1 /*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 *
29 * $KAME: ip6_forward.c,v 1.69 2001/05/17 03:48:30 itojun Exp $
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/6.4/sys/netinet6/ip6_forward.c 182649 2008-09-01 22:57:56Z obrien $");
34
35 #include "opt_ip6fw.h"
36 #include "opt_inet.h"
37 #include "opt_inet6.h"
38 #include "opt_ipsec.h"
39 #include "opt_ipstealth.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/domain.h>
46 #include <sys/protosw.h>
47 #include <sys/socket.h>
48 #include <sys/errno.h>
49 #include <sys/time.h>
50 #include <sys/kernel.h>
51 #include <sys/syslog.h>
52
53 #include <net/if.h>
54 #include <net/route.h>
55 #include <net/pfil.h>
56
57 #include <netinet/in.h>
58 #include <netinet/in_var.h>
59 #include <netinet/in_systm.h>
60 #include <netinet/ip.h>
61 #include <netinet/ip_var.h>
62 #include <netinet6/in6_var.h>
63 #include <netinet/ip6.h>
64 #include <netinet6/ip6_var.h>
65 #include <netinet6/scope6_var.h>
66 #include <netinet/icmp6.h>
67 #include <netinet6/nd6.h>
68
69 #include <netinet/in_pcb.h>
70
71 #ifdef IPSEC
72 #include <netinet6/ipsec.h>
73 #ifdef INET6
74 #include <netinet6/ipsec6.h>
75 #endif
76 #include <netkey/key.h>
77 #endif /* IPSEC */
78
79 #ifdef FAST_IPSEC
80 #include <netipsec/ipsec.h>
81 #include <netipsec/ipsec6.h>
82 #include <netipsec/key.h>
83 #define IPSEC
84 #endif /* FAST_IPSEC */
85
86 #include <netinet6/ip6_fw.h>
87
88 #include <net/net_osdep.h>
89
90 #include <netinet6/ip6protosw.h>
91
92 struct route_in6 ip6_forward_rt;
93
94 /*
95 * Forward a packet. If some error occurs return the sender
96 * an icmp packet. Note we can't always generate a meaningful
97 * icmp message because icmp doesn't have a large enough repertoire
98 * of codes and types.
99 *
100 * If not forwarding, just drop the packet. This could be confusing
101 * if ipforwarding was zero but some routing protocol was advancing
102 * us as a gateway to somewhere. However, we must let the routing
103 * protocol deal with that.
104 *
105 */
106
107 void
108 ip6_forward(m, srcrt)
109 struct mbuf *m;
110 int srcrt;
111 {
112 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
113 struct sockaddr_in6 *dst = NULL;
114 struct rtentry *rt = NULL;
115 int error, type = 0, code = 0;
116 struct mbuf *mcopy = NULL;
117 struct ifnet *origifp; /* maybe unnecessary */
118 u_int32_t inzone, outzone;
119 struct in6_addr src_in6, dst_in6;
120 #ifdef IPSEC
121 struct secpolicy *sp = NULL;
122 int ipsecrt = 0;
123 #endif
124
125 #ifdef IPSEC
126 /*
127 * Check AH/ESP integrity.
128 */
129 /*
130 * Don't increment ip6s_cantforward because this is the check
131 * before forwarding packet actually.
132 */
133 if (ipsec6_in_reject(m, NULL)) {
134 #if !defined(FAST_IPSEC)
135 ipsec6stat.in_polvio++;
136 #endif
137 m_freem(m);
138 return;
139 }
140 #endif /* IPSEC */
141
142 /*
143 * Do not forward packets to multicast destination (should be handled
144 * by ip6_mforward().
145 * Do not forward packets with unspecified source. It was discussed
146 * in July 2000, on the ipngwg mailing list.
147 */
148 if ((m->m_flags & (M_BCAST|M_MCAST)) != 0 ||
149 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
150 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
151 ip6stat.ip6s_cantforward++;
152 /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
153 if (ip6_log_time + ip6_log_interval < time_second) {
154 ip6_log_time = time_second;
155 log(LOG_DEBUG,
156 "cannot forward "
157 "from %s to %s nxt %d received on %s\n",
158 ip6_sprintf(&ip6->ip6_src),
159 ip6_sprintf(&ip6->ip6_dst),
160 ip6->ip6_nxt,
161 if_name(m->m_pkthdr.rcvif));
162 }
163 m_freem(m);
164 return;
165 }
166
167 #ifdef IPSTEALTH
168 if (!ip6stealth) {
169 #endif
170 if (ip6->ip6_hlim <= IPV6_HLIMDEC) {
171 /* XXX in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard) */
172 icmp6_error(m, ICMP6_TIME_EXCEEDED,
173 ICMP6_TIME_EXCEED_TRANSIT, 0);
174 return;
175 }
176 ip6->ip6_hlim -= IPV6_HLIMDEC;
177
178 #ifdef IPSTEALTH
179 }
180 #endif
181
182 /*
183 * Save at most ICMPV6_PLD_MAXLEN (= the min IPv6 MTU -
184 * size of IPv6 + ICMPv6 headers) bytes of the packet in case
185 * we need to generate an ICMP6 message to the src.
