-
Notifications
You must be signed in to change notification settings - Fork 24
/
nfs_export.c
850 lines (750 loc) · 21.4 KB
/
nfs_export.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
/* $NetBSD: nfs_export.c,v 1.30.6.1 2007/12/09 19:38:43 jmcneill Exp $ */
/*-
* Copyright (c) 1997, 1998, 2004, 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
* This code is derived from software contributed to The NetBSD Foundation
* by Julio M. Merino Vidal.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94
*/
/*
* VFS exports list management.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nfs_export.c,v 1.30.6.1 2007/12/09 19:38:43 jmcneill Exp $");
#include "opt_compat_netbsd.h"
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/dirent.h>
#include <sys/socket.h> /* XXX for AF_MAX */
#include <sys/kauth.h>
#include <net/radix.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfs_var.h>
/*
* Network address lookup element.
*/
struct netcred {
struct radix_node netc_rnodes[2];
int netc_refcnt;
int netc_exflags;
kauth_cred_t netc_anon;
};
/*
* Network export information.
*/
struct netexport {
CIRCLEQ_ENTRY(netexport) ne_list;
struct mount *ne_mount;
struct netcred ne_defexported; /* Default export */
struct radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
};
CIRCLEQ_HEAD(, netexport) netexport_list =
CIRCLEQ_HEAD_INITIALIZER(netexport_list);
/* Malloc type used by the mount<->netexport map. */
MALLOC_DEFINE(M_NFS_EXPORT, "nfs_export", "NFS export data");
/* Publicly exported file system. */
struct nfs_public nfs_pub;
/*
* Local prototypes.
*/
static int init_exports(struct mount *, struct netexport **);
static int hang_addrlist(struct mount *, struct netexport *,
const struct export_args *);
static int sacheck(struct sockaddr *);
static int free_netcred(struct radix_node *, void *);
static int export(struct netexport *, const struct export_args *);
static int setpublicfs(struct mount *, struct netexport *,
const struct export_args *);
static struct netcred *netcred_lookup(struct netexport *, struct mbuf *);
static struct netexport *netexport_lookup(const struct mount *);
static struct netexport *netexport_lookup_byfsid(const fsid_t *);
static void netexport_clear(struct netexport *);
static void netexport_insert(struct netexport *);
static void netexport_remove(struct netexport *);
static void netexport_wrlock(void);
static void netexport_wrunlock(void);
/*
* PUBLIC INTERFACE
*/
/*
* Declare and initialize the file system export hooks.
*/
static void nfs_export_unmount(struct mount *);
struct vfs_hooks nfs_export_hooks = {
nfs_export_unmount
};
VFS_HOOKS_ATTACH(nfs_export_hooks);
/*
* VFS unmount hook for NFS exports.
*
* Releases NFS exports list resources if the given mount point has some.
* As allocation happens lazily, it may be that it doesn't has this
* information, although it theorically should.
*/
static void
nfs_export_unmount(struct mount *mp)
{
struct netexport *ne;
KASSERT(mp != NULL);
netexport_wrlock();
ne = netexport_lookup(mp);
if (ne == NULL) {
netexport_wrunlock();
return;
}
netexport_clear(ne);
netexport_remove(ne);
netexport_wrunlock();
free(ne, M_NFS_EXPORT);
}
/*
* Atomically set the NFS exports list of the given file system, replacing
* it with a new list of entries.
*
* Returns zero on success or an appropriate error code otherwise.
*
* Helper function for the nfssvc(2) system call (NFSSVC_SETEXPORTSLIST
* command).
