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IPVS: fix netns if reading ip_vs_* procfs entries
[linux-2.6/linux-mips.git] / fs / nfsd / export.c
blobad000aeb21a2aa85d351b32038f57032cfb8a78e
1 /*
2 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
14 #include <linux/slab.h>
15 #include <linux/namei.h>
16 #include <linux/module.h>
17 #include <linux/exportfs.h>
18
19 #include <linux/nfsd/syscall.h>
20 #include <net/ipv6.h>
21
22 #include "nfsd.h"
23 #include "nfsfh.h"
24
25 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27 typedef struct auth_domain svc_client;
28 typedef struct svc_export svc_export;
29
30 /*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39 #define EXPKEY_HASHBITS 8
40 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
43
44 static void expkey_put(struct kref *ref)
45 {
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
52 kfree(key);
53 }
54
55 static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58 {
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68 }
69
70 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
71 {
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
73 }
74
75 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
77 static struct cache_detail svc_expkey_cache;
78
79 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
80 {
81 /* client fsidtype fsid [path] */
82 char *buf;
83 int len;
84 struct auth_domain *dom = NULL;
85 int err;
86 int fsidtype;
87 char *ep;
88 struct svc_expkey key;
89 struct svc_expkey *ek = NULL;
90
91 if (mesg[mlen-1] != '\n')
92 return -EINVAL;
93 mesg[mlen-1] = 0;
94
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 err = -ENOMEM;
97 if (!buf)
98 goto out;
99
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103
104 err = -ENOENT;
105 dom = auth_domain_find(buf);
106 if (!dom)
107 goto out;
108 dprintk("found domain %s\n", buf);
109
110 err = -EINVAL;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 fsidtype = simple_strtoul(buf, &ep, 10);
114 if (*ep)
115 goto out;
116 dprintk("found fsidtype %d\n", fsidtype);
117 if (key_len(fsidtype)==0) /* invalid type */
118 goto out;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
123 goto out;
124
125 /* OK, we seem to have a valid key */
126 key.h.flags = 0;
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
129 goto out;
130
131 key.ek_client = dom;
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
134
135 ek = svc_expkey_lookup(&key);
136 err = -ENOMEM;
137 if (!ek)
138 goto out;
139
140 /* now we want a pathname, or empty meaning NEGATIVE */
141 err = -EINVAL;
142 len = qword_get(&mesg, buf, PAGE_SIZE);
143 if (len < 0)
144 goto out;
145 dprintk("Path seems to be <%s>\n", buf);
146 err = 0;
147 if (len == 0) {
148 set_bit(CACHE_NEGATIVE, &key.h.flags);
149 ek = svc_expkey_update(&key, ek);
150 if (!ek)
151 err = -ENOMEM;
152 } else {
153 err = kern_path(buf, 0, &key.ek_path);
154 if (err)
155 goto out;
156
157 dprintk("Found the path %s\n", buf);
158
159 ek = svc_expkey_update(&key, ek);
160 if (!ek)
161 err = -ENOMEM;
162 path_put(&key.ek_path);
163 }
164 cache_flush();
165 out:
166 if (ek)
167 cache_put(&ek->h, &svc_expkey_cache);
168 if (dom)
169 auth_domain_put(dom);
170 kfree(buf);
171 return err;
172 }
173
174 static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
177 {
178 struct svc_expkey *ek ;
179 int i;
180
181 if (h ==NULL) {
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
183 return 0;
184 }
185 ek = container_of(h, struct svc_expkey, h);
186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
187 ek->ek_fsidtype);
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
192 seq_printf(m, " ");
193 seq_path(m, &ek->ek_path, "\\ \t\n");
194 }
195 seq_printf(m, "\n");
196 return 0;
197 }
198
199 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
200 {
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
203
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
207 return 0;
208 return 1;
209 }
210
211 static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
213 {
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
216
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
220
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
222 }
223
224 static inline void expkey_update(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 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
232 }
233
234 static struct cache_head *expkey_alloc(void)
235 {
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
237 if (i)
238 return &i->h;
239 else
240 return NULL;
241 }
242
243 static struct cache_detail svc_expkey_cache = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
247 .name = "nfsd.fh",
248 .cache_put = expkey_put,
249 .cache_upcall = expkey_upcall,
250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
252 .match = expkey_match,
253 .init = expkey_init,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
256 };
257
258 static int
259 svc_expkey_hash(struct svc_expkey *item)
260 {
261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
264
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
268 return hash;
269 }
270
271 static struct svc_expkey *
272 svc_expkey_lookup(struct svc_expkey *item)
273 {
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
276
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 hash);
279 if (ch)
280 return container_of(ch, struct svc_expkey, h);
281 else
282 return NULL;
283 }
284
285 static struct svc_expkey *
286 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
287 {
288 struct cache_head *ch;
289 int hash = svc_expkey_hash(new);
290
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
292 &old->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297 }
298
299
300 #define EXPORT_HASHBITS 8
301 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
302
303 static struct cache_head *export_table[EXPORT_HASHMAX];
304
305 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
306 {
307 int i;
308
309 for (i = 0; i < fsloc->locations_count; i++) {
310 kfree(fsloc->locations[i].path);
311 kfree(fsloc->locations[i].hosts);
312 }
313 kfree(fsloc->locations);
314 }
315
316 static void svc_export_put(struct kref *ref)
317 {
318 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
319 path_put(&exp->ex_path);
320 auth_domain_put(exp->ex_client);
321 kfree(exp->ex_pathname);
322 nfsd4_fslocs_free(&exp->ex_fslocs);
323 kfree(exp);
324 }
325
326 static void svc_export_request(struct cache_detail *cd,
327 struct cache_head *h,
328 char **bpp, int *blen)
329 {
330 /* client path */
331 struct svc_export *exp = container_of(h, struct svc_export, h);
332 char *pth;
333
334 qword_add(bpp, blen, exp->ex_client->name);
335 pth = d_path(&exp->ex_path, *bpp, *blen);
336 if (IS_ERR(pth)) {
337 /* is this correct? */
338 (*bpp)[0] = '\n';
339 return;
340 }
341 qword_add(bpp, blen, pth);
342 (*bpp)[-1] = '\n';
343 }
344
345 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
346 {
347 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
348 }
349
350 static struct svc_export *svc_export_update(struct svc_export *new,
351 struct svc_export *old);
352 static struct svc_export *svc_export_lookup(struct svc_export *);
353
354 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
355 {
356
357 /*
358 * We currently export only dirs, regular files, and (for v4
359 * pseudoroot) symlinks.
