in6.c revision 34a9a386cb4df8844bca8e43dae20e4a15710fcc
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/errno.h>
72#include <sys/jail.h>
73#include <sys/malloc.h>
74#include <sys/socket.h>
75#include <sys/socketvar.h>
76#include <sys/sockio.h>
77#include <sys/systm.h>
78#include <sys/priv.h>
79#include <sys/proc.h>
80#include <sys/time.h>
81#include <sys/kernel.h>
82#include <sys/syslog.h>
83
84#include <net/if.h>
85#include <net/if_var.h>
86#include <net/if_types.h>
87#include <net/route.h>
88#include <net/if_dl.h>
89#include <net/vnet.h>
90
91#include <netinet/in.h>
92#include <netinet/in_var.h>
93#include <net/if_llatbl.h>
94#include <netinet/if_ether.h>
95#include <netinet/in_systm.h>
96#include <netinet/ip.h>
97#include <netinet/in_pcb.h>
98#include <netinet/ip_carp.h>
99
100#include <netinet/ip6.h>
101#include <netinet6/ip6_var.h>
102#include <netinet6/nd6.h>
103#include <netinet6/mld6_var.h>
104#include <netinet6/ip6_mroute.h>
105#include <netinet6/in6_ifattach.h>
106#include <netinet6/scope6_var.h>
107#include <netinet6/in6_pcb.h>
108
109/*
110 * Definitions of some costant IP6 addresses.
111 */
112const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
113const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
114const struct in6_addr in6addr_nodelocal_allnodes =
115	IN6ADDR_NODELOCAL_ALLNODES_INIT;
116const struct in6_addr in6addr_linklocal_allnodes =
117	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
118const struct in6_addr in6addr_linklocal_allrouters =
119	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
120const struct in6_addr in6addr_linklocal_allv2routers =
121	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
122
123const struct in6_addr in6mask0 = IN6MASK0;
124const struct in6_addr in6mask32 = IN6MASK32;
125const struct in6_addr in6mask64 = IN6MASK64;
126const struct in6_addr in6mask96 = IN6MASK96;
127const struct in6_addr in6mask128 = IN6MASK128;
128
129const struct sockaddr_in6 sa6_any =
130	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
131
132static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
133	struct ifnet *, struct thread *));
134static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *,
135	struct sockaddr_in6 *, int));
136static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
137
138int	(*faithprefix_p)(struct in6_addr *);
139
140#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
141#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
142
143void
144in6_ifaddloop(struct ifaddr *ifa)
145{
146	struct sockaddr_dl gateway;
147	struct sockaddr_in6 mask, addr;
148	struct rtentry rt;
149	struct in6_ifaddr *ia;
150	struct ifnet *ifp;
151	struct llentry *ln;
152
153	ia = ifa2ia6(ifa);
154	ifp = ifa->ifa_ifp;
155	IF_AFDATA_LOCK(ifp);
156	ifa->ifa_rtrequest = nd6_rtrequest;
157	ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR |
158	    LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr);
159	IF_AFDATA_UNLOCK(ifp);
160	if (ln != NULL) {
161		ln->la_expire = 0;  /* for IPv6 this means permanent */
162		ln->ln_state = ND6_LLINFO_REACHABLE;
163		/*
164		 * initialize for rtmsg generation
165		 */
166		bzero(&gateway, sizeof(gateway));
167		gateway.sdl_len = sizeof(gateway);
168		gateway.sdl_family = AF_LINK;
169		gateway.sdl_nlen = 0;
170		gateway.sdl_alen = 6;
171		memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned,
172		    sizeof(ln->ll_addr));
173		LLE_WUNLOCK(ln);
174	}
175
176	bzero(&rt, sizeof(rt));
177	rt.rt_gateway = (struct sockaddr *)&gateway;
178	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
179	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
180	rt_mask(&rt) = (struct sockaddr *)&mask;
181	rt_key(&rt) = (struct sockaddr *)&addr;
182	rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC;
183	/* Announce arrival of local address to all FIBs. */
184	rt_newaddrmsg(RTM_ADD, ifa, 0, &rt);
185}
186
187void
188in6_ifremloop(struct ifaddr *ifa)
189{
190	struct sockaddr_dl gateway;
191	struct sockaddr_in6 mask, addr;
192	struct rtentry rt0;
193	struct in6_ifaddr *ia;
194	struct ifnet *ifp;
195
196	ia = ifa2ia6(ifa);
197	ifp = ifa->ifa_ifp;
198	IF_AFDATA_LOCK(ifp);
199	lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR),
200	    (struct sockaddr *)&ia->ia_addr);
201	IF_AFDATA_UNLOCK(ifp);
202
203	/*
204	 * initialize for rtmsg generation
205	 */
206	bzero(&gateway, sizeof(gateway));
207	gateway.sdl_len = sizeof(gateway);
208	gateway.sdl_family = AF_LINK;
209	gateway.sdl_nlen = 0;
210	gateway.sdl_alen = ifp->if_addrlen;
211	bzero(&rt0, sizeof(rt0));
212	rt0.rt_gateway = (struct sockaddr *)&gateway;
213	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
214	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
215	rt_mask(&rt0) = (struct sockaddr *)&mask;
216	rt_key(&rt0) = (struct sockaddr *)&addr;
217	rt0.rt_flags = RTF_HOST | RTF_STATIC;
218	/* Announce removal of local address to all FIBs. */
219	rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0);
220}
221
222int
223in6_mask2len(struct in6_addr *mask, u_char *lim0)
224{
225	int x = 0, y;
226	u_char *lim = lim0, *p;
227
228	/* ignore the scope_id part */
229	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
230		lim = (u_char *)mask + sizeof(*mask);
231	for (p = (u_char *)mask; p < lim; x++, p++) {
232		if (*p != 0xff)
233			break;
234	}
235	y = 0;
236	if (p < lim) {
237		for (y = 0; y < 8; y++) {
238			if ((*p & (0x80 >> y)) == 0)
239				break;
240		}
241	}
242
243	/*
244	 * when the limit pointer is given, do a stricter check on the
245	 * remaining bits.
246	 */
247	if (p < lim) {
248		if (y != 0 && (*p & (0x00ff >> y)) != 0)
249			return (-1);
250		for (p = p + 1; p < lim; p++)
251			if (*p != 0)
252				return (-1);
253	}
254
255	return x * 8 + y;
256}
257
258#ifdef COMPAT_FREEBSD32
259struct in6_ndifreq32 {
260	char ifname[IFNAMSIZ];
261	uint32_t ifindex;
262};
263#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
264#endif
265
266int
267in6_control(struct socket *so, u_long cmd, caddr_t data,
268    struct ifnet *ifp, struct thread *td)
269{
270	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
271	struct	in6_ifaddr *ia = NULL;
272	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
273	struct sockaddr_in6 *sa6;
274	int carp_attached = 0;
275	int error;
276	u_long ocmd = cmd;
277
278	/*
279	 * Compat to make pre-10.x ifconfig(8) operable.
280	 */
281	if (cmd == OSIOCAIFADDR_IN6)
282		cmd = SIOCAIFADDR_IN6;
283
284	switch (cmd) {
285	case SIOCGETSGCNT_IN6:
286	case SIOCGETMIFCNT_IN6:
287		/*
288		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
289		 * We cannot see how that would be needed, so do not adjust the
290		 * KPI blindly; more likely should clean up the IPv4 variant.
291		 */
292		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
293	}
294
295	switch(cmd) {
296	case SIOCAADDRCTL_POLICY:
297	case SIOCDADDRCTL_POLICY:
298		if (td != NULL) {
299			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
300			if (error)
301				return (error);
302		}
303		return (in6_src_ioctl(cmd, data));
304	}
305
306	if (ifp == NULL)
307		return (EOPNOTSUPP);
308
309	switch (cmd) {
310	case SIOCSNDFLUSH_IN6:
311	case SIOCSPFXFLUSH_IN6:
312	case SIOCSRTRFLUSH_IN6:
313	case SIOCSDEFIFACE_IN6:
314	case SIOCSIFINFO_FLAGS:
315	case SIOCSIFINFO_IN6:
316		if (td != NULL) {
317			error = priv_check(td, PRIV_NETINET_ND6);
318			if (error)
319				return (error);
320		}
321		/* FALLTHROUGH */
322	case OSIOCGIFINFO_IN6:
323	case SIOCGIFINFO_IN6:
324	case SIOCGDRLST_IN6:
325	case SIOCGPRLST_IN6:
326	case SIOCGNBRINFO_IN6:
327	case SIOCGDEFIFACE_IN6:
328		return (nd6_ioctl(cmd, data, ifp));
329
330#ifdef COMPAT_FREEBSD32
331	case SIOCGDEFIFACE32_IN6:
332		{
333			struct in6_ndifreq ndif;
334			struct in6_ndifreq32 *ndif32;
335
336			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
337			    ifp);
338			if (error)
339				return (error);
340			ndif32 = (struct in6_ndifreq32 *)data;
341			ndif32->ifindex = ndif.ifindex;
342			return (0);
343		}
344#endif
345	}
346
347	switch (cmd) {
348	case SIOCSIFPREFIX_IN6:
349	case SIOCDIFPREFIX_IN6:
350	case SIOCAIFPREFIX_IN6:
351	case SIOCCIFPREFIX_IN6:
352	case SIOCSGIFPREFIX_IN6:
353	case SIOCGIFPREFIX_IN6:
354		log(LOG_NOTICE,
355		    "prefix ioctls are now invalidated. "
356		    "please use ifconfig.\n");
357		return (EOPNOTSUPP);
358	}
359
360	switch (cmd) {
361	case SIOCSSCOPE6:
362		if (td != NULL) {
363			error = priv_check(td, PRIV_NETINET_SCOPE6);
364			if (error)
365				return (error);
366		}
367		return (scope6_set(ifp,
368		    (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
369	case SIOCGSCOPE6:
370		return (scope6_get(ifp,
371		    (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
372	case SIOCGSCOPE6DEF:
373		return (scope6_get_default((struct scope6_id *)
374		    ifr->ifr_ifru.ifru_scope_id));
375	}
376
377	switch (cmd) {
378	case SIOCALIFADDR:
379		if (td != NULL) {
380			error = priv_check(td, PRIV_NET_ADDIFADDR);
381			if (error)
382				return (error);
383		}
384		return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
385
386	case SIOCDLIFADDR:
387		if (td != NULL) {
388			error = priv_check(td, PRIV_NET_DELIFADDR);
389			if (error)
390				return (error);
391		}
392		/* FALLTHROUGH */
393	case SIOCGLIFADDR:
394		return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
395	}
396
397	/*
398	 * Find address for this interface, if it exists.
