1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
2 /* $DragonFly: src/sys/netinet6/icmp6.c,v 1.17 2005/02/01 16:09:37 hrs Exp $ */
3 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun 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 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
70 #include "opt_inet6.h"
71 #include "opt_ipsec.h"
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/malloc.h>
77 #include <sys/protosw.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83 #include <sys/domain.h>
86 #include <net/route.h>
87 #include <net/if_dl.h>
88 #include <net/if_types.h>
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet/ip6.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet6/mld6_var.h>
96 #include <netinet/in_pcb.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/nd6.h>
99 #include <netinet6/in6_ifattach.h>
100 #include <netinet6/ip6protosw.h>
103 #include <netinet6/ipsec.h>
104 #include <netproto/key/key.h>
108 #include <netproto/ipsec/ipsec.h>
109 #include <netproto/ipsec/key.h>
113 #include <net/net_osdep.h>
115 #ifdef HAVE_NRL_INPCB
118 #define in6p_laddr inp_laddr6
119 #define in6p_faddr inp_faddr6
120 #define in6p_icmp6filt inp_icmp6filt
121 #define in6p_route inp_route
122 #define in6p_socket inp_socket
123 #define in6p_flags inp_flags
124 #define in6p_moptions inp_moptions6
125 #define in6p_outputopts inp_outputopts6
126 #define in6p_ip6 inp_ipv6
127 #define in6p_flowinfo inp_flowinfo
128 #define in6p_sp inp_sp
129 #define in6p_next inp_next
130 #define in6p_prev inp_prev
132 #define sotoin6pcb sotoinpcb
134 #define in6_pcbdetach in_pcbdetach
135 #define in6_rtchange in_rtchange
138 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
141 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
145 * ppratecheck() is available, so define it here.
147 #define HAVE_PPSRATECHECK
149 extern struct domain inet6domain;
150 extern struct ip6protosw inet6sw[];
151 extern u_char ip6_protox[];
153 struct icmp6stat icmp6stat;
155 extern struct inpcbinfo ripcbinfo;
156 extern int icmp6errppslim;
157 static int icmp6errpps_count = 0;
158 static struct timeval icmp6errppslim_last;
159 extern int icmp6_nodeinfo;
161 static void icmp6_errcount (struct icmp6errstat *, int, int);
162 static int icmp6_rip6_input (struct mbuf **, int);
163 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
164 static const char *icmp6_redirect_diag (struct in6_addr *,
165 struct in6_addr *, struct in6_addr *);
166 #ifndef HAVE_PPSRATECHECK
167 static int ppsratecheck (struct timeval *, int *, int);
169 static struct mbuf *ni6_input (struct mbuf *, int);
170 static struct mbuf *ni6_nametodns (const char *, int, int);
171 static int ni6_dnsmatch (const char *, int, const char *, int);
172 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
173 struct ifnet **, char *);
174 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
175 struct ifnet *, int);
176 static int icmp6_notify_error (struct mbuf *, int, int, int);
178 #ifdef COMPAT_RFC1885
179 static struct route_in6 icmp6_reflect_rt;
190 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
193 case ICMP6_DST_UNREACH:
195 case ICMP6_DST_UNREACH_NOROUTE:
196 stat->icp6errs_dst_unreach_noroute++;
198 case ICMP6_DST_UNREACH_ADMIN:
199 stat->icp6errs_dst_unreach_admin++;
201 case ICMP6_DST_UNREACH_BEYONDSCOPE:
202 stat->icp6errs_dst_unreach_beyondscope++;
204 case ICMP6_DST_UNREACH_ADDR:
205 stat->icp6errs_dst_unreach_addr++;
207 case ICMP6_DST_UNREACH_NOPORT:
208 stat->icp6errs_dst_unreach_noport++;
212 case ICMP6_PACKET_TOO_BIG:
213 stat->icp6errs_packet_too_big++;
215 case ICMP6_TIME_EXCEEDED:
217 case ICMP6_TIME_EXCEED_TRANSIT:
218 stat->icp6errs_time_exceed_transit++;
220 case ICMP6_TIME_EXCEED_REASSEMBLY:
221 stat->icp6errs_time_exceed_reassembly++;
225 case ICMP6_PARAM_PROB:
227 case ICMP6_PARAMPROB_HEADER:
228 stat->icp6errs_paramprob_header++;
230 case ICMP6_PARAMPROB_NEXTHEADER:
231 stat->icp6errs_paramprob_nextheader++;
233 case ICMP6_PARAMPROB_OPTION:
234 stat->icp6errs_paramprob_option++;
239 stat->icp6errs_redirect++;
242 stat->icp6errs_unknown++;
246 * Generate an error packet of type error in response to bad IP6 packet.
249 icmp6_error(struct mbuf *m, int type, int code, int param)
251 struct ip6_hdr *oip6, *nip6;
252 struct icmp6_hdr *icmp6;
257 icmp6stat.icp6s_error++;
259 /* count per-type-code statistics */
260 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
262 #ifdef M_DECRYPTED /*not openbsd*/
263 if (m->m_flags & M_DECRYPTED) {
264 icmp6stat.icp6s_canterror++;
269 #ifndef PULLDOWN_TEST
270 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
272 if (m->m_len < sizeof(struct ip6_hdr)) {
273 m = m_pullup(m, sizeof(struct ip6_hdr));
278 oip6 = mtod(m, struct ip6_hdr *);
281 * Multicast destination check. For unrecognized option errors,
282 * this check has already done in ip6_unknown_opt(), so we can
283 * check only for other errors.
285 if ((m->m_flags & (M_BCAST|M_MCAST) ||
286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
287 (type != ICMP6_PACKET_TOO_BIG &&
288 (type != ICMP6_PARAM_PROB ||
289 code != ICMP6_PARAMPROB_OPTION)))
292 /* Source address check. XXX: the case of anycast source? */
293 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
294 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
298 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
302 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
303 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
304 struct icmp6_hdr *icp;
306 #ifndef PULLDOWN_TEST
307 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
308 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
310 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
313 icmp6stat.icp6s_tooshort++;
317 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
318 icp->icmp6_type == ND_REDIRECT) {
321 * Special case: for redirect (which is
322 * informational) we must not send icmp6 error.
324 icmp6stat.icp6s_canterror++;
327 /* ICMPv6 informational - send the error */
330 /* non-ICMPv6 - send the error */
333 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
335 /* Finally, do rate limitation check. */
336 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
337 icmp6stat.icp6s_toofreq++;
342 * OK, ICMP6 can be generated.
345 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
346 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
348 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
349 M_PREPEND(m, preplen, MB_DONTWAIT);
350 if (m && m->m_len < preplen)
351 m = m_pullup(m, preplen);
353 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
357 nip6 = mtod(m, struct ip6_hdr *);
358 nip6->ip6_src = oip6->ip6_src;
359 nip6->ip6_dst = oip6->ip6_dst;
361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
362 oip6->ip6_src.s6_addr16[1] = 0;
363 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
364 oip6->ip6_dst.s6_addr16[1] = 0;
366 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
367 icmp6->icmp6_type = type;
368 icmp6->icmp6_code = code;
369 icmp6->icmp6_pptr = htonl((u_int32_t)param);
372 * icmp6_reflect() is designed to be in the input path.
