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 #define MBUF_PRIVATE /* XXXRW: Optimisation tries to avoid M_EXT mbufs */
69 #include "opt_inet6.h"
71 #include <sys/param.h>
72 #include <sys/domain.h>
74 #include <sys/kernel.h>
76 #include <sys/malloc.h>
79 #include <sys/protosw.h>
80 #include <sys/signalvar.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
84 #include <sys/syslog.h>
85 #include <sys/systm.h>
89 #include <net/if_var.h>
90 #include <net/if_dl.h>
91 #include <net/if_llatbl.h>
92 #include <net/if_private.h>
93 #include <net/if_types.h>
94 #include <net/route.h>
95 #include <net/route/route_ctl.h>
96 #include <net/route/nhop.h>
99 #include <netinet/in.h>
100 #include <netinet/in_pcb.h>
101 #include <netinet/in_var.h>
102 #include <netinet/ip6.h>
103 #include <netinet/icmp6.h>
104 #include <netinet/tcp_var.h>
106 #include <netinet6/in6_fib.h>
107 #include <netinet6/in6_ifattach.h>
108 #include <netinet6/in6_pcb.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 ip6proto_ctlinput_t *ip6_ctlprotox[];
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(int, icmp6errppslim);
126 VNET_DEFINE_STATIC(int, icmp6errpps_count) = 0;
127 VNET_DEFINE_STATIC(struct timeval, icmp6errppslim_last);
128 VNET_DECLARE(int, icmp6_nodeinfo);
130 #define V_ripcbinfo VNET(ripcbinfo)
131 #define V_icmp6errppslim VNET(icmp6errppslim)
132 #define V_icmp6errpps_count VNET(icmp6errpps_count)
133 #define V_icmp6errppslim_last VNET(icmp6errppslim_last)
134 #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo)
136 static void icmp6_errcount(int, int);
137 static int icmp6_rip6_input(struct mbuf **, int);
138 static void icmp6_reflect(struct mbuf *, size_t);
139 static const char *icmp6_redirect_diag(struct in6_addr *,
140 struct in6_addr *, struct in6_addr *);
141 static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
142 static struct mbuf *ni6_nametodns(const char *, int, int);
143 static int ni6_dnsmatch(const char *, int, const char *, int);
144 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
145 struct ifnet **, struct in6_addr *);
146 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
147 struct ifnet *, int);
148 static int icmp6_notify_error(struct mbuf **, int, int);
151 * Kernel module interface for updating icmp6stat. The argument is an index
152 * into icmp6stat treated as an array of u_quad_t. While this encodes the
153 * general layout of icmp6stat into the caller, it doesn't encode its
154 * location, so that future changes to add, for example, per-CPU stats
155 * support won't cause binary compatibility problems for kernel modules.
158 kmod_icmp6stat_inc(int statnum)
161 counter_u64_add(VNET(icmp6stat)[statnum], 1);
165 icmp6_errcount(int type, int code)
168 case ICMP6_DST_UNREACH:
170 case ICMP6_DST_UNREACH_NOROUTE:
171 ICMP6STAT_INC(icp6s_odst_unreach_noroute);
173 case ICMP6_DST_UNREACH_ADMIN:
174 ICMP6STAT_INC(icp6s_odst_unreach_admin);
176 case ICMP6_DST_UNREACH_BEYONDSCOPE:
177 ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
179 case ICMP6_DST_UNREACH_ADDR:
180 ICMP6STAT_INC(icp6s_odst_unreach_addr);
182 case ICMP6_DST_UNREACH_NOPORT:
183 ICMP6STAT_INC(icp6s_odst_unreach_noport);
187 case ICMP6_PACKET_TOO_BIG:
188 ICMP6STAT_INC(icp6s_opacket_too_big);
190 case ICMP6_TIME_EXCEEDED:
192 case ICMP6_TIME_EXCEED_TRANSIT:
193 ICMP6STAT_INC(icp6s_otime_exceed_transit);
195 case ICMP6_TIME_EXCEED_REASSEMBLY:
196 ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
200 case ICMP6_PARAM_PROB:
202 case ICMP6_PARAMPROB_HEADER:
203 ICMP6STAT_INC(icp6s_oparamprob_header);
205 case ICMP6_PARAMPROB_NEXTHEADER:
206 ICMP6STAT_INC(icp6s_oparamprob_nextheader);
208 case ICMP6_PARAMPROB_OPTION:
209 ICMP6STAT_INC(icp6s_oparamprob_option);
214 ICMP6STAT_INC(icp6s_oredirect);
217 ICMP6STAT_INC(icp6s_ounknown);
221 * A wrapper function for icmp6_error() necessary when the erroneous packet
222 * may not contain enough scope zone information.
225 icmp6_error2(struct mbuf *m, int type, int code, int param,
233 if (m->m_len < sizeof(struct ip6_hdr)) {
234 m = m_pullup(m, sizeof(struct ip6_hdr));
236 IP6STAT_INC(ip6s_exthdrtoolong);
240 ip6 = mtod(m, struct ip6_hdr *);
242 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
244 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
247 icmp6_error(m, type, code, param);
251 * Generate an error packet of type error in response to bad IP6 packet.
254 icmp6_error(struct mbuf *m, int type, int code, int param)
256 struct ip6_hdr *oip6, *nip6;
257 struct icmp6_hdr *icmp6;
258 struct epoch_tracker et;
263 ICMP6STAT_INC(icp6s_error);
265 /* count per-type-code statistics */
266 icmp6_errcount(type, code);
268 #ifdef M_DECRYPTED /*not openbsd*/
269 if (m->m_flags & M_DECRYPTED) {
270 ICMP6STAT_INC(icp6s_canterror);
275 if (m->m_len < sizeof(struct ip6_hdr)) {
276 m = m_pullup(m, sizeof(struct ip6_hdr));
278 IP6STAT_INC(ip6s_exthdrtoolong);
282 oip6 = mtod(m, struct ip6_hdr *);
285 * If the destination address of the erroneous packet is a multicast
286 * address, or the packet was sent using link-layer multicast,
287 * we should basically suppress sending an error (RFC 2463, Section
289 * We have two exceptions (the item e.2 in that section):
290 * - the Packet Too Big message can be sent for path MTU discovery.
291 * - the Parameter Problem Message that can be allowed an icmp6 error
292 * in the option type field. This check has been done in
293 * ip6_unknown_opt(), so we can just check the type and code.
295 if ((m->m_flags & (M_BCAST|M_MCAST) ||
296 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
297 (type != ICMP6_PACKET_TOO_BIG &&
298 (type != ICMP6_PARAM_PROB ||
299 code != ICMP6_PARAMPROB_OPTION)))
303 * RFC 2463, 2.4 (e.5): source address check.
304 * XXX: the case of anycast source?
306 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
307 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
311 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
315 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
316 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
317 struct icmp6_hdr *icp;
319 if (m->m_len < off + sizeof(struct icmp6_hdr)) {
320 m = m_pullup(m, off + sizeof(struct icmp6_hdr));
322 IP6STAT_INC(ip6s_exthdrtoolong);
326 oip6 = mtod(m, struct ip6_hdr *);
327 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
329 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
330 icp->icmp6_type == ND_REDIRECT) {
333 * Special case: for redirect (which is
334 * informational) we must not send icmp6 error.
336 ICMP6STAT_INC(icp6s_canterror);
339 /* ICMPv6 informational - send the error */
342 /* non-ICMPv6 - send the error */
345 /* Finally, do rate limitation check. */
346 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
347 ICMP6STAT_INC(icp6s_toofreq);
352 * OK, ICMP6 can be generated.
