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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 | ||
39 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT | |
40 | ||
41 | typedef struct auth_domain svc_client; | |
42 | typedef struct svc_export svc_export; | |
43 | ||
44 | static void exp_do_unexport(svc_export *unexp); | |
45 | static int exp_verify_string(char *cp, int max); | |
46 | ||
47 | /* | |
48 | * We have two caches. | |
49 | * One maps client+vfsmnt+dentry to export options - the export map | |
50 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
51 | * | |
52 | * The export options are actually stored in the first map, and the | |
53 | * second map contains a reference to the entry in the first map. | |
54 | */ | |
55 | ||
56 | #define EXPKEY_HASHBITS 8 | |
57 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
58 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
59 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
60 | ||
61 | static void expkey_put(struct kref *ref) | |
62 | { | |
63 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); | |
64 | ||
65 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
66 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { | |
67 | dput(key->ek_dentry); | |
68 | mntput(key->ek_mnt); | |
69 | } | |
70 | auth_domain_put(key->ek_client); | |
71 | kfree(key); | |
72 | } | |
73 | ||
74 | static void expkey_request(struct cache_detail *cd, | |
75 | struct cache_head *h, | |
76 | char **bpp, int *blen) | |
77 | { | |
78 | /* client fsidtype \xfsid */ | |
79 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
80 | char type[5]; | |
81 | ||
82 | qword_add(bpp, blen, ek->ek_client->name); | |
83 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
84 | qword_add(bpp, blen, type); | |
85 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
86 | (*bpp)[-1] = '\n'; | |
87 | } | |
88 | ||
89 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); | |
90 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
91 | static struct cache_detail svc_expkey_cache; | |
92 | ||
93 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) | |
94 | { | |
95 | /* client fsidtype fsid [path] */ | |
96 | char *buf; | |
97 | int len; | |
98 | struct auth_domain *dom = NULL; | |
99 | int err; | |
100 | int fsidtype; | |
101 | char *ep; | |
102 | struct svc_expkey key; | |
103 | struct svc_expkey *ek; | |
104 | ||
105 | if (mesg[mlen-1] != '\n') | |
106 | return -EINVAL; | |
107 | mesg[mlen-1] = 0; | |
108 | ||
109 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
110 | err = -ENOMEM; | |
111 | if (!buf) 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 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) | |
156 | goto out; | |
157 | dprintk("Path seems to be <%s>\n", buf); | |
158 | err = 0; | |
159 | if (len == 0) { | |
160 | set_bit(CACHE_NEGATIVE, &key.h.flags); | |
161 | ek = svc_expkey_update(&key, ek); | |
162 | if (ek) | |
163 | cache_put(&ek->h, &svc_expkey_cache); | |
164 | else err = -ENOMEM; | |
165 | } else { | |
166 | struct nameidata nd; | |
167 | err = path_lookup(buf, 0, &nd); | |
168 | if (err) | |
169 | goto out; | |
170 | ||
171 | dprintk("Found the path %s\n", buf); | |
172 | key.ek_mnt = nd.path.mnt; | |
173 | key.ek_dentry = nd.path.dentry; | |
174 | ||
175 | ek = svc_expkey_update(&key, ek); | |
176 | if (ek) | |
177 | cache_put(&ek->h, &svc_expkey_cache); | |
178 | else | |
179 | err = -ENOMEM; | |
180 | path_release(&nd); | |
181 | } | |
182 | cache_flush(); | |
183 | out: | |
184 | if (dom) | |
185 | auth_domain_put(dom); | |
186 | kfree(buf); | |
187 | return err; | |
188 | } | |
189 | ||
190 | static int expkey_show(struct seq_file *m, | |
191 | struct cache_detail *cd, | |
192 | struct cache_head *h) | |
193 | { | |
194 | struct svc_expkey *ek ; | |
195 | int i; | |
196 | ||
197 | if (h ==NULL) { | |
198 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
199 | return 0; | |
200 | } | |
201 | ek = container_of(h, struct svc_expkey, h); | |
202 | seq_printf(m, "%s %d 0x", ek->ek_client->name, | |
203 | ek->ek_fsidtype); | |
204 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
205 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
206 | if (test_bit(CACHE_VALID, &h->flags) && | |
207 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
208 | seq_printf(m, " "); | |
209 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); | |
210 | } | |
211 | seq_printf(m, "\n"); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) | |
216 | { | |
217 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); | |
218 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
219 | ||
220 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
221 | orig->ek_client != new->ek_client || | |
222 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
223 | return 0; | |
224 | return 1; | |
225 | } | |
226 | ||
227 | static inline void expkey_init(struct cache_head *cnew, | |
228 | struct cache_head *citem) | |
229 | { | |
230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); | |
231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
232 | ||
233 | kref_get(&item->ek_client->ref); | |
234 | new->ek_client = item->ek_client; | |
235 | new->ek_fsidtype = item->ek_fsidtype; | |
236 | ||
237 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
238 | } | |
239 | ||
240 | static inline void expkey_update(struct cache_head *cnew, | |
241 | struct cache_head *citem) | |
242 | { | |
243 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); | |
244 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
245 | ||
246 | new->ek_mnt = mntget(item->ek_mnt); | |
247 | new->ek_dentry = dget(item->ek_dentry); | |
248 | } | |
249 | ||
250 | static struct cache_head *expkey_alloc(void) | |
251 | { | |
252 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
253 | if (i) | |
254 | return &i->h; | |
255 | else | |
256 | return NULL; | |
257 | } | |
258 | ||
259 | static struct cache_detail svc_expkey_cache = { | |
260 | .owner = THIS_MODULE, | |
261 | .hash_size = EXPKEY_HASHMAX, | |
262 | .hash_table = expkey_table, | |
263 | .name = "nfsd.fh", | |
264 | .cache_put = expkey_put, | |
265 | .cache_request = expkey_request, | |
266 | .cache_parse = expkey_parse, | |
267 | .cache_show = expkey_show, | |
268 | .match = expkey_match, | |
269 | .init = expkey_init, | |
270 | .update = expkey_update, | |
