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2fa61f003fff11a7cc937ccfd3888925d79d2e28
[deliverable/linux.git] / fs / nfsd / export.c
1 #define MSNFS /* HACK HACK */
2 /*
3 * linux/fs/nfsd/export.c
4 *
5 * NFS exporting and validation.
6 *
7 * We maintain a list of clients, each of which has a list of
8 * exports. To export an fs to a given client, you first have
9 * to create the client entry with NFSCTL_ADDCLIENT, which
10 * creates a client control block and adds it to the hash
11 * table. Then, you call NFSCTL_EXPORT for each fs.
12 *
13 *
14 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 */
16
17 #include <linux/unistd.h>
18 #include <linux/slab.h>
19 #include <linux/stat.h>
20 #include <linux/in.h>
21 #include <linux/seq_file.h>
22 #include <linux/syscalls.h>
23 #include <linux/rwsem.h>
24 #include <linux/dcache.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/hash.h>
28 #include <linux/module.h>
29 #include <linux/exportfs.h>
30
31 #include <linux/sunrpc/svc.h>
32 #include <linux/nfsd/nfsd.h>
33 #include <linux/nfsd/nfsfh.h>
34 #include <linux/nfsd/syscall.h>
35 #include <linux/lockd/bind.h>
36 #include <linux/sunrpc/msg_prot.h>
37 #include <linux/sunrpc/gss_api.h>
38 #include <net/ipv6.h>
39
40 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
41
42 typedef struct auth_domain svc_client;
43 typedef struct svc_export svc_export;
44
45 static void exp_do_unexport(svc_export *unexp);
46 static int exp_verify_string(char *cp, int max);
47
48 /*
49 * We have two caches.
50 * One maps client+vfsmnt+dentry to export options - the export map
51 * The other maps client+filehandle-fragment to export options. - the expkey map
52 *
53 * The export options are actually stored in the first map, and the
54 * second map contains a reference to the entry in the first map.
55 */
56
57 #define EXPKEY_HASHBITS 8
58 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
59 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
60 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
61
62 static void expkey_put(struct kref *ref)
63 {
64 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
65
66 if (test_bit(CACHE_VALID, &key->h.flags) &&
67 !test_bit(CACHE_NEGATIVE, &key->h.flags))
68 path_put(&key->ek_path);
69 auth_domain_put(key->ek_client);
70 kfree(key);
71 }
72
73 static void expkey_request(struct cache_detail *cd,
74 struct cache_head *h,
75 char **bpp, int *blen)
76 {
77 /* client fsidtype \xfsid */
78 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
79 char type[5];
80
81 qword_add(bpp, blen, ek->ek_client->name);
82 snprintf(type, 5, "%d", ek->ek_fsidtype);
83 qword_add(bpp, blen, type);
84 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
85 (*bpp)[-1] = '\n';
86 }
87
88 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
89 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
90 static struct cache_detail svc_expkey_cache;
91
92 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
93 {
94 /* client fsidtype fsid [path] */
95 char *buf;
96 int len;
97 struct auth_domain *dom = NULL;
98 int err;
99 int fsidtype;
100 char *ep;
101 struct svc_expkey key;
102 struct svc_expkey *ek;
103
104 if (mesg[mlen-1] != '\n')
105 return -EINVAL;
106 mesg[mlen-1] = 0;
107
108 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
109 err = -ENOMEM;
110 if (!buf) goto out;
111
112 err = -EINVAL;
113 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
114 goto out;
115
116 err = -ENOENT;
117 dom = auth_domain_find(buf);
118 if (!dom)
119 goto out;
120 dprintk("found domain %s\n", buf);
121
122 err = -EINVAL;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 fsidtype = simple_strtoul(buf, &ep, 10);
126 if (*ep)
127 goto out;
128 dprintk("found fsidtype %d\n", fsidtype);
129 if (key_len(fsidtype)==0) /* invalid type */
130 goto out;
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
132 goto out;
133 dprintk("found fsid length %d\n", len);
134 if (len != key_len(fsidtype))
135 goto out;
136
137 /* OK, we seem to have a valid key */
138 key.h.flags = 0;
139 key.h.expiry_time = get_expiry(&mesg);
140 if (key.h.expiry_time == 0)
141 goto out;
142
143 key.ek_client = dom;
144 key.ek_fsidtype = fsidtype;
145 memcpy(key.ek_fsid, buf, len);
146
147 ek = svc_expkey_lookup(&key);
148 err = -ENOMEM;
149 if (!ek)
150 goto out;
151