355 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
356 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
358 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
359 M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */
361 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
365 nip6 = mtod(m, struct ip6_hdr *);
366 nip6->ip6_src = oip6->ip6_src;
367 nip6->ip6_dst = oip6->ip6_dst;
369 in6_clearscope(&oip6->ip6_src);
370 in6_clearscope(&oip6->ip6_dst);
372 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
373 icmp6->icmp6_type = type;
374 icmp6->icmp6_code = code;
375 icmp6->icmp6_pptr = htonl((u_int32_t)param);
377 ICMP6STAT_INC(icp6s_outhist[type]);
379 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
386 * If we can't tell whether or not we can generate ICMP6, free it.
392 icmp6_errmap(const struct icmp6_hdr *icmp6)
395 switch (icmp6->icmp6_type) {
396 case ICMP6_DST_UNREACH:
397 switch (icmp6->icmp6_code) {
398 case ICMP6_DST_UNREACH_NOROUTE:
399 case ICMP6_DST_UNREACH_ADDR:
400 return (EHOSTUNREACH);
401 case ICMP6_DST_UNREACH_NOPORT:
402 case ICMP6_DST_UNREACH_ADMIN:
403 return (ECONNREFUSED);
404 case ICMP6_DST_UNREACH_BEYONDSCOPE:
405 return (ENOPROTOOPT);
407 return (0); /* Shouldn't happen. */
409 case ICMP6_PACKET_TOO_BIG:
411 case ICMP6_TIME_EXCEEDED:
412 switch (icmp6->icmp6_code) {
413 case ICMP6_TIME_EXCEED_TRANSIT:
414 return (EHOSTUNREACH);
415 case ICMP6_TIME_EXCEED_REASSEMBLY:
418 return (0); /* Shouldn't happen. */
420 case ICMP6_PARAM_PROB:
421 switch (icmp6->icmp6_code) {
422 case ICMP6_PARAMPROB_NEXTHEADER:
423 return (ECONNREFUSED);
424 case ICMP6_PARAMPROB_HEADER:
425 case ICMP6_PARAMPROB_OPTION:
426 return (ENOPROTOOPT);
428 return (0); /* Shouldn't happen. */
436 * Process a received ICMP6 message.
439 icmp6_input(struct mbuf **mp, int *offp, int proto)
443 struct ip6_hdr *ip6, *nip6;
444 struct icmp6_hdr *icmp6, *nicmp6;
445 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
446 int code, error, icmp6len, ip6len, noff, off, sum;
453 if (m->m_len < off + sizeof(struct icmp6_hdr)) {
454 m = m_pullup(m, off + sizeof(struct icmp6_hdr));
456 IP6STAT_INC(ip6s_exthdrtoolong);
458 return (IPPROTO_DONE);
463 * Locate icmp6 structure in mbuf, and check
464 * that not corrupted and of at least minimum length
467 icmp6len = m->m_pkthdr.len - off;
468 if (icmp6len < sizeof(struct icmp6_hdr)) {
469 ICMP6STAT_INC(icp6s_tooshort);
473 ip6 = mtod(m, struct ip6_hdr *);
474 ifp = m->m_pkthdr.rcvif;
476 * Check multicast group membership.
477 * Note: SSM filters are not applied for ICMPv6 traffic.
479 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
480 struct in6_multi *inm;
482 inm = in6m_lookup(ifp, &ip6->ip6_dst);
484 IP6STAT_INC(ip6s_notmember);
485 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
490 /* Calculate the checksum. */
491 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
492 code = icmp6->icmp6_code;
493 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
495 "ICMP6 checksum error(%d|%x) %s\n",
496 icmp6->icmp6_type, sum,
497 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
498 ICMP6STAT_INC(icp6s_checksum);
502 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
503 icmp6_ifstat_inc(ifp, ifs6_in_msg);
504 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
505 icmp6_ifstat_inc(ifp, ifs6_in_error);
507 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
508 switch (icmp6->icmp6_type) {
509 case ICMP6_DST_UNREACH:
510 icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
512 case ICMP6_DST_UNREACH_ADMIN:
513 icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
514 case ICMP6_DST_UNREACH_NOROUTE:
515 case ICMP6_DST_UNREACH_ADDR:
516 case ICMP6_DST_UNREACH_BEYONDSCOPE:
517 case ICMP6_DST_UNREACH_NOPORT:
522 case ICMP6_PACKET_TOO_BIG:
523 icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
525 * Validation is made in icmp6_mtudisc_update.
526 * Updating the path MTU will be done after examining
527 * intermediate extension headers.
530 case ICMP6_TIME_EXCEEDED:
531 icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
533 case ICMP6_TIME_EXCEED_TRANSIT:
534 case ICMP6_TIME_EXCEED_REASSEMBLY:
539 case ICMP6_PARAM_PROB:
540 icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
542 case ICMP6_PARAMPROB_NEXTHEADER:
543 case ICMP6_PARAMPROB_HEADER:
544 case ICMP6_PARAMPROB_OPTION:
549 case ICMP6_ECHO_REQUEST:
550 icmp6_ifstat_inc(ifp, ifs6_in_echo);
553 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
558 || n->m_len < off + sizeof(struct icmp6_hdr)) {
562 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
563 n = m_gethdr(M_NOWAIT, n0->m_type);
570 m_move_pkthdr(n, n0); /* FIB copied. */
571 n0len = n0->m_pkthdr.len; /* save for use below */
573 * Copy IPv6 and ICMPv6 only.
575 nip6 = mtod(n, struct ip6_hdr *);
576 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
577 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
578 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
579 noff = sizeof(struct ip6_hdr);
580 /* new mbuf contains only ipv6+icmpv6 headers */
581 n->m_len = noff + sizeof(struct icmp6_hdr);
583 * Adjust mbuf. ip6_plen will be adjusted in
586 m_adj(n0, off + sizeof(struct icmp6_hdr));
587 /* recalculate complete packet size */
588 n->m_pkthdr.len = n0len + (noff - off);
591 if (n->m_len < off + sizeof(*nicmp6)) {
592 n = m_pullup(n, off + sizeof(*nicmp6));
594 IP6STAT_INC(ip6s_exthdrtoolong);
598 nicmp6 = (struct icmp6_hdr *)(mtod(n, caddr_t) + off);
602 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
603 nicmp6->icmp6_code = 0;
604 ICMP6STAT_INC(icp6s_reflect);
605 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
606 icmp6_reflect(n, noff);
610 case ICMP6_ECHO_REPLY:
611 icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
616 case MLD_LISTENER_QUERY:
617 case MLD_LISTENER_REPORT:
618 case MLD_LISTENER_DONE:
619 case MLDV2_LISTENER_REPORT:
621 * Drop MLD traffic which is not link-local, has a hop limit
622 * of greater than 1 hop, or which does not have the
623 * IPv6 HBH Router Alert option.
624 * As IPv6 HBH options are stripped in ip6_input() we must
625 * check an mbuf header flag.
626 * XXX Should we also sanity check that these messages
627 * were directed to a link-local multicast prefix?
629 if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
631 if (mld_input(&m, off, icmp6len) != 0) {
633 return (IPPROTO_DONE);
638 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
640 enum { WRU, FQDN } mode;
643 if (!V_icmp6_nodeinfo)
646 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
648 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
654 sx_slock(&allprison_lock);
655 TAILQ_FOREACH(pr, &allprison, pr_list)
656 if (pr->pr_vnet == ifp->if_vnet)
658 sx_sunlock(&allprison_lock);
660 pr = curthread->td_ucred->cr_prison;
662 if (m->m_len < off + sizeof(struct icmp6_nodeinfo)) {
663 m = m_pullup(m, off +
664 sizeof(struct icmp6_nodeinfo));
666 IP6STAT_INC(ip6s_exthdrtoolong);
668 return (IPPROTO_DONE);
671 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
673 n = ni6_input(n, off, pr);
674 /* XXX meaningless if n == NULL */
675 noff = sizeof(struct ip6_hdr);
681 * XXX: this combination of flags is pointless,
682 * but should we keep this for compatibility?
