1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */
2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Copyright (c) 1982, 1986, 1988, 1993
35 * The Regents of the University of California. All rights reserved.
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/malloc.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/socketops.h>
81 #include <sys/kernel.h>
82 #include <sys/syslog.h>
83 #include <sys/domain.h>
85 #include <sys/thread2.h>
86 #include <sys/msgport2.h>
89 #include <net/route.h>
90 #include <net/if_dl.h>
91 #include <net/if_types.h>
93 #include <netinet/in.h>
94 #include <netinet/in_var.h>
95 #include <netinet/ip6.h>
96 #include <netinet6/ip6_var.h>
97 #include <netinet/icmp6.h>
98 #include <netinet6/mld6_var.h>
99 #include <netinet/in_pcb.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet6/nd6.h>
102 #include <netinet6/in6_ifattach.h>
103 #include <netinet6/ip6protosw.h>
106 #include <netinet6/ipsec.h>
107 #include <netproto/key/key.h>
111 #include <netproto/ipsec/ipsec.h>
112 #include <netproto/ipsec/key.h>
116 #include <net/net_osdep.h>
118 #ifdef HAVE_NRL_INPCB
121 #define in6p_laddr inp_laddr6
122 #define in6p_faddr inp_faddr6
123 #define in6p_icmp6filt inp_icmp6filt
124 #define in6p_route inp_route
125 #define in6p_socket inp_socket
126 #define in6p_flags inp_flags
127 #define in6p_moptions inp_moptions6
128 #define in6p_outputopts inp_outputopts6
129 #define in6p_ip6 inp_ipv6
130 #define in6p_flowinfo inp_flowinfo
131 #define in6p_sp inp_sp
132 #define in6p_next inp_next
133 #define in6p_prev inp_prev
135 #define in6_pcbdetach in_pcbdetach
136 #define in6_rtchange in_rtchange
139 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
142 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
146 * ppratecheck() is available, so define it here.
148 #define HAVE_PPSRATECHECK
150 extern struct domain inet6domain;
151 extern struct protosw inet6sw[];
152 extern u_char ip6_protox[];
154 struct icmp6stat icmp6stat;
156 extern struct inpcbinfo ripcbinfo;
157 extern int icmp6errppslim;
158 static int icmp6errpps_count = 0;
159 static struct timeval icmp6errppslim_last;
160 extern int icmp6_nodeinfo;
162 static void icmp6_errcount (struct icmp6errstat *, int, int);
163 static int icmp6_rip6_input (struct mbuf **, int);
164 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
165 static const char *icmp6_redirect_diag (struct in6_addr *,
166 struct in6_addr *, struct in6_addr *);
167 #ifndef HAVE_PPSRATECHECK
168 static int ppsratecheck (struct timeval *, int *, int);
170 static struct mbuf *ni6_input (struct mbuf *, int);
171 static struct mbuf *ni6_nametodns (const char *, int, int);
172 static int ni6_dnsmatch (const char *, int, const char *, int);
173 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
174 struct ifnet **, char *);
175 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
176 struct ifnet *, int);
177 static int icmp6_notify_error (struct mbuf *, int, int, int);
179 #ifdef COMPAT_RFC1885
180 static struct route_in6 icmp6_reflect_rt;
191 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
194 case ICMP6_DST_UNREACH:
196 case ICMP6_DST_UNREACH_NOROUTE:
197 stat->icp6errs_dst_unreach_noroute++;
199 case ICMP6_DST_UNREACH_ADMIN:
200 stat->icp6errs_dst_unreach_admin++;
202 case ICMP6_DST_UNREACH_BEYONDSCOPE:
203 stat->icp6errs_dst_unreach_beyondscope++;
205 case ICMP6_DST_UNREACH_ADDR:
206 stat->icp6errs_dst_unreach_addr++;
208 case ICMP6_DST_UNREACH_NOPORT:
209 stat->icp6errs_dst_unreach_noport++;
213 case ICMP6_PACKET_TOO_BIG:
214 stat->icp6errs_packet_too_big++;
216 case ICMP6_TIME_EXCEEDED:
218 case ICMP6_TIME_EXCEED_TRANSIT:
219 stat->icp6errs_time_exceed_transit++;
221 case ICMP6_TIME_EXCEED_REASSEMBLY:
222 stat->icp6errs_time_exceed_reassembly++;
226 case ICMP6_PARAM_PROB:
228 case ICMP6_PARAMPROB_HEADER:
229 stat->icp6errs_paramprob_header++;
231 case ICMP6_PARAMPROB_NEXTHEADER:
232 stat->icp6errs_paramprob_nextheader++;
234 case ICMP6_PARAMPROB_OPTION:
235 stat->icp6errs_paramprob_option++;
240 stat->icp6errs_redirect++;
243 stat->icp6errs_unknown++;
247 * Generate an error packet of type error in response to bad IP6 packet.
250 icmp6_error(struct mbuf *m, int type, int code, int param)
252 struct ip6_hdr *oip6, *nip6;
253 struct icmp6_hdr *icmp6;
258 icmp6stat.icp6s_error++;
260 /* count per-type-code statistics */
261 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
263 #ifdef M_DECRYPTED /*not openbsd*/
264 if (m->m_flags & M_DECRYPTED) {
265 icmp6stat.icp6s_canterror++;
270 #ifndef PULLDOWN_TEST
271 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
273 if (m->m_len < sizeof(struct ip6_hdr)) {
274 m = m_pullup(m, sizeof(struct ip6_hdr));
279 oip6 = mtod(m, struct ip6_hdr *);
282 * Multicast destination check. For unrecognized option errors,
283 * this check has already done in ip6_unknown_opt(), so we can
284 * check only for other errors.
286 if ((m->m_flags & (M_BCAST|M_MCAST) ||
287 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
288 (type != ICMP6_PACKET_TOO_BIG &&
289 (type != ICMP6_PARAM_PROB ||
290 code != ICMP6_PARAMPROB_OPTION)))
293 /* Source address check. XXX: the case of anycast source? */
294 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
295 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
299 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
303 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
304 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
305 struct icmp6_hdr *icp;
307 #ifndef PULLDOWN_TEST
308 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
309 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
311 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
314 icmp6stat.icp6s_tooshort++;
318 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
319 icp->icmp6_type == ND_REDIRECT) {
322 * Special case: for redirect (which is
323 * informational) we must not send icmp6 error.
325 icmp6stat.icp6s_canterror++;
328 /* ICMPv6 informational - send the error */
331 /* non-ICMPv6 - send the error */
334 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
336 /* Finally, do rate limitation check. */
337 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
338 icmp6stat.icp6s_toofreq++;
343 * OK, ICMP6 can be generated.
346 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
347 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
349 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
350 M_PREPEND(m, preplen, MB_DONTWAIT);
351 if (m && m->m_len < preplen)
352 m = m_pullup(m, preplen);
354 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
358 nip6 = mtod(m, struct ip6_hdr *);
359 nip6->ip6_src = oip6->ip6_src;
360 nip6->ip6_dst = oip6->ip6_dst;
362 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
363 oip6->ip6_src.s6_addr16[1] = 0;
364 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
365 oip6->ip6_dst.s6_addr16[1] = 0;
367 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
368 icmp6->icmp6_type = type;
369 icmp6->icmp6_code = code;
370 icmp6->icmp6_pptr = htonl((u_int32_t)param);
373 * icmp6_reflect() is designed to be in the input path.
