1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei 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.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
43 #include <sys/kernel.h>
44 #include <sys/errno.h>
45 #include <sys/syslog.h>
46 #include <sys/queue.h>
47 #include <sys/globaldata.h>
48 #include <sys/mutex.h>
50 #include <sys/thread2.h>
51 #include <sys/mutex2.h>
54 #include <net/if_types.h>
55 #include <net/if_dl.h>
56 #include <net/route.h>
57 #include <net/radix.h>
59 #include <netinet/in.h>
60 #include <netinet6/in6_var.h>
61 #include <netinet6/in6_ifattach.h>
62 #include <netinet/ip6.h>
63 #include <netinet6/ip6_var.h>
64 #include <netinet6/nd6.h>
65 #include <netinet/icmp6.h>
66 #include <netinet6/scope6_var.h>
68 #include <net/net_osdep.h>
70 #define SDL(s) ((struct sockaddr_dl *)s)
72 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
73 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
75 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
76 struct nd_defrouter *);
77 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
78 static void pfxrtr_del (struct nd_pfxrouter *);
79 static struct nd_pfxrouter *find_pfxlist_reachable_router
81 static void defrouter_addifreq (struct ifnet *);
83 static void in6_init_address_ltimes (struct nd_prefix *ndpr,
84 struct in6_addrlifetime *lt6);
86 static int rt6_deleteroute (struct radix_node *, void *);
88 extern int nd6_recalc_reachtm_interval;
90 static struct ifnet *nd6_defifp;
93 int ip6_use_tempaddr = 0;
95 int ip6_desync_factor;
96 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
97 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
99 * shorter lifetimes for debugging purposes.
100 int ip6_temp_preferred_lifetime = 800;
101 static int ip6_temp_valid_lifetime = 1800;
103 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
106 * Receive Router Solicitation Message - just for routers.
107 * Router solicitation/advertisement is mostly managed by userland program
108 * (rtadvd) so here we have no function like nd6_ra_output().
113 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
115 struct ifnet *ifp = m->m_pkthdr.rcvif;
116 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
117 struct nd_router_solicit *nd_rs;
118 struct in6_addr saddr6 = ip6->ip6_src;
120 struct in6_addr daddr6 = ip6->ip6_dst;
125 struct sockaddr_dl *sdl = NULL;
126 struct llinfo_nd6 *ln = NULL;
127 struct rtentry *rt = NULL;
130 union nd_opts ndopts;
132 /* If I'm not a router, ignore it. */
133 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
137 if (ip6->ip6_hlim != 255) {
139 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
140 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
141 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
146 * Don't update the neighbor cache, if src = ::.
147 * This indicates that the src has no IP address assigned yet.
149 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
152 #ifndef PULLDOWN_TEST
153 IP6_EXTHDR_CHECK(m, off, icmp6len,);
154 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
156 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
158 icmp6stat.icp6s_tooshort++;
163 icmp6len -= sizeof(*nd_rs);
164 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
165 if (nd6_options(&ndopts) < 0) {
167 "nd6_rs_input: invalid ND option, ignored\n"));
168 /* nd6_options have incremented stats */
172 if (ndopts.nd_opts_src_lladdr) {
173 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
174 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
177 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
179 "nd6_rs_input: lladdrlen mismatch for %s "
180 "(if %d, RS packet %d)\n",
181 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
185 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
192 icmp6stat.icp6s_badrs++;
197 * Receive Router Advertisement Message.
200 * TODO: on-link bit on prefix information
201 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
204 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
206 struct ifnet *ifp = m->m_pkthdr.rcvif;
207 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
209 struct nd_router_advert *nd_ra;
210 struct in6_addr saddr6 = ip6->ip6_src;
212 struct in6_addr daddr6 = ip6->ip6_dst;
213 int flags; /* = nd_ra->nd_ra_flags_reserved; */
214 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
215 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
217 union nd_opts ndopts;
218 struct nd_defrouter *dr;
221 * We only accept RAs only when
222 * the system-wide variable allows the acceptance, and
223 * per-interface variable allows RAs on the receiving interface.
