*
1887			 * The TENTATIVE flag was likely set by hand
1888			 * beforehand, implicitly indicating the need for DAD.
1889			 * We may be able to skip the random delay in this
1890			 * case, but we impose delays just in case.
1891			 */
1892			nd6_dad_start(ifa,
1893			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1894		}
1895	}
1896	IF_ADDR_RUNLOCK(ifp);
1897
1898	/*
1899	 * special cases, like 6to4, are handled in in6_ifattach
1900	 */
1901	in6_ifattach(ifp, NULL);
1902}
1903
1904int
1905in6if_do_dad(struct ifnet *ifp)
1906{
1907	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1908		return (0);
1909
1910	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1911	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1912		return (0);
1913
1914	/*
1915	 * Our DAD routine requires the interface up and running.
1916	 * However, some interfaces can be up before the RUNNING
1917	 * status.  Additionally, users may try to assign addresses
1918	 * before the interface becomes up (or running).
1919	 * This function returns EAGAIN in that case.
1920	 * The caller should mark "tentative" on the address instead of
1921	 * performing DAD immediately.
1922	 */
1923	if (!((ifp->if_flags & IFF_UP) &&
1924	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1925		return (EAGAIN);
1926
1927	return (1);
1928}
1929
1930/*
1931 * Calculate max IPv6 MTU through all the interfaces and store it
1932 * to in6_maxmtu.
1933 */
1934void
1935in6_setmaxmtu(void)
1936{
1937	unsigned long maxmtu = 0;
1938	struct ifnet *ifp;
1939
1940	IFNET_RLOCK_NOSLEEP();
1941	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1942		/* this function can be called during ifnet initialization */
1943		if (!ifp->if_afdata[AF_INET6])
1944			continue;
1945		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1946		    IN6_LINKMTU(ifp) > maxmtu)
1947			maxmtu = IN6_LINKMTU(ifp);
1948	}
1949	IFNET_RUNLOCK_NOSLEEP();
1950	if (maxmtu)	/* update only when maxmtu is positive */
1951		V_in6_maxmtu = maxmtu;
1952}
1953
1954/*
1955 * Provide the length of interface identifiers to be used for the link attached
1956 * to the given interface.  The length should be defined in "IPv6 over
1957 * xxx-link" document.  Note that address architecture might also define
1958 * the length for a particular set of address prefixes, regardless of the
1959 * link type.  As clarified in rfc2462bis, those two definitions should be
1960 * consistent, and those really are as of August 2004.
1961 */
1962int
1963in6_if2idlen(struct ifnet *ifp)
1964{
1965	switch (ifp->if_type) {
1966	case IFT_ETHER:		/* RFC2464 */
1967	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
1968	case IFT_L2VLAN:	/* ditto */
1969	case IFT_BRIDGE:	/* bridge(4) only does Ethernet-like links */
1970	case IFT_INFINIBAND:
1971		return (64);
1972	case IFT_FDDI:		/* RFC2467 */
1973		return (64);
1974	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
1975		return (64);
1976	case IFT_PPP:		/* RFC2472 */
1977		return (64);
1978	case IFT_ARCNET:	/* RFC2497 */
1979		return (64);
1980	case IFT_FRELAY:	/* RFC2590 */
1981		return (64);
1982	case IFT_IEEE1394:	/* RFC3146 */
1983		return (64);
1984	case IFT_GIF:
1985		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
1986	case IFT_LOOP:
1987		return (64);	/* XXX: is this really correct? */
1988	default:
1989		/*
1990		 * Unknown link type:
1991		 * It might be controversial to use the today's common constant
1992		 * of 64 for these cases unconditionally.  For full compliance,
1993		 * we should return an error in this case.  On the other hand,
1994		 * if we simply miss the standard for the link type or a new
1995		 * standard is defined for a new link type, the IFID length
1996		 * is very likely to be the common constant.  As a compromise,
1997		 * we always use the constant, but make an explicit notice
1998		 * indicating the "unknown" case.
1999		 */
2000		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2001		return (64);
2002	}
2003}
2004
2005#include <sys/sysctl.h>
2006
2007struct in6_llentry {
2008	struct llentry		base;
2009};
2010
2011#define	IN6_LLTBL_DEFAULT_HSIZE	32
2012#define	IN6_LLTBL_HASH(k, h) \
2013	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2014
2015/*
2016 * Do actual deallocation of @lle.
2017 */
2018static void
2019in6_lltable_destroy_lle_unlocked(struct llentry *lle)
2020{
2021
2022	LLE_LOCK_DESTROY(lle);
2023	LLE_REQ_DESTROY(lle);
2024	free(lle, M_LLTABLE);
2025}
2026
2027/*
2028 * Called by LLE_FREE_LOCKED when number of references
2029 * drops to zero.