186 * Thanks to M_EXT, in most cases copy will not occur.
187 *
188 * It is important to save it before IPsec processing as IPsec
189 * processing may modify the mbuf.
190 */
191 mcopy = m_copy(m, 0, imin(m->m_pkthdr.len, ICMPV6_PLD_MAXLEN));
192
193 #ifdef IPSEC
194 /* get a security policy for this packet */
195 sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND,
196 IP_FORWARDING, &error);
197 if (sp == NULL) {
198 ipsec6stat.out_inval++;
199 ip6stat.ip6s_cantforward++;
200 if (mcopy) {
201 #if 0
202 /* XXX: what icmp ? */
203 #else
204 m_freem(mcopy);
205 #endif
206 }
207 m_freem(m);
208 return;
209 }
210
211 error = 0;
212
213 /* check policy */
214 switch (sp->policy) {
215 case IPSEC_POLICY_DISCARD:
216 /*
217 * This packet is just discarded.
218 */
219 ipsec6stat.out_polvio++;
220 ip6stat.ip6s_cantforward++;
221 key_freesp(sp);
222 if (mcopy) {
223 #if 0
224 /* XXX: what icmp ? */
225 #else
226 m_freem(mcopy);
227 #endif
228 }
229 m_freem(m);
230 return;
231
232 case IPSEC_POLICY_BYPASS:
233 case IPSEC_POLICY_NONE:
234 /* no need to do IPsec. */
235 key_freesp(sp);
236 goto skip_ipsec;
237
238 case IPSEC_POLICY_IPSEC:
239 if (sp->req == NULL) {
240 /* XXX should be panic ? */
241 printf("ip6_forward: No IPsec request specified.\n");
242 ip6stat.ip6s_cantforward++;
243 key_freesp(sp);
244 if (mcopy) {
245 #if 0
246 /* XXX: what icmp ? */
247 #else
248 m_freem(mcopy);
249 #endif
250 }
251 m_freem(m);
252 return;
253 }
254 /* do IPsec */
255 break;
256
257 case IPSEC_POLICY_ENTRUST:
258 default:
259 /* should be panic ?? */
260 printf("ip6_forward: Invalid policy found. %d\n", sp->policy);
261 key_freesp(sp);
262 goto skip_ipsec;
263 }
264
265 {
266 struct ipsecrequest *isr = NULL;
267 struct ipsec_output_state state;
268
269 /*
270 * when the kernel forwards a packet, it is not proper to apply
271 * IPsec transport mode to the packet is not proper. this check
272 * avoid from this.
273 * at present, if there is even a transport mode SA request in the
274 * security policy, the kernel does not apply IPsec to the packet.
275 * this check is not enough because the following case is valid.
276 * ipsec esp/tunnel/xxx-xxx/require esp/transport//require;
277 */
278 for (isr = sp->req; isr; isr = isr->next) {
279 if (isr->saidx.mode == IPSEC_MODE_ANY)
280 goto doipsectunnel;
281 if (isr->saidx.mode == IPSEC_MODE_TUNNEL)
282 goto doipsectunnel;
283 }
284
285 /*
286 * if there's no need for tunnel mode IPsec, skip.
287 */
288 if (!isr)
289 goto skip_ipsec;
290
291 doipsectunnel:
292 /*
293 * All the extension headers will become inaccessible
294 * (since they can be encrypted).
295 * Don't panic, we need no more updates to extension headers
296 * on inner IPv6 packet (since they are now encapsulated).
