2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
38 #include <sys/socket.h>
39 #include <sys/sockio.h>
41 #include <sys/kernel.h>
43 #include <sys/syslog.h>
47 #include <net/if_var.h>
48 #include <net/if_dl.h>
49 #include <net/if_types.h>
50 #include <net/route.h>
53 #include <netinet/in.h>
54 #include <netinet/in_var.h>
55 #include <netinet/if_ether.h>
56 #include <netinet/in_pcb.h>
57 #include <netinet/ip_var.h>
58 #include <netinet/udp.h>
59 #include <netinet/udp_var.h>
61 #include <netinet/ip6.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/in6_var.h>
64 #include <netinet6/in6_pcb.h>
65 #include <netinet6/in6_ifattach.h>
66 #include <netinet6/ip6_var.h>
67 #include <netinet6/nd6.h>
68 #include <netinet6/mld6_var.h>
69 #include <netinet6/scope6_var.h>
71 VNET_DEFINE(unsigned long, in6_maxmtu) = 0;
73 #ifdef IP6_AUTO_LINKLOCAL
74 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL;
76 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */
79 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch);
80 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
82 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
83 #define V_ripcbinfo VNET(ripcbinfo)
85 static int get_rand_ifid(struct ifnet *, struct in6_addr *);
86 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *);
87 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *);
88 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *);
89 static int in6_ifattach_loopback(struct ifnet *);
90 static void in6_purgemaddrs(struct ifnet *);
92 #define EUI64_GBIT 0x01
93 #define EUI64_UBIT 0x02
94 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
95 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
96 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
97 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
98 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
100 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
101 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
104 * Generate a last-resort interface identifier, when the machine has no
105 * IEEE802/EUI64 address sources.
106 * The goal here is to get an interface identifier that is
107 * (1) random enough and (2) does not change across reboot.
108 * We currently use MD5(hostname) for it.
110 * in6 - upper 64bits are preserved
113 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6)
120 pr = curthread->td_ucred->cr_prison;
121 mtx_lock(&pr->pr_mtx);
122 hostnamelen = strlen(pr->pr_hostname);
124 /* we need at least several letters as seed for ifid */
125 if (hostnamelen < 3) {
126 mtx_unlock(&pr->pr_mtx);
131 /* generate 8 bytes of pseudo-random value. */
132 bzero(&ctxt, sizeof(ctxt));
134 MD5Update(&ctxt, pr->pr_hostname, hostnamelen);
135 mtx_unlock(&pr->pr_mtx);
136 MD5Final(digest, &ctxt);
138 /* assumes sizeof(digest) > sizeof(ifid) */
139 bcopy(digest, &in6->s6_addr[8], 8);
141 /* make sure to set "u" bit to local, and "g" bit to individual. */
142 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
143 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
145 /* convert EUI64 into IPv6 interface identifier */
152 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
155 u_int8_t seed[16], digest[16], nullbuf[8];
158 /* If there's no history, start with a random seed. */
159 bzero(nullbuf, sizeof(nullbuf));
160 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
163 for (i = 0; i < 2; i++) {
164 val32 = arc4random();
165 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
168 bcopy(seed0, seed, 8);
170 /* copy the right-most 64-bits of the given address */
171 /* XXX assumption on the size of IFID */
172 bcopy(seed1, &seed[8], 8);
174 if (0) { /* for debugging purposes only */
177 printf("generate_tmp_ifid: new randomized ID from: ");
178 for (i = 0; i < 16; i++)
179 printf("%02x", seed[i]);
183 /* generate 16 bytes of pseudo-random value. */
184 bzero(&ctxt, sizeof(ctxt));
186 MD5Update(&ctxt, seed, sizeof(seed));
187 MD5Final(digest, &ctxt);
190 * RFC 3041 3.2.1. (3)
191 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
192 * left-most bit is numbered 0) to zero.
194 bcopy(digest, ret, 8);
195 ret[0] &= ~EUI64_UBIT;
198 * XXX: we'd like to ensure that the generated value is not zero
199 * for simplicity. If the caclculated digest happens to be zero,
200 * use a random non-zero value as the last resort.