399	 *
400	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
401	 * only, and used the first interface address as the target of other
402	 * operations (without checking ifra_addr).  This was because netinet
403	 * code/API assumed at most 1 interface address per interface.
404	 * Since IPv6 allows a node to assign multiple addresses
405	 * on a single interface, we almost always look and check the
406	 * presence of ifra_addr, and reject invalid ones here.
407	 * It also decreases duplicated code among SIOC*_IN6 operations.
408	 */
409	switch (cmd) {
410	case SIOCAIFADDR_IN6:
411	case SIOCSIFPHYADDR_IN6:
412		sa6 = &ifra->ifra_addr;
413		break;
414	case SIOCSIFADDR_IN6:
415	case SIOCGIFADDR_IN6:
416	case SIOCSIFDSTADDR_IN6:
417	case SIOCSIFNETMASK_IN6:
418	case SIOCGIFDSTADDR_IN6:
419	case SIOCGIFNETMASK_IN6:
420	case SIOCDIFADDR_IN6:
421	case SIOCGIFPSRCADDR_IN6:
422	case SIOCGIFPDSTADDR_IN6:
423	case SIOCGIFAFLAG_IN6:
424	case SIOCSNDFLUSH_IN6:
425	case SIOCSPFXFLUSH_IN6:
426	case SIOCSRTRFLUSH_IN6:
427	case SIOCGIFALIFETIME_IN6:
428	case SIOCSIFALIFETIME_IN6:
429	case SIOCGIFSTAT_IN6:
430	case SIOCGIFSTAT_ICMP6:
431		sa6 = &ifr->ifr_addr;
432		break;
433	default:
434		sa6 = NULL;
435		break;
436	}
437	if (sa6 && sa6->sin6_family == AF_INET6) {
438		if (sa6->sin6_scope_id != 0)
439			error = sa6_embedscope(sa6, 0);
440		else
441			error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
442		if (error != 0)
443			return (error);
444		if (td != NULL && (error = prison_check_ip6(td->td_ucred,
445		    &sa6->sin6_addr)) != 0)
446			return (error);
447		ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
448	} else
449		ia = NULL;
450
451	switch (cmd) {
452	case SIOCSIFADDR_IN6:
453	case SIOCSIFDSTADDR_IN6:
454	case SIOCSIFNETMASK_IN6:
455		/*
456		 * Since IPv6 allows a node to assign multiple addresses
457		 * on a single interface, SIOCSIFxxx ioctls are deprecated.
458		 */
459		/* we decided to obsolete this command (20000704) */
460		error = EINVAL;
461		goto out;
462
463	case SIOCDIFADDR_IN6:
464		/*
465		 * for IPv4, we look for existing in_ifaddr here to allow
466		 * "ifconfig if0 delete" to remove the first IPv4 address on
467		 * the interface.  For IPv6, as the spec allows multiple
468		 * interface address from the day one, we consider "remove the
469		 * first one" semantics to be not preferable.
470		 */
471		if (ia == NULL) {
472			error = EADDRNOTAVAIL;
473			goto out;
474		}
475		/* FALLTHROUGH */
476	case SIOCAIFADDR_IN6:
477		/*
478		 * We always require users to specify a valid IPv6 address for
479		 * the corresponding operation.
480		 */
481		if (ifra->ifra_addr.sin6_family != AF_INET6 ||
482		    ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
483			error = EAFNOSUPPORT;
484			goto out;
485		}
486
487		if (td != NULL) {
488			error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ?
489			    PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
490			if (error)
491				goto out;
492		}
493		break;
494
495	case SIOCGIFADDR_IN6:
496		/* This interface is basically deprecated. use SIOCGIFCONF. */
497		/* FALLTHROUGH */
498	case SIOCGIFAFLAG_IN6:
499	case SIOCGIFNETMASK_IN6:
500	case SIOCGIFDSTADDR_IN6:
501	case SIOCGIFALIFETIME_IN6:
502		/* must think again about its semantics */
503		if (ia == NULL) {
504			error = EADDRNOTAVAIL;
505			goto out;
506		}
507		break;
508
509	case SIOCSIFALIFETIME_IN6:
510	    {
511		struct in6_addrlifetime *lt;
512
513		if (td != NULL) {
514			error = priv_check(td, PRIV_NETINET_ALIFETIME6);
515			if (error)
516				goto out;
517		}
518		if (ia == NULL) {
519			error = EADDRNOTAVAIL;
520			goto out;
521		}
522		/* sanity for overflow - beware unsigned */
523		lt = &ifr->ifr_ifru.ifru_lifetime;
524		if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
525		    lt->ia6t_vltime + time_second < time_second) {
526			error = EINVAL;
527			goto out;
528		}
529		if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
530		    lt->ia6t_pltime + time_second < time_second) {
531			error = EINVAL;
532			goto out;
533		}
534		break;
535	    }
536	}
537
538	switch (cmd) {
539	case SIOCGIFADDR_IN6:
540		ifr->ifr_addr = ia->ia_addr;
541		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
542			goto out;
543		break;
544
545	case SIOCGIFDSTADDR_IN6:
546		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
547			error = EINVAL;
548			goto out;
549		}
550		/*
551		 * XXX: should we check if ifa_dstaddr is NULL and return
552		 * an error?
553		 */
554		ifr->ifr_dstaddr = ia->ia_dstaddr;
555		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
556			goto out;
557		break;
558
559	case SIOCGIFNETMASK_IN6:
560		ifr->ifr_addr = ia->ia_prefixmask;
561		break;
562
563	case SIOCGIFAFLAG_IN6:
564		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
565		break;
566
567	case SIOCGIFSTAT_IN6:
568		if (ifp == NULL) {
569			error = EINVAL;
570			goto out;
571		}
572		bzero(&ifr->ifr_ifru.ifru_stat,
573		    sizeof(ifr->ifr_ifru.ifru_stat));
574		ifr->ifr_ifru.ifru_stat =
575		    *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat;
576		break;
577
578	case SIOCGIFSTAT_ICMP6:
579		if (ifp == NULL) {
580			error = EINVAL;
581			goto out;
582		}
583		bzero(&ifr->ifr_ifru.ifru_icmp6stat,
584		    sizeof(ifr->ifr_ifru.ifru_icmp6stat));
585		ifr->ifr_ifru.ifru_icmp6stat =
586		    *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat;
587		break;
588
589	case SIOCGIFALIFETIME_IN6:
590		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
591		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
592			time_t maxexpire;
593			struct in6_addrlifetime *retlt =
594			    &ifr->ifr_ifru.ifru_lifetime;
595
596			/*
597			 * XXX: adjust expiration time assuming time_t is
598			 * signed.
599			 */
600			maxexpire = (-1) &
601			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
602			if (ia->ia6_lifetime.ia6t_vltime <
603			    maxexpire - ia->ia6_updatetime) {
604				retlt->ia6t_expire = ia->ia6_updatetime +
605				    ia->ia6_lifetime.ia6t_vltime;
606			} else
607				retlt->ia6t_expire = maxexpire;
608		}
609		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
610			time_t maxexpire;
611			struct in6_addrlifetime *retlt =
612			    &ifr->ifr_ifru.ifru_lifetime;
613
614			/*
615			 * XXX: adjust expiration time assuming time_t is
616			 * signed.
617			 */
618			maxexpire = (-1) &
619			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
620			if (ia->ia6_lifetime.ia6t_pltime <
621			    maxexpire - ia->ia6_updatetime) {
622				retlt->ia6t_preferred = ia->ia6_updatetime +
623				    ia->ia6_lifetime.ia6t_pltime;
624			} else
625				retlt->ia6t_preferred = maxexpire;
626		}
627		break;
628
629	case SIOCSIFALIFETIME_IN6:
630		ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
631		/* for sanity */
632		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
633			ia->ia6_lifetime.ia6t_expire =
634				time_second + ia->ia6_lifetime.ia6t_vltime;
635		} else
636			ia->ia6_lifetime.ia6t_expire = 0;
637		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
638			ia->ia6_lifetime.ia6t_preferred =
639				time_second + ia->ia6_lifetime.ia6t_pltime;
640		} else
641			ia->ia6_lifetime.ia6t_preferred = 0;
642		break;
643
644	case SIOCAIFADDR_IN6:
645	{
646		int i;
647		struct nd_prefixctl pr0;
648		struct nd_prefix *pr;
649
650		/*
651		 * first, make or update the interface address structure,
652		 * and link it to the list.
653		 */
654		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
655			goto out;
656		if (ia != NULL)
657			ifa_free(&ia->ia_ifa);
658		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
659		    == NULL) {
660			/*
661			 * this can happen when the user specify the 0 valid
662			 * lifetime.
663			 */
664			break;
665		}
666
667		if (cmd == ocmd && ifra->ifra_vhid > 0) {
668			if (carp_attach_p != NULL)
669				error = (*carp_attach_p)(&ia->ia_ifa,
670				    ifra->ifra_vhid);
671			else
672				error = EPROTONOSUPPORT;
673			if (error)
674				goto out;
675			else
676				carp_attached = 1;
677		}
678
679		/*
680		 * then, make the prefix on-link on the interface.
681		 * XXX: we'd rather create the prefix before the address, but
682		 * we need at least one address to install the corresponding
683		 * interface route, so we configure the address first.
684		 */
685
686		/*
687		 * convert mask to prefix length (prefixmask has already
688		 * been validated in in6_update_ifa().
689		 */
690		bzero(&pr0, sizeof(pr0));
691		pr0.ndpr_ifp = ifp;
692		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
693		    NULL);
694		if (pr0.ndpr_plen == 128) {
695			break;	/* we don't need to install a host route. */
696		}
697		pr0.ndpr_prefix = ifra->ifra_addr;
698		/* apply the mask for safety. */
699		for (i = 0; i < 4; i++) {
700			pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
701			    ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
702		}
703		/*
704		 * XXX: since we don't have an API to set prefix (not address)
705		 * lifetimes, we just use the same lifetimes as addresses.
706		 * The (temporarily) installed lifetimes can be overridden by
707		 * later advertised RAs (when accept_rtadv is non 0), which is
708		 * an intended behavior.
709		 */
710		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
711		pr0.ndpr_raf_auto =
712		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
713		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
714		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
715
716		/* add the prefix if not yet. */
717		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
718			/*
719			 * nd6_prelist_add will install the corresponding
720			 * interface route.
721			 */
722			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
723				if (carp_attached)
724					(*carp_detach_p)(&ia->ia_ifa);
725				goto out;
726			}
727			if (pr == NULL) {
728				if (carp_attached)
729					(*carp_detach_p)(&ia->ia_ifa);
730				log(LOG_ERR, "nd6_prelist_add succeeded but "
731				    "no prefix\n");
732				error = EINVAL;
733				goto out;
734			}
735		}
736
737		/* relate the address to the prefix */
738		if (ia->ia6_ndpr == NULL) {
739			ia->ia6_ndpr = pr;
740			pr->ndpr_refcnt++;
741
742			/*
743			 * If this is the first autoconf address from the
744			 * prefix, create a temporary address as well
745			 * (when required).
