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
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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.
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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
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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.
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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.
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46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
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50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
65 #include "opt_inet6.h"
66 #include "opt_ipsec.h"
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
72 #include <sys/protosw.h>
73 #include <sys/socket.h>
74 #include <sys/socketvar.h>
75 #include <sys/socketops.h>
77 #include <sys/kernel.h>
78 #include <sys/syslog.h>
79 #include <sys/domain.h>
81 #include <sys/thread2.h>
82 #include <sys/msgport2.h>
85 #include <net/route.h>
86 #include <net/if_dl.h>
87 #include <net/if_types.h>
89 #include <netinet/in.h>
90 #include <netinet/in_var.h>
91 #include <netinet/ip6.h>
92 #include <netinet6/ip6_var.h>
93 #include <netinet/icmp6.h>
94 #include <netinet6/mld6_var.h>
95 #include <netinet/in_pcb.h>
96 #include <netinet6/in6_pcb.h>
97 #include <netinet6/nd6.h>
98 #include <netinet6/in6_ifattach.h>
99 #include <netinet6/ip6protosw.h>
102 #include <netinet6/ipsec.h>
103 #include <netproto/key/key.h>
107 #include <netproto/ipsec/ipsec.h>
108 #include <netproto/ipsec/key.h>
112 #include <net/net_osdep.h>
114 #ifdef HAVE_NRL_INPCB
117 #define in6p_laddr inp_laddr6
118 #define in6p_faddr inp_faddr6
119 #define in6p_icmp6filt inp_icmp6filt
120 #define in6p_route inp_route
121 #define in6p_socket inp_socket
122 #define in6p_flags inp_flags
123 #define in6p_moptions inp_moptions6
124 #define in6p_outputopts inp_outputopts6
125 #define in6p_ip6 inp_ipv6
126 #define in6p_flowinfo inp_flowinfo
127 #define in6p_sp inp_sp
128 #define in6p_next inp_next
129 #define in6p_prev inp_prev
131 #define in6_pcbdetach in_pcbdetach
132 #define in6_rtchange in_rtchange
135 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from
138 #define in6p_ip6_nxt inp_ipv6.ip6_nxt
142 * ppratecheck() is available, so define it here.
144 #define HAVE_PPSRATECHECK
146 extern struct domain inet6domain;
147 extern struct protosw inet6sw[];
148 extern u_char ip6_protox[];
150 struct icmp6stat icmp6stat;
152 extern struct inpcbinfo ripcbinfo;
153 extern int icmp6errppslim;
154 static int icmp6errpps_count = 0;
155 static struct timeval icmp6errppslim_last;
156 extern int icmp6_nodeinfo;
158 static void icmp6_errcount (struct icmp6errstat *, int, int);
159 static int icmp6_rip6_input (struct mbuf **, int);
160 static int icmp6_ratelimit (const struct in6_addr *, const int, const int);
161 static const char *icmp6_redirect_diag (struct in6_addr *,
162 struct in6_addr *, struct in6_addr *);
163 #ifndef HAVE_PPSRATECHECK
164 static int ppsratecheck (struct timeval *, int *, int);
166 static struct mbuf *ni6_input (struct mbuf *, int);
167 static struct mbuf *ni6_nametodns (const char *, int, int);
168 static int ni6_dnsmatch (const char *, int, const char *, int);
169 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *,
170 struct ifnet **, char *);
171 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
172 struct ifnet *, int);
173 static int icmp6_notify_error (struct mbuf *, int, int, int);
175 #ifdef COMPAT_RFC1885
176 static struct route_in6 icmp6_reflect_rt;
187 icmp6_errcount(struct icmp6errstat *stat, int type, int code)
190 case ICMP6_DST_UNREACH:
192 case ICMP6_DST_UNREACH_NOROUTE:
193 stat->icp6errs_dst_unreach_noroute++;
195 case ICMP6_DST_UNREACH_ADMIN:
196 stat->icp6errs_dst_unreach_admin++;
198 case ICMP6_DST_UNREACH_BEYONDSCOPE:
199 stat->icp6errs_dst_unreach_beyondscope++;
201 case ICMP6_DST_UNREACH_ADDR:
202 stat->icp6errs_dst_unreach_addr++;
204 case ICMP6_DST_UNREACH_NOPORT:
205 stat->icp6errs_dst_unreach_noport++;
209 case ICMP6_PACKET_TOO_BIG:
210 stat->icp6errs_packet_too_big++;
212 case ICMP6_TIME_EXCEEDED:
214 case ICMP6_TIME_EXCEED_TRANSIT:
215 stat->icp6errs_time_exceed_transit++;
217 case ICMP6_TIME_EXCEED_REASSEMBLY:
218 stat->icp6errs_time_exceed_reassembly++;
222 case ICMP6_PARAM_PROB:
224 case ICMP6_PARAMPROB_HEADER:
225 stat->icp6errs_paramprob_header++;
227 case ICMP6_PARAMPROB_NEXTHEADER:
228 stat->icp6errs_paramprob_nextheader++;
230 case ICMP6_PARAMPROB_OPTION:
231 stat->icp6errs_paramprob_option++;
236 stat->icp6errs_redirect++;
239 stat->icp6errs_unknown++;
243 * Generate an error packet of type error in response to bad IP6 packet.
246 icmp6_error(struct mbuf *m, int type, int code, int param)
248 struct ip6_hdr *oip6, *nip6;
249 struct icmp6_hdr *icmp6;
254 icmp6stat.icp6s_error++;
256 /* count per-type-code statistics */
257 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
259 #ifdef M_DECRYPTED /*not openbsd*/
260 if (m->m_flags & M_DECRYPTED) {
261 icmp6stat.icp6s_canterror++;
266 #ifndef PULLDOWN_TEST
267 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
269 if (m->m_len < sizeof(struct ip6_hdr)) {
270 m = m_pullup(m, sizeof(struct ip6_hdr));
275 oip6 = mtod(m, struct ip6_hdr *);
278 * Multicast destination check. For unrecognized option errors,
279 * this check has already done in ip6_unknown_opt(), so we can
280 * check only for other errors.
282 if ((m->m_flags & (M_BCAST|M_MCAST) ||
283 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
284 (type != ICMP6_PACKET_TOO_BIG &&
285 (type != ICMP6_PARAM_PROB ||
286 code != ICMP6_PARAMPROB_OPTION)))
289 /* Source address check. XXX: the case of anycast source? */
290 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
291 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
295 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
299 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
300 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
301 struct icmp6_hdr *icp;
303 #ifndef PULLDOWN_TEST
304 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
305 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
307 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
310 icmp6stat.icp6s_tooshort++;
314 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
315 icp->icmp6_type == ND_REDIRECT) {
318 * Special case: for redirect (which is
319 * informational) we must not send icmp6 error.
321 icmp6stat.icp6s_canterror++;
324 /* ICMPv6 informational - send the error */
327 /* non-ICMPv6 - send the error */
330 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
332 /* Finally, do rate limitation check. */
333 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
334 icmp6stat.icp6s_toofreq++;
339 * OK, ICMP6 can be generated.
342 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
343 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
345 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
346 M_PREPEND(m, preplen, M_NOWAIT);
347 if (m && m->m_len < preplen)
348 m = m_pullup(m, preplen);
350 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
354 nip6 = mtod(m, struct ip6_hdr *);
355 nip6->ip6_src = oip6->ip6_src;
356 nip6->ip6_dst = oip6->ip6_dst;
358 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src))
359 oip6->ip6_src.s6_addr16[1] = 0;
360 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst))
361 oip6->ip6_dst.s6_addr16[1] = 0;
363 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
364 icmp6->icmp6_type = type;
365 icmp6->icmp6_code = code;
366 icmp6->icmp6_pptr = htonl((u_int32_t)param);
369 * icmp6_reflect() is designed to be in the input path.
