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
sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)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 | CTLFLAG_MPSAFE,
163 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
164 "Maximum size of the IPv6 input queue");
165
166 #ifdef RSS
167 static struct netisr_handler ip6_direct_nh = {
168 .nh_name = "ip6_direct",
169 .nh_handler = ip6_direct_input,
170 .nh_proto = NETISR_IPV6_DIRECT,
171 .nh_m2cpuid = rss_soft_m2cpuid_v6,
172 .nh_policy = NETISR_POLICY_CPU,
173 .nh_dispatch = NETISR_DISPATCH_HYBRID,
174 };
175
176 static int
sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)177 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
178 {
179 int error, qlimit;
180
181 netisr_getqlimit(&ip6_direct_nh, &qlimit);
182 error = sysctl_handle_int(oidp, &qlimit, 0, req);
183 if (error || !req->newptr)
184 return (error);
185 if (qlimit < 1)
186 return (EINVAL);
187 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
188 }
189 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
190 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
191 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I",
192 "Maximum size of the IPv6 direct input queue");
193
194 #endif
195
196 VNET_DEFINE(pfil_head_t, inet6_pfil_head);
197
198 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
199 VNET_PCPUSTAT_SYSINIT(ip6stat);
200 #ifdef VIMAGE
201 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
202 #endif /* VIMAGE */
203
204 struct rmlock in6_ifaddr_lock;
205 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
206
207 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
208
209 /*
210 * IP6 initialization: fill in IP6 protocol switch table.
211 * All protocols not implemented in kernel go to raw IP6 protocol handler.
212 */
213 void
ip6_init(void)214 ip6_init(void)
215 {
216 struct pfil_head_args args;
217 struct protosw *pr;
218 int i;
219
220 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
221 &V_ip6_auto_linklocal);
222 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
223 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
224
225 CK_STAILQ_INIT(&V_in6_ifaddrhead);
226 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
227 &V_in6_ifaddrhmask);
228
229 /* Initialize packet filter hooks. */
230 args.pa_version = PFIL_VERSION;
231 args.pa_flags = PFIL_IN | PFIL_OUT;
232 args.pa_type = PFIL_TYPE_IP6;
233 args.pa_headname = PFIL_INET6_NAME;
234 V_inet6_pfil_head = pfil_head_register(&args);
235
236 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
237 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
238 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
239 printf("%s: WARNING: unable to register input helper hook\n",
240 __func__);
241 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
242 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
243 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
244 printf("%s: WARNING: unable to register output helper hook\n",
245 __func__);
246
247 scope6_init();
248 addrsel_policy_init();
249 nd6_init();
250 frag6_init();
251
252 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
253
254 /* Skip global initialization stuff for non-default instances. */
255 #ifdef VIMAGE
256 if (!IS_DEFAULT_VNET(curvnet)) {
257 netisr_register_vnet(&ip6_nh);
258 #ifdef RSS
259 netisr_register_vnet(&ip6_direct_nh);
260 #endif
261 return;
262 }
263 #endif
264
265 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
266 if (pr == NULL)
267 panic("ip6_init");
268
269 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */
270 for (i = 0; i < IPPROTO_MAX; i++)
271 ip6_protox[i] = pr - inet6sw;
272 /*
273 * Cycle through IP protocols and put them into the appropriate place
274 * in ip6_protox[].
275 */
276 for (pr = inet6domain.dom_protosw;
277 pr < inet6domain.dom_protoswNPROTOSW; pr++)
278 if (pr->pr_domain->dom_family == PF_INET6 &&
279 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
280 /* Be careful to only index valid IP protocols. */
281 if (pr->pr_protocol < IPPROTO_MAX)
282 ip6_protox[pr->pr_protocol] = pr - inet6sw;
283 }
284
285 netisr_register(&ip6_nh);
286 #ifdef RSS
287 netisr_register(&ip6_direct_nh);
288 #endif
289 }
290
291 /*
292 * The protocol to be inserted into ip6_protox[] must be already registered
293 * in inet6sw[], either statically or through pf_proto_register().
294 */
295 int
ip6proto_register(short ip6proto)296 ip6proto_register(short ip6proto)
297 {
298 struct protosw *pr;
299
300 /* Sanity checks. */
301 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
302 return (EPROTONOSUPPORT);
303
304 /*
305 * The protocol slot must not be occupied by another protocol
306 * already. An index pointing to IPPROTO_RAW is unused.
307 */
308 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
309 if (pr == NULL)
310 return (EPFNOSUPPORT);
311 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */
312 return (EEXIST);
313
314 /*
315 * Find the protocol position in inet6sw[] and set the index.
