in6.c revision 1ca5d173abc8391e7e3f7e9fc63ec652fed67879
1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 *	The Regents of the University of California.  All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 *	@(#)in.c	8.2 (Berkeley) 11/15/93
61 */
62
63#include <sys/cdefs.h>
64__FBSDID("$FreeBSD$");
65
66#include "opt_compat.h"
67#include "opt_inet.h"
68#include "opt_inet6.h"
69
70#include <sys/param.h>
71#include <sys/eventhandler.h>
72#include <sys/errno.h>
73#include <sys/jail.h>
74#include <sys/malloc.h>
75#include <sys/socket.h>
76#include <sys/socketvar.h>
77#include <sys/sockio.h>
78#include <sys/systm.h>
79#include <sys/priv.h>
80#include <sys/proc.h>
81#include <sys/time.h>
82#include <sys/kernel.h>
83#include <sys/syslog.h>
84
85#include <net/if.h>
86#include <net/if_var.h>
87#include <net/if_types.h>
88#include <net/route.h>
89#include <net/if_dl.h>
90#include <net/vnet.h>
91
92#include <netinet/in.h>
93#include <netinet/in_var.h>
94#include <net/if_llatbl.h>
95#include <netinet/if_ether.h>
96#include <netinet/in_systm.h>
97#include <netinet/ip.h>
98#include <netinet/in_pcb.h>
99#include <netinet/ip_carp.h>
100
101#include <netinet/ip6.h>
102#include <netinet6/ip6_var.h>
103#include <netinet6/nd6.h>
104#include <netinet6/mld6_var.h>
105#include <netinet6/ip6_mroute.h>
106#include <netinet6/in6_ifattach.h>
107#include <netinet6/scope6_var.h>
108#include <netinet6/in6_pcb.h>
109
110VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
111#define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
112
113/*
114 * Definitions of some costant IP6 addresses.
115 */
116const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
117const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
118const struct in6_addr in6addr_nodelocal_allnodes =
119	IN6ADDR_NODELOCAL_ALLNODES_INIT;
120const struct in6_addr in6addr_linklocal_allnodes =
121	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
122const struct in6_addr in6addr_linklocal_allrouters =
123	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
124const struct in6_addr in6addr_linklocal_allv2routers =
125	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
126
127const struct in6_addr in6mask0 = IN6MASK0;
128const struct in6_addr in6mask32 = IN6MASK32;
129const struct in6_addr in6mask64 = IN6MASK64;
130const struct in6_addr in6mask96 = IN6MASK96;
131const struct in6_addr in6mask128 = IN6MASK128;
132
133const struct sockaddr_in6 sa6_any =
134	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
135
136static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
137	struct in6_aliasreq *, int);
138static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
139
140static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
141    struct in6_ifaddr *, int);
142static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
143    struct in6_aliasreq *, int flags);
144static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
145    struct in6_ifaddr *, int, int);
146static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
147    struct in6_ifaddr *, int);
148
149#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
150#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
151
152
153void
154in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
155{
156	struct sockaddr_dl gateway;
157	struct sockaddr_in6 mask, addr;
158	struct rtentry rt;
159
160	/*
161	 * initialize for rtmsg generation
162	 */
163	bzero(&gateway, sizeof(gateway));
164	gateway.sdl_len = sizeof(gateway);
165	gateway.sdl_family = AF_LINK;
166
167	bzero(&rt, sizeof(rt));
168	rt.rt_gateway = (struct sockaddr *)&gateway;
169	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
170	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
171	rt_mask(&rt) = (struct sockaddr *)&mask;
172	rt_key(&rt) = (struct sockaddr *)&addr;
173	rt.rt_flags = RTF_HOST | RTF_STATIC;
174	if (cmd == RTM_ADD)
175		rt.rt_flags |= RTF_UP;
176	/* Announce arrival of local address to all FIBs. */
177	rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
178}
179
180int
181in6_mask2len(struct in6_addr *mask, u_char *lim0)
182{
183	int x = 0, y;
184	u_char *lim = lim0, *p;
185
186	/* ignore the scope_id part */
187	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
188		lim = (u_char *)mask + sizeof(*mask);
189	for (p = (u_char *)mask; p < lim; x++, p++) {
190		if (*p != 0xff)
191			break;
192	}
193	y = 0;
194	if (p < lim) {
195		for (y = 0; y < 8; y++) {
196			if ((*p & (0x80 >> y)) == 0)
197				break;
198		}
199	}
200
201	/*
202	 * when the limit pointer is given, do a stricter check on the
203	 * remaining bits.
204	 */
205	if (p < lim) {
206		if (y != 0 && (*p & (0x00ff >> y)) != 0)
207			return (-1);
208		for (p = p + 1; p < lim; p++)
209			if (*p != 0)
210				return (-1);
211	}
212
213	return x * 8 + y;
214}
215
216#ifdef COMPAT_FREEBSD32
217struct in6_ndifreq32 {
218	char ifname[IFNAMSIZ];
219	uint32_t ifindex;
220};
221#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
222#endif
223
224int
225in6_control(struct socket *so, u_long cmd, caddr_t data,
226    struct ifnet *ifp, struct thread *td)
227{
228	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
229	struct	in6_ifaddr *ia = NULL;
230	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
231	struct sockaddr_in6 *sa6;
232	int carp_attached = 0;
233	int error;
234	u_long ocmd = cmd;
235
236	/*
237	 * Compat to make pre-10.x ifconfig(8) operable.
238	 */
239	if (cmd == OSIOCAIFADDR_IN6)
240		cmd = SIOCAIFADDR_IN6;
241
242	switch (cmd) {
243	case SIOCGETSGCNT_IN6:
244	case SIOCGETMIFCNT_IN6:
245		/*
246		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
247		 * We cannot see how that would be needed, so do not adjust the
248		 * KPI blindly; more likely should clean up the IPv4 variant.
249		 */
250		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
251	}
252
253	switch (cmd) {
254	case SIOCAADDRCTL_POLICY:
255	case SIOCDADDRCTL_POLICY:
256		if (td != NULL) {
257			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
258			if (error)
259				return (error);
260		}
261		return (in6_src_ioctl(cmd, data));
262	}
263
264	if (ifp == NULL)
265		return (EOPNOTSUPP);
266
267	switch (cmd) {
268	case SIOCSNDFLUSH_IN6:
269	case SIOCSPFXFLUSH_IN6:
270	case SIOCSRTRFLUSH_IN6:
271	case SIOCSDEFIFACE_IN6:
272	case SIOCSIFINFO_FLAGS:
273	case SIOCSIFINFO_IN6:
274		if (td != NULL) {
275			error = priv_check(td, PRIV_NETINET_ND6);
276			if (error)
277				return (error);
278		}
279		/* FALLTHROUGH */
280	case OSIOCGIFINFO_IN6:
281	case SIOCGIFINFO_IN6:
282	case SIOCGDRLST_IN6:
283	case SIOCGPRLST_IN6:
284	case SIOCGNBRINFO_IN6:
285	case SIOCGDEFIFACE_IN6:
286		return (nd6_ioctl(cmd, data, ifp));
287
288#ifdef COMPAT_FREEBSD32
289	case SIOCGDEFIFACE32_IN6:
290		{
291			struct in6_ndifreq ndif;
292			struct in6_ndifreq32 *ndif32;
293
294			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
295			    ifp);
296			if (error)
297				return (error);
298			ndif32 = (struct in6_ndifreq32 *)data;
299			ndif32->ifindex = ndif.ifindex;
300			return (0);
301		}
302#endif
303	}
304
305	switch (cmd) {
306	case SIOCSIFPREFIX_IN6:
307	case SIOCDIFPREFIX_IN6:
308	case SIOCAIFPREFIX_IN6:
309	case SIOCCIFPREFIX_IN6:
310	case SIOCSGIFPREFIX_IN6:
311	case SIOCGIFPREFIX_IN6:
312		log(LOG_NOTICE,
313		    "prefix ioctls are now invalidated. "
314		    "please use ifconfig.\n");
315		return (EOPNOTSUPP);
316	}
317
318	switch (cmd) {
319	case SIOCSSCOPE6:
320		if (td != NULL) {
321			error = priv_check(td, PRIV_NETINET_SCOPE6);
322			if (error)
323				return (error);
324		}
325		/* FALLTHROUGH */
326	case SIOCGSCOPE6:
327	case SIOCGSCOPE6DEF:
328		return (scope6_ioctl(cmd, data, ifp));
329	}
330
331	/*
332	 * Find address for this interface, if it exists.
333	 *
334	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
335	 * only, and used the first interface address as the target of other
336	 * operations (without checking ifra_addr).  This was because netinet
337	 * code/API assumed at most 1 interface address per interface.
