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[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 * Just a quick sanity check; we could also try to check
468 * whether this pseudoflavor is supported, but at worst
469 * an unsupported pseudoflavor on the export would just
470 * be a pseudoflavor that won't match the flavor of any
471 * authenticated request. The administrator will
472 * probably discover the problem when someone fails to
473 * authenticate.
474 */
475 if (f->pseudoflavor < 0)
476 return -EINVAL;
477 err = get_int(mesg, &f->flags);
478 if (err)
479 return err;
480 /* Only some flags are allowed to differ between flavors: */
481 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
482 return -EINVAL;
483 }
484 exp->ex_nflavors = listsize;
485 return 0;
486 }
487
488 #else /* CONFIG_NFSD_V4 */
489 static inline int
490 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
491 static inline int
492 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
493 #endif
494
495 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
496 {
497 /* client path expiry [flags anonuid anongid fsid] */
498 char *buf;
499 int len;
500 int err;
501 struct auth_domain *dom = NULL;
502 struct svc_export exp = {}, *expp;
503 int an_int;
504
505 if (mesg[mlen-1] != '\n')
506 return -EINVAL;
507 mesg[mlen-1] = 0;
508
509 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
510 if (!buf)
511 return -ENOMEM;
512
513 /* client */
514 err = -EINVAL;
515 len = qword_get(&mesg, buf, PAGE_SIZE);
516 if (len <= 0)
517 goto out;
518
519 err = -ENOENT;
520 dom = auth_domain_find(buf);
521 if (!dom)
522 goto out;
523
524 /* path */
525 err = -EINVAL;
526 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
527 goto out1;
528
529 err = kern_path(buf, 0, &exp.ex_path);
530 if (err)
531 goto out1;
532
533 exp.ex_client = dom;
534
535 err = -ENOMEM;
536 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
537 if (!exp.ex_pathname)
538 goto out2;
539
540 /* expiry */
541 err = -EINVAL;
542 exp.h.expiry_time = get_expiry(&mesg);
543 if (exp.h.expiry_time == 0)
544 goto out3;
545
546 /* flags */
547 err = get_int(&mesg, &an_int);
548 if (err == -ENOENT) {
549 err = 0;
550 set_bit(CACHE_NEGATIVE, &exp.h.flags);
551 } else {
552 if (err || an_int < 0)
553 goto out3;
554 exp.ex_flags= an_int;
555
556 /* anon uid */
557 err = get_int(&mesg, &an_int);
558 if (err)
559 goto out3;
560 exp.ex_anon_uid= an_int;
561
562 /* anon gid */
563 err = get_int(&mesg, &an_int);
564 if (err)
565 goto out3;
566 exp.ex_anon_gid= an_int;
567
568 /* fsid */
569 err = get_int(&mesg, &an_int);
570 if (err)
571 goto out3;
572 exp.ex_fsid = an_int;
573
574 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
575 if (strcmp(buf, "fsloc") == 0)
576 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
577 else if (strcmp(buf, "uuid") == 0) {
578 /* expect a 16 byte uuid encoded as \xXXXX... */
579 len = qword_get(&mesg, buf, PAGE_SIZE);
580 if (len != 16)
581 err = -EINVAL;
582 else {
583 exp.ex_uuid =
584 kmemdup(buf, 16, GFP_KERNEL);
585 if (exp.ex_uuid == NULL)
586 err = -ENOMEM;
587 }
588 } else if (strcmp(buf, "secinfo") == 0)
589 err = secinfo_parse(&mesg, buf, &exp);
590 else
591 /* quietly ignore unknown words and anything
592 * following. Newer user-space can try to set
593 * new values, then see what the result was.