373 * icmp6_error() can be called from both input and outut path,
374 * and if we are in output path rcvif could contain bogus value.
375 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
376 * information in ip header (nip6).
378 m->m_pkthdr.rcvif = NULL;
380 icmp6stat.icp6s_outhist[type]++;
381 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
387 * If we can't tell wheter or not we can generate ICMP6, free it.
393 * Process a received ICMP6 message.
396 icmp6_input(struct mbuf **mp, int *offp, int proto)
398 struct mbuf *m = *mp, *n;
399 struct ip6_hdr *ip6, *nip6;
400 struct icmp6_hdr *icmp6, *nicmp6;
402 int icmp6len = m->m_pkthdr.len - *offp;
405 #ifndef PULLDOWN_TEST
406 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
407 /* m might change if M_LOOP. So, call mtod after this */
411 * Locate icmp6 structure in mbuf, and check
412 * that not corrupted and of at least minimum length
415 ip6 = mtod(m, struct ip6_hdr *);
416 if (icmp6len < sizeof(struct icmp6_hdr)) {
417 icmp6stat.icp6s_tooshort++;
422 * calculate the checksum
424 #ifndef PULLDOWN_TEST
425 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
427 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
429 icmp6stat.icp6s_tooshort++;
433 code = icmp6->icmp6_code;
435 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
437 "ICMP6 checksum error(%d|%x) %s\n",
438 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
439 icmp6stat.icp6s_checksum++;
443 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
445 * Deliver very specific ICMP6 type only.
446 * This is important to deilver TOOBIG. Otherwise PMTUD
449 switch (icmp6->icmp6_type) {
450 case ICMP6_DST_UNREACH:
451 case ICMP6_PACKET_TOO_BIG:
452 case ICMP6_TIME_EXCEEDED:
459 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
460 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
461 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
464 switch (icmp6->icmp6_type) {
465 case ICMP6_DST_UNREACH:
466 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
468 case ICMP6_DST_UNREACH_NOROUTE:
469 code = PRC_UNREACH_NET;
471 case ICMP6_DST_UNREACH_ADMIN:
472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
473 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
475 case ICMP6_DST_UNREACH_ADDR:
478 #ifdef COMPAT_RFC1885
479 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
480 code = PRC_UNREACH_SRCFAIL;
483 case ICMP6_DST_UNREACH_BEYONDSCOPE:
484 /* I mean "source address was incorrect." */
485 code = PRC_PARAMPROB;
488 case ICMP6_DST_UNREACH_NOPORT:
489 code = PRC_UNREACH_PORT;
497 case ICMP6_PACKET_TOO_BIG:
498 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
505 * Updating the path MTU will be done after examining
506 * intermediate extension headers.
511 case ICMP6_TIME_EXCEEDED:
512 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
514 case ICMP6_TIME_EXCEED_TRANSIT:
515 case ICMP6_TIME_EXCEED_REASSEMBLY:
516 code += PRC_TIMXCEED_INTRANS;
524 case ICMP6_PARAM_PROB:
525 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
527 case ICMP6_PARAMPROB_NEXTHEADER:
528 code = PRC_UNREACH_PROTOCOL;
530 case ICMP6_PARAMPROB_HEADER:
531 case ICMP6_PARAMPROB_OPTION:
532 code = PRC_PARAMPROB;
540 case ICMP6_ECHO_REQUEST:
541 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
544 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
548 if ((n->m_flags & M_EXT) != 0
549 || n->m_len < off + sizeof(struct icmp6_hdr)) {
551 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
555 * Prepare an internal mbuf. m_pullup() doesn't
556 * always copy the length we specified.
558 if (maxlen >= MCLBYTES) {
563 MGETHDR(n, MB_DONTWAIT, n0->m_type);
564 n0len = n0->m_pkthdr.len; /* save for use below */
566 M_MOVE_PKTHDR(n, n0);
567 if (n && maxlen >= MHLEN) {
568 MCLGET(n, MB_DONTWAIT);
569 if ((n->m_flags & M_EXT) == 0) {
580 * Copy IPv6 and ICMPv6 only.
582 nip6 = mtod(n, struct ip6_hdr *);
583 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
584 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
585 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
586 noff = sizeof(struct ip6_hdr);
587 /* new mbuf contains only ipv6+icmpv6 headers */
588 n->m_len = noff + sizeof(struct icmp6_hdr);
590 * Adjust mbuf. ip6_plen will be adjusted in
593 m_adj(n0, off + sizeof(struct icmp6_hdr));
594 /* recalculate complete packet size */
595 n->m_pkthdr.len = n0len + (noff - off);
598 nip6 = mtod(n, struct ip6_hdr *);
599 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
602 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
603 nicmp6->icmp6_code = 0;
605 icmp6stat.icp6s_reflect++;
606 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
607 icmp6_reflect(n, noff);
611 case ICMP6_ECHO_REPLY:
612 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
617 case MLD_LISTENER_QUERY:
618 case MLD_LISTENER_REPORT:
619 if (icmp6len < sizeof(struct mld_hdr))
621 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
622 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
625 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
635 case MLD_LISTENER_DONE:
636 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
637 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
639 break; /* nothing to be done in kernel */
641 case MLD_MTRACE_RESP:
643 /* XXX: these two are experimental. not officially defind. */
644 /* XXX: per-interface statistics? */
645 break; /* just pass it to applications */
647 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
649 enum { WRU, FQDN } mode;
654 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
656 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
661 #define hostnamelen strlen(hostname)
663 #ifndef PULLDOWN_TEST
664 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
667 n = m_copy(m, 0, M_COPYALL);
669 n = ni6_input(n, off);
670 /* XXX meaningless if n == NULL */
671 noff = sizeof(struct ip6_hdr);
676 if ((icmp6_nodeinfo & 5) != 5)
681 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
682 if (maxlen >= MCLBYTES) {
686 MGETHDR(n, MB_DONTWAIT, m->m_type);
687 if (n && maxlen > MHLEN) {
688 MCLGET(n, MB_DONTWAIT);
689 if ((n->m_flags & M_EXT) == 0) {
694 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) {
696 * Previous code did a blind M_COPY_PKTHDR
697 * and said "just for rcvif". If true, then
698 * we could tolerate the dup failing (due to
699 * the deep copy of the tag chain). For now
700 * be conservative and just fail.
709 n->m_pkthdr.rcvif = NULL;
711 maxhlen = M_TRAILINGSPACE(n) - maxlen;
712 if (maxhlen > hostnamelen)
713 maxhlen = hostnamelen;
715 * Copy IPv6 and ICMPv6 only.
