1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */
2 /* $DragonFly: src/sys/netinet6/nd6_rtr.c,v 1.15 2006/12/22 23:57:53 swildner Exp $ */
3 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
44 #include <sys/kernel.h>
45 #include <sys/errno.h>
46 #include <sys/syslog.h>
47 #include <sys/queue.h>
48 #include <sys/globaldata.h>
49 #include <sys/thread2.h>
52 #include <net/if_types.h>
53 #include <net/if_dl.h>
54 #include <net/route.h>
55 #include <net/radix.h>
57 #include <netinet/in.h>
58 #include <netinet6/in6_var.h>
59 #include <netinet6/in6_ifattach.h>
60 #include <netinet/ip6.h>
61 #include <netinet6/ip6_var.h>
62 #include <netinet6/nd6.h>
63 #include <netinet/icmp6.h>
64 #include <netinet6/scope6_var.h>
66 #include <net/net_osdep.h>
68 #define SDL(s) ((struct sockaddr_dl *)s)
70 static struct nd_defrouter
*defrtrlist_update (struct nd_defrouter
*);
71 static struct in6_ifaddr
*in6_ifadd (struct nd_prefix
*,
73 static struct nd_pfxrouter
*pfxrtr_lookup (struct nd_prefix
*,
74 struct nd_defrouter
*);
75 static void pfxrtr_add (struct nd_prefix
*, struct nd_defrouter
*);
76 static void pfxrtr_del (struct nd_pfxrouter
*);
77 static struct nd_pfxrouter
*find_pfxlist_reachable_router
79 static void defrouter_addifreq (struct ifnet
*);
80 static void nd6_rtmsg (int, struct rtentry
*);
82 static void in6_init_address_ltimes (struct nd_prefix
*ndpr
,
83 struct in6_addrlifetime
*lt6
);
85 static int rt6_deleteroute (struct radix_node
*, void *);
87 extern int nd6_recalc_reachtm_interval
;
89 static struct ifnet
*nd6_defifp
;
92 int ip6_use_tempaddr
= 0;
94 int ip6_desync_factor
;
95 u_int32_t ip6_temp_preferred_lifetime
= DEF_TEMP_PREFERRED_LIFETIME
;
96 u_int32_t ip6_temp_valid_lifetime
= DEF_TEMP_VALID_LIFETIME
;
98 * shorter lifetimes for debugging purposes.
99 int ip6_temp_preferred_lifetime = 800;
100 static int ip6_temp_valid_lifetime = 1800;
102 int ip6_temp_regen_advance
= TEMPADDR_REGEN_ADVANCE
;
105 * Receive Router Solicitation Message - just for routers.
106 * Router solicitation/advertisement is mostly managed by userland program
107 * (rtadvd) so here we have no function like nd6_ra_output().
112 nd6_rs_input(struct mbuf
*m
, int off
, int icmp6len
)
114 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
115 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
116 struct nd_router_solicit
*nd_rs
;
117 struct in6_addr saddr6
= ip6
->ip6_src
;
119 struct in6_addr daddr6
= ip6
->ip6_dst
;
124 struct sockaddr_dl
*sdl
= (struct sockaddr_dl
*)NULL
;
125 struct llinfo_nd6
*ln
= (struct llinfo_nd6
*)NULL
;
126 struct rtentry
*rt
= NULL
;
129 union nd_opts ndopts
;
131 /* If I'm not a router, ignore it. */
132 if (ip6_accept_rtadv
!= 0 || ip6_forwarding
!= 1)
136 if (ip6
->ip6_hlim
!= 255) {
138 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
139 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
140 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
145 * Don't update the neighbor cache, if src = ::.
146 * This indicates that the src has no IP address assigned yet.
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
))
151 #ifndef PULLDOWN_TEST
152 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
153 nd_rs
= (struct nd_router_solicit
*)((caddr_t
)ip6
+ off
);
155 IP6_EXTHDR_GET(nd_rs
, struct nd_router_solicit
*, m
, off
, icmp6len
);
157 icmp6stat
.icp6s_tooshort
++;
162 icmp6len
-= sizeof(*nd_rs
);
163 nd6_option_init(nd_rs
+ 1, icmp6len
, &ndopts
);
164 if (nd6_options(&ndopts
) < 0) {
166 "nd6_rs_input: invalid ND option, ignored\n"));
167 /* nd6_options have incremented stats */
171 if (ndopts
.nd_opts_src_lladdr
) {
172 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
173 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
176 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
178 "nd6_rs_input: lladdrlen mismatch for %s "
179 "(if %d, RS packet %d)\n",
180 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
184 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_SOLICIT
, 0);
191 icmp6stat
.icp6s_badrs
++;
196 * Receive Router Advertisement Message.
199 * TODO: on-link bit on prefix information
200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
203 nd6_ra_input(struct mbuf
*m
, int off
, int icmp6len
)
205 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
206 struct nd_ifinfo
*ndi
= ND_IFINFO(ifp
);
207 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
208 struct nd_router_advert
*nd_ra
;
209 struct in6_addr saddr6
= ip6
->ip6_src
;
211 struct in6_addr daddr6
= ip6
->ip6_dst
;
212 int flags
; /* = nd_ra->nd_ra_flags_reserved; */
213 int is_managed
= ((flags
& ND_RA_FLAG_MANAGED
) != 0);
214 int is_other
= ((flags
& ND_RA_FLAG_OTHER
) != 0);
216 union nd_opts ndopts
;
217 struct nd_defrouter
*dr
;
220 * We only accept RAs only when
221 * the system-wide variable allows the acceptance, and
222 * per-interface variable allows RAs on the receiving interface.
