1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $
32 */
33
34 /*-
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD$");
67
68 #include "opt_inet.h"
69 #include "opt_inet6.h"
70 #include "opt_ipsec.h"
71 #include "opt_route.h"
72 #include "opt_rss.h"
73
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/hhook.h>
77 #include <sys/malloc.h>
78 #include <sys/mbuf.h>
79 #include <sys/proc.h>
80 #include <sys/domain.h>
81 #include <sys/protosw.h>
82 #include <sys/sdt.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/errno.h>
86 #include <sys/time.h>
87 #include <sys/kernel.h>
88 #include <sys/lock.h>
89 #include <sys/rmlock.h>
90 #include <sys/syslog.h>
91 #include <sys/sysctl.h>
92
93 #include <net/if.h>
94 #include <net/if_var.h>
95 #include <net/if_types.h>
96 #include <net/if_dl.h>
97 #include <net/route.h>
98 #include <net/netisr.h>
99 #include <net/rss_config.h>
100 #include <net/pfil.h>
101 #include <net/vnet.h>
102
103 #include <netinet/in.h>
104 #include <netinet/in_kdtrace.h>
105 #include <netinet/ip_var.h>
106 #include <netinet/in_systm.h>
107 #include <net/if_llatbl.h>
108 #ifdef INET
109 #include <netinet/ip.h>
110 #include <netinet/ip_icmp.h>
111 #endif /* INET */
112 #include <netinet/ip6.h>
113 #include <netinet6/in6_var.h>
114 #include <netinet6/ip6_var.h>
115 #include <netinet/in_pcb.h>
116 #include <netinet/icmp6.h>
117 #include <netinet6/scope6_var.h>
118 #include <netinet6/in6_ifattach.h>
119 #include <netinet6/mld6_var.h>
120 #include <netinet6/nd6.h>
121 #include <netinet6/in6_rss.h>
122
123 #include <netipsec/ipsec_support.h>
124
125 #include <netinet6/ip6protosw.h>
126
127 extern struct domain inet6domain;
128
129 u_char ip6_protox[IPPROTO_MAX];
130 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
131 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
132 VNET_DEFINE(u_long, in6_ifaddrhmask);
133
134 static struct netisr_handler ip6_nh = {
135 .nh_name = "ip6",
136 .nh_handler = ip6_input,
137 .nh_proto = NETISR_IPV6,
138 #ifdef RSS
139 .nh_m2cpuid = rss_soft_m2cpuid_v6,
140 .nh_policy = NETISR_POLICY_CPU,
141 .nh_dispatch = NETISR_DISPATCH_HYBRID,
142 #else
143 .nh_policy = NETISR_POLICY_FLOW,
144 #endif
145 };
146
147 static int
148 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
149 {
150 int error, qlimit;
151
152 netisr_getqlimit(&ip6_nh, &qlimit);
153 error = sysctl_handle_int(oidp, &qlimit, 0, req);
154 if (error || !req->newptr)
155 return (error);
156 if (qlimit < 1)
157 return (EINVAL);
158 return (netisr_setqlimit(&ip6_nh, qlimit));
159 }
160 SYSCTL_DECL(_net_inet6_ip6);
161 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
162 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
163 "Maximum size of the IPv6 input queue");
164
165 #ifdef RSS
166 static struct netisr_handler ip6_direct_nh = {
167 .nh_name = "ip6_direct",
168 .nh_handler = ip6_direct_input,
169 .nh_proto = NETISR_IPV6_DIRECT,
170 .nh_m2cpuid = rss_soft_m2cpuid_v6,
171 .nh_policy = NETISR_POLICY_CPU,
172 .nh_dispatch = NETISR_DISPATCH_HYBRID,
173 };
174
175 static int
176 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
177 {
178 int error, qlimit;
179
180 netisr_getqlimit(&ip6_direct_nh, &qlimit);
181 error = sysctl_handle_int(oidp, &qlimit, 0, req);
182 if (error || !req->newptr)
183 return (error);
184 if (qlimit < 1)
185 return (EINVAL);
186 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
187 }
188 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
189 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_direct_queue_maxlen,
190 "I", "Maximum size of the IPv6 direct input queue");
191
192 #endif
193
194 VNET_DEFINE(struct pfil_head, inet6_pfil_hook);
195
196 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
197 VNET_PCPUSTAT_SYSINIT(ip6stat);
198 #ifdef VIMAGE
199 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
200 #endif /* VIMAGE */
201
202 struct rmlock in6_ifaddr_lock;
203 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
204
205 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
206
207 /*
208 * IP6 initialization: fill in IP6 protocol switch table.
209 * All protocols not implemented in kernel go to raw IP6 protocol handler.
210 */
211 void
212 ip6_init(void)
213 {
214 struct protosw *pr;
215 int i;
216
217 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
218 &V_ip6_auto_linklocal);
219 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
220 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
221
222 CK_STAILQ_INIT(&V_in6_ifaddrhead);
223 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
224 &V_in6_ifaddrhmask);
225
226 /* Initialize packet filter hooks. */
227 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
228 V_inet6_pfil_hook.ph_af = AF_INET6;
229 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0)
230 printf("%s: WARNING: unable to register pfil hook, "
231 "error %d\n", __func__, i);
232
233 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
234 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
235 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
236 printf("%s: WARNING: unable to register input helper hook\n",
237 __func__);
238 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
239 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
240 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
241 printf("%s: WARNING: unable to register output helper hook\n",
242 __func__);
243
244 scope6_init();
245 addrsel_policy_init();
246 nd6_init();
247 frag6_init();
248
249 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
250
251 /* Skip global initialization stuff for non-default instances. */
252 #ifdef VIMAGE
253 if (!IS_DEFAULT_VNET(curvnet)) {
254 netisr_register_vnet(&ip6_nh);
255 #ifdef RSS
256 netisr_register_vnet(&ip6_direct_nh);
257 #endif
258 return;
259 }
260 #endif
261
262 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
263 if (pr == NULL)
264 panic("ip6_init");
265
266 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
267 for (i = 0; i < IPPROTO_MAX; i++)
268 ip6_protox[i] = pr - inet6sw;
269 /*
270 * Cycle through IP protocols and put them into the appropriate place
271 * in ip6_protox[].