374 * icmp6_error() can be called from both input and outut path,
375 * and if we are in output path rcvif could contain bogus value.
376 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
377 * information in ip header (nip6).
379 m->m_pkthdr.rcvif = NULL;
381 icmp6stat.icp6s_outhist[type]++;
382 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
388 * If we can't tell wheter or not we can generate ICMP6, free it.
394 * Process a received ICMP6 message.
397 icmp6_input(struct mbuf **mp, int *offp, int proto)
399 struct mbuf *m = *mp, *n;
400 struct ip6_hdr *ip6, *nip6;
401 struct icmp6_hdr *icmp6, *nicmp6;
403 int icmp6len = m->m_pkthdr.len - *offp;
406 #ifndef PULLDOWN_TEST
407 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
408 /* m might change if M_LOOP. So, call mtod after this */
412 * Locate icmp6 structure in mbuf, and check
413 * that not corrupted and of at least minimum length
416 ip6 = mtod(m, struct ip6_hdr *);
417 if (icmp6len < sizeof(struct icmp6_hdr)) {
418 icmp6stat.icp6s_tooshort++;
423 * calculate the checksum
425 #ifndef PULLDOWN_TEST
426 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
428 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
430 icmp6stat.icp6s_tooshort++;
434 code = icmp6->icmp6_code;
436 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
438 "ICMP6 checksum error(%d|%x) %s\n",
439 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
440 icmp6stat.icp6s_checksum++;
444 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
446 * Deliver very specific ICMP6 type only.
447 * This is important to deilver TOOBIG. Otherwise PMTUD
450 switch (icmp6->icmp6_type) {
451 case ICMP6_DST_UNREACH:
452 case ICMP6_PACKET_TOO_BIG:
453 case ICMP6_TIME_EXCEEDED:
460 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
461 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
462 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
463 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
465 switch (icmp6->icmp6_type) {
466 case ICMP6_DST_UNREACH:
467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
469 case ICMP6_DST_UNREACH_NOROUTE:
470 code = PRC_UNREACH_NET;
472 case ICMP6_DST_UNREACH_ADMIN:
473 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
474 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
476 case ICMP6_DST_UNREACH_ADDR:
479 #ifdef COMPAT_RFC1885
480 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
481 code = PRC_UNREACH_SRCFAIL;
484 case ICMP6_DST_UNREACH_BEYONDSCOPE:
485 /* I mean "source address was incorrect." */
486 code = PRC_PARAMPROB;
489 case ICMP6_DST_UNREACH_NOPORT:
490 code = PRC_UNREACH_PORT;
498 case ICMP6_PACKET_TOO_BIG:
499 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
506 * Updating the path MTU will be done after examining
507 * intermediate extension headers.
512 case ICMP6_TIME_EXCEEDED:
513 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
515 case ICMP6_TIME_EXCEED_TRANSIT:
516 case ICMP6_TIME_EXCEED_REASSEMBLY:
517 code += PRC_TIMXCEED_INTRANS;
525 case ICMP6_PARAM_PROB:
526 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
528 case ICMP6_PARAMPROB_NEXTHEADER:
529 code = PRC_UNREACH_PROTOCOL;
531 case ICMP6_PARAMPROB_HEADER:
532 case ICMP6_PARAMPROB_OPTION:
533 code = PRC_PARAMPROB;
541 case ICMP6_ECHO_REQUEST:
542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
545 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
549 if ((n->m_flags & M_EXT) ||
550 n->m_len < off + sizeof(struct icmp6_hdr)) {
552 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
556 * Prepare an internal mbuf. m_pullup() doesn't
557 * always copy the length we specified.
559 if (maxlen >= MCLBYTES) {
564 n = m_getb(maxlen, MB_DONTWAIT, n0->m_type, M_PKTHDR);
570 n0len = n0->m_pkthdr.len; /* save for use below */
571 M_MOVE_PKTHDR(n, n0);
573 * Copy IPv6 and ICMPv6 only.
575 nip6 = mtod(n, struct ip6_hdr *);
576 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
577 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
578 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
579 noff = sizeof(struct ip6_hdr);
580 /* new mbuf contains only ipv6+icmpv6 headers */
581 n->m_len = noff + sizeof(struct icmp6_hdr);
583 * Adjust mbuf. ip6_plen will be adjusted in
586 m_adj(n0, off + sizeof(struct icmp6_hdr));
587 /* recalculate complete packet size */
588 n->m_pkthdr.len = n0len + (noff - off);
591 nip6 = mtod(n, struct ip6_hdr *);
592 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
595 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
596 nicmp6->icmp6_code = 0;
598 icmp6stat.icp6s_reflect++;
599 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
600 icmp6_reflect(n, noff);
604 case ICMP6_ECHO_REPLY:
605 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
610 case MLD_LISTENER_QUERY:
611 case MLD_LISTENER_REPORT:
612 if (icmp6len < sizeof(struct mld_hdr))
614 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
615 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
617 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
618 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
628 case MLD_LISTENER_DONE:
629 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
630 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
632 break; /* nothing to be done in kernel */
634 case MLD_MTRACE_RESP:
636 /* XXX: these two are experimental. not officially defind. */
637 /* XXX: per-interface statistics? */
638 break; /* just pass it to applications */
640 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
642 enum { WRU, FQDN } mode;
647 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
649 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
654 #define hostnamelen strlen(hostname)
656 #ifndef PULLDOWN_TEST
657 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
660 n = m_copy(m, 0, M_COPYALL);
662 n = ni6_input(n, off);
663 /* XXX meaningless if n == NULL */
664 noff = sizeof(struct ip6_hdr);
669 if ((icmp6_nodeinfo & 5) != 5)
674 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
675 if (maxlen >= MCLBYTES) {
679 n = m_getb(maxlen, MB_DONTWAIT, m->m_type, M_PKTHDR);
684 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) {
686 * Previous code did a blind M_COPY_PKTHDR
687 * and said "just for rcvif". If true, then
688 * we could tolerate the dup failing (due to
689 * the deep copy of the tag chain). For now
690 * be conservative and just fail.
696 maxhlen = M_TRAILINGSPACE(n) - maxlen;
697 if (maxhlen > hostnamelen)
698 maxhlen = hostnamelen;
700 * Copy IPv6 and ICMPv6 only.