594 */
595 break;
596 if (err)
597 goto out4;
598 }
599
600 err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
601 exp.ex_uuid);
602 if (err)
603 goto out4;
604 }
605
606 expp = svc_export_lookup(&exp);
607 if (expp)
608 expp = svc_export_update(&exp, expp);
609 else
610 err = -ENOMEM;
611 cache_flush();
612 if (expp == NULL)
613 err = -ENOMEM;
614 else
615 exp_put(expp);
616 out4:
617 nfsd4_fslocs_free(&exp.ex_fslocs);
618 kfree(exp.ex_uuid);
619 out3:
620 kfree(exp.ex_pathname);
621 out2:
622 path_put(&exp.ex_path);
623 out1:
624 auth_domain_put(dom);
625 out:
626 kfree(buf);
627 return err;
628 }
629
630 static void exp_flags(struct seq_file *m, int flag, int fsid,
631 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
632 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
633
634 static int svc_export_show(struct seq_file *m,
635 struct cache_detail *cd,
636 struct cache_head *h)
637 {
638 struct svc_export *exp ;
639
640 if (h ==NULL) {
641 seq_puts(m, "#path domain(flags)\n");
642 return 0;
643 }
644 exp = container_of(h, struct svc_export, h);
645 seq_path(m, &exp->ex_path, " \t\n\\");
646 seq_putc(m, '\t');
647 seq_escape(m, exp->ex_client->name, " \t\n\\");
648 seq_putc(m, '(');
649 if (test_bit(CACHE_VALID, &h->flags) &&
650 !test_bit(CACHE_NEGATIVE, &h->flags)) {
651 exp_flags(m, exp->ex_flags, exp->ex_fsid,
652 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
653 if (exp->ex_uuid) {
654 int i;
655 seq_puts(m, ",uuid=");
656 for (i=0; i<16; i++) {
657 if ((i&3) == 0 && i)
658 seq_putc(m, ':');
659 seq_printf(m, "%02x", exp->ex_uuid[i]);
660 }
661 }
662 show_secinfo(m, exp);
663 }
664 seq_puts(m, ")\n");
665 return 0;
666 }
667 static int svc_export_match(struct cache_head *a, struct cache_head *b)
668 {
669 struct svc_export *orig = container_of(a, struct svc_export, h);
670 struct svc_export *new = container_of(b, struct svc_export, h);
671 return orig->ex_client == new->ex_client &&
672 orig->ex_path.dentry == new->ex_path.dentry &&
673 orig->ex_path.mnt == new->ex_path.mnt;
674 }
675
676 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
677 {
678 struct svc_export *new = container_of(cnew, struct svc_export, h);
679 struct svc_export *item = container_of(citem, struct svc_export, h);
680
681 kref_get(&item->ex_client->ref);
682 new->ex_client = item->ex_client;
683 new->ex_path.dentry = dget(item->ex_path.dentry);
684 new->ex_path.mnt = mntget(item->ex_path.mnt);
685 new->ex_pathname = NULL;
686 new->ex_fslocs.locations = NULL;
687 new->ex_fslocs.locations_count = 0;
688 new->ex_fslocs.migrated = 0;
689 }
690
691 static void export_update(struct cache_head *cnew, struct cache_head *citem)
692 {
693 struct svc_export *new = container_of(cnew, struct svc_export, h);
694 struct svc_export *item = container_of(citem, struct svc_export, h);
695 int i;
696
697 new->ex_flags = item->ex_flags;
698 new->ex_anon_uid = item->ex_anon_uid;
699 new->ex_anon_gid = item->ex_anon_gid;
700 new->ex_fsid = item->ex_fsid;
701 new->ex_uuid = item->ex_uuid;
702 item->ex_uuid = NULL;
703 new->ex_pathname = item->ex_pathname;
704 item->ex_pathname = NULL;
705 new->ex_fslocs.locations = item->ex_fslocs.locations;
706 item->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
708 item->ex_fslocs.locations_count = 0;
709 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
710 item->ex_fslocs.migrated = 0;
711 new->ex_nflavors = item->ex_nflavors;
712 for (i = 0; i < MAX_SECINFO_LIST; i++) {
713 new->ex_flavors[i] = item->ex_flavors[i];
714 }
715 }
716
717 static struct cache_head *svc_export_alloc(void)
718 {
719 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
720 if (i)
721 return &i->h;
722 else
723 return NULL;
724 }
725
726 struct cache_detail svc_export_cache = {
727 .owner = THIS_MODULE,
728 .hash_size = EXPORT_HASHMAX,
729 .hash_table = export_table,
730 .name = "nfsd.export",
731 .cache_put = svc_export_put,
732 .cache_request = svc_export_request,
733 .cache_parse = svc_export_parse,
734 .cache_show = svc_export_show,
