arm: Add devicetree fixup machine function
[linux/fpc-iii.git] / fs / nfsd / export.c
blob13b85f94d9e25e052fed8edf83095950a8b6927e
1 /*
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>
20 #include "nfsd.h"
21 #include "nfsfh.h"
22 #include "netns.h"
24 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27 * We have two caches.
28 * One maps client+vfsmnt+dentry to export options - the export map
29 * The other maps client+filehandle-fragment to export options. - the expkey map
31 * The export options are actually stored in the first map, and the
32 * second map contains a reference to the entry in the first map.
35 #define EXPKEY_HASHBITS 8
36 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
37 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
39 static void expkey_put(struct kref *ref)
41 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
43 if (test_bit(CACHE_VALID, &key->h.flags) &&
44 !test_bit(CACHE_NEGATIVE, &key->h.flags))
45 path_put(&key->ek_path);
46 auth_domain_put(key->ek_client);
47 kfree(key);
50 static void expkey_request(struct cache_detail *cd,
51 struct cache_head *h,
52 char **bpp, int *blen)
54 /* client fsidtype \xfsid */
55 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
56 char type[5];
58 qword_add(bpp, blen, ek->ek_client->name);
59 snprintf(type, 5, "%d", ek->ek_fsidtype);
60 qword_add(bpp, blen, type);
61 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
62 (*bpp)[-1] = '\n';
65 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
66 struct svc_expkey *old);
67 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
69 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
71 /* client fsidtype fsid expiry [path] */
72 char *buf;
73 int len;
74 struct auth_domain *dom = NULL;
75 int err;
76 int fsidtype;
77 char *ep;
78 struct svc_expkey key;
79 struct svc_expkey *ek = NULL;
81 if (mesg[mlen - 1] != '\n')
82 return -EINVAL;
83 mesg[mlen-1] = 0;
85 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
86 err = -ENOMEM;
87 if (!buf)
88 goto out;
90 err = -EINVAL;
91 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
92 goto out;
94 err = -ENOENT;
95 dom = auth_domain_find(buf);
96 if (!dom)
97 goto out;
98 dprintk("found domain %s\n", buf);
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103 fsidtype = simple_strtoul(buf, &ep, 10);
104 if (*ep)
105 goto out;
106 dprintk("found fsidtype %d\n", fsidtype);
107 if (key_len(fsidtype)==0) /* invalid type */
108 goto out;
109 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
110 goto out;
111 dprintk("found fsid length %d\n", len);
112 if (len != key_len(fsidtype))
113 goto out;
115 /* OK, we seem to have a valid key */
116 key.h.flags = 0;
117 key.h.expiry_time = get_expiry(&mesg);
118 if (key.h.expiry_time == 0)
119 goto out;
121 key.ek_client = dom;
122 key.ek_fsidtype = fsidtype;
123 memcpy(key.ek_fsid, buf, len);
125 ek = svc_expkey_lookup(cd, &key);
126 err = -ENOMEM;
127 if (!ek)
128 goto out;
130 /* now we want a pathname, or empty meaning NEGATIVE */
131 err = -EINVAL;
132 len = qword_get(&mesg, buf, PAGE_SIZE);
133 if (len < 0)
134 goto out;
135 dprintk("Path seems to be <%s>\n", buf);
136 err = 0;
137 if (len == 0) {
138 set_bit(CACHE_NEGATIVE, &key.h.flags);
139 ek = svc_expkey_update(cd, &key, ek);
140 if (!ek)
141 err = -ENOMEM;
142 } else {
143 err = kern_path(buf, 0, &key.ek_path);
144 if (err)
145 goto out;
147 dprintk("Found the path %s\n", buf);
149 ek = svc_expkey_update(cd, &key, ek);
150 if (!ek)
151 err = -ENOMEM;
152 path_put(&key.ek_path);
154 cache_flush();
155 out:
156 if (ek)
157 cache_put(&ek->h, cd);
158 if (dom)
159 auth_domain_put(dom);
160 kfree(buf);
161 return err;
164 static int expkey_show(struct seq_file *m,
165 struct cache_detail *cd,
166 struct cache_head *h)
168 struct svc_expkey *ek ;
169 int i;
171 if (h ==NULL) {
172 seq_puts(m, "#domain fsidtype fsid [path]\n");
173 return 0;
175 ek = container_of(h, struct svc_expkey, h);
176 seq_printf(m, "%s %d 0x", ek->ek_client->name,
177 ek->ek_fsidtype);
178 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
