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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / fs / nfsd / export.c
blobc1c9e035d4a4777e483872ed82ae4b68056c49b1
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 int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
89 {
90 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
91 }
92
93 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
94 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
95 static struct cache_detail svc_expkey_cache;
96
97 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
98 {
99 /* client fsidtype fsid [path] */
100 char *buf;
101 int len;
102 struct auth_domain *dom = NULL;
103 int err;
104 int fsidtype;
105 char *ep;
106 struct svc_expkey key;
107 struct svc_expkey *ek = NULL;
108
109 if (mesg[mlen-1] != '\n')
110 return -EINVAL;
111 mesg[mlen-1] = 0;
112
113 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
114 err = -ENOMEM;
115 if (!buf)
116 goto out;
117
118 err = -EINVAL;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121
122 err = -ENOENT;
123 dom = auth_domain_find(buf);
124 if (!dom)
125 goto out;
126 dprintk("found domain %s\n", buf);
127
128 err = -EINVAL;
129 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
130 goto out;
131 fsidtype = simple_strtoul(buf, &ep, 10);
132 if (*ep)
133 goto out;
134 dprintk("found fsidtype %d\n", fsidtype);
135 if (key_len(fsidtype)==0) /* invalid type */
136 goto out;
137 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
138 goto out;
139 dprintk("found fsid length %d\n", len);
140 if (len != key_len(fsidtype))
141 goto out;
142
143 /* OK, we seem to have a valid key */
144 key.h.flags = 0;
145 key.h.expiry_time = get_expiry(&mesg);
146 if (key.h.expiry_time == 0)
147 goto out;
148
149 key.ek_client = dom;
150 key.ek_fsidtype = fsidtype;
151 memcpy(key.ek_fsid, buf, len);
152
153 ek = svc_expkey_lookup(&key);
154 err = -ENOMEM;
155 if (!ek)
156 goto out;
157
158 /* now we want a pathname, or empty meaning NEGATIVE */
159 err = -EINVAL;
160 len = qword_get(&mesg, buf, PAGE_SIZE);
161 if (len < 0)
162 goto out;
163 dprintk("Path seems to be <%s>\n", buf);
164 err = 0;
165 if (len == 0) {
166 set_bit(CACHE_NEGATIVE, &key.h.flags);
167 ek = svc_expkey_update(&key, ek);
168 if (!ek)
169 err = -ENOMEM;
170 } else {
171 err = kern_path(buf, 0, &key.ek_path);
172 if (err)
173 goto out;
174
175 dprintk("Found the path %s\n", buf);
176
177 ek = svc_expkey_update(&key, ek);
178 if (!ek)
179 err = -ENOMEM;
180 path_put(&key.ek_path);
181 }
182 cache_flush();
183 out:
184 if (ek)
185 cache_put(&ek->h, &svc_expkey_cache);
186 if (dom)
187 auth_domain_put(dom);
188 kfree(buf);
189 return err;
190 }
191
192 static int expkey_show(struct seq_file *m,
193 struct cache_detail *cd,
194 struct cache_head *h)
195 {
196 struct svc_expkey *ek ;
197 int i;
198
199 if (h ==NULL) {
200 seq_puts(m, "#domain fsidtype fsid [path]\n");
201 return 0;
202 }
203 ek = container_of(h, struct svc_expkey, h);
204 seq_printf(m, "%s %d 0x", ek->ek_client->name,
205 ek->ek_fsidtype);
206 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
207 seq_printf(m, "%08x", ek->ek_fsid[i]);
208 if (test_bit(CACHE_VALID, &h->flags) &&
209 !test_bit(CACHE_NEGATIVE, &h->flags)) {
210 seq_printf(m, " ");
211 seq_path(m, &ek->ek_path, "\\ \t\n");
212 }
213 seq_printf(m, "\n");
214 return 0;
215 }
216
217 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
218 {
219 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
220 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
221
222 if (orig->ek_fsidtype != new->ek_fsidtype ||
223 orig->ek_client != new->ek_client ||
224 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
225 return 0;
226 return 1;
227 }
228
229 static inline void expkey_init(struct cache_head *cnew,
230 struct cache_head *citem)
231 {
232 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
233 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
234
235 kref_get(&item->ek_client->ref);
236 new->ek_client = item->ek_client;
237 new->ek_fsidtype = item->ek_fsidtype;
238
239 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
240 }
241
242 static inline void expkey_update(struct cache_head *cnew,
243 struct cache_head *citem)
244 {
245 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
246 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
247
248 new->ek_path = item->ek_path;
249 path_get(&item->ek_path);
250 }
251
252 static struct cache_head *expkey_alloc(void)
253 {
254 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
255 if (i)
256 return &i->h;
257 else
258 return NULL;
259 }
260
261 static struct cache_detail svc_expkey_cache = {
262 .owner = THIS_MODULE,
263 .hash_size = EXPKEY_HASHMAX,
264 .hash_table = expkey_table,
265 .name = "nfsd.fh",
266 .cache_put = expkey_put,
267 .cache_upcall = expkey_upcall,
268 .cache_parse = expkey_parse,
269 .cache_show = expkey_show,
270 .match = expkey_match,
271 .init = expkey_init,
272 .update = expkey_update,
273 .alloc = expkey_alloc,
274 };
275
276 static struct svc_expkey *
277 svc_expkey_lookup(struct svc_expkey *item)
278 {
279 struct cache_head *ch;
280 int hash = item->ek_fsidtype;
281 char * cp = (char*)item->ek_fsid;
282 int len = key_len(item->ek_fsidtype);
283
284 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
