1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * NFS exporting and validation.
4 *
5 * We maintain a list of clients, each of whic
6 * exports. To export an fs to a given client,
7 * to create the client entry with NFSCTL_ADDC
8 * creates a client control block and adds it
9 * table. Then, you call NFSCTL_EXPORT for eac
10 *
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@
13 */
14
15 #include <linux/slab.h>
16 #include <linux/namei.h>
17 #include <linux/module.h>
18 #include <linux/exportfs.h>
19 #include <linux/sunrpc/svc_xprt.h>
20
21 #include "nfsd.h"
22 #include "nfsfh.h"
23 #include "netns.h"
24 #include "pnfs.h"
25 #include "filecache.h"
26 #include "trace.h"
27
28 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
29
30 /*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export opt
33 * The other maps client+filehandle-fragment t
34 *
35 * The export options are actually stored in t
36 * second map contains a reference to the entr
37 */
38
39 #define EXPKEY_HASHBITS 8
40 #define EXPKEY_HASHMAX (1 << EXPKEY_H
41 #define EXPKEY_HASHMASK (EXPKEY_HASHMA
42
43 static void expkey_put(struct kref *ref)
44 {
45 struct svc_expkey *key = container_of(
46
47 if (test_bit(CACHE_VALID, &key->h.flag
48 !test_bit(CACHE_NEGATIVE, &key->h.
49 path_put(&key->ek_path);
50 auth_domain_put(key->ek_client);
51 kfree_rcu(key, ek_rcu);
52 }
53
54 static int expkey_upcall(struct cache_detail *
55 {
56 return sunrpc_cache_pipe_upcall(cd, h)
57 }
58
59 static void expkey_request(struct cache_detail
60 struct cache_head *
61 char **bpp, int *bl
62 {
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->na
68 snprintf(type, 5, "%d", ek->ek_fsidtyp
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_
71 (*bpp)[-1] = '\n';
72 }
73
74 static struct svc_expkey *svc_expkey_update(st
75 st
76 static struct svc_expkey *svc_expkey_lookup(st
77
78 static int expkey_parse(struct cache_detail *c
79 {
80 /* client fsidtype fsid expiry [path]
81 char *buf;
82 int len;
83 struct auth_domain *dom = NULL;
84 int err;
85 int fsidtype;
86 char *ep;
87 struct svc_expkey key;
88 struct svc_expkey *ek = NULL;
89
90 if (mesg[mlen - 1] != '\n')
91 return -EINVAL;
92 mesg[mlen-1] = 0;
93
94 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 err = -ENOMEM;
96 if (!buf)
97 goto out;
98
99 err = -EINVAL;
100 if (qword_get(&mesg, buf, PAGE_SIZE) <
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if (qword_get(&mesg, buf, PAGE_SIZE) <
111 goto out;
112 fsidtype = simple_strtoul(buf, &ep, 10
113 if (*ep)
114 goto out;
115 dprintk("found fsidtype %d\n", fsidtyp
116 if (key_len(fsidtype)==0) /* invalid t
117 goto out;
118 if ((len=qword_get(&mesg, buf, PAGE_SI
119 goto out;
120 dprintk("found fsid length %d\n", len)
121 if (len != key_len(fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 err = get_expiry(&mesg, &key.h.expiry_
127 if (err)
128 goto out;
129
130 key.ek_client = dom;
131 key.ek_fsidtype = fsidtype;
132 memcpy(key.ek_fsid, buf, len);
133
134 ek = svc_expkey_lookup(cd, &key);
135 err = -ENOMEM;
136 if (!ek)
137 goto out;
138
139 /* now we want a pathname, or empty me
140 err = -EINVAL;
141 len = qword_get(&mesg, buf, PAGE_SIZE)
142 if (len < 0)
143 goto out;
144 dprintk("Path seems to be <%s>\n", buf
145 err = 0;
146 if (len == 0) {
147 set_bit(CACHE_NEGATIVE, &key.h
148 ek = svc_expkey_update(cd, &ke
149 if (ek)
150 trace_nfsd_expkey_upda
151 else
152 err = -ENOMEM;
153 } else {
154 err = kern_path(buf, 0, &key.e
155 if (err)
156 goto out;
157
158 dprintk("Found the path %s\n",
159
160 ek = svc_expkey_update(cd, &ke
161 if (ek)
162 trace_nfsd_expkey_upda
163 else
164 err = -ENOMEM;
165 path_put(&key.ek_path);
166 }
167 cache_flush();
168 out:
169 if (ek)
170 cache_put(&ek->h, cd);
171 if (dom)
172 auth_domain_put(dom);
173 kfree(buf);
174 return err;
175 }
176
177 static int expkey_show(struct seq_file *m,
178 struct cache_detail *cd
179 struct cache_head *h)
180 {
181 struct svc_expkey *ek ;
182 int i;
183
184 if (h ==NULL) {
185 seq_puts(m, "#domain fsidtype
186 return 0;
187 }
188 ek = container_of(h, struct svc_expkey
189 seq_printf(m, "%s %d 0x", ek->ek_clien
190 ek->ek_fsidtype);
191 for (i=0; i < key_len(ek->ek_fsidtype)
192 seq_printf(m, "%08x", ek->ek_f
193 if (test_bit(CACHE_VALID, &h->flags) &
194 !test_bit(CACHE_NEGATIVE, &h->flag
195 seq_printf(m, " ");
196 seq_path(m, &ek->ek_path, "\\
197 }
