1 /*
2 * Copyright (c) 2000-2022 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 /*
30 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
31 * All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. Neither the name of the project nor the names of its contributors
42 * may be used to endorse or promote products derived from this software
43 * without specific prior written permission.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 */
57
58 /*
59 * Copyright (c) 1982, 1986, 1991, 1993
60 * The Regents of the University of California. All rights reserved.
61 *
62 * Redistribution and use in source and binary forms, with or without
63 * modification, are permitted provided that the following conditions
64 * are met:
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 * 2. Redistributions in binary form must reproduce the above copyright
68 * notice, this list of conditions and the following disclaimer in the
69 * documentation and/or other materials provided with the distribution.
70 * 3. All advertising materials mentioning features or use of this software
71 * must display the following acknowledgement:
72 * This product includes software developed by the University of
73 * California, Berkeley and its contributors.
74 * 4. Neither the name of the University nor the names of its contributors
75 * may be used to endorse or promote products derived from this software
76 * without specific prior written permission.
77 *
78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
88 * SUCH DAMAGE.
89 *
90 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
91 */
92
93
94 #include <sys/param.h>
95 #include <sys/systm.h>
96 #include <sys/malloc.h>
97 #include <sys/mbuf.h>
98 #include <sys/protosw.h>
99 #include <sys/socket.h>
100 #include <sys/socketvar.h>
101 #include <sys/errno.h>
102 #include <sys/time.h>
103 #include <sys/proc.h>
104 #include <sys/sysctl.h>
105 #include <sys/kauth.h>
106 #include <sys/priv.h>
107 #include <kern/locks.h>
108 #include <sys/random.h>
109
110 #include <net/if.h>
111 #include <net/if_types.h>
112 #include <net/route.h>
113 #include <net/restricted_in_port.h>
114
115 #include <netinet/in.h>
116 #include <netinet/in_var.h>
117 #include <netinet/in_systm.h>
118 #include <netinet/ip.h>
119 #include <netinet/in_pcb.h>
120
121 #include <netinet6/in6_var.h>
122 #include <netinet/ip6.h>
123 #include <netinet6/in6_pcb.h>
124 #include <netinet6/ip6_var.h>
125 #include <netinet6/scope6_var.h>
126 #include <netinet6/nd6.h>
127
128 #include <net/net_osdep.h>
129
130 #include <net/sockaddr_utils.h>
131
132 #include "loop.h"
133
134 SYSCTL_DECL(_net_inet6_ip6);
135
136 static int ip6_select_srcif_debug = 0;
137 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_srcif_debug,
138 CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_srcif_debug, 0,
139 "log source interface selection debug info");
140
141 static int ip6_select_srcaddr_debug = 0;
142 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_srcaddr_debug,
143 CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_srcaddr_debug, 0,
144 "log source address selection debug info");
145
146 static int ip6_select_src_expensive_secondary_if = 0;
147 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_src_expensive_secondary_if,
148 CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_src_expensive_secondary_if, 0,
149 "allow source interface selection to use expensive secondaries");
150
151 static int ip6_select_src_strong_end = 1;
152 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, select_src_strong_end,
153 CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_select_src_strong_end, 0,
154 "limit source address selection to outgoing interface");
155
156 #define ADDR_LABEL_NOTAPP (-1)
157 struct in6_addrpolicy defaultaddrpolicy;
158
159 int ip6_prefer_tempaddr = 1;
160
161 int ip6_cga_conflict_retries = IPV6_CGA_CONFLICT_RETRIES_DEFAULT;
162
163 extern int udp_use_randomport;
164 extern int tcp_use_randomport;
165
166 static int selectroute(struct sockaddr_in6 *, struct sockaddr_in6 *,
167 struct ip6_pktopts *, struct ip6_moptions *, struct in6_ifaddr **,
168 struct route_in6 *, struct ifnet **, struct rtentry **, int, int,
169 struct ip6_out_args *ip6oa);
170 static int in6_selectif(struct sockaddr_in6 *, struct ip6_pktopts *,
171 struct ip6_moptions *, struct route_in6 *ro,
172 struct ip6_out_args *, struct ifnet **);
173 static void init_policy_queue(void);
174 static int add_addrsel_policyent(const struct in6_addrpolicy *);
175 static int walk_addrsel_policy(int (*)(const struct in6_addrpolicy *, void *),
176 void *);
177 static int dump_addrsel_policyent(const struct in6_addrpolicy *, void *);
178 static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
179 void addrsel_policy_init(void);
180
181 #define SASEL_DO_DBG(inp) \
182 (ip6_select_srcaddr_debug && (inp) != NULL && \
183 (inp)->inp_socket != NULL && \
184 ((inp)->inp_socket->so_options & SO_DEBUG))
185
186 #define SASEL_LOG(fmt, ...) \
187 do { \
188 if (srcsel_debug) \
189 os_log(OS_LOG_DEFAULT, "%s:%d " fmt,\
190 __FUNCTION__, __LINE__, ##__VA_ARGS__); \
191 } while (0); \
192
193 /*
194 * Return an IPv6 address, which is the most appropriate for a given
195 * destination and user specified options.
196 * If necessary, this function lookups the routing table and returns
197 * an entry to the caller for later use.
198 */
199 #define REPLACE(r) do {\
200 SASEL_LOG("REPLACE r %s ia %s ifp1 %s\n", \
201 (#r), s_src, ifp1->if_xname); \
202 srcrule = (r); \
203 goto replace; \
204 } while (0)
205
206 #define NEXTSRC(r) do {\
207 SASEL_LOG("NEXTSRC r %s ia %s ifp1 %s\n", \
208 (#r), s_src, ifp1->if_xname); \
209 goto next; /* XXX: we can't use 'continue' here */ \
210 } while (0)
211
212 #define BREAK(r) do { \
213 SASEL_LOG("BREAK r %s ia %s ifp1 %s\n", \
214 (#r), s_src, ifp1->if_xname); \
215 srcrule = (r); \
216 goto out; /* XXX: we can't use 'break' here */ \
217 } while (0)
218
219
220 struct ifaddr *
in6_selectsrc_core_ifa(struct sockaddr_in6 * addr,struct ifnet * ifp,int srcsel_debug)221 in6_selectsrc_core_ifa(struct sockaddr_in6 *addr, struct ifnet *ifp, int srcsel_debug)
222 {
223 int err = 0;
224 struct ifnet *src_ifp = NULL;
225 struct in6_addr src_storage = {};
226 struct in6_addr *in6 = NULL;
227 struct ifaddr *ifa = NULL;
228
229 if ((in6 = in6_selectsrc_core(addr,
230 (ip6_prefer_tempaddr ? IPV6_SRCSEL_HINT_PREFER_TMPADDR : 0),
231 ifp, 0, &src_storage, &src_ifp, &err, &ifa, NULL)) == NULL) {
232 if (err == 0) {
233 err = EADDRNOTAVAIL;
234 }
235 VERIFY(src_ifp == NULL);
236 if (ifa != NULL) {
237 ifa_remref(ifa);
238 ifa = NULL;
239 }
240 goto done;
241 }
242
243 if (src_ifp != ifp) {
244 if (err == 0) {
245 err = ENETUNREACH;
246 }
247 if (ifa != NULL) {
248 ifa_remref(ifa);
249 ifa = NULL;
250 }
251 goto done;
252 }
253
254 VERIFY(ifa != NULL);
255 ifnet_lock_shared(ifp);
256 if ((ifa->ifa_debug & IFD_DETACHING) != 0) {
257 err = EHOSTUNREACH;
258 ifnet_lock_done(ifp);
259 ifa_remref(ifa);
260 ifa = NULL;
261 goto done;
262 }
263 ifnet_lock_done(ifp);
264
265 done:
266 SASEL_LOG("Returned with error: %d", err);
267 if (src_ifp != NULL) {
268 ifnet_release(src_ifp);
269 }
270 return ifa;
271 }
272
273 struct in6_addr *
in6_selectsrc_core(struct sockaddr_in6 * dstsock,uint32_t hint_mask,struct ifnet * ifp,int srcsel_debug,struct in6_addr * src_storage,struct ifnet ** sifp,int * errorp,struct ifaddr ** ifapp,struct route_in6 * ro)274 in6_selectsrc_core(struct sockaddr_in6 *dstsock, uint32_t hint_mask,
275 struct ifnet *ifp, int srcsel_debug, struct in6_addr *src_storage,
276 struct ifnet **sifp, int *errorp, struct ifaddr **ifapp, struct route_in6 *ro)
277 {
278 u_int32_t odstzone;
279 int bestrule = IP6S_SRCRULE_0;
280 struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
281 struct in6_addr dst;
282 struct in6_ifaddr *ia = NULL, *ia_best = NULL;
283 char s_src[MAX_IPv6_STR_LEN] = {0};
284 char s_dst[MAX_IPv6_STR_LEN] = {0};
285 const struct in6_addr *tmp = NULL;
286 int dst_scope = -1, best_scope = -1, best_matchlen = -1;
287 uint64_t secs = net_uptime();
288 struct nd_defrouter *dr = NULL;
289 uint32_t genid = in6_ifaddrlist_genid;
290 VERIFY(dstsock != NULL);
291 VERIFY(src_storage != NULL);
292 VERIFY(ifp != NULL);
293
294 if (sifp != NULL) {
295 *sifp = NULL;
296 }
297
298 if (ifapp != NULL) {
299 *ifapp = NULL;
300 }
301
302 dst = dstsock->sin6_addr; /* make a copy for local operation */
303
304 if (srcsel_debug) {
305 (void) inet_ntop(AF_INET6, &dst, s_dst, sizeof(s_src));
306
307 tmp = &in6addr_any;
308 (void) inet_ntop(AF_INET6, tmp, s_src, sizeof(s_src));
309 os_log(OS_LOG_DEFAULT, "%s out src %s dst %s ifp %s",
310 __func__, s_src, s_dst, ifp->if_xname);
311 }
312
313 *errorp = in6_setscope(&dst, ifp, &odstzone);
314 if (*errorp != 0) {
315 src_storage = NULL;
316 goto done;
317 }
318
319 /*
320 * Determine if the route is an indirect here
321 * and if it is get the default router that would be
322 * used as next hop.
323 * Later in the function it is used to apply rule 5.5 of RFC 6724.
324 */
325 if (ro != NULL && ro->ro_rt != NULL &&
326 (ro->ro_rt->rt_flags & RTF_GATEWAY) &&
327 ro->ro_rt->rt_gateway != NULL) {
328 struct rtentry *rt = ro->ro_rt;
329 lck_mtx_lock(nd6_mutex);
330 dr = defrouter_lookup(NULL,
331 &SIN6(rt->rt_gateway)->sin6_addr, rt->rt_ifp);
332 lck_mtx_unlock(nd6_mutex);
333 }
334
335 lck_rw_lock_shared(&in6_ifaddr_rwlock);
336 addrloop:
337 TAILQ_FOREACH(ia, &in6_ifaddrhead, ia6_link) {
338 int new_scope = -1, new_matchlen = -1;
339 struct in6_addrpolicy *new_policy = NULL;
340 u_int32_t srczone = 0, osrczone, dstzone;
341 struct in6_addr src;
342 struct ifnet *ifp1 = ia->ia_ifp;
343 int srcrule;
344
345 if (srcsel_debug) {
346 (void) inet_ntop(AF_INET6, &ia->ia_addr.sin6_addr,
347 s_src, sizeof(s_src));
348 }
349
350 IFA_LOCK(&ia->ia_ifa);
351
352 /*
353 * Simply skip addresses reserved for CLAT46
354 */
355 if (ia->ia6_flags & IN6_IFF_CLAT46) {
356 SASEL_LOG("NEXT ia %s address on ifp1 %s skipped as it is "
357 "reserved for CLAT46\n", s_src, ifp1->if_xname);
358 goto next;
359 }
360
361 /*
362 * XXX By default we are strong end system and will
363 * limit candidate set of source address to the ones
364 * configured on the outgoing interface.
