2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
68 #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */
71 #include "opt_inet6.h"
73 #include <sys/param.h>
74 #include <sys/domain.h>
76 #include <sys/kernel.h>
78 #include <sys/malloc.h>
81 #include <sys/protosw.h>
82 #include <sys/signalvar.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
86 #include <sys/syslog.h>
87 #include <sys/systm.h>
91 #include <net/if_var.h>
92 #include <net/if_dl.h>
93 #include <net/if_llatbl.h>
94 #include <net/if_types.h>
95 #include <net/route.h>
98 #include <netinet/in.h>
99 #include <netinet/in_pcb.h>
100 #include <netinet/in_var.h>
101 #include <netinet/ip6.h>
102 #include <netinet/icmp6.h>
103 #include <netinet/tcp_var.h>
105 #include <netinet6/in6_fib.h>
106 #include <netinet6/in6_ifattach.h>
107 #include <netinet6/in6_pcb.h>
108 #include <netinet6/ip6protosw.h>
109 #include <netinet6/ip6_var.h>
110 #include <netinet6/scope6_var.h>
111 #include <netinet6/mld6_var.h>
112 #include <netinet6/nd6.h>
113 #include <netinet6/send.h>
115 extern struct domain inet6domain;
117 VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
118 VNET_PCPUSTAT_SYSINIT(icmp6stat);
121 VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
124 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
125 VNET_DECLARE(struct inpcbhead, ripcb);
126 VNET_DECLARE(int, icmp6errppslim);
127 VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0;
128 VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last);
129 VNET_DECLARE(int, icmp6_nodeinfo);
131 #define V_ripcbinfo VNET(ripcbinfo)
132 #define V_ripcb VNET(ripcb)
133 #define V_icmp6errppslim VNET(icmp6errppslim)
134 #define V_icmp6errpps_count VNET(icmp6errpps_count)
135 #define V_icmp6errppslim_last VNET(icmp6errppslim_last)
136 #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo)
138 static void icmp6_errcount(int, int);
139 static int icmp6_rip6_input(struct mbuf **, int);
140 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
141 static const char *icmp6_redirect_diag(struct in6_addr *,
142 struct in6_addr *, struct in6_addr *);
143 static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
144 static struct mbuf *ni6_nametodns(const char *, int, int);
145 static int ni6_dnsmatch(const char *, int, const char *, int);
146 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
147 struct ifnet **, struct in6_addr *);
148 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
149 struct ifnet *, int);
150 static int icmp6_notify_error(struct mbuf **, int, int, int);
153 * Kernel module interface for updating icmp6stat. The argument is an index
154 * into icmp6stat treated as an array of u_quad_t. While this encodes the
155 * general layout of icmp6stat into the caller, it doesn't encode its
156 * location, so that future changes to add, for example, per-CPU stats
157 * support won't cause binary compatibility problems for kernel modules.
160 kmod_icmp6stat_inc(int statnum)
163 counter_u64_add(VNET(icmp6stat)[statnum], 1);
167 icmp6_errcount(int type, int code)
170 case ICMP6_DST_UNREACH:
172 case ICMP6_DST_UNREACH_NOROUTE:
173 ICMP6STAT_INC(icp6s_odst_unreach_noroute);
175 case ICMP6_DST_UNREACH_ADMIN:
176 ICMP6STAT_INC(icp6s_odst_unreach_admin);
178 case ICMP6_DST_UNREACH_BEYONDSCOPE:
179 ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
181 case ICMP6_DST_UNREACH_ADDR:
182 ICMP6STAT_INC(icp6s_odst_unreach_addr);
184 case ICMP6_DST_UNREACH_NOPORT:
185 ICMP6STAT_INC(icp6s_odst_unreach_noport);
189 case ICMP6_PACKET_TOO_BIG:
190 ICMP6STAT_INC(icp6s_opacket_too_big);
192 case ICMP6_TIME_EXCEEDED:
194 case ICMP6_TIME_EXCEED_TRANSIT:
195 ICMP6STAT_INC(icp6s_otime_exceed_transit);
197 case ICMP6_TIME_EXCEED_REASSEMBLY:
198 ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
202 case ICMP6_PARAM_PROB:
204 case ICMP6_PARAMPROB_HEADER:
205 ICMP6STAT_INC(icp6s_oparamprob_header);
207 case ICMP6_PARAMPROB_NEXTHEADER:
208 ICMP6STAT_INC(icp6s_oparamprob_nextheader);
210 case ICMP6_PARAMPROB_OPTION:
211 ICMP6STAT_INC(icp6s_oparamprob_option);
216 ICMP6STAT_INC(icp6s_oredirect);
219 ICMP6STAT_INC(icp6s_ounknown);
223 * A wrapper function for icmp6_error() necessary when the erroneous packet
224 * may not contain enough scope zone information.
227 icmp6_error2(struct mbuf *m, int type, int code, int param,
235 #ifndef PULLDOWN_TEST
236 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
238 if (m->m_len < sizeof(struct ip6_hdr)) {
239 m = m_pullup(m, sizeof(struct ip6_hdr));
245 ip6 = mtod(m, struct ip6_hdr *);
247 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
249 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
252 icmp6_error(m, type, code, param);
256 * Generate an error packet of type error in response to bad IP6 packet.
259 icmp6_error(struct mbuf *m, int type, int code, int param)
261 struct ip6_hdr *oip6, *nip6;
262 struct icmp6_hdr *icmp6;
267 ICMP6STAT_INC(icp6s_error);
269 /* count per-type-code statistics */
270 icmp6_errcount(type, code);
272 #ifdef M_DECRYPTED /*not openbsd*/
273 if (m->m_flags & M_DECRYPTED) {
274 ICMP6STAT_INC(icp6s_canterror);
279 #ifndef PULLDOWN_TEST
280 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
282 if (m->m_len < sizeof(struct ip6_hdr)) {
283 m = m_pullup(m, sizeof(struct ip6_hdr));
288 oip6 = mtod(m, struct ip6_hdr *);
291 * If the destination address of the erroneous packet is a multicast
292 * address, or the packet was sent using link-layer multicast,
293 * we should basically suppress sending an error (RFC 2463, Section
295 * We have two exceptions (the item e.2 in that section):
296 * - the Packet Too Big message can be sent for path MTU discovery.
297 * - the Parameter Problem Message that can be allowed an icmp6 error
298 * in the option type field. This check has been done in
299 * ip6_unknown_opt(), so we can just check the type and code.
301 if ((m->m_flags & (M_BCAST|M_MCAST) ||
302 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
303 (type != ICMP6_PACKET_TOO_BIG &&
304 (type != ICMP6_PARAM_PROB ||
305 code != ICMP6_PARAMPROB_OPTION)))
309 * RFC 2463, 2.4 (e.5): source address check.
310 * XXX: the case of anycast source?
312 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
313 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
317 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
321 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
322 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
323 struct icmp6_hdr *icp;
325 #ifndef PULLDOWN_TEST
326 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
327 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
329 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
332 ICMP6STAT_INC(icp6s_tooshort);
336 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
337 icp->icmp6_type == ND_REDIRECT) {
340 * Special case: for redirect (which is
341 * informational) we must not send icmp6 error.
343 ICMP6STAT_INC(icp6s_canterror);
346 /* ICMPv6 informational - send the error */
349 /* non-ICMPv6 - send the error */
352 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
354 /* Finally, do rate limitation check. */
355 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
356 ICMP6STAT_INC(icp6s_toofreq);
361 * OK, ICMP6 can be generated.
