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.
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);