1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.6 2003/01/23 21:06:47 sam Exp $ */
2 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
35 #include "opt_ipsec.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/kernel.h>
46 #include <sys/errno.h>
47 #include <sys/syslog.h>
48 #include <sys/queue.h>
49 #include <sys/callout.h>
50 #include <sys/mutex.h>
52 #include <sys/thread2.h>
53 #include <sys/mutex2.h>
56 #include <net/if_types.h>
57 #include <net/if_dl.h>
58 #include <net/route.h>
59 #include <net/netisr2.h>
60 #include <net/netmsg2.h>
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet6/in6_var.h>
65 #include <netinet/ip6.h>
66 #include <netinet6/ip6_var.h>
67 #include <netinet6/nd6.h>
68 #include <netinet/icmp6.h>
71 #include <netinet6/ipsec.h>
73 #include <netinet6/ipsec6.h>
77 #include <net/net_osdep.h>
80 #include <netinet/ip_carp.h>
84 #define SDL(s) ((struct sockaddr_dl *)s)
87 static struct dadq
*nd6_dad_find(struct ifaddr
*);
88 static void nd6_dad_starttimer(struct dadq
*, int);
89 static void nd6_dad_stoptimer(struct dadq
*);
90 static void nd6_dad_timer(void *);
91 static void nd6_dad_timer_handler(netmsg_t
);
92 static void nd6_dad_ns_output(struct dadq
*);
93 static void nd6_dad_ns_input(struct ifaddr
*);
94 static void nd6_dad_na_input(struct ifaddr
*);
95 static struct dadq
*nd6_dad_create(struct ifaddr
*);
96 static void nd6_dad_destroy(struct dadq
*);
97 static void nd6_dad_duplicated(struct ifaddr
*);
99 static int dad_ignore_ns
= 0; /* ignore NS in DAD - specwise incorrect*/
100 static int dad_maxtry
= 15; /* max # of *tries* to transmit DAD packet */
103 * Input an Neighbor Solicitation Message.
106 * Based on RFC 2462 (duplicated address detection)
109 nd6_ns_input(struct mbuf
*m
, int off
, int icmp6len
)
111 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
112 struct ifnet
*cmpifp
;
113 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
114 struct nd_neighbor_solicit
*nd_ns
;
115 struct in6_addr saddr6
= ip6
->ip6_src
;
116 struct in6_addr daddr6
= ip6
->ip6_dst
;
117 struct in6_addr taddr6
;
118 struct in6_addr myaddr6
;
120 struct ifaddr
*ifa
= NULL
;
122 int anycast
= 0, proxy
= 0, tentative
= 0;
124 union nd_opts ndopts
;
125 struct sockaddr_dl
*proxydl
= NULL
;
128 * Collapse interfaces to the bridge for comparison and
129 * mac (llinfo) purposes.
133 cmpifp
= ifp
->if_bridge
;
135 #ifndef PULLDOWN_TEST
136 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
137 nd_ns
= (struct nd_neighbor_solicit
*)((caddr_t
)ip6
+ off
);
139 IP6_EXTHDR_GET(nd_ns
, struct nd_neighbor_solicit
*, m
, off
, icmp6len
);
141 icmp6stat
.icp6s_tooshort
++;
145 ip6
= mtod(m
, struct ip6_hdr
*); /* adjust pointer for safety */
146 taddr6
= nd_ns
->nd_ns_target
;
148 if (ip6
->ip6_hlim
!= 255) {
150 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
151 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
152 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
156 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
)) {
157 /* dst has to be solicited node multicast address. */
158 if (daddr6
.s6_addr16
[0] == IPV6_ADDR_INT16_MLL
&&
159 /* don't check ifindex portion */
160 daddr6
.s6_addr32
[1] == 0 &&
161 daddr6
.s6_addr32
[2] == IPV6_ADDR_INT32_ONE
&&
162 daddr6
.s6_addr8
[12] == 0xff) {
165 nd6log((LOG_INFO
, "nd6_ns_input: bad DAD packet "
166 "(wrong ip6 dst)\n"));
169 } else if (!nd6_onlink_ns_rfc4861
) {
171 * Make sure the source address is from a neighbor's address.
173 * XXX probably only need to check cmpifp.
175 if (in6ifa_ifplocaladdr(cmpifp
, &saddr6
) == NULL
&&
176 in6ifa_ifplocaladdr(ifp
, &saddr6
) == NULL
) {
177 nd6log((LOG_INFO
, "nd6_ns_input: "
178 "NS packet from non-neighbor\n"));
183 if (IN6_IS_ADDR_MULTICAST(&taddr6
)) {
184 nd6log((LOG_INFO
, "nd6_ns_input: bad NS target (multicast)\n"));
188 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6
))
189 taddr6
.s6_addr16
[1] = htons(ifp
->if_index
);
191 icmp6len
-= sizeof(*nd_ns
);
192 nd6_option_init(nd_ns
+ 1, icmp6len
, &ndopts
);
193 if (nd6_options(&ndopts
) < 0) {
195 "nd6_ns_input: invalid ND option, ignored\n"));
196 /* nd6_options have incremented stats */
200 if (ndopts
.nd_opts_src_lladdr
) {
201 lladdr
= (char *)(ndopts
.nd_opts_src_lladdr
+ 1);
202 lladdrlen
= ndopts
.nd_opts_src_lladdr
->nd_opt_len
<< 3;
205 if (IN6_IS_ADDR_UNSPECIFIED(&ip6
->ip6_src
) && lladdr
) {
206 nd6log((LOG_INFO
, "nd6_ns_input: bad DAD packet "
207 "(link-layer address option)\n"));
212 * Attaching target link-layer address to the NA?
215 * NS IP dst is unicast/anycast MUST NOT add
216 * NS IP dst is solicited-node multicast MUST add
218 * In implementation, we add target link-layer address by default.
