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
;
122 struct sockaddr_dl
*sdl
= NULL
;
123 struct llinfo_nd6
*ln
= NULL
;
124 struct rtentry
*rt
= NULL
;
127 union nd_opts ndopts
;
129 /* If I'm not a router, ignore it. */
130 if (ip6_accept_rtadv
!= 0 || ip6_forwarding
!= 1)
134 if (ip6
->ip6_hlim
!= 255) {
136 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
137 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
138 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
143 * Don't update the neighbor cache, if src = ::.
144 * This indicates that the src has no IP address assigned yet.
146 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
))
149 #ifndef PULLDOWN_TEST
150 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
151 nd_rs
= (struct nd_router_solicit
*)((caddr_t
)ip6
+ off
);
153 IP6_EXTHDR_GET(nd_rs
, struct nd_router_solicit
*, m
, off
, icmp6len
);
155 icmp6stat
.icp6s_tooshort
++;
160 icmp6len
-= sizeof(*nd_rs
);
161 nd6_option_init(nd_rs
+ 1, icmp6len
, &ndopts
);
162 if (nd6_options(&ndopts
) < 0) {
164 "nd6_rs_input: invalid ND option, ignored\n"));
165 /* nd6_options have incremented stats */
169 if (ndopts
.nd_opts_src_lladdr
) {
170 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
171 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
174 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
176 "nd6_rs_input: lladdrlen mismatch for %s "
177 "(if %d, RS packet %d)\n",
178 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
182 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_SOLICIT
, 0);
189 icmp6stat
.icp6s_badrs
++;
194 * Receive Router Advertisement Message.
197 * TODO: on-link bit on prefix information
198 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
201 nd6_ra_input(struct mbuf
*m
, int off
, int icmp6len
)
203 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
204 struct nd_ifinfo
*ndi
= ND_IFINFO(ifp
);
205 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
206 struct nd_router_advert
*nd_ra
;
207 struct in6_addr saddr6
= ip6
->ip6_src
;
209 struct in6_addr daddr6
= ip6
->ip6_dst
;
210 int flags
; /* = nd_ra->nd_ra_flags_reserved; */
211 int is_managed
= ((flags
& ND_RA_FLAG_MANAGED
) != 0);
212 int is_other
= ((flags
& ND_RA_FLAG_OTHER
) != 0);
214 union nd_opts ndopts
;
215 struct nd_defrouter
*dr
;
218 * We only accept RAs only when
219 * the system-wide variable allows the acceptance, and
220 * per-interface variable allows RAs on the receiving interface.
222 if (ip6_accept_rtadv
== 0)
224 if (!(ndi
->flags
& ND6_IFF_ACCEPT_RTADV
))
227 if (ip6
->ip6_hlim
!= 255) {
229 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
230 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
231 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
235 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6
)) {
237 "nd6_ra_input: src %s is not link-local\n",
238 ip6_sprintf(&saddr6
)));
242 #ifndef PULLDOWN_TEST
243 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
244 nd_ra
= (struct nd_router_advert
*)((caddr_t
)ip6
+ off
);
246 IP6_EXTHDR_GET(nd_ra
, struct nd_router_advert
*, m
, off
, icmp6len
);
248 icmp6stat
.icp6s_tooshort
++;
253 icmp6len
-= sizeof(*nd_ra
);
254 nd6_option_init(nd_ra
+ 1, icmp6len
, &ndopts
);
255 if (nd6_options(&ndopts
) < 0) {
257 "nd6_ra_input: invalid ND option, ignored\n"));
258 /* nd6_options have incremented stats */
263 struct nd_defrouter dr0
;
264 u_int32_t advreachable
= nd_ra
->nd_ra_reachable
;
267 dr0
.flags
= nd_ra
->nd_ra_flags_reserved
;
268 dr0
.rtlifetime
= ntohs(nd_ra
->nd_ra_router_lifetime
);
269 dr0
.expire
= time_uptime
+ dr0
.rtlifetime
;
271 dr0
.advint
= 0; /* Mobile IPv6 */
272 dr0
.advint_expire
= 0; /* Mobile IPv6 */
273 dr0
.advints_lost
= 0; /* Mobile IPv6 */
274 /* unspecified or not? (RFC 2461 6.3.4) */
276 advreachable
= ntohl(advreachable
);
277 if (advreachable
<= MAX_REACHABLE_TIME
&&
278 ndi
->basereachable
!= advreachable
) {
279 ndi
->basereachable
= advreachable
;
280 ndi
->reachable
= ND_COMPUTE_RTIME(ndi
->basereachable
);
281 ndi
->recalctm
= nd6_recalc_reachtm_interval
; /* reset */
284 if (nd_ra
->nd_ra_retransmit
)
285 ndi
->retrans
= ntohl(nd_ra
->nd_ra_retransmit
);
286 if (nd_ra
->nd_ra_curhoplimit
)
287 ndi
->chlim
= nd_ra
->nd_ra_curhoplimit
;
288 dr
= defrtrlist_update(&dr0
);
294 if (ndopts
.nd_opts_pi
) {
295 struct nd_opt_hdr
*pt
;
296 struct nd_opt_prefix_info
*pi
= NULL
;
299 for (pt
= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi
;
300 pt
<= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi_end
;
301 pt
= (struct nd_opt_hdr
*)((caddr_t
)pt
+
302 (pt
->nd_opt_len
<< 3))) {
303 if (pt
->nd_opt_type
!= ND_OPT_PREFIX_INFORMATION
)
305 pi
= (struct nd_opt_prefix_info
*)pt
;
307 if (pi
->nd_opt_pi_len
!= 4) {
309 "nd6_ra_input: invalid option "
310 "len %d for prefix information option, "
311 "ignored\n", pi
->nd_opt_pi_len
));
315 if (128 < pi
->nd_opt_pi_prefix_len
) {
317 "nd6_ra_input: invalid prefix "
318 "len %d for prefix information option, "
319 "ignored\n", pi
->nd_opt_pi_prefix_len
));
323 if (IN6_IS_ADDR_MULTICAST(&pi
->nd_opt_pi_prefix
)
324 || IN6_IS_ADDR_LINKLOCAL(&pi
->nd_opt_pi_prefix
)) {
326 "nd6_ra_input: invalid prefix "
328 ip6_sprintf(&pi
->nd_opt_pi_prefix
)));
332 bzero(&pr
, sizeof(pr
));
333 pr
.ndpr_prefix
.sin6_family
= AF_INET6
;
334 pr
.ndpr_prefix
.sin6_len
= sizeof(pr
.ndpr_prefix
);
335 pr
.ndpr_prefix
.sin6_addr
= pi
->nd_opt_pi_prefix
;
336 pr
.ndpr_ifp
= (struct ifnet
*)m
->m_pkthdr
.rcvif
;
338 pr
.ndpr_raf_onlink
= (pi
->nd_opt_pi_flags_reserved
&
339 ND_OPT_PI_FLAG_ONLINK
) ? 1 : 0;
340 pr
.ndpr_raf_auto
= (pi
->nd_opt_pi_flags_reserved
&
341 ND_OPT_PI_FLAG_AUTO
) ? 1 : 0;
342 pr
.ndpr_plen
= pi
->nd_opt_pi_prefix_len
;
343 pr
.ndpr_vltime
= ntohl(pi
->nd_opt_pi_valid_time
);
344 pr
.ndpr_pltime
= ntohl(pi
->nd_opt_pi_preferred_time
);
345 if (in6_init_prefix_ltimes(&pr
))
346 continue; /* prefix lifetime init failed */
347 prelist_update(&pr
, dr
, m
);
354 if (ndopts
.nd_opts_mtu
&& ndopts
.nd_opts_mtu
->nd_opt_mtu_len
== 1) {
357 mtu
= ntohl(ndopts
.nd_opts_mtu
->nd_opt_mtu_mtu
);
360 if (mtu
< IPV6_MMTU
) {
361 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu option "
362 "mtu=%ld sent from %s, ignoring\n",
363 mtu
, ip6_sprintf(&ip6
->ip6_src
)));
368 maxmtu
= (ndi
->maxmtu
&& ndi
->maxmtu
< ifp
->if_mtu
) ?
