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_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $
30 */
31
32 /*-
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
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
58 * SUCH DAMAGE.
59 *
60 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
61 */
62
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD: releng/9.2/sys/netinet6/ip6_input.c 253239 2013-07-12 01:52:31Z hrs $");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipfw.h"
69 #include "opt_ipsec.h"
70 #include "opt_route.h"
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/malloc.h>
75 #include <sys/mbuf.h>
76 #include <sys/proc.h>
77 #include <sys/domain.h>
78 #include <sys/protosw.h>
79 #include <sys/socket.h>
80 #include <sys/socketvar.h>
81 #include <sys/errno.h>
82 #include <sys/time.h>
83 #include <sys/kernel.h>
84 #include <sys/syslog.h>
85
86 #include <net/if.h>
87 #include <net/if_types.h>
88 #include <net/if_dl.h>
89 #include <net/route.h>
90 #include <net/netisr.h>
91 #include <net/pfil.h>
92 #include <net/vnet.h>
93
94 #include <netinet/in.h>
95 #include <netinet/ip_var.h>
96 #include <netinet/in_systm.h>
97 #include <net/if_llatbl.h>
98 #ifdef INET
99 #include <netinet/ip.h>
100 #include <netinet/ip_icmp.h>
101 #endif /* INET */
102 #include <netinet/ip6.h>
103 #include <netinet6/in6_var.h>
104 #include <netinet6/ip6_var.h>
105 #include <netinet/in_pcb.h>
106 #include <netinet/icmp6.h>
107 #include <netinet6/scope6_var.h>
108 #include <netinet6/in6_ifattach.h>
109 #include <netinet6/nd6.h>
110
111 #ifdef IPSEC
112 #include <netipsec/ipsec.h>
113 #include <netinet6/ip6_ipsec.h>
114 #include <netipsec/ipsec6.h>
115 #endif /* IPSEC */
116
117 #include <netinet6/ip6protosw.h>
118
119 #ifdef FLOWTABLE
120 #include <net/flowtable.h>
121 VNET_DECLARE(int, ip6_output_flowtable_size);
122 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size)
123 #endif
124
125 extern struct domain inet6domain;
126
127 u_char ip6_protox[IPPROTO_MAX];
128 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
129
130 static struct netisr_handler ip6_nh = {
131 .nh_name = "ip6",
132 .nh_handler = ip6_input,
133 .nh_proto = NETISR_IPV6,
134 .nh_policy = NETISR_POLICY_FLOW,
135 };
136
137 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch);
138 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
139
140 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
141
142 VNET_DEFINE(struct ip6stat, ip6stat);
143
144 struct rwlock in6_ifaddr_lock;
145 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
146
147 static void ip6_init2(void *);
148 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
149 static struct ip6aux *ip6_addaux(struct mbuf *);
150 static struct ip6aux *ip6_findaux(struct mbuf *m);
151 static void ip6_delaux (struct mbuf *);
152 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
153 #ifdef PULLDOWN_TEST
154 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
155 #endif
156
157 /*
158 * IP6 initialization: fill in IP6 protocol switch table.
159 * All protocols not implemented in kernel go to raw IP6 protocol handler.
160 */
161 void
162 ip6_init(void)
163 {
164 struct ip6protosw *pr;
165 int i;
166
167 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
168 &V_ip6_auto_linklocal);
169 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
170 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
171
172 TAILQ_INIT(&V_in6_ifaddrhead);
173
174 /* Initialize packet filter hooks. */
175 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
176 V_inet6_pfil_hook.ph_af = AF_INET6;
177 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
178 printf("%s: WARNING: unable to register pfil hook, "
179 "error %d\n", __func__, i);
180
181 scope6_init();
182 addrsel_policy_init();
183 nd6_init();
184 frag6_init();
185
186 #ifdef FLOWTABLE
187 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size",
188 &V_ip6_output_flowtable_size)) {
189 if (V_ip6_output_flowtable_size < 256)
190 V_ip6_output_flowtable_size = 256;
191 if (!powerof2(V_ip6_output_flowtable_size)) {
192 printf("flowtable must be power of 2 size\n");
193 V_ip6_output_flowtable_size = 2048;
194 }
195 } else {
196 /*
197 * round up to the next power of 2
198 */
199 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1);
200 }
201 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU);
202 #endif
203
204 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
205
206 /* Skip global initialization stuff for non-default instances. */
207 if (!IS_DEFAULT_VNET(curvnet))
208 return;
209
210 #ifdef DIAGNOSTIC
211 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
212 panic("sizeof(protosw) != sizeof(ip6protosw)");
213 #endif
214 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
215 if (pr == NULL)
216 panic("ip6_init");
217
218 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
219 for (i = 0; i < IPPROTO_MAX; i++)
220 ip6_protox[i] = pr - inet6sw;
221 /*
222 * Cycle through IP protocols and put them into the appropriate place
223 * in ip6_protox[].
224 */
225 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
226 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
227 if (pr->pr_domain->dom_family == PF_INET6 &&
228 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
229 /* Be careful to only index valid IP protocols. */
230 if (pr->pr_protocol < IPPROTO_MAX)
231 ip6_protox[pr->pr_protocol] = pr - inet6sw;
232 }
233
234 netisr_register(&ip6_nh);
235 }
236
237 /*
238 * The protocol to be inserted into ip6_protox[] must be already registered
239 * in inet6sw[], either statically or through pf_proto_register().
240 */
241 int
242 ip6proto_register(short ip6proto)
243 {
244 struct ip6protosw *pr;
245
246 /* Sanity checks. */
247 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
248 return (EPROTONOSUPPORT);
249
250 /*
251 * The protocol slot must not be occupied by another protocol
252 * already. An index pointing to IPPROTO_RAW is unused.
253 */
254 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
255 if (pr == NULL)
256 return (EPFNOSUPPORT);
257 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
258 return (EEXIST);
259
260 /*
261 * Find the protocol position in inet6sw[] and set the index.
