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
)
343 nfsd_percpu_counters_reset(stats
->counter
,
344 EXP_STATS_COUNTERS_NUM
);
347 static void export_stats_destroy(struct export_stats
*stats
)
350 nfsd_percpu_counters_destroy(stats
->counter
,
351 EXP_STATS_COUNTERS_NUM
);
354 static void svc_export_put(struct kref
*ref
)
356 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
357 path_put(&exp
->ex_path
);
358 auth_domain_put(exp
->ex_client
);
359 nfsd4_fslocs_free(&exp
->ex_fslocs
);
360 export_stats_destroy(exp
->ex_stats
);
361 kfree(exp
->ex_stats
);
363 kfree_rcu(exp
, ex_rcu
);
366 static int svc_export_upcall(struct cache_detail
*cd
, struct cache_head
*h
)
368 return sunrpc_cache_pipe_upcall(cd
, h
);
371 static void svc_export_request(struct cache_detail
*cd
,
372 struct cache_head
*h
,
373 char **bpp
, int *blen
)
376 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
379 qword_add(bpp
, blen
, exp
->ex_client
->name
);
380 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
382 /* is this correct? */
386 qword_add(bpp
, blen
, pth
);
390 static struct svc_export
*svc_export_update(struct svc_export
*new,
391 struct svc_export
*old
);
392 static struct svc_export
*svc_export_lookup(struct svc_export
*);
394 static int check_export(struct path
*path
, int *flags
, unsigned char *uuid
)
396 struct inode
*inode
= d_inode(path
->dentry
);
399 * We currently export only dirs, regular files, and (for v4
400 * pseudoroot) symlinks.
402 if (!S_ISDIR(inode
->i_mode
) &&
403 !S_ISLNK(inode
->i_mode
) &&
404 !S_ISREG(inode
->i_mode
))
408 * Mountd should never pass down a writeable V4ROOT export, but,
411 if (*flags
& NFSEXP_V4ROOT
)
412 *flags
|= NFSEXP_READONLY
;
414 /* There are two requirements on a filesystem to be exportable.
415 * 1: We must be able to identify the filesystem from a number.
416 * either a device number (so FS_REQUIRES_DEV needed)
417 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
418 * 2: We must be able to find an inode from a filehandle.
419 * This means that s_export_op must be set.
420 * 3: We must not currently be on an idmapped mount.
422 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
423 !(*flags
& NFSEXP_FSID
) &&
425 dprintk("exp_export: export of non-dev fs without fsid\n");
429 if (!exportfs_can_decode_fh(inode
->i_sb
->s_export_op
)) {
430 dprintk("exp_export: export of invalid fs type.\n");
434 if (is_idmapped_mnt(path
->mnt
)) {
435 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
439 if (inode
->i_sb
->s_export_op
->flags
& EXPORT_OP_NOSUBTREECHK
&&
440 !(*flags
& NFSEXP_NOSUBTREECHECK
)) {
441 dprintk("%s: %s does not support subtree checking!\n",
442 __func__
, inode
->i_sb
->s_type
->name
);
448 #ifdef CONFIG_NFSD_V4
451 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
454 int migrated
, i
, err
;
456 /* more than one fsloc */
457 if (fsloc
->locations
)
461 err
= get_uint(mesg
, &fsloc
->locations_count
);
464 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
466 if (fsloc
->locations_count
== 0)
469 fsloc
->locations
= kcalloc(fsloc
->locations_count
,
470 sizeof(struct nfsd4_fs_location
),
472 if (!fsloc
->locations
)
474 for (i
=0; i
< fsloc
->locations_count
; i
++) {
475 /* colon separated host list */
477 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
481 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
482 if (!fsloc
->locations
[i
].hosts
)
485 /* slash separated path component list */
486 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