224 if (ip6_accept_rtadv
== 0)
226 if (!(ndi
->flags
& ND6_IFF_ACCEPT_RTADV
))
229 if (ip6
->ip6_hlim
!= 255) {
231 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
232 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
233 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
237 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6
)) {
239 "nd6_ra_input: src %s is not link-local\n",
240 ip6_sprintf(&saddr6
)));
244 #ifndef PULLDOWN_TEST
245 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
246 nd_ra
= (struct nd_router_advert
*)((caddr_t
)ip6
+ off
);
248 IP6_EXTHDR_GET(nd_ra
, struct nd_router_advert
*, m
, off
, icmp6len
);
250 icmp6stat
.icp6s_tooshort
++;
255 icmp6len
-= sizeof(*nd_ra
);
256 nd6_option_init(nd_ra
+ 1, icmp6len
, &ndopts
);
257 if (nd6_options(&ndopts
) < 0) {
259 "nd6_ra_input: invalid ND option, ignored\n"));
260 /* nd6_options have incremented stats */
265 struct nd_defrouter dr0
;
266 u_int32_t advreachable
= nd_ra
->nd_ra_reachable
;
269 dr0
.flags
= nd_ra
->nd_ra_flags_reserved
;
270 dr0
.rtlifetime
= ntohs(nd_ra
->nd_ra_router_lifetime
);
271 dr0
.expire
= time_second
+ dr0
.rtlifetime
;
273 dr0
.advint
= 0; /* Mobile IPv6 */
274 dr0
.advint_expire
= 0; /* Mobile IPv6 */
275 dr0
.advints_lost
= 0; /* Mobile IPv6 */
276 /* unspecified or not? (RFC 2461 6.3.4) */
278 advreachable
= ntohl(advreachable
);
279 if (advreachable
<= MAX_REACHABLE_TIME
&&
280 ndi
->basereachable
!= advreachable
) {
281 ndi
->basereachable
= advreachable
;
282 ndi
->reachable
= ND_COMPUTE_RTIME(ndi
->basereachable
);
283 ndi
->recalctm
= nd6_recalc_reachtm_interval
; /* reset */
286 if (nd_ra
->nd_ra_retransmit
)
287 ndi
->retrans
= ntohl(nd_ra
->nd_ra_retransmit
);
288 if (nd_ra
->nd_ra_curhoplimit
)
289 ndi
->chlim
= nd_ra
->nd_ra_curhoplimit
;
290 dr
= defrtrlist_update(&dr0
);
296 if (ndopts
.nd_opts_pi
) {
297 struct nd_opt_hdr
*pt
;
298 struct nd_opt_prefix_info
*pi
= NULL
;
301 for (pt
= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi
;
302 pt
<= (struct nd_opt_hdr
*)ndopts
.nd_opts_pi_end
;
303 pt
= (struct nd_opt_hdr
*)((caddr_t
)pt
+
304 (pt
->nd_opt_len
<< 3))) {
305 if (pt
->nd_opt_type
!= ND_OPT_PREFIX_INFORMATION
)
307 pi
= (struct nd_opt_prefix_info
*)pt
;
309 if (pi
->nd_opt_pi_len
!= 4) {
311 "nd6_ra_input: invalid option "
312 "len %d for prefix information option, "
313 "ignored\n", pi
->nd_opt_pi_len
));
317 if (128 < pi
->nd_opt_pi_prefix_len
) {
319 "nd6_ra_input: invalid prefix "
320 "len %d for prefix information option, "
321 "ignored\n", pi
->nd_opt_pi_prefix_len
));
325 if (IN6_IS_ADDR_MULTICAST(&pi
->nd_opt_pi_prefix
)
326 || IN6_IS_ADDR_LINKLOCAL(&pi
->nd_opt_pi_prefix
)) {
328 "nd6_ra_input: invalid prefix "
330 ip6_sprintf(&pi
->nd_opt_pi_prefix
)));
334 /* aggregatable unicast address, rfc2374 */
335 if ((pi
->nd_opt_pi_prefix
.s6_addr8
[0] & 0xe0) == 0x20
336 && pi
->nd_opt_pi_prefix_len
!= 64) {
338 "nd6_ra_input: invalid prefixlen "
339 "%d for rfc2374 prefix %s, ignored\n",
340 pi
->nd_opt_pi_prefix_len
,
341 ip6_sprintf(&pi
->nd_opt_pi_prefix
)));
345 bzero(&pr
, sizeof(pr
));
346 pr
.ndpr_prefix
.sin6_family
= AF_INET6
;
347 pr
.ndpr_prefix
.sin6_len
= sizeof(pr
.ndpr_prefix
);
348 pr
.ndpr_prefix
.sin6_addr
= pi
->nd_opt_pi_prefix
;
349 pr
.ndpr_ifp
= (struct ifnet
*)m
->m_pkthdr
.rcvif
;
351 pr
.ndpr_raf_onlink
= (pi
->nd_opt_pi_flags_reserved
&
352 ND_OPT_PI_FLAG_ONLINK
) ? 1 : 0;
353 pr
.ndpr_raf_auto
= (pi
->nd_opt_pi_flags_reserved
&
354 ND_OPT_PI_FLAG_AUTO
) ? 1 : 0;
355 pr
.ndpr_plen
= pi
->nd_opt_pi_prefix_len
;
356 pr
.ndpr_vltime
= ntohl(pi
->nd_opt_pi_valid_time
);
358 ntohl(pi
->nd_opt_pi_preferred_time
);
360 if (in6_init_prefix_ltimes(&pr
))
361 continue; /* prefix lifetime init failed */
363 prelist_update(&pr
, dr
, m
);
370 if (ndopts
.nd_opts_mtu
&& ndopts
.nd_opts_mtu
->nd_opt_mtu_len
== 1) {
371 u_int32_t mtu
= ntohl(ndopts
.nd_opts_mtu
->nd_opt_mtu_mtu
);
374 if (mtu
< IPV6_MMTU
) {
375 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu option "
376 "mtu=%d sent from %s, ignoring\n",
377 mtu
, ip6_sprintf(&ip6
->ip6_src
)));
383 if (mtu
<= ndi
->maxmtu
) {
384 int change
= (ndi
->linkmtu
!= mtu
);
387 if (change
) /* in6_maxmtu may change */
390 nd6log((LOG_INFO
, "nd6_ra_input: bogus mtu "
391 "mtu=%d sent from %s; "
392 "exceeds maxmtu %d, ignoring\n",
393 mtu
, ip6_sprintf(&ip6
->ip6_src
),
397 nd6log((LOG_INFO
, "nd6_ra_input: mtu option "
398 "mtu=%d sent from %s; maxmtu unknown, "
400 mtu
, ip6_sprintf(&ip6
->ip6_src
)));
407 * Source link layer address
413 if (ndopts
.nd_opts_src_lladdr
) {
414 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
415 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
418 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
420 "nd6_ra_input: lladdrlen mismatch for %s "
421 "(if %d, RA packet %d)\n",
422 ip6_sprintf(&saddr6
), ifp
->if_addrlen
, lladdrlen
- 2));
426 nd6_cache_lladdr(ifp
, &saddr6
, lladdr
, lladdrlen
, ND_ROUTER_ADVERT
, 0);
429 * Installing a link-layer address might change the state of the
430 * router's neighbor cache, which might also affect our on-link
431 * detection of adveritsed prefixes.
433 pfxlist_onlink_check();
441 icmp6stat
.icp6s_badra
++;
446 * default router list proccessing sub routines
449 /* tell the change to user processes watching the routing socket. */
451 nd6_rtmsg(int cmd
, struct rtentry
*rt
)
453 struct rt_addrinfo info
;
455 bzero((caddr_t
)&info
, sizeof(info
));
456 info
.rti_info
[RTAX_DST
] = rt_key(rt
);
457 info
.rti_info
[RTAX_GATEWAY
] = rt
->rt_gateway
;
458 info
.rti_info
[RTAX_NETMASK
] = rt_mask(rt
);
459 info
.rti_info
[RTAX_IFP
] =
460 (struct sockaddr
*)TAILQ_FIRST(&rt
->rt_ifp
->if_addrlist
);
461 info
.rti_info
[RTAX_IFA
] = rt
->rt_ifa
->ifa_addr
;
463 rt_missmsg(cmd
, &info
, rt
->rt_flags
, 0);
467 defrouter_addreq(struct nd_defrouter
*new)
469 struct sockaddr_in6 def
, mask
, gate
;
470 struct rtentry
*newrt
= NULL
;
472 bzero(&def
, sizeof(def
));
473 bzero(&mask
, sizeof(mask
));
474 bzero(&gate
, sizeof(gate
));
476 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
477 = sizeof(struct sockaddr_in6
);
478 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
479 gate
.sin6_addr
= new->rtaddr
;
482 rtrequest(RTM_ADD
, (struct sockaddr
*)&def
, (struct sockaddr
*)&gate
,
483 (struct sockaddr
*)&mask
, RTF_GATEWAY
, &newrt
);
485 nd6_rtmsg(RTM_ADD
, newrt
); /* tell user process */
492 /* Add a route to a given interface as default */
494 defrouter_addifreq(struct ifnet
*ifp
)
496 struct sockaddr_in6 def
, mask
;
498 struct rtentry
*newrt
= NULL
;
501 bzero(&def
, sizeof(def
));
502 bzero(&mask
, sizeof(mask
));
504 def
.sin6_len
= mask
.sin6_len
= sizeof(struct sockaddr_in6
);
505 def
.sin6_family
= mask
.sin6_family
= AF_INET6
;
508 * Search for an ifaddr beloging to the specified interface.