*/
int
mountd_set_exports_list(const struct mountd_exports_list *mel, struct lwp *l)
{
int error;
#ifdef notyet
/* XXX: See below to see the reason why this is disabled. */
size_t i;
#endif
struct mount *mp;
struct netexport *ne;
struct nameidata nd;
struct vnode *vp;
struct fid *fid;
size_t fid_size;
if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER,
NULL) != 0)
return EPERM;
/* Lookup the file system path. */
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, mel->mel_path);
error = namei(&nd);
if (error != 0)
return error;
vp = nd.ni_vp;
mp = vp->v_mount;
fid_size = 0;
if ((error = VFS_VPTOFH(vp, NULL, &fid_size)) == E2BIG) {
fid = malloc(fid_size, M_TEMP, M_NOWAIT);
if (fid != NULL) {
error = VFS_VPTOFH(vp, fid, &fid_size);
free(fid, M_TEMP);
}
}
if (error != 0) {
vput(vp);
return EOPNOTSUPP;
}
/* Mark the file system busy. */
error = vfs_busy(mp, LK_NOWAIT, NULL);
vput(vp);
if (error != 0)
return error;
netexport_wrlock();
ne = netexport_lookup(mp);
if (ne == NULL) {
error = init_exports(mp, &ne);
if (error != 0) {
goto out;
}
}
KASSERT(ne != NULL);
KASSERT(ne->ne_mount == mp);
/*
* XXX: The part marked as 'notyet' works fine from the kernel's
* point of view, in the sense that it is able to atomically update
* the complete exports list for a file system. However, supporting
* this in mountd(8) requires a lot of work; so, for now, keep the
* old behavior of updating a single entry per call.
*
* When mountd(8) is fixed, just remove the second branch of this
* preprocessor conditional and enable the first one.
*/
#ifdef notyet
netexport_clear(ne);
for (i = 0; error == 0 && i < mel->mel_nexports; i++)
error = export(ne, &mel->mel_exports[i]);
#else
if (mel->mel_nexports == 0)
netexport_clear(ne);
else if (mel->mel_nexports == 1)
error = export(ne, &mel->mel_exports[0]);
else {
printf("mountd_set_exports_list: Cannot set more than one "
"entry at once (unimplemented)\n");
error = EOPNOTSUPP;
}
#endif
out:
netexport_wrunlock();
vfs_unbusy(mp);
return error;
}
static void
netexport_insert(struct netexport *ne)
{
CIRCLEQ_INSERT_HEAD(&netexport_list, ne, ne_list);
}
static void
netexport_remove(struct netexport *ne)
{
CIRCLEQ_REMOVE(&netexport_list, ne, ne_list);
}
static struct netexport *
netexport_lookup(const struct mount *mp)
{
struct netexport *ne;
CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) {
if (ne->ne_mount == mp) {
goto done;
}
}
ne = NULL;
done:
return ne;
}
static struct netexport *
netexport_lookup_byfsid(const fsid_t *fsid)
{
struct netexport *ne;
CIRCLEQ_FOREACH(ne, &netexport_list, ne_list) {
const struct mount *mp = ne->ne_mount;
if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] &&
mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) {
goto done;
}
}
ne = NULL;
done:
return ne;
}
/*
* Check if the file system specified by the 'mp' mount structure is
* exported to a client with 'anon' anonymous credentials. The 'mb'
* argument is an mbuf containing the network address of the client.
* The return parameters for the export flags for the client are returned
* in the address specified by 'wh'.
*
* This function is used exclusively by the NFS server. It is generally
* invoked before VFS_FHTOVP to validate that client has access to the
* file system.
*/
int
netexport_check(const fsid_t *fsid, struct mbuf *mb, struct mount **mpp,
int *wh, kauth_cred_t *anon)
{
struct netexport *ne;
struct netcred *np;
ne = netexport_lookup_byfsid(fsid);
if (ne == NULL) {
return EACCES;
}
np = netcred_lookup(ne, mb);
if (np == NULL) {
return EACCES;
}
*mpp = ne->ne_mount;
*wh = np->netc_exflags;
*anon = np->netc_anon;
return 0;
}
#ifdef COMPAT_30
/*
* Handles legacy export requests. In this case, the export information
* is hardcoded in a specific place of the mount arguments structure (given
* in data); the request for an update is given through the fspec field
* (also in a known location), which must be a null pointer.