225 if (ip6_accept_rtadv == 0)
227 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
230 if (ip6->ip6_hlim != 255) {
232 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
233 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
234 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
238 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
240 "nd6_ra_input: src %s is not link-local\n",
241 ip6_sprintf(&saddr6)));
245 #ifndef PULLDOWN_TEST
246 IP6_EXTHDR_CHECK(m, off, icmp6len,);
247 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
249 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
251 icmp6stat.icp6s_tooshort++;
256 icmp6len -= sizeof(*nd_ra);
257 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
258 if (nd6_options(&ndopts) < 0) {
260 "nd6_ra_input: invalid ND option, ignored\n"));
261 /* nd6_options have incremented stats */
266 struct nd_defrouter dr0;
267 u_int32_t advreachable = nd_ra->nd_ra_reachable;
270 dr0.flags = nd_ra->nd_ra_flags_reserved;
271 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
272 dr0.expire = time_uptime + dr0.rtlifetime;
274 dr0.advint = 0; /* Mobile IPv6 */
275 dr0.advint_expire = 0; /* Mobile IPv6 */
276 dr0.advints_lost = 0; /* Mobile IPv6 */
277 /* unspecified or not? (RFC 2461 6.3.4) */
279 advreachable = ntohl(advreachable);
280 if (advreachable <= MAX_REACHABLE_TIME &&
281 ndi->basereachable != advreachable) {
282 ndi->basereachable = advreachable;
283 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
284 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
287 if (nd_ra->nd_ra_retransmit)
288 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
289 if (nd_ra->nd_ra_curhoplimit)
290 ndi->chlim = nd_ra->nd_ra_curhoplimit;
291 dr = defrtrlist_update(&dr0);
297 if (ndopts.nd_opts_pi) {
298 struct nd_opt_hdr *pt;
299 struct nd_opt_prefix_info *pi = NULL;
302 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
303 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
304 pt = (struct nd_opt_hdr *)((caddr_t)pt +
305 (pt->nd_opt_len << 3))) {
306 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
308 pi = (struct nd_opt_prefix_info *)pt;
310 if (pi->nd_opt_pi_len != 4) {
312 "nd6_ra_input: invalid option "
313 "len %d for prefix information option, "
314 "ignored\n", pi->nd_opt_pi_len));
318 if (128 < pi->nd_opt_pi_prefix_len) {
320 "nd6_ra_input: invalid prefix "
321 "len %d for prefix information option, "
322 "ignored\n", pi->nd_opt_pi_prefix_len));
326 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
327 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
329 "nd6_ra_input: invalid prefix "
331 ip6_sprintf(&pi->nd_opt_pi_prefix)));
335 bzero(&pr, sizeof(pr));
336 pr.ndpr_prefix.sin6_family = AF_INET6;
337 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
338 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
339 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
341 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
342 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
343 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
344 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
345 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
346 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
348 ntohl(pi->nd_opt_pi_preferred_time);
350 if (in6_init_prefix_ltimes(&pr))
351 continue; /* prefix lifetime init failed */
353 prelist_update(&pr, dr, m);
360 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
361 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
364 if (mtu < IPV6_MMTU) {
365 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
366 "mtu=%d sent from %s, ignoring\n",
367 mtu, ip6_sprintf(&ip6->ip6_src)));
373 if (mtu <= ndi->maxmtu) {
374 int change = (ndi->linkmtu != mtu);
377 if (change) /* in6_maxmtu may change */
380 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
381 "mtu=%d sent from %s; "
382 "exceeds maxmtu %d, ignoring\n",
383 mtu, ip6_sprintf(&ip6->ip6_src),
387 nd6log((LOG_INFO, "nd6_ra_input: mtu option "
388 "mtu=%d sent from %s; maxmtu unknown, "
390 mtu, ip6_sprintf(&ip6->ip6_src)));
397 * Source link layer address
403 if (ndopts.nd_opts_src_lladdr) {
404 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
405 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
408 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
410 "nd6_ra_input: lladdrlen mismatch for %s "
411 "(if %d, RA packet %d)\n",
412 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
416 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
419 * Installing a link-layer address might change the state of the
420 * router's neighbor cache, which might also affect our on-link
421 * detection of adveritsed prefixes.
423 pfxlist_onlink_check();
431 icmp6stat.icp6s_badra++;
436 * default router list proccessing sub routines
440 /* tell the change to user processes watching the routing socket. */
442 nd6_rtmsg(int cmd, struct rtentry *rt)
444 struct rt_addrinfo info;
446 bzero((caddr_t)&info, sizeof(info));
447 info.rti_info[RTAX_DST] = rt_key(rt);
448 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
449 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
450 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) {
451 info.rti_info[RTAX_IFP] = NULL;
453 info.rti_info[RTAX_IFP] =
455 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa;
457 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
459 rt_missmsg(cmd, &info, rt->rt_flags, 0);
464 defrouter_addreq(struct nd_defrouter *new)
466 struct sockaddr_in6 def, mask, gate;
468 bzero(&def, sizeof(def));
469 bzero(&mask, sizeof(mask));
470 bzero(&gate, sizeof(gate));
472 def.sin6_len = mask.sin6_len = gate.sin6_len
473 = sizeof(struct sockaddr_in6);
474 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
475 gate.sin6_addr = new->rtaddr;
477 rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
478 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
483 /* Add a route to a given interface as default */
485 defrouter_addifreq(struct ifnet *ifp)
487 struct sockaddr_in6 def, mask;
491 bzero(&def, sizeof(def));
492 bzero(&mask, sizeof(mask));
494 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
495 def.sin6_family = mask.sin6_family = AF_INET6;
498 * Search for an ifaddr beloging to the specified interface.
499 * XXX: An IPv6 address are required to be assigned on the interface.