271 | .alloc = expkey_alloc, | |
272 | }; | |
273 | ||
274 | static struct svc_expkey * | |
275 | svc_expkey_lookup(struct svc_expkey *item) | |
276 | { | |
277 | struct cache_head *ch; | |
278 | int hash = item->ek_fsidtype; | |
279 | char * cp = (char*)item->ek_fsid; | |
280 | int len = key_len(item->ek_fsidtype); | |
281 | ||
282 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
283 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
284 | hash &= EXPKEY_HASHMASK; | |
285 | ||
286 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
287 | hash); | |
288 | if (ch) | |
289 | return container_of(ch, struct svc_expkey, h); | |
290 | else | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static struct svc_expkey * | |
295 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
296 | { | |
297 | struct cache_head *ch; | |
298 | int hash = new->ek_fsidtype; | |
299 | char * cp = (char*)new->ek_fsid; | |
300 | int len = key_len(new->ek_fsidtype); | |
301 | ||
302 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
303 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
304 | hash &= EXPKEY_HASHMASK; | |
305 | ||
306 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
307 | &old->h, hash); | |
308 | if (ch) | |
309 | return container_of(ch, struct svc_expkey, h); | |
310 | else | |
311 | return NULL; | |
312 | } | |
313 | ||
314 | ||
315 | #define EXPORT_HASHBITS 8 | |
316 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
317 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
318 | ||
319 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
320 | ||
321 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) | |
322 | { | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < fsloc->locations_count; i++) { | |
326 | kfree(fsloc->locations[i].path); | |
327 | kfree(fsloc->locations[i].hosts); | |
328 | } | |
329 | kfree(fsloc->locations); | |
330 | } | |
331 | ||
332 | static void svc_export_put(struct kref *ref) | |
333 | { | |
334 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); | |
335 | dput(exp->ex_dentry); | |
336 | mntput(exp->ex_mnt); | |
337 | auth_domain_put(exp->ex_client); | |
338 | kfree(exp->ex_path); | |
339 | nfsd4_fslocs_free(&exp->ex_fslocs); | |
340 | kfree(exp); | |
341 | } | |
342 | ||
343 | static void svc_export_request(struct cache_detail *cd, | |
344 | struct cache_head *h, | |
345 | char **bpp, int *blen) | |
346 | { | |
347 | /* client path */ | |
348 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
349 | char *pth; | |
350 | ||
351 | qword_add(bpp, blen, exp->ex_client->name); | |
352 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
353 | if (IS_ERR(pth)) { | |
354 | /* is this correct? */ | |
355 | (*bpp)[0] = '\n'; | |
356 | return; | |
357 | } | |
358 | qword_add(bpp, blen, pth); | |
359 | (*bpp)[-1] = '\n'; | |
360 | } | |
361 | ||
362 | static struct svc_export *svc_export_update(struct svc_export *new, | |
363 | struct svc_export *old); | |
364 | static struct svc_export *svc_export_lookup(struct svc_export *); | |
365 | ||
366 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) | |
367 | { | |
368 | ||
369 | /* We currently export only dirs and regular files. | |
370 | * This is what umountd does. | |
371 | */ | |
372 | if (!S_ISDIR(inode->i_mode) && | |
373 | !S_ISREG(inode->i_mode)) | |
374 | return -ENOTDIR; | |
375 | ||
376 | /* There are two requirements on a filesystem to be exportable. | |
377 | * 1: We must be able to identify the filesystem from a number. | |
378 | * either a device number (so FS_REQUIRES_DEV needed) | |
379 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). | |
380 | * 2: We must be able to find an inode from a filehandle. | |
381 | * This means that s_export_op must be set. | |
382 | */ | |
383 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
384 | !(flags & NFSEXP_FSID) && | |
385 | uuid == NULL) { | |
386 | dprintk("exp_export: export of non-dev fs without fsid\n"); | |
387 | return -EINVAL; | |
388 | } | |
389 | ||
390 | if (!inode->i_sb->s_export_op || | |
391 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
392 | dprintk("exp_export: export of invalid fs type.\n"); | |
393 | return -EINVAL; | |
394 | } | |
395 | ||
396 | return 0; | |
397 | ||
398 | } | |
399 | ||
400 | #ifdef CONFIG_NFSD_V4 | |
401 | ||
402 | static int | |
403 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
404 | { | |
405 | int len; | |
406 | int migrated, i, err; | |
407 | ||
408 | /* listsize */ | |
409 | err = get_int(mesg, &fsloc->locations_count); | |
410 | if (err) | |
411 | return err; | |
412 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
413 | return -EINVAL; | |
414 | if (fsloc->locations_count == 0) | |
415 | return 0; | |
416 | ||
417 | fsloc->locations = kzalloc(fsloc->locations_count | |
418 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
419 | if (!fsloc->locations) | |
420 | return -ENOMEM; | |
421 | for (i=0; i < fsloc->locations_count; i++) { | |
422 | /* colon separated host list */ | |
423 | err = -EINVAL; | |
424 | len = qword_get(mesg, buf, PAGE_SIZE); | |
425 | if (len <= 0) | |
426 | goto out_free_all; | |
427 | err = -ENOMEM; | |
428 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
429 | if (!fsloc->locations[i].hosts) | |
430 | goto out_free_all; | |
431 | err = -EINVAL; | |
432 | /* slash separated path component list */ | |
433 | len = qword_get(mesg, buf, PAGE_SIZE); | |
434 | if (len <= 0) | |
435 | goto out_free_all; | |
436 | err = -ENOMEM; | |
437 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
438 | if (!fsloc->locations[i].path) | |
439 | goto out_free_all; | |
440 | } | |
441 | /* migrated */ | |
442 | err = get_int(mesg, &migrated); | |
443 | if (err) | |
444 | goto out_free_all; | |
445 | err = -EINVAL; | |
446 | if (migrated < 0 || migrated > 1) | |
447 | goto out_free_all; | |
448 | fsloc->migrated = migrated; | |
449 | return 0; | |
450 | out_free_all: | |
451 | nfsd4_fslocs_free(fsloc); | |
452 | return err; | |
453 | } | |
454 | ||
455 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) | |
456 | { | |
457 | int listsize, err; | |
458 | struct exp_flavor_info *f; | |
459 | ||
460 | err = get_int(mesg, &listsize); | |
461 | if (err) | |
462 | return err; | |
463 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
464 | return -EINVAL; | |
465 | ||
