in6.c revision 0e9bbe2171861777034762b3a900c9e3222374a7
1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	$KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1991, 1993
34 *	The Regents of the University of California.  All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 *	@(#)in.c	8.2 (Berkeley) 11/15/93
61 */
62
63#include <sys/cdefs.h>
64__FBSDID("$FreeBSD$");
65
66#include "opt_compat.h"
67#include "opt_inet.h"
68#include "opt_inet6.h"
69
70#include <sys/param.h>
71#include <sys/eventhandler.h>
72#include <sys/errno.h>
73#include <sys/jail.h>
74#include <sys/malloc.h>
75#include <sys/socket.h>
76#include <sys/socketvar.h>
77#include <sys/sockio.h>
78#include <sys/systm.h>
79#include <sys/priv.h>
80#include <sys/proc.h>
81#include <sys/time.h>
82#include <sys/kernel.h>
83#include <sys/lock.h>
84#include <sys/rmlock.h>
85#include <sys/syslog.h>
86
87#include <net/if.h>
88#include <net/if_var.h>
89#include <net/if_types.h>
90#include <net/route.h>
91#include <net/if_dl.h>
92#include <net/vnet.h>
93
94#include <netinet/in.h>
95#include <netinet/in_var.h>
96#include <net/if_llatbl.h>
97#include <netinet/if_ether.h>
98#include <netinet/in_systm.h>
99#include <netinet/ip.h>
100#include <netinet/in_pcb.h>
101#include <netinet/ip_carp.h>
102
103#include <netinet/ip6.h>
104#include <netinet6/ip6_var.h>
105#include <netinet6/nd6.h>
106#include <netinet6/mld6_var.h>
107#include <netinet6/ip6_mroute.h>
108#include <netinet6/in6_ifattach.h>
109#include <netinet6/scope6_var.h>
110#include <netinet6/in6_fib.h>
111#include <netinet6/in6_pcb.h>
112
113VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix);
114#define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
115
116/*
117 * Definitions of some costant IP6 addresses.
118 */
119const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
120const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
121const struct in6_addr in6addr_nodelocal_allnodes =
122	IN6ADDR_NODELOCAL_ALLNODES_INIT;
123const struct in6_addr in6addr_linklocal_allnodes =
124	IN6ADDR_LINKLOCAL_ALLNODES_INIT;
125const struct in6_addr in6addr_linklocal_allrouters =
126	IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
127const struct in6_addr in6addr_linklocal_allv2routers =
128	IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
129
130const struct in6_addr in6mask0 = IN6MASK0;
131const struct in6_addr in6mask32 = IN6MASK32;
132const struct in6_addr in6mask64 = IN6MASK64;
133const struct in6_addr in6mask96 = IN6MASK96;
134const struct in6_addr in6mask128 = IN6MASK128;
135
136const struct sockaddr_in6 sa6_any =
137	{ sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
138
139static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
140	struct in6_aliasreq *, int);
141static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
142
143static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
144    struct in6_ifaddr *, int);
145static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
146    struct in6_aliasreq *, int flags);
147static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
148    struct in6_ifaddr *, int, int);
149static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
150    struct in6_ifaddr *, int);
151
152#define ifa2ia6(ifa)	((struct in6_ifaddr *)(ifa))
153#define ia62ifa(ia6)	(&((ia6)->ia_ifa))
154
155
156void
157in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
158{
159	struct sockaddr_dl gateway;
160	struct sockaddr_in6 mask, addr;
161	struct rtentry rt;
162
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
170	bzero(&rt, sizeof(rt));
171	rt.rt_gateway = (struct sockaddr *)&gateway;
172	memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
173	memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
174	rt_mask(&rt) = (struct sockaddr *)&mask;
175	rt_key(&rt) = (struct sockaddr *)&addr;
176	rt.rt_flags = RTF_HOST | RTF_STATIC;
177	if (cmd == RTM_ADD)
178		rt.rt_flags |= RTF_UP;
179	/* Announce arrival of local address to all FIBs. */
180	rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt);
181}
182
183int
184in6_mask2len(struct in6_addr *mask, u_char *lim0)
185{
186	int x = 0, y;
187	u_char *lim = lim0, *p;
188
189	/* ignore the scope_id part */
190	if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
191		lim = (u_char *)mask + sizeof(*mask);
192	for (p = (u_char *)mask; p < lim; x++, p++) {
193		if (*p != 0xff)
194			break;
195	}
196	y = 0;
197	if (p < lim) {
198		for (y = 0; y < 8; y++) {
199			if ((*p & (0x80 >> y)) == 0)
200				break;
201		}
202	}
203
204	/*
205	 * when the limit pointer is given, do a stricter check on the
206	 * remaining bits.
207	 */
208	if (p < lim) {
209		if (y != 0 && (*p & (0x00ff >> y)) != 0)
210			return (-1);
211		for (p = p + 1; p < lim; p++)
212			if (*p != 0)
213				return (-1);
214	}
215
216	return x * 8 + y;
217}
218
219#ifdef COMPAT_FREEBSD32
220struct in6_ndifreq32 {
221	char ifname[IFNAMSIZ];
222	uint32_t ifindex;
223};
224#define	SIOCGDEFIFACE32_IN6	_IOWR('i', 86, struct in6_ndifreq32)
225#endif
226
227int
228in6_control(struct socket *so, u_long cmd, caddr_t data,
229    struct ifnet *ifp, struct thread *td)
230{
231	struct	in6_ifreq *ifr = (struct in6_ifreq *)data;
232	struct	in6_ifaddr *ia = NULL;
233	struct	in6_aliasreq *ifra = (struct in6_aliasreq *)data;
234	struct sockaddr_in6 *sa6;
235	int carp_attached = 0;
236	int error;
237	u_long ocmd = cmd;
238
239	/*
240	 * Compat to make pre-10.x ifconfig(8) operable.
241	 */
242	if (cmd == OSIOCAIFADDR_IN6)
243		cmd = SIOCAIFADDR_IN6;
244
245	switch (cmd) {
246	case SIOCGETSGCNT_IN6:
247	case SIOCGETMIFCNT_IN6:
248		/*
249		 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
250		 * We cannot see how that would be needed, so do not adjust the
251		 * KPI blindly; more likely should clean up the IPv4 variant.
252		 */
253		return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
254	}
255
256	switch (cmd) {
257	case SIOCAADDRCTL_POLICY:
258	case SIOCDADDRCTL_POLICY:
259		if (td != NULL) {
260			error = priv_check(td, PRIV_NETINET_ADDRCTRL6);
261			if (error)
262				return (error);
263		}
264		return (in6_src_ioctl(cmd, data));
265	}
266
267	if (ifp == NULL)
268		return (EOPNOTSUPP);
269
270	switch (cmd) {
271	case SIOCSNDFLUSH_IN6:
272	case SIOCSPFXFLUSH_IN6:
273	case SIOCSRTRFLUSH_IN6:
274	case SIOCSDEFIFACE_IN6:
275	case SIOCSIFINFO_FLAGS:
276	case SIOCSIFINFO_IN6:
277		if (td != NULL) {
278			error = priv_check(td, PRIV_NETINET_ND6);
279			if (error)
280				return (error);
281		}
282		/* FALLTHROUGH */
283	case OSIOCGIFINFO_IN6:
284	case SIOCGIFINFO_IN6:
285	case SIOCGNBRINFO_IN6:
286	case SIOCGDEFIFACE_IN6:
287		return (nd6_ioctl(cmd, data, ifp));
288
289#ifdef COMPAT_FREEBSD32
290	case SIOCGDEFIFACE32_IN6:
291		{
292			struct in6_ndifreq ndif;
293			struct in6_ndifreq32 *ndif32;
294
295			error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
296			    ifp);
297			if (error)
298				return (error);
299			ndif32 = (struct in6_ndifreq32 *)data;
300			ndif32->ifindex = ndif.ifindex;
301			return (0);
302		}
303#endif
304	}
305
306	switch (cmd) {
307	case SIOCSIFPREFIX_IN6:
308	case SIOCDIFPREFIX_IN6:
309	case SIOCAIFPREFIX_IN6:
310	case SIOCCIFPREFIX_IN6:
311	case SIOCSGIFPREFIX_IN6:
312	case SIOCGIFPREFIX_IN6:
313		log(LOG_NOTICE,
314		    "prefix ioctls are now invalidated. "
315		    "please use ifconfig.\n");
316		return (EOPNOTSUPP);
317	}
318
319	switch (cmd) {
320	case SIOCSSCOPE6:
321		if (td != NULL) {
322			error = priv_check(td, PRIV_NETINET_SCOPE6);
323			if (error)
324				return (error);
325		}
326		/* FALLTHROUGH */
327	case SIOCGSCOPE6:
328	case SIOCGSCOPE6DEF:
329		return (scope6_ioctl(cmd, data, ifp));
330	}
331
332	/*
333	 * Find address for this interface, if it exists.
334	 *
335	 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
336	 * only, and used the first interface address as the target of other
337	 * operations (without checking ifra_addr).  This was because netinet
338	 * code/API assumed at most 1 interface address per interface.