735 .match = svc_export_match,
736 .init = svc_export_init,
737 .update = export_update,
738 .alloc = svc_export_alloc,
739 };
740
741 static struct svc_export *
742 svc_export_lookup(struct svc_export *exp)
743 {
744 struct cache_head *ch;
745 int hash;
746 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
747 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
749
750 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
751 hash);
752 if (ch)
753 return container_of(ch, struct svc_export, h);
754 else
755 return NULL;
756 }
757
758 static struct svc_export *
759 svc_export_update(struct svc_export *new, struct svc_export *old)
760 {
761 struct cache_head *ch;
762 int hash;
763 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
764 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
765 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
766
767 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
768 &old->h,
769 hash);
770 if (ch)
771 return container_of(ch, struct svc_export, h);
772 else
773 return NULL;
774 }
775
776
777 static struct svc_expkey *
778 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
779 {
780 struct svc_expkey key, *ek;
781 int err;
782
783 if (!clp)
784 return ERR_PTR(-ENOENT);
785
786 key.ek_client = clp;
787 key.ek_fsidtype = fsid_type;
788 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
789
790 ek = svc_expkey_lookup(&key);
791 if (ek == NULL)
792 return ERR_PTR(-ENOMEM);
793 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
794 if (err)
795 return ERR_PTR(err);
796 return ek;
797 }
798
799 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
800 struct svc_export *exp)
801 {
802 struct svc_expkey key, *ek;
803
804 key.ek_client = clp;
805 key.ek_fsidtype = fsid_type;
806 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
807 key.ek_path = exp->ex_path;
808 key.h.expiry_time = NEVER;
809 key.h.flags = 0;
810
811 ek = svc_expkey_lookup(&key);
812 if (ek)
813 ek = svc_expkey_update(&key,ek);
814 if (ek) {
815 cache_put(&ek->h, &svc_expkey_cache);
816 return 0;
817 }
818 return -ENOMEM;
819 }
820
821 /*
822 * Find the client's export entry matching xdev/xino.
823 */
824 static inline struct svc_expkey *
825 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
826 {
827 u32 fsidv[3];
828
829 if (old_valid_dev(dev)) {
830 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
831 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
832 }
833 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
834 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
835 }
836
837 /*
838 * Find the client's export entry matching fsid
839 */
840 static inline struct svc_expkey *
841 exp_get_fsid_key(svc_client *clp, int fsid)
842 {
843 u32 fsidv[2];
844
845 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
846
847 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
848 }
849
850 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
851 struct cache_req *reqp)
852 {
853 struct svc_export *exp, key;
854 int err;
855
856 if (!clp)
857 return ERR_PTR(-ENOENT);
858
859 key.ex_client = clp;
860 key.ex_path = *path;
861
862 exp = svc_export_lookup(&key);
863 if (exp == NULL)
864 return ERR_PTR(-ENOMEM);
865 err = cache_check(&svc_export_cache, &exp->h, reqp);
866 if (err)
867 return ERR_PTR(err);
868 return exp;
869 }
870
871 /*
872 * Find the export entry for a given dentry.
873 */
874 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
875 {
876 struct dentry *saved = dget(path->dentry);
877 svc_export *exp = exp_get_by_name(clp, path, NULL);
878
879 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
880 struct dentry *parent = dget_parent(path->dentry);
881 dput(path->dentry);
882 path->dentry = parent;
883 exp = exp_get_by_name(clp, path, NULL);
884 }
885 dput(path->dentry);
886 path->dentry = saved;
887 return exp;
888 }
889
890 /*
891 * Hashtable locking. Write locks are placed only by user processes
892 * wanting to modify export information.
893 * Write locking only done in this file. Read locking
894 * needed externally.
