1 /* $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/in6.c,v 1.7 2004/03/23 22:19:08 hsu Exp $ */
3 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi 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
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)in.c 8.2 (Berkeley) 11/15/93
70 #include "opt_inet6.h"
72 #include <sys/param.h>
73 #include <sys/errno.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>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
85 #include <net/if_types.h>
86 #include <net/route.h>
87 #include <net/if_dl.h>
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <netinet/if_ether.h>
93 #include <netinet/in_systm.h>
94 #include <netinet/ip.h>
95 #include <netinet/in_pcb.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/nd6.h>
101 #include <netinet6/mld6_var.h>
102 #include <netinet6/ip6_mroute.h>
103 #include <netinet6/in6_ifattach.h>
104 #include <netinet6/scope6_var.h>
105 #ifndef SCOPEDROUTING
106 #include <netinet6/in6_pcb.h>
109 #include <net/net_osdep.h>
111 MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address");
114 * Definitions of some costant IP6 addresses.
116 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
117 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
118 const struct in6_addr in6addr_nodelocal_allnodes =
119 IN6ADDR_NODELOCAL_ALLNODES_INIT;
120 const struct in6_addr in6addr_linklocal_allnodes =
121 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
122 const struct in6_addr in6addr_linklocal_allrouters =
123 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
125 const struct in6_addr in6mask0 = IN6MASK0;
126 const struct in6_addr in6mask32 = IN6MASK32;
127 const struct in6_addr in6mask64 = IN6MASK64;
128 const struct in6_addr in6mask96 = IN6MASK96;
129 const struct in6_addr in6mask128 = IN6MASK128;
131 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
132 0, 0, IN6ADDR_ANY_INIT, 0};
134 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t,
135 struct ifnet *, struct thread *);
136 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *,
137 struct sockaddr_in6 *, int);
138 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *);
140 struct in6_multihead in6_multihead; /* XXX BSS initialization */
142 int (*faithprefix_p)(struct in6_addr *);
145 * Subroutine for in6_ifaddloop() and in6_ifremloop().
146 * This routine does actual work.
149 in6_ifloop_request(int cmd, struct ifaddr *ifa)
151 struct sockaddr_in6 all1_sa;
152 struct rtentry *nrt = NULL;
155 bzero(&all1_sa, sizeof(all1_sa));
156 all1_sa.sin6_family = AF_INET6;
157 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
158 all1_sa.sin6_addr = in6mask128;
161 * We specify the address itself as the gateway, and set the
162 * RTF_LLINFO flag, so that the corresponding host route would have
163 * the flag, and thus applications that assume traditional behavior
164 * would be happy. Note that we assume the caller of the function
165 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
166 * which changes the outgoing interface to the loopback interface.
168 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr,
169 (struct sockaddr *)&all1_sa,
170 RTF_UP|RTF_HOST|RTF_LLINFO, &nrt);
172 log(LOG_ERR, "in6_ifloop_request: "
173 "%s operation failed for %s (errno=%d)\n",
174 cmd == RTM_ADD ? "ADD" : "DELETE",
175 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
180 * Make sure rt_ifa be equal to IFA, the second argument of the
182 * We need this because when we refer to rt_ifa->ia6_flags in
183 * ip6_input, we assume that the rt_ifa points to the address instead
184 * of the loopback address.
186 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) {
187 IFAFREE(nrt->rt_ifa);
193 * Report the addition/removal of the address to the routing socket.
194 * XXX: since we called rtinit for a p2p interface with a destination,
195 * we end up reporting twice in such a case. Should we rather
196 * omit the second report?
199 rt_newaddrmsg(cmd, ifa, e, nrt);
200 if (cmd == RTM_DELETE) {
201 if (nrt->rt_refcnt <= 0) {
202 /* XXX: we should free the entry ourselves. */
207 /* the cmd must be RTM_ADD here */
214 * Add ownaddr as loopback rtentry. We previously add the route only if
215 * necessary (ex. on a p2p link). However, since we now manage addresses
216 * separately from prefixes, we should always add the route. We can't
217 * rely on the cloning mechanism from the corresponding interface route
221 in6_ifaddloop(struct ifaddr *ifa)
225 /* If there is no loopback entry, allocate one. */
226 rt = rtalloc1(ifa->ifa_addr, 0, 0);
227 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 ||
228 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
229 in6_ifloop_request(RTM_ADD, ifa);
235 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
239 in6_ifremloop(struct ifaddr *ifa)
241 struct in6_ifaddr *ia;
246 * Some of BSD variants do not remove cloned routes
247 * from an interface direct route, when removing the direct route
248 * (see comments in net/net_osdep.h). Even for variants that do remove
249 * cloned routes, they could fail to remove the cloned routes when
250 * we handle multple addresses that share a common prefix.
251 * So, we should remove the route corresponding to the deleted address
252 * regardless of the result of in6_is_ifloop_auto().
256 * Delete the entry only if exact one ifa exists. More than one ifa
257 * can exist if we assign a same single address to multiple
258 * (probably p2p) interfaces.
259 * XXX: we should avoid such a configuration in IPv6...
261 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
262 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
271 * Before deleting, check if a corresponding loopbacked host
272 * route surely exists. With this check, we can avoid to
273 * delete an interface direct route whose destination is same
274 * as the address being removed. This can happen when remofing
275 * a subnet-router anycast address on an interface attahced
276 * to a shared medium.