2030 */
2031static void
2032in6_lltable_destroy_lle(struct llentry *lle)
2033{
2034
2035	LLE_WUNLOCK(lle);
2036	in6_lltable_destroy_lle_unlocked(lle);
2037}
2038
2039static struct llentry *
2040in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2041{
2042	struct in6_llentry *lle;
2043
2044	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2045	if (lle == NULL)		/* NB: caller generates msg */
2046		return NULL;
2047
2048	lle->base.r_l3addr.addr6 = *addr6;
2049	lle->base.lle_refcnt = 1;
2050	lle->base.lle_free = in6_lltable_destroy_lle;
2051	LLE_LOCK_INIT(&lle->base);
2052	LLE_REQ_INIT(&lle->base);
2053	callout_init(&lle->base.lle_timer, 1);
2054
2055	return (&lle->base);
2056}
2057
2058static int
2059in6_lltable_match_prefix(const struct sockaddr *saddr,
2060    const struct sockaddr *smask, u_int flags, struct llentry *lle)
2061{
2062	const struct in6_addr *addr, *mask, *lle_addr;
2063
2064	addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2065	mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2066	lle_addr = &lle->r_l3addr.addr6;
2067
2068	if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2069		return (0);
2070
2071	if (lle->la_flags & LLE_IFADDR) {
2072
2073		/*
2074		 * Delete LLE_IFADDR records IFF address & flag matches.
2075		 * Note that addr is the interface address within prefix
2076		 * being matched.
2077		 */
2078		if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2079		    (flags & LLE_STATIC) != 0)
2080			return (1);
2081		return (0);
2082	}
2083
2084	/* flags & LLE_STATIC means deleting both dynamic and static entries */
2085	if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2086		return (1);
2087
2088	return (0);
2089}
2090
2091static void
2092in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2093{
2094	struct ifnet *ifp;
2095
2096	LLE_WLOCK_ASSERT(lle);
2097	KASSERT(llt != NULL, ("lltable is NULL"));
2098
2099	/* Unlink entry from table */
2100	if ((lle->la_flags & LLE_LINKED) != 0) {
2101
2102		ifp = llt->llt_ifp;
2103		IF_AFDATA_WLOCK_ASSERT(ifp);
2104		lltable_unlink_entry(llt, lle);
2105	}
2106
2107	if (callout_stop(&lle->lle_timer) > 0)
2108		LLE_REMREF(lle);
2109
2110	llentry_free(lle);
2111}
2112
2113static int
2114in6_lltable_rtcheck(struct ifnet *ifp,
2115		    u_int flags,
2116		    const struct sockaddr *l3addr)
2117{
2118	const struct sockaddr_in6 *sin6;
2119	struct nhop6_basic nh6;
2120	struct in6_addr dst;
2121	uint32_t scopeid;
2122	int error;
2123	char ip6buf[INET6_ADDRSTRLEN];
2124	int fibnum;
2125
2126	KASSERT(l3addr->sa_family == AF_INET6,
2127	    ("sin_family %d", l3addr->sa_family));
2128
2129	sin6 = (const struct sockaddr_in6 *)l3addr;
2130	in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2131	fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib;
2132	error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6);
2133	if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
2134		struct ifaddr *ifa;
2135		/*
2136		 * Create an ND6 cache for an IPv6 neighbor
2137		 * that is not covered by our own prefix.
2138		 */
2139		ifa = ifaof_ifpforaddr(l3addr, ifp);
2140		if (ifa != NULL) {
2141			ifa_free(ifa);
2142			return 0;
2143		}
2144		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2145		    ip6_sprintf(ip6buf, &sin6->sin6_addr));
2146		return EINVAL;
2147	}
2148	return 0;
2149}
2150
2151static inline uint32_t
2152in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2153{
2154
2155	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2156}
2157
2158static uint32_t
2159in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2160{
2161
2162	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2163}
2164
2165static void
2166in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2167{
2168	struct sockaddr_in6 *sin6;
2169
2170	sin6 = (struct sockaddr_in6 *)sa;
2171	bzero(sin6, sizeof(*sin6));
2172	sin6->sin6_family = AF_INET6;
2173	sin6->sin6_len = sizeof(*sin6);
2174	sin6->sin6_addr = lle->r_l3addr.addr6;
2175}
2176
2177static inline struct llentry *
2178in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2179{
2180	struct llentry *lle;
2181	struct llentries *lleh;
2182	u_int hashidx;
2183
2184	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2185	lleh = &llt->lle_head[hashidx];
2186	LIST_FOREACH(lle, lleh, lle_next) {
2187		if (lle->la_flags & LLE_DELETED)
2188			continue;
2189		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2190			break;
2191	}
2192
2193	return (lle);
2194}
2195
2196static void
2197in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2198{
2199
2200	lle->la_flags |= LLE_DELETED;
2201	EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2202#ifdef DIAGNOSTIC
2203	log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2204#endif
2205	llentry_free(lle);
2206}
2207
2208static struct llentry *
2209in6_lltable_alloc(struct lltable *llt, u_int flags,
2210	const struct sockaddr *l3addr)
2211{
2212	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2213	struct ifnet *ifp = llt->llt_ifp;
2214	struct llentry *lle;
2215	char linkhdr[LLE_MAX_LINKHDR];
2216	size_t linkhdrsize;
2217	int lladdr_off;
2218
2219	KASSERT(l3addr->sa_family == AF_INET6,
2220	    ("sin_family %d", l3addr->sa_family));
2221
2222	/*
2223	 * A route that covers the given address must have
2224	 * been installed 1st because we are doing a resolution,
2225	 * verify this.
