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 1.17 2008/03/07 11:34:21 sephe 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
= NULL
;
125 struct llinfo_nd6
*ln
= 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 if (TAILQ_EMPTY(&rt
->rt_ifp
->if_addrheads
[mycpuid
])) {
460 info
.rti_info
[RTAX_IFP
] = NULL
;
462 info
.rti_info
[RTAX_IFP
] =
464 TAILQ_FIRST(&rt
->rt_ifp
->if_addrheads
[mycpuid
])->ifa
;
466 info
.rti_info
[RTAX_IFA
] = rt
->rt_ifa
->ifa_addr
;
468 rt_missmsg(cmd
, &info
, rt
->rt_flags
, 0);
472 defrouter_addreq(struct nd_defrouter
*new)
474 struct sockaddr_in6 def
, mask
, gate
;
475 struct rtentry
*newrt
= NULL
;
477 bzero(&def
, sizeof(def
));
478 bzero(&mask
, sizeof(mask
));
479 bzero(&gate
, sizeof(gate
));
481 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
482 = sizeof(struct sockaddr_in6
);
483 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
484 gate
.sin6_addr
= new->rtaddr
;
487 rtrequest(RTM_ADD
, (struct sockaddr
*)&def
, (struct sockaddr
*)&gate
,
488 (struct sockaddr
*)&mask
, RTF_GATEWAY
, &newrt
);
490 nd6_rtmsg(RTM_ADD
, newrt
); /* tell user process */
497 /* Add a route to a given interface as default */
499 defrouter_addifreq(struct ifnet
*ifp
)
501 struct sockaddr_in6 def
, mask
;
503 struct rtentry
*newrt
= NULL
;
506 bzero(&def
, sizeof(def
));
507 bzero(&mask
, sizeof(mask
));
509 def
.sin6_len
= mask
.sin6_len
= sizeof(struct sockaddr_in6
);
510 def
.sin6_family
= mask
.sin6_family
= AF_INET6
;
513 * Search for an ifaddr beloging to the specified interface.
514 * XXX: An IPv6 address are required to be assigned on the interface.
516 if ((ifa
= ifaof_ifpforaddr((struct sockaddr
*)&def
, ifp
)) == NULL
) {
517 nd6log((LOG_ERR
, /* better error? */
518 "defrouter_addifreq: failed to find an ifaddr "
519 "to install a route to interface %s\n",
524 flags
= ifa
->ifa_flags
;
525 error
= rtrequest(RTM_ADD
, (struct sockaddr
*)&def
, ifa
->ifa_addr
,
526 (struct sockaddr
*)&mask
, flags
, &newrt
);
529 "defrouter_addifreq: failed to install a route to "
530 "interface %s (errno = %d)\n",
531 if_name(ifp
), error
));
533 if (newrt
) /* maybe unnecessary, but do it for safety */
537 nd6_rtmsg(RTM_ADD
, newrt
);
543 struct nd_defrouter
*
544 defrouter_lookup(struct in6_addr
*addr
, struct ifnet
*ifp
)
546 struct nd_defrouter
*dr
;
548 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
549 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
550 if (dr
->ifp
== ifp
&& IN6_ARE_ADDR_EQUAL(addr
, &dr
->rtaddr
))
554 return (NULL
); /* search failed */
558 defrouter_delreq(struct nd_defrouter
*dr
, int dofree
)
560 struct sockaddr_in6 def
, mask
, gate
;
561 struct rtentry
*oldrt
= NULL
;
563 bzero(&def
, sizeof(def
));
564 bzero(&mask
, sizeof(mask
));
565 bzero(&gate
, sizeof(gate
));
567 def
.sin6_len
= mask
.sin6_len
= gate
.sin6_len
568 = sizeof(struct sockaddr_in6
);
569 def
.sin6_family
= mask
.sin6_family
= gate
.sin6_family
= AF_INET6
;
570 gate
.sin6_addr
= dr
->rtaddr
;
572 rtrequest(RTM_DELETE
, (struct sockaddr
*)&def
,
573 (struct sockaddr
*)&gate
,
574 (struct sockaddr
*)&mask
,
575 RTF_GATEWAY
, &oldrt
);
577 nd6_rtmsg(RTM_DELETE
, oldrt
);
578 if (oldrt
->rt_refcnt
<= 0) {
580 * XXX: borrowed from the RTM_DELETE case of
588 if (dofree
) /* XXX: necessary? */
593 defrtrlist_del(struct nd_defrouter
*dr
)
595 struct nd_defrouter
*deldr
= NULL
;
596 struct nd_prefix
*pr
;
599 * Flush all the routing table entries that use the router
602 if (!ip6_forwarding
&& ip6_accept_rtadv
) {
603 /* above is a good condition? */
604 rt6_flush(&dr
->rtaddr
, dr
->ifp
);
607 if (dr
== TAILQ_FIRST(&nd_defrouter
))
608 deldr
= dr
; /* The router is primary. */
610 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
613 * Also delete all the pointers to the router in each prefix lists.
615 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
616 struct nd_pfxrouter
*pfxrtr
;
617 if ((pfxrtr
= pfxrtr_lookup(pr
, dr
)) != NULL
)
620 pfxlist_onlink_check();
623 * If the router is the primary one, choose a new one.
624 * Note that defrouter_select() will remove the current gateway
625 * from the routing table.
634 * Default Router Selection according to Section 6.3.6 of RFC 2461:
635 * 1) Routers that are reachable or probably reachable should be
637 * 2) When no routers on the list are known to be reachable or
638 * probably reachable, routers SHOULD be selected in a round-robin
640 * 3) If the Default Router List is empty, assume that all
641 * destinations are on-link.
644 defrouter_select(void)
646 struct nd_defrouter
*dr
, anydr
;
647 struct rtentry
*rt
= NULL
;
648 struct llinfo_nd6
*ln
= NULL
;
653 * Search for a (probably) reachable router from the list.
