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docs: fix ManagementStyle book name
[linux-2.6/verdex.git] / fs / nfsd / export.c
blob5839b229cd0ea9bbd631441b89a07e639be0a98f
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, struct vfsmount *mnt,
851 struct dentry *dentry,
852 struct cache_req *reqp)
853 {
854 struct svc_export *exp, key;
855 int err;
856
857 if (!clp)
858 return ERR_PTR(-ENOENT);
859
860 key.ex_client = clp;
861 key.ex_path.mnt = mnt;
862 key.ex_path.dentry = dentry;
863
864 exp = svc_export_lookup(&key);
865 if (exp == NULL)
866 return ERR_PTR(-ENOMEM);
867 err = cache_check(&svc_export_cache, &exp->h, reqp);
868 if (err)
869 return ERR_PTR(err);
870 return exp;
871 }
872
873 /*
874 * Find the export entry for a given dentry.
875 */
876 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
877 struct dentry *dentry,
878 struct cache_req *reqp)
879 {
880 svc_export *exp;
881
882 dget(dentry);
883 exp = exp_get_by_name(clp, mnt, dentry, reqp);
884
885 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
886 struct dentry *parent;
887
888 parent = dget_parent(dentry);
889 dput(dentry);
890 dentry = parent;
891 exp = exp_get_by_name(clp, mnt, dentry, reqp);
892 }
893 dput(dentry);
894 return exp;
895 }
896
897 /*
898 * Hashtable locking. Write locks are placed only by user processes
899 * wanting to modify export information.
900 * Write locking only done in this file. Read locking
901 * needed externally.
902 */
903
904 static DECLARE_RWSEM(hash_sem);
905
906 void
907 exp_readlock(void)
908 {
909 down_read(&hash_sem);
910 }
911
912 static inline void
913 exp_writelock(void)
914 {
915 down_write(&hash_sem);
916 }
917
918 void
919 exp_readunlock(void)
920 {
921 up_read(&hash_sem);
922 }
923
924 static inline void
925 exp_writeunlock(void)
926 {
927 up_write(&hash_sem);
928 }
929
930 static void exp_fsid_unhash(struct svc_export *exp)
931 {
932 struct svc_expkey *ek;
933
934 if ((exp->ex_flags & NFSEXP_FSID) == 0)
935 return;
936
937 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
938 if (!IS_ERR(ek)) {
939 ek->h.expiry_time = get_seconds()-1;
940 cache_put(&ek->h, &svc_expkey_cache);
941 }
942 svc_expkey_cache.nextcheck = get_seconds();
943 }
944
945 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
946 {
947 u32 fsid[2];
948
949 if ((exp->ex_flags & NFSEXP_FSID) == 0)
950 return 0;
951
952 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
953 return exp_set_key(clp, FSID_NUM, fsid, exp);
954 }
955
956 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
957 {
958 u32 fsid[2];
959 struct inode *inode = exp->ex_path.dentry->d_inode;
960 dev_t dev = inode->i_sb->s_dev;
961
962 if (old_valid_dev(dev)) {
963 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
964 return exp_set_key(clp, FSID_DEV, fsid, exp);
965 }
966 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
967 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
968 }
969
970 static void exp_unhash(struct svc_export *exp)
971 {
972 struct svc_expkey *ek;
973 struct inode *inode = exp->ex_path.dentry->d_inode;
974
975 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
976 if (!IS_ERR(ek)) {
977 ek->h.expiry_time = get_seconds()-1;
978 cache_put(&ek->h, &svc_expkey_cache);
979 }
980 svc_expkey_cache.nextcheck = get_seconds();
981 }
982
983 /*
984 * Export a file system.