684 if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
685 ICMP6_NODEINFO_TMPADDROK)) !=
686 (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
692 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
693 n = m_gethdr(M_NOWAIT, m->m_type);
698 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
700 * Previous code did a blind M_COPY_PKTHDR
701 * and said "just for rcvif". If true, then
702 * we could tolerate the dup failing (due to
703 * the deep copy of the tag chain). For now
704 * be conservative and just fail.
711 * Copy IPv6 and ICMPv6 only.
713 nip6 = mtod(n, struct ip6_hdr *);
714 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
715 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
716 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
717 p = (u_char *)(nicmp6 + 1);
720 maxhlen = M_TRAILINGSPACE(n) -
721 (sizeof(*nip6) + sizeof(*nicmp6) + 4);
722 mtx_lock(&pr->pr_mtx);
723 hlen = strlen(pr->pr_hostname);
726 /* meaningless TTL */
727 bcopy(pr->pr_hostname, p + 4, maxhlen);
728 mtx_unlock(&pr->pr_mtx);
729 noff = sizeof(struct ip6_hdr);
730 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
731 sizeof(struct icmp6_hdr) + 4 + maxhlen;
732 nicmp6->icmp6_type = ICMP6_WRUREPLY;
733 nicmp6->icmp6_code = 0;
736 ICMP6STAT_INC(icp6s_reflect);
737 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
738 icmp6_reflect(n, noff);
748 case ND_ROUTER_SOLICIT:
749 icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
752 if (icmp6len < sizeof(struct nd_router_solicit))
754 if (send_sendso_input_hook != NULL) {
755 if (m->m_len < off + icmp6len) {
756 m = m_pullup(m, off + icmp6len);
758 IP6STAT_INC(ip6s_exthdrtoolong);
760 return (IPPROTO_DONE);
763 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
769 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
770 nd6_rs_input(m, off, icmp6len);
776 case ND_ROUTER_ADVERT:
777 icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
780 if (icmp6len < sizeof(struct nd_router_advert))
782 if (send_sendso_input_hook != NULL) {
783 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
789 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
790 nd6_ra_input(m, off, icmp6len);
796 case ND_NEIGHBOR_SOLICIT:
797 icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
800 if (icmp6len < sizeof(struct nd_neighbor_solicit))
802 if (send_sendso_input_hook != NULL) {
803 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
809 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
810 nd6_ns_input(m, off, icmp6len);
816 case ND_NEIGHBOR_ADVERT:
817 icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
820 if (icmp6len < sizeof(struct nd_neighbor_advert))
822 if (send_sendso_input_hook != NULL) {
823 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
829 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
830 nd6_na_input(m, off, icmp6len);
837 icmp6_ifstat_inc(ifp, ifs6_in_redirect);
840 if (icmp6len < sizeof(struct nd_redirect))
842 if (send_sendso_input_hook != NULL) {
843 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
849 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
850 icmp6_redirect_input(m, off);
856 case ICMP6_ROUTER_RENUMBERING:
857 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
858 code != ICMP6_ROUTER_RENUMBERING_RESULT)
860 if (icmp6len < sizeof(struct icmp6_router_renum))
866 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
867 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
868 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
869 ifp ? ifp->if_index : 0));
870 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
871 /* ICMPv6 error: MUST deliver it by spec... */
874 /* ICMPv6 informational: MUST not deliver */
878 if (icmp6_notify_error(&m, off, icmp6len) != 0) {
879 /* In this case, m should've been freed. */
881 return (IPPROTO_DONE);
886 ICMP6STAT_INC(icp6s_badcode);
890 ICMP6STAT_INC(icp6s_badlen);
894 /* deliver the packet to appropriate sockets */
895 icmp6_rip6_input(&m, *offp);
898 return (IPPROTO_DONE);
903 return (IPPROTO_DONE);
907 icmp6_notify_error(struct mbuf **mp, int off, int icmp6len)
910 struct icmp6_hdr *icmp6;
911 struct ip6_hdr *eip6;
913 struct sockaddr_in6 icmp6src, icmp6dst;
917 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
918 ICMP6STAT_INC(icp6s_tooshort);
922 if (m->m_len < off + sizeof(*icmp6) + sizeof(struct ip6_hdr)) {
923 m = m_pullup(m, off + sizeof(*icmp6) + sizeof(struct ip6_hdr));
925 IP6STAT_INC(ip6s_exthdrtoolong);
930 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
931 eip6 = (struct ip6_hdr *)(icmp6 + 1);
932 bzero(&icmp6dst, sizeof(icmp6dst));
934 /* Detect the upper level protocol */
936 u_int8_t nxt = eip6->ip6_nxt;
937 int eoff = off + sizeof(struct icmp6_hdr) +
938 sizeof(struct ip6_hdr);
939 struct ip6ctlparam ip6cp;
940 int icmp6type = icmp6->icmp6_type;
942 struct ip6_rthdr *rth;
943 struct ip6_rthdr0 *rth0;
946 while (1) { /* XXX: should avoid infinite loop explicitly? */
950 case IPPROTO_HOPOPTS:
951 case IPPROTO_DSTOPTS:
953 if (m->m_len < eoff + sizeof(struct ip6_ext)) {
954 m = m_pullup(m, eoff +
955 sizeof(struct ip6_ext));
957 IP6STAT_INC(ip6s_exthdrtoolong);
962 eh = (struct ip6_ext *)
963 (mtod(m, caddr_t) + eoff);
964 if (nxt == IPPROTO_AH)
965 eoff += (eh->ip6e_len + 2) << 2;
967 eoff += (eh->ip6e_len + 1) << 3;
970 case IPPROTO_ROUTING:
972 * When the erroneous packet contains a
973 * routing header, we should examine the
974 * header to determine the final destination.
975 * Otherwise, we can't properly update
976 * information that depends on the final
977 * destination (e.g. path MTU).
979 if (m->m_len < eoff + sizeof(*rth)) {
980 m = m_pullup(m, eoff + sizeof(*rth));
982 IP6STAT_INC(ip6s_exthdrtoolong);
987 rth = (struct ip6_rthdr *)
988 (mtod(m, caddr_t) + eoff);
989 rthlen = (rth->ip6r_len + 1) << 3;
991 * XXX: currently there is no
992 * officially defined type other
994 * Note that if the segment left field
995 * is 0, all intermediate hops must
998 if (rth->ip6r_segleft &&
999 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1002 if (m->m_len < eoff + rthlen) {
1003 m = m_pullup(m, eoff + rthlen);
1006 ip6s_exthdrtoolong);
1011 rth0 = (struct ip6_rthdr0 *)
1012 (mtod(m, caddr_t) + eoff);
1014 /* just ignore a bogus header */
1015 if ((rth0->ip6r0_len % 2) == 0 &&
1016 (hops = rth0->ip6r0_len/2))
1017 icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1));
1020 nxt = rth->ip6r_nxt;
1022 case IPPROTO_FRAGMENT:
1023 if (m->m_len < eoff + sizeof(struct ip6_frag)) {
1024 m = m_pullup(m, eoff +
1025 sizeof(struct ip6_frag));
1027 IP6STAT_INC(ip6s_exthdrtoolong);
1032 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1035 * Data after a fragment header is meaningless
1036 * unless it is the first fragment, but
1037 * we'll go to the notify label for path MTU
1040 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1043 eoff += sizeof(struct ip6_frag);
1048 * This case includes ESP and the No Next
1049 * Header. In such cases going to the notify
1050 * label does not have any meaning
1051 * (i.e. ctlfunc will be NULL), but we go
1052 * anyway since we might have to update
1053 * path MTU information.
