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media: cpia2_usb: drop bogus interface-release call
[linux/fpc-iii.git] / fs / nfsd / export.c
blob8ceb25a10ea0df002cae637d137d0f0e0d55a93b
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NFS exporting and validation.
4 *
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.
10 *
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
13 */
14
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>
20
21 #include "nfsd.h"
22 #include "nfsfh.h"
23 #include "netns.h"
24 #include "pnfs.h"
25
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28 /*
29 * We have two caches.
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
32 *
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.
35 */
36
37 #define EXPKEY_HASHBITS 8
38 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
39 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
40
41 static void expkey_put(struct kref *ref)
42 {
43 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
44
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);
49 kfree(key);
50 }
51
52 static void expkey_request(struct cache_detail *cd,
53 struct cache_head *h,
54 char **bpp, int *blen)
55 {
56 /* client fsidtype \xfsid */
57 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
58 char type[5];
59
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));
64 (*bpp)[-1] = '\n';
65 }
66
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 *);
70
71 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
72 {
73 /* client fsidtype fsid expiry [path] */
74 char *buf;
75 int len;
76 struct auth_domain *dom = NULL;
77 int err;
78 int fsidtype;
79 char *ep;
80 struct svc_expkey key;
81 struct svc_expkey *ek = NULL;
82
83 if (mesg[mlen - 1] != '\n')
84 return -EINVAL;
85 mesg[mlen-1] = 0;
86
87 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
88 err = -ENOMEM;
89 if (!buf)
90 goto out;
91
92 err = -EINVAL;
93 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
94 goto out;
95
96 err = -ENOENT;
97 dom = auth_domain_find(buf);
98 if (!dom)
99 goto out;
100 dprintk("found domain %s\n", buf);
101
102 err = -EINVAL;
103 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
104 goto out;
105 fsidtype = simple_strtoul(buf, &ep, 10);
106 if (*ep)
107 goto out;
108 dprintk("found fsidtype %d\n", fsidtype);
109 if (key_len(fsidtype)==0) /* invalid type */
110 goto out;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 dprintk("found fsid length %d\n", len);
114 if (len != key_len(fsidtype))
115 goto out;
116
117 /* OK, we seem to have a valid key */
118 key.h.flags = 0;
119 key.h.expiry_time = get_expiry(&mesg);
120 if (key.h.expiry_time == 0)
121 goto out;
122
123 key.ek_client = dom;
124 key.ek_fsidtype = fsidtype;
125 memcpy(key.ek_fsid, buf, len);
126
127 ek = svc_expkey_lookup(cd, &key);
128 err = -ENOMEM;
129 if (!ek)
130 goto out;
131
132 /* now we want a pathname, or empty meaning NEGATIVE */
133 err = -EINVAL;
134 len = qword_get(&mesg, buf, PAGE_SIZE);
135 if (len < 0)
136 goto out;
137 dprintk("Path seems to be <%s>\n", buf);
138 err = 0;
139 if (len == 0) {
140 set_bit(CACHE_NEGATIVE, &key.h.flags);
141 ek = svc_expkey_update(cd, &key, ek);
142 if (!ek)
143 err = -ENOMEM;
144 } else {
145 err = kern_path(buf, 0, &key.ek_path);
146 if (err)
147 goto out;
148
149 dprintk("Found the path %s\n", buf);
150
151 ek = svc_expkey_update(cd, &key, ek);
152 if (!ek)
153 err = -ENOMEM;
154 path_put(&key.ek_path);
155 }
156 cache_flush();
157 out:
158 if (ek)
159 cache_put(&ek->h, cd);
160 if (dom)
161 auth_domain_put(dom);
162 kfree(buf);
163 return err;
164 }
165
166 static int expkey_show(struct seq_file *m,
167 struct cache_detail *cd,
168 struct cache_head *h)
169 {
170 struct svc_expkey *ek ;
171 int i;
172
173 if (h ==NULL) {
174 seq_puts(m, "#domain fsidtype fsid [path]\n");
175 return 0;
176 }
177 ek = container_of(h, struct svc_expkey, h);
178 seq_printf(m, "%s %d 0x", ek->ek_client->name,
179 ek->ek_fsidtype);
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)) {
