1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/cdefs.h>
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/dirent.h>
44 #include <sys/jail.h>
45 #include <sys/kernel.h>
46 #include <sys/lock.h>
47 #include <sys/malloc.h>
48 #include <sys/mbuf.h>
49 #include <sys/mount.h>
50 #include <sys/mutex.h>
51 #include <sys/proc.h>
52 #include <sys/rmlock.h>
53 #include <sys/refcount.h>
54 #include <sys/signalvar.h>
55 #include <sys/socket.h>
56 #include <sys/vnode.h>
57
58 #include <netinet/in.h>
59 #include <net/radix.h>
60
61 #include <rpc/types.h>
62 #include <rpc/auth.h>
63
64 static MALLOC_DEFINE(M_NETADDR, "export_host", "Export host address structure");
65
66 #if defined(INET) || defined(INET6)
67 static struct radix_node_head *vfs_create_addrlist_af(
68 struct radix_node_head **prnh, int off);
69 #endif
70 static int vfs_free_netcred(struct radix_node *rn, void *w);
71 static void vfs_free_addrlist_af(struct radix_node_head **prnh);
72 static int vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
73 struct export_args *argp);
74 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
75
76 /*
77 * Network address lookup element
78 */
79 struct netcred {
80 struct radix_node netc_rnodes[2];
81 uint64_t netc_exflags;
82 struct ucred *netc_anon;
83 int netc_numsecflavors;
84 int netc_secflavors[MAXSECFLAVORS];
85 };
86
87 /*
88 * Network export information
89 */
90 struct netexport {
91 struct netcred ne_defexported; /* Default export */
92 struct radix_node_head *ne4;
93 struct radix_node_head *ne6;
94 };
95
96 /*
97 * Build hash lists of net addresses and hang them off the mount point.
98 * Called by vfs_export() to set up the lists of export addresses.
99 */
100 static int
vfs_hang_addrlist(struct mount * mp,struct netexport * nep,struct export_args * argp)101 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
102 struct export_args *argp)
103 {
104 struct netcred *np;
105 struct radix_node_head *rnh;
106 int i;
107 struct radix_node *rn;
108 struct sockaddr *saddr, *smask = NULL;
109 #if defined(INET6) || defined(INET)
110 int off;
111 #endif
112 int error;
113
114 KASSERT(argp->ex_numsecflavors > 0,
115 ("%s: numsecflavors <= 0", __func__));
116 KASSERT(argp->ex_numsecflavors < MAXSECFLAVORS,
117 ("%s: numsecflavors >= MAXSECFLAVORS", __func__));
118
119 /*
120 * XXX: This routine converts from a uid plus gid list
121 * to a `struct ucred' (np->netc_anon). This
122 * operation is questionable; for example, what should be done
123 * with fields like cr_uidinfo and cr_prison? Currently, this
124 * routine does not touch them (leaves them as NULL).