509 * XXX: An IPv6 address are required to be assigned on the interface.
511 if ((ifa
= ifaof_ifpforaddr((struct sockaddr
*)&def
, ifp
)) == NULL
) {
512 nd6log((LOG_ERR
, /* better error? */
513 "defrouter_addifreq: failed to find an ifaddr "
514 "to install a route to interface %s\n",
519 flags
= ifa
->ifa_flags
;
520 error
= rtrequest(RTM_ADD
, (struct sockaddr
*)&def
, ifa
->ifa_addr
,
521 (struct sockaddr
*)&mask
, flags
, &newrt
);
524 "defrouter_addifreq: failed to install a route to "
525 "interface %s (errno = %d)\n",
526 if_name(ifp
), error
));
528 if (newrt
) /* maybe unnecessary, but do it for safety */
532 nd6_rtmsg(RTM_ADD
, newrt
);
538 struct nd_defrouter
*
539 defrouter_lookup(struct in6_addr
*addr
, struct ifnet
*ifp
)
541 struct nd_defrouter
*dr
;
543 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
544 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
545 if (dr
->ifp
== ifp
&& IN6_ARE_ADDR_EQUAL(addr
, &dr
->rtaddr
))
549 return (NULL
); /* search failed */
553 defrouter_delreq(struct nd_defrouter
*dr
, int dofree
)
555 struct sockaddr_in6 def
, mask
, gate
;
556 struct rtentry
*oldrt
= NULL
;
558 bzero(&def
, sizeof(def
));
559 bzero(&mask
, sizeof(mask
));
560 bzero(&gate
, sizeof(gate
));
562 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
563 = sizeof(struct sockaddr_in6
);
564 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
565 gate
.sin6_addr
= dr
->rtaddr
;
567 rtrequest(RTM_DELETE
, (struct sockaddr
*)&def
,
568 (struct sockaddr
*)&gate
,
569 (struct sockaddr
*)&mask
,
570 RTF_GATEWAY
, &oldrt
);
572 nd6_rtmsg(RTM_DELETE
, oldrt
);
573 if (oldrt
->rt_refcnt
<= 0) {
575 * XXX: borrowed from the RTM_DELETE case of
583 if (dofree
) /* XXX: necessary? */
588 defrtrlist_del(struct nd_defrouter
*dr
)
590 struct nd_defrouter
*deldr
= NULL
;
591 struct nd_prefix
*pr
;
594 * Flush all the routing table entries that use the router
597 if (!ip6_forwarding
&& ip6_accept_rtadv
) {
598 /* above is a good condition? */
599 rt6_flush(&dr
->rtaddr
, dr
->ifp
);
602 if (dr
== TAILQ_FIRST(&nd_defrouter
))
603 deldr
= dr
; /* The router is primary. */
605 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
608 * Also delete all the pointers to the router in each prefix lists.
610 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
611 struct nd_pfxrouter
*pfxrtr
;
612 if ((pfxrtr
= pfxrtr_lookup(pr
, dr
)) != NULL
)
615 pfxlist_onlink_check();
618 * If the router is the primary one, choose a new one.
619 * Note that defrouter_select() will remove the current gateway
620 * from the routing table.
629 * Default Router Selection according to Section 6.3.6 of RFC 2461:
630 * 1) Routers that are reachable or probably reachable should be
632 * 2) When no routers on the list are known to be reachable or
633 * probably reachable, routers SHOULD be selected in a round-robin
635 * 3) If the Default Router List is empty, assume that all
636 * destinations are on-link.
639 defrouter_select(void)
641 struct nd_defrouter
*dr
, anydr
;
642 struct rtentry
*rt
= NULL
;
643 struct llinfo_nd6
*ln
= NULL
;
648 * Search for a (probably) reachable router from the list.
650 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
651 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
652 if ((rt
= nd6_lookup(&dr
->rtaddr
, 0, dr
->ifp
)) &&
653 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
654 ND6_IS_LLINFO_PROBREACH(ln
)) {
655 /* Got it, and move it to the head */
656 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
657 TAILQ_INSERT_HEAD(&nd_defrouter
, dr
, dr_entry
);
662 if ((dr
= TAILQ_FIRST(&nd_defrouter
))) {
664 * De-install the previous default gateway and install
666 * Note that if there is no reachable router in the list,
667 * the head entry will be used anyway.
668 * XXX: do we have to check the current routing table entry?
670 bzero(&anydr
, sizeof(anydr
));
671 defrouter_delreq(&anydr
, 0);
672 defrouter_addreq(dr
);
676 * The Default Router List is empty, so install the default
677 * route to an inteface.
678 * XXX: The specification does not say this mechanism should
679 * be restricted to hosts, but this would be not useful
680 * (even harmful) for routers.
682 if (!ip6_forwarding
) {
684 * De-install the current default route
687 bzero(&anydr
, sizeof(anydr
));
688 defrouter_delreq(&anydr
, 0);
691 * Install a route to the default interface
693 * XXX: we enable this for host only, because
694 * this may override a default route installed
695 * a user process (e.g. routing daemon) in a
698 defrouter_addifreq(nd6_defifp
);
700 nd6log((LOG_INFO
, "defrouter_select: "
701 "there's no default router and no default"
711 static struct nd_defrouter
*
712 defrtrlist_update(struct nd_defrouter
*new)
714 struct nd_defrouter
*dr
, *n
;
718 if ((dr
= defrouter_lookup(&new->rtaddr
, new->ifp
)) != NULL
) {
720 if (new->rtlifetime
== 0) {
725 dr
->flags
= new->flags
; /* xxx flag check */
726 dr
->rtlifetime
= new->rtlifetime
;
727 dr
->expire
= new->expire
;
733 /* entry does not exist */
734 if (new->rtlifetime
== 0) {
739 n
= (struct nd_defrouter
*)kmalloc(sizeof(*n
), M_IP6NDP
, M_NOWAIT
);
744 bzero(n
, sizeof(*n
));
748 * Insert the new router at the end of the Default Router List.
749 * If there is no other router, install it anyway. Otherwise,
750 * just continue to use the current default router.
