1 /* $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $ */
2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
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21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1982, 1986, 1991, 1993
35 * The Regents of the University of California. All rights reserved.
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
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46 * may be used to endorse or promote products derived from this software
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51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * @(#)in.c 8.2 (Berkeley) 11/15/93
65 #include "opt_inet6.h"
67 #include <sys/param.h>
68 #include <sys/errno.h>
69 #include <sys/malloc.h>
70 #include <sys/socket.h>
71 #include <sys/socketvar.h>
72 #include <sys/sockio.h>
73 #include <sys/systm.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
85 #include <net/if_types.h>
86 #include <net/route.h>
87 #include <net/if_dl.h>
88 #include <net/netmsg2.h>
89 #include <net/netisr2.h>
91 #include <netinet/in.h>
92 #include <netinet/in_var.h>
93 #include <netinet/if_ether.h>
94 #include <netinet/in_systm.h>
95 #include <netinet/ip.h>
96 #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 #include <netinet6/in6_pcb.h>
106 #include <netinet6/in6_var.h>
108 #include <net/net_osdep.h>
111 * Definitions of some costant IP6 addresses.
113 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT;
114 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT;
115 const struct in6_addr kin6addr_nodelocal_allnodes =
116 IN6ADDR_NODELOCAL_ALLNODES_INIT;
117 const struct in6_addr kin6addr_linklocal_allnodes =
118 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
119 const struct in6_addr kin6addr_linklocal_allrouters =
120 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
122 const struct in6_addr in6mask0 = IN6MASK0;
123 const struct in6_addr in6mask32 = IN6MASK32;
124 const struct in6_addr in6mask64 = IN6MASK64;
125 const struct in6_addr in6mask96 = IN6MASK96;
126 const struct in6_addr in6mask128 = IN6MASK128;
128 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6,
129 0, 0, IN6ADDR_ANY_INIT, 0};
131 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t,
132 struct ifnet *, struct thread *);
133 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *,
134 struct sockaddr_in6 *, int);
135 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *);
136 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *);
138 static void in6_control_internal_dispatch(netmsg_t);
139 static int in6_control_internal(u_long, caddr_t, struct ifnet *,
142 struct in6_multihead in6_multihead; /* XXX BSS initialization */
144 int (*faithprefix_p)(struct in6_addr *);
147 * Subroutine for in6_ifaddloop() and in6_ifremloop().
148 * This routine does actual work.
151 in6_ifloop_request(int cmd, struct ifaddr *ifa)
153 struct sockaddr_in6 all1_sa;
154 struct rt_addrinfo rtinfo;
157 bzero(&all1_sa, sizeof(all1_sa));
158 all1_sa.sin6_family = AF_INET6;
159 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
160 all1_sa.sin6_addr = in6mask128;
163 * We specify the address itself as the gateway, and set the
164 * RTF_LLINFO flag, so that the corresponding host route would have
165 * the flag, and thus applications that assume traditional behavior
166 * would be happy. Note that we assume the caller of the function
167 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest,
168 * which changes the outgoing interface to the loopback interface.
170 bzero(&rtinfo, sizeof(struct rt_addrinfo));
171 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr;
172 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
173 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa;
174 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO;
176 error = rtrequest1_global(cmd, &rtinfo,
177 in6_ifloop_request_callback, ifa, RTREQ_PRIO_NORM);
179 log(LOG_ERR, "in6_ifloop_request: "
180 "%s operation failed for %s (errno=%d)\n",
181 cmd == RTM_ADD ? "ADD" : "DELETE",
182 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr),
188 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo,
189 struct rtentry *rt, void *arg)
191 struct ifaddr *ifa = arg;
197 * Make sure rt_ifa be equal to IFA, the second argument of the
199 * We need this because when we refer to rt_ifa->ia6_flags in
200 * ip6_input, we assume that the rt_ifa points to the address instead
201 * of the loopback address.
203 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) {
212 * Report the addition/removal of the address to the routing socket.
213 * XXX: since we called rtinit for a p2p interface with a destination,
214 * we end up reporting twice in such a case. Should we rather
215 * omit the second report?
219 rt_newaddrmsg(cmd, ifa, error, rt);
220 if (cmd == RTM_DELETE) {
221 if (rt->rt_refcnt == 0) {
228 /* no way to return any new error */
233 * Add ownaddr as loopback rtentry. We previously add the route only if
234 * necessary (ex. on a p2p link). However, since we now manage addresses
235 * separately from prefixes, we should always add the route. We can't
236 * rely on the cloning mechanism from the corresponding interface route
240 in6_ifaddloop(struct ifaddr *ifa)
244 /* If there is no loopback entry, allocate one. */
245 rt = rtpurelookup(ifa->ifa_addr);
246 if (rt == NULL || !(rt->rt_flags & RTF_HOST) ||
247 !(rt->rt_ifp->if_flags & IFF_LOOPBACK))
248 in6_ifloop_request(RTM_ADD, ifa);
254 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(),
258 in6_ifremloop(struct ifaddr *ifa)
260 struct in6_ifaddr *ia;
265 * Some of BSD variants do not remove cloned routes
266 * from an interface direct route, when removing the direct route
267 * (see comments in net/net_osdep.h). Even for variants that do remove
268 * cloned routes, they could fail to remove the cloned routes when
269 * we handle multple addresses that share a common prefix.
270 * So, we should remove the route corresponding to the deleted address
271 * regardless of the result of in6_is_ifloop_auto().
275 * Delete the entry only if exact one ifa exists. More than one ifa
276 * can exist if we assign a same single address to multiple
277 * (probably p2p) interfaces.
278 * XXX: we should avoid such a configuration in IPv6...
280 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
281 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) {
290 * Before deleting, check if a corresponding loopbacked host
291 * route surely exists. With this check, we can avoid to
292 * delete an interface direct route whose destination is same
293 * as the address being removed. This can happen when remofing
294 * a subnet-router anycast address on an interface attahced
295 * to a shared medium.
297 rt = rtpurelookup(ifa->ifa_addr);
298 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
299 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) {
301 in6_ifloop_request(RTM_DELETE, ifa);
307 in6_ifindex2scopeid(int idx)
310 struct sockaddr_in6 *sin6;
311 struct ifaddr_container *ifac;
313 if (idx < 0 || if_index < idx)
315 ifp = ifindex2ifnet[idx];
317 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
319 struct ifaddr *ifa = ifac->ifa;
321 if (ifa->ifa_addr->sa_family != AF_INET6)
323 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
324 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
325 return sin6->sin6_scope_id & 0xffff;
332 in6_mask2len(struct in6_addr *mask, u_char *lim0)
335 u_char *lim = lim0, *p;
338 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */
339 lim = (u_char *)mask + sizeof(*mask);
340 for (p = (u_char *)mask; p < lim; x++, p++) {
346 for (y = 0; y < 8; y++) {
347 if ((*p & (0x80 >> y)) == 0)
353 * when the limit pointer is given, do a stricter check on the
357 if (y != 0 && (*p & (0x00ff >> y)) != 0)
359 for (p = p + 1; p < lim; p++)
368 in6_len2mask(struct in6_addr *mask, int len)
372 bzero(mask, sizeof(*mask));
373 for (i = 0; i < len / 8; i++)
374 mask->s6_addr8[i] = 0xff;
376 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff;
379 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
380 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
383 in6_control_dispatch(netmsg_t msg)
387 error = in6_control(msg->control.base.nm_so,
389 msg->control.nm_data,
392 lwkt_replymsg(&msg->control.base.lmsg, error);
396 in6_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
399 struct netmsg_pru_control msg;
403 case SIOCSIFPREFIX_IN6:
404 case SIOCDIFPREFIX_IN6:
405 case SIOCAIFPREFIX_IN6:
406 case SIOCCIFPREFIX_IN6:
407 case SIOCSGIFPREFIX_IN6:
408 case SIOCGIFPREFIX_IN6:
409 log(LOG_NOTICE, "prefix ioctls are now invalidated. "
410 "please use ifconfig.\n");
413 case SIOCSIFADDR_IN6:
414 case SIOCSIFDSTADDR_IN6:
415 case SIOCSIFNETMASK_IN6:
417 * Since IPv6 allows a node to assign multiple addresses
418 * on a single interface, SIOCSIFxxx ioctls are not suitable
419 * and should be unused.
