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 1.18 2005/02/08 22:56:19 hsu 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 in6_pcbdetach in_pcbdetach
133 #define in6_rtchange in_rtchange
136 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
139 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
143 * ppratecheck() is available, so define it here.
145 #define HAVE_PPSRATECHECK
147 extern struct domain inet6domain;
148 extern struct ip6protosw inet6sw[];
149 extern u_char ip6_protox[];
151 struct icmp6stat icmp6stat;
153 extern struct inpcbinfo ripcbinfo;
154 extern int icmp6errppslim;
155 static int icmp6errpps_count = 0;
156 static struct timeval icmp6errppslim_last;
157 extern int icmp6_nodeinfo;
159 static void icmp6_errcount (struct icmp6errstat *, int, int);
160 static int icmp6_rip6_input (struct mbuf **, int);
161 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
162 static const char *icmp6_redirect_diag (struct in6_addr *,
163 struct in6_addr *, struct in6_addr *);
164 #ifndef HAVE_PPSRATECHECK
165 static int ppsratecheck (struct timeval *, int *, int);
167 static struct mbuf *ni6_input (struct mbuf *, int);
168 static struct mbuf *ni6_nametodns (const char *, int, int);
169 static int ni6_dnsmatch (const char *, int, const char *, int);
170 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
171 struct ifnet **, char *);
172 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
173 struct ifnet *, int);
174 static int icmp6_notify_error (struct mbuf *, int, int, int);
176 #ifdef COMPAT_RFC1885
177 static struct route_in6 icmp6_reflect_rt;
188 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
191 case ICMP6_DST_UNREACH:
193 case ICMP6_DST_UNREACH_NOROUTE:
194 stat->icp6errs_dst_unreach_noroute++;
196 case ICMP6_DST_UNREACH_ADMIN:
197 stat->icp6errs_dst_unreach_admin++;
199 case ICMP6_DST_UNREACH_BEYONDSCOPE:
200 stat->icp6errs_dst_unreach_beyondscope++;
202 case ICMP6_DST_UNREACH_ADDR:
203 stat->icp6errs_dst_unreach_addr++;
205 case ICMP6_DST_UNREACH_NOPORT:
206 stat->icp6errs_dst_unreach_noport++;
210 case ICMP6_PACKET_TOO_BIG:
211 stat->icp6errs_packet_too_big++;
213 case ICMP6_TIME_EXCEEDED:
215 case ICMP6_TIME_EXCEED_TRANSIT:
216 stat->icp6errs_time_exceed_transit++;
218 case ICMP6_TIME_EXCEED_REASSEMBLY:
219 stat->icp6errs_time_exceed_reassembly++;
223 case ICMP6_PARAM_PROB:
225 case ICMP6_PARAMPROB_HEADER:
226 stat->icp6errs_paramprob_header++;
228 case ICMP6_PARAMPROB_NEXTHEADER:
229 stat->icp6errs_paramprob_nextheader++;
231 case ICMP6_PARAMPROB_OPTION:
232 stat->icp6errs_paramprob_option++;
237 stat->icp6errs_redirect++;
240 stat->icp6errs_unknown++;
244 * Generate an error packet of type error in response to bad IP6 packet.
247 icmp6_error(struct mbuf *m, int type, int code, int param)
249 struct ip6_hdr *oip6, *nip6;
250 struct icmp6_hdr *icmp6;
255 icmp6stat.icp6s_error++;
257 /* count per-type-code statistics */
258 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
260 #ifdef M_DECRYPTED /*not openbsd*/
261 if (m->m_flags & M_DECRYPTED) {
262 icmp6stat.icp6s_canterror++;
267 #ifndef PULLDOWN_TEST
268 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
270 if (m->m_len < sizeof(struct ip6_hdr)) {
271 m = m_pullup(m, sizeof(struct ip6_hdr));
276 oip6 = mtod(m, struct ip6_hdr *);
279 * Multicast destination check. For unrecognized option errors,
280 * this check has already done in ip6_unknown_opt(), so we can
281 * check only for other errors.
283 if ((m->m_flags & (M_BCAST|M_MCAST) ||
284 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
285 (type != ICMP6_PACKET_TOO_BIG &&
286 (type != ICMP6_PARAM_PROB ||
287 code != ICMP6_PARAMPROB_OPTION)))
290 /* Source address check. XXX: the case of anycast source? */
291 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
292 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
296 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
300 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
301 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
302 struct icmp6_hdr *icp;
304 #ifndef PULLDOWN_TEST
305 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
306 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
308 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
311 icmp6stat.icp6s_tooshort++;
315 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
316 icp->icmp6_type == ND_REDIRECT) {
319 * Special case: for redirect (which is
320 * informational) we must not send icmp6 error.
322 icmp6stat.icp6s_canterror++;
325 /* ICMPv6 informational - send the error */
328 /* non-ICMPv6 - send the error */
331 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
333 /* Finally, do rate limitation check. */
334 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
335 icmp6stat.icp6s_toofreq++;
340 * OK, ICMP6 can be generated.
343 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
344 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
346 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
347 M_PREPEND(m, preplen, MB_DONTWAIT);
348 if (m && m->m_len < preplen)
349 m = m_pullup(m, preplen);
351 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
355 nip6 = mtod(m, struct ip6_hdr *);
356 nip6->ip6_src = oip6->ip6_src;
357 nip6->ip6_dst = oip6->ip6_dst;
359 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
360 oip6->ip6_src.s6_addr16[1] = 0;
361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
362 oip6->ip6_dst.s6_addr16[1] = 0;
364 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
365 icmp6->icmp6_type = type;
366 icmp6->icmp6_code = code;
367 icmp6->icmp6_pptr = htonl((u_int32_t)param);
370 * icmp6_reflect() is designed to be in the input path.
371 * icmp6_error() can be called from both input and outut path,
372 * and if we are in output path rcvif could contain bogus value.
373 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
374 * information in ip header (nip6).
376 m->m_pkthdr.rcvif = NULL;
378 icmp6stat.icp6s_outhist[type]++;
379 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
385 * If we can't tell wheter or not we can generate ICMP6, free it.
391 * Process a received ICMP6 message.
394 icmp6_input(struct mbuf **mp, int *offp, int proto)
396 struct mbuf *m = *mp, *n;
397 struct ip6_hdr *ip6, *nip6;
398 struct icmp6_hdr *icmp6, *nicmp6;
400 int icmp6len = m->m_pkthdr.len - *offp;
403 #ifndef PULLDOWN_TEST
404 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
405 /* m might change if M_LOOP. So, call mtod after this */
409 * Locate icmp6 structure in mbuf, and check
410 * that not corrupted and of at least minimum length
413 ip6 = mtod(m, struct ip6_hdr *);
414 if (icmp6len < sizeof(struct icmp6_hdr)) {
415 icmp6stat.icp6s_tooshort++;
420 * calculate the checksum
422 #ifndef PULLDOWN_TEST
423 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
425 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
427 icmp6stat.icp6s_tooshort++;
431 code = icmp6->icmp6_code;
433 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
435 "ICMP6 checksum error(%d|%x) %s\n",
436 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
437 icmp6stat.icp6s_checksum++;
441 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
443 * Deliver very specific ICMP6 type only.
