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Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6
[deliverable/linux.git] / fs / nfsd / export.c
1 #define MSNFS /* HACK HACK */
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
20 #include <linux/nfsd/syscall.h>
21 #include <net/ipv6.h>
22
23 #include "nfsd.h"
24 #include "nfsfh.h"
25
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28 typedef struct auth_domain svc_client;
29 typedef struct svc_export svc_export;
30
31 static void exp_do_unexport(svc_export *unexp);
32 static int exp_verify_string(char *cp, int max);
33
34 /*
35 * We have two caches.
36 * One maps client+vfsmnt+dentry to export options - the export map
37 * The other maps client+filehandle-fragment to export options. - the expkey map
38 *
39 * The export options are actually stored in the first map, and the
40 * second map contains a reference to the entry in the first map.
41 */
42
43 #define EXPKEY_HASHBITS 8
44 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
45 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
46 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
47
48 static void expkey_put(struct kref *ref)
49 {
50 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
51
52 if (test_bit(CACHE_VALID, &key->h.flags) &&
53 !test_bit(CACHE_NEGATIVE, &key->h.flags))
54 path_put(&key->ek_path);
55 auth_domain_put(key->ek_client);
56 kfree(key);
57 }
58
59 static void expkey_request(struct cache_detail *cd,
60 struct cache_head *h,
61 char **bpp, int *blen)
62 {
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
71 (*bpp)[-1] = '\n';
72 }
73
74 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
75 {
76 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
77 }
78
79 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
80 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
81 static struct cache_detail svc_expkey_cache;
82
83 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
84 {
85 /* client fsidtype fsid [path] */
86 char *buf;
87 int len;
88 struct auth_domain *dom = NULL;
89 int err;
90 int fsidtype;
91 char *ep;
92 struct svc_expkey key;
93 struct svc_expkey *ek = NULL;
94
95 if (mesg[mlen-1] != '\n')
96 return -EINVAL;
97 mesg[mlen-1] = 0;
98
99 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
100 err = -ENOMEM;
101 if (!buf)
102 goto out;
103
104 err = -EINVAL;
105 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
106 goto out;
107
108 err = -ENOENT;
109 dom = auth_domain_find(buf);
110 if (!dom)
111 goto out;
112 dprintk("found domain %s\n", buf);
113
114 err = -EINVAL;
115 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 goto out;
117 fsidtype = simple_strtoul(buf, &ep, 10);
118 if (*ep)
119 goto out;
120 dprintk("found fsidtype %d\n", fsidtype);
121 if (key_len(fsidtype)==0) /* invalid type */
122 goto out;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 dprintk("found fsid length %d\n", len);
126 if (len != key_len(fsidtype))
127 goto out;
128
129 /* OK, we seem to have a valid key */
130 key.h.flags = 0;
131 key.h.expiry_time = get_expiry(&mesg);
132 if (key.h.expiry_time == 0)
133 goto out;
134
135 key.ek_client = dom;
136 key.ek_fsidtype = fsidtype;
137 memcpy(key.ek_fsid, buf, len);
138
139 ek = svc_expkey_lookup(&key);
140 err = -ENOMEM;
141 if (!ek)
142 goto out;
143
144 /* now we want a pathname, or empty meaning NEGATIVE */
145 err = -EINVAL;
146 len = qword_get(&mesg, buf, PAGE_SIZE);
147 if (len < 0)
148 goto out;
149 dprintk("Path seems to be <%s>\n", buf);
150 err = 0;
151 if (len == 0) {
152 set_bit(CACHE_NEGATIVE, &key.h.flags);
153 ek = svc_expkey_update(&key, ek);
154 if (!ek)
155 err = -ENOMEM;
156 } else {
157 err = kern_path(buf, 0, &key.ek_path);
158 if (err)
159 goto out;
160
161 dprintk("Found the path %s\n", buf);
162
163 ek = svc_expkey_update(&key, ek);
164 if (!ek)
165 err = -ENOMEM;
166 path_put(&key.ek_path);
167 }
168 cache_flush();
169 out:
170 if (ek)
171 cache_put(&ek->h, &svc_expkey_cache);
172 if (dom)
173 auth_domain_put(dom);
174 kfree(buf);
175 return err;
176 }
177
178 static int expkey_show(struct seq_file *m,
179 struct cache_detail *cd,
180 struct cache_head *h)
181 {
182 struct svc_expkey *ek ;
183 int i;
184
185 if (h ==NULL) {
186 seq_puts(m, "#domain fsidtype fsid [path]\n");
187 return 0;
188 }
189 ek = container_of(h, struct svc_expkey, h);
190 seq_printf(m, "%s %d 0x", ek->ek_client->name,
191 ek->ek_fsidtype);
192 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
193 seq_printf(m, "%08x", ek->ek_fsid[i]);
194 if (test_bit(CACHE_VALID, &h->flags) &&
195 !test_bit(CACHE_NEGATIVE, &h->flags)) {
196 seq_printf(m, " ");
197 seq_path(m, &ek->ek_path, "\\ \t\n");
198 }
199 seq_printf(m, "\n");
200 return 0;
201 }
202
203 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
204 {
205 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
206 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
207
208 if (orig->ek_fsidtype != new->ek_fsidtype ||
209 orig->ek_client != new->ek_client ||
210 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
211 return 0;
212 return 1;
213 }
214
215 static inline void expkey_init(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 kref_get(&item->ek_client->ref);
222 new->ek_client = item->ek_client;
223 new->ek_fsidtype = item->ek_fsidtype;
224
225 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
226 }
227
228 static inline void expkey_update(struct cache_head *cnew,
229 struct cache_head *citem)
230 {
231 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
232 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
233
234 new->ek_path = item->ek_path;
235 path_get(&item->ek_path);
236 }
237
238 static struct cache_head *expkey_alloc(void)
239 {
240 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
241 if (i)
242 return &i->h;
243 else
244 return NULL;
245 }
246
247 static struct cache_detail svc_expkey_cache = {
248 .owner = THIS_MODULE,
249 .hash_size = EXPKEY_HASHMAX,
250 .hash_table = expkey_table,
251 .name = "nfsd.fh",
252 .cache_put = expkey_put,
