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Merge branch 'for-2.6.28' of git://linux-nfs.org/~bfields/linux
[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 nameidata nd;
504 struct svc_export exp, *expp;
505 int an_int;
506
507 nd.path.dentry = NULL;
508 exp.ex_pathname = NULL;
509
510 /* fs locations */
511 exp.ex_fslocs.locations = NULL;
512 exp.ex_fslocs.locations_count = 0;
513 exp.ex_fslocs.migrated = 0;
514
515 exp.ex_uuid = NULL;
516
517 /* secinfo */
518 exp.ex_nflavors = 0;
519
520 if (mesg[mlen-1] != '\n')
521 return -EINVAL;
522 mesg[mlen-1] = 0;
523
524 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
525 err = -ENOMEM;
526 if (!buf) goto out;
527
528 /* client */
529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 err = -EINVAL;
531 if (len <= 0) goto out;
532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
540 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out;
542 err = path_lookup(buf, 0, &nd);
543 if (err) goto out_no_path;
544
545 exp.h.flags = 0;
546 exp.ex_client = dom;
547 exp.ex_path.mnt = nd.path.mnt;
548 exp.ex_path.dentry = nd.path.dentry;
549 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
550 err = -ENOMEM;
551 if (!exp.ex_pathname)
552 goto out;
553
554 /* expiry */
555 err = -EINVAL;
556 exp.h.expiry_time = get_expiry(&mesg);
557 if (exp.h.expiry_time == 0)
558 goto out;
559
560 /* flags */
561 err = get_int(&mesg, &an_int);
562 if (err == -ENOENT) {
563 err = 0;
564 set_bit(CACHE_NEGATIVE, &exp.h.flags);
565 } else {
566 if (err || an_int < 0) goto out;
567 exp.ex_flags= an_int;
568
569 /* anon uid */
570 err = get_int(&mesg, &an_int);
571 if (err) goto out;
572 exp.ex_anon_uid= an_int;
573
574 /* anon gid */
575 err = get_int(&mesg, &an_int);
576 if (err) goto out;
577 exp.ex_anon_gid= an_int;
578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
581 if (err) goto out;
582 exp.ex_fsid = an_int;
583
584 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
585 if (strcmp(buf, "fsloc") == 0)
586 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
587 else if (strcmp(buf, "uuid") == 0) {
588 /* expect a 16 byte uuid encoded as \xXXXX... */
589 len = qword_get(&mesg, buf, PAGE_SIZE);
590 if (len != 16)
591 err = -EINVAL;
592 else {
593 exp.ex_uuid =
594 kmemdup(buf, 16, GFP_KERNEL);
595 if (exp.ex_uuid == NULL)
596 err = -ENOMEM;
597 }
598 } else if (strcmp(buf, "secinfo") == 0)
599 err = secinfo_parse(&mesg, buf, &exp);
600 else
601 /* quietly ignore unknown words and anything
602 * following. Newer user-space can try to set
603 * new values, then see what the result was.
