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
63 #include "opt_inet.h"
64 #include "opt_inet6.h"
65 #include "opt_ipsec.h"
66 #include "opt_rss.h"
67 #include "opt_sctp.h"
68
69 #include <sys/param.h>
70 #include <sys/systm.h>
71 #include <sys/hhook.h>
72 #include <sys/malloc.h>
73 #include <sys/mbuf.h>
74 #include <sys/proc.h>
75 #include <sys/domain.h>
76 #include <sys/protosw.h>
77 #include <sys/sdt.h>
78 #include <sys/socket.h>
79 #include <sys/socketvar.h>
80 #include <sys/errno.h>
81 #include <sys/time.h>
82 #include <sys/kernel.h>
83 #include <sys/lock.h>
84 #include <sys/rmlock.h>
85 #include <sys/syslog.h>
86 #include <sys/sysctl.h>
87 #include <sys/eventhandler.h>
88
89 #include <net/if.h>
90 #include <net/if_var.h>
91 #include <net/if_types.h>
92 #include <net/if_private.h>
93 #include <net/if_dl.h>
94 #include <net/route.h>
95 #include <net/netisr.h>
96 #include <net/rss_config.h>
97 #include <net/pfil.h>
98 #include <net/vnet.h>
99
100 #include <netinet/in.h>
101 #include <netinet/in_kdtrace.h>
102 #include <netinet/ip_var.h>
103 #include <netinet/in_systm.h>
104 #include <net/if_llatbl.h>
105 #ifdef INET
106 #include <netinet/ip.h>
107 #include <netinet/ip_icmp.h>
108 #endif /* INET */
109 #include <netinet/ip6.h>
110 #include <netinet6/in6_var.h>
111 #include <netinet6/ip6_var.h>
112 #include <netinet/ip_encap.h>
113 #include <netinet/in_pcb.h>
114 #include <netinet/icmp6.h>
115 #include <netinet6/scope6_var.h>
116 #include <netinet6/in6_ifattach.h>
117 #include <netinet6/mld6_var.h>
118 #include <netinet6/nd6.h>
119 #include <netinet6/in6_rss.h>
120 #include <netinet6/ip6_mroute.h>
121 #ifdef SCTP
122 #include <netinet/sctp_pcb.h>
123 #include <netinet6/sctp6_var.h>
124 #endif
125
126 #include <netipsec/ipsec_support.h>
127
128 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = {
129 [0 ... IPPROTO_MAX - 1] = rip6_input };
130 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = {
131 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput };
132
133 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead);
134 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl);
135 VNET_DEFINE(u_long, in6_ifaddrhmask);
136
137 static struct netisr_handler ip6_nh = {
138 .nh_name = "ip6",
139 .nh_handler = ip6_input,
140 .nh_proto = NETISR_IPV6,
141 #ifdef RSS
142 .nh_m2cpuid = rss_soft_m2cpuid_v6,
143 .nh_policy = NETISR_POLICY_CPU,
144 .nh_dispatch = NETISR_DISPATCH_HYBRID,
145 #else
146 .nh_policy = NETISR_POLICY_FLOW,
147 #endif
148 };
149
150 static int
sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)151 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
152 {
153 int error, qlimit;
154
155 netisr_getqlimit(&ip6_nh, &qlimit);
156 error = sysctl_handle_int(oidp, &qlimit, 0, req);
157 if (error || !req->newptr)
158 return (error);
159 if (qlimit < 1)
160 return (EINVAL);
161 return (netisr_setqlimit(&ip6_nh, qlimit));
162 }
163 SYSCTL_DECL(_net_inet6_ip6);
164 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen,
165 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
166 0, 0, sysctl_netinet6_intr_queue_maxlen, "I",
167 "Maximum size of the IPv6 input queue");
168
169 VNET_DEFINE_STATIC(bool, ip6_sav) = true;
170 #define V_ip6_sav VNET(ip6_sav)
171 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation,
172 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true,
173 "Drop incoming packets with source address that is a local address");
174
175 SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, temp_max_desync_factor,
176 CTLFLAG_RD | CTLFLAG_VNET,
177 &VNET_NAME(ip6_temp_max_desync_factor), 0,
178 "RFC 8981 max desync factor");
179
180 #ifdef RSS
181 static struct netisr_handler ip6_direct_nh = {
182 .nh_name = "ip6_direct",
183 .nh_handler = ip6_direct_input,
184 .nh_proto = NETISR_IPV6_DIRECT,
185 .nh_m2cpuid = rss_soft_m2cpuid_v6,
186 .nh_policy = NETISR_POLICY_CPU,
187 .nh_dispatch = NETISR_DISPATCH_HYBRID,
188 };
189
190 static int
sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)191 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
192 {
193 int error, qlimit;
194
195 netisr_getqlimit(&ip6_direct_nh, &qlimit);
196 error = sysctl_handle_int(oidp, &qlimit, 0, req);
197 if (error || !req->newptr)
198 return (error);
199 if (qlimit < 1)
200 return (EINVAL);
201 return (netisr_setqlimit(&ip6_direct_nh, qlimit));
202 }
203 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
204 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
205 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I",
206 "Maximum size of the IPv6 direct input queue");
207
208 #endif
209
210 VNET_DEFINE(pfil_head_t, inet6_pfil_head);
211 VNET_DEFINE(pfil_head_t, inet6_local_pfil_head);
212
213 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat);
214 VNET_PCPUSTAT_SYSINIT(ip6stat);
215 #ifdef VIMAGE
216 VNET_PCPUSTAT_SYSUNINIT(ip6stat);
217 #endif /* VIMAGE */
218
219 struct rmlock in6_ifaddr_lock;
220 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock");
221
222 static int ip6_hopopts_input(u_int32_t *, struct mbuf **, int *);
223
224 /*
225 * IP6 initialization: fill in IP6 protocol switch table.
226 * All protocols not implemented in kernel go to raw IP6 protocol handler.
