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 * 3. 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("$FreeBSD$");
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_types.h>
93 #include <net/route.h>
96 #include <netinet/in.h>
97 #include <netinet/in_pcb.h>
98 #include <netinet/in_var.h>
99 #include <netinet/ip6.h>
100 #include <netinet/icmp6.h>
101 #include <netinet/tcp_var.h>
103 #include <netinet6/in6_fib.h>
104 #include <netinet6/in6_ifattach.h>
105 #include <netinet6/in6_pcb.h>
106 #include <netinet6/ip6protosw.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet6/scope6_var.h>
109 #include <netinet6/mld6_var.h>
110 #include <netinet6/nd6.h>
111 #include <netinet6/send.h>
113 extern struct domain inet6domain;
115 VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
116 VNET_PCPUSTAT_SYSINIT(icmp6stat);
119 VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
122 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
123 VNET_DECLARE(struct inpcbhead, ripcb);
124 VNET_DECLARE(int, icmp6errppslim);
125 static VNET_DEFINE(int, icmp6errpps_count) = 0;
126 static VNET_DEFINE(struct timeval, icmp6errppslim_last);
127 VNET_DECLARE(int, icmp6_nodeinfo);
129 #define V_ripcbinfo VNET(ripcbinfo)
130 #define V_ripcb VNET(ripcb)
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 int icmp6_ratelimit(const struct in6_addr *, const int, const int);
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);
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, 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 #ifndef PULLDOWN_TEST
234 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
236 if (m->m_len < sizeof(struct ip6_hdr)) {
237 m = m_pullup(m, sizeof(struct ip6_hdr));
243 ip6 = mtod(m, struct ip6_hdr *);
245 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
247 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
250 icmp6_error(m, type, code, param);
254 * Generate an error packet of type error in response to bad IP6 packet.
257 icmp6_error(struct mbuf *m, int type, int code, int param)
259 struct ip6_hdr *oip6, *nip6;
260 struct icmp6_hdr *icmp6;
265 ICMP6STAT_INC(icp6s_error);
267 /* count per-type-code statistics */
268 icmp6_errcount(type, code);
270 #ifdef M_DECRYPTED /*not openbsd*/
271 if (m->m_flags & M_DECRYPTED) {
272 ICMP6STAT_INC(icp6s_canterror);
277 #ifndef PULLDOWN_TEST
278 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
280 if (m->m_len < sizeof(struct ip6_hdr)) {
281 m = m_pullup(m, sizeof(struct ip6_hdr));
286 oip6 = mtod(m, struct ip6_hdr *);
289 * If the destination address of the erroneous packet is a multicast
290 * address, or the packet was sent using link-layer multicast,
291 * we should basically suppress sending an error (RFC 2463, Section
293 * We have two exceptions (the item e.2 in that section):
294 * - the Packet Too Big message can be sent for path MTU discovery.
295 * - the Parameter Problem Message that can be allowed an icmp6 error
296 * in the option type field. This check has been done in
297 * ip6_unknown_opt(), so we can just check the type and code.
299 if ((m->m_flags & (M_BCAST|M_MCAST) ||
300 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
301 (type != ICMP6_PACKET_TOO_BIG &&
302 (type != ICMP6_PARAM_PROB ||
303 code != ICMP6_PARAMPROB_OPTION)))
307 * RFC 2463, 2.4 (e.5): source address check.
308 * XXX: the case of anycast source?
310 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
311 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
315 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
319 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
320 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
321 struct icmp6_hdr *icp;
323 #ifndef PULLDOWN_TEST
324 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
325 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
327 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
330 ICMP6STAT_INC(icp6s_tooshort);
334 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
335 icp->icmp6_type == ND_REDIRECT) {
338 * Special case: for redirect (which is
339 * informational) we must not send icmp6 error.
341 ICMP6STAT_INC(icp6s_canterror);
344 /* ICMPv6 informational - send the error */
347 /* non-ICMPv6 - send the error */
350 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
352 /* Finally, do rate limitation check. */
353 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
354 ICMP6STAT_INC(icp6s_toofreq);
359 * OK, ICMP6 can be generated.
362 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
363 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
365 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
366 M_PREPEND(m, preplen, M_NOWAIT); /* FIB is also copied over. */
368 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
372 nip6 = mtod(m, struct ip6_hdr *);
373 nip6->ip6_src = oip6->ip6_src;
374 nip6->ip6_dst = oip6->ip6_dst;
376 in6_clearscope(&oip6->ip6_src);
377 in6_clearscope(&oip6->ip6_dst);
379 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
380 icmp6->icmp6_type = type;
381 icmp6->icmp6_code = code;
382 icmp6->icmp6_pptr = htonl((u_int32_t)param);
385 * icmp6_reflect() is designed to be in the input path.
386 * icmp6_error() can be called from both input and output path,
387 * and if we are in output path rcvif could contain bogus value.
388 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
389 * information in ip header (nip6).
391 m->m_pkthdr.rcvif = NULL;
393 ICMP6STAT_INC(icp6s_outhist[type]);
394 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
400 * If we can't tell whether or not we can generate ICMP6, free it.
406 * Process a received ICMP6 message.
409 icmp6_input(struct mbuf **mp, int *offp, int proto)
411 struct mbuf *m = *mp, *n;
413 struct ip6_hdr *ip6, *nip6;
414 struct icmp6_hdr *icmp6, *nicmp6;
416 int icmp6len = m->m_pkthdr.len - *offp;
418 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
421 ifp = m->m_pkthdr.rcvif;
423 #ifndef PULLDOWN_TEST
424 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
425 /* m might change if M_LOOP. So, call mtod after this */
429 * Locate icmp6 structure in mbuf, and check
430 * that not corrupted and of at least minimum length
433 ip6 = mtod(m, struct ip6_hdr *);
434 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
435 if (icmp6len < sizeof(struct icmp6_hdr)) {
436 ICMP6STAT_INC(icp6s_tooshort);
441 * Check multicast group membership.
442 * Note: SSM filters are not applied for ICMPv6 traffic.
444 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
445 struct in6_multi *inm;
447 inm = in6m_lookup(ifp, &ip6->ip6_dst);
449 IP6STAT_INC(ip6s_notmember);
450 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
456 * calculate the checksum
458 #ifndef PULLDOWN_TEST
459 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
461 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
463 ICMP6STAT_INC(icp6s_tooshort);
467 code = icmp6->icmp6_code;
469 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
471 "ICMP6 checksum error(%d|%x) %s\n",
472 icmp6->icmp6_type, sum,
473 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
474 ICMP6STAT_INC(icp6s_checksum);
478 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
479 icmp6_ifstat_inc(ifp, ifs6_in_msg);
480 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
481 icmp6_ifstat_inc(ifp, ifs6_in_error);
483 switch (icmp6->icmp6_type) {
484 case ICMP6_DST_UNREACH:
485 icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
487 case ICMP6_DST_UNREACH_NOROUTE:
488 case ICMP6_DST_UNREACH_ADDR: /* PRC_HOSTDEAD is a DOS */
489 code = PRC_UNREACH_NET;
491 case ICMP6_DST_UNREACH_ADMIN:
492 icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
493 code = PRC_UNREACH_ADMIN_PROHIB;
495 case ICMP6_DST_UNREACH_BEYONDSCOPE:
496 /* I mean "source address was incorrect." */
497 code = PRC_PARAMPROB;
499 case ICMP6_DST_UNREACH_NOPORT:
500 code = PRC_UNREACH_PORT;
508 case ICMP6_PACKET_TOO_BIG:
509 icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
511 /* validation is made in icmp6_mtudisc_update */
516 * Updating the path MTU will be done after examining
517 * intermediate extension headers.