444 * This is important to deilver TOOBIG. Otherwise PMTUD
447 switch (icmp6->icmp6_type) {
448 case ICMP6_DST_UNREACH:
449 case ICMP6_PACKET_TOO_BIG:
450 case ICMP6_TIME_EXCEEDED:
457 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
458 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
459 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
460 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
462 switch (icmp6->icmp6_type) {
463 case ICMP6_DST_UNREACH:
464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
466 case ICMP6_DST_UNREACH_NOROUTE:
467 code = PRC_UNREACH_NET;
469 case ICMP6_DST_UNREACH_ADMIN:
470 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
471 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
473 case ICMP6_DST_UNREACH_ADDR:
476 #ifdef COMPAT_RFC1885
477 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
478 code = PRC_UNREACH_SRCFAIL;
481 case ICMP6_DST_UNREACH_BEYONDSCOPE:
482 /* I mean "source address was incorrect." */
483 code = PRC_PARAMPROB;
486 case ICMP6_DST_UNREACH_NOPORT:
487 code = PRC_UNREACH_PORT;
495 case ICMP6_PACKET_TOO_BIG:
496 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
503 * Updating the path MTU will be done after examining
504 * intermediate extension headers.
509 case ICMP6_TIME_EXCEEDED:
510 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
512 case ICMP6_TIME_EXCEED_TRANSIT:
513 case ICMP6_TIME_EXCEED_REASSEMBLY:
514 code += PRC_TIMXCEED_INTRANS;
522 case ICMP6_PARAM_PROB:
523 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
525 case ICMP6_PARAMPROB_NEXTHEADER:
526 code = PRC_UNREACH_PROTOCOL;
528 case ICMP6_PARAMPROB_HEADER:
529 case ICMP6_PARAMPROB_OPTION:
530 code = PRC_PARAMPROB;
538 case ICMP6_ECHO_REQUEST:
539 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
542 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
546 if ((n->m_flags & M_EXT) != 0
547 || n->m_len < off + sizeof(struct icmp6_hdr)) {
549 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
553 * Prepare an internal mbuf. m_pullup() doesn't
554 * always copy the length we specified.
556 if (maxlen >= MCLBYTES) {
561 MGETHDR(n, MB_DONTWAIT, n0->m_type);
562 n0len = n0->m_pkthdr.len; /* save for use below */
564 M_MOVE_PKTHDR(n, n0);
565 if (n && maxlen >= MHLEN) {
566 MCLGET(n, MB_DONTWAIT);
567 if ((n->m_flags & M_EXT) == 0) {
578 * Copy IPv6 and ICMPv6 only.
580 nip6 = mtod(n, struct ip6_hdr *);
581 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
582 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
583 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
584 noff = sizeof(struct ip6_hdr);
585 /* new mbuf contains only ipv6+icmpv6 headers */
586 n->m_len = noff + sizeof(struct icmp6_hdr);
588 * Adjust mbuf. ip6_plen will be adjusted in
591 m_adj(n0, off + sizeof(struct icmp6_hdr));
592 /* recalculate complete packet size */
593 n->m_pkthdr.len = n0len + (noff - off);
596 nip6 = mtod(n, struct ip6_hdr *);
597 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
600 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
601 nicmp6->icmp6_code = 0;
603 icmp6stat.icp6s_reflect++;
604 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
605 icmp6_reflect(n, noff);
609 case ICMP6_ECHO_REPLY:
610 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
615 case MLD_LISTENER_QUERY:
616 case MLD_LISTENER_REPORT:
617 if (icmp6len < sizeof(struct mld_hdr))
619 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
620 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
622 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
623 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
633 case MLD_LISTENER_DONE:
634 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
635 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
637 break; /* nothing to be done in kernel */
639 case MLD_MTRACE_RESP:
641 /* XXX: these two are experimental. not officially defind. */
642 /* XXX: per-interface statistics? */
643 break; /* just pass it to applications */
645 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
647 enum { WRU, FQDN } mode;
652 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
654 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
659 #define hostnamelen strlen(hostname)
661 #ifndef PULLDOWN_TEST
662 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
665 n = m_copy(m, 0, M_COPYALL);
667 n = ni6_input(n, off);
668 /* XXX meaningless if n == NULL */
669 noff = sizeof(struct ip6_hdr);
674 if ((icmp6_nodeinfo & 5) != 5)
679 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
680 if (maxlen >= MCLBYTES) {
684 MGETHDR(n, MB_DONTWAIT, m->m_type);
685 if (n && maxlen > MHLEN) {
686 MCLGET(n, MB_DONTWAIT);
687 if ((n->m_flags & M_EXT) == 0) {
692 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) {
694 * Previous code did a blind M_COPY_PKTHDR
695 * and said "just for rcvif". If true, then
696 * we could tolerate the dup failing (due to
697 * the deep copy of the tag chain). For now
698 * be conservative and just fail.
707 n->m_pkthdr.rcvif = NULL;
709 maxhlen = M_TRAILINGSPACE(n) - maxlen;
710 if (maxhlen > hostnamelen)
711 maxhlen = hostnamelen;
713 * Copy IPv6 and ICMPv6 only.