227 */
228 static void
ip6_vnet_init(void * arg __unused)229 ip6_vnet_init(void *arg __unused)
230 {
231 struct pfil_head_args args;
232
233 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal",
234 &V_ip6_auto_linklocal);
235 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv);
236 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr);
237 TUNABLE_BOOL_FETCH("net.inet6.ip6.use_stableaddr", &V_ip6_use_stableaddr);
238
239 CK_STAILQ_INIT(&V_in6_ifaddrhead);
240 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR,
241 &V_in6_ifaddrhmask);
242
243 /* Initialize packet filter hooks. */
244 args.pa_version = PFIL_VERSION;
245 args.pa_flags = PFIL_IN | PFIL_OUT;
246 args.pa_type = PFIL_TYPE_IP6;
247 args.pa_headname = PFIL_INET6_NAME;
248 V_inet6_pfil_head = pfil_head_register(&args);
249
250 args.pa_flags = PFIL_OUT;
251 args.pa_headname = PFIL_INET6_LOCAL_NAME;
252 V_inet6_local_pfil_head = pfil_head_register(&args);
253
254 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6,
255 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6],
256 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
257 printf("%s: WARNING: unable to register input helper hook\n",
258 __func__);
259 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6,
260 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6],
261 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
262 printf("%s: WARNING: unable to register output helper hook\n",
263 __func__);
264
265 scope6_init();
266 addrsel_policy_init();
267 nd6_init();
268 frag6_init();
269
270 V_ip6_temp_max_desync_factor = TEMP_MAX_DESYNC_FACTOR_BASE +
271 (V_ip6_temp_preferred_lifetime >> 2) +
272 (V_ip6_temp_preferred_lifetime >> 3);
273 V_ip6_desync_factor = arc4random() % V_ip6_temp_max_desync_factor;
274
275 /* Skip global initialization stuff for non-default instances. */
276 #ifdef VIMAGE
277 netisr_register_vnet(&ip6_nh);
278 #ifdef RSS
279 netisr_register_vnet(&ip6_direct_nh);
280 #endif
281 #endif
282 }
283 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
284 ip6_vnet_init, NULL);
285
286 static void
ip6_init(void * arg __unused)287 ip6_init(void *arg __unused)
288 {
289 struct ifnet *ifp;
290
291 /*
292 * Register statically those protocols that are unlikely to ever go
293 * dynamic.
294 */
295 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput);
296 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL);
297 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL);
298 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL);
299 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL);
300 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL);
301 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL);
302 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL);
303 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL);
304 #ifdef SCTP /* XXX: has a loadable & static version */
305 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput);
306 #endif
307
308 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT);
309 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL,
310 LOWMEM_PRI_DEFAULT);
311
312 netisr_register(&ip6_nh);
313 #ifdef RSS
314 netisr_register(&ip6_direct_nh);
315 #endif
316 /*
317 * XXXGL: we use SYSINIT() here, but go over V_ifnet. See comment
318 * in sys/netinet/ip_input.c:ip_init().
319 */
320 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link)
321 in6_ifarrival(NULL, ifp);
322 }
323 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL);
324
325 int
ip6proto_register(uint8_t proto,ip6proto_input_t input,ip6proto_ctlinput_t ctl)326 ip6proto_register(uint8_t proto, ip6proto_input_t input,
327 ip6proto_ctlinput_t ctl)
328 {
329
330 MPASS(proto > 0);
331
332 if (ip6_protox[proto] == rip6_input) {
333 ip6_protox[proto] = input;
334 ip6_ctlprotox[proto] = ctl;
335 return (0);
336 } else
337 return (EEXIST);
338 }
339
340 int
ip6proto_unregister(uint8_t proto)341 ip6proto_unregister(uint8_t proto)
342 {
343
344 MPASS(proto > 0);
345
346 if (ip6_protox[proto] != rip6_input) {
347 ip6_protox[proto] = rip6_input;
348 ip6_ctlprotox[proto] = rip6_ctlinput;
349 return (0);
350 } else
351 return (ENOENT);
352 }
353
354 #ifdef VIMAGE
355 static void
ip6_destroy(void * unused __unused)356 ip6_destroy(void *unused __unused)
357 {
358 struct ifaddr *ifa, *nifa;
359 struct ifnet *ifp;
360 int error;
361
362 #ifdef RSS
363 netisr_unregister_vnet(&ip6_direct_nh);
364 #endif
365 netisr_unregister_vnet(&ip6_nh);
366
367 pfil_head_unregister(V_inet6_pfil_head);
368 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]);
369 if (error != 0) {
370 printf("%s: WARNING: unable to deregister input helper hook "
371 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: "
372 "error %d returned\n", __func__, error);
373 }
374 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]);
375 if (error != 0) {
376 printf("%s: WARNING: unable to deregister output helper hook "
377 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: "
378 "error %d returned\n", __func__, error);
379 }
380
381 /* Cleanup addresses. */
382 IFNET_RLOCK();
383 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
384 /* Cannot lock here - lock recursion. */
385 /* IF_ADDR_LOCK(ifp); */
386 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
387 if (ifa->ifa_addr->sa_family != AF_INET6)
388 continue;
389 in6_purgeaddr(ifa);
390 }
391 /* IF_ADDR_UNLOCK(ifp); */
392 in6_ifdetach_destroy(ifp);
393 }
394 IFNET_RUNLOCK();
395
396 /* Make sure any routes are gone as well. */
397 rib_flush_routes_family(AF_INET6);
398
399 frag6_destroy();
400 nd6_destroy();
401 addrsel_policy_destroy();
402 in6_ifattach_destroy();
403
404 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask);
405 }
406
407 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL);
408 #endif
409
410 static int
ip6_input_hbh(struct mbuf ** mp,uint32_t * rtalert,int * off,int * nxt,int * ours)411 ip6_input_hbh(struct mbuf **mp, uint32_t *rtalert, int *off,
412 int *nxt, int *ours)
413 {
414 struct mbuf *m;
415 struct ip6_hdr *ip6;
416 struct ip6_hbh *hbh;
417
418 if (ip6_hopopts_input(rtalert, mp, off)) {
419 #if 0 /*touches NULL pointer*/
420 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard);
421 #endif
422 goto out; /* m have already been freed */
423 }
424
425 m = *mp;
426 ip6 = mtod(m, struct ip6_hdr *);
427
428 /* ip6_hopopts_input() ensures that mbuf is contiguous */
429 hbh = (struct ip6_hbh *)(ip6 + 1);
430 *nxt = hbh->ip6h_nxt;
431
432 /*
433 * If we are acting as a router and the packet contains a
434 * router alert option, see if we know the option value.
435 * Currently, we only support the option value for MLD, in which
436 * case we should pass the packet to the multicast routing
437 * daemon.