338	 * Since IPv6 allows a node to assign multiple addresses
339	 * on a single interface, we almost always look and check the
340	 * presence of ifra_addr, and reject invalid ones here.
341	 * It also decreases duplicated code among SIOC*_IN6 operations.
342	 */
343	switch (cmd) {
344	case SIOCAIFADDR_IN6:
345	case SIOCSIFPHYADDR_IN6:
346		sa6 = &ifra->ifra_addr;
347		break;
348	case SIOCSIFADDR_IN6:
349	case SIOCGIFADDR_IN6:
350	case SIOCSIFDSTADDR_IN6:
351	case SIOCSIFNETMASK_IN6:
352	case SIOCGIFDSTADDR_IN6:
353	case SIOCGIFNETMASK_IN6:
354	case SIOCDIFADDR_IN6:
355	case SIOCGIFPSRCADDR_IN6:
356	case SIOCGIFPDSTADDR_IN6:
357	case SIOCGIFAFLAG_IN6:
358	case SIOCSNDFLUSH_IN6:
359	case SIOCSPFXFLUSH_IN6:
360	case SIOCSRTRFLUSH_IN6:
361	case SIOCGIFALIFETIME_IN6:
362	case SIOCSIFALIFETIME_IN6:
363	case SIOCGIFSTAT_IN6:
364	case SIOCGIFSTAT_ICMP6:
365		sa6 = &ifr->ifr_addr;
366		break;
367	case SIOCSIFADDR:
368	case SIOCSIFBRDADDR:
369	case SIOCSIFDSTADDR:
370	case SIOCSIFNETMASK:
371		/*
372		 * Although we should pass any non-INET6 ioctl requests
373		 * down to driver, we filter some legacy INET requests.
374		 * Drivers trust SIOCSIFADDR et al to come from an already
375		 * privileged layer, and do not perform any credentials
376		 * checks or input validation.
377		 */
378		return (EINVAL);
379	default:
380		sa6 = NULL;
381		break;
382	}
383	if (sa6 && sa6->sin6_family == AF_INET6) {
384		if (sa6->sin6_scope_id != 0)
385			error = sa6_embedscope(sa6, 0);
386		else
387			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
388		if (error != 0)
389			return (error);
390		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
391		    &sa6->sin6_addr)) != 0)
392			return (error);
393		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
394	} else
395		ia = NULL;
396
397	switch (cmd) {
398	case SIOCSIFADDR_IN6:
399	case SIOCSIFDSTADDR_IN6:
400	case SIOCSIFNETMASK_IN6:
401		/*
402		 * Since IPv6 allows a node to assign multiple addresses
403		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
404		 */
405		/* we decided to obsolete this command (20000704) */
406		error = EINVAL;
407		goto out;
408
409	case SIOCDIFADDR_IN6:
410		/*
411		 * for IPv4, we look for existing in_ifaddr here to allow
412		 * "ifconfig if0 delete" to remove the first IPv4 address on
413		 * the interface.  For IPv6, as the spec allows multiple
414		 * interface address from the day one, we consider "remove the
415		 * first one" semantics to be not preferable.
416		 */
417		if (ia == NULL) {
418			error = EADDRNOTAVAIL;
419			goto out;
420		}
421		/* FALLTHROUGH */
422	case SIOCAIFADDR_IN6:
423		/*
424		 * We always require users to specify a valid IPv6 address for
425		 * the corresponding operation.
426		 */
427		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
428		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
429			error = EAFNOSUPPORT;
430			goto out;
431		}
432
433		if (td != NULL) {
434			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
435			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
436			if (error)
437				goto out;
438		}
439		/* FALLTHROUGH */
440	case SIOCGIFSTAT_IN6:
441	case SIOCGIFSTAT_ICMP6:
442		if (ifp->if_afdata[AF_INET6] == NULL) {
443			error = EPFNOSUPPORT;
444			goto out;
445		}
446		break;
447
448	case SIOCGIFADDR_IN6:
449		/* This interface is basically deprecated. use SIOCGIFCONF. */
450		/* FALLTHROUGH */
451	case SIOCGIFAFLAG_IN6:
452	case SIOCGIFNETMASK_IN6:
453	case SIOCGIFDSTADDR_IN6:
454	case SIOCGIFALIFETIME_IN6:
455		/* must think again about its semantics */
456		if (ia == NULL) {
457			error = EADDRNOTAVAIL;
458			goto out;
459		}
460		break;
461
462	case SIOCSIFALIFETIME_IN6:
463	    {
464		struct in6_addrlifetime *lt;
465
466		if (td != NULL) {
467			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
468			if (error)
469				goto out;
470		}
471		if (ia == NULL) {
472			error = EADDRNOTAVAIL;
473			goto out;
474		}
475		/* sanity for overflow - beware unsigned */
476		lt = &ifr->ifr_ifru.ifru_lifetime;
477		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
478		    lt->ia6t_vltime + time_uptime < time_uptime) {
479			error = EINVAL;
480			goto out;
481		}
482		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
483		    lt->ia6t_pltime + time_uptime < time_uptime) {
484			error = EINVAL;
485			goto out;
486		}
487		break;
488	    }
489	}
490
491	switch (cmd) {
492	case SIOCGIFADDR_IN6:
493		ifr->ifr_addr = ia->ia_addr;
494		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
495			goto out;
496		break;
497
498	case SIOCGIFDSTADDR_IN6:
499		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
500			error = EINVAL;
501			goto out;
502		}
503		/*
504		 * XXX: should we check if ifa_dstaddr is NULL and return
505		 * an error?
506		 */
507		ifr->ifr_dstaddr = ia->ia_dstaddr;
508		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
509			goto out;
510		break;
511
512	case SIOCGIFNETMASK_IN6:
513		ifr->ifr_addr = ia->ia_prefixmask;
514		break;
515
516	case SIOCGIFAFLAG_IN6:
517		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
518		break;
519
520	case SIOCGIFSTAT_IN6:
521		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
522		    ifp->if_afdata[AF_INET6])->in6_ifstat,
523		    &ifr->ifr_ifru.ifru_stat,
524		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
525		break;
526
527	case SIOCGIFSTAT_ICMP6:
528		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
529		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
530		    &ifr->ifr_ifru.ifru_icmp6stat,
531		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
532		break;
533
534	case SIOCGIFALIFETIME_IN6:
535		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
536		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
537			time_t maxexpire;
538			struct in6_addrlifetime *retlt =
539			    &ifr->ifr_ifru.ifru_lifetime;
540
541			/*
542			 * XXX: adjust expiration time assuming time_t is
543			 * signed.
544			 */
545			maxexpire = (-1) &
546			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
547			if (ia->ia6_lifetime.ia6t_vltime <
548			    maxexpire - ia->ia6_updatetime) {
549				retlt->ia6t_expire = ia->ia6_updatetime +
550				    ia->ia6_lifetime.ia6t_vltime;
551			} else
552				retlt->ia6t_expire = maxexpire;
553		}
554		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
555			time_t maxexpire;
556			struct in6_addrlifetime *retlt =
557			    &ifr->ifr_ifru.ifru_lifetime;
558
559			/*
560			 * XXX: adjust expiration time assuming time_t is
561			 * signed.
562			 */
563			maxexpire = (-1) &
564			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
565			if (ia->ia6_lifetime.ia6t_pltime <
566			    maxexpire - ia->ia6_updatetime) {
567				retlt->ia6t_preferred = ia->ia6_updatetime +
568				    ia->ia6_lifetime.ia6t_pltime;
569			} else
570				retlt->ia6t_preferred = maxexpire;
571		}
572		break;
573
574	case SIOCSIFALIFETIME_IN6:
575		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
576		/* for sanity */
577		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
578			ia->ia6_lifetime.ia6t_expire =
579				time_uptime + ia->ia6_lifetime.ia6t_vltime;
580		} else
581			ia->ia6_lifetime.ia6t_expire = 0;
582		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
583			ia->ia6_lifetime.ia6t_preferred =
584				time_uptime + ia->ia6_lifetime.ia6t_pltime;
585		} else
586			ia->ia6_lifetime.ia6t_preferred = 0;
587		break;
588
589	case SIOCAIFADDR_IN6:
590	{
591		struct nd_prefixctl pr0;
592		struct nd_prefix *pr;
593
594		/*
595		 * first, make or update the interface address structure,
596		 * and link it to the list.
597		 */
598		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
599			goto out;
600		if (ia != NULL)
601			ifa_free(&ia->ia_ifa);
602		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
603		    == NULL) {
604			/*
605			 * this can happen when the user specify the 0 valid
606			 * lifetime.