715 nip6 = mtod(n, struct ip6_hdr *);
716 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
717 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
718 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
719 p = (u_char *)(nicmp6 + 1);
721 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
722 noff = sizeof(struct ip6_hdr);
723 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
724 sizeof(struct icmp6_hdr) + 4 + maxhlen;
725 nicmp6->icmp6_type = ICMP6_WRUREPLY;
726 nicmp6->icmp6_code = 0;
730 icmp6stat.icp6s_reflect++;
731 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
732 icmp6_reflect(n, noff);
742 case ND_ROUTER_SOLICIT:
743 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
746 if (icmp6len < sizeof(struct nd_router_solicit))
748 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
750 nd6_rs_input(m, off, icmp6len);
754 nd6_rs_input(n, off, icmp6len);
758 case ND_ROUTER_ADVERT:
759 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
762 if (icmp6len < sizeof(struct nd_router_advert))
764 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
766 nd6_ra_input(m, off, icmp6len);
770 nd6_ra_input(n, off, icmp6len);
774 case ND_NEIGHBOR_SOLICIT:
775 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
778 if (icmp6len < sizeof(struct nd_neighbor_solicit))
780 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
782 nd6_ns_input(m, off, icmp6len);
786 nd6_ns_input(n, off, icmp6len);
790 case ND_NEIGHBOR_ADVERT:
791 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
794 if (icmp6len < sizeof(struct nd_neighbor_advert))
796 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
798 nd6_na_input(m, off, icmp6len);
802 nd6_na_input(n, off, icmp6len);
807 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
810 if (icmp6len < sizeof(struct nd_redirect))
812 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
814 icmp6_redirect_input(m, off);
818 icmp6_redirect_input(n, off);
822 case ICMP6_ROUTER_RENUMBERING:
823 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
824 code != ICMP6_ROUTER_RENUMBERING_RESULT)
826 if (icmp6len < sizeof(struct icmp6_router_renum))
832 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
833 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
834 ip6_sprintf(&ip6->ip6_dst),
835 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
836 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
837 /* ICMPv6 error: MUST deliver it by spec... */
841 /* ICMPv6 informational: MUST not deliver */
845 if (icmp6_notify_error(m, off, icmp6len, code)) {
846 /* In this case, m should've been freed. */
847 return(IPPROTO_DONE);
852 icmp6stat.icp6s_badcode++;
856 icmp6stat.icp6s_badlen++;
860 /* deliver the packet to appropriate sockets */
861 icmp6_rip6_input(&m, *offp);
871 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
873 struct icmp6_hdr *icmp6;
874 struct ip6_hdr *eip6;
876 struct sockaddr_in6 icmp6src, icmp6dst;
878 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
879 icmp6stat.icp6s_tooshort++;
882 #ifndef PULLDOWN_TEST
883 IP6_EXTHDR_CHECK(m, off,
884 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
886 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
888 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
889 sizeof(*icmp6) + sizeof(struct ip6_hdr));
891 icmp6stat.icp6s_tooshort++;
895 eip6 = (struct ip6_hdr *)(icmp6 + 1);
897 /* Detect the upper level protocol */
899 void (*ctlfunc) (int, struct sockaddr *, void *);
900 u_int8_t nxt = eip6->ip6_nxt;
901 int eoff = off + sizeof(struct icmp6_hdr) +
902 sizeof(struct ip6_hdr);
903 struct ip6ctlparam ip6cp;
904 struct in6_addr *finaldst = NULL;
905 int icmp6type = icmp6->icmp6_type;
907 struct ip6_rthdr *rth;
908 struct ip6_rthdr0 *rth0;
911 while (1) { /* XXX: should avoid infinite loop explicitly? */
915 case IPPROTO_HOPOPTS:
916 case IPPROTO_DSTOPTS:
918 #ifndef PULLDOWN_TEST
919 IP6_EXTHDR_CHECK(m, 0, eoff +
920 sizeof(struct ip6_ext),
922 eh = (struct ip6_ext *)(mtod(m, caddr_t)
925 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
928 icmp6stat.icp6s_tooshort++;
933 if (nxt == IPPROTO_AH)
934 eoff += (eh->ip6e_len + 2) << 2;
936 eoff += (eh->ip6e_len + 1) << 3;
939 case IPPROTO_ROUTING:
941 * When the erroneous packet contains a
942 * routing header, we should examine the
943 * header to determine the final destination.
944 * Otherwise, we can't properly update
945 * information that depends on the final
946 * destination (e.g. path MTU).
948 #ifndef PULLDOWN_TEST
949 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
951 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
954 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
957 icmp6stat.icp6s_tooshort++;
961 rthlen = (rth->ip6r_len + 1) << 3;
963 * XXX: currently there is no
964 * officially defined type other
966 * Note that if the segment left field
967 * is 0, all intermediate hops must
970 if (rth->ip6r_segleft &&
971 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
974 #ifndef PULLDOWN_TEST
975 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen,
977 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff);
980 struct ip6_rthdr0 *, m,
983 icmp6stat.icp6s_tooshort++;
987 /* just ignore a bogus header */
988 if ((rth0->ip6r0_len % 2) == 0 &&
989 (hops = rth0->ip6r0_len/2))
990 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
995 case IPPROTO_FRAGMENT:
996 #ifndef PULLDOWN_TEST
997 IP6_EXTHDR_CHECK(m, 0, eoff +
998 sizeof(struct ip6_frag),
1000 fh = (struct ip6_frag *)(mtod(m, caddr_t)
1003 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1006 icmp6stat.icp6s_tooshort++;
1011 * Data after a fragment header is meaningless
1012 * unless it is the first fragment, but
1013 * we'll go to the notify label for path MTU
1016 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1019 eoff += sizeof(struct ip6_frag);
1024 * This case includes ESP and the No Next
1025 * Header. In such cases going to the notify
1026 * label does not have any meaning
1027 * (i.e. ctlfunc will be NULL), but we go
1028 * anyway since we might have to update
1029 * path MTU information.
1035 #ifndef PULLDOWN_TEST
1036 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1038 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1039 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1040 if (icmp6 == NULL) {
1041 icmp6stat.icp6s_tooshort++;
1046 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1047 bzero(&icmp6dst, sizeof(icmp6dst));
1048 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1049 icmp6dst.sin6_family = AF_INET6;
1050 if (finaldst == NULL)
1051 icmp6dst.sin6_addr = eip6->ip6_dst;
1053 icmp6dst.sin6_addr = *finaldst;
1054 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1055 &icmp6dst.sin6_addr);
1056 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1058 /* should be impossbile */
1060 "icmp6_notify_error: in6_embedscope failed\n"));
1065 * retrieve parameters from the inner IPv6 header, and convert
1066 * them into sockaddr structures.
1068 bzero(&icmp6src, sizeof(icmp6src));
1069 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1070 icmp6src.sin6_family = AF_INET6;
1071 icmp6src.sin6_addr = eip6->ip6_src;
1072 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1073 &icmp6src.sin6_addr);
1074 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1076 /* should be impossbile */
1078 "icmp6_notify_error: in6_embedscope failed\n"));
1081 icmp6src.sin6_flowinfo =
1082 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1084 if (finaldst == NULL)
1085 finaldst = &eip6->ip6_dst;
1087 ip6cp.ip6c_icmp6 = icmp6;
1088 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1089 ip6cp.ip6c_off = eoff;
1090 ip6cp.ip6c_finaldst = finaldst;
1091 ip6cp.ip6c_src = &icmp6src;
1092 ip6cp.ip6c_nxt = nxt;
1094 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1095 notifymtu = ntohl(icmp6->icmp6_mtu);
1096 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1097 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1100 ctlfunc = (void (*) (int, struct sockaddr *, void *))
1101 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1103 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1115 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1117 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1118 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1119 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1120 u_int mtu = ntohl(icmp6->icmp6_mtu);
1121 struct rtentry *rt = NULL;
1122 struct sockaddr_in6 sin6;
1127 bzero(&sin6, sizeof(sin6));
1128 sin6.sin6_family = PF_INET6;
1129 sin6.sin6_len = sizeof(struct sockaddr_in6);
1130 sin6.sin6_addr = *dst;
1131 /* XXX normally, this won't happen */
1132 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1133 sin6.sin6_addr.s6_addr16[1] =
1134 htons(m->m_pkthdr.rcvif->if_index);
1136 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1137 rt = rtpurelookup((struct sockaddr *)&sin6);
1139 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1140 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1141 if (mtu < IPV6_MMTU) { /* XXX */
1142 rt->rt_rmx.rmx_locks |= RTV_MTU;
1143 } else if (mtu < rt->rt_ifp->if_mtu &&
1144 rt->rt_rmx.rmx_mtu > mtu) {
1145 icmp6stat.icp6s_pmtuchg++;
1146 rt->rt_rmx.rmx_mtu = mtu;
1154 * Process a Node Information Query packet, based on
1155 * draft-ietf-ipngwg-icmp-name-lookups-07.
