Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 | 17 | #include <linux/namei.h> |
f35279d3 | 18 | #include <linux/module.h> |
a5694255 | 19 | #include <linux/exportfs.h> |
1da177e4 | 20 | |
1da177e4 | 21 | #include <linux/nfsd/syscall.h> |
f15364bd | 22 | #include <net/ipv6.h> |
1da177e4 | 23 | |
9a74af21 BH |
24 | #include "nfsd.h" |
25 | ||
1da177e4 | 26 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 LT |
27 | |
28 | typedef struct auth_domain svc_client; | |
29 | typedef struct svc_export svc_export; | |
30 | ||
31 | static void exp_do_unexport(svc_export *unexp); | |
32 | static int exp_verify_string(char *cp, int max); | |
33 | ||
34 | /* | |
35 | * We have two caches. | |
36 | * One maps client+vfsmnt+dentry to export options - the export map | |
37 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
38 | * | |
39 | * The export options are actually stored in the first map, and the | |
40 | * second map contains a reference to the entry in the first map. | |
41 | */ | |
42 | ||
43 | #define EXPKEY_HASHBITS 8 | |
44 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
45 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
46 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
47 | ||
74cae61a | 48 | static void expkey_put(struct kref *ref) |
1da177e4 | 49 | { |
baab935f N |
50 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
51 | ||
52 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
53 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
54 | path_put(&key->ek_path); | |
baab935f N |
55 | auth_domain_put(key->ek_client); |
56 | kfree(key); | |
1da177e4 LT |
57 | } |
58 | ||
59 | static void expkey_request(struct cache_detail *cd, | |
60 | struct cache_head *h, | |
61 | char **bpp, int *blen) | |
62 | { | |
63 | /* client fsidtype \xfsid */ | |
64 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
65 | char type[5]; | |
66 | ||
67 | qword_add(bpp, blen, ek->ek_client->name); | |
68 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
69 | qword_add(bpp, blen, type); | |
70 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
71 | (*bpp)[-1] = '\n'; | |
72 | } | |
73 | ||
bc74b4f5 TM |
74 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
75 | { | |
76 | return sunrpc_cache_pipe_upcall(cd, h, expkey_request); | |
77 | } | |
78 | ||
8d270f7f N |
79 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
80 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
74cae61a AB |
81 | static struct cache_detail svc_expkey_cache; |
82 | ||
1da177e4 LT |
83 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
84 | { | |
85 | /* client fsidtype fsid [path] */ | |
86 | char *buf; | |
87 | int len; | |
88 | struct auth_domain *dom = NULL; | |
89 | int err; | |
90 | int fsidtype; | |
91 | char *ep; | |
92 | struct svc_expkey key; | |
30bc4dfd | 93 | struct svc_expkey *ek = NULL; |
1da177e4 LT |
94 | |
95 | if (mesg[mlen-1] != '\n') | |
96 | return -EINVAL; | |
97 | mesg[mlen-1] = 0; | |
98 | ||
99 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
100 | err = -ENOMEM; | |
30bc4dfd BF |
101 | if (!buf) |
102 | goto out; | |
1da177e4 LT |
103 | |
104 | err = -EINVAL; | |
105 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
106 | goto out; | |
107 | ||
108 | err = -ENOENT; | |
109 | dom = auth_domain_find(buf); | |
110 | if (!dom) | |
111 | goto out; | |
112 | dprintk("found domain %s\n", buf); | |
113 | ||
114 | err = -EINVAL; | |
115 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
116 | goto out; | |
117 | fsidtype = simple_strtoul(buf, &ep, 10); | |
118 | if (*ep) | |
119 | goto out; | |
120 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 121 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
122 | goto out; |
123 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
124 | goto out; | |
125 | dprintk("found fsid length %d\n", len); | |
126 | if (len != key_len(fsidtype)) | |
127 | goto out; | |
128 | ||
129 | /* OK, we seem to have a valid key */ | |
130 | key.h.flags = 0; | |
131 | key.h.expiry_time = get_expiry(&mesg); | |
132 | if (key.h.expiry_time == 0) | |
133 | goto out; | |
134 | ||
135 | key.ek_client = dom; | |
136 | key.ek_fsidtype = fsidtype; | |
137 | memcpy(key.ek_fsid, buf, len); | |
138 | ||
8d270f7f N |
139 | ek = svc_expkey_lookup(&key); |
140 | err = -ENOMEM; | |
141 | if (!ek) | |
142 | goto out; | |
143 | ||
1da177e4 | 144 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 145 | err = -EINVAL; |
30bc4dfd BF |
146 | len = qword_get(&mesg, buf, PAGE_SIZE); |
147 | if (len < 0) | |
1da177e4 LT |
148 | goto out; |
149 | dprintk("Path seems to be <%s>\n", buf); | |
150 | err = 0; | |
151 | if (len == 0) { | |
1da177e4 | 152 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 153 | ek = svc_expkey_update(&key, ek); |
30bc4dfd BF |
154 | if (!ek) |
155 | err = -ENOMEM; | |
1da177e4 | 156 | } else { |
a63bb996 | 157 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 158 | if (err) |
1da177e4 LT |
159 | goto out; |
160 | ||
161 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 162 | |
8d270f7f | 163 | ek = svc_expkey_update(&key, ek); |
30bc4dfd | 164 | if (!ek) |
8d270f7f | 165 | err = -ENOMEM; |
a63bb996 | 166 | path_put(&key.ek_path); |
1da177e4 LT |
167 | } |
168 | cache_flush(); | |
169 | out: | |
30bc4dfd BF |
170 | if (ek) |
171 | cache_put(&ek->h, &svc_expkey_cache); | |
1da177e4 LT |
172 | if (dom) |
173 | auth_domain_put(dom); | |
f99d49ad | 174 | kfree(buf); |
1da177e4 LT |
175 | return err; |
176 | } | |
177 | ||
178 | static int expkey_show(struct seq_file *m, | |
179 | struct cache_detail *cd, | |
180 | struct cache_head *h) | |
181 | { | |
182 | struct svc_expkey *ek ; | |
af6a4e28 | 183 | int i; |
1da177e4 LT |
184 | |
185 | if (h ==NULL) { | |
186 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
187 | return 0; | |
188 | } | |
189 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
190 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
191 | ek->ek_fsidtype); | |
192 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
193 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
194 | if (test_bit(CACHE_VALID, &h->flags) && |
195 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
196 | seq_printf(m, " "); | |
c32c2f63 | 197 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
198 | } |
199 | seq_printf(m, "\n"); | |
200 | return 0; | |
201 | } | |
1da177e4 | 202 | |
8d270f7f | 203 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 204 | { |
8d270f7f N |
205 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
206 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
207 | ||
208 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
209 | orig->ek_client != new->ek_client || | |
210 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
211 | return 0; |
212 | return 1; | |
213 | } | |
214 | ||
8d270f7f N |
215 | static inline void expkey_init(struct cache_head *cnew, |
216 | struct cache_head *citem) | |
1da177e4 | 217 | { |
8d270f7f N |
218 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