466 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
467 | err = get_int(mesg, &f->pseudoflavor); | |
468 | if (err) | |
469 | return err; | |
470 | /* | |
471 | * Just a quick sanity check; we could also try to check | |
472 | * whether this pseudoflavor is supported, but at worst | |
473 | * an unsupported pseudoflavor on the export would just | |
474 | * be a pseudoflavor that won't match the flavor of any | |
475 | * authenticated request. The administrator will | |
476 | * probably discover the problem when someone fails to | |
477 | * authenticate. | |
478 | */ | |
479 | if (f->pseudoflavor < 0) | |
480 | return -EINVAL; | |
481 | err = get_int(mesg, &f->flags); | |
482 | if (err) | |
483 | return err; | |
484 | /* Only some flags are allowed to differ between flavors: */ | |
485 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
486 | return -EINVAL; | |
487 | } | |
488 | exp->ex_nflavors = listsize; | |
489 | return 0; | |
490 | } | |
491 | ||
492 | #else /* CONFIG_NFSD_V4 */ | |
493 | static inline int | |
494 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
495 | static inline int | |
496 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
497 | #endif | |
498 | ||
499 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) | |
500 | { | |
501 | /* client path expiry [flags anonuid anongid fsid] */ | |
502 | char *buf; | |
503 | int len; | |
504 | int err; | |
505 | struct auth_domain *dom = NULL; | |
506 | struct nameidata nd; | |
507 | struct svc_export exp, *expp; | |
508 | int an_int; | |
509 | ||
510 | nd.path.dentry = NULL; | |
511 | exp.ex_path = NULL; | |
512 | ||
513 | /* fs locations */ | |
514 | exp.ex_fslocs.locations = NULL; | |
515 | exp.ex_fslocs.locations_count = 0; | |
516 | exp.ex_fslocs.migrated = 0; | |
517 | ||
518 | exp.ex_uuid = NULL; | |
519 | ||
520 | /* secinfo */ | |
521 | exp.ex_nflavors = 0; | |
522 | ||
523 | if (mesg[mlen-1] != '\n') | |
524 | return -EINVAL; | |
525 | mesg[mlen-1] = 0; | |
526 | ||
527 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
528 | err = -ENOMEM; | |
529 | if (!buf) goto out; | |
530 | ||
531 | /* client */ | |
532 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
533 | err = -EINVAL; | |
534 | if (len <= 0) goto out; | |
535 | ||
536 | err = -ENOENT; | |
537 | dom = auth_domain_find(buf); | |
538 | if (!dom) | |
539 | goto out; | |
540 | ||
541 | /* path */ | |
542 | err = -EINVAL; | |
543 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
544 | goto out; | |
545 | err = path_lookup(buf, 0, &nd); | |
546 | if (err) goto out_no_path; | |
547 | ||
548 | exp.h.flags = 0; | |
549 | exp.ex_client = dom; | |
550 | exp.ex_mnt = nd.path.mnt; | |
551 | exp.ex_dentry = nd.path.dentry; | |
552 | exp.ex_path = kstrdup(buf, GFP_KERNEL); | |
553 | err = -ENOMEM; | |
554 | if (!exp.ex_path) | |
555 | goto out; | |
556 | ||
557 | /* expiry */ | |
558 | err = -EINVAL; | |
559 | exp.h.expiry_time = get_expiry(&mesg); | |
560 | if (exp.h.expiry_time == 0) | |
561 | goto out; | |
562 | ||
563 | /* flags */ | |
564 | err = get_int(&mesg, &an_int); | |
565 | if (err == -ENOENT) { | |
566 | err = 0; | |
567 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
568 | } else { | |
569 | if (err || an_int < 0) goto out; | |
570 | exp.ex_flags= an_int; | |
571 | ||
572 | /* anon uid */ | |
573 | err = get_int(&mesg, &an_int); | |
574 | if (err) goto out; | |
575 | exp.ex_anon_uid= an_int; | |
576 | ||
577 | /* anon gid */ | |
578 | err = get_int(&mesg, &an_int); | |
579 | if (err) goto out; | |
580 | exp.ex_anon_gid= an_int; | |
581 | ||
582 | /* fsid */ | |
583 | err = get_int(&mesg, &an_int); | |
584 | if (err) goto out; | |
585 | exp.ex_fsid = an_int; | |
586 | ||
587 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { | |
588 | if (strcmp(buf, "fsloc") == 0) | |
589 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
590 | else if (strcmp(buf, "uuid") == 0) { | |
591 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
592 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
593 | if (len != 16) | |
594 | err = -EINVAL; | |
595 | else { | |
596 | exp.ex_uuid = | |
597 | kmemdup(buf, 16, GFP_KERNEL); | |
598 | if (exp.ex_uuid == NULL) | |
599 | err = -ENOMEM; | |
600 | } | |
601 | } else if (strcmp(buf, "secinfo") == 0) | |
602 | err = secinfo_parse(&mesg, buf, &exp); | |
603 | else | |
604 | /* quietly ignore unknown words and anything | |
605 | * following. Newer user-space can try to set | |
606 | * new values, then see what the result was. | |
607 | */ | |
608 | break; | |
609 | if (err) | |
610 | goto out; | |
611 | } | |
612 | ||
613 | err = check_export(nd.path.dentry->d_inode, exp.ex_flags, | |
614 | exp.ex_uuid); | |
615 | if (err) goto out; | |
616 | } | |
617 | ||
618 | expp = svc_export_lookup(&exp); | |
619 | if (expp) | |
620 | expp = svc_export_update(&exp, expp); | |
621 | else | |
622 | err = -ENOMEM; | |
623 | cache_flush(); | |
624 | if (expp == NULL) | |
625 | err = -ENOMEM; | |
626 | else | |
627 | exp_put(expp); | |
628 | out: | |
629 | nfsd4_fslocs_free(&exp.ex_fslocs); | |
630 | kfree(exp.ex_uuid); | |
631 | kfree(exp.ex_path); | |
632 | if (nd.path.dentry) | |
633 | path_release(&nd); | |
634 | out_no_path: | |
635 | if (dom) | |
636 | auth_domain_put(dom); | |
637 | kfree(buf); | |
638 | return err; | |
639 | } | |
640 | ||
641 | static void exp_flags(struct seq_file *m, int flag, int fsid, | |
642 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
643 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); | |
644 | ||
645 | static int svc_export_show(struct seq_file *m, | |
646 | struct cache_detail *cd, | |
647 | struct cache_head *h) | |
648 | { | |
649 | struct svc_export *exp ; | |
650 | ||
651 | if (h ==NULL) { | |
652 | seq_puts(m, "#path domain(flags)\n"); | |
653 | return 0; | |
654 | } | |
655 | exp = container_of(h, struct svc_export, h); | |
656 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
657 | seq_putc(m, '\t'); | |
658 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
659 | seq_putc(m, '('); | |
660 | if (test_bit(CACHE_VALID, &h->flags) && | |
661 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
662 | exp_flags(m, exp->ex_flags, exp->ex_fsid, | |
663 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
664 | if (exp->ex_uuid) { | |
665 | int i; | |
666 | seq_puts(m, ",uuid="); | |
667 | for (i=0; i<16; i++) { | |
668 | if ((i&3) == 0 && i) | |