369 ndi
->maxmtu
: ifp
->if_mtu
;
371 int change
= (ndi
->linkmtu
!= mtu
);
374 if (change
) /* in6_maxmtu may change */
377 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu "
378 "mtu=%lu sent from %s; "
379 "exceeds maxmtu %lu, ignoring\n",
380 mtu
, ip6_sprintf(&ip6
->ip6_src
), maxmtu
));
387 * Source link layer address
393 if (ndopts
.nd_opts_src_lladdr
) {
394 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
395 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
398 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
400 "nd6_ra_input: lladdrlen mismatch for %s "
401 "(if %d, RA packet %d)\n",
402 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
406 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_ADVERT
, 0);
409 * Installing a link-layer address might change the state of the
410 * router's neighbor cache, which might also affect our on-link
411 * detection of adveritsed prefixes.
413 pfxlist_onlink_check();
421 icmp6stat
.icp6s_badra
++;
426 * default router list proccessing sub routines
430 /* tell the change to user processes watching the routing socket. */
432 nd6_rtmsg(int cmd
, struct rtentry
*rt
)
434 struct rt_addrinfo info
;
436 bzero((caddr_t
)&info
, sizeof(info
));
437 info
.rti_info
[RTAX_DST
] = rt_key(rt
);
438 info
.rti_info
[RTAX_GATEWAY
] = rt
->rt_gateway
;
439 info
.rti_info
[RTAX_NETMASK
] = rt_mask(rt
);
440 if (TAILQ_EMPTY(&rt
->rt_ifp
->if_addrheads
[mycpuid
])) {
441 info
.rti_info
[RTAX_IFP
] = NULL
;
443 info
.rti_info
[RTAX_IFP
] =
445 TAILQ_FIRST(&rt
->rt_ifp
->if_addrheads
[mycpuid
])->ifa
;
447 info
.rti_info
[RTAX_IFA
] = rt
->rt_ifa
->ifa_addr
;
449 rt_missmsg(cmd
, &info
, rt
->rt_flags
, 0);
454 defrouter_addreq(struct nd_defrouter
*new)
456 struct sockaddr_in6 def
, mask
, gate
;
458 bzero(&def
, sizeof(def
));
459 bzero(&mask
, sizeof(mask
));
460 bzero(&gate
, sizeof(gate
));
462 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
=
463 sizeof(struct sockaddr_in6
);
464 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
465 gate
.sin6_addr
= new->rtaddr
;
467 rtrequest_global(RTM_ADD
, (struct sockaddr
*)&def
,
468 (struct sockaddr
*)&gate
, (struct sockaddr
*)&mask
, RTF_GATEWAY
);
472 /* Add a route to a given interface as default */
474 defrouter_addifreq(struct ifnet
*ifp
)
476 struct sockaddr_in6 def
, mask
;
480 bzero(&def
, sizeof(def
));
481 bzero(&mask
, sizeof(mask
));
483 def
.sin6_len
= mask
.sin6_len
= sizeof(struct sockaddr_in6
);
484 def
.sin6_family
= mask
.sin6_family
= AF_INET6
;
487 * Search for an ifaddr beloging to the specified interface.
488 * XXX: An IPv6 address are required to be assigned on the interface.
490 if ((ifa
= ifaof_ifpforaddr((struct sockaddr
*)&def
, ifp
)) == NULL
) {
491 nd6log((LOG_ERR
, /* better error? */
492 "defrouter_addifreq: failed to find an ifaddr "
493 "to install a route to interface %s\n",
498 flags
= ifa
->ifa_flags
;
499 error
= rtrequest_global(RTM_ADD
, (struct sockaddr
*)&def
,
500 ifa
->ifa_addr
, (struct sockaddr
*)&mask
, flags
);
503 "defrouter_addifreq: failed to install a route to "
504 "interface %s (errno = %d)\n",
505 if_name(ifp
), error
));
509 struct nd_defrouter
*
510 defrouter_lookup(struct in6_addr
*addr
, struct ifnet
*ifp
)
512 struct nd_defrouter
*dr
;
514 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
515 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
516 if (dr
->ifp
== ifp
&& IN6_ARE_ADDR_EQUAL(addr
, &dr
->rtaddr
))
520 return (NULL
); /* search failed */
524 defrouter_delreq(struct nd_defrouter
*dr
, int dofree
)
526 struct sockaddr_in6 def
, mask
, gate
;
528 bzero(&def
, sizeof(def
));
529 bzero(&mask
, sizeof(mask
));
530 bzero(&gate
, sizeof(gate
));
532 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
=
533 sizeof(struct sockaddr_in6
);
534 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
535 gate
.sin6_addr
= dr
->rtaddr
;
537 rtrequest_global(RTM_DELETE
, (struct sockaddr
*)&def
,
538 (struct sockaddr
*)&gate
, (struct sockaddr
*)&mask
, RTF_GATEWAY
);
539 if (dofree
) /* XXX: necessary? */
544 defrtrlist_del(struct nd_defrouter
*dr
)
546 struct nd_defrouter
*deldr
= NULL
;
547 struct nd_prefix
*pr
;
550 * Flush all the routing table entries that use the router
553 if (!ip6_forwarding
&& ip6_accept_rtadv
) /* XXX: better condition? */
554 rt6_flush(&dr
->rtaddr
, dr
->ifp
);
556 if (dr
== TAILQ_FIRST(&nd_defrouter
))
557 deldr
= dr
; /* The router is primary. */
559 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
562 * Also delete all the pointers to the router in each prefix lists.