219 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
220 | ||
efc36aa5 | 221 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
222 | new->ek_client = item->ek_client; |
223 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
224 | |
225 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
226 | } |
227 | ||
8d270f7f N |
228 | static inline void expkey_update(struct cache_head *cnew, |
229 | struct cache_head *citem) | |
1da177e4 | 230 | { |
8d270f7f N |
231 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
232 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
233 | ||
e83aece3 JB |
234 | new->ek_path = item->ek_path; |
235 | path_get(&item->ek_path); | |
1da177e4 LT |
236 | } |
237 | ||
8d270f7f N |
238 | static struct cache_head *expkey_alloc(void) |
239 | { | |
240 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
241 | if (i) | |
242 | return &i->h; | |
243 | else | |
244 | return NULL; | |
245 | } | |
246 | ||
74cae61a | 247 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
248 | .owner = THIS_MODULE, |
249 | .hash_size = EXPKEY_HASHMAX, | |
250 | .hash_table = expkey_table, | |
251 | .name = "nfsd.fh", | |
252 | .cache_put = expkey_put, | |
bc74b4f5 | 253 | .cache_upcall = expkey_upcall, |
8d270f7f N |
254 | .cache_parse = expkey_parse, |
255 | .cache_show = expkey_show, | |
256 | .match = expkey_match, | |
257 | .init = expkey_init, | |
258 | .update = expkey_update, | |
259 | .alloc = expkey_alloc, | |
260 | }; | |
261 | ||
262 | static struct svc_expkey * | |
263 | svc_expkey_lookup(struct svc_expkey *item) | |
264 | { | |
265 | struct cache_head *ch; | |
266 | int hash = item->ek_fsidtype; | |
267 | char * cp = (char*)item->ek_fsid; | |
268 | int len = key_len(item->ek_fsidtype); | |
269 | ||
270 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
271 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
272 | hash &= EXPKEY_HASHMASK; | |
273 | ||
274 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
275 | hash); | |
276 | if (ch) | |
277 | return container_of(ch, struct svc_expkey, h); | |
278 | else | |
279 | return NULL; | |
280 | } | |
281 | ||
282 | static struct svc_expkey * | |
283 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
284 | { | |
285 | struct cache_head *ch; | |
286 | int hash = new->ek_fsidtype; | |
287 | char * cp = (char*)new->ek_fsid; | |
288 | int len = key_len(new->ek_fsidtype); | |
289 | ||
290 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
291 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
292 | hash &= EXPKEY_HASHMASK; | |
293 | ||
294 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
295 | &old->h, hash); | |
296 | if (ch) | |
297 | return container_of(ch, struct svc_expkey, h); | |
298 | else | |
299 | return NULL; | |
300 | } | |
301 | ||
1da177e4 LT |
302 | |
303 | #define EXPORT_HASHBITS 8 | |
304 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
305 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
306 | ||
307 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
308 | ||
93346919 MN |
309 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
310 | { | |
311 | int i; | |
312 | ||
313 | for (i = 0; i < fsloc->locations_count; i++) { | |
314 | kfree(fsloc->locations[i].path); | |
315 | kfree(fsloc->locations[i].hosts); | |
316 | } | |
317 | kfree(fsloc->locations); | |
318 | } | |
319 | ||
baab935f | 320 | static void svc_export_put(struct kref *ref) |
1da177e4 | 321 | { |
baab935f | 322 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 323 | path_put(&exp->ex_path); |
baab935f | 324 | auth_domain_put(exp->ex_client); |
54775491 | 325 | kfree(exp->ex_pathname); |
93346919 | 326 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 327 | kfree(exp); |
1da177e4 LT |
328 | } |
329 | ||
330 | static void svc_export_request(struct cache_detail *cd, | |
331 | struct cache_head *h, | |
332 | char **bpp, int *blen) | |
333 | { | |
334 | /* client path */ | |
335 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
336 | char *pth; | |
337 | ||
338 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 339 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
340 | if (IS_ERR(pth)) { |
341 | /* is this correct? */ | |
342 | (*bpp)[0] = '\n'; | |
343 | return; | |
344 | } | |
345 | qword_add(bpp, blen, pth); | |
346 | (*bpp)[-1] = '\n'; | |
347 | } | |
348 | ||
bc74b4f5 TM |
349 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
350 | { | |
351 | return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); | |
352 | } | |
353 | ||
74cae61a AB |
354 | static struct svc_export *svc_export_update(struct svc_export *new, |
355 | struct svc_export *old); | |
4f7774c3 | 356 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 357 | |
af6a4e28 | 358 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) |
1da177e4 LT |
359 | { |
360 | ||
361 | /* We currently export only dirs and regular files. | |
362 | * This is what umountd does. | |
363 | */ | |
364 | if (!S_ISDIR(inode->i_mode) && | |
365 | !S_ISREG(inode->i_mode)) | |
366 | return -ENOTDIR; | |
367 | ||
368 | /* There are two requirements on a filesystem to be exportable. | |
369 | * 1: We must be able to identify the filesystem from a number. | |
370 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 371 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
372 | * 2: We must be able to find an inode from a filehandle. |
373 | * This means that s_export_op must be set. | |
374 | */ | |
375 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
af6a4e28 N |
376 | !(flags & NFSEXP_FSID) && |
377 | uuid == NULL) { | |
3e3b4800 | 378 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
379 | return -EINVAL; |
380 | } | |
cfaea787 CH |
381 | |
382 | if (!inode->i_sb->s_export_op || | |
383 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
384 | dprintk("exp_export: export of invalid fs type.\n"); |
385 | return -EINVAL; | |
386 | } | |
387 | ||
1da177e4 LT |
388 | return 0; |
389 | ||
390 | } | |
391 | ||
93346919 MN |
392 | #ifdef CONFIG_NFSD_V4 |
393 | ||
394 | static int | |
395 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
396 | { | |
397 | int len; | |
398 | int migrated, i, err; | |
399 | ||
93346919 MN |
400 | /* listsize */ |
401 | err = get_int(mesg, &fsloc->locations_count); | |
402 | if (err) | |
403 | return err; | |
404 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
405 | return -EINVAL; | |
406 | if (fsloc->locations_count == 0) | |
407 | return 0; | |
408 | ||
409 | fsloc->locations = kzalloc(fsloc->locations_count | |
410 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
411 | if (!fsloc->locations) | |
412 | return -ENOMEM; | |
413 | for (i=0; i < fsloc->locations_count; i++) { | |
414 | /* colon separated host list */ | |
415 | err = -EINVAL; | |
416 | len = qword_get(mesg, buf, PAGE_SIZE); | |
417 | if (len <= 0) | |
418 | goto out_free_all; | |
419 | err = -ENOMEM; | |
420 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
421 | if (!fsloc->locations[i].hosts) | |