152 /* now we want a pathname, or empty meaning NEGATIVE */
153 err = -EINVAL;
154 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
155 goto out;
156 dprintk("Path seems to be <%s>\n", buf);
157 err = 0;
158 if (len == 0) {
159 set_bit(CACHE_NEGATIVE, &key.h.flags);
160 ek = svc_expkey_update(&key, ek);
161 if (ek)
162 cache_put(&ek->h, &svc_expkey_cache);
163 else err = -ENOMEM;
164 } else {
165 struct nameidata nd;
166 err = path_lookup(buf, 0, &nd);
167 if (err)
168 goto out;
169
170 dprintk("Found the path %s\n", buf);
171 key.ek_path = nd.path;
172
173 ek = svc_expkey_update(&key, ek);
174 if (ek)
175 cache_put(&ek->h, &svc_expkey_cache);
176 else
177 err = -ENOMEM;
178 path_put(&nd.path);
179 }
180 cache_flush();
181 out:
182 if (dom)
183 auth_domain_put(dom);
184 kfree(buf);
185 return err;
186 }
187
188 static int expkey_show(struct seq_file *m,
189 struct cache_detail *cd,
190 struct cache_head *h)
191 {
192 struct svc_expkey *ek ;
193 int i;
194
195 if (h ==NULL) {
196 seq_puts(m, "#domain fsidtype fsid [path]\n");
197 return 0;
198 }
199 ek = container_of(h, struct svc_expkey, h);
200 seq_printf(m, "%s %d 0x", ek->ek_client->name,
201 ek->ek_fsidtype);
202 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
203 seq_printf(m, "%08x", ek->ek_fsid[i]);
204 if (test_bit(CACHE_VALID, &h->flags) &&
205 !test_bit(CACHE_NEGATIVE, &h->flags)) {
206 seq_printf(m, " ");
207 seq_path(m, &ek->ek_path, "\\ \t\n");
208 }
209 seq_printf(m, "\n");
210 return 0;
211 }
212
213 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
214 {
215 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
216 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
217
218 if (orig->ek_fsidtype != new->ek_fsidtype ||
219 orig->ek_client != new->ek_client ||
220 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
221 return 0;
222 return 1;
223 }
224
225 static inline void expkey_init(struct cache_head *cnew,
226 struct cache_head *citem)
227 {
228 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
229 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
230
231 kref_get(&item->ek_client->ref);
232 new->ek_client = item->ek_client;
233 new->ek_fsidtype = item->ek_fsidtype;
234
235 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
236 }
237
238 static inline void expkey_update(struct cache_head *cnew,
239 struct cache_head *citem)
240 {
241 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
242 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
243
244 new->ek_path = item->ek_path;
245 path_get(&item->ek_path);
246 }
247
248 static struct cache_head *expkey_alloc(void)
249 {
250 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
251 if (i)
252 return &i->h;
253 else
254 return NULL;
255 }
256
257 static struct cache_detail svc_expkey_cache = {
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .hash_table = expkey_table,
261 .name = "nfsd.fh",
262 .cache_put = expkey_put,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
270 };
271
272 static struct svc_expkey *
273 svc_expkey_lookup(struct svc_expkey *item)
274 {
275 struct cache_head *ch;
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
283
284 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
285 hash);
286 if (ch)
287 return container_of(ch, struct svc_expkey, h);
288 else
289 return NULL;
290 }
291
292 static struct svc_expkey *
293 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
294 {
295 struct cache_head *ch;
296 int hash = new->ek_fsidtype;
297 char * cp = (char*)new->ek_fsid;
298 int len = key_len(new->ek_fsidtype);
299
300 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
301 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
302 hash &= EXPKEY_HASHMASK;
303
304 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
305 &old->h, hash);
306 if (ch)
307 return container_of(ch, struct svc_expkey, h);
308 else
309 return NULL;
310 }
311
312
313 #define EXPORT_HASHBITS 8
314 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
315 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
316
317 static struct cache_head *export_table[EXPORT_HASHMAX];
318
319 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
320 {
321 int i;
322
323 for (i = 0; i < fsloc->locations_count; i++) {
324 kfree(fsloc->locations[i].path);
325 kfree(fsloc->locations[i].hosts);
326 }
