2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
69 #include <sys/param.h>
70 #include <sys/domain.h>
72 #include <sys/kernel.h>
74 #include <sys/malloc.h>
77 #include <sys/protosw.h>
78 #include <sys/signalvar.h>
79 #include <sys/socket.h>
80 #include <sys/socketvar.h>
82 #include <sys/syslog.h>
83 #include <sys/systm.h>
87 #include <net/if_dl.h>
88 #include <net/if_llatbl.h>
89 #include <net/if_types.h>
90 #include <net/route.h>
93 #include <netinet/in.h>
94 #include <netinet/in_pcb.h>
95 #include <netinet/in_var.h>
96 #include <netinet/ip6.h>
97 #include <netinet/icmp6.h>
98 #include <netinet/tcp_var.h>
100 #include <netinet6/in6_ifattach.h>
101 #include <netinet6/in6_pcb.h>
102 #include <netinet6/ip6protosw.h>
103 #include <netinet6/ip6_var.h>
104 #include <netinet6/scope6_var.h>
105 #include <netinet6/mld6_var.h>
106 #include <netinet6/nd6.h>
107 #include <netinet6/send.h>
109 extern struct domain inet6domain;
111 VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
112 VNET_PCPUSTAT_SYSINIT(icmp6stat);
115 VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
118 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
119 VNET_DECLARE(struct inpcbhead, ripcb);
120 VNET_DECLARE(int, icmp6errppslim);
121 static VNET_DEFINE(int, icmp6errpps_count) = 0;
122 static VNET_DEFINE(struct timeval, icmp6errppslim_last);
123 VNET_DECLARE(int, icmp6_nodeinfo);
125 #define V_ripcbinfo VNET(ripcbinfo)
126 #define V_ripcb VNET(ripcb)
127 #define V_icmp6errppslim VNET(icmp6errppslim)
128 #define V_icmp6errpps_count VNET(icmp6errpps_count)
129 #define V_icmp6errppslim_last VNET(icmp6errppslim_last)
130 #define V_icmp6_nodeinfo VNET(icmp6_nodeinfo)
132 static void icmp6_errcount(int, int);
133 static int icmp6_rip6_input(struct mbuf **, int);
134 static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
135 static const char *icmp6_redirect_diag(struct in6_addr *,
136 struct in6_addr *, struct in6_addr *);
137 static struct mbuf *ni6_input(struct mbuf *, int);
138 static struct mbuf *ni6_nametodns(const char *, int, int);
139 static int ni6_dnsmatch(const char *, int, const char *, int);
140 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
141 struct ifnet **, struct in6_addr *);
142 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
143 struct ifnet *, int);
144 static int icmp6_notify_error(struct mbuf **, int, int, int);
147 * Kernel module interface for updating icmp6stat. The argument is an index
148 * into icmp6stat treated as an array of u_quad_t. While this encodes the
149 * general layout of icmp6stat into the caller, it doesn't encode its
150 * location, so that future changes to add, for example, per-CPU stats
151 * support won't cause binary compatibility problems for kernel modules.
154 kmod_icmp6stat_inc(int statnum)
157 counter_u64_add(VNET(icmp6stat)[statnum], 1);
161 icmp6_errcount(int type, int code)
164 case ICMP6_DST_UNREACH:
166 case ICMP6_DST_UNREACH_NOROUTE:
167 ICMP6STAT_INC(icp6s_odst_unreach_noroute);
169 case ICMP6_DST_UNREACH_ADMIN:
170 ICMP6STAT_INC(icp6s_odst_unreach_admin);
172 case ICMP6_DST_UNREACH_BEYONDSCOPE:
173 ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
175 case ICMP6_DST_UNREACH_ADDR:
176 ICMP6STAT_INC(icp6s_odst_unreach_addr);
178 case ICMP6_DST_UNREACH_NOPORT:
179 ICMP6STAT_INC(icp6s_odst_unreach_noport);
183 case ICMP6_PACKET_TOO_BIG:
184 ICMP6STAT_INC(icp6s_opacket_too_big);
186 case ICMP6_TIME_EXCEEDED:
188 case ICMP6_TIME_EXCEED_TRANSIT:
189 ICMP6STAT_INC(icp6s_otime_exceed_transit);
191 case ICMP6_TIME_EXCEED_REASSEMBLY:
192 ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
196 case ICMP6_PARAM_PROB:
198 case ICMP6_PARAMPROB_HEADER:
199 ICMP6STAT_INC(icp6s_oparamprob_header);
201 case ICMP6_PARAMPROB_NEXTHEADER:
202 ICMP6STAT_INC(icp6s_oparamprob_nextheader);
204 case ICMP6_PARAMPROB_OPTION:
205 ICMP6STAT_INC(icp6s_oparamprob_option);
210 ICMP6STAT_INC(icp6s_oredirect);
213 ICMP6STAT_INC(icp6s_ounknown);
217 * A wrapper function for icmp6_error() necessary when the erroneous packet
218 * may not contain enough scope zone information.
221 icmp6_error2(struct mbuf *m, int type, int code, int param,
229 #ifndef PULLDOWN_TEST
230 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
232 if (m->m_len < sizeof(struct ip6_hdr)) {
233 m = m_pullup(m, sizeof(struct ip6_hdr));
239 ip6 = mtod(m, struct ip6_hdr *);
241 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
243 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
246 icmp6_error(m, type, code, param);
250 * Generate an error packet of type error in response to bad IP6 packet.
253 icmp6_error(struct mbuf *m, int type, int code, int param)
255 struct ip6_hdr *oip6, *nip6;
256 struct icmp6_hdr *icmp6;
261 ICMP6STAT_INC(icp6s_error);
263 /* count per-type-code statistics */
264 icmp6_errcount(type, code);
266 #ifdef M_DECRYPTED /*not openbsd*/
267 if (m->m_flags & M_DECRYPTED) {
268 ICMP6STAT_INC(icp6s_canterror);
273 #ifndef PULLDOWN_TEST
274 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
276 if (m->m_len < sizeof(struct ip6_hdr)) {
277 m = m_pullup(m, sizeof(struct ip6_hdr));
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 #ifndef PULLDOWN_TEST
320 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
321 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
323 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
326 ICMP6STAT_INC(icp6s_tooshort);
330 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
331 icp->icmp6_type == ND_REDIRECT) {
334 * Special case: for redirect (which is
335 * informational) we must not send icmp6 error.
337 ICMP6STAT_INC(icp6s_canterror);
340 /* ICMPv6 informational - send the error */
343 /* non-ICMPv6 - send the error */
346 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
348 /* Finally, do rate limitation check. */
349 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
350 ICMP6STAT_INC(icp6s_toofreq);
355 * OK, ICMP6 can be generated.
358 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
359 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
361 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
362 M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */
364 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
368 nip6 = mtod(m, struct ip6_hdr *);
369 nip6->ip6_src = oip6->ip6_src;
370 nip6->ip6_dst = oip6->ip6_dst;
372 in6_clearscope(&oip6->ip6_src);
373 in6_clearscope(&oip6->ip6_dst);
375 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
376 icmp6->icmp6_type = type;
377 icmp6->icmp6_code = code;
378 icmp6->icmp6_pptr = htonl((u_int32_t)param);
381 * icmp6_reflect() is designed to be in the input path.
382 * icmp6_error() can be called from both input and output path,
383 * and if we are in output path rcvif could contain bogus value.
384 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
385 * information in ip header (nip6).
387 m->m_pkthdr.rcvif = NULL;
389 ICMP6STAT_INC(icp6s_outhist[type]);
390 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
396 * If we can't tell whether or not we can generate ICMP6, free it.
402 * Process a received ICMP6 message.