*
* Returns EJUSTRETURN if the given command was not a export request.
* Otherwise, returns 0 on success or an appropriate error code otherwise.
*/
int
nfs_update_exports_30(struct mount *mp, const char *path,
struct mnt_export_args30 *args, struct lwp *l)
{
struct mountd_exports_list mel;
mel.mel_path = path;
if (args->fspec != NULL)
return EJUSTRETURN;
if (args->eargs.ex_flags & 0x00020000) {
/* Request to delete exports. The mask above holds the
* value that used to be in MNT_DELEXPORT. */
mel.mel_nexports = 0;
} else {
/* The following assumes export_args has not changed since
* export_args30 - typedef checks sizes. */
typedef char x[sizeof args->eargs == sizeof *mel.mel_exports ? 1 : -1];
mel.mel_nexports = 1;
mel.mel_exports = (void *)&args->eargs;
}
return mountd_set_exports_list(&mel, l);
}
#endif
/*
* INTERNAL FUNCTIONS
*/
/*
* Initializes NFS exports for the file system given in 'mp' if it supports
* file handles; this is determined by checking whether mp's vfs_vptofh and
* vfs_fhtovp operations are NULL or not.
*
* If successful, returns 0 and sets *mnpp to the address of the new
* mount_netexport_pair item; otherwise returns an appropriate error code
* and *mnpp remains unmodified.
*/
static int
init_exports(struct mount *mp, struct netexport **nep)
{
int error;
struct export_args ea;
struct netexport *ne;
KASSERT(mp != NULL);
/* Ensure that we do not already have this mount point. */
KASSERT(netexport_lookup(mp) == NULL);
ne = malloc(sizeof(*ne), M_NFS_EXPORT, M_WAITOK | M_ZERO);
ne->ne_mount = mp;
/* Set the default export entry. Handled internally by export upon
* first call. */
memset(&ea, 0, sizeof(ea));
ea.ex_root = -2;
if (mp->mnt_flag & MNT_RDONLY)
ea.ex_flags |= MNT_EXRDONLY;
error = export(ne, &ea);
if (error != 0) {
free(ne, M_NFS_EXPORT);
} else {
netexport_insert(ne);
*nep = ne;
}
return error;
}
/*
* Build hash lists of net addresses and hang them off the mount point.
* Called by export() to set up a new entry in the lists of export
* addresses.
*/
static int
hang_addrlist(struct mount *mp, struct netexport *nep,
const struct export_args *argp)
{
int error, i;
struct netcred *np, *enp;
struct radix_node_head *rnh;
struct sockaddr *saddr, *smask;
struct domain *dom;
smask = NULL;
if (argp->ex_addrlen == 0) {
if (mp->mnt_flag & MNT_DEFEXPORTED)
return EPERM;
np = &nep->ne_defexported;
KASSERT(np->netc_anon == NULL);
np->netc_anon = kauth_cred_alloc();
np->netc_exflags = argp->ex_flags;
kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon);
mp->mnt_flag |= MNT_DEFEXPORTED;
return 0;
}
if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN)
return EINVAL;
i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
np = malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
np->netc_anon = kauth_cred_alloc();
saddr = (struct sockaddr *)(np + 1);
error = copyin(argp->ex_addr, saddr, argp->ex_addrlen);
if (error)
goto out;
if (saddr->sa_len > argp->ex_addrlen)
saddr->sa_len = argp->ex_addrlen;
if (sacheck(saddr) == -1)
return EINVAL;
if (argp->ex_masklen) {
smask = (struct sockaddr *)((char *)saddr + argp->ex_addrlen);
error = copyin(argp->ex_mask, smask, argp->ex_masklen);
