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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 = NULL;
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)
111 goto out;
112
113 err = -EINVAL;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116
117 err = -ENOENT;
118 dom = auth_domain_find(buf);
119 if (!dom)
120 goto out;
121 dprintk("found domain %s\n", buf);
122
123 err = -EINVAL;
124 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 goto out;
126 fsidtype = simple_strtoul(buf, &ep, 10);
127 if (*ep)
128 goto out;
129 dprintk("found fsidtype %d\n", fsidtype);
130 if (key_len(fsidtype)==0) /* invalid type */
131 goto out;
132 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 goto out;
134 dprintk("found fsid length %d\n", len);
135 if (len != key_len(fsidtype))
136 goto out;
137
138 /* OK, we seem to have a valid key */
139 key.h.flags = 0;
140 key.h.expiry_time = get_expiry(&mesg);
141 if (key.h.expiry_time == 0)
142 goto out;
143
144 key.ek_client = dom;
145 key.ek_fsidtype = fsidtype;
146 memcpy(key.ek_fsid, buf, len);
147
148 ek = svc_expkey_lookup(&key);
149 err = -ENOMEM;
150 if (!ek)
151 goto out;
152
153 /* now we want a pathname, or empty meaning NEGATIVE */
154 err = -EINVAL;
155 len = qword_get(&mesg, buf, PAGE_SIZE);
156 if (len < 0)
157 goto out;
158 dprintk("Path seems to be <%s>\n", buf);
159 err = 0;
160 if (len == 0) {
161 set_bit(CACHE_NEGATIVE, &key.h.flags);
162 ek = svc_expkey_update(&key, ek);
163 if (!ek)
164 err = -ENOMEM;
165 } else {
166 err = kern_path(buf, 0, &key.ek_path);
167 if (err)
168 goto out;
169
170 dprintk("Found the path %s\n", buf);
171
172 ek = svc_expkey_update(&key, ek);
173 if (!ek)
174 err = -ENOMEM;
175 path_put(&key.ek_path);
176 }
177 cache_flush();
178 out:
179 if (ek)
180 cache_put(&ek->h, &svc_expkey_cache);
181 if (dom)
182 auth_domain_put(dom);
183 kfree(buf);
184 return err;
185 }
186
187 static int expkey_show(struct seq_file *m,
188 struct cache_detail *cd,
189 struct cache_head *h)
190 {
191 struct svc_expkey *ek ;
192 int i;
193
194 if (h ==NULL) {
195 seq_puts(m, "#domain fsidtype fsid [path]\n");
196 return 0;
197 }
198 ek = container_of(h, struct svc_expkey, h);
199 seq_printf(m, "%s %d 0x", ek->ek_client->name,
200 ek->ek_fsidtype);
201 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
202 seq_printf(m, "%08x", ek->ek_fsid[i]);
203 if (test_bit(CACHE_VALID, &h->flags) &&
204 !test_bit(CACHE_NEGATIVE, &h->flags)) {
205 seq_printf(m, " ");
206 seq_path(m, &ek->ek_path, "\\ \t\n");
207 }
208 seq_printf(m, "\n");
209 return 0;
210 }
211
212 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
213 {
214 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
215 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
216
217 if (orig->ek_fsidtype != new->ek_fsidtype ||
218 orig->ek_client != new->ek_client ||
219 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
220 return 0;
221 return 1;
222 }
223
224 static inline void expkey_init(struct cache_head *cnew,
225 struct cache_head *citem)
226 {
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
230 kref_get(&item->ek_client->ref);
231 new->ek_client = item->ek_client;
232 new->ek_fsidtype = item->ek_fsidtype;
233
234 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
235 }
236
237 static inline void expkey_update(struct cache_head *cnew,
238 struct cache_head *citem)
239 {
240 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
241 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
242
243 new->ek_path = item->ek_path;
244 path_get(&item->ek_path);
245 }
246
247 static struct cache_head *expkey_alloc(void)
248 {
249 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
250 if (i)
251 return &i->h;
252 else
253 return NULL;
254 }
255
256 static struct cache_detail svc_expkey_cache = {
257 .owner = THIS_MODULE,
258 .hash_size = EXPKEY_HASHMAX,
259 .hash_table = expkey_table,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_request = expkey_request,
263 .cache_parse = expkey_parse,
264 .cache_show = expkey_show,
265 .match = expkey_match,
266 .init = expkey_init,
267 .update = expkey_update,
268 .alloc = expkey_alloc,
269 };
270
271 static struct svc_expkey *
272 svc_expkey_lookup(struct svc_expkey *item)
273 {
274 struct cache_head *ch;
275 int hash = item->ek_fsidtype;
276 char * cp = (char*)item->ek_fsid;
277 int len = key_len(item->ek_fsidtype);
278
279 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
280 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
281 hash &= EXPKEY_HASHMASK;
282
283 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
284 hash);
285 if (ch)
286 return container_of(ch, struct svc_expkey, h);
287 else
288 return NULL;
289 }
290
291 static struct svc_expkey *
292 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
293 {
294 struct cache_head *ch;
295 int hash = new->ek_fsidtype;
296 char * cp = (char*)new->ek_fsid;
297 int len = key_len(new->ek_fsidtype);
298
299 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
300 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
301 hash &= EXPKEY_HASHMASK;
302
303 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
304 &old->h, hash);
305 if (ch)
306 return container_of(ch, struct svc_expkey, h);
307 else
308 return NULL;
309 }
310
311
312 #define EXPORT_HASHBITS 8
313 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
314 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
315
316 static struct cache_head *export_table[EXPORT_HASHMAX];
317
318 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
319 {
320 int i;
321
322 for (i = 0; i < fsloc->locations_count; i++) {
323 kfree(fsloc->locations[i].path);
324 kfree(fsloc->locations[i].hosts);
325 }
326 kfree(fsloc->locations);
327 }
328
329 static void svc_export_put(struct kref *ref)
330 {
331 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
332 path_put(&exp->ex_path);
333 auth_domain_put(exp->ex_client);
334 kfree(exp->ex_pathname);
335 nfsd4_fslocs_free(&exp->ex_fslocs);
336 kfree(exp);
337 }
338
339 static void svc_export_request(struct cache_detail *cd,
340 struct cache_head *h,
341 char **bpp, int *blen)
342 {
343 /* client path */
344 struct svc_export *exp = container_of(h, struct svc_export, h);
345 char *pth;
346
347 qword_add(bpp, blen, exp->ex_client->name);
348 pth = d_path(&exp->ex_path, *bpp, *blen);
349 if (IS_ERR(pth)) {
350 /* is this correct? */
351 (*bpp)[0] = '\n';
352 return;
353 }
354 qword_add(bpp, blen, pth);
355 (*bpp)[-1] = '\n';
356 }
357
358 static struct svc_export *svc_export_update(struct svc_export *new,
359 struct svc_export *old);
360 static struct svc_export *svc_export_lookup(struct svc_export *);
361
362 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
363 {
364
365 /* We currently export only dirs and regular files.