297 *
298 * IPv6 [ESP|AH] IPv6 [extension headers] payload
299 */
300 bzero(&state, sizeof(state));
301 state.m = m;
302 state.ro = NULL; /* update at ipsec6_output_tunnel() */
303 state.dst = NULL; /* update at ipsec6_output_tunnel() */
304
305 error = ipsec6_output_tunnel(&state, sp, 0);
306
307 m = state.m;
308 key_freesp(sp);
309
310 if (error) {
311 /* mbuf is already reclaimed in ipsec6_output_tunnel. */
312 switch (error) {
313 case EHOSTUNREACH:
314 case ENETUNREACH:
315 case EMSGSIZE:
316 case ENOBUFS:
317 case ENOMEM:
318 break;
319 default:
320 printf("ip6_output (ipsec): error code %d\n", error);
321 /* FALLTHROUGH */
322 case ENOENT:
323 /* don't show these error codes to the user */
324 break;
325 }
326 ip6stat.ip6s_cantforward++;
327 if (mcopy) {
328 #if 0
329 /* XXX: what icmp ? */
330 #else
331 m_freem(mcopy);
332 #endif
333 }
334 m_freem(m);
335 return;
336 }
337
338 if (ip6 != mtod(m, struct ip6_hdr *)) {
339 /*
340 * now tunnel mode headers are added. we are originating
341 * packet instead of forwarding the packet.
342 */
343 ip6_output(m, NULL, NULL, IPV6_FORWARDING/*XXX*/, NULL, NULL,
344 NULL);
345 goto freecopy;
346 }
347
348 /* adjust pointer */
349 dst = (struct sockaddr_in6 *)state.dst;
350 rt = state.ro ? state.ro->ro_rt : NULL;
351 if (dst != NULL && rt != NULL)
352 ipsecrt = 1;
353 }
354 skip_ipsec:
355 #endif /* IPSEC */
356
357 #ifdef IPSEC
358 if (ipsecrt)
359 goto skip_routing;
360 #endif
361
362 dst = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
363 if (!srcrt) {
364 /* ip6_forward_rt.ro_dst.sin6_addr is equal to ip6->ip6_dst */
365 if (ip6_forward_rt.ro_rt == 0 ||
366 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) == 0) {
367 if (ip6_forward_rt.ro_rt) {
368 RTFREE(ip6_forward_rt.ro_rt);
369 ip6_forward_rt.ro_rt = 0;
370 }
371
372 /* this probably fails but give it a try again */
373 rtalloc((struct route *)&ip6_forward_rt);
374 }
375
376 if (ip6_forward_rt.ro_rt == 0) {
377 ip6stat.ip6s_noroute++;
378 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
379 if (mcopy) {
380 icmp6_error(mcopy, ICMP6_DST_UNREACH,
381 ICMP6_DST_UNREACH_NOROUTE, 0);
382 }
383 m_freem(m);
384 return;
385 }
386 } else if ((rt = ip6_forward_rt.ro_rt) == 0 ||
387 !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &dst->sin6_addr)) {
388 if (ip6_forward_rt.ro_rt) {
389 RTFREE(ip6_forward_rt.ro_rt);
390 ip6_forward_rt.ro_rt = 0;
391 }
392 bzero(dst, sizeof(*dst));
393 dst->sin6_len = sizeof(struct sockaddr_in6);
394 dst->sin6_family = AF_INET6;
395 dst->sin6_addr = ip6->ip6_dst;
396
397 rtalloc((struct route *)&ip6_forward_rt);
398 if (ip6_forward_rt.ro_rt == 0) {
399 ip6stat.ip6s_noroute++;
400 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_noroute);
401 if (mcopy) {
402 icmp6_error(mcopy, ICMP6_DST_UNREACH,
403 ICMP6_DST_UNREACH_NOROUTE, 0);
404 }
405 m_freem(m);
406 return;
407 }
408 }
409 rt = ip6_forward_rt.ro_rt;
410 #ifdef IPSEC
411 skip_routing:;
412 #endif
413
414 /*
415 * Source scope check: if a packet can't be delivered to its
416 * destination for the reason that the destination is beyond the scope
417 * of the source address, discard the packet and return an icmp6
418 * destination unreachable error with Code 2 (beyond scope of source
419 * address). We use a local copy of ip6_src, since in6_setscope()
420 * will possibly modify its first argument.
