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>
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
30 * One maps client+vfsmnt+dentry to export options - the export map
31 * The other maps client+filehandle-fragment to export options. - the expkey map
33 * The export options are actually stored in the first map, and the
34 * second map contains a reference to the entry in the first map.
37 #define EXPKEY_HASHBITS 8
38 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
39 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
41 static void expkey_put(struct kref
*ref
)
43 struct svc_expkey
*key
= container_of(ref
, struct svc_expkey
, h
.ref
);
45 if (test_bit(CACHE_VALID
, &key
->h
.flags
) &&
46 !test_bit(CACHE_NEGATIVE
, &key
->h
.flags
))
47 path_put(&key
->ek_path
);
48 auth_domain_put(key
->ek_client
);
52 static void expkey_request(struct cache_detail
*cd
,
54 char **bpp
, int *blen
)
56 /* client fsidtype \xfsid */
57 struct svc_expkey
*ek
= container_of(h
, struct svc_expkey
, h
);
60 qword_add(bpp
, blen
, ek
->ek_client
->name
);
61 snprintf(type
, 5, "%d", ek
->ek_fsidtype
);
62 qword_add(bpp
, blen
, type
);
63 qword_addhex(bpp
, blen
, (char*)ek
->ek_fsid
, key_len(ek
->ek_fsidtype
));
67 static struct svc_expkey
*svc_expkey_update(struct cache_detail
*cd
, struct svc_expkey
*new,
68 struct svc_expkey
*old
);
69 static struct svc_expkey
*svc_expkey_lookup(struct cache_detail
*cd
, struct svc_expkey
*);
71 static int expkey_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
73 /* client fsidtype fsid expiry [path] */
76 struct auth_domain
*dom
= NULL
;
80 struct svc_expkey key
;
81 struct svc_expkey
*ek
= NULL
;
83 if (mesg
[mlen
- 1] != '\n')
87 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
93 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
97 dom
= auth_domain_find(buf
);
100 dprintk("found domain %s\n", buf
);
103 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
105 fsidtype
= simple_strtoul(buf
, &ep
, 10);
108 dprintk("found fsidtype %d\n", fsidtype
);
109 if (key_len(fsidtype
)==0) /* invalid type */
111 if ((len
=qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
113 dprintk("found fsid length %d\n", len
);
114 if (len
!= key_len(fsidtype
))
117 /* OK, we seem to have a valid key */
119 key
.h
.expiry_time
= get_expiry(&mesg
);
120 if (key
.h
.expiry_time
== 0)
124 key
.ek_fsidtype
= fsidtype
;
125 memcpy(key
.ek_fsid
, buf
, len
);
127 ek
= svc_expkey_lookup(cd
, &key
);
132 /* now we want a pathname, or empty meaning NEGATIVE */
134 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
137 dprintk("Path seems to be <%s>\n", buf
);
140 set_bit(CACHE_NEGATIVE
, &key
.h
.flags
);
141 ek
= svc_expkey_update(cd
, &key
, ek
);
145 err
= kern_path(buf
, 0, &key
.ek_path
);
149 dprintk("Found the path %s\n", buf
);
151 ek
= svc_expkey_update(cd
, &key
, ek
);
154 path_put(&key
.ek_path
);
159 cache_put(&ek
->h
, cd
);
161 auth_domain_put(dom
);
166 static int expkey_show(struct seq_file
*m
,
167 struct cache_detail
*cd
,
168 struct cache_head
*h
)
170 struct svc_expkey
*ek
;
174 seq_puts(m
, "#domain fsidtype fsid [path]\n");
177 ek
= container_of(h
, struct svc_expkey
, h
);
178 seq_printf(m
, "%s %d 0x", ek
->ek_client
->name
,
180 for (i
=0; i
< key_len(ek
->ek_fsidtype
)/4; i
++)
181 seq_printf(m
, "%08x", ek
->ek_fsid
[i
]);
182 if (test_bit(CACHE_VALID
, &h
->flags
) &&
183 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
185 seq_path(m
, &ek
->ek_path
, "\\ \t\n");
191 static inline int expkey_match (struct cache_head
*a
, struct cache_head
*b
)
193 struct svc_expkey
*orig
= container_of(a
, struct svc_expkey
, h
);
194 struct svc_expkey
*new = container_of(b
, struct svc_expkey
, h
);
196 if (orig
->ek_fsidtype
!= new->ek_fsidtype
||
197 orig
->ek_client
!= new->ek_client
||
198 memcmp(orig
