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/mutex2.h>
53 #include <net/if_types.h>
54 #include <net/if_dl.h>
55 #include <net/route.h>
56 #include <net/radix.h>
58 #include <netinet/in.h>
59 #include <netinet6/in6_var.h>
60 #include <netinet6/in6_ifattach.h>
61 #include <netinet/ip6.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/nd6.h>
64 #include <netinet/icmp6.h>
65 #include <netinet6/scope6_var.h>
67 #include <net/net_osdep.h>
69 #define SDL(s) ((struct sockaddr_dl *)s)
71 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *);
72 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *,
74 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *,
75 struct nd_defrouter *);
76 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *);
77 static void pfxrtr_del (struct nd_pfxrouter *);
78 static struct nd_pfxrouter *find_pfxlist_reachable_router
80 static void defrouter_addifreq (struct ifnet *);
82 static void in6_init_address_ltimes(struct nd_prefix *ndpr,
83 struct in6_addrlifetime *lt6);
85 static int rt6_deleteroute (struct radix_node *, void *);
87 extern int nd6_recalc_reachtm_interval;
89 static struct ifnet *nd6_defifp;
92 int ip6_use_tempaddr = 0;
94 int ip6_desync_factor;
95 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME;
96 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME;
98 * shorter lifetimes for debugging purposes.
99 int ip6_temp_preferred_lifetime = 800;
100 static int ip6_temp_valid_lifetime = 1800;
102 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE;
105 * Receive Router Solicitation Message - just for routers.
106 * Router solicitation/advertisement is mostly managed by userland program
107 * (rtadvd) so here we have no function like nd6_ra_output().
112 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
114 struct ifnet *ifp = m->m_pkthdr.rcvif;
115 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
116 struct nd_router_solicit *nd_rs;
117 struct in6_addr saddr6 = ip6->ip6_src;
121 struct sockaddr_dl *sdl = NULL;
122 struct llinfo_nd6 *ln = NULL;
123 struct rtentry *rt = NULL;
126 union nd_opts ndopts;
128 /* If I'm not a router, ignore it. */
129 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1)
133 if (ip6->ip6_hlim != 255) {
135 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
136 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
137 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
142 * Don't update the neighbor cache, if src = ::.
143 * This indicates that the src has no IP address assigned yet.
145 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
148 #ifndef PULLDOWN_TEST
149 IP6_EXTHDR_CHECK(m, off, icmp6len,);
150 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
152 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
154 icmp6stat.icp6s_tooshort++;
159 icmp6len -= sizeof(*nd_rs);
160 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
161 if (nd6_options(&ndopts) < 0) {
163 "nd6_rs_input: invalid ND option, ignored\n"));
164 /* nd6_options have incremented stats */
168 if (ndopts.nd_opts_src_lladdr) {
169 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
170 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
173 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
175 "nd6_rs_input: lladdrlen mismatch for %s "
176 "(if %d, RS packet %d)\n",
177 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
181 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
188 icmp6stat.icp6s_badrs++;
193 * Receive Router Advertisement Message.
196 * TODO: on-link bit on prefix information
197 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
200 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
202 struct ifnet *ifp = m->m_pkthdr.rcvif;
203 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
204 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
205 struct nd_router_advert *nd_ra;
206 struct in6_addr saddr6 = ip6->ip6_src;
208 struct in6_addr daddr6 = ip6->ip6_dst;
209 int flags; /* = nd_ra->nd_ra_flags_reserved; */
210 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0);
211 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0);
213 union nd_opts ndopts;
214 struct nd_defrouter *dr;
217 * We only accept RAs only when
218 * the system-wide variable allows the acceptance, and
219 * per-interface variable allows RAs on the receiving interface.
