1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/in6_ifattach.c,v 1.12 2005/02/01 16:09:37 hrs Exp $ */
3 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/malloc.h>
37 #include <sys/socket.h>
38 #include <sys/sockio.h>
39 #include <sys/kernel.h>
40 #include <sys/syslog.h>
44 #include <net/if_dl.h>
45 #include <net/if_types.h>
46 #include <net/route.h>
48 #include <netinet/in.h>
49 #include <netinet/in_var.h>
50 #include <netinet/if_ether.h>
51 #include <netinet/in_pcb.h>
53 #include <netinet/ip6.h>
54 #include <netinet6/ip6_var.h>
55 #include <netinet6/in6_var.h>
56 #include <netinet6/in6_pcb.h>
57 #include <netinet6/in6_ifattach.h>
58 #include <netinet6/ip6_var.h>
59 #include <netinet6/nd6.h>
60 #include <netinet6/scope6_var.h>
62 #include <net/net_osdep.h>
64 unsigned long in6_maxmtu = 0;
66 #ifdef IP6_AUTO_LINKLOCAL
67 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
69 int ip6_auto_linklocal = 1; /* enable by default */
72 struct callout in6_tmpaddrtimer_ch;
74 extern struct inpcbinfo udbinfo;
75 extern struct inpcbinfo ripcbinfo;
77 static int get_rand_ifid (struct ifnet *, struct in6_addr *);
78 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *);
79 static int get_hw_ifid (struct ifnet *, struct in6_addr *);
80 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *);
81 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *);
82 static int in6_ifattach_loopback (struct ifnet *);
84 #define EUI64_GBIT 0x01
85 #define EUI64_UBIT 0x02
86 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
87 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
88 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
89 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
90 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
92 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
93 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
96 * Generate a last-resort interface identifier, when the machine has no
97 * IEEE802/EUI64 address sources.
98 * The goal here is to get an interface identifier that is
99 * (1) random enough and (2) does not change across reboot.
100 * We currently use MD5(hostname) for it.
103 get_rand_ifid(struct ifnet *ifp,
104 struct in6_addr *in6) /* upper 64bits are preserved */
108 int hostnamelen = strlen(hostname);
111 /* we need at least several letters as seed for ifid */
116 /* generate 8 bytes of pseudo-random value. */
117 bzero(&ctxt, sizeof(ctxt));
119 MD5Update(&ctxt, hostname, hostnamelen);
120 MD5Final(digest, &ctxt);
122 /* assumes sizeof(digest) > sizeof(ifid) */
123 bcopy(digest, &in6->s6_addr[8], 8);
125 /* make sure to set "u" bit to local, and "g" bit to individual. */
126 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
127 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
129 /* convert EUI64 into IPv6 interface identifier */
136 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
139 u_int8_t seed[16], digest[16], nullbuf[8];
143 /* If there's no hisotry, start with a random seed. */
144 bzero(nullbuf, sizeof(nullbuf));
145 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
148 for (i = 0; i < 2; i++) {
150 val32 = random() ^ tv.tv_usec;
151 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
154 bcopy(seed0, seed, 8);
157 /* copy the right-most 64-bits of the given address */
158 /* XXX assumption on the size of IFID */
159 bcopy(seed1, &seed[8], 8);
161 if (0) { /* for debugging purposes only */
164 printf("generate_tmp_ifid: new randomized ID from: ");
165 for (i = 0; i < 16; i++)
166 printf("%02x", seed[i]);
170 /* generate 16 bytes of pseudo-random value. */
171 bzero(&ctxt, sizeof(ctxt));
173 MD5Update(&ctxt, seed, sizeof(seed));
174 MD5Final(digest, &ctxt);
177 * RFC 3041 3.2.1. (3)
178 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
179 * left-most bit is numbered 0) to zero.
181 bcopy(digest, ret, 8);
182 ret[0] &= ~EUI64_UBIT;
185 * XXX: we'd like to ensure that the generated value is not zero
186 * for simplicity. If the caclculated digest happens to be zero,
187 * use a random non-zero value as the last resort.