752 TAILQ_INSERT_TAIL(&nd_defrouter
, n
, dr_entry
);
753 if (TAILQ_FIRST(&nd_defrouter
) == n
)
759 static struct nd_pfxrouter
*
760 pfxrtr_lookup(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
762 struct nd_pfxrouter
*search
;
764 for (search
= pr
->ndpr_advrtrs
.lh_first
; search
; search
= search
->pfr_next
) {
765 if (search
->router
== dr
)
773 pfxrtr_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
775 struct nd_pfxrouter
*new;
777 new = (struct nd_pfxrouter
*)kmalloc(sizeof(*new), M_IP6NDP
, M_NOWAIT
);
780 bzero(new, sizeof(*new));
783 LIST_INSERT_HEAD(&pr
->ndpr_advrtrs
, new, pfr_entry
);
785 pfxlist_onlink_check();
789 pfxrtr_del(struct nd_pfxrouter
*pfr
)
791 LIST_REMOVE(pfr
, pfr_entry
);
792 kfree(pfr
, M_IP6NDP
);
796 nd6_prefix_lookup(struct nd_prefix
*pr
)
798 struct nd_prefix
*search
;
800 for (search
= nd_prefix
.lh_first
; search
; search
= search
->ndpr_next
) {
801 if (pr
->ndpr_ifp
== search
->ndpr_ifp
&&
802 pr
->ndpr_plen
== search
->ndpr_plen
&&
803 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
804 &search
->ndpr_prefix
.sin6_addr
,
815 nd6_prelist_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
,
816 struct nd_prefix
**newp
)
818 struct nd_prefix
*new = NULL
;
821 new = (struct nd_prefix
*)kmalloc(sizeof(*new), M_IP6NDP
, M_NOWAIT
);
824 bzero(new, sizeof(*new));
830 LIST_INIT(&new->ndpr_advrtrs
);
831 in6_prefixlen2mask(&new->ndpr_mask
, new->ndpr_plen
);
832 /* make prefix in the canonical form */
833 for (i
= 0; i
< 4; i
++)
834 new->ndpr_prefix
.sin6_addr
.s6_addr32
[i
] &=
835 new->ndpr_mask
.s6_addr32
[i
];
838 /* link ndpr_entry to nd_prefix list */
839 LIST_INSERT_HEAD(&nd_prefix
, new, ndpr_entry
);
842 /* ND_OPT_PI_FLAG_ONLINK processing */
843 if (new->ndpr_raf_onlink
) {
846 if ((e
= nd6_prefix_onlink(new)) != 0) {
847 nd6log((LOG_ERR
, "nd6_prelist_add: failed to make "
848 "the prefix %s/%d on-link on %s (errno=%d)\n",
849 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
850 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
851 /* proceed anyway. XXX: is it correct? */
863 prelist_remove(struct nd_prefix
*pr
)
865 struct nd_pfxrouter
*pfr
, *next
;
868 /* make sure to invalidate the prefix until it is really freed. */
873 * Though these flags are now meaningless, we'd rather keep the value
874 * not to confuse users when executing "ndp -p".
876 pr
->ndpr_raf_onlink
= 0;
877 pr
->ndpr_raf_auto
= 0;
879 if ((pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
880 (e
= nd6_prefix_offlink(pr
)) != 0) {
881 nd6log((LOG_ERR
, "prelist_remove: failed to make %s/%d offlink "
883 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
884 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
885 /* what should we do? */
888 if (pr
->ndpr_refcnt
> 0)
889 return; /* notice here? */
893 /* unlink ndpr_entry from nd_prefix list */
894 LIST_REMOVE(pr
, ndpr_entry
);
896 /* free list of routers that adversed the prefix */
897 for (pfr
= pr
->ndpr_advrtrs
.lh_first
; pfr
; pfr
= next
) {
898 next
= pfr
->pfr_next
;
900 kfree(pfr
, M_IP6NDP
);
906 pfxlist_onlink_check();
914 prelist_update(struct nd_prefix
*new, struct nd_defrouter
*dr
, struct mbuf
*m
)
916 struct in6_ifaddr
*ia6
= NULL
, *ia6_match
= NULL
;
918 struct ifnet
*ifp
= new->ndpr_ifp
;
919 struct nd_prefix
*pr
;
923 struct in6_addrlifetime lt6_tmp
;
929 * Authenticity for NA consists authentication for
930 * both IP header and IP datagrams, doesn't it ?
932 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
933 auth
= (m
->m_flags
& M_AUTHIPHDR
934 && m
->m_flags
& M_AUTHIPDGM
) ? 1 : 0;
939 if ((pr
= nd6_prefix_lookup(new)) != NULL
) {
941 * nd6_prefix_lookup() ensures that pr and new have the same
942 * prefix on a same interface.
946 * Update prefix information. Note that the on-link (L) bit
947 * and the autonomous (A) bit should NOT be changed from 1
950 if (new->ndpr_raf_onlink
== 1)
951 pr
->ndpr_raf_onlink
= 1;
952 if (new->ndpr_raf_auto
== 1)
953 pr
->ndpr_raf_auto
= 1;
954 if (new->ndpr_raf_onlink
) {
955 pr
->ndpr_vltime
= new->ndpr_vltime
;
956 pr
->ndpr_pltime
= new->ndpr_pltime
;
957 pr
->ndpr_preferred
= new->ndpr_preferred
;
958 pr
->ndpr_expire
= new->ndpr_expire
;
961 if (new->ndpr_raf_onlink
&&
962 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
965 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
967 "prelist_update: failed to make "
968 "the prefix %s/%d on-link on %s "
970 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
971 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
972 /* proceed anyway. XXX: is it correct? */
976 if (dr
&& pfxrtr_lookup(pr
, dr
) == NULL
)
979 struct nd_prefix
*newpr
= NULL
;
983 if (new->ndpr_vltime
== 0)
985 if (new->ndpr_raf_onlink
== 0 && new->ndpr_raf_auto
== 0)
988 bzero(&new->ndpr_addr
, sizeof(struct in6_addr
));
990 error
= nd6_prelist_add(new, dr
, &newpr
);
991 if (error
!= 0 || newpr
== NULL
) {
992 nd6log((LOG_NOTICE
, "prelist_update: "
993 "nd6_prelist_add failed for %s/%d on %s "
994 "errno=%d, returnpr=%p\n",
995 ip6_sprintf(&new->ndpr_prefix
.sin6_addr
),
996 new->ndpr_plen
, if_name(new->ndpr_ifp
),
998 goto end
; /* we should just give up in this case. */
1002 * XXX: from the ND point of view, we can ignore a prefix
1003 * with the on-link bit being zero. However, we need a
1004 * prefix structure for references from autoconfigured
1005 * addresses. Thus, we explicitly make suret that the prefix
1006 * itself expires now.
1008 if (newpr
->ndpr_raf_onlink
== 0) {
1009 newpr
->ndpr_vltime
= 0;
1010 newpr
->ndpr_pltime
= 0;
1011 in6_init_prefix_ltimes(newpr
);
1018 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1019 * Note that pr must be non NULL at this point.
1022 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1023 if (!new->ndpr_raf_auto
)
1027 * 5.5.3 (b). the link-local prefix should have been ignored in
1032 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1033 * This should have been done in nd6_ra_input.
1037 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1038 * address already in the list, and the Valid Lifetime is not 0,
1039 * form an address. Note that even a manually configured address
1040 * should reject autoconfiguration of a new address.