522 case ICMP6_TIME_EXCEEDED:
523 icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
525 case ICMP6_TIME_EXCEED_TRANSIT:
526 code = PRC_TIMXCEED_INTRANS;
528 case ICMP6_TIME_EXCEED_REASSEMBLY:
529 code = PRC_TIMXCEED_REASS;
537 case ICMP6_PARAM_PROB:
538 icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
540 case ICMP6_PARAMPROB_NEXTHEADER:
541 code = PRC_UNREACH_PROTOCOL;
543 case ICMP6_PARAMPROB_HEADER:
544 case ICMP6_PARAMPROB_OPTION:
545 code = PRC_PARAMPROB;
553 case ICMP6_ECHO_REQUEST:
554 icmp6_ifstat_inc(ifp, ifs6_in_echo);
557 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
562 || n->m_len < off + sizeof(struct icmp6_hdr)) {
566 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
567 n = m_gethdr(M_NOWAIT, n0->m_type);
574 m_move_pkthdr(n, n0); /* FIB copied. */
575 n0len = n0->m_pkthdr.len; /* save for use below */
577 * Copy IPv6 and ICMPv6 only.
579 nip6 = mtod(n, struct ip6_hdr *);
580 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
581 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
582 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
583 noff = sizeof(struct ip6_hdr);
584 /* new mbuf contains only ipv6+icmpv6 headers */
585 n->m_len = noff + sizeof(struct icmp6_hdr);
587 * Adjust mbuf. ip6_plen will be adjusted in
590 m_adj(n0, off + sizeof(struct icmp6_hdr));
591 /* recalculate complete packet size */
592 n->m_pkthdr.len = n0len + (noff - off);
595 nip6 = mtod(n, struct ip6_hdr *);
596 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
601 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
602 nicmp6->icmp6_code = 0;
603 ICMP6STAT_INC(icp6s_reflect);
604 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
605 icmp6_reflect(n, noff);
609 case ICMP6_ECHO_REPLY:
610 icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
615 case MLD_LISTENER_QUERY:
616 case MLD_LISTENER_REPORT:
617 case MLD_LISTENER_DONE:
618 case MLDV2_LISTENER_REPORT:
620 * Drop MLD traffic which is not link-local, has a hop limit
621 * of greater than 1 hop, or which does not have the
622 * IPv6 HBH Router Alert option.
623 * As IPv6 HBH options are stripped in ip6_input() we must
624 * check an mbuf header flag.
625 * XXX Should we also sanity check that these messages
626 * were directed to a link-local multicast prefix?
628 if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
630 if (mld_input(m, off, icmp6len) != 0)
631 return (IPPROTO_DONE);
635 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
637 enum { WRU, FQDN } mode;
639 if (!V_icmp6_nodeinfo)
642 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
644 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
650 #ifndef PULLDOWN_TEST
651 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
654 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
656 n = ni6_input(n, off);
657 /* XXX meaningless if n == NULL */
658 noff = sizeof(struct ip6_hdr);
665 * XXX: this combination of flags is pointless,
666 * but should we keep this for compatibility?
668 if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
669 ICMP6_NODEINFO_TMPADDROK)) !=
670 (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
676 CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
677 n = m_gethdr(M_NOWAIT, m->m_type);
682 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
684 * Previous code did a blind M_COPY_PKTHDR
685 * and said "just for rcvif". If true, then
686 * we could tolerate the dup failing (due to
687 * the deep copy of the tag chain). For now
688 * be conservative and just fail.
694 maxhlen = M_TRAILINGSPACE(n) -
695 (sizeof(*nip6) + sizeof(*nicmp6) + 4);
696 pr = curthread->td_ucred->cr_prison;
697 mtx_lock(&pr->pr_mtx);
698 hlen = strlen(pr->pr_hostname);
702 * Copy IPv6 and ICMPv6 only.
704 nip6 = mtod(n, struct ip6_hdr *);
705 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
706 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
707 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
708 p = (u_char *)(nicmp6 + 1);
710 /* meaningless TTL */
711 bcopy(pr->pr_hostname, p + 4, maxhlen);
712 mtx_unlock(&pr->pr_mtx);
713 noff = sizeof(struct ip6_hdr);
714 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
715 sizeof(struct icmp6_hdr) + 4 + maxhlen;
716 nicmp6->icmp6_type = ICMP6_WRUREPLY;
717 nicmp6->icmp6_code = 0;
720 ICMP6STAT_INC(icp6s_reflect);
721 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
722 icmp6_reflect(n, noff);
732 case ND_ROUTER_SOLICIT:
733 icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
736 if (icmp6len < sizeof(struct nd_router_solicit))
738 if (send_sendso_input_hook != NULL) {
739 IP6_EXTHDR_CHECK(m, off, icmp6len, IPPROTO_DONE);
740 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
746 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
747 nd6_rs_input(m, off, icmp6len);
753 case ND_ROUTER_ADVERT:
754 icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
757 if (icmp6len < sizeof(struct nd_router_advert))
759 if (send_sendso_input_hook != NULL) {
760 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
766 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
767 nd6_ra_input(m, off, icmp6len);
773 case ND_NEIGHBOR_SOLICIT:
774 icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
777 if (icmp6len < sizeof(struct nd_neighbor_solicit))
779 if (send_sendso_input_hook != NULL) {
780 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
786 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
787 nd6_ns_input(m, off, icmp6len);
793 case ND_NEIGHBOR_ADVERT:
794 icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
797 if (icmp6len < sizeof(struct nd_neighbor_advert))
799 if (send_sendso_input_hook != NULL) {
800 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
806 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
807 nd6_na_input(m, off, icmp6len);
814 icmp6_ifstat_inc(ifp, ifs6_in_redirect);
817 if (icmp6len < sizeof(struct nd_redirect))
819 if (send_sendso_input_hook != NULL) {
820 error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
826 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
827 icmp6_redirect_input(m, off);
833 case ICMP6_ROUTER_RENUMBERING:
834 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
835 code != ICMP6_ROUTER_RENUMBERING_RESULT)
837 if (icmp6len < sizeof(struct icmp6_router_renum))
843 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
844 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
845 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
846 ifp ? ifp->if_index : 0));
847 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
848 /* ICMPv6 error: MUST deliver it by spec... */
852 /* ICMPv6 informational: MUST not deliver */
856 if (icmp6_notify_error(&m, off, icmp6len, code) != 0) {
857 /* In this case, m should've been freed. */
858 return (IPPROTO_DONE);
863 ICMP6STAT_INC(icp6s_badcode);
867 ICMP6STAT_INC(icp6s_badlen);
