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/10.0/sys/netinet6/ip6_input.c 255523 2013-09-13 18:45:10Z trociny $");
65
66 #include "opt_inet.h"
67 #include "opt_inet6.h"
68 #include "opt_ipfw.h"
69 #include "opt_ipsec.h"
70 #include "opt_kdtrace.h"
71 #include "opt_route.h"
72
73 #include <sys/param.h>
74 #include <sys/systm.h>
75 #include <sys/malloc.h>
76 #include <sys/mbuf.h>
77 #include <sys/proc.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
80 #include <sys/sdt.h>
81 #include <sys/socket.h>
82 #include <sys/socketvar.h>
83 #include <sys/errno.h>
84 #include <sys/time.h>
85 #include <sys/kernel.h>
86 #include <sys/syslog.h>
87
88 #include <net/if.h>
89 #include <net/if_types.h>
90 #include <net/if_dl.h>
91 #include <net/route.h>
92 #include <net/netisr.h>
93 #include <net/pfil.h>
94 #include <net/vnet.h>
95
96 #include <netinet/in.h>
97 #include <netinet/in_kdtrace.h>
98 #include <netinet/ip_var.h>
99 #include <netinet/in_systm.h>
100 #include <net/if_llatbl.h>
101 #ifdef INET
102 #include <netinet/ip.h>
103 #include <netinet/ip_icmp.h>
104 #endif /* INET */
105 #include <netinet/ip6.h>
106 #include <netinet6/in6_var.h>
107 #include <netinet6/ip6_var.h>
108 #include <netinet/in_pcb.h>
109 #include <netinet/icmp6.h>
110 #include <netinet6/scope6_var.h>
111 #include <netinet6/in6_ifattach.h>
112 #include <netinet6/nd6.h>
113
114 #ifdef IPSEC
115 #include <netipsec/ipsec.h>
116 #include <netinet6/ip6_ipsec.h>
117 #include <netipsec/ipsec6.h>
118 #endif /* IPSEC */
119
120 #include <netinet6/ip6protosw.h>
121
122 #ifdef FLOWTABLE
123 #include <net/flowtable.h>
124 VNET_DECLARE(int, ip6_output_flowtable_size);
125 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size)
126 #endif
127
128 extern struct domain inet6domain;
129
130 u_char ip6_protox[IPPROTO_MAX];
131 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
132 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
133 VNET_DEFINE(u_long, in6_ifaddrhmask);
134
135 static struct netisr_handler ip6_nh = {
136 .nh_name = "ip6",
137 .nh_handler = ip6_input,
138 .nh_proto = NETISR_IPV6,
139 .nh_policy = NETISR_POLICY_FLOW,
140 };
141
142 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch);
143 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch)
144
145 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
146
147 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
148 VNET_PCPUSTAT_SYSINIT(ip6stat);
149 #ifdef VIMAGE
150 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
151 #endif /* VIMAGE */
152
153 struct rwlock in6_ifaddr_lock;
154 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
155
156 static void ip6_init2(void *);
157 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *);
158 static struct ip6aux *ip6_addaux(struct mbuf *);
159 static struct ip6aux *ip6_findaux(struct mbuf *m);
160 static void ip6_delaux (struct mbuf *);
161 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
162 #ifdef PULLDOWN_TEST
163 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
164 #endif
165
166 /*
167 * IP6 initialization: fill in IP6 protocol switch table.
168 * All protocols not implemented in kernel go to raw IP6 protocol handler.
169 */
170 void
171 ip6_init(void)
172 {
173 struct ip6protosw *pr;
174 int i;
175
176 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
177 &V_ip6_auto_linklocal);
178 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
179 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
180
181 TAILQ_INIT(&V_in6_ifaddrhead);
182 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
183 &V_in6_ifaddrhmask);
184
185 /* Initialize packet filter hooks. */
186 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
187 V_inet6_pfil_hook.ph_af = AF_INET6;
188 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
189 printf("%s: WARNING: unable to register pfil hook, "
190 "error %d\n", __func__, i);
191
192 scope6_init();
193 addrsel_policy_init();
194 nd6_init();
195 frag6_init();
196
197 #ifdef FLOWTABLE
198 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size",
199 &V_ip6_output_flowtable_size)) {
200 if (V_ip6_output_flowtable_size < 256)
201 V_ip6_output_flowtable_size = 256;
202 if (!powerof2(V_ip6_output_flowtable_size)) {
203 printf("flowtable must be power of 2 size\n");
204 V_ip6_output_flowtable_size = 2048;
205 }
206 } else {
207 /*
208 * round up to the next power of 2
209 */
210 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1);
211 }
212 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU);
213 #endif
214
215 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
216
217 /* Skip global initialization stuff for non-default instances. */
218 if (!IS_DEFAULT_VNET(curvnet))
219 return;
220
221 #ifdef DIAGNOSTIC
222 if (sizeof(struct protosw) != sizeof(struct ip6protosw))
223 panic("sizeof(protosw) != sizeof(ip6protosw)");
224 #endif
225 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
226 if (pr == NULL)
227 panic("ip6_init");
228
229 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
230 for (i = 0; i < IPPROTO_MAX; i++)
231 ip6_protox[i] = pr - inet6sw;
232 /*
233 * Cycle through IP protocols and put them into the appropriate place
234 * in ip6_protox[].
235 */
236 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
237 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
238 if (pr->pr_domain->dom_family == PF_INET6 &&
239 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
240 /* Be careful to only index valid IP protocols. */
241 if (pr->pr_protocol < IPPROTO_MAX)
242 ip6_protox[pr->pr_protocol] = pr - inet6sw;
243 }
244
245 netisr_register(&ip6_nh);
246 }
247
248 /*
249 * The protocol to be inserted into ip6_protox[] must be already registered
250 * in inet6sw[], either statically or through pf_proto_register().
251 */
252 int
253 ip6proto_register(short ip6proto)
254 {
255 struct ip6protosw *pr;
256
257 /* Sanity checks. */
258 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
259 return (EPROTONOSUPPORT);
260
261 /*
262 * The protocol slot must not be occupied by another protocol
263 * already. An index pointing to IPPROTO_RAW is unused.
264 */
265 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
266 if (pr == NULL)
267 return (EPFNOSUPPORT);
268 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
269 return (EEXIST);
270
271 /*
272 * Find the protocol position in inet6sw[] and set the index.