179 seq_printf(m, "%08x", ek->ek_fsid[i]);
180 if (test_bit(CACHE_VALID, &h->flags) &&
181 !test_bit(CACHE_NEGATIVE, &h->flags)) {
182 seq_printf(m, " ");
183 seq_path(m, &ek->ek_path, "\\ \t\n");
185 seq_printf(m, "\n");
186 return 0;
189 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
191 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
192 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
194 if (orig->ek_fsidtype != new->ek_fsidtype ||
195 orig->ek_client != new->ek_client ||
196 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
197 return 0;
198 return 1;
201 static inline void expkey_init(struct cache_head *cnew,
202 struct cache_head *citem)
204 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
205 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
207 kref_get(&item->ek_client->ref);
208 new->ek_client = item->ek_client;
209 new->ek_fsidtype = item->ek_fsidtype;
211 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
214 static inline void expkey_update(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 new->ek_path = item->ek_path;
221 path_get(&item->ek_path);
224 static struct cache_head *expkey_alloc(void)
226 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
227 if (i)
228 return &i->h;
229 else
230 return NULL;
233 static struct cache_detail svc_expkey_cache_template = {
234 .owner = THIS_MODULE,
235 .hash_size = EXPKEY_HASHMAX,
236 .name = "nfsd.fh",
237 .cache_put = expkey_put,
238 .cache_request = expkey_request,
239 .cache_parse = expkey_parse,
240 .cache_show = expkey_show,
241 .match = expkey_match,
242 .init = expkey_init,
243 .update = expkey_update,
244 .alloc = expkey_alloc,
247 static int
248 svc_expkey_hash(struct svc_expkey *item)
250 int hash = item->ek_fsidtype;
251 char * cp = (char*)item->ek_fsid;
252 int len = key_len(item->ek_fsidtype);
254 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
255 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
256 hash &= EXPKEY_HASHMASK;
257 return hash;
260 static struct svc_expkey *
261 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
263 struct cache_head *ch;
264 int hash = svc_expkey_hash(item);
266 ch = sunrpc_cache_lookup(cd, &item->h, hash);
267 if (ch)
268 return container_of(ch, struct svc_expkey, h);
269 else
270 return NULL;
273 static struct svc_expkey *
274 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
275 struct svc_expkey *old)
277 struct cache_head *ch;
278 int hash = svc_expkey_hash(new);
280 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
281 if (ch)
282 return container_of(ch, struct svc_expkey, h);
283 else
284 return NULL;
288 #define EXPORT_HASHBITS 8
289 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
291 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
293 struct nfsd4_fs_location *locations = fsloc->locations;
294 int i;
296 if (!locations)
297 return;
299 for (i = 0; i < fsloc->locations_count; i++) {
300 kfree(locations[i].path);
301 kfree(locations[i].hosts);
304 kfree(locations);
305 fsloc->locations = NULL;
308 static void svc_export_put(struct kref *ref)
310 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
311 path_put(&exp->ex_path);
312 auth_domain_put(exp->ex_client);
313 nfsd4_fslocs_free(&exp->ex_fslocs);
314 kfree(exp->ex_uuid);
315 kfree(exp);
318 static void svc_export_request(struct cache_detail *cd,
319 struct cache_head *h,
320 char **bpp, int *blen)
322 /* client path */
323 struct svc_export *exp = container_of(h, struct svc_export, h);
324 char *pth;
326 qword_add(bpp, blen, exp->ex_client->name);
327 pth = d_path(&exp->ex_path, *bpp, *blen);
328 if (IS_ERR(pth)) {
329 /* is this correct? */
330 (*bpp)[0] = '\n';
331 return;
333 qword_add(bpp, blen, pth);
334 (*bpp)[-1] = '\n';
337 static struct svc_export *svc_export_update(struct svc_export *new,
338 struct svc_export *old);
339 static struct svc_export *svc_export_lookup(struct svc_export *);
341 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
345 * We currently export only dirs, regular files, and (for v4
346 * pseudoroot) symlinks.