370 * icmp6_error() can be called from both input and outut path,
371 * and if we are in output path rcvif could contain bogus value.
372 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
373 * information in ip header (nip6).
375 m->m_pkthdr.rcvif = NULL;
377 icmp6stat.icp6s_outhist[type]++;
378 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
384 * If we can't tell wheter or not we can generate ICMP6, free it.
390 * Process a received ICMP6 message.
393 icmp6_input(struct mbuf **mp, int *offp, int proto)
395 struct mbuf *m = *mp, *n;
396 struct ip6_hdr *ip6, *nip6;
397 struct icmp6_hdr *icmp6, *nicmp6;
399 int icmp6len = m->m_pkthdr.len - *offp;
402 #ifndef PULLDOWN_TEST
403 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
404 /* m might change if M_LOOP. So, call mtod after this */
408 * Locate icmp6 structure in mbuf, and check
409 * that not corrupted and of at least minimum length
412 ip6 = mtod(m, struct ip6_hdr *);
413 if (icmp6len < sizeof(struct icmp6_hdr)) {
414 icmp6stat.icp6s_tooshort++;
419 * calculate the checksum
421 #ifndef PULLDOWN_TEST
422 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
424 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
426 icmp6stat.icp6s_tooshort++;
430 code = icmp6->icmp6_code;
432 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
434 "ICMP6 checksum error(%d|%x) %s\n",
435 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)));
436 icmp6stat.icp6s_checksum++;
440 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
442 * Deliver very specific ICMP6 type only.
443 * This is important to deilver TOOBIG. Otherwise PMTUD
446 switch (icmp6->icmp6_type) {
447 case ICMP6_DST_UNREACH:
448 case ICMP6_PACKET_TOO_BIG:
449 case ICMP6_TIME_EXCEEDED:
456 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
457 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
458 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
459 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
461 switch (icmp6->icmp6_type) {
462 case ICMP6_DST_UNREACH:
463 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
465 case ICMP6_DST_UNREACH_NOROUTE:
466 code = PRC_UNREACH_NET;
468 case ICMP6_DST_UNREACH_ADMIN:
469 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
470 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
472 case ICMP6_DST_UNREACH_ADDR:
475 #ifdef COMPAT_RFC1885
476 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
477 code = PRC_UNREACH_SRCFAIL;
480 case ICMP6_DST_UNREACH_BEYONDSCOPE:
481 /* I mean "source address was incorrect." */
482 code = PRC_PARAMPROB;
485 case ICMP6_DST_UNREACH_NOPORT:
486 code = PRC_UNREACH_PORT;
494 case ICMP6_PACKET_TOO_BIG:
495 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
502 * Updating the path MTU will be done after examining
503 * intermediate extension headers.
508 case ICMP6_TIME_EXCEEDED:
509 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
511 case ICMP6_TIME_EXCEED_TRANSIT:
512 case ICMP6_TIME_EXCEED_REASSEMBLY:
513 code += PRC_TIMXCEED_INTRANS;
521 case ICMP6_PARAM_PROB:
522 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
524 case ICMP6_PARAMPROB_NEXTHEADER:
525 code = PRC_UNREACH_PROTOCOL;
527 case ICMP6_PARAMPROB_HEADER:
528 case ICMP6_PARAMPROB_OPTION:
529 code = PRC_PARAMPROB;
537 case ICMP6_ECHO_REQUEST:
538 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
541 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
545 if ((n->m_flags & M_EXT) ||
546 n->m_len < off + sizeof(struct icmp6_hdr)) {
548 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
552 * Prepare an internal mbuf. m_pullup() doesn't
553 * always copy the length we specified.
555 if (maxlen >= MCLBYTES) {
560 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR);
566 n0len = n0->m_pkthdr.len; /* save for use below */
567 M_MOVE_PKTHDR(n, n0);
569 * Copy IPv6 and ICMPv6 only.
571 nip6 = mtod(n, struct ip6_hdr *);
572 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
573 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
574 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
575 noff = sizeof(struct ip6_hdr);
576 /* new mbuf contains only ipv6+icmpv6 headers */
577 n->m_len = noff + sizeof(struct icmp6_hdr);
579 * Adjust mbuf. ip6_plen will be adjusted in
582 m_adj(n0, off + sizeof(struct icmp6_hdr));
583 /* recalculate complete packet size */
584 n->m_pkthdr.len = n0len + (noff - off);
587 nip6 = mtod(n, struct ip6_hdr *);
588 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off);
591 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
592 nicmp6->icmp6_code = 0;
594 icmp6stat.icp6s_reflect++;
595 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
596 icmp6_reflect(n, noff);
600 case ICMP6_ECHO_REPLY:
601 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
606 case MLD_LISTENER_QUERY:
607 case MLD_LISTENER_REPORT:
608 if (icmp6len < sizeof(struct mld_hdr))
610 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
613 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
614 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
624 case MLD_LISTENER_DONE:
625 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
626 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
628 break; /* nothing to be done in kernel */
630 case MLD_MTRACE_RESP:
632 /* XXX: these two are experimental. not officially defind. */
633 /* XXX: per-interface statistics? */
634 break; /* just pass it to applications */
636 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
638 enum { WRU, FQDN } mode;
643 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
645 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
650 #define hostnamelen strlen(hostname)
652 #ifndef PULLDOWN_TEST
653 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
656 n = m_copy(m, 0, M_COPYALL);
658 n = ni6_input(n, off);
659 /* XXX meaningless if n == NULL */
660 noff = sizeof(struct ip6_hdr);
665 if ((icmp6_nodeinfo & 5) != 5)
670 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
671 if (maxlen >= MCLBYTES) {
675 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR);
680 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
682 * Previous code did a blind M_COPY_PKTHDR
683 * and said "just for rcvif". If true, then
684 * we could tolerate the dup failing (due to
685 * the deep copy of the tag chain). For now
686 * be conservative and just fail.
692 maxhlen = M_TRAILINGSPACE(n) - maxlen;
693 if (maxhlen > hostnamelen)
694 maxhlen = hostnamelen;
696 * Copy IPv6 and ICMPv6 only.