262 */
263 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
264 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) {
265 if (pr->pr_domain->dom_family == PF_INET6 &&
266 pr->pr_protocol && pr->pr_protocol == ip6proto) {
267 ip6_protox[pr->pr_protocol] = pr - inet6sw;
268 return (0);
269 }
270 }
271 return (EPROTONOSUPPORT);
272 }
273
274 int
275 ip6proto_unregister(short ip6proto)
276 {
277 struct ip6protosw *pr;
278
279 /* Sanity checks. */
280 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
281 return (EPROTONOSUPPORT);
282
283 /* Check if the protocol was indeed registered. */
284 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
285 if (pr == NULL)
286 return (EPFNOSUPPORT);
287 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
288 return (ENOENT);
289
290 /* Reset the protocol slot to IPPROTO_RAW. */
291 ip6_protox[ip6proto] = pr - inet6sw;
292 return (0);
293 }
294
295 #ifdef VIMAGE
296 void
297 ip6_destroy()
298 {
299
300 nd6_destroy();
301 callout_drain(&V_in6_tmpaddrtimer_ch);
302 }
303 #endif
304
305 static int
306 ip6_init2_vnet(const void *unused __unused)
307 {
308
309 /* nd6_timer_init */
310 callout_init(&V_nd6_timer_ch, 0);
311 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
312
313 /* timer for regeneranation of temporary addresses randomize ID */
314 callout_init(&V_in6_tmpaddrtimer_ch, 0);
315 callout_reset(&V_in6_tmpaddrtimer_ch,
316 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
317 V_ip6_temp_regen_advance) * hz,
318 in6_tmpaddrtimer, curvnet);
319
320 return (0);
321 }
322
323 static void
324 ip6_init2(void *dummy)
325 {
326
327 ip6_init2_vnet(NULL);
328 }
329
330 /* cheat */
331 /* This must be after route_init(), which is now SI_ORDER_THIRD */
332 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
333
334 static int
335 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
336 int *nxt, int *ours)
337 {
338 struct ip6_hdr *ip6;
339 struct ip6_hbh *hbh;
340
341 if (ip6_hopopts_input(plen, rtalert, &m, off)) {
342 #if 0 /*touches NULL pointer*/
343 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
344 #endif
345 goto out; /* m have already been freed */
346 }
347
348 /* adjust pointer */
349 ip6 = mtod(m, struct ip6_hdr *);
350
351 /*
352 * if the payload length field is 0 and the next header field
353 * indicates Hop-by-Hop Options header, then a Jumbo Payload
354 * option MUST be included.
355 */
356 if (ip6->ip6_plen == 0 && *plen == 0) {
357 /*
358 * Note that if a valid jumbo payload option is
359 * contained, ip6_hopopts_input() must set a valid
360 * (non-zero) payload length to the variable plen.
361 */
362 IP6STAT_INC(ip6s_badoptions);
363 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
364 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
365 icmp6_error(m, ICMP6_PARAM_PROB,
366 ICMP6_PARAMPROB_HEADER,
367 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
368 goto out;
369 }
370 #ifndef PULLDOWN_TEST
371 /* ip6_hopopts_input() ensures that mbuf is contiguous */
372 hbh = (struct ip6_hbh *)(ip6 + 1);
373 #else
374 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
375 sizeof(struct ip6_hbh));
376 if (hbh == NULL) {
377 IP6STAT_INC(ip6s_tooshort);
378 goto out;
379 }
380 #endif
381 *nxt = hbh->ip6h_nxt;
382
383 /*
384 * If we are acting as a router and the packet contains a
385 * router alert option, see if we know the option value.
386 * Currently, we only support the option value for MLD, in which
387 * case we should pass the packet to the multicast routing
388 * daemon.
389 */
390 if (*rtalert != ~0) {
391 switch (*rtalert) {
392 case IP6OPT_RTALERT_MLD:
393 if (V_ip6_forwarding)
394 *ours = 1;
395 break;
396 default:
397 /*
398 * RFC2711 requires unrecognized values must be
399 * silently ignored.
400 */
401 break;
402 }
403 }
404
405 return (0);
406
407 out:
408 return (1);
409 }
410
411 void
412 ip6_input(struct mbuf *m)
413 {
414 struct ip6_hdr *ip6;
415 int off = sizeof(struct ip6_hdr), nest;
416 u_int32_t plen;
417 u_int32_t rtalert = ~0;
418 int nxt, ours = 0;
419 struct ifnet *deliverifp = NULL, *ifp = NULL;
420 struct in6_addr odst;
421 struct route_in6 rin6;
422 int srcrt = 0;
423 struct llentry *lle = NULL;
424 struct sockaddr_in6 dst6, *dst;
425
426 bzero(&rin6, sizeof(struct route_in6));
427 #ifdef IPSEC
428 /*
429 * should the inner packet be considered authentic?
430 * see comment in ah4_input().
431 * NB: m cannot be NULL when passed to the input routine
432 */
433
434 m->m_flags &= ~M_AUTHIPHDR;
435 m->m_flags &= ~M_AUTHIPDGM;
436
437 #endif /* IPSEC */
438
439 /*
440 * make sure we don't have onion peering information into m_tag.
441 */
442 ip6_delaux(m);
443
444 if (m->m_flags & M_FASTFWD_OURS) {
445 /*
446 * Firewall changed destination to local.
447 */
448 m->m_flags &= ~M_FASTFWD_OURS;
449 ours = 1;
450 deliverifp = m->m_pkthdr.rcvif;
451 ip6 = mtod(m, struct ip6_hdr *);
452 goto hbhcheck;
453 }
454
455 /*
456 * mbuf statistics
457 */
458 if (m->m_flags & M_EXT) {
459 if (m->m_next)
460 IP6STAT_INC(ip6s_mext2m);
461 else
462 IP6STAT_INC(ip6s_mext1);
463 } else {
464 if (m->m_next) {
465 if (m->m_flags & M_LOOP) {
466 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
467 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX)
468 IP6STAT_INC(
469 ip6s_m2m[m->m_pkthdr.rcvif->if_index]);
470 else
471 IP6STAT_INC(ip6s_m2m[0]);
472 } else
473 IP6STAT_INC(ip6s_m1);
474 }
475
476 /* drop the packet if IPv6 operation is disabled on the IF */
477 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
478 m_freem(m);
479 return;
480 }
481
482 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
483 IP6STAT_INC(ip6s_total);
484
485 #ifndef PULLDOWN_TEST
486 /*
487 * L2 bridge code and some other code can return mbuf chain
488 * that does not conform to KAME requirement. too bad.
489 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
490 */
491 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
492 struct mbuf *n;
493
494 MGETHDR(n, M_DONTWAIT, MT_HEADER);
495 if (n)
496 M_MOVE_PKTHDR(n, m);
497 if (n && n->m_pkthdr.len > MHLEN) {
498 MCLGET(n, M_DONTWAIT);
499 if ((n->m_flags & M_EXT) == 0) {
500 m_freem(n);
501 n = NULL;
502 }
503 }
504 if (n == NULL) {
505 m_freem(m);
506 return; /* ENOBUFS */
507 }
508
509 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
510 n->m_len = n->m_pkthdr.len;
511 m_freem(m);
512 m = n;
513 }
514 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
515 #endif
516
517 if (m->m_len < sizeof(struct ip6_hdr)) {
518 struct ifnet *inifp;
519 inifp = m->m_pkthdr.rcvif;
520 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
521 IP6STAT_INC(ip6s_toosmall);
522 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
523 return;
524 }
525 }
526
527 ip6 = mtod(m, struct ip6_hdr *);
528
529 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
530 IP6STAT_INC(ip6s_badvers);
531 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
532 goto bad;
533 }
534
535 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
536
537 /*
538 * Check against address spoofing/corruption.