421 /* We decided to obsolete this command (20000704) */
429 * Do not pass those ioctl to driver handler since they are not
430 * properly setup. Instead just error out.
436 if ((error = priv_check(td, PRIV_ROOT)) != 0)
442 return in6_lifaddr_ioctl(so, cmd, data, ifp, td);
445 case SIOCGETSGCNT_IN6:
446 case SIOCGETMIFCNT_IN6:
448 case SIOCAADDRCTL_POLICY:
449 case SIOCDADDRCTL_POLICY:
451 case SIOCSNDFLUSH_IN6:
452 case SIOCSPFXFLUSH_IN6:
453 case SIOCSRTRFLUSH_IN6:
454 case SIOCSDEFIFACE_IN6:
455 case SIOCSIFINFO_FLAGS:
456 case OSIOCGIFINFO_IN6:
457 case SIOCGIFINFO_IN6:
460 case SIOCGNBRINFO_IN6:
461 case SIOCGDEFIFACE_IN6:
467 case SIOCSIFALIFETIME_IN6:
468 case SIOCAIFADDR_IN6:
469 case SIOCDIFADDR_IN6:
471 * Dispatch to netisr0 to run
473 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0,
474 in6_control_internal_dispatch);
479 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0);
480 return msg.base.lmsg.ms_error;
483 return in6_control_internal(cmd, data, ifp, td);
488 in6_control_internal_dispatch(netmsg_t msg)
492 error = in6_control_internal(msg->control.nm_cmd, msg->control.nm_data,
493 msg->control.nm_ifp, msg->control.nm_td);
494 lwkt_replymsg(&msg->lmsg, error);
498 in6_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
501 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
502 struct in6_ifaddr *ia = NULL;
503 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
504 struct in6_ifextra *xtra;
505 boolean_t privileged;
509 if (priv_check(td, PRIV_ROOT) == 0)
513 case SIOCGETSGCNT_IN6:
514 case SIOCGETMIFCNT_IN6:
515 return (mrt6_ioctl(cmd, data));
519 case SIOCAADDRCTL_POLICY:
520 case SIOCDADDRCTL_POLICY:
523 return (in6_src_ioctl(cmd, data));
530 case SIOCSNDFLUSH_IN6:
531 case SIOCSPFXFLUSH_IN6:
532 case SIOCSRTRFLUSH_IN6:
533 case SIOCSDEFIFACE_IN6:
534 case SIOCSIFINFO_FLAGS:
538 case OSIOCGIFINFO_IN6:
539 case SIOCGIFINFO_IN6:
542 case SIOCGNBRINFO_IN6:
543 case SIOCGDEFIFACE_IN6:
544 return (nd6_ioctl(cmd, data, ifp));
551 return (scope6_set(ifp,
552 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
555 return (scope6_get(ifp,
556 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id));
559 return (scope6_get_default((struct scope6_id *)
560 ifr->ifr_ifru.ifru_scope_id));
564 * Find address for this interface, if it exists.
566 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */
567 struct sockaddr_in6 *sa6 =
568 (struct sockaddr_in6 *)&ifra->ifra_addr;
570 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) {
571 if (sa6->sin6_addr.s6_addr16[1] == 0) {
572 /* Link ID is not embedded by the user */
573 sa6->sin6_addr.s6_addr16[1] =
574 htons(ifp->if_index);
575 } else if (sa6->sin6_addr.s6_addr16[1] !=
576 htons(ifp->if_index)) {
577 /* Link ID contradicts */
580 if (sa6->sin6_scope_id) {
581 if (sa6->sin6_scope_id !=
582 (u_int32_t)ifp->if_index)
584 sa6->sin6_scope_id = 0; /* XXX: good way? */
587 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
591 case SIOCDIFADDR_IN6:
593 * For IPv4, we look for existing in_ifaddr here to allow
594 * "ifconfig if0 delete" to remove first IPv4 address on the
595 * interface. For IPv6, as the spec allow multiple interface
596 * address from the day one, we consider "remove the first one"
597 * semantics to be not preferable.
600 return (EADDRNOTAVAIL);
602 case SIOCAIFADDR_IN6:
604 * We always require users to specify a valid IPv6 address for
605 * the corresponding operation.
607 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
608 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6))
609 return (EAFNOSUPPORT);
614 case SIOCGIFADDR_IN6:
615 /* This interface is basically deprecated. Use SIOCGIFCONF. */
617 case SIOCGIFAFLAG_IN6:
618 case SIOCGIFNETMASK_IN6:
619 case SIOCGIFDSTADDR_IN6:
620 case SIOCGIFALIFETIME_IN6:
621 /* Must think again about its semantics */
623 return (EADDRNOTAVAIL);
626 case SIOCSIFALIFETIME_IN6:
628 const struct in6_addrlifetime *lt;
633 return (EADDRNOTAVAIL);
634 /* Sanity for overflow - beware unsigned */
635 lt = &ifr->ifr_ifru.ifru_lifetime;
636 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME &&
637 lt->ia6t_vltime + time_uptime < time_uptime)
639 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME &&
640 lt->ia6t_pltime + time_uptime < time_uptime)
647 case SIOCGIFADDR_IN6:
648 ifr->ifr_addr = ia->ia_addr;
651 case SIOCGIFDSTADDR_IN6:
652 if (!(ifp->if_flags & IFF_POINTOPOINT))
655 * XXX: Should we check if ifa_dstaddr is NULL and return
658 ifr->ifr_dstaddr = ia->ia_dstaddr;
661 case SIOCGIFNETMASK_IN6:
662 ifr->ifr_addr = ia->ia_prefixmask;
665 case SIOCGIFAFLAG_IN6:
666 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
669 case SIOCGIFSTAT_IN6:
670 if ((xtra = ifp->if_afdata[AF_INET6]) == NULL)
672 bzero(&ifr->ifr_ifru.ifru_stat,
673 sizeof(ifr->ifr_ifru.ifru_stat));
674 ifr->ifr_ifru.ifru_stat = *xtra->in6_ifstat;
677 case SIOCGIFSTAT_ICMP6:
678 if ((xtra = ifp->if_afdata[AF_INET6]) == NULL)
680 bzero(&ifr->ifr_ifru.ifru_stat,
681 sizeof(ifr->ifr_ifru.ifru_icmp6stat));
682 ifr->ifr_ifru.ifru_icmp6stat = *xtra->icmp6_ifstat;
685 case SIOCGIFALIFETIME_IN6:
686 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
689 case SIOCSIFALIFETIME_IN6:
690 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime;
691 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
692 ia->ia6_lifetime.ia6t_expire =
693 time_uptime + ia->ia6_lifetime.ia6t_vltime;
695 ia->ia6_lifetime.ia6t_expire = 0;
697 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
698 ia->ia6_lifetime.ia6t_preferred =
699 time_uptime + ia->ia6_lifetime.ia6t_pltime;
701 ia->ia6_lifetime.ia6t_preferred = 0;
705 case SIOCAIFADDR_IN6:
707 int i, error = 0, iaIsNew;
708 struct nd_prefix pr0, *pr;
716 * First, make or update the interface address structure,
717 * and link it to the list.
