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rpcgss: remove redundant test on unsigned
[linux-2.6/kvm.git] / fs / nfsd / export.c
blob6eb918153fd41d49529d350c424619df23bc0c3a
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, struct vfsmount *mnt,
846 struct dentry *dentry,
847 struct cache_req *reqp)
848 {
849 struct svc_export *exp, key;
850 int err;
851
852 if (!clp)
853 return ERR_PTR(-ENOENT);
854
855 key.ex_client = clp;
856 key.ex_path.mnt = mnt;
857 key.ex_path.dentry = dentry;
858
859 exp = svc_export_lookup(&key);
860 if (exp == NULL)
861 return ERR_PTR(-ENOMEM);
862 err = cache_check(&svc_export_cache, &exp->h, reqp);
863 if (err)
864 return ERR_PTR(err);
865 return exp;
866 }
867
868 /*
869 * Find the export entry for a given dentry.
870 */
871 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
872 struct dentry *dentry,
873 struct cache_req *reqp)
874 {
875 svc_export *exp;
876
877 dget(dentry);
878 exp = exp_get_by_name(clp, mnt, dentry, reqp);
879
880 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
881 struct dentry *parent;
882
883 parent = dget_parent(dentry);
884 dput(dentry);
885 dentry = parent;
886 exp = exp_get_by_name(clp, mnt, dentry, reqp);
887 }
888 dput(dentry);
889 return exp;
890 }
891
892 /*
893 * Hashtable locking. Write locks are placed only by user processes
894 * wanting to modify export information.
895 * Write locking only done in this file. Read locking
896 * needed externally.
897 */
898
899 static DECLARE_RWSEM(hash_sem);
900
901 void
902 exp_readlock(void)
903 {
904 down_read(&hash_sem);
905 }
906
907 static inline void
908 exp_writelock(void)
909 {
910 down_write(&hash_sem);
911 }
912
913 void
914 exp_readunlock(void)
915 {
916 up_read(&hash_sem);
917 }
918
919 static inline void
920 exp_writeunlock(void)
921 {
922 up_write(&hash_sem);
923 }
924
925 static void exp_fsid_unhash(struct svc_export *exp)
926 {
927 struct svc_expkey *ek;
928
929 if ((exp->ex_flags & NFSEXP_FSID) == 0)
930 return;
931
932 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
933 if (!IS_ERR(ek)) {
934 ek->h.expiry_time = get_seconds()-1;
935 cache_put(&ek->h, &svc_expkey_cache);
936 }
937 svc_expkey_cache.nextcheck = get_seconds();
938 }
939
940 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
941 {
942 u32 fsid[2];
943
944 if ((exp->ex_flags & NFSEXP_FSID) == 0)
945 return 0;
946
947 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
948 return exp_set_key(clp, FSID_NUM, fsid, exp);
949 }
950
951 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
952 {
953 u32 fsid[2];
954 struct inode *inode = exp->ex_path.dentry->d_inode;
955 dev_t dev = inode->i_sb->s_dev;
956
957 if (old_valid_dev(dev)) {
958 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
959 return exp_set_key(clp, FSID_DEV, fsid, exp);
960 }
961 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
962 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
963 }
964
965 static void exp_unhash(struct svc_export *exp)
966 {
967 struct svc_expkey *ek;
968 struct inode *inode = exp->ex_path.dentry->d_inode;
969
970 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
971 if (!IS_ERR(ek)) {
972 ek->h.expiry_time = get_seconds()-1;
973 cache_put(&ek->h, &svc_expkey_cache);
974 }
975 svc_expkey_cache.nextcheck = get_seconds();
976 }
977
978 /*
979 * Export a file system.