if (error)
goto out;
if (smask->sa_len > argp->ex_masklen)
smask->sa_len = argp->ex_masklen;
if (smask->sa_family != saddr->sa_family)
return EINVAL;
if (sacheck(smask) == -1)
return EINVAL;
}
i = saddr->sa_family;
if ((rnh = nep->ne_rtable[i]) == 0) {
/*
* Seems silly to initialize every AF when most are not
* used, do so on demand here
*/
DOMAIN_FOREACH(dom) {
if (dom->dom_family == i && dom->dom_rtattach) {
dom->dom_rtattach((void **)&nep->ne_rtable[i],
dom->dom_rtoffset);
break;
}
}
if ((rnh = nep->ne_rtable[i]) == 0) {
error = ENOBUFS;
goto out;
}
}
enp = (struct netcred *)(*rnh->rnh_addaddr)(saddr, smask, rnh,
np->netc_rnodes);
if (enp != np) {
if (enp == NULL) {
enp = (struct netcred *)(*rnh->rnh_lookup)(saddr,
smask, rnh);
if (enp == NULL) {
error = EPERM;
goto out;
}
} else
enp->netc_refcnt++;
goto check;
} else
enp->netc_refcnt = 1;
np->netc_exflags = argp->ex_flags;
kauth_uucred_to_cred(np->netc_anon, &argp->ex_anon);
return 0;
check:
if (enp->netc_exflags != argp->ex_flags ||
kauth_cred_uucmp(enp->netc_anon, &argp->ex_anon) != 0)
error = EPERM;
else
error = 0;
out:
KASSERT(np->netc_anon != NULL);
kauth_cred_free(np->netc_anon);
free(np, M_NETADDR);
return error;
}
/*
* Ensure that the address stored in 'sa' is valid.
* Returns zero on success, otherwise -1.
*/
static int
sacheck(struct sockaddr *sa)
{
switch (sa->sa_family) {
#ifdef INET
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
char *p = (char *)sin->sin_zero;
size_t i;
if (sin->sin_len != sizeof(*sin))
return -1;
if (sin->sin_port != 0)
return -1;
for (i = 0; i < sizeof(sin->sin_zero); i++)
if (*p++ != '\0')
return -1;
return 0;
}
#endif
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
if (sin6->sin6_len != sizeof(*sin6))
return -1;
if (sin6->sin6_port != 0)
return -1;
return 0;
}
#endif
default:
return -1;
}
}
/*
* Free the netcred object pointed to by the 'rn' radix node.
* 'w' holds a pointer to the radix tree head.
*/
static int
free_netcred(struct radix_node *rn, void *w)
{
struct radix_node_head *rnh = (struct radix_node_head *)w;
struct netcred *np = (struct netcred *)(void *)rn;
(*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh);
if (--(np->netc_refcnt) <= 0) {
KASSERT(np->netc_anon != NULL);
kauth_cred_free(np->netc_anon);
free(np, M_NETADDR);
}
return 0;
}
/*
* Clears the exports list for a given file system.
*/
static void
netexport_clear(struct netexport *ne)
{
struct radix_node_head *rnh;
struct mount *mp = ne->ne_mount;
int i;
if (mp->mnt_flag & MNT_EXPUBLIC) {
setpublicfs(NULL, NULL, NULL);
mp->mnt_flag &= ~MNT_EXPUBLIC;
}
for (i = 0; i <= AF_MAX; i++) {
if ((rnh = ne->ne_rtable[i]) != NULL) {
rn_walktree(rnh, free_netcred, rnh);
free(rnh, M_RTABLE);
ne->ne_rtable[i] = NULL;
}
}
if ((mp->mnt_flag & MNT_DEFEXPORTED) != 0) {
struct netcred *np = &ne->ne_defexported;
KASSERT(np->netc_anon != NULL);
kauth_cred_free(np->netc_anon);
np->netc_anon = NULL;
} else {
KASSERT(ne->ne_defexported.netc_anon == NULL);
}
mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
}
/*
* Add a new export entry (described by an export_args structure) to the
* given file system.