366 * This is what umountd does.
367 */
368 if (!S_ISDIR(inode->i_mode) &&
369 !S_ISREG(inode->i_mode))
370 return -ENOTDIR;
371
372 /* There are two requirements on a filesystem to be exportable.
373 * 1: We must be able to identify the filesystem from a number.
374 * either a device number (so FS_REQUIRES_DEV needed)
375 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
376 * 2: We must be able to find an inode from a filehandle.
377 * This means that s_export_op must be set.
378 */
379 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
380 !(flags & NFSEXP_FSID) &&
381 uuid == NULL) {
382 dprintk("exp_export: export of non-dev fs without fsid\n");
383 return -EINVAL;
384 }
385
386 if (!inode->i_sb->s_export_op ||
387 !inode->i_sb->s_export_op->fh_to_dentry) {
388 dprintk("exp_export: export of invalid fs type.\n");
389 return -EINVAL;
390 }
391
392 return 0;
393
394 }
395
396 #ifdef CONFIG_NFSD_V4
397
398 static int
399 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
400 {
401 int len;
402 int migrated, i, err;
403
404 /* listsize */
405 err = get_int(mesg, &fsloc->locations_count);
406 if (err)
407 return err;
408 if (fsloc->locations_count > MAX_FS_LOCATIONS)
409 return -EINVAL;
410 if (fsloc->locations_count == 0)
411 return 0;
412
413 fsloc->locations = kzalloc(fsloc->locations_count
414 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
415 if (!fsloc->locations)
416 return -ENOMEM;
417 for (i=0; i < fsloc->locations_count; i++) {
418 /* colon separated host list */
419 err = -EINVAL;
420 len = qword_get(mesg, buf, PAGE_SIZE);
421 if (len <= 0)
422 goto out_free_all;
423 err = -ENOMEM;
424 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
425 if (!fsloc->locations[i].hosts)
426 goto out_free_all;
427 err = -EINVAL;
428 /* slash separated path component list */
429 len = qword_get(mesg, buf, PAGE_SIZE);
430 if (len <= 0)
431 goto out_free_all;
432 err = -ENOMEM;
433 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
434 if (!fsloc->locations[i].path)
435 goto out_free_all;
436 }
437 /* migrated */
438 err = get_int(mesg, &migrated);
439 if (err)
440 goto out_free_all;
441 err = -EINVAL;
442 if (migrated < 0 || migrated > 1)
443 goto out_free_all;
444 fsloc->migrated = migrated;
445 return 0;
446 out_free_all:
447 nfsd4_fslocs_free(fsloc);
448 return err;
449 }
450
451 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
452 {
453 int listsize, err;
454 struct exp_flavor_info *f;
455
456 err = get_int(mesg, &listsize);
457 if (err)
458 return err;
459 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
460 return -EINVAL;
461
462 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
463 err = get_int(mesg, &f->pseudoflavor);
464 if (err)
465 return err;
466 /*
467 * XXX: It would be nice to also check whether this
468 * pseudoflavor is supported, so we can discover the
469 * problem at export time instead of when a client fails
470 * to authenticate.