405 icmp6_input(struct mbuf **mp, int *offp, int proto)
407 struct mbuf *m = *mp, *n;
409 struct ip6_hdr *ip6, *nip6;
410 struct icmp6_hdr *icmp6, *nicmp6;
412 int icmp6len = m->m_pkthdr.len - *offp;
414 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
417 ifp = m->m_pkthdr.rcvif;
419 #ifndef PULLDOWN_TEST
420 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
421 /* m might change if M_LOOP. So, call mtod after this */
425 * Locate icmp6 structure in mbuf, and check
426 * that not corrupted and of at least minimum length
429 ip6 = mtod(m, struct ip6_hdr *);
430 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
431 if (icmp6len < sizeof(struct icmp6_hdr)) {
432 ICMP6STAT_INC(icp6s_tooshort);
437 * Check multicast group membership.
438 * Note: SSM filters are not applied for ICMPv6 traffic.
440 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
441 struct in6_multi *inm;
443 inm = in6m_lookup(ifp, &ip6->ip6_dst);
445 IP6STAT_INC(ip6s_notmember);
446 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
452 * calculate the checksum
454 #ifndef PULLDOWN_TEST
455 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
457 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
459 ICMP6STAT_INC(icp6s_tooshort);
463 code = icmp6->icmp6_code;
465 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
467 "ICMP6 checksum error(%d|%x) %s\n",
468 icmp6->icmp6_type, sum,
469 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
470 ICMP6STAT_INC(icp6s_checksum);
474 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
476 * Deliver very specific ICMP6 type only.
477 * This is important to deliver TOOBIG. Otherwise PMTUD
480 switch (icmp6->icmp6_type) {
481 case ICMP6_DST_UNREACH:
482 case ICMP6_PACKET_TOO_BIG:
483 case ICMP6_TIME_EXCEEDED:
490 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
491 icmp6_ifstat_inc(ifp, ifs6_in_msg);
492 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
493 icmp6_ifstat_inc(ifp, ifs6_in_error);
495 switch (icmp6->icmp6_type) {
496 case ICMP6_DST_UNREACH:
497 icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
499 case ICMP6_DST_UNREACH_NOROUTE:
500 code = PRC_UNREACH_NET;
502 case ICMP6_DST_UNREACH_ADMIN:
503 icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
504 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
506 case ICMP6_DST_UNREACH_ADDR:
509 case ICMP6_DST_UNREACH_BEYONDSCOPE:
510 /* I mean "source address was incorrect." */
511 code = PRC_PARAMPROB;
513 case ICMP6_DST_UNREACH_NOPORT:
514 code = PRC_UNREACH_PORT;
522 case ICMP6_PACKET_TOO_BIG:
523 icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
525 /* validation is made in icmp6_mtudisc_update */
530 * Updating the path MTU will be done after examining
531 * intermediate extension headers.
536 case ICMP6_TIME_EXCEEDED:
537 icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
539 case ICMP6_TIME_EXCEED_TRANSIT:
540 code = PRC_TIMXCEED_INTRANS;
542 case ICMP6_TIME_EXCEED_REASSEMBLY:
543 code = PRC_TIMXCEED_REASS;
551 case ICMP6_PARAM_PROB:
552 icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
554 case ICMP6_PARAMPROB_NEXTHEADER:
555 code = PRC_UNREACH_PROTOCOL;
557 case ICMP6_PARAMPROB_HEADER:
558 case ICMP6_PARAMPROB_OPTION:
559 code = PRC_PARAMPROB;
567 case ICMP6_ECHO_REQUEST:
568 icmp6_ifstat_inc(ifp, ifs6_in_echo);
571 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
575 if ((n->m_flags & M_EXT) != 0
576 || n->m_len < off + sizeof(struct icmp6_hdr)) {
580 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
581 n = m_gethdr(M_NOWAIT, n0->m_type);
588 m_move_pkthdr(n, n0); /* FIB copied. */
589 n0len = n0->m_pkthdr.len; /* save for use below */
591 * Copy IPv6 and ICMPv6 only.
593 nip6 = mtod(n, struct ip6_hdr *);
594 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
595 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
596 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
597 noff = sizeof(struct ip6_hdr);
598 /* new mbuf contains only ipv6+icmpv6 headers */
599 n->m_len = noff + sizeof(struct icmp6_hdr);
601 * Adjust mbuf. ip6_plen will be adjusted in
604 m_adj(n0, off + sizeof(struct icmp6_hdr));
605 /* recalculate complete packet size */
606 n->m_pkthdr.len = n0len + (noff - off);
609 nip6 = mtod(n, struct ip6_hdr *);
610 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
614 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
615 nicmp6->icmp6_code = 0;
617 ICMP6STAT_INC(icp6s_reflect);
618 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
619 icmp6_reflect(n, noff);
623 case ICMP6_ECHO_REPLY:
624 icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
629 case MLD_LISTENER_QUERY:
630 case MLD_LISTENER_REPORT:
631 case MLD_LISTENER_DONE:
632 case MLDV2_LISTENER_REPORT:
634 * Drop MLD traffic which is not link-local, has a hop limit
635 * of greater than 1 hop, or which does not have the
636 * IPv6 HBH Router Alert option.
637 * As IPv6 HBH options are stripped in ip6_input() we must
638 * check an mbuf header flag.
639 * XXX Should we also sanity check that these messages
640 * were directed to a link-local multicast prefix?
642 if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
644 if (mld_input(m, off, icmp6len) != 0)
645 return (IPPROTO_DONE);
649 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
651 enum { WRU, FQDN } mode;
653 if (!V_icmp6_nodeinfo)
656 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
658 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
664 #ifndef PULLDOWN_TEST
665 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
668 n = m_copy(m, 0, M_COPYALL);
670 n = ni6_input(n, off);
671 /* XXX meaningless if n == NULL */
672 noff = sizeof(struct ip6_hdr);
679 * XXX: this combination of flags is pointless,
680 * but should we keep this for compatibility?
682 if ((V_icmp6_nodeinfo & 5) != 5)
688 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
689 n = m_gethdr(M_NOWAIT, m->m_type);
694 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
696 * Previous code did a blind M_COPY_PKTHDR
697 * and said "just for rcvif". If true, then
698 * we could tolerate the dup failing (due to
699 * the deep copy of the tag chain). For now
700 * be conservative and just fail.
705 maxhlen = M_TRAILINGSPACE(n) -
706 (sizeof(*nip6) + sizeof(*nicmp6) + 4);
707 pr = curthread->td_ucred->cr_prison;
708 mtx_lock(&pr->pr_mtx);
709 hlen = strlen(pr->pr_hostname);
713 * Copy IPv6 and ICMPv6 only.