316 */
317 for (pr = inet6domain.dom_protosw;
318 pr < inet6domain.dom_protoswNPROTOSW; pr++) {
319 if (pr->pr_domain->dom_family == PF_INET6 &&
320 pr->pr_protocol && pr->pr_protocol == ip6proto) {
321 ip6_protox[pr->pr_protocol] = pr - inet6sw;
322 return (0);
323 }
324 }
325 return (EPROTONOSUPPORT);
326 }
327
328 int
ip6proto_unregister(short ip6proto)329 ip6proto_unregister(short ip6proto)
330 {
331 struct protosw *pr;
332
333 /* Sanity checks. */
334 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX)
335 return (EPROTONOSUPPORT);
336
337 /* Check if the protocol was indeed registered. */
338 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
339 if (pr == NULL)
340 return (EPFNOSUPPORT);
341 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */
342 return (ENOENT);
343
344 /* Reset the protocol slot to IPPROTO_RAW. */
345 ip6_protox[ip6proto] = pr - inet6sw;
346 return (0);
347 }
348
349 #ifdef VIMAGE
350 static void
ip6_destroy(void * unused __unused)351 ip6_destroy(void *unused __unused)
352 {
353 struct ifaddr *ifa, *nifa;
354 struct ifnet *ifp;
355 int error;
356
357 #ifdef RSS
358 netisr_unregister_vnet(&ip6_direct_nh);
359 #endif
360 netisr_unregister_vnet(&ip6_nh);
361
362 pfil_head_unregister(V_inet6_pfil_head);
363 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
364 if (error != 0) {
365 printf("%s: WARNING: unable to deregister input helper hook "
366 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
367 "error %d returned\n", __func__, error);
368 }
369 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
370 if (error != 0) {
371 printf("%s: WARNING: unable to deregister output helper hook "
372 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
373 "error %d returned\n", __func__, error);
374 }
375
376 /* Cleanup addresses. */
377 IFNET_RLOCK();
378 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
379 /* Cannot lock here - lock recursion. */
380 /* IF_ADDR_LOCK(ifp); */
381 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
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 }
390 IFNET_RUNLOCK();
391
392 /* Make sure any routes are gone as well. */
393 rib_flush_routes_family(AF_INET6);
394
395 frag6_destroy();
396 nd6_destroy();
397 in6_ifattach_destroy();
398
399 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
400 }
401
402 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
403 #endif
404
405 static int
ip6_input_hbh(struct mbuf ** mp,uint32_t * plen,uint32_t * rtalert,int * off,int * nxt,int * ours)406 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off,
407 int *nxt, int *ours)
408 {
409 struct mbuf *m;
410 struct ip6_hdr *ip6;
411 struct ip6_hbh *hbh;
412
413 if (ip6_hopopts_input(plen, rtalert, mp, off)) {
414 #if 0 /*touches NULL pointer*/
415 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
416 #endif
417 goto out; /* m have already been freed */
418 }
419
420 /* adjust pointer */
421 m = *mp;
422 ip6 = mtod(m, struct ip6_hdr *);
423
424 /*
425 * if the payload length field is 0 and the next header field
426 * indicates Hop-by-Hop Options header, then a Jumbo Payload
427 * option MUST be included.
428 */
429 if (ip6->ip6_plen == 0 && *plen == 0) {
430 /*
431 * Note that if a valid jumbo payload option is
432 * contained, ip6_hopopts_input() must set a valid
433 * (non-zero) payload length to the variable plen.
434 */
435 IP6STAT_INC(ip6s_badoptions);
436 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
437 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
438 icmp6_error(m, ICMP6_PARAM_PROB,
439 ICMP6_PARAMPROB_HEADER,
440 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
441 goto out;
442 }
443 /* ip6_hopopts_input() ensures that mbuf is contiguous */
444 hbh = (struct ip6_hbh *)(ip6 + 1);
445 *nxt = hbh->ip6h_nxt;
446
447 /*
448 * If we are acting as a router and the packet contains a
449 * router alert option, see if we know the option value.
450 * Currently, we only support the option value for MLD, in which
451 * case we should pass the packet to the multicast routing
452 * daemon.
453 */
454 if (*rtalert != ~0) {
455 switch (*rtalert) {
456 case IP6OPT_RTALERT_MLD:
457 if (V_ip6_forwarding)
458 *ours = 1;
459 break;
460 default:
461 /*
462 * RFC2711 requires unrecognized values must be
463 * silently ignored.
464 */
465 break;
466 }
467 }
468
469 return (0);
470
471 out:
472 return (1);
473 }
474
475 #ifdef RSS
476 /*
477 * IPv6 direct input routine.
478 *
479 * This is called when reinjecting completed fragments where
480 * all of the previous checking and book-keeping has been done.
481 */
482 void
ip6_direct_input(struct mbuf * m)483 ip6_direct_input(struct mbuf *m)
484 {
485 int off, nxt;
486 int nest;
487 struct m_tag *mtag;
488 struct ip6_direct_ctx *ip6dc;
489
490 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
491 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
492
493 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
494 nxt = ip6dc->ip6dc_nxt;
495 off = ip6dc->ip6dc_off;
496
497 nest = 0;
498
499 m_tag_delete(m, mtag);
500
501 while (nxt != IPPROTO_DONE) {
502 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
503 IP6STAT_INC(ip6s_toomanyhdr);
504 goto bad;
505 }
506
507 /*
508 * protection against faulty packet - there should be
509 * more sanity checks in header chain processing.
510 */
511 if (m->m_pkthdr.len < off) {
512 IP6STAT_INC(ip6s_tooshort);
513 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
514 goto bad;
515 }
516
517 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
518 if (IPSEC_ENABLED(ipv6)) {
519 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
520 return;
521 }
522 #endif /* IPSEC */
523
524 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
525 }
526 return;
527 bad:
528 m_freem(m);
529 }
530 #endif
531
532 void
ip6_input(struct mbuf * m)533 ip6_input(struct mbuf *m)
534 {
535 struct in6_addr odst;
536 struct ip6_hdr *ip6;
537 struct in6_ifaddr *ia;
538 struct ifnet *rcvif;
539 u_int32_t plen;
540 u_int32_t rtalert = ~0;
541 int off = sizeof(struct ip6_hdr), nest;
542 int nxt, ours = 0;
543 int srcrt = 0;
544
545 /*
546 * Drop the packet if IPv6 operation is disabled on the interface.
547 */
548 rcvif = m->m_pkthdr.rcvif;
549 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED))
550 goto bad;
551
552 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
553 /*
554 * should the inner packet be considered authentic?
555 * see comment in ah4_input().
556 * NB: m cannot be NULL when passed to the input routine
557 */
558
559 m->m_flags &= ~M_AUTHIPHDR;
560 m->m_flags &= ~M_AUTHIPDGM;
561
562 #endif /* IPSEC */
563
564 if (m->m_flags & M_FASTFWD_OURS) {
565 /*
566 * Firewall changed destination to local.