360 */
361 if (!S_ISDIR(inode->i_mode) &&
362 !S_ISLNK(inode->i_mode) &&
363 !S_ISREG(inode->i_mode))
364 return -ENOTDIR;
365
366 /*
367 * Mountd should never pass down a writeable V4ROOT export, but,
368 * just to make sure:
369 */
370 if (*flags & NFSEXP_V4ROOT)
371 *flags |= NFSEXP_READONLY;
372
373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
381 !(*flags & NFSEXP_FSID) &&
382 uuid == NULL) {
383 dprintk("exp_export: export of non-dev fs without fsid\n");
384 return -EINVAL;
385 }
386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
393 return 0;
394
395 }
396
397 #ifdef CONFIG_NFSD_V4
398
399 static int
400 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401 {
402 int len;
403 int migrated, i, err;
404
405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447 out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450 }
451
452 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453 {
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
468 * XXX: It would be nice to also check whether this
469 * pseudoflavor is supported, so we can discover the
470 * problem at export time instead of when a client fails
471 * to authenticate.
472 */
473 err = get_int(mesg, &f->flags);
474 if (err)
475 return err;
476 /* Only some flags are allowed to differ between flavors: */
477 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
478 return -EINVAL;
479 }
480 exp->ex_nflavors = listsize;
481 return 0;
482 }
483
484 #else /* CONFIG_NFSD_V4 */
485 static inline int
486 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
487 static inline int
488 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
489 #endif
490
491 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
492 {
493 /* client path expiry [flags anonuid anongid fsid] */
494 char *buf;
495 int len;
496 int err;
497 struct auth_domain *dom = NULL;
498 struct svc_export exp = {}, *expp;
499 int an_int;
500
501 if (mesg[mlen-1] != '\n')
502 return -EINVAL;
503 mesg[mlen-1] = 0;
504
505 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
506 if (!buf)
507 return -ENOMEM;
508
509 /* client */
510 err = -EINVAL;
511 len = qword_get(&mesg, buf, PAGE_SIZE);
512 if (len <= 0)
513 goto out;
514
515 err = -ENOENT;
516 dom = auth_domain_find(buf);
517 if (!dom)
518 goto out;
519
520 /* path */
521 err = -EINVAL;
522 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
523 goto out1;
524
525 err = kern_path(buf, 0, &exp.ex_path);
526 if (err)
527 goto out1;
528
529 exp.ex_client = dom;
530
531 err = -ENOMEM;
532 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
533 if (!exp.ex_pathname)
534 goto out2;
535
536 /* expiry */
537 err = -EINVAL;
538 exp.h.expiry_time = get_expiry(&mesg);
539 if (exp.h.expiry_time == 0)
540 goto out3;
541
542 /* flags */
543 err = get_int(&mesg, &an_int);
544 if (err == -ENOENT) {
545 err = 0;
546 set_bit(CACHE_NEGATIVE, &exp.h.flags);
547 } else {
548 if (err || an_int < 0)
549 goto out3;
550 exp.ex_flags= an_int;
551
552 /* anon uid */
553 err = get_int(&mesg, &an_int);
554 if (err)
555 goto out3;
556 exp.ex_anon_uid= an_int;
557
558 /* anon gid */
559 err = get_int(&mesg, &an_int);
560 if (err)
561 goto out3;
562 exp.ex_anon_gid= an_int;
563
564 /* fsid */
565 err = get_int(&mesg, &an_int);
566 if (err)
567 goto out3;
568 exp.ex_fsid = an_int;
569
570 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
571 if (strcmp(buf, "fsloc") == 0)
572 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
573 else if (strcmp(buf, "uuid") == 0) {
574 /* expect a 16 byte uuid encoded as \xXXXX... */
575 len = qword_get(&mesg, buf, PAGE_SIZE);
576 if (len != 16)
577 err = -EINVAL;
578 else {
579 exp.ex_uuid =
580 kmemdup(buf, 16, GFP_KERNEL);
581 if (exp.ex_uuid == NULL)
582 err = -ENOMEM;
583 }
584 } else if (strcmp(buf, "secinfo") == 0)
585 err = secinfo_parse(&mesg, buf, &exp);
586 else
587 /* quietly ignore unknown words and anything
588 * following. Newer user-space can try to set
589 * new values, then see what the result was.