490 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
491 if (!fsloc
->locations
[i
].path
)
495 err
= get_int(mesg
, &migrated
);
499 if (migrated
< 0 || migrated
> 1)
501 fsloc
->migrated
= migrated
;
504 nfsd4_fslocs_free(fsloc
);
508 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
510 struct exp_flavor_info
*f
;
514 /* more than one secinfo */
515 if (exp
->ex_nflavors
)
518 err
= get_uint(mesg
, &listsize
);
521 if (listsize
> MAX_SECINFO_LIST
)
524 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
525 err
= get_uint(mesg
, &f
->pseudoflavor
);
529 * XXX: It would be nice to also check whether this
530 * pseudoflavor is supported, so we can discover the
531 * problem at export time instead of when a client fails
534 err
= get_uint(mesg
, &f
->flags
);
537 /* Only some flags are allowed to differ between flavors: */
538 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
541 exp
->ex_nflavors
= listsize
;
545 #else /* CONFIG_NFSD_V4 */
547 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
549 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
552 static int xprtsec_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
554 unsigned int i
, mode
, listsize
;
557 err
= get_uint(mesg
, &listsize
);
560 if (listsize
> NFSEXP_XPRTSEC_NUM
)
563 exp
->ex_xprtsec_modes
= 0;
564 for (i
= 0; i
< listsize
; i
++) {
565 err
= get_uint(mesg
, &mode
);
568 if (mode
> NFSEXP_XPRTSEC_MTLS
)
570 exp
->ex_xprtsec_modes
|= mode
;
576 nfsd_uuid_parse(char **mesg
, char *buf
, unsigned char **puuid
)
580 /* more than one uuid */
584 /* expect a 16 byte uuid encoded as \xXXXX... */
585 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
586 if (len
!= EX_UUID_LEN
)
589 *puuid
= kmemdup(buf
, EX_UUID_LEN
, GFP_KERNEL
);
596 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
598 /* client path expiry [flags anonuid anongid fsid] */
601 struct auth_domain
*dom
= NULL
;
602 struct svc_export exp
= {}, *expp
;
605 if (mesg
[mlen
-1] != '\n')
609 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
615 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
619 dom
= auth_domain_find(buf
);
625 if (qword_get(&mesg
, buf
, PAGE_SIZE
) <= 0)
628 err
= kern_path(buf
, 0, &exp
.ex_path
);
634 exp
.ex_devid_map
= NULL
;
635 exp
.ex_xprtsec_modes
= NFSEXP_XPRTSEC_ALL
;
638 err
= get_expiry(&mesg
, &exp
.h
.expiry_time
);
643 err
= get_int(&mesg
, &an_int
);
644 if (err
== -ENOENT
) {
646 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
648 if (err
|| an_int
< 0)
650 exp
.ex_flags
= an_int
;
653 err
= get_int(&mesg
, &an_int
);
656 exp
.ex_anon_uid
= make_kuid(current_user_ns(), an_int
);
659 err
= get_int(&mesg
, &an_int
);
662 exp
.ex_anon_gid
= make_kgid(current_user_ns(), an_int
);
665 err
= get_int(&mesg
, &an_int
);
668 exp
.ex_fsid
= an_int
;
670 while (qword_get(&mesg
, buf
, PAGE_SIZE
) > 0) {
671 if (strcmp(buf
, "fsloc") == 0)
672 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
673 else if (strcmp(buf
, "uuid") == 0)
674 err
= nfsd_uuid_parse(&mesg
, buf
, &exp
.ex_uuid
);
675 else if (strcmp(buf
, "secinfo") == 0)
676 err
= secinfo_parse(&mesg
, buf
, &exp
);
677 else if (strcmp(buf
, "xprtsec") == 0)
678 err
= xprtsec_parse(&mesg
, buf
, &exp
);
680 /* quietly ignore unknown words and anything
681 * following. Newer user-space can try to set
682 * new values, then see what the result was.
689 err
= check_export(&exp
.ex_path
, &exp
.ex_flags
, exp
.ex_uuid
);
694 * No point caching this if it would immediately expire.