669 | seq_putc(m, ':'); | |
670 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
671 | } | |
672 | } | |
673 | show_secinfo(m, exp); | |
674 | } | |
675 | seq_puts(m, ")\n"); | |
676 | return 0; | |
677 | } | |
678 | static int svc_export_match(struct cache_head *a, struct cache_head *b) | |
679 | { | |
680 | struct svc_export *orig = container_of(a, struct svc_export, h); | |
681 | struct svc_export *new = container_of(b, struct svc_export, h); | |
682 | return orig->ex_client == new->ex_client && | |
683 | orig->ex_dentry == new->ex_dentry && | |
684 | orig->ex_mnt == new->ex_mnt; | |
685 | } | |
686 | ||
687 | static void svc_export_init(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 | ||
692 | kref_get(&item->ex_client->ref); | |
693 | new->ex_client = item->ex_client; | |
694 | new->ex_dentry = dget(item->ex_dentry); | |
695 | new->ex_mnt = mntget(item->ex_mnt); | |
696 | new->ex_path = NULL; | |
697 | new->ex_fslocs.locations = NULL; | |
698 | new->ex_fslocs.locations_count = 0; | |
699 | new->ex_fslocs.migrated = 0; | |
700 | } | |
701 | ||
702 | static void export_update(struct cache_head *cnew, struct cache_head *citem) | |
703 | { | |
704 | struct svc_export *new = container_of(cnew, struct svc_export, h); | |
705 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
706 | int i; | |
707 | ||
708 | new->ex_flags = item->ex_flags; | |
709 | new->ex_anon_uid = item->ex_anon_uid; | |
710 | new->ex_anon_gid = item->ex_anon_gid; | |
711 | new->ex_fsid = item->ex_fsid; | |
712 | new->ex_uuid = item->ex_uuid; | |
713 | item->ex_uuid = NULL; | |
714 | new->ex_path = item->ex_path; | |
715 | item->ex_path = NULL; | |
716 | new->ex_fslocs.locations = item->ex_fslocs.locations; | |
717 | item->ex_fslocs.locations = NULL; | |
718 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
719 | item->ex_fslocs.locations_count = 0; | |
720 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
721 | item->ex_fslocs.migrated = 0; | |
722 | new->ex_nflavors = item->ex_nflavors; | |
723 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
724 | new->ex_flavors[i] = item->ex_flavors[i]; | |
725 | } | |
726 | } | |
727 | ||
728 | static struct cache_head *svc_export_alloc(void) | |
729 | { | |
730 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
731 | if (i) | |
732 | return &i->h; | |
733 | else | |
734 | return NULL; | |
735 | } | |
736 | ||
737 | struct cache_detail svc_export_cache = { | |
738 | .owner = THIS_MODULE, | |
739 | .hash_size = EXPORT_HASHMAX, | |
740 | .hash_table = export_table, | |
741 | .name = "nfsd.export", | |
742 | .cache_put = svc_export_put, | |
743 | .cache_request = svc_export_request, | |
744 | .cache_parse = svc_export_parse, | |
745 | .cache_show = svc_export_show, | |
746 | .match = svc_export_match, | |
747 | .init = svc_export_init, | |
748 | .update = export_update, | |
749 | .alloc = svc_export_alloc, | |
750 | }; | |
751 | ||
752 | static struct svc_export * | |
753 | svc_export_lookup(struct svc_export *exp) | |
754 | { | |
755 | struct cache_head *ch; | |
756 | int hash; | |
757 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
758 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
759 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
760 | ||
761 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
762 | hash); | |
763 | if (ch) | |
764 | return container_of(ch, struct svc_export, h); | |
765 | else | |
766 | return NULL; | |
767 | } | |
768 | ||
769 | static struct svc_export * | |
770 | svc_export_update(struct svc_export *new, struct svc_export *old) | |
771 | { | |
772 | struct cache_head *ch; | |
773 | int hash; | |
774 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
775 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
776 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
777 | ||
778 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
779 | &old->h, | |
780 | hash); | |
781 | if (ch) | |
782 | return container_of(ch, struct svc_export, h); | |
783 | else | |
784 | return NULL; | |
785 | } | |
786 | ||
787 | ||
788 | static struct svc_expkey * | |
789 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) | |
790 | { | |
791 | struct svc_expkey key, *ek; | |
792 | int err; | |
793 | ||
794 | if (!clp) | |
795 | return ERR_PTR(-ENOENT); | |
796 | ||
797 | key.ek_client = clp; | |
798 | key.ek_fsidtype = fsid_type; | |
799 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
800 | ||
801 | ek = svc_expkey_lookup(&key); | |
802 | if (ek == NULL) | |
803 | return ERR_PTR(-ENOMEM); | |
804 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
805 | if (err) | |
806 | return ERR_PTR(err); | |
807 | return ek; | |
808 | } | |
809 | ||
810 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
811 | struct svc_export *exp) | |
812 | { | |
813 | struct svc_expkey key, *ek; | |
814 | ||
815 | key.ek_client = clp; | |
816 | key.ek_fsidtype = fsid_type; | |
817 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
818 | key.ek_mnt = exp->ex_mnt; | |
819 | key.ek_dentry = exp->ex_dentry; | |
820 | key.h.expiry_time = NEVER; | |
821 | key.h.flags = 0; | |
822 | ||
823 | ek = svc_expkey_lookup(&key); | |
824 | if (ek) | |
825 | ek = svc_expkey_update(&key,ek); | |
826 | if (ek) { | |
827 | cache_put(&ek->h, &svc_expkey_cache); | |
828 | return 0; | |
829 | } | |
830 | return -ENOMEM; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Find the client's export entry matching xdev/xino. | |
835 | */ | |
836 | static inline struct svc_expkey * | |
837 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
838 | { | |
839 | u32 fsidv[3]; | |
840 | ||
841 | if (old_valid_dev(dev)) { | |
842 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); | |
843 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
844 | } | |
845 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); | |
846 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Find the client's export entry matching fsid | |
851 | */ | |
852 | static inline struct svc_expkey * | |
853 | exp_get_fsid_key(svc_client *clp, int fsid) | |
854 | { | |
855 | u32 fsidv[2]; | |
856 | ||
857 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); | |
858 | ||
859 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); | |
860 | } | |
861 | ||
862 | static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt, | |