539 */
540 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
541 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
542 /*
543 * XXX: "badscope" is not very suitable for a multicast source.
544 */
545 IP6STAT_INC(ip6s_badscope);
546 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
547 goto bad;
548 }
549 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
550 !(m->m_flags & M_LOOP)) {
551 /*
552 * In this case, the packet should come from the loopback
553 * interface. However, we cannot just check the if_flags,
554 * because ip6_mloopback() passes the "actual" interface
555 * as the outgoing/incoming interface.
556 */
557 IP6STAT_INC(ip6s_badscope);
558 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
559 goto bad;
560 }
561
562 #ifdef ALTQ
563 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
564 /* packet is dropped by traffic conditioner */
565 return;
566 }
567 #endif
568 /*
569 * The following check is not documented in specs. A malicious
570 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
571 * and bypass security checks (act as if it was from 127.0.0.1 by using
572 * IPv6 src ::ffff:127.0.0.1). Be cautious.
573 *
574 * This check chokes if we are in an SIIT cloud. As none of BSDs
575 * support IPv4-less kernel compilation, we cannot support SIIT
576 * environment at all. So, it makes more sense for us to reject any
577 * malicious packets for non-SIIT environment, than try to do a
578 * partial support for SIIT environment.
579 */
580 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
581 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
582 IP6STAT_INC(ip6s_badscope);
583 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
584 goto bad;
585 }
586 #if 0
587 /*
588 * Reject packets with IPv4 compatible addresses (auto tunnel).
589 *
590 * The code forbids auto tunnel relay case in RFC1933 (the check is
591 * stronger than RFC1933). We may want to re-enable it if mech-xx
592 * is revised to forbid relaying case.
593 */
594 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
595 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
596 IP6STAT_INC(ip6s_badscope);
597 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
598 goto bad;
599 }
600 #endif
601 #ifdef IPSEC
602 /*
603 * Bypass packet filtering for packets previously handled by IPsec.
604 */
605 if (ip6_ipsec_filtertunnel(m))
606 goto passin;
607 #endif /* IPSEC */
608
609 /*
610 * Run through list of hooks for input packets.
611 *
612 * NB: Beware of the destination address changing
613 * (e.g. by NAT rewriting). When this happens,
614 * tell ip6_forward to do the right thing.
615 */
616 odst = ip6->ip6_dst;
617
618 /* Jump over all PFIL processing if hooks are not active. */
619 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
620 goto passin;
621
622 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
623 m->m_pkthdr.rcvif, PFIL_IN, NULL))
624 return;
625 if (m == NULL) /* consumed by filter */
626 return;
627 ip6 = mtod(m, struct ip6_hdr *);
628 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
629
630 if (m->m_flags & M_FASTFWD_OURS) {
631 m->m_flags &= ~M_FASTFWD_OURS;
632 ours = 1;
633 deliverifp = m->m_pkthdr.rcvif;
634 goto hbhcheck;
635 }
636 if ((m->m_flags & M_IP6_NEXTHOP) &&
637 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
638 /*
639 * Directly ship the packet on. This allows forwarding
640 * packets originally destined to us to some other directly
641 * connected host.
642 */
643 ip6_forward(m, 1);
644 goto out;
645 }
646
647 passin:
648 /*
649 * Disambiguate address scope zones (if there is ambiguity).
650 * We first make sure that the original source or destination address
651 * is not in our internal form for scoped addresses. Such addresses
652 * are not necessarily invalid spec-wise, but we cannot accept them due
653 * to the usage conflict.
654 * in6_setscope() then also checks and rejects the cases where src or
655 * dst are the loopback address and the receiving interface
656 * is not loopback.
657 */
658 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
659 IP6STAT_INC(ip6s_badscope); /* XXX */
660 goto bad;
661 }
662 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
663 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
664 IP6STAT_INC(ip6s_badscope);
665 goto bad;
666 }
667
668 /*
669 * Multicast check. Assume packet is for us to avoid
670 * prematurely taking locks.
671 */
672 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
673 ours = 1;
674 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
675 deliverifp = m->m_pkthdr.rcvif;
676 goto hbhcheck;
677 }
678
679 /*
680 * Unicast check
681 */
682
683 bzero(&dst6, sizeof(dst6));
684 dst6.sin6_family = AF_INET6;
685 dst6.sin6_len = sizeof(struct sockaddr_in6);
686 dst6.sin6_addr = ip6->ip6_dst;
687 ifp = m->m_pkthdr.rcvif;
688 IF_AFDATA_RLOCK(ifp);
689 lle = lla_lookup(LLTABLE6(ifp), 0,
690 (struct sockaddr *)&dst6);
691 IF_AFDATA_RUNLOCK(ifp);
692 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) {
693 struct ifaddr *ifa;
694 struct in6_ifaddr *ia6;
695 int bad;
696
697 bad = 1;
698 #define sa_equal(a1, a2) \
699 (bcmp((a1), (a2), ((a1))->sin6_len) == 0)
700 IF_ADDR_RLOCK(ifp);
701 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
702 if (ifa->ifa_addr->sa_family != dst6.sin6_family)
703 continue;
704 if (sa_equal(&dst6, ifa->ifa_addr))
705 break;
706 }
707 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p",
708 __func__, lle));
709 #undef sa_equal
710
711 ia6 = (struct in6_ifaddr *)ifa;
712 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
713 /* Count the packet in the ip address stats */
714 ia6->ia_ifa.if_ipackets++;
715 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
716
717 /*
718 * record address information into m_tag.
719 */
720 (void)ip6_setdstifaddr(m, ia6);
721
722 bad = 0;
723 } else {
724 char ip6bufs[INET6_ADDRSTRLEN];
725 char ip6bufd[INET6_ADDRSTRLEN];
726 /* address is not ready, so discard the packet. */
727 nd6log((LOG_INFO,
728 "ip6_input: packet to an unready address %s->%s\n",
729 ip6_sprintf(ip6bufs, &ip6->ip6_src),
730 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
731 }
732 IF_ADDR_RUNLOCK(ifp);
733 LLE_RUNLOCK(lle);
734 if (bad)
735 goto bad;
736 else {
737 ours = 1;
738 deliverifp = ifp;
739 goto hbhcheck;
740 }
741 }
742 if (lle != NULL)
743 LLE_RUNLOCK(lle);
744
745 dst = &rin6.ro_dst;
746 dst->sin6_len = sizeof(struct sockaddr_in6);
747 dst->sin6_family = AF_INET6;
748 dst->sin6_addr = ip6->ip6_dst;
749 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m));
750 if (rin6.ro_rt)
751 RT_UNLOCK(rin6.ro_rt);
752
753 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
754
755 /*
756 * Accept the packet if the forwarding interface to the destination
757 * according to the routing table is the loopback interface,
758 * unless the associated route has a gateway.
