2 * NFS exporting and validation.
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
14 #include <linux/slab.h>
15 #include <linux/namei.h>
16 #include <linux/module.h>
17 #include <linux/exportfs.h>
18 #include <linux/sunrpc/svc_xprt.h>
24 #include "filecache.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);
239 * Take the nfsd_mutex here to ensure that the file cache is not
240 * destroyed while we're in the middle of flushing.
242 mutex_lock(&nfsd_mutex);
243 nfsd_file_cache_purge();
244 mutex_unlock(&nfsd_mutex);
247 static struct cache_detail svc_expkey_cache_template = {
248 .owner = THIS_MODULE,
249 .hash_size = EXPKEY_HASHMAX,
251 .cache_put = expkey_put,
252 .cache_request = expkey_request,
253 .cache_parse = expkey_parse,
254 .cache_show = expkey_show,
255 .match = expkey_match,
257 .update = expkey_update,
258 .alloc = expkey_alloc,
259 .flush = expkey_flush,
263 svc_expkey_hash(struct svc_expkey *item)
265 int hash = item->ek_fsidtype;
266 char * cp = (char*)item->ek_fsid;
267 int len = key_len(item->ek_fsidtype);
269 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
270 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
271 hash &= EXPKEY_HASHMASK;
275 static struct svc_expkey *
276 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(item);
281 ch = sunrpc_cache_lookup(cd, &item->h, hash);
283 return container_of(ch, struct svc_expkey, h);
288 static struct svc_expkey *
289 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
290 struct svc_expkey *old)
292 struct cache_head *ch;
293 int hash = svc_expkey_hash(new);
295 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
297 return container_of(ch, struct svc_expkey, h);
303 #define EXPORT_HASHBITS 8
304 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
306 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
308 struct nfsd4_fs_location *locations = fsloc->locations;
314 for (i = 0; i < fsloc->locations_count; i++) {
315 kfree(locations[i].path);
316 kfree(locations[i].hosts);
320 fsloc->locations = NULL;
323 static void svc_export_put(struct kref *ref)
325 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
326 path_put(&exp->ex_path);
327 auth_domain_put(exp->ex_client);
328 nfsd4_fslocs_free(&exp->ex_fslocs);
333 static void svc_export_request(struct cache_detail *cd,
334 struct cache_head *h,
335 char **bpp, int *blen)
338 struct svc_export *exp = container_of(h, struct svc_export, h);
341 qword_add(bpp, blen, exp->ex_client->name);
342 pth = d_path(&exp->ex_path, *bpp, *blen);
344 /* is this correct? */
348 qword_add(bpp, blen, pth);
352 static struct svc_export *svc_export_update(struct svc_export *new,
353 struct svc_export *old);
354 static struct svc_export *svc_export_lookup(struct svc_export *);
356 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
360 * We currently export only dirs, regular files, and (for v4
361 * pseudoroot) symlinks.
363 if (!S_ISDIR(inode->i_mode) &&
364 !S_ISLNK(inode->i_mode) &&
365 !S_ISREG(inode->i_mode))
369 * Mountd should never pass down a writeable V4ROOT export, but,
372 if (*flags & NFSEXP_V4ROOT)
373 *flags |= NFSEXP_READONLY;
375 /* There are two requirements on a filesystem to be exportable.
376 * 1: We must be able to identify the filesystem from a number.
377 * either a device number (so FS_REQUIRES_DEV needed)
378 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
379 * 2: We must be able to find an inode from a filehandle.
380 * This means that s_export_op must be set.