*/
static int
export(struct netexport *nep, const struct export_args *argp)
{
struct mount *mp = nep->ne_mount;
int error;
if (argp->ex_flags & MNT_EXPORTED) {
if (argp->ex_flags & MNT_EXPUBLIC) {
if ((error = setpublicfs(mp, nep, argp)) != 0)
return error;
mp->mnt_flag |= MNT_EXPUBLIC;
}
if ((error = hang_addrlist(mp, nep, argp)) != 0)
return error;
mp->mnt_flag |= MNT_EXPORTED;
}
return 0;
}
/*
* Set the publicly exported filesystem (WebNFS). Currently, only
* one public filesystem is possible in the spec (RFC 2054 and 2055)
*/
static int
setpublicfs(struct mount *mp, struct netexport *nep,
const struct export_args *argp)
{
char *cp;
int error;
struct vnode *rvp;
size_t fhsize;
/*
* mp == NULL -> invalidate the current info, the FS is
* no longer exported. May be called from either export
* or unmount, so check if it hasn't already been done.
*/
if (mp == NULL) {
if (nfs_pub.np_valid) {
nfs_pub.np_valid = 0;
if (nfs_pub.np_handle != NULL) {
free(nfs_pub.np_handle, M_TEMP);
nfs_pub.np_handle = NULL;
}
if (nfs_pub.np_index != NULL) {
FREE(nfs_pub.np_index, M_TEMP);
nfs_pub.np_index = NULL;
}
}
return 0;
}
/*
* Only one allowed at a time.
*/
if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
return EBUSY;
/*
* Get real filehandle for root of exported FS.
*/
if ((error = VFS_ROOT(mp, &rvp)))
return error;
fhsize = 0;
error = vfs_composefh(rvp, NULL, &fhsize);
if (error != E2BIG)
return error;
nfs_pub.np_handle = malloc(fhsize, M_TEMP, M_NOWAIT);
if (nfs_pub.np_handle == NULL)
error = ENOMEM;
else
error = vfs_composefh(rvp, nfs_pub.np_handle, &fhsize);
if (error)
return error;
vput(rvp);
/*
* If an indexfile was specified, pull it in.
*/
if (argp->ex_indexfile != NULL) {
MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
M_WAITOK);
error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
MAXNAMLEN, (size_t *)0);
if (!error) {
/*
* Check for illegal filenames.
*/
for (cp = nfs_pub.np_index; *cp; cp++) {
if (*cp == '/') {
error = EINVAL;
break;
}
}
}
if (error) {
FREE(nfs_pub.np_index, M_TEMP);
return error;
}
}
nfs_pub.np_mount = mp;
nfs_pub.np_valid = 1;
return 0;
}
/*
* Lookup an export entry in the exports list that matches the address
* stored in 'nam'. If no entry is found, the default one is used instead
* (if available).
*/
static struct netcred *
netcred_lookup(struct netexport *ne, struct mbuf *nam)
{
struct netcred *np;
struct radix_node_head *rnh;
struct sockaddr *saddr;
if ((ne->ne_mount->mnt_flag & MNT_EXPORTED) == 0) {
return NULL;
}
/*
* Lookup in the export list first.
*/
np = NULL;
if (nam != NULL) {
saddr = mtod(nam, struct sockaddr *);
rnh = ne->ne_rtable[saddr->sa_family];
if (rnh != NULL) {
np = (struct netcred *)
(*rnh->rnh_matchaddr)((void *)saddr,
rnh);
if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
np = NULL;
}
}
/*
* If no address match, use the default if it exists.
*/
if (np == NULL && ne->ne_mount->mnt_flag & MNT_DEFEXPORTED)
np = &ne->ne_defexported;
return np;
}
krwlock_t netexport_lock;
void
netexport_rdlock(void)
{
rw_enter(&netexport_lock, RW_READER);
}
void
netexport_rdunlock(void)
{
rw_exit(&netexport_lock);
}
static void
netexport_wrlock(void)
{
rw_enter(&netexport_lock, RW_WRITER);
}
static void
netexport_wrunlock(void)
{
rw_exit(&netexport_lock);
}