125 */
126 if (argp->ex_addrlen == 0) {
127 if (mp->mnt_flag & MNT_DEFEXPORTED) {
128 vfs_mount_error(mp,
129 "MNT_DEFEXPORTED already set for mount %p", mp);
130 return (EPERM);
131 }
132 np = &nep->ne_defexported;
133 np->netc_exflags = argp->ex_flags;
134 np->netc_anon = crget();
135 np->netc_anon->cr_uid = argp->ex_uid;
136 crsetgroups(np->netc_anon, argp->ex_ngroups,
137 argp->ex_groups);
138 np->netc_anon->cr_prison = &prison0;
139 prison_hold(np->netc_anon->cr_prison);
140 np->netc_numsecflavors = argp->ex_numsecflavors;
141 bcopy(argp->ex_secflavors, np->netc_secflavors,
142 sizeof(np->netc_secflavors));
143 MNT_ILOCK(mp);
144 mp->mnt_flag |= MNT_DEFEXPORTED;
145 MNT_IUNLOCK(mp);
146 return (0);
147 }
148
149 #if MSIZE <= 256
150 if (argp->ex_addrlen > MLEN) {
151 vfs_mount_error(mp, "ex_addrlen %d is greater than %d",
152 argp->ex_addrlen, MLEN);
153 return (EINVAL);
154 }
155 #endif
156
157 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
158 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
159 saddr = (struct sockaddr *) (np + 1);
160 if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
161 goto out;
162 if (saddr->sa_family == AF_UNSPEC || saddr->sa_family > AF_MAX) {
163 error = EINVAL;
164 vfs_mount_error(mp, "Invalid saddr->sa_family: %d");
165 goto out;
166 }
167 if (saddr->sa_len > argp->ex_addrlen)
168 saddr->sa_len = argp->ex_addrlen;
169 if (argp->ex_masklen) {
170 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
171 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
172 if (error)
173 goto out;
174 if (smask->sa_len > argp->ex_masklen)
175 smask->sa_len = argp->ex_masklen;
176 }
177 rnh = NULL;
178 switch (saddr->sa_family) {
179 #ifdef INET
180 case AF_INET:
181 if ((rnh = nep->ne4) == NULL) {
182 off = offsetof(struct sockaddr_in, sin_addr) << 3;
183 rnh = vfs_create_addrlist_af(&nep->ne4, off);
184 }
185 break;
186 #endif
187 #ifdef INET6
188 case AF_INET6:
189 if ((rnh = nep->ne6) == NULL) {
190 off = offsetof(struct sockaddr_in6, sin6_addr) << 3;
191 rnh = vfs_create_addrlist_af(&nep->ne6, off);
192 }
193 break;
194 #endif
195 }
196 if (rnh == NULL) {
197 error = ENOBUFS;
198 vfs_mount_error(mp, "%s %s %d",
199 "Unable to initialize radix node head ",
200 "for address family", saddr->sa_family);
201 goto out;
202 }
203 RADIX_NODE_HEAD_LOCK(rnh);
204 rn = (*rnh->rnh_addaddr)(saddr, smask, &rnh->rh, np->netc_rnodes);
205 RADIX_NODE_HEAD_UNLOCK(rnh);
206 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
207 error = EPERM;
208 vfs_mount_error(mp,
209 "netcred already exists for given addr/mask");
210 goto out;
211 }
212 np->netc_exflags = argp->ex_flags;
213 np->netc_anon = crget();
214 np->netc_anon->cr_uid = argp->ex_uid;
215 crsetgroups(np->netc_anon, argp->ex_ngroups,
216 argp->ex_groups);
217 np->netc_anon->cr_prison = &prison0;
218 prison_hold(np->netc_anon->cr_prison);
219 np->netc_numsecflavors = argp->ex_numsecflavors;
220 bcopy(argp->ex_secflavors, np->netc_secflavors,
221 sizeof(np->netc_secflavors));
222 return (0);
223 out:
224 free(np, M_NETADDR);
225 return (error);
226 }
227
228 /* Helper for vfs_free_addrlist. */
229 /* ARGSUSED */
230 static int
vfs_free_netcred(struct radix_node * rn,void * w)231 vfs_free_netcred(struct radix_node *rn, void *w)
232 {
233 struct radix_node_head *rnh = (struct radix_node_head *) w;
234 struct ucred *cred;
235
236 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, &rnh->rh);
237 cred = ((struct netcred *)rn)->netc_anon;
238 if (cred != NULL)
239 crfree(cred);
240 free(rn, M_NETADDR);
241 return (0);
242 }
243
244 #if defined(INET) || defined(INET6)
245 static struct radix_node_head *
vfs_create_addrlist_af(struct radix_node_head ** prnh,int off)246 vfs_create_addrlist_af(struct radix_node_head **prnh, int off)
247 {
248
249 if (rn_inithead((void **)prnh, off) == 0)
250 return (NULL);
251 RADIX_NODE_HEAD_LOCK_INIT(*prnh);
252 return (*prnh);
253 }
254 #endif
255
256 static void
vfs_free_addrlist_af(struct radix_node_head ** prnh)257 vfs_free_addrlist_af(struct radix_node_head **prnh)
258 {
259 struct radix_node_head *rnh;
260
261 rnh = *prnh;
262 RADIX_NODE_HEAD_LOCK(rnh);
263 (*rnh->rnh_walktree)(&rnh->rh, vfs_free_netcred, rnh);
264 RADIX_NODE_HEAD_UNLOCK(rnh);
265 RADIX_NODE_HEAD_DESTROY(rnh);
266 rn_detachhead((void **)prnh);
267 prnh = NULL;
268 }
269
270 /*
271 * Free the net address hash lists that are hanging off the mount points.