253 .cache_upcall = expkey_upcall,
254 .cache_parse = expkey_parse,
255 .cache_show = expkey_show,
256 .match = expkey_match,
257 .init = expkey_init,
258 .update = expkey_update,
259 .alloc = expkey_alloc,
260 };
261
262 static int
263 svc_expkey_hash(struct svc_expkey *item)
264 {
265 int hash = item->ek_fsidtype;
266 char * cp = (char*)item->ek_fsid;
267 int len = key_len(item->ek_fsidtype);
268
269 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
270 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
271 hash &= EXPKEY_HASHMASK;
272 return hash;
273 }
274
275 static struct svc_expkey *
276 svc_expkey_lookup(struct svc_expkey *item)
277 {
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(item);
280
281 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
282 hash);
283 if (ch)
284 return container_of(ch, struct svc_expkey, h);
285 else
286 return NULL;
287 }
288
289 static struct svc_expkey *
290 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
291 {
292 struct cache_head *ch;
293 int hash = svc_expkey_hash(new);
294
295 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
296 &old->h, hash);
297 if (ch)
298 return container_of(ch, struct svc_expkey, h);
299 else
300 return NULL;
301 }
302
303
304 #define EXPORT_HASHBITS 8
305 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
306 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
307
308 static struct cache_head *export_table[EXPORT_HASHMAX];
309
310 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
311 {
312 int i;
313
314 for (i = 0; i < fsloc->locations_count; i++) {
315 kfree(fsloc->locations[i].path);
316 kfree(fsloc->locations[i].hosts);
317 }
318 kfree(fsloc->locations);
319 }
320
321 static void svc_export_put(struct kref *ref)
322 {
323 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
324 path_put(&exp->ex_path);
325 auth_domain_put(exp->ex_client);
326 kfree(exp->ex_pathname);
327 nfsd4_fslocs_free(&exp->ex_fslocs);
328 kfree(exp);
329 }
330
331 static void svc_export_request(struct cache_detail *cd,
332 struct cache_head *h,
333 char **bpp, int *blen)
334 {
335 /* client path */
336 struct svc_export *exp = container_of(h, struct svc_export, h);
337 char *pth;
338
339 qword_add(bpp, blen, exp->ex_client->name);
340 pth = d_path(&exp->ex_path, *bpp, *blen);
341 if (IS_ERR(pth)) {
342 /* is this correct? */
343 (*bpp)[0] = '\n';
344 return;
345 }
346 qword_add(bpp, blen, pth);
347 (*bpp)[-1] = '\n';
348 }
349
350 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
351 {
352 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
353 }
354
355 static struct svc_export *svc_export_update(struct svc_export *new,
356 struct svc_export *old);
357 static struct svc_export *svc_export_lookup(struct svc_export *);
358
359 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
360 {
361
362 /*
363 * We currently export only dirs, regular files, and (for v4
364 * pseudoroot) symlinks.
365 */
366 if (!S_ISDIR(inode->i_mode) &&
367 !S_ISLNK(inode->i_mode) &&
368 !S_ISREG(inode->i_mode))
369 return -ENOTDIR;
370
371 /*
372 * Mountd should never pass down a writeable V4ROOT export, but,
373 * just to make sure:
374 */
375 if (*flags & NFSEXP_V4ROOT)
376 *flags |= NFSEXP_READONLY;
377
378 /* There are two requirements on a filesystem to be exportable.
379 * 1: We must be able to identify the filesystem from a number.
380 * either a device number (so FS_REQUIRES_DEV needed)
381 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
382 * 2: We must be able to find an inode from a filehandle.
383 * This means that s_export_op must be set.
384 */
385 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
386 !(*flags & NFSEXP_FSID) &&
387 uuid == NULL) {
388 dprintk("exp_export: export of non-dev fs without fsid\n");
389 return -EINVAL;
390 }
391
392 if (!inode->i_sb->s_export_op ||
393 !inode->i_sb->s_export_op->fh_to_dentry) {
394 dprintk("exp_export: export of invalid fs type.\n");
395 return -EINVAL;
396 }
397
398 return 0;
399
400 }
401
402 #ifdef CONFIG_NFSD_V4
403
404 static int
405 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
406 {
407 int len;
408 int migrated, i, err;
409
410 /* listsize */
411 err = get_int(mesg, &fsloc->locations_count);
412 if (err)
413 return err;
414 if (fsloc->locations_count > MAX_FS_LOCATIONS)
415 return -EINVAL;
416 if (fsloc->locations_count == 0)
417 return 0;
418
419 fsloc->locations = kzalloc(fsloc->locations_count
420 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
421 if (!fsloc->locations)
422 return -ENOMEM;
423 for (i=0; i < fsloc->locations_count; i++) {
424 /* colon separated host list */
425 err = -EINVAL;
426 len = qword_get(mesg, buf, PAGE_SIZE);
427 if (len <= 0)
428 goto out_free_all;
429 err = -ENOMEM;
430 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
431 if (!fsloc->locations[i].hosts)
432 goto out_free_all;
433 err = -EINVAL;
434 /* slash separated path component list */
435 len = qword_get(mesg, buf, PAGE_SIZE);
436 if (len <= 0)
437 goto out_free_all;
438 err = -ENOMEM;
439 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
440 if (!fsloc->locations[i].path)
441 goto out_free_all;
442 }
443 /* migrated */
444 err = get_int(mesg, &migrated);
445 if (err)
446 goto out_free_all;
447 err = -EINVAL;
448 if (migrated < 0 || migrated > 1)
449 goto out_free_all;
450 fsloc->migrated = migrated;
451 return 0;
452 out_free_all:
453 nfsd4_fslocs_free(fsloc);
454 return err;
455 }
456
457 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
458 {
459 int listsize, err;
460 struct exp_flavor_info *f;
461
462 err = get_int(mesg, &listsize);
463 if (err)
464 return err;
465 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
466 return -EINVAL;
467
468 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
469 err = get_int(mesg, &f->pseudoflavor);
470 if (err)
471 return err;
472 /*
473 * XXX: It would be nice to also check whether this
474 * pseudoflavor is supported, so we can discover the
475 * problem at export time instead of when a client fails
476 * to authenticate.
