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Commit | Line | Data |
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1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
1da177e4 LT |
3 | * NFS exporting and validation. |
4 | * | |
5 | * We maintain a list of clients, each of which has a list of | |
6 | * exports. To export an fs to a given client, you first have | |
7 | * to create the client entry with NFSCTL_ADDCLIENT, which | |
8 | * creates a client control block and adds it to the hash | |
9 | * table. Then, you call NFSCTL_EXPORT for each fs. | |
10 | * | |
11 | * | |
12 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> | |
13 | */ | |
14 | ||
1da177e4 | 15 | #include <linux/namei.h> |
f35279d3 | 16 | #include <linux/module.h> |
a5694255 | 17 | #include <linux/exportfs.h> |
1da177e4 | 18 | |
1da177e4 | 19 | #include <linux/nfsd/syscall.h> |
f15364bd | 20 | #include <net/ipv6.h> |
1da177e4 | 21 | |
9a74af21 | 22 | #include "nfsd.h" |
1557aca7 | 23 | #include "nfsfh.h" |
9a74af21 | 24 | |
1da177e4 | 25 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 LT |
26 | |
27 | typedef struct auth_domain svc_client; | |
28 | typedef struct svc_export svc_export; | |
29 | ||
30 | static void exp_do_unexport(svc_export *unexp); | |
31 | static int exp_verify_string(char *cp, int max); | |
32 | ||
33 | /* | |
34 | * We have two caches. | |
35 | * One maps client+vfsmnt+dentry to export options - the export map | |
36 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
37 | * | |
38 | * The export options are actually stored in the first map, and the | |
39 | * second map contains a reference to the entry in the first map. | |
40 | */ | |
41 | ||
42 | #define EXPKEY_HASHBITS 8 | |
43 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
44 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
45 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
46 | ||
74cae61a | 47 | static void expkey_put(struct kref *ref) |
1da177e4 | 48 | { |
baab935f N |
49 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
50 | ||
51 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
52 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
53 | path_put(&key->ek_path); | |
baab935f N |
54 | auth_domain_put(key->ek_client); |
55 | kfree(key); | |
1da177e4 LT |
56 | } |
57 | ||
58 | static void expkey_request(struct cache_detail *cd, | |
59 | struct cache_head *h, | |
60 | char **bpp, int *blen) | |
61 | { | |
62 | /* client fsidtype \xfsid */ | |
63 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
64 | char type[5]; | |
65 | ||
66 | qword_add(bpp, blen, ek->ek_client->name); | |
67 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
68 | qword_add(bpp, blen, type); | |
69 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
70 | (*bpp)[-1] = '\n'; | |
71 | } | |
72 | ||
bc74b4f5 TM |
73 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
74 | { | |
75 | return sunrpc_cache_pipe_upcall(cd, h, expkey_request); | |
76 | } | |
77 | ||
8d270f7f N |
78 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
79 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
74cae61a AB |
80 | static struct cache_detail svc_expkey_cache; |
81 | ||
1da177e4 LT |
82 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
83 | { | |
84 | /* client fsidtype fsid [path] */ | |
85 | char *buf; | |
86 | int len; | |
87 | struct auth_domain *dom = NULL; | |
88 | int err; | |
89 | int fsidtype; | |
90 | char *ep; | |
91 | struct svc_expkey key; | |
30bc4dfd | 92 | struct svc_expkey *ek = NULL; |
1da177e4 LT |
93 | |
94 | if (mesg[mlen-1] != '\n') | |
95 | return -EINVAL; | |
96 | mesg[mlen-1] = 0; | |
97 | ||
98 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
99 | err = -ENOMEM; | |
30bc4dfd BF |
100 | if (!buf) |
101 | goto out; | |
1da177e4 LT |
102 | |
103 | err = -EINVAL; | |
104 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
105 | goto out; | |
106 | ||
107 | err = -ENOENT; | |
108 | dom = auth_domain_find(buf); | |
109 | if (!dom) | |
110 | goto out; | |
111 | dprintk("found domain %s\n", buf); | |
112 | ||
113 | err = -EINVAL; | |