339	 * Since IPv6 allows a node to assign multiple addresses
340	 * on a single interface, we almost always look and check the
341	 * presence of ifra_addr, and reject invalid ones here.
342	 * It also decreases duplicated code among SIOC*_IN6 operations.
343	 */
344	switch (cmd) {
345	case SIOCAIFADDR_IN6:
346	case SIOCSIFPHYADDR_IN6:
347		sa6 = &ifra->ifra_addr;
348		break;
349	case SIOCSIFADDR_IN6:
350	case SIOCGIFADDR_IN6:
351	case SIOCSIFDSTADDR_IN6:
352	case SIOCSIFNETMASK_IN6:
353	case SIOCGIFDSTADDR_IN6:
354	case SIOCGIFNETMASK_IN6:
355	case SIOCDIFADDR_IN6:
356	case SIOCGIFPSRCADDR_IN6:
357	case SIOCGIFPDSTADDR_IN6:
358	case SIOCGIFAFLAG_IN6:
359	case SIOCSNDFLUSH_IN6:
360	case SIOCSPFXFLUSH_IN6:
361	case SIOCSRTRFLUSH_IN6:
362	case SIOCGIFALIFETIME_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
463	switch (cmd) {
464	case SIOCGIFADDR_IN6:
465		ifr->ifr_addr = ia->ia_addr;
466		if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
467			goto out;
468		break;
469
470	case SIOCGIFDSTADDR_IN6:
471		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
472			error = EINVAL;
473			goto out;
474		}
475		/*
476		 * XXX: should we check if ifa_dstaddr is NULL and return
477		 * an error?
478		 */
479		ifr->ifr_dstaddr = ia->ia_dstaddr;
480		if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
481			goto out;
482		break;
483
484	case SIOCGIFNETMASK_IN6:
485		ifr->ifr_addr = ia->ia_prefixmask;
486		break;
487
488	case SIOCGIFAFLAG_IN6:
489		ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
490		break;
491
492	case SIOCGIFSTAT_IN6:
493		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
494		    ifp->if_afdata[AF_INET6])->in6_ifstat,
495		    &ifr->ifr_ifru.ifru_stat,
496		    sizeof(struct in6_ifstat) / sizeof(uint64_t));
497		break;
498
499	case SIOCGIFSTAT_ICMP6:
500		COUNTER_ARRAY_COPY(((struct in6_ifextra *)
501		    ifp->if_afdata[AF_INET6])->icmp6_ifstat,
502		    &ifr->ifr_ifru.ifru_icmp6stat,
503		    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
504		break;
505
506	case SIOCGIFALIFETIME_IN6:
507		ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
508		if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
509			time_t maxexpire;
510			struct in6_addrlifetime *retlt =
511			    &ifr->ifr_ifru.ifru_lifetime;
512
513			/*
514			 * XXX: adjust expiration time assuming time_t is
515			 * signed.
516			 */
517			maxexpire = (-1) &
518			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
519			if (ia->ia6_lifetime.ia6t_vltime <
520			    maxexpire - ia->ia6_updatetime) {
521				retlt->ia6t_expire = ia->ia6_updatetime +
522				    ia->ia6_lifetime.ia6t_vltime;
523			} else
524				retlt->ia6t_expire = maxexpire;
525		}
526		if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
527			time_t maxexpire;
528			struct in6_addrlifetime *retlt =
529			    &ifr->ifr_ifru.ifru_lifetime;
530
531			/*
532			 * XXX: adjust expiration time assuming time_t is
533			 * signed.
534			 */
535			maxexpire = (-1) &
536			    ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
537			if (ia->ia6_lifetime.ia6t_pltime <
538			    maxexpire - ia->ia6_updatetime) {
539				retlt->ia6t_preferred = ia->ia6_updatetime +
540				    ia->ia6_lifetime.ia6t_pltime;
541			} else
542				retlt->ia6t_preferred = maxexpire;
543		}
544		break;
545
546	case SIOCAIFADDR_IN6:
547	{
548		struct nd_prefixctl pr0;
549		struct nd_prefix *pr;
550
551		/*
552		 * first, make or update the interface address structure,
553		 * and link it to the list.
554		 */
555		if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
556			goto out;
557		if (ia != NULL)
558			ifa_free(&ia->ia_ifa);
559		if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
560		    == NULL) {
561			/*
562			 * this can happen when the user specify the 0 valid
563			 * lifetime.
564			 */
565			break;
566		}
567
568		if (cmd == ocmd && ifra->ifra_vhid > 0) {
569			if (carp_attach_p != NULL)
570				error = (*carp_attach_p)(&ia->ia_ifa,
571				    ifra->ifra_vhid);
572			else
573				error = EPROTONOSUPPORT;
574			if (error)
575				goto out;
576			else
577				carp_attached = 1;
578		}
579
580		/*
581		 * then, make the prefix on-link on the interface.
582		 * XXX: we'd rather create the prefix before the address, but
583		 * we need at least one address to install the corresponding
584		 * interface route, so we configure the address first.
585		 */
586
587		/*
588		 * convert mask to prefix length (prefixmask has already
589		 * been validated in in6_update_ifa().
590		 */
591		bzero(&pr0, sizeof(pr0));
592		pr0.ndpr_ifp = ifp;
593		pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
594		    NULL);
595		if (pr0.ndpr_plen == 128) {
596			/* we don't need to install a host route. */
597			goto aifaddr_out;
598		}
599		pr0.ndpr_prefix = ifra->ifra_addr;
600		/* apply the mask for safety. */
601		IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
602		    &ifra->ifra_prefixmask.sin6_addr);
603
604		/*
605		 * XXX: since we don't have an API to set prefix (not address)
606		 * lifetimes, we just use the same lifetimes as addresses.
607		 * The (temporarily) installed lifetimes can be overridden by
608		 * later advertised RAs (when accept_rtadv is non 0), which is
609		 * an intended behavior.
610		 */
611		pr0.ndpr_raf_onlink = 1; /* should be configurable? */
612		pr0.ndpr_raf_auto =
613		    ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
614		pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
615		pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
616
617		/* add the prefix if not yet. */
618		if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
619			/*
620			 * nd6_prelist_add will install the corresponding
621			 * interface route.
622			 */
623			if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
624				if (carp_attached)
625					(*carp_detach_p)(&ia->ia_ifa);
626				goto out;
627			}
628		}
629
630		/* relate the address to the prefix */
631		if (ia->ia6_ndpr == NULL) {
632			ia->ia6_ndpr = pr;
633			pr->ndpr_addrcnt++;
634
635			/*
636			 * If this is the first autoconf address from the
637			 * prefix, create a temporary address as well
638			 * (when required).
639			 */
640			if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
641			    V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
642				int e;
643				if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
644					log(LOG_NOTICE, "in6_control: failed "
645					    "to create a temporary address, "
646					    "errno=%d\n", e);
647				}
648			}
649		}
650		nd6_prefix_rele(pr);
651
652		/*
653		 * this might affect the status of autoconfigured addresses,
654		 * that is, this address might make other addresses detached.
655		 */
656		pfxlist_onlink_check();
657
658aifaddr_out:
659		/*
660		 * Try to clear the flag when a new IPv6 address is added
661		 * onto an IFDISABLED interface and it succeeds.
662		 */
663		if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
664			struct in6_ndireq nd;
665
666			memset(&nd, 0, sizeof(nd));
667			nd.ndi.flags = ND_IFINFO(ifp)->flags;
668			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
669			if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
670				log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
671				    "SIOCSIFINFO_FLAGS for -ifdisabled "
672				    "failed.");
673			/*
674			 * Ignore failure of clearing the flag intentionally.
675			 * The failure means address duplication was detected.
676			 */
677		}
678		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
679		break;
680	}
681
682	case SIOCDIFADDR_IN6:
683	{
684		struct nd_prefix *pr;
685
686		/*
687		 * If the address being deleted is the only one that owns
688		 * the corresponding prefix, expire the prefix as well.
689		 * XXX: theoretically, we don't have to worry about such
690		 * relationship, since we separate the address management
691		 * and the prefix management.  We do this, however, to provide
692		 * as much backward compatibility as possible in terms of
693		 * the ioctl operation.
694		 * Note that in6_purgeaddr() will decrement ndpr_addrcnt.
695		 */
696		pr = ia->ia6_ndpr;
697		in6_purgeaddr(&ia->ia_ifa);
698		if (pr != NULL && pr->ndpr_addrcnt == 0) {
699			ND6_WLOCK();
700			nd6_prefix_unlink(pr, NULL);
701			ND6_WUNLOCK();
702			nd6_prefix_del(pr);
703		}
704		EVENTHANDLER_INVOKE(ifaddr_event, ifp);
705		break;
706	}
707
708	default:
709		if (ifp->if_ioctl == NULL) {
710			error = EOPNOTSUPP;
711			goto out;
712		}
713		error = (*ifp->if_ioctl)(ifp, cmd, data);
714		goto out;
715	}
716
717	error = 0;
718out:
719	if (ia != NULL)
720		ifa_free(&ia->ia_ifa);
721	return (error);
722}
723
724
725/*
726 * Join necessary multicast groups.  Factored out from in6_update_ifa().