421 * [draft-ietf-ipngwg-icmp-v3-04.txt, Section 3.1]
422 */
423 src_in6 = ip6->ip6_src;
424 if (in6_setscope(&src_in6, rt->rt_ifp, &outzone)) {
425 /* XXX: this should not happen */
426 ip6stat.ip6s_cantforward++;
427 ip6stat.ip6s_badscope++;
428 m_freem(m);
429 return;
430 }
431 if (in6_setscope(&src_in6, m->m_pkthdr.rcvif, &inzone)) {
432 ip6stat.ip6s_cantforward++;
433 ip6stat.ip6s_badscope++;
434 m_freem(m);
435 return;
436 }
437 if (inzone != outzone
438 #ifdef IPSEC
439 && !ipsecrt
440 #endif
441 ) {
442 ip6stat.ip6s_cantforward++;
443 ip6stat.ip6s_badscope++;
444 in6_ifstat_inc(rt->rt_ifp, ifs6_in_discard);
445
446 if (ip6_log_time + ip6_log_interval < time_second) {
447 ip6_log_time = time_second;
448 log(LOG_DEBUG,
449 "cannot forward "
450 "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
451 ip6_sprintf(&ip6->ip6_src),
452 ip6_sprintf(&ip6->ip6_dst),
453 ip6->ip6_nxt,
454 if_name(m->m_pkthdr.rcvif), if_name(rt->rt_ifp));
455 }
456 if (mcopy)
457 icmp6_error(mcopy, ICMP6_DST_UNREACH,
458 ICMP6_DST_UNREACH_BEYONDSCOPE, 0);
459 m_freem(m);
460 return;
461 }
462
463 /*
464 * Destination scope check: if a packet is going to break the scope
465 * zone of packet's destination address, discard it. This case should
466 * usually be prevented by appropriately-configured routing table, but
467 * we need an explicit check because we may mistakenly forward the
468 * packet to a different zone by (e.g.) a default route.
469 */
470 dst_in6 = ip6->ip6_dst;
471 if (in6_setscope(&dst_in6, m->m_pkthdr.rcvif, &inzone) != 0 ||
472 in6_setscope(&dst_in6, rt->rt_ifp, &outzone) != 0 ||
473 inzone != outzone) {
474 ip6stat.ip6s_cantforward++;
475 ip6stat.ip6s_badscope++;
476 m_freem(m);
477 return;
478 }
479
480 if (m->m_pkthdr.len > IN6_LINKMTU(rt->rt_ifp)) {
481 in6_ifstat_inc(rt->rt_ifp, ifs6_in_toobig);
482 if (mcopy) {
483 u_long mtu;
484 #ifdef IPSEC
485 struct secpolicy *sp;
486 int ipsecerror;
487 size_t ipsechdrsiz;
488 #endif
489
490 mtu = IN6_LINKMTU(rt->rt_ifp);
491 #ifdef IPSEC
492 /*
493 * When we do IPsec tunnel ingress, we need to play
494 * with the link value (decrement IPsec header size
495 * from mtu value). The code is much simpler than v4
496 * case, as we have the outgoing interface for
497 * encapsulated packet as "rt->rt_ifp".
498 */
499 sp = ipsec6_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND,
500 IP_FORWARDING, &ipsecerror);
501 if (sp) {
502 ipsechdrsiz = ipsec6_hdrsiz(mcopy,
503 IPSEC_DIR_OUTBOUND, NULL);
504 if (ipsechdrsiz < mtu)
505 mtu -= ipsechdrsiz;
506 }
507
508 /*
509 * if mtu becomes less than minimum MTU,
510 * tell minimum MTU (and I'll need to fragment it).
511 */
512 if (mtu < IPV6_MMTU)
513 mtu = IPV6_MMTU;
514 #endif
515 icmp6_error(mcopy, ICMP6_PACKET_TOO_BIG, 0, mtu);
516 }
517 m_freem(m);
518 return;
519 }
520
521 if (rt->rt_flags & RTF_GATEWAY)
522 dst = (struct sockaddr_in6 *)rt->rt_gateway;
523
524 /*
525 * If we are to forward the packet using the same interface
526 * as one we got the packet from, perhaps we should send a redirect
527 * to sender to shortcut a hop.
528 * Only send redirect if source is sending directly to us,
529 * and if packet was not source routed (or has any options).
530 * Also, don't send redirect if forwarding using a route
531 * modified by a redirect.
532 */
533 if (ip6_sendredirects && rt->rt_ifp == m->m_pkthdr.rcvif && !srcrt &&
534 #ifdef IPSEC
535 !ipsecrt &&
536 #endif
537 (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0) {
538 if ((rt->rt_ifp->if_flags & IFF_POINTOPOINT) != 0) {
539 /*
540 * If the incoming interface is equal to the outgoing
541 * one, and the link attached to the interface is
542 * point-to-point, then it will be highly probable
543 * that a routing loop occurs. Thus, we immediately
544 * drop the packet and send an ICMPv6 error message.
545 *
546 * type/code is based on suggestion by Rich Draves.