655 for (dr
= TAILQ_FIRST(&nd_defrouter
); dr
;
656 dr
= TAILQ_NEXT(dr
, dr_entry
)) {
657 if ((rt
= nd6_lookup(&dr
->rtaddr
, 0, dr
->ifp
)) &&
658 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
659 ND6_IS_LLINFO_PROBREACH(ln
)) {
660 /* Got it, and move it to the head */
661 TAILQ_REMOVE(&nd_defrouter
, dr
, dr_entry
);
662 TAILQ_INSERT_HEAD(&nd_defrouter
, dr
, dr_entry
);
667 if ((dr
= TAILQ_FIRST(&nd_defrouter
))) {
669 * De-install the previous default gateway and install
671 * Note that if there is no reachable router in the list,
672 * the head entry will be used anyway.
673 * XXX: do we have to check the current routing table entry?
675 bzero(&anydr
, sizeof(anydr
));
676 defrouter_delreq(&anydr
, 0);
677 defrouter_addreq(dr
);
681 * The Default Router List is empty, so install the default
682 * route to an inteface.
683 * XXX: The specification does not say this mechanism should
684 * be restricted to hosts, but this would be not useful
685 * (even harmful) for routers.
687 if (!ip6_forwarding
) {
689 * De-install the current default route
692 bzero(&anydr
, sizeof(anydr
));
693 defrouter_delreq(&anydr
, 0);
696 * Install a route to the default interface
698 * XXX: we enable this for host only, because
699 * this may override a default route installed
700 * a user process (e.g. routing daemon) in a
703 defrouter_addifreq(nd6_defifp
);
705 nd6log((LOG_INFO
, "defrouter_select: "
706 "there's no default router and no default"
716 static struct nd_defrouter
*
717 defrtrlist_update(struct nd_defrouter
*new)
719 struct nd_defrouter
*dr
, *n
;
723 if ((dr
= defrouter_lookup(&new->rtaddr
, new->ifp
)) != NULL
) {
725 if (new->rtlifetime
== 0) {
730 dr
->flags
= new->flags
; /* xxx flag check */
731 dr
->rtlifetime
= new->rtlifetime
;
732 dr
->expire
= new->expire
;
738 /* entry does not exist */
739 if (new->rtlifetime
== 0) {
744 n
= (struct nd_defrouter
*)kmalloc(sizeof(*n
), M_IP6NDP
,
753 * Insert the new router at the end of the Default Router List.
754 * If there is no other router, install it anyway. Otherwise,
755 * just continue to use the current default router.
757 TAILQ_INSERT_TAIL(&nd_defrouter
, n
, dr_entry
);
758 if (TAILQ_FIRST(&nd_defrouter
) == n
)
764 static struct nd_pfxrouter
*
765 pfxrtr_lookup(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
767 struct nd_pfxrouter
*search
;
769 for (search
= pr
->ndpr_advrtrs
.lh_first
; search
; search
= search
->pfr_next
) {
770 if (search
->router
== dr
)
778 pfxrtr_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
)
780 struct nd_pfxrouter
*new;
782 new = (struct nd_pfxrouter
*)kmalloc(sizeof(*new), M_IP6NDP
,
788 LIST_INSERT_HEAD(&pr
->ndpr_advrtrs
, new, pfr_entry
);
790 pfxlist_onlink_check();
794 pfxrtr_del(struct nd_pfxrouter
*pfr
)
796 LIST_REMOVE(pfr
, pfr_entry
);
797 kfree(pfr
, M_IP6NDP
);
801 nd6_prefix_lookup(struct nd_prefix
*pr
)
803 struct nd_prefix
*search
;
805 for (search
= nd_prefix
.lh_first
; search
; search
= search
->ndpr_next
) {
806 if (pr
->ndpr_ifp
== search
->ndpr_ifp
&&
807 pr
->ndpr_plen
== search
->ndpr_plen
&&
808 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
809 &search
->ndpr_prefix
.sin6_addr
,
820 nd6_prelist_add(struct nd_prefix
*pr
, struct nd_defrouter
*dr
,
821 struct nd_prefix
**newp
)
823 struct nd_prefix
*new = NULL
;
826 new = (struct nd_prefix
*)kmalloc(sizeof(*new), M_IP6NDP
,
835 LIST_INIT(&new->ndpr_advrtrs
);
836 in6_prefixlen2mask(&new->ndpr_mask
, new->ndpr_plen
);
837 /* make prefix in the canonical form */
838 for (i
= 0; i
< 4; i
++)
839 new->ndpr_prefix
.sin6_addr
.s6_addr32
[i
] &=
840 new->ndpr_mask
.s6_addr32
[i
];
843 /* link ndpr_entry to nd_prefix list */
844 LIST_INSERT_HEAD(&nd_prefix
, new, ndpr_entry
);
847 /* ND_OPT_PI_FLAG_ONLINK processing */
848 if (new->ndpr_raf_onlink
) {
851 if ((e
= nd6_prefix_onlink(new)) != 0) {
852 nd6log((LOG_ERR
, "nd6_prelist_add: failed to make "
853 "the prefix %s/%d on-link on %s (errno=%d)\n",
854 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
855 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
856 /* proceed anyway. XXX: is it correct? */
868 prelist_remove(struct nd_prefix
*pr
)
870 struct nd_pfxrouter
*pfr
, *next
;
873 /* make sure to invalidate the prefix until it is really freed. */
878 * Though these flags are now meaningless, we'd rather keep the value
879 * not to confuse users when executing "ndp -p".