719 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0)
723 * Then, make the prefix on-link on the interface.
724 * XXX: We'd rather create the prefix before the address, but
725 * we need at least one address to install the corresponding
726 * interface route, so we configure the address first.
730 * Convert mask to prefix length (prefixmask has already
731 * been validated in in6_update_ifa().
733 bzero(&pr0, sizeof(pr0));
735 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
737 if (pr0.ndpr_plen == 128)
738 break; /* no need to install a host route. */
739 pr0.ndpr_prefix = ifra->ifra_addr;
740 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr;
741 /* Apply the mask for safety. */
742 for (i = 0; i < 4; i++) {
743 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
744 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i];
747 * XXX: Since we don't have an API to set prefix (not address)
748 * lifetimes, we just use the same lifetimes as addresses.
749 * The (temporarily) installed lifetimes can be overridden by
750 * later advertised RAs (when accept_rtadv is non 0), which is
751 * an intended behavior.
753 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
755 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
756 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
757 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
759 /* Add the prefix if there's one. */
760 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
762 * nd6_prelist_add will install the corresponding
765 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0)
768 log(LOG_ERR, "nd6_prelist_add succeeded but "
770 return (EINVAL); /* XXX panic here? */
774 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr);
776 /* XXX: This should not happen! */
777 log(LOG_ERR, "in6_control: addition succeeded, but"
780 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
781 ia->ia6_ndpr == NULL) {
783 * New autoconf address
789 * If this is the first autoconf address from
790 * the prefix, create a temporary address
791 * as well (when specified).
793 if (ip6_use_tempaddr && pr->ndpr_refcnt == 1) {
796 if ((e = in6_tmpifadd(ia, 1)) != 0) {
797 log(LOG_NOTICE, "in6_control: "
798 "failed to create a "
799 "temporary address, "
806 * This might affect the status of autoconfigured
807 * addresses, that is, this address might make
808 * other addresses detached.
810 pfxlist_onlink_check();
812 if (error == 0 && ia) {
813 EVENTHANDLER_INVOKE(ifaddr_event, ifp,
814 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE,
820 case SIOCDIFADDR_IN6:
823 struct nd_prefix pr0, *pr;
826 * If the address being deleted is the only one that owns
827 * the corresponding prefix, expire the prefix as well.
828 * XXX: Theoretically, we don't have to warry about such
829 * relationship, since we separate the address management
830 * and the prefix management. We do this, however, to provide
831 * as much backward compatibility as possible in terms of
832 * the ioctl operation.
834 bzero(&pr0, sizeof(pr0));
836 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr,
838 if (pr0.ndpr_plen == 128)
840 pr0.ndpr_prefix = ia->ia_addr;
841 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr;
842 for (i = 0; i < 4; i++) {
843 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
844 ia->ia_prefixmask.sin6_addr.s6_addr32[i];
847 * The logic of the following condition is a bit complicated.
848 * We expire the prefix when
849 * 1. The address obeys autoconfiguration and it is the
850 * only owner of the associated prefix, or
851 * 2. The address does not obey autoconf and there is no
852 * other owner of the prefix.
854 if ((pr = nd6_prefix_lookup(&pr0)) != NULL &&
855 (((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
856 pr->ndpr_refcnt == 1) ||
857 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) &&
858 pr->ndpr_refcnt == 0)))
859 pr->ndpr_expire = 1; /* XXX: just for expiration */
862 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE,
864 in6_purgeaddr(&ia->ia_ifa);
869 if (ifp->if_ioctl == NULL)
871 ifnet_serialize_all(ifp);
872 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
873 ifnet_deserialize_all(ifp);
881 * Update parameters of an IPv6 interface address.
882 * If necessary, a new entry is created and linked into address chains.
883 * This function is separated from in6_control().
884 * XXX: should this be performed under splnet()?
887 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
888 struct in6_ifaddr *ia)
890 int error = 0, hostIsNew = 0, plen = -1;
891 struct in6_ifaddr *oia;
892 struct sockaddr_in6 dst6;
893 struct in6_addrlifetime *lt;
895 /* Validate parameters */
896 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
900 * The destination address for a p2p link must have a family
901 * of AF_UNSPEC or AF_INET6.
903 if ((ifp->if_flags & IFF_POINTOPOINT) &&
904 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
905 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
906 return (EAFNOSUPPORT);
908 * validate ifra_prefixmask. don't check sin6_family, netmask
909 * does not carry fields other than sin6_len.
911 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
914 * Because the IPv6 address architecture is classless, we require
915 * users to specify a (non 0) prefix length (mask) for a new address.
916 * We also require the prefix (when specified) mask is valid, and thus
917 * reject a non-consecutive mask.
919 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
921 if (ifra->ifra_prefixmask.sin6_len != 0) {
922 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
923 (u_char *)&ifra->ifra_prefixmask +
924 ifra->ifra_prefixmask.sin6_len);
930 * In this case, ia must not be NULL. We just use its prefix
933 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
936 * If the destination address on a p2p interface is specified,
937 * and the address is a scoped one, validate/set the scope
940 dst6 = ifra->ifra_dstaddr;
941 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) &&
942 (dst6.sin6_family == AF_INET6)) {
945 if ((error = in6_recoverscope(&dst6,
946 &ifra->ifra_dstaddr.sin6_addr,
949 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr);
950 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */
951 dst6.sin6_scope_id = scopeid;
952 else if (dst6.sin6_scope_id != scopeid)
953 return (EINVAL); /* scope ID mismatch. */
954 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL))
957 dst6.sin6_scope_id = 0; /* XXX */
960 * The destination address can be specified only for a p2p or a
961 * loopback interface. If specified, the corresponding prefix length
964 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
965 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
966 /* XXX: noisy message */
967 log(LOG_INFO, "in6_update_ifa: a destination can be "
968 "specified for a p2p or a loopback IF only\n");
973 * The following message seems noisy, but we dare to
974 * add it for diagnosis.
976 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 "
977 "when dstaddr is specified\n");
981 /* lifetime consistency check */
982 lt = &ifra->ifra_lifetime;
983 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME
984 && lt->ia6t_vltime + time_uptime < time_uptime) {
987 if (lt->ia6t_vltime == 0) {
989 * the following log might be noisy, but this is a typical
990 * configuration mistake or a tool's bug.
993 "in6_update_ifa: valid lifetime is 0 for %s\n",
994 ip6_sprintf(&ifra->ifra_addr.sin6_addr));
996 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME
997 && lt->ia6t_pltime + time_uptime < time_uptime) {
1002 * If this is a new address, allocate a new ifaddr and link it
1008 * When in6_update_ifa() is called in a process of a received
1009 * RA, it is called under splnet(). So, we should call malloc
1012 ia = ifa_create(sizeof(*ia), M_NOWAIT);
1015 /* Initialize the address and masks */
1016 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
1017 ia->ia_addr.sin6_family = AF_INET6;
1018 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
1019 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
1021 * XXX: some functions expect that ifa_dstaddr is not
1022 * NULL for p2p interfaces.