272 */
273 for (pr = inet6domain.dom_protosw;
274 pr < inet6domain.dom_protoswNPROTOSW; pr++)
275 if (pr->pr_domain->dom_family == PF_INET6 &&
276 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
277 /* Be careful to only index valid IP protocols. */
278 if (pr->pr_protocol < IPPROTO_MAX)
279 ip6_protox[pr->pr_protocol] = pr - inet6sw;
280 }
281
282 netisr_register(&ip6_nh);
283 #ifdef RSS
284 netisr_register(&ip6_direct_nh);
285 #endif
286 }
287
288 /*
289 * The protocol to be inserted into ip6_protox[] must be already registered
290 * in inet6sw[], either statically or through pf_proto_register().
291 */
292 int
293 ip6proto_register(short ip6proto)
294 {
295 struct protosw *pr;
296
297 /* Sanity checks. */
298 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
299 return (EPROTONOSUPPORT);
300
301 /*
302 * The protocol slot must not be occupied by another protocol
303 * already. An index pointing to IPPROTO_RAW is unused.
304 */
305 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
306 if (pr == NULL)
307 return (EPFNOSUPPORT);
308 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
309 return (EEXIST);
310
311 /*
312 * Find the protocol position in inet6sw[] and set the index.
313 */
314 for (pr = inet6domain.dom_protosw;
315 pr < inet6domain.dom_protoswNPROTOSW; pr++) {
316 if (pr->pr_domain->dom_family == PF_INET6 &&
317 pr->pr_protocol && pr->pr_protocol == ip6proto) {
318 ip6_protox[pr->pr_protocol] = pr - inet6sw;
319 return (0);
320 }
321 }
322 return (EPROTONOSUPPORT);
323 }
324
325 int
326 ip6proto_unregister(short ip6proto)
327 {
328 struct protosw *pr;
329
330 /* Sanity checks. */
331 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
332 return (EPROTONOSUPPORT);
333
334 /* Check if the protocol was indeed registered. */
335 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
336 if (pr == NULL)
337 return (EPFNOSUPPORT);
338 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
339 return (ENOENT);
340
341 /* Reset the protocol slot to IPPROTO_RAW. */
342 ip6_protox[ip6proto] = pr - inet6sw;
343 return (0);
344 }
345
346 #ifdef VIMAGE
347 static void
348 ip6_destroy(void *unused __unused)
349 {
350 struct ifaddr *ifa, *nifa;
351 struct ifnet *ifp;
352 int error;
353
354 #ifdef RSS
355 netisr_unregister_vnet(&ip6_direct_nh);
356 #endif
357 netisr_unregister_vnet(&ip6_nh);
358
359 if ((error = pfil_head_unregister(&V_inet6_pfil_hook)) != 0)
360 printf("%s: WARNING: unable to unregister pfil hook, "
361 "error %d\n", __func__, error);
362 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
363 if (error != 0) {
364 printf("%s: WARNING: unable to deregister input helper hook "
365 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
366 "error %d returned\n", __func__, error);
367 }
368 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
369 if (error != 0) {
370 printf("%s: WARNING: unable to deregister output helper hook "
371 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
372 "error %d returned\n", __func__, error);
373 }
374
375 /* Cleanup addresses. */
376 IFNET_RLOCK();
377 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
378 /* Cannot lock here - lock recursion. */
379 /* IF_ADDR_LOCK(ifp); */
380 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
381
382 if (ifa->ifa_addr->sa_family != AF_INET6)
383 continue;
384 in6_purgeaddr(ifa);
385 }
386 /* IF_ADDR_UNLOCK(ifp); */
387 in6_ifdetach_destroy(ifp);
388 mld_domifdetach(ifp);
389 /* Make sure any routes are gone as well. */
390 rt_flushifroutes_af(ifp, AF_INET6);
391 }
392 IFNET_RUNLOCK();
393
394 frag6_destroy();
395 nd6_destroy();
396 in6_ifattach_destroy();
397
398 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
399 }
400
401 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
402 #endif
403
404 static int
405 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off,
406 int *nxt, int *ours)
407 {
408 struct mbuf *m;
409 struct ip6_hdr *ip6;
410 struct ip6_hbh *hbh;
411
412 if (ip6_hopopts_input(plen, rtalert, mp, off)) {
413 #if 0 /*touches NULL pointer*/
414 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
415 #endif
416 goto out; /* m have already been freed */
417 }
418
419 /* adjust pointer */
420 m = *mp;
421 ip6 = mtod(m, struct ip6_hdr *);
422
423 /*
424 * if the payload length field is 0 and the next header field
425 * indicates Hop-by-Hop Options header, then a Jumbo Payload
426 * option MUST be included.
427 */
428 if (ip6->ip6_plen == 0 && *plen == 0) {
429 /*
430 * Note that if a valid jumbo payload option is
431 * contained, ip6_hopopts_input() must set a valid
432 * (non-zero) payload length to the variable plen.
433 */
434 IP6STAT_INC(ip6s_badoptions);
435 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
436 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
437 icmp6_error(m, ICMP6_PARAM_PROB,
438 ICMP6_PARAMPROB_HEADER,
439 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
440 goto out;
441 }
442 /* ip6_hopopts_input() ensures that mbuf is contiguous */
443 hbh = (struct ip6_hbh *)(ip6 + 1);
444 *nxt = hbh->ip6h_nxt;
445
446 /*
447 * If we are acting as a router and the packet contains a
448 * router alert option, see if we know the option value.
449 * Currently, we only support the option value for MLD, in which
450 * case we should pass the packet to the multicast routing
451 * daemon.
452 */
453 if (*rtalert != ~0) {
454 switch (*rtalert) {
455 case IP6OPT_RTALERT_MLD:
456 if (V_ip6_forwarding)
457 *ours = 1;
458 break;
459 default:
460 /*
461 * RFC2711 requires unrecognized values must be
462 * silently ignored.
463 */
464 break;
465 }
466 }
467
468 return (0);
469
470 out:
471 return (1);
472 }
473
474 #ifdef RSS
475 /*
476 * IPv6 direct input routine.
477 *
478 * This is called when reinjecting completed fragments where
479 * all of the previous checking and book-keeping has been done.