590 */
591 break;
592 if (err)
593 goto out4;
594 }
595
596 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
597 exp.ex_uuid);
598 if (err)
599 goto out4;
600 }
601
602 expp = svc_export_lookup(&exp);
603 if (expp)
604 expp = svc_export_update(&exp, expp);
605 else
606 err = -ENOMEM;
607 cache_flush();
608 if (expp == NULL)
609 err = -ENOMEM;
610 else
611 exp_put(expp);
612 out4:
613 nfsd4_fslocs_free(&exp.ex_fslocs);
614 kfree(exp.ex_uuid);
615 out3:
616 kfree(exp.ex_pathname);
617 out2:
618 path_put(&exp.ex_path);
619 out1:
620 auth_domain_put(dom);
621 out:
622 kfree(buf);
623 return err;
624 }
625
626 static void exp_flags(struct seq_file *m, int flag, int fsid,
627 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
628 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
629
630 static int svc_export_show(struct seq_file *m,
631 struct cache_detail *cd,
632 struct cache_head *h)
633 {
634 struct svc_export *exp ;
635
636 if (h ==NULL) {
637 seq_puts(m, "#path domain(flags)\n");
638 return 0;
639 }
640 exp = container_of(h, struct svc_export, h);
641 seq_path(m, &exp->ex_path, " \t\n\\");
642 seq_putc(m, '\t');
643 seq_escape(m, exp->ex_client->name, " \t\n\\");
644 seq_putc(m, '(');
645 if (test_bit(CACHE_VALID, &h->flags) &&
646 !test_bit(CACHE_NEGATIVE, &h->flags)) {
647 exp_flags(m, exp->ex_flags, exp->ex_fsid,
648 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
649 if (exp->ex_uuid) {
650 int i;
651 seq_puts(m, ",uuid=");
652 for (i=0; i<16; i++) {
653 if ((i&3) == 0 && i)
654 seq_putc(m, ':');
655 seq_printf(m, "%02x", exp->ex_uuid[i]);
656 }
657 }
658 show_secinfo(m, exp);
659 }
660 seq_puts(m, ")\n");
661 return 0;
662 }
663 static int svc_export_match(struct cache_head *a, struct cache_head *b)
664 {
665 struct svc_export *orig = container_of(a, struct svc_export, h);
666 struct svc_export *new = container_of(b, struct svc_export, h);
667 return orig->ex_client == new->ex_client &&
668 orig->ex_path.dentry == new->ex_path.dentry &&
669 orig->ex_path.mnt == new->ex_path.mnt;
670 }
671
672 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
673 {
674 struct svc_export *new = container_of(cnew, struct svc_export, h);
675 struct svc_export *item = container_of(citem, struct svc_export, h);
676
677 kref_get(&item->ex_client->ref);
678 new->ex_client = item->ex_client;
679 new->ex_path.dentry = dget(item->ex_path.dentry);
680 new->ex_path.mnt = mntget(item->ex_path.mnt);
681 new->ex_pathname = NULL;
682 new->ex_fslocs.locations = NULL;
683 new->ex_fslocs.locations_count = 0;
684 new->ex_fslocs.migrated = 0;
685 }
686
687 static void export_update(struct cache_head *cnew, struct cache_head *citem)
688 {
689 struct svc_export *new = container_of(cnew, struct svc_export, h);
690 struct svc_export *item = container_of(citem, struct svc_export, h);
691 int i;
692
693 new->ex_flags = item->ex_flags;
694 new->ex_anon_uid = item->ex_anon_uid;
695 new->ex_anon_gid = item->ex_anon_gid;
696 new->ex_fsid = item->ex_fsid;
697 new->ex_uuid = item->ex_uuid;
698 item->ex_uuid = NULL;
699 new->ex_pathname = item->ex_pathname;
700 item->ex_pathname = NULL;
701 new->ex_fslocs.locations = item->ex_fslocs.locations;
702 item->ex_fslocs.locations = NULL;
703 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
704 item->ex_fslocs.locations_count = 0;
705 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
706 item->ex_fslocs.migrated = 0;
707 new->ex_nflavors = item->ex_nflavors;
708 for (i = 0; i < MAX_SECINFO_LIST; i++) {
709 new->ex_flavors[i] = item->ex_flavors[i];
710 }
711 }
712
713 static struct cache_head *svc_export_alloc(void)
714 {
715 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
716 if (i)
717 return &i->h;
718 else
719 return NULL;
720 }
721
722 struct cache_detail svc_export_cache = {
723 .owner = THIS_MODULE,
724 .hash_size = EXPORT_HASHMAX,
725 .hash_table = export_table,
726 .name = "nfsd.export",
727 .cache_put = svc_export_put,
728 .cache_upcall = svc_export_upcall,
729 .cache_parse = svc_export_parse,
730 .cache_show = svc_export_show,
731 .match = svc_export_match,
732 .init = svc_export_init,
733 .update = export_update,
734 .alloc = svc_export_alloc,
735 };
736
737 static int
738 svc_export_hash(struct svc_export *exp)
739 {
740 int hash;
741
742 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
743 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
745 return hash;
746 }
747
748 static struct svc_export *
749 svc_export_lookup(struct svc_export *exp)
750 {
751 struct cache_head *ch;
752 int hash = svc_export_hash(exp);
753
754 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
755 hash);
756 if (ch)
757 return container_of(ch, struct svc_export, h);
758 else
759 return NULL;
760 }
761
762 static struct svc_export *
763 svc_export_update(struct svc_export *new, struct svc_export *old)
764 {
765 struct cache_head *ch;
766 int hash = svc_export_hash(old);
767
768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
769 &old->h,
770 hash);
771 if (ch)
772 return container_of(ch, struct svc_export, h);
773 else
774 return NULL;
775 }
776
777
778 static struct svc_expkey *
779 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780 {