1024 ia->ia_ifa.ifa_dstaddr
1025 = (struct sockaddr *)&ia->ia_dstaddr;
1027 ia->ia_ifa.ifa_dstaddr = NULL;
1029 ia->ia_ifa.ifa_netmask
1030 = (struct sockaddr *)&ia->ia_prefixmask;
1033 if ((oia = in6_ifaddr) != NULL) {
1034 for ( ; oia->ia_next; oia = oia->ia_next)
1040 ifa_iflink(&ia->ia_ifa, ifp, 1);
1043 /* set prefix mask */
1044 if (ifra->ifra_prefixmask.sin6_len) {
1046 * We prohibit changing the prefix length of an existing
1048 * + such an operation should be rare in IPv6, and
1049 * + the operation would confuse prefix management.
1051 if (ia->ia_prefixmask.sin6_len &&
1052 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
1053 log(LOG_INFO, "in6_update_ifa: the prefix length of an"
1054 " existing (%s) address should not be changed\n",
1055 ip6_sprintf(&ia->ia_addr.sin6_addr));
1059 ia->ia_prefixmask = ifra->ifra_prefixmask;
1063 * If a new destination address is specified, scrub the old one and
1064 * install the new destination. Note that the interface must be
1065 * p2p or loopback (see the check above.)
1067 if (dst6.sin6_family == AF_INET6 &&
1068 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr,
1069 &ia->ia_dstaddr.sin6_addr)) {
1072 if ((ia->ia_flags & IFA_ROUTE) &&
1073 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1075 log(LOG_ERR, "in6_update_ifa: failed to remove "
1076 "a route to the old destination: %s\n",
1077 ip6_sprintf(&ia->ia_addr.sin6_addr));
1078 /* proceed anyway... */
1081 ia->ia_flags &= ~IFA_ROUTE;
1082 ia->ia_dstaddr = dst6;
1085 /* reset the interface and routing table appropriately. */
1086 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0)
1090 * Beyond this point, we should call in6_purgeaddr upon an error,
1091 * not just go to unlink.
1094 if (ifp->if_flags & IFF_MULTICAST) {
1095 struct sockaddr_in6 mltaddr, mltmask;
1096 struct in6_multi *in6m;
1100 * join solicited multicast addr for new host id
1102 struct in6_addr llsol;
1103 bzero(&llsol, sizeof(struct in6_addr));
1104 llsol.s6_addr16[0] = htons(0xff02);
1105 llsol.s6_addr16[1] = htons(ifp->if_index);
1106 llsol.s6_addr32[1] = 0;
1107 llsol.s6_addr32[2] = htonl(1);
1108 llsol.s6_addr32[3] =
1109 ifra->ifra_addr.sin6_addr.s6_addr32[3];
1110 llsol.s6_addr8[12] = 0xff;
1111 in6_addmulti(&llsol, ifp, &error);
1114 "in6_update_ifa: addmulti failed for "
1115 "%s on %s (errno=%d)\n",
1116 ip6_sprintf(&llsol), if_name(ifp),
1118 in6_purgeaddr((struct ifaddr *)ia);
1123 bzero(&mltmask, sizeof(mltmask));
1124 mltmask.sin6_len = sizeof(struct sockaddr_in6);
1125 mltmask.sin6_family = AF_INET6;
1126 mltmask.sin6_addr = in6mask32;
1129 * join link-local all-nodes address
1131 bzero(&mltaddr, sizeof(mltaddr));
1132 mltaddr.sin6_len = sizeof(struct sockaddr_in6);
1133 mltaddr.sin6_family = AF_INET6;
1134 mltaddr.sin6_addr = kin6addr_linklocal_allnodes;
1135 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
1137 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp);
1139 rtrequest_global(RTM_ADD,
1140 (struct sockaddr *)&mltaddr,
1141 (struct sockaddr *)&ia->ia_addr,
1142 (struct sockaddr *)&mltmask,
1143 RTF_UP|RTF_CLONING); /* xxx */
1144 in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
1147 "in6_update_ifa: addmulti failed for "
1148 "%s on %s (errno=%d)\n",
1149 ip6_sprintf(&mltaddr.sin6_addr),
1150 if_name(ifp), error);
1155 * join node information group address
1157 #define hostnamelen strlen(hostname)
1158 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr)
1160 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp);
1161 if (in6m == NULL && ia != NULL) {
1162 in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
1164 log(LOG_WARNING, "in6_update_ifa: "
1165 "addmulti failed for "
1166 "%s on %s (errno=%d)\n",
1167 ip6_sprintf(&mltaddr.sin6_addr),
1168 if_name(ifp), error);
1175 * join node-local all-nodes address, on loopback.
1176 * XXX: since "node-local" is obsoleted by interface-local,
1177 * we have to join the group on every interface with
1178 * some interface-boundary restriction.
1180 if (ifp->if_flags & IFF_LOOPBACK) {
1181 struct in6_ifaddr *ia_loop;
1183 struct in6_addr loop6 = kin6addr_loopback;
1184 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6);
1186 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes;
1188 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp);
1189 if (in6m == NULL && ia_loop != NULL) {
1190 rtrequest_global(RTM_ADD,
1191 (struct sockaddr *)&mltaddr,
1192 (struct sockaddr *)&ia_loop->ia_addr,
1193 (struct sockaddr *)&mltmask,
1195 in6_addmulti(&mltaddr.sin6_addr, ifp, &error);
1197 log(LOG_WARNING, "in6_update_ifa: "
1198 "addmulti failed for %s on %s "
1200 ip6_sprintf(&mltaddr.sin6_addr),
1201 if_name(ifp), error);
1207 ia->ia6_flags = ifra->ifra_flags;
1208 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/
1209 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */
1211 ia->ia6_lifetime = ifra->ifra_lifetime;
1213 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1214 ia->ia6_lifetime.ia6t_expire =
1215 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1217 ia->ia6_lifetime.ia6t_expire = 0;
1218 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1219 ia->ia6_lifetime.ia6t_preferred =
1220 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1222 ia->ia6_lifetime.ia6t_preferred = 0;
1225 * Perform DAD, if needed.
1226 * XXX It may be of use, if we can administratively
1229 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) {
1230 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1231 nd6_dad_start((struct ifaddr *)ia, NULL);
1238 * XXX: if a change of an existing address failed, keep the entry
1242 in6_unlink_ifa(ia, ifp);
1247 in6_purgeaddr(struct ifaddr *ifa)
1249 struct ifnet *ifp = ifa->ifa_ifp;
1250 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1252 /* stop DAD processing */
1256 * delete route to the destination of the address being purged.
1257 * The interface must be p2p or loopback in this case.