278 rt = rtalloc1(ifa->ifa_addr, 0, 0);
279 if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 &&
280 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
282 in6_ifloop_request(RTM_DELETE, ifa);
288 in6_ifindex2scopeid(idx)
293 struct sockaddr_in6 *sin6;
295 if (idx < 0 || if_index < idx)
297 ifp = ifindex2ifnet[idx];
299 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
301 if (ifa->ifa_addr->sa_family != AF_INET6)
303 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
304 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
305 return sin6->sin6_scope_id & 0xffff;
312 in6_mask2len(mask, lim0)
313 struct in6_addr *mask;
317 u_char *lim = lim0, *p;
320 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */
321 lim = (u_char *)mask + sizeof(*mask);
322 for (p = (u_char *)mask; p < lim; x++, p++) {
328 for (y = 0; y < 8; y++) {
329 if ((*p & (0x80 >> y)) == 0)
335 * when the limit pointer is given, do a stricter check on the
339 if (y != 0 && (*p & (0x00ff >> y)) != 0)
341 for (p = p + 1; p < lim; p++)
350 in6_len2mask(mask, len)
351 struct in6_addr *mask;
356 bzero(mask, sizeof(*mask));
357 for (i = 0; i < len / 8; i++)
358 mask->s6_addr8[i] = 0xff;
360 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff;
363 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
364 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
367 in6_control(struct socket *so, u_long cmd, caddr_t data,
368 struct ifnet *ifp, struct thread *td)
370 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
371 struct in6_ifaddr *ia = NULL;
372 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
380 case SIOCGETSGCNT_IN6:
381 case SIOCGETMIFCNT_IN6:
382 return (mrt6_ioctl(cmd, data));
389 case SIOCSNDFLUSH_IN6:
390 case SIOCSPFXFLUSH_IN6:
391 case SIOCSRTRFLUSH_IN6:
392 case SIOCSDEFIFACE_IN6:
393 case SIOCSIFINFO_FLAGS:
397 case OSIOCGIFINFO_IN6:
398 case SIOCGIFINFO_IN6:
401 case SIOCGNBRINFO_IN6:
402 case SIOCGDEFIFACE_IN6:
403 return(nd6_ioctl(cmd, data, ifp));
407 case SIOCSIFPREFIX_IN6:
408 case SIOCDIFPREFIX_IN6:
409 case SIOCAIFPREFIX_IN6:
410 case SIOCCIFPREFIX_IN6:
411 case SIOCSGIFPREFIX_IN6:
412 case SIOCGIFPREFIX_IN6:
414 "prefix ioctls are now invalidated. "
415 "please use ifconfig.\n");
423 return(scope6_set(ifp, ifr->ifr_ifru.ifru_scope_id));
426 return(scope6_get(ifp, ifr->ifr_ifru.ifru_scope_id));
429 return(scope6_get_default(ifr->ifr_ifru.ifru_scope_id));
440 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
444 * Find address for this interface, if it exists.
446 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */
447 struct sockaddr_in6 *sa6 =
448 (struct sockaddr_in6 *)&ifra->ifra_addr;
450 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
451 if (sa6->sin6_addr.s6_addr16[1] == 0) {
452 /* link ID is not embedded by the user */
453 sa6->sin6_addr.s6_addr16[1] =
454 htons(ifp->if_index);
455 } else if (sa6->sin6_addr.s6_addr16[1] !=
456 htons(ifp->if_index)) {
457 return(EINVAL); /* link ID contradicts */
459 if (sa6->sin6_scope_id) {
460 if (sa6->sin6_scope_id !=
461 (u_int32_t)ifp->if_index)
463 sa6->sin6_scope_id = 0; /* XXX: good way? */
466 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
470 case SIOCSIFADDR_IN6:
471 case SIOCSIFDSTADDR_IN6:
472 case SIOCSIFNETMASK_IN6:
474 * Since IPv6 allows a node to assign multiple addresses
475 * on a single interface, SIOCSIFxxx ioctls are not suitable
476 * and should be unused.
478 /* we decided to obsolete this command (20000704) */
481 case SIOCDIFADDR_IN6:
483 * for IPv4, we look for existing in_ifaddr here to allow
484 * "ifconfig if0 delete" to remove first IPv4 address on the
485 * interface. For IPv6, as the spec allow multiple interface
486 * address from the day one, we consider "remove the first one"
487 * semantics to be not preferable.
490 return(EADDRNOTAVAIL);
492 case SIOCAIFADDR_IN6:
494 * We always require users to specify a valid IPv6 address for
495 * the corresponding operation.
497 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
498 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
499 return(EAFNOSUPPORT);
505 case SIOCGIFADDR_IN6:
506 /* This interface is basically deprecated. use SIOCGIFCONF. */
508 case SIOCGIFAFLAG_IN6:
509 case SIOCGIFNETMASK_IN6:
510 case SIOCGIFDSTADDR_IN6:
511 case SIOCGIFALIFETIME_IN6:
512 /* must think again about its semantics */
514 return(EADDRNOTAVAIL);
516 case SIOCSIFALIFETIME_IN6:
518 struct in6_addrlifetime *lt;
523 return(EADDRNOTAVAIL);
524 /* sanity for overflow - beware unsigned */
525 lt = &ifr->ifr_ifru.ifru_lifetime;
526 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
527 && lt->ia6t_vltime + time_second < time_second) {
530 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
531 && lt->ia6t_pltime + time_second < time_second) {
540 case SIOCGIFADDR_IN6:
541 ifr->ifr_addr = ia->ia_addr;
544 case SIOCGIFDSTADDR_IN6:
545 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
548 * XXX: should we check if ifa_dstaddr is NULL and return
551 ifr->ifr_dstaddr = ia->ia_dstaddr;
554 case SIOCGIFNETMASK_IN6:
555 ifr->ifr_addr = ia->ia_prefixmask;
558 case SIOCGIFAFLAG_IN6:
559 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
562 case SIOCGIFSTAT_IN6:
565 if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax
566 || in6_ifstat[ifp->if_index] == NULL) {
567 /* return EAFNOSUPPORT? */
568 bzero(&ifr->ifr_ifru.ifru_stat,
569 sizeof(ifr->ifr_ifru.ifru_stat));
571 ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index];
574 case SIOCGIFSTAT_ICMP6:
577 if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax ||
578 icmp6_ifstat[ifp->if_index] == NULL) {
579 /* return EAFNOSUPPORT? */
580 bzero(&ifr->ifr_ifru.ifru_stat,
581 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
583 ifr->ifr_ifru.ifru_icmp6stat =
584 *icmp6_ifstat[ifp->if_index];
587 case SIOCGIFALIFETIME_IN6:
588 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
591 case SIOCSIFALIFETIME_IN6:
592 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
594 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
595 ia->ia6_lifetime.ia6t_expire =
596 time_second + ia->ia6_lifetime.ia6t_vltime;
598 ia->ia6_lifetime.ia6t_expire = 0;
599 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
600 ia->ia6_lifetime.ia6t_preferred =
601 time_second + ia->ia6_lifetime.ia6t_pltime;
603 ia->ia6_lifetime.ia6t_preferred = 0;
606 case SIOCAIFADDR_IN6:
609 struct nd_prefix pr0, *pr;
612 * first, make or update the interface address structure,
613 * and link it to the list.
615 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
619 * then, make the prefix on-link on the interface.
620 * XXX: we'd rather create the prefix before the address, but
621 * we need at least one address to install the corresponding
622 * interface route, so we configure the address first.
626 * convert mask to prefix length (prefixmask has already
627 * been validated in in6_update_ifa().
629 bzero(&pr0, sizeof(pr0));
631 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
633 if (pr0.ndpr_plen == 128)
634 break; /* we don't need to install a host route. */
635 pr0.ndpr_prefix = ifra->ifra_addr;
636 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
637 /* apply the mask for safety. */
638 for (i = 0; i < 4; i++) {
639 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
640 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
643 * XXX: since we don't have an API to set prefix (not address)
644 * lifetimes, we just use the same lifetimes as addresses.
