1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 /*
26 * iptun - IP Tunneling Driver
27 *
28 * This module is a GLDv3 driver that implements virtual datalinks over IP
29 * (a.k.a, IP tunneling). The datalinks are managed through a dld ioctl
30 * interface (see iptun_ctl.c), and registered with GLDv3 using
31 * mac_register(). It implements the logic for various forms of IP (IPv4 or
32 * IPv6) encapsulation within IP (IPv4 or IPv6) by interacting with the ip
33 * module below it. Each virtual IP tunnel datalink has a conn_t associated
34 * with it representing the "outer" IP connection.
35 *
36 * The module implements the following locking semantics:
37 *
38 * Lookups and deletions in iptun_hash are synchronized using iptun_hash_lock.
39 * See comments above iptun_hash_lock for details.
40 *
41 * No locks are ever held while calling up to GLDv3. The general architecture
42 * of GLDv3 requires this, as the mac perimeter (essentially a lock) for a
43 * given link will be held while making downcalls (iptun_m_*() callbacks).
44 * Because we need to hold locks while handling downcalls, holding these locks
45 * while issuing upcalls results in deadlock scenarios. See the block comment
46 * above iptun_task_cb() for details on how we safely issue upcalls without
47 * holding any locks.
48 *
49 * The contents of each iptun_t is protected by an iptun_mutex which is held
50 * in iptun_enter() (called by iptun_enter_by_linkid()), and exited in
51 * iptun_exit().
52 *
53 * See comments in iptun_delete() and iptun_free() for details on how the
54 * iptun_t is deleted safely.
55 */
56
57 #include <sys/types.h>
58 #include <sys/kmem.h>
59 #include <sys/errno.h>
60 #include <sys/modhash.h>
61 #include <sys/list.h>
62 #include <sys/strsun.h>
63 #include <sys/file.h>
64 #include <sys/systm.h>
65 #include <sys/tihdr.h>
66 #include <sys/param.h>
67 #include <sys/mac_provider.h>
68 #include <sys/mac_ipv4.h>
69 #include <sys/mac_ipv6.h>
70 #include <sys/mac_6to4.h>
71 #include <sys/tsol/tnet.h>
72 #include <sys/sunldi.h>
73 #include <netinet/in.h>
74 #include <netinet/ip6.h>
75 #include <inet/ip.h>
76 #include <inet/ip_ire.h>
77 #include <inet/ipsec_impl.h>
78 #include <sys/tsol/label.h>
79 #include <sys/tsol/tnet.h>
80 #include <inet/iptun.h>
81 #include "iptun_impl.h"
82
83 /* Do the tunnel type and address family match? */
84 #define IPTUN_ADDR_MATCH(iptun_type, family) \
85 ((iptun_type == IPTUN_TYPE_IPV4 && family == AF_INET) || \
86 (iptun_type == IPTUN_TYPE_IPV6 && family == AF_INET6) || \
87 (iptun_type == IPTUN_TYPE_6TO4 && family == AF_INET))
88
89 #define IPTUN_HASH_KEY(key) ((mod_hash_key_t)(uintptr_t)(key))
90
91 #define IPTUN_MIN_IPV4_MTU 576 /* ip.h still uses 68 (!) */
92 #define IPTUN_MIN_IPV6_MTU IPV6_MIN_MTU
93 #define IPTUN_MAX_IPV4_MTU (IP_MAXPACKET - sizeof (ipha_t))
94 #define IPTUN_MAX_IPV6_MTU (IP_MAXPACKET - sizeof (ip6_t) - \
95 sizeof (iptun_encaplim_t))
96
97 #define IPTUN_MIN_HOPLIMIT 1
98 #define IPTUN_MAX_HOPLIMIT UINT8_MAX
99
100 #define IPTUN_MIN_ENCAPLIMIT 0
101 #define IPTUN_MAX_ENCAPLIMIT UINT8_MAX
102
103 #define IPTUN_IPSEC_REQ_MASK (IPSEC_PREF_REQUIRED | IPSEC_PREF_NEVER)
104
105 static iptun_encaplim_t iptun_encaplim_init = {
106 { IPPROTO_NONE, 0 },
107 { IP6OPT_TUNNEL_LIMIT,
108 1,
109 IPTUN_DEFAULT_ENCAPLIMIT }, /* filled in with actual value later */
110 { IP6OPT_PADN,
111 1,
112 0 }
113 };
114
115 /*
116 * Table containing per-iptun-type information.
117 * Since IPv6 can run over all of these we have the IPv6 min as the min MTU.
118 */
119 static iptun_typeinfo_t iptun_type_table[] = {
120 { IPTUN_TYPE_IPV4, MAC_PLUGIN_IDENT_IPV4, IPV4_VERSION,
121 IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU, B_TRUE },
122 { IPTUN_TYPE_IPV6, MAC_PLUGIN_IDENT_IPV6, IPV6_VERSION,
123 IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV6_MTU, B_TRUE },
124 { IPTUN_TYPE_6TO4, MAC_PLUGIN_IDENT_6TO4, IPV4_VERSION,
125 IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU, B_FALSE },
126 { IPTUN_TYPE_UNKNOWN, NULL, 0, 0, 0, B_FALSE }
127 };
128
129 /*
130 * iptun_hash is an iptun_t lookup table by link ID protected by
131 * iptun_hash_lock. While the hash table's integrity is maintained via
132 * internal locking in the mod_hash_*() functions, we need additional locking
133 * so that an iptun_t cannot be deleted after a hash lookup has returned an
134 * iptun_t and before iptun_lock has been entered. As such, we use
135 * iptun_hash_lock when doing lookups and removals from iptun_hash.
136 */
137 mod_hash_t *iptun_hash;
138 static kmutex_t iptun_hash_lock;
139
140 static uint_t iptun_tunnelcount; /* total for all stacks */
141 kmem_cache_t *iptun_cache;
142 ddi_taskq_t *iptun_taskq;
143
144 typedef enum {
145 IPTUN_TASK_MTU_UPDATE, /* tell mac about new tunnel link MTU */
146 IPTUN_TASK_LADDR_UPDATE, /* tell mac about new local address */
147 IPTUN_TASK_RADDR_UPDATE, /* tell mac about new remote address */
148 IPTUN_TASK_LINK_UPDATE, /* tell mac about new link state */
149 IPTUN_TASK_PDATA_UPDATE /* tell mac about updated plugin data */
150 } iptun_task_t;
151
152 typedef struct iptun_task_data_s {
153 iptun_task_t itd_task;
154 datalink_id_t itd_linkid;
155 } iptun_task_data_t;
156
157 static void iptun_task_dispatch(iptun_t *, iptun_task_t);
158 static int iptun_enter(iptun_t *);
159 static void iptun_exit(iptun_t *);
160 static void iptun_headergen(iptun_t *, boolean_t);
161 static void iptun_drop_pkt(mblk_t *, uint64_t *);
162 static void iptun_input(void *, mblk_t *, void *, ip_recv_attr_t *);
163 static void iptun_input_icmp(void *, mblk_t *, void *, ip_recv_attr_t *);
164 static void iptun_output(iptun_t *, mblk_t *);
165 static uint32_t iptun_get_maxmtu(iptun_t *, ip_xmit_attr_t *, uint32_t);
166 static uint32_t iptun_update_mtu(iptun_t *, ip_xmit_attr_t *, uint32_t);
167 static uint32_t iptun_get_dst_pmtu(iptun_t *, ip_xmit_attr_t *);
168 static void iptun_update_dst_pmtu(iptun_t *, ip_xmit_attr_t *);
169 static int iptun_setladdr(iptun_t *, const struct sockaddr_storage *);
170
171 static void iptun_output_6to4(iptun_t *, mblk_t *);
172 static void iptun_output_common(iptun_t *, ip_xmit_attr_t *, mblk_t *);
173 static boolean_t iptun_verifyicmp(conn_t *, void *, icmph_t *, icmp6_t *,
174 ip_recv_attr_t *);
175
176 static void iptun_notify(void *, ip_xmit_attr_t *, ixa_notify_type_t,
177 ixa_notify_arg_t);
178
179 static mac_callbacks_t iptun_m_callbacks;
180
181 static int
182 iptun_m_getstat(void *arg, uint_t stat, uint64_t *val)
183 {
184 iptun_t *iptun = arg;
185 int err = 0;
186
187 switch (stat) {
188 case MAC_STAT_IERRORS:
189 *val = iptun->iptun_ierrors;
190 break;
191 case MAC_STAT_OERRORS:
192 *val = iptun->iptun_oerrors;
193 break;
194 case MAC_STAT_RBYTES:
195 *val = iptun->iptun_rbytes;
196 break;
197 case MAC_STAT_IPACKETS:
198 *val = iptun->iptun_ipackets;
199 break;
200 case MAC_STAT_OBYTES:
201 *val = iptun->iptun_obytes;
202 break;
203 case MAC_STAT_OPACKETS:
204 *val = iptun->iptun_opackets;
205 break;
206 case MAC_STAT_NORCVBUF:
207 *val = iptun->iptun_norcvbuf;
208 break;
209 case MAC_STAT_NOXMTBUF:
210 *val = iptun->iptun_noxmtbuf;
211 break;
212 default:
213 err = ENOTSUP;
214 }
215
216 return (err);
217 }
218
219 static int
220 iptun_m_start(void *arg)
221 {
222 iptun_t *iptun = arg;
223 int err;
224
225 if ((err = iptun_enter(iptun)) == 0) {
226 iptun->iptun_flags |= IPTUN_MAC_STARTED;
227 iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE);
228 iptun_exit(iptun);
229 }
230 return (err);
231 }
232
233 static void
234 iptun_m_stop(void *arg)
235 {
236 iptun_t *iptun = arg;
237
238 if (iptun_enter(iptun) == 0) {
239 iptun->iptun_flags &= ~IPTUN_MAC_STARTED;
240 iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE);
241 iptun_exit(iptun);
242 }
243 }
244
245 /*
246 * iptun_m_setpromisc() does nothing and always succeeds. This is because a
247 * tunnel data-link only ever receives packets that are destined exclusively
248 * for the local address of the tunnel.
249 */
250 /* ARGSUSED */
251 static int
252 iptun_m_setpromisc(void *arg, boolean_t on)
253 {
254 return (0);
255 }
256
257 /* ARGSUSED */
258 static int
259 iptun_m_multicst(void *arg, boolean_t add, const uint8_t *addrp)
260 {
261 return (ENOTSUP);
262 }
263
264 /*
265 * iptun_m_unicst() sets the local address.
266 */
267 /* ARGSUSED */
268 static int
269 iptun_m_unicst(void *arg, const uint8_t *addrp)
270 {
271 iptun_t *iptun = arg;
272 int err;
273 struct sockaddr_storage ss;
274 struct sockaddr_in *sin;
275 struct sockaddr_in6 *sin6;
276
277 if ((err = iptun_enter(iptun)) == 0) {
278 switch (iptun->iptun_typeinfo->iti_ipvers) {
279 case IPV4_VERSION:
280 sin = (struct sockaddr_in *)&ss;
281 sin->sin_family = AF_INET;
282 bcopy(addrp, &sin->sin_addr, sizeof (in_addr_t));
283 break;
284 case IPV6_VERSION:
285 sin6 = (struct sockaddr_in6 *)&ss;
286 sin6->sin6_family = AF_INET6;
287 bcopy(addrp, &sin6->sin6_addr, sizeof (in6_addr_t));
288 break;
289 default:
290 ASSERT(0);
291 }
292 err = iptun_setladdr(iptun, &ss);
293 iptun_exit(iptun);
294 }
295 return (err);
296 }
297
298 static mblk_t *
299 iptun_m_tx(void *arg, mblk_t *mpchain)
300 {
301 mblk_t *mp, *nmp;
302 iptun_t *iptun = arg;
303
304 if (!IS_IPTUN_RUNNING(iptun)) {
305 iptun_drop_pkt(mpchain, &iptun->iptun_noxmtbuf);
306 return (NULL);
307 }
308
309 for (mp = mpchain; mp != NULL; mp = nmp) {
310 nmp = mp->b_next;
311 mp->b_next = NULL;
312 iptun_output(iptun, mp);
313 }
314
315 return (NULL);
316 }
317
318 /* ARGSUSED */
319 static int
320 iptun_m_setprop(void *barg, const char *pr_name, mac_prop_id_t pr_num,
321 uint_t pr_valsize, const void *pr_val)
322 {
323 iptun_t *iptun = barg;
324 uint32_t value = *(uint32_t *)pr_val;
325 int err;
326
327 /*
328 * We need to enter this iptun_t since we'll be modifying the outer
329 * header.
330 */
331 if ((err = iptun_enter(iptun)) != 0)
332 return (err);
333
334 switch (pr_num) {
335 case MAC_PROP_IPTUN_HOPLIMIT:
336 if (value < IPTUN_MIN_HOPLIMIT || value > IPTUN_MAX_HOPLIMIT) {
337 err = EINVAL;
338 break;
339 }
340 if (value != iptun->iptun_hoplimit) {
341 iptun->iptun_hoplimit = (uint8_t)value;
342 iptun_headergen(iptun, B_TRUE);
343 }
344 break;
345 case MAC_PROP_IPTUN_ENCAPLIMIT:
346 if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_IPV6 ||
347 value > IPTUN_MAX_ENCAPLIMIT) {
348 err = EINVAL;
349 break;
350 }
351 if (value != iptun->iptun_encaplimit) {
352 iptun->iptun_encaplimit = (uint8_t)value;
353 iptun_headergen(iptun, B_TRUE);
354 }
355 break;
356 case MAC_PROP_MTU: {
357 uint32_t maxmtu = iptun_get_maxmtu(iptun, NULL, 0);
358
359 if (value < iptun->iptun_typeinfo->iti_minmtu ||
360 value > maxmtu) {
361 err = EINVAL;
362 break;
363 }
364 iptun->iptun_flags |= IPTUN_FIXED_MTU;
365 if (value != iptun->iptun_mtu) {
366 iptun->iptun_mtu = value;
367 iptun_task_dispatch(iptun, IPTUN_TASK_MTU_UPDATE);
368 }
369 break;
370 }
371 default:
372 err = EINVAL;
373 }
374 iptun_exit(iptun);
375 return (err);
376 }
377
378 /* ARGSUSED */
379 static int
380 iptun_m_getprop(void *barg, const char *pr_name, mac_prop_id_t pr_num,
381 uint_t pr_valsize, void *pr_val)
382 {
383 iptun_t *iptun = barg;
384 int err;
385
386 if ((err = iptun_enter(iptun)) != 0)
387 return (err);
388
389 switch (pr_num) {
390 case MAC_PROP_IPTUN_HOPLIMIT:
391 ASSERT(pr_valsize >= sizeof (uint32_t));
392 *(uint32_t *)pr_val = iptun->iptun_hoplimit;
393 break;
394
395 case MAC_PROP_IPTUN_ENCAPLIMIT:
396 *(uint32_t *)pr_val = iptun->iptun_encaplimit;
397 break;
398 default:
399 err = ENOTSUP;
400 }
401 done:
402 iptun_exit(iptun);
403 return (err);
404 }
405
406 /* ARGSUSED */
407 static void
408 iptun_m_propinfo(void *barg, const char *pr_name, mac_prop_id_t pr_num,
409 mac_prop_info_handle_t prh)
410 {
411 iptun_t *iptun = barg;
412
413 switch (pr_num) {
414 case MAC_PROP_IPTUN_HOPLIMIT:
415 mac_prop_info_set_range_uint32(prh,
416 IPTUN_MIN_HOPLIMIT, IPTUN_MAX_HOPLIMIT);
417 mac_prop_info_set_default_uint32(prh, IPTUN_DEFAULT_HOPLIMIT);
418 break;
419
420 case MAC_PROP_IPTUN_ENCAPLIMIT:
421 if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_IPV6)
422 break;
423 mac_prop_info_set_range_uint32(prh,
424 IPTUN_MIN_ENCAPLIMIT, IPTUN_MAX_ENCAPLIMIT);
425 mac_prop_info_set_default_uint32(prh, IPTUN_DEFAULT_ENCAPLIMIT);
426 break;
427 case MAC_PROP_MTU:
428 mac_prop_info_set_range_uint32(prh,
429 iptun->iptun_typeinfo->iti_minmtu,
430 iptun_get_maxmtu(iptun, NULL, 0));
431 break;
432 }
433 }
434
435 uint_t
436 iptun_count(void)
437 {
438 return (iptun_tunnelcount);
439 }
440
441 /*
442 * Enter an iptun_t exclusively. This is essentially just a mutex, but we
443 * don't allow iptun_enter() to succeed on a tunnel if it's in the process of
444 * being deleted.
445 */
446 static int
447 iptun_enter(iptun_t *iptun)
448 {
449 mutex_enter(&iptun->iptun_lock);
450 while (iptun->iptun_flags & IPTUN_DELETE_PENDING)
451 cv_wait(&iptun->iptun_enter_cv, &iptun->iptun_lock);
452 if (iptun->iptun_flags & IPTUN_CONDEMNED) {
453 mutex_exit(&iptun->iptun_lock);
454 return (ENOENT);
455 }
456 return (0);
457 }
458
459 /*
460 * Exit the tunnel entered in iptun_enter().
461 */
462 static void
463 iptun_exit(iptun_t *iptun)
464 {
465 mutex_exit(&iptun->iptun_lock);
466 }
467
468 /*
469 * Enter the IP tunnel instance by datalink ID.