365 */
366 if (ip6_select_src_strong_end &&
367 ifp1 != ifp) {
368 SASEL_LOG("NEXT ia %s ifp1 %s address is not on outgoing "
369 "interface \n", s_src, ifp1->if_xname);
370 goto next;
371 }
372
373 /*
374 * We'll never take an address that breaks the scope zone
375 * of the destination. We also skip an address if its zone
376 * does not contain the outgoing interface.
377 * XXX: we should probably use sin6_scope_id here.
378 */
379 if (in6_setscope(&dst, ifp1, &dstzone) ||
380 odstzone != dstzone) {
381 SASEL_LOG("NEXT ia %s ifp1 %s odstzone %d != dstzone %d\n",
382 s_src, ifp1->if_xname, odstzone, dstzone);
383 goto next;
384 }
385 src = ia->ia_addr.sin6_addr;
386 if (in6_setscope(&src, ifp, &osrczone) ||
387 in6_setscope(&src, ifp1, &srczone) ||
388 osrczone != srczone) {
389 SASEL_LOG("NEXT ia %s ifp1 %s osrczone %d != srczone %d\n",
390 s_src, ifp1->if_xname, osrczone, srczone);
391 goto next;
392 }
393 /* avoid unusable addresses */
394 if ((ia->ia6_flags &
395 (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
396 SASEL_LOG("NEXT ia %s ifp1 %s ia6_flags 0x%x\n",
397 s_src, ifp1->if_xname, ia->ia6_flags);
398 goto next;
399 }
400 if (!ip6_use_deprecated && IFA6_IS_DEPRECATED(ia, secs)) {
401 SASEL_LOG("NEXT ia %s ifp1 %s IFA6_IS_DEPRECATED\n",
402 s_src, ifp1->if_xname);
403 goto next;
404 }
405 if (!nd6_optimistic_dad &&
406 (ia->ia6_flags & IN6_IFF_OPTIMISTIC) != 0) {
407 SASEL_LOG("NEXT ia %s ifp1 %s IN6_IFF_OPTIMISTIC\n",
408 s_src, ifp1->if_xname);
409 goto next;
410 }
411 /* Rule 1: Prefer same address */
412 if (in6_are_addr_equal_scoped(&dst, &ia->ia_addr.sin6_addr, dstzone, srczone)) {
413 BREAK(IP6S_SRCRULE_1); /* there should be no better candidate */
414 }
415 if (ia_best == NULL) {
416 REPLACE(IP6S_SRCRULE_0);
417 }
418
419 /* Rule 2: Prefer appropriate scope */
420 if (dst_scope < 0) {
421 dst_scope = in6_addrscope(&dst);
422 }
423 new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
424 if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
425 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0) {
426 REPLACE(IP6S_SRCRULE_2);
427 }
428 NEXTSRC(IP6S_SRCRULE_2);
429 } else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
430 if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0) {
431 NEXTSRC(IP6S_SRCRULE_2);
432 }
433 REPLACE(IP6S_SRCRULE_2);
434 }
435
436 /*
437 * Rule 3: Avoid deprecated addresses. Note that the case of
438 * !ip6_use_deprecated is already rejected above.
439 */
440 if (!IFA6_IS_DEPRECATED(ia_best, secs) &&
441 IFA6_IS_DEPRECATED(ia, secs)) {
442 NEXTSRC(IP6S_SRCRULE_3);
443 }
444 if (IFA6_IS_DEPRECATED(ia_best, secs) &&
445 !IFA6_IS_DEPRECATED(ia, secs)) {
446 REPLACE(IP6S_SRCRULE_3);
447 }
448
449 /*
450 * RFC 4429 says that optimistic addresses are equivalent to
451 * deprecated addresses, so avoid them here.
452 */
453 if ((ia_best->ia6_flags & IN6_IFF_OPTIMISTIC) == 0 &&
454 (ia->ia6_flags & IN6_IFF_OPTIMISTIC) != 0) {
455 NEXTSRC(IP6S_SRCRULE_3);
456 }
457 if ((ia_best->ia6_flags & IN6_IFF_OPTIMISTIC) != 0 &&
458 (ia->ia6_flags & IN6_IFF_OPTIMISTIC) == 0) {
459 REPLACE(IP6S_SRCRULE_3);
460 }
461
462 /* Rule 4: Prefer home addresses */
463 /*
464 * XXX: This is a TODO. We should probably merge the MIP6
465 * case above.
466 */
467
468 /* Rule 5: Prefer outgoing interface */
469 /*
470 * XXX By default we are strong end with source address
471 * selection. That means all address selection candidate
472 * addresses will be the ones hosted on the outgoing interface
473 * making the following check redundant.
474 */
475 if (ip6_select_src_strong_end == 0) {
476 if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp) {
477 NEXTSRC(IP6S_SRCRULE_5);
478 }
479 if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp) {
480 REPLACE(IP6S_SRCRULE_5);
481 }
482 }
483
484 /*
485 * Rule 5.5: Prefer addresses in a prefix advertised by the next-hop.
486 * If SA or SA's prefix is assigned by the selected next-hop that will
487 * be used to send to D and SB or SB's prefix is assigned by a different
488 * next-hop, then prefer SA. Similarly, if SB or SB's prefix is
489 * assigned by the next-hop that will be used to send to D and SA or
490 * SA's prefix is assigned by a different next-hop, then prefer SB.
491 */
492 if (dr != NULL && ia_best->ia6_ndpr != ia->ia6_ndpr) {
493 boolean_t ia_best_has_prefix = FALSE;
494 boolean_t ia_has_prefix = FALSE;
495 struct nd_prefix ia_best_prefix = {};
496 struct nd_prefix ia_prefix = {};
497 struct nd_prefix *p_ia_best_prefix = NULL;
498 struct nd_prefix *p_ia_prefix = NULL;
499
500 if (ia_best->ia6_ndpr) {
501 ia_best_prefix = *ia_best->ia6_ndpr;
502 }
503
504 if (ia->ia6_ndpr) {
505 ia_prefix = *ia->ia6_ndpr;
506 }
507
508 IFA_UNLOCK(&ia->ia_ifa);
509 lck_rw_done(&in6_ifaddr_rwlock);
510
511 p_ia_best_prefix = nd6_prefix_lookup(&ia_best_prefix, ND6_PREFIX_EXPIRY_UNSPEC);
512 p_ia_prefix = nd6_prefix_lookup(&ia_prefix, ND6_PREFIX_EXPIRY_UNSPEC);
513
514 lck_mtx_lock(nd6_mutex);
515 if (p_ia_best_prefix != NULL) {
516 NDPR_LOCK(p_ia_best_prefix);
517 ia_best_has_prefix = (pfxrtr_lookup(p_ia_best_prefix, dr) != NULL);
518 NDPR_UNLOCK(p_ia_best_prefix);
519 NDPR_REMREF(p_ia_best_prefix);
520 }
521 if (p_ia_prefix != NULL) {
522 NDPR_LOCK(p_ia_prefix);
523 ia_has_prefix = (pfxrtr_lookup(p_ia_prefix, dr) != NULL);
524 NDPR_UNLOCK(p_ia_prefix);
525 NDPR_REMREF(p_ia_prefix);
526 }
527 lck_mtx_unlock(nd6_mutex);
528
529 lck_rw_lock_shared(&in6_ifaddr_rwlock);
530 if (genid != os_atomic_load(&in6_ifaddrlist_genid, acquire)) {
531 SASEL_LOG("Address list seems to have changed. Restarting source "
532 "address selection.\n");
533 genid = in6_ifaddrlist_genid;
534 /*
535 * We are starting from scratch. Free up the reference
536 * on ia_best and also reset it to NULL.
537 */
538 ifa_remref(&ia_best->ia_ifa);
539 ia_best = NULL;
540 goto addrloop;
541 }
542 IFA_LOCK(&ia->ia_ifa);
543
544 if (ia_best_has_prefix && !ia_has_prefix) {
545 NEXTSRC(IP6S_SRCRULE_5_5);
546 }
547
548 if (!ia_best_has_prefix && ia_has_prefix) {
549 REPLACE(IP6S_SRCRULE_5_5);
550 }
551 }
552
553 /*
554 * Rule 6: Prefer matching label
555 * Note that best_policy should be non-NULL here.
556 */
557 if (dst_policy == NULL) {
558 dst_policy = in6_addrsel_lookup_policy(dstsock);
559 }
560 if (dst_policy->label != ADDR_LABEL_NOTAPP) {
561 new_policy = in6_addrsel_lookup_policy(&ia->ia_addr);
562 if (dst_policy->label == best_policy->label &&
563 dst_policy->label != new_policy->label) {
564 NEXTSRC(IP6S_SRCRULE_6);
565 }
566 if (dst_policy->label != best_policy->label &&
567 dst_policy->label == new_policy->label) {
568 REPLACE(IP6S_SRCRULE_6);
569 }
570 }
571
572 /*
573 * Rule 7: Prefer temporary addresses.
574 * We allow users to reverse the logic by configuring
575 * a sysctl variable, so that transparency conscious users can
576 * always prefer stable addresses.
577 */
578 if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
579 (ia->ia6_flags & IN6_IFF_TEMPORARY)) {
580 if (hint_mask & IPV6_SRCSEL_HINT_PREFER_TMPADDR) {
581 REPLACE(IP6S_SRCRULE_7);
582 } else {
583 NEXTSRC(IP6S_SRCRULE_7);
584 }
585 }
586 if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
587 !(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
588 if (hint_mask & IPV6_SRCSEL_HINT_PREFER_TMPADDR) {
589 NEXTSRC(IP6S_SRCRULE_7);
590 } else {
591 REPLACE(IP6S_SRCRULE_7);
592 }
593 }
594
595 /*
596 * Rule 7x: prefer addresses on alive interfaces.
597 * This is a KAME specific rule.
598 */
599 if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
600 !(ia->ia_ifp->if_flags & IFF_UP)) {
601 NEXTSRC(IP6S_SRCRULE_7x);
602 }
603 if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
604 (ia->ia_ifp->if_flags & IFF_UP)) {
605 REPLACE(IP6S_SRCRULE_7x);
606 }
607
608 /*
609 * Rule 8: Use longest matching prefix.
610 */
611 new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
612 if (best_matchlen < new_matchlen) {
613 REPLACE(IP6S_SRCRULE_8);
614 }
615 if (new_matchlen < best_matchlen) {
616 NEXTSRC(IP6S_SRCRULE_8);
617 }
618
619 /*
620 * Last resort: just keep the current candidate.
621 * Or, do we need more rules?