702 nip6 = mtod(n, struct ip6_hdr *);
703 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
704 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
705 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
706 p = (u_char *)(nicmp6 + 1);
708 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
709 noff = sizeof(struct ip6_hdr);
710 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
711 sizeof(struct icmp6_hdr) + 4 + maxhlen;
712 nicmp6->icmp6_type = ICMP6_WRUREPLY;
713 nicmp6->icmp6_code = 0;
717 icmp6stat.icp6s_reflect++;
718 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
719 icmp6_reflect(n, noff);
729 case ND_ROUTER_SOLICIT:
730 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
733 if (icmp6len < sizeof(struct nd_router_solicit))
735 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
737 nd6_rs_input(m, off, icmp6len);
741 nd6_rs_input(n, off, icmp6len);
745 case ND_ROUTER_ADVERT:
746 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
749 if (icmp6len < sizeof(struct nd_router_advert))
751 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
753 nd6_ra_input(m, off, icmp6len);
757 nd6_ra_input(n, off, icmp6len);
761 case ND_NEIGHBOR_SOLICIT:
762 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
765 if (icmp6len < sizeof(struct nd_neighbor_solicit))
767 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
769 nd6_ns_input(m, off, icmp6len);
773 nd6_ns_input(n, off, icmp6len);
777 case ND_NEIGHBOR_ADVERT:
778 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
781 if (icmp6len < sizeof(struct nd_neighbor_advert))
783 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
785 nd6_na_input(m, off, icmp6len);
789 nd6_na_input(n, off, icmp6len);
794 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
797 if (icmp6len < sizeof(struct nd_redirect))
799 if ((n = m_copym(m, 0, M_COPYALL, MB_DONTWAIT)) == NULL) {
801 icmp6_redirect_input(m, off);
805 icmp6_redirect_input(n, off);
809 case ICMP6_ROUTER_RENUMBERING:
810 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
811 code != ICMP6_ROUTER_RENUMBERING_RESULT)
813 if (icmp6len < sizeof(struct icmp6_router_renum))
819 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
820 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
821 ip6_sprintf(&ip6->ip6_dst),
822 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
823 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
824 /* ICMPv6 error: MUST deliver it by spec... */
828 /* ICMPv6 informational: MUST not deliver */
832 if (icmp6_notify_error(m, off, icmp6len, code)) {
833 /* In this case, m should've been freed. */
834 return (IPPROTO_DONE);
839 icmp6stat.icp6s_badcode++;
843 icmp6stat.icp6s_badlen++;
847 /* deliver the packet to appropriate sockets */
848 icmp6_rip6_input(&m, *offp);
858 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
860 struct icmp6_hdr *icmp6;
861 struct ip6_hdr *eip6;
863 struct sockaddr_in6 icmp6src, icmp6dst;
865 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
866 icmp6stat.icp6s_tooshort++;
869 #ifndef PULLDOWN_TEST
870 IP6_EXTHDR_CHECK(m, off,
871 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
873 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
875 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
876 sizeof(*icmp6) + sizeof(struct ip6_hdr));
878 icmp6stat.icp6s_tooshort++;
882 eip6 = (struct ip6_hdr *)(icmp6 + 1);
884 /* Detect the upper level protocol */
886 u_int8_t nxt = eip6->ip6_nxt;
887 int eoff = off + sizeof(struct icmp6_hdr) +
888 sizeof(struct ip6_hdr);
889 struct ip6ctlparam ip6cp;
890 struct in6_addr *finaldst = NULL;
891 int icmp6type = icmp6->icmp6_type;
893 struct ip6_rthdr *rth;
896 while (1) { /* XXX: should avoid infinite loop explicitly? */
900 case IPPROTO_HOPOPTS:
901 case IPPROTO_DSTOPTS:
903 #ifndef PULLDOWN_TEST
904 IP6_EXTHDR_CHECK(m, 0, eoff +
905 sizeof(struct ip6_ext),
907 eh = (struct ip6_ext *)(mtod(m, caddr_t)
910 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
913 icmp6stat.icp6s_tooshort++;
918 if (nxt == IPPROTO_AH)
919 eoff += (eh->ip6e_len + 2) << 2;
921 eoff += (eh->ip6e_len + 1) << 3;
924 case IPPROTO_ROUTING:
926 * When the erroneous packet contains a
927 * routing header, we should examine the
928 * header to determine the final destination.
929 * Otherwise, we can't properly update
930 * information that depends on the final
931 * destination (e.g. path MTU).
933 #ifndef PULLDOWN_TEST
934 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
936 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
939 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
942 icmp6stat.icp6s_tooshort++;
946 rthlen = (rth->ip6r_len + 1) << 3;
950 case IPPROTO_FRAGMENT:
951 #ifndef PULLDOWN_TEST
952 IP6_EXTHDR_CHECK(m, 0, eoff +
953 sizeof(struct ip6_frag),
955 fh = (struct ip6_frag *)(mtod(m, caddr_t)
958 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
961 icmp6stat.icp6s_tooshort++;
966 * Data after a fragment header is meaningless
967 * unless it is the first fragment, but
968 * we'll go to the notify label for path MTU
971 if (fh->ip6f_offlg & IP6F_OFF_MASK)
974 eoff += sizeof(struct ip6_frag);
979 * This case includes ESP and the No Next
980 * Header. In such cases going to the notify
981 * label does not have any meaning
982 * (i.e. pr_ctlinput will be NULL), but we go
983 * anyway since we might have to update
984 * path MTU information.
990 #ifndef PULLDOWN_TEST
991 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
993 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
994 sizeof(*icmp6) + sizeof(struct ip6_hdr));
996 icmp6stat.icp6s_tooshort++;
1001 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1002 bzero(&icmp6dst, sizeof(icmp6dst));
1003 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1004 icmp6dst.sin6_family = AF_INET6;
1005 if (finaldst == NULL)
1006 icmp6dst.sin6_addr = eip6->ip6_dst;
1008 icmp6dst.sin6_addr = *finaldst;
1009 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1010 &icmp6dst.sin6_addr);
1011 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1013 /* should be impossbile */
1015 "icmp6_notify_error: in6_embedscope failed\n"));
1020 * retrieve parameters from the inner IPv6 header, and convert
1021 * them into sockaddr structures.
1023 bzero(&icmp6src, sizeof(icmp6src));
1024 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1025 icmp6src.sin6_family = AF_INET6;
1026 icmp6src.sin6_addr = eip6->ip6_src;
1027 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1028 &icmp6src.sin6_addr);
1029 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1031 /* should be impossbile */
1033 "icmp6_notify_error: in6_embedscope failed\n"));
1036 icmp6src.sin6_flowinfo =
1037 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1039 if (finaldst == NULL)
1040 finaldst = &eip6->ip6_dst;
1042 ip6cp.ip6c_icmp6 = icmp6;
1043 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1044 ip6cp.ip6c_off = eoff;
1045 ip6cp.ip6c_finaldst = finaldst;
1046 ip6cp.ip6c_src = &icmp6src;
1047 ip6cp.ip6c_nxt = nxt;
1049 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1050 notifymtu = ntohl(icmp6->icmp6_mtu);
1051 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1052 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1056 (struct protosw *)&inet6sw[ip6_protox[nxt]],
1057 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1067 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1069 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1070 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1071 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1072 u_int mtu = ntohl(icmp6->icmp6_mtu);
1073 struct rtentry *rt = NULL;
1074 struct sockaddr_in6 sin6;
1079 bzero(&sin6, sizeof(sin6));
1080 sin6.sin6_family = PF_INET6;
1081 sin6.sin6_len = sizeof(struct sockaddr_in6);
1082 sin6.sin6_addr = *dst;
1083 /* XXX normally, this won't happen */
1084 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1085 sin6.sin6_addr.s6_addr16[1] =
1086 htons(m->m_pkthdr.rcvif->if_index);
1088 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1089 rt = rtpurelookup((struct sockaddr *)&sin6);
1090 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1091 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1092 if (mtu < IPV6_MMTU) { /* XXX */
1093 rt->rt_rmx.rmx_locks |= RTV_MTU;
1094 } else if (mtu < rt->rt_ifp->if_mtu &&
1095 rt->rt_rmx.rmx_mtu > mtu) {
1096 icmp6stat.icp6s_pmtuchg++;
1097 rt->rt_rmx.rmx_mtu = mtu;
1105 * Process a Node Information Query packet, based on
1106 * draft-ietf-ipngwg-icmp-name-lookups-07.