895 */
896
897 static DECLARE_RWSEM(hash_sem);
898
899 void
900 exp_readlock(void)
901 {
902 down_read(&hash_sem);
903 }
904
905 static inline void
906 exp_writelock(void)
907 {
908 down_write(&hash_sem);
909 }
910
911 void
912 exp_readunlock(void)
913 {
914 up_read(&hash_sem);
915 }
916
917 static inline void
918 exp_writeunlock(void)
919 {
920 up_write(&hash_sem);
921 }
922
923 static void exp_fsid_unhash(struct svc_export *exp)
924 {
925 struct svc_expkey *ek;
926
927 if ((exp->ex_flags & NFSEXP_FSID) == 0)
928 return;
929
930 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
931 if (!IS_ERR(ek)) {
932 ek->h.expiry_time = get_seconds()-1;
933 cache_put(&ek->h, &svc_expkey_cache);
934 }
935 svc_expkey_cache.nextcheck = get_seconds();
936 }
937
938 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
939 {
940 u32 fsid[2];
941
942 if ((exp->ex_flags & NFSEXP_FSID) == 0)
943 return 0;
944
945 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
946 return exp_set_key(clp, FSID_NUM, fsid, exp);
947 }
948
949 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
950 {
951 u32 fsid[2];
952 struct inode *inode = exp->ex_path.dentry->d_inode;
953 dev_t dev = inode->i_sb->s_dev;
954
955 if (old_valid_dev(dev)) {
956 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
957 return exp_set_key(clp, FSID_DEV, fsid, exp);
958 }
959 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
960 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
961 }
962
963 static void exp_unhash(struct svc_export *exp)
964 {
965 struct svc_expkey *ek;
966 struct inode *inode = exp->ex_path.dentry->d_inode;
967
968 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
969 if (!IS_ERR(ek)) {
970 ek->h.expiry_time = get_seconds()-1;
971 cache_put(&ek->h, &svc_expkey_cache);
972 }
973 svc_expkey_cache.nextcheck = get_seconds();
974 }
975
976 /*
977 * Export a file system.
978 */
979 int
980 exp_export(struct nfsctl_export *nxp)
981 {
982 svc_client *clp;
983 struct svc_export *exp = NULL;
984 struct svc_export new;
985 struct svc_expkey *fsid_key = NULL;
986 struct path path;
987 int err;
988
989 /* Consistency check */
990 err = -EINVAL;
991 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
992 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
993 goto out;
994
995 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
996 nxp->ex_client, nxp->ex_path,
997 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
998 nxp->ex_flags);
999
1000 /* Try to lock the export table for update */
1001 exp_writelock();
1002
1003 /* Look up client info */
1004 if (!(clp = auth_domain_find(nxp->ex_client)))
1005 goto out_unlock;
1006
1007
1008 /* Look up the dentry */
1009 err = kern_path(nxp->ex_path, 0, &path);
1010 if (err)
1011 goto out_put_clp;
1012 err = -EINVAL;
1013
1014 exp = exp_get_by_name(clp, &path, NULL);
1015
1016 memset(&new, 0, sizeof(new));
1017
1018 /* must make sure there won't be an ex_fsid clash */
1019 if ((nxp->ex_flags & NFSEXP_FSID) &&
1020 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1021 fsid_key->ek_path.mnt &&
1022 (fsid_key->ek_path.mnt != path.mnt ||
1023 fsid_key->ek_path.dentry != path.dentry))
1024 goto finish;
1025
1026 if (!IS_ERR(exp)) {
1027 /* just a flags/id/fsid update */
1028
1029 exp_fsid_unhash(exp);
1030 exp->ex_flags = nxp->ex_flags;
1031 exp->ex_anon_uid = nxp->ex_anon_uid;
1032 exp->ex_anon_gid = nxp->ex_anon_gid;
1033 exp->ex_fsid = nxp->ex_dev;
1034
1035 err = exp_fsid_hash(clp, exp);
1036 goto finish;
1037 }
1038
1039 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1040 if (err) goto finish;
1041
1042 err = -ENOMEM;
1043
1044 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1045
1046 new.h.expiry_time = NEVER;
1047 new.h.flags = 0;
1048 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1049 if (!new.ex_pathname)
1050 goto finish;
1051 new.ex_client = clp;
1052 new.ex_path = path;
1053 new.ex_flags = nxp->ex_flags;
1054 new.ex_anon_uid = nxp->ex_anon_uid;
1055 new.ex_anon_gid = nxp->ex_anon_gid;
1056 new.ex_fsid = nxp->ex_dev;
1057
1058 exp = svc_export_lookup(&new);
1059 if (exp)
1060 exp = svc_export_update(&new, exp);
1061
1062 if (!exp)
1063 goto finish;
1064
1065 if (exp_hash(clp, exp) ||
1066 exp_fsid_hash(clp, exp)) {
1067 /* failed to create at least one index */
1068 exp_do_unexport(exp);
1069 cache_flush();
1070 } else
1071 err = 0;
1072 finish:
1073 kfree(new.ex_pathname);
1074 if (exp)
1075 exp_put(exp);
1076 if (fsid_key && !IS_ERR(fsid_key))
1077 cache_put(&fsid_key->h, &svc_expkey_cache);
1078 path_put(&path);
1079 out_put_clp:
1080 auth_domain_put(clp);
1081 out_unlock:
1082 exp_writeunlock();
1083 out:
1084 return err;
1085 }
1086
1087 /*
1088 * Unexport a file system. The export entry has already
1089 * been removed from the client's list of exported fs's.