881 pr
->ndpr_raf_onlink
= 0;
882 pr
->ndpr_raf_auto
= 0;
884 if ((pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
885 (e
= nd6_prefix_offlink(pr
)) != 0) {
886 nd6log((LOG_ERR
, "prelist_remove: failed to make %s/%d offlink "
888 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
889 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
890 /* what should we do? */
893 if (pr
->ndpr_refcnt
> 0)
894 return; /* notice here? */
898 /* unlink ndpr_entry from nd_prefix list */
899 LIST_REMOVE(pr
, ndpr_entry
);
901 /* free list of routers that adversed the prefix */
902 for (pfr
= pr
->ndpr_advrtrs
.lh_first
; pfr
; pfr
= next
) {
903 next
= pfr
->pfr_next
;
905 kfree(pfr
, M_IP6NDP
);
911 pfxlist_onlink_check();
919 prelist_update(struct nd_prefix
*new, struct nd_defrouter
*dr
, struct mbuf
*m
)
921 struct in6_ifaddr
*ia6
= NULL
, *ia6_match
= NULL
;
922 struct ifaddr_container
*ifac
;
923 struct ifnet
*ifp
= new->ndpr_ifp
;
924 struct nd_prefix
*pr
;
928 struct in6_addrlifetime lt6_tmp
;
934 * Authenticity for NA consists authentication for
935 * both IP header and IP datagrams, doesn't it ?
937 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
938 auth
= (m
->m_flags
& M_AUTHIPHDR
939 && m
->m_flags
& M_AUTHIPDGM
) ? 1 : 0;
944 if ((pr
= nd6_prefix_lookup(new)) != NULL
) {
946 * nd6_prefix_lookup() ensures that pr and new have the same
947 * prefix on a same interface.
951 * Update prefix information. Note that the on-link (L) bit
952 * and the autonomous (A) bit should NOT be changed from 1
955 if (new->ndpr_raf_onlink
== 1)
956 pr
->ndpr_raf_onlink
= 1;
957 if (new->ndpr_raf_auto
== 1)
958 pr
->ndpr_raf_auto
= 1;
959 if (new->ndpr_raf_onlink
) {
960 pr
->ndpr_vltime
= new->ndpr_vltime
;
961 pr
->ndpr_pltime
= new->ndpr_pltime
;
962 pr
->ndpr_preferred
= new->ndpr_preferred
;
963 pr
->ndpr_expire
= new->ndpr_expire
;
966 if (new->ndpr_raf_onlink
&&
967 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
970 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
972 "prelist_update: failed to make "
973 "the prefix %s/%d on-link on %s "
975 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
976 pr
->ndpr_plen
, if_name(pr
->ndpr_ifp
), e
));
977 /* proceed anyway. XXX: is it correct? */
981 if (dr
&& pfxrtr_lookup(pr
, dr
) == NULL
)
984 struct nd_prefix
*newpr
= NULL
;
988 if (new->ndpr_vltime
== 0)
990 if (new->ndpr_raf_onlink
== 0 && new->ndpr_raf_auto
== 0)
993 bzero(&new->ndpr_addr
, sizeof(struct in6_addr
));
995 error
= nd6_prelist_add(new, dr
, &newpr
);
996 if (error
!= 0 || newpr
== NULL
) {
997 nd6log((LOG_NOTICE
, "prelist_update: "
998 "nd6_prelist_add failed for %s/%d on %s "
999 "errno=%d, returnpr=%p\n",
1000 ip6_sprintf(&new->ndpr_prefix
.sin6_addr
),
1001 new->ndpr_plen
, if_name(new->ndpr_ifp
),
1003 goto end
; /* we should just give up in this case. */
1007 * XXX: from the ND point of view, we can ignore a prefix
1008 * with the on-link bit being zero. However, we need a
1009 * prefix structure for references from autoconfigured
1010 * addresses. Thus, we explicitly make suret that the prefix
1011 * itself expires now.
1013 if (newpr
->ndpr_raf_onlink
== 0) {
1014 newpr
->ndpr_vltime
= 0;
1015 newpr
->ndpr_pltime
= 0;
1016 in6_init_prefix_ltimes(newpr
);
1023 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1024 * Note that pr must be non NULL at this point.
1027 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1028 if (!new->ndpr_raf_auto
)
1032 * 5.5.3 (b). the link-local prefix should have been ignored in
1037 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
1038 * This should have been done in nd6_ra_input.
1042 * 5.5.3 (d). If the prefix advertised does not match the prefix of an
1043 * address already in the list, and the Valid Lifetime is not 0,
1044 * form an address. Note that even a manually configured address
1045 * should reject autoconfiguration of a new address.
1047 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
1048 struct ifaddr
*ifa
= ifac
->ifa
;
1049 struct in6_ifaddr
*ifa6
;
1051 u_int32_t storedlifetime
;
1053 if (ifa
->ifa_addr
->sa_family
!= AF_INET6
)
1056 ifa6
= (struct in6_ifaddr
*)ifa
;
1059 * Spec is not clear here, but I believe we should concentrate
1060 * on unicast (i.e. not anycast) addresses.
1061 * XXX: other ia6_flags? detached or duplicated?
1063 if (ifa6
->ia6_flags
& IN6_IFF_ANYCAST
)
1066 ifa_plen
= in6_mask2len(&ifa6
->ia_prefixmask
.sin6_addr
, NULL
);
1067 if (ifa_plen
!= new->ndpr_plen
||
1068 !in6_are_prefix_equal(&ifa6
->ia_addr
.sin6_addr
,
1069 &new->ndpr_prefix
.sin6_addr
,
1073 if (ia6_match
== NULL
) /* remember the first one */
1076 if (!(ifa6
->ia6_flags
& IN6_IFF_AUTOCONF
))
1080 * An already autoconfigured address matched. Now that we
1081 * are sure there is at least one matched address, we can
1082 * proceed to 5.5.3. (e): update the lifetimes according to the
1083 * "two hours" rule and the privacy extension.