364 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
365 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
367 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
368 M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */
370 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
374 nip6 = mtod(m, struct ip6_hdr *);
375 nip6->ip6_src = oip6->ip6_src;
376 nip6->ip6_dst = oip6->ip6_dst;
378 in6_clearscope(&oip6->ip6_src);
379 in6_clearscope(&oip6->ip6_dst);
381 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
382 icmp6->icmp6_type = type;
383 icmp6->icmp6_code = code;
384 icmp6->icmp6_pptr = htonl((u_int32_t)param);
386 ICMP6STAT_INC(icp6s_outhist[type]);
387 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
393 * If we can't tell whether or not we can generate ICMP6, free it.
399 * Process a received ICMP6 message.
402 icmp6_input(struct mbuf **mp, int *offp, int proto)
404 struct mbuf *m = *mp, *n;
406 struct ip6_hdr *ip6, *nip6;
407 struct icmp6_hdr *icmp6, *nicmp6;
409 int icmp6len = m->m_pkthdr.len - *offp;
411 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
414 ifp = m->m_pkthdr.rcvif;
416 #ifndef PULLDOWN_TEST
417 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
418 /* m might change if M_LOOP. So, call mtod after this */
422 * Locate icmp6 structure in mbuf, and check
423 * that not corrupted and of at least minimum length
426 ip6 = mtod(m, struct ip6_hdr *);
427 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
428 if (icmp6len < sizeof(struct icmp6_hdr)) {
429 ICMP6STAT_INC(icp6s_tooshort);
434 * Check multicast group membership.
435 * Note: SSM filters are not applied for ICMPv6 traffic.
437 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
438 struct in6_multi *inm;
440 inm = in6m_lookup(ifp, &ip6->ip6_dst);
442 IP6STAT_INC(ip6s_notmember);
443 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
449 * calculate the checksum
451 #ifndef PULLDOWN_TEST
452 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
454 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
456 ICMP6STAT_INC(icp6s_tooshort);
460 code = icmp6->icmp6_code;
462 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
464 "ICMP6 checksum error(%d|%x) %s\n",
465 icmp6->icmp6_type, sum,
466 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
467 ICMP6STAT_INC(icp6s_checksum);
471 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
472 icmp6_ifstat_inc(ifp, ifs6_in_msg);
473 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
474 icmp6_ifstat_inc(ifp, ifs6_in_error);
476 switch (icmp6->icmp6_type) {
477 case ICMP6_DST_UNREACH:
478 icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
480 case ICMP6_DST_UNREACH_NOROUTE:
481 case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */
482 code = PRC_UNREACH_NET;
484 case ICMP6_DST_UNREACH_ADMIN:
485 icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
486 code = PRC_UNREACH_ADMIN_PROHIB;
488 case ICMP6_DST_UNREACH_BEYONDSCOPE:
489 /* I mean "source address was incorrect." */
490 code = PRC_PARAMPROB;
492 case ICMP6_DST_UNREACH_NOPORT:
493 code = PRC_UNREACH_PORT;
501 case ICMP6_PACKET_TOO_BIG:
502 icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
504 /* validation is made in icmp6_mtudisc_update */
509 * Updating the path MTU will be done after examining
510 * intermediate extension headers.
515 case ICMP6_TIME_EXCEEDED:
516 icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
518 case ICMP6_TIME_EXCEED_TRANSIT:
519 code = PRC_TIMXCEED_INTRANS;
521 case ICMP6_TIME_EXCEED_REASSEMBLY:
522 code = PRC_TIMXCEED_REASS;
530 case ICMP6_PARAM_PROB:
531 icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
533 case ICMP6_PARAMPROB_NEXTHEADER:
534 code = PRC_UNREACH_PROTOCOL;
536 case ICMP6_PARAMPROB_HEADER:
537 case ICMP6_PARAMPROB_OPTION:
538 code = PRC_PARAMPROB;
546 case ICMP6_ECHO_REQUEST:
547 icmp6_ifstat_inc(ifp, ifs6_in_echo);
550 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
555 || n->m_len < off + sizeof(struct icmp6_hdr)) {
559 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
560 n = m_gethdr(M_NOWAIT, n0->m_type);
567 m_move_pkthdr(n, n0); /* FIB copied. */
568 n0len = n0->m_pkthdr.len; /* save for use below */
570 * Copy IPv6 and ICMPv6 only.
572 nip6 = mtod(n, struct ip6_hdr *);
573 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
574 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
575 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
576 noff = sizeof(struct ip6_hdr);
577 /* new mbuf contains only ipv6+icmpv6 headers */
578 n->m_len = noff + sizeof(struct icmp6_hdr);
580 * Adjust mbuf. ip6_plen will be adjusted in
583 m_adj(n0, off + sizeof(struct icmp6_hdr));
584 /* recalculate complete packet size */
585 n->m_pkthdr.len = n0len + (noff - off);
588 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
593 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
594 nicmp6->icmp6_code = 0;
595 ICMP6STAT_INC(icp6s_reflect);
596 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
597 icmp6_reflect(n, noff);
601 case ICMP6_ECHO_REPLY:
602 icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
607 case MLD_LISTENER_QUERY:
608 case MLD_LISTENER_REPORT:
609 case MLD_LISTENER_DONE:
610 case MLDV2_LISTENER_REPORT:
612 * Drop MLD traffic which is not link-local, has a hop limit
613 * of greater than 1 hop, or which does not have the
614 * IPv6 HBH Router Alert option.
615 * As IPv6 HBH options are stripped in ip6_input() we must
616 * check an mbuf header flag.
617 * XXX Should we also sanity check that these messages
618 * were directed to a link-local multicast prefix?
620 if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
622 if (mld_input(m, off, icmp6len) != 0)
623 return (IPPROTO_DONE);
627 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
629 enum { WRU, FQDN } mode;
632 if (!V_icmp6_nodeinfo)
635 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
637 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
643 sx_slock(&allprison_lock);
644 TAILQ_FOREACH(pr, &allprison, pr_list)
645 if (pr->pr_vnet == ifp->if_vnet)
647 sx_sunlock(&allprison_lock);
649 pr = curthread->td_ucred->cr_prison;
651 #ifndef PULLDOWN_TEST
652 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
655 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
657 n = ni6_input(n, off, pr);
658 /* XXX meaningless if n == NULL */
659 noff = sizeof(struct ip6_hdr);
665 * XXX: this combination of flags is pointless,
666 * but should we keep this for compatibility?
668 if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
669 ICMP6_NODEINFO_TMPADDROK)) !=
670 (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
676 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
677 n = m_gethdr(M_NOWAIT, m->m_type);
682 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
684 * Previous code did a blind M_COPY_PKTHDR
685 * and said "just for rcvif". If true, then
686 * we could tolerate the dup failing (due to
687 * the deep copy of the tag chain). For now
688 * be conservative and just fail.
695 * Copy IPv6 and ICMPv6 only.