->ek_fsid
, new->ek_fsid
, key_len(orig
->ek_fsidtype
)) != 0)
203 static inline void expkey_init(struct cache_head
*cnew
,
204 struct cache_head
*citem
)
206 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
207 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
209 kref_get(&item
->ek_client
->ref
);
210 new->ek_client
= item
->ek_client
;
211 new->ek_fsidtype
= item
->ek_fsidtype
;
213 memcpy(new->ek_fsid
, item
->ek_fsid
, sizeof(new->ek_fsid
));
216 static inline void expkey_update(struct cache_head
*cnew
,
217 struct cache_head
*citem
)
219 struct svc_expkey
*new = container_of(cnew
, struct svc_expkey
, h
);
220 struct svc_expkey
*item
= container_of(citem
, struct svc_expkey
, h
);
222 new->ek_path
= item
->ek_path
;
223 path_get(&item
->ek_path
);
226 static struct cache_head
*expkey_alloc(void)
228 struct svc_expkey
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
235 static const struct cache_detail svc_expkey_cache_template
= {
236 .owner
= THIS_MODULE
,
237 .hash_size
= EXPKEY_HASHMAX
,
239 .cache_put
= expkey_put
,
240 .cache_request
= expkey_request
,
241 .cache_parse
= expkey_parse
,
242 .cache_show
= expkey_show
,
243 .match
= expkey_match
,
245 .update
= expkey_update
,
246 .alloc
= expkey_alloc
,
250 svc_expkey_hash(struct svc_expkey
*item
)
252 int hash
= item
->ek_fsidtype
;
253 char * cp
= (char*)item
->ek_fsid
;
254 int len
= key_len(item
->ek_fsidtype
);
256 hash
^= hash_mem(cp
, len
, EXPKEY_HASHBITS
);
257 hash
^= hash_ptr(item
->ek_client
, EXPKEY_HASHBITS
);
258 hash
&= EXPKEY_HASHMASK
;
262 static struct svc_expkey
*
263 svc_expkey_lookup(struct cache_detail
*cd
, struct svc_expkey
*item
)
265 struct cache_head
*ch
;
266 int hash
= svc_expkey_hash(item
);
268 ch
= sunrpc_cache_lookup(cd
, &item
->h
, hash
);
270 return container_of(ch
, struct svc_expkey
, h
);
275 static struct svc_expkey
*
276 svc_expkey_update(struct cache_detail
*cd
, struct svc_expkey
*new,
277 struct svc_expkey
*old
)
279 struct cache_head
*ch
;
280 int hash
= svc_expkey_hash(new);
282 ch
= sunrpc_cache_update(cd
, &new->h
, &old
->h
, hash
);
284 return container_of(ch
, struct svc_expkey
, h
);
290 #define EXPORT_HASHBITS 8
291 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
293 static void nfsd4_fslocs_free(struct nfsd4_fs_locations
*fsloc
)
295 struct nfsd4_fs_location
*locations
= fsloc
->locations
;
301 for (i
= 0; i
< fsloc
->locations_count
; i
++) {
302 kfree(locations
[i
].path
);
303 kfree(locations
[i
].hosts
);
307 fsloc
->locations
= NULL
;
310 static void svc_export_put(struct kref
*ref
)
312 struct svc_export
*exp
= container_of(ref
, struct svc_export
, h
.ref
);
313 path_put(&exp
->ex_path
);
314 auth_domain_put(exp
->ex_client
);
315 nfsd4_fslocs_free(&exp
->ex_fslocs
);
320 static void svc_export_request(struct cache_detail
*cd
,
321 struct cache_head
*h
,
322 char **bpp
, int *blen
)
325 struct svc_export
*exp
= container_of(h
, struct svc_export
, h
);
328 qword_add(bpp
, blen
, exp
->ex_client
->name
);
329 pth
= d_path(&exp
->ex_path
, *bpp
, *blen
);
331 /* is this correct? */
335 qword_add(bpp
, blen
, pth
);
339 static struct svc_export
*svc_export_update(struct svc_export
*new,
340 struct svc_export
*old
);
341 static struct svc_export
*svc_export_lookup(struct svc_export
*);
343 static int check_export(struct inode
*inode
, int *flags
, unsigned char *uuid
)
347 * We currently export only dirs, regular files, and (for v4
348 * pseudoroot) symlinks.
350 if (!S_ISDIR(inode
->i_mode
) &&
351 !S_ISLNK(inode
->i_mode
) &&
352 !S_ISREG(inode
->i_mode
))
356 * Mountd should never pass down a writeable V4ROOT export, but,
359 if (*flags
& NFSEXP_V4ROOT
)
360 *flags
|= NFSEXP_READONLY
;
362 /* There are two requirements on a filesystem to be exportable.
363 * 1: We must be able to identify the filesystem from a number.