604 */
605 break;
606 if (err)
607 goto out;
608 }
609
610 err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
611 exp.ex_uuid);
612 if (err) goto out;
613 }
614
615 expp = svc_export_lookup(&exp);
616 if (expp)
617 expp = svc_export_update(&exp, expp);
618 else
619 err = -ENOMEM;
620 cache_flush();
621 if (expp == NULL)
622 err = -ENOMEM;
623 else
624 exp_put(expp);
625 out:
626 nfsd4_fslocs_free(&exp.ex_fslocs);
627 kfree(exp.ex_uuid);
628 kfree(exp.ex_pathname);
629 if (nd.path.dentry)
630 path_put(&nd.path);
631 out_no_path:
632 if (dom)
633 auth_domain_put(dom);
634 kfree(buf);
635 return err;
636 }
637
638 static void exp_flags(struct seq_file *m, int flag, int fsid,
639 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
640 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
641
642 static int svc_export_show(struct seq_file *m,
643 struct cache_detail *cd,
644 struct cache_head *h)
645 {
646 struct svc_export *exp ;
647
648 if (h ==NULL) {
649 seq_puts(m, "#path domain(flags)\n");
650 return 0;
651 }
652 exp = container_of(h, struct svc_export, h);
653 seq_path(m, &exp->ex_path, " \t\n\\");
654 seq_putc(m, '\t');
655 seq_escape(m, exp->ex_client->name, " \t\n\\");
656 seq_putc(m, '(');
657 if (test_bit(CACHE_VALID, &h->flags) &&
658 !test_bit(CACHE_NEGATIVE, &h->flags)) {
659 exp_flags(m, exp->ex_flags, exp->ex_fsid,
660 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
661 if (exp->ex_uuid) {
662 int i;
663 seq_puts(m, ",uuid=");
664 for (i=0; i<16; i++) {
665 if ((i&3) == 0 && i)
666 seq_putc(m, ':');
667 seq_printf(m, "%02x", exp->ex_uuid[i]);
668 }
669 }
670 show_secinfo(m, exp);
671 }
672 seq_puts(m, ")\n");
673 return 0;
674 }
675 static int svc_export_match(struct cache_head *a, struct cache_head *b)
676 {
677 struct svc_export *orig = container_of(a, struct svc_export, h);
678 struct svc_export *new = container_of(b, struct svc_export, h);
679 return orig->ex_client == new->ex_client &&
680 orig->ex_path.dentry == new->ex_path.dentry &&
681 orig->ex_path.mnt == new->ex_path.mnt;
682 }
683
684 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
685 {
686 struct svc_export *new = container_of(cnew, struct svc_export, h);
687 struct svc_export *item = container_of(citem, struct svc_export, h);
688
689 kref_get(&item->ex_client->ref);
690 new->ex_client = item->ex_client;
691 new->ex_path.dentry = dget(item->ex_path.dentry);
692 new->ex_path.mnt = mntget(item->ex_path.mnt);
693 new->ex_pathname = NULL;
694 new->ex_fslocs.locations = NULL;
695 new->ex_fslocs.locations_count = 0;
696 new->ex_fslocs.migrated = 0;
697 }
698
699 static void export_update(struct cache_head *cnew, struct cache_head *citem)
700 {
701 struct svc_export *new = container_of(cnew, struct svc_export, h);
702 struct svc_export *item = container_of(citem, struct svc_export, h);
703 int i;
704
705 new->ex_flags = item->ex_flags;
706 new->ex_anon_uid = item->ex_anon_uid;
707 new->ex_anon_gid = item->ex_anon_gid;
708 new->ex_fsid = item->ex_fsid;
709 new->ex_uuid = item->ex_uuid;
710 item->ex_uuid = NULL;
711 new->ex_pathname = item->ex_pathname;
712 item->ex_pathname = NULL;
713 new->ex_fslocs.locations = item->ex_fslocs.locations;
714 item->ex_fslocs.locations = NULL;
715 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
716 item->ex_fslocs.locations_count = 0;
717 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
718 item->ex_fslocs.migrated = 0;
719 new->ex_nflavors = item->ex_nflavors;
720 for (i = 0; i < MAX_SECINFO_LIST; i++) {
721 new->ex_flavors[i] = item->ex_flavors[i];
722 }
723 }
724
725 static struct cache_head *svc_export_alloc(void)
726 {
727 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
728 if (i)
729 return &i->h;
730 else
731 return NULL;
732 }
733
734 struct cache_detail svc_export_cache = {
735 .owner = THIS_MODULE,
736 .hash_size = EXPORT_HASHMAX,
737 .hash_table = export_table,
738 .name = "nfsd.export",
739 .cache_put = svc_export_put,
740 .cache_request = svc_export_request,
741 .cache_parse = svc_export_parse,
742 .cache_show = svc_export_show,
743 .match = svc_export_match,
