in6.c revision d1b74add9a9ee8e208448aa1958ca9d1ca709aa0
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 * 3. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 *	@(#)in.c	8.2 (Berkeley) 11/15/93
61 */
62
63#include <sys/cdefs.h>
64__FBSDID("$FreeBSD$");
65
66#include "opt_compat.h"
67#include "opt_inet.h"
68#include "opt_inet6.h"
69
70#include <sys/param.h>
71#include <sys/eventhandler.h>
72#include <sys/errno.h>
73#include <sys/jail.h>
74#include <sys/malloc.h>
75#include <sys/socket.h>
76#include <sys/socketvar.h>
77#include <sys/sockio.h>
78#include <sys/systm.h>
79#include <sys/priv.h>
80#include <sys/proc.h>
81#include <sys/time.h>
82#include <sys/kernel.h>
83#include <sys/lock.h>
84#include <sys/rmlock.h>
85#include <sys/syslog.h>
86
87#include <net/if.h>
88#include <net/if_var.h>
89#include <net/if_types.h>
90#include <net/route.h>
91#include <net/if_dl.h>
92#include <net/vnet.h>
93
94#include <netinet/in.h>
95#include <netinet/in_var.h>
96#include <net/if_llatbl.h>
97#include <netinet/if_ether.h>
98#include <netinet/in_systm.h>
99#include <netinet/ip.h>
100#include <netinet/in_pcb.h>
101#include <netinet/ip_carp.h>
102
103#include <netinet/ip6.h>
104#include <netinet6/ip6_var.h>
105#include <netinet6/nd6.h>
106#include <netinet6/mld6_var.h>
107#include <netinet6/ip6_mroute.h>
108#include <netinet6/in6_ifattach.h>
109#include <netinet6/scope6_var.h>
110#include <netinet6/in6_fib.h>
111#include <netinet6/in6_pcb.h>
112
113VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
114#define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
115
116/*
117 * Definitions of some costant IP6 addresses.
118 */
119const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
120const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
121const struct in6_addr in6addr_nodelocal_allnodes =
122	IN6ADDR_NODELOCAL_ALLNODES_INIT;
123const struct in6_addr in6addr_linklocal_allnodes =
124	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
125const struct in6_addr in6addr_linklocal_allrouters =
126	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
127const struct in6_addr in6addr_linklocal_allv2routers =
128	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
129
130const struct in6_addr in6mask0 = IN6MASK0;
131const struct in6_addr in6mask32 = IN6MASK32;
132const struct in6_addr in6mask64 = IN6MASK64;
133const struct in6_addr in6mask96 = IN6MASK96;
134const struct in6_addr in6mask128 = IN6MASK128;
135
136const struct sockaddr_in6 sa6_any =
137	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
138
139static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
140	struct in6_aliasreq *, int);
141static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
142
143static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
144    struct in6_ifaddr *, int);
145static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
146    struct in6_aliasreq *, int flags);
147static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
148    struct in6_ifaddr *, int, int);
149static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
150    struct in6_ifaddr *, int);
151
152#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
153#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
154
155
156void
157in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
158{
159	struct sockaddr_dl gateway;
160	struct sockaddr_in6 mask, addr;
161	struct rtentry rt;
162	int fibnum;
163
164	/*
165	 * initialize for rtmsg generation
166	 */
167	bzero(&gateway, sizeof(gateway));
168	gateway.sdl_len = sizeof(gateway);
169	gateway.sdl_family = AF_LINK;
170
171	bzero(&rt, sizeof(rt));
172	rt.rt_gateway = (struct sockaddr *)&gateway;
173	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
174	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
175	rt_mask(&rt) = (struct sockaddr *)&mask;
176	rt_key(&rt) = (struct sockaddr *)&addr;
177	rt.rt_flags = RTF_HOST | RTF_STATIC;
178	if (cmd == RTM_ADD)
179		rt.rt_flags |= RTF_UP;
180	fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib;
181	/* Announce arrival of local address to this FIB. */
182	rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum);
183}
184
185int
186in6_mask2len(struct in6_addr *mask, u_char *lim0)
187{
188	int x = 0, y;
189	u_char *lim = lim0, *p;
190
191	/* ignore the scope_id part */
192	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
193		lim = (u_char *)mask + sizeof(*mask);
194	for (p = (u_char *)mask; p < lim; x++, p++) {
195		if (*p != 0xff)
196			break;
197	}
198	y = 0;
199	if (p < lim) {
200		for (y = 0; y < 8; y++) {
201			if ((*p & (0x80 >> y)) == 0)
202				break;
203		}
204	}
205
206	/*
207	 * when the limit pointer is given, do a stricter check on the
208	 * remaining bits.
209	 */
210	if (p < lim) {
211		if (y != 0 && (*p & (0x00ff >> y)) != 0)
212			return (-1);
213		for (p = p + 1; p < lim; p++)
214			if (*p != 0)
215				return (-1);
216	}
217
218	return x * 8 + y;
219}
220
221#ifdef COMPAT_FREEBSD32
222struct in6_ndifreq32 {
223	char ifname[IFNAMSIZ];
224	uint32_t ifindex;
225};
226#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
227#endif
228
229int
230in6_control(struct socket *so, u_long cmd, caddr_t data,
231    struct ifnet *ifp, struct thread *td)
232{
233	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
234	struct	in6_ifaddr *ia = NULL;
235	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
236	struct sockaddr_in6 *sa6;
237	int carp_attached = 0;
238	int error;
239	u_long ocmd = cmd;
240
241	/*
242	 * Compat to make pre-10.x ifconfig(8) operable.
243	 */
244	if (cmd == OSIOCAIFADDR_IN6)
245		cmd = SIOCAIFADDR_IN6;
246
247	switch (cmd) {
248	case SIOCGETSGCNT_IN6:
249	case SIOCGETMIFCNT_IN6:
250		/*
251		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
252		 * We cannot see how that would be needed, so do not adjust the
253		 * KPI blindly; more likely should clean up the IPv4 variant.
254		 */
255		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
256	}
257
258	switch (cmd) {
259	case SIOCAADDRCTL_POLICY:
260	case SIOCDADDRCTL_POLICY:
261		if (td != NULL) {
262			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
263			if (error)
264				return (error);
265		}
266		return (in6_src_ioctl(cmd, data));
267	}
268
269	if (ifp == NULL)
270		return (EOPNOTSUPP);
271
272	switch (cmd) {
273	case SIOCSNDFLUSH_IN6:
274	case SIOCSPFXFLUSH_IN6:
275	case SIOCSRTRFLUSH_IN6:
276	case SIOCSDEFIFACE_IN6:
277	case SIOCSIFINFO_FLAGS:
278	case SIOCSIFINFO_IN6:
279		if (td != NULL) {
280			error = priv_check(td, PRIV_NETINET_ND6);
281			if (error)
282				return (error);
283		}
284		/* FALLTHROUGH */
285	case OSIOCGIFINFO_IN6:
286	case SIOCGIFINFO_IN6:
287	case SIOCGNBRINFO_IN6:
288	case SIOCGDEFIFACE_IN6:
289		return (nd6_ioctl(cmd, data, ifp));
290
291#ifdef COMPAT_FREEBSD32
292	case SIOCGDEFIFACE32_IN6:
293		{
294			struct in6_ndifreq ndif;
295			struct in6_ndifreq32 *ndif32;
296
297			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
298			    ifp);
299			if (error)
300				return (error);
301			ndif32 = (struct in6_ndifreq32 *)data;
302			ndif32->ifindex = ndif.ifindex;
303			return (0);
304		}
305#endif
306	}
307
308	switch (cmd) {
309	case SIOCSIFPREFIX_IN6:
310	case SIOCDIFPREFIX_IN6:
311	case SIOCAIFPREFIX_IN6:
312	case SIOCCIFPREFIX_IN6:
313	case SIOCSGIFPREFIX_IN6:
314	case SIOCGIFPREFIX_IN6:
315		log(LOG_NOTICE,
316		    "prefix ioctls are now invalidated. "
317		    "please use ifconfig.\n");
318		return (EOPNOTSUPP);
319	}
320
321	switch (cmd) {
322	case SIOCSSCOPE6:
323		if (td != NULL) {
324			error = priv_check(td, PRIV_NETINET_SCOPE6);
325			if (error)
326				return (error);
327		}
328		/* FALLTHROUGH */
329	case SIOCGSCOPE6:
330	case SIOCGSCOPE6DEF:
331		return (scope6_ioctl(cmd, data, ifp));
332	}
333
334	/*
335	 * Find address for this interface, if it exists.
336	 *
337	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
338	 * only, and used the first interface address as the target of other
339	 * operations (without checking ifra_addr).  This was because netinet
340	 * code/API assumed at most 1 interface address per interface.
341	 * Since IPv6 allows a node to assign multiple addresses
342	 * on a single interface, we almost always look and check the
343	 * presence of ifra_addr, and reject invalid ones here.