470 */
471 static int
472 iptun_enter_by_linkid(datalink_id_t linkid, iptun_t **iptun)
473 {
474 int err;
475
476 mutex_enter(&iptun_hash_lock);
477 if (mod_hash_find(iptun_hash, IPTUN_HASH_KEY(linkid),
478 (mod_hash_val_t *)iptun) == 0)
479 err = iptun_enter(*iptun);
480 else
481 err = ENOENT;
482 if (err != 0)
483 *iptun = NULL;
484 mutex_exit(&iptun_hash_lock);
485 return (err);
486 }
487
488 /*
489 * Handle tasks that were deferred through the iptun_taskq because they require
490 * calling up to the mac module, and we can't call up to the mac module while
491 * holding locks.
492 *
493 * This is tricky to get right without introducing race conditions and
494 * deadlocks with the mac module, as we cannot issue an upcall while in the
495 * iptun_t. The reason is that upcalls may try and enter the mac perimeter,
496 * while iptun callbacks (such as iptun_m_setprop()) called from the mac
497 * module will already have the perimeter held, and will then try and enter
498 * the iptun_t. You can see the lock ordering problem with this; this will
499 * deadlock.
500 *
501 * The safe way to do this is to enter the iptun_t in question and copy the
502 * information we need out of it so that we can exit it and know that the
503 * information being passed up to the upcalls won't be subject to modification
504 * by other threads. The problem now is that we need to exit it prior to
505 * issuing the upcall, but once we do this, a thread could come along and
506 * delete the iptun_t and thus the mac handle required to issue the upcall.
507 * To prevent this, we set the IPTUN_UPCALL_PENDING flag prior to exiting the
508 * iptun_t. This flag is the condition associated with iptun_upcall_cv, which
509 * iptun_delete() will cv_wait() on. When the upcall completes, we clear
510 * IPTUN_UPCALL_PENDING and cv_signal() any potentially waiting
511 * iptun_delete(). We can thus still safely use iptun->iptun_mh after having
512 * exited the iptun_t.
513 */
514 static void
515 iptun_task_cb(void *arg)
516 {
517 iptun_task_data_t *itd = arg;
518 iptun_task_t task = itd->itd_task;
519 datalink_id_t linkid = itd->itd_linkid;
520 iptun_t *iptun;
521 uint32_t mtu;
522 iptun_addr_t addr;
523 link_state_t linkstate;
524 size_t header_size;
525 iptun_header_t header;
526
527 kmem_free(itd, sizeof (*itd));
528
529 /*
530 * Note that if the lookup fails, it's because the tunnel was deleted
531 * between the time the task was dispatched and now. That isn't an
532 * error.
533 */
534 if (iptun_enter_by_linkid(linkid, &iptun) != 0)
535 return;
536
537 iptun->iptun_flags |= IPTUN_UPCALL_PENDING;
538
539 switch (task) {
540 case IPTUN_TASK_MTU_UPDATE:
541 mtu = iptun->iptun_mtu;
542 break;
543 case IPTUN_TASK_LADDR_UPDATE:
544 addr = iptun->iptun_laddr;
545 break;
546 case IPTUN_TASK_RADDR_UPDATE:
547 addr = iptun->iptun_raddr;
548 break;
549 case IPTUN_TASK_LINK_UPDATE:
550 linkstate = IS_IPTUN_RUNNING(iptun) ?
551 LINK_STATE_UP : LINK_STATE_DOWN;
552 break;
553 case IPTUN_TASK_PDATA_UPDATE:
554 header_size = iptun->iptun_header_size;
555 header = iptun->iptun_header;
556 break;
557 default:
558 ASSERT(0);
559 }
560
561 iptun_exit(iptun);
562
563 switch (task) {
564 case IPTUN_TASK_MTU_UPDATE:
565 (void) mac_maxsdu_update(iptun->iptun_mh, mtu);
566 break;
567 case IPTUN_TASK_LADDR_UPDATE:
568 mac_unicst_update(iptun->iptun_mh, (uint8_t *)&addr.ia_addr);
569 break;
570 case IPTUN_TASK_RADDR_UPDATE:
571 mac_dst_update(iptun->iptun_mh, (uint8_t *)&addr.ia_addr);
572 break;
573 case IPTUN_TASK_LINK_UPDATE:
574 mac_link_update(iptun->iptun_mh, linkstate);
575 break;
576 case IPTUN_TASK_PDATA_UPDATE:
577 if (mac_pdata_update(iptun->iptun_mh,
578 header_size == 0 ? NULL : &header, header_size) != 0)
579 atomic_inc_64(&iptun->iptun_taskq_fail);
580 break;
581 }
582
583 mutex_enter(&iptun->iptun_lock);
584 iptun->iptun_flags &= ~IPTUN_UPCALL_PENDING;
585 cv_signal(&iptun->iptun_upcall_cv);
586 mutex_exit(&iptun->iptun_lock);
587 }
588
589 static void
590 iptun_task_dispatch(iptun_t *iptun, iptun_task_t iptun_task)
591 {
592 iptun_task_data_t *itd;
593
594 itd = kmem_alloc(sizeof (*itd), KM_NOSLEEP);
595 if (itd == NULL) {
596 atomic_inc_64(&iptun->iptun_taskq_fail);
597 return;
598 }
599 itd->itd_task = iptun_task;
600 itd->itd_linkid = iptun->iptun_linkid;
601 if (ddi_taskq_dispatch(iptun_taskq, iptun_task_cb, itd, DDI_NOSLEEP)) {
602 atomic_inc_64(&iptun->iptun_taskq_fail);
603 kmem_free(itd, sizeof (*itd));
604 }
605 }
606
607 /*
608 * Convert an iptun_addr_t to sockaddr_storage.
609 */
610 static void
611 iptun_getaddr(iptun_addr_t *iptun_addr, struct sockaddr_storage *ss)
612 {
613 struct sockaddr_in *sin;
614 struct sockaddr_in6 *sin6;
615
616 bzero(ss, sizeof (*ss));
617 switch (iptun_addr->ia_family) {
618 case AF_INET:
619 sin = (struct sockaddr_in *)ss;
620 sin->sin_addr.s_addr = iptun_addr->ia_addr.iau_addr4;
621 break;
622 case AF_INET6:
623 sin6 = (struct sockaddr_in6 *)ss;
624 sin6->sin6_addr = iptun_addr->ia_addr.iau_addr6;
625 break;
626 default:
627 ASSERT(0);
628 }
629 ss->ss_family = iptun_addr->ia_family;
630 }
631
632 /*
633 * General purpose function to set an IP tunnel source or destination address.
634 */
635 static int
636 iptun_setaddr(iptun_type_t iptun_type, iptun_addr_t *iptun_addr,
637 const struct sockaddr_storage *ss)
638 {
639 if (!IPTUN_ADDR_MATCH(iptun_type, ss->ss_family))
640 return (EINVAL);
641
642 switch (ss->ss_family) {
643 case AF_INET: {
644 struct sockaddr_in *sin = (struct sockaddr_in *)ss;
645
646 if ((sin->sin_addr.s_addr == INADDR_ANY) ||
647 (sin->sin_addr.s_addr == INADDR_BROADCAST) ||
648 CLASSD(sin->sin_addr.s_addr)) {
649 return (EADDRNOTAVAIL);
650 }
651 iptun_addr->ia_addr.iau_addr4 = sin->sin_addr.s_addr;
652 break;
653 }
654 case AF_INET6: {
655 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ss;
656
657 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
658 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) ||
659 IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
660 return (EADDRNOTAVAIL);
661 }
662 iptun_addr->ia_addr.iau_addr6 = sin6->sin6_addr;
663 break;
664 }
665 default:
666 return (EAFNOSUPPORT);
667 }
668 iptun_addr->ia_family = ss->ss_family;
669 return (0);
670 }
671
672 static int
673 iptun_setladdr(iptun_t *iptun, const struct sockaddr_storage *laddr)
674 {
675 return (iptun_setaddr(iptun->iptun_typeinfo->iti_type,
676 &iptun->iptun_laddr, laddr));
677 }
678
679 static int
680 iptun_setraddr(iptun_t *iptun, const struct sockaddr_storage *raddr)
681 {
682 if (!(iptun->iptun_typeinfo->iti_hasraddr))
683 return (EINVAL);
684 return (iptun_setaddr(iptun->iptun_typeinfo->iti_type,
685 &iptun->iptun_raddr, raddr));
686 }
687
688 static boolean_t
689 iptun_canbind(iptun_t *iptun)
690 {
691 /*
692 * A tunnel may bind when its source address has been set, and if its
693 * tunnel type requires one, also its destination address.
694 */
695 return ((iptun->iptun_flags & IPTUN_LADDR) &&
696 ((iptun->iptun_flags & IPTUN_RADDR) ||
697 !(iptun->iptun_typeinfo->iti_hasraddr)));
698 }
699
700 /*
701 * Verify that the local address is valid, and insert in the fanout
702 */
703 static int
704 iptun_bind(iptun_t *iptun)
705 {
706 conn_t *connp = iptun->iptun_connp;
707 int error = 0;
708 ip_xmit_attr_t *ixa;
709 ip_xmit_attr_t *oldixa;
710 iulp_t uinfo;
711 ip_stack_t *ipst = connp->conn_netstack->netstack_ip;
712
713 /*
714 * Get an exclusive ixa for this thread.
715 * We defer updating conn_ixa until later to handle any concurrent
716 * conn_ixa_cleanup thread.
717 */
718 ixa = conn_get_ixa(connp, B_FALSE);
719 if (ixa == NULL)
720 return (ENOMEM);
721
722 /* We create PMTU state including for 6to4 */
723 ixa->ixa_flags |= IXAF_PMTU_DISCOVERY;
724
725 ASSERT(iptun_canbind(iptun));
726
727 mutex_enter(&connp->conn_lock);
728 /*
729 * Note that conn_proto can't be set since the upper protocol
730 * can be both 41 and 4 when IPv6 and IPv4 are over the same tunnel.
731 * ipcl_iptun_classify doesn't use conn_proto.
732 */
733 connp->conn_ipversion = iptun->iptun_typeinfo->iti_ipvers;
734
735 switch (iptun->iptun_typeinfo->iti_type) {
736 case IPTUN_TYPE_IPV4:
737 IN6_IPADDR_TO_V4MAPPED(iptun->iptun_laddr4,
738 &connp->conn_laddr_v6);
739 IN6_IPADDR_TO_V4MAPPED(iptun->iptun_raddr4,
740 &connp->conn_faddr_v6);
741 ixa->ixa_flags |= IXAF_IS_IPV4;
742 if (ip_laddr_verify_v4(iptun->iptun_laddr4, IPCL_ZONEID(connp),
743 ipst, B_FALSE) != IPVL_UNICAST_UP) {
744 mutex_exit(&connp->conn_lock);
745 error = EADDRNOTAVAIL;
746 goto done;
747 }
748 break;
749 case IPTUN_TYPE_IPV6:
750 connp->conn_laddr_v6 = iptun->iptun_laddr6;
751 connp->conn_faddr_v6 = iptun->iptun_raddr6;
752 ixa->ixa_flags &= ~IXAF_IS_IPV4;
753 /* We use a zero scopeid for now */
754 if (ip_laddr_verify_v6(&iptun->iptun_laddr6, IPCL_ZONEID(connp),
755 ipst, B_FALSE, 0) != IPVL_UNICAST_UP) {
756 mutex_exit(&connp->conn_lock);
757 error = EADDRNOTAVAIL;
758 goto done;
759 }
760 break;
761 case IPTUN_TYPE_6TO4:
762 IN6_IPADDR_TO_V4MAPPED(iptun->iptun_laddr4,
763 &connp->conn_laddr_v6);
764 IN6_IPADDR_TO_V4MAPPED(INADDR_ANY, &connp->conn_faddr_v6);
765 ixa->ixa_flags |= IXAF_IS_IPV4;
766 mutex_exit(&connp->conn_lock);
767
768 switch (ip_laddr_verify_v4(iptun->iptun_laddr4,
769 IPCL_ZONEID(connp), ipst, B_FALSE)) {
770 case IPVL_UNICAST_UP:
771 case IPVL_UNICAST_DOWN:
772 break;
773 default:
774 error = EADDRNOTAVAIL;
775 goto done;
776 }
777 goto insert;
778 }
779
780 /* In case previous destination was multirt */
781 ip_attr_newdst(ixa);
782
783 /*
784 * When we set a tunnel's destination address, we do not
785 * care if the destination is reachable. Transient routing
786 * issues should not inhibit the creation of a tunnel
787 * interface, for example. Thus we pass B_FALSE here.
788 */
789 connp->conn_saddr_v6 = connp->conn_laddr_v6;
790 mutex_exit(&connp->conn_lock);
791
792 /* As long as the MTU is large we avoid fragmentation */
793 ixa->ixa_flags |= IXAF_DONTFRAG | IXAF_PMTU_IPV4_DF;
794
795 /* We handle IPsec in iptun_output_common */
796 error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6,
797 &connp->conn_faddr_v6, &connp->conn_faddr_v6, 0,
798 &connp->conn_saddr_v6, &uinfo, 0);
799
800 if (error != 0)
801 goto done;
802
803 /* saddr shouldn't change since it was already set */
804 ASSERT(IN6_ARE_ADDR_EQUAL(&connp->conn_laddr_v6,
805 &connp->conn_saddr_v6));
806
807 /* We set IXAF_VERIFY_PMTU to catch PMTU increases */
808 ixa->ixa_flags |= IXAF_VERIFY_PMTU;
809 ASSERT(uinfo.iulp_mtu != 0);
810
811 /*
812 * Allow setting new policies.
813 * The addresses/ports are already set, thus the IPsec policy calls
814 * can handle their passed-in conn's.
815 */
816 connp->conn_policy_cached = B_FALSE;
817
818 insert:
819 error = ipcl_conn_insert(connp);
820 if (error != 0)
821 goto done;
822
823 /* Atomically update v6lastdst and conn_ixa */
824 mutex_enter(&connp->conn_lock);
825 /* Record this as the "last" send even though we haven't sent any */
826 connp->conn_v6lastdst = connp->conn_faddr_v6;
827
828 iptun->iptun_flags |= IPTUN_BOUND;
829
830 oldixa = conn_replace_ixa(connp, ixa);
831 /* Done with conn_t */
832 mutex_exit(&connp->conn_lock);
833 ixa_refrele(oldixa);
834
835 /*
836 * Now that we're bound with ip below us, this is a good
837 * time to initialize the destination path MTU and to
838 * re-calculate the tunnel's link MTU.
839 */
840 (void) iptun_update_mtu(iptun, ixa, 0);
841
842 if (IS_IPTUN_RUNNING(iptun))
843 iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE);
844
845 done:
846 ixa_refrele(ixa);
847 return (error);
848 }
849
850 static void
851 iptun_unbind(iptun_t *iptun)
852 {
853 ASSERT(iptun->iptun_flags & IPTUN_BOUND);
854 ASSERT(mutex_owned(&iptun->iptun_lock) ||
855 (iptun->iptun_flags & IPTUN_CONDEMNED));
856 ip_unbind(iptun->iptun_connp);
857 iptun->iptun_flags &= ~IPTUN_BOUND;
858 if (!(iptun->iptun_flags & IPTUN_CONDEMNED))
859 iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE);
860 }
861
862 /*
863 * Re-generate the template data-link header for a given IP tunnel given the
864 * tunnel's current parameters.
865 */
866 static void
867 iptun_headergen(iptun_t *iptun, boolean_t update_mac)
868 {
869 switch (iptun->iptun_typeinfo->iti_ipvers) {
870 case IPV4_VERSION:
871 /*
872 * We only need to use a custom IP header if the administrator
873 * has supplied a non-default hoplimit.
874 */
875 if (iptun->iptun_hoplimit == IPTUN_DEFAULT_HOPLIMIT) {
876 iptun->iptun_header_size = 0;
877 break;
878 }
879 iptun->iptun_header_size = sizeof (ipha_t);
880 iptun->iptun_header4.ipha_version_and_hdr_length =
881 IP_SIMPLE_HDR_VERSION;
882 iptun->iptun_header4.ipha_fragment_offset_and_flags =
883 htons(IPH_DF);
884 iptun->iptun_header4.ipha_ttl = iptun->iptun_hoplimit;
885 break;
886 case IPV6_VERSION: {
887 ip6_t *ip6hp = &iptun->iptun_header6.it6h_ip6h;
888
889 /*
890 * We only need to use a custom IPv6 header if either the
891 * administrator has supplied a non-default hoplimit, or we
892 * need to include an encapsulation limit option in the outer
893 * header.
894 */
895 if (iptun->iptun_hoplimit == IPTUN_DEFAULT_HOPLIMIT &&
896 iptun->iptun_encaplimit == 0) {
897 iptun->iptun_header_size = 0;
898 break;
899 }
900
901 (void) memset(ip6hp, 0, sizeof (*ip6hp));
902 if (iptun->iptun_encaplimit == 0) {
903 iptun->iptun_header_size = sizeof (ip6_t);
904 ip6hp->ip6_nxt = IPPROTO_NONE;
905 } else {
906 iptun_encaplim_t *iel;
907
908 iptun->iptun_header_size = sizeof (iptun_ipv6hdrs_t);
909 /*
910 * The mac_ipv6 plugin requires ip6_plen to be in host
911 * byte order and reflect the extension headers
912 * present in the template. The actual network byte
913 * order ip6_plen will be set on a per-packet basis on
914 * transmit.
915 */
916 ip6hp->ip6_plen = sizeof (*iel);
917 ip6hp->ip6_nxt = IPPROTO_DSTOPTS;
918 iel = &iptun->iptun_header6.it6h_encaplim;
919 *iel = iptun_encaplim_init;
920 iel->iel_telopt.ip6ot_encap_limit =
921 iptun->iptun_encaplimit;
922 }
923
924 ip6hp->ip6_hlim = iptun->iptun_hoplimit;
925 break;
926 }
927 }
928
929 if (update_mac)
930 iptun_task_dispatch(iptun, IPTUN_TASK_PDATA_UPDATE);
931 }
932
933 /*
934 * Insert inbound and outbound IPv4 and IPv6 policy into the given policy
935 * head.