564 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
565 struct nd_pfxrouter
*pfxrtr
;
566 if ((pfxrtr
= pfxrtr_lookup(pr
, dr
)) != NULL
)
569 pfxlist_onlink_check();
572 * If the router is the primary one, choose a new one.
573 * Note that defrouter_select() will remove the current gateway
574 * from the routing table.
583 * Default Router Selection according to Section 6.3.6 of RFC 2461:
584 * 1) Routers that are reachable or probably reachable should be
586 * 2) When no routers on the list are known to be reachable or
587 * probably reachable, routers SHOULD be selected in a round-robin
589 * 3) If the Default Router List is empty, assume that all
590 * destinations are on-link.
593 defrouter_select(void)
595 struct nd_defrouter
*dr
, anydr
;
596 struct rtentry
*rt
= NULL
;
597 struct llinfo_nd6
*ln
= NULL
;
602 * Search for a (probably) reachable router from the list.
604 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
605 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
606 if ((rt
= nd6_lookup(&dr
->rtaddr
, 0, dr
->ifp
)) &&
607 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
608 ND6_IS_LLINFO_PROBREACH(ln
)) {
609 /* Got it, and move it to the head */
610 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
611 TAILQ_INSERT_HEAD(&nd_defrouter
, dr
, dr_entry
);
616 if ((dr
= TAILQ_FIRST(&nd_defrouter
))) {
618 * De-install the previous default gateway and install
620 * Note that if there is no reachable router in the list,
621 * the head entry will be used anyway.
622 * XXX: do we have to check the current routing table entry?
624 bzero(&anydr
, sizeof(anydr
));
625 defrouter_delreq(&anydr
, 0);
626 defrouter_addreq(dr
);
630 * The Default Router List is empty, so install the default
631 * route to an inteface.
632 * XXX: The specification does not say this mechanism should
633 * be restricted to hosts, but this would be not useful
634 * (even harmful) for routers.
636 if (!ip6_forwarding
) {
638 * De-install the current default route
641 bzero(&anydr
, sizeof(anydr
));
642 defrouter_delreq(&anydr
, 0);
645 * Install a route to the default interface
647 * XXX: we enable this for host only, because
648 * this may override a default route installed
649 * a user process (e.g. routing daemon) in a
652 defrouter_addifreq(nd6_defifp
);
654 nd6log((LOG_INFO
, "defrouter_select: "
655 "there's no default router and no default"
660 mtx_unlock(&nd6_mtx
);
664 static struct nd_defrouter
*
665 defrtrlist_update(struct nd_defrouter
*new)
667 struct nd_defrouter
*dr
, *n
;
671 if ((dr
= defrouter_lookup(&new->rtaddr
, new->ifp
)) != NULL
) {
673 if (new->rtlifetime
== 0) {
678 dr
->flags
= new->flags
; /* xxx flag check */
679 dr
->rtlifetime
= new->rtlifetime
;
680 dr
->expire
= new->expire
;
682 mtx_unlock(&nd6_mtx
);
686 /* entry does not exist */
687 if (new->rtlifetime
== 0) {
688 mtx_unlock(&nd6_mtx
);
692 n
= (struct nd_defrouter
*)kmalloc(sizeof(*n
), M_IP6NDP
,
695 mtx_unlock(&nd6_mtx
);
701 * Insert the new router at the end of the Default Router List.
702 * If there is no other router, install it anyway. Otherwise,
703 * just continue to use the current default router.
705 TAILQ_INSERT_TAIL(&nd_defrouter
, n
, dr_entry
);
706 if (TAILQ_FIRST(&nd_defrouter
) == n
)
708 mtx_unlock(&nd6_mtx
);
712 static struct nd_pfxrouter
*
713 pfxrtr_lookup(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
715 struct nd_pfxrouter
*search
;
717 for (search
= pr
->ndpr_advrtrs
.lh_first
; search
; search
= search
->pfr_next
) {
718 if (search
->router
== dr
)
726 pfxrtr_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
728 struct nd_pfxrouter
*new;
730 new = kmalloc(sizeof(*new), M_IP6NDP
, M_INTWAIT
| M_ZERO
);
733 LIST_INSERT_HEAD(&pr
->ndpr_advrtrs
, new, pfr_entry
);
735 pfxlist_onlink_check();
739 pfxrtr_del(struct nd_pfxrouter
*pfr
)
741 LIST_REMOVE(pfr
, pfr_entry
);
742 kfree(pfr
, M_IP6NDP
);
746 nd6_prefix_lookup(struct nd_prefix
*pr
)
748 struct nd_prefix
*search
;
750 for (search
= nd_prefix
.lh_first
; search
; search
= search
->ndpr_next
) {
751 if (pr
->ndpr_ifp
== search
->ndpr_ifp
&&
752 pr
->ndpr_plen
== search
->ndpr_plen
&&
753 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
754 &search
->ndpr_prefix
.sin6_addr
, pr
->ndpr_plen
))
762 nd6_prelist_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
,
763 struct nd_prefix
**newp
)
765 struct nd_prefix
*new = NULL
;
768 new = kmalloc(sizeof(*new), M_IP6NDP
, M_INTWAIT
);
774 LIST_INIT(&new->ndpr_advrtrs
);
775 in6_prefixlen2mask(&new->ndpr_mask
, new->ndpr_plen
);
776 /* make prefix in the canonical form */
777 for (i
= 0; i
< 4; i
++) {
778 new->ndpr_prefix
.sin6_addr
.s6_addr32
[i
] &=
779 new->ndpr_mask
.s6_addr32
[i
];
783 /* link ndpr_entry to nd_prefix list */
784 LIST_INSERT_HEAD(&nd_prefix
, new, ndpr_entry
);
785 mtx_unlock(&nd6_mtx
);
787 /* ND_OPT_PI_FLAG_ONLINK processing */
788 if (new->ndpr_raf_onlink
) {
791 if ((e
= nd6_prefix_onlink(new)) != 0) {
792 nd6log((LOG_ERR
, "nd6_prelist_add: failed to make "
793 "the prefix %s/%d on-link on %s (errno=%d)\n",
794 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
795 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
796 /* proceed anyway. XXX: is it correct? */
807 prelist_remove(struct nd_prefix
*pr
)
809 struct nd_pfxrouter
*pfr
, *next
;
812 /* make sure to invalidate the prefix until it is really freed. */
817 * Though these flags are now meaningless, we'd rather keep the value
818 * not to confuse users when executing "ndp -p".