221 if (ip6_accept_rtadv == 0)
223 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
226 if (ip6->ip6_hlim != 255) {
228 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
229 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
230 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
234 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
236 "nd6_ra_input: src %s is not link-local\n",
237 ip6_sprintf(&saddr6)));
241 #ifndef PULLDOWN_TEST
242 IP6_EXTHDR_CHECK(m, off, icmp6len,);
243 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
245 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
247 icmp6stat.icp6s_tooshort++;
252 icmp6len -= sizeof(*nd_ra);
253 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
254 if (nd6_options(&ndopts) < 0) {
256 "nd6_ra_input: invalid ND option, ignored\n"));
257 /* nd6_options have incremented stats */
262 struct nd_defrouter dr0;
263 u_int32_t advreachable = nd_ra->nd_ra_reachable;
266 dr0.flags = nd_ra->nd_ra_flags_reserved;
267 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
268 dr0.expire = time_uptime + dr0.rtlifetime;
270 dr0.advint = 0; /* Mobile IPv6 */
271 dr0.advint_expire = 0; /* Mobile IPv6 */
272 dr0.advints_lost = 0; /* Mobile IPv6 */
273 /* unspecified or not? (RFC 2461 6.3.4) */
275 advreachable = ntohl(advreachable);
276 if (advreachable <= MAX_REACHABLE_TIME &&
277 ndi->basereachable != advreachable) {
278 ndi->basereachable = advreachable;
279 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
280 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */
283 if (nd_ra->nd_ra_retransmit)
284 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
285 if (nd_ra->nd_ra_curhoplimit)
286 ndi->chlim = nd_ra->nd_ra_curhoplimit;
287 dr = defrtrlist_update(&dr0);
293 if (ndopts.nd_opts_pi) {
294 struct nd_opt_hdr *pt;
295 struct nd_opt_prefix_info *pi = NULL;
298 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
299 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
300 pt = (struct nd_opt_hdr *)((caddr_t)pt +
301 (pt->nd_opt_len << 3))) {
302 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
304 pi = (struct nd_opt_prefix_info *)pt;
306 if (pi->nd_opt_pi_len != 4) {
308 "nd6_ra_input: invalid option "
309 "len %d for prefix information option, "
310 "ignored\n", pi->nd_opt_pi_len));
314 if (128 < pi->nd_opt_pi_prefix_len) {
316 "nd6_ra_input: invalid prefix "
317 "len %d for prefix information option, "
318 "ignored\n", pi->nd_opt_pi_prefix_len));
322 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
323 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
325 "nd6_ra_input: invalid prefix "
327 ip6_sprintf(&pi->nd_opt_pi_prefix)));
331 bzero(&pr, sizeof(pr));
332 pr.ndpr_prefix.sin6_family = AF_INET6;
333 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
334 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
335 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
337 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
338 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
339 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
340 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
341 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
342 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
343 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
344 if (in6_init_prefix_ltimes(&pr))
345 continue; /* prefix lifetime init failed */
346 prelist_update(&pr, dr, m);
353 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
356 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
359 if (mtu < IPV6_MMTU) {
360 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
361 "mtu=%ld sent from %s, ignoring\n",
362 mtu, ip6_sprintf(&ip6->ip6_src)));
367 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) ?
368 ndi->maxmtu : ifp->if_mtu;
370 int change = (ndi->linkmtu != mtu);
373 if (change) /* in6_maxmtu may change */
376 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
377 "mtu=%lu sent from %s; "
378 "exceeds maxmtu %lu, ignoring\n",
379 mtu, ip6_sprintf(&ip6->ip6_src), maxmtu));
386 * Source link layer address
392 if (ndopts.nd_opts_src_lladdr) {
393 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
394 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
397 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
399 "nd6_ra_input: lladdrlen mismatch for %s "
400 "(if %d, RA packet %d)\n",
401 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2));
405 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0);
408 * Installing a link-layer address might change the state of the
409 * router's neighbor cache, which might also affect our on-link
410 * detection of adveritsed prefixes.
412 pfxlist_onlink_check();
420 icmp6stat.icp6s_badra++;
425 * default router list proccessing sub routines
429 /* tell the change to user processes watching the routing socket. */
431 nd6_rtmsg(int cmd, struct rtentry *rt)
433 struct rt_addrinfo info;
435 bzero((caddr_t)&info, sizeof(info));
436 info.rti_info[RTAX_DST] = rt_key(rt);
437 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
438 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
439 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) {
440 info.rti_info[RTAX_IFP] = NULL;
442 info.rti_info[RTAX_IFP] =
444 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa;
446 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
448 rt_missmsg(cmd, &info, rt->rt_flags, 0);
453 defrouter_addreq(struct nd_defrouter *new)
455 struct sockaddr_in6 def, mask, gate;
457 bzero(&def, sizeof(def));
458 bzero(&mask, sizeof(mask));
459 bzero(&gate, sizeof(gate));
461 def.sin6_len = mask.sin6_len = gate.sin6_len =
462 sizeof(struct sockaddr_in6);
463 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
464 gate.sin6_addr = new->rtaddr;
466 rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
467 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY);
471 /* Add a route to a given interface as default */
473 defrouter_addifreq(struct ifnet *ifp)
475 struct sockaddr_in6 def, mask;
479 bzero(&def, sizeof(def));
480 bzero(&mask, sizeof(mask));
482 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6);
483 def.sin6_family = mask.sin6_family = AF_INET6;
486 * Search for an ifaddr beloging to the specified interface.
487 * XXX: An IPv6 address are required to be assigned on the interface.
489 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) {
490 nd6log((LOG_ERR, /* better error? */
491 "defrouter_addifreq: failed to find an ifaddr "
492 "to install a route to interface %s\n",
497 flags = ifa->ifa_flags;
498 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&def,
499 ifa->ifa_addr, (struct sockaddr *)&mask, flags);
502 "defrouter_addifreq: failed to install a route to "
503 "interface %s (errno = %d)\n",
504 if_name(ifp), error));
508 struct nd_defrouter *
509 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
511 struct nd_defrouter *dr;
513 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
514 dr = TAILQ_NEXT(dr, dr_entry)) {
515 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
519 return (NULL); /* search failed */
523 defrouter_delreq(struct nd_defrouter *dr, int dofree)
525 struct sockaddr_in6 def, mask, gate;
527 bzero(&def, sizeof(def));
528 bzero(&mask, sizeof(mask));
529 bzero(&gate, sizeof(gate));
531 def.sin6_len = mask.sin6_len = gate.sin6_len =
532 sizeof(struct sockaddr_in6);
533 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6;
534 gate.sin6_addr = dr->rtaddr;
536 rtrequest_global(RTM_DELETE, (struct sockaddr *)&def,
537 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY);
538 if (dofree) /* XXX: necessary? */
543 defrtrlist_del(struct nd_defrouter *dr)
545 struct nd_defrouter *deldr = NULL;
546 struct nd_prefix *pr;
549 * Flush all the routing table entries that use the router
552 if (!ip6_forwarding && ip6_accept_rtadv) /* XXX: better condition? */
553 rt6_flush(&dr->rtaddr, dr->ifp);
555 if (dr == TAILQ_FIRST(&nd_defrouter))
556 deldr = dr; /* The router is primary. */
558 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
561 * Also delete all the pointers to the router in each prefix lists.