114 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
115 | goto out; | |
116 | fsidtype = simple_strtoul(buf, &ep, 10); | |
117 | if (*ep) | |
118 | goto out; | |
119 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 120 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
121 | goto out; |
122 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
123 | goto out; | |
124 | dprintk("found fsid length %d\n", len); | |
125 | if (len != key_len(fsidtype)) | |
126 | goto out; | |
127 | ||
128 | /* OK, we seem to have a valid key */ | |
129 | key.h.flags = 0; | |
130 | key.h.expiry_time = get_expiry(&mesg); | |
131 | if (key.h.expiry_time == 0) | |
132 | goto out; | |
133 | ||
134 | key.ek_client = dom; | |
135 | key.ek_fsidtype = fsidtype; | |
136 | memcpy(key.ek_fsid, buf, len); | |
137 | ||
8d270f7f N |
138 | ek = svc_expkey_lookup(&key); |
139 | err = -ENOMEM; | |
140 | if (!ek) | |
141 | goto out; | |
142 | ||
1da177e4 | 143 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 144 | err = -EINVAL; |
30bc4dfd BF |
145 | len = qword_get(&mesg, buf, PAGE_SIZE); |
146 | if (len < 0) | |
1da177e4 LT |
147 | goto out; |
148 | dprintk("Path seems to be <%s>\n", buf); | |
149 | err = 0; | |
150 | if (len == 0) { | |
1da177e4 | 151 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 152 | ek = svc_expkey_update(&key, ek); |
30bc4dfd BF |
153 | if (!ek) |
154 | err = -ENOMEM; | |
1da177e4 | 155 | } else { |
a63bb996 | 156 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 157 | if (err) |
1da177e4 LT |
158 | goto out; |
159 | ||
160 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 161 | |
8d270f7f | 162 | ek = svc_expkey_update(&key, ek); |
30bc4dfd | 163 | if (!ek) |
8d270f7f | 164 | err = -ENOMEM; |
a63bb996 | 165 | path_put(&key.ek_path); |
1da177e4 LT |
166 | } |
167 | cache_flush(); | |
168 | out: | |
30bc4dfd BF |
169 | if (ek) |
170 | cache_put(&ek->h, &svc_expkey_cache); | |
1da177e4 LT |
171 | if (dom) |
172 | auth_domain_put(dom); | |
f99d49ad | 173 | kfree(buf); |
1da177e4 LT |
174 | return err; |
175 | } | |
176 | ||
177 | static int expkey_show(struct seq_file *m, | |
178 | struct cache_detail *cd, | |
179 | struct cache_head *h) | |
180 | { | |
181 | struct svc_expkey *ek ; | |
af6a4e28 | 182 | int i; |
1da177e4 LT |
183 | |
184 | if (h ==NULL) { | |
185 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
186 | return 0; | |
187 | } | |
188 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
189 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
190 | ek->ek_fsidtype); | |
191 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
192 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
193 | if (test_bit(CACHE_VALID, &h->flags) && |
194 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
195 | seq_printf(m, " "); | |
c32c2f63 | 196 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
197 | } |
198 | seq_printf(m, "\n"); | |
199 | return 0; | |
200 | } | |
1da177e4 | 201 | |
8d270f7f | 202 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 203 | { |
8d270f7f N |
204 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
205 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
206 | ||
207 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
208 | orig->ek_client != new->ek_client || | |
209 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
210 | return 0; |
211 | return 1; | |
212 | } | |
213 | ||
8d270f7f N |
214 | static inline void expkey_init(struct cache_head *cnew, |
215 | struct cache_head *citem) | |
1da177e4 | 216 | { |
8d270f7f N |
217 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
218 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
219 | ||
efc36aa5 | 220 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
221 | new->ek_client = item->ek_client; |
222 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
223 | |
224 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
225 | } |
226 | ||
8d270f7f N |
227 | static inline void expkey_update(struct cache_head *cnew, |
228 | struct cache_head *citem) | |
1da177e4 | 229 | { |
8d270f7f N |
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 | ||
e83aece3 JB |