382 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
383 !(*flags & NFSEXP_FSID) &&
385 dprintk("exp_export: export of non-dev fs without fsid\n");
389 if (!inode->i_sb->s_export_op ||
390 !inode->i_sb->s_export_op->fh_to_dentry) {
391 dprintk("exp_export: export of invalid fs type.\n");
399 #ifdef CONFIG_NFSD_V4
402 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
405 int migrated, i, err;
407 /* more than one fsloc */
408 if (fsloc->locations)
412 err = get_uint(mesg, &fsloc->locations_count);
415 if (fsloc->locations_count > MAX_FS_LOCATIONS)
417 if (fsloc->locations_count == 0)
420 fsloc->locations = kzalloc(fsloc->locations_count
421 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
422 if (!fsloc->locations)
424 for (i=0; i < fsloc->locations_count; i++) {
425 /* colon separated host list */
427 len = qword_get(mesg, buf, PAGE_SIZE);
431 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
432 if (!fsloc->locations[i].hosts)
435 /* slash separated path component list */
436 len = qword_get(mesg, buf, PAGE_SIZE);
440 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
441 if (!fsloc->locations[i].path)
445 err = get_int(mesg, &migrated);
449 if (migrated < 0 || migrated > 1)
451 fsloc->migrated = migrated;
454 nfsd4_fslocs_free(fsloc);
458 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
460 struct exp_flavor_info *f;
464 /* more than one secinfo */
465 if (exp->ex_nflavors)
468 err = get_uint(mesg, &listsize);
471 if (listsize > MAX_SECINFO_LIST)
474 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
475 err = get_uint(mesg, &f->pseudoflavor);
479 * XXX: It would be nice to also check whether this
480 * pseudoflavor is supported, so we can discover the
481 * problem at export time instead of when a client fails
484 err = get_uint(mesg, &f->flags);
487 /* Only some flags are allowed to differ between flavors: */
488 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
491 exp->ex_nflavors = listsize;
495 #else /* CONFIG_NFSD_V4 */
497 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
499 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
503 uuid_parse(char **mesg, char *buf, unsigned char **puuid)
507 /* more than one uuid */
511 /* expect a 16 byte uuid encoded as \xXXXX... */
512 len = qword_get(mesg, buf, PAGE_SIZE);
513 if (len != EX_UUID_LEN)
516 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
523 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
525 /* client path expiry [flags anonuid anongid fsid] */
529 struct auth_domain *dom = NULL;
530 struct svc_export exp = {}, *expp;
533 if (mesg[mlen-1] != '\n')
537 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
543 len = qword_get(&mesg, buf, PAGE_SIZE);
548 dom = auth_domain_find(buf);
554 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
557 err = kern_path(buf, 0, &exp.ex_path);
563 exp.ex_devid_map = NULL;
567 exp.h.expiry_time = get_expiry(&mesg);
568 if (exp.h.expiry_time == 0)
572 err = get_int(&mesg, &an_int);
573 if (err == -ENOENT) {
575 set_bit(CACHE_NEGATIVE, &exp.h.flags);
577 if (err || an_int < 0)
579 exp.ex_flags= an_int;
582 err = get_int(&mesg, &an_int);
585 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
588 err = get_int(&mesg, &an_int);
591 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
594 err = get_int(&mesg, &an_int);
597 exp.ex_fsid = an_int;
599 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
600 if (strcmp(buf, "fsloc") == 0)
601 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
602 else if (strcmp(buf, "uuid") == 0)
603 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
604 else if (strcmp(buf, "secinfo") == 0)
605 err = secinfo_parse(&mesg, buf, &exp);
607 /* quietly ignore unknown words and anything
608 * following. Newer user-space can try to set
609 * new values, then see what the result was.
616 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
621 * No point caching this if it would immediately expire.
622 * Also, this protects exportfs's dummy export from the
623 * anon_uid/anon_gid checks:
625 if (exp.h.expiry_time < seconds_since_boot())
628 * For some reason exportfs has been passing down an
629 * invalid (-1) uid & gid on the "dummy" export which it
630 * uses to test export support. To make sure exportfs
631 * sees errors from check_export we therefore need to
632 * delay these checks till after check_export:
635 if (!uid_valid(exp.ex_anon_uid))
637 if (!gid_valid(exp.ex_anon_gid))
641 nfsd4_setup_layout_type(&exp);
644 expp = svc_export_lookup(&exp);
646 expp = svc_export_update(&exp, expp);
655 nfsd4_fslocs_free(&exp.ex_fslocs);
658 path_put(&exp.ex_path);