501 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
502 nd6log((LOG_ERR, /* better error? */
503 "defrouter_addifreq: failed to find an ifaddr "
504 "to install a route to interface %s\n",
509 flags = ifa->ifa_flags;
510 error = rtrequest_global(RTM_ADD,
511 (struct sockaddr *)&def,
513 (struct sockaddr *)&mask,
517 "defrouter_addifreq: failed to install a route to "
518 "interface %s (errno = %d)\n",
519 if_name(ifp), error));
523 struct nd_defrouter *
524 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
526 struct nd_defrouter *dr;
528 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
529 dr = TAILQ_NEXT(dr, dr_entry)) {
530 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
534 return (NULL); /* search failed */
538 defrouter_delreq(struct nd_defrouter *dr, int dofree)
540 struct sockaddr_in6 def, mask, gate;
542 bzero(&def, sizeof(def));
543 bzero(&mask, sizeof(mask));
544 bzero(&gate, sizeof(gate));
546 def.sin6_len = mask.sin6_len = gate.sin6_len
547 = sizeof(struct sockaddr_in6);
548 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
549 gate.sin6_addr = dr->rtaddr;
551 rtrequest_global(RTM_DELETE,
552 (struct sockaddr *)&def,
553 (struct sockaddr *)&gate,
554 (struct sockaddr *)&mask,
556 if (dofree) /* XXX: necessary? */
561 defrtrlist_del(struct nd_defrouter *dr)
563 struct nd_defrouter *deldr = NULL;
564 struct nd_prefix *pr;
567 * Flush all the routing table entries that use the router
570 if (!ip6_forwarding && ip6_accept_rtadv) {
571 /* above is a good condition? */
572 rt6_flush(&dr->rtaddr, dr->ifp);
575 if (dr == TAILQ_FIRST(&nd_defrouter))
576 deldr = dr; /* The router is primary. */
578 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
581 * Also delete all the pointers to the router in each prefix lists.
583 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
584 struct nd_pfxrouter *pfxrtr;
585 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
588 pfxlist_onlink_check();
591 * If the router is the primary one, choose a new one.
592 * Note that defrouter_select() will remove the current gateway
593 * from the routing table.
602 * Default Router Selection according to Section 6.3.6 of RFC 2461:
603 * 1) Routers that are reachable or probably reachable should be
605 * 2) When no routers on the list are known to be reachable or
606 * probably reachable, routers SHOULD be selected in a round-robin
608 * 3) If the Default Router List is empty, assume that all
609 * destinations are on-link.
612 defrouter_select(void)
614 struct nd_defrouter *dr, anydr;
615 struct rtentry *rt = NULL;
616 struct llinfo_nd6 *ln = NULL;
621 * Search for a (probably) reachable router from the list.
623 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
624 dr = TAILQ_NEXT(dr, dr_entry)) {
625 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
626 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
627 ND6_IS_LLINFO_PROBREACH(ln)) {
628 /* Got it, and move it to the head */
629 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
630 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
635 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
637 * De-install the previous default gateway and install
639 * Note that if there is no reachable router in the list,
640 * the head entry will be used anyway.
641 * XXX: do we have to check the current routing table entry?
643 bzero(&anydr, sizeof(anydr));
644 defrouter_delreq(&anydr, 0);
645 defrouter_addreq(dr);
649 * The Default Router List is empty, so install the default
650 * route to an inteface.
651 * XXX: The specification does not say this mechanism should
652 * be restricted to hosts, but this would be not useful
653 * (even harmful) for routers.
655 if (!ip6_forwarding) {
657 * De-install the current default route
660 bzero(&anydr, sizeof(anydr));
661 defrouter_delreq(&anydr, 0);
664 * Install a route to the default interface
666 * XXX: we enable this for host only, because
667 * this may override a default route installed
668 * a user process (e.g. routing daemon) in a
671 defrouter_addifreq(nd6_defifp);
673 nd6log((LOG_INFO, "defrouter_select: "
674 "there's no default router and no default"
679 mtx_unlock(&nd6_mtx);
683 static struct nd_defrouter *
684 defrtrlist_update(struct nd_defrouter *new)
686 struct nd_defrouter *dr, *n;
690 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
692 if (new->rtlifetime == 0) {
697 dr->flags = new->flags; /* xxx flag check */
698 dr->rtlifetime = new->rtlifetime;
699 dr->expire = new->expire;
701 mtx_unlock(&nd6_mtx);
705 /* entry does not exist */
706 if (new->rtlifetime == 0) {
707 mtx_unlock(&nd6_mtx);
711 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP,
714 mtx_unlock(&nd6_mtx);
720 * Insert the new router at the end of the Default Router List.
721 * If there is no other router, install it anyway. Otherwise,
722 * just continue to use the current default router.
724 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
725 if (TAILQ_FIRST(&nd_defrouter) == n)
727 mtx_unlock(&nd6_mtx);
731 static struct nd_pfxrouter *
732 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
734 struct nd_pfxrouter *search;
736 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
737 if (search->router == dr)
745 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
747 struct nd_pfxrouter *new;
749 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT | M_ZERO);
752 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
754 pfxlist_onlink_check();
758 pfxrtr_del(struct nd_pfxrouter *pfr)
760 LIST_REMOVE(pfr, pfr_entry);
761 kfree(pfr, M_IP6NDP);
765 nd6_prefix_lookup(struct nd_prefix *pr)
767 struct nd_prefix *search;
769 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
770 if (pr->ndpr_ifp == search->ndpr_ifp &&
771 pr->ndpr_plen == search->ndpr_plen &&
772 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
773 &search->ndpr_prefix.sin6_addr,
784 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr,
785 struct nd_prefix **newp)
787 struct nd_prefix *new = NULL;
790 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT);
796 LIST_INIT(&new->ndpr_advrtrs);
797 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
798 /* make prefix in the canonical form */
799 for (i = 0; i < 4; i++)
800 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
801 new->ndpr_mask.s6_addr32[i];
804 /* link ndpr_entry to nd_prefix list */
805 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
806 mtx_unlock(&nd6_mtx);
808 /* ND_OPT_PI_FLAG_ONLINK processing */
809 if (new->ndpr_raf_onlink) {
812 if ((e = nd6_prefix_onlink(new)) != 0) {
813 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
814 "the prefix %s/%d on-link on %s (errno=%d)\n",
815 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
816 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
817 /* proceed anyway. XXX: is it correct? */
829 prelist_remove(struct nd_prefix *pr)
831 struct nd_pfxrouter *pfr, *next;
834 /* make sure to invalidate the prefix until it is really freed. */
839 * Though these flags are now meaningless, we'd rather keep the value
840 * not to confuse users when executing "ndp -p".