980 */
981 int
982 exp_export(struct nfsctl_export *nxp)
983 {
984 svc_client *clp;
985 struct svc_export *exp = NULL;
986 struct svc_export new;
987 struct svc_expkey *fsid_key = NULL;
988 struct path path;
989 int err;
990
991 /* Consistency check */
992 err = -EINVAL;
993 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
994 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
995 goto out;
996
997 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
998 nxp->ex_client, nxp->ex_path,
999 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1000 nxp->ex_flags);
1001
1002 /* Try to lock the export table for update */
1003 exp_writelock();
1004
1005 /* Look up client info */
1006 if (!(clp = auth_domain_find(nxp->ex_client)))
1007 goto out_unlock;
1008
1009
1010 /* Look up the dentry */
1011 err = kern_path(nxp->ex_path, 0, &path);
1012 if (err)
1013 goto out_put_clp;
1014 err = -EINVAL;
1015
1016 exp = exp_get_by_name(clp, path.mnt, path.dentry, NULL);
1017
1018 memset(&new, 0, sizeof(new));
1019
1020 /* must make sure there won't be an ex_fsid clash */
1021 if ((nxp->ex_flags & NFSEXP_FSID) &&
1022 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1023 fsid_key->ek_path.mnt &&
1024 (fsid_key->ek_path.mnt != path.mnt ||
1025 fsid_key->ek_path.dentry != path.dentry))
1026 goto finish;
1027
1028 if (!IS_ERR(exp)) {
1029 /* just a flags/id/fsid update */
1030
1031 exp_fsid_unhash(exp);
1032 exp->ex_flags = nxp->ex_flags;
1033 exp->ex_anon_uid = nxp->ex_anon_uid;
1034 exp->ex_anon_gid = nxp->ex_anon_gid;
1035 exp->ex_fsid = nxp->ex_dev;
1036
1037 err = exp_fsid_hash(clp, exp);
1038 goto finish;
1039 }
1040
1041 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1042 if (err) goto finish;
1043
1044 err = -ENOMEM;
1045
1046 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1047
1048 new.h.expiry_time = NEVER;
1049 new.h.flags = 0;
1050 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1051 if (!new.ex_pathname)
1052 goto finish;
1053 new.ex_client = clp;
1054 new.ex_path = path;
1055 new.ex_flags = nxp->ex_flags;
1056 new.ex_anon_uid = nxp->ex_anon_uid;
1057 new.ex_anon_gid = nxp->ex_anon_gid;
1058 new.ex_fsid = nxp->ex_dev;
1059
1060 exp = svc_export_lookup(&new);
1061 if (exp)
1062 exp = svc_export_update(&new, exp);
1063
1064 if (!exp)
1065 goto finish;
1066
1067 if (exp_hash(clp, exp) ||
1068 exp_fsid_hash(clp, exp)) {
1069 /* failed to create at least one index */
1070 exp_do_unexport(exp);
1071 cache_flush();
1072 } else
1073 err = 0;
1074 finish:
1075 kfree(new.ex_pathname);
1076 if (exp)
1077 exp_put(exp);
1078 if (fsid_key && !IS_ERR(fsid_key))
1079 cache_put(&fsid_key->h, &svc_expkey_cache);
1080 path_put(&path);
1081 out_put_clp:
1082 auth_domain_put(clp);
1083 out_unlock:
1084 exp_writeunlock();
1085 out:
1086 return err;
1087 }
1088
1089 /*
1090 * Unexport a file system. The export entry has already
1091 * been removed from the client's list of exported fs's.
1092 */
1093 static void
1094 exp_do_unexport(svc_export *unexp)
1095 {
1096 unexp->h.expiry_time = get_seconds()-1;
1097 svc_export_cache.nextcheck = get_seconds();
1098 exp_unhash(unexp);
1099 exp_fsid_unhash(unexp);
1100 }
1101
1102
1103 /*
1104 * unexport syscall.