871 /* deliver the packet to appropriate sockets */
872 icmp6_rip6_input(&m, *offp);
882 icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
884 struct mbuf *m = *mp;
885 struct icmp6_hdr *icmp6;
886 struct ip6_hdr *eip6;
888 struct sockaddr_in6 icmp6src, icmp6dst;
890 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
891 ICMP6STAT_INC(icp6s_tooshort);
894 #ifndef PULLDOWN_TEST
895 IP6_EXTHDR_CHECK(m, off,
896 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
897 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
899 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
900 sizeof(*icmp6) + sizeof(struct ip6_hdr));
902 ICMP6STAT_INC(icp6s_tooshort);
906 eip6 = (struct ip6_hdr *)(icmp6 + 1);
908 /* Detect the upper level protocol */
910 void (*ctlfunc)(int, struct sockaddr *, void *);
911 u_int8_t nxt = eip6->ip6_nxt;
912 int eoff = off + sizeof(struct icmp6_hdr) +
913 sizeof(struct ip6_hdr);
914 struct ip6ctlparam ip6cp;
915 struct in6_addr *finaldst = NULL;
916 int icmp6type = icmp6->icmp6_type;
918 struct ip6_rthdr *rth;
919 struct ip6_rthdr0 *rth0;
922 while (1) { /* XXX: should avoid infinite loop explicitly? */
926 case IPPROTO_HOPOPTS:
927 case IPPROTO_DSTOPTS:
929 #ifndef PULLDOWN_TEST
930 IP6_EXTHDR_CHECK(m, 0,
931 eoff + sizeof(struct ip6_ext), -1);
932 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
934 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
937 ICMP6STAT_INC(icp6s_tooshort);
942 if (nxt == IPPROTO_AH)
943 eoff += (eh->ip6e_len + 2) << 2;
945 eoff += (eh->ip6e_len + 1) << 3;
948 case IPPROTO_ROUTING:
950 * When the erroneous packet contains a
951 * routing header, we should examine the
952 * header to determine the final destination.
953 * Otherwise, we can't properly update
954 * information that depends on the final
955 * destination (e.g. path MTU).
957 #ifndef PULLDOWN_TEST
958 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
959 rth = (struct ip6_rthdr *)
960 (mtod(m, caddr_t) + eoff);
962 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
965 ICMP6STAT_INC(icp6s_tooshort);
969 rthlen = (rth->ip6r_len + 1) << 3;
971 * XXX: currently there is no
972 * officially defined type other
974 * Note that if the segment left field
975 * is 0, all intermediate hops must
978 if (rth->ip6r_segleft &&
979 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
982 #ifndef PULLDOWN_TEST
983 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
984 rth0 = (struct ip6_rthdr0 *)
985 (mtod(m, caddr_t) + eoff);
988 struct ip6_rthdr0 *, m,
991 ICMP6STAT_INC(icp6s_tooshort);
995 /* just ignore a bogus header */
996 if ((rth0->ip6r0_len % 2) == 0 &&
997 (hops = rth0->ip6r0_len/2))
998 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
1001 nxt = rth->ip6r_nxt;
1003 case IPPROTO_FRAGMENT:
1004 #ifndef PULLDOWN_TEST
1005 IP6_EXTHDR_CHECK(m, 0, eoff +
1006 sizeof(struct ip6_frag), -1);
1007 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1010 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1013 ICMP6STAT_INC(icp6s_tooshort);
1018 * Data after a fragment header is meaningless
1019 * unless it is the first fragment, but
1020 * we'll go to the notify label for path MTU
1023 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1026 eoff += sizeof(struct ip6_frag);
1031 * This case includes ESP and the No Next
1032 * Header. In such cases going to the notify
1033 * label does not have any meaning
1034 * (i.e. ctlfunc will be NULL), but we go
1035 * anyway since we might have to update
1036 * path MTU information.
1042 #ifndef PULLDOWN_TEST
1043 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1045 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1046 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1047 if (icmp6 == NULL) {
1048 ICMP6STAT_INC(icp6s_tooshort);
1054 * retrieve parameters from the inner IPv6 header, and convert
1055 * them into sockaddr structures.
1056 * XXX: there is no guarantee that the source or destination
1057 * addresses of the inner packet are in the same scope as
1058 * the addresses of the icmp packet. But there is no other
1059 * way to determine the zone.
1061 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1063 bzero(&icmp6dst, sizeof(icmp6dst));
1064 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1065 icmp6dst.sin6_family = AF_INET6;
1066 if (finaldst == NULL)
1067 icmp6dst.sin6_addr = eip6->ip6_dst;
1069 icmp6dst.sin6_addr = *finaldst;
1070 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1072 bzero(&icmp6src, sizeof(icmp6src));
1073 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1074 icmp6src.sin6_family = AF_INET6;
1075 icmp6src.sin6_addr = eip6->ip6_src;
1076 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1078 icmp6src.sin6_flowinfo =
1079 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1081 if (finaldst == NULL)
1082 finaldst = &eip6->ip6_dst;
1084 ip6cp.ip6c_icmp6 = icmp6;
1085 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1086 ip6cp.ip6c_off = eoff;
1087 ip6cp.ip6c_finaldst = finaldst;
1088 ip6cp.ip6c_src = &icmp6src;
1089 ip6cp.ip6c_nxt = nxt;
1091 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1092 notifymtu = ntohl(icmp6->icmp6_mtu);
1093 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1094 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1097 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1098 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1100 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1113 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1115 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1116 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1117 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1118 u_int mtu = ntohl(icmp6->icmp6_mtu);
1119 struct in_conninfo inc;
1123 * RFC2460 section 5, last paragraph.
1124 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1125 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1126 * due to packet translator in the middle.
1127 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1130 if (mtu < IPV6_MMTU)
1135 * we reject ICMPv6 too big with abnormally small value.
1136 * XXX what is the good definition of "abnormally small"?
1138 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1145 * In case the suggested mtu is less than IPV6_MMTU, we
1146 * only need to remember that it was for above mentioned
1147 * "alwaysfrag" case.
1148 * Try to be as close to the spec as possible.
1150 if (mtu < IPV6_MMTU)
1151 mtu = IPV6_MMTU - 8;
1153 bzero(&inc, sizeof(inc));
1154 inc.inc_fibnum = M_GETFIB(m);
1155 inc.inc_flags |= INC_ISIPV6;
1156 inc.inc6_faddr = *dst;
1157 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1160 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1161 tcp_hc_updatemtu(&inc, mtu);
1162 ICMP6STAT_INC(icp6s_pmtuchg);
1167 * Process a Node Information Query packet, based on
1168 * draft-ietf-ipngwg-icmp-name-lookups-07.