1259 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) {
1262 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST))
1264 log(LOG_ERR, "in6_purgeaddr: failed to remove "
1265 "a route to the p2p destination: %s on %s, "
1267 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp),
1269 /* proceed anyway... */
1272 ia->ia_flags &= ~IFA_ROUTE;
1275 /* Remove ownaddr's loopback rtentry, if it exists. */
1276 in6_ifremloop(&(ia->ia_ifa));
1278 if (ifp->if_flags & IFF_MULTICAST) {
1280 * delete solicited multicast addr for deleting host id
1282 struct in6_multi *in6m;
1283 struct in6_addr llsol;
1284 bzero(&llsol, sizeof(struct in6_addr));
1285 llsol.s6_addr16[0] = htons(0xff02);
1286 llsol.s6_addr16[1] = htons(ifp->if_index);
1287 llsol.s6_addr32[1] = 0;
1288 llsol.s6_addr32[2] = htonl(1);
1289 llsol.s6_addr32[3] =
1290 ia->ia_addr.sin6_addr.s6_addr32[3];
1291 llsol.s6_addr8[12] = 0xff;
1293 in6m = IN6_LOOKUP_MULTI(&llsol, ifp);
1298 in6_unlink_ifa(ia, ifp);
1302 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1304 struct in6_ifaddr *oia;
1308 ifa_ifunlink(&ia->ia_ifa, ifp);
1311 if (oia == (ia = in6_ifaddr))
1312 in6_ifaddr = ia->ia_next;
1314 while (ia->ia_next && (ia->ia_next != oia))
1317 ia->ia_next = oia->ia_next;
1320 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n");
1325 * When an autoconfigured address is being removed, release the
1326 * reference to the base prefix. Also, since the release might
1327 * affect the status of other (detached) addresses, call
1328 * pfxlist_onlink_check().
1330 if (oia->ia6_flags & IN6_IFF_AUTOCONF) {
1331 if (oia->ia6_ndpr == NULL) {
1332 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address "
1333 "%p has no prefix\n", oia);
1335 oia->ia6_ndpr->ndpr_refcnt--;
1336 oia->ia6_flags &= ~IN6_IFF_AUTOCONF;
1337 oia->ia6_ndpr = NULL;
1340 pfxlist_onlink_check();
1344 * release another refcnt for the link from in6_ifaddr.
1345 * Note that we should decrement the refcnt at least once for all *BSD.
1347 ifa_destroy(&oia->ia_ifa);
1353 in6_purgeif(struct ifnet *ifp)
1355 struct ifaddr_container *ifac, *next;
1357 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid],
1359 if (ifac->ifa->ifa_addr->sa_family != AF_INET6)
1361 in6_purgeaddr(ifac->ifa);
1369 * SIOCGLIFADDR: get first address. (?)
1370 * SIOCGLIFADDR with IFLR_PREFIX:
1371 * get first address that matches the specified prefix.
1372 * SIOCALIFADDR: add the specified address.
1373 * SIOCALIFADDR with IFLR_PREFIX:
1374 * add the specified prefix, filling hostid part from
1375 * the first link-local address. prefixlen must be <= 64.
1376 * SIOCDLIFADDR: delete the specified address.
1377 * SIOCDLIFADDR with IFLR_PREFIX:
1378 * delete the first address that matches the specified prefix.
1380 * EINVAL on invalid parameters
1381 * EADDRNOTAVAIL on prefix match failed/specified address not found
1382 * other values may be returned from in6_ioctl()
1384 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64.
1385 * this is to accomodate address naming scheme other than RFC2374,
1387 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374
1388 * address encoding scheme. (see figure on page 8)
1391 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
1392 struct ifnet *ifp, struct thread *td)
1394 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
1395 struct sockaddr *sa;
1398 if (!data || !ifp) {
1399 panic("invalid argument to in6_lifaddr_ioctl");
1405 /* address must be specified on GET with IFLR_PREFIX */
1406 if (!(iflr->flags & IFLR_PREFIX))
1411 /* address must be specified on ADD and DELETE */
1412 sa = (struct sockaddr *)&iflr->addr;
1413 if (sa->sa_family != AF_INET6)
1415 if (sa->sa_len != sizeof(struct sockaddr_in6))
1417 /* XXX need improvement */
1418 sa = (struct sockaddr *)&iflr->dstaddr;
1419 if (sa->sa_family && sa->sa_family != AF_INET6)
1421 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6))
1424 default: /* shouldn't happen */
1426 panic("invalid cmd to in6_lifaddr_ioctl");
1432 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen)
1438 struct in6_aliasreq ifra;
1439 struct in6_addr *hostid = NULL;
1442 if (iflr->flags & IFLR_PREFIX) {
1444 struct sockaddr_in6 *sin6;
1447 * hostid is to fill in the hostid part of the
1448 * address. hostid points to the first link-local
1449 * address attached to the interface.
1451 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);
1453 return EADDRNOTAVAIL;
1454 hostid = IFA_IN6(ifa);
1456 /* prefixlen must be <= 64. */
1457 if (64 < iflr->prefixlen)
1459 prefixlen = iflr->prefixlen;
1461 /* hostid part must be zero. */
1462 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1463 if (sin6->sin6_addr.s6_addr32[2] != 0
1464 || sin6->sin6_addr.s6_addr32[3] != 0) {
1468 prefixlen = iflr->prefixlen;
1470 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
1471 bzero(&ifra, sizeof(ifra));
1472 bcopy(iflr->iflr_name, ifra.ifra_name,
1473 sizeof(ifra.ifra_name));
1475 bcopy(&iflr->addr, &ifra.ifra_addr,
1476 ((struct sockaddr *)&iflr->addr)->sa_len);
1478 /* fill in hostid part */
1479 ifra.ifra_addr.sin6_addr.s6_addr32[2] =
1480 hostid->s6_addr32[2];
1481 ifra.ifra_addr.sin6_addr.s6_addr32[3] =
1482 hostid->s6_addr32[3];
1485 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/
1486 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
1487 ((struct sockaddr *)&iflr->dstaddr)->sa_len);
1489 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] =
1490 hostid->s6_addr32[2];
1491 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] =
1492 hostid->s6_addr32[3];
1496 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1497 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen);
1499 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX;
1500 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td);
1505 struct ifaddr_container *ifac;
1506 struct in6_ifaddr *ia;
1507 struct in6_addr mask, candidate, match;
1508 struct sockaddr_in6 *sin6;
1511 bzero(&mask, sizeof(mask));
1512 if (iflr->flags & IFLR_PREFIX) {
1513 /* lookup a prefix rather than address. */
1514 in6_len2mask(&mask, iflr->prefixlen);
1516 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1517 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1518 match.s6_addr32[0] &= mask.s6_addr32[0];
1519 match.s6_addr32[1] &= mask.s6_addr32[1];
1520 match.s6_addr32[2] &= mask.s6_addr32[2];
1521 match.s6_addr32[3] &= mask.s6_addr32[3];
1523 /* if you set extra bits, that's wrong */
1524 if (bcmp(&match, &sin6->sin6_addr, sizeof(match)))
1529 if (cmd == SIOCGLIFADDR) {
1530 /* on getting an address, take the 1st match */
1533 /* on deleting an address, do exact match */
1534 in6_len2mask(&mask, 128);
1535 sin6 = (struct sockaddr_in6 *)&iflr->addr;
1536 bcopy(&sin6->sin6_addr, &match, sizeof(match));
1542 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1543 struct ifaddr *ifa = ifac->ifa;
1545 if (ifa->ifa_addr->sa_family != AF_INET6)
1550 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate));
1552 * XXX: this is adhoc, but is necessary to allow
1553 * a user to specify fe80::/64 (not /10) for a
1554 * link-local address.