477 */
478 err = get_int(mesg, &f->flags);
479 if (err)
480 return err;
481 /* Only some flags are allowed to differ between flavors: */
482 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
483 return -EINVAL;
484 }
485 exp->ex_nflavors = listsize;
486 return 0;
487 }
488
489 #else /* CONFIG_NFSD_V4 */
490 static inline int
491 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
492 static inline int
493 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
494 #endif
495
496 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
497 {
498 /* client path expiry [flags anonuid anongid fsid] */
499 char *buf;
500 int len;
501 int err;
502 struct auth_domain *dom = NULL;
503 struct svc_export exp = {}, *expp;
504 int an_int;
505
506 if (mesg[mlen-1] != '\n')
507 return -EINVAL;
508 mesg[mlen-1] = 0;
509
510 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
511 if (!buf)
512 return -ENOMEM;
513
514 /* client */
515 err = -EINVAL;
516 len = qword_get(&mesg, buf, PAGE_SIZE);
517 if (len <= 0)
518 goto out;
519
520 err = -ENOENT;
521 dom = auth_domain_find(buf);
522 if (!dom)
523 goto out;
524
525 /* path */
526 err = -EINVAL;
527 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
528 goto out1;
529
530 err = kern_path(buf, 0, &exp.ex_path);
531 if (err)
532 goto out1;
533
534 exp.ex_client = dom;
535
536 err = -ENOMEM;
537 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
538 if (!exp.ex_pathname)
539 goto out2;
540
541 /* expiry */
542 err = -EINVAL;
543 exp.h.expiry_time = get_expiry(&mesg);
544 if (exp.h.expiry_time == 0)
545 goto out3;
546
547 /* flags */
548 err = get_int(&mesg, &an_int);
549 if (err == -ENOENT) {
550 err = 0;
551 set_bit(CACHE_NEGATIVE, &exp.h.flags);
552 } else {
553 if (err || an_int < 0)
554 goto out3;
555 exp.ex_flags= an_int;
556
557 /* anon uid */
558 err = get_int(&mesg, &an_int);
559 if (err)
560 goto out3;
561 exp.ex_anon_uid= an_int;
562
563 /* anon gid */
564 err = get_int(&mesg, &an_int);
565 if (err)
566 goto out3;
567 exp.ex_anon_gid= an_int;
568
569 /* fsid */
570 err = get_int(&mesg, &an_int);
571 if (err)
572 goto out3;
573 exp.ex_fsid = an_int;
574
575 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
576 if (strcmp(buf, "fsloc") == 0)
577 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
578 else if (strcmp(buf, "uuid") == 0) {
579 /* expect a 16 byte uuid encoded as \xXXXX... */
580 len = qword_get(&mesg, buf, PAGE_SIZE);
581 if (len != 16)
582 err = -EINVAL;
583 else {
584 exp.ex_uuid =
585 kmemdup(buf, 16, GFP_KERNEL);
586 if (exp.ex_uuid == NULL)
587 err = -ENOMEM;
588 }
589 } else if (strcmp(buf, "secinfo") == 0)
590 err = secinfo_parse(&mesg, buf, &exp);
591 else
592 /* quietly ignore unknown words and anything
593 * following. Newer user-space can try to set
594 * new values, then see what the result was.