936 */
937 static boolean_t
938 iptun_insert_simple_policies(ipsec_policy_head_t *ph, ipsec_act_t *actp,
939 uint_t n, netstack_t *ns)
940 {
941 int f = IPSEC_AF_V4;
942
943 if (!ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_INBOUND, ns) ||
944 !ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_OUTBOUND, ns))
945 return (B_FALSE);
946
947 f = IPSEC_AF_V6;
948 return (ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_INBOUND, ns) &&
949 ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_OUTBOUND, ns));
950 }
951
952 /*
953 * Used to set IPsec policy when policy is set through the IPTUN_CREATE or
954 * IPTUN_MODIFY ioctls.
955 */
956 static int
957 iptun_set_sec_simple(iptun_t *iptun, const ipsec_req_t *ipsr)
958 {
959 int rc = 0;
960 uint_t nact;
961 ipsec_act_t *actp = NULL;
962 boolean_t clear_all, old_policy = B_FALSE;
963 ipsec_tun_pol_t *itp;
964 char name[MAXLINKNAMELEN];
965 uint64_t gen;
966 netstack_t *ns = iptun->iptun_ns;
967
968 /* Can't specify self-encap on a tunnel. */
969 if (ipsr->ipsr_self_encap_req != 0)
970 return (EINVAL);
971
972 /*
973 * If it's a "clear-all" entry, unset the security flags and resume
974 * normal cleartext (or inherit-from-global) policy.
975 */
976 clear_all = ((ipsr->ipsr_ah_req & IPTUN_IPSEC_REQ_MASK) == 0 &&
977 (ipsr->ipsr_esp_req & IPTUN_IPSEC_REQ_MASK) == 0);
978
979 ASSERT(mutex_owned(&iptun->iptun_lock));
980 itp = iptun->iptun_itp;
981 if (itp == NULL) {
982 if (clear_all)
983 goto bail;
984 if ((rc = dls_mgmt_get_linkinfo(iptun->iptun_linkid, name, NULL,
985 NULL, NULL)) != 0)
986 goto bail;
987 ASSERT(name[0] != '\0');
988 if ((itp = create_tunnel_policy(name, &rc, &gen, ns)) == NULL)
989 goto bail;
990 iptun->iptun_itp = itp;
991 }
992
993 /* Allocate the actvec now, before holding itp or polhead locks. */
994 ipsec_actvec_from_req(ipsr, &actp, &nact, ns);
995 if (actp == NULL) {
996 rc = ENOMEM;
997 goto bail;
998 }
999
1000 /*
1001 * Just write on the active polhead. Save the primary/secondary stuff
1002 * for spdsock operations.
1003 *
1004 * Mutex because we need to write to the polhead AND flags atomically.
1005 * Other threads will acquire the polhead lock as a reader if the
1006 * (unprotected) flag is set.
1007 */
1008 mutex_enter(&itp->itp_lock);
1009 if (itp->itp_flags & ITPF_P_TUNNEL) {
1010 /* Oops, we lost a race. Let's get out of here. */
1011 rc = EBUSY;
1012 goto mutex_bail;
1013 }
1014 old_policy = ((itp->itp_flags & ITPF_P_ACTIVE) != 0);
1015
1016 if (old_policy) {
1017 ITPF_CLONE(itp->itp_flags);
1018 rc = ipsec_copy_polhead(itp->itp_policy, itp->itp_inactive, ns);
1019 if (rc != 0) {
1020 /* inactive has already been cleared. */
1021 itp->itp_flags &= ~ITPF_IFLAGS;
1022 goto mutex_bail;
1023 }
1024 rw_enter(&itp->itp_policy->iph_lock, RW_WRITER);
1025 ipsec_polhead_flush(itp->itp_policy, ns);
1026 } else {
1027 /* Else assume itp->itp_policy is already flushed. */
1028 rw_enter(&itp->itp_policy->iph_lock, RW_WRITER);
1029 }
1030
1031 if (clear_all) {
1032 ASSERT(avl_numnodes(&itp->itp_policy->iph_rulebyid) == 0);
1033 itp->itp_flags &= ~ITPF_PFLAGS;
1034 rw_exit(&itp->itp_policy->iph_lock);
1035 old_policy = B_FALSE; /* Clear out the inactive one too. */
1036 goto recover_bail;
1037 }
1038
1039 if (iptun_insert_simple_policies(itp->itp_policy, actp, nact, ns)) {
1040 rw_exit(&itp->itp_policy->iph_lock);
1041 /*
1042 * Adjust MTU and make sure the DL side knows what's up.
1043 */
1044 itp->itp_flags = ITPF_P_ACTIVE;
1045 (void) iptun_update_mtu(iptun, NULL, 0);
1046 old_policy = B_FALSE; /* Blank out inactive - we succeeded */
1047 } else {
1048 rw_exit(&itp->itp_policy->iph_lock);
1049 rc = ENOMEM;
1050 }
1051
1052 recover_bail:
1053 if (old_policy) {
1054 /* Recover policy in in active polhead. */
1055 ipsec_swap_policy(itp->itp_policy, itp->itp_inactive, ns);
1056 ITPF_SWAP(itp->itp_flags);
1057 }
1058
1059 /* Clear policy in inactive polhead. */
1060 itp->itp_flags &= ~ITPF_IFLAGS;
1061 rw_enter(&itp->itp_inactive->iph_lock, RW_WRITER);
1062 ipsec_polhead_flush(itp->itp_inactive, ns);
1063 rw_exit(&itp->itp_inactive->iph_lock);
1064
1065 mutex_bail:
1066 mutex_exit(&itp->itp_lock);
1067
1068 bail:
1069 if (actp != NULL)
1070 ipsec_actvec_free(actp, nact);
1071
1072 return (rc);
1073 }
1074
1075 static iptun_typeinfo_t *
1076 iptun_gettypeinfo(iptun_type_t type)
1077 {
1078 int i;
1079
1080 for (i = 0; iptun_type_table[i].iti_type != IPTUN_TYPE_UNKNOWN; i++) {
1081 if (iptun_type_table[i].iti_type == type)
1082 break;
1083 }
1084 return (&iptun_type_table[i]);
1085 }
1086
1087 /*
1088 * Set the parameters included in ik on the tunnel iptun. Parameters that can
1089 * only be set at creation time are set in iptun_create().
1090 */
1091 static int
1092 iptun_setparams(iptun_t *iptun, const iptun_kparams_t *ik)
1093 {
1094 int err = 0;
1095 netstack_t *ns = iptun->iptun_ns;
1096 iptun_addr_t orig_laddr, orig_raddr;
1097 uint_t orig_flags = iptun->iptun_flags;
1098
1099 if (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR) {
1100 if (orig_flags & IPTUN_LADDR)
1101 orig_laddr = iptun->iptun_laddr;
1102 if ((err = iptun_setladdr(iptun, &ik->iptun_kparam_laddr)) != 0)
1103 return (err);
1104 iptun->iptun_flags |= IPTUN_LADDR;
1105 }
1106
1107 if (ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR) {
1108 if (orig_flags & IPTUN_RADDR)
1109 orig_raddr = iptun->iptun_raddr;
1110 if ((err = iptun_setraddr(iptun, &ik->iptun_kparam_raddr)) != 0)
1111 goto done;
1112 iptun->iptun_flags |= IPTUN_RADDR;
1113 }
1114
1115 if (ik->iptun_kparam_flags & IPTUN_KPARAM_SECINFO) {
1116 /*
1117 * Set IPsec policy originating from the ifconfig(1M) command
1118 * line. This is traditionally called "simple" policy because
1119 * the ipsec_req_t (iptun_kparam_secinfo) can only describe a
1120 * simple policy of "do ESP on everything" and/or "do AH on
1121 * everything" (as opposed to the rich policy that can be
1122 * defined with ipsecconf(1M)).
1123 */
1124 if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4) {
1125 /*
1126 * Can't set security properties for automatic
1127 * tunnels.
1128 */
1129 err = EINVAL;
1130 goto done;
1131 }
1132
1133 if (!ipsec_loaded(ns->netstack_ipsec)) {
1134 /* If IPsec can be loaded, try and load it now. */
1135 if (ipsec_failed(ns->netstack_ipsec)) {
1136 err = EPROTONOSUPPORT;
1137 goto done;
1138 }
1139 ipsec_loader_loadnow(ns->netstack_ipsec);
1140 /*
1141 * ipsec_loader_loadnow() returns while IPsec is
1142 * loaded asynchronously. While a method exists to
1143 * wait for IPsec to load (ipsec_loader_wait()), it
1144 * requires use of a STREAMS queue to do a qwait().
1145 * We're not in STREAMS context here, and so we can't
1146 * use it. This is not a problem in practice because
1147 * in the vast majority of cases, key management and
1148 * global policy will have loaded before any tunnels
1149 * are plumbed, and so IPsec will already have been
1150 * loaded.
1151 */
1152 err = EAGAIN;
1153 goto done;
1154 }
1155
1156 err = iptun_set_sec_simple(iptun, &ik->iptun_kparam_secinfo);
1157 if (err == 0) {
1158 iptun->iptun_flags |= IPTUN_SIMPLE_POLICY;
1159 iptun->iptun_simple_policy = ik->iptun_kparam_secinfo;
1160 }
1161 }
1162 done:
1163 if (err != 0) {
1164 /* Restore original source and destination. */
1165 if (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR &&
1166 (orig_flags & IPTUN_LADDR))
1167 iptun->iptun_laddr = orig_laddr;
1168 if ((ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR) &&
1169 (orig_flags & IPTUN_RADDR))
1170 iptun->iptun_raddr = orig_raddr;
1171 iptun->iptun_flags = orig_flags;
1172 }
1173 return (err);
1174 }
1175
1176 static int
1177 iptun_register(iptun_t *iptun)
1178 {
1179 mac_register_t *mac;
1180 int err;
1181
1182 ASSERT(!(iptun->iptun_flags & IPTUN_MAC_REGISTERED));
1183
1184 if ((mac = mac_alloc(MAC_VERSION)) == NULL)
1185 return (EINVAL);
1186
1187 mac->m_type_ident = iptun->iptun_typeinfo->iti_ident;
1188 mac->m_driver = iptun;
1189 mac->m_dip = iptun_dip;
1190 mac->m_instance = (uint_t)-1;
1191 mac->m_src_addr = (uint8_t *)&iptun->iptun_laddr.ia_addr;
1192 mac->m_dst_addr = iptun->iptun_typeinfo->iti_hasraddr ?
1193 (uint8_t *)&iptun->iptun_raddr.ia_addr : NULL;
1194 mac->m_callbacks = &iptun_m_callbacks;
1195 mac->m_min_sdu = iptun->iptun_typeinfo->iti_minmtu;
1196 mac->m_max_sdu = iptun->iptun_mtu;
1197 if (iptun->iptun_header_size != 0) {
1198 mac->m_pdata = &iptun->iptun_header;
1199 mac->m_pdata_size = iptun->iptun_header_size;
1200 }
1201 if ((err = mac_register(mac, &iptun->iptun_mh)) == 0)
1202 iptun->iptun_flags |= IPTUN_MAC_REGISTERED;
1203 mac_free(mac);
1204 return (err);
1205 }
1206
1207 static int
1208 iptun_unregister(iptun_t *iptun)
1209 {
1210 int err;
1211
1212 ASSERT(iptun->iptun_flags & IPTUN_MAC_REGISTERED);
1213 if ((err = mac_unregister(iptun->iptun_mh)) == 0)
1214 iptun->iptun_flags &= ~IPTUN_MAC_REGISTERED;
1215 return (err);
1216 }
1217
1218 static conn_t *
1219 iptun_conn_create(iptun_t *iptun, netstack_t *ns, cred_t *credp)
1220 {
1221 conn_t *connp;
1222
1223 if ((connp = ipcl_conn_create(IPCL_IPCCONN, KM_NOSLEEP, ns)) == NULL)
1224 return (NULL);
1225
1226 connp->conn_flags |= IPCL_IPTUN;
1227 connp->conn_iptun = iptun;
1228 connp->conn_recv = iptun_input;
1229 connp->conn_recvicmp = iptun_input_icmp;
1230 connp->conn_verifyicmp = iptun_verifyicmp;
1231
1232 /*
1233 * Register iptun_notify to listen to capability changes detected by IP.
1234 * This upcall is made in the context of the call to conn_ip_output.
1235 */
1236 connp->conn_ixa->ixa_notify = iptun_notify;
1237 connp->conn_ixa->ixa_notify_cookie = iptun;
1238
1239 /*
1240 * For exclusive stacks we set conn_zoneid to GLOBAL_ZONEID as is done
1241 * for all other conn_t's.
1242 *
1243 * Note that there's an important distinction between iptun_zoneid and
1244 * conn_zoneid. The conn_zoneid is set to GLOBAL_ZONEID in non-global
1245 * exclusive stack zones to make the ip module believe that the
1246 * non-global zone is actually a global zone. Therefore, when
1247 * interacting with the ip module, we must always use conn_zoneid.
1248 */
1249 connp->conn_zoneid = (ns->netstack_stackid == GLOBAL_NETSTACKID) ?
1250 crgetzoneid(credp) : GLOBAL_ZONEID;
1251 connp->conn_cred = credp;
1252 /* crfree() is done in ipcl_conn_destroy(), called by CONN_DEC_REF() */
1253 crhold(connp->conn_cred);
1254 connp->conn_cpid = NOPID;
1255
1256 /* conn_allzones can not be set this early, hence no IPCL_ZONEID */
1257 connp->conn_ixa->ixa_zoneid = connp->conn_zoneid;
1258 ASSERT(connp->conn_ref == 1);
1259
1260 /* Cache things in ixa without an extra refhold */
1261 ASSERT(!(connp->conn_ixa->ixa_free_flags & IXA_FREE_CRED));
1262 connp->conn_ixa->ixa_cred = connp->conn_cred;
1263 connp->conn_ixa->ixa_cpid = connp->conn_cpid;
1264 if (is_system_labeled())
1265 connp->conn_ixa->ixa_tsl = crgetlabel(connp->conn_cred);
1266
1267 /*
1268 * Have conn_ip_output drop packets should our outer source
1269 * go invalid
1270 */
1271 connp->conn_ixa->ixa_flags |= IXAF_VERIFY_SOURCE;
1272
1273 switch (iptun->iptun_typeinfo->iti_ipvers) {
1274 case IPV4_VERSION:
1275 connp->conn_family = AF_INET6;
1276 break;
1277 case IPV6_VERSION:
1278 connp->conn_family = AF_INET;
1279 break;
1280 }
1281 mutex_enter(&connp->conn_lock);
1282 connp->conn_state_flags &= ~CONN_INCIPIENT;
1283 mutex_exit(&connp->conn_lock);
1284 return (connp);
1285 }
1286
1287 static void
1288 iptun_conn_destroy(conn_t *connp)
1289 {
1290 ip_quiesce_conn(connp);
1291 connp->conn_iptun = NULL;
1292 ASSERT(connp->conn_ref == 1);
1293 CONN_DEC_REF(connp);
1294 }
1295
1296 static iptun_t *
1297 iptun_alloc(void)
1298 {
1299 iptun_t *iptun;
1300
1301 if ((iptun = kmem_cache_alloc(iptun_cache, KM_NOSLEEP)) != NULL) {
1302 bzero(iptun, sizeof (*iptun));
1303 atomic_inc_32(&iptun_tunnelcount);
1304 }
1305 return (iptun);
1306 }
1307
1308 static void
1309 iptun_free(iptun_t *iptun)
1310 {
1311 ASSERT(iptun->iptun_flags & IPTUN_CONDEMNED);
1312
1313 if (iptun->iptun_flags & IPTUN_HASH_INSERTED) {
1314 iptun_stack_t *iptuns = iptun->iptun_iptuns;
1315
1316 mutex_enter(&iptun_hash_lock);
1317 VERIFY(mod_hash_remove(iptun_hash,
1318 IPTUN_HASH_KEY(iptun->iptun_linkid),
1319 (mod_hash_val_t *)&iptun) == 0);
1320 mutex_exit(&iptun_hash_lock);
1321 iptun->iptun_flags &= ~IPTUN_HASH_INSERTED;
1322 mutex_enter(&iptuns->iptuns_lock);
1323 list_remove(&iptuns->iptuns_iptunlist, iptun);
1324 mutex_exit(&iptuns->iptuns_lock);
1325 }
1326
1327 if (iptun->iptun_flags & IPTUN_BOUND)
1328 iptun_unbind(iptun);
1329
1330 /*
1331 * After iptun_unregister(), there will be no threads executing a
1332 * downcall from the mac module, including in the tx datapath.
1333 */
1334 if (iptun->iptun_flags & IPTUN_MAC_REGISTERED)
1335 VERIFY(iptun_unregister(iptun) == 0);
1336
1337 if (iptun->iptun_itp != NULL) {
1338 /*
1339 * Remove from the AVL tree, AND release the reference iptun_t
1340 * itself holds on the ITP.
1341 */
1342 itp_unlink(iptun->iptun_itp, iptun->iptun_ns);
1343 ITP_REFRELE(iptun->iptun_itp, iptun->iptun_ns);
1344 iptun->iptun_itp = NULL;
1345 iptun->iptun_flags &= ~IPTUN_SIMPLE_POLICY;
1346 }
1347
1348 /*
1349 * After ipcl_conn_destroy(), there will be no threads executing an
1350 * upcall from ip (i.e., iptun_input()), and it is then safe to free
1351 * the iptun_t.