563 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
564 struct nd_pfxrouter *pfxrtr;
565 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
568 pfxlist_onlink_check();
571 * If the router is the primary one, choose a new one.
572 * Note that defrouter_select() will remove the current gateway
573 * from the routing table.
582 * Default Router Selection according to Section 6.3.6 of RFC 2461:
583 * 1) Routers that are reachable or probably reachable should be
585 * 2) When no routers on the list are known to be reachable or
586 * probably reachable, routers SHOULD be selected in a round-robin
588 * 3) If the Default Router List is empty, assume that all
589 * destinations are on-link.
592 defrouter_select(void)
594 struct nd_defrouter *dr, anydr;
595 struct rtentry *rt = NULL;
596 struct llinfo_nd6 *ln = NULL;
601 * Search for a (probably) reachable router from the list.
603 for (dr = TAILQ_FIRST(&nd_defrouter); dr;
604 dr = TAILQ_NEXT(dr, dr_entry)) {
605 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
606 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
607 ND6_IS_LLINFO_PROBREACH(ln)) {
608 /* Got it, and move it to the head */
609 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
610 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry);
615 if ((dr = TAILQ_FIRST(&nd_defrouter))) {
617 * De-install the previous default gateway and install
619 * Note that if there is no reachable router in the list,
620 * the head entry will be used anyway.
621 * XXX: do we have to check the current routing table entry?
623 bzero(&anydr, sizeof(anydr));
624 defrouter_delreq(&anydr, 0);
625 defrouter_addreq(dr);
629 * The Default Router List is empty, so install the default
630 * route to an inteface.
631 * XXX: The specification does not say this mechanism should
632 * be restricted to hosts, but this would be not useful
633 * (even harmful) for routers.
635 if (!ip6_forwarding) {
637 * De-install the current default route
640 bzero(&anydr, sizeof(anydr));
641 defrouter_delreq(&anydr, 0);
644 * Install a route to the default interface
646 * XXX: we enable this for host only, because
647 * this may override a default route installed
648 * a user process (e.g. routing daemon) in a
651 defrouter_addifreq(nd6_defifp);
653 nd6log((LOG_INFO, "defrouter_select: "
654 "there's no default router and no default"
659 mtx_unlock(&nd6_mtx);
663 static struct nd_defrouter *
664 defrtrlist_update(struct nd_defrouter *new)
666 struct nd_defrouter *dr, *n;
670 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
672 if (new->rtlifetime == 0) {
677 dr->flags = new->flags; /* xxx flag check */
678 dr->rtlifetime = new->rtlifetime;
679 dr->expire = new->expire;
681 mtx_unlock(&nd6_mtx);
685 /* entry does not exist */
686 if (new->rtlifetime == 0) {
687 mtx_unlock(&nd6_mtx);
691 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP,
694 mtx_unlock(&nd6_mtx);
700 * Insert the new router at the end of the Default Router List.
701 * If there is no other router, install it anyway. Otherwise,
702 * just continue to use the current default router.
704 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry);
705 if (TAILQ_FIRST(&nd_defrouter) == n)
707 mtx_unlock(&nd6_mtx);
711 static struct nd_pfxrouter *
712 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
714 struct nd_pfxrouter *search;
716 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
717 if (search->router == dr)
725 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
727 struct nd_pfxrouter *new;
729 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT | M_ZERO);
732 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
734 pfxlist_onlink_check();
738 pfxrtr_del(struct nd_pfxrouter *pfr)
740 LIST_REMOVE(pfr, pfr_entry);
741 kfree(pfr, M_IP6NDP);
745 nd6_prefix_lookup(struct nd_prefix *pr)
747 struct nd_prefix *search;
749 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) {
750 if (pr->ndpr_ifp == search->ndpr_ifp &&
751 pr->ndpr_plen == search->ndpr_plen &&
752 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
753 &search->ndpr_prefix.sin6_addr, pr->ndpr_plen))
761 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr,
762 struct nd_prefix **newp)
764 struct nd_prefix *new = NULL;
767 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT);
773 LIST_INIT(&new->ndpr_advrtrs);
774 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
775 /* make prefix in the canonical form */
776 for (i = 0; i < 4; i++) {
777 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
778 new->ndpr_mask.s6_addr32[i];
782 /* link ndpr_entry to nd_prefix list */
783 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry);
784 mtx_unlock(&nd6_mtx);
786 /* ND_OPT_PI_FLAG_ONLINK processing */
787 if (new->ndpr_raf_onlink) {
790 if ((e = nd6_prefix_onlink(new)) != 0) {
791 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
792 "the prefix %s/%d on-link on %s (errno=%d)\n",
793 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
794 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
795 /* proceed anyway. XXX: is it correct? */
806 prelist_remove(struct nd_prefix *pr)
808 struct nd_pfxrouter *pfr, *next;
811 /* make sure to invalidate the prefix until it is really freed. */
816 * Though these flags are now meaningless, we'd rather keep the value
817 * not to confuse users when executing "ndp -p".