273 */
274 for (pr = (struct ip6protosw *)inet6domain.dom_protosw;
275 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) {
276 if (pr->pr_domain->dom_family == PF_INET6 &&
277 pr->pr_protocol && pr->pr_protocol == ip6proto) {
278 ip6_protox[pr->pr_protocol] = pr - inet6sw;
279 return (0);
280 }
281 }
282 return (EPROTONOSUPPORT);
283 }
284
285 int
286 ip6proto_unregister(short ip6proto)
287 {
288 struct ip6protosw *pr;
289
290 /* Sanity checks. */
291 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
292 return (EPROTONOSUPPORT);
293
294 /* Check if the protocol was indeed registered. */
295 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
296 if (pr == NULL)
297 return (EPFNOSUPPORT);
298 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
299 return (ENOENT);
300
301 /* Reset the protocol slot to IPPROTO_RAW. */
302 ip6_protox[ip6proto] = pr - inet6sw;
303 return (0);
304 }
305
306 #ifdef VIMAGE
307 void
308 ip6_destroy()
309 {
310 int i;
311
312 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0)
313 printf("%s: WARNING: unable to unregister pfil hook, "
314 "error %d\n", __func__, i);
315 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
316 nd6_destroy();
317 callout_drain(&V_in6_tmpaddrtimer_ch);
318 }
319 #endif
320
321 static int
322 ip6_init2_vnet(const void *unused __unused)
323 {
324
325 /* nd6_timer_init */
326 callout_init(&V_nd6_timer_ch, 0);
327 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
328
329 /* timer for regeneranation of temporary addresses randomize ID */
330 callout_init(&V_in6_tmpaddrtimer_ch, 0);
331 callout_reset(&V_in6_tmpaddrtimer_ch,
332 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor -
333 V_ip6_temp_regen_advance) * hz,
334 in6_tmpaddrtimer, curvnet);
335
336 return (0);
337 }
338
339 static void
340 ip6_init2(void *dummy)
341 {
342
343 ip6_init2_vnet(NULL);
344 }
345
346 /* cheat */
347 /* This must be after route_init(), which is now SI_ORDER_THIRD */
348 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL);
349
350 static int
351 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off,
352 int *nxt, int *ours)
353 {
354 struct ip6_hdr *ip6;
355 struct ip6_hbh *hbh;
356
357 if (ip6_hopopts_input(plen, rtalert, &m, off)) {
358 #if 0 /*touches NULL pointer*/
359 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
360 #endif
361 goto out; /* m have already been freed */
362 }
363
364 /* adjust pointer */
365 ip6 = mtod(m, struct ip6_hdr *);
366
367 /*
368 * if the payload length field is 0 and the next header field
369 * indicates Hop-by-Hop Options header, then a Jumbo Payload
370 * option MUST be included.
371 */
372 if (ip6->ip6_plen == 0 && *plen == 0) {
373 /*
374 * Note that if a valid jumbo payload option is
375 * contained, ip6_hopopts_input() must set a valid
376 * (non-zero) payload length to the variable plen.
377 */
378 IP6STAT_INC(ip6s_badoptions);
379 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
380 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
381 icmp6_error(m, ICMP6_PARAM_PROB,
382 ICMP6_PARAMPROB_HEADER,
383 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
384 goto out;
385 }
386 #ifndef PULLDOWN_TEST
387 /* ip6_hopopts_input() ensures that mbuf is contiguous */
388 hbh = (struct ip6_hbh *)(ip6 + 1);
389 #else
390 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
391 sizeof(struct ip6_hbh));
392 if (hbh == NULL) {
393 IP6STAT_INC(ip6s_tooshort);
394 goto out;
395 }
396 #endif
397 *nxt = hbh->ip6h_nxt;
398
399 /*
400 * If we are acting as a router and the packet contains a
401 * router alert option, see if we know the option value.
402 * Currently, we only support the option value for MLD, in which
403 * case we should pass the packet to the multicast routing
404 * daemon.
405 */
406 if (*rtalert != ~0) {
407 switch (*rtalert) {
408 case IP6OPT_RTALERT_MLD:
409 if (V_ip6_forwarding)
410 *ours = 1;
411 break;
412 default:
413 /*
414 * RFC2711 requires unrecognized values must be
415 * silently ignored.
416 */
417 break;
418 }
419 }
420
421 return (0);
422
423 out:
424 return (1);
425 }
426
427 void
428 ip6_input(struct mbuf *m)
429 {
430 struct ip6_hdr *ip6;
431 int off = sizeof(struct ip6_hdr), nest;
432 u_int32_t plen;
433 u_int32_t rtalert = ~0;
434 int nxt, ours = 0;
435 struct ifnet *deliverifp = NULL, *ifp = NULL;
436 struct in6_addr odst;
437 struct route_in6 rin6;
438 int srcrt = 0;
439 struct llentry *lle = NULL;
440 struct sockaddr_in6 dst6, *dst;
441
442 bzero(&rin6, sizeof(struct route_in6));
443 #ifdef IPSEC
444 /*
445 * should the inner packet be considered authentic?
446 * see comment in ah4_input().
447 * NB: m cannot be NULL when passed to the input routine
448 */
449
450 m->m_flags &= ~M_AUTHIPHDR;
451 m->m_flags &= ~M_AUTHIPDGM;
452
453 #endif /* IPSEC */
454
455 /*
456 * make sure we don't have onion peering information into m_tag.
457 */
458 ip6_delaux(m);
459
460 if (m->m_flags & M_FASTFWD_OURS) {
461 /*
462 * Firewall changed destination to local.
463 */
464 m->m_flags &= ~M_FASTFWD_OURS;
465 ours = 1;
466 deliverifp = m->m_pkthdr.rcvif;
467 ip6 = mtod(m, struct ip6_hdr *);
468 goto hbhcheck;
469 }
470
471 /*
472 * mbuf statistics
473 */
474 if (m->m_flags & M_EXT) {
475 if (m->m_next)
476 IP6STAT_INC(ip6s_mext2m);
477 else
478 IP6STAT_INC(ip6s_mext1);
479 } else {
480 if (m->m_next) {
481 if (m->m_flags & M_LOOP) {
482 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
483 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX)
484 IP6STAT_INC(
485 ip6s_m2m[m->m_pkthdr.rcvif->if_index]);
486 else
487 IP6STAT_INC(ip6s_m2m[0]);
488 } else
489 IP6STAT_INC(ip6s_m1);
490 }
491
492 /* drop the packet if IPv6 operation is disabled on the IF */
493 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
494 m_freem(m);
495 return;
496 }
497
498 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
499 IP6STAT_INC(ip6s_total);
500
501 #ifndef PULLDOWN_TEST
502 /*
503 * L2 bridge code and some other code can return mbuf chain
504 * that does not conform to KAME requirement. too bad.
