1 /* $FreeBSD: releng/6.3/sys/netinet6/ip6_forward.c 162254 2006-09-12 17:54:58Z jhay $ */
2 /* $KAME: ip6_forward.c,v 1.69 2001/05/17 03:48:30 itojun Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "opt_ip6fw.h"
34 #include "opt_inet.h"
35 #include "opt_inet6.h"
36 #include "opt_ipsec.h"
37 #include "opt_ipstealth.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
42 #include <sys/mbuf.h>
43 #include <sys/domain.h>
44 #include <sys/protosw.h>
45 #include <sys/socket.h>
46 #include <sys/errno.h>
47 #include <sys/time.h>
48 #include <sys/kernel.h>
49 #include <sys/syslog.h>
50
51 #include <net/if.h>
52 #include <net/route.h>
53 #include <net/pfil.h>
54
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/ip.h>
59 #include <netinet/ip_var.h>
60 #include <netinet6/in6_var.h>
61 #include <netinet/ip6.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/scope6_var.h>
64 #include <netinet/icmp6.h>
65 #include <netinet6/nd6.h>
66
67 #include <netinet/in_pcb.h>
68
69 #ifdef IPSEC
70 #include <netinet6/ipsec.h>
71 #ifdef INET6
72 #include <netinet6/ipsec6.h>
73 #endif
74 #include <netkey/key.h>
75 #endif /* IPSEC */
76
77 #ifdef FAST_IPSEC
78 #include <netipsec/ipsec.h>
79 #include <netipsec/ipsec6.h>
80 #include <netipsec/key.h>
81 #define IPSEC
82 #endif /* FAST_IPSEC */
83
84 #include <netinet6/ip6_fw.h>
85
86 #include <net/net_osdep.h>
87
88 #include <netinet6/ip6protosw.h>
89
90 struct route_in6 ip6_forward_rt;
91
92 /*
93 * Forward a packet. If some error occurs return the sender
94 * an icmp packet. Note we can't always generate a meaningful
95 * icmp message because icmp doesn't have a large enough repertoire
96 * of codes and types.
97 *
98 * If not forwarding, just drop the packet. This could be confusing
99 * if ipforwarding was zero but some routing protocol was advancing
100 * us as a gateway to somewhere. However, we must let the routing
101 * protocol deal with that.
102 *
103 */
104
105 void
106 ip6_forward(m, srcrt)
107 struct mbuf *m;
108 int srcrt;
109 {
110 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
111 struct sockaddr_in6 *dst = NULL;
112 struct rtentry *rt = NULL;
113 int error, type = 0, code = 0;
114 struct mbuf *mcopy = NULL;
115 struct ifnet *origifp; /* maybe unnecessary */
116 u_int32_t inzone, outzone;
117 struct in6_addr src_in6, dst_in6;
118 #ifdef IPSEC
119 struct secpolicy *sp = NULL;
120 int ipsecrt = 0;
121 #endif
122
123 #ifdef IPSEC
124 /*
125 * Check AH/ESP integrity.
126 */
127 /*
128 * Don't increment ip6s_cantforward because this is the check
129 * before forwarding packet actually.
130 */
131 if (ipsec6_in_reject(m, NULL)) {
132 #if !defined(FAST_IPSEC)
133 ipsec6stat.in_polvio++;
134 #endif
135 m_freem(m);
136 return;
137 }
138 #endif /* IPSEC */
139
140 /*
141 * Do not forward packets to multicast destination (should be handled
142 * by ip6_mforward().
143 * Do not forward packets with unspecified source. It was discussed
144 * in July 2000, on the ipngwg mailing list.
145 */
146 if ((m->m_flags & (M_BCAST|M_MCAST)) != 0 ||
147 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
148 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
149 ip6stat.ip6s_cantforward++;
150 /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
151 if (ip6_log_time + ip6_log_interval < time_second) {
152 ip6_log_time = time_second;
153 log(LOG_DEBUG,
154 "cannot forward "
155 "from %s to %s nxt %d received on %s\n",
156 ip6_sprintf(&ip6->ip6_src),
157 ip6_sprintf(&ip6->ip6_dst),
158 ip6->ip6_nxt,
159 if_name(m->m_pkthdr.rcvif));
160 }
161 m_freem(m);
162 return;
163 }
164
165 #ifdef IPSTEALTH
166 if (!ip6stealth) {
167 #endif
168 if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
169 /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
170 icmp6_error(m, ICMP6_TIME_EXCEEDED,
171 ICMP6_TIME_EXCEED_TRANSIT, 0);
172 return;
173 }
174 ip6->ip6_hlim -= IPV6_HLIMDEC;
175
176 #ifdef IPSTEALTH
177 }
178 #endif
179
180 /*
181 * Save at most ICMPV6_PLD_MAXLEN (= the min IPv6 MTU -
182 * size of IPv6 + ICMPv6 headers) bytes of the packet in case
183 * we need to generate an ICMP6 message to the src.