1108 * Spec incompatibilities:
1109 * - IPv6 Subject address handling
1110 * - IPv4 Subject address handling support missing
1111 * - Proxy reply (answer even if it's not for me)
1112 * - joins NI group address at in6_ifattach() time only, does not cope
1113 * with hostname changes by sethostname(3)
1115 #define hostnamelen strlen(hostname)
1116 static struct mbuf *
1117 ni6_input(struct mbuf *m, int off)
1119 struct icmp6_nodeinfo *ni6, *nni6;
1120 struct mbuf *n = NULL;
1123 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1124 struct ni_reply_fqdn *fqdn;
1125 int addrs; /* for NI_QTYPE_NODEADDR */
1126 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1127 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1128 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1129 struct ip6_hdr *ip6;
1130 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1132 struct in6_ifaddr *ia6 = NULL;
1134 ip6 = mtod(m, struct ip6_hdr *);
1135 #ifndef PULLDOWN_TEST
1136 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1138 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1140 /* m is already reclaimed */
1146 * Validate IPv6 destination address.
1148 * The Responder must discard the Query without further processing
1149 * unless it is one of the Responder's unicast or anycast addresses, or
1150 * a link-local scope multicast address which the Responder has joined.
1151 * [icmp-name-lookups-07, Section 4.]
1153 bzero(&sin6, sizeof(sin6));
1154 sin6.sin6_family = AF_INET6;
1155 sin6.sin6_len = sizeof(struct sockaddr_in6);
1156 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1158 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1159 /* unicast/anycast, fine */
1160 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1161 (icmp6_nodeinfo & 4) == 0) {
1162 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1163 "a temporary address in %s:%d",
1164 __FILE__, __LINE__));
1167 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1168 ; /* link-local multicast, fine */
1172 /* validate query Subject field. */
1173 qtype = ntohs(ni6->ni_qtype);
1174 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1177 case NI_QTYPE_SUPTYPES:
1179 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1183 case NI_QTYPE_NODEADDR:
1184 switch (ni6->ni_code) {
1185 case ICMP6_NI_SUBJ_IPV6:
1186 #if ICMP6_NI_SUBJ_IPV6 != 0
1190 * backward compatibility - try to accept 03 draft
1191 * format, where no Subject is present.
1193 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1198 #if ICMP6_NI_SUBJ_IPV6 != 0
1199 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1203 if (subjlen != sizeof(sin6.sin6_addr))
1207 * Validate Subject address.
1209 * Not sure what exactly "address belongs to the node"
1210 * means in the spec, is it just unicast, or what?
1212 * At this moment we consider Subject address as
1213 * "belong to the node" if the Subject address equals
1214 * to the IPv6 destination address; validation for
1215 * IPv6 destination address should have done enough
1218 * We do not do proxy at this moment.
1220 /* m_pulldown instead of copy? */
1221 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1222 subjlen, (caddr_t)&sin6.sin6_addr);
1223 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1225 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1226 bzero(&sin6_d, sizeof(sin6_d));
1227 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1228 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1229 sin6_d.sin6_addr = ip6->ip6_dst;
1230 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1232 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1233 subj = (char *)&sin6;
1234 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1238 * XXX if we are to allow other cases, we should really
1239 * be careful about scope here.
1240 * basically, we should disallow queries toward IPv6
1241 * destination X with subject Y, if scope(X) > scope(Y).
1242 * if we allow scope(X) > scope(Y), it will result in
1243 * information leakage across scope boundary.
1247 case ICMP6_NI_SUBJ_FQDN:
1249 * Validate Subject name with gethostname(3).
1251 * The behavior may need some debate, since:
1252 * - we are not sure if the node has FQDN as
1253 * hostname (returned by gethostname(3)).
1254 * - the code does wildcard match for truncated names.
1255 * however, we are not sure if we want to perform
1256 * wildcard match, if gethostname(3) side has
1257 * truncated hostname.
1259 n = ni6_nametodns(hostname, hostnamelen, 0);
1260 if (!n || n->m_next || n->m_len == 0)
1262 IP6_EXTHDR_GET(subj, char *, m,
1263 off + sizeof(struct icmp6_nodeinfo), subjlen);
1266 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1274 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1281 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1284 if ((icmp6_nodeinfo & 1) == 0)
1287 case NI_QTYPE_NODEADDR:
1288 if ((icmp6_nodeinfo & 2) == 0)
1293 /* guess reply length */
1296 break; /* no reply data */
1297 case NI_QTYPE_SUPTYPES:
1298 replylen += sizeof(u_int32_t);
1301 /* XXX will append an mbuf */
1302 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1304 case NI_QTYPE_NODEADDR:
1305 addrs = ni6_addrs(ni6, m, &ifp, subj);
1306 if ((replylen += addrs * (sizeof(struct in6_addr) +
1307 sizeof(u_int32_t))) > MCLBYTES)
1308 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1312 * XXX: We must return a reply with the ICMP6 code
1313 * `unknown Qtype' in this case. However we regard the case
1314 * as an FQDN query for backward compatibility.
1315 * Older versions set a random value to this field,
1316 * so it rarely varies in the defined qtypes.
1317 * But the mechanism is not reliable...
1318 * maybe we should obsolete older versions.
1320 qtype = NI_QTYPE_FQDN;
1321 /* XXX will append an mbuf */
1322 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1327 /* allocate an mbuf to reply. */
1328 if (replylen > MCLBYTES) {
1330 * XXX: should we try to allocate more? But MCLBYTES
1331 * is probably much larger than IPV6_MMTU...
1335 n = m_getb(replylen, MB_DONTWAIT, m->m_type, M_PKTHDR);
1340 M_MOVE_PKTHDR(n, m); /* just for recvif */
1341 n->m_pkthdr.len = n->m_len = replylen;
1343 /* copy mbuf header and IPv6 + Node Information base headers */
1344 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1345 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1346 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1348 /* qtype dependent procedure */
1351 nni6->ni_code = ICMP6_NI_SUCCESS;
1354 case NI_QTYPE_SUPTYPES:
1357 nni6->ni_code = ICMP6_NI_SUCCESS;
1358 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1359 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1360 v = (u_int32_t)htonl(0x0000000f);
1361 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1365 nni6->ni_code = ICMP6_NI_SUCCESS;
1366 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1367 sizeof(struct ip6_hdr) +
1368 sizeof(struct icmp6_nodeinfo));
1369 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1370 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1372 * XXX do we really have FQDN in variable "hostname"?
