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HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()
[linux/fpc-iii.git] / fs / nfsd / export.c
blobb4d84b579f20cd5da76866586dfa283d64c6669a
1 /*
2 * NFS exporting and validation.
3 *
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.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
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>
19
20 #include "nfsd.h"
21 #include "nfsfh.h"
22 #include "netns.h"
23 #include "pnfs.h"
24
25 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27 /*
28 * We have two caches.
29 * One maps client+vfsmnt+dentry to export options - the export map
30 * The other maps client+filehandle-fragment to export options. - the expkey map
31 *
32 * The export options are actually stored in the first map, and the
33 * second map contains a reference to the entry in the first map.
34 */
35
36 #define EXPKEY_HASHBITS 8
37 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
38 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
39
40 static void expkey_put(struct kref *ref)
41 {
42 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
43
44 if (test_bit(CACHE_VALID, &key->h.flags) &&
45 !test_bit(CACHE_NEGATIVE, &key->h.flags))
46 path_put(&key->ek_path);
47 auth_domain_put(key->ek_client);
48 kfree(key);
49 }
50
51 static void expkey_request(struct cache_detail *cd,
52 struct cache_head *h,
53 char **bpp, int *blen)
54 {
55 /* client fsidtype \xfsid */
56 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
57 char type[5];
58
59 qword_add(bpp, blen, ek->ek_client->name);
60 snprintf(type, 5, "%d", ek->ek_fsidtype);
61 qword_add(bpp, blen, type);
62 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
63 (*bpp)[-1] = '\n';
64 }
65
66 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
67 struct svc_expkey *old);
68 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
69
70 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
71 {
72 /* client fsidtype fsid expiry [path] */
73 char *buf;
74 int len;
75 struct auth_domain *dom = NULL;
76 int err;
77 int fsidtype;
78 char *ep;
79 struct svc_expkey key;
80 struct svc_expkey *ek = NULL;
81
82 if (mesg[mlen - 1] != '\n')
83 return -EINVAL;
84 mesg[mlen-1] = 0;
85
86 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
87 err = -ENOMEM;
88 if (!buf)
89 goto out;
90
91 err = -EINVAL;
92 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
93 goto out;
94
95 err = -ENOENT;
96 dom = auth_domain_find(buf);
97 if (!dom)
98 goto out;
99 dprintk("found domain %s\n", buf);
100
101 err = -EINVAL;
102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
103 goto out;
104 fsidtype = simple_strtoul(buf, &ep, 10);
105 if (*ep)
106 goto out;
107 dprintk("found fsidtype %d\n", fsidtype);
108 if (key_len(fsidtype)==0) /* invalid type */
109 goto out;
110 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
111 goto out;
112 dprintk("found fsid length %d\n", len);
113 if (len != key_len(fsidtype))
114 goto out;
115
116 /* OK, we seem to have a valid key */
117 key.h.flags = 0;
118 key.h.expiry_time = get_expiry(&mesg);
119 if (key.h.expiry_time == 0)
120 goto out;
121
122 key.ek_client = dom;
123 key.ek_fsidtype = fsidtype;
124 memcpy(key.ek_fsid, buf, len);
125
126 ek = svc_expkey_lookup(cd, &key);
127 err = -ENOMEM;
128 if (!ek)
129 goto out;
130
131 /* now we want a pathname, or empty meaning NEGATIVE */
132 err = -EINVAL;
133 len = qword_get(&mesg, buf, PAGE_SIZE);
134 if (len < 0)
135 goto out;
136 dprintk("Path seems to be <%s>\n", buf);
137 err = 0;
138 if (len == 0) {
139 set_bit(CACHE_NEGATIVE, &key.h.flags);
140 ek = svc_expkey_update(cd, &key, ek);
141 if (!ek)
142 err = -ENOMEM;
143 } else {
144 err = kern_path(buf, 0, &key.ek_path);
145 if (err)
146 goto out;
147
148 dprintk("Found the path %s\n", buf);
149
150 ek = svc_expkey_update(cd, &key, ek);
151 if (!ek)
152 err = -ENOMEM;
153 path_put(&key.ek_path);
154 }
155 cache_flush();
156 out:
157 if (ek)
158 cache_put(&ek->h, cd);
159 if (dom)
160 auth_domain_put(dom);
161 kfree(buf);
162 return err;
163 }
164
165 static int expkey_show(struct seq_file *m,
166 struct cache_detail *cd,
167 struct cache_head *h)
168 {
169 struct svc_expkey *ek ;
170 int i;
171
172 if (h ==NULL) {
173 seq_puts(m, "#domain fsidtype fsid [path]\n");
174 return 0;
175 }
176 ek = container_of(h, struct svc_expkey, h);
177 seq_printf(m, "%s %d 0x", ek->ek_client->name,
178 ek->ek_fsidtype);