184 seq_printf(m, " ");
185 seq_path(m, &ek->ek_path, "\\ \t\n");
186 }
187 seq_printf(m, "\n");
188 return 0;
189 }
190
191 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
192 {
193 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
194 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
195
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)
199 return 0;
200 return 1;
201 }
202
203 static inline void expkey_init(struct cache_head *cnew,
204 struct cache_head *citem)
205 {
206 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
207 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
208
209 kref_get(&item->ek_client->ref);
210 new->ek_client = item->ek_client;
211 new->ek_fsidtype = item->ek_fsidtype;
212
213 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
214 }
215
216 static inline void expkey_update(struct cache_head *cnew,
217 struct cache_head *citem)
218 {
219 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
220 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
221
222 new->ek_path = item->ek_path;
223 path_get(&item->ek_path);
224 }
225
226 static struct cache_head *expkey_alloc(void)
227 {
228 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
229 if (i)
230 return &i->h;
231 else
232 return NULL;
233 }
234
235 static const struct cache_detail svc_expkey_cache_template = {
236 .owner = THIS_MODULE,
237 .hash_size = EXPKEY_HASHMAX,
238 .name = "nfsd.fh",
239 .cache_put = expkey_put,
240 .cache_request = expkey_request,
241 .cache_parse = expkey_parse,
242 .cache_show = expkey_show,
243 .match = expkey_match,
244 .init = expkey_init,
245 .update = expkey_update,
246 .alloc = expkey_alloc,
247 };
248
249 static int
250 svc_expkey_hash(struct svc_expkey *item)
251 {
252 int hash = item->ek_fsidtype;
253 char * cp = (char*)item->ek_fsid;
254 int len = key_len(item->ek_fsidtype);
255
256 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
257 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
258 hash &= EXPKEY_HASHMASK;
259 return hash;
260 }
261
262 static struct svc_expkey *
263 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
264 {
265 struct cache_head *ch;
266 int hash = svc_expkey_hash(item);
267
268 ch = sunrpc_cache_lookup(cd, &item->h, hash);
269 if (ch)
270 return container_of(ch, struct svc_expkey, h);
271 else
272 return NULL;
273 }
274
275 static struct svc_expkey *
276 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
277 struct svc_expkey *old)
278 {
279 struct cache_head *ch;
280 int hash = svc_expkey_hash(new);
281
282 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
283 if (ch)
284 return container_of(ch, struct svc_expkey, h);
285 else
286 return NULL;
287 }
288
289
290 #define EXPORT_HASHBITS 8
291 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
292
293 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
294 {
295 struct nfsd4_fs_location *locations = fsloc->locations;
296 int i;
297
298 if (!locations)
299 return;
300
301 for (i = 0; i < fsloc->locations_count; i++) {
302 kfree(locations[i].path);
303 kfree(locations[i].hosts);
304 }
305
306 kfree(locations);
307 fsloc->locations = NULL;
308 }
309
310 static void svc_export_put(struct kref *ref)
311 {
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);
316 kfree(exp->ex_uuid);
317 kfree(exp);
318 }
319
320 static void svc_export_request(struct cache_detail *cd,
321 struct cache_head *h,
322 char **bpp, int *blen)
323 {
324 /* client path */
325 struct svc_export *exp = container_of(h, struct svc_export, h);
326 char *pth;
327
328 qword_add(bpp, blen, exp->ex_client->name);
329 pth = d_path(&exp->ex_path, *bpp, *blen);
330 if (IS_ERR(pth)) {
331 /* is this correct? */
332 (*bpp)[0] = '\n';
333 return;
334 }
335 qword_add(bpp, blen, pth);
336 (*bpp)[-1] = '\n';
337 }
338
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 *);
342
343 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
344 {
345
346 /*
347 * We currently export only dirs, regular files, and (for v4
348 * pseudoroot) symlinks.