1157 * Spec incompatibilities:
1158 * - IPv6 Subject address handling
1159 * - IPv4 Subject address handling support missing
1160 * - Proxy reply (answer even if it's not for me)
1161 * - joins NI group address at in6_ifattach() time only, does not cope
1162 * with hostname changes by sethostname(3)
1164 #define hostnamelen strlen(hostname)
1165 static struct mbuf *
1166 ni6_input(struct mbuf *m, int off)
1168 struct icmp6_nodeinfo *ni6, *nni6;
1169 struct mbuf *n = NULL;
1172 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1173 struct ni_reply_fqdn *fqdn;
1174 int addrs; /* for NI_QTYPE_NODEADDR */
1175 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1176 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1177 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1178 struct ip6_hdr *ip6;
1179 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1181 struct in6_ifaddr *ia6 = NULL;
1183 ip6 = mtod(m, struct ip6_hdr *);
1184 #ifndef PULLDOWN_TEST
1185 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1187 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1189 /* m is already reclaimed */
1195 * Validate IPv6 destination address.
1197 * The Responder must discard the Query without further processing
1198 * unless it is one of the Responder's unicast or anycast addresses, or
1199 * a link-local scope multicast address which the Responder has joined.
1200 * [icmp-name-lookups-07, Section 4.]
1202 bzero(&sin6, sizeof(sin6));
1203 sin6.sin6_family = AF_INET6;
1204 sin6.sin6_len = sizeof(struct sockaddr_in6);
1205 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1207 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1208 /* unicast/anycast, fine */
1209 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1210 (icmp6_nodeinfo & 4) == 0) {
1211 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1212 "a temporary address in %s:%d",
1213 __FILE__, __LINE__));
1216 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1217 ; /* link-local multicast, fine */
1221 /* validate query Subject field. */
1222 qtype = ntohs(ni6->ni_qtype);
1223 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1226 case NI_QTYPE_SUPTYPES:
1228 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1232 case NI_QTYPE_NODEADDR:
1233 switch (ni6->ni_code) {
1234 case ICMP6_NI_SUBJ_IPV6:
1235 #if ICMP6_NI_SUBJ_IPV6 != 0
1239 * backward compatibility - try to accept 03 draft
1240 * format, where no Subject is present.
1242 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1247 #if ICMP6_NI_SUBJ_IPV6 != 0
1248 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1252 if (subjlen != sizeof(sin6.sin6_addr))
1256 * Validate Subject address.
1258 * Not sure what exactly "address belongs to the node"
1259 * means in the spec, is it just unicast, or what?
1261 * At this moment we consider Subject address as
1262 * "belong to the node" if the Subject address equals
1263 * to the IPv6 destination address; validation for
1264 * IPv6 destination address should have done enough
1267 * We do not do proxy at this moment.
1269 /* m_pulldown instead of copy? */
1270 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1271 subjlen, (caddr_t)&sin6.sin6_addr);
1272 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1274 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1275 bzero(&sin6_d, sizeof(sin6_d));
1276 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1277 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1278 sin6_d.sin6_addr = ip6->ip6_dst;
1279 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1281 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1282 subj = (char *)&sin6;
1283 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1287 * XXX if we are to allow other cases, we should really
1288 * be careful about scope here.
1289 * basically, we should disallow queries toward IPv6
1290 * destination X with subject Y, if scope(X) > scope(Y).
1291 * if we allow scope(X) > scope(Y), it will result in
1292 * information leakage across scope boundary.
1296 case ICMP6_NI_SUBJ_FQDN:
1298 * Validate Subject name with gethostname(3).
1300 * The behavior may need some debate, since:
1301 * - we are not sure if the node has FQDN as
1302 * hostname (returned by gethostname(3)).
1303 * - the code does wildcard match for truncated names.
1304 * however, we are not sure if we want to perform
1305 * wildcard match, if gethostname(3) side has
1306 * truncated hostname.
1308 n = ni6_nametodns(hostname, hostnamelen, 0);
1309 if (!n || n->m_next || n->m_len == 0)
1311 IP6_EXTHDR_GET(subj, char *, m,
1312 off + sizeof(struct icmp6_nodeinfo), subjlen);
1315 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1323 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1330 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1333 if ((icmp6_nodeinfo & 1) == 0)
1336 case NI_QTYPE_NODEADDR:
1337 if ((icmp6_nodeinfo & 2) == 0)
1342 /* guess reply length */
1345 break; /* no reply data */
1346 case NI_QTYPE_SUPTYPES:
1347 replylen += sizeof(u_int32_t);
1350 /* XXX will append an mbuf */
1351 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1353 case NI_QTYPE_NODEADDR:
1354 addrs = ni6_addrs(ni6, m, &ifp, subj);
1355 if ((replylen += addrs * (sizeof(struct in6_addr) +
1356 sizeof(u_int32_t))) > MCLBYTES)
1357 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1361 * XXX: We must return a reply with the ICMP6 code
1362 * `unknown Qtype' in this case. However we regard the case
1363 * as an FQDN query for backward compatibility.
1364 * Older versions set a random value to this field,
1365 * so it rarely varies in the defined qtypes.
1366 * But the mechanism is not reliable...
1367 * maybe we should obsolete older versions.
1369 qtype = NI_QTYPE_FQDN;
1370 /* XXX will append an mbuf */
1371 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1376 /* allocate an mbuf to reply. */
1377 MGETHDR(n, MB_DONTWAIT, m->m_type);
1382 M_MOVE_PKTHDR(n, m); /* just for recvif */
1383 if (replylen > MHLEN) {
1384 if (replylen > MCLBYTES) {
1386 * XXX: should we try to allocate more? But MCLBYTES
1387 * is probably much larger than IPV6_MMTU...
1391 MCLGET(n, MB_DONTWAIT);
1392 if ((n->m_flags & M_EXT) == 0) {
1396 n->m_pkthdr.len = n->m_len = replylen;
1398 /* copy mbuf header and IPv6 + Node Information base headers */
1399 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1400 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1401 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1403 /* qtype dependent procedure */
1406 nni6->ni_code = ICMP6_NI_SUCCESS;
1409 case NI_QTYPE_SUPTYPES:
1412 nni6->ni_code = ICMP6_NI_SUCCESS;
1413 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1414 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1415 v = (u_int32_t)htonl(0x0000000f);
1416 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1420 nni6->ni_code = ICMP6_NI_SUCCESS;
1421 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1422 sizeof(struct ip6_hdr) +
1423 sizeof(struct icmp6_nodeinfo));
1424 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1425 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1427 * XXX do we really have FQDN in variable "hostname"?
1429 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1430 if (n->m_next == NULL)
1432 /* XXX we assume that n->m_next is not a chain */
1433 if (n->m_next->m_next != NULL)
1435 n->m_pkthdr.len += n->m_next->m_len;
1437 case NI_QTYPE_NODEADDR:
1441 nni6->ni_code = ICMP6_NI_SUCCESS;
1442 n->m_pkthdr.len = n->m_len =
1443 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1444 lenlim = M_TRAILINGSPACE(n);
1445 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1446 /* XXX: reset mbuf length */
1447 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1448 sizeof(struct icmp6_nodeinfo) + copied;
1452 break; /* XXX impossible! */
1455 nni6->ni_type = ICMP6_NI_REPLY;
1468 * make a mbuf with DNS-encoded string. no compression support.