344	 * It also decreases duplicated code among SIOC*_IN6 operations.
345	 */
346	switch (cmd) {
347	case SIOCAIFADDR_IN6:
348	case SIOCSIFPHYADDR_IN6:
349		sa6 = &ifra->ifra_addr;
350		break;
351	case SIOCSIFADDR_IN6:
352	case SIOCGIFADDR_IN6:
353	case SIOCSIFDSTADDR_IN6:
354	case SIOCSIFNETMASK_IN6:
355	case SIOCGIFDSTADDR_IN6:
356	case SIOCGIFNETMASK_IN6:
357	case SIOCDIFADDR_IN6:
358	case SIOCGIFPSRCADDR_IN6:
359	case SIOCGIFPDSTADDR_IN6:
360	case SIOCGIFAFLAG_IN6:
361	case SIOCSNDFLUSH_IN6:
362	case SIOCSPFXFLUSH_IN6:
363	case SIOCSRTRFLUSH_IN6:
364	case SIOCGIFALIFETIME_IN6:
365	case SIOCGIFSTAT_IN6:
366	case SIOCGIFSTAT_ICMP6:
367		sa6 = &ifr->ifr_addr;
368		break;
369	case SIOCSIFADDR:
370	case SIOCSIFBRDADDR:
371	case SIOCSIFDSTADDR:
372	case SIOCSIFNETMASK:
373		/*
374		 * Although we should pass any non-INET6 ioctl requests
375		 * down to driver, we filter some legacy INET requests.
376		 * Drivers trust SIOCSIFADDR et al to come from an already
377		 * privileged layer, and do not perform any credentials
378		 * checks or input validation.
379		 */
380		return (EINVAL);
381	default:
382		sa6 = NULL;
383		break;
384	}
385	if (sa6 && sa6->sin6_family == AF_INET6) {
386		if (sa6->sin6_scope_id != 0)
387			error = sa6_embedscope(sa6, 0);
388		else
389			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
390		if (error != 0)
391			return (error);
392		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
393		    &sa6->sin6_addr)) != 0)
394			return (error);
395		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
396	} else
397		ia = NULL;
398
399	switch (cmd) {
400	case SIOCSIFADDR_IN6:
401	case SIOCSIFDSTADDR_IN6:
402	case SIOCSIFNETMASK_IN6:
403		/*
404		 * Since IPv6 allows a node to assign multiple addresses
405		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
406		 */
407		/* we decided to obsolete this command (20000704) */
408		error = EINVAL;
409		goto out;
410
411	case SIOCDIFADDR_IN6:
412		/*
413		 * for IPv4, we look for existing in_ifaddr here to allow
414		 * "ifconfig if0 delete" to remove the first IPv4 address on
415		 * the interface.  For IPv6, as the spec allows multiple
416		 * interface address from the day one, we consider "remove the
417		 * first one" semantics to be not preferable.
418		 */
419		if (ia == NULL) {
420			error = EADDRNOTAVAIL;
421			goto out;
422		}
423		/* FALLTHROUGH */
424	case SIOCAIFADDR_IN6:
425		/*
426		 * We always require users to specify a valid IPv6 address for
427		 * the corresponding operation.
428		 */
429		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
430		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
431			error = EAFNOSUPPORT;
432			goto out;
433		}
434
435		if (td != NULL) {
436			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
437			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
438			if (error)
439				goto out;
440		}
441		/* FALLTHROUGH */
442	case SIOCGIFSTAT_IN6:
443	case SIOCGIFSTAT_ICMP6:
444		if (ifp->if_afdata[AF_INET6] == NULL) {
445			error = EPFNOSUPPORT;
446			goto out;
447		}
448		break;
449
450	case SIOCGIFADDR_IN6:
451		/* This interface is basically deprecated. use SIOCGIFCONF. */
452		/* FALLTHROUGH */
453	case SIOCGIFAFLAG_IN6:
454	case SIOCGIFNETMASK_IN6:
455	case SIOCGIFDSTADDR_IN6:
456	case SIOCGIFALIFETIME_IN6:
457		/* must think again about its semantics */
458		if (ia == NULL) {
459			error = EADDRNOTAVAIL;
460			goto out;
461		}
462		break;
463	}
464
465	switch (cmd) {
466	case SIOCGIFADDR_IN6:
467		ifr->ifr_addr = ia->ia_addr;
468		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
469			goto out;
470		break;
471
472	case SIOCGIFDSTADDR_IN6:
473		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
474			error = EINVAL;
475			goto out;
476		}
477		/*
478		 * XXX: should we check if ifa_dstaddr is NULL and return
479		 * an error?
480		 */
481		ifr->ifr_dstaddr = ia->ia_dstaddr;
482		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
483			goto out;
484		break;
485
486	case SIOCGIFNETMASK_IN6:
487		ifr->ifr_addr = ia->ia_prefixmask;
488		break;
489
490	case SIOCGIFAFLAG_IN6:
491		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
492		break;
493
494	case SIOCGIFSTAT_IN6:
495		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
496		    ifp->if_afdata[AF_INET6])->in6_ifstat,
497		    &ifr->ifr_ifru.ifru_stat,
498		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
499		break;
500
501	case SIOCGIFSTAT_ICMP6:
502		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
503		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
504		    &ifr->ifr_ifru.ifru_icmp6stat,
505		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
506		break;
507
508	case SIOCGIFALIFETIME_IN6:
509		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
510		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
511			time_t maxexpire;
512			struct in6_addrlifetime *retlt =
513			    &ifr->ifr_ifru.ifru_lifetime;
514
515			/*
516			 * XXX: adjust expiration time assuming time_t is
517			 * signed.
518			 */
519			maxexpire = (-1) &
520			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
521			if (ia->ia6_lifetime.ia6t_vltime <
522			    maxexpire - ia->ia6_updatetime) {
523				retlt->ia6t_expire = ia->ia6_updatetime +
524				    ia->ia6_lifetime.ia6t_vltime;
525			} else
526				retlt->ia6t_expire = maxexpire;
527		}
528		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
529			time_t maxexpire;
530			struct in6_addrlifetime *retlt =
531			    &ifr->ifr_ifru.ifru_lifetime;
532
533			/*
534			 * XXX: adjust expiration time assuming time_t is
535			 * signed.
536			 */
537			maxexpire = (-1) &
538			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
539			if (ia->ia6_lifetime.ia6t_pltime <
540			    maxexpire - ia->ia6_updatetime) {
541				retlt->ia6t_preferred = ia->ia6_updatetime +
542				    ia->ia6_lifetime.ia6t_pltime;
543			} else
544				retlt->ia6t_preferred = maxexpire;
545		}
546		break;
547
548	case SIOCAIFADDR_IN6:
549	{
550		struct nd_prefixctl pr0;
551		struct nd_prefix *pr;
552
553		/*
554		 * first, make or update the interface address structure,
555		 * and link it to the list.
556		 */
557		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
558			goto out;
559		if (ia != NULL) {
560			if (ia->ia_ifa.ifa_carp)
561				(*carp_detach_p)(&ia->ia_ifa, true);
562			ifa_free(&ia->ia_ifa);
563		}
564		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
565		    == NULL) {
566			/*
567			 * this can happen when the user specify the 0 valid
568			 * lifetime.
569			 */
570			break;
571		}
572
573		if (cmd == ocmd && ifra->ifra_vhid > 0) {
574			if (carp_attach_p != NULL)
575				error = (*carp_attach_p)(&ia->ia_ifa,
576				    ifra->ifra_vhid);
577			else
578				error = EPROTONOSUPPORT;
579			if (error)
580				goto out;
581			else
582				carp_attached = 1;
583		}
584
585		/*
586		 * then, make the prefix on-link on the interface.
587		 * XXX: we'd rather create the prefix before the address, but
588		 * we need at least one address to install the corresponding
589		 * interface route, so we configure the address first.
590		 */
591
592		/*
593		 * convert mask to prefix length (prefixmask has already
594		 * been validated in in6_update_ifa().
595		 */
596		bzero(&pr0, sizeof(pr0));
597		pr0.ndpr_ifp = ifp;
598		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
599		    NULL);
600		if (pr0.ndpr_plen == 128) {
601			/* we don't need to install a host route. */
602			goto aifaddr_out;
603		}
604		pr0.ndpr_prefix = ifra->ifra_addr;
605		/* apply the mask for safety. */
606		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
607		    &ifra->ifra_prefixmask.sin6_addr);
608
609		/*
610		 * XXX: since we don't have an API to set prefix (not address)
611		 * lifetimes, we just use the same lifetimes as addresses.
612		 * The (temporarily) installed lifetimes can be overridden by
613		 * later advertised RAs (when accept_rtadv is non 0), which is
614		 * an intended behavior.
615		 */
616		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
617		pr0.ndpr_raf_auto =
618		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
619		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
620		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
621
622		/* add the prefix if not yet. */
623		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
624			/*
625			 * nd6_prelist_add will install the corresponding
626			 * interface route.