1556 if (IN6_IS_ADDR_LINKLOCAL(&candidate))
1557 candidate.s6_addr16[1] = 0;
1558 candidate.s6_addr32[0] &= mask.s6_addr32[0];
1559 candidate.s6_addr32[1] &= mask.s6_addr32[1];
1560 candidate.s6_addr32[2] &= mask.s6_addr32[2];
1561 candidate.s6_addr32[3] &= mask.s6_addr32[3];
1562 if (IN6_ARE_ADDR_EQUAL(&candidate, &match))
1566 return EADDRNOTAVAIL;
1567 ia = ifa2ia6(ifac->ifa);
1569 if (cmd == SIOCGLIFADDR) {
1570 struct sockaddr_in6 *s6;
1572 /* fill in the if_laddrreq structure */
1573 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len);
1574 s6 = (struct sockaddr_in6 *)&iflr->addr;
1575 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1576 s6->sin6_addr.s6_addr16[1] = 0;
1578 in6_addr2scopeid(ifp, &s6->sin6_addr);
1580 if (ifp->if_flags & IFF_POINTOPOINT) {
1581 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
1582 ia->ia_dstaddr.sin6_len);
1583 s6 = (struct sockaddr_in6 *)&iflr->dstaddr;
1584 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) {
1585 s6->sin6_addr.s6_addr16[1] = 0;
1587 in6_addr2scopeid(ifp,
1591 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
1594 in6_mask2len(&ia->ia_prefixmask.sin6_addr,
1597 iflr->flags = ia->ia6_flags; /* XXX */
1601 struct in6_aliasreq ifra;
1603 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
1604 bzero(&ifra, sizeof(ifra));
1605 bcopy(iflr->iflr_name, ifra.ifra_name,
1606 sizeof(ifra.ifra_name));
1608 bcopy(&ia->ia_addr, &ifra.ifra_addr,
1609 ia->ia_addr.sin6_len);
1610 if (ifp->if_flags & IFF_POINTOPOINT)
1611 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
1612 ia->ia_dstaddr.sin6_len);
1614 bzero(&ifra.ifra_dstaddr,
1615 sizeof(ifra.ifra_dstaddr));
1616 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr,
1617 ia->ia_prefixmask.sin6_len);
1619 ifra.ifra_flags = ia->ia6_flags;
1620 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra,
1626 return EOPNOTSUPP; /* just for safety */
1630 * Initialize an interface's intetnet6 address
1631 * and routing table entry.
1634 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6,
1637 int error = 0, plen, ifacount = 0;
1638 struct ifaddr_container *ifac;
1641 * Give the interface a chance to initialize
1642 * if this is its first address,
1643 * and to validate the address if necessary.
1645 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1646 if (ifac->ifa->ifa_addr == NULL)
1647 continue; /* just for safety */
1648 if (ifac->ifa->ifa_addr->sa_family != AF_INET6)
1653 ifnet_serialize_all(ifp);
1655 ia->ia_addr = *sin6;
1657 if (ifacount <= 1 && ifp->if_ioctl &&
1658 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) {
1659 ifnet_deserialize_all(ifp);
1663 ifnet_deserialize_all(ifp);
1665 ia->ia_ifa.ifa_metric = ifp->if_metric;
1667 /* we could do in(6)_socktrim here, but just omit it at this moment. */
1671 * If the destination address is specified for a point-to-point
1672 * interface, install a route to the destination as an interface
1675 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1676 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) {
1677 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD,
1678 RTF_UP | RTF_HOST)) != 0)
1680 ia->ia_flags |= IFA_ROUTE;
1684 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto().
1686 ia->ia_ifa.ifa_flags |= RTF_CLONING;
1689 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */
1691 /* set the rtrequest function to create llinfo */
1692 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
1693 in6_ifaddloop(&(ia->ia_ifa));
1699 struct in6_multi_mship *
1700 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp)
1702 struct in6_multi_mship *imm;
1704 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT);
1709 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp);
1710 if (!imm->i6mm_maddr) {
1711 /* *errorp is alrady set */
1712 kfree(imm, M_IPMADDR);
1719 in6_leavegroup(struct in6_multi_mship *imm)
1722 if (imm->i6mm_maddr)
1723 in6_delmulti(imm->i6mm_maddr);
1724 kfree(imm, M_IPMADDR);
1729 * Add an address to the list of IP6 multicast addresses for a
1733 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp)
1735 struct in6_multi *in6m;
1736 struct sockaddr_in6 sin6;
1737 struct ifmultiaddr *ifma;
1744 * Call generic routine to add membership or increment
1745 * refcount. It wants addresses in the form of a sockaddr,
1746 * so we build one here (being careful to zero the unused bytes).
1748 bzero(&sin6, sizeof sin6);
1749 sin6.sin6_family = AF_INET6;
1750 sin6.sin6_len = sizeof sin6;
1751 sin6.sin6_addr = *maddr6;
1752 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma);
1759 * If ifma->ifma_protospec is null, then if_addmulti() created
1760 * a new record. Otherwise, we are done.
1762 if (ifma->ifma_protospec != NULL) {
1764 return ifma->ifma_protospec;
1767 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
1768 at interrupt time? If so, need to fix if_addmulti. XXX */
1769 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT);
1775 bzero(in6m, sizeof *in6m);
1776 in6m->in6m_addr = *maddr6;
1777 in6m->in6m_ifp = ifp;
1778 in6m->in6m_ifma = ifma;
1779 ifma->ifma_protospec = in6m;
1780 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry);
1783 * Let MLD6 know that we have joined a new IP6 multicast
1786 mld6_start_listening(in6m);
1792 * Delete a multicast address record.
1795 in6_delmulti(struct in6_multi *in6m)
1797 struct ifmultiaddr *ifma = in6m->in6m_ifma;
1801 if (ifma->ifma_refcount == 1) {
1803 * No remaining claims to this record; let MLD6 know
1804 * that we are leaving the multicast group.
1806 mld6_stop_listening(in6m);
1807 ifma->ifma_protospec = NULL;
1808 LIST_REMOVE(in6m, in6m_entry);
1809 kfree(in6m, M_IPMADDR);
1811 /* XXX - should be separate API for when we have an ifma? */
1812 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1817 * Find an IPv6 interface link-local address specific to an interface.
1820 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1822 struct ifaddr_container *ifac;
1824 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1825 struct ifaddr *ifa = ifac->ifa;
1827 if (ifa->ifa_addr == NULL)
1828 continue; /* just for safety */
1829 if (ifa->ifa_addr->sa_family != AF_INET6)
1831 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1832 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1839 return ((struct in6_ifaddr *)(ifac->ifa));
1846 * find the internet address corresponding to a given interface and address.
1849 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr)
1851 const struct ifaddr_container *ifac;
1853 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1854 struct ifaddr *ifa = ifac->ifa;
1856 if (ifa->ifa_addr == NULL)
1857 continue; /* just for safety */
1858 if (ifa->ifa_addr->sa_family != AF_INET6)
1860 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa)))
1861 return (struct in6_ifaddr *)ifa;
1867 * Find a link-local scoped address on ifp and return it if any.
1870 in6ifa_llaonifp(struct ifnet *ifp)
1872 struct sockaddr_in6 *sin6;
1873 struct ifaddr_container *ifac;
1875 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1876 struct ifaddr *ifa = ifac->ifa;
1878 if (ifa->ifa_addr->sa_family != AF_INET6)
1880 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1881 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1882 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1883 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1887 return ((struct in6_ifaddr *)(ifac->ifa));
1893 * find the internet address on a given interface corresponding to a neighbor's
1897 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr)
1900 struct in6_ifaddr *ia;
1901 struct ifaddr_container *ifac;
1903 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1906 if (ifa->ifa_addr == NULL)
1907 continue; /* just for safety */
1908 if (ifa->ifa_addr->sa_family != AF_INET6)
1910 ia = (struct in6_ifaddr *)ifa;
1911 if (IN6_ARE_MASKED_ADDR_EQUAL(addr,
1912 &ia->ia_addr.sin6_addr,
1913 &ia->ia_prefixmask.sin6_addr))
1921 * Convert IP6 address to printable (loggable) representation.