179 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
180 seq_printf(m, "%08x", ek->ek_fsid[i]);
181 if (test_bit(CACHE_VALID, &h->flags) &&
182 !test_bit(CACHE_NEGATIVE, &h->flags)) {
183 seq_printf(m, " ");
184 seq_path(m, &ek->ek_path, "\\ \t\n");
185 }
186 seq_printf(m, "\n");
187 return 0;
188 }
189
190 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
191 {
192 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
193 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
194
195 if (orig->ek_fsidtype != new->ek_fsidtype ||
196 orig->ek_client != new->ek_client ||
197 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
198 return 0;
199 return 1;
200 }
201
202 static inline void expkey_init(struct cache_head *cnew,
203 struct cache_head *citem)
204 {
205 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
206 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
207
208 kref_get(&item->ek_client->ref);
209 new->ek_client = item->ek_client;
210 new->ek_fsidtype = item->ek_fsidtype;
211
212 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
213 }
214
215 static inline void expkey_update(struct cache_head *cnew,
216 struct cache_head *citem)
217 {
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
221 new->ek_path = item->ek_path;
222 path_get(&item->ek_path);
223 }
224
225 static struct cache_head *expkey_alloc(void)
226 {
227 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
228 if (i)
229 return &i->h;
230 else
231 return NULL;
232 }
233
234 static struct cache_detail svc_expkey_cache_template = {
235 .owner = THIS_MODULE,
236 .hash_size = EXPKEY_HASHMAX,
237 .name = "nfsd.fh",
238 .cache_put = expkey_put,
239 .cache_request = expkey_request,
240 .cache_parse = expkey_parse,
241 .cache_show = expkey_show,
242 .match = expkey_match,
243 .init = expkey_init,
244 .update = expkey_update,
245 .alloc = expkey_alloc,
246 };
247
248 static int
249 svc_expkey_hash(struct svc_expkey *item)
250 {
251 int hash = item->ek_fsidtype;
252 char * cp = (char*)item->ek_fsid;
253 int len = key_len(item->ek_fsidtype);
254
255 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
256 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
257 hash &= EXPKEY_HASHMASK;
258 return hash;
259 }
260
261 static struct svc_expkey *
262 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
263 {
264 struct cache_head *ch;
265 int hash = svc_expkey_hash(item);
266
267 ch = sunrpc_cache_lookup(cd, &item->h, hash);
268 if (ch)
269 return container_of(ch, struct svc_expkey, h);
270 else
271 return NULL;
272 }
273
274 static struct svc_expkey *
275 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
276 struct svc_expkey *old)
277 {
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(new);
280
281 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
282 if (ch)
283 return container_of(ch, struct svc_expkey, h);
284 else
285 return NULL;
286 }
287
288
289 #define EXPORT_HASHBITS 8
290 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
291
292 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
293 {
294 struct nfsd4_fs_location *locations = fsloc->locations;
295 int i;
296
297 if (!locations)
298 return;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(locations[i].path);
302 kfree(locations[i].hosts);
303 }
304
305 kfree(locations);
306 fsloc->locations = NULL;
307 }
308
309 static void svc_export_put(struct kref *ref)
310 {
311 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
312 path_put(&exp->ex_path);
313 auth_domain_put(exp->ex_client);
314 nfsd4_fslocs_free(&exp->ex_fslocs);
315 kfree(exp->ex_uuid);
316 kfree(exp);
317 }
318
319 static void svc_export_request(struct cache_detail *cd,
320 struct cache_head *h,
321 char **bpp, int *blen)
322 {
323 /* client path */
324 struct svc_export *exp = container_of(h, struct svc_export, h);
325 char *pth;
326
327 qword_add(bpp, blen, exp->ex_client->name);
328 pth = d_path(&exp->ex_path, *bpp, *blen);
329 if (IS_ERR(pth)) {
330 /* is this correct? */
331 (*bpp)[0] = '\n';
332 return;
333 }
334 qword_add(bpp, blen, pth);
335 (*bpp)[-1] = '\n';
336 }
337
338 static struct svc_export *svc_export_update(struct svc_export *new,
339 struct svc_export *old);
340 static struct svc_export *svc_export_lookup(struct svc_export *);
341
342 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
343 {
344
345 /*
346 * We currently export only dirs, regular files, and (for v4
347 * pseudoroot) symlinks.