863 | struct dentry *dentry, | |
864 | struct cache_req *reqp) | |
865 | { | |
866 | struct svc_export *exp, key; | |
867 | int err; | |
868 | ||
869 | if (!clp) | |
870 | return ERR_PTR(-ENOENT); | |
871 | ||
872 | key.ex_client = clp; | |
873 | key.ex_mnt = mnt; | |
874 | key.ex_dentry = dentry; | |
875 | ||
876 | exp = svc_export_lookup(&key); | |
877 | if (exp == NULL) | |
878 | return ERR_PTR(-ENOMEM); | |
879 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
880 | if (err) | |
881 | return ERR_PTR(err); | |
882 | return exp; | |
883 | } | |
884 | ||
885 | /* | |
886 | * Find the export entry for a given dentry. | |
887 | */ | |
888 | static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt, | |
889 | struct dentry *dentry, | |
890 | struct cache_req *reqp) | |
891 | { | |
892 | svc_export *exp; | |
893 | ||
894 | dget(dentry); | |
895 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
896 | ||
897 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { | |
898 | struct dentry *parent; | |
899 | ||
900 | parent = dget_parent(dentry); | |
901 | dput(dentry); | |
902 | dentry = parent; | |
903 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
904 | } | |
905 | dput(dentry); | |
906 | return exp; | |
907 | } | |
908 | ||
909 | /* | |
910 | * Hashtable locking. Write locks are placed only by user processes | |
911 | * wanting to modify export information. | |
912 | * Write locking only done in this file. Read locking | |
913 | * needed externally. | |
914 | */ | |
915 | ||
916 | static DECLARE_RWSEM(hash_sem); | |
917 | ||
918 | void | |
919 | exp_readlock(void) | |
920 | { | |
921 | down_read(&hash_sem); | |
922 | } | |
923 | ||
924 | static inline void | |
925 | exp_writelock(void) | |
926 | { | |
927 | down_write(&hash_sem); | |
928 | } | |
929 | ||
930 | void | |
931 | exp_readunlock(void) | |
932 | { | |
933 | up_read(&hash_sem); | |
934 | } | |
935 | ||
936 | static inline void | |
937 | exp_writeunlock(void) | |
938 | { | |
939 | up_write(&hash_sem); | |
940 | } | |
941 | ||
942 | static void exp_fsid_unhash(struct svc_export *exp) | |
943 | { | |
944 | struct svc_expkey *ek; | |
945 | ||
946 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
947 | return; | |
948 | ||
949 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
950 | if (!IS_ERR(ek)) { | |
951 | ek->h.expiry_time = get_seconds()-1; | |
952 | cache_put(&ek->h, &svc_expkey_cache); | |
953 | } | |
954 | svc_expkey_cache.nextcheck = get_seconds(); | |
955 | } | |
956 | ||
957 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
958 | { | |
959 | u32 fsid[2]; | |
960 | ||
961 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
962 | return 0; | |
963 | ||
964 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); | |
965 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
966 | } | |
967 | ||
968 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
969 | { | |
970 | u32 fsid[2]; | |
971 | struct inode *inode = exp->ex_dentry->d_inode; | |
972 | dev_t dev = inode->i_sb->s_dev; | |
973 | ||
974 | if (old_valid_dev(dev)) { | |
975 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); | |
976 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
977 | } | |
978 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); | |
979 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
980 | } | |
981 | ||
982 | static void exp_unhash(struct svc_export *exp) | |
983 | { | |
984 | struct svc_expkey *ek; | |
985 | struct inode *inode = exp->ex_dentry->d_inode; | |
986 | ||
987 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
988 | if (!IS_ERR(ek)) { | |
989 | ek->h.expiry_time = get_seconds()-1; | |
990 | cache_put(&ek->h, &svc_expkey_cache); | |
991 | } | |
992 | svc_expkey_cache.nextcheck = get_seconds(); | |
993 | } | |
994 | ||
995 | /* | |
996 | * Export a file system. | |
997 | */ | |
998 | int | |
999 | exp_export(struct nfsctl_export *nxp) | |
1000 | { | |
1001 | svc_client *clp; | |
1002 | struct svc_export *exp = NULL; | |
1003 | struct svc_export new; | |
1004 | struct svc_expkey *fsid_key = NULL; | |
1005 | struct nameidata nd; | |
1006 | int err; | |
1007 | ||
1008 | /* Consistency check */ | |
1009 | err = -EINVAL; | |
1010 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1011 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1012 | goto out; | |
1013 | ||
1014 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
1015 | nxp->ex_client, nxp->ex_path, | |
1016 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
1017 | nxp->ex_flags); | |
1018 | ||
1019 | /* Try to lock the export table for update */ | |
1020 | exp_writelock(); | |
1021 | ||
1022 | /* Look up client info */ | |
1023 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
1024 | goto out_unlock; | |
1025 | ||
1026 | ||
1027 | /* Look up the dentry */ | |
1028 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1029 | if (err) | |
1030 | goto out_unlock; | |
1031 | err = -EINVAL; | |
1032 | ||
1033 | exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL); | |
1034 | ||
1035 | memset(&new, 0, sizeof(new)); | |
1036 | ||
1037 | /* must make sure there won't be an ex_fsid clash */ | |
1038 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
1039 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && | |
1040 | fsid_key->ek_mnt && | |
1041 | (fsid_key->ek_mnt != nd.path.mnt || | |
1042 | fsid_key->ek_dentry != nd.path.dentry)) | |
1043 | goto finish; | |
1044 | ||
1045 | if (!IS_ERR(exp)) { | |
1046 | /* just a flags/id/fsid update */ | |
1047 | ||
1048 | exp_fsid_unhash(exp); | |
1049 | exp->ex_flags = nxp->ex_flags; | |
1050 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1051 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1052 | exp->ex_fsid = nxp->ex_dev; | |
1053 | ||
1054 | err = exp_fsid_hash(clp, exp); | |
1055 | goto finish; | |
1056 | } | |
1057 | ||
1058 | err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL); | |
1059 | if (err) goto finish; | |
1060 | ||
1061 | err = -ENOMEM; | |
1062 | ||
1063 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1064 | ||
1065 | new.h.expiry_time = NEVER; | |
1066 | new.h.flags = 0; | |
1067 | new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL); | |
1068 | if (!new.ex_path) | |
1069 | goto finish; | |
1070 | new.ex_client = clp; | |
1071 | new.ex_mnt = nd.path.mnt; | |
1072 | new.ex_dentry = nd.path.dentry; | |