1059 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1062 * retrieve parameters from the inner IPv6 header, and convert
1063 * them into sockaddr structures.
1064 * XXX: there is no guarantee that the source or destination
1065 * addresses of the inner packet are in the same scope as
1066 * the addresses of the icmp packet. But there is no other
1067 * way to determine the zone.
1069 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1072 * Protocol layers can't do anything useful with unspecified
1075 if (IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_src) ||
1076 IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_dst))
1079 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1080 icmp6dst.sin6_family = AF_INET6;
1081 if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr))
1082 icmp6dst.sin6_addr = eip6->ip6_dst;
1083 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1085 bzero(&icmp6src, sizeof(icmp6src));
1086 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1087 icmp6src.sin6_family = AF_INET6;
1088 icmp6src.sin6_addr = eip6->ip6_src;
1089 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1091 icmp6src.sin6_flowinfo =
1092 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1095 ip6cp.ip6c_icmp6 = icmp6;
1096 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1097 ip6cp.ip6c_off = eoff;
1098 ip6cp.ip6c_finaldst = &icmp6dst;
1099 ip6cp.ip6c_src = &icmp6src;
1100 ip6cp.ip6c_nxt = nxt;
1102 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1103 notifymtu = ntohl(icmp6->icmp6_mtu);
1104 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1105 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1108 if (ip6_ctlprotox[nxt] != NULL)
1109 ip6_ctlprotox[nxt](&ip6cp);
1121 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1123 struct in6_addr *dst = &ip6cp->ip6c_finaldst->sin6_addr;
1124 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1125 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1126 u_int mtu = ntohl(icmp6->icmp6_mtu);
1127 struct in_conninfo inc;
1132 * RFC2460 section 5, last paragraph.
1133 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1134 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1135 * due to packet translator in the middle.
1136 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1139 if (mtu < IPV6_MMTU)
1144 * we reject ICMPv6 too big with abnormally small value.
1145 * XXX what is the good definition of "abnormally small"?
1147 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1154 * In case the suggested mtu is less than IPV6_MMTU, we
1155 * only need to remember that it was for above mentioned
1156 * "alwaysfrag" case.
1157 * Try to be as close to the spec as possible.
1159 if (mtu < IPV6_MMTU)
1160 mtu = IPV6_MMTU - 8;
1162 bzero(&inc, sizeof(inc));
1163 inc.inc_fibnum = M_GETFIB(m);
1164 inc.inc_flags |= INC_ISIPV6;
1165 inc.inc6_faddr = *dst;
1166 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1169 max_mtu = tcp_hc_getmtu(&inc);
1171 max_mtu = tcp_maxmtu6(&inc, NULL);
1173 if (mtu < max_mtu) {
1174 tcp_hc_updatemtu(&inc, mtu);
1175 ICMP6STAT_INC(icp6s_pmtuchg);
1180 * Process a Node Information Query packet, based on
1181 * draft-ietf-ipngwg-icmp-name-lookups-07.
1183 * Spec incompatibilities:
1184 * - IPv6 Subject address handling
1185 * - IPv4 Subject address handling support missing
1186 * - Proxy reply (answer even if it's not for me)
1187 * - joins NI group address at in6_ifattach() time only, does not cope
1188 * with hostname changes by sethostname(3)
1190 static struct mbuf *
1191 ni6_input(struct mbuf *m, int off, struct prison *pr)
1193 struct icmp6_nodeinfo *ni6, *nni6;
1194 struct mbuf *n = NULL;
1197 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1198 struct ni_reply_fqdn *fqdn;
1199 int addrs; /* for NI_QTYPE_NODEADDR */
1200 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1201 struct in6_addr in6_subj; /* subject address */
1202 struct ip6_hdr *ip6;
1203 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1205 struct in6_ifaddr *ia6 = NULL;
1207 ip6 = mtod(m, struct ip6_hdr *);
1208 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1211 * Validate IPv6 source address.
1212 * The default configuration MUST be to refuse answering queries from
1213 * global-scope addresses according to RFC4602.
1215 * - it's not very clear what "refuse" means; this implementation
1217 * - it's not very easy to identify global-scope (unicast) addresses
1218 * since there are many prefixes for them. It should be safer
1219 * and in practice sufficient to check "all" but loopback and
1220 * link-local (note that site-local unicast was deprecated and
1221 * ULA is defined as global scope-wise)
1223 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1224 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1225 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1229 * Validate IPv6 destination address.
1231 * The Responder must discard the Query without further processing
1232 * unless it is one of the Responder's unicast or anycast addresses, or
1233 * a link-local scope multicast address which the Responder has joined.
1234 * [RFC4602, Section 5.]
1236 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1237 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1239 /* else it's a link-local multicast, fine */
1240 } else { /* unicast or anycast */
1241 ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
1243 goto bad; /* XXX impossible */
1245 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1246 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1247 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1248 "a temporary address in %s:%d",
1249 __FILE__, __LINE__));
1254 /* validate query Subject field. */
1255 qtype = ntohs(ni6->ni_qtype);
1256 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1259 case NI_QTYPE_SUPTYPES:
1261 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1265 case NI_QTYPE_NODEADDR:
1266 case NI_QTYPE_IPV4ADDR:
1267 switch (ni6->ni_code) {
1268 case ICMP6_NI_SUBJ_IPV6:
1269 #if ICMP6_NI_SUBJ_IPV6 != 0
1273 * backward compatibility - try to accept 03 draft
1274 * format, where no Subject is present.
1276 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1281 #if ICMP6_NI_SUBJ_IPV6 != 0
1282 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1286 if (subjlen != sizeof(struct in6_addr))
1290 * Validate Subject address.
1292 * Not sure what exactly "address belongs to the node"
1293 * means in the spec, is it just unicast, or what?
1295 * At this moment we consider Subject address as
1296 * "belong to the node" if the Subject address equals
1297 * to the IPv6 destination address; validation for
1298 * IPv6 destination address should have done enough
1301 * We do not do proxy at this moment.
1303 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1304 subjlen, (caddr_t)&in6_subj);
1305 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1308 subj = (char *)&in6_subj;
1309 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1313 * XXX if we are to allow other cases, we should really
1314 * be careful about scope here.
1315 * basically, we should disallow queries toward IPv6
1316 * destination X with subject Y,
1317 * if scope(X) > scope(Y).
1318 * if we allow scope(X) > scope(Y), it will result in
1319 * information leakage across scope boundary.
1323 case ICMP6_NI_SUBJ_FQDN:
1325 * Validate Subject name with gethostname(3).
1327 * The behavior may need some debate, since:
1328 * - we are not sure if the node has FQDN as
1329 * hostname (returned by gethostname(3)).
1330 * - the code does wildcard match for truncated names.
1331 * however, we are not sure if we want to perform
1332 * wildcard match, if gethostname(3) side has
1333 * truncated hostname.
