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 1.9 2004/12/21 02:54:47 hsu 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 struct in6_ifstat **in6_ifstat = NULL;
65 struct icmp6_ifstat **icmp6_ifstat = NULL;
66 size_t in6_ifstatmax = 0;
67 size_t icmp6_ifstatmax = 0;
68 unsigned long in6_maxmtu = 0;
70 #ifdef IP6_AUTO_LINKLOCAL
71 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL;
73 int ip6_auto_linklocal = 1; /* enable by default */
76 struct callout in6_tmpaddrtimer_ch;
78 extern struct inpcbinfo udbinfo;
79 extern struct inpcbinfo ripcbinfo;
81 static int get_rand_ifid (struct ifnet *, struct in6_addr *);
82 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *);
83 static int get_hw_ifid (struct ifnet *, struct in6_addr *);
84 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *);
85 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *);
86 static int in6_ifattach_loopback (struct ifnet *);
88 #define EUI64_GBIT 0x01
89 #define EUI64_UBIT 0x02
90 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0)
91 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT)
92 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6))
93 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT)
94 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6))
96 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6))
97 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6))
100 * Generate a last-resort interface identifier, when the machine has no
101 * IEEE802/EUI64 address sources.
102 * The goal here is to get an interface identifier that is
103 * (1) random enough and (2) does not change across reboot.
104 * We currently use MD5(hostname) for it.
107 get_rand_ifid(struct ifnet *ifp,
108 struct in6_addr *in6) /* upper 64bits are preserved */
112 int hostnamelen = strlen(hostname);
115 /* we need at least several letters as seed for ifid */
120 /* generate 8 bytes of pseudo-random value. */
121 bzero(&ctxt, sizeof(ctxt));
123 MD5Update(&ctxt, hostname, hostnamelen);
124 MD5Final(digest, &ctxt);
126 /* assumes sizeof(digest) > sizeof(ifid) */
127 bcopy(digest, &in6->s6_addr[8], 8);
129 /* make sure to set "u" bit to local, and "g" bit to individual. */
130 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
131 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
133 /* convert EUI64 into IPv6 interface identifier */
140 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret)
143 u_int8_t seed[16], digest[16], nullbuf[8];
147 /* If there's no hisotry, start with a random seed. */
148 bzero(nullbuf, sizeof(nullbuf));
149 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) {
152 for (i = 0; i < 2; i++) {
154 val32 = random() ^ tv.tv_usec;
155 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32));
158 bcopy(seed0, seed, 8);
161 /* copy the right-most 64-bits of the given address */
162 /* XXX assumption on the size of IFID */
163 bcopy(seed1, &seed[8], 8);
165 if (0) { /* for debugging purposes only */
168 printf("generate_tmp_ifid: new randomized ID from: ");
169 for (i = 0; i < 16; i++)
170 printf("%02x", seed[i]);
174 /* generate 16 bytes of pseudo-random value. */
175 bzero(&ctxt, sizeof(ctxt));
177 MD5Update(&ctxt, seed, sizeof(seed));
178 MD5Final(digest, &ctxt);
181 * RFC 3041 3.2.1. (3)
182 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the
183 * left-most bit is numbered 0) to zero.
185 bcopy(digest, ret, 8);
186 ret[0] &= ~EUI64_UBIT;
189 * XXX: we'd like to ensure that the generated value is not zero
190 * for simplicity. If the caclculated digest happens to be zero,
191 * use a random non-zero value as the last resort.
193 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) {
195 "generate_tmp_ifid: computed MD5 value is zero.\n");
198 val32 = random() ^ tv.tv_usec;
199 val32 = 1 + (val32 % (0xffffffff - 1));
203 * RFC 3041 3.2.1. (4)
204 * Take the rightmost 64-bits of the MD5 digest and save them in
205 * stable storage as the history value to be used in the next
206 * iteration of the algorithm.
208 bcopy(&digest[8], seed0, 8);
210 if (0) { /* for debugging purposes only */
214 for (i = 0; i < 16; i++)
215 printf("%02x", digest[i]);
223 * Get interface identifier for the specified interface.