627			 */
628			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
629				if (carp_attached)
630					(*carp_detach_p)(&ia->ia_ifa, false);
631				goto out;
632			}
633		}
634
635		/* relate the address to the prefix */
636		if (ia->ia6_ndpr == NULL) {
637			ia->ia6_ndpr = pr;
638			pr->ndpr_addrcnt++;
639
640			/*
641			 * If this is the first autoconf address from the
642			 * prefix, create a temporary address as well
643			 * (when required).
644			 */
645			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
646			    V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
647				int e;
648				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
649					log(LOG_NOTICE, "in6_control: failed "
650					    "to create a temporary address, "
651					    "errno=%d\n", e);
652				}
653			}
654		}
655		nd6_prefix_rele(pr);
656
657		/*
658		 * this might affect the status of autoconfigured addresses,
659		 * that is, this address might make other addresses detached.
660		 */
661		pfxlist_onlink_check();
662
663aifaddr_out:
664		/*
665		 * Try to clear the flag when a new IPv6 address is added
666		 * onto an IFDISABLED interface and it succeeds.
667		 */
668		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
669			struct in6_ndireq nd;
670
671			memset(&nd, 0, sizeof(nd));
672			nd.ndi.flags = ND_IFINFO(ifp)->flags;
673			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
674			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
675				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
676				    "SIOCSIFINFO_FLAGS for -ifdisabled "
677				    "failed.");
678			/*
679			 * Ignore failure of clearing the flag intentionally.
680			 * The failure means address duplication was detected.
681			 */
682		}
683		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
684		break;
685	}
686
687	case SIOCDIFADDR_IN6:
688	{
689		struct nd_prefix *pr;
690
691		/*
692		 * If the address being deleted is the only one that owns
693		 * the corresponding prefix, expire the prefix as well.
694		 * XXX: theoretically, we don't have to worry about such
695		 * relationship, since we separate the address management
696		 * and the prefix management.  We do this, however, to provide
697		 * as much backward compatibility as possible in terms of
698		 * the ioctl operation.
699		 * Note that in6_purgeaddr() will decrement ndpr_addrcnt.
700		 */
701		pr = ia->ia6_ndpr;
702		in6_purgeaddr(&ia->ia_ifa);
703		if (pr != NULL && pr->ndpr_addrcnt == 0) {
704			ND6_WLOCK();
705			nd6_prefix_unlink(pr, NULL);
706			ND6_WUNLOCK();
707			nd6_prefix_del(pr);
708		}
709		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
710		break;
711	}
712
713	default:
714		if (ifp->if_ioctl == NULL) {
715			error = EOPNOTSUPP;
716			goto out;
717		}
718		error = (*ifp->if_ioctl)(ifp, cmd, data);
719		goto out;
720	}
721
722	error = 0;
723out:
724	if (ia != NULL)
725		ifa_free(&ia->ia_ifa);
726	return (error);
727}
728
729
730/*
731 * Join necessary multicast groups.  Factored out from in6_update_ifa().
732 * This entire work should only be done once, for the default FIB.
733 */
734static int
735in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
736    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
737{
738	char ip6buf[INET6_ADDRSTRLEN];
739	struct in6_addr mltaddr;
740	struct in6_multi_mship *imm;
741	int delay, error;
742
743	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
744
745	/* Join solicited multicast addr for new host id. */
746	bzero(&mltaddr, sizeof(struct in6_addr));
747	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
748	mltaddr.s6_addr32[2] = htonl(1);
749	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
750	mltaddr.s6_addr8[12] = 0xff;
751	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
752		/* XXX: should not happen */
753		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
754		goto cleanup;
755	}
756	delay = error = 0;
757	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
758		/*
759		 * We need a random delay for DAD on the address being
760		 * configured.  It also means delaying transmission of the
761		 * corresponding MLD report to avoid report collision.
762		 * [RFC 4861, Section 6.3.7]
763		 */
764		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
765	}
766	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
767	if (imm == NULL) {
768		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
769		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
770		    if_name(ifp), error));
771		goto cleanup;
772	}
773	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
774	*in6m_sol = imm->i6mm_maddr;
775
776	/*
777	 * Join link-local all-nodes address.
778	 */
779	mltaddr = in6addr_linklocal_allnodes;
780	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
781		goto cleanup; /* XXX: should not fail */
782
783	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
784	if (imm == NULL) {
785		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
786		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
787		    if_name(ifp), error));
788		goto cleanup;
789	}
790	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
791
792	/*
793	 * Join node information group address.
794	 */
795	delay = 0;
796	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
797		/*
798		 * The spec does not say anything about delay for this group,
799		 * but the same logic should apply.
800		 */
801		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
802	}
803	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
804		/* XXX jinmei */
805		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
806		if (imm == NULL)
807			nd6log((LOG_WARNING,
808			    "%s: in6_joingroup failed for %s on %s "
809			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
810			    &mltaddr), if_name(ifp), error));
811			/* XXX not very fatal, go on... */
812		else
813			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
814	}
815	if (V_icmp6_nodeinfo_oldmcprefix &&
816	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
817		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
818		if (imm == NULL)
819			nd6log((LOG_WARNING,
820			    "%s: in6_joingroup failed for %s on %s "
821			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
822			    &mltaddr), if_name(ifp), error));
823			/* XXX not very fatal, go on... */
824		else
825			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
826	}
827
828	/*
829	 * Join interface-local all-nodes address.
830	 * (ff01::1%ifN, and ff01::%ifN/32)
831	 */
832	mltaddr = in6addr_nodelocal_allnodes;
833	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
834		goto cleanup; /* XXX: should not fail */
835
836	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
837	if (imm == NULL) {
838		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
839		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
840		    &mltaddr), if_name(ifp), error));
841		goto cleanup;
842	}
843	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
844
845cleanup:
846	return (error);
847}
848
849/*
850 * Update parameters of an IPv6 interface address.
851 * If necessary, a new entry is created and linked into address chains.
852 * This function is separated from in6_control().
853 */
854int
855in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
856    struct in6_ifaddr *ia, int flags)
857{
858	int error, hostIsNew = 0;
859
860	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
861		return (error);
862
863	if (ia == NULL) {
864		hostIsNew = 1;
865		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
866			return (ENOBUFS);
867	}
868
869	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
870	if (error != 0) {
871		if (hostIsNew != 0) {
872			in6_unlink_ifa(ia, ifp);
873			ifa_free(&ia->ia_ifa);
874		}
875		return (error);
876	}
877
878	if (hostIsNew)
879		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
880
881	return (error);
882}
883
884/*
885 * Fill in basic IPv6 address request info.
886 */
887void
888in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
889    const struct in6_addr *mask)
890{
891
892	memset(ifra, 0, sizeof(struct in6_aliasreq));
893
894	ifra->ifra_addr.sin6_family = AF_INET6;
895	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
896	if (addr != NULL)
897		ifra->ifra_addr.sin6_addr = *addr;
898
899	ifra->ifra_prefixmask.sin6_family = AF_INET6;
900	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
901	if (mask != NULL)
902		ifra->ifra_prefixmask.sin6_addr = *mask;
903}
904
905static int
906in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
907    struct in6_ifaddr *ia, int flags)
908{
909	int plen = -1;
910	struct sockaddr_in6 dst6;
911	struct in6_addrlifetime *lt;
912	char ip6buf[INET6_ADDRSTRLEN];
913
914	/* Validate parameters */
915	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
916		return (EINVAL);
917
918	/*
919	 * The destination address for a p2p link must have a family
920	 * of AF_UNSPEC or AF_INET6.
921	 */
922	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
923	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
924	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
925		return (EAFNOSUPPORT);
926
927	/*
928	 * Validate address
929	 */
930	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
931	    ifra->ifra_addr.sin6_family != AF_INET6)
932		return (EINVAL);
933
934	/*
935	 * validate ifra_prefixmask.  don't check sin6_family, netmask
936	 * does not carry fields other than sin6_len.
937	 */
938	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
939		return (EINVAL);
940	/*
941	 * Because the IPv6 address architecture is classless, we require
942	 * users to specify a (non 0) prefix length (mask) for a new address.
943	 * We also require the prefix (when specified) mask is valid, and thus
944	 * reject a non-consecutive mask.
945	 */
946	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
947		return (EINVAL);
948	if (ifra->ifra_prefixmask.sin6_len != 0) {
949		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
950		    (u_char *)&ifra->ifra_prefixmask +
951		    ifra->ifra_prefixmask.sin6_len);
952		if (plen <= 0)
953			return (EINVAL);
954	} else {
955		/*
956		 * In this case, ia must not be NULL.  We just use its prefix
957		 * length.
958		 */
959		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
960	}
961	/*
962	 * If the destination address on a p2p interface is specified,
963	 * and the address is a scoped one, validate/set the scope
964	 * zone identifier.