1042 TAILQ_FOREACH(ifa
, &ifp
->if_addrlist
, ifa_list
)
1044 struct in6_ifaddr
*ifa6
;
1046 u_int32_t storedlifetime
;
1048 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
1051 ifa6
= (struct in6_ifaddr
*)ifa
;
1054 * Spec is not clear here, but I believe we should concentrate
1055 * on unicast (i.e. not anycast) addresses.
1056 * XXX: other ia6_flags? detached or duplicated?
1058 if (ifa6
->ia6_flags
& IN6_IFF_ANYCAST
)
1061 ifa_plen
= in6_mask2len(&ifa6
->ia_prefixmask
.sin6_addr
, NULL
);
1062 if (ifa_plen
!= new->ndpr_plen
||
1063 !in6_are_prefix_equal(&ifa6
->ia_addr
.sin6_addr
,
1064 &new->ndpr_prefix
.sin6_addr
,
1068 if (ia6_match
== NULL
) /* remember the first one */
1071 if (!(ifa6
->ia6_flags
& IN6_IFF_AUTOCONF
))
1075 * An already autoconfigured address matched. Now that we
1076 * are sure there is at least one matched address, we can
1077 * proceed to 5.5.3. (e): update the lifetimes according to the
1078 * "two hours" rule and the privacy extension.
1080 #define TWOHOUR (120*60)
1081 lt6_tmp
= ifa6
->ia6_lifetime
;
1083 if (lt6_tmp
.ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1084 storedlifetime
= ND6_INFINITE_LIFETIME
;
1085 else if (IFA6_IS_INVALID(ifa6
))
1088 storedlifetime
= lt6_tmp
.ia6t_expire
- time_second
;
1090 /* when not updating, keep the current stored lifetime. */
1091 lt6_tmp
.ia6t_vltime
= storedlifetime
;
1093 if (TWOHOUR
< new->ndpr_vltime
||
1094 storedlifetime
< new->ndpr_vltime
) {
1095 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1096 } else if (storedlifetime
<= TWOHOUR
1099 * This condition is logically redundant, so we just
1101 * See IPng 6712, 6717, and 6721.
1103 && new->ndpr_vltime
<= storedlifetime
1107 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1111 * new->ndpr_vltime <= TWOHOUR &&
1112 * TWOHOUR < storedlifetime
1114 lt6_tmp
.ia6t_vltime
= TWOHOUR
;
1117 /* The 2 hour rule is not imposed for preferred lifetime. */
1118 lt6_tmp
.ia6t_pltime
= new->ndpr_pltime
;
1120 in6_init_address_ltimes(pr
, <6_tmp
);
1123 * When adjusting the lifetimes of an existing temporary
1124 * address, only lower the lifetimes.
1125 * RFC 3041 3.3. (1).
1126 * XXX: how should we modify ia6t_[pv]ltime?
1128 if (ifa6
->ia6_flags
& IN6_IFF_TEMPORARY
) {
1129 if (lt6_tmp
.ia6t_expire
== 0 || /* no expire */
1130 lt6_tmp
.ia6t_expire
>
1131 ifa6
->ia6_lifetime
.ia6t_expire
) {
1132 lt6_tmp
.ia6t_expire
=
1133 ifa6
->ia6_lifetime
.ia6t_expire
;
1135 if (lt6_tmp
.ia6t_preferred
== 0 || /* no expire */
1136 lt6_tmp
.ia6t_preferred
>
1137 ifa6
->ia6_lifetime
.ia6t_preferred
) {
1138 lt6_tmp
.ia6t_preferred
=
1139 ifa6
->ia6_lifetime
.ia6t_preferred
;
1143 ifa6
->ia6_lifetime
= lt6_tmp
;
1145 if (ia6_match
== NULL
&& new->ndpr_vltime
) {
1147 * No address matched and the valid lifetime is non-zero.
1148 * Create a new address.
1150 if ((ia6
= in6_ifadd(new, NULL
)) != NULL
) {
1152 * note that we should use pr (not new) for reference.
1158 /* XXXYYY Don't do this, according to Jinmei. */
1159 pr
->ndpr_addr
= new->ndpr_addr
;
1164 * When a new public address is created as described
1165 * in RFC2462, also create a new temporary address.
1168 * When an interface connects to a new link, a new
1169 * randomized interface identifier should be generated
1170 * immediately together with a new set of temporary
1171 * addresses. Thus, we specifiy 1 as the 2nd arg of
1174 if (ip6_use_tempaddr
) {
1176 if ((e
= in6_tmpifadd(ia6
, 1)) != 0) {
1177 nd6log((LOG_NOTICE
, "prelist_update: "
1178 "failed to create a temporary "
1179 "address, errno=%d\n",
1185 * A newly added address might affect the status
1186 * of other addresses, so we check and update it.
1187 * XXX: what if address duplication happens?
1189 pfxlist_onlink_check();
1191 /* just set an error. do not bark here. */
1192 error
= EADDRNOTAVAIL
; /* XXX: might be unused. */
1204 * A supplement function used in the on-link detection below;
1205 * detect if a given prefix has a (probably) reachable advertising router.
1206 * XXX: lengthy function name...
1208 static struct nd_pfxrouter
*
1209 find_pfxlist_reachable_router(struct nd_prefix
*pr
)
1211 struct nd_pfxrouter
*pfxrtr
;
1213 struct llinfo_nd6
*ln
;
1215 for (pfxrtr
= LIST_FIRST(&pr
->ndpr_advrtrs
); pfxrtr
;
1216 pfxrtr
= LIST_NEXT(pfxrtr
, pfr_entry
)) {
1217 if ((rt
= nd6_lookup(&pfxrtr
->router
->rtaddr
, 0,
1218 pfxrtr
->router
->ifp
)) &&
1219 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
1220 ND6_IS_LLINFO_PROBREACH(ln
))
1229 * Check if each prefix in the prefix list has at least one available router
1230 * that advertised the prefix (a router is "available" if its neighbor cache
1231 * entry is reachable or probably reachable).
1232 * If the check fails, the prefix may be off-link, because, for example,
1233 * we have moved from the network but the lifetime of the prefix has not
1234 * expired yet. So we should not use the prefix if there is another prefix
1235 * that has an available router.
1236 * But, if there is no prefix that has an available router, we still regards
1237 * all the prefixes as on-link. This is because we can't tell if all the
1238 * routers are simply dead or if we really moved from the network and there
1239 * is no router around us.
1242 pfxlist_onlink_check(void)
1244 struct nd_prefix
*pr
;
1245 struct in6_ifaddr
*ifa
;
1248 * Check if there is a prefix that has a reachable advertising
1251 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1252 if (pr
->ndpr_raf_onlink
&& find_pfxlist_reachable_router(pr
))
1258 * There is at least one prefix that has a reachable router.
1259 * Detach prefixes which have no reachable advertising
1260 * router, and attach other prefixes.