1352 */
1353 if (iptun->iptun_connp != NULL) {
1354 iptun_conn_destroy(iptun->iptun_connp);
1355 iptun->iptun_connp = NULL;
1356 }
1357
1358 kmem_cache_free(iptun_cache, iptun);
1359 atomic_dec_32(&iptun_tunnelcount);
1360 }
1361
1362 int
1363 iptun_create(iptun_kparams_t *ik, cred_t *credp)
1364 {
1365 iptun_t *iptun = NULL;
1366 int err = 0, mherr;
1367 char linkname[MAXLINKNAMELEN];
1368 ipsec_tun_pol_t *itp;
1369 netstack_t *ns = NULL;
1370 iptun_stack_t *iptuns;
1371 datalink_id_t tmpid;
1372 zoneid_t zoneid = crgetzoneid(credp);
1373 boolean_t link_created = B_FALSE;
1374
1375 /* The tunnel type is mandatory */
1376 if (!(ik->iptun_kparam_flags & IPTUN_KPARAM_TYPE))
1377 return (EINVAL);
1378
1379 /*
1380 * Is the linkid that the caller wishes to associate with this new
1381 * tunnel assigned to this zone?
1382 */
1383 if (zone_check_datalink(&zoneid, ik->iptun_kparam_linkid) != 0) {
1384 if (zoneid != GLOBAL_ZONEID)
1385 return (EINVAL);
1386 } else if (zoneid == GLOBAL_ZONEID) {
1387 return (EINVAL);
1388 }
1389
1390 /*
1391 * Make sure that we're not trying to create a tunnel that has already
1392 * been created.
1393 */
1394 if (iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun) == 0) {
1395 iptun_exit(iptun);
1396 iptun = NULL;
1397 err = EEXIST;
1398 goto done;
1399 }
1400
1401 ns = netstack_find_by_cred(credp);
1402 iptuns = ns->netstack_iptun;
1403
1404 if ((iptun = iptun_alloc()) == NULL) {
1405 err = ENOMEM;
1406 goto done;
1407 }
1408
1409 iptun->iptun_linkid = ik->iptun_kparam_linkid;
1410 iptun->iptun_zoneid = zoneid;
1411 iptun->iptun_ns = ns;
1412
1413 iptun->iptun_typeinfo = iptun_gettypeinfo(ik->iptun_kparam_type);
1414 if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_UNKNOWN) {
1415 err = EINVAL;
1416 goto done;
1417 }
1418
1419 if (ik->iptun_kparam_flags & IPTUN_KPARAM_IMPLICIT)
1420 iptun->iptun_flags |= IPTUN_IMPLICIT;
1421
1422 if ((err = iptun_setparams(iptun, ik)) != 0)
1423 goto done;
1424
1425 iptun->iptun_hoplimit = IPTUN_DEFAULT_HOPLIMIT;
1426 if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_IPV6)
1427 iptun->iptun_encaplimit = IPTUN_DEFAULT_ENCAPLIMIT;
1428
1429 iptun_headergen(iptun, B_FALSE);
1430
1431 iptun->iptun_connp = iptun_conn_create(iptun, ns, credp);
1432 if (iptun->iptun_connp == NULL) {
1433 err = ENOMEM;
1434 goto done;
1435 }
1436
1437 iptun->iptun_mtu = iptun->iptun_typeinfo->iti_maxmtu;
1438 iptun->iptun_dpmtu = iptun->iptun_mtu;
1439
1440 /*
1441 * Find an ITP based on linkname. If we have parms already set via
1442 * the iptun_setparams() call above, it may have created an ITP for
1443 * us. We always try get_tunnel_policy() for DEBUG correctness
1444 * checks, and we may wish to refactor this to only check when
1445 * iptun_itp is NULL.
1446 */
1447 if ((err = dls_mgmt_get_linkinfo(iptun->iptun_linkid, linkname, NULL,
1448 NULL, NULL)) != 0)
1449 goto done;
1450 if ((itp = get_tunnel_policy(linkname, ns)) != NULL)
1451 iptun->iptun_itp = itp;
1452
1453 /*
1454 * See if we have the necessary IP addresses assigned to this tunnel
1455 * to try and bind them with ip underneath us. If we're not ready to
1456 * bind yet, then we'll defer the bind operation until the addresses
1457 * are modified.
1458 */
1459 if (iptun_canbind(iptun) && ((err = iptun_bind(iptun)) != 0))
1460 goto done;
1461
1462 if ((err = iptun_register(iptun)) != 0)
1463 goto done;
1464
1465 err = dls_devnet_create(iptun->iptun_mh, iptun->iptun_linkid,
1466 iptun->iptun_zoneid);
1467 if (err != 0)
1468 goto done;
1469 link_created = B_TRUE;
1470
1471 /*
1472 * We hash by link-id as that is the key used by all other iptun
1473 * interfaces (modify, delete, etc.).
1474 */
1475 if ((mherr = mod_hash_insert(iptun_hash,
1476 IPTUN_HASH_KEY(iptun->iptun_linkid), (mod_hash_val_t)iptun)) == 0) {
1477 mutex_enter(&iptuns->iptuns_lock);
1478 list_insert_head(&iptuns->iptuns_iptunlist, iptun);
1479 mutex_exit(&iptuns->iptuns_lock);
1480 iptun->iptun_flags |= IPTUN_HASH_INSERTED;
1481 } else if (mherr == MH_ERR_NOMEM) {
1482 err = ENOMEM;
1483 } else if (mherr == MH_ERR_DUPLICATE) {
1484 err = EEXIST;
1485 } else {
1486 err = EINVAL;
1487 }
1488
1489 done:
1490 if (iptun == NULL && ns != NULL)
1491 netstack_rele(ns);
1492 if (err != 0 && iptun != NULL) {
1493 if (link_created) {
1494 (void) dls_devnet_destroy(iptun->iptun_mh, &tmpid,
1495 B_TRUE);
1496 }
1497 iptun->iptun_flags |= IPTUN_CONDEMNED;
1498 iptun_free(iptun);
1499 }
1500 return (err);
1501 }
1502
1503 int
1504 iptun_delete(datalink_id_t linkid, cred_t *credp)
1505 {
1506 int err;
1507 iptun_t *iptun = NULL;
1508
1509 if ((err = iptun_enter_by_linkid(linkid, &iptun)) != 0)
1510 return (err);
1511
1512 /* One cannot delete a tunnel that belongs to another zone. */
1513 if (iptun->iptun_zoneid != crgetzoneid(credp)) {
1514 iptun_exit(iptun);
1515 return (EACCES);
1516 }
1517
1518 /*
1519 * We need to exit iptun in order to issue calls up the stack such as
1520 * dls_devnet_destroy(). If we call up while still in iptun, deadlock
1521 * with calls coming down the stack is possible. We prevent other
1522 * threads from entering this iptun after we've exited it by setting
1523 * the IPTUN_DELETE_PENDING flag. This will cause callers of
1524 * iptun_enter() to block waiting on iptun_enter_cv. The assumption
1525 * here is that the functions we're calling while IPTUN_DELETE_PENDING
1526 * is set dont resuult in an iptun_enter() call, as that would result
1527 * in deadlock.
1528 */
1529 iptun->iptun_flags |= IPTUN_DELETE_PENDING;
1530
1531 /* Wait for any pending upcall to the mac module to complete. */
1532 while (iptun->iptun_flags & IPTUN_UPCALL_PENDING)
1533 cv_wait(&iptun->iptun_upcall_cv, &iptun->iptun_lock);
1534
1535 iptun_exit(iptun);
1536
1537 if ((err = dls_devnet_destroy(iptun->iptun_mh, &linkid, B_TRUE)) == 0) {
1538 /*
1539 * mac_disable() will fail with EBUSY if there are references
1540 * to the iptun MAC. If there are none, then mac_disable()
1541 * will assure that none can be acquired until the MAC is
1542 * unregistered.
1543 *
1544 * XXX CR 6791335 prevents us from calling mac_disable() prior
1545 * to dls_devnet_destroy(), so we unfortunately need to
1546 * attempt to re-create the devnet node if mac_disable()
1547 * fails.
1548 */
1549 if ((err = mac_disable(iptun->iptun_mh)) != 0) {
1550 (void) dls_devnet_create(iptun->iptun_mh, linkid,
1551 iptun->iptun_zoneid);
1552 }
1553 }
1554
1555 /*
1556 * Now that we know the fate of this iptun_t, we need to clear
1557 * IPTUN_DELETE_PENDING, and set IPTUN_CONDEMNED if the iptun_t is
1558 * slated to be freed. Either way, we need to signal the threads
1559 * waiting in iptun_enter() so that they can either fail if
1560 * IPTUN_CONDEMNED is set, or continue if it's not.
1561 */
1562 mutex_enter(&iptun->iptun_lock);
1563 iptun->iptun_flags &= ~IPTUN_DELETE_PENDING;
1564 if (err == 0)
1565 iptun->iptun_flags |= IPTUN_CONDEMNED;
1566 cv_broadcast(&iptun->iptun_enter_cv);
1567 mutex_exit(&iptun->iptun_lock);
1568
1569 /*
1570 * Note that there is no danger in calling iptun_free() after having
1571 * dropped the iptun_lock since callers of iptun_enter() at this point
1572 * are doing so from iptun_enter_by_linkid() (mac_disable() got rid of
1573 * threads entering from mac callbacks which call iptun_enter()
1574 * directly) which holds iptun_hash_lock, and iptun_free() grabs this
1575 * lock in order to remove the iptun_t from the hash table.
1576 */
1577 if (err == 0)
1578 iptun_free(iptun);
1579
1580 return (err);
1581 }
1582
1583 int
1584 iptun_modify(const iptun_kparams_t *ik, cred_t *credp)
1585 {
1586 iptun_t *iptun;
1587 boolean_t laddr_change = B_FALSE, raddr_change = B_FALSE;
1588 int err;
1589
1590 if ((err = iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun)) != 0)
1591 return (err);
1592
1593 /* One cannot modify a tunnel that belongs to another zone. */
1594 if (iptun->iptun_zoneid != crgetzoneid(credp)) {
1595 err = EACCES;
1596 goto done;
1597 }
1598
1599 /* The tunnel type cannot be changed */
1600 if (ik->iptun_kparam_flags & IPTUN_KPARAM_TYPE) {
1601 err = EINVAL;
1602 goto done;
1603 }
1604
1605 if ((err = iptun_setparams(iptun, ik)) != 0)
1606 goto done;
1607 iptun_headergen(iptun, B_FALSE);
1608
1609 /*
1610 * If any of the tunnel's addresses has been modified and the tunnel
1611 * has the necessary addresses assigned to it, we need to try to bind
1612 * with ip underneath us. If we're not ready to bind yet, then we'll
1613 * try again when the addresses are modified later.
1614 */
1615 laddr_change = (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR);
1616 raddr_change = (ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR);
1617 if (laddr_change || raddr_change) {
1618 if (iptun->iptun_flags & IPTUN_BOUND)
1619 iptun_unbind(iptun);
1620 if (iptun_canbind(iptun) && (err = iptun_bind(iptun)) != 0) {
1621 if (laddr_change)
1622 iptun->iptun_flags &= ~IPTUN_LADDR;
1623 if (raddr_change)
1624 iptun->iptun_flags &= ~IPTUN_RADDR;
1625 goto done;
1626 }
1627 }
1628
1629 if (laddr_change)
1630 iptun_task_dispatch(iptun, IPTUN_TASK_LADDR_UPDATE);
1631 if (raddr_change)
1632 iptun_task_dispatch(iptun, IPTUN_TASK_RADDR_UPDATE);
1633
1634 done:
1635 iptun_exit(iptun);
1636 return (err);
1637 }
1638
1639 /* Given an IP tunnel's datalink id, fill in its parameters. */
1640 int
1641 iptun_info(iptun_kparams_t *ik, cred_t *credp)
1642 {
1643 iptun_t *iptun;
1644 int err;
1645
1646 /* Is the tunnel link visible from the caller's zone? */
1647 if (!dls_devnet_islinkvisible(ik->iptun_kparam_linkid,
1648 crgetzoneid(credp)))
1649 return (ENOENT);
1650
1651 if ((err = iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun)) != 0)
1652 return (err);
1653
1654 bzero(ik, sizeof (iptun_kparams_t));
1655
1656 ik->iptun_kparam_linkid = iptun->iptun_linkid;
1657 ik->iptun_kparam_type = iptun->iptun_typeinfo->iti_type;
1658 ik->iptun_kparam_flags |= IPTUN_KPARAM_TYPE;
1659
1660 if (iptun->iptun_flags & IPTUN_LADDR) {
1661 iptun_getaddr(&iptun->iptun_laddr, &ik->iptun_kparam_laddr);
1662 ik->iptun_kparam_flags |= IPTUN_KPARAM_LADDR;
1663 }
1664 if (iptun->iptun_flags & IPTUN_RADDR) {
1665 iptun_getaddr(&iptun->iptun_raddr, &ik->iptun_kparam_raddr);
1666 ik->iptun_kparam_flags |= IPTUN_KPARAM_RADDR;
1667 }
1668
1669 if (iptun->iptun_flags & IPTUN_IMPLICIT)
1670 ik->iptun_kparam_flags |= IPTUN_KPARAM_IMPLICIT;
1671
1672 if (iptun->iptun_itp != NULL) {
1673 mutex_enter(&iptun->iptun_itp->itp_lock);
1674 if (iptun->iptun_itp->itp_flags & ITPF_P_ACTIVE) {
1675 ik->iptun_kparam_flags |= IPTUN_KPARAM_IPSECPOL;
1676 if (iptun->iptun_flags & IPTUN_SIMPLE_POLICY) {
1677 ik->iptun_kparam_flags |= IPTUN_KPARAM_SECINFO;
1678 ik->iptun_kparam_secinfo =
1679 iptun->iptun_simple_policy;
1680 }
1681 }
1682 mutex_exit(&iptun->iptun_itp->itp_lock);
1683 }
1684
1685 done:
1686 iptun_exit(iptun);
1687 return (err);
1688 }
1689
1690 int
1691 iptun_set_6to4relay(netstack_t *ns, ipaddr_t relay_addr)
1692 {
1693 if (relay_addr == INADDR_BROADCAST || CLASSD(relay_addr))
1694 return (EADDRNOTAVAIL);
1695 ns->netstack_iptun->iptuns_relay_rtr_addr = relay_addr;
1696 return (0);
1697 }
1698
1699 void
1700 iptun_get_6to4relay(netstack_t *ns, ipaddr_t *relay_addr)
1701 {
1702 *relay_addr = ns->netstack_iptun->iptuns_relay_rtr_addr;
1703 }
1704
1705 void
1706 iptun_set_policy(datalink_id_t linkid, ipsec_tun_pol_t *itp)
1707 {
1708 iptun_t *iptun;
1709
1710 if (iptun_enter_by_linkid(linkid, &iptun) != 0)
1711 return;
1712 if (iptun->iptun_itp != itp) {
1713 ASSERT(iptun->iptun_itp == NULL);
1714 ITP_REFHOLD(itp);
1715 iptun->iptun_itp = itp;
1716 }
1717 /*
1718 * IPsec policy means IPsec overhead, which means lower MTU.
1719 * Refresh the MTU for this tunnel.
1720 */
1721 (void) iptun_update_mtu(iptun, NULL, 0);
1722 iptun_exit(iptun);
1723 }
1724
1725 /*
1726 * Obtain the path MTU to the tunnel destination.
1727 * Can return zero in some cases.
1728 */
1729 static uint32_t
1730 iptun_get_dst_pmtu(iptun_t *iptun, ip_xmit_attr_t *ixa)
1731 {
1732 uint32_t pmtu = 0;
1733 conn_t *connp = iptun->iptun_connp;
1734 boolean_t need_rele = B_FALSE;
1735
1736 /*
1737 * We only obtain the pmtu for tunnels that have a remote tunnel
1738 * address.
1739 */
1740 if (!(iptun->iptun_flags & IPTUN_RADDR))
1741 return (0);
1742
1743 if (ixa == NULL) {
1744 ixa = conn_get_ixa(connp, B_FALSE);
1745 if (ixa == NULL)
1746 return (0);
1747 need_rele = B_TRUE;
1748 }
1749 /*
1750 * Guard against ICMP errors before we have sent, as well as against
1751 * and a thread which held conn_ixa.
1752 */
1753 if (ixa->ixa_ire != NULL) {
1754 pmtu = ip_get_pmtu(ixa);
1755
1756 /*
1757 * For both IPv4 and IPv6 we can have indication that the outer
1758 * header needs fragmentation.
1759 */
1760 if (ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) {
1761 /* Must allow fragmentation in ip_output */
1762 ixa->ixa_flags &= ~IXAF_DONTFRAG;
1763 } else if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4) {
1764 ixa->ixa_flags |= IXAF_DONTFRAG;
1765 } else {
1766 /* ip_get_pmtu might have set this - we don't want it */
1767 ixa->ixa_flags &= ~IXAF_PMTU_IPV4_DF;
1768 }
1769 }
1770
1771 if (need_rele)
1772 ixa_refrele(ixa);
1773 return (pmtu);
1774 }
1775
1776 /*
1777 * Update the ip_xmit_attr_t to capture the current lower path mtu as known
1778 * by ip.
1779 */
1780 static void
1781 iptun_update_dst_pmtu(iptun_t *iptun, ip_xmit_attr_t *ixa)
1782 {
1783 uint32_t pmtu;
1784 conn_t *connp = iptun->iptun_connp;
1785 boolean_t need_rele = B_FALSE;
1786
1787 /* IXAF_VERIFY_PMTU is not set if we don't have a fixed destination */
1788 if (!(iptun->iptun_flags & IPTUN_RADDR))
1789 return;
1790
1791 if (ixa == NULL) {
1792 ixa = conn_get_ixa(connp, B_FALSE);
1793 if (ixa == NULL)
1794 return;
1795 need_rele = B_TRUE;
1796 }
1797 /*
1798 * Guard against ICMP errors before we have sent, as well as against
1799 * and a thread which held conn_ixa.