471 */
472 err = get_int(mesg, &f->flags);
473 if (err)
474 return err;
475 /* Only some flags are allowed to differ between flavors: */
476 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
477 return -EINVAL;
478 }
479 exp->ex_nflavors = listsize;
480 return 0;
481 }
482
483 #else /* CONFIG_NFSD_V4 */
484 static inline int
485 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
486 static inline int
487 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
488 #endif
489
490 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
491 {
492 /* client path expiry [flags anonuid anongid fsid] */
493 char *buf;
494 int len;
495 int err;
496 struct auth_domain *dom = NULL;
497 struct svc_export exp = {}, *expp;
498 int an_int;
499
500 if (mesg[mlen-1] != '\n')
501 return -EINVAL;
502 mesg[mlen-1] = 0;
503
504 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
505 if (!buf)
506 return -ENOMEM;
507
508 /* client */
509 err = -EINVAL;
510 len = qword_get(&mesg, buf, PAGE_SIZE);
511 if (len <= 0)
512 goto out;
513
514 err = -ENOENT;
515 dom = auth_domain_find(buf);
516 if (!dom)
517 goto out;
518
519 /* path */
520 err = -EINVAL;
521 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
522 goto out1;
523
524 err = kern_path(buf, 0, &exp.ex_path);
525 if (err)
526 goto out1;
527
528 exp.ex_client = dom;
529
530 err = -ENOMEM;
531 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
532 if (!exp.ex_pathname)
533 goto out2;
534
535 /* expiry */
536 err = -EINVAL;
537 exp.h.expiry_time = get_expiry(&mesg);
538 if (exp.h.expiry_time == 0)
539 goto out3;
540
541 /* flags */
542 err = get_int(&mesg, &an_int);
543 if (err == -ENOENT) {
544 err = 0;
545 set_bit(CACHE_NEGATIVE, &exp.h.flags);
546 } else {
547 if (err || an_int < 0)
548 goto out3;
549 exp.ex_flags= an_int;
550
551 /* anon uid */
552 err = get_int(&mesg, &an_int);
553 if (err)
554 goto out3;
555 exp.ex_anon_uid= an_int;
556
557 /* anon gid */
558 err = get_int(&mesg, &an_int);
559 if (err)
560 goto out3;
561 exp.ex_anon_gid= an_int;
562
563 /* fsid */
564 err = get_int(&mesg, &an_int);
565 if (err)
566 goto out3;
567 exp.ex_fsid = an_int;
568
569 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
570 if (strcmp(buf, "fsloc") == 0)
571 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
572 else if (strcmp(buf, "uuid") == 0) {
573 /* expect a 16 byte uuid encoded as \xXXXX... */
574 len = qword_get(&mesg, buf, PAGE_SIZE);
575 if (len != 16)
576 err = -EINVAL;
577 else {
578 exp.ex_uuid =
579 kmemdup(buf, 16, GFP_KERNEL);
580 if (exp.ex_uuid == NULL)
581 err = -ENOMEM;
582 }
583 } else if (strcmp(buf, "secinfo") == 0)
584 err = secinfo_parse(&mesg, buf, &exp);
585 else
586 /* quietly ignore unknown words and anything
587 * following. Newer user-space can try to set
588 * new values, then see what the result was.
589 */
590 break;
591 if (err)
592 goto out4;
593 }
594
595 err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
596 exp.ex_uuid);
597 if (err)
598 goto out4;
599 }
600
601 expp = svc_export_lookup(&exp);
602 if (expp)
603 expp = svc_export_update(&exp, expp);
604 else
605 err = -ENOMEM;
606 cache_flush();
607 if (expp == NULL)
608 err = -ENOMEM;
609 else
610 exp_put(expp);
611 out4:
612 nfsd4_fslocs_free(&exp.ex_fslocs);
613 kfree(exp.ex_uuid);
614 out3:
615 kfree(exp.ex_pathname);
616 out2:
617 path_put(&exp.ex_path);
618 out1:
619 auth_domain_put(dom);
620 out:
621 kfree(buf);
622 return err;
623 }
624
625 static void exp_flags(struct seq_file *m, int flag, int fsid,
626 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
627 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
628
629 static int svc_export_show(struct seq_file *m,
630 struct cache_detail *cd,
631 struct cache_head *h)
632 {
633 struct svc_export *exp ;
634
635 if (h ==NULL) {
636 seq_puts(m, "#path domain(flags)\n");
637 return 0;
638 }
639 exp = container_of(h, struct svc_export, h);
640 seq_path(m, &exp->ex_path, " \t\n\\");
641 seq_putc(m, '\t');
642 seq_escape(m, exp->ex_client->name, " \t\n\\");
643 seq_putc(m, '(');
644 if (test_bit(CACHE_VALID, &h->flags) &&
645 !test_bit(CACHE_NEGATIVE, &h->flags)) {
646 exp_flags(m, exp->ex_flags, exp->ex_fsid,
647 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
648 if (exp->ex_uuid) {
649 int i;
650 seq_puts(m, ",uuid=");
651 for (i=0; i<16; i++) {
652 if ((i&3) == 0 && i)
653 seq_putc(m, ':');
654 seq_printf(m, "%02x", exp->ex_uuid[i]);
655 }
656 }
657 show_secinfo(m, exp);
658 }
659 seq_puts(m, ")\n");
660 return 0;
661 }
662 static int svc_export_match(struct cache_head *a, struct cache_head *b)
663 {
664 struct svc_export *orig = container_of(a, struct svc_export, h);
665 struct svc_export *new = container_of(b, struct svc_export, h);
666 return orig->ex_client == new->ex_client &&
667 orig->ex_path.dentry == new->ex_path.dentry &&
668 orig->ex_path.mnt == new->ex_path.mnt;
669 }
670
671 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
672 {
673 struct svc_export *new = container_of(cnew, struct svc_export, h);
674 struct svc_export *item = container_of(citem, struct svc_export, h);
675
676 kref_get(&item->ex_client->ref);
677 new->ex_client = item->ex_client;
678 new->ex_path.dentry = dget(item->ex_path.dentry);
679 new->ex_path.mnt = mntget(item->ex_path.mnt);
680 new->ex_pathname = NULL;
681 new->ex_fslocs.locations = NULL;
682 new->ex_fslocs.locations_count = 0;
683 new->ex_fslocs.migrated = 0;
684 }
685