698 nip6 = mtod(n, struct ip6_hdr *);
699 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
700 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
701 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
702 p = (u_char *)(nicmp6 + 1);
704 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
705 noff = sizeof(struct ip6_hdr);
706 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
707 sizeof(struct icmp6_hdr) + 4 + maxhlen;
708 nicmp6->icmp6_type = ICMP6_WRUREPLY;
709 nicmp6->icmp6_code = 0;
713 icmp6stat.icp6s_reflect++;
714 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
715 icmp6_reflect(n, noff);
725 case ND_ROUTER_SOLICIT:
726 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
729 if (icmp6len < sizeof(struct nd_router_solicit))
731 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
733 nd6_rs_input(m, off, icmp6len);
737 nd6_rs_input(n, off, icmp6len);
741 case ND_ROUTER_ADVERT:
742 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
745 if (icmp6len < sizeof(struct nd_router_advert))
747 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
749 nd6_ra_input(m, off, icmp6len);
753 nd6_ra_input(n, off, icmp6len);
757 case ND_NEIGHBOR_SOLICIT:
758 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
761 if (icmp6len < sizeof(struct nd_neighbor_solicit))
763 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
765 nd6_ns_input(m, off, icmp6len);
769 nd6_ns_input(n, off, icmp6len);
773 case ND_NEIGHBOR_ADVERT:
774 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
777 if (icmp6len < sizeof(struct nd_neighbor_advert))
779 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
781 nd6_na_input(m, off, icmp6len);
785 nd6_na_input(n, off, icmp6len);
790 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
793 if (icmp6len < sizeof(struct nd_redirect))
795 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
797 icmp6_redirect_input(m, off);
801 icmp6_redirect_input(n, off);
805 case ICMP6_ROUTER_RENUMBERING:
806 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
807 code != ICMP6_ROUTER_RENUMBERING_RESULT)
809 if (icmp6len < sizeof(struct icmp6_router_renum))
815 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
816 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src),
817 ip6_sprintf(&ip6->ip6_dst),
818 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
819 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
820 /* ICMPv6 error: MUST deliver it by spec... */
824 /* ICMPv6 informational: MUST not deliver */
828 if (icmp6_notify_error(m, off, icmp6len, code)) {
829 /* In this case, m should've been freed. */
830 return (IPPROTO_DONE);
835 icmp6stat.icp6s_badcode++;
839 icmp6stat.icp6s_badlen++;
843 /* deliver the packet to appropriate sockets */
844 icmp6_rip6_input(&m, *offp);
854 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code)
856 struct icmp6_hdr *icmp6;
857 struct ip6_hdr *eip6;
859 struct sockaddr_in6 icmp6src, icmp6dst;
861 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
862 icmp6stat.icp6s_tooshort++;
865 #ifndef PULLDOWN_TEST
866 IP6_EXTHDR_CHECK(m, off,
867 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr),
869 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
871 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
872 sizeof(*icmp6) + sizeof(struct ip6_hdr));
874 icmp6stat.icp6s_tooshort++;
878 eip6 = (struct ip6_hdr *)(icmp6 + 1);
880 /* Detect the upper level protocol */
882 u_int8_t nxt = eip6->ip6_nxt;
883 int eoff = off + sizeof(struct icmp6_hdr) +
884 sizeof(struct ip6_hdr);
885 struct ip6ctlparam ip6cp;
886 struct in6_addr *finaldst = NULL;
887 int icmp6type = icmp6->icmp6_type;
889 struct ip6_rthdr *rth;
892 while (1) { /* XXX: should avoid infinite loop explicitly? */
896 case IPPROTO_HOPOPTS:
897 case IPPROTO_DSTOPTS:
899 #ifndef PULLDOWN_TEST
900 IP6_EXTHDR_CHECK(m, 0, eoff +
901 sizeof(struct ip6_ext),
903 eh = (struct ip6_ext *)(mtod(m, caddr_t)
906 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
909 icmp6stat.icp6s_tooshort++;
914 if (nxt == IPPROTO_AH)
915 eoff += (eh->ip6e_len + 2) << 2;
917 eoff += (eh->ip6e_len + 1) << 3;
920 case IPPROTO_ROUTING:
922 * When the erroneous packet contains a
923 * routing header, we should examine the
924 * header to determine the final destination.
925 * Otherwise, we can't properly update
926 * information that depends on the final
927 * destination (e.g. path MTU).
929 #ifndef PULLDOWN_TEST
930 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth),
932 rth = (struct ip6_rthdr *)(mtod(m, caddr_t)
935 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
938 icmp6stat.icp6s_tooshort++;
942 rthlen = (rth->ip6r_len + 1) << 3;
946 case IPPROTO_FRAGMENT:
947 #ifndef PULLDOWN_TEST
948 IP6_EXTHDR_CHECK(m, 0, eoff +
949 sizeof(struct ip6_frag),
951 fh = (struct ip6_frag *)(mtod(m, caddr_t)
954 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
957 icmp6stat.icp6s_tooshort++;
962 * Data after a fragment header is meaningless
963 * unless it is the first fragment, but
964 * we'll go to the notify label for path MTU
967 if (fh->ip6f_offlg & IP6F_OFF_MASK)
970 eoff += sizeof(struct ip6_frag);
975 * This case includes ESP and the No Next
976 * Header. In such cases going to the notify
977 * label does not have any meaning
978 * (i.e. pr_ctlinput will be NULL), but we go
979 * anyway since we might have to update
980 * path MTU information.
986 #ifndef PULLDOWN_TEST
987 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
989 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
990 sizeof(*icmp6) + sizeof(struct ip6_hdr));
992 icmp6stat.icp6s_tooshort++;
997 eip6 = (struct ip6_hdr *)(icmp6 + 1);
998 bzero(&icmp6dst, sizeof(icmp6dst));
999 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1000 icmp6dst.sin6_family = AF_INET6;
1001 if (finaldst == NULL)
1002 icmp6dst.sin6_addr = eip6->ip6_dst;
1004 icmp6dst.sin6_addr = *finaldst;
1005 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1006 &icmp6dst.sin6_addr);
1007 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst,
1009 /* should be impossbile */
1011 "icmp6_notify_error: in6_embedscope failed\n"));
1016 * retrieve parameters from the inner IPv6 header, and convert
1017 * them into sockaddr structures.
1019 bzero(&icmp6src, sizeof(icmp6src));
1020 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1021 icmp6src.sin6_family = AF_INET6;
1022 icmp6src.sin6_addr = eip6->ip6_src;
1023 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1024 &icmp6src.sin6_addr);
1025 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src,
1027 /* should be impossbile */
1029 "icmp6_notify_error: in6_embedscope failed\n"));
1032 icmp6src.sin6_flowinfo =
1033 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1035 if (finaldst == NULL)
1036 finaldst = &eip6->ip6_dst;
1038 ip6cp.ip6c_icmp6 = icmp6;
1039 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1040 ip6cp.ip6c_off = eoff;
1041 ip6cp.ip6c_finaldst = finaldst;
1042 ip6cp.ip6c_src = &icmp6src;
1043 ip6cp.ip6c_nxt = nxt;
1045 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1046 notifymtu = ntohl(icmp6->icmp6_mtu);
1047 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1048 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1052 &inet6sw[ip6_protox[nxt]],
1053 code, (struct sockaddr *)&icmp6dst, &ip6cp);
1063 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1065 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1066 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1067 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1068 u_int mtu = ntohl(icmp6->icmp6_mtu);
1069 struct rtentry *rt = NULL;
1070 struct sockaddr_in6 sin6;
1075 bzero(&sin6, sizeof(sin6));
1076 sin6.sin6_family = PF_INET6;
1077 sin6.sin6_len = sizeof(struct sockaddr_in6);
1078 sin6.sin6_addr = *dst;
1079 /* XXX normally, this won't happen */
1080 if (IN6_IS_ADDR_LINKLOCAL(dst)) {
1081 sin6.sin6_addr.s6_addr16[1] =
1082 htons(m->m_pkthdr.rcvif->if_index);
1084 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */
1085 rt = rtpurelookup((struct sockaddr *)&sin6);
1086 if (rt != NULL && (rt->rt_flags & RTF_HOST) &&
1087 !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
1088 if (mtu < IPV6_MMTU) { /* XXX */
1089 rt->rt_rmx.rmx_locks |= RTV_MTU;
1090 } else if (mtu < rt->rt_ifp->if_mtu &&
1091 rt->rt_rmx.rmx_mtu > mtu) {
1092 icmp6stat.icp6s_pmtuchg++;
1093 rt->rt_rmx.rmx_mtu = mtu;
1101 * Process a Node Information Query packet, based on
1102 * draft-ietf-ipngwg-icmp-name-lookups-07.