1800 */
1801 if (ixa->ixa_ire != NULL) {
1802 pmtu = ip_get_pmtu(ixa);
1803 /*
1804 * Update ixa_fragsize and ixa_pmtu.
1805 */
1806 ixa->ixa_fragsize = ixa->ixa_pmtu = pmtu;
1807
1808 /*
1809 * For both IPv4 and IPv6 we can have indication that the outer
1810 * header needs fragmentation.
1811 */
1812 if (ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) {
1813 /* Must allow fragmentation in ip_output */
1814 ixa->ixa_flags &= ~IXAF_DONTFRAG;
1815 } else if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4) {
1816 ixa->ixa_flags |= IXAF_DONTFRAG;
1817 } else {
1818 /* ip_get_pmtu might have set this - we don't want it */
1819 ixa->ixa_flags &= ~IXAF_PMTU_IPV4_DF;
1820 }
1821 }
1822
1823 if (need_rele)
1824 ixa_refrele(ixa);
1825 }
1826
1827 /*
1828 * There is nothing that iptun can verify in addition to IP having
1829 * verified the IP addresses in the fanout.
1830 */
1831 /* ARGSUSED */
1832 static boolean_t
1833 iptun_verifyicmp(conn_t *connp, void *arg2, icmph_t *icmph, icmp6_t *icmp6,
1834 ip_recv_attr_t *ira)
1835 {
1836 return (B_TRUE);
1837 }
1838
1839 /*
1840 * Notify function registered with ip_xmit_attr_t.
1841 */
1842 static void
1843 iptun_notify(void *arg, ip_xmit_attr_t *ixa, ixa_notify_type_t ntype,
1844 ixa_notify_arg_t narg)
1845 {
1846 iptun_t *iptun = (iptun_t *)arg;
1847
1848 switch (ntype) {
1849 case IXAN_PMTU:
1850 (void) iptun_update_mtu(iptun, ixa, narg);
1851 break;
1852 }
1853 }
1854
1855 /*
1856 * Returns the max of old_ovhd and the overhead associated with pol.
1857 */
1858 static uint32_t
1859 iptun_max_policy_overhead(ipsec_policy_t *pol, uint32_t old_ovhd)
1860 {
1861 uint32_t new_ovhd = old_ovhd;
1862
1863 while (pol != NULL) {
1864 new_ovhd = max(new_ovhd,
1865 ipsec_act_ovhd(&pol->ipsp_act->ipa_act));
1866 pol = pol->ipsp_hash.hash_next;
1867 }
1868 return (new_ovhd);
1869 }
1870
1871 static uint32_t
1872 iptun_get_ipsec_overhead(iptun_t *iptun)
1873 {
1874 ipsec_policy_root_t *ipr;
1875 ipsec_policy_head_t *iph;
1876 ipsec_policy_t *pol;
1877 ipsec_selector_t sel;
1878 int i;
1879 uint32_t ipsec_ovhd = 0;
1880 ipsec_tun_pol_t *itp = iptun->iptun_itp;
1881 netstack_t *ns = iptun->iptun_ns;
1882
1883 if (itp == NULL || !(itp->itp_flags & ITPF_P_ACTIVE)) {
1884 /*
1885 * Consult global policy, just in case. This will only work
1886 * if we have both source and destination addresses to work
1887 * with.
1888 */
1889 if ((iptun->iptun_flags & (IPTUN_LADDR|IPTUN_RADDR)) !=
1890 (IPTUN_LADDR|IPTUN_RADDR))
1891 return (0);
1892
1893 iph = ipsec_system_policy(ns);
1894 bzero(&sel, sizeof (sel));
1895 sel.ips_isv4 =
1896 (iptun->iptun_typeinfo->iti_ipvers == IPV4_VERSION);
1897 switch (iptun->iptun_typeinfo->iti_ipvers) {
1898 case IPV4_VERSION:
1899 sel.ips_local_addr_v4 = iptun->iptun_laddr4;
1900 sel.ips_remote_addr_v4 = iptun->iptun_raddr4;
1901 break;
1902 case IPV6_VERSION:
1903 sel.ips_local_addr_v6 = iptun->iptun_laddr6;
1904 sel.ips_remote_addr_v6 = iptun->iptun_raddr6;
1905 break;
1906 }
1907 /* Check for both IPv4 and IPv6. */
1908 sel.ips_protocol = IPPROTO_ENCAP;
1909 pol = ipsec_find_policy_head(NULL, iph, IPSEC_TYPE_OUTBOUND,
1910 &sel);
1911 if (pol != NULL) {
1912 ipsec_ovhd = ipsec_act_ovhd(&pol->ipsp_act->ipa_act);
1913 IPPOL_REFRELE(pol);
1914 }
1915 sel.ips_protocol = IPPROTO_IPV6;
1916 pol = ipsec_find_policy_head(NULL, iph, IPSEC_TYPE_OUTBOUND,
1917 &sel);
1918 if (pol != NULL) {
1919 ipsec_ovhd = max(ipsec_ovhd,
1920 ipsec_act_ovhd(&pol->ipsp_act->ipa_act));
1921 IPPOL_REFRELE(pol);
1922 }
1923 IPPH_REFRELE(iph, ns);
1924 } else {
1925 /*
1926 * Look through all of the possible IPsec actions for the
1927 * tunnel, and find the largest potential IPsec overhead.
1928 */
1929 iph = itp->itp_policy;
1930 rw_enter(&iph->iph_lock, RW_READER);
1931 ipr = &(iph->iph_root[IPSEC_TYPE_OUTBOUND]);
1932 ipsec_ovhd = iptun_max_policy_overhead(
1933 ipr->ipr_nonhash[IPSEC_AF_V4], 0);
1934 ipsec_ovhd = iptun_max_policy_overhead(
1935 ipr->ipr_nonhash[IPSEC_AF_V6], ipsec_ovhd);
1936 for (i = 0; i < ipr->ipr_nchains; i++) {
1937 ipsec_ovhd = iptun_max_policy_overhead(
1938 ipr->ipr_hash[i].hash_head, ipsec_ovhd);
1939 }
1940 rw_exit(&iph->iph_lock);
1941 }
1942
1943 return (ipsec_ovhd);
1944 }
1945
1946 /*
1947 * Calculate and return the maximum possible upper MTU for the given tunnel.
1948 *
1949 * If new_pmtu is set then we also need to update the lower path MTU information
1950 * in the ip_xmit_attr_t. That is needed since we set IXAF_VERIFY_PMTU so that
1951 * we are notified by conn_ip_output() when the path MTU increases.
1952 */
1953 static uint32_t
1954 iptun_get_maxmtu(iptun_t *iptun, ip_xmit_attr_t *ixa, uint32_t new_pmtu)
1955 {
1956 size_t header_size, ipsec_overhead;
1957 uint32_t maxmtu, pmtu;
1958
1959 /*
1960 * Start with the path-MTU to the remote address, which is either
1961 * provided as the new_pmtu argument, or obtained using
1962 * iptun_get_dst_pmtu().
1963 */
1964 if (new_pmtu != 0) {
1965 if (iptun->iptun_flags & IPTUN_RADDR)
1966 iptun->iptun_dpmtu = new_pmtu;
1967 pmtu = new_pmtu;
1968 } else if (iptun->iptun_flags & IPTUN_RADDR) {
1969 if ((pmtu = iptun_get_dst_pmtu(iptun, ixa)) == 0) {
1970 /*
1971 * We weren't able to obtain the path-MTU of the
1972 * destination. Use the previous value.
1973 */
1974 pmtu = iptun->iptun_dpmtu;
1975 } else {
1976 iptun->iptun_dpmtu = pmtu;
1977 }
1978 } else {
1979 /*
1980 * We have no path-MTU information to go on, use the maximum
1981 * possible value.
1982 */
1983 pmtu = iptun->iptun_typeinfo->iti_maxmtu;
1984 }
1985
1986 /*
1987 * Now calculate tunneling overhead and subtract that from the
1988 * path-MTU information obtained above.
1989 */
1990 if (iptun->iptun_header_size != 0) {
1991 header_size = iptun->iptun_header_size;
1992 } else {
1993 switch (iptun->iptun_typeinfo->iti_ipvers) {
1994 case IPV4_VERSION:
1995 header_size = sizeof (ipha_t);
1996 if (is_system_labeled())
1997 header_size += IP_MAX_OPT_LENGTH;
1998 break;
1999 case IPV6_VERSION:
2000 header_size = sizeof (iptun_ipv6hdrs_t);
2001 break;
2002 }
2003 }
2004
2005 ipsec_overhead = iptun_get_ipsec_overhead(iptun);
2006
2007 maxmtu = pmtu - (header_size + ipsec_overhead);
2008 return (max(maxmtu, iptun->iptun_typeinfo->iti_minmtu));
2009 }
2010
2011 /*
2012 * Re-calculate the tunnel's MTU as seen from above and notify the MAC layer
2013 * of any change in MTU. The new_pmtu argument is the new lower path MTU to
2014 * the tunnel destination to be used in the tunnel MTU calculation. Passing
2015 * in 0 for new_pmtu causes the lower path MTU to be dynamically updated using
2016 * ip_get_pmtu().
2017 *
2018 * If the calculated tunnel MTU is different than its previous value, then we
2019 * notify the MAC layer above us of this change using mac_maxsdu_update().
2020 */
2021 static uint32_t
2022 iptun_update_mtu(iptun_t *iptun, ip_xmit_attr_t *ixa, uint32_t new_pmtu)
2023 {
2024 uint32_t newmtu;
2025
2026 /* We always update the ixa since we might have set IXAF_VERIFY_PMTU */
2027 iptun_update_dst_pmtu(iptun, ixa);
2028
2029 /*
2030 * We return the current MTU without updating it if it was pegged to a
2031 * static value using the MAC_PROP_MTU link property.
2032 */
2033 if (iptun->iptun_flags & IPTUN_FIXED_MTU)
2034 return (iptun->iptun_mtu);
2035
2036 /* If the MTU isn't fixed, then use the maximum possible value. */
2037 newmtu = iptun_get_maxmtu(iptun, ixa, new_pmtu);
2038 /*
2039 * We only dynamically adjust the tunnel MTU for tunnels with
2040 * destinations because dynamic MTU calculations are based on the
2041 * destination path-MTU.
2042 */
2043 if ((iptun->iptun_flags & IPTUN_RADDR) && newmtu != iptun->iptun_mtu) {
2044 iptun->iptun_mtu = newmtu;
2045 if (iptun->iptun_flags & IPTUN_MAC_REGISTERED)
2046 iptun_task_dispatch(iptun, IPTUN_TASK_MTU_UPDATE);
2047 }
2048
2049 return (newmtu);
2050 }
2051
2052 /*
2053 * Frees a packet or packet chain and bumps stat for each freed packet.
2054 */
2055 static void
2056 iptun_drop_pkt(mblk_t *mp, uint64_t *stat)
2057 {
2058 mblk_t *pktmp;
2059
2060 for (pktmp = mp; pktmp != NULL; pktmp = mp) {
2061 mp = mp->b_next;
2062 pktmp->b_next = NULL;
2063 if (stat != NULL)
2064 atomic_inc_64(stat);
2065 freemsg(pktmp);
2066 }
2067 }
2068
2069 /*
2070 * Allocate and return a new mblk to hold an IP and ICMP header, and chain the
2071 * original packet to its b_cont. Returns NULL on failure.
2072 */
2073 static mblk_t *
2074 iptun_build_icmperr(size_t hdrs_size, mblk_t *orig_pkt)
2075 {
2076 mblk_t *icmperr_mp;
2077
2078 if ((icmperr_mp = allocb(hdrs_size, BPRI_MED)) != NULL) {
2079 icmperr_mp->b_wptr += hdrs_size;
2080 /* tack on the offending packet */
2081 icmperr_mp->b_cont = orig_pkt;
2082 }
2083 return (icmperr_mp);
2084 }
2085
2086 /*
2087 * Transmit an ICMP error. mp->b_rptr points at the packet to be included in
2088 * the ICMP error.
2089 */
2090 static void
2091 iptun_sendicmp_v4(iptun_t *iptun, icmph_t *icmp, ipha_t *orig_ipha, mblk_t *mp,
2092 ts_label_t *tsl)
2093 {
2094 size_t orig_pktsize, hdrs_size;
2095 mblk_t *icmperr_mp;
2096 ipha_t *new_ipha;
2097 icmph_t *new_icmp;
2098 ip_xmit_attr_t ixas;
2099 conn_t *connp = iptun->iptun_connp;
2100
2101 orig_pktsize = msgdsize(mp);
2102 hdrs_size = sizeof (ipha_t) + sizeof (icmph_t);
2103 if ((icmperr_mp = iptun_build_icmperr(hdrs_size, mp)) == NULL) {
2104 iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf);
2105 return;
2106 }
2107
2108 new_ipha = (ipha_t *)icmperr_mp->b_rptr;
2109 new_icmp = (icmph_t *)(new_ipha + 1);
2110
2111 new_ipha->ipha_version_and_hdr_length = IP_SIMPLE_HDR_VERSION;
2112 new_ipha->ipha_type_of_service = 0;
2113 new_ipha->ipha_ident = 0;
2114 new_ipha->ipha_fragment_offset_and_flags = 0;
2115 new_ipha->ipha_ttl = orig_ipha->ipha_ttl;
2116 new_ipha->ipha_protocol = IPPROTO_ICMP;
2117 new_ipha->ipha_src = orig_ipha->ipha_dst;
2118 new_ipha->ipha_dst = orig_ipha->ipha_src;
2119 new_ipha->ipha_hdr_checksum = 0; /* will be computed by ip */
2120 new_ipha->ipha_length = htons(hdrs_size + orig_pktsize);
2121
2122 *new_icmp = *icmp;
2123 new_icmp->icmph_checksum = 0;
2124 new_icmp->icmph_checksum = IP_CSUM(icmperr_mp, sizeof (ipha_t), 0);
2125
2126 bzero(&ixas, sizeof (ixas));
2127 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V4;
2128 if (new_ipha->ipha_src == INADDR_ANY) {
2129 ixas.ixa_flags &= ~IXAF_VERIFY_SOURCE;
2130 ixas.ixa_flags |= IXAF_SET_SOURCE;
2131 }
2132
2133 ixas.ixa_zoneid = IPCL_ZONEID(connp);
2134 ixas.ixa_ipst = connp->conn_netstack->netstack_ip;
2135 ixas.ixa_cred = connp->conn_cred;
2136 ixas.ixa_cpid = NOPID;
2137 if (is_system_labeled())
2138 ixas.ixa_tsl = tsl;
2139
2140 ixas.ixa_ifindex = 0;
2141 ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
2142
2143 (void) ip_output_simple(icmperr_mp, &ixas);
2144 ixa_cleanup(&ixas);
2145 }
2146
2147 static void
2148 iptun_sendicmp_v6(iptun_t *iptun, icmp6_t *icmp6, ip6_t *orig_ip6h, mblk_t *mp,
2149 ts_label_t *tsl)
2150 {
2151 size_t orig_pktsize, hdrs_size;
2152 mblk_t *icmp6err_mp;
2153 ip6_t *new_ip6h;
2154 icmp6_t *new_icmp6;
2155 ip_xmit_attr_t ixas;
2156 conn_t *connp = iptun->iptun_connp;
2157
2158 orig_pktsize = msgdsize(mp);
2159 hdrs_size = sizeof (ip6_t) + sizeof (icmp6_t);
2160 if ((icmp6err_mp = iptun_build_icmperr(hdrs_size, mp)) == NULL) {
2161 iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf);
2162 return;
2163 }
2164
2165 new_ip6h = (ip6_t *)icmp6err_mp->b_rptr;
2166 new_icmp6 = (icmp6_t *)(new_ip6h + 1);
2167
2168 new_ip6h->ip6_vcf = orig_ip6h->ip6_vcf;
2169 new_ip6h->ip6_plen = htons(sizeof (icmp6_t) + orig_pktsize);
2170 new_ip6h->ip6_hops = orig_ip6h->ip6_hops;
2171 new_ip6h->ip6_nxt = IPPROTO_ICMPV6;
2172 new_ip6h->ip6_src = orig_ip6h->ip6_dst;
2173 new_ip6h->ip6_dst = orig_ip6h->ip6_src;
2174
2175 *new_icmp6 = *icmp6;
2176 /* The checksum is calculated in ip_output_simple and friends. */
2177 new_icmp6->icmp6_cksum = new_ip6h->ip6_plen;
2178
2179 bzero(&ixas, sizeof (ixas));
2180 ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6;
2181 if (IN6_IS_ADDR_UNSPECIFIED(&new_ip6h->ip6_src)) {
2182 ixas.ixa_flags &= ~IXAF_VERIFY_SOURCE;
2183 ixas.ixa_flags |= IXAF_SET_SOURCE;
2184 }
2185
2186 ixas.ixa_zoneid = IPCL_ZONEID(connp);
2187 ixas.ixa_ipst = connp->conn_netstack->netstack_ip;
2188 ixas.ixa_cred = connp->conn_cred;
2189 ixas.ixa_cpid = NOPID;
2190 if (is_system_labeled())
2191 ixas.ixa_tsl = tsl;
2192
2193 ixas.ixa_ifindex = 0;
2194 ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
2195
2196 (void) ip_output_simple(icmp6err_mp, &ixas);
2197 ixa_cleanup(&ixas);
2198 }
2199
2200 static void
2201 iptun_icmp_error_v4(iptun_t *iptun, ipha_t *orig_ipha, mblk_t *mp,
2202 uint8_t type, uint8_t code, ts_label_t *tsl)
2203 {
2204 icmph_t icmp;
2205
2206 bzero(&icmp, sizeof (icmp));
2207 icmp.icmph_type = type;
2208 icmp.icmph_code = code;
2209
2210 iptun_sendicmp_v4(iptun, &icmp, orig_ipha, mp, tsl);
2211 }
2212
2213 static void
2214 iptun_icmp_fragneeded_v4(iptun_t *iptun, uint32_t newmtu, ipha_t *orig_ipha,
2215 mblk_t *mp, ts_label_t *tsl)
2216 {
2217 icmph_t icmp;
2218
2219 icmp.icmph_type = ICMP_DEST_UNREACHABLE;
2220 icmp.icmph_code = ICMP_FRAGMENTATION_NEEDED;
2221 icmp.icmph_du_zero = 0;
2222 icmp.icmph_du_mtu = htons(newmtu);
2223
2224 iptun_sendicmp_v4(iptun, &icmp, orig_ipha, mp, tsl);
2225 }
2226
2227 static void
2228 iptun_icmp_error_v6(iptun_t *iptun, ip6_t *orig_ip6h, mblk_t *mp,
2229 uint8_t type, uint8_t code, uint32_t offset, ts_label_t *tsl)
2230 {
2231 icmp6_t icmp6;
2232
2233 bzero(&icmp6, sizeof (icmp6));
2234 icmp6.icmp6_type = type;
2235 icmp6.icmp6_code = code;
2236 if (type == ICMP6_PARAM_PROB)
2237 icmp6.icmp6_pptr = htonl(offset);
2238
2239 iptun_sendicmp_v6(iptun, &icmp6, orig_ip6h, mp, tsl);
2240 }
2241
2242 static void
2243 iptun_icmp_toobig_v6(iptun_t *iptun, uint32_t newmtu, ip6_t *orig_ip6h,
2244 mblk_t *mp, ts_label_t *tsl)
2245 {
2246 icmp6_t icmp6;
2247
2248 icmp6.icmp6_type = ICMP6_PACKET_TOO_BIG;
2249 icmp6.icmp6_code = 0;
2250 icmp6.icmp6_mtu = htonl(newmtu);
2251
2252 iptun_sendicmp_v6(iptun, &icmp6, orig_ip6h, mp, tsl);
2253 }
2254
2255 /*
2256 * Determines if the packet pointed to by ipha or ip6h is an ICMP error. The
2257 * mp argument is only used to do bounds checking.