686 static void export_update(struct cache_head *cnew, struct cache_head *citem)
687 {
688 struct svc_export *new = container_of(cnew, struct svc_export, h);
689 struct svc_export *item = container_of(citem, struct svc_export, h);
690 int i;
691
692 new->ex_flags = item->ex_flags;
693 new->ex_anon_uid = item->ex_anon_uid;
694 new->ex_anon_gid = item->ex_anon_gid;
695 new->ex_fsid = item->ex_fsid;
696 new->ex_uuid = item->ex_uuid;
697 item->ex_uuid = NULL;
698 new->ex_pathname = item->ex_pathname;
699 item->ex_pathname = NULL;
700 new->ex_fslocs.locations = item->ex_fslocs.locations;
701 item->ex_fslocs.locations = NULL;
702 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
703 item->ex_fslocs.locations_count = 0;
704 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
705 item->ex_fslocs.migrated = 0;
706 new->ex_nflavors = item->ex_nflavors;
707 for (i = 0; i < MAX_SECINFO_LIST; i++) {
708 new->ex_flavors[i] = item->ex_flavors[i];
709 }
710 }
711
712 static struct cache_head *svc_export_alloc(void)
713 {
714 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
715 if (i)
716 return &i->h;
717 else
718 return NULL;
719 }
720
721 struct cache_detail svc_export_cache = {
722 .owner = THIS_MODULE,
723 .hash_size = EXPORT_HASHMAX,
724 .hash_table = export_table,
725 .name = "nfsd.export",
726 .cache_put = svc_export_put,
727 .cache_request = svc_export_request,
728 .cache_parse = svc_export_parse,
729 .cache_show = svc_export_show,
730 .match = svc_export_match,
731 .init = svc_export_init,
732 .update = export_update,
733 .alloc = svc_export_alloc,
734 };
735
736 static struct svc_export *
737 svc_export_lookup(struct svc_export *exp)
738 {
739 struct cache_head *ch;
740 int hash;
741 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
742 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
743 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
744
745 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
746 hash);
747 if (ch)
748 return container_of(ch, struct svc_export, h);
749 else
750 return NULL;
751 }
752
753 static struct svc_export *
754 svc_export_update(struct svc_export *new, struct svc_export *old)
755 {
756 struct cache_head *ch;
757 int hash;
758 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
759 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
760 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
761
762 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
763 &old->h,
764 hash);
765 if (ch)
766 return container_of(ch, struct svc_export, h);
767 else
768 return NULL;
769 }
770
771
772 static struct svc_expkey *
773 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
774 {
775 struct svc_expkey key, *ek;
776 int err;
777
778 if (!clp)
779 return ERR_PTR(-ENOENT);
780
781 key.ek_client = clp;
782 key.ek_fsidtype = fsid_type;
783 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
784
785 ek = svc_expkey_lookup(&key);
786 if (ek == NULL)
787 return ERR_PTR(-ENOMEM);
788 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
789 if (err)
790 return ERR_PTR(err);
791 return ek;
792 }
793
794 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
795 struct svc_export *exp)
796 {
797 struct svc_expkey key, *ek;
798
799 key.ek_client = clp;
800 key.ek_fsidtype = fsid_type;
801 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
802 key.ek_path = exp->ex_path;
803 key.h.expiry_time = NEVER;
804 key.h.flags = 0;
805
806 ek = svc_expkey_lookup(&key);
807 if (ek)
808 ek = svc_expkey_update(&key,ek);
809 if (ek) {
810 cache_put(&ek->h, &svc_expkey_cache);
811 return 0;
812 }
813 return -ENOMEM;
814 }
815
816 /*
817 * Find the client's export entry matching xdev/xino.
818 */
819 static inline struct svc_expkey *
820 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
821 {
822 u32 fsidv[3];
823
824 if (old_valid_dev(dev)) {
825 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
826 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
827 }
828 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
829 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
830 }
831
832 /*
833 * Find the client's export entry matching fsid
834 */
835 static inline struct svc_expkey *
836 exp_get_fsid_key(svc_client *clp, int fsid)
837 {
838 u32 fsidv[2];
839
840 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
841
842 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
843 }
844
845 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
846 struct cache_req *reqp)
847 {
848 struct svc_export *exp, key;
849 int err;
850
851 if (!clp)
852 return ERR_PTR(-ENOENT);
853
854 key.ex_client = clp;
855 key.ex_path = *path;
856
857 exp = svc_export_lookup(&key);
858 if (exp == NULL)
859 return ERR_PTR(-ENOMEM);
860 err = cache_check(&svc_export_cache, &exp->h, reqp);
861 if (err)
862 return ERR_PTR(err);
863 return exp;
864 }
865
866 /*
867 * Find the export entry for a given dentry.
868 */
869 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
870 {
871 struct dentry *saved = dget(path->dentry);
872 svc_export *exp = exp_get_by_name(clp, path, NULL);
873
874 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
875 struct dentry *parent = dget_parent(path->dentry);
876 dput(path->dentry);
877 path->dentry = parent;
878 exp = exp_get_by_name(clp, path, NULL);
879 }
880 dput(path->dentry);
881 path->dentry = saved;
882 return exp;
883 }
884
885 /*
886 * Hashtable locking. Write locks are placed only by user processes
887 * wanting to modify export information.