327 kfree(fsloc->locations);
328 }
329
330 static void svc_export_put(struct kref *ref)
331 {
332 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
333 path_put(&exp->ex_path);
334 auth_domain_put(exp->ex_client);
335 kfree(exp->ex_pathname);
336 nfsd4_fslocs_free(&exp->ex_fslocs);
337 kfree(exp);
338 }
339
340 static void svc_export_request(struct cache_detail *cd,
341 struct cache_head *h,
342 char **bpp, int *blen)
343 {
344 /* client path */
345 struct svc_export *exp = container_of(h, struct svc_export, h);
346 char *pth;
347
348 qword_add(bpp, blen, exp->ex_client->name);
349 pth = d_path(&exp->ex_path, *bpp, *blen);
350 if (IS_ERR(pth)) {
351 /* is this correct? */
352 (*bpp)[0] = '\n';
353 return;
354 }
355 qword_add(bpp, blen, pth);
356 (*bpp)[-1] = '\n';
357 }
358
359 static struct svc_export *svc_export_update(struct svc_export *new,
360 struct svc_export *old);
361 static struct svc_export *svc_export_lookup(struct svc_export *);
362
363 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
364 {
365
366 /* We currently export only dirs and regular files.
367 * This is what umountd does.
368 */
369 if (!S_ISDIR(inode->i_mode) &&
370 !S_ISREG(inode->i_mode))
371 return -ENOTDIR;
372
373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
381 !(flags & NFSEXP_FSID) &&
382 uuid == NULL) {
383 dprintk("exp_export: export of non-dev fs without fsid\n");
384 return -EINVAL;
385 }
386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
393 return 0;
394
395 }
396
397 #ifdef CONFIG_NFSD_V4
398
399 static int
400 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401 {
402 int len;
403 int migrated, i, err;
404
405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447 out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450 }
451
452 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453 {
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
468 * Just a quick sanity check; we could also try to check
469 * whether this pseudoflavor is supported, but at worst
470 * an unsupported pseudoflavor on the export would just
471 * be a pseudoflavor that won't match the flavor of any
472 * authenticated request. The administrator will
473 * probably discover the problem when someone fails to
474 * authenticate.
475 */
476 if (f->pseudoflavor < 0)
477 return -EINVAL;
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_request = svc_export_request,
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 struct svc_export *
743 svc_export_lookup(struct svc_export *exp)
744 {
745 struct cache_head *ch;
746 int hash;
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
751 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
752 hash);
753 if (ch)
754 return container_of(ch, struct svc_export, h);
755 else
756 return NULL;
757 }
758
759 static struct svc_export *
760 svc_export_update(struct svc_export *new, struct svc_export *old)
761 {
762 struct cache_head *ch;
763 int hash;
764 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
765 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
766 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
767
768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
769 &old->h,
770 hash);
771 if (ch)
772 return container_of(ch, struct svc_export, h);
773 else
774 return NULL;
775 }
776
777
778 static struct svc_expkey *
779 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780 {
781 struct svc_expkey key, *ek;
782 int err;
783
784 if (!clp)
785 return ERR_PTR(-ENOENT);
786
787 key.ek_client = clp;
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790
791 ek = svc_expkey_lookup(&key);
792 if (ek == NULL)
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
795 if (err)
796 return ERR_PTR(err);
797 return ek;
798 }
799
800 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
801 struct svc_export *exp)
802 {
803 struct svc_expkey key, *ek;
804
805 key.ek_client = clp;
806 key.ek_fsidtype = fsid_type;
807 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
808 key.ek_path = exp->ex_path;
809 key.h.expiry_time = NEVER;
810 key.h.flags = 0;
811
812 ek = svc_expkey_lookup(&key);
813 if (ek)
814 ek = svc_expkey_update(&key,ek);
815 if (ek) {
816 cache_put(&ek->h, &svc_expkey_cache);
817 return 0;
818 }
819 return -ENOMEM;
820 }
821
822 /*
823 * Find the client's export entry matching xdev/xino.
