1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/malloc.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
43 #include <sys/kernel.h>
44 #include <sys/errno.h>
45 #include <sys/syslog.h>
46 #include <sys/queue.h>
47 #include <sys/globaldata.h>
48 #include <sys/mutex.h>
50 #include <sys/thread2.h>
51 #include <sys/mutex2.h>
54 #include <net/if_types.h>
55 #include <net/if_dl.h>
56 #include <net/route.h>
57 #include <net/radix.h>
59 #include <netinet/in.h>
60 #include <netinet6/in6_var.h>
61 #include <netinet6/in6_ifattach.h>
62 #include <netinet/ip6.h>
63 #include <netinet6/ip6_var.h>
64 #include <netinet6/nd6.h>
65 #include <netinet/icmp6.h>
66 #include <netinet6/scope6_var.h>
68 #include <net/net_osdep.h>
70 #define SDL(s) ((struct sockaddr_dl *)s)
72 static struct nd_defrouter
*defrtrlist_update (struct nd_defrouter
*);
73 static struct in6_ifaddr
*in6_ifadd (struct nd_prefix
*,
75 static struct nd_pfxrouter
*pfxrtr_lookup (struct nd_prefix
*,
76 struct nd_defrouter
*);
77 static void pfxrtr_add (struct nd_prefix
*, struct nd_defrouter
*);
78 static void pfxrtr_del (struct nd_pfxrouter
*);
79 static struct nd_pfxrouter
*find_pfxlist_reachable_router
81 static void defrouter_addifreq (struct ifnet
*);
83 static void in6_init_address_ltimes (struct nd_prefix
*ndpr
,
84 struct in6_addrlifetime
*lt6
);
86 static int rt6_deleteroute (struct radix_node
*, void *);
88 extern int nd6_recalc_reachtm_interval
;
90 static struct ifnet
*nd6_defifp
;
93 int ip6_use_tempaddr
= 0;
95 int ip6_desync_factor
;
96 u_int32_t ip6_temp_preferred_lifetime
= DEF_TEMP_PREFERRED_LIFETIME
;
97 u_int32_t ip6_temp_valid_lifetime
= DEF_TEMP_VALID_LIFETIME
;
99 * shorter lifetimes for debugging purposes.
100 int ip6_temp_preferred_lifetime = 800;
101 static int ip6_temp_valid_lifetime = 1800;
103 int ip6_temp_regen_advance
= TEMPADDR_REGEN_ADVANCE
;
106 * Receive Router Solicitation Message - just for routers.
107 * Router solicitation/advertisement is mostly managed by userland program
108 * (rtadvd) so here we have no function like nd6_ra_output().
113 nd6_rs_input(struct mbuf
*m
, int off
, int icmp6len
)
115 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
116 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
117 struct nd_router_solicit
*nd_rs
;
118 struct in6_addr saddr6
= ip6
->ip6_src
;
120 struct in6_addr daddr6
= ip6
->ip6_dst
;
125 struct sockaddr_dl
*sdl
= NULL
;
126 struct llinfo_nd6
*ln
= NULL
;
127 struct rtentry
*rt
= NULL
;
130 union nd_opts ndopts
;
132 /* If I'm not a router, ignore it. */
133 if (ip6_accept_rtadv
!= 0 || ip6_forwarding
!= 1)
137 if (ip6
->ip6_hlim
!= 255) {
139 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
140 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
141 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
146 * Don't update the neighbor cache, if src = ::.
147 * This indicates that the src has no IP address assigned yet.
149 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
))
152 #ifndef PULLDOWN_TEST
153 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
154 nd_rs
= (struct nd_router_solicit
*)((caddr_t
)ip6
+ off
);
156 IP6_EXTHDR_GET(nd_rs
, struct nd_router_solicit
*, m
, off
, icmp6len
);
158 icmp6stat
.icp6s_tooshort
++;
163 icmp6len
-= sizeof(*nd_rs
);
164 nd6_option_init(nd_rs
+ 1, icmp6len
, &ndopts
);
165 if (nd6_options(&ndopts
) < 0) {
167 "nd6_rs_input: invalid ND option, ignored\n"));
168 /* nd6_options have incremented stats */
172 if (ndopts
.nd_opts_src_lladdr
) {
173 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
174 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
177 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
179 "nd6_rs_input: lladdrlen mismatch for %s "
180 "(if %d, RS packet %d)\n",
181 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
185 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_SOLICIT
, 0);
192 icmp6stat
.icp6s_badrs
++;
197 * Receive Router Advertisement Message.
200 * TODO: on-link bit on prefix information
201 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
204 nd6_ra_input(struct mbuf
*m
, int off
, int icmp6len
)
206 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
207 struct nd_ifinfo
*ndi
= ND_IFINFO(ifp
);
208 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
209 struct nd_router_advert
*nd_ra
;
210 struct in6_addr saddr6
= ip6
->ip6_src
;
212 struct in6_addr daddr6
= ip6
->ip6_dst
;
213 int flags
; /* = nd_ra->nd_ra_flags_reserved; */
214 int is_managed
= ((flags
& ND_RA_FLAG_MANAGED
) != 0);
215 int is_other
= ((flags
& ND_RA_FLAG_OTHER
) != 0);
217 union nd_opts ndopts
;
218 struct nd_defrouter
*dr
;
221 * We only accept RAs only when
222 * the system-wide variable allows the acceptance, and
223 * per-interface variable allows RAs on the receiving interface.