695 * Also, this protects exportfs's dummy export from the
696 * anon_uid/anon_gid checks:
698 if (exp
.h
.expiry_time
< seconds_since_boot())
701 * For some reason exportfs has been passing down an
702 * invalid (-1) uid & gid on the "dummy" export which it
703 * uses to test export support. To make sure exportfs
704 * sees errors from check_export we therefore need to
705 * delay these checks till after check_export:
708 if (!uid_valid(exp
.ex_anon_uid
))
710 if (!gid_valid(exp
.ex_anon_gid
))
714 nfsd4_setup_layout_type(&exp
);
717 expp
= svc_export_lookup(&exp
);
722 expp
= svc_export_update(&exp
, expp
);
724 trace_nfsd_export_update(expp
);
730 nfsd4_fslocs_free(&exp
.ex_fslocs
);
733 path_put(&exp
.ex_path
);
735 auth_domain_put(dom
);
741 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
742 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fslocs
);
743 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
745 static int is_export_stats_file(struct seq_file
*m
)
748 * The export_stats file uses the same ops as the exports file.
749 * We use the file's name to determine the reported info per export.
750 * There is no rename in nsfdfs, so d_name.name is stable.
752 return !strcmp(m
->file
->f_path
.dentry
->d_name
.name
, "export_stats");
755 static int svc_export_show(struct seq_file
*m
,
756 struct cache_detail
*cd
,
757 struct cache_head
*h
)
759 struct svc_export
*exp
;
760 bool export_stats
= is_export_stats_file(m
);
764 seq_puts(m
, "#path domain start-time\n#\tstats\n");
766 seq_puts(m
, "#path domain(flags)\n");
769 exp
= container_of(h
, struct svc_export
, h
);
770 seq_path(m
, &exp
->ex_path
, " \t\n\\");
772 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
774 struct percpu_counter
*counter
= exp
->ex_stats
->counter
;
776 seq_printf(m
, "\t%lld\n", exp
->ex_stats
->start_time
);
777 seq_printf(m
, "\tfh_stale: %lld\n",
778 percpu_counter_sum_positive(&counter
[EXP_STATS_FH_STALE
]));
779 seq_printf(m
, "\tio_read: %lld\n",
780 percpu_counter_sum_positive(&counter
[EXP_STATS_IO_READ
]));
781 seq_printf(m
, "\tio_write: %lld\n",
782 percpu_counter_sum_positive(&counter
[EXP_STATS_IO_WRITE
]));
787 if (test_bit(CACHE_VALID
, &h
->flags
) &&
788 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
789 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
790 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
793 seq_puts(m
, ",uuid=");
794 for (i
= 0; i
< EX_UUID_LEN
; i
++) {
797 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
800 show_secinfo(m
, exp
);
805 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
807 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
808 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
809 return orig
->ex_client
== new->ex_client
&&
810 path_equal(&orig
->ex_path
, &new->ex_path
);
813 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
815 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
816 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
818 kref_get(&item
->ex_client
->ref
);
819 new->ex_client
= item
->ex_client
;
820 new->ex_path
= item
->ex_path
;
821 path_get(&item
->ex_path
);
822 new->ex_fslocs
.locations
= NULL
;
823 new->ex_fslocs
.locations_count
= 0;
824 new->ex_fslocs
.migrated
= 0;
825 new->ex_layout_types
= 0;
828 export_stats_reset(new->ex_stats
);
831 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
833 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
834 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
837 new->ex_flags
= item
->ex_flags
;
838 new->ex_anon_uid
= item
->ex_anon_uid
;
839 new->ex_anon_gid
= item
->ex_anon_gid
;
840 new->ex_fsid
= item
->ex_fsid
;
841 new->ex_devid_map
= item
->ex_devid_map