198 seq_printf(m, "\n");
199 return 0;
200 }
201
202 static inline int expkey_match (struct cache_h
203 {
204 struct svc_expkey *orig = container_of
205 struct svc_expkey *new = container_of(
206
207 if (orig->ek_fsidtype != new->ek_fsidt
208 orig->ek_client != new->ek_client
209 memcmp(orig->ek_fsid, new->ek_fsid
210 return 0;
211 return 1;
212 }
213
214 static inline void expkey_init(struct cache_he
215 struct cach
216 {
217 struct svc_expkey *new = container_of(
218 struct svc_expkey *item = container_of
219
220 kref_get(&item->ek_client->ref);
221 new->ek_client = item->ek_client;
222 new->ek_fsidtype = item->ek_fsidtype;
223
224 memcpy(new->ek_fsid, item->ek_fsid, si
225 }
226
227 static inline void expkey_update(struct cache_
228 struct cach
229 {
230 struct svc_expkey *new = container_of(
231 struct svc_expkey *item = container_of
232
233 new->ek_path = item->ek_path;
234 path_get(&item->ek_path);
235 }
236
237 static struct cache_head *expkey_alloc(void)
238 {
239 struct svc_expkey *i = kmalloc(sizeof(
240 if (i)
241 return &i->h;
242 else
243 return NULL;
244 }
245
246 static void expkey_flush(void)
247 {
248 /*
249 * Take the nfsd_mutex here to ensure
250 * destroyed while we're in the middle
251 */
252 mutex_lock(&nfsd_mutex);
253 nfsd_file_cache_purge(current->nsproxy
254 mutex_unlock(&nfsd_mutex);
255 }
256
257 static const struct cache_detail svc_expkey_ca
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_upcall = expkey_upcall,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
270 .flush = expkey_flush,
271 };
272
273 static int
274 svc_expkey_hash(struct svc_expkey *item)
275 {
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHB
281 hash ^= hash_ptr(item->ek_client, EXPK
282 hash &= EXPKEY_HASHMASK;
283 return hash;
284 }
285
286 static struct svc_expkey *
287 svc_expkey_lookup(struct cache_detail *cd, str
288 {
289 struct cache_head *ch;
290 int hash = svc_expkey_hash(item);
291
292 ch = sunrpc_cache_lookup_rcu(cd, &item
293 if (ch)
294 return container_of(ch, struct
295 else
296 return NULL;
297 }
298
299 static struct svc_expkey *
300 svc_expkey_update(struct cache_detail *cd, str
301 struct svc_expkey *old)
302 {
303 struct cache_head *ch;
304 int hash = svc_expkey_hash(new);
305
306 ch = sunrpc_cache_update(cd, &new->h,
307 if (ch)
308 return container_of(ch, struct
309 else
310 return NULL;
311 }
312
313
314 #define EXPORT_HASHBITS 8
315 #define EXPORT_HASHMAX (1<< EXPORT_HA
316
317 static void nfsd4_fslocs_free(struct nfsd4_fs_
318 {
319 struct nfsd4_fs_location *locations =
320 int i;
321
322 if (!locations)
323 return;
324
325 for (i = 0; i < fsloc->locations_count
326 kfree(locations[i].path);
327 kfree(locations[i].hosts);
328 }
329
330 kfree(locations);
331 fsloc->locations = NULL;
332 }
333
334 static int export_stats_init(struct export_sta
335 {
336 stats->start_time = ktime_get_seconds(
337 return percpu_counter_init_many(stats-
338 EXP_ST
339 }
340
341 static void export_stats_reset(struct export_s
342 {
343 if (stats) {
344 int i;
345
346 for (i = 0; i < EXP_STATS_COUN
347 percpu_counter_set(&st
348 }
349 }
350
351 static void export_stats_destroy(struct export
352 {
353 if (stats)
354 percpu_counter_destroy_many(st
355 EX
356 }
357
358 static void svc_export_put(struct kref *ref)
359 {
360 struct svc_export *exp = container_of(
361 path_put(&exp->ex_path);
362 auth_domain_put(exp->ex_client);
363 nfsd4_fslocs_free(&exp->ex_fslocs);
364 export_stats_destroy(exp->ex_stats);
365 kfree(exp->ex_stats);
366 kfree(exp->ex_uuid);
367 kfree_rcu(exp, ex_rcu);
368 }
369
370 static int svc_export_upcall(struct cache_deta
371 {
372 return sunrpc_cache_pipe_upcall(cd, h)
373 }
374
375 static void svc_export_request(struct cache_de
376 struct cache_he
377 char **bpp, int
378 {
379 /* client path */
380 struct svc_export *exp = container_of(
381 char *pth;
382
383 qword_add(bpp, blen, exp->ex_client->n
384 pth = d_path(&exp->ex_path, *bpp, *ble
385 if (IS_ERR(pth)) {
386 /* is this correct? */
387 (*bpp)[0] = '\n';
388 return;
389 }
390 qword_add(bpp, blen, pth);
391 (*bpp)[-1] = '\n';
392 }
393
394 static struct svc_export *svc_export_update(st
395 st
396 static struct svc_export *svc_export_lookup(st
397
398 static int check_export(struct path *path, int
399 {
400 struct inode *inode = d_inode(path->de
401
402 /*
403 * We currently export only dirs, regu
404 * pseudoroot) symlinks.