422 | goto out_free_all; | |
423 | err = -EINVAL; | |
424 | /* slash separated path component list */ | |
425 | len = qword_get(mesg, buf, PAGE_SIZE); | |
426 | if (len <= 0) | |
427 | goto out_free_all; | |
428 | err = -ENOMEM; | |
429 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
430 | if (!fsloc->locations[i].path) | |
431 | goto out_free_all; | |
432 | } | |
433 | /* migrated */ | |
434 | err = get_int(mesg, &migrated); | |
435 | if (err) | |
436 | goto out_free_all; | |
437 | err = -EINVAL; | |
438 | if (migrated < 0 || migrated > 1) | |
439 | goto out_free_all; | |
440 | fsloc->migrated = migrated; | |
441 | return 0; | |
442 | out_free_all: | |
443 | nfsd4_fslocs_free(fsloc); | |
444 | return err; | |
445 | } | |
446 | ||
e677bfe4 AA |
447 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
448 | { | |
449 | int listsize, err; | |
450 | struct exp_flavor_info *f; | |
451 | ||
452 | err = get_int(mesg, &listsize); | |
453 | if (err) | |
454 | return err; | |
455 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
456 | return -EINVAL; | |
457 | ||
458 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
459 | err = get_int(mesg, &f->pseudoflavor); | |
460 | if (err) | |
461 | return err; | |
462 | /* | |
80492e7d RK |
463 | * XXX: It would be nice to also check whether this |
464 | * pseudoflavor is supported, so we can discover the | |
465 | * problem at export time instead of when a client fails | |
466 | * to authenticate. | |
e677bfe4 | 467 | */ |
e677bfe4 AA |
468 | err = get_int(mesg, &f->flags); |
469 | if (err) | |
470 | return err; | |
471 | /* Only some flags are allowed to differ between flavors: */ | |
472 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
473 | return -EINVAL; | |
474 | } | |
475 | exp->ex_nflavors = listsize; | |
476 | return 0; | |
477 | } | |
478 | ||
93346919 | 479 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
480 | static inline int |
481 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
482 | static inline int | |
483 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
484 | #endif |
485 | ||
1da177e4 LT |
486 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
487 | { | |
488 | /* client path expiry [flags anonuid anongid fsid] */ | |
489 | char *buf; | |
490 | int len; | |
491 | int err; | |
492 | struct auth_domain *dom = NULL; | |
c1a2a475 | 493 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
494 | int an_int; |
495 | ||
1da177e4 LT |
496 | if (mesg[mlen-1] != '\n') |
497 | return -EINVAL; | |
498 | mesg[mlen-1] = 0; | |
499 | ||
500 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
501 | if (!buf) |
502 | return -ENOMEM; | |
1da177e4 LT |
503 | |
504 | /* client */ | |
1da177e4 | 505 | err = -EINVAL; |
c1a2a475 AV |
506 | len = qword_get(&mesg, buf, PAGE_SIZE); |
507 | if (len <= 0) | |
508 | goto out; | |
1da177e4 LT |
509 | |
510 | err = -ENOENT; | |
511 | dom = auth_domain_find(buf); | |
512 | if (!dom) | |
513 | goto out; | |
514 | ||
515 | /* path */ | |
516 | err = -EINVAL; | |
c1a2a475 AV |
517 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
518 | goto out1; | |
519 | ||
520 | err = kern_path(buf, 0, &exp.ex_path); | |
521 | if (err) | |
522 | goto out1; | |
1da177e4 | 523 | |
1da177e4 | 524 | exp.ex_client = dom; |
c1a2a475 | 525 | |
b009a873 | 526 | err = -ENOMEM; |
c1a2a475 | 527 | exp.ex_pathname = kstrdup(buf, GFP_KERNEL); |
54775491 | 528 | if (!exp.ex_pathname) |
c1a2a475 | 529 | goto out2; |
1da177e4 LT |
530 | |
531 | /* expiry */ | |
532 | err = -EINVAL; | |
533 | exp.h.expiry_time = get_expiry(&mesg); | |
534 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 535 | goto out3; |
1da177e4 LT |
536 | |
537 | /* flags */ | |
538 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
539 | if (err == -ENOENT) { |
540 | err = 0; | |
1da177e4 | 541 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 542 | } else { |
c1a2a475 AV |
543 | if (err || an_int < 0) |
544 | goto out3; | |
1da177e4 LT |
545 | exp.ex_flags= an_int; |
546 | ||
547 | /* anon uid */ | |
548 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
549 | if (err) |
550 | goto out3; | |
1da177e4 LT |
551 | exp.ex_anon_uid= an_int; |
552 | ||
553 | /* anon gid */ | |
554 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
555 | if (err) |
556 | goto out3; | |
1da177e4 LT |
557 | exp.ex_anon_gid= an_int; |
558 | ||
559 | /* fsid */ | |
560 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
561 | if (err) |
562 | goto out3; | |
1da177e4 LT |
563 | exp.ex_fsid = an_int; |
564 | ||
af6a4e28 N |
565 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
566 | if (strcmp(buf, "fsloc") == 0) | |
567 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
568 | else if (strcmp(buf, "uuid") == 0) { | |
569 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
570 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
571 | if (len != 16) | |
572 | err = -EINVAL; | |
573 | else { | |
574 | exp.ex_uuid = | |
575 | kmemdup(buf, 16, GFP_KERNEL); | |
576 | if (exp.ex_uuid == NULL) | |
577 | err = -ENOMEM; | |
578 | } | |
e677bfe4 AA |
579 | } else if (strcmp(buf, "secinfo") == 0) |
580 | err = secinfo_parse(&mesg, buf, &exp); | |
581 | else | |
af6a4e28 N |
582 | /* quietly ignore unknown words and anything |
583 | * following. Newer user-space can try to set | |
584 | * new values, then see what the result was. | |
585 | */ | |
586 | break; | |
587 | if (err) | |
c1a2a475 | 588 | goto out4; |
af6a4e28 | 589 | } |
93346919 | 590 | |
c1a2a475 | 591 | err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags, |
af6a4e28 | 592 | exp.ex_uuid); |
c1a2a475 AV |
593 | if (err) |
594 | goto out4; | |
1da177e4 LT |
595 | } |
596 | ||
4f7774c3 | 597 | expp = svc_export_lookup(&exp); |
1da177e4 | 598 | if (expp) |
4f7774c3 N |
599 | expp = svc_export_update(&exp, expp); |
600 | else | |
601 | err = -ENOMEM; | |
1da177e4 | 602 | cache_flush(); |
4f7774c3 N |
603 | if (expp == NULL) |
604 | err = -ENOMEM; | |
605 | else | |
606 | exp_put(expp); | |
c1a2a475 | 607 | out4: |
af6a4e28 N |
608 | nfsd4_fslocs_free(&exp.ex_fslocs); |
609 | kfree(exp.ex_uuid); | |
c1a2a475 | 610 | out3: |
54775491 | 611 | kfree(exp.ex_pathname); |
c1a2a475 AV |
612 | out2: |
613 | path_put(&exp.ex_path); | |
614 | out1: | |
615 | auth_domain_put(dom); | |
616 | out: | |
f99d49ad | 617 | kfree(buf); |
1da177e4 LT |
618 | return err; |
619 | } | |
620 | ||
93346919 MN |
621 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
622 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
91fe39d3 | 623 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
624 | |
625 | static int svc_export_show(struct seq_file *m, | |
626 | struct cache_detail *cd, | |
627 | struct cache_head *h) | |
628 | { | |
629 | struct svc_export *exp ; | |
630 | ||
631 | if (h ==NULL) { | |
632 | seq_puts(m, "#path domain(flags)\n"); | |
633 | return 0; | |
634 | } | |
635 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 636 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