1105 */
1106 int
1107 exp_unexport(struct nfsctl_export *nxp)
1108 {
1109 struct auth_domain *dom;
1110 svc_export *exp;
1111 struct path path;
1112 int err;
1113
1114 /* Consistency check */
1115 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1116 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1117 return -EINVAL;
1118
1119 exp_writelock();
1120
1121 err = -EINVAL;
1122 dom = auth_domain_find(nxp->ex_client);
1123 if (!dom) {
1124 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1125 goto out_unlock;
1126 }
1127
1128 err = kern_path(nxp->ex_path, 0, &path);
1129 if (err)
1130 goto out_domain;
1131
1132 err = -EINVAL;
1133 exp = exp_get_by_name(dom, path.mnt, path.dentry, NULL);
1134 path_put(&path);
1135 if (IS_ERR(exp))
1136 goto out_domain;
1137
1138 exp_do_unexport(exp);
1139 exp_put(exp);
1140 err = 0;
1141
1142 out_domain:
1143 auth_domain_put(dom);
1144 cache_flush();
1145 out_unlock:
1146 exp_writeunlock();
1147 return err;
1148 }
1149
1150 /*
1151 * Obtain the root fh on behalf of a client.
1152 * This could be done in user space, but I feel that it adds some safety
1153 * since its harder to fool a kernel module than a user space program.
1154 */
1155 int
1156 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1157 {
1158 struct svc_export *exp;
1159 struct path path;
1160 struct inode *inode;
1161 struct svc_fh fh;
1162 int err;
1163
1164 err = -EPERM;
1165 /* NB: we probably ought to check that it's NUL-terminated */
1166 if (kern_path(name, 0, &path)) {
1167 printk("nfsd: exp_rootfh path not found %s", name);
1168 return err;
1169 }
1170 inode = path.dentry->d_inode;
1171
1172 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1173 name, path.dentry, clp->name,
1174 inode->i_sb->s_id, inode->i_ino);
1175 exp = exp_parent(clp, path.mnt, path.dentry, NULL);
1176 if (IS_ERR(exp)) {
1177 err = PTR_ERR(exp);
1178 goto out;
1179 }
1180
1181 /*
1182 * fh must be initialized before calling fh_compose
1183 */
1184 fh_init(&fh, maxsize);
1185 if (fh_compose(&fh, exp, path.dentry, NULL))
1186 err = -EINVAL;
1187 else
1188 err = 0;
1189 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1190 fh_put(&fh);
1191 exp_put(exp);
1192 out:
1193 path_put(&path);
1194 return err;
1195 }
1196
1197 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1198 u32 *fsidv, struct cache_req *reqp)
1199 {
1200 struct svc_export *exp;
1201 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1202 if (IS_ERR(ek))
1203 return ERR_CAST(ek);
1204
1205 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
1206 cache_put(&ek->h, &svc_expkey_cache);
1207
1208 if (IS_ERR(exp))
1209 return ERR_CAST(exp);
1210 return exp;
1211 }
1212
1213 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1214 {
1215 struct exp_flavor_info *f;
1216 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1217
1218 /* legacy gss-only clients are always OK: */
1219 if (exp->ex_client == rqstp->rq_gssclient)
1220 return 0;
1221 /* ip-address based client; check sec= export option: */
1222 for (f = exp->ex_flavors; f < end; f++) {
1223 if (f->pseudoflavor == rqstp->rq_flavor)
1224 return 0;
1225 }
1226 /* defaults in absence of sec= options: */
1227 if (exp->ex_nflavors == 0) {
1228 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1229 rqstp->rq_flavor == RPC_AUTH_UNIX)
1230 return 0;
1231 }
1232 return nfserr_wrongsec;
1233 }
1234
1235 /*
1236 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1237 * auth_unix client) if it's available and has secinfo information;
1238 * otherwise, will try to use rq_gssclient.
1239 *
1240 * Called from functions that handle requests; functions that do work on
1241 * behalf of mountd are passed a single client name to use, and should
1242 * use exp_get_by_name() or exp_find().