219 * We do not add one in MUST NOT cases.
221 #if 0 /* too much! */
222 ifa
= (struct ifaddr
*)in6ifa_ifpwithaddr(ifp
, &daddr6
);
223 if (ifa
&& (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_ANYCAST
))
227 if (!IN6_IS_ADDR_MULTICAST(&daddr6
))
233 * Target address (taddr6) must be either:
234 * (1) Valid unicast/anycast address for my receiving interface.
235 * (2) Unicast or anycast address for which I'm offering proxy
237 * (3) "tentative" address on which DAD is being performed.
239 /* (1) and (3) check. */
242 ifa
= carp_iamatch6(ifp
->if_carp
, &taddr6
);
244 ifa
= (struct ifaddr
*)in6ifa_ifpwithaddr(ifp
, &taddr6
);
246 ifa
= (struct ifaddr
*)in6ifa_ifpwithaddr(ifp
, &taddr6
);
250 * (2) Check proxying. Requires ip6_forwarding to be turned on.
252 * If the packet is anycast the target route must be on a
253 * different interface because the anycast will get anything
254 * on the current interface.
256 * If the packet is unicast the target route may be on the
257 * same interface. If the gateway is a (typically manually
258 * configured) link address we can directly offer it.
259 * XXX for now we don't do this but instead offer ours and
262 * WARNING! Since this is a subnet proxy the interface proxying
263 * the ND6 must be in promiscuous mode or it will not see the
264 * solicited multicast requests for various hosts being proxied.
266 * WARNING! Since this is a subnet proxy we have to treat bridge
267 * interfaces as being the bridge itself so we do not proxy-nd6
268 * between bridge interfaces (which are effectively switched).
270 * (In the specific-host-proxy case via RTF_ANNOUNCE, which is
271 * a bitch to configure, a specific multicast route is already
272 * added for that host <-- NOT RECOMMENDED).
274 if (!ifa
&& ip6_forwarding
) {
276 struct sockaddr_in6 tsin6
;
279 bzero(&tsin6
, sizeof tsin6
);
280 tsin6
.sin6_len
= sizeof(struct sockaddr_in6
);
281 tsin6
.sin6_family
= AF_INET6
;
282 tsin6
.sin6_addr
= taddr6
;
284 rt
= rtpurelookup((struct sockaddr
*)&tsin6
);
285 rtifp
= rt
? rt
->rt_ifp
: NULL
;
286 if (rtifp
&& rtifp
->if_bridge
)
287 rtifp
= rtifp
->if_bridge
;
290 (cmpifp
!= rtifp
|| (m
->m_flags
& M_MCAST
) == 0)) {
291 ifa
= (struct ifaddr
*)in6ifa_ifpforlinklocal(cmpifp
,
292 IN6_IFF_NOTREADY
|IN6_IFF_ANYCAST
);
294 "nd6_ns_input: nd6 proxy %s(%s)<-%s ifa %p\n",
295 if_name(cmpifp
), if_name(ifp
),
296 if_name(rtifp
), ifa
));
300 * Manual link address on same interface
301 * w/announce flag will proxy-arp using
302 * target mac, else our mac is used.
304 if (cmpifp
== rtifp
&&
305 (rt
->rt_flags
& RTF_ANNOUNCE
) &&
306 rt
->rt_gateway
->sa_family
== AF_LINK
) {
307 proxydl
= SDL(rt
->rt_gateway
);
316 * We've got an NS packet, and we don't have that adddress
317 * assigned for us. We MUST silently ignore it.
322 myaddr6
= *IFA_IN6(ifa
);
323 anycast
= ((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_ANYCAST
;
324 tentative
= ((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_TENTATIVE
;
325 if (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_DUPLICATED
)
328 if (lladdr
&& ((cmpifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
329 nd6log((LOG_INFO
, "nd6_ns_input: lladdrlen mismatch for %s "
330 "(if %d, NS packet %d)\n",
331 ip6_sprintf(&taddr6
), cmpifp
->if_addrlen
, lladdrlen
- 2));
335 if (IN6_ARE_ADDR_EQUAL(&myaddr6
, &saddr6
)) {
336 nd6log((LOG_INFO
, "nd6_ns_input: duplicate IP6 address %s\n",
337 ip6_sprintf(&saddr6
)));
342 * We have neighbor solicitation packet, with target address equals to
343 * one of my tentative address.
345 * src addr how to process?
347 * multicast of course, invalid (rejected in ip6_input)
348 * unicast somebody is doing address resolution -> ignore
349 * unspec dup address detection
351 * The processing is defined in RFC 2462.
355 * If source address is unspecified address, it is for
356 * duplicated address detection.
358 * If not, the packet is for addess resolution;
359 * silently ignore it.
361 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
))
362 nd6_dad_ns_input(ifa
);
368 * If the source address is unspecified address, entries must not
369 * be created or updated.
370 * It looks that sender is performing DAD. Output NA toward
371 * all-node multicast address, to tell the sender that I'm using
373 * S bit ("solicited") must be zero.