717 nip6 = mtod(n, struct ip6_hdr *);
718 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
719 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
720 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
721 p = (u_char *)(nicmp6 + 1);
723 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
724 noff = sizeof(struct ip6_hdr);
725 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
726 sizeof(struct icmp6_hdr) + 4 + maxhlen;
727 nicmp6->icmp6_type = ICMP6_WRUREPLY;
728 nicmp6->icmp6_code = 0;
732 icmp6stat.icp6s_reflect++;
733 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
734 icmp6_reflect(n, noff);
744 case ND_ROUTER_SOLICIT:
745 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
748 if (icmp6len < sizeof(struct nd_router_solicit))
750 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
752 nd6_rs_input(m, off, icmp6len);
756 nd6_rs_input(n, off, icmp6len);
760 case ND_ROUTER_ADVERT:
761 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
764 if (icmp6len < sizeof(struct nd_router_advert))
766 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
768 nd6_ra_input(m, off, icmp6len);
772 nd6_ra_input(n, off, icmp6len);
776 case ND_NEIGHBOR_SOLICIT:
777 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
780 if (icmp6len < sizeof(struct nd_neighbor_solicit))
782 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
784 nd6_ns_input(m, off, icmp6len);
788 nd6_ns_input(n, off, icmp6len);
792 case ND_NEIGHBOR_ADVERT:
793 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
796 if (icmp6len < sizeof(struct nd_neighbor_advert))
798 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
800 nd6_na_input(m, off, icmp6len);
804 nd6_na_input(n, off, icmp6len);
809 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
812 if (icmp6len < sizeof(struct nd_redirect))
814 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
816 icmp6_redirect_input(m, off);
820 icmp6_redirect_input(n, off);
824 case ICMP6_ROUTER_RENUMBERING:
825 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
826 code != ICMP6_ROUTER_RENUMBERING_RESULT)
828 if (icmp6len < sizeof(struct icmp6_router_renum))
834 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
835 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
836 ip6_sprintf(&ip6->ip6_dst),
837 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
838 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
839 /* ICMPv6 error: MUST deliver it by spec... */
843 /* ICMPv6 informational: MUST not deliver */
847 if (icmp6_notify_error(m, off, icmp6len, code)) {
848 /* In this case, m should've been freed. */
849 return(IPPROTO_DONE);
854 icmp6stat.icp6s_badcode++;
858 icmp6stat.icp6s_badlen++;
862 /* deliver the packet to appropriate sockets */
863 icmp6_rip6_input(&m, *offp);
873 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
875 struct icmp6_hdr *icmp6;
876 struct ip6_hdr *eip6;
878 struct sockaddr_in6 icmp6src, icmp6dst;
880 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
881 icmp6stat.icp6s_tooshort++;
884 #ifndef PULLDOWN_TEST
885 IP6_EXTHDR_CHECK(m, off,
886 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
888 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
890 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
891 sizeof(*icmp6) + sizeof(struct ip6_hdr));
893 icmp6stat.icp6s_tooshort++;
897 eip6 = (struct ip6_hdr *)(icmp6 + 1);
899 /* Detect the upper level protocol */
901 void (*ctlfunc) (int, struct sockaddr *, void *);
902 u_int8_t nxt = eip6->ip6_nxt;
903 int eoff = off + sizeof(struct icmp6_hdr) +
904 sizeof(struct ip6_hdr);
905 struct ip6ctlparam ip6cp;
906 struct in6_addr *finaldst = NULL;
907 int icmp6type = icmp6->icmp6_type;
909 struct ip6_rthdr *rth;
910 struct ip6_rthdr0 *rth0;
913 while (1) { /* XXX: should avoid infinite loop explicitly? */
917 case IPPROTO_HOPOPTS:
918 case IPPROTO_DSTOPTS:
920 #ifndef PULLDOWN_TEST
921 IP6_EXTHDR_CHECK(m, 0, eoff +
922 sizeof(struct ip6_ext),
924 eh = (struct ip6_ext *)(mtod(m, caddr_t)
927 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
930 icmp6stat.icp6s_tooshort++;
935 if (nxt == IPPROTO_AH)
936 eoff += (eh->ip6e_len + 2) << 2;
938 eoff += (eh->ip6e_len + 1) << 3;
941 case IPPROTO_ROUTING:
943 * When the erroneous packet contains a
944 * routing header, we should examine the
945 * header to determine the final destination.
946 * Otherwise, we can't properly update
947 * information that depends on the final
948 * destination (e.g. path MTU).
950 #ifndef PULLDOWN_TEST
951 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
953 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
956 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
959 icmp6stat.icp6s_tooshort++;
963 rthlen = (rth->ip6r_len + 1) << 3;
965 * XXX: currently there is no
966 * officially defined type other
968 * Note that if the segment left field
969 * is 0, all intermediate hops must
972 if (rth->ip6r_segleft &&
973 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
976 #ifndef PULLDOWN_TEST
977 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
979 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
982 struct ip6_rthdr0 *, m,
985 icmp6stat.icp6s_tooshort++;
989 /* just ignore a bogus header */
990 if ((rth0->ip6r0_len % 2) == 0 &&
991 (hops = rth0->ip6r0_len/2))
992 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
997 case IPPROTO_FRAGMENT:
998 #ifndef PULLDOWN_TEST
999 IP6_EXTHDR_CHECK(m, 0, eoff +
1000 sizeof(struct ip6_frag),
1002 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1005 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1008 icmp6stat.icp6s_tooshort++;
1013 * Data after a fragment header is meaningless
1014 * unless it is the first fragment, but
1015 * we'll go to the notify label for path MTU
1018 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1021 eoff += sizeof(struct ip6_frag);
1026 * This case includes ESP and the No Next
1027 * Header. In such cases going to the notify
1028 * label does not have any meaning
1029 * (i.e. ctlfunc will be NULL), but we go
1030 * anyway since we might have to update
1031 * path MTU information.
1037 #ifndef PULLDOWN_TEST
1038 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1040 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1041 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1042 if (icmp6 == NULL) {
1043 icmp6stat.icp6s_tooshort++;
1048 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1049 bzero(&icmp6dst, sizeof(icmp6dst));
1050 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1051 icmp6dst.sin6_family = AF_INET6;
1052 if (finaldst == NULL)
1053 icmp6dst.sin6_addr = eip6->ip6_dst;
1055 icmp6dst.sin6_addr = *finaldst;
1056 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1057 &icmp6dst.sin6_addr);
1058 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1060 /* should be impossbile */
1062 "icmp6_notify_error: in6_embedscope failed\n"));
1067 * retrieve parameters from the inner IPv6 header, and convert
1068 * them into sockaddr structures.
1070 bzero(&icmp6src, sizeof(icmp6src));
1071 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1072 icmp6src.sin6_family = AF_INET6;
1073 icmp6src.sin6_addr = eip6->ip6_src;
1074 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1075 &icmp6src.sin6_addr);
1076 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1078 /* should be impossbile */
1080 "icmp6_notify_error: in6_embedscope failed\n"));
1083 icmp6src.sin6_flowinfo =
1084 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1086 if (finaldst == NULL)
1087 finaldst = &eip6->ip6_dst;
1089 ip6cp.ip6c_icmp6 = icmp6;
1090 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1091 ip6cp.ip6c_off = eoff;
1092 ip6cp.ip6c_finaldst = finaldst;
1093 ip6cp.ip6c_src = &icmp6src;
1094 ip6cp.ip6c_nxt = nxt;
1096 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1097 notifymtu = ntohl(icmp6->icmp6_mtu);
1098 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1099 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1102 ctlfunc = (void (*) (int, struct sockaddr *, void *))
1103 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1105 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1117 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1119 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1120 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1121 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1122 u_int mtu = ntohl(icmp6->icmp6_mtu);
1123 struct rtentry *rt = NULL;
1124 struct sockaddr_in6 sin6;
1129 bzero(&sin6, sizeof(sin6));
1130 sin6.sin6_family = PF_INET6;
1131 sin6.sin6_len = sizeof(struct sockaddr_in6);
1132 sin6.sin6_addr = *dst;
1133 /* XXX normally, this won't happen */
1134 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1135 sin6.sin6_addr.s6_addr16[1] =
1136 htons(m->m_pkthdr.rcvif->if_index);
1138 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1139 rt = rtpurelookup((struct sockaddr *)&sin6);
1141 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1142 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1143 if (mtu < IPV6_MMTU) { /* XXX */
1144 rt->rt_rmx.rmx_locks |= RTV_MTU;
1145 } else if (mtu < rt->rt_ifp->if_mtu &&
1146 rt->rt_rmx.rmx_mtu > mtu) {
1147 icmp6stat.icp6s_pmtuchg++;
1148 rt->rt_rmx.rmx_mtu = mtu;
1156 * Process a Node Information Query packet, based on
1157 * draft-ietf-ipngwg-icmp-name-lookups-07.