1262 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1263 /* XXX: a link-local prefix should never be detached */
1264 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1268 * we aren't interested in prefixes without the L bit
1271 if (pr
->ndpr_raf_onlink
== 0)
1274 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1275 find_pfxlist_reachable_router(pr
) == NULL
)
1276 pr
->ndpr_stateflags
|= NDPRF_DETACHED
;
1277 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1278 find_pfxlist_reachable_router(pr
) != 0)
1279 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1282 /* there is no prefix that has a reachable router */
1283 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1284 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1287 if (pr
->ndpr_raf_onlink
== 0)
1290 if (pr
->ndpr_stateflags
& NDPRF_DETACHED
)
1291 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1296 * Remove each interface route associated with a (just) detached
1297 * prefix, and reinstall the interface route for a (just) attached
1298 * prefix. Note that all attempt of reinstallation does not
1299 * necessarily success, when a same prefix is shared among multiple
1300 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1301 * so we don't have to care about them.
1303 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1306 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1309 if (pr
->ndpr_raf_onlink
== 0)
1312 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1313 (pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1314 if ((e
= nd6_prefix_offlink(pr
)) != 0) {
1316 "pfxlist_onlink_check: failed to "
1317 "make %s/%d offlink, errno=%d\n",
1318 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1322 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1323 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
1324 pr
->ndpr_raf_onlink
) {
1325 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
1327 "pfxlist_onlink_check: failed to "
1328 "make %s/%d offlink, errno=%d\n",
1329 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1336 * Changes on the prefix status might affect address status as well.
1337 * Make sure that all addresses derived from an attached prefix are
1338 * attached, and that all addresses derived from a detached prefix are
1339 * detached. Note, however, that a manually configured address should
1340 * always be attached.
1341 * The precise detection logic is same as the one for prefixes.
1343 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1344 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1347 if (ifa
->ia6_ndpr
== NULL
) {
1349 * This can happen when we first configure the address
1350 * (i.e. the address exists, but the prefix does not).
1351 * XXX: complicated relationships...
1356 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1360 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1361 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1364 if (ifa
->ia6_ndpr
== NULL
) /* XXX: see above. */
1367 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1368 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1370 ifa
->ia6_flags
|= IN6_IFF_DETACHED
;
1374 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1375 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1378 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1384 nd6_prefix_onlink(struct nd_prefix
*pr
)
1387 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1388 struct sockaddr_in6 mask6
;
1389 struct nd_prefix
*opr
;
1392 struct rtentry
*rt
= NULL
;
1395 if (pr
->ndpr_stateflags
& NDPRF_ONLINK
) {
1397 "nd6_prefix_onlink: %s/%d is already on-link\n",
1398 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
);
1403 * Add the interface route associated with the prefix. Before
1404 * installing the route, check if there's the same prefix on another
1405 * interface, and the prefix has already installed the interface route.
1406 * Although such a configuration is expected to be rare, we explicitly
1409 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1413 if (!(opr
->ndpr_stateflags
& NDPRF_ONLINK
))
1416 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1417 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1418 &opr
->ndpr_prefix
.sin6_addr
,
1424 * We prefer link-local addresses as the associated interface address.
1426 /* search for a link-local addr */
1427 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
,
1431 /* XXX: freebsd does not have ifa_ifwithaf */
1432 TAILQ_FOREACH(ifa
, &ifp
->if_addrlist
, ifa_list
)
1434 if (ifa
->ifa_addr
->sa_family
== AF_INET6
)
1437 /* should we care about ia6_flags? */
1441 * This can still happen, when, for example, we receive an RA
1442 * containing a prefix with the L bit set and the A bit clear,
1443 * after removing all IPv6 addresses on the receiving
1444 * interface. This should, of course, be rare though.
1447 "nd6_prefix_onlink: failed to find any ifaddr"
1448 " to add route for a prefix(%s/%d) on %s\n",
1449 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1450 pr
->ndpr_plen
, if_name(ifp
)));
1455 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1456 * ifa->ifa_rtrequest = nd6_rtrequest;
1458 bzero(&mask6
, sizeof(mask6
));
1459 mask6
.sin6_len
= sizeof(mask6
);
1460 mask6
.sin6_addr
= pr
->ndpr_mask
;
1461 rtflags
= ifa
->ifa_flags
| RTF_CLONING
| RTF_UP
;
1462 if (nd6_need_cache(ifp
)) {
1463 /* explicitly set in case ifa_flags does not set the flag. */
1464 rtflags
|= RTF_CLONING
;
1467 * explicitly clear the cloning bit in case ifa_flags sets it.
1469 rtflags
&= ~RTF_CLONING
;
1471 error
= rtrequest(RTM_ADD
, (struct sockaddr
*)&pr
->ndpr_prefix
,
1472 ifa
->ifa_addr
, (struct sockaddr
*)&mask6
,
1475 if (rt
!= NULL
) /* this should be non NULL, though */
1476 nd6_rtmsg(RTM_ADD
, rt
);
1477 pr
->ndpr_stateflags
|= NDPRF_ONLINK
;
1480 nd6log((LOG_ERR
, "nd6_prefix_onlink: failed to add route for a"
1481 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1483 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1484 pr
->ndpr_plen
, if_name(ifp
),
1485 ip6_sprintf(&((struct sockaddr_in6
*)ifa
->ifa_addr
)->sin6_addr
),
1486 ip6_sprintf(&mask6
.sin6_addr
), rtflags
, error
));
1496 nd6_prefix_offlink(struct nd_prefix
*pr
)
1499 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1500 struct nd_prefix
*opr
;
1501 struct sockaddr_in6 sa6
, mask6
;
1502 struct rtentry
*rt
= NULL
;
1505 if (!(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1507 "nd6_prefix_offlink: %s/%d is already off-link\n",
1508 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
));
1512 bzero(&sa6
, sizeof(sa6
));
1513 sa6
.sin6_family
= AF_INET6
;
1514 sa6
.sin6_len
= sizeof(sa6
);
1515 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &sa6
.sin6_addr
,
1516 sizeof(struct in6_addr
));
1517 bzero(&mask6
, sizeof(mask6
));
1518 mask6
.sin6_family
= AF_INET6
;
1519 mask6
.sin6_len
= sizeof(sa6
);
1520 bcopy(&pr
->ndpr_mask
, &mask6
.sin6_addr
, sizeof(struct in6_addr
));
1521 error
= rtrequest(RTM_DELETE
, (struct sockaddr
*)&sa6
, NULL
,
1522 (struct sockaddr
*)&mask6
, 0, &rt
);
1524 pr
->ndpr_stateflags
&= ~NDPRF_ONLINK
;
1526 /* report the route deletion to the routing socket. */
1528 nd6_rtmsg(RTM_DELETE
, rt
);
1531 * There might be the same prefix on another interface,
1532 * the prefix which could not be on-link just because we have
1533 * the interface route (see comments in nd6_prefix_onlink).