781 struct svc_expkey key, *ek;
782 int err;
783
784 if (!clp)
785 return ERR_PTR(-ENOENT);
786
787 key.ek_client = clp;
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790
791 ek = svc_expkey_lookup(&key);
792 if (ek == NULL)
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
795 if (err)
796 return ERR_PTR(err);
797 return ek;
798 }
799
800 #ifdef CONFIG_NFSD_DEPRECATED
801 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
802 struct svc_export *exp)
803 {
804 struct svc_expkey key, *ek;
805
806 key.ek_client = clp;
807 key.ek_fsidtype = fsid_type;
808 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
809 key.ek_path = exp->ex_path;
810 key.h.expiry_time = NEVER;
811 key.h.flags = 0;
812
813 ek = svc_expkey_lookup(&key);
814 if (ek)
815 ek = svc_expkey_update(&key,ek);
816 if (ek) {
817 cache_put(&ek->h, &svc_expkey_cache);
818 return 0;
819 }
820 return -ENOMEM;
821 }
822
823 /*
824 * Find the client's export entry matching xdev/xino.
825 */
826 static inline struct svc_expkey *
827 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
828 {
829 u32 fsidv[3];
830
831 if (old_valid_dev(dev)) {
832 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
833 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
834 }
835 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
836 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
837 }
838
839 /*
840 * Find the client's export entry matching fsid
841 */
842 static inline struct svc_expkey *
843 exp_get_fsid_key(svc_client *clp, int fsid)
844 {
845 u32 fsidv[2];
846
847 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
848
849 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
850 }
851 #endif
852
853 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
854 struct cache_req *reqp)
855 {
856 struct svc_export *exp, key;
857 int err;
858
859 if (!clp)
860 return ERR_PTR(-ENOENT);
861
862 key.ex_client = clp;
863 key.ex_path = *path;
864
865 exp = svc_export_lookup(&key);
866 if (exp == NULL)
867 return ERR_PTR(-ENOMEM);
868 err = cache_check(&svc_export_cache, &exp->h, reqp);
869 if (err)
870 return ERR_PTR(err);
871 return exp;
872 }
873
874 /*
875 * Find the export entry for a given dentry.
876 */
877 static struct svc_export *exp_parent(svc_client *clp, struct path *path)
878 {
879 struct dentry *saved = dget(path->dentry);
880 svc_export *exp = exp_get_by_name(clp, path, NULL);
881
882 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
883 struct dentry *parent = dget_parent(path->dentry);
884 dput(path->dentry);
885 path->dentry = parent;
886 exp = exp_get_by_name(clp, path, NULL);
887 }
888 dput(path->dentry);
889 path->dentry = saved;
890 return exp;
891 }
892
893 #ifdef CONFIG_NFSD_DEPRECATED
894 /*
895 * Hashtable locking. Write locks are placed only by user processes
896 * wanting to modify export information.
897 * Write locking only done in this file. Read locking
898 * needed externally.
899 */
900
901 static DECLARE_RWSEM(hash_sem);
902
903 void
904 exp_readlock(void)
905 {
906 down_read(&hash_sem);
907 }
908
909 static inline void
910 exp_writelock(void)
911 {
912 down_write(&hash_sem);
913 }
914
915 void
916 exp_readunlock(void)
917 {
918 up_read(&hash_sem);
919 }
920
921 static inline void
922 exp_writeunlock(void)
923 {
924 up_write(&hash_sem);
925 }
926 #else
927
928 /* hash_sem not needed once deprecated interface is removed */
929 void exp_readlock(void) {}
930 static inline void exp_writelock(void){}
931 void exp_readunlock(void) {}
932 static inline void exp_writeunlock(void){}
933
934 #endif
935
936 #ifdef CONFIG_NFSD_DEPRECATED
937 static void exp_do_unexport(svc_export *unexp);
938 static int exp_verify_string(char *cp, int max);
939
940 static void exp_fsid_unhash(struct svc_export *exp)
941 {
942 struct svc_expkey *ek;
943
944 if ((exp->ex_flags & NFSEXP_FSID) == 0)
945 return;
946
947 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
948 if (!IS_ERR(ek)) {
949 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
950 cache_put(&ek->h, &svc_expkey_cache);
951 }
952 }
953
954 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
955 {
956 u32 fsid[2];
957
958 if ((exp->ex_flags & NFSEXP_FSID) == 0)
959 return 0;
960
961 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
962 return exp_set_key(clp, FSID_NUM, fsid, exp);
963 }
964
965 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
966 {
967 u32 fsid[2];
968 struct inode *inode = exp->ex_path.dentry->d_inode;
969 dev_t dev = inode->i_sb->s_dev;
970
971 if (old_valid_dev(dev)) {
972 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
973 return exp_set_key(clp, FSID_DEV, fsid, exp);
974 }
975 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
976 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
977 }
978
979 static void exp_unhash(struct svc_export *exp)
980 {
981 struct svc_expkey *ek;
982 struct inode *inode = exp->ex_path.dentry->d_inode;
983
984 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
985 if (!IS_ERR(ek)) {
986 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
987 cache_put(&ek->h, &svc_expkey_cache);
988 }
989 }
990
991 /*
992 * Export a file system.