225 if (ip6_accept_rtadv
== 0)
227 if (!(ndi
->flags
& ND6_IFF_ACCEPT_RTADV
))
230 if (ip6
->ip6_hlim
!= 255) {
232 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
233 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
234 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
238 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6
)) {
240 "nd6_ra_input: src %s is not link-local\n",
241 ip6_sprintf(&saddr6
)));
245 #ifndef PULLDOWN_TEST
246 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
247 nd_ra
= (struct nd_router_advert
*)((caddr_t
)ip6
+ off
);
249 IP6_EXTHDR_GET(nd_ra
, struct nd_router_advert
*, m
, off
, icmp6len
);
251 icmp6stat
.icp6s_tooshort
++;
256 icmp6len
-= sizeof(*nd_ra
);
257 nd6_option_init(nd_ra
+ 1, icmp6len
, &ndopts
);
258 if (nd6_options(&ndopts
) < 0) {
260 "nd6_ra_input: invalid ND option, ignored\n"));
261 /* nd6_options have incremented stats */
266 struct nd_defrouter dr0
;
267 u_int32_t advreachable
= nd_ra
->nd_ra_reachable
;
270 dr0
.flags
= nd_ra
->nd_ra_flags_reserved
;
271 dr0
.rtlifetime
= ntohs(nd_ra
->nd_ra_router_lifetime
);
272 dr0
.expire
= time_uptime
+ dr0
.rtlifetime
;
274 dr0
.advint
= 0; /* Mobile IPv6 */
275 dr0
.advint_expire
= 0; /* Mobile IPv6 */
276 dr0
.advints_lost
= 0; /* Mobile IPv6 */
277 /* unspecified or not? (RFC 2461 6.3.4) */
279 advreachable
= ntohl(advreachable
);
280 if (advreachable
<= MAX_REACHABLE_TIME
&&
281 ndi
->basereachable
!= advreachable
) {
282 ndi
->basereachable
= advreachable
;
283 ndi
->reachable
= ND_COMPUTE_RTIME(ndi
->basereachable
);
284 ndi
->recalctm
= nd6_recalc_reachtm_interval
; /* reset */
287 if (nd_ra
->nd_ra_retransmit
)
288 ndi
->retrans
= ntohl(nd_ra
->nd_ra_retransmit
);
289 if (nd_ra
->nd_ra_curhoplimit
)
290 ndi
->chlim
= nd_ra
->nd_ra_curhoplimit
;
291 dr
= defrtrlist_update(&dr0
);
297 if (ndopts
.nd_opts_pi
) {
298 struct nd_opt_hdr
*pt
;
299 struct nd_opt_prefix_info
*pi
= NULL
;
302 for (pt
= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi
;
303 pt
<= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi_end
;
304 pt
= (struct nd_opt_hdr
*)((caddr_t
)pt
+
305 (pt
->nd_opt_len
<< 3))) {
306 if (pt
->nd_opt_type
!= ND_OPT_PREFIX_INFORMATION
)
308 pi
= (struct nd_opt_prefix_info
*)pt
;
310 if (pi
->nd_opt_pi_len
!= 4) {
312 "nd6_ra_input: invalid option "
313 "len %d for prefix information option, "
314 "ignored\n", pi
->nd_opt_pi_len
));
318 if (128 < pi
->nd_opt_pi_prefix_len
) {
320 "nd6_ra_input: invalid prefix "
321 "len %d for prefix information option, "
322 "ignored\n", pi
->nd_opt_pi_prefix_len
));
326 if (IN6_IS_ADDR_MULTICAST(&pi
->nd_opt_pi_prefix
)
327 || IN6_IS_ADDR_LINKLOCAL(&pi
->nd_opt_pi_prefix
)) {
329 "nd6_ra_input: invalid prefix "
331 ip6_sprintf(&pi
->nd_opt_pi_prefix
)));
335 bzero(&pr
, sizeof(pr
));
336 pr
.ndpr_prefix
.sin6_family
= AF_INET6
;
337 pr
.ndpr_prefix
.sin6_len
= sizeof(pr
.ndpr_prefix
);
338 pr
.ndpr_prefix
.sin6_addr
= pi
->nd_opt_pi_prefix
;
339 pr
.ndpr_ifp
= (struct ifnet
*)m
->m_pkthdr
.rcvif
;
341 pr
.ndpr_raf_onlink
= (pi
->nd_opt_pi_flags_reserved
&
342 ND_OPT_PI_FLAG_ONLINK
) ? 1 : 0;
343 pr
.ndpr_raf_auto
= (pi
->nd_opt_pi_flags_reserved
&
344 ND_OPT_PI_FLAG_AUTO
) ? 1 : 0;
345 pr
.ndpr_plen
= pi
->nd_opt_pi_prefix_len
;
346 pr
.ndpr_vltime
= ntohl(pi
->nd_opt_pi_valid_time
);
348 ntohl(pi
->nd_opt_pi_preferred_time
);
350 if (in6_init_prefix_ltimes(&pr
))
351 continue; /* prefix lifetime init failed */
353 prelist_update(&pr
, dr
, m
);
360 if (ndopts
.nd_opts_mtu
&& ndopts
.nd_opts_mtu
->nd_opt_mtu_len
== 1) {
361 u_int32_t mtu
= ntohl(ndopts
.nd_opts_mtu
->nd_opt_mtu_mtu
);
364 if (mtu
< IPV6_MMTU
) {
365 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu option "
366 "mtu=%d sent from %s, ignoring\n",
367 mtu
, ip6_sprintf(&ip6
->ip6_src
)));
373 if (mtu
<= ndi
->maxmtu
) {
374 int change
= (ndi
->linkmtu
!= mtu
);
377 if (change
) /* in6_maxmtu may change */
380 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu "
381 "mtu=%d sent from %s; "
382 "exceeds maxmtu %d, ignoring\n",
383 mtu
, ip6_sprintf(&ip6
->ip6_src
),
387 nd6log((LOG_INFO
, "nd6_ra_input: mtu option "
388 "mtu=%d sent from %s; maxmtu unknown, "
390 mtu
, ip6_sprintf(&ip6
->ip6_src
)));
397 * Source link layer address
403 if (ndopts
.nd_opts_src_lladdr
) {
404 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
405 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
408 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
410 "nd6_ra_input: lladdrlen mismatch for %s "
411 "(if %d, RA packet %d)\n",
412 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
416 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_ADVERT
, 0);
419 * Installing a link-layer address might change the state of the
420 * router's neighbor cache, which might also affect our on-link
421 * detection of adveritsed prefixes.
423 pfxlist_onlink_check();
431 icmp6stat
.icp6s_badra
++;
436 * default router list proccessing sub routines
440 /* tell the change to user processes watching the routing socket. */
442 nd6_rtmsg(int cmd
, struct rtentry
*rt
)
444 struct rt_addrinfo info
;
446 bzero((caddr_t
)&info
, sizeof(info
));
447 info
.rti_info
[RTAX_DST
] = rt_key(rt
);
448 info
.rti_info
[RTAX_GATEWAY
] = rt
->rt_gateway
;
449 info
.rti_info
[RTAX_NETMASK
] = rt_mask(rt
);
450 if (TAILQ_EMPTY(&rt
->rt_ifp
->if_addrheads
[mycpuid
])) {
451 info
.rti_info
[RTAX_IFP
] = NULL
;
453 info
.rti_info
[RTAX_IFP
] =
455 TAILQ_FIRST(&rt
->rt_ifp
->if_addrheads
[mycpuid
])->ifa
;
457 info
.rti_info
[RTAX_IFA
] = rt
->rt_ifa
->ifa_addr
;
459 rt_missmsg(cmd
, &info
, rt
->rt_flags
, 0);
464 defrouter_addreq(struct nd_defrouter
*new)
466 struct sockaddr_in6 def
, mask
, gate
;
468 bzero(&def
, sizeof(def
));
469 bzero(&mask
, sizeof(mask
));
470 bzero(&gate
, sizeof(gate
));
472 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
473 = sizeof(struct sockaddr_in6
);
474 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
475 gate
.sin6_addr
= new->rtaddr
;
477 rtrequest_global(RTM_ADD
, (struct sockaddr
*)&def
,
478 (struct sockaddr
*)&gate
, (struct sockaddr
*)&mask
,
483 /* Add a route to a given interface as default */
485 defrouter_addifreq(struct ifnet
*ifp
)
487 struct sockaddr_in6 def
, mask
;
491 bzero(&def
, sizeof(def
));
492 bzero(&mask
, sizeof(mask
));
494 def
.sin6_len
= mask
.sin6_len
= sizeof(struct sockaddr_in6
);
495 def
.sin6_family
= mask
.sin6_family
= AF_INET6
;
498 * Search for an ifaddr beloging to the specified interface.