820 pr
->ndpr_raf_onlink
= 0;
821 pr
->ndpr_raf_auto
= 0;
823 if ((pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
824 (e
= nd6_prefix_offlink(pr
)) != 0) {
825 nd6log((LOG_ERR
, "prelist_remove: failed to make %s/%d offlink "
827 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
828 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
829 /* what should we do? */
832 if (pr
->ndpr_refcnt
> 0)
833 return; /* notice here? */
837 /* unlink ndpr_entry from nd_prefix list */
838 LIST_REMOVE(pr
, ndpr_entry
);
840 /* free list of routers that adversed the prefix */
841 for (pfr
= pr
->ndpr_advrtrs
.lh_first
; pfr
; pfr
= next
) {
842 next
= pfr
->pfr_next
;
844 kfree(pfr
, M_IP6NDP
);
846 mtx_unlock(&nd6_mtx
);
850 pfxlist_onlink_check();
858 prelist_update(struct nd_prefix
*new, struct nd_defrouter
*dr
, struct mbuf
*m
)
860 struct in6_ifaddr
*ia6
= NULL
, *ia6_match
= NULL
;
861 struct ifaddr_container
*ifac
;
862 struct ifnet
*ifp
= new->ndpr_ifp
;
863 struct nd_prefix
*pr
;
866 struct in6_addrlifetime lt6_tmp
;
872 * Authenticity for NA consists authentication for
873 * both IP header and IP datagrams, doesn't it ?
875 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
876 auth
= ((m
->m_flags
& M_AUTHIPHDR
) &&
877 (m
->m_flags
& M_AUTHIPDGM
));
881 if ((pr
= nd6_prefix_lookup(new)) != NULL
) {
883 * nd6_prefix_lookup() ensures that pr and new have the same
884 * prefix on a same interface.
888 * Update prefix information. Note that the on-link (L) bit
889 * and the autonomous (A) bit should NOT be changed from 1
892 if (new->ndpr_raf_onlink
== 1)
893 pr
->ndpr_raf_onlink
= 1;
894 if (new->ndpr_raf_auto
== 1)
895 pr
->ndpr_raf_auto
= 1;
896 if (new->ndpr_raf_onlink
) {
897 pr
->ndpr_vltime
= new->ndpr_vltime
;
898 pr
->ndpr_pltime
= new->ndpr_pltime
;
899 pr
->ndpr_preferred
= new->ndpr_preferred
;
900 pr
->ndpr_expire
= new->ndpr_expire
;
903 if (new->ndpr_raf_onlink
&&
904 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
907 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
909 "prelist_update: failed to make "
910 "the prefix %s/%d on-link on %s "
912 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
913 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
914 /* proceed anyway. XXX: is it correct? */
918 if (dr
&& pfxrtr_lookup(pr
, dr
) == NULL
)
921 struct nd_prefix
*newpr
= NULL
;
923 if (new->ndpr_vltime
== 0)
925 if (new->ndpr_raf_onlink
== 0 && new->ndpr_raf_auto
== 0)
928 bzero(&new->ndpr_addr
, sizeof(struct in6_addr
));
930 error
= nd6_prelist_add(new, dr
, &newpr
);
931 if (error
!= 0 || newpr
== NULL
) {
932 nd6log((LOG_NOTICE
, "prelist_update: "
933 "nd6_prelist_add failed for %s/%d on %s "
934 "errno=%d, returnpr=%p\n",
935 ip6_sprintf(&new->ndpr_prefix
.sin6_addr
),
936 new->ndpr_plen
, if_name(new->ndpr_ifp
),
938 goto end
; /* we should just give up in this case. */
942 * XXX: from the ND point of view, we can ignore a prefix
943 * with the on-link bit being zero. However, we need a
944 * prefix structure for references from autoconfigured
945 * addresses. Thus, we explicitly make sure that the prefix
946 * itself expires now.
948 if (newpr
->ndpr_raf_onlink
== 0) {
949 newpr
->ndpr_vltime
= 0;
950 newpr
->ndpr_pltime
= 0;
951 in6_init_prefix_ltimes(newpr
);
958 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
959 * Note that pr must be non NULL at this point.
962 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
963 if (!new->ndpr_raf_auto
)
967 * 5.5.3 (b). the link-local prefix should have been ignored in
972 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
973 * This should have been done in nd6_ra_input.
977 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
978 * address already in the list, and the Valid Lifetime is not 0,
979 * form an address. Note that even a manually configured address
980 * should reject autoconfiguration of a new address.
982 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
983 struct ifaddr
*ifa
= ifac
->ifa
;
984 struct in6_ifaddr
*ifa6
;
986 u_int32_t storedlifetime
;
988 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
991 ifa6
= (struct in6_ifaddr
*)ifa
;
994 * Spec is not clear here, but I believe we should concentrate
995 * on unicast (i.e. not anycast) addresses.
996 * XXX: other ia6_flags? detached or duplicated?
998 if (ifa6
->ia6_flags
& IN6_IFF_ANYCAST
)
1001 ifa_plen
= in6_mask2len(&ifa6
->ia_prefixmask
.sin6_addr
, NULL
);
1002 if (ifa_plen
!= new->ndpr_plen
||
1003 !in6_are_prefix_equal(&ifa6
->ia_addr
.sin6_addr
,
1004 &new->ndpr_prefix
.sin6_addr
, ifa_plen
))
1007 if (ia6_match
== NULL
) /* remember the first one */
1010 if (!(ifa6
->ia6_flags
& IN6_IFF_AUTOCONF
))
1014 * An already autoconfigured address matched. Now that we
1015 * are sure there is at least one matched address, we can
1016 * proceed to 5.5.3. (e): update the lifetimes according to the
1017 * "two hours" rule and the privacy extension.
1019 #define TWOHOUR (120*60)
1020 lt6_tmp
= ifa6
->ia6_lifetime
;
1022 if (lt6_tmp
.ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1023 storedlifetime
= ND6_INFINITE_LIFETIME
;
1024 else if (IFA6_IS_INVALID(ifa6
))
1027 storedlifetime
= lt6_tmp
.ia6t_expire
- time_uptime
;
1029 /* when not updating, keep the current stored lifetime. */
1030 lt6_tmp
.ia6t_vltime
= storedlifetime
;
1032 if (TWOHOUR
< new->ndpr_vltime
||
1033 storedlifetime
< new->ndpr_vltime
) {
1034 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1035 } else if (storedlifetime
<= TWOHOUR
1038 * This condition is logically redundant, so we just
1040 * See IPng 6712, 6717, and 6721.