1159 * Spec incompatibilities:
1160 * - IPv6 Subject address handling
1161 * - IPv4 Subject address handling support missing
1162 * - Proxy reply (answer even if it's not for me)
1163 * - joins NI group address at in6_ifattach() time only, does not cope
1164 * with hostname changes by sethostname(3)
1166 #define hostnamelen strlen(hostname)
1167 static struct mbuf *
1168 ni6_input(struct mbuf *m, int off)
1170 struct icmp6_nodeinfo *ni6, *nni6;
1171 struct mbuf *n = NULL;
1174 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1175 struct ni_reply_fqdn *fqdn;
1176 int addrs; /* for NI_QTYPE_NODEADDR */
1177 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1178 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1179 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1180 struct ip6_hdr *ip6;
1181 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1183 struct in6_ifaddr *ia6 = NULL;
1185 ip6 = mtod(m, struct ip6_hdr *);
1186 #ifndef PULLDOWN_TEST
1187 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1189 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1191 /* m is already reclaimed */
1197 * Validate IPv6 destination address.
1199 * The Responder must discard the Query without further processing
1200 * unless it is one of the Responder's unicast or anycast addresses, or
1201 * a link-local scope multicast address which the Responder has joined.
1202 * [icmp-name-lookups-07, Section 4.]
1204 bzero(&sin6, sizeof(sin6));
1205 sin6.sin6_family = AF_INET6;
1206 sin6.sin6_len = sizeof(struct sockaddr_in6);
1207 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1209 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1210 /* unicast/anycast, fine */
1211 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1212 (icmp6_nodeinfo & 4) == 0) {
1213 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1214 "a temporary address in %s:%d",
1215 __FILE__, __LINE__));
1218 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1219 ; /* link-local multicast, fine */
1223 /* validate query Subject field. */
1224 qtype = ntohs(ni6->ni_qtype);
1225 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1228 case NI_QTYPE_SUPTYPES:
1230 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1234 case NI_QTYPE_NODEADDR:
1235 switch (ni6->ni_code) {
1236 case ICMP6_NI_SUBJ_IPV6:
1237 #if ICMP6_NI_SUBJ_IPV6 != 0
1241 * backward compatibility - try to accept 03 draft
1242 * format, where no Subject is present.
1244 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1249 #if ICMP6_NI_SUBJ_IPV6 != 0
1250 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1254 if (subjlen != sizeof(sin6.sin6_addr))
1258 * Validate Subject address.
1260 * Not sure what exactly "address belongs to the node"
1261 * means in the spec, is it just unicast, or what?
1263 * At this moment we consider Subject address as
1264 * "belong to the node" if the Subject address equals
1265 * to the IPv6 destination address; validation for
1266 * IPv6 destination address should have done enough
1269 * We do not do proxy at this moment.
1271 /* m_pulldown instead of copy? */
1272 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1273 subjlen, (caddr_t)&sin6.sin6_addr);
1274 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1276 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1277 bzero(&sin6_d, sizeof(sin6_d));
1278 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1279 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1280 sin6_d.sin6_addr = ip6->ip6_dst;
1281 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1283 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1284 subj = (char *)&sin6;
1285 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1289 * XXX if we are to allow other cases, we should really
1290 * be careful about scope here.
1291 * basically, we should disallow queries toward IPv6
1292 * destination X with subject Y, if scope(X) > scope(Y).
1293 * if we allow scope(X) > scope(Y), it will result in
1294 * information leakage across scope boundary.
1298 case ICMP6_NI_SUBJ_FQDN:
1300 * Validate Subject name with gethostname(3).
1302 * The behavior may need some debate, since:
1303 * - we are not sure if the node has FQDN as
1304 * hostname (returned by gethostname(3)).
1305 * - the code does wildcard match for truncated names.
1306 * however, we are not sure if we want to perform
1307 * wildcard match, if gethostname(3) side has
1308 * truncated hostname.
1310 n = ni6_nametodns(hostname, hostnamelen, 0);
1311 if (!n || n->m_next || n->m_len == 0)
1313 IP6_EXTHDR_GET(subj, char *, m,
1314 off + sizeof(struct icmp6_nodeinfo), subjlen);
1317 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1325 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1332 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1335 if ((icmp6_nodeinfo & 1) == 0)
1338 case NI_QTYPE_NODEADDR:
1339 if ((icmp6_nodeinfo & 2) == 0)
1344 /* guess reply length */
1347 break; /* no reply data */
1348 case NI_QTYPE_SUPTYPES:
1349 replylen += sizeof(u_int32_t);
1352 /* XXX will append an mbuf */
1353 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1355 case NI_QTYPE_NODEADDR:
1356 addrs = ni6_addrs(ni6, m, &ifp, subj);
1357 if ((replylen += addrs * (sizeof(struct in6_addr) +
1358 sizeof(u_int32_t))) > MCLBYTES)
1359 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1363 * XXX: We must return a reply with the ICMP6 code
1364 * `unknown Qtype' in this case. However we regard the case
1365 * as an FQDN query for backward compatibility.
1366 * Older versions set a random value to this field,
1367 * so it rarely varies in the defined qtypes.
1368 * But the mechanism is not reliable...
1369 * maybe we should obsolete older versions.
1371 qtype = NI_QTYPE_FQDN;
1372 /* XXX will append an mbuf */
1373 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1378 /* allocate an mbuf to reply. */
1379 MGETHDR(n, MB_DONTWAIT, m->m_type);
1384 M_MOVE_PKTHDR(n, m); /* just for recvif */
1385 if (replylen > MHLEN) {
1386 if (replylen > MCLBYTES) {
1388 * XXX: should we try to allocate more? But MCLBYTES
1389 * is probably much larger than IPV6_MMTU...
1393 MCLGET(n, MB_DONTWAIT);
1394 if ((n->m_flags & M_EXT) == 0) {
1398 n->m_pkthdr.len = n->m_len = replylen;
1400 /* copy mbuf header and IPv6 + Node Information base headers */
1401 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1402 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1403 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1405 /* qtype dependent procedure */
1408 nni6->ni_code = ICMP6_NI_SUCCESS;
1411 case NI_QTYPE_SUPTYPES:
1414 nni6->ni_code = ICMP6_NI_SUCCESS;
1415 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1416 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1417 v = (u_int32_t)htonl(0x0000000f);
1418 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1422 nni6->ni_code = ICMP6_NI_SUCCESS;
1423 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1424 sizeof(struct ip6_hdr) +
1425 sizeof(struct icmp6_nodeinfo));
1426 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1427 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1429 * XXX do we really have FQDN in variable "hostname"?