480 */
481 void
482 ip6_direct_input(struct mbuf *m)
483 {
484 int off, nxt;
485 int nest;
486 struct m_tag *mtag;
487 struct ip6_direct_ctx *ip6dc;
488
489 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
490 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
491
492 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
493 nxt = ip6dc->ip6dc_nxt;
494 off = ip6dc->ip6dc_off;
495
496 nest = 0;
497
498 m_tag_delete(m, mtag);
499
500 while (nxt != IPPROTO_DONE) {
501 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
502 IP6STAT_INC(ip6s_toomanyhdr);
503 goto bad;
504 }
505
506 /*
507 * protection against faulty packet - there should be
508 * more sanity checks in header chain processing.
509 */
510 if (m->m_pkthdr.len < off) {
511 IP6STAT_INC(ip6s_tooshort);
512 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
513 goto bad;
514 }
515
516 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
517 if (IPSEC_ENABLED(ipv6)) {
518 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
519 return;
520 }
521 #endif /* IPSEC */
522
523 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
524 }
525 return;
526 bad:
527 m_freem(m);
528 }
529 #endif
530
531 void
532 ip6_input(struct mbuf *m)
533 {
534 struct in6_addr odst;
535 struct ip6_hdr *ip6;
536 struct in6_ifaddr *ia;
537 struct ifnet *rcvif;
538 u_int32_t plen;
539 u_int32_t rtalert = ~0;
540 int off = sizeof(struct ip6_hdr), nest;
541 int nxt, ours = 0;
542 int srcrt = 0;
543
544 /*
545 * Drop the packet if IPv6 operation is disabled on the interface.
546 */
547 rcvif = m->m_pkthdr.rcvif;
548 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
549 goto bad;
550
551 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
552 /*
553 * should the inner packet be considered authentic?
554 * see comment in ah4_input().
555 * NB: m cannot be NULL when passed to the input routine
556 */
557
558 m->m_flags &= ~M_AUTHIPHDR;
559 m->m_flags &= ~M_AUTHIPDGM;
560
561 #endif /* IPSEC */
562
563 if (m->m_flags & M_FASTFWD_OURS) {
564 /*
565 * Firewall changed destination to local.
566 */
567 ip6 = mtod(m, struct ip6_hdr *);
568 goto passin;
569 }
570
571 /*
572 * mbuf statistics
573 */
574 if (m->m_flags & M_EXT) {
575 if (m->m_next)
576 IP6STAT_INC(ip6s_mext2m);
577 else
578 IP6STAT_INC(ip6s_mext1);
579 } else {
580 if (m->m_next) {
581 if (m->m_flags & M_LOOP) {
582 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
583 } else if (rcvif->if_index < IP6S_M2MMAX)
584 IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
585 else
586 IP6STAT_INC(ip6s_m2m[0]);
587 } else
588 IP6STAT_INC(ip6s_m1);
589 }
590
591 in6_ifstat_inc(rcvif, ifs6_in_receive);
592 IP6STAT_INC(ip6s_total);
593
594 /*
595 * L2 bridge code and some other code can return mbuf chain
596 * that does not conform to KAME requirement. too bad.
597 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
598 */
599 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
600 struct mbuf *n;
601
602 if (m->m_pkthdr.len > MHLEN)
603 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
604 else
605 n = m_gethdr(M_NOWAIT, MT_DATA);
606 if (n == NULL)
607 goto bad;
608
609 m_move_pkthdr(n, m);
610 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
611 n->m_len = n->m_pkthdr.len;
612 m_freem(m);
613 m = n;
614 }
615 if (m->m_len < sizeof(struct ip6_hdr)) {
616 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
617 IP6STAT_INC(ip6s_toosmall);
618 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
619 goto bad;
620 }
621 }
622
623 ip6 = mtod(m, struct ip6_hdr *);
624 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
625 IP6STAT_INC(ip6s_badvers);
626 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
627 goto bad;
628 }
629
630 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
631 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
632
633 /*
634 * Check against address spoofing/corruption.
635 */
636 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
637 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
638 /*
639 * XXX: "badscope" is not very suitable for a multicast source.
640 */
641 IP6STAT_INC(ip6s_badscope);
642 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
643 goto bad;
644 }
645 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
646 !(m->m_flags & M_LOOP)) {
647 /*
648 * In this case, the packet should come from the loopback
649 * interface. However, we cannot just check the if_flags,
650 * because ip6_mloopback() passes the "actual" interface
651 * as the outgoing/incoming interface.
652 */
653 IP6STAT_INC(ip6s_badscope);
654 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
655 goto bad;
656 }
657 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
658 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
659 /*
660 * RFC4291 2.7:
661 * Nodes must not originate a packet to a multicast address
662 * whose scop field contains the reserved value 0; if such
663 * a packet is received, it must be silently dropped.
664 */
665 IP6STAT_INC(ip6s_badscope);
666 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
667 goto bad;
668 }
669 #ifdef ALTQ
670 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
671 /* packet is dropped by traffic conditioner */
672 return;
673 }
674 #endif
675 /*
676 * The following check is not documented in specs. A malicious
677 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
678 * and bypass security checks (act as if it was from 127.0.0.1 by using
679 * IPv6 src ::ffff:127.0.0.1). Be cautious.
680 *
681 * We have supported IPv6-only kernels for a few years and this issue
682 * has not come up. The world seems to move mostly towards not using
683 * v4mapped on the wire, so it makes sense for us to keep rejecting
684 * any such packets.
685 */
686 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
687 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
688 IP6STAT_INC(ip6s_badscope);
689 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
690 goto bad;
691 }
692 #if 0
693 /*
694 * Reject packets with IPv4 compatible addresses (auto tunnel).
695 *
696 * The code forbids auto tunnel relay case in RFC1933 (the check is
697 * stronger than RFC1933). We may want to re-enable it if mech-xx
698 * is revised to forbid relaying case.
699 */
700 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
701 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
702 IP6STAT_INC(ip6s_badscope);
703 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
704 goto bad;
705 }
706 #endif
707 /*
708 * Try to forward the packet, but if we fail continue.
709 * ip6_tryforward() does not generate redirects, so fall
710 * through to normal processing if redirects are required.