499 * XXX: An IPv6 address are required to be assigned on the interface.
501 if ((ifa
= ifaof_ifpforaddr((struct sockaddr
*)&def
, ifp
)) == NULL
) {
502 nd6log((LOG_ERR
, /* better error? */
503 "defrouter_addifreq: failed to find an ifaddr "
504 "to install a route to interface %s\n",
509 flags
= ifa
->ifa_flags
;
510 error
= rtrequest_global(RTM_ADD
,
511 (struct sockaddr
*)&def
,
513 (struct sockaddr
*)&mask
,
517 "defrouter_addifreq: failed to install a route to "
518 "interface %s (errno = %d)\n",
519 if_name(ifp
), error
));
523 struct nd_defrouter
*
524 defrouter_lookup(struct in6_addr
*addr
, struct ifnet
*ifp
)
526 struct nd_defrouter
*dr
;
528 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
529 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
530 if (dr
->ifp
== ifp
&& IN6_ARE_ADDR_EQUAL(addr
, &dr
->rtaddr
))
534 return (NULL
); /* search failed */
538 defrouter_delreq(struct nd_defrouter
*dr
, int dofree
)
540 struct sockaddr_in6 def
, mask
, gate
;
542 bzero(&def
, sizeof(def
));
543 bzero(&mask
, sizeof(mask
));
544 bzero(&gate
, sizeof(gate
));
546 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
547 = sizeof(struct sockaddr_in6
);
548 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
549 gate
.sin6_addr
= dr
->rtaddr
;
551 rtrequest_global(RTM_DELETE
,
552 (struct sockaddr
*)&def
,
553 (struct sockaddr
*)&gate
,
554 (struct sockaddr
*)&mask
,
556 if (dofree
) /* XXX: necessary? */
561 defrtrlist_del(struct nd_defrouter
*dr
)
563 struct nd_defrouter
*deldr
= NULL
;
564 struct nd_prefix
*pr
;
567 * Flush all the routing table entries that use the router
570 if (!ip6_forwarding
&& ip6_accept_rtadv
) {
571 /* above is a good condition? */
572 rt6_flush(&dr
->rtaddr
, dr
->ifp
);
575 if (dr
== TAILQ_FIRST(&nd_defrouter
))
576 deldr
= dr
; /* The router is primary. */
578 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
581 * Also delete all the pointers to the router in each prefix lists.
583 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
584 struct nd_pfxrouter
*pfxrtr
;
585 if ((pfxrtr
= pfxrtr_lookup(pr
, dr
)) != NULL
)
588 pfxlist_onlink_check();
591 * If the router is the primary one, choose a new one.
592 * Note that defrouter_select() will remove the current gateway
593 * from the routing table.
602 * Default Router Selection according to Section 6.3.6 of RFC 2461:
603 * 1) Routers that are reachable or probably reachable should be
605 * 2) When no routers on the list are known to be reachable or
606 * probably reachable, routers SHOULD be selected in a round-robin
608 * 3) If the Default Router List is empty, assume that all
609 * destinations are on-link.
612 defrouter_select(void)
614 struct nd_defrouter
*dr
, anydr
;
615 struct rtentry
*rt
= NULL
;
616 struct llinfo_nd6
*ln
= NULL
;
621 * Search for a (probably) reachable router from the list.
623 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
624 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
625 if ((rt
= nd6_lookup(&dr
->rtaddr
, 0, dr
->ifp
)) &&
626 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
627 ND6_IS_LLINFO_PROBREACH(ln
)) {
628 /* Got it, and move it to the head */
629 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
630 TAILQ_INSERT_HEAD(&nd_defrouter
, dr
, dr_entry
);
635 if ((dr
= TAILQ_FIRST(&nd_defrouter
))) {
637 * De-install the previous default gateway and install
639 * Note that if there is no reachable router in the list,
640 * the head entry will be used anyway.
641 * XXX: do we have to check the current routing table entry?
643 bzero(&anydr
, sizeof(anydr
));
644 defrouter_delreq(&anydr
, 0);
645 defrouter_addreq(dr
);
649 * The Default Router List is empty, so install the default
650 * route to an inteface.
651 * XXX: The specification does not say this mechanism should
652 * be restricted to hosts, but this would be not useful
653 * (even harmful) for routers.
655 if (!ip6_forwarding
) {
657 * De-install the current default route
660 bzero(&anydr
, sizeof(anydr
));
661 defrouter_delreq(&anydr
, 0);
664 * Install a route to the default interface
666 * XXX: we enable this for host only, because
667 * this may override a default route installed
668 * a user process (e.g. routing daemon) in a
671 defrouter_addifreq(nd6_defifp
);
673 nd6log((LOG_INFO
, "defrouter_select: "
674 "there's no default router and no default"
679 mtx_unlock(&nd6_mtx
);
683 static struct nd_defrouter
*
684 defrtrlist_update(struct nd_defrouter
*new)
686 struct nd_defrouter
*dr
, *n
;
690 if ((dr
= defrouter_lookup(&new->rtaddr
, new->ifp
)) != NULL
) {
692 if (new->rtlifetime
== 0) {
697 dr
->flags
= new->flags
; /* xxx flag check */
698 dr
->rtlifetime
= new->rtlifetime
;
699 dr
->expire
= new->expire
;
701 mtx_unlock(&nd6_mtx
);
705 /* entry does not exist */
706 if (new->rtlifetime
== 0) {
707 mtx_unlock(&nd6_mtx
);
711 n
= (struct nd_defrouter
*)kmalloc(sizeof(*n
), M_IP6NDP
,
714 mtx_unlock(&nd6_mtx
);
720 * Insert the new router at the end of the Default Router List.
721 * If there is no other router, install it anyway. Otherwise,
722 * just continue to use the current default router.