727 * This entire work should only be done once, for the default FIB.
728 */
729static int
730in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
731    struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
732{
733	char ip6buf[INET6_ADDRSTRLEN];
734	struct in6_addr mltaddr;
735	struct in6_multi_mship *imm;
736	int delay, error;
737
738	KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
739
740	/* Join solicited multicast addr for new host id. */
741	bzero(&mltaddr, sizeof(struct in6_addr));
742	mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL;
743	mltaddr.s6_addr32[2] = htonl(1);
744	mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3];
745	mltaddr.s6_addr8[12] = 0xff;
746	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) {
747		/* XXX: should not happen */
748		log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
749		goto cleanup;
750	}
751	delay = error = 0;
752	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
753		/*
754		 * We need a random delay for DAD on the address being
755		 * configured.  It also means delaying transmission of the
756		 * corresponding MLD report to avoid report collision.
757		 * [RFC 4861, Section 6.3.7]
758		 */
759		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
760	}
761	imm = in6_joingroup(ifp, &mltaddr, &error, delay);
762	if (imm == NULL) {
763		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
764		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
765		    if_name(ifp), error));
766		goto cleanup;
767	}
768	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
769	*in6m_sol = imm->i6mm_maddr;
770
771	/*
772	 * Join link-local all-nodes address.
773	 */
774	mltaddr = in6addr_linklocal_allnodes;
775	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
776		goto cleanup; /* XXX: should not fail */
777
778	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
779	if (imm == NULL) {
780		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
781		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
782		    if_name(ifp), error));
783		goto cleanup;
784	}
785	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
786
787	/*
788	 * Join node information group address.
789	 */
790	delay = 0;
791	if ((flags & IN6_IFAUPDATE_DADDELAY)) {
792		/*
793		 * The spec does not say anything about delay for this group,
794		 * but the same logic should apply.
795		 */
796		delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
797	}
798	if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
799		/* XXX jinmei */
800		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
801		if (imm == NULL)
802			nd6log((LOG_WARNING,
803			    "%s: in6_joingroup failed for %s on %s "
804			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
805			    &mltaddr), if_name(ifp), error));
806			/* XXX not very fatal, go on... */
807		else
808			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
809	}
810	if (V_icmp6_nodeinfo_oldmcprefix &&
811	    in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
812		imm = in6_joingroup(ifp, &mltaddr, &error, delay);
813		if (imm == NULL)
814			nd6log((LOG_WARNING,
815			    "%s: in6_joingroup failed for %s on %s "
816			    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
817			    &mltaddr), if_name(ifp), error));
818			/* XXX not very fatal, go on... */
819		else
820			LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
821	}
822
823	/*
824	 * Join interface-local all-nodes address.
825	 * (ff01::1%ifN, and ff01::%ifN/32)
826	 */
827	mltaddr = in6addr_nodelocal_allnodes;
828	if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
829		goto cleanup; /* XXX: should not fail */
830
831	imm = in6_joingroup(ifp, &mltaddr, &error, 0);
832	if (imm == NULL) {
833		nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
834		    "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
835		    &mltaddr), if_name(ifp), error));
836		goto cleanup;
837	}
838	LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
839
840cleanup:
841	return (error);
842}
843
844/*
845 * Update parameters of an IPv6 interface address.
846 * If necessary, a new entry is created and linked into address chains.
847 * This function is separated from in6_control().
848 */
849int
850in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
851    struct in6_ifaddr *ia, int flags)
852{
853	int error, hostIsNew = 0;
854
855	if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
856		return (error);
857
858	if (ia == NULL) {
859		hostIsNew = 1;
860		if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
861			return (ENOBUFS);
862	}
863
864	error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
865	if (error != 0) {
866		if (hostIsNew != 0) {
867			in6_unlink_ifa(ia, ifp);
868			ifa_free(&ia->ia_ifa);
869		}
870		return (error);
871	}
872
873	if (hostIsNew)
874		error = in6_broadcast_ifa(ifp, ifra, ia, flags);
875
876	return (error);
877}
878
879/*
880 * Fill in basic IPv6 address request info.
881 */
882void
883in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
884    const struct in6_addr *mask)
885{
886
887	memset(ifra, 0, sizeof(struct in6_aliasreq));
888
889	ifra->ifra_addr.sin6_family = AF_INET6;
890	ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
891	if (addr != NULL)
892		ifra->ifra_addr.sin6_addr = *addr;
893
894	ifra->ifra_prefixmask.sin6_family = AF_INET6;
895	ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
896	if (mask != NULL)
897		ifra->ifra_prefixmask.sin6_addr = *mask;
898}
899
900static int
901in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
902    struct in6_ifaddr *ia, int flags)
903{
904	int plen = -1;
905	struct sockaddr_in6 dst6;
906	struct in6_addrlifetime *lt;
907	char ip6buf[INET6_ADDRSTRLEN];
908
909	/* Validate parameters */
910	if (ifp == NULL || ifra == NULL) /* this maybe redundant */
911		return (EINVAL);
912
913	/*
914	 * The destination address for a p2p link must have a family
915	 * of AF_UNSPEC or AF_INET6.
916	 */
917	if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
918	    ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
919	    ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
920		return (EAFNOSUPPORT);
921
922	/*
923	 * Validate address
924	 */
925	if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
926	    ifra->ifra_addr.sin6_family != AF_INET6)
927		return (EINVAL);
928
929	/*
930	 * validate ifra_prefixmask.  don't check sin6_family, netmask
931	 * does not carry fields other than sin6_len.
932	 */
933	if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
934		return (EINVAL);
935	/*
936	 * Because the IPv6 address architecture is classless, we require
937	 * users to specify a (non 0) prefix length (mask) for a new address.
938	 * We also require the prefix (when specified) mask is valid, and thus
939	 * reject a non-consecutive mask.
940	 */
941	if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
942		return (EINVAL);
943	if (ifra->ifra_prefixmask.sin6_len != 0) {
944		plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
945		    (u_char *)&ifra->ifra_prefixmask +
946		    ifra->ifra_prefixmask.sin6_len);
947		if (plen <= 0)
948			return (EINVAL);
949	} else {
950		/*
951		 * In this case, ia must not be NULL.  We just use its prefix
952		 * length.
953		 */
954		plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
955	}
956	/*
957	 * If the destination address on a p2p interface is specified,
958	 * and the address is a scoped one, validate/set the scope
959	 * zone identifier.
960	 */
961	dst6 = ifra->ifra_dstaddr;
962	if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
963	    (dst6.sin6_family == AF_INET6)) {
964		struct in6_addr in6_tmp;
965		u_int32_t zoneid;
966
967		in6_tmp = dst6.sin6_addr;
968		if (in6_setscope(&in6_tmp, ifp, &zoneid))
969			return (EINVAL); /* XXX: should be impossible */
970
971		if (dst6.sin6_scope_id != 0) {
972			if (dst6.sin6_scope_id != zoneid)
973				return (EINVAL);
974		} else		/* user omit to specify the ID. */
975			dst6.sin6_scope_id = zoneid;
976
977		/* convert into the internal form */
978		if (sa6_embedscope(&dst6, 0))
979			return (EINVAL); /* XXX: should be impossible */
980	}
981	/* Modify original ifra_dstaddr to reflect changes */
982	ifra->ifra_dstaddr = dst6;
983
984	/*
985	 * The destination address can be specified only for a p2p or a
986	 * loopback interface.  If specified, the corresponding prefix length
987	 * must be 128.
988	 */
989	if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
990		if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
991			/* XXX: noisy message */
992			nd6log((LOG_INFO, "in6_update_ifa: a destination can "
993			    "be specified for a p2p or a loopback IF only\n"));
994			return (EINVAL);
995		}
996		if (plen != 128) {
997			nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
998			    "be 128 when dstaddr is specified\n"));
999			return (EINVAL);
1000		}
1001	}
1002	/* lifetime consistency check */
1003	lt = &ifra->ifra_lifetime;
1004	if (lt->ia6t_pltime > lt->ia6t_vltime)
1005		return (EINVAL);
1006	if (lt->ia6t_vltime == 0) {
1007		/*
1008		 * the following log might be noisy, but this is a typical
1009		 * configuration mistake or a tool's bug.
1010		 */
1011		nd6log((LOG_INFO,
1012		    "in6_update_ifa: valid lifetime is 0 for %s\n",
1013		    ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
1014
1015		if (ia == NULL)
1016			return (0); /* there's nothing to do */
1017	}
1018
1019	/* Check prefix mask */
1020	if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
1021		/*
1022		 * We prohibit changing the prefix length of an existing
1023		 * address, because
1024		 * + such an operation should be rare in IPv6, and
1025		 * + the operation would confuse prefix management.