622 */
623 if (ifp1 != ifp && (ifp1->if_eflags & IFEF_EXPENSIVE) &&
624 ip6_select_src_expensive_secondary_if == 0) {
625 SASEL_LOG("NEXT ia %s ifp1 %s IFEF_EXPENSIVE\n",
626 s_src, ifp1->if_xname);
627 ip6stat.ip6s_sources_skip_expensive_secondary_if++;
628 goto next;
629 }
630 SASEL_LOG("NEXT ia %s ifp1 %s last resort\n",
631 s_src, ifp1->if_xname);
632 IFA_UNLOCK(&ia->ia_ifa);
633 continue;
634
635 replace:
636 /*
637 * Ignore addresses on secondary interfaces that are marked
638 * expensive
639 */
640 if (ifp1 != ifp && (ifp1->if_eflags & IFEF_EXPENSIVE) &&
641 ip6_select_src_expensive_secondary_if == 0) {
642 SASEL_LOG("NEXT ia %s ifp1 %s IFEF_EXPENSIVE\n",
643 s_src, ifp1->if_xname);
644 ip6stat.ip6s_sources_skip_expensive_secondary_if++;
645 goto next;
646 }
647 bestrule = srcrule;
648 best_scope = (new_scope >= 0 ? new_scope :
649 in6_addrscope(&ia->ia_addr.sin6_addr));
650 best_policy = (new_policy ? new_policy :
651 in6_addrsel_lookup_policy(&ia->ia_addr));
652 best_matchlen = (new_matchlen >= 0 ? new_matchlen :
653 in6_matchlen(&ia->ia_addr.sin6_addr, &dst));
654 SASEL_LOG("NEXT ia %s ifp1 %s best_scope %d new_scope %d dst_scope %d\n",
655 s_src, ifp1->if_xname, best_scope, new_scope, dst_scope);
656 ifa_addref(&ia->ia_ifa); /* for ia_best */
657 IFA_UNLOCK(&ia->ia_ifa);
658 if (ia_best != NULL) {
659 ifa_remref(&ia_best->ia_ifa);
660 }
661 ia_best = ia;
662 continue;
663
664 next:
665 IFA_UNLOCK(&ia->ia_ifa);
666 continue;
667
668 out:
669 ifa_addref(&ia->ia_ifa); /* for ia_best */
670 IFA_UNLOCK(&ia->ia_ifa);
671 if (ia_best != NULL) {
672 ifa_remref(&ia_best->ia_ifa);
673 }
674 ia_best = ia;
675 break;
676 }
677
678 lck_rw_done(&in6_ifaddr_rwlock);
679
680 if ((ia = ia_best) == NULL) {
681 if (*errorp == 0) {
682 *errorp = EADDRNOTAVAIL;
683 }
684 src_storage = NULL;
685 goto done;
686 }
687
688 if (sifp != NULL) {
689 *sifp = ia->ia_ifa.ifa_ifp;
690 ifnet_reference(*sifp);
691 }
692
693 IFA_LOCK_SPIN(&ia->ia_ifa);
694 if (bestrule < IP6S_SRCRULE_COUNT) {
695 ip6stat.ip6s_sources_rule[bestrule]++;
696 }
697 *src_storage = satosin6(&ia->ia_addr)->sin6_addr;
698 IFA_UNLOCK(&ia->ia_ifa);
699
700 if (ifapp != NULL) {
701 *ifapp = &ia->ia_ifa;
702 } else {
703 ifa_remref(&ia->ia_ifa);
704 }
705
706 done:
707 if (srcsel_debug) {
708 (void) inet_ntop(AF_INET6, &dst, s_dst, sizeof(s_src));
709
710 tmp = (src_storage != NULL) ? src_storage : &in6addr_any;
711 (void) inet_ntop(AF_INET6, tmp, s_src, sizeof(s_src));
712
713 os_log(OS_LOG_DEFAULT, "%s out src %s dst %s dst_scope %d best_scope %d",
714 __func__, s_src, s_dst, dst_scope, best_scope);
715 }
716
717 if (dr != NULL) {
718 NDDR_REMREF(dr);
719 }
720
721 return src_storage;
722 }
723
724 /*
725 * Regardless of error, it will return an ifp with a reference held if the
726 * caller provides a non-NULL ifpp. The caller is responsible for checking
727 * if the returned ifp is valid and release its reference at all times.
728 */
729 struct in6_addr *
in6_selectsrc(struct sockaddr_in6 * dstsock,struct ip6_pktopts * opts,struct inpcb * inp,struct route_in6 * ro,struct ifnet ** ifpp,struct in6_addr * src_storage,unsigned int ifscope,int * errorp)730 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
731 struct inpcb *inp, struct route_in6 *ro,
732 struct ifnet **ifpp, struct in6_addr *src_storage, unsigned int ifscope,
733 int *errorp)
734 {
735 struct ifnet *ifp = NULL;
736 struct in6_pktinfo *pi = NULL;
737 struct ip6_moptions *mopts;
738 struct ip6_out_args ip6oa;
739 boolean_t inp_debug = FALSE;
740 uint32_t hint_mask = 0;
741 int prefer_tempaddr = 0;
742 struct ifnet *sifp = NULL;
743
744 bzero(&ip6oa, sizeof(ip6oa));
745 ip6oa.ip6oa_boundif = ifscope;
746 ip6oa.ip6oa_flags = IP6OAF_SELECT_SRCIF;
747 ip6oa.ip6oa_sotc = SO_TC_UNSPEC;
748 ip6oa.ip6oa_netsvctype = _NET_SERVICE_TYPE_UNSPEC;
749
750 *errorp = 0;
751 if (ifpp != NULL) {
752 *ifpp = NULL;
753 }
754
755 if (inp != NULL) {
756 inp_debug = SASEL_DO_DBG(inp);
757 mopts = inp->in6p_moptions;
758 if (INP_NO_CELLULAR(inp)) {
759 ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
760 }
761 if (INP_NO_EXPENSIVE(inp)) {
762 ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
763 }
764 if (INP_NO_CONSTRAINED(inp)) {
765 ip6oa.ip6oa_flags |= IP6OAF_NO_CONSTRAINED;
766 }
767 if (INP_AWDL_UNRESTRICTED(inp)) {
768 ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
769 }
770 if (INP_INTCOPROC_ALLOWED(inp)) {
771 ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED;
772 }
773 if (INP_MANAGEMENT_ALLOWED(inp)) {
774 ip6oa.ip6oa_flags |= IP6OAF_MANAGEMENT_ALLOWED;
775 }
776 } else {
777 mopts = NULL;
778 /* Allow the kernel to retransmit packets. */
779 ip6oa.ip6oa_flags |= IP6OAF_INTCOPROC_ALLOWED |
780 IP6OAF_AWDL_UNRESTRICTED | IP6OAF_MANAGEMENT_ALLOWED;
781 }
782
783 if (ip6oa.ip6oa_boundif != IFSCOPE_NONE) {
784 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
785 }
786
787 /*
788 * If the source address is explicitly specified by the caller,
789 * check if the requested source address is indeed a unicast address
790 * assigned to the node, and can be used as the packet's source
791 * address. If everything is okay, use the address as source.
792 */
793 if (opts && (pi = opts->ip6po_pktinfo) &&
794 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
795 struct sockaddr_in6 srcsock;
796 struct in6_ifaddr *ia6;
797
798 /* get the outgoing interface */
799 if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ip6oa,
800 &ifp)) != 0) {
801 src_storage = NULL;
802 goto done;
803 }
804
805 /*
806 * determine the appropriate zone id of the source based on
807 * the zone of the destination and the outgoing interface.
808 * If the specified address is ambiguous wrt the scope zone,
809 * the interface must be specified; otherwise, ifa_ifwithaddr()
810 * will fail matching the address.
811 */
812 SOCKADDR_ZERO(&srcsock, sizeof(srcsock));
813 srcsock.sin6_family = AF_INET6;
814 srcsock.sin6_len = sizeof(srcsock);
815 srcsock.sin6_addr = pi->ipi6_addr;
816 if (ifp != NULL) {
817 *errorp = in6_setscope(&srcsock.sin6_addr, ifp, IN6_NULL_IF_EMBEDDED_SCOPE(&srcsock.sin6_scope_id));
818 if (*errorp != 0) {
819 src_storage = NULL;
820 goto done;
821 }
822 }
823 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(SA(&srcsock));
824 if (ia6 == NULL) {
825 *errorp = EADDRNOTAVAIL;
826 src_storage = NULL;
827 goto done;
828 }
829 IFA_LOCK_SPIN(&ia6->ia_ifa);
830 if ((ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_CLAT46)) ||
831 (inp && inp_restricted_send(inp, ia6->ia_ifa.ifa_ifp))) {
832 IFA_UNLOCK(&ia6->ia_ifa);
833 ifa_remref(&ia6->ia_ifa);
834 *errorp = EHOSTUNREACH;
835 src_storage = NULL;
836 goto done;
837 }
838
839 *src_storage = satosin6(&ia6->ia_addr)->sin6_addr;
840 IFA_UNLOCK(&ia6->ia_ifa);
841 ifa_remref(&ia6->ia_ifa);
842 goto done;
843 }
844
845 /*
846 * Otherwise, if the socket has already bound the source, just use it.
847 */
848 if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
849 src_storage = &inp->in6p_laddr;
850 goto done;
851 }
852
853 /*
854 * If the address is not specified, choose the best one based on
855 * the outgoing interface and the destination address.
856 */
857 /* get the outgoing interface */
858 if ((*errorp = in6_selectif(dstsock, opts, mopts, ro, &ip6oa,
859 &ifp)) != 0) {
860 src_storage = NULL;
861 goto done;
862 }
863
864 VERIFY(ifp != NULL);
865
866 if (opts == NULL ||
867 opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
868 prefer_tempaddr = ip6_prefer_tempaddr;
869 } else if (opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_NOTPREFER) {
870 prefer_tempaddr = 0;
871 } else {
872 prefer_tempaddr = 1;
873 }
874
875 if (prefer_tempaddr) {
876 hint_mask |= IPV6_SRCSEL_HINT_PREFER_TMPADDR;
877 }
878
879 if (in6_selectsrc_core(dstsock, hint_mask, ifp, inp_debug, src_storage,
880 &sifp, errorp, NULL, ro) == NULL) {
881 src_storage = NULL;
882 goto done;
883 }
884
885 VERIFY(sifp != NULL);
886
887 if (inp && inp_restricted_send(inp, sifp)) {
888 src_storage = NULL;
889 *errorp = EHOSTUNREACH;
890 ifnet_release(sifp);
891 goto done;
892 } else {
893 ifnet_release(sifp);
894 }
895
896 done:
897 if (ifpp != NULL) {
898 /* if ifp is non-NULL, refcnt held in in6_selectif() */
899 *ifpp = ifp;
900 } else if (ifp != NULL) {
901 ifnet_release(ifp);
902 }
903 return src_storage;
904 }
905
906 /*
907 * Given a source IPv6 address (and route, if available), determine the best
908 * interface to send the packet from. Checking for (and updating) the
909 * ROF_SRCIF_SELECTED flag in the pcb-supplied route placeholder is done
910 * without any locks, based on the assumption that in the event this is
911 * called from ip6_output(), the output operation is single-threaded per-pcb,
912 * i.e. for any given pcb there can only be one thread performing output at
913 * the IPv6 layer.
914 *
915 * This routine is analogous to in_selectsrcif() for IPv4. Regardless of
916 * error, it will return an ifp with a reference held if the caller provides
917 * a non-NULL retifp. The caller is responsible for checking if the
918 * returned ifp is valid and release its reference at all times.