349 */
350 if (!S_ISDIR(inode->i_mode) &&
351 !S_ISLNK(inode->i_mode) &&
352 !S_ISREG(inode->i_mode))
353 return -ENOTDIR;
354
355 /*
356 * Mountd should never pass down a writeable V4ROOT export, but,
357 * just to make sure:
358 */
359 if (*flags & NFSEXP_V4ROOT)
360 *flags |= NFSEXP_READONLY;
361
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.
368 */
369 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
370 !(*flags & NFSEXP_FSID) &&
371 uuid == NULL) {
372 dprintk("exp_export: export of non-dev fs without fsid\n");
373 return -EINVAL;
374 }
375
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");
379 return -EINVAL;
380 }
381
382 return 0;
383
384 }
385
386 #ifdef CONFIG_NFSD_V4
387
388 static int
389 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
390 {
391 int len;
392 int migrated, i, err;
393
394 /* more than one fsloc */
395 if (fsloc->locations)
396 return -EINVAL;
397
398 /* listsize */
399 err = get_uint(mesg, &fsloc->locations_count);
400 if (err)
401 return err;
402 if (fsloc->locations_count > MAX_FS_LOCATIONS)
403 return -EINVAL;
404 if (fsloc->locations_count == 0)
405 return 0;
406
407 fsloc->locations = kzalloc(fsloc->locations_count
408 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
409 if (!fsloc->locations)
410 return -ENOMEM;
411 for (i=0; i < fsloc->locations_count; i++) {
412 /* colon separated host list */
413 err = -EINVAL;
414 len = qword_get(mesg, buf, PAGE_SIZE);
415 if (len <= 0)
416 goto out_free_all;
417 err = -ENOMEM;
418 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
419 if (!fsloc->locations[i].hosts)
420 goto out_free_all;
421 err = -EINVAL;
422 /* slash separated path component list */
423 len = qword_get(mesg, buf, PAGE_SIZE);
424 if (len <= 0)
425 goto out_free_all;
426 err = -ENOMEM;
427 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
428 if (!fsloc->locations[i].path)
429 goto out_free_all;
430 }
431 /* migrated */
432 err = get_int(mesg, &migrated);
433 if (err)
434 goto out_free_all;
435 err = -EINVAL;
436 if (migrated < 0 || migrated > 1)
437 goto out_free_all;
438 fsloc->migrated = migrated;
439 return 0;
440 out_free_all:
441 nfsd4_fslocs_free(fsloc);
442 return err;
443 }
444
445 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
446 {
447 struct exp_flavor_info *f;
448 u32 listsize;
449 int err;
450
451 /* more than one secinfo */
452 if (exp->ex_nflavors)
453 return -EINVAL;
454
455 err = get_uint(mesg, &listsize);
456 if (err)
457 return err;
458 if (listsize > MAX_SECINFO_LIST)
459 return -EINVAL;
460
461 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
462 err = get_uint(mesg, &f->pseudoflavor);
463 if (err)
464 return err;
465 /*
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
469 * to authenticate.