364 * either a device number (so FS_REQUIRES_DEV needed)
365 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
366 * 2: We must be able to find an inode from a filehandle.
367 * This means that s_export_op must be set.
369 if (!(inode
->i_sb
->s_type
->fs_flags
& FS_REQUIRES_DEV
) &&
370 !(*flags
& NFSEXP_FSID
) &&
372 dprintk("exp_export: export of non-dev fs without fsid\n");
376 if (!inode
->i_sb
->s_export_op
||
377 !inode
->i_sb
->s_export_op
->fh_to_dentry
) {
378 dprintk("exp_export: export of invalid fs type.\n");
386 #ifdef CONFIG_NFSD_V4
389 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
)
392 int migrated
, i
, err
;
394 /* more than one fsloc */
395 if (fsloc
->locations
)
399 err
= get_uint(mesg
, &fsloc
->locations_count
);
402 if (fsloc
->locations_count
> MAX_FS_LOCATIONS
)
404 if (fsloc
->locations_count
== 0)
407 fsloc
->locations
= kzalloc(fsloc
->locations_count
408 * sizeof(struct nfsd4_fs_location
), GFP_KERNEL
);
409 if (!fsloc
->locations
)
411 for (i
=0; i
< fsloc
->locations_count
; i
++) {
412 /* colon separated host list */
414 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
418 fsloc
->locations
[i
].hosts
= kstrdup(buf
, GFP_KERNEL
);
419 if (!fsloc
->locations
[i
].hosts
)
422 /* slash separated path component list */
423 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
427 fsloc
->locations
[i
].path
= kstrdup(buf
, GFP_KERNEL
);
428 if (!fsloc
->locations
[i
].path
)
432 err
= get_int(mesg
, &migrated
);
436 if (migrated
< 0 || migrated
> 1)
438 fsloc
->migrated
= migrated
;
441 nfsd4_fslocs_free(fsloc
);
445 static int secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
)
447 struct exp_flavor_info
*f
;
451 /* more than one secinfo */
452 if (exp
->ex_nflavors
)
455 err
= get_uint(mesg
, &listsize
);
458 if (listsize
> MAX_SECINFO_LIST
)
461 for (f
= exp
->ex_flavors
; f
< exp
->ex_flavors
+ listsize
; f
++) {
462 err
= get_uint(mesg
, &f
->pseudoflavor
);
466 * XXX: It would be nice to also check whether this
467 * pseudoflavor is supported, so we can discover the
468 * problem at export time instead of when a client fails
471 err
= get_uint(mesg
, &f
->flags
);
474 /* Only some flags are allowed to differ between flavors: */
475 if (~NFSEXP_SECINFO_FLAGS
& (f
->flags
^ exp
->ex_flags
))
478 exp
->ex_nflavors
= listsize
;
482 #else /* CONFIG_NFSD_V4 */
484 fsloc_parse(char **mesg
, char *buf
, struct nfsd4_fs_locations
*fsloc
){return 0;}
486 secinfo_parse(char **mesg
, char *buf
, struct svc_export
*exp
) { return 0; }
490 nfsd_uuid_parse(char **mesg
, char *buf
, unsigned char **puuid
)
494 /* more than one uuid */
498 /* expect a 16 byte uuid encoded as \xXXXX... */
499 len
= qword_get(mesg
, buf
, PAGE_SIZE
);
500 if (len
!= EX_UUID_LEN
)
503 *puuid
= kmemdup(buf
, EX_UUID_LEN
, GFP_KERNEL
);
510 static int svc_export_parse(struct cache_detail
*cd
, char *mesg
, int mlen
)
512 /* client path expiry [flags anonuid anongid fsid] */
516 struct auth_domain
*dom
= NULL
;
517 struct svc_export exp
= {}, *expp
;
520 if (mesg
[mlen
-1] != '\n')
524 buf
= kmalloc(PAGE_SIZE
, GFP_KERNEL
);
530 len
= qword_get(&mesg
, buf
, PAGE_SIZE
);
535 dom
= auth_domain_find(buf
);
541 if ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) <= 0)
544 err
= kern_path(buf
, 0, &exp
.ex_path
);
550 exp
.ex_devid_map
= NULL
;
554 exp
.h
.expiry_time
= get_expiry(&mesg
);
555 if (exp
.h
.expiry_time
== 0)
559 err
= get_int(&mesg
, &an_int
);
560 if (err
== -ENOENT
) {
562 set_bit(CACHE_NEGATIVE
, &exp
.h
.flags
);
564 if (err
|| an_int
< 0)
566 exp
.ex_flags
= an_int
;
569 err
= get_int(&mesg
, &an_int
);
572 exp
.ex_anon_uid
= make_kuid(&init_user_ns
, an_int
);
575 err
= get_int(&mesg
, &an_int
);
578 exp
.ex_anon_gid
= make_kgid(&init_user_ns
, an_int
);
581 err
= get_int(&mesg
, &an_int
);
584 exp
.ex_fsid
= an_int
;
586 while ((len
= qword_get(&mesg
, buf
, PAGE_SIZE
)) > 0) {
587 if (strcmp(buf
, "fsloc") == 0)
588 err
= fsloc_parse(&mesg
, buf
, &exp
.ex_fslocs
);
589 else if (strcmp(buf
, "uuid") == 0)
590 err
= nfsd_uuid_parse(&mesg
, buf
, &exp
.ex_uuid
);
591 else if (strcmp(buf
, "secinfo") == 0)
592 err
= secinfo_parse(&mesg
, buf
, &exp
);
594 /* quietly ignore unknown words and anything
595 * following. Newer user-space can try to set
596 * new values, then see what the result was.