1026		 */
1027		if (ia->ia_prefixmask.sin6_len != 0 &&
1028		    in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1029			nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
1030			    "of an existing %s address should not be changed\n",
1031			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1032
1033			return (EINVAL);
1034		}
1035	}
1036
1037	return (0);
1038}
1039
1040
1041/*
1042 * Allocate a new ifaddr and link it into chains.
1043 */
1044static struct in6_ifaddr *
1045in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
1046{
1047	struct in6_ifaddr *ia;
1048
1049	/*
1050	 * When in6_alloc_ifa() is called in a process of a received
1051	 * RA, it is called under an interrupt context.  So, we should
1052	 * call malloc with M_NOWAIT.
1053	 */
1054	ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
1055	if (ia == NULL)
1056		return (NULL);
1057	LIST_INIT(&ia->ia6_memberships);
1058	/* Initialize the address and masks, and put time stamp */
1059	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1060	ia->ia_addr.sin6_family = AF_INET6;
1061	ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1062	/* XXX: Can we assign ,sin6_addr and skip the rest? */
1063	ia->ia_addr = ifra->ifra_addr;
1064	ia->ia6_createtime = time_uptime;
1065	if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1066		/*
1067		 * Some functions expect that ifa_dstaddr is not
1068		 * NULL for p2p interfaces.
1069		 */
1070		ia->ia_ifa.ifa_dstaddr =
1071		    (struct sockaddr *)&ia->ia_dstaddr;
1072	} else {
1073		ia->ia_ifa.ifa_dstaddr = NULL;
1074	}
1075
1076	/* set prefix mask if any */
1077	ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1078	if (ifra->ifra_prefixmask.sin6_len != 0) {
1079		ia->ia_prefixmask.sin6_family = AF_INET6;
1080		ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1081		ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1082	}
1083
1084	ia->ia_ifp = ifp;
1085	ifa_ref(&ia->ia_ifa);			/* if_addrhead */
1086	IF_ADDR_WLOCK(ifp);
1087	TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1088	IF_ADDR_WUNLOCK(ifp);
1089
1090	ifa_ref(&ia->ia_ifa);			/* in6_ifaddrhead */
1091	IN6_IFADDR_WLOCK();
1092	TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1093	LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1094	IN6_IFADDR_WUNLOCK();
1095
1096	return (ia);
1097}
1098
1099/*
1100 * Update/configure interface address parameters:
1101 *
1102 * 1) Update lifetime
1103 * 2) Update interface metric ad flags
1104 * 3) Notify other subsystems
1105 */
1106static int
1107in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1108    struct in6_ifaddr *ia, int hostIsNew, int flags)
1109{
1110	int error;
1111
1112	/* update timestamp */
1113	ia->ia6_updatetime = time_uptime;
1114
1115	/*
1116	 * Set lifetimes.  We do not refer to ia6t_expire and ia6t_preferred
1117	 * to see if the address is deprecated or invalidated, but initialize
1118	 * these members for applications.
1119	 */
1120	ia->ia6_lifetime = ifra->ifra_lifetime;
1121	if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1122		ia->ia6_lifetime.ia6t_expire =
1123		    time_uptime + ia->ia6_lifetime.ia6t_vltime;
1124	} else
1125		ia->ia6_lifetime.ia6t_expire = 0;
1126	if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1127		ia->ia6_lifetime.ia6t_preferred =
1128		    time_uptime + ia->ia6_lifetime.ia6t_pltime;
1129	} else
1130		ia->ia6_lifetime.ia6t_preferred = 0;
1131
1132	/*
1133	 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1134	 * userland, make it deprecated.
1135	 */
1136	if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1137		ia->ia6_lifetime.ia6t_pltime = 0;
1138		ia->ia6_lifetime.ia6t_preferred = time_uptime;
1139	}
1140
1141	/*
1142	 * configure address flags.
1143	 */
1144	ia->ia6_flags = ifra->ifra_flags;
1145
1146	/*
1147	 * Make the address tentative before joining multicast addresses,
1148	 * so that corresponding MLD responses would not have a tentative
1149	 * source address.
1150	 */
1151	ia->ia6_flags &= ~IN6_IFF_DUPLICATED;	/* safety */
1152
1153	/*
1154	 * DAD should be performed for an new address or addresses on
1155	 * an interface with ND6_IFF_IFDISABLED.
1156	 */
1157	if (in6if_do_dad(ifp) &&
1158	    (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1159		ia->ia6_flags |= IN6_IFF_TENTATIVE;
1160
1161	/* notify other subsystems */
1162	error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1163
1164	return (error);
1165}
1166
1167/*
1168 * Do link-level ifa job:
1169 * 1) Add lle entry for added address
1170 * 2) Notifies routing socket users about new address
1171 * 3) join appropriate multicast group
1172 * 4) start DAD if enabled
1173 */
1174static int
1175in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1176    struct in6_ifaddr *ia, int flags)
1177{
1178	struct in6_multi *in6m_sol;
1179	int error = 0;
1180
1181	/* Add local address to lltable, if necessary (ex. on p2p link). */
1182	if ((error = nd6_add_ifa_lle(ia)) != 0) {
1183		in6_purgeaddr(&ia->ia_ifa);
1184		ifa_free(&ia->ia_ifa);
1185		return (error);
1186	}
1187
1188	/* Join necessary multicast groups. */
1189	in6m_sol = NULL;
1190	if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1191		error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1192		if (error != 0) {
1193			in6_purgeaddr(&ia->ia_ifa);
1194			ifa_free(&ia->ia_ifa);
1195			return (error);
1196		}
1197	}
1198
1199	/* Perform DAD, if the address is TENTATIVE. */
1200	if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1201		int delay, mindelay, maxdelay;
1202
1203		delay = 0;
1204		if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1205			/*
1206			 * We need to impose a delay before sending an NS
1207			 * for DAD.  Check if we also needed a delay for the
1208			 * corresponding MLD message.  If we did, the delay
1209			 * should be larger than the MLD delay (this could be
1210			 * relaxed a bit, but this simple logic is at least
1211			 * safe).
1212			 * XXX: Break data hiding guidelines and look at
1213			 * state for the solicited multicast group.
1214			 */
1215			mindelay = 0;
1216			if (in6m_sol != NULL &&
1217			    in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1218				mindelay = in6m_sol->in6m_timer;
1219			}
1220			maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1221			if (maxdelay - mindelay == 0)
1222				delay = 0;
1223			else {
1224				delay =
1225				    (arc4random() % (maxdelay - mindelay)) +
1226				    mindelay;
1227			}
1228		}
1229		nd6_dad_start((struct ifaddr *)ia, delay);
1230	}
1231
1232	in6_newaddrmsg(ia, RTM_ADD);
1233	ifa_free(&ia->ia_ifa);
1234	return (error);
1235}
1236
1237void
1238in6_purgeaddr(struct ifaddr *ifa)
1239{
1240	struct ifnet *ifp = ifa->ifa_ifp;
1241	struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1242	struct in6_multi_mship *imm;
1243	int plen, error;
1244
1245	if (ifa->ifa_carp)
1246		(*carp_detach_p)(ifa);
1247
1248	/*
1249	 * Remove the loopback route to the interface address.
1250	 * The check for the current setting of "nd6_useloopback"
1251	 * is not needed.
1252	 */
1253	if (ia->ia_flags & IFA_RTSELF) {
1254		error = ifa_del_loopback_route((struct ifaddr *)ia,
1255		    (struct sockaddr *)&ia->ia_addr);
1256		if (error == 0)
1257			ia->ia_flags &= ~IFA_RTSELF;
1258	}
1259
1260	/* stop DAD processing */
1261	nd6_dad_stop(ifa);
1262
1263	/* Leave multicast groups. */
1264	while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1265		LIST_REMOVE(imm, i6mm_chain);
1266		in6_leavegroup(imm);
1267	}
1268	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1269	if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
1270		error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags |
1271		    (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0));
1272		if (error != 0)
1273			log(LOG_INFO, "%s: err=%d, destination address delete "
1274			    "failed\n", __func__, error);
1275		ia->ia_flags &= ~IFA_ROUTE;
1276	}
1277
1278	in6_newaddrmsg(ia, RTM_DELETE);
1279	in6_unlink_ifa(ia, ifp);
1280}
1281
1282static void
1283in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1284{
1285	char ip6buf[INET6_ADDRSTRLEN];
1286	int remove_lle;
1287
1288	IF_ADDR_WLOCK(ifp);
1289	TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1290	IF_ADDR_WUNLOCK(ifp);
1291	ifa_free(&ia->ia_ifa);			/* if_addrhead */
1292
1293	/*
1294	 * Defer the release of what might be the last reference to the
1295	 * in6_ifaddr so that it can't be freed before the remainder of the
1296	 * cleanup.
1297	 */
1298	IN6_IFADDR_WLOCK();
1299	TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
1300	LIST_REMOVE(ia, ia6_hash);
1301	IN6_IFADDR_WUNLOCK();
1302
1303	/*
1304	 * Release the reference to the base prefix.  There should be a
1305	 * positive reference.