1073 | new.ex_flags = nxp->ex_flags; | |
1074 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1075 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1076 | new.ex_fsid = nxp->ex_dev; | |
1077 | ||
1078 | exp = svc_export_lookup(&new); | |
1079 | if (exp) | |
1080 | exp = svc_export_update(&new, exp); | |
1081 | ||
1082 | if (!exp) | |
1083 | goto finish; | |
1084 | ||
1085 | if (exp_hash(clp, exp) || | |
1086 | exp_fsid_hash(clp, exp)) { | |
1087 | /* failed to create at least one index */ | |
1088 | exp_do_unexport(exp); | |
1089 | cache_flush(); | |
1090 | } else | |
1091 | err = 0; | |
1092 | finish: | |
1093 | if (new.ex_path) | |
1094 | kfree(new.ex_path); | |
1095 | if (exp) | |
1096 | exp_put(exp); | |
1097 | if (fsid_key && !IS_ERR(fsid_key)) | |
1098 | cache_put(&fsid_key->h, &svc_expkey_cache); | |
1099 | if (clp) | |
1100 | auth_domain_put(clp); | |
1101 | path_release(&nd); | |
1102 | out_unlock: | |
1103 | exp_writeunlock(); | |
1104 | out: | |
1105 | return err; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Unexport a file system. The export entry has already | |
1110 | * been removed from the client's list of exported fs's. | |
1111 | */ | |
1112 | static void | |
1113 | exp_do_unexport(svc_export *unexp) | |
1114 | { | |
1115 | unexp->h.expiry_time = get_seconds()-1; | |
1116 | svc_export_cache.nextcheck = get_seconds(); | |
1117 | exp_unhash(unexp); | |
1118 | exp_fsid_unhash(unexp); | |
1119 | } | |
1120 | ||
1121 | ||
1122 | /* | |
1123 | * unexport syscall. | |
1124 | */ | |
1125 | int | |
1126 | exp_unexport(struct nfsctl_export *nxp) | |
1127 | { | |
1128 | struct auth_domain *dom; | |
1129 | svc_export *exp; | |
1130 | struct nameidata nd; | |
1131 | int err; | |
1132 | ||
1133 | /* Consistency check */ | |
1134 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1135 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1136 | return -EINVAL; | |
1137 | ||
1138 | exp_writelock(); | |
1139 | ||
1140 | err = -EINVAL; | |
1141 | dom = auth_domain_find(nxp->ex_client); | |
1142 | if (!dom) { | |
1143 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1144 | goto out_unlock; | |
1145 | } | |
1146 | ||
1147 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1148 | if (err) | |
1149 | goto out_domain; | |
1150 | ||
1151 | err = -EINVAL; | |
1152 | exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL); | |
1153 | path_release(&nd); | |
1154 | if (IS_ERR(exp)) | |
1155 | goto out_domain; | |
1156 | ||
1157 | exp_do_unexport(exp); | |
1158 | exp_put(exp); | |
1159 | err = 0; | |
1160 | ||
1161 | out_domain: | |
1162 | auth_domain_put(dom); | |
1163 | cache_flush(); | |
1164 | out_unlock: | |
1165 | exp_writeunlock(); | |
1166 | return err; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * Obtain the root fh on behalf of a client. | |
1171 | * This could be done in user space, but I feel that it adds some safety | |
1172 | * since its harder to fool a kernel module than a user space program. | |
1173 | */ | |
1174 | int | |
1175 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
1176 | { | |
1177 | struct svc_export *exp; | |
1178 | struct nameidata nd; | |
1179 | struct inode *inode; | |
1180 | struct svc_fh fh; | |
1181 | int err; | |
1182 | ||
1183 | err = -EPERM; | |
1184 | /* NB: we probably ought to check that it's NUL-terminated */ | |
1185 | if (path_lookup(path, 0, &nd)) { | |
1186 | printk("nfsd: exp_rootfh path not found %s", path); | |
1187 | return err; | |
1188 | } | |
1189 | inode = nd.path.dentry->d_inode; | |
1190 | ||
1191 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
1192 | path, nd.path.dentry, clp->name, | |
1193 | inode->i_sb->s_id, inode->i_ino); | |
1194 | exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL); | |
1195 | if (IS_ERR(exp)) { | |
1196 | err = PTR_ERR(exp); | |
1197 | goto out; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * fh must be initialized before calling fh_compose | |
1202 | */ | |
1203 | fh_init(&fh, maxsize); | |
1204 | if (fh_compose(&fh, exp, nd.path.dentry, NULL)) | |
1205 | err = -EINVAL; | |
1206 | else | |
1207 | err = 0; | |
1208 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1209 | fh_put(&fh); | |
1210 | exp_put(exp); | |
1211 | out: | |
1212 | path_release(&nd); | |
1213 | return err; | |
1214 | } | |
1215 | ||
1216 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, | |
1217 | u32 *fsidv, struct cache_req *reqp) | |
1218 | { | |
1219 | struct svc_export *exp; | |
1220 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
1221 | if (IS_ERR(ek)) | |
1222 | return ERR_CAST(ek); | |
1223 | ||
1224 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
1225 | cache_put(&ek->h, &svc_expkey_cache); | |
1226 | ||
1227 | if (IS_ERR(exp)) | |
1228 | return ERR_CAST(exp); | |
1229 | return exp; | |
1230 | } | |
1231 | ||
1232 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) | |
1233 | { | |
1234 | struct exp_flavor_info *f; | |
1235 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1236 | ||
1237 | /* legacy gss-only clients are always OK: */ | |
1238 | if (exp->ex_client == rqstp->rq_gssclient) | |
1239 | return 0; | |
1240 | /* ip-address based client; check sec= export option: */ | |
1241 | for (f = exp->ex_flavors; f < end; f++) { | |
1242 | if (f->pseudoflavor == rqstp->rq_flavor) | |
1243 | return 0; | |
1244 | } | |
1245 | /* defaults in absence of sec= options: */ | |
1246 | if (exp->ex_nflavors == 0) { | |
1247 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
1248 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
1249 | return 0; | |
1250 | } | |
1251 | return nfserr_wrongsec; | |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an | |
1256 | * auth_unix client) if it's available and has secinfo information; | |
1257 | * otherwise, will try to use rq_gssclient. | |
1258 | * | |
1259 | * Called from functions that handle requests; functions that do work on | |
1260 | * behalf of mountd are passed a single client name to use, and should | |
1261 | * use exp_get_by_name() or exp_find(). | |
1262 | */ | |
1263 | struct svc_export * | |
1264 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt, | |
1265 | struct dentry *dentry) | |
1266 | { | |
1267 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); | |
1268 | ||
1269 | if (rqstp->rq_client == NULL) | |
1270 | goto gss; | |
1271 | ||
1272 | /* First try the auth_unix client: */ | |