660 auth_domain_put(dom);
666 static void exp_flags(struct seq_file *m, int flag, int fsid,
667 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
668 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
670 static int svc_export_show(struct seq_file *m,
671 struct cache_detail *cd,
672 struct cache_head *h)
674 struct svc_export *exp ;
677 seq_puts(m, "#path domain(flags)\n");
680 exp = container_of(h, struct svc_export, h);
681 seq_path(m, &exp->ex_path, " \t\n\\");
683 seq_escape(m, exp->ex_client->name, " \t\n\\");
685 if (test_bit(CACHE_VALID, &h->flags) &&
686 !test_bit(CACHE_NEGATIVE, &h->flags)) {
687 exp_flags(m, exp->ex_flags, exp->ex_fsid,
688 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
691 seq_puts(m, ",uuid=");
692 for (i = 0; i < EX_UUID_LEN; i++) {
695 seq_printf(m, "%02x", exp->ex_uuid[i]);
698 show_secinfo(m, exp);
703 static int svc_export_match(struct cache_head *a, struct cache_head *b)
705 struct svc_export *orig = container_of(a, struct svc_export, h);
706 struct svc_export *new = container_of(b, struct svc_export, h);
707 return orig->ex_client == new->ex_client &&
708 path_equal(&orig->ex_path, &new->ex_path);
711 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
713 struct svc_export *new = container_of(cnew, struct svc_export, h);
714 struct svc_export *item = container_of(citem, struct svc_export, h);
716 kref_get(&item->ex_client->ref);
717 new->ex_client = item->ex_client;
718 new->ex_path = item->ex_path;
719 path_get(&item->ex_path);
720 new->ex_fslocs.locations = NULL;
721 new->ex_fslocs.locations_count = 0;
722 new->ex_fslocs.migrated = 0;
723 new->ex_layout_type = 0;
728 static void export_update(struct cache_head *cnew, struct cache_head *citem)
730 struct svc_export *new = container_of(cnew, struct svc_export, h);
731 struct svc_export *item = container_of(citem, struct svc_export, h);
734 new->ex_flags = item->ex_flags;
735 new->ex_anon_uid = item->ex_anon_uid;
736 new->ex_anon_gid = item->ex_anon_gid;
737 new->ex_fsid = item->ex_fsid;
738 new->ex_devid_map = item->ex_devid_map;
739 item->ex_devid_map = NULL;
740 new->ex_uuid = item->ex_uuid;
741 item->ex_uuid = NULL;
742 new->ex_fslocs.locations = item->ex_fslocs.locations;
743 item->ex_fslocs.locations = NULL;
744 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
745 item->ex_fslocs.locations_count = 0;
746 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
747 item->ex_fslocs.migrated = 0;
748 new->ex_layout_type = item->ex_layout_type;
749 new->ex_nflavors = item->ex_nflavors;
750 for (i = 0; i < MAX_SECINFO_LIST; i++) {
751 new->ex_flavors[i] = item->ex_flavors[i];
755 static struct cache_head *svc_export_alloc(void)
757 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
764 static struct cache_detail svc_export_cache_template = {
765 .owner = THIS_MODULE,
766 .hash_size = EXPORT_HASHMAX,
767 .name = "nfsd.export",
768 .cache_put = svc_export_put,
769 .cache_request = svc_export_request,
770 .cache_parse = svc_export_parse,
771 .cache_show = svc_export_show,
772 .match = svc_export_match,
773 .init = svc_export_init,
774 .update = export_update,
775 .alloc = svc_export_alloc,
779 svc_export_hash(struct svc_export *exp)
783 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
784 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
785 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
789 static struct svc_export *
790 svc_export_lookup(struct svc_export *exp)
792 struct cache_head *ch;
793 int hash = svc_export_hash(exp);
795 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
797 return container_of(ch, struct svc_export, h);
802 static struct svc_export *
803 svc_export_update(struct svc_export *new, struct svc_export *old)
805 struct cache_head *ch;
806 int hash = svc_export_hash(old);
808 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
810 return container_of(ch, struct svc_export, h);
816 static struct svc_expkey *
817 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
818 u32 *fsidv, struct cache_req *reqp)
820 struct svc_expkey key, *ek;
824 return ERR_PTR(-ENOENT);
827 key.ek_fsidtype = fsid_type;
828 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
830 ek = svc_expkey_lookup(cd, &key);
832 return ERR_PTR(-ENOMEM);
833 err = cache_check(cd, &ek->h, reqp);
839 static struct svc_export *
840 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
841 const struct path *path, struct cache_req *reqp)
843 struct svc_export *exp, key;
847 return ERR_PTR(-ENOENT);
853 exp = svc_export_lookup(&key);
855 return ERR_PTR(-ENOMEM);
856 err = cache_check(cd, &exp->h, reqp);
863 * Find the export entry for a given dentry.