1306	 */
1307	remove_lle = 0;
1308	if (ia->ia6_ndpr == NULL) {
1309		nd6log((LOG_NOTICE,
1310		    "in6_unlink_ifa: autoconf'ed address "
1311		    "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1312	} else {
1313		ia->ia6_ndpr->ndpr_addrcnt--;
1314		/* Do not delete lles within prefix if refcont != 0 */
1315		if (ia->ia6_ndpr->ndpr_addrcnt == 0)
1316			remove_lle = 1;
1317		ia->ia6_ndpr = NULL;
1318	}
1319
1320	nd6_rem_ifa_lle(ia, remove_lle);
1321
1322	/*
1323	 * Also, if the address being removed is autoconf'ed, call
1324	 * pfxlist_onlink_check() since the release might affect the status of
1325	 * other (detached) addresses.
1326	 */
1327	if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1328		pfxlist_onlink_check();
1329	}
1330	ifa_free(&ia->ia_ifa);			/* in6_ifaddrhead */
1331}
1332
1333/*
1334 * Notifies other subsystems about address change/arrival:
1335 * 1) Notifies device handler on the first IPv6 address assignment
1336 * 2) Handle routing table changes for P2P links and route
1337 * 3) Handle routing table changes for address host route
1338 */
1339static int
1340in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1341    struct in6_aliasreq *ifra, int hostIsNew)
1342{
1343	int	error = 0, plen, ifacount = 0;
1344	struct ifaddr *ifa;
1345	struct sockaddr_in6 *pdst;
1346	char ip6buf[INET6_ADDRSTRLEN];
1347
1348	/*
1349	 * Give the interface a chance to initialize
1350	 * if this is its first address,
1351	 */
1352	if (hostIsNew != 0) {
1353		IF_ADDR_RLOCK(ifp);
1354		TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1355			if (ifa->ifa_addr->sa_family != AF_INET6)
1356				continue;
1357			ifacount++;
1358		}
1359		IF_ADDR_RUNLOCK(ifp);
1360	}
1361
1362	if (ifacount <= 1 && ifp->if_ioctl) {
1363		error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1364		if (error)
1365			return (error);
1366	}
1367
1368	/*
1369	 * If a new destination address is specified, scrub the old one and
1370	 * install the new destination.  Note that the interface must be
1371	 * p2p or loopback.
1372	 */
1373	pdst = &ifra->ifra_dstaddr;
1374	if (pdst->sin6_family == AF_INET6 &&
1375	    !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1376		if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1377		    (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) {
1378			nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1379			    "remove a route to the old destination: %s\n",
1380			    ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1381			/* proceed anyway... */
1382		} else
1383			ia->ia_flags &= ~IFA_ROUTE;
1384		ia->ia_dstaddr = *pdst;
1385	}
1386
1387	/*
1388	 * If a new destination address is specified for a point-to-point
1389	 * interface, install a route to the destination as an interface
1390	 * direct route.
1391	 * XXX: the logic below rejects assigning multiple addresses on a p2p
1392	 * interface that share the same destination.
1393	 */
1394	plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1395	if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
1396	    ia->ia_dstaddr.sin6_family == AF_INET6) {
1397		int rtflags = RTF_UP | RTF_HOST;
1398		/*
1399		 * Handle the case for ::1 .
1400		 */
1401		if (ifp->if_flags & IFF_LOOPBACK)
1402			ia->ia_flags |= IFA_RTSELF;
1403		error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags);
1404		if (error)
1405			return (error);
1406		ia->ia_flags |= IFA_ROUTE;
1407	}
1408
1409	/*
1410	 * add a loopback route to self if not exists
1411	 */
1412	if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1413		error = ifa_add_loopback_route((struct ifaddr *)ia,
1414		    (struct sockaddr *)&ia->ia_addr);
1415		if (error == 0)
1416			ia->ia_flags |= IFA_RTSELF;
1417	}
1418
1419	return (error);
1420}
1421
1422/*
1423 * Find an IPv6 interface link-local address specific to an interface.
1424 * ifaddr is returned referenced.
1425 */
1426struct in6_ifaddr *
1427in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1428{
1429	struct ifaddr *ifa;
1430
1431	IF_ADDR_RLOCK(ifp);
1432	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1433		if (ifa->ifa_addr->sa_family != AF_INET6)
1434			continue;
1435		if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1436			if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1437			    ignoreflags) != 0)
1438				continue;
1439			ifa_ref(ifa);
1440			break;
1441		}
1442	}
1443	IF_ADDR_RUNLOCK(ifp);
1444
1445	return ((struct in6_ifaddr *)ifa);
1446}
1447
1448
1449/*
1450 * find the internet address corresponding to a given address.
1451 * ifaddr is returned referenced.
1452 */
1453struct in6_ifaddr *
1454in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid)
1455{
1456	struct rm_priotracker in6_ifa_tracker;
1457	struct in6_ifaddr *ia;
1458
1459	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1460	LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1461		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1462			if (zoneid != 0 &&
1463			    zoneid != ia->ia_addr.sin6_scope_id)
1464				continue;
1465			ifa_ref(&ia->ia_ifa);
1466			break;
1467		}
1468	}
1469	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1470	return (ia);
1471}
1472
1473/*
1474 * find the internet address corresponding to a given interface and address.
1475 * ifaddr is returned referenced.
1476 */
1477struct in6_ifaddr *
1478in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1479{
1480	struct ifaddr *ifa;
1481
1482	IF_ADDR_RLOCK(ifp);
1483	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1484		if (ifa->ifa_addr->sa_family != AF_INET6)
1485			continue;
1486		if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1487			ifa_ref(ifa);
1488			break;
1489		}
1490	}
1491	IF_ADDR_RUNLOCK(ifp);
1492
1493	return ((struct in6_ifaddr *)ifa);
1494}
1495
1496/*
1497 * Find a link-local scoped address on ifp and return it if any.
1498 */
1499struct in6_ifaddr *
1500in6ifa_llaonifp(struct ifnet *ifp)
1501{
1502	struct sockaddr_in6 *sin6;
1503	struct ifaddr *ifa;
1504
1505	if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1506		return (NULL);
1507	IF_ADDR_RLOCK(ifp);
1508	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1509		if (ifa->ifa_addr->sa_family != AF_INET6)
1510			continue;
1511		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1512		if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1513		    IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1514		    IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1515			break;
1516	}
1517	IF_ADDR_RUNLOCK(ifp);
1518
1519	return ((struct in6_ifaddr *)ifa);
1520}
1521
1522/*
1523 * Convert IP6 address to printable (loggable) representation. Caller
1524 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1525 */
1526static char digits[] = "0123456789abcdef";
1527char *
1528ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1529{
1530	int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1531	char *cp;
1532	const u_int16_t *a = (const u_int16_t *)addr;
1533	const u_int8_t *d;
1534	int dcolon = 0, zero = 0;
1535
1536	cp = ip6buf;
1537
1538	for (i = 0; i < 8; i++) {
1539		if (*(a + i) == 0) {
1540			cnt++;
1541			if (cnt == 1)
1542				idx = i;
1543		}
1544		else if (maxcnt < cnt) {
1545			maxcnt = cnt;
1546			index = idx;
1547			cnt = 0;
1548		}
1549	}
1550	if (maxcnt < cnt) {
1551		maxcnt = cnt;
1552		index = idx;
1553	}
1554
1555	for (i = 0; i < 8; i++) {
1556		if (dcolon == 1) {
1557			if (*a == 0) {
1558				if (i == 7)
1559					*cp++ = ':';
1560				a++;
1561				continue;
1562			} else
1563				dcolon = 2;
1564		}
1565		if (*a == 0) {
1566			if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1567				if (i == 0)
1568					*cp++ = ':';
1569				*cp++ = ':';
1570				dcolon = 1;
1571			} else {
1572				*cp++ = '0';
1573				*cp++ = ':';
1574			}
1575			a++;
1576			continue;
1577		}
1578		d = (const u_char *)a;
1579		/* Try to eliminate leading zeros in printout like in :0001. */
1580		zero = 1;
1581		*cp = digits[*d >> 4];
1582		if (*cp != '0') {
1583			zero = 0;
1584			cp++;
1585		}
1586		*cp = digits[*d++ & 0xf];
1587		if (zero == 0 || (*cp != '0')) {
1588			zero = 0;
1589			cp++;
1590		}
1591		*cp = digits[*d >> 4];
1592		if (zero == 0 || (*cp != '0')) {
1593			zero = 0;
1594			cp++;
1595		}
1596		*cp++ = digits[*d & 0xf];
1597		*cp++ = ':';
1598		a++;
1599	}
1600	*--cp = '\0';
1601	return (ip6buf);
1602}
1603
1604int
1605in6_localaddr(struct in6_addr *in6)
1606{
1607	struct rm_priotracker in6_ifa_tracker;
1608	struct in6_ifaddr *ia;
1609
1610	if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1611		return 1;
1612
1613	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1614	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1615		if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1616		    &ia->ia_prefixmask.sin6_addr)) {
1617			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1618			return 1;
1619		}
1620	}
1621	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1622
1623	return (0);
1624}
1625
1626/*
1627 * Return 1 if an internet address is for the local host and configured
1628 * on one of its interfaces.