842 pr->ndpr_raf_onlink = 0;
843 pr->ndpr_raf_auto = 0;
845 if ((pr->ndpr_stateflags & NDPRF_ONLINK) &&
846 (e = nd6_prefix_offlink(pr)) != 0) {
847 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
849 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
850 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
851 /* what should we do? */
854 if (pr->ndpr_refcnt > 0)
855 return; /* notice here? */
859 /* unlink ndpr_entry from nd_prefix list */
860 LIST_REMOVE(pr, ndpr_entry);
862 /* free list of routers that adversed the prefix */
863 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
864 next = pfr->pfr_next;
866 kfree(pfr, M_IP6NDP);
868 mtx_unlock(&nd6_mtx);
872 pfxlist_onlink_check();
880 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m)
882 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
883 struct ifaddr_container *ifac;
884 struct ifnet *ifp = new->ndpr_ifp;
885 struct nd_prefix *pr;
888 struct in6_addrlifetime lt6_tmp;
894 * Authenticity for NA consists authentication for
895 * both IP header and IP datagrams, doesn't it ?
897 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
898 auth = (m->m_flags & M_AUTHIPHDR
899 && m->m_flags & M_AUTHIPDGM) ? 1 : 0;
904 if ((pr = nd6_prefix_lookup(new)) != NULL) {
906 * nd6_prefix_lookup() ensures that pr and new have the same
907 * prefix on a same interface.
911 * Update prefix information. Note that the on-link (L) bit
912 * and the autonomous (A) bit should NOT be changed from 1
915 if (new->ndpr_raf_onlink == 1)
916 pr->ndpr_raf_onlink = 1;
917 if (new->ndpr_raf_auto == 1)
918 pr->ndpr_raf_auto = 1;
919 if (new->ndpr_raf_onlink) {
920 pr->ndpr_vltime = new->ndpr_vltime;
921 pr->ndpr_pltime = new->ndpr_pltime;
922 pr->ndpr_preferred = new->ndpr_preferred;
923 pr->ndpr_expire = new->ndpr_expire;
926 if (new->ndpr_raf_onlink &&
927 !(pr->ndpr_stateflags & NDPRF_ONLINK)) {
930 if ((e = nd6_prefix_onlink(pr)) != 0) {
932 "prelist_update: failed to make "
933 "the prefix %s/%d on-link on %s "
935 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
936 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
937 /* proceed anyway. XXX: is it correct? */
941 if (dr && pfxrtr_lookup(pr, dr) == NULL)
944 struct nd_prefix *newpr = NULL;
946 if (new->ndpr_vltime == 0)
948 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
951 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
953 error = nd6_prelist_add(new, dr, &newpr);
954 if (error != 0 || newpr == NULL) {
955 nd6log((LOG_NOTICE, "prelist_update: "
956 "nd6_prelist_add failed for %s/%d on %s "
957 "errno=%d, returnpr=%p\n",
958 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
959 new->ndpr_plen, if_name(new->ndpr_ifp),
961 goto end; /* we should just give up in this case. */
965 * XXX: from the ND point of view, we can ignore a prefix
966 * with the on-link bit being zero. However, we need a
967 * prefix structure for references from autoconfigured
968 * addresses. Thus, we explicitly make suret that the prefix
969 * itself expires now.
971 if (newpr->ndpr_raf_onlink == 0) {
972 newpr->ndpr_vltime = 0;
973 newpr->ndpr_pltime = 0;
974 in6_init_prefix_ltimes(newpr);
981 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
982 * Note that pr must be non NULL at this point.
985 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
986 if (!new->ndpr_raf_auto)
990 * 5.5.3 (b). the link-local prefix should have been ignored in
995 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
996 * This should have been done in nd6_ra_input.
1000 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1001 * address already in the list, and the Valid Lifetime is not 0,
1002 * form an address. Note that even a manually configured address
1003 * should reject autoconfiguration of a new address.
1005 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1006 struct ifaddr *ifa = ifac->ifa;
1007 struct in6_ifaddr *ifa6;
1009 u_int32_t storedlifetime;
1011 if (ifa->ifa_addr->sa_family != AF_INET6)
1014 ifa6 = (struct in6_ifaddr *)ifa;
1017 * Spec is not clear here, but I believe we should concentrate
1018 * on unicast (i.e. not anycast) addresses.
