1 // SPDX-License-Identifier: GPL-2.0
3 * NFS exporting and validation.
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
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>
25 #include "filecache.h"
28 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
39 #define EXPKEY_HASHBITS 8
40 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
43 static void expkey_put(struct kref
*ref
)
45 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
47 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
48 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
))
49 path_put(&key
->ek_path
);
50 auth_domain_put(key
->ek_client
);
51 kfree_rcu(key
, ek_rcu
);
54 static int expkey_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
56 return sunrpc_cache_pipe_upcall(cd
, h
);
59 static void expkey_request(struct cache_detail
*cd
,
61 char **bpp
, int *blen
)
63 /* client fsidtype \xfsid */
64 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
67 qword_add(bpp
, blen
, ek
->ek_client
->name
);
68 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
69 qword_add(bpp
, blen
, type
);
70 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
74 static struct svc_expkey
*svc_expkey_update(struct cache_detail
*cd
, struct svc_expkey
*new,
75 struct svc_expkey
*old
);
76 static struct svc_expkey
*svc_expkey_lookup(struct cache_detail
*cd
, struct svc_expkey
*);
78 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
80 /* client fsidtype fsid expiry [path] */
83 struct auth_domain
*dom
= NULL
;
87 struct svc_expkey key
;
88 struct svc_expkey
*ek
= NULL
;
90 if (mesg
[mlen
- 1] != '\n')
94 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
100 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
104 dom
= auth_domain_find(buf
);
107 dprintk("found domain %s\n", buf
);
110 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
112 fsidtype
= simple_strtoul(buf
, &ep
, 10);
115 dprintk("found fsidtype %d\n", fsidtype
);
116 if (key_len(fsidtype
)==0) /* invalid type */
118 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
120 dprintk("found fsid length %d\n", len
);
121 if (len
!= key_len(fsidtype
))
124 /* OK, we seem to have a valid key */
126 err
= get_expiry(&mesg
, &key
.h
.expiry_time
);
131 key
.ek_fsidtype
= fsidtype
;
132 memcpy(key
.ek_fsid
, buf
, len
);
134 ek
= svc_expkey_lookup(cd
, &key
);
139 /* now we want a pathname, or empty meaning NEGATIVE */
141 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
144 dprintk("Path seems to be <%s>\n", buf
);
147 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
148 ek
= svc_expkey_update(cd
, &key
, ek
);
150 trace_nfsd_expkey_update(ek
, NULL
);
154 err
= kern_path(buf
, 0, &key
.ek_path
);
158 dprintk("Found the path %s\n", buf
);
160 ek
= svc_expkey_update(cd
, &key
, ek
);
162 trace_nfsd_expkey_update(ek
, buf
);
165 path_put(&key
.ek_path
);
170 cache_put(&ek
->h
, cd
);
172 auth_domain_put(dom
);
177 static int expkey_show(struct seq_file
*m
,
178 struct cache_detail
*cd
,
179 struct cache_head
*h
)
181 struct svc_expkey
*ek
;
185 seq_puts(m
, "#domain fsidtype fsid [path]\n");
188 ek
= container_of(h
, struct svc_expkey
, h
);
189 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
191 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
192 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
193 if (test_bit(CACHE_VALID
, &h
->flags
) &&
194 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
196 seq_path(m
, &ek
->ek_path
, "\\ \t\n");
202 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
204 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
205 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
207 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
208 orig
->ek_client
!= new->ek_client
||
209 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
214 static inline void expkey_init(struct cache_head
*cnew
,
215 struct cache_head
*citem
)
217 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
218 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
220 kref_get(&item
->ek_client
->ref
);
221 new->ek_client
= item
->ek_client
;
222 new->ek_fsidtype
= item
->ek_fsidtype
;
224 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
227 static inline void expkey_update(struct cache_head
*cnew
,
228 struct cache_head
*citem
)
230 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
231 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
233 new->ek_path
= item
->ek_path
;
234 path_get(&item
->ek_path
);
237 static struct cache_head
*expkey_alloc(void)
239 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
246 static void expkey_flush(void)
249 * Take the nfsd_mutex here to ensure that the file cache is not
250 * destroyed while we're in the middle of flushing.