285 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
286 hash &= EXPKEY_HASHMASK;
287
288 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
289 hash);
290 if (ch)
291 return container_of(ch, struct svc_expkey, h);
292 else
293 return NULL;
294 }
295
296 static struct svc_expkey *
297 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
298 {
299 struct cache_head *ch;
300 int hash = new->ek_fsidtype;
301 char * cp = (char*)new->ek_fsid;
302 int len = key_len(new->ek_fsidtype);
303
304 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
305 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
306 hash &= EXPKEY_HASHMASK;
307
308 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
309 &old->h, hash);
310 if (ch)
311 return container_of(ch, struct svc_expkey, h);
312 else
313 return NULL;
314 }
315
316
317 #define EXPORT_HASHBITS 8
318 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
319 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
320
321 static struct cache_head *export_table[EXPORT_HASHMAX];
322
323 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
324 {
325 int i;
326
327 for (i = 0; i < fsloc->locations_count; i++) {
328 kfree(fsloc->locations[i].path);
329 kfree(fsloc->locations[i].hosts);
330 }
331 kfree(fsloc->locations);
332 }
333
334 static void svc_export_put(struct kref *ref)
335 {
336 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
337 path_put(&exp->ex_path);
338 auth_domain_put(exp->ex_client);
339 kfree(exp->ex_pathname);
340 nfsd4_fslocs_free(&exp->ex_fslocs);
341 kfree(exp);
342 }
343
344 static void svc_export_request(struct cache_detail *cd,
345 struct cache_head *h,
346 char **bpp, int *blen)
347 {
348 /* client path */
349 struct svc_export *exp = container_of(h, struct svc_export, h);
350 char *pth;
351
352 qword_add(bpp, blen, exp->ex_client->name);
353 pth = d_path(&exp->ex_path, *bpp, *blen);
354 if (IS_ERR(pth)) {
355 /* is this correct? */
356 (*bpp)[0] = '\n';
357 return;
358 }
359 qword_add(bpp, blen, pth);
360 (*bpp)[-1] = '\n';
361 }
362
363 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
364 {
365 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
366 }
367
368 static struct svc_export *svc_export_update(struct svc_export *new,
369 struct svc_export *old);
370 static struct svc_export *svc_export_lookup(struct svc_export *);
371
372 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
373 {
374
375 /* We currently export only dirs and regular files.
376 * This is what umountd does.
377 */
378 if (!S_ISDIR(inode->i_mode) &&
379 !S_ISREG(inode->i_mode))
380 return -ENOTDIR;
381
382 /* There are two requirements on a filesystem to be exportable.
383 * 1: We must be able to identify the filesystem from a number.
384 * either a device number (so FS_REQUIRES_DEV needed)
385 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
386 * 2: We must be able to find an inode from a filehandle.
387 * This means that s_export_op must be set.
388 */
389 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
390 !(flags & NFSEXP_FSID) &&
391 uuid == NULL) {
392 dprintk("exp_export: export of non-dev fs without fsid\n");
393 return -EINVAL;
394 }
395
396 if (!inode->i_sb->s_export_op ||
397 !inode->i_sb->s_export_op->fh_to_dentry) {
398 dprintk("exp_export: export of invalid fs type.\n");
399 return -EINVAL;
400 }
401
402 return 0;
403
404 }
405
406 #ifdef CONFIG_NFSD_V4
407
408 static int
409 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
410 {
411 int len;
412 int migrated, i, err;
413
414 /* listsize */
415 err = get_int(mesg, &fsloc->locations_count);
416 if (err)
417 return err;
418 if (fsloc->locations_count > MAX_FS_LOCATIONS)
419 return -EINVAL;
420 if (fsloc->locations_count == 0)
421 return 0;
422
423 fsloc->locations = kzalloc(fsloc->locations_count
424 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
425 if (!fsloc->locations)
426 return -ENOMEM;
427 for (i=0; i < fsloc->locations_count; i++) {
428 /* colon separated host list */
429 err = -EINVAL;
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].hosts)
436 goto out_free_all;
437 err = -EINVAL;
438 /* slash separated path component list */
439 len = qword_get(mesg, buf, PAGE_SIZE);
440 if (len <= 0)
441 goto out_free_all;
442 err = -ENOMEM;
443 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
444 if (!fsloc->locations[i].path)
445 goto out_free_all;
446 }
447 /* migrated */
448 err = get_int(mesg, &migrated);
449 if (err)
450 goto out_free_all;
451 err = -EINVAL;
452 if (migrated < 0 || migrated > 1)
453 goto out_free_all;
454 fsloc->migrated = migrated;
455 return 0;
456 out_free_all:
457 nfsd4_fslocs_free(fsloc);
458 return err;
459 }
460
461 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
462 {
463 int listsize, err;
464 struct exp_flavor_info *f;
465
466 err = get_int(mesg, &listsize);
467 if (err)
468 return err;
469 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
470 return -EINVAL;
471
472 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
473 err = get_int(mesg, &f->pseudoflavor);
474 if (err)
475 return err;
476 /*
477 * XXX: It would be nice to also check whether this
478 * pseudoflavor is supported, so we can discover the
479 * problem at export time instead of when a client fails
480 * to authenticate.