1104 * Spec incompatibilities:
1105 * - IPv6 Subject address handling
1106 * - IPv4 Subject address handling support missing
1107 * - Proxy reply (answer even if it's not for me)
1108 * - joins NI group address at in6_ifattach() time only, does not cope
1109 * with hostname changes by sethostname(3)
1111 #define hostnamelen strlen(hostname)
1112 static struct mbuf *
1113 ni6_input(struct mbuf *m, int off)
1115 struct icmp6_nodeinfo *ni6, *nni6;
1116 struct mbuf *n = NULL;
1119 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1120 struct ni_reply_fqdn *fqdn;
1121 int addrs; /* for NI_QTYPE_NODEADDR */
1122 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1123 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */
1124 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */
1125 struct ip6_hdr *ip6;
1126 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1128 struct in6_ifaddr *ia6 = NULL;
1130 ip6 = mtod(m, struct ip6_hdr *);
1131 #ifndef PULLDOWN_TEST
1132 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1134 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1136 /* m is already reclaimed */
1142 * Validate IPv6 destination address.
1144 * The Responder must discard the Query without further processing
1145 * unless it is one of the Responder's unicast or anycast addresses, or
1146 * a link-local scope multicast address which the Responder has joined.
1147 * [icmp-name-lookups-07, Section 4.]
1149 bzero(&sin6, sizeof(sin6));
1150 sin6.sin6_family = AF_INET6;
1151 sin6.sin6_len = sizeof(struct sockaddr_in6);
1152 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
1154 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) {
1155 /* unicast/anycast, fine */
1156 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1157 (icmp6_nodeinfo & 4) == 0) {
1158 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1159 "a temporary address in %s:%d",
1160 __FILE__, __LINE__));
1163 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr))
1164 ; /* link-local multicast, fine */
1168 /* validate query Subject field. */
1169 qtype = ntohs(ni6->ni_qtype);
1170 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1173 case NI_QTYPE_SUPTYPES:
1175 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1179 case NI_QTYPE_NODEADDR:
1180 switch (ni6->ni_code) {
1181 case ICMP6_NI_SUBJ_IPV6:
1182 #if ICMP6_NI_SUBJ_IPV6 != 0
1186 * backward compatibility - try to accept 03 draft
1187 * format, where no Subject is present.
1189 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1194 #if ICMP6_NI_SUBJ_IPV6 != 0
1195 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1199 if (subjlen != sizeof(sin6.sin6_addr))
1203 * Validate Subject address.
1205 * Not sure what exactly "address belongs to the node"
1206 * means in the spec, is it just unicast, or what?
1208 * At this moment we consider Subject address as
1209 * "belong to the node" if the Subject address equals
1210 * to the IPv6 destination address; validation for
1211 * IPv6 destination address should have done enough
1214 * We do not do proxy at this moment.
1216 /* m_pulldown instead of copy? */
1217 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1218 subjlen, (caddr_t)&sin6.sin6_addr);
1219 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1221 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL);
1222 bzero(&sin6_d, sizeof(sin6_d));
1223 sin6_d.sin6_family = AF_INET6; /* not used, actually */
1224 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */
1225 sin6_d.sin6_addr = ip6->ip6_dst;
1226 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif,
1228 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL);
1229 subj = (char *)&sin6;
1230 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d))
1234 * XXX if we are to allow other cases, we should really
1235 * be careful about scope here.
1236 * basically, we should disallow queries toward IPv6
1237 * destination X with subject Y, if scope(X) > scope(Y).
1238 * if we allow scope(X) > scope(Y), it will result in
1239 * information leakage across scope boundary.
1243 case ICMP6_NI_SUBJ_FQDN:
1245 * Validate Subject name with gethostname(3).
1247 * The behavior may need some debate, since:
1248 * - we are not sure if the node has FQDN as
1249 * hostname (returned by gethostname(3)).
1250 * - the code does wildcard match for truncated names.
1251 * however, we are not sure if we want to perform
1252 * wildcard match, if gethostname(3) side has
1253 * truncated hostname.
1255 n = ni6_nametodns(hostname, hostnamelen, 0);
1256 if (!n || n->m_next || n->m_len == 0)
1258 IP6_EXTHDR_GET(subj, char *, m,
1259 off + sizeof(struct icmp6_nodeinfo), subjlen);
1262 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1270 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1277 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1280 if ((icmp6_nodeinfo & 1) == 0)
1283 case NI_QTYPE_NODEADDR:
1284 if ((icmp6_nodeinfo & 2) == 0)
1289 /* guess reply length */
1292 break; /* no reply data */
1293 case NI_QTYPE_SUPTYPES:
1294 replylen += sizeof(u_int32_t);
1297 /* XXX will append an mbuf */
1298 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1300 case NI_QTYPE_NODEADDR:
1301 addrs = ni6_addrs(ni6, m, &ifp, subj);
1302 if ((replylen += addrs * (sizeof(struct in6_addr) +
1303 sizeof(u_int32_t))) > MCLBYTES)
1304 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1308 * XXX: We must return a reply with the ICMP6 code
1309 * `unknown Qtype' in this case. However we regard the case
1310 * as an FQDN query for backward compatibility.
1311 * Older versions set a random value to this field,
1312 * so it rarely varies in the defined qtypes.
1313 * But the mechanism is not reliable...
1314 * maybe we should obsolete older versions.
1316 qtype = NI_QTYPE_FQDN;
1317 /* XXX will append an mbuf */
1318 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1323 /* allocate an mbuf to reply. */
1324 if (replylen > MCLBYTES) {
1326 * XXX: should we try to allocate more? But MCLBYTES
1327 * is probably much larger than IPV6_MMTU...
1331 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR);
1336 M_MOVE_PKTHDR(n, m); /* just for recvif */
1337 n->m_pkthdr.len = n->m_len = replylen;
1339 /* copy mbuf header and IPv6 + Node Information base headers */
1340 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1341 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1342 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1344 /* qtype dependent procedure */
1347 nni6->ni_code = ICMP6_NI_SUCCESS;
1350 case NI_QTYPE_SUPTYPES:
1353 nni6->ni_code = ICMP6_NI_SUCCESS;
1354 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1355 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1356 v = (u_int32_t)htonl(0x0000000f);
1357 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1361 nni6->ni_code = ICMP6_NI_SUCCESS;
1362 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1363 sizeof(struct ip6_hdr) +
1364 sizeof(struct icmp6_nodeinfo));
1365 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1366 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1368 * XXX do we really have FQDN in variable "hostname"?
1370 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
1371 if (n->m_next == NULL)
1373 /* XXX we assume that n->m_next is not a chain */
1374 if (n->m_next->m_next != NULL)
1376 n->m_pkthdr.len += n->m_next->m_len;
1378 case NI_QTYPE_NODEADDR:
1382 nni6->ni_code = ICMP6_NI_SUCCESS;
1383 n->m_pkthdr.len = n->m_len =
1384 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1385 lenlim = M_TRAILINGSPACE(n);
1386 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1387 /* XXX: reset mbuf length */
1388 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1389 sizeof(struct icmp6_nodeinfo) + copied;
1393 break; /* XXX impossible! */
1396 nni6->ni_type = ICMP6_NI_REPLY;
1409 * make a mbuf with DNS-encoded string. no compression support.