233 | new->ek_path = item->ek_path; |
234 | path_get(&item->ek_path); | |
1da177e4 LT |
235 | } |
236 | ||
8d270f7f N |
237 | static struct cache_head *expkey_alloc(void) |
238 | { | |
239 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
240 | if (i) | |
241 | return &i->h; | |
242 | else | |
243 | return NULL; | |
244 | } | |
245 | ||
74cae61a | 246 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
247 | .owner = THIS_MODULE, |
248 | .hash_size = EXPKEY_HASHMAX, | |
249 | .hash_table = expkey_table, | |
250 | .name = "nfsd.fh", | |
251 | .cache_put = expkey_put, | |
bc74b4f5 | 252 | .cache_upcall = expkey_upcall, |
8d270f7f N |
253 | .cache_parse = expkey_parse, |
254 | .cache_show = expkey_show, | |
255 | .match = expkey_match, | |
256 | .init = expkey_init, | |
257 | .update = expkey_update, | |
258 | .alloc = expkey_alloc, | |
259 | }; | |
260 | ||
61f8603d N |
261 | static int |
262 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 263 | { |
8d270f7f N |
264 | int hash = item->ek_fsidtype; |
265 | char * cp = (char*)item->ek_fsid; | |
266 | int len = key_len(item->ek_fsidtype); | |
267 | ||
268 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
269 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
270 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
271 | return hash; |
272 | } | |
273 | ||
274 | static struct svc_expkey * | |
275 | svc_expkey_lookup(struct svc_expkey *item) | |
276 | { | |
277 | struct cache_head *ch; | |
278 | int hash = svc_expkey_hash(item); | |
8d270f7f N |
279 | |
280 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
281 | hash); | |
282 | if (ch) | |
283 | return container_of(ch, struct svc_expkey, h); | |
284 | else | |
285 | return NULL; | |
286 | } | |
287 | ||
288 | static struct svc_expkey * | |
289 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
290 | { | |
291 | struct cache_head *ch; | |
61f8603d | 292 | int hash = svc_expkey_hash(new); |
8d270f7f N |
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 | |
774b1478 | 358 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
359 | { |
360 | ||
f2ca7153 BF |
361 | /* |
362 | * We currently export only dirs, regular files, and (for v4 | |
363 | * pseudoroot) symlinks. | |
1da177e4 LT |
364 | */ |
365 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 366 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
367 | !S_ISREG(inode->i_mode)) |
368 | return -ENOTDIR; | |
369 | ||
774b1478 BF |
370 | /* |
371 | * Mountd should never pass down a writeable V4ROOT export, but, | |
372 | * just to make sure: | |
373 | */ | |
374 | if (*flags & NFSEXP_V4ROOT) | |
375 | *flags |= NFSEXP_READONLY; | |
376 | ||
1da177e4 LT |
377 | /* There are two requirements on a filesystem to be exportable. |
378 | * 1: We must be able to identify the filesystem from a number. | |
379 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 380 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
381 | * 2: We must be able to find an inode from a filehandle. |
382 | * This means that s_export_op must be set. | |
383 | */ | |
384 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 385 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 386 | uuid == NULL) { |
3e3b4800 | 387 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
388 | return -EINVAL; |
389 | } | |
cfaea787 CH |
390 | |
391 | if (!inode->i_sb->s_export_op || | |
392 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
393 | dprintk("exp_export: export of invalid fs type.\n"); |
394 | return -EINVAL; | |
395 | } | |
396 | ||
1da177e4 LT |
397 | return 0; |
398 | ||
399 | } | |
400 | ||
93346919 MN |
401 | #ifdef CONFIG_NFSD_V4 |
402 | ||
403 | static int | |
404 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
405 | { | |
406 | int len; | |
407 | int migrated, i, err; | |
408 | ||
93346919 MN |
409 | /* listsize */ |
410 | err = get_int(mesg, &fsloc->locations_count); | |
411 | if (err) | |
412 | return err; | |
413 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
414 | return -EINVAL; | |
415 | if (fsloc->locations_count == 0) | |
416 | return 0; | |
417 | ||