724 TAILQ_INSERT_TAIL(&nd_defrouter
, n
, dr_entry
);
725 if (TAILQ_FIRST(&nd_defrouter
) == n
)
727 mtx_unlock(&nd6_mtx
);
731 static struct nd_pfxrouter
*
732 pfxrtr_lookup(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
734 struct nd_pfxrouter
*search
;
736 for (search
= pr
->ndpr_advrtrs
.lh_first
; search
; search
= search
->pfr_next
) {
737 if (search
->router
== dr
)
745 pfxrtr_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
747 struct nd_pfxrouter
*new;
749 new = (struct nd_pfxrouter
*)kmalloc(sizeof(*new), M_IP6NDP
,
755 LIST_INSERT_HEAD(&pr
->ndpr_advrtrs
, new, pfr_entry
);
757 pfxlist_onlink_check();
761 pfxrtr_del(struct nd_pfxrouter
*pfr
)
763 LIST_REMOVE(pfr
, pfr_entry
);
764 kfree(pfr
, M_IP6NDP
);
768 nd6_prefix_lookup(struct nd_prefix
*pr
)
770 struct nd_prefix
*search
;
772 for (search
= nd_prefix
.lh_first
; search
; search
= search
->ndpr_next
) {
773 if (pr
->ndpr_ifp
== search
->ndpr_ifp
&&
774 pr
->ndpr_plen
== search
->ndpr_plen
&&
775 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
776 &search
->ndpr_prefix
.sin6_addr
,
787 nd6_prelist_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
,
788 struct nd_prefix
**newp
)
790 struct nd_prefix
*new = NULL
;
793 new = (struct nd_prefix
*)kmalloc(sizeof(*new), M_IP6NDP
,
802 LIST_INIT(&new->ndpr_advrtrs
);
803 in6_prefixlen2mask(&new->ndpr_mask
, new->ndpr_plen
);
804 /* make prefix in the canonical form */
805 for (i
= 0; i
< 4; i
++)
806 new->ndpr_prefix
.sin6_addr
.s6_addr32
[i
] &=
807 new->ndpr_mask
.s6_addr32
[i
];
810 /* link ndpr_entry to nd_prefix list */
811 LIST_INSERT_HEAD(&nd_prefix
, new, ndpr_entry
);
812 mtx_unlock(&nd6_mtx
);
814 /* ND_OPT_PI_FLAG_ONLINK processing */
815 if (new->ndpr_raf_onlink
) {
818 if ((e
= nd6_prefix_onlink(new)) != 0) {
819 nd6log((LOG_ERR
, "nd6_prelist_add: failed to make "
820 "the prefix %s/%d on-link on %s (errno=%d)\n",
821 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
822 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
823 /* proceed anyway. XXX: is it correct? */
835 prelist_remove(struct nd_prefix
*pr
)
837 struct nd_pfxrouter
*pfr
, *next
;
840 /* make sure to invalidate the prefix until it is really freed. */
845 * Though these flags are now meaningless, we'd rather keep the value
846 * not to confuse users when executing "ndp -p".
848 pr
->ndpr_raf_onlink
= 0;
849 pr
->ndpr_raf_auto
= 0;
851 if ((pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
852 (e
= nd6_prefix_offlink(pr
)) != 0) {
853 nd6log((LOG_ERR
, "prelist_remove: failed to make %s/%d offlink "
855 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
856 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
857 /* what should we do? */
860 if (pr
->ndpr_refcnt
> 0)
861 return; /* notice here? */
865 /* unlink ndpr_entry from nd_prefix list */
866 LIST_REMOVE(pr
, ndpr_entry
);
868 /* free list of routers that adversed the prefix */
869 for (pfr
= pr
->ndpr_advrtrs
.lh_first
; pfr
; pfr
= next
) {
870 next
= pfr
->pfr_next
;
872 kfree(pfr
, M_IP6NDP
);
874 mtx_unlock(&nd6_mtx
);
878 pfxlist_onlink_check();
886 prelist_update(struct nd_prefix
*new, struct nd_defrouter
*dr
, struct mbuf
*m
)
888 struct in6_ifaddr
*ia6
= NULL
, *ia6_match
= NULL
;
889 struct ifaddr_container
*ifac
;
890 struct ifnet
*ifp
= new->ndpr_ifp
;
891 struct nd_prefix
*pr
;
894 struct in6_addrlifetime lt6_tmp
;
900 * Authenticity for NA consists authentication for
901 * both IP header and IP datagrams, doesn't it ?
903 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
904 auth
= (m
->m_flags
& M_AUTHIPHDR
905 && m
->m_flags
& M_AUTHIPDGM
) ? 1 : 0;
910 if ((pr
= nd6_prefix_lookup(new)) != NULL
) {
912 * nd6_prefix_lookup() ensures that pr and new have the same
913 * prefix on a same interface.
917 * Update prefix information. Note that the on-link (L) bit
918 * and the autonomous (A) bit should NOT be changed from 1
921 if (new->ndpr_raf_onlink
== 1)
922 pr
->ndpr_raf_onlink
= 1;
923 if (new->ndpr_raf_auto
== 1)
924 pr
->ndpr_raf_auto
= 1;
925 if (new->ndpr_raf_onlink
) {
926 pr
->ndpr_vltime
= new->ndpr_vltime
;
927 pr
->ndpr_pltime
= new->ndpr_pltime
;
928 pr
->ndpr_preferred
= new->ndpr_preferred
;
929 pr
->ndpr_expire
= new->ndpr_expire
;
932 if (new->ndpr_raf_onlink
&&
933 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
936 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
938 "prelist_update: failed to make "
939 "the prefix %s/%d on-link on %s "
941 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
942 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
943 /* proceed anyway. XXX: is it correct? */
947 if (dr
&& pfxrtr_lookup(pr
, dr
) == NULL
)
950 struct nd_prefix
*newpr
= NULL
;
952 if (new->ndpr_vltime
== 0)
954 if (new->ndpr_raf_onlink
== 0 && new->ndpr_raf_auto
== 0)
957 bzero(&new->ndpr_addr
, sizeof(struct in6_addr
));
959 error
= nd6_prelist_add(new, dr
, &newpr
);
960 if (error
!= 0 || newpr
== NULL
) {
961 nd6log((LOG_NOTICE
, "prelist_update: "
962 "nd6_prelist_add failed for %s/%d on %s "
963 "errno=%d, returnpr=%p\n",
964 ip6_sprintf(&new->ndpr_prefix
.sin6_addr
),
965 new->ndpr_plen
, if_name(new->ndpr_ifp
),
967 goto end
; /* we should just give up in this case. */
971 * XXX: from the ND point of view, we can ignore a prefix
972 * with the on-link bit being zero. However, we need a
973 * prefix structure for references from autoconfigured
974 * addresses. Thus, we explicitly make suret that the prefix
975 * itself expires now.
977 if (newpr
->ndpr_raf_onlink
== 0) {
978 newpr
->ndpr_vltime
= 0;
979 newpr
->ndpr_pltime
= 0;
980 in6_init_prefix_ltimes(newpr
);
987 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
988 * Note that pr must be non NULL at this point.
991 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
992 if (!new->ndpr_raf_auto
)
996 * 5.5.3 (b). the link-local prefix should have been ignored in
1001 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1002 * This should have been done in nd6_ra_input.
1006 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1007 * address already in the list, and the Valid Lifetime is not 0,
1008 * form an address. Note that even a manually configured address
1009 * should reject autoconfiguration of a new address.
1011 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
1012 struct ifaddr
*ifa
= ifac
->ifa
;
1013 struct in6_ifaddr
*ifa6
;
1015 u_int32_t storedlifetime
;
1017 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
1020 ifa6
= (struct in6_ifaddr
*)ifa
;
1023 * Spec is not clear here, but I believe we should concentrate
1024 * on unicast (i.e. not anycast) addresses.