1243 */
1244 struct svc_export *
1245 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1246 struct dentry *dentry)
1247 {
1248 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1249
1250 if (rqstp->rq_client == NULL)
1251 goto gss;
1252
1253 /* First try the auth_unix client: */
1254 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1255 &rqstp->rq_chandle);
1256 if (PTR_ERR(exp) == -ENOENT)
1257 goto gss;
1258 if (IS_ERR(exp))
1259 return exp;
1260 /* If it has secinfo, assume there are no gss/... clients */
1261 if (exp->ex_nflavors > 0)
1262 return exp;
1263 gss:
1264 /* Otherwise, try falling back on gss client */
1265 if (rqstp->rq_gssclient == NULL)
1266 return exp;
1267 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1268 &rqstp->rq_chandle);
1269 if (PTR_ERR(gssexp) == -ENOENT)
1270 return exp;
1271 if (!IS_ERR(exp))
1272 exp_put(exp);
1273 return gssexp;
1274 }
1275
1276 struct svc_export *
1277 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1278 {
1279 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1280
1281 if (rqstp->rq_client == NULL)
1282 goto gss;
1283
1284 /* First try the auth_unix client: */
1285 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1286 if (PTR_ERR(exp) == -ENOENT)
1287 goto gss;
1288 if (IS_ERR(exp))
1289 return exp;
1290 /* If it has secinfo, assume there are no gss/... clients */
1291 if (exp->ex_nflavors > 0)
1292 return exp;
1293 gss:
1294 /* Otherwise, try falling back on gss client */
1295 if (rqstp->rq_gssclient == NULL)
1296 return exp;
1297 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1298 &rqstp->rq_chandle);
1299 if (PTR_ERR(gssexp) == -ENOENT)
1300 return exp;
1301 if (!IS_ERR(exp))
1302 exp_put(exp);
1303 return gssexp;
1304 }
1305
1306 struct svc_export *
1307 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1308 struct dentry *dentry)
1309 {
1310 struct svc_export *exp;
1311
1312 dget(dentry);
1313 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1314
1315 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1316 struct dentry *parent;
1317
1318 parent = dget_parent(dentry);
1319 dput(dentry);
1320 dentry = parent;
1321 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1322 }
1323 dput(dentry);
1324 return exp;
1325 }
1326
1327 /*
1328 * Called when we need the filehandle for the root of the pseudofs,
1329 * for a given NFSv4 client. The root is defined to be the
1330 * export point with fsid==0
1331 */
1332 __be32
1333 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1334 {
1335 struct svc_export *exp;
1336 __be32 rv;
1337 u32 fsidv[2];
1338
1339 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1340
1341 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1342 if (IS_ERR(exp))
1343 return nfserrno(PTR_ERR(exp));
1344 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1345 if (rv)
1346 goto out;
1347 rv = check_nfsd_access(exp, rqstp);
1348 out:
1349 exp_put(exp);
1350 return rv;
1351 }
1352
1353 /* Iterator */
1354
1355 static void *e_start(struct seq_file *m, loff_t *pos)
1356 __acquires(svc_export_cache.hash_lock)
1357 {
1358 loff_t n = *pos;
1359 unsigned hash, export;
1360 struct cache_head *ch;
1361
1362 exp_readlock();
1363 read_lock(&svc_export_cache.hash_lock);
1364 if (!n--)
1365 return SEQ_START_TOKEN;
1366 hash = n >> 32;
1367 export = n & ((1LL<<32) - 1);
1368
1369
1370 for (ch=export_table[hash]; ch; ch=ch->next)
1371 if (!export--)
1372 return ch;
1373 n &= ~((1LL<<32) - 1);
1374 do {
1375 hash++;
1376 n += 1LL<<32;
1377 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1378 if (hash >= EXPORT_HASHMAX)
1379 return NULL;
1380 *pos = n+1;
1381 return export_table[hash];
1382 }
1383
1384 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1385 {
1386 struct cache_head *ch = p;
1387 int hash = (*pos >> 32);
1388
1389 if (p == SEQ_START_TOKEN)
1390 hash = 0;
1391 else if (ch->next == NULL) {
1392 hash++;
1393 *pos += 1LL<<32;
1394 } else {
1395 ++*pos;
1396 return ch->next;