224 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface
227 get_hw_ifid(struct ifnet *ifp,
228 struct in6_addr *in6) /* upper 64bits are preserved */
231 struct sockaddr_dl *sdl;
234 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
235 static u_int8_t allone[8] =
236 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
238 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
239 if (ifa->ifa_addr->sa_family != AF_LINK)
241 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
244 if (sdl->sdl_alen == 0)
254 addrlen = sdl->sdl_alen;
257 switch (ifp->if_type) {
265 /* IEEE802/EUI64 cases - what others? */
266 /* IEEE1394 uses 16byte length address starting with EUI64 */
270 /* look at IEEE802/EUI64 only */
271 if (addrlen != 8 && addrlen != 6)
275 * check for invalid MAC address - on bsdi, we see it a lot
276 * since wildboar configures all-zero MAC on pccard before
279 if (bcmp(addr, allzero, addrlen) == 0)
281 if (bcmp(addr, allone, addrlen) == 0)
284 /* make EUI64 address */
286 bcopy(addr, &in6->s6_addr[8], 8);
287 else if (addrlen == 6) {
288 in6->s6_addr[8] = addr[0];
289 in6->s6_addr[9] = addr[1];
290 in6->s6_addr[10] = addr[2];
291 in6->s6_addr[11] = 0xff;
292 in6->s6_addr[12] = 0xfe;
293 in6->s6_addr[13] = addr[3];
294 in6->s6_addr[14] = addr[4];
295 in6->s6_addr[15] = addr[5];
305 bzero(&in6->s6_addr[8], 8);
306 in6->s6_addr[15] = addr[0];
309 * due to insufficient bitwidth, we mark it local.
311 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */
312 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */
320 * RFC2893 says: "SHOULD use IPv4 address as ifid source".
321 * however, IPv4 address is not very suitable as unique
322 * identifier source (can be renumbered).
331 /* sanity check: g bit must not indicate "group" */
332 if (EUI64_GROUP(in6))
335 /* convert EUI64 into IPv6 interface identifier */
339 * sanity check: ifid must not be all zero, avoid conflict with
340 * subnet router anycast
342 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 &&
343 bcmp(&in6->s6_addr[9], allzero, 7) == 0) {
351 * Get interface identifier for the specified interface. If it is not
352 * available on ifp0, borrow interface identifier from other information
356 get_ifid(struct ifnet *ifp0,
357 struct ifnet *altifp, /* secondary EUI64 source */
358 struct in6_addr *in6)
362 /* first, try to get it from the interface itself */
363 if (get_hw_ifid(ifp0, in6) == 0) {
364 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
369 /* try secondary EUI64 source. this basically is for ATM PVC */
370 if (altifp && get_hw_ifid(altifp, in6) == 0) {
371 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
372 if_name(ifp0), if_name(altifp)));
376 /* next, try to get it from some other hardware interface */
377 TAILQ_FOREACH(ifp, &ifnet, if_list) {
380 if (get_hw_ifid(ifp, in6) != 0)
384 * to borrow ifid from other interface, ifid needs to be
387 if (IFID_UNIVERSAL(in6)) {
389 "%s: borrow interface identifier from %s\n",
390 if_name(ifp0), if_name(ifp)));
395 /* last resort: get from random number source */
396 if (get_rand_ifid(ifp, in6) == 0) {
398 "%s: interface identifier generated by random number\n",
403 printf("%s: failed to get interface identifier\n", if_name(ifp0));
407 nd6log((LOG_INFO, "%s: ifid: "
408 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
410 in6->s6_addr[8], in6->s6_addr[9],
411 in6->s6_addr[10], in6->s6_addr[11],
412 in6->s6_addr[12], in6->s6_addr[13],
413 in6->s6_addr[14], in6->s6_addr[15]));
418 in6_ifattach_linklocal(struct ifnet *ifp,
419 struct ifnet *altifp) /* secondary EUI64 source */
421 struct in6_ifaddr *ia;
422 struct in6_aliasreq ifra;
423 struct nd_prefix pr0;
427 * configure link-local address.
429 bzero(&ifra, sizeof(ifra));
432 * in6_update_ifa() does not use ifra_name, but we accurately set it
435 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
437 ifra.ifra_addr.sin6_family = AF_INET6;
438 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
439 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
441 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0
443 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */
445 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
446 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
447 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
448 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
450 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
452 "%s: no ifid available\n", if_name(ifp)));
457 ifra.ifra_addr.sin6_scope_id =
458 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr);
461 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
462 ifra.ifra_prefixmask.sin6_family = AF_INET6;
463 ifra.ifra_prefixmask.sin6_addr = in6mask64;
465 /* take into accound the sin6_scope_id field for routing */
466 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff;
468 /* link-local addresses should NEVER expire. */
469 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
470 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
473 * Do not let in6_update_ifa() do DAD, since we need a random delay
474 * before sending an NS at the first time the interface becomes up.