919 *
920 * clone - meaningful only for bsdi and freebsd
921 */
922 static int
selectroute(struct sockaddr_in6 * srcsock,struct sockaddr_in6 * dstsock,struct ip6_pktopts * opts,struct ip6_moptions * mopts,struct in6_ifaddr ** retsrcia,struct route_in6 * ro,struct ifnet ** retifp,struct rtentry ** retrt,int clone,int norouteok,struct ip6_out_args * ip6oa)923 selectroute(struct sockaddr_in6 *srcsock, struct sockaddr_in6 *dstsock,
924 struct ip6_pktopts *opts, struct ip6_moptions *mopts,
925 struct in6_ifaddr **retsrcia, struct route_in6 *ro,
926 struct ifnet **retifp, struct rtentry **retrt, int clone,
927 int norouteok, struct ip6_out_args *ip6oa)
928 {
929 int error = 0;
930 struct ifnet *ifp = NULL, *ifp0 = NULL;
931 struct route_in6 *route = NULL;
932 struct sockaddr_in6 *sin6_next;
933 struct in6_pktinfo *pi = NULL;
934 struct in6_addr *dst = &dstsock->sin6_addr;
935 struct ifaddr *ifa = NULL;
936 char s_src[MAX_IPv6_STR_LEN], s_dst[MAX_IPv6_STR_LEN];
937 boolean_t select_srcif, proxied_ifa = FALSE, local_dst = FALSE;
938 unsigned int ifscope = ((ip6oa != NULL) ?
939 ip6oa->ip6oa_boundif : IFSCOPE_NONE);
940 boolean_t is_direct = FALSE;
941
942 if (retifp != NULL) {
943 *retifp = NULL;
944 }
945
946 if (retrt != NULL) {
947 *retrt = NULL;
948 }
949
950 if (ip6_select_srcif_debug) {
951 struct in6_addr src;
952 src = (srcsock != NULL) ? srcsock->sin6_addr : in6addr_any;
953 (void) inet_ntop(AF_INET6, &src, s_src, sizeof(s_src));
954 (void) inet_ntop(AF_INET6, dst, s_dst, sizeof(s_dst));
955 }
956
957 /*
958 * If the destination address is UNSPECIFIED addr, bail out.
959 */
960 if (IN6_IS_ADDR_UNSPECIFIED(dst)) {
961 error = EHOSTUNREACH;
962 goto done;
963 }
964
965 /*
966 * Perform source interface selection if Scoped Routing
967 * is enabled and a source address that isn't unspecified.
968 */
969 select_srcif = (srcsock != NULL &&
970 !IN6_IS_ADDR_UNSPECIFIED(&srcsock->sin6_addr));
971
972 /*
973 * For scoped routing, if interface scope is 0 or src/dst addr is linklocal
974 * or dst addr is multicast, source interface selection should be performed even
975 * if the destination is directly reachable.
976 */
977 if (ifscope != IFSCOPE_NONE &&
978 !(srcsock != NULL && IN6_IS_ADDR_LINKLOCAL(&srcsock->sin6_addr)) &&
979 !IN6_IS_ADDR_MULTICAST(dst) && !IN6_IS_ADDR_LINKLOCAL(dst)) {
980 struct rtentry *temp_rt = NULL;
981
982 lck_mtx_lock(rnh_lock);
983 temp_rt = rt_lookup(TRUE, SA(dstsock),
984 NULL, rt_tables[AF_INET6], ifscope);
985 lck_mtx_unlock(rnh_lock);
986
987 /*
988 * If the destination is directly reachable, relax
989 * the behavior around select_srcif, i.e. don't force
990 * the packet to go out from the interface that is hosting
991 * the source address.
992 * It happens when we share v6 with NAT66 and want
993 * the external interface's v6 address to be reachable
994 * to the clients we are sharing v6 connectivity with
995 * using NAT.
996 */
997 if (temp_rt != NULL) {
998 if ((temp_rt->rt_flags & RTF_GATEWAY) == 0) {
999 select_srcif = FALSE;
1000 is_direct = TRUE;
1001 }
1002 rtfree(temp_rt);
1003 }
1004 }
1005
1006 if (ip6_select_srcif_debug) {
1007 os_log(OS_LOG_DEFAULT, "%s src %s dst %s ifscope %d "
1008 "is_direct %d select_srcif %d",
1009 __func__, s_src, s_dst, ifscope, is_direct, select_srcif);
1010 }
1011
1012 /* If the caller specified the outgoing interface explicitly, use it */
1013 if (opts != NULL && (pi = opts->ip6po_pktinfo) != NULL &&
1014 pi->ipi6_ifindex != 0) {
1015 /*
1016 * If IPV6_PKTINFO takes precedence over IPV6_BOUND_IF.
1017 */
1018 ifscope = pi->ipi6_ifindex;
1019 ifnet_head_lock_shared();
1020 /* ifp may be NULL if detached or out of range */
1021 ifp = ifp0 =
1022 ((ifscope <= if_index) ? ifindex2ifnet[ifscope] : NULL);
1023 ifnet_head_done();
1024 if (norouteok || retrt == NULL || IN6_IS_ADDR_MC_LINKLOCAL(dst)) {
1025 /*
1026 * We do not have to check or get the route for
1027 * multicast. If the caller didn't ask/care for
1028 * the route and we have no interface to use,
1029 * it's an error.
1030 */
1031 if (ifp == NULL) {
1032 error = EHOSTUNREACH;
1033 }
1034 goto done;
1035 } else {
1036 goto getsrcif;
1037 }
1038 }
1039
1040 /*
1041 * If the destination address is a multicast address and the outgoing
1042 * interface for the address is specified by the caller, use it.
1043 */
1044 if (IN6_IS_ADDR_MULTICAST(dst) && mopts != NULL) {
1045 IM6O_LOCK(mopts);
1046 ifp = ifp0 = mopts->im6o_multicast_ifp;
1047 if (ifp != NULL && IN6_IS_ADDR_MC_LINKLOCAL(dst)) {
1048 IM6O_UNLOCK(mopts);
1049 goto done; /* we don't need a route for link-local multicast */
1050 }
1051 IM6O_UNLOCK(mopts);
1052 }
1053
1054 getsrcif:
1055 /*
1056 * If the outgoing interface was not set via IPV6_BOUND_IF or
1057 * IPV6_PKTINFO, use the scope ID in the destination address.
1058 */
1059 if (ifscope == IFSCOPE_NONE) {
1060 ifscope = dstsock->sin6_scope_id;
1061 }
1062
1063 /*
1064 * Perform source interface selection; the source IPv6 address
1065 * must belong to one of the addresses of the interface used
1066 * by the route. For performance reasons, do this only if
1067 * there is no route, or if the routing table has changed,
1068 * or if we haven't done source interface selection on this
1069 * route (for this PCB instance) before.
1070 */
1071 if (!select_srcif) {
1072 goto getroute;
1073 } else if (!ROUTE_UNUSABLE(ro) && ro->ro_srcia != NULL &&
1074 (ro->ro_flags & ROF_SRCIF_SELECTED)) {
1075 if (ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) {
1076 local_dst = TRUE;
1077 }
1078 ifa = ro->ro_srcia;
1079 ifa_addref(ifa); /* for caller */
1080 goto getroute;
1081 }
1082
1083 /*
1084 * Given the source IPv6 address, find a suitable source interface
1085 * to use for transmission; if a scope ID has been specified,
1086 * optimize the search by looking at the addresses only for that
1087 * interface. This is still suboptimal, however, as we need to
1088 * traverse the per-interface list.
1089 */
1090 if (ifscope != IFSCOPE_NONE || (ro != NULL && ro->ro_rt != NULL)) {
1091 unsigned int scope = ifscope;
1092 struct ifnet *rt_ifp;
1093
1094 rt_ifp = (ro->ro_rt != NULL) ? ro->ro_rt->rt_ifp : NULL;
1095
1096 /*
1097 * If no scope is specified and the route is stale (pointing
1098 * to a defunct interface) use the current primary interface;
1099 * this happens when switching between interfaces configured
1100 * with the same IPv6 address. Otherwise pick up the scope
1101 * information from the route; the ULP may have looked up a
1102 * correct route and we just need to verify it here and mark
1103 * it with the ROF_SRCIF_SELECTED flag below.
1104 */
1105 if (scope == IFSCOPE_NONE) {
1106 scope = rt_ifp->if_index;
1107 if (scope != get_primary_ifscope(AF_INET6) &&
1108 ROUTE_UNUSABLE(ro)) {
1109 scope = get_primary_ifscope(AF_INET6);
1110 }
1111 }
1112
1113 ifa = (struct ifaddr *)
1114 ifa_foraddr6_scoped(&srcsock->sin6_addr, scope);
1115
1116 /*
1117 * If we are forwarding and proxying prefix(es), see if the
1118 * source address is one of ours and is a proxied address;
1119 * if so, use it.
1120 */
1121 if (ifa == NULL && ip6_forwarding && nd6_prproxy) {
1122 ifa = (struct ifaddr *)
1123 ifa_foraddr6(&srcsock->sin6_addr);
1124 if (ifa != NULL && !(proxied_ifa =
1125 nd6_prproxy_ifaddr((struct in6_ifaddr *)ifa))) {
1126 ifa_remref(ifa);
1127 ifa = NULL;
1128 }
1129 }
1130
1131 if (ip6_select_srcif_debug && ifa != NULL) {
1132 if (ro->ro_rt != NULL) {
1133 os_log(OS_LOG_DEFAULT, "%s %s->%s ifscope %d->%d ifa_if %s "
1134 "ro_if %s",
1135 __func__,
1136 s_src, s_dst, ifscope,
1137 scope, if_name(ifa->ifa_ifp),
1138 if_name(rt_ifp));
1139 } else {
1140 os_log(OS_LOG_DEFAULT, "%s %s->%s ifscope %d->%d ifa_if %s",
1141 __func__,
1142 s_src, s_dst, ifscope, scope,
1143 if_name(ifa->ifa_ifp));
1144 }
1145 }
1146 }
1147
1148 /*
1149 * Slow path; search for an interface having the corresponding source
1150 * IPv6 address if the scope was not specified by the caller, and:
1151 *
1152 * 1) There currently isn't any route, or,
1153 * 2) The interface used by the route does not own that source
1154 * IPv6 address; in this case, the route will get blown away
1155 * and we'll do a more specific scoped search using the newly
1156 * found interface.
1157 */
1158 if (ifa == NULL && ifscope == IFSCOPE_NONE) {
1159 struct ifaddr *ifadst;
1160
1161 /* Check if the destination address is one of ours */
1162 ifadst = (struct ifaddr *)ifa_foraddr6(&dstsock->sin6_addr);
1163 if (ifadst != NULL) {
1164 local_dst = TRUE;
1165 ifa_remref(ifadst);
1166 }
1167
1168 ifa = (struct ifaddr *)ifa_foraddr6(&srcsock->sin6_addr);
1169
1170 if (ip6_select_srcif_debug && ifa != NULL) {
1171 os_log(OS_LOG_DEFAULT, "%s %s->%s ifscope %d ifa_if %s",
1172 __func__,
1173 s_src, s_dst, ifscope, if_name(ifa->ifa_ifp));
1174 } else if (ip6_select_srcif_debug) {
1175 os_log(OS_LOG_DEFAULT, "%s %s->%s ifscope %d ifa_if NULL",
1176 __func__,
1177 s_src, s_dst, ifscope);
1178 }
1179 }
1180
1181 getroute:
1182 if (ifa != NULL && !proxied_ifa && !local_dst) {
1183 ifscope = ifa->ifa_ifp->if_index;
1184 }
1185
1186 /*
1187 * If the next hop address for the packet is specified by the caller,
1188 * use it as the gateway.