1170 * Spec incompatibilities:
1171 * - IPv6 Subject address handling
1172 * - IPv4 Subject address handling support missing
1173 * - Proxy reply (answer even if it's not for me)
1174 * - joins NI group address at in6_ifattach() time only, does not cope
1175 * with hostname changes by sethostname(3)
1177 static struct mbuf *
1178 ni6_input(struct mbuf *m, int off)
1180 struct icmp6_nodeinfo *ni6, *nni6;
1181 struct mbuf *n = NULL;
1185 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1186 struct ni_reply_fqdn *fqdn;
1187 int addrs; /* for NI_QTYPE_NODEADDR */
1188 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1189 struct in6_addr in6_subj; /* subject address */
1190 struct ip6_hdr *ip6;
1191 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1193 struct in6_ifaddr *ia6 = NULL;
1195 ip6 = mtod(m, struct ip6_hdr *);
1196 #ifndef PULLDOWN_TEST
1197 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1199 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1201 /* m is already reclaimed */
1207 * Validate IPv6 source address.
1208 * The default configuration MUST be to refuse answering queries from
1209 * global-scope addresses according to RFC4602.
1211 * - it's not very clear what "refuse" means; this implementation
1213 * - it's not very easy to identify global-scope (unicast) addresses
1214 * since there are many prefixes for them. It should be safer
1215 * and in practice sufficient to check "all" but loopback and
1216 * link-local (note that site-local unicast was deprecated and
1217 * ULA is defined as global scope-wise)
1219 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1220 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1221 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1225 * Validate IPv6 destination address.
1227 * The Responder must discard the Query without further processing
1228 * unless it is one of the Responder's unicast or anycast addresses, or
1229 * a link-local scope multicast address which the Responder has joined.
1230 * [RFC4602, Section 5.]
1232 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1233 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1235 /* else it's a link-local multicast, fine */
1236 } else { /* unicast or anycast */
1237 ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
1239 goto bad; /* XXX impossible */
1241 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1242 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1243 ifa_free(&ia6->ia_ifa);
1244 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1245 "a temporary address in %s:%d",
1246 __FILE__, __LINE__));
1249 ifa_free(&ia6->ia_ifa);
1252 /* validate query Subject field. */
1253 qtype = ntohs(ni6->ni_qtype);
1254 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1257 case NI_QTYPE_SUPTYPES:
1259 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1263 case NI_QTYPE_NODEADDR:
1264 case NI_QTYPE_IPV4ADDR:
1265 switch (ni6->ni_code) {
1266 case ICMP6_NI_SUBJ_IPV6:
1267 #if ICMP6_NI_SUBJ_IPV6 != 0
1271 * backward compatibility - try to accept 03 draft
1272 * format, where no Subject is present.
1274 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1279 #if ICMP6_NI_SUBJ_IPV6 != 0
1280 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1284 if (subjlen != sizeof(struct in6_addr))
1288 * Validate Subject address.
1290 * Not sure what exactly "address belongs to the node"
1291 * means in the spec, is it just unicast, or what?
1293 * At this moment we consider Subject address as
1294 * "belong to the node" if the Subject address equals
1295 * to the IPv6 destination address; validation for
1296 * IPv6 destination address should have done enough
1299 * We do not do proxy at this moment.
1301 /* m_pulldown instead of copy? */
1302 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1303 subjlen, (caddr_t)&in6_subj);
1304 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1307 subj = (char *)&in6_subj;
1308 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1312 * XXX if we are to allow other cases, we should really
1313 * be careful about scope here.
1314 * basically, we should disallow queries toward IPv6
1315 * destination X with subject Y,
1316 * if scope(X) > scope(Y).
1317 * if we allow scope(X) > scope(Y), it will result in
1318 * information leakage across scope boundary.
1322 case ICMP6_NI_SUBJ_FQDN:
1324 * Validate Subject name with gethostname(3).
1326 * The behavior may need some debate, since:
1327 * - we are not sure if the node has FQDN as
1328 * hostname (returned by gethostname(3)).
1329 * - the code does wildcard match for truncated names.
1330 * however, we are not sure if we want to perform
1331 * wildcard match, if gethostname(3) side has
1332 * truncated hostname.
1334 pr = curthread->td_ucred->cr_prison;
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 IP6_EXTHDR_GET(subj, char *, m,
1342 off + sizeof(struct icmp6_nodeinfo), subjlen);
1345 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1353 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1360 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1363 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1366 case NI_QTYPE_NODEADDR:
1367 case NI_QTYPE_IPV4ADDR:
1368 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1373 /* guess reply length */
1376 break; /* no reply data */
1377 case NI_QTYPE_SUPTYPES:
1378 replylen += sizeof(u_int32_t);
1381 /* XXX will append an mbuf */
1382 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1384 case NI_QTYPE_NODEADDR:
1385 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1386 if ((replylen += addrs * (sizeof(struct in6_addr) +
1387 sizeof(u_int32_t))) > MCLBYTES)
1388 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1390 case NI_QTYPE_IPV4ADDR:
1391 /* unsupported - should respond with unknown Qtype? */
1395 * XXX: We must return a reply with the ICMP6 code
1396 * `unknown Qtype' in this case. However we regard the case
1397 * as an FQDN query for backward compatibility.
1398 * Older versions set a random value to this field,
1399 * so it rarely varies in the defined qtypes.
1400 * But the mechanism is not reliable...
1401 * maybe we should obsolete older versions.
1403 qtype = NI_QTYPE_FQDN;
1404 /* XXX will append an mbuf */
1405 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1410 /* Allocate an mbuf to reply. */
1411 if (replylen > MCLBYTES) {
1413 * XXX: should we try to allocate more? But MCLBYTES
1414 * is probably much larger than IPV6_MMTU...
1418 if (replylen > MHLEN)
1419 n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
1421 n = m_gethdr(M_NOWAIT, m->m_type);
1426 m_move_pkthdr(n, m); /* just for recvif and FIB */
1427 n->m_pkthdr.len = n->m_len = replylen;
1429 /* copy mbuf header and IPv6 + Node Information base headers */
1430 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1431 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1432 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1434 /* qtype dependent procedure */
1437 nni6->ni_code = ICMP6_NI_SUCCESS;
1440 case NI_QTYPE_SUPTYPES:
1443 nni6->ni_code = ICMP6_NI_SUCCESS;
1444 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1445 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1446 v = (u_int32_t)htonl(0x0000000f);
1447 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1451 nni6->ni_code = ICMP6_NI_SUCCESS;
1452 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1453 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1454 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1455 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1457 * XXX do we really have FQDN in hostname?