637 | seq_putc(m, '\t'); |
638 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
639 | seq_putc(m, '('); | |
640 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 641 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
642 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
643 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
644 | if (exp->ex_uuid) { |
645 | int i; | |
646 | seq_puts(m, ",uuid="); | |
647 | for (i=0; i<16; i++) { | |
648 | if ((i&3) == 0 && i) | |
649 | seq_putc(m, ':'); | |
650 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
651 | } | |
652 | } | |
91fe39d3 | 653 | show_secinfo(m, exp); |
af6a4e28 | 654 | } |
1da177e4 LT |
655 | seq_puts(m, ")\n"); |
656 | return 0; | |
657 | } | |
4f7774c3 | 658 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 659 | { |
4f7774c3 N |
660 | struct svc_export *orig = container_of(a, struct svc_export, h); |
661 | struct svc_export *new = container_of(b, struct svc_export, h); | |
662 | return orig->ex_client == new->ex_client && | |
54775491 JB |
663 | orig->ex_path.dentry == new->ex_path.dentry && |
664 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 665 | } |
4f7774c3 N |
666 | |
667 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 668 | { |
4f7774c3 N |
669 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
670 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
671 | ||
efc36aa5 | 672 | kref_get(&item->ex_client->ref); |
1da177e4 | 673 | new->ex_client = item->ex_client; |
54775491 JB |
674 | new->ex_path.dentry = dget(item->ex_path.dentry); |
675 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
676 | new->ex_pathname = NULL; | |
93346919 MN |
677 | new->ex_fslocs.locations = NULL; |
678 | new->ex_fslocs.locations_count = 0; | |
679 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
680 | } |
681 | ||
4f7774c3 | 682 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 683 | { |
4f7774c3 N |
684 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
685 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 686 | int i; |
4f7774c3 | 687 | |
1da177e4 LT |
688 | new->ex_flags = item->ex_flags; |
689 | new->ex_anon_uid = item->ex_anon_uid; | |
690 | new->ex_anon_gid = item->ex_anon_gid; | |
691 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
692 | new->ex_uuid = item->ex_uuid; |
693 | item->ex_uuid = NULL; | |
54775491 JB |
694 | new->ex_pathname = item->ex_pathname; |
695 | item->ex_pathname = NULL; | |
93346919 MN |
696 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
697 | item->ex_fslocs.locations = NULL; | |
698 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
699 | item->ex_fslocs.locations_count = 0; | |
700 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
701 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
702 | new->ex_nflavors = item->ex_nflavors; |
703 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
704 | new->ex_flavors[i] = item->ex_flavors[i]; | |
705 | } | |
1da177e4 LT |
706 | } |
707 | ||
4f7774c3 N |
708 | static struct cache_head *svc_export_alloc(void) |
709 | { | |
710 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
711 | if (i) | |
712 | return &i->h; | |
713 | else | |
714 | return NULL; | |
715 | } | |
716 | ||
717 | struct cache_detail svc_export_cache = { | |
718 | .owner = THIS_MODULE, | |
719 | .hash_size = EXPORT_HASHMAX, | |
720 | .hash_table = export_table, | |
721 | .name = "nfsd.export", | |
722 | .cache_put = svc_export_put, | |
bc74b4f5 | 723 | .cache_upcall = svc_export_upcall, |
4f7774c3 N |
724 | .cache_parse = svc_export_parse, |
725 | .cache_show = svc_export_show, | |
726 | .match = svc_export_match, | |
727 | .init = svc_export_init, | |
728 | .update = export_update, | |
729 | .alloc = svc_export_alloc, | |
730 | }; | |
731 | ||
732 | static struct svc_export * | |
733 | svc_export_lookup(struct svc_export *exp) | |
734 | { | |
735 | struct cache_head *ch; | |
736 | int hash; | |
737 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
54775491 JB |
738 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
739 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
4f7774c3 N |
740 | |
741 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
742 | hash); | |
743 | if (ch) | |
744 | return container_of(ch, struct svc_export, h); | |
745 | else | |
746 | return NULL; | |
747 | } | |
748 | ||
74cae61a | 749 | static struct svc_export * |
4f7774c3 N |
750 | svc_export_update(struct svc_export *new, struct svc_export *old) |
751 | { | |
752 | struct cache_head *ch; | |
753 | int hash; | |
754 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
54775491 JB |
755 | hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS); |
756 | hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS); | |
4f7774c3 N |
757 | |
758 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
759 | &old->h, | |
760 | hash); | |
761 | if (ch) | |
762 | return container_of(ch, struct svc_export, h); | |
763 | else | |
764 | return NULL; | |
765 | } | |
1da177e4 LT |
766 | |
767 | ||
74cae61a | 768 | static struct svc_expkey * |
1da177e4 LT |
769 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
770 | { | |
771 | struct svc_expkey key, *ek; | |
772 | int err; | |
773 | ||
774 | if (!clp) | |
2d3bb252 | 775 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
776 | |
777 | key.ek_client = clp; | |
778 | key.ek_fsidtype = fsid_type; | |
779 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
780 | ||
8d270f7f | 781 | ek = svc_expkey_lookup(&key); |
2d3bb252 BF |
782 | if (ek == NULL) |
783 | return ERR_PTR(-ENOMEM); | |
784 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
785 | if (err) | |
786 | return ERR_PTR(err); | |
1da177e4 LT |
787 | return ek; |
788 | } | |
789 | ||
790 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
791 | struct svc_export *exp) | |
792 | { | |
793 | struct svc_expkey key, *ek; | |
794 | ||
795 | key.ek_client = clp; | |
796 | key.ek_fsidtype = fsid_type; | |
797 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
e83aece3 | 798 | key.ek_path = exp->ex_path; |
1da177e4 LT |
799 | key.h.expiry_time = NEVER; |
800 | key.h.flags = 0; | |
801 | ||
8d270f7f N |
802 | ek = svc_expkey_lookup(&key); |
803 | if (ek) | |
804 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 805 | if (ek) { |
baab935f | 806 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
807 | return 0; |
808 | } | |
809 | return -ENOMEM; | |
810 | } | |
811 | ||
812 | /* | |
813 | * Find the client's export entry matching xdev/xino. | |
814 | */ | |
815 | static inline struct svc_expkey * | |
816 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
817 | { | |
818 | u32 fsidv[3]; | |
819 | ||
820 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
821 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
822 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 823 | } |
af6a4e28 N |
824 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
825 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
826 | } |
827 | ||
828 | /* | |