746			 */
747			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
748			    V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
749				int e;
750				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
751					log(LOG_NOTICE, "in6_control: failed "
752					    "to create a temporary address, "
753					    "errno=%d\n", e);
754				}
755			}
756		}
757
758		/*
759		 * this might affect the status of autoconfigured addresses,
760		 * that is, this address might make other addresses detached.
761		 */
762		pfxlist_onlink_check();
763		if (error == 0 && ia) {
764			if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
765				/*
766				 * Try to clear the flag when a new
767				 * IPv6 address is added onto an
768				 * IFDISABLED interface and it
769				 * succeeds.
770				 */
771				struct in6_ndireq nd;
772
773				memset(&nd, 0, sizeof(nd));
774				nd.ndi.flags = ND_IFINFO(ifp)->flags;
775				nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
776				if (nd6_ioctl(SIOCSIFINFO_FLAGS,
777				    (caddr_t)&nd, ifp) < 0)
778					log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
779					    "SIOCSIFINFO_FLAGS for -ifdisabled "
780					    "failed.");
781				/*
782				 * Ignore failure of clearing the flag
783				 * intentionally.  The failure means
784				 * address duplication was detected.
785				 */
786			}
787			EVENTHANDLER_INVOKE(ifaddr_event, ifp);
788		}
789		break;
790	}
791
792	case SIOCDIFADDR_IN6:
793	{
794		struct nd_prefix *pr;
795
796		/*
797		 * If the address being deleted is the only one that owns
798		 * the corresponding prefix, expire the prefix as well.
799		 * XXX: theoretically, we don't have to worry about such
800		 * relationship, since we separate the address management
801		 * and the prefix management.  We do this, however, to provide
802		 * as much backward compatibility as possible in terms of
803		 * the ioctl operation.
804		 * Note that in6_purgeaddr() will decrement ndpr_refcnt.
805		 */
806		pr = ia->ia6_ndpr;
807		in6_purgeaddr(&ia->ia_ifa);
808		if (pr && pr->ndpr_refcnt == 0)
809			prelist_remove(pr);
810		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
811		break;
812	}
813
814	default:
815		if (ifp == NULL || ifp->if_ioctl == 0) {
816			error = EOPNOTSUPP;
817			goto out;
818		}
819		error = (*ifp->if_ioctl)(ifp, cmd, data);
820		goto out;
821	}
822
823	error = 0;
824out:
825	if (ia != NULL)
826		ifa_free(&ia->ia_ifa);
827	return (error);
828}
829
830
831/*
832 * Join necessary multicast groups.  Factored out from in6_update_ifa().
833 * This entire work should only be done once, for the default FIB.
834 */
835static int
836in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
837    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
838{
839	char ip6buf[INET6_ADDRSTRLEN];
840	struct sockaddr_in6 mltaddr, mltmask;
841	struct in6_addr llsol;
842	struct in6_multi_mship *imm;
843	struct rtentry *rt;
844	int delay, error;
845
846	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
847
848	/* Join solicited multicast addr for new host id. */
849	bzero(&llsol, sizeof(struct in6_addr));
850	llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
851	llsol.s6_addr32[1] = 0;
852	llsol.s6_addr32[2] = htonl(1);
853	llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
854	llsol.s6_addr8[12] = 0xff;
855	if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) {
856		/* XXX: should not happen */
857		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
858		goto cleanup;
859	}
860	delay = 0;
861	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
862		/*
863		 * We need a random delay for DAD on the address being
864		 * configured.  It also means delaying transmission of the
865		 * corresponding MLD report to avoid report collision.
866		 * [RFC 4861, Section 6.3.7]
867		 */
868		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
869	}
870	imm = in6_joingroup(ifp, &llsol, &error, delay);
871	if (imm == NULL) {
872		nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
873		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol),
874		    if_name(ifp), error));
875		goto cleanup;
876	}
877	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
878	*in6m_sol = imm->i6mm_maddr;
879
880	bzero(&mltmask, sizeof(mltmask));
881	mltmask.sin6_len = sizeof(struct sockaddr_in6);
882	mltmask.sin6_family = AF_INET6;
883	mltmask.sin6_addr = in6mask32;
884#define	MLTMASK_LEN  4	/* mltmask's masklen (=32bit=4octet) */
885
886	/*
887	 * Join link-local all-nodes address.
888	 */
889	bzero(&mltaddr, sizeof(mltaddr));
890	mltaddr.sin6_len = sizeof(struct sockaddr_in6);
891	mltaddr.sin6_family = AF_INET6;
892	mltaddr.sin6_addr = in6addr_linklocal_allnodes;
893	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
894		goto cleanup; /* XXX: should not fail */
895
896	/*
897	 * XXX: do we really need this automatic routes?  We should probably
898	 * reconsider this stuff.  Most applications actually do not need the
899	 * routes, since they usually specify the outgoing interface.
900	 */
901	rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
902	if (rt != NULL) {
903		/* XXX: only works in !SCOPEDROUTING case. */
904		if (memcmp(&mltaddr.sin6_addr,
905		    &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
906		    MLTMASK_LEN)) {
907			RTFREE_LOCKED(rt);
908			rt = NULL;
909		}
910	}
911	if (rt == NULL) {
912		error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
913		    (struct sockaddr *)&ia->ia_addr,
914		    (struct sockaddr *)&mltmask, RTF_UP,
915		    (struct rtentry **)0, RT_DEFAULT_FIB);
916		if (error)
917			goto cleanup;
918	} else
919		RTFREE_LOCKED(rt);
920
921	imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
922	if (imm == NULL) {
923		nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
924		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
925		    &mltaddr.sin6_addr), if_name(ifp), error));
926		goto cleanup;
927	}
928	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
929
930	/*
931	 * Join node information group address.
932	 */
933	delay = 0;
934	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
935		/*
936		 * The spec does not say anything about delay for this group,
937		 * but the same logic should apply.
938		 */
939		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
940	}
941	if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) {
942		/* XXX jinmei */
943		imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay);
944		if (imm == NULL)
945			nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
946			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
947			    &mltaddr.sin6_addr), if_name(ifp), error));
948			/* XXX not very fatal, go on... */
949		else
950			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
951	}
952
953	/*
954	 * Join interface-local all-nodes address.
955	 * (ff01::1%ifN, and ff01::%ifN/32)
956	 */
957	mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
958	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
959		goto cleanup; /* XXX: should not fail */
960	/* XXX: again, do we really need the route? */
961	rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
962	if (rt != NULL) {
963		if (memcmp(&mltaddr.sin6_addr,
964		    &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
965		    MLTMASK_LEN)) {
966			RTFREE_LOCKED(rt);
967			rt = NULL;
968		}
969	}
970	if (rt == NULL) {
971		error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr,
972		    (struct sockaddr *)&ia->ia_addr,
973		    (struct sockaddr *)&mltmask, RTF_UP,
974		    (struct rtentry **)0, RT_DEFAULT_FIB);
975		if (error)
976			goto cleanup;
977	} else
978		RTFREE_LOCKED(rt);
979
980	imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0);
981	if (imm == NULL) {
982		nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s "
983		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
984		    &mltaddr.sin6_addr), if_name(ifp), error));
985		goto cleanup;
986	}
987	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
988#undef	MLTMASK_LEN
989
990cleanup:
991	return (error);
992}
993
994/*
995 * Update parameters of an IPv6 interface address.
996 * If necessary, a new entry is created and linked into address chains.
997 * This function is separated from in6_control().
998 */
999int
1000in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1001    struct in6_ifaddr *ia, int flags)
1002{
1003	int error = 0, hostIsNew = 0, plen = -1;
1004	struct sockaddr_in6 dst6;
1005	struct in6_addrlifetime *lt;
1006	struct in6_multi *in6m_sol;
1007	int delay;
1008	char ip6buf[INET6_ADDRSTRLEN];
1009
1010	/* Validate parameters */
1011	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
1012		return (EINVAL);
1013
1014	/*
1015	 * The destination address for a p2p link must have a family
1016	 * of AF_UNSPEC or AF_INET6.
1017	 */
1018	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1019	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
1020	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
1021		return (EAFNOSUPPORT);
1022	/*
1023	 * validate ifra_prefixmask.  don't check sin6_family, netmask
1024	 * does not carry fields other than sin6_len.
1025	 */
1026	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
1027		return (EINVAL);
1028	/*
1029	 * Because the IPv6 address architecture is classless, we require
1030	 * users to specify a (non 0) prefix length (mask) for a new address.
1031	 * We also require the prefix (when specified) mask is valid, and thus
1032	 * reject a non-consecutive mask.
1033	 */
1034	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
1035		return (EINVAL);
1036	if (ifra->ifra_prefixmask.sin6_len != 0) {
1037		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
1038		    (u_char *)&ifra->ifra_prefixmask +
1039		    ifra->ifra_prefixmask.sin6_len);
1040		if (plen <= 0)
1041			return (EINVAL);
1042	} else {
1043		/*
1044		 * In this case, ia must not be NULL.  We just use its prefix
1045		 * length.
1046		 */
1047		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1048	}
1049	/*
1050	 * If the destination address on a p2p interface is specified,
1051	 * and the address is a scoped one, validate/set the scope
1052	 * zone identifier.
1053	 */
1054	dst6 = ifra->ifra_dstaddr;
1055	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
1056	    (dst6.sin6_family == AF_INET6)) {
1057		struct in6_addr in6_tmp;
1058		u_int32_t zoneid;
1059
1060		in6_tmp = dst6.sin6_addr;
1061		if (in6_setscope(&in6_tmp, ifp, &zoneid))
1062			return (EINVAL); /* XXX: should be impossible */
1063
1064		if (dst6.sin6_scope_id != 0) {
1065			if (dst6.sin6_scope_id != zoneid)
1066				return (EINVAL);
1067		} else		/* user omit to specify the ID. */
1068			dst6.sin6_scope_id = zoneid;
1069
1070		/* convert into the internal form */
1071		if (sa6_embedscope(&dst6, 0))
1072			return (EINVAL); /* XXX: should be impossible */
1073	}
1074	/*
1075	 * The destination address can be specified only for a p2p or a
1076	 * loopback interface.  If specified, the corresponding prefix length
1077	 * must be 128.