603 err
= check_export(d_inode(exp
.ex_path
.dentry
), &exp
.ex_flags
,
608 * No point caching this if it would immediately expire.
609 * Also, this protects exportfs's dummy export from the
610 * anon_uid/anon_gid checks:
612 if (exp
.h
.expiry_time
< seconds_since_boot())
615 * For some reason exportfs has been passing down an
616 * invalid (-1) uid & gid on the "dummy" export which it
617 * uses to test export support. To make sure exportfs
618 * sees errors from check_export we therefore need to
619 * delay these checks till after check_export:
622 if (!uid_valid(exp
.ex_anon_uid
))
624 if (!gid_valid(exp
.ex_anon_gid
))
628 nfsd4_setup_layout_type(&exp
);
631 expp
= svc_export_lookup(&exp
);
633 expp
= svc_export_update(&exp
, expp
);
642 nfsd4_fslocs_free(&exp
.ex_fslocs
);
645 path_put(&exp
.ex_path
);
647 auth_domain_put(dom
);
653 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
654 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fslocs
);
655 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
);
657 static int svc_export_show(struct seq_file
*m
,
658 struct cache_detail
*cd
,
659 struct cache_head
*h
)
661 struct svc_export
*exp
;
664 seq_puts(m
, "#path domain(flags)\n");
667 exp
= container_of(h
, struct svc_export
, h
);
668 seq_path(m
, &exp
->ex_path
, " \t\n\\");
670 seq_escape(m
, exp
->ex_client
->name
, " \t\n\\");
672 if (test_bit(CACHE_VALID
, &h
->flags
) &&
673 !test_bit(CACHE_NEGATIVE
, &h
->flags
)) {
674 exp_flags(m
, exp
->ex_flags
, exp
->ex_fsid
,
675 exp
->ex_anon_uid
, exp
->ex_anon_gid
, &exp
->ex_fslocs
);
678 seq_puts(m
, ",uuid=");
679 for (i
= 0; i
< EX_UUID_LEN
; i
++) {
682 seq_printf(m
, "%02x", exp
->ex_uuid
[i
]);
685 show_secinfo(m
, exp
);
690 static int svc_export_match(struct cache_head
*a
, struct cache_head
*b
)
692 struct svc_export
*orig
= container_of(a
, struct svc_export
, h
);
693 struct svc_export
*new = container_of(b
, struct svc_export
, h
);
694 return orig
->ex_client
== new->ex_client
&&
695 path_equal(&orig
->ex_path
, &new->ex_path
);
698 static void svc_export_init(struct cache_head
*cnew
, struct cache_head
*citem
)
700 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
701 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
703 kref_get(&item
->ex_client
->ref
);
704 new->ex_client
= item
->ex_client
;
705 new->ex_path
= item
->ex_path
;
706 path_get(&item
->ex_path
);
707 new->ex_fslocs
.locations
= NULL
;
708 new->ex_fslocs
.locations_count
= 0;
709 new->ex_fslocs
.migrated
= 0;
710 new->ex_layout_types
= 0;
715 static void export_update(struct cache_head
*cnew
, struct cache_head
*citem
)
717 struct svc_export
*new = container_of(cnew
, struct svc_export
, h
);
718 struct svc_export
*item
= container_of(citem
, struct svc_export
, h
);
721 new->ex_flags
= item
->ex_flags
;
722 new->ex_anon_uid
= item
->ex_anon_uid
;
723 new->ex_anon_gid
= item
->ex_anon_gid
;
724 new->ex_fsid
= item
->ex_fsid
;
725 new->ex_devid_map
= item
->ex_devid_map
;
726 item
->ex_devid_map
= NULL
;
727 new->ex_uuid
= item
->ex_uuid
;
728 item
->ex_uuid
= NULL
;
729 new->ex_fslocs
.locations
= item
->ex_fslocs
.locations
;
730 item
->ex_fslocs
.locations
= NULL
;
731 new->ex_fslocs