202 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
204 "generate_tmp_ifid: computed MD5 value is zero.\n"));
206 val32 = arc4random();
207 val32 = 1 + (val32 % (0xffffffff - 1));
211 * RFC 3041 3.2.1. (4)
212 * Take the rightmost 64-bits of the MD5 digest and save them in
213 * stable storage as the history value to be used in the next
214 * iteration of the algorithm.
216 bcopy(&digest[8], seed0, 8);
218 if (0) { /* for debugging purposes only */
222 for (i = 0; i < 16; i++)
223 printf("%02x", digest[i]);
231 * Get interface identifier for the specified interface.
232 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
234 * in6 - upper 64bits are preserved
237 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6)
240 struct sockaddr_dl *sdl;
243 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
244 static u_int8_t allone[8] =
245 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
248 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
249 if (ifa->ifa_addr->sa_family != AF_LINK)
251 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
254 if (sdl->sdl_alen == 0)
259 IF_ADDR_RUNLOCK(ifp);
264 IF_ADDR_LOCK_ASSERT(ifp);
266 addrlen = sdl->sdl_alen;
269 switch (ifp->if_type) {
280 /* IEEE802/EUI64 cases - what others? */
281 /* IEEE1394 uses 16byte length address starting with EUI64 */
285 /* look at IEEE802/EUI64 only */
286 if (addrlen != 8 && addrlen != 6) {
287 IF_ADDR_RUNLOCK(ifp);
292 * check for invalid MAC address - on bsdi, we see it a lot
293 * since wildboar configures all-zero MAC on pccard before
296 if (bcmp(addr, allzero, addrlen) == 0) {
297 IF_ADDR_RUNLOCK(ifp);
300 if (bcmp(addr, allone, addrlen) == 0) {
301 IF_ADDR_RUNLOCK(ifp);
305 /* make EUI64 address */
307 bcopy(addr, &in6->s6_addr[8], 8);
308 else if (addrlen == 6) {
309 in6->s6_addr[8] = addr[0];
310 in6->s6_addr[9] = addr[1];
311 in6->s6_addr[10] = addr[2];
312 in6->s6_addr[11] = 0xff;
313 in6->s6_addr[12] = 0xfe;
314 in6->s6_addr[13] = addr[3];
315 in6->s6_addr[14] = addr[4];
316 in6->s6_addr[15] = addr[5];
322 IF_ADDR_RUNLOCK(ifp);
326 IF_ADDR_RUNLOCK(ifp);
330 bzero(&in6->s6_addr[8], 8);
331 in6->s6_addr[15] = addr[0];
334 * due to insufficient bitwidth, we mark it local.
336 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
337 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
345 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
346 * however, IPv4 address is not very suitable as unique
347 * identifier source (can be renumbered).
350 IF_ADDR_RUNLOCK(ifp);
354 IF_ADDR_RUNLOCK(ifp);
358 /* sanity check: g bit must not indicate "group" */
359 if (EUI64_GROUP(in6)) {
360 IF_ADDR_RUNLOCK(ifp);
364 /* convert EUI64 into IPv6 interface identifier */
368 * sanity check: ifid must not be all zero, avoid conflict with
369 * subnet router anycast
371 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
372 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
373 IF_ADDR_RUNLOCK(ifp);
377 IF_ADDR_RUNLOCK(ifp);
382 * Get interface identifier for the specified interface. If it is not
383 * available on ifp0, borrow interface identifier from other information
386 * altifp - secondary EUI64 source
389 get_ifid(struct ifnet *ifp0, struct ifnet *altifp,
390 struct in6_addr *in6)
394 /* first, try to get it from the interface itself */
395 if (in6_get_hw_ifid(ifp0, in6) == 0) {
396 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
401 /* try secondary EUI64 source. this basically is for ATM PVC */
402 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
403 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
404 if_name(ifp0), if_name(altifp)));
408 /* next, try to get it from some other hardware interface */
409 IFNET_RLOCK_NOSLEEP();
410 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
413 if (in6_get_hw_ifid(ifp, in6) != 0)
417 * to borrow ifid from other interface, ifid needs to be
420 if (IFID_UNIVERSAL(in6)) {
422 "%s: borrow interface identifier from %s\n",
423 if_name(ifp0), if_name(ifp)));
424 IFNET_RUNLOCK_NOSLEEP();
428 IFNET_RUNLOCK_NOSLEEP();
430 /* last resort: get from random number source */
431 if (get_rand_ifid(ifp, in6) == 0) {
433 "%s: interface identifier generated by random number\n",
438 printf("%s: failed to get interface identifier\n", if_name(ifp0));
442 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
443 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10],
444 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13],
445 in6->s6_addr[14], in6->s6_addr[15]));
450 * altifp - secondary EUI64 source
453 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp)
455 struct in6_ifaddr *ia;
456 struct in6_aliasreq ifra;
457 struct nd_prefixctl pr0;
461 * configure link-local address.