1397 }
1398 *pos &= ~((1LL<<32) - 1);
1399 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1400 hash++;
1401 *pos += 1LL<<32;
1402 }
1403 if (hash >= EXPORT_HASHMAX)
1404 return NULL;
1405 ++*pos;
1406 return export_table[hash];
1407 }
1408
1409 static void e_stop(struct seq_file *m, void *p)
1410 __releases(svc_export_cache.hash_lock)
1411 {
1412 read_unlock(&svc_export_cache.hash_lock);
1413 exp_readunlock();
1414 }
1415
1416 static struct flags {
1417 int flag;
1418 char *name[2];
1419 } expflags[] = {
1420 { NFSEXP_READONLY, {"ro", "rw"}},
1421 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1422 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1423 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1424 { NFSEXP_ASYNC, {"async", "sync"}},
1425 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1426 { NFSEXP_NOHIDE, {"nohide", ""}},
1427 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1428 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1429 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1430 #ifdef MSNFS
1431 { NFSEXP_MSNFS, {"msnfs", ""}},
1432 #endif
1433 { 0, {"", ""}}
1434 };
1435
1436 static void show_expflags(struct seq_file *m, int flags, int mask)
1437 {
1438 struct flags *flg;
1439 int state, first = 0;
1440
1441 for (flg = expflags; flg->flag; flg++) {
1442 if (flg->flag & ~mask)
1443 continue;
1444 state = (flg->flag & flags) ? 0 : 1;
1445 if (*flg->name[state])
1446 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1447 }
1448 }
1449
1450 static void show_secinfo_flags(struct seq_file *m, int flags)
1451 {
1452 seq_printf(m, ",");
1453 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1454 }
1455
1456 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1457 {
1458 struct exp_flavor_info *f;
1459 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1460 int lastflags = 0, first = 0;
1461
1462 if (exp->ex_nflavors == 0)
1463 return;
1464 for (f = exp->ex_flavors; f < end; f++) {
1465 if (first || f->flags != lastflags) {
1466 if (!first)
1467 show_secinfo_flags(m, lastflags);
1468 seq_printf(m, ",sec=%d", f->pseudoflavor);
1469 lastflags = f->flags;
1470 } else {
1471 seq_printf(m, ":%d", f->pseudoflavor);
1472 }
1473 }
1474 show_secinfo_flags(m, lastflags);
1475 }
1476
1477 static void exp_flags(struct seq_file *m, int flag, int fsid,
1478 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1479 {
1480 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1481 if (flag & NFSEXP_FSID)
1482 seq_printf(m, ",fsid=%d", fsid);
1483 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1484 seq_printf(m, ",anonuid=%u", anonu);
1485 if (anong != (gid_t)-2 && anong != (0x10000-2))
1486 seq_printf(m, ",anongid=%u", anong);
1487 if (fsloc && fsloc->locations_count > 0) {
1488 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1489 int i;
1490
1491 seq_printf(m, ",%s=", loctype);
1492 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1493 seq_putc(m, '@');
1494 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1495 for (i = 1; i < fsloc->locations_count; i++) {
1496 seq_putc(m, ';');
1497 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1498 seq_putc(m, '@');
1499 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1500 }
1501 }
1502 }
1503
1504 static int e_show(struct seq_file *m, void *p)
1505 {
1506 struct cache_head *cp = p;
1507 struct svc_export *exp = container_of(cp, struct svc_export, h);
1508
1509 if (p == SEQ_START_TOKEN) {
1510 seq_puts(m, "# Version 1.1\n");
1511 seq_puts(m, "# Path Client(Flags) # IPs\n");
1512 return 0;
1513 }
1514
1515 cache_get(&exp->h);
1516 if (cache_check(&svc_export_cache, &exp->h, NULL))
1517 return 0;
1518 cache_put(&exp->h, &svc_export_cache);
1519 return svc_export_show(m, &svc_export_cache, cp);
1520 }
1521
1522 struct seq_operations nfs_exports_op = {
1523 .start = e_start,
1524 .next = e_next,
1525 .stop = e_stop,
1526 .show = e_show,
1527 };
1528
1529 /*
1530 * Add or modify a client.