1431 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1432 if (n->m_next == NULL)
1434 /* XXX we assume that n->m_next is not a chain */
1435 if (n->m_next->m_next != NULL)
1437 n->m_pkthdr.len += n->m_next->m_len;
1439 case NI_QTYPE_NODEADDR:
1443 nni6->ni_code = ICMP6_NI_SUCCESS;
1444 n->m_pkthdr.len = n->m_len =
1445 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1446 lenlim = M_TRAILINGSPACE(n);
1447 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1448 /* XXX: reset mbuf length */
1449 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1450 sizeof(struct icmp6_nodeinfo) + copied;
1454 break; /* XXX impossible! */
1457 nni6->ni_type = ICMP6_NI_REPLY;
1470 * make a mbuf with DNS-encoded string. no compression support.
1472 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1473 * treated as truncated name (two \0 at the end). this is a wild guess.
1475 static struct mbuf *
1476 ni6_nametodns(const char *name, int namelen,
1477 int old) /* return pascal string if non-zero */
1489 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1490 MGET(m, MB_DONTWAIT, MT_DATA);
1491 if (m && len > MLEN) {
1492 MCLGET(m, MB_DONTWAIT);
1493 if ((m->m_flags & M_EXT) == 0)
1502 *mtod(m, char *) = namelen;
1503 bcopy(name, mtod(m, char *) + 1, namelen);
1507 cp = mtod(m, char *);
1508 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1510 /* if not certain about my name, return empty buffer */
1515 * guess if it looks like shortened hostname, or FQDN.
1516 * shortened hostname needs two trailing "\0".
1519 for (p = name; p < name + namelen; p++) {
1520 if (*p && *p == '.')
1529 while (cp < ep && p < name + namelen) {
1531 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1533 /* result does not fit into mbuf */
1534 if (cp + i + 1 >= ep)
1537 * DNS label length restriction, RFC1035 page 8.
1538 * "i == 0" case is included here to avoid returning
1539 * 0-length label on "foo..bar".
1541 if (i <= 0 || i >= 64)
1547 if (p < name + namelen && *p == '.')
1551 if (cp + nterm >= ep)
1555 m->m_len = cp - mtod(m, char *);
1559 panic("should not reach here");
1569 * check if two DNS-encoded string matches. takes care of truncated
1570 * form (with \0\0 at the end). no compression support.
1571 * XXX upper/lowercase match (see RFC2065)
1574 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1576 const char *a0, *b0;
1579 /* simplest case - need validation? */
1580 if (alen == blen && bcmp(a, b, alen) == 0)
1586 /* termination is mandatory */
1587 if (alen < 2 || blen < 2)
1589 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1594 while (a - a0 < alen && b - b0 < blen) {
1595 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1598 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1600 /* we don't support compression yet */
1601 if (a[0] >= 64 || b[0] >= 64)
1604 /* truncated case */
1605 if (a[0] == 0 && a - a0 == alen - 1)
1607 if (b[0] == 0 && b - b0 == blen - 1)
1609 if (a[0] == 0 || b[0] == 0)
1615 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1617 if (bcmp(a + 1, b + 1, l) != 0)
1624 if (a - a0 == alen && b - b0 == blen)
1631 * calculate the number of addresses to be returned in the node info reply.
1634 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1638 struct in6_ifaddr *ifa6;
1640 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1641 int addrs = 0, addrsofif, iffound = 0;
1642 int niflags = ni6->ni_flags;
1644 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1645 switch (ni6->ni_code) {
1646 case ICMP6_NI_SUBJ_IPV6:
1647 if (subj == NULL) /* must be impossible... */
1649 subj_ip6 = (struct sockaddr_in6 *)subj;
1653 * XXX: we only support IPv6 subject address for
1660 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1663 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1665 if (ifa->ifa_addr->sa_family != AF_INET6)
1667 ifa6 = (struct in6_ifaddr *)ifa;
1669 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1670 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1671 &ifa6->ia_addr.sin6_addr))
1675 * IPv4-mapped addresses can only be returned by a
1676 * Node Information proxy, since they represent
1677 * addresses of IPv4-only nodes, which perforce do
1678 * not implement this protocol.
1679 * [icmp-name-lookups-07, Section 5.4]
1680 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1681 * this function at this moment.
1684 /* What do we have to do about ::1? */
1685 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1686 case IPV6_ADDR_SCOPE_LINKLOCAL:
1687 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1690 case IPV6_ADDR_SCOPE_SITELOCAL:
1691 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1694 case IPV6_ADDR_SCOPE_GLOBAL:
1695 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1703 * check if anycast is okay.
1704 * XXX: just experimental. not in the spec.
1706 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1707 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1708 continue; /* we need only unicast addresses */
1709 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1710 (icmp6_nodeinfo & 4) == 0) {
1713 addrsofif++; /* count the address */
1727 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1728 struct ifnet *ifp0, int resid)
1730 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1731 struct in6_ifaddr *ifa6;
1733 struct ifnet *ifp_dep = NULL;
1734 int copied = 0, allow_deprecated = 0;
1735 u_char *cp = (u_char *)(nni6 + 1);
1736 int niflags = ni6->ni_flags;
1739 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1740 return(0); /* needless to copy */
1744 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1746 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1747 if (ifa->ifa_addr->sa_family != AF_INET6)
1749 ifa6 = (struct in6_ifaddr *)ifa;
1751 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1752 allow_deprecated == 0) {
1754 * prefererred address should be put before
1755 * deprecated addresses.
1758 /* record the interface for later search */
1759 if (ifp_dep == NULL)
1764 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1765 allow_deprecated != 0)
1766 continue; /* we now collect deprecated addrs */
1768 /* What do we have to do about ::1? */
1769 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1770 case IPV6_ADDR_SCOPE_LINKLOCAL:
1771 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1774 case IPV6_ADDR_SCOPE_SITELOCAL:
1775 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1778 case IPV6_ADDR_SCOPE_GLOBAL:
1779 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1787 * check if anycast is okay.
1788 * XXX: just experimental. not in the spec.
1790 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1791 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1793 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1794 (icmp6_nodeinfo & 4) == 0) {
1798 /* now we can copy the address */
1799 if (resid < sizeof(struct in6_addr) +
1800 sizeof(u_int32_t)) {
1802 * We give up much more copy.
1803 * Set the truncate flag and return.
1806 NI_NODEADDR_FLAG_TRUNCATE;
1811 * Set the TTL of the address.
1812 * The TTL value should be one of the following
1813 * according to the specification:
1815 * 1. The remaining lifetime of a DHCP lease on the
1817 * 2. The remaining Valid Lifetime of a prefix from
1818 * which the address was derived through Stateless
1819 * Autoconfiguration.
1821 * Note that we currently do not support stateful
1822 * address configuration by DHCPv6, so the former
1823 * case can't happen.