252 mutex_lock(&nfsd_mutex
);
253 nfsd_file_cache_purge(current
->nsproxy
->net_ns
);
254 mutex_unlock(&nfsd_mutex
);
257 static const struct cache_detail svc_expkey_cache_template
= {
258 .owner
= THIS_MODULE
,
259 .hash_size
= EXPKEY_HASHMAX
,
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
,
268 .update
= expkey_update
,
269 .alloc
= expkey_alloc
,
270 .flush
= expkey_flush
,
274 svc_expkey_hash(struct svc_expkey
*item
)
276 int hash
= item
->ek_fsidtype
;
277 char * cp
= (char*)item
->ek_fsid
;
278 int len
= key_len(item
->ek_fsidtype
);
280 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
281 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
282 hash
&= EXPKEY_HASHMASK
;
286 static struct svc_expkey
*
287 svc_expkey_lookup(struct cache_detail
*cd
, struct svc_expkey
*item
)
289 struct cache_head
*ch
;
290 int hash
= svc_expkey_hash(item
);
292 ch
= sunrpc_cache_lookup_rcu(cd
, &item
->h
, hash
);
294 return container_of(ch
, struct svc_expkey
, h
);
299 static struct svc_expkey
*
300 svc_expkey_update(struct cache_detail
*cd
, struct svc_expkey
*new,
301 struct svc_expkey
*old
)
303 struct cache_head
*ch
;
304 int hash
= svc_expkey_hash(new);
306 ch
= sunrpc_cache_update(cd
, &new->h
, &old
->h
, hash
);
308 return container_of(ch
, struct svc_expkey
, h
);
314 #define EXPORT_HASHBITS 8
315 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
317 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
319 struct nfsd4_fs_location
*locations
= fsloc
->locations
;
325 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
326 kfree(locations
[i
].path
);
327 kfree(locations
[i
].hosts
);
331 fsloc
->locations
= NULL
;
334 static int export_stats_init(struct export_stats
*stats
)
336 stats
->start_time
= ktime_get_seconds();
337 return nfsd_percpu_counters_init(stats
->counter
, EXP_STATS_COUNTERS_NUM
);
340 static void export_stats_reset(struct export_stats
*stats
)
342 nfsd_percpu_counters_reset(stats
->counter
, EXP_STATS_COUNTERS_NUM
);
345 static void export_stats_destroy(struct export_stats
*stats
)
347 nfsd_percpu_counters_destroy(stats
->counter
, EXP_STATS_COUNTERS_NUM
);
350 static void svc_export_put(struct kref
*ref
)
352 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
353 path_put(&exp
->ex_path
);
354 auth_domain_put(exp
->ex_client
);
355 nfsd4_fslocs_free(&exp
->ex_fslocs
);
356 export_stats_destroy(&exp
->ex_stats
);
358 kfree_rcu(exp
, ex_rcu
);
361 static int svc_export_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
363 return sunrpc_cache_pipe_upcall(cd
, h
);
366 static void svc_export_request(struct cache_detail
*cd
,
367 struct cache_head
*h
,
368 char **bpp
, int *blen
)
371 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
374 qword_add(bpp
, blen
, exp
->ex_client
->name
);
375 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
377 /* is this correct? */
381 qword_add(bpp
, blen
, pth
);
385 static struct svc_export
*svc_export_update(struct svc_export
*new,
386 struct svc_export
*old
);
387 static struct svc_export
*svc_export_lookup(struct svc_export
*);
389 static int check_export(struct path
*path
, int *flags
, unsigned char *uuid
)
391 struct inode
*inode
= d_inode(path
->dentry
);
394 * We currently export only dirs, regular files, and (for v4
395 * pseudoroot) symlinks.
397 if (!S_ISDIR(inode
->i_mode
) &&
398 !S_ISLNK(inode
->i_mode
) &&
399 !S_ISREG(inode
->i_mode
))
403 * Mountd should never pass down a writeable V4ROOT export, but,
406 if (*flags
& NFSEXP_V4ROOT
)
407 *flags
|= NFSEXP_READONLY
;
409 /* There are two requirements on a filesystem to be exportable.
410 * 1: We must be able to identify the filesystem from a number.