715 nip6 = mtod(n, struct ip6_hdr *);
716 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
717 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
718 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
719 p = (u_char *)(nicmp6 + 1);
721 /* meaningless TTL */
722 bcopy(pr->pr_hostname, p + 4, maxhlen);
723 mtx_unlock(&pr->pr_mtx);
724 noff = sizeof(struct ip6_hdr);
725 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
726 sizeof(struct icmp6_hdr) + 4 + maxhlen;
727 nicmp6->icmp6_type = ICMP6_WRUREPLY;
728 nicmp6->icmp6_code = 0;
731 ICMP6STAT_INC(icp6s_reflect);
732 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
733 icmp6_reflect(n, noff);
743 case ND_ROUTER_SOLICIT:
744 icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
747 if (icmp6len < sizeof(struct nd_router_solicit))
749 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
752 /* Send incoming SeND packet to user space. */
753 if (send_sendso_input_hook != NULL) {
754 IP6_EXTHDR_CHECK(m, off,
755 icmp6len, IPPROTO_DONE);
756 error = send_sendso_input_hook(m, ifp,
758 /* -1 == no app on SEND socket */
760 return (IPPROTO_DONE);
761 nd6_rs_input(m, off, icmp6len);
763 nd6_rs_input(m, off, icmp6len);
767 if (send_sendso_input_hook != NULL) {
768 IP6_EXTHDR_CHECK(n, off,
769 icmp6len, IPPROTO_DONE);
770 error = send_sendso_input_hook(n, ifp,
774 /* -1 == no app on SEND socket */
775 nd6_rs_input(n, off, icmp6len);
777 nd6_rs_input(n, off, icmp6len);
781 case ND_ROUTER_ADVERT:
782 icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
785 if (icmp6len < sizeof(struct nd_router_advert))
787 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
789 /* Send incoming SeND-protected/ND packet to user space. */
790 if (send_sendso_input_hook != NULL) {
791 error = send_sendso_input_hook(m, ifp,
794 return (IPPROTO_DONE);
795 nd6_ra_input(m, off, icmp6len);
797 nd6_ra_input(m, off, icmp6len);
801 if (send_sendso_input_hook != NULL) {
802 error = send_sendso_input_hook(n, ifp,
806 nd6_ra_input(n, off, icmp6len);
808 nd6_ra_input(n, off, icmp6len);
812 case ND_NEIGHBOR_SOLICIT:
813 icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
816 if (icmp6len < sizeof(struct nd_neighbor_solicit))
818 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
819 if (send_sendso_input_hook != NULL) {
820 error = send_sendso_input_hook(m, ifp,
823 return (IPPROTO_DONE);
824 nd6_ns_input(m, off, icmp6len);
826 nd6_ns_input(m, off, icmp6len);
830 if (send_sendso_input_hook != NULL) {
831 error = send_sendso_input_hook(n, ifp,
835 nd6_ns_input(n, off, icmp6len);
837 nd6_ns_input(n, off, icmp6len);
841 case ND_NEIGHBOR_ADVERT:
842 icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
845 if (icmp6len < sizeof(struct nd_neighbor_advert))
847 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
849 /* Send incoming SeND-protected/ND packet to user space. */
850 if (send_sendso_input_hook != NULL) {
851 error = send_sendso_input_hook(m, ifp,
854 return (IPPROTO_DONE);
855 nd6_na_input(m, off, icmp6len);
857 nd6_na_input(m, off, icmp6len);
861 if (send_sendso_input_hook != NULL) {
862 error = send_sendso_input_hook(n, ifp,
866 nd6_na_input(n, off, icmp6len);
868 nd6_na_input(n, off, icmp6len);
873 icmp6_ifstat_inc(ifp, ifs6_in_redirect);
876 if (icmp6len < sizeof(struct nd_redirect))
878 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
879 if (send_sendso_input_hook != NULL) {
880 error = send_sendso_input_hook(m, ifp,
883 return (IPPROTO_DONE);
884 icmp6_redirect_input(m, off);
886 icmp6_redirect_input(m, off);
890 if (send_sendso_input_hook != NULL) {
891 error = send_sendso_input_hook(n, ifp,
895 icmp6_redirect_input(n, off);
897 icmp6_redirect_input(n, off);
901 case ICMP6_ROUTER_RENUMBERING:
902 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
903 code != ICMP6_ROUTER_RENUMBERING_RESULT)
905 if (icmp6len < sizeof(struct icmp6_router_renum))
911 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
912 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
913 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
914 ifp ? ifp->if_index : 0));
915 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
916 /* ICMPv6 error: MUST deliver it by spec... */
920 /* ICMPv6 informational: MUST not deliver */
924 if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
925 /* In this case, m should've been freed. */
926 return (IPPROTO_DONE);
931 ICMP6STAT_INC(icp6s_badcode);
935 ICMP6STAT_INC(icp6s_badlen);
939 /* deliver the packet to appropriate sockets */
940 icmp6_rip6_input(&m, *offp);
950 icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
952 struct mbuf *m = *mp;
953 struct icmp6_hdr *icmp6;
954 struct ip6_hdr *eip6;
956 struct sockaddr_in6 icmp6src, icmp6dst;
958 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
959 ICMP6STAT_INC(icp6s_tooshort);
962 #ifndef PULLDOWN_TEST
963 IP6_EXTHDR_CHECK(m, off,
964 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
965 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
967 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
968 sizeof(*icmp6) + sizeof(struct ip6_hdr));
970 ICMP6STAT_INC(icp6s_tooshort);
974 eip6 = (struct ip6_hdr *)(icmp6 + 1);
976 /* Detect the upper level protocol */
978 void (*ctlfunc)(int, struct sockaddr *, void *);
979 u_int8_t nxt = eip6->ip6_nxt;
980 int eoff = off + sizeof(struct icmp6_hdr) +
981 sizeof(struct ip6_hdr);
982 struct ip6ctlparam ip6cp;
983 struct in6_addr *finaldst = NULL;
984 int icmp6type = icmp6->icmp6_type;
986 struct ip6_rthdr *rth;
987 struct ip6_rthdr0 *rth0;
990 while (1) { /* XXX: should avoid infinite loop explicitly? */
994 case IPPROTO_HOPOPTS:
995 case IPPROTO_DSTOPTS:
997 #ifndef PULLDOWN_TEST
998 IP6_EXTHDR_CHECK(m, 0,
999 eoff + sizeof(struct ip6_ext), -1);
1000 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
1002 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
1005 ICMP6STAT_INC(icp6s_tooshort);
1010 if (nxt == IPPROTO_AH)
1011 eoff += (eh->ip6e_len + 2) << 2;
1013 eoff += (eh->ip6e_len + 1) << 3;
1016 case IPPROTO_ROUTING:
1018 * When the erroneous packet contains a
1019 * routing header, we should examine the
1020 * header to determine the final destination.
1021 * Otherwise, we can't properly update
1022 * information that depends on the final
1023 * destination (e.g. path MTU).
1025 #ifndef PULLDOWN_TEST
1026 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
1027 rth = (struct ip6_rthdr *)
1028 (mtod(m, caddr_t) + eoff);
1030 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
1031 eoff, sizeof(*rth));
1033 ICMP6STAT_INC(icp6s_tooshort);
1037 rthlen = (rth->ip6r_len + 1) << 3;
1039 * XXX: currently there is no
1040 * officially defined type other
1042 * Note that if the segment left field
1043 * is 0, all intermediate hops must
1046 if (rth->ip6r_segleft &&
1047 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1050 #ifndef PULLDOWN_TEST
1051 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
1052 rth0 = (struct ip6_rthdr0 *)
1053 (mtod(m, caddr_t) + eoff);
1055 IP6_EXTHDR_GET(rth0,
1056 struct ip6_rthdr0 *, m,
1059 ICMP6STAT_INC(icp6s_tooshort);
1063 /* just ignore a bogus header */
1064 if ((rth0->ip6r0_len % 2) == 0 &&
1065 (hops = rth0->ip6r0_len/2))
1066 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1069 nxt = rth->ip6r_nxt;
1071 case IPPROTO_FRAGMENT:
1072 #ifndef PULLDOWN_TEST
1073 IP6_EXTHDR_CHECK(m, 0, eoff +
1074 sizeof(struct ip6_frag), -1);
1075 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1078 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1081 ICMP6STAT_INC(icp6s_tooshort);
1086 * Data after a fragment header is meaningless
1087 * unless it is the first fragment, but
1088 * we'll go to the notify label for path MTU
1091 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1094 eoff += sizeof(struct ip6_frag);
1099 * This case includes ESP and the No Next
1100 * Header. In such cases going to the notify
1101 * label does not have any meaning
1102 * (i.e. ctlfunc will be NULL), but we go
1103 * anyway since we might have to update
1104 * path MTU information.