1531 * Change requests may involve the list of host addresses. The list of
1532 * exports and possibly existing uid maps are left untouched.
1533 */
1534 int
1535 exp_addclient(struct nfsctl_client *ncp)
1536 {
1537 struct auth_domain *dom;
1538 int i, err;
1539 struct in6_addr addr6;
1540
1541 /* First, consistency check. */
1542 err = -EINVAL;
1543 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1544 goto out;
1545 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1546 goto out;
1547
1548 /* Lock the hashtable */
1549 exp_writelock();
1550
1551 dom = unix_domain_find(ncp->cl_ident);
1552
1553 err = -ENOMEM;
1554 if (!dom)
1555 goto out_unlock;
1556
1557 /* Insert client into hashtable. */
1558 for (i = 0; i < ncp->cl_naddr; i++) {
1559 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1560 auth_unix_add_addr(&addr6, dom);
1561 }
1562 auth_unix_forget_old(dom);
1563 auth_domain_put(dom);
1564
1565 err = 0;
1566
1567 out_unlock:
1568 exp_writeunlock();
1569 out:
1570 return err;
1571 }
1572
1573 /*
1574 * Delete a client given an identifier.
1575 */
1576 int
1577 exp_delclient(struct nfsctl_client *ncp)
1578 {
1579 int err;
1580 struct auth_domain *dom;
1581
1582 err = -EINVAL;
1583 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1584 goto out;
1585
1586 /* Lock the hashtable */
1587 exp_writelock();
1588
1589 dom = auth_domain_find(ncp->cl_ident);
1590 /* just make sure that no addresses work
1591 * and that it will expire soon
1592 */
1593 if (dom) {
1594 err = auth_unix_forget_old(dom);
1595 auth_domain_put(dom);
1596 }
1597
1598 exp_writeunlock();
1599 out:
1600 return err;
1601 }
1602
1603 /*
1604 * Verify that string is non-empty and does not exceed max length.
1605 */
1606 static int
1607 exp_verify_string(char *cp, int max)
1608 {
1609 int i;
1610
1611 for (i = 0; i < max; i++)
1612 if (!cp[i])
1613 return i;
1614 cp[i] = 0;
1615 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1616 return 0;
1617 }
1618
1619 /*
1620 * Initialize the exports module.
1621 */
1622 int
1623 nfsd_export_init(void)
1624 {
1625 int rv;
1626 dprintk("nfsd: initializing export module.\n");
1627
1628 rv = cache_register(&svc_export_cache);
1629 if (rv)
1630 return rv;
1631 rv = cache_register(&svc_expkey_cache);
1632 if (rv)
1633 cache_unregister(&svc_export_cache);
1634 return rv;
1635
1636 }
1637
1638 /*
1639 * Flush exports table - called when last nfsd thread is killed
1640 */
1641 void
1642 nfsd_export_flush(void)
1643 {
1644 exp_writelock();
1645 cache_purge(&svc_expkey_cache);
1646 cache_purge(&svc_export_cache);
1647 exp_writeunlock();
1648 }
1649
1650 /*
1651 * Shutdown the exports module.
1652 */
1653 void
1654 nfsd_export_shutdown(void)
1655 {
1656
1657 dprintk("nfsd: shutting down export module.\n");
1658
1659 exp_writelock();
1660
1661 cache_unregister(&svc_expkey_cache);
1662 cache_unregister(&svc_export_cache);
1663 svcauth_unix_purge();
1664
1665 exp_writeunlock();
1666 dprintk("nfsd: export shutdown complete.\n");
1667 }
kernel-based virtual machine