1411 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1412 * treated as truncated name (two \0 at the end). this is a wild guess.
1414 static struct mbuf *
1415 ni6_nametodns(const char *name, int namelen,
1416 int old) /* return pascal string if non-zero */
1428 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1429 m = m_getb(len, M_NOWAIT, MT_DATA, 0);
1435 *mtod(m, char *) = namelen;
1436 bcopy(name, mtod(m, char *) + 1, namelen);
1440 cp = mtod(m, char *);
1441 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1443 /* if not certain about my name, return empty buffer */
1448 * guess if it looks like shortened hostname, or FQDN.
1449 * shortened hostname needs two trailing "\0".
1452 for (p = name; p < name + namelen; p++) {
1453 if (*p && *p == '.')
1462 while (cp < ep && p < name + namelen) {
1464 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1466 /* result does not fit into mbuf */
1467 if (cp + i + 1 >= ep)
1470 * DNS label length restriction, RFC1035 page 8.
1471 * "i == 0" case is included here to avoid returning
1472 * 0-length label on "foo..bar".
1474 if (i <= 0 || i >= 64)
1480 if (p < name + namelen && *p == '.')
1484 if (cp + nterm >= ep)
1488 m->m_len = cp - mtod(m, char *);
1492 panic("should not reach here");
1502 * check if two DNS-encoded string matches. takes care of truncated
1503 * form (with \0\0 at the end). no compression support.
1504 * XXX upper/lowercase match (see RFC2065)
1507 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1509 const char *a0, *b0;
1512 /* simplest case - need validation? */
1513 if (alen == blen && bcmp(a, b, alen) == 0)
1519 /* termination is mandatory */
1520 if (alen < 2 || blen < 2)
1522 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1527 while (a - a0 < alen && b - b0 < blen) {
1528 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1531 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1533 /* we don't support compression yet */
1534 if (a[0] >= 64 || b[0] >= 64)
1537 /* truncated case */
1538 if (a[0] == 0 && a - a0 == alen - 1)
1540 if (b[0] == 0 && b - b0 == blen - 1)
1542 if (a[0] == 0 || b[0] == 0)
1548 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1550 if (bcmp(a + 1, b + 1, l) != 0)
1557 if (a - a0 == alen && b - b0 == blen)
1564 * calculate the number of addresses to be returned in the node info reply.
1567 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1570 const struct ifnet_array *arr;
1571 struct in6_ifaddr *ifa6;
1572 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */
1573 int addrs = 0, addrsofif, iffound = 0;
1574 int niflags = ni6->ni_flags;
1577 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1578 switch (ni6->ni_code) {
1579 case ICMP6_NI_SUBJ_IPV6:
1580 if (subj == NULL) /* must be impossible... */
1582 subj_ip6 = (struct sockaddr_in6 *)subj;
1586 * XXX: we only support IPv6 subject address for
1593 arr = ifnet_array_get();
1594 for (i = 0; i < arr->ifnet_count; ++i) {
1595 struct ifnet *ifp = arr->ifnet_arr[i];
1596 struct ifaddr_container *ifac;
1599 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link)
1601 struct ifaddr *ifa = ifac->ifa;
1603 if (ifa->ifa_addr->sa_family != AF_INET6)
1605 ifa6 = (struct in6_ifaddr *)ifa;
1607 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1608 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr,
1609 &ifa6->ia_addr.sin6_addr))
1613 * IPv4-mapped addresses can only be returned by a
1614 * Node Information proxy, since they represent
1615 * addresses of IPv4-only nodes, which perforce do
1616 * not implement this protocol.
1617 * [icmp-name-lookups-07, Section 5.4]
1618 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1619 * this function at this moment.
1622 /* What do we have to do about ::1? */
1623 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1624 case IPV6_ADDR_SCOPE_LINKLOCAL:
1625 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1628 case IPV6_ADDR_SCOPE_SITELOCAL:
1629 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1632 case IPV6_ADDR_SCOPE_GLOBAL:
1633 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1641 * check if anycast is okay.
1642 * XXX: just experimental. not in the spec.
1644 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1645 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1646 continue; /* we need only unicast addresses */
1647 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1648 (icmp6_nodeinfo & 4) == 0) {
1651 addrsofif++; /* count the address */
1665 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1666 struct ifnet *ifp0, int resid)
1668 const struct ifnet_array *arr;
1669 struct in6_ifaddr *ifa6;
1670 int copied = 0, allow_deprecated = 0;
1671 u_char *cp = (u_char *)(nni6 + 1);
1672 int niflags = ni6->ni_flags;
1674 int idx, idx_dep = -1;
1676 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1677 return (0); /* needless to copy */
1679 arr = ifnet_array_get();
1683 for (idx = 0; idx < arr->ifnet_count; ++idx) {
1684 if (arr->ifnet_arr[idx] == ifp0)
1691 for (; idx < arr->ifnet_count; ++idx) {
1692 struct ifnet *ifp = arr->ifnet_arr[idx];
1693 struct ifaddr_container *ifac;
1695 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1696 struct ifaddr *ifa = ifac->ifa;
1698 if (ifa->ifa_addr->sa_family != AF_INET6)
1700 ifa6 = (struct in6_ifaddr *)ifa;
1702 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1703 allow_deprecated == 0) {
1705 * prefererred address should be put before
1706 * deprecated addresses.
1709 /* record the interface for later search */
1715 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) &&
1716 allow_deprecated != 0)
1717 continue; /* we now collect deprecated addrs */
1719 /* What do we have to do about ::1? */
1720 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1721 case IPV6_ADDR_SCOPE_LINKLOCAL:
1722 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1725 case IPV6_ADDR_SCOPE_SITELOCAL:
1726 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1729 case IPV6_ADDR_SCOPE_GLOBAL:
1730 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1738 * check if anycast is okay.
1739 * XXX: just experimental. not in the spec.
1741 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) &&
1742 !(niflags & NI_NODEADDR_FLAG_ANYCAST))
1744 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) &&
1745 (icmp6_nodeinfo & 4) == 0) {
1749 /* now we can copy the address */
1750 if (resid < sizeof(struct in6_addr) +
1751 sizeof(u_int32_t)) {
1753 * We give up much more copy.
1754 * Set the truncate flag and return.
1757 NI_NODEADDR_FLAG_TRUNCATE;
1762 * Set the TTL of the address.
1763 * The TTL value should be one of the following
1764 * according to the specification:
1766 * 1. The remaining lifetime of a DHCP lease on the
1768 * 2. The remaining Valid Lifetime of a prefix from
1769 * which the address was derived through Stateless
1770 * Autoconfiguration.
1772 * Note that we currently do not support stateful
1773 * address configuration by DHCPv6, so the former
1774 * case can't happen.
1776 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1777 ltime = ND6_INFINITE_LIFETIME;
1779 if (ifa6->ia6_lifetime.ia6t_expire >
1781 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1786 bcopy(<ime, cp, sizeof(u_int32_t));
1787 cp += sizeof(u_int32_t);
1789 /* copy the address itself */
1790 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1791 sizeof(struct in6_addr));
1792 /* XXX: KAME link-local hack; remove ifindex */
1793 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr))
1794 ((struct in6_addr *)cp)->s6_addr16[1] = 0;
1795 cp += sizeof(struct in6_addr);
1797 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1798 copied += (sizeof(struct in6_addr) +
1801 if (ifp0) /* we need search only on the specified IF */
1805 if (allow_deprecated == 0 && idx_dep >= 0) {
1807 allow_deprecated = 1;
1816 * XXX almost dup'ed code with rip6_input.