348 */
349 if (!S_ISDIR(inode->i_mode) &&
350 !S_ISLNK(inode->i_mode) &&
351 !S_ISREG(inode->i_mode))
352 return -ENOTDIR;
353
354 /*
355 * Mountd should never pass down a writeable V4ROOT export, but,
356 * just to make sure:
357 */
358 if (*flags & NFSEXP_V4ROOT)
359 *flags |= NFSEXP_READONLY;
360
361 /* There are two requirements on a filesystem to be exportable.
362 * 1: We must be able to identify the filesystem from a number.
363 * either a device number (so FS_REQUIRES_DEV needed)
364 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
365 * 2: We must be able to find an inode from a filehandle.
366 * This means that s_export_op must be set.
367 */
368 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
369 !(*flags & NFSEXP_FSID) &&
370 uuid == NULL) {
371 dprintk("exp_export: export of non-dev fs without fsid\n");
372 return -EINVAL;
373 }
374
375 if (!inode->i_sb->s_export_op ||
376 !inode->i_sb->s_export_op->fh_to_dentry) {
377 dprintk("exp_export: export of invalid fs type.\n");
378 return -EINVAL;
379 }
380
381 return 0;
382
383 }
384
385 #ifdef CONFIG_NFSD_V4
386
387 static int
388 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389 {
390 int len;
391 int migrated, i, err;
392
393 /* more than one fsloc */
394 if (fsloc->locations)
395 return -EINVAL;
396
397 /* listsize */
398 err = get_uint(mesg, &fsloc->locations_count);
399 if (err)
400 return err;
401 if (fsloc->locations_count > MAX_FS_LOCATIONS)
402 return -EINVAL;
403 if (fsloc->locations_count == 0)
404 return 0;
405
406 fsloc->locations = kzalloc(fsloc->locations_count
407 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
408 if (!fsloc->locations)
409 return -ENOMEM;
410 for (i=0; i < fsloc->locations_count; i++) {
411 /* colon separated host list */
412 err = -EINVAL;
413 len = qword_get(mesg, buf, PAGE_SIZE);
414 if (len <= 0)
415 goto out_free_all;
416 err = -ENOMEM;
417 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
418 if (!fsloc->locations[i].hosts)
419 goto out_free_all;
420 err = -EINVAL;
421 /* slash separated path component list */
422 len = qword_get(mesg, buf, PAGE_SIZE);
423 if (len <= 0)
424 goto out_free_all;
425 err = -ENOMEM;
426 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].path)
428 goto out_free_all;
429 }
430 /* migrated */
431 err = get_int(mesg, &migrated);
432 if (err)
433 goto out_free_all;
434 err = -EINVAL;
435 if (migrated < 0 || migrated > 1)
436 goto out_free_all;
437 fsloc->migrated = migrated;
438 return 0;
439 out_free_all:
440 nfsd4_fslocs_free(fsloc);
441 return err;
442 }
443
444 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
445 {
446 struct exp_flavor_info *f;
447 u32 listsize;
448 int err;
449
450 /* more than one secinfo */
451 if (exp->ex_nflavors)
452 return -EINVAL;
453
454 err = get_uint(mesg, &listsize);
455 if (err)
456 return err;
457 if (listsize > MAX_SECINFO_LIST)
458 return -EINVAL;
459
460 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
461 err = get_uint(mesg, &f->pseudoflavor);
462 if (err)
463 return err;
464 /*
465 * XXX: It would be nice to also check whether this
466 * pseudoflavor is supported, so we can discover the
467 * problem at export time instead of when a client fails
468 * to authenticate.