697 nip6 = mtod(n, struct ip6_hdr *);
698 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
699 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
700 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
701 p = (u_char *)(nicmp6 + 1);
704 maxhlen = M_TRAILINGSPACE(n) -
705 (sizeof(*nip6) + sizeof(*nicmp6) + 4);
706 mtx_lock(&pr->pr_mtx);
707 hlen = strlen(pr->pr_hostname);
710 /* meaningless TTL */
711 bcopy(pr->pr_hostname, p + 4, maxhlen);
712 mtx_unlock(&pr->pr_mtx);
713 noff = sizeof(struct ip6_hdr);
714 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
715 sizeof(struct icmp6_hdr) + 4 + maxhlen;
716 nicmp6->icmp6_type = ICMP6_WRUREPLY;
717 nicmp6->icmp6_code = 0;
720 ICMP6STAT_INC(icp6s_reflect);
721 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
722 icmp6_reflect(n, noff);
732 case ND_ROUTER_SOLICIT:
733 icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
736 if (icmp6len < sizeof(struct nd_router_solicit))
738 if (send_sendso_input_hook != NULL) {
739 IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE);
740 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
746 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
747 nd6_rs_input(m, off, icmp6len);
753 case ND_ROUTER_ADVERT:
754 icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
757 if (icmp6len < sizeof(struct nd_router_advert))
759 if (send_sendso_input_hook != NULL) {
760 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
766 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
767 nd6_ra_input(m, off, icmp6len);
773 case ND_NEIGHBOR_SOLICIT:
774 icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
777 if (icmp6len < sizeof(struct nd_neighbor_solicit))
779 if (send_sendso_input_hook != NULL) {
780 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
786 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
787 nd6_ns_input(m, off, icmp6len);
793 case ND_NEIGHBOR_ADVERT:
794 icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
797 if (icmp6len < sizeof(struct nd_neighbor_advert))
799 if (send_sendso_input_hook != NULL) {
800 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
806 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
807 nd6_na_input(m, off, icmp6len);
814 icmp6_ifstat_inc(ifp, ifs6_in_redirect);
817 if (icmp6len < sizeof(struct nd_redirect))
819 if (send_sendso_input_hook != NULL) {
820 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
826 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
827 icmp6_redirect_input(m, off);
833 case ICMP6_ROUTER_RENUMBERING:
834 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
835 code != ICMP6_ROUTER_RENUMBERING_RESULT)
837 if (icmp6len < sizeof(struct icmp6_router_renum))
843 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
844 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
845 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
846 ifp ? ifp->if_index : 0));
847 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
848 /* ICMPv6 error: MUST deliver it by spec... */
852 /* ICMPv6 informational: MUST not deliver */
856 if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
857 /* In this case, m should've been freed. */
858 return (IPPROTO_DONE);
863 ICMP6STAT_INC(icp6s_badcode);
867 ICMP6STAT_INC(icp6s_badlen);
871 /* deliver the packet to appropriate sockets */
872 icmp6_rip6_input(&m, *offp);
882 icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
884 struct mbuf *m = *mp;
885 struct icmp6_hdr *icmp6;
886 struct ip6_hdr *eip6;
888 struct sockaddr_in6 icmp6src, icmp6dst;
890 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
891 ICMP6STAT_INC(icp6s_tooshort);
894 #ifndef PULLDOWN_TEST
895 IP6_EXTHDR_CHECK(m, off,
896 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
897 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
899 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
900 sizeof(*icmp6) + sizeof(struct ip6_hdr));
902 ICMP6STAT_INC(icp6s_tooshort);
906 eip6 = (struct ip6_hdr *)(icmp6 + 1);
908 /* Detect the upper level protocol */
910 void (*ctlfunc)(int, struct sockaddr *, void *);
911 u_int8_t nxt = eip6->ip6_nxt;
912 int eoff = off + sizeof(struct icmp6_hdr) +
913 sizeof(struct ip6_hdr);
914 struct ip6ctlparam ip6cp;
915 struct in6_addr *finaldst = NULL;
916 int icmp6type = icmp6->icmp6_type;
918 struct ip6_rthdr *rth;
919 struct ip6_rthdr0 *rth0;
922 while (1) { /* XXX: should avoid infinite loop explicitly? */
926 case IPPROTO_HOPOPTS:
927 case IPPROTO_DSTOPTS:
929 #ifndef PULLDOWN_TEST
930 IP6_EXTHDR_CHECK(m, 0,
931 eoff + sizeof(struct ip6_ext), -1);
932 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
934 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
937 ICMP6STAT_INC(icp6s_tooshort);
942 if (nxt == IPPROTO_AH)
943 eoff += (eh->ip6e_len + 2) << 2;
945 eoff += (eh->ip6e_len + 1) << 3;
948 case IPPROTO_ROUTING:
950 * When the erroneous packet contains a
951 * routing header, we should examine the
952 * header to determine the final destination.
953 * Otherwise, we can't properly update
954 * information that depends on the final
955 * destination (e.g. path MTU).
957 #ifndef PULLDOWN_TEST
958 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
959 rth = (struct ip6_rthdr *)
960 (mtod(m, caddr_t) + eoff);
962 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
965 ICMP6STAT_INC(icp6s_tooshort);
969 rthlen = (rth->ip6r_len + 1) << 3;
971 * XXX: currently there is no
972 * officially defined type other
974 * Note that if the segment left field
975 * is 0, all intermediate hops must
978 if (rth->ip6r_segleft &&
979 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
982 #ifndef PULLDOWN_TEST
983 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
984 rth0 = (struct ip6_rthdr0 *)
985 (mtod(m, caddr_t) + eoff);
988 struct ip6_rthdr0 *, m,
991 ICMP6STAT_INC(icp6s_tooshort);
995 /* just ignore a bogus header */
996 if ((rth0->ip6r0_len % 2) == 0 &&
997 (hops = rth0->ip6r0_len/2))
998 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1001 nxt = rth->ip6r_nxt;
1003 case IPPROTO_FRAGMENT:
1004 #ifndef PULLDOWN_TEST
1005 IP6_EXTHDR_CHECK(m, 0, eoff +
1006 sizeof(struct ip6_frag), -1);
1007 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1010 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1013 ICMP6STAT_INC(icp6s_tooshort);
1018 * Data after a fragment header is meaningless
1019 * unless it is the first fragment, but
1020 * we'll go to the notify label for path MTU
1023 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1026 eoff += sizeof(struct ip6_frag);
1031 * This case includes ESP and the No Next
1032 * Header. In such cases going to the notify
1033 * label does not have any meaning
1034 * (i.e. ctlfunc will be NULL), but we go
1035 * anyway since we might have to update
1036 * path MTU information.
1042 #ifndef PULLDOWN_TEST
1043 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1045 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1046 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1047 if (icmp6 == NULL) {
1048 ICMP6STAT_INC(icp6s_tooshort);
1054 * retrieve parameters from the inner IPv6 header, and convert
1055 * them into sockaddr structures.
1056 * XXX: there is no guarantee that the source or destination
1057 * addresses of the inner packet are in the same scope as
1058 * the addresses of the icmp packet. But there is no other
1059 * way to determine the zone.