888 * Write locking only done in this file. Read locking
889 * needed externally.
890 */
891
892 static DECLARE_RWSEM(hash_sem);
893
894 void
895 exp_readlock(void)
896 {
897 down_read(&hash_sem);
898 }
899
900 static inline void
901 exp_writelock(void)
902 {
903 down_write(&hash_sem);
904 }
905
906 void
907 exp_readunlock(void)
908 {
909 up_read(&hash_sem);
910 }
911
912 static inline void
913 exp_writeunlock(void)
914 {
915 up_write(&hash_sem);
916 }
917
918 static void exp_fsid_unhash(struct svc_export *exp)
919 {
920 struct svc_expkey *ek;
921
922 if ((exp->ex_flags & NFSEXP_FSID) == 0)
923 return;
924
925 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
926 if (!IS_ERR(ek)) {
927 ek->h.expiry_time = get_seconds()-1;
928 cache_put(&ek->h, &svc_expkey_cache);
929 }
930 svc_expkey_cache.nextcheck = get_seconds();
931 }
932
933 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
934 {
935 u32 fsid[2];
936
937 if ((exp->ex_flags & NFSEXP_FSID) == 0)
938 return 0;
939
940 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
941 return exp_set_key(clp, FSID_NUM, fsid, exp);
942 }
943
944 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
945 {
946 u32 fsid[2];
947 struct inode *inode = exp->ex_path.dentry->d_inode;
948 dev_t dev = inode->i_sb->s_dev;
949
950 if (old_valid_dev(dev)) {
951 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
952 return exp_set_key(clp, FSID_DEV, fsid, exp);
953 }
954 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
955 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
956 }
957
958 static void exp_unhash(struct svc_export *exp)
959 {
960 struct svc_expkey *ek;
961 struct inode *inode = exp->ex_path.dentry->d_inode;
962
963 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
964 if (!IS_ERR(ek)) {
965 ek->h.expiry_time = get_seconds()-1;
966 cache_put(&ek->h, &svc_expkey_cache);
967 }
968 svc_expkey_cache.nextcheck = get_seconds();
969 }
970
971 /*
972 * Export a file system.
973 */
974 int
975 exp_export(struct nfsctl_export *nxp)
976 {
977 svc_client *clp;
978 struct svc_export *exp = NULL;
979 struct svc_export new;
980 struct svc_expkey *fsid_key = NULL;
981 struct path path;
982 int err;
983
984 /* Consistency check */
985 err = -EINVAL;
986 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
987 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
988 goto out;
989
990 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
991 nxp->ex_client, nxp->ex_path,
992 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
993 nxp->ex_flags);
994
995 /* Try to lock the export table for update */
996 exp_writelock();
997
998 /* Look up client info */
999 if (!(clp = auth_domain_find(nxp->ex_client)))
1000 goto out_unlock;
1001
1002
1003 /* Look up the dentry */
1004 err = kern_path(nxp->ex_path, 0, &path);
1005 if (err)
1006 goto out_put_clp;
1007 err = -EINVAL;
1008
1009 exp = exp_get_by_name(clp, &path, NULL);
1010
1011 memset(&new, 0, sizeof(new));
1012
1013 /* must make sure there won't be an ex_fsid clash */
1014 if ((nxp->ex_flags & NFSEXP_FSID) &&
1015 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1016 fsid_key->ek_path.mnt &&
1017 (fsid_key->ek_path.mnt != path.mnt ||
1018 fsid_key->ek_path.dentry != path.dentry))
1019 goto finish;
1020
1021 if (!IS_ERR(exp)) {
1022 /* just a flags/id/fsid update */
1023
1024 exp_fsid_unhash(exp);
1025 exp->ex_flags = nxp->ex_flags;
1026 exp->ex_anon_uid = nxp->ex_anon_uid;
1027 exp->ex_anon_gid = nxp->ex_anon_gid;
1028 exp->ex_fsid = nxp->ex_dev;
1029
1030 err = exp_fsid_hash(clp, exp);
1031 goto finish;
1032 }
1033
1034 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1035 if (err) goto finish;
1036
1037 err = -ENOMEM;
1038
1039 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1040
1041 new.h.expiry_time = NEVER;
1042 new.h.flags = 0;
1043 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1044 if (!new.ex_pathname)
1045 goto finish;
1046 new.ex_client = clp;
1047 new.ex_path = path;
1048 new.ex_flags = nxp->ex_flags;
1049 new.ex_anon_uid = nxp->ex_anon_uid;
1050 new.ex_anon_gid = nxp->ex_anon_gid;
1051 new.ex_fsid = nxp->ex_dev;
1052
1053 exp = svc_export_lookup(&new);
1054 if (exp)
1055 exp = svc_export_update(&new, exp);
1056
1057 if (!exp)
1058 goto finish;
1059
1060 if (exp_hash(clp, exp) ||
1061 exp_fsid_hash(clp, exp)) {
1062 /* failed to create at least one index */
1063 exp_do_unexport(exp);
1064 cache_flush();
1065 } else
1066 err = 0;
1067 finish:
1068 kfree(new.ex_pathname);
1069 if (exp)
1070 exp_put(exp);
1071 if (fsid_key && !IS_ERR(fsid_key))
1072 cache_put(&fsid_key->h, &svc_expkey_cache);
1073 path_put(&path);
1074 out_put_clp:
1075 auth_domain_put(clp);
1076 out_unlock:
1077 exp_writeunlock();
1078 out:
1079 return err;
1080 }
1081
1082 /*
1083 * Unexport a file system. The export entry has already
1084 * been removed from the client's list of exported fs's.