475 * Instead, in6_if_up() will start DAD with a proper random delay.
477 ifra.ifra_flags |= IN6_IFF_NODAD;
480 * Now call in6_update_ifa() to do a bunch of procedures to configure
481 * a link-local address. We can set NULL to the 3rd argument, because
482 * we know there's no other link-local address on the interface
483 * and therefore we are adding one (instead of updating one).
485 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
487 * XXX: When the interface does not support IPv6, this call
488 * would fail in the SIOCSIFADDR ioctl. I believe the
489 * notification is rather confusing in this case, so just
490 * supress it. (jinmei@kame.net 20010130)
492 if (error != EAFNOSUPPORT)
493 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
494 "configure a link-local address on %s "
496 if_name(ifp), error);
501 * Adjust ia6_flags so that in6_if_up will perform DAD.
502 * XXX: Some P2P interfaces seem not to send packets just after
503 * becoming up, so we skip p2p interfaces for safety.
505 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
508 panic("ia == NULL in in6_ifattach_linklocal");
512 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
513 ia->ia6_flags &= ~IN6_IFF_NODAD;
514 ia->ia6_flags |= IN6_IFF_TENTATIVE;
518 * Make the link-local prefix (fe80::/64%link) as on-link.
519 * Since we'd like to manage prefixes separately from addresses,
520 * we make an ND6 prefix structure for the link-local prefix,
521 * and add it to the prefix list as a never-expire prefix.
522 * XXX: this change might affect some existing code base...
524 bzero(&pr0, sizeof(pr0));
526 /* this should be 64 at this moment. */
527 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
528 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
529 pr0.ndpr_prefix = ifra.ifra_addr;
530 /* apply the mask for safety. (nd6_prelist_add will apply it again) */
531 for (i = 0; i < 4; i++) {
532 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
533 in6mask64.s6_addr32[i];
536 * Initialize parameters. The link-local prefix must always be
537 * on-link, and its lifetimes never expire.
539 pr0.ndpr_raf_onlink = 1;
540 pr0.ndpr_raf_auto = 1; /* probably meaningless */
541 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
542 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
544 * Since there is no other link-local addresses, nd6_prefix_lookup()
545 * probably returns NULL. However, we cannot always expect the result.
546 * For example, if we first remove the (only) existing link-local
547 * address, and then reconfigure another one, the prefix is still
548 * valid with referring to the old link-local address.
550 if (nd6_prefix_lookup(&pr0) == NULL) {
551 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
559 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */
561 struct in6_aliasreq ifra;
564 bzero(&ifra, sizeof(ifra));
567 * in6_update_ifa() does not use ifra_name, but we accurately set it
570 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
572 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
573 ifra.ifra_prefixmask.sin6_family = AF_INET6;
574 ifra.ifra_prefixmask.sin6_addr = in6mask128;
577 * Always initialize ia_dstaddr (= broadcast address) to loopback
578 * address. Follows IPv4 practice - see in_ifinit().
580 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
581 ifra.ifra_dstaddr.sin6_family = AF_INET6;
582 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;
584 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
585 ifra.ifra_addr.sin6_family = AF_INET6;
586 ifra.ifra_addr.sin6_addr = in6addr_loopback;
588 /* the loopback address should NEVER expire. */
589 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
590 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
592 /* we don't need to perform DAD on loopback interfaces. */
593 ifra.ifra_flags |= IN6_IFF_NODAD;
595 /* skip registration to the prefix list. XXX should be temporary. */
596 ifra.ifra_flags |= IN6_IFF_NOPFX;
599 * We are sure that this is a newly assigned address, so we can set
600 * NULL to the 3rd arg.
602 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
603 log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
604 "the loopback address on %s (errno=%d)\n",
605 if_name(ifp), error);
613 * compute NI group address, based on the current hostname setting.
614 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
616 * when ifp == NULL, the caller is responsible for filling scopeid.