1335 mtx_lock(&pr->pr_mtx);
1336 n = ni6_nametodns(pr->pr_hostname,
1337 strlen(pr->pr_hostname), 0);
1338 mtx_unlock(&pr->pr_mtx);
1339 if (!n || n->m_next || n->m_len == 0)
1341 if (m->m_len < off + sizeof(struct icmp6_nodeinfo) +
1343 m = m_pullup(m, off +
1344 sizeof(struct icmp6_nodeinfo) + subjlen);
1346 IP6STAT_INC(ip6s_exthdrtoolong);
1350 /* ip6 possibly invalid but not used after. */
1351 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1352 subj = (char *)(mtod(m, caddr_t) + off +
1353 sizeof(struct icmp6_nodeinfo));
1354 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1362 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1369 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1372 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1375 case NI_QTYPE_NODEADDR:
1376 case NI_QTYPE_IPV4ADDR:
1377 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1382 /* guess reply length */
1385 break; /* no reply data */
1386 case NI_QTYPE_SUPTYPES:
1387 replylen += sizeof(u_int32_t);
1390 /* XXX will append an mbuf */
1391 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1393 case NI_QTYPE_NODEADDR:
1394 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1395 if ((replylen += addrs * (sizeof(struct in6_addr) +
1396 sizeof(u_int32_t))) > MCLBYTES)
1397 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1399 case NI_QTYPE_IPV4ADDR:
1400 /* unsupported - should respond with unknown Qtype? */
1404 * XXX: We must return a reply with the ICMP6 code
1405 * `unknown Qtype' in this case. However we regard the case
1406 * as an FQDN query for backward compatibility.
1407 * Older versions set a random value to this field,
1408 * so it rarely varies in the defined qtypes.
1409 * But the mechanism is not reliable...
1410 * maybe we should obsolete older versions.
1412 qtype = NI_QTYPE_FQDN;
1413 /* XXX will append an mbuf */
1414 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1419 /* Allocate an mbuf to reply. */
1420 if (replylen > MCLBYTES) {
1422 * XXX: should we try to allocate more? But MCLBYTES
1423 * is probably much larger than IPV6_MMTU...
1427 if (replylen > MHLEN)
1428 n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
1430 n = m_gethdr(M_NOWAIT, m->m_type);
1435 m_move_pkthdr(n, m); /* just for recvif and FIB */
1436 n->m_pkthdr.len = n->m_len = replylen;
1438 /* copy mbuf header and IPv6 + Node Information base headers */
1439 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1440 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1441 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1443 /* qtype dependent procedure */
1446 nni6->ni_code = ICMP6_NI_SUCCESS;
1449 case NI_QTYPE_SUPTYPES:
1452 nni6->ni_code = ICMP6_NI_SUCCESS;
1453 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1454 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1455 v = (u_int32_t)htonl(0x0000000f);
1456 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1460 nni6->ni_code = ICMP6_NI_SUCCESS;
1461 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1462 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1463 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1464 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1466 * XXX do we really have FQDN in hostname?
1468 mtx_lock(&pr->pr_mtx);
1469 n->m_next = ni6_nametodns(pr->pr_hostname,
1470 strlen(pr->pr_hostname), oldfqdn);
1471 mtx_unlock(&pr->pr_mtx);
1472 if (n->m_next == NULL)
1474 /* XXX we assume that n->m_next is not a chain */
1475 if (n->m_next->m_next != NULL)
1477 n->m_pkthdr.len += n->m_next->m_len;
1479 case NI_QTYPE_NODEADDR:
1483 nni6->ni_code = ICMP6_NI_SUCCESS;
1484 n->m_pkthdr.len = n->m_len =
1485 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1486 lenlim = M_TRAILINGSPACE(n);
1487 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1488 /* XXX: reset mbuf length */
1489 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1490 sizeof(struct icmp6_nodeinfo) + copied;
1494 break; /* XXX impossible! */
1497 nni6->ni_type = ICMP6_NI_REPLY;
1509 * make a mbuf with DNS-encoded string. no compression support.
1511 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1512 * treated as truncated name (two \0 at the end). this is a wild guess.
1514 * old - return pascal string if non-zero
1516 static struct mbuf *
1517 ni6_nametodns(const char *name, int namelen, int old)
1529 /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
1531 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1533 m = m_get(M_NOWAIT, MT_DATA);
1539 *mtod(m, char *) = namelen;
1540 bcopy(name, mtod(m, char *) + 1, namelen);
1544 cp = mtod(m, char *);
1545 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1547 /* if not certain about my name, return empty buffer */
1552 * guess if it looks like shortened hostname, or FQDN.
1553 * shortened hostname needs two trailing "\0".
1556 for (p = name; p < name + namelen; p++) {
1557 if (*p && *p == '.')
1566 while (cp < ep && p < name + namelen) {
1568 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1570 /* result does not fit into mbuf */
1571 if (cp + i + 1 >= ep)
1574 * DNS label length restriction, RFC1035 page 8.
1575 * "i == 0" case is included here to avoid returning
1576 * 0-length label on "foo..bar".
1578 if (i <= 0 || i >= 64)
1584 if (p < name + namelen && *p == '.')
1588 if (cp + nterm >= ep)
1592 m->m_len = cp - mtod(m, char *);
1596 panic("should not reach here");
1606 * check if two DNS-encoded string matches. takes care of truncated
1607 * form (with \0\0 at the end). no compression support.
1608 * XXX upper/lowercase match (see RFC2065)
1611 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1613 const char *a0, *b0;
1616 /* simplest case - need validation? */
1617 if (alen == blen && bcmp(a, b, alen) == 0)
1623 /* termination is mandatory */
1624 if (alen < 2 || blen < 2)
1626 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1631 while (a - a0 < alen && b - b0 < blen) {
1632 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1635 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1637 /* we don't support compression yet */
1638 if (a[0] >= 64 || b[0] >= 64)
1641 /* truncated case */
1642 if (a[0] == 0 && a - a0 == alen - 1)
1644 if (b[0] == 0 && b - b0 == blen - 1)
1646 if (a[0] == 0 || b[0] == 0)
1652 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1654 if (bcmp(a + 1, b + 1, l) != 0)
1661 if (a - a0 == alen && b - b0 == blen)
1668 * calculate the number of addresses to be returned in the node info reply.
1671 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1672 struct in6_addr *subj)
1675 struct in6_ifaddr *ifa6;
1677 int addrs = 0, addrsofif, iffound = 0;
1678 int niflags = ni6->ni_flags;
1682 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1683 switch (ni6->ni_code) {
1684 case ICMP6_NI_SUBJ_IPV6:
1685 if (subj == NULL) /* must be impossible... */
1690 * XXX: we only support IPv6 subject address for
1697 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1699 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1700 if (ifa->ifa_addr->sa_family != AF_INET6)
1702 ifa6 = (struct in6_ifaddr *)ifa;
1704 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1705 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1709 * IPv4-mapped addresses can only be returned by a
1710 * Node Information proxy, since they represent
1711 * addresses of IPv4-only nodes, which perforce do
1712 * not implement this protocol.
1713 * [icmp-name-lookups-07, Section 5.4]
1714 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1715 * this function at this moment.
1718 /* What do we have to do about ::1? */
1719 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1720 case IPV6_ADDR_SCOPE_LINKLOCAL:
1721 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1724 case IPV6_ADDR_SCOPE_SITELOCAL:
1725 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1728 case IPV6_ADDR_SCOPE_GLOBAL:
1729 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1737 * check if anycast is okay.
1738 * XXX: just experimental. not in the spec.