1078	 */
1079	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
1080		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
1081			/* XXX: noisy message */
1082			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
1083			    "be specified for a p2p or a loopback IF only\n"));
1084			return (EINVAL);
1085		}
1086		if (plen != 128) {
1087			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
1088			    "be 128 when dstaddr is specified\n"));
1089			return (EINVAL);
1090		}
1091	}
1092	/* lifetime consistency check */
1093	lt = &ifra->ifra_lifetime;
1094	if (lt->ia6t_pltime > lt->ia6t_vltime)
1095		return (EINVAL);
1096	if (lt->ia6t_vltime == 0) {
1097		/*
1098		 * the following log might be noisy, but this is a typical
1099		 * configuration mistake or a tool's bug.
1100		 */
1101		nd6log((LOG_INFO,
1102		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1103		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1104
1105		if (ia == NULL)
1106			return (0); /* there's nothing to do */
1107	}
1108
1109	/*
1110	 * If this is a new address, allocate a new ifaddr and link it
1111	 * into chains.
1112	 */
1113	if (ia == NULL) {
1114		hostIsNew = 1;
1115		/*
1116		 * When in6_update_ifa() is called in a process of a received
1117		 * RA, it is called under an interrupt context.  So, we should
1118		 * call malloc with M_NOWAIT.
1119		 */
1120		ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR,
1121		    M_NOWAIT);
1122		if (ia == NULL)
1123			return (ENOBUFS);
1124		bzero((caddr_t)ia, sizeof(*ia));
1125		ifa_init(&ia->ia_ifa);
1126		LIST_INIT(&ia->ia6_memberships);
1127		/* Initialize the address and masks, and put time stamp */
1128		ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1129		ia->ia_addr.sin6_family = AF_INET6;
1130		ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1131		ia->ia6_createtime = time_second;
1132		if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1133			/*
1134			 * XXX: some functions expect that ifa_dstaddr is not
1135			 * NULL for p2p interfaces.
1136			 */
1137			ia->ia_ifa.ifa_dstaddr =
1138			    (struct sockaddr *)&ia->ia_dstaddr;
1139		} else {
1140			ia->ia_ifa.ifa_dstaddr = NULL;
1141		}
1142		ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1143		ia->ia_ifp = ifp;
1144		ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1145		IF_ADDR_WLOCK(ifp);
1146		TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1147		IF_ADDR_WUNLOCK(ifp);
1148
1149		ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1150		IN6_IFADDR_WLOCK();
1151		TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1152		IN6_IFADDR_WUNLOCK();
1153	}
1154
1155	/* update timestamp */
1156	ia->ia6_updatetime = time_second;
1157
1158	/* set prefix mask */
1159	if (ifra->ifra_prefixmask.sin6_len) {
1160		/*
1161		 * We prohibit changing the prefix length of an existing
1162		 * address, because
1163		 * + such an operation should be rare in IPv6, and
1164		 * + the operation would confuse prefix management.
1165		 */
1166		if (ia->ia_prefixmask.sin6_len &&
1167		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1168			nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an"
1169			    " existing (%s) address should not be changed\n",
1170			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1171			error = EINVAL;
1172			goto unlink;
1173		}
1174		ia->ia_prefixmask = ifra->ifra_prefixmask;
1175	}
1176
1177	/*
1178	 * If a new destination address is specified, scrub the old one and
1179	 * install the new destination.  Note that the interface must be
1180	 * p2p or loopback (see the check above.)
1181	 */
1182	if (dst6.sin6_family == AF_INET6 &&
1183	    !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1184		int e;
1185
1186		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1187		    (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) {
1188			nd6log((LOG_ERR, "in6_update_ifa: failed to remove "
1189			    "a route to the old destination: %s\n",
1190			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1191			/* proceed anyway... */
1192		} else
1193			ia->ia_flags &= ~IFA_ROUTE;
1194		ia->ia_dstaddr = dst6;
1195	}
1196
1197	/*
1198	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1199	 * to see if the address is deprecated or invalidated, but initialize
1200	 * these members for applications.
1201	 */
1202	ia->ia6_lifetime = ifra->ifra_lifetime;
1203	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1204		ia->ia6_lifetime.ia6t_expire =
1205		    time_second + ia->ia6_lifetime.ia6t_vltime;
1206	} else
1207		ia->ia6_lifetime.ia6t_expire = 0;
1208	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1209		ia->ia6_lifetime.ia6t_preferred =
1210		    time_second + ia->ia6_lifetime.ia6t_pltime;
1211	} else
1212		ia->ia6_lifetime.ia6t_preferred = 0;
1213
1214	/* reset the interface and routing table appropriately. */
1215	if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1216		goto unlink;
1217
1218	/*
1219	 * configure address flags.
1220	 */
1221	ia->ia6_flags = ifra->ifra_flags;
1222	/*
1223	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1224	 * userland, make it deprecated.
1225	 */
1226	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1227		ia->ia6_lifetime.ia6t_pltime = 0;
1228		ia->ia6_lifetime.ia6t_preferred = time_second;
1229	}
1230	/*
1231	 * Make the address tentative before joining multicast addresses,
1232	 * so that corresponding MLD responses would not have a tentative
1233	 * source address.
1234	 */
1235	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1236	if (hostIsNew && in6if_do_dad(ifp))
1237		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1238
1239	/* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */
1240	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1241		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1242
1243	/*
1244	 * We are done if we have simply modified an existing address.
1245	 */
1246	if (!hostIsNew)
1247		return (error);
1248
1249	/*
1250	 * Beyond this point, we should call in6_purgeaddr upon an error,
1251	 * not just go to unlink.
1252	 */
1253
1254	/* Join necessary multicast groups. */
1255	in6m_sol = NULL;
1256	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1257		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1258		if (error)
1259			goto cleanup;
1260	}
1261
1262	/*
1263	 * Perform DAD, if needed.
1264	 * XXX It may be of use, if we can administratively disable DAD.
1265	 */
1266	if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) &&
1267	    (ia->ia6_flags & IN6_IFF_TENTATIVE))
1268	{
1269		int mindelay, maxdelay;
1270
1271		delay = 0;
1272		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1273			/*
1274			 * We need to impose a delay before sending an NS
1275			 * for DAD.  Check if we also needed a delay for the
1276			 * corresponding MLD message.  If we did, the delay
1277			 * should be larger than the MLD delay (this could be
1278			 * relaxed a bit, but this simple logic is at least
1279			 * safe).
1280			 * XXX: Break data hiding guidelines and look at
1281			 * state for the solicited multicast group.
1282			 */
1283			mindelay = 0;
1284			if (in6m_sol != NULL &&
1285			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1286				mindelay = in6m_sol->in6m_timer;
1287			}
1288			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1289			if (maxdelay - mindelay == 0)
1290				delay = 0;
1291			else {
1292				delay =
1293				    (arc4random() % (maxdelay - mindelay)) +
1294				    mindelay;
1295			}
1296		}
1297		nd6_dad_start((struct ifaddr *)ia, delay);
1298	}
1299
1300	KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew"));
1301	ifa_free(&ia->ia_ifa);
1302	return (error);
1303
1304  unlink:
1305	/*
1306	 * XXX: if a change of an existing address failed, keep the entry
1307	 * anyway.
1308	 */
1309	if (hostIsNew) {
1310		in6_unlink_ifa(ia, ifp);
1311		ifa_free(&ia->ia_ifa);
1312	}
1313	return (error);
1314
1315  cleanup:
1316	KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew"));
1317	ifa_free(&ia->ia_ifa);
1318	in6_purgeaddr(&ia->ia_ifa);
1319	return error;
1320}
1321
1322/*
1323 * Leave multicast groups.  Factored out from in6_purgeaddr().
1324 * This entire work should only be done once, for the default FIB.
1325 */
1326static int
1327in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0)
1328{
1329	struct sockaddr_in6 mltaddr, mltmask;
1330	struct in6_multi_mship *imm;
1331	struct rtentry *rt;
1332	struct sockaddr_in6 sin6;
1333	int error;
1334
1335	/*
1336	 * Leave from multicast groups we have joined for the interface.
1337	 */
1338	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1339		LIST_REMOVE(imm, i6mm_chain);
1340		in6_leavegroup(imm);
1341	}
1342
1343	/*
1344	 * Remove the link-local all-nodes address.
1345	 */
1346	bzero(&mltmask, sizeof(mltmask));
1347	mltmask.sin6_len = sizeof(struct sockaddr_in6);
1348	mltmask.sin6_family = AF_INET6;
1349	mltmask.sin6_addr = in6mask32;
1350
1351	bzero(&mltaddr, sizeof(mltaddr));
1352	mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1353	mltaddr.sin6_family = AF_INET6;
1354	mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1355
1356	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1357		return (error);
1358
1359	/*
1360	 * As for the mltaddr above, proactively prepare the sin6 to avoid
1361	 * rtentry un- and re-locking.
1362	 */
1363	if (ifa0 != NULL) {
1364		bzero(&sin6, sizeof(sin6));
1365		sin6.sin6_len = sizeof(sin6);
1366		sin6.sin6_family = AF_INET6;
1367		memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr,
1368		    sizeof(sin6.sin6_addr));
1369		error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL);
1370		if (error != 0)
1371			return (error);
1372	}
1373
1374	rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1375	if (rt != NULL && rt->rt_gateway != NULL &&
1376	    (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1377		    &ia->ia_addr.sin6_addr,
1378		    sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1379		/*
1380		 * If no more IPv6 address exists on this interface then
1381		 * remove the multicast address route.
1382		 */
1383		if (ifa0 == NULL) {
1384			memcpy(&mltaddr.sin6_addr,
1385			    &satosin6(rt_key(rt))->sin6_addr,
1386			    sizeof(mltaddr.sin6_addr));
1387			RTFREE_LOCKED(rt);
1388			error = in6_rtrequest(RTM_DELETE,
1389			    (struct sockaddr *)&mltaddr,
1390			    (struct sockaddr *)&ia->ia_addr,
1391			    (struct sockaddr *)&mltmask, RTF_UP,
1392			    (struct rtentry **)0, RT_DEFAULT_FIB);
1393			if (error)
1394				log(LOG_INFO, "%s: link-local all-nodes "
1395				    "multicast address deletion error\n",
1396				    __func__);
1397		} else {
1398			/*
1399			 * Replace the gateway of the route.
1400			 */
1401			memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1402			RTFREE_LOCKED(rt);
1403		}
1404	} else {
1405		if (rt != NULL)
1406			RTFREE_LOCKED(rt);
1407	}
1408
1409	/*
1410	 * Remove the node-local all-nodes address.
1411	 */
1412	mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1413	if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0)
1414		return (error);
1415
1416	rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB);
1417	if (rt != NULL && rt->rt_gateway != NULL &&
1418	    (memcmp(&satosin6(rt->rt_gateway)->sin6_addr,
1419		    &ia->ia_addr.sin6_addr,
1420		    sizeof(ia->ia_addr.sin6_addr)) == 0)) {
1421		/*
1422		 * If no more IPv6 address exists on this interface then
1423		 * remove the multicast address route.