438 */
439 if (*rtalert != ~0) {
440 switch (*rtalert) {
441 case IP6OPT_RTALERT_MLD:
442 if (V_ip6_forwarding)
443 *ours = 1;
444 break;
445 default:
446 /*
447 * RFC2711 requires unrecognized values must be
448 * silently ignored.
449 */
450 break;
451 }
452 }
453
454 return (0);
455
456 out:
457 return (1);
458 }
459
460 #ifdef RSS
461 /*
462 * IPv6 direct input routine.
463 *
464 * This is called when reinjecting completed fragments where
465 * all of the previous checking and book-keeping has been done.
466 */
467 void
ip6_direct_input(struct mbuf * m)468 ip6_direct_input(struct mbuf *m)
469 {
470 int off, nxt;
471 int nest;
472 struct m_tag *mtag;
473 struct ip6_direct_ctx *ip6dc;
474
475 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL);
476 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!"));
477
478 ip6dc = (struct ip6_direct_ctx *)(mtag + 1);
479 nxt = ip6dc->ip6dc_nxt;
480 off = ip6dc->ip6dc_off;
481
482 nest = 0;
483
484 m_tag_delete(m, mtag);
485
486 while (nxt != IPPROTO_DONE) {
487 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
488 IP6STAT_INC(ip6s_toomanyhdr);
489 goto bad;
490 }
491
492 /*
493 * protection against faulty packet - there should be
494 * more sanity checks in header chain processing.
495 */
496 if (m->m_pkthdr.len < off) {
497 IP6STAT_INC(ip6s_tooshort);
498 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
499 goto bad;
500 }
501
502 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
503 if (IPSEC_ENABLED(ipv6)) {
504 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
505 return;
506 }
507 #endif /* IPSEC */
508
509 nxt = ip6_protox[nxt](&m, &off, nxt);
510 }
511 return;
512 bad:
513 m_freem(m);
514 }
515 #endif
516
517 void
ip6_input(struct mbuf * m)518 ip6_input(struct mbuf *m)
519 {
520 struct in6_addr odst;
521 struct ip6_hdr *ip6;
522 struct in6_ifaddr *ia;
523 struct ifnet *rcvif;
524 u_int32_t plen;
525 u_int32_t rtalert = ~0;
526 int off = sizeof(struct ip6_hdr), nest;
527 int nxt, ours = 0;
528 int srcrt = 0;
529
530 /*
531 * Drop the packet if IPv6 operation is disabled on the interface.
532 */
533 rcvif = m->m_pkthdr.rcvif;
534 if ((rcvif->if_inet6->nd_flags & ND6_IFF_IFDISABLED))
535 goto bad;
536
537 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
538 /*
539 * should the inner packet be considered authentic?
540 * see comment in ah4_input().
541 * NB: m cannot be NULL when passed to the input routine
542 */
543
544 m->m_flags &= ~M_AUTHIPHDR;
545 m->m_flags &= ~M_AUTHIPDGM;
546
547 #endif /* IPSEC */
548
549 if (m->m_flags & M_FASTFWD_OURS) {
550 /*
551 * Firewall changed destination to local.
552 */
553 ip6 = mtod(m, struct ip6_hdr *);
554 goto passin;
555 }
556
557 /*
558 * mbuf statistics
559 */
560 if (m->m_flags & M_EXT) {
561 if (m->m_next)
562 IP6STAT_INC(ip6s_mext2m);
563 else
564 IP6STAT_INC(ip6s_mext1);
565 } else {
566 if (m->m_next) {
567 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif;
568 int ifindex = ifp->if_index;
569 if (ifindex >= IP6S_M2MMAX)
570 ifindex = 0;
571 IP6STAT_INC2(ip6s_m2m, ifindex);
572 } else
573 IP6STAT_INC(ip6s_m1);
574 }
575
576 in6_ifstat_inc(rcvif, ifs6_in_receive);
577 IP6STAT_INC(ip6s_total);
578
579 /*
580 * L2 bridge code and some other code can return mbuf chain
581 * that does not conform to KAME requirement. too bad.
582 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram?
583 */
584 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) {
585 struct mbuf *n;
586
587 if (m->m_pkthdr.len > MHLEN)
588 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
589 else
590 n = m_gethdr(M_NOWAIT, MT_DATA);
591 if (n == NULL)
592 goto bad;
593
594 m_move_pkthdr(n, m);
595 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t));
596 n->m_len = n->m_pkthdr.len;
597 m_freem(m);
598 m = n;
599 }
600 if (m->m_len < sizeof(struct ip6_hdr)) {
601 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
602 IP6STAT_INC(ip6s_toosmall);
603 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
604 goto bad;
605 }
606 }
607
608 ip6 = mtod(m, struct ip6_hdr *);
609 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
610 IP6STAT_INC(ip6s_badvers);
611 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
612 goto bad;
613 }
614
615 IP6STAT_INC2(ip6s_nxthist, ip6->ip6_nxt);
616 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6);
617
618 /*
619 * Check against address spoofing/corruption. The unspecified address
620 * is checked further below.
621 */
622 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) {
623 /*
624 * XXX: "badscope" is not very suitable for a multicast source.
625 */
626 IP6STAT_INC(ip6s_badscope);
627 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
628 goto bad;
629 }
630 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) &&
631 !(m->m_flags & M_LOOP)) {
632 /*
633 * In this case, the packet should come from the loopback
634 * interface. However, we cannot just check the if_flags,
635 * because ip6_mloopback() passes the "actual" interface
636 * as the outgoing/incoming interface.
637 */
638 IP6STAT_INC(ip6s_badscope);
639 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
640 goto bad;
641 }
642 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) &&
643 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) {
644 /*
645 * RFC4291 2.7:
646 * Nodes must not originate a packet to a multicast address
647 * whose scop field contains the reserved value 0; if such
648 * a packet is received, it must be silently dropped.
649 */
650 IP6STAT_INC(ip6s_badscope);
651 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
652 goto bad;
653 }
654 /*
655 * The following check is not documented in specs. A malicious
656 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack
657 * and bypass security checks (act as if it was from 127.0.0.1 by using
658 * IPv6 src ::ffff:127.0.0.1). Be cautious.
659 *
660 * We have supported IPv6-only kernels for a few years and this issue
661 * has not come up. The world seems to move mostly towards not using
662 * v4mapped on the wire, so it makes sense for us to keep rejecting
663 * any such packets.
664 */
665 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
666 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
667 IP6STAT_INC(ip6s_badscope);
668 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
669 goto bad;
670 }
671 /*
672 * Try to forward the packet, but if we fail continue.