1819 icmp6_rip6_input(struct mbuf **mp, int off)
1821 struct mbuf *m = *mp;
1822 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1823 struct in6pcb *in6p;
1824 struct in6pcb *last = NULL;
1825 struct sockaddr_in6 rip6src;
1826 struct icmp6_hdr *icmp6;
1827 struct mbuf *opts = NULL;
1829 #ifndef PULLDOWN_TEST
1830 /* this is assumed to be safe. */
1831 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1833 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1834 if (icmp6 == NULL) {
1835 /* m is already reclaimed */
1836 return IPPROTO_DONE;
1840 bzero(&rip6src, sizeof(rip6src));
1841 rip6src.sin6_len = sizeof(struct sockaddr_in6);
1842 rip6src.sin6_family = AF_INET6;
1843 /* KAME hack: recover scopeid */
1844 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif);
1846 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list)
1848 if (in6p->inp_flags & INP_PLACEMARKER)
1850 if (!INP_ISIPV6(in6p))
1852 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
1854 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1855 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1857 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1858 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1860 if (in6p->in6p_icmp6filt
1861 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1862 in6p->in6p_icmp6filt))
1868 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1869 if (last->in6p_flags & IN6P_CONTROLOPTS)
1870 ip6_savecontrol(last, &opts, ip6, n);
1871 /* strip intermediate headers */
1873 so = last->in6p_socket;
1874 lwkt_gettoken(&so->so_rcv.ssb_token);
1875 if (ssb_appendaddr(&so->so_rcv,
1876 (struct sockaddr *)&rip6src,
1878 /* should notify about lost packet */
1885 lwkt_reltoken(&so->so_rcv.ssb_token);
1894 if (last->in6p_flags & IN6P_CONTROLOPTS)
1895 ip6_savecontrol(last, &opts, ip6, m);
1896 /* strip intermediate headers */
1898 so = last->in6p_socket;
1899 lwkt_gettoken(&so->so_rcv.ssb_token);
1900 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src,
1908 lwkt_reltoken(&so->so_rcv.ssb_token);
1911 ip6stat.ip6s_delivered--;
1913 return IPPROTO_DONE;
1917 * Reflect the ip6 packet back to the source.
1918 * OFF points to the icmp6 header, counted from the top of the mbuf.
1921 icmp6_reflect(struct mbuf *m, size_t off)
1923 struct ip6_hdr *ip6;
1924 struct icmp6_hdr *icmp6;
1925 struct in6_ifaddr *ia;
1926 struct in6_addr t, *src = NULL;
1929 struct ifnet *outif = NULL;
1930 struct sockaddr_in6 sa6_src, sa6_dst;
1931 #ifdef COMPAT_RFC1885
1932 int mtu = IPV6_MMTU;
1933 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst;
1936 /* too short to reflect */
1937 if (off < sizeof(struct ip6_hdr)) {
1939 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
1940 (u_long)off, (u_long)sizeof(struct ip6_hdr),
1941 __FILE__, __LINE__));
1946 * If there are extra headers between IPv6 and ICMPv6, strip
1947 * off that header first.
1950 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
1951 panic("assumption failed in icmp6_reflect");
1953 if (off > sizeof(struct ip6_hdr)) {
1955 struct ip6_hdr nip6;
1957 l = off - sizeof(struct ip6_hdr);
1958 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
1960 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1962 if ((m = m_pullup(m, l)) == NULL)
1965 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
1966 } else /* off == sizeof(struct ip6_hdr) */ {
1968 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
1970 if ((m = m_pullup(m, l)) == NULL)
1974 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
1975 ip6 = mtod(m, struct ip6_hdr *);
1976 ip6->ip6_nxt = IPPROTO_ICMPV6;
1977 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
1978 type = icmp6->icmp6_type; /* keep type for statistics */
1979 code = icmp6->icmp6_code; /* ditto. */
1983 * ip6_input() drops a packet if its src is multicast.
1984 * So, the src is never multicast.
1986 ip6->ip6_dst = ip6->ip6_src;
1989 * XXX: make sure to embed scope zone information, using
1990 * already embedded IDs or the received interface (if any).
1991 * Note that rcvif may be NULL.
1992 * TODO: scoped routing case (XXX).
1994 bzero(&sa6_src, sizeof(sa6_src));
1995 sa6_src.sin6_family = AF_INET6;
1996 sa6_src.sin6_len = sizeof(sa6_src);
1997 sa6_src.sin6_addr = ip6->ip6_dst;
1998 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif);
1999 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL);
2000 bzero(&sa6_dst, sizeof(sa6_dst));
2001 sa6_dst.sin6_family = AF_INET6;
2002 sa6_dst.sin6_len = sizeof(sa6_dst);
2003 sa6_dst.sin6_addr = t;
2004 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif);
2005 in6_embedscope(&t, &sa6_dst, NULL, NULL);
2007 #ifdef COMPAT_RFC1885
2010 * RFC 1885 requires that echo reply should be truncated if it
2011 * does not fit in with (return) path MTU, but the description was
2012 * removed in the new spec.
2014 if (icmp6_reflect_rt.ro_rt == 0 ||
2015 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) {
2016 if (icmp6_reflect_rt.ro_rt) {
2017 RTFREE(icmp6_reflect_rt.ro_rt);
2018 icmp6_reflect_rt.ro_rt = 0;
2020 bzero(sin6, sizeof(*sin6));
2021 sin6->sin6_family = PF_INET6;
2022 sin6->sin6_len = sizeof(struct sockaddr_in6);
2023 sin6->sin6_addr = ip6->ip6_dst;
2025 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt,
2029 if (icmp6_reflect_rt.ro_rt == 0)
2032 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST)
2033 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu)
2034 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu;
2036 if (mtu < m->m_pkthdr.len) {
2037 plen -= (m->m_pkthdr.len - mtu);
2038 m_adj(m, mtu - m->m_pkthdr.len);
2042 * If the incoming packet was addressed directly to us(i.e. unicast),
2043 * use dst as the src for the reply.
2044 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible
2045 * (for example) when we encounter an error while forwarding procedure
2046 * destined to a duplicated address of ours.
2048 for (ia = in6_ifaddr; ia; ia = ia->ia_next)
2049 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) &&
2050 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) {
2054 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) {
2056 * This is the case if the dst is our link-local address
2057 * and the sender is also ourselves.
2064 struct route_in6 ro;
2067 * This case matches to multicasts, our anycast, or unicasts
2068 * that we do not own. Select a source address based on the
2069 * source address of the erroneous packet.