1470 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1471 * treated as truncated name (two \0 at the end). this is a wild guess.
1473 static struct mbuf *
1474 ni6_nametodns(const char *name, int namelen,
1475 int old) /* return pascal string if non-zero */
1487 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1488 MGET(m, MB_DONTWAIT, MT_DATA);
1489 if (m && len > MLEN) {
1490 MCLGET(m, MB_DONTWAIT);
1491 if ((m->m_flags & M_EXT) == 0)
1500 *mtod(m, char *) = namelen;
1501 bcopy(name, mtod(m, char *) + 1, namelen);
1505 cp = mtod(m, char *);
1506 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1508 /* if not certain about my name, return empty buffer */
1513 * guess if it looks like shortened hostname, or FQDN.
1514 * shortened hostname needs two trailing "\0".
1517 for (p = name; p < name + namelen; p++) {
1518 if (*p && *p == '.')
1527 while (cp < ep && p < name + namelen) {
1529 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1531 /* result does not fit into mbuf */
1532 if (cp + i + 1 >= ep)
1535 * DNS label length restriction, RFC1035 page 8.
1536 * "i == 0" case is included here to avoid returning
1537 * 0-length label on "foo..bar".
1539 if (i <= 0 || i >= 64)
1545 if (p < name + namelen && *p == '.')
1549 if (cp + nterm >= ep)
1553 m->m_len = cp - mtod(m, char *);
1557 panic("should not reach here");
1567 * check if two DNS-encoded string matches. takes care of truncated
1568 * form (with \0\0 at the end). no compression support.
1569 * XXX upper/lowercase match (see RFC2065)
1572 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1574 const char *a0, *b0;
1577 /* simplest case - need validation? */
1578 if (alen == blen && bcmp(a, b, alen) == 0)
1584 /* termination is mandatory */
1585 if (alen < 2 || blen < 2)
1587 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1592 while (a - a0 < alen && b - b0 < blen) {
1593 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1596 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1598 /* we don't support compression yet */
1599 if (a[0] >= 64 || b[0] >= 64)
1602 /* truncated case */
1603 if (a[0] == 0 && a - a0 == alen - 1)
1605 if (b[0] == 0 && b - b0 == blen - 1)
1607 if (a[0] == 0 || b[0] == 0)
1613 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1615 if (bcmp(a + 1, b + 1, l) != 0)
1622 if (a - a0 == alen && b - b0 == blen)
1629 * calculate the number of addresses to be returned in the node info reply.
1632 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1636 struct in6_ifaddr *ifa6;
1638 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1639 int addrs = 0, addrsofif, iffound = 0;
1640 int niflags = ni6->ni_flags;
1642 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1643 switch (ni6->ni_code) {
1644 case ICMP6_NI_SUBJ_IPV6:
1645 if (subj == NULL) /* must be impossible... */
1647 subj_ip6 = (struct sockaddr_in6 *)subj;
1651 * XXX: we only support IPv6 subject address for
1658 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1661 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
1663 if (ifa->ifa_addr->sa_family != AF_INET6)
1665 ifa6 = (struct in6_ifaddr *)ifa;
1667 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1668 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1669 &ifa6->ia_addr.sin6_addr))
1673 * IPv4-mapped addresses can only be returned by a
1674 * Node Information proxy, since they represent
1675 * addresses of IPv4-only nodes, which perforce do
1676 * not implement this protocol.
1677 * [icmp-name-lookups-07, Section 5.4]
1678 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1679 * this function at this moment.
1682 /* What do we have to do about ::1? */
1683 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1684 case IPV6_ADDR_SCOPE_LINKLOCAL:
1685 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1688 case IPV6_ADDR_SCOPE_SITELOCAL:
1689 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1692 case IPV6_ADDR_SCOPE_GLOBAL:
1693 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1701 * check if anycast is okay.
1702 * XXX: just experimental. not in the spec.
1704 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1705 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1706 continue; /* we need only unicast addresses */
1707 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1708 (icmp6_nodeinfo & 4) == 0) {
1711 addrsofif++; /* count the address */
1725 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1726 struct ifnet *ifp0, int resid)
1728 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1729 struct in6_ifaddr *ifa6;
1731 struct ifnet *ifp_dep = NULL;
1732 int copied = 0, allow_deprecated = 0;
1733 u_char *cp = (u_char *)(nni6 + 1);
1734 int niflags = ni6->ni_flags;
1737 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1738 return(0); /* needless to copy */
1742 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1744 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
1745 if (ifa->ifa_addr->sa_family != AF_INET6)
1747 ifa6 = (struct in6_ifaddr *)ifa;
1749 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1750 allow_deprecated == 0) {
1752 * prefererred address should be put before
1753 * deprecated addresses.
1756 /* record the interface for later search */
1757 if (ifp_dep == NULL)
1762 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1763 allow_deprecated != 0)
1764 continue; /* we now collect deprecated addrs */
1766 /* What do we have to do about ::1? */
1767 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1768 case IPV6_ADDR_SCOPE_LINKLOCAL:
1769 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1772 case IPV6_ADDR_SCOPE_SITELOCAL:
1773 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1776 case IPV6_ADDR_SCOPE_GLOBAL:
1777 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1785 * check if anycast is okay.
1786 * XXX: just experimental. not in the spec.
1788 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1789 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1791 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1792 (icmp6_nodeinfo & 4) == 0) {
1796 /* now we can copy the address */
1797 if (resid < sizeof(struct in6_addr) +
1798 sizeof(u_int32_t)) {
1800 * We give up much more copy.
1801 * Set the truncate flag and return.
1804 NI_NODEADDR_FLAG_TRUNCATE;
1809 * Set the TTL of the address.
1810 * The TTL value should be one of the following
1811 * according to the specification:
1813 * 1. The remaining lifetime of a DHCP lease on the
1815 * 2. The remaining Valid Lifetime of a prefix from
1816 * which the address was derived through Stateless
1817 * Autoconfiguration.
1819 * Note that we currently do not support stateful
1820 * address configuration by DHCPv6, so the former
1821 * case can't happen.
1823 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1824 ltime = ND6_INFINITE_LIFETIME;
1826 if (ifa6->ia6_lifetime.ia6t_expire >
1828 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1833 bcopy(<ime, cp, sizeof(u_int32_t));
1834 cp += sizeof(u_int32_t);
1836 /* copy the address itself */
1837 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1838 sizeof(struct in6_addr));
1839 /* XXX: KAME link-local hack; remove ifindex */
1840 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1841 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1842 cp += sizeof(struct in6_addr);
1844 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1845 copied += (sizeof(struct in6_addr) +
1848 if (ifp0) /* we need search only on the specified IF */
1852 if (allow_deprecated == 0 && ifp_dep != NULL) {
1854 allow_deprecated = 1;
1863 * XXX almost dup'ed code with rip6_input.