463 in6_prepare_ifra(&ifra, NULL, &in6mask64);
465 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000);
466 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
467 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
468 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
469 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
471 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
473 "%s: no ifid available\n", if_name(ifp)));
477 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL))
480 /* link-local addresses should NEVER expire. */
481 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
482 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
485 * Now call in6_update_ifa() to do a bunch of procedures to configure
486 * a link-local address. We can set the 3rd argument to NULL, because
487 * we know there's no other link-local address on the interface
488 * and therefore we are adding one (instead of updating one).
490 if ((error = in6_update_ifa(ifp, &ifra, NULL,
491 IN6_IFAUPDATE_DADDELAY)) != 0) {
493 * XXX: When the interface does not support IPv6, this call
494 * would fail in the SIOCSIFADDR ioctl. I believe the
495 * notification is rather confusing in this case, so just
496 * suppress it. (jinmei@kame.net 20010130)
498 if (error != EAFNOSUPPORT)
499 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to "
500 "configure a link-local address on %s "
502 if_name(ifp), error));
506 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
507 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
509 ifa_free(&ia->ia_ifa);
512 * Make the link-local prefix (fe80::%link/64) as on-link.
513 * Since we'd like to manage prefixes separately from addresses,
514 * we make an ND6 prefix structure for the link-local prefix,
515 * and add it to the prefix list as a never-expire prefix.
516 * XXX: this change might affect some existing code base...
518 bzero(&pr0, sizeof(pr0));
520 /* this should be 64 at this moment. */
521 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
522 pr0.ndpr_prefix = ifra.ifra_addr;
523 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
524 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64);
526 * Initialize parameters. The link-local prefix must always be
527 * on-link, and its lifetimes never expire.
529 pr0.ndpr_raf_onlink = 1;
530 pr0.ndpr_raf_auto = 1; /* probably meaningless */
531 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
532 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
534 * Since there is no other link-local addresses, nd6_prefix_lookup()
535 * probably returns NULL. However, we cannot always expect the result.
536 * For example, if we first remove the (only) existing link-local
537 * address, and then reconfigure another one, the prefix is still
538 * valid with referring to the old link-local address.
540 if (nd6_prefix_lookup(&pr0) == NULL) {
541 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
549 * ifp - must be IFT_LOOP
552 in6_ifattach_loopback(struct ifnet *ifp)
554 struct in6_aliasreq ifra;
557 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128);
560 * Always initialize ia_dstaddr (= broadcast address) to loopback
561 * address. Follows IPv4 practice - see in_ifinit().
563 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
564 ifra.ifra_dstaddr.sin6_family = AF_INET6;
565 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
567 /* the loopback address should NEVER expire. */
568 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
569 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
571 /* we don't need to perform DAD on loopback interfaces. */
572 ifra.ifra_flags |= IN6_IFF_NODAD;
574 /* skip registration to the prefix list. XXX should be temporary. */
575 ifra.ifra_flags |= IN6_IFF_NOPFX;
578 * We are sure that this is a newly assigned address, so we can set
579 * NULL to the 3rd arg.
581 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) {
582 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure "
583 "the loopback address on %s (errno=%d)\n",
584 if_name(ifp), error));
592 * compute NI group address, based on the current hostname setting.