824 */
825 static inline struct svc_expkey *
826 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
827 {
828 u32 fsidv[3];
829
830 if (old_valid_dev(dev)) {
831 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
832 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
833 }
834 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
835 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
836 }
837
838 /*
839 * Find the client's export entry matching fsid
840 */
841 static inline struct svc_expkey *
842 exp_get_fsid_key(svc_client *clp, int fsid)
843 {
844 u32 fsidv[2];
845
846 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
847
848 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
849 }
850
851 static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
852 struct dentry *dentry,
853 struct cache_req *reqp)
854 {
855 struct svc_export *exp, key;
856 int err;
857
858 if (!clp)
859 return ERR_PTR(-ENOENT);
860
861 key.ex_client = clp;
862 key.ex_path.mnt = mnt;
863 key.ex_path.dentry = dentry;
864
865 exp = svc_export_lookup(&key);
866 if (exp == NULL)
867 return ERR_PTR(-ENOMEM);
868 err = cache_check(&svc_export_cache, &exp->h, reqp);
869 if (err)
870 return ERR_PTR(err);
871 return exp;
872 }
873
874 /*
875 * Find the export entry for a given dentry.
876 */
877 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
878 struct dentry *dentry,
879 struct cache_req *reqp)
880 {
881 svc_export *exp;
882
883 dget(dentry);
884 exp = exp_get_by_name(clp, mnt, dentry, reqp);
885
886 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
887 struct dentry *parent;
888
889 parent = dget_parent(dentry);
890 dput(dentry);
891 dentry = parent;
892 exp = exp_get_by_name(clp, mnt, dentry, reqp);
893 }
894 dput(dentry);
895 return exp;
896 }
897
898 /*
899 * Hashtable locking. Write locks are placed only by user processes
900 * wanting to modify export information.
901 * Write locking only done in this file. Read locking
902 * needed externally.
903 */
904
905 static DECLARE_RWSEM(hash_sem);
906
907 void
908 exp_readlock(void)
909 {
910 down_read(&hash_sem);
911 }
912
913 static inline void
914 exp_writelock(void)
915 {
916 down_write(&hash_sem);
917 }
918
919 void
920 exp_readunlock(void)
921 {
922 up_read(&hash_sem);
923 }
924
925 static inline void
926 exp_writeunlock(void)
927 {
928 up_write(&hash_sem);
929 }
930
931 static void exp_fsid_unhash(struct svc_export *exp)
932 {
933 struct svc_expkey *ek;
934
935 if ((exp->ex_flags & NFSEXP_FSID) == 0)
936 return;
937
938 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
939 if (!IS_ERR(ek)) {
940 ek->h.expiry_time = get_seconds()-1;
941 cache_put(&ek->h, &svc_expkey_cache);
942 }
943 svc_expkey_cache.nextcheck = get_seconds();
944 }
945
946 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
947 {
948 u32 fsid[2];
949
950 if ((exp->ex_flags & NFSEXP_FSID) == 0)
951 return 0;
952
953 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
954 return exp_set_key(clp, FSID_NUM, fsid, exp);
955 }
956
957 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
958 {
959 u32 fsid[2];
960 struct inode *inode = exp->ex_path.dentry->d_inode;
961 dev_t dev = inode->i_sb->s_dev;
962
963 if (old_valid_dev(dev)) {
964 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
965 return exp_set_key(clp, FSID_DEV, fsid, exp);
966 }
967 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
968 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
969 }
970
971 static void exp_unhash(struct svc_export *exp)
972 {
973 struct svc_expkey *ek;
974 struct inode *inode = exp->ex_path.dentry->d_inode;
975
976 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
977 if (!IS_ERR(ek)) {
978 ek->h.expiry_time = get_seconds()-1;
979 cache_put(&ek->h, &svc_expkey_cache);
980 }
981 svc_expkey_cache.nextcheck = get_seconds();
982 }
983
984 /*
985 * Export a file system.