567 */
568 ip6 = mtod(m, struct ip6_hdr *);
569 goto passin;
570 }
571
572 /*
573 * mbuf statistics
574 */
575 if (m->m_flags & M_EXT) {
576 if (m->m_next)
577 IP6STAT_INC(ip6s_mext2m);
578 else
579 IP6STAT_INC(ip6s_mext1);
580 } else {
581 if (m->m_next) {
582 if (m->m_flags & M_LOOP) {
583 IP6STAT_INC(ip6s_m2m[V_loif->if_index]);
584 } else if (rcvif->if_index < IP6S_M2MMAX)
585 IP6STAT_INC(ip6s_m2m[rcvif->if_index]);
586 else
587 IP6STAT_INC(ip6s_m2m[0]);
588 } else
589 IP6STAT_INC(ip6s_m1);
590 }
591
592 in6_ifstat_inc(rcvif, ifs6_in_receive);
593 IP6STAT_INC(ip6s_total);
594
595 /*
596 * L2 bridge code and some other code can return mbuf chain
597 * that does not conform to KAME requirement. too bad.
598 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
599 */
600 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
601 struct mbuf *n;
602
603 if (m->m_pkthdr.len > MHLEN)
604 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
605 else
606 n = m_gethdr(M_NOWAIT, MT_DATA);
607 if (n == NULL)
608 goto bad;
609
610 m_move_pkthdr(n, m);
611 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
612 n->m_len = n->m_pkthdr.len;
613 m_freem(m);
614 m = n;
615 }
616 if (m->m_len < sizeof(struct ip6_hdr)) {
617 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
618 IP6STAT_INC(ip6s_toosmall);
619 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
620 goto bad;
621 }
622 }
623
624 ip6 = mtod(m, struct ip6_hdr *);
625 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
626 IP6STAT_INC(ip6s_badvers);
627 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
628 goto bad;
629 }
630
631 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]);
632 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
633
634 /*
635 * Check against address spoofing/corruption.
636 */
637 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
638 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
639 /*
640 * XXX: "badscope" is not very suitable for a multicast source.
641 */
642 IP6STAT_INC(ip6s_badscope);
643 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
644 goto bad;
645 }
646 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
647 !(m->m_flags & M_LOOP)) {
648 /*
649 * In this case, the packet should come from the loopback
650 * interface. However, we cannot just check the if_flags,
651 * because ip6_mloopback() passes the "actual" interface
652 * as the outgoing/incoming interface.
653 */
654 IP6STAT_INC(ip6s_badscope);
655 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
656 goto bad;
657 }
658 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
659 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
660 /*
661 * RFC4291 2.7:
662 * Nodes must not originate a packet to a multicast address
663 * whose scop field contains the reserved value 0; if such
664 * a packet is received, it must be silently dropped.
665 */
666 IP6STAT_INC(ip6s_badscope);
667 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
668 goto bad;
669 }
670 #ifdef ALTQ
671 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
672 /* packet is dropped by traffic conditioner */
673 return;
674 }
675 #endif
676 /*
677 * The following check is not documented in specs. A malicious
678 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
679 * and bypass security checks (act as if it was from 127.0.0.1 by using
680 * IPv6 src ::ffff:127.0.0.1). Be cautious.
681 *
682 * We have supported IPv6-only kernels for a few years and this issue
683 * has not come up. The world seems to move mostly towards not using
684 * v4mapped on the wire, so it makes sense for us to keep rejecting
685 * any such packets.
686 */
687 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
688 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
689 IP6STAT_INC(ip6s_badscope);
690 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
691 goto bad;
692 }
693 #if 0
694 /*
695 * Reject packets with IPv4 compatible addresses (auto tunnel).
696 *
697 * The code forbids auto tunnel relay case in RFC1933 (the check is
698 * stronger than RFC1933). We may want to re-enable it if mech-xx
699 * is revised to forbid relaying case.
700 */
701 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
702 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
703 IP6STAT_INC(ip6s_badscope);
704 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
705 goto bad;
706 }
707 #endif
708 /*
709 * Try to forward the packet, but if we fail continue.
710 * ip6_tryforward() does not generate redirects, so fall
711 * through to normal processing if redirects are required.
712 * ip6_tryforward() does inbound and outbound packet firewall
713 * processing. If firewall has decided that destination becomes
714 * our local address, it sets M_FASTFWD_OURS flag. In this
715 * case skip another inbound firewall processing and update
716 * ip6 pointer.
717 */
718 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0
719 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
720 && (!IPSEC_ENABLED(ipv6) ||
721 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
722 #endif
723 ) {
724 if ((m = ip6_tryforward(m)) == NULL)
725 return;
726 if (m->m_flags & M_FASTFWD_OURS) {
727 ip6 = mtod(m, struct ip6_hdr *);
728 goto passin;
729 }
730 }
731 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
732 /*
733 * Bypass packet filtering for packets previously handled by IPsec.
734 */
735 if (IPSEC_ENABLED(ipv6) &&
736 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
737 goto passin;
738 #endif
739 /*
740 * Run through list of hooks for input packets.
741 *
742 * NB: Beware of the destination address changing
743 * (e.g. by NAT rewriting). When this happens,
744 * tell ip6_forward to do the right thing.
745 */
746
747 /* Jump over all PFIL processing if hooks are not active. */
748 if (!PFIL_HOOKED_IN(V_inet6_pfil_head))
749 goto passin;
750
751 odst = ip6->ip6_dst;
752 if (pfil_run_hooks(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, PFIL_IN,
753 NULL) != PFIL_PASS)
754 return;
755 ip6 = mtod(m, struct ip6_hdr *);
756 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
757 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP &&
758 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
759 /*
760 * Directly ship the packet on. This allows forwarding
761 * packets originally destined to us to some other directly
762 * connected host.
763 */
764 ip6_forward(m, 1);
765 return;
766 }
767
768 passin:
769 /*
770 * Disambiguate address scope zones (if there is ambiguity).
771 * We first make sure that the original source or destination address
772 * is not in our internal form for scoped addresses. Such addresses
773 * are not necessarily invalid spec-wise, but we cannot accept them due
774 * to the usage conflict.
775 * in6_setscope() then also checks and rejects the cases where src or
776 * dst are the loopback address and the receiving interface
777 * is not loopback.