711 * ip6_tryforward() does inbound and outbound packet firewall
712 * processing. If firewall has decided that destination becomes
713 * our local address, it sets M_FASTFWD_OURS flag. In this
714 * case skip another inbound firewall processing and update
715 * ip6 pointer.
716 */
717 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0
718 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
719 && (!IPSEC_ENABLED(ipv6) ||
720 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
721 #endif
722 ) {
723 if ((m = ip6_tryforward(m)) == NULL)
724 return;
725 if (m->m_flags & M_FASTFWD_OURS) {
726 ip6 = mtod(m, struct ip6_hdr *);
727 goto passin;
728 }
729 }
730 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
731 /*
732 * Bypass packet filtering for packets previously handled by IPsec.
733 */
734 if (IPSEC_ENABLED(ipv6) &&
735 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
736 goto passin;
737 #endif
738 /*
739 * Run through list of hooks for input packets.
740 *
741 * NB: Beware of the destination address changing
742 * (e.g. by NAT rewriting). When this happens,
743 * tell ip6_forward to do the right thing.
744 */
745
746 /* Jump over all PFIL processing if hooks are not active. */
747 if (!PFIL_HOOKED(&V_inet6_pfil_hook))
748 goto passin;
749
750 odst = ip6->ip6_dst;
751 if (pfil_run_hooks(&V_inet6_pfil_hook, &m,
752 m->m_pkthdr.rcvif, PFIL_IN, 0, NULL))
753 return;
754 if (m == NULL) /* consumed by filter */
755 return;
756 ip6 = mtod(m, struct ip6_hdr *);
757 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
758 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP &&
759 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
760 /*
761 * Directly ship the packet on. This allows forwarding
762 * packets originally destined to us to some other directly
763 * connected host.
764 */
765 ip6_forward(m, 1);
766 return;
767 }
768
769 passin:
770 /*
771 * Disambiguate address scope zones (if there is ambiguity).
772 * We first make sure that the original source or destination address
773 * is not in our internal form for scoped addresses. Such addresses
774 * are not necessarily invalid spec-wise, but we cannot accept them due
775 * to the usage conflict.
776 * in6_setscope() then also checks and rejects the cases where src or
777 * dst are the loopback address and the receiving interface
778 * is not loopback.
779 */
780 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
781 IP6STAT_INC(ip6s_badscope); /* XXX */
782 goto bad;
783 }
784 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
785 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
786 IP6STAT_INC(ip6s_badscope);
787 goto bad;
788 }
789 if (m->m_flags & M_FASTFWD_OURS) {
790 m->m_flags &= ~M_FASTFWD_OURS;
791 ours = 1;
792 goto hbhcheck;
793 }
794 /*
795 * Multicast check. Assume packet is for us to avoid
796 * prematurely taking locks.
797 */
798 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
799 ours = 1;
800 in6_ifstat_inc(rcvif, ifs6_in_mcast);
801 goto hbhcheck;
802 }
803 /*
804 * Unicast check
805 * XXX: For now we keep link-local IPv6 addresses with embedded
806 * scope zone id, therefore we use zero zoneid here.
807 */
808 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */);
809 if (ia != NULL) {
810 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
811 char ip6bufs[INET6_ADDRSTRLEN];
812 char ip6bufd[INET6_ADDRSTRLEN];
813 /* address is not ready, so discard the packet. */
814 nd6log((LOG_INFO,
815 "ip6_input: packet to an unready address %s->%s\n",
816 ip6_sprintf(ip6bufs, &ip6->ip6_src),
817 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
818 ifa_free(&ia->ia_ifa);
819 goto bad;
820 }
821 /* Count the packet in the ip address stats */
822 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
823 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
824 ifa_free(&ia->ia_ifa);
825 ours = 1;
826 goto hbhcheck;
827 }
828
829 /*
830 * Now there is no reason to process the packet if it's not our own
831 * and we're not a router.
832 */
833 if (!V_ip6_forwarding) {
834 IP6STAT_INC(ip6s_cantforward);
835 goto bad;
836 }
837
838 hbhcheck:
839 /*
840 * Process Hop-by-Hop options header if it's contained.
841 * m may be modified in ip6_hopopts_input().
842 * If a JumboPayload option is included, plen will also be modified.
843 */
844 plen = (u_int32_t)ntohs(ip6->ip6_plen);
845 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
846 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0)
847 return;
848 } else
849 nxt = ip6->ip6_nxt;
850
851 /*
852 * Use mbuf flags to propagate Router Alert option to
853 * ICMPv6 layer, as hop-by-hop options have been stripped.
854 */
855 if (rtalert != ~0)
856 m->m_flags |= M_RTALERT_MLD;
857
858 /*
859 * Check that the amount of data in the buffers
860 * is as at least much as the IPv6 header would have us expect.
861 * Trim mbufs if longer than we expect.
862 * Drop packet if shorter than we expect.
863 */
864 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
865 IP6STAT_INC(ip6s_tooshort);
866 in6_ifstat_inc(rcvif, ifs6_in_truncated);
867 goto bad;
868 }
869 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
870 if (m->m_len == m->m_pkthdr.len) {
871 m->m_len = sizeof(struct ip6_hdr) + plen;
872 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
873 } else
874 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
875 }
876
877 /*
878 * Forward if desirable.
879 */
880 if (V_ip6_mrouter &&
881 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
882 /*
883 * If we are acting as a multicast router, all
884 * incoming multicast packets are passed to the
885 * kernel-level multicast forwarding function.
886 * The packet is returned (relatively) intact; if
887 * ip6_mforward() returns a non-zero value, the packet
888 * must be discarded, else it may be accepted below.
889 *
890 * XXX TODO: Check hlim and multicast scope here to avoid
891 * unnecessarily calling into ip6_mforward().
892 */
893 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
894 IP6STAT_INC(ip6s_cantforward);
895 goto bad;
896 }
897 } else if (!ours) {
898 ip6_forward(m, srcrt);
899 return;
900 }
901
902 /*
903 * Tell launch routine the next header
904 */
905 IP6STAT_INC(ip6s_delivered);
906 in6_ifstat_inc(rcvif, ifs6_in_deliver);
907 nest = 0;
908
909 while (nxt != IPPROTO_DONE) {
910 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
911 IP6STAT_INC(ip6s_toomanyhdr);
912 goto bad;
913 }
914
915 /*
916 * protection against faulty packet - there should be
917 * more sanity checks in header chain processing.