348 if (!S_ISDIR(inode->i_mode) &&
349 !S_ISLNK(inode->i_mode) &&
350 !S_ISREG(inode->i_mode))
351 return -ENOTDIR;
354 * Mountd should never pass down a writeable V4ROOT export, but,
355 * just to make sure:
357 if (*flags & NFSEXP_V4ROOT)
358 *flags |= NFSEXP_READONLY;
360 /* There are two requirements on a filesystem to be exportable.
361 * 1: We must be able to identify the filesystem from a number.
362 * either a device number (so FS_REQUIRES_DEV needed)
363 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
364 * 2: We must be able to find an inode from a filehandle.
365 * This means that s_export_op must be set.
367 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
368 !(*flags & NFSEXP_FSID) &&
369 uuid == NULL) {
370 dprintk("exp_export: export of non-dev fs without fsid\n");
371 return -EINVAL;
374 if (!inode->i_sb->s_export_op ||
375 !inode->i_sb->s_export_op->fh_to_dentry) {
376 dprintk("exp_export: export of invalid fs type.\n");
377 return -EINVAL;
380 return 0;
384 #ifdef CONFIG_NFSD_V4
386 static int
387 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389 int len;
390 int migrated, i, err;
392 /* more than one fsloc */
393 if (fsloc->locations)
394 return -EINVAL;
396 /* listsize */
397 err = get_uint(mesg, &fsloc->locations_count);
398 if (err)
399 return err;
400 if (fsloc->locations_count > MAX_FS_LOCATIONS)
401 return -EINVAL;
402 if (fsloc->locations_count == 0)
403 return 0;
405 fsloc->locations = kzalloc(fsloc->locations_count
406 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
407 if (!fsloc->locations)
408 return -ENOMEM;
409 for (i=0; i < fsloc->locations_count; i++) {
410 /* colon separated host list */
411 err = -EINVAL;
412 len = qword_get(mesg, buf, PAGE_SIZE);
413 if (len <= 0)
414 goto out_free_all;
415 err = -ENOMEM;
416 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
417 if (!fsloc->locations[i].hosts)
418 goto out_free_all;
419 err = -EINVAL;
420 /* slash separated path component list */
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].path)
427 goto out_free_all;
429 /* migrated */
430 err = get_int(mesg, &migrated);
431 if (err)
432 goto out_free_all;
433 err = -EINVAL;
434 if (migrated < 0 || migrated > 1)
435 goto out_free_all;
436 fsloc->migrated = migrated;
437 return 0;
438 out_free_all:
439 nfsd4_fslocs_free(fsloc);
440 return err;
443 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
445 struct exp_flavor_info *f;
446 u32 listsize;
447 int err;
449 /* more than one secinfo */
450 if (exp->ex_nflavors)
451 return -EINVAL;
453 err = get_uint(mesg, &listsize);
454 if (err)
455 return err;
456 if (listsize > MAX_SECINFO_LIST)
457 return -EINVAL;
459 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
460 err = get_uint(mesg, &f->pseudoflavor);
461 if (err)
462 return err;
464 * XXX: It would be nice to also check whether this
465 * pseudoflavor is supported, so we can discover the
466 * problem at export time instead of when a client fails
467 * to authenticate.
469 err = get_uint(mesg, &f->flags);
470 if (err)
471 return err;
472 /* Only some flags are allowed to differ between flavors: */
473 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
474 return -EINVAL;
476 exp->ex_nflavors = listsize;
477 return 0;
480 #else /* CONFIG_NFSD_V4 */
481 static inline int
482 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
483 static inline int
484 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
485 #endif
487 static inline int
488 uuid_parse(char **mesg, char *buf, unsigned char **puuid)
490 int len;
492 /* more than one uuid */
493 if (*puuid)
494 return -EINVAL;
496 /* expect a 16 byte uuid encoded as \xXXXX... */
497 len = qword_get(mesg, buf, PAGE_SIZE);
498 if (len != EX_UUID_LEN)
499 return -EINVAL;
501 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
502 if (*puuid == NULL)
503 return -ENOMEM;
505 return 0;
508 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
510 /* client path expiry [flags anonuid anongid fsid] */
511 char *buf;
512 int len;
513 int err;
514 struct auth_domain *dom = NULL;
515 struct svc_export exp = {}, *expp;
516 int an_int;