481 */
482 err = get_int(mesg, &f->flags);
483 if (err)
484 return err;
485 /* Only some flags are allowed to differ between flavors: */
486 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
487 return -EINVAL;
488 }
489 exp->ex_nflavors = listsize;
490 return 0;
491 }
492
493 #else /* CONFIG_NFSD_V4 */
494 static inline int
495 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
496 static inline int
497 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
498 #endif
499
500 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
501 {
502 /* client path expiry [flags anonuid anongid fsid] */
503 char *buf;
504 int len;
505 int err;
506 struct auth_domain *dom = NULL;
507 struct svc_export exp = {}, *expp;
508 int an_int;
509
510 if (mesg[mlen-1] != '\n')
511 return -EINVAL;
512 mesg[mlen-1] = 0;
513
514 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
515 if (!buf)
516 return -ENOMEM;
517
518 /* client */
519 err = -EINVAL;
520 len = qword_get(&mesg, buf, PAGE_SIZE);
521 if (len <= 0)
522 goto out;
523
524 err = -ENOENT;
525 dom = auth_domain_find(buf);
526 if (!dom)
527 goto out;
528
529 /* path */
530 err = -EINVAL;
531 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
532 goto out1;
533
534 err = kern_path(buf, 0, &exp.ex_path);
535 if (err)
536 goto out1;
537
538 exp.ex_client = dom;
539
540 err = -ENOMEM;
541 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
542 if (!exp.ex_pathname)
543 goto out2;
544
545 /* expiry */
546 err = -EINVAL;
547 exp.h.expiry_time = get_expiry(&mesg);
548 if (exp.h.expiry_time == 0)
549 goto out3;
550
551 /* flags */
552 err = get_int(&mesg, &an_int);
553 if (err == -ENOENT) {
554 err = 0;
555 set_bit(CACHE_NEGATIVE, &exp.h.flags);
556 } else {
557 if (err || an_int < 0)
558 goto out3;
559 exp.ex_flags= an_int;
560
561 /* anon uid */
562 err = get_int(&mesg, &an_int);
563 if (err)
564 goto out3;
565 exp.ex_anon_uid= an_int;
566
567 /* anon gid */
568 err = get_int(&mesg, &an_int);
569 if (err)
570 goto out3;
571 exp.ex_anon_gid= an_int;
572
573 /* fsid */
574 err = get_int(&mesg, &an_int);
575 if (err)
576 goto out3;
577 exp.ex_fsid = an_int;
578
579 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
580 if (strcmp(buf, "fsloc") == 0)
581 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
582 else if (strcmp(buf, "uuid") == 0) {
583 /* expect a 16 byte uuid encoded as \xXXXX... */
584 len = qword_get(&mesg, buf, PAGE_SIZE);
585 if (len != 16)
586 err = -EINVAL;
587 else {
588 exp.ex_uuid =
589 kmemdup(buf, 16, GFP_KERNEL);
590 if (exp.ex_uuid == NULL)
591 err = -ENOMEM;
592 }
593 } else if (strcmp(buf, "secinfo") == 0)
594 err = secinfo_parse(&mesg, buf, &exp);
595 else
596 /* quietly ignore unknown words and anything
597 * following. Newer user-space can try to set
598 * new values, then see what the result was.
599 */
600 break;
601 if (err)
602 goto out4;
603 }
604
605 err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
606 exp.ex_uuid);
607 if (err)
608 goto out4;
609 }
610
611 expp = svc_export_lookup(&exp);
612 if (expp)
613 expp = svc_export_update(&exp, expp);
614 else
615 err = -ENOMEM;
616 cache_flush();
617 if (expp == NULL)
618 err = -ENOMEM;
619 else
620 exp_put(expp);
621 out4:
622 nfsd4_fslocs_free(&exp.ex_fslocs);
623 kfree(exp.ex_uuid);
624 out3:
625 kfree(exp.ex_pathname);
626 out2:
627 path_put(&exp.ex_path);
628 out1:
629 auth_domain_put(dom);
630 out:
631 kfree(buf);
632 return err;
633 }
634
635 static void exp_flags(struct seq_file *m, int flag, int fsid,
636 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
637 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
638
639 static int svc_export_show(struct seq_file *m,
640 struct cache_detail *cd,
641 struct cache_head *h)
642 {
643 struct svc_export *exp ;
644
645 if (h ==NULL) {
646 seq_puts(m, "#path domain(flags)\n");
647 return 0;
648 }
649 exp = container_of(h, struct svc_export, h);
650 seq_path(m, &exp->ex_path, " \t\n\\");
651 seq_putc(m, '\t');
652 seq_escape(m, exp->ex_client->name, " \t\n\\");
653 seq_putc(m, '(');
654 if (test_bit(CACHE_VALID, &h->flags) &&
655 !test_bit(CACHE_NEGATIVE, &h->flags)) {
656 exp_flags(m, exp->ex_flags, exp->ex_fsid,
657 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
658 if (exp->ex_uuid) {
659 int i;
660 seq_puts(m, ",uuid=");
661 for (i=0; i<16; i++) {
662 if ((i&3) == 0 && i)
663 seq_putc(m, ':');
664 seq_printf(m, "%02x", exp->ex_uuid[i]);
665 }
666 }
667 show_secinfo(m, exp);
668 }
669 seq_puts(m, ")\n");
670 return 0;
671 }
672 static int svc_export_match(struct cache_head *a, struct cache_head *b)
673 {
674 struct svc_export *orig = container_of(a, struct svc_export, h);
675 struct svc_export *new = container_of(b, struct svc_export, h);
676 return orig->ex_client == new->ex_client &&
677 orig->ex_path.dentry == new->ex_path.dentry &&
678 orig->ex_path.mnt == new->ex_path.mnt;
679 }
680
681 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
682 {
683 struct svc_export *new = container_of(cnew, struct svc_export, h);
684 struct svc_export *item = container_of(citem, struct svc_export, h);
685
686 kref_get(&item->ex_client->ref);
687 new->ex_client = item->ex_client;