965	 */
966	dst6 = ifra->ifra_dstaddr;
967	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
968	    (dst6.sin6_family == AF_INET6)) {
969		struct in6_addr in6_tmp;
970		u_int32_t zoneid;
971
972		in6_tmp = dst6.sin6_addr;
973		if (in6_setscope(&in6_tmp, ifp, &zoneid))
974			return (EINVAL); /* XXX: should be impossible */
975
976		if (dst6.sin6_scope_id != 0) {
977			if (dst6.sin6_scope_id != zoneid)
978				return (EINVAL);
979		} else		/* user omit to specify the ID. */
980			dst6.sin6_scope_id = zoneid;
981
982		/* convert into the internal form */
983		if (sa6_embedscope(&dst6, 0))
984			return (EINVAL); /* XXX: should be impossible */
985	}
986	/* Modify original ifra_dstaddr to reflect changes */
987	ifra->ifra_dstaddr = dst6;
988
989	/*
990	 * The destination address can be specified only for a p2p or a
991	 * loopback interface.  If specified, the corresponding prefix length
992	 * must be 128.
993	 */
994	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
995		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
996			/* XXX: noisy message */
997			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
998			    "be specified for a p2p or a loopback IF only\n"));
999			return (EINVAL);
1000		}
1001		if (plen != 128) {
1002			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1003			    "be 128 when dstaddr is specified\n"));
1004			return (EINVAL);
1005		}
1006	}
1007	/* lifetime consistency check */
1008	lt = &ifra->ifra_lifetime;
1009	if (lt->ia6t_pltime > lt->ia6t_vltime)
1010		return (EINVAL);
1011	if (lt->ia6t_vltime == 0) {
1012		/*
1013		 * the following log might be noisy, but this is a typical
1014		 * configuration mistake or a tool's bug.
1015		 */
1016		nd6log((LOG_INFO,
1017		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1018		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1019
1020		if (ia == NULL)
1021			return (0); /* there's nothing to do */
1022	}
1023
1024	/* Check prefix mask */
1025	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1026		/*
1027		 * We prohibit changing the prefix length of an existing
1028		 * address, because
1029		 * + such an operation should be rare in IPv6, and
1030		 * + the operation would confuse prefix management.
1031		 */
1032		if (ia->ia_prefixmask.sin6_len != 0 &&
1033		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1034			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1035			    "of an existing %s address should not be changed\n",
1036			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1037
1038			return (EINVAL);
1039		}
1040	}
1041
1042	return (0);
1043}
1044
1045
1046/*
1047 * Allocate a new ifaddr and link it into chains.
1048 */
1049static struct in6_ifaddr *
1050in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1051{
1052	struct in6_ifaddr *ia;
1053
1054	/*
1055	 * When in6_alloc_ifa() is called in a process of a received
1056	 * RA, it is called under an interrupt context.  So, we should
1057	 * call malloc with M_NOWAIT.
1058	 */
1059	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1060	if (ia == NULL)
1061		return (NULL);
1062	LIST_INIT(&ia->ia6_memberships);
1063	/* Initialize the address and masks, and put time stamp */
1064	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1065	ia->ia_addr.sin6_family = AF_INET6;
1066	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1067	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1068	ia->ia_addr = ifra->ifra_addr;
1069	ia->ia6_createtime = time_uptime;
1070	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1071		/*
1072		 * Some functions expect that ifa_dstaddr is not
1073		 * NULL for p2p interfaces.
1074		 */
1075		ia->ia_ifa.ifa_dstaddr =
1076		    (struct sockaddr *)&ia->ia_dstaddr;
1077	} else {
1078		ia->ia_ifa.ifa_dstaddr = NULL;
1079	}
1080
1081	/* set prefix mask if any */
1082	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1083	if (ifra->ifra_prefixmask.sin6_len != 0) {
1084		ia->ia_prefixmask.sin6_family = AF_INET6;
1085		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1086		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1087	}
1088
1089	ia->ia_ifp = ifp;
1090	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1091	IF_ADDR_WLOCK(ifp);
1092	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1093	IF_ADDR_WUNLOCK(ifp);
1094
1095	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1096	IN6_IFADDR_WLOCK();
1097	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1098	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1099	IN6_IFADDR_WUNLOCK();
1100
1101	return (ia);
1102}
1103
1104/*
1105 * Update/configure interface address parameters:
1106 *
1107 * 1) Update lifetime
1108 * 2) Update interface metric ad flags
1109 * 3) Notify other subsystems
1110 */
1111static int
1112in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1113    struct in6_ifaddr *ia, int hostIsNew, int flags)
1114{
1115	int error;
1116
1117	/* update timestamp */
1118	ia->ia6_updatetime = time_uptime;
1119
1120	/*
1121	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1122	 * to see if the address is deprecated or invalidated, but initialize
1123	 * these members for applications.
1124	 */
1125	ia->ia6_lifetime = ifra->ifra_lifetime;
1126	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1127		ia->ia6_lifetime.ia6t_expire =
1128		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1129	} else
1130		ia->ia6_lifetime.ia6t_expire = 0;
1131	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1132		ia->ia6_lifetime.ia6t_preferred =
1133		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1134	} else
1135		ia->ia6_lifetime.ia6t_preferred = 0;
1136
1137	/*
1138	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1139	 * userland, make it deprecated.
1140	 */
1141	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1142		ia->ia6_lifetime.ia6t_pltime = 0;
1143		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1144	}
1145
1146	/*
1147	 * configure address flags.
1148	 */
1149	ia->ia6_flags = ifra->ifra_flags;
1150
1151	/*
1152	 * Make the address tentative before joining multicast addresses,
1153	 * so that corresponding MLD responses would not have a tentative
1154	 * source address.
1155	 */
1156	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1157
1158	/*
1159	 * DAD should be performed for an new address or addresses on
1160	 * an interface with ND6_IFF_IFDISABLED.
1161	 */
1162	if (in6if_do_dad(ifp) &&
1163	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1164		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1165
1166	/* notify other subsystems */
1167	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1168
1169	return (error);
1170}
1171
1172/*
1173 * Do link-level ifa job:
1174 * 1) Add lle entry for added address
1175 * 2) Notifies routing socket users about new address
1176 * 3) join appropriate multicast group
1177 * 4) start DAD if enabled
1178 */
1179static int
1180in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1181    struct in6_ifaddr *ia, int flags)
1182{
1183	struct in6_multi *in6m_sol;
1184	int error = 0;
1185
1186	/* Add local address to lltable, if necessary (ex. on p2p link). */
1187	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1188		in6_purgeaddr(&ia->ia_ifa);
1189		ifa_free(&ia->ia_ifa);
1190		return (error);
1191	}
1192
1193	/* Join necessary multicast groups. */
1194	in6m_sol = NULL;
1195	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1196		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1197		if (error != 0) {
1198			in6_purgeaddr(&ia->ia_ifa);
1199			ifa_free(&ia->ia_ifa);
1200			return (error);
1201		}
1202	}
1203
1204	/* Perform DAD, if the address is TENTATIVE. */
1205	if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1206		int delay, mindelay, maxdelay;
1207
1208		delay = 0;
1209		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1210			/*
1211			 * We need to impose a delay before sending an NS
1212			 * for DAD.  Check if we also needed a delay for the
1213			 * corresponding MLD message.  If we did, the delay
1214			 * should be larger than the MLD delay (this could be
1215			 * relaxed a bit, but this simple logic is at least
1216			 * safe).
1217			 * XXX: Break data hiding guidelines and look at
1218			 * state for the solicited multicast group.
1219			 */
1220			mindelay = 0;
1221			if (in6m_sol != NULL &&
1222			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1223				mindelay = in6m_sol->in6m_timer;
1224			}
1225			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1226			if (maxdelay - mindelay == 0)
1227				delay = 0;
1228			else {
1229				delay =
1230				    (arc4random() % (maxdelay - mindelay)) +
1231				    mindelay;
1232			}
1233		}
1234		nd6_dad_start((struct ifaddr *)ia, delay);
1235	}
1236
1237	in6_newaddrmsg(ia, RTM_ADD);
1238	ifa_free(&ia->ia_ifa);
1239	return (error);
1240}
1241
1242void
1243in6_purgeaddr(struct ifaddr *ifa)
1244{
1245	struct ifnet *ifp = ifa->ifa_ifp;
1246	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1247	struct in6_multi_mship *imm;
1248	int plen, error;
1249
1250	if (ifa->ifa_carp)
1251		(*carp_detach_p)(ifa, false);
1252
1253	/*
1254	 * Remove the loopback route to the interface address.
1255	 * The check for the current setting of "nd6_useloopback"
1256	 * is not needed.