607			 */
608			break;
609		}
610
611		if (cmd == ocmd && ifra->ifra_vhid > 0) {
612			if (carp_attach_p != NULL)
613				error = (*carp_attach_p)(&ia->ia_ifa,
614				    ifra->ifra_vhid);
615			else
616				error = EPROTONOSUPPORT;
617			if (error)
618				goto out;
619			else
620				carp_attached = 1;
621		}
622
623		/*
624		 * then, make the prefix on-link on the interface.
625		 * XXX: we'd rather create the prefix before the address, but
626		 * we need at least one address to install the corresponding
627		 * interface route, so we configure the address first.
628		 */
629
630		/*
631		 * convert mask to prefix length (prefixmask has already
632		 * been validated in in6_update_ifa().
633		 */
634		bzero(&pr0, sizeof(pr0));
635		pr0.ndpr_ifp = ifp;
636		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
637		    NULL);
638		if (pr0.ndpr_plen == 128) {
639			/* we don't need to install a host route. */
640			goto aifaddr_out;
641		}
642		pr0.ndpr_prefix = ifra->ifra_addr;
643		/* apply the mask for safety. */
644		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
645		    &ifra->ifra_prefixmask.sin6_addr);
646
647		/*
648		 * XXX: since we don't have an API to set prefix (not address)
649		 * lifetimes, we just use the same lifetimes as addresses.
650		 * The (temporarily) installed lifetimes can be overridden by
651		 * later advertised RAs (when accept_rtadv is non 0), which is
652		 * an intended behavior.
653		 */
654		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
655		pr0.ndpr_raf_auto =
656		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
657		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
658		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
659
660		/* add the prefix if not yet. */
661		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
662			/*
663			 * nd6_prelist_add will install the corresponding
664			 * interface route.
665			 */
666			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
667				if (carp_attached)
668					(*carp_detach_p)(&ia->ia_ifa);
669				goto out;
670			}
671			if (pr == NULL) {
672				if (carp_attached)
673					(*carp_detach_p)(&ia->ia_ifa);
674				log(LOG_ERR, "nd6_prelist_add succeeded but "
675				    "no prefix\n");
676				error = EINVAL;
677				goto out;
678			}
679		}
680
681		/* relate the address to the prefix */
682		if (ia->ia6_ndpr == NULL) {
683			ia->ia6_ndpr = pr;
684			pr->ndpr_refcnt++;
685
686			/*
687			 * If this is the first autoconf address from the
688			 * prefix, create a temporary address as well
689			 * (when required).
690			 */
691			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
692			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
693				int e;
694				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
695					log(LOG_NOTICE, "in6_control: failed "
696					    "to create a temporary address, "
697					    "errno=%d\n", e);
698				}
699			}
700		}
701
702		/*
703		 * this might affect the status of autoconfigured addresses,
704		 * that is, this address might make other addresses detached.
705		 */
706		pfxlist_onlink_check();
707aifaddr_out:
708		if (error != 0 || ia == NULL)
709			break;
710		/*
711		 * Try to clear the flag when a new IPv6 address is added
712		 * onto an IFDISABLED interface and it succeeds.
713		 */
714		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
715			struct in6_ndireq nd;
716
717			memset(&nd, 0, sizeof(nd));
718			nd.ndi.flags = ND_IFINFO(ifp)->flags;
719			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
720			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
721				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
722				    "SIOCSIFINFO_FLAGS for -ifdisabled "
723				    "failed.");
724			/*
725			 * Ignore failure of clearing the flag intentionally.
726			 * The failure means address duplication was detected.
727			 */
728		}
729		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
730		break;
731	}
732
733	case SIOCDIFADDR_IN6:
734	{
735		struct nd_prefix *pr;
736
737		/*
738		 * If the address being deleted is the only one that owns
739		 * the corresponding prefix, expire the prefix as well.
740		 * XXX: theoretically, we don't have to worry about such
741		 * relationship, since we separate the address management
742		 * and the prefix management.  We do this, however, to provide
743		 * as much backward compatibility as possible in terms of
744		 * the ioctl operation.
745		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
746		 */
747		pr = ia->ia6_ndpr;
748		in6_purgeaddr(&ia->ia_ifa);
749		if (pr && pr->ndpr_refcnt == 0)
750			prelist_remove(pr);
751		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
752		break;
753	}
754
755	default:
756		if (ifp->if_ioctl == NULL) {
757			error = EOPNOTSUPP;
758			goto out;
759		}
760		error = (*ifp->if_ioctl)(ifp, cmd, data);
761		goto out;
762	}
763
764	error = 0;
765out:
766	if (ia != NULL)
767		ifa_free(&ia->ia_ifa);
768	return (error);
769}
770
771
772/*
773 * Join necessary multicast groups.  Factored out from in6_update_ifa().
774 * This entire work should only be done once, for the default FIB.
775 */
776static int
777in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
778    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
779{
780	char ip6buf[INET6_ADDRSTRLEN];
781	struct in6_addr mltaddr;
782	struct in6_multi_mship *imm;
783	int delay, error;
784
785	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
786
787	/* Join solicited multicast addr for new host id. */
788	bzero(&mltaddr, sizeof(struct in6_addr));
789	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
790	mltaddr.s6_addr32[2] = htonl(1);
791	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
792	mltaddr.s6_addr8[12] = 0xff;
793	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
794		/* XXX: should not happen */
795		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
796		goto cleanup;
797	}
798	delay = error = 0;
799	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
800		/*
801		 * We need a random delay for DAD on the address being
802		 * configured.  It also means delaying transmission of the
803		 * corresponding MLD report to avoid report collision.
804		 * [RFC 4861, Section 6.3.7]
805		 */
806		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
807	}
808	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
809	if (imm == NULL) {
810		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
811		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
812		    if_name(ifp), error));
813		goto cleanup;
814	}
815	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
816	*in6m_sol = imm->i6mm_maddr;
817
818	/*
819	 * Join link-local all-nodes address.
820	 */
821	mltaddr = in6addr_linklocal_allnodes;
822	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
823		goto cleanup; /* XXX: should not fail */
824
825	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
826	if (imm == NULL) {
827		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
828		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
829		    if_name(ifp), error));
830		goto cleanup;
831	}
832	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
833
834	/*
835	 * Join node information group address.
836	 */
837	delay = 0;
838	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
839		/*
840		 * The spec does not say anything about delay for this group,
841		 * but the same logic should apply.
842		 */
843		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
844	}
845	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
846		/* XXX jinmei */
847		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
848		if (imm == NULL)
849			nd6log((LOG_WARNING,
850			    "%s: in6_joingroup failed for %s on %s "
851			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
852			    &mltaddr), if_name(ifp), error));
853			/* XXX not very fatal, go on... */
854		else
855			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
856	}
857	if (V_icmp6_nodeinfo_oldmcprefix &&
858	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
859		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
860		if (imm == NULL)
861			nd6log((LOG_WARNING,
862			    "%s: in6_joingroup failed for %s on %s "
863			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
864			    &mltaddr), if_name(ifp), error));
865			/* XXX not very fatal, go on... */
866		else
867			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
868	}
869
870	/*
871	 * Join interface-local all-nodes address.
872	 * (ff01::1%ifN, and ff01::%ifN/32)
873	 */
874	mltaddr = in6addr_nodelocal_allnodes;
875	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
876		goto cleanup; /* XXX: should not fail */
877
878	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
879	if (imm == NULL) {
880		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
881		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
882		    &mltaddr), if_name(ifp), error));
883		goto cleanup;
884	}
885	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
886
887cleanup:
888	return (error);
889}
890
891/*
892 * Update parameters of an IPv6 interface address.
893 * If necessary, a new entry is created and linked into address chains.
894 * This function is separated from in6_control().
895 */
896int
897in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
898    struct in6_ifaddr *ia, int flags)
899{
900	int error, hostIsNew = 0;
901
902	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
903		return (error);
904
905	if (ia == NULL) {
906		hostIsNew = 1;
907		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
908			return (ENOBUFS);
909	}
910
911	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
912	if (error != 0) {
913		if (hostIsNew != 0) {
914			in6_unlink_ifa(ia, ifp);
915			ifa_free(&ia->ia_ifa);
916		}
917		return (error);
918	}
919
920	if (hostIsNew)
921		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
922
923	return (error);
924}
925
926/*
927 * Fill in basic IPv6 address request info.