469 */
470 err = get_uint(mesg, &f->flags);
471 if (err)
472 return err;
473 /* Only some flags are allowed to differ between flavors: */
474 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
475 return -EINVAL;
476 }
477 exp->ex_nflavors = listsize;
478 return 0;
479 }
480
481 #else /* CONFIG_NFSD_V4 */
482 static inline int
483 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
484 static inline int
485 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
486 #endif
487
488 static inline int
489 uuid_parse(char **mesg, char *buf, unsigned char **puuid)
490 {
491 int len;
492
493 /* more than one uuid */
494 if (*puuid)
495 return -EINVAL;
496
497 /* expect a 16 byte uuid encoded as \xXXXX... */
498 len = qword_get(mesg, buf, PAGE_SIZE);
499 if (len != EX_UUID_LEN)
500 return -EINVAL;
501
502 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
503 if (*puuid == NULL)
504 return -ENOMEM;
505
506 return 0;
507 }
508
509 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
510 {
511 /* client path expiry [flags anonuid anongid fsid] */
512 char *buf;
513 int len;
514 int err;
515 struct auth_domain *dom = NULL;
516 struct svc_export exp = {}, *expp;
517 int an_int;
518
519 if (mesg[mlen-1] != '\n')
520 return -EINVAL;
521 mesg[mlen-1] = 0;
522
523 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
524 if (!buf)
525 return -ENOMEM;
526
527 /* client */
528 err = -EINVAL;
529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 if (len <= 0)
531 goto out;
532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
540 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out1;
542
543 err = kern_path(buf, 0, &exp.ex_path);
544 if (err)
545 goto out1;
546
547 exp.ex_client = dom;
548 exp.cd = cd;
549 exp.ex_devid_map = NULL;
550
551 /* expiry */
552 err = -EINVAL;
553 exp.h.expiry_time = get_expiry(&mesg);
554 if (exp.h.expiry_time == 0)
555 goto out3;
556
557 /* flags */
558 err = get_int(&mesg, &an_int);
559 if (err == -ENOENT) {
560 err = 0;
561 set_bit(CACHE_NEGATIVE, &exp.h.flags);
562 } else {
563 if (err || an_int < 0)
564 goto out3;
565 exp.ex_flags= an_int;
566
567 /* anon uid */
568 err = get_int(&mesg, &an_int);
569 if (err)
570 goto out3;
571 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
572
573 /* anon gid */
574 err = get_int(&mesg, &an_int);
575 if (err)
576 goto out3;
577 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
581 if (err)
582 goto out3;
583 exp.ex_fsid = an_int;
584
585 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
586 if (strcmp(buf, "fsloc") == 0)
587 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
588 else if (strcmp(buf, "uuid") == 0)
589 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
590 else if (strcmp(buf, "secinfo") == 0)
591 err = secinfo_parse(&mesg, buf, &exp);
592 else
593 /* quietly ignore unknown words and anything
594 * following. Newer user-space can try to set
595 * new values, then see what the result was.
596 */
597 break;
598 if (err)
599 goto out4;
600 }
601
602 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
603 exp.ex_uuid);
604 if (err)
605 goto out4;
606 /*
607 * No point caching this if it would immediately expire.
608 * Also, this protects exportfs's dummy export from the
609 * anon_uid/anon_gid checks:
610 */
611 if (exp.h.expiry_time < seconds_since_boot())
612 goto out4;
613 /*
614 * For some reason exportfs has been passing down an
615 * invalid (-1) uid & gid on the "dummy" export which it
616 * uses to test export support. To make sure exportfs
617 * sees errors from check_export we therefore need to
618 * delay these checks till after check_export:
619 */
620 err = -EINVAL;
621 if (!uid_valid(exp.ex_anon_uid))
622 goto out4;
623 if (!gid_valid(exp.ex_anon_gid))
624 goto out4;
625 err = 0;
626
627 nfsd4_setup_layout_type(&exp);
628 }
629
630 expp = svc_export_lookup(&exp);
631 if (expp)
632 expp = svc_export_update(&exp, expp);
633 else
634 err = -ENOMEM;
635 cache_flush();
636 if (expp == NULL)
637 err = -ENOMEM;
638 else
639 exp_put(expp);
640 out4:
641 nfsd4_fslocs_free(&exp.ex_fslocs);
642 kfree(exp.ex_uuid);
643 out3:
644 path_put(&exp.ex_path);
645 out1:
646 auth_domain_put(dom);
647 out:
648 kfree(buf);
649 return err;
650 }
651
652 static void exp_flags(struct seq_file *m, int flag, int fsid,
653 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
654 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
655
656 static int svc_export_show(struct seq_file *m,
657 struct cache_detail *cd,
658 struct cache_head *h)
659 {
660 struct svc_export *exp ;
661
662 if (h ==NULL) {
663 seq_puts(m, "#path domain(flags)\n");
664 return 0;
665 }
666 exp = container_of(h, struct svc_export, h);
667 seq_path(m, &exp->ex_path, " \t\n\\");
668 seq_putc(m, '\t');
669 seq_escape(m, exp->ex_client->name, " \t\n\\");
670 seq_putc(m, '(');
671 if (test_bit(CACHE_VALID, &h->flags) &&