1025 * XXX: other ia6_flags? detached or duplicated?
1027 if (ifa6
->ia6_flags
& IN6_IFF_ANYCAST
)
1030 ifa_plen
= in6_mask2len(&ifa6
->ia_prefixmask
.sin6_addr
, NULL
);
1031 if (ifa_plen
!= new->ndpr_plen
||
1032 !in6_are_prefix_equal(&ifa6
->ia_addr
.sin6_addr
,
1033 &new->ndpr_prefix
.sin6_addr
,
1037 if (ia6_match
== NULL
) /* remember the first one */
1040 if (!(ifa6
->ia6_flags
& IN6_IFF_AUTOCONF
))
1044 * An already autoconfigured address matched. Now that we
1045 * are sure there is at least one matched address, we can
1046 * proceed to 5.5.3. (e): update the lifetimes according to the
1047 * "two hours" rule and the privacy extension.
1049 #define TWOHOUR (120*60)
1050 lt6_tmp
= ifa6
->ia6_lifetime
;
1052 if (lt6_tmp
.ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1053 storedlifetime
= ND6_INFINITE_LIFETIME
;
1054 else if (IFA6_IS_INVALID(ifa6
))
1057 storedlifetime
= lt6_tmp
.ia6t_expire
- time_uptime
;
1059 /* when not updating, keep the current stored lifetime. */
1060 lt6_tmp
.ia6t_vltime
= storedlifetime
;
1062 if (TWOHOUR
< new->ndpr_vltime
||
1063 storedlifetime
< new->ndpr_vltime
) {
1064 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1065 } else if (storedlifetime
<= TWOHOUR
1068 * This condition is logically redundant, so we just
1070 * See IPng 6712, 6717, and 6721.
1072 && new->ndpr_vltime
<= storedlifetime
1076 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1080 * new->ndpr_vltime <= TWOHOUR &&
1081 * TWOHOUR < storedlifetime
1083 lt6_tmp
.ia6t_vltime
= TWOHOUR
;
1086 /* The 2 hour rule is not imposed for preferred lifetime. */
1087 lt6_tmp
.ia6t_pltime
= new->ndpr_pltime
;
1089 in6_init_address_ltimes(pr
, <6_tmp
);
1092 * When adjusting the lifetimes of an existing temporary
1093 * address, only lower the lifetimes.
1094 * RFC 3041 3.3. (1).
1095 * XXX: how should we modify ia6t_[pv]ltime?
1097 if (ifa6
->ia6_flags
& IN6_IFF_TEMPORARY
) {
1098 if (lt6_tmp
.ia6t_expire
== 0 || /* no expire */
1099 lt6_tmp
.ia6t_expire
>
1100 ifa6
->ia6_lifetime
.ia6t_expire
) {
1101 lt6_tmp
.ia6t_expire
=
1102 ifa6
->ia6_lifetime
.ia6t_expire
;
1104 if (lt6_tmp
.ia6t_preferred
== 0 || /* no expire */
1105 lt6_tmp
.ia6t_preferred
>
1106 ifa6
->ia6_lifetime
.ia6t_preferred
) {
1107 lt6_tmp
.ia6t_preferred
=
1108 ifa6
->ia6_lifetime
.ia6t_preferred
;
1112 ifa6
->ia6_lifetime
= lt6_tmp
;
1114 if (ia6_match
== NULL
&& new->ndpr_vltime
) {
1116 * No address matched and the valid lifetime is non-zero.
1117 * Create a new address.
1119 if ((ia6
= in6_ifadd(new, NULL
)) != NULL
) {
1121 * note that we should use pr (not new) for reference.
1127 /* XXXYYY Don't do this, according to Jinmei. */
1128 pr
->ndpr_addr
= new->ndpr_addr
;
1133 * When a new public address is created as described
1134 * in RFC2462, also create a new temporary address.
1137 * When an interface connects to a new link, a new
1138 * randomized interface identifier should be generated
1139 * immediately together with a new set of temporary
1140 * addresses. Thus, we specifiy 1 as the 2nd arg of
1143 if (ip6_use_tempaddr
) {
1145 if ((e
= in6_tmpifadd(ia6
, 1)) != 0) {
1146 nd6log((LOG_NOTICE
, "prelist_update: "
1147 "failed to create a temporary "
1148 "address, errno=%d\n",
1154 * A newly added address might affect the status
1155 * of other addresses, so we check and update it.
1156 * XXX: what if address duplication happens?
1158 pfxlist_onlink_check();
1160 /* just set an error. do not bark here. */
1161 error
= EADDRNOTAVAIL
; /* XXX: might be unused. */
1168 mtx_unlock(&nd6_mtx
);
1173 * A supplement function used in the on-link detection below;
1174 * detect if a given prefix has a (probably) reachable advertising router.
1175 * XXX: lengthy function name...
1177 static struct nd_pfxrouter
*
1178 find_pfxlist_reachable_router(struct nd_prefix
*pr
)
1180 struct nd_pfxrouter
*pfxrtr
;
1182 struct llinfo_nd6
*ln
;
1184 for (pfxrtr
= LIST_FIRST(&pr
->ndpr_advrtrs
); pfxrtr
;
1185 pfxrtr
= LIST_NEXT(pfxrtr
, pfr_entry
)) {
1186 if ((rt
= nd6_lookup(&pfxrtr
->router
->rtaddr
, 0,
1187 pfxrtr
->router
->ifp
)) &&
1188 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
1189 ND6_IS_LLINFO_PROBREACH(ln
))
1198 * Check if each prefix in the prefix list has at least one available router
1199 * that advertised the prefix (a router is "available" if its neighbor cache
1200 * entry is reachable or probably reachable).
1201 * If the check fails, the prefix may be off-link, because, for example,
1202 * we have moved from the network but the lifetime of the prefix has not
1203 * expired yet. So we should not use the prefix if there is another prefix
1204 * that has an available router.
1205 * But, if there is no prefix that has an available router, we still regards
1206 * all the prefixes as on-link. This is because we can't tell if all the
1207 * routers are simply dead or if we really moved from the network and there
1208 * is no router around us.
1211 pfxlist_onlink_check(void)
1213 struct nd_prefix
*pr
;
1214 struct in6_ifaddr
*ifa
;
1217 * Check if there is a prefix that has a reachable advertising
1220 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1221 if (pr
->ndpr_raf_onlink
&& find_pfxlist_reachable_router(pr
))
1227 * There is at least one prefix that has a reachable router.
1228 * Detach prefixes which have no reachable advertising
1229 * router, and attach other prefixes.