645 * The (temporarily) installed lifetimes can be overridden by
646 * later advertised RAs (when accept_rtadv is non 0), which is
647 * an intended behavior.
649 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
651 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
652 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
653 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
655 /* add the prefix if there's one. */
656 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
658 * nd6_prelist_add will install the corresponding
661 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
664 log(LOG_ERR, "nd6_prelist_add succedded but "
666 return(EINVAL); /* XXX panic here? */
669 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr))
671 /* XXX: this should not happen! */
672 log(LOG_ERR, "in6_control: addition succeeded, but"
675 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
676 ia->ia6_ndpr == NULL) { /* new autoconfed addr */
681 * If this is the first autoconf address from
682 * the prefix, create a temporary address
683 * as well (when specified).
685 if (ip6_use_tempaddr &&
686 pr->ndpr_refcnt == 1) {
688 if ((e = in6_tmpifadd(ia, 1)) != 0) {
689 log(LOG_NOTICE, "in6_control: "
690 "failed to create a "
691 "temporary address, "
699 * this might affect the status of autoconfigured
700 * addresses, that is, this address might make
701 * other addresses detached.
703 pfxlist_onlink_check();
708 case SIOCDIFADDR_IN6:
711 struct nd_prefix pr0, *pr;
714 * If the address being deleted is the only one that owns
715 * the corresponding prefix, expire the prefix as well.
716 * XXX: theoretically, we don't have to warry about such
717 * relationship, since we separate the address management
718 * and the prefix management. We do this, however, to provide
719 * as much backward compatibility as possible in terms of
720 * the ioctl operation.
722 bzero(&pr0, sizeof(pr0));
724 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
726 if (pr0.ndpr_plen == 128)
728 pr0.ndpr_prefix = ia->ia_addr;
729 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
730 for (i = 0; i < 4; i++) {
731 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
732 ia->ia_prefixmask.sin6_addr.s6_addr32[i];
735 * The logic of the following condition is a bit complicated.
736 * We expire the prefix when
737 * 1. the address obeys autoconfiguration and it is the
738 * only owner of the associated prefix, or
739 * 2. the address does not obey autoconf and there is no
740 * other owner of the prefix.
742 if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
743 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 &&
744 pr->ndpr_refcnt == 1) ||
745 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 &&
746 pr->ndpr_refcnt == 0))) {
747 pr->ndpr_expire = 1; /* XXX: just for expiration */
751 in6_purgeaddr(&ia->ia_ifa);
756 if (ifp == NULL || ifp->if_ioctl == 0)
758 return((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred));
765 * Update parameters of an IPv6 interface address.
766 * If necessary, a new entry is created and linked into address chains.
767 * This function is separated from in6_control().
768 * XXX: should this be performed under splnet()?
771 in6_update_ifa(ifp, ifra, ia)
773 struct in6_aliasreq *ifra;
774 struct in6_ifaddr *ia;
776 int error = 0, hostIsNew = 0, plen = -1;
777 struct in6_ifaddr *oia;
778 struct sockaddr_in6 dst6;
779 struct in6_addrlifetime *lt;
781 /* Validate parameters */
782 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
786 * The destination address for a p2p link must have a family
787 * of AF_UNSPEC or AF_INET6.
789 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
790 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
791 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
792 return(EAFNOSUPPORT);
794 * validate ifra_prefixmask. don't check sin6_family, netmask
795 * does not carry fields other than sin6_len.
797 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
800 * Because the IPv6 address architecture is classless, we require
801 * users to specify a (non 0) prefix length (mask) for a new address.
802 * We also require the prefix (when specified) mask is valid, and thus
803 * reject a non-consecutive mask.
805 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
807 if (ifra->ifra_prefixmask.sin6_len != 0) {
808 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
809 (u_char *)&ifra->ifra_prefixmask +
810 ifra->ifra_prefixmask.sin6_len);
816 * In this case, ia must not be NULL. We just use its prefix
819 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
822 * If the destination address on a p2p interface is specified,
823 * and the address is a scoped one, validate/set the scope
826 dst6 = ifra->ifra_dstaddr;
827 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) &&
828 (dst6.sin6_family == AF_INET6)) {
831 #ifndef SCOPEDROUTING
832 if ((error = in6_recoverscope(&dst6,
833 &ifra->ifra_dstaddr.sin6_addr,
837 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr);
838 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
839 dst6.sin6_scope_id = scopeid;
840 else if (dst6.sin6_scope_id != scopeid)
841 return(EINVAL); /* scope ID mismatch. */
842 #ifndef SCOPEDROUTING
843 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL))
846 dst6.sin6_scope_id = 0; /* XXX */
850 * The destination address can be specified only for a p2p or a
851 * loopback interface. If specified, the corresponding prefix length
854 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
855 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
856 /* XXX: noisy message */
857 log(LOG_INFO, "in6_update_ifa: a destination can be "
858 "specified for a p2p or a loopback IF only\n");
863 * The following message seems noisy, but we dare to
864 * add it for diagnosis.
866 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 "
867 "when dstaddr is specified\n");
871 /* lifetime consistency check */
872 lt = &ifra->ifra_lifetime;
873 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
874 && lt->ia6t_vltime + time_second < time_second) {
877 if (lt->ia6t_vltime == 0) {
879 * the following log might be noisy, but this is a typical
880 * configuration mistake or a tool's bug.
883 "in6_update_ifa: valid lifetime is 0 for %s\n",
884 ip6_sprintf(&ifra->ifra_addr.sin6_addr));
886 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
887 && lt->ia6t_pltime + time_second < time_second) {
892 * If this is a new address, allocate a new ifaddr and link it
898 * When in6_update_ifa() is called in a process of a received
899 * RA, it is called under splnet(). So, we should call malloc
902 ia = (struct in6_ifaddr *)
903 malloc(sizeof(*ia), M_IFADDR, M_NOWAIT);
906 bzero((caddr_t)ia, sizeof(*ia));
907 /* Initialize the address and masks */
908 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
909 ia->ia_addr.sin6_family = AF_INET6;
910 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
911 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
913 * XXX: some functions expect that ifa_dstaddr is not
914 * NULL for p2p interfaces.
916 ia->ia_ifa.ifa_dstaddr
917 = (struct sockaddr *)&ia->ia_dstaddr;
919 ia->ia_ifa.ifa_dstaddr = NULL;
921 ia->ia_ifa.ifa_netmask
922 = (struct sockaddr *)&ia->ia_prefixmask;
925 if ((oia = in6_ifaddr) != NULL) {
926 for ( ; oia->ia_next; oia = oia->ia_next)
932 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa,
936 /* set prefix mask */
937 if (ifra->ifra_prefixmask.sin6_len) {
939 * We prohibit changing the prefix length of an existing
941 * + such an operation should be rare in IPv6, and
942 * + the operation would confuse prefix management.