272 */
273 void
vfs_free_addrlist(struct netexport * nep)274 vfs_free_addrlist(struct netexport *nep)
275 {
276 struct ucred *cred;
277
278 if (nep->ne4 != NULL)
279 vfs_free_addrlist_af(&nep->ne4);
280 if (nep->ne6 != NULL)
281 vfs_free_addrlist_af(&nep->ne6);
282
283 cred = nep->ne_defexported.netc_anon;
284 if (cred != NULL) {
285 crfree(cred);
286 nep->ne_defexported.netc_anon = NULL;
287 }
288
289 }
290
291 /*
292 * High level function to manipulate export options on a mount point
293 * and the passed in netexport.
294 * Struct export_args *argp is the variable used to twiddle options,
295 * the structure is described in sys/mount.h
296 * The do_exjail argument should be true if *mp is in the mountlist
297 * and false if not. It is not in the mountlist for the NFSv4 rootfs
298 * fake mount point just used for exports.
299 */
300 int
vfs_export(struct mount * mp,struct export_args * argp,bool do_exjail)301 vfs_export(struct mount *mp, struct export_args *argp, bool do_exjail)
302 {
303 struct netexport *nep;
304 struct ucred *cr;
305 struct prison *pr;
306 int error;
307 bool new_nep;
308
309 if ((argp->ex_flags & (MNT_DELEXPORT | MNT_EXPORTED)) == 0)
310 return (EINVAL);
311
312 if ((argp->ex_flags & MNT_EXPORTED) != 0 &&
313 (argp->ex_numsecflavors < 0
314 || argp->ex_numsecflavors >= MAXSECFLAVORS))
315 return (EINVAL);
316
317 error = 0;
318 pr = curthread->td_ucred->cr_prison;
319 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
320 nep = mp->mnt_export;
321 if (argp->ex_flags & MNT_DELEXPORT) {
322 if (nep == NULL) {
323 error = ENOENT;
324 goto out;
325 }
326 MNT_ILOCK(mp);
327 if (mp->mnt_exjail != NULL && mp->mnt_exjail->cr_prison != pr &&
328 pr == &prison0) {
329 MNT_IUNLOCK(mp);
330 /* EXDEV will not get logged by mountd(8). */
331 error = EXDEV;
332 goto out;
333 } else if (mp->mnt_exjail != NULL &&
334 mp->mnt_exjail->cr_prison != pr) {
335 MNT_IUNLOCK(mp);
336 /* EPERM will get logged by mountd(8). */
337 error = EPERM;
338 goto out;
339 }
340 MNT_IUNLOCK(mp);
341 if (mp->mnt_flag & MNT_EXPUBLIC) {
342 vfs_setpublicfs(NULL, NULL, NULL);
343 MNT_ILOCK(mp);
344 mp->mnt_flag &= ~MNT_EXPUBLIC;
345 MNT_IUNLOCK(mp);
346 }
347 vfs_free_addrlist(nep);
348 mp->mnt_export = NULL;
349 free(nep, M_MOUNT);
350 nep = NULL;
351 MNT_ILOCK(mp);
352 cr = mp->mnt_exjail;
353 mp->mnt_exjail = NULL;
354 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
355 MNT_IUNLOCK(mp);
356 if (cr != NULL) {
357 atomic_subtract_int(&pr->pr_exportcnt, 1);
358 crfree(cr);
359 }
360 }
361 if (argp->ex_flags & MNT_EXPORTED) {
362 new_nep = false;
363 MNT_ILOCK(mp);
364 if (mp->mnt_exjail == NULL) {
365 MNT_IUNLOCK(mp);