1825 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1826 ltime = ND6_INFINITE_LIFETIME;
1828 if (ifa6->ia6_lifetime.ia6t_expire >
1830 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1835 bcopy(<ime, cp, sizeof(u_int32_t));
1836 cp += sizeof(u_int32_t);
1838 /* copy the address itself */
1839 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1840 sizeof(struct in6_addr));
1841 /* XXX: KAME link-local hack; remove ifindex */
1842 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1843 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1844 cp += sizeof(struct in6_addr);
1846 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1847 copied += (sizeof(struct in6_addr) +
1850 if (ifp0) /* we need search only on the specified IF */
1854 if (allow_deprecated == 0 && ifp_dep != NULL) {
1856 allow_deprecated = 1;
1865 * XXX almost dup'ed code with rip6_input.
1868 icmp6_rip6_input(struct mbuf **mp, int off)
1870 struct mbuf *m = *mp;
1871 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1872 struct in6pcb *in6p;
1873 struct in6pcb *last = NULL;
1874 struct sockaddr_in6 rip6src;
1875 struct icmp6_hdr *icmp6;
1876 struct mbuf *opts = NULL;
1878 #ifndef PULLDOWN_TEST
1879 /* this is assumed to be safe. */
1880 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1882 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1883 if (icmp6 == NULL) {
1884 /* m is already reclaimed */
1885 return IPPROTO_DONE;
1889 bzero(&rip6src, sizeof(rip6src));
1890 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1891 rip6src.sin6_family = AF_INET6;
1892 /* KAME hack: recover scopeid */
1893 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1895 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1897 if (in6p->inp_flags & INP_PLACEMARKER)
1899 if ((in6p->inp_vflag & INP_IPV6) == 0)
1901 #ifdef HAVE_NRL_INPCB
1902 if (!(in6p->in6p_flags & INP_IPV6))
1905 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1907 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1908 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1910 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1911 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1913 if (in6p->in6p_icmp6filt
1914 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1915 in6p->in6p_icmp6filt))
1919 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1920 if (last->in6p_flags & IN6P_CONTROLOPTS)
1921 ip6_savecontrol(last, &opts, ip6, n);
1922 /* strip intermediate headers */
1924 if (sbappendaddr(&last->in6p_socket->so_rcv,
1925 (struct sockaddr *)&rip6src,
1927 /* should notify about lost packet */
1933 sorwakeup(last->in6p_socket);
1940 if (last->in6p_flags & IN6P_CONTROLOPTS)
1941 ip6_savecontrol(last, &opts, ip6, m);
1942 /* strip intermediate headers */
1944 if (sbappendaddr(&last->in6p_socket->so_rcv,
1945 (struct sockaddr *)&rip6src, m, opts) == 0) {
1950 sorwakeup(last->in6p_socket);
1953 ip6stat.ip6s_delivered--;
1955 return IPPROTO_DONE;
1959 * Reflect the ip6 packet back to the source.
1960 * OFF points to the icmp6 header, counted from the top of the mbuf.
1963 icmp6_reflect(struct mbuf *m, size_t off)
1965 struct ip6_hdr *ip6;
1966 struct icmp6_hdr *icmp6;
1967 struct in6_ifaddr *ia;
1968 struct in6_addr t, *src = 0;
1971 struct ifnet *outif = NULL;
1972 struct sockaddr_in6 sa6_src, sa6_dst;
1973 #ifdef COMPAT_RFC1885
1974 int mtu = IPV6_MMTU;
1975 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1978 /* too short to reflect */
1979 if (off < sizeof(struct ip6_hdr)) {
1981 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1982 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1983 __FILE__, __LINE__));
1988 * If there are extra headers between IPv6 and ICMPv6, strip
1989 * off that header first.
1992 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1993 panic("assumption failed in icmp6_reflect");
1995 if (off > sizeof(struct ip6_hdr)) {
1997 struct ip6_hdr nip6;
1999 l = off - sizeof(struct ip6_hdr);
2000 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2002 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2004 if ((m = m_pullup(m, l)) == NULL)
2007 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2008 } else /* off == sizeof(struct ip6_hdr) */ {
2010 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2012 if ((m = m_pullup(m, l)) == NULL)
2016 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2017 ip6 = mtod(m, struct ip6_hdr *);
2018 ip6->ip6_nxt = IPPROTO_ICMPV6;
2019 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2020 type = icmp6->icmp6_type; /* keep type for statistics */
2021 code = icmp6->icmp6_code; /* ditto. */
2025 * ip6_input() drops a packet if its src is multicast.
2026 * So, the src is never multicast.
2028 ip6->ip6_dst = ip6->ip6_src;
2031 * XXX: make sure to embed scope zone information, using
2032 * already embedded IDs or the received interface (if any).
2033 * Note that rcvif may be NULL.
2034 * TODO: scoped routing case (XXX).
2036 bzero(&sa6_src, sizeof(sa6_src));
2037 sa6_src.sin6_family = AF_INET6;
2038 sa6_src.sin6_len = sizeof(sa6_src);
2039 sa6_src.sin6_addr = ip6->ip6_dst;
2040 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2041 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2042 bzero(&sa6_dst, sizeof(sa6_dst));
2043 sa6_dst.sin6_family = AF_INET6;
2044 sa6_dst.sin6_len = sizeof(sa6_dst);
2045 sa6_dst.sin6_addr = t;
2046 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2047 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2049 #ifdef COMPAT_RFC1885
2052 * RFC 1885 requires that echo reply should be truncated if it
2053 * does not fit in with (return) path MTU, but the description was
2054 * removed in the new spec.
2056 if (icmp6_reflect_rt.ro_rt == 0 ||
2057 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2058 if (icmp6_reflect_rt.ro_rt) {
2059 RTFREE(icmp6_reflect_rt.ro_rt);
2060 icmp6_reflect_rt.ro_rt = 0;
2062 bzero(sin6, sizeof(*sin6));
2063 sin6->sin6_family = PF_INET6;
2064 sin6->sin6_len = sizeof(struct sockaddr_in6);
2065 sin6->sin6_addr = ip6->ip6_dst;
2067 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2071 if (icmp6_reflect_rt.ro_rt == 0)
2074 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2075 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2076 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2078 if (mtu < m->m_pkthdr.len) {
2079 plen -= (m->m_pkthdr.len - mtu);
2080 m_adj(m, mtu - m->m_pkthdr.len);
2084 * If the incoming packet was addressed directly to us(i.e. unicast),
2085 * use dst as the src for the reply.
2086 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2087 * (for example) when we encounter an error while forwarding procedure
2088 * destined to a duplicated address of ours.
2090 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2091 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2092 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2096 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2098 * This is the case if the dst is our link-local address
2099 * and the sender is also ourselves.
2106 struct route_in6 ro;
2109 * This case matches to multicasts, our anycast, or unicasts
2110 * that we do not own. Select a source address based on the
2111 * source address of the erroneous packet.