1424		 */
1425		if (ifa0 == NULL) {
1426			memcpy(&mltaddr.sin6_addr,
1427			    &satosin6(rt_key(rt))->sin6_addr,
1428			    sizeof(mltaddr.sin6_addr));
1429
1430			RTFREE_LOCKED(rt);
1431			error = in6_rtrequest(RTM_DELETE,
1432			    (struct sockaddr *)&mltaddr,
1433			    (struct sockaddr *)&ia->ia_addr,
1434			    (struct sockaddr *)&mltmask, RTF_UP,
1435			    (struct rtentry **)0, RT_DEFAULT_FIB);
1436			if (error)
1437				log(LOG_INFO, "%s: node-local all-nodes"
1438				    "multicast address deletion error\n",
1439				    __func__);
1440		} else {
1441			/*
1442			 * Replace the gateway of the route.
1443			 */
1444			memcpy(rt->rt_gateway, &sin6, sizeof(sin6));
1445			RTFREE_LOCKED(rt);
1446		}
1447	} else {
1448		if (rt != NULL)
1449			RTFREE_LOCKED(rt);
1450	}
1451
1452	return (0);
1453}
1454
1455void
1456in6_purgeaddr(struct ifaddr *ifa)
1457{
1458	struct ifnet *ifp = ifa->ifa_ifp;
1459	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1460	int plen, error;
1461	struct ifaddr *ifa0;
1462
1463	if (ifa->ifa_carp)
1464		(*carp_detach_p)(ifa);
1465
1466	/*
1467	 * find another IPv6 address as the gateway for the
1468	 * link-local and node-local all-nodes multicast
1469	 * address routes
1470	 */
1471	IF_ADDR_RLOCK(ifp);
1472	TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) {
1473		if ((ifa0->ifa_addr->sa_family != AF_INET6) ||
1474		    memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr,
1475		    &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0)
1476			continue;
1477		else
1478			break;
1479	}
1480	if (ifa0 != NULL)
1481		ifa_ref(ifa0);
1482	IF_ADDR_RUNLOCK(ifp);
1483
1484	/*
1485	 * Remove the loopback route to the interface address.
1486	 * The check for the current setting of "nd6_useloopback"
1487	 * is not needed.
1488	 */
1489	if (ia->ia_flags & IFA_RTSELF) {
1490		error = ifa_del_loopback_route((struct ifaddr *)ia,
1491		    (struct sockaddr *)&ia->ia_addr);
1492		if (error == 0)
1493			ia->ia_flags &= ~IFA_RTSELF;
1494	}
1495
1496	/* stop DAD processing */
1497	nd6_dad_stop(ifa);
1498
1499	/* Remove local address entry from lltable. */
1500	in6_ifremloop(ifa);
1501
1502	/* Leave multicast groups. */
1503	error = in6_purgeaddr_mc(ifp, ia, ifa0);
1504
1505	if (ifa0 != NULL)
1506		ifa_free(ifa0);
1507
1508	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1509	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1510		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1511		    (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0);
1512		if (error != 0)
1513			log(LOG_INFO, "%s: err=%d, destination address delete "
1514			    "failed\n", __func__, error);
1515		ia->ia_flags &= ~IFA_ROUTE;
1516	}
1517
1518	in6_unlink_ifa(ia, ifp);
1519}
1520
1521static void
1522in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1523{
1524
1525	IF_ADDR_WLOCK(ifp);
1526	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1527	IF_ADDR_WUNLOCK(ifp);
1528	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1529
1530	/*
1531	 * Defer the release of what might be the last reference to the
1532	 * in6_ifaddr so that it can't be freed before the remainder of the
1533	 * cleanup.
1534	 */
1535	IN6_IFADDR_WLOCK();
1536	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1537	IN6_IFADDR_WUNLOCK();
1538
1539	/*
1540	 * Release the reference to the base prefix.  There should be a
1541	 * positive reference.
1542	 */
1543	if (ia->ia6_ndpr == NULL) {
1544		nd6log((LOG_NOTICE,
1545		    "in6_unlink_ifa: autoconf'ed address "
1546		    "%p has no prefix\n", ia));
1547	} else {
1548		ia->ia6_ndpr->ndpr_refcnt--;
1549		ia->ia6_ndpr = NULL;
1550	}
1551
1552	/*
1553	 * Also, if the address being removed is autoconf'ed, call
1554	 * pfxlist_onlink_check() since the release might affect the status of
1555	 * other (detached) addresses.
1556	 */
1557	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1558		pfxlist_onlink_check();
1559	}
1560	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1561}
1562
1563void
1564in6_purgeif(struct ifnet *ifp)
1565{
1566	struct ifaddr *ifa, *nifa;
1567
1568	TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1569		if (ifa->ifa_addr->sa_family != AF_INET6)
1570			continue;
1571		in6_purgeaddr(ifa);
1572	}
1573
1574	in6_ifdetach(ifp);
1575}
1576
1577/*
1578 * SIOC[GAD]LIFADDR.
1579 *	SIOCGLIFADDR: get first address. (?)
1580 *	SIOCGLIFADDR with IFLR_PREFIX:
1581 *		get first address that matches the specified prefix.
1582 *	SIOCALIFADDR: add the specified address.
1583 *	SIOCALIFADDR with IFLR_PREFIX:
1584 *		add the specified prefix, filling hostid part from
1585 *		the first link-local address.  prefixlen must be <= 64.
1586 *	SIOCDLIFADDR: delete the specified address.
1587 *	SIOCDLIFADDR with IFLR_PREFIX:
1588 *		delete the first address that matches the specified prefix.
1589 * return values:
1590 *	EINVAL on invalid parameters
1591 *	EADDRNOTAVAIL on prefix match failed/specified address not found
1592 *	other values may be returned from in6_ioctl()
1593 *
1594 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1595 * this is to accomodate address naming scheme other than RFC2374,
1596 * in the future.
1597 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1598 * address encoding scheme. (see figure on page 8)
1599 */
1600static int
1601in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1602    struct ifnet *ifp, struct thread *td)
1603{
1604	struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1605	struct ifaddr *ifa;
1606	struct sockaddr *sa;
1607
1608	/* sanity checks */
1609	if (!data || !ifp) {
1610		panic("invalid argument to in6_lifaddr_ioctl");
1611		/* NOTREACHED */
1612	}
1613
1614	switch (cmd) {
1615	case SIOCGLIFADDR:
1616		/* address must be specified on GET with IFLR_PREFIX */
1617		if ((iflr->flags & IFLR_PREFIX) == 0)
1618			break;
1619		/* FALLTHROUGH */
1620	case SIOCALIFADDR:
1621	case SIOCDLIFADDR:
1622		/* address must be specified on ADD and DELETE */
1623		sa = (struct sockaddr *)&iflr->addr;
1624		if (sa->sa_family != AF_INET6)
1625			return EINVAL;
1626		if (sa->sa_len != sizeof(struct sockaddr_in6))
1627			return EINVAL;
1628		/* XXX need improvement */
1629		sa = (struct sockaddr *)&iflr->dstaddr;
1630		if (sa->sa_family && sa->sa_family != AF_INET6)
1631			return EINVAL;
1632		if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1633			return EINVAL;
1634		break;
1635	default: /* shouldn't happen */
1636#if 0
1637		panic("invalid cmd to in6_lifaddr_ioctl");
1638		/* NOTREACHED */
1639#else
1640		return EOPNOTSUPP;
1641#endif
1642	}
1643	if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1644		return EINVAL;
1645
1646	switch (cmd) {
1647	case SIOCALIFADDR:
1648	    {
1649		struct in6_aliasreq ifra;
1650		struct in6_addr *hostid = NULL;
1651		int prefixlen;
1652
1653		ifa = NULL;
1654		if ((iflr->flags & IFLR_PREFIX) != 0) {
1655			struct sockaddr_in6 *sin6;
1656
1657			/*
1658			 * hostid is to fill in the hostid part of the
1659			 * address.  hostid points to the first link-local
1660			 * address attached to the interface.
1661			 */
1662			ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1663			if (!ifa)
1664				return EADDRNOTAVAIL;
1665			hostid = IFA_IN6(ifa);
1666
1667			/* prefixlen must be <= 64. */
1668			if (64 < iflr->prefixlen) {
1669				if (ifa != NULL)
1670					ifa_free(ifa);
1671				return EINVAL;
1672			}
1673			prefixlen = iflr->prefixlen;
1674
1675			/* hostid part must be zero. */
1676			sin6 = (struct sockaddr_in6 *)&iflr->addr;
1677			if (sin6->sin6_addr.s6_addr32[2] != 0 ||
1678			    sin6->sin6_addr.s6_addr32[3] != 0) {
1679				if (ifa != NULL)
1680					ifa_free(ifa);
1681				return EINVAL;
1682			}
1683		} else
1684			prefixlen = iflr->prefixlen;
1685
1686		/* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1687		bzero(&ifra, sizeof(ifra));
1688		bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name));
1689
1690		bcopy(&iflr->addr, &ifra.ifra_addr,
1691		    ((struct sockaddr *)&iflr->addr)->sa_len);
1692		if (hostid) {
1693			/* fill in hostid part */
1694			ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1695			    hostid->s6_addr32[2];
1696			ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1697			    hostid->s6_addr32[3];
1698		}
1699
1700		if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */
1701			bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1702			    ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1703			if (hostid) {
1704				ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1705				    hostid->s6_addr32[2];
1706				ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1707				    hostid->s6_addr32[3];
1708			}
1709		}
1710		if (ifa != NULL)
1711			ifa_free(ifa);
1712
1713		ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1714		in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1715
1716		ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1717		return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1718	    }
1719	case SIOCGLIFADDR:
1720	case SIOCDLIFADDR:
1721	    {
1722		struct in6_ifaddr *ia;
1723		struct in6_addr mask, candidate, match;
1724		struct sockaddr_in6 *sin6;
1725		int cmp;
1726
1727		bzero(&mask, sizeof(mask));
1728		if (iflr->flags & IFLR_PREFIX) {
1729			/* lookup a prefix rather than address. */
1730			in6_prefixlen2mask(&mask, iflr->prefixlen);
1731
1732			sin6 = (struct sockaddr_in6 *)&iflr->addr;
1733			bcopy(&sin6->sin6_addr, &match, sizeof(match));
1734			match.s6_addr32[0] &= mask.s6_addr32[0];
1735			match.s6_addr32[1] &= mask.s6_addr32[1];
1736			match.s6_addr32[2] &= mask.s6_addr32[2];
1737			match.s6_addr32[3] &= mask.s6_addr32[3];
1738
1739			/* if you set extra bits, that's wrong */
1740			if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1741				return EINVAL;
1742
1743			cmp = 1;
1744		} else {
1745			if (cmd == SIOCGLIFADDR) {
1746				/* on getting an address, take the 1st match */
1747				cmp = 0;	/* XXX */
1748			} else {
1749				/* on deleting an address, do exact match */
1750				in6_prefixlen2mask(&mask, 128);
1751				sin6 = (struct sockaddr_in6 *)&iflr->addr;
1752				bcopy(&sin6->sin6_addr, &match, sizeof(match));
1753
1754				cmp = 1;
1755			}
1756		}
1757
1758		IF_ADDR_RLOCK(ifp);
1759		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1760			if (ifa->ifa_addr->sa_family != AF_INET6)
1761				continue;
1762			if (!cmp)
1763				break;
1764
1765			/*
1766			 * XXX: this is adhoc, but is necessary to allow
1767			 * a user to specify fe80::/64 (not /10) for a
1768			 * link-local address.