1085 #define TWOHOUR (120*60)
1086 lt6_tmp
= ifa6
->ia6_lifetime
;
1088 if (lt6_tmp
.ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1089 storedlifetime
= ND6_INFINITE_LIFETIME
;
1090 else if (IFA6_IS_INVALID(ifa6
))
1093 storedlifetime
= lt6_tmp
.ia6t_expire
- time_second
;
1095 /* when not updating, keep the current stored lifetime. */
1096 lt6_tmp
.ia6t_vltime
= storedlifetime
;
1098 if (TWOHOUR
< new->ndpr_vltime
||
1099 storedlifetime
< new->ndpr_vltime
) {
1100 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1101 } else if (storedlifetime
<= TWOHOUR
1104 * This condition is logically redundant, so we just
1106 * See IPng 6712, 6717, and 6721.
1108 && new->ndpr_vltime
<= storedlifetime
1112 lt6_tmp
.ia6t_vltime
= new->ndpr_vltime
;
1116 * new->ndpr_vltime <= TWOHOUR &&
1117 * TWOHOUR < storedlifetime
1119 lt6_tmp
.ia6t_vltime
= TWOHOUR
;
1122 /* The 2 hour rule is not imposed for preferred lifetime. */
1123 lt6_tmp
.ia6t_pltime
= new->ndpr_pltime
;
1125 in6_init_address_ltimes(pr
, <6_tmp
);
1128 * When adjusting the lifetimes of an existing temporary
1129 * address, only lower the lifetimes.
1130 * RFC 3041 3.3. (1).
1131 * XXX: how should we modify ia6t_[pv]ltime?
1133 if (ifa6
->ia6_flags
& IN6_IFF_TEMPORARY
) {
1134 if (lt6_tmp
.ia6t_expire
== 0 || /* no expire */
1135 lt6_tmp
.ia6t_expire
>
1136 ifa6
->ia6_lifetime
.ia6t_expire
) {
1137 lt6_tmp
.ia6t_expire
=
1138 ifa6
->ia6_lifetime
.ia6t_expire
;
1140 if (lt6_tmp
.ia6t_preferred
== 0 || /* no expire */
1141 lt6_tmp
.ia6t_preferred
>
1142 ifa6
->ia6_lifetime
.ia6t_preferred
) {
1143 lt6_tmp
.ia6t_preferred
=
1144 ifa6
->ia6_lifetime
.ia6t_preferred
;
1148 ifa6
->ia6_lifetime
= lt6_tmp
;
1150 if (ia6_match
== NULL
&& new->ndpr_vltime
) {
1152 * No address matched and the valid lifetime is non-zero.
1153 * Create a new address.
1155 if ((ia6
= in6_ifadd(new, NULL
)) != NULL
) {
1157 * note that we should use pr (not new) for reference.
1163 /* XXXYYY Don't do this, according to Jinmei. */
1164 pr
->ndpr_addr
= new->ndpr_addr
;
1169 * When a new public address is created as described
1170 * in RFC2462, also create a new temporary address.
1173 * When an interface connects to a new link, a new
1174 * randomized interface identifier should be generated
1175 * immediately together with a new set of temporary
1176 * addresses. Thus, we specifiy 1 as the 2nd arg of
1179 if (ip6_use_tempaddr
) {
1181 if ((e
= in6_tmpifadd(ia6
, 1)) != 0) {
1182 nd6log((LOG_NOTICE
, "prelist_update: "
1183 "failed to create a temporary "
1184 "address, errno=%d\n",
1190 * A newly added address might affect the status
1191 * of other addresses, so we check and update it.
1192 * XXX: what if address duplication happens?
1194 pfxlist_onlink_check();
1196 /* just set an error. do not bark here. */
1197 error
= EADDRNOTAVAIL
; /* XXX: might be unused. */
1209 * A supplement function used in the on-link detection below;
1210 * detect if a given prefix has a (probably) reachable advertising router.
1211 * XXX: lengthy function name...
1213 static struct nd_pfxrouter
*
1214 find_pfxlist_reachable_router(struct nd_prefix
*pr
)
1216 struct nd_pfxrouter
*pfxrtr
;
1218 struct llinfo_nd6
*ln
;
1220 for (pfxrtr
= LIST_FIRST(&pr
->ndpr_advrtrs
); pfxrtr
;
1221 pfxrtr
= LIST_NEXT(pfxrtr
, pfr_entry
)) {
1222 if ((rt
= nd6_lookup(&pfxrtr
->router
->rtaddr
, 0,
1223 pfxrtr
->router
->ifp
)) &&
1224 (ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) &&
1225 ND6_IS_LLINFO_PROBREACH(ln
))
1234 * Check if each prefix in the prefix list has at least one available router
1235 * that advertised the prefix (a router is "available" if its neighbor cache
1236 * entry is reachable or probably reachable).
1237 * If the check fails, the prefix may be off-link, because, for example,
1238 * we have moved from the network but the lifetime of the prefix has not
1239 * expired yet. So we should not use the prefix if there is another prefix
1240 * that has an available router.
1241 * But, if there is no prefix that has an available router, we still regards
1242 * all the prefixes as on-link. This is because we can't tell if all the
1243 * routers are simply dead or if we really moved from the network and there
1244 * is no router around us.
1247 pfxlist_onlink_check(void)
1249 struct nd_prefix
*pr
;
1250 struct in6_ifaddr
*ifa
;
1253 * Check if there is a prefix that has a reachable advertising
1256 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1257 if (pr
->ndpr_raf_onlink
&& find_pfxlist_reachable_router(pr
))
1263 * There is at least one prefix that has a reachable router.
1264 * Detach prefixes which have no reachable advertising
1265 * router, and attach other prefixes.