778 */
779 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
780 IP6STAT_INC(ip6s_badscope); /* XXX */
781 goto bad;
782 }
783 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
784 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
785 IP6STAT_INC(ip6s_badscope);
786 goto bad;
787 }
788 if (m->m_flags & M_FASTFWD_OURS) {
789 m->m_flags &= ~M_FASTFWD_OURS;
790 ours = 1;
791 goto hbhcheck;
792 }
793 /*
794 * Multicast check. Assume packet is for us to avoid
795 * prematurely taking locks.
796 */
797 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
798 ours = 1;
799 in6_ifstat_inc(rcvif, ifs6_in_mcast);
800 goto hbhcheck;
801 }
802 /*
803 * Unicast check
804 * XXX: For now we keep link-local IPv6 addresses with embedded
805 * scope zone id, therefore we use zero zoneid here.
806 */
807 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
808 if (ia != NULL) {
809 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
810 char ip6bufs[INET6_ADDRSTRLEN];
811 char ip6bufd[INET6_ADDRSTRLEN];
812 /* address is not ready, so discard the packet. */
813 nd6log((LOG_INFO,
814 "ip6_input: packet to an unready address %s->%s\n",
815 ip6_sprintf(ip6bufs, &ip6->ip6_src),
816 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
817 goto bad;
818 }
819 /* Count the packet in the ip address stats */
820 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
821 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
822 ours = 1;
823 goto hbhcheck;
824 }
825
826 /*
827 * Now there is no reason to process the packet if it's not our own
828 * and we're not a router.
829 */
830 if (!V_ip6_forwarding) {
831 IP6STAT_INC(ip6s_cantforward);
832 goto bad;
833 }
834
835 hbhcheck:
836 /*
837 * Process Hop-by-Hop options header if it's contained.
838 * m may be modified in ip6_hopopts_input().
839 * If a JumboPayload option is included, plen will also be modified.
840 */
841 plen = (u_int32_t)ntohs(ip6->ip6_plen);
842 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
843 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0)
844 return;
845 } else
846 nxt = ip6->ip6_nxt;
847
848 /*
849 * Use mbuf flags to propagate Router Alert option to
850 * ICMPv6 layer, as hop-by-hop options have been stripped.
851 */
852 if (rtalert != ~0)
853 m->m_flags |= M_RTALERT_MLD;
854
855 /*
856 * Check that the amount of data in the buffers
857 * is as at least much as the IPv6 header would have us expect.
858 * Trim mbufs if longer than we expect.
859 * Drop packet if shorter than we expect.
860 */
861 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
862 IP6STAT_INC(ip6s_tooshort);
863 in6_ifstat_inc(rcvif, ifs6_in_truncated);
864 goto bad;
865 }
866 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
867 if (m->m_len == m->m_pkthdr.len) {
868 m->m_len = sizeof(struct ip6_hdr) + plen;
869 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
870 } else
871 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
872 }
873
874 /*
875 * Forward if desirable.
876 */
877 if (V_ip6_mrouter &&
878 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
879 /*
880 * If we are acting as a multicast router, all
881 * incoming multicast packets are passed to the
882 * kernel-level multicast forwarding function.
883 * The packet is returned (relatively) intact; if
884 * ip6_mforward() returns a non-zero value, the packet
885 * must be discarded, else it may be accepted below.
886 *
887 * XXX TODO: Check hlim and multicast scope here to avoid
888 * unnecessarily calling into ip6_mforward().
889 */
890 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
891 IP6STAT_INC(ip6s_cantforward);
892 goto bad;
893 }
894 } else if (!ours) {
895 ip6_forward(m, srcrt);
896 return;
897 }
898
899 /*
900 * Tell launch routine the next header
901 */
902 IP6STAT_INC(ip6s_delivered);
903 in6_ifstat_inc(rcvif, ifs6_in_deliver);
904 nest = 0;
905
906 while (nxt != IPPROTO_DONE) {
907 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
908 IP6STAT_INC(ip6s_toomanyhdr);
909 goto bad;
910 }
911
912 /*
913 * protection against faulty packet - there should be
914 * more sanity checks in header chain processing.
915 */
916 if (m->m_pkthdr.len < off) {
917 IP6STAT_INC(ip6s_tooshort);
918 in6_ifstat_inc(rcvif, ifs6_in_truncated);
919 goto bad;
920 }
921
922 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
923 if (IPSEC_ENABLED(ipv6)) {
924 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
925 return;
926 }
927 #endif /* IPSEC */
928
929 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
930 }
931 return;
932 bad:
933 in6_ifstat_inc(rcvif, ifs6_in_discard);
934 if (m != NULL)
935 m_freem(m);
936 }
937
938 /*
939 * Hop-by-Hop options header processing. If a valid jumbo payload option is
940 * included, the real payload length will be stored in plenp.
941 *
942 * rtalertp - XXX: should be stored more smart way
943 */
944 static int
ip6_hopopts_input(u_int32_t * plenp,u_int32_t * rtalertp,struct mbuf ** mp,int * offp)945 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
946 struct mbuf **mp, int *offp)
947 {
948 struct mbuf *m = *mp;
949 int off = *offp, hbhlen;
950 struct ip6_hbh *hbh;
951
952 /* validation of the length of the header */
953 if (m->m_len < off + sizeof(*hbh)) {
954 m = m_pullup(m, off + sizeof(*hbh));
955 if (m == NULL) {
956 IP6STAT_INC(ip6s_exthdrtoolong);
957 *mp = NULL;
958 return (-1);
959 }
960 }
961 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
962 hbhlen = (hbh->ip6h_len + 1) << 3;
963
964 if (m->m_len < off + hbhlen) {
965 m = m_pullup(m, off + hbhlen);
966 if (m == NULL) {
967 IP6STAT_INC(ip6s_exthdrtoolong);
968 *mp = NULL;
969 return (-1);
970 }
971 }
972 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
973 off += hbhlen;
974 hbhlen -= sizeof(struct ip6_hbh);
975 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
976 hbhlen, rtalertp, plenp) < 0) {
977 *mp = NULL;
978 return (-1);
979 }
980
981 *offp = off;
982 *mp = m;
983 return (0);
984 }
985
986 /*
987 * Search header for all Hop-by-hop options and process each option.