985 */
986 int
987 exp_export(struct nfsctl_export *nxp)
988 {
989 svc_client *clp;
990 struct svc_export *exp = NULL;
991 struct svc_export new;
992 struct svc_expkey *fsid_key = NULL;
993 struct path path;
994 int err;
995
996 /* Consistency check */
997 err = -EINVAL;
998 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
999 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1000 goto out;
1001
1002 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1003 nxp->ex_client, nxp->ex_path,
1004 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1005 nxp->ex_flags);
1006
1007 /* Try to lock the export table for update */
1008 exp_writelock();
1009
1010 /* Look up client info */
1011 if (!(clp = auth_domain_find(nxp->ex_client)))
1012 goto out_unlock;
1013
1014
1015 /* Look up the dentry */
1016 err = kern_path(nxp->ex_path, 0, &path);
1017 if (err)
1018 goto out_put_clp;
1019 err = -EINVAL;
1020
1021 exp = exp_get_by_name(clp, path.mnt, path.dentry, NULL);
1022
1023 memset(&new, 0, sizeof(new));
1024
1025 /* must make sure there won't be an ex_fsid clash */
1026 if ((nxp->ex_flags & NFSEXP_FSID) &&
1027 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1028 fsid_key->ek_path.mnt &&
1029 (fsid_key->ek_path.mnt != path.mnt ||
1030 fsid_key->ek_path.dentry != path.dentry))
1031 goto finish;
1032
1033 if (!IS_ERR(exp)) {
1034 /* just a flags/id/fsid update */
1035
1036 exp_fsid_unhash(exp);
1037 exp->ex_flags = nxp->ex_flags;
1038 exp->ex_anon_uid = nxp->ex_anon_uid;
1039 exp->ex_anon_gid = nxp->ex_anon_gid;
1040 exp->ex_fsid = nxp->ex_dev;
1041
1042 err = exp_fsid_hash(clp, exp);
1043 goto finish;
1044 }
1045
1046 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1047 if (err) goto finish;
1048
1049 err = -ENOMEM;
1050
1051 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1052
1053 new.h.expiry_time = NEVER;
1054 new.h.flags = 0;
1055 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1056 if (!new.ex_pathname)
1057 goto finish;
1058 new.ex_client = clp;
1059 new.ex_path = path;
1060 new.ex_flags = nxp->ex_flags;
1061 new.ex_anon_uid = nxp->ex_anon_uid;
1062 new.ex_anon_gid = nxp->ex_anon_gid;
1063 new.ex_fsid = nxp->ex_dev;
1064
1065 exp = svc_export_lookup(&new);
1066 if (exp)
1067 exp = svc_export_update(&new, exp);
1068
1069 if (!exp)
1070 goto finish;
1071
1072 if (exp_hash(clp, exp) ||
1073 exp_fsid_hash(clp, exp)) {
1074 /* failed to create at least one index */
1075 exp_do_unexport(exp);
1076 cache_flush();
1077 } else
1078 err = 0;
1079 finish:
1080 kfree(new.ex_pathname);
1081 if (exp)
1082 exp_put(exp);
1083 if (fsid_key && !IS_ERR(fsid_key))
1084 cache_put(&fsid_key->h, &svc_expkey_cache);
1085 path_put(&path);
1086 out_put_clp:
1087 auth_domain_put(clp);
1088 out_unlock:
1089 exp_writeunlock();
1090 out:
1091 return err;
1092 }
1093
1094 /*
1095 * Unexport a file system. The export entry has already
1096 * been removed from the client's list of exported fs's.
1097 */
1098 static void
1099 exp_do_unexport(svc_export *unexp)
1100 {
1101 unexp->h.expiry_time = get_seconds()-1;
1102 svc_export_cache.nextcheck = get_seconds();
1103 exp_unhash(unexp);
1104 exp_fsid_unhash(unexp);
1105 }
1106
1107
1108 /*
1109 * unexport syscall.