1374 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1375 if (n->m_next == NULL)
1377 /* XXX we assume that n->m_next is not a chain */
1378 if (n->m_next->m_next != NULL)
1380 n->m_pkthdr.len += n->m_next->m_len;
1382 case NI_QTYPE_NODEADDR:
1386 nni6->ni_code = ICMP6_NI_SUCCESS;
1387 n->m_pkthdr.len = n->m_len =
1388 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1389 lenlim = M_TRAILINGSPACE(n);
1390 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1391 /* XXX: reset mbuf length */
1392 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1393 sizeof(struct icmp6_nodeinfo) + copied;
1397 break; /* XXX impossible! */
1400 nni6->ni_type = ICMP6_NI_REPLY;
1413 * make a mbuf with DNS-encoded string. no compression support.
1415 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1416 * treated as truncated name (two \0 at the end). this is a wild guess.
1418 static struct mbuf *
1419 ni6_nametodns(const char *name, int namelen,
1420 int old) /* return pascal string if non-zero */
1432 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1433 m = m_getb(len, MB_DONTWAIT, MT_DATA, 0);
1439 *mtod(m, char *) = namelen;
1440 bcopy(name, mtod(m, char *) + 1, namelen);
1444 cp = mtod(m, char *);
1445 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1447 /* if not certain about my name, return empty buffer */
1452 * guess if it looks like shortened hostname, or FQDN.
1453 * shortened hostname needs two trailing "\0".
1456 for (p = name; p < name + namelen; p++) {
1457 if (*p && *p == '.')
1466 while (cp < ep && p < name + namelen) {
1468 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1470 /* result does not fit into mbuf */
1471 if (cp + i + 1 >= ep)
1474 * DNS label length restriction, RFC1035 page 8.
1475 * "i == 0" case is included here to avoid returning
1476 * 0-length label on "foo..bar".
1478 if (i <= 0 || i >= 64)
1484 if (p < name + namelen && *p == '.')
1488 if (cp + nterm >= ep)
1492 m->m_len = cp - mtod(m, char *);
1496 panic("should not reach here");
1506 * check if two DNS-encoded string matches. takes care of truncated
1507 * form (with \0\0 at the end). no compression support.
1508 * XXX upper/lowercase match (see RFC2065)
1511 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1513 const char *a0, *b0;
1516 /* simplest case - need validation? */
1517 if (alen == blen && bcmp(a, b, alen) == 0)
1523 /* termination is mandatory */
1524 if (alen < 2 || blen < 2)
1526 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1531 while (a - a0 < alen && b - b0 < blen) {
1532 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1535 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1537 /* we don't support compression yet */
1538 if (a[0] >= 64 || b[0] >= 64)
1541 /* truncated case */
1542 if (a[0] == 0 && a - a0 == alen - 1)
1544 if (b[0] == 0 && b - b0 == blen - 1)
1546 if (a[0] == 0 || b[0] == 0)
1552 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1554 if (bcmp(a + 1, b + 1, l) != 0)
1561 if (a - a0 == alen && b - b0 == blen)
1568 * calculate the number of addresses to be returned in the node info reply.
1571 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1575 struct in6_ifaddr *ifa6;
1576 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1577 int addrs = 0, addrsofif, iffound = 0;
1578 int niflags = ni6->ni_flags;
1580 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1581 switch (ni6->ni_code) {
1582 case ICMP6_NI_SUBJ_IPV6:
1583 if (subj == NULL) /* must be impossible... */
1585 subj_ip6 = (struct sockaddr_in6 *)subj;
1589 * XXX: we only support IPv6 subject address for
1596 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1598 struct ifaddr_container *ifac;
1601 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1603 struct ifaddr *ifa = ifac->ifa;
1605 if (ifa->ifa_addr->sa_family != AF_INET6)
1607 ifa6 = (struct in6_ifaddr *)ifa;
1609 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1610 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1611 &ifa6->ia_addr.sin6_addr))
1615 * IPv4-mapped addresses can only be returned by a
1616 * Node Information proxy, since they represent
1617 * addresses of IPv4-only nodes, which perforce do
1618 * not implement this protocol.
1619 * [icmp-name-lookups-07, Section 5.4]
1620 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1621 * this function at this moment.
1624 /* What do we have to do about ::1? */
1625 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1626 case IPV6_ADDR_SCOPE_LINKLOCAL:
1627 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1630 case IPV6_ADDR_SCOPE_SITELOCAL:
1631 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1634 case IPV6_ADDR_SCOPE_GLOBAL:
1635 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1643 * check if anycast is okay.
1644 * XXX: just experimental. not in the spec.
1646 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1647 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1648 continue; /* we need only unicast addresses */
1649 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1650 (icmp6_nodeinfo & 4) == 0) {
1653 addrsofif++; /* count the address */
1667 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1668 struct ifnet *ifp0, int resid)
1670 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
1671 struct in6_ifaddr *ifa6;
1672 struct ifnet *ifp_dep = NULL;
1673 int copied = 0, allow_deprecated = 0;
1674 u_char *cp = (u_char *)(nni6 + 1);
1675 int niflags = ni6->ni_flags;
1678 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1679 return (0); /* needless to copy */
1683 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list))
1685 struct ifaddr_container *ifac;
1687 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1688 struct ifaddr *ifa = ifac->ifa;
1690 if (ifa->ifa_addr->sa_family != AF_INET6)
1692 ifa6 = (struct in6_ifaddr *)ifa;
1694 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1695 allow_deprecated == 0) {
1697 * prefererred address should be put before
1698 * deprecated addresses.
1701 /* record the interface for later search */
1702 if (ifp_dep == NULL)
1707 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1708 allow_deprecated != 0)
1709 continue; /* we now collect deprecated addrs */
1711 /* What do we have to do about ::1? */
1712 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1713 case IPV6_ADDR_SCOPE_LINKLOCAL:
1714 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1717 case IPV6_ADDR_SCOPE_SITELOCAL:
1718 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1721 case IPV6_ADDR_SCOPE_GLOBAL:
1722 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1730 * check if anycast is okay.
1731 * XXX: just experimental. not in the spec.
1733 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1734 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1736 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1737 (icmp6_nodeinfo & 4) == 0) {
1741 /* now we can copy the address */
1742 if (resid < sizeof(struct in6_addr) +
1743 sizeof(u_int32_t)) {
1745 * We give up much more copy.
1746 * Set the truncate flag and return.
1749 NI_NODEADDR_FLAG_TRUNCATE;
1754 * Set the TTL of the address.
1755 * The TTL value should be one of the following
1756 * according to the specification:
1758 * 1. The remaining lifetime of a DHCP lease on the
1760 * 2. The remaining Valid Lifetime of a prefix from
1761 * which the address was derived through Stateless
1762 * Autoconfiguration.
1764 * Note that we currently do not support stateful
1765 * address configuration by DHCPv6, so the former
1766 * case can't happen.
1768 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1769 ltime = ND6_INFINITE_LIFETIME;
1771 if (ifa6->ia6_lifetime.ia6t_expire >
1773 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1778 bcopy(<ime, cp, sizeof(u_int32_t));
1779 cp += sizeof(u_int32_t);
1781 /* copy the address itself */
1782 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1783 sizeof(struct in6_addr));
1784 /* XXX: KAME link-local hack; remove ifindex */
1785 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1786 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1787 cp += sizeof(struct in6_addr);
1789 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1790 copied += (sizeof(struct in6_addr) +
1793 if (ifp0) /* we need search only on the specified IF */
1797 if (allow_deprecated == 0 && ifp_dep != NULL) {
1799 allow_deprecated = 1;
1808 * XXX almost dup'ed code with rip6_input.