1257	 */
1258	if (ia->ia_flags & IFA_RTSELF) {
1259		error = ifa_del_loopback_route((struct ifaddr *)ia,
1260		    (struct sockaddr *)&ia->ia_addr);
1261		if (error == 0)
1262			ia->ia_flags &= ~IFA_RTSELF;
1263	}
1264
1265	/* stop DAD processing */
1266	nd6_dad_stop(ifa);
1267
1268	/* Leave multicast groups. */
1269	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1270		LIST_REMOVE(imm, i6mm_chain);
1271		in6_leavegroup(imm);
1272	}
1273	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1274	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1275		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1276		    (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0));
1277		if (error != 0)
1278			log(LOG_INFO, "%s: err=%d, destination address delete "
1279			    "failed\n", __func__, error);
1280		ia->ia_flags &= ~IFA_ROUTE;
1281	}
1282
1283	in6_newaddrmsg(ia, RTM_DELETE);
1284	in6_unlink_ifa(ia, ifp);
1285}
1286
1287static void
1288in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1289{
1290	char ip6buf[INET6_ADDRSTRLEN];
1291	int remove_lle;
1292
1293	IF_ADDR_WLOCK(ifp);
1294	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1295	IF_ADDR_WUNLOCK(ifp);
1296	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1297
1298	/*
1299	 * Defer the release of what might be the last reference to the
1300	 * in6_ifaddr so that it can't be freed before the remainder of the
1301	 * cleanup.
1302	 */
1303	IN6_IFADDR_WLOCK();
1304	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1305	LIST_REMOVE(ia, ia6_hash);
1306	IN6_IFADDR_WUNLOCK();
1307
1308	/*
1309	 * Release the reference to the base prefix.  There should be a
1310	 * positive reference.
1311	 */
1312	remove_lle = 0;
1313	if (ia->ia6_ndpr == NULL) {
1314		nd6log((LOG_NOTICE,
1315		    "in6_unlink_ifa: autoconf'ed address "
1316		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1317	} else {
1318		ia->ia6_ndpr->ndpr_addrcnt--;
1319		/* Do not delete lles within prefix if refcont != 0 */
1320		if (ia->ia6_ndpr->ndpr_addrcnt == 0)
1321			remove_lle = 1;
1322		ia->ia6_ndpr = NULL;
1323	}
1324
1325	nd6_rem_ifa_lle(ia, remove_lle);
1326
1327	/*
1328	 * Also, if the address being removed is autoconf'ed, call
1329	 * pfxlist_onlink_check() since the release might affect the status of
1330	 * other (detached) addresses.
1331	 */
1332	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1333		pfxlist_onlink_check();
1334	}
1335	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1336}
1337
1338/*
1339 * Notifies other subsystems about address change/arrival:
1340 * 1) Notifies device handler on the first IPv6 address assignment
1341 * 2) Handle routing table changes for P2P links and route
1342 * 3) Handle routing table changes for address host route
1343 */
1344static int
1345in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1346    struct in6_aliasreq *ifra, int hostIsNew)
1347{
1348	int	error = 0, plen, ifacount = 0;
1349	struct ifaddr *ifa;
1350	struct sockaddr_in6 *pdst;
1351	char ip6buf[INET6_ADDRSTRLEN];
1352
1353	/*
1354	 * Give the interface a chance to initialize
1355	 * if this is its first address,
1356	 */
1357	if (hostIsNew != 0) {
1358		IF_ADDR_RLOCK(ifp);
1359		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1360			if (ifa->ifa_addr->sa_family != AF_INET6)
1361				continue;
1362			ifacount++;
1363		}
1364		IF_ADDR_RUNLOCK(ifp);
1365	}
1366
1367	if (ifacount <= 1 && ifp->if_ioctl) {
1368		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1369		if (error)
1370			return (error);
1371	}
1372
1373	/*
1374	 * If a new destination address is specified, scrub the old one and
1375	 * install the new destination.  Note that the interface must be
1376	 * p2p or loopback.
1377	 */
1378	pdst = &ifra->ifra_dstaddr;
1379	if (pdst->sin6_family == AF_INET6 &&
1380	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1381		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1382		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1383			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1384			    "remove a route to the old destination: %s\n",
1385			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1386			/* proceed anyway... */
1387		} else
1388			ia->ia_flags &= ~IFA_ROUTE;
1389		ia->ia_dstaddr = *pdst;
1390	}
1391
1392	/*
1393	 * If a new destination address is specified for a point-to-point
1394	 * interface, install a route to the destination as an interface
1395	 * direct route.
1396	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1397	 * interface that share the same destination.
1398	 */
1399	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1400	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1401	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1402		int rtflags = RTF_UP | RTF_HOST;
1403		/*
1404		 * Handle the case for ::1 .
1405		 */
1406		if (ifp->if_flags & IFF_LOOPBACK)
1407			ia->ia_flags |= IFA_RTSELF;
1408		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1409		if (error)
1410			return (error);
1411		ia->ia_flags |= IFA_ROUTE;
1412	}
1413
1414	/*
1415	 * add a loopback route to self if not exists
1416	 */
1417	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1418		error = ifa_add_loopback_route((struct ifaddr *)ia,
1419		    (struct sockaddr *)&ia->ia_addr);
1420		if (error == 0)
1421			ia->ia_flags |= IFA_RTSELF;
1422	}
1423
1424	return (error);
1425}
1426
1427/*
1428 * Find an IPv6 interface link-local address specific to an interface.
1429 * ifaddr is returned referenced.
1430 */
1431struct in6_ifaddr *
1432in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1433{
1434	struct ifaddr *ifa;
1435
1436	IF_ADDR_RLOCK(ifp);
1437	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1438		if (ifa->ifa_addr->sa_family != AF_INET6)
1439			continue;
1440		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1441			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1442			    ignoreflags) != 0)
1443				continue;
1444			ifa_ref(ifa);
1445			break;
1446		}
1447	}
1448	IF_ADDR_RUNLOCK(ifp);
1449
1450	return ((struct in6_ifaddr *)ifa);
1451}
1452
1453
1454/*
1455 * find the internet address corresponding to a given address.
1456 * ifaddr is returned referenced.
1457 */
1458struct in6_ifaddr *
1459in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1460{
1461	struct rm_priotracker in6_ifa_tracker;
1462	struct in6_ifaddr *ia;
1463
1464	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1465	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1466		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1467			if (zoneid != 0 &&
1468			    zoneid != ia->ia_addr.sin6_scope_id)
1469				continue;
1470			ifa_ref(&ia->ia_ifa);
1471			break;
1472		}
1473	}
1474	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1475	return (ia);
1476}
1477
1478/*
1479 * find the internet address corresponding to a given interface and address.
1480 * ifaddr is returned referenced.
1481 */
1482struct in6_ifaddr *
1483in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1484{
1485	struct ifaddr *ifa;
1486
1487	IF_ADDR_RLOCK(ifp);
1488	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1489		if (ifa->ifa_addr->sa_family != AF_INET6)
1490			continue;
1491		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1492			ifa_ref(ifa);
1493			break;
1494		}
1495	}
1496	IF_ADDR_RUNLOCK(ifp);
1497
1498	return ((struct in6_ifaddr *)ifa);
1499}
1500
1501/*
1502 * Find a link-local scoped address on ifp and return it if any.
1503 */
1504struct in6_ifaddr *
1505in6ifa_llaonifp(struct ifnet *ifp)
1506{
1507	struct sockaddr_in6 *sin6;
1508	struct ifaddr *ifa;
1509
1510	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1511		return (NULL);
1512	IF_ADDR_RLOCK(ifp);
1513	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1514		if (ifa->ifa_addr->sa_family != AF_INET6)
1515			continue;
1516		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1517		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1518		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1519		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1520			break;
1521	}
1522	IF_ADDR_RUNLOCK(ifp);
1523
1524	return ((struct in6_ifaddr *)ifa);
1525}
1526
1527/*
1528 * Convert IP6 address to printable (loggable) representation. Caller
1529 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1530 */
1531static char digits[] = "0123456789abcdef";
1532char *
1533ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1534{
1535	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1536	char *cp;
1537	const u_int16_t *a = (const u_int16_t *)addr;
1538	const u_int8_t *d;
1539	int dcolon = 0, zero = 0;
1540
1541	cp = ip6buf;
1542
1543	for (i = 0; i < 8; i++) {
1544		if (*(a + i) == 0) {
1545			cnt++;
1546			if (cnt == 1)
1547				idx = i;
1548		}
1549		else if (maxcnt < cnt) {
1550			maxcnt = cnt;
1551			index = idx;
1552			cnt = 0;
1553		}
1554	}
1555	if (maxcnt < cnt) {
1556		maxcnt = cnt;
1557		index = idx;
1558	}
1559
1560	for (i = 0; i < 8; i++) {
1561		if (dcolon == 1) {
1562			if (*a == 0) {
1563				if (i == 7)
1564					*cp++ = ':';
1565				a++;
1566				continue;
1567			} else
1568				dcolon = 2;
1569		}
1570		if (*a == 0) {
1571			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1572				if (i == 0)
1573					*cp++ = ':';
1574				*cp++ = ':';
1575				dcolon = 1;
1576			} else {
1577				*cp++ = '0';
1578				*cp++ = ':';
1579			}
1580			a++;
1581			continue;
1582		}
1583		d = (const u_char *)a;
1584		/* Try to eliminate leading zeros in printout like in :0001. */
1585		zero = 1;
1586		*cp = digits[*d >> 4];
1587		if (*cp != '0') {
1588			zero = 0;
1589			cp++;
1590		}
1591		*cp = digits[*d++ & 0xf];
1592		if (zero == 0 || (*cp != '0')) {
1593			zero = 0;
1594			cp++;
1595		}
1596		*cp = digits[*d >> 4];
1597		if (zero == 0 || (*cp != '0')) {
1598			zero = 0;
1599			cp++;
1600		}
1601		*cp++ = digits[*d & 0xf];
1602		*cp++ = ':';
1603		a++;
1604	}
1605	*--cp = '\0';
1606	return (ip6buf);
1607}
1608
1609int
1610in6_localaddr(struct in6_addr *in6)
1611{
1612	struct rm_priotracker in6_ifa_tracker;
1613	struct in6_ifaddr *ia;
1614
1615	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1616		return 1;
1617
1618	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1619	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1620		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1621		    &ia->ia_prefixmask.sin6_addr)) {
1622			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1623			return 1;
1624		}
1625	}
1626	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1627
1628	return (0);
1629}
1630
1631/*
1632 * Return 1 if an internet address is for the local host and configured
1633 * on one of its interfaces.