988 * This function is separate from ip6_hopopts_input() in order to
989 * handle a case where the sending node itself process its hop-by-hop
990 * options header. In such a case, the function is called from ip6_output().
991 *
992 * The function assumes that hbh header is located right after the IPv6 header
993 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
994 * opthead + hbhlen is located in contiguous memory region.
995 */
996 int
ip6_process_hopopts(struct mbuf * m,u_int8_t * opthead,int hbhlen,u_int32_t * rtalertp,u_int32_t * plenp)997 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
998 u_int32_t *rtalertp, u_int32_t *plenp)
999 {
1000 struct ip6_hdr *ip6;
1001 int optlen = 0;
1002 u_int8_t *opt = opthead;
1003 u_int16_t rtalert_val;
1004 u_int32_t jumboplen;
1005 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1006
1007 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1008 switch (*opt) {
1009 case IP6OPT_PAD1:
1010 optlen = 1;
1011 break;
1012 case IP6OPT_PADN:
1013 if (hbhlen < IP6OPT_MINLEN) {
1014 IP6STAT_INC(ip6s_toosmall);
1015 goto bad;
1016 }
1017 optlen = *(opt + 1) + 2;
1018 break;
1019 case IP6OPT_ROUTER_ALERT:
1020 /* XXX may need check for alignment */
1021 if (hbhlen < IP6OPT_RTALERT_LEN) {
1022 IP6STAT_INC(ip6s_toosmall);
1023 goto bad;
1024 }
1025 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1026 /* XXX stat */
1027 icmp6_error(m, ICMP6_PARAM_PROB,
1028 ICMP6_PARAMPROB_HEADER,
1029 erroff + opt + 1 - opthead);
1030 return (-1);
1031 }
1032 optlen = IP6OPT_RTALERT_LEN;
1033 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1034 *rtalertp = ntohs(rtalert_val);
1035 break;
1036 case IP6OPT_JUMBO:
1037 /* XXX may need check for alignment */
1038 if (hbhlen < IP6OPT_JUMBO_LEN) {
1039 IP6STAT_INC(ip6s_toosmall);
1040 goto bad;
1041 }
1042 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
1043 /* XXX stat */
1044 icmp6_error(m, ICMP6_PARAM_PROB,
1045 ICMP6_PARAMPROB_HEADER,
1046 erroff + opt + 1 - opthead);
1047 return (-1);
1048 }
1049 optlen = IP6OPT_JUMBO_LEN;
1050
1051 /*
1052 * IPv6 packets that have non 0 payload length
1053 * must not contain a jumbo payload option.
1054 */
1055 ip6 = mtod(m, struct ip6_hdr *);
1056 if (ip6->ip6_plen) {
1057 IP6STAT_INC(ip6s_badoptions);
1058 icmp6_error(m, ICMP6_PARAM_PROB,
1059 ICMP6_PARAMPROB_HEADER,
1060 erroff + opt - opthead);
1061 return (-1);
1062 }
1063
1064 /*
1065 * We may see jumbolen in unaligned location, so
1066 * we'd need to perform bcopy().
1067 */
1068 bcopy(opt + 2, &jumboplen, sizeof(jumboplen));
1069 jumboplen = (u_int32_t)htonl(jumboplen);
1070
1071 #if 1
1072 /*
1073 * if there are multiple jumbo payload options,
1074 * *plenp will be non-zero and the packet will be
1075 * rejected.
1076 * the behavior may need some debate in ipngwg -
1077 * multiple options does not make sense, however,
1078 * there's no explicit mention in specification.
1079 */
1080 if (*plenp != 0) {
1081 IP6STAT_INC(ip6s_badoptions);
1082 icmp6_error(m, ICMP6_PARAM_PROB,
1083 ICMP6_PARAMPROB_HEADER,
1084 erroff + opt + 2 - opthead);
1085 return (-1);
1086 }
1087 #endif
1088
1089 /*
1090 * jumbo payload length must be larger than 65535.
1091 */
1092 if (jumboplen <= IPV6_MAXPACKET) {
1093 IP6STAT_INC(ip6s_badoptions);
1094 icmp6_error(m, ICMP6_PARAM_PROB,
1095 ICMP6_PARAMPROB_HEADER,
1096 erroff + opt + 2 - opthead);
1097 return (-1);
1098 }
1099 *plenp = jumboplen;
1100
1101 break;
1102 default: /* unknown option */
1103 if (hbhlen < IP6OPT_MINLEN) {
1104 IP6STAT_INC(ip6s_toosmall);
1105 goto bad;
1106 }
1107 optlen = ip6_unknown_opt(opt, m,
1108 erroff + opt - opthead);
1109 if (optlen == -1)
1110 return (-1);
1111 optlen += 2;
1112 break;
1113 }
1114 }
1115
1116 return (0);
1117
1118 bad:
1119 m_freem(m);
1120 return (-1);
1121 }
1122
1123 /*
1124 * Unknown option processing.
1125 * The third argument `off' is the offset from the IPv6 header to the option,
1126 * which is necessary if the IPv6 header the and option header and IPv6 header
1127 * is not contiguous in order to return an ICMPv6 error.
1128 */
1129 int
ip6_unknown_opt(u_int8_t * optp,struct mbuf * m,int off)1130 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1131 {
1132 struct ip6_hdr *ip6;
1133
1134 switch (IP6OPT_TYPE(*optp)) {
1135 case IP6OPT_TYPE_SKIP: /* ignore the option */
1136 return ((int)*(optp + 1));
1137 case IP6OPT_TYPE_DISCARD: /* silently discard */
1138 m_freem(m);
1139 return (-1);
1140 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1141 IP6STAT_INC(ip6s_badoptions);
1142 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1143 return (-1);
1144 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1145 IP6STAT_INC(ip6s_badoptions);
1146 ip6 = mtod(m, struct ip6_hdr *);
1147 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1148 (m->m_flags & (M_BCAST|M_MCAST)))
1149 m_freem(m);
1150 else
1151 icmp6_error(m, ICMP6_PARAM_PROB,
1152 ICMP6_PARAMPROB_OPTION, off);
1153 return (-1);
1154 }
1155
1156 m_freem(m); /* XXX: NOTREACHED */
1157 return (-1);
1158 }
1159
1160 /*
1161 * Create the "control" list for this pcb.