366 if (do_exjail && nep != NULL) {
367 vfs_free_addrlist(nep);
368 memset(nep, 0, sizeof(*nep));
369 new_nep = true;
370 }
371 } else if (mp->mnt_exjail->cr_prison != pr) {
372 MNT_IUNLOCK(mp);
373 error = EPERM;
374 goto out;
375 } else
376 MNT_IUNLOCK(mp);
377 if (nep == NULL) {
378 nep = malloc(sizeof(struct netexport), M_MOUNT,
379 M_WAITOK | M_ZERO);
380 mp->mnt_export = nep;
381 new_nep = true;
382 }
383 if (argp->ex_flags & MNT_EXPUBLIC) {
384 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) {
385 if (new_nep) {
386 mp->mnt_export = NULL;
387 free(nep, M_MOUNT);
388 }
389 goto out;
390 }
391 new_nep = false;
392 MNT_ILOCK(mp);
393 if (do_exjail && mp->mnt_exjail == NULL) {
394 mp->mnt_exjail = crhold(curthread->td_ucred);
395 atomic_add_int(&pr->pr_exportcnt, 1);
396 }
397 mp->mnt_flag |= MNT_EXPUBLIC;
398 MNT_IUNLOCK(mp);
399 }
400 if (argp->ex_numsecflavors == 0) {
401 argp->ex_numsecflavors = 1;
402 argp->ex_secflavors[0] = AUTH_SYS;
403 }
404 if ((error = vfs_hang_addrlist(mp, nep, argp))) {
405 if (new_nep) {
406 mp->mnt_export = NULL;
407 free(nep, M_MOUNT);
408 }
409 goto out;
410 }
411 MNT_ILOCK(mp);
412 if (do_exjail && mp->mnt_exjail == NULL) {
413 mp->mnt_exjail = crhold(curthread->td_ucred);
414 atomic_add_int(&pr->pr_exportcnt, 1);
415 }
416 mp->mnt_flag |= MNT_EXPORTED;
417 MNT_IUNLOCK(mp);
418 }
419
420 out:
421 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
422 /*
423 * Once we have executed the vfs_export() command, we do
424 * not want to keep the "export" option around in the
425 * options list, since that will cause subsequent MNT_UPDATE
426 * calls to fail. The export information is saved in
427 * mp->mnt_export, so we can safely delete the "export" mount option
428 * here.
429 */
430 vfs_deleteopt(mp->mnt_optnew, "export");
431 vfs_deleteopt(mp->mnt_opt, "export");
432 return (error);
433 }
434
435 /*
436 * Get rid of credential references for this prison.
437 */
438 void
vfs_exjail_delete(struct prison * pr)439 vfs_exjail_delete(struct prison *pr)
440 {
441 struct mount *mp;
442 struct ucred *cr;
443 int error, i;
444
445 /*
446 * Since this function is called from prison_cleanup() after
447 * all processes in the prison have exited, the value of
448 * pr_exportcnt can no longer increase. It is possible for
449 * a dismount of a file system exported within this prison
450 * to be in progress. In this case, the file system is no
451 * longer in the mountlist and the mnt_exjail will be free'd
452 * by vfs_mount_destroy() at some time. As such, pr_exportcnt
453 * and, therefore "i", is the upper bound on the number of
454 * mnt_exjail entries to be found by this function.