418 | fsloc->locations = kzalloc(fsloc->locations_count | |
419 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
420 | if (!fsloc->locations) | |
421 | return -ENOMEM; | |
422 | for (i=0; i < fsloc->locations_count; i++) { | |
423 | /* colon separated host list */ | |
424 | err = -EINVAL; | |
425 | len = qword_get(mesg, buf, PAGE_SIZE); | |
426 | if (len <= 0) | |
427 | goto out_free_all; | |
428 | err = -ENOMEM; | |
429 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
430 | if (!fsloc->locations[i].hosts) | |
431 | goto out_free_all; | |
432 | err = -EINVAL; | |
433 | /* slash separated path component list */ | |
434 | len = qword_get(mesg, buf, PAGE_SIZE); | |
435 | if (len <= 0) | |
436 | goto out_free_all; | |
437 | err = -ENOMEM; | |
438 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
439 | if (!fsloc->locations[i].path) | |
440 | goto out_free_all; | |
441 | } | |
442 | /* migrated */ | |
443 | err = get_int(mesg, &migrated); | |
444 | if (err) | |
445 | goto out_free_all; | |
446 | err = -EINVAL; | |
447 | if (migrated < 0 || migrated > 1) | |
448 | goto out_free_all; | |
449 | fsloc->migrated = migrated; | |
450 | return 0; | |
451 | out_free_all: | |
452 | nfsd4_fslocs_free(fsloc); | |
453 | return err; | |
454 | } | |
455 | ||
e677bfe4 AA |
456 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
457 | { | |
458 | int listsize, err; | |
459 | struct exp_flavor_info *f; | |
460 | ||
461 | err = get_int(mesg, &listsize); | |
462 | if (err) | |
463 | return err; | |
464 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
465 | return -EINVAL; | |
466 | ||
467 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
468 | err = get_int(mesg, &f->pseudoflavor); | |
469 | if (err) | |
470 | return err; | |
471 | /* | |
80492e7d RK |
472 | * XXX: It would be nice to also check whether this |
473 | * pseudoflavor is supported, so we can discover the | |
474 | * problem at export time instead of when a client fails | |
475 | * to authenticate. | |
e677bfe4 | 476 | */ |
e677bfe4 AA |
477 | err = get_int(mesg, &f->flags); |
478 | if (err) | |
479 | return err; | |
480 | /* Only some flags are allowed to differ between flavors: */ | |
481 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
482 | return -EINVAL; | |
483 | } | |
484 | exp->ex_nflavors = listsize; | |
485 | return 0; | |
486 | } | |
487 | ||
93346919 | 488 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
489 | static inline int |
490 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
491 | static inline int | |
492 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
493 | #endif |
494 | ||
1da177e4 LT |
495 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
496 | { | |
497 | /* client path expiry [flags anonuid anongid fsid] */ | |
498 | char *buf; | |
499 | int len; | |
500 | int err; | |
501 | struct auth_domain *dom = NULL; | |
c1a2a475 | 502 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
503 | int an_int; |
504 | ||
1da177e4 LT |
505 | if (mesg[mlen-1] != '\n') |
506 | return -EINVAL; | |
507 | mesg[mlen-1] = 0; | |
508 | ||
509 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
510 | if (!buf) |
511 | return -ENOMEM; | |
1da177e4 LT |
512 | |
513 | /* client */ | |
1da177e4 | 514 | err = -EINVAL; |
c1a2a475 AV |
515 | len = qword_get(&mesg, buf, PAGE_SIZE); |
516 | if (len <= 0) | |
517 | goto out; | |
1da177e4 LT |
518 | |
519 | err = -ENOENT; | |
520 | dom = auth_domain_find(buf); | |
521 | if (!dom) | |
522 | goto out; | |
523 | ||
524 | /* path */ | |
525 | err = -EINVAL; | |
c1a2a475 AV |
526 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
527 | goto out1; | |
528 | ||
529 | err = kern_path(buf, 0, &exp.ex_path); | |
530 | if (err) | |
531 | goto out1; | |
1da177e4 | 532 | |
1da177e4 | 533 | exp.ex_client = dom; |
c1a2a475 | 534 | |
b009a873 | 535 | err = -ENOMEM; |
c1a2a475 | 536 | exp.ex_pathname = kstrdup(buf, GFP_KERNEL); |
54775491 | 537 | if (!exp.ex_pathname) |
c1a2a475 | 538 | goto out2; |
1da177e4 LT |
539 | |
540 | /* expiry */ | |
541 | err = -EINVAL; | |
542 | exp.h.expiry_time = get_expiry(&mesg); | |