2071 bzero(&ro, sizeof(ro));
2072 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL);
2074 RTFREE(ro.ro_rt); /* XXX: we could use this */
2077 "icmp6_reflect: source can't be determined: "
2078 "dst=%s, error=%d\n",
2079 ip6_sprintf(&sa6_src.sin6_addr), e));
2084 ip6->ip6_src = *src;
2087 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2088 ip6->ip6_vfc |= IPV6_VERSION;
2089 ip6->ip6_nxt = IPPROTO_ICMPV6;
2090 if (m->m_pkthdr.rcvif) {
2091 /* XXX: This may not be the outgoing interface */
2092 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2094 ip6->ip6_hlim = ip6_defhlim;
2096 icmp6->icmp6_cksum = 0;
2097 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2098 sizeof(struct ip6_hdr), plen);
2101 * XXX option handling
2104 m->m_flags &= ~(M_BCAST|M_MCAST);
2106 #ifdef COMPAT_RFC1885
2107 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL);
2109 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2112 icmp6_ifoutstat_inc(outif, type, code);
2122 icmp6_fasttimo(void)
2129 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2130 struct in6_addr *tgt6)
2132 static char buf[1024];
2133 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2134 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6));
2139 icmp6_redirect_input(struct mbuf *m, int off)
2141 struct ifnet *ifp = m->m_pkthdr.rcvif;
2142 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2143 struct nd_redirect *nd_rd;
2144 int icmp6len = ntohs(ip6->ip6_plen);
2145 char *lladdr = NULL;
2148 u_char *redirhdr = NULL;
2149 int redirhdrlen = 0;
2151 struct rtentry *rt = NULL;
2154 struct in6_addr src6 = ip6->ip6_src;
2155 struct in6_addr redtgt6;
2156 struct in6_addr reddst6;
2157 union nd_opts ndopts;
2162 /* XXX if we are router, we don't update route by icmp6 redirect */
2165 if (!icmp6_rediraccept)
2168 #ifndef PULLDOWN_TEST
2169 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2170 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2172 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2173 if (nd_rd == NULL) {
2174 icmp6stat.icp6s_tooshort++;
2178 redtgt6 = nd_rd->nd_rd_target;
2179 reddst6 = nd_rd->nd_rd_dst;
2181 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2182 redtgt6.s6_addr16[1] = htons(ifp->if_index);
2183 if (IN6_IS_ADDR_LINKLOCAL(&reddst6))
2184 reddst6.s6_addr16[1] = htons(ifp->if_index);
2187 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2189 "ICMP6 redirect sent from %s rejected; "
2190 "must be from linklocal\n", ip6_sprintf(&src6)));
2193 if (ip6->ip6_hlim != 255) {
2195 "ICMP6 redirect sent from %s rejected; "
2196 "hlim=%d (must be 255)\n",
2197 ip6_sprintf(&src6), ip6->ip6_hlim));
2201 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2202 struct sockaddr_in6 sin6;
2203 struct in6_addr *gw6;
2205 bzero(&sin6, sizeof(sin6));
2206 sin6.sin6_family = AF_INET6;
2207 sin6.sin6_len = sizeof(struct sockaddr_in6);
2208 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6);
2209 rt = rtpurelookup((struct sockaddr *)&sin6);
2211 if (rt->rt_gateway == NULL ||
2212 rt->rt_gateway->sa_family != AF_INET6) {
2214 "ICMP6 redirect rejected; no route "
2215 "with inet6 gateway found for redirect dst: %s\n",
2216 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2221 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2222 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2224 "ICMP6 redirect rejected; "
2225 "not equal to gw-for-src=%s (must be same): "
2228 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2234 "ICMP6 redirect rejected; "
2235 "no route found for redirect dst: %s\n",
2236 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2242 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2244 "ICMP6 redirect rejected; "
2245 "redirect dst must be unicast: %s\n",
2246 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2250 is_router = is_onlink = 0;
2251 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2252 is_router = 1; /* router case */
2253 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2254 is_onlink = 1; /* on-link destination case */
2255 if (!is_router && !is_onlink) {
2257 "ICMP6 redirect rejected; "
2258 "neither router case nor onlink case: %s\n",
2259 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2262 /* validation passed */
2264 icmp6len -= sizeof(*nd_rd);
2265 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2266 if (nd6_options(&ndopts) < 0) {
2267 nd6log((LOG_INFO, "icmp6_redirect_input: "
2268 "invalid ND option, rejected: %s\n",
2269 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2270 /* nd6_options have incremented stats */
2274 if (ndopts.nd_opts_tgt_lladdr) {
2275 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2276 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2280 if (ndopts.nd_opts_rh) {
2281 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2282 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2286 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2288 "icmp6_redirect_input: lladdrlen mismatch for %s "
2289 "(if %d, icmp6 packet %d): %s\n",
2290 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2,
2291 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2296 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2297 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2299 if (!is_onlink) { /* better router case. perform rtredirect. */
2300 /* perform rtredirect */
2301 struct sockaddr_in6 sdst;
2302 struct sockaddr_in6 sgw;
2303 struct sockaddr_in6 ssrc;
2305 bzero(&sdst, sizeof(sdst));
2306 bzero(&sgw, sizeof(sgw));
2307 bzero(&ssrc, sizeof(ssrc));
2308 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2309 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2310 sizeof(struct sockaddr_in6);
2311 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2312 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2313 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2314 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2315 NULL, RTF_GATEWAY | RTF_HOST,
2316 (struct sockaddr *)&ssrc);
2318 /* finally update cached route in each socket via kpfctlinput */
2320 struct sockaddr_in6 sdst;
2322 bzero(&sdst, sizeof(sdst));
2323 sdst.sin6_family = AF_INET6;
2324 sdst.sin6_len = sizeof(struct sockaddr_in6);
2325 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2326 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2328 key_sa_routechange((struct sockaddr *)&sdst);
2337 icmp6stat.icp6s_badredirect++;
2342 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2344 struct ifnet *ifp; /* my outgoing interface */
2345 struct in6_addr *ifp_ll6;
2346 struct in6_addr *router_ll6;
2347 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2348 struct mbuf *m = NULL; /* newly allocated one */
2349 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2350 struct nd_redirect *nd_rd;
2353 struct ifnet *outif = NULL;
2354 struct sockaddr_in6 src_sa;
2356 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2358 /* if we are not router, we don't send icmp6 redirect */
2359 if (!ip6_forwarding || ip6_accept_rtadv)
2363 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2368 * the source address must identify a neighbor, and
2369 * the destination address must not be a multicast address
2370 * [RFC 2461, sec 8.2]
2372 sip6 = mtod(m0, struct ip6_hdr *);
2373 bzero(&src_sa, sizeof(src_sa));
2374 src_sa.sin6_family = AF_INET6;
2375 src_sa.sin6_len = sizeof(src_sa);
2376 src_sa.sin6_addr = sip6->ip6_src;
2377 /* we don't currently use sin6_scope_id, but eventually use it */
2378 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src);
2379 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2381 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2382 goto fail; /* what should we do here? */
2385 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2389 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2390 * we almost always ask for an mbuf cluster for simplicity.
2391 * (MHLEN < IPV6_MMTU is almost always true)
2393 #if IPV6_MMTU >= MCLBYTES
2394 # error assumption failed about IPV6_MMTU and MCLBYTES
2396 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR);
2400 maxlen = M_TRAILINGSPACE(m);
2401 maxlen = min(IPV6_MMTU, maxlen);
2402 /* just for safety */
2403 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2404 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2409 /* get ip6 linklocal address for ifp(my outgoing interface). */
2410 struct in6_ifaddr *ia;
2411 if ((ia = in6ifa_ifpforlinklocal(ifp,
2413 IN6_IFF_ANYCAST)) == NULL)
2415 ifp_ll6 = &ia->ia_addr.sin6_addr;
2418 /* get ip6 linklocal address for the router. */
2419 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2420 struct sockaddr_in6 *sin6;
2421 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2422 router_ll6 = &sin6->sin6_addr;
2423 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2429 ip6 = mtod(m, struct ip6_hdr *);
2431 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2432 ip6->ip6_vfc |= IPV6_VERSION;
2433 /* ip6->ip6_plen will be set later */
2434 ip6->ip6_nxt = IPPROTO_ICMPV6;
2435 ip6->ip6_hlim = 255;
2436 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2437 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2438 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2441 nd_rd = (struct nd_redirect *)(ip6 + 1);
2442 nd_rd->nd_rd_type = ND_REDIRECT;
2443 nd_rd->nd_rd_code = 0;
2444 nd_rd->nd_rd_reserved = 0;
2445 if (rt->rt_flags & RTF_GATEWAY) {
2447 * nd_rd->nd_rd_target must be a link-local address in
2448 * better router cases.