819 pr->ndpr_raf_onlink = 0;
820 pr->ndpr_raf_auto = 0;
822 if ((pr->ndpr_stateflags & NDPRF_ONLINK) &&
823 (e = nd6_prefix_offlink(pr)) != 0) {
824 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
826 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
827 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
828 /* what should we do? */
831 if (pr->ndpr_refcnt > 0)
832 return; /* notice here? */
836 /* unlink ndpr_entry from nd_prefix list */
837 LIST_REMOVE(pr, ndpr_entry);
839 /* free list of routers that adversed the prefix */
840 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
841 next = pfr->pfr_next;
843 kfree(pfr, M_IP6NDP);
845 mtx_unlock(&nd6_mtx);
849 pfxlist_onlink_check();
857 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m)
859 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
860 struct ifaddr_container *ifac;
861 struct ifnet *ifp = new->ndpr_ifp;
862 struct nd_prefix *pr;
865 struct in6_addrlifetime lt6_tmp;
871 * Authenticity for NA consists authentication for
872 * both IP header and IP datagrams, doesn't it ?
874 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
875 auth = ((m->m_flags & M_AUTHIPHDR) &&
876 (m->m_flags & M_AUTHIPDGM));
880 if ((pr = nd6_prefix_lookup(new)) != NULL) {
882 * nd6_prefix_lookup() ensures that pr and new have the same
883 * prefix on a same interface.
887 * Update prefix information. Note that the on-link (L) bit
888 * and the autonomous (A) bit should NOT be changed from 1
891 if (new->ndpr_raf_onlink == 1)
892 pr->ndpr_raf_onlink = 1;
893 if (new->ndpr_raf_auto == 1)
894 pr->ndpr_raf_auto = 1;
895 if (new->ndpr_raf_onlink) {
896 pr->ndpr_vltime = new->ndpr_vltime;
897 pr->ndpr_pltime = new->ndpr_pltime;
898 pr->ndpr_preferred = new->ndpr_preferred;
899 pr->ndpr_expire = new->ndpr_expire;
902 if (new->ndpr_raf_onlink &&
903 !(pr->ndpr_stateflags & NDPRF_ONLINK)) {
906 if ((e = nd6_prefix_onlink(pr)) != 0) {
908 "prelist_update: failed to make "
909 "the prefix %s/%d on-link on %s "
911 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
912 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
913 /* proceed anyway. XXX: is it correct? */
917 if (dr && pfxrtr_lookup(pr, dr) == NULL)
920 struct nd_prefix *newpr = NULL;
922 if (new->ndpr_vltime == 0)
924 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
927 bzero(&new->ndpr_addr, sizeof(struct in6_addr));
929 error = nd6_prelist_add(new, dr, &newpr);
930 if (error != 0 || newpr == NULL) {
931 nd6log((LOG_NOTICE, "prelist_update: "
932 "nd6_prelist_add failed for %s/%d on %s "
933 "errno=%d, returnpr=%p\n",
934 ip6_sprintf(&new->ndpr_prefix.sin6_addr),
935 new->ndpr_plen, if_name(new->ndpr_ifp),
937 goto end; /* we should just give up in this case. */
941 * XXX: from the ND point of view, we can ignore a prefix
942 * with the on-link bit being zero. However, we need a
943 * prefix structure for references from autoconfigured
944 * addresses. Thus, we explicitly make sure that the prefix
945 * itself expires now.
947 if (newpr->ndpr_raf_onlink == 0) {
948 newpr->ndpr_vltime = 0;
949 newpr->ndpr_pltime = 0;
950 in6_init_prefix_ltimes(newpr);
957 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
958 * Note that pr must be non NULL at this point.
961 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
962 if (!new->ndpr_raf_auto)
966 * 5.5.3 (b). the link-local prefix should have been ignored in
971 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
972 * This should have been done in nd6_ra_input.
976 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
977 * address already in the list, and the Valid Lifetime is not 0,
978 * form an address. Note that even a manually configured address
979 * should reject autoconfiguration of a new address.
981 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
982 struct ifaddr *ifa = ifac->ifa;
983 struct in6_ifaddr *ifa6;
985 u_int32_t storedlifetime;
987 if (ifa->ifa_addr->sa_family != AF_INET6)
990 ifa6 = (struct in6_ifaddr *)ifa;
993 * Spec is not clear here, but I believe we should concentrate
994 * on unicast (i.e. not anycast) addresses.
995 * XXX: other ia6_flags? detached or duplicated?
997 if (ifa6->ia6_flags & IN6_IFF_ANYCAST)
1000 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL);
1001 if (ifa_plen != new->ndpr_plen ||
1002 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr,
1003 &new->ndpr_prefix.sin6_addr, ifa_plen))
1006 if (ia6_match == NULL) /* remember the first one */
1009 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1013 * An already autoconfigured address matched. Now that we
1014 * are sure there is at least one matched address, we can
1015 * proceed to 5.5.3. (e): update the lifetimes according to the
1016 * "two hours" rule and the privacy extension.