189 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
191 "generate_tmp_ifid: computed MD5 value is zero.\n");
194 val32 = random() ^ tv.tv_usec;
195 val32 = 1 + (val32 % (0xffffffff - 1));
199 * RFC 3041 3.2.1. (4)
200 * Take the rightmost 64-bits of the MD5 digest and save them in
201 * stable storage as the history value to be used in the next
202 * iteration of the algorithm.
204 bcopy(&digest[8], seed0, 8);
206 if (0) { /* for debugging purposes only */
210 for (i = 0; i < 16; i++)
211 printf("%02x", digest[i]);
219 * Get interface identifier for the specified interface.
220 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
223 get_hw_ifid(struct ifnet *ifp,
224 struct in6_addr *in6) /* upper 64bits are preserved */
227 struct sockaddr_dl *sdl;
230 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
231 static u_int8_t allone[8] =
232 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
234 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
235 if (ifa->ifa_addr->sa_family != AF_LINK)
237 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
240 if (sdl->sdl_alen == 0)
250 addrlen = sdl->sdl_alen;
253 switch (ifp->if_type) {
261 /* IEEE802/EUI64 cases - what others? */
262 /* IEEE1394 uses 16byte length address starting with EUI64 */
266 /* look at IEEE802/EUI64 only */
267 if (addrlen != 8 && addrlen != 6)
271 * check for invalid MAC address - on bsdi, we see it a lot
272 * since wildboar configures all-zero MAC on pccard before
275 if (bcmp(addr, allzero, addrlen) == 0)
277 if (bcmp(addr, allone, addrlen) == 0)
280 /* make EUI64 address */
282 bcopy(addr, &in6->s6_addr[8], 8);
283 else if (addrlen == 6) {
284 in6->s6_addr[8] = addr[0];
285 in6->s6_addr[9] = addr[1];
286 in6->s6_addr[10] = addr[2];
287 in6->s6_addr[11] = 0xff;
288 in6->s6_addr[12] = 0xfe;
289 in6->s6_addr[13] = addr[3];
290 in6->s6_addr[14] = addr[4];
291 in6->s6_addr[15] = addr[5];
301 bzero(&in6->s6_addr[8], 8);
302 in6->s6_addr[15] = addr[0];
305 * due to insufficient bitwidth, we mark it local.
307 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
308 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
316 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
317 * however, IPv4 address is not very suitable as unique
318 * identifier source (can be renumbered).
327 /* sanity check: g bit must not indicate "group" */
328 if (EUI64_GROUP(in6))
331 /* convert EUI64 into IPv6 interface identifier */
335 * sanity check: ifid must not be all zero, avoid conflict with
336 * subnet router anycast
338 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
339 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
347 * Get interface identifier for the specified interface. If it is not
348 * available on ifp0, borrow interface identifier from other information
352 get_ifid(struct ifnet *ifp0,
353 struct ifnet *altifp, /* secondary EUI64 source */
354 struct in6_addr *in6)
358 /* first, try to get it from the interface itself */
359 if (get_hw_ifid(ifp0, in6) == 0) {
360 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
365 /* try secondary EUI64 source. this basically is for ATM PVC */
366 if (altifp && get_hw_ifid(altifp, in6) == 0) {
367 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
368 if_name(ifp0), if_name(altifp)));
372 /* next, try to get it from some other hardware interface */
373 TAILQ_FOREACH(ifp, &ifnet, if_list) {
376 if (get_hw_ifid(ifp, in6) != 0)
380 * to borrow ifid from other interface, ifid needs to be
383 if (IFID_UNIVERSAL(in6)) {
385 "%s: borrow interface identifier from %s\n",
386 if_name(ifp0), if_name(ifp)));
391 /* last resort: get from random number source */
392 if (get_rand_ifid(ifp, in6) == 0) {
394 "%s: interface identifier generated by random number\n",
399 printf("%s: failed to get interface identifier\n", if_name(ifp0));
403 nd6log((LOG_INFO, "%s: ifid: "
404 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
406 in6->s6_addr[8], in6->s6_addr[9],
407 in6->s6_addr[10], in6->s6_addr[11],
408 in6->s6_addr[12], in6->s6_addr[13],
409 in6->s6_addr[14], in6->s6_addr[15]));
414 in6_ifattach_linklocal(struct ifnet *ifp,
415 struct ifnet *altifp) /* secondary EUI64 source */
417 struct in6_ifaddr *ia;
418 struct in6_aliasreq ifra;
419 struct nd_prefix pr0;
423 * configure link-local address.