673 * ip6_tryforward() does not generate redirects, so fall
674 * through to normal processing if redirects are required.
675 * ip6_tryforward() does inbound and outbound packet firewall
676 * processing. If firewall has decided that destination becomes
677 * our local address, it sets M_FASTFWD_OURS flag. In this
678 * case skip another inbound firewall processing and update
679 * ip6 pointer.
680 */
681 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0
682 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
683 && (!IPSEC_ENABLED(ipv6) ||
684 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0)
685 #endif
686 ) {
687 if ((m = ip6_tryforward(m)) == NULL)
688 return;
689 if (m->m_flags & M_FASTFWD_OURS) {
690 ip6 = mtod(m, struct ip6_hdr *);
691 goto passin;
692 }
693 }
694 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
695 /*
696 * Bypass packet filtering for packets previously handled by IPsec.
697 */
698 if (IPSEC_ENABLED(ipv6) &&
699 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0)
700 goto passin;
701 #endif
702 /*
703 * Run through list of hooks for input packets.
704 *
705 * NB: Beware of the destination address changing
706 * (e.g. by NAT rewriting). When this happens,
707 * tell ip6_forward to do the right thing.
708 */
709
710 /* Jump over all PFIL processing if hooks are not active. */
711 if (!PFIL_HOOKED_IN(V_inet6_pfil_head))
712 goto passin;
713
714 odst = ip6->ip6_dst;
715 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif,
716 NULL) != PFIL_PASS)
717 return;
718 ip6 = mtod(m, struct ip6_hdr *);
719 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
720 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP &&
721 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
722 /*
723 * Directly ship the packet on. This allows forwarding
724 * packets originally destined to us to some other directly
725 * connected host.
726 */
727 ip6_forward(m, 1);
728 return;
729 }
730
731 passin:
732 /*
733 * The check is deferred to here to give firewalls a chance to block
734 * (and log) such packets. ip6_tryforward() will not process such
735 * packets.
736 */
737 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) {
738 IP6STAT_INC(ip6s_badscope);
739 in6_ifstat_inc(rcvif, ifs6_in_addrerr);
740 goto bad;
741 }
742
743 plen = (uint32_t)ntohs(ip6->ip6_plen);
744
745 /*
746 * We don't support Jumbograms, reject packets with plen == 0 as early
747 * as we can.
748 */
749 if (__predict_false(plen == 0)) {
750 IP6STAT_INC(ip6s_tooshort);
751 in6_ifstat_inc(rcvif, ifs6_in_hdrerr);
752 goto bad;
753 }
754
755 /*
756 * Disambiguate address scope zones (if there is ambiguity).
757 * We first make sure that the original source or destination address
758 * is not in our internal form for scoped addresses. Such addresses
759 * are not necessarily invalid spec-wise, but we cannot accept them due
760 * to the usage conflict.
761 * in6_setscope() then also checks and rejects the cases where src or
762 * dst are the loopback address and the receiving interface
763 * is not loopback.
764 */
765 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
766 IP6STAT_INC(ip6s_badscope); /* XXX */
767 goto bad;
768 }
769 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) ||
770 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) {
771 IP6STAT_INC(ip6s_badscope);
772 goto bad;
773 }
774 if (m->m_flags & M_FASTFWD_OURS) {
775 m->m_flags &= ~M_FASTFWD_OURS;
776 ours = 1;
777 goto hbhcheck;
778 }
779 /*
780 * Multicast check. Assume packet is for us to avoid
781 * prematurely taking locks.
782 */
783 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
784 ours = 1;
785 in6_ifstat_inc(rcvif, ifs6_in_mcast);
786 goto hbhcheck;
787 }
788 /*
789 * Unicast check
790 * XXX: For now we keep link-local IPv6 addresses with embedded
791 * scope zone id, therefore we use zero zoneid here.
792 */
793 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
794 if (ia != NULL) {
795 if (ia->ia6_flags & IN6_IFF_NOTREADY) {
796 char ip6bufs[INET6_ADDRSTRLEN];
797 char ip6bufd[INET6_ADDRSTRLEN];
798 /* address is not ready, so discard the packet. */
799 nd6log((LOG_INFO,
800 "ip6_input: packet to an unready address %s->%s\n",
801 ip6_sprintf(ip6bufs, &ip6->ip6_src),
802 ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
803 goto bad;
804 }
805 if (V_ip6_sav && !(m->m_flags & M_LOOP) &&
806 __predict_false(in6_localip_fib(&ip6->ip6_src,
807 rcvif->if_fib))) {
808 IP6STAT_INC(ip6s_badscope); /* XXX */
809 goto bad;
810 }
811 /* Count the packet in the ip address stats */
812 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
813 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
814 ours = 1;
815 goto hbhcheck;
816 }
817
818 /*
819 * Now there is no reason to process the packet if it's not our own
820 * and we're not a router.
821 */
822 if (!V_ip6_forwarding) {
823 IP6STAT_INC(ip6s_cantforward);
824 goto bad;
825 }
826
827 hbhcheck:
828 /*
829 * Process Hop-by-Hop options header if it's contained.
830 * m may be modified in ip6_hopopts_input().
831 */
832 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
833 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0)
834 return;
835 } else
836 nxt = ip6->ip6_nxt;
837
838 /*
839 * Use mbuf flags to propagate Router Alert option to
840 * ICMPv6 layer, as hop-by-hop options have been stripped.
841 */
842 if (rtalert != ~0)
843 m->m_flags |= M_RTALERT_MLD;
844
845 /*
846 * Check that the amount of data in the buffers
847 * is as at least much as the IPv6 header would have us expect.
848 * Trim mbufs if longer than we expect.
849 * Drop packet if shorter than we expect.
850 */
851 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
852 IP6STAT_INC(ip6s_tooshort);
853 in6_ifstat_inc(rcvif, ifs6_in_truncated);
854 goto bad;
855 }
856 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
857 if (m->m_len == m->m_pkthdr.len) {
858 m->m_len = sizeof(struct ip6_hdr) + plen;
859 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
860 } else
861 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
862 }
863
864 /*
865 * Forward if desirable.
866 */
867 if (V_ip6_mrouting_enabled &&
868 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
869 /*
870 * If we are acting as a multicast router, all
871 * incoming multicast packets are passed to the
872 * kernel-level multicast forwarding function.
873 * The packet is returned (relatively) intact; if
874 * ip6_mforward() returns a non-zero value, the packet
875 * must be discarded, else it may be accepted below.