1018 #define TWOHOUR (120*60)
1019 lt6_tmp = ifa6->ia6_lifetime;
1021 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1022 storedlifetime = ND6_INFINITE_LIFETIME;
1023 else if (IFA6_IS_INVALID(ifa6))
1026 storedlifetime = lt6_tmp.ia6t_expire - time_uptime;
1028 /* when not updating, keep the current stored lifetime. */
1029 lt6_tmp.ia6t_vltime = storedlifetime;
1031 if (TWOHOUR < new->ndpr_vltime ||
1032 storedlifetime < new->ndpr_vltime) {
1033 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1034 } else if (storedlifetime <= TWOHOUR
1037 * This condition is logically redundant, so we just
1039 * See IPng 6712, 6717, and 6721.
1041 && new->ndpr_vltime <= storedlifetime
1045 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1049 * new->ndpr_vltime <= TWOHOUR &&
1050 * TWOHOUR < storedlifetime
1052 lt6_tmp.ia6t_vltime = TWOHOUR;
1055 /* The 2 hour rule is not imposed for preferred lifetime. */
1056 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1058 in6_init_address_ltimes(pr, <6_tmp);
1061 * When adjusting the lifetimes of an existing temporary
1062 * address, only lower the lifetimes.
1063 * RFC 3041 3.3. (1).
1064 * XXX: how should we modify ia6t_[pv]ltime?
1066 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) {
1067 if (lt6_tmp.ia6t_expire == 0 || /* no expire */
1068 lt6_tmp.ia6t_expire >
1069 ifa6->ia6_lifetime.ia6t_expire) {
1070 lt6_tmp.ia6t_expire =
1071 ifa6->ia6_lifetime.ia6t_expire;
1073 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */
1074 lt6_tmp.ia6t_preferred >
1075 ifa6->ia6_lifetime.ia6t_preferred) {
1076 lt6_tmp.ia6t_preferred =
1077 ifa6->ia6_lifetime.ia6t_preferred;
1081 ifa6->ia6_lifetime = lt6_tmp;
1083 if (ia6_match == NULL && new->ndpr_vltime) {
1085 * No address matched and the valid lifetime is non-zero.
1086 * Create a new address.
1088 if ((ia6 = in6_ifadd(new, NULL)) != NULL) {
1090 * note that we should use pr (not new) for reference.
1097 * When a new public address is created as described
1098 * in RFC2462, also create a new temporary address.
1101 * When an interface connects to a new link, a new
1102 * randomized interface identifier should be generated
1103 * immediately together with a new set of temporary
1104 * addresses. Thus, we specifiy 1 as the 2nd arg of
1107 if (ip6_use_tempaddr) {
1109 if ((e = in6_tmpifadd(ia6, 1)) != 0) {
1110 nd6log((LOG_NOTICE, "prelist_update: "
1111 "failed to create a temporary "
1112 "address, errno=%d\n",
1118 * A newly added address might affect the status
1119 * of other addresses, so we check and update it.
1120 * XXX: what if address duplication happens?
1122 pfxlist_onlink_check();
1124 /* just set an error. do not bark here. */
1125 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1132 mtx_unlock(&nd6_mtx);
1137 * A supplement function used in the on-link detection below;
1138 * detect if a given prefix has a (probably) reachable advertising router.
1139 * XXX: lengthy function name...
1141 static struct nd_pfxrouter *
1142 find_pfxlist_reachable_router(struct nd_prefix *pr)
1144 struct nd_pfxrouter *pfxrtr;
1146 struct llinfo_nd6 *ln;
1148 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr;
1149 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1150 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0,
1151 pfxrtr->router->ifp)) &&
1152 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) &&
1153 ND6_IS_LLINFO_PROBREACH(ln))
1161 * Check if each prefix in the prefix list has at least one available router
1162 * that advertised the prefix (a router is "available" if its neighbor cache
1163 * entry is reachable or probably reachable).
1164 * If the check fails, the prefix may be off-link, because, for example,
1165 * we have moved from the network but the lifetime of the prefix has not
1166 * expired yet. So we should not use the prefix if there is another prefix
1167 * that has an available router.
1168 * But, if there is no prefix that has an available router, we still regards
1169 * all the prefixes as on-link. This is because we can't tell if all the
1170 * routers are simply dead or if we really moved from the network and there
1171 * is no router around us.
1174 pfxlist_onlink_check(void)
1176 struct nd_prefix *pr;
1177 struct in6_ifaddr *ifa;
1180 * Check if there is a prefix that has a reachable advertising
1183 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1184 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1190 * There is at least one prefix that has a reachable router.
1191 * Detach prefixes which have no reachable advertising
1192 * router, and attach other prefixes.
1194 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1195 /* XXX: a link-local prefix should never be detached */
1196 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1200 * we aren't interested in prefixes without the L bit
1203 if (pr->ndpr_raf_onlink == 0)
1206 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1207 find_pfxlist_reachable_router(pr) == NULL)
1208 pr->ndpr_stateflags |= NDPRF_DETACHED;
1209 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1210 find_pfxlist_reachable_router(pr) != NULL)
1211 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1214 /* there is no prefix that has a reachable router */
1215 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1216 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1219 if (pr->ndpr_raf_onlink == 0)
1222 if (pr->ndpr_stateflags & NDPRF_DETACHED)
1223 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1228 * Remove each interface route associated with a (just) detached
1229 * prefix, and reinstall the interface route for a (just) attached
1230 * prefix. Note that all attempt of reinstallation does not
1231 * necessarily success, when a same prefix is shared among multiple
1232 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1233 * so we don't have to care about them.