1273 | exp = exp_get_by_name(rqstp->rq_client, mnt, dentry, | |
1274 | &rqstp->rq_chandle); | |
1275 | if (PTR_ERR(exp) == -ENOENT) | |
1276 | goto gss; | |
1277 | if (IS_ERR(exp)) | |
1278 | return exp; | |
1279 | /* If it has secinfo, assume there are no gss/... clients */ | |
1280 | if (exp->ex_nflavors > 0) | |
1281 | return exp; | |
1282 | gss: | |
1283 | /* Otherwise, try falling back on gss client */ | |
1284 | if (rqstp->rq_gssclient == NULL) | |
1285 | return exp; | |
1286 | gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry, | |
1287 | &rqstp->rq_chandle); | |
1288 | if (PTR_ERR(gssexp) == -ENOENT) | |
1289 | return exp; | |
1290 | if (!IS_ERR(exp)) | |
1291 | exp_put(exp); | |
1292 | return gssexp; | |
1293 | } | |
1294 | ||
1295 | struct svc_export * | |
1296 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1297 | { | |
1298 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); | |
1299 | ||
1300 | if (rqstp->rq_client == NULL) | |
1301 | goto gss; | |
1302 | ||
1303 | /* First try the auth_unix client: */ | |
1304 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
1305 | if (PTR_ERR(exp) == -ENOENT) | |
1306 | goto gss; | |
1307 | if (IS_ERR(exp)) | |
1308 | return exp; | |
1309 | /* If it has secinfo, assume there are no gss/... clients */ | |
1310 | if (exp->ex_nflavors > 0) | |
1311 | return exp; | |
1312 | gss: | |
1313 | /* Otherwise, try falling back on gss client */ | |
1314 | if (rqstp->rq_gssclient == NULL) | |
1315 | return exp; | |
1316 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
1317 | &rqstp->rq_chandle); | |
1318 | if (PTR_ERR(gssexp) == -ENOENT) | |
1319 | return exp; | |
1320 | if (!IS_ERR(exp)) | |
1321 | exp_put(exp); | |
1322 | return gssexp; | |
1323 | } | |
1324 | ||
1325 | struct svc_export * | |
1326 | rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt, | |
1327 | struct dentry *dentry) | |
1328 | { | |
1329 | struct svc_export *exp; | |
1330 | ||
1331 | dget(dentry); | |
1332 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); | |
1333 | ||
1334 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { | |
1335 | struct dentry *parent; | |
1336 | ||
1337 | parent = dget_parent(dentry); | |
1338 | dput(dentry); | |
1339 | dentry = parent; | |
1340 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); | |
1341 | } | |
1342 | dput(dentry); | |
1343 | return exp; | |
1344 | } | |
1345 | ||
1346 | /* | |
1347 | * Called when we need the filehandle for the root of the pseudofs, | |
1348 | * for a given NFSv4 client. The root is defined to be the | |
1349 | * export point with fsid==0 | |
1350 | */ | |
1351 | __be32 | |
1352 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) | |
1353 | { | |
1354 | struct svc_export *exp; | |
1355 | __be32 rv; | |
1356 | u32 fsidv[2]; | |
1357 | ||
1358 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1359 | ||
1360 | exp = rqst_exp_find(rqstp, FSID_NUM, fsidv); | |
1361 | if (IS_ERR(exp)) | |
1362 | return nfserrno(PTR_ERR(exp)); | |
1363 | rv = fh_compose(fhp, exp, exp->ex_dentry, NULL); | |
1364 | if (rv) | |
1365 | goto out; | |
1366 | rv = check_nfsd_access(exp, rqstp); | |
1367 | out: | |
1368 | exp_put(exp); | |
1369 | return rv; | |
1370 | } | |
1371 | ||
1372 | /* Iterator */ | |
1373 | ||
1374 | static void *e_start(struct seq_file *m, loff_t *pos) | |
1375 | __acquires(svc_export_cache.hash_lock) | |
1376 | { | |
1377 | loff_t n = *pos; | |
1378 | unsigned hash, export; | |
1379 | struct cache_head *ch; | |
1380 | ||
1381 | exp_readlock(); | |
1382 | read_lock(&svc_export_cache.hash_lock); | |
1383 | if (!n--) | |
1384 | return SEQ_START_TOKEN; | |
1385 | hash = n >> 32; | |
1386 | export = n & ((1LL<<32) - 1); | |
1387 | ||
1388 | ||
1389 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1390 | if (!export--) | |
1391 | return ch; | |
1392 | n &= ~((1LL<<32) - 1); | |
1393 | do { | |
1394 | hash++; | |
1395 | n += 1LL<<32; | |
1396 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1397 | if (hash >= EXPORT_HASHMAX) | |
1398 | return NULL; | |
1399 | *pos = n+1; | |
1400 | return export_table[hash]; | |
1401 | } | |
1402 | ||
1403 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1404 | { | |
1405 | struct cache_head *ch = p; | |
1406 | int hash = (*pos >> 32); | |
1407 | ||
1408 | if (p == SEQ_START_TOKEN) | |
1409 | hash = 0; | |
1410 | else if (ch->next == NULL) { | |
1411 | hash++; | |
1412 | *pos += 1LL<<32; | |
1413 | } else { | |
1414 | ++*pos; | |
1415 | return ch->next; | |
1416 | } | |
1417 | *pos &= ~((1LL<<32) - 1); | |
1418 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1419 | hash++; | |
1420 | *pos += 1LL<<32; | |
1421 | } | |
1422 | if (hash >= EXPORT_HASHMAX) | |
1423 | return NULL; | |
1424 | ++*pos; | |
1425 | return export_table[hash]; | |
1426 | } | |
1427 | ||
1428 | static void e_stop(struct seq_file *m, void *p) | |
1429 | __releases(svc_export_cache.hash_lock) | |
1430 | { | |
1431 | read_unlock(&svc_export_cache.hash_lock); | |
1432 | exp_readunlock(); | |
1433 | } | |
1434 | ||
1435 | static struct flags { | |
1436 | int flag; | |
1437 | char *name[2]; | |
1438 | } expflags[] = { | |
1439 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1440 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1441 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1442 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1443 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1444 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1445 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1446 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1447 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1448 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1449 | #ifdef MSNFS | |
1450 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1451 | #endif | |
1452 | { 0, {"", ""}} | |
1453 | }; | |
1454 | ||
1455 | static void show_expflags(struct seq_file *m, int flags, int mask) | |
1456 | { | |
1457 | struct flags *flg; | |
1458 | int state, first = 0; | |
1459 | ||
1460 | for (flg = expflags; flg->flag; flg++) { | |
1461 | if (flg->flag & ~mask) | |
1462 | continue; | |
1463 | state = (flg->flag & flags) ? 0 : 1; | |
1464 | if (*flg->name[state]) | |
1465 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | static void show_secinfo_flags(struct seq_file *m, int flags) | |