1090 */
1091 static void
1092 exp_do_unexport(svc_export *unexp)
1093 {
1094 unexp->h.expiry_time = get_seconds()-1;
1095 svc_export_cache.nextcheck = get_seconds();
1096 exp_unhash(unexp);
1097 exp_fsid_unhash(unexp);
1098 }
1099
1100
1101 /*
1102 * unexport syscall.
1103 */
1104 int
1105 exp_unexport(struct nfsctl_export *nxp)
1106 {
1107 struct auth_domain *dom;
1108 svc_export *exp;
1109 struct path path;
1110 int err;
1111
1112 /* Consistency check */
1113 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1114 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1115 return -EINVAL;
1116
1117 exp_writelock();
1118
1119 err = -EINVAL;
1120 dom = auth_domain_find(nxp->ex_client);
1121 if (!dom) {
1122 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1123 goto out_unlock;
1124 }
1125
1126 err = kern_path(nxp->ex_path, 0, &path);
1127 if (err)
1128 goto out_domain;
1129
1130 err = -EINVAL;
1131 exp = exp_get_by_name(dom, &path, NULL);
1132 path_put(&path);
1133 if (IS_ERR(exp))
1134 goto out_domain;
1135
1136 exp_do_unexport(exp);
1137 exp_put(exp);
1138 err = 0;
1139
1140 out_domain:
1141 auth_domain_put(dom);
1142 cache_flush();
1143 out_unlock:
1144 exp_writeunlock();
1145 return err;
1146 }
1147
1148 /*
1149 * Obtain the root fh on behalf of a client.
1150 * This could be done in user space, but I feel that it adds some safety
1151 * since its harder to fool a kernel module than a user space program.
1152 */
1153 int
1154 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1155 {
1156 struct svc_export *exp;
1157 struct path path;
1158 struct inode *inode;
1159 struct svc_fh fh;
1160 int err;
1161
1162 err = -EPERM;
1163 /* NB: we probably ought to check that it's NUL-terminated */
1164 if (kern_path(name, 0, &path)) {
1165 printk("nfsd: exp_rootfh path not found %s", name);
1166 return err;
1167 }
1168 inode = path.dentry->d_inode;
1169
1170 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1171 name, path.dentry, clp->name,
1172 inode->i_sb->s_id, inode->i_ino);
1173 exp = exp_parent(clp, &path);
1174 if (IS_ERR(exp)) {
1175 err = PTR_ERR(exp);
1176 goto out;
1177 }
1178
1179 /*
1180 * fh must be initialized before calling fh_compose
1181 */
1182 fh_init(&fh, maxsize);
1183 if (fh_compose(&fh, exp, path.dentry, NULL))
1184 err = -EINVAL;
1185 else
1186 err = 0;
1187 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1188 fh_put(&fh);
1189 exp_put(exp);
1190 out:
1191 path_put(&path);
1192 return err;
1193 }
1194
1195 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1196 u32 *fsidv, struct cache_req *reqp)
1197 {
1198 struct svc_export *exp;
1199 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1200 if (IS_ERR(ek))
1201 return ERR_CAST(ek);
1202
1203 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1204 cache_put(&ek->h, &svc_expkey_cache);
1205
1206 if (IS_ERR(exp))
1207 return ERR_CAST(exp);
1208 return exp;
1209 }
1210
1211 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1212 {
1213 struct exp_flavor_info *f;
1214 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1215
1216 /* legacy gss-only clients are always OK: */
1217 if (exp->ex_client == rqstp->rq_gssclient)
1218 return 0;
1219 /* ip-address based client; check sec= export option: */
1220 for (f = exp->ex_flavors; f < end; f++) {
1221 if (f->pseudoflavor == rqstp->rq_flavor)
1222 return 0;
1223 }
1224 /* defaults in absence of sec= options: */
1225 if (exp->ex_nflavors == 0) {
1226 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1227 rqstp->rq_flavor == RPC_AUTH_UNIX)
1228 return 0;
1229 }
1230 return nfserr_wrongsec;
1231 }
1232
1233 /*
1234 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1235 * auth_unix client) if it's available and has secinfo information;
1236 * otherwise, will try to use rq_gssclient.