1110 #ifndef PULLDOWN_TEST
1111 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1113 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1114 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1115 if (icmp6 == NULL) {
1116 ICMP6STAT_INC(icp6s_tooshort);
1122 * retrieve parameters from the inner IPv6 header, and convert
1123 * them into sockaddr structures.
1124 * XXX: there is no guarantee that the source or destination
1125 * addresses of the inner packet are in the same scope as
1126 * the addresses of the icmp packet. But there is no other
1127 * way to determine the zone.
1129 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1131 bzero(&icmp6dst, sizeof(icmp6dst));
1132 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1133 icmp6dst.sin6_family = AF_INET6;
1134 if (finaldst == NULL)
1135 icmp6dst.sin6_addr = eip6->ip6_dst;
1137 icmp6dst.sin6_addr = *finaldst;
1138 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1140 bzero(&icmp6src, sizeof(icmp6src));
1141 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1142 icmp6src.sin6_family = AF_INET6;
1143 icmp6src.sin6_addr = eip6->ip6_src;
1144 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1146 icmp6src.sin6_flowinfo =
1147 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1149 if (finaldst == NULL)
1150 finaldst = &eip6->ip6_dst;
1152 ip6cp.ip6c_icmp6 = icmp6;
1153 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1154 ip6cp.ip6c_off = eoff;
1155 ip6cp.ip6c_finaldst = finaldst;
1156 ip6cp.ip6c_src = &icmp6src;
1157 ip6cp.ip6c_nxt = nxt;
1159 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1160 notifymtu = ntohl(icmp6->icmp6_mtu);
1161 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1162 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1165 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1166 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1168 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1181 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1183 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1184 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1185 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1186 u_int mtu = ntohl(icmp6->icmp6_mtu);
1187 struct in_conninfo inc;
1191 * RFC2460 section 5, last paragraph.
1192 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1193 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1194 * due to packet translator in the middle.
1195 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1198 if (mtu < IPV6_MMTU)
1203 * we reject ICMPv6 too big with abnormally small value.
1204 * XXX what is the good definition of "abnormally small"?
1206 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1213 * In case the suggested mtu is less than IPV6_MMTU, we
1214 * only need to remember that it was for above mentioned
1215 * "alwaysfrag" case.
1216 * Try to be as close to the spec as possible.
1218 if (mtu < IPV6_MMTU)
1219 mtu = IPV6_MMTU - 8;
1221 bzero(&inc, sizeof(inc));
1222 inc.inc_fibnum = M_GETFIB(m);
1223 inc.inc_flags |= INC_ISIPV6;
1224 inc.inc6_faddr = *dst;
1225 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1228 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1229 tcp_hc_updatemtu(&inc, mtu);
1230 ICMP6STAT_INC(icp6s_pmtuchg);
1235 * Process a Node Information Query packet, based on
1236 * draft-ietf-ipngwg-icmp-name-lookups-07.
1238 * Spec incompatibilities:
1239 * - IPv6 Subject address handling
1240 * - IPv4 Subject address handling support missing
1241 * - Proxy reply (answer even if it's not for me)
1242 * - joins NI group address at in6_ifattach() time only, does not cope
1243 * with hostname changes by sethostname(3)
1245 static struct mbuf *
1246 ni6_input(struct mbuf *m, int off)
1248 struct icmp6_nodeinfo *ni6, *nni6;
1249 struct mbuf *n = NULL;
1253 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1254 struct ni_reply_fqdn *fqdn;
1255 int addrs; /* for NI_QTYPE_NODEADDR */
1256 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1257 struct in6_addr in6_subj; /* subject address */
1258 struct ip6_hdr *ip6;
1259 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1261 struct in6_ifaddr *ia6 = NULL;
1263 ip6 = mtod(m, struct ip6_hdr *);
1264 #ifndef PULLDOWN_TEST
1265 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1267 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1269 /* m is already reclaimed */
1275 * Validate IPv6 source address.
1276 * The default configuration MUST be to refuse answering queries from
1277 * global-scope addresses according to RFC4602.
1279 * - it's not very clear what "refuse" means; this implementation
1281 * - it's not very easy to identify global-scope (unicast) addresses
1282 * since there are many prefixes for them. It should be safer
1283 * and in practice sufficient to check "all" but loopback and
1284 * link-local (note that site-local unicast was deprecated and
1285 * ULA is defined as global scope-wise)
1287 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1288 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1289 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1293 * Validate IPv6 destination address.
1295 * The Responder must discard the Query without further processing
1296 * unless it is one of the Responder's unicast or anycast addresses, or
1297 * a link-local scope multicast address which the Responder has joined.
1298 * [RFC4602, Section 5.]
1300 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1301 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1303 /* else it's a link-local multicast, fine */
1304 } else { /* unicast or anycast */
1305 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
1306 goto bad; /* XXX impossible */
1308 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1309 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1310 ifa_free(&ia6->ia_ifa);
1311 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1312 "a temporary address in %s:%d",
1313 __FILE__, __LINE__));
1316 ifa_free(&ia6->ia_ifa);
1319 /* validate query Subject field. */
1320 qtype = ntohs(ni6->ni_qtype);
1321 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1324 case NI_QTYPE_SUPTYPES:
1326 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1330 case NI_QTYPE_NODEADDR:
1331 case NI_QTYPE_IPV4ADDR:
1332 switch (ni6->ni_code) {
1333 case ICMP6_NI_SUBJ_IPV6:
1334 #if ICMP6_NI_SUBJ_IPV6 != 0
1338 * backward compatibility - try to accept 03 draft
1339 * format, where no Subject is present.
1341 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1346 #if ICMP6_NI_SUBJ_IPV6 != 0
1347 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1351 if (subjlen != sizeof(struct in6_addr))
1355 * Validate Subject address.
1357 * Not sure what exactly "address belongs to the node"
1358 * means in the spec, is it just unicast, or what?
1360 * At this moment we consider Subject address as
1361 * "belong to the node" if the Subject address equals
1362 * to the IPv6 destination address; validation for
1363 * IPv6 destination address should have done enough
1366 * We do not do proxy at this moment.
1368 /* m_pulldown instead of copy? */
1369 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1370 subjlen, (caddr_t)&in6_subj);
1371 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1374 subj = (char *)&in6_subj;
1375 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1379 * XXX if we are to allow other cases, we should really
1380 * be careful about scope here.
1381 * basically, we should disallow queries toward IPv6
1382 * destination X with subject Y,
1383 * if scope(X) > scope(Y).
1384 * if we allow scope(X) > scope(Y), it will result in
1385 * information leakage across scope boundary.
1389 case ICMP6_NI_SUBJ_FQDN:
1391 * Validate Subject name with gethostname(3).
1393 * The behavior may need some debate, since:
1394 * - we are not sure if the node has FQDN as
1395 * hostname (returned by gethostname(3)).
1396 * - the code does wildcard match for truncated names.
1397 * however, we are not sure if we want to perform
1398 * wildcard match, if gethostname(3) side has
1399 * truncated hostname.
1401 pr = curthread->td_ucred->cr_prison;
1402 mtx_lock(&pr->pr_mtx);
1403 n = ni6_nametodns(pr->pr_hostname,
1404 strlen(pr->pr_hostname), 0);
1405 mtx_unlock(&pr->pr_mtx);
1406 if (!n || n->m_next || n->m_len == 0)
1408 IP6_EXTHDR_GET(subj, char *, m,
1409 off + sizeof(struct icmp6_nodeinfo), subjlen);
1412 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1420 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1427 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1430 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1433 case NI_QTYPE_NODEADDR:
1434 case NI_QTYPE_IPV4ADDR:
1435 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1440 /* guess reply length */
1443 break; /* no reply data */
1444 case NI_QTYPE_SUPTYPES:
1445 replylen += sizeof(u_int32_t);
1448 /* XXX will append an mbuf */
1449 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1451 case NI_QTYPE_NODEADDR:
1452 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1453 if ((replylen += addrs * (sizeof(struct in6_addr) +
1454 sizeof(u_int32_t))) > MCLBYTES)
1455 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1457 case NI_QTYPE_IPV4ADDR:
1458 /* unsupported - should respond with unknown Qtype? */
1462 * XXX: We must return a reply with the ICMP6 code
1463 * `unknown Qtype' in this case. However we regard the case
1464 * as an FQDN query for backward compatibility.