518 if (mesg[mlen-1] != '\n')
519 return -EINVAL;
520 mesg[mlen-1] = 0;
522 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
523 if (!buf)
524 return -ENOMEM;
526 /* client */
527 err = -EINVAL;
528 len = qword_get(&mesg, buf, PAGE_SIZE);
529 if (len <= 0)
530 goto out;
532 err = -ENOENT;
533 dom = auth_domain_find(buf);
534 if (!dom)
535 goto out;
537 /* path */
538 err = -EINVAL;
539 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
540 goto out1;
542 err = kern_path(buf, 0, &exp.ex_path);
543 if (err)
544 goto out1;
546 exp.ex_client = dom;
547 exp.cd = cd;
549 /* expiry */
550 err = -EINVAL;
551 exp.h.expiry_time = get_expiry(&mesg);
552 if (exp.h.expiry_time == 0)
553 goto out3;
555 /* flags */
556 err = get_int(&mesg, &an_int);
557 if (err == -ENOENT) {
558 err = 0;
559 set_bit(CACHE_NEGATIVE, &exp.h.flags);
560 } else {
561 if (err || an_int < 0)
562 goto out3;
563 exp.ex_flags= an_int;
565 /* anon uid */
566 err = get_int(&mesg, &an_int);
567 if (err)
568 goto out3;
569 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
571 /* anon gid */
572 err = get_int(&mesg, &an_int);
573 if (err)
574 goto out3;
575 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
577 /* fsid */
578 err = get_int(&mesg, &an_int);
579 if (err)
580 goto out3;
581 exp.ex_fsid = an_int;
583 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
584 if (strcmp(buf, "fsloc") == 0)
585 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
586 else if (strcmp(buf, "uuid") == 0)
587 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
588 else if (strcmp(buf, "secinfo") == 0)
589 err = secinfo_parse(&mesg, buf, &exp);
590 else
591 /* quietly ignore unknown words and anything
592 * following. Newer user-space can try to set
593 * new values, then see what the result was.
595 break;
596 if (err)
597 goto out4;
600 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
601 exp.ex_uuid);
602 if (err)
603 goto out4;
605 * No point caching this if it would immediately expire.
606 * Also, this protects exportfs's dummy export from the
607 * anon_uid/anon_gid checks:
609 if (exp.h.expiry_time < seconds_since_boot())
610 goto out4;
612 * For some reason exportfs has been passing down an
613 * invalid (-1) uid & gid on the "dummy" export which it
614 * uses to test export support. To make sure exportfs
615 * sees errors from check_export we therefore need to
616 * delay these checks till after check_export:
618 err = -EINVAL;
619 if (!uid_valid(exp.ex_anon_uid))
620 goto out4;
621 if (!gid_valid(exp.ex_anon_gid))
622 goto out4;
623 err = 0;
626 expp = svc_export_lookup(&exp);
627 if (expp)
628 expp = svc_export_update(&exp, expp);
629 else
630 err = -ENOMEM;
631 cache_flush();
632 if (expp == NULL)
633 err = -ENOMEM;
634 else
635 exp_put(expp);
636 out4:
637 nfsd4_fslocs_free(&exp.ex_fslocs);
638 kfree(exp.ex_uuid);
639 out3:
640 path_put(&exp.ex_path);
641 out1:
642 auth_domain_put(dom);
643 out:
644 kfree(buf);
645 return err;
648 static void exp_flags(struct seq_file *m, int flag, int fsid,
649 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
650 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
652 static int svc_export_show(struct seq_file *m,
653 struct cache_detail *cd,
654 struct cache_head *h)
656 struct svc_export *exp ;
658 if (h ==NULL) {
659 seq_puts(m, "#path domain(flags)\n");
660 return 0;
662 exp = container_of(h, struct svc_export, h);
663 seq_path(m, &exp->ex_path, " \t\n\\");
664 seq_putc(m, '\t');
665 seq_escape(m, exp->ex_client->name, " \t\n\\");
666 seq_putc(m, '(');
667 if (test_bit(CACHE_VALID, &h->flags) &&
668 !test_bit(CACHE_NEGATIVE, &h->flags)) {
669 exp_flags(m, exp->ex_flags, exp->ex_fsid,
670 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
671 if (exp->ex_uuid) {
672 int i;
673 seq_puts(m, ",uuid=");
674 for (i = 0; i < EX_UUID_LEN; i++) {
675 if ((i&3) == 0 && i)
676 seq_putc(m, ':');
677 seq_printf(m, "%02x", exp->ex_uuid[i]);
680 show_secinfo(m, exp);
682 seq_puts(m, ")\n");
683 return 0;
685 static int svc_export_match(struct cache_head *a, struct cache_head *b)
687 struct svc_export *orig = container_of(a, struct svc_export, h);