411 * either a device number (so FS_REQUIRES_DEV needed)
412 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
413 * 2: We must be able to find an inode from a filehandle.
414 * This means that s_export_op must be set.
415 * 3: We must not currently be on an idmapped mount.
417 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
418 !(*flags
& NFSEXP_FSID
) &&
420 dprintk("exp_export: export of non-dev fs without fsid\n");
424 if (!inode
->i_sb
->s_export_op
||
425 !inode
->i_sb
->s_export_op
->fh_to_dentry
) {
426 dprintk("exp_export: export of invalid fs type.\n");
430 if (is_idmapped_mnt(path
->mnt
)) {
431 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
435 if (inode
->i_sb
->s_export_op
->flags
& EXPORT_OP_NOSUBTREECHK
&&
436 !(*flags
& NFSEXP_NOSUBTREECHECK
)) {
437 dprintk("%s: %s does not support subtree checking!\n",
438 __func__
, inode
->i_sb
->s_type
->name
);
444 #ifdef CONFIG_NFSD_V4
447 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
450 int migrated
, i
, err
;
452 /* more than one fsloc */
453 if (fsloc
->locations
)
457 err
= get_uint(mesg
, &fsloc
->locations_count
);
460 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
462 if (fsloc
->locations_count
== 0)
465 fsloc
->locations
= kcalloc(fsloc
->locations_count
,
466 sizeof(struct nfsd4_fs_location
),
468 if (!fsloc
->locations
)
470 for (i
=0; i
< fsloc
->locations_count
; i
++) {
471 /* colon separated host list */
473 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
477 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
478 if (!fsloc
->locations
[i
].hosts
)
481 /* slash separated path component list */
482 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
486 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
487 if (!fsloc
->locations
[i
].path
)
491 err
= get_int(mesg
, &migrated
);
495 if (migrated
< 0 || migrated
> 1)
497 fsloc
->migrated
= migrated
;
500 nfsd4_fslocs_free(fsloc
);
504 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
506 struct exp_flavor_info
*f
;
510 /* more than one secinfo */
511 if (exp
->ex_nflavors
)
514 err
= get_uint(mesg
, &listsize
);
517 if (listsize
> MAX_SECINFO_LIST
)
520 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
521 err
= get_uint(mesg
, &f
->pseudoflavor
);
525 * XXX: It would be nice to also check whether this
526 * pseudoflavor is supported, so we can discover the
527 * problem at export time instead of when a client fails
530 err
= get_uint(mesg
, &f
->flags
);
533 /* Only some flags are allowed to differ between flavors: */
534 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
537 exp
->ex_nflavors
= listsize
;
541 #else /* CONFIG_NFSD_V4 */
543 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
545 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
548 static int xprtsec_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
550 unsigned int i
, mode
, listsize
;
553 err
= get_uint(mesg
, &listsize
);
556 if (listsize
> NFSEXP_XPRTSEC_NUM
)
559 exp
->ex_xprtsec_modes
= 0;
560 for (i
= 0; i
< listsize
; i
++) {
561 err
= get_uint(mesg
, &mode
);
564 if (mode
> NFSEXP_XPRTSEC_MTLS
)
566 exp
->ex_xprtsec_modes
|= mode
;
572 nfsd_uuid_parse(char **mesg
, char *buf
, unsigned char **puuid
)
576 /* more than one uuid */
580 /* expect a 16 byte uuid encoded as \xXXXX... */
581 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
582 if (len
!= EX_UUID_LEN
)
585 *puuid
= kmemdup(buf
, EX_UUID_LEN
, GFP_KERNEL
);
592 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
594 /* client path expiry [flags anonuid anongid fsid] */
597 struct auth_domain
*dom
= NULL
;
598 struct svc_export exp
= {}, *expp
;
601 if (mesg
[mlen
-1] != '\n')
605 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
611 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
615 dom
= auth_domain_find(buf
);
621 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
624 err
= kern_path(buf
, 0, &exp
.ex_path
);
630 exp