505 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
506 */
507 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
508 struct mbuf *n;
509
510 if (m->m_pkthdr.len > MHLEN)
511 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
512 else
513 n = m_gethdr(M_NOWAIT, MT_DATA);
514 if (n == NULL) {
515 m_freem(m);
516 return; /* ENOBUFS */
517 }
518
519 m_move_pkthdr(n, m);
520 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
521 n->m_len = n->m_pkthdr.len;
522 m_freem(m);
523 m = n;
524 }
525 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */);
526 #endif
527
528 if (m->m_len < sizeof(struct ip6_hdr)) {
529 struct ifnet *inifp;
530 inifp = m->m_pkthdr.rcvif;
531 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
532 IP6STAT_INC(ip6s_toosmall);
533 in6_ifstat_inc(inifp, ifs6_in_hdrerr);
534 return;
535 }
536 }
537
538 ip6 = mtod(m, struct ip6_hdr *);
539
540 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
541 IP6STAT_INC(ip6s_badvers);
542 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
543 goto bad;
544 }
545
546 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
547
548 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6);
549
550 /*
551 * Check against address spoofing/corruption.
552 */
553 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
554 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
555 /*
556 * XXX: "badscope" is not very suitable for a multicast source.
557 */
558 IP6STAT_INC(ip6s_badscope);
559 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
560 goto bad;
561 }
562 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
563 !(m->m_flags & M_LOOP)) {
564 /*
565 * In this case, the packet should come from the loopback
566 * interface. However, we cannot just check the if_flags,
567 * because ip6_mloopback() passes the "actual" interface
568 * as the outgoing/incoming interface.
569 */
570 IP6STAT_INC(ip6s_badscope);
571 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
572 goto bad;
573 }
574
575 #ifdef ALTQ
576 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
577 /* packet is dropped by traffic conditioner */
578 return;
579 }
580 #endif
581 /*
582 * The following check is not documented in specs. A malicious
583 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
584 * and bypass security checks (act as if it was from 127.0.0.1 by using
585 * IPv6 src ::ffff:127.0.0.1). Be cautious.
586 *
587 * This check chokes if we are in an SIIT cloud. As none of BSDs
588 * support IPv4-less kernel compilation, we cannot support SIIT
589 * environment at all. So, it makes more sense for us to reject any
590 * malicious packets for non-SIIT environment, than try to do a
591 * partial support for SIIT environment.
592 */
593 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
594 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
595 IP6STAT_INC(ip6s_badscope);
596 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
597 goto bad;
598 }
599 #if 0
600 /*
601 * Reject packets with IPv4 compatible addresses (auto tunnel).
602 *
603 * The code forbids auto tunnel relay case in RFC1933 (the check is
604 * stronger than RFC1933). We may want to re-enable it if mech-xx
605 * is revised to forbid relaying case.
606 */
607 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
608 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
609 IP6STAT_INC(ip6s_badscope);
610 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
611 goto bad;
612 }
613 #endif
614 #ifdef IPSEC
615 /*
616 * Bypass packet filtering for packets previously handled by IPsec.
617 */
618 if (ip6_ipsec_filtertunnel(m))
619 goto passin;
620 #endif /* IPSEC */
621
622 /*
623 * Run through list of hooks for input packets.
624 *
625 * NB: Beware of the destination address changing
626 * (e.g. by NAT rewriting). When this happens,
627 * tell ip6_forward to do the right thing.
628 */
629 odst = ip6->ip6_dst;
630
631 /* Jump over all PFIL processing if hooks are not active. */
632 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
633 goto passin;
634
635 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
636 m->m_pkthdr.rcvif, PFIL_IN, NULL))
637 return;
638 if (m == NULL) /* consumed by filter */
639 return;
640 ip6 = mtod(m, struct ip6_hdr *);
641 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
642
643 if (m->m_flags & M_FASTFWD_OURS) {
644 m->m_flags &= ~M_FASTFWD_OURS;
645 ours = 1;
646 deliverifp = m->m_pkthdr.rcvif;
647 goto hbhcheck;
648 }
649 if ((m->m_flags & M_IP6_NEXTHOP) &&
650 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
651 /*
652 * Directly ship the packet on. This allows forwarding
653 * packets originally destined to us to some other directly
654 * connected host.
655 */
656 ip6_forward(m, 1);
657 goto out;
658 }
659
660 passin:
661 /*
662 * Disambiguate address scope zones (if there is ambiguity).
663 * We first make sure that the original source or destination address
664 * is not in our internal form for scoped addresses. Such addresses
665 * are not necessarily invalid spec-wise, but we cannot accept them due
666 * to the usage conflict.
667 * in6_setscope() then also checks and rejects the cases where src or
668 * dst are the loopback address and the receiving interface
669 * is not loopback.
670 */
671 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
672 IP6STAT_INC(ip6s_badscope); /* XXX */
673 goto bad;
674 }
675 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
676 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
677 IP6STAT_INC(ip6s_badscope);
678 goto bad;
679 }
680
681 /*
682 * Multicast check. Assume packet is for us to avoid
683 * prematurely taking locks.
684 */
685 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
686 ours = 1;
687 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
688 deliverifp = m->m_pkthdr.rcvif;
689 goto hbhcheck;
690 }
691
692 /*
693 * Unicast check
694 */
695
696 bzero(&dst6, sizeof(dst6));
697 dst6.sin6_family = AF_INET6;
698 dst6.sin6_len = sizeof(struct sockaddr_in6);
699 dst6.sin6_addr = ip6->ip6_dst;
700 ifp = m->m_pkthdr.rcvif;
701 IF_AFDATA_RLOCK(ifp);
702 lle = lla_lookup(LLTABLE6(ifp), 0,
703 (struct sockaddr *)&dst6);
704 IF_AFDATA_RUNLOCK(ifp);
705 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) {
706 struct ifaddr *ifa;
707 struct in6_ifaddr *ia6;
708 int bad;
709
710 bad = 1;
711 #define sa_equal(a1, a2) \
712 (bcmp((a1), (a2), ((a1))->sin6_len) == 0)
713 IF_ADDR_RLOCK(ifp);
714 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
715 if (ifa->ifa_addr->sa_family != dst6.sin6_family)
716 continue;
717 if (sa_equal(&dst6, ifa->ifa_addr))
718 break;
719 }
720 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p",
721 __func__, lle));
722 #undef sa_equal
723
724 ia6 = (struct in6_ifaddr *)ifa;
725 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
726 /* Count the packet in the ip address stats */
727 ia6->ia_ifa.if_ipackets++;
728 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
729
730 /*
731 * record address information into m_tag.
732 */
733 (void)ip6_setdstifaddr(m, ia6);
734
735 bad = 0;
736 } else {
737 char ip6bufs[INET6_ADDRSTRLEN];
738 char ip6bufd[INET6_ADDRSTRLEN];
739 /* address is not ready, so discard the packet. */
740 nd6log((LOG_INFO,
741 "ip6_input: packet to an unready address %s->%s\n",
742 ip6_sprintf(ip6bufs, &ip6->ip6_src),
743 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
744 }
745 IF_ADDR_RUNLOCK(ifp);
746 LLE_RUNLOCK(lle);
747 if (bad)
748 goto bad;
749 else {
750 ours = 1;
751 deliverifp = ifp;
752 goto hbhcheck;
753 }
754 }
755 if (lle != NULL)
756 LLE_RUNLOCK(lle);
757
758 dst = &rin6.ro_dst;
759 dst->sin6_len = sizeof(struct sockaddr_in6);
760 dst->sin6_family = AF_INET6;
761 dst->sin6_addr = ip6->ip6_dst;
762 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m));
763 if (rin6.ro_rt)
764 RT_UNLOCK(rin6.ro_rt);
765
766 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
767
768 /*
769 * Accept the packet if the forwarding interface to the destination
770 * according to the routing table is the loopback interface,
771 * unless the associated route has a gateway.