688 struct svc_export *new = container_of(b, struct svc_export, h);
689 return orig->ex_client == new->ex_client &&
690 orig->ex_path.dentry == new->ex_path.dentry &&
691 orig->ex_path.mnt == new->ex_path.mnt;
694 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
696 struct svc_export *new = container_of(cnew, struct svc_export, h);
697 struct svc_export *item = container_of(citem, struct svc_export, h);
699 kref_get(&item->ex_client->ref);
700 new->ex_client = item->ex_client;
701 new->ex_path.dentry = dget(item->ex_path.dentry);
702 new->ex_path.mnt = mntget(item->ex_path.mnt);
703 new->ex_fslocs.locations = NULL;
704 new->ex_fslocs.locations_count = 0;
705 new->ex_fslocs.migrated = 0;
706 new->ex_uuid = NULL;
707 new->cd = item->cd;
710 static void export_update(struct cache_head *cnew, struct cache_head *citem)
712 struct svc_export *new = container_of(cnew, struct svc_export, h);
713 struct svc_export *item = container_of(citem, struct svc_export, h);
714 int i;
716 new->ex_flags = item->ex_flags;
717 new->ex_anon_uid = item->ex_anon_uid;
718 new->ex_anon_gid = item->ex_anon_gid;
719 new->ex_fsid = item->ex_fsid;
720 new->ex_uuid = item->ex_uuid;
721 item->ex_uuid = NULL;
722 new->ex_fslocs.locations = item->ex_fslocs.locations;
723 item->ex_fslocs.locations = NULL;
724 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
725 item->ex_fslocs.locations_count = 0;
726 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
727 item->ex_fslocs.migrated = 0;
728 new->ex_nflavors = item->ex_nflavors;
729 for (i = 0; i < MAX_SECINFO_LIST; i++) {
730 new->ex_flavors[i] = item->ex_flavors[i];
734 static struct cache_head *svc_export_alloc(void)
736 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
737 if (i)
738 return &i->h;
739 else
740 return NULL;
743 static struct cache_detail svc_export_cache_template = {
744 .owner = THIS_MODULE,
745 .hash_size = EXPORT_HASHMAX,
746 .name = "nfsd.export",
747 .cache_put = svc_export_put,
748 .cache_request = svc_export_request,
749 .cache_parse = svc_export_parse,
750 .cache_show = svc_export_show,
751 .match = svc_export_match,
752 .init = svc_export_init,
753 .update = export_update,
754 .alloc = svc_export_alloc,
757 static int
758 svc_export_hash(struct svc_export *exp)
760 int hash;
762 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
763 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
764 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
765 return hash;
768 static struct svc_export *
769 svc_export_lookup(struct svc_export *exp)
771 struct cache_head *ch;
772 int hash = svc_export_hash(exp);
774 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
775 if (ch)
776 return container_of(ch, struct svc_export, h);
777 else
778 return NULL;
781 static struct svc_export *
782 svc_export_update(struct svc_export *new, struct svc_export *old)
784 struct cache_head *ch;
785 int hash = svc_export_hash(old);
787 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
788 if (ch)
789 return container_of(ch, struct svc_export, h);
790 else
791 return NULL;
795 static struct svc_expkey *
796 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
797 u32 *fsidv, struct cache_req *reqp)
799 struct svc_expkey key, *ek;
800 int err;
802 if (!clp)
803 return ERR_PTR(-ENOENT);
805 key.ek_client = clp;
806 key.ek_fsidtype = fsid_type;
807 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
809 ek = svc_expkey_lookup(cd, &key);
810 if (ek == NULL)
811 return ERR_PTR(-ENOMEM);
812 err = cache_check(cd, &ek->h, reqp);
813 if (err)
814 return ERR_PTR(err);
815 return ek;
818 static struct svc_export *
819 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
820 const struct path *path, struct cache_req *reqp)
822 struct svc_export *exp, key;
823 int err;
825 if (!clp)
826 return ERR_PTR(-ENOENT);
828 key.ex_client = clp;
829 key.ex_path = *path;
830 key.cd = cd;
832 exp = svc_export_lookup(&key);
833 if (exp == NULL)
834 return ERR_PTR(-ENOMEM);
835 err = cache_check(cd, &exp->h, reqp);
836 if (err)
837 return ERR_PTR(err);
838 return exp;
842 * Find the export entry for a given dentry.