672 !test_bit(CACHE_NEGATIVE, &h->flags)) {
673 exp_flags(m, exp->ex_flags, exp->ex_fsid,
674 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
675 if (exp->ex_uuid) {
676 int i;
677 seq_puts(m, ",uuid=");
678 for (i = 0; i < EX_UUID_LEN; i++) {
679 if ((i&3) == 0 && i)
680 seq_putc(m, ':');
681 seq_printf(m, "%02x", exp->ex_uuid[i]);
682 }
683 }
684 show_secinfo(m, exp);
685 }
686 seq_puts(m, ")\n");
687 return 0;
688 }
689 static int svc_export_match(struct cache_head *a, struct cache_head *b)
690 {
691 struct svc_export *orig = container_of(a, struct svc_export, h);
692 struct svc_export *new = container_of(b, struct svc_export, h);
693 return orig->ex_client == new->ex_client &&
694 path_equal(&orig->ex_path, &new->ex_path);
695 }
696
697 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
698 {
699 struct svc_export *new = container_of(cnew, struct svc_export, h);
700 struct svc_export *item = container_of(citem, struct svc_export, h);
701
702 kref_get(&item->ex_client->ref);
703 new->ex_client = item->ex_client;
704 new->ex_path = item->ex_path;
705 path_get(&item->ex_path);
706 new->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = 0;
708 new->ex_fslocs.migrated = 0;
709 new->ex_layout_type = 0;
710 new->ex_uuid = NULL;
711 new->cd = item->cd;
712 }
713
714 static void export_update(struct cache_head *cnew, struct cache_head *citem)
715 {
716 struct svc_export *new = container_of(cnew, struct svc_export, h);
717 struct svc_export *item = container_of(citem, struct svc_export, h);
718 int i;
719
720 new->ex_flags = item->ex_flags;
721 new->ex_anon_uid = item->ex_anon_uid;
722 new->ex_anon_gid = item->ex_anon_gid;
723 new->ex_fsid = item->ex_fsid;
724 new->ex_devid_map = item->ex_devid_map;
725 item->ex_devid_map = NULL;
726 new->ex_uuid = item->ex_uuid;
727 item->ex_uuid = NULL;
728 new->ex_fslocs.locations = item->ex_fslocs.locations;
729 item->ex_fslocs.locations = NULL;
730 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
731 item->ex_fslocs.locations_count = 0;
732 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
733 item->ex_fslocs.migrated = 0;
734 new->ex_layout_type = item->ex_layout_type;
735 new->ex_nflavors = item->ex_nflavors;
736 for (i = 0; i < MAX_SECINFO_LIST; i++) {
737 new->ex_flavors[i] = item->ex_flavors[i];
738 }
739 }
740
741 static struct cache_head *svc_export_alloc(void)
742 {
743 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
744 if (i)
745 return &i->h;
746 else
747 return NULL;
748 }
749
750 static struct cache_detail svc_export_cache_template = {
751 .owner = THIS_MODULE,
752 .hash_size = EXPORT_HASHMAX,
753 .name = "nfsd.export",
754 .cache_put = svc_export_put,
755 .cache_request = svc_export_request,
756 .cache_parse = svc_export_parse,
757 .cache_show = svc_export_show,
758 .match = svc_export_match,
759 .init = svc_export_init,
760 .update = export_update,
761 .alloc = svc_export_alloc,
762 };
763
764 static int
765 svc_export_hash(struct svc_export *exp)
766 {
767 int hash;
768
769 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
770 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
771 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
772 return hash;
773 }
774
775 static struct svc_export *
776 svc_export_lookup(struct svc_export *exp)
777 {
778 struct cache_head *ch;
779 int hash = svc_export_hash(exp);
780
781 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
782 if (ch)
783 return container_of(ch, struct svc_export, h);
784 else
785 return NULL;
786 }
787
788 static struct svc_export *
789 svc_export_update(struct svc_export *new, struct svc_export *old)
790 {
791 struct cache_head *ch;
792 int hash = svc_export_hash(old);
793
794 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
795 if (ch)
796 return container_of(ch, struct svc_export, h);
797 else
798 return NULL;
799 }
800
801
802 static struct svc_expkey *
803 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
804 u32 *fsidv, struct cache_req *reqp)
805 {
806 struct svc_expkey key, *ek;
807 int err;
808
809 if (!clp)
810 return ERR_PTR(-ENOENT);
811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
815
816 ek = svc_expkey_lookup(cd, &key);
817 if (ek == NULL)
818 return ERR_PTR(-ENOMEM);
819 err = cache_check(cd, &ek->h, reqp);
820 if (err)
821 return ERR_PTR(err);
822 return ek;
823 }
824
825 static struct svc_export *
826 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
827 const struct path *path, struct cache_req *reqp)
828 {
829 struct svc_export *exp, key;
830 int err;
831
832 if (!clp)
833 return ERR_PTR(-ENOENT);
834
835 key.ex_client = clp;
836 key.ex_path = *path;
837 key.cd = cd;
838
839 exp = svc_export_lookup(&key);
840 if (exp == NULL)
841 return ERR_PTR(-ENOMEM);
842 err = cache_check(cd, &exp->h, reqp);
843 if (err)
844 return ERR_PTR(err);
845 return exp;
846 }
847
848 /*
849 * Find the export entry for a given dentry.