1740 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1741 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1742 continue; /* we need only unicast addresses */
1743 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1744 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1747 addrsofif++; /* count the address */
1761 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1762 struct ifnet *ifp0, int resid)
1765 struct in6_ifaddr *ifa6;
1767 struct ifnet *ifp_dep = NULL;
1768 int copied = 0, allow_deprecated = 0;
1769 u_char *cp = (u_char *)(nni6 + 1);
1770 int niflags = ni6->ni_flags;
1775 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1776 return (0); /* needless to copy */
1778 ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet);
1781 for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) {
1782 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1783 if (ifa->ifa_addr->sa_family != AF_INET6)
1785 ifa6 = (struct in6_ifaddr *)ifa;
1787 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1788 allow_deprecated == 0) {
1790 * prefererred address should be put before
1791 * deprecated addresses.
1794 /* record the interface for later search */
1795 if (ifp_dep == NULL)
1799 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1800 allow_deprecated != 0)
1801 continue; /* we now collect deprecated addrs */
1803 /* What do we have to do about ::1? */
1804 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1805 case IPV6_ADDR_SCOPE_LINKLOCAL:
1806 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1809 case IPV6_ADDR_SCOPE_SITELOCAL:
1810 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1813 case IPV6_ADDR_SCOPE_GLOBAL:
1814 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1822 * check if anycast is okay.
1823 * XXX: just experimental. not in the spec.
1825 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1826 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1828 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1829 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1833 /* now we can copy the address */
1834 if (resid < sizeof(struct in6_addr) +
1835 sizeof(u_int32_t)) {
1837 * We give up much more copy.
1838 * Set the truncate flag and return.
1840 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1845 * Set the TTL of the address.
1846 * The TTL value should be one of the following
1847 * according to the specification:
1849 * 1. The remaining lifetime of a DHCP lease on the
1851 * 2. The remaining Valid Lifetime of a prefix from
1852 * which the address was derived through Stateless
1853 * Autoconfiguration.
1855 * Note that we currently do not support stateful
1856 * address configuration by DHCPv6, so the former
1857 * case can't happen.
1859 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1860 ltime = ND6_INFINITE_LIFETIME;
1862 if (ifa6->ia6_lifetime.ia6t_expire >
1864 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1869 bcopy(<ime, cp, sizeof(u_int32_t));
1870 cp += sizeof(u_int32_t);
1872 /* copy the address itself */
1873 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1874 sizeof(struct in6_addr));
1875 in6_clearscope((struct in6_addr *)cp); /* XXX */
1876 cp += sizeof(struct in6_addr);
1878 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1879 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1881 if (ifp0) /* we need search only on the specified IF */
1885 if (allow_deprecated == 0 && ifp_dep != NULL) {
1887 allow_deprecated = 1;
1896 icmp6_rip6_match(const struct inpcb *inp, void *v)
1898 struct ip6_hdr *ip6 = v;
1900 if ((inp->inp_vflag & INP_IPV6) == 0)
1902 if (inp->inp_ip_p != IPPROTO_ICMPV6)
1904 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1905 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
1907 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1908 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
1914 * XXX almost dup'ed code with rip6_input.
1917 icmp6_rip6_input(struct mbuf **mp, int off)
1919 struct mbuf *n, *m = *mp;
1920 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1921 struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
1922 INPLOOKUP_RLOCKPCB, icmp6_rip6_match, ip6);
1924 struct sockaddr_in6 fromsa;
1925 struct icmp6_hdr *icmp6;
1926 struct mbuf *opts = NULL;
1929 /* This is assumed to be safe; icmp6_input() does a pullup. */
1930 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1933 * XXX: the address may have embedded scope zone ID, which should be
1934 * hidden from applications.
1936 bzero(&fromsa, sizeof(fromsa));
1937 fromsa.sin6_family = AF_INET6;
1938 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1939 fromsa.sin6_addr = ip6->ip6_src;
1940 if (sa6_recoverscope(&fromsa)) {
1943 return (IPPROTO_DONE);
1946 while ((inp = inp_next(&inpi)) != NULL) {
1947 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1948 inp->in6p_icmp6filt))
1951 * Recent network drivers tend to allocate a single
1952 * mbuf cluster, rather than to make a couple of
1953 * mbufs without clusters. Also, since the IPv6 code
1954 * path tries to avoid m_pullup(), it is highly
1955 * probable that we still have an mbuf cluster here
1956 * even though the necessary length can be stored in an
1957 * mbuf's internal buffer.
1958 * Meanwhile, the default size of the receive socket
1959 * buffer for raw sockets is not so large. This means
1960 * the possibility of packet loss is relatively higher
1961 * than before. To avoid this scenario, we copy the
1962 * received data to a separate mbuf that does not use
1963 * a cluster, if possible.
1964 * XXX: it is better to copy the data after stripping
1965 * intermediate headers.
1967 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1968 m->m_len <= MHLEN) {
1969 n = m_get(M_NOWAIT, m->m_type);
1971 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1972 bcopy(m->m_data, n->m_data, m->m_len);
1973 n->m_len = m->m_len;
1980 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1983 if (inp->inp_flags & INP_CONTROLOPTS)
1984 ip6_savecontrol(inp, n, &opts);
1985 /* strip intermediate headers */
1987 SOCKBUF_LOCK(&inp->inp_socket->so_rcv);
1988 if (sbappendaddr_locked(&inp->inp_socket->so_rcv,
1989 (struct sockaddr *)&fromsa, n, opts) == 0) {
1990 soroverflow_locked(inp->inp_socket);
1995 sorwakeup_locked(inp->inp_socket);
2003 IP6STAT_DEC(ip6s_delivered);
2004 return (IPPROTO_DONE);
2008 * Reflect the ip6 packet back to the source.
2009 * OFF points to the icmp6 header, counted from the top of the mbuf.
2012 icmp6_reflect(struct mbuf *m, size_t off)
2014 struct in6_addr src6, *srcp;
2015 struct ip6_hdr *ip6;
2016 struct icmp6_hdr *icmp6;
2017 struct in6_ifaddr *ia = NULL;
2018 struct ifnet *outif = NULL;
2020 int type, code, hlim;
2022 /* too short to reflect */
2023 if (off < sizeof(struct ip6_hdr)) {
2025 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2026 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2027 __FILE__, __LINE__));
2032 * If there are extra headers between IPv6 and ICMPv6, strip
2033 * off that header first.
2036 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2037 panic("assumption failed in icmp6_reflect");
2039 if (off > sizeof(struct ip6_hdr)) {
2041 struct ip6_hdr nip6;
2043 l = off - sizeof(struct ip6_hdr);
2044 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2046 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2048 if ((m = m_pullup(m, l)) == NULL)
2051 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2052 } else /* off == sizeof(struct ip6_hdr) */ {
2054 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2056 if ((m = m_pullup(m, l)) == NULL)
2060 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2061 ip6 = mtod(m, struct ip6_hdr *);
2062 ip6->ip6_nxt = IPPROTO_ICMPV6;
2063 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2064 type = icmp6->icmp6_type; /* keep type for statistics */
2065 code = icmp6->icmp6_code; /* ditto. */
2070 * If the incoming packet was addressed directly to us (i.e. unicast),
2071 * use dst as the src for the reply.
2072 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2073 * (for example) when we encounter an error while forwarding procedure
2074 * destined to a duplicated address of ours.
2076 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
2077 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
2078 if (ia != NULL && !(ia->ia6_flags &
2079 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2080 src6 = ia->ia_addr.sin6_addr;
2083 if (m->m_pkthdr.rcvif != NULL) {
2084 /* XXX: This may not be the outgoing interface */
2085 hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2087 hlim = V_ip6_defhlim;
2093 struct in6_addr dst6;
2097 * This case matches to multicasts, our anycast, or unicasts
2098 * that we do not own. Select a source address based on the
2099 * source address of the erroneous packet.