2452 bcopy(router_ll6, &nd_rd->nd_rd_target,
2453 sizeof(nd_rd->nd_rd_target));
2454 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2455 sizeof(nd_rd->nd_rd_dst));
2457 /* make sure redtgt == reddst */
2458 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2459 sizeof(nd_rd->nd_rd_target));
2460 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2461 sizeof(nd_rd->nd_rd_dst));
2464 p = (u_char *)(nd_rd + 1);
2470 /* target lladdr option */
2471 struct rtentry *rt_router = NULL;
2473 struct sockaddr_dl *sdl;
2474 struct nd_opt_hdr *nd_opt;
2477 rt_router = nd6_lookup(router_ll6, 0, ifp);
2480 len = sizeof(*nd_opt) + ifp->if_addrlen;
2481 len = (len + 7) & ~7; /* round by 8 */
2483 if (len + (p - (u_char *)ip6) > maxlen)
2485 if (!(rt_router->rt_flags & RTF_GATEWAY) &&
2486 (rt_router->rt_flags & RTF_LLINFO) &&
2487 (rt_router->rt_gateway->sa_family == AF_LINK) &&
2488 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
2490 nd_opt = (struct nd_opt_hdr *)p;
2491 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2492 nd_opt->nd_opt_len = len >> 3;
2493 lladdr = (char *)(nd_opt + 1);
2494 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
2500 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2502 /* just to be safe */
2503 #ifdef M_DECRYPTED /*not openbsd*/
2504 if (m0->m_flags & M_DECRYPTED)
2507 if (p - (u_char *)ip6 > maxlen)
2511 /* redirected header option */
2513 struct nd_opt_rd_hdr *nd_opt_rh;
2516 * compute the maximum size for icmp6 redirect header option.
2517 * XXX room for auth header?
2519 len = maxlen - (p - (u_char *)ip6);
2522 /* This is just for simplicity. */
2523 if (m0->m_pkthdr.len != m0->m_len) {
2525 m_freem(m0->m_next);
2528 m0->m_pkthdr.len = m0->m_len;
2532 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2533 * about padding/truncate rule for the original IP packet.
2534 * From the discussion on IPv6imp in Feb 1999, the consensus was:
2535 * - "attach as much as possible" is the goal
2536 * - pad if not aligned (original size can be guessed by original
2538 * Following code adds the padding if it is simple enough,
2539 * and truncates if not.
2541 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2542 panic("assumption failed in %s:%d", __FILE__, __LINE__);
2544 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2545 /* not enough room, truncate */
2546 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2548 /* enough room, pad or truncate */
2551 extra = m0->m_pkthdr.len % 8;
2553 /* pad if easy enough, truncate if not */
2554 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2556 m0->m_len += (8 - extra);
2557 m0->m_pkthdr.len += (8 - extra);
2560 m0->m_pkthdr.len -= extra;
2564 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2565 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh);
2568 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2569 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2570 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2571 nd_opt_rh->nd_opt_rh_len = len >> 3;
2572 p += sizeof(*nd_opt_rh);
2573 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2575 /* connect m0 to m */
2577 m->m_pkthdr.len = m->m_len + m0->m_len;
2581 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src))
2582 sip6->ip6_src.s6_addr16[1] = 0;
2583 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst))
2584 sip6->ip6_dst.s6_addr16[1] = 0;
2586 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
2587 ip6->ip6_src.s6_addr16[1] = 0;
2588 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
2589 ip6->ip6_dst.s6_addr16[1] = 0;
2591 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target))
2592 nd_rd->nd_rd_target.s6_addr16[1] = 0;
2593 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst))
2594 nd_rd->nd_rd_dst.s6_addr16[1] = 0;
2596 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2598 nd_rd->nd_rd_cksum = 0;
2600 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen));
2602 /* send the packet to outside... */
2603 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2605 icmp6_ifstat_inc(outif, ifs6_out_msg);
2606 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2608 icmp6stat.icp6s_outhist[ND_REDIRECT]++;
2619 #ifdef HAVE_NRL_INPCB
2620 #define in6pcb inpcb
2621 #define in6p_icmp6filt inp_icmp6filt
2624 * ICMPv6 socket option processing.
2627 icmp6_ctloutput(netmsg_t msg)
2629 struct socket *so = msg->ctloutput.base.nm_so;
2630 struct sockopt *sopt = msg->ctloutput.nm_sopt;
2633 struct inpcb *inp = so->so_pcb;
2634 int level, op, optname;
2637 level = sopt->sopt_level;
2638 op = sopt->sopt_dir;
2639 optname = sopt->sopt_name;
2640 optlen = sopt->sopt_valsize;
2642 level = op = optname = optlen = 0;
2644 if (level != IPPROTO_ICMPV6) {
2654 if (optlen != sizeof(struct icmp6_filter)) {
2658 if (inp->in6p_icmp6filt == NULL) {
2662 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen,
2668 error = ENOPROTOOPT;
2677 if (inp->in6p_icmp6filt == NULL) {
2681 soopt_from_kbuf(sopt, inp->in6p_icmp6filt,
2682 sizeof(struct icmp6_filter));
2687 error = ENOPROTOOPT;
2693 lwkt_replymsg(&msg->ctloutput.base.lmsg, error);
2695 #ifdef HAVE_NRL_INPCB
2697 #undef in6p_icmp6filt
2700 #ifndef HAVE_PPSRATECHECK
2702 #define timersub(tvp, uvp, vvp) \
2704 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
2705 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
2706 if ((vvp)->tv_usec < 0) { \
2708 (vvp)->tv_usec += 1000000; \
2714 * ppsratecheck(): packets (or events) per second limitation.
2717 ppsratecheck(struct timeval *lasttime, int *curpps,
2718 int maxpps) /* maximum pps allowed */
2720 struct timeval tv, delta;
2725 timersub(&tv, lasttime, &delta);
2728 * Check for 0,0 so that the message will be seen at least once.
2729 * If more than one second has passed since the last update of
2730 * lasttime, reset the counter.
2732 * We do increment *curpps even in *curpps < maxpps case, as some may
2733 * try to use *curpps for stat purposes as well.
2735 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
2736 delta.tv_sec >= 1) {
2740 } else if (maxpps < 0)
2742 else if (*curpps < maxpps)
2747 #if 1 /* DIAGNOSTIC? */
2748 /* be careful about wrap-around */
2749 if (*curpps + 1 > *curpps)
2750 *curpps = *curpps + 1;
2753 * assume that there's not too many calls to this function.
2754 * not sure if the assumption holds, as it depends on *caller's*
2755 * behavior, not the behavior of this function.
2756 * IMHO it is wrong to make assumption on the caller's behavior,
2757 * so the above #if is #if 1, not #ifdef DIAGNOSTIC.
2759 *curpps = *curpps + 1;
2767 * Perform rate limit check.
2768 * Returns 0 if it is okay to send the icmp6 packet.
2769 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2772 * XXX per-destination/type check necessary?
2775 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */
2776 const int type, /* not used at this moment */
2777 const int code) /* not used at this moment */
2781 ret = 0; /* okay to send */
2784 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
2786 /* The packet is subject to rate limit */