2113 bzero(&ro, sizeof(ro));
2114 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
2116 RTFREE(ro.ro_rt); /* XXX: we could use this */
2119 "icmp6_reflect: source can't be determined: "
2120 "dst=%s, error=%d\n",
2121 ip6_sprintf(&sa6_src.sin6_addr), e));
2126 ip6->ip6_src = *src;
2129 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2130 ip6->ip6_vfc |= IPV6_VERSION;
2131 ip6->ip6_nxt = IPPROTO_ICMPV6;
2132 if (m->m_pkthdr.rcvif) {
2133 /* XXX: This may not be the outgoing interface */
2134 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2136 ip6->ip6_hlim = ip6_defhlim;
2138 icmp6->icmp6_cksum = 0;
2139 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2140 sizeof(struct ip6_hdr), plen);
2143 * XXX option handling
2146 m->m_flags &= ~(M_BCAST|M_MCAST);
2148 #ifdef COMPAT_RFC1885
2149 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2151 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2154 icmp6_ifoutstat_inc(outif, type, code);
2164 icmp6_fasttimo(void)
2171 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2172 struct in6_addr *tgt6)
2174 static char buf[1024];
2175 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2176 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2181 icmp6_redirect_input(struct mbuf *m, int off)
2183 struct ifnet *ifp = m->m_pkthdr.rcvif;
2184 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2185 struct nd_redirect *nd_rd;
2186 int icmp6len = ntohs(ip6->ip6_plen);
2187 char *lladdr = NULL;
2189 u_char *redirhdr = NULL;
2190 int redirhdrlen = 0;
2191 struct rtentry *rt = NULL;
2194 struct in6_addr src6 = ip6->ip6_src;
2195 struct in6_addr redtgt6;
2196 struct in6_addr reddst6;
2197 union nd_opts ndopts;
2202 /* XXX if we are router, we don't update route by icmp6 redirect */
2205 if (!icmp6_rediraccept)
2208 #ifndef PULLDOWN_TEST
2209 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2210 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2212 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2213 if (nd_rd == NULL) {
2214 icmp6stat.icp6s_tooshort++;
2218 redtgt6 = nd_rd->nd_rd_target;
2219 reddst6 = nd_rd->nd_rd_dst;
2221 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2222 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2223 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2224 reddst6.s6_addr16[1] = htons(ifp->if_index);
2227 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2229 "ICMP6 redirect sent from %s rejected; "
2230 "must be from linklocal\n", ip6_sprintf(&src6)));
2233 if (ip6->ip6_hlim != 255) {
2235 "ICMP6 redirect sent from %s rejected; "
2236 "hlim=%d (must be 255)\n",
2237 ip6_sprintf(&src6), ip6->ip6_hlim));
2241 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2242 struct sockaddr_in6 sin6;
2243 struct in6_addr *gw6;
2245 bzero(&sin6, sizeof(sin6));
2246 sin6.sin6_family = AF_INET6;
2247 sin6.sin6_len = sizeof(struct sockaddr_in6);
2248 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2249 rt = rtpurelookup((struct sockaddr *)&sin6);
2251 if (rt->rt_gateway == NULL ||
2252 rt->rt_gateway->sa_family != AF_INET6) {
2254 "ICMP6 redirect rejected; no route "
2255 "with inet6 gateway found for redirect dst: %s\n",
2256 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2261 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2262 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2264 "ICMP6 redirect rejected; "
2265 "not equal to gw-for-src=%s (must be same): "
2268 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2274 "ICMP6 redirect rejected; "
2275 "no route found for redirect dst: %s\n",
2276 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2282 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2284 "ICMP6 redirect rejected; "
2285 "redirect dst must be unicast: %s\n",
2286 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2290 is_router = is_onlink = 0;
2291 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2292 is_router = 1; /* router case */
2293 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2294 is_onlink = 1; /* on-link destination case */
2295 if (!is_router && !is_onlink) {
2297 "ICMP6 redirect rejected; "
2298 "neither router case nor onlink case: %s\n",
2299 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2302 /* validation passed */
2304 icmp6len -= sizeof(*nd_rd);
2305 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2306 if (nd6_options(&ndopts) < 0) {
2307 nd6log((LOG_INFO, "icmp6_redirect_input: "
2308 "invalid ND option, rejected: %s\n",
2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2310 /* nd6_options have incremented stats */
2314 if (ndopts.nd_opts_tgt_lladdr) {
2315 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2316 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2319 if (ndopts.nd_opts_rh) {
2320 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2321 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2324 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2326 "icmp6_redirect_input: lladdrlen mismatch for %s "
2327 "(if %d, icmp6 packet %d): %s\n",
2328 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2329 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2334 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2335 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2337 if (!is_onlink) { /* better router case. perform rtredirect. */
2338 /* perform rtredirect */
2339 struct sockaddr_in6 sdst;
2340 struct sockaddr_in6 sgw;
2341 struct sockaddr_in6 ssrc;
2343 bzero(&sdst, sizeof(sdst));
2344 bzero(&sgw, sizeof(sgw));
2345 bzero(&ssrc, sizeof(ssrc));
2346 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2347 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2348 sizeof(struct sockaddr_in6);
2349 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2350 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2351 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2352 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2353 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2354 (struct sockaddr *)&ssrc,
2355 (struct rtentry **)NULL);
2357 /* finally update cached route in each socket via pfctlinput */
2359 struct sockaddr_in6 sdst;
2361 bzero(&sdst, sizeof(sdst));
2362 sdst.sin6_family = AF_INET6;
2363 sdst.sin6_len = sizeof(struct sockaddr_in6);
2364 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2365 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2367 key_sa_routechange((struct sockaddr *)&sdst);
2376 icmp6stat.icp6s_badredirect++;
2381 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2383 struct ifnet *ifp; /* my outgoing interface */
2384 struct in6_addr *ifp_ll6;
2385 struct in6_addr *router_ll6;
2386 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2387 struct mbuf *m = NULL; /* newly allocated one */
2388 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2389 struct nd_redirect *nd_rd;
2392 struct ifnet *outif = NULL;
2393 struct sockaddr_in6 src_sa;
2395 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2397 /* if we are not router, we don't send icmp6 redirect */
2398 if (!ip6_forwarding || ip6_accept_rtadv)
2402 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2407 * the source address must identify a neighbor, and
2408 * the destination address must not be a multicast address
2409 * [RFC 2461, sec 8.2]
2411 sip6 = mtod(m0, struct ip6_hdr *);
2412 bzero(&src_sa, sizeof(src_sa));
2413 src_sa.sin6_family = AF_INET6;
2414 src_sa.sin6_len = sizeof(src_sa);
2415 src_sa.sin6_addr = sip6->ip6_src;
2416 /* we don't currently use sin6_scope_id, but eventually use it */
2417 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2418 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2420 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2421 goto fail; /* what should we do here? */
2424 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2428 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2429 * we almost always ask for an mbuf cluster for simplicity.