928 */
929void
930in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
931    const struct in6_addr *mask)
932{
933
934	memset(ifra, 0, sizeof(struct in6_aliasreq));
935
936	ifra->ifra_addr.sin6_family = AF_INET6;
937	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
938	if (addr != NULL)
939		ifra->ifra_addr.sin6_addr = *addr;
940
941	ifra->ifra_prefixmask.sin6_family = AF_INET6;
942	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
943	if (mask != NULL)
944		ifra->ifra_prefixmask.sin6_addr = *mask;
945}
946
947static int
948in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
949    struct in6_ifaddr *ia, int flags)
950{
951	int plen = -1;
952	struct sockaddr_in6 dst6;
953	struct in6_addrlifetime *lt;
954	char ip6buf[INET6_ADDRSTRLEN];
955
956	/* Validate parameters */
957	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
958		return (EINVAL);
959
960	/*
961	 * The destination address for a p2p link must have a family
962	 * of AF_UNSPEC or AF_INET6.
963	 */
964	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
965	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
966	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
967		return (EAFNOSUPPORT);
968
969	/*
970	 * Validate address
971	 */
972	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
973	    ifra->ifra_addr.sin6_family != AF_INET6)
974		return (EINVAL);
975
976	/*
977	 * validate ifra_prefixmask.  don't check sin6_family, netmask
978	 * does not carry fields other than sin6_len.
979	 */
980	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
981		return (EINVAL);
982	/*
983	 * Because the IPv6 address architecture is classless, we require
984	 * users to specify a (non 0) prefix length (mask) for a new address.
985	 * We also require the prefix (when specified) mask is valid, and thus
986	 * reject a non-consecutive mask.
987	 */
988	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
989		return (EINVAL);
990	if (ifra->ifra_prefixmask.sin6_len != 0) {
991		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
992		    (u_char *)&ifra->ifra_prefixmask +
993		    ifra->ifra_prefixmask.sin6_len);
994		if (plen <= 0)
995			return (EINVAL);
996	} else {
997		/*
998		 * In this case, ia must not be NULL.  We just use its prefix
999		 * length.
1000		 */
1001		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1002	}
1003	/*
1004	 * If the destination address on a p2p interface is specified,
1005	 * and the address is a scoped one, validate/set the scope
1006	 * zone identifier.
1007	 */
1008	dst6 = ifra->ifra_dstaddr;
1009	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1010	    (dst6.sin6_family == AF_INET6)) {
1011		struct in6_addr in6_tmp;
1012		u_int32_t zoneid;
1013
1014		in6_tmp = dst6.sin6_addr;
1015		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1016			return (EINVAL); /* XXX: should be impossible */
1017
1018		if (dst6.sin6_scope_id != 0) {
1019			if (dst6.sin6_scope_id != zoneid)
1020				return (EINVAL);
1021		} else		/* user omit to specify the ID. */
1022			dst6.sin6_scope_id = zoneid;
1023
1024		/* convert into the internal form */
1025		if (sa6_embedscope(&dst6, 0))
1026			return (EINVAL); /* XXX: should be impossible */
1027	}
1028	/* Modify original ifra_dstaddr to reflect changes */
1029	ifra->ifra_dstaddr = dst6;
1030
1031	/*
1032	 * The destination address can be specified only for a p2p or a
1033	 * loopback interface.  If specified, the corresponding prefix length
1034	 * must be 128.
1035	 */
1036	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1037		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1038			/* XXX: noisy message */
1039			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1040			    "be specified for a p2p or a loopback IF only\n"));
1041			return (EINVAL);
1042		}
1043		if (plen != 128) {
1044			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1045			    "be 128 when dstaddr is specified\n"));
1046			return (EINVAL);
1047		}
1048	}
1049	/* lifetime consistency check */
1050	lt = &ifra->ifra_lifetime;
1051	if (lt->ia6t_pltime > lt->ia6t_vltime)
1052		return (EINVAL);
1053	if (lt->ia6t_vltime == 0) {
1054		/*
1055		 * the following log might be noisy, but this is a typical
1056		 * configuration mistake or a tool's bug.
1057		 */
1058		nd6log((LOG_INFO,
1059		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1060		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1061
1062		if (ia == NULL)
1063			return (0); /* there's nothing to do */
1064	}
1065
1066	/* Check prefix mask */
1067	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1068		/*
1069		 * We prohibit changing the prefix length of an existing
1070		 * address, because
1071		 * + such an operation should be rare in IPv6, and
1072		 * + the operation would confuse prefix management.
1073		 */
1074		if (ia->ia_prefixmask.sin6_len != 0 &&
1075		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1076			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1077			    "of an existing %s address should not be changed\n",
1078			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1079
1080			return (EINVAL);
1081		}
1082	}
1083
1084	return (0);
1085}
1086
1087
1088/*
1089 * Allocate a new ifaddr and link it into chains.
1090 */
1091static struct in6_ifaddr *
1092in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1093{
1094	struct in6_ifaddr *ia;
1095
1096	/*
1097	 * When in6_alloc_ifa() is called in a process of a received
1098	 * RA, it is called under an interrupt context.  So, we should
1099	 * call malloc with M_NOWAIT.
1100	 */
1101	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1102	if (ia == NULL)
1103		return (NULL);
1104	LIST_INIT(&ia->ia6_memberships);
1105	/* Initialize the address and masks, and put time stamp */
1106	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1107	ia->ia_addr.sin6_family = AF_INET6;
1108	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1109	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1110	ia->ia_addr = ifra->ifra_addr;
1111	ia->ia6_createtime = time_uptime;
1112	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1113		/*
1114		 * Some functions expect that ifa_dstaddr is not
1115		 * NULL for p2p interfaces.
1116		 */
1117		ia->ia_ifa.ifa_dstaddr =
1118		    (struct sockaddr *)&ia->ia_dstaddr;
1119	} else {
1120		ia->ia_ifa.ifa_dstaddr = NULL;
1121	}
1122
1123	/* set prefix mask if any */
1124	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1125	if (ifra->ifra_prefixmask.sin6_len != 0) {
1126		ia->ia_prefixmask.sin6_family = AF_INET6;
1127		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1128		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1129	}
1130
1131	ia->ia_ifp = ifp;
1132	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1133	IF_ADDR_WLOCK(ifp);
1134	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1135	IF_ADDR_WUNLOCK(ifp);
1136
1137	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1138	IN6_IFADDR_WLOCK();
1139	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1140	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1141	IN6_IFADDR_WUNLOCK();
1142
1143	return (ia);
1144}
1145
1146/*
1147 * Update/configure interface address parameters:
1148 *
1149 * 1) Update lifetime
1150 * 2) Update interface metric ad flags
1151 * 3) Notify other subsystems
1152 */
1153static int
1154in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1155    struct in6_ifaddr *ia, int hostIsNew, int flags)
1156{
1157	int error;
1158
1159	/* update timestamp */
1160	ia->ia6_updatetime = time_uptime;
1161
1162	/*
1163	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1164	 * to see if the address is deprecated or invalidated, but initialize
1165	 * these members for applications.
1166	 */
1167	ia->ia6_lifetime = ifra->ifra_lifetime;
1168	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1169		ia->ia6_lifetime.ia6t_expire =
1170		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1171	} else
1172		ia->ia6_lifetime.ia6t_expire = 0;
1173	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1174		ia->ia6_lifetime.ia6t_preferred =
1175		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1176	} else
1177		ia->ia6_lifetime.ia6t_preferred = 0;
1178
1179	/*
1180	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1181	 * userland, make it deprecated.
1182	 */
1183	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1184		ia->ia6_lifetime.ia6t_pltime = 0;
1185		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1186	}
1187
1188	/*
1189	 * configure address flags.
1190	 */
1191	ia->ia6_flags = ifra->ifra_flags;
1192
1193	/*
1194	 * Make the address tentative before joining multicast addresses,
1195	 * so that corresponding MLD responses would not have a tentative
1196	 * source address.
1197	 */
1198	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1199	if (hostIsNew && in6if_do_dad(ifp))
1200		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1201
1202	/* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1203	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1204		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1205
1206	/* notify other subsystems */
1207	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1208
1209	return (error);
1210}
1211
1212/*
1213 * Do link-level ifa job:
1214 * 1) Add lle entry for added address
1215 * 2) Notifies routing socket users about new address
1216 * 3) join appropriate multicast group
1217 * 4) start DAD if enabled
1218 */
1219static int
1220in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1221    struct in6_ifaddr *ia, int flags)
1222{
1223	struct in6_multi *in6m_sol;
1224	int error = 0;
1225
1226	/* Add local address to lltable, if necessary (ex. on p2p link). */
1227	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1228		in6_purgeaddr(&ia->ia_ifa);
1229		ifa_free(&ia->ia_ifa);
1230		return (error);
1231	}
1232
1233	/* Join necessary multicast groups. */
1234	in6m_sol = NULL;
1235	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1236		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1237		if (error != 0) {
1238			in6_purgeaddr(&ia->ia_ifa);
1239			ifa_free(&ia->ia_ifa);
1240			return (error);
1241		}
1242	}
1243
1244	/*
1245	 * Perform DAD, if needed.