876 *
877 * XXX TODO: Check hlim and multicast scope here to avoid
878 * unnecessarily calling into ip6_mforward().
879 */
880 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) {
881 IP6STAT_INC(ip6s_cantforward);
882 goto bad;
883 }
884 } else if (!ours) {
885 ip6_forward(m, srcrt);
886 return;
887 }
888
889 /*
890 * We are going to ship the packet to the local protocol stack. Call the
891 * filter again for this 'output' action, allowing redirect-like rules
892 * to adjust the source address.
893 */
894 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) {
895 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) !=
896 PFIL_PASS)
897 return;
898 ip6 = mtod(m, struct ip6_hdr *);
899 }
900
901 /*
902 * Tell launch routine the next header
903 */
904 IP6STAT_INC(ip6s_delivered);
905 in6_ifstat_inc(rcvif, ifs6_in_deliver);
906 nest = 0;
907
908 while (nxt != IPPROTO_DONE) {
909 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
910 IP6STAT_INC(ip6s_toomanyhdr);
911 goto bad;
912 }
913
914 /*
915 * protection against faulty packet - there should be
916 * more sanity checks in header chain processing.
917 */
918 if (m->m_pkthdr.len < off) {
919 IP6STAT_INC(ip6s_tooshort);
920 in6_ifstat_inc(rcvif, ifs6_in_truncated);
921 goto bad;
922 }
923
924 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
925 if (IPSEC_ENABLED(ipv6)) {
926 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0)
927 return;
928 }
929 #endif /* IPSEC */
930
931 nxt = ip6_protox[nxt](&m, &off, nxt);
932 }
933 return;
934 bad:
935 in6_ifstat_inc(rcvif, ifs6_in_discard);
936 if (m != NULL)
937 m_freem(m);
938 }
939
940 /*
941 * Hop-by-Hop options header processing. If a valid jumbo payload option is
942 * included report an error.
943 *
944 * rtalertp - XXX: should be stored more smart way
945 */
946 static int
ip6_hopopts_input(u_int32_t * rtalertp,struct mbuf ** mp,int * offp)947 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp)
948 {
949 struct mbuf *m = *mp;
950 int off = *offp, hbhlen;
951 struct ip6_hbh *hbh;
952
953 /* validation of the length of the header */
954 if (m->m_len < off + sizeof(*hbh)) {
955 m = m_pullup(m, off + sizeof(*hbh));
956 if (m == NULL) {
957 IP6STAT_INC(ip6s_exthdrtoolong);
958 *mp = NULL;
959 return (-1);
960 }
961 }
962 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
963 hbhlen = (hbh->ip6h_len + 1) << 3;
964
965 if (m->m_len < off + hbhlen) {
966 m = m_pullup(m, off + hbhlen);
967 if (m == NULL) {
968 IP6STAT_INC(ip6s_exthdrtoolong);
969 *mp = NULL;
970 return (-1);
971 }
972 }
973 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
974 off += hbhlen;
975 hbhlen -= sizeof(struct ip6_hbh);
976 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
977 hbhlen, rtalertp) < 0) {
978 *mp = NULL;
979 return (-1);
980 }
981
982 *offp = off;
983 *mp = m;
984 return (0);
985 }
986
987 /*
988 * Search header for all Hop-by-hop options and process each option.
989 * This function is separate from ip6_hopopts_input() in order to
990 * handle a case where the sending node itself process its hop-by-hop
991 * options header. In such a case, the function is called from ip6_output().
992 *
993 * The function assumes that hbh header is located right after the IPv6 header
994 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to
995 * opthead + hbhlen is located in contiguous memory region.
996 */
997 int
ip6_process_hopopts(struct mbuf * m,u_int8_t * opthead,int hbhlen,u_int32_t * rtalertp)998 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
999 u_int32_t *rtalertp)
1000 {
1001 int optlen = 0;
1002 u_int8_t *opt = opthead;
1003 u_int16_t rtalert_val;
1004 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
1005
1006 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
1007 switch (*opt) {
1008 case IP6OPT_PAD1:
1009 optlen = 1;
1010 break;
1011 case IP6OPT_PADN:
1012 if (hbhlen < IP6OPT_MINLEN) {
1013 IP6STAT_INC(ip6s_toosmall);
1014 goto bad;
1015 }
1016 optlen = *(opt + 1) + 2;
1017 break;
1018 case IP6OPT_ROUTER_ALERT:
1019 /* XXX may need check for alignment */
1020 if (hbhlen < IP6OPT_RTALERT_LEN) {
1021 IP6STAT_INC(ip6s_toosmall);
1022 goto bad;
1023 }
1024 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
1025 /* XXX stat */
1026 icmp6_error(m, ICMP6_PARAM_PROB,
1027 ICMP6_PARAMPROB_HEADER,
1028 erroff + opt + 1 - opthead);
1029 return (-1);
1030 }
1031 optlen = IP6OPT_RTALERT_LEN;
1032 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
1033 *rtalertp = ntohs(rtalert_val);
1034 break;
1035 case IP6OPT_JUMBO:
1036 /* We do not support the Jumbo Payload option. */
1037 goto bad;
1038 default: /* unknown option */
1039 if (hbhlen < IP6OPT_MINLEN) {
1040 IP6STAT_INC(ip6s_toosmall);
1041 goto bad;
1042 }
1043 optlen = ip6_unknown_opt(opt, m,
1044 erroff + opt - opthead);
1045 if (optlen == -1)
1046 return (-1);
1047 optlen += 2;
1048 break;
1049 }
1050 }
1051
1052 return (0);
1053
1054 bad:
1055 m_freem(m);
1056 return (-1);
1057 }
1058
1059 /*
1060 * Unknown option processing.
1061 * The third argument `off' is the offset from the IPv6 header to the option,
1062 * which is necessary if the IPv6 header the and option header and IPv6 header
1063 * is not contiguous in order to return an ICMPv6 error.