759 * Note that this approach causes to accept a packet if there is a
760 * route to the loopback interface for the destination of the packet.
761 * But we think it's even useful in some situations, e.g. when using
762 * a special daemon which wants to intercept the packet.
763 *
764 * XXX: some OSes automatically make a cloned route for the destination
765 * of an outgoing packet. If the outgoing interface of the packet
766 * is a loopback one, the kernel would consider the packet to be
767 * accepted, even if we have no such address assinged on the interface.
768 * We check the cloned flag of the route entry to reject such cases,
769 * assuming that route entries for our own addresses are not made by
770 * cloning (it should be true because in6_addloop explicitly installs
771 * the host route). However, we might have to do an explicit check
772 * while it would be less efficient. Or, should we rather install a
773 * reject route for such a case?
774 */
775 if (rin6.ro_rt &&
776 (rin6.ro_rt->rt_flags &
777 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
778 #ifdef RTF_WASCLONED
779 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) &&
780 #endif
781 #ifdef RTF_CLONED
782 !(rin6.ro_rt->rt_flags & RTF_CLONED) &&
783 #endif
784 #if 0
785 /*
786 * The check below is redundant since the comparison of
787 * the destination and the key of the rtentry has
788 * already done through looking up the routing table.
789 */
790 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
791 &rt6_key(rin6.ro_rt)->sin6_addr)
792 #endif
793 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
794 int free_ia6 = 0;
795 struct in6_ifaddr *ia6;
796
797 /*
798 * found the loopback route to the interface address
799 */
800 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
801 struct sockaddr_in6 dest6;
802
803 bzero(&dest6, sizeof(dest6));
804 dest6.sin6_family = AF_INET6;
805 dest6.sin6_len = sizeof(dest6);
806 dest6.sin6_addr = ip6->ip6_dst;
807 ia6 = (struct in6_ifaddr *)
808 ifa_ifwithaddr((struct sockaddr *)&dest6);
809 if (ia6 == NULL)
810 goto bad;
811 free_ia6 = 1;
812 }
813 else
814 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
815
816 /*
817 * record address information into m_tag.
818 */
819 (void)ip6_setdstifaddr(m, ia6);
820
821 /*
822 * packets to a tentative, duplicated, or somehow invalid
823 * address must not be accepted.
824 */
825 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
826 /* this address is ready */
827 ours = 1;
828 deliverifp = ia6->ia_ifp; /* correct? */
829 /* Count the packet in the ip address stats */
830 ia6->ia_ifa.if_ipackets++;
831 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
832 if (ia6 != NULL && free_ia6 != 0)
833 ifa_free(&ia6->ia_ifa);
834 goto hbhcheck;
835 } else {
836 char ip6bufs[INET6_ADDRSTRLEN];
837 char ip6bufd[INET6_ADDRSTRLEN];
838 /* address is not ready, so discard the packet. */
839 nd6log((LOG_INFO,
840 "ip6_input: packet to an unready address %s->%s\n",
841 ip6_sprintf(ip6bufs, &ip6->ip6_src),
842 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
843
844 if (ia6 != NULL && free_ia6 != 0)
845 ifa_free(&ia6->ia_ifa);
846 goto bad;
847 }
848 }
849
850 /*
851 * FAITH (Firewall Aided Internet Translator)
852 */
853 if (V_ip6_keepfaith) {
854 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
855 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
856 /* XXX do we need more sanity checks? */
857 ours = 1;
858 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
859 goto hbhcheck;
860 }
861 }
862
863 /*
864 * Now there is no reason to process the packet if it's not our own
865 * and we're not a router.
866 */
867 if (!V_ip6_forwarding) {
868 IP6STAT_INC(ip6s_cantforward);
869 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
870 goto bad;
871 }
872
873 hbhcheck:
874 /*
875 * record address information into m_tag, if we don't have one yet.
876 * note that we are unable to record it, if the address is not listed
877 * as our interface address (e.g. multicast addresses, addresses
878 * within FAITH prefixes and such).
879 */
880 if (deliverifp) {
881 struct in6_ifaddr *ia6;
882
883 if ((ia6 = ip6_getdstifaddr(m)) != NULL) {
884 ifa_free(&ia6->ia_ifa);
885 } else {
886 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
887 if (ia6) {
888 if (!ip6_setdstifaddr(m, ia6)) {
889 /*
890 * XXX maybe we should drop the packet here,
891 * as we could not provide enough information
892 * to the upper layers.
893 */
894 }
895 ifa_free(&ia6->ia_ifa);
896 }
897 }
898 }
899
900 /*
901 * Process Hop-by-Hop options header if it's contained.
902 * m may be modified in ip6_hopopts_input().
903 * If a JumboPayload option is included, plen will also be modified.
904 */
905 plen = (u_int32_t)ntohs(ip6->ip6_plen);
906 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
907 int error;
908
909 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours);
910 if (error != 0)
911 goto out;
912 } else
913 nxt = ip6->ip6_nxt;
914
915 /*
916 * Check that the amount of data in the buffers
917 * is as at least much as the IPv6 header would have us expect.
918 * Trim mbufs if longer than we expect.
919 * Drop packet if shorter than we expect.
920 */
921 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
922 IP6STAT_INC(ip6s_tooshort);
923 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
924 goto bad;
925 }
926 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
927 if (m->m_len == m->m_pkthdr.len) {
928 m->m_len = sizeof(struct ip6_hdr) + plen;
929 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
930 } else
931 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
932 }
933
934 /*
935 * Forward if desirable.
936 */
937 if (V_ip6_mrouter &&
938 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
939 /*
940 * If we are acting as a multicast router, all
941 * incoming multicast packets are passed to the
942 * kernel-level multicast forwarding function.
943 * The packet is returned (relatively) intact; if
944 * ip6_mforward() returns a non-zero value, the packet
945 * must be discarded, else it may be accepted below.
946 *
947 * XXX TODO: Check hlim and multicast scope here to avoid
948 * unnecessarily calling into ip6_mforward().
949 */
950 if (ip6_mforward &&
951 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
952 IP6STAT_INC(ip6s_cantforward);
953 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
954 goto bad;
955 }
956 } else if (!ours) {
957 ip6_forward(m, srcrt);
958 goto out;
959 }
960
961 ip6 = mtod(m, struct ip6_hdr *);
962
963 /*
964 * Malicious party may be able to use IPv4 mapped addr to confuse
965 * tcp/udp stack and bypass security checks (act as if it was from
966 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
967 *
968 * For SIIT end node behavior, you may want to disable the check.