595 * when ifp == NULL, the caller is responsible for filling scopeid.
597 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address
598 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620.
601 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen,
602 struct in6_addr *in6, int oldmcprefix)
610 char n[64]; /* a single label must not exceed 63 chars */
613 * If no name is given and namelen is -1,
614 * we try to do the hostname lookup ourselves.
616 if (!name && namelen == -1) {
617 pr = curthread->td_ucred->cr_prison;
618 mtx_lock(&pr->pr_mtx);
619 name = pr->pr_hostname;
620 namelen = strlen(name);
623 if (!name || !namelen) {
625 mtx_unlock(&pr->pr_mtx);
630 while (p && *p && *p != '.' && p - name < namelen)
632 if (p == name || p - name > sizeof(n) - 1) {
634 mtx_unlock(&pr->pr_mtx);
635 return -1; /* label too long */
640 mtx_unlock(&pr->pr_mtx);
642 for (q = n; *q; q++) {
643 if ('A' <= *q && *q <= 'Z')
647 /* generate 16 bytes of pseudo-random value. */
648 bzero(&ctxt, sizeof(ctxt));
650 MD5Update(&ctxt, &l, sizeof(l));
651 MD5Update(&ctxt, n, l);
652 MD5Final(digest, &ctxt);
654 bzero(in6, sizeof(*in6));
655 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL;
656 in6->s6_addr8[11] = 2;
657 if (oldmcprefix == 0) {
658 in6->s6_addr8[12] = 0xff;
659 /* Copy the first 24 bits of 128-bit hash into the address. */
660 bcopy(digest, &in6->s6_addr8[13], 3);
662 /* Copy the first 32 bits of 128-bit hash into the address. */
663 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
665 if (in6_setscope(in6, ifp, NULL))
666 return (-1); /* XXX: should not fail */
672 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
673 struct in6_addr *in6)
676 return (in6_nigroup0(ifp, name, namelen, in6, 0));
680 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen,
681 struct in6_addr *in6)
684 return (in6_nigroup0(ifp, name, namelen, in6, 1));
688 * XXX multiple loopback interface needs more care. for instance,
689 * nodelocal address needs to be configured onto only one of them.
690 * XXX multiple link-local address case
692 * altifp - secondary EUI64 source
695 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
697 struct in6_ifaddr *ia;
700 if (ifp->if_afdata[AF_INET6] == NULL)
703 * quirks based on interface type
705 switch (ifp->if_type) {
708 * 6to4 interface is a very special kind of beast.
709 * no multicast, no linklocal. RFC2529 specifies how to make
710 * linklocals for 6to4 interface, but there's no use and
711 * it is rather harmful to have one.
713 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
720 * usually, we require multicast capability to the interface
722 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
723 nd6log((LOG_INFO, "in6_ifattach: "
724 "%s is not multicast capable, IPv6 not enabled\n",
730 * assign loopback address for loopback interface.
731 * XXX multiple loopback interface case.
733 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
736 in6 = in6addr_loopback;
737 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6);
739 if (in6_ifattach_loopback(ifp) != 0)
746 * assign a link-local address, if there's none.
748 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
749 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) {
752 ia = in6ifa_ifpforlinklocal(ifp, 0);
754 error = in6_ifattach_linklocal(ifp, altifp);
757 log(LOG_NOTICE, "in6_ifattach_linklocal: "
758 "failed to add a link-local addr to %s\n",
762 ifa_free(&ia->ia_ifa);
765 /* update dynamically. */
766 if (V_in6_maxmtu < ifp->if_mtu)
767 V_in6_maxmtu = ifp->if_mtu;
771 * NOTE: in6_ifdetach() does not support loopback if at this moment.
772 * We don't need this function in bsdi, because interfaces are never removed
773 * from the ifnet list in bsdi.