;
842 item
->ex_devid_map
= NULL
;
843 new->ex_uuid
= item
->ex_uuid
;
844 item
->ex_uuid
= NULL
;
845 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
846 item
->ex_fslocs
.locations
= NULL
;
847 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
848 item
->ex_fslocs
.locations_count
= 0;
849 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
850 item
->ex_fslocs
.migrated
= 0;
851 new->ex_layout_types
= item
->ex_layout_types
;
852 new->ex_nflavors
= item
->ex_nflavors
;
853 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
854 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
856 new->ex_xprtsec_modes
= item
->ex_xprtsec_modes
;
859 static struct cache_head
*svc_export_alloc(void)
861 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
865 i
->ex_stats
= kmalloc(sizeof(*(i
->ex_stats
)), GFP_KERNEL
);
871 if (export_stats_init(i
->ex_stats
)) {
880 static const struct cache_detail svc_export_cache_template
= {
881 .owner
= THIS_MODULE
,
882 .hash_size
= EXPORT_HASHMAX
,
883 .name
= "nfsd.export",
884 .cache_put
= svc_export_put
,
885 .cache_upcall
= svc_export_upcall
,
886 .cache_request
= svc_export_request
,
887 .cache_parse
= svc_export_parse
,
888 .cache_show
= svc_export_show
,
889 .match
= svc_export_match
,
890 .init
= svc_export_init
,
891 .update
= export_update
,
892 .alloc
= svc_export_alloc
,
896 svc_export_hash(struct svc_export
*exp
)
900 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
901 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
902 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
906 static struct svc_export
*
907 svc_export_lookup(struct svc_export
*exp
)
909 struct cache_head
*ch
;
910 int hash
= svc_export_hash(exp
);
912 ch
= sunrpc_cache_lookup_rcu(exp
->cd
, &exp
->h
, hash
);
914 return container_of(ch
, struct svc_export
, h
);
919 static struct svc_export
*
920 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
922 struct cache_head
*ch
;
923 int hash
= svc_export_hash(old
);
925 ch
= sunrpc_cache_update(old
->cd
, &new->h
, &old
->h
, hash
);
927 return container_of(ch
, struct svc_export
, h
);
933 static struct svc_expkey
*
934 exp_find_key(struct cache_detail
*cd
, struct auth_domain
*clp
, int fsid_type
,
935 u32
*fsidv
, struct cache_req
*reqp
)
937 struct svc_expkey key
, *ek
;
941 return ERR_PTR(-ENOENT
);
944 key
.ek_fsidtype
= fsid_type
;
945 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
947 ek
= svc_expkey_lookup(cd
, &key
);
949 return ERR_PTR(-ENOMEM
);
950 err
= cache_check(cd
, &ek
->h
, reqp
);
952 trace_nfsd_exp_find_key(&key
, err
);
958 static struct svc_export
*
959 exp_get_by_name(struct cache_detail
*cd
, struct auth_domain
*clp
,
960 const struct path
*path
, struct cache_req
*reqp
)
962 struct svc_export
*exp
, key
;
966 return ERR_PTR(-ENOENT
);
972 exp
= svc_export_lookup(&key
);
974 return ERR_PTR(-ENOMEM
);
975 err
= cache_check(cd
, &exp
->h
, reqp
);
977 trace_nfsd_exp_get_by_name(&key
, err
);
984 * Find the export entry for a given dentry.
986 static struct svc_export
*
987 exp_parent(struct cache_detail
*cd
, struct auth_domain
*clp
, struct path
*path
)
989 struct dentry
*saved
= dget(path
->dentry
);
990 struct svc_export
*exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
992 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
993 struct dentry
*parent
= dget_parent(path
->dentry
);
995 path
->dentry
= parent
;
996 exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
999 path
->dentry
= saved
;
1006 * Obtain the root fh on behalf of a client.
1007 * This could be done in user space, but I feel that it adds some safety
1008 * since its harder to fool a kernel module than a user space program.