405 */
406 if (!S_ISDIR(inode->i_mode) &&
407 !S_ISLNK(inode->i_mode) &&
408 !S_ISREG(inode->i_mode))
409 return -ENOTDIR;
410
411 /*
412 * Mountd should never pass down a wri
413 * just to make sure:
414 */
415 if (*flags & NFSEXP_V4ROOT)
416 *flags |= NFSEXP_READONLY;
417
418 /* There are two requirements on a fil
419 * 1: We must be able to identify the
420 * either a device number (so FS
421 * or an FSID number (so NFSEXP_
422 * 2: We must be able to find an inod
423 * This means that s_export_op m
424 * 3: We must not currently be on an i
425 */
426 if (!(inode->i_sb->s_type->fs_flags &
427 !(*flags & NFSEXP_FSID) &&
428 uuid == NULL) {
429 dprintk("exp_export: export of
430 return -EINVAL;
431 }
432
433 if (!exportfs_can_decode_fh(inode->i_s
434 dprintk("exp_export: export of
435 return -EINVAL;
436 }
437
438 if (is_idmapped_mnt(path->mnt)) {
439 dprintk("exp_export: export of
440 return -EINVAL;
441 }
442
443 if (inode->i_sb->s_export_op->flags &
444 !(*flags & NFSEXP_NOSUBTREECHECK))
445 dprintk("%s: %s does not suppo
446 __func__, inode->i_sb-
447 return -EINVAL;
448 }
449 return 0;
450 }
451
452 #ifdef CONFIG_NFSD_V4
453
454 static int
455 fsloc_parse(char **mesg, char *buf, struct nfs
456 {
457 int len;
458 int migrated, i, err;
459
460 /* more than one fsloc */
461 if (fsloc->locations)
462 return -EINVAL;
463
464 /* listsize */
465 err = get_uint(mesg, &fsloc->locations
466 if (err)
467 return err;
468 if (fsloc->locations_count > MAX_FS_LO
469 return -EINVAL;
470 if (fsloc->locations_count == 0)
471 return 0;
472
473 fsloc->locations = kcalloc(fsloc->loca
474 sizeof(stru
475 GFP_KERNEL)
476 if (!fsloc->locations)
477 return -ENOMEM;
478 for (i=0; i < fsloc->locations_count;
479 /* colon separated host list *
480 err = -EINVAL;
481 len = qword_get(mesg, buf, PAG
482 if (len <= 0)
483 goto out_free_all;
484 err = -ENOMEM;
485 fsloc->locations[i].hosts = ks
486 if (!fsloc->locations[i].hosts
487 goto out_free_all;
488 err = -EINVAL;
489 /* slash separated path compon
490 len = qword_get(mesg, buf, PAG
491 if (len <= 0)
492 goto out_free_all;
493 err = -ENOMEM;
494 fsloc->locations[i].path = kst
495 if (!fsloc->locations[i].path)
496 goto out_free_all;
497 }
498 /* migrated */
499 err = get_int(mesg, &migrated);
500 if (err)
501 goto out_free_all;
502 err = -EINVAL;
503 if (migrated < 0 || migrated > 1)
504 goto out_free_all;
505 fsloc->migrated = migrated;
506 return 0;
507 out_free_all:
508 nfsd4_fslocs_free(fsloc);
509 return err;
510 }
511
512 static int secinfo_parse(char **mesg, char *bu
513 {
514 struct exp_flavor_info *f;
515 u32 listsize;
516 int err;
517
518 /* more than one secinfo */
519 if (exp->ex_nflavors)
520 return -EINVAL;
521
522 err = get_uint(mesg, &listsize);
523 if (err)
524 return err;
525 if (listsize > MAX_SECINFO_LIST)
526 return -EINVAL;
527
528 for (f = exp->ex_flavors; f < exp->ex_
529 err = get_uint(mesg, &f->pseud
530 if (err)
531 return err;
532 /*
533 * XXX: It would be nice to al
534 * pseudoflavor is supported,
535 * problem at export time inst
536 * to authenticate.
537 */
538 err = get_uint(mesg, &f->flags
539 if (err)
540 return err;
541 /* Only some flags are allowed
542 if (~NFSEXP_SECINFO_FLAGS & (f
543 return -EINVAL;
544 }
545 exp->ex_nflavors = listsize;
546 return 0;
547 }
548
549 #else /* CONFIG_NFSD_V4 */
550 static inline int
551 fsloc_parse(char **mesg, char *buf, struct nfs
552 static inline int
553 secinfo_parse(char **mesg, char *buf, struct s
554 #endif
555
556 static int xprtsec_parse(char **mesg, char *bu
557 {
558 unsigned int i, mode, listsize;
559 int err;
560
561 err = get_uint(mesg, &listsize);
562 if (err)
563 return err;
564 if (listsize > NFSEXP_XPRTSEC_NUM)
565 return -EINVAL;
566
567 exp->ex_xprtsec_modes = 0;
568 for (i = 0; i < listsize; i++) {
569 err = get_uint(mesg, &mode);
570 if (err)
571 return err;
572 if (mode > NFSEXP_XPRTSEC_MTLS
573 return -EINVAL;
574 exp->ex_xprtsec_modes |= mode;
575 }
576 return 0;
577 }
578
579 static inline int
580 nfsd_uuid_parse(char **mesg, char *buf, unsign
581 {
582 int len;
583
584 /* more than one uuid */
585 if (*puuid)
586 return -EINVAL;
587
588 /* expect a 16 byte uuid encoded as \x
589 len = qword_get(mesg, buf, PAGE_SIZE);
590 if (len != EX_UUID_LEN)
591 return -EINVAL;
592
593 *puuid = kmemdup(buf, EX_UUID_LEN, GFP
594 if (*puuid == NULL)
595 return -ENOMEM;
596
597 return 0;
598 }
599
600 static int svc_export_parse(struct cache_detai
601 {
602 /* client path expiry [flags anonuid a
603 char *buf;
604 int err;
605 struct auth_domain *dom = NULL;
606 struct svc_export exp = {}, *expp;