744 .init = svc_export_init,
745 .update = export_update,
746 .alloc = svc_export_alloc,
747 };
748
749 static struct svc_export *
750 svc_export_lookup(struct svc_export *exp)
751 {
752 struct cache_head *ch;
753 int hash;
754 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
755 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
756 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
757
758 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
759 hash);
760 if (ch)
761 return container_of(ch, struct svc_export, h);
762 else
763 return NULL;
764 }
765
766 static struct svc_export *
767 svc_export_update(struct svc_export *new, struct svc_export *old)
768 {
769 struct cache_head *ch;
770 int hash;
771 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
772 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
773 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
774
775 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
776 &old->h,
777 hash);
778 if (ch)
779 return container_of(ch, struct svc_export, h);
780 else
781 return NULL;
782 }
783
784
785 static struct svc_expkey *
786 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
787 {
788 struct svc_expkey key, *ek;
789 int err;
790
791 if (!clp)
792 return ERR_PTR(-ENOENT);
793
794 key.ek_client = clp;
795 key.ek_fsidtype = fsid_type;
796 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
797
798 ek = svc_expkey_lookup(&key);
799 if (ek == NULL)
800 return ERR_PTR(-ENOMEM);
801 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
802 if (err)
803 return ERR_PTR(err);
804 return ek;
805 }
806
807 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
808 struct svc_export *exp)
809 {
810 struct svc_expkey key, *ek;
811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
815 key.ek_path = exp->ex_path;
816 key.h.expiry_time = NEVER;
817 key.h.flags = 0;
818
819 ek = svc_expkey_lookup(&key);
820 if (ek)
821 ek = svc_expkey_update(&key,ek);
822 if (ek) {
823 cache_put(&ek->h, &svc_expkey_cache);
824 return 0;
825 }
826 return -ENOMEM;
827 }
828
829 /*
830 * Find the client's export entry matching xdev/xino.
831 */
832 static inline struct svc_expkey *
833 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
834 {
835 u32 fsidv[3];
836
837 if (old_valid_dev(dev)) {
838 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
839 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
840 }
841 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
842 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
843 }
844
845 /*
846 * Find the client's export entry matching fsid
847 */
848 static inline struct svc_expkey *
849 exp_get_fsid_key(svc_client *clp, int fsid)
850 {
851 u32 fsidv[2];
852
853 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
854
855 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
856 }
857
858 static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
859 struct dentry *dentry,
860 struct cache_req *reqp)
861 {
862 struct svc_export *exp, key;
863 int err;
864
865 if (!clp)
866 return ERR_PTR(-ENOENT);
867
868 key.ex_client = clp;
869 key.ex_path.mnt = mnt;
870 key.ex_path.dentry = dentry;
871
872 exp = svc_export_lookup(&key);
873 if (exp == NULL)
874 return ERR_PTR(-ENOMEM);
875 err = cache_check(&svc_export_cache, &exp->h, reqp);
876 if (err)
877 return ERR_PTR(err);
878 return exp;
879 }
880
881 /*
882 * Find the export entry for a given dentry.
883 */
884 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
885 struct dentry *dentry,
886 struct cache_req *reqp)
887 {
888 svc_export *exp;
889
890 dget(dentry);
891 exp = exp_get_by_name(clp, mnt, dentry, reqp);
892
893 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
894 struct dentry *parent;
895
896 parent = dget_parent(dentry);
897 dput(dentry);
898 dentry = parent;
899 exp = exp_get_by_name(clp, mnt, dentry, reqp);
900 }
901 dput(dentry);
902 return exp;
903 }
904
905 /*
906 * Hashtable locking. Write locks are placed only by user processes
907 * wanting to modify export information.
908 * Write locking only done in this file. Read locking
909 * needed externally.