1162 * These functions will not modify mbuf chain at all.
1163 *
1164 * The routine will be called from upper layer handlers like tcp6_input().
1165 * Thus the routine assumes that the caller (tcp6_input) have already
1166 * called m_pullup() and all the extension headers are located in the
1167 * very first mbuf on the mbuf chain.
1168 *
1169 * ip6_savecontrol_v4 will handle those options that are possible to be
1170 * set on a v4-mapped socket.
1171 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1172 * options and handle the v6-only ones itself.
1173 */
1174 struct mbuf **
ip6_savecontrol_v4(struct inpcb * inp,struct mbuf * m,struct mbuf ** mp,int * v4only)1175 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1176 int *v4only)
1177 {
1178 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1179
1180 #ifdef SO_TIMESTAMP
1181 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) {
1182 union {
1183 struct timeval tv;
1184 struct bintime bt;
1185 struct timespec ts;
1186 } t;
1187 struct bintime boottimebin, bt1;
1188 struct timespec ts1;
1189 bool stamped;
1190
1191 stamped = false;
1192 switch (inp->inp_socket->so_ts_clock) {
1193 case SO_TS_REALTIME_MICRO:
1194 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1195 M_TSTMP)) {
1196 mbuf_tstmp2timespec(m, &ts1);
1197 timespec2bintime(&ts1, &bt1);
1198 getboottimebin(&boottimebin);
1199 bintime_add(&bt1, &boottimebin);
1200 bintime2timeval(&bt1, &t.tv);
1201 } else {
1202 microtime(&t.tv);
1203 }
1204 *mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv),
1205 SCM_TIMESTAMP, SOL_SOCKET);
1206 if (*mp != NULL) {
1207 mp = &(*mp)->m_next;
1208 stamped = true;
1209 }
1210 break;
1211
1212 case SO_TS_BINTIME:
1213 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1214 M_TSTMP)) {
1215 mbuf_tstmp2timespec(m, &ts1);
1216 timespec2bintime(&ts1, &t.bt);
1217 getboottimebin(&boottimebin);
1218 bintime_add(&t.bt, &boottimebin);
1219 } else {
1220 bintime(&t.bt);
1221 }
1222 *mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt),
1223 SCM_BINTIME, SOL_SOCKET);
1224 if (*mp != NULL) {
1225 mp = &(*mp)->m_next;
1226 stamped = true;
1227 }
1228 break;
1229
1230 case SO_TS_REALTIME:
1231 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1232 M_TSTMP)) {
1233 mbuf_tstmp2timespec(m, &t.ts);
1234 getboottimebin(&boottimebin);
1235 bintime2timespec(&boottimebin, &ts1);
1236 timespecadd(&t.ts, &ts1, &t.ts);
1237 } else {
1238 nanotime(&t.ts);
1239 }
1240 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1241 SCM_REALTIME, SOL_SOCKET);
1242 if (*mp != NULL) {
1243 mp = &(*mp)->m_next;
1244 stamped = true;
1245 }
1246 break;
1247
1248 case SO_TS_MONOTONIC:
1249 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1250 M_TSTMP))
1251 mbuf_tstmp2timespec(m, &t.ts);
1252 else
1253 nanouptime(&t.ts);
1254 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts),
1255 SCM_MONOTONIC, SOL_SOCKET);
1256 if (*mp != NULL) {
1257 mp = &(*mp)->m_next;
1258 stamped = true;
1259 }
1260 break;
1261
1262 default:
1263 panic("unknown (corrupted) so_ts_clock");
1264 }
1265 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) ==
1266 (M_PKTHDR | M_TSTMP)) {
1267 struct sock_timestamp_info sti;
1268
1269 bzero(&sti, sizeof(sti));
1270 sti.st_info_flags = ST_INFO_HW;
1271 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1272 sti.st_info_flags |= ST_INFO_HW_HPREC;
1273 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti),
1274 SCM_TIME_INFO, SOL_SOCKET);
1275 if (*mp != NULL)
1276 mp = &(*mp)->m_next;
1277 }
1278 }
1279 #endif
1280
1281 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1282 /* RFC 2292 sec. 5 */
1283 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1284 struct in6_pktinfo pi6;
1285
1286 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1287 #ifdef INET
1288 struct ip *ip;
1289
1290 ip = mtod(m, struct ip *);
1291 pi6.ipi6_addr.s6_addr32[0] = 0;
1292 pi6.ipi6_addr.s6_addr32[1] = 0;
1293 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1294 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1295 #else
1296 /* We won't hit this code */
1297 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1298 #endif
1299 } else {
1300 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1301 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1302 }
1303 pi6.ipi6_ifindex =
1304 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1305
1306 *mp = sbcreatecontrol((caddr_t) &pi6,
1307 sizeof(struct in6_pktinfo),
1308 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
1309 if (*mp)
1310 mp = &(*mp)->m_next;
1311 }
1312
1313 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1314 int hlim;
1315
1316 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1317 #ifdef INET
1318 struct ip *ip;
1319
1320 ip = mtod(m, struct ip *);
1321 hlim = ip->ip_ttl;
1322 #else
1323 /* We won't hit this code */
1324 hlim = 0;
1325 #endif
1326 } else {
1327 hlim = ip6->ip6_hlim & 0xff;
1328 }
1329 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int),
1330 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1331 IPPROTO_IPV6);
1332 if (*mp)
1333 mp = &(*mp)->m_next;
1334 }
1335
1336 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1337 int tclass;
1338
1339 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1340 #ifdef INET
1341 struct ip *ip;
1342
1343 ip = mtod(m, struct ip *);
1344 tclass = ip->ip_tos;
1345 #else
1346 /* We won't hit this code */
1347 tclass = 0;
1348 #endif
1349 } else {
1350 u_int32_t flowinfo;
1351
1352 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1353 flowinfo >>= 20;
1354 tclass = flowinfo & 0xff;
1355 }
1356 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int),
1357 IPV6_TCLASS, IPPROTO_IPV6);
1358 if (*mp)
1359 mp = &(*mp)->m_next;
1360 }
1361
1362 if (v4only != NULL) {
1363 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1364 *v4only = 1;
1365 } else {
1366 *v4only = 0;
1367 }
1368 }
1369
1370 return (mp);
1371 }
1372
1373 void
ip6_savecontrol(struct inpcb * inp,struct mbuf * m,struct mbuf ** mp)1374 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp)
1375 {
1376 struct ip6_hdr *ip6;
1377 int v4only = 0;
1378
1379 mp = ip6_savecontrol_v4(inp, m, mp, &v4only);
1380 if (v4only)
1381 return;
1382
1383 ip6 = mtod(m, struct ip6_hdr *);
1384 /*
1385 * IPV6_HOPOPTS socket option. Recall that we required super-user
1386 * privilege for the option (see ip6_ctloutput), but it might be too
1387 * strict, since there might be some hop-by-hop options which can be
1388 * returned to normal user.