470 */
471 err = get_uint(mesg, &f->flags);
472 if (err)
473 return err;
474 /* Only some flags are allowed to differ between flavors: */
475 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
476 return -EINVAL;
477 }
478 exp->ex_nflavors = listsize;
479 return 0;
480 }
481
482 #else /* CONFIG_NFSD_V4 */
483 static inline int
484 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
485 static inline int
486 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
487 #endif
488
489 static inline int
490 nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
491 {
492 int len;
493
494 /* more than one uuid */
495 if (*puuid)
496 return -EINVAL;
497
498 /* expect a 16 byte uuid encoded as \xXXXX... */
499 len = qword_get(mesg, buf, PAGE_SIZE);
500 if (len != EX_UUID_LEN)
501 return -EINVAL;
502
503 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
504 if (*puuid == NULL)
505 return -ENOMEM;
506
507 return 0;
508 }
509
510 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
511 {
512 /* client path expiry [flags anonuid anongid fsid] */
513 char *buf;
514 int len;
515 int err;
516 struct auth_domain *dom = NULL;
517 struct svc_export exp = {}, *expp;
518 int an_int;
519
520 if (mesg[mlen-1] != '\n')
521 return -EINVAL;
522 mesg[mlen-1] = 0;
523
524 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
525 if (!buf)
526 return -ENOMEM;
527
528 /* client */
529 err = -EINVAL;
530 len = qword_get(&mesg, buf, PAGE_SIZE);
531 if (len <= 0)
532 goto out;
533
534 err = -ENOENT;
535 dom = auth_domain_find(buf);
536 if (!dom)
537 goto out;
538
539 /* path */
540 err = -EINVAL;
541 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
542 goto out1;
543
544 err = kern_path(buf, 0, &exp.ex_path);
545 if (err)
546 goto out1;
547
548 exp.ex_client = dom;
549 exp.cd = cd;
550 exp.ex_devid_map = NULL;
551
552 /* expiry */
553 err = -EINVAL;
554 exp.h.expiry_time = get_expiry(&mesg);
555 if (exp.h.expiry_time == 0)
556 goto out3;
557
558 /* flags */
559 err = get_int(&mesg, &an_int);
560 if (err == -ENOENT) {
561 err = 0;
562 set_bit(CACHE_NEGATIVE, &exp.h.flags);
563 } else {
564 if (err || an_int < 0)
565 goto out3;
566 exp.ex_flags= an_int;
567
568 /* anon uid */
569 err = get_int(&mesg, &an_int);
570 if (err)
571 goto out3;
572 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
573
574 /* anon gid */
575 err = get_int(&mesg, &an_int);
576 if (err)
577 goto out3;
578 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
579
580 /* fsid */
581 err = get_int(&mesg, &an_int);
582 if (err)
583 goto out3;
584 exp.ex_fsid = an_int;
585
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);
593 else
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.
597 */
598 break;
599 if (err)
600 goto out4;
601 }
602
603 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
604 exp.ex_uuid);
605 if (err)
606 goto out4;
607 /*
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:
611 */
612 if (exp.h.expiry_time < seconds_since_boot())
613 goto out4;
614 /*
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:
620 */
621 err = -EINVAL;
622 if (!uid_valid(exp.ex_anon_uid))
623 goto out4;
624 if (!gid_valid(exp.ex_anon_gid))
625 goto out4;
626 err = 0;
627
628 nfsd4_setup_layout_type(&exp);
629 }
630
631 expp = svc_export_lookup(&exp);
632 if (expp)
633 expp = svc_export_update(&exp, expp);
634 else
635 err = -ENOMEM;
636 cache_flush();
637 if (expp == NULL)
638 err = -ENOMEM;
639 else
640 exp_put(expp);
641 out4:
642 nfsd4_fslocs_free(&exp.ex_fslocs);
643 kfree(exp.ex_uuid);
644 out3:
645 path_put(&exp.ex_path);
646 out1:
647 auth_domain_put(dom);
648 out:
649 kfree(buf);
650 return err;
651 }
652
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);
656
657 static int svc_export_show(struct seq_file *m,
658 struct cache_detail *cd,
659 struct cache_head *h)
660 {
661 struct svc_export *exp ;
662
663 if (h ==NULL) {
664 seq_puts(m, "#path domain(flags)\n");