595 */
596 break;
597 if (err)
598 goto out4;
599 }
600
601 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
602 exp.ex_uuid);
603 if (err)
604 goto out4;
605 }
606
607 expp = svc_export_lookup(&exp);
608 if (expp)
609 expp = svc_export_update(&exp, expp);
610 else
611 err = -ENOMEM;
612 cache_flush();
613 if (expp == NULL)
614 err = -ENOMEM;
615 else
616 exp_put(expp);
617 out4:
618 nfsd4_fslocs_free(&exp.ex_fslocs);
619 kfree(exp.ex_uuid);
620 out3:
621 kfree(exp.ex_pathname);
622 out2:
623 path_put(&exp.ex_path);
624 out1:
625 auth_domain_put(dom);
626 out:
627 kfree(buf);
628 return err;
629 }
630
631 static void exp_flags(struct seq_file *m, int flag, int fsid,
632 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
633 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
634
635 static int svc_export_show(struct seq_file *m,
636 struct cache_detail *cd,
637 struct cache_head *h)
638 {
639 struct svc_export *exp ;
640
641 if (h ==NULL) {
642 seq_puts(m, "#path domain(flags)\n");
643 return 0;
644 }
645 exp = container_of(h, struct svc_export, h);
646 seq_path(m, &exp->ex_path, " \t\n\\");
647 seq_putc(m, '\t');
648 seq_escape(m, exp->ex_client->name, " \t\n\\");
649 seq_putc(m, '(');
650 if (test_bit(CACHE_VALID, &h->flags) &&
651 !test_bit(CACHE_NEGATIVE, &h->flags)) {
652 exp_flags(m, exp->ex_flags, exp->ex_fsid,
653 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
654 if (exp->ex_uuid) {
655 int i;
656 seq_puts(m, ",uuid=");
657 for (i=0; i<16; i++) {
658 if ((i&3) == 0 && i)
659 seq_putc(m, ':');
660 seq_printf(m, "%02x", exp->ex_uuid[i]);
661 }
662 }
663 show_secinfo(m, exp);
664 }
665 seq_puts(m, ")\n");
666 return 0;
667 }
668 static int svc_export_match(struct cache_head *a, struct cache_head *b)
669 {
670 struct svc_export *orig = container_of(a, struct svc_export, h);
671 struct svc_export *new = container_of(b, struct svc_export, h);
672 return orig->ex_client == new->ex_client &&
673 orig->ex_path.dentry == new->ex_path.dentry &&
674 orig->ex_path.mnt == new->ex_path.mnt;
675 }
676
677 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
678 {
679 struct svc_export *new = container_of(cnew, struct svc_export, h);
680 struct svc_export *item = container_of(citem, struct svc_export, h);
681
682 kref_get(&item->ex_client->ref);
683 new->ex_client = item->ex_client;
684 new->ex_path.dentry = dget(item->ex_path.dentry);
685 new->ex_path.mnt = mntget(item->ex_path.mnt);
686 new->ex_pathname = NULL;
687 new->ex_fslocs.locations = NULL;
688 new->ex_fslocs.locations_count = 0;
689 new->ex_fslocs.migrated = 0;
690 }
691
692 static void export_update(struct cache_head *cnew, struct cache_head *citem)
693 {
694 struct svc_export *new = container_of(cnew, struct svc_export, h);
695 struct svc_export *item = container_of(citem, struct svc_export, h);
696 int i;
697
698 new->ex_flags = item->ex_flags;
699 new->ex_anon_uid = item->ex_anon_uid;
700 new->ex_anon_gid = item->ex_anon_gid;
701 new->ex_fsid = item->ex_fsid;
702 new->ex_uuid = item->ex_uuid;
703 item->ex_uuid = NULL;
704 new->ex_pathname = item->ex_pathname;
705 item->ex_pathname = NULL;
706 new->ex_fslocs.locations = item->ex_fslocs.locations;
707 item->ex_fslocs.locations = NULL;
708 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
709 item->ex_fslocs.locations_count = 0;
710 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
711 item->ex_fslocs.migrated = 0;
712 new->ex_nflavors = item->ex_nflavors;
713 for (i = 0; i < MAX_SECINFO_LIST; i++) {
714 new->ex_flavors[i] = item->ex_flavors[i];
715 }
716 }
717
718 static struct cache_head *svc_export_alloc(void)
719 {
720 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
721 if (i)
722 return &i->h;
723 else
724 return NULL;
725 }
726
727 struct cache_detail svc_export_cache = {
728 .owner = THIS_MODULE,
729 .hash_size = EXPORT_HASHMAX,
730 .hash_table = export_table,
731 .name = "nfsd.export",
732 .cache_put = svc_export_put,
733 .cache_upcall = svc_export_upcall,
734 .cache_parse = svc_export_parse,
735 .cache_show = svc_export_show,
736 .match = svc_export_match,
737 .init = svc_export_init,
738 .update = export_update,
739 .alloc = svc_export_alloc,
740 };
741
742 static int
743 svc_export_hash(struct svc_export *exp)
744 {
745 int hash;
746
747 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
749 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
750 return hash;
751 }
752
753 static struct svc_export *
754 svc_export_lookup(struct svc_export *exp)
755 {
756 struct cache_head *ch;
757 int hash = svc_export_hash(exp);
758
759 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
760 hash);
761 if (ch)
762 return container_of(ch, struct svc_export, h);
763 else
764 return NULL;
765 }
766
767 static struct svc_export *
768 svc_export_update(struct svc_export *new, struct svc_export *old)
769 {
770 struct cache_head *ch;
771 int hash = svc_export_hash(old);
772
773 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
774 &old->h,
775 hash);
776 if (ch)
777 return container_of(ch, struct svc_export, h);
778 else
779 return NULL;
780 }
781
782
783 static struct svc_expkey *
784 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
785 {
786 struct svc_expkey key, *ek;
787 int err;
788
789 if (!clp)
790 return ERR_PTR(-ENOENT);
791
792 key.ek_client = clp;
793 key.ek_fsidtype = fsid_type;
794 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
795
796 ek = svc_expkey_lookup(&key);
797 if (ek == NULL)
798 return ERR_PTR(-ENOMEM);
799 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
800 if (err)
801 return ERR_PTR(err);
802 return ek;
803 }
804
805 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
806 struct svc_export *exp)
807 {
808 struct svc_expkey key, *ek;
809
810 key.ek_client = clp;
811 key.ek_fsidtype = fsid_type;
812 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
813 key.ek_path = exp->ex_path;
814 key.h.expiry_time = NEVER;
815 key.h.flags = 0;
816
817 ek = svc_expkey_lookup(&key);
818 if (ek)
819 ek = svc_expkey_update(&key,ek);
820 if (ek) {
821 cache_put(&ek->h, &svc_expkey_cache);
822 return 0;
823 }
824 return -ENOMEM;
825 }
826
827 /*
828 * Find the client's export entry matching xdev/xino.
829 */
830 static inline struct svc_expkey *
831 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
832 {
833 u32 fsidv[3];
834
835 if (old_valid_dev(dev)) {
836 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
837 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
838 }
839 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
840 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
841 }
842
843 /*
844 * Find the client's export entry matching fsid
845 */
846 static inline struct svc_expkey *
847 exp_get_fsid_key(svc_client *clp, int fsid)
848 {
849 u32 fsidv[2];
850
851 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
852
853 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
854 }
855
856 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
857 struct cache_req *reqp)
858 {
859 struct svc_export *exp, key;
860 int err;
861
862 if (!clp)
863 return ERR_PTR(-ENOENT);
864
865 key.ex_client = clp;
866 key.ex_path = *path;
867
868 exp = svc_export_lookup(&key);
869 if (exp == NULL)
870 return ERR_PTR(-ENOMEM);
871 err = cache_check(&svc_export_cache, &exp->h, reqp);
872 if (err)
873 return ERR_PTR(err);
874 return exp;
875 }
876
877 /*
878 * Find the export entry for a given dentry.