1389 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1390 */
1391 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
1392 /*
1393 * Check if a hop-by-hop options header is contatined in the
1394 * received packet, and if so, store the options as ancillary
1395 * data. Note that a hop-by-hop options header must be
1396 * just after the IPv6 header, which is assured through the
1397 * IPv6 input processing.
1398 */
1399 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1400 struct ip6_hbh *hbh;
1401 int hbhlen;
1402
1403 hbh = (struct ip6_hbh *)(ip6 + 1);
1404 hbhlen = (hbh->ip6h_len + 1) << 3;
1405
1406 /*
1407 * XXX: We copy the whole header even if a
1408 * jumbo payload option is included, the option which
1409 * is to be removed before returning according to
1410 * RFC2292.
1411 * Note: this constraint is removed in RFC3542
1412 */
1413 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
1414 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1415 IPPROTO_IPV6);
1416 if (*mp)
1417 mp = &(*mp)->m_next;
1418 }
1419 }
1420
1421 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1422 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1423
1424 /*
1425 * Search for destination options headers or routing
1426 * header(s) through the header chain, and stores each
1427 * header as ancillary data.
1428 * Note that the order of the headers remains in
1429 * the chain of ancillary data.
1430 */
1431 while (1) { /* is explicit loop prevention necessary? */
1432 struct ip6_ext *ip6e = NULL;
1433 int elen;
1434
1435 /*
1436 * if it is not an extension header, don't try to
1437 * pull it from the chain.
1438 */
1439 switch (nxt) {
1440 case IPPROTO_DSTOPTS:
1441 case IPPROTO_ROUTING:
1442 case IPPROTO_HOPOPTS:
1443 case IPPROTO_AH: /* is it possible? */
1444 break;
1445 default:
1446 goto loopend;
1447 }
1448
1449 if (off + sizeof(*ip6e) > m->m_len)
1450 goto loopend;
1451 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1452 if (nxt == IPPROTO_AH)
1453 elen = (ip6e->ip6e_len + 2) << 2;
1454 else
1455 elen = (ip6e->ip6e_len + 1) << 3;
1456 if (off + elen > m->m_len)
1457 goto loopend;
1458
1459 switch (nxt) {
1460 case IPPROTO_DSTOPTS:
1461 if (!(inp->inp_flags & IN6P_DSTOPTS))
1462 break;
1463
1464 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1465 IS2292(inp,
1466 IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1467 IPPROTO_IPV6);
1468 if (*mp)
1469 mp = &(*mp)->m_next;
1470 break;
1471 case IPPROTO_ROUTING:
1472 if (!(inp->inp_flags & IN6P_RTHDR))
1473 break;
1474
1475 *mp = sbcreatecontrol((caddr_t)ip6e, elen,
1476 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR),
1477 IPPROTO_IPV6);
1478 if (*mp)
1479 mp = &(*mp)->m_next;
1480 break;
1481 case IPPROTO_HOPOPTS:
1482 case IPPROTO_AH: /* is it possible? */
1483 break;
1484
1485 default:
1486 /*
1487 * other cases have been filtered in the above.
1488 * none will visit this case. here we supply
1489 * the code just in case (nxt overwritten or
1490 * other cases).
1491 */
1492 goto loopend;
1493 }
1494
1495 /* proceed with the next header. */
1496 off += elen;
1497 nxt = ip6e->ip6e_nxt;
1498 ip6e = NULL;
1499 }
1500 loopend:
1501 ;
1502 }
1503
1504 if (inp->inp_flags2 & INP_RECVFLOWID) {
1505 uint32_t flowid, flow_type;
1506
1507 flowid = m->m_pkthdr.flowid;
1508 flow_type = M_HASHTYPE_GET(m);
1509
1510 /*
1511 * XXX should handle the failure of one or the
1512 * other - don't populate both?
1513 */
1514 *mp = sbcreatecontrol((caddr_t) &flowid,
1515 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6);
1516 if (*mp)
1517 mp = &(*mp)->m_next;
1518 *mp = sbcreatecontrol((caddr_t) &flow_type,
1519 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6);
1520 if (*mp)
1521 mp = &(*mp)->m_next;
1522 }
1523
1524 #ifdef RSS
1525 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1526 uint32_t flowid, flow_type;
1527 uint32_t rss_bucketid;
1528
1529 flowid = m->m_pkthdr.flowid;
1530 flow_type = M_HASHTYPE_GET(m);
1531
1532 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1533 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1534 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6);
1535 if (*mp)
1536 mp = &(*mp)->m_next;
1537 }
1538 }
1539 #endif
1540
1541 }
1542 #undef IS2292
1543
1544 void
ip6_notify_pmtu(struct inpcb * inp,struct sockaddr_in6 * dst,u_int32_t mtu)1545 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1546 {
1547 struct socket *so;
1548 struct mbuf *m_mtu;
1549 struct ip6_mtuinfo mtuctl;
1550
1551 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1552 /*
1553 * Notify the error by sending IPV6_PATHMTU ancillary data if
1554 * application wanted to know the MTU value.