844 static struct svc_export *
845 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
847 struct dentry *saved = dget(path->dentry);
848 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
850 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
851 struct dentry *parent = dget_parent(path->dentry);
852 dput(path->dentry);
853 path->dentry = parent;
854 exp = exp_get_by_name(cd, clp, path, NULL);
856 dput(path->dentry);
857 path->dentry = saved;
858 return exp;
864 * Obtain the root fh on behalf of a client.
865 * This could be done in user space, but I feel that it adds some safety
866 * since its harder to fool a kernel module than a user space program.
869 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
870 struct knfsd_fh *f, int maxsize)
872 struct svc_export *exp;
873 struct path path;
874 struct inode *inode;
875 struct svc_fh fh;
876 int err;
877 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
878 struct cache_detail *cd = nn->svc_export_cache;
880 err = -EPERM;
881 /* NB: we probably ought to check that it's NUL-terminated */
882 if (kern_path(name, 0, &path)) {
883 printk("nfsd: exp_rootfh path not found %s", name);
884 return err;
886 inode = path.dentry->d_inode;
888 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
889 name, path.dentry, clp->name,
890 inode->i_sb->s_id, inode->i_ino);
891 exp = exp_parent(cd, clp, &path);
892 if (IS_ERR(exp)) {
893 err = PTR_ERR(exp);
894 goto out;
898 * fh must be initialized before calling fh_compose
900 fh_init(&fh, maxsize);
901 if (fh_compose(&fh, exp, path.dentry, NULL))
902 err = -EINVAL;
903 else
904 err = 0;
905 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
906 fh_put(&fh);
907 exp_put(exp);
908 out:
909 path_put(&path);
910 return err;
913 static struct svc_export *exp_find(struct cache_detail *cd,
914 struct auth_domain *clp, int fsid_type,
915 u32 *fsidv, struct cache_req *reqp)
917 struct svc_export *exp;
918 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
919 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
920 if (IS_ERR(ek))
921 return ERR_CAST(ek);
923 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
924 cache_put(&ek->h, nn->svc_expkey_cache);
926 if (IS_ERR(exp))
927 return ERR_CAST(exp);
928 return exp;
931 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
933 struct exp_flavor_info *f;
934 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
936 /* legacy gss-only clients are always OK: */
937 if (exp->ex_client == rqstp->rq_gssclient)
938 return 0;
939 /* ip-address based client; check sec= export option: */
940 for (f = exp->ex_flavors; f < end; f++) {
941 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
942 return 0;
944 /* defaults in absence of sec= options: */
945 if (exp->ex_nflavors == 0) {
946 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
947 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
948 return 0;
950 return nfserr_wrongsec;
954 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
955 * auth_unix client) if it's available and has secinfo information;
956 * otherwise, will try to use rq_gssclient.
958 * Called from functions that handle requests; functions that do work on
959 * behalf of mountd are passed a single client name to use, and should
960 * use exp_get_by_name() or exp_find().