1866 icmp6_rip6_input(struct mbuf **mp, int off)
1868 struct mbuf *m = *mp;
1869 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1870 struct in6pcb *in6p;
1871 struct in6pcb *last = NULL;
1872 struct sockaddr_in6 rip6src;
1873 struct icmp6_hdr *icmp6;
1874 struct mbuf *opts = NULL;
1876 #ifndef PULLDOWN_TEST
1877 /* this is assumed to be safe. */
1878 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1880 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1881 if (icmp6 == NULL) {
1882 /* m is already reclaimed */
1883 return IPPROTO_DONE;
1887 bzero(&rip6src, sizeof(rip6src));
1888 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1889 rip6src.sin6_family = AF_INET6;
1890 /* KAME hack: recover scopeid */
1891 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1893 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1895 if (in6p->inp_flags & INP_PLACEMARKER)
1897 if ((in6p->inp_vflag & INP_IPV6) == 0)
1899 #ifdef HAVE_NRL_INPCB
1900 if (!(in6p->in6p_flags & INP_IPV6))
1903 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1905 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1906 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1908 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1909 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1911 if (in6p->in6p_icmp6filt
1912 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1913 in6p->in6p_icmp6filt))
1917 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1918 if (last->in6p_flags & IN6P_CONTROLOPTS)
1919 ip6_savecontrol(last, &opts, ip6, n);
1920 /* strip intermediate headers */
1922 if (sbappendaddr(&last->in6p_socket->so_rcv,
1923 (struct sockaddr *)&rip6src,
1925 /* should notify about lost packet */
1931 sorwakeup(last->in6p_socket);
1938 if (last->in6p_flags & IN6P_CONTROLOPTS)
1939 ip6_savecontrol(last, &opts, ip6, m);
1940 /* strip intermediate headers */
1942 if (sbappendaddr(&last->in6p_socket->so_rcv,
1943 (struct sockaddr *)&rip6src, m, opts) == 0) {
1948 sorwakeup(last->in6p_socket);
1951 ip6stat.ip6s_delivered--;
1953 return IPPROTO_DONE;
1957 * Reflect the ip6 packet back to the source.
1958 * OFF points to the icmp6 header, counted from the top of the mbuf.
1961 icmp6_reflect(struct mbuf *m, size_t off)
1963 struct ip6_hdr *ip6;
1964 struct icmp6_hdr *icmp6;
1965 struct in6_ifaddr *ia;
1966 struct in6_addr t, *src = 0;
1969 struct ifnet *outif = NULL;
1970 struct sockaddr_in6 sa6_src, sa6_dst;
1971 #ifdef COMPAT_RFC1885
1972 int mtu = IPV6_MMTU;
1973 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1976 /* too short to reflect */
1977 if (off < sizeof(struct ip6_hdr)) {
1979 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1980 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1981 __FILE__, __LINE__));
1986 * If there are extra headers between IPv6 and ICMPv6, strip
1987 * off that header first.
1990 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1991 panic("assumption failed in icmp6_reflect");
1993 if (off > sizeof(struct ip6_hdr)) {
1995 struct ip6_hdr nip6;
1997 l = off - sizeof(struct ip6_hdr);
1998 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2000 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2002 if ((m = m_pullup(m, l)) == NULL)
2005 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2006 } else /* off == sizeof(struct ip6_hdr) */ {
2008 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2010 if ((m = m_pullup(m, l)) == NULL)
2014 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2015 ip6 = mtod(m, struct ip6_hdr *);
2016 ip6->ip6_nxt = IPPROTO_ICMPV6;
2017 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2018 type = icmp6->icmp6_type; /* keep type for statistics */
2019 code = icmp6->icmp6_code; /* ditto. */
2023 * ip6_input() drops a packet if its src is multicast.
2024 * So, the src is never multicast.
2026 ip6->ip6_dst = ip6->ip6_src;
2029 * XXX: make sure to embed scope zone information, using
2030 * already embedded IDs or the received interface (if any).
2031 * Note that rcvif may be NULL.
2032 * TODO: scoped routing case (XXX).
2034 bzero(&sa6_src, sizeof(sa6_src));
2035 sa6_src.sin6_family = AF_INET6;
2036 sa6_src.sin6_len = sizeof(sa6_src);
2037 sa6_src.sin6_addr = ip6->ip6_dst;
2038 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
2039 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2040 bzero(&sa6_dst, sizeof(sa6_dst));
2041 sa6_dst.sin6_family = AF_INET6;
2042 sa6_dst.sin6_len = sizeof(sa6_dst);
2043 sa6_dst.sin6_addr = t;
2044 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2045 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2047 #ifdef COMPAT_RFC1885
2050 * RFC 1885 requires that echo reply should be truncated if it
2051 * does not fit in with (return) path MTU, but the description was
2052 * removed in the new spec.
2054 if (icmp6_reflect_rt.ro_rt == 0 ||
2055 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2056 if (icmp6_reflect_rt.ro_rt) {
2057 RTFREE(icmp6_reflect_rt.ro_rt);
2058 icmp6_reflect_rt.ro_rt = 0;
2060 bzero(sin6, sizeof(*sin6));
2061 sin6->sin6_family = PF_INET6;
2062 sin6->sin6_len = sizeof(struct sockaddr_in6);
2063 sin6->sin6_addr = ip6->ip6_dst;
2065 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2069 if (icmp6_reflect_rt.ro_rt == 0)
2072 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2073 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2074 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2076 if (mtu < m->m_pkthdr.len) {
2077 plen -= (m->m_pkthdr.len - mtu);
2078 m_adj(m, mtu - m->m_pkthdr.len);
2082 * If the incoming packet was addressed directly to us(i.e. unicast),
2083 * use dst as the src for the reply.
2084 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2085 * (for example) when we encounter an error while forwarding procedure
2086 * destined to a duplicated address of ours.
2088 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2089 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2090 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2094 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2096 * This is the case if the dst is our link-local address
2097 * and the sender is also ourselves.
2104 struct route_in6 ro;
2107 * This case matches to multicasts, our anycast, or unicasts
2108 * that we do not own. Select a source address based on the
2109 * source address of the erroneous packet.