619 in6_nigroup(struct ifnet *ifp, const char *name, int namelen,
620 struct in6_addr *in6)
627 char n[64]; /* a single label must not exceed 63 chars */
629 if (!namelen || !name)
633 while (p && *p && *p != '.' && p - name < namelen)
635 if (p - name > sizeof(n) - 1)
636 return -1; /* label too long */
640 for (q = n; *q; q++) {
641 if ('A' <= *q && *q <= 'Z')
645 /* generate 8 bytes of pseudo-random value. */
646 bzero(&ctxt, sizeof(ctxt));
648 MD5Update(&ctxt, &l, sizeof(l));
649 MD5Update(&ctxt, n, l);
650 MD5Final(digest, &ctxt);
652 bzero(in6, sizeof(*in6));
653 in6->s6_addr16[0] = htons(0xff02);
655 in6->s6_addr16[1] = htons(ifp->if_index);
656 in6->s6_addr8[11] = 2;
657 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));
663 in6_nigroup_attach(const char *name, int namelen)
666 struct sockaddr_in6 mltaddr;
667 struct in6_multi *in6m;
670 bzero(&mltaddr, sizeof(mltaddr));
671 mltaddr.sin6_family = AF_INET6;
672 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
673 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
676 TAILQ_FOREACH(ifp, &ifnet, if_list) {
677 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
678 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
680 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) {
681 nd6log((LOG_ERR, "%s: failed to join %s "
682 "(errno=%d)\n", if_name(ifp),
683 ip6_sprintf(&mltaddr.sin6_addr),
691 in6_nigroup_detach(const char *name, int namelen)
694 struct sockaddr_in6 mltaddr;
695 struct in6_multi *in6m;
697 bzero(&mltaddr, sizeof(mltaddr));
698 mltaddr.sin6_family = AF_INET6;
699 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
700 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
703 TAILQ_FOREACH(ifp, &ifnet, if_list) {
704 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
705 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
712 * XXX multiple loopback interface needs more care. for instance,
713 * nodelocal address needs to be configured onto only one of them.
714 * XXX multiple link-local address case
717 in6_ifattach(struct ifnet *ifp,
718 struct ifnet *altifp) /* secondary EUI64 source */
720 static size_t if_indexlim = 8;
721 struct in6_ifaddr *ia;
724 /* some of the interfaces are inherently not IPv6 capable */
725 switch (ifp->if_type) {
726 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/
736 * We have some arrays that should be indexed by if_index.
737 * since if_index will grow dynamically, they should grow too.
738 * struct in6_ifstat **in6_ifstat
739 * struct icmp6_ifstat **icmp6_ifstat
741 if (in6_ifstat == NULL || icmp6_ifstat == NULL ||
742 if_index >= if_indexlim) {
748 while (if_index >= if_indexlim)
751 /* grow in6_ifstat */
752 n = if_indexlim * sizeof(struct in6_ifstat *);
753 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
756 bcopy((caddr_t)in6_ifstat, q,
757 olim * sizeof(struct in6_ifstat *));
758 free((caddr_t)in6_ifstat, M_IFADDR);
760 in6_ifstat = (struct in6_ifstat **)q;
761 in6_ifstatmax = if_indexlim;
763 /* grow icmp6_ifstat */
764 n = if_indexlim * sizeof(struct icmp6_ifstat *);
765 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK);
768 bcopy((caddr_t)icmp6_ifstat, q,
769 olim * sizeof(struct icmp6_ifstat *));
770 free((caddr_t)icmp6_ifstat, M_IFADDR);
772 icmp6_ifstat = (struct icmp6_ifstat **)q;
773 icmp6_ifstatmax = if_indexlim;
776 /* initialize scope identifiers */
777 scope6_ifattach(ifp);
780 * quirks based on interface type
782 switch (ifp->if_type) {
786 * 6to4 interface is a very special kind of beast.
787 * no multicast, no linklocal. RFC2529 specifies how to make
788 * linklocals for 6to4 interface, but there's no use and
789 * it is rather harmful to have one.
798 * usually, we require multicast capability to the interface
800 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
801 log(LOG_INFO, "in6_ifattach: "
802 "%s is not multicast capable, IPv6 not enabled\n",
808 * assign loopback address for loopback interface.
809 * XXX multiple loopback interface case.
811 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
812 in6 = in6addr_loopback;
813 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) {
814 if (in6_ifattach_loopback(ifp) != 0)
820 * assign a link-local address, if there's none.