184 * Thanks to M_EXT, in most cases copy will not occur.
185 *
186 * It is important to save it before IPsec processing as IPsec
187 * processing may modify the mbuf.
188 */
189 mcopy = m_copy(m, 0, imin(m->m_pkthdr.len, ICMPV6_PLD_MAXLEN));
190
191 #ifdef IPSEC
192 /* get a security policy for this packet */
193 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND,
194 IP_FORWARDING, &error);
195 if (sp == NULL) {
196 ipsec6stat.out_inval++;
197 ip6stat.ip6s_cantforward++;
198 if (mcopy) {
199 #if 0
200 /* XXX: what icmp ? */
201 #else
202 m_freem(mcopy);
203 #endif
204 }
205 m_freem(m);
206 return;
207 }
208
209 error = 0;
210
211 /* check policy */
212 switch (sp->policy) {
213 case IPSEC_POLICY_DISCARD:
214 /*
215 * This packet is just discarded.
216 */
217 ipsec6stat.out_polvio++;
218 ip6stat.ip6s_cantforward++;
219 key_freesp(sp);
220 if (mcopy) {
221 #if 0
222 /* XXX: what icmp ? */
223 #else
224 m_freem(mcopy);
225 #endif
226 }
227 m_freem(m);
228 return;
229
230 case IPSEC_POLICY_BYPASS:
231 case IPSEC_POLICY_NONE:
232 /* no need to do IPsec. */
233 key_freesp(sp);
234 goto skip_ipsec;
235
236 case IPSEC_POLICY_IPSEC:
237 if (sp->req == NULL) {
238 /* XXX should be panic ? */
239 printf("ip6_forward: No IPsec request specified.\n");
240 ip6stat.ip6s_cantforward++;
241 key_freesp(sp);
242 if (mcopy) {
243 #if 0
244 /* XXX: what icmp ? */
245 #else
246 m_freem(mcopy);
247 #endif
248 }
249 m_freem(m);
250 return;
251 }
252 /* do IPsec */
253 break;
254
255 case IPSEC_POLICY_ENTRUST:
256 default:
257 /* should be panic ?? */
258 printf("ip6_forward: Invalid policy found. %d\n", sp->policy);
259 key_freesp(sp);
260 goto skip_ipsec;
261 }
262
263 {
264 struct ipsecrequest *isr = NULL;
265 struct ipsec_output_state state;
266
267 /*
268 * when the kernel forwards a packet, it is not proper to apply
269 * IPsec transport mode to the packet is not proper. this check
270 * avoid from this.
271 * at present, if there is even a transport mode SA request in the
272 * security policy, the kernel does not apply IPsec to the packet.
273 * this check is not enough because the following case is valid.
274 * ipsec esp/tunnel/xxx-xxx/require esp/transport//require;
275 */
276 for (isr = sp->req; isr; isr = isr->next) {
277 if (isr->saidx.mode == IPSEC_MODE_ANY)
278 goto doipsectunnel;
279 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
280 goto doipsectunnel;
281 }
282
283 /*
284 * if there's no need for tunnel mode IPsec, skip.
285 */
286 if (!isr)
287 goto skip_ipsec;
288
289 doipsectunnel:
290 /*
291 * All the extension headers will become inaccessible
292 * (since they can be encrypted).
293 * Don't panic, we need no more updates to extension headers
294 * on inner IPv6 packet (since they are now encapsulated).