1042 && new->ndpr_vltime
<= storedlifetime
1046 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1050 * new->ndpr_vltime <= TWOHOUR &&
1051 * TWOHOUR < storedlifetime
1053 lt6_tmp
.ia6t_vltime
= TWOHOUR
;
1056 /* The 2 hour rule is not imposed for preferred lifetime. */
1057 lt6_tmp
.ia6t_pltime
= new->ndpr_pltime
;
1059 in6_init_address_ltimes(pr
, <6_tmp
);
1062 * When adjusting the lifetimes of an existing temporary
1063 * address, only lower the lifetimes.
1064 * RFC 3041 3.3. (1).
1065 * XXX: how should we modify ia6t_[pv]ltime?
1067 if (ifa6
->ia6_flags
& IN6_IFF_TEMPORARY
) {
1068 if (lt6_tmp
.ia6t_expire
== 0 || /* no expire */
1069 lt6_tmp
.ia6t_expire
>
1070 ifa6
->ia6_lifetime
.ia6t_expire
) {
1071 lt6_tmp
.ia6t_expire
=
1072 ifa6
->ia6_lifetime
.ia6t_expire
;
1074 if (lt6_tmp
.ia6t_preferred
== 0 || /* no expire */
1075 lt6_tmp
.ia6t_preferred
>
1076 ifa6
->ia6_lifetime
.ia6t_preferred
) {
1077 lt6_tmp
.ia6t_preferred
=
1078 ifa6
->ia6_lifetime
.ia6t_preferred
;
1082 ifa6
->ia6_lifetime
= lt6_tmp
;
1084 if (ia6_match
== NULL
&& new->ndpr_vltime
) {
1086 * No address matched and the valid lifetime is non-zero.
1087 * Create a new address.
1089 if ((ia6
= in6_ifadd(new, NULL
)) != NULL
) {
1091 * note that we should use pr (not new) for reference.
1098 * When a new public address is created as described
1099 * in RFC2462, also create a new temporary address.
1102 * When an interface connects to a new link, a new
1103 * randomized interface identifier should be generated
1104 * immediately together with a new set of temporary
1105 * addresses. Thus, we specifiy 1 as the 2nd arg of
1108 if (ip6_use_tempaddr
) {
1110 if ((e
= in6_tmpifadd(ia6
, 1)) != 0) {
1111 nd6log((LOG_NOTICE
, "prelist_update: "
1112 "failed to create a temporary "
1113 "address, errno=%d\n",
1119 * A newly added address might affect the status
1120 * of other addresses, so we check and update it.
1121 * XXX: what if address duplication happens?
1123 pfxlist_onlink_check();
1125 /* just set an error. do not bark here. */
1126 error
= EADDRNOTAVAIL
; /* XXX: might be unused. */
1133 mtx_unlock(&nd6_mtx
);
1138 * A supplement function used in the on-link detection below;
1139 * detect if a given prefix has a (probably) reachable advertising router.
1140 * XXX: lengthy function name...
1142 static struct nd_pfxrouter
*
1143 find_pfxlist_reachable_router(struct nd_prefix
*pr
)
1145 struct nd_pfxrouter
*pfxrtr
;
1147 struct llinfo_nd6
*ln
;
1149 for (pfxrtr
= LIST_FIRST(&pr
->ndpr_advrtrs
); pfxrtr
;
1150 pfxrtr
= LIST_NEXT(pfxrtr
, pfr_entry
)) {
1151 if ((rt
= nd6_lookup(&pfxrtr
->router
->rtaddr
, 0,
1152 pfxrtr
->router
->ifp
)) &&
1153 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
1154 ND6_IS_LLINFO_PROBREACH(ln
))
1162 * Check if each prefix in the prefix list has at least one available router
1163 * that advertised the prefix (a router is "available" if its neighbor cache
1164 * entry is reachable or probably reachable).
1165 * If the check fails, the prefix may be off-link, because, for example,
1166 * we have moved from the network but the lifetime of the prefix has not
1167 * expired yet. So we should not use the prefix if there is another prefix
1168 * that has an available router.
1169 * But, if there is no prefix that has an available router, we still regards
1170 * all the prefixes as on-link. This is because we can't tell if all the
1171 * routers are simply dead or if we really moved from the network and there
1172 * is no router around us.
1175 pfxlist_onlink_check(void)
1177 struct nd_prefix
*pr
;
1178 struct in6_ifaddr
*ifa
;
1181 * Check if there is a prefix that has a reachable advertising
1184 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1185 if (pr
->ndpr_raf_onlink
&& find_pfxlist_reachable_router(pr
))
1191 * There is at least one prefix that has a reachable router.
1192 * Detach prefixes which have no reachable advertising
1193 * router, and attach other prefixes.
1195 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1196 /* XXX: a link-local prefix should never be detached */
1197 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1201 * we aren't interested in prefixes without the L bit
1204 if (pr
->ndpr_raf_onlink
== 0)
1207 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1208 find_pfxlist_reachable_router(pr
) == NULL
)
1209 pr
->ndpr_stateflags
|= NDPRF_DETACHED
;
1210 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1211 find_pfxlist_reachable_router(pr
) != NULL
)
1212 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1215 /* there is no prefix that has a reachable router */
1216 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1217 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1220 if (pr
->ndpr_raf_onlink
== 0)
1223 if (pr
->ndpr_stateflags
& NDPRF_DETACHED
)
1224 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1229 * Remove each interface route associated with a (just) detached
1230 * prefix, and reinstall the interface route for a (just) attached
1231 * prefix. Note that all attempt of reinstallation does not
1232 * necessarily success, when a same prefix is shared among multiple
1233 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1234 * so we don't have to care about them.
1236 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1239 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1242 if (pr
->ndpr_raf_onlink
== 0)
1245 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1246 (pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1247 if ((e
= nd6_prefix_offlink(pr
)) != 0) {
1249 "pfxlist_onlink_check: failed to "
1250 "make %s/%d offlink, errno=%d\n",
1251 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1255 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1256 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
1257 pr
->ndpr_raf_onlink
) {
1258 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
1260 "pfxlist_onlink_check: failed to "
1261 "make %s/%d offlink, errno=%d\n",
1262 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1269 * Changes on the prefix status might affect address status as well.
1270 * Make sure that all addresses derived from an attached prefix are
1271 * attached, and that all addresses derived from a detached prefix are
1272 * detached. Note, however, that a manually configured address should
1273 * always be attached.