829 | * Find the client's export entry matching fsid | |
830 | */ | |
831 | static inline struct svc_expkey * | |
832 | exp_get_fsid_key(svc_client *clp, int fsid) | |
833 | { | |
834 | u32 fsidv[2]; | |
835 | ||
af6a4e28 | 836 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 837 | |
af6a4e28 | 838 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
839 | } |
840 | ||
55430e2e AV |
841 | static svc_export *exp_get_by_name(svc_client *clp, const struct path *path, |
842 | struct cache_req *reqp) | |
1da177e4 LT |
843 | { |
844 | struct svc_export *exp, key; | |
2d3bb252 | 845 | int err; |
e83aece3 | 846 | |
1da177e4 | 847 | if (!clp) |
2d3bb252 | 848 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
849 | |
850 | key.ex_client = clp; | |
55430e2e | 851 | key.ex_path = *path; |
1da177e4 | 852 | |
4f7774c3 | 853 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
854 | if (exp == NULL) |
855 | return ERR_PTR(-ENOMEM); | |
856 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
857 | if (err) | |
858 | return ERR_PTR(err); | |
1da177e4 LT |
859 | return exp; |
860 | } | |
861 | ||
862 | /* | |
863 | * Find the export entry for a given dentry. | |
864 | */ | |
5bf3bd2b | 865 | static struct svc_export *exp_parent(svc_client *clp, struct path *path) |
1da177e4 | 866 | { |
5bf3bd2b AV |
867 | struct dentry *saved = dget(path->dentry); |
868 | svc_export *exp = exp_get_by_name(clp, path, NULL); | |
869 | ||
870 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
871 | struct dentry *parent = dget_parent(path->dentry); | |
872 | dput(path->dentry); | |
873 | path->dentry = parent; | |
874 | exp = exp_get_by_name(clp, path, NULL); | |
1da177e4 | 875 | } |
5bf3bd2b AV |
876 | dput(path->dentry); |
877 | path->dentry = saved; | |
1da177e4 LT |
878 | return exp; |
879 | } | |
880 | ||
881 | /* | |
882 | * Hashtable locking. Write locks are placed only by user processes | |
883 | * wanting to modify export information. | |
884 | * Write locking only done in this file. Read locking | |
885 | * needed externally. | |
886 | */ | |
887 | ||
888 | static DECLARE_RWSEM(hash_sem); | |
889 | ||
890 | void | |
891 | exp_readlock(void) | |
892 | { | |
893 | down_read(&hash_sem); | |
894 | } | |
895 | ||
896 | static inline void | |
897 | exp_writelock(void) | |
898 | { | |
899 | down_write(&hash_sem); | |
900 | } | |
901 | ||
902 | void | |
903 | exp_readunlock(void) | |
904 | { | |
905 | up_read(&hash_sem); | |
906 | } | |
907 | ||
908 | static inline void | |
909 | exp_writeunlock(void) | |
910 | { | |
911 | up_write(&hash_sem); | |
912 | } | |
913 | ||
914 | static void exp_fsid_unhash(struct svc_export *exp) | |
915 | { | |
916 | struct svc_expkey *ek; | |
917 | ||
918 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
919 | return; | |
920 | ||
921 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
2d3bb252 | 922 | if (!IS_ERR(ek)) { |
1da177e4 | 923 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 924 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
925 | } |
926 | svc_expkey_cache.nextcheck = get_seconds(); | |
927 | } | |
928 | ||
929 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
930 | { | |
931 | u32 fsid[2]; | |
932 | ||
933 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
934 | return 0; | |
935 | ||
af6a4e28 N |
936 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
937 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
938 | } |
939 | ||
940 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
941 | { | |
942 | u32 fsid[2]; | |
54775491 | 943 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
944 | dev_t dev = inode->i_sb->s_dev; |
945 | ||
946 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
947 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
948 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 949 | } |
af6a4e28 N |
950 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
951 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
952 | } |
953 | ||
954 | static void exp_unhash(struct svc_export *exp) | |
955 | { | |
956 | struct svc_expkey *ek; | |
54775491 | 957 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
958 | |
959 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
2d3bb252 | 960 | if (!IS_ERR(ek)) { |
1da177e4 | 961 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 962 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
963 | } |
964 | svc_expkey_cache.nextcheck = get_seconds(); | |
965 | } | |
966 | ||
967 | /* | |
968 | * Export a file system. | |
969 | */ | |
970 | int | |
971 | exp_export(struct nfsctl_export *nxp) | |
972 | { | |
973 | svc_client *clp; | |
974 | struct svc_export *exp = NULL; | |
975 | struct svc_export new; | |
976 | struct svc_expkey *fsid_key = NULL; | |
a63bb996 | 977 | struct path path; |
1da177e4 LT |
978 | int err; |
979 | ||
980 | /* Consistency check */ | |
981 | err = -EINVAL; | |
982 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
983 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
984 | goto out; | |
985 | ||
986 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
987 | nxp->ex_client, nxp->ex_path, | |
988 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
989 | nxp->ex_flags); | |
990 | ||
991 | /* Try to lock the export table for update */ | |
992 | exp_writelock(); | |
993 | ||
994 | /* Look up client info */ | |
995 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
996 | goto out_unlock; | |
997 | ||
998 | ||
999 | /* Look up the dentry */ | |
a63bb996 | 1000 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 | 1001 | if (err) |
53e6d8d1 | 1002 | goto out_put_clp; |
1da177e4 LT |
1003 | err = -EINVAL; |
1004 | ||
55430e2e | 1005 | exp = exp_get_by_name(clp, &path, NULL); |
1da177e4 | 1006 | |
f988443a N |
1007 | memset(&new, 0, sizeof(new)); |
1008 | ||
1da177e4 LT |
1009 | /* must make sure there won't be an ex_fsid clash */ |
1010 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
2d3bb252 | 1011 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
e83aece3 | 1012 | fsid_key->ek_path.mnt && |
a63bb996 AV |
1013 | (fsid_key->ek_path.mnt != path.mnt || |
1014 | fsid_key->ek_path.dentry != path.dentry)) | |
1da177e4 LT |
1015 | goto finish; |
1016 | ||
2d3bb252 | 1017 | if (!IS_ERR(exp)) { |
1da177e4 LT |
1018 | /* just a flags/id/fsid update */ |
1019 | ||
1020 | exp_fsid_unhash(exp); | |
1021 | exp->ex_flags = nxp->ex_flags; | |
1022 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1023 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1024 | exp->ex_fsid = nxp->ex_dev; | |
1025 | ||
1026 | err = exp_fsid_hash(clp, exp); | |
1027 | goto finish; | |
1028 | } | |
1029 | ||
a63bb996 | 1030 | err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL); |
1da177e4 LT |
1031 | if (err) goto finish; |
1032 | ||
1033 | err = -ENOMEM; | |
1034 | ||
1035 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1036 | ||
1037 | new.h.expiry_time = NEVER; | |
1038 | new.h.flags = 0; | |
54775491 JB |
1039 | new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL); |