1769			 */
1770			bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1771			in6_clearscope(&candidate);
1772			candidate.s6_addr32[0] &= mask.s6_addr32[0];
1773			candidate.s6_addr32[1] &= mask.s6_addr32[1];
1774			candidate.s6_addr32[2] &= mask.s6_addr32[2];
1775			candidate.s6_addr32[3] &= mask.s6_addr32[3];
1776			if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1777				break;
1778		}
1779		if (ifa != NULL)
1780			ifa_ref(ifa);
1781		IF_ADDR_RUNLOCK(ifp);
1782		if (!ifa)
1783			return EADDRNOTAVAIL;
1784		ia = ifa2ia6(ifa);
1785
1786		if (cmd == SIOCGLIFADDR) {
1787			int error;
1788
1789			/* fill in the if_laddrreq structure */
1790			bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1791			error = sa6_recoverscope(
1792			    (struct sockaddr_in6 *)&iflr->addr);
1793			if (error != 0) {
1794				ifa_free(ifa);
1795				return (error);
1796			}
1797
1798			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1799				bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1800				    ia->ia_dstaddr.sin6_len);
1801				error = sa6_recoverscope(
1802				    (struct sockaddr_in6 *)&iflr->dstaddr);
1803				if (error != 0) {
1804					ifa_free(ifa);
1805					return (error);
1806				}
1807			} else
1808				bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1809
1810			iflr->prefixlen =
1811			    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
1812
1813			iflr->flags = ia->ia6_flags;	/* XXX */
1814			ifa_free(ifa);
1815
1816			return 0;
1817		} else {
1818			struct in6_aliasreq ifra;
1819
1820			/* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1821			bzero(&ifra, sizeof(ifra));
1822			bcopy(iflr->iflr_name, ifra.ifra_name,
1823			    sizeof(ifra.ifra_name));
1824
1825			bcopy(&ia->ia_addr, &ifra.ifra_addr,
1826			    ia->ia_addr.sin6_len);
1827			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1828				bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1829				    ia->ia_dstaddr.sin6_len);
1830			} else {
1831				bzero(&ifra.ifra_dstaddr,
1832				    sizeof(ifra.ifra_dstaddr));
1833			}
1834			bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1835			    ia->ia_prefixmask.sin6_len);
1836
1837			ifra.ifra_flags = ia->ia6_flags;
1838			ifa_free(ifa);
1839			return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1840			    ifp, td);
1841		}
1842	    }
1843	}
1844
1845	return EOPNOTSUPP;	/* just for safety */
1846}
1847
1848/*
1849 * Initialize an interface's IPv6 address and routing table entry.
1850 */
1851static int
1852in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia,
1853    struct sockaddr_in6 *sin6, int newhost)
1854{
1855	int	error = 0, plen, ifacount = 0;
1856	struct ifaddr *ifa;
1857
1858	/*
1859	 * Give the interface a chance to initialize
1860	 * if this is its first address,
1861	 * and to validate the address if necessary.
1862	 */
1863	IF_ADDR_RLOCK(ifp);
1864	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1865		if (ifa->ifa_addr->sa_family != AF_INET6)
1866			continue;
1867		ifacount++;
1868	}
1869	IF_ADDR_RUNLOCK(ifp);
1870
1871	ia->ia_addr = *sin6;
1872
1873	if (ifacount <= 1 && ifp->if_ioctl) {
1874		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1875		if (error)
1876			return (error);
1877	}
1878
1879	ia->ia_ifa.ifa_metric = ifp->if_metric;
1880
1881	/* we could do in(6)_socktrim here, but just omit it at this moment. */
1882
1883	/*
1884	 * Special case:
1885	 * If a new destination address is specified for a point-to-point
1886	 * interface, install a route to the destination as an interface
1887	 * direct route.
1888	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1889	 * interface that share the same destination.
1890	 */
1891	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1892	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1893	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1894		int rtflags = RTF_UP | RTF_HOST;
1895		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1896		if (error)
1897			return (error);
1898		ia->ia_flags |= IFA_ROUTE;
1899		/*
1900		 * Handle the case for ::1 .
1901		 */
1902		if (ifp->if_flags & IFF_LOOPBACK)
1903			ia->ia_flags |= IFA_RTSELF;
1904	}
1905
1906	/*
1907	 * add a loopback route to self
1908	 */
1909	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1910		error = ifa_add_loopback_route((struct ifaddr *)ia,
1911		    (struct sockaddr *)&ia->ia_addr);
1912		if (error == 0)
1913			ia->ia_flags |= IFA_RTSELF;
1914	}
1915
1916	/* Add local address to lltable, if necessary (ex. on p2p link). */
1917	if (newhost)
1918		in6_ifaddloop(&(ia->ia_ifa));
1919
1920	return (error);
1921}
1922
1923/*
1924 * Find an IPv6 interface link-local address specific to an interface.
1925 * ifaddr is returned referenced.
1926 */
1927struct in6_ifaddr *
1928in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1929{
1930	struct ifaddr *ifa;
1931
1932	IF_ADDR_RLOCK(ifp);
1933	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1934		if (ifa->ifa_addr->sa_family != AF_INET6)
1935			continue;
1936		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1937			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1938			    ignoreflags) != 0)
1939				continue;
1940			ifa_ref(ifa);
1941			break;
1942		}
1943	}
1944	IF_ADDR_RUNLOCK(ifp);
1945
1946	return ((struct in6_ifaddr *)ifa);
1947}
1948
1949
1950/*
1951 * find the internet address corresponding to a given interface and address.
1952 * ifaddr is returned referenced.
1953 */
1954struct in6_ifaddr *
1955in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1956{
1957	struct ifaddr *ifa;
1958
1959	IF_ADDR_RLOCK(ifp);
1960	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1961		if (ifa->ifa_addr->sa_family != AF_INET6)
1962			continue;
1963		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1964			ifa_ref(ifa);
1965			break;
1966		}
1967	}
1968	IF_ADDR_RUNLOCK(ifp);
1969
1970	return ((struct in6_ifaddr *)ifa);
1971}
1972
1973/*
1974 * Convert IP6 address to printable (loggable) representation. Caller
1975 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1976 */
1977static char digits[] = "0123456789abcdef";
1978char *
1979ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1980{
1981	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1982	char *cp;
1983	const u_int16_t *a = (const u_int16_t *)addr;
1984	const u_int8_t *d;
1985	int dcolon = 0, zero = 0;
1986
1987	cp = ip6buf;
1988
1989	for (i = 0; i < 8; i++) {
1990		if (*(a + i) == 0) {
1991			cnt++;
1992			if (cnt == 1)
1993				idx = i;
1994		}
1995		else if (maxcnt < cnt) {
1996			maxcnt = cnt;
1997			index = idx;
1998			cnt = 0;
1999		}
2000	}
2001	if (maxcnt < cnt) {
2002		maxcnt = cnt;
2003		index = idx;
2004	}
2005
2006	for (i = 0; i < 8; i++) {
2007		if (dcolon == 1) {
2008			if (*a == 0) {
2009				if (i == 7)
2010					*cp++ = ':';
2011				a++;
2012				continue;
2013			} else
2014				dcolon = 2;
2015		}
2016		if (*a == 0) {
2017			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
2018				if (i == 0)
2019					*cp++ = ':';
2020				*cp++ = ':';
2021				dcolon = 1;
2022			} else {
2023				*cp++ = '0';
2024				*cp++ = ':';
2025			}
2026			a++;
2027			continue;
2028		}
2029		d = (const u_char *)a;
2030		/* Try to eliminate leading zeros in printout like in :0001. */
2031		zero = 1;
2032		*cp = digits[*d >> 4];
2033		if (*cp != '0') {
2034			zero = 0;
2035			cp++;
2036		}
2037		*cp = digits[*d++ & 0xf];
2038		if (zero == 0 || (*cp != '0')) {
2039			zero = 0;
2040			cp++;
2041		}
2042		*cp = digits[*d >> 4];
2043		if (zero == 0 || (*cp != '0')) {
2044			zero = 0;
2045			cp++;
2046		}
2047		*cp++ = digits[*d & 0xf];
2048		*cp++ = ':';
2049		a++;
2050	}
2051	*--cp = '\0';
2052	return (ip6buf);
2053}
2054
2055int
2056in6_localaddr(struct in6_addr *in6)
2057{
2058	struct in6_ifaddr *ia;
2059
2060	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
2061		return 1;
2062
2063	IN6_IFADDR_RLOCK();
2064	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2065		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
2066		    &ia->ia_prefixmask.sin6_addr)) {
2067			IN6_IFADDR_RUNLOCK();
2068			return 1;
2069		}
2070	}
2071	IN6_IFADDR_RUNLOCK();
2072
2073	return (0);
2074}
2075
2076/*
2077 * Return 1 if an internet address is for the local host and configured
2078 * on one of its interfaces.
2079 */
2080int
2081in6_localip(struct in6_addr *in6)
2082{
2083	struct in6_ifaddr *ia;
2084
2085	IN6_IFADDR_RLOCK();
2086	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2087		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
2088			IN6_IFADDR_RUNLOCK();
2089			return (1);
2090		}
2091	}
2092	IN6_IFADDR_RUNLOCK();
2093	return (0);
2094}
2095
2096
2097int
2098in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
2099{
2100	struct in6_ifaddr *ia;
2101
2102	IN6_IFADDR_RLOCK();
2103	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
2104		if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
2105		    &sa6->sin6_addr) &&
2106		    (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) {
2107			IN6_IFADDR_RUNLOCK();
2108			return (1); /* true */
2109		}
2110
2111		/* XXX: do we still have to go thru the rest of the list? */
2112	}
2113	IN6_IFADDR_RUNLOCK();
2114
2115	return (0);		/* false */
2116}
2117
2118/*
2119 * return length of part which dst and src are equal
2120 * hard coding...