1267 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1268 /* XXX: a link-local prefix should never be detached */
1269 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1273 * we aren't interested in prefixes without the L bit
1276 if (pr
->ndpr_raf_onlink
== 0)
1279 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1280 find_pfxlist_reachable_router(pr
) == NULL
)
1281 pr
->ndpr_stateflags
|= NDPRF_DETACHED
;
1282 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1283 find_pfxlist_reachable_router(pr
) != 0)
1284 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1287 /* there is no prefix that has a reachable router */
1288 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1289 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1292 if (pr
->ndpr_raf_onlink
== 0)
1295 if (pr
->ndpr_stateflags
& NDPRF_DETACHED
)
1296 pr
->ndpr_stateflags
&= ~NDPRF_DETACHED
;
1301 * Remove each interface route associated with a (just) detached
1302 * prefix, and reinstall the interface route for a (just) attached
1303 * prefix. Note that all attempt of reinstallation does not
1304 * necessarily success, when a same prefix is shared among multiple
1305 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1306 * so we don't have to care about them.
1308 for (pr
= nd_prefix
.lh_first
; pr
; pr
= pr
->ndpr_next
) {
1311 if (IN6_IS_ADDR_LINKLOCAL(&pr
->ndpr_prefix
.sin6_addr
))
1314 if (pr
->ndpr_raf_onlink
== 0)
1317 if ((pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1318 (pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1319 if ((e
= nd6_prefix_offlink(pr
)) != 0) {
1321 "pfxlist_onlink_check: failed to "
1322 "make %s/%d offlink, errno=%d\n",
1323 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1327 if (!(pr
->ndpr_stateflags
& NDPRF_DETACHED
) &&
1328 !(pr
->ndpr_stateflags
& NDPRF_ONLINK
) &&
1329 pr
->ndpr_raf_onlink
) {
1330 if ((e
= nd6_prefix_onlink(pr
)) != 0) {
1332 "pfxlist_onlink_check: failed to "
1333 "make %s/%d offlink, errno=%d\n",
1334 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1341 * Changes on the prefix status might affect address status as well.
1342 * Make sure that all addresses derived from an attached prefix are
1343 * attached, and that all addresses derived from a detached prefix are
1344 * detached. Note, however, that a manually configured address should
1345 * always be attached.
1346 * The precise detection logic is same as the one for prefixes.
1348 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1349 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1352 if (ifa
->ia6_ndpr
== NULL
) {
1354 * This can happen when we first configure the address
1355 * (i.e. the address exists, but the prefix does not).
1356 * XXX: complicated relationships...
1361 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1365 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1366 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1369 if (ifa
->ia6_ndpr
== NULL
) /* XXX: see above. */
1372 if (find_pfxlist_reachable_router(ifa
->ia6_ndpr
))
1373 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1375 ifa
->ia6_flags
|= IN6_IFF_DETACHED
;
1379 for (ifa
= in6_ifaddr
; ifa
; ifa
= ifa
->ia_next
) {
1380 if (!(ifa
->ia6_flags
& IN6_IFF_AUTOCONF
))
1383 ifa
->ia6_flags
&= ~IN6_IFF_DETACHED
;
1389 nd6_prefix_onlink(struct nd_prefix
*pr
)
1392 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1393 struct sockaddr_in6 mask6
;
1394 struct nd_prefix
*opr
;
1397 struct rtentry
*rt
= NULL
;
1400 if (pr
->ndpr_stateflags
& NDPRF_ONLINK
) {
1402 "nd6_prefix_onlink: %s/%d is already on-link\n",
1403 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
);
1408 * Add the interface route associated with the prefix. Before
1409 * installing the route, check if there's the same prefix on another
1410 * interface, and the prefix has already installed the interface route.
1411 * Although such a configuration is expected to be rare, we explicitly
1414 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1418 if (!(opr
->ndpr_stateflags
& NDPRF_ONLINK
))
1421 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1422 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1423 &opr
->ndpr_prefix
.sin6_addr
,
1429 * We prefer link-local addresses as the associated interface address.
1431 /* search for a link-local addr */
1432 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
,
1436 struct ifaddr_container
*ifac
;
1438 /* XXX: freebsd does not have ifa_ifwithaf */
1439 TAILQ_FOREACH(ifac
, &ifp
->if_addrheads
[mycpuid
], ifa_link
) {
1440 if (ifac
->ifa
->ifa_addr
->sa_family
== AF_INET6
) {
1445 /* should we care about ia6_flags? */
1449 * This can still happen, when, for example, we receive an RA
1450 * containing a prefix with the L bit set and the A bit clear,
1451 * after removing all IPv6 addresses on the receiving
1452 * interface. This should, of course, be rare though.
1455 "nd6_prefix_onlink: failed to find any ifaddr"
1456 " to add route for a prefix(%s/%d) on %s\n",
1457 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1458 pr
->ndpr_plen
, if_name(ifp
)));
1463 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1464 * ifa->ifa_rtrequest = nd6_rtrequest;
1466 bzero(&mask6
, sizeof(mask6
));
1467 mask6
.sin6_len
= sizeof(mask6
);
1468 mask6
.sin6_addr
= pr
->ndpr_mask
;
1469 rtflags
= ifa
->ifa_flags
| RTF_CLONING
| RTF_UP
;
1470 if (nd6_need_cache(ifp
)) {
1471 /* explicitly set in case ifa_flags does not set the flag. */
1472 rtflags
|= RTF_CLONING
;
1475 * explicitly clear the cloning bit in case ifa_flags sets it.