1110 */
1111 int
1112 exp_unexport(struct nfsctl_export *nxp)
1113 {
1114 struct auth_domain *dom;
1115 svc_export *exp;
1116 struct path path;
1117 int err;
1118
1119 /* Consistency check */
1120 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1121 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1122 return -EINVAL;
1123
1124 exp_writelock();
1125
1126 err = -EINVAL;
1127 dom = auth_domain_find(nxp->ex_client);
1128 if (!dom) {
1129 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1130 goto out_unlock;
1131 }
1132
1133 err = kern_path(nxp->ex_path, 0, &path);
1134 if (err)
1135 goto out_domain;
1136
1137 err = -EINVAL;
1138 exp = exp_get_by_name(dom, path.mnt, path.dentry, NULL);
1139 path_put(&path);
1140 if (IS_ERR(exp))
1141 goto out_domain;
1142
1143 exp_do_unexport(exp);
1144 exp_put(exp);
1145 err = 0;
1146
1147 out_domain:
1148 auth_domain_put(dom);
1149 cache_flush();
1150 out_unlock:
1151 exp_writeunlock();
1152 return err;
1153 }
1154
1155 /*
1156 * Obtain the root fh on behalf of a client.
1157 * This could be done in user space, but I feel that it adds some safety
1158 * since its harder to fool a kernel module than a user space program.
1159 */
1160 int
1161 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1162 {
1163 struct svc_export *exp;
1164 struct path path;
1165 struct inode *inode;
1166 struct svc_fh fh;
1167 int err;
1168
1169 err = -EPERM;
1170 /* NB: we probably ought to check that it's NUL-terminated */
1171 if (kern_path(name, 0, &path)) {
1172 printk("nfsd: exp_rootfh path not found %s", name);
1173 return err;
1174 }
1175 inode = path.dentry->d_inode;
1176
1177 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1178 name, path.dentry, clp->name,
1179 inode->i_sb->s_id, inode->i_ino);
1180 exp = exp_parent(clp, path.mnt, path.dentry, NULL);
1181 if (IS_ERR(exp)) {
1182 err = PTR_ERR(exp);
1183 goto out;
1184 }
1185
1186 /*
1187 * fh must be initialized before calling fh_compose
1188 */
1189 fh_init(&fh, maxsize);
1190 if (fh_compose(&fh, exp, path.dentry, NULL))
1191 err = -EINVAL;
1192 else
1193 err = 0;
1194 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1195 fh_put(&fh);
1196 exp_put(exp);
1197 out:
1198 path_put(&path);
1199 return err;
1200 }
1201
1202 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1203 u32 *fsidv, struct cache_req *reqp)
1204 {
1205 struct svc_export *exp;
1206 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1207 if (IS_ERR(ek))
1208 return ERR_CAST(ek);
1209
1210 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
1211 cache_put(&ek->h, &svc_expkey_cache);
1212
1213 if (IS_ERR(exp))
1214 return ERR_CAST(exp);
1215 return exp;
1216 }
1217
1218 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1219 {
1220 struct exp_flavor_info *f;
1221 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1222
1223 /* legacy gss-only clients are always OK: */
1224 if (exp->ex_client == rqstp->rq_gssclient)
1225 return 0;
1226 /* ip-address based client; check sec= export option: */
1227 for (f = exp->ex_flavors; f < end; f++) {
1228 if (f->pseudoflavor == rqstp->rq_flavor)
1229 return 0;
1230 }
1231 /* defaults in absence of sec= options: */
1232 if (exp->ex_nflavors == 0) {
1233 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1234 rqstp->rq_flavor == RPC_AUTH_UNIX)
1235 return 0;
1236 }
1237 return nfserr_wrongsec;
1238 }
1239
1240 /*
1241 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1242 * auth_unix client) if it's available and has secinfo information;
1243 * otherwise, will try to use rq_gssclient.
1244 *
1245 * Called from functions that handle requests; functions that do work on
1246 * behalf of mountd are passed a single client name to use, and should
1247 * use exp_get_by_name() or exp_find().