993 */
994 int
995 exp_export(struct nfsctl_export *nxp)
996 {
997 svc_client *clp;
998 struct svc_export *exp = NULL;
999 struct svc_export new;
1000 struct svc_expkey *fsid_key = NULL;
1001 struct path path;
1002 int err;
1003
1004 /* Consistency check */
1005 err = -EINVAL;
1006 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1007 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1008 goto out;
1009
1010 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1011 nxp->ex_client, nxp->ex_path,
1012 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1013 nxp->ex_flags);
1014
1015 /* Try to lock the export table for update */
1016 exp_writelock();
1017
1018 /* Look up client info */
1019 if (!(clp = auth_domain_find(nxp->ex_client)))
1020 goto out_unlock;
1021
1022
1023 /* Look up the dentry */
1024 err = kern_path(nxp->ex_path, 0, &path);
1025 if (err)
1026 goto out_put_clp;
1027 err = -EINVAL;
1028
1029 exp = exp_get_by_name(clp, &path, NULL);
1030
1031 memset(&new, 0, sizeof(new));
1032
1033 /* must make sure there won't be an ex_fsid clash */
1034 if ((nxp->ex_flags & NFSEXP_FSID) &&
1035 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1036 fsid_key->ek_path.mnt &&
1037 (fsid_key->ek_path.mnt != path.mnt ||
1038 fsid_key->ek_path.dentry != path.dentry))
1039 goto finish;
1040
1041 if (!IS_ERR(exp)) {
1042 /* just a flags/id/fsid update */
1043
1044 exp_fsid_unhash(exp);
1045 exp->ex_flags = nxp->ex_flags;
1046 exp->ex_anon_uid = nxp->ex_anon_uid;
1047 exp->ex_anon_gid = nxp->ex_anon_gid;
1048 exp->ex_fsid = nxp->ex_dev;
1049
1050 err = exp_fsid_hash(clp, exp);
1051 goto finish;
1052 }
1053
1054 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1055 if (err) goto finish;
1056
1057 err = -ENOMEM;
1058
1059 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1060
1061 new.h.expiry_time = NEVER;
1062 new.h.flags = 0;
1063 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1064 if (!new.ex_pathname)
1065 goto finish;
1066 new.ex_client = clp;
1067 new.ex_path = path;
1068 new.ex_flags = nxp->ex_flags;
1069 new.ex_anon_uid = nxp->ex_anon_uid;
1070 new.ex_anon_gid = nxp->ex_anon_gid;
1071 new.ex_fsid = nxp->ex_dev;
1072
1073 exp = svc_export_lookup(&new);
1074 if (exp)
1075 exp = svc_export_update(&new, exp);
1076
1077 if (!exp)
1078 goto finish;
1079
1080 if (exp_hash(clp, exp) ||
1081 exp_fsid_hash(clp, exp)) {
1082 /* failed to create at least one index */
1083 exp_do_unexport(exp);
1084 cache_flush();
1085 } else
1086 err = 0;
1087 finish:
1088 kfree(new.ex_pathname);
1089 if (!IS_ERR_OR_NULL(exp))
1090 exp_put(exp);
1091 if (!IS_ERR_OR_NULL(fsid_key))
1092 cache_put(&fsid_key->h, &svc_expkey_cache);
1093 path_put(&path);
1094 out_put_clp:
1095 auth_domain_put(clp);
1096 out_unlock:
1097 exp_writeunlock();
1098 out:
1099 return err;
1100 }
1101
1102 /*
1103 * Unexport a file system. The export entry has already
1104 * been removed from the client's list of exported fs's.
1105 */
1106 static void
1107 exp_do_unexport(svc_export *unexp)
1108 {
1109 sunrpc_invalidate(&unexp->h, &svc_export_cache);
1110 exp_unhash(unexp);
1111 exp_fsid_unhash(unexp);
1112 }
1113
1114
1115 /*
1116 * unexport syscall.