879 */
880 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
881 {
882 struct dentry *saved = dget(path->dentry);
883 svc_export *exp = exp_get_by_name(clp, path, NULL);
884
885 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
886 struct dentry *parent = dget_parent(path->dentry);
887 dput(path->dentry);
888 path->dentry = parent;
889 exp = exp_get_by_name(clp, path, NULL);
890 }
891 dput(path->dentry);
892 path->dentry = saved;
893 return exp;
894 }
895
896 /*
897 * Hashtable locking. Write locks are placed only by user processes
898 * wanting to modify export information.
899 * Write locking only done in this file. Read locking
900 * needed externally.
901 */
902
903 static DECLARE_RWSEM(hash_sem);
904
905 void
906 exp_readlock(void)
907 {
908 down_read(&hash_sem);
909 }
910
911 static inline void
912 exp_writelock(void)
913 {
914 down_write(&hash_sem);
915 }
916
917 void
918 exp_readunlock(void)
919 {
920 up_read(&hash_sem);
921 }
922
923 static inline void
924 exp_writeunlock(void)
925 {
926 up_write(&hash_sem);
927 }
928
929 static void exp_fsid_unhash(struct svc_export *exp)
930 {
931 struct svc_expkey *ek;
932
933 if ((exp->ex_flags & NFSEXP_FSID) == 0)
934 return;
935
936 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
937 if (!IS_ERR(ek)) {
938 ek->h.expiry_time = get_seconds()-1;
939 cache_put(&ek->h, &svc_expkey_cache);
940 }
941 svc_expkey_cache.nextcheck = get_seconds();
942 }
943
944 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
945 {
946 u32 fsid[2];
947
948 if ((exp->ex_flags & NFSEXP_FSID) == 0)
949 return 0;
950
951 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
952 return exp_set_key(clp, FSID_NUM, fsid, exp);
953 }
954
955 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
956 {
957 u32 fsid[2];
958 struct inode *inode = exp->ex_path.dentry->d_inode;
959 dev_t dev = inode->i_sb->s_dev;
960
961 if (old_valid_dev(dev)) {
962 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
963 return exp_set_key(clp, FSID_DEV, fsid, exp);
964 }
965 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
966 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
967 }
968
969 static void exp_unhash(struct svc_export *exp)
970 {
971 struct svc_expkey *ek;
972 struct inode *inode = exp->ex_path.dentry->d_inode;
973
974 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
975 if (!IS_ERR(ek)) {
976 ek->h.expiry_time = get_seconds()-1;
977 cache_put(&ek->h, &svc_expkey_cache);
978 }
979 svc_expkey_cache.nextcheck = get_seconds();
980 }
981
982 /*
983 * Export a file system.
984 */
985 int
986 exp_export(struct nfsctl_export *nxp)
987 {
988 svc_client *clp;
989 struct svc_export *exp = NULL;
990 struct svc_export new;
991 struct svc_expkey *fsid_key = NULL;
992 struct path path;
993 int err;
994
995 /* Consistency check */
996 err = -EINVAL;
997 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
998 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
999 goto out;
1000
1001 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1002 nxp->ex_client, nxp->ex_path,
1003 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1004 nxp->ex_flags);
1005
1006 /* Try to lock the export table for update */
1007 exp_writelock();
1008
1009 /* Look up client info */
1010 if (!(clp = auth_domain_find(nxp->ex_client)))
1011 goto out_unlock;
1012
1013
1014 /* Look up the dentry */
1015 err = kern_path(nxp->ex_path, 0, &path);
1016 if (err)
1017 goto out_put_clp;
1018 err = -EINVAL;
1019
1020 exp = exp_get_by_name(clp, &path, NULL);
1021
1022 memset(&new, 0, sizeof(new));
1023
1024 /* must make sure there won't be an ex_fsid clash */
1025 if ((nxp->ex_flags & NFSEXP_FSID) &&
1026 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1027 fsid_key->ek_path.mnt &&
1028 (fsid_key->ek_path.mnt != path.mnt ||
1029 fsid_key->ek_path.dentry != path.dentry))
1030 goto finish;
1031
1032 if (!IS_ERR(exp)) {
1033 /* just a flags/id/fsid update */
1034
1035 exp_fsid_unhash(exp);
1036 exp->ex_flags = nxp->ex_flags;
1037 exp->ex_anon_uid = nxp->ex_anon_uid;
1038 exp->ex_anon_gid = nxp->ex_anon_gid;
1039 exp->ex_fsid = nxp->ex_dev;
1040
1041 err = exp_fsid_hash(clp, exp);
1042 goto finish;
1043 }
1044
1045 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1046 if (err) goto finish;
1047
1048 err = -ENOMEM;
1049
1050 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1051
1052 new.h.expiry_time = NEVER;
1053 new.h.flags = 0;
1054 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1055 if (!new.ex_pathname)
1056 goto finish;
1057 new.ex_client = clp;
1058 new.ex_path = path;
1059 new.ex_flags = nxp->ex_flags;
1060 new.ex_anon_uid = nxp->ex_anon_uid;
1061 new.ex_anon_gid = nxp->ex_anon_gid;
1062 new.ex_fsid = nxp->ex_dev;
1063
1064 exp = svc_export_lookup(&new);
1065 if (exp)
1066 exp = svc_export_update(&new, exp);
1067
1068 if (!exp)
1069 goto finish;
1070
1071 if (exp_hash(clp, exp) ||
1072 exp_fsid_hash(clp, exp)) {
1073 /* failed to create at least one index */
1074 exp_do_unexport(exp);
1075 cache_flush();
1076 } else
1077 err = 0;
1078 finish:
1079 kfree(new.ex_pathname);
1080 if (!IS_ERR_OR_NULL(exp))
1081 exp_put(exp);
1082 if (!IS_ERR_OR_NULL(fsid_key))
1083 cache_put(&fsid_key->h, &svc_expkey_cache);
1084 path_put(&path);
1085 out_put_clp:
1086 auth_domain_put(clp);
1087 out_unlock:
1088 exp_writeunlock();
1089 out:
1090 return err;
1091 }
1092
1093 /*
1094 * Unexport a file system. The export entry has already
1095 * been removed from the client's list of exported fs's.