969 * However, you will become vulnerable to attacks using IPv4 mapped
970 * source.
971 */
972 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
973 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
974 IP6STAT_INC(ip6s_badscope);
975 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
976 goto bad;
977 }
978
979 /*
980 * Tell launch routine the next header
981 */
982 IP6STAT_INC(ip6s_delivered);
983 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
984 nest = 0;
985
986 while (nxt != IPPROTO_DONE) {
987 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
988 IP6STAT_INC(ip6s_toomanyhdr);
989 goto bad;
990 }
991
992 /*
993 * protection against faulty packet - there should be
994 * more sanity checks in header chain processing.
995 */
996 if (m->m_pkthdr.len < off) {
997 IP6STAT_INC(ip6s_tooshort);
998 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
999 goto bad;
1000 }
1001
1002 #ifdef IPSEC
1003 /*
1004 * enforce IPsec policy checking if we are seeing last header.
1005 * note that we do not visit this with protocols with pcb layer
1006 * code - like udp/tcp/raw ip.
1007 */
1008 if (ip6_ipsec_input(m, nxt))
1009 goto bad;
1010 #endif /* IPSEC */
1011
1012 /*
1013 * Use mbuf flags to propagate Router Alert option to
1014 * ICMPv6 layer, as hop-by-hop options have been stripped.
1015 */
1016 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
1017 m->m_flags |= M_RTALERT_MLD;
1018
1019 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
1020 }
1021 goto out;
1022 bad:
1023 m_freem(m);
1024 out:
1025 if (rin6.ro_rt)
1026 RTFREE(rin6.ro_rt);
1027 }
1028
1029 /*
1030 * set/grab in6_ifaddr correspond to IPv6 destination address.
1031 * XXX backward compatibility wrapper
1032 *
1033 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
1034 * and then bump it when the tag is copied, and release it when the tag is
1035 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
1036 * we just bump the ia refcount when we receive it. This should be fixed.
1037 */
1038 static struct ip6aux *
1039 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
1040 {
1041 struct ip6aux *ip6a;
1042
1043 ip6a = ip6_addaux(m);
1044 if (ip6a)
1045 ip6a->ip6a_dstia6 = ia6;
1046 return ip6a; /* NULL if failed to set */
1047 }
1048
1049 struct in6_ifaddr *
1050 ip6_getdstifaddr(struct mbuf *m)
1051 {
1052 struct ip6aux *ip6a;
1053 struct in6_ifaddr *ia;
1054
1055 ip6a = ip6_findaux(m);
1056 if (ip6a) {
1057 ia = ip6a->ip6a_dstia6;
1058 ifa_ref(&ia->ia_ifa);
1059 return ia;
1060 } else
1061 return NULL;
1062 }
1063
1064 /*
1065 * Hop-by-Hop options header processing. If a valid jumbo payload option is
1066 * included, the real payload length will be stored in plenp.
1067 *
1068 * rtalertp - XXX: should be stored more smart way
1069 */
1070 static int
1071 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
1072 struct mbuf **mp, int *offp)
1073 {
1074 struct mbuf *m = *mp;
1075 int off = *offp, hbhlen;
1076 struct ip6_hbh *hbh;
1077 u_int8_t *opt;
1078
1079 /* validation of the length of the header */
1080 #ifndef PULLDOWN_TEST
1081 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
1082 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1083 hbhlen = (hbh->ip6h_len + 1) << 3;
1084
1085 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
1086 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1087 #else
1088 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1089 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1090 if (hbh == NULL) {
1091 IP6STAT_INC(ip6s_tooshort);
1092 return -1;
1093 }
1094 hbhlen = (hbh->ip6h_len + 1) << 3;
1095 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
1096 hbhlen);
1097 if (hbh == NULL) {
1098 IP6STAT_INC(ip6s_tooshort);
1099 return -1;
1100 }
1101 #endif
1102 off += hbhlen;
1103 hbhlen -= sizeof(struct ip6_hbh);
1104 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
1105
1106 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1107 hbhlen, rtalertp, plenp) < 0)
1108 return (-1);
1109
1110 *offp = off;
1111 *mp = m;
1112 return (0);
1113 }
1114
1115 /*
1116 * Search header for all Hop-by-hop options and process each option.
1117 * This function is separate from ip6_hopopts_input() in order to
1118 * handle a case where the sending node itself process its hop-by-hop
1119 * options header. In such a case, the function is called from ip6_output().
1120 *
1121 * The function assumes that hbh header is located right after the IPv6 header
1122 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1123 * opthead + hbhlen is located in contiguous memory region.
1124 */
1125 int
1126 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1127 u_int32_t *rtalertp, u_int32_t *plenp)
1128 {
1129 struct ip6_hdr *ip6;
1130 int optlen = 0;
1131 u_int8_t *opt = opthead;
1132 u_int16_t rtalert_val;
1133 u_int32_t jumboplen;
1134 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1135
1136 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1137 switch (*opt) {
1138 case IP6OPT_PAD1:
1139 optlen = 1;
1140 break;
1141 case IP6OPT_PADN:
1142 if (hbhlen < IP6OPT_MINLEN) {
1143 IP6STAT_INC(ip6s_toosmall);
1144 goto bad;
1145 }
1146 optlen = *(opt + 1) + 2;
1147 break;
1148 case IP6OPT_ROUTER_ALERT:
1149 /* XXX may need check for alignment */
1150 if (hbhlen < IP6OPT_RTALERT_LEN) {
1151 IP6STAT_INC(ip6s_toosmall);
1152 goto bad;
1153 }
1154 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1155 /* XXX stat */
1156 icmp6_error(m, ICMP6_PARAM_PROB,
1157 ICMP6_PARAMPROB_HEADER,
1158 erroff + opt + 1 - opthead);
1159 return (-1);
1160 }
1161 optlen = IP6OPT_RTALERT_LEN;
1162 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1163 *rtalertp = ntohs(rtalert_val);
1164 break;
1165 case IP6OPT_JUMBO:
1166 /* XXX may need check for alignment */
1167 if (hbhlen < IP6OPT_JUMBO_LEN) {
1168 IP6STAT_INC(ip6s_toosmall);
1169 goto bad;
1170 }
1171 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1172 /* XXX stat */
1173 icmp6_error(m, ICMP6_PARAM_PROB,
1174 ICMP6_PARAMPROB_HEADER,
1175 erroff + opt + 1 - opthead);
1176 return (-1);
1177 }
1178 optlen = IP6OPT_JUMBO_LEN;
1179
1180 /*
1181 * IPv6 packets that have non 0 payload length
1182 * must not contain a jumbo payload option.