.ex_devid_map
= NULL
;
631 exp
.ex_xprtsec_modes
= NFSEXP_XPRTSEC_ALL
;
634 err
= get_expiry(&mesg
, &exp
.h
.expiry_time
);
639 err
= get_int(&mesg
, &an_int
);
640 if (err
== -ENOENT
) {
642 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
644 if (err
|| an_int
< 0)
646 exp
.ex_flags
= an_int
;
649 err
= get_int(&mesg
, &an_int
);
652 exp
.ex_anon_uid
= make_kuid(current_user_ns(), an_int
);
655 err
= get_int(&mesg
, &an_int
);
658 exp
.ex_anon_gid
= make_kgid(current_user_ns(), an_int
);
661 err
= get_int(&mesg
, &an_int
);
664 exp
.ex_fsid
= an_int
;
666 while (qword_get(&mesg
, buf
, PAGE_SIZE
) > 0) {
667 if (strcmp(buf
, "fsloc") == 0)
668 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
669 else if (strcmp(buf
, "uuid") == 0)
670 err
= nfsd_uuid_parse(&mesg
, buf
, &exp
.ex_uuid
);
671 else if (strcmp(buf
, "secinfo") == 0)
672 err
= secinfo_parse(&mesg
, buf
, &exp
);
673 else if (strcmp(buf
, "xprtsec") == 0)
674 err
= xprtsec_parse(&mesg
, buf
, &exp
);
676 /* quietly ignore unknown words and anything
677 * following. Newer user-space can try to set
678 * new values, then see what the result was.
685 err
= check_export(&exp
.ex_path
, &exp
.ex_flags
, exp
.ex_uuid
);
690 * No point caching this if it would immediately expire.
691 * Also, this protects exportfs's dummy export from the
692 * anon_uid/anon_gid checks:
694 if (exp
.h
.expiry_time
< seconds_since_boot())
697 * For some reason exportfs has been passing down an
698 * invalid (-1) uid & gid on the "dummy" export which it
699 * uses to test export support. To make sure exportfs
700 * sees errors from check_export we therefore need to
701 * delay these checks till after check_export:
704 if (!uid_valid(exp
.ex_anon_uid
))
706 if (!gid_valid(exp
.ex_anon_gid
))
710 nfsd4_setup_layout_type(&exp
);
713 expp
= svc_export_lookup(&exp
);
718 expp
= svc_export_update(&exp
, expp
);
720 trace_nfsd_export_update(expp
);
726 nfsd4_fslocs_free(&exp
.ex_fslocs
);
729 path_put(&exp
.ex_path
);
731 auth_domain_put(dom
);
737 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
738 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fslocs
);
739 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
741 static int is_export_stats_file(struct seq_file
*m
)
744 * The export_stats file uses the same ops as the exports file.
745 * We use the file's name to determine the reported info per export.
746 * There is no rename in nsfdfs, so d_name.name is stable.
748 return !strcmp(m
->file
->f_path
.dentry
->d_name
.name
, "export_stats");
751 static int svc_export_show(struct seq_file
*m
,
752 struct cache_detail
*cd
,
753 struct cache_head
*h
)
755 struct svc_export
*exp
;
756 bool export_stats
= is_export_stats_file(m
);
760 seq_puts(m
, "#path domain start-time\n#\tstats\n");
762 seq_puts(m
, "#path domain(flags)\n");
765 exp
= container_of(h
, struct svc_export
, h
);
766 seq_path(m
, &exp
->ex_path
, " \t\n\\");
768 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
770 seq_printf(m
, "\t%lld\n", exp
->ex_stats
.start_time
);
771 seq_printf(m
, "\tfh_stale: %lld\n",
772 percpu_counter_sum_positive(&exp
->ex_stats
.counter
[EXP_STATS_FH_STALE
]));
773 seq_printf(m
, "\tio_read: %lld\n",
774 percpu_counter_sum_positive(&exp
->ex_stats
.counter
[EXP_STATS_IO_READ
]));
775 seq_printf(m
, "\tio_write: %lld\n",
776 percpu_counter_sum_positive(&exp
->ex_stats
.counter
[EXP_STATS_IO_WRITE
]));
781 if (test_bit(CACHE_VALID
, &h
->flags
) &&
782 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
783 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
784 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
787 seq_puts(m
, ",uuid=");
788 for (i
= 0; i
< EX_UUID_LEN
; i
++) {
791 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
794 show_secinfo(m
, exp
);
799 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
801 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
802 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