1117 */
1118 int
1119 exp_unexport(struct nfsctl_export *nxp)
1120 {
1121 struct auth_domain *dom;
1122 svc_export *exp;
1123 struct path path;
1124 int err;
1125
1126 /* Consistency check */
1127 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1128 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1129 return -EINVAL;
1130
1131 exp_writelock();
1132
1133 err = -EINVAL;
1134 dom = auth_domain_find(nxp->ex_client);
1135 if (!dom) {
1136 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1137 goto out_unlock;
1138 }
1139
1140 err = kern_path(nxp->ex_path, 0, &path);
1141 if (err)
1142 goto out_domain;
1143
1144 err = -EINVAL;
1145 exp = exp_get_by_name(dom, &path, NULL);
1146 path_put(&path);
1147 if (IS_ERR(exp))
1148 goto out_domain;
1149
1150 exp_do_unexport(exp);
1151 exp_put(exp);
1152 err = 0;
1153
1154 out_domain:
1155 auth_domain_put(dom);
1156 cache_flush();
1157 out_unlock:
1158 exp_writeunlock();
1159 return err;
1160 }
1161 #endif /* CONFIG_NFSD_DEPRECATED */
1162
1163 /*
1164 * Obtain the root fh on behalf of a client.
1165 * This could be done in user space, but I feel that it adds some safety
1166 * since its harder to fool a kernel module than a user space program.
1167 */
1168 int
1169 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1170 {
1171 struct svc_export *exp;
1172 struct path path;
1173 struct inode *inode;
1174 struct svc_fh fh;
1175 int err;
1176
1177 err = -EPERM;
1178 /* NB: we probably ought to check that it's NUL-terminated */
1179 if (kern_path(name, 0, &path)) {
1180 printk("nfsd: exp_rootfh path not found %s", name);
1181 return err;
1182 }
1183 inode = path.dentry->d_inode;
1184
1185 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1186 name, path.dentry, clp->name,
1187 inode->i_sb->s_id, inode->i_ino);
1188 exp = exp_parent(clp, &path);
1189 if (IS_ERR(exp)) {
1190 err = PTR_ERR(exp);
1191 goto out;
1192 }
1193
1194 /*
1195 * fh must be initialized before calling fh_compose
1196 */
1197 fh_init(&fh, maxsize);
1198 if (fh_compose(&fh, exp, path.dentry, NULL))
1199 err = -EINVAL;
1200 else
1201 err = 0;
1202 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1203 fh_put(&fh);
1204 exp_put(exp);
1205 out:
1206 path_put(&path);
1207 return err;
1208 }
1209
1210 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1211 u32 *fsidv, struct cache_req *reqp)
1212 {
1213 struct svc_export *exp;
1214 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1215 if (IS_ERR(ek))
1216 return ERR_CAST(ek);
1217
1218 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1219 cache_put(&ek->h, &svc_expkey_cache);
1220
1221 if (IS_ERR(exp))
1222 return ERR_CAST(exp);
1223 return exp;
1224 }
1225
1226 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1227 {
1228 struct exp_flavor_info *f;
1229 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1230
1231 /* legacy gss-only clients are always OK: */
1232 if (exp->ex_client == rqstp->rq_gssclient)
1233 return 0;
1234 /* ip-address based client; check sec= export option: */
1235 for (f = exp->ex_flavors; f < end; f++) {
1236 if (f->pseudoflavor == rqstp->rq_flavor)
1237 return 0;
1238 }
1239 /* defaults in absence of sec= options: */
1240 if (exp->ex_nflavors == 0) {
1241 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1242 rqstp->rq_flavor == RPC_AUTH_UNIX)
1243 return 0;
1244 }
1245 return nfserr_wrongsec;
1246 }
1247
1248 /*
1249 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1250 * auth_unix client) if it's available and has secinfo information;
1251 * otherwise, will try to use rq_gssclient.
1252 *
1253 * Called from functions that handle requests; functions that do work on
1254 * behalf of mountd are passed a single client name to use, and should
1255 * use exp_get_by_name() or exp_find().
1256 */
1257 struct svc_export *
1258 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1259 {
1260 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1261
1262 if (rqstp->rq_client == NULL)
1263 goto gss;
1264
1265 /* First try the auth_unix client: */
1266 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1267 if (PTR_ERR(exp) == -ENOENT)
1268 goto gss;
1269 if (IS_ERR(exp))
1270 return exp;
1271 /* If it has secinfo, assume there are no gss/... clients */
1272 if (exp->ex_nflavors > 0)
1273 return exp;
1274 gss:
1275 /* Otherwise, try falling back on gss client */
1276 if (rqstp->rq_gssclient == NULL)
1277 return exp;
1278 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1279 if (PTR_ERR(gssexp) == -ENOENT)
1280 return exp;
1281 if (!IS_ERR(exp))
1282 exp_put(exp);
1283 return gssexp;
1284 }
1285
1286 struct svc_export *
1287 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1288 {
1289 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1290
1291 if (rqstp->rq_client == NULL)
1292 goto gss;
1293
1294 /* First try the auth_unix client: */
1295 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1296 if (PTR_ERR(exp) == -ENOENT)
1297 goto gss;
1298 if (IS_ERR(exp))
1299 return exp;
1300 /* If it has secinfo, assume there are no gss/... clients */
1301 if (exp->ex_nflavors > 0)
1302 return exp;