2101 in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
2102 error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
2103 scopeid, NULL, &src6, &hlim);
2106 char ip6buf[INET6_ADDRSTRLEN];
2108 "icmp6_reflect: source can't be determined: "
2109 "dst=%s, error=%d\n",
2110 ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
2116 * ip6_input() drops a packet if its src is multicast.
2117 * So, the src is never multicast.
2119 ip6->ip6_dst = ip6->ip6_src;
2120 ip6->ip6_src = *srcp;
2122 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2123 ip6->ip6_vfc |= IPV6_VERSION;
2124 ip6->ip6_nxt = IPPROTO_ICMPV6;
2125 ip6->ip6_hlim = hlim;
2127 icmp6->icmp6_cksum = 0;
2128 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2129 sizeof(struct ip6_hdr), plen);
2132 * XXX option handling
2135 m->m_flags &= ~(M_BCAST|M_MCAST);
2136 m->m_pkthdr.rcvif = NULL;
2137 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2139 icmp6_ifoutstat_inc(outif, type, code);
2149 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2150 struct in6_addr *tgt6)
2152 static char buf[1024];
2153 char ip6bufs[INET6_ADDRSTRLEN];
2154 char ip6bufd[INET6_ADDRSTRLEN];
2155 char ip6buft[INET6_ADDRSTRLEN];
2156 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2157 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2158 ip6_sprintf(ip6buft, tgt6));
2163 icmp6_redirect_input(struct mbuf *m, int off)
2166 struct ip6_hdr *ip6;
2167 struct nd_redirect *nd_rd;
2168 struct in6_addr src6, redtgt6, reddst6;
2169 union nd_opts ndopts;
2170 char ip6buf[INET6_ADDRSTRLEN];
2172 int icmp6len, is_onlink, is_router, lladdrlen;
2175 KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
2177 /* XXX if we are router, we don't update route by icmp6 redirect */
2178 if (V_ip6_forwarding)
2180 if (!V_icmp6_rediraccept)
2183 /* RFC 6980: Nodes MUST silently ignore fragments */
2184 if(m->m_flags & M_FRAGMENTED)
2187 ip6 = mtod(m, struct ip6_hdr *);
2188 icmp6len = ntohs(ip6->ip6_plen);
2189 if (m->m_len < off + icmp6len) {
2190 m = m_pullup(m, off + icmp6len);
2192 IP6STAT_INC(ip6s_exthdrtoolong);
2196 ip6 = mtod(m, struct ip6_hdr *);
2197 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2199 ifp = m->m_pkthdr.rcvif;
2200 redtgt6 = nd_rd->nd_rd_target;
2201 reddst6 = nd_rd->nd_rd_dst;
2203 if (in6_setscope(&redtgt6, ifp, NULL) ||
2204 in6_setscope(&reddst6, ifp, NULL)) {
2209 src6 = ip6->ip6_src;
2210 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2212 "ICMP6 redirect sent from %s rejected; "
2213 "must be from linklocal\n",
2214 ip6_sprintf(ip6buf, &src6)));
2217 if (__predict_false(ip6->ip6_hlim != 255)) {
2218 ICMP6STAT_INC(icp6s_invlhlim);
2220 "ICMP6 redirect sent from %s rejected; "
2221 "hlim=%d (must be 255)\n",
2222 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2226 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2227 struct nhop_object *nh;
2228 struct in6_addr kdst;
2231 in6_splitscope(&reddst6, &kdst, &scopeid);
2233 nh = fib6_lookup(ifp->if_fib, &kdst, scopeid, 0, 0);
2235 struct in6_addr nh_addr;
2236 nh_addr = ifatoia6(nh->nh_ifa)->ia_addr.sin6_addr;
2237 if ((nh->nh_flags & NHF_GATEWAY) == 0) {
2239 "ICMP6 redirect rejected; no route "
2240 "with inet6 gateway found for redirect dst: %s\n",
2241 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2246 * Embed scope zone id into next hop address.
2248 nh_addr = nh->gw6_sa.sin6_addr;
2250 if (IN6_ARE_ADDR_EQUAL(&src6, &nh_addr) == 0) {
2252 "ICMP6 redirect rejected; "
2253 "not equal to gw-for-src=%s (must be same): "
2255 ip6_sprintf(ip6buf, &nh_addr),
2256 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2261 "ICMP6 redirect rejected; "
2262 "no route found for redirect dst: %s\n",
2263 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2267 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2269 "ICMP6 redirect rejected; "
2270 "redirect dst must be unicast: %s\n",
2271 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2275 is_router = is_onlink = 0;
2276 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2277 is_router = 1; /* router case */
2278 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2279 is_onlink = 1; /* on-link destination case */
2280 if (!is_router && !is_onlink) {
2282 "ICMP6 redirect rejected; "
2283 "neither router case nor onlink case: %s\n",
2284 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2288 icmp6len -= sizeof(*nd_rd);
2289 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2290 if (nd6_options(&ndopts) < 0) {
2291 nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
2292 __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2293 /* nd6_options have incremented stats */
2299 if (ndopts.nd_opts_tgt_lladdr) {
2300 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2301 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2304 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2305 nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
2306 "(if %d, icmp6 packet %d): %s\n",
2307 __func__, ip6_sprintf(ip6buf, &redtgt6),
2308 ifp->if_addrlen, lladdrlen - 2,
2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2313 /* Validation passed. */
2316 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2317 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2320 * Install a gateway route in the better-router case or an interface
2321 * route in the on-link-destination case.
2324 struct sockaddr_in6 sdst;
2325 struct sockaddr_in6 sgw;
2326 struct sockaddr_in6 ssrc;
2327 struct sockaddr *gw;
2331 bzero(&sdst, sizeof(sdst));
2332 bzero(&ssrc, sizeof(ssrc));
2333 sdst.sin6_family = ssrc.sin6_family = AF_INET6;
2334 sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
2335 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2336 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2339 bzero(&sgw, sizeof(sgw));
2340 sgw.sin6_family = AF_INET6;
2341 sgw.sin6_len = sizeof(struct sockaddr_in6);
2342 bcopy(&redtgt6, &sgw.sin6_addr,
2343 sizeof(struct in6_addr));
2344 gw = (struct sockaddr *)&sgw;
2345 rt_flags |= RTF_GATEWAY;
2347 gw = ifp->if_addr->ifa_addr;
2348 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
2349 rib_add_redirect(fibnum, (struct sockaddr *)&sdst, gw,
2350 (struct sockaddr *)&ssrc, ifp, rt_flags,
2351 V_icmp6_redirtimeout);
2359 ICMP6STAT_INC(icp6s_badredirect);
2364 icmp6_redirect_output(struct mbuf *m0, struct nhop_object *nh)
2366 struct ifnet *ifp; /* my outgoing interface */
2367 struct in6_addr *ifp_ll6;
2368 struct in6_addr *router_ll6;
2369 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2370 struct mbuf *m = NULL; /* newly allocated one */
2372 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2373 struct nd_redirect *nd_rd;
2374 struct llentry *ln = NULL;
2377 struct ifnet *outif = NULL;
2378 struct sockaddr_in6 src_sa;
2380 icmp6_errcount(ND_REDIRECT, 0);
2382 /* if we are not router, we don't send icmp6 redirect */
2383 if (!V_ip6_forwarding)
2387 if (!m0 || !nh || !(NH_IS_VALID(nh)) || !(ifp = nh->nh_ifp))
2392 * the source address must identify a neighbor, and
2393 * the destination address must not be a multicast address
2394 * [RFC 2461, sec 8.2]
2396 sip6 = mtod(m0, struct ip6_hdr *);
2397 bzero(&src_sa, sizeof(src_sa));
2398 src_sa.sin6_family = AF_INET6;
2399 src_sa.sin6_len = sizeof(src_sa);
2400 src_sa.sin6_addr = sip6->ip6_src;
2401 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2403 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2404 goto fail; /* what should we do here? */
2407 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2411 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2412 * we almost always ask for an mbuf cluster for simplicity.