1477 rtflags
&= ~RTF_CLONING
;
1479 error
= rtrequest(RTM_ADD
, (struct sockaddr
*)&pr
->ndpr_prefix
,
1480 ifa
->ifa_addr
, (struct sockaddr
*)&mask6
,
1483 if (rt
!= NULL
) /* this should be non NULL, though */
1484 nd6_rtmsg(RTM_ADD
, rt
);
1485 pr
->ndpr_stateflags
|= NDPRF_ONLINK
;
1488 nd6log((LOG_ERR
, "nd6_prefix_onlink: failed to add route for a"
1489 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1491 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
),
1492 pr
->ndpr_plen
, if_name(ifp
),
1493 ip6_sprintf(&((struct sockaddr_in6
*)ifa
->ifa_addr
)->sin6_addr
),
1494 ip6_sprintf(&mask6
.sin6_addr
), rtflags
, error
));
1504 nd6_prefix_offlink(struct nd_prefix
*pr
)
1507 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1508 struct nd_prefix
*opr
;
1509 struct sockaddr_in6 sa6
, mask6
;
1510 struct rtentry
*rt
= NULL
;
1513 if (!(pr
->ndpr_stateflags
& NDPRF_ONLINK
)) {
1515 "nd6_prefix_offlink: %s/%d is already off-link\n",
1516 ip6_sprintf(&pr
->ndpr_prefix
.sin6_addr
), pr
->ndpr_plen
));
1520 bzero(&sa6
, sizeof(sa6
));
1521 sa6
.sin6_family
= AF_INET6
;
1522 sa6
.sin6_len
= sizeof(sa6
);
1523 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &sa6
.sin6_addr
,
1524 sizeof(struct in6_addr
));
1525 bzero(&mask6
, sizeof(mask6
));
1526 mask6
.sin6_family
= AF_INET6
;
1527 mask6
.sin6_len
= sizeof(sa6
);
1528 bcopy(&pr
->ndpr_mask
, &mask6
.sin6_addr
, sizeof(struct in6_addr
));
1529 error
= rtrequest(RTM_DELETE
, (struct sockaddr
*)&sa6
, NULL
,
1530 (struct sockaddr
*)&mask6
, 0, &rt
);
1532 pr
->ndpr_stateflags
&= ~NDPRF_ONLINK
;
1534 /* report the route deletion to the routing socket. */
1536 nd6_rtmsg(RTM_DELETE
, rt
);
1539 * There might be the same prefix on another interface,
1540 * the prefix which could not be on-link just because we have
1541 * the interface route (see comments in nd6_prefix_onlink).
1542 * If there's one, try to make the prefix on-link on the
1545 for (opr
= nd_prefix
.lh_first
; opr
; opr
= opr
->ndpr_next
) {
1549 if (opr
->ndpr_stateflags
& NDPRF_ONLINK
)
1553 * KAME specific: detached prefixes should not be
1556 if (opr
->ndpr_stateflags
& NDPRF_DETACHED
)
1559 if (opr
->ndpr_plen
== pr
->ndpr_plen
&&
1560 in6_are_prefix_equal(&pr
->ndpr_prefix
.sin6_addr
,
1561 &opr
->ndpr_prefix
.sin6_addr
,
1565 if ((e
= nd6_prefix_onlink(opr
)) != 0) {
1567 "nd6_prefix_offlink: failed to "
1568 "recover a prefix %s/%d from %s "
1569 "to %s (errno = %d)\n",
1570 ip6_sprintf(&opr
->ndpr_prefix
.sin6_addr
),
1571 opr
->ndpr_plen
, if_name(ifp
),
1572 if_name(opr
->ndpr_ifp
), e
));
1578 /* XXX: can we still set the NDPRF_ONLINK flag? */
1580 "nd6_prefix_offlink: failed to delete route: "
1581 "%s/%d on %s (errno = %d)\n",
1582 ip6_sprintf(&sa6
.sin6_addr
), pr
->ndpr_plen
, if_name(ifp
),
1587 if (rt
->rt_refcnt
<= 0) {
1588 /* XXX: we should free the entry ourselves. */
1599 * ifid: Mobile IPv6 addition
1601 static struct in6_ifaddr
*
1602 in6_ifadd(struct nd_prefix
*pr
, struct in6_addr
*ifid
)
1604 struct ifnet
*ifp
= pr
->ndpr_ifp
;
1606 struct in6_aliasreq ifra
;
1607 struct in6_ifaddr
*ia
, *ib
;
1609 struct in6_addr mask
;
1610 int prefixlen
= pr
->ndpr_plen
;
1612 in6_len2mask(&mask
, prefixlen
);
1615 * find a link-local address (will be interface ID).
1616 * Is it really mandatory? Theoretically, a global or a site-local
1617 * address can be configured without a link-local address, if we
1618 * have a unique interface identifier...
1620 * it is not mandatory to have a link-local address, we can generate
1621 * interface identifier on the fly. we do this because:
1622 * (1) it should be the easiest way to find interface identifier.
1623 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1624 * for multiple addresses on a single interface, and possible shortcut
1625 * of DAD. we omitted DAD for this reason in the past.
1626 * (3) a user can prevent autoconfiguration of global address
1627 * by removing link-local address by hand (this is partly because we
1628 * don't have other way to control the use of IPv6 on a interface.
1629 * this has been our design choice - cf. NRL's "ifconfig auto").
1630 * (4) it is easier to manage when an interface has addresses
1631 * with the same interface identifier, than to have multiple addresses
1632 * with different interface identifiers.