1459 pr = curthread->td_ucred->cr_prison;
1460 mtx_lock(&pr->pr_mtx);
1461 n->m_next = ni6_nametodns(pr->pr_hostname,
1462 strlen(pr->pr_hostname), oldfqdn);
1463 mtx_unlock(&pr->pr_mtx);
1464 if (n->m_next == NULL)
1466 /* XXX we assume that n->m_next is not a chain */
1467 if (n->m_next->m_next != NULL)
1469 n->m_pkthdr.len += n->m_next->m_len;
1471 case NI_QTYPE_NODEADDR:
1475 nni6->ni_code = ICMP6_NI_SUCCESS;
1476 n->m_pkthdr.len = n->m_len =
1477 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1478 lenlim = M_TRAILINGSPACE(n);
1479 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1480 /* XXX: reset mbuf length */
1481 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1482 sizeof(struct icmp6_nodeinfo) + copied;
1486 break; /* XXX impossible! */
1489 nni6->ni_type = ICMP6_NI_REPLY;
1501 * make a mbuf with DNS-encoded string. no compression support.
1503 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1504 * treated as truncated name (two \0 at the end). this is a wild guess.
1506 * old - return pascal string if non-zero
1508 static struct mbuf *
1509 ni6_nametodns(const char *name, int namelen, int old)
1521 /* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
1523 m = m_getcl(M_NOWAIT, MT_DATA, 0);
1525 m = m_get(M_NOWAIT, MT_DATA);
1531 *mtod(m, char *) = namelen;
1532 bcopy(name, mtod(m, char *) + 1, namelen);
1536 cp = mtod(m, char *);
1537 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1539 /* if not certain about my name, return empty buffer */
1544 * guess if it looks like shortened hostname, or FQDN.
1545 * shortened hostname needs two trailing "\0".
1548 for (p = name; p < name + namelen; p++) {
1549 if (*p && *p == '.')
1558 while (cp < ep && p < name + namelen) {
1560 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1562 /* result does not fit into mbuf */
1563 if (cp + i + 1 >= ep)
1566 * DNS label length restriction, RFC1035 page 8.
1567 * "i == 0" case is included here to avoid returning
1568 * 0-length label on "foo..bar".
1570 if (i <= 0 || i >= 64)
1576 if (p < name + namelen && *p == '.')
1580 if (cp + nterm >= ep)
1584 m->m_len = cp - mtod(m, char *);
1588 panic("should not reach here");
1598 * check if two DNS-encoded string matches. takes care of truncated
1599 * form (with \0\0 at the end). no compression support.
1600 * XXX upper/lowercase match (see RFC2065)
1603 ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1605 const char *a0, *b0;
1608 /* simplest case - need validation? */
1609 if (alen == blen && bcmp(a, b, alen) == 0)
1615 /* termination is mandatory */
1616 if (alen < 2 || blen < 2)
1618 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1623 while (a - a0 < alen && b - b0 < blen) {
1624 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1627 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1629 /* we don't support compression yet */
1630 if (a[0] >= 64 || b[0] >= 64)
1633 /* truncated case */
1634 if (a[0] == 0 && a - a0 == alen - 1)
1636 if (b[0] == 0 && b - b0 == blen - 1)
1638 if (a[0] == 0 || b[0] == 0)
1644 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1646 if (bcmp(a + 1, b + 1, l) != 0)
1653 if (a - a0 == alen && b - b0 == blen)
1660 * calculate the number of addresses to be returned in the node info reply.
1663 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1664 struct in6_addr *subj)
1667 struct in6_ifaddr *ifa6;
1669 int addrs = 0, addrsofif, iffound = 0;
1670 int niflags = ni6->ni_flags;
1672 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1673 switch (ni6->ni_code) {
1674 case ICMP6_NI_SUBJ_IPV6:
1675 if (subj == NULL) /* must be impossible... */
1680 * XXX: we only support IPv6 subject address for
1687 IFNET_RLOCK_NOSLEEP();
1688 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1691 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1692 if (ifa->ifa_addr->sa_family != AF_INET6)
1694 ifa6 = (struct in6_ifaddr *)ifa;
1696 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1697 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1701 * IPv4-mapped addresses can only be returned by a
1702 * Node Information proxy, since they represent
1703 * addresses of IPv4-only nodes, which perforce do
1704 * not implement this protocol.
1705 * [icmp-name-lookups-07, Section 5.4]
1706 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1707 * this function at this moment.
1710 /* What do we have to do about ::1? */
1711 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1712 case IPV6_ADDR_SCOPE_LINKLOCAL:
1713 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1716 case IPV6_ADDR_SCOPE_SITELOCAL:
1717 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1720 case IPV6_ADDR_SCOPE_GLOBAL:
1721 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1729 * check if anycast is okay.
1730 * XXX: just experimental. not in the spec.
1732 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1733 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1734 continue; /* we need only unicast addresses */
1735 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1736 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1739 addrsofif++; /* count the address */
1741 IF_ADDR_RUNLOCK(ifp);
1744 IFNET_RUNLOCK_NOSLEEP();
1750 IFNET_RUNLOCK_NOSLEEP();
1756 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1757 struct ifnet *ifp0, int resid)
1760 struct in6_ifaddr *ifa6;
1762 struct ifnet *ifp_dep = NULL;
1763 int copied = 0, allow_deprecated = 0;
1764 u_char *cp = (u_char *)(nni6 + 1);
1765 int niflags = ni6->ni_flags;
1768 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1769 return (0); /* needless to copy */
1771 IFNET_RLOCK_NOSLEEP();
1772 ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
1775 for (; ifp; ifp = TAILQ_NEXT(ifp, if_link)) {
1777 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1778 if (ifa->ifa_addr->sa_family != AF_INET6)
1780 ifa6 = (struct in6_ifaddr *)ifa;
1782 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1783 allow_deprecated == 0) {
1785 * prefererred address should be put before
1786 * deprecated addresses.
1789 /* record the interface for later search */
1790 if (ifp_dep == NULL)
1794 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1795 allow_deprecated != 0)
1796 continue; /* we now collect deprecated addrs */
1798 /* What do we have to do about ::1? */
1799 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1800 case IPV6_ADDR_SCOPE_LINKLOCAL:
1801 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1804 case IPV6_ADDR_SCOPE_SITELOCAL:
1805 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1808 case IPV6_ADDR_SCOPE_GLOBAL:
1809 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1817 * check if anycast is okay.
1818 * XXX: just experimental. not in the spec.
1820 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1821 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1823 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1824 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1828 /* now we can copy the address */
1829 if (resid < sizeof(struct in6_addr) +
1830 sizeof(u_int32_t)) {
1831 IF_ADDR_RUNLOCK(ifp);
1833 * We give up much more copy.
1834 * Set the truncate flag and return.
1836 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1837 IFNET_RUNLOCK_NOSLEEP();
1842 * Set the TTL of the address.
1843 * The TTL value should be one of the following
1844 * according to the specification:
1846 * 1. The remaining lifetime of a DHCP lease on the
1848 * 2. The remaining Valid Lifetime of a prefix from
1849 * which the address was derived through Stateless
1850 * Autoconfiguration.
1852 * Note that we currently do not support stateful
1853 * address configuration by DHCPv6, so the former
1854 * case can't happen.