425 bzero(&ifra, sizeof(ifra));
428 * in6_update_ifa() does not use ifra_name, but we accurately set it
431 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
433 ifra.ifra_addr.sin6_family = AF_INET6;
434 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
435 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
436 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */
437 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
438 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
439 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
440 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
442 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
444 "%s: no ifid available\n", if_name(ifp)));
449 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
450 ifra.ifra_prefixmask.sin6_family = AF_INET6;
451 ifra.ifra_prefixmask.sin6_addr = in6mask64;
453 /* link-local addresses should NEVER expire. */
454 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
455 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
458 * Do not let in6_update_ifa() do DAD, since we need a random delay
459 * before sending an NS at the first time the interface becomes up.
460 * Instead, in6_if_up() will start DAD with a proper random delay.
462 ifra.ifra_flags |= IN6_IFF_NODAD;
465 * Now call in6_update_ifa() to do a bunch of procedures to configure
466 * a link-local address. We can set NULL to the 3rd argument, because
467 * we know there's no other link-local address on the interface
468 * and therefore we are adding one (instead of updating one).
470 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
472 * XXX: When the interface does not support IPv6, this call
473 * would fail in the SIOCSIFADDR ioctl. I believe the
474 * notification is rather confusing in this case, so just
475 * supress it. (jinmei@kame.net 20010130)
477 if (error != EAFNOSUPPORT)
478 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
479 "configure a link-local address on %s "
481 if_name(ifp), error);
486 * Adjust ia6_flags so that in6_if_up will perform DAD.
487 * XXX: Some P2P interfaces seem not to send packets just after
488 * becoming up, so we skip p2p interfaces for safety.
490 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
493 panic("ia == NULL in in6_ifattach_linklocal");
497 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
498 ia->ia6_flags &= ~IN6_IFF_NODAD;
499 ia->ia6_flags |= IN6_IFF_TENTATIVE;
503 * Make the link-local prefix (fe80::/64%link) as on-link.
504 * Since we'd like to manage prefixes separately from addresses,
505 * we make an ND6 prefix structure for the link-local prefix,
506 * and add it to the prefix list as a never-expire prefix.
507 * XXX: this change might affect some existing code base...
509 bzero(&pr0, sizeof(pr0));
511 /* this should be 64 at this moment. */
512 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
513 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
514 pr0.ndpr_prefix = ifra.ifra_addr;
515 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
516 for (i = 0; i < 4; i++) {
517 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
518 in6mask64.s6_addr32[i];
521 * Initialize parameters. The link-local prefix must always be
522 * on-link, and its lifetimes never expire.
524 pr0.ndpr_raf_onlink = 1;
525 pr0.ndpr_raf_auto = 1; /* probably meaningless */
526 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
527 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
529 * Since there is no other link-local addresses, nd6_prefix_lookup()
530 * probably returns NULL. However, we cannot always expect the result.
531 * For example, if we first remove the (only) existing link-local
532 * address, and then reconfigure another one, the prefix is still
533 * valid with referring to the old link-local address.
535 if (nd6_prefix_lookup(&pr0) == NULL) {
536 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
544 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */
546 struct in6_aliasreq ifra;
549 bzero(&ifra, sizeof(ifra));
552 * in6_update_ifa() does not use ifra_name, but we accurately set it
555 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
557 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
558 ifra.ifra_prefixmask.sin6_family = AF_INET6;
559 ifra.ifra_prefixmask.sin6_addr = in6mask128;
562 * Always initialize ia_dstaddr (= broadcast address) to loopback
563 * address. Follows IPv4 practice - see in_ifinit().