688 new->ex_path.dentry = dget(item->ex_path.dentry);
689 new->ex_path.mnt = mntget(item->ex_path.mnt);
690 new->ex_pathname = NULL;
691 new->ex_fslocs.locations = NULL;
692 new->ex_fslocs.locations_count = 0;
693 new->ex_fslocs.migrated = 0;
694 }
695
696 static void export_update(struct cache_head *cnew, struct cache_head *citem)
697 {
698 struct svc_export *new = container_of(cnew, struct svc_export, h);
699 struct svc_export *item = container_of(citem, struct svc_export, h);
700 int i;
701
702 new->ex_flags = item->ex_flags;
703 new->ex_anon_uid = item->ex_anon_uid;
704 new->ex_anon_gid = item->ex_anon_gid;
705 new->ex_fsid = item->ex_fsid;
706 new->ex_uuid = item->ex_uuid;
707 item->ex_uuid = NULL;
708 new->ex_pathname = item->ex_pathname;
709 item->ex_pathname = NULL;
710 new->ex_fslocs.locations = item->ex_fslocs.locations;
711 item->ex_fslocs.locations = NULL;
712 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
713 item->ex_fslocs.locations_count = 0;
714 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
715 item->ex_fslocs.migrated = 0;
716 new->ex_nflavors = item->ex_nflavors;
717 for (i = 0; i < MAX_SECINFO_LIST; i++) {
718 new->ex_flavors[i] = item->ex_flavors[i];
719 }
720 }
721
722 static struct cache_head *svc_export_alloc(void)
723 {
724 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
725 if (i)
726 return &i->h;
727 else
728 return NULL;
729 }
730
731 struct cache_detail svc_export_cache = {
732 .owner = THIS_MODULE,
733 .hash_size = EXPORT_HASHMAX,
734 .hash_table = export_table,
735 .name = "nfsd.export",
736 .cache_put = svc_export_put,
737 .cache_upcall = svc_export_upcall,
738 .cache_parse = svc_export_parse,
739 .cache_show = svc_export_show,
740 .match = svc_export_match,
741 .init = svc_export_init,
742 .update = export_update,
743 .alloc = svc_export_alloc,
744 };
745
746 static struct svc_export *
747 svc_export_lookup(struct svc_export *exp)
748 {
749 struct cache_head *ch;
750 int hash;
751 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
752 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
753 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
754
755 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
756 hash);
757 if (ch)
758 return container_of(ch, struct svc_export, h);
759 else
760 return NULL;
761 }
762
763 static struct svc_export *
764 svc_export_update(struct svc_export *new, struct svc_export *old)
765 {
766 struct cache_head *ch;
767 int hash;
768 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
769 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
770 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
771
772 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
773 &old->h,
774 hash);
775 if (ch)
776 return container_of(ch, struct svc_export, h);
777 else
778 return NULL;
779 }
780
781
782 static struct svc_expkey *
783 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
784 {
785 struct svc_expkey key, *ek;
786 int err;
787
788 if (!clp)
789 return ERR_PTR(-ENOENT);
790
791 key.ek_client = clp;
792 key.ek_fsidtype = fsid_type;
793 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
794
795 ek = svc_expkey_lookup(&key);
796 if (ek == NULL)
797 return ERR_PTR(-ENOMEM);
798 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
799 if (err)
800 return ERR_PTR(err);
801 return ek;
802 }
803
804 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
805 struct svc_export *exp)
806 {
807 struct svc_expkey key, *ek;
808
809 key.ek_client = clp;
810 key.ek_fsidtype = fsid_type;
811 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
812 key.ek_path = exp->ex_path;
813 key.h.expiry_time = NEVER;
814 key.h.flags = 0;
815
816 ek = svc_expkey_lookup(&key);
817 if (ek)
818 ek = svc_expkey_update(&key,ek);
819 if (ek) {
820 cache_put(&ek->h, &svc_expkey_cache);
821 return 0;
822 }
823 return -ENOMEM;
824 }
825
826 /*
827 * Find the client's export entry matching xdev/xino.
828 */
829 static inline struct svc_expkey *
830 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
831 {
832 u32 fsidv[3];
833
834 if (old_valid_dev(dev)) {
835 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
836 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
837 }
838 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
839 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
840 }
841
842 /*
843 * Find the client's export entry matching fsid
844 */
845 static inline struct svc_expkey *
846 exp_get_fsid_key(svc_client *clp, int fsid)
847 {
848 u32 fsidv[2];
849
850 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
851
852 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
853 }
854
855 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
856 struct cache_req *reqp)
857 {
858 struct svc_export *exp, key;
859 int err;
860
861 if (!clp)
862 return ERR_PTR(-ENOENT);
863
864 key.ex_client = clp;
865 key.ex_path = *path;
866
867 exp = svc_export_lookup(&key);
868 if (exp == NULL)
869 return ERR_PTR(-ENOMEM);
870 err = cache_check(&svc_export_cache, &exp->h, reqp);
871 if (err)
872 return ERR_PTR(err);
873 return exp;
874 }
875
876 /*
877 * Find the export entry for a given dentry.