375 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6
)) {
376 saddr6
= kin6addr_linklocal_allnodes
;
377 saddr6
.s6_addr16
[1] = htons(cmpifp
->if_index
);
378 nd6_na_output(cmpifp
, &saddr6
, &taddr6
,
379 ((anycast
|| proxy
|| !tlladdr
) ? 0 : ND_NA_FLAG_OVERRIDE
) |
380 (ip6_forwarding
? ND_NA_FLAG_ROUTER
: 0),
381 tlladdr
, (struct sockaddr
*)proxydl
);
385 nd6_cache_lladdr(cmpifp
, &saddr6
, lladdr
, lladdrlen
,
386 ND_NEIGHBOR_SOLICIT
, 0);
388 nd6_na_output(ifp
, &saddr6
, &taddr6
,
389 ((anycast
|| proxy
|| !tlladdr
) ? 0 : ND_NA_FLAG_OVERRIDE
) |
390 (ip6_forwarding
? ND_NA_FLAG_ROUTER
: 0) | ND_NA_FLAG_SOLICITED
,
391 tlladdr
, (struct sockaddr
*)proxydl
);
397 nd6log((LOG_ERR
, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6
)));
398 nd6log((LOG_ERR
, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6
)));
399 nd6log((LOG_ERR
, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6
)));
400 icmp6stat
.icp6s_badns
++;
405 * Output an Neighbor Solicitation Message. Caller specifies:
406 * - ICMP6 header source IP6 address
407 * - ND6 header target IP6 address
408 * - ND6 header source datalink address
411 * Based on RFC 2462 (duplicated address detection)
414 nd6_ns_output(struct ifnet
*ifp
, const struct in6_addr
*daddr6
,
415 const struct in6_addr
*taddr6
,
416 struct llinfo_nd6
*ln
, /* for source address determination */
417 int dad
) /* duplicated address detection */
421 struct nd_neighbor_solicit
*nd_ns
;
422 struct in6_ifaddr
*ia
= NULL
;
423 struct ip6_moptions im6o
;
427 struct ifnet
*outif
= NULL
;
429 if (IN6_IS_ADDR_MULTICAST(taddr6
))
432 /* estimate the size of message */
433 maxlen
= sizeof(*ip6
) + sizeof(*nd_ns
);
434 maxlen
+= (sizeof(struct nd_opt_hdr
) + ifp
->if_addrlen
+ 7) & ~7;
435 if (max_linkhdr
+ maxlen
> MCLBYTES
) {
437 kprintf("nd6_ns_output: max_linkhdr + maxlen > MCLBYTES "
438 "(%d + %d > %d)\n", max_linkhdr
, maxlen
, MCLBYTES
);
443 m
= m_getb(max_linkhdr
+ maxlen
, M_NOWAIT
, MT_DATA
, M_PKTHDR
);
447 if (daddr6
== NULL
|| IN6_IS_ADDR_MULTICAST(daddr6
)) {
448 m
->m_flags
|= M_MCAST
;
449 im6o
.im6o_multicast_ifp
= ifp
;
450 im6o
.im6o_multicast_hlim
= 255;
451 im6o
.im6o_multicast_loop
= 0;
454 icmp6len
= sizeof(*nd_ns
);
455 m
->m_pkthdr
.len
= m
->m_len
= sizeof(*ip6
) + icmp6len
;
456 m
->m_data
+= max_linkhdr
; /* or MH_ALIGN() equivalent? */
458 /* fill neighbor solicitation packet */
459 ip6
= mtod(m
, struct ip6_hdr
*);
461 ip6
->ip6_vfc
&= ~IPV6_VERSION_MASK
;
462 ip6
->ip6_vfc
|= IPV6_VERSION
;
463 /* ip6->ip6_plen will be set later */
464 ip6
->ip6_nxt
= IPPROTO_ICMPV6
;
467 ip6
->ip6_dst
= *daddr6
;
469 ip6
->ip6_dst
.s6_addr16
[0] = IPV6_ADDR_INT16_MLL
;
470 ip6
->ip6_dst
.s6_addr16
[1] = htons(ifp
->if_index
);
471 ip6
->ip6_dst
.s6_addr32
[1] = 0;
472 ip6
->ip6_dst
.s6_addr32
[2] = IPV6_ADDR_INT32_ONE
;
473 ip6
->ip6_dst
.s6_addr32
[3] = taddr6
->s6_addr32
[3];
474 ip6
->ip6_dst
.s6_addr8
[12] = 0xff;
479 * "If the source address of the packet prompting the
480 * solicitation is the same as one of the addresses assigned
481 * to the outgoing interface, that address SHOULD be placed
482 * in the IP Source Address of the outgoing solicitation.
483 * Otherwise, any one of the addresses assigned to the
484 * interface should be used."
486 * We use the source address for the prompting packet
488 * - saddr6 is given from the caller (by giving "ln"), and
489 * - saddr6 belongs to the outgoing interface.
490 * Otherwise, we perform a scope-wise match.
492 struct ip6_hdr
*hip6
; /* hold ip6 */
493 struct in6_addr
*saddr6
;
495 if (ln
&& ln
->ln_hold
) {
496 hip6
= mtod(ln
->ln_hold
, struct ip6_hdr
*);
498 if (sizeof(*hip6
) < ln
->ln_hold
->m_len
)
499 saddr6
= &hip6
->ip6_src
;
504 if (saddr6
&& in6ifa_ifpwithaddr(ifp
, saddr6
))
505 bcopy(saddr6
, &ip6
->ip6_src
, sizeof(*saddr6
));
507 ia
= in6_ifawithifp(ifp
, &ip6
->ip6_dst
);
512 ip6
->ip6_src
= ia
->ia_addr
.sin6_addr
;
516 * Source address for DAD packet must always be IPv6
517 * unspecified address. (0::0)
519 bzero(&ip6
->ip6_src
, sizeof(ip6
->ip6_src
));
521 nd_ns
= (struct nd_neighbor_solicit
*)(ip6
+ 1);
522 nd_ns
->nd_ns_type
= ND_NEIGHBOR_SOLICIT
;
523 nd_ns
->nd_ns_code
= 0;
524 nd_ns
->nd_ns_reserved
= 0;
525 nd_ns
->nd_ns_target
= *taddr6
;
526 in6_clearscope(&nd_ns
->nd_ns_target
); /* XXX */
529 * Add source link-layer address option.