607 int an_int;
608
609 if (mesg[mlen-1] != '\n')
610 return -EINVAL;
611 mesg[mlen-1] = 0;
612
613 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
614 if (!buf)
615 return -ENOMEM;
616
617 /* client */
618 err = -EINVAL;
619 if (qword_get(&mesg, buf, PAGE_SIZE) <
620 goto out;
621
622 err = -ENOENT;
623 dom = auth_domain_find(buf);
624 if (!dom)
625 goto out;
626
627 /* path */
628 err = -EINVAL;
629 if (qword_get(&mesg, buf, PAGE_SIZE) <
630 goto out1;
631
632 err = kern_path(buf, 0, &exp.ex_path);
633 if (err)
634 goto out1;
635
636 exp.ex_client = dom;
637 exp.cd = cd;
638 exp.ex_devid_map = NULL;
639 exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_
640
641 /* expiry */
642 err = get_expiry(&mesg, &exp.h.expiry_
643 if (err)
644 goto out3;
645
646 /* flags */
647 err = get_int(&mesg, &an_int);
648 if (err == -ENOENT) {
649 err = 0;
650 set_bit(CACHE_NEGATIVE, &exp.h
651 } else {
652 if (err || an_int < 0)
653 goto out3;
654 exp.ex_flags= an_int;
655
656 /* anon uid */
657 err = get_int(&mesg, &an_int);
658 if (err)
659 goto out3;
660 exp.ex_anon_uid= make_kuid(cur
661
662 /* anon gid */
663 err = get_int(&mesg, &an_int);
664 if (err)
665 goto out3;
666 exp.ex_anon_gid= make_kgid(cur
667
668 /* fsid */
669 err = get_int(&mesg, &an_int);
670 if (err)
671 goto out3;
672 exp.ex_fsid = an_int;
673
674 while (qword_get(&mesg, buf, P
675 if (strcmp(buf, "fsloc
676 err = fsloc_pa
677 else if (strcmp(buf, "
678 err = nfsd_uui
679 else if (strcmp(buf, "
680 err = secinfo_
681 else if (strcmp(buf, "
682 err = xprtsec_
683 else
684 /* quietly ign
685 * following.
686 * new values,
687 */
688 break;
689 if (err)
690 goto out4;
691 }
692
693 err = check_export(&exp.ex_pat
694 if (err)
695 goto out4;
696
697 /*
698 * No point caching this if it
699 * Also, this protects exportf
700 * anon_uid/anon_gid checks:
701 */
702 if (exp.h.expiry_time < second
703 goto out4;
704 /*
705 * For some reason exportfs ha
706 * invalid (-1) uid & gid on t
707 * uses to test export support
708 * sees errors from check_expo
709 * delay these checks till aft
710 */
711 err = -EINVAL;
712 if (!uid_valid(exp.ex_anon_uid
713 goto out4;
714 if (!gid_valid(exp.ex_anon_gid
715 goto out4;
716 err = 0;
717
718 nfsd4_setup_layout_type(&exp);
719 }
720
721 expp = svc_export_lookup(&exp);
722 if (!expp) {
723 err = -ENOMEM;
724 goto out4;
725 }
726 expp = svc_export_update(&exp, expp);
727 if (expp) {
728 trace_nfsd_export_update(expp)
729 cache_flush();
730 exp_put(expp);
731 } else
732 err = -ENOMEM;
733 out4:
734 nfsd4_fslocs_free(&exp.ex_fslocs);
735 kfree(exp.ex_uuid);
736 out3:
737 path_put(&exp.ex_path);
738 out1:
739 auth_domain_put(dom);
740 out:
741 kfree(buf);
742 return err;
743 }
744
745 static void exp_flags(struct seq_file *m, int
746 kuid_t anonu, kgid_t anong, st
747 static void show_secinfo(struct seq_file *m, s
748
749 static int is_export_stats_file(struct seq_fil
750 {
751 /*
752 * The export_stats file uses the same
753 * We use the file's name to determine
754 * There is no rename in nsfdfs, so d_
755 */
756 return !strcmp(m->file->f_path.dentry-
757 }
758
759 static int svc_export_show(struct seq_file *m,
760 struct cache_detail
761 struct cache_head *
762 {
763 struct svc_export *exp;
764 bool export_stats = is_export_stats_fi
765
766 if (h == NULL) {
767 if (export_stats)
768 seq_puts(m, "#path dom
769 else
770 seq_puts(m, "#path dom
771 return 0;
772 }
773 exp = container_of(h, struct svc_expor
774 seq_path(m, &exp->ex_path, " \t\n\\");
775 seq_putc(m, '\t');
776 seq_escape(m, exp->ex_client->name, "
777 if (export_stats) {
778 struct percpu_counter *counter
779
780 seq_printf(m, "\t%lld\n", exp-
781 seq_printf(m, "\tfh_stale: %ll
782 percpu_counter_sum_
783 seq_printf(m, "\tio_read: %lld
784 percpu_counter_sum_
785 seq_printf(m, "\tio_write: %ll
786 percpu_counter_sum_
787 seq_putc(m, '\n');
788 return 0;
789 }
790 seq_putc(m, '(');
791 if (test_bit(CACHE_VALID, &h->flags) &
792 !test_bit(CACHE_NEGATIVE, &h->flag
793 exp_flags(m, exp->ex_flags, ex
794 exp->ex_anon_uid, ex
795 if (exp->ex_uuid) {
796 int i;
797 seq_puts(m, ",uuid=");
798 for (i = 0; i < EX_UUI
799 if ((i&3) == 0
800 seq_pu
801 seq_printf(m,
802 }
803 }
804 show_secinfo(m, exp);
805 }
806 seq_puts(m, ")\n");
807 return 0;
808 }
809 static int svc_export_match(struct cache_head
810 {
811 struct svc_export *orig = container_of
812 struct svc_export *new = container_of(
813 return orig->ex_client == new->ex_clie
814 path_equal(&orig->ex_path, &ne
815 }
816
817 static void svc_export_init(struct cache_head
818 {
819 struct svc_export *new = container_of(