455 */
456 i = atomic_load_int(&pr->pr_exportcnt);
457 KASSERT(i >= 0, ("vfs_exjail_delete: pr_exportcnt negative"));
458 if (i == 0)
459 return;
460 mtx_lock(&mountlist_mtx);
461 tryagain:
462 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
463 MNT_ILOCK(mp);
464 if (mp->mnt_exjail != NULL &&
465 mp->mnt_exjail->cr_prison == pr) {
466 MNT_IUNLOCK(mp);
467 error = vfs_busy(mp, MBF_MNTLSTLOCK | MBF_NOWAIT);
468 if (error != 0) {
469 /*
470 * If the vfs_busy() fails, we still want to
471 * get rid of mnt_exjail for two reasons:
472 * - a credential reference will result in
473 * a prison not being removed
474 * - setting mnt_exjail NULL indicates that
475 * the exports are no longer valid
476 * The now invalid exports will be deleted
477 * when the file system is dismounted or
478 * the file system is re-exported by mountd.
479 */
480 cr = NULL;
481 MNT_ILOCK(mp);
482 if (mp->mnt_exjail != NULL &&
483 mp->mnt_exjail->cr_prison == pr) {
484 cr = mp->mnt_exjail;
485 mp->mnt_exjail = NULL;
486 }
487 MNT_IUNLOCK(mp);
488 if (cr != NULL) {
489 crfree(cr);
490 i--;
491 }
492 if (i == 0)
493 break;
494 continue;
495 }
496 cr = NULL;
497 lockmgr(&mp->mnt_explock, LK_EXCLUSIVE, NULL);
498 MNT_ILOCK(mp);
499 if (mp->mnt_exjail != NULL &&
500 mp->mnt_exjail->cr_prison == pr) {
501 cr = mp->mnt_exjail;
502 mp->mnt_exjail = NULL;
503 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
504 MNT_IUNLOCK(mp);
505 vfs_free_addrlist(mp->mnt_export);
506 free(mp->mnt_export, M_MOUNT);
507 mp->mnt_export = NULL;
508 } else
509 MNT_IUNLOCK(mp);
510 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
511 if (cr != NULL) {
512 crfree(cr);
513 i--;
514 }
515 mtx_lock(&mountlist_mtx);
516 vfs_unbusy(mp);
517 if (i == 0)
518 break;
519 goto tryagain;
520 }
521 MNT_IUNLOCK(mp);
522 }
523 mtx_unlock(&mountlist_mtx);
524 }
525
526 /*
527 * Set the publicly exported filesystem (WebNFS). Currently, only
528 * one public filesystem is possible in the spec (RFC 2054 and 2055)
529 */
530 int
vfs_setpublicfs(struct mount * mp,struct netexport * nep,struct export_args * argp)531 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
532 struct export_args *argp)
533 {
534 int error;
535 struct vnode *rvp;
536 char *cp;
537
538 /*
539 * mp == NULL -> invalidate the current info, the FS is
540 * no longer exported. May be called from either vfs_export
541 * or unmount, so check if it hasn't already been done.
542 */
543 if (mp == NULL) {
544 if (nfs_pub.np_valid) {
545 nfs_pub.np_valid = 0;
546 if (nfs_pub.np_index != NULL) {
547 free(nfs_pub.np_index, M_TEMP);
548 nfs_pub.np_index = NULL;
549 }
550 }
551 return (0);
552 }
553
554 /*
555 * Only one allowed at a time.
556 */
557 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
558 return (EBUSY);
559
560 /*
561 * Get real filehandle for root of exported FS.
562 */
563 bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
564 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
565
566 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp)))
567 return (error);
568
569 if ((error = VOP_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
570 return (error);
571
572 vput(rvp);
573
574 /*
575 * If an indexfile was specified, pull it in.
576 */
577 if (argp->ex_indexfile != NULL) {
578 if (nfs_pub.np_index == NULL)
579 nfs_pub.np_index = malloc(MAXNAMLEN + 1, M_TEMP,
580 M_WAITOK);
581 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
582 MAXNAMLEN, (size_t *)0);
583 if (!error) {
584 /*
585 * Check for illegal filenames.