822 if (ip6_auto_linklocal) {
823 ia = in6ifa_ifpforlinklocal(ifp, 0);
825 if (in6_ifattach_linklocal(ifp, altifp) == 0) {
826 /* linklocal address assigned */
828 /* failed to assign linklocal address. bark? */
833 #ifdef IFT_STF /* XXX */
837 /* update dynamically. */
838 if (in6_maxmtu < ifp->if_mtu)
839 in6_maxmtu = ifp->if_mtu;
841 if (in6_ifstat[ifp->if_index] == NULL) {
842 in6_ifstat[ifp->if_index] = (struct in6_ifstat *)
843 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK);
844 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat));
846 if (icmp6_ifstat[ifp->if_index] == NULL) {
847 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *)
848 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK);
849 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat));
852 /* initialize NDP variables */
857 * NOTE: in6_ifdetach() does not support loopback if at this moment.
858 * We don't need this function in bsdi, because interfaces are never removed
859 * from the ifnet list in bsdi.
862 in6_ifdetach(struct ifnet *ifp)
864 struct in6_ifaddr *ia, *oia;
865 struct ifaddr *ifa, *next;
868 struct sockaddr_in6 sin6;
869 struct in6_multi *in6m;
870 struct in6_multi *in6m_next;
872 /* nuke prefix list. this may try to remove some of ifaddrs as well */
873 in6_purgeprefix(ifp);
875 /* remove neighbor management table */
878 /* nuke any of IPv6 addresses we have */
879 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next)
881 if (ifa->ifa_addr->sa_family != AF_INET6)
886 /* undo everything done by in6_ifattach(), just in case */
887 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) {
888 if (ifa->ifa_addr->sa_family != AF_INET6
889 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) {
893 ia = (struct in6_ifaddr *)ifa;
895 /* remove from the routing table */
896 if ((ia->ia_flags & IFA_ROUTE) &&
897 (rt = rtlookup((struct sockaddr *)&ia->ia_addr, 0, 0UL))) {
898 rtflags = rt->rt_flags;
900 rtrequest(RTM_DELETE,
901 (struct sockaddr *)&ia->ia_addr,
902 (struct sockaddr *)&ia->ia_addr,
903 (struct sockaddr *)&ia->ia_prefixmask,
904 rtflags, (struct rtentry **)0);
907 /* remove from the linked list */
908 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
909 IFAFREE(&ia->ia_ifa);
911 /* also remove from the IPv6 address chain(itojun&jinmei) */
913 if (oia == (ia = in6_ifaddr))
914 in6_ifaddr = ia->ia_next;
916 while (ia->ia_next && (ia->ia_next != oia))
919 ia->ia_next = oia->ia_next;
922 "%s: didn't unlink in6ifaddr from "
923 "list\n", if_name(ifp)));
927 IFAFREE(&oia->ia_ifa);
930 /* leave from all multicast groups joined */
931 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);
932 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
933 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) {
934 in6m_next = LIST_NEXT(in6m, in6m_entry);
935 if (in6m->in6m_ifp != ifp)
942 * remove neighbor management table. we call it twice just to make
943 * sure we nuke everything. maybe we need just one call.
944 * XXX: since the first call did not release addresses, some prefixes
945 * might remain. We should call nd6_purge() again to release the
946 * prefixes after removing all addresses above.
947 * (Or can we just delay calling nd6_purge until at this point?)
951 /* remove route to link-local allnodes multicast (ff02::1) */
952 bzero(&sin6, sizeof(sin6));
953 sin6.sin6_len = sizeof(struct sockaddr_in6);
954 sin6.sin6_family = AF_INET6;
955 sin6.sin6_addr = in6addr_linklocal_allnodes;
956 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
957 rt = rtlookup((struct sockaddr *)&sin6, 0, 0UL);
958 if (rt && rt->rt_ifp == ifp) {
960 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt),
961 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0);
966 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid,
970 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index];
972 bzero(nullbuf, sizeof(nullbuf));
973 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) {
974 /* we've never created a random ID. Create a new one. */
979 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1));
981 /* generate_tmp_ifid will update seedn and buf */
982 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1,
985 bcopy(ndi->randomid, retbuf, 8);
989 in6_tmpaddrtimer(void *ignored_arg)
992 struct nd_ifinfo *ndi;
996 callout_reset(&in6_tmpaddrtimer_ch,
997 (ip6_temp_preferred_lifetime - ip6_desync_factor -
998 ip6_temp_regen_advance) * hz,
999 in6_tmpaddrtimer, NULL);
1001 bzero(nullbuf, sizeof(nullbuf));
1002 for (i = 1; i < if_index + 1; i++) {
1003 ndi = &nd_ifinfo[i];
1004 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) {
1006 * We've been generating a random ID on this interface.
1009 (void)generate_tmp_ifid(ndi->randomseed0,