1019 * XXX: other ia6_flags? detached or duplicated?
1021 if (ifa6->ia6_flags & IN6_IFF_ANYCAST)
1024 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1025 if (ifa_plen != new->ndpr_plen ||
1026 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1027 &new->ndpr_prefix.sin6_addr,
1031 if (ia6_match == NULL) /* remember the first one */
1034 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1038 * An already autoconfigured address matched. Now that we
1039 * are sure there is at least one matched address, we can
1040 * proceed to 5.5.3. (e): update the lifetimes according to the
1041 * "two hours" rule and the privacy extension.
1043 #define TWOHOUR (120*60)
1044 lt6_tmp = ifa6->ia6_lifetime;
1046 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1047 storedlifetime = ND6_INFINITE_LIFETIME;
1048 else if (IFA6_IS_INVALID(ifa6))
1051 storedlifetime = lt6_tmp.ia6t_expire - time_uptime;
1053 /* when not updating, keep the current stored lifetime. */
1054 lt6_tmp.ia6t_vltime = storedlifetime;
1056 if (TWOHOUR < new->ndpr_vltime ||
1057 storedlifetime < new->ndpr_vltime) {
1058 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1059 } else if (storedlifetime <= TWOHOUR
1062 * This condition is logically redundant, so we just
1064 * See IPng 6712, 6717, and 6721.
1066 && new->ndpr_vltime <= storedlifetime
1070 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1074 * new->ndpr_vltime <= TWOHOUR &&
1075 * TWOHOUR < storedlifetime
1077 lt6_tmp.ia6t_vltime = TWOHOUR;
1080 /* The 2 hour rule is not imposed for preferred lifetime. */
1081 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1083 in6_init_address_ltimes(pr, <6_tmp);
1086 * When adjusting the lifetimes of an existing temporary
1087 * address, only lower the lifetimes.
1088 * RFC 3041 3.3. (1).
1089 * XXX: how should we modify ia6t_[pv]ltime?
1091 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) {
1092 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1093 lt6_tmp.ia6t_expire >
1094 ifa6->ia6_lifetime.ia6t_expire) {
1095 lt6_tmp.ia6t_expire =
1096 ifa6->ia6_lifetime.ia6t_expire;
1098 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1099 lt6_tmp.ia6t_preferred >
1100 ifa6->ia6_lifetime.ia6t_preferred) {
1101 lt6_tmp.ia6t_preferred =
1102 ifa6->ia6_lifetime.ia6t_preferred;
1106 ifa6->ia6_lifetime = lt6_tmp;
1108 if (ia6_match == NULL && new->ndpr_vltime) {
1110 * No address matched and the valid lifetime is non-zero.
1111 * Create a new address.
1113 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1115 * note that we should use pr (not new) for reference.
1121 /* XXXYYY Don't do this, according to Jinmei. */
1122 pr->ndpr_addr = new->ndpr_addr;
1127 * When a new public address is created as described
1128 * in RFC2462, also create a new temporary address.
1131 * When an interface connects to a new link, a new
1132 * randomized interface identifier should be generated
1133 * immediately together with a new set of temporary
1134 * addresses. Thus, we specifiy 1 as the 2nd arg of
1137 if (ip6_use_tempaddr) {
1139 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1140 nd6log((LOG_NOTICE, "prelist_update: "
1141 "failed to create a temporary "
1142 "address, errno=%d\n",
1148 * A newly added address might affect the status
1149 * of other addresses, so we check and update it.
1150 * XXX: what if address duplication happens?
1152 pfxlist_onlink_check();
1154 /* just set an error. do not bark here. */
1155 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1162 mtx_unlock(&nd6_mtx);
1167 * A supplement function used in the on-link detection below;
1168 * detect if a given prefix has a (probably) reachable advertising router.
1169 * XXX: lengthy function name...
1171 static struct nd_pfxrouter *
1172 find_pfxlist_reachable_router(struct nd_prefix *pr)
1174 struct nd_pfxrouter *pfxrtr;
1176 struct llinfo_nd6 *ln;
1178 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1179 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1180 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1181 pfxrtr->router->ifp)) &&
1182 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1183 ND6_IS_LLINFO_PROBREACH(ln))
1192 * Check if each prefix in the prefix list has at least one available router
1193 * that advertised the prefix (a router is "available" if its neighbor cache
1194 * entry is reachable or probably reachable).
1195 * If the check fails, the prefix may be off-link, because, for example,
1196 * we have moved from the network but the lifetime of the prefix has not
1197 * expired yet. So we should not use the prefix if there is another prefix
1198 * that has an available router.
1199 * But, if there is no prefix that has an available router, we still regards
1200 * all the prefixes as on-link. This is because we can't tell if all the
1201 * routers are simply dead or if we really moved from the network and there
1202 * is no router around us.
1205 pfxlist_onlink_check(void)
1207 struct nd_prefix *pr;
1208 struct in6_ifaddr *ifa;
1211 * Check if there is a prefix that has a reachable advertising
1214 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1215 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1221 * There is at least one prefix that has a reachable router.