1246	 * XXX It may be of use, if we can administratively disable DAD.
1247	 */
1248	if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1249	    (ia->ia6_flags & IN6_IFF_TENTATIVE))
1250	{
1251		int delay, mindelay, maxdelay;
1252
1253		delay = 0;
1254		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1255			/*
1256			 * We need to impose a delay before sending an NS
1257			 * for DAD.  Check if we also needed a delay for the
1258			 * corresponding MLD message.  If we did, the delay
1259			 * should be larger than the MLD delay (this could be
1260			 * relaxed a bit, but this simple logic is at least
1261			 * safe).
1262			 * XXX: Break data hiding guidelines and look at
1263			 * state for the solicited multicast group.
1264			 */
1265			mindelay = 0;
1266			if (in6m_sol != NULL &&
1267			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1268				mindelay = in6m_sol->in6m_timer;
1269			}
1270			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1271			if (maxdelay - mindelay == 0)
1272				delay = 0;
1273			else {
1274				delay =
1275				    (arc4random() % (maxdelay - mindelay)) +
1276				    mindelay;
1277			}
1278		}
1279		nd6_dad_start((struct ifaddr *)ia, delay);
1280	}
1281
1282	ifa_free(&ia->ia_ifa);
1283	return (error);
1284}
1285
1286void
1287in6_purgeaddr(struct ifaddr *ifa)
1288{
1289	struct ifnet *ifp = ifa->ifa_ifp;
1290	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1291	struct in6_multi_mship *imm;
1292	int plen, error;
1293
1294	if (ifa->ifa_carp)
1295		(*carp_detach_p)(ifa);
1296
1297	/*
1298	 * Remove the loopback route to the interface address.
1299	 * The check for the current setting of "nd6_useloopback"
1300	 * is not needed.
1301	 */
1302	if (ia->ia_flags & IFA_RTSELF) {
1303		error = ifa_del_loopback_route((struct ifaddr *)ia,
1304		    (struct sockaddr *)&ia->ia_addr);
1305		if (error == 0)
1306			ia->ia_flags &= ~IFA_RTSELF;
1307	}
1308
1309	/* stop DAD processing */
1310	nd6_dad_stop(ifa);
1311
1312	/* Remove local address entry from lltable. */
1313	nd6_rem_ifa_lle(ia);
1314
1315	/* Leave multicast groups. */
1316	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1317		LIST_REMOVE(imm, i6mm_chain);
1318		in6_leavegroup(imm);
1319	}
1320	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1321	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1322		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1323		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1324		if (error != 0)
1325			log(LOG_INFO, "%s: err=%d, destination address delete "
1326			    "failed\n", __func__, error);
1327		ia->ia_flags &= ~IFA_ROUTE;
1328	}
1329
1330	in6_unlink_ifa(ia, ifp);
1331}
1332
1333static void
1334in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1335{
1336	char ip6buf[INET6_ADDRSTRLEN];
1337
1338	IF_ADDR_WLOCK(ifp);
1339	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1340	IF_ADDR_WUNLOCK(ifp);
1341	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1342
1343	/*
1344	 * Defer the release of what might be the last reference to the
1345	 * in6_ifaddr so that it can't be freed before the remainder of the
1346	 * cleanup.
1347	 */
1348	IN6_IFADDR_WLOCK();
1349	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1350	LIST_REMOVE(ia, ia6_hash);
1351	IN6_IFADDR_WUNLOCK();
1352
1353	/*
1354	 * Release the reference to the base prefix.  There should be a
1355	 * positive reference.
1356	 */
1357	if (ia->ia6_ndpr == NULL) {
1358		nd6log((LOG_NOTICE,
1359		    "in6_unlink_ifa: autoconf'ed address "
1360		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1361	} else {
1362		ia->ia6_ndpr->ndpr_refcnt--;
1363		ia->ia6_ndpr = NULL;
1364	}
1365
1366	/*
1367	 * Also, if the address being removed is autoconf'ed, call
1368	 * pfxlist_onlink_check() since the release might affect the status of
1369	 * other (detached) addresses.
1370	 */
1371	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1372		pfxlist_onlink_check();
1373	}
1374	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1375}
1376
1377/*
1378 * Notifies other other subsystems about address change/arrival:
1379 * 1) Notifies device handler on first IPv6 address assignment
1380 * 2) Handle routing table changes for P2P links and route
1381 * 3) Handle routing table changes for address host route
1382 */
1383static int
1384in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1385    struct in6_aliasreq *ifra, int hostIsNew)
1386{
1387	int	error = 0, plen, ifacount = 0;
1388	struct ifaddr *ifa;
1389	struct sockaddr_in6 *pdst;
1390	char ip6buf[INET6_ADDRSTRLEN];
1391
1392	/*
1393	 * Give the interface a chance to initialize
1394	 * if this is its first address,
1395	 */
1396	if (hostIsNew != 0) {
1397		IF_ADDR_RLOCK(ifp);
1398		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1399			if (ifa->ifa_addr->sa_family != AF_INET6)
1400				continue;
1401			ifacount++;
1402		}
1403		IF_ADDR_RUNLOCK(ifp);
1404	}
1405
1406	if (ifacount <= 1 && ifp->if_ioctl) {
1407		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1408		if (error)
1409			return (error);
1410	}
1411
1412	/*
1413	 * If a new destination address is specified, scrub the old one and
1414	 * install the new destination.  Note that the interface must be
1415	 * p2p or loopback.
1416	 */
1417	pdst = &ifra->ifra_dstaddr;
1418	if (pdst->sin6_family == AF_INET6 &&
1419	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1420		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1421		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1422			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1423			    "remove a route to the old destination: %s\n",
1424			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1425			/* proceed anyway... */
1426		} else
1427			ia->ia_flags &= ~IFA_ROUTE;
1428		ia->ia_dstaddr = *pdst;
1429	}
1430
1431	/*
1432	 * If a new destination address is specified for a point-to-point
1433	 * interface, install a route to the destination as an interface
1434	 * direct route.
1435	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1436	 * interface that share the same destination.
1437	 */
1438	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1439	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1440	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1441		int rtflags = RTF_UP | RTF_HOST;
1442		/*
1443		 * Handle the case for ::1 .
1444		 */
1445		if (ifp->if_flags & IFF_LOOPBACK)
1446			ia->ia_flags |= IFA_RTSELF;
1447		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1448		if (error)
1449			return (error);
1450		ia->ia_flags |= IFA_ROUTE;
1451	}
1452
1453	/*
1454	 * add a loopback route to self if not exists
1455	 */
1456	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1457		error = ifa_add_loopback_route((struct ifaddr *)ia,
1458		    (struct sockaddr *)&ia->ia_addr);
1459		if (error == 0)
1460			ia->ia_flags |= IFA_RTSELF;
1461	}
1462
1463	return (error);
1464}
1465
1466/*
1467 * Find an IPv6 interface link-local address specific to an interface.
1468 * ifaddr is returned referenced.
1469 */
1470struct in6_ifaddr *
1471in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1472{
1473	struct ifaddr *ifa;
1474
1475	IF_ADDR_RLOCK(ifp);
1476	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1477		if (ifa->ifa_addr->sa_family != AF_INET6)
1478			continue;
1479		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1480			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1481			    ignoreflags) != 0)
1482				continue;
1483			ifa_ref(ifa);
1484			break;
1485		}
1486	}
1487	IF_ADDR_RUNLOCK(ifp);
1488
1489	return ((struct in6_ifaddr *)ifa);
1490}
1491
1492
1493/*
1494 * find the internet address corresponding to a given address.
1495 * ifaddr is returned referenced.
1496 */
1497struct in6_ifaddr *
1498in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1499{
1500	struct in6_ifaddr *ia;
1501
1502	IN6_IFADDR_RLOCK();
1503	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1504		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1505			if (zoneid != 0 &&
1506			    zoneid != ia->ia_addr.sin6_scope_id)
1507				continue;
1508			ifa_ref(&ia->ia_ifa);
1509			break;
1510		}
1511	}
1512	IN6_IFADDR_RUNLOCK();
1513	return (ia);
1514}
1515
1516/*
1517 * find the internet address corresponding to a given interface and address.
1518 * ifaddr is returned referenced.
1519 */
1520struct in6_ifaddr *
1521in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1522{
1523	struct ifaddr *ifa;
1524
1525	IF_ADDR_RLOCK(ifp);
1526	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1527		if (ifa->ifa_addr->sa_family != AF_INET6)
1528			continue;
1529		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1530			ifa_ref(ifa);
1531			break;
1532		}
1533	}
1534	IF_ADDR_RUNLOCK(ifp);
1535
1536	return ((struct in6_ifaddr *)ifa);
1537}
1538
1539/*
1540 * Find a link-local scoped address on ifp and return it if any.