1085 */
1086 static void
1087 exp_do_unexport(svc_export *unexp)
1088 {
1089 unexp->h.expiry_time = get_seconds()-1;
1090 svc_export_cache.nextcheck = get_seconds();
1091 exp_unhash(unexp);
1092 exp_fsid_unhash(unexp);
1093 }
1094
1095
1096 /*
1097 * unexport syscall.
1098 */
1099 int
1100 exp_unexport(struct nfsctl_export *nxp)
1101 {
1102 struct auth_domain *dom;
1103 svc_export *exp;
1104 struct path path;
1105 int err;
1106
1107 /* Consistency check */
1108 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1109 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1110 return -EINVAL;
1111
1112 exp_writelock();
1113
1114 err = -EINVAL;
1115 dom = auth_domain_find(nxp->ex_client);
1116 if (!dom) {
1117 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1118 goto out_unlock;
1119 }
1120
1121 err = kern_path(nxp->ex_path, 0, &path);
1122 if (err)
1123 goto out_domain;
1124
1125 err = -EINVAL;
1126 exp = exp_get_by_name(dom, &path, NULL);
1127 path_put(&path);
1128 if (IS_ERR(exp))
1129 goto out_domain;
1130
1131 exp_do_unexport(exp);
1132 exp_put(exp);
1133 err = 0;
1134
1135 out_domain:
1136 auth_domain_put(dom);
1137 cache_flush();
1138 out_unlock:
1139 exp_writeunlock();
1140 return err;
1141 }
1142
1143 /*
1144 * Obtain the root fh on behalf of a client.
1145 * This could be done in user space, but I feel that it adds some safety
1146 * since its harder to fool a kernel module than a user space program.
1147 */
1148 int
1149 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1150 {
1151 struct svc_export *exp;
1152 struct path path;
1153 struct inode *inode;
1154 struct svc_fh fh;
1155 int err;
1156
1157 err = -EPERM;
1158 /* NB: we probably ought to check that it's NUL-terminated */
1159 if (kern_path(name, 0, &path)) {
1160 printk("nfsd: exp_rootfh path not found %s", name);
1161 return err;
1162 }
1163 inode = path.dentry->d_inode;
1164
1165 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1166 name, path.dentry, clp->name,
1167 inode->i_sb->s_id, inode->i_ino);
1168 exp = exp_parent(clp, &path);
1169 if (IS_ERR(exp)) {
1170 err = PTR_ERR(exp);
1171 goto out;
1172 }
1173
1174 /*
1175 * fh must be initialized before calling fh_compose
1176 */
1177 fh_init(&fh, maxsize);
1178 if (fh_compose(&fh, exp, path.dentry, NULL))
1179 err = -EINVAL;
1180 else
1181 err = 0;
1182 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1183 fh_put(&fh);
1184 exp_put(exp);
1185 out:
1186 path_put(&path);
1187 return err;
1188 }
1189
1190 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1191 u32 *fsidv, struct cache_req *reqp)
1192 {
1193 struct svc_export *exp;
1194 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1195 if (IS_ERR(ek))
1196 return ERR_CAST(ek);
1197
1198 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1199 cache_put(&ek->h, &svc_expkey_cache);
1200
1201 if (IS_ERR(exp))
1202 return ERR_CAST(exp);
1203 return exp;
1204 }
1205
1206 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1207 {
1208 struct exp_flavor_info *f;
1209 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1210
1211 /* legacy gss-only clients are always OK: */
1212 if (exp->ex_client == rqstp->rq_gssclient)
1213 return 0;
1214 /* ip-address based client; check sec= export option: */
1215 for (f = exp->ex_flavors; f < end; f++) {
1216 if (f->pseudoflavor == rqstp->rq_flavor)
1217 return 0;
1218 }
1219 /* defaults in absence of sec= options: */
1220 if (exp->ex_nflavors == 0) {
1221 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1222 rqstp->rq_flavor == RPC_AUTH_UNIX)
1223 return 0;
1224 }
1225 return nfserr_wrongsec;
1226 }
1227
1228 /*
1229 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1230 * auth_unix client) if it's available and has secinfo information;
1231 * otherwise, will try to use rq_gssclient.
1232 *
1233 * Called from functions that handle requests; functions that do work on
1234 * behalf of mountd are passed a single client name to use, and should
1235 * use exp_get_by_name() or exp_find().