1248 */
1249 struct svc_export *
1250 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1251 struct dentry *dentry)
1252 {
1253 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1254
1255 if (rqstp->rq_client == NULL)
1256 goto gss;
1257
1258 /* First try the auth_unix client: */
1259 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1260 &rqstp->rq_chandle);
1261 if (PTR_ERR(exp) == -ENOENT)
1262 goto gss;
1263 if (IS_ERR(exp))
1264 return exp;
1265 /* If it has secinfo, assume there are no gss/... clients */
1266 if (exp->ex_nflavors > 0)
1267 return exp;
1268 gss:
1269 /* Otherwise, try falling back on gss client */
1270 if (rqstp->rq_gssclient == NULL)
1271 return exp;
1272 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1273 &rqstp->rq_chandle);
1274 if (PTR_ERR(gssexp) == -ENOENT)
1275 return exp;
1276 if (!IS_ERR(exp))
1277 exp_put(exp);
1278 return gssexp;
1279 }
1280
1281 struct svc_export *
1282 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1283 {
1284 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1285
1286 if (rqstp->rq_client == NULL)
1287 goto gss;
1288
1289 /* First try the auth_unix client: */
1290 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1291 if (PTR_ERR(exp) == -ENOENT)
1292 goto gss;
1293 if (IS_ERR(exp))
1294 return exp;
1295 /* If it has secinfo, assume there are no gss/... clients */
1296 if (exp->ex_nflavors > 0)
1297 return exp;
1298 gss:
1299 /* Otherwise, try falling back on gss client */
1300 if (rqstp->rq_gssclient == NULL)
1301 return exp;
1302 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1303 &rqstp->rq_chandle);
1304 if (PTR_ERR(gssexp) == -ENOENT)
1305 return exp;
1306 if (!IS_ERR(exp))
1307 exp_put(exp);
1308 return gssexp;
1309 }
1310
1311 struct svc_export *
1312 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1313 struct dentry *dentry)
1314 {
1315 struct svc_export *exp;
1316
1317 dget(dentry);
1318 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1319
1320 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1321 struct dentry *parent;
1322
1323 parent = dget_parent(dentry);
1324 dput(dentry);
1325 dentry = parent;
1326 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1327 }
1328 dput(dentry);
1329 return exp;
1330 }
1331
1332 /*
1333 * Called when we need the filehandle for the root of the pseudofs,
1334 * for a given NFSv4 client. The root is defined to be the
1335 * export point with fsid==0
1336 */
1337 __be32
1338 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1339 {
1340 struct svc_export *exp;
1341 __be32 rv;
1342 u32 fsidv[2];
1343
1344 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1345
1346 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1347 if (IS_ERR(exp))
1348 return nfserrno(PTR_ERR(exp));
1349 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1350 if (rv)
1351 goto out;
1352 rv = check_nfsd_access(exp, rqstp);
1353 out:
1354 exp_put(exp);
1355 return rv;
1356 }
1357
1358 /* Iterator */
1359
1360 static void *e_start(struct seq_file *m, loff_t *pos)
1361 __acquires(svc_export_cache.hash_lock)
1362 {
1363 loff_t n = *pos;
1364 unsigned hash, export;
1365 struct cache_head *ch;
1366
1367 exp_readlock();
1368 read_lock(&svc_export_cache.hash_lock);
1369 if (!n--)
1370 return SEQ_START_TOKEN;
1371 hash = n >> 32;
1372 export = n & ((1LL<<32) - 1);
1373
1374
1375 for (ch=export_table[hash]; ch; ch=ch->next)
1376 if (!export--)
1377 return ch;
1378 n &= ~((1LL<<32) - 1);
1379 do {
1380 hash++;
1381 n += 1LL<<32;
1382 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1383 if (hash >= EXPORT_HASHMAX)
1384 return NULL;
1385 *pos = n+1;
1386 return export_table[hash];
1387 }
1388
1389 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1390 {
1391 struct cache_head *ch = p;
1392 int hash = (*pos >> 32);
1393
1394 if (p == SEQ_START_TOKEN)
1395 hash = 0;
1396 else if (ch->next == NULL) {
1397 hash++;
1398 *pos += 1LL<<32;
1399 } else {
1400 ++*pos;
1401 return ch->next;