962 struct svc_export *
963 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
965 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
966 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
967 struct cache_detail *cd = nn->svc_export_cache;
969 if (rqstp->rq_client == NULL)
970 goto gss;
972 /* First try the auth_unix client: */
973 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
974 if (PTR_ERR(exp) == -ENOENT)
975 goto gss;
976 if (IS_ERR(exp))
977 return exp;
978 /* If it has secinfo, assume there are no gss/... clients */
979 if (exp->ex_nflavors > 0)
980 return exp;
981 gss:
982 /* Otherwise, try falling back on gss client */
983 if (rqstp->rq_gssclient == NULL)
984 return exp;
985 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
986 if (PTR_ERR(gssexp) == -ENOENT)
987 return exp;
988 if (!IS_ERR(exp))
989 exp_put(exp);
990 return gssexp;
993 struct svc_export *
994 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
996 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
997 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
998 struct cache_detail *cd = nn->svc_export_cache;
1000 if (rqstp->rq_client == NULL)
1001 goto gss;
1003 /* First try the auth_unix client: */
1004 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1005 fsidv, &rqstp->rq_chandle);
1006 if (PTR_ERR(exp) == -ENOENT)
1007 goto gss;
1008 if (IS_ERR(exp))
1009 return exp;
1010 /* If it has secinfo, assume there are no gss/... clients */
1011 if (exp->ex_nflavors > 0)
1012 return exp;
1013 gss:
1014 /* Otherwise, try falling back on gss client */
1015 if (rqstp->rq_gssclient == NULL)
1016 return exp;
1017 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1018 &rqstp->rq_chandle);
1019 if (PTR_ERR(gssexp) == -ENOENT)
1020 return exp;
1021 if (!IS_ERR(exp))
1022 exp_put(exp);
1023 return gssexp;
1026 struct svc_export *
1027 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1029 struct dentry *saved = dget(path->dentry);
1030 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1032 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1033 struct dentry *parent = dget_parent(path->dentry);
1034 dput(path->dentry);
1035 path->dentry = parent;
1036 exp = rqst_exp_get_by_name(rqstp, path);
1038 dput(path->dentry);
1039 path->dentry = saved;
1040 return exp;
1043 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1045 u32 fsidv[2];
1047 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1049 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1053 * Called when we need the filehandle for the root of the pseudofs,
1054 * for a given NFSv4 client. The root is defined to be the
1055 * export point with fsid==0
1057 __be32
1058 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1060 struct svc_export *exp;
1061 __be32 rv;
1063 exp = rqst_find_fsidzero_export(rqstp);
1064 if (IS_ERR(exp))
1065 return nfserrno(PTR_ERR(exp));
1066 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1067 exp_put(exp);
1068 return rv;
1071 /* Iterator */
1073 static void *e_start(struct seq_file *m, loff_t *pos)
1074 __acquires(((struct cache_detail *)m->private)->hash_lock)
1076 loff_t n = *pos;
1077 unsigned hash, export;
1078 struct cache_head *ch;
1079 struct cache_detail *cd = m->private;
1080 struct cache_head **export_table = cd->hash_table;
1082 read_lock(&cd->hash_lock);
1083 if (!n--)
1084 return SEQ_START_TOKEN;
1085 hash = n >> 32;
1086 export = n & ((1LL<<32) - 1);
1089 for (ch=export_table[hash]; ch; ch=ch->next)
1090 if (!export--)
1091 return ch;
1092 n &= ~((1LL<<32) - 1);
1093 do {
1094 hash++;
1095 n += 1LL<<32;
1096 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1097 if (hash >= EXPORT_HASHMAX)
1098 return NULL;
1099 *pos = n+1;
1100 return export_table[hash];
1103 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1105 struct cache_head *ch = p;
1106 int hash = (*pos >> 32);
1107 struct cache_detail *cd = m->private;
1108 struct cache_head **export_table = cd->hash_table;
1110 if (p == SEQ_START_TOKEN)
1111 hash = 0;
1112 else if (ch->next == NULL) {
1113 hash++;
1114 *pos += 1LL<<32;
1115 } else {
1116 ++*pos;
1117 return ch->next;
1119 *pos &= ~((1LL<<32) - 1);
1120 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1121 hash++;
1122 *pos += 1LL<<32;
1124 if (hash >= EXPORT_HASHMAX)
1125 return NULL;
1126 ++*pos;
1127 return export_table[hash];
1130 static void e_stop(struct seq_file *m, void *p)
1131 __releases(((struct cache_detail *)m->private)->hash_lock)
1133 struct cache_detail *cd = m->private;
1135 read_unlock(&cd->hash_lock);
1138 static struct flags {
1139 int flag;
1140 char *name[2];
1141 } expflags[] = {
1142 { NFSEXP_READONLY, {"ro", "rw"}},
1143 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1144 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1145 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1146 { NFSEXP_ASYNC, {"async", "sync"}},
1147 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1148 { NFSEXP_NOHIDE, {"nohide", ""}},