878 */
879 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
880 {
881 struct dentry *saved = dget(path->dentry);
882 svc_export *exp = exp_get_by_name(clp, path, NULL);
883
884 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
885 struct dentry *parent = dget_parent(path->dentry);
886 dput(path->dentry);
887 path->dentry = parent;
888 exp = exp_get_by_name(clp, path, NULL);
889 }
890 dput(path->dentry);
891 path->dentry = saved;
892 return exp;
893 }
894
895 /*
896 * Hashtable locking. Write locks are placed only by user processes
897 * wanting to modify export information.
898 * Write locking only done in this file. Read locking
899 * needed externally.
900 */
901
902 static DECLARE_RWSEM(hash_sem);
903
904 void
905 exp_readlock(void)
906 {
907 down_read(&hash_sem);
908 }
909
910 static inline void
911 exp_writelock(void)
912 {
913 down_write(&hash_sem);
914 }
915
916 void
917 exp_readunlock(void)
918 {
919 up_read(&hash_sem);
920 }
921
922 static inline void
923 exp_writeunlock(void)
924 {
925 up_write(&hash_sem);
926 }
927
928 static void exp_fsid_unhash(struct svc_export *exp)
929 {
930 struct svc_expkey *ek;
931
932 if ((exp->ex_flags & NFSEXP_FSID) == 0)
933 return;
934
935 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
936 if (!IS_ERR(ek)) {
937 ek->h.expiry_time = get_seconds()-1;
938 cache_put(&ek->h, &svc_expkey_cache);
939 }
940 svc_expkey_cache.nextcheck = get_seconds();
941 }
942
943 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
944 {
945 u32 fsid[2];
946
947 if ((exp->ex_flags & NFSEXP_FSID) == 0)
948 return 0;
949
950 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
951 return exp_set_key(clp, FSID_NUM, fsid, exp);
952 }
953
954 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
955 {
956 u32 fsid[2];
957 struct inode *inode = exp->ex_path.dentry->d_inode;
958 dev_t dev = inode->i_sb->s_dev;
959
960 if (old_valid_dev(dev)) {
961 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
962 return exp_set_key(clp, FSID_DEV, fsid, exp);
963 }
964 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
965 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
966 }
967
968 static void exp_unhash(struct svc_export *exp)
969 {
970 struct svc_expkey *ek;
971 struct inode *inode = exp->ex_path.dentry->d_inode;
972
973 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
974 if (!IS_ERR(ek)) {
975 ek->h.expiry_time = get_seconds()-1;
976 cache_put(&ek->h, &svc_expkey_cache);
977 }
978 svc_expkey_cache.nextcheck = get_seconds();
979 }
980
981 /*
982 * Export a file system.
983 */
984 int
985 exp_export(struct nfsctl_export *nxp)
986 {
987 svc_client *clp;
988 struct svc_export *exp = NULL;
989 struct svc_export new;
990 struct svc_expkey *fsid_key = NULL;
991 struct path path;
992 int err;
993
994 /* Consistency check */
995 err = -EINVAL;
996 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
997 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
998 goto out;
999
1000 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1001 nxp->ex_client, nxp->ex_path,
1002 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1003 nxp->ex_flags);
1004
1005 /* Try to lock the export table for update */
1006 exp_writelock();
1007
1008 /* Look up client info */
1009 if (!(clp = auth_domain_find(nxp->ex_client)))
1010 goto out_unlock;
1011
1012
1013 /* Look up the dentry */
1014 err = kern_path(nxp->ex_path, 0, &path);
1015 if (err)
1016 goto out_put_clp;
1017 err = -EINVAL;
1018
1019 exp = exp_get_by_name(clp, &path, NULL);
1020
1021 memset(&new, 0, sizeof(new));
1022
1023 /* must make sure there won't be an ex_fsid clash */
1024 if ((nxp->ex_flags & NFSEXP_FSID) &&
1025 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1026 fsid_key->ek_path.mnt &&
1027 (fsid_key->ek_path.mnt != path.mnt ||
1028 fsid_key->ek_path.dentry != path.dentry))
1029 goto finish;
1030
1031 if (!IS_ERR(exp)) {
1032 /* just a flags/id/fsid update */
1033
1034 exp_fsid_unhash(exp);
1035 exp->ex_flags = nxp->ex_flags;
1036 exp->ex_anon_uid = nxp->ex_anon_uid;
1037 exp->ex_anon_gid = nxp->ex_anon_gid;
1038 exp->ex_fsid = nxp->ex_dev;
1039
1040 err = exp_fsid_hash(clp, exp);
1041 goto finish;
1042 }
1043
1044 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1045 if (err) goto finish;
1046
1047 err = -ENOMEM;
1048
1049 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1050
1051 new.h.expiry_time = NEVER;
1052 new.h.flags = 0;
1053 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1054 if (!new.ex_pathname)
1055 goto finish;
1056 new.ex_client = clp;
1057 new.ex_path = path;
1058 new.ex_flags = nxp->ex_flags;
1059 new.ex_anon_uid = nxp->ex_anon_uid;
1060 new.ex_anon_gid = nxp->ex_anon_gid;
1061 new.ex_fsid = nxp->ex_dev;
1062
1063 exp = svc_export_lookup(&new);
1064 if (exp)
1065 exp = svc_export_update(&new, exp);
1066
1067 if (!exp)
1068 goto finish;
1069
1070 if (exp_hash(clp, exp) ||
1071 exp_fsid_hash(clp, exp)) {
1072 /* failed to create at least one index */
1073 exp_do_unexport(exp);
1074 cache_flush();
1075 } else
1076 err = 0;
1077 finish:
1078 kfree(new.ex_pathname);
1079 if (exp)
1080 exp_put(exp);
1081 if (fsid_key && !IS_ERR(fsid_key))
1082 cache_put(&fsid_key->h, &svc_expkey_cache);
1083 path_put(&path);
1084 out_put_clp:
1085 auth_domain_put(clp);
1086 out_unlock:
1087 exp_writeunlock();
1088 out:
1089 return err;
1090 }
1091
1092 /*
1093 * Unexport a file system. The export entry has already
1094 * been removed from the client's list of exported fs's.