1231 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1232 /* XXX: a link-local prefix should never be detached */
1233 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1237 * we aren't interested in prefixes without the L bit
1240 if (pr
->ndpr_raf_onlink
== 0)
1243 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1244 find_pfxlist_reachable_router(pr
) == NULL
)
1245 pr
->ndpr_stateflags
|= NDPRF_DETACHED
;
1246 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1247 find_pfxlist_reachable_router(pr
) != NULL
)
1248 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1251 /* there is no prefix that has a reachable router */
1252 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1253 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1256 if (pr
->ndpr_raf_onlink
== 0)
1259 if (pr
->ndpr_stateflags
& NDPRF_DETACHED
)
1260 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1265 * Remove each interface route associated with a (just) detached
1266 * prefix, and reinstall the interface route for a (just) attached
1267 * prefix. Note that all attempt of reinstallation does not
1268 * necessarily success, when a same prefix is shared among multiple
1269 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1270 * so we don't have to care about them.
1272 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1275 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1278 if (pr
->ndpr_raf_onlink
== 0)
1281 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1282 (pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1283 if ((e
= nd6_prefix_offlink(pr
)) != 0) {
1285 "pfxlist_onlink_check: failed to "
1286 "make %s/%d offlink, errno=%d\n",
1287 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1291 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1292 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
1293 pr
->ndpr_raf_onlink
) {
1294 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
1296 "pfxlist_onlink_check: failed to "
1297 "make %s/%d offlink, errno=%d\n",
1298 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1305 * Changes on the prefix status might affect address status as well.
1306 * Make sure that all addresses derived from an attached prefix are
1307 * attached, and that all addresses derived from a detached prefix are
1308 * detached. Note, however, that a manually configured address should
1309 * always be attached.
1310 * The precise detection logic is same as the one for prefixes.
1312 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1313 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1316 if (ifa
->ia6_ndpr
== NULL
) {
1318 * This can happen when we first configure the address
1319 * (i.e. the address exists, but the prefix does not).
1320 * XXX: complicated relationships...
1325 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1329 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1330 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1333 if (ifa
->ia6_ndpr
== NULL
) /* XXX: see above. */
1336 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1337 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1339 ifa
->ia6_flags
|= IN6_IFF_DETACHED
;
1343 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1344 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1347 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1353 nd6_prefix_onlink(struct nd_prefix
*pr
)
1356 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1357 struct sockaddr_in6 mask6
;
1358 struct nd_prefix
*opr
;
1363 if (pr
->ndpr_stateflags
& NDPRF_ONLINK
) {
1365 "nd6_prefix_onlink: %s/%d is already on-link\n",
1366 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
);
1371 * Add the interface route associated with the prefix. Before
1372 * installing the route, check if there's the same prefix on another
1373 * interface, and the prefix has already installed the interface route.
1374 * Although such a configuration is expected to be rare, we explicitly
1377 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1381 if (!(opr
->ndpr_stateflags
& NDPRF_ONLINK
))
1384 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1385 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1386 &opr
->ndpr_prefix
.sin6_addr
,
1392 * We prefer link-local addresses as the associated interface address.
1394 /* search for a link-local addr */
1395 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
,
1399 struct ifaddr_container
*ifac
;
1401 /* XXX: freebsd does not have ifa_ifwithaf */
1402 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
1403 if (ifac
->ifa
->ifa_addr
->sa_family
== AF_INET6
) {
1408 /* should we care about ia6_flags? */
1412 * This can still happen, when, for example, we receive an RA
1413 * containing a prefix with the L bit set and the A bit clear,
1414 * after removing all IPv6 addresses on the receiving
1415 * interface. This should, of course, be rare though.
1418 "nd6_prefix_onlink: failed to find any ifaddr"
1419 " to add route for a prefix(%s/%d) on %s\n",
1420 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1421 pr
->ndpr_plen
, if_name(ifp
)));
1426 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1427 * ifa->ifa_rtrequest = nd6_rtrequest;
1429 bzero(&mask6
, sizeof(mask6
));
1430 mask6
.sin6_len
= sizeof(mask6
);
1431 mask6
.sin6_addr
= pr
->ndpr_mask
;
1432 rtflags
= ifa
->ifa_flags
| RTF_CLONING
| RTF_UP
;
1433 if (nd6_need_cache(ifp
)) {
1434 /* explicitly set in case ifa_flags does not set the flag. */
1435 rtflags
|= RTF_CLONING
;
1438 * explicitly clear the cloning bit in case ifa_flags sets it.
1440 rtflags
&= ~RTF_CLONING
;
1442 error
= rtrequest_global(RTM_ADD
,
1443 (struct sockaddr
*)&pr
->ndpr_prefix
,
1445 (struct sockaddr
*)&mask6
,
1448 pr
->ndpr_stateflags
|= NDPRF_ONLINK
;
1451 nd6log((LOG_ERR
, "nd6_prefix_onlink: failed to add route for a"
1452 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1454 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1455 pr
->ndpr_plen
, if_name(ifp
),
1456 ip6_sprintf(&((struct sockaddr_in6
*)ifa
->ifa_addr
)->sin6_addr
),
1457 ip6_sprintf(&mask6
.sin6_addr
), rtflags
, error
));
1463 nd6_prefix_offlink(struct nd_prefix
*pr
)
1466 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1467 struct nd_prefix
*opr
;
1468 struct sockaddr_in6 sa6
, mask6
;
1471 if (!(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1473 "nd6_prefix_offlink: %s/%d is already off-link\n",
1474 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
));
1478 bzero(&sa6
, sizeof(sa6
));
1479 sa6
.sin6_family
= AF_INET6
;
1480 sa6
.sin6_len
= sizeof(sa6
);
1481 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &sa6
.sin6_addr
,
1482 sizeof(struct in6_addr
));
1483 bzero(&mask6
, sizeof(mask6
));
1484 mask6
.sin6_family
= AF_INET6
;
1485 mask6
.sin6_len
= sizeof(sa6
);
1486 bcopy(&pr
->ndpr_mask
, &mask6
.sin6_addr
, sizeof(struct in6_addr
));
1487 error
= rtrequest_global(RTM_DELETE
,
1488 (struct sockaddr
*)&sa6
,
1490 (struct sockaddr
*)&mask6
,
1493 pr
->ndpr_stateflags
&= ~NDPRF_ONLINK
;
1496 * There might be the same prefix on another interface,
1497 * the prefix which could not be on-link just because we have
1498 * the interface route (see comments in nd6_prefix_onlink).
1499 * If there's one, try to make the prefix on-link on the
1502 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1506 if (opr
->ndpr_stateflags
& NDPRF_ONLINK
)
1510 * KAME specific: detached prefixes should not be
1513 if (opr
->ndpr_stateflags
& NDPRF_DETACHED
)
1516 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1517 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1518 &opr
->ndpr_prefix
.sin6_addr
,
1522 if ((e
= nd6_prefix_onlink(opr
)) != 0) {
1524 "nd6_prefix_offlink: failed to "
1525 "recover a prefix %s/%d from %s "
1526 "to %s (errno = %d)\n",
1527 ip6_sprintf(&opr
->ndpr_prefix
.sin6_addr
),
1528 opr
->ndpr_plen
, if_name(ifp
),
1529 if_name(opr
->ndpr_ifp
), e
));
1535 /* XXX: can we still set the NDPRF_ONLINK flag? */
1537 "nd6_prefix_offlink: failed to delete route: "
1538 "%s/%d on %s (errno = %d)\n",
1539 ip6_sprintf(&sa6
.sin6_addr
), pr
->ndpr_plen
, if_name(ifp
),
1548 * ifid: Mobile IPv6 addition
1550 static struct in6_ifaddr
*
1551 in6_ifadd(struct nd_prefix
*pr
, struct in6_addr
*ifid
)
1553 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1555 struct in6_aliasreq ifra
;
1556 struct in6_ifaddr
*ia
, *ib
;
1558 struct in6_addr mask
;
1559 int prefixlen
= pr
->ndpr_plen
;
1561 in6_len2mask(&mask
, prefixlen
);
1564 * find a link-local address (will be interface ID).