665 return 0;
666 }
667 exp = container_of(h, struct svc_export, h);
668 seq_path(m, &exp->ex_path, " \t\n\\");
669 seq_putc(m, '\t');
670 seq_escape(m, exp->ex_client->name, " \t\n\\");
671 seq_putc(m, '(');
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);
676 if (exp->ex_uuid) {
677 int i;
678 seq_puts(m, ",uuid=");
679 for (i = 0; i < EX_UUID_LEN; i++) {
680 if ((i&3) == 0 && i)
681 seq_putc(m, ':');
682 seq_printf(m, "%02x", exp->ex_uuid[i]);
683 }
684 }
685 show_secinfo(m, exp);
686 }
687 seq_puts(m, ")\n");
688 return 0;
689 }
690 static int svc_export_match(struct cache_head *a, struct cache_head *b)
691 {
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);
696 }
697
698 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
699 {
700 struct svc_export *new = container_of(cnew, struct svc_export, h);
701 struct svc_export *item = container_of(citem, struct svc_export, h);
702
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;
711 new->ex_uuid = NULL;
712 new->cd = item->cd;
713 }
714
715 static void export_update(struct cache_head *cnew, struct cache_head *citem)
716 {
717 struct svc_export *new = container_of(cnew, struct svc_export, h);
718 struct svc_export *item = container_of(citem, struct svc_export, h);
719 int i;
720
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];
739 }
740 }
741
742 static struct cache_head *svc_export_alloc(void)
743 {
744 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
745 if (i)
746 return &i->h;
747 else
748 return NULL;
749 }
750
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,
763 };
764
765 static int
766 svc_export_hash(struct svc_export *exp)
767 {
768 int hash;
769
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);
773 return hash;
774 }
775
776 static struct svc_export *
777 svc_export_lookup(struct svc_export *exp)
778 {
779 struct cache_head *ch;
780 int hash = svc_export_hash(exp);
781
782 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
783 if (ch)
784 return container_of(ch, struct svc_export, h);
785 else
786 return NULL;
787 }
788
789 static struct svc_export *
790 svc_export_update(struct svc_export *new, struct svc_export *old)
791 {
792 struct cache_head *ch;
793 int hash = svc_export_hash(old);
794
795 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
796 if (ch)
797 return container_of(ch, struct svc_export, h);
798 else
799 return NULL;
800 }
801
802
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)
806 {
807 struct svc_expkey key, *ek;
808 int err;
809
810 if (!clp)
811 return ERR_PTR(-ENOENT);
812
813 key.ek_client = clp;
814 key.ek_fsidtype = fsid_type;
815 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
816
817 ek = svc_expkey_lookup(cd, &key);
818 if (ek == NULL)
819 return ERR_PTR(-ENOMEM);
820 err = cache_check(cd, &ek->h, reqp);
821 if (err)
822 return ERR_PTR(err);
823 return ek;
824 }
825
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)
829 {
830 struct svc_export *exp, key;
831 int err;
832
833 if (!clp)
834 return ERR_PTR(-ENOENT);
835
836 key.ex_client = clp;
837 key.ex_path = *path;
838 key.cd = cd;
839
840 exp = svc_export_lookup(&key);
841 if (exp == NULL)
842 return ERR_PTR(-ENOMEM);
843 err = cache_check(cd, &exp->h, reqp);
844 if (err)
845 return ERR_PTR(err);
846 return exp;
847 }
848
849 /*
850 * Find the export entry for a given dentry.
851 */
852 static struct svc_export *
853 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
854 {
855 struct dentry *saved = dget(path->dentry);
856 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
857
858 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
859 struct dentry *parent = dget_parent(path->dentry);
860 dput(path->dentry);
861 path->dentry = parent;
862 exp = exp_get_by_name(cd, clp, path, NULL);
863 }
864 dput(path->dentry);
865 path->dentry = saved;
866 return exp;
867 }
868
869
870
871 /*
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.