2258 */
2259 static boolean_t
2260 is_icmp_error(mblk_t *mp, ipha_t *ipha, ip6_t *ip6h)
2261 {
2262 uint16_t hlen;
2263
2264 if (ipha != NULL) {
2265 icmph_t *icmph;
2266
2267 ASSERT(ip6h == NULL);
2268 if (ipha->ipha_protocol != IPPROTO_ICMP)
2269 return (B_FALSE);
2270
2271 hlen = IPH_HDR_LENGTH(ipha);
2272 icmph = (icmph_t *)((uint8_t *)ipha + hlen);
2273 return (ICMP_IS_ERROR(icmph->icmph_type) ||
2274 icmph->icmph_type == ICMP_REDIRECT);
2275 } else {
2276 icmp6_t *icmp6;
2277 uint8_t *nexthdrp;
2278
2279 ASSERT(ip6h != NULL);
2280 if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &hlen, &nexthdrp) ||
2281 *nexthdrp != IPPROTO_ICMPV6) {
2282 return (B_FALSE);
2283 }
2284
2285 icmp6 = (icmp6_t *)((uint8_t *)ip6h + hlen);
2286 return (ICMP6_IS_ERROR(icmp6->icmp6_type) ||
2287 icmp6->icmp6_type == ND_REDIRECT);
2288 }
2289 }
2290
2291 /*
2292 * Find inner and outer IP headers from a tunneled packet as setup for calls
2293 * into ipsec_tun_{in,out}bound().
2294 * Note that we need to allow the outer header to be in a separate mblk from
2295 * the inner header.
2296 * If the caller knows the outer_hlen, the caller passes it in. Otherwise zero.
2297 */
2298 static size_t
2299 iptun_find_headers(mblk_t *mp, size_t outer_hlen, ipha_t **outer4,
2300 ipha_t **inner4, ip6_t **outer6, ip6_t **inner6)
2301 {
2302 ipha_t *ipha;
2303 size_t first_mblkl = MBLKL(mp);
2304 mblk_t *inner_mp;
2305
2306 /*
2307 * Don't bother handling packets that don't have a full IP header in
2308 * the fist mblk. For the input path, the ip module ensures that this
2309 * won't happen, and on the output path, the IP tunneling MAC-type
2310 * plugins ensure that this also won't happen.
2311 */
2312 if (first_mblkl < sizeof (ipha_t))
2313 return (0);
2314 ipha = (ipha_t *)(mp->b_rptr);
2315 switch (IPH_HDR_VERSION(ipha)) {
2316 case IPV4_VERSION:
2317 *outer4 = ipha;
2318 *outer6 = NULL;
2319 if (outer_hlen == 0)
2320 outer_hlen = IPH_HDR_LENGTH(ipha);
2321 break;
2322 case IPV6_VERSION:
2323 *outer4 = NULL;
2324 *outer6 = (ip6_t *)ipha;
2325 if (outer_hlen == 0)
2326 outer_hlen = ip_hdr_length_v6(mp, (ip6_t *)ipha);
2327 break;
2328 default:
2329 return (0);
2330 }
2331
2332 if (first_mblkl < outer_hlen ||
2333 (first_mblkl == outer_hlen && mp->b_cont == NULL))
2334 return (0);
2335
2336 /*
2337 * We don't bother doing a pullup here since the outer header will
2338 * just get stripped off soon on input anyway. We just want to ensure
2339 * that the inner* pointer points to a full header.
2340 */
2341 if (first_mblkl == outer_hlen) {
2342 inner_mp = mp->b_cont;
2343 ipha = (ipha_t *)inner_mp->b_rptr;
2344 } else {
2345 inner_mp = mp;
2346 ipha = (ipha_t *)(mp->b_rptr + outer_hlen);
2347 }
2348 switch (IPH_HDR_VERSION(ipha)) {
2349 case IPV4_VERSION:
2350 if (inner_mp->b_wptr - (uint8_t *)ipha < sizeof (ipha_t))
2351 return (0);
2352 *inner4 = ipha;
2353 *inner6 = NULL;
2354 break;
2355 case IPV6_VERSION:
2356 if (inner_mp->b_wptr - (uint8_t *)ipha < sizeof (ip6_t))
2357 return (0);
2358 *inner4 = NULL;
2359 *inner6 = (ip6_t *)ipha;
2360 break;
2361 default:
2362 return (0);
2363 }
2364
2365 return (outer_hlen);
2366 }
2367
2368 /*
2369 * Received ICMP error in response to an X over IPv4 packet that we
2370 * transmitted.
2371 *
2372 * NOTE: "outer" refers to what's inside the ICMP payload. We will get one of
2373 * the following:
2374 *
2375 * [IPv4(0)][ICMPv4][IPv4(1)][IPv4(2)][ULP]
2376 *
2377 * or
2378 *
2379 * [IPv4(0)][ICMPv4][IPv4(1)][IPv6][ULP]
2380 *
2381 * And "outer4" will get set to IPv4(1), and inner[46] will correspond to
2382 * whatever the very-inner packet is (IPv4(2) or IPv6).
2383 */
2384 static void
2385 iptun_input_icmp_v4(iptun_t *iptun, mblk_t *data_mp, icmph_t *icmph,
2386 ip_recv_attr_t *ira)
2387 {
2388 uint8_t *orig;
2389 ipha_t *outer4, *inner4;
2390 ip6_t *outer6, *inner6;
2391 int outer_hlen;
2392 uint8_t type, code;
2393
2394 ASSERT(data_mp->b_cont == NULL);
2395 /*
2396 * Temporarily move b_rptr forward so that iptun_find_headers() can
2397 * find headers in the ICMP packet payload.
2398 */
2399 orig = data_mp->b_rptr;
2400 data_mp->b_rptr = (uint8_t *)(icmph + 1);
2401 /*
2402 * The ip module ensures that ICMP errors contain at least the
2403 * original IP header (otherwise, the error would never have made it
2404 * here).
2405 */
2406 ASSERT(MBLKL(data_mp) >= 0);
2407 outer_hlen = iptun_find_headers(data_mp, 0, &outer4, &inner4, &outer6,
2408 &inner6);
2409 ASSERT(outer6 == NULL);
2410 data_mp->b_rptr = orig;
2411 if (outer_hlen == 0) {
2412 iptun_drop_pkt(data_mp, &iptun->iptun_ierrors);
2413 return;
2414 }
2415
2416 /* Only ICMP errors due to tunneled packets should reach here. */
2417 ASSERT(outer4->ipha_protocol == IPPROTO_ENCAP ||
2418 outer4->ipha_protocol == IPPROTO_IPV6);
2419
2420 data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp,
2421 inner4, inner6, outer4, outer6, -outer_hlen, iptun->iptun_ns);
2422 if (data_mp == NULL) {
2423 /* Callee did all of the freeing. */
2424 atomic_inc_64(&iptun->iptun_ierrors);
2425 return;
2426 }
2427 /* We should never see reassembled fragment here. */
2428 ASSERT(data_mp->b_next == NULL);
2429
2430 data_mp->b_rptr = (uint8_t *)outer4 + outer_hlen;
2431
2432 /*
2433 * If the original packet being transmitted was itself an ICMP error,
2434 * then drop this packet. We don't want to generate an ICMP error in
2435 * response to an ICMP error.
2436 */
2437 if (is_icmp_error(data_mp, inner4, inner6)) {
2438 iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf);
2439 return;
2440 }
2441
2442 switch (icmph->icmph_type) {
2443 case ICMP_DEST_UNREACHABLE:
2444 type = (inner4 != NULL ? icmph->icmph_type : ICMP6_DST_UNREACH);
2445 switch (icmph->icmph_code) {
2446 case ICMP_FRAGMENTATION_NEEDED: {
2447 uint32_t newmtu;
2448
2449 /*
2450 * We reconcile this with the fact that the tunnel may
2451 * also have IPsec policy by letting iptun_update_mtu
2452 * take care of it.
2453 */
2454 newmtu = iptun_update_mtu(iptun, NULL,
2455 ntohs(icmph->icmph_du_mtu));
2456
2457 if (inner4 != NULL) {
2458 iptun_icmp_fragneeded_v4(iptun, newmtu, inner4,
2459 data_mp, ira->ira_tsl);
2460 } else {
2461 iptun_icmp_toobig_v6(iptun, newmtu, inner6,
2462 data_mp, ira->ira_tsl);
2463 }
2464 return;
2465 }
2466 case ICMP_DEST_NET_UNREACH_ADMIN:
2467 case ICMP_DEST_HOST_UNREACH_ADMIN:
2468 code = (inner4 != NULL ? ICMP_DEST_NET_UNREACH_ADMIN :
2469 ICMP6_DST_UNREACH_ADMIN);
2470 break;
2471 default:
2472 code = (inner4 != NULL ? ICMP_HOST_UNREACHABLE :
2473 ICMP6_DST_UNREACH_ADDR);
2474 break;
2475 }
2476 break;
2477 case ICMP_TIME_EXCEEDED:
2478 if (inner6 != NULL) {
2479 type = ICMP6_TIME_EXCEEDED;
2480 code = 0;
2481 } /* else we're already set. */
2482 break;
2483 case ICMP_PARAM_PROBLEM:
2484 /*
2485 * This is a problem with the outer header we transmitted.
2486 * Treat this as an output error.
2487 */
2488 iptun_drop_pkt(data_mp, &iptun->iptun_oerrors);
2489 return;
2490 default:
2491 iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf);
2492 return;
2493 }
2494
2495 if (inner4 != NULL) {
2496 iptun_icmp_error_v4(iptun, inner4, data_mp, type, code,
2497 ira->ira_tsl);
2498 } else {
2499 iptun_icmp_error_v6(iptun, inner6, data_mp, type, code, 0,
2500 ira->ira_tsl);
2501 }
2502 }
2503
2504 /*
2505 * Return B_TRUE if the IPv6 packet pointed to by ip6h contains a Tunnel
2506 * Encapsulation Limit destination option. If there is one, set encaplim_ptr
2507 * to point to the option value.
2508 */
2509 static boolean_t
2510 iptun_find_encaplimit(mblk_t *mp, ip6_t *ip6h, uint8_t **encaplim_ptr)
2511 {
2512 ip_pkt_t pkt;
2513 uint8_t *endptr;
2514 ip6_dest_t *destp;
2515 struct ip6_opt *optp;
2516
2517 pkt.ipp_fields = 0; /* must be initialized */
2518 (void) ip_find_hdr_v6(mp, ip6h, B_FALSE, &pkt, NULL);
2519 if ((pkt.ipp_fields & IPPF_DSTOPTS) != 0) {
2520 destp = pkt.ipp_dstopts;
2521 } else if ((pkt.ipp_fields & IPPF_RTHDRDSTOPTS) != 0) {
2522 destp = pkt.ipp_rthdrdstopts;
2523 } else {
2524 return (B_FALSE);
2525 }
2526
2527 endptr = (uint8_t *)destp + 8 * (destp->ip6d_len + 1);
2528 optp = (struct ip6_opt *)(destp + 1);
2529 while (endptr - (uint8_t *)optp > sizeof (*optp)) {
2530 if (optp->ip6o_type == IP6OPT_TUNNEL_LIMIT) {
2531 if ((uint8_t *)(optp + 1) >= endptr)
2532 return (B_FALSE);
2533 *encaplim_ptr = (uint8_t *)&optp[1];
2534 return (B_TRUE);
2535 }
2536 optp = (struct ip6_opt *)((uint8_t *)optp + optp->ip6o_len + 2);
2537 }
2538 return (B_FALSE);
2539 }
2540
2541 /*
2542 * Received ICMPv6 error in response to an X over IPv6 packet that we
2543 * transmitted.
2544 *
2545 * NOTE: "outer" refers to what's inside the ICMP payload. We will get one of
2546 * the following:
2547 *
2548 * [IPv6(0)][ICMPv6][IPv6(1)][IPv4][ULP]
2549 *
2550 * or
2551 *
2552 * [IPv6(0)][ICMPv6][IPv6(1)][IPv6(2)][ULP]
2553 *
2554 * And "outer6" will get set to IPv6(1), and inner[46] will correspond to
2555 * whatever the very-inner packet is (IPv4 or IPv6(2)).
2556 */
2557 static void
2558 iptun_input_icmp_v6(iptun_t *iptun, mblk_t *data_mp, icmp6_t *icmp6h,
2559 ip_recv_attr_t *ira)
2560 {
2561 uint8_t *orig;
2562 ipha_t *outer4, *inner4;
2563 ip6_t *outer6, *inner6;
2564 int outer_hlen;
2565 uint8_t type, code;
2566
2567 ASSERT(data_mp->b_cont == NULL);
2568
2569 /*
2570 * Temporarily move b_rptr forward so that iptun_find_headers() can
2571 * find IP headers in the ICMP packet payload.
2572 */
2573 orig = data_mp->b_rptr;
2574 data_mp->b_rptr = (uint8_t *)(icmp6h + 1);
2575 /*
2576 * The ip module ensures that ICMP errors contain at least the
2577 * original IP header (otherwise, the error would never have made it
2578 * here).
2579 */
2580 ASSERT(MBLKL(data_mp) >= 0);
2581 outer_hlen = iptun_find_headers(data_mp, 0, &outer4, &inner4, &outer6,
2582 &inner6);
2583 ASSERT(outer4 == NULL);
2584 data_mp->b_rptr = orig; /* Restore r_ptr */
2585 if (outer_hlen == 0) {
2586 iptun_drop_pkt(data_mp, &iptun->iptun_ierrors);
2587 return;
2588 }
2589
2590 data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp,
2591 inner4, inner6, outer4, outer6, -outer_hlen, iptun->iptun_ns);
2592 if (data_mp == NULL) {
2593 /* Callee did all of the freeing. */
2594 atomic_inc_64(&iptun->iptun_ierrors);
2595 return;
2596 }
2597 /* We should never see reassembled fragment here. */
2598 ASSERT(data_mp->b_next == NULL);
2599
2600 data_mp->b_rptr = (uint8_t *)outer6 + outer_hlen;
2601
2602 /*
2603 * If the original packet being transmitted was itself an ICMP error,
2604 * then drop this packet. We don't want to generate an ICMP error in
2605 * response to an ICMP error.
2606 */
2607 if (is_icmp_error(data_mp, inner4, inner6)) {
2608 iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf);
2609 return;
2610 }
2611
2612 switch (icmp6h->icmp6_type) {
2613 case ICMP6_PARAM_PROB: {
2614 uint8_t *encaplim_ptr;
2615
2616 /*
2617 * If the ICMPv6 error points to a valid Tunnel Encapsulation
2618 * Limit option and the limit value is 0, then fall through
2619 * and send a host unreachable message. Otherwise, treat the
2620 * error as an output error, as there must have been a problem
2621 * with a packet we sent.