772 * Note that this approach causes to accept a packet if there is a
773 * route to the loopback interface for the destination of the packet.
774 * But we think it's even useful in some situations, e.g. when using
775 * a special daemon which wants to intercept the packet.
776 *
777 * XXX: some OSes automatically make a cloned route for the destination
778 * of an outgoing packet. If the outgoing interface of the packet
779 * is a loopback one, the kernel would consider the packet to be
780 * accepted, even if we have no such address assinged on the interface.
781 * We check the cloned flag of the route entry to reject such cases,
782 * assuming that route entries for our own addresses are not made by
783 * cloning (it should be true because in6_addloop explicitly installs
784 * the host route). However, we might have to do an explicit check
785 * while it would be less efficient. Or, should we rather install a
786 * reject route for such a case?
787 */
788 if (rin6.ro_rt &&
789 (rin6.ro_rt->rt_flags &
790 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
791 #ifdef RTF_WASCLONED
792 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) &&
793 #endif
794 #ifdef RTF_CLONED
795 !(rin6.ro_rt->rt_flags & RTF_CLONED) &&
796 #endif
797 #if 0
798 /*
799 * The check below is redundant since the comparison of
800 * the destination and the key of the rtentry has
801 * already done through looking up the routing table.
802 */
803 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
804 &rt6_key(rin6.ro_rt)->sin6_addr)
805 #endif
806 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
807 int free_ia6 = 0;
808 struct in6_ifaddr *ia6;
809
810 /*
811 * found the loopback route to the interface address
812 */
813 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
814 struct sockaddr_in6 dest6;
815
816 bzero(&dest6, sizeof(dest6));
817 dest6.sin6_family = AF_INET6;
818 dest6.sin6_len = sizeof(dest6);
819 dest6.sin6_addr = ip6->ip6_dst;
820 ia6 = (struct in6_ifaddr *)
821 ifa_ifwithaddr((struct sockaddr *)&dest6);
822 if (ia6 == NULL)
823 goto bad;
824 free_ia6 = 1;
825 }
826 else
827 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
828
829 /*
830 * record address information into m_tag.
831 */
832 (void)ip6_setdstifaddr(m, ia6);
833
834 /*
835 * packets to a tentative, duplicated, or somehow invalid
836 * address must not be accepted.
837 */
838 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
839 /* this address is ready */
840 ours = 1;
841 deliverifp = ia6->ia_ifp; /* correct? */
842 /* Count the packet in the ip address stats */
843 ia6->ia_ifa.if_ipackets++;
844 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
845 if (ia6 != NULL && free_ia6 != 0)
846 ifa_free(&ia6->ia_ifa);
847 goto hbhcheck;
848 } else {
849 char ip6bufs[INET6_ADDRSTRLEN];
850 char ip6bufd[INET6_ADDRSTRLEN];
851 /* address is not ready, so discard the packet. */
852 nd6log((LOG_INFO,
853 "ip6_input: packet to an unready address %s->%s\n",
854 ip6_sprintf(ip6bufs, &ip6->ip6_src),
855 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
856
857 if (ia6 != NULL && free_ia6 != 0)
858 ifa_free(&ia6->ia_ifa);
859 goto bad;
860 }
861 }
862
863 /*
864 * FAITH (Firewall Aided Internet Translator)
865 */
866 if (V_ip6_keepfaith) {
867 if (rin6.ro_rt && rin6.ro_rt->rt_ifp &&
868 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) {
869 /* XXX do we need more sanity checks? */
870 ours = 1;
871 deliverifp = rin6.ro_rt->rt_ifp; /* faith */
872 goto hbhcheck;
873 }
874 }
875
876 /*
877 * Now there is no reason to process the packet if it's not our own
878 * and we're not a router.
879 */
880 if (!V_ip6_forwarding) {
881 IP6STAT_INC(ip6s_cantforward);
882 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
883 goto bad;
884 }
885
886 hbhcheck:
887 /*
888 * record address information into m_tag, if we don't have one yet.
889 * note that we are unable to record it, if the address is not listed
890 * as our interface address (e.g. multicast addresses, addresses
891 * within FAITH prefixes and such).
892 */
893 if (deliverifp) {
894 struct in6_ifaddr *ia6;
895
896 if ((ia6 = ip6_getdstifaddr(m)) != NULL) {
897 ifa_free(&ia6->ia_ifa);
898 } else {
899 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
900 if (ia6) {
901 if (!ip6_setdstifaddr(m, ia6)) {
902 /*
903 * XXX maybe we should drop the packet here,
904 * as we could not provide enough information
905 * to the upper layers.
906 */
907 }
908 ifa_free(&ia6->ia_ifa);
909 }
910 }
911 }
912
913 /*
914 * Process Hop-by-Hop options header if it's contained.
915 * m may be modified in ip6_hopopts_input().
916 * If a JumboPayload option is included, plen will also be modified.
917 */
918 plen = (u_int32_t)ntohs(ip6->ip6_plen);
919 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
920 int error;
921
922 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours);
923 if (error != 0)
924 goto out;
925 } else
926 nxt = ip6->ip6_nxt;
927
928 /*
929 * Check that the amount of data in the buffers
930 * is as at least much as the IPv6 header would have us expect.
931 * Trim mbufs if longer than we expect.
932 * Drop packet if shorter than we expect.
933 */
934 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
935 IP6STAT_INC(ip6s_tooshort);
936 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
937 goto bad;
938 }
939 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
940 if (m->m_len == m->m_pkthdr.len) {
941 m->m_len = sizeof(struct ip6_hdr) + plen;
942 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
943 } else
944 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
945 }
946
947 /*
948 * Forward if desirable.
949 */
950 if (V_ip6_mrouter &&
951 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
952 /*
953 * If we are acting as a multicast router, all
954 * incoming multicast packets are passed to the
955 * kernel-level multicast forwarding function.
956 * The packet is returned (relatively) intact; if
957 * ip6_mforward() returns a non-zero value, the packet
958 * must be discarded, else it may be accepted below.
959 *
960 * XXX TODO: Check hlim and multicast scope here to avoid
961 * unnecessarily calling into ip6_mforward().