1040 | if (!new.ex_pathname) | |
f988443a | 1041 | goto finish; |
1da177e4 | 1042 | new.ex_client = clp; |
a63bb996 | 1043 | new.ex_path = path; |
1da177e4 LT |
1044 | new.ex_flags = nxp->ex_flags; |
1045 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1046 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1047 | new.ex_fsid = nxp->ex_dev; | |
1048 | ||
4f7774c3 N |
1049 | exp = svc_export_lookup(&new); |
1050 | if (exp) | |
1051 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1052 | |
4f7774c3 | 1053 | if (!exp) |
1da177e4 LT |
1054 | goto finish; |
1055 | ||
1da177e4 LT |
1056 | if (exp_hash(clp, exp) || |
1057 | exp_fsid_hash(clp, exp)) { | |
1058 | /* failed to create at least one index */ | |
1059 | exp_do_unexport(exp); | |
1060 | cache_flush(); | |
f988443a N |
1061 | } else |
1062 | err = 0; | |
1da177e4 | 1063 | finish: |
54775491 | 1064 | kfree(new.ex_pathname); |
1da177e4 LT |
1065 | if (exp) |
1066 | exp_put(exp); | |
1067 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 1068 | cache_put(&fsid_key->h, &svc_expkey_cache); |
a63bb996 | 1069 | path_put(&path); |
53e6d8d1 JL |
1070 | out_put_clp: |
1071 | auth_domain_put(clp); | |
1da177e4 LT |
1072 | out_unlock: |
1073 | exp_writeunlock(); | |
1074 | out: | |
1075 | return err; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * Unexport a file system. The export entry has already | |
1080 | * been removed from the client's list of exported fs's. | |
1081 | */ | |
1082 | static void | |
1083 | exp_do_unexport(svc_export *unexp) | |
1084 | { | |
1085 | unexp->h.expiry_time = get_seconds()-1; | |
1086 | svc_export_cache.nextcheck = get_seconds(); | |
1087 | exp_unhash(unexp); | |
1088 | exp_fsid_unhash(unexp); | |
1089 | } | |
1090 | ||
1091 | ||
1092 | /* | |
1093 | * unexport syscall. | |
1094 | */ | |
1095 | int | |
1096 | exp_unexport(struct nfsctl_export *nxp) | |
1097 | { | |
1098 | struct auth_domain *dom; | |
1099 | svc_export *exp; | |
a63bb996 | 1100 | struct path path; |
1da177e4 LT |
1101 | int err; |
1102 | ||
1103 | /* Consistency check */ | |
1104 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1105 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1106 | return -EINVAL; | |
1107 | ||
1108 | exp_writelock(); | |
1109 | ||
1110 | err = -EINVAL; | |
1111 | dom = auth_domain_find(nxp->ex_client); | |
1112 | if (!dom) { | |
1113 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1114 | goto out_unlock; | |
1115 | } | |
1116 | ||
a63bb996 | 1117 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 LT |
1118 | if (err) |
1119 | goto out_domain; | |
1120 | ||
1121 | err = -EINVAL; | |
55430e2e | 1122 | exp = exp_get_by_name(dom, &path, NULL); |
a63bb996 | 1123 | path_put(&path); |
2d3bb252 | 1124 | if (IS_ERR(exp)) |
1da177e4 LT |
1125 | goto out_domain; |
1126 | ||
1127 | exp_do_unexport(exp); | |
1128 | exp_put(exp); | |
1129 | err = 0; | |
1130 | ||
1131 | out_domain: | |
1132 | auth_domain_put(dom); | |
1133 | cache_flush(); | |
1134 | out_unlock: | |
1135 | exp_writeunlock(); | |
1136 | return err; | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Obtain the root fh on behalf of a client. | |
1141 | * This could be done in user space, but I feel that it adds some safety | |
1142 | * since its harder to fool a kernel module than a user space program. | |
1143 | */ | |
1144 | int | |
a63bb996 | 1145 | exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
1146 | { |
1147 | struct svc_export *exp; | |
a63bb996 | 1148 | struct path path; |
1da177e4 LT |
1149 | struct inode *inode; |
1150 | struct svc_fh fh; | |
1151 | int err; | |
1152 | ||
1153 | err = -EPERM; | |
1154 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
1155 | if (kern_path(name, 0, &path)) { |
1156 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
1157 | return err; |
1158 | } | |
a63bb996 | 1159 | inode = path.dentry->d_inode; |
1da177e4 LT |
1160 | |
1161 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 1162 | name, path.dentry, clp->name, |
1da177e4 | 1163 | inode->i_sb->s_id, inode->i_ino); |
5bf3bd2b | 1164 | exp = exp_parent(clp, &path); |
4b41bd85 BF |
1165 | if (IS_ERR(exp)) { |
1166 | err = PTR_ERR(exp); | |
1167 | goto out; | |
1168 | } | |
1da177e4 LT |
1169 | |
1170 | /* | |
1171 | * fh must be initialized before calling fh_compose | |
1172 | */ | |
1173 | fh_init(&fh, maxsize); | |
a63bb996 | 1174 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
1175 | err = -EINVAL; |
1176 | else | |
1177 | err = 0; | |
1178 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1179 | fh_put(&fh); | |
1180 | exp_put(exp); | |
1181 | out: | |
a63bb996 | 1182 | path_put(&path); |
1da177e4 LT |
1183 | return err; |
1184 | } | |
1185 | ||
cce76f9b AB |
1186 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, |
1187 | u32 *fsidv, struct cache_req *reqp) | |
eab7e2e6 N |
1188 | { |
1189 | struct svc_export *exp; | |
1190 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 1191 | if (IS_ERR(ek)) |
e231c2ee | 1192 | return ERR_CAST(ek); |
eab7e2e6 | 1193 | |
55430e2e | 1194 | exp = exp_get_by_name(clp, &ek->ek_path, reqp); |
baab935f | 1195 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 1196 | |
2d3bb252 | 1197 | if (IS_ERR(exp)) |
e231c2ee | 1198 | return ERR_CAST(exp); |
eab7e2e6 N |
1199 | return exp; |
1200 | } | |
1201 | ||
32c1eb0c AA |
1202 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
1203 | { | |
1204 | struct exp_flavor_info *f; | |
1205 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1206 | ||
1207 | /* legacy gss-only clients are always OK: */ | |
1208 | if (exp->ex_client == rqstp->rq_gssclient) | |
1209 | return 0; | |
1210 | /* ip-address based client; check sec= export option: */ | |
1211 | for (f = exp->ex_flavors; f < end; f++) { | |
1212 | if (f->pseudoflavor == rqstp->rq_flavor) | |
1213 | return 0; | |
1214 | } | |
1215 | /* defaults in absence of sec= options: */ | |
1216 | if (exp->ex_nflavors == 0) { | |
1217 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
1218 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
1219 | return 0; | |
1220 | } | |
1221 | return nfserr_wrongsec; | |
1222 | } | |
1223 | ||
0989a788 | 1224 | /* |
2ea2209f BF |
1225 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1226 | * auth_unix client) if it's available and has secinfo information; | |
1227 | * otherwise, will try to use rq_gssclient. | |
1228 | * | |
0989a788 BF |
1229 | * Called from functions that handle requests; functions that do work on |
1230 | * behalf of mountd are passed a single client name to use, and should | |
1231 | * use exp_get_by_name() or exp_find(). | |
1232 | */ | |
1233 | struct svc_export * | |
91c9fa8f | 1234 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1235 | { |
9a25b96c | 1236 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1237 | |
1238 | if (rqstp->rq_client == NULL) | |
1239 | goto gss; | |
3ab4d8b1 | 1240 | |
2ea2209f | 1241 | /* First try the auth_unix client: */ |
91c9fa8f | 1242 | exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