1096 */
1097 static void
1098 exp_do_unexport(svc_export *unexp)
1099 {
1100 unexp->h.expiry_time = get_seconds()-1;
1101 svc_export_cache.nextcheck = get_seconds();
1102 exp_unhash(unexp);
1103 exp_fsid_unhash(unexp);
1104 }
1105
1106
1107 /*
1108 * unexport syscall.
1109 */
1110 int
1111 exp_unexport(struct nfsctl_export *nxp)
1112 {
1113 struct auth_domain *dom;
1114 svc_export *exp;
1115 struct path path;
1116 int err;
1117
1118 /* Consistency check */
1119 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1120 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1121 return -EINVAL;
1122
1123 exp_writelock();
1124
1125 err = -EINVAL;
1126 dom = auth_domain_find(nxp->ex_client);
1127 if (!dom) {
1128 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1129 goto out_unlock;
1130 }
1131
1132 err = kern_path(nxp->ex_path, 0, &path);
1133 if (err)
1134 goto out_domain;
1135
1136 err = -EINVAL;
1137 exp = exp_get_by_name(dom, &path, NULL);
1138 path_put(&path);
1139 if (IS_ERR(exp))
1140 goto out_domain;
1141
1142 exp_do_unexport(exp);
1143 exp_put(exp);
1144 err = 0;
1145
1146 out_domain:
1147 auth_domain_put(dom);
1148 cache_flush();
1149 out_unlock:
1150 exp_writeunlock();
1151 return err;
1152 }
1153
1154 /*
1155 * Obtain the root fh on behalf of a client.
1156 * This could be done in user space, but I feel that it adds some safety
1157 * since its harder to fool a kernel module than a user space program.
1158 */
1159 int
1160 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1161 {
1162 struct svc_export *exp;
1163 struct path path;
1164 struct inode *inode;
1165 struct svc_fh fh;
1166 int err;
1167
1168 err = -EPERM;
1169 /* NB: we probably ought to check that it's NUL-terminated */
1170 if (kern_path(name, 0, &path)) {
1171 printk("nfsd: exp_rootfh path not found %s", name);
1172 return err;
1173 }
1174 inode = path.dentry->d_inode;
1175
1176 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1177 name, path.dentry, clp->name,
1178 inode->i_sb->s_id, inode->i_ino);
1179 exp = exp_parent(clp, &path);
1180 if (IS_ERR(exp)) {
1181 err = PTR_ERR(exp);
1182 goto out;
1183 }
1184
1185 /*
1186 * fh must be initialized before calling fh_compose
1187 */
1188 fh_init(&fh, maxsize);
1189 if (fh_compose(&fh, exp, path.dentry, NULL))
1190 err = -EINVAL;
1191 else
1192 err = 0;
1193 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1194 fh_put(&fh);
1195 exp_put(exp);
1196 out:
1197 path_put(&path);
1198 return err;
1199 }
1200
1201 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1202 u32 *fsidv, struct cache_req *reqp)
1203 {
1204 struct svc_export *exp;
1205 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1206 if (IS_ERR(ek))
1207 return ERR_CAST(ek);
1208
1209 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1210 cache_put(&ek->h, &svc_expkey_cache);
1211
1212 if (IS_ERR(exp))
1213 return ERR_CAST(exp);
1214 return exp;
1215 }
1216
1217 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1218 {
1219 struct exp_flavor_info *f;
1220 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1221
1222 /* legacy gss-only clients are always OK: */
1223 if (exp->ex_client == rqstp->rq_gssclient)
1224 return 0;
1225 /* ip-address based client; check sec= export option: */
1226 for (f = exp->ex_flavors; f < end; f++) {
1227 if (f->pseudoflavor == rqstp->rq_flavor)
1228 return 0;
1229 }
1230 /* defaults in absence of sec= options: */
1231 if (exp->ex_nflavors == 0) {
1232 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1233 rqstp->rq_flavor == RPC_AUTH_UNIX)
1234 return 0;
1235 }
1236 return nfserr_wrongsec;
1237 }
1238
1239 /*
1240 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1241 * auth_unix client) if it's available and has secinfo information;
1242 * otherwise, will try to use rq_gssclient.
1243 *
1244 * Called from functions that handle requests; functions that do work on
1245 * behalf of mountd are passed a single client name to use, and should
1246 * use exp_get_by_name() or exp_find().