.locations_count
= item
->ex_fslocs
.locations_count
;
732 item
->ex_fslocs
.locations_count
= 0;
733 new->ex_fslocs
.migrated
= item
->ex_fslocs
.migrated
;
734 item
->ex_fslocs
.migrated
= 0;
735 new->ex_layout_types
= item
->ex_layout_types
;
736 new->ex_nflavors
= item
->ex_nflavors
;
737 for (i
= 0; i
< MAX_SECINFO_LIST
; i
++) {
738 new->ex_flavors
[i
] = item
->ex_flavors
[i
];
742 static struct cache_head
*svc_export_alloc(void)
744 struct svc_export
*i
= kmalloc(sizeof(*i
), GFP_KERNEL
);
751 static const struct cache_detail svc_export_cache_template
= {
752 .owner
= THIS_MODULE
,
753 .hash_size
= EXPORT_HASHMAX
,
754 .name
= "nfsd.export",
755 .cache_put
= svc_export_put
,
756 .cache_request
= svc_export_request
,
757 .cache_parse
= svc_export_parse
,
758 .cache_show
= svc_export_show
,
759 .match
= svc_export_match
,
760 .init
= svc_export_init
,
761 .update
= export_update
,
762 .alloc
= svc_export_alloc
,
766 svc_export_hash(struct svc_export
*exp
)
770 hash
= hash_ptr(exp
->ex_client
, EXPORT_HASHBITS
);
771 hash
^= hash_ptr(exp
->ex_path
.dentry
, EXPORT_HASHBITS
);
772 hash
^= hash_ptr(exp
->ex_path
.mnt
, EXPORT_HASHBITS
);
776 static struct svc_export
*
777 svc_export_lookup(struct svc_export
*exp
)
779 struct cache_head
*ch
;
780 int hash
= svc_export_hash(exp
);
782 ch
= sunrpc_cache_lookup(exp
->cd
, &exp
->h
, hash
);
784 return container_of(ch
, struct svc_export
, h
);
789 static struct svc_export
*
790 svc_export_update(struct svc_export
*new, struct svc_export
*old
)
792 struct cache_head
*ch
;
793 int hash
= svc_export_hash(old
);
795 ch
= sunrpc_cache_update(old
->cd
, &new->h
, &old
->h
, hash
);
797 return container_of(ch
, struct svc_export
, h
);
803 static struct svc_expkey
*
804 exp_find_key(struct cache_detail
*cd
, struct auth_domain
*clp
, int fsid_type
,
805 u32
*fsidv
, struct cache_req
*reqp
)
807 struct svc_expkey key
, *ek
;
811 return ERR_PTR(-ENOENT
);
814 key
.ek_fsidtype
= fsid_type
;
815 memcpy(key
.ek_fsid
, fsidv
, key_len(fsid_type
));
817 ek
= svc_expkey_lookup(cd
, &key
);
819 return ERR_PTR(-ENOMEM
);
820 err
= cache_check(cd
, &ek
->h
, reqp
);
826 static struct svc_export
*
827 exp_get_by_name(struct cache_detail
*cd
, struct auth_domain
*clp
,
828 const struct path
*path
, struct cache_req
*reqp
)
830 struct svc_export
*exp
, key
;
834 return ERR_PTR(-ENOENT
);
840 exp
= svc_export_lookup(&key
);
842 return ERR_PTR(-ENOMEM
);
843 err
= cache_check(cd
, &exp
->h
, reqp
);
850 * Find the export entry for a given dentry.
852 static struct svc_export
*
853 exp_parent(struct cache_detail
*cd
, struct auth_domain
*clp
, struct path
*path
)
855 struct dentry
*saved
= dget(path
->dentry
);
856 struct svc_export
*exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
858 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
859 struct dentry
*parent
= dget_parent(path
->dentry
);
861 path
->dentry
= parent
;
862 exp
= exp_get_by_name(cd
, clp
, path
, NULL
);
865 path
->dentry
= saved
;
872 * Obtain the root fh on behalf of a client.
873 * This could be done in user space, but I feel that it adds some safety
874 * since its harder to fool a kernel module than a user space program.