531 * spec implementation
533 * DAD packet MUST NOT do not add the option
534 * there's no link layer address:
535 * impossible do not add the option
536 * there's link layer address:
537 * Multicast NS MUST add one add the option
538 * Unicast NS SHOULD add one add the option
540 if (!dad
&& (mac
= nd6_ifptomac(ifp
))) {
541 int optlen
= sizeof(struct nd_opt_hdr
) + ifp
->if_addrlen
;
542 struct nd_opt_hdr
*nd_opt
= (struct nd_opt_hdr
*)(nd_ns
+ 1);
543 /* 8 byte alignments... */
544 optlen
= (optlen
+ 7) & ~7;
546 m
->m_pkthdr
.len
+= optlen
;
549 bzero((caddr_t
)nd_opt
, optlen
);
550 nd_opt
->nd_opt_type
= ND_OPT_SOURCE_LINKADDR
;
551 nd_opt
->nd_opt_len
= optlen
>> 3;
552 bcopy(mac
, (caddr_t
)(nd_opt
+ 1), ifp
->if_addrlen
);
555 ip6
->ip6_plen
= htons((u_short
)icmp6len
);
556 nd_ns
->nd_ns_cksum
= 0;
558 in6_cksum(m
, IPPROTO_ICMPV6
, sizeof(*ip6
), icmp6len
);
560 ip6_output(m
, NULL
, NULL
, dad
? IPV6_DADOUTPUT
: 0, &im6o
, &outif
, NULL
);
562 icmp6_ifstat_inc(outif
, ifs6_out_msg
);
563 icmp6_ifstat_inc(outif
, ifs6_out_neighborsolicit
);
565 icmp6stat
.icp6s_outhist
[ND_NEIGHBOR_SOLICIT
]++;
569 * Neighbor advertisement input handling.
572 * Based on RFC 2462 (duplicated address detection)
574 * the following items are not implemented yet:
575 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
576 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
579 nd6_na_input(struct mbuf
*m
, int off
, int icmp6len
)
581 struct ifnet
*ifp
= m
->m_pkthdr
.rcvif
;
582 struct ip6_hdr
*ip6
= mtod(m
, struct ip6_hdr
*);
583 struct nd_neighbor_advert
*nd_na
;
584 struct in6_addr saddr6
= ip6
->ip6_src
;
585 struct in6_addr daddr6
= ip6
->ip6_dst
;
586 struct in6_addr taddr6
;
594 struct llinfo_nd6
*ln
;
596 struct sockaddr_dl
*sdl
;
597 union nd_opts ndopts
;
599 if (ip6
->ip6_hlim
!= 255) {
601 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
602 ip6
->ip6_hlim
, ip6_sprintf(&ip6
->ip6_src
),
603 ip6_sprintf(&ip6
->ip6_dst
), if_name(ifp
)));
607 #ifndef PULLDOWN_TEST
608 IP6_EXTHDR_CHECK(m
, off
, icmp6len
,);
609 nd_na
= (struct nd_neighbor_advert
*)((caddr_t
)ip6
+ off
);
611 IP6_EXTHDR_GET(nd_na
, struct nd_neighbor_advert
*, m
, off
, icmp6len
);
613 icmp6stat
.icp6s_tooshort
++;
617 taddr6
= nd_na
->nd_na_target
;
618 flags
= nd_na
->nd_na_flags_reserved
;
619 is_router
= ((flags
& ND_NA_FLAG_ROUTER
) != 0);
620 is_solicited
= ((flags
& ND_NA_FLAG_SOLICITED
) != 0);
621 is_override
= ((flags
& ND_NA_FLAG_OVERRIDE
) != 0);
623 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6
))
624 taddr6
.s6_addr16
[1] = htons(ifp
->if_index
);
626 if (IN6_IS_ADDR_MULTICAST(&taddr6
)) {
628 "nd6_na_input: invalid target address %s\n",
629 ip6_sprintf(&taddr6
)));
632 if (IN6_IS_ADDR_MULTICAST(&daddr6
))
635 "nd6_na_input: a solicited adv is multicasted\n"));
639 icmp6len
-= sizeof(*nd_na
);
640 nd6_option_init(nd_na
+ 1, icmp6len
, &ndopts
);
641 if (nd6_options(&ndopts
) < 0) {
643 "nd6_na_input: invalid ND option, ignored\n"));
644 /* nd6_options have incremented stats */
648 if (ndopts
.nd_opts_tgt_lladdr
) {
649 lladdr
= (char *)(ndopts
.nd_opts_tgt_lladdr
+ 1);
650 lladdrlen
= ndopts
.nd_opts_tgt_lladdr
->nd_opt_len
<< 3;
653 ifa
= (struct ifaddr
*)in6ifa_ifpwithaddr(ifp
, &taddr6
);
656 * Target address matches one of my interface address.
658 * If my address is tentative, this means that there's somebody
659 * already using the same address as mine. This indicates DAD failure.
660 * This is defined in RFC 2462.
662 * Otherwise, process as defined in RFC 2461.
665 && (((struct in6_ifaddr
*)ifa
)->ia6_flags
& IN6_IFF_TENTATIVE
)) {
666 nd6_dad_na_input(ifa
);
670 /* Just for safety, maybe unnecessary. */
673 "nd6_na_input: duplicate IP6 address %s\n",
674 ip6_sprintf(&taddr6
));
678 if (!nd6_onlink_ns_rfc4861
) {
680 * Make sure the source address is from a neighbor's address.
682 if (in6ifa_ifplocaladdr(ifp
, &saddr6
) == NULL
) {
683 nd6log((LOG_INFO
, "nd6_na_input: "
684 "NA packet from non-neighbor\n"));
689 if (lladdr
&& ((ifp
->if_addrlen
+ 2 + 7) & ~7) != lladdrlen
) {
690 nd6log((LOG_INFO
, "nd6_na_input: lladdrlen mismatch for %s "
691 "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6
),
692 ifp
->if_addrlen
, lladdrlen
- 2));
697 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
699 rt
= nd6_lookup(&taddr6
, 0, ifp
);
701 ((ln
= (struct llinfo_nd6
*)rt
->rt_llinfo
) == NULL
) ||
702 ((sdl
= SDL(rt
->rt_gateway
)) == NULL
))
705 if (ln
->ln_state
== ND6_LLINFO_INCOMPLETE
) {
707 * If the link-layer has address, and no lladdr option came,
708 * discard the packet.