1243 | if (PTR_ERR(exp) == -ENOENT) |
1244 | goto gss; | |
1245 | if (IS_ERR(exp)) | |
1246 | return exp; | |
1247 | /* If it has secinfo, assume there are no gss/... clients */ | |
1248 | if (exp->ex_nflavors > 0) | |
1249 | return exp; | |
1250 | gss: | |
1251 | /* Otherwise, try falling back on gss client */ | |
1252 | if (rqstp->rq_gssclient == NULL) | |
1253 | return exp; | |
91c9fa8f | 1254 | gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
1255 | if (PTR_ERR(gssexp) == -ENOENT) |
1256 | return exp; | |
9a25b96c | 1257 | if (!IS_ERR(exp)) |
2ea2209f BF |
1258 | exp_put(exp); |
1259 | return gssexp; | |
0989a788 BF |
1260 | } |
1261 | ||
1262 | struct svc_export * | |
1263 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1264 | { | |
9a25b96c | 1265 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1266 | |
1267 | if (rqstp->rq_client == NULL) | |
1268 | goto gss; | |
3ab4d8b1 | 1269 | |
2ea2209f BF |
1270 | /* First try the auth_unix client: */ |
1271 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
1272 | if (PTR_ERR(exp) == -ENOENT) | |
1273 | goto gss; | |
1274 | if (IS_ERR(exp)) | |
1275 | return exp; | |
1276 | /* If it has secinfo, assume there are no gss/... clients */ | |
1277 | if (exp->ex_nflavors > 0) | |
1278 | return exp; | |
1279 | gss: | |
1280 | /* Otherwise, try falling back on gss client */ | |
1281 | if (rqstp->rq_gssclient == NULL) | |
1282 | return exp; | |
1283 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
1284 | &rqstp->rq_chandle); | |
1285 | if (PTR_ERR(gssexp) == -ENOENT) | |
1286 | return exp; | |
9a25b96c | 1287 | if (!IS_ERR(exp)) |
2ea2209f BF |
1288 | exp_put(exp); |
1289 | return gssexp; | |
0989a788 BF |
1290 | } |
1291 | ||
1292 | struct svc_export * | |
e64c390c | 1293 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1294 | { |
e64c390c AV |
1295 | struct dentry *saved = dget(path->dentry); |
1296 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1297 | |
e64c390c AV |
1298 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1299 | struct dentry *parent = dget_parent(path->dentry); | |
1300 | dput(path->dentry); | |
1301 | path->dentry = parent; | |
1302 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1303 | } |
e64c390c AV |
1304 | dput(path->dentry); |
1305 | path->dentry = saved; | |
2ea2209f | 1306 | return exp; |
0989a788 | 1307 | } |
eab7e2e6 | 1308 | |
f39bde24 BF |
1309 | static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp) |
1310 | { | |
1311 | struct svc_export *exp; | |
1312 | u32 fsidv[2]; | |
1313 | ||
1314 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1315 | ||
1316 | exp = rqst_exp_find(rqstp, FSID_NUM, fsidv); | |
1317 | /* | |
1318 | * We shouldn't have accepting an nfsv4 request at all if we | |
1319 | * don't have a pseudoexport!: | |
1320 | */ | |
1321 | if (IS_ERR(exp) && PTR_ERR(exp) == -ENOENT) | |
1322 | exp = ERR_PTR(-ESERVERFAULT); | |
1323 | return exp; | |
1324 | } | |
1325 | ||
1da177e4 LT |
1326 | /* |
1327 | * Called when we need the filehandle for the root of the pseudofs, | |
1328 | * for a given NFSv4 client. The root is defined to be the | |
1329 | * export point with fsid==0 | |
1330 | */ | |
c7afef1f | 1331 | __be32 |
df547efb | 1332 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1333 | { |
eab7e2e6 | 1334 | struct svc_export *exp; |
c7afef1f | 1335 | __be32 rv; |
1da177e4 | 1336 | |
f39bde24 | 1337 | exp = find_fsidzero_export(rqstp); |
6899320c BF |
1338 | if (IS_ERR(exp)) |
1339 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1340 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
32c1eb0c AA |
1341 | if (rv) |
1342 | goto out; | |
1343 | rv = check_nfsd_access(exp, rqstp); | |
2671a4bf TM |
1344 | if (rv) |
1345 | fh_put(fhp); | |
32c1eb0c | 1346 | out: |
d0ebd9c0 | 1347 | exp_put(exp); |
1da177e4 LT |
1348 | return rv; |
1349 | } | |
1350 | ||
1351 | /* Iterator */ | |
1352 | ||
1353 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1354 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1355 | { |
1356 | loff_t n = *pos; | |
1357 | unsigned hash, export; | |
1358 | struct cache_head *ch; | |
1359 | ||
1360 | exp_readlock(); | |
1361 | read_lock(&svc_export_cache.hash_lock); | |
1362 | if (!n--) | |
bc6f02e5 | 1363 | return SEQ_START_TOKEN; |
1da177e4 LT |
1364 | hash = n >> 32; |
1365 | export = n & ((1LL<<32) - 1); | |
1366 | ||
1367 | ||
1368 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1369 | if (!export--) | |
1370 | return ch; | |
1371 | n &= ~((1LL<<32) - 1); | |
1372 | do { | |
1373 | hash++; | |
1374 | n += 1LL<<32; | |
1375 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1376 | if (hash >= EXPORT_HASHMAX) | |
1377 | return NULL; | |
1378 | *pos = n+1; | |
1379 | return export_table[hash]; | |
1380 | } | |
1381 | ||
1382 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1383 | { | |
1384 | struct cache_head *ch = p; | |
1385 | int hash = (*pos >> 32); | |
1386 | ||
bc6f02e5 | 1387 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1388 | hash = 0; |
1389 | else if (ch->next == NULL) { | |
1390 | hash++; | |
1391 | *pos += 1LL<<32; | |
1392 | } else { | |
1393 | ++*pos; | |
1394 | return ch->next; | |
1395 | } | |
1396 | *pos &= ~((1LL<<32) - 1); | |
1397 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1398 | hash++; | |
1399 | *pos += 1LL<<32; | |
1400 | } | |
1401 | if (hash >= EXPORT_HASHMAX) | |
1402 | return NULL; | |
1403 | ++*pos; | |
1404 | return export_table[hash]; | |
1405 | } | |
1406 | ||
1407 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1408 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1409 | { |
1410 | read_unlock(&svc_export_cache.hash_lock); | |
1411 | exp_readunlock(); | |
1412 | } | |
1413 | ||
1414 | static struct flags { | |
1415 | int flag; | |
1416 | char *name[2]; | |
1417 | } expflags[] = { | |
1418 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1419 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1420 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1421 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1422 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1423 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1424 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1425 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1426 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1427 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1428 | #ifdef MSNFS | |
1429 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1430 | #endif | |
1431 | { 0, {"", ""}} | |
1432 | }; | |
1433 | ||
ac34cdb0 | 1434 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1435 | { |
1da177e4 | 1436 | struct flags *flg; |
ac34cdb0 | 1437 | int state, first = 0; |
1da177e4 LT |
1438 | |
1439 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1440 | if (flg->flag & ~mask) |
1441 | continue; | |
1442 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1443 | if (*flg->name[state]) |
1444 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1445 | } | |