1236 */
1237 struct svc_export *
1238 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1239 {
1240 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1241
1242 if (rqstp->rq_client == NULL)
1243 goto gss;
1244
1245 /* First try the auth_unix client: */
1246 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1247 if (PTR_ERR(exp) == -ENOENT)
1248 goto gss;
1249 if (IS_ERR(exp))
1250 return exp;
1251 /* If it has secinfo, assume there are no gss/... clients */
1252 if (exp->ex_nflavors > 0)
1253 return exp;
1254 gss:
1255 /* Otherwise, try falling back on gss client */
1256 if (rqstp->rq_gssclient == NULL)
1257 return exp;
1258 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1259 if (PTR_ERR(gssexp) == -ENOENT)
1260 return exp;
1261 if (!IS_ERR(exp))
1262 exp_put(exp);
1263 return gssexp;
1264 }
1265
1266 struct svc_export *
1267 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1268 {
1269 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1270
1271 if (rqstp->rq_client == NULL)
1272 goto gss;
1273
1274 /* First try the auth_unix client: */
1275 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1276 if (PTR_ERR(exp) == -ENOENT)
1277 goto gss;
1278 if (IS_ERR(exp))
1279 return exp;
1280 /* If it has secinfo, assume there are no gss/... clients */
1281 if (exp->ex_nflavors > 0)
1282 return exp;
1283 gss:
1284 /* Otherwise, try falling back on gss client */
1285 if (rqstp->rq_gssclient == NULL)
1286 return exp;
1287 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1288 &rqstp->rq_chandle);
1289 if (PTR_ERR(gssexp) == -ENOENT)
1290 return exp;
1291 if (!IS_ERR(exp))
1292 exp_put(exp);
1293 return gssexp;
1294 }
1295
1296 struct svc_export *
1297 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1298 {
1299 struct dentry *saved = dget(path->dentry);
1300 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1301
1302 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1303 struct dentry *parent = dget_parent(path->dentry);
1304 dput(path->dentry);
1305 path->dentry = parent;
1306 exp = rqst_exp_get_by_name(rqstp, path);
1307 }
1308 dput(path->dentry);
1309 path->dentry = saved;
1310 return exp;
1311 }
1312
1313 /*
1314 * Called when we need the filehandle for the root of the pseudofs,
1315 * for a given NFSv4 client. The root is defined to be the
1316 * export point with fsid==0
1317 */
1318 __be32
1319 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1320 {
1321 struct svc_export *exp;
1322 __be32 rv;
1323 u32 fsidv[2];
1324
1325 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1326
1327 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1328 if (IS_ERR(exp))
1329 return nfserrno(PTR_ERR(exp));
1330 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1331 if (rv)
1332 goto out;
1333 rv = check_nfsd_access(exp, rqstp);
1334 out:
1335 exp_put(exp);
1336 return rv;
1337 }
1338
1339 /* Iterator */
1340
1341 static void *e_start(struct seq_file *m, loff_t *pos)
1342 __acquires(svc_export_cache.hash_lock)
1343 {
1344 loff_t n = *pos;
1345 unsigned hash, export;
1346 struct cache_head *ch;
1347
1348 exp_readlock();
1349 read_lock(&svc_export_cache.hash_lock);
1350 if (!n--)
1351 return SEQ_START_TOKEN;
1352 hash = n >> 32;
1353 export = n & ((1LL<<32) - 1);
1354
1355
1356 for (ch=export_table[hash]; ch; ch=ch->next)
1357 if (!export--)
1358 return ch;
1359 n &= ~((1LL<<32) - 1);
1360 do {
1361 hash++;
1362 n += 1LL<<32;
1363 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1364 if (hash >= EXPORT_HASHMAX)
1365 return NULL;
1366 *pos = n+1;
1367 return export_table[hash];
1368 }
1369
1370 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1371 {
1372 struct cache_head *ch = p;
1373 int hash = (*pos >> 32);
1374
1375 if (p == SEQ_START_TOKEN)
1376 hash = 0;
1377 else if (ch->next == NULL) {
1378 hash++;
1379 *pos += 1LL<<32;
1380 } else {
1381 ++*pos;
1382 return ch->next;
1383 }
1384 *pos &= ~((1LL<<32) - 1);
1385 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1386 hash++;
1387 *pos += 1LL<<32;
1388 }
1389 if (hash >= EXPORT_HASHMAX)
1390 return NULL;
1391 ++*pos;
1392 return export_table[hash];
1393 }
1394
1395 static void e_stop(struct seq_file *m, void *p)
1396 __releases(svc_export_cache.hash_lock)
1397 {
1398 read_unlock(&svc_export_cache.hash_lock);
1399 exp_readunlock();
1400 }
1401
1402 static struct flags {
1403 int flag;
1404 char *name[2];
1405 } expflags[] = {
1406 { NFSEXP_READONLY, {"ro", "rw"}},
1407 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1408 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1409 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1410 { NFSEXP_ASYNC, {"async", "sync"}},
1411 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1412 { NFSEXP_NOHIDE, {"nohide", ""}},
1413 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1414 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1415 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1416 #ifdef MSNFS
1417 { NFSEXP_MSNFS, {"msnfs", ""}},
1418 #endif
1419 { 0, {"", ""}}
1420 };
1421
1422 static void show_expflags(struct seq_file *m, int flags, int mask)
1423 {
1424 struct flags *flg;
1425 int state, first = 0;
1426
1427 for (flg = expflags; flg->flag; flg++) {
1428 if (flg->flag & ~mask)
1429 continue;
1430 state = (flg->flag & flags) ? 0 : 1;
1431 if (*flg->name[state])
1432 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1433 }
1434 }
1435
1436 static void show_secinfo_flags(struct seq_file *m, int flags)