910 */
911
912 static DECLARE_RWSEM(hash_sem);
913
914 void
915 exp_readlock(void)
916 {
917 down_read(&hash_sem);
918 }
919
920 static inline void
921 exp_writelock(void)
922 {
923 down_write(&hash_sem);
924 }
925
926 void
927 exp_readunlock(void)
928 {
929 up_read(&hash_sem);
930 }
931
932 static inline void
933 exp_writeunlock(void)
934 {
935 up_write(&hash_sem);
936 }
937
938 static void exp_fsid_unhash(struct svc_export *exp)
939 {
940 struct svc_expkey *ek;
941
942 if ((exp->ex_flags & NFSEXP_FSID) == 0)
943 return;
944
945 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
946 if (!IS_ERR(ek)) {
947 ek->h.expiry_time = get_seconds()-1;
948 cache_put(&ek->h, &svc_expkey_cache);
949 }
950 svc_expkey_cache.nextcheck = get_seconds();
951 }
952
953 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
954 {
955 u32 fsid[2];
956
957 if ((exp->ex_flags & NFSEXP_FSID) == 0)
958 return 0;
959
960 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
961 return exp_set_key(clp, FSID_NUM, fsid, exp);
962 }
963
964 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
965 {
966 u32 fsid[2];
967 struct inode *inode = exp->ex_path.dentry->d_inode;
968 dev_t dev = inode->i_sb->s_dev;
969
970 if (old_valid_dev(dev)) {
971 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
972 return exp_set_key(clp, FSID_DEV, fsid, exp);
973 }
974 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
975 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
976 }
977
978 static void exp_unhash(struct svc_export *exp)
979 {
980 struct svc_expkey *ek;
981 struct inode *inode = exp->ex_path.dentry->d_inode;
982
983 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
984 if (!IS_ERR(ek)) {
985 ek->h.expiry_time = get_seconds()-1;
986 cache_put(&ek->h, &svc_expkey_cache);
987 }
988 svc_expkey_cache.nextcheck = get_seconds();
989 }
990
991 /*
992 * Export a file system.
993 */
994 int
995 exp_export(struct nfsctl_export *nxp)
996 {
997 svc_client *clp;
998 struct svc_export *exp = NULL;
999 struct svc_export new;
1000 struct svc_expkey *fsid_key = NULL;
1001 struct nameidata nd;
1002 int err;
1003
1004 /* Consistency check */
1005 err = -EINVAL;
1006 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1007 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1008 goto out;
1009
1010 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1011 nxp->ex_client, nxp->ex_path,
1012 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1013 nxp->ex_flags);
1014
1015 /* Try to lock the export table for update */
1016 exp_writelock();
1017
1018 /* Look up client info */
1019 if (!(clp = auth_domain_find(nxp->ex_client)))
1020 goto out_unlock;
1021
1022
1023 /* Look up the dentry */
1024 err = path_lookup(nxp->ex_path, 0, &nd);
1025 if (err)
1026 goto out_put_clp;
1027 err = -EINVAL;
1028
1029 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
1030
1031 memset(&new, 0, sizeof(new));
1032
1033 /* must make sure there won't be an ex_fsid clash */
1034 if ((nxp->ex_flags & NFSEXP_FSID) &&
1035 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1036 fsid_key->ek_path.mnt &&
1037 (fsid_key->ek_path.mnt != nd.path.mnt ||
1038 fsid_key->ek_path.dentry != nd.path.dentry))
1039 goto finish;
1040
1041 if (!IS_ERR(exp)) {
1042 /* just a flags/id/fsid update */
1043
1044 exp_fsid_unhash(exp);
1045 exp->ex_flags = nxp->ex_flags;
1046 exp->ex_anon_uid = nxp->ex_anon_uid;
1047 exp->ex_anon_gid = nxp->ex_anon_gid;
1048 exp->ex_fsid = nxp->ex_dev;
1049
1050 err = exp_fsid_hash(clp, exp);
1051 goto finish;
1052 }
1053
1054 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
1055 if (err) goto finish;
1056
1057 err = -ENOMEM;
1058
1059 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1060
1061 new.h.expiry_time = NEVER;
1062 new.h.flags = 0;
1063 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1064 if (!new.ex_pathname)
1065 goto finish;
1066 new.ex_client = clp;
1067 new.ex_path = nd.path;
1068 new.ex_flags = nxp->ex_flags;
1069 new.ex_anon_uid = nxp->ex_anon_uid;
1070 new.ex_anon_gid = nxp->ex_anon_gid;
1071 new.ex_fsid = nxp->ex_dev;
1072
1073 exp = svc_export_lookup(&new);
1074 if (exp)
1075 exp = svc_export_update(&new, exp);
1076
1077 if (!exp)
1078 goto finish;
1079
1080 if (exp_hash(clp, exp) ||
1081 exp_fsid_hash(clp, exp)) {
1082 /* failed to create at least one index */
1083 exp_do_unexport(exp);
1084 cache_flush();
1085 } else
1086 err = 0;
1087 finish:
1088 kfree(new.ex_pathname);
1089 if (exp)
1090 exp_put(exp);
1091 if (fsid_key && !IS_ERR(fsid_key))
1092 cache_put(&fsid_key->h, &svc_expkey_cache);
1093 path_put(&nd.path);
1094 out_put_clp:
1095 auth_domain_put(clp);
1096 out_unlock:
1097 exp_writeunlock();
1098 out:
1099 return err;
1100 }
1101
1102 /*
1103 * Unexport a file system. The export entry has already
1104 * been removed from the client's list of exported fs's.