865 static struct svc_export *
866 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
868 struct dentry *saved = dget(path->dentry);
869 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
871 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
872 struct dentry *parent = dget_parent(path->dentry);
874 path->dentry = parent;
875 exp = exp_get_by_name(cd, clp, path, NULL);
878 path->dentry = saved;
885 * Obtain the root fh on behalf of a client.
886 * This could be done in user space, but I feel that it adds some safety
887 * since its harder to fool a kernel module than a user space program.
890 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
891 struct knfsd_fh *f, int maxsize)
893 struct svc_export *exp;
898 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
899 struct cache_detail *cd = nn->svc_export_cache;
902 /* NB: we probably ought to check that it's NUL-terminated */
903 if (kern_path(name, 0, &path)) {
904 printk("nfsd: exp_rootfh path not found %s", name);
907 inode = d_inode(path.dentry);
909 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
910 name, path.dentry, clp->name,
911 inode->i_sb->s_id, inode->i_ino);
912 exp = exp_parent(cd, clp, &path);
919 * fh must be initialized before calling fh_compose
921 fh_init(&fh, maxsize);
922 if (fh_compose(&fh, exp, path.dentry, NULL))
926 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
934 static struct svc_export *exp_find(struct cache_detail *cd,
935 struct auth_domain *clp, int fsid_type,
936 u32 *fsidv, struct cache_req *reqp)
938 struct svc_export *exp;
939 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
940 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
944 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
945 cache_put(&ek->h, nn->svc_expkey_cache);
948 return ERR_CAST(exp);
952 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
954 struct exp_flavor_info *f;
955 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
957 /* legacy gss-only clients are always OK: */
958 if (exp->ex_client == rqstp->rq_gssclient)
960 /* ip-address based client; check sec= export option: */
961 for (f = exp->ex_flavors; f < end; f++) {
962 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
965 /* defaults in absence of sec= options: */
966 if (exp->ex_nflavors == 0) {
967 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
968 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
971 return nfserr_wrongsec;
975 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
976 * auth_unix client) if it's available and has secinfo information;
977 * otherwise, will try to use rq_gssclient.
979 * Called from functions that handle requests; functions that do work on
980 * behalf of mountd are passed a single client name to use, and should
981 * use exp_get_by_name() or exp_find().
984 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
986 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
987 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
988 struct cache_detail *cd = nn->svc_export_cache;
990 if (rqstp->rq_client == NULL)
993 /* First try the auth_unix client: */
994 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
995 if (PTR_ERR(exp) == -ENOENT)
999 /* If it has secinfo, assume there are no gss/... clients */
1000 if (exp->ex_nflavors > 0)
1003 /* Otherwise, try falling back on gss client */
1004 if (rqstp->rq_gssclient == NULL)
1006 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1007 if (PTR_ERR(gssexp) == -ENOENT)
1015 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1017 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1018 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1019 struct cache_detail *cd = nn->svc_export_cache;
1021 if (rqstp->rq_client == NULL)
1024 /* First try the auth_unix client: */
1025 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1026 fsidv, &rqstp->rq_chandle);
1027 if (PTR_ERR(exp) == -ENOENT)
1031 /* If it has secinfo, assume there are no gss/... clients */
1032 if (exp->ex_nflavors > 0)
1035 /* Otherwise, try falling back on gss client */
1036 if (rqstp->rq_gssclient == NULL)
1038 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1039 &rqstp->rq_chandle);
1040 if (PTR_ERR(gssexp) == -ENOENT)
1048 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1050 struct dentry *saved = dget(path->dentry);
1051 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1053 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1054 struct dentry *parent = dget_parent(path->dentry);
1056 path->dentry = parent;
1057 exp = rqst_exp_get_by_name(rqstp, path);
1060 path->dentry = saved;
1064 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1068 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1070 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1074 * Called when we need the filehandle for the root of the pseudofs,
1075 * for a given NFSv4 client. The root is defined to be the
1076 * export point with fsid==0
1079 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1081 struct svc_export *exp;
1084 exp = rqst_find_fsidzero_export(rqstp);
1086 return nfserrno(PTR_ERR(exp));
1087 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1092 static struct flags {