2622 */
2623 if (!iptun_find_encaplimit(data_mp, outer6, &encaplim_ptr) ||
2624 (icmp6h->icmp6_pptr !=
2625 ((ptrdiff_t)encaplim_ptr - (ptrdiff_t)outer6)) ||
2626 *encaplim_ptr != 0) {
2627 iptun_drop_pkt(data_mp, &iptun->iptun_oerrors);
2628 return;
2629 }
2630 /* FALLTHRU */
2631 }
2632 case ICMP6_TIME_EXCEEDED:
2633 case ICMP6_DST_UNREACH:
2634 type = (inner4 != NULL ? ICMP_DEST_UNREACHABLE :
2635 ICMP6_DST_UNREACH);
2636 code = (inner4 != NULL ? ICMP_HOST_UNREACHABLE :
2637 ICMP6_DST_UNREACH_ADDR);
2638 break;
2639 case ICMP6_PACKET_TOO_BIG: {
2640 uint32_t newmtu;
2641
2642 /*
2643 * We reconcile this with the fact that the tunnel may also
2644 * have IPsec policy by letting iptun_update_mtu take care of
2645 * it.
2646 */
2647 newmtu = iptun_update_mtu(iptun, NULL,
2648 ntohl(icmp6h->icmp6_mtu));
2649
2650 if (inner4 != NULL) {
2651 iptun_icmp_fragneeded_v4(iptun, newmtu, inner4,
2652 data_mp, ira->ira_tsl);
2653 } else {
2654 iptun_icmp_toobig_v6(iptun, newmtu, inner6, data_mp,
2655 ira->ira_tsl);
2656 }
2657 return;
2658 }
2659 default:
2660 iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf);
2661 return;
2662 }
2663
2664 if (inner4 != NULL) {
2665 iptun_icmp_error_v4(iptun, inner4, data_mp, type, code,
2666 ira->ira_tsl);
2667 } else {
2668 iptun_icmp_error_v6(iptun, inner6, data_mp, type, code, 0,
2669 ira->ira_tsl);
2670 }
2671 }
2672
2673 /*
2674 * Called as conn_recvicmp from IP for ICMP errors.
2675 */
2676 /* ARGSUSED2 */
2677 static void
2678 iptun_input_icmp(void *arg, mblk_t *mp, void *arg2, ip_recv_attr_t *ira)
2679 {
2680 conn_t *connp = arg;
2681 iptun_t *iptun = connp->conn_iptun;
2682 mblk_t *tmpmp;
2683 size_t hlen;
2684
2685 ASSERT(IPCL_IS_IPTUN(connp));
2686
2687 if (mp->b_cont != NULL) {
2688 /*
2689 * Since ICMP error processing necessitates access to bits
2690 * that are within the ICMP error payload (the original packet
2691 * that caused the error), pull everything up into a single
2692 * block for convenience.
2693 */
2694 if ((tmpmp = msgpullup(mp, -1)) == NULL) {
2695 iptun_drop_pkt(mp, &iptun->iptun_norcvbuf);
2696 return;
2697 }
2698 freemsg(mp);
2699 mp = tmpmp;
2700 }
2701
2702 hlen = ira->ira_ip_hdr_length;
2703 switch (iptun->iptun_typeinfo->iti_ipvers) {
2704 case IPV4_VERSION:
2705 /*
2706 * The outer IP header coming up from IP is always ipha_t
2707 * alligned (otherwise, we would have crashed in ip).
2708 */
2709 iptun_input_icmp_v4(iptun, mp, (icmph_t *)(mp->b_rptr + hlen),
2710 ira);
2711 break;
2712 case IPV6_VERSION:
2713 iptun_input_icmp_v6(iptun, mp, (icmp6_t *)(mp->b_rptr + hlen),
2714 ira);
2715 break;
2716 }
2717 }
2718
2719 static boolean_t
2720 iptun_in_6to4_ok(iptun_t *iptun, ipha_t *outer4, ip6_t *inner6)
2721 {
2722 ipaddr_t v4addr;
2723
2724 /*
2725 * It's possible that someone sent us an IPv4-in-IPv4 packet with the
2726 * IPv4 address of a 6to4 tunnel as the destination.
2727 */
2728 if (inner6 == NULL)
2729 return (B_FALSE);
2730
2731 /*
2732 * Make sure that the IPv6 destination is within the site that this
2733 * 6to4 tunnel is routing for. We don't want people bouncing random
2734 * tunneled IPv6 packets through this 6to4 router.
2735 */
2736 IN6_6TO4_TO_V4ADDR(&inner6->ip6_dst, (struct in_addr *)&v4addr);
2737 if (outer4->ipha_dst != v4addr)
2738 return (B_FALSE);
2739
2740 if (IN6_IS_ADDR_6TO4(&inner6->ip6_src)) {
2741 /*
2742 * Section 9 of RFC 3056 (security considerations) suggests
2743 * that when a packet is from a 6to4 site (i.e., it's not a
2744 * global address being forwarded froma relay router), make
2745 * sure that the packet was tunneled by that site's 6to4
2746 * router.
2747 */
2748 IN6_6TO4_TO_V4ADDR(&inner6->ip6_src, (struct in_addr *)&v4addr);
2749 if (outer4->ipha_src != v4addr)
2750 return (B_FALSE);
2751 } else {
2752 /*
2753 * Only accept packets from a relay router if we've configured
2754 * outbound relay router functionality.
2755 */
2756 if (iptun->iptun_iptuns->iptuns_relay_rtr_addr == INADDR_ANY)
2757 return (B_FALSE);
2758 }
2759
2760 return (B_TRUE);
2761 }
2762
2763 /*
2764 * Input function for everything that comes up from the ip module below us.
2765 * This is called directly from the ip module via connp->conn_recv().
2766 *
2767 * We receive M_DATA messages with IP-in-IP tunneled packets.
2768 */
2769 /* ARGSUSED2 */
2770 static void
2771 iptun_input(void *arg, mblk_t *data_mp, void *arg2, ip_recv_attr_t *ira)
2772 {
2773 conn_t *connp = arg;
2774 iptun_t *iptun = connp->conn_iptun;
2775 int outer_hlen;
2776 ipha_t *outer4, *inner4;
2777 ip6_t *outer6, *inner6;
2778
2779 ASSERT(IPCL_IS_IPTUN(connp));
2780 ASSERT(DB_TYPE(data_mp) == M_DATA);
2781
2782 outer_hlen = iptun_find_headers(data_mp, ira->ira_ip_hdr_length,
2783 &outer4, &inner4, &outer6, &inner6);
2784 if (outer_hlen == 0)
2785 goto drop;
2786
2787 /*
2788 * If the system is labeled, we call tsol_check_dest() on the packet
2789 * destination (our local tunnel address) to ensure that the packet as
2790 * labeled should be allowed to be sent to us. We don't need to call
2791 * the more involved tsol_receive_local() since the tunnel link itself
2792 * cannot be assigned to shared-stack non-global zones.
2793 */
2794 if (ira->ira_flags & IRAF_SYSTEM_LABELED) {
2795 if (ira->ira_tsl == NULL)
2796 goto drop;
2797 if (tsol_check_dest(ira->ira_tsl, (outer4 != NULL ?
2798 (void *)&outer4->ipha_dst : (void *)&outer6->ip6_dst),
2799 (outer4 != NULL ? IPV4_VERSION : IPV6_VERSION),
2800 CONN_MAC_DEFAULT, B_FALSE, NULL) != 0)
2801 goto drop;
2802 }
2803
2804 data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp,
2805 inner4, inner6, outer4, outer6, outer_hlen, iptun->iptun_ns);
2806 if (data_mp == NULL) {
2807 /* Callee did all of the freeing. */
2808 return;
2809 }
2810
2811 if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4 &&
2812 !iptun_in_6to4_ok(iptun, outer4, inner6))
2813 goto drop;
2814
2815 /*
2816 * We need to statistically account for each packet individually, so
2817 * we might as well split up any b_next chains here.
2818 */
2819 do {
2820 mblk_t *mp;
2821
2822 mp = data_mp->b_next;
2823 data_mp->b_next = NULL;
2824
2825 atomic_inc_64(&iptun->iptun_ipackets);
2826 atomic_add_64(&iptun->iptun_rbytes, msgdsize(data_mp));
2827 mac_rx(iptun->iptun_mh, NULL, data_mp);
2828
2829 data_mp = mp;
2830 } while (data_mp != NULL);
2831 return;
2832 drop:
2833 iptun_drop_pkt(data_mp, &iptun->iptun_ierrors);
2834 }
2835
2836 /*
2837 * Do 6to4-specific header-processing on output. Return B_TRUE if the packet
2838 * was processed without issue, or B_FALSE if the packet had issues and should
2839 * be dropped.
2840 */
2841 static boolean_t
2842 iptun_out_process_6to4(iptun_t *iptun, ipha_t *outer4, ip6_t *inner6)
2843 {
2844 ipaddr_t v4addr;
2845
2846 /*
2847 * IPv6 source must be a 6to4 address. This is because a conscious
2848 * decision was made to not allow a Solaris system to be used as a
2849 * relay router (for security reasons) when 6to4 was initially
2850 * integrated. If this decision is ever reversed, the following check
2851 * can be removed.
2852 */
2853 if (!IN6_IS_ADDR_6TO4(&inner6->ip6_src))
2854 return (B_FALSE);
2855
2856 /*
2857 * RFC3056 mandates that the IPv4 source MUST be set to the IPv4
2858 * portion of the 6to4 IPv6 source address. In other words, make sure
2859 * that we're tunneling packets from our own 6to4 site.
2860 */
2861 IN6_6TO4_TO_V4ADDR(&inner6->ip6_src, (struct in_addr *)&v4addr);
2862 if (outer4->ipha_src != v4addr)
2863 return (B_FALSE);
2864
2865 /*
2866 * Automatically set the destination of the outer IPv4 header as
2867 * described in RFC3056. There are two possibilities:
2868 *
2869 * a. If the IPv6 destination is a 6to4 address, set the IPv4 address
2870 * to the IPv4 portion of the 6to4 address.
2871 * b. If the IPv6 destination is a native IPv6 address, set the IPv4
2872 * destination to the address of a relay router.
2873 *
2874 * Design Note: b shouldn't be necessary here, and this is a flaw in
2875 * the design of the 6to4relay command. Instead of setting a 6to4
2876 * relay address in this module via an ioctl, the 6to4relay command
2877 * could simply add a IPv6 route for native IPv6 addresses (such as a
2878 * default route) in the forwarding table that uses a 6to4 destination
2879 * as its next hop, and the IPv4 portion of that address could be a
2880 * 6to4 relay address. In order for this to work, IP would have to
2881 * resolve the next hop address, which would necessitate a link-layer
2882 * address resolver for 6to4 links, which doesn't exist today.
2883 *
2884 * In fact, if a resolver existed for 6to4 links, then setting the
2885 * IPv4 destination in the outer header could be done as part of
2886 * link-layer address resolution and fast-path header generation, and
2887 * not here.
2888 */
2889 if (IN6_IS_ADDR_6TO4(&inner6->ip6_dst)) {
2890 /* destination is a 6to4 router */
2891 IN6_6TO4_TO_V4ADDR(&inner6->ip6_dst,
2892 (struct in_addr *)&outer4->ipha_dst);
2893
2894 /* Reject attempts to send to INADDR_ANY */
2895 if (outer4->ipha_dst == INADDR_ANY)
2896 return (B_FALSE);
2897 } else {
2898 /*
2899 * The destination is a native IPv6 address. If output to a
2900 * relay-router is enabled, use the relay-router's IPv4
2901 * address as the destination.
2902 */
2903 if (iptun->iptun_iptuns->iptuns_relay_rtr_addr == INADDR_ANY)
2904 return (B_FALSE);
2905 outer4->ipha_dst = iptun->iptun_iptuns->iptuns_relay_rtr_addr;
2906 }
2907
2908 /*
2909 * If the outer source and destination are equal, this means that the
2910 * 6to4 router somehow forwarded an IPv6 packet destined for its own
2911 * 6to4 site to its 6to4 tunnel interface, which will result in this
2912 * packet infinitely bouncing between ip and iptun.
2913 */
2914 return (outer4->ipha_src != outer4->ipha_dst);
2915 }
2916
2917 /*
2918 * Process output packets with outer IPv4 headers. Frees mp and bumps stat on
2919 * error.
2920 */
2921 static mblk_t *
2922 iptun_out_process_ipv4(iptun_t *iptun, mblk_t *mp, ipha_t *outer4,
2923 ipha_t *inner4, ip6_t *inner6, ip_xmit_attr_t *ixa)
2924 {
2925 uint8_t *innerptr = (inner4 != NULL ?
2926 (uint8_t *)inner4 : (uint8_t *)inner6);
2927 size_t minmtu = iptun->iptun_typeinfo->iti_minmtu;
2928
2929 if (inner4 != NULL) {
2930 ASSERT(outer4->ipha_protocol == IPPROTO_ENCAP);
2931 /*
2932 * Copy the tos from the inner IPv4 header. We mask off ECN
2933 * bits (bits 6 and 7) because there is currently no
2934 * tunnel-tunnel communication to determine if both sides
2935 * support ECN. We opt for the safe choice: don't copy the
2936 * ECN bits when doing encapsulation.
2937 */
2938 outer4->ipha_type_of_service =
2939 inner4->ipha_type_of_service & ~0x03;
2940 } else {
2941 ASSERT(outer4->ipha_protocol == IPPROTO_IPV6 &&
2942 inner6 != NULL);
2943 }
2944 if (ixa->ixa_flags & IXAF_PMTU_IPV4_DF)
2945 outer4->ipha_fragment_offset_and_flags |= IPH_DF_HTONS;
2946 else
2947 outer4->ipha_fragment_offset_and_flags &= ~IPH_DF_HTONS;
2948
2949 /*
2950 * As described in section 3.2.2 of RFC4213, if the packet payload is
2951 * less than or equal to the minimum MTU size, then we need to allow
2952 * IPv4 to fragment the packet. The reason is that even if we end up
2953 * receiving an ICMP frag-needed, the interface above this tunnel
2954 * won't be allowed to drop its MTU as a result, since the packet was
2955 * already smaller than the smallest allowable MTU for that interface.
2956 */
2957 if (mp->b_wptr - innerptr <= minmtu) {
2958 outer4->ipha_fragment_offset_and_flags = 0;
2959 ixa->ixa_flags &= ~IXAF_DONTFRAG;
2960 } else if (!(ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) &&
2961 (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4)) {
2962 ixa->ixa_flags |= IXAF_DONTFRAG;
2963 }
2964
2965 ixa->ixa_ip_hdr_length = IPH_HDR_LENGTH(outer4);
2966 ixa->ixa_pktlen = msgdsize(mp);
2967 ixa->ixa_protocol = outer4->ipha_protocol;
2968
2969 outer4->ipha_length = htons(ixa->ixa_pktlen);
2970 return (mp);
2971 }
2972
2973 /*
2974 * Insert an encapsulation limit destination option in the packet provided.
2975 * Always consumes the mp argument and returns a new mblk pointer.
2976 */
2977 static mblk_t *
2978 iptun_insert_encaplimit(iptun_t *iptun, mblk_t *mp, ip6_t *outer6,
2979 uint8_t limit)
2980 {
2981 mblk_t *newmp;
2982 iptun_ipv6hdrs_t *newouter6;
2983
2984 ASSERT(outer6->ip6_nxt == IPPROTO_IPV6);
2985 ASSERT(mp->b_cont == NULL);
2986
2987 mp->b_rptr += sizeof (ip6_t);
2988 newmp = allocb(sizeof (iptun_ipv6hdrs_t) + MBLKL(mp), BPRI_MED);
2989 if (newmp == NULL) {
2990 iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf);
2991 return (NULL);
2992 }
2993 newmp->b_wptr += sizeof (iptun_ipv6hdrs_t);
2994 /* Copy the payload (Starting with the inner IPv6 header). */
2995 bcopy(mp->b_rptr, newmp->b_wptr, MBLKL(mp));
2996 newmp->b_wptr += MBLKL(mp);
2997 newouter6 = (iptun_ipv6hdrs_t *)newmp->b_rptr;
2998 /* Now copy the outer IPv6 header. */
2999 bcopy(outer6, &newouter6->it6h_ip6h, sizeof (ip6_t));
3000 newouter6->it6h_ip6h.ip6_nxt = IPPROTO_DSTOPTS;
3001 newouter6->it6h_encaplim = iptun_encaplim_init;
3002 newouter6->it6h_encaplim.iel_destopt.ip6d_nxt = outer6->ip6_nxt;
3003 newouter6->it6h_encaplim.iel_telopt.ip6ot_encap_limit = limit;
3004
3005 /*
3006 * The payload length will be set at the end of
3007 * iptun_out_process_ipv6().
3008 */
3009
3010 freemsg(mp);
3011 return (newmp);
3012 }
3013
3014 /*
3015 * Process output packets with outer IPv6 headers. Frees mp and bumps stats
3016 * on error.
3017 */
3018 static mblk_t *
3019 iptun_out_process_ipv6(iptun_t *iptun, mblk_t *mp, ip6_t *outer6,
3020 ipha_t *inner4, ip6_t *inner6, ip_xmit_attr_t *ixa)
3021 {
3022 uint8_t *innerptr = (inner4 != NULL ?
3023 (uint8_t *)inner4 : (uint8_t *)inner6);
3024 size_t minmtu = iptun->iptun_typeinfo->iti_minmtu;
3025 uint8_t *limit, *configlimit;
3026 uint32_t offset;
3027 iptun_ipv6hdrs_t *v6hdrs;
3028
3029 if (inner6 != NULL && iptun_find_encaplimit(mp, inner6, &limit)) {
3030 /*
3031 * The inner packet is an IPv6 packet which itself contains an
3032 * encapsulation limit option. The limit variable points to
3033 * the value in the embedded option. Process the
3034 * encapsulation limit option as specified in RFC 2473.
3035 *
3036 * If limit is 0, then we've exceeded the limit and we need to
3037 * send back an ICMPv6 parameter problem message.