543 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 544 | goto out3; |
1da177e4 LT |
545 | |
546 | /* flags */ | |
547 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
548 | if (err == -ENOENT) { |
549 | err = 0; | |
1da177e4 | 550 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 551 | } else { |
c1a2a475 AV |
552 | if (err || an_int < 0) |
553 | goto out3; | |
1da177e4 LT |
554 | exp.ex_flags= an_int; |
555 | ||
556 | /* anon uid */ | |
557 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
558 | if (err) |
559 | goto out3; | |
1da177e4 LT |
560 | exp.ex_anon_uid= an_int; |
561 | ||
562 | /* anon gid */ | |
563 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
564 | if (err) |
565 | goto out3; | |
1da177e4 LT |
566 | exp.ex_anon_gid= an_int; |
567 | ||
568 | /* fsid */ | |
569 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
570 | if (err) |
571 | goto out3; | |
1da177e4 LT |
572 | exp.ex_fsid = an_int; |
573 | ||
af6a4e28 N |
574 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
575 | if (strcmp(buf, "fsloc") == 0) | |
576 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
577 | else if (strcmp(buf, "uuid") == 0) { | |
578 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
579 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
580 | if (len != 16) | |
581 | err = -EINVAL; | |
582 | else { | |
583 | exp.ex_uuid = | |
584 | kmemdup(buf, 16, GFP_KERNEL); | |
585 | if (exp.ex_uuid == NULL) | |
586 | err = -ENOMEM; | |
587 | } | |
e677bfe4 AA |
588 | } else if (strcmp(buf, "secinfo") == 0) |
589 | err = secinfo_parse(&mesg, buf, &exp); | |
590 | else | |
af6a4e28 N |
591 | /* quietly ignore unknown words and anything |
592 | * following. Newer user-space can try to set | |
593 | * new values, then see what the result was. | |
594 | */ | |
595 | break; | |
596 | if (err) | |
c1a2a475 | 597 | goto out4; |
af6a4e28 | 598 | } |
93346919 | 599 | |
774b1478 | 600 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 601 | exp.ex_uuid); |
c1a2a475 AV |
602 | if (err) |
603 | goto out4; | |
1da177e4 LT |
604 | } |
605 | ||
4f7774c3 | 606 | expp = svc_export_lookup(&exp); |
1da177e4 | 607 | if (expp) |
4f7774c3 N |
608 | expp = svc_export_update(&exp, expp); |
609 | else | |
610 | err = -ENOMEM; | |
1da177e4 | 611 | cache_flush(); |
4f7774c3 N |
612 | if (expp == NULL) |
613 | err = -ENOMEM; | |
614 | else | |
615 | exp_put(expp); | |
c1a2a475 | 616 | out4: |
af6a4e28 N |
617 | nfsd4_fslocs_free(&exp.ex_fslocs); |
618 | kfree(exp.ex_uuid); | |
c1a2a475 | 619 | out3: |
54775491 | 620 | kfree(exp.ex_pathname); |
c1a2a475 AV |
621 | out2: |
622 | path_put(&exp.ex_path); | |
623 | out1: | |
624 | auth_domain_put(dom); | |
625 | out: | |
f99d49ad | 626 | kfree(buf); |
1da177e4 LT |
627 | return err; |
628 | } | |
629 | ||
93346919 MN |
630 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
631 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
91fe39d3 | 632 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
633 | |
634 | static int svc_export_show(struct seq_file *m, | |
635 | struct cache_detail *cd, | |
636 | struct cache_head *h) | |
637 | { | |
638 | struct svc_export *exp ; | |
639 | ||
640 | if (h ==NULL) { | |
641 | seq_puts(m, "#path domain(flags)\n"); | |
642 | return 0; | |
643 | } | |
644 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 645 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
646 | seq_putc(m, '\t'); |
647 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
648 | seq_putc(m, '('); | |
649 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 650 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
651 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
652 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
653 | if (exp->ex_uuid) { |
654 | int i; | |
655 | seq_puts(m, ",uuid="); | |
656 | for (i=0; i<16; i++) { | |
657 | if ((i&3) == 0 && i) | |
658 | seq_putc(m, ':'); | |
659 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
660 | } | |
661 | } | |
91fe39d3 | 662 | show_secinfo(m, exp); |
af6a4e28 | 663 | } |
1da177e4 LT |
664 | seq_puts(m, ")\n"); |
665 | return 0; | |
666 | } | |