820 struct svc_export *item = container_of
821
822 kref_get(&item->ex_client->ref);
823 new->ex_client = item->ex_client;
824 new->ex_path = item->ex_path;
825 path_get(&item->ex_path);
826 new->ex_fslocs.locations = NULL;
827 new->ex_fslocs.locations_count = 0;
828 new->ex_fslocs.migrated = 0;
829 new->ex_layout_types = 0;
830 new->ex_uuid = NULL;
831 new->cd = item->cd;
832 export_stats_reset(new->ex_stats);
833 }
834
835 static void export_update(struct cache_head *c
836 {
837 struct svc_export *new = container_of(
838 struct svc_export *item = container_of
839 int i;
840
841 new->ex_flags = item->ex_flags;
842 new->ex_anon_uid = item->ex_anon_uid;
843 new->ex_anon_gid = item->ex_anon_gid;
844 new->ex_fsid = item->ex_fsid;
845 new->ex_devid_map = item->ex_devid_map
846 item->ex_devid_map = NULL;
847 new->ex_uuid = item->ex_uuid;
848 item->ex_uuid = NULL;
849 new->ex_fslocs.locations = item->ex_fs
850 item->ex_fslocs.locations = NULL;
851 new->ex_fslocs.locations_count = item-
852 item->ex_fslocs.locations_count = 0;
853 new->ex_fslocs.migrated = item->ex_fsl
854 item->ex_fslocs.migrated = 0;
855 new->ex_layout_types = item->ex_layout
856 new->ex_nflavors = item->ex_nflavors;
857 for (i = 0; i < MAX_SECINFO_LIST; i++)
858 new->ex_flavors[i] = item->ex_
859 }
860 new->ex_xprtsec_modes = item->ex_xprts
861 }
862
863 static struct cache_head *svc_export_alloc(voi
864 {
865 struct svc_export *i = kmalloc(sizeof(
866 if (!i)
867 return NULL;
868
869 i->ex_stats = kmalloc(sizeof(*(i->ex_s
870 if (!i->ex_stats) {
871 kfree(i);
872 return NULL;
873 }
874
875 if (export_stats_init(i->ex_stats)) {
876 kfree(i->ex_stats);
877 kfree(i);
878 return NULL;
879 }
880
881 return &i->h;
882 }
883
884 static const struct cache_detail svc_export_ca
885 .owner = THIS_MODULE,
886 .hash_size = EXPORT_HASHMAX,
887 .name = "nfsd.export",
888 .cache_put = svc_export_put,
889 .cache_upcall = svc_export_upcall,
890 .cache_request = svc_export_request,
891 .cache_parse = svc_export_parse,
892 .cache_show = svc_export_show,
893 .match = svc_export_match,
894 .init = svc_export_init,
895 .update = export_update,
896 .alloc = svc_export_alloc,
897 };
898
899 static int
900 svc_export_hash(struct svc_export *exp)
901 {
902 int hash;
903
904 hash = hash_ptr(exp->ex_client, EXPORT
905 hash ^= hash_ptr(exp->ex_path.dentry,
906 hash ^= hash_ptr(exp->ex_path.mnt, EXP
907 return hash;
908 }
909
910 static struct svc_export *
911 svc_export_lookup(struct svc_export *exp)
912 {
913 struct cache_head *ch;
914 int hash = svc_export_hash(exp);
915
916 ch = sunrpc_cache_lookup_rcu(exp->cd,
917 if (ch)
918 return container_of(ch, struct
919 else
920 return NULL;
921 }
922
923 static struct svc_export *
924 svc_export_update(struct svc_export *new, stru
925 {
926 struct cache_head *ch;
927 int hash = svc_export_hash(old);
928
929 ch = sunrpc_cache_update(old->cd, &new
930 if (ch)
931 return container_of(ch, struct
932 else
933 return NULL;
934 }
935
936
937 static struct svc_expkey *
938 exp_find_key(struct cache_detail *cd, struct a
939 u32 *fsidv, struct cache_req *req
940 {
941 struct svc_expkey key, *ek;
942 int err;
943
944 if (!clp)
945 return ERR_PTR(-ENOENT);
946
947 key.ek_client = clp;
948 key.ek_fsidtype = fsid_type;
949 memcpy(key.ek_fsid, fsidv, key_len(fsi
950
951 ek = svc_expkey_lookup(cd, &key);
952 if (ek == NULL)
953 return ERR_PTR(-ENOMEM);
954 err = cache_check(cd, &ek->h, reqp);
955 if (err) {
956 trace_nfsd_exp_find_key(&key,
957 return ERR_PTR(err);
958 }
959 return ek;
960 }
961
962 static struct svc_export *
963 exp_get_by_name(struct cache_detail *cd, struc
964 const struct path *path, struc
965 {
966 struct svc_export *exp, key;
967 int err;
968
969 if (!clp)
970 return ERR_PTR(-ENOENT);
971
972 key.ex_client = clp;
973 key.ex_path = *path;
974 key.cd = cd;
975
976 exp = svc_export_lookup(&key);
977 if (exp == NULL)
978 return ERR_PTR(-ENOMEM);
979 err = cache_check(cd, &exp->h, reqp);
980 if (err) {
981 trace_nfsd_exp_get_by_name(&ke
982 return ERR_PTR(err);
983 }
984 return exp;
985 }
986
987 /*
988 * Find the export entry for a given dentry.
989 */
990 static struct svc_export *
991 exp_parent(struct cache_detail *cd, struct aut
992 {
993 struct dentry *saved = dget(path->dent
994 struct svc_export *exp = exp_get_by_na
995
996 while (PTR_ERR(exp) == -ENOENT && !IS_
997 struct dentry *parent = dget_p
998 dput(path->dentry);
999 path->dentry = parent;
1000 exp = exp_get_by_name(cd, clp
1001 }
1002 dput(path->dentry);
1003 path->dentry = saved;
1004 return exp;
1005 }
1006
1007
1008
1009 /*
1010 * Obtain the root fh on behalf of a client.