2430 * (MHLEN < IPV6_MMTU is almost always true)
2432 #if IPV6_MMTU >= MCLBYTES
2433 # error assumption failed about IPV6_MMTU and MCLBYTES
2435 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
2436 if (m && IPV6_MMTU >= MHLEN)
2437 MCLGET(m, MB_DONTWAIT);
2440 m->m_pkthdr.rcvif = NULL;
2442 maxlen = M_TRAILINGSPACE(m);
2443 maxlen = min(IPV6_MMTU, maxlen);
2444 /* just for safety */
2445 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2446 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2451 /* get ip6 linklocal address for ifp(my outgoing interface). */
2452 struct in6_ifaddr *ia;
2453 if ((ia = in6ifa_ifpforlinklocal(ifp,
2455 IN6_IFF_ANYCAST)) == NULL)
2457 ifp_ll6 = &ia->ia_addr.sin6_addr;
2460 /* get ip6 linklocal address for the router. */
2461 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2462 struct sockaddr_in6 *sin6;
2463 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2464 router_ll6 = &sin6->sin6_addr;
2465 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2466 router_ll6 = (struct in6_addr *)NULL;
2468 router_ll6 = (struct in6_addr *)NULL;
2471 ip6 = mtod(m, struct ip6_hdr *);
2473 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2474 ip6->ip6_vfc |= IPV6_VERSION;
2475 /* ip6->ip6_plen will be set later */
2476 ip6->ip6_nxt = IPPROTO_ICMPV6;
2477 ip6->ip6_hlim = 255;
2478 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2479 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2480 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2483 nd_rd = (struct nd_redirect *)(ip6 + 1);
2484 nd_rd->nd_rd_type = ND_REDIRECT;
2485 nd_rd->nd_rd_code = 0;
2486 nd_rd->nd_rd_reserved = 0;
2487 if (rt->rt_flags & RTF_GATEWAY) {
2489 * nd_rd->nd_rd_target must be a link-local address in
2490 * better router cases.
2494 bcopy(router_ll6, &nd_rd->nd_rd_target,
2495 sizeof(nd_rd->nd_rd_target));
2496 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2497 sizeof(nd_rd->nd_rd_dst));
2499 /* make sure redtgt == reddst */
2500 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2501 sizeof(nd_rd->nd_rd_target));
2502 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2503 sizeof(nd_rd->nd_rd_dst));
2506 p = (u_char *)(nd_rd + 1);
2512 /* target lladdr option */
2513 struct rtentry *rt_router = NULL;
2515 struct sockaddr_dl *sdl;
2516 struct nd_opt_hdr *nd_opt;
2519 rt_router = nd6_lookup(router_ll6, 0, ifp);
2522 len = sizeof(*nd_opt) + ifp->if_addrlen;
2523 len = (len + 7) & ~7; /* round by 8 */
2525 if (len + (p - (u_char *)ip6) > maxlen)
2527 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2528 (rt_router->rt_flags & RTF_LLINFO) &&
2529 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2530 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2532 nd_opt = (struct nd_opt_hdr *)p;
2533 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2534 nd_opt->nd_opt_len = len >> 3;
2535 lladdr = (char *)(nd_opt + 1);
2536 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2542 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2544 /* just to be safe */
2545 #ifdef M_DECRYPTED /*not openbsd*/
2546 if (m0->m_flags & M_DECRYPTED)
2549 if (p - (u_char *)ip6 > maxlen)
2553 /* redirected header option */
2555 struct nd_opt_rd_hdr *nd_opt_rh;
2558 * compute the maximum size for icmp6 redirect header option.
2559 * XXX room for auth header?
2561 len = maxlen - (p - (u_char *)ip6);
2564 /* This is just for simplicity. */
2565 if (m0->m_pkthdr.len != m0->m_len) {
2567 m_freem(m0->m_next);
2570 m0->m_pkthdr.len = m0->m_len;
2574 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2575 * about padding/truncate rule for the original IP packet.
2576 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2577 * - "attach as much as possible" is the goal
2578 * - pad if not aligned (original size can be guessed by original
2580 * Following code adds the padding if it is simple enough,
2581 * and truncates if not.
2583 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2584 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2586 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2587 /* not enough room, truncate */
2588 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2590 /* enough room, pad or truncate */
2593 extra = m0->m_pkthdr.len % 8;
2595 /* pad if easy enough, truncate if not */
2596 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2598 m0->m_len += (8 - extra);
2599 m0->m_pkthdr.len += (8 - extra);
2602 m0->m_pkthdr.len -= extra;
2606 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2607 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2610 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2611 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2612 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2613 nd_opt_rh->nd_opt_rh_len = len >> 3;
2614 p += sizeof(*nd_opt_rh);
2615 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2617 /* connect m0 to m */
2619 m->m_pkthdr.len = m->m_len + m0->m_len;
2623 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2624 sip6->ip6_src.s6_addr16[1] = 0;
2625 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2626 sip6->ip6_dst.s6_addr16[1] = 0;
2628 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2629 ip6->ip6_src.s6_addr16[1] = 0;
2630 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2631 ip6->ip6_dst.s6_addr16[1] = 0;
2633 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2634 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2635 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2636 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2638 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2640 nd_rd->nd_rd_cksum = 0;
2642 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2644 /* send the packet to outside... */
2645 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2647 icmp6_ifstat_inc(outif, ifs6_out_msg);
2648 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2650 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2661 #ifdef HAVE_NRL_INPCB
2662 #define sotoin6pcb sotoinpcb
2663 #define in6pcb inpcb
2664 #define in6p_icmp6filt inp_icmp6filt
2667 * ICMPv6 socket option processing.
2670 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2674 struct inpcb *inp = sotoinpcb(so);
2675 int level, op, optname;
2678 level = sopt->sopt_level;
2679 op = sopt->sopt_dir;
2680 optname = sopt->sopt_name;
2681 optlen = sopt->sopt_valsize;
2683 level = op = optname = optlen = 0;
2685 if (level != IPPROTO_ICMPV6) {
2694 struct icmp6_filter *p;
2696 if (optlen != sizeof(*p)) {
2700 if (inp->in6p_icmp6filt == NULL) {
2704 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2710 error = ENOPROTOOPT;
2719 if (inp->in6p_icmp6filt == NULL) {
2723 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2724 sizeof(struct icmp6_filter));
2729 error = ENOPROTOOPT;
2737 #ifdef HAVE_NRL_INPCB
2740 #undef in6p_icmp6filt
2743 #ifndef HAVE_PPSRATECHECK
2745 #define timersub(tvp, uvp, vvp) \
2747 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2748 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2749 if ((vvp)->tv_usec < 0) { \
2751 (vvp)->tv_usec += 1000000; \
2757 * ppsratecheck(): packets (or events) per second limitation.
2760 ppsratecheck(struct timeval *lasttime, int *curpps,
2761 int maxpps) /* maximum pps allowed */
2763 struct timeval tv, delta;
2768 timersub(&tv, lasttime, &delta);
2771 * Check for 0,0 so that the message will be seen at least once.
2772 * If more than one second has passed since the last update of
2773 * lasttime, reset the counter.
2775 * We do increment *curpps even in *curpps < maxpps case, as some may
2776 * try to use *curpps for stat purposes as well.
2778 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2779 delta.tv_sec >= 1) {
2783 } else if (maxpps < 0)
2785 else if (*curpps < maxpps)
2790 #if 1 /* DIAGNOSTIC? */
2791 /* be careful about wrap-around */
2792 if (*curpps + 1 > *curpps)
2793 *curpps = *curpps + 1;
2796 * assume that there's not too many calls to this function.
2797 * not sure if the assumption holds, as it depends on *caller's*
2798 * behavior, not the behavior of this function.
2799 * IMHO it is wrong to make assumption on the caller's behavior,
2800 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2802 *curpps = *curpps + 1;
2810 * Perform rate limit check.
2811 * Returns 0 if it is okay to send the icmp6 packet.
2812 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2815 * XXX per-destination/type check necessary?
2818 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2819 const int type, /* not used at this moment */
2820 const int code) /* not used at this moment */
2824 ret = 0; /* okay to send */
2827 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2829 /* The packet is subject to rate limit */