1222 * Detach prefixes which have no reachable advertising
1223 * router, and attach other prefixes.
1225 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1226 /* XXX: a link-local prefix should never be detached */
1227 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1231 * we aren't interested in prefixes without the L bit
1234 if (pr->ndpr_raf_onlink == 0)
1237 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1238 find_pfxlist_reachable_router(pr) == NULL)
1239 pr->ndpr_stateflags |= NDPRF_DETACHED;
1240 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1241 find_pfxlist_reachable_router(pr) != NULL)
1242 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1245 /* there is no prefix that has a reachable router */
1246 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1247 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1250 if (pr->ndpr_raf_onlink == 0)
1253 if (pr->ndpr_stateflags & NDPRF_DETACHED)
1254 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1259 * Remove each interface route associated with a (just) detached
1260 * prefix, and reinstall the interface route for a (just) attached
1261 * prefix. Note that all attempt of reinstallation does not
1262 * necessarily success, when a same prefix is shared among multiple
1263 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1264 * so we don't have to care about them.
1266 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1269 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1272 if (pr->ndpr_raf_onlink == 0)
1275 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1276 (pr->ndpr_stateflags & NDPRF_ONLINK)) {
1277 if ((e = nd6_prefix_offlink(pr)) != 0) {
1279 "pfxlist_onlink_check: failed to "
1280 "make %s/%d offlink, errno=%d\n",
1281 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1285 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1286 !(pr->ndpr_stateflags & NDPRF_ONLINK) &&
1287 pr->ndpr_raf_onlink) {
1288 if ((e = nd6_prefix_onlink(pr)) != 0) {
1290 "pfxlist_onlink_check: failed to "
1291 "make %s/%d offlink, errno=%d\n",
1292 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1299 * Changes on the prefix status might affect address status as well.
1300 * Make sure that all addresses derived from an attached prefix are
1301 * attached, and that all addresses derived from a detached prefix are
1302 * detached. Note, however, that a manually configured address should
1303 * always be attached.
1304 * The precise detection logic is same as the one for prefixes.
1306 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1307 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1310 if (ifa->ia6_ndpr == NULL) {
1312 * This can happen when we first configure the address
1313 * (i.e. the address exists, but the prefix does not).
1314 * XXX: complicated relationships...
1319 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1323 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1324 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1327 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1330 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1331 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1333 ifa->ia6_flags |= IN6_IFF_DETACHED;
1337 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1338 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1341 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1347 nd6_prefix_onlink(struct nd_prefix *pr)
1350 struct ifnet *ifp = pr->ndpr_ifp;
1351 struct sockaddr_in6 mask6;
1352 struct nd_prefix *opr;
1357 if (pr->ndpr_stateflags & NDPRF_ONLINK) {
1359 "nd6_prefix_onlink: %s/%d is already on-link\n",
1360 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1365 * Add the interface route associated with the prefix. Before
1366 * installing the route, check if there's the same prefix on another
1367 * interface, and the prefix has already installed the interface route.
1368 * Although such a configuration is expected to be rare, we explicitly
1371 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1375 if (!(opr->ndpr_stateflags & NDPRF_ONLINK))
1378 if (opr->ndpr_plen == pr->ndpr_plen &&
1379 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1380 &opr->ndpr_prefix.sin6_addr,
1386 * We prefer link-local addresses as the associated interface address.
1388 /* search for a link-local addr */
1389 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1393 struct ifaddr_container *ifac;
1395 /* XXX: freebsd does not have ifa_ifwithaf */
1396 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1397 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) {
1402 /* should we care about ia6_flags? */
1406 * This can still happen, when, for example, we receive an RA
1407 * containing a prefix with the L bit set and the A bit clear,
1408 * after removing all IPv6 addresses on the receiving
1409 * interface. This should, of course, be rare though.
1412 "nd6_prefix_onlink: failed to find any ifaddr"
1413 " to add route for a prefix(%s/%d) on %s\n",
1414 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1415 pr->ndpr_plen, if_name(ifp)));
1420 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1421 * ifa->ifa_rtrequest = nd6_rtrequest;
1423 bzero(&mask6, sizeof(mask6));
1424 mask6.sin6_len = sizeof(mask6);
1425 mask6.sin6_addr = pr->ndpr_mask;
1426 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1427 if (nd6_need_cache(ifp)) {
1428 /* explicitly set in case ifa_flags does not set the flag. */
1429 rtflags |= RTF_CLONING;
1432 * explicitly clear the cloning bit in case ifa_flags sets it.
1434 rtflags &= ~RTF_CLONING;
1436 error = rtrequest_global(RTM_ADD,
1437 (struct sockaddr *)&pr->ndpr_prefix,
1439 (struct sockaddr *)&mask6,
1442 pr->ndpr_stateflags |= NDPRF_ONLINK;
1445 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1446 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1448 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1449 pr->ndpr_plen, if_name(ifp),
1450 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1451 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1457 nd6_prefix_offlink(struct nd_prefix *pr)
1460 struct ifnet *ifp = pr->ndpr_ifp;
1461 struct nd_prefix *opr;
1462 struct sockaddr_in6 sa6, mask6;
1465 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
1467 "nd6_prefix_offlink: %s/%d is already off-link\n",
1468 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1472 bzero(&sa6, sizeof(sa6));
1473 sa6.sin6_family = AF_INET6;
1474 sa6.sin6_len = sizeof(sa6);
1475 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1476 sizeof(struct in6_addr));
1477 bzero(&mask6, sizeof(mask6));
1478 mask6.sin6_family = AF_INET6;
1479 mask6.sin6_len = sizeof(sa6);
1480 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1481 error = rtrequest_global(RTM_DELETE,
1482 (struct sockaddr *)&sa6,
1484 (struct sockaddr *)&mask6,
1487 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1490 * There might be the same prefix on another interface,
1491 * the prefix which could not be on-link just because we have
1492 * the interface route (see comments in nd6_prefix_onlink).