295 *
296 * IPv6 [ESP|AH] IPv6 [extension headers] payload
297 */
298 bzero(&state, sizeof(state));
299 state.m = m;
300 state.ro = NULL; /* update at ipsec6_output_tunnel() */
301 state.dst = NULL; /* update at ipsec6_output_tunnel() */
302
303 error = ipsec6_output_tunnel(&state, sp, 0);
304
305 m = state.m;
306 key_freesp(sp);
307
308 if (error) {
309 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
310 switch (error) {
311 case EHOSTUNREACH:
312 case ENETUNREACH:
313 case EMSGSIZE:
314 case ENOBUFS:
315 case ENOMEM:
316 break;
317 default:
318 printf("ip6_output (ipsec): error code %d\n", error);
319 /* FALLTHROUGH */
320 case ENOENT:
321 /* don't show these error codes to the user */
322 break;
323 }
324 ip6stat.ip6s_cantforward++;
325 if (mcopy) {
326 #if 0
327 /* XXX: what icmp ? */
328 #else
329 m_freem(mcopy);
330 #endif
331 }
332 m_freem(m);
333 return;
334 }
335
336 if (ip6 != mtod(m, struct ip6_hdr *)) {
337 /*
338 * now tunnel mode headers are added. we are originating
339 * packet instead of forwarding the packet.
340 */
341 ip6_output(m, NULL, NULL, IPV6_FORWARDING/*XXX*/, NULL, NULL,
342 NULL);
343 goto freecopy;
344 }
345
346 /* adjust pointer */
347 dst = (struct sockaddr_in6 *)state.dst;
348 rt = state.ro ? state.ro->ro_rt : NULL;
349 if (dst != NULL && rt != NULL)
350 ipsecrt = 1;
351 }
352 skip_ipsec:
353 #endif /* IPSEC */
354
355 #ifdef IPSEC
356 if (ipsecrt)
357 goto skip_routing;
358 #endif
359
360 dst = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
361 if (!srcrt) {
362 /* ip6_forward_rt.ro_dst.sin6_addr is equal to ip6->ip6_dst */
363 if (ip6_forward_rt.ro_rt == 0 ||
364 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) == 0) {
365 if (ip6_forward_rt.ro_rt) {
366 RTFREE(ip6_forward_rt.ro_rt);
367 ip6_forward_rt.ro_rt = 0;
368 }
369
370 /* this probably fails but give it a try again */
371 rtalloc((struct route *)&ip6_forward_rt);
372 }
373
374 if (ip6_forward_rt.ro_rt == 0) {
375 ip6stat.ip6s_noroute++;
376 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
377 if (mcopy) {
378 icmp6_error(mcopy, ICMP6_DST_UNREACH,
379 ICMP6_DST_UNREACH_NOROUTE, 0);
380 }
381 m_freem(m);
382 return;
383 }
384 } else if ((rt = ip6_forward_rt.ro_rt) == 0 ||
385 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) {
386 if (ip6_forward_rt.ro_rt) {
387 RTFREE(ip6_forward_rt.ro_rt);
388 ip6_forward_rt.ro_rt = 0;
389 }
390 bzero(dst, sizeof(*dst));
391 dst->sin6_len = sizeof(struct sockaddr_in6);
392 dst->sin6_family = AF_INET6;
393 dst->sin6_addr = ip6->ip6_dst;
394
395 rtalloc((struct route *)&ip6_forward_rt);
396 if (ip6_forward_rt.ro_rt == 0) {
397 ip6stat.ip6s_noroute++;
398 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
399 if (mcopy) {
400 icmp6_error(mcopy, ICMP6_DST_UNREACH,
401 ICMP6_DST_UNREACH_NOROUTE, 0);
402 }
403 m_freem(m);
404 return;
405 }
406 }
407 rt = ip6_forward_rt.ro_rt;
408 #ifdef IPSEC
409 skip_routing:;
410 #endif
411
412 /*
413 * Source scope check: if a packet can't be delivered to its
414 * destination for the reason that the destination is beyond the scope
415 * of the source address, discard the packet and return an icmp6
416 * destination unreachable error with Code 2 (beyond scope of source
417 * address). We use a local copy of ip6_src, since in6_setscope()
418 * will possibly modify its first argument.