1149 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1150 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1151 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1152 { NFSEXP_V4ROOT, {"v4root", ""}},
1153 { 0, {"", ""}}
1156 static void show_expflags(struct seq_file *m, int flags, int mask)
1158 struct flags *flg;
1159 int state, first = 0;
1161 for (flg = expflags; flg->flag; flg++) {
1162 if (flg->flag & ~mask)
1163 continue;
1164 state = (flg->flag & flags) ? 0 : 1;
1165 if (*flg->name[state])
1166 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1170 static void show_secinfo_flags(struct seq_file *m, int flags)
1172 seq_printf(m, ",");
1173 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1176 static bool secinfo_flags_equal(int f, int g)
1178 f &= NFSEXP_SECINFO_FLAGS;
1179 g &= NFSEXP_SECINFO_FLAGS;
1180 return f == g;
1183 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1185 int flags;
1187 flags = (*fp)->flags;
1188 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1189 (*fp)++;
1190 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1191 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1192 (*fp)++;
1194 return flags;
1197 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1199 struct exp_flavor_info *f;
1200 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1201 int flags;
1203 if (exp->ex_nflavors == 0)
1204 return;
1205 f = exp->ex_flavors;
1206 flags = show_secinfo_run(m, &f, end);
1207 if (!secinfo_flags_equal(flags, exp->ex_flags))
1208 show_secinfo_flags(m, flags);
1209 while (f != end) {
1210 flags = show_secinfo_run(m, &f, end);
1211 show_secinfo_flags(m, flags);
1215 static void exp_flags(struct seq_file *m, int flag, int fsid,
1216 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1218 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1219 if (flag & NFSEXP_FSID)
1220 seq_printf(m, ",fsid=%d", fsid);
1221 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1222 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1223 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1224 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1225 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1226 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1227 if (fsloc && fsloc->locations_count > 0) {
1228 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1229 int i;
1231 seq_printf(m, ",%s=", loctype);
1232 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1233 seq_putc(m, '@');
1234 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1235 for (i = 1; i < fsloc->locations_count; i++) {
1236 seq_putc(m, ';');
1237 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1238 seq_putc(m, '@');
1239 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1244 static int e_show(struct seq_file *m, void *p)
1246 struct cache_head *cp = p;
1247 struct svc_export *exp = container_of(cp, struct svc_export, h);
1248 struct cache_detail *cd = m->private;
1250 if (p == SEQ_START_TOKEN) {
1251 seq_puts(m, "# Version 1.1\n");
1252 seq_puts(m, "# Path Client(Flags) # IPs\n");
1253 return 0;
1256 cache_get(&exp->h);
1257 if (cache_check(cd, &exp->h, NULL))
1258 return 0;
1259 exp_put(exp);
1260 return svc_export_show(m, cd, cp);
1263 const struct seq_operations nfs_exports_op = {
1264 .start = e_start,
1265 .next = e_next,
1266 .stop = e_stop,
1267 .show = e_show,
1271 * Initialize the exports module.
1274 nfsd_export_init(struct net *net)
1276 int rv;
1277 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1279 dprintk("nfsd: initializing export module (net: %p).\n", net);
1281 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1282 if (IS_ERR(nn->svc_export_cache))
1283 return PTR_ERR(nn->svc_export_cache);
1284 rv = cache_register_net(nn->svc_export_cache, net);
1285 if (rv)
1286 goto destroy_export_cache;
1288 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1289 if (IS_ERR(nn->svc_expkey_cache)) {
1290 rv = PTR_ERR(nn->svc_expkey_cache);
1291 goto unregister_export_cache;
1293 rv = cache_register_net(nn->svc_expkey_cache, net);
1294 if (rv)
1295 goto destroy_expkey_cache;
1296 return 0;
1298 destroy_expkey_cache:
1299 cache_destroy_net(nn->svc_expkey_cache, net);
1300 unregister_export_cache:
1301 cache_unregister_net(nn->svc_export_cache, net);
1302 destroy_export_cache:
1303 cache_destroy_net(nn->svc_export_cache, net);
1304 return rv;
1308 * Flush exports table - called when last nfsd thread is killed
1310 void
1311 nfsd_export_flush(struct net *net)
1313 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1315 cache_purge(nn->svc_expkey_cache);
1316 cache_purge(nn->svc_export_cache);
1320 * Shutdown the exports module.
1322 void
1323 nfsd_export_shutdown(struct net *net)
1325 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1327 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1329 cache_unregister_net(nn->svc_expkey_cache, net);
1330 cache_unregister_net(nn->svc_export_cache, net);
1331 cache_destroy_net(nn->svc_expkey_cache, net);
1332 cache_destroy_net(nn->svc_export_cache, net);
1333 svcauth_unix_purge(net);
1335 dprintk("nfsd: export shutdown complete (net: %p).\n", net);