1465 * Older versions set a random value to this field,
1466 * so it rarely varies in the defined qtypes.
1467 * But the mechanism is not reliable...
1468 * maybe we should obsolete older versions.
1470 qtype = NI_QTYPE_FQDN;
1471 /* XXX will append an mbuf */
1472 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1477 /* Allocate an mbuf to reply. */
1478 if (replylen > MCLBYTES) {
1480 * XXX: should we try to allocate more? But MCLBYTES
1481 * is probably much larger than IPV6_MMTU...
1485 if (replylen > MHLEN)
1486 n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
1488 n = m_gethdr(M_NOWAIT, m->m_type);
1493 m_move_pkthdr(n, m); /* just for recvif and FIB */
1494 n->m_pkthdr.len = n->m_len = replylen;
1496 /* copy mbuf header and IPv6 + Node Information base headers */
1497 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1498 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1499 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1501 /* qtype dependent procedure */
1504 nni6->ni_code = ICMP6_NI_SUCCESS;
1507 case NI_QTYPE_SUPTYPES:
1510 nni6->ni_code = ICMP6_NI_SUCCESS;
1511 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1512 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1513 v = (u_int32_t)htonl(0x0000000f);
1514 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1518 nni6->ni_code = ICMP6_NI_SUCCESS;
1519 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1520 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1521 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1522 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1524 * XXX do we really have FQDN in hostname?
1526 pr = curthread->td_ucred->cr_prison;
1527 mtx_lock(&pr->pr_mtx);
1528 n->m_next = ni6_nametodns(pr->pr_hostname,
1529 strlen(pr->pr_hostname), oldfqdn);
1530 mtx_unlock(&pr->pr_mtx);
1531 if (n->m_next == NULL)
1533 /* XXX we assume that n->m_next is not a chain */
1534 if (n->m_next->m_next != NULL)
1536 n->m_pkthdr.len += n->m_next->m_len;
1538 case NI_QTYPE_NODEADDR:
1542 nni6->ni_code = ICMP6_NI_SUCCESS;
1543 n->m_pkthdr.len = n->m_len =
1544 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1545 lenlim = M_TRAILINGSPACE(n);
1546 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1547 /* XXX: reset mbuf length */
1548 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1549 sizeof(struct icmp6_nodeinfo) + copied;
1553 break; /* XXX impossible! */
1556 nni6->ni_type = ICMP6_NI_REPLY;
1568 * make a mbuf with DNS-encoded string. no compression support.
1570 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1571 * treated as truncated name (two \0 at the end). this is a wild guess.
1573 * old - return pascal string if non-zero
1575 static struct mbuf *
1576 ni6_nametodns(const char *name, int namelen, int old)
1588 /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
1590 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1592 m = m_get(M_NOWAIT, MT_DATA);
1598 *mtod(m, char *) = namelen;
1599 bcopy(name, mtod(m, char *) + 1, namelen);
1603 cp = mtod(m, char *);
1604 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1606 /* if not certain about my name, return empty buffer */
1611 * guess if it looks like shortened hostname, or FQDN.
1612 * shortened hostname needs two trailing "\0".
1615 for (p = name; p < name + namelen; p++) {
1616 if (*p && *p == '.')
1625 while (cp < ep && p < name + namelen) {
1627 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1629 /* result does not fit into mbuf */
1630 if (cp + i + 1 >= ep)
1633 * DNS label length restriction, RFC1035 page 8.
1634 * "i == 0" case is included here to avoid returning
1635 * 0-length label on "foo..bar".
1637 if (i <= 0 || i >= 64)
1643 if (p < name + namelen && *p == '.')
1647 if (cp + nterm >= ep)
1651 m->m_len = cp - mtod(m, char *);
1655 panic("should not reach here");
1665 * check if two DNS-encoded string matches. takes care of truncated
1666 * form (with \0\0 at the end). no compression support.
1667 * XXX upper/lowercase match (see RFC2065)
1670 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1672 const char *a0, *b0;
1675 /* simplest case - need validation? */
1676 if (alen == blen && bcmp(a, b, alen) == 0)
1682 /* termination is mandatory */
1683 if (alen < 2 || blen < 2)
1685 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1690 while (a - a0 < alen && b - b0 < blen) {
1691 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1694 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1696 /* we don't support compression yet */
1697 if (a[0] >= 64 || b[0] >= 64)
1700 /* truncated case */
1701 if (a[0] == 0 && a - a0 == alen - 1)
1703 if (b[0] == 0 && b - b0 == blen - 1)
1705 if (a[0] == 0 || b[0] == 0)
1711 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1713 if (bcmp(a + 1, b + 1, l) != 0)
1720 if (a - a0 == alen && b - b0 == blen)
1727 * calculate the number of addresses to be returned in the node info reply.
1730 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1731 struct in6_addr *subj)
1734 struct in6_ifaddr *ifa6;
1736 int addrs = 0, addrsofif, iffound = 0;
1737 int niflags = ni6->ni_flags;
1739 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1740 switch (ni6->ni_code) {
1741 case ICMP6_NI_SUBJ_IPV6:
1742 if (subj == NULL) /* must be impossible... */
1747 * XXX: we only support IPv6 subject address for
1754 IFNET_RLOCK_NOSLEEP();
1755 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
1758 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1759 if (ifa->ifa_addr->sa_family != AF_INET6)
1761 ifa6 = (struct in6_ifaddr *)ifa;
1763 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1764 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1768 * IPv4-mapped addresses can only be returned by a
1769 * Node Information proxy, since they represent
1770 * addresses of IPv4-only nodes, which perforce do
1771 * not implement this protocol.
1772 * [icmp-name-lookups-07, Section 5.4]
1773 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1774 * this function at this moment.
1777 /* What do we have to do about ::1? */
1778 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1779 case IPV6_ADDR_SCOPE_LINKLOCAL:
1780 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1783 case IPV6_ADDR_SCOPE_SITELOCAL:
1784 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1787 case IPV6_ADDR_SCOPE_GLOBAL:
1788 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1796 * check if anycast is okay.
1797 * XXX: just experimental. not in the spec.
1799 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1800 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1801 continue; /* we need only unicast addresses */
1802 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1803 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1806 addrsofif++; /* count the address */
1808 IF_ADDR_RUNLOCK(ifp);
1811 IFNET_RUNLOCK_NOSLEEP();
1817 IFNET_RUNLOCK_NOSLEEP();
1823 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1824 struct ifnet *ifp0, int resid)
1827 struct in6_ifaddr *ifa6;
1829 struct ifnet *ifp_dep = NULL;
1830 int copied = 0, allow_deprecated = 0;
1831 u_char *cp = (u_char *)(nni6 + 1);
1832 int niflags = ni6->ni_flags;
1835 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1836 return (0); /* needless to copy */
1838 IFNET_RLOCK_NOSLEEP();
1839 ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
1842 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1844 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1845 if (ifa->ifa_addr->sa_family != AF_INET6)
1847 ifa6 = (struct in6_ifaddr *)ifa;
1849 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1850 allow_deprecated == 0) {
1852 * prefererred address should be put before
1853 * deprecated addresses.