803 return orig
->ex_client
== new->ex_client
&&
804 path_equal(&orig
->ex_path
, &new->ex_path
);
807 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
809 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
810 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
812 kref_get(&item
->ex_client
->ref
);
813 new->ex_client
= item
->ex_client
;
814 new->ex_path
= item
->ex_path
;
815 path_get(&item
->ex_path
);
816 new->ex_fslocs
.locations
= NULL
;
817 new->ex_fslocs
.locations_count
= 0;
818 new->ex_fslocs
.migrated
= 0;
819 new->ex_layout_types
= 0;
822 export_stats_reset(&new->ex_stats
);
825 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
827 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
828 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
831 new->ex_flags
= item
->ex_flags
;
832 new->ex_anon_uid
= item
->ex_anon_uid
;
833 new->ex_anon_gid
= item
->ex_anon_gid
;
834 new->ex_fsid
= item
->ex_fsid
;
835 new->ex_devid_map
= item
->ex_devid_map
;
836 item
->ex_devid_map
= NULL
;
837 new->ex_uuid
= item
->ex_uuid
;
838 item
->ex_uuid
= NULL
;
839 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
840 item
->ex_fslocs
.locations
= NULL
;
841 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
842 item
->ex_fslocs
.locations_count
= 0;
843 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
844 item
->ex_fslocs
.migrated
= 0;
845 new->ex_layout_types
= item
->ex_layout_types
;
846 new->ex_nflavors
= item
->ex_nflavors
;
847 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
848 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
850 new->ex_xprtsec_modes
= item
->ex_xprtsec_modes
;
853 static struct cache_head
*svc_export_alloc(void)
855 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
859 if (export_stats_init(&i
->ex_stats
)) {
867 static const struct cache_detail svc_export_cache_template
= {
868 .owner
= THIS_MODULE
,
869 .hash_size
= EXPORT_HASHMAX
,
870 .name
= "nfsd.export",
871 .cache_put
= svc_export_put
,
872 .cache_upcall
= svc_export_upcall
,
873 .cache_request
= svc_export_request
,
874 .cache_parse
= svc_export_parse
,
875 .cache_show
= svc_export_show
,
876 .match
= svc_export_match
,
877 .init
= svc_export_init
,
878 .update
= export_update
,
879 .alloc
= svc_export_alloc
,
883 svc_export_hash(struct svc_export
*exp
)
887 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
888 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
889 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
893 static struct svc_export
*
894 svc_export_lookup(struct svc_export
*exp
)
896 struct cache_head
*ch
;
897 int hash
= svc_export_hash(exp
);
899 ch
= sunrpc_cache_lookup_rcu(exp
->cd
, &exp
->h
, hash
);
901 return container_of(ch
, struct svc_export
, h
);
906 static struct svc_export
*
907 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
909 struct cache_head
*ch
;
910 int hash
= svc_export_hash(old
);
912 ch
= sunrpc_cache_update(old
->cd
, &new->h
, &old
->h
, hash
);
914 return container_of(ch
, struct svc_export
, h
);
920 static struct svc_expkey
*
921 exp_find_key(struct cache_detail
*cd
, struct auth_domain
*clp
, int fsid_type
,
922 u32
*fsidv
, struct cache_req
*reqp
)
924 struct svc_expkey key
, *ek
;
928 return ERR_PTR(-ENOENT
);
931 key
.ek_fsidtype
= fsid_type
;
932 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
934 ek
= svc_expkey_lookup(cd
, &key
);
936 return ERR_PTR(-ENOMEM
);
937 err
= cache_check(cd
, &ek
->h
, reqp
);
939 trace_nfsd_exp_find_key(&key
, err
);
945 static struct svc_export
*
946 exp_get_by_name(struct cache_detail
*cd
, struct auth_domain
*clp
,
947 const struct path
*path
, struct cache_req
*reqp
)
949 struct svc_export
*exp
, key
;
953 return ERR_PTR(-ENOENT
);
959 exp
= svc_export_lookup(&key
);
961 return ERR_PTR(-ENOMEM
);
962 err
= cache_check(cd
, &exp
->h
, reqp
);
964 trace_nfsd_exp_get_by_name(&key
, err
);
971 * Find the export entry for a given dentry.