1189 */
1190 if (opts != NULL && opts->ip6po_nexthop != NULL) {
1191 struct route_in6 *ron;
1192
1193 sin6_next = satosin6(opts->ip6po_nexthop);
1194
1195 /* at this moment, we only support AF_INET6 next hops */
1196 if (sin6_next->sin6_family != AF_INET6) {
1197 error = EAFNOSUPPORT; /* or should we proceed? */
1198 goto done;
1199 }
1200
1201 /*
1202 * If the next hop is an IPv6 address, then the node identified
1203 * by that address must be a neighbor of the sending host.
1204 */
1205 ron = &opts->ip6po_nextroute;
1206 if (ron->ro_rt != NULL) {
1207 RT_LOCK(ron->ro_rt);
1208 }
1209 if (ROUTE_UNUSABLE(ron) || (ron->ro_rt != NULL &&
1210 (!(ron->ro_rt->rt_flags & RTF_LLINFO) ||
1211 (select_srcif && (ifa == NULL ||
1212 (ifa->ifa_ifp != ron->ro_rt->rt_ifp && !proxied_ifa))))) ||
1213 !in6_are_addr_equal_scoped(&satosin6(&ron->ro_dst)->sin6_addr,
1214 &sin6_next->sin6_addr, ron->ro_rt->rt_ifp->if_index, sin6_next->sin6_scope_id)) {
1215 if (ron->ro_rt != NULL) {
1216 RT_UNLOCK(ron->ro_rt);
1217 }
1218
1219 ROUTE_RELEASE(ron);
1220 *satosin6(&ron->ro_dst) = *sin6_next;
1221 }
1222 if (ron->ro_rt == NULL) {
1223 rtalloc_scoped((struct route *)ron, ifscope);
1224 if (ron->ro_rt != NULL) {
1225 RT_LOCK(ron->ro_rt);
1226 }
1227 if (ROUTE_UNUSABLE(ron) ||
1228 !(ron->ro_rt->rt_flags & RTF_LLINFO) ||
1229 !in6_are_addr_equal_scoped(&satosin6(rt_key(ron->ro_rt))->
1230 sin6_addr, &sin6_next->sin6_addr, ron->ro_rt->rt_ifp->if_index, sin6_next->sin6_scope_id)) {
1231 if (ron->ro_rt != NULL) {
1232 RT_UNLOCK(ron->ro_rt);
1233 }
1234
1235 ROUTE_RELEASE(ron);
1236 error = EHOSTUNREACH;
1237 goto done;
1238 }
1239 }
1240 route = ron;
1241 ifp = ifp0 = ron->ro_rt->rt_ifp;
1242
1243 /*
1244 * When cloning is required, try to allocate a route to the
1245 * destination so that the caller can store path MTU
1246 * information.
1247 */
1248 if (!clone) {
1249 if (select_srcif) {
1250 /* Keep the route locked */
1251 goto validateroute;
1252 }
1253 RT_UNLOCK(ron->ro_rt);
1254 goto done;
1255 }
1256 RT_UNLOCK(ron->ro_rt);
1257 }
1258
1259 /*
1260 * Use a cached route if it exists and is valid, else try to allocate
1261 * a new one. Note that we should check the address family of the
1262 * cached destination, in case of sharing the cache with IPv4.
1263 */
1264 if (ro == NULL) {
1265 goto done;
1266 }
1267 if (ro->ro_rt != NULL) {
1268 RT_LOCK_SPIN(ro->ro_rt);
1269 }
1270 if (ROUTE_UNUSABLE(ro) || (ro->ro_rt != NULL &&
1271 (satosin6(&ro->ro_dst)->sin6_family != AF_INET6 ||
1272 !in6_are_addr_equal_scoped(&satosin6(&ro->ro_dst)->sin6_addr, dst, ro->ro_rt->rt_ifp->if_index, dstsock->sin6_scope_id) ||
1273 (select_srcif && (ifa == NULL ||
1274 (ifa->ifa_ifp != ro->ro_rt->rt_ifp && !proxied_ifa)))))) {
1275 if (ro->ro_rt != NULL) {
1276 RT_UNLOCK(ro->ro_rt);
1277 }
1278
1279 ROUTE_RELEASE(ro);
1280 }
1281 if (ro->ro_rt == NULL) {
1282 struct sockaddr_in6 *sa6;
1283
1284 /* No route yet, so try to acquire one */
1285 SOCKADDR_ZERO(&ro->ro_dst, sizeof(struct sockaddr_in6));
1286 sa6 = SIN6(&ro->ro_dst);
1287 sa6->sin6_family = AF_INET6;
1288 sa6->sin6_len = sizeof(struct sockaddr_in6);
1289 sa6->sin6_addr = *dst;
1290 if (IN6_IS_ADDR_MC_LINKLOCAL(dst)) {
1291 ro->ro_rt = rtalloc1_scoped(
1292 SA(&((struct route *)ro)->ro_dst), 0, 0, ifscope);
1293 } else {
1294 rtalloc_scoped((struct route *)ro, ifscope);
1295 }
1296 if (ro->ro_rt != NULL) {
1297 RT_LOCK_SPIN(ro->ro_rt);
1298 }
1299 }
1300
1301 /*
1302 * Do not care about the result if we have the nexthop
1303 * explicitly specified (in case we're asked to clone.)
1304 */
1305 if (opts != NULL && opts->ip6po_nexthop != NULL) {
1306 if (ro->ro_rt != NULL) {
1307 RT_UNLOCK(ro->ro_rt);
1308 }
1309 goto done;
1310 }
1311
1312 if (ro->ro_rt != NULL) {
1313 RT_LOCK_ASSERT_HELD(ro->ro_rt);
1314 ifp = ifp0 = ro->ro_rt->rt_ifp;
1315 } else {
1316 error = EHOSTUNREACH;
1317 }
1318 route = ro;
1319
1320 validateroute:
1321 if (select_srcif) {
1322 boolean_t has_route = (route != NULL && route->ro_rt != NULL);
1323 boolean_t srcif_selected = FALSE;
1324
1325 if (has_route) {
1326 RT_LOCK_ASSERT_HELD(route->ro_rt);
1327 }
1328 /*
1329 * If there is a non-loopback route with the wrong interface,
1330 * or if there is no interface configured with such an address,
1331 * blow it away. Except for local/loopback, we look for one
1332 * with a matching interface scope/index.
1333 */
1334 if (has_route && (ifa == NULL ||
1335 (ifa->ifa_ifp != ifp && ifp != lo_ifp) ||
1336 !(route->ro_rt->rt_flags & RTF_UP))) {
1337 /*
1338 * If the destination address belongs to a proxied
1339 * prefix, relax the requirement and allow the packet
1340 * to come out of the proxy interface with the source
1341 * address of the real interface.
1342 */
1343 if (ifa != NULL && proxied_ifa &&
1344 (route->ro_rt->rt_flags & (RTF_UP | RTF_PROXY)) ==
1345 (RTF_UP | RTF_PROXY)) {
1346 srcif_selected = TRUE;
1347 } else {
1348 if (ip6_select_srcif_debug) {
1349 if (ifa != NULL) {
1350 os_log(OS_LOG_DEFAULT,
1351 "%s->%s ifscope %d "
1352 "ro_if %s != ifa_if %s "
1353 "(cached route cleared)",
1354 s_src, s_dst,
1355 ifscope, if_name(ifp),
1356 if_name(ifa->ifa_ifp));
1357 } else {
1358 os_log(OS_LOG_DEFAULT,
1359 "%s->%s ifscope %d "
1360 "ro_if %s (no ifa_if "
1361 "found)", s_src, s_dst,
1362 ifscope, if_name(ifp));
1363 }
1364 }
1365 RT_UNLOCK(route->ro_rt);
1366 ROUTE_RELEASE(route);
1367 error = EHOSTUNREACH;
1368 /* Undo the settings done above */
1369 route = NULL;
1370 ifp = NULL; /* ditch ifp; keep ifp0 */
1371 has_route = FALSE;
1372 }
1373 } else if (has_route) {
1374 srcif_selected = TRUE;
1375 }
1376
1377 if (srcif_selected) {
1378 VERIFY(has_route);
1379 if (ifa != route->ro_srcia ||
1380 !(route->ro_flags & ROF_SRCIF_SELECTED)) {
1381 RT_CONVERT_LOCK(route->ro_rt);
1382 if (ifa != NULL) {
1383 ifa_addref(ifa); /* for route_in6 */
1384 }
1385 if (route->ro_srcia != NULL) {
1386 ifa_remref(route->ro_srcia);
1387 }
1388 route->ro_srcia = ifa;
1389 route->ro_flags |= ROF_SRCIF_SELECTED;
1390 RT_GENID_SYNC(route->ro_rt);
1391 }
1392 RT_UNLOCK(route->ro_rt);
1393 }
1394 } else {
1395 if (ro->ro_rt != NULL) {
1396 RT_UNLOCK(ro->ro_rt);
1397 }
1398 if (ifp != NULL && opts != NULL &&
1399 opts->ip6po_pktinfo != NULL &&
1400 opts->ip6po_pktinfo->ipi6_ifindex != 0) {
1401 /*
1402 * Check if the outgoing interface conflicts with the
1403 * interface specified by ipi6_ifindex (if specified).
1404 * Note that loopback interface is always okay.
1405 * (this may happen when we are sending a packet to
1406 * one of our own addresses.)
1407 */
1408 if (!(ifp->if_flags & IFF_LOOPBACK) && ifp->if_index !=
1409 opts->ip6po_pktinfo->ipi6_ifindex) {
1410 error = EHOSTUNREACH;
1411 goto done;
1412 }
1413 }
1414 }
1415
1416 done:
1417 /*
1418 * Check for interface restrictions.
1419 */
1420 #define CHECK_RESTRICTIONS(_ip6oa, _ifp) \
1421 ((((_ip6oa)->ip6oa_flags & IP6OAF_NO_CELLULAR) && \
1422 IFNET_IS_CELLULAR(_ifp)) || \
1423 (((_ip6oa)->ip6oa_flags & IP6OAF_NO_EXPENSIVE) && \
1424 IFNET_IS_EXPENSIVE(_ifp)) || \
1425 (((_ip6oa)->ip6oa_flags & IP6OAF_NO_CONSTRAINED) && \
1426 IFNET_IS_CONSTRAINED(_ifp)) || \
1427 (!((_ip6oa)->ip6oa_flags & IP6OAF_INTCOPROC_ALLOWED) && \
1428 IFNET_IS_INTCOPROC(_ifp)) || \
1429 (!((_ip6oa)->ip6oa_flags & IP6OAF_AWDL_UNRESTRICTED) && \
1430 IFNET_IS_AWDL_RESTRICTED(_ifp)) && \
1431 (!((_ip6oa)->ip6oa_flags & IP6OAF_MANAGEMENT_ALLOWED) && \
1432 IFNET_IS_MANAGEMENT(_ifp)))
1433
1434 if (error == 0 && ip6oa != NULL &&
1435 ((ifp && CHECK_RESTRICTIONS(ip6oa, ifp)) ||
1436 (route && route->ro_rt &&
1437 CHECK_RESTRICTIONS(ip6oa, route->ro_rt->rt_ifp)))) {
1438 if (route != NULL && route->ro_rt != NULL) {
1439 ROUTE_RELEASE(route);
1440 route = NULL;
1441 }
1442 ifp = NULL; /* ditch ifp; keep ifp0 */
1443 error = EHOSTUNREACH;
1444 ip6oa->ip6oa_flags |= IP6OAF_R_IFDENIED;
1445 }
1446 #undef CHECK_RESTRICTIONS
1447
1448 /*
1449 * If the interface is disabled for IPv6, then ENETDOWN error.