1923 static char digits[] = "0123456789abcdef";
1924 static int ip6round = 0;
1926 ip6_sprintf(const struct in6_addr *addr)
1928 static char ip6buf[8][48];
1931 const u_short *a = (const u_short *)addr;
1935 ip6round = (ip6round + 1) & 7;
1936 cp = ip6buf[ip6round];
1938 for (i = 0; i < 8; i++) {
1949 if (dcolon == 0 && *(a + 1) == 0) {
1961 d = (const u_char *)a;
1962 *cp++ = digits[*d >> 4];
1963 *cp++ = digits[*d++ & 0xf];
1964 *cp++ = digits[*d >> 4];
1965 *cp++ = digits[*d & 0xf];
1970 return (ip6buf[ip6round]);
1974 in6_localaddr(struct in6_addr *in6)
1976 struct in6_ifaddr *ia;
1978 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1981 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
1982 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1983 &ia->ia_prefixmask.sin6_addr))
1990 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1992 struct in6_ifaddr *ia;
1994 for (ia = in6_ifaddr; ia; ia = ia->ia_next) {
1995 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1997 (ia->ia6_flags & IN6_IFF_DEPRECATED))
1998 return (1); /* true */
2000 /* XXX: do we still have to go thru the rest of the list? */
2003 return (0); /* false */
2007 * return length of part which dst and src are equal
2011 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
2014 u_char *s = (u_char *)src, *d = (u_char *)dst;
2015 u_char *lim = s + 16, r;
2018 if ((r = (*d++ ^ *s++)) != 0) {
2029 /* XXX: to be scope conscious */
2031 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
2033 int bytelen, bitlen;
2036 if (0 > len || len > 128) {
2037 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
2045 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
2047 if (p1->s6_addr[bytelen] >> (8 - bitlen) !=
2048 p2->s6_addr[bytelen] >> (8 - bitlen))
2055 in6_prefixlen2mask(struct in6_addr *maskp, int len)
2057 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
2058 int bytelen, bitlen, i;
2061 if (0 > len || len > 128) {
2062 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
2067 bzero(maskp, sizeof(*maskp));
2070 for (i = 0; i < bytelen; i++)
2071 maskp->s6_addr[i] = 0xff;
2073 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
2077 * return the best address out of the same scope
2080 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst, struct ucred *cred)
2082 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0;
2085 struct in6_ifaddr *ifa_best = NULL;
2088 if(cred && cred->cr_prison)
2093 kprintf("in6_ifawithscope: output interface is not specified\n");
2099 * We search for all addresses on all interfaces from the beginning.
2100 * Comparing an interface with the outgoing interface will be done
2101 * only at the final stage of tiebreaking.
2103 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2105 struct ifaddr_container *ifac;
2108 * We can never take an address that breaks the scope zone
2109 * of the destination.
2111 if (ifp->if_afdata[AF_INET6] == NULL)
2113 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst))
2116 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2117 int tlen = -1, dscopecmp, bscopecmp, matchcmp;
2118 struct ifaddr *ifa = ifac->ifa;
2120 if (ifa->ifa_addr->sa_family != AF_INET6)
2123 src_scope = in6_addrscope(IFA_IN6(ifa));
2126 * Don't use an address before completing DAD
2127 * nor a duplicated address.
2129 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2133 /* XXX: is there any case to allow anycasts? */
2134 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2138 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2142 /* Skip adresses not valid for current jail */
2144 !jailed_ip(cred->cr_prison, (struct sockaddr *)(ifa->ifa_addr)) != 0)
2148 * If this is the first address we find,
2151 if (ifa_best == NULL)
2155 * ifa_best is never NULL beyond this line except
2156 * within the block labeled "replace".
2160 * If ifa_best has a smaller scope than dst and
2161 * the current address has a larger one than
2162 * (or equal to) dst, always replace ifa_best.
2163 * Also, if the current address has a smaller scope
2164 * than dst, ignore it unless ifa_best also has a
2166 * Consequently, after the two if-clause below,
2167 * the followings must be satisfied:
2168 * (scope(src) < scope(dst) &&
2169 * scope(best) < scope(dst))
2171 * (scope(best) >= scope(dst) &&
2172 * scope(src) >= scope(dst))
2174 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 &&
2175 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0)
2176 goto replace; /* (A) */
2177 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 &&
2178 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0)
2182 * A deprecated address SHOULD NOT be used in new
2183 * communications if an alternate (non-deprecated)
2184 * address is available and has sufficient scope.
2185 * RFC 2462, Section 5.5.4.
2187 if (((struct in6_ifaddr *)ifa)->ia6_flags &
2188 IN6_IFF_DEPRECATED) {
2190 * Ignore any deprecated addresses if
2191 * specified by configuration.
2193 if (!ip6_use_deprecated)
2197 * If we have already found a non-deprecated
2198 * candidate, just ignore deprecated addresses.
2200 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED))
2205 * A non-deprecated address is always preferred
2206 * to a deprecated one regardless of scopes and
2207 * address matching (Note invariants ensured by the
2208 * conditions (A) and (B) above.)
2210 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) &&
2211 !(((struct in6_ifaddr *)ifa)->ia6_flags &
2212 IN6_IFF_DEPRECATED))
2216 * When we use temporary addresses described in
2217 * RFC 3041, we prefer temporary addresses to
2218 * public autoconf addresses. Again, note the
2219 * invariants from (A) and (B). Also note that we
2220 * don't have any preference between static addresses
2221 * and autoconf addresses (despite of whether or not
2222 * the latter is temporary or public.)
2224 if (ip6_use_tempaddr) {
2225 struct in6_ifaddr *ifat;
2227 ifat = (struct in6_ifaddr *)ifa;
2228 if ((ifa_best->ia6_flags &
2229 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2230 == IN6_IFF_AUTOCONF &&
2232 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2233 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) {
2236 if ((ifa_best->ia6_flags &
2237 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2238 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) &&
2240 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY))
2241 == IN6_IFF_AUTOCONF) {
2247 * At this point, we have two cases:
2248 * 1. we are looking at a non-deprecated address,
2249 * and ifa_best is also non-deprecated.
2250 * 2. we are looking at a deprecated address,
2251 * and ifa_best is also deprecated.
2252 * Also, we do not have to consider a case where
2253 * the scope of if_best is larger(smaller) than dst and
2254 * the scope of the current address is smaller(larger)
2255 * than dst. Such a case has already been covered.
2256 * Tiebreaking is done according to the following
2258 * - the scope comparison between the address and
2260 * - the scope comparison between the address and
2261 * ifa_best (bscopecmp)
2262 * - if the address match dst longer than ifa_best
2264 * - if the address is on the outgoing I/F (outI/F)
2266 * Roughly speaking, the selection policy is
2267 * - the most important item is scope. The same scope
2268 * is best. Then search for a larger scope.
2269 * Smaller scopes are the last resort.