1811 icmp6_rip6_input(struct mbuf **mp, int off)
1813 struct mbuf *m = *mp;
1814 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1815 struct in6pcb *in6p;
1816 struct in6pcb *last = NULL;
1817 struct sockaddr_in6 rip6src;
1818 struct icmp6_hdr *icmp6;
1819 struct mbuf *opts = NULL;
1821 #ifndef PULLDOWN_TEST
1822 /* this is assumed to be safe. */
1823 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1825 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1826 if (icmp6 == NULL) {
1827 /* m is already reclaimed */
1828 return IPPROTO_DONE;
1832 bzero(&rip6src, sizeof(rip6src));
1833 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1834 rip6src.sin6_family = AF_INET6;
1835 /* KAME hack: recover scopeid */
1836 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1838 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1840 if (in6p->inp_flags & INP_PLACEMARKER)
1842 if ((in6p->inp_vflag & INP_IPV6) == 0)
1844 #ifdef HAVE_NRL_INPCB
1845 if (!(in6p->in6p_flags & INP_IPV6))
1848 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1850 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1851 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1853 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1854 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1856 if (in6p->in6p_icmp6filt
1857 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1858 in6p->in6p_icmp6filt))
1864 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1865 if (last->in6p_flags & IN6P_CONTROLOPTS)
1866 ip6_savecontrol(last, &opts, ip6, n);
1867 /* strip intermediate headers */
1869 so = last->in6p_socket;
1870 lwkt_gettoken(&so->so_rcv.ssb_token);
1871 if (ssb_appendaddr(&so->so_rcv,
1872 (struct sockaddr *)&rip6src,
1874 /* should notify about lost packet */
1881 lwkt_reltoken(&so->so_rcv.ssb_token);
1890 if (last->in6p_flags & IN6P_CONTROLOPTS)
1891 ip6_savecontrol(last, &opts, ip6, m);
1892 /* strip intermediate headers */
1894 so = last->in6p_socket;
1895 lwkt_gettoken(&so->so_rcv.ssb_token);
1896 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
1904 lwkt_reltoken(&so->so_rcv.ssb_token);
1907 ip6stat.ip6s_delivered--;
1909 return IPPROTO_DONE;
1913 * Reflect the ip6 packet back to the source.
1914 * OFF points to the icmp6 header, counted from the top of the mbuf.
1917 icmp6_reflect(struct mbuf *m, size_t off)
1919 struct ip6_hdr *ip6;
1920 struct icmp6_hdr *icmp6;
1921 struct in6_ifaddr *ia;
1922 struct in6_addr t, *src = NULL;
1925 struct ifnet *outif = NULL;
1926 struct sockaddr_in6 sa6_src, sa6_dst;
1927 #ifdef COMPAT_RFC1885
1928 int mtu = IPV6_MMTU;
1929 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1932 /* too short to reflect */
1933 if (off < sizeof(struct ip6_hdr)) {
1935 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1936 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1937 __FILE__, __LINE__));
1942 * If there are extra headers between IPv6 and ICMPv6, strip
1943 * off that header first.
1946 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1947 panic("assumption failed in icmp6_reflect");
1949 if (off > sizeof(struct ip6_hdr)) {
1951 struct ip6_hdr nip6;
1953 l = off - sizeof(struct ip6_hdr);
1954 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1956 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1958 if ((m = m_pullup(m, l)) == NULL)
1961 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1962 } else /* off == sizeof(struct ip6_hdr) */ {
1964 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1966 if ((m = m_pullup(m, l)) == NULL)
1970 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1971 ip6 = mtod(m, struct ip6_hdr *);
1972 ip6->ip6_nxt = IPPROTO_ICMPV6;
1973 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1974 type = icmp6->icmp6_type; /* keep type for statistics */
1975 code = icmp6->icmp6_code; /* ditto. */
1979 * ip6_input() drops a packet if its src is multicast.
1980 * So, the src is never multicast.
1982 ip6->ip6_dst = ip6->ip6_src;
1985 * XXX: make sure to embed scope zone information, using
1986 * already embedded IDs or the received interface (if any).
1987 * Note that rcvif may be NULL.
1988 * TODO: scoped routing case (XXX).
1990 bzero(&sa6_src, sizeof(sa6_src));
1991 sa6_src.sin6_family = AF_INET6;
1992 sa6_src.sin6_len = sizeof(sa6_src);
1993 sa6_src.sin6_addr = ip6->ip6_dst;
1994 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1995 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
1996 bzero(&sa6_dst, sizeof(sa6_dst));
1997 sa6_dst.sin6_family = AF_INET6;
1998 sa6_dst.sin6_len = sizeof(sa6_dst);
1999 sa6_dst.sin6_addr = t;
2000 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2001 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2003 #ifdef COMPAT_RFC1885
2006 * RFC 1885 requires that echo reply should be truncated if it
2007 * does not fit in with (return) path MTU, but the description was
2008 * removed in the new spec.
2010 if (icmp6_reflect_rt.ro_rt == 0 ||
2011 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2012 if (icmp6_reflect_rt.ro_rt) {
2013 RTFREE(icmp6_reflect_rt.ro_rt);
2014 icmp6_reflect_rt.ro_rt = 0;
2016 bzero(sin6, sizeof(*sin6));
2017 sin6->sin6_family = PF_INET6;
2018 sin6->sin6_len = sizeof(struct sockaddr_in6);
2019 sin6->sin6_addr = ip6->ip6_dst;
2021 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2025 if (icmp6_reflect_rt.ro_rt == 0)
2028 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2029 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2030 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2032 if (mtu < m->m_pkthdr.len) {
2033 plen -= (m->m_pkthdr.len - mtu);
2034 m_adj(m, mtu - m->m_pkthdr.len);
2038 * If the incoming packet was addressed directly to us(i.e. unicast),
2039 * use dst as the src for the reply.
2040 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2041 * (for example) when we encounter an error while forwarding procedure
2042 * destined to a duplicated address of ours.
2044 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2045 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2046 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2050 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2052 * This is the case if the dst is our link-local address
2053 * and the sender is also ourselves.
2060 struct route_in6 ro;
2063 * This case matches to multicasts, our anycast, or unicasts
2064 * that we do not own. Select a source address based on the
2065 * source address of the erroneous packet.