1450 */
1451 if (error == 0 &&
1452 ifp != NULL && (ifp->if_eflags & IFEF_IPV6_DISABLED)) {
1453 error = ENETDOWN;
1454 }
1455
1456 if (ifp == NULL && (route == NULL || route->ro_rt == NULL)) {
1457 /*
1458 * This can happen if the caller did not pass a cached route
1459 * nor any other hints. We treat this case an error.
1460 */
1461 error = EHOSTUNREACH;
1462 }
1463 if (error == EHOSTUNREACH || error == ENETDOWN) {
1464 ip6stat.ip6s_noroute++;
1465 }
1466
1467 /*
1468 * We'll return ifp regardless of error, so pick it up from ifp0
1469 * in case it was nullified above. Caller is responsible for
1470 * releasing the ifp if it is non-NULL.
1471 */
1472 ifp = ifp0;
1473 if (retifp != NULL) {
1474 if (ifp != NULL) {
1475 ifnet_reference(ifp); /* for caller */
1476 }
1477 *retifp = ifp;
1478 }
1479
1480 if (retsrcia != NULL) {
1481 if (ifa != NULL) {
1482 ifa_addref(ifa); /* for caller */
1483 }
1484 *retsrcia = (struct in6_ifaddr *)ifa;
1485 }
1486
1487 if (error == 0) {
1488 if (retrt != NULL && route != NULL) {
1489 *retrt = route->ro_rt; /* ro_rt may be NULL */
1490 }
1491 }
1492 if (ip6_select_srcif_debug) {
1493 os_log(OS_LOG_DEFAULT,
1494 "%s %s->%s ifscope %d ifa_if %s ro_if %s (error=%d)",
1495 __func__,
1496 s_src, s_dst, ifscope,
1497 (ifa != NULL) ? if_name(ifa->ifa_ifp) : "NONE",
1498 (ifp != NULL) ? if_name(ifp) : "NONE", error);
1499 }
1500
1501 if (ifa != NULL) {
1502 ifa_remref(ifa);
1503 }
1504
1505 return error;
1506 }
1507
1508 /*
1509 * Regardless of error, it will return an ifp with a reference held if the
1510 * caller provides a non-NULL retifp. The caller is responsible for checking
1511 * if the returned ifp is valid and release its reference at all times.
1512 */
1513 int
in6_selectif(struct sockaddr_in6 * dstsock,struct ip6_pktopts * opts,struct ip6_moptions * mopts,struct route_in6 * ro,struct ip6_out_args * ip6oa,struct ifnet ** retifp)1514 in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
1515 struct ip6_moptions *mopts, struct route_in6 *ro,
1516 struct ip6_out_args *ip6oa, struct ifnet **retifp)
1517 {
1518 int err = 0;
1519 struct route_in6 sro;
1520 struct rtentry *rt = NULL;
1521
1522 if (ro == NULL) {
1523 bzero(&sro, sizeof(sro));
1524 ro = &sro;
1525 }
1526
1527 if ((err = selectroute(NULL, dstsock, opts, mopts, NULL, ro, retifp,
1528 &rt, 0, 1, ip6oa)) != 0) {
1529 goto done;
1530 }
1531
1532 /*
1533 * do not use a rejected or black hole route.
1534 * XXX: this check should be done in the L2 output routine.
1535 * However, if we skipped this check here, we'd see the following
1536 * scenario:
1537 * - install a rejected route for a scoped address prefix
1538 * (like fe80::/10)
1539 * - send a packet to a destination that matches the scoped prefix,
1540 * with ambiguity about the scope zone.
1541 * - pick the outgoing interface from the route, and disambiguate the
1542 * scope zone with the interface.
1543 * - ip6_output() would try to get another route with the "new"
1544 * destination, which may be valid.
1545 * - we'd see no error on output.
1546 * Although this may not be very harmful, it should still be confusing.
1547 * We thus reject the case here.
1548 */
1549 if (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
1550 err = ((rt->rt_flags & RTF_HOST) ? EHOSTUNREACH : ENETUNREACH);
1551 goto done;
1552 }
1553
1554 /*
1555 * Adjust the "outgoing" interface. If we're going to loop the packet
1556 * back to ourselves, the ifp would be the loopback interface.
1557 * However, we'd rather know the interface associated to the
1558 * destination address (which should probably be one of our own
1559 * addresses.)
1560 */
1561 if (rt != NULL && rt->rt_ifa != NULL && rt->rt_ifa->ifa_ifp != NULL &&
1562 retifp != NULL) {
1563 ifnet_reference(rt->rt_ifa->ifa_ifp);
1564 if (*retifp != NULL) {
1565 ifnet_release(*retifp);
1566 }
1567 *retifp = rt->rt_ifa->ifa_ifp;
1568 }
1569
1570 done:
1571 if (ro == &sro) {
1572 VERIFY(rt == NULL || rt == ro->ro_rt);
1573 ROUTE_RELEASE(ro);
1574 }
1575
1576 /*
1577 * retifp might point to a valid ifp with a reference held;
1578 * caller is responsible for releasing it if non-NULL.
1579 */
1580 return err;
1581 }
1582
1583 /*
1584 * Regardless of error, it will return an ifp with a reference held if the
1585 * caller provides a non-NULL retifp. The caller is responsible for checking
1586 * if the returned ifp is valid and release its reference at all times.
1587 *
1588 * clone - meaningful only for bsdi and freebsd
1589 */
1590 int
in6_selectroute(struct sockaddr_in6 * srcsock,struct sockaddr_in6 * dstsock,struct ip6_pktopts * opts,struct ip6_moptions * mopts,struct in6_ifaddr ** retsrcia,struct route_in6 * ro,struct ifnet ** retifp,struct rtentry ** retrt,int clone,struct ip6_out_args * ip6oa)1591 in6_selectroute(struct sockaddr_in6 *srcsock, struct sockaddr_in6 *dstsock,
1592 struct ip6_pktopts *opts, struct ip6_moptions *mopts,
1593 struct in6_ifaddr **retsrcia, struct route_in6 *ro, struct ifnet **retifp,
1594 struct rtentry **retrt, int clone, struct ip6_out_args *ip6oa)
1595 {
1596 return selectroute(srcsock, dstsock, opts, mopts, retsrcia, ro, retifp,
1597 retrt, clone, 0, ip6oa);
1598 }
1599
1600 /*
1601 * Default hop limit selection. The precedence is as follows:
1602 * 1. Hoplimit value specified via socket option.
1603 * 2. (If the outgoing interface is detected) the current
1604 * hop limit of the interface specified by router advertisement.
1605 * 3. The system default hoplimit.
1606 */
1607 uint8_t
in6_selecthlim(struct in6pcb * in6p,struct ifnet * ifp)1608 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
1609 {
1610 if (in6p && in6p->in6p_hops >= 0) {
1611 return (uint8_t)in6p->in6p_hops;
1612 } else if (NULL != ifp) {
1613 uint8_t chlim;
1614 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
1615 if (ndi && ndi->initialized) {
1616 /* access chlim without lock, for performance */
1617 chlim = ndi->chlim;
1618 } else {
1619 chlim = (uint8_t)ip6_defhlim;
1620 }
1621 return chlim;
1622 }
1623
1624 return (uint8_t)ip6_defhlim;
1625 }
1626
1627 /*
1628 * XXX: this is borrowed from in6_pcbbind(). If possible, we should
1629 * share this function by all *bsd*...
1630 */
1631 int
in6_pcbsetport(struct in6_addr * laddr,struct inpcb * inp,struct proc * p,int locked)1632 in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct proc *p,
1633 int locked)
1634 {
1635 struct socket *so = inp->inp_socket;
1636 uint16_t lport = 0, first, last, *lastport, rand_port;
1637 int count, error = 0, wild = 0;
1638 boolean_t counting_down;
1639 bool found, randomport;
1640 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
1641 kauth_cred_t cred;
1642 #if SKYWALK
1643 bool laddr_unspecified = IN6_IS_ADDR_UNSPECIFIED(laddr);
1644 #else
1645 #pragma unused(laddr)
1646 #endif
1647 if (!locked) { /* Make sure we don't run into a deadlock: 4052373 */
1648 if (!lck_rw_try_lock_exclusive(&pcbinfo->ipi_lock)) {
1649 socket_unlock(inp->inp_socket, 0);
1650 lck_rw_lock_exclusive(&pcbinfo->ipi_lock);
1651 socket_lock(inp->inp_socket, 0);
1652 }
1653
1654 /*
1655 * Check if a local port was assigned to the inp while
1656 * this thread was waiting for the pcbinfo lock
1657 */
1658 if (inp->inp_lport != 0) {
1659 VERIFY(inp->inp_flags2 & INP2_INHASHLIST);
1660 lck_rw_done(&pcbinfo->ipi_lock);
1661
1662 /*
1663 * It is not an error if another thread allocated
1664 * a port
1665 */
1666 return 0;
1667 }
1668 }
1669
1670 /* XXX: this is redundant when called from in6_pcbbind */
1671 if ((so->so_options & (SO_REUSEADDR | SO_REUSEPORT)) == 0) {
1672 wild = INPLOOKUP_WILDCARD;
1673 }
1674
1675 randomport = (so->so_flags & SOF_BINDRANDOMPORT) > 0 ||
1676 (so->so_type == SOCK_STREAM ? tcp_use_randomport :
1677 udp_use_randomport) > 0;
1678
1679 if (inp->inp_flags & INP_HIGHPORT) {
1680 first = (uint16_t)ipport_hifirstauto; /* sysctl */
1681 last = (uint16_t)ipport_hilastauto;
1682 lastport = &pcbinfo->ipi_lasthi;
1683 } else if (inp->inp_flags & INP_LOWPORT) {
1684 cred = kauth_cred_proc_ref(p);
1685 error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0);
1686 kauth_cred_unref(&cred);
1687 if (error != 0) {
1688 if (!locked) {
1689 lck_rw_done(&pcbinfo->ipi_lock);
1690 }
1691 return error;
1692 }
1693 first = (uint16_t)ipport_lowfirstauto; /* 1023 */
1694 last = (uint16_t)ipport_lowlastauto; /* 600 */
1695 lastport = &pcbinfo->ipi_lastlow;
1696 } else {
1697 first = (uint16_t)ipport_firstauto; /* sysctl */
1698 last = (uint16_t)ipport_lastauto;
1699 lastport = &pcbinfo->ipi_lastport;
1700 }
1701
1702 if (first == last) {
1703 randomport = false;
1704 }
1705 /*
1706 * Simple check to ensure all ports are not used up causing
1707 * a deadlock here.
1708 */
1709 found = false;
1710 if (first > last) {
1711 /* counting down */
1712 if (randomport) {
1713 read_frandom(&rand_port, sizeof(rand_port));
1714 *lastport = first - (rand_port % (first - last));
1715 }
1716 count = first - last;
1717 counting_down = TRUE;
1718 } else {
1719 /* counting up */
1720 if (randomport) {
1721 read_frandom(&rand_port, sizeof(rand_port));
1722 *lastport = first + (rand_port % (first - last));
1723 }
1724 count = last - first;
1725 counting_down = FALSE;
1726 }
1727 do {
1728 if (count-- < 0) { /* completely used? */
1729 /*
1730 * Undo any address bind that may have
1731 * occurred above.