1061 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1063 bzero(&icmp6dst, sizeof(icmp6dst));
1064 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1065 icmp6dst.sin6_family = AF_INET6;
1066 if (finaldst == NULL)
1067 icmp6dst.sin6_addr = eip6->ip6_dst;
1069 icmp6dst.sin6_addr = *finaldst;
1070 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1072 bzero(&icmp6src, sizeof(icmp6src));
1073 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1074 icmp6src.sin6_family = AF_INET6;
1075 icmp6src.sin6_addr = eip6->ip6_src;
1076 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1078 icmp6src.sin6_flowinfo =
1079 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1081 if (finaldst == NULL)
1082 finaldst = &eip6->ip6_dst;
1084 ip6cp.ip6c_icmp6 = icmp6;
1085 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1086 ip6cp.ip6c_off = eoff;
1087 ip6cp.ip6c_finaldst = finaldst;
1088 ip6cp.ip6c_src = &icmp6src;
1089 ip6cp.ip6c_nxt = nxt;
1091 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1092 notifymtu = ntohl(icmp6->icmp6_mtu);
1093 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1094 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1097 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1098 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1100 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1113 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1115 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1116 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1117 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1118 u_int mtu = ntohl(icmp6->icmp6_mtu);
1119 struct in_conninfo inc;
1123 * RFC2460 section 5, last paragraph.
1124 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1125 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1126 * due to packet translator in the middle.
1127 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1130 if (mtu < IPV6_MMTU)
1135 * we reject ICMPv6 too big with abnormally small value.
1136 * XXX what is the good definition of "abnormally small"?
1138 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1145 * In case the suggested mtu is less than IPV6_MMTU, we
1146 * only need to remember that it was for above mentioned
1147 * "alwaysfrag" case.
1148 * Try to be as close to the spec as possible.
1150 if (mtu < IPV6_MMTU)
1151 mtu = IPV6_MMTU - 8;
1153 bzero(&inc, sizeof(inc));
1154 inc.inc_fibnum = M_GETFIB(m);
1155 inc.inc_flags |= INC_ISIPV6;
1156 inc.inc6_faddr = *dst;
1157 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1160 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1161 tcp_hc_updatemtu(&inc, mtu);
1162 ICMP6STAT_INC(icp6s_pmtuchg);
1167 * Process a Node Information Query packet, based on
1168 * draft-ietf-ipngwg-icmp-name-lookups-07.
1170 * Spec incompatibilities:
1171 * - IPv6 Subject address handling
1172 * - IPv4 Subject address handling support missing
1173 * - Proxy reply (answer even if it's not for me)
1174 * - joins NI group address at in6_ifattach() time only, does not cope
1175 * with hostname changes by sethostname(3)
1177 static struct mbuf *
1178 ni6_input(struct mbuf *m, int off, struct prison *pr)
1180 struct icmp6_nodeinfo *ni6, *nni6;
1181 struct mbuf *n = NULL;
1184 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1185 struct ni_reply_fqdn *fqdn;
1186 int addrs; /* for NI_QTYPE_NODEADDR */
1187 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1188 struct in6_addr in6_subj; /* subject address */
1189 struct ip6_hdr *ip6;
1190 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1192 struct in6_ifaddr *ia6 = NULL;
1194 ip6 = mtod(m, struct ip6_hdr *);
1195 #ifndef PULLDOWN_TEST
1196 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1198 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1200 /* m is already reclaimed */
1206 * Validate IPv6 source address.
1207 * The default configuration MUST be to refuse answering queries from
1208 * global-scope addresses according to RFC4602.
1210 * - it's not very clear what "refuse" means; this implementation
1212 * - it's not very easy to identify global-scope (unicast) addresses
1213 * since there are many prefixes for them. It should be safer
1214 * and in practice sufficient to check "all" but loopback and
1215 * link-local (note that site-local unicast was deprecated and
1216 * ULA is defined as global scope-wise)
1218 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1219 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1220 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1224 * Validate IPv6 destination address.
1226 * The Responder must discard the Query without further processing
1227 * unless it is one of the Responder's unicast or anycast addresses, or
1228 * a link-local scope multicast address which the Responder has joined.
1229 * [RFC4602, Section 5.]
1231 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1232 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1234 /* else it's a link-local multicast, fine */
1235 } else { /* unicast or anycast */
1236 ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
1238 goto bad; /* XXX impossible */
1240 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1241 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1242 ifa_free(&ia6->ia_ifa);
1243 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1244 "a temporary address in %s:%d",
1245 __FILE__, __LINE__));
1248 ifa_free(&ia6->ia_ifa);
1251 /* validate query Subject field. */
1252 qtype = ntohs(ni6->ni_qtype);
1253 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1256 case NI_QTYPE_SUPTYPES:
1258 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1262 case NI_QTYPE_NODEADDR:
1263 case NI_QTYPE_IPV4ADDR:
1264 switch (ni6->ni_code) {
1265 case ICMP6_NI_SUBJ_IPV6:
1266 #if ICMP6_NI_SUBJ_IPV6 != 0
1270 * backward compatibility - try to accept 03 draft
1271 * format, where no Subject is present.
1273 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1278 #if ICMP6_NI_SUBJ_IPV6 != 0
1279 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1283 if (subjlen != sizeof(struct in6_addr))
1287 * Validate Subject address.
1289 * Not sure what exactly "address belongs to the node"
1290 * means in the spec, is it just unicast, or what?
1292 * At this moment we consider Subject address as
1293 * "belong to the node" if the Subject address equals
1294 * to the IPv6 destination address; validation for
1295 * IPv6 destination address should have done enough
1298 * We do not do proxy at this moment.
1300 /* m_pulldown instead of copy? */
1301 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1302 subjlen, (caddr_t)&in6_subj);
1303 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1306 subj = (char *)&in6_subj;
1307 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1311 * XXX if we are to allow other cases, we should really
1312 * be careful about scope here.
1313 * basically, we should disallow queries toward IPv6
1314 * destination X with subject Y,
1315 * if scope(X) > scope(Y).
1316 * if we allow scope(X) > scope(Y), it will result in
1317 * information leakage across scope boundary.
1321 case ICMP6_NI_SUBJ_FQDN:
1323 * Validate Subject name with gethostname(3).
1325 * The behavior may need some debate, since:
1326 * - we are not sure if the node has FQDN as
1327 * hostname (returned by gethostname(3)).
1328 * - the code does wildcard match for truncated names.
1329 * however, we are not sure if we want to perform
1330 * wildcard match, if gethostname(3) side has
1331 * truncated hostname.
1333 mtx_lock(&pr->pr_mtx);
1334 n = ni6_nametodns(pr->pr_hostname,
1335 strlen(pr->pr_hostname), 0);
1336 mtx_unlock(&pr->pr_mtx);
1337 if (!n || n->m_next || n->m_len == 0)
1339 IP6_EXTHDR_GET(subj, char *, m,
1340 off + sizeof(struct icmp6_nodeinfo), subjlen);
1343 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1351 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1358 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1361 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1364 case NI_QTYPE_NODEADDR:
1365 case NI_QTYPE_IPV4ADDR:
1366 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1371 /* guess reply length */
1374 break; /* no reply data */
1375 case NI_QTYPE_SUPTYPES:
1376 replylen += sizeof(u_int32_t);
1379 /* XXX will append an mbuf */
1380 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1382 case NI_QTYPE_NODEADDR:
1383 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1384 if ((replylen += addrs * (sizeof(struct in6_addr) +
1385 sizeof(u_int32_t))) > MCLBYTES)
1386 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1388 case NI_QTYPE_IPV4ADDR:
1389 /* unsupported - should respond with unknown Qtype? */
1393 * XXX: We must return a reply with the ICMP6 code
1394 * `unknown Qtype' in this case. However we regard the case
1395 * as an FQDN query for backward compatibility.
1396 * Older versions set a random value to this field,
1397 * so it rarely varies in the defined qtypes.