1541 */
1542struct in6_ifaddr *
1543in6ifa_llaonifp(struct ifnet *ifp)
1544{
1545	struct sockaddr_in6 *sin6;
1546	struct ifaddr *ifa;
1547
1548	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1549		return (NULL);
1550	if_addr_rlock(ifp);
1551	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1552		if (ifa->ifa_addr->sa_family != AF_INET6)
1553			continue;
1554		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1555		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1556		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1557		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1558			break;
1559	}
1560	if_addr_runlock(ifp);
1561
1562	return ((struct in6_ifaddr *)ifa);
1563}
1564
1565/*
1566 * Convert IP6 address to printable (loggable) representation. Caller
1567 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1568 */
1569static char digits[] = "0123456789abcdef";
1570char *
1571ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1572{
1573	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1574	char *cp;
1575	const u_int16_t *a = (const u_int16_t *)addr;
1576	const u_int8_t *d;
1577	int dcolon = 0, zero = 0;
1578
1579	cp = ip6buf;
1580
1581	for (i = 0; i < 8; i++) {
1582		if (*(a + i) == 0) {
1583			cnt++;
1584			if (cnt == 1)
1585				idx = i;
1586		}
1587		else if (maxcnt < cnt) {
1588			maxcnt = cnt;
1589			index = idx;
1590			cnt = 0;
1591		}
1592	}
1593	if (maxcnt < cnt) {
1594		maxcnt = cnt;
1595		index = idx;
1596	}
1597
1598	for (i = 0; i < 8; i++) {
1599		if (dcolon == 1) {
1600			if (*a == 0) {
1601				if (i == 7)
1602					*cp++ = ':';
1603				a++;
1604				continue;
1605			} else
1606				dcolon = 2;
1607		}
1608		if (*a == 0) {
1609			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1610				if (i == 0)
1611					*cp++ = ':';
1612				*cp++ = ':';
1613				dcolon = 1;
1614			} else {
1615				*cp++ = '0';
1616				*cp++ = ':';
1617			}
1618			a++;
1619			continue;
1620		}
1621		d = (const u_char *)a;
1622		/* Try to eliminate leading zeros in printout like in :0001. */
1623		zero = 1;
1624		*cp = digits[*d >> 4];
1625		if (*cp != '0') {
1626			zero = 0;
1627			cp++;
1628		}
1629		*cp = digits[*d++ & 0xf];
1630		if (zero == 0 || (*cp != '0')) {
1631			zero = 0;
1632			cp++;
1633		}
1634		*cp = digits[*d >> 4];
1635		if (zero == 0 || (*cp != '0')) {
1636			zero = 0;
1637			cp++;
1638		}
1639		*cp++ = digits[*d & 0xf];
1640		*cp++ = ':';
1641		a++;
1642	}
1643	*--cp = '\0';
1644	return (ip6buf);
1645}
1646
1647int
1648in6_localaddr(struct in6_addr *in6)
1649{
1650	struct in6_ifaddr *ia;
1651
1652	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1653		return 1;
1654
1655	IN6_IFADDR_RLOCK();
1656	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1657		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1658		    &ia->ia_prefixmask.sin6_addr)) {
1659			IN6_IFADDR_RUNLOCK();
1660			return 1;
1661		}
1662	}
1663	IN6_IFADDR_RUNLOCK();
1664
1665	return (0);
1666}
1667
1668/*
1669 * Return 1 if an internet address is for the local host and configured
1670 * on one of its interfaces.
1671 */
1672int
1673in6_localip(struct in6_addr *in6)
1674{
1675	struct in6_ifaddr *ia;
1676
1677	IN6_IFADDR_RLOCK();
1678	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1679		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1680			IN6_IFADDR_RUNLOCK();
1681			return (1);
1682		}
1683	}
1684	IN6_IFADDR_RUNLOCK();
1685	return (0);
1686}
1687
1688/*
1689 * Return 1 if an internet address is configured on an interface.
1690 */
1691int
1692in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1693{
1694	struct in6_addr in6;
1695	struct ifaddr *ifa;
1696	struct in6_ifaddr *ia6;
1697
1698	in6 = *addr;
1699	if (in6_clearscope(&in6))
1700		return (0);
1701	in6_setscope(&in6, ifp, NULL);
1702
1703	IF_ADDR_RLOCK(ifp);
1704	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1705		if (ifa->ifa_addr->sa_family != AF_INET6)
1706			continue;
1707		ia6 = (struct in6_ifaddr *)ifa;
1708		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1709			IF_ADDR_RUNLOCK(ifp);
1710			return (1);
1711		}
1712	}
1713	IF_ADDR_RUNLOCK(ifp);
1714
1715	return (0);
1716}
1717
1718int
1719in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1720{
1721	struct in6_ifaddr *ia;
1722
1723	IN6_IFADDR_RLOCK();
1724	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1725		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1726			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1727				IN6_IFADDR_RUNLOCK();
1728				return (1); /* true */
1729			}
1730			break;
1731		}
1732	}
1733	IN6_IFADDR_RUNLOCK();
1734
1735	return (0);		/* false */
1736}
1737
1738/*
1739 * return length of part which dst and src are equal
1740 * hard coding...
1741 */
1742int
1743in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1744{
1745	int match = 0;
1746	u_char *s = (u_char *)src, *d = (u_char *)dst;
1747	u_char *lim = s + 16, r;
1748
1749	while (s < lim)
1750		if ((r = (*d++ ^ *s++)) != 0) {
1751			while (r < 128) {
1752				match++;
1753				r <<= 1;
1754			}
1755			break;
1756		} else
1757			match += 8;
1758	return match;
1759}
1760
1761/* XXX: to be scope conscious */
1762int
1763in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1764{
1765	int bytelen, bitlen;
1766
1767	/* sanity check */
1768	if (0 > len || len > 128) {
1769		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1770		    len);
1771		return (0);
1772	}
1773
1774	bytelen = len / 8;
1775	bitlen = len % 8;
1776
1777	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1778		return (0);
1779	if (bitlen != 0 &&
1780	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1781	    p2->s6_addr[bytelen] >> (8 - bitlen))
1782		return (0);
1783
1784	return (1);
1785}
1786
1787void
1788in6_prefixlen2mask(struct in6_addr *maskp, int len)
1789{
1790	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1791	int bytelen, bitlen, i;
1792
1793	/* sanity check */
1794	if (0 > len || len > 128) {
1795		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1796		    len);
1797		return;
1798	}
1799
1800	bzero(maskp, sizeof(*maskp));
1801	bytelen = len / 8;
1802	bitlen = len % 8;
1803	for (i = 0; i < bytelen; i++)
1804		maskp->s6_addr[i] = 0xff;
1805	if (bitlen)
1806		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1807}
1808
1809/*
1810 * return the best address out of the same scope. if no address was
1811 * found, return the first valid address from designated IF.
1812 */
1813struct in6_ifaddr *
1814in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1815{
1816	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1817	struct ifaddr *ifa;
1818	struct in6_ifaddr *besta = 0;
1819	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1820
1821	dep[0] = dep[1] = NULL;
1822
1823	/*
1824	 * We first look for addresses in the same scope.
1825	 * If there is one, return it.
1826	 * If two or more, return one which matches the dst longest.
1827	 * If none, return one of global addresses assigned other ifs.
1828	 */
1829	IF_ADDR_RLOCK(ifp);
1830	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1831		if (ifa->ifa_addr->sa_family != AF_INET6)
1832			continue;
1833		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1834			continue; /* XXX: is there any case to allow anycast? */
1835		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1836			continue; /* don't use this interface */
1837		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1838			continue;
1839		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1840			if (V_ip6_use_deprecated)
1841				dep[0] = (struct in6_ifaddr *)ifa;
1842			continue;
1843		}
1844
1845		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1846			/*
1847			 * call in6_matchlen() as few as possible
1848			 */
1849			if (besta) {
1850				if (blen == -1)
1851					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1852				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1853				if (tlen > blen) {
1854					blen = tlen;
1855					besta = (struct in6_ifaddr *)ifa;
1856				}
1857			} else
1858				besta = (struct in6_ifaddr *)ifa;
1859		}
1860	}
1861	if (besta) {
1862		ifa_ref(&besta->ia_ifa);
1863		IF_ADDR_RUNLOCK(ifp);
1864		return (besta);
1865	}
1866
1867	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1868		if (ifa->ifa_addr->sa_family != AF_INET6)
1869			continue;
1870		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1871			continue; /* XXX: is there any case to allow anycast? */
1872		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1873			continue; /* don't use this interface */
1874		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1875			continue;
1876		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1877			if (V_ip6_use_deprecated)
1878				dep[1] = (struct in6_ifaddr *)ifa;
1879			continue;
1880		}
1881
1882		if (ifa != NULL)
1883			ifa_ref(ifa);
1884		IF_ADDR_RUNLOCK(ifp);
1885		return (struct in6_ifaddr *)ifa;
1886	}
1887
1888	/* use the last-resort values, that are, deprecated addresses */
1889	if (dep[0]) {
1890		ifa_ref((struct ifaddr *)dep[0]);
1891		IF_ADDR_RUNLOCK(ifp);
1892		return dep[0];
1893	}
1894	if (dep[1]) {
1895		ifa_ref((struct ifaddr *)dep[1]);
1896		IF_ADDR_RUNLOCK(ifp);
1897		return dep[1];
1898	}
1899
1900	IF_ADDR_RUNLOCK(ifp);
1901	return NULL;
1902}
1903
1904/*
1905 * perform DAD when interface becomes IFF_UP.