962 */
963 if (ip6_mforward &&
964 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
965 IP6STAT_INC(ip6s_cantforward);
966 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
967 goto bad;
968 }
969 } else if (!ours) {
970 ip6_forward(m, srcrt);
971 goto out;
972 }
973
974 ip6 = mtod(m, struct ip6_hdr *);
975
976 /*
977 * Malicious party may be able to use IPv4 mapped addr to confuse
978 * tcp/udp stack and bypass security checks (act as if it was from
979 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
980 *
981 * For SIIT end node behavior, you may want to disable the check.
982 * However, you will become vulnerable to attacks using IPv4 mapped
983 * source.
984 */
985 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
986 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
987 IP6STAT_INC(ip6s_badscope);
988 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
989 goto bad;
990 }
991
992 /*
993 * Tell launch routine the next header
994 */
995 IP6STAT_INC(ip6s_delivered);
996 in6_ifstat_inc(deliverifp, ifs6_in_deliver);
997 nest = 0;
998
999 while (nxt != IPPROTO_DONE) {
1000 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
1001 IP6STAT_INC(ip6s_toomanyhdr);
1002 goto bad;
1003 }
1004
1005 /*
1006 * protection against faulty packet - there should be
1007 * more sanity checks in header chain processing.
1008 */
1009 if (m->m_pkthdr.len < off) {
1010 IP6STAT_INC(ip6s_tooshort);
1011 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
1012 goto bad;
1013 }
1014
1015 #ifdef IPSEC
1016 /*
1017 * enforce IPsec policy checking if we are seeing last header.
1018 * note that we do not visit this with protocols with pcb layer
1019 * code - like udp/tcp/raw ip.
1020 */
1021 if (ip6_ipsec_input(m, nxt))
1022 goto bad;
1023 #endif /* IPSEC */
1024
1025 /*
1026 * Use mbuf flags to propagate Router Alert option to
1027 * ICMPv6 layer, as hop-by-hop options have been stripped.
1028 */
1029 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0)
1030 m->m_flags |= M_RTALERT_MLD;
1031
1032 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
1033 }
1034 goto out;
1035 bad:
1036 m_freem(m);
1037 out:
1038 if (rin6.ro_rt)
1039 RTFREE(rin6.ro_rt);
1040 }
1041
1042 /*
1043 * set/grab in6_ifaddr correspond to IPv6 destination address.
1044 * XXX backward compatibility wrapper
1045 *
1046 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag,
1047 * and then bump it when the tag is copied, and release it when the tag is
1048 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead
1049 * we just bump the ia refcount when we receive it. This should be fixed.
1050 */
1051 static struct ip6aux *
1052 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6)
1053 {
1054 struct ip6aux *ip6a;
1055
1056 ip6a = ip6_addaux(m);
1057 if (ip6a)
1058 ip6a->ip6a_dstia6 = ia6;
1059 return ip6a; /* NULL if failed to set */
1060 }
1061
1062 struct in6_ifaddr *
1063 ip6_getdstifaddr(struct mbuf *m)
1064 {
1065 struct ip6aux *ip6a;
1066 struct in6_ifaddr *ia;
1067
1068 ip6a = ip6_findaux(m);
1069 if (ip6a) {
1070 ia = ip6a->ip6a_dstia6;
1071 ifa_ref(&ia->ia_ifa);
1072 return ia;
1073 } else
1074 return NULL;
1075 }
1076
1077 /*
1078 * Hop-by-Hop options header processing. If a valid jumbo payload option is
1079 * included, the real payload length will be stored in plenp.
1080 *
1081 * rtalertp - XXX: should be stored more smart way
1082 */
1083 static int
1084 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
1085 struct mbuf **mp, int *offp)
1086 {
1087 struct mbuf *m = *mp;
1088 int off = *offp, hbhlen;
1089 struct ip6_hbh *hbh;
1090 u_int8_t *opt;
1091
1092 /* validation of the length of the header */
1093 #ifndef PULLDOWN_TEST
1094 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
1095 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1096 hbhlen = (hbh->ip6h_len + 1) << 3;
1097
1098 IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
1099 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
1100 #else
1101 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
1102 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
1103 if (hbh == NULL) {
1104 IP6STAT_INC(ip6s_tooshort);
1105 return -1;
1106 }
1107 hbhlen = (hbh->ip6h_len + 1) << 3;
1108 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
1109 hbhlen);
1110 if (hbh == NULL) {
1111 IP6STAT_INC(ip6s_tooshort);
1112 return -1;
1113 }
1114 #endif
1115 off += hbhlen;
1116 hbhlen -= sizeof(struct ip6_hbh);
1117 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh);
1118
1119 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
1120 hbhlen, rtalertp, plenp) < 0)
1121 return (-1);
1122
1123 *offp = off;
1124 *mp = m;
1125 return (0);
1126 }
1127
1128 /*
1129 * Search header for all Hop-by-hop options and process each option.
1130 * This function is separate from ip6_hopopts_input() in order to
1131 * handle a case where the sending node itself process its hop-by-hop
1132 * options header. In such a case, the function is called from ip6_output().
1133 *
1134 * The function assumes that hbh header is located right after the IPv6 header
1135 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
1136 * opthead + hbhlen is located in contiguous memory region.
1137 */
1138 int
1139 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1140 u_int32_t *rtalertp, u_int32_t *plenp)
1141 {
1142 struct ip6_hdr *ip6;
1143 int optlen = 0;
1144 u_int8_t *opt = opthead;
1145 u_int16_t rtalert_val;
1146 u_int32_t jumboplen;
1147 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1148
1149 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1150 switch (*opt) {
1151 case IP6OPT_PAD1:
1152 optlen = 1;
1153 break;
1154 case IP6OPT_PADN:
1155 if (hbhlen < IP6OPT_MINLEN) {
1156 IP6STAT_INC(ip6s_toosmall);
1157 goto bad;
1158 }
1159 optlen = *(opt + 1) + 2;
1160 break;
1161 case IP6OPT_ROUTER_ALERT:
1162 /* XXX may need check for alignment */
1163 if (hbhlen < IP6OPT_RTALERT_LEN) {
1164 IP6STAT_INC(ip6s_toosmall);
1165 goto bad;
1166 }
1167 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1168 /* XXX stat */
1169 icmp6_error(m, ICMP6_PARAM_PROB,
1170 ICMP6_PARAMPROB_HEADER,
1171 erroff + opt + 1 - opthead);
1172 return (-1);
1173 }
1174 optlen = IP6OPT_RTALERT_LEN;
1175 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1176 *rtalertp = ntohs(rtalert_val);
1177 break;
1178 case IP6OPT_JUMBO:
1179 /* XXX may need check for alignment */
1180 if (hbhlen < IP6OPT_JUMBO_LEN) {
1181 IP6STAT_INC(ip6s_toosmall);
1182 goto bad;
1183 }
1184 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1185 /* XXX stat */
1186 icmp6_error(m, ICMP6_PARAM_PROB,
1187 ICMP6_PARAMPROB_HEADER,
1188 erroff + opt + 1 - opthead);
1189 return (-1);
1190 }
1191 optlen = IP6OPT_JUMBO_LEN;
1192
1193 /*
1194 * IPv6 packets that have non 0 payload length
1195 * must not contain a jumbo payload option.