1095 */
1096 static void
1097 exp_do_unexport(svc_export *unexp)
1098 {
1099 unexp->h.expiry_time = get_seconds()-1;
1100 svc_export_cache.nextcheck = get_seconds();
1101 exp_unhash(unexp);
1102 exp_fsid_unhash(unexp);
1103 }
1104
1105
1106 /*
1107 * unexport syscall.
1108 */
1109 int
1110 exp_unexport(struct nfsctl_export *nxp)
1111 {
1112 struct auth_domain *dom;
1113 svc_export *exp;
1114 struct path path;
1115 int err;
1116
1117 /* Consistency check */
1118 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1119 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1120 return -EINVAL;
1121
1122 exp_writelock();
1123
1124 err = -EINVAL;
1125 dom = auth_domain_find(nxp->ex_client);
1126 if (!dom) {
1127 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1128 goto out_unlock;
1129 }
1130
1131 err = kern_path(nxp->ex_path, 0, &path);
1132 if (err)
1133 goto out_domain;
1134
1135 err = -EINVAL;
1136 exp = exp_get_by_name(dom, &path, NULL);
1137 path_put(&path);
1138 if (IS_ERR(exp))
1139 goto out_domain;
1140
1141 exp_do_unexport(exp);
1142 exp_put(exp);
1143 err = 0;
1144
1145 out_domain:
1146 auth_domain_put(dom);
1147 cache_flush();
1148 out_unlock:
1149 exp_writeunlock();
1150 return err;
1151 }
1152
1153 /*
1154 * Obtain the root fh on behalf of a client.
1155 * This could be done in user space, but I feel that it adds some safety
1156 * since its harder to fool a kernel module than a user space program.
1157 */
1158 int
1159 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1160 {
1161 struct svc_export *exp;
1162 struct path path;
1163 struct inode *inode;
1164 struct svc_fh fh;
1165 int err;
1166
1167 err = -EPERM;
1168 /* NB: we probably ought to check that it's NUL-terminated */
1169 if (kern_path(name, 0, &path)) {
1170 printk("nfsd: exp_rootfh path not found %s", name);
1171 return err;
1172 }
1173 inode = path.dentry->d_inode;
1174
1175 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1176 name, path.dentry, clp->name,
1177 inode->i_sb->s_id, inode->i_ino);
1178 exp = exp_parent(clp, &path);
1179 if (IS_ERR(exp)) {
1180 err = PTR_ERR(exp);
1181 goto out;
1182 }
1183
1184 /*
1185 * fh must be initialized before calling fh_compose
1186 */
1187 fh_init(&fh, maxsize);
1188 if (fh_compose(&fh, exp, path.dentry, NULL))
1189 err = -EINVAL;
1190 else
1191 err = 0;
1192 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1193 fh_put(&fh);
1194 exp_put(exp);
1195 out:
1196 path_put(&path);
1197 return err;
1198 }
1199
1200 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1201 u32 *fsidv, struct cache_req *reqp)
1202 {
1203 struct svc_export *exp;
1204 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1205 if (IS_ERR(ek))
1206 return ERR_CAST(ek);
1207
1208 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1209 cache_put(&ek->h, &svc_expkey_cache);
1210
1211 if (IS_ERR(exp))
1212 return ERR_CAST(exp);
1213 return exp;
1214 }
1215
1216 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1217 {
1218 struct exp_flavor_info *f;
1219 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1220
1221 /* legacy gss-only clients are always OK: */
1222 if (exp->ex_client == rqstp->rq_gssclient)
1223 return 0;
1224 /* ip-address based client; check sec= export option: */
1225 for (f = exp->ex_flavors; f < end; f++) {
1226 if (f->pseudoflavor == rqstp->rq_flavor)
1227 return 0;
1228 }
1229 /* defaults in absence of sec= options: */
1230 if (exp->ex_nflavors == 0) {
1231 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1232 rqstp->rq_flavor == RPC_AUTH_UNIX)
1233 return 0;
1234 }
1235 return nfserr_wrongsec;
1236 }
1237
1238 /*
1239 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1240 * auth_unix client) if it's available and has secinfo information;
1241 * otherwise, will try to use rq_gssclient.
1242 *
1243 * Called from functions that handle requests; functions that do work on
1244 * behalf of mountd are passed a single client name to use, and should
1245 * use exp_get_by_name() or exp_find().