1183 */
1184 ip6 = mtod(m, struct ip6_hdr *);
1185 if (ip6->ip6_plen) {
1186 IP6STAT_INC(ip6s_badoptions);
1187 icmp6_error(m, ICMP6_PARAM_PROB,
1188 ICMP6_PARAMPROB_HEADER,
1189 erroff + opt - opthead);
1190 return (-1);
1191 }
1192
1193 /*
1194 * We may see jumbolen in unaligned location, so
1195 * we'd need to perform bcopy().
1196 */
1197 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1198 jumboplen = (u_int32_t)htonl(jumboplen);
1199
1200 #if 1
1201 /*
1202 * if there are multiple jumbo payload options,
1203 * *plenp will be non-zero and the packet will be
1204 * rejected.
1205 * the behavior may need some debate in ipngwg -
1206 * multiple options does not make sense, however,
1207 * there's no explicit mention in specification.
1208 */
1209 if (*plenp != 0) {
1210 IP6STAT_INC(ip6s_badoptions);
1211 icmp6_error(m, ICMP6_PARAM_PROB,
1212 ICMP6_PARAMPROB_HEADER,
1213 erroff + opt + 2 - opthead);
1214 return (-1);
1215 }
1216 #endif
1217
1218 /*
1219 * jumbo payload length must be larger than 65535.
1220 */
1221 if (jumboplen <= IPV6_MAXPACKET) {
1222 IP6STAT_INC(ip6s_badoptions);
1223 icmp6_error(m, ICMP6_PARAM_PROB,
1224 ICMP6_PARAMPROB_HEADER,
1225 erroff + opt + 2 - opthead);
1226 return (-1);
1227 }
1228 *plenp = jumboplen;
1229
1230 break;
1231 default: /* unknown option */
1232 if (hbhlen < IP6OPT_MINLEN) {
1233 IP6STAT_INC(ip6s_toosmall);
1234 goto bad;
1235 }
1236 optlen = ip6_unknown_opt(opt, m,
1237 erroff + opt - opthead);
1238 if (optlen == -1)
1239 return (-1);
1240 optlen += 2;
1241 break;
1242 }
1243 }
1244
1245 return (0);
1246
1247 bad:
1248 m_freem(m);
1249 return (-1);
1250 }
1251
1252 /*
1253 * Unknown option processing.
1254 * The third argument `off' is the offset from the IPv6 header to the option,
1255 * which is necessary if the IPv6 header the and option header and IPv6 header
1256 * is not contiguous in order to return an ICMPv6 error.
1257 */
1258 int
1259 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1260 {
1261 struct ip6_hdr *ip6;
1262
1263 switch (IP6OPT_TYPE(*optp)) {
1264 case IP6OPT_TYPE_SKIP: /* ignore the option */
1265 return ((int)*(optp + 1));
1266 case IP6OPT_TYPE_DISCARD: /* silently discard */
1267 m_freem(m);
1268 return (-1);
1269 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1270 IP6STAT_INC(ip6s_badoptions);
1271 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1272 return (-1);
1273 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1274 IP6STAT_INC(ip6s_badoptions);
1275 ip6 = mtod(m, struct ip6_hdr *);
1276 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1277 (m->m_flags & (M_BCAST|M_MCAST)))
1278 m_freem(m);
1279 else
1280 icmp6_error(m, ICMP6_PARAM_PROB,
1281 ICMP6_PARAMPROB_OPTION, off);
1282 return (-1);
1283 }
1284
1285 m_freem(m); /* XXX: NOTREACHED */
1286 return (-1);
1287 }
1288
1289 /*
1290 * Create the "control" list for this pcb.
1291 * These functions will not modify mbuf chain at all.
1292 *
1293 * With KAME mbuf chain restriction:
1294 * The routine will be called from upper layer handlers like tcp6_input().
1295 * Thus the routine assumes that the caller (tcp6_input) have already
1296 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1297 * very first mbuf on the mbuf chain.
1298 *
1299 * ip6_savecontrol_v4 will handle those options that are possible to be
1300 * set on a v4-mapped socket.
1301 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1302 * options and handle the v6-only ones itself.
1303 */
1304 struct mbuf **
1305 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1306 int *v4only)
1307 {
1308 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1309
1310 #ifdef SO_TIMESTAMP
1311 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1312 struct timeval tv;
1313
1314 microtime(&tv);
1315 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1316 SCM_TIMESTAMP, SOL_SOCKET);
1317 if (*mp)
1318 mp = &(*mp)->m_next;
1319 }
1320 #endif
1321
1322 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1323 /* RFC 2292 sec. 5 */
1324 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1325 struct in6_pktinfo pi6;
1326
1327 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1328 #ifdef INET
1329 struct ip *ip;
1330
1331 ip = mtod(m, struct ip *);
1332 pi6.ipi6_addr.s6_addr32[0] = 0;
1333 pi6.ipi6_addr.s6_addr32[1] = 0;
1334 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1335 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1336 #else
1337 /* We won't hit this code */
1338 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1339 #endif
1340 } else {
1341 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1342 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1343 }
1344 pi6.ipi6_ifindex =
1345 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1346
1347 *mp = sbcreatecontrol((caddr_t) &pi6,
1348 sizeof(struct in6_pktinfo),
1349 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1350 if (*mp)
1351 mp = &(*mp)->m_next;
1352 }
1353
1354 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1355 int hlim;
1356
1357 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1358 #ifdef INET
1359 struct ip *ip;
1360
1361 ip = mtod(m, struct ip *);
1362 hlim = ip->ip_ttl;
1363 #else
1364 /* We won't hit this code */
1365 hlim = 0;
1366 #endif
1367 } else {
1368 hlim = ip6->ip6_hlim & 0xff;
1369 }
1370 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1371 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1372 IPPROTO_IPV6);
1373 if (*mp)
1374 mp = &(*mp)->m_next;
1375 }
1376
1377 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1378 int tclass;
1379
1380 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1381 #ifdef INET
1382 struct ip *ip;
1383
1384 ip = mtod(m, struct ip *);
1385 tclass = ip->ip_tos;
1386 #else
1387 /* We won't hit this code */
1388 tclass = 0;
1389 #endif
1390 } else {
1391 u_int32_t flowinfo;
1392
1393 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1394 flowinfo >>= 20;
1395 tclass = flowinfo & 0xff;
1396 }
1397 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1398 IPV6_TCLASS, IPPROTO_IPV6);
1399 if (*mp)
1400 mp = &(*mp)->m_next;
1401 }
1402
1403 if (v4only != NULL) {
1404 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1405 *v4only = 1;
1406 } else {
1407 *v4only = 0;
1408 }
1409 }
1410
1411 return (mp);
1412 }
1413
1414 void
1415 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1416 {
1417 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1418 int v4only = 0;
1419
1420 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1421 if (v4only)
1422 return;
1423
1424 /*
1425 * IPV6_HOPOPTS socket option. Recall that we required super-user
1426 * privilege for the option (see ip6_ctloutput), but it might be too
1427 * strict, since there might be some hop-by-hop options which can be
1428 * returned to normal user.