1906 */
1907void
1908in6_if_up(struct ifnet *ifp)
1909{
1910	struct ifaddr *ifa;
1911	struct in6_ifaddr *ia;
1912
1913	IF_ADDR_RLOCK(ifp);
1914	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1915		if (ifa->ifa_addr->sa_family != AF_INET6)
1916			continue;
1917		ia = (struct in6_ifaddr *)ifa;
1918		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1919			/*
1920			 * The TENTATIVE flag was likely set by hand
1921			 * beforehand, implicitly indicating the need for DAD.
1922			 * We may be able to skip the random delay in this
1923			 * case, but we impose delays just in case.
1924			 */
1925			nd6_dad_start(ifa,
1926			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1927		}
1928	}
1929	IF_ADDR_RUNLOCK(ifp);
1930
1931	/*
1932	 * special cases, like 6to4, are handled in in6_ifattach
1933	 */
1934	in6_ifattach(ifp, NULL);
1935}
1936
1937int
1938in6if_do_dad(struct ifnet *ifp)
1939{
1940	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1941		return (0);
1942
1943	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1944	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1945		return (0);
1946
1947	/*
1948	 * Our DAD routine requires the interface up and running.
1949	 * However, some interfaces can be up before the RUNNING
1950	 * status.  Additionaly, users may try to assign addresses
1951	 * before the interface becomes up (or running).
1952	 * We simply skip DAD in such a case as a work around.
1953	 * XXX: we should rather mark "tentative" on such addresses,
1954	 * and do DAD after the interface becomes ready.
1955	 */
1956	if (!((ifp->if_flags & IFF_UP) &&
1957	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1958		return (0);
1959
1960	return (1);
1961}
1962
1963/*
1964 * Calculate max IPv6 MTU through all the interfaces and store it
1965 * to in6_maxmtu.
1966 */
1967void
1968in6_setmaxmtu(void)
1969{
1970	unsigned long maxmtu = 0;
1971	struct ifnet *ifp;
1972
1973	IFNET_RLOCK_NOSLEEP();
1974	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1975		/* this function can be called during ifnet initialization */
1976		if (!ifp->if_afdata[AF_INET6])
1977			continue;
1978		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1979		    IN6_LINKMTU(ifp) > maxmtu)
1980			maxmtu = IN6_LINKMTU(ifp);
1981	}
1982	IFNET_RUNLOCK_NOSLEEP();
1983	if (maxmtu)	/* update only when maxmtu is positive */
1984		V_in6_maxmtu = maxmtu;
1985}
1986
1987/*
1988 * Provide the length of interface identifiers to be used for the link attached
1989 * to the given interface.  The length should be defined in "IPv6 over
1990 * xxx-link" document.  Note that address architecture might also define
1991 * the length for a particular set of address prefixes, regardless of the
1992 * link type.  As clarified in rfc2462bis, those two definitions should be
1993 * consistent, and those really are as of August 2004.
1994 */
1995int
1996in6_if2idlen(struct ifnet *ifp)
1997{
1998	switch (ifp->if_type) {
1999	case IFT_ETHER:		/* RFC2464 */
2000	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2001	case IFT_L2VLAN:	/* ditto */
2002	case IFT_IEEE80211:	/* ditto */
2003	case IFT_INFINIBAND:
2004		return (64);
2005	case IFT_FDDI:		/* RFC2467 */
2006		return (64);
2007	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2008		return (64);
2009	case IFT_PPP:		/* RFC2472 */
2010		return (64);
2011	case IFT_ARCNET:	/* RFC2497 */
2012		return (64);
2013	case IFT_FRELAY:	/* RFC2590 */
2014		return (64);
2015	case IFT_IEEE1394:	/* RFC3146 */
2016		return (64);
2017	case IFT_GIF:
2018		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2019	case IFT_LOOP:
2020		return (64);	/* XXX: is this really correct? */
2021	default:
2022		/*
2023		 * Unknown link type:
2024		 * It might be controversial to use the today's common constant
2025		 * of 64 for these cases unconditionally.  For full compliance,
2026		 * we should return an error in this case.  On the other hand,
2027		 * if we simply miss the standard for the link type or a new
2028		 * standard is defined for a new link type, the IFID length
2029		 * is very likely to be the common constant.  As a compromise,
2030		 * we always use the constant, but make an explicit notice
2031		 * indicating the "unknown" case.
2032		 */
2033		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2034		return (64);
2035	}
2036}
2037
2038#include <sys/sysctl.h>
2039
2040struct in6_llentry {
2041	struct llentry		base;
2042	struct sockaddr_in6	l3_addr6;
2043};
2044
2045/*
2046 * Deletes an address from the address table.
2047 * This function is called by the timer functions
2048 * such as arptimer() and nd6_llinfo_timer(), and
2049 * the caller does the locking.
2050 */
2051static void
2052in6_lltable_free(struct lltable *llt, struct llentry *lle)
2053{
2054	LLE_WUNLOCK(lle);
2055	LLE_LOCK_DESTROY(lle);
2056	free(lle, M_LLTABLE);
2057}
2058
2059static struct llentry *
2060in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2061{
2062	struct in6_llentry *lle;
2063
2064	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2065	if (lle == NULL)		/* NB: caller generates msg */
2066		return NULL;
2067
2068	lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2069	lle->base.lle_refcnt = 1;
2070	lle->base.lle_free = in6_lltable_free;
2071	LLE_LOCK_INIT(&lle->base);
2072	callout_init(&lle->base.ln_timer_ch, 1);
2073
2074	return (&lle->base);
2075}
2076
2077static void
2078in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2079    const struct sockaddr *mask, u_int flags)
2080{
2081	const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2082	const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2083	struct llentry *lle, *next;
2084	int i;
2085
2086	/*
2087	 * (flags & LLE_STATIC) means deleting all entries
2088	 * including static ND6 entries.
2089	 */
2090	IF_AFDATA_WLOCK(llt->llt_ifp);
2091	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2092		LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2093			if (IN6_ARE_MASKED_ADDR_EQUAL(
2094			    &satosin6(L3_ADDR(lle))->sin6_addr,
2095			    &pfx->sin6_addr, &msk->sin6_addr) &&
2096			    ((flags & LLE_STATIC) ||
2097			    !(lle->la_flags & LLE_STATIC))) {
2098				LLE_WLOCK(lle);
2099				if (callout_stop(&lle->la_timer))
2100					LLE_REMREF(lle);
2101				llentry_free(lle);
2102			}
2103		}
2104	}
2105	IF_AFDATA_WUNLOCK(llt->llt_ifp);
2106}
2107
2108static int
2109in6_lltable_rtcheck(struct ifnet *ifp,
2110		    u_int flags,
2111		    const struct sockaddr *l3addr)
2112{
2113	struct rtentry *rt;
2114	char ip6buf[INET6_ADDRSTRLEN];
2115
2116	KASSERT(l3addr->sa_family == AF_INET6,
2117	    ("sin_family %d", l3addr->sa_family));
2118
2119	/* Our local addresses are always only installed on the default FIB. */
2120	/* XXX rtalloc1 should take a const param */
2121	rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2122	    RT_DEFAULT_FIB);
2123	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2124		struct ifaddr *ifa;
2125		/*
2126		 * Create an ND6 cache for an IPv6 neighbor
2127		 * that is not covered by our own prefix.