1237 *
1238 * Called from functions that handle requests; functions that do work on
1239 * behalf of mountd are passed a single client name to use, and should
1240 * use exp_get_by_name() or exp_find().
1241 */
1242 struct svc_export *
1243 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1244 {
1245 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1246
1247 if (rqstp->rq_client == NULL)
1248 goto gss;
1249
1250 /* First try the auth_unix client: */
1251 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1252 if (PTR_ERR(exp) == -ENOENT)
1253 goto gss;
1254 if (IS_ERR(exp))
1255 return exp;
1256 /* If it has secinfo, assume there are no gss/... clients */
1257 if (exp->ex_nflavors > 0)
1258 return exp;
1259 gss:
1260 /* Otherwise, try falling back on gss client */
1261 if (rqstp->rq_gssclient == NULL)
1262 return exp;
1263 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1264 if (PTR_ERR(gssexp) == -ENOENT)
1265 return exp;
1266 if (!IS_ERR(exp))
1267 exp_put(exp);
1268 return gssexp;
1269 }
1270
1271 struct svc_export *
1272 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1273 {
1274 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1275
1276 if (rqstp->rq_client == NULL)
1277 goto gss;
1278
1279 /* First try the auth_unix client: */
1280 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1281 if (PTR_ERR(exp) == -ENOENT)
1282 goto gss;
1283 if (IS_ERR(exp))
1284 return exp;
1285 /* If it has secinfo, assume there are no gss/... clients */
1286 if (exp->ex_nflavors > 0)
1287 return exp;
1288 gss:
1289 /* Otherwise, try falling back on gss client */
1290 if (rqstp->rq_gssclient == NULL)
1291 return exp;
1292 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1293 &rqstp->rq_chandle);
1294 if (PTR_ERR(gssexp) == -ENOENT)
1295 return exp;
1296 if (!IS_ERR(exp))
1297 exp_put(exp);
1298 return gssexp;
1299 }
1300
1301 struct svc_export *
1302 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1303 {
1304 struct dentry *saved = dget(path->dentry);
1305 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1306
1307 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1308 struct dentry *parent = dget_parent(path->dentry);
1309 dput(path->dentry);
1310 path->dentry = parent;
1311 exp = rqst_exp_get_by_name(rqstp, path);
1312 }
1313 dput(path->dentry);
1314 path->dentry = saved;
1315 return exp;
1316 }
1317
1318 /*
1319 * Called when we need the filehandle for the root of the pseudofs,
1320 * for a given NFSv4 client. The root is defined to be the
1321 * export point with fsid==0
1322 */
1323 __be32
1324 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1325 {
1326 struct svc_export *exp;
1327 __be32 rv;
1328 u32 fsidv[2];
1329
1330 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1331
1332 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1333 if (IS_ERR(exp))
1334 return nfserrno(PTR_ERR(exp));
1335 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1336 if (rv)
1337 goto out;
1338 rv = check_nfsd_access(exp, rqstp);
1339 out:
1340 exp_put(exp);
1341 return rv;
1342 }
1343
1344 /* Iterator */
1345
1346 static void *e_start(struct seq_file *m, loff_t *pos)
1347 __acquires(svc_export_cache.hash_lock)
1348 {
1349 loff_t n = *pos;
1350 unsigned hash, export;
1351 struct cache_head *ch;
1352
1353 exp_readlock();
1354 read_lock(&svc_export_cache.hash_lock);
1355 if (!n--)
1356 return SEQ_START_TOKEN;
1357 hash = n >> 32;
1358 export = n & ((1LL<<32) - 1);
1359
1360
1361 for (ch=export_table[hash]; ch; ch=ch->next)
1362 if (!export--)
1363 return ch;
1364 n &= ~((1LL<<32) - 1);
1365 do {
1366 hash++;
1367 n += 1LL<<32;
1368 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1369 if (hash >= EXPORT_HASHMAX)
1370 return NULL;
1371 *pos = n+1;
1372 return export_table[hash];
1373 }
1374
1375 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1376 {
1377 struct cache_head *ch = p;
1378 int hash = (*pos >> 32);
1379
1380 if (p == SEQ_START_TOKEN)
1381 hash = 0;
1382 else if (ch->next == NULL) {
1383 hash++;
1384 *pos += 1LL<<32;