1235 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1238 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1241 if (pr->ndpr_raf_onlink == 0)
1244 if ((pr->ndpr_stateflags & NDPRF_DETACHED) &&
1245 (pr->ndpr_stateflags & NDPRF_ONLINK)) {
1246 if ((e = nd6_prefix_offlink(pr)) != 0) {
1248 "pfxlist_onlink_check: failed to "
1249 "make %s/%d offlink, errno=%d\n",
1250 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1254 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) &&
1255 !(pr->ndpr_stateflags & NDPRF_ONLINK) &&
1256 pr->ndpr_raf_onlink) {
1257 if ((e = nd6_prefix_onlink(pr)) != 0) {
1259 "pfxlist_onlink_check: failed to "
1260 "make %s/%d offlink, errno=%d\n",
1261 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1268 * Changes on the prefix status might affect address status as well.
1269 * Make sure that all addresses derived from an attached prefix are
1270 * attached, and that all addresses derived from a detached prefix are
1271 * detached. Note, however, that a manually configured address should
1272 * always be attached.
1273 * The precise detection logic is same as the one for prefixes.
1275 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1276 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1279 if (ifa->ia6_ndpr == NULL) {
1281 * This can happen when we first configure the address
1282 * (i.e. the address exists, but the prefix does not).
1283 * XXX: complicated relationships...
1288 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1292 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1293 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1296 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1299 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1300 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1302 ifa->ia6_flags |= IN6_IFF_DETACHED;
1306 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) {
1307 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1310 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1316 nd6_prefix_onlink(struct nd_prefix *pr)
1319 struct ifnet *ifp = pr->ndpr_ifp;
1320 struct sockaddr_in6 mask6;
1321 struct nd_prefix *opr;
1326 if (pr->ndpr_stateflags & NDPRF_ONLINK) {
1328 "nd6_prefix_onlink: %s/%d is already on-link\n",
1329 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen);
1334 * Add the interface route associated with the prefix. Before
1335 * installing the route, check if there's the same prefix on another
1336 * interface, and the prefix has already installed the interface route.
1337 * Although such a configuration is expected to be rare, we explicitly
1340 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1344 if (!(opr->ndpr_stateflags & NDPRF_ONLINK))
1347 if (opr->ndpr_plen == pr->ndpr_plen &&
1348 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1349 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1354 * We prefer link-local addresses as the associated interface address.
1356 /* search for a link-local addr */
1357 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1358 IN6_IFF_NOTREADY| IN6_IFF_ANYCAST);
1360 struct ifaddr_container *ifac;
1362 /* XXX: freebsd does not have ifa_ifwithaf */
1363 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1364 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) {
1369 /* should we care about ia6_flags? */
1373 * This can still happen, when, for example, we receive an RA
1374 * containing a prefix with the L bit set and the A bit clear,
1375 * after removing all IPv6 addresses on the receiving
1376 * interface. This should, of course, be rare though.
1379 "nd6_prefix_onlink: failed to find any ifaddr"
1380 " to add route for a prefix(%s/%d) on %s\n",
1381 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1382 pr->ndpr_plen, if_name(ifp)));
1387 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1388 * ifa->ifa_rtrequest = nd6_rtrequest;
1390 bzero(&mask6, sizeof(mask6));
1391 mask6.sin6_len = sizeof(mask6);
1392 mask6.sin6_addr = pr->ndpr_mask;
1393 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP;
1394 if (nd6_need_cache(ifp)) {
1395 /* explicitly set in case ifa_flags does not set the flag. */
1396 rtflags |= RTF_CLONING;
1399 * explicitly clear the cloning bit in case ifa_flags sets it.
1401 rtflags &= ~RTF_CLONING;
1403 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1404 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags);
1406 pr->ndpr_stateflags |= NDPRF_ONLINK;
1408 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1409 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1411 ip6_sprintf(&pr->ndpr_prefix.sin6_addr),
1412 pr->ndpr_plen, if_name(ifp),
1413 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1414 ip6_sprintf(&mask6.sin6_addr), rtflags, error));
1420 nd6_prefix_offlink(struct nd_prefix *pr)
1423 struct ifnet *ifp = pr->ndpr_ifp;
1424 struct nd_prefix *opr;
1425 struct sockaddr_in6 sa6, mask6;
1428 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
1430 "nd6_prefix_offlink: %s/%d is already off-link\n",
1431 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen));
1435 bzero(&sa6, sizeof(sa6));
1436 sa6.sin6_family = AF_INET6;
1437 sa6.sin6_len = sizeof(sa6);
1438 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1439 sizeof(struct in6_addr));
1440 bzero(&mask6, sizeof(mask6));
1441 mask6.sin6_family = AF_INET6;
1442 mask6.sin6_len = sizeof(sa6);
1443 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1444 error = rtrequest_global(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1445 (struct sockaddr *)&mask6, 0);
1447 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1450 * There might be the same prefix on another interface,
1451 * the prefix which could not be on-link just because we have
1452 * the interface route (see comments in nd6_prefix_onlink).