565 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
566 ifra.ifra_dstaddr.sin6_family = AF_INET6;
567 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
569 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
570 ifra.ifra_addr.sin6_family = AF_INET6;
571 ifra.ifra_addr.sin6_addr = in6addr_loopback;
573 /* the loopback address should NEVER expire. */
574 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
575 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
577 /* we don't need to perform DAD on loopback interfaces. */
578 ifra.ifra_flags |= IN6_IFF_NODAD;
580 /* skip registration to the prefix list. XXX should be temporary. */
581 ifra.ifra_flags |= IN6_IFF_NOPFX;
584 * We are sure that this is a newly assigned address, so we can set
585 * NULL to the 3rd arg.
587 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
588 log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
589 "the loopback address on %s (errno=%d)\n",
590 if_name(ifp), error);
598 * compute NI group address, based on the current hostname setting.
599 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
601 * when ifp == NULL, the caller is responsible for filling scopeid.
604 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
605 struct in6_addr *in6)
612 char n[64]; /* a single label must not exceed 63 chars */
614 if (!namelen || !name)
618 while (p && *p && *p != '.' && p - name < namelen)
620 if (p - name > sizeof(n) - 1)
621 return -1; /* label too long */
625 for (q = n; *q; q++) {
626 if ('A' <= *q && *q <= 'Z')
630 /* generate 8 bytes of pseudo-random value. */
631 bzero(&ctxt, sizeof(ctxt));
633 MD5Update(&ctxt, &l, sizeof(l));
634 MD5Update(&ctxt, n, l);
635 MD5Final(digest, &ctxt);
637 bzero(in6, sizeof(*in6));
638 in6->s6_addr16[0] = htons(0xff02);
640 in6->s6_addr16[1] = htons(ifp->if_index);
641 in6->s6_addr8[11] = 2;
642 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
648 in6_nigroup_attach(const char *name, int namelen)
651 struct sockaddr_in6 mltaddr;
652 struct in6_multi *in6m;
655 bzero(&mltaddr, sizeof(mltaddr));
656 mltaddr.sin6_family = AF_INET6;
657 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
658 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
661 TAILQ_FOREACH(ifp, &ifnet, if_list) {
662 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
663 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
665 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) {
666 nd6log((LOG_ERR, "%s: failed to join %s "
667 "(errno=%d)\n", if_name(ifp),
668 ip6_sprintf(&mltaddr.sin6_addr),
676 in6_nigroup_detach(const char *name, int namelen)
679 struct sockaddr_in6 mltaddr;
680 struct in6_multi *in6m;
682 bzero(&mltaddr, sizeof(mltaddr));
683 mltaddr.sin6_family = AF_INET6;
684 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
685 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
688 TAILQ_FOREACH(ifp, &ifnet, if_list) {
689 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
690 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
697 * XXX multiple loopback interface needs more care. for instance,
698 * nodelocal address needs to be configured onto only one of them.
699 * XXX multiple link-local address case
702 in6_ifattach(struct ifnet *ifp,
703 struct ifnet *altifp) /* secondary EUI64 source */
705 struct in6_ifaddr *ia;
708 /* some of the interfaces are inherently not IPv6 capable */
709 switch (ifp->if_type) {
710 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/
720 * quirks based on interface type
722 switch (ifp->if_type) {
726 * 6to4 interface is a very special kind of beast.
727 * no multicast, no linklocal. RFC2529 specifies how to make
728 * linklocals for 6to4 interface, but there's no use and
729 * it is rather harmful to have one.
738 * usually, we require multicast capability to the interface
740 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
741 log(LOG_INFO, "in6_ifattach: "
742 "%s is not multicast capable, IPv6 not enabled\n",
748 * assign loopback address for loopback interface.
749 * XXX multiple loopback interface case.
751 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
752 in6 = in6addr_loopback;
753 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
754 if (in6_ifattach_loopback(ifp) != 0)
760 * assign a link-local address, if there's none.