1247 */
1248 struct svc_export *
1249 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1250 {
1251 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1252
1253 if (rqstp->rq_client == NULL)
1254 goto gss;
1255
1256 /* First try the auth_unix client: */
1257 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1258 if (PTR_ERR(exp) == -ENOENT)
1259 goto gss;
1260 if (IS_ERR(exp))
1261 return exp;
1262 /* If it has secinfo, assume there are no gss/... clients */
1263 if (exp->ex_nflavors > 0)
1264 return exp;
1265 gss:
1266 /* Otherwise, try falling back on gss client */
1267 if (rqstp->rq_gssclient == NULL)
1268 return exp;
1269 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1270 if (PTR_ERR(gssexp) == -ENOENT)
1271 return exp;
1272 if (!IS_ERR(exp))
1273 exp_put(exp);
1274 return gssexp;
1275 }
1276
1277 struct svc_export *
1278 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1279 {
1280 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1281
1282 if (rqstp->rq_client == NULL)
1283 goto gss;
1284
1285 /* First try the auth_unix client: */
1286 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1287 if (PTR_ERR(exp) == -ENOENT)
1288 goto gss;
1289 if (IS_ERR(exp))
1290 return exp;
1291 /* If it has secinfo, assume there are no gss/... clients */
1292 if (exp->ex_nflavors > 0)
1293 return exp;
1294 gss:
1295 /* Otherwise, try falling back on gss client */
1296 if (rqstp->rq_gssclient == NULL)
1297 return exp;
1298 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1299 &rqstp->rq_chandle);
1300 if (PTR_ERR(gssexp) == -ENOENT)
1301 return exp;
1302 if (!IS_ERR(exp))
1303 exp_put(exp);
1304 return gssexp;
1305 }
1306
1307 struct svc_export *
1308 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1309 {
1310 struct dentry *saved = dget(path->dentry);
1311 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1312
1313 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1314 struct dentry *parent = dget_parent(path->dentry);
1315 dput(path->dentry);
1316 path->dentry = parent;
1317 exp = rqst_exp_get_by_name(rqstp, path);
1318 }
1319 dput(path->dentry);
1320 path->dentry = saved;
1321 return exp;
1322 }
1323
1324 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1325 {
1326 u32 fsidv[2];
1327
1328 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1329
1330 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1331 }
1332
1333 /*
1334 * Called when we need the filehandle for the root of the pseudofs,
1335 * for a given NFSv4 client. The root is defined to be the
1336 * export point with fsid==0
1337 */
1338 __be32
1339 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1340 {
1341 struct svc_export *exp;
1342 __be32 rv;
1343
1344 exp = find_fsidzero_export(rqstp);
1345 if (IS_ERR(exp))
1346 return nfserrno(PTR_ERR(exp));
1347 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1348 if (rv)
1349 goto out;
1350 rv = check_nfsd_access(exp, rqstp);
1351 if (rv)
1352 fh_put(fhp);
1353 out:
1354 exp_put(exp);
1355 return rv;
1356 }
1357
1358 /* Iterator */
1359
1360 static void *e_start(struct seq_file *m, loff_t *pos)
1361 __acquires(svc_export_cache.hash_lock)
1362 {
1363 loff_t n = *pos;
1364 unsigned hash, export;
1365 struct cache_head *ch;
1366
1367 exp_readlock();
1368 read_lock(&svc_export_cache.hash_lock);
1369 if (!n--)
1370 return SEQ_START_TOKEN;
1371 hash = n >> 32;
1372 export = n & ((1LL<<32) - 1);
1373
1374
1375 for (ch=export_table[hash]; ch; ch=ch->next)
1376 if (!export--)
1377 return ch;
1378 n &= ~((1LL<<32) - 1);
1379 do {
1380 hash++;
1381 n += 1LL<<32;
1382 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1383 if (hash >= EXPORT_HASHMAX)
1384 return NULL;
1385 *pos = n+1;
1386 return export_table[hash];
1387 }
1388
1389 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1390 {
1391 struct cache_head *ch = p;
1392 int hash = (*pos >> 32);
1393
1394 if (p == SEQ_START_TOKEN)
1395 hash = 0;
1396 else if (ch->next == NULL) {
1397 hash++;
1398 *pos += 1LL<<32;
1399 } else {
1400 ++*pos;
1401 return ch->next;
1402 }
1403 *pos &= ~((1LL<<32) - 1);
1404 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1405 hash++;
1406 *pos += 1LL<<32;
1407 }
1408 if (hash >= EXPORT_HASHMAX)
1409 return NULL;
1410 ++*pos;
1411 return export_table[hash];
1412 }
1413
1414 static void e_stop(struct seq_file *m, void *p)
1415 __releases(svc_export_cache.hash_lock)
1416 {
1417 read_unlock(&svc_export_cache.hash_lock);
1418 exp_readunlock();
1419 }
1420
1421 static struct flags {
1422 int flag;
1423 char *name[2];
1424 } expflags[] = {
1425 { NFSEXP_READONLY, {"ro", "rw"}},
1426 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1427 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1428 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1429 { NFSEXP_ASYNC, {"async", "sync"}},
1430 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1431 { NFSEXP_NOHIDE, {"nohide", ""}},
1432 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1433 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1434 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1435 { NFSEXP_V4ROOT, {"v4root", ""}},
1436 #ifdef MSNFS
1437 { NFSEXP_MSNFS, {"msnfs", ""}},
1438 #endif
1439 { 0, {"", ""}}
1440 };
1441
1442 static void show_expflags(struct seq_file *m, int flags, int mask)
1443 {
1444 struct flags *flg;
1445 int state, first = 0;
1446
1447 for (flg = expflags; flg->flag; flg++) {
1448 if (flg->flag & ~mask)
1449 continue;
1450 state = (flg->flag & flags) ? 0 : 1;
1451 if (*flg->name[state])
1452 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1453 }