850 */
851 static struct svc_export *
852 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
853 {
854 struct dentry *saved = dget(path->dentry);
855 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
856
857 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
858 struct dentry *parent = dget_parent(path->dentry);
859 dput(path->dentry);
860 path->dentry = parent;
861 exp = exp_get_by_name(cd, clp, path, NULL);
862 }
863 dput(path->dentry);
864 path->dentry = saved;
865 return exp;
866 }
867
868
869
870 /*
871 * Obtain the root fh on behalf of a client.
872 * This could be done in user space, but I feel that it adds some safety
873 * since its harder to fool a kernel module than a user space program.
874 */
875 int
876 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
877 struct knfsd_fh *f, int maxsize)
878 {
879 struct svc_export *exp;
880 struct path path;
881 struct inode *inode;
882 struct svc_fh fh;
883 int err;
884 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
885 struct cache_detail *cd = nn->svc_export_cache;
886
887 err = -EPERM;
888 /* NB: we probably ought to check that it's NUL-terminated */
889 if (kern_path(name, 0, &path)) {
890 printk("nfsd: exp_rootfh path not found %s", name);
891 return err;
892 }
893 inode = d_inode(path.dentry);
894
895 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
896 name, path.dentry, clp->name,
897 inode->i_sb->s_id, inode->i_ino);
898 exp = exp_parent(cd, clp, &path);
899 if (IS_ERR(exp)) {
900 err = PTR_ERR(exp);
901 goto out;
902 }
903
904 /*
905 * fh must be initialized before calling fh_compose
906 */
907 fh_init(&fh, maxsize);
908 if (fh_compose(&fh, exp, path.dentry, NULL))
909 err = -EINVAL;
910 else
911 err = 0;
912 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
913 fh_put(&fh);
914 exp_put(exp);
915 out:
916 path_put(&path);
917 return err;
918 }
919
920 static struct svc_export *exp_find(struct cache_detail *cd,
921 struct auth_domain *clp, int fsid_type,
922 u32 *fsidv, struct cache_req *reqp)
923 {
924 struct svc_export *exp;
925 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
926 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
927 if (IS_ERR(ek))
928 return ERR_CAST(ek);
929
930 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
931 cache_put(&ek->h, nn->svc_expkey_cache);
932
933 if (IS_ERR(exp))
934 return ERR_CAST(exp);
935 return exp;
936 }
937
938 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
939 {
940 struct exp_flavor_info *f;
941 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
942
943 /* legacy gss-only clients are always OK: */
944 if (exp->ex_client == rqstp->rq_gssclient)
945 return 0;
946 /* ip-address based client; check sec= export option: */
947 for (f = exp->ex_flavors; f < end; f++) {
948 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
949 return 0;
950 }
951 /* defaults in absence of sec= options: */
952 if (exp->ex_nflavors == 0) {
953 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
954 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
955 return 0;
956 }
957 return nfserr_wrongsec;
958 }
959
960 /*
961 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
962 * auth_unix client) if it's available and has secinfo information;
963 * otherwise, will try to use rq_gssclient.
964 *
965 * Called from functions that handle requests; functions that do work on
966 * behalf of mountd are passed a single client name to use, and should
967 * use exp_get_by_name() or exp_find().