4f7774c3 | 667 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 668 | { |
4f7774c3 N |
669 | struct svc_export *orig = container_of(a, struct svc_export, h); |
670 | struct svc_export *new = container_of(b, struct svc_export, h); | |
671 | return orig->ex_client == new->ex_client && | |
54775491 JB |
672 | orig->ex_path.dentry == new->ex_path.dentry && |
673 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 674 | } |
4f7774c3 N |
675 | |
676 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 677 | { |
4f7774c3 N |
678 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
679 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
680 | ||
efc36aa5 | 681 | kref_get(&item->ex_client->ref); |
1da177e4 | 682 | new->ex_client = item->ex_client; |
54775491 JB |
683 | new->ex_path.dentry = dget(item->ex_path.dentry); |
684 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
685 | new->ex_pathname = NULL; | |
93346919 MN |
686 | new->ex_fslocs.locations = NULL; |
687 | new->ex_fslocs.locations_count = 0; | |
688 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
689 | } |
690 | ||
4f7774c3 | 691 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 692 | { |
4f7774c3 N |
693 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
694 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 695 | int i; |
4f7774c3 | 696 | |
1da177e4 LT |
697 | new->ex_flags = item->ex_flags; |
698 | new->ex_anon_uid = item->ex_anon_uid; | |
699 | new->ex_anon_gid = item->ex_anon_gid; | |
700 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
701 | new->ex_uuid = item->ex_uuid; |
702 | item->ex_uuid = NULL; | |
54775491 JB |
703 | new->ex_pathname = item->ex_pathname; |
704 | item->ex_pathname = NULL; | |
93346919 MN |
705 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
706 | item->ex_fslocs.locations = NULL; | |
707 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
708 | item->ex_fslocs.locations_count = 0; | |
709 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
710 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
711 | new->ex_nflavors = item->ex_nflavors; |
712 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
713 | new->ex_flavors[i] = item->ex_flavors[i]; | |
714 | } | |
1da177e4 LT |
715 | } |
716 | ||
4f7774c3 N |
717 | static struct cache_head *svc_export_alloc(void) |
718 | { | |
719 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
720 | if (i) | |
721 | return &i->h; | |
722 | else | |
723 | return NULL; | |
724 | } | |
725 | ||
726 | struct cache_detail svc_export_cache = { | |
727 | .owner = THIS_MODULE, | |
728 | .hash_size = EXPORT_HASHMAX, | |
729 | .hash_table = export_table, | |
730 | .name = "nfsd.export", | |
731 | .cache_put = svc_export_put, | |
bc74b4f5 | 732 | .cache_upcall = svc_export_upcall, |
4f7774c3 N |
733 | .cache_parse = svc_export_parse, |
734 | .cache_show = svc_export_show, | |
735 | .match = svc_export_match, | |
736 | .init = svc_export_init, | |
737 | .update = export_update, | |
738 | .alloc = svc_export_alloc, | |
739 | }; | |
740 | ||
61f8603d N |
741 | static int |
742 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 743 | { |
4f7774c3 | 744 | int hash; |
61f8603d | 745 | |
4f7774c3 | 746 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
747 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
748 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
749 | return hash; |
750 | } | |
751 | ||
752 | static struct svc_export * | |
753 | svc_export_lookup(struct svc_export *exp) | |
754 | { | |
755 | struct cache_head *ch; | |
756 | int hash = svc_export_hash(exp); | |
4f7774c3 N |
757 | |
758 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
759 | hash); | |
760 | if (ch) | |
761 | return container_of(ch, struct svc_export, h); | |
762 | else | |
763 | return NULL; | |
764 | } | |
765 | ||
74cae61a | 766 | static struct svc_export * |
4f7774c3 N |
767 | svc_export_update(struct svc_export *new, struct svc_export *old) |
768 | { | |
769 | struct cache_head *ch; | |
61f8603d | 770 | int hash = svc_export_hash(old); |
4f7774c3 N |
771 | |
772 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