1634 */
1635int
1636in6_localip(struct in6_addr *in6)
1637{
1638	struct rm_priotracker in6_ifa_tracker;
1639	struct in6_ifaddr *ia;
1640
1641	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1642	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1643		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1644			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1645			return (1);
1646		}
1647	}
1648	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1649	return (0);
1650}
1651
1652/*
1653 * Return 1 if an internet address is configured on an interface.
1654 */
1655int
1656in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1657{
1658	struct in6_addr in6;
1659	struct ifaddr *ifa;
1660	struct in6_ifaddr *ia6;
1661
1662	in6 = *addr;
1663	if (in6_clearscope(&in6))
1664		return (0);
1665	in6_setscope(&in6, ifp, NULL);
1666
1667	IF_ADDR_RLOCK(ifp);
1668	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1669		if (ifa->ifa_addr->sa_family != AF_INET6)
1670			continue;
1671		ia6 = (struct in6_ifaddr *)ifa;
1672		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1673			IF_ADDR_RUNLOCK(ifp);
1674			return (1);
1675		}
1676	}
1677	IF_ADDR_RUNLOCK(ifp);
1678
1679	return (0);
1680}
1681
1682int
1683in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1684{
1685	struct rm_priotracker in6_ifa_tracker;
1686	struct in6_ifaddr *ia;
1687
1688	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1689	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1690		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1691			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1692				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1693				return (1); /* true */
1694			}
1695			break;
1696		}
1697	}
1698	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1699
1700	return (0);		/* false */
1701}
1702
1703/*
1704 * return length of part which dst and src are equal
1705 * hard coding...
1706 */
1707int
1708in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1709{
1710	int match = 0;
1711	u_char *s = (u_char *)src, *d = (u_char *)dst;
1712	u_char *lim = s + 16, r;
1713
1714	while (s < lim)
1715		if ((r = (*d++ ^ *s++)) != 0) {
1716			while (r < 128) {
1717				match++;
1718				r <<= 1;
1719			}
1720			break;
1721		} else
1722			match += 8;
1723	return match;
1724}
1725
1726/* XXX: to be scope conscious */
1727int
1728in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1729{
1730	int bytelen, bitlen;
1731
1732	/* sanity check */
1733	if (0 > len || len > 128) {
1734		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1735		    len);
1736		return (0);
1737	}
1738
1739	bytelen = len / 8;
1740	bitlen = len % 8;
1741
1742	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1743		return (0);
1744	if (bitlen != 0 &&
1745	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1746	    p2->s6_addr[bytelen] >> (8 - bitlen))
1747		return (0);
1748
1749	return (1);
1750}
1751
1752void
1753in6_prefixlen2mask(struct in6_addr *maskp, int len)
1754{
1755	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1756	int bytelen, bitlen, i;
1757
1758	/* sanity check */
1759	if (0 > len || len > 128) {
1760		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1761		    len);
1762		return;
1763	}
1764
1765	bzero(maskp, sizeof(*maskp));
1766	bytelen = len / 8;
1767	bitlen = len % 8;
1768	for (i = 0; i < bytelen; i++)
1769		maskp->s6_addr[i] = 0xff;
1770	if (bitlen)
1771		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1772}
1773
1774/*
1775 * return the best address out of the same scope. if no address was
1776 * found, return the first valid address from designated IF.
1777 */
1778struct in6_ifaddr *
1779in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1780{
1781	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1782	struct ifaddr *ifa;
1783	struct in6_ifaddr *besta = NULL;
1784	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1785
1786	dep[0] = dep[1] = NULL;
1787
1788	/*
1789	 * We first look for addresses in the same scope.
1790	 * If there is one, return it.
1791	 * If two or more, return one which matches the dst longest.
1792	 * If none, return one of global addresses assigned other ifs.
1793	 */
1794	IF_ADDR_RLOCK(ifp);
1795	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1796		if (ifa->ifa_addr->sa_family != AF_INET6)
1797			continue;
1798		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1799			continue; /* XXX: is there any case to allow anycast? */
1800		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1801			continue; /* don't use this interface */
1802		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1803			continue;
1804		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1805			if (V_ip6_use_deprecated)
1806				dep[0] = (struct in6_ifaddr *)ifa;
1807			continue;
1808		}
1809
1810		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1811			/*
1812			 * call in6_matchlen() as few as possible
1813			 */
1814			if (besta) {
1815				if (blen == -1)
1816					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1817				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1818				if (tlen > blen) {
1819					blen = tlen;
1820					besta = (struct in6_ifaddr *)ifa;
1821				}
1822			} else
1823				besta = (struct in6_ifaddr *)ifa;
1824		}
1825	}
1826	if (besta) {
1827		ifa_ref(&besta->ia_ifa);
1828		IF_ADDR_RUNLOCK(ifp);
1829		return (besta);
1830	}
1831
1832	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1833		if (ifa->ifa_addr->sa_family != AF_INET6)
1834			continue;
1835		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1836			continue; /* XXX: is there any case to allow anycast? */
1837		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1838			continue; /* don't use this interface */
1839		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1840			continue;
1841		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1842			if (V_ip6_use_deprecated)
1843				dep[1] = (struct in6_ifaddr *)ifa;
1844			continue;
1845		}
1846
1847		if (ifa != NULL)
1848			ifa_ref(ifa);
1849		IF_ADDR_RUNLOCK(ifp);
1850		return (struct in6_ifaddr *)ifa;
1851	}
1852
1853	/* use the last-resort values, that are, deprecated addresses */
1854	if (dep[0]) {
1855		ifa_ref((struct ifaddr *)dep[0]);
1856		IF_ADDR_RUNLOCK(ifp);
1857		return dep[0];
1858	}
1859	if (dep[1]) {
1860		ifa_ref((struct ifaddr *)dep[1]);
1861		IF_ADDR_RUNLOCK(ifp);
1862		return dep[1];
1863	}
1864
1865	IF_ADDR_RUNLOCK(ifp);
1866	return NULL;
1867}
1868
1869/*
1870 * perform DAD when interface becomes IFF_UP.
1871 */
1872void
1873in6_if_up(struct ifnet *ifp)
1874{
1875	struct ifaddr *ifa;
1876	struct in6_ifaddr *ia;
1877
1878	IF_ADDR_RLOCK(ifp);
1879	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1880		if (ifa->ifa_addr->sa_family != AF_INET6)
1881			continue;
1882		ia = (struct in6_ifaddr *)ifa;
1883		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1884			/*
1885			 * The TENTATIVE flag was likely set by hand
1886			 * beforehand, implicitly indicating the need for DAD.
1887			 * We may be able to skip the random delay in this
1888			 * case, but we impose delays just in case.
1889			 */
1890			nd6_dad_start(ifa,
1891			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1892		}
1893	}
1894	IF_ADDR_RUNLOCK(ifp);
1895
1896	/*
1897	 * special cases, like 6to4, are handled in in6_ifattach
1898	 */
1899	in6_ifattach(ifp, NULL);
1900}
1901
1902int
1903in6if_do_dad(struct ifnet *ifp)
1904{
1905	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1906		return (0);
1907
1908	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1909	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1910		return (0);
1911
1912	/*
1913	 * Our DAD routine requires the interface up and running.
1914	 * However, some interfaces can be up before the RUNNING
1915	 * status.  Additionally, users may try to assign addresses
1916	 * before the interface becomes up (or running).
1917	 * This function returns EAGAIN in that case.
1918	 * The caller should mark "tentative" on the address instead of
1919	 * performing DAD immediately.