1856 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1857 ltime = ND6_INFINITE_LIFETIME;
1859 if (ifa6->ia6_lifetime.ia6t_expire >
1861 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
1866 bcopy(<ime, cp, sizeof(u_int32_t));
1867 cp += sizeof(u_int32_t);
1869 /* copy the address itself */
1870 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1871 sizeof(struct in6_addr));
1872 in6_clearscope((struct in6_addr *)cp); /* XXX */
1873 cp += sizeof(struct in6_addr);
1875 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1876 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1878 IF_ADDR_RUNLOCK(ifp);
1879 if (ifp0) /* we need search only on the specified IF */
1883 if (allow_deprecated == 0 && ifp_dep != NULL) {
1885 allow_deprecated = 1;
1890 IFNET_RUNLOCK_NOSLEEP();
1896 * XXX almost dup'ed code with rip6_input.
1899 icmp6_rip6_input(struct mbuf **mp, int off)
1901 struct mbuf *m = *mp;
1902 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1904 struct inpcb *last = NULL;
1905 struct sockaddr_in6 fromsa;
1906 struct icmp6_hdr *icmp6;
1907 struct mbuf *opts = NULL;
1909 #ifndef PULLDOWN_TEST
1910 /* this is assumed to be safe. */
1911 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1913 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1914 if (icmp6 == NULL) {
1915 /* m is already reclaimed */
1916 return (IPPROTO_DONE);
1921 * XXX: the address may have embedded scope zone ID, which should be
1922 * hidden from applications.
1924 bzero(&fromsa, sizeof(fromsa));
1925 fromsa.sin6_family = AF_INET6;
1926 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1927 fromsa.sin6_addr = ip6->ip6_src;
1928 if (sa6_recoverscope(&fromsa)) {
1930 return (IPPROTO_DONE);
1933 INP_INFO_RLOCK(&V_ripcbinfo);
1934 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
1935 if ((in6p->inp_vflag & INP_IPV6) == 0)
1937 if (in6p->inp_ip_p != IPPROTO_ICMPV6)
1939 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1940 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1942 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1943 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1946 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1947 in6p->in6p_icmp6filt)) {
1952 struct mbuf *n = NULL;
1955 * Recent network drivers tend to allocate a single
1956 * mbuf cluster, rather than to make a couple of
1957 * mbufs without clusters. Also, since the IPv6 code
1958 * path tries to avoid m_pullup(), it is highly
1959 * probable that we still have an mbuf cluster here
1960 * even though the necessary length can be stored in an
1961 * mbuf's internal buffer.
1962 * Meanwhile, the default size of the receive socket
1963 * buffer for raw sockets is not so large. This means
1964 * the possibility of packet loss is relatively higher
1965 * than before. To avoid this scenario, we copy the
1966 * received data to a separate mbuf that does not use
1967 * a cluster, if possible.
1968 * XXX: it is better to copy the data after stripping
1969 * intermediate headers.
1971 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1972 m->m_len <= MHLEN) {
1973 n = m_get(M_NOWAIT, m->m_type);
1975 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1976 bcopy(m->m_data, n->m_data,
1978 n->m_len = m->m_len;
1986 (n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
1987 if (last->inp_flags & INP_CONTROLOPTS)
1988 ip6_savecontrol(last, n, &opts);
1989 /* strip intermediate headers */
1991 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
1992 if (sbappendaddr_locked(
1993 &last->inp_socket->so_rcv,
1994 (struct sockaddr *)&fromsa, n, opts)
1996 /* should notify about lost packet */
2002 &last->inp_socket->so_rcv);
2004 sorwakeup_locked(last->inp_socket);
2011 INP_INFO_RUNLOCK(&V_ripcbinfo);
2013 if (last->inp_flags & INP_CONTROLOPTS)
2014 ip6_savecontrol(last, m, &opts);
2015 /* strip intermediate headers */
2018 /* avoid using mbuf clusters if possible (see above) */
2019 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2020 m->m_len <= MHLEN) {
2023 n = m_get(M_NOWAIT, m->m_type);
2025 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2026 bcopy(m->m_data, n->m_data, m->m_len);
2027 n->m_len = m->m_len;
2037 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2038 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
2039 (struct sockaddr *)&fromsa, m, opts) == 0) {
2043 SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
2045 sorwakeup_locked(last->inp_socket);
2049 IP6STAT_DEC(ip6s_delivered);
2051 return IPPROTO_DONE;
2055 * Reflect the ip6 packet back to the source.
2056 * OFF points to the icmp6 header, counted from the top of the mbuf.
2059 icmp6_reflect(struct mbuf *m, size_t off)
2061 struct in6_addr src6, *srcp;
2062 struct ip6_hdr *ip6;
2063 struct icmp6_hdr *icmp6;
2064 struct in6_ifaddr *ia = NULL;
2065 struct ifnet *outif = NULL;
2067 int type, code, hlim;
2069 /* too short to reflect */
2070 if (off < sizeof(struct ip6_hdr)) {
2072 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2073 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2074 __FILE__, __LINE__));
2079 * If there are extra headers between IPv6 and ICMPv6, strip
2080 * off that header first.
2083 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2084 panic("assumption failed in icmp6_reflect");
2086 if (off > sizeof(struct ip6_hdr)) {
2088 struct ip6_hdr nip6;
2090 l = off - sizeof(struct ip6_hdr);
2091 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2093 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2095 if ((m = m_pullup(m, l)) == NULL)
2098 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2099 } else /* off == sizeof(struct ip6_hdr) */ {
2101 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2103 if ((m = m_pullup(m, l)) == NULL)
2107 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2108 ip6 = mtod(m, struct ip6_hdr *);
2109 ip6->ip6_nxt = IPPROTO_ICMPV6;
2110 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2111 type = icmp6->icmp6_type; /* keep type for statistics */
2112 code = icmp6->icmp6_code; /* ditto. */
2117 * If the incoming packet was addressed directly to us (i.e. unicast),
2118 * use dst as the src for the reply.
2119 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2120 * (for example) when we encounter an error while forwarding procedure
2121 * destined to a duplicated address of ours.
2123 if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
2124 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
2125 if (ia != NULL && !(ia->ia6_flags &
2126 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2127 src6 = ia->ia_addr.sin6_addr;
2130 if (m->m_pkthdr.rcvif != NULL) {
2131 /* XXX: This may not be the outgoing interface */
2132 hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2134 hlim = V_ip6_defhlim;
2137 ifa_free(&ia->ia_ifa);
2142 struct in6_addr dst6;
2146 * This case matches to multicasts, our anycast, or unicasts
2147 * that we do not own. Select a source address based on the
2148 * source address of the erroneous packet.
2150 in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
2151 error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
2152 scopeid, NULL, &src6, &hlim);
2155 char ip6buf[INET6_ADDRSTRLEN];
2157 "icmp6_reflect: source can't be determined: "
2158 "dst=%s, error=%d\n",
2159 ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
2165 * ip6_input() drops a packet if its src is multicast.
2166 * So, the src is never multicast.