986 */
987 int
988 exp_export(struct nfsctl_export *nxp)
989 {
990 svc_client *clp;
991 struct svc_export *exp = NULL;
992 struct svc_export new;
993 struct svc_expkey *fsid_key = NULL;
994 struct nameidata nd;
995 int err;
996
997 /* Consistency check */
998 err = -EINVAL;
999 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1000 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1001 goto out;
1002
1003 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1004 nxp->ex_client, nxp->ex_path,
1005 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1006 nxp->ex_flags);
1007
1008 /* Try to lock the export table for update */
1009 exp_writelock();
1010
1011 /* Look up client info */
1012 if (!(clp = auth_domain_find(nxp->ex_client)))
1013 goto out_unlock;
1014
1015
1016 /* Look up the dentry */
1017 err = path_lookup(nxp->ex_path, 0, &nd);
1018 if (err)
1019 goto out_put_clp;
1020 err = -EINVAL;
1021
1022 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
1023
1024 memset(&new, 0, sizeof(new));
1025
1026 /* must make sure there won't be an ex_fsid clash */
1027 if ((nxp->ex_flags & NFSEXP_FSID) &&
1028 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1029 fsid_key->ek_path.mnt &&
1030 (fsid_key->ek_path.mnt != nd.path.mnt ||
1031 fsid_key->ek_path.dentry != nd.path.dentry))
1032 goto finish;
1033
1034 if (!IS_ERR(exp)) {
1035 /* just a flags/id/fsid update */
1036
1037 exp_fsid_unhash(exp);
1038 exp->ex_flags = nxp->ex_flags;
1039 exp->ex_anon_uid = nxp->ex_anon_uid;
1040 exp->ex_anon_gid = nxp->ex_anon_gid;
1041 exp->ex_fsid = nxp->ex_dev;
1042
1043 err = exp_fsid_hash(clp, exp);
1044 goto finish;
1045 }
1046
1047 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
1048 if (err) goto finish;
1049
1050 err = -ENOMEM;
1051
1052 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1053
1054 new.h.expiry_time = NEVER;
1055 new.h.flags = 0;
1056 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1057 if (!new.ex_pathname)
1058 goto finish;
1059 new.ex_client = clp;
1060 new.ex_path = nd.path;
1061 new.ex_flags = nxp->ex_flags;
1062 new.ex_anon_uid = nxp->ex_anon_uid;
1063 new.ex_anon_gid = nxp->ex_anon_gid;
1064 new.ex_fsid = nxp->ex_dev;
1065
1066 exp = svc_export_lookup(&new);
1067 if (exp)
1068 exp = svc_export_update(&new, exp);
1069
1070 if (!exp)
1071 goto finish;
1072
1073 if (exp_hash(clp, exp) ||
1074 exp_fsid_hash(clp, exp)) {
1075 /* failed to create at least one index */
1076 exp_do_unexport(exp);
1077 cache_flush();
1078 } else
1079 err = 0;
1080 finish:
1081 kfree(new.ex_pathname);
1082 if (exp)
1083 exp_put(exp);
1084 if (fsid_key && !IS_ERR(fsid_key))
1085 cache_put(&fsid_key->h, &svc_expkey_cache);
1086 path_put(&nd.path);
1087 out_put_clp:
1088 auth_domain_put(clp);
1089 out_unlock:
1090 exp_writeunlock();
1091 out:
1092 return err;
1093 }
1094
1095 /*
1096 * Unexport a file system. The export entry has already
1097 * been removed from the client's list of exported fs's.
1098 */
1099 static void
1100 exp_do_unexport(svc_export *unexp)
1101 {
1102 unexp->h.expiry_time = get_seconds()-1;
1103 svc_export_cache.nextcheck = get_seconds();
1104 exp_unhash(unexp);
1105 exp_fsid_unhash(unexp);
1106 }
1107
1108
1109 /*
1110 * unexport syscall.