1629 */
1630int
1631in6_localip(struct in6_addr *in6)
1632{
1633	struct rm_priotracker in6_ifa_tracker;
1634	struct in6_ifaddr *ia;
1635
1636	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1637	LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1638		if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1639			IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1640			return (1);
1641		}
1642	}
1643	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1644	return (0);
1645}
1646
1647/*
1648 * Return 1 if an internet address is configured on an interface.
1649 */
1650int
1651in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1652{
1653	struct in6_addr in6;
1654	struct ifaddr *ifa;
1655	struct in6_ifaddr *ia6;
1656
1657	in6 = *addr;
1658	if (in6_clearscope(&in6))
1659		return (0);
1660	in6_setscope(&in6, ifp, NULL);
1661
1662	IF_ADDR_RLOCK(ifp);
1663	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1664		if (ifa->ifa_addr->sa_family != AF_INET6)
1665			continue;
1666		ia6 = (struct in6_ifaddr *)ifa;
1667		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
1668			IF_ADDR_RUNLOCK(ifp);
1669			return (1);
1670		}
1671	}
1672	IF_ADDR_RUNLOCK(ifp);
1673
1674	return (0);
1675}
1676
1677int
1678in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1679{
1680	struct rm_priotracker in6_ifa_tracker;
1681	struct in6_ifaddr *ia;
1682
1683	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1684	LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1685		if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1686			if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1687				IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1688				return (1); /* true */
1689			}
1690			break;
1691		}
1692	}
1693	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1694
1695	return (0);		/* false */
1696}
1697
1698/*
1699 * return length of part which dst and src are equal
1700 * hard coding...
1701 */
1702int
1703in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1704{
1705	int match = 0;
1706	u_char *s = (u_char *)src, *d = (u_char *)dst;
1707	u_char *lim = s + 16, r;
1708
1709	while (s < lim)
1710		if ((r = (*d++ ^ *s++)) != 0) {
1711			while (r < 128) {
1712				match++;
1713				r <<= 1;
1714			}
1715			break;
1716		} else
1717			match += 8;
1718	return match;
1719}
1720
1721/* XXX: to be scope conscious */
1722int
1723in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1724{
1725	int bytelen, bitlen;
1726
1727	/* sanity check */
1728	if (0 > len || len > 128) {
1729		log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1730		    len);
1731		return (0);
1732	}
1733
1734	bytelen = len / 8;
1735	bitlen = len % 8;
1736
1737	if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1738		return (0);
1739	if (bitlen != 0 &&
1740	    p1->s6_addr[bytelen] >> (8 - bitlen) !=
1741	    p2->s6_addr[bytelen] >> (8 - bitlen))
1742		return (0);
1743
1744	return (1);
1745}
1746
1747void
1748in6_prefixlen2mask(struct in6_addr *maskp, int len)
1749{
1750	u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1751	int bytelen, bitlen, i;
1752
1753	/* sanity check */
1754	if (0 > len || len > 128) {
1755		log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1756		    len);
1757		return;
1758	}
1759
1760	bzero(maskp, sizeof(*maskp));
1761	bytelen = len / 8;
1762	bitlen = len % 8;
1763	for (i = 0; i < bytelen; i++)
1764		maskp->s6_addr[i] = 0xff;
1765	if (bitlen)
1766		maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1767}
1768
1769/*
1770 * return the best address out of the same scope. if no address was
1771 * found, return the first valid address from designated IF.
1772 */
1773struct in6_ifaddr *
1774in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1775{
1776	int dst_scope =	in6_addrscope(dst), blen = -1, tlen;
1777	struct ifaddr *ifa;
1778	struct in6_ifaddr *besta = NULL;
1779	struct in6_ifaddr *dep[2];	/* last-resort: deprecated */
1780
1781	dep[0] = dep[1] = NULL;
1782
1783	/*
1784	 * We first look for addresses in the same scope.
1785	 * If there is one, return it.
1786	 * If two or more, return one which matches the dst longest.
1787	 * If none, return one of global addresses assigned other ifs.
1788	 */
1789	IF_ADDR_RLOCK(ifp);
1790	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1791		if (ifa->ifa_addr->sa_family != AF_INET6)
1792			continue;
1793		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1794			continue; /* XXX: is there any case to allow anycast? */
1795		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1796			continue; /* don't use this interface */
1797		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1798			continue;
1799		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1800			if (V_ip6_use_deprecated)
1801				dep[0] = (struct in6_ifaddr *)ifa;
1802			continue;
1803		}
1804
1805		if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
1806			/*
1807			 * call in6_matchlen() as few as possible
1808			 */
1809			if (besta) {
1810				if (blen == -1)
1811					blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
1812				tlen = in6_matchlen(IFA_IN6(ifa), dst);
1813				if (tlen > blen) {
1814					blen = tlen;
1815					besta = (struct in6_ifaddr *)ifa;
1816				}
1817			} else
1818				besta = (struct in6_ifaddr *)ifa;
1819		}
1820	}
1821	if (besta) {
1822		ifa_ref(&besta->ia_ifa);
1823		IF_ADDR_RUNLOCK(ifp);
1824		return (besta);
1825	}
1826
1827	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1828		if (ifa->ifa_addr->sa_family != AF_INET6)
1829			continue;
1830		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
1831			continue; /* XXX: is there any case to allow anycast? */
1832		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
1833			continue; /* don't use this interface */
1834		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
1835			continue;
1836		if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
1837			if (V_ip6_use_deprecated)
1838				dep[1] = (struct in6_ifaddr *)ifa;
1839			continue;
1840		}
1841
1842		if (ifa != NULL)
1843			ifa_ref(ifa);
1844		IF_ADDR_RUNLOCK(ifp);
1845		return (struct in6_ifaddr *)ifa;
1846	}
1847
1848	/* use the last-resort values, that are, deprecated addresses */
1849	if (dep[0]) {
1850		ifa_ref((struct ifaddr *)dep[0]);
1851		IF_ADDR_RUNLOCK(ifp);
1852		return dep[0];
1853	}
1854	if (dep[1]) {
1855		ifa_ref((struct ifaddr *)dep[1]);
1856		IF_ADDR_RUNLOCK(ifp);
1857		return dep[1];
1858	}
1859
1860	IF_ADDR_RUNLOCK(ifp);
1861	return NULL;
1862}
1863
1864/*
1865 * perform DAD when interface becomes IFF_UP.
1866 */
1867void
1868in6_if_up(struct ifnet *ifp)
1869{
1870	struct ifaddr *ifa;
1871	struct in6_ifaddr *ia;
1872
1873	IF_ADDR_RLOCK(ifp);
1874	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1875		if (ifa->ifa_addr->sa_family != AF_INET6)
1876			continue;
1877		ia = (struct in6_ifaddr *)ifa;
1878		if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
1879			/*
1880			 * The TENTATIVE flag was likely set by hand
1881			 * beforehand, implicitly indicating the need for DAD.
1882			 * We may be able to skip the random delay in this
1883			 * case, but we impose delays just in case.
1884			 */
1885			nd6_dad_start(ifa,
1886			    arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
1887		}
1888	}
1889	IF_ADDR_RUNLOCK(ifp);
1890
1891	/*
1892	 * special cases, like 6to4, are handled in in6_ifattach
1893	 */
1894	in6_ifattach(ifp, NULL);
1895}
1896
1897int
1898in6if_do_dad(struct ifnet *ifp)
1899{
1900	if ((ifp->if_flags & IFF_LOOPBACK) != 0)
1901		return (0);
1902
1903	if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) ||
1904	    (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD))
1905		return (0);
1906
1907	/*
1908	 * Our DAD routine requires the interface up and running.
1909	 * However, some interfaces can be up before the RUNNING
1910	 * status.  Additionally, users may try to assign addresses
1911	 * before the interface becomes up (or running).
1912	 * This function returns EAGAIN in that case.
1913	 * The caller should mark "tentative" on the address instead of
1914	 * performing DAD immediately.
1915	 */
1916	if (!((ifp->if_flags & IFF_UP) &&
1917	    (ifp->if_drv_flags & IFF_DRV_RUNNING)))
1918		return (EAGAIN);
1919
1920	return (1);
1921}
1922
1923/*
1924 * Calculate max IPv6 MTU through all the interfaces and store it
1925 * to in6_maxmtu.
1926 */
1927void
1928in6_setmaxmtu(void)
1929{
1930	unsigned long maxmtu = 0;
1931	struct ifnet *ifp;
1932
1933	IFNET_RLOCK_NOSLEEP();
1934	TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1935		/* this function can be called during ifnet initialization */
1936		if (!ifp->if_afdata[AF_INET6])
1937			continue;
1938		if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
1939		    IN6_LINKMTU(ifp) > maxmtu)
1940			maxmtu = IN6_LINKMTU(ifp);
1941	}
1942	IFNET_RUNLOCK_NOSLEEP();
1943	if (maxmtu)	/* update only when maxmtu is positive */
1944		V_in6_maxmtu = maxmtu;
1945}
1946
1947/*
1948 * Provide the length of interface identifiers to be used for the link attached
1949 * to the given interface.  The length should be defined in "IPv6 over
1950 * xxx-link" document.  Note that address architecture might also define
1951 * the length for a particular set of address prefixes, regardless of the
1952 * link type.  As clarified in rfc2462bis, those two definitions should be
1953 * consistent, and those really are as of August 2004.