1274 * The precise detection logic is same as the one for prefixes.
1276 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1277 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1280 if (ifa
->ia6_ndpr
== NULL
) {
1282 * This can happen when we first configure the address
1283 * (i.e. the address exists, but the prefix does not).
1284 * XXX: complicated relationships...
1289 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1293 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1294 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1297 if (ifa
->ia6_ndpr
== NULL
) /* XXX: see above. */
1300 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1301 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1303 ifa
->ia6_flags
|= IN6_IFF_DETACHED
;
1307 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1308 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1311 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1317 nd6_prefix_onlink(struct nd_prefix
*pr
)
1320 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1321 struct sockaddr_in6 mask6
;
1322 struct nd_prefix
*opr
;
1327 if (pr
->ndpr_stateflags
& NDPRF_ONLINK
) {
1329 "nd6_prefix_onlink: %s/%d is already on-link\n",
1330 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
);
1335 * Add the interface route associated with the prefix. Before
1336 * installing the route, check if there's the same prefix on another
1337 * interface, and the prefix has already installed the interface route.
1338 * Although such a configuration is expected to be rare, we explicitly
1341 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1345 if (!(opr
->ndpr_stateflags
& NDPRF_ONLINK
))
1348 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1349 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1350 &opr
->ndpr_prefix
.sin6_addr
, pr
->ndpr_plen
))
1355 * We prefer link-local addresses as the associated interface address.
1357 /* search for a link-local addr */
1358 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
,
1359 IN6_IFF_NOTREADY
| IN6_IFF_ANYCAST
);
1361 struct ifaddr_container
*ifac
;
1363 /* XXX: freebsd does not have ifa_ifwithaf */
1364 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
1365 if (ifac
->ifa
->ifa_addr
->sa_family
== AF_INET6
) {
1370 /* should we care about ia6_flags? */
1374 * This can still happen, when, for example, we receive an RA
1375 * containing a prefix with the L bit set and the A bit clear,
1376 * after removing all IPv6 addresses on the receiving
1377 * interface. This should, of course, be rare though.
1380 "nd6_prefix_onlink: failed to find any ifaddr"
1381 " to add route for a prefix(%s/%d) on %s\n",
1382 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1383 pr
->ndpr_plen
, if_name(ifp
)));
1388 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1389 * ifa->ifa_rtrequest = nd6_rtrequest;
1391 bzero(&mask6
, sizeof(mask6
));
1392 mask6
.sin6_len
= sizeof(mask6
);
1393 mask6
.sin6_addr
= pr
->ndpr_mask
;
1394 rtflags
= ifa
->ifa_flags
| RTF_CLONING
| RTF_UP
;
1395 if (nd6_need_cache(ifp
)) {
1396 /* explicitly set in case ifa_flags does not set the flag. */
1397 rtflags
|= RTF_CLONING
;
1400 * explicitly clear the cloning bit in case ifa_flags sets it.
1402 rtflags
&= ~RTF_CLONING
;
1404 error
= rtrequest_global(RTM_ADD
, (struct sockaddr
*)&pr
->ndpr_prefix
,
1405 ifa
->ifa_addr
, (struct sockaddr
*)&mask6
, rtflags
);
1407 pr
->ndpr_stateflags
|= NDPRF_ONLINK
;
1409 nd6log((LOG_ERR
, "nd6_prefix_onlink: failed to add route for a"
1410 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1412 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1413 pr
->ndpr_plen
, if_name(ifp
),
1414 ip6_sprintf(&((struct sockaddr_in6
*)ifa
->ifa_addr
)->sin6_addr
),
1415 ip6_sprintf(&mask6
.sin6_addr
), rtflags
, error
));
1421 nd6_prefix_offlink(struct nd_prefix
*pr
)
1424 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1425 struct nd_prefix
*opr
;
1426 struct sockaddr_in6 sa6
, mask6
;
1429 if (!(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1431 "nd6_prefix_offlink: %s/%d is already off-link\n",
1432 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
));
1436 bzero(&sa6
, sizeof(sa6
));
1437 sa6
.sin6_family
= AF_INET6
;
1438 sa6
.sin6_len
= sizeof(sa6
);
1439 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &sa6
.sin6_addr
,
1440 sizeof(struct in6_addr
));
1441 bzero(&mask6
, sizeof(mask6
));
1442 mask6
.sin6_family
= AF_INET6
;
1443 mask6
.sin6_len
= sizeof(sa6
);
1444 bcopy(&pr
->ndpr_mask
, &mask6
.sin6_addr
, sizeof(struct in6_addr
));
1445 error
= rtrequest_global(RTM_DELETE
, (struct sockaddr
*)&sa6
, NULL
,
1446 (struct sockaddr
*)&mask6
, 0);
1448 pr
->ndpr_stateflags
&= ~NDPRF_ONLINK
;
1451 * There might be the same prefix on another interface,
1452 * the prefix which could not be on-link just because we have
1453 * the interface route (see comments in nd6_prefix_onlink).
1454 * If there's one, try to make the prefix on-link on the
1457 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1461 if (opr
->ndpr_stateflags
& NDPRF_ONLINK
)
1465 * KAME specific: detached prefixes should not be
1468 if (opr
->ndpr_stateflags
& NDPRF_DETACHED
)
1471 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1472 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1473 &opr
->ndpr_prefix
.sin6_addr
, pr
->ndpr_plen
)) {
1476 if ((e
= nd6_prefix_onlink(opr
)) != 0) {
1478 "nd6_prefix_offlink: failed to "
1479 "recover a prefix %s/%d from %s "
1480 "to %s (errno = %d)\n",
1481 ip6_sprintf(&opr
->ndpr_prefix
.sin6_addr
),
1482 opr
->ndpr_plen
, if_name(ifp
),
1483 if_name(opr
->ndpr_ifp
), e
));
1488 /* XXX: can we still set the NDPRF_ONLINK flag? */
1490 "nd6_prefix_offlink: failed to delete route: "
1491 "%s/%d on %s (errno = %d)\n",
1492 ip6_sprintf(&sa6
.sin6_addr
), pr
->ndpr_plen
, if_name(ifp
),
1501 * ifid: Mobile IPv6 addition
1503 static struct in6_ifaddr
*
1504 in6_ifadd(struct nd_prefix
*pr
, struct in6_addr
*ifid
)
1506 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1508 struct in6_aliasreq ifra
;
1509 struct in6_ifaddr
*ia
, *ib
;
1511 struct in6_addr mask
;
1512 int prefixlen
= pr
->ndpr_plen
;
1514 in6_prefixlen2mask(&mask
, prefixlen
);
1517 * find a link-local address (will be interface ID).