1555 * NOTE: we notify disconnected sockets, because some udp
1556 * applications keep sending sockets disconnected.
1557 * NOTE: our implementation doesn't notify connected sockets that has
1558 * foreign address that is different than given destination addresses
1559 * (this is permitted by RFC 3542).
1560 */
1561 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1562 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1563 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1564 return;
1565
1566 mtuctl.ip6m_mtu = mtu;
1567 mtuctl.ip6m_addr = *dst;
1568 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1569 return;
1570
1571 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl),
1572 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
1573 return;
1574
1575 so = inp->inp_socket;
1576 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1577 == 0) {
1578 soroverflow(so);
1579 m_freem(m_mtu);
1580 /* XXX: should count statistics */
1581 } else
1582 sorwakeup(so);
1583 }
1584
1585 /*
1586 * Get pointer to the previous header followed by the header
1587 * currently processed.
1588 */
1589 int
ip6_get_prevhdr(const struct mbuf * m,int off)1590 ip6_get_prevhdr(const struct mbuf *m, int off)
1591 {
1592 struct ip6_ext ip6e;
1593 struct ip6_hdr *ip6;
1594 int len, nlen, nxt;
1595
1596 if (off == sizeof(struct ip6_hdr))
1597 return (offsetof(struct ip6_hdr, ip6_nxt));
1598 if (off < sizeof(struct ip6_hdr))
1599 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1600
1601 ip6 = mtod(m, struct ip6_hdr *);
1602 nxt = ip6->ip6_nxt;
1603 len = sizeof(struct ip6_hdr);
1604 nlen = 0;
1605 while (len < off) {
1606 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e);
1607 switch (nxt) {
1608 case IPPROTO_FRAGMENT:
1609 nlen = sizeof(struct ip6_frag);
1610 break;
1611 case IPPROTO_AH:
1612 nlen = (ip6e.ip6e_len + 2) << 2;
1613 break;
1614 default:
1615 nlen = (ip6e.ip6e_len + 1) << 3;
1616 }
1617 len += nlen;
1618 nxt = ip6e.ip6e_nxt;
1619 }
1620 return (len - nlen);
1621 }
1622
1623 /*
1624 * get next header offset. m will be retained.
1625 */
1626 int
ip6_nexthdr(const struct mbuf * m,int off,int proto,int * nxtp)1627 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1628 {
1629 struct ip6_hdr ip6;
1630 struct ip6_ext ip6e;
1631 struct ip6_frag fh;
1632
1633 /* just in case */
1634 if (m == NULL)
1635 panic("ip6_nexthdr: m == NULL");
1636 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1637 return -1;
1638
1639 switch (proto) {
1640 case IPPROTO_IPV6:
1641 if (m->m_pkthdr.len < off + sizeof(ip6))
1642 return -1;
1643 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1644 if (nxtp)
1645 *nxtp = ip6.ip6_nxt;
1646 off += sizeof(ip6);
1647 return off;
1648
1649 case IPPROTO_FRAGMENT:
1650 /*
1651 * terminate parsing if it is not the first fragment,
1652 * it does not make sense to parse through it.
1653 */
1654 if (m->m_pkthdr.len < off + sizeof(fh))
1655 return -1;
1656 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1657 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1658 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1659 return -1;
1660 if (nxtp)
1661 *nxtp = fh.ip6f_nxt;
1662 off += sizeof(struct ip6_frag);
1663 return off;
1664
1665 case IPPROTO_AH:
1666 if (m->m_pkthdr.len < off + sizeof(ip6e))
1667 return -1;
1668 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1669 if (nxtp)
1670 *nxtp = ip6e.ip6e_nxt;
1671 off += (ip6e.ip6e_len + 2) << 2;
1672 return off;
1673
1674 case IPPROTO_HOPOPTS:
1675 case IPPROTO_ROUTING:
1676 case IPPROTO_DSTOPTS:
1677 if (m->m_pkthdr.len < off + sizeof(ip6e))
1678 return -1;
1679 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1680 if (nxtp)
1681 *nxtp = ip6e.ip6e_nxt;
1682 off += (ip6e.ip6e_len + 1) << 3;
1683 return off;
1684
1685 case IPPROTO_NONE:
1686 case IPPROTO_ESP:
1687 case IPPROTO_IPCOMP:
1688 /* give up */
1689 return -1;
1690
1691 default:
1692 return -1;
1693 }
1694
1695 /* NOTREACHED */
1696 }
1697
1698 /*
1699 * get offset for the last header in the chain. m will be kept untainted.
1700 */
1701 int
ip6_lasthdr(const struct mbuf * m,int off,int proto,int * nxtp)1702 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1703 {
1704 int newoff;
1705 int nxt;
1706
1707 if (!nxtp) {
1708 nxt = -1;
1709 nxtp = &nxt;
1710 }
1711 while (1) {
1712 newoff = ip6_nexthdr(m, off, proto, nxtp);
1713 if (newoff < 0)
1714 return off;
1715 else if (newoff < off)
1716 return -1; /* invalid */
1717 else if (newoff == off)
1718 return newoff;
1719
1720 off = newoff;
1721 proto = *nxtp;
1722 }
1723 }
1724
1725 /*
1726 * System control for IP6
1727 */
1728
1729 u_char inet6ctlerrmap[PRC_NCMDS] = {
1730 0, 0, 0, 0,
1731 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1732 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1733 EMSGSIZE, EHOSTUNREACH, 0, 0,
1734 0, 0, EHOSTUNREACH, 0,
1735 ENOPROTOOPT, ECONNREFUSED
1736 };
1737