1398 * But the mechanism is not reliable...
1399 * maybe we should obsolete older versions.
1401 qtype = NI_QTYPE_FQDN;
1402 /* XXX will append an mbuf */
1403 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1408 /* Allocate an mbuf to reply. */
1409 if (replylen > MCLBYTES) {
1411 * XXX: should we try to allocate more? But MCLBYTES
1412 * is probably much larger than IPV6_MMTU...
1416 if (replylen > MHLEN)
1417 n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
1419 n = m_gethdr(M_NOWAIT, m->m_type);
1424 m_move_pkthdr(n, m); /* just for recvif and FIB */
1425 n->m_pkthdr.len = n->m_len = replylen;
1427 /* copy mbuf header and IPv6 + Node Information base headers */
1428 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1429 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1430 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1432 /* qtype dependent procedure */
1435 nni6->ni_code = ICMP6_NI_SUCCESS;
1438 case NI_QTYPE_SUPTYPES:
1441 nni6->ni_code = ICMP6_NI_SUCCESS;
1442 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1443 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1444 v = (u_int32_t)htonl(0x0000000f);
1445 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1449 nni6->ni_code = ICMP6_NI_SUCCESS;
1450 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1451 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1452 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1453 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1455 * XXX do we really have FQDN in hostname?
1457 mtx_lock(&pr->pr_mtx);
1458 n->m_next = ni6_nametodns(pr->pr_hostname,
1459 strlen(pr->pr_hostname), oldfqdn);
1460 mtx_unlock(&pr->pr_mtx);
1461 if (n->m_next == NULL)
1463 /* XXX we assume that n->m_next is not a chain */
1464 if (n->m_next->m_next != NULL)
1466 n->m_pkthdr.len += n->m_next->m_len;
1468 case NI_QTYPE_NODEADDR:
1472 nni6->ni_code = ICMP6_NI_SUCCESS;
1473 n->m_pkthdr.len = n->m_len =
1474 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1475 lenlim = M_TRAILINGSPACE(n);
1476 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1477 /* XXX: reset mbuf length */
1478 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1479 sizeof(struct icmp6_nodeinfo) + copied;
1483 break; /* XXX impossible! */
1486 nni6->ni_type = ICMP6_NI_REPLY;
1498 * make a mbuf with DNS-encoded string. no compression support.
1500 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1501 * treated as truncated name (two \0 at the end). this is a wild guess.
1503 * old - return pascal string if non-zero
1505 static struct mbuf *
1506 ni6_nametodns(const char *name, int namelen, int old)
1518 /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
1520 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1522 m = m_get(M_NOWAIT, MT_DATA);
1528 *mtod(m, char *) = namelen;
1529 bcopy(name, mtod(m, char *) + 1, namelen);
1533 cp = mtod(m, char *);
1534 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1536 /* if not certain about my name, return empty buffer */
1541 * guess if it looks like shortened hostname, or FQDN.
1542 * shortened hostname needs two trailing "\0".
1545 for (p = name; p < name + namelen; p++) {
1546 if (*p && *p == '.')
1555 while (cp < ep && p < name + namelen) {
1557 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1559 /* result does not fit into mbuf */
1560 if (cp + i + 1 >= ep)
1563 * DNS label length restriction, RFC1035 page 8.
1564 * "i == 0" case is included here to avoid returning
1565 * 0-length label on "foo..bar".
1567 if (i <= 0 || i >= 64)
1573 if (p < name + namelen && *p == '.')
1577 if (cp + nterm >= ep)
1581 m->m_len = cp - mtod(m, char *);
1585 panic("should not reach here");
1595 * check if two DNS-encoded string matches. takes care of truncated
1596 * form (with \0\0 at the end). no compression support.
1597 * XXX upper/lowercase match (see RFC2065)
1600 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1602 const char *a0, *b0;
1605 /* simplest case - need validation? */
1606 if (alen == blen && bcmp(a, b, alen) == 0)
1612 /* termination is mandatory */
1613 if (alen < 2 || blen < 2)
1615 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1620 while (a - a0 < alen && b - b0 < blen) {
1621 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1624 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1626 /* we don't support compression yet */
1627 if (a[0] >= 64 || b[0] >= 64)
1630 /* truncated case */
1631 if (a[0] == 0 && a - a0 == alen - 1)
1633 if (b[0] == 0 && b - b0 == blen - 1)
1635 if (a[0] == 0 || b[0] == 0)
1641 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1643 if (bcmp(a + 1, b + 1, l) != 0)
1650 if (a - a0 == alen && b - b0 == blen)
1657 * calculate the number of addresses to be returned in the node info reply.
1660 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1661 struct in6_addr *subj)
1663 struct epoch_tracker et;
1665 struct in6_ifaddr *ifa6;
1667 int addrs = 0, addrsofif, iffound = 0;
1668 int niflags = ni6->ni_flags;
1670 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1671 switch (ni6->ni_code) {
1672 case ICMP6_NI_SUBJ_IPV6:
1673 if (subj == NULL) /* must be impossible... */
1678 * XXX: we only support IPv6 subject address for
1685 NET_EPOCH_ENTER(et);
1686 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1688 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1689 if (ifa->ifa_addr->sa_family != AF_INET6)
1691 ifa6 = (struct in6_ifaddr *)ifa;
1693 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1694 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1698 * IPv4-mapped addresses can only be returned by a
1699 * Node Information proxy, since they represent
1700 * addresses of IPv4-only nodes, which perforce do
1701 * not implement this protocol.
1702 * [icmp-name-lookups-07, Section 5.4]
1703 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1704 * this function at this moment.
1707 /* What do we have to do about ::1? */
1708 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1709 case IPV6_ADDR_SCOPE_LINKLOCAL:
1710 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1713 case IPV6_ADDR_SCOPE_SITELOCAL:
1714 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1717 case IPV6_ADDR_SCOPE_GLOBAL:
1718 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1726 * check if anycast is okay.
1727 * XXX: just experimental. not in the spec.
1729 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1730 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1731 continue; /* we need only unicast addresses */
1732 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1733 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1736 addrsofif++; /* count the address */
1752 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1753 struct ifnet *ifp0, int resid)
1755 struct epoch_tracker et;
1757 struct in6_ifaddr *ifa6;
1759 struct ifnet *ifp_dep = NULL;
1760 int copied = 0, allow_deprecated = 0;
1761 u_char *cp = (u_char *)(nni6 + 1);
1762 int niflags = ni6->ni_flags;
1765 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1766 return (0); /* needless to copy */
1768 NET_EPOCH_ENTER(et);
1769 ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet);
1772 for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) {
1773 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1774 if (ifa->ifa_addr->sa_family != AF_INET6)
1776 ifa6 = (struct in6_ifaddr *)ifa;
1778 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1779 allow_deprecated == 0) {
1781 * prefererred address should be put before
1782 * deprecated addresses.
1785 /* record the interface for later search */
1786 if (ifp_dep == NULL)
1790 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1791 allow_deprecated != 0)
1792 continue; /* we now collect deprecated addrs */
1794 /* What do we have to do about ::1? */
1795 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1796 case IPV6_ADDR_SCOPE_LINKLOCAL:
1797 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1800 case IPV6_ADDR_SCOPE_SITELOCAL:
1801 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1804 case IPV6_ADDR_SCOPE_GLOBAL:
1805 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1813 * check if anycast is okay.
1814 * XXX: just experimental. not in the spec.