2226	 */
2227	if (!(flags & LLE_IFADDR) &&
2228	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2229		return (NULL);
2230
2231	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2232	if (lle == NULL) {
2233		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2234		return (NULL);
2235	}
2236	lle->la_flags = flags;
2237	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2238		linkhdrsize = LLE_MAX_LINKHDR;
2239		if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
2240		    linkhdr, &linkhdrsize, &lladdr_off) != 0) {
2241			in6_lltable_destroy_lle_unlocked(lle);
2242			return (NULL);
2243		}
2244		lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
2245		    lladdr_off);
2246		lle->la_flags |= LLE_STATIC;
2247	}
2248
2249	if ((lle->la_flags & LLE_STATIC) != 0)
2250		lle->ln_state = ND6_LLINFO_REACHABLE;
2251
2252	return (lle);
2253}
2254
2255static struct llentry *
2256in6_lltable_lookup(struct lltable *llt, u_int flags,
2257	const struct sockaddr *l3addr)
2258{
2259	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2260	struct llentry *lle;
2261
2262	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2263	KASSERT(l3addr->sa_family == AF_INET6,
2264	    ("sin_family %d", l3addr->sa_family));
2265
2266	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2267
2268	if (lle == NULL)
2269		return (NULL);
2270
2271	KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
2272	    (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
2273	    flags));
2274
2275	if (flags & LLE_UNLOCKED)
2276		return (lle);
2277
2278	if (flags & LLE_EXCLUSIVE)
2279		LLE_WLOCK(lle);
2280	else
2281		LLE_RLOCK(lle);
2282	return (lle);
2283}
2284
2285static int
2286in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2287    struct sysctl_req *wr)
2288{
2289	struct ifnet *ifp = llt->llt_ifp;
2290	/* XXX stack use */
2291	struct {
2292		struct rt_msghdr	rtm;
2293		struct sockaddr_in6	sin6;
2294		/*
2295		 * ndp.c assumes that sdl is word aligned
2296		 */
2297#ifdef __LP64__
2298		uint32_t		pad;
2299#endif
2300		struct sockaddr_dl	sdl;
2301	} ndpc;
2302	struct sockaddr_dl *sdl;
2303	int error;
2304
2305	bzero(&ndpc, sizeof(ndpc));
2306			/* skip deleted entries */
2307			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2308				return (0);
2309			/* Skip if jailed and not a valid IP of the prison. */
2310			lltable_fill_sa_entry(lle,
2311			    (struct sockaddr *)&ndpc.sin6);
2312			if (prison_if(wr->td->td_ucred,
2313			    (struct sockaddr *)&ndpc.sin6) != 0)
2314				return (0);
2315			/*
2316			 * produce a msg made of:
2317			 *  struct rt_msghdr;
2318			 *  struct sockaddr_in6 (IPv6)
2319			 *  struct sockaddr_dl;
2320			 */
2321			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2322			ndpc.rtm.rtm_version = RTM_VERSION;
2323			ndpc.rtm.rtm_type = RTM_GET;
2324			ndpc.rtm.rtm_flags = RTF_UP;
2325			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2326			if (V_deembed_scopeid)
2327				sa6_recoverscope(&ndpc.sin6);
2328
2329			/* publish */
2330			if (lle->la_flags & LLE_PUB)
2331				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2332
2333			sdl = &ndpc.sdl;
2334			sdl->sdl_family = AF_LINK;
2335			sdl->sdl_len = sizeof(*sdl);
2336			sdl->sdl_index = ifp->if_index;
2337			sdl->sdl_type = ifp->if_type;
2338			if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
2339				sdl->sdl_alen = ifp->if_addrlen;
2340				bcopy(lle->ll_addr, LLADDR(sdl),
2341				    ifp->if_addrlen);
2342			} else {
2343				sdl->sdl_alen = 0;
2344				bzero(LLADDR(sdl), ifp->if_addrlen);
2345			}
2346			if (lle->la_expire != 0)
2347				ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2348				    lle->lle_remtime / hz +
2349				    time_second - time_uptime;
2350			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2351			if (lle->la_flags & LLE_STATIC)
2352				ndpc.rtm.rtm_flags |= RTF_STATIC;
2353			if (lle->la_flags & LLE_IFADDR)
2354				ndpc.rtm.rtm_flags |= RTF_PINNED;
2355			if (lle->ln_router != 0)
2356				ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2357			ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2358			/* Store state in rmx_weight value */
2359			ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2360			ndpc.rtm.rtm_index = ifp->if_index;
2361			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2362