944 if (ia->ia_prefixmask.sin6_len &&
945 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
946 log(LOG_INFO, "in6_update_ifa: the prefix length of an"
947 " existing (%s) address should not be changed\n",
948 ip6_sprintf(&ia->ia_addr.sin6_addr));
952 ia->ia_prefixmask = ifra->ifra_prefixmask;
956 * If a new destination address is specified, scrub the old one and
957 * install the new destination. Note that the interface must be
958 * p2p or loopback (see the check above.)
960 if (dst6.sin6_family == AF_INET6 &&
961 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
962 &ia->ia_dstaddr.sin6_addr)) {
965 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
966 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
968 log(LOG_ERR, "in6_update_ifa: failed to remove "
969 "a route to the old destination: %s\n",
970 ip6_sprintf(&ia->ia_addr.sin6_addr));
971 /* proceed anyway... */
974 ia->ia_flags &= ~IFA_ROUTE;
975 ia->ia_dstaddr = dst6;
978 /* reset the interface and routing table appropriately. */
979 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
983 * Beyond this point, we should call in6_purgeaddr upon an error,
984 * not just go to unlink.
987 #if 0 /* disable this mechanism for now */
988 /* update prefix list */
990 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */
993 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen;
994 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) {
995 in6_purgeaddr((struct ifaddr *)ia);
1001 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1002 struct sockaddr_in6 mltaddr, mltmask;
1003 struct in6_multi *in6m;
1007 * join solicited multicast addr for new host id
1009 struct in6_addr llsol;
1010 bzero(&llsol, sizeof(struct in6_addr));
1011 llsol.s6_addr16[0] = htons(0xff02);
1012 llsol.s6_addr16[1] = htons(ifp->if_index);
1013 llsol.s6_addr32[1] = 0;
1014 llsol.s6_addr32[2] = htonl(1);
1015 llsol.s6_addr32[3] =
1016 ifra->ifra_addr.sin6_addr.s6_addr32[3];
1017 llsol.s6_addr8[12] = 0xff;
1018 (void)in6_addmulti(&llsol, ifp, &error);
1021 "in6_update_ifa: addmulti failed for "
1022 "%s on %s (errno=%d)\n",
1023 ip6_sprintf(&llsol), if_name(ifp),
1025 in6_purgeaddr((struct ifaddr *)ia);
1030 bzero(&mltmask, sizeof(mltmask));
1031 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1032 mltmask.sin6_family = AF_INET6;
1033 mltmask.sin6_addr = in6mask32;
1036 * join link-local all-nodes address
1038 bzero(&mltaddr, sizeof(mltaddr));
1039 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1040 mltaddr.sin6_family = AF_INET6;
1041 mltaddr.sin6_addr = in6addr_linklocal_allnodes;
1042 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1044 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
1047 (struct sockaddr *)&mltaddr,
1048 (struct sockaddr *)&ia->ia_addr,
1049 (struct sockaddr *)&mltmask,
1050 RTF_UP|RTF_CLONING, /* xxx */
1051 (struct rtentry **)0);
1052 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
1055 "in6_update_ifa: addmulti failed for "
1056 "%s on %s (errno=%d)\n",
1057 ip6_sprintf(&mltaddr.sin6_addr),
1058 if_name(ifp), error);
1063 * join node information group address
1065 #define hostnamelen strlen(hostname)
1066 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1068 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
1069 if (in6m == NULL && ia != NULL) {
1070 (void)in6_addmulti(&mltaddr.sin6_addr,
1073 log(LOG_WARNING, "in6_update_ifa: "
1074 "addmulti failed for "
1075 "%s on %s (errno=%d)\n",
1076 ip6_sprintf(&mltaddr.sin6_addr),
1077 if_name(ifp), error);
1084 * join node-local all-nodes address, on loopback.
1085 * XXX: since "node-local" is obsoleted by interface-local,
1086 * we have to join the group on every interface with
1087 * some interface-boundary restriction.
1089 if (ifp->if_flags & IFF_LOOPBACK) {
1090 struct in6_ifaddr *ia_loop;
1092 struct in6_addr loop6 = in6addr_loopback;
1093 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6);
1095 mltaddr.sin6_addr = in6addr_nodelocal_allnodes;
1097 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
1098 if (in6m == NULL && ia_loop != NULL) {
1100 (struct sockaddr *)&mltaddr,
1101 (struct sockaddr *)&ia_loop->ia_addr,
1102 (struct sockaddr *)&mltmask,
1104 (struct rtentry **)0);
1105 (void)in6_addmulti(&mltaddr.sin6_addr, ifp,
1108 log(LOG_WARNING, "in6_update_ifa: "
1109 "addmulti failed for %s on %s "
1111 ip6_sprintf(&mltaddr.sin6_addr),
1112 if_name(ifp), error);
1118 ia->ia6_flags = ifra->ifra_flags;
1119 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/
1120 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */
1122 ia->ia6_lifetime = ifra->ifra_lifetime;
1124 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1125 ia->ia6_lifetime.ia6t_expire =
1126 time_second + ia->ia6_lifetime.ia6t_vltime;
1128 ia->ia6_lifetime.ia6t_expire = 0;
1129 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1130 ia->ia6_lifetime.ia6t_preferred =
1131 time_second + ia->ia6_lifetime.ia6t_pltime;
1133 ia->ia6_lifetime.ia6t_preferred = 0;
1136 * make sure to initialize ND6 information. this is to workaround
1137 * issues with interfaces with IPv6 addresses, which have never brought
1138 * up. We are assuming that it is safe to nd6_ifattach multiple times.
1143 * Perform DAD, if needed.
1144 * XXX It may be of use, if we can administratively
1147 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) {
1148 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1149 nd6_dad_start((struct ifaddr *)ia, NULL);
1156 * XXX: if a change of an existing address failed, keep the entry
1160 in6_unlink_ifa(ia, ifp);
1168 struct ifnet *ifp = ifa->ifa_ifp;
1169 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1171 /* stop DAD processing */
1175 * delete route to the destination of the address being purged.
1176 * The interface must be p2p or loopback in this case.