877 exp_rootfh(struct net
*net
, struct auth_domain
*clp
, char *name
,
878 struct knfsd_fh
*f
, int maxsize
)
880 struct svc_export
*exp
;
885 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
886 struct cache_detail
*cd
= nn
->svc_export_cache
;
889 /* NB: we probably ought to check that it's NUL-terminated */
890 if (kern_path(name
, 0, &path
)) {
891 printk("nfsd: exp_rootfh path not found %s", name
);
894 inode
= d_inode(path
.dentry
);
896 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
897 name
, path
.dentry
, clp
->name
,
898 inode
->i_sb
->s_id
, inode
->i_ino
);
899 exp
= exp_parent(cd
, clp
, &path
);
906 * fh must be initialized before calling fh_compose
908 fh_init(&fh
, maxsize
);
909 if (fh_compose(&fh
, exp
, path
.dentry
, NULL
))
913 memcpy(f
, &fh
.fh_handle
, sizeof(struct knfsd_fh
));
921 static struct svc_export
*exp_find(struct cache_detail
*cd
,
922 struct auth_domain
*clp
, int fsid_type
,
923 u32
*fsidv
, struct cache_req
*reqp
)
925 struct svc_export
*exp
;
926 struct nfsd_net
*nn
= net_generic(cd
->net
, nfsd_net_id
);
927 struct svc_expkey
*ek
= exp_find_key(nn
->svc_expkey_cache
, clp
, fsid_type
, fsidv
, reqp
);
931 exp
= exp_get_by_name(cd
, clp
, &ek
->ek_path
, reqp
);
932 cache_put(&ek
->h
, nn
->svc_expkey_cache
);
935 return ERR_CAST(exp
);
939 __be32
check_nfsd_access(struct svc_export
*exp
, struct svc_rqst
*rqstp
)
941 struct exp_flavor_info
*f
;
942 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
944 /* legacy gss-only clients are always OK: */
945 if (exp
->ex_client
== rqstp
->rq_gssclient
)
947 /* ip-address based client; check sec= export option: */
948 for (f
= exp
->ex_flavors
; f
< end
; f
++) {
949 if (f
->pseudoflavor
== rqstp
->rq_cred
.cr_flavor
)
952 /* defaults in absence of sec= options: */
953 if (exp
->ex_nflavors
== 0) {
954 if (rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_NULL
||
955 rqstp
->rq_cred
.cr_flavor
== RPC_AUTH_UNIX
)
959 /* If the compound op contains a spo_must_allowed op,
960 * it will be sent with integrity/protection which
961 * will have to be expressly allowed on mounts that
965 if (nfsd4_spo_must_allow(rqstp
))
968 return nfserr_wrongsec
;
972 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
973 * auth_unix client) if it's available and has secinfo information;
974 * otherwise, will try to use rq_gssclient.
976 * Called from functions that handle requests; functions that do work on
977 * behalf of mountd are passed a single client name to use, and should
978 * use exp_get_by_name() or exp_find().
981 rqst_exp_get_by_name(struct svc_rqst
*rqstp
, struct path
*path
)
983 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
984 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
985 struct cache_detail
*cd
= nn
->svc_export_cache
;
987 if (rqstp
->rq_client
== NULL
)
990 /* First try the auth_unix client: */
991 exp
= exp_get_by_name(cd
, rqstp
->rq_client
, path
, &rqstp
->rq_chandle
);
992 if (PTR_ERR(exp
) == -ENOENT
)
996 /* If it has secinfo, assume there are no gss/... clients */
997 if (exp
->ex_nflavors
> 0)
1000 /* Otherwise, try falling back on gss client */
1001 if (rqstp
->rq_gssclient
== NULL
)
1003 gssexp
= exp_get_by_name(cd
, rqstp
->rq_gssclient
, path
, &rqstp
->rq_chandle
);
1004 if (PTR_ERR(gssexp
) == -ENOENT
)
1012 rqst_exp_find(struct svc_rqst
*rqstp
, int fsid_type
, u32
*fsidv
)
1014 struct svc_export
*gssexp
, *exp
= ERR_PTR(-ENOENT
);
1015 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1016 struct cache_detail
*cd
= nn
->svc_export_cache
;
1018 if (rqstp