1732 */
1733 inp->in6p_laddr = in6addr_any;
1734 inp->in6p_last_outifp = NULL;
1735 inp->inp_lifscope = IFSCOPE_NONE;
1736 #if SKYWALK
1737 if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) {
1738 netns_set_ifnet(&inp->inp_netns_token,
1739 NULL);
1740 }
1741 #endif /* SKYWALK */
1742 if (!locked) {
1743 lck_rw_done(&pcbinfo->ipi_lock);
1744 }
1745 return EAGAIN;
1746 }
1747 if (counting_down) {
1748 --*lastport;
1749 if (*lastport > first || *lastport < last) {
1750 *lastport = first;
1751 }
1752 } else {
1753 ++*lastport;
1754 if (*lastport < first || *lastport > last) {
1755 *lastport = first;
1756 }
1757 }
1758 lport = htons(*lastport);
1759
1760 /*
1761 * Skip if this is a restricted port as we do not want to
1762 * restricted ports as ephemeral
1763 */
1764 if (IS_RESTRICTED_IN_PORT(lport)) {
1765 continue;
1766 }
1767
1768 found = (in6_pcblookup_local(pcbinfo, &inp->in6p_laddr,
1769 lport, inp->inp_lifscope, wild) == NULL);
1770 #if SKYWALK
1771 if (found &&
1772 (SOCK_PROTO(so) == IPPROTO_TCP ||
1773 SOCK_PROTO(so) == IPPROTO_UDP) &&
1774 !(inp->inp_flags2 & INP2_EXTERNAL_PORT)) {
1775 if (laddr_unspecified &&
1776 (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
1777 struct in_addr ip_zero = { .s_addr = 0 };
1778
1779 netns_release(&inp->inp_wildcard_netns_token);
1780 if (netns_reserve_in(
1781 &inp->inp_wildcard_netns_token,
1782 ip_zero,
1783 (uint8_t)SOCK_PROTO(so), lport,
1784 NETNS_BSD, NULL) != 0) {
1785 /* port in use in IPv4 namespace */
1786 found = false;
1787 }
1788 }
1789 if (found &&
1790 netns_reserve_in6(&inp->inp_netns_token,
1791 inp->in6p_laddr, (uint8_t)SOCK_PROTO(so), lport,
1792 NETNS_BSD, NULL) != 0) {
1793 netns_release(&inp->inp_wildcard_netns_token);
1794 found = false;
1795 }
1796 }
1797 #endif /* SKYWALK */
1798 } while (!found);
1799
1800 inp->inp_lport = lport;
1801 inp->inp_flags |= INP_ANONPORT;
1802
1803 if (in_pcbinshash(inp, 1) != 0) {
1804 inp->in6p_laddr = in6addr_any;
1805 inp->in6p_last_outifp = NULL;
1806 inp->inp_lifscope = IFSCOPE_NONE;
1807 #if SKYWALK
1808 netns_release(&inp->inp_netns_token);
1809 #endif /* SKYWALK */
1810 inp->inp_lport = 0;
1811 inp->inp_flags &= ~INP_ANONPORT;
1812 if (!locked) {
1813 lck_rw_done(&pcbinfo->ipi_lock);
1814 }
1815 return EAGAIN;
1816 }
1817
1818 if (!locked) {
1819 lck_rw_done(&pcbinfo->ipi_lock);
1820 }
1821 return 0;
1822 }
1823
1824 /*
1825 * The followings are implementation of the policy table using a
1826 * simple tail queue.
1827 * XXX such details should be hidden.
1828 * XXX implementation using binary tree should be more efficient.
1829 */
1830 struct addrsel_policyent {
1831 TAILQ_ENTRY(addrsel_policyent) ape_entry;
1832 struct in6_addrpolicy ape_policy;
1833 };
1834
1835 TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
1836
1837 struct addrsel_policyhead addrsel_policytab;
1838
1839 static void
init_policy_queue(void)1840 init_policy_queue(void)
1841 {
1842 TAILQ_INIT(&addrsel_policytab);
1843 }
1844
1845 void
addrsel_policy_init(void)1846 addrsel_policy_init(void)
1847 {
1848 /*
1849 * Default address selection policy based on RFC 6724.
1850 */
1851 static const struct in6_addrpolicy defaddrsel[] = {
1852 /* Loopback -- prefix=::1/128, precedence=50, label=0 */
1853 {
1854 .addr = {
1855 .sin6_family = AF_INET6,
1856 .sin6_addr = IN6ADDR_LOOPBACK_INIT,
1857 .sin6_len = sizeof(struct sockaddr_in6)
1858 },
1859 .addrmask = {
1860 .sin6_family = AF_INET6,
1861 .sin6_addr = IN6MASK128,
1862 .sin6_len = sizeof(struct sockaddr_in6)
1863 },
1864 .preced = 50,
1865 .label = 0
1866 },
1867
1868 /* Unspecified -- prefix=::/0, precedence=40, label=1 */
1869 {
1870 .addr = {
1871 .sin6_family = AF_INET6,
1872 .sin6_addr = IN6ADDR_ANY_INIT,
1873 .sin6_len = sizeof(struct sockaddr_in6)
1874 },
1875 .addrmask = {
1876 .sin6_family = AF_INET6,
1877 .sin6_addr = IN6MASK0,
1878 .sin6_len = sizeof(struct sockaddr_in6)
1879 },
1880 .preced = 40,
1881 .label = 1
1882 },
1883
1884 /* IPv4 Mapped -- prefix=::ffff:0:0/96, precedence=35, label=4 */
1885 {
1886 .addr = {
1887 .sin6_family = AF_INET6,
1888 .sin6_addr = IN6ADDR_V4MAPPED_INIT,
1889 .sin6_len = sizeof(struct sockaddr_in6)
1890 },
1891 .addrmask = {
1892 .sin6_family = AF_INET6,
1893 .sin6_addr = IN6MASK96,
1894 .sin6_len = sizeof(struct sockaddr_in6)
1895 },
1896 .preced = 35,
1897 .label = 4
1898 },
1899
1900 /* 6to4 -- prefix=2002::/16, precedence=30, label=2 */
1901 {
1902 .addr = {
1903 .sin6_family = AF_INET6,
1904 .sin6_addr = {{{ 0x20, 0x02 }}},
1905 .sin6_len = sizeof(struct sockaddr_in6)
1906 },
1907 .addrmask = {
1908 .sin6_family = AF_INET6,
1909 .sin6_addr = IN6MASK16,
1910 .sin6_len = sizeof(struct sockaddr_in6)
1911 },
1912 .preced = 30,
1913 .label = 2
1914 },
1915
1916 /* Teredo -- prefix=2001::/32, precedence=5, label=5 */
1917 {
1918 .addr = {
1919 .sin6_family = AF_INET6,
1920 .sin6_addr = {{{ 0x20, 0x01 }}},
1921 .sin6_len = sizeof(struct sockaddr_in6)
1922 },
1923 .addrmask = {
1924 .sin6_family = AF_INET6,
1925 .sin6_addr = IN6MASK32,
1926 .sin6_len = sizeof(struct sockaddr_in6)
1927 },
1928 .preced = 5,
1929 .label = 5
1930 },
1931
1932 /* Unique Local (ULA) -- prefix=fc00::/7, precedence=3, label=13 */
1933 {
1934 .addr = {
1935 .sin6_family = AF_INET6,
1936 .sin6_addr = {{{ 0xfc }}},
1937 .sin6_len = sizeof(struct sockaddr_in6)
1938 },
1939 .addrmask = {
1940 .sin6_family = AF_INET6,
1941 .sin6_addr = IN6MASK7,
1942 .sin6_len = sizeof(struct sockaddr_in6)
1943 },
1944 .preced = 3,
1945 .label = 13
1946 },
1947
1948 /* IPv4 Compatible -- prefix=::/96, precedence=1, label=3 */
1949 {
1950 .addr = {
1951 .sin6_family = AF_INET6,
1952 .sin6_addr = IN6ADDR_ANY_INIT,
1953 .sin6_len = sizeof(struct sockaddr_in6)
1954 },
1955 .addrmask = {
1956 .sin6_family = AF_INET6,
1957 .sin6_addr = IN6MASK96,
1958 .sin6_len = sizeof(struct sockaddr_in6)
1959 },
1960 .preced = 1,
1961 .label = 3
1962 },
1963
1964 /* Site-local (deprecated) -- prefix=fec0::/10, precedence=1, label=11 */
1965 {
1966 .addr = {
1967 .sin6_family = AF_INET6,
1968 .sin6_addr = {{{ 0xfe, 0xc0 }}},
1969 .sin6_len = sizeof(struct sockaddr_in6)
1970 },
1971 .addrmask = {
1972 .sin6_family = AF_INET6,
1973 .sin6_addr = IN6MASK16,
1974 .sin6_len = sizeof(struct sockaddr_in6)
1975 },
1976 .preced = 1,
1977 .label = 11
1978 },
1979
1980 /* 6bone (deprecated) -- prefix=3ffe::/16, precedence=1, label=12 */
1981 {
1982 .addr = {
1983 .sin6_family = AF_INET6,
1984 .sin6_addr = {{{ 0x3f, 0xfe }}},
1985 .sin6_len = sizeof(struct sockaddr_in6)
1986 },
1987 .addrmask = {
1988 .sin6_family = AF_INET6,
1989 .sin6_addr = IN6MASK16,
1990 .sin6_len = sizeof(struct sockaddr_in6)
1991 },
1992 .preced = 1,
1993 .label = 12
1994 },
1995 };
1996 int i;
1997
1998 init_policy_queue();
1999
2000 /* initialize the "last resort" policy */
2001 bzero(&defaultaddrpolicy, sizeof(defaultaddrpolicy));
2002 defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
2003
2004 for (i = 0; i < sizeof(defaddrsel) / sizeof(defaddrsel[0]); i++) {
2005 add_addrsel_policyent(&defaddrsel[i]);
2006 }
2007 }
2008
2009 struct in6_addrpolicy *
in6_addrsel_lookup_policy(struct sockaddr_in6 * key)2010 in6_addrsel_lookup_policy(struct sockaddr_in6 *key)
2011 {
2012 struct in6_addrpolicy *match = NULL;
2013
2014 match = match_addrsel_policy(key);
2015
2016 if (match == NULL) {
2017 match = &defaultaddrpolicy;
2018 } else {
2019 match->use++;
2020 }
2021
2022 return match;
2023 }
2024
2025 static struct in6_addrpolicy *
match_addrsel_policy(struct sockaddr_in6 * key)2026 match_addrsel_policy(struct sockaddr_in6 *key)
2027 {
2028 struct addrsel_policyent *pent;
2029 struct in6_addrpolicy *bestpol = NULL, *pol;
2030 int matchlen, bestmatchlen = -1;
2031 u_char *mp, *ep, *k, *p, m;
2032
2033 TAILQ_FOREACH(pent, &addrsel_policytab, ape_entry) {
2034 matchlen = 0;
2035
2036 pol = &pent->ape_policy;
2037 mp = (u_char *)&pol->addrmask.sin6_addr;
2038 ep = mp + 16; /* XXX: scope field? */
2039 k = (u_char *)&key->sin6_addr;
2040 p = (u_char *)&pol->addr.sin6_addr;
2041 for (; mp < ep && *mp; mp++, k++, p++) {
2042 m = *mp;
2043 if ((*k & m) != *p) {
2044 goto next; /* not match */
2045 }
2046 if (m == 0xff) { /* short cut for a typical case */
2047 matchlen += 8;
2048 } else {
2049 while (m >= 0x80) {
2050 matchlen++;
2051 m = (u_char)(m << 1);
2052 }
2053 }
2054 }
2055
2056 /* matched. check if this is better than the current best. */
2057 if (bestpol == NULL ||
2058 matchlen > bestmatchlen) {
2059 bestpol = pol;
2060 bestmatchlen = matchlen;
2061 }
2062
2063 next:
2064 continue;
2065 }
2066
2067 return bestpol;
2068 }
2069
2070 static int
add_addrsel_policyent(const struct in6_addrpolicy * newpolicy)2071 add_addrsel_policyent(const struct in6_addrpolicy *newpolicy)
2072 {
2073 struct addrsel_policyent *new, *pol;
2074
2075 new = kalloc_type(struct addrsel_policyent, Z_WAITOK | Z_ZERO);
2076
2077 /* duplication check */
2078 TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
2079 if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
2080 &pol->ape_policy.addr.sin6_addr) &&
2081 IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
2082 &pol->ape_policy.addrmask.sin6_addr)) {
2083 kfree_type(struct addrsel_policyent, new);
2084 return EEXIST; /* or override it? */
2085 }
2086 }
2087
2088 /* XXX: should validate entry */
2089 new->ape_policy = *newpolicy;
2090
2091 TAILQ_INSERT_TAIL(&addrsel_policytab, new, ape_entry);
2092
2093 return 0;
2094 }
2095
2096 int
walk_addrsel_policy(int (* callback)(const struct in6_addrpolicy *,void *),void * w)2097 walk_addrsel_policy(int (*callback)(const struct in6_addrpolicy *, void *),
2098 void *w)
2099 {
2100 struct addrsel_policyent *pol;
2101 int error = 0;
2102
2103 TAILQ_FOREACH(pol, &addrsel_policytab, ape_entry) {
2104 if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
2105 return error;
2106 }
2107 }
2108 return error;
2109 }
2110 /*
2111 * Subroutines to manage the address selection policy table via sysctl.