1816 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1817 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1819 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1820 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1824 /* now we can copy the address */
1825 if (resid < sizeof(struct in6_addr) +
1826 sizeof(u_int32_t)) {
1828 * We give up much more copy.
1829 * Set the truncate flag and return.
1831 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1837 * Set the TTL of the address.
1838 * The TTL value should be one of the following
1839 * according to the specification:
1841 * 1. The remaining lifetime of a DHCP lease on the
1843 * 2. The remaining Valid Lifetime of a prefix from
1844 * which the address was derived through Stateless
1845 * Autoconfiguration.
1847 * Note that we currently do not support stateful
1848 * address configuration by DHCPv6, so the former
1849 * case can't happen.
1851 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1852 ltime = ND6_INFINITE_LIFETIME;
1854 if (ifa6->ia6_lifetime.ia6t_expire >
1856 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1861 bcopy(<ime, cp, sizeof(u_int32_t));
1862 cp += sizeof(u_int32_t);
1864 /* copy the address itself */
1865 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1866 sizeof(struct in6_addr));
1867 in6_clearscope((struct in6_addr *)cp); /* XXX */
1868 cp += sizeof(struct in6_addr);
1870 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1871 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1873 if (ifp0) /* we need search only on the specified IF */
1877 if (allow_deprecated == 0 && ifp_dep != NULL) {
1879 allow_deprecated = 1;
1890 * XXX almost dup'ed code with rip6_input.
1893 icmp6_rip6_input(struct mbuf **mp, int off)
1895 struct mbuf *m = *mp;
1896 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1898 struct inpcb *last = NULL;
1899 struct sockaddr_in6 fromsa;
1900 struct icmp6_hdr *icmp6;
1901 struct epoch_tracker et;
1902 struct mbuf *opts = NULL;
1904 #ifndef PULLDOWN_TEST
1905 /* this is assumed to be safe. */
1906 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1908 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1909 if (icmp6 == NULL) {
1910 /* m is already reclaimed */
1911 return (IPPROTO_DONE);
1916 * XXX: the address may have embedded scope zone ID, which should be
1917 * hidden from applications.
1919 bzero(&fromsa, sizeof(fromsa));
1920 fromsa.sin6_family = AF_INET6;
1921 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1922 fromsa.sin6_addr = ip6->ip6_src;
1923 if (sa6_recoverscope(&fromsa)) {
1925 return (IPPROTO_DONE);
1928 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
1929 CK_LIST_FOREACH(inp, &V_ripcb, inp_list) {
1930 if ((inp->inp_vflag & INP_IPV6) == 0)
1932 if (inp->inp_ip_p != IPPROTO_ICMPV6)
1934 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1935 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
1937 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1938 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
1941 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1945 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1946 inp->in6p_icmp6filt)) {
1951 struct mbuf *n = NULL;
1954 * Recent network drivers tend to allocate a single
1955 * mbuf cluster, rather than to make a couple of
1956 * mbufs without clusters. Also, since the IPv6 code
1957 * path tries to avoid m_pullup(), it is highly
1958 * probable that we still have an mbuf cluster here
1959 * even though the necessary length can be stored in an
1960 * mbuf's internal buffer.
1961 * Meanwhile, the default size of the receive socket
1962 * buffer for raw sockets is not so large. This means
1963 * the possibility of packet loss is relatively higher
1964 * than before. To avoid this scenario, we copy the
1965 * received data to a separate mbuf that does not use
1966 * a cluster, if possible.
1967 * XXX: it is better to copy the data after stripping
1968 * intermediate headers.
1970 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1971 m->m_len <= MHLEN) {
1972 n = m_get(M_NOWAIT, m->m_type);
1974 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1975 bcopy(m->m_data, n->m_data,
1977 n->m_len = m->m_len;
1985 (n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
1986 if (last->inp_flags & INP_CONTROLOPTS)
1987 ip6_savecontrol(last, n, &opts);
1988 /* strip intermediate headers */
1990 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
1991 if (sbappendaddr_locked(
1992 &last->inp_socket->so_rcv,
1993 (struct sockaddr *)&fromsa, n, opts)
1995 /* should notify about lost packet */
2001 &last->inp_socket->so_rcv);
2003 sorwakeup_locked(last->inp_socket);
2010 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
2012 if (last->inp_flags & INP_CONTROLOPTS)
2013 ip6_savecontrol(last, m, &opts);
2014 /* strip intermediate headers */
2017 /* avoid using mbuf clusters if possible (see above) */
2018 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2019 m->m_len <= MHLEN) {
2022 n = m_get(M_NOWAIT, m->m_type);
2024 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2025 bcopy(m->m_data, n->m_data, m->m_len);
2026 n->m_len = m->m_len;
2036 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2037 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
2038 (struct sockaddr *)&fromsa, m, opts) == 0) {
2042 SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
2044 sorwakeup_locked(last->inp_socket);
2048 IP6STAT_DEC(ip6s_delivered);
2050 return IPPROTO_DONE;
2054 * Reflect the ip6 packet back to the source.
2055 * OFF points to the icmp6 header, counted from the top of the mbuf.
2058 icmp6_reflect(struct mbuf *m, size_t off)
2060 struct in6_addr src6, *srcp;
2061 struct ip6_hdr *ip6;
2062 struct icmp6_hdr *icmp6;
2063 struct in6_ifaddr *ia = NULL;
2064 struct ifnet *outif = NULL;
2066 int type, code, hlim;
2068 /* too short to reflect */
2069 if (off < sizeof(struct ip6_hdr)) {
2071 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2072 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2073 __FILE__, __LINE__));
2078 * If there are extra headers between IPv6 and ICMPv6, strip
2079 * off that header first.
2082 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2083 panic("assumption failed in icmp6_reflect");
2085 if (off > sizeof(struct ip6_hdr)) {
2087 struct ip6_hdr nip6;
2089 l = off - sizeof(struct ip6_hdr);
2090 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2092 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2094 if ((m = m_pullup(m, l)) == NULL)
2097 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2098 } else /* off == sizeof(struct ip6_hdr) */ {
2100 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2102 if ((m = m_pullup(m, l)) == NULL)
2106 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2107 ip6 = mtod(m, struct ip6_hdr *);
2108 ip6->ip6_nxt = IPPROTO_ICMPV6;
2109 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2110 type = icmp6->icmp6_type; /* keep type for statistics */
2111 code = icmp6->icmp6_code; /* ditto. */
2116 * If the incoming packet was addressed directly to us (i.e. unicast),
2117 * use dst as the src for the reply.
2118 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2119 * (for example) when we encounter an error while forwarding procedure
2120 * destined to a duplicated address of ours.
2122 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
2123 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
2124 if (ia != NULL && !(ia->ia6_flags &
2125 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2126 src6 = ia->ia_addr.sin6_addr;
2129 if (m->m_pkthdr.rcvif != NULL) {
2130 /* XXX: This may not be the outgoing interface */
2131 hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2133 hlim = V_ip6_defhlim;
2136 ifa_free(&ia->ia_ifa);
2141 struct in6_addr dst6;
2145 * This case matches to multicasts, our anycast, or unicasts
2146 * that we do not own. Select a source address based on the
2147 * source address of the erroneous packet.
2149 in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
2150 error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
2151 scopeid, NULL, &src6, &hlim);
2154 char ip6buf[INET6_ADDRSTRLEN];
2156 "icmp6_reflect: source can't be determined: "
2157 "dst=%s, error=%d\n",
2158 ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
2164 * ip6_input() drops a packet if its src is multicast.