ac34cdb0 BF |
1446 | } |
1447 | ||
91fe39d3 BF |
1448 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1449 | { | |
1450 | seq_printf(m, ","); | |
1451 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1452 | } | |
1453 | ||
1454 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) | |
1455 | { | |
1456 | struct exp_flavor_info *f; | |
1457 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1458 | int lastflags = 0, first = 0; | |
1459 | ||
1460 | if (exp->ex_nflavors == 0) | |
1461 | return; | |
1462 | for (f = exp->ex_flavors; f < end; f++) { | |
1463 | if (first || f->flags != lastflags) { | |
1464 | if (!first) | |
1465 | show_secinfo_flags(m, lastflags); | |
1466 | seq_printf(m, ",sec=%d", f->pseudoflavor); | |
1467 | lastflags = f->flags; | |
1468 | } else { | |
1469 | seq_printf(m, ":%d", f->pseudoflavor); | |
1470 | } | |
1471 | } | |
1472 | show_secinfo_flags(m, lastflags); | |
1473 | } | |
1474 | ||
ac34cdb0 BF |
1475 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1476 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1477 | { | |
1478 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1479 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1480 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1481 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1482 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1483 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1484 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1485 | if (fsloc && fsloc->locations_count > 0) { |
1486 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1487 | int i; | |
1488 | ||
ac34cdb0 | 1489 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1490 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1491 | seq_putc(m, '@'); | |
1492 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1493 | for (i = 1; i < fsloc->locations_count; i++) { | |
1494 | seq_putc(m, ';'); | |
1495 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1496 | seq_putc(m, '@'); | |
1497 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1498 | } | |
1499 | } | |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | static int e_show(struct seq_file *m, void *p) | |
1503 | { | |
1504 | struct cache_head *cp = p; | |
1505 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1506 | |
bc6f02e5 | 1507 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1508 | seq_puts(m, "# Version 1.1\n"); |
1509 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1510 | return 0; | |
1511 | } | |
1512 | ||
1da177e4 LT |
1513 | cache_get(&exp->h); |
1514 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1515 | return 0; | |
baab935f | 1516 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1517 | return svc_export_show(m, &svc_export_cache, cp); |
1518 | } | |
1519 | ||
88e9d34c | 1520 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1521 | .start = e_start, |
1522 | .next = e_next, | |
1523 | .stop = e_stop, | |
1524 | .show = e_show, | |
1525 | }; | |
1526 | ||
1527 | /* | |
1528 | * Add or modify a client. | |
1529 | * Change requests may involve the list of host addresses. The list of | |
1530 | * exports and possibly existing uid maps are left untouched. | |
1531 | */ | |
1532 | int | |
1533 | exp_addclient(struct nfsctl_client *ncp) | |
1534 | { | |
1535 | struct auth_domain *dom; | |
1536 | int i, err; | |
f15364bd | 1537 | struct in6_addr addr6; |
1da177e4 LT |
1538 | |
1539 | /* First, consistency check. */ | |
1540 | err = -EINVAL; | |
1541 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1542 | goto out; | |
1543 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1544 | goto out; | |
1545 | ||
1546 | /* Lock the hashtable */ | |
1547 | exp_writelock(); | |
1548 | ||
1549 | dom = unix_domain_find(ncp->cl_ident); | |
1550 | ||
1551 | err = -ENOMEM; | |
1552 | if (!dom) | |
1553 | goto out_unlock; | |
1554 | ||
1555 | /* Insert client into hashtable. */ | |
f15364bd AC |
1556 | for (i = 0; i < ncp->cl_naddr; i++) { |
1557 | ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6); | |
1558 | auth_unix_add_addr(&addr6, dom); | |
1559 | } | |
1da177e4 LT |
1560 | auth_unix_forget_old(dom); |
1561 | auth_domain_put(dom); | |
1562 | ||
1563 | err = 0; | |
1564 | ||
1565 | out_unlock: | |
1566 | exp_writeunlock(); | |
1567 | out: | |
1568 | return err; | |
1569 | } | |
1570 | ||
1571 | /* | |
1572 | * Delete a client given an identifier. | |
1573 | */ | |
1574 | int | |
1575 | exp_delclient(struct nfsctl_client *ncp) | |
1576 | { | |
1577 | int err; | |
1578 | struct auth_domain *dom; | |
1579 | ||
1580 | err = -EINVAL; | |
1581 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1582 | goto out; | |
1583 | ||
1584 | /* Lock the hashtable */ | |
1585 | exp_writelock(); | |
1586 | ||
1587 | dom = auth_domain_find(ncp->cl_ident); | |
1588 | /* just make sure that no addresses work | |
1589 | * and that it will expire soon | |
1590 | */ | |
1591 | if (dom) { | |
1592 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1593 | auth_domain_put(dom); |
1594 | } | |
1595 | ||
1596 | exp_writeunlock(); | |
1597 | out: | |
1598 | return err; | |
1599 | } | |
1600 | ||
1601 | /* | |
1602 | * Verify that string is non-empty and does not exceed max length. | |
1603 | */ | |
1604 | static int | |
1605 | exp_verify_string(char *cp, int max) | |
1606 | { | |
1607 | int i; | |
1608 | ||
1609 | for (i = 0; i < max; i++) | |
1610 | if (!cp[i]) | |
1611 | return i; | |
1612 | cp[i] = 0; | |
1613 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1614 | return 0; | |
1615 | } | |
1616 | ||
1617 | /* | |
1618 | * Initialize the exports module. | |
1619 | */ | |
dbf847ec | 1620 | int |
1da177e4 LT |
1621 | nfsd_export_init(void) |
1622 | { | |
dbf847ec | 1623 | int rv; |
1da177e4 LT |
1624 | dprintk("nfsd: initializing export module.\n"); |
1625 | ||
dbf847ec BF |
1626 | rv = cache_register(&svc_export_cache); |
1627 | if (rv) | |
1628 | return rv; | |
1629 | rv = cache_register(&svc_expkey_cache); | |
1630 | if (rv) | |
1631 | cache_unregister(&svc_export_cache); | |
1632 | return rv; | |
1da177e4 LT |
1633 | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * Flush exports table - called when last nfsd thread is killed | |
1638 | */ | |
1639 | void | |
1640 | nfsd_export_flush(void) | |
1641 | { | |
1642 | exp_writelock(); | |
1643 | cache_purge(&svc_expkey_cache); | |
1644 | cache_purge(&svc_export_cache); | |
1645 | exp_writeunlock(); | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Shutdown the exports module. | |
1650 | */ | |
1651 | void | |
1652 | nfsd_export_shutdown(void) | |
1653 | { | |
1654 | ||
1655 | dprintk("nfsd: shutting down export module.\n"); | |
1656 | ||
1657 | exp_writelock(); | |
1658 | ||
df95a9d4 BF |
1659 | cache_unregister(&svc_expkey_cache); |
1660 | cache_unregister(&svc_export_cache); | |
1da177e4 LT |
1661 | svcauth_unix_purge(); |
1662 | ||
1663 | exp_writeunlock(); | |
1664 | dprintk("nfsd: export shutdown complete.\n"); | |
1665 | } |