1011 * This could be done in user space, but I fe
1012 * since its harder to fool a kernel module t
1013 */
1014 int
1015 exp_rootfh(struct net *net, struct auth_domai
1016 struct knfsd_fh *f, int maxsize)
1017 {
1018 struct svc_export *exp;
1019 struct path path;
1020 struct inode *inode;
1021 struct svc_fh fh;
1022 int err;
1023 struct nfsd_net *nn = net_gen
1024 struct cache_detail *cd = nn->svc
1025
1026 err = -EPERM;
1027 /* NB: we probably ought to check tha
1028 if (kern_path(name, 0, &path)) {
1029 printk("nfsd: exp_rootfh path
1030 return err;
1031 }
1032 inode = d_inode(path.dentry);
1033
1034 dprintk("nfsd: exp_rootfh(%s [%p] %s:
1035 name, path.dentry, clp->name
1036 inode->i_sb->s_id, inode->i_
1037 exp = exp_parent(cd, clp, &path);
1038 if (IS_ERR(exp)) {
1039 err = PTR_ERR(exp);
1040 goto out;
1041 }
1042
1043 /*
1044 * fh must be initialized before call
1045 */
1046 fh_init(&fh, maxsize);
1047 if (fh_compose(&fh, exp, path.dentry,
1048 err = -EINVAL;
1049 else
1050 err = 0;
1051 memcpy(f, &fh.fh_handle, sizeof(struc
1052 fh_put(&fh);
1053 exp_put(exp);
1054 out:
1055 path_put(&path);
1056 return err;
1057 }
1058
1059 static struct svc_export *exp_find(struct cac
1060 struct aut
1061 u32 *fsidv
1062 {
1063 struct svc_export *exp;
1064 struct nfsd_net *nn = net_generic(cd-
1065 struct svc_expkey *ek = exp_find_key(
1066 if (IS_ERR(ek))
1067 return ERR_CAST(ek);
1068
1069 exp = exp_get_by_name(cd, clp, &ek->e
1070 cache_put(&ek->h, nn->svc_expkey_cach
1071
1072 if (IS_ERR(exp))
1073 return ERR_CAST(exp);
1074 return exp;
1075 }
1076
1077 /**
1078 * check_nfsd_access - check if access to exp
1079 * @exp: svc_export that is being accessed.
1080 * @rqstp: svc_rqst attempting to access @exp
1081 *
1082 * Return values:
1083 * %nfs_ok if access is granted, or
1084 * %nfserr_wrongsec if access is denied
1085 */
1086 __be32 check_nfsd_access(struct svc_export *e
1087 {
1088 struct exp_flavor_info *f, *end = exp
1089 struct svc_xprt *xprt;
1090
1091 /*
1092 * If rqstp is NULL, this is a LOCALI
1093 * ever use a filehandle/credential p
1094 * been affirmed (by ACCESS or OPEN N
1095 * wire. So there is no need for furt
1096 */
1097 if (!rqstp)
1098 return nfs_ok;
1099
1100 xprt = rqstp->rq_xprt;
1101
1102 if (exp->ex_xprtsec_modes & NFSEXP_XP
1103 if (!test_bit(XPT_TLS_SESSION
1104 goto ok;
1105 }
1106 if (exp->ex_xprtsec_modes & NFSEXP_XP
1107 if (test_bit(XPT_TLS_SESSION,
1108 !test_bit(XPT_PEER_AUTH,
1109 goto ok;
1110 }
1111 if (exp->ex_xprtsec_modes & NFSEXP_XP
1112 if (test_bit(XPT_TLS_SESSION,
1113 test_bit(XPT_PEER_AUTH, &
1114 goto ok;
1115 }
1116 goto denied;
1117
1118 ok:
1119 /* legacy gss-only clients are always
1120 if (exp->ex_client == rqstp->rq_gsscl
1121 return nfs_ok;
1122 /* ip-address based client; check sec
1123 for (f = exp->ex_flavors; f < end; f+
1124 if (f->pseudoflavor == rqstp-
1125 return nfs_ok;
1126 }
1127 /* defaults in absence of sec= option
1128 if (exp->ex_nflavors == 0) {
1129 if (rqstp->rq_cred.cr_flavor
1130 rqstp->rq_cred.cr_flavor
1131 return nfs_ok;
1132 }
1133
1134 /* If the compound op contains a spo_
1135 * it will be sent with integrity/pro
1136 * will have to be expressly allowed
1137 * don't support it
1138 */
1139
1140 if (nfsd4_spo_must_allow(rqstp))
1141 return nfs_ok;
1142
1143 denied:
1144 return nfserr_wrongsec;
1145 }
1146
1147 /*
1148 * Uses rq_client and rq_gssclient to find an
1149 * auth_unix client) if it's available and ha
1150 * otherwise, will try to use rq_gssclient.
1151 *
1152 * Called from functions that handle requests
1153 * behalf of mountd are passed a single clien
1154 * use exp_get_by_name() or exp_find().