->rq_client
== NULL
)
1021 /* First try the auth_unix client: */
1022 exp
= exp_find(cd
, rqstp
->rq_client
, fsid_type
,
1023 fsidv
, &rqstp
->rq_chandle
);
1024 if (PTR_ERR(exp
) == -ENOENT
)
1028 /* If it has secinfo, assume there are no gss/... clients */
1029 if (exp
->ex_nflavors
> 0)
1032 /* Otherwise, try falling back on gss client */
1033 if (rqstp
->rq_gssclient
== NULL
)
1035 gssexp
= exp_find(cd
, rqstp
->rq_gssclient
, fsid_type
, fsidv
,
1036 &rqstp
->rq_chandle
);
1037 if (PTR_ERR(gssexp
) == -ENOENT
)
1045 rqst_exp_parent(struct svc_rqst
*rqstp
, struct path
*path
)
1047 struct dentry
*saved
= dget(path
->dentry
);
1048 struct svc_export
*exp
= rqst_exp_get_by_name(rqstp
, path
);
1050 while (PTR_ERR(exp
) == -ENOENT
&& !IS_ROOT(path
->dentry
)) {
1051 struct dentry
*parent
= dget_parent(path
->dentry
);
1053 path
->dentry
= parent
;
1054 exp
= rqst_exp_get_by_name(rqstp
, path
);
1057 path
->dentry
= saved
;
1061 struct svc_export
*rqst_find_fsidzero_export(struct svc_rqst
*rqstp
)
1065 mk_fsid(FSID_NUM
, fsidv
, 0, 0, 0, NULL
);
1067 return rqst_exp_find(rqstp
, FSID_NUM
, fsidv
);
1071 * Called when we need the filehandle for the root of the pseudofs,
1072 * for a given NFSv4 client. The root is defined to be the
1073 * export point with fsid==0
1076 exp_pseudoroot(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
)
1078 struct svc_export
*exp
;
1081 exp
= rqst_find_fsidzero_export(rqstp
);
1083 return nfserrno(PTR_ERR(exp
));
1084 rv
= fh_compose(fhp
, exp
, exp
->ex_path
.dentry
, NULL
);
1089 static struct flags
{
1093 { NFSEXP_READONLY
, {"ro", "rw"}},
1094 { NFSEXP_INSECURE_PORT
, {"insecure", ""}},
1095 { NFSEXP_ROOTSQUASH
, {"root_squash", "no_root_squash"}},
1096 { NFSEXP_ALLSQUASH
, {"all_squash", ""}},
1097 { NFSEXP_ASYNC
, {"async", "sync"}},
1098 { NFSEXP_GATHERED_WRITES
, {"wdelay", "no_wdelay"}},
1099 { NFSEXP_NOREADDIRPLUS
, {"nordirplus", ""}},
1100 { NFSEXP_NOHIDE
, {"nohide", ""}},
1101 { NFSEXP_CROSSMOUNT
, {"crossmnt", ""}},
1102 { NFSEXP_NOSUBTREECHECK
, {"no_subtree_check", ""}},
1103 { NFSEXP_NOAUTHNLM
, {"insecure_locks", ""}},
1104 { NFSEXP_V4ROOT
, {"v4root", ""}},
1105 { NFSEXP_PNFS
, {"pnfs", ""}},
1106 { NFSEXP_SECURITY_LABEL
, {"security_label", ""}},
1110 static void show_expflags(struct seq_file
*m
, int flags
, int mask
)
1113 int state
, first
= 0;
1115 for (flg
= expflags
; flg
->flag
; flg
++) {
1116 if (flg
->flag
& ~mask
)
1118 state
= (flg
->flag
& flags
) ? 0 : 1;
1119 if (*flg
->name
[state
])
1120 seq_printf(m
, "%s%s", first
++?",":"", flg
->name
[state
]);
1124 static void show_secinfo_flags(struct seq_file
*m
, int flags
)
1127 show_expflags(m
, flags
, NFSEXP_SECINFO_FLAGS
);
1130 static bool secinfo_flags_equal(int f
, int g
)
1132 f
&= NFSEXP_SECINFO_FLAGS
;
1133 g
&= NFSEXP_SECINFO_FLAGS
;
1137 static int show_secinfo_run(struct seq_file
*m
, struct exp_flavor_info
**fp
, struct exp_flavor_info
*end
)
1141 flags
= (*fp
)->flags
;
1142 seq_printf(m
, ",sec=%d", (*fp
)->pseudoflavor
);
1144 while (*fp
!= end
&& secinfo_flags_equal(flags
, (*fp
)->flags
)) {
1145 seq_printf(m
, ":%d", (*fp
)->pseudoflavor
);
1151 static void show_secinfo(struct seq_file
*m
, struct svc_export
*exp
)
1153 struct exp_flavor_info
*f
;
1154 struct exp_flavor_info
*end
= exp
->ex_flavors
+ exp
->ex_nflavors
;
1157 if (exp
->ex_nflavors
== 0)
1159 f
= exp
->ex_flavors
;
1160 flags
= show_secinfo_run(m
, &f
, end
);
1161 if (!secinfo_flags_equal(flags
, exp
->ex_flags
))
1162 show_secinfo_flags(m
, flags
);
1164 flags
= show_secinfo_run(m
, &f