1196 */
1197 ip6 = mtod(m, struct ip6_hdr *);
1198 if (ip6->ip6_plen) {
1199 IP6STAT_INC(ip6s_badoptions);
1200 icmp6_error(m, ICMP6_PARAM_PROB,
1201 ICMP6_PARAMPROB_HEADER,
1202 erroff + opt - opthead);
1203 return (-1);
1204 }
1205
1206 /*
1207 * We may see jumbolen in unaligned location, so
1208 * we'd need to perform bcopy().
1209 */
1210 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1211 jumboplen = (u_int32_t)htonl(jumboplen);
1212
1213 #if 1
1214 /*
1215 * if there are multiple jumbo payload options,
1216 * *plenp will be non-zero and the packet will be
1217 * rejected.
1218 * the behavior may need some debate in ipngwg -
1219 * multiple options does not make sense, however,
1220 * there's no explicit mention in specification.
1221 */
1222 if (*plenp != 0) {
1223 IP6STAT_INC(ip6s_badoptions);
1224 icmp6_error(m, ICMP6_PARAM_PROB,
1225 ICMP6_PARAMPROB_HEADER,
1226 erroff + opt + 2 - opthead);
1227 return (-1);
1228 }
1229 #endif
1230
1231 /*
1232 * jumbo payload length must be larger than 65535.
1233 */
1234 if (jumboplen <= IPV6_MAXPACKET) {
1235 IP6STAT_INC(ip6s_badoptions);
1236 icmp6_error(m, ICMP6_PARAM_PROB,
1237 ICMP6_PARAMPROB_HEADER,
1238 erroff + opt + 2 - opthead);
1239 return (-1);
1240 }
1241 *plenp = jumboplen;
1242
1243 break;
1244 default: /* unknown option */
1245 if (hbhlen < IP6OPT_MINLEN) {
1246 IP6STAT_INC(ip6s_toosmall);
1247 goto bad;
1248 }
1249 optlen = ip6_unknown_opt(opt, m,
1250 erroff + opt - opthead);
1251 if (optlen == -1)
1252 return (-1);
1253 optlen += 2;
1254 break;
1255 }
1256 }
1257
1258 return (0);
1259
1260 bad:
1261 m_freem(m);
1262 return (-1);
1263 }
1264
1265 /*
1266 * Unknown option processing.
1267 * The third argument `off' is the offset from the IPv6 header to the option,
1268 * which is necessary if the IPv6 header the and option header and IPv6 header
1269 * is not contiguous in order to return an ICMPv6 error.
1270 */
1271 int
1272 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1273 {
1274 struct ip6_hdr *ip6;
1275
1276 switch (IP6OPT_TYPE(*optp)) {
1277 case IP6OPT_TYPE_SKIP: /* ignore the option */
1278 return ((int)*(optp + 1));
1279 case IP6OPT_TYPE_DISCARD: /* silently discard */
1280 m_freem(m);
1281 return (-1);
1282 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1283 IP6STAT_INC(ip6s_badoptions);
1284 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1285 return (-1);
1286 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1287 IP6STAT_INC(ip6s_badoptions);
1288 ip6 = mtod(m, struct ip6_hdr *);
1289 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1290 (m->m_flags & (M_BCAST|M_MCAST)))
1291 m_freem(m);
1292 else
1293 icmp6_error(m, ICMP6_PARAM_PROB,
1294 ICMP6_PARAMPROB_OPTION, off);
1295 return (-1);
1296 }
1297
1298 m_freem(m); /* XXX: NOTREACHED */
1299 return (-1);
1300 }
1301
1302 /*
1303 * Create the "control" list for this pcb.
1304 * These functions will not modify mbuf chain at all.
1305 *
1306 * With KAME mbuf chain restriction:
1307 * The routine will be called from upper layer handlers like tcp6_input().
1308 * Thus the routine assumes that the caller (tcp6_input) have already
1309 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the
1310 * very first mbuf on the mbuf chain.
1311 *
1312 * ip6_savecontrol_v4 will handle those options that are possible to be
1313 * set on a v4-mapped socket.
1314 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1315 * options and handle the v6-only ones itself.
1316 */
1317 struct mbuf **
1318 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1319 int *v4only)
1320 {
1321 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1322
1323 #ifdef SO_TIMESTAMP
1324 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1325 struct timeval tv;
1326
1327 microtime(&tv);
1328 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1329 SCM_TIMESTAMP, SOL_SOCKET);
1330 if (*mp)
1331 mp = &(*mp)->m_next;
1332 }
1333 #endif
1334
1335 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1336 /* RFC 2292 sec. 5 */
1337 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1338 struct in6_pktinfo pi6;
1339
1340 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1341 #ifdef INET
1342 struct ip *ip;
1343
1344 ip = mtod(m, struct ip *);
1345 pi6.ipi6_addr.s6_addr32[0] = 0;
1346 pi6.ipi6_addr.s6_addr32[1] = 0;
1347 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1348 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1349 #else
1350 /* We won't hit this code */
1351 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1352 #endif
1353 } else {
1354 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1355 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1356 }
1357 pi6.ipi6_ifindex =
1358 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1359
1360 *mp = sbcreatecontrol((caddr_t) &pi6,
1361 sizeof(struct in6_pktinfo),
1362 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1363 if (*mp)
1364 mp = &(*mp)->m_next;
1365 }
1366
1367 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1368 int hlim;
1369
1370 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1371 #ifdef INET
1372 struct ip *ip;
1373
1374 ip = mtod(m, struct ip *);
1375 hlim = ip->ip_ttl;
1376 #else
1377 /* We won't hit this code */
1378 hlim = 0;
1379 #endif
1380 } else {
1381 hlim = ip6->ip6_hlim & 0xff;
1382 }
1383 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1384 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1385 IPPROTO_IPV6);
1386 if (*mp)
1387 mp = &(*mp)->m_next;
1388 }
1389
1390 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1391 int tclass;
1392
1393 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1394 #ifdef INET
1395 struct ip *ip;
1396
1397 ip = mtod(m, struct ip *);
1398 tclass = ip->ip_tos;
1399 #else
1400 /* We won't hit this code */
1401 tclass = 0;
1402 #endif
1403 } else {
1404 u_int32_t flowinfo;
1405
1406 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1407 flowinfo >>= 20;
1408 tclass = flowinfo & 0xff;
1409 }
1410 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1411 IPV6_TCLASS, IPPROTO_IPV6);
1412 if (*mp)
1413 mp = &(*mp)->m_next;
1414 }
1415
1416 if (v4only != NULL) {
1417 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1418 *v4only = 1;
1419 } else {
1420 *v4only = 0;
1421 }
1422 }
1423
1424 return (mp);
1425 }
1426
1427 void
1428 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp)
1429 {
1430 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1431 int v4only = 0;
1432
1433 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only);
1434 if (v4only)
1435 return;
1436
1437 /*
1438 * IPV6_HOPOPTS socket option. Recall that we required super-user
1439 * privilege for the option (see ip6_ctloutput), but it might be too
1440 * strict, since there might be some hop-by-hop options which can be
1441 * returned to normal user.