773 | &old->h, | |
774 | hash); | |
775 | if (ch) | |
776 | return container_of(ch, struct svc_export, h); | |
777 | else | |
778 | return NULL; | |
779 | } | |
1da177e4 LT |
780 | |
781 | ||
74cae61a | 782 | static struct svc_expkey * |
1da177e4 LT |
783 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
784 | { | |
785 | struct svc_expkey key, *ek; | |
786 | int err; | |
787 | ||
788 | if (!clp) | |
2d3bb252 | 789 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
790 | |
791 | key.ek_client = clp; | |
792 | key.ek_fsidtype = fsid_type; | |
793 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
794 | ||
8d270f7f | 795 | ek = svc_expkey_lookup(&key); |
2d3bb252 BF |
796 | if (ek == NULL) |
797 | return ERR_PTR(-ENOMEM); | |
798 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
799 | if (err) | |
800 | return ERR_PTR(err); | |
1da177e4 LT |
801 | return ek; |
802 | } | |
803 | ||
804 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
805 | struct svc_export *exp) | |
806 | { | |
807 | struct svc_expkey key, *ek; | |
808 | ||
809 | key.ek_client = clp; | |
810 | key.ek_fsidtype = fsid_type; | |
811 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
e83aece3 | 812 | key.ek_path = exp->ex_path; |
1da177e4 LT |
813 | key.h.expiry_time = NEVER; |
814 | key.h.flags = 0; | |
815 | ||
8d270f7f N |
816 | ek = svc_expkey_lookup(&key); |
817 | if (ek) | |
818 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 819 | if (ek) { |
baab935f | 820 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
821 | return 0; |
822 | } | |
823 | return -ENOMEM; | |
824 | } | |
825 | ||
826 | /* | |
827 | * Find the client's export entry matching xdev/xino. | |
828 | */ | |
829 | static inline struct svc_expkey * | |
830 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
831 | { | |
832 | u32 fsidv[3]; | |
833 | ||
834 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
835 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
836 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 837 | } |
af6a4e28 N |
838 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
839 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
840 | } |
841 | ||
842 | /* | |
843 | * Find the client's export entry matching fsid | |
844 | */ | |
845 | static inline struct svc_expkey * | |
846 | exp_get_fsid_key(svc_client *clp, int fsid) | |
847 | { | |
848 | u32 fsidv[2]; | |
849 | ||
af6a4e28 | 850 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 851 | |
af6a4e28 | 852 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
853 | } |
854 | ||
55430e2e AV |
855 | static svc_export *exp_get_by_name(svc_client *clp, const struct path *path, |
856 | struct cache_req *reqp) | |
1da177e4 LT |
857 | { |
858 | struct svc_export *exp, key; | |
2d3bb252 | 859 | int err; |
e83aece3 | 860 | |
1da177e4 | 861 | if (!clp) |
2d3bb252 | 862 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
863 | |
864 | key.ex_client = clp; | |
55430e2e | 865 | key.ex_path = *path; |
1da177e4 | 866 | |
4f7774c3 | 867 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
868 | if (exp == NULL) |
869 | return ERR_PTR(-ENOMEM); | |
870 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
871 | if (err) | |
872 | return ERR_PTR(err); | |
1da177e4 LT |
873 | return exp; |
874 | } | |
875 | ||
876 | /* | |
877 | * Find the export entry for a given dentry. | |
878 | */ | |
5bf3bd2b | 879 | static struct svc_export *exp_parent(svc_client *clp, struct path *path) |
1da177e4 | 880 | { |
5bf3bd2b AV |
881 | struct dentry *saved = dget(path->dentry); |
882 | svc_export *exp = exp_get_by_name(clp, path, NULL); | |
883 | ||
884 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
885 | struct dentry *parent = dget_parent(path->dentry); | |
886 | dput(path->dentry); | |
887 | path->dentry = parent; | |
888 | exp = exp_get_by_name(clp, path, NULL); | |
1da177e4 | 889 | } |
5bf3bd2b AV |
890 | dput(path->dentry); |
891 | path->dentry = saved; | |
1da177e4 LT |
892 | return exp; |
893 | } | |
894 | ||
895 | /* | |
896 | * Hashtable locking. Write locks are placed only by user processes | |
897 | * wanting to modify export information. | |