1011 exp_rootfh(struct net
*net
, struct auth_domain
*clp
, char *name
,
1012 struct knfsd_fh
*f
, int maxsize
)
1014 struct svc_export
*exp
;
1016 struct inode
*inode
;
1019 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1020 struct cache_detail
*cd
= nn
->svc_export_cache
;
1023 /* NB: we probably ought to check that it's NUL-terminated */
1024 if (kern_path(name
, 0, &path
)) {
1025 printk("nfsd: exp_rootfh path not found %s", name
);
1028 inode
= d_inode(path
.dentry
);
1030 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1031 name
, path
.dentry
, clp
->name
,
1032 inode
->i_sb
->s_id
, inode
->i_ino
);
1033 exp
= exp_parent(cd
, clp
, &path
);
1040 * fh must be initialized before calling fh_compose
1042 fh_init(&fh
, maxsize
);
1043 if (fh_compose(&fh
, exp
, path
.dentry
, NULL
))
1047 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
1055 static struct svc_export
*exp_find(struct cache_detail
*cd
,
1056 struct auth_domain
*clp
, int fsid_type
,
1057 u32
*fsidv
, struct cache_req
*reqp
)
1059 struct svc_export
*exp
;
1060 struct nfsd_net
*nn
= net_generic(cd
->net
, nfsd_net_id
);
1061 struct svc_expkey
*ek
= exp_find_key(nn
->svc_expkey_cache
, clp
, fsid_type
, fsidv
, reqp
);
1063 return ERR_CAST(ek
);
1065 exp
= exp_get_by_name(cd
, clp
, &ek
->ek_path
, reqp
);
1066 cache_put(&ek
->h
, nn
->svc_expkey_cache
);
1069 return ERR_CAST(exp
);
1073 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
1075 struct exp_flavor_info
*f
, *end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1076 struct svc_xprt
*xprt
= rqstp
->rq_xprt
;
1078 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_NONE
) {
1079 if (!test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
))
1082 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_TLS
) {
1083 if (test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
) &&
1084 !test_bit(XPT_PEER_AUTH
, &xprt
->xpt_flags
))
1087 if (exp
->ex_xprtsec_modes
& NFSEXP_XPRTSEC_MTLS
) {
1088 if (test_bit(XPT_TLS_SESSION
, &xprt
->xpt_flags
) &&
1089 test_bit(XPT_PEER_AUTH
, &xprt
->xpt_flags
))
1095 /* legacy gss-only clients are always OK: */
1096 if (exp
->ex_client
== rqstp
->rq_gssclient
)
1098 /* ip-address based client; check sec= export option: */
1099 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
1100 if (f
->pseudoflavor
== rqstp
->rq_cred
.cr_flavor
)
1103 /* defaults in absence of sec= options: */
1104 if (exp
->ex_nflavors
== 0) {
1105 if (rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_NULL
||
1106 rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_UNIX
)
1110 /* If the compound op contains a spo_must_allowed op,
1111 * it will be sent with integrity/protection which
1112 * will have to be expressly allowed on mounts that
1116 if (nfsd4_spo_must_allow(rqstp
))
1120 return rqstp
->rq_vers
< 4 ? nfserr_acces
: nfserr_wrongsec
;
1124 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1125 * auth_unix client) if it's available and has secinfo information;
1126 * otherwise, will try to use rq_gssclient.
1128 * Called from functions that handle requests; functions that do work on
1129 * behalf of mountd are passed a single client name to use, and should
1130 * use exp_get_by_name() or exp_find().