2128		 */
2129		/* XXX ifaof_ifpforaddr should take a const param */
2130		ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2131		if (ifa != NULL) {
2132			ifa_free(ifa);
2133			if (rt != NULL)
2134				RTFREE_LOCKED(rt);
2135			return 0;
2136		}
2137		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2138		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2139		if (rt != NULL)
2140			RTFREE_LOCKED(rt);
2141		return EINVAL;
2142	}
2143	RTFREE_LOCKED(rt);
2144	return 0;
2145}
2146
2147static struct llentry *
2148in6_lltable_lookup(struct lltable *llt, u_int flags,
2149	const struct sockaddr *l3addr)
2150{
2151	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2152	struct ifnet *ifp = llt->llt_ifp;
2153	struct llentry *lle;
2154	struct llentries *lleh;
2155	u_int hashkey;
2156
2157	IF_AFDATA_LOCK_ASSERT(ifp);
2158	KASSERT(l3addr->sa_family == AF_INET6,
2159	    ("sin_family %d", l3addr->sa_family));
2160
2161	hashkey = sin6->sin6_addr.s6_addr32[3];
2162	lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2163	LIST_FOREACH(lle, lleh, lle_next) {
2164		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2165		if (lle->la_flags & LLE_DELETED)
2166			continue;
2167		if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2168		    sizeof(struct in6_addr)) == 0)
2169			break;
2170	}
2171
2172	if (lle == NULL) {
2173		if (!(flags & LLE_CREATE))
2174			return (NULL);
2175		IF_AFDATA_WLOCK_ASSERT(ifp);
2176		/*
2177		 * A route that covers the given address must have
2178		 * been installed 1st because we are doing a resolution,
2179		 * verify this.
2180		 */
2181		if (!(flags & LLE_IFADDR) &&
2182		    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2183			return NULL;
2184
2185		lle = in6_lltable_new(l3addr, flags);
2186		if (lle == NULL) {
2187			log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2188			return NULL;
2189		}
2190		lle->la_flags = flags & ~LLE_CREATE;
2191		if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2192			bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2193			lle->la_flags |= (LLE_VALID | LLE_STATIC);
2194		}
2195
2196		lle->lle_tbl  = llt;
2197		lle->lle_head = lleh;
2198		lle->la_flags |= LLE_LINKED;
2199		LIST_INSERT_HEAD(lleh, lle, lle_next);
2200	} else if (flags & LLE_DELETE) {
2201		if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2202			LLE_WLOCK(lle);
2203			lle->la_flags |= LLE_DELETED;
2204#ifdef DIAGNOSTIC
2205			log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2206#endif
2207			if ((lle->la_flags &
2208			    (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC)
2209				llentry_free(lle);
2210			else
2211				LLE_WUNLOCK(lle);
2212		}
2213		lle = (void *)-1;
2214	}
2215	if (LLE_IS_VALID(lle)) {
2216		if (flags & LLE_EXCLUSIVE)
2217			LLE_WLOCK(lle);
2218		else
2219			LLE_RLOCK(lle);
2220	}
2221	return (lle);
2222}
2223
2224static int
2225in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2226{
2227	struct ifnet *ifp = llt->llt_ifp;
2228	struct llentry *lle;
2229	/* XXX stack use */
2230	struct {
2231		struct rt_msghdr	rtm;
2232		struct sockaddr_in6	sin6;
2233		/*
2234		 * ndp.c assumes that sdl is word aligned
2235		 */
2236#ifdef __LP64__
2237		uint32_t		pad;
2238#endif
2239		struct sockaddr_dl	sdl;
2240	} ndpc;
2241	int i, error;
2242
2243	if (ifp->if_flags & IFF_LOOPBACK)
2244		return 0;
2245
2246	LLTABLE_LOCK_ASSERT();
2247
2248	error = 0;
2249	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2250		LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2251			struct sockaddr_dl *sdl;
2252
2253			/* skip deleted or invalid entries */
2254			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2255				continue;
2256			/* Skip if jailed and not a valid IP of the prison. */
2257			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2258				continue;
2259			/*
2260			 * produce a msg made of:
2261			 *  struct rt_msghdr;
2262			 *  struct sockaddr_in6 (IPv6)
2263			 *  struct sockaddr_dl;
2264			 */
2265			bzero(&ndpc, sizeof(ndpc));
2266			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2267			ndpc.rtm.rtm_version = RTM_VERSION;
2268			ndpc.rtm.rtm_type = RTM_GET;
2269			ndpc.rtm.rtm_flags = RTF_UP;
2270			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2271			ndpc.sin6.sin6_family = AF_INET6;
2272			ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2273			bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2274			if (V_deembed_scopeid)
2275				sa6_recoverscope(&ndpc.sin6);
2276
2277			/* publish */
2278			if (lle->la_flags & LLE_PUB)
2279				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2280
2281			sdl = &ndpc.sdl;
2282			sdl->sdl_family = AF_LINK;
2283			sdl->sdl_len = sizeof(*sdl);
2284			sdl->sdl_alen = ifp->if_addrlen;
2285			sdl->sdl_index = ifp->if_index;
2286			sdl->sdl_type = ifp->if_type;
2287			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2288			ndpc.rtm.rtm_rmx.rmx_expire =
2289			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2290			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2291			if (lle->la_flags & LLE_STATIC)
2292				ndpc.rtm.rtm_flags |= RTF_STATIC;
2293			ndpc.rtm.rtm_index = ifp->if_index;
2294			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2295			if (error)
2296				break;
2297		}
2298	}
2299	return error;
2300}
2301
2302void *
2303in6_domifattach(struct ifnet *ifp)
2304{
2305	struct in6_ifextra *ext;
2306
2307	/* There are not IPv6-capable interfaces. */
2308	switch (ifp->if_type) {
2309	case IFT_PFLOG:
2310	case IFT_PFSYNC:
2311	case IFT_USB:
2312		return (NULL);
2313	}
2314	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2315	bzero(ext, sizeof(*ext));
2316
2317	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2318	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2319	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2320	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2321
2322	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2323	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2324	    M_WAITOK);
2325	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2326	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2327
2328	ext->nd_ifinfo = nd6_ifattach(ifp);
2329	ext->scope6_id = scope6_ifattach(ifp);
2330	ext->lltable = lltable_init(ifp, AF_INET6);
2331	if (ext->lltable != NULL) {
2332		ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2333		ext->lltable->llt_lookup = in6_lltable_lookup;
2334		ext->lltable->llt_dump = in6_lltable_dump;
2335	}
2336
2337	ext->mld_ifinfo = mld_domifattach(ifp);
2338
2339	return ext;
2340}
2341
2342int
2343in6_domifmtu(struct ifnet *ifp)
2344{
2345
2346	return (IN6_LINKMTU(ifp));
2347}
2348
2349void
2350in6_domifdetach(struct ifnet *ifp, void *aux)
2351{
2352	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2353
2354	mld_domifdetach(ifp);
2355	scope6_ifdetach(ext->scope6_id);
2356	nd6_ifdetach(ext->nd_ifinfo);
2357	lltable_free(ext->lltable);
2358	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2359	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2360	free(ext->in6_ifstat, M_IFADDR);
2361	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2362	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2363	free(ext->icmp6_ifstat, M_IFADDR);
2364	free(ext, M_IFADDR);
2365}
2366
2367/*
2368 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2369 * v4 mapped addr or v4 compat addr
2370 */
2371void
2372in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2373{
2374
2375	bzero(sin, sizeof(*sin));
2376	sin->sin_len = sizeof(struct sockaddr_in);
2377	sin->sin_family = AF_INET;
2378	sin->sin_port = sin6->sin6_port;
2379	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2380}
2381
2382/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2383void
2384in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2385{
2386	bzero(sin6, sizeof(*sin6));
2387	sin6->sin6_len = sizeof(struct sockaddr_in6);
2388	sin6->sin6_family = AF_INET6;
2389	sin6->sin6_port = sin->sin_port;
2390	sin6->sin6_addr.s6_addr32[0] = 0;
2391	sin6->sin6_addr.s6_addr32[1] = 0;
2392	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2393	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2394}
2395
2396/* Convert sockaddr_in6 into sockaddr_in. */
2397void
2398in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2399{
2400	struct sockaddr_in *sin_p;
2401	struct sockaddr_in6 sin6;
2402
2403	/*
2404	 * Save original sockaddr_in6 addr and convert it
2405	 * to sockaddr_in.
2406	 */
2407	sin6 = *(struct sockaddr_in6 *)nam;
2408	sin_p = (struct sockaddr_in *)nam;
2409	in6_sin6_2_sin(sin_p, &sin6);
2410}
2411
2412/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2413void
2414in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2415{
2416	struct sockaddr_in *sin_p;
2417	struct sockaddr_in6 *sin6_p;
2418
2419	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2420	sin_p = (struct sockaddr_in *)*nam;
2421	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2422	free(*nam, M_SONAME);
2423	*nam = (struct sockaddr *)sin6_p;
2424}
2425