547 * not sure if it is the best pick.
548 */
549 icmp6_error(mcopy, ICMP6_DST_UNREACH,
550 ICMP6_DST_UNREACH_ADDR, 0);
551 m_freem(m);
552 return;
553 }
554 type = ND_REDIRECT;
555 }
556
557 /*
558 * Check with the firewall...
559 */
560 if (ip6_fw_enable && ip6_fw_chk_ptr) {
561 u_short port = 0;
562 /* If ipfw says divert, we have to just drop packet */
563 if ((*ip6_fw_chk_ptr)(&ip6, rt->rt_ifp, &port, &m)) {
564 m_freem(m);
565 goto freecopy;
566 }
567 if (!m)
568 goto freecopy;
569 }
570
571 /*
572 * Fake scoped addresses. Note that even link-local source or
573 * destinaion can appear, if the originating node just sends the
574 * packet to us (without address resolution for the destination).
575 * Since both icmp6_error and icmp6_redirect_output fill the embedded
576 * link identifiers, we can do this stuff after making a copy for
577 * returning an error.
578 */
579 if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) {
580 /*
581 * See corresponding comments in ip6_output.
582 * XXX: but is it possible that ip6_forward() sends a packet
583 * to a loopback interface? I don't think so, and thus
584 * I bark here. (jinmei@kame.net)
585 * XXX: it is common to route invalid packets to loopback.
586 * also, the codepath will be visited on use of ::1 in
587 * rthdr. (itojun)
588 */
589 #if 1
590 if (0)
591 #else
592 if ((rt->rt_flags & (RTF_BLACKHOLE|RTF_REJECT)) == 0)
593 #endif
594 {
595 printf("ip6_forward: outgoing interface is loopback. "
596 "src %s, dst %s, nxt %d, rcvif %s, outif %s\n",
597 ip6_sprintf(&ip6->ip6_src),
598 ip6_sprintf(&ip6->ip6_dst),
599 ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif),
600 if_name(rt->rt_ifp));
601 }
602
603 /* we can just use rcvif in forwarding. */
604 origifp = m->m_pkthdr.rcvif;
605 }
606 else
607 origifp = rt->rt_ifp;
608 /*
609 * clear embedded scope identifiers if necessary.
610 * in6_clearscope will touch the addresses only when necessary.
611 */
612 in6_clearscope(&ip6->ip6_src);
613 in6_clearscope(&ip6->ip6_dst);
614
615 /* Jump over all PFIL processing if hooks are not active. */
616 if (inet6_pfil_hook.ph_busy_count == -1)
617 goto pass;
618
619 /* Run through list of hooks for output packets. */
620 error = pfil_run_hooks(&inet6_pfil_hook, &m, rt->rt_ifp, PFIL_OUT, NULL);
621 if (error != 0)
622 goto senderr;
623 if (m == NULL)
624 goto freecopy;
625 ip6 = mtod(m, struct ip6_hdr *);
626
627 pass:
628 error = nd6_output(rt->rt_ifp, origifp, m, dst, rt);
629 if (error) {
630 in6_ifstat_inc(rt->rt_ifp, ifs6_out_discard);
631 ip6stat.ip6s_cantforward++;
632 } else {
633 ip6stat.ip6s_forward++;
634 in6_ifstat_inc(rt->rt_ifp, ifs6_out_forward);
635 if (type)
636 ip6stat.ip6s_redirectsent++;
637 else {
638 if (mcopy)
639 goto freecopy;
640 }
641 }
642
643 senderr:
644 if (mcopy == NULL)
645 return;
646 switch (error) {
647 case 0:
648 if (type == ND_REDIRECT) {
649 icmp6_redirect_output(mcopy, rt);
650 return;
651 }
652 goto freecopy;
653
654 case EMSGSIZE:
655 /* xxx MTU is constant in PPP? */
656 goto freecopy;
657
658 case ENOBUFS:
659 /* Tell source to slow down like source quench in IP? */
660 goto freecopy;
661
662 case ENETUNREACH: /* shouldn't happen, checked above */
663 case EHOSTUNREACH:
664 case ENETDOWN:
665 case EHOSTDOWN:
666 default:
667 type = ICMP6_DST_UNREACH;
668 code = ICMP6_DST_UNREACH_ADDR;
669 break;
670 }
671 icmp6_error(mcopy, type, code, 0);
672 return;
673
674 freecopy:
675 m_freem(mcopy);
676 return;
677 }
Cache object: 2de0ac8a406c67c7a3d5acfa41ad3f51
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