2111 bzero(&ro, sizeof(ro));
2112 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e);
2114 RTFREE(ro.ro_rt); /* XXX: we could use this */
2117 "icmp6_reflect: source can't be determined: "
2118 "dst=%s, error=%d\n",
2119 ip6_sprintf(&sa6_src.sin6_addr), e));
2124 ip6->ip6_src = *src;
2127 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2128 ip6->ip6_vfc |= IPV6_VERSION;
2129 ip6->ip6_nxt = IPPROTO_ICMPV6;
2130 if (m->m_pkthdr.rcvif) {
2131 /* XXX: This may not be the outgoing interface */
2132 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2134 ip6->ip6_hlim = ip6_defhlim;
2136 icmp6->icmp6_cksum = 0;
2137 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2138 sizeof(struct ip6_hdr), plen);
2141 * XXX option handling
2144 m->m_flags &= ~(M_BCAST|M_MCAST);
2146 #ifdef COMPAT_RFC1885
2147 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2149 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2152 icmp6_ifoutstat_inc(outif, type, code);
2162 icmp6_fasttimo(void)
2169 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2170 struct in6_addr *tgt6)
2172 static char buf[1024];
2173 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2174 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2179 icmp6_redirect_input(struct mbuf *m, int off)
2181 struct ifnet *ifp = m->m_pkthdr.rcvif;
2182 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2183 struct nd_redirect *nd_rd;
2184 int icmp6len = ntohs(ip6->ip6_plen);
2185 char *lladdr = NULL;
2187 u_char *redirhdr = NULL;
2188 int redirhdrlen = 0;
2189 struct rtentry *rt = NULL;
2192 struct in6_addr src6 = ip6->ip6_src;
2193 struct in6_addr redtgt6;
2194 struct in6_addr reddst6;
2195 union nd_opts ndopts;
2200 /* XXX if we are router, we don't update route by icmp6 redirect */
2203 if (!icmp6_rediraccept)
2206 #ifndef PULLDOWN_TEST
2207 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2208 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2210 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2211 if (nd_rd == NULL) {
2212 icmp6stat.icp6s_tooshort++;
2216 redtgt6 = nd_rd->nd_rd_target;
2217 reddst6 = nd_rd->nd_rd_dst;
2219 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2220 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2221 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2222 reddst6.s6_addr16[1] = htons(ifp->if_index);
2225 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2227 "ICMP6 redirect sent from %s rejected; "
2228 "must be from linklocal\n", ip6_sprintf(&src6)));
2231 if (ip6->ip6_hlim != 255) {
2233 "ICMP6 redirect sent from %s rejected; "
2234 "hlim=%d (must be 255)\n",
2235 ip6_sprintf(&src6), ip6->ip6_hlim));
2239 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2240 struct sockaddr_in6 sin6;
2241 struct in6_addr *gw6;
2243 bzero(&sin6, sizeof(sin6));
2244 sin6.sin6_family = AF_INET6;
2245 sin6.sin6_len = sizeof(struct sockaddr_in6);
2246 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2247 rt = rtpurelookup((struct sockaddr *)&sin6);
2249 if (rt->rt_gateway == NULL ||
2250 rt->rt_gateway->sa_family != AF_INET6) {
2252 "ICMP6 redirect rejected; no route "
2253 "with inet6 gateway found for redirect dst: %s\n",
2254 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2259 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2260 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2262 "ICMP6 redirect rejected; "
2263 "not equal to gw-for-src=%s (must be same): "
2266 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2272 "ICMP6 redirect rejected; "
2273 "no route found for redirect dst: %s\n",
2274 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2280 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2282 "ICMP6 redirect rejected; "
2283 "redirect dst must be unicast: %s\n",
2284 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2288 is_router = is_onlink = 0;
2289 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2290 is_router = 1; /* router case */
2291 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2292 is_onlink = 1; /* on-link destination case */
2293 if (!is_router && !is_onlink) {
2295 "ICMP6 redirect rejected; "
2296 "neither router case nor onlink case: %s\n",
2297 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2300 /* validation passed */
2302 icmp6len -= sizeof(*nd_rd);
2303 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2304 if (nd6_options(&ndopts) < 0) {
2305 nd6log((LOG_INFO, "icmp6_redirect_input: "
2306 "invalid ND option, rejected: %s\n",
2307 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2308 /* nd6_options have incremented stats */
2312 if (ndopts.nd_opts_tgt_lladdr) {
2313 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2314 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2317 if (ndopts.nd_opts_rh) {
2318 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2319 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2322 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2324 "icmp6_redirect_input: lladdrlen mismatch for %s "
2325 "(if %d, icmp6 packet %d): %s\n",
2326 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2327 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2332 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2333 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2335 if (!is_onlink) { /* better router case. perform rtredirect. */
2336 /* perform rtredirect */
2337 struct sockaddr_in6 sdst;
2338 struct sockaddr_in6 sgw;
2339 struct sockaddr_in6 ssrc;
2341 bzero(&sdst, sizeof(sdst));
2342 bzero(&sgw, sizeof(sgw));
2343 bzero(&ssrc, sizeof(ssrc));
2344 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2345 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2346 sizeof(struct sockaddr_in6);
2347 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2348 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2349 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2350 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2351 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2352 (struct sockaddr *)&ssrc,
2353 (struct rtentry **)NULL);
2355 /* finally update cached route in each socket via pfctlinput */
2357 struct sockaddr_in6 sdst;
2359 bzero(&sdst, sizeof(sdst));
2360 sdst.sin6_family = AF_INET6;
2361 sdst.sin6_len = sizeof(struct sockaddr_in6);
2362 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2363 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2365 key_sa_routechange((struct sockaddr *)&sdst);
2374 icmp6stat.icp6s_badredirect++;
2379 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2381 struct ifnet *ifp; /* my outgoing interface */
2382 struct in6_addr *ifp_ll6;
2383 struct in6_addr *router_ll6;
2384 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2385 struct mbuf *m = NULL; /* newly allocated one */
2386 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2387 struct nd_redirect *nd_rd;
2390 struct ifnet *outif = NULL;
2391 struct sockaddr_in6 src_sa;
2393 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2395 /* if we are not router, we don't send icmp6 redirect */
2396 if (!ip6_forwarding || ip6_accept_rtadv)
2400 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2405 * the source address must identify a neighbor, and
2406 * the destination address must not be a multicast address
2407 * [RFC 2461, sec 8.2]
2409 sip6 = mtod(m0, struct ip6_hdr *);
2410 bzero(&src_sa, sizeof(src_sa));
2411 src_sa.sin6_family = AF_INET6;
2412 src_sa.sin6_len = sizeof(src_sa);
2413 src_sa.sin6_addr = sip6->ip6_src;
2414 /* we don't currently use sin6_scope_id, but eventually use it */
2415 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2416 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2418 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2419 goto fail; /* what should we do here? */
2422 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2426 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2427 * we almost always ask for an mbuf cluster for simplicity.
2428 * (MHLEN < IPV6_MMTU is almost always true)
2430 #if IPV6_MMTU >= MCLBYTES
2431 # error assumption failed about IPV6_MMTU and MCLBYTES
2433 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
2434 if (m && IPV6_MMTU >= MHLEN)
2435 MCLGET(m, MB_DONTWAIT);
2438 m->m_pkthdr.rcvif = NULL;
2440 maxlen = M_TRAILINGSPACE(m);
2441 maxlen = min(IPV6_MMTU, maxlen);
2442 /* just for safety */
2443 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2444 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2449 /* get ip6 linklocal address for ifp(my outgoing interface). */
2450 struct in6_ifaddr *ia;
2451 if ((ia = in6ifa_ifpforlinklocal(ifp,
2453 IN6_IFF_ANYCAST)) == NULL)
2455 ifp_ll6 = &ia->ia_addr.sin6_addr;
2458 /* get ip6 linklocal address for the router. */
2459 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2460 struct sockaddr_in6 *sin6;
2461 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2462 router_ll6 = &sin6->sin6_addr;
2463 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2464 router_ll6 = (struct in6_addr *)NULL;
2466 router_ll6 = (struct in6_addr *)NULL;
2469 ip6 = mtod(m, struct ip6_hdr *);
2471 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2472 ip6->ip6_vfc |= IPV6_VERSION;
2473 /* ip6->ip6_plen will be set later */
2474 ip6->ip6_nxt = IPPROTO_ICMPV6;
2475 ip6->ip6_hlim = 255;
2476 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2477 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2478 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2481 nd_rd = (struct nd_redirect *)(ip6 + 1);
2482 nd_rd->nd_rd_type = ND_REDIRECT;
2483 nd_rd->nd_rd_code = 0;
2484 nd_rd->nd_rd_reserved = 0;
2485 if (rt->rt_flags & RTF_GATEWAY) {
2487 * nd_rd->nd_rd_target must be a link-local address in
2488 * better router cases.