2165 * So, the src is never multicast.
2167 ip6->ip6_dst = ip6->ip6_src;
2168 ip6->ip6_src = *srcp;
2170 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2171 ip6->ip6_vfc |= IPV6_VERSION;
2172 ip6->ip6_nxt = IPPROTO_ICMPV6;
2173 ip6->ip6_hlim = hlim;
2175 icmp6->icmp6_cksum = 0;
2176 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2177 sizeof(struct ip6_hdr), plen);
2180 * XXX option handling
2183 m->m_flags &= ~(M_BCAST|M_MCAST);
2184 m->m_pkthdr.rcvif = NULL;
2185 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2187 icmp6_ifoutstat_inc(outif, type, code);
2197 icmp6_fasttimo(void)
2204 icmp6_slowtimo(void)
2211 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2212 struct in6_addr *tgt6)
2214 static char buf[1024];
2215 char ip6bufs[INET6_ADDRSTRLEN];
2216 char ip6bufd[INET6_ADDRSTRLEN];
2217 char ip6buft[INET6_ADDRSTRLEN];
2218 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2219 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2220 ip6_sprintf(ip6buft, tgt6));
2225 icmp6_redirect_input(struct mbuf *m, int off)
2228 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2229 struct nd_redirect *nd_rd;
2230 int icmp6len = ntohs(ip6->ip6_plen);
2231 char *lladdr = NULL;
2235 struct in6_addr src6 = ip6->ip6_src;
2236 struct in6_addr redtgt6;
2237 struct in6_addr reddst6;
2238 union nd_opts ndopts;
2239 char ip6buf[INET6_ADDRSTRLEN];
2242 KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
2244 ifp = m->m_pkthdr.rcvif;
2246 /* XXX if we are router, we don't update route by icmp6 redirect */
2247 if (V_ip6_forwarding)
2249 if (!V_icmp6_rediraccept)
2252 /* RFC 6980: Nodes MUST silently ignore fragments */
2253 if(m->m_flags & M_FRAGMENTED)
2256 #ifndef PULLDOWN_TEST
2257 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2258 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2260 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2261 if (nd_rd == NULL) {
2262 ICMP6STAT_INC(icp6s_tooshort);
2266 redtgt6 = nd_rd->nd_rd_target;
2267 reddst6 = nd_rd->nd_rd_dst;
2269 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2270 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2275 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2277 "ICMP6 redirect sent from %s rejected; "
2278 "must be from linklocal\n",
2279 ip6_sprintf(ip6buf, &src6)));
2282 if (ip6->ip6_hlim != 255) {
2284 "ICMP6 redirect sent from %s rejected; "
2285 "hlim=%d (must be 255)\n",
2286 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2290 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2291 struct nhop6_basic nh6;
2292 struct in6_addr kdst;
2295 in6_splitscope(&reddst6, &kdst, &scopeid);
2296 if (fib6_lookup_nh_basic(ifp->if_fib, &kdst, scopeid, 0, 0,&nh6)==0){
2297 if ((nh6.nh_flags & NHF_GATEWAY) == 0) {
2299 "ICMP6 redirect rejected; no route "
2300 "with inet6 gateway found for redirect dst: %s\n",
2301 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2306 * Embed scope zone id into next hop address, since
2307 * fib6_lookup_nh_basic() returns address without embedded
2310 if (in6_setscope(&nh6.nh_addr, m->m_pkthdr.rcvif, NULL))
2313 if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) {
2315 "ICMP6 redirect rejected; "
2316 "not equal to gw-for-src=%s (must be same): "
2318 ip6_sprintf(ip6buf, &nh6.nh_addr),
2319 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2324 "ICMP6 redirect rejected; "
2325 "no route found for redirect dst: %s\n",
2326 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2330 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2332 "ICMP6 redirect rejected; "
2333 "redirect dst must be unicast: %s\n",
2334 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2338 is_router = is_onlink = 0;
2339 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2340 is_router = 1; /* router case */
2341 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2342 is_onlink = 1; /* on-link destination case */
2343 if (!is_router && !is_onlink) {
2345 "ICMP6 redirect rejected; "
2346 "neither router case nor onlink case: %s\n",
2347 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2351 icmp6len -= sizeof(*nd_rd);
2352 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2353 if (nd6_options(&ndopts) < 0) {
2354 nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
2355 __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2356 /* nd6_options have incremented stats */
2360 if (ndopts.nd_opts_tgt_lladdr) {
2361 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2362 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2365 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2366 nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
2367 "(if %d, icmp6 packet %d): %s\n",
2368 __func__, ip6_sprintf(ip6buf, &redtgt6),
2369 ifp->if_addrlen, lladdrlen - 2,
2370 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2374 /* Validation passed. */
2377 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2378 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2381 * Install a gateway route in the better-router case or an interface
2382 * route in the on-link-destination case.
2385 struct sockaddr_in6 sdst;
2386 struct sockaddr_in6 sgw;
2387 struct sockaddr_in6 ssrc;
2388 struct sockaddr *gw;
2392 bzero(&sdst, sizeof(sdst));
2393 bzero(&ssrc, sizeof(ssrc));
2394 sdst.sin6_family = ssrc.sin6_family = AF_INET6;
2395 sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
2396 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2397 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2398 rt_flags = RTF_HOST;
2400 bzero(&sgw, sizeof(sgw));
2401 sgw.sin6_family = AF_INET6;
2402 sgw.sin6_len = sizeof(struct sockaddr_in6);
2403 bcopy(&redtgt6, &sgw.sin6_addr,
2404 sizeof(struct in6_addr));
2405 gw = (struct sockaddr *)&sgw;
2406 rt_flags |= RTF_GATEWAY;
2408 gw = ifp->if_addr->ifa_addr;
2409 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
2410 in6_rtredirect((struct sockaddr *)&sdst, gw,
2411 (struct sockaddr *)NULL, rt_flags,
2412 (struct sockaddr *)&ssrc, fibnum);
2414 /* finally update cached route in each socket via pfctlinput */
2416 struct sockaddr_in6 sdst;
2418 bzero(&sdst, sizeof(sdst));
2419 sdst.sin6_family = AF_INET6;
2420 sdst.sin6_len = sizeof(struct sockaddr_in6);
2421 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2422 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2430 ICMP6STAT_INC(icp6s_badredirect);
2435 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2437 struct ifnet *ifp; /* my outgoing interface */
2438 struct in6_addr *ifp_ll6;
2439 struct in6_addr *router_ll6;
2440 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2441 struct mbuf *m = NULL; /* newly allocated one */
2443 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2444 struct nd_redirect *nd_rd;
2445 struct llentry *ln = NULL;
2448 struct ifnet *outif = NULL;
2449 struct sockaddr_in6 src_sa;
2451 icmp6_errcount(ND_REDIRECT, 0);
2453 /* if we are not router, we don't send icmp6 redirect */
2454 if (!V_ip6_forwarding)
2458 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2463 * the source address must identify a neighbor, and
2464 * the destination address must not be a multicast address
2465 * [RFC 2461, sec 8.2]
2467 sip6 = mtod(m0, struct ip6_hdr *);
2468 bzero(&src_sa, sizeof(src_sa));
2469 src_sa.sin6_family = AF_INET6;
2470 src_sa.sin6_len = sizeof(src_sa);
2471 src_sa.sin6_addr = sip6->ip6_src;
2472 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2474 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2475 goto fail; /* what should we do here? */
2478 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2482 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2483 * we almost always ask for an mbuf cluster for simplicity.