918 */
919 if (m->m_pkthdr.len < off) {
920 IP6STAT_INC(ip6s_tooshort);
921 in6_ifstat_inc(rcvif, ifs6_in_truncated);
922 goto bad;
923 }
924
925 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
926 if (IPSEC_ENABLED(ipv6)) {
927 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
928 return;
929 }
930 #endif /* IPSEC */
931
932 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
933 }
934 return;
935 bad:
936 in6_ifstat_inc(rcvif, ifs6_in_discard);
937 if (m != NULL)
938 m_freem(m);
939 }
940
941 /*
942 * Hop-by-Hop options header processing. If a valid jumbo payload option is
943 * included, the real payload length will be stored in plenp.
944 *
945 * rtalertp - XXX: should be stored more smart way
946 */
947 static int
948 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
949 struct mbuf **mp, int *offp)
950 {
951 struct mbuf *m = *mp;
952 int off = *offp, hbhlen;
953 struct ip6_hbh *hbh;
954
955 /* validation of the length of the header */
956 if (m->m_len < off + sizeof(*hbh)) {
957 m = m_pullup(m, off + sizeof(*hbh));
958 if (m == NULL) {
959 IP6STAT_INC(ip6s_exthdrtoolong);
960 *mp = NULL;
961 return (-1);
962 }
963 }
964 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
965 hbhlen = (hbh->ip6h_len + 1) << 3;
966
967 if (m->m_len < off + hbhlen) {
968 m = m_pullup(m, off + hbhlen);
969 if (m == NULL) {
970 IP6STAT_INC(ip6s_exthdrtoolong);
971 *mp = NULL;
972 return (-1);
973 }
974 }
975 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
976 off += hbhlen;
977 hbhlen -= sizeof(struct ip6_hbh);
978 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
979 hbhlen, rtalertp, plenp) < 0) {
980 *mp = NULL;
981 return (-1);
982 }
983
984 *offp = off;
985 *mp = m;
986 return (0);
987 }
988
989 /*
990 * Search header for all Hop-by-hop options and process each option.
991 * This function is separate from ip6_hopopts_input() in order to
992 * handle a case where the sending node itself process its hop-by-hop
993 * options header. In such a case, the function is called from ip6_output().
994 *
995 * The function assumes that hbh header is located right after the IPv6 header
996 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
997 * opthead + hbhlen is located in contiguous memory region.
998 */
999 int
1000 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
1001 u_int32_t *rtalertp, u_int32_t *plenp)
1002 {
1003 struct ip6_hdr *ip6;
1004 int optlen = 0;
1005 u_int8_t *opt = opthead;
1006 u_int16_t rtalert_val;
1007 u_int32_t jumboplen;
1008 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1009
1010 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1011 switch (*opt) {
1012 case IP6OPT_PAD1:
1013 optlen = 1;
1014 break;
1015 case IP6OPT_PADN:
1016 if (hbhlen < IP6OPT_MINLEN) {
1017 IP6STAT_INC(ip6s_toosmall);
1018 goto bad;
1019 }
1020 optlen = *(opt + 1) + 2;
1021 break;
1022 case IP6OPT_ROUTER_ALERT:
1023 /* XXX may need check for alignment */
1024 if (hbhlen < IP6OPT_RTALERT_LEN) {
1025 IP6STAT_INC(ip6s_toosmall);
1026 goto bad;
1027 }
1028 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1029 /* XXX stat */
1030 icmp6_error(m, ICMP6_PARAM_PROB,
1031 ICMP6_PARAMPROB_HEADER,
1032 erroff + opt + 1 - opthead);
1033 return (-1);
1034 }
1035 optlen = IP6OPT_RTALERT_LEN;
1036 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1037 *rtalertp = ntohs(rtalert_val);
1038 break;
1039 case IP6OPT_JUMBO:
1040 /* XXX may need check for alignment */
1041 if (hbhlen < IP6OPT_JUMBO_LEN) {
1042 IP6STAT_INC(ip6s_toosmall);
1043 goto bad;
1044 }
1045 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1046 /* XXX stat */
1047 icmp6_error(m, ICMP6_PARAM_PROB,
1048 ICMP6_PARAMPROB_HEADER,
1049 erroff + opt + 1 - opthead);
1050 return (-1);
1051 }
1052 optlen = IP6OPT_JUMBO_LEN;
1053
1054 /*
1055 * IPv6 packets that have non 0 payload length
1056 * must not contain a jumbo payload option.
1057 */
1058 ip6 = mtod(m, struct ip6_hdr *);
1059 if (ip6->ip6_plen) {
1060 IP6STAT_INC(ip6s_badoptions);
1061 icmp6_error(m, ICMP6_PARAM_PROB,
1062 ICMP6_PARAMPROB_HEADER,
1063 erroff + opt - opthead);
1064 return (-1);
1065 }
1066
1067 /*
1068 * We may see jumbolen in unaligned location, so
1069 * we'd need to perform bcopy().
1070 */
1071 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1072 jumboplen = (u_int32_t)htonl(jumboplen);
1073
1074 #if 1
1075 /*
1076 * if there are multiple jumbo payload options,
1077 * *plenp will be non-zero and the packet will be
1078 * rejected.
1079 * the behavior may need some debate in ipngwg -
1080 * multiple options does not make sense, however,
1081 * there's no explicit mention in specification.
1082 */
1083 if (*plenp != 0) {
1084 IP6STAT_INC(ip6s_badoptions);
1085 icmp6_error(m, ICMP6_PARAM_PROB,
1086 ICMP6_PARAMPROB_HEADER,
1087 erroff + opt + 2 - opthead);
1088 return (-1);
1089 }
1090 #endif
1091
1092 /*
1093 * jumbo payload length must be larger than 65535.