1856 /* record the interface for later search */
1857 if (ifp_dep == NULL)
1861 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1862 allow_deprecated != 0)
1863 continue; /* we now collect deprecated addrs */
1865 /* What do we have to do about ::1? */
1866 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1867 case IPV6_ADDR_SCOPE_LINKLOCAL:
1868 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1871 case IPV6_ADDR_SCOPE_SITELOCAL:
1872 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1875 case IPV6_ADDR_SCOPE_GLOBAL:
1876 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1884 * check if anycast is okay.
1885 * XXX: just experimental. not in the spec.
1887 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1888 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1890 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1891 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1895 /* now we can copy the address */
1896 if (resid < sizeof(struct in6_addr) +
1897 sizeof(u_int32_t)) {
1898 IF_ADDR_RUNLOCK(ifp);
1900 * We give up much more copy.
1901 * Set the truncate flag and return.
1903 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1904 IFNET_RUNLOCK_NOSLEEP();
1909 * Set the TTL of the address.
1910 * The TTL value should be one of the following
1911 * according to the specification:
1913 * 1. The remaining lifetime of a DHCP lease on the
1915 * 2. The remaining Valid Lifetime of a prefix from
1916 * which the address was derived through Stateless
1917 * Autoconfiguration.
1919 * Note that we currently do not support stateful
1920 * address configuration by DHCPv6, so the former
1921 * case can't happen.
1923 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1924 ltime = ND6_INFINITE_LIFETIME;
1926 if (ifa6->ia6_lifetime.ia6t_expire >
1928 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1933 bcopy(<ime, cp, sizeof(u_int32_t));
1934 cp += sizeof(u_int32_t);
1936 /* copy the address itself */
1937 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1938 sizeof(struct in6_addr));
1939 in6_clearscope((struct in6_addr *)cp); /* XXX */
1940 cp += sizeof(struct in6_addr);
1942 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1943 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1945 IF_ADDR_RUNLOCK(ifp);
1946 if (ifp0) /* we need search only on the specified IF */
1950 if (allow_deprecated == 0 && ifp_dep != NULL) {
1952 allow_deprecated = 1;
1957 IFNET_RUNLOCK_NOSLEEP();
1963 * XXX almost dup'ed code with rip6_input.
1966 icmp6_rip6_input(struct mbuf **mp, int off)
1968 struct mbuf *m = *mp;
1969 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1971 struct inpcb *last = NULL;
1972 struct sockaddr_in6 fromsa;
1973 struct icmp6_hdr *icmp6;
1974 struct mbuf *opts = NULL;
1976 #ifndef PULLDOWN_TEST
1977 /* this is assumed to be safe. */
1978 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1980 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1981 if (icmp6 == NULL) {
1982 /* m is already reclaimed */
1983 return (IPPROTO_DONE);
1988 * XXX: the address may have embedded scope zone ID, which should be
1989 * hidden from applications.
1991 bzero(&fromsa, sizeof(fromsa));
1992 fromsa.sin6_family = AF_INET6;
1993 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1994 fromsa.sin6_addr = ip6->ip6_src;
1995 if (sa6_recoverscope(&fromsa)) {
1997 return (IPPROTO_DONE);
2000 INP_INFO_RLOCK(&V_ripcbinfo);
2001 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
2002 if ((in6p->inp_vflag & INP_IPV6) == 0)
2004 if (in6p->inp_ip_p != IPPROTO_ICMPV6)
2006 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
2007 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
2009 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
2010 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
2013 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
2014 in6p->in6p_icmp6filt)) {
2019 struct mbuf *n = NULL;
2022 * Recent network drivers tend to allocate a single
2023 * mbuf cluster, rather than to make a couple of
2024 * mbufs without clusters. Also, since the IPv6 code
2025 * path tries to avoid m_pullup(), it is highly
2026 * probable that we still have an mbuf cluster here
2027 * even though the necessary length can be stored in an
2028 * mbuf's internal buffer.
2029 * Meanwhile, the default size of the receive socket
2030 * buffer for raw sockets is not so large. This means
2031 * the possibility of packet loss is relatively higher
2032 * than before. To avoid this scenario, we copy the
2033 * received data to a separate mbuf that does not use
2034 * a cluster, if possible.
2035 * XXX: it is better to copy the data after stripping
2036 * intermediate headers.
2038 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2039 m->m_len <= MHLEN) {
2040 n = m_get(M_NOWAIT, m->m_type);
2042 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2043 bcopy(m->m_data, n->m_data,
2045 n->m_len = m->m_len;
2053 (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
2054 if (last->inp_flags & INP_CONTROLOPTS)
2055 ip6_savecontrol(last, n, &opts);
2056 /* strip intermediate headers */
2058 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2059 if (sbappendaddr_locked(
2060 &last->inp_socket->so_rcv,
2061 (struct sockaddr *)&fromsa, n, opts)
2063 /* should notify about lost packet */
2069 &last->inp_socket->so_rcv);
2071 sorwakeup_locked(last->inp_socket);
2078 INP_INFO_RUNLOCK(&V_ripcbinfo);
2080 if (last->inp_flags & INP_CONTROLOPTS)
2081 ip6_savecontrol(last, m, &opts);
2082 /* strip intermediate headers */
2085 /* avoid using mbuf clusters if possible (see above) */
2086 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2087 m->m_len <= MHLEN) {
2090 n = m_get(M_NOWAIT, m->m_type);
2092 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2093 bcopy(m->m_data, n->m_data, m->m_len);
2094 n->m_len = m->m_len;
2104 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2105 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
2106 (struct sockaddr *)&fromsa, m, opts) == 0) {
2110 SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
2112 sorwakeup_locked(last->inp_socket);
2116 IP6STAT_DEC(ip6s_delivered);
2118 return IPPROTO_DONE;
2122 * Reflect the ip6 packet back to the source.
2123 * OFF points to the icmp6 header, counted from the top of the mbuf.
2126 icmp6_reflect(struct mbuf *m, size_t off)
2128 struct ip6_hdr *ip6;
2129 struct icmp6_hdr *icmp6;
2130 struct in6_ifaddr *ia = NULL;
2133 struct ifnet *outif = NULL;
2134 struct in6_addr origdst, src, *srcp = NULL;
2136 /* too short to reflect */
2137 if (off < sizeof(struct ip6_hdr)) {
2139 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2140 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2141 __FILE__, __LINE__));
2146 * If there are extra headers between IPv6 and ICMPv6, strip
2147 * off that header first.
2150 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2151 panic("assumption failed in icmp6_reflect");
2153 if (off > sizeof(struct ip6_hdr)) {
2155 struct ip6_hdr nip6;
2157 l = off - sizeof(struct ip6_hdr);
2158 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2160 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2162 if ((m = m_pullup(m, l)) == NULL)
2165 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2166 } else /* off == sizeof(struct ip6_hdr) */ {
2168 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2170 if ((m = m_pullup(m, l)) == NULL)
2174 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2175 ip6 = mtod(m, struct ip6_hdr *);
2176 ip6->ip6_nxt = IPPROTO_ICMPV6;
2177 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2178 type = icmp6->icmp6_type; /* keep type for statistics */
2179 code = icmp6->icmp6_code; /* ditto. */
2181 origdst = ip6->ip6_dst;
2183 * ip6_input() drops a packet if its src is multicast.
2184 * So, the src is never multicast.
2186 ip6->ip6_dst = ip6->ip6_src;
2189 * If the incoming packet was addressed directly to us (i.e. unicast),
2190 * use dst as the src for the reply.
2191 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2192 * (for example) when we encounter an error while forwarding procedure
2193 * destined to a duplicated address of ours.