973 static struct svc_export
*
974 exp_parent(struct cache_detail
*cd
, struct auth_domain
*clp
, struct path
*path
)
976 struct dentry
*saved
= dget(path
->dentry
);
977 struct svc_export
*exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
979 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
980 struct dentry
*parent
= dget_parent(path
->dentry
);
982 path
->dentry
= parent
;
983 exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
986 path
->dentry
= saved
;
993 * Obtain the root fh on behalf of a client.
994 * This could be done in user space, but I feel that it adds some safety
995 * since its harder to fool a kernel module than a user space program.
998 exp_rootfh(struct net
*net
, struct auth_domain
*clp
, char *name
,
999 struct knfsd_fh
*f
, int maxsize
)
1001 struct svc_export
*exp
;
1003 struct inode
*inode
;
1006 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1007 struct cache_detail
*cd
= nn
->svc_export_cache
;
1010 /* NB: we probably ought to check that it's NUL-terminated */
1011 if (kern_path(name
, 0, &path
)) {
1012 printk("nfsd: exp_rootfh path not found %s", name
);
1015 inode
= d_inode(path
.dentry
);
1017 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1018 name
, path
.dentry
, clp
->name
,
1019 inode
->i_sb
->s_id
, inode
->i_ino
);
1020 exp
= exp_parent(cd
, clp
, &path
);
1027 * fh must be initialized before calling fh_compose
1029 fh_init(&fh
, maxsize
);
1030 if (fh_compose(&fh
, exp
, path
.dentry
, NULL
))
1034 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1042 static struct svc_export
*exp_find(struct cache_detail
*cd
,
1043 struct auth_domain
*clp
, int fsid_type
,
1044 u32
*fsidv
, struct cache_req
*reqp
)
1046 struct svc_export
*exp
;
1047 struct nfsd_net
*nn
= net_generic(cd
->net
, nfsd_net_id
);
1048 struct svc_expkey
*ek
= exp_find_key(nn
->svc_expkey_cache
, clp
, fsid_type
, fsidv
, reqp
);
1050 return ERR_CAST(ek
);
1052 exp
= exp_get_by_name(cd
, clp
, &ek
->ek_path
, reqp
);
1053 cache_put(&ek
->h
, nn
->svc_expkey_cache
);
1056 return ERR_CAST(exp
);
1060 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
1062 struct exp_flavor_info
*f
, *end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1063 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
1065 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_NONE
) {
1066 if (!test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
))
1069 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_TLS
) {
1070 if (test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
) &&
1071 !test_bit(XPT_PEER_AUTH
, &xprt
->xpt_flags
))
1074 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_MTLS
) {
1075 if (test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
) &&
1076 test_bit(XPT_PEER_AUTH
, &xprt
->xpt_flags
))
1082 /* legacy gss-only clients are always OK: */
1083 if (exp
->ex_client
== rqstp
->rq_gssclient
)
1085 /* ip-address based client; check sec= export option: */
1086 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1087 if (f
->pseudoflavor
== rqstp
->rq_cred
.cr_flavor
)
1090 /* defaults in absence of sec= options: */
1091 if (exp
->ex_nflavors
== 0) {
1092 if (rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_NULL
||
1093 rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_UNIX
)
1097 /* If the compound op contains a spo_must_allowed op,
1098 * it will be sent with integrity/protection which
1099 * will have to be expressly allowed on mounts that
1103 if (nfsd4_spo_must_allow(rqstp
))
1107 return rqstp
->rq_vers
< 4 ? nfserr_acces
: nfserr_wrongsec
;
1111 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1112 * auth_unix client) if it's available and has secinfo information;
1113 * otherwise, will try to use rq_gssclient.
1115 * Called from functions that handle requests; functions that do work on
1116 * behalf of mountd are passed a single client name to use, and should
1117 * use exp_get_by_name() or exp_find().