1105 */
1106 static void
1107 exp_do_unexport(svc_export *unexp)
1108 {
1109 unexp->h.expiry_time = get_seconds()-1;
1110 svc_export_cache.nextcheck = get_seconds();
1111 exp_unhash(unexp);
1112 exp_fsid_unhash(unexp);
1113 }
1114
1115
1116 /*
1117 * unexport syscall.
1118 */
1119 int
1120 exp_unexport(struct nfsctl_export *nxp)
1121 {
1122 struct auth_domain *dom;
1123 svc_export *exp;
1124 struct nameidata nd;
1125 int err;
1126
1127 /* Consistency check */
1128 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1129 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1130 return -EINVAL;
1131
1132 exp_writelock();
1133
1134 err = -EINVAL;
1135 dom = auth_domain_find(nxp->ex_client);
1136 if (!dom) {
1137 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1138 goto out_unlock;
1139 }
1140
1141 err = path_lookup(nxp->ex_path, 0, &nd);
1142 if (err)
1143 goto out_domain;
1144
1145 err = -EINVAL;
1146 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
1147 path_put(&nd.path);
1148 if (IS_ERR(exp))
1149 goto out_domain;
1150
1151 exp_do_unexport(exp);
1152 exp_put(exp);
1153 err = 0;
1154
1155 out_domain:
1156 auth_domain_put(dom);
1157 cache_flush();
1158 out_unlock:
1159 exp_writeunlock();
1160 return err;
1161 }
1162
1163 /*
1164 * Obtain the root fh on behalf of a client.
1165 * This could be done in user space, but I feel that it adds some safety
1166 * since its harder to fool a kernel module than a user space program.
1167 */
1168 int
1169 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1170 {
1171 struct svc_export *exp;
1172 struct nameidata nd;
1173 struct inode *inode;
1174 struct svc_fh fh;
1175 int err;
1176
1177 err = -EPERM;
1178 /* NB: we probably ought to check that it's NUL-terminated */
1179 if (path_lookup(path, 0, &nd)) {
1180 printk("nfsd: exp_rootfh path not found %s", path);
1181 return err;
1182 }
1183 inode = nd.path.dentry->d_inode;
1184
1185 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1186 path, nd.path.dentry, clp->name,
1187 inode->i_sb->s_id, inode->i_ino);
1188 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
1189 if (IS_ERR(exp)) {
1190 err = PTR_ERR(exp);
1191 goto out;
1192 }
1193
1194 /*
1195 * fh must be initialized before calling fh_compose
1196 */
1197 fh_init(&fh, maxsize);
1198 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
1199 err = -EINVAL;
1200 else
1201 err = 0;
1202 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1203 fh_put(&fh);
1204 exp_put(exp);
1205 out:
1206 path_put(&nd.path);
1207 return err;
1208 }
1209
1210 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1211 u32 *fsidv, struct cache_req *reqp)
1212 {
1213 struct svc_export *exp;
1214 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1215 if (IS_ERR(ek))
1216 return ERR_CAST(ek);
1217
1218 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
1219 cache_put(&ek->h, &svc_expkey_cache);
1220
1221 if (IS_ERR(exp))
1222 return ERR_CAST(exp);
1223 return exp;
1224 }
1225
1226 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1227 {
1228 struct exp_flavor_info *f;
1229 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1230
1231 /* legacy gss-only clients are always OK: */
1232 if (exp->ex_client == rqstp->rq_gssclient)
1233 return 0;
1234 /* ip-address based client; check sec= export option: */
1235 for (f = exp->ex_flavors; f < end; f++) {
1236 if (f->pseudoflavor == rqstp->rq_flavor)
1237 return 0;
1238 }
1239 /* defaults in absence of sec= options: */
1240 if (exp->ex_nflavors == 0) {
1241 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1242 rqstp->rq_flavor == RPC_AUTH_UNIX)
1243 return 0;
1244 }
1245 return nfserr_wrongsec;
1246 }
1247
1248 /*
1249 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1250 * auth_unix client) if it's available and has secinfo information;
1251 * otherwise, will try to use rq_gssclient.