2194 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2195 * procedure of an outgoing packet of our own, in which case we need
2196 * to search in the ifaddr list.
2198 if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2199 if ((ia = ip6_getdstifaddr(m))) {
2200 if (!(ia->ia6_flags &
2201 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2202 srcp = &ia->ia_addr.sin6_addr;
2204 struct sockaddr_in6 d;
2206 bzero(&d, sizeof(d));
2207 d.sin6_family = AF_INET6;
2208 d.sin6_len = sizeof(d);
2209 d.sin6_addr = origdst;
2210 ia = (struct in6_ifaddr *)
2211 ifa_ifwithaddr((struct sockaddr *)&d);
2214 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2215 srcp = &ia->ia_addr.sin6_addr;
2222 struct sockaddr_in6 sin6;
2223 struct route_in6 ro;
2226 * This case matches to multicasts, our anycast, or unicasts
2227 * that we do not own. Select a source address based on the
2228 * source address of the erroneous packet.
2230 bzero(&sin6, sizeof(sin6));
2231 sin6.sin6_family = AF_INET6;
2232 sin6.sin6_len = sizeof(sin6);
2233 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2235 bzero(&ro, sizeof(ro));
2236 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &src);
2238 RTFREE(ro.ro_rt); /* XXX: we could use this */
2240 char ip6buf[INET6_ADDRSTRLEN];
2242 "icmp6_reflect: source can't be determined: "
2243 "dst=%s, error=%d\n",
2244 ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
2250 ip6->ip6_src = *srcp;
2252 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2253 ip6->ip6_vfc |= IPV6_VERSION;
2254 ip6->ip6_nxt = IPPROTO_ICMPV6;
2256 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2257 else if (m->m_pkthdr.rcvif) {
2258 /* XXX: This may not be the outgoing interface */
2259 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2261 ip6->ip6_hlim = V_ip6_defhlim;
2263 icmp6->icmp6_cksum = 0;
2264 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2265 sizeof(struct ip6_hdr), plen);
2268 * XXX option handling
2271 m->m_flags &= ~(M_BCAST|M_MCAST);
2273 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2275 icmp6_ifoutstat_inc(outif, type, code);
2278 ifa_free(&ia->ia_ifa);
2283 ifa_free(&ia->ia_ifa);
2289 icmp6_fasttimo(void)
2296 icmp6_slowtimo(void)
2303 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2304 struct in6_addr *tgt6)
2306 static char buf[1024];
2307 char ip6bufs[INET6_ADDRSTRLEN];
2308 char ip6bufd[INET6_ADDRSTRLEN];
2309 char ip6buft[INET6_ADDRSTRLEN];
2310 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2311 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2312 ip6_sprintf(ip6buft, tgt6));
2317 icmp6_redirect_input(struct mbuf *m, int off)
2320 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2321 struct nd_redirect *nd_rd;
2322 int icmp6len = ntohs(ip6->ip6_plen);
2323 char *lladdr = NULL;
2325 struct rtentry *rt = NULL;
2328 struct in6_addr src6 = ip6->ip6_src;
2329 struct in6_addr redtgt6;
2330 struct in6_addr reddst6;
2331 union nd_opts ndopts;
2332 char ip6buf[INET6_ADDRSTRLEN];
2335 KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
2337 ifp = m->m_pkthdr.rcvif;
2339 /* XXX if we are router, we don't update route by icmp6 redirect */
2340 if (V_ip6_forwarding)
2342 if (!V_icmp6_rediraccept)
2345 #ifndef PULLDOWN_TEST
2346 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2347 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2349 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2350 if (nd_rd == NULL) {
2351 ICMP6STAT_INC(icp6s_tooshort);
2355 redtgt6 = nd_rd->nd_rd_target;
2356 reddst6 = nd_rd->nd_rd_dst;
2358 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2359 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2364 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2366 "ICMP6 redirect sent from %s rejected; "
2367 "must be from linklocal\n",
2368 ip6_sprintf(ip6buf, &src6)));
2371 if (ip6->ip6_hlim != 255) {
2373 "ICMP6 redirect sent from %s rejected; "
2374 "hlim=%d (must be 255)\n",
2375 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2379 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2380 struct sockaddr_in6 sin6;
2381 struct in6_addr *gw6;
2383 bzero(&sin6, sizeof(sin6));
2384 sin6.sin6_family = AF_INET6;
2385 sin6.sin6_len = sizeof(struct sockaddr_in6);
2386 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2387 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
2389 if (rt->rt_gateway == NULL ||
2390 rt->rt_gateway->sa_family != AF_INET6) {
2393 "ICMP6 redirect rejected; no route "
2394 "with inet6 gateway found for redirect dst: %s\n",
2395 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2399 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2400 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2403 "ICMP6 redirect rejected; "
2404 "not equal to gw-for-src=%s (must be same): "
2406 ip6_sprintf(ip6buf, gw6),
2407 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2412 "ICMP6 redirect rejected; "
2413 "no route found for redirect dst: %s\n",
2414 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2420 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2422 "ICMP6 redirect rejected; "
2423 "redirect dst must be unicast: %s\n",
2424 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2428 is_router = is_onlink = 0;
2429 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2430 is_router = 1; /* router case */
2431 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2432 is_onlink = 1; /* on-link destination case */
2433 if (!is_router && !is_onlink) {
2435 "ICMP6 redirect rejected; "
2436 "neither router case nor onlink case: %s\n",
2437 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2440 /* validation passed */
2442 icmp6len -= sizeof(*nd_rd);
2443 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2444 if (nd6_options(&ndopts) < 0) {
2445 nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
2446 __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2447 /* nd6_options have incremented stats */
2451 if (ndopts.nd_opts_tgt_lladdr) {
2452 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2453 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2456 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2457 nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
2458 "(if %d, icmp6 packet %d): %s\n",
2459 __func__, ip6_sprintf(ip6buf, &redtgt6),
2460 ifp->if_addrlen, lladdrlen - 2,
2461 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2466 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2467 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2469 if (!is_onlink) { /* better router case. perform rtredirect. */
2470 /* perform rtredirect */
2471 struct sockaddr_in6 sdst;
2472 struct sockaddr_in6 sgw;
2473 struct sockaddr_in6 ssrc;
2476 bzero(&sdst, sizeof(sdst));
2477 bzero(&sgw, sizeof(sgw));
2478 bzero(&ssrc, sizeof(ssrc));
2479 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2480 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2481 sizeof(struct sockaddr_in6);
2482 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2483 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2484 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2485 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
2486 in6_rtredirect((struct sockaddr *)&sdst,
2487 (struct sockaddr *)&sgw, (struct sockaddr *)NULL,
2488 RTF_GATEWAY | RTF_HOST, (struct sockaddr *)&ssrc,
2491 /* finally update cached route in each socket via pfctlinput */
2493 struct sockaddr_in6 sdst;
2495 bzero(&sdst, sizeof(sdst));
2496 sdst.sin6_family = AF_INET6;
2497 sdst.sin6_len = sizeof(struct sockaddr_in6);
2498 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2499 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2507 ICMP6STAT_INC(icp6s_badredirect);
2512 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2514 struct ifnet *ifp; /* my outgoing interface */
2515 struct in6_addr *ifp_ll6;
2516 struct in6_addr *router_ll6;
2517 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2518 struct mbuf *m = NULL; /* newly allocated one */
2520 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2521 struct nd_redirect *nd_rd;
2522 struct llentry *ln = NULL;
2525 struct ifnet *outif = NULL;
2526 struct sockaddr_in6 src_sa;
2528 icmp6_errcount(ND_REDIRECT, 0);
2530 /* if we are not router, we don't send icmp6 redirect */
2531 if (!V_ip6_forwarding)
2535 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2540 * the source address must identify a neighbor, and
2541 * the destination address must not be a multicast address
2542 * [RFC 2461, sec 8.2]
2544 sip6 = mtod(m0, struct ip6_hdr *);
2545 bzero(&src_sa, sizeof(src_sa));
2546 src_sa.sin6_family = AF_INET6;
2547 src_sa.sin6_len = sizeof(src_sa);
2548 src_sa.sin6_addr = sip6->ip6_src;
2549 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2551 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2552 goto fail; /* what should we do here? */
2555 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2559 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2560 * we almost always ask for an mbuf cluster for simplicity.