1133 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct path
*path
)
1135 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1136 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1137 struct cache_detail
*cd
= nn
->svc_export_cache
;
1139 if (rqstp
->rq_client
== NULL
)
1142 /* First try the auth_unix client: */
1143 exp
= exp_get_by_name(cd
, rqstp
->rq_client
, path
, &rqstp
->rq_chandle
);
1144 if (PTR_ERR(exp
) == -ENOENT
)
1148 /* If it has secinfo, assume there are no gss/... clients */
1149 if (exp
->ex_nflavors
> 0)
1152 /* Otherwise, try falling back on gss client */
1153 if (rqstp
->rq_gssclient
== NULL
)
1155 gssexp
= exp_get_by_name(cd
, rqstp
->rq_gssclient
, path
, &rqstp
->rq_chandle
);
1156 if (PTR_ERR(gssexp
) == -ENOENT
)
1164 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1166 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1167 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1168 struct cache_detail
*cd
= nn
->svc_export_cache
;
1170 if (rqstp
->rq_client
== NULL
)
1173 /* First try the auth_unix client: */
1174 exp
= exp_find(cd
, rqstp
->rq_client
, fsid_type
,
1175 fsidv
, &rqstp
->rq_chandle
);
1176 if (PTR_ERR(exp
) == -ENOENT
)
1180 /* If it has secinfo, assume there are no gss/... clients */
1181 if (exp
->ex_nflavors
> 0)
1184 /* Otherwise, try falling back on gss client */
1185 if (rqstp
->rq_gssclient
== NULL
)
1187 gssexp
= exp_find(cd
, rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1188 &rqstp
->rq_chandle
);
1189 if (PTR_ERR(gssexp
) == -ENOENT
)
1197 rqst_exp_parent(struct svc_rqst
*rqstp
, struct path
*path
)
1199 struct dentry
*saved
= dget(path
->dentry
);
1200 struct svc_export
*exp
= rqst_exp_get_by_name(rqstp
, path
);
1202 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
1203 struct dentry
*parent
= dget_parent(path
->dentry
);
1205 path
->dentry
= parent
;
1206 exp
= rqst_exp_get_by_name(rqstp
, path
);
1209 path
->dentry
= saved
;
1213 struct svc_export
*rqst_find_fsidzero_export(struct svc_rqst
*rqstp
)
1217 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1219 return rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1223 * Called when we need the filehandle for the root of the pseudofs,
1224 * for a given NFSv4 client. The root is defined to be the
1225 * export point with fsid==0
1228 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1230 struct svc_export
*exp
;
1233 exp
= rqst_find_fsidzero_export(rqstp
);
1235 return nfserrno(PTR_ERR(exp
));
1236 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1241 static struct flags
{
1245 { NFSEXP_READONLY
, {"ro", "rw"}},
1246 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1247 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1248 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1249 { NFSEXP_ASYNC
, {"async", "sync"}},
1250 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1251 { NFSEXP_NOREADDIRPLUS
, {"nordirplus", ""}},
1252 { NFSEXP_NOHIDE
, {"nohide", ""}},
1253 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1254 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1255 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1256 { NFSEXP_V4ROOT
, {"v4root", ""}},
1257 { NFSEXP_PNFS
, {"pnfs", ""}},
1258 { NFSEXP_SECURITY_LABEL
, {"security_label", ""}},
1262 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1265 int state
, first
= 0;
1267 for (flg
= expflags
; flg
->flag
; flg
++) {
1268 if (flg
->flag
& ~mask
)
1270 state
= (flg
->flag
& flags
) ? 0 : 1;
1271 if (*flg
->name
[state
])
1272 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1276 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1279 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1282 static bool secinfo_flags_equal(int f
, int g
)
1284 f
&= NFSEXP_SECINFO_FLAGS
;
1285 g
&= NFSEXP_SECINFO_FLAGS
;
1289 static int show_secinfo_run(struct seq_file
*m
, struct exp_flavor_info
**fp
, struct exp_flavor_info
*end
)
1293 flags
= (*fp
)->flags
;
1294 seq_printf(m
, ",sec=%d", (*fp
)->pseudoflavor
);
1296 while (*fp
!= end
&& secinfo_flags_equal(flags
, (*fp
)->flags
)) {
1297 seq_printf(m