968 */
969 struct svc_export *
970 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
971 {
972 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
973 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
974 struct cache_detail *cd = nn->svc_export_cache;
975
976 if (rqstp->rq_client == NULL)
977 goto gss;
978
979 /* First try the auth_unix client: */
980 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
981 if (PTR_ERR(exp) == -ENOENT)
982 goto gss;
983 if (IS_ERR(exp))
984 return exp;
985 /* If it has secinfo, assume there are no gss/... clients */
986 if (exp->ex_nflavors > 0)
987 return exp;
988 gss:
989 /* Otherwise, try falling back on gss client */
990 if (rqstp->rq_gssclient == NULL)
991 return exp;
992 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
993 if (PTR_ERR(gssexp) == -ENOENT)
994 return exp;
995 if (!IS_ERR(exp))
996 exp_put(exp);
997 return gssexp;
998 }
999
1000 struct svc_export *
1001 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1002 {
1003 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1004 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1005 struct cache_detail *cd = nn->svc_export_cache;
1006
1007 if (rqstp->rq_client == NULL)
1008 goto gss;
1009
1010 /* First try the auth_unix client: */
1011 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1012 fsidv, &rqstp->rq_chandle);
1013 if (PTR_ERR(exp) == -ENOENT)
1014 goto gss;
1015 if (IS_ERR(exp))
1016 return exp;
1017 /* If it has secinfo, assume there are no gss/... clients */
1018 if (exp->ex_nflavors > 0)
1019 return exp;
1020 gss:
1021 /* Otherwise, try falling back on gss client */
1022 if (rqstp->rq_gssclient == NULL)
1023 return exp;
1024 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1025 &rqstp->rq_chandle);
1026 if (PTR_ERR(gssexp) == -ENOENT)
1027 return exp;
1028 if (!IS_ERR(exp))
1029 exp_put(exp);
1030 return gssexp;
1031 }
1032
1033 struct svc_export *
1034 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1035 {
1036 struct dentry *saved = dget(path->dentry);
1037 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1038
1039 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1040 struct dentry *parent = dget_parent(path->dentry);
1041 dput(path->dentry);
1042 path->dentry = parent;
1043 exp = rqst_exp_get_by_name(rqstp, path);
1044 }
1045 dput(path->dentry);
1046 path->dentry = saved;
1047 return exp;
1048 }
1049
1050 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1051 {
1052 u32 fsidv[2];
1053
1054 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1055
1056 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1057 }
1058
1059 /*
1060 * Called when we need the filehandle for the root of the pseudofs,
1061 * for a given NFSv4 client. The root is defined to be the
1062 * export point with fsid==0
1063 */
1064 __be32
1065 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1066 {
1067 struct svc_export *exp;
1068 __be32 rv;
1069
1070 exp = rqst_find_fsidzero_export(rqstp);
1071 if (IS_ERR(exp))
1072 return nfserrno(PTR_ERR(exp));
1073 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1074 exp_put(exp);
1075 return rv;
1076 }
1077
1078 static struct flags {
1079 int flag;
1080 char *name[2];
1081 } expflags[] = {
1082 { NFSEXP_READONLY, {"ro", "rw"}},
1083 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1084 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1085 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1086 { NFSEXP_ASYNC, {"async", "sync"}},
1087 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1088 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1089 { NFSEXP_NOHIDE, {"nohide", ""}},
1090 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1091 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1092 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1093 { NFSEXP_V4ROOT, {"v4root", ""}},
1094 { NFSEXP_PNFS, {"pnfs", ""}},
1095 { 0, {"", ""}}
1096 };
1097
1098 static void show_expflags(struct seq_file *m, int flags, int mask)
1099 {
1100 struct flags *flg;
1101 int state, first = 0;
1102
1103 for (flg = expflags; flg->flag; flg++) {
1104 if (flg->flag & ~mask)
1105 continue;
1106 state = (flg->flag & flags) ? 0 : 1;
1107 if (*flg->name[state])
1108 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1109 }
1110 }
1111
1112 static void show_secinfo_flags(struct seq_file *m, int flags)
1113 {
1114 seq_printf(m, ",");
1115 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1116 }
1117
1118 static bool secinfo_flags_equal(int f, int g)
1119 {
1120 f &= NFSEXP_SECINFO_FLAGS;
1121 g &= NFSEXP_SECINFO_FLAGS;
1122 return f == g;
1123 }
1124