1429 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1430 */
1431 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1432 /*
1433 * Check if a hop-by-hop options header is contatined in the
1434 * received packet, and if so, store the options as ancillary
1435 * data. Note that a hop-by-hop options header must be
1436 * just after the IPv6 header, which is assured through the
1437 * IPv6 input processing.
1438 */
1439 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1440 struct ip6_hbh *hbh;
1441 int hbhlen = 0;
1442 #ifdef PULLDOWN_TEST
1443 struct mbuf *ext;
1444 #endif
1445
1446 #ifndef PULLDOWN_TEST
1447 hbh = (struct ip6_hbh *)(ip6 + 1);
1448 hbhlen = (hbh->ip6h_len + 1) << 3;
1449 #else
1450 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1451 ip6->ip6_nxt);
1452 if (ext == NULL) {
1453 IP6STAT_INC(ip6s_tooshort);
1454 return;
1455 }
1456 hbh = mtod(ext, struct ip6_hbh *);
1457 hbhlen = (hbh->ip6h_len + 1) << 3;
1458 if (hbhlen != ext->m_len) {
1459 m_freem(ext);
1460 IP6STAT_INC(ip6s_tooshort);
1461 return;
1462 }
1463 #endif
1464
1465 /*
1466 * XXX: We copy the whole header even if a
1467 * jumbo payload option is included, the option which
1468 * is to be removed before returning according to
1469 * RFC2292.
1470 * Note: this constraint is removed in RFC3542
1471 */
1472 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1473 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1474 IPPROTO_IPV6);
1475 if (*mp)
1476 mp = &(*mp)->m_next;
1477 #ifdef PULLDOWN_TEST
1478 m_freem(ext);
1479 #endif
1480 }
1481 }
1482
1483 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1484 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1485
1486 /*
1487 * Search for destination options headers or routing
1488 * header(s) through the header chain, and stores each
1489 * header as ancillary data.
1490 * Note that the order of the headers remains in
1491 * the chain of ancillary data.
1492 */
1493 while (1) { /* is explicit loop prevention necessary? */
1494 struct ip6_ext *ip6e = NULL;
1495 int elen;
1496 #ifdef PULLDOWN_TEST
1497 struct mbuf *ext = NULL;
1498 #endif
1499
1500 /*
1501 * if it is not an extension header, don't try to
1502 * pull it from the chain.
1503 */
1504 switch (nxt) {
1505 case IPPROTO_DSTOPTS:
1506 case IPPROTO_ROUTING:
1507 case IPPROTO_HOPOPTS:
1508 case IPPROTO_AH: /* is it possible? */
1509 break;
1510 default:
1511 goto loopend;
1512 }
1513
1514 #ifndef PULLDOWN_TEST
1515 if (off + sizeof(*ip6e) > m->m_len)
1516 goto loopend;
1517 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1518 if (nxt == IPPROTO_AH)
1519 elen = (ip6e->ip6e_len + 2) << 2;
1520 else
1521 elen = (ip6e->ip6e_len + 1) << 3;
1522 if (off + elen > m->m_len)
1523 goto loopend;
1524 #else
1525 ext = ip6_pullexthdr(m, off, nxt);
1526 if (ext == NULL) {
1527 IP6STAT_INC(ip6s_tooshort);
1528 return;
1529 }
1530 ip6e = mtod(ext, struct ip6_ext *);
1531 if (nxt == IPPROTO_AH)
1532 elen = (ip6e->ip6e_len + 2) << 2;
1533 else
1534 elen = (ip6e->ip6e_len + 1) << 3;
1535 if (elen != ext->m_len) {
1536 m_freem(ext);
1537 IP6STAT_INC(ip6s_tooshort);
1538 return;
1539 }
1540 #endif
1541
1542 switch (nxt) {
1543 case IPPROTO_DSTOPTS:
1544 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1545 break;
1546
1547 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1548 IS2292(in6p,
1549 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1550 IPPROTO_IPV6);
1551 if (*mp)
1552 mp = &(*mp)->m_next;
1553 break;
1554 case IPPROTO_ROUTING:
1555 if (!(in6p->inp_flags & IN6P_RTHDR))
1556 break;
1557
1558 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1559 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1560 IPPROTO_IPV6);
1561 if (*mp)
1562 mp = &(*mp)->m_next;
1563 break;
1564 case IPPROTO_HOPOPTS:
1565 case IPPROTO_AH: /* is it possible? */
1566 break;
1567
1568 default:
1569 /*
1570 * other cases have been filtered in the above.
1571 * none will visit this case. here we supply
1572 * the code just in case (nxt overwritten or
1573 * other cases).
1574 */
1575 #ifdef PULLDOWN_TEST
1576 m_freem(ext);
1577 #endif
1578 goto loopend;
1579
1580 }
1581
1582 /* proceed with the next header. */
1583 off += elen;
1584 nxt = ip6e->ip6e_nxt;
1585 ip6e = NULL;
1586 #ifdef PULLDOWN_TEST
1587 m_freem(ext);
1588 ext = NULL;
1589 #endif
1590 }
1591 loopend:
1592 ;
1593 }
1594 }
1595 #undef IS2292
1596
1597 void
1598 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1599 {
1600 struct socket *so;
1601 struct mbuf *m_mtu;
1602 struct ip6_mtuinfo mtuctl;
1603
1604 so = in6p->inp_socket;
1605
1606 if (mtu == NULL)
1607 return;
1608
1609 #ifdef DIAGNOSTIC
1610 if (so == NULL) /* I believe this is impossible */
1611 panic("ip6_notify_pmtu: socket is NULL");
1612 #endif
1613
1614 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1615 mtuctl.ip6m_mtu = *mtu;
1616 mtuctl.ip6m_addr = *dst;
1617 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1618 return;
1619
1620 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1621 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1622 return;
1623
1624 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1625 == 0) {
1626 m_freem(m_mtu);
1627 /* XXX: should count statistics */
1628 } else
1629 sorwakeup(so);
1630
1631 return;
1632 }
1633
1634 #ifdef PULLDOWN_TEST
1635 /*
1636 * pull single extension header from mbuf chain. returns single mbuf that
1637 * contains the result, or NULL on error.