1094 */
1095 if (jumboplen <= IPV6_MAXPACKET) {
1096 IP6STAT_INC(ip6s_badoptions);
1097 icmp6_error(m, ICMP6_PARAM_PROB,
1098 ICMP6_PARAMPROB_HEADER,
1099 erroff + opt + 2 - opthead);
1100 return (-1);
1101 }
1102 *plenp = jumboplen;
1103
1104 break;
1105 default: /* unknown option */
1106 if (hbhlen < IP6OPT_MINLEN) {
1107 IP6STAT_INC(ip6s_toosmall);
1108 goto bad;
1109 }
1110 optlen = ip6_unknown_opt(opt, m,
1111 erroff + opt - opthead);
1112 if (optlen == -1)
1113 return (-1);
1114 optlen += 2;
1115 break;
1116 }
1117 }
1118
1119 return (0);
1120
1121 bad:
1122 m_freem(m);
1123 return (-1);
1124 }
1125
1126 /*
1127 * Unknown option processing.
1128 * The third argument `off' is the offset from the IPv6 header to the option,
1129 * which is necessary if the IPv6 header the and option header and IPv6 header
1130 * is not contiguous in order to return an ICMPv6 error.
1131 */
1132 int
1133 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1134 {
1135 struct ip6_hdr *ip6;
1136
1137 switch (IP6OPT_TYPE(*optp)) {
1138 case IP6OPT_TYPE_SKIP: /* ignore the option */
1139 return ((int)*(optp + 1));
1140 case IP6OPT_TYPE_DISCARD: /* silently discard */
1141 m_freem(m);
1142 return (-1);
1143 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1144 IP6STAT_INC(ip6s_badoptions);
1145 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1146 return (-1);
1147 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1148 IP6STAT_INC(ip6s_badoptions);
1149 ip6 = mtod(m, struct ip6_hdr *);
1150 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1151 (m->m_flags & (M_BCAST|M_MCAST)))
1152 m_freem(m);
1153 else
1154 icmp6_error(m, ICMP6_PARAM_PROB,
1155 ICMP6_PARAMPROB_OPTION, off);
1156 return (-1);
1157 }
1158
1159 m_freem(m); /* XXX: NOTREACHED */
1160 return (-1);
1161 }
1162
1163 /*
1164 * Create the "control" list for this pcb.
1165 * These functions will not modify mbuf chain at all.
1166 *
1167 * The routine will be called from upper layer handlers like tcp6_input().
1168 * Thus the routine assumes that the caller (tcp6_input) have already
1169 * called m_pullup() and all the extension headers are located in the
1170 * very first mbuf on the mbuf chain.
1171 *
1172 * ip6_savecontrol_v4 will handle those options that are possible to be
1173 * set on a v4-mapped socket.
1174 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1175 * options and handle the v6-only ones itself.
1176 */
1177 struct mbuf **
1178 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1179 int *v4only)
1180 {
1181 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1182
1183 #ifdef SO_TIMESTAMP
1184 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1185 union {
1186 struct timeval tv;
1187 struct bintime bt;
1188 struct timespec ts;
1189 } t;
1190 struct bintime boottimebin, bt1;
1191 struct timespec ts1;
1192 bool stamped;
1193
1194 stamped = false;
1195 switch (inp->inp_socket->so_ts_clock) {
1196 case SO_TS_REALTIME_MICRO:
1197 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1198 M_TSTMP)) {
1199 mbuf_tstmp2timespec(m, &ts1);
1200 timespec2bintime(&ts1, &bt1);
1201 getboottimebin(&boottimebin);
1202 bintime_add(&bt1, &boottimebin);
1203 bintime2timeval(&bt1, &t.tv);
1204 } else {
1205 microtime(&t.tv);
1206 }
1207 *mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv),
1208 SCM_TIMESTAMP, SOL_SOCKET);
1209 if (*mp != NULL) {
1210 mp = &(*mp)->m_next;
1211 stamped = true;
1212 }
1213 break;
1214
1215 case SO_TS_BINTIME:
1216 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1217 M_TSTMP)) {
1218 mbuf_tstmp2timespec(m, &ts1);
1219 timespec2bintime(&ts1, &t.bt);
1220 getboottimebin(&boottimebin);
1221 bintime_add(&t.bt, &boottimebin);
1222 } else {
1223 bintime(&t.bt);
1224 }
1225 *mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt),
1226 SCM_BINTIME, SOL_SOCKET);
1227 if (*mp != NULL) {
1228 mp = &(*mp)->m_next;
1229 stamped = true;
1230 }
1231 break;
1232
1233 case SO_TS_REALTIME:
1234 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1235 M_TSTMP)) {
1236 mbuf_tstmp2timespec(m, &t.ts);
1237 getboottimebin(&boottimebin);
1238 bintime2timespec(&boottimebin, &ts1);
1239 timespecadd(&t.ts, &ts1, &t.ts);
1240 } else {
1241 nanotime(&t.ts);
1242 }
1243 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1244 SCM_REALTIME, SOL_SOCKET);
1245 if (*mp != NULL) {
1246 mp = &(*mp)->m_next;
1247 stamped = true;
1248 }
1249 break;
1250
1251 case SO_TS_MONOTONIC:
1252 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1253 M_TSTMP))
1254 mbuf_tstmp2timespec(m, &t.ts);
1255 else
1256 nanouptime(&t.ts);
1257 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1258 SCM_MONOTONIC, SOL_SOCKET);
1259 if (*mp != NULL) {
1260 mp = &(*mp)->m_next;
1261 stamped = true;
1262 }
1263 break;
1264
1265 default:
1266 panic("unknown (corrupted) so_ts_clock");
1267 }
1268 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) ==
1269 (M_PKTHDR | M_TSTMP)) {
1270 struct sock_timestamp_info sti;
1271
1272 bzero(&sti, sizeof(sti));
1273 sti.st_info_flags = ST_INFO_HW;
1274 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1275 sti.st_info_flags |= ST_INFO_HW_HPREC;
1276 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti),
1277 SCM_TIME_INFO, SOL_SOCKET);
1278 if (*mp != NULL)
1279 mp = &(*mp)->m_next;
1280 }
1281 }
1282 #endif
1283
1284 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1285 /* RFC 2292 sec. 5 */
1286 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1287 struct in6_pktinfo pi6;
1288
1289 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1290 #ifdef INET
1291 struct ip *ip;
1292
1293 ip = mtod(m, struct ip *);
1294 pi6.ipi6_addr.s6_addr32[0] = 0;
1295 pi6.ipi6_addr.s6_addr32[1] = 0;
1296 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1297 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1298 #else