1303 gss:
1304 /* Otherwise, try falling back on gss client */
1305 if (rqstp->rq_gssclient == NULL)
1306 return exp;
1307 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1308 &rqstp->rq_chandle);
1309 if (PTR_ERR(gssexp) == -ENOENT)
1310 return exp;
1311 if (!IS_ERR(exp))
1312 exp_put(exp);
1313 return gssexp;
1314 }
1315
1316 struct svc_export *
1317 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1318 {
1319 struct dentry *saved = dget(path->dentry);
1320 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1321
1322 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1323 struct dentry *parent = dget_parent(path->dentry);
1324 dput(path->dentry);
1325 path->dentry = parent;
1326 exp = rqst_exp_get_by_name(rqstp, path);
1327 }
1328 dput(path->dentry);
1329 path->dentry = saved;
1330 return exp;
1331 }
1332
1333 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1334 {
1335 u32 fsidv[2];
1336
1337 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1338
1339 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1340 }
1341
1342 /*
1343 * Called when we need the filehandle for the root of the pseudofs,
1344 * for a given NFSv4 client. The root is defined to be the
1345 * export point with fsid==0
1346 */
1347 __be32
1348 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1349 {
1350 struct svc_export *exp;
1351 __be32 rv;
1352
1353 exp = find_fsidzero_export(rqstp);
1354 if (IS_ERR(exp))
1355 return nfserrno(PTR_ERR(exp));
1356 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1357 if (rv)
1358 goto out;
1359 rv = check_nfsd_access(exp, rqstp);
1360 if (rv)
1361 fh_put(fhp);
1362 out:
1363 exp_put(exp);
1364 return rv;
1365 }
1366
1367 /* Iterator */
1368
1369 static void *e_start(struct seq_file *m, loff_t *pos)
1370 __acquires(svc_export_cache.hash_lock)
1371 {
1372 loff_t n = *pos;
1373 unsigned hash, export;
1374 struct cache_head *ch;
1375
1376 exp_readlock();
1377 read_lock(&svc_export_cache.hash_lock);
1378 if (!n--)
1379 return SEQ_START_TOKEN;
1380 hash = n >> 32;
1381 export = n & ((1LL<<32) - 1);
1382
1383
1384 for (ch=export_table[hash]; ch; ch=ch->next)
1385 if (!export--)
1386 return ch;
1387 n &= ~((1LL<<32) - 1);
1388 do {
1389 hash++;
1390 n += 1LL<<32;
1391 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1392 if (hash >= EXPORT_HASHMAX)
1393 return NULL;
1394 *pos = n+1;
1395 return export_table[hash];
1396 }
1397
1398 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1399 {
1400 struct cache_head *ch = p;
1401 int hash = (*pos >> 32);
1402
1403 if (p == SEQ_START_TOKEN)
1404 hash = 0;
1405 else if (ch->next == NULL) {
1406 hash++;
1407 *pos += 1LL<<32;
1408 } else {
1409 ++*pos;
1410 return ch->next;
1411 }
1412 *pos &= ~((1LL<<32) - 1);
1413 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1414 hash++;
1415 *pos += 1LL<<32;
1416 }
1417 if (hash >= EXPORT_HASHMAX)
1418 return NULL;
1419 ++*pos;
1420 return export_table[hash];
1421 }
1422
1423 static void e_stop(struct seq_file *m, void *p)
1424 __releases(svc_export_cache.hash_lock)
1425 {
1426 read_unlock(&svc_export_cache.hash_lock);
1427 exp_readunlock();
1428 }
1429
1430 static struct flags {
1431 int flag;
1432 char *name[2];
1433 } expflags[] = {
1434 { NFSEXP_READONLY, {"ro", "rw"}},
1435 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1436 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1437 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1438 { NFSEXP_ASYNC, {"async", "sync"}},
1439 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1440 { NFSEXP_NOHIDE, {"nohide", ""}},
1441 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1442 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1443 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1444 { NFSEXP_V4ROOT, {"v4root", ""}},
1445 { 0, {"", ""}}
1446 };
1447
1448 static void show_expflags(struct seq_file *m, int flags, int mask)
1449 {
1450 struct flags *flg;
1451 int state, first = 0;
1452
1453 for (flg = expflags; flg->flag; flg++) {
1454 if (flg->flag & ~mask)
1455 continue;
1456 state = (flg->flag & flags) ? 0 : 1;
1457 if (*flg->name[state])
1458 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1459 }
1460 }
1461
1462 static void show_secinfo_flags(struct seq_file *m, int flags)
1463 {
1464 seq_printf(m, ",");
1465 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1466 }
1467
1468 static bool secinfo_flags_equal(int f, int g)
1469 {
1470 f &= NFSEXP_SECINFO_FLAGS;
1471 g &= NFSEXP_SECINFO_FLAGS;
1472 return f == g;
1473 }
1474
1475 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1476 {
1477 int flags;
1478
1479 flags = (*fp)->flags;
1480 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1481 (*fp)++;
1482 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1483 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1484 (*fp)++;
1485 }
1486 return flags;
1487 }
1488
1489 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1490 {
1491 struct exp_flavor_info *f;
1492 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1493 int flags;
1494
1495 if (exp->ex_nflavors == 0)
1496 return;
1497 f = exp->ex_flavors;