1178 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) {
1181 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1183 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1184 "a route to the p2p destination: %s on %s, "
1186 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1188 /* proceed anyway... */
1191 ia->ia_flags &= ~IFA_ROUTE;
1194 /* Remove ownaddr's loopback rtentry, if it exists. */
1195 in6_ifremloop(&(ia->ia_ifa));
1197 if (ifp->if_flags & IFF_MULTICAST) {
1199 * delete solicited multicast addr for deleting host id
1201 struct in6_multi *in6m;
1202 struct in6_addr llsol;
1203 bzero(&llsol, sizeof(struct in6_addr));
1204 llsol.s6_addr16[0] = htons(0xff02);
1205 llsol.s6_addr16[1] = htons(ifp->if_index);
1206 llsol.s6_addr32[1] = 0;
1207 llsol.s6_addr32[2] = htonl(1);
1208 llsol.s6_addr32[3] =
1209 ia->ia_addr.sin6_addr.s6_addr32[3];
1210 llsol.s6_addr8[12] = 0xff;
1212 IN6_LOOKUP_MULTI(llsol, ifp, in6m);
1217 in6_unlink_ifa(ia, ifp);
1221 in6_unlink_ifa(ia, ifp)
1222 struct in6_ifaddr *ia;
1226 struct in6_ifaddr *oia;
1229 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list);
1232 if (oia == (ia = in6_ifaddr))
1233 in6_ifaddr = ia->ia_next;
1235 while (ia->ia_next && (ia->ia_next != oia))
1238 ia->ia_next = oia->ia_next;
1241 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1245 if (oia->ia6_ifpr) { /* check for safety */
1246 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL);
1247 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen;
1248 in6_prefix_remove_ifid(iilen, oia);
1252 * When an autoconfigured address is being removed, release the
1253 * reference to the base prefix. Also, since the release might
1254 * affect the status of other (detached) addresses, call
1255 * pfxlist_onlink_check().
1257 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) {
1258 if (oia->ia6_ndpr == NULL) {
1259 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
1260 "%p has no prefix\n", oia);
1262 oia->ia6_ndpr->ndpr_refcnt--;
1263 oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
1264 oia->ia6_ndpr = NULL;
1267 pfxlist_onlink_check();
1271 * release another refcnt for the link from in6_ifaddr.
1272 * Note that we should decrement the refcnt at least once for all *BSD.
1274 IFAFREE(&oia->ia_ifa);
1283 struct ifaddr *ifa, *nifa;
1285 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa)
1287 nifa = TAILQ_NEXT(ifa, ifa_list);
1288 if (ifa->ifa_addr->sa_family != AF_INET6)
1298 * SIOCGLIFADDR: get first address. (?)
1299 * SIOCGLIFADDR with IFLR_PREFIX:
1300 * get first address that matches the specified prefix.
1301 * SIOCALIFADDR: add the specified address.
1302 * SIOCALIFADDR with IFLR_PREFIX:
1303 * add the specified prefix, filling hostid part from
1304 * the first link-local address. prefixlen must be <= 64.
1305 * SIOCDLIFADDR: delete the specified address.
1306 * SIOCDLIFADDR with IFLR_PREFIX:
1307 * delete the first address that matches the specified prefix.
1309 * EINVAL on invalid parameters
1310 * EADDRNOTAVAIL on prefix match failed/specified address not found
1311 * other values may be returned from in6_ioctl()
1313 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1314 * this is to accomodate address naming scheme other than RFC2374,
1316 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1317 * address encoding scheme. (see figure on page 8)
1320 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1321 struct ifnet *ifp, struct thread *td)
1323 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1325 struct sockaddr *sa;
1328 if (!data || !ifp) {
1329 panic("invalid argument to in6_lifaddr_ioctl");
1335 /* address must be specified on GET with IFLR_PREFIX */
1336 if ((iflr->flags & IFLR_PREFIX) == 0)
1341 /* address must be specified on ADD and DELETE */
1342 sa = (struct sockaddr *)&iflr->addr;
1343 if (sa->sa_family != AF_INET6)
1345 if (sa->sa_len != sizeof(struct sockaddr_in6))
1347 /* XXX need improvement */
1348 sa = (struct sockaddr *)&iflr->dstaddr;
1349 if (sa->sa_family && sa->sa_family != AF_INET6)
1351 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1354 default: /* shouldn't happen */
1356 panic("invalid cmd to in6_lifaddr_ioctl");
1362 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1368 struct in6_aliasreq ifra;
1369 struct in6_addr *hostid = NULL;
1372 if ((iflr->flags & IFLR_PREFIX) != 0) {
1373 struct sockaddr_in6 *sin6;
1376 * hostid is to fill in the hostid part of the
1377 * address. hostid points to the first link-local
1378 * address attached to the interface.
1380 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1382 return EADDRNOTAVAIL;
1383 hostid = IFA_IN6(ifa);
1385 /* prefixlen must be <= 64. */
1386 if (64 < iflr->prefixlen)
1388 prefixlen = iflr->prefixlen;
1390 /* hostid part must be zero. */
1391 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1392 if (sin6->sin6_addr.s6_addr32[2] != 0
1393 || sin6->sin6_addr.s6_addr32[3] != 0) {
1397 prefixlen = iflr->prefixlen;
1399 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1400 bzero(&ifra, sizeof(ifra));
1401 bcopy(iflr->iflr_name, ifra.ifra_name,
1402 sizeof(ifra.ifra_name));
1404 bcopy(&iflr->addr, &ifra.ifra_addr,
1405 ((struct sockaddr *)&iflr->addr)->sa_len);
1407 /* fill in hostid part */
1408 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1409 hostid->s6_addr32[2];
1410 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1411 hostid->s6_addr32[3];
1414 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/
1415 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1416 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1418 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1419 hostid->s6_addr32[2];
1420 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1421 hostid->s6_addr32[3];
1425 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1426 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1428 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1429 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1434 struct in6_ifaddr *ia;
1435 struct in6_addr mask, candidate, match;
1436 struct sockaddr_in6 *sin6;
1439 bzero(&mask, sizeof(mask));
1440 if (iflr->flags & IFLR_PREFIX) {
1441 /* lookup a prefix rather than address. */
1442 in6_len2mask(&mask, iflr->prefixlen);
1444 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1445 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1446 match.s6_addr32[0] &= mask.s6_addr32[0];
1447 match.s6_addr32[1] &= mask.s6_addr32[1];
1448 match.s6_addr32[2] &= mask.s6_addr32[2];
1449 match.s6_addr32[3] &= mask.s6_addr32[3];
1451 /* if you set extra bits, that's wrong */
1452 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1457 if (cmd == SIOCGLIFADDR) {
1458 /* on getting an address, take the 1st match */
1461 /* on deleting an address, do exact match */
1462 in6_len2mask(&mask, 128);
1463 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1464 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1470 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1472 if (ifa->ifa_addr->sa_family != AF_INET6)
1477 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1478 #ifndef SCOPEDROUTING
1480 * XXX: this is adhoc, but is necessary to allow
1481 * a user to specify fe80::/64 (not /10) for a
1482 * link-local address.