2067 bzero(&ro, sizeof(ro));
2068 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2070 RTFREE(ro.ro_rt); /* XXX: we could use this */
2073 "icmp6_reflect: source can't be determined: "
2074 "dst=%s, error=%d\n",
2075 ip6_sprintf(&sa6_src.sin6_addr), e));
2080 ip6->ip6_src = *src;
2083 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2084 ip6->ip6_vfc |= IPV6_VERSION;
2085 ip6->ip6_nxt = IPPROTO_ICMPV6;
2086 if (m->m_pkthdr.rcvif) {
2087 /* XXX: This may not be the outgoing interface */
2088 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2090 ip6->ip6_hlim = ip6_defhlim;
2092 icmp6->icmp6_cksum = 0;
2093 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2094 sizeof(struct ip6_hdr), plen);
2097 * XXX option handling
2100 m->m_flags &= ~(M_BCAST|M_MCAST);
2102 #ifdef COMPAT_RFC1885
2103 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2105 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2108 icmp6_ifoutstat_inc(outif, type, code);
2118 icmp6_fasttimo(void)
2125 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2126 struct in6_addr *tgt6)
2128 static char buf[1024];
2129 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2130 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2135 icmp6_redirect_input(struct mbuf *m, int off)
2137 struct ifnet *ifp = m->m_pkthdr.rcvif;
2138 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2139 struct nd_redirect *nd_rd;
2140 int icmp6len = ntohs(ip6->ip6_plen);
2141 char *lladdr = NULL;
2143 u_char *redirhdr = NULL;
2144 int redirhdrlen = 0;
2145 struct rtentry *rt = NULL;
2148 struct in6_addr src6 = ip6->ip6_src;
2149 struct in6_addr redtgt6;
2150 struct in6_addr reddst6;
2151 union nd_opts ndopts;
2156 /* XXX if we are router, we don't update route by icmp6 redirect */
2159 if (!icmp6_rediraccept)
2162 #ifndef PULLDOWN_TEST
2163 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2164 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2166 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2167 if (nd_rd == NULL) {
2168 icmp6stat.icp6s_tooshort++;
2172 redtgt6 = nd_rd->nd_rd_target;
2173 reddst6 = nd_rd->nd_rd_dst;
2175 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2176 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2177 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2178 reddst6.s6_addr16[1] = htons(ifp->if_index);
2181 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2183 "ICMP6 redirect sent from %s rejected; "
2184 "must be from linklocal\n", ip6_sprintf(&src6)));
2187 if (ip6->ip6_hlim != 255) {
2189 "ICMP6 redirect sent from %s rejected; "
2190 "hlim=%d (must be 255)\n",
2191 ip6_sprintf(&src6), ip6->ip6_hlim));
2195 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2196 struct sockaddr_in6 sin6;
2197 struct in6_addr *gw6;
2199 bzero(&sin6, sizeof(sin6));
2200 sin6.sin6_family = AF_INET6;
2201 sin6.sin6_len = sizeof(struct sockaddr_in6);
2202 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2203 rt = rtpurelookup((struct sockaddr *)&sin6);
2205 if (rt->rt_gateway == NULL ||
2206 rt->rt_gateway->sa_family != AF_INET6) {
2208 "ICMP6 redirect rejected; no route "
2209 "with inet6 gateway found for redirect dst: %s\n",
2210 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2215 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2216 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2218 "ICMP6 redirect rejected; "
2219 "not equal to gw-for-src=%s (must be same): "
2222 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2228 "ICMP6 redirect rejected; "
2229 "no route found for redirect dst: %s\n",
2230 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2236 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2238 "ICMP6 redirect rejected; "
2239 "redirect dst must be unicast: %s\n",
2240 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2244 is_router = is_onlink = 0;
2245 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2246 is_router = 1; /* router case */
2247 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2248 is_onlink = 1; /* on-link destination case */
2249 if (!is_router && !is_onlink) {
2251 "ICMP6 redirect rejected; "
2252 "neither router case nor onlink case: %s\n",
2253 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2256 /* validation passed */
2258 icmp6len -= sizeof(*nd_rd);
2259 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2260 if (nd6_options(&ndopts) < 0) {
2261 nd6log((LOG_INFO, "icmp6_redirect_input: "
2262 "invalid ND option, rejected: %s\n",
2263 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2264 /* nd6_options have incremented stats */
2268 if (ndopts.nd_opts_tgt_lladdr) {
2269 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2270 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2273 if (ndopts.nd_opts_rh) {
2274 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2275 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2278 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2280 "icmp6_redirect_input: lladdrlen mismatch for %s "
2281 "(if %d, icmp6 packet %d): %s\n",
2282 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2288 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2289 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2291 if (!is_onlink) { /* better router case. perform rtredirect. */
2292 /* perform rtredirect */
2293 struct sockaddr_in6 sdst;
2294 struct sockaddr_in6 sgw;
2295 struct sockaddr_in6 ssrc;
2297 bzero(&sdst, sizeof(sdst));
2298 bzero(&sgw, sizeof(sgw));
2299 bzero(&ssrc, sizeof(ssrc));
2300 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2301 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2302 sizeof(struct sockaddr_in6);
2303 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2304 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2305 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2306 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2307 NULL, RTF_GATEWAY | RTF_HOST,
2308 (struct sockaddr *)&ssrc);
2310 /* finally update cached route in each socket via kpfctlinput */
2312 struct sockaddr_in6 sdst;
2314 bzero(&sdst, sizeof(sdst));
2315 sdst.sin6_family = AF_INET6;
2316 sdst.sin6_len = sizeof(struct sockaddr_in6);
2317 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2318 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2320 key_sa_routechange((struct sockaddr *)&sdst);
2329 icmp6stat.icp6s_badredirect++;
2334 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2336 struct ifnet *ifp; /* my outgoing interface */
2337 struct in6_addr *ifp_ll6;
2338 struct in6_addr *router_ll6;
2339 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2340 struct mbuf *m = NULL; /* newly allocated one */
2341 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2342 struct nd_redirect *nd_rd;
2345 struct ifnet *outif = NULL;
2346 struct sockaddr_in6 src_sa;
2348 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2350 /* if we are not router, we don't send icmp6 redirect */
2351 if (!ip6_forwarding || ip6_accept_rtadv)
2355 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2360 * the source address must identify a neighbor, and
2361 * the destination address must not be a multicast address
2362 * [RFC 2461, sec 8.2]
2364 sip6 = mtod(m0, struct ip6_hdr *);
2365 bzero(&src_sa, sizeof(src_sa));
2366 src_sa.sin6_family = AF_INET6;
2367 src_sa.sin6_len = sizeof(src_sa);
2368 src_sa.sin6_addr = sip6->ip6_src;
2369 /* we don't currently use sin6_scope_id, but eventually use it */
2370 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2371 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2373 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2374 goto fail; /* what should we do here? */
2377 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2381 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2382 * we almost always ask for an mbuf cluster for simplicity.
2383 * (MHLEN < IPV6_MMTU is almost always true)
2385 #if IPV6_MMTU >= MCLBYTES
2386 # error assumption failed about IPV6_MMTU and MCLBYTES
2388 m = m_getb(IPV6_MMTU, MB_DONTWAIT, MT_HEADER, M_PKTHDR);
2392 maxlen = M_TRAILINGSPACE(m);
2393 maxlen = min(IPV6_MMTU, maxlen);
2394 /* just for safety */
2395 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2396 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2401 /* get ip6 linklocal address for ifp(my outgoing interface). */
2402 struct in6_ifaddr *ia;
2403 if ((ia = in6ifa_ifpforlinklocal(ifp,
2405 IN6_IFF_ANYCAST)) == NULL)
2407 ifp_ll6 = &ia->ia_addr.sin6_addr;
2410 /* get ip6 linklocal address for the router. */
2411 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2412 struct sockaddr_in6 *sin6;
2413 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2414 router_ll6 = &sin6->sin6_addr;
2415 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2421 ip6 = mtod(m, struct ip6_hdr *);
2423 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2424 ip6->ip6_vfc |= IPV6_VERSION;
2425 /* ip6->ip6_plen will be set later */
2426 ip6->ip6_nxt = IPPROTO_ICMPV6;
2427 ip6->ip6_hlim = 255;
2428 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2429 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2430 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2433 nd_rd = (struct nd_redirect *)(ip6 + 1);
2434 nd_rd->nd_rd_type = ND_REDIRECT;
2435 nd_rd->nd_rd_code = 0;
2436 nd_rd->nd_rd_reserved = 0;
2437 if (rt->rt_flags & RTF_GATEWAY) {
2439 * nd_rd->nd_rd_target must be a link-local address in
2440 * better router cases.