1634 * Mobile IPv6 addition: allow for caller to specify a wished interface
1635 * ID. This is to not break connections when moving addresses between
1638 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(ifp
, 0);/* 0 is OK? */
1640 ib
= (struct in6_ifaddr
*)ifa
;
1644 #if 0 /* don't care link local addr state, and always do DAD */
1645 /* if link-local address is not eligible, do not autoconfigure. */
1646 if (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_NOTREADY
) {
1647 kprintf("in6_ifadd: link-local address not ready\n");
1652 /* prefixlen + ifidlen must be equal to 128 */
1653 plen0
= in6_mask2len(&ib
->ia_prefixmask
.sin6_addr
, NULL
);
1654 if (prefixlen
!= plen0
) {
1655 nd6log((LOG_INFO
, "in6_ifadd: wrong prefixlen for %s "
1656 "(prefix=%d ifid=%d)\n",
1657 if_name(ifp
), prefixlen
, 128 - plen0
));
1663 bzero(&ifra
, sizeof(ifra
));
1665 * in6_update_ifa() does not use ifra_name, but we accurately set it
1668 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1669 ifra
.ifra_addr
.sin6_family
= AF_INET6
;
1670 ifra
.ifra_addr
.sin6_len
= sizeof(struct sockaddr_in6
);
1672 bcopy(&pr
->ndpr_prefix
.sin6_addr
, &ifra
.ifra_addr
.sin6_addr
,
1673 sizeof(ifra
.ifra_addr
.sin6_addr
));
1674 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0] &= mask
.s6_addr32
[0];
1675 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1] &= mask
.s6_addr32
[1];
1676 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2] &= mask
.s6_addr32
[2];
1677 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3] &= mask
.s6_addr32
[3];
1680 if (ifid
== NULL
|| IN6_IS_ADDR_UNSPECIFIED(ifid
))
1681 ifid
= &ib
->ia_addr
.sin6_addr
;
1682 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[0]
1683 |= (ifid
->s6_addr32
[0] & ~mask
.s6_addr32
[0]);
1684 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[1]
1685 |= (ifid
->s6_addr32
[1] & ~mask
.s6_addr32
[1]);
1686 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1687 |= (ifid
->s6_addr32
[2] & ~mask
.s6_addr32
[2]);
1688 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1689 |= (ifid
->s6_addr32
[3] & ~mask
.s6_addr32
[3]);
1691 /* new prefix mask. */
1692 ifra
.ifra_prefixmask
.sin6_len
= sizeof(struct sockaddr_in6
);
1693 ifra
.ifra_prefixmask
.sin6_family
= AF_INET6
;
1694 bcopy(&mask
, &ifra
.ifra_prefixmask
.sin6_addr
,
1695 sizeof(ifra
.ifra_prefixmask
.sin6_addr
));
1699 * XXX: in6_init_address_ltimes would override these values later.
1700 * We should reconsider this logic.
1702 ifra
.ifra_lifetime
.ia6t_vltime
= pr
->ndpr_vltime
;
1703 ifra
.ifra_lifetime
.ia6t_pltime
= pr
->ndpr_pltime
;
1705 /* XXX: scope zone ID? */
1707 ifra
.ifra_flags
|= IN6_IFF_AUTOCONF
; /* obey autoconf */
1709 * temporarily set the nopfx flag to avoid conflict.
1710 * XXX: we should reconsider the entire mechanism about prefix
1713 ifra
.ifra_flags
|= IN6_IFF_NOPFX
;
1716 * keep the new address, regardless of the result of in6_update_ifa.
1717 * XXX: this address is now meaningless.
1718 * We should reconsider its role.
1720 pr
->ndpr_addr
= ifra
.ifra_addr
.sin6_addr
;
1722 /* allocate ifaddr structure, link into chain, etc. */
1723 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0) {
1725 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1726 ip6_sprintf(&ifra
.ifra_addr
.sin6_addr
), if_name(ifp
),
1728 return (NULL
); /* ifaddr must not have been allocated. */
1731 ia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1733 return (ia
); /* this must NOT be NULL. */
1738 * ia0: corresponding public address
1741 in6_tmpifadd(const struct in6_ifaddr
*ia0
, int forcegen
)
1743 struct ifnet
*ifp
= ia0
->ia_ifa
.ifa_ifp
;
1744 struct in6_ifaddr
*newia
;
1745 struct in6_aliasreq ifra
;
1747 int trylimit
= 3; /* XXX: adhoc value */
1748 u_int32_t randid
[2];
1749 time_t vltime0
, pltime0
;
1751 bzero(&ifra
, sizeof(ifra
));
1752 strncpy(ifra
.ifra_name
, if_name(ifp
), sizeof(ifra
.ifra_name
));
1753 ifra
.ifra_addr
= ia0
->ia_addr
;
1754 /* copy prefix mask */
1755 ifra
.ifra_prefixmask
= ia0
->ia_prefixmask
;
1756 /* clear the old IFID */
1757 for (i
= 0; i
< 4; i
++) {
1758 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[i
]
1759 &= ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[i
];
1763 in6_get_tmpifid(ifp
, (u_int8_t
*)randid
,
1764 (const u_int8_t
*)&ia0
->ia_addr
.sin6_addr
.s6_addr
[8],
1766 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[2]
1767 |= (randid
[0] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[2]));
1768 ifra
.ifra_addr
.sin6_addr
.s6_addr32
[3]
1769 |= (randid
[1] & ~(ifra
.ifra_prefixmask
.sin6_addr
.s6_addr32
[3]));
1772 * If by chance the new temporary address is the same as an address
1773 * already assigned to the interface, generate a new randomized
1774 * interface identifier and repeat this step.
1777 if (in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
) != NULL
) {
1778 if (trylimit
-- == 0) {
1779 nd6log((LOG_NOTICE
, "in6_tmpifadd: failed to find "
1780 "a unique random IFID\n"));
1788 * The Valid Lifetime is the lower of the Valid Lifetime of the
1789 * public address or TEMP_VALID_LIFETIME.
1790 * The Preferred Lifetime is the lower of the Preferred Lifetime
1791 * of the public address or TEMP_PREFERRED_LIFETIME -
1794 if (ia0
->ia6_lifetime
.ia6t_expire
!= 0) {
1795 vltime0
= IFA6_IS_INVALID(ia0
) ? 0 :
1796 (ia0
->ia6_lifetime
.ia6t_expire
- time_second
);
1797 if (vltime0
> ip6_temp_valid_lifetime
)
1798 vltime0
= ip6_temp_valid_lifetime
;
1800 vltime0
= ip6_temp_valid_lifetime
;
1801 if (ia0
->ia6_lifetime
.ia6t_preferred
!= 0) {
1802 pltime0
= IFA6_IS_DEPRECATED(ia0
) ? 0 :
1803 (ia0
->ia6_lifetime
.ia6t_preferred
- time_second
);
1804 if (pltime0
> ip6_temp_preferred_lifetime
- ip6_desync_factor
) {
1805 pltime0
= ip6_temp_preferred_lifetime
-
1809 pltime0
= ip6_temp_preferred_lifetime
- ip6_desync_factor
;
1810 ifra
.ifra_lifetime
.ia6t_vltime
= vltime0
;
1811 ifra
.ifra_lifetime
.ia6t_pltime
= pltime0
;
1814 * A temporary address is created only if this calculated Preferred
1815 * Lifetime is greater than REGEN_ADVANCE time units.