1402 }
1403 *pos &= ~((1LL<<32) - 1);
1404 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1405 hash++;
1406 *pos += 1LL<<32;
1407 }
1408 if (hash >= EXPORT_HASHMAX)
1409 return NULL;
1410 ++*pos;
1411 return export_table[hash];
1412 }
1413
1414 static void e_stop(struct seq_file *m, void *p)
1415 __releases(svc_export_cache.hash_lock)
1416 {
1417 read_unlock(&svc_export_cache.hash_lock);
1418 exp_readunlock();
1419 }
1420
1421 static struct flags {
1422 int flag;
1423 char *name[2];
1424 } expflags[] = {
1425 { NFSEXP_READONLY, {"ro", "rw"}},
1426 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1427 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1428 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1429 { NFSEXP_ASYNC, {"async", "sync"}},
1430 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1431 { NFSEXP_NOHIDE, {"nohide", ""}},
1432 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1433 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1434 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1435 #ifdef MSNFS
1436 { NFSEXP_MSNFS, {"msnfs", ""}},
1437 #endif
1438 { 0, {"", ""}}
1439 };
1440
1441 static void show_expflags(struct seq_file *m, int flags, int mask)
1442 {
1443 struct flags *flg;
1444 int state, first = 0;
1445
1446 for (flg = expflags; flg->flag; flg++) {
1447 if (flg->flag & ~mask)
1448 continue;
1449 state = (flg->flag & flags) ? 0 : 1;
1450 if (*flg->name[state])
1451 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1452 }
1453 }
1454
1455 static void show_secinfo_flags(struct seq_file *m, int flags)
1456 {
1457 seq_printf(m, ",");
1458 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1459 }
1460
1461 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1462 {
1463 struct exp_flavor_info *f;
1464 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1465 int lastflags = 0, first = 0;
1466
1467 if (exp->ex_nflavors == 0)
1468 return;
1469 for (f = exp->ex_flavors; f < end; f++) {
1470 if (first || f->flags != lastflags) {
1471 if (!first)
1472 show_secinfo_flags(m, lastflags);
1473 seq_printf(m, ",sec=%d", f->pseudoflavor);
1474 lastflags = f->flags;
1475 } else {
1476 seq_printf(m, ":%d", f->pseudoflavor);
1477 }
1478 }
1479 show_secinfo_flags(m, lastflags);
1480 }
1481
1482 static void exp_flags(struct seq_file *m, int flag, int fsid,
1483 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1484 {
1485 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1486 if (flag & NFSEXP_FSID)
1487 seq_printf(m, ",fsid=%d", fsid);
1488 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1489 seq_printf(m, ",anonuid=%u", anonu);
1490 if (anong != (gid_t)-2 && anong != (0x10000-2))
1491 seq_printf(m, ",anongid=%u", anong);
1492 if (fsloc && fsloc->locations_count > 0) {
1493 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1494 int i;
1495
1496 seq_printf(m, ",%s=", loctype);
1497 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1498 seq_putc(m, '@');
1499 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1500 for (i = 1; i < fsloc->locations_count; i++) {
1501 seq_putc(m, ';');
1502 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1503 seq_putc(m, '@');
1504 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1505 }
1506 }
1507 }
1508
1509 static int e_show(struct seq_file *m, void *p)
1510 {
1511 struct cache_head *cp = p;
1512 struct svc_export *exp = container_of(cp, struct svc_export, h);
1513
1514 if (p == SEQ_START_TOKEN) {
1515 seq_puts(m, "# Version 1.1\n");
1516 seq_puts(m, "# Path Client(Flags) # IPs\n");
1517 return 0;
1518 }
1519
1520 cache_get(&exp->h);
1521 if (cache_check(&svc_export_cache, &exp->h, NULL))
1522 return 0;
1523 cache_put(&exp->h, &svc_export_cache);
1524 return svc_export_show(m, &svc_export_cache, cp);
1525 }
1526
1527 struct seq_operations nfs_exports_op = {
1528 .start = e_start,
1529 .next = e_next,
1530 .stop = e_stop,
1531 .show = e_show,
1532 };
1533
1534 /*
1535 * Add or modify a client.