875 */
876 int
877 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
878 struct knfsd_fh *f, int maxsize)
879 {
880 struct svc_export *exp;
881 struct path path;
882 struct inode *inode;
883 struct svc_fh fh;
884 int err;
885 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
886 struct cache_detail *cd = nn->svc_export_cache;
887
888 err = -EPERM;
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);
892 return err;
893 }
894 inode = d_inode(path.dentry);
895
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);
900 if (IS_ERR(exp)) {
901 err = PTR_ERR(exp);
902 goto out;
903 }
904
905 /*
906 * fh must be initialized before calling fh_compose
907 */
908 fh_init(&fh, maxsize);
909 if (fh_compose(&fh, exp, path.dentry, NULL))
910 err = -EINVAL;
911 else
912 err = 0;
913 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
914 fh_put(&fh);
915 exp_put(exp);
916 out:
917 path_put(&path);
918 return err;
919 }
920
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)
924 {
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);
928 if (IS_ERR(ek))
929 return ERR_CAST(ek);
930
931 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
932 cache_put(&ek->h, nn->svc_expkey_cache);
933
934 if (IS_ERR(exp))
935 return ERR_CAST(exp);
936 return exp;
937 }
938
939 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
940 {
941 struct exp_flavor_info *f;
942 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
943
944 /* legacy gss-only clients are always OK: */
945 if (exp->ex_client == rqstp->rq_gssclient)
946 return 0;
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)
950 return 0;
951 }
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)
956 return 0;
957 }
958
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
962 * don't support it
963 */
964
965 if (nfsd4_spo_must_allow(rqstp))
966 return 0;
967
968 return nfserr_wrongsec;
969 }
970
971 /*
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.
975 *
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().
979 */
980 struct svc_export *
981 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
982 {
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;
986
987 if (rqstp->rq_client == NULL)
988 goto gss;
989
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)
993 goto gss;
994 if (IS_ERR(exp))
995 return exp;
996 /* If it has secinfo, assume there are no gss/... clients */
997 if (exp->ex_nflavors > 0)
998 return exp;
999 gss:
1000 /* Otherwise, try falling back on gss client */
1001 if (rqstp->rq_gssclient == NULL)
1002 return exp;
1003 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1004 if (PTR_ERR(gssexp) == -ENOENT)
1005 return exp;
1006 if (!IS_ERR(exp))
1007 exp_put(exp);
1008 return gssexp;
1009 }
1010
1011 struct svc_export *
1012 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1013 {
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;
1017
1018 if (rqstp->rq_client == NULL)
1019 goto gss;
1020
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)
1025 goto gss;
1026 if (IS_ERR(exp))
1027 return exp;
1028 /* If it has secinfo, assume there are no gss/... clients */
1029 if (exp->ex_nflavors > 0)
1030 return exp;
1031 gss:
1032 /* Otherwise, try falling back on gss client */
1033 if (rqstp->rq_gssclient == NULL)
1034 return exp;
1035 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1036 &rqstp->rq_chandle);
1037 if (PTR_ERR(gssexp) == -ENOENT)
1038 return exp;
1039 if (!IS_ERR(exp))
1040 exp_put(exp);
1041 return gssexp;
1042 }
1043
1044 struct svc_export *
1045 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1046 {
1047 struct dentry *saved = dget(path->dentry);
1048 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1049
1050 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1051 struct dentry *parent = dget_parent(path->dentry);
1052 dput(path->dentry);
1053 path->dentry = parent;
1054 exp = rqst_exp_get_by_name(rqstp, path);
1055 }
1056 dput(path->dentry);
1057 path->dentry = saved;
1058 return exp;
1059 }
1060
1061 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1062 {
1063 u32 fsidv[2];
1064
1065 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1066
1067 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1068 }
1069
1070 /*
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
1074 */
1075 __be32
1076 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1077 {