1454 }
1455
1456 static void show_secinfo_flags(struct seq_file *m, int flags)
1457 {
1458 seq_printf(m, ",");
1459 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1460 }
1461
1462 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1463 {
1464 struct exp_flavor_info *f;
1465 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1466 int lastflags = 0, first = 0;
1467
1468 if (exp->ex_nflavors == 0)
1469 return;
1470 for (f = exp->ex_flavors; f < end; f++) {
1471 if (first || f->flags != lastflags) {
1472 if (!first)
1473 show_secinfo_flags(m, lastflags);
1474 seq_printf(m, ",sec=%d", f->pseudoflavor);
1475 lastflags = f->flags;
1476 } else {
1477 seq_printf(m, ":%d", f->pseudoflavor);
1478 }
1479 }
1480 show_secinfo_flags(m, lastflags);
1481 }
1482
1483 static void exp_flags(struct seq_file *m, int flag, int fsid,
1484 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1485 {
1486 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1487 if (flag & NFSEXP_FSID)
1488 seq_printf(m, ",fsid=%d", fsid);
1489 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1490 seq_printf(m, ",anonuid=%u", anonu);
1491 if (anong != (gid_t)-2 && anong != (0x10000-2))
1492 seq_printf(m, ",anongid=%u", anong);
1493 if (fsloc && fsloc->locations_count > 0) {
1494 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1495 int i;
1496
1497 seq_printf(m, ",%s=", loctype);
1498 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1499 seq_putc(m, '@');
1500 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1501 for (i = 1; i < fsloc->locations_count; i++) {
1502 seq_putc(m, ';');
1503 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1504 seq_putc(m, '@');
1505 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1506 }
1507 }
1508 }
1509
1510 static int e_show(struct seq_file *m, void *p)
1511 {
1512 struct cache_head *cp = p;
1513 struct svc_export *exp = container_of(cp, struct svc_export, h);
1514
1515 if (p == SEQ_START_TOKEN) {
1516 seq_puts(m, "# Version 1.1\n");
1517 seq_puts(m, "# Path Client(Flags) # IPs\n");
1518 return 0;
1519 }
1520
1521 cache_get(&exp->h);
1522 if (cache_check(&svc_export_cache, &exp->h, NULL))
1523 return 0;
1524 cache_put(&exp->h, &svc_export_cache);
1525 return svc_export_show(m, &svc_export_cache, cp);
1526 }
1527
1528 const struct seq_operations nfs_exports_op = {
1529 .start = e_start,
1530 .next = e_next,
1531 .stop = e_stop,
1532 .show = e_show,
1533 };
1534
1535 /*
1536 * Add or modify a client.
1537 * Change requests may involve the list of host addresses. The list of
1538 * exports and possibly existing uid maps are left untouched.
1539 */
1540 int
1541 exp_addclient(struct nfsctl_client *ncp)
1542 {
1543 struct auth_domain *dom;
1544 int i, err;
1545 struct in6_addr addr6;
1546
1547 /* First, consistency check. */
1548 err = -EINVAL;
1549 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1550 goto out;
1551 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1552 goto out;
1553
1554 /* Lock the hashtable */
1555 exp_writelock();
1556
1557 dom = unix_domain_find(ncp->cl_ident);
1558
1559 err = -ENOMEM;
1560 if (!dom)
1561 goto out_unlock;
1562
1563 /* Insert client into hashtable. */
1564 for (i = 0; i < ncp->cl_naddr; i++) {
1565 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1566 auth_unix_add_addr(&addr6, dom);
1567 }
1568 auth_unix_forget_old(dom);
1569 auth_domain_put(dom);
1570
1571 err = 0;
1572
1573 out_unlock:
1574 exp_writeunlock();
1575 out:
1576 return err;
1577 }
1578
1579 /*
1580 * Delete a client given an identifier.
1581 */
1582 int
1583 exp_delclient(struct nfsctl_client *ncp)
1584 {
1585 int err;
1586 struct auth_domain *dom;
1587
1588 err = -EINVAL;
1589 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1590 goto out;
1591
1592 /* Lock the hashtable */
1593 exp_writelock();
1594
1595 dom = auth_domain_find(ncp->cl_ident);
1596 /* just make sure that no addresses work
1597 * and that it will expire soon
1598 */
1599 if (dom) {
1600 err = auth_unix_forget_old(dom);
1601 auth_domain_put(dom);
1602 }
1603
1604 exp_writeunlock();
1605 out:
1606 return err;
1607 }
1608
1609 /*
1610 * Verify that string is non-empty and does not exceed max length.
1611 */
1612 static int
1613 exp_verify_string(char *cp, int max)
1614 {
1615 int i;
1616
1617 for (i = 0; i < max; i++)
1618 if (!cp[i])
1619 return i;
1620 cp[i] = 0;
1621 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1622 return 0;
1623 }
1624
1625 /*
1626 * Initialize the exports module.
1627 */
1628 int
1629 nfsd_export_init(void)
1630 {
1631 int rv;
1632 dprintk("nfsd: initializing export module.\n");
1633
1634 rv = cache_register(&svc_export_cache);
1635 if (rv)
1636 return rv;
1637 rv = cache_register(&svc_expkey_cache);
1638 if (rv)
1639 cache_unregister(&svc_export_cache);
1640 return rv;
1641
1642 }
1643
1644 /*
1645 * Flush exports table - called when last nfsd thread is killed
1646 */
1647 void
1648 nfsd_export_flush(void)
1649 {
1650 exp_writelock();
1651 cache_purge(&svc_expkey_cache);
1652 cache_purge(&svc_export_cache);
1653 exp_writeunlock();
1654 }
1655
1656 /*
1657 * Shutdown the exports module.
1658 */
1659 void
1660 nfsd_export_shutdown(void)
1661 {
1662
1663 dprintk("nfsd: shutting down export module.\n");
1664
1665 exp_writelock();
1666
1667 cache_unregister(&svc_expkey_cache);
1668 cache_unregister(&svc_export_cache);
1669 svcauth_unix_purge();
1670
1671 exp_writeunlock();
1672 dprintk("nfsd: export shutdown complete.\n");
1673 }
Linux kernel - Deliverables
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