1246 */
1247 struct svc_export *
1248 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1249 {
1250 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1251
1252 if (rqstp->rq_client == NULL)
1253 goto gss;
1254
1255 /* First try the auth_unix client: */
1256 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1257 if (PTR_ERR(exp) == -ENOENT)
1258 goto gss;
1259 if (IS_ERR(exp))
1260 return exp;
1261 /* If it has secinfo, assume there are no gss/... clients */
1262 if (exp->ex_nflavors > 0)
1263 return exp;
1264 gss:
1265 /* Otherwise, try falling back on gss client */
1266 if (rqstp->rq_gssclient == NULL)
1267 return exp;
1268 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &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 path *path)
1308 {
1309 struct dentry *saved = dget(path->dentry);
1310 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1311
1312 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1313 struct dentry *parent = dget_parent(path->dentry);
1314 dput(path->dentry);
1315 path->dentry = parent;
1316 exp = rqst_exp_get_by_name(rqstp, path);
1317 }
1318 dput(path->dentry);
1319 path->dentry = saved;
1320 return exp;
1321 }
1322
1323 /*
1324 * Called when we need the filehandle for the root of the pseudofs,
1325 * for a given NFSv4 client. The root is defined to be the
1326 * export point with fsid==0
1327 */
1328 __be32
1329 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1330 {
1331 struct svc_export *exp;
1332 __be32 rv;
1333 u32 fsidv[2];
1334
1335 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1336
1337 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1338 if (IS_ERR(exp))
1339 return nfserrno(PTR_ERR(exp));
1340 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1341 if (rv)
1342 goto out;
1343 rv = check_nfsd_access(exp, rqstp);
1344 if (rv)
1345 fh_put(fhp);
1346 out:
1347 exp_put(exp);
1348 return rv;
1349 }
1350
1351 /* Iterator */
1352
1353 static void *e_start(struct seq_file *m, loff_t *pos)
1354 __acquires(svc_export_cache.hash_lock)
1355 {
1356 loff_t n = *pos;
1357 unsigned hash, export;
1358 struct cache_head *ch;
1359
1360 exp_readlock();
1361 read_lock(&svc_export_cache.hash_lock);
1362 if (!n--)
1363 return SEQ_START_TOKEN;
1364 hash = n >> 32;
1365 export = n & ((1LL<<32) - 1);
1366
1367
1368 for (ch=export_table[hash]; ch; ch=ch->next)
1369 if (!export--)
1370 return ch;
1371 n &= ~((1LL<<32) - 1);
1372 do {
1373 hash++;
1374 n += 1LL<<32;
1375 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1376 if (hash >= EXPORT_HASHMAX)
1377 return NULL;
1378 *pos = n+1;
1379 return export_table[hash];
1380 }
1381
1382 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1383 {
1384 struct cache_head *ch = p;
1385 int hash = (*pos >> 32);
1386
1387 if (p == SEQ_START_TOKEN)
1388 hash = 0;
1389 else if (ch->next == NULL) {
1390 hash++;
1391 *pos += 1LL<<32;
1392 } else {
1393 ++*pos;
1394 return ch->next;
1395 }
1396 *pos &= ~((1LL<<32) - 1);
1397 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1398 hash++;
1399 *pos += 1LL<<32;
1400 }
1401 if (hash >= EXPORT_HASHMAX)
1402 return NULL;
1403 ++*pos;
1404 return export_table[hash];
1405 }
1406
1407 static void e_stop(struct seq_file *m, void *p)
1408 __releases(svc_export_cache.hash_lock)
1409 {
1410 read_unlock(&svc_export_cache.hash_lock);
1411 exp_readunlock();
1412 }
1413
1414 static struct flags {
1415 int flag;
1416 char *name[2];
1417 } expflags[] = {
1418 { NFSEXP_READONLY, {"ro", "rw"}},
1419 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1420 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1421 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1422 { NFSEXP_ASYNC, {"async", "sync"}},
1423 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1424 { NFSEXP_NOHIDE, {"nohide", ""}},
1425 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1426 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1427 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1428 #ifdef MSNFS
1429 { NFSEXP_MSNFS, {"msnfs", ""}},
1430 #endif
1431 { 0, {"", ""}}
1432 };
1433
1434 static void show_expflags(struct seq_file *m, int flags, int mask)
1435 {
1436 struct flags *flg;
1437 int state, first = 0;
1438
1439 for (flg = expflags; flg->flag; flg++) {
1440 if (flg->flag & ~mask)
1441 continue;
1442 state = (flg->flag & flags) ? 0 : 1;
1443 if (*flg->name[state])
1444 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1445 }
1446 }
1447
1448 static void show_secinfo_flags(struct seq_file *m, int flags)
1449 {
1450 seq_printf(m, ",");
1451 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1452 }
1453
1454 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1455 {
1456 struct exp_flavor_info *f;
1457 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1458 int lastflags = 0, first = 0;
1459
1460 if (exp->ex_nflavors == 0)
1461 return;
1462 for (f = exp->ex_flavors; f < end; f++) {
1463 if (first || f->flags != lastflags) {
1464 if (!first)