1534 * If there's one, try to make the prefix on-link on the
1537 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1541 if (opr
->ndpr_stateflags
& NDPRF_ONLINK
)
1545 * KAME specific: detached prefixes should not be
1548 if (opr
->ndpr_stateflags
& NDPRF_DETACHED
)
1551 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1552 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1553 &opr
->ndpr_prefix
.sin6_addr
,
1557 if ((e
= nd6_prefix_onlink(opr
)) != 0) {
1559 "nd6_prefix_offlink: failed to "
1560 "recover a prefix %s/%d from %s "
1561 "to %s (errno = %d)\n",
1562 ip6_sprintf(&opr
->ndpr_prefix
.sin6_addr
),
1563 opr
->ndpr_plen
, if_name(ifp
),
1564 if_name(opr
->ndpr_ifp
), e
));
1570 /* XXX: can we still set the NDPRF_ONLINK flag? */
1572 "nd6_prefix_offlink: failed to delete route: "
1573 "%s/%d on %s (errno = %d)\n",
1574 ip6_sprintf(&sa6
.sin6_addr
), pr
->ndpr_plen
, if_name(ifp
),
1579 if (rt
->rt_refcnt
<= 0) {
1580 /* XXX: we should free the entry ourselves. */
1591 * ifid: Mobile IPv6 addition
1593 static struct in6_ifaddr
*
1594 in6_ifadd(struct nd_prefix
*pr
, struct in6_addr
*ifid
)
1596 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1598 struct in6_aliasreq ifra
;
1599 struct in6_ifaddr
*ia
, *ib
;
1601 struct in6_addr mask
;
1602 int prefixlen
= pr
->ndpr_plen
;
1604 in6_len2mask(&mask
, prefixlen
);
1607 * find a link-local address (will be interface ID).
1608 * Is it really mandatory? Theoretically, a global or a site-local
1609 * address can be configured without a link-local address, if we
1610 * have a unique interface identifier...
1612 * it is not mandatory to have a link-local address, we can generate
1613 * interface identifier on the fly. we do this because:
1614 * (1) it should be the easiest way to find interface identifier.
1615 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1616 * for multiple addresses on a single interface, and possible shortcut
1617 * of DAD. we omitted DAD for this reason in the past.
1618 * (3) a user can prevent autoconfiguration of global address
1619 * by removing link-local address by hand (this is partly because we
1620 * don't have other way to control the use of IPv6 on a interface.
1621 * this has been our design choice - cf. NRL's "ifconfig auto").
1622 * (4) it is easier to manage when an interface has addresses
1623 * with the same interface identifier, than to have multiple addresses
1624 * with different interface identifiers.
1626 * Mobile IPv6 addition: allow for caller to specify a wished interface
1627 * ID. This is to not break connections when moving addresses between
1630 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
, 0);/* 0 is OK? */
1632 ib
= (struct in6_ifaddr
*)ifa
;
1636 #if 0 /* don't care link local addr state, and always do DAD */
1637 /* if link-local address is not eligible, do not autoconfigure. */
1638 if (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_NOTREADY
) {
1639 kprintf("in6_ifadd: link-local address not ready\n");
1644 /* prefixlen + ifidlen must be equal to 128 */
1645 plen0
= in6_mask2len(&ib
->ia_prefixmask
.sin6_addr
, NULL
);
1646 if (prefixlen
!= plen0
) {
1647 nd6log((LOG_INFO
, "in6_ifadd: wrong prefixlen for %s "
1648 "(prefix=%d ifid=%d)\n",
1649 if_name(ifp
), prefixlen
, 128 - plen0
));
1655 bzero(&ifra
, sizeof(ifra
));
1657 * in6_update_ifa() does not use ifra_name, but we accurately set it
1660 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1661 ifra
.ifra_addr
.sin6_family
= AF_INET6
;
1662 ifra
.ifra_addr
.sin6_len
= sizeof(struct sockaddr_in6
);
1664 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &ifra
.ifra_addr
.sin6_addr
,
1665 sizeof(ifra
.ifra_addr
.sin6_addr
));
1666 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0] &= mask
.s6_addr32
[0];
1667 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1] &= mask
.s6_addr32
[1];
1668 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] &= mask
.s6_addr32
[2];
1669 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] &= mask
.s6_addr32
[3];
1672 if (ifid
== NULL
|| IN6_IS_ADDR_UNSPECIFIED(ifid
))
1673 ifid
= &ib
->ia_addr
.sin6_addr
;
1674 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0]
1675 |= (ifid
->s6_addr32
[0] & ~mask
.s6_addr32
[0]);
1676 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1]
1677 |= (ifid
->s6_addr32
[1] & ~mask
.s6_addr32
[1]);
1678 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1679 |= (ifid
->s6_addr32
[2] & ~mask
.s6_addr32
[2]);
1680 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1681 |= (ifid
->s6_addr32
[3] & ~mask
.s6_addr32
[3]);
1683 /* new prefix mask. */
1684 ifra
.ifra_prefixmask
.sin6_len
= sizeof(struct sockaddr_in6
);
1685 ifra
.ifra_prefixmask
.sin6_family
= AF_INET6
;
1686 bcopy(&mask
, &ifra
.ifra_prefixmask
.sin6_addr
,
1687 sizeof(ifra
.ifra_prefixmask
.sin6_addr
));
1691 * XXX: in6_init_address_ltimes would override these values later.
1692 * We should reconsider this logic.
1694 ifra
.ifra_lifetime
.ia6t_vltime
= pr
->ndpr_vltime
;
1695 ifra
.ifra_lifetime
.ia6t_pltime
= pr
->ndpr_pltime
;
1697 /* XXX: scope zone ID? */
1699 ifra
.ifra_flags
|= IN6_IFF_AUTOCONF
; /* obey autoconf */
1701 * temporarily set the nopfx flag to avoid conflict.
1702 * XXX: we should reconsider the entire mechanism about prefix
1705 ifra
.ifra_flags
|= IN6_IFF_NOPFX
;
1708 * keep the new address, regardless of the result of in6_update_ifa.
1709 * XXX: this address is now meaningless.
1710 * We should reconsider its role.
1712 pr
->ndpr_addr
= ifra
.ifra_addr
.sin6_addr
;
1714 /* allocate ifaddr structure, link into chain, etc. */
1715 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0) {
1717 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1718 ip6_sprintf(&ifra
.ifra_addr
.sin6_addr
), if_name(ifp
),
1720 return (NULL
); /* ifaddr must not have been allocated. */
1723 ia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1725 return (ia
); /* this must NOT be NULL. */
1730 * ia0: corresponding public address
1733 in6_tmpifadd(const struct in6_ifaddr
*ia0
, int forcegen
)
1735 struct ifnet
*ifp
= ia0
->ia_ifa
.ifa_ifp
;
1736 struct in6_ifaddr
*newia
;
1737 struct in6_aliasreq ifra
;
1739 int trylimit
= 3; /* XXX: adhoc value */
1740 u_int32_t randid
[2];
1741 time_t vltime0
, pltime0
;
1743 bzero(&ifra
, sizeof(ifra
));
1744 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1745 ifra
.ifra_addr
= ia0
->ia_addr
;
1746 /* copy prefix mask */
1747 ifra
.ifra_prefixmask
= ia0
->ia_prefixmask
;
1748 /* clear the old IFID */
1749 for (i
= 0; i
< 4; i
++) {
1750 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[i
]
1751 &= ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[i
];
1755 in6_get_tmpifid(ifp
, (u_int8_t
*)randid
,
1756 (const u_int8_t
*)&ia0
->ia_addr
.sin6_addr
.s6_addr
[8],
1758 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1759 |= (randid
[0] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[2]));
1760 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1761 |= (randid
[1] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[3]));
1764 * If by chance the new temporary address is the same as an address
1765 * already assigned to the interface, generate a new randomized
1766 * interface identifier and repeat this step.