1437 {
1438 seq_printf(m, ",");
1439 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1440 }
1441
1442 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1443 {
1444 struct exp_flavor_info *f;
1445 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1446 int lastflags = 0, first = 0;
1447
1448 if (exp->ex_nflavors == 0)
1449 return;
1450 for (f = exp->ex_flavors; f < end; f++) {
1451 if (first || f->flags != lastflags) {
1452 if (!first)
1453 show_secinfo_flags(m, lastflags);
1454 seq_printf(m, ",sec=%d", f->pseudoflavor);
1455 lastflags = f->flags;
1456 } else {
1457 seq_printf(m, ":%d", f->pseudoflavor);
1458 }
1459 }
1460 show_secinfo_flags(m, lastflags);
1461 }
1462
1463 static void exp_flags(struct seq_file *m, int flag, int fsid,
1464 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1465 {
1466 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1467 if (flag & NFSEXP_FSID)
1468 seq_printf(m, ",fsid=%d", fsid);
1469 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1470 seq_printf(m, ",anonuid=%u", anonu);
1471 if (anong != (gid_t)-2 && anong != (0x10000-2))
1472 seq_printf(m, ",anongid=%u", anong);
1473 if (fsloc && fsloc->locations_count > 0) {
1474 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1475 int i;
1476
1477 seq_printf(m, ",%s=", loctype);
1478 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1479 seq_putc(m, '@');
1480 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1481 for (i = 1; i < fsloc->locations_count; i++) {
1482 seq_putc(m, ';');
1483 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1484 seq_putc(m, '@');
1485 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1486 }
1487 }
1488 }
1489
1490 static int e_show(struct seq_file *m, void *p)
1491 {
1492 struct cache_head *cp = p;
1493 struct svc_export *exp = container_of(cp, struct svc_export, h);
1494
1495 if (p == SEQ_START_TOKEN) {
1496 seq_puts(m, "# Version 1.1\n");
1497 seq_puts(m, "# Path Client(Flags) # IPs\n");
1498 return 0;
1499 }
1500
1501 cache_get(&exp->h);
1502 if (cache_check(&svc_export_cache, &exp->h, NULL))
1503 return 0;
1504 cache_put(&exp->h, &svc_export_cache);
1505 return svc_export_show(m, &svc_export_cache, cp);
1506 }
1507
1508 struct seq_operations nfs_exports_op = {
1509 .start = e_start,
1510 .next = e_next,
1511 .stop = e_stop,
1512 .show = e_show,
1513 };
1514
1515 /*
1516 * Add or modify a client.
1517 * Change requests may involve the list of host addresses. The list of
1518 * exports and possibly existing uid maps are left untouched.
1519 */
1520 int
1521 exp_addclient(struct nfsctl_client *ncp)
1522 {
1523 struct auth_domain *dom;
1524 int i, err;
1525 struct in6_addr addr6;
1526
1527 /* First, consistency check. */
1528 err = -EINVAL;
1529 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1530 goto out;
1531 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1532 goto out;
1533
1534 /* Lock the hashtable */
1535 exp_writelock();
1536
1537 dom = unix_domain_find(ncp->cl_ident);
1538
1539 err = -ENOMEM;
1540 if (!dom)
1541 goto out_unlock;
1542
1543 /* Insert client into hashtable. */
1544 for (i = 0; i < ncp->cl_naddr; i++) {
1545 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1546 auth_unix_add_addr(&addr6, dom);
1547 }
1548 auth_unix_forget_old(dom);
1549 auth_domain_put(dom);
1550
1551 err = 0;
1552
1553 out_unlock:
1554 exp_writeunlock();
1555 out:
1556 return err;
1557 }
1558
1559 /*
1560 * Delete a client given an identifier.
1561 */
1562 int
1563 exp_delclient(struct nfsctl_client *ncp)
1564 {
1565 int err;
1566 struct auth_domain *dom;
1567
1568 err = -EINVAL;
1569 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1570 goto out;
1571
1572 /* Lock the hashtable */
1573 exp_writelock();
1574
1575 dom = auth_domain_find(ncp->cl_ident);
1576 /* just make sure that no addresses work
1577 * and that it will expire soon
1578 */
1579 if (dom) {
1580 err = auth_unix_forget_old(dom);
1581 auth_domain_put(dom);
1582 }
1583
1584 exp_writeunlock();
1585 out:
1586 return err;
1587 }
1588
1589 /*
1590 * Verify that string is non-empty and does not exceed max length.
1591 */
1592 static int
1593 exp_verify_string(char *cp, int max)
1594 {
1595 int i;
1596
1597 for (i = 0; i < max; i++)
1598 if (!cp[i])
1599 return i;
1600 cp[i] = 0;
1601 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1602 return 0;
1603 }
1604
1605 /*
1606 * Initialize the exports module.
1607 */
1608 int
1609 nfsd_export_init(void)
1610 {
1611 int rv;
1612 dprintk("nfsd: initializing export module.\n");
1613
1614 rv = cache_register(&svc_export_cache);
1615 if (rv)
1616 return rv;
1617 rv = cache_register(&svc_expkey_cache);
1618 if (rv)
1619 cache_unregister(&svc_export_cache);
1620 return rv;
1621
1622 }
1623
1624 /*
1625 * Flush exports table - called when last nfsd thread is killed
1626 */
1627 void
1628 nfsd_export_flush(void)
1629 {
1630 exp_writelock();
1631 cache_purge(&svc_expkey_cache);
1632 cache_purge(&svc_export_cache);
1633 exp_writeunlock();
1634 }
1635
1636 /*
1637 * Shutdown the exports module.
1638 */
1639 void
1640 nfsd_export_shutdown(void)
1641 {
1642
1643 dprintk("nfsd: shutting down export module.\n");
1644
1645 exp_writelock();
1646
1647 cache_unregister(&svc_expkey_cache);
1648 cache_unregister(&svc_export_cache);
1649 svcauth_unix_purge();
1650
1651 exp_writeunlock();
1652 dprintk("nfsd: export shutdown complete.\n");
1653 }
Linux kernel - Deliverables
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