1252 *
1253 * Called from functions that handle requests; functions that do work on
1254 * behalf of mountd are passed a single client name to use, and should
1255 * use exp_get_by_name() or exp_find().
1256 */
1257 struct svc_export *
1258 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1259 struct dentry *dentry)
1260 {
1261 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1262
1263 if (rqstp->rq_client == NULL)
1264 goto gss;
1265
1266 /* First try the auth_unix client: */
1267 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1268 &rqstp->rq_chandle);
1269 if (PTR_ERR(exp) == -ENOENT)
1270 goto gss;
1271 if (IS_ERR(exp))
1272 return exp;
1273 /* If it has secinfo, assume there are no gss/... clients */
1274 if (exp->ex_nflavors > 0)
1275 return exp;
1276 gss:
1277 /* Otherwise, try falling back on gss client */
1278 if (rqstp->rq_gssclient == NULL)
1279 return exp;
1280 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1281 &rqstp->rq_chandle);
1282 if (PTR_ERR(gssexp) == -ENOENT)
1283 return exp;
1284 if (!IS_ERR(exp))
1285 exp_put(exp);
1286 return gssexp;
1287 }
1288
1289 struct svc_export *
1290 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1291 {
1292 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1293
1294 if (rqstp->rq_client == NULL)
1295 goto gss;
1296
1297 /* First try the auth_unix client: */
1298 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1299 if (PTR_ERR(exp) == -ENOENT)
1300 goto gss;
1301 if (IS_ERR(exp))
1302 return exp;
1303 /* If it has secinfo, assume there are no gss/... clients */
1304 if (exp->ex_nflavors > 0)
1305 return exp;
1306 gss:
1307 /* Otherwise, try falling back on gss client */
1308 if (rqstp->rq_gssclient == NULL)
1309 return exp;
1310 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1311 &rqstp->rq_chandle);
1312 if (PTR_ERR(gssexp) == -ENOENT)
1313 return exp;
1314 if (!IS_ERR(exp))
1315 exp_put(exp);
1316 return gssexp;
1317 }
1318
1319 struct svc_export *
1320 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1321 struct dentry *dentry)
1322 {
1323 struct svc_export *exp;
1324
1325 dget(dentry);
1326 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1327
1328 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1329 struct dentry *parent;
1330
1331 parent = dget_parent(dentry);
1332 dput(dentry);
1333 dentry = parent;
1334 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1335 }
1336 dput(dentry);
1337 return exp;
1338 }
1339
1340 /*
1341 * Called when we need the filehandle for the root of the pseudofs,
1342 * for a given NFSv4 client. The root is defined to be the
1343 * export point with fsid==0
1344 */
1345 __be32
1346 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1347 {
1348 struct svc_export *exp;
1349 __be32 rv;
1350 u32 fsidv[2];
1351
1352 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1353
1354 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1355 if (IS_ERR(exp))
1356 return nfserrno(PTR_ERR(exp));
1357 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1358 if (rv)
1359 goto out;
1360 rv = check_nfsd_access(exp, rqstp);
1361 out:
1362 exp_put(exp);
1363 return rv;
1364 }
1365
1366 /* Iterator */
1367
1368 static void *e_start(struct seq_file *m, loff_t *pos)
1369 __acquires(svc_export_cache.hash_lock)
1370 {
1371 loff_t n = *pos;
1372 unsigned hash, export;
1373 struct cache_head *ch;
1374
1375 exp_readlock();
1376 read_lock(&svc_export_cache.hash_lock);
1377 if (!n--)
1378 return SEQ_START_TOKEN;
1379 hash = n >> 32;
1380 export = n & ((1LL<<32) - 1);
1381
1382
1383 for (ch=export_table[hash]; ch; ch=ch->next)
1384 if (!export--)
1385 return ch;
1386 n &= ~((1LL<<32) - 1);
1387 do {
1388 hash++;
1389 n += 1LL<<32;
1390 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1391 if (hash >= EXPORT_HASHMAX)
1392 return NULL;
1393 *pos = n+1;
1394 return export_table[hash];
1395 }
1396
1397 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1398 {
1399 struct cache_head *ch = p;
1400 int hash = (*pos >> 32);
1401
1402 if (p == SEQ_START_TOKEN)
1403 hash = 0;