1769 if (in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
) != NULL
) {
1770 if (trylimit
-- == 0) {
1771 nd6log((LOG_NOTICE
, "in6_tmpifadd: failed to find "
1772 "a unique random IFID\n"));
1780 * The Valid Lifetime is the lower of the Valid Lifetime of the
1781 * public address or TEMP_VALID_LIFETIME.
1782 * The Preferred Lifetime is the lower of the Preferred Lifetime
1783 * of the public address or TEMP_PREFERRED_LIFETIME -
1786 if (ia0
->ia6_lifetime
.ia6t_expire
!= 0) {
1787 vltime0
= IFA6_IS_INVALID(ia0
) ? 0 :
1788 (ia0
->ia6_lifetime
.ia6t_expire
- time_second
);
1789 if (vltime0
> ip6_temp_valid_lifetime
)
1790 vltime0
= ip6_temp_valid_lifetime
;
1792 vltime0
= ip6_temp_valid_lifetime
;
1793 if (ia0
->ia6_lifetime
.ia6t_preferred
!= 0) {
1794 pltime0
= IFA6_IS_DEPRECATED(ia0
) ? 0 :
1795 (ia0
->ia6_lifetime
.ia6t_preferred
- time_second
);
1796 if (pltime0
> ip6_temp_preferred_lifetime
- ip6_desync_factor
) {
1797 pltime0
= ip6_temp_preferred_lifetime
-
1801 pltime0
= ip6_temp_preferred_lifetime
- ip6_desync_factor
;
1802 ifra
.ifra_lifetime
.ia6t_vltime
= vltime0
;
1803 ifra
.ifra_lifetime
.ia6t_pltime
= pltime0
;
1806 * A temporary address is created only if this calculated Preferred
1807 * Lifetime is greater than REGEN_ADVANCE time units.
1809 if (ifra
.ifra_lifetime
.ia6t_pltime
<= ip6_temp_regen_advance
)
1812 /* XXX: scope zone ID? */
1814 ifra
.ifra_flags
|= (IN6_IFF_AUTOCONF
|IN6_IFF_TEMPORARY
);
1816 /* allocate ifaddr structure, link into chain, etc. */
1817 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0)
1820 newia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1821 if (newia
== NULL
) { /* XXX: can it happen? */
1823 "in6_tmpifadd: ifa update succeeded, but we got "
1825 return (EINVAL
); /* XXX */
1827 newia
->ia6_ndpr
= ia0
->ia6_ndpr
;
1828 newia
->ia6_ndpr
->ndpr_refcnt
++;
1834 in6_init_prefix_ltimes(struct nd_prefix
*ndpr
)
1836 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1837 if (ndpr
->ndpr_pltime
> ndpr
->ndpr_vltime
) {
1838 nd6log((LOG_INFO
, "in6_init_prefix_ltimes: preferred lifetime"
1839 "(%d) is greater than valid lifetime(%d)\n",
1840 (u_int
)ndpr
->ndpr_pltime
, (u_int
)ndpr
->ndpr_vltime
));
1843 if (ndpr
->ndpr_pltime
== ND6_INFINITE_LIFETIME
)
1844 ndpr
->ndpr_preferred
= 0;
1846 ndpr
->ndpr_preferred
= time_second
+ ndpr
->ndpr_pltime
;
1847 if (ndpr
->ndpr_vltime
== ND6_INFINITE_LIFETIME
)
1848 ndpr
->ndpr_expire
= 0;
1850 ndpr
->ndpr_expire
= time_second
+ ndpr
->ndpr_vltime
;
1856 in6_init_address_ltimes(struct nd_prefix
*new, struct in6_addrlifetime
*lt6
)
1858 /* init ia6t_expire */
1859 if (lt6
->ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1860 lt6
->ia6t_expire
= 0;
1862 lt6
->ia6t_expire
= time_second
;
1863 lt6
->ia6t_expire
+= lt6
->ia6t_vltime
;
1866 /* init ia6t_preferred */
1867 if (lt6
->ia6t_pltime
== ND6_INFINITE_LIFETIME
)
1868 lt6
->ia6t_preferred
= 0;
1870 lt6
->ia6t_preferred
= time_second
;
1871 lt6
->ia6t_preferred
+= lt6
->ia6t_pltime
;
1876 * Delete all the routing table entries that use the specified gateway.
1877 * XXX: this function causes search through all entries of routing table, so
1878 * it shouldn't be called when acting as a router.
1881 rt6_flush(struct in6_addr
*gateway
, struct ifnet
*ifp
)
1883 struct radix_node_head
*rnh
= rt_tables
[mycpuid
][AF_INET6
];
1887 /* We'll care only link-local addresses */
1888 if (!IN6_IS_ADDR_LINKLOCAL(gateway
)) {
1892 /* XXX: hack for KAME's link-local address kludge */
1893 gateway
->s6_addr16
[1] = htons(ifp
->if_index
);
1895 rnh
->rnh_walktree(rnh
, rt6_deleteroute
, (void *)gateway
);
1900 rt6_deleteroute(struct radix_node
*rn
, void *arg
)
1902 #define SIN6(s) ((struct sockaddr_in6 *)s)
1903 struct rtentry
*rt
= (struct rtentry
*)rn
;
1904 struct in6_addr
*gate
= (struct in6_addr
*)arg
;
1906 if (rt
->rt_gateway
== NULL
|| rt
->rt_gateway
->sa_family
!= AF_INET6
)
1909 if (!IN6_ARE_ADDR_EQUAL(gate
, &SIN6(rt
->rt_gateway
)->sin6_addr
))
1913 * Do not delete a static route.
1914 * XXX: this seems to be a bit ad-hoc. Should we consider the
1915 * 'cloned' bit instead?
1917 if (rt
->rt_flags
& RTF_STATIC
)
1921 * We delete only host route. This means, in particular, we don't
1922 * delete default route.
1924 if (!(rt
->rt_flags
& RTF_HOST
))
1927 return (rtrequest(RTM_DELETE
, rt_key(rt
),
1928 rt
->rt_gateway
, rt_mask(rt
), rt
->rt_flags
, 0));
1933 nd6_setdefaultiface(int ifindex
)
1937 if (ifindex
< 0 || if_index
< ifindex
)
1940 if (nd6_defifindex
!= ifindex
) {
1941 nd6_defifindex
= ifindex
;
1942 if (nd6_defifindex
> 0)
1943 nd6_defifp
= ifindex2ifnet
[nd6_defifindex
];
1948 * If the Default Router List is empty, install a route
1949 * to the specified interface as default or remove the default
1950 * route when the default interface becomes canceled.
1951 * The check for the queue is actually redundant, but
1952 * we do this here to avoid re-install the default route
1953 * if the list is NOT empty.
1955 if (TAILQ_FIRST(&nd_defrouter
) == NULL
)
1959 * Our current implementation assumes one-to-one maping between
1960 * interfaces and links, so it would be natural to use the
1961 * default interface as the default link.
1963 scope6_setdefault(nd6_defifp
);