1565 * Is it really mandatory? Theoretically, a global or a site-local
1566 * address can be configured without a link-local address, if we
1567 * have a unique interface identifier...
1569 * it is not mandatory to have a link-local address, we can generate
1570 * interface identifier on the fly. we do this because:
1571 * (1) it should be the easiest way to find interface identifier.
1572 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1573 * for multiple addresses on a single interface, and possible shortcut
1574 * of DAD. we omitted DAD for this reason in the past.
1575 * (3) a user can prevent autoconfiguration of global address
1576 * by removing link-local address by hand (this is partly because we
1577 * don't have other way to control the use of IPv6 on a interface.
1578 * this has been our design choice - cf. NRL's "ifconfig auto").
1579 * (4) it is easier to manage when an interface has addresses
1580 * with the same interface identifier, than to have multiple addresses
1581 * with different interface identifiers.
1583 * Mobile IPv6 addition: allow for caller to specify a wished interface
1584 * ID. This is to not break connections when moving addresses between
1587 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
, 0);/* 0 is OK? */
1589 ib
= (struct in6_ifaddr
*)ifa
;
1593 #if 0 /* don't care link local addr state, and always do DAD */
1594 /* if link-local address is not eligible, do not autoconfigure. */
1595 if (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_NOTREADY
) {
1596 kprintf("in6_ifadd: link-local address not ready\n");
1601 /* prefixlen + ifidlen must be equal to 128 */
1602 plen0
= in6_mask2len(&ib
->ia_prefixmask
.sin6_addr
, NULL
);
1603 if (prefixlen
!= plen0
) {
1604 nd6log((LOG_INFO
, "in6_ifadd: wrong prefixlen for %s "
1605 "(prefix=%d ifid=%d)\n",
1606 if_name(ifp
), prefixlen
, 128 - plen0
));
1612 bzero(&ifra
, sizeof(ifra
));
1614 * in6_update_ifa() does not use ifra_name, but we accurately set it
1617 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1618 ifra
.ifra_addr
.sin6_family
= AF_INET6
;
1619 ifra
.ifra_addr
.sin6_len
= sizeof(struct sockaddr_in6
);
1621 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &ifra
.ifra_addr
.sin6_addr
,
1622 sizeof(ifra
.ifra_addr
.sin6_addr
));
1623 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0] &= mask
.s6_addr32
[0];
1624 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1] &= mask
.s6_addr32
[1];
1625 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] &= mask
.s6_addr32
[2];
1626 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] &= mask
.s6_addr32
[3];
1629 if (ifid
== NULL
|| IN6_IS_ADDR_UNSPECIFIED(ifid
))
1630 ifid
= &ib
->ia_addr
.sin6_addr
;
1631 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0]
1632 |= (ifid
->s6_addr32
[0] & ~mask
.s6_addr32
[0]);
1633 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1]
1634 |= (ifid
->s6_addr32
[1] & ~mask
.s6_addr32
[1]);
1635 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1636 |= (ifid
->s6_addr32
[2] & ~mask
.s6_addr32
[2]);
1637 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1638 |= (ifid
->s6_addr32
[3] & ~mask
.s6_addr32
[3]);
1640 /* new prefix mask. */
1641 ifra
.ifra_prefixmask
.sin6_len
= sizeof(struct sockaddr_in6
);
1642 ifra
.ifra_prefixmask
.sin6_family
= AF_INET6
;
1643 bcopy(&mask
, &ifra
.ifra_prefixmask
.sin6_addr
,
1644 sizeof(ifra
.ifra_prefixmask
.sin6_addr
));
1648 * XXX: in6_init_address_ltimes would override these values later.
1649 * We should reconsider this logic.
1651 ifra
.ifra_lifetime
.ia6t_vltime
= pr
->ndpr_vltime
;
1652 ifra
.ifra_lifetime
.ia6t_pltime
= pr
->ndpr_pltime
;
1654 /* XXX: scope zone ID? */
1656 ifra
.ifra_flags
|= IN6_IFF_AUTOCONF
; /* obey autoconf */
1658 * temporarily set the nopfx flag to avoid conflict.
1659 * XXX: we should reconsider the entire mechanism about prefix
1662 ifra
.ifra_flags
|= IN6_IFF_NOPFX
;
1665 * keep the new address, regardless of the result of in6_update_ifa.
1666 * XXX: this address is now meaningless.
1667 * We should reconsider its role.
1669 pr
->ndpr_addr
= ifra
.ifra_addr
.sin6_addr
;
1671 /* allocate ifaddr structure, link into chain, etc. */
1672 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0) {
1674 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1675 ip6_sprintf(&ifra
.ifra_addr
.sin6_addr
), if_name(ifp
),
1677 return (NULL
); /* ifaddr must not have been allocated. */
1680 ia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1682 return (ia
); /* this must NOT be NULL. */
1687 * ia0: corresponding public address
1690 in6_tmpifadd(const struct in6_ifaddr
*ia0
, int forcegen
)
1692 struct ifnet
*ifp
= ia0
->ia_ifa
.ifa_ifp
;
1693 struct in6_ifaddr
*newia
;
1694 struct in6_aliasreq ifra
;
1696 int trylimit
= 3; /* XXX: adhoc value */
1697 u_int32_t randid
[2];
1698 time_t vltime0
, pltime0
;
1700 bzero(&ifra
, sizeof(ifra
));
1701 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1702 ifra
.ifra_addr
= ia0
->ia_addr
;
1703 /* copy prefix mask */
1704 ifra
.ifra_prefixmask
= ia0
->ia_prefixmask
;
1705 /* clear the old IFID */
1706 for (i
= 0; i
< 4; i
++) {
1707 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[i
]
1708 &= ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[i
];
1712 in6_get_tmpifid(ifp
, (u_int8_t
*)randid
,
1713 (const u_int8_t
*)&ia0
->ia_addr
.sin6_addr
.s6_addr
[8],
1715 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1716 |= (randid
[0] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[2]));
1717 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1718 |= (randid
[1] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[3]));
1721 * If by chance the new temporary address is the same as an address
1722 * already assigned to the interface, generate a new randomized
1723 * interface identifier and repeat this step.