1155 */
1156 struct svc_export *
1157 rqst_exp_get_by_name(struct svc_rqst *rqstp,
1158 {
1159 struct svc_export *gssexp, *exp = ERR
1160 struct nfsd_net *nn = net_generic(SVC
1161 struct cache_detail *cd = nn->svc_exp
1162
1163 if (rqstp->rq_client == NULL)
1164 goto gss;
1165
1166 /* First try the auth_unix client: */
1167 exp = exp_get_by_name(cd, rqstp->rq_c
1168 if (PTR_ERR(exp) == -ENOENT)
1169 goto gss;
1170 if (IS_ERR(exp))
1171 return exp;
1172 /* If it has secinfo, assume there ar
1173 if (exp->ex_nflavors > 0)
1174 return exp;
1175 gss:
1176 /* Otherwise, try falling back on gss
1177 if (rqstp->rq_gssclient == NULL)
1178 return exp;
1179 gssexp = exp_get_by_name(cd, rqstp->r
1180 if (PTR_ERR(gssexp) == -ENOENT)
1181 return exp;
1182 if (!IS_ERR(exp))
1183 exp_put(exp);
1184 return gssexp;
1185 }
1186
1187 /**
1188 * rqst_exp_find - Find an svc_export in the
1189 * @reqp: The handle to be used to susp
1190 * If NULL, missing in-cache inf
1191 * @net: The network namespace in whic
1192 * @cl: default auth_domain to use fo
1193 * @gsscl: an alternate auth_domain defi
1194 * @fsid_type: The type of fsid to look for
1195 * @fsidv: The actual fsid to look up in
1196 *
1197 * Perform a lookup for @cl/@fsidv in the giv
1198 * none found and @gsscl specified, repeat th
1199 *
1200 * Returns an export, or an error pointer.
1201 */
1202 struct svc_export *
1203 rqst_exp_find(struct cache_req *reqp, struct
1204 struct auth_domain *cl, struct
1205 int fsid_type, u32 *fsidv)
1206 {
1207 struct nfsd_net *nn = net_generic(net
1208 struct svc_export *gssexp, *exp = ERR
1209 struct cache_detail *cd = nn->svc_exp
1210
1211 if (!cl)
1212 goto gss;
1213
1214 /* First try the auth_unix client: */
1215 exp = exp_find(cd, cl, fsid_type, fsi
1216 if (PTR_ERR(exp) == -ENOENT)
1217 goto gss;
1218 if (IS_ERR(exp))
1219 return exp;
1220 /* If it has secinfo, assume there ar
1221 if (exp->ex_nflavors > 0)
1222 return exp;
1223 gss:
1224 /* Otherwise, try falling back on gss
1225 if (!gsscl)
1226 return exp;
1227 gssexp = exp_find(cd, gsscl, fsid_typ
1228 if (PTR_ERR(gssexp) == -ENOENT)
1229 return exp;
1230 if (!IS_ERR(exp))
1231 exp_put(exp);
1232 return gssexp;
1233 }
1234
1235 struct svc_export *
1236 rqst_exp_parent(struct svc_rqst *rqstp, struc
1237 {
1238 struct dentry *saved = dget(path->den
1239 struct svc_export *exp = rqst_exp_get
1240
1241 while (PTR_ERR(exp) == -ENOENT && !IS
1242 struct dentry *parent = dget_
1243 dput(path->dentry);
1244 path->dentry = parent;
1245 exp = rqst_exp_get_by_name(rq
1246 }
1247 dput(path->dentry);
1248 path->dentry = saved;
1249 return exp;
1250 }
1251
1252 struct svc_export *rqst_find_fsidzero_export(
1253 {
1254 u32 fsidv[2];
1255
1256 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NUL
1257
1258 return rqst_exp_find(&rqstp->rq_chand
1259 rqstp->rq_client
1260 FSID_NUM, fsidv)
1261 }
1262
1263 /*
1264 * Called when we need the filehandle for the
1265 * for a given NFSv4 client. The root is de
1266 * export point with fsid==0
1267 */
1268 __be32
1269 exp_pseudoroot(struct svc_rqst *rqstp, struct
1270 {
1271 struct svc_export *exp;
1272 __be32 rv;
1273
1274 exp = rqst_find_fsidzero_export(rqstp
1275 if (IS_ERR(exp))
1276 return nfserrno(PTR_ERR(exp))
1277 rv = fh_compose(fhp, exp, exp->ex_pat
1278 exp_put(exp);
1279 return rv;
1280 }
1281
1282 static struct flags {
1283 int flag;
1284 char *name[2];
1285 } expflags[] = {
1286 { NFSEXP_READONLY, {"ro", "rw"}},
1287 { NFSEXP_INSECURE_PORT, {"insecure",
1288 { NFSEXP_ROOTSQUASH, {"root_squash",
1289 { NFSEXP_ALLSQUASH, {"all_squash", ""
1290 { NFSEXP_ASYNC, {"async", "sync"}},
1291 { NFSEXP_GATHERED_WRITES, {"wdelay",
1292 { NFSEXP_NOREADDIRPLUS, {"nordirplus"
1293 { NFSEXP_NOHIDE, {"nohide", ""}},
1294 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}
1295 { NFSEXP_NOSUBTREECHECK, {"no_subtree
1296 { NFSEXP_NOAUTHNLM, {"insecure_locks"
1297 { NFSEXP_V4ROOT, {"v4root", ""}},
1298 { NFSEXP_PNFS, {"pnfs", ""}},
1299 { NFSEXP_SECURITY_LABEL, {"security_l
1300 { 0, {"", ""}}
1301 };
1302
1303 static void show_expflags(struct seq_file *m,
1304 {
1305 struct flags *flg;
1306 int state, first = 0;
1307
1308 for (flg = expflags; flg->flag; flg++
1309 if (flg->flag & ~mask)
1310 continue;
1311 state = (flg->flag & flags) ?