1096 { NFSEXP_READONLY, {"ro", "rw"}},
1097 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1098 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1099 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1100 { NFSEXP_ASYNC, {"async", "sync"}},
1101 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1102 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1103 { NFSEXP_NOHIDE, {"nohide", ""}},
1104 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1105 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1106 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1107 { NFSEXP_V4ROOT, {"v4root", ""}},
1108 { NFSEXP_PNFS, {"pnfs", ""}},
1112 static void show_expflags(struct seq_file *m, int flags, int mask)
1115 int state, first = 0;
1117 for (flg = expflags; flg->flag; flg++) {
1118 if (flg->flag & ~mask)
1120 state = (flg->flag & flags) ? 0 : 1;
1121 if (*flg->name[state])
1122 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1126 static void show_secinfo_flags(struct seq_file *m, int flags)
1129 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1132 static bool secinfo_flags_equal(int f, int g)
1134 f &= NFSEXP_SECINFO_FLAGS;
1135 g &= NFSEXP_SECINFO_FLAGS;
1139 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1143 flags = (*fp)->flags;
1144 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1146 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1147 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1153 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1155 struct exp_flavor_info *f;
1156 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1159 if (exp->ex_nflavors == 0)
1161 f = exp->ex_flavors;
1162 flags = show_secinfo_run(m, &f, end);
1163 if (!secinfo_flags_equal(flags, exp->ex_flags))
1164 show_secinfo_flags(m, flags);
1166 flags = show_secinfo_run(m, &f, end);
1167 show_secinfo_flags(m, flags);
1171 static void exp_flags(struct seq_file *m, int flag, int fsid,
1172 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1174 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1175 if (flag & NFSEXP_FSID)
1176 seq_printf(m, ",fsid=%d", fsid);
1177 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1178 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1179 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1180 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1181 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1182 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1183 if (fsloc && fsloc->locations_count > 0) {
1184 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1187 seq_printf(m, ",%s=", loctype);
1188 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1190 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1191 for (i = 1; i < fsloc->locations_count; i++) {
1193 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1195 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1200 static int e_show(struct seq_file *m, void *p)
1202 struct cache_head *cp = p;
1203 struct svc_export *exp = container_of(cp, struct svc_export, h);
1204 struct cache_detail *cd = m->private;
1206 if (p == SEQ_START_TOKEN) {
1207 seq_puts(m, "# Version 1.1\n");
1208 seq_puts(m, "# Path Client(Flags) # IPs\n");
1213 if (cache_check(cd, &exp->h, NULL))
1216 return svc_export_show(m, cd, cp);
1219 const struct seq_operations nfs_exports_op = {
1220 .start = cache_seq_start,
1221 .next = cache_seq_next,
1222 .stop = cache_seq_stop,
1227 * Initialize the exports module.
1230 nfsd_export_init(struct net *net)
1233 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1235 dprintk("nfsd: initializing export module (net: %p).\n", net);
1237 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1238 if (IS_ERR(nn->svc_export_cache))
1239 return PTR_ERR(nn->svc_export_cache);
1240 rv = cache_register_net(nn->svc_export_cache, net);
1242 goto destroy_export_cache;
1244 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1245 if (IS_ERR(nn->svc_expkey_cache)) {
1246 rv = PTR_ERR(nn->svc_expkey_cache);
1247 goto unregister_export_cache;
1249 rv = cache_register_net(nn->svc_expkey_cache, net);
1251 goto destroy_expkey_cache;
1254 destroy_expkey_cache:
1255 cache_destroy_net(nn->svc_expkey_cache, net);
1256 unregister_export_cache:
1257 cache_unregister_net(nn->svc_export_cache, net);
1258 destroy_export_cache:
1259 cache_destroy_net(nn->svc_export_cache, net);
1264 * Flush exports table - called when last nfsd thread is killed
1267 nfsd_export_flush(struct net *net)
1269 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1271 cache_purge(nn->svc_expkey_cache);
1272 cache_purge(nn->svc_export_cache);
1276 * Shutdown the exports module.
1279 nfsd_export_shutdown(struct net *net)
1281 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1283 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1285 cache_unregister_net(nn->svc_expkey_cache, net);
1286 cache_unregister_net(nn->svc_export_cache, net);
1287 cache_destroy_net(nn->svc_expkey_cache, net);
1288 cache_destroy_net(nn->svc_export_cache, net);
1289 svcauth_unix_purge(net);
1291 dprintk("nfsd: export shutdown complete (net: %p).\n", net);