419 * [draft-ietf-ipngwg-icmp-v3-04.txt, Section 3.1]
420 */
421 src_in6 = ip6->ip6_src;
422 if (in6_setscope(&src_in6, rt->rt_ifp, &outzone)) {
423 /* XXX: this should not happen */
424 ip6stat.ip6s_cantforward++;
425 ip6stat.ip6s_badscope++;
426 m_freem(m);
427 return;
428 }
429 if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
430 ip6stat.ip6s_cantforward++;
431 ip6stat.ip6s_badscope++;
432 m_freem(m);
433 return;
434 }
435 if (inzone != outzone
436 #ifdef IPSEC
437 && !ipsecrt
438 #endif
439 ) {
440 ip6stat.ip6s_cantforward++;
441 ip6stat.ip6s_badscope++;
442 in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
443
444 if (ip6_log_time + ip6_log_interval < time_second) {
445 ip6_log_time = time_second;
446 log(LOG_DEBUG,
447 "cannot forward "
448 "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
449 ip6_sprintf(&ip6->ip6_src),
450 ip6_sprintf(&ip6->ip6_dst),
451 ip6->ip6_nxt,
452 if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
453 }
454 if (mcopy)
455 icmp6_error(mcopy, ICMP6_DST_UNREACH,
456 ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
457 m_freem(m);
458 return;
459 }
460
461 /*
462 * Destination scope check: if a packet is going to break the scope
463 * zone of packet's destination address, discard it. This case should
464 * usually be prevented by appropriately-configured routing table, but
465 * we need an explicit check because we may mistakenly forward the
466 * packet to a different zone by (e.g.) a default route.
467 */
468 dst_in6 = ip6->ip6_dst;
469 if (in6_setscope(&dst_in6, m->m_pkthdr.rcvif, &inzone) != 0 ||
470 in6_setscope(&dst_in6, rt->rt_ifp, &outzone) != 0 ||
471 inzone != outzone) {
472 ip6stat.ip6s_cantforward++;
473 ip6stat.ip6s_badscope++;
474 m_freem(m);
475 return;
476 }
477
478 if (m->m_pkthdr.len > IN6_LINKMTU(rt->rt_ifp)) {
479 in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
480 if (mcopy) {
481 u_long mtu;
482 #ifdef IPSEC
483 struct secpolicy *sp;
484 int ipsecerror;
485 size_t ipsechdrsiz;
486 #endif
487
488 mtu = IN6_LINKMTU(rt->rt_ifp);
489 #ifdef IPSEC
490 /*
491 * When we do IPsec tunnel ingress, we need to play
492 * with the link value (decrement IPsec header size
493 * from mtu value). The code is much simpler than v4
494 * case, as we have the outgoing interface for
495 * encapsulated packet as "rt->rt_ifp".
496 */
497 sp = ipsec6_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND,
498 IP_FORWARDING, &ipsecerror);
499 if (sp) {
500 ipsechdrsiz = ipsec6_hdrsiz(mcopy,
501 IPSEC_DIR_OUTBOUND, NULL);
502 if (ipsechdrsiz < mtu)
503 mtu -= ipsechdrsiz;
504 }
505
506 /*
507 * if mtu becomes less than minimum MTU,
508 * tell minimum MTU (and I'll need to fragment it).
509 */
510 if (mtu < IPV6_MMTU)
511 mtu = IPV6_MMTU;
512 #endif
513 icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
514 }
515 m_freem(m);
516 return;
517 }
518
519 if (rt->rt_flags & RTF_GATEWAY)
520 dst = (struct sockaddr_in6 *)rt->rt_gateway;
521
522 /*
523 * If we are to forward the packet using the same interface
524 * as one we got the packet from, perhaps we should send a redirect
525 * to sender to shortcut a hop.
526 * Only send redirect if source is sending directly to us,
527 * and if packet was not source routed (or has any options).
528 * Also, don't send redirect if forwarding using a route
529 * modified by a redirect.
530 */
531 if (ip6_sendredirects && rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
532 #ifdef IPSEC
533 !ipsecrt &&
534 #endif
535 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0) {
536 if ((rt->rt_ifp->if_flags & IFF_POINTOPOINT) != 0) {
537 /*
538 * If the incoming interface is equal to the outgoing
539 * one, and the link attached to the interface is
540 * point-to-point, then it will be highly probable
541 * that a routing loop occurs. Thus, we immediately
542 * drop the packet and send an ICMPv6 error message.
543 *
544 * type/code is based on suggestion by Rich Draves.