1453 * If there's one, try to make the prefix on-link on the
1456 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1460 if (opr->ndpr_stateflags & NDPRF_ONLINK)
1464 * KAME specific: detached prefixes should not be
1467 if (opr->ndpr_stateflags & NDPRF_DETACHED)
1470 if (opr->ndpr_plen == pr->ndpr_plen &&
1471 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1472 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1475 if ((e = nd6_prefix_onlink(opr)) != 0) {
1477 "nd6_prefix_offlink: failed to "
1478 "recover a prefix %s/%d from %s "
1479 "to %s (errno = %d)\n",
1480 ip6_sprintf(&opr->ndpr_prefix.sin6_addr),
1481 opr->ndpr_plen, if_name(ifp),
1482 if_name(opr->ndpr_ifp), e));
1487 /* XXX: can we still set the NDPRF_ONLINK flag? */
1489 "nd6_prefix_offlink: failed to delete route: "
1490 "%s/%d on %s (errno = %d)\n",
1491 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp),
1500 * ifid: Mobile IPv6 addition
1502 static struct in6_ifaddr *
1503 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid)
1505 struct ifnet *ifp = pr->ndpr_ifp;
1507 struct in6_aliasreq ifra;
1508 struct in6_ifaddr *ia, *ib;
1510 struct in6_addr mask;
1511 int prefixlen = pr->ndpr_plen;
1513 in6_prefixlen2mask(&mask, prefixlen);
1516 * find a link-local address (will be interface ID).
1517 * Is it really mandatory? Theoretically, a global or a site-local
1518 * address can be configured without a link-local address, if we
1519 * have a unique interface identifier...
1521 * it is not mandatory to have a link-local address, we can generate
1522 * interface identifier on the fly. we do this because:
1523 * (1) it should be the easiest way to find interface identifier.
1524 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1525 * for multiple addresses on a single interface, and possible shortcut
1526 * of DAD. we omitted DAD for this reason in the past.
1527 * (3) a user can prevent autoconfiguration of global address
1528 * by removing link-local address by hand (this is partly because we
1529 * don't have other way to control the use of IPv6 on a interface.
1530 * this has been our design choice - cf. NRL's "ifconfig auto").
1531 * (4) it is easier to manage when an interface has addresses
1532 * with the same interface identifier, than to have multiple addresses
1533 * with different interface identifiers.
1535 * Mobile IPv6 addition: allow for caller to specify a wished interface
1536 * ID. This is to not break connections when moving addresses between
1539 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1541 ib = (struct in6_ifaddr *)ifa;
1545 #if 0 /* don't care link local addr state, and always do DAD */
1546 /* if link-local address is not eligible, do not autoconfigure. */
1547 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) {
1548 kprintf("in6_ifadd: link-local address not ready\n");
1553 /* prefixlen + ifidlen must be equal to 128 */
1554 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1555 if (prefixlen != plen0) {
1556 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1557 "(prefix=%d ifid=%d)\n",
1558 if_name(ifp), prefixlen, 128 - plen0));
1564 bzero(&ifra, sizeof(ifra));
1566 * in6_update_ifa() does not use ifra_name, but we accurately set it
1569 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1570 ifra.ifra_addr.sin6_family = AF_INET6;
1571 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1573 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr,
1574 sizeof(ifra.ifra_addr.sin6_addr));
1575 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1576 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1577 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1578 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1581 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid))
1582 ifid = &ib->ia_addr.sin6_addr;
1583 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1584 (ifid->s6_addr32[0] & ~mask.s6_addr32[0]);
1585 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1586 (ifid->s6_addr32[1] & ~mask.s6_addr32[1]);
1587 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1588 (ifid->s6_addr32[2] & ~mask.s6_addr32[2]);
1589 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1590 (ifid->s6_addr32[3] & ~mask.s6_addr32[3]);
1592 /* new prefix mask. */
1593 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1594 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1595 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1596 sizeof(ifra.ifra_prefixmask.sin6_addr));
1600 * XXX: in6_init_address_ltimes would override these values later.
1601 * We should reconsider this logic.
1603 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1604 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1606 /* XXX: scope zone ID? */
1608 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1610 * temporarily set the nopfx flag to avoid conflict.
1611 * XXX: we should reconsider the entire mechanism about prefix
1614 ifra.ifra_flags |= IN6_IFF_NOPFX;
1617 * keep the new address, regardless of the result of in6_update_ifa.
1618 * XXX: this address is now meaningless.
1619 * We should reconsider its role.