2270 * - A deprecated address is chosen only when we have
2271 * no address that has an enough scope, but is
2272 * prefered to any addresses of smaller scopes
2273 * (this must be already done above.)
2274 * - addresses on the outgoing I/F are preferred to
2275 * ones on other interfaces if none of above
2276 * tiebreaks. In the table below, the column "bI"
2277 * means if the best_ifa is on the outgoing
2278 * interface, and the column "sI" means if the ifa
2279 * is on the outgoing interface.
2280 * - If there is no other reasons to choose one,
2281 * longest address match against dst is considered.
2283 * The precise decision table is as follows:
2284 * dscopecmp bscopecmp match bI oI | replace?
2285 * N/A equal N/A Y N | No (1)
2286 * N/A equal N/A N Y | Yes (2)
2287 * N/A equal larger N/A | Yes (3)
2288 * N/A equal !larger N/A | No (4)
2289 * larger larger N/A N/A | No (5)
2290 * larger smaller N/A N/A | Yes (6)
2291 * smaller larger N/A N/A | Yes (7)
2292 * smaller smaller N/A N/A | No (8)
2293 * equal smaller N/A N/A | Yes (9)
2294 * equal larger (already done at A above)
2296 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope);
2297 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope);
2299 if (bscopecmp == 0) {
2300 struct ifnet *bifp = ifa_best->ia_ifp;
2302 if (bifp == oifp && ifp != oifp) /* (1) */
2304 if (bifp != oifp && ifp == oifp) /* (2) */
2308 * Both bifp and ifp are on the outgoing
2309 * interface, or both two are on a different
2310 * interface from the outgoing I/F.
2311 * now we need address matching against dst
2314 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2315 matchcmp = tlen - blen;
2316 if (matchcmp > 0) /* (3) */
2320 if (dscopecmp > 0) {
2321 if (bscopecmp > 0) /* (5) */
2323 goto replace; /* (6) */
2325 if (dscopecmp < 0) {
2326 if (bscopecmp > 0) /* (7) */
2331 /* now dscopecmp must be 0 */
2333 goto replace; /* (9) */
2336 ifa_best = (struct in6_ifaddr *)ifa;
2337 blen = tlen >= 0 ? tlen :
2338 in6_matchlen(IFA_IN6(ifa), dst);
2339 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr);
2343 /* count statistics for future improvements */
2344 if (ifa_best == NULL)
2345 ip6stat.ip6s_sources_none++;
2347 if (oifp == ifa_best->ia_ifp)
2348 ip6stat.ip6s_sources_sameif[best_scope]++;
2350 ip6stat.ip6s_sources_otherif[best_scope]++;
2352 if (best_scope == dst_scope)
2353 ip6stat.ip6s_sources_samescope[best_scope]++;
2355 ip6stat.ip6s_sources_otherscope[best_scope]++;
2357 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED)
2358 ip6stat.ip6s_sources_deprecated[best_scope]++;
2365 * return the best address out of the same scope. if no address was
2366 * found, return the first valid address from designated IF.
2369 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
2371 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
2372 struct ifaddr_container *ifac;
2373 struct in6_ifaddr *besta = NULL;
2374 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
2376 dep[0] = dep[1] = NULL;
2379 * We first look for addresses in the same scope.
2380 * If there is one, return it.
2381 * If two or more, return one which matches the dst longest.
2382 * If none, return one of global addresses assigned other ifs.
2384 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2385 struct ifaddr *ifa = ifac->ifa;
2387 if (ifa->ifa_addr->sa_family != AF_INET6)
2389 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2390 continue; /* XXX: is there any case to allow anycast? */
2391 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2392 continue; /* don't use this interface */
2393 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2395 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2396 if (ip6_use_deprecated)
2397 dep[0] = (struct in6_ifaddr *)ifa;
2401 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2403 * call in6_matchlen() as few as possible
2407 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2408 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2411 besta = (struct in6_ifaddr *)ifa;
2414 besta = (struct in6_ifaddr *)ifa;
2420 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2421 struct ifaddr *ifa = ifac->ifa;
2423 if (ifa->ifa_addr->sa_family != AF_INET6)
2425 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2426 continue; /* XXX: is there any case to allow anycast? */
2427 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2428 continue; /* don't use this interface */
2429 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2431 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2432 if (ip6_use_deprecated)
2433 dep[1] = (struct in6_ifaddr *)ifa;
2437 return (struct in6_ifaddr *)ifa;
2440 /* use the last-resort values, that are, deprecated addresses */
2450 * perform DAD when interface becomes IFF_UP.
2453 in6_if_up(struct ifnet *ifp)
2455 struct ifaddr_container *ifac;
2456 struct in6_ifaddr *ia;
2457 int dad_delay; /* delay ticks before DAD output */
2460 * special cases, like 6to4, are handled in in6_ifattach
2462 in6_ifattach(ifp, NULL);
2465 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2466 struct ifaddr *ifa = ifac->ifa;
2468 if (ifa->ifa_addr->sa_family != AF_INET6)
2470 ia = (struct in6_ifaddr *)ifa;
2471 if (ia->ia6_flags & IN6_IFF_TENTATIVE)
2472 nd6_dad_start(ifa, &dad_delay);
2477 in6if_do_dad(struct ifnet *ifp)
2479 if (ifp->if_flags & IFF_LOOPBACK)
2482 switch (ifp->if_type) {
2488 * These interfaces do not have the IFF_LOOPBACK flag,
2489 * but loop packets back. We do not have to do DAD on such
2490 * interfaces. We should even omit it, because loop-backed
2491 * NS would confuse the DAD procedure.
2496 * Our DAD routine requires the interface up and running.
2497 * However, some interfaces can be up before the RUNNING
2498 * status. Additionaly, users may try to assign addresses
2499 * before the interface becomes up (or running).
2500 * We simply skip DAD in such a case as a work around.
2501 * XXX: we should rather mark "tentative" on such addresses,
2502 * and do DAD after the interface becomes ready.
2504 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) !=
2505 (IFF_UP|IFF_RUNNING))
2513 * Calculate max IPv6 MTU through all the interfaces and store it
2519 unsigned long maxmtu = 0;
2522 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
2524 /* this function can be called during ifnet initialization */
2525 if (ifp->if_afdata[AF_INET6] == NULL)
2527 if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
2528 ND_IFINFO(ifp)->linkmtu > maxmtu)
2529 maxmtu = ND_IFINFO(ifp)->linkmtu;
2531 if (maxmtu) /* update only when maxmtu is positive */
2532 in6_maxmtu = maxmtu;
2536 in6_domifattach(struct ifnet *ifp)
2538 struct in6_ifextra *ext;
2540 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2541 bzero(ext, sizeof(*ext));
2543 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat),
2544 M_IFADDR, M_WAITOK);
2545 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat));
2548 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat),
2549 M_IFADDR, M_WAITOK);
2550 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat));
2552 ext->nd_ifinfo = nd6_ifattach(ifp);
2553 ext->scope6_id = scope6_ifattach(ifp);
2558 in6_domifdetach(struct ifnet *ifp, void *aux)
2560 struct in6_ifextra *ext = (struct in6_ifextra *)aux;
2561 scope6_ifdetach(ext->scope6_id);
2562 nd6_ifdetach(ext->nd_ifinfo);
2563 kfree(ext->in6_ifstat, M_IFADDR);
2564 kfree(ext->icmp6_ifstat, M_IFADDR);
2565 kfree(ext, M_IFADDR);