, ":%d", (*fp
)->pseudoflavor
);
1303 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1305 struct exp_flavor_info
*f
;
1306 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1309 if (exp
->ex_nflavors
== 0)
1311 f
= exp
->ex_flavors
;
1312 flags
= show_secinfo_run(m
, &f
, end
);
1313 if (!secinfo_flags_equal(flags
, exp
->ex_flags
))
1314 show_secinfo_flags(m
, flags
);
1316 flags
= show_secinfo_run(m
, &f
, end
);
1317 show_secinfo_flags(m
, flags
);
1321 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1322 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1324 struct user_namespace
*userns
= m
->file
->f_cred
->user_ns
;
1326 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1327 if (flag
& NFSEXP_FSID
)
1328 seq_printf(m
, ",fsid=%d", fsid
);
1329 if (!uid_eq(anonu
, make_kuid(userns
, (uid_t
)-2)) &&
1330 !uid_eq(anonu
, make_kuid(userns
, 0x10000-2)))
1331 seq_printf(m
, ",anonuid=%u", from_kuid_munged(userns
, anonu
));
1332 if (!gid_eq(anong
, make_kgid(userns
, (gid_t
)-2)) &&
1333 !gid_eq(anong
, make_kgid(userns
, 0x10000-2)))
1334 seq_printf(m
, ",anongid=%u", from_kgid_munged(userns
, anong
));
1335 if (fsloc
&& fsloc
->locations_count
> 0) {
1336 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1339 seq_printf(m
, ",%s=", loctype
);
1340 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1342 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1343 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1345 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1347 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1352 static int e_show(struct seq_file
*m
, void *p
)
1354 struct cache_head
*cp
= p
;
1355 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1356 struct cache_detail
*cd
= m
->private;
1357 bool export_stats
= is_export_stats_file(m
);
1359 if (p
== SEQ_START_TOKEN
) {
1360 seq_puts(m
, "# Version 1.1\n");
1362 seq_puts(m
, "# Path Client Start-time\n#\tStats\n");
1364 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1369 if (cache_check(cd
, &exp
->h
, NULL
))
1372 return svc_export_show(m
, cd
, cp
);
1375 const struct seq_operations nfs_exports_op
= {
1376 .start
= cache_seq_start_rcu
,
1377 .next
= cache_seq_next_rcu
,
1378 .stop
= cache_seq_stop_rcu
,
1383 * Initialize the exports module.
1386 nfsd_export_init(struct net
*net
)
1389 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1391 dprintk("nfsd: initializing export module (net: %x).\n", net
->ns
.inum
);
1393 nn
->svc_export_cache
= cache_create_net(&svc_export_cache_template
, net
);
1394 if (IS_ERR(nn
->svc_export_cache
))
1395 return PTR_ERR(nn
->svc_export_cache
);
1396 rv
= cache_register_net(nn
->svc_export_cache
, net
);
1398 goto destroy_export_cache
;
1400 nn
->svc_expkey_cache
= cache_create_net(&svc_expkey_cache_template
, net
);
1401 if (IS_ERR(nn
->svc_expkey_cache
)) {
1402 rv
= PTR_ERR(nn
->svc_expkey_cache
);
1403 goto unregister_export_cache
;
1405 rv
= cache_register_net(nn
->svc_expkey_cache
, net
);
1407 goto destroy_expkey_cache
;
1410 destroy_expkey_cache
:
1411 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1412 unregister_export_cache
:
1413 cache_unregister_net(nn
->svc_export_cache
, net
);
1414 destroy_export_cache
:
1415 cache_destroy_net(nn
->svc_export_cache
, net
);
1420 * Flush exports table - called when last nfsd thread is killed
1423 nfsd_export_flush(struct net
*net
)
1425 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1427 cache_purge(nn
->svc_expkey_cache
);
1428 cache_purge(nn
->svc_export_cache
);
1432 * Shutdown the exports module.
1435 nfsd_export_shutdown(struct net
*net
)
1437 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1439 dprintk("nfsd: shutting down export module (net: %x).\n", net
->ns
.inum
);
1441 cache_unregister_net(nn
->svc_expkey_cache
, net
);
1442 cache_unregister_net(nn
->svc_export_cache
, net
);
1443 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1444 cache_destroy_net(nn
->svc_export_cache
, net
);
1445 svcauth_unix_purge(net
);
1447 dprintk("nfsd: export shutdown complete (net: %x).\n", net
->ns
.inum
);