1312 if (*flg->name[state])
1313 seq_printf(m, "%s%s",
1314 }
1315 }
1316
1317 static void show_secinfo_flags(struct seq_fil
1318 {
1319 seq_printf(m, ",");
1320 show_expflags(m, flags, NFSEXP_SECINF
1321 }
1322
1323 static bool secinfo_flags_equal(int f, int g)
1324 {
1325 f &= NFSEXP_SECINFO_FLAGS;
1326 g &= NFSEXP_SECINFO_FLAGS;
1327 return f == g;
1328 }
1329
1330 static int show_secinfo_run(struct seq_file *
1331 {
1332 int flags;
1333
1334 flags = (*fp)->flags;
1335 seq_printf(m, ",sec=%d", (*fp)->pseud
1336 (*fp)++;
1337 while (*fp != end && secinfo_flags_eq
1338 seq_printf(m, ":%d", (*fp)->p
1339 (*fp)++;
1340 }
1341 return flags;
1342 }
1343
1344 static void show_secinfo(struct seq_file *m,
1345 {
1346 struct exp_flavor_info *f;
1347 struct exp_flavor_info *end = exp->ex
1348 int flags;
1349
1350 if (exp->ex_nflavors == 0)
1351 return;
1352 f = exp->ex_flavors;
1353 flags = show_secinfo_run(m, &f, end);
1354 if (!secinfo_flags_equal(flags, exp->
1355 show_secinfo_flags(m, flags);
1356 while (f != end) {
1357 flags = show_secinfo_run(m, &
1358 show_secinfo_flags(m, flags);
1359 }
1360 }
1361
1362 static void exp_flags(struct seq_file *m, int
1363 kuid_t anonu, kgid_t anong, s
1364 {
1365 struct user_namespace *userns = m->fi
1366
1367 show_expflags(m, flag, NFSEXP_ALLFLAG
1368 if (flag & NFSEXP_FSID)
1369 seq_printf(m, ",fsid=%d", fsi
1370 if (!uid_eq(anonu, make_kuid(userns,
1371 !uid_eq(anonu, make_kuid(userns,
1372 seq_printf(m, ",anonuid=%u",
1373 if (!gid_eq(anong, make_kgid(userns,
1374 !gid_eq(anong, make_kgid(userns,
1375 seq_printf(m, ",anongid=%u",
1376 if (fsloc && fsloc->locations_count >
1377 char *loctype = (fsloc->migra
1378 int i;
1379
1380 seq_printf(m, ",%s=", loctype
1381 seq_escape(m, fsloc->location
1382 seq_putc(m, '@');
1383 seq_escape(m, fsloc->location
1384 for (i = 1; i < fsloc->locati
1385 seq_putc(m, ';');
1386 seq_escape(m, fsloc->
1387 seq_putc(m, '@');
1388 seq_escape(m, fsloc->
1389 }
1390 }
1391 }
1392
1393 static int e_show(struct seq_file *m, void *p
1394 {
1395 struct cache_head *cp = p;
1396 struct svc_export *exp = container_of
1397 struct cache_detail *cd = m->private;
1398 bool export_stats = is_export_stats_f
1399
1400 if (p == SEQ_START_TOKEN) {
1401 seq_puts(m, "# Version 1.1\n"
1402 if (export_stats)
1403 seq_puts(m, "# Path C
1404 else
1405 seq_puts(m, "# Path C
1406 return 0;
1407 }
1408
1409 exp_get(exp);
1410 if (cache_check(cd, &exp->h, NULL))
1411 return 0;
1412 exp_put(exp);
1413 return svc_export_show(m, cd, cp);
1414 }
1415
1416 const struct seq_operations nfs_exports_op =
1417 .start = cache_seq_start_rcu,
1418 .next = cache_seq_next_rcu,
1419 .stop = cache_seq_stop_rcu,
1420 .show = e_show,
1421 };
1422
1423 /*
1424 * Initialize the exports module.
1425 */
1426 int
1427 nfsd_export_init(struct net *net)
1428 {
1429 int rv;
1430 struct nfsd_net *nn = net_generic(net
1431
1432 dprintk("nfsd: initializing export mo
1433
1434 nn->svc_export_cache = cache_create_n
1435 if (IS_ERR(nn->svc_export_cache))
1436 return PTR_ERR(nn->svc_export
1437 rv = cache_register_net(nn->svc_expor
1438 if (rv)
1439 goto destroy_export_cache;
1440
1441 nn->svc_expkey_cache = cache_create_n
1442 if (IS_ERR(nn->svc_expkey_cache)) {
1443 rv = PTR_ERR(nn->svc_expkey_c
1444 goto unregister_export_cache;
1445 }
1446 rv = cache_register_net(nn->svc_expke
1447 if (rv)
1448 goto destroy_expkey_cache;
1449 return 0;
1450
1451 destroy_expkey_cache:
1452 cache_destroy_net(nn->svc_expkey_cach
1453 unregister_export_cache:
1454 cache_unregister_net(nn->svc_export_c
1455 destroy_export_cache:
1456 cache_destroy_net(nn->svc_export_cach
1457 return rv;
1458 }
1459
1460 /*
1461 * Flush exports table - called when last nfs
1462 */
1463 void
1464 nfsd_export_flush(struct net *net)
1465 {
1466 struct nfsd_net *nn = net_generic(net
1467
1468 cache_purge(nn->svc_expkey_cache);
1469 cache_purge(nn->svc_export_cache);
1470 }
1471
1472 /*
1473 * Shutdown the exports module.
1474 */
1475 void
1476 nfsd_export_shutdown(struct net *net)
1477 {
1478 struct nfsd_net *nn = net_generic(net
1479
1480 dprintk("nfsd: shutting down export m
1481
1482 cache_unregister_net(nn->svc_expkey_c
1483 cache_unregister_net(nn->svc_export_c
1484 cache_destroy_net(nn->svc_expkey_cach
1485 cache_destroy_net(nn->svc_export_cach
1486 svcauth_unix_purge(net);
1487
1488 dprintk("nfsd: export shutdown comple
1489 }
1490
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