1920	 */
1921	if (!((ifp->if_flags & IFF_UP) &&
1922	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1923		return (EAGAIN);
1924
1925	return (1);
1926}
1927
1928/*
1929 * Calculate max IPv6 MTU through all the interfaces and store it
1930 * to in6_maxmtu.
1931 */
1932void
1933in6_setmaxmtu(void)
1934{
1935	unsigned long maxmtu = 0;
1936	struct ifnet *ifp;
1937
1938	IFNET_RLOCK_NOSLEEP();
1939	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1940		/* this function can be called during ifnet initialization */
1941		if (!ifp->if_afdata[AF_INET6])
1942			continue;
1943		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1944		    IN6_LINKMTU(ifp) > maxmtu)
1945			maxmtu = IN6_LINKMTU(ifp);
1946	}
1947	IFNET_RUNLOCK_NOSLEEP();
1948	if (maxmtu)	/* update only when maxmtu is positive */
1949		V_in6_maxmtu = maxmtu;
1950}
1951
1952/*
1953 * Provide the length of interface identifiers to be used for the link attached
1954 * to the given interface.  The length should be defined in "IPv6 over
1955 * xxx-link" document.  Note that address architecture might also define
1956 * the length for a particular set of address prefixes, regardless of the
1957 * link type.  As clarified in rfc2462bis, those two definitions should be
1958 * consistent, and those really are as of August 2004.
1959 */
1960int
1961in6_if2idlen(struct ifnet *ifp)
1962{
1963	switch (ifp->if_type) {
1964	case IFT_ETHER:		/* RFC2464 */
1965	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
1966	case IFT_L2VLAN:	/* ditto */
1967	case IFT_BRIDGE:	/* bridge(4) only does Ethernet-like links */
1968	case IFT_INFINIBAND:
1969		return (64);
1970	case IFT_FDDI:		/* RFC2467 */
1971		return (64);
1972	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
1973		return (64);
1974	case IFT_PPP:		/* RFC2472 */
1975		return (64);
1976	case IFT_ARCNET:	/* RFC2497 */
1977		return (64);
1978	case IFT_FRELAY:	/* RFC2590 */
1979		return (64);
1980	case IFT_IEEE1394:	/* RFC3146 */
1981		return (64);
1982	case IFT_GIF:
1983		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
1984	case IFT_LOOP:
1985		return (64);	/* XXX: is this really correct? */
1986	default:
1987		/*
1988		 * Unknown link type:
1989		 * It might be controversial to use the today's common constant
1990		 * of 64 for these cases unconditionally.  For full compliance,
1991		 * we should return an error in this case.  On the other hand,
1992		 * if we simply miss the standard for the link type or a new
1993		 * standard is defined for a new link type, the IFID length
1994		 * is very likely to be the common constant.  As a compromise,
1995		 * we always use the constant, but make an explicit notice
1996		 * indicating the "unknown" case.
1997		 */
1998		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
1999		return (64);
2000	}
2001}
2002
2003#include <sys/sysctl.h>
2004
2005struct in6_llentry {
2006	struct llentry		base;
2007};
2008
2009#define	IN6_LLTBL_DEFAULT_HSIZE	32
2010#define	IN6_LLTBL_HASH(k, h) \
2011	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2012
2013/*
2014 * Do actual deallocation of @lle.
2015 */
2016static void
2017in6_lltable_destroy_lle_unlocked(struct llentry *lle)
2018{
2019
2020	LLE_LOCK_DESTROY(lle);
2021	LLE_REQ_DESTROY(lle);
2022	free(lle, M_LLTABLE);
2023}
2024
2025/*
2026 * Called by LLE_FREE_LOCKED when number of references
2027 * drops to zero.
2028 */
2029static void
2030in6_lltable_destroy_lle(struct llentry *lle)
2031{
2032
2033	LLE_WUNLOCK(lle);
2034	in6_lltable_destroy_lle_unlocked(lle);
2035}
2036
2037static struct llentry *
2038in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2039{
2040	struct in6_llentry *lle;
2041
2042	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2043	if (lle == NULL)		/* NB: caller generates msg */
2044		return NULL;
2045
2046	lle->base.r_l3addr.addr6 = *addr6;
2047	lle->base.lle_refcnt = 1;
2048	lle->base.lle_free = in6_lltable_destroy_lle;
2049	LLE_LOCK_INIT(&lle->base);
2050	LLE_REQ_INIT(&lle->base);
2051	callout_init(&lle->base.lle_timer, 1);
2052
2053	return (&lle->base);
2054}
2055
2056static int
2057in6_lltable_match_prefix(const struct sockaddr *saddr,
2058    const struct sockaddr *smask, u_int flags, struct llentry *lle)
2059{
2060	const struct in6_addr *addr, *mask, *lle_addr;
2061
2062	addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2063	mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2064	lle_addr = &lle->r_l3addr.addr6;
2065
2066	if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2067		return (0);
2068
2069	if (lle->la_flags & LLE_IFADDR) {
2070
2071		/*
2072		 * Delete LLE_IFADDR records IFF address & flag matches.
2073		 * Note that addr is the interface address within prefix
2074		 * being matched.
2075		 */
2076		if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2077		    (flags & LLE_STATIC) != 0)
2078			return (1);
2079		return (0);
2080	}
2081
2082	/* flags & LLE_STATIC means deleting both dynamic and static entries */
2083	if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2084		return (1);
2085
2086	return (0);
2087}
2088
2089static void
2090in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2091{
2092	struct ifnet *ifp;
2093
2094	LLE_WLOCK_ASSERT(lle);
2095	KASSERT(llt != NULL, ("lltable is NULL"));
2096
2097	/* Unlink entry from table */
2098	if ((lle->la_flags & LLE_LINKED) != 0) {
2099
2100		ifp = llt->llt_ifp;
2101		IF_AFDATA_WLOCK_ASSERT(ifp);
2102		lltable_unlink_entry(llt, lle);
2103	}
2104
2105	if (callout_stop(&lle->lle_timer) > 0)
2106		LLE_REMREF(lle);
2107
2108	llentry_free(lle);
2109}
2110
2111static int
2112in6_lltable_rtcheck(struct ifnet *ifp,
2113		    u_int flags,
2114		    const struct sockaddr *l3addr)
2115{
2116	const struct sockaddr_in6 *sin6;
2117	struct nhop6_basic nh6;
2118	struct in6_addr dst;
2119	uint32_t scopeid;
2120	int error;
2121	char ip6buf[INET6_ADDRSTRLEN];
2122	int fibnum;
2123
2124	KASSERT(l3addr->sa_family == AF_INET6,
2125	    ("sin_family %d", l3addr->sa_family));
2126
2127	sin6 = (const struct sockaddr_in6 *)l3addr;
2128	in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2129	fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib;
2130	error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6);
2131	if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
2132		struct ifaddr *ifa;
2133		/*
2134		 * Create an ND6 cache for an IPv6 neighbor
2135		 * that is not covered by our own prefix.
2136		 */
2137		ifa = ifaof_ifpforaddr(l3addr, ifp);
2138		if (ifa != NULL) {
2139			ifa_free(ifa);
2140			return 0;
2141		}
2142		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2143		    ip6_sprintf(ip6buf, &sin6->sin6_addr));
2144		return EINVAL;
2145	}
2146	return 0;
2147}
2148
2149static inline uint32_t
2150in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2151{
2152
2153	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2154}
2155
2156static uint32_t
2157in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2158{
2159
2160	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2161}
2162
2163static void
2164in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2165{
2166	struct sockaddr_in6 *sin6;
2167
2168	sin6 = (struct sockaddr_in6 *)sa;
2169	bzero(sin6, sizeof(*sin6));
2170	sin6->sin6_family = AF_INET6;
2171	sin6->sin6_len = sizeof(*sin6);
2172	sin6->sin6_addr = lle->r_l3addr.addr6;
2173}
2174
2175static inline struct llentry *
2176in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2177{
2178	struct llentry *lle;
2179	struct llentries *lleh;
2180	u_int hashidx;
2181
2182	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2183	lleh = &llt->lle_head[hashidx];
2184	LIST_FOREACH(lle, lleh, lle_next) {
2185		if (lle->la_flags & LLE_DELETED)
2186			continue;
2187		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2188			break;
2189	}
2190
2191	return (lle);
2192}
2193
2194static void
2195in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2196{
2197
2198	lle->la_flags |= LLE_DELETED;
2199	EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2200#ifdef DIAGNOSTIC
2201	log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2202#endif
2203	llentry_free(lle);
2204}
2205
2206static struct llentry *
2207in6_lltable_alloc(struct lltable *llt, u_int flags,
2208	const struct sockaddr *l3addr)
2209{
2210	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2211	struct ifnet *ifp = llt->llt_ifp;
2212	struct llentry *lle;
2213	char linkhdr[LLE_MAX_LINKHDR];
2214	size_t linkhdrsize;
2215	int lladdr_off;
2216
2217	KASSERT(l3addr->sa_family == AF_INET6,
2218	    ("sin_family %d", l3addr->sa_family));
2219
2220	/*
2221	 * A route that covers the given address must have
2222	 * been installed 1st because we are doing a resolution,
2223	 * verify this.