1518 * Is it really mandatory? Theoretically, a global or a site-local
1519 * address can be configured without a link-local address, if we
1520 * have a unique interface identifier...
1522 * it is not mandatory to have a link-local address, we can generate
1523 * interface identifier on the fly. we do this because:
1524 * (1) it should be the easiest way to find interface identifier.
1525 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1526 * for multiple addresses on a single interface, and possible shortcut
1527 * of DAD. we omitted DAD for this reason in the past.
1528 * (3) a user can prevent autoconfiguration of global address
1529 * by removing link-local address by hand (this is partly because we
1530 * don't have other way to control the use of IPv6 on a interface.
1531 * this has been our design choice - cf. NRL's "ifconfig auto").
1532 * (4) it is easier to manage when an interface has addresses
1533 * with the same interface identifier, than to have multiple addresses
1534 * with different interface identifiers.
1536 * Mobile IPv6 addition: allow for caller to specify a wished interface
1537 * ID. This is to not break connections when moving addresses between
1540 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
, 0); /* 0 is OK? */
1542 ib
= (struct in6_ifaddr
*)ifa
;
1546 #if 0 /* don't care link local addr state, and always do DAD */
1547 /* if link-local address is not eligible, do not autoconfigure. */
1548 if (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_NOTREADY
) {
1549 kprintf("in6_ifadd: link-local address not ready\n");
1554 /* prefixlen + ifidlen must be equal to 128 */
1555 plen0
= in6_mask2len(&ib
->ia_prefixmask
.sin6_addr
, NULL
);
1556 if (prefixlen
!= plen0
) {
1557 nd6log((LOG_INFO
, "in6_ifadd: wrong prefixlen for %s "
1558 "(prefix=%d ifid=%d)\n",
1559 if_name(ifp
), prefixlen
, 128 - plen0
));
1565 bzero(&ifra
, sizeof(ifra
));
1567 * in6_update_ifa() does not use ifra_name, but we accurately set it
1570 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1571 ifra
.ifra_addr
.sin6_family
= AF_INET6
;
1572 ifra
.ifra_addr
.sin6_len
= sizeof(struct sockaddr_in6
);
1574 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &ifra
.ifra_addr
.sin6_addr
,
1575 sizeof(ifra
.ifra_addr
.sin6_addr
));
1576 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0] &= mask
.s6_addr32
[0];
1577 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1] &= mask
.s6_addr32
[1];
1578 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] &= mask
.s6_addr32
[2];
1579 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] &= mask
.s6_addr32
[3];
1582 if (ifid
== NULL
|| IN6_IS_ADDR_UNSPECIFIED(ifid
))
1583 ifid
= &ib
->ia_addr
.sin6_addr
;
1584 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0] |=
1585 (ifid
->s6_addr32
[0] & ~mask
.s6_addr32
[0]);
1586 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1] |=
1587 (ifid
->s6_addr32
[1] & ~mask
.s6_addr32
[1]);
1588 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] |=
1589 (ifid
->s6_addr32
[2] & ~mask
.s6_addr32
[2]);
1590 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] |=
1591 (ifid
->s6_addr32
[3] & ~mask
.s6_addr32
[3]);
1593 /* new prefix mask. */
1594 ifra
.ifra_prefixmask
.sin6_len
= sizeof(struct sockaddr_in6
);
1595 ifra
.ifra_prefixmask
.sin6_family
= AF_INET6
;
1596 bcopy(&mask
, &ifra
.ifra_prefixmask
.sin6_addr
,
1597 sizeof(ifra
.ifra_prefixmask
.sin6_addr
));
1601 * XXX: in6_init_address_ltimes would override these values later.
1602 * We should reconsider this logic.
1604 ifra
.ifra_lifetime
.ia6t_vltime
= pr
->ndpr_vltime
;
1605 ifra
.ifra_lifetime
.ia6t_pltime
= pr
->ndpr_pltime
;
1607 /* XXX: scope zone ID? */
1609 ifra
.ifra_flags
|= IN6_IFF_AUTOCONF
; /* obey autoconf */
1611 * temporarily set the nopfx flag to avoid conflict.
1612 * XXX: we should reconsider the entire mechanism about prefix
1615 ifra
.ifra_flags
|= IN6_IFF_NOPFX
;
1618 * keep the new address, regardless of the result of in6_update_ifa.
1619 * XXX: this address is now meaningless.
1620 * We should reconsider its role.
1622 pr
->ndpr_addr
= ifra
.ifra_addr
.sin6_addr
;
1624 /* allocate ifaddr structure, link into chain, etc. */
1625 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0) {
1627 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1628 ip6_sprintf(&ifra
.ifra_addr
.sin6_addr
), if_name(ifp
),
1630 return (NULL
); /* ifaddr must not have been allocated. */
1633 ia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1635 return (ia
); /* this is always non-NULL */
1640 * ia0: corresponding public address
1643 in6_tmpifadd(const struct in6_ifaddr
*ia0
, int forcegen
)
1645 struct ifnet
*ifp
= ia0
->ia_ifa
.ifa_ifp
;
1646 struct in6_ifaddr
*newia
;
1647 struct in6_aliasreq ifra
;
1649 int trylimit
= 3; /* XXX: adhoc value */
1650 u_int32_t randid
[2];
1651 time_t vltime0
, pltime0
;
1653 bzero(&ifra
, sizeof(ifra
));
1654 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1655 ifra
.ifra_addr
= ia0
->ia_addr
;
1656 /* copy prefix mask */
1657 ifra
.ifra_prefixmask
= ia0
->ia_prefixmask
;
1658 /* clear the old IFID */
1659 for (i
= 0; i
< 4; i
++) {
1660 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[i
] &=
1661 ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[i
];
1665 in6_get_tmpifid(ifp
, (u_int8_t
*)randid
,
1666 (const u_int8_t
*)&ia0
->ia_addr
.sin6_addr
.s6_addr
[8], forcegen
);
1667 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] |=
1668 (randid
[0] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[2]));
1669 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] |=
1670 (randid
[1] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[3]));
1673 * If by chance the new temporary address is the same as an address
1674 * already assigned to the interface, generate a new randomized
1675 * interface identifier and repeat this step.
1678 if (in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
) != NULL
) {
1679 if (trylimit
-- == 0) {
1680 nd6log((LOG_NOTICE
, "in6_tmpifadd: failed to find "
1681 "a unique random IFID\n"));
1689 * The Valid Lifetime is the lower of the Valid Lifetime of the
1690 * public address or TEMP_VALID_LIFETIME.