, end
);
1165 show_secinfo_flags(m
, flags
);
1169 static void exp_flags(struct seq_file
*m
, int flag
, int fsid
,
1170 kuid_t anonu
, kgid_t anong
, struct nfsd4_fs_locations
*fsloc
)
1172 show_expflags(m
, flag
, NFSEXP_ALLFLAGS
);
1173 if (flag
& NFSEXP_FSID
)
1174 seq_printf(m
, ",fsid=%d", fsid
);
1175 if (!uid_eq(anonu
, make_kuid(&init_user_ns
, (uid_t
)-2)) &&
1176 !uid_eq(anonu
, make_kuid(&init_user_ns
, 0x10000-2)))
1177 seq_printf(m
, ",anonuid=%u", from_kuid(&init_user_ns
, anonu
));
1178 if (!gid_eq(anong
, make_kgid(&init_user_ns
, (gid_t
)-2)) &&
1179 !gid_eq(anong
, make_kgid(&init_user_ns
, 0x10000-2)))
1180 seq_printf(m
, ",anongid=%u", from_kgid(&init_user_ns
, anong
));
1181 if (fsloc
&& fsloc
->locations_count
> 0) {
1182 char *loctype
= (fsloc
->migrated
) ? "refer" : "replicas";
1185 seq_printf(m
, ",%s=", loctype
);
1186 seq_escape(m
, fsloc
->locations
[0].path
, ",;@ \t\n\\");
1188 seq_escape(m
, fsloc
->locations
[0].hosts
, ",;@ \t\n\\");
1189 for (i
= 1; i
< fsloc
->locations_count
; i
++) {
1191 seq_escape(m
, fsloc
->locations
[i
].path
, ",;@ \t\n\\");
1193 seq_escape(m
, fsloc
->locations
[i
].hosts
, ",;@ \t\n\\");
1198 static int e_show(struct seq_file
*m
, void *p
)
1200 struct cache_head
*cp
= p
;
1201 struct svc_export
*exp
= container_of(cp
, struct svc_export
, h
);
1202 struct cache_detail
*cd
= m
->private;
1204 if (p
== SEQ_START_TOKEN
) {
1205 seq_puts(m
, "# Version 1.1\n");
1206 seq_puts(m
, "# Path Client(Flags) # IPs\n");
1211 if (cache_check(cd
, &exp
->h
, NULL
))
1214 return svc_export_show(m
, cd
, cp
);
1217 const struct seq_operations nfs_exports_op
= {
1218 .start
= cache_seq_start
,
1219 .next
= cache_seq_next
,
1220 .stop
= cache_seq_stop
,
1225 * Initialize the exports module.
1228 nfsd_export_init(struct net
*net
)
1231 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1233 dprintk("nfsd: initializing export module (net: %x).\n", net
->ns
.inum
);
1235 nn
->svc_export_cache
= cache_create_net(&svc_export_cache_template
, net
);
1236 if (IS_ERR(nn
->svc_export_cache
))
1237 return PTR_ERR(nn
->svc_export_cache
);
1238 rv
= cache_register_net(nn
->svc_export_cache
, net
);
1240 goto destroy_export_cache
;
1242 nn
->svc_expkey_cache
= cache_create_net(&svc_expkey_cache_template
, net
);
1243 if (IS_ERR(nn
->svc_expkey_cache
)) {
1244 rv
= PTR_ERR(nn
->svc_expkey_cache
);
1245 goto unregister_export_cache
;
1247 rv
= cache_register_net(nn
->svc_expkey_cache
, net
);
1249 goto destroy_expkey_cache
;
1252 destroy_expkey_cache
:
1253 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1254 unregister_export_cache
:
1255 cache_unregister_net(nn
->svc_export_cache
, net
);
1256 destroy_export_cache
:
1257 cache_destroy_net(nn
->svc_export_cache
, net
);
1262 * Flush exports table - called when last nfsd thread is killed
1265 nfsd_export_flush(struct net
*net
)
1267 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1269 cache_purge(nn
->svc_expkey_cache
);
1270 cache_purge(nn
->svc_export_cache
);
1274 * Shutdown the exports module.
1277 nfsd_export_shutdown(struct net
*net
)
1279 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1281 dprintk("nfsd: shutting down export module (net: %x).\n", net
->ns
.inum
);
1283 cache_unregister_net(nn
->svc_expkey_cache
, net
);
1284 cache_unregister_net(nn
->svc_export_cache
, net
);
1285 cache_destroy_net(nn
->svc_expkey_cache
, net
);
1286 cache_destroy_net(nn
->svc_export_cache
, net
);
1287 svcauth_unix_purge(net
);
1289 dprintk("nfsd: export shutdown complete (net: %x).\n", net
->ns
.inum
);