2112 */
2113 struct walkarg {
2114 struct sysctl_req *w_req;
2115 };
2116
2117
2118 static int
dump_addrsel_policyent(const struct in6_addrpolicy * pol,void * arg)2119 dump_addrsel_policyent(const struct in6_addrpolicy *pol, void *arg)
2120 {
2121 int error = 0;
2122 struct walkarg *w = arg;
2123
2124 error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
2125
2126 return error;
2127 }
2128
2129 static int
2130 in6_src_sysctl SYSCTL_HANDLER_ARGS
2131 {
2132 #pragma unused(oidp, arg1, arg2)
2133 struct walkarg w;
2134
2135 if (req->newptr) {
2136 return EPERM;
2137 }
2138 bzero(&w, sizeof(w));
2139 w.w_req = req;
2140
2141 return walk_addrsel_policy(dump_addrsel_policyent, &w);
2142 }
2143
2144
2145 SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
2146 CTLFLAG_RD | CTLFLAG_LOCKED, in6_src_sysctl, "");
2147 int
in6_src_ioctl(u_long cmd,caddr_t data)2148 in6_src_ioctl(u_long cmd, caddr_t data)
2149 {
2150 int i;
2151 struct in6_addrpolicy ent0;
2152
2153 if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY) {
2154 return EOPNOTSUPP; /* check for safety */
2155 }
2156 bcopy(data, &ent0, sizeof(ent0));
2157
2158 if (ent0.label == ADDR_LABEL_NOTAPP) {
2159 return EINVAL;
2160 }
2161 /* check if the prefix mask is consecutive. */
2162 if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0) {
2163 return EINVAL;
2164 }
2165 /* clear trailing garbages (if any) of the prefix address. */
2166 for (i = 0; i < 4; i++) {
2167 ent0.addr.sin6_addr.s6_addr32[i] &=
2168 ent0.addrmask.sin6_addr.s6_addr32[i];
2169 }
2170 ent0.use = 0;
2171
2172 switch (cmd) {
2173 case SIOCAADDRCTL_POLICY:
2174 return ENOTSUP;
2175 case SIOCDADDRCTL_POLICY:
2176 return ENOTSUP;
2177 }
2178
2179 return 0; /* XXX: compromise compilers */
2180 }
2181
2182 /*
2183 * generate kernel-internal form (scopeid embedded into s6_addr16[1]).
2184 * If the address scope of is link-local, embed the interface index in the
2185 * address. The routine determines our precedence
2186 * between advanced API scope/interface specification and basic API
2187 * specification.
2188 *
2189 * this function should be nuked in the future, when we get rid of
2190 * embedded scopeid thing.
2191 *
2192 * XXX actually, it is over-specification to return ifp against sin6_scope_id.
2193 * there can be multiple interfaces that belong to a particular scope zone
2194 * (in specification, we have 1:N mapping between a scope zone and interfaces).
2195 * we may want to change the function to return something other than ifp.
2196 */
2197 int
in6_embedscope(struct in6_addr * in6,const struct sockaddr_in6 * sin6,struct in6pcb * in6p,struct ifnet ** ifpp,struct ip6_pktopts * opt,uint32_t * ret_ifscope)2198 in6_embedscope(struct in6_addr *in6, const struct sockaddr_in6 *sin6,
2199 struct in6pcb *in6p, struct ifnet **ifpp, struct ip6_pktopts *opt, uint32_t *ret_ifscope)
2200 {
2201 struct ifnet *ifp = NULL;
2202 u_int32_t scopeid;
2203 struct ip6_pktopts *optp = NULL;
2204
2205 *in6 = sin6->sin6_addr;
2206 scopeid = sin6->sin6_scope_id;
2207 if (ifpp != NULL) {
2208 *ifpp = NULL;
2209 }
2210
2211 /*
2212 * don't try to read sin6->sin6_addr beyond here, since the caller may
2213 * ask us to overwrite existing sockaddr_in6
2214 */
2215
2216 #ifdef ENABLE_DEFAULT_SCOPE
2217 if (scopeid == 0) {
2218 scopeid = scope6_addr2default(in6);
2219 }
2220 #endif
2221
2222 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
2223 struct in6_pktinfo *pi;
2224 struct ifnet *im6o_multicast_ifp = NULL;
2225
2226 if (in6p != NULL && IN6_IS_ADDR_MULTICAST(in6) &&
2227 in6p->in6p_moptions != NULL) {
2228 IM6O_LOCK(in6p->in6p_moptions);
2229 im6o_multicast_ifp =
2230 in6p->in6p_moptions->im6o_multicast_ifp;
2231 IM6O_UNLOCK(in6p->in6p_moptions);
2232 }
2233
2234 if (opt != NULL) {
2235 optp = opt;
2236 } else if (in6p != NULL) {
2237 optp = in6p->in6p_outputopts;
2238 }
2239 /*
2240 * KAME assumption: link id == interface id
2241 */
2242 if (in6p != NULL && optp != NULL &&
2243 (pi = optp->ip6po_pktinfo) != NULL &&
2244 pi->ipi6_ifindex != 0) {
2245 /* ifp is needed here if only we're returning it */
2246 if (ifpp != NULL) {
2247 ifnet_head_lock_shared();
2248 ifp = ifindex2ifnet[pi->ipi6_ifindex];
2249 ifnet_head_done();
2250 }
2251
2252 if (in6_embedded_scope) {
2253 in6->s6_addr16[1] = htons((uint16_t)pi->ipi6_ifindex);
2254 }
2255 if (ret_ifscope != NULL) {
2256 *ret_ifscope = pi->ipi6_ifindex;
2257 }
2258 } else if (in6p != NULL && IN6_IS_ADDR_MULTICAST(in6) &&
2259 in6p->in6p_moptions != NULL && im6o_multicast_ifp != NULL) {
2260 ifp = im6o_multicast_ifp;
2261 if (in6_embedded_scope) {
2262 in6->s6_addr16[1] = htons(ifp->if_index);
2263 }
2264 if (ret_ifscope != NULL) {
2265 *ret_ifscope = ifp->if_index;
2266 }
2267 } else if (scopeid != 0) {
2268 /*
2269 * Since scopeid is unsigned, we only have to check it
2270 * against if_index (ifnet_head_lock not needed since
2271 * if_index is an ever-increasing integer.)
2272 */
2273 if (!IF_INDEX_IN_RANGE(scopeid)) {
2274 return ENXIO; /* XXX EINVAL? */
2275 }
2276 /* ifp is needed here only if we're returning it */
2277 if (ifpp != NULL) {
2278 ifnet_head_lock_shared();
2279 ifp = ifindex2ifnet[scopeid];
2280 ifnet_head_done();
2281 }
2282 if (in6_embedded_scope) {
2283 /* XXX assignment to 16bit from 32bit variable */
2284 in6->s6_addr16[1] = htons(scopeid & 0xffff);
2285 }
2286 if (ret_ifscope != NULL) {
2287 *ret_ifscope = scopeid;
2288 }
2289 }
2290
2291 if (ifpp != NULL) {
2292 if (ifp != NULL) {
2293 ifnet_reference(ifp); /* for caller */
2294 }
2295 *ifpp = ifp;
2296 }
2297 }
2298
2299 return 0;
2300 }
2301
2302 /*
2303 * generate standard sockaddr_in6 from embedded form.
2304 * touches sin6_addr and sin6_scope_id only.
2305 *
2306 * this function should be nuked in the future, when we get rid of
2307 * embedded scopeid thing.
2308 */
2309 int
in6_recoverscope(struct sockaddr_in6 * sin6,const struct in6_addr * in6,struct ifnet * ifp)2310 in6_recoverscope(
2311 struct sockaddr_in6 *sin6,
2312 const struct in6_addr *in6,
2313 struct ifnet *ifp)
2314 {
2315 u_int32_t scopeid;
2316
2317 sin6->sin6_addr = *in6;
2318
2319 if (!in6_embedded_scope) {
2320 if (ifp != NULL && IN6_IS_SCOPE_EMBED(in6)) {
2321 sin6->sin6_scope_id = ifp->if_index;
2322 }
2323 return 0;
2324 }
2325 /*
2326 * don't try to read *in6 beyond here, since the caller may
2327 * ask us to overwrite existing sockaddr_in6
2328 */
2329
2330 sin6->sin6_scope_id = 0;
2331 if (IN6_IS_SCOPE_LINKLOCAL(in6) || IN6_IS_ADDR_MC_INTFACELOCAL(in6)) {
2332 /*
2333 * KAME assumption: link id == interface id
2334 */
2335 scopeid = ntohs(sin6->sin6_addr.s6_addr16[1]);
2336 if (scopeid) {
2337 /*
2338 * sanity check
2339 *
2340 * Since scopeid is unsigned, we only have to check it
2341 * against if_index
2342 */
2343 if (!IF_INDEX_IN_RANGE(scopeid)) {
2344 return ENXIO;
2345 }
2346 if (ifp && ifp->if_index != scopeid) {
2347 return ENXIO;
2348 }
2349 sin6->sin6_addr.s6_addr16[1] = 0;
2350 sin6->sin6_scope_id = scopeid;
2351 }
2352 }
2353
2354 return 0;
2355 }
2356