1691 * The Preferred Lifetime is the lower of the Preferred Lifetime
1692 * of the public address or TEMP_PREFERRED_LIFETIME -
1695 if (ia0
->ia6_lifetime
.ia6t_expire
!= 0) {
1696 vltime0
= IFA6_IS_INVALID(ia0
) ?
1697 0 : (ia0
->ia6_lifetime
.ia6t_expire
- time_uptime
);
1698 if (vltime0
> ip6_temp_valid_lifetime
)
1699 vltime0
= ip6_temp_valid_lifetime
;
1701 vltime0
= ip6_temp_valid_lifetime
;
1702 if (ia0
->ia6_lifetime
.ia6t_preferred
!= 0) {
1703 pltime0
= IFA6_IS_DEPRECATED(ia0
) ?
1704 0 : (ia0
->ia6_lifetime
.ia6t_preferred
- time_uptime
);
1705 if (pltime0
> ip6_temp_preferred_lifetime
- ip6_desync_factor
) {
1706 pltime0
= ip6_temp_preferred_lifetime
-
1710 pltime0
= ip6_temp_preferred_lifetime
- ip6_desync_factor
;
1711 ifra
.ifra_lifetime
.ia6t_vltime
= vltime0
;
1712 ifra
.ifra_lifetime
.ia6t_pltime
= pltime0
;
1715 * A temporary address is created only if this calculated Preferred
1716 * Lifetime is greater than REGEN_ADVANCE time units.
1718 if (ifra
.ifra_lifetime
.ia6t_pltime
<= ip6_temp_regen_advance
)
1721 /* XXX: scope zone ID? */
1723 ifra
.ifra_flags
|= (IN6_IFF_AUTOCONF
|IN6_IFF_TEMPORARY
);
1725 /* allocate ifaddr structure, link into chain, etc. */
1726 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0)
1729 newia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1730 if (newia
== NULL
) { /* XXX: can it happen? */
1732 "in6_tmpifadd: ifa update succeeded, but we got "
1734 return (EINVAL
); /* XXX */
1736 newia
->ia6_ndpr
= ia0
->ia6_ndpr
;
1737 newia
->ia6_ndpr
->ndpr_refcnt
++;
1743 in6_init_prefix_ltimes(struct nd_prefix
*ndpr
)
1745 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1746 if (ndpr
->ndpr_pltime
> ndpr
->ndpr_vltime
) {
1747 nd6log((LOG_INFO
, "in6_init_prefix_ltimes: preferred lifetime"
1748 "(%d) is greater than valid lifetime(%d)\n",
1749 (u_int
)ndpr
->ndpr_pltime
, (u_int
)ndpr
->ndpr_vltime
));
1752 if (ndpr
->ndpr_pltime
== ND6_INFINITE_LIFETIME
)
1753 ndpr
->ndpr_preferred
= 0;
1755 ndpr
->ndpr_preferred
= time_uptime
+ ndpr
->ndpr_pltime
;
1756 if (ndpr
->ndpr_vltime
== ND6_INFINITE_LIFETIME
)
1757 ndpr
->ndpr_expire
= 0;
1759 ndpr
->ndpr_expire
= time_uptime
+ ndpr
->ndpr_vltime
;
1765 in6_init_address_ltimes(struct nd_prefix
*new, struct in6_addrlifetime
*lt6
)
1767 /* init ia6t_expire */
1768 if (lt6
->ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1769 lt6
->ia6t_expire
= 0;
1771 lt6
->ia6t_expire
= time_uptime
;
1772 lt6
->ia6t_expire
+= lt6
->ia6t_vltime
;
1775 /* init ia6t_preferred */
1776 if (lt6
->ia6t_pltime
== ND6_INFINITE_LIFETIME
)
1777 lt6
->ia6t_preferred
= 0;
1779 lt6
->ia6t_preferred
= time_uptime
;
1780 lt6
->ia6t_preferred
+= lt6
->ia6t_pltime
;
1785 * Delete all the routing table entries that use the specified gateway.
1787 * XXX: this function causes search through all entries of routing table, so
1788 * it shouldn't be called when acting as a router.
1791 rt6_flush(struct in6_addr
*gateway
, struct ifnet
*ifp
)
1793 struct radix_node_head
*rnh
= rt_tables
[mycpuid
][AF_INET6
];
1795 /* We'll care only link-local addresses */
1796 if (!IN6_IS_ADDR_LINKLOCAL(gateway
))
1798 /* XXX: hack for KAME's link-local address kludge */
1799 gateway
->s6_addr16
[1] = htons(ifp
->if_index
);
1801 rnh
->rnh_walktree(rnh
, rt6_deleteroute
, (void *)gateway
);
1805 rt6_deleteroute(struct radix_node
*rn
, void *arg
)
1807 #define SIN6(s) ((struct sockaddr_in6 *)s)
1808 struct rtentry
*rt
= (struct rtentry
*)rn
;
1809 struct in6_addr
*gate
= (struct in6_addr
*)arg
;
1811 if (rt
->rt_gateway
== NULL
|| rt
->rt_gateway
->sa_family
!= AF_INET6
)
1814 if (!IN6_ARE_ADDR_EQUAL(gate
, &SIN6(rt
->rt_gateway
)->sin6_addr
))
1818 * Do not delete a static route.
1819 * XXX: this seems to be a bit ad-hoc. Should we consider the
1820 * 'cloned' bit instead?
1822 if (rt
->rt_flags
& RTF_STATIC
)
1826 * We delete only host route. This means, in particular, we don't
1827 * delete default route.
1829 if (!(rt
->rt_flags
& RTF_HOST
))
1832 return (rtrequest(RTM_DELETE
, rt_key(rt
), rt
->rt_gateway
, rt_mask(rt
),
1838 nd6_setdefaultiface(int ifindex
)
1842 if (ifindex
< 0 || if_index
< ifindex
)
1845 if (nd6_defifindex
!= ifindex
) {
1846 nd6_defifindex
= ifindex
;
1847 if (nd6_defifindex
> 0)
1848 nd6_defifp
= ifindex2ifnet
[nd6_defifindex
];
1853 * If the Default Router List is empty, install a route
1854 * to the specified interface as default or remove the default
1855 * route when the default interface becomes canceled.
1856 * The check for the queue is actually redundant, but
1857 * we do this here to avoid re-install the default route
1858 * if the list is NOT empty.
1860 if (TAILQ_FIRST(&nd_defrouter
) == NULL
)
1864 * Our current implementation assumes one-to-one maping between
1865 * interfaces and links, so it would be natural to use the
1866 * default interface as the default link.
1868 scope6_setdefault(nd6_defifp
);