586 */
587 for (cp = nfs_pub.np_index; *cp; cp++) {
588 if (*cp == '/') {
589 error = EINVAL;
590 break;
591 }
592 }
593 }
594 if (error) {
595 free(nfs_pub.np_index, M_TEMP);
596 nfs_pub.np_index = NULL;
597 return (error);
598 }
599 }
600
601 nfs_pub.np_mount = mp;
602 nfs_pub.np_valid = 1;
603 return (0);
604 }
605
606 /*
607 * Used by the filesystems to determine if a given network address
608 * (passed in 'nam') is present in their exports list, returns a pointer
609 * to struct netcred so that the filesystem can examine it for
610 * access rights (read/write/etc).
611 */
612 static struct netcred *
vfs_export_lookup(struct mount * mp,struct sockaddr * nam)613 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
614 {
615 RADIX_NODE_HEAD_RLOCK_TRACKER;
616 struct netexport *nep;
617 struct netcred *np = NULL;
618 struct radix_node_head *rnh;
619 struct sockaddr *saddr;
620
621 nep = mp->mnt_export;
622 if (nep == NULL)
623 return (NULL);
624 if ((mp->mnt_flag & MNT_EXPORTED) == 0)
625 return (NULL);
626
627 /*
628 * Lookup in the export list
629 */
630 if (nam != NULL) {
631 saddr = nam;
632 rnh = NULL;
633 switch (saddr->sa_family) {
634 case AF_INET:
635 rnh = nep->ne4;
636 break;
637 case AF_INET6:
638 rnh = nep->ne6;
639 break;
640 }
641 if (rnh != NULL) {
642 RADIX_NODE_HEAD_RLOCK(rnh);
643 np = (struct netcred *) (*rnh->rnh_matchaddr)(saddr, &rnh->rh);
644 RADIX_NODE_HEAD_RUNLOCK(rnh);
645 if (np != NULL && (np->netc_rnodes->rn_flags & RNF_ROOT) != 0)
646 return (NULL);
647 }
648 }
649
650 /*
651 * If no address match, use the default if it exists.
652 */
653 if (np == NULL && (mp->mnt_flag & MNT_DEFEXPORTED) != 0)
654 return (&nep->ne_defexported);
655
656 return (np);
657 }
658
659 /*
660 * XXX: This comment comes from the deprecated ufs_check_export()
661 * XXX: and may not entirely apply, but lacking something better:
662 * This is the generic part of fhtovp called after the underlying
663 * filesystem has validated the file handle.
664 *
665 * Verify that a host should have access to a filesystem.
666 */
667
668 int
vfs_stdcheckexp(struct mount * mp,struct sockaddr * nam,uint64_t * extflagsp,struct ucred ** credanonp,int * numsecflavors,int * secflavors)669 vfs_stdcheckexp(struct mount *mp, struct sockaddr *nam, uint64_t *extflagsp,
670 struct ucred **credanonp, int *numsecflavors, int *secflavors)
671 {
672 struct netcred *np;
673
674 lockmgr(&mp->mnt_explock, LK_SHARED, NULL);
675 np = vfs_export_lookup(mp, nam);
676 if (np == NULL) {
677 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
678 *credanonp = NULL;
679 return (EACCES);
680 }
681 *extflagsp = np->netc_exflags;
682 if ((*credanonp = np->netc_anon) != NULL)
683 crhold(*credanonp);
684 if (numsecflavors) {
685 *numsecflavors = np->netc_numsecflavors;
686 KASSERT(*numsecflavors > 0,
687 ("%s: numsecflavors <= 0", __func__));
688 KASSERT(*numsecflavors < MAXSECFLAVORS,
689 ("%s: numsecflavors >= MAXSECFLAVORS", __func__));
690 }
691 if (secflavors && np->netc_numsecflavors > 0)
692 memcpy(secflavors, np->netc_secflavors, np->netc_numsecflavors *
693 sizeof(int));
694 lockmgr(&mp->mnt_explock, LK_RELEASE, NULL);
695 return (0);
696 }
697