1536 * Change requests may involve the list of host addresses. The list of
1537 * exports and possibly existing uid maps are left untouched.
1538 */
1539 int
1540 exp_addclient(struct nfsctl_client *ncp)
1541 {
1542 struct auth_domain *dom;
1543 int i, err;
1544 struct in6_addr addr6;
1545
1546 /* First, consistency check. */
1547 err = -EINVAL;
1548 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1549 goto out;
1550 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1551 goto out;
1552
1553 /* Lock the hashtable */
1554 exp_writelock();
1555
1556 dom = unix_domain_find(ncp->cl_ident);
1557
1558 err = -ENOMEM;
1559 if (!dom)
1560 goto out_unlock;
1561
1562 /* Insert client into hashtable. */
1563 for (i = 0; i < ncp->cl_naddr; i++) {
1564 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1565 auth_unix_add_addr(&addr6, dom);
1566 }
1567 auth_unix_forget_old(dom);
1568 auth_domain_put(dom);
1569
1570 err = 0;
1571
1572 out_unlock:
1573 exp_writeunlock();
1574 out:
1575 return err;
1576 }
1577
1578 /*
1579 * Delete a client given an identifier.
1580 */
1581 int
1582 exp_delclient(struct nfsctl_client *ncp)
1583 {
1584 int err;
1585 struct auth_domain *dom;
1586
1587 err = -EINVAL;
1588 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1589 goto out;
1590
1591 /* Lock the hashtable */
1592 exp_writelock();
1593
1594 dom = auth_domain_find(ncp->cl_ident);
1595 /* just make sure that no addresses work
1596 * and that it will expire soon
1597 */
1598 if (dom) {
1599 err = auth_unix_forget_old(dom);
1600 auth_domain_put(dom);
1601 }
1602
1603 exp_writeunlock();
1604 out:
1605 return err;
1606 }
1607
1608 /*
1609 * Verify that string is non-empty and does not exceed max length.
1610 */
1611 static int
1612 exp_verify_string(char *cp, int max)
1613 {
1614 int i;
1615
1616 for (i = 0; i < max; i++)
1617 if (!cp[i])
1618 return i;
1619 cp[i] = 0;
1620 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1621 return 0;
1622 }
1623
1624 /*
1625 * Initialize the exports module.
1626 */
1627 int
1628 nfsd_export_init(void)
1629 {
1630 int rv;
1631 dprintk("nfsd: initializing export module.\n");
1632
1633 rv = cache_register(&svc_export_cache);
1634 if (rv)
1635 return rv;
1636 rv = cache_register(&svc_expkey_cache);
1637 if (rv)
1638 cache_unregister(&svc_export_cache);
1639 return rv;
1640
1641 }
1642
1643 /*
1644 * Flush exports table - called when last nfsd thread is killed
1645 */
1646 void
1647 nfsd_export_flush(void)
1648 {
1649 exp_writelock();
1650 cache_purge(&svc_expkey_cache);
1651 cache_purge(&svc_export_cache);
1652 exp_writeunlock();
1653 }
1654
1655 /*
1656 * Shutdown the exports module.
1657 */
1658 void
1659 nfsd_export_shutdown(void)
1660 {
1661
1662 dprintk("nfsd: shutting down export module.\n");
1663
1664 exp_writelock();
1665
1666 cache_unregister(&svc_expkey_cache);
1667 cache_unregister(&svc_export_cache);
1668 svcauth_unix_purge();
1669
1670 exp_writeunlock();
1671 dprintk("nfsd: export shutdown complete.\n");
1672 }
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