710 if (ifp
->if_addrlen
&& !lladdr
)
714 * Record link-layer address, and update the state.
716 sdl
->sdl_alen
= ifp
->if_addrlen
;
717 bcopy(lladdr
, LLADDR(sdl
), ifp
->if_addrlen
);
719 ln
->ln_state
= ND6_LLINFO_REACHABLE
;
722 ln
->ln_expire
= time_uptime
+
723 ND_IFINFO(rt
->rt_ifp
)->reachable
;
726 ln
->ln_state
= ND6_LLINFO_STALE
;
727 ln
->ln_expire
= time_uptime
+ nd6_gctimer
;
729 if ((ln
->ln_router
= is_router
) != 0) {
731 * This means a router's state has changed from
732 * non-reachable to probably reachable, and might
733 * affect the status of associated prefixes..
735 pfxlist_onlink_check();
741 * Check if the link-layer address has changed or not.
747 if (bcmp(lladdr
, LLADDR(sdl
), ifp
->if_addrlen
))
756 * This is VERY complex. Look at it with care.
758 * override solicit lladdr llchange action
763 * 0 0 y y (1) REACHABLE->STALE
764 * 0 1 n -- (2c) *->REACHABLE
765 * 0 1 y n (2b) L *->REACHABLE
766 * 0 1 y y (1) REACHABLE->STALE
769 * 1 0 y y (2a) L *->STALE
770 * 1 1 n -- (2a) *->REACHABLE
771 * 1 1 y n (2a) L *->REACHABLE
772 * 1 1 y y (2a) L *->REACHABLE
774 if (!is_override
&& (lladdr
&& llchange
)) { /* (1) */
776 * If state is REACHABLE, make it STALE.
777 * no other updates should be done.
779 if (ln
->ln_state
== ND6_LLINFO_REACHABLE
) {
780 ln
->ln_state
= ND6_LLINFO_STALE
;
781 ln
->ln_expire
= time_uptime
+ nd6_gctimer
;
784 } else if (is_override
/* (2a) */
785 || (lladdr
&& !llchange
) /* (2b) */
786 || !lladdr
) { /* (2c) */
788 * Update link-local address, if any.
791 sdl
->sdl_alen
= ifp
->if_addrlen
;
792 bcopy(lladdr
, LLADDR(sdl
), ifp
->if_addrlen
);
796 * If solicited, make the state REACHABLE.
797 * If not solicited and the link-layer address was
798 * changed, make it STALE.
801 ln
->ln_state
= ND6_LLINFO_REACHABLE
;
804 ln
->ln_expire
= time_uptime
+
805 ND_IFINFO(ifp
)->reachable
;
808 if (lladdr
&& llchange
) {
809 ln
->ln_state
= ND6_LLINFO_STALE
;
810 ln
->ln_expire
= time_uptime
+ nd6_gctimer
;
815 if (ln
->ln_router
&& !is_router
) {
817 * The peer dropped the router flag.
818 * Remove the sender from the Default Router List and
819 * update the Destination Cache entries.
821 struct nd_defrouter
*dr
;
822 struct in6_addr
*in6
;
824 in6
= &((struct sockaddr_in6
*)rt_key(rt
))->sin6_addr
;
827 * Lock to protect the default router list.
828 * XXX: this might be unnecessary, since this function
829 * is only called under the network software interrupt
830 * context. However, we keep it just for safety.
833 dr
= defrouter_lookup(in6
, rt
->rt_ifp
);
836 mtx_unlock(&nd6_mtx
);
838 if (dr
== NULL
&& !ip6_forwarding
&& ip6_accept_rtadv
) {
840 * Even if the neighbor is not in the default
841 * router list, the neighbor may be used
842 * as a next hop for some destinations
843 * (e.g. redirect case). So we must
844 * call rt6_flush explicitly.
846 rt6_flush(&ip6
->ip6_src
, rt
->rt_ifp
);
849 ln
->ln_router
= is_router
;
851 rt
->rt_flags
&= ~RTF_REJECT
;
855 * we assume ifp is not a loopback here, so just set the 2nd
856 * argument as the 1st one.
858 nd6_output(ifp
, ifp
, ln
->ln_hold
,
859 (struct sockaddr_in6
*)rt_key(rt
), rt
);
868 icmp6stat
.icp6s_badna
++;
873 * Neighbor advertisement output handling.