1493 * If there's one, try to make the prefix on-link on the
1496 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1500 if (opr->ndpr_stateflags & NDPRF_ONLINK)
1504 * KAME specific: detached prefixes should not be
1507 if (opr->ndpr_stateflags & NDPRF_DETACHED)
1510 if (opr->ndpr_plen == pr->ndpr_plen &&
1511 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1512 &opr->ndpr_prefix.sin6_addr,
1516 if ((e = nd6_prefix_onlink(opr)) != 0) {
1518 "nd6_prefix_offlink: failed to "
1519 "recover a prefix %s/%d from %s "
1520 "to %s (errno = %d)\n",
1521 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1522 opr->ndpr_plen, if_name(ifp),
1523 if_name(opr->ndpr_ifp), e));
1529 /* XXX: can we still set the NDPRF_ONLINK flag? */
1531 "nd6_prefix_offlink: failed to delete route: "
1532 "%s/%d on %s (errno = %d)\n",
1533 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1542 * ifid: Mobile IPv6 addition
1544 static struct in6_ifaddr *
1545 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid)
1547 struct ifnet *ifp = pr->ndpr_ifp;
1549 struct in6_aliasreq ifra;
1550 struct in6_ifaddr *ia, *ib;
1552 struct in6_addr mask;
1553 int prefixlen = pr->ndpr_plen;
1555 in6_len2mask(&mask, prefixlen);
1558 * find a link-local address (will be interface ID).
1559 * Is it really mandatory? Theoretically, a global or a site-local
1560 * address can be configured without a link-local address, if we
1561 * have a unique interface identifier...
1563 * it is not mandatory to have a link-local address, we can generate
1564 * interface identifier on the fly. we do this because:
1565 * (1) it should be the easiest way to find interface identifier.
1566 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1567 * for multiple addresses on a single interface, and possible shortcut
1568 * of DAD. we omitted DAD for this reason in the past.
1569 * (3) a user can prevent autoconfiguration of global address
1570 * by removing link-local address by hand (this is partly because we
1571 * don't have other way to control the use of IPv6 on a interface.
1572 * this has been our design choice - cf. NRL's "ifconfig auto").
1573 * (4) it is easier to manage when an interface has addresses
1574 * with the same interface identifier, than to have multiple addresses
1575 * with different interface identifiers.
1577 * Mobile IPv6 addition: allow for caller to specify a wished interface
1578 * ID. This is to not break connections when moving addresses between
1581 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */
1583 ib = (struct in6_ifaddr *)ifa;
1587 #if 0 /* don't care link local addr state, and always do DAD */
1588 /* if link-local address is not eligible, do not autoconfigure. */
1589 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1590 kprintf("in6_ifadd: link-local address not ready\n");
1595 /* prefixlen + ifidlen must be equal to 128 */
1596 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1597 if (prefixlen != plen0) {
1598 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1599 "(prefix=%d ifid=%d)\n",
1600 if_name(ifp), prefixlen, 128 - plen0));
1606 bzero(&ifra, sizeof(ifra));
1608 * in6_update_ifa() does not use ifra_name, but we accurately set it
1611 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1612 ifra.ifra_addr.sin6_family = AF_INET6;
1613 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1615 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1616 sizeof(ifra.ifra_addr.sin6_addr));
1617 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1618 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1619 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1620 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1623 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1624 ifid = &ib->ia_addr.sin6_addr;
1625 ifra.ifra_addr.sin6_addr.s6_addr32[0]
1626 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1627 ifra.ifra_addr.sin6_addr.s6_addr32[1]
1628 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1629 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1630 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1631 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1632 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1634 /* new prefix mask. */
1635 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1636 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1637 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1638 sizeof(ifra.ifra_prefixmask.sin6_addr));
1642 * XXX: in6_init_address_ltimes would override these values later.
1643 * We should reconsider this logic.
1645 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1646 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1648 /* XXX: scope zone ID? */
1650 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1652 * temporarily set the nopfx flag to avoid conflict.
1653 * XXX: we should reconsider the entire mechanism about prefix
1656 ifra.ifra_flags |= IN6_IFF_NOPFX;
1659 * keep the new address, regardless of the result of in6_update_ifa.
1660 * XXX: this address is now meaningless.
1661 * We should reconsider its role.