2121 */
2122int
2123in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2124{
2125	int match = 0;
2126	u_char *s = (u_char *)src, *d = (u_char *)dst;
2127	u_char *lim = s + 16, r;
2128
2129	while (s < lim)
2130		if ((r = (*d++ ^ *s++)) != 0) {
2131			while (r < 128) {
2132				match++;
2133				r <<= 1;
2134			}
2135			break;
2136		} else
2137			match += 8;
2138	return match;
2139}
2140
2141/* XXX: to be scope conscious */
2142int
2143in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2144{
2145	int bytelen, bitlen;
2146
2147	/* sanity check */
2148	if (0 > len || len > 128) {
2149		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2150		    len);
2151		return (0);
2152	}
2153
2154	bytelen = len / 8;
2155	bitlen = len % 8;
2156
2157	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2158		return (0);
2159	if (bitlen != 0 &&
2160	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
2161	    p2->s6_addr[bytelen] >> (8 - bitlen))
2162		return (0);
2163
2164	return (1);
2165}
2166
2167void
2168in6_prefixlen2mask(struct in6_addr *maskp, int len)
2169{
2170	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2171	int bytelen, bitlen, i;
2172
2173	/* sanity check */
2174	if (0 > len || len > 128) {
2175		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2176		    len);
2177		return;
2178	}
2179
2180	bzero(maskp, sizeof(*maskp));
2181	bytelen = len / 8;
2182	bitlen = len % 8;
2183	for (i = 0; i < bytelen; i++)
2184		maskp->s6_addr[i] = 0xff;
2185	if (bitlen)
2186		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2187}
2188
2189/*
2190 * return the best address out of the same scope. if no address was
2191 * found, return the first valid address from designated IF.
2192 */
2193struct in6_ifaddr *
2194in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2195{
2196	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
2197	struct ifaddr *ifa;
2198	struct in6_ifaddr *besta = 0;
2199	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
2200
2201	dep[0] = dep[1] = NULL;
2202
2203	/*
2204	 * We first look for addresses in the same scope.
2205	 * If there is one, return it.
2206	 * If two or more, return one which matches the dst longest.
2207	 * If none, return one of global addresses assigned other ifs.
2208	 */
2209	IF_ADDR_RLOCK(ifp);
2210	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2211		if (ifa->ifa_addr->sa_family != AF_INET6)
2212			continue;
2213		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2214			continue; /* XXX: is there any case to allow anycast? */
2215		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2216			continue; /* don't use this interface */
2217		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2218			continue;
2219		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2220			if (V_ip6_use_deprecated)
2221				dep[0] = (struct in6_ifaddr *)ifa;
2222			continue;
2223		}
2224
2225		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2226			/*
2227			 * call in6_matchlen() as few as possible
2228			 */
2229			if (besta) {
2230				if (blen == -1)
2231					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2232				tlen = in6_matchlen(IFA_IN6(ifa), dst);
2233				if (tlen > blen) {
2234					blen = tlen;
2235					besta = (struct in6_ifaddr *)ifa;
2236				}
2237			} else
2238				besta = (struct in6_ifaddr *)ifa;
2239		}
2240	}
2241	if (besta) {
2242		ifa_ref(&besta->ia_ifa);
2243		IF_ADDR_RUNLOCK(ifp);
2244		return (besta);
2245	}
2246
2247	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2248		if (ifa->ifa_addr->sa_family != AF_INET6)
2249			continue;
2250		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2251			continue; /* XXX: is there any case to allow anycast? */
2252		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2253			continue; /* don't use this interface */
2254		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2255			continue;
2256		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2257			if (V_ip6_use_deprecated)
2258				dep[1] = (struct in6_ifaddr *)ifa;
2259			continue;
2260		}
2261
2262		if (ifa != NULL)
2263			ifa_ref(ifa);
2264		IF_ADDR_RUNLOCK(ifp);
2265		return (struct in6_ifaddr *)ifa;
2266	}
2267
2268	/* use the last-resort values, that are, deprecated addresses */
2269	if (dep[0]) {
2270		ifa_ref((struct ifaddr *)dep[0]);
2271		IF_ADDR_RUNLOCK(ifp);
2272		return dep[0];
2273	}
2274	if (dep[1]) {
2275		ifa_ref((struct ifaddr *)dep[1]);
2276		IF_ADDR_RUNLOCK(ifp);
2277		return dep[1];
2278	}
2279
2280	IF_ADDR_RUNLOCK(ifp);
2281	return NULL;
2282}
2283
2284/*
2285 * perform DAD when interface becomes IFF_UP.
2286 */
2287void
2288in6_if_up(struct ifnet *ifp)
2289{
2290	struct ifaddr *ifa;
2291	struct in6_ifaddr *ia;
2292
2293	IF_ADDR_RLOCK(ifp);
2294	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2295		if (ifa->ifa_addr->sa_family != AF_INET6)
2296			continue;
2297		ia = (struct in6_ifaddr *)ifa;
2298		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2299			/*
2300			 * The TENTATIVE flag was likely set by hand
2301			 * beforehand, implicitly indicating the need for DAD.
2302			 * We may be able to skip the random delay in this
2303			 * case, but we impose delays just in case.
2304			 */
2305			nd6_dad_start(ifa,
2306			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2307		}
2308	}
2309	IF_ADDR_RUNLOCK(ifp);
2310
2311	/*
2312	 * special cases, like 6to4, are handled in in6_ifattach
2313	 */
2314	in6_ifattach(ifp, NULL);
2315}
2316
2317int
2318in6if_do_dad(struct ifnet *ifp)
2319{
2320	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2321		return (0);
2322
2323	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
2324		return (0);
2325
2326	switch (ifp->if_type) {
2327#ifdef IFT_DUMMY
2328	case IFT_DUMMY:
2329#endif
2330	case IFT_FAITH:
2331		/*
2332		 * These interfaces do not have the IFF_LOOPBACK flag,
2333		 * but loop packets back.  We do not have to do DAD on such
2334		 * interfaces.  We should even omit it, because loop-backed
2335		 * NS would confuse the DAD procedure.
2336		 */
2337		return (0);
2338	default:
2339		/*
2340		 * Our DAD routine requires the interface up and running.
2341		 * However, some interfaces can be up before the RUNNING
2342		 * status.  Additionaly, users may try to assign addresses
2343		 * before the interface becomes up (or running).
2344		 * We simply skip DAD in such a case as a work around.
2345		 * XXX: we should rather mark "tentative" on such addresses,
2346		 * and do DAD after the interface becomes ready.
2347		 */
2348		if (!((ifp->if_flags & IFF_UP) &&
2349		    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
2350			return (0);
2351
2352		return (1);
2353	}
2354}
2355
2356/*
2357 * Calculate max IPv6 MTU through all the interfaces and store it
2358 * to in6_maxmtu.
2359 */
2360void
2361in6_setmaxmtu(void)
2362{
2363	unsigned long maxmtu = 0;
2364	struct ifnet *ifp;
2365
2366	IFNET_RLOCK_NOSLEEP();
2367	TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
2368		/* this function can be called during ifnet initialization */
2369		if (!ifp->if_afdata[AF_INET6])
2370			continue;
2371		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2372		    IN6_LINKMTU(ifp) > maxmtu)
2373			maxmtu = IN6_LINKMTU(ifp);
2374	}
2375	IFNET_RUNLOCK_NOSLEEP();
2376	if (maxmtu)	/* update only when maxmtu is positive */
2377		V_in6_maxmtu = maxmtu;
2378}
2379
2380/*
2381 * Provide the length of interface identifiers to be used for the link attached
2382 * to the given interface.  The length should be defined in "IPv6 over
2383 * xxx-link" document.  Note that address architecture might also define
2384 * the length for a particular set of address prefixes, regardless of the
2385 * link type.  As clarified in rfc2462bis, those two definitions should be
2386 * consistent, and those really are as of August 2004.
2387 */
2388int
2389in6_if2idlen(struct ifnet *ifp)
2390{
2391	switch (ifp->if_type) {
2392	case IFT_ETHER:		/* RFC2464 */
2393#ifdef IFT_PROPVIRTUAL
2394	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
2395#endif
2396#ifdef IFT_L2VLAN
2397	case IFT_L2VLAN:	/* ditto */
2398#endif
2399#ifdef IFT_IEEE80211
2400	case IFT_IEEE80211:	/* ditto */
2401#endif
2402#ifdef IFT_MIP
2403	case IFT_MIP:	/* ditto */
2404#endif
2405	case IFT_INFINIBAND:
2406		return (64);
2407	case IFT_FDDI:		/* RFC2467 */
2408		return (64);
2409	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
2410		return (64);
2411	case IFT_PPP:		/* RFC2472 */
2412		return (64);
2413	case IFT_ARCNET:	/* RFC2497 */
2414		return (64);
2415	case IFT_FRELAY:	/* RFC2590 */
2416		return (64);
2417	case IFT_IEEE1394:	/* RFC3146 */
2418		return (64);
2419	case IFT_GIF:
2420		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
2421	case IFT_LOOP:
2422		return (64);	/* XXX: is this really correct? */
2423	default:
2424		/*
2425		 * Unknown link type:
2426		 * It might be controversial to use the today's common constant
2427		 * of 64 for these cases unconditionally.  For full compliance,
2428		 * we should return an error in this case.  On the other hand,
2429		 * if we simply miss the standard for the link type or a new
2430		 * standard is defined for a new link type, the IFID length
2431		 * is very likely to be the common constant.  As a compromise,
2432		 * we always use the constant, but make an explicit notice
2433		 * indicating the "unknown" case.
2434		 */
2435		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2436		return (64);
2437	}
2438}
2439
2440#include <sys/sysctl.h>
2441
2442struct in6_llentry {
2443	struct llentry		base;
2444	struct sockaddr_in6	l3_addr6;
2445};
2446
2447/*
2448 * Deletes an address from the address table.
2449 * This function is called by the timer functions
2450 * such as arptimer() and nd6_llinfo_timer(), and
2451 * the caller does the locking.
2452 */
2453static void
2454in6_lltable_free(struct lltable *llt, struct llentry *lle)
2455{
2456	LLE_WUNLOCK(lle);
2457	LLE_LOCK_DESTROY(lle);
2458	free(lle, M_LLTABLE);
2459}
2460
2461static struct llentry *
2462in6_lltable_new(const struct sockaddr *l3addr, u_int flags)
2463{
2464	struct in6_llentry *lle;
2465
2466	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2467	if (lle == NULL)		/* NB: caller generates msg */
2468		return NULL;
2469
2470	lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr;
2471	lle->base.lle_refcnt = 1;
2472	lle->base.lle_free = in6_lltable_free;
2473	LLE_LOCK_INIT(&lle->base);
2474	callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock,
2475	    CALLOUT_RETURNUNLOCKED);
2476
2477	return (&lle->base);
2478}
2479
2480static void
2481in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix,
2482    const struct sockaddr *mask, u_int flags)
2483{
2484	const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix;
2485	const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask;
2486	struct llentry *lle, *next;
2487	int i;
2488
2489	/*
2490	 * (flags & LLE_STATIC) means deleting all entries
2491	 * including static ND6 entries.