3038 *
3039 * If limit is > 0, then we decrement it by 1 and make sure
3040 * that the encapsulation limit option in the outer header
3041 * reflects that (adding an option if one isn't already
3042 * there).
3043 */
3044 ASSERT(limit > mp->b_rptr && limit < mp->b_wptr);
3045 if (*limit == 0) {
3046 mp->b_rptr = (uint8_t *)inner6;
3047 offset = limit - mp->b_rptr;
3048 iptun_icmp_error_v6(iptun, inner6, mp, ICMP6_PARAM_PROB,
3049 0, offset, ixa->ixa_tsl);
3050 atomic_inc_64(&iptun->iptun_noxmtbuf);
3051 return (NULL);
3052 }
3053
3054 /*
3055 * The outer header requires an encapsulation limit option.
3056 * If there isn't one already, add one.
3057 */
3058 if (iptun->iptun_encaplimit == 0) {
3059 if ((mp = iptun_insert_encaplimit(iptun, mp, outer6,
3060 (*limit - 1))) == NULL)
3061 return (NULL);
3062 v6hdrs = (iptun_ipv6hdrs_t *)mp->b_rptr;
3063 } else {
3064 /*
3065 * There is an existing encapsulation limit option in
3066 * the outer header. If the inner encapsulation limit
3067 * is less than the configured encapsulation limit,
3068 * update the outer encapsulation limit to reflect
3069 * this lesser value.
3070 */
3071 v6hdrs = (iptun_ipv6hdrs_t *)mp->b_rptr;
3072 configlimit =
3073 &v6hdrs->it6h_encaplim.iel_telopt.ip6ot_encap_limit;
3074 if ((*limit - 1) < *configlimit)
3075 *configlimit = (*limit - 1);
3076 }
3077 ixa->ixa_ip_hdr_length = sizeof (iptun_ipv6hdrs_t);
3078 ixa->ixa_protocol = v6hdrs->it6h_encaplim.iel_destopt.ip6d_nxt;
3079 } else {
3080 ixa->ixa_ip_hdr_length = sizeof (ip6_t);
3081 ixa->ixa_protocol = outer6->ip6_nxt;
3082 }
3083 /*
3084 * See iptun_output_process_ipv4() why we allow fragmentation for
3085 * small packets
3086 */
3087 if (mp->b_wptr - innerptr <= minmtu)
3088 ixa->ixa_flags &= ~IXAF_DONTFRAG;
3089 else if (!(ixa->ixa_flags & IXAF_PMTU_TOO_SMALL))
3090 ixa->ixa_flags |= IXAF_DONTFRAG;
3091
3092 ixa->ixa_pktlen = msgdsize(mp);
3093 outer6->ip6_plen = htons(ixa->ixa_pktlen - sizeof (ip6_t));
3094 return (mp);
3095 }
3096
3097 /*
3098 * The IP tunneling MAC-type plugins have already done most of the header
3099 * processing and validity checks. We are simply responsible for multiplexing
3100 * down to the ip module below us.
3101 */
3102 static void
3103 iptun_output(iptun_t *iptun, mblk_t *mp)
3104 {
3105 conn_t *connp = iptun->iptun_connp;
3106 mblk_t *newmp;
3107 int error;
3108 ip_xmit_attr_t *ixa;
3109
3110 ASSERT(mp->b_datap->db_type == M_DATA);
3111
3112 if (mp->b_cont != NULL) {
3113 if ((newmp = msgpullup(mp, -1)) == NULL) {
3114 iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf);
3115 return;
3116 }
3117 freemsg(mp);
3118 mp = newmp;
3119 }
3120
3121 if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4) {
3122 iptun_output_6to4(iptun, mp);
3123 return;
3124 }
3125
3126 if (is_system_labeled()) {
3127 /*
3128 * Since the label can be different meaning a potentially
3129 * different IRE,we always use a unique ip_xmit_attr_t.
3130 */
3131 ixa = conn_get_ixa_exclusive(connp);
3132 } else {
3133 /*
3134 * If no other thread is using conn_ixa this just gets a
3135 * reference to conn_ixa. Otherwise we get a safe copy of
3136 * conn_ixa.
3137 */
3138 ixa = conn_get_ixa(connp, B_FALSE);
3139 }
3140 if (ixa == NULL) {
3141 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3142 return;
3143 }
3144
3145 /*
3146 * In case we got a safe copy of conn_ixa, then we need
3147 * to fill in any pointers in it.
3148 */
3149 if (ixa->ixa_ire == NULL) {
3150 error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6,
3151 &connp->conn_faddr_v6, &connp->conn_faddr_v6, 0,
3152 NULL, NULL, 0);
3153 if (error != 0) {
3154 if (ixa->ixa_ire != NULL &&
3155 (error == EHOSTUNREACH || error == ENETUNREACH)) {
3156 /*
3157 * Let conn_ip_output/ire_send_noroute return
3158 * the error and send any local ICMP error.
3159 */
3160 error = 0;
3161 } else {
3162 ixa_refrele(ixa);
3163 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3164 return;
3165 }
3166 }
3167 }
3168
3169 iptun_output_common(iptun, ixa, mp);
3170 ixa_refrele(ixa);
3171 }
3172
3173 /*
3174 * We use an ixa based on the last destination.
3175 */
3176 static void
3177 iptun_output_6to4(iptun_t *iptun, mblk_t *mp)
3178 {
3179 conn_t *connp = iptun->iptun_connp;
3180 ipha_t *outer4, *inner4;
3181 ip6_t *outer6, *inner6;
3182 ip_xmit_attr_t *ixa;
3183 ip_xmit_attr_t *oldixa;
3184 int error;
3185 boolean_t need_connect;
3186 in6_addr_t v6dst;
3187
3188 ASSERT(mp->b_cont == NULL); /* Verified by iptun_output */
3189
3190 /* Make sure we set ipha_dst before we look at ipha_dst */
3191
3192 (void) iptun_find_headers(mp, 0, &outer4, &inner4, &outer6, &inner6);
3193 ASSERT(outer4 != NULL);
3194 if (!iptun_out_process_6to4(iptun, outer4, inner6)) {
3195 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3196 return;
3197 }
3198
3199 if (is_system_labeled()) {
3200 /*
3201 * Since the label can be different meaning a potentially
3202 * different IRE,we always use a unique ip_xmit_attr_t.
3203 */
3204 ixa = conn_get_ixa_exclusive(connp);
3205 } else {
3206 /*
3207 * If no other thread is using conn_ixa this just gets a
3208 * reference to conn_ixa. Otherwise we get a safe copy of
3209 * conn_ixa.
3210 */
3211 ixa = conn_get_ixa(connp, B_FALSE);
3212 }
3213 if (ixa == NULL) {
3214 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3215 return;
3216 }
3217
3218 mutex_enter(&connp->conn_lock);
3219 if (connp->conn_v4lastdst == outer4->ipha_dst) {
3220 need_connect = (ixa->ixa_ire == NULL);
3221 } else {
3222 /* In case previous destination was multirt */
3223 ip_attr_newdst(ixa);
3224
3225 /*
3226 * We later update conn_ixa when we update conn_v4lastdst
3227 * which enables subsequent packets to avoid redoing
3228 * ip_attr_connect
3229 */
3230 need_connect = B_TRUE;
3231 }
3232 mutex_exit(&connp->conn_lock);
3233
3234 /*
3235 * In case we got a safe copy of conn_ixa, or otherwise we don't
3236 * have a current ixa_ire, then we need to fill in any pointers in
3237 * the ixa.
3238 */
3239 if (need_connect) {
3240 IN6_IPADDR_TO_V4MAPPED(outer4->ipha_dst, &v6dst);
3241
3242 /* We handle IPsec in iptun_output_common */
3243 error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6,
3244 &v6dst, &v6dst, 0, NULL, NULL, 0);
3245 if (error != 0) {
3246 if (ixa->ixa_ire != NULL &&
3247 (error == EHOSTUNREACH || error == ENETUNREACH)) {
3248 /*
3249 * Let conn_ip_output/ire_send_noroute return
3250 * the error and send any local ICMP error.
3251 */
3252 error = 0;
3253 } else {
3254 ixa_refrele(ixa);
3255 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3256 return;
3257 }
3258 }
3259 }
3260
3261 iptun_output_common(iptun, ixa, mp);
3262
3263 /* Atomically replace conn_ixa and conn_v4lastdst */
3264 mutex_enter(&connp->conn_lock);
3265 if (connp->conn_v4lastdst != outer4->ipha_dst) {
3266 /* Remember the dst which corresponds to conn_ixa */
3267 connp->conn_v6lastdst = v6dst;
3268 oldixa = conn_replace_ixa(connp, ixa);
3269 } else {
3270 oldixa = NULL;
3271 }
3272 mutex_exit(&connp->conn_lock);
3273 ixa_refrele(ixa);
3274 if (oldixa != NULL)
3275 ixa_refrele(oldixa);
3276 }
3277
3278 /*
3279 * Check the destination/label. Modifies *mpp by adding/removing CIPSO.
3280 *
3281 * We get the label from the message in order to honor the
3282 * ULPs/IPs choice of label. This will be NULL for forwarded
3283 * packets, neighbor discovery packets and some others.
3284 */
3285 static int
3286 iptun_output_check_label(mblk_t **mpp, ip_xmit_attr_t *ixa)
3287 {
3288 cred_t *cr;
3289 int adjust;
3290 int iplen;
3291 int err;
3292 ts_label_t *effective_tsl = NULL;
3293
3294
3295 ASSERT(is_system_labeled());
3296
3297 cr = msg_getcred(*mpp, NULL);
3298 if (cr == NULL)
3299 return (0);
3300
3301 /*
3302 * We need to start with a label based on the IP/ULP above us
3303 */
3304 ip_xmit_attr_restore_tsl(ixa, cr);
3305
3306 /*
3307 * Need to update packet with any CIPSO option since
3308 * conn_ip_output doesn't do that.
3309 */
3310 if (ixa->ixa_flags & IXAF_IS_IPV4) {
3311 ipha_t *ipha;
3312
3313 ipha = (ipha_t *)(*mpp)->b_rptr;
3314 iplen = ntohs(ipha->ipha_length);
3315 err = tsol_check_label_v4(ixa->ixa_tsl,
3316 ixa->ixa_zoneid, mpp, CONN_MAC_DEFAULT, B_FALSE,
3317 ixa->ixa_ipst, &effective_tsl);
3318 if (err != 0)
3319 return (err);
3320
3321 ipha = (ipha_t *)(*mpp)->b_rptr;
3322 adjust = (int)ntohs(ipha->ipha_length) - iplen;
3323 } else {
3324 ip6_t *ip6h;
3325
3326 ip6h = (ip6_t *)(*mpp)->b_rptr;
3327 iplen = ntohs(ip6h->ip6_plen);
3328
3329 err = tsol_check_label_v6(ixa->ixa_tsl,
3330 ixa->ixa_zoneid, mpp, CONN_MAC_DEFAULT, B_FALSE,
3331 ixa->ixa_ipst, &effective_tsl);
3332 if (err != 0)
3333 return (err);
3334
3335 ip6h = (ip6_t *)(*mpp)->b_rptr;
3336 adjust = (int)ntohs(ip6h->ip6_plen) - iplen;
3337 }
3338
3339 if (effective_tsl != NULL) {
3340 /* Update the label */
3341 ip_xmit_attr_replace_tsl(ixa, effective_tsl);
3342 }
3343 ixa->ixa_pktlen += adjust;
3344 ixa->ixa_ip_hdr_length += adjust;
3345 return (0);
3346 }
3347
3348
3349 static void
3350 iptun_output_common(iptun_t *iptun, ip_xmit_attr_t *ixa, mblk_t *mp)
3351 {
3352 ipsec_tun_pol_t *itp = iptun->iptun_itp;
3353 int outer_hlen;
3354 mblk_t *newmp;
3355 ipha_t *outer4, *inner4;
3356 ip6_t *outer6, *inner6;
3357 int error;
3358 boolean_t update_pktlen;
3359
3360 ASSERT(ixa->ixa_ire != NULL);
3361
3362 outer_hlen = iptun_find_headers(mp, 0, &outer4, &inner4, &outer6,
3363 &inner6);
3364 if (outer_hlen == 0) {
3365 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3366 return;
3367 }
3368
3369 /* Save IXAF_DONTFRAG value */
3370 iaflags_t dontfrag = ixa->ixa_flags & IXAF_DONTFRAG;
3371
3372 /* Perform header processing. */
3373 if (outer4 != NULL) {
3374 mp = iptun_out_process_ipv4(iptun, mp, outer4, inner4, inner6,
3375 ixa);
3376 } else {
3377 mp = iptun_out_process_ipv6(iptun, mp, outer6, inner4, inner6,
3378 ixa);
3379 }
3380 if (mp == NULL)
3381 return;
3382
3383 /*
3384 * Let's hope the compiler optimizes this with "branch taken".
3385 */
3386 if (itp != NULL && (itp->itp_flags & ITPF_P_ACTIVE)) {
3387 /* This updates the ip_xmit_attr_t */
3388 mp = ipsec_tun_outbound(mp, iptun, inner4, inner6, outer4,
3389 outer6, outer_hlen, ixa);
3390 if (mp == NULL) {
3391 atomic_inc_64(&iptun->iptun_oerrors);
3392 return;
3393 }
3394 if (is_system_labeled()) {
3395 /*
3396 * Might change the packet by adding/removing CIPSO.
3397 * After this caller inner* and outer* and outer_hlen
3398 * might be invalid.
3399 */
3400 error = iptun_output_check_label(&mp, ixa);
3401 if (error != 0) {
3402 ip2dbg(("label check failed (%d)\n", error));
3403 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3404 return;
3405 }
3406 }
3407
3408 /*
3409 * ipsec_tun_outbound() returns a chain of tunneled IP
3410 * fragments linked with b_next (or a single message if the
3411 * tunneled packet wasn't a fragment).
3412 * If fragcache returned a list then we need to update
3413 * ixa_pktlen for all packets in the list.
3414 */
3415 update_pktlen = (mp->b_next != NULL);
3416
3417 /*
3418 * Otherwise, we're good to go. The ixa has been updated with
3419 * instructions for outbound IPsec processing.
3420 */
3421 for (newmp = mp; newmp != NULL; newmp = mp) {
3422 size_t minmtu = iptun->iptun_typeinfo->iti_minmtu;
3423
3424 atomic_inc_64(&iptun->iptun_opackets);
3425 atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen);
3426 mp = mp->b_next;
3427 newmp->b_next = NULL;
3428
3429 /*
3430 * The IXAF_DONTFRAG flag is global, but there is
3431 * a chain here. Check if we're really already
3432 * smaller than the minimum allowed MTU and reset here
3433 * appropriately. Otherwise one small packet can kill
3434 * the whole chain's path mtu discovery.
3435 * In addition, update the pktlen to the length of
3436 * the actual packet being processed.
3437 */
3438 if (update_pktlen) {
3439 ixa->ixa_pktlen = msgdsize(newmp);
3440 if (ixa->ixa_pktlen <= minmtu)
3441 ixa->ixa_flags &= ~IXAF_DONTFRAG;
3442 }
3443
3444 atomic_inc_64(&iptun->iptun_opackets);
3445 atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen);
3446
3447 error = conn_ip_output(newmp, ixa);
3448
3449 /* Restore IXAF_DONTFRAG value */
3450 ixa->ixa_flags |= dontfrag;
3451
3452 if (error == EMSGSIZE) {
3453 /* IPsec policy might have changed */
3454 (void) iptun_update_mtu(iptun, ixa, 0);
3455 }
3456 }
3457 } else {
3458 /*
3459 * The ip module will potentially apply global policy to the
3460 * packet in its output path if there's no active tunnel
3461 * policy.
3462 */
3463 ASSERT(ixa->ixa_ipsec_policy == NULL);
3464 mp = ip_output_attach_policy(mp, outer4, outer6, NULL, ixa);
3465 if (mp == NULL) {
3466 atomic_inc_64(&iptun->iptun_oerrors);
3467 return;
3468 }
3469 if (is_system_labeled()) {
3470 /*
3471 * Might change the packet by adding/removing CIPSO.
3472 * After this caller inner* and outer* and outer_hlen
3473 * might be invalid.
3474 */
3475 error = iptun_output_check_label(&mp, ixa);
3476 if (error != 0) {
3477 ip2dbg(("label check failed (%d)\n", error));
3478 iptun_drop_pkt(mp, &iptun->iptun_oerrors);
3479 return;
3480 }
3481 }
3482
3483 atomic_inc_64(&iptun->iptun_opackets);
3484 atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen);
3485
3486 error = conn_ip_output(mp, ixa);
3487 if (error == EMSGSIZE) {
3488 /* IPsec policy might have changed */
3489 (void) iptun_update_mtu(iptun, ixa, 0);
3490 }
3491 }
3492 if (ixa->ixa_flags & IXAF_IPSEC_SECURE)
3493 ipsec_out_release_refs(ixa);
3494 }
3495
3496 static mac_callbacks_t iptun_m_callbacks = {
3497 .mc_callbacks = (MC_SETPROP | MC_GETPROP | MC_PROPINFO),
3498 .mc_getstat = iptun_m_getstat,
3499 .mc_start = iptun_m_start,
3500 .mc_stop = iptun_m_stop,
3501 .mc_setpromisc = iptun_m_setpromisc,
3502 .mc_multicst = iptun_m_multicst,
3503 .mc_unicst = iptun_m_unicst,
3504 .mc_tx = iptun_m_tx,
3505 .mc_reserved = NULL,
3506 .mc_setprop = iptun_m_setprop,
3507 .mc_getprop = iptun_m_getprop,
3508 .mc_propinfo = iptun_m_propinfo
3509 };