1663 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1665 /* allocate ifaddr structure, link into chain, etc. */
1666 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1668 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1669 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1671 return (NULL); /* ifaddr must not have been allocated. */
1674 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1676 return (ia); /* this must NOT be NULL. */
1681 * ia0: corresponding public address
1684 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen)
1686 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1687 struct in6_ifaddr *newia;
1688 struct in6_aliasreq ifra;
1690 int trylimit = 3; /* XXX: adhoc value */
1691 u_int32_t randid[2];
1692 time_t vltime0, pltime0;
1694 bzero(&ifra, sizeof(ifra));
1695 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1696 ifra.ifra_addr = ia0->ia_addr;
1697 /* copy prefix mask */
1698 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1699 /* clear the old IFID */
1700 for (i = 0; i < 4; i++) {
1701 ifra.ifra_addr.sin6_addr.s6_addr32[i]
1702 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1706 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1707 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8],
1709 ifra.ifra_addr.sin6_addr.s6_addr32[2]
1710 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1711 ifra.ifra_addr.sin6_addr.s6_addr32[3]
1712 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1715 * If by chance the new temporary address is the same as an address
1716 * already assigned to the interface, generate a new randomized
1717 * interface identifier and repeat this step.
1720 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1721 if (trylimit-- == 0) {
1722 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1723 "a unique random IFID\n"));
1731 * The Valid Lifetime is the lower of the Valid Lifetime of the
1732 * public address or TEMP_VALID_LIFETIME.
1733 * The Preferred Lifetime is the lower of the Preferred Lifetime
1734 * of the public address or TEMP_PREFERRED_LIFETIME -
1737 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1738 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1739 (ia0->ia6_lifetime.ia6t_expire - time_uptime);
1740 if (vltime0 > ip6_temp_valid_lifetime)
1741 vltime0 = ip6_temp_valid_lifetime;
1743 vltime0 = ip6_temp_valid_lifetime;
1744 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1745 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1746 (ia0->ia6_lifetime.ia6t_preferred - time_uptime);
1747 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
1748 pltime0 = ip6_temp_preferred_lifetime -
1752 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1753 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1754 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1757 * A temporary address is created only if this calculated Preferred
1758 * Lifetime is greater than REGEN_ADVANCE time units.
1760 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1763 /* XXX: scope zone ID? */
1765 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1767 /* allocate ifaddr structure, link into chain, etc. */
1768 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1771 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1772 if (newia == NULL) { /* XXX: can it happen? */
1774 "in6_tmpifadd: ifa update succeeded, but we got "
1776 return (EINVAL); /* XXX */
1778 newia->ia6_ndpr = ia0->ia6_ndpr;
1779 newia->ia6_ndpr->ndpr_refcnt++;
1785 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1787 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1788 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1789 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1790 "(%d) is greater than valid lifetime(%d)\n",
1791 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1794 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1795 ndpr->ndpr_preferred = 0;
1797 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1798 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1799 ndpr->ndpr_expire = 0;
1801 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1807 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1809 /* init ia6t_expire */
1810 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1811 lt6->ia6t_expire = 0;
1813 lt6->ia6t_expire = time_uptime;
1814 lt6->ia6t_expire += lt6->ia6t_vltime;
1817 /* init ia6t_preferred */
1818 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1819 lt6->ia6t_preferred = 0;
1821 lt6->ia6t_preferred = time_uptime;
1822 lt6->ia6t_preferred += lt6->ia6t_pltime;
1827 * Delete all the routing table entries that use the specified gateway.
1829 * XXX: this function causes search through all entries of routing table, so
1830 * it shouldn't be called when acting as a router.
1833 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
1835 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6];
1837 /* We'll care only link-local addresses */
1838 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
1840 /* XXX: hack for KAME's link-local address kludge */
1841 gateway->s6_addr16[1] = htons(ifp->if_index);
1843 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1847 rt6_deleteroute(struct radix_node *rn, void *arg)
1849 #define SIN6(s) ((struct sockaddr_in6 *)s)
1850 struct rtentry *rt = (struct rtentry *)rn;
1851 struct in6_addr *gate = (struct in6_addr *)arg;
1853 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1856 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1860 * Do not delete a static route.
1861 * XXX: this seems to be a bit ad-hoc. Should we consider the
1862 * 'cloned' bit instead?
1864 if (rt->rt_flags & RTF_STATIC)
1868 * We delete only host route. This means, in particular, we don't
1869 * delete default route.
1871 if (!(rt->rt_flags & RTF_HOST))
1874 return (rtrequest(RTM_DELETE, rt_key(rt),
1875 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0));
1880 nd6_setdefaultiface(int ifindex)
1884 if (ifindex < 0 || if_index < ifindex)
1887 if (nd6_defifindex != ifindex) {
1888 nd6_defifindex = ifindex;
1889 if (nd6_defifindex > 0)
1890 nd6_defifp = ifindex2ifnet[nd6_defifindex];
1895 * If the Default Router List is empty, install a route
1896 * to the specified interface as default or remove the default
1897 * route when the default interface becomes canceled.
1898 * The check for the queue is actually redundant, but
1899 * we do this here to avoid re-install the default route
1900 * if the list is NOT empty.
1902 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1906 * Our current implementation assumes one-to-one maping between
1907 * interfaces and links, so it would be natural to use the
1908 * default interface as the default link.
1910 scope6_setdefault(nd6_defifp);