2168 ip6->ip6_dst = ip6->ip6_src;
2169 ip6->ip6_src = *srcp;
2171 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2172 ip6->ip6_vfc |= IPV6_VERSION;
2173 ip6->ip6_nxt = IPPROTO_ICMPV6;
2174 ip6->ip6_hlim = hlim;
2176 icmp6->icmp6_cksum = 0;
2177 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2178 sizeof(struct ip6_hdr), plen);
2181 * XXX option handling
2184 m->m_flags &= ~(M_BCAST|M_MCAST);
2186 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2188 icmp6_ifoutstat_inc(outif, type, code);
2198 icmp6_fasttimo(void)
2205 icmp6_slowtimo(void)
2212 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2213 struct in6_addr *tgt6)
2215 static char buf[1024];
2216 char ip6bufs[INET6_ADDRSTRLEN];
2217 char ip6bufd[INET6_ADDRSTRLEN];
2218 char ip6buft[INET6_ADDRSTRLEN];
2219 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2220 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2221 ip6_sprintf(ip6buft, tgt6));
2226 icmp6_redirect_input(struct mbuf *m, int off)
2229 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2230 struct nd_redirect *nd_rd;
2231 int icmp6len = ntohs(ip6->ip6_plen);
2232 char *lladdr = NULL;
2236 struct in6_addr src6 = ip6->ip6_src;
2237 struct in6_addr redtgt6;
2238 struct in6_addr reddst6;
2239 union nd_opts ndopts;
2240 char ip6buf[INET6_ADDRSTRLEN];
2243 KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
2245 ifp = m->m_pkthdr.rcvif;
2247 /* XXX if we are router, we don't update route by icmp6 redirect */
2248 if (V_ip6_forwarding)
2250 if (!V_icmp6_rediraccept)
2253 #ifndef PULLDOWN_TEST
2254 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2255 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2257 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2258 if (nd_rd == NULL) {
2259 ICMP6STAT_INC(icp6s_tooshort);
2263 redtgt6 = nd_rd->nd_rd_target;
2264 reddst6 = nd_rd->nd_rd_dst;
2266 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2267 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2272 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2274 "ICMP6 redirect sent from %s rejected; "
2275 "must be from linklocal\n",
2276 ip6_sprintf(ip6buf, &src6)));
2279 if (ip6->ip6_hlim != 255) {
2281 "ICMP6 redirect sent from %s rejected; "
2282 "hlim=%d (must be 255)\n",
2283 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2287 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2288 struct nhop6_basic nh6;
2289 struct in6_addr kdst;
2292 in6_splitscope(&reddst6, &kdst, &scopeid);
2293 if (fib6_lookup_nh_basic(ifp->if_fib, &kdst, scopeid, 0, 0,&nh6)==0){
2294 if ((nh6.nh_flags & NHF_GATEWAY) == 0) {
2296 "ICMP6 redirect rejected; no route "
2297 "with inet6 gateway found for redirect dst: %s\n",
2298 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2302 if (IN6_ARE_ADDR_EQUAL(&src6, &nh6.nh_addr) == 0) {
2304 "ICMP6 redirect rejected; "
2305 "not equal to gw-for-src=%s (must be same): "
2307 ip6_sprintf(ip6buf, &nh6.nh_addr),
2308 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2313 "ICMP6 redirect rejected; "
2314 "no route found for redirect dst: %s\n",
2315 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2319 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2321 "ICMP6 redirect rejected; "
2322 "redirect dst must be unicast: %s\n",
2323 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2327 is_router = is_onlink = 0;
2328 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2329 is_router = 1; /* router case */
2330 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2331 is_onlink = 1; /* on-link destination case */
2332 if (!is_router && !is_onlink) {
2334 "ICMP6 redirect rejected; "
2335 "neither router case nor onlink case: %s\n",
2336 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2340 icmp6len -= sizeof(*nd_rd);
2341 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2342 if (nd6_options(&ndopts) < 0) {
2343 nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
2344 __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2345 /* nd6_options have incremented stats */
2349 if (ndopts.nd_opts_tgt_lladdr) {
2350 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2351 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2354 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2355 nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
2356 "(if %d, icmp6 packet %d): %s\n",
2357 __func__, ip6_sprintf(ip6buf, &redtgt6),
2358 ifp->if_addrlen, lladdrlen - 2,
2359 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2363 /* Validation passed. */
2366 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2367 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2370 * Install a gateway route in the better-router case or an interface
2371 * route in the on-link-destination case.
2374 struct sockaddr_in6 sdst;
2375 struct sockaddr_in6 sgw;
2376 struct sockaddr_in6 ssrc;
2377 struct sockaddr *gw;
2381 bzero(&sdst, sizeof(sdst));
2382 bzero(&ssrc, sizeof(ssrc));
2383 sdst.sin6_family = ssrc.sin6_family = AF_INET6;
2384 sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
2385 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2386 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2387 rt_flags = RTF_HOST;
2389 bzero(&sgw, sizeof(sgw));
2390 sgw.sin6_family = AF_INET6;
2391 sgw.sin6_len = sizeof(struct sockaddr_in6);
2392 bcopy(&redtgt6, &sgw.sin6_addr,
2393 sizeof(struct in6_addr));
2394 gw = (struct sockaddr *)&sgw;
2395 rt_flags |= RTF_GATEWAY;
2397 gw = ifp->if_addr->ifa_addr;
2398 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
2399 in6_rtredirect((struct sockaddr *)&sdst, gw,
2400 (struct sockaddr *)NULL, rt_flags,
2401 (struct sockaddr *)&ssrc, fibnum);
2403 /* finally update cached route in each socket via pfctlinput */
2405 struct sockaddr_in6 sdst;
2407 bzero(&sdst, sizeof(sdst));
2408 sdst.sin6_family = AF_INET6;
2409 sdst.sin6_len = sizeof(struct sockaddr_in6);
2410 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2411 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2419 ICMP6STAT_INC(icp6s_badredirect);
2424 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2426 struct ifnet *ifp; /* my outgoing interface */
2427 struct in6_addr *ifp_ll6;
2428 struct in6_addr *router_ll6;
2429 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2430 struct mbuf *m = NULL; /* newly allocated one */
2432 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2433 struct nd_redirect *nd_rd;
2434 struct llentry *ln = NULL;
2437 struct ifnet *outif = NULL;
2438 struct sockaddr_in6 src_sa;
2440 icmp6_errcount(ND_REDIRECT, 0);
2442 /* if we are not router, we don't send icmp6 redirect */
2443 if (!V_ip6_forwarding)
2447 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2452 * the source address must identify a neighbor, and
2453 * the destination address must not be a multicast address
2454 * [RFC 2461, sec 8.2]
2456 sip6 = mtod(m0, struct ip6_hdr *);
2457 bzero(&src_sa, sizeof(src_sa));
2458 src_sa.sin6_family = AF_INET6;
2459 src_sa.sin6_len = sizeof(src_sa);
2460 src_sa.sin6_addr = sip6->ip6_src;
2461 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2463 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2464 goto fail; /* what should we do here? */
2467 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2471 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2472 * we almost always ask for an mbuf cluster for simplicity.