1484 if (IN6_IS_ADDR_LINKLOCAL(&candidate))
1485 candidate.s6_addr16[1] = 0;
1487 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1488 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1489 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1490 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1491 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1495 return EADDRNOTAVAIL;
1498 if (cmd == SIOCGLIFADDR) {
1499 #ifndef SCOPEDROUTING
1500 struct sockaddr_in6 *s6;
1503 /* fill in the if_laddrreq structure */
1504 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1505 #ifndef SCOPEDROUTING /* XXX see above */
1506 s6 = (struct sockaddr_in6 *)&iflr->addr;
1507 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1508 s6->sin6_addr.s6_addr16[1] = 0;
1510 in6_addr2scopeid(ifp, &s6->sin6_addr);
1513 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1514 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1515 ia->ia_dstaddr.sin6_len);
1516 #ifndef SCOPEDROUTING /* XXX see above */
1517 s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
1518 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1519 s6->sin6_addr.s6_addr16[1] = 0;
1521 in6_addr2scopeid(ifp,
1526 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1529 in6_mask2len(&ia->ia_prefixmask.sin6_addr,
1532 iflr->flags = ia->ia6_flags; /* XXX */
1536 struct in6_aliasreq ifra;
1538 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1539 bzero(&ifra, sizeof(ifra));
1540 bcopy(iflr->iflr_name, ifra.ifra_name,
1541 sizeof(ifra.ifra_name));
1543 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1544 ia->ia_addr.sin6_len);
1545 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
1546 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1547 ia->ia_dstaddr.sin6_len);
1549 bzero(&ifra.ifra_dstaddr,
1550 sizeof(ifra.ifra_dstaddr));
1552 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1553 ia->ia_prefixmask.sin6_len);
1555 ifra.ifra_flags = ia->ia6_flags;
1556 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1562 return EOPNOTSUPP; /* just for safety */
1566 * Initialize an interface's intetnet6 address
1567 * and routing table entry.
1570 in6_ifinit(ifp, ia, sin6, newhost)
1572 struct in6_ifaddr *ia;
1573 struct sockaddr_in6 *sin6;
1576 int error = 0, plen, ifacount = 0;
1581 * Give the interface a chance to initialize
1582 * if this is its first address,
1583 * and to validate the address if necessary.
1585 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1587 if (ifa->ifa_addr == NULL)
1588 continue; /* just for safety */
1589 if (ifa->ifa_addr->sa_family != AF_INET6)
1594 ia->ia_addr = *sin6;
1596 if (ifacount <= 1 && ifp->if_ioctl &&
1597 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia,
1598 (struct ucred *)NULL))) {
1604 ia->ia_ifa.ifa_metric = ifp->if_metric;
1606 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1610 * If the destination address is specified for a point-to-point
1611 * interface, install a route to the destination as an interface
1614 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1615 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
1616 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
1617 RTF_UP | RTF_HOST)) != 0)
1619 ia->ia_flags |= IFA_ROUTE;
1623 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1625 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1628 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1630 /* set the rtrequest function to create llinfo */
1631 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1632 in6_ifaddloop(&(ia->ia_ifa));
1639 * Add an address to the list of IP6 multicast addresses for a
1643 in6_addmulti(maddr6, ifp, errorp)
1644 struct in6_addr *maddr6;
1648 struct in6_multi *in6m;
1649 struct sockaddr_in6 sin6;
1650 struct ifmultiaddr *ifma;
1656 * Call generic routine to add membership or increment
1657 * refcount. It wants addresses in the form of a sockaddr,
1658 * so we build one here (being careful to zero the unused bytes).
1660 bzero(&sin6, sizeof sin6);
1661 sin6.sin6_family = AF_INET6;
1662 sin6.sin6_len = sizeof sin6;
1663 sin6.sin6_addr = *maddr6;
1664 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma);
1671 * If ifma->ifma_protospec is null, then if_addmulti() created
1672 * a new record. Otherwise, we are done.
1674 if (ifma->ifma_protospec != 0)
1675 return ifma->ifma_protospec;
1677 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
1678 at interrupt time? If so, need to fix if_addmulti. XXX */
1679 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
1685 bzero(in6m, sizeof *in6m);
1686 in6m->in6m_addr = *maddr6;
1687 in6m->in6m_ifp = ifp;
1688 in6m->in6m_ifma = ifma;
1689 ifma->ifma_protospec = in6m;
1690 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry);
1693 * Let MLD6 know that we have joined a new IP6 multicast
1696 mld6_start_listening(in6m);
1702 * Delete a multicast address record.
1706 struct in6_multi *in6m;
1708 struct ifmultiaddr *ifma = in6m->in6m_ifma;
1711 if (ifma->ifma_refcount == 1) {
1713 * No remaining claims to this record; let MLD6 know
1714 * that we are leaving the multicast group.
1716 mld6_stop_listening(in6m);
1717 ifma->ifma_protospec = 0;
1718 LIST_REMOVE(in6m, in6m_entry);
1719 free(in6m, M_IPMADDR);
1721 /* XXX - should be separate API for when we have an ifma? */
1722 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1727 * Find an IPv6 interface link-local address specific to an interface.
1730 in6ifa_ifpforlinklocal(ifp, ignoreflags)
1736 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1738 if (ifa->ifa_addr == NULL)
1739 continue; /* just for safety */
1740 if (ifa->ifa_addr->sa_family != AF_INET6)
1742 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1743 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1750 return((struct in6_ifaddr *)ifa);
1755 * find the internet address corresponding to a given interface and address.
1758 in6ifa_ifpwithaddr(ifp, addr)
1760 struct in6_addr *addr;
1764 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1766 if (ifa->ifa_addr == NULL)
1767 continue; /* just for safety */
1768 if (ifa->ifa_addr->sa_family != AF_INET6)
1770 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1774 return((struct in6_ifaddr *)ifa);
1778 * Convert IP6 address to printable (loggable) representation.