877 * the following items are not implemented yet:
878 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
879 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
882 nd6_na_output(struct ifnet
*ifp
, const struct in6_addr
*daddr6
,
883 const struct in6_addr
*taddr6
, u_long flags
,
884 int tlladdr
, /* 1 if include target link-layer address */
885 struct sockaddr
*sdl0
) /* sockaddr_dl (= proxy NA) or NULL */
889 struct nd_neighbor_advert
*nd_na
;
890 struct in6_ifaddr
*ia
= NULL
;
891 struct ip6_moptions im6o
;
895 struct ifnet
*outif
= NULL
;
897 /* estimate the size of message */
898 maxlen
= sizeof(*ip6
) + sizeof(*nd_na
);
899 maxlen
+= (sizeof(struct nd_opt_hdr
) + ifp
->if_addrlen
+ 7) & ~7;
900 if (max_linkhdr
+ maxlen
> MCLBYTES
) {
902 kprintf("nd6_na_output: max_linkhdr + maxlen > MCLBYTES "
903 "(%d + %d > %d)\n", max_linkhdr
, maxlen
, MCLBYTES
);
908 m
= m_getb(max_linkhdr
+ maxlen
, M_NOWAIT
, MT_DATA
, M_PKTHDR
);
912 if (IN6_IS_ADDR_MULTICAST(daddr6
)) {
913 m
->m_flags
|= M_MCAST
;
914 im6o
.im6o_multicast_ifp
= ifp
;
915 im6o
.im6o_multicast_hlim
= 255;
916 im6o
.im6o_multicast_loop
= 0;
919 icmp6len
= sizeof(*nd_na
);
920 m
->m_pkthdr
.len
= m
->m_len
= sizeof(struct ip6_hdr
) + icmp6len
;
921 m
->m_data
+= max_linkhdr
; /* or MH_ALIGN() equivalent? */
923 /* fill neighbor advertisement packet */
924 ip6
= mtod(m
, struct ip6_hdr
*);
926 ip6
->ip6_vfc
&= ~IPV6_VERSION_MASK
;
927 ip6
->ip6_vfc
|= IPV6_VERSION
;
928 ip6
->ip6_nxt
= IPPROTO_ICMPV6
;
930 if (IN6_IS_ADDR_UNSPECIFIED(daddr6
)) {
932 ip6
->ip6_dst
.s6_addr16
[0] = IPV6_ADDR_INT16_MLL
;
933 ip6
->ip6_dst
.s6_addr16
[1] = htons(ifp
->if_index
);
934 ip6
->ip6_dst
.s6_addr32
[1] = 0;
935 ip6
->ip6_dst
.s6_addr32
[2] = 0;
936 ip6
->ip6_dst
.s6_addr32
[3] = IPV6_ADDR_INT32_ONE
;
937 flags
&= ~ND_NA_FLAG_SOLICITED
;
939 ip6
->ip6_dst
= *daddr6
;
942 * Select a source whose scope is the same as that of the dest.
944 ia
= in6_ifawithifp(ifp
, &ip6
->ip6_dst
);
949 ip6
->ip6_src
= ia
->ia_addr
.sin6_addr
;
950 nd_na
= (struct nd_neighbor_advert
*)(ip6
+ 1);
951 nd_na
->nd_na_type
= ND_NEIGHBOR_ADVERT
;
952 nd_na
->nd_na_code
= 0;
953 nd_na
->nd_na_target
= *taddr6
;
954 in6_clearscope(&nd_na
->nd_na_target
); /* XXX */
957 * "tlladdr" indicates NS's condition for adding tlladdr or not.
958 * see nd6_ns_input() for details.
959 * Basically, if NS packet is sent to unicast/anycast addr,
960 * target lladdr option SHOULD NOT be included.
965 * sdl0 != NULL indicates proxy NA. If we do proxy, use
966 * lladdr in sdl0. If we are not proxying (sending NA for
967 * my address) use lladdr configured for the interface.
972 mac
= carp_macmatch6(ifp
->if_carp
, m
, taddr6
);
974 mac
= nd6_ifptomac(ifp
);
976 mac
= nd6_ifptomac(ifp
);
978 } else if (sdl0
->sa_family
== AF_LINK
) {
979 struct sockaddr_dl
*sdl
;
980 sdl
= (struct sockaddr_dl
*)sdl0
;
981 if (sdl
->sdl_alen
== ifp
->if_addrlen
)
986 int optlen
= sizeof(struct nd_opt_hdr
) + ifp
->if_addrlen
;
987 struct nd_opt_hdr
*nd_opt
= (struct nd_opt_hdr
*)(nd_na
+ 1);
989 /* roundup to 8 bytes alignment! */
990 optlen
= (optlen
+ 7) & ~7;
992 m
->m_pkthdr
.len
+= optlen
;
995 bzero((caddr_t
)nd_opt
, optlen
);
996 nd_opt
->nd_opt_type
= ND_OPT_TARGET_LINKADDR
;
997 nd_opt
->nd_opt_len
= optlen
>> 3;
998 bcopy(mac
, (caddr_t
)(nd_opt
+ 1), ifp
->if_addrlen
);
1000 flags
&= ~ND_NA_FLAG_OVERRIDE
;
1002 ip6
->ip6_plen
= htons((u_short
)icmp6len
);
1003 nd_na
->nd_na_flags_reserved
= flags
;
1004 nd_na
->nd_na_cksum
= 0;
1005 nd_na
->nd_na_cksum
=
1006 in6_cksum(m
, IPPROTO_ICMPV6
, sizeof(struct ip6_hdr
), icmp6len
);
1008 ip6_output(m
, NULL
, NULL
, 0, &im6o
, &outif
, NULL
);
1010 icmp6_ifstat_inc(outif
, ifs6_out_msg
);
1011 icmp6_ifstat_inc(outif
, ifs6_out_neighboradvert
);
1013 icmp6stat
.icp6s_outhist
[ND_NEIGHBOR_ADVERT
]++;
1017 nd6_ifptomac(struct ifnet
*ifp
)
1019 switch (ifp
->if_type
) {
1025 #ifdef IFT_IEEE80211
1031 return ((caddr_t
)(ifp
+ 1));
1038 struct netmsg_base base
;
1043 TAILQ_ENTRY(dadq
) dad_list
;
1044 struct ifaddr
*dad_ifa
;
1045 int dad_count
; /* max NS to send */
1046 int dad_ns_tcount
; /* # of trials to send NS */
1047 int dad_ns_ocount
; /* NS sent so far */
1050 struct callout dad_timer_ch
;
1051 struct netmsg_dad dad_nmsg
;
1053 TAILQ_HEAD(dadq_head
, dadq
);
1055 static struct dadq_head dadq
= TAILQ_HEAD_INITIALIZER(dadq
);
1057 static struct dadq
*
1058 nd6_dad_find(struct ifaddr
*ifa
)
1064 TAILQ_FOREACH(dp
, &dadq
, dad_list
) {
1065 if (dp
->dad_ifa
== ifa
)
1072 nd6_dad_starttimer(struct dadq
*dp
, int ticks
)
1075 callout_reset(&dp
->dad_timer_ch
, ticks
, nd6_dad_timer
, dp
);
1079 nd6_dad_stoptimer(struct dadq
*dp
)
1082 callout_stop(&dp
->dad_timer_ch
);
1086 * Start Duplicated Address Detection (DAD) for specified interface address.