1465 show_secinfo_flags(m, lastflags);
1466 seq_printf(m, ",sec=%d", f->pseudoflavor);
1467 lastflags = f->flags;
1468 } else {
1469 seq_printf(m, ":%d", f->pseudoflavor);
1470 }
1471 }
1472 show_secinfo_flags(m, lastflags);
1473 }
1474
1475 static void exp_flags(struct seq_file *m, int flag, int fsid,
1476 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1477 {
1478 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1479 if (flag & NFSEXP_FSID)
1480 seq_printf(m, ",fsid=%d", fsid);
1481 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1482 seq_printf(m, ",anonuid=%u", anonu);
1483 if (anong != (gid_t)-2 && anong != (0x10000-2))
1484 seq_printf(m, ",anongid=%u", anong);
1485 if (fsloc && fsloc->locations_count > 0) {
1486 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1487 int i;
1488
1489 seq_printf(m, ",%s=", loctype);
1490 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1491 seq_putc(m, '@');
1492 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1493 for (i = 1; i < fsloc->locations_count; i++) {
1494 seq_putc(m, ';');
1495 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1496 seq_putc(m, '@');
1497 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1498 }
1499 }
1500 }
1501
1502 static int e_show(struct seq_file *m, void *p)
1503 {
1504 struct cache_head *cp = p;
1505 struct svc_export *exp = container_of(cp, struct svc_export, h);
1506
1507 if (p == SEQ_START_TOKEN) {
1508 seq_puts(m, "# Version 1.1\n");
1509 seq_puts(m, "# Path Client(Flags) # IPs\n");
1510 return 0;
1511 }
1512
1513 cache_get(&exp->h);
1514 if (cache_check(&svc_export_cache, &exp->h, NULL))
1515 return 0;
1516 cache_put(&exp->h, &svc_export_cache);
1517 return svc_export_show(m, &svc_export_cache, cp);
1518 }
1519
1520 const struct seq_operations nfs_exports_op = {
1521 .start = e_start,
1522 .next = e_next,
1523 .stop = e_stop,
1524 .show = e_show,
1525 };
1526
1527 /*
1528 * Add or modify a client.
1529 * Change requests may involve the list of host addresses. The list of
1530 * exports and possibly existing uid maps are left untouched.
1531 */
1532 int
1533 exp_addclient(struct nfsctl_client *ncp)
1534 {
1535 struct auth_domain *dom;
1536 int i, err;
1537 struct in6_addr addr6;
1538
1539 /* First, consistency check. */
1540 err = -EINVAL;
1541 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1542 goto out;
1543 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1544 goto out;
1545
1546 /* Lock the hashtable */
1547 exp_writelock();
1548
1549 dom = unix_domain_find(ncp->cl_ident);
1550
1551 err = -ENOMEM;
1552 if (!dom)
1553 goto out_unlock;
1554
1555 /* Insert client into hashtable. */
1556 for (i = 0; i < ncp->cl_naddr; i++) {
1557 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1558 auth_unix_add_addr(&addr6, dom);
1559 }
1560 auth_unix_forget_old(dom);
1561 auth_domain_put(dom);
1562
1563 err = 0;
1564
1565 out_unlock:
1566 exp_writeunlock();
1567 out:
1568 return err;
1569 }
1570
1571 /*
1572 * Delete a client given an identifier.
1573 */
1574 int
1575 exp_delclient(struct nfsctl_client *ncp)
1576 {
1577 int err;
1578 struct auth_domain *dom;
1579
1580 err = -EINVAL;
1581 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1582 goto out;
1583
1584 /* Lock the hashtable */
1585 exp_writelock();
1586
1587 dom = auth_domain_find(ncp->cl_ident);
1588 /* just make sure that no addresses work
1589 * and that it will expire soon
1590 */
1591 if (dom) {
1592 err = auth_unix_forget_old(dom);
1593 auth_domain_put(dom);
1594 }
1595
1596 exp_writeunlock();
1597 out:
1598 return err;
1599 }
1600
1601 /*
1602 * Verify that string is non-empty and does not exceed max length.
1603 */
1604 static int
1605 exp_verify_string(char *cp, int max)
1606 {
1607 int i;
1608
1609 for (i = 0; i < max; i++)
1610 if (!cp[i])
1611 return i;
1612 cp[i] = 0;
1613 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1614 return 0;
1615 }
1616
1617 /*
1618 * Initialize the exports module.
1619 */
1620 int
1621 nfsd_export_init(void)
1622 {
1623 int rv;
1624 dprintk("nfsd: initializing export module.\n");
1625
1626 rv = cache_register(&svc_export_cache);
1627 if (rv)
1628 return rv;
1629 rv = cache_register(&svc_expkey_cache);
1630 if (rv)
1631 cache_unregister(&svc_export_cache);
1632 return rv;
1633
1634 }
1635
1636 /*
1637 * Flush exports table - called when last nfsd thread is killed
1638 */
1639 void
1640 nfsd_export_flush(void)
1641 {
1642 exp_writelock();
1643 cache_purge(&svc_expkey_cache);
1644 cache_purge(&svc_export_cache);
1645 exp_writeunlock();
1646 }
1647
1648 /*
1649 * Shutdown the exports module.
1650 */
1651 void
1652 nfsd_export_shutdown(void)
1653 {
1654
1655 dprintk("nfsd: shutting down export module.\n");
1656
1657 exp_writelock();
1658
1659 cache_unregister(&svc_expkey_cache);
1660 cache_unregister(&svc_export_cache);
1661 svcauth_unix_purge();
1662
1663 exp_writeunlock();
1664 dprintk("nfsd: export shutdown complete.\n");
1665 }
Linux with added FPC-III support