2492	 */
2493	IF_AFDATA_WLOCK(llt->llt_ifp);
2494	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2495		LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
2496			if (IN6_ARE_MASKED_ADDR_EQUAL(
2497			    &satosin6(L3_ADDR(lle))->sin6_addr,
2498			    &pfx->sin6_addr, &msk->sin6_addr) &&
2499			    ((flags & LLE_STATIC) ||
2500			    !(lle->la_flags & LLE_STATIC))) {
2501				LLE_WLOCK(lle);
2502				if (callout_stop(&lle->la_timer))
2503					LLE_REMREF(lle);
2504				llentry_free(lle);
2505			}
2506		}
2507	}
2508	IF_AFDATA_WUNLOCK(llt->llt_ifp);
2509}
2510
2511static int
2512in6_lltable_rtcheck(struct ifnet *ifp,
2513		    u_int flags,
2514		    const struct sockaddr *l3addr)
2515{
2516	struct rtentry *rt;
2517	char ip6buf[INET6_ADDRSTRLEN];
2518
2519	KASSERT(l3addr->sa_family == AF_INET6,
2520	    ("sin_family %d", l3addr->sa_family));
2521
2522	/* Our local addresses are always only installed on the default FIB. */
2523	/* XXX rtalloc1 should take a const param */
2524	rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0,
2525	    RT_DEFAULT_FIB);
2526	if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) {
2527		struct ifaddr *ifa;
2528		/*
2529		 * Create an ND6 cache for an IPv6 neighbor
2530		 * that is not covered by our own prefix.
2531		 */
2532		/* XXX ifaof_ifpforaddr should take a const param */
2533		ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp);
2534		if (ifa != NULL) {
2535			ifa_free(ifa);
2536			if (rt != NULL)
2537				RTFREE_LOCKED(rt);
2538			return 0;
2539		}
2540		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2541		    ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr));
2542		if (rt != NULL)
2543			RTFREE_LOCKED(rt);
2544		return EINVAL;
2545	}
2546	RTFREE_LOCKED(rt);
2547	return 0;
2548}
2549
2550static struct llentry *
2551in6_lltable_lookup(struct lltable *llt, u_int flags,
2552	const struct sockaddr *l3addr)
2553{
2554	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2555	struct ifnet *ifp = llt->llt_ifp;
2556	struct llentry *lle;
2557	struct llentries *lleh;
2558	u_int hashkey;
2559
2560	IF_AFDATA_LOCK_ASSERT(ifp);
2561	KASSERT(l3addr->sa_family == AF_INET6,
2562	    ("sin_family %d", l3addr->sa_family));
2563
2564	hashkey = sin6->sin6_addr.s6_addr32[3];
2565	lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
2566	LIST_FOREACH(lle, lleh, lle_next) {
2567		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle);
2568		if (lle->la_flags & LLE_DELETED)
2569			continue;
2570		if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr,
2571		    sizeof(struct in6_addr)) == 0)
2572			break;
2573	}
2574
2575	if (lle == NULL) {
2576		if (!(flags & LLE_CREATE))
2577			return (NULL);
2578		/*
2579		 * A route that covers the given address must have
2580		 * been installed 1st because we are doing a resolution,
2581		 * verify this.
2582		 */
2583		if (!(flags & LLE_IFADDR) &&
2584		    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2585			return NULL;
2586
2587		lle = in6_lltable_new(l3addr, flags);
2588		if (lle == NULL) {
2589			log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2590			return NULL;
2591		}
2592		lle->la_flags = flags & ~LLE_CREATE;
2593		if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
2594			bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
2595			lle->la_flags |= (LLE_VALID | LLE_STATIC);
2596		}
2597
2598		lle->lle_tbl  = llt;
2599		lle->lle_head = lleh;
2600		lle->la_flags |= LLE_LINKED;
2601		LIST_INSERT_HEAD(lleh, lle, lle_next);
2602	} else if (flags & LLE_DELETE) {
2603		if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
2604			LLE_WLOCK(lle);
2605			lle->la_flags |= LLE_DELETED;
2606			LLE_WUNLOCK(lle);
2607#ifdef DIAGNOSTIC
2608			log(LOG_INFO, "ifaddr cache = %p  is deleted\n", lle);
2609#endif
2610		}
2611		lle = (void *)-1;
2612	}
2613	if (LLE_IS_VALID(lle)) {
2614		if (flags & LLE_EXCLUSIVE)
2615			LLE_WLOCK(lle);
2616		else
2617			LLE_RLOCK(lle);
2618	}
2619	return (lle);
2620}
2621
2622static int
2623in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
2624{
2625	struct ifnet *ifp = llt->llt_ifp;
2626	struct llentry *lle;
2627	/* XXX stack use */
2628	struct {
2629		struct rt_msghdr	rtm;
2630		struct sockaddr_in6	sin6;
2631		/*
2632		 * ndp.c assumes that sdl is word aligned
2633		 */
2634#ifdef __LP64__
2635		uint32_t		pad;
2636#endif
2637		struct sockaddr_dl	sdl;
2638	} ndpc;
2639	int i, error;
2640
2641	if (ifp->if_flags & IFF_LOOPBACK)
2642		return 0;
2643
2644	LLTABLE_LOCK_ASSERT();
2645
2646	error = 0;
2647	for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
2648		LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
2649			struct sockaddr_dl *sdl;
2650
2651			/* skip deleted or invalid entries */
2652			if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID)
2653				continue;
2654			/* Skip if jailed and not a valid IP of the prison. */
2655			if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
2656				continue;
2657			/*
2658			 * produce a msg made of:
2659			 *  struct rt_msghdr;
2660			 *  struct sockaddr_in6 (IPv6)
2661			 *  struct sockaddr_dl;
2662			 */
2663			bzero(&ndpc, sizeof(ndpc));
2664			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2665			ndpc.rtm.rtm_version = RTM_VERSION;
2666			ndpc.rtm.rtm_type = RTM_GET;
2667			ndpc.rtm.rtm_flags = RTF_UP;
2668			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2669			ndpc.sin6.sin6_family = AF_INET6;
2670			ndpc.sin6.sin6_len = sizeof(ndpc.sin6);
2671			bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle));
2672
2673			/* publish */
2674			if (lle->la_flags & LLE_PUB)
2675				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2676
2677			sdl = &ndpc.sdl;
2678			sdl->sdl_family = AF_LINK;
2679			sdl->sdl_len = sizeof(*sdl);
2680			sdl->sdl_alen = ifp->if_addrlen;
2681			sdl->sdl_index = ifp->if_index;
2682			sdl->sdl_type = ifp->if_type;
2683			bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2684			ndpc.rtm.rtm_rmx.rmx_expire =
2685			    lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
2686			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2687			if (lle->la_flags & LLE_STATIC)
2688				ndpc.rtm.rtm_flags |= RTF_STATIC;
2689			ndpc.rtm.rtm_index = ifp->if_index;
2690			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2691			if (error)
2692				break;
2693		}
2694	}
2695	return error;
2696}
2697
2698void *
2699in6_domifattach(struct ifnet *ifp)
2700{
2701	struct in6_ifextra *ext;
2702
2703	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2704	bzero(ext, sizeof(*ext));
2705
2706	ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat),
2707	    M_IFADDR, M_WAITOK);
2708	bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2709
2710	ext->icmp6_ifstat =
2711	    (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat),
2712	    M_IFADDR, M_WAITOK);
2713	bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2714
2715	ext->nd_ifinfo = nd6_ifattach(ifp);
2716	ext->scope6_id = scope6_ifattach(ifp);
2717	ext->lltable = lltable_init(ifp, AF_INET6);
2718	if (ext->lltable != NULL) {
2719		ext->lltable->llt_prefix_free = in6_lltable_prefix_free;
2720		ext->lltable->llt_lookup = in6_lltable_lookup;
2721		ext->lltable->llt_dump = in6_lltable_dump;
2722	}
2723
2724	ext->mld_ifinfo = mld_domifattach(ifp);
2725
2726	return ext;
2727}
2728
2729void
2730in6_domifdetach(struct ifnet *ifp, void *aux)
2731{
2732	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2733
2734	mld_domifdetach(ifp);
2735	scope6_ifdetach(ext->scope6_id);
2736	nd6_ifdetach(ext->nd_ifinfo);
2737	lltable_free(ext->lltable);
2738	free(ext->in6_ifstat, M_IFADDR);
2739	free(ext->icmp6_ifstat, M_IFADDR);
2740	free(ext, M_IFADDR);
2741}
2742
2743/*
2744 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2745 * v4 mapped addr or v4 compat addr
2746 */
2747void
2748in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2749{
2750
2751	bzero(sin, sizeof(*sin));
2752	sin->sin_len = sizeof(struct sockaddr_in);
2753	sin->sin_family = AF_INET;
2754	sin->sin_port = sin6->sin6_port;
2755	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2756}
2757
2758/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2759void
2760in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2761{
2762	bzero(sin6, sizeof(*sin6));
2763	sin6->sin6_len = sizeof(struct sockaddr_in6);
2764	sin6->sin6_family = AF_INET6;
2765	sin6->sin6_port = sin->sin_port;
2766	sin6->sin6_addr.s6_addr32[0] = 0;
2767	sin6->sin6_addr.s6_addr32[1] = 0;
2768	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2769	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2770}
2771
2772/* Convert sockaddr_in6 into sockaddr_in. */
2773void
2774in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2775{
2776	struct sockaddr_in *sin_p;
2777	struct sockaddr_in6 sin6;
2778
2779	/*
2780	 * Save original sockaddr_in6 addr and convert it
2781	 * to sockaddr_in.
2782	 */
2783	sin6 = *(struct sockaddr_in6 *)nam;
2784	sin_p = (struct sockaddr_in *)nam;
2785	in6_sin6_2_sin(sin_p, &sin6);
2786}
2787
2788/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2789void
2790in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2791{
2792	struct sockaddr_in *sin_p;
2793	struct sockaddr_in6 *sin6_p;
2794
2795	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2796	sin_p = (struct sockaddr_in *)*nam;
2797	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2798	free(*nam, M_SONAME);
2799	*nam = (struct sockaddr *)sin6_p;
2800}
2801