1498 flags = show_secinfo_run(m, &f, end);
1499 if (!secinfo_flags_equal(flags, exp->ex_flags))
1500 show_secinfo_flags(m, flags);
1501 while (f != end) {
1502 flags = show_secinfo_run(m, &f, end);
1503 show_secinfo_flags(m, flags);
1504 }
1505 }
1506
1507 static void exp_flags(struct seq_file *m, int flag, int fsid,
1508 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1509 {
1510 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1511 if (flag & NFSEXP_FSID)
1512 seq_printf(m, ",fsid=%d", fsid);
1513 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1514 seq_printf(m, ",anonuid=%u", anonu);
1515 if (anong != (gid_t)-2 && anong != (0x10000-2))
1516 seq_printf(m, ",anongid=%u", anong);
1517 if (fsloc && fsloc->locations_count > 0) {
1518 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1519 int i;
1520
1521 seq_printf(m, ",%s=", loctype);
1522 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1523 seq_putc(m, '@');
1524 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1525 for (i = 1; i < fsloc->locations_count; i++) {
1526 seq_putc(m, ';');
1527 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1528 seq_putc(m, '@');
1529 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1530 }
1531 }
1532 }
1533
1534 static int e_show(struct seq_file *m, void *p)
1535 {
1536 struct cache_head *cp = p;
1537 struct svc_export *exp = container_of(cp, struct svc_export, h);
1538
1539 if (p == SEQ_START_TOKEN) {
1540 seq_puts(m, "# Version 1.1\n");
1541 seq_puts(m, "# Path Client(Flags) # IPs\n");
1542 return 0;
1543 }
1544
1545 cache_get(&exp->h);
1546 if (cache_check(&svc_export_cache, &exp->h, NULL))
1547 return 0;
1548 cache_put(&exp->h, &svc_export_cache);
1549 return svc_export_show(m, &svc_export_cache, cp);
1550 }
1551
1552 const struct seq_operations nfs_exports_op = {
1553 .start = e_start,
1554 .next = e_next,
1555 .stop = e_stop,
1556 .show = e_show,
1557 };
1558
1559 #ifdef CONFIG_NFSD_DEPRECATED
1560 /*
1561 * Add or modify a client.
1562 * Change requests may involve the list of host addresses. The list of
1563 * exports and possibly existing uid maps are left untouched.
1564 */
1565 int
1566 exp_addclient(struct nfsctl_client *ncp)
1567 {
1568 struct auth_domain *dom;
1569 int i, err;
1570 struct in6_addr addr6;
1571
1572 /* First, consistency check. */
1573 err = -EINVAL;
1574 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1575 goto out;
1576 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1577 goto out;
1578
1579 /* Lock the hashtable */
1580 exp_writelock();
1581
1582 dom = unix_domain_find(ncp->cl_ident);
1583
1584 err = -ENOMEM;
1585 if (!dom)
1586 goto out_unlock;
1587
1588 /* Insert client into hashtable. */
1589 for (i = 0; i < ncp->cl_naddr; i++) {
1590 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1591 auth_unix_add_addr(&init_net, &addr6, dom);
1592 }
1593 auth_unix_forget_old(dom);
1594 auth_domain_put(dom);
1595
1596 err = 0;
1597
1598 out_unlock:
1599 exp_writeunlock();
1600 out:
1601 return err;
1602 }
1603
1604 /*
1605 * Delete a client given an identifier.
1606 */
1607 int
1608 exp_delclient(struct nfsctl_client *ncp)
1609 {
1610 int err;
1611 struct auth_domain *dom;
1612
1613 err = -EINVAL;
1614 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1615 goto out;
1616
1617 /* Lock the hashtable */
1618 exp_writelock();
1619
1620 dom = auth_domain_find(ncp->cl_ident);
1621 /* just make sure that no addresses work
1622 * and that it will expire soon
1623 */
1624 if (dom) {
1625 err = auth_unix_forget_old(dom);
1626 auth_domain_put(dom);
1627 }
1628
1629 exp_writeunlock();
1630 out:
1631 return err;
1632 }
1633
1634 /*
1635 * Verify that string is non-empty and does not exceed max length.
1636 */
1637 static int
1638 exp_verify_string(char *cp, int max)
1639 {
1640 int i;
1641
1642 for (i = 0; i < max; i++)
1643 if (!cp[i])
1644 return i;
1645 cp[i] = 0;
1646 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1647 return 0;
1648 }
1649 #endif /* CONFIG_NFSD_DEPRECATED */
1650
1651 /*
1652 * Initialize the exports module.
1653 */
1654 int
1655 nfsd_export_init(void)
1656 {
1657 int rv;
1658 dprintk("nfsd: initializing export module.\n");
1659
1660 rv = cache_register(&svc_export_cache);
1661 if (rv)
1662 return rv;
1663 rv = cache_register(&svc_expkey_cache);
1664 if (rv)
1665 cache_unregister(&svc_export_cache);
1666 return rv;
1667
1668 }
1669
1670 /*
1671 * Flush exports table - called when last nfsd thread is killed
1672 */
1673 void
1674 nfsd_export_flush(void)
1675 {
1676 exp_writelock();
1677 cache_purge(&svc_expkey_cache);
1678 cache_purge(&svc_export_cache);
1679 exp_writeunlock();
1680 }
1681
1682 /*
1683 * Shutdown the exports module.
1684 */
1685 void
1686 nfsd_export_shutdown(void)
1687 {
1688
1689 dprintk("nfsd: shutting down export module.\n");
1690
1691 exp_writelock();
1692
1693 cache_unregister(&svc_expkey_cache);
1694 cache_unregister(&svc_export_cache);
1695 svcauth_unix_purge();
1696
1697 exp_writeunlock();
1698 dprintk("nfsd: export shutdown complete.\n");
1699 }
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