2363	return (error);
2364}
2365
2366static struct lltable *
2367in6_lltattach(struct ifnet *ifp)
2368{
2369	struct lltable *llt;
2370
2371	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2372	llt->llt_af = AF_INET6;
2373	llt->llt_ifp = ifp;
2374
2375	llt->llt_lookup = in6_lltable_lookup;
2376	llt->llt_alloc_entry = in6_lltable_alloc;
2377	llt->llt_delete_entry = in6_lltable_delete_entry;
2378	llt->llt_dump_entry = in6_lltable_dump_entry;
2379	llt->llt_hash = in6_lltable_hash;
2380	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2381	llt->llt_free_entry = in6_lltable_free_entry;
2382	llt->llt_match_prefix = in6_lltable_match_prefix;
2383 	lltable_link(llt);
2384
2385	return (llt);
2386}
2387
2388void *
2389in6_domifattach(struct ifnet *ifp)
2390{
2391	struct in6_ifextra *ext;
2392
2393	/* There are not IPv6-capable interfaces. */
2394	switch (ifp->if_type) {
2395	case IFT_PFLOG:
2396	case IFT_PFSYNC:
2397	case IFT_USB:
2398		return (NULL);
2399	}
2400	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2401	bzero(ext, sizeof(*ext));
2402
2403	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2404	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2405	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2406	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2407
2408	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2409	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2410	    M_WAITOK);
2411	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2412	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2413
2414	ext->nd_ifinfo = nd6_ifattach(ifp);
2415	ext->scope6_id = scope6_ifattach(ifp);
2416	ext->lltable = in6_lltattach(ifp);
2417
2418	ext->mld_ifinfo = mld_domifattach(ifp);
2419
2420	return ext;
2421}
2422
2423int
2424in6_domifmtu(struct ifnet *ifp)
2425{
2426	if (ifp->if_afdata[AF_INET6] == NULL)
2427		return ifp->if_mtu;
2428
2429	return (IN6_LINKMTU(ifp));
2430}
2431
2432void
2433in6_domifdetach(struct ifnet *ifp, void *aux)
2434{
2435	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2436
2437	mld_domifdetach(ifp);
2438	scope6_ifdetach(ext->scope6_id);
2439	nd6_ifdetach(ifp, ext->nd_ifinfo);
2440	lltable_free(ext->lltable);
2441	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2442	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2443	free(ext->in6_ifstat, M_IFADDR);
2444	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2445	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2446	free(ext->icmp6_ifstat, M_IFADDR);
2447	free(ext, M_IFADDR);
2448}
2449
2450/*
2451 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2452 * v4 mapped addr or v4 compat addr
2453 */
2454void
2455in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2456{
2457
2458	bzero(sin, sizeof(*sin));
2459	sin->sin_len = sizeof(struct sockaddr_in);
2460	sin->sin_family = AF_INET;
2461	sin->sin_port = sin6->sin6_port;
2462	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2463}
2464
2465/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2466void
2467in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2468{
2469	bzero(sin6, sizeof(*sin6));
2470	sin6->sin6_len = sizeof(struct sockaddr_in6);
2471	sin6->sin6_family = AF_INET6;
2472	sin6->sin6_port = sin->sin_port;
2473	sin6->sin6_addr.s6_addr32[0] = 0;
2474	sin6->sin6_addr.s6_addr32[1] = 0;
2475	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2476	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2477}
2478
2479/* Convert sockaddr_in6 into sockaddr_in. */
2480void
2481in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2482{
2483	struct sockaddr_in *sin_p;
2484	struct sockaddr_in6 sin6;
2485
2486	/*
2487	 * Save original sockaddr_in6 addr and convert it
2488	 * to sockaddr_in.
2489	 */
2490	sin6 = *(struct sockaddr_in6 *)nam;
2491	sin_p = (struct sockaddr_in *)nam;
2492	in6_sin6_2_sin(sin_p, &sin6);
2493}
2494
2495/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2496void
2497in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2498{
2499	struct sockaddr_in *sin_p;
2500	struct sockaddr_in6 *sin6_p;
2501
2502	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2503	sin_p = (struct sockaddr_in *)*nam;
2504	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2505	free(*nam, M_SONAME);
2506	*nam = (struct sockaddr *)sin6_p;
2507}
2508