2492 bcopy(router_ll6, &nd_rd->nd_rd_target,
2493 sizeof(nd_rd->nd_rd_target));
2494 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2495 sizeof(nd_rd->nd_rd_dst));
2497 /* make sure redtgt == reddst */
2498 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2499 sizeof(nd_rd->nd_rd_target));
2500 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2501 sizeof(nd_rd->nd_rd_dst));
2504 p = (u_char *)(nd_rd + 1);
2510 /* target lladdr option */
2511 struct rtentry *rt_router = NULL;
2513 struct sockaddr_dl *sdl;
2514 struct nd_opt_hdr *nd_opt;
2517 rt_router = nd6_lookup(router_ll6, 0, ifp);
2520 len = sizeof(*nd_opt) + ifp->if_addrlen;
2521 len = (len + 7) & ~7; /* round by 8 */
2523 if (len + (p - (u_char *)ip6) > maxlen)
2525 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2526 (rt_router->rt_flags & RTF_LLINFO) &&
2527 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2528 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2530 nd_opt = (struct nd_opt_hdr *)p;
2531 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2532 nd_opt->nd_opt_len = len >> 3;
2533 lladdr = (char *)(nd_opt + 1);
2534 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2540 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2542 /* just to be safe */
2543 #ifdef M_DECRYPTED /*not openbsd*/
2544 if (m0->m_flags & M_DECRYPTED)
2547 if (p - (u_char *)ip6 > maxlen)
2551 /* redirected header option */
2553 struct nd_opt_rd_hdr *nd_opt_rh;
2556 * compute the maximum size for icmp6 redirect header option.
2557 * XXX room for auth header?
2559 len = maxlen - (p - (u_char *)ip6);
2562 /* This is just for simplicity. */
2563 if (m0->m_pkthdr.len != m0->m_len) {
2565 m_freem(m0->m_next);
2568 m0->m_pkthdr.len = m0->m_len;
2572 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2573 * about padding/truncate rule for the original IP packet.
2574 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2575 * - "attach as much as possible" is the goal
2576 * - pad if not aligned (original size can be guessed by original
2578 * Following code adds the padding if it is simple enough,
2579 * and truncates if not.
2581 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2582 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2584 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2585 /* not enough room, truncate */
2586 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2588 /* enough room, pad or truncate */
2591 extra = m0->m_pkthdr.len % 8;
2593 /* pad if easy enough, truncate if not */
2594 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2596 m0->m_len += (8 - extra);
2597 m0->m_pkthdr.len += (8 - extra);
2600 m0->m_pkthdr.len -= extra;
2604 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2605 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2608 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2609 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2610 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2611 nd_opt_rh->nd_opt_rh_len = len >> 3;
2612 p += sizeof(*nd_opt_rh);
2613 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2615 /* connect m0 to m */
2617 m->m_pkthdr.len = m->m_len + m0->m_len;
2621 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2622 sip6->ip6_src.s6_addr16[1] = 0;
2623 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2624 sip6->ip6_dst.s6_addr16[1] = 0;
2626 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2627 ip6->ip6_src.s6_addr16[1] = 0;
2628 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2629 ip6->ip6_dst.s6_addr16[1] = 0;
2631 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2632 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2633 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2634 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2636 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2638 nd_rd->nd_rd_cksum = 0;
2640 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2642 /* send the packet to outside... */
2643 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2645 icmp6_ifstat_inc(outif, ifs6_out_msg);
2646 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2648 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2659 #ifdef HAVE_NRL_INPCB
2660 #define in6pcb inpcb
2661 #define in6p_icmp6filt inp_icmp6filt
2664 * ICMPv6 socket option processing.
2667 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2671 struct inpcb *inp = so->so_pcb;
2672 int level, op, optname;
2675 level = sopt->sopt_level;
2676 op = sopt->sopt_dir;
2677 optname = sopt->sopt_name;
2678 optlen = sopt->sopt_valsize;
2680 level = op = optname = optlen = 0;
2682 if (level != IPPROTO_ICMPV6) {
2691 struct icmp6_filter *p;
2693 if (optlen != sizeof(*p)) {
2697 if (inp->in6p_icmp6filt == NULL) {
2701 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
2707 error = ENOPROTOOPT;
2716 if (inp->in6p_icmp6filt == NULL) {
2720 error = sooptcopyout(sopt, inp->in6p_icmp6filt,
2721 sizeof(struct icmp6_filter));
2726 error = ENOPROTOOPT;
2734 #ifdef HAVE_NRL_INPCB
2736 #undef in6p_icmp6filt
2739 #ifndef HAVE_PPSRATECHECK
2741 #define timersub(tvp, uvp, vvp) \
2743 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2744 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2745 if ((vvp)->tv_usec < 0) { \
2747 (vvp)->tv_usec += 1000000; \
2753 * ppsratecheck(): packets (or events) per second limitation.
2756 ppsratecheck(struct timeval *lasttime, int *curpps,
2757 int maxpps) /* maximum pps allowed */
2759 struct timeval tv, delta;
2764 timersub(&tv, lasttime, &delta);
2767 * Check for 0,0 so that the message will be seen at least once.
2768 * If more than one second has passed since the last update of
2769 * lasttime, reset the counter.
2771 * We do increment *curpps even in *curpps < maxpps case, as some may
2772 * try to use *curpps for stat purposes as well.
2774 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2775 delta.tv_sec >= 1) {
2779 } else if (maxpps < 0)
2781 else if (*curpps < maxpps)
2786 #if 1 /* DIAGNOSTIC? */
2787 /* be careful about wrap-around */
2788 if (*curpps + 1 > *curpps)
2789 *curpps = *curpps + 1;
2792 * assume that there's not too many calls to this function.
2793 * not sure if the assumption holds, as it depends on *caller's*
2794 * behavior, not the behavior of this function.
2795 * IMHO it is wrong to make assumption on the caller's behavior,
2796 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2798 *curpps = *curpps + 1;
2806 * Perform rate limit check.
2807 * Returns 0 if it is okay to send the icmp6 packet.
2808 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2811 * XXX per-destination/type check necessary?
2814 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2815 const int type, /* not used at this moment */
2816 const int code) /* not used at this moment */
2820 ret = 0; /* okay to send */
2823 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2825 /* The packet is subject to rate limit */