1780 static char digits[] = "0123456789abcdef";
1781 static int ip6round = 0;
1784 const struct in6_addr *addr;
1786 static char ip6buf[8][48];
1789 const u_short *a = (const u_short *)addr;
1793 ip6round = (ip6round + 1) & 7;
1794 cp = ip6buf[ip6round];
1796 for (i = 0; i < 8; i++) {
1807 if (dcolon == 0 && *(a + 1) == 0) {
1819 d = (const u_char *)a;
1820 *cp++ = digits[*d >> 4];
1821 *cp++ = digits[*d++ & 0xf];
1822 *cp++ = digits[*d >> 4];
1823 *cp++ = digits[*d & 0xf];
1828 return(ip6buf[ip6round]);
1833 struct in6_addr *in6;
1835 struct in6_ifaddr *ia;
1837 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1840 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
1841 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1842 &ia->ia_prefixmask.sin6_addr))
1849 in6_is_addr_deprecated(sa6)
1850 struct sockaddr_in6 *sa6;
1852 struct in6_ifaddr *ia;
1854 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1855 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1857 #ifdef SCOPEDROUTING
1858 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id &&
1860 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0)
1861 return(1); /* true */
1863 /* XXX: do we still have to go thru the rest of the list? */
1866 return(0); /* false */
1870 * return length of part which dst and src are equal
1874 in6_matchlen(src, dst)
1875 struct in6_addr *src, *dst;
1878 u_char *s = (u_char *)src, *d = (u_char *)dst;
1879 u_char *lim = s + 16, r;
1882 if ((r = (*d++ ^ *s++)) != 0) {
1893 /* XXX: to be scope conscious */
1895 in6_are_prefix_equal(p1, p2, len)
1896 struct in6_addr *p1, *p2;
1899 int bytelen, bitlen;
1902 if (0 > len || len > 128) {
1903 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1911 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1913 if (p1->s6_addr[bytelen] >> (8 - bitlen) !=
1914 p2->s6_addr[bytelen] >> (8 - bitlen))
1921 in6_prefixlen2mask(maskp, len)
1922 struct in6_addr *maskp;
1925 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1926 int bytelen, bitlen, i;
1929 if (0 > len || len > 128) {
1930 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1935 bzero(maskp, sizeof(*maskp));
1938 for (i = 0; i < bytelen; i++)
1939 maskp->s6_addr[i] = 0xff;
1941 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1945 * return the best address out of the same scope
1948 in6_ifawithscope(oifp, dst)
1950 struct in6_addr *dst;
1952 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0;
1956 struct in6_ifaddr *ifa_best = NULL;
1960 printf("in6_ifawithscope: output interface is not specified\n");
1966 * We search for all addresses on all interfaces from the beginning.
1967 * Comparing an interface with the outgoing interface will be done
1968 * only at the final stage of tiebreaking.
1970 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1973 * We can never take an address that breaks the scope zone
1974 * of the destination.
1976 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst))
1979 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1981 int tlen = -1, dscopecmp, bscopecmp, matchcmp;
1983 if (ifa->ifa_addr->sa_family != AF_INET6)
1986 src_scope = in6_addrscope(IFA_IN6(ifa));
1989 * Don't use an address before completing DAD
1990 * nor a duplicated address.
1992 if (((struct in6_ifaddr *)ifa)->ia6_flags &
1996 /* XXX: is there any case to allow anycasts? */
1997 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2001 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2006 * If this is the first address we find,
2009 if (ifa_best == NULL)
2013 * ifa_best is never NULL beyond this line except
2014 * within the block labeled "replace".
2018 * If ifa_best has a smaller scope than dst and
2019 * the current address has a larger one than
2020 * (or equal to) dst, always replace ifa_best.
2021 * Also, if the current address has a smaller scope
2022 * than dst, ignore it unless ifa_best also has a
2024 * Consequently, after the two if-clause below,
2025 * the followings must be satisfied:
2026 * (scope(src) < scope(dst) &&
2027 * scope(best) < scope(dst))
2029 * (scope(best) >= scope(dst) &&
2030 * scope(src) >= scope(dst))
2032 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
2033 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
2034 goto replace; /* (A) */
2035 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
2036 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
2040 * A deprecated address SHOULD NOT be used in new
2041 * communications if an alternate (non-deprecated)
2042 * address is available and has sufficient scope.
2043 * RFC 2462, Section 5.5.4.
2045 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2046 IN6_IFF_DEPRECATED) {
2048 * Ignore any deprecated addresses if
2049 * specified by configuration.
2051 if (!ip6_use_deprecated)
2055 * If we have already found a non-deprecated
2056 * candidate, just ignore deprecated addresses.
2058 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED)
2064 * A non-deprecated address is always preferred
2065 * to a deprecated one regardless of scopes and
2066 * address matching (Note invariants ensured by the
2067 * conditions (A) and (B) above.)
2069 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
2070 (((struct in6_ifaddr *)ifa)->ia6_flags &
2071 IN6_IFF_DEPRECATED) == 0)
2075 * When we use temporary addresses described in
2076 * RFC 3041, we prefer temporary addresses to
2077 * public autoconf addresses. Again, note the
2078 * invariants from (A) and (B). Also note that we
2079 * don't have any preference between static addresses
2080 * and autoconf addresses (despite of whether or not
2081 * the latter is temporary or public.)
2083 if (ip6_use_tempaddr) {
2084 struct in6_ifaddr *ifat;
2086 ifat = (struct in6_ifaddr *)ifa;
2087 if ((ifa_best->ia6_flags &
2088 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2089 == IN6_IFF_AUTOCONF &&
2091 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2092 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) {
2095 if ((ifa_best->ia6_flags &
2096 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2097 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) &&
2099 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2100 == IN6_IFF_AUTOCONF) {
2106 * At this point, we have two cases:
2107 * 1. we are looking at a non-deprecated address,
2108 * and ifa_best is also non-deprecated.
2109 * 2. we are looking at a deprecated address,
2110 * and ifa_best is also deprecated.
2111 * Also, we do not have to consider a case where
2112 * the scope of if_best is larger(smaller) than dst and
2113 * the scope of the current address is smaller(larger)
2114 * than dst. Such a case has already been covered.
2115 * Tiebreaking is done according to the following
2117 * - the scope comparison between the address and
2119 * - the scope comparison between the address and
2120 * ifa_best (bscopecmp)
2121 * - if the address match dst longer than ifa_best
2123 * - if the address is on the outgoing I/F (outI/F)
2125 * Roughly speaking, the selection policy is
2126 * - the most important item is scope. The same scope
2127 * is best. Then search for a larger scope.
2128 * Smaller scopes are the last resort.
2129 * - A deprecated address is chosen only when we have
2130 * no address that has an enough scope, but is
2131 * prefered to any addresses of smaller scopes
2132 * (this must be already done above.)
2133 * - addresses on the outgoing I/F are preferred to
2134 * ones on other interfaces if none of above
2135 * tiebreaks. In the table below, the column "bI"
2136 * means if the best_ifa is on the outgoing
2137 * interface, and the column "sI" means if the ifa
2138 * is on the outgoing interface.
2139 * - If there is no other reasons to choose one,
2140 * longest address match against dst is considered.
2142 * The precise decision table is as follows:
2143 * dscopecmp bscopecmp match bI oI | replace?