1621 pr->ndpr_addr = ifra.ifra_addr.sin6_addr;
1623 /* allocate ifaddr structure, link into chain, etc. */
1624 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
1626 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1627 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp),
1629 return (NULL); /* ifaddr must not have been allocated. */
1632 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1634 return (ia); /* this is always non-NULL */
1639 * ia0: corresponding public address
1642 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen)
1644 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1645 struct in6_ifaddr *newia;
1646 struct in6_aliasreq ifra;
1648 int trylimit = 3; /* XXX: adhoc value */
1649 u_int32_t randid[2];
1650 time_t vltime0, pltime0;
1652 bzero(&ifra, sizeof(ifra));
1653 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1654 ifra.ifra_addr = ia0->ia_addr;
1655 /* copy prefix mask */
1656 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1657 /* clear the old IFID */
1658 for (i = 0; i < 4; i++) {
1659 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1660 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1664 in6_get_tmpifid(ifp, (u_int8_t *)randid,
1665 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen);
1666 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1667 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1668 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1669 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1672 * If by chance the new temporary address is the same as an address
1673 * already assigned to the interface, generate a new randomized
1674 * interface identifier and repeat this step.
1677 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) {
1678 if (trylimit-- == 0) {
1679 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find "
1680 "a unique random IFID\n"));
1688 * The Valid Lifetime is the lower of the Valid Lifetime of the
1689 * public address or TEMP_VALID_LIFETIME.
1690 * The Preferred Lifetime is the lower of the Preferred Lifetime
1691 * of the public address or TEMP_PREFERRED_LIFETIME -
1694 if (ia0->ia6_lifetime.ia6t_expire != 0) {
1695 vltime0 = IFA6_IS_INVALID(ia0) ?
1696 0 : (ia0->ia6_lifetime.ia6t_expire - time_uptime);
1697 if (vltime0 > ip6_temp_valid_lifetime)
1698 vltime0 = ip6_temp_valid_lifetime;
1700 vltime0 = ip6_temp_valid_lifetime;
1701 if (ia0->ia6_lifetime.ia6t_preferred != 0) {
1702 pltime0 = IFA6_IS_DEPRECATED(ia0) ?
1703 0 : (ia0->ia6_lifetime.ia6t_preferred - time_uptime);
1704 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) {
1705 pltime0 = ip6_temp_preferred_lifetime -
1709 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor;
1710 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1711 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1714 * A temporary address is created only if this calculated Preferred
1715 * Lifetime is greater than REGEN_ADVANCE time units.
1717 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance)
1720 /* XXX: scope zone ID? */
1722 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
1724 /* allocate ifaddr structure, link into chain, etc. */
1725 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0)
1728 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1729 if (newia == NULL) { /* XXX: can it happen? */
1731 "in6_tmpifadd: ifa update succeeded, but we got "
1733 return (EINVAL); /* XXX */
1735 newia->ia6_ndpr = ia0->ia6_ndpr;
1736 newia->ia6_ndpr->ndpr_refcnt++;
1742 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
1744 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1745 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) {
1746 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime"
1747 "(%d) is greater than valid lifetime(%d)\n",
1748 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime));
1751 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
1752 ndpr->ndpr_preferred = 0;
1754 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime;
1755 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1756 ndpr->ndpr_expire = 0;
1758 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime;
1764 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
1766 /* init ia6t_expire */
1767 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
1768 lt6->ia6t_expire = 0;
1770 lt6->ia6t_expire = time_uptime;
1771 lt6->ia6t_expire += lt6->ia6t_vltime;
1774 /* init ia6t_preferred */
1775 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
1776 lt6->ia6t_preferred = 0;
1778 lt6->ia6t_preferred = time_uptime;
1779 lt6->ia6t_preferred += lt6->ia6t_pltime;
1784 * Delete all the routing table entries that use the specified gateway.
1786 * XXX: this function causes search through all entries of routing table, so
1787 * it shouldn't be called when acting as a router.
1790 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
1792 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6];
1794 /* We'll care only link-local addresses */
1795 if (!IN6_IS_ADDR_LINKLOCAL(gateway))
1797 /* XXX: hack for KAME's link-local address kludge */
1798 gateway->s6_addr16[1] = htons(ifp->if_index);
1800 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
1804 rt6_deleteroute(struct radix_node *rn, void *arg)
1806 #define SIN6(s) ((struct sockaddr_in6 *)s)
1807 struct rtentry *rt = (struct rtentry *)rn;
1808 struct in6_addr *gate = (struct in6_addr *)arg;
1810 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
1813 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr))
1817 * Do not delete a static route.
1818 * XXX: this seems to be a bit ad-hoc. Should we consider the
1819 * 'cloned' bit instead?
1821 if (rt->rt_flags & RTF_STATIC)
1825 * We delete only host route. This means, in particular, we don't
1826 * delete default route.
1828 if (!(rt->rt_flags & RTF_HOST))
1831 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt),
1837 nd6_setdefaultiface(int ifindex)
1841 if (ifindex < 0 || if_index < ifindex)
1844 if (nd6_defifindex != ifindex) {
1845 nd6_defifindex = ifindex;
1846 if (nd6_defifindex > 0)
1847 nd6_defifp = ifindex2ifnet[nd6_defifindex];
1852 * If the Default Router List is empty, install a route
1853 * to the specified interface as default or remove the default
1854 * route when the default interface becomes canceled.
1855 * The check for the queue is actually redundant, but
1856 * we do this here to avoid re-install the default route
1857 * if the list is NOT empty.
1859 if (TAILQ_FIRST(&nd_defrouter) == NULL)
1863 * Our current implementation assumes one-to-one maping between
1864 * interfaces and links, so it would be natural to use the
1865 * default interface as the default link.
1867 scope6_setdefault(nd6_defifp);