2484 * (MHLEN < IPV6_MMTU is almost always true)
2486 #if IPV6_MMTU >= MCLBYTES
2487 # error assumption failed about IPV6_MMTU and MCLBYTES
2489 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2492 M_SETFIB(m, rt->rt_fibnum);
2493 maxlen = M_TRAILINGSPACE(m);
2494 maxlen = min(IPV6_MMTU, maxlen);
2495 /* just for safety */
2496 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2497 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2502 /* get ip6 linklocal address for ifp(my outgoing interface). */
2503 struct in6_ifaddr *ia;
2504 if ((ia = in6ifa_ifpforlinklocal(ifp,
2506 IN6_IFF_ANYCAST)) == NULL)
2508 ifp_ll6 = &ia->ia_addr.sin6_addr;
2509 /* XXXRW: reference released prematurely. */
2510 ifa_free(&ia->ia_ifa);
2513 /* get ip6 linklocal address for the router. */
2514 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2515 struct sockaddr_in6 *sin6;
2516 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2517 router_ll6 = &sin6->sin6_addr;
2518 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2519 router_ll6 = (struct in6_addr *)NULL;
2521 router_ll6 = (struct in6_addr *)NULL;
2524 ip6 = mtod(m, struct ip6_hdr *);
2526 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2527 ip6->ip6_vfc |= IPV6_VERSION;
2528 /* ip6->ip6_plen will be set later */
2529 ip6->ip6_nxt = IPPROTO_ICMPV6;
2530 ip6->ip6_hlim = 255;
2531 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2532 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2533 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2536 nd_rd = (struct nd_redirect *)(ip6 + 1);
2537 nd_rd->nd_rd_type = ND_REDIRECT;
2538 nd_rd->nd_rd_code = 0;
2539 nd_rd->nd_rd_reserved = 0;
2540 if (rt->rt_flags & RTF_GATEWAY) {
2542 * nd_rd->nd_rd_target must be a link-local address in
2543 * better router cases.
2547 bcopy(router_ll6, &nd_rd->nd_rd_target,
2548 sizeof(nd_rd->nd_rd_target));
2549 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2550 sizeof(nd_rd->nd_rd_dst));
2552 /* make sure redtgt == reddst */
2553 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2554 sizeof(nd_rd->nd_rd_target));
2555 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2556 sizeof(nd_rd->nd_rd_dst));
2559 p = (u_char *)(nd_rd + 1);
2565 /* target lladdr option */
2566 struct epoch_tracker et;
2568 struct nd_opt_hdr *nd_opt;
2571 NET_EPOCH_ENTER(et);
2572 ln = nd6_lookup(router_ll6, 0, ifp);
2577 len = sizeof(*nd_opt) + ifp->if_addrlen;
2578 len = (len + 7) & ~7; /* round by 8 */
2580 if (len + (p - (u_char *)ip6) > maxlen)
2583 if (ln->la_flags & LLE_VALID) {
2584 nd_opt = (struct nd_opt_hdr *)p;
2585 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2586 nd_opt->nd_opt_len = len >> 3;
2587 lladdr = (char *)(nd_opt + 1);
2588 bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
2596 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2598 /* just to be safe */
2599 #ifdef M_DECRYPTED /*not openbsd*/
2600 if (m0->m_flags & M_DECRYPTED)
2603 if (p - (u_char *)ip6 > maxlen)
2607 /* redirected header option */
2609 struct nd_opt_rd_hdr *nd_opt_rh;
2612 * compute the maximum size for icmp6 redirect header option.
2613 * XXX room for auth header?
2615 len = maxlen - (p - (u_char *)ip6);
2618 /* This is just for simplicity. */
2619 if (m0->m_pkthdr.len != m0->m_len) {
2621 m_freem(m0->m_next);
2624 m0->m_pkthdr.len = m0->m_len;
2628 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2629 * about padding/truncate rule for the original IP packet.
2630 * From the discussion on IPv6imp in Feb 1999,
2631 * the consensus was:
2632 * - "attach as much as possible" is the goal
2633 * - pad if not aligned (original size can be guessed by
2634 * original ip6 header)
2635 * Following code adds the padding if it is simple enough,
2636 * and truncates if not.
2638 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2639 panic("assumption failed in %s:%d", __FILE__,
2642 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2643 /* not enough room, truncate */
2644 m0->m_pkthdr.len = m0->m_len = len -
2647 /* enough room, pad or truncate */
2650 extra = m0->m_pkthdr.len % 8;
2652 /* pad if easy enough, truncate if not */
2653 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2655 m0->m_len += (8 - extra);
2656 m0->m_pkthdr.len += (8 - extra);
2659 m0->m_pkthdr.len -= extra;
2663 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2664 m0->m_pkthdr.len = m0->m_len = len -
2668 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2669 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2670 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2671 nd_opt_rh->nd_opt_rh_len = len >> 3;
2672 p += sizeof(*nd_opt_rh);
2673 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2675 /* connect m0 to m */
2676 m_tag_delete_chain(m0, NULL);
2677 m0->m_flags &= ~M_PKTHDR;
2679 m->m_pkthdr.len = m->m_len + m0->m_len;
2688 /* XXX: clear embedded link IDs in the inner header */
2689 in6_clearscope(&sip6->ip6_src);
2690 in6_clearscope(&sip6->ip6_dst);
2691 in6_clearscope(&nd_rd->nd_rd_target);
2692 in6_clearscope(&nd_rd->nd_rd_dst);
2694 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2696 nd_rd->nd_rd_cksum = 0;
2697 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2698 sizeof(*ip6), ntohs(ip6->ip6_plen));
2700 if (send_sendso_input_hook != NULL) {
2701 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
2705 *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
2706 m_tag_prepend(m, mtag);
2709 /* send the packet to outside... */
2710 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2712 icmp6_ifstat_inc(outif, ifs6_out_msg);
2713 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2715 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2727 * ICMPv6 socket option processing.
2730 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2734 struct inpcb *inp = sotoinpcb(so);
2735 int level, op, optname;
2738 level = sopt->sopt_level;
2739 op = sopt->sopt_dir;
2740 optname = sopt->sopt_name;
2741 optlen = sopt->sopt_valsize;
2743 level = op = optname = optlen = 0;
2745 if (level != IPPROTO_ICMPV6) {
2754 struct icmp6_filter ic6f;
2756 if (optlen != sizeof(ic6f)) {
2760 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2763 *inp->in6p_icmp6filt = ic6f;
2770 error = ENOPROTOOPT;
2779 struct icmp6_filter ic6f;
2782 ic6f = *inp->in6p_icmp6filt;
2784 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2789 error = ENOPROTOOPT;
2799 * Perform rate limit check.
2800 * Returns 0 if it is okay to send the icmp6 packet.
2801 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2804 * XXX per-destination/type check necessary?
2806 * dst - not used at this moment
2807 * type - not used at this moment
2808 * code - not used at this moment
2811 icmp6_ratelimit(const struct in6_addr *dst, const int type,
2816 ret = 0; /* okay to send */
2819 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2820 V_icmp6errppslim)) {
2821 /* The packet is subject to rate limit */