1954 */
1955int
1956in6_if2idlen(struct ifnet *ifp)
1957{
1958	switch (ifp->if_type) {
1959	case IFT_ETHER:		/* RFC2464 */
1960	case IFT_PROPVIRTUAL:	/* XXX: no RFC. treat it as ether */
1961	case IFT_L2VLAN:	/* ditto */
1962	case IFT_IEEE80211:	/* ditto */
1963	case IFT_BRIDGE:	/* bridge(4) only does Ethernet-like links */
1964	case IFT_INFINIBAND:
1965		return (64);
1966	case IFT_FDDI:		/* RFC2467 */
1967		return (64);
1968	case IFT_ISO88025:	/* RFC2470 (IPv6 over Token Ring) */
1969		return (64);
1970	case IFT_PPP:		/* RFC2472 */
1971		return (64);
1972	case IFT_ARCNET:	/* RFC2497 */
1973		return (64);
1974	case IFT_FRELAY:	/* RFC2590 */
1975		return (64);
1976	case IFT_IEEE1394:	/* RFC3146 */
1977		return (64);
1978	case IFT_GIF:
1979		return (64);	/* draft-ietf-v6ops-mech-v2-07 */
1980	case IFT_LOOP:
1981		return (64);	/* XXX: is this really correct? */
1982	default:
1983		/*
1984		 * Unknown link type:
1985		 * It might be controversial to use the today's common constant
1986		 * of 64 for these cases unconditionally.  For full compliance,
1987		 * we should return an error in this case.  On the other hand,
1988		 * if we simply miss the standard for the link type or a new
1989		 * standard is defined for a new link type, the IFID length
1990		 * is very likely to be the common constant.  As a compromise,
1991		 * we always use the constant, but make an explicit notice
1992		 * indicating the "unknown" case.
1993		 */
1994		printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
1995		return (64);
1996	}
1997}
1998
1999#include <sys/sysctl.h>
2000
2001struct in6_llentry {
2002	struct llentry		base;
2003};
2004
2005#define	IN6_LLTBL_DEFAULT_HSIZE	32
2006#define	IN6_LLTBL_HASH(k, h) \
2007	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2008
2009/*
2010 * Do actual deallocation of @lle.
2011 */
2012static void
2013in6_lltable_destroy_lle_unlocked(struct llentry *lle)
2014{
2015
2016	LLE_LOCK_DESTROY(lle);
2017	LLE_REQ_DESTROY(lle);
2018	free(lle, M_LLTABLE);
2019}
2020
2021/*
2022 * Called by LLE_FREE_LOCKED when number of references
2023 * drops to zero.
2024 */
2025static void
2026in6_lltable_destroy_lle(struct llentry *lle)
2027{
2028
2029	LLE_WUNLOCK(lle);
2030	in6_lltable_destroy_lle_unlocked(lle);
2031}
2032
2033static struct llentry *
2034in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2035{
2036	struct in6_llentry *lle;
2037
2038	lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2039	if (lle == NULL)		/* NB: caller generates msg */
2040		return NULL;
2041
2042	lle->base.r_l3addr.addr6 = *addr6;
2043	lle->base.lle_refcnt = 1;
2044	lle->base.lle_free = in6_lltable_destroy_lle;
2045	LLE_LOCK_INIT(&lle->base);
2046	LLE_REQ_INIT(&lle->base);
2047	callout_init(&lle->base.lle_timer, 1);
2048
2049	return (&lle->base);
2050}
2051
2052static int
2053in6_lltable_match_prefix(const struct sockaddr *saddr,
2054    const struct sockaddr *smask, u_int flags, struct llentry *lle)
2055{
2056	const struct in6_addr *addr, *mask, *lle_addr;
2057
2058	addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2059	mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2060	lle_addr = &lle->r_l3addr.addr6;
2061
2062	if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2063		return (0);
2064
2065	if (lle->la_flags & LLE_IFADDR) {
2066
2067		/*
2068		 * Delete LLE_IFADDR records IFF address & flag matches.
2069		 * Note that addr is the interface address within prefix
2070		 * being matched.
2071		 */
2072		if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2073		    (flags & LLE_STATIC) != 0)
2074			return (1);
2075		return (0);
2076	}
2077
2078	/* flags & LLE_STATIC means deleting both dynamic and static entries */
2079	if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2080		return (1);
2081
2082	return (0);
2083}
2084
2085static void
2086in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2087{
2088	struct ifnet *ifp;
2089
2090	LLE_WLOCK_ASSERT(lle);
2091	KASSERT(llt != NULL, ("lltable is NULL"));
2092
2093	/* Unlink entry from table */
2094	if ((lle->la_flags & LLE_LINKED) != 0) {
2095
2096		ifp = llt->llt_ifp;
2097		IF_AFDATA_WLOCK_ASSERT(ifp);
2098		lltable_unlink_entry(llt, lle);
2099	}
2100
2101	if (callout_stop(&lle->lle_timer) > 0)
2102		LLE_REMREF(lle);
2103
2104	llentry_free(lle);
2105}
2106
2107static int
2108in6_lltable_rtcheck(struct ifnet *ifp,
2109		    u_int flags,
2110		    const struct sockaddr *l3addr)
2111{
2112	const struct sockaddr_in6 *sin6;
2113	struct nhop6_basic nh6;
2114	struct in6_addr dst;
2115	uint32_t scopeid;
2116	int error;
2117	char ip6buf[INET6_ADDRSTRLEN];
2118
2119	KASSERT(l3addr->sa_family == AF_INET6,
2120	    ("sin_family %d", l3addr->sa_family));
2121
2122	/* Our local addresses are always only installed on the default FIB. */
2123
2124	sin6 = (const struct sockaddr_in6 *)l3addr;
2125	in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2126	error = fib6_lookup_nh_basic(RT_DEFAULT_FIB, &dst, scopeid, 0, 0, &nh6);
2127	if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) {
2128		struct ifaddr *ifa;
2129		/*
2130		 * Create an ND6 cache for an IPv6 neighbor
2131		 * that is not covered by our own prefix.
2132		 */
2133		ifa = ifaof_ifpforaddr(l3addr, ifp);
2134		if (ifa != NULL) {
2135			ifa_free(ifa);
2136			return 0;
2137		}
2138		log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2139		    ip6_sprintf(ip6buf, &sin6->sin6_addr));
2140		return EINVAL;
2141	}
2142	return 0;
2143}
2144
2145static inline uint32_t
2146in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2147{
2148
2149	return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2150}
2151
2152static uint32_t
2153in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2154{
2155
2156	return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2157}
2158
2159static void
2160in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2161{
2162	struct sockaddr_in6 *sin6;
2163
2164	sin6 = (struct sockaddr_in6 *)sa;
2165	bzero(sin6, sizeof(*sin6));
2166	sin6->sin6_family = AF_INET6;
2167	sin6->sin6_len = sizeof(*sin6);
2168	sin6->sin6_addr = lle->r_l3addr.addr6;
2169}
2170
2171static inline struct llentry *
2172in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2173{
2174	struct llentry *lle;
2175	struct llentries *lleh;
2176	u_int hashidx;
2177
2178	hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2179	lleh = &llt->lle_head[hashidx];
2180	LIST_FOREACH(lle, lleh, lle_next) {
2181		if (lle->la_flags & LLE_DELETED)
2182			continue;
2183		if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2184			break;
2185	}
2186
2187	return (lle);
2188}
2189
2190static void
2191in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2192{
2193
2194	lle->la_flags |= LLE_DELETED;
2195	EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2196#ifdef DIAGNOSTIC
2197	log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2198#endif
2199	llentry_free(lle);
2200}
2201
2202static struct llentry *
2203in6_lltable_alloc(struct lltable *llt, u_int flags,
2204	const struct sockaddr *l3addr)
2205{
2206	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2207	struct ifnet *ifp = llt->llt_ifp;
2208	struct llentry *lle;
2209	char linkhdr[LLE_MAX_LINKHDR];
2210	size_t linkhdrsize;
2211	int lladdr_off;
2212
2213	KASSERT(l3addr->sa_family == AF_INET6,
2214	    ("sin_family %d", l3addr->sa_family));
2215
2216	/*
2217	 * A route that covers the given address must have
2218	 * been installed 1st because we are doing a resolution,
2219	 * verify this.