1111 */
1112 int
1113 exp_unexport(struct nfsctl_export *nxp)
1114 {
1115 struct auth_domain *dom;
1116 svc_export *exp;
1117 struct nameidata nd;
1118 int err;
1119
1120 /* Consistency check */
1121 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1122 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1123 return -EINVAL;
1124
1125 exp_writelock();
1126
1127 err = -EINVAL;
1128 dom = auth_domain_find(nxp->ex_client);
1129 if (!dom) {
1130 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1131 goto out_unlock;
1132 }
1133
1134 err = path_lookup(nxp->ex_path, 0, &nd);
1135 if (err)
1136 goto out_domain;
1137
1138 err = -EINVAL;
1139 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
1140 path_put(&nd.path);
1141 if (IS_ERR(exp))
1142 goto out_domain;
1143
1144 exp_do_unexport(exp);
1145 exp_put(exp);
1146 err = 0;
1147
1148 out_domain:
1149 auth_domain_put(dom);
1150 cache_flush();
1151 out_unlock:
1152 exp_writeunlock();
1153 return err;
1154 }
1155
1156 /*
1157 * Obtain the root fh on behalf of a client.
1158 * This could be done in user space, but I feel that it adds some safety
1159 * since its harder to fool a kernel module than a user space program.
1160 */
1161 int
1162 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1163 {
1164 struct svc_export *exp;
1165 struct nameidata nd;
1166 struct inode *inode;
1167 struct svc_fh fh;
1168 int err;
1169
1170 err = -EPERM;
1171 /* NB: we probably ought to check that it's NUL-terminated */
1172 if (path_lookup(path, 0, &nd)) {
1173 printk("nfsd: exp_rootfh path not found %s", path);
1174 return err;
1175 }
1176 inode = nd.path.dentry->d_inode;
1177
1178 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1179 path, nd.path.dentry, clp->name,
1180 inode->i_sb->s_id, inode->i_ino);
1181 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
1182 if (IS_ERR(exp)) {
1183 err = PTR_ERR(exp);
1184 goto out;
1185 }
1186
1187 /*
1188 * fh must be initialized before calling fh_compose
1189 */
1190 fh_init(&fh, maxsize);
1191 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
1192 err = -EINVAL;
1193 else
1194 err = 0;
1195 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1196 fh_put(&fh);
1197 exp_put(exp);
1198 out:
1199 path_put(&nd.path);
1200 return err;
1201 }
1202
1203 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1204 u32 *fsidv, struct cache_req *reqp)
1205 {
1206 struct svc_export *exp;
1207 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1208 if (IS_ERR(ek))
1209 return ERR_CAST(ek);
1210
1211 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
1212 cache_put(&ek->h, &svc_expkey_cache);
1213
1214 if (IS_ERR(exp))
1215 return ERR_CAST(exp);
1216 return exp;
1217 }
1218
1219 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1220 {
1221 struct exp_flavor_info *f;
1222 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1223
1224 /* legacy gss-only clients are always OK: */
1225 if (exp->ex_client == rqstp->rq_gssclient)
1226 return 0;
1227 /* ip-address based client; check sec= export option: */
1228 for (f = exp->ex_flavors; f < end; f++) {
1229 if (f->pseudoflavor == rqstp->rq_flavor)
1230 return 0;
1231 }
1232 /* defaults in absence of sec= options: */
1233 if (exp->ex_nflavors == 0) {
1234 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1235 rqstp->rq_flavor == RPC_AUTH_UNIX)
1236 return 0;
1237 }
1238 return nfserr_wrongsec;
1239 }
1240
1241 /*
1242 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1243 * auth_unix client) if it's available and has secinfo information;
1244 * otherwise, will try to use rq_gssclient.
1245 *
1246 * Called from functions that handle requests; functions that do work on
1247 * behalf of mountd are passed a single client name to use, and should
1248 * use exp_get_by_name() or exp_find().