1125 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1126 {
1127 int flags;
1128
1129 flags = (*fp)->flags;
1130 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1131 (*fp)++;
1132 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1133 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1134 (*fp)++;
1135 }
1136 return flags;
1137 }
1138
1139 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1140 {
1141 struct exp_flavor_info *f;
1142 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1143 int flags;
1144
1145 if (exp->ex_nflavors == 0)
1146 return;
1147 f = exp->ex_flavors;
1148 flags = show_secinfo_run(m, &f, end);
1149 if (!secinfo_flags_equal(flags, exp->ex_flags))
1150 show_secinfo_flags(m, flags);
1151 while (f != end) {
1152 flags = show_secinfo_run(m, &f, end);
1153 show_secinfo_flags(m, flags);
1154 }
1155 }
1156
1157 static void exp_flags(struct seq_file *m, int flag, int fsid,
1158 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1159 {
1160 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1161 if (flag & NFSEXP_FSID)
1162 seq_printf(m, ",fsid=%d", fsid);
1163 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1164 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1165 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1166 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1167 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1168 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1169 if (fsloc && fsloc->locations_count > 0) {
1170 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1171 int i;
1172
1173 seq_printf(m, ",%s=", loctype);
1174 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1175 seq_putc(m, '@');
1176 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1177 for (i = 1; i < fsloc->locations_count; i++) {
1178 seq_putc(m, ';');
1179 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1180 seq_putc(m, '@');
1181 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1182 }
1183 }
1184 }
1185
1186 static int e_show(struct seq_file *m, void *p)
1187 {
1188 struct cache_head *cp = p;
1189 struct svc_export *exp = container_of(cp, struct svc_export, h);
1190 struct cache_detail *cd = m->private;
1191
1192 if (p == SEQ_START_TOKEN) {
1193 seq_puts(m, "# Version 1.1\n");
1194 seq_puts(m, "# Path Client(Flags) # IPs\n");
1195 return 0;
1196 }
1197
1198 exp_get(exp);
1199 if (cache_check(cd, &exp->h, NULL))
1200 return 0;
1201 exp_put(exp);
1202 return svc_export_show(m, cd, cp);
1203 }
1204
1205 const struct seq_operations nfs_exports_op = {
1206 .start = cache_seq_start,
1207 .next = cache_seq_next,
1208 .stop = cache_seq_stop,
1209 .show = e_show,
1210 };
1211
1212 /*
1213 * Initialize the exports module.
1214 */
1215 int
1216 nfsd_export_init(struct net *net)
1217 {
1218 int rv;
1219 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1220
1221 dprintk("nfsd: initializing export module (net: %p).\n", net);
1222
1223 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1224 if (IS_ERR(nn->svc_export_cache))
1225 return PTR_ERR(nn->svc_export_cache);
1226 rv = cache_register_net(nn->svc_export_cache, net);
1227 if (rv)
1228 goto destroy_export_cache;
1229
1230 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1231 if (IS_ERR(nn->svc_expkey_cache)) {
1232 rv = PTR_ERR(nn->svc_expkey_cache);
1233 goto unregister_export_cache;
1234 }
1235 rv = cache_register_net(nn->svc_expkey_cache, net);
1236 if (rv)
1237 goto destroy_expkey_cache;
1238 return 0;
1239
1240 destroy_expkey_cache:
1241 cache_destroy_net(nn->svc_expkey_cache, net);
1242 unregister_export_cache:
1243 cache_unregister_net(nn->svc_export_cache, net);
1244 destroy_export_cache:
1245 cache_destroy_net(nn->svc_export_cache, net);
1246 return rv;
1247 }
1248
1249 /*
1250 * Flush exports table - called when last nfsd thread is killed
1251 */
1252 void
1253 nfsd_export_flush(struct net *net)
1254 {
1255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
1257 cache_purge(nn->svc_expkey_cache);
1258 cache_purge(nn->svc_export_cache);
1259 }
1260
1261 /*
1262 * Shutdown the exports module.
1263 */
1264 void
1265 nfsd_export_shutdown(struct net *net)
1266 {
1267 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1268
1269 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1270
1271 cache_unregister_net(nn->svc_expkey_cache, net);
1272 cache_unregister_net(nn->svc_export_cache, net);
1273 cache_destroy_net(nn->svc_expkey_cache, net);
1274 cache_destroy_net(nn->svc_export_cache, net);
1275 svcauth_unix_purge(net);
1276
1277 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1278 }
Linux with added FPC-III support