1404 else if (ch->next == NULL) {
1405 hash++;
1406 *pos += 1LL<<32;
1407 } else {
1408 ++*pos;
1409 return ch->next;
1410 }
1411 *pos &= ~((1LL<<32) - 1);
1412 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1413 hash++;
1414 *pos += 1LL<<32;
1415 }
1416 if (hash >= EXPORT_HASHMAX)
1417 return NULL;
1418 ++*pos;
1419 return export_table[hash];
1420 }
1421
1422 static void e_stop(struct seq_file *m, void *p)
1423 __releases(svc_export_cache.hash_lock)
1424 {
1425 read_unlock(&svc_export_cache.hash_lock);
1426 exp_readunlock();
1427 }
1428
1429 static struct flags {
1430 int flag;
1431 char *name[2];
1432 } expflags[] = {
1433 { NFSEXP_READONLY, {"ro", "rw"}},
1434 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1435 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1436 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1437 { NFSEXP_ASYNC, {"async", "sync"}},
1438 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1439 { NFSEXP_NOHIDE, {"nohide", ""}},
1440 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1441 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1442 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1443 #ifdef MSNFS
1444 { NFSEXP_MSNFS, {"msnfs", ""}},
1445 #endif
1446 { 0, {"", ""}}
1447 };
1448
1449 static void show_expflags(struct seq_file *m, int flags, int mask)
1450 {
1451 struct flags *flg;
1452 int state, first = 0;
1453
1454 for (flg = expflags; flg->flag; flg++) {
1455 if (flg->flag & ~mask)
1456 continue;
1457 state = (flg->flag & flags) ? 0 : 1;
1458 if (*flg->name[state])
1459 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1460 }
1461 }
1462
1463 static void show_secinfo_flags(struct seq_file *m, int flags)
1464 {
1465 seq_printf(m, ",");
1466 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1467 }
1468
1469 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1470 {
1471 struct exp_flavor_info *f;
1472 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1473 int lastflags = 0, first = 0;
1474
1475 if (exp->ex_nflavors == 0)
1476 return;
1477 for (f = exp->ex_flavors; f < end; f++) {
1478 if (first || f->flags != lastflags) {
1479 if (!first)
1480 show_secinfo_flags(m, lastflags);
1481 seq_printf(m, ",sec=%d", f->pseudoflavor);
1482 lastflags = f->flags;
1483 } else {
1484 seq_printf(m, ":%d", f->pseudoflavor);
1485 }
1486 }
1487 show_secinfo_flags(m, lastflags);
1488 }
1489
1490 static void exp_flags(struct seq_file *m, int flag, int fsid,
1491 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1492 {
1493 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1494 if (flag & NFSEXP_FSID)
1495 seq_printf(m, ",fsid=%d", fsid);
1496 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1497 seq_printf(m, ",anonuid=%u", anonu);
1498 if (anong != (gid_t)-2 && anong != (0x10000-2))
1499 seq_printf(m, ",anongid=%u", anong);
1500 if (fsloc && fsloc->locations_count > 0) {
1501 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1502 int i;
1503
1504 seq_printf(m, ",%s=", loctype);
1505 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1506 seq_putc(m, '@');
1507 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1508 for (i = 1; i < fsloc->locations_count; i++) {
1509 seq_putc(m, ';');
1510 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1511 seq_putc(m, '@');
1512 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1513 }
1514 }
1515 }
1516
1517 static int e_show(struct seq_file *m, void *p)
1518 {
1519 struct cache_head *cp = p;
1520 struct svc_export *exp = container_of(cp, struct svc_export, h);
1521
1522 if (p == SEQ_START_TOKEN) {
1523 seq_puts(m, "# Version 1.1\n");
1524 seq_puts(m, "# Path Client(Flags) # IPs\n");
1525 return 0;
1526 }
1527
1528 cache_get(&exp->h);
1529 if (cache_check(&svc_export_cache, &exp->h, NULL))
1530 return 0;
1531 cache_put(&exp->h, &svc_export_cache);
1532 return svc_export_show(m, &svc_export_cache, cp);
1533 }
1534
1535 struct seq_operations nfs_exports_op = {
1536 .start = e_start,
1537 .next = e_next,
1538 .stop = e_stop,
1539 .show = e_show,
1540 };
1541
1542 /*
1543 * Add or modify a client.