1249 */
1250 struct svc_export *
1251 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1252 struct dentry *dentry)
1253 {
1254 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1255
1256 if (rqstp->rq_client == NULL)
1257 goto gss;
1258
1259 /* First try the auth_unix client: */
1260 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1261 &rqstp->rq_chandle);
1262 if (PTR_ERR(exp) == -ENOENT)
1263 goto gss;
1264 if (IS_ERR(exp))
1265 return exp;
1266 /* If it has secinfo, assume there are no gss/... clients */
1267 if (exp->ex_nflavors > 0)
1268 return exp;
1269 gss:
1270 /* Otherwise, try falling back on gss client */
1271 if (rqstp->rq_gssclient == NULL)
1272 return exp;
1273 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1274 &rqstp->rq_chandle);
1275 if (PTR_ERR(gssexp) == -ENOENT)
1276 return exp;
1277 if (!IS_ERR(exp))
1278 exp_put(exp);
1279 return gssexp;
1280 }
1281
1282 struct svc_export *
1283 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1284 {
1285 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1286
1287 if (rqstp->rq_client == NULL)
1288 goto gss;
1289
1290 /* First try the auth_unix client: */
1291 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1292 if (PTR_ERR(exp) == -ENOENT)
1293 goto gss;
1294 if (IS_ERR(exp))
1295 return exp;
1296 /* If it has secinfo, assume there are no gss/... clients */
1297 if (exp->ex_nflavors > 0)
1298 return exp;
1299 gss:
1300 /* Otherwise, try falling back on gss client */
1301 if (rqstp->rq_gssclient == NULL)
1302 return exp;
1303 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1304 &rqstp->rq_chandle);
1305 if (PTR_ERR(gssexp) == -ENOENT)
1306 return exp;
1307 if (!IS_ERR(exp))
1308 exp_put(exp);
1309 return gssexp;
1310 }
1311
1312 struct svc_export *
1313 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1314 struct dentry *dentry)
1315 {
1316 struct svc_export *exp;
1317
1318 dget(dentry);
1319 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1320
1321 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1322 struct dentry *parent;
1323
1324 parent = dget_parent(dentry);
1325 dput(dentry);
1326 dentry = parent;
1327 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1328 }
1329 dput(dentry);
1330 return exp;
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 u32 fsidv[2];
1344
1345 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1346
1347 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1348 if (IS_ERR(exp))
1349 return nfserrno(PTR_ERR(exp));
1350 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1351 if (rv)
1352 goto out;
1353 rv = check_nfsd_access(exp, rqstp);
1354 out:
1355 exp_put(exp);
1356 return rv;
1357 }
1358
1359 /* Iterator */
1360
1361 static void *e_start(struct seq_file *m, loff_t *pos)
1362 __acquires(svc_export_cache.hash_lock)
1363 {
1364 loff_t n = *pos;
1365 unsigned hash, export;
1366 struct cache_head *ch;
1367
1368 exp_readlock();
1369 read_lock(&svc_export_cache.hash_lock);
1370 if (!n--)
1371 return SEQ_START_TOKEN;
1372 hash = n >> 32;
1373 export = n & ((1LL<<32) - 1);
1374
1375
1376 for (ch=export_table[hash]; ch; ch=ch->next)
1377 if (!export--)
1378 return ch;
1379 n &= ~((1LL<<32) - 1);
1380 do {
1381 hash++;
1382 n += 1LL<<32;
1383 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1384 if (hash >= EXPORT_HASHMAX)
1385 return NULL;
1386 *pos = n+1;
1387 return export_table[hash];
1388 }
1389
1390 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1391 {
1392 struct cache_head *ch = p;
1393 int hash = (*pos >> 32);
1394
1395 if (p == SEQ_START_TOKEN)
1396 hash = 0;
1397 else if (ch->next == NULL) {
1398 hash++;
1399 *pos += 1LL<<32;
1400 } else {
1401 ++*pos;
1402 return ch->next;
1403 }
1404 *pos &= ~((1LL<<32) - 1);
1405 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1406 hash++;
1407 *pos += 1LL<<32;
1408 }
1409 if (hash >= EXPORT_HASHMAX)
1410 return NULL;
1411 ++*pos;
1412 return export_table[hash];
1413 }
1414
1415 static void e_stop(struct seq_file *m, void *p)
1416 __releases(svc_export_cache.hash_lock)
1417 {
1418 read_unlock(&svc_export_cache.hash_lock);
1419 exp_readunlock();
1420 }
1421
1422 static struct flags {
1423 int flag;
1424 char *name[2];
1425 } expflags[] = {
1426 { NFSEXP_READONLY, {"ro", "rw"}},
1427 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1428 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1429 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1430 { NFSEXP_ASYNC, {"async", "sync"}},
1431 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1432 { NFSEXP_NOHIDE, {"nohide", ""}},
1433 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1434 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1435 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
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 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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