1089 nd6_dad_start(struct ifaddr
*ifa
,
1090 int *tick
) /* minimum delay ticks for IFF_UP event */
1092 struct in6_ifaddr
*ia
= (struct in6_ifaddr
*)ifa
;
1098 * If we don't need DAD, don't do it.
1099 * There are several cases:
1100 * - DAD is disabled (ip6_dad_count == 0)
1101 * - the interface address is anycast
1103 if (!(ia
->ia6_flags
& IN6_IFF_TENTATIVE
)) {
1105 "nd6_dad_start: called with non-tentative address "
1107 ip6_sprintf(&ia
->ia_addr
.sin6_addr
),
1108 ifa
->ifa_ifp
? if_name(ifa
->ifa_ifp
) : "???");
1111 if (ia
->ia6_flags
& IN6_IFF_ANYCAST
) {
1112 ia
->ia6_flags
&= ~IN6_IFF_TENTATIVE
;
1115 if (!ip6_dad_count
) {
1116 ia
->ia6_flags
&= ~IN6_IFF_TENTATIVE
;
1120 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1121 if (!(ifa
->ifa_ifp
->if_flags
& IFF_UP
))
1123 if (nd6_dad_find(ifa
) != NULL
) {
1124 /* DAD already in progress */
1128 dp
= nd6_dad_create(ifa
);
1129 nd6log((LOG_DEBUG
, "%s: starting DAD for %s\n", if_name(ifa
->ifa_ifp
),
1130 ip6_sprintf(&ia
->ia_addr
.sin6_addr
)));
1133 * Send NS packet for DAD, dp->dad_count times.
1134 * Note that we must delay the first transmission, if this is the
1135 * first packet to be sent from the interface after interface
1136 * (re)initialization.
1139 nd6_dad_ns_output(dp
);
1140 nd6_dad_starttimer(dp
,
1141 ND_IFINFO(ifa
->ifa_ifp
)->retrans
* hz
/ 1000);
1146 ntick
= krandom() % (MAX_RTR_SOLICITATION_DELAY
* hz
);
1148 ntick
= *tick
+ krandom() % (hz
/ 2);
1150 nd6_dad_starttimer(dp
, ntick
);
1155 * Terminate DAD unconditionally. Used for address removals.
1158 nd6_dad_stop(struct ifaddr
*ifa
)
1164 dp
= nd6_dad_find(ifa
);
1166 /* DAD wasn't started yet */
1169 nd6_dad_destroy(dp
);
1172 static struct dadq
*
1173 nd6_dad_create(struct ifaddr
*ifa
)
1175 struct netmsg_dad
*dm
;
1180 dp
= kmalloc(sizeof(*dp
), M_IP6NDP
, M_INTWAIT
| M_ZERO
);
1181 callout_init_mp(&dp
->dad_timer_ch
);
1184 netmsg_init(&dm
->base
, NULL
, &netisr_adone_rport
,
1185 MSGF_DROPABLE
| MSGF_PRIORITY
, nd6_dad_timer_handler
);
1189 IFAREF(ifa
); /* just for safety */
1191 /* Send NS packet for DAD, ip6_dad_count times. */
1192 dp
->dad_count
= ip6_dad_count
;
1194 TAILQ_INSERT_TAIL(&dadq
, dp
, dad_list
);
1200 nd6_dad_destroy(struct dadq
*dp
)
1202 struct lwkt_msg
*lmsg
= &dp
->dad_nmsg
.base
.lmsg
;
1206 TAILQ_REMOVE(&dadq
, dp
, dad_list
);
1208 nd6_dad_stoptimer(dp
);
1211 if ((lmsg
->ms_flags
& MSGF_DONE
) == 0)
1215 IFAFREE(dp
->dad_ifa
);
1216 kfree(dp
, M_IP6NDP
);
1220 nd6_dad_timer(void *xdp
)
1222 struct dadq
*dp
= xdp
;
1223 struct lwkt_msg
*lmsg
= &dp
->dad_nmsg
.base
.lmsg
;
1225 KASSERT(mycpuid
== 0, ("dad timer not on cpu0"));
1228 if (lmsg
->ms_flags
& MSGF_DONE
)
1229 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg
);
1234 nd6_dad_timer_handler(netmsg_t msg
)
1236 struct netmsg_dad
*dm
= (struct netmsg_dad
*)msg
;
1237 struct dadq
*dp
= dm
->dadq
;
1238 struct ifaddr
*ifa
= dp
->dad_ifa
;
1239 struct in6_ifaddr
*ia
= (struct in6_ifaddr
*)ifa
;
1245 lwkt_replymsg(&dm
->base
.lmsg
, 0);
1248 if (ia
->ia6_flags
& IN6_IFF_DUPLICATED
) {
1249 log(LOG_ERR
, "nd6_dad_timer: called with duplicated address "
1251 ip6_sprintf(&ia
->ia_addr
.sin6_addr
),
1252 ifa
->ifa_ifp
? if_name(ifa
->ifa_ifp
) : "???");
1255 if (!(ia
->ia6_flags
& IN6_IFF_TENTATIVE
)) {
1256 log(LOG_ERR
, "nd6_dad_timer: called with non-tentative address "
1258 ip6_sprintf(&ia
->ia_addr
.sin6_addr
),
1259 ifa
->ifa_ifp
? if_name(ifa
->ifa_ifp
) : "???");
1263 /* Timed out with IFF_{RUNNING,UP} check */
1264 if (dp
->dad_ns_tcount
> dad_maxtry
) {
1265 nd6log((LOG_INFO
, "%s: could not run DAD, driver problem?\n",
1266 if_name(ifa
->ifa_ifp
)));
1270 /* Need more checks? */
1271 if (dp
->dad_ns_ocount
< dp
->dad_count
) {
1273 * We have more NS to go. Send NS packet for DAD.