1299 /* We won't hit this code */
1300 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1301 #endif
1302 } else {
1303 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1304 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1305 }
1306 pi6.ipi6_ifindex =
1307 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1308
1309 *mp = sbcreatecontrol((caddr_t) &pi6,
1310 sizeof(struct in6_pktinfo),
1311 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1312 if (*mp)
1313 mp = &(*mp)->m_next;
1314 }
1315
1316 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1317 int hlim;
1318
1319 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1320 #ifdef INET
1321 struct ip *ip;
1322
1323 ip = mtod(m, struct ip *);
1324 hlim = ip->ip_ttl;
1325 #else
1326 /* We won't hit this code */
1327 hlim = 0;
1328 #endif
1329 } else {
1330 hlim = ip6->ip6_hlim & 0xff;
1331 }
1332 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1333 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1334 IPPROTO_IPV6);
1335 if (*mp)
1336 mp = &(*mp)->m_next;
1337 }
1338
1339 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1340 int tclass;
1341
1342 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1343 #ifdef INET
1344 struct ip *ip;
1345
1346 ip = mtod(m, struct ip *);
1347 tclass = ip->ip_tos;
1348 #else
1349 /* We won't hit this code */
1350 tclass = 0;
1351 #endif
1352 } else {
1353 u_int32_t flowinfo;
1354
1355 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1356 flowinfo >>= 20;
1357 tclass = flowinfo & 0xff;
1358 }
1359 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1360 IPV6_TCLASS, IPPROTO_IPV6);
1361 if (*mp)
1362 mp = &(*mp)->m_next;
1363 }
1364
1365 if (v4only != NULL) {
1366 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1367 *v4only = 1;
1368 } else {
1369 *v4only = 0;
1370 }
1371 }
1372
1373 return (mp);
1374 }
1375
1376 void
1377 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp)
1378 {
1379 struct ip6_hdr *ip6;
1380 int v4only = 0;
1381
1382 mp = ip6_savecontrol_v4(inp, m, mp, &v4only);
1383 if (v4only)
1384 return;
1385
1386 ip6 = mtod(m, struct ip6_hdr *);
1387 /*
1388 * IPV6_HOPOPTS socket option. Recall that we required super-user
1389 * privilege for the option (see ip6_ctloutput), but it might be too
1390 * strict, since there might be some hop-by-hop options which can be
1391 * returned to normal user.
1392 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1393 */
1394 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
1395 /*
1396 * Check if a hop-by-hop options header is contatined in the
1397 * received packet, and if so, store the options as ancillary
1398 * data. Note that a hop-by-hop options header must be
1399 * just after the IPv6 header, which is assured through the
1400 * IPv6 input processing.
1401 */
1402 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1403 struct ip6_hbh *hbh;
1404 int hbhlen;
1405
1406 hbh = (struct ip6_hbh *)(ip6 + 1);
1407 hbhlen = (hbh->ip6h_len + 1) << 3;
1408
1409 /*
1410 * XXX: We copy the whole header even if a
1411 * jumbo payload option is included, the option which
1412 * is to be removed before returning according to
1413 * RFC2292.
1414 * Note: this constraint is removed in RFC3542
1415 */
1416 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1417 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1418 IPPROTO_IPV6);
1419 if (*mp)
1420 mp = &(*mp)->m_next;
1421 }
1422 }
1423
1424 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1425 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1426
1427 /*
1428 * Search for destination options headers or routing
1429 * header(s) through the header chain, and stores each
1430 * header as ancillary data.
1431 * Note that the order of the headers remains in
1432 * the chain of ancillary data.
1433 */
1434 while (1) { /* is explicit loop prevention necessary? */
1435 struct ip6_ext *ip6e = NULL;
1436 int elen;
1437
1438 /*
1439 * if it is not an extension header, don't try to
1440 * pull it from the chain.
1441 */
1442 switch (nxt) {
1443 case IPPROTO_DSTOPTS:
1444 case IPPROTO_ROUTING:
1445 case IPPROTO_HOPOPTS:
1446 case IPPROTO_AH: /* is it possible? */
1447 break;
1448 default:
1449 goto loopend;
1450 }
1451
1452 if (off + sizeof(*ip6e) > m->m_len)
1453 goto loopend;
1454 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1455 if (nxt == IPPROTO_AH)
1456 elen = (ip6e->ip6e_len + 2) << 2;
1457 else
1458 elen = (ip6e->ip6e_len + 1) << 3;
1459 if (off + elen > m->m_len)
1460 goto loopend;
1461
1462 switch (nxt) {
1463 case IPPROTO_DSTOPTS:
1464 if (!(inp->inp_flags & IN6P_DSTOPTS))
1465 break;
1466
1467 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1468 IS2292(inp,
1469 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1470 IPPROTO_IPV6);
1471 if (*mp)
1472 mp = &(*mp)->m_next;
1473 break;
1474 case IPPROTO_ROUTING:
1475 if (!(inp->inp_flags & IN6P_RTHDR))
1476 break;
1477
1478 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1479 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR),
1480 IPPROTO_IPV6);
1481 if (*mp)
1482 mp = &(*mp)->m_next;
1483 break;
1484 case IPPROTO_HOPOPTS:
1485 case IPPROTO_AH: /* is it possible? */
1486 break;
1487
1488 default:
1489 /*
1490 * other cases have been filtered in the above.
1491 * none will visit this case. here we supply
1492 * the code just in case (nxt overwritten or
1493 * other cases).
1494 */
1495 goto loopend;
1496
1497 }
1498
1499 /* proceed with the next header. */
1500 off += elen;
1501 nxt = ip6e->ip6e_nxt;
1502 ip6e = NULL;
1503 }
1504 loopend:
1505 ;
1506 }
1507
1508 if (inp->inp_flags2 & INP_RECVFLOWID) {
1509 uint32_t flowid, flow_type;
1510
1511 flowid = m->m_pkthdr.flowid;
1512 flow_type = M_HASHTYPE_GET(m);
1513
1514 /*
1515 * XXX should handle the failure of one or the
1516 * other - don't populate both?