1385 } else {
1386 ++*pos;
1387 return ch->next;
1388 }
1389 *pos &= ~((1LL<<32) - 1);
1390 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1391 hash++;
1392 *pos += 1LL<<32;
1393 }
1394 if (hash >= EXPORT_HASHMAX)
1395 return NULL;
1396 ++*pos;
1397 return export_table[hash];
1398 }
1399
1400 static void e_stop(struct seq_file *m, void *p)
1401 __releases(svc_export_cache.hash_lock)
1402 {
1403 read_unlock(&svc_export_cache.hash_lock);
1404 exp_readunlock();
1405 }
1406
1407 static struct flags {
1408 int flag;
1409 char *name[2];
1410 } expflags[] = {
1411 { NFSEXP_READONLY, {"ro", "rw"}},
1412 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1413 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1414 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1415 { NFSEXP_ASYNC, {"async", "sync"}},
1416 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1417 { NFSEXP_NOHIDE, {"nohide", ""}},
1418 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1419 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1420 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1421 #ifdef MSNFS
1422 { NFSEXP_MSNFS, {"msnfs", ""}},
1423 #endif
1424 { 0, {"", ""}}
1425 };
1426
1427 static void show_expflags(struct seq_file *m, int flags, int mask)
1428 {
1429 struct flags *flg;
1430 int state, first = 0;
1431
1432 for (flg = expflags; flg->flag; flg++) {
1433 if (flg->flag & ~mask)
1434 continue;
1435 state = (flg->flag & flags) ? 0 : 1;
1436 if (*flg->name[state])
1437 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1438 }
1439 }
1440
1441 static void show_secinfo_flags(struct seq_file *m, int flags)
1442 {
1443 seq_printf(m, ",");
1444 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1445 }
1446
1447 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1448 {
1449 struct exp_flavor_info *f;
1450 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1451 int lastflags = 0, first = 0;
1452
1453 if (exp->ex_nflavors == 0)
1454 return;
1455 for (f = exp->ex_flavors; f < end; f++) {
1456 if (first || f->flags != lastflags) {
1457 if (!first)
1458 show_secinfo_flags(m, lastflags);
1459 seq_printf(m, ",sec=%d", f->pseudoflavor);
1460 lastflags = f->flags;
1461 } else {
1462 seq_printf(m, ":%d", f->pseudoflavor);
1463 }
1464 }
1465 show_secinfo_flags(m, lastflags);
1466 }
1467
1468 static void exp_flags(struct seq_file *m, int flag, int fsid,
1469 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1470 {
1471 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1472 if (flag & NFSEXP_FSID)
1473 seq_printf(m, ",fsid=%d", fsid);
1474 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1475 seq_printf(m, ",anonuid=%u", anonu);
1476 if (anong != (gid_t)-2 && anong != (0x10000-2))
1477 seq_printf(m, ",anongid=%u", anong);
1478 if (fsloc && fsloc->locations_count > 0) {
1479 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1480 int i;
1481
1482 seq_printf(m, ",%s=", loctype);
1483 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1484 seq_putc(m, '@');
1485 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1486 for (i = 1; i < fsloc->locations_count; i++) {
1487 seq_putc(m, ';');
1488 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1489 seq_putc(m, '@');
1490 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1491 }
1492 }
1493 }
1494
1495 static int e_show(struct seq_file *m, void *p)
1496 {
1497 struct cache_head *cp = p;
1498 struct svc_export *exp = container_of(cp, struct svc_export, h);
1499
1500 if (p == SEQ_START_TOKEN) {
1501 seq_puts(m, "# Version 1.1\n");
1502 seq_puts(m, "# Path Client(Flags) # IPs\n");
1503 return 0;
1504 }
1505
1506 cache_get(&exp->h);
1507 if (cache_check(&svc_export_cache, &exp->h, NULL))
1508 return 0;
1509 cache_put(&exp->h, &svc_export_cache);
1510 return svc_export_show(m, &svc_export_cache, cp);
1511 }
1512
1513 struct seq_operations nfs_exports_op = {
1514 .start = e_start,
1515 .next = e_next,
1516 .stop = e_stop,
1517 .show = e_show,
1518 };
1519
1520 /*
1521 * Add or modify a client.