1817 if (ifra
.ifra_lifetime
.ia6t_pltime
<= ip6_temp_regen_advance
)
1820 /* XXX: scope zone ID? */
1822 ifra
.ifra_flags
|= (IN6_IFF_AUTOCONF
|IN6_IFF_TEMPORARY
);
1824 /* allocate ifaddr structure, link into chain, etc. */
1825 if ((error
= in6_update_ifa(ifp
, &ifra
, NULL
)) != 0)
1828 newia
= in6ifa_ifpwithaddr(ifp
, &ifra
.ifra_addr
.sin6_addr
);
1829 if (newia
== NULL
) { /* XXX: can it happen? */
1831 "in6_tmpifadd: ifa update succeeded, but we got "
1833 return (EINVAL
); /* XXX */
1835 newia
->ia6_ndpr
= ia0
->ia6_ndpr
;
1836 newia
->ia6_ndpr
->ndpr_refcnt
++;
1842 in6_init_prefix_ltimes(struct nd_prefix
*ndpr
)
1844 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */
1845 if (ndpr
->ndpr_pltime
> ndpr
->ndpr_vltime
) {
1846 nd6log((LOG_INFO
, "in6_init_prefix_ltimes: preferred lifetime"
1847 "(%d) is greater than valid lifetime(%d)\n",
1848 (u_int
)ndpr
->ndpr_pltime
, (u_int
)ndpr
->ndpr_vltime
));
1851 if (ndpr
->ndpr_pltime
== ND6_INFINITE_LIFETIME
)
1852 ndpr
->ndpr_preferred
= 0;
1854 ndpr
->ndpr_preferred
= time_second
+ ndpr
->ndpr_pltime
;
1855 if (ndpr
->ndpr_vltime
== ND6_INFINITE_LIFETIME
)
1856 ndpr
->ndpr_expire
= 0;
1858 ndpr
->ndpr_expire
= time_second
+ ndpr
->ndpr_vltime
;
1864 in6_init_address_ltimes(struct nd_prefix
*new, struct in6_addrlifetime
*lt6
)
1866 /* init ia6t_expire */
1867 if (lt6
->ia6t_vltime
== ND6_INFINITE_LIFETIME
)
1868 lt6
->ia6t_expire
= 0;
1870 lt6
->ia6t_expire
= time_second
;
1871 lt6
->ia6t_expire
+= lt6
->ia6t_vltime
;
1874 /* init ia6t_preferred */
1875 if (lt6
->ia6t_pltime
== ND6_INFINITE_LIFETIME
)
1876 lt6
->ia6t_preferred
= 0;
1878 lt6
->ia6t_preferred
= time_second
;
1879 lt6
->ia6t_preferred
+= lt6
->ia6t_pltime
;
1884 * Delete all the routing table entries that use the specified gateway.
1885 * XXX: this function causes search through all entries of routing table, so
1886 * it shouldn't be called when acting as a router.
1889 rt6_flush(struct in6_addr
*gateway
, struct ifnet
*ifp
)
1891 struct radix_node_head
*rnh
= rt_tables
[mycpuid
][AF_INET6
];
1895 /* We'll care only link-local addresses */
1896 if (!IN6_IS_ADDR_LINKLOCAL(gateway
)) {
1900 /* XXX: hack for KAME's link-local address kludge */
1901 gateway
->s6_addr16
[1] = htons(ifp
->if_index
);
1903 rnh
->rnh_walktree(rnh
, rt6_deleteroute
, (void *)gateway
);
1908 rt6_deleteroute(struct radix_node
*rn
, void *arg
)
1910 #define SIN6(s) ((struct sockaddr_in6 *)s)
1911 struct rtentry
*rt
= (struct rtentry
*)rn
;
1912 struct in6_addr
*gate
= (struct in6_addr
*)arg
;
1914 if (rt
->rt_gateway
== NULL
|| rt
->rt_gateway
->sa_family
!= AF_INET6
)
1917 if (!IN6_ARE_ADDR_EQUAL(gate
, &SIN6(rt
->rt_gateway
)->sin6_addr
))
1921 * Do not delete a static route.
1922 * XXX: this seems to be a bit ad-hoc. Should we consider the
1923 * 'cloned' bit instead?
1925 if (rt
->rt_flags
& RTF_STATIC
)
1929 * We delete only host route. This means, in particular, we don't
1930 * delete default route.
1932 if (!(rt
->rt_flags
& RTF_HOST
))
1935 return (rtrequest(RTM_DELETE
, rt_key(rt
),
1936 rt
->rt_gateway
, rt_mask(rt
), rt
->rt_flags
, 0));
1941 nd6_setdefaultiface(int ifindex
)
1945 if (ifindex
< 0 || if_index
< ifindex
)
1948 if (nd6_defifindex
!= ifindex
) {
1949 nd6_defifindex
= ifindex
;
1950 if (nd6_defifindex
> 0)
1951 nd6_defifp
= ifindex2ifnet
[nd6_defifindex
];
1956 * If the Default Router List is empty, install a route
1957 * to the specified interface as default or remove the default
1958 * route when the default interface becomes canceled.
1959 * The check for the queue is actually redundant, but
1960 * we do this here to avoid re-install the default route
1961 * if the list is NOT empty.
1963 if (TAILQ_FIRST(&nd_defrouter
) == NULL
)
1967 * Our current implementation assumes one-to-one maping between
1968 * interfaces and links, so it would be natural to use the
1969 * default interface as the default link.
1971 scope6_setdefault(nd6_defifp
);