1638 */
1639 static struct mbuf *
1640 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1641 {
1642 struct ip6_ext ip6e;
1643 size_t elen;
1644 struct mbuf *n;
1645
1646 #ifdef DIAGNOSTIC
1647 switch (nxt) {
1648 case IPPROTO_DSTOPTS:
1649 case IPPROTO_ROUTING:
1650 case IPPROTO_HOPOPTS:
1651 case IPPROTO_AH: /* is it possible? */
1652 break;
1653 default:
1654 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1655 }
1656 #endif
1657
1658 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1659 if (nxt == IPPROTO_AH)
1660 elen = (ip6e.ip6e_len + 2) << 2;
1661 else
1662 elen = (ip6e.ip6e_len + 1) << 3;
1663
1664 MGET(n, M_DONTWAIT, MT_DATA);
1665 if (n && elen >= MLEN) {
1666 MCLGET(n, M_DONTWAIT);
1667 if ((n->m_flags & M_EXT) == 0) {
1668 m_free(n);
1669 n = NULL;
1670 }
1671 }
1672 if (!n)
1673 return NULL;
1674
1675 n->m_len = 0;
1676 if (elen >= M_TRAILINGSPACE(n)) {
1677 m_free(n);
1678 return NULL;
1679 }
1680
1681 m_copydata(m, off, elen, mtod(n, caddr_t));
1682 n->m_len = elen;
1683 return n;
1684 }
1685 #endif
1686
1687 /*
1688 * Get pointer to the previous header followed by the header
1689 * currently processed.
1690 * XXX: This function supposes that
1691 * M includes all headers,
1692 * the next header field and the header length field of each header
1693 * are valid, and
1694 * the sum of each header length equals to OFF.
1695 * Because of these assumptions, this function must be called very
1696 * carefully. Moreover, it will not be used in the near future when
1697 * we develop `neater' mechanism to process extension headers.
1698 */
1699 char *
1700 ip6_get_prevhdr(struct mbuf *m, int off)
1701 {
1702 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1703
1704 if (off == sizeof(struct ip6_hdr))
1705 return (&ip6->ip6_nxt);
1706 else {
1707 int len, nxt;
1708 struct ip6_ext *ip6e = NULL;
1709
1710 nxt = ip6->ip6_nxt;
1711 len = sizeof(struct ip6_hdr);
1712 while (len < off) {
1713 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1714
1715 switch (nxt) {
1716 case IPPROTO_FRAGMENT:
1717 len += sizeof(struct ip6_frag);
1718 break;
1719 case IPPROTO_AH:
1720 len += (ip6e->ip6e_len + 2) << 2;
1721 break;
1722 default:
1723 len += (ip6e->ip6e_len + 1) << 3;
1724 break;
1725 }
1726 nxt = ip6e->ip6e_nxt;
1727 }
1728 if (ip6e)
1729 return (&ip6e->ip6e_nxt);
1730 else
1731 return NULL;
1732 }
1733 }
1734
1735 /*
1736 * get next header offset. m will be retained.
1737 */
1738 int
1739 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1740 {
1741 struct ip6_hdr ip6;
1742 struct ip6_ext ip6e;
1743 struct ip6_frag fh;
1744
1745 /* just in case */
1746 if (m == NULL)
1747 panic("ip6_nexthdr: m == NULL");
1748 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1749 return -1;
1750
1751 switch (proto) {
1752 case IPPROTO_IPV6:
1753 if (m->m_pkthdr.len < off + sizeof(ip6))
1754 return -1;
1755 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1756 if (nxtp)
1757 *nxtp = ip6.ip6_nxt;
1758 off += sizeof(ip6);
1759 return off;
1760
1761 case IPPROTO_FRAGMENT:
1762 /*
1763 * terminate parsing if it is not the first fragment,
1764 * it does not make sense to parse through it.
1765 */
1766 if (m->m_pkthdr.len < off + sizeof(fh))
1767 return -1;
1768 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1769 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1770 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1771 return -1;
1772 if (nxtp)
1773 *nxtp = fh.ip6f_nxt;
1774 off += sizeof(struct ip6_frag);
1775 return off;
1776
1777 case IPPROTO_AH:
1778 if (m->m_pkthdr.len < off + sizeof(ip6e))
1779 return -1;
1780 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1781 if (nxtp)
1782 *nxtp = ip6e.ip6e_nxt;
1783 off += (ip6e.ip6e_len + 2) << 2;
1784 return off;
1785
1786 case IPPROTO_HOPOPTS:
1787 case IPPROTO_ROUTING:
1788 case IPPROTO_DSTOPTS:
1789 if (m->m_pkthdr.len < off + sizeof(ip6e))
1790 return -1;
1791 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1792 if (nxtp)
1793 *nxtp = ip6e.ip6e_nxt;
1794 off += (ip6e.ip6e_len + 1) << 3;
1795 return off;
1796
1797 case IPPROTO_NONE:
1798 case IPPROTO_ESP:
1799 case IPPROTO_IPCOMP:
1800 /* give up */
1801 return -1;
1802
1803 default:
1804 return -1;
1805 }
1806
1807 return -1;
1808 }
1809
1810 /*
1811 * get offset for the last header in the chain. m will be kept untainted.
1812 */
1813 int
1814 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1815 {
1816 int newoff;
1817 int nxt;
1818
1819 if (!nxtp) {
1820 nxt = -1;
1821 nxtp = &nxt;
1822 }
1823 while (1) {
1824 newoff = ip6_nexthdr(m, off, proto, nxtp);
1825 if (newoff < 0)
1826 return off;
1827 else if (newoff < off)
1828 return -1; /* invalid */
1829 else if (newoff == off)
1830 return newoff;
1831
1832 off = newoff;
1833 proto = *nxtp;
1834 }
1835 }
1836
1837 static struct ip6aux *
1838 ip6_addaux(struct mbuf *m)
1839 {
1840 struct m_tag *mtag;
1841
1842 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1843 if (!mtag) {
1844 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1845 M_NOWAIT);
1846 if (mtag) {
1847 m_tag_prepend(m, mtag);
1848 bzero(mtag + 1, sizeof(struct ip6aux));
1849 }
1850 }
1851 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1852 }
1853
1854 static struct ip6aux *
1855 ip6_findaux(struct mbuf *m)
1856 {
1857 struct m_tag *mtag;
1858
1859 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1860 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1861 }
1862
1863 static void
1864 ip6_delaux(struct mbuf *m)
1865 {
1866 struct m_tag *mtag;
1867
1868 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1869 if (mtag)
1870 m_tag_delete(m, mtag);
1871 }
1872
1873 /*
1874 * System control for IP6
1875 */
1876
1877 u_char inet6ctlerrmap[PRC_NCMDS] = {
1878 0, 0, 0, 0,
1879 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1880 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1881 EMSGSIZE, EHOSTUNREACH, 0, 0,
1882 0, 0, 0, 0,
1883 ENOPROTOOPT
1884 };
Cache object: 035cdd065e89962ca7332041736e2178
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