2444 bcopy(router_ll6, &nd_rd->nd_rd_target,
2445 sizeof(nd_rd->nd_rd_target));
2446 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2447 sizeof(nd_rd->nd_rd_dst));
2449 /* make sure redtgt == reddst */
2450 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2451 sizeof(nd_rd->nd_rd_target));
2452 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2453 sizeof(nd_rd->nd_rd_dst));
2456 p = (u_char *)(nd_rd + 1);
2462 /* target lladdr option */
2463 struct rtentry *rt_router = NULL;
2465 struct sockaddr_dl *sdl;
2466 struct nd_opt_hdr *nd_opt;
2469 rt_router = nd6_lookup(router_ll6, 0, ifp);
2472 len = sizeof(*nd_opt) + ifp->if_addrlen;
2473 len = (len + 7) & ~7; /* round by 8 */
2475 if (len + (p - (u_char *)ip6) > maxlen)
2477 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2478 (rt_router->rt_flags & RTF_LLINFO) &&
2479 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2480 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2482 nd_opt = (struct nd_opt_hdr *)p;
2483 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2484 nd_opt->nd_opt_len = len >> 3;
2485 lladdr = (char *)(nd_opt + 1);
2486 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2492 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2494 /* just to be safe */
2495 #ifdef M_DECRYPTED /*not openbsd*/
2496 if (m0->m_flags & M_DECRYPTED)
2499 if (p - (u_char *)ip6 > maxlen)
2503 /* redirected header option */
2505 struct nd_opt_rd_hdr *nd_opt_rh;
2508 * compute the maximum size for icmp6 redirect header option.
2509 * XXX room for auth header?
2511 len = maxlen - (p - (u_char *)ip6);
2514 /* This is just for simplicity. */
2515 if (m0->m_pkthdr.len != m0->m_len) {
2517 m_freem(m0->m_next);
2520 m0->m_pkthdr.len = m0->m_len;
2524 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2525 * about padding/truncate rule for the original IP packet.
2526 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2527 * - "attach as much as possible" is the goal
2528 * - pad if not aligned (original size can be guessed by original
2530 * Following code adds the padding if it is simple enough,
2531 * and truncates if not.
2533 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2534 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2536 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2537 /* not enough room, truncate */
2538 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2540 /* enough room, pad or truncate */
2543 extra = m0->m_pkthdr.len % 8;
2545 /* pad if easy enough, truncate if not */
2546 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2548 m0->m_len += (8 - extra);
2549 m0->m_pkthdr.len += (8 - extra);
2552 m0->m_pkthdr.len -= extra;
2556 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2557 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2560 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2561 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2562 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2563 nd_opt_rh->nd_opt_rh_len = len >> 3;
2564 p += sizeof(*nd_opt_rh);
2565 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2567 /* connect m0 to m */
2569 m->m_pkthdr.len = m->m_len + m0->m_len;
2573 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2574 sip6->ip6_src.s6_addr16[1] = 0;
2575 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2576 sip6->ip6_dst.s6_addr16[1] = 0;
2578 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2579 ip6->ip6_src.s6_addr16[1] = 0;
2580 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2581 ip6->ip6_dst.s6_addr16[1] = 0;
2583 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2584 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2585 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2586 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2588 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2590 nd_rd->nd_rd_cksum = 0;
2592 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2594 /* send the packet to outside... */
2595 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2597 icmp6_ifstat_inc(outif, ifs6_out_msg);
2598 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2600 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2611 #ifdef HAVE_NRL_INPCB
2612 #define in6pcb inpcb
2613 #define in6p_icmp6filt inp_icmp6filt
2616 * ICMPv6 socket option processing.
2619 icmp6_ctloutput(netmsg_t msg)
2621 struct socket *so = msg->ctloutput.base.nm_so;
2622 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2625 struct inpcb *inp = so->so_pcb;
2626 int level, op, optname;
2629 level = sopt->sopt_level;
2630 op = sopt->sopt_dir;
2631 optname = sopt->sopt_name;
2632 optlen = sopt->sopt_valsize;
2634 level = op = optname = optlen = 0;
2636 if (level != IPPROTO_ICMPV6) {
2646 struct icmp6_filter *p;
2648 if (optlen != sizeof(*p)) {
2652 if (inp->in6p_icmp6filt == NULL) {
2656 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2662 error = ENOPROTOOPT;
2671 if (inp->in6p_icmp6filt == NULL) {
2675 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2676 sizeof(struct icmp6_filter));
2681 error = ENOPROTOOPT;
2687 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2689 #ifdef HAVE_NRL_INPCB
2691 #undef in6p_icmp6filt
2694 #ifndef HAVE_PPSRATECHECK
2696 #define timersub(tvp, uvp, vvp) \
2698 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2699 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2700 if ((vvp)->tv_usec < 0) { \
2702 (vvp)->tv_usec += 1000000; \
2708 * ppsratecheck(): packets (or events) per second limitation.
2711 ppsratecheck(struct timeval *lasttime, int *curpps,
2712 int maxpps) /* maximum pps allowed */
2714 struct timeval tv, delta;
2719 timersub(&tv, lasttime, &delta);
2722 * Check for 0,0 so that the message will be seen at least once.
2723 * If more than one second has passed since the last update of
2724 * lasttime, reset the counter.
2726 * We do increment *curpps even in *curpps < maxpps case, as some may
2727 * try to use *curpps for stat purposes as well.
2729 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2730 delta.tv_sec >= 1) {
2734 } else if (maxpps < 0)
2736 else if (*curpps < maxpps)
2741 #if 1 /* DIAGNOSTIC? */
2742 /* be careful about wrap-around */
2743 if (*curpps + 1 > *curpps)
2744 *curpps = *curpps + 1;
2747 * assume that there's not too many calls to this function.
2748 * not sure if the assumption holds, as it depends on *caller's*
2749 * behavior, not the behavior of this function.
2750 * IMHO it is wrong to make assumption on the caller's behavior,
2751 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2753 *curpps = *curpps + 1;
2761 * Perform rate limit check.
2762 * Returns 0 if it is okay to send the icmp6 packet.
2763 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2766 * XXX per-destination/type check necessary?
2769 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2770 const int type, /* not used at this moment */
2771 const int code) /* not used at this moment */
2775 ret = 0; /* okay to send */
2778 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2780 /* The packet is subject to rate limit */