1064 */
1065 int
ip6_unknown_opt(u_int8_t * optp,struct mbuf * m,int off)1066 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
1067 {
1068 struct ip6_hdr *ip6;
1069
1070 switch (IP6OPT_TYPE(*optp)) {
1071 case IP6OPT_TYPE_SKIP: /* ignore the option */
1072 return ((int)*(optp + 1));
1073 case IP6OPT_TYPE_DISCARD: /* silently discard */
1074 m_freem(m);
1075 return (-1);
1076 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
1077 IP6STAT_INC(ip6s_badoptions);
1078 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
1079 return (-1);
1080 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
1081 IP6STAT_INC(ip6s_badoptions);
1082 ip6 = mtod(m, struct ip6_hdr *);
1083 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
1084 (m->m_flags & (M_BCAST|M_MCAST)))
1085 m_freem(m);
1086 else
1087 icmp6_error(m, ICMP6_PARAM_PROB,
1088 ICMP6_PARAMPROB_OPTION, off);
1089 return (-1);
1090 }
1091
1092 m_freem(m); /* XXX: NOTREACHED */
1093 return (-1);
1094 }
1095
1096 /*
1097 * Create the "control" list for this pcb.
1098 * These functions will not modify mbuf chain at all.
1099 *
1100 * The routine will be called from upper layer handlers like tcp6_input().
1101 * Thus the routine assumes that the caller (tcp6_input) have already
1102 * called m_pullup() and all the extension headers are located in the
1103 * very first mbuf on the mbuf chain.
1104 *
1105 * ip6_savecontrol_v4 will handle those options that are possible to be
1106 * set on a v4-mapped socket.
1107 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those
1108 * options and handle the v6-only ones itself.
1109 */
1110 struct mbuf **
ip6_savecontrol_v4(struct inpcb * inp,struct mbuf * m,struct mbuf ** mp,int * v4only)1111 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp,
1112 int *v4only)
1113 {
1114 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1115
1116 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME)
1117 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) {
1118 union {
1119 struct timeval tv;
1120 struct bintime bt;
1121 struct timespec ts;
1122 } t;
1123 struct bintime boottimebin, bt1;
1124 struct timespec ts1;
1125 int ts_clock;
1126 bool stamped;
1127
1128 ts_clock = inp->inp_socket->so_ts_clock;
1129 stamped = false;
1130
1131 /*
1132 * Handle BINTIME first. We create the same output options
1133 * for both SO_BINTIME and the case where SO_TIMESTAMP is
1134 * set with the timestamp clock set to SO_TS_BINTIME.
1135 */
1136 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 ||
1137 ts_clock == SO_TS_BINTIME) {
1138 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1139 M_TSTMP)) {
1140 mbuf_tstmp2timespec(m, &ts1);
1141 timespec2bintime(&ts1, &t.bt);
1142 getboottimebin(&boottimebin);
1143 bintime_add(&t.bt, &boottimebin);
1144 } else {
1145 bintime(&t.bt);
1146 }
1147 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME,
1148 SOL_SOCKET, M_NOWAIT);
1149 if (*mp != NULL) {
1150 mp = &(*mp)->m_next;
1151 stamped = true;
1152 }
1153
1154 /*
1155 * Suppress other timestamps if SO_TIMESTAMP is not
1156 * set.
1157 */
1158 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0)
1159 ts_clock = SO_TS_BINTIME;
1160 }
1161
1162 switch (ts_clock) {
1163 case SO_TS_REALTIME_MICRO:
1164 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1165 M_TSTMP)) {
1166 mbuf_tstmp2timespec(m, &ts1);
1167 timespec2bintime(&ts1, &bt1);
1168 getboottimebin(&boottimebin);
1169 bintime_add(&bt1, &boottimebin);
1170 bintime2timeval(&bt1, &t.tv);
1171 } else {
1172 microtime(&t.tv);
1173 }
1174 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv),
1175 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT);
1176 if (*mp != NULL) {
1177 mp = &(*mp)->m_next;
1178 stamped = true;
1179 }
1180 break;
1181
1182 case SO_TS_BINTIME:
1183 break;
1184
1185 case SO_TS_REALTIME:
1186 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1187 M_TSTMP)) {
1188 mbuf_tstmp2timespec(m, &t.ts);
1189 getboottimebin(&boottimebin);
1190 bintime2timespec(&boottimebin, &ts1);
1191 timespecadd(&t.ts, &ts1, &t.ts);
1192 } else {
1193 nanotime(&t.ts);
1194 }
1195 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts),
1196 SCM_REALTIME, SOL_SOCKET, M_NOWAIT);
1197 if (*mp != NULL) {
1198 mp = &(*mp)->m_next;
1199 stamped = true;
1200 }
1201 break;
1202
1203 case SO_TS_MONOTONIC:
1204 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1205 M_TSTMP))
1206 mbuf_tstmp2timespec(m, &t.ts);
1207 else
1208 nanouptime(&t.ts);
1209 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts),
1210 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT);
1211 if (*mp != NULL) {
1212 mp = &(*mp)->m_next;
1213 stamped = true;
1214 }
1215 break;
1216
1217 default:
1218 panic("unknown (corrupted) so_ts_clock");
1219 }
1220 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) ==
1221 (M_PKTHDR | M_TSTMP)) {
1222 struct sock_timestamp_info sti;
1223
1224 bzero(&sti, sizeof(sti));
1225 sti.st_info_flags = ST_INFO_HW;
1226 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1227 sti.st_info_flags |= ST_INFO_HW_HPREC;
1228 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO,
1229 SOL_SOCKET, M_NOWAIT);
1230 if (*mp != NULL)
1231 mp = &(*mp)->m_next;
1232 }
1233 }
1234 #endif
1235
1236 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y))
1237 /* RFC 2292 sec. 5 */
1238 if ((inp->inp_flags & IN6P_PKTINFO) != 0) {
1239 struct in6_pktinfo pi6;
1240
1241 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1242 #ifdef INET
1243 struct ip *ip;
1244
1245 ip = mtod(m, struct ip *);
1246 pi6.ipi6_addr.s6_addr32[0] = 0;
1247 pi6.ipi6_addr.s6_addr32[1] = 0;
1248 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
1249 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr;
1250 #else
1251 /* We won't hit this code */
1252 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr));