1442 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1443 */
1444 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) {
1445 /*
1446 * Check if a hop-by-hop options header is contatined in the
1447 * received packet, and if so, store the options as ancillary
1448 * data. Note that a hop-by-hop options header must be
1449 * just after the IPv6 header, which is assured through the
1450 * IPv6 input processing.
1451 */
1452 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1453 struct ip6_hbh *hbh;
1454 int hbhlen = 0;
1455 #ifdef PULLDOWN_TEST
1456 struct mbuf *ext;
1457 #endif
1458
1459 #ifndef PULLDOWN_TEST
1460 hbh = (struct ip6_hbh *)(ip6 + 1);
1461 hbhlen = (hbh->ip6h_len + 1) << 3;
1462 #else
1463 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
1464 ip6->ip6_nxt);
1465 if (ext == NULL) {
1466 IP6STAT_INC(ip6s_tooshort);
1467 return;
1468 }
1469 hbh = mtod(ext, struct ip6_hbh *);
1470 hbhlen = (hbh->ip6h_len + 1) << 3;
1471 if (hbhlen != ext->m_len) {
1472 m_freem(ext);
1473 IP6STAT_INC(ip6s_tooshort);
1474 return;
1475 }
1476 #endif
1477
1478 /*
1479 * XXX: We copy the whole header even if a
1480 * jumbo payload option is included, the option which
1481 * is to be removed before returning according to
1482 * RFC2292.
1483 * Note: this constraint is removed in RFC3542
1484 */
1485 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1486 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1487 IPPROTO_IPV6);
1488 if (*mp)
1489 mp = &(*mp)->m_next;
1490 #ifdef PULLDOWN_TEST
1491 m_freem(ext);
1492 #endif
1493 }
1494 }
1495
1496 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1497 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1498
1499 /*
1500 * Search for destination options headers or routing
1501 * header(s) through the header chain, and stores each
1502 * header as ancillary data.
1503 * Note that the order of the headers remains in
1504 * the chain of ancillary data.
1505 */
1506 while (1) { /* is explicit loop prevention necessary? */
1507 struct ip6_ext *ip6e = NULL;
1508 int elen;
1509 #ifdef PULLDOWN_TEST
1510 struct mbuf *ext = NULL;
1511 #endif
1512
1513 /*
1514 * if it is not an extension header, don't try to
1515 * pull it from the chain.
1516 */
1517 switch (nxt) {
1518 case IPPROTO_DSTOPTS:
1519 case IPPROTO_ROUTING:
1520 case IPPROTO_HOPOPTS:
1521 case IPPROTO_AH: /* is it possible? */
1522 break;
1523 default:
1524 goto loopend;
1525 }
1526
1527 #ifndef PULLDOWN_TEST
1528 if (off + sizeof(*ip6e) > m->m_len)
1529 goto loopend;
1530 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1531 if (nxt == IPPROTO_AH)
1532 elen = (ip6e->ip6e_len + 2) << 2;
1533 else
1534 elen = (ip6e->ip6e_len + 1) << 3;
1535 if (off + elen > m->m_len)
1536 goto loopend;
1537 #else
1538 ext = ip6_pullexthdr(m, off, nxt);
1539 if (ext == NULL) {
1540 IP6STAT_INC(ip6s_tooshort);
1541 return;
1542 }
1543 ip6e = mtod(ext, struct ip6_ext *);
1544 if (nxt == IPPROTO_AH)
1545 elen = (ip6e->ip6e_len + 2) << 2;
1546 else
1547 elen = (ip6e->ip6e_len + 1) << 3;
1548 if (elen != ext->m_len) {
1549 m_freem(ext);
1550 IP6STAT_INC(ip6s_tooshort);
1551 return;
1552 }
1553 #endif
1554
1555 switch (nxt) {
1556 case IPPROTO_DSTOPTS:
1557 if (!(in6p->inp_flags & IN6P_DSTOPTS))
1558 break;
1559
1560 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1561 IS2292(in6p,
1562 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1563 IPPROTO_IPV6);
1564 if (*mp)
1565 mp = &(*mp)->m_next;
1566 break;
1567 case IPPROTO_ROUTING:
1568 if (!(in6p->inp_flags & IN6P_RTHDR))
1569 break;
1570
1571 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1572 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR),
1573 IPPROTO_IPV6);
1574 if (*mp)
1575 mp = &(*mp)->m_next;
1576 break;
1577 case IPPROTO_HOPOPTS:
1578 case IPPROTO_AH: /* is it possible? */
1579 break;
1580
1581 default:
1582 /*
1583 * other cases have been filtered in the above.
1584 * none will visit this case. here we supply
1585 * the code just in case (nxt overwritten or
1586 * other cases).
1587 */
1588 #ifdef PULLDOWN_TEST
1589 m_freem(ext);
1590 #endif
1591 goto loopend;
1592
1593 }
1594
1595 /* proceed with the next header. */
1596 off += elen;
1597 nxt = ip6e->ip6e_nxt;
1598 ip6e = NULL;
1599 #ifdef PULLDOWN_TEST
1600 m_freem(ext);
1601 ext = NULL;
1602 #endif
1603 }
1604 loopend:
1605 ;
1606 }
1607 }
1608 #undef IS2292
1609
1610 void
1611 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu)
1612 {
1613 struct socket *so;
1614 struct mbuf *m_mtu;
1615 struct ip6_mtuinfo mtuctl;
1616
1617 so = in6p->inp_socket;
1618
1619 if (mtu == NULL)
1620 return;
1621
1622 #ifdef DIAGNOSTIC
1623 if (so == NULL) /* I believe this is impossible */
1624 panic("ip6_notify_pmtu: socket is NULL");
1625 #endif
1626
1627 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */
1628 mtuctl.ip6m_mtu = *mtu;
1629 mtuctl.ip6m_addr = *dst;
1630 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1631 return;
1632
1633 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1634 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1635 return;
1636
1637 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1638 == 0) {
1639 m_freem(m_mtu);
1640 /* XXX: should count statistics */
1641 } else
1642 sorwakeup(so);
1643
1644 return;
1645 }
1646
1647 #ifdef PULLDOWN_TEST
1648 /*
1649 * pull single extension header from mbuf chain. returns single mbuf that
1650 * contains the result, or NULL on error.