1517 */
1518 *mp = sbcreatecontrol((caddr_t) &flowid,
1519 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6);
1520 if (*mp)
1521 mp = &(*mp)->m_next;
1522 *mp = sbcreatecontrol((caddr_t) &flow_type,
1523 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6);
1524 if (*mp)
1525 mp = &(*mp)->m_next;
1526 }
1527
1528 #ifdef RSS
1529 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1530 uint32_t flowid, flow_type;
1531 uint32_t rss_bucketid;
1532
1533 flowid = m->m_pkthdr.flowid;
1534 flow_type = M_HASHTYPE_GET(m);
1535
1536 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1537 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1538 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6);
1539 if (*mp)
1540 mp = &(*mp)->m_next;
1541 }
1542 }
1543 #endif
1544
1545 }
1546 #undef IS2292
1547
1548 void
1549 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1550 {
1551 struct socket *so;
1552 struct mbuf *m_mtu;
1553 struct ip6_mtuinfo mtuctl;
1554
1555 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1556 /*
1557 * Notify the error by sending IPV6_PATHMTU ancillary data if
1558 * application wanted to know the MTU value.
1559 * NOTE: we notify disconnected sockets, because some udp
1560 * applications keep sending sockets disconnected.
1561 * NOTE: our implementation doesn't notify connected sockets that has
1562 * foreign address that is different than given destination addresses
1563 * (this is permitted by RFC 3542).
1564 */
1565 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1566 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1567 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1568 return;
1569
1570 mtuctl.ip6m_mtu = mtu;
1571 mtuctl.ip6m_addr = *dst;
1572 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1573 return;
1574
1575 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1576 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1577 return;
1578
1579 so = inp->inp_socket;
1580 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1581 == 0) {
1582 soroverflow(so);
1583 m_freem(m_mtu);
1584 /* XXX: should count statistics */
1585 } else
1586 sorwakeup(so);
1587 }
1588
1589 /*
1590 * Get pointer to the previous header followed by the header
1591 * currently processed.
1592 */
1593 int
1594 ip6_get_prevhdr(const struct mbuf *m, int off)
1595 {
1596 struct ip6_ext ip6e;
1597 struct ip6_hdr *ip6;
1598 int len, nlen, nxt;
1599
1600 if (off == sizeof(struct ip6_hdr))
1601 return (offsetof(struct ip6_hdr, ip6_nxt));
1602 if (off < sizeof(struct ip6_hdr))
1603 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1604
1605 ip6 = mtod(m, struct ip6_hdr *);
1606 nxt = ip6->ip6_nxt;
1607 len = sizeof(struct ip6_hdr);
1608 nlen = 0;
1609 while (len < off) {
1610 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e);
1611 switch (nxt) {
1612 case IPPROTO_FRAGMENT:
1613 nlen = sizeof(struct ip6_frag);
1614 break;
1615 case IPPROTO_AH:
1616 nlen = (ip6e.ip6e_len + 2) << 2;
1617 break;
1618 default:
1619 nlen = (ip6e.ip6e_len + 1) << 3;
1620 }
1621 len += nlen;
1622 nxt = ip6e.ip6e_nxt;
1623 }
1624 return (len - nlen);
1625 }
1626
1627 /*
1628 * get next header offset. m will be retained.
1629 */
1630 int
1631 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1632 {
1633 struct ip6_hdr ip6;
1634 struct ip6_ext ip6e;
1635 struct ip6_frag fh;
1636
1637 /* just in case */
1638 if (m == NULL)
1639 panic("ip6_nexthdr: m == NULL");
1640 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1641 return -1;
1642
1643 switch (proto) {
1644 case IPPROTO_IPV6:
1645 if (m->m_pkthdr.len < off + sizeof(ip6))
1646 return -1;
1647 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1648 if (nxtp)
1649 *nxtp = ip6.ip6_nxt;
1650 off += sizeof(ip6);
1651 return off;
1652
1653 case IPPROTO_FRAGMENT:
1654 /*
1655 * terminate parsing if it is not the first fragment,
1656 * it does not make sense to parse through it.
1657 */
1658 if (m->m_pkthdr.len < off + sizeof(fh))
1659 return -1;
1660 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1661 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1662 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1663 return -1;
1664 if (nxtp)
1665 *nxtp = fh.ip6f_nxt;
1666 off += sizeof(struct ip6_frag);
1667 return off;
1668
1669 case IPPROTO_AH:
1670 if (m->m_pkthdr.len < off + sizeof(ip6e))
1671 return -1;
1672 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1673 if (nxtp)
1674 *nxtp = ip6e.ip6e_nxt;
1675 off += (ip6e.ip6e_len + 2) << 2;
1676 return off;
1677
1678 case IPPROTO_HOPOPTS:
1679 case IPPROTO_ROUTING:
1680 case IPPROTO_DSTOPTS:
1681 if (m->m_pkthdr.len < off + sizeof(ip6e))
1682 return -1;
1683 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1684 if (nxtp)
1685 *nxtp = ip6e.ip6e_nxt;
1686 off += (ip6e.ip6e_len + 1) << 3;
1687 return off;
1688
1689 case IPPROTO_NONE:
1690 case IPPROTO_ESP:
1691 case IPPROTO_IPCOMP:
1692 /* give up */
1693 return -1;
1694
1695 default:
1696 return -1;
1697 }
1698
1699 /* NOTREACHED */
1700 }
1701
1702 /*
1703 * get offset for the last header in the chain. m will be kept untainted.
1704 */
1705 int
1706 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1707 {
1708 int newoff;
1709 int nxt;
1710
1711 if (!nxtp) {
1712 nxt = -1;
1713 nxtp = &nxt;
1714 }
1715 while (1) {
1716 newoff = ip6_nexthdr(m, off, proto, nxtp);
1717 if (newoff < 0)
1718 return off;
1719 else if (newoff < off)
1720 return -1; /* invalid */
1721 else if (newoff == off)
1722 return newoff;
1723
1724 off = newoff;
1725 proto = *nxtp;
1726 }
1727 }
1728
1729 /*
1730 * System control for IP6
1731 */
1732
1733 u_char inet6ctlerrmap[PRC_NCMDS] = {
1734 0, 0, 0, 0,
1735 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1736 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1737 EMSGSIZE, EHOSTUNREACH, 0, 0,
1738 0, 0, EHOSTUNREACH, 0,
1739 ENOPROTOOPT, ECONNREFUSED
1740 };
Cache object: 07f85bfd3985124075245c715e808503
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