1253 #endif
1254 } else {
1255 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
1256 in6_clearscope(&pi6.ipi6_addr); /* XXX */
1257 }
1258 pi6.ipi6_ifindex =
1259 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0;
1260
1261 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo),
1262 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6,
1263 M_NOWAIT);
1264 if (*mp)
1265 mp = &(*mp)->m_next;
1266 }
1267
1268 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) {
1269 int hlim;
1270
1271 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1272 #ifdef INET
1273 struct ip *ip;
1274
1275 ip = mtod(m, struct ip *);
1276 hlim = ip->ip_ttl;
1277 #else
1278 /* We won't hit this code */
1279 hlim = 0;
1280 #endif
1281 } else {
1282 hlim = ip6->ip6_hlim & 0xff;
1283 }
1284 *mp = sbcreatecontrol(&hlim, sizeof(int),
1285 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT),
1286 IPPROTO_IPV6, M_NOWAIT);
1287 if (*mp)
1288 mp = &(*mp)->m_next;
1289 }
1290
1291 if ((inp->inp_flags & IN6P_TCLASS) != 0) {
1292 int tclass;
1293
1294 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1295 #ifdef INET
1296 struct ip *ip;
1297
1298 ip = mtod(m, struct ip *);
1299 tclass = ip->ip_tos;
1300 #else
1301 /* We won't hit this code */
1302 tclass = 0;
1303 #endif
1304 } else {
1305 u_int32_t flowinfo;
1306
1307 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
1308 flowinfo >>= 20;
1309 tclass = flowinfo & 0xff;
1310 }
1311 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS,
1312 IPPROTO_IPV6, M_NOWAIT);
1313 if (*mp)
1314 mp = &(*mp)->m_next;
1315 }
1316
1317 if (v4only != NULL) {
1318 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
1319 *v4only = 1;
1320 } else {
1321 *v4only = 0;
1322 }
1323 }
1324
1325 return (mp);
1326 }
1327
1328 void
ip6_savecontrol(struct inpcb * inp,struct mbuf * m,struct mbuf ** mp)1329 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp)
1330 {
1331 struct ip6_hdr *ip6;
1332 int v4only = 0;
1333
1334 mp = ip6_savecontrol_v4(inp, m, mp, &v4only);
1335 if (v4only)
1336 return;
1337
1338 ip6 = mtod(m, struct ip6_hdr *);
1339 /*
1340 * IPV6_HOPOPTS socket option. Recall that we required super-user
1341 * privilege for the option (see ip6_ctloutput), but it might be too
1342 * strict, since there might be some hop-by-hop options which can be
1343 * returned to normal user.
1344 * See also RFC 2292 section 6 (or RFC 3542 section 8).
1345 */
1346 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) {
1347 /*
1348 * Check if a hop-by-hop options header is contatined in the
1349 * received packet, and if so, store the options as ancillary
1350 * data. Note that a hop-by-hop options header must be
1351 * just after the IPv6 header, which is assured through the
1352 * IPv6 input processing.
1353 */
1354 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
1355 struct ip6_hbh *hbh;
1356 u_int hbhlen;
1357
1358 hbh = (struct ip6_hbh *)(ip6 + 1);
1359 hbhlen = (hbh->ip6h_len + 1) << 3;
1360
1361 /*
1362 * XXX: We copy the whole header even if a
1363 * jumbo payload option is included, the option which
1364 * is to be removed before returning according to
1365 * RFC2292.
1366 * Note: this constraint is removed in RFC3542
1367 */
1368 *mp = sbcreatecontrol(hbh, hbhlen,
1369 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS),
1370 IPPROTO_IPV6, M_NOWAIT);
1371 if (*mp)
1372 mp = &(*mp)->m_next;
1373 }
1374 }
1375
1376 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) {
1377 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr);
1378
1379 /*
1380 * Search for destination options headers or routing
1381 * header(s) through the header chain, and stores each
1382 * header as ancillary data.
1383 * Note that the order of the headers remains in
1384 * the chain of ancillary data.
1385 */
1386 while (1) { /* is explicit loop prevention necessary? */
1387 struct ip6_ext *ip6e = NULL;
1388 u_int elen;
1389
1390 /*
1391 * if it is not an extension header, don't try to
1392 * pull it from the chain.
1393 */
1394 switch (nxt) {
1395 case IPPROTO_DSTOPTS:
1396 case IPPROTO_ROUTING:
1397 case IPPROTO_HOPOPTS:
1398 case IPPROTO_AH: /* is it possible? */
1399 break;
1400 default:
1401 goto loopend;
1402 }
1403
1404 if (off + sizeof(*ip6e) > m->m_len)
1405 goto loopend;
1406 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
1407 if (nxt == IPPROTO_AH)
1408 elen = (ip6e->ip6e_len + 2) << 2;
1409 else
1410 elen = (ip6e->ip6e_len + 1) << 3;
1411 if (off + elen > m->m_len)
1412 goto loopend;
1413
1414 switch (nxt) {
1415 case IPPROTO_DSTOPTS:
1416 if (!(inp->inp_flags & IN6P_DSTOPTS))
1417 break;
1418
1419 *mp = sbcreatecontrol(ip6e, elen,
1420 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS),
1421 IPPROTO_IPV6, M_NOWAIT);
1422 if (*mp)
1423 mp = &(*mp)->m_next;
1424 break;
1425 case IPPROTO_ROUTING:
1426 if (!(inp->inp_flags & IN6P_RTHDR))
1427 break;
1428
1429 *mp = sbcreatecontrol(ip6e, elen,
1430 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR),
1431 IPPROTO_IPV6, M_NOWAIT);
1432 if (*mp)
1433 mp = &(*mp)->m_next;
1434 break;
1435 case IPPROTO_HOPOPTS:
1436 case IPPROTO_AH: /* is it possible? */
1437 break;
1438
1439 default:
1440 /*
1441 * other cases have been filtered in the above.
1442 * none will visit this case. here we supply
1443 * the code just in case (nxt overwritten or
1444 * other cases).
1445 */
1446 goto loopend;
1447 }
1448
1449 /* proceed with the next header. */
1450 off += elen;
1451 nxt = ip6e->ip6e_nxt;
1452 ip6e = NULL;
1453 }
1454 loopend:
1455 ;
1456 }
1457
1458 if (inp->inp_flags2 & INP_RECVFLOWID) {
1459 uint32_t flowid, flow_type;
1460
1461 flowid = m->m_pkthdr.flowid;
1462 flow_type = M_HASHTYPE_GET(m);
1463
1464 /*
1465 * XXX should handle the failure of one or the
1466 * other - don't populate both?