2413 * (MHLEN < IPV6_MMTU is almost always true)
2415 #if IPV6_MMTU >= MCLBYTES
2416 # error assumption failed about IPV6_MMTU and MCLBYTES
2418 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2421 M_SETFIB(m, M_GETFIB(m0));
2422 maxlen = M_TRAILINGSPACE(m);
2423 maxlen = min(IPV6_MMTU, maxlen);
2424 /* just for safety */
2425 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2426 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2431 /* get ip6 linklocal address for ifp(my outgoing interface). */
2432 struct in6_ifaddr *ia;
2433 if ((ia = in6ifa_ifpforlinklocal(ifp,
2435 IN6_IFF_ANYCAST)) == NULL)
2437 ifp_ll6 = &ia->ia_addr.sin6_addr;
2438 /* XXXRW: reference released prematurely. */
2439 ifa_free(&ia->ia_ifa);
2442 /* get ip6 linklocal address for the router. */
2443 if (nh->nh_flags & NHF_GATEWAY) {
2444 struct sockaddr_in6 *sin6;
2446 router_ll6 = &sin6->sin6_addr;
2447 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2448 router_ll6 = (struct in6_addr *)NULL;
2450 router_ll6 = (struct in6_addr *)NULL;
2453 ip6 = mtod(m, struct ip6_hdr *);
2455 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2456 ip6->ip6_vfc |= IPV6_VERSION;
2457 /* ip6->ip6_plen will be set later */
2458 ip6->ip6_nxt = IPPROTO_ICMPV6;
2459 ip6->ip6_hlim = 255;
2460 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2461 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2462 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2465 nd_rd = (struct nd_redirect *)(ip6 + 1);
2466 nd_rd->nd_rd_type = ND_REDIRECT;
2467 nd_rd->nd_rd_code = 0;
2468 nd_rd->nd_rd_reserved = 0;
2469 if (nh->nh_flags & NHF_GATEWAY) {
2471 * nd_rd->nd_rd_target must be a link-local address in
2472 * better router cases.
2476 bcopy(router_ll6, &nd_rd->nd_rd_target,
2477 sizeof(nd_rd->nd_rd_target));
2478 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2479 sizeof(nd_rd->nd_rd_dst));
2481 /* make sure redtgt == reddst */
2482 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2483 sizeof(nd_rd->nd_rd_target));
2484 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2485 sizeof(nd_rd->nd_rd_dst));
2488 p = (u_char *)(nd_rd + 1);
2494 /* target lladdr option */
2496 struct nd_opt_hdr *nd_opt;
2499 ln = nd6_lookup(router_ll6, LLE_SF(AF_INET6, 0), ifp);
2503 len = sizeof(*nd_opt) + ifp->if_addrlen;
2504 len = (len + 7) & ~7; /* round by 8 */
2506 if (len + (p - (u_char *)ip6) > maxlen)
2509 if (ln->la_flags & LLE_VALID) {
2510 nd_opt = (struct nd_opt_hdr *)p;
2511 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2512 nd_opt->nd_opt_len = len >> 3;
2513 lladdr = (char *)(nd_opt + 1);
2514 bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
2522 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2524 /* just to be safe */
2525 #ifdef M_DECRYPTED /*not openbsd*/
2526 if (m0->m_flags & M_DECRYPTED)
2529 if (p - (u_char *)ip6 > maxlen)
2533 /* redirected header option */
2535 struct nd_opt_rd_hdr *nd_opt_rh;
2538 * compute the maximum size for icmp6 redirect header option.
2539 * XXX room for auth header?
2541 len = maxlen - (p - (u_char *)ip6);
2544 /* This is just for simplicity. */
2545 if (m0->m_pkthdr.len != m0->m_len) {
2547 m_freem(m0->m_next);
2550 m0->m_pkthdr.len = m0->m_len;
2554 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2555 * about padding/truncate rule for the original IP packet.
2556 * From the discussion on IPv6imp in Feb 1999,
2557 * the consensus was:
2558 * - "attach as much as possible" is the goal
2559 * - pad if not aligned (original size can be guessed by
2560 * original ip6 header)
2561 * Following code adds the padding if it is simple enough,
2562 * and truncates if not.
2564 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2565 panic("assumption failed in %s:%d", __FILE__,
2568 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2569 /* not enough room, truncate */
2570 m0->m_pkthdr.len = m0->m_len = len -
2573 /* enough room, pad or truncate */
2576 extra = m0->m_pkthdr.len % 8;
2578 /* pad if easy enough, truncate if not */
2579 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2581 m0->m_len += (8 - extra);
2582 m0->m_pkthdr.len += (8 - extra);
2585 m0->m_pkthdr.len -= extra;
2589 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2590 m0->m_pkthdr.len = m0->m_len = len -
2594 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2595 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2596 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2597 nd_opt_rh->nd_opt_rh_len = len >> 3;
2598 p += sizeof(*nd_opt_rh);
2599 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2601 /* connect m0 to m */
2602 m_tag_delete_chain(m0, NULL);
2603 m0->m_flags &= ~M_PKTHDR;
2605 m->m_pkthdr.len = m->m_len + m0->m_len;
2614 /* XXX: clear embedded link IDs in the inner header */
2615 in6_clearscope(&sip6->ip6_src);
2616 in6_clearscope(&sip6->ip6_dst);
2617 in6_clearscope(&nd_rd->nd_rd_target);
2618 in6_clearscope(&nd_rd->nd_rd_dst);
2620 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2622 nd_rd->nd_rd_cksum = 0;
2623 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2624 sizeof(*ip6), ntohs(ip6->ip6_plen));
2626 if (send_sendso_input_hook != NULL) {
2627 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
2631 *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
2632 m_tag_prepend(m, mtag);
2635 /* send the packet to outside... */
2636 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2638 icmp6_ifstat_inc(outif, ifs6_out_msg);
2639 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2641 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2653 * ICMPv6 socket option processing.
2656 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2660 struct inpcb *inp = sotoinpcb(so);
2661 int level, op, optname;
2664 level = sopt->sopt_level;
2665 op = sopt->sopt_dir;
2666 optname = sopt->sopt_name;
2667 optlen = sopt->sopt_valsize;
2669 level = op = optname = optlen = 0;
2671 if (level != IPPROTO_ICMPV6) {
2680 struct icmp6_filter ic6f;
2682 if (optlen != sizeof(ic6f)) {
2686 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2689 *inp->in6p_icmp6filt = ic6f;
2696 error = ENOPROTOOPT;
2705 struct icmp6_filter ic6f;
2708 ic6f = *inp->in6p_icmp6filt;
2710 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2715 error = ENOPROTOOPT;
2725 * Perform rate limit check.
2726 * Returns 0 if it is okay to send the icmp6 packet.
2727 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2730 * XXX per-destination/type check necessary?
2732 * dst - not used at this moment
2733 * type - not used at this moment
2734 * code - not used at this moment
2737 icmp6_ratelimit(const struct in6_addr *dst, const int type,
2742 ret = 0; /* okay to send */
2745 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2746 V_icmp6errppslim)) {
2747 /* The packet is subject to rate limit */