2144 * N/A equal N/A Y N | No (1)
2145 * N/A equal N/A N Y | Yes (2)
2146 * N/A equal larger N/A | Yes (3)
2147 * N/A equal !larger N/A | No (4)
2148 * larger larger N/A N/A | No (5)
2149 * larger smaller N/A N/A | Yes (6)
2150 * smaller larger N/A N/A | Yes (7)
2151 * smaller smaller N/A N/A | No (8)
2152 * equal smaller N/A N/A | Yes (9)
2153 * equal larger (already done at A above)
2155 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
2156 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
2158 if (bscopecmp == 0) {
2159 struct ifnet *bifp = ifa_best->ia_ifp;
2161 if (bifp == oifp && ifp != oifp) /* (1) */
2163 if (bifp != oifp && ifp == oifp) /* (2) */
2167 * Both bifp and ifp are on the outgoing
2168 * interface, or both two are on a different
2169 * interface from the outgoing I/F.
2170 * now we need address matching against dst
2173 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2174 matchcmp = tlen - blen;
2175 if (matchcmp > 0) /* (3) */
2179 if (dscopecmp > 0) {
2180 if (bscopecmp > 0) /* (5) */
2182 goto replace; /* (6) */
2184 if (dscopecmp < 0) {
2185 if (bscopecmp > 0) /* (7) */
2190 /* now dscopecmp must be 0 */
2192 goto replace; /* (9) */
2195 ifa_best = (struct in6_ifaddr *)ifa;
2196 blen = tlen >= 0 ? tlen :
2197 in6_matchlen(IFA_IN6(ifa), dst);
2198 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr);
2202 /* count statistics for future improvements */
2203 if (ifa_best == NULL)
2204 ip6stat.ip6s_sources_none++;
2206 if (oifp == ifa_best->ia_ifp)
2207 ip6stat.ip6s_sources_sameif[best_scope]++;
2209 ip6stat.ip6s_sources_otherif[best_scope]++;
2211 if (best_scope == dst_scope)
2212 ip6stat.ip6s_sources_samescope[best_scope]++;
2214 ip6stat.ip6s_sources_otherscope[best_scope]++;
2216 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0)
2217 ip6stat.ip6s_sources_deprecated[best_scope]++;
2224 * return the best address out of the same scope. if no address was
2225 * found, return the first valid address from designated IF.
2228 in6_ifawithifp(ifp, dst)
2230 struct in6_addr *dst;
2232 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2234 struct in6_ifaddr *besta = 0;
2235 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2237 dep[0] = dep[1] = NULL;
2240 * We first look for addresses in the same scope.
2241 * If there is one, return it.
2242 * If two or more, return one which matches the dst longest.
2243 * If none, return one of global addresses assigned other ifs.
2245 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
2247 if (ifa->ifa_addr->sa_family != AF_INET6)
2249 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2250 continue; /* XXX: is there any case to allow anycast? */
2251 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2252 continue; /* don't use this interface */
2253 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2255 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2256 if (ip6_use_deprecated)
2257 dep[0] = (struct in6_ifaddr *)ifa;
2261 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2263 * call in6_matchlen() as few as possible
2267 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2268 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2271 besta = (struct in6_ifaddr *)ifa;
2274 besta = (struct in6_ifaddr *)ifa;
2280 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
2282 if (ifa->ifa_addr->sa_family != AF_INET6)
2284 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2285 continue; /* XXX: is there any case to allow anycast? */
2286 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2287 continue; /* don't use this interface */
2288 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2290 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2291 if (ip6_use_deprecated)
2292 dep[1] = (struct in6_ifaddr *)ifa;
2296 return (struct in6_ifaddr *)ifa;
2299 /* use the last-resort values, that are, deprecated addresses */
2309 * perform DAD when interface becomes IFF_UP.
2316 struct in6_ifaddr *ia;
2317 int dad_delay; /* delay ticks before DAD output */
2320 * special cases, like 6to4, are handled in in6_ifattach
2322 in6_ifattach(ifp, NULL);
2325 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
2327 if (ifa->ifa_addr->sa_family != AF_INET6)
2329 ia = (struct in6_ifaddr *)ifa;
2330 if (ia->ia6_flags & IN6_IFF_TENTATIVE)
2331 nd6_dad_start(ifa, &dad_delay);
2339 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2342 switch (ifp->if_type) {
2348 * These interfaces do not have the IFF_LOOPBACK flag,
2349 * but loop packets back. We do not have to do DAD on such
2350 * interfaces. We should even omit it, because loop-backed
2351 * NS would confuse the DAD procedure.
2356 * Our DAD routine requires the interface up and running.
2357 * However, some interfaces can be up before the RUNNING
2358 * status. Additionaly, users may try to assign addresses
2359 * before the interface becomes up (or running).
2360 * We simply skip DAD in such a case as a work around.
2361 * XXX: we should rather mark "tentative" on such addresses,
2362 * and do DAD after the interface becomes ready.
2364 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
2365 (IFF_UP|IFF_RUNNING))
2373 * Calculate max IPv6 MTU through all the interfaces and store it
2379 unsigned long maxmtu = 0;
2382 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2384 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2385 nd_ifinfo[ifp->if_index].linkmtu > maxmtu)
2386 maxmtu = nd_ifinfo[ifp->if_index].linkmtu;
2388 if (maxmtu) /* update only when maxmtu is positive */
2389 in6_maxmtu = maxmtu;
2393 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2394 * v4 mapped addr or v4 compat addr
2397 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2399 bzero(sin, sizeof(*sin));
2400 sin->sin_len = sizeof(struct sockaddr_in);
2401 sin->sin_family = AF_INET;
2402 sin->sin_port = sin6->sin6_port;
2403 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2406 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2408 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2410 bzero(sin6, sizeof(*sin6));
2411 sin6->sin6_len = sizeof(struct sockaddr_in6);
2412 sin6->sin6_family = AF_INET6;
2413 sin6->sin6_port = sin->sin_port;
2414 sin6->sin6_addr.s6_addr32[0] = 0;
2415 sin6->sin6_addr.s6_addr32[1] = 0;
2416 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2417 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2420 /* Convert sockaddr_in6 into sockaddr_in. */
2422 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2424 struct sockaddr_in *sin_p;
2425 struct sockaddr_in6 sin6;
2428 * Save original sockaddr_in6 addr and convert it
2431 sin6 = *(struct sockaddr_in6 *)nam;
2432 sin_p = (struct sockaddr_in *)nam;
2433 in6_sin6_2_sin(sin_p, &sin6);
2436 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */
2438 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam)
2440 struct sockaddr_in *sin_p;
2441 struct sockaddr_in6 *sin6_p;
2443 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
2445 sin_p = (struct sockaddr_in *)*nam;
2446 in6_sin_2_v4mapsin6(sin_p, sin6_p);
2447 FREE(*nam, M_SONAME);
2448 *nam = (struct sockaddr *)sin6_p;