1467 */
1468 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID,
1469 IPPROTO_IPV6, M_NOWAIT);
1470 if (*mp)
1471 mp = &(*mp)->m_next;
1472 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t),
1473 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT);
1474 if (*mp)
1475 mp = &(*mp)->m_next;
1476 }
1477
1478 #ifdef RSS
1479 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1480 uint32_t flowid, flow_type;
1481 uint32_t rss_bucketid;
1482
1483 flowid = m->m_pkthdr.flowid;
1484 flow_type = M_HASHTYPE_GET(m);
1485
1486 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1487 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t),
1488 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT);
1489 if (*mp)
1490 mp = &(*mp)->m_next;
1491 }
1492 }
1493 #endif
1494
1495 }
1496 #undef IS2292
1497
1498 void
ip6_notify_pmtu(struct inpcb * inp,struct sockaddr_in6 * dst,u_int32_t mtu)1499 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu)
1500 {
1501 struct socket *so;
1502 struct mbuf *m_mtu;
1503 struct ip6_mtuinfo mtuctl;
1504
1505 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
1506 /*
1507 * Notify the error by sending IPV6_PATHMTU ancillary data if
1508 * application wanted to know the MTU value.
1509 * NOTE: we notify disconnected sockets, because some udp
1510 * applications keep sending sockets disconnected.
1511 * NOTE: our implementation doesn't notify connected sockets that has
1512 * foreign address that is different than given destination addresses
1513 * (this is permitted by RFC 3542).
1514 */
1515 if ((inp->inp_flags & IN6P_MTU) == 0 || (
1516 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1517 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr)))
1518 return;
1519
1520 mtuctl.ip6m_mtu = mtu;
1521 mtuctl.ip6m_addr = *dst;
1522 if (sa6_recoverscope(&mtuctl.ip6m_addr))
1523 return;
1524
1525 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU,
1526 IPPROTO_IPV6, M_NOWAIT)) == NULL)
1527 return;
1528
1529 so = inp->inp_socket;
1530 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu)
1531 == 0) {
1532 soroverflow(so);
1533 m_freem(m_mtu);
1534 /* XXX: should count statistics */
1535 } else
1536 sorwakeup(so);
1537 }
1538
1539 /*
1540 * Get pointer to the previous header followed by the header
1541 * currently processed.
1542 */
1543 int
ip6_get_prevhdr(const struct mbuf * m,int off)1544 ip6_get_prevhdr(const struct mbuf *m, int off)
1545 {
1546 struct ip6_ext ip6e;
1547 struct ip6_hdr *ip6;
1548 int len, nlen, nxt;
1549
1550 if (off == sizeof(struct ip6_hdr))
1551 return (offsetof(struct ip6_hdr, ip6_nxt));
1552 if (off < sizeof(struct ip6_hdr))
1553 panic("%s: off < sizeof(struct ip6_hdr)", __func__);
1554
1555 ip6 = mtod(m, struct ip6_hdr *);
1556 nxt = ip6->ip6_nxt;
1557 len = sizeof(struct ip6_hdr);
1558 nlen = 0;
1559 while (len < off) {
1560 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e);
1561 switch (nxt) {
1562 case IPPROTO_FRAGMENT:
1563 nlen = sizeof(struct ip6_frag);
1564 break;
1565 case IPPROTO_AH:
1566 nlen = (ip6e.ip6e_len + 2) << 2;
1567 break;
1568 default:
1569 nlen = (ip6e.ip6e_len + 1) << 3;
1570 }
1571 len += nlen;
1572 nxt = ip6e.ip6e_nxt;
1573 }
1574 return (len - nlen);
1575 }
1576
1577 /*
1578 * get next header offset. m will be retained.
1579 */
1580 int
ip6_nexthdr(const struct mbuf * m,int off,int proto,int * nxtp)1581 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1582 {
1583 struct ip6_hdr ip6;
1584 struct ip6_ext ip6e;
1585 struct ip6_frag fh;
1586
1587 /* just in case */
1588 if (m == NULL)
1589 panic("ip6_nexthdr: m == NULL");
1590 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
1591 return -1;
1592
1593 switch (proto) {
1594 case IPPROTO_IPV6:
1595 if (m->m_pkthdr.len < off + sizeof(ip6))
1596 return -1;
1597 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6);
1598 if (nxtp)
1599 *nxtp = ip6.ip6_nxt;
1600 off += sizeof(ip6);
1601 return off;
1602
1603 case IPPROTO_FRAGMENT:
1604 /*
1605 * terminate parsing if it is not the first fragment,
1606 * it does not make sense to parse through it.
1607 */
1608 if (m->m_pkthdr.len < off + sizeof(fh))
1609 return -1;
1610 m_copydata(m, off, sizeof(fh), (caddr_t)&fh);
1611 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */
1612 if (fh.ip6f_offlg & IP6F_OFF_MASK)
1613 return -1;
1614 if (nxtp)
1615 *nxtp = fh.ip6f_nxt;
1616 off += sizeof(struct ip6_frag);
1617 return off;
1618
1619 case IPPROTO_AH:
1620 if (m->m_pkthdr.len < off + sizeof(ip6e))
1621 return -1;
1622 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1623 if (nxtp)
1624 *nxtp = ip6e.ip6e_nxt;
1625 off += (ip6e.ip6e_len + 2) << 2;
1626 return off;
1627
1628 case IPPROTO_HOPOPTS:
1629 case IPPROTO_ROUTING:
1630 case IPPROTO_DSTOPTS:
1631 if (m->m_pkthdr.len < off + sizeof(ip6e))
1632 return -1;
1633 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e);
1634 if (nxtp)
1635 *nxtp = ip6e.ip6e_nxt;
1636 off += (ip6e.ip6e_len + 1) << 3;
1637 return off;
1638
1639 case IPPROTO_NONE:
1640 case IPPROTO_ESP:
1641 case IPPROTO_IPCOMP:
1642 /* give up */
1643 return -1;
1644
1645 default:
1646 return -1;
1647 }
1648
1649 /* NOTREACHED */
1650 }
1651
1652 /*
1653 * get offset for the last header in the chain. m will be kept untainted.
1654 */
1655 int
ip6_lasthdr(const struct mbuf * m,int off,int proto,int * nxtp)1656 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp)
1657 {
1658 int newoff;
1659 int nxt;
1660
1661 if (!nxtp) {
1662 nxt = -1;
1663 nxtp = &nxt;
1664 }
1665 while (1) {
1666 newoff = ip6_nexthdr(m, off, proto, nxtp);
1667 if (newoff < 0)
1668 return off;
1669 else if (newoff < off)
1670 return -1; /* invalid */
1671 else if (newoff == off)
1672 return newoff;
1673
1674 off = newoff;
1675 proto = *nxtp;
1676 }
1677 }
1678