1120 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct path
*path
)
1122 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1123 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1124 struct cache_detail
*cd
= nn
->svc_export_cache
;
1126 if (rqstp
->rq_client
== NULL
)
1129 /* First try the auth_unix client: */
1130 exp
= exp_get_by_name(cd
, rqstp
->rq_client
, path
, &rqstp
->rq_chandle
);
1131 if (PTR_ERR(exp
) == -ENOENT
)
1135 /* If it has secinfo, assume there are no gss/... clients */
1136 if (exp
->ex_nflavors
> 0)
1139 /* Otherwise, try falling back on gss client */
1140 if (rqstp
->rq_gssclient
== NULL
)
1142 gssexp
= exp_get_by_name(cd
, rqstp
->rq_gssclient
, path
, &rqstp
->rq_chandle
);
1143 if (PTR_ERR(gssexp
) == -ENOENT
)
1151 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1153 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1154 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1155 struct cache_detail
*cd
= nn
->svc_export_cache
;
1157 if (rqstp
->rq_client
== NULL
)
1160 /* First try the auth_unix client: */
1161 exp
= exp_find(cd
, rqstp
->rq_client
, fsid_type
,
1162 fsidv
, &rqstp
->rq_chandle
);
1163 if (PTR_ERR(exp
) == -ENOENT
)
1167 /* If it has secinfo, assume there are no gss/... clients */
1168 if (exp
->ex_nflavors
> 0)
1171 /* Otherwise, try falling back on gss client */
1172 if (rqstp
->rq_gssclient
== NULL
)
1174 gssexp
= exp_find(cd
, rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1175 &rqstp
->rq_chandle
);
1176 if (PTR_ERR(gssexp
) == -ENOENT
)
1184 rqst_exp_parent(struct svc_rqst
*rqstp
, struct path
*path
)
1186 struct dentry
*saved
= dget(path
->dentry
);
1187 struct svc_export
*exp
= rqst_exp_get_by_name(rqstp
, path
);
1189 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
1190 struct dentry
*parent
= dget_parent(path
->dentry
);
1192 path
->dentry
= parent
;
1193 exp
= rqst_exp_get_by_name(rqstp
, path
);
1196 path
->dentry
= saved
;
1200 struct svc_export
*rqst_find_fsidzero_export(struct svc_rqst
*rqstp
)
1204 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1206 return rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1210 * Called when we need the filehandle for the root of the pseudofs,
1211 * for a given NFSv4 client. The root is defined to be the
1212 * export point with fsid==0
1215 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1217 struct svc_export
*exp
;
1220 exp
= rqst_find_fsidzero_export(rqstp
);
1222 return nfserrno(PTR_ERR(exp
));
1223 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1228 static struct flags
{
1232 { NFSEXP_READONLY
, {"ro", "rw"}},
1233 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1234 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1235 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1236 { NFSEXP_ASYNC
, {"async", "sync"}},
1237 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1238 { NFSEXP_NOREADDIRPLUS
, {"nordirplus", ""}},
1239 { NFSEXP_NOHIDE
, {"nohide", ""}},
1240 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1241 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1242 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1243 { NFSEXP_V4ROOT
, {"v4root", ""}},
1244 { NFSEXP_PNFS
, {"pnfs", ""}},
1245 { NFSEXP_SECURITY_LABEL
, {"security_label", ""}},
1249 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1252 int state
, first
= 0;
1254 for (flg
= expflags
; flg
->flag
; flg
++) {
1255 if (flg
->flag
& ~mask
)
1257 state
= (flg
->flag
& flags
) ? 0 : 1;
1258 if (*flg
->name
[state
])
1259 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1263 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1266 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1269 static bool secinfo_flags_equal(int f
, int g
)
1271 f
&= NFSEXP_SECINFO_FLAGS
;
1272 g
&= NFSEXP_SECINFO_FLAGS
;
1276 static int show_secinfo_run(struct seq_file
*m
, struct exp_flavor_info
**fp
, struct exp_flavor_info
*end
)
1280 flags
= (*fp
)->flags
;
1281 seq_printf(m
, ",sec=%d", (*fp
)->pseudoflavor
);
1283 while (*fp
!= end
&& secinfo_flags_equal(flags
, (*fp
)->flags
)) {
1284 seq_printf(m