1726 if (in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
) != NULL
) {
1727 if (trylimit
-- == 0) {
1728 nd6log((LOG_NOTICE
, "in6_tmpifadd: failed to find "
1729 "a unique random IFID\n"));
1737 * The Valid Lifetime is the lower of the Valid Lifetime of the
1738 * public address or TEMP_VALID_LIFETIME.
1739 * The Preferred Lifetime is the lower of the Preferred Lifetime
1740 * of the public address or TEMP_PREFERRED_LIFETIME -
1743 if (ia0
->ia6_lifetime
.ia6t_expire
!= 0) {
1744 vltime0
= IFA6_IS_INVALID(ia0
) ? 0 :
1745 (ia0
->ia6_lifetime
.ia6t_expire
- time_uptime
);
1746 if (vltime0
> ip6_temp_valid_lifetime
)
1747 vltime0
= ip6_temp_valid_lifetime
;
1749 vltime0
= ip6_temp_valid_lifetime
;
1750 if (ia0
->ia6_lifetime
.ia6t_preferred
!= 0) {
1751 pltime0
= IFA6_IS_DEPRECATED(ia0
) ? 0 :
1752 (ia0
->ia6_lifetime
.ia6t_preferred
- time_uptime
);
1753 if (pltime0
> ip6_temp_preferred_lifetime
- ip6_desync_factor
) {
1754 pltime0
= ip6_temp_preferred_lifetime
-
1758 pltime0
= ip6_temp_preferred_lifetime
- ip6_desync_factor
;
1759 ifra
.ifra_lifetime
.ia6t_vltime
= vltime0
;
1760 ifra
.ifra_lifetime
.ia6t_pltime
= pltime0
;
1763 * A temporary address is created only if this calculated Preferred
1764 * Lifetime is greater than REGEN_ADVANCE time units.
1766 if (ifra
.ifra_lifetime
.ia6t_pltime
<= ip6_temp_regen_advance
)
1769 /* XXX: scope zone ID? */
1771 ifra
.ifra_flags
|= (IN6_IFF_AUTOCONF
|IN6_IFF_TEMPORARY
);
1773 /* allocate ifaddr structure, link into chain, etc. */
1774 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0)
1777 newia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1778 if (newia
== NULL
) { /* XXX: can it happen? */
1780 "in6_tmpifadd: ifa update succeeded, but we got "
1782 return (EINVAL
); /* XXX */
1784 newia
->ia6_ndpr
= ia0
->ia6_ndpr
;
1785 newia
->ia6_ndpr
->ndpr_refcnt
++;
1791 in6_init_prefix_ltimes(struct nd_prefix
*ndpr
)
1793 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1794 if (ndpr
->ndpr_pltime
> ndpr
->ndpr_vltime
) {
1795 nd6log((LOG_INFO
, "in6_init_prefix_ltimes: preferred lifetime"
1796 "(%d) is greater than valid lifetime(%d)\n",
1797 (u_int
)ndpr
->ndpr_pltime
, (u_int
)ndpr
->ndpr_vltime
));
1800 if (ndpr
->ndpr_pltime
== ND6_INFINITE_LIFETIME
)
1801 ndpr
->ndpr_preferred
= 0;
1803 ndpr
->ndpr_preferred
= time_uptime
+ ndpr
->ndpr_pltime
;
1804 if (ndpr
->ndpr_vltime
== ND6_INFINITE_LIFETIME
)
1805 ndpr
->ndpr_expire
= 0;
1807 ndpr
->ndpr_expire
= time_uptime
+ ndpr
->ndpr_vltime
;
1813 in6_init_address_ltimes(struct nd_prefix
*new, struct in6_addrlifetime
*lt6
)
1815 /* init ia6t_expire */
1816 if (lt6
->ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1817 lt6
->ia6t_expire
= 0;
1819 lt6
->ia6t_expire
= time_uptime
;
1820 lt6
->ia6t_expire
+= lt6
->ia6t_vltime
;
1823 /* init ia6t_preferred */
1824 if (lt6
->ia6t_pltime
== ND6_INFINITE_LIFETIME
)
1825 lt6
->ia6t_preferred
= 0;
1827 lt6
->ia6t_preferred
= time_uptime
;
1828 lt6
->ia6t_preferred
+= lt6
->ia6t_pltime
;
1833 * Delete all the routing table entries that use the specified gateway.
1835 * XXX: this function causes search through all entries of routing table, so
1836 * it shouldn't be called when acting as a router.
1839 rt6_flush(struct in6_addr
*gateway
, struct ifnet
*ifp
)
1841 struct radix_node_head
*rnh
= rt_tables
[mycpuid
][AF_INET6
];
1843 /* We'll care only link-local addresses */
1844 if (!IN6_IS_ADDR_LINKLOCAL(gateway
))
1846 /* XXX: hack for KAME's link-local address kludge */
1847 gateway
->s6_addr16
[1] = htons(ifp
->if_index
);
1849 rnh
->rnh_walktree(rnh
, rt6_deleteroute
, (void *)gateway
);
1853 rt6_deleteroute(struct radix_node
*rn
, void *arg
)
1855 #define SIN6(s) ((struct sockaddr_in6 *)s)
1856 struct rtentry
*rt
= (struct rtentry
*)rn
;
1857 struct in6_addr
*gate
= (struct in6_addr
*)arg
;
1859 if (rt
->rt_gateway
== NULL
|| rt
->rt_gateway
->sa_family
!= AF_INET6
)
1862 if (!IN6_ARE_ADDR_EQUAL(gate
, &SIN6(rt
->rt_gateway
)->sin6_addr
))
1866 * Do not delete a static route.
1867 * XXX: this seems to be a bit ad-hoc. Should we consider the
1868 * 'cloned' bit instead?
1870 if (rt
->rt_flags
& RTF_STATIC
)
1874 * We delete only host route. This means, in particular, we don't
1875 * delete default route.
1877 if (!(rt
->rt_flags
& RTF_HOST
))
1880 return (rtrequest(RTM_DELETE
, rt_key(rt
),
1881 rt
->rt_gateway
, rt_mask(rt
), rt
->rt_flags
, 0));
1886 nd6_setdefaultiface(int ifindex
)
1890 if (ifindex
< 0 || if_index
< ifindex
)
1893 if (nd6_defifindex
!= ifindex
) {
1894 nd6_defifindex
= ifindex
;
1895 if (nd6_defifindex
> 0)
1896 nd6_defifp
= ifindex2ifnet
[nd6_defifindex
];
1901 * If the Default Router List is empty, install a route
1902 * to the specified interface as default or remove the default
1903 * route when the default interface becomes canceled.
1904 * The check for the queue is actually redundant, but
1905 * we do this here to avoid re-install the default route
1906 * if the list is NOT empty.
1908 if (TAILQ_FIRST(&nd_defrouter
) == NULL
)
1912 * Our current implementation assumes one-to-one maping between
1913 * interfaces and links, so it would be natural to use the
1914 * default interface as the default link.
1916 scope6_setdefault(nd6_defifp
);