2220	 */
2221	if (!(flags & LLE_IFADDR) &&
2222	    in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2223		return (NULL);
2224
2225	lle = in6_lltable_new(&sin6->sin6_addr, flags);
2226	if (lle == NULL) {
2227		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2228		return (NULL);
2229	}
2230	lle->la_flags = flags;
2231	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2232		linkhdrsize = LLE_MAX_LINKHDR;
2233		if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
2234		    linkhdr, &linkhdrsize, &lladdr_off) != 0) {
2235			in6_lltable_destroy_lle_unlocked(lle);
2236			return (NULL);
2237		}
2238		lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
2239		    lladdr_off);
2240		lle->la_flags |= LLE_STATIC;
2241	}
2242
2243	if ((lle->la_flags & LLE_STATIC) != 0)
2244		lle->ln_state = ND6_LLINFO_REACHABLE;
2245
2246	return (lle);
2247}
2248
2249static struct llentry *
2250in6_lltable_lookup(struct lltable *llt, u_int flags,
2251	const struct sockaddr *l3addr)
2252{
2253	const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2254	struct llentry *lle;
2255
2256	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
2257	KASSERT(l3addr->sa_family == AF_INET6,
2258	    ("sin_family %d", l3addr->sa_family));
2259
2260	lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2261
2262	if (lle == NULL)
2263		return (NULL);
2264
2265	KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
2266	    (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
2267	    flags));
2268
2269	if (flags & LLE_UNLOCKED)
2270		return (lle);
2271
2272	if (flags & LLE_EXCLUSIVE)
2273		LLE_WLOCK(lle);
2274	else
2275		LLE_RLOCK(lle);
2276	return (lle);
2277}
2278
2279static int
2280in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2281    struct sysctl_req *wr)
2282{
2283	struct ifnet *ifp = llt->llt_ifp;
2284	/* XXX stack use */
2285	struct {
2286		struct rt_msghdr	rtm;
2287		struct sockaddr_in6	sin6;
2288		/*
2289		 * ndp.c assumes that sdl is word aligned
2290		 */
2291#ifdef __LP64__
2292		uint32_t		pad;
2293#endif
2294		struct sockaddr_dl	sdl;
2295	} ndpc;
2296	struct sockaddr_dl *sdl;
2297	int error;
2298
2299	bzero(&ndpc, sizeof(ndpc));
2300			/* skip deleted entries */
2301			if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2302				return (0);
2303			/* Skip if jailed and not a valid IP of the prison. */
2304			lltable_fill_sa_entry(lle,
2305			    (struct sockaddr *)&ndpc.sin6);
2306			if (prison_if(wr->td->td_ucred,
2307			    (struct sockaddr *)&ndpc.sin6) != 0)
2308				return (0);
2309			/*
2310			 * produce a msg made of:
2311			 *  struct rt_msghdr;
2312			 *  struct sockaddr_in6 (IPv6)
2313			 *  struct sockaddr_dl;
2314			 */
2315			ndpc.rtm.rtm_msglen = sizeof(ndpc);
2316			ndpc.rtm.rtm_version = RTM_VERSION;
2317			ndpc.rtm.rtm_type = RTM_GET;
2318			ndpc.rtm.rtm_flags = RTF_UP;
2319			ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2320			if (V_deembed_scopeid)
2321				sa6_recoverscope(&ndpc.sin6);
2322
2323			/* publish */
2324			if (lle->la_flags & LLE_PUB)
2325				ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2326
2327			sdl = &ndpc.sdl;
2328			sdl->sdl_family = AF_LINK;
2329			sdl->sdl_len = sizeof(*sdl);
2330			sdl->sdl_index = ifp->if_index;
2331			sdl->sdl_type = ifp->if_type;
2332			if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
2333				sdl->sdl_alen = ifp->if_addrlen;
2334				bcopy(lle->ll_addr, LLADDR(sdl),
2335				    ifp->if_addrlen);
2336			} else {
2337				sdl->sdl_alen = 0;
2338				bzero(LLADDR(sdl), ifp->if_addrlen);
2339			}
2340			if (lle->la_expire != 0)
2341				ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2342				    lle->lle_remtime / hz +
2343				    time_second - time_uptime;
2344			ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2345			if (lle->la_flags & LLE_STATIC)
2346				ndpc.rtm.rtm_flags |= RTF_STATIC;
2347			if (lle->la_flags & LLE_IFADDR)
2348				ndpc.rtm.rtm_flags |= RTF_PINNED;
2349			if (lle->ln_router != 0)
2350				ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2351			ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2352			/* Store state in rmx_weight value */
2353			ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2354			ndpc.rtm.rtm_index = ifp->if_index;
2355			error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2356
2357	return (error);
2358}
2359
2360static struct lltable *
2361in6_lltattach(struct ifnet *ifp)
2362{
2363	struct lltable *llt;
2364
2365	llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2366	llt->llt_af = AF_INET6;
2367	llt->llt_ifp = ifp;
2368
2369	llt->llt_lookup = in6_lltable_lookup;
2370	llt->llt_alloc_entry = in6_lltable_alloc;
2371	llt->llt_delete_entry = in6_lltable_delete_entry;
2372	llt->llt_dump_entry = in6_lltable_dump_entry;
2373	llt->llt_hash = in6_lltable_hash;
2374	llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2375	llt->llt_free_entry = in6_lltable_free_entry;
2376	llt->llt_match_prefix = in6_lltable_match_prefix;
2377 	lltable_link(llt);
2378
2379	return (llt);
2380}
2381
2382void *
2383in6_domifattach(struct ifnet *ifp)
2384{
2385	struct in6_ifextra *ext;
2386
2387	/* There are not IPv6-capable interfaces. */
2388	switch (ifp->if_type) {
2389	case IFT_PFLOG:
2390	case IFT_PFSYNC:
2391	case IFT_USB:
2392		return (NULL);
2393	}
2394	ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2395	bzero(ext, sizeof(*ext));
2396
2397	ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2398	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2399	COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2400	    sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2401
2402	ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2403	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2404	    M_WAITOK);
2405	COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2406	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2407
2408	ext->nd_ifinfo = nd6_ifattach(ifp);
2409	ext->scope6_id = scope6_ifattach(ifp);
2410	ext->lltable = in6_lltattach(ifp);
2411
2412	ext->mld_ifinfo = mld_domifattach(ifp);
2413
2414	return ext;
2415}
2416
2417int
2418in6_domifmtu(struct ifnet *ifp)
2419{
2420	if (ifp->if_afdata[AF_INET6] == NULL)
2421		return ifp->if_mtu;
2422
2423	return (IN6_LINKMTU(ifp));
2424}
2425
2426void
2427in6_domifdetach(struct ifnet *ifp, void *aux)
2428{
2429	struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2430
2431	mld_domifdetach(ifp);
2432	scope6_ifdetach(ext->scope6_id);
2433	nd6_ifdetach(ifp, ext->nd_ifinfo);
2434	lltable_free(ext->lltable);
2435	COUNTER_ARRAY_FREE(ext->in6_ifstat,
2436	    sizeof(struct in6_ifstat) / sizeof(uint64_t));
2437	free(ext->in6_ifstat, M_IFADDR);
2438	COUNTER_ARRAY_FREE(ext->icmp6_ifstat,
2439	    sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
2440	free(ext->icmp6_ifstat, M_IFADDR);
2441	free(ext, M_IFADDR);
2442}
2443
2444/*
2445 * Convert sockaddr_in6 to sockaddr_in.  Original sockaddr_in6 must be
2446 * v4 mapped addr or v4 compat addr
2447 */
2448void
2449in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2450{
2451
2452	bzero(sin, sizeof(*sin));
2453	sin->sin_len = sizeof(struct sockaddr_in);
2454	sin->sin_family = AF_INET;
2455	sin->sin_port = sin6->sin6_port;
2456	sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2457}
2458
2459/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2460void
2461in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2462{
2463	bzero(sin6, sizeof(*sin6));
2464	sin6->sin6_len = sizeof(struct sockaddr_in6);
2465	sin6->sin6_family = AF_INET6;
2466	sin6->sin6_port = sin->sin_port;
2467	sin6->sin6_addr.s6_addr32[0] = 0;
2468	sin6->sin6_addr.s6_addr32[1] = 0;
2469	sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2470	sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2471}
2472
2473/* Convert sockaddr_in6 into sockaddr_in. */
2474void
2475in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2476{
2477	struct sockaddr_in *sin_p;
2478	struct sockaddr_in6 sin6;
2479
2480	/*
2481	 * Save original sockaddr_in6 addr and convert it
2482	 * to sockaddr_in.
2483	 */
2484	sin6 = *(struct sockaddr_in6 *)nam;
2485	sin_p = (struct sockaddr_in *)nam;
2486	in6_sin6_2_sin(sin_p, &sin6);
2487}
2488
2489/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2490void
2491in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2492{
2493	struct sockaddr_in *sin_p;
2494	struct sockaddr_in6 *sin6_p;
2495
2496	sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK);
2497	sin_p = (struct sockaddr_in *)*nam;
2498	in6_sin_2_v4mapsin6(sin_p, sin6_p);
2499	free(*nam, M_SONAME);
2500	*nam = (struct sockaddr *)sin6_p;
2501}
2502