2561 * (MHLEN < IPV6_MMTU is almost always true)
2563 #if IPV6_MMTU >= MCLBYTES
2564 # error assumption failed about IPV6_MMTU and MCLBYTES
2566 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2569 M_SETFIB(m, rt->rt_fibnum);
2570 maxlen = M_TRAILINGSPACE(m);
2571 maxlen = min(IPV6_MMTU, maxlen);
2572 /* just for safety */
2573 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2574 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2579 /* get ip6 linklocal address for ifp(my outgoing interface). */
2580 struct in6_ifaddr *ia;
2581 if ((ia = in6ifa_ifpforlinklocal(ifp,
2583 IN6_IFF_ANYCAST)) == NULL)
2585 ifp_ll6 = &ia->ia_addr.sin6_addr;
2586 /* XXXRW: reference released prematurely. */
2587 ifa_free(&ia->ia_ifa);
2590 /* get ip6 linklocal address for the router. */
2591 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2592 struct sockaddr_in6 *sin6;
2593 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2594 router_ll6 = &sin6->sin6_addr;
2595 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2596 router_ll6 = (struct in6_addr *)NULL;
2598 router_ll6 = (struct in6_addr *)NULL;
2601 ip6 = mtod(m, struct ip6_hdr *);
2603 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2604 ip6->ip6_vfc |= IPV6_VERSION;
2605 /* ip6->ip6_plen will be set later */
2606 ip6->ip6_nxt = IPPROTO_ICMPV6;
2607 ip6->ip6_hlim = 255;
2608 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2609 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2610 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2613 nd_rd = (struct nd_redirect *)(ip6 + 1);
2614 nd_rd->nd_rd_type = ND_REDIRECT;
2615 nd_rd->nd_rd_code = 0;
2616 nd_rd->nd_rd_reserved = 0;
2617 if (rt->rt_flags & RTF_GATEWAY) {
2619 * nd_rd->nd_rd_target must be a link-local address in
2620 * better router cases.
2624 bcopy(router_ll6, &nd_rd->nd_rd_target,
2625 sizeof(nd_rd->nd_rd_target));
2626 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2627 sizeof(nd_rd->nd_rd_dst));
2629 /* make sure redtgt == reddst */
2630 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2631 sizeof(nd_rd->nd_rd_target));
2632 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2633 sizeof(nd_rd->nd_rd_dst));
2636 p = (u_char *)(nd_rd + 1);
2642 /* target lladdr option */
2644 struct nd_opt_hdr *nd_opt;
2647 IF_AFDATA_RLOCK(ifp);
2648 ln = nd6_lookup(router_ll6, 0, ifp);
2649 IF_AFDATA_RUNLOCK(ifp);
2653 len = sizeof(*nd_opt) + ifp->if_addrlen;
2654 len = (len + 7) & ~7; /* round by 8 */
2656 if (len + (p - (u_char *)ip6) > maxlen)
2659 if (ln->la_flags & LLE_VALID) {
2660 nd_opt = (struct nd_opt_hdr *)p;
2661 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2662 nd_opt->nd_opt_len = len >> 3;
2663 lladdr = (char *)(nd_opt + 1);
2664 bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen);
2672 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2674 /* just to be safe */
2675 #ifdef M_DECRYPTED /*not openbsd*/
2676 if (m0->m_flags & M_DECRYPTED)
2679 if (p - (u_char *)ip6 > maxlen)
2683 /* redirected header option */
2685 struct nd_opt_rd_hdr *nd_opt_rh;
2688 * compute the maximum size for icmp6 redirect header option.
2689 * XXX room for auth header?
2691 len = maxlen - (p - (u_char *)ip6);
2694 /* This is just for simplicity. */
2695 if (m0->m_pkthdr.len != m0->m_len) {
2697 m_freem(m0->m_next);
2700 m0->m_pkthdr.len = m0->m_len;
2704 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2705 * about padding/truncate rule for the original IP packet.
2706 * From the discussion on IPv6imp in Feb 1999,
2707 * the consensus was:
2708 * - "attach as much as possible" is the goal
2709 * - pad if not aligned (original size can be guessed by
2710 * original ip6 header)
2711 * Following code adds the padding if it is simple enough,
2712 * and truncates if not.
2714 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2715 panic("assumption failed in %s:%d", __FILE__,
2718 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2719 /* not enough room, truncate */
2720 m0->m_pkthdr.len = m0->m_len = len -
2723 /* enough room, pad or truncate */
2726 extra = m0->m_pkthdr.len % 8;
2728 /* pad if easy enough, truncate if not */
2729 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2731 m0->m_len += (8 - extra);
2732 m0->m_pkthdr.len += (8 - extra);
2735 m0->m_pkthdr.len -= extra;
2739 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2740 m0->m_pkthdr.len = m0->m_len = len -
2744 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2745 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2746 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2747 nd_opt_rh->nd_opt_rh_len = len >> 3;
2748 p += sizeof(*nd_opt_rh);
2749 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2751 /* connect m0 to m */
2752 m_tag_delete_chain(m0, NULL);
2753 m0->m_flags &= ~M_PKTHDR;
2755 m->m_pkthdr.len = m->m_len + m0->m_len;
2764 /* XXX: clear embedded link IDs in the inner header */
2765 in6_clearscope(&sip6->ip6_src);
2766 in6_clearscope(&sip6->ip6_dst);
2767 in6_clearscope(&nd_rd->nd_rd_target);
2768 in6_clearscope(&nd_rd->nd_rd_dst);
2770 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2772 nd_rd->nd_rd_cksum = 0;
2773 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2774 sizeof(*ip6), ntohs(ip6->ip6_plen));
2776 if (send_sendso_input_hook != NULL) {
2777 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
2781 *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
2782 m_tag_prepend(m, mtag);
2785 /* send the packet to outside... */
2786 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2788 icmp6_ifstat_inc(outif, ifs6_out_msg);
2789 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2791 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2803 * ICMPv6 socket option processing.
2806 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2810 struct inpcb *inp = sotoinpcb(so);
2811 int level, op, optname;
2814 level = sopt->sopt_level;
2815 op = sopt->sopt_dir;
2816 optname = sopt->sopt_name;
2817 optlen = sopt->sopt_valsize;
2819 level = op = optname = optlen = 0;
2821 if (level != IPPROTO_ICMPV6) {
2830 struct icmp6_filter ic6f;
2832 if (optlen != sizeof(ic6f)) {
2836 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2839 *inp->in6p_icmp6filt = ic6f;
2846 error = ENOPROTOOPT;
2855 struct icmp6_filter ic6f;
2858 ic6f = *inp->in6p_icmp6filt;
2860 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2865 error = ENOPROTOOPT;
2875 * Perform rate limit check.
2876 * Returns 0 if it is okay to send the icmp6 packet.
2877 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2880 * XXX per-destination/type check necessary?
2882 * dst - not used at this moment
2883 * type - not used at this moment
2884 * code - not used at this moment
2887 icmp6_ratelimit(const struct in6_addr *dst, const int type,
2892 ret = 0; /* okay to send */
2895 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2896 V_icmp6errppslim)) {
2897 /* The packet is subject to rate limit */