1470 | { | |
1471 | seq_printf(m, ","); | |
1472 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1473 | } | |
1474 | ||
1475 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) | |
1476 | { | |
1477 | struct exp_flavor_info *f; | |
1478 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1479 | int lastflags = 0, first = 0; | |
1480 | ||
1481 | if (exp->ex_nflavors == 0) | |
1482 | return; | |
1483 | for (f = exp->ex_flavors; f < end; f++) { | |
1484 | if (first || f->flags != lastflags) { | |
1485 | if (!first) | |
1486 | show_secinfo_flags(m, lastflags); | |
1487 | seq_printf(m, ",sec=%d", f->pseudoflavor); | |
1488 | lastflags = f->flags; | |
1489 | } else { | |
1490 | seq_printf(m, ":%d", f->pseudoflavor); | |
1491 | } | |
1492 | } | |
1493 | show_secinfo_flags(m, lastflags); | |
1494 | } | |
1495 | ||
1496 | static void exp_flags(struct seq_file *m, int flag, int fsid, | |
1497 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1498 | { | |
1499 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1500 | if (flag & NFSEXP_FSID) | |
1501 | seq_printf(m, ",fsid=%d", fsid); | |
1502 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1503 | seq_printf(m, ",anonuid=%u", anonu); | |
1504 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1505 | seq_printf(m, ",anongid=%u", anong); | |
1506 | if (fsloc && fsloc->locations_count > 0) { | |
1507 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1508 | int i; | |
1509 | ||
1510 | seq_printf(m, ",%s=", loctype); | |
1511 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); | |
1512 | seq_putc(m, '@'); | |
1513 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1514 | for (i = 1; i < fsloc->locations_count; i++) { | |
1515 | seq_putc(m, ';'); | |
1516 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1517 | seq_putc(m, '@'); | |
1518 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1519 | } | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | static int e_show(struct seq_file *m, void *p) | |
1524 | { | |
1525 | struct cache_head *cp = p; | |
1526 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1527 | ||
1528 | if (p == SEQ_START_TOKEN) { | |
1529 | seq_puts(m, "# Version 1.1\n"); | |
1530 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | cache_get(&exp->h); | |
1535 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1536 | return 0; | |
1537 | cache_put(&exp->h, &svc_export_cache); | |
1538 | return svc_export_show(m, &svc_export_cache, cp); | |
1539 | } | |
1540 | ||
1541 | struct seq_operations nfs_exports_op = { | |
1542 | .start = e_start, | |
1543 | .next = e_next, | |
1544 | .stop = e_stop, | |
1545 | .show = e_show, | |
1546 | }; | |
1547 | ||
1548 | /* | |
1549 | * Add or modify a client. | |
1550 | * Change requests may involve the list of host addresses. The list of | |
1551 | * exports and possibly existing uid maps are left untouched. | |
1552 | */ | |
1553 | int | |
1554 | exp_addclient(struct nfsctl_client *ncp) | |
1555 | { | |
1556 | struct auth_domain *dom; | |
1557 | int i, err; | |
1558 | ||
1559 | /* First, consistency check. */ | |
1560 | err = -EINVAL; | |
1561 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1562 | goto out; | |
1563 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1564 | goto out; | |
1565 | ||
1566 | /* Lock the hashtable */ | |
1567 | exp_writelock(); | |
1568 | ||
1569 | dom = unix_domain_find(ncp->cl_ident); | |
1570 | ||
1571 | err = -ENOMEM; | |
1572 | if (!dom) | |
1573 | goto out_unlock; | |
1574 | ||
1575 | /* Insert client into hashtable. */ | |
1576 | for (i = 0; i < ncp->cl_naddr; i++) | |
1577 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1578 | ||
1579 | auth_unix_forget_old(dom); | |
1580 | auth_domain_put(dom); | |
1581 | ||
1582 | err = 0; | |
1583 | ||
1584 | out_unlock: | |
1585 | exp_writeunlock(); | |
1586 | out: | |
1587 | return err; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * Delete a client given an identifier. | |
1592 | */ | |
1593 | int | |
1594 | exp_delclient(struct nfsctl_client *ncp) | |
1595 | { | |
1596 | int err; | |
1597 | struct auth_domain *dom; | |
1598 | ||
1599 | err = -EINVAL; | |
1600 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1601 | goto out; | |
1602 | ||
1603 | /* Lock the hashtable */ | |
1604 | exp_writelock(); | |
1605 | ||
1606 | dom = auth_domain_find(ncp->cl_ident); | |
1607 | /* just make sure that no addresses work | |
1608 | * and that it will expire soon | |
1609 | */ | |
1610 | if (dom) { | |
1611 | err = auth_unix_forget_old(dom); | |
1612 | auth_domain_put(dom); | |
1613 | } | |
1614 | ||
1615 | exp_writeunlock(); | |
1616 | out: | |
1617 | return err; | |
1618 | } | |
1619 | ||
1620 | /* | |
1621 | * Verify that string is non-empty and does not exceed max length. | |
1622 | */ | |
1623 | static int | |
1624 | exp_verify_string(char *cp, int max) | |
1625 | { | |
1626 | int i; | |
1627 | ||
1628 | for (i = 0; i < max; i++) | |
1629 | if (!cp[i]) | |
1630 | return i; | |
1631 | cp[i] = 0; | |
1632 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * Initialize the exports module. | |
1638 | */ | |
1639 | int | |
1640 | nfsd_export_init(void) | |
1641 | { | |
1642 | int rv; | |
1643 | dprintk("nfsd: initializing export module.\n"); | |
1644 | ||
1645 | rv = cache_register(&svc_export_cache); | |
1646 | if (rv) | |
1647 | return rv; | |
1648 | rv = cache_register(&svc_expkey_cache); | |
1649 | if (rv) | |
1650 | cache_unregister(&svc_export_cache); | |
1651 | return rv; | |
1652 | ||
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * Flush exports table - called when last nfsd thread is killed | |
1657 | */ | |
1658 | void | |
1659 | nfsd_export_flush(void) | |
1660 | { | |
1661 | exp_writelock(); | |
1662 | cache_purge(&svc_expkey_cache); | |
1663 | cache_purge(&svc_export_cache); | |
1664 | exp_writeunlock(); | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Shutdown the exports module. | |
1669 | */ | |
1670 | void | |
1671 | nfsd_export_shutdown(void) | |
1672 | { | |
1673 | ||
1674 | dprintk("nfsd: shutting down export module.\n"); | |
1675 | ||
1676 | exp_writelock(); | |
1677 | ||
1678 | cache_unregister(&svc_expkey_cache); | |
1679 | cache_unregister(&svc_export_cache); | |
1680 | svcauth_unix_purge(); | |
1681 | ||
1682 | exp_writeunlock(); | |
1683 | dprintk("nfsd: export shutdown complete.\n"); | |
1684 | } |