776 in6_ifdetach(struct ifnet *ifp)
778 struct in6_ifaddr *ia;
779 struct ifaddr *ifa, *next;
780 struct radix_node_head *rnh;
782 struct sockaddr_in6 sin6;
783 struct in6_multi_mship *imm;
785 if (ifp->if_afdata[AF_INET6] == NULL)
788 /* remove neighbor management table */
791 /* nuke any of IPv6 addresses we have */
792 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
793 if (ifa->ifa_addr->sa_family != AF_INET6)
798 /* undo everything done by in6_ifattach(), just in case */
799 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
800 if (ifa->ifa_addr->sa_family != AF_INET6
801 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
805 ia = (struct in6_ifaddr *)ifa;
808 * leave from multicast groups we have joined for the interface
810 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
811 LIST_REMOVE(imm, i6mm_chain);
815 /* Remove link-local from the routing table. */
816 if (ia->ia_flags & IFA_ROUTE)
817 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags);
819 /* remove from the linked list */
821 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
822 IF_ADDR_WUNLOCK(ifp);
823 ifa_free(ifa); /* if_addrhead */
826 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link);
827 IN6_IFADDR_WUNLOCK();
831 in6_pcbpurgeif0(&V_udbinfo, ifp);
832 in6_pcbpurgeif0(&V_ripcbinfo, ifp);
833 /* leave from all multicast groups joined */
834 in6_purgemaddrs(ifp);
837 * remove neighbor management table. we call it twice just to make
838 * sure we nuke everything. maybe we need just one call.
839 * XXX: since the first call did not release addresses, some prefixes
840 * might remain. We should call nd6_purge() again to release the
841 * prefixes after removing all addresses above.
842 * (Or can we just delay calling nd6_purge until at this point?)
847 * Remove route to link-local allnodes multicast (ff02::1).
848 * These only get automatically installed for the default FIB.
850 bzero(&sin6, sizeof(sin6));
851 sin6.sin6_len = sizeof(struct sockaddr_in6);
852 sin6.sin6_family = AF_INET6;
853 sin6.sin6_addr = in6addr_linklocal_allnodes;
854 if (in6_setscope(&sin6.sin6_addr, ifp, NULL))
855 /* XXX: should not fail */
857 /* XXX grab lock first to avoid LOR */
858 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6);
860 RADIX_NODE_HEAD_LOCK(rnh);
861 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED,
864 if (rt->rt_ifp == ifp)
868 RADIX_NODE_HEAD_UNLOCK(rnh);
873 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf,
874 const u_int8_t *baseid, int generate)
877 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
879 bzero(nullbuf, sizeof(nullbuf));
880 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
881 /* we've never created a random ID. Create a new one. */
886 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
888 /* generate_tmp_ifid will update seedn and buf */
889 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
892 bcopy(ndi->randomid, retbuf, 8);
898 in6_tmpaddrtimer(void *arg)
900 CURVNET_SET((struct vnet *) arg);
901 struct nd_ifinfo *ndi;
905 callout_reset(&V_in6_tmpaddrtimer_ch,
906 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
907 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet);
909 bzero(nullbuf, sizeof(nullbuf));
910 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
911 if (ifp->if_afdata[AF_INET6] == NULL)
913 ndi = ND_IFINFO(ifp);
914 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
916 * We've been generating a random ID on this interface.
919 (void)generate_tmp_ifid(ndi->randomseed0,
920 ndi->randomseed1, ndi->randomid);
928 in6_purgemaddrs(struct ifnet *ifp)
930 LIST_HEAD(,in6_multi) purgeinms;
931 struct in6_multi *inm, *tinm;
932 struct ifmultiaddr *ifma;
934 LIST_INIT(&purgeinms);
938 * Extract list of in6_multi associated with the detaching ifp
939 * which the PF_INET6 layer is about to release.
940 * We need to do this as IF_ADDR_LOCK() may be re-acquired
941 * by code further down.
944 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
945 if (ifma->ifma_addr->sa_family != AF_INET6 ||
946 ifma->ifma_protospec == NULL)
948 inm = (struct in6_multi *)ifma->ifma_protospec;
949 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry);
951 IF_ADDR_RUNLOCK(ifp);
953 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) {
954 LIST_REMOVE(inm, in6m_entry);
955 in6m_release_locked(inm);