1544 * Change requests may involve the list of host addresses. The list of
1545 * exports and possibly existing uid maps are left untouched.
1546 */
1547 int
1548 exp_addclient(struct nfsctl_client *ncp)
1549 {
1550 struct auth_domain *dom;
1551 int i, err;
1552 struct in6_addr addr6;
1553
1554 /* First, consistency check. */
1555 err = -EINVAL;
1556 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1557 goto out;
1558 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1559 goto out;
1560
1561 /* Lock the hashtable */
1562 exp_writelock();
1563
1564 dom = unix_domain_find(ncp->cl_ident);
1565
1566 err = -ENOMEM;
1567 if (!dom)
1568 goto out_unlock;
1569
1570 /* Insert client into hashtable. */
1571 for (i = 0; i < ncp->cl_naddr; i++) {
1572 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1573 auth_unix_add_addr(&addr6, dom);
1574 }
1575 auth_unix_forget_old(dom);
1576 auth_domain_put(dom);
1577
1578 err = 0;
1579
1580 out_unlock:
1581 exp_writeunlock();
1582 out:
1583 return err;
1584 }
1585
1586 /*
1587 * Delete a client given an identifier.
1588 */
1589 int
1590 exp_delclient(struct nfsctl_client *ncp)
1591 {
1592 int err;
1593 struct auth_domain *dom;
1594
1595 err = -EINVAL;
1596 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1597 goto out;
1598
1599 /* Lock the hashtable */
1600 exp_writelock();
1601
1602 dom = auth_domain_find(ncp->cl_ident);
1603 /* just make sure that no addresses work
1604 * and that it will expire soon
1605 */
1606 if (dom) {
1607 err = auth_unix_forget_old(dom);
1608 auth_domain_put(dom);
1609 }
1610
1611 exp_writeunlock();
1612 out:
1613 return err;
1614 }
1615
1616 /*
1617 * Verify that string is non-empty and does not exceed max length.
1618 */
1619 static int
1620 exp_verify_string(char *cp, int max)
1621 {
1622 int i;
1623
1624 for (i = 0; i < max; i++)
1625 if (!cp[i])
1626 return i;
1627 cp[i] = 0;
1628 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1629 return 0;
1630 }
1631
1632 /*
1633 * Initialize the exports module.
1634 */
1635 int
1636 nfsd_export_init(void)
1637 {
1638 int rv;
1639 dprintk("nfsd: initializing export module.\n");
1640
1641 rv = cache_register(&svc_export_cache);
1642 if (rv)
1643 return rv;
1644 rv = cache_register(&svc_expkey_cache);
1645 if (rv)
1646 cache_unregister(&svc_export_cache);
1647 return rv;
1648
1649 }
1650
1651 /*
1652 * Flush exports table - called when last nfsd thread is killed
1653 */
1654 void
1655 nfsd_export_flush(void)
1656 {
1657 exp_writelock();
1658 cache_purge(&svc_expkey_cache);
1659 cache_purge(&svc_export_cache);
1660 exp_writeunlock();
1661 }
1662
1663 /*
1664 * Shutdown the exports module.
1665 */
1666 void
1667 nfsd_export_shutdown(void)
1668 {
1669
1670 dprintk("nfsd: shutting down export module.\n");
1671
1672 exp_writelock();
1673
1674 cache_unregister(&svc_expkey_cache);
1675 cache_unregister(&svc_export_cache);
1676 svcauth_unix_purge();
1677
1678 exp_writeunlock();
1679 dprintk("nfsd: export shutdown complete.\n");
1680 }
Linux kernel - Deliverables
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