1522 * Change requests may involve the list of host addresses. The list of
1523 * exports and possibly existing uid maps are left untouched.
1524 */
1525 int
1526 exp_addclient(struct nfsctl_client *ncp)
1527 {
1528 struct auth_domain *dom;
1529 int i, err;
1530 struct in6_addr addr6;
1531
1532 /* First, consistency check. */
1533 err = -EINVAL;
1534 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1535 goto out;
1536 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1537 goto out;
1538
1539 /* Lock the hashtable */
1540 exp_writelock();
1541
1542 dom = unix_domain_find(ncp->cl_ident);
1543
1544 err = -ENOMEM;
1545 if (!dom)
1546 goto out_unlock;
1547
1548 /* Insert client into hashtable. */
1549 for (i = 0; i < ncp->cl_naddr; i++) {
1550 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1551 auth_unix_add_addr(&addr6, dom);
1552 }
1553 auth_unix_forget_old(dom);
1554 auth_domain_put(dom);
1555
1556 err = 0;
1557
1558 out_unlock:
1559 exp_writeunlock();
1560 out:
1561 return err;
1562 }
1563
1564 /*
1565 * Delete a client given an identifier.
1566 */
1567 int
1568 exp_delclient(struct nfsctl_client *ncp)
1569 {
1570 int err;
1571 struct auth_domain *dom;
1572
1573 err = -EINVAL;
1574 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1575 goto out;
1576
1577 /* Lock the hashtable */
1578 exp_writelock();
1579
1580 dom = auth_domain_find(ncp->cl_ident);
1581 /* just make sure that no addresses work
1582 * and that it will expire soon
1583 */
1584 if (dom) {
1585 err = auth_unix_forget_old(dom);
1586 auth_domain_put(dom);
1587 }
1588
1589 exp_writeunlock();
1590 out:
1591 return err;
1592 }
1593
1594 /*
1595 * Verify that string is non-empty and does not exceed max length.
1596 */
1597 static int
1598 exp_verify_string(char *cp, int max)
1599 {
1600 int i;
1601
1602 for (i = 0; i < max; i++)
1603 if (!cp[i])
1604 return i;
1605 cp[i] = 0;
1606 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1607 return 0;
1608 }
1609
1610 /*
1611 * Initialize the exports module.
1612 */
1613 int
1614 nfsd_export_init(void)
1615 {
1616 int rv;
1617 dprintk("nfsd: initializing export module.\n");
1618
1619 rv = cache_register(&svc_export_cache);
1620 if (rv)
1621 return rv;
1622 rv = cache_register(&svc_expkey_cache);
1623 if (rv)
1624 cache_unregister(&svc_export_cache);
1625 return rv;
1626
1627 }
1628
1629 /*
1630 * Flush exports table - called when last nfsd thread is killed
1631 */
1632 void
1633 nfsd_export_flush(void)
1634 {
1635 exp_writelock();
1636 cache_purge(&svc_expkey_cache);
1637 cache_purge(&svc_export_cache);
1638 exp_writeunlock();
1639 }
1640
1641 /*
1642 * Shutdown the exports module.
1643 */
1644 void
1645 nfsd_export_shutdown(void)
1646 {
1647
1648 dprintk("nfsd: shutting down export module.\n");
1649
1650 exp_writelock();
1651
1652 cache_unregister(&svc_expkey_cache);
1653 cache_unregister(&svc_export_cache);
1654 svcauth_unix_purge();
1655
1656 exp_writeunlock();
1657 dprintk("nfsd: export shutdown complete.\n");
1658 }
Linux kernel - Deliverables
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