1651 */
1652 static struct mbuf *
1653 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
1654 {
1655 struct ip6_ext ip6e;
1656 size_t elen;
1657 struct mbuf *n;
1658
1659 #ifdef DIAGNOSTIC
1660 switch (nxt) {
1661 case IPPROTO_DSTOPTS:
1662 case IPPROTO_ROUTING:
1663 case IPPROTO_HOPOPTS:
1664 case IPPROTO_AH: /* is it possible? */
1665 break;
1666 default:
1667 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
1668 }
1669 #endif
1670
1671 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1672 if (nxt == IPPROTO_AH)
1673 elen = (ip6e.ip6e_len + 2) << 2;
1674 else
1675 elen = (ip6e.ip6e_len + 1) << 3;
1676
1677 if (elen > MLEN)
1678 n = m_getcl(M_NOWAIT, MT_DATA, 0);
1679 else
1680 n = m_get(M_NOWAIT, MT_DATA);
1681 if (n == NULL)
1682 return NULL;
1683
1684 m_copydata(m, off, elen, mtod(n, caddr_t));
1685 n->m_len = elen;
1686 return n;
1687 }
1688 #endif
1689
1690 /*
1691 * Get pointer to the previous header followed by the header
1692 * currently processed.
1693 * XXX: This function supposes that
1694 * M includes all headers,
1695 * the next header field and the header length field of each header
1696 * are valid, and
1697 * the sum of each header length equals to OFF.
1698 * Because of these assumptions, this function must be called very
1699 * carefully. Moreover, it will not be used in the near future when
1700 * we develop `neater' mechanism to process extension headers.
1701 */
1702 char *
1703 ip6_get_prevhdr(struct mbuf *m, int off)
1704 {
1705 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1706
1707 if (off == sizeof(struct ip6_hdr))
1708 return (&ip6->ip6_nxt);
1709 else {
1710 int len, nxt;
1711 struct ip6_ext *ip6e = NULL;
1712
1713 nxt = ip6->ip6_nxt;
1714 len = sizeof(struct ip6_hdr);
1715 while (len < off) {
1716 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len);
1717
1718 switch (nxt) {
1719 case IPPROTO_FRAGMENT:
1720 len += sizeof(struct ip6_frag);
1721 break;
1722 case IPPROTO_AH:
1723 len += (ip6e->ip6e_len + 2) << 2;
1724 break;
1725 default:
1726 len += (ip6e->ip6e_len + 1) << 3;
1727 break;
1728 }
1729 nxt = ip6e->ip6e_nxt;
1730 }
1731 if (ip6e)
1732 return (&ip6e->ip6e_nxt);
1733 else
1734 return NULL;
1735 }
1736 }
1737
1738 /*
1739 * get next header offset. m will be retained.
1740 */
1741 int
1742 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
1743 {
1744 struct ip6_hdr ip6;
1745 struct ip6_ext ip6e;
1746 struct ip6_frag fh;
1747
1748 /* just in case */
1749 if (m == NULL)
1750 panic("ip6_nexthdr: m == NULL");
1751 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1752 return -1;
1753
1754 switch (proto) {
1755 case IPPROTO_IPV6:
1756 if (m->m_pkthdr.len < off + sizeof(ip6))
1757 return -1;
1758 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1759 if (nxtp)
1760 *nxtp = ip6.ip6_nxt;
1761 off += sizeof(ip6);
1762 return off;
1763
1764 case IPPROTO_FRAGMENT:
1765 /*
1766 * terminate parsing if it is not the first fragment,
1767 * it does not make sense to parse through it.
1768 */
1769 if (m->m_pkthdr.len < off + sizeof(fh))
1770 return -1;
1771 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1772 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1773 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1774 return -1;
1775 if (nxtp)
1776 *nxtp = fh.ip6f_nxt;
1777 off += sizeof(struct ip6_frag);
1778 return off;
1779
1780 case IPPROTO_AH:
1781 if (m->m_pkthdr.len < off + sizeof(ip6e))
1782 return -1;
1783 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1784 if (nxtp)
1785 *nxtp = ip6e.ip6e_nxt;
1786 off += (ip6e.ip6e_len + 2) << 2;
1787 return off;
1788
1789 case IPPROTO_HOPOPTS:
1790 case IPPROTO_ROUTING:
1791 case IPPROTO_DSTOPTS:
1792 if (m->m_pkthdr.len < off + sizeof(ip6e))
1793 return -1;
1794 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1795 if (nxtp)
1796 *nxtp = ip6e.ip6e_nxt;
1797 off += (ip6e.ip6e_len + 1) << 3;
1798 return off;
1799
1800 case IPPROTO_NONE:
1801 case IPPROTO_ESP:
1802 case IPPROTO_IPCOMP:
1803 /* give up */
1804 return -1;
1805
1806 default:
1807 return -1;
1808 }
1809
1810 return -1;
1811 }
1812
1813 /*
1814 * get offset for the last header in the chain. m will be kept untainted.
1815 */
1816 int
1817 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
1818 {
1819 int newoff;
1820 int nxt;
1821
1822 if (!nxtp) {
1823 nxt = -1;
1824 nxtp = &nxt;
1825 }
1826 while (1) {
1827 newoff = ip6_nexthdr(m, off, proto, nxtp);
1828 if (newoff < 0)
1829 return off;
1830 else if (newoff < off)
1831 return -1; /* invalid */
1832 else if (newoff == off)
1833 return newoff;
1834
1835 off = newoff;
1836 proto = *nxtp;
1837 }
1838 }
1839
1840 static struct ip6aux *
1841 ip6_addaux(struct mbuf *m)
1842 {
1843 struct m_tag *mtag;
1844
1845 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1846 if (!mtag) {
1847 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux),
1848 M_NOWAIT);
1849 if (mtag) {
1850 m_tag_prepend(m, mtag);
1851 bzero(mtag + 1, sizeof(struct ip6aux));
1852 }
1853 }
1854 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1855 }
1856
1857 static struct ip6aux *
1858 ip6_findaux(struct mbuf *m)
1859 {
1860 struct m_tag *mtag;
1861
1862 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1863 return mtag ? (struct ip6aux *)(mtag + 1) : NULL;
1864 }
1865
1866 static void
1867 ip6_delaux(struct mbuf *m)
1868 {
1869 struct m_tag *mtag;
1870
1871 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL);
1872 if (mtag)
1873 m_tag_delete(m, mtag);
1874 }
1875
1876 /*
1877 * System control for IP6
1878 */
1879
1880 u_char inet6ctlerrmap[PRC_NCMDS] = {
1881 0, 0, 0, 0,
1882 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1883 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1884 EMSGSIZE, EHOSTUNREACH, 0, 0,
1885 0, 0, 0, 0,
1886 ENOPROTOOPT
1887 };
Cache object: f6d3045e7042652ffc20018208223315
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