1078 struct svc_export *exp;
1079 __be32 rv;
1080
1081 exp = rqst_find_fsidzero_export(rqstp);
1082 if (IS_ERR(exp))
1083 return nfserrno(PTR_ERR(exp));
1084 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1085 exp_put(exp);
1086 return rv;
1087 }
1088
1089 static struct flags {
1090 int flag;
1091 char *name[2];
1092 } expflags[] = {
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", ""}},
1107 { 0, {"", ""}}
1108 };
1109
1110 static void show_expflags(struct seq_file *m, int flags, int mask)
1111 {
1112 struct flags *flg;
1113 int state, first = 0;
1114
1115 for (flg = expflags; flg->flag; flg++) {
1116 if (flg->flag & ~mask)
1117 continue;
1118 state = (flg->flag & flags) ? 0 : 1;
1119 if (*flg->name[state])
1120 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1121 }
1122 }
1123
1124 static void show_secinfo_flags(struct seq_file *m, int flags)
1125 {
1126 seq_printf(m, ",");
1127 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1128 }
1129
1130 static bool secinfo_flags_equal(int f, int g)
1131 {
1132 f &= NFSEXP_SECINFO_FLAGS;
1133 g &= NFSEXP_SECINFO_FLAGS;
1134 return f == g;
1135 }
1136
1137 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1138 {
1139 int flags;
1140
1141 flags = (*fp)->flags;
1142 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1143 (*fp)++;
1144 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1145 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1146 (*fp)++;
1147 }
1148 return flags;
1149 }
1150
1151 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1152 {
1153 struct exp_flavor_info *f;
1154 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1155 int flags;
1156
1157 if (exp->ex_nflavors == 0)
1158 return;
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);
1163 while (f != end) {
1164 flags = show_secinfo_run(m, &f, end);
1165 show_secinfo_flags(m, flags);
1166 }
1167 }
1168
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)
1171 {
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";
1183 int i;
1184
1185 seq_printf(m, ",%s=", loctype);
1186 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1187 seq_putc(m, '@');
1188 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1189 for (i = 1; i < fsloc->locations_count; i++) {
1190 seq_putc(m, ';');
1191 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1192 seq_putc(m, '@');
1193 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1194 }
1195 }
1196 }
1197
1198 static int e_show(struct seq_file *m, void *p)
1199 {
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;
1203
1204 if (p == SEQ_START_TOKEN) {
1205 seq_puts(m, "# Version 1.1\n");
1206 seq_puts(m, "# Path Client(Flags) # IPs\n");
1207 return 0;
1208 }
1209
1210 exp_get(exp);
1211 if (cache_check(cd, &exp->h, NULL))
1212 return 0;
1213 exp_put(exp);
1214 return svc_export_show(m, cd, cp);
1215 }
1216
1217 const struct seq_operations nfs_exports_op = {
1218 .start = cache_seq_start,
1219 .next = cache_seq_next,
1220 .stop = cache_seq_stop,
1221 .show = e_show,
1222 };
1223
1224 /*
1225 * Initialize the exports module.
1226 */
1227 int
1228 nfsd_export_init(struct net *net)
1229 {
1230 int rv;
1231 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1232
1233 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1234
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);
1239 if (rv)
1240 goto destroy_export_cache;
1241
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;
1246 }
1247 rv = cache_register_net(nn->svc_expkey_cache, net);
1248 if (rv)
1249 goto destroy_expkey_cache;
1250 return 0;
1251
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);
1258 return rv;
1259 }
1260
1261 /*
1262 * Flush exports table - called when last nfsd thread is killed
1263 */
1264 void
1265 nfsd_export_flush(struct net *net)
1266 {
1267 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1268
1269 cache_purge(nn->svc_expkey_cache);
1270 cache_purge(nn->svc_export_cache);
1271 }
1272
1273 /*
1274 * Shutdown the exports module.
1275 */
1276 void
1277 nfsd_export_shutdown(struct net *net)
1278 {
1279 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1280
1281 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1282
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);
1288
1289 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1290 }
Linux with added FPC-III support