1275 nd6_dad_ns_output(dp
);
1276 nd6_dad_starttimer(dp
,
1277 ND_IFINFO(ifa
->ifa_ifp
)->retrans
* hz
/ 1000);
1280 * We have transmitted sufficient number of DAD packets.
1281 * See what we've got.
1287 if (dp
->dad_na_icount
) {
1289 * the check is in nd6_dad_na_input(),
1295 if (dp
->dad_ns_icount
) {
1296 #if 0 /* heuristics */
1299 * - we have sent many(?) DAD NS, and
1300 * - the number of NS we sent equals to the
1301 * number of NS we've got, and
1303 * we may have a faulty network card/driver which
1304 * loops back multicasts to myself.
1306 if (3 < dp
->dad_count
1307 && dp
->dad_ns_icount
== dp
->dad_count
1308 && dp
->dad_na_icount
== 0) {
1309 log(LOG_INFO
, "DAD questionable for %s(%s): "
1310 "network card loops back multicast?\n",
1311 ip6_sprintf(&ia
->ia_addr
.sin6_addr
),
1312 if_name(ifa
->ifa_ifp
));
1313 /* XXX consider it a duplicate or not? */
1316 /* We've seen NS, means DAD has failed. */
1320 /* We've seen NS, means DAD has failed. */
1326 /* dp will be freed in nd6_dad_duplicated() */
1328 nd6_dad_duplicated(ifa
);
1331 * We are done with DAD. No NA came, no NS came.
1332 * duplicated address found.
1334 ia
->ia6_flags
&= ~IN6_IFF_TENTATIVE
;
1336 "%s: DAD complete for %s - no duplicates found\n",
1337 if_name(ifa
->ifa_ifp
),
1338 ip6_sprintf(&ia
->ia_addr
.sin6_addr
)));
1344 nd6_dad_destroy(dp
);
1348 nd6_dad_duplicated(struct ifaddr
*ifa
)
1350 struct in6_ifaddr
*ia
= (struct in6_ifaddr
*)ifa
;
1355 dp
= nd6_dad_find(ifa
);
1357 log(LOG_ERR
, "nd6_dad_duplicated: DAD structure not found\n");
1362 * We are done with DAD, with duplicated address found. (failure)
1364 log(LOG_ERR
, "%s: DAD detected duplicate IPv6 address %s: "
1365 "NS in/out=%d/%d, NA in=%d\n",
1366 if_name(ifa
->ifa_ifp
), ip6_sprintf(&ia
->ia_addr
.sin6_addr
),
1367 dp
->dad_ns_icount
, dp
->dad_ns_ocount
, dp
->dad_na_icount
);
1369 ia
->ia6_flags
&= ~IN6_IFF_TENTATIVE
;
1370 ia
->ia6_flags
|= IN6_IFF_DUPLICATED
;
1372 log(LOG_ERR
, "%s: DAD complete for %s - duplicate found\n",
1373 if_name(ifa
->ifa_ifp
), ip6_sprintf(&ia
->ia_addr
.sin6_addr
));
1374 log(LOG_ERR
, "%s: manual intervention required\n",
1375 if_name(ifa
->ifa_ifp
));
1377 nd6_dad_destroy(dp
);
1381 nd6_dad_ns_output(struct dadq
*dp
)
1383 struct in6_ifaddr
*ia
= (struct in6_ifaddr
*)dp
->dad_ifa
;
1384 struct ifnet
*ifp
= dp
->dad_ifa
->ifa_ifp
;
1388 dp
->dad_ns_tcount
++;
1389 if (!(ifp
->if_flags
& IFF_UP
)) {
1391 kprintf("%s: interface down?\n", if_name(ifp
));
1395 if (!(ifp
->if_flags
& IFF_RUNNING
)) {
1397 kprintf("%s: interface not running?\n", if_name(ifp
));
1402 dp
->dad_ns_ocount
++;
1403 nd6_ns_output(ifp
, NULL
, &ia
->ia_addr
.sin6_addr
, NULL
, 1);
1407 nd6_dad_ns_input(struct ifaddr
*ifa
)
1409 struct in6_ifaddr
*ia
;
1410 const struct in6_addr
*taddr6
;
1417 panic("ifa == NULL in nd6_dad_ns_input");
1419 ia
= (struct in6_ifaddr
*)ifa
;
1420 taddr6
= &ia
->ia_addr
.sin6_addr
;
1422 dp
= nd6_dad_find(ifa
);
1424 /* Quickhack - completely ignore DAD NS packets */
1425 if (dad_ignore_ns
) {
1427 "nd6_dad_ns_input: ignoring DAD NS packet for "
1428 "address %s(%s)\n", ip6_sprintf(taddr6
),
1429 if_name(ifa
->ifa_ifp
)));
1434 * if I'm yet to start DAD, someone else started using this address
1435 * first. I have a duplicate and you win.
1437 if (!dp
|| dp
->dad_ns_ocount
== 0)
1440 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1443 dp
= NULL
; /* will be freed in nd6_dad_duplicated() */
1444 nd6_dad_duplicated(ifa
);
1447 * not sure if I got a duplicate.
1448 * increment ns count and see what happens.
1451 dp
->dad_ns_icount
++;
1456 nd6_dad_na_input(struct ifaddr
*ifa
)
1463 panic("ifa == NULL in nd6_dad_na_input");
1465 dp
= nd6_dad_find(ifa
);
1467 dp
->dad_na_icount
++;
1469 /* remove the address. */
1470 nd6_dad_duplicated(ifa
);