545 * not sure if it is the best pick.
546 */
547 icmp6_error(mcopy, ICMP6_DST_UNREACH,
548 ICMP6_DST_UNREACH_ADDR, 0);
549 m_freem(m);
550 return;
551 }
552 type = ND_REDIRECT;
553 }
554
555 /*
556 * Check with the firewall...
557 */
558 if (ip6_fw_enable && ip6_fw_chk_ptr) {
559 u_short port = 0;
560 /* If ipfw says divert, we have to just drop packet */
561 if ((*ip6_fw_chk_ptr)(&ip6, rt->rt_ifp, &port, &m)) {
562 m_freem(m);
563 goto freecopy;
564 }
565 if (!m)
566 goto freecopy;
567 }
568
569 /*
570 * Fake scoped addresses. Note that even link-local source or
571 * destinaion can appear, if the originating node just sends the
572 * packet to us (without address resolution for the destination).
573 * Since both icmp6_error and icmp6_redirect_output fill the embedded
574 * link identifiers, we can do this stuff after making a copy for
575 * returning an error.
576 */
577 if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
578 /*
579 * See corresponding comments in ip6_output.
580 * XXX: but is it possible that ip6_forward() sends a packet
581 * to a loopback interface? I don't think so, and thus
582 * I bark here. (jinmei@kame.net)
583 * XXX: it is common to route invalid packets to loopback.
584 * also, the codepath will be visited on use of ::1 in
585 * rthdr. (itojun)
586 */
587 #if 1
588 if (0)
589 #else
590 if ((rt->rt_flags & (RTF_BLACKHOLE|RTF_REJECT)) == 0)
591 #endif
592 {
593 printf("ip6_forward: outgoing interface is loopback. "
594 "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
595 ip6_sprintf(&ip6->ip6_src),
596 ip6_sprintf(&ip6->ip6_dst),
597 ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif),
598 if_name(rt->rt_ifp));
599 }
600
601 /* we can just use rcvif in forwarding. */
602 origifp = m->m_pkthdr.rcvif;
603 }
604 else
605 origifp = rt->rt_ifp;
606 /*
607 * clear embedded scope identifiers if necessary.
608 * in6_clearscope will touch the addresses only when necessary.
609 */
610 in6_clearscope(&ip6->ip6_src);
611 in6_clearscope(&ip6->ip6_dst);
612
613 /* Jump over all PFIL processing if hooks are not active. */
614 if (inet6_pfil_hook.ph_busy_count == -1)
615 goto pass;
616
617 /* Run through list of hooks for output packets. */
618 error = pfil_run_hooks(&inet6_pfil_hook, &m, rt->rt_ifp, PFIL_OUT, NULL);
619 if (error != 0)
620 goto senderr;
621 if (m == NULL)
622 goto freecopy;
623 ip6 = mtod(m, struct ip6_hdr *);
624
625 pass:
626 error = nd6_output(rt->rt_ifp, origifp, m, dst, rt);
627 if (error) {
628 in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
629 ip6stat.ip6s_cantforward++;
630 } else {
631 ip6stat.ip6s_forward++;
632 in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward);
633 if (type)
634 ip6stat.ip6s_redirectsent++;
635 else {
636 if (mcopy)
637 goto freecopy;
638 }
639 }
640
641 senderr:
642 if (mcopy == NULL)
643 return;
644 switch (error) {
645 case 0:
646 if (type == ND_REDIRECT) {
647 icmp6_redirect_output(mcopy, rt);
648 return;
649 }
650 goto freecopy;
651
652 case EMSGSIZE:
653 /* xxx MTU is constant in PPP? */
654 goto freecopy;
655
656 case ENOBUFS:
657 /* Tell source to slow down like source quench in IP? */
658 goto freecopy;
659
660 case ENETUNREACH: /* shouldn't happen, checked above */
661 case EHOSTUNREACH:
662 case ENETDOWN:
663 case EHOSTDOWN:
664 default:
665 type = ICMP6_DST_UNREACH;
666 code = ICMP6_DST_UNREACH_ADDR;
667 break;
668 }
669 icmp6_error(mcopy, type, code, 0);
670 return;
671
672 freecopy:
673 m_freem(mcopy);
674 return;
675 }
Cache object: 90c550345b727ffdfba4233fadf99a6c
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