762 if (ip6_auto_linklocal) {
763 ia = in6ifa_ifpforlinklocal(ifp, 0);
765 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
766 /* linklocal address assigned */
768 /* failed to assign linklocal address. bark? */
773 #ifdef IFT_STF /* XXX */
777 /* update dynamically. */
778 if (in6_maxmtu < ifp->if_mtu)
779 in6_maxmtu = ifp->if_mtu;
783 * NOTE: in6_ifdetach() does not support loopback if at this moment.
784 * We don't need this function in bsdi, because interfaces are never removed
785 * from the ifnet list in bsdi.
788 in6_ifdetach(struct ifnet *ifp)
790 struct in6_ifaddr *ia, *oia;
791 struct ifaddr *ifa, *next;
794 struct sockaddr_in6 sin6;
795 struct in6_multi *in6m;
796 struct in6_multi *in6m_next;
798 /* nuke prefix list. this may try to remove some of ifaddrs as well */
799 in6_purgeprefix(ifp);
801 /* remove neighbor management table */
804 /* nuke any of IPv6 addresses we have */
805 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next)
807 if (ifa->ifa_addr->sa_family != AF_INET6)
812 /* undo everything done by in6_ifattach(), just in case */
813 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) {
814 if (ifa->ifa_addr->sa_family != AF_INET6
815 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
819 ia = (struct in6_ifaddr *)ifa;
821 /* remove from the routing table */
822 if ((ia->ia_flags & IFA_ROUTE) &&
823 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) {
824 rtflags = rt->rt_flags;
826 rtrequest(RTM_DELETE,
827 (struct sockaddr *)&ia->ia_addr,
828 (struct sockaddr *)&ia->ia_addr,
829 (struct sockaddr *)&ia->ia_prefixmask,
830 rtflags, (struct rtentry **)0);
833 /* remove from the linked list */
834 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
835 IFAFREE(&ia->ia_ifa);
837 /* also remove from the IPv6 address chain(itojun&jinmei) */
839 if (oia == (ia = in6_ifaddr))
840 in6_ifaddr = ia->ia_next;
842 while (ia->ia_next && (ia->ia_next != oia))
845 ia->ia_next = oia->ia_next;
848 "%s: didn't unlink in6ifaddr from "
849 "list\n", if_name(ifp)));
853 IFAFREE(&oia->ia_ifa);
856 /* leave from all multicast groups joined */
857 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);
858 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
859 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
860 in6m_next = LIST_NEXT(in6m, in6m_entry);
861 if (in6m->in6m_ifp != ifp)
868 * remove neighbor management table. we call it twice just to make
869 * sure we nuke everything. maybe we need just one call.
870 * XXX: since the first call did not release addresses, some prefixes
871 * might remain. We should call nd6_purge() again to release the
872 * prefixes after removing all addresses above.
873 * (Or can we just delay calling nd6_purge until at this point?)
877 /* remove route to link-local allnodes multicast (ff02::1) */
878 bzero(&sin6, sizeof(sin6));
879 sin6.sin6_len = sizeof(struct sockaddr_in6);
880 sin6.sin6_family = AF_INET6;
881 sin6.sin6_addr = in6addr_linklocal_allnodes;
882 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
883 rt = rtpurelookup((struct sockaddr *)&sin6);
884 if (rt != NULL && rt->rt_ifp == ifp) {
886 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
887 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
892 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
896 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
898 bzero(nullbuf, sizeof(nullbuf));
899 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
900 /* we've never created a random ID. Create a new one. */
905 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
907 /* generate_tmp_ifid will update seedn and buf */
908 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
911 bcopy(ndi->randomid, retbuf, 8);
915 in6_tmpaddrtimer(void *ignored_arg)
917 struct nd_ifinfo *ndi;
922 callout_reset(&in6_tmpaddrtimer_ch,
923 (ip6_temp_preferred_lifetime - ip6_desync_factor -
924 ip6_temp_regen_advance) * hz,
925 in6_tmpaddrtimer, NULL);
927 bzero(nullbuf, sizeof(nullbuf));
928 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
929 ndi = ND_IFINFO(ifp);
930 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
932 * We've been generating a random ID on this interface.
935 (void)generate_tmp_ifid(ndi->randomseed0,