2224	 */
2225	if (!(flags & LLE_IFADDR) &&
2226	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2227		return (NULL);
2228
2229	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2230	if (lle == NULL) {
2231		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2232		return (NULL);
2233	}
2234	lle->la_flags = flags;
2235	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2236		linkhdrsize = LLE_MAX_LINKHDR;
2237		if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
2238		    linkhdr, &linkhdrsize, &lladdr_off) != 0) {
2239			in6_lltable_destroy_lle_unlocked(lle);
2240			return (NULL);
2241		}
2242		lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
2243		    lladdr_off);
2244		lle->la_flags |= LLE_STATIC;
2245	}
2246
2247	if ((lle->la_flags & LLE_STATIC) != 0)
2248		lle->ln_state = ND6_LLINFO_REACHABLE;
2249
2250	return (lle);
2251}
2252
2253static struct llentry *
2254in6_lltable_lookup(struct lltable *llt, u_int flags,
2255	const struct sockaddr *l3addr)
2256{
2257	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2258	struct llentry *lle;
2259
2260	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2261	KASSERT(l3addr->sa_family == AF_INET6,
2262	    ("sin_family %d", l3addr->sa_family));
2263
2264	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2265
2266	if (lle == NULL)
2267		return (NULL);
2268
2269	KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
2270	    (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
2271	    flags));
2272
2273	if (flags & LLE_UNLOCKED)
2274		return (lle);
2275
2276	if (flags & LLE_EXCLUSIVE)
2277		LLE_WLOCK(lle);
2278	else
2279		LLE_RLOCK(lle);
2280	return (lle);
2281}
2282
2283static int
2284in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2285    struct sysctl_req *wr)
2286{
2287	struct ifnet *ifp = llt->llt_ifp;
2288	/* XXX stack use */
2289	struct {
2290		struct rt_msghdr	rtm;
2291		struct sockaddr_in6	sin6;
2292		/*
2293		 * ndp.c assumes that sdl is word aligned
2294		 */
2295#ifdef __LP64__
2296		uint32_t		pad;
2297#endif
2298		struct sockaddr_dl	sdl;
2299	} ndpc;
2300	struct sockaddr_dl *sdl;
2301	int error;
2302
2303	bzero(&ndpc, sizeof(ndpc));
2304			/* skip deleted entries */
2305			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2306				return (0);
2307			/* Skip if jailed and not a valid IP of the prison. */
2308			lltable_fill_sa_entry(lle,
2309			    (struct sockaddr *)&ndpc.sin6);
2310			if (prison_if(wr->td->td_ucred,
2311			    (struct sockaddr *)&ndpc.sin6) != 0)
2312				return (0);
2313			/*
2314			 * produce a msg made of:
2315			 *  struct rt_msghdr;
2316			 *  struct sockaddr_in6 (IPv6)
2317			 *  struct sockaddr_dl;
2318			 */
2319			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2320			ndpc.rtm.rtm_version = RTM_VERSION;
2321			ndpc.rtm.rtm_type = RTM_GET;
2322			ndpc.rtm.rtm_flags = RTF_UP;
2323			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2324			if (V_deembed_scopeid)
2325				sa6_recoverscope(&ndpc.sin6);
2326
2327			/* publish */
2328			if (lle->la_flags & LLE_PUB)
2329				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2330
2331			sdl = &ndpc.sdl;
2332			sdl->sdl_family = AF_LINK;
2333			sdl->sdl_len = sizeof(*sdl);
2334			sdl->sdl_index = ifp->if_index;
2335			sdl->sdl_type = ifp->if_type;
2336			if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
2337				sdl->sdl_alen = ifp->if_addrlen;
2338				bcopy(lle->ll_addr, LLADDR(sdl),
2339				    ifp->if_addrlen);
2340			} else {
2341				sdl->sdl_alen = 0;
2342				bzero(LLADDR(sdl), ifp->if_addrlen);
2343			}
2344			if (lle->la_expire != 0)
2345				ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2346				    lle->lle_remtime / hz +
2347				    time_second - time_uptime;
2348			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2349			if (lle->la_flags & LLE_STATIC)
2350				ndpc.rtm.rtm_flags |= RTF_STATIC;
2351			if (lle->la_flags & LLE_IFADDR)
2352				ndpc.rtm.rtm_flags |= RTF_PINNED;
2353			if (lle->ln_router != 0)
2354				ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2355			ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2356			/* Store state in rmx_weight value */
2357			ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2358			ndpc.rtm.rtm_index = ifp->if_index;
2359			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2360
2361	return (error);
2362}
2363
2364static struct lltable *
2365in6_lltattach(struct ifnet *ifp)
2366{
2367	struct lltable *llt;
2368
2369	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2370	llt->llt_af = AF_INET6;
2371	llt->llt_ifp = ifp;
2372
2373	llt->llt_lookup = in6_lltable_lookup;
2374	llt->llt_alloc_entry = in6_lltable_alloc;
2375	llt->llt_delete_entry = in6_lltable_delete_entry;
2376	llt->llt_dump_entry = in6_lltable_dump_entry;
2377	llt->llt_hash = in6_lltable_hash;
2378	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2379	llt->llt_free_entry = in6_lltable_free_entry;
2380	llt->llt_match_prefix = in6_lltable_match_prefix;
2381 	lltable_link(llt);
2382
2383	return (llt);
2384}
2385
2386void *
2387in6_domifattach(struct ifnet *ifp)
2388{
2389	struct in6_ifextra *ext;
2390
2391	/* There are not IPv6-capable interfaces. */
2392	switch (ifp->if_type) {
2393	case IFT_PFLOG:
2394	case IFT_PFSYNC:
2395	case IFT_USB:
2396		return (NULL);
2397	}
2398	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2399	bzero(ext, sizeof(*ext));
2400
2401	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2402	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2403	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2404	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2405
2406	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2407	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2408	    M_WAITOK);
2409	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2410	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2411
2412	ext->nd_ifinfo = nd6_ifattach(ifp);
2413	ext->scope6_id = scope6_ifattach(ifp);
2414	ext->lltable = in6_lltattach(ifp);
2415
2416	ext->mld_ifinfo = mld_domifattach(ifp);
2417
2418	return ext;
2419}
2420
2421int
2422in6_domifmtu(struct ifnet *ifp)
2423{
2424	if (ifp->if_afdata[AF_INET6] == NULL)
2425		return ifp->if_mtu;
2426
2427	return (IN6_LINKMTU(ifp));
2428}
2429
2430void
2431in6_domifdetach(struct ifnet *ifp, void *aux)
2432{
2433	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2434
2435	mld_domifdetach(ifp);
2436	scope6_ifdetach(ext->scope6_id);
2437	nd6_ifdetach(ifp, ext->nd_ifinfo);
2438	lltable_free(ext->lltable);
2439	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2440	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2441	free(ext->in6_ifstat, M_IFADDR);
2442	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2443	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2444	free(ext->icmp6_ifstat, M_IFADDR);
2445	free(ext, M_IFADDR);
2446}
2447
2448/*
2449 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2450 * v4 mapped addr or v4 compat addr
2451 */
2452void
2453in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2454{
2455
2456	bzero(sin, sizeof(*sin));
2457	sin->sin_len = sizeof(struct sockaddr_in);
2458	sin->sin_family = AF_INET;
2459	sin->sin_port = sin6->sin6_port;
2460	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2461}
2462
2463/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2464void
2465in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2466{
2467	bzero(sin6, sizeof(*sin6));
2468	sin6->sin6_len = sizeof(struct sockaddr_in6);
2469	sin6->sin6_family = AF_INET6;
2470	sin6->sin6_port = sin->sin_port;
2471	sin6->sin6_addr.s6_addr32[0] = 0;
2472	sin6->sin6_addr.s6_addr32[1] = 0;
2473	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2474	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2475}
2476
2477/* Convert sockaddr_in6 into sockaddr_in. */
2478void
2479in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2480{
2481	struct sockaddr_in *sin_p;
2482	struct sockaddr_in6 sin6;
2483
2484	/*
2485	 * Save original sockaddr_in6 addr and convert it
2486	 * to sockaddr_in.
2487	 */
2488	sin6 = *(struct sockaddr_in6 *)nam;
2489	sin_p = (struct sockaddr_in *)nam;
2490	in6_sin6_2_sin(sin_p, &sin6);
2491}
2492
2493/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2494void
2495in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2496{
2497	struct sockaddr_in *sin_p;
2498	struct sockaddr_in6 *sin6_p;
2499
2500	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2501	sin_p = (struct sockaddr_in *)*nam;
2502	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2503	free(*nam, M_SONAME);
2504	*nam = (struct sockaddr *)sin6_p;
2505}
2506