, ":%d", (*fp
)->pseudoflavor
);
1290 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1292 struct exp_flavor_info
*f
;
1293 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1296 if (exp
->ex_nflavors
== 0)
1298 f
= exp
->ex_flavors
;
1299 flags
= show_secinfo_run(m
, &f
, end
);
1300 if (!secinfo_flags_equal(flags
, exp
->ex_flags
))
1301 show_secinfo_flags(m
, flags
);
1303 flags
= show_secinfo_run(m
, &f
, end
);
1304 show_secinfo_flags(m
, flags
);
1308 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1309 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1311 struct user_namespace
*userns
= m
->file
->f_cred
->user_ns
;
1313 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1314 if (flag
& NFSEXP_FSID
)
1315 seq_printf(m
, ",fsid=%d", fsid
);
1316 if (!uid_eq(anonu
, make_kuid(userns
, (uid_t
)-2)) &&
1317 !uid_eq(anonu
, make_kuid(userns
, 0x10000-2)))
1318 seq_printf(m
, ",anonuid=%u", from_kuid_munged(userns
, anonu
));
1319 if (!gid_eq(anong
, make_kgid(userns
, (gid_t
)-2)) &&
1320 !gid_eq(anong
, make_kgid(userns
, 0x10000-2)))
1321 seq_printf(m
, ",anongid=%u", from_kgid_munged(userns
, anong
));
1322 if (fsloc
&& fsloc
->locations_count
> 0) {
1323 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1326 seq_printf(m
, ",%s=", loctype
);
1327 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1329 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1330 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1332 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1334 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1339 static int e_show(struct seq_file
*m
, void *p
)
1341 struct cache_head
*cp
= p
;
1342 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1343 struct cache_detail
*cd
= m
->private;
1344 bool export_stats
= is_export_stats_file(m
);
1346 if (p
== SEQ_START_TOKEN
) {
1347 seq_puts(m
, "# Version 1.1\n");
1349 seq_puts(m
, "# Path Client Start-time\n#\tStats\n");
1351 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1356 if (cache_check(cd
, &exp
->h
, NULL
))
1359 return svc_export_show(m
, cd
, cp
);
1362 const struct seq_operations nfs_exports_op
= {
1363 .start
= cache_seq_start_rcu
,
1364 .next
= cache_seq_next_rcu
,
1365 .stop
= cache_seq_stop_rcu
,
1370 * Initialize the exports module.
1373 nfsd_export_init(struct net
*net
)
1376 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1378 dprintk("nfsd: initializing export module (net: %x).\n", net
->ns
.inum
);
1380 nn
->svc_export_cache
= cache_create_net(&svc_export_cache_template
, net
);
1381 if (IS_ERR(nn
->svc_export_cache
))
1382 return PTR_ERR(nn
->svc_export_cache
);
1383 rv
= cache_register_net(nn
->svc_export_cache
, net
);
1385 goto destroy_export_cache
;
1387 nn
->svc_expkey_cache
= cache_create_net(&svc_expkey_cache_template
, net
);
1388 if (IS_ERR(nn
->svc_expkey_cache
)) {
1389 rv
= PTR_ERR(nn
->svc_expkey_cache
);
1390 goto unregister_export_cache
;
1392 rv
= cache_register_net(nn
->svc_expkey_cache
, net
);
1394 goto destroy_expkey_cache
;
1397 destroy_expkey_cache
:
1398 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1399 unregister_export_cache
:
1400 cache_unregister_net(nn
->svc_export_cache
, net
);
1401 destroy_export_cache
:
1402 cache_destroy_net(nn
->svc_export_cache
, net
);
1407 * Flush exports table - called when last nfsd thread is killed
1410 nfsd_export_flush(struct net
*net
)
1412 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1414 cache_purge(nn
->svc_expkey_cache
);
1415 cache_purge(nn
->svc_export_cache
);
1419 * Shutdown the exports module.
1422 nfsd_export_shutdown(struct net
*net
)
1424 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1426 dprintk("nfsd: shutting down export module (net: %x).\n", net
->ns
.inum
);
1428 cache_unregister_net(nn
->svc_expkey_cache
, net
);
1429 cache_unregister_net(nn
->svc_export_cache
, net
);
1430 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1431 cache_destroy_net(nn
->svc_export_cache
, net
);
1432 svcauth_unix_purge(net
);
1434 dprintk("nfsd: export shutdown complete (net: %x).\n", net
->ns
.inum
);