2473 * (MHLEN < IPV6_MMTU is almost always true)
2475 #if IPV6_MMTU >= MCLBYTES
2476 # error assumption failed about IPV6_MMTU and MCLBYTES
2478 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
2481 M_SETFIB(m, rt->rt_fibnum);
2482 maxlen = M_TRAILINGSPACE(m);
2483 maxlen = min(IPV6_MMTU, maxlen);
2484 /* just for safety */
2485 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2486 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2491 /* get ip6 linklocal address for ifp(my outgoing interface). */
2492 struct in6_ifaddr *ia;
2493 if ((ia = in6ifa_ifpforlinklocal(ifp,
2495 IN6_IFF_ANYCAST)) == NULL)
2497 ifp_ll6 = &ia->ia_addr.sin6_addr;
2498 /* XXXRW: reference released prematurely. */
2499 ifa_free(&ia->ia_ifa);
2502 /* get ip6 linklocal address for the router. */
2503 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2504 struct sockaddr_in6 *sin6;
2505 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2506 router_ll6 = &sin6->sin6_addr;
2507 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2508 router_ll6 = (struct in6_addr *)NULL;
2510 router_ll6 = (struct in6_addr *)NULL;
2513 ip6 = mtod(m, struct ip6_hdr *);
2515 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2516 ip6->ip6_vfc |= IPV6_VERSION;
2517 /* ip6->ip6_plen will be set later */
2518 ip6->ip6_nxt = IPPROTO_ICMPV6;
2519 ip6->ip6_hlim = 255;
2520 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2521 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2522 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2525 nd_rd = (struct nd_redirect *)(ip6 + 1);
2526 nd_rd->nd_rd_type = ND_REDIRECT;
2527 nd_rd->nd_rd_code = 0;
2528 nd_rd->nd_rd_reserved = 0;
2529 if (rt->rt_flags & RTF_GATEWAY) {
2531 * nd_rd->nd_rd_target must be a link-local address in
2532 * better router cases.
2536 bcopy(router_ll6, &nd_rd->nd_rd_target,
2537 sizeof(nd_rd->nd_rd_target));
2538 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2539 sizeof(nd_rd->nd_rd_dst));
2541 /* make sure redtgt == reddst */
2542 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2543 sizeof(nd_rd->nd_rd_target));
2544 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2545 sizeof(nd_rd->nd_rd_dst));
2548 p = (u_char *)(nd_rd + 1);
2554 /* target lladdr option */
2556 struct nd_opt_hdr *nd_opt;
2559 IF_AFDATA_RLOCK(ifp);
2560 ln = nd6_lookup(router_ll6, 0, ifp);
2561 IF_AFDATA_RUNLOCK(ifp);
2565 len = sizeof(*nd_opt) + ifp->if_addrlen;
2566 len = (len + 7) & ~7; /* round by 8 */
2568 if (len + (p - (u_char *)ip6) > maxlen)
2571 if (ln->la_flags & LLE_VALID) {
2572 nd_opt = (struct nd_opt_hdr *)p;
2573 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2574 nd_opt->nd_opt_len = len >> 3;
2575 lladdr = (char *)(nd_opt + 1);
2576 bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
2584 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2586 /* just to be safe */
2587 #ifdef M_DECRYPTED /*not openbsd*/
2588 if (m0->m_flags & M_DECRYPTED)
2591 if (p - (u_char *)ip6 > maxlen)
2595 /* redirected header option */
2597 struct nd_opt_rd_hdr *nd_opt_rh;
2600 * compute the maximum size for icmp6 redirect header option.
2601 * XXX room for auth header?
2603 len = maxlen - (p - (u_char *)ip6);
2606 /* This is just for simplicity. */
2607 if (m0->m_pkthdr.len != m0->m_len) {
2609 m_freem(m0->m_next);
2612 m0->m_pkthdr.len = m0->m_len;
2616 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2617 * about padding/truncate rule for the original IP packet.
2618 * From the discussion on IPv6imp in Feb 1999,
2619 * the consensus was:
2620 * - "attach as much as possible" is the goal
2621 * - pad if not aligned (original size can be guessed by
2622 * original ip6 header)
2623 * Following code adds the padding if it is simple enough,
2624 * and truncates if not.
2626 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2627 panic("assumption failed in %s:%d", __FILE__,
2630 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2631 /* not enough room, truncate */
2632 m0->m_pkthdr.len = m0->m_len = len -
2635 /* enough room, pad or truncate */
2638 extra = m0->m_pkthdr.len % 8;
2640 /* pad if easy enough, truncate if not */
2641 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2643 m0->m_len += (8 - extra);
2644 m0->m_pkthdr.len += (8 - extra);
2647 m0->m_pkthdr.len -= extra;
2651 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2652 m0->m_pkthdr.len = m0->m_len = len -
2656 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2657 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2658 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2659 nd_opt_rh->nd_opt_rh_len = len >> 3;
2660 p += sizeof(*nd_opt_rh);
2661 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2663 /* connect m0 to m */
2664 m_tag_delete_chain(m0, NULL);
2665 m0->m_flags &= ~M_PKTHDR;
2667 m->m_pkthdr.len = m->m_len + m0->m_len;
2676 /* XXX: clear embedded link IDs in the inner header */
2677 in6_clearscope(&sip6->ip6_src);
2678 in6_clearscope(&sip6->ip6_dst);
2679 in6_clearscope(&nd_rd->nd_rd_target);
2680 in6_clearscope(&nd_rd->nd_rd_dst);
2682 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2684 nd_rd->nd_rd_cksum = 0;
2685 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2686 sizeof(*ip6), ntohs(ip6->ip6_plen));
2688 if (send_sendso_input_hook != NULL) {
2689 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
2693 *(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
2694 m_tag_prepend(m, mtag);
2697 /* send the packet to outside... */
2698 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2700 icmp6_ifstat_inc(outif, ifs6_out_msg);
2701 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2703 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2715 * ICMPv6 socket option processing.
2718 icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2722 struct inpcb *inp = sotoinpcb(so);
2723 int level, op, optname;
2726 level = sopt->sopt_level;
2727 op = sopt->sopt_dir;
2728 optname = sopt->sopt_name;
2729 optlen = sopt->sopt_valsize;
2731 level = op = optname = optlen = 0;
2733 if (level != IPPROTO_ICMPV6) {
2742 struct icmp6_filter ic6f;
2744 if (optlen != sizeof(ic6f)) {
2748 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2751 *inp->in6p_icmp6filt = ic6f;
2758 error = ENOPROTOOPT;
2767 struct icmp6_filter ic6f;
2770 ic6f = *inp->in6p_icmp6filt;
2772 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2777 error = ENOPROTOOPT;
2787 * Perform rate limit check.
2788 * Returns 0 if it is okay to send the icmp6 packet.
2789 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2792 * XXX per-destination/type check necessary?
2794 * dst - not used at this moment
2795 * type - not used at this moment
2796 * code - not used at this moment
2799 icmp6_ratelimit(const struct in6_addr *dst, const int type,
2804 ret = 0; /* okay to send */
2807 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2808 V_icmp6errppslim)) {
2809 /* The packet is subject to rate limit */