898 | * Write locking only done in this file. Read locking | |
899 | * needed externally. | |
900 | */ | |
901 | ||
902 | static DECLARE_RWSEM(hash_sem); | |
903 | ||
904 | void | |
905 | exp_readlock(void) | |
906 | { | |
907 | down_read(&hash_sem); | |
908 | } | |
909 | ||
910 | static inline void | |
911 | exp_writelock(void) | |
912 | { | |
913 | down_write(&hash_sem); | |
914 | } | |
915 | ||
916 | void | |
917 | exp_readunlock(void) | |
918 | { | |
919 | up_read(&hash_sem); | |
920 | } | |
921 | ||
922 | static inline void | |
923 | exp_writeunlock(void) | |
924 | { | |
925 | up_write(&hash_sem); | |
926 | } | |
927 | ||
928 | static void exp_fsid_unhash(struct svc_export *exp) | |
929 | { | |
930 | struct svc_expkey *ek; | |
931 | ||
932 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
933 | return; | |
934 | ||
935 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
2d3bb252 | 936 | if (!IS_ERR(ek)) { |
1da177e4 | 937 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 938 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
939 | } |
940 | svc_expkey_cache.nextcheck = get_seconds(); | |
941 | } | |
942 | ||
943 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
944 | { | |
945 | u32 fsid[2]; | |
946 | ||
947 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
948 | return 0; | |
949 | ||
af6a4e28 N |
950 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
951 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
952 | } |
953 | ||
954 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
955 | { | |
956 | u32 fsid[2]; | |
54775491 | 957 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
958 | dev_t dev = inode->i_sb->s_dev; |
959 | ||
960 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
961 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
962 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 963 | } |
af6a4e28 N |
964 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
965 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
966 | } |
967 | ||
968 | static void exp_unhash(struct svc_export *exp) | |
969 | { | |
970 | struct svc_expkey *ek; | |
54775491 | 971 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
972 | |
973 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
2d3bb252 | 974 | if (!IS_ERR(ek)) { |
1da177e4 | 975 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 976 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
977 | } |
978 | svc_expkey_cache.nextcheck = get_seconds(); | |
979 | } | |
980 | ||
981 | /* | |
982 | * Export a file system. | |
983 | */ | |
984 | int | |
985 | exp_export(struct nfsctl_export *nxp) | |
986 | { | |
987 | svc_client *clp; | |
988 | struct svc_export *exp = NULL; | |
989 | struct svc_export new; | |
990 | struct svc_expkey *fsid_key = NULL; | |
a63bb996 | 991 | struct path path; |
1da177e4 LT |
992 | int err; |
993 | ||
994 | /* Consistency check */ | |
995 | err = -EINVAL; | |
996 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
997 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
998 | goto out; | |
999 | ||
1000 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
1001 | nxp->ex_client, nxp->ex_path, | |
1002 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
1003 | nxp->ex_flags); | |
1004 | ||
1005 | /* Try to lock the export table for update */ | |
1006 | exp_writelock(); | |
1007 | ||
1008 | /* Look up client info */ | |
1009 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
1010 | goto out_unlock; | |
1011 | ||
1012 | ||
1013 | /* Look up the dentry */ | |
a63bb996 | 1014 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 | 1015 | if (err) |
53e6d8d1 | 1016 | goto out_put_clp; |
1da177e4 LT |
1017 | err = -EINVAL; |
1018 | ||
55430e2e | 1019 | exp = exp_get_by_name(clp, &path, NULL); |
1da177e4 | 1020 | |
f988443a N |
1021 | memset(&new, 0, sizeof(new)); |
1022 | ||
1da177e4 LT |
1023 | /* must make sure there won't be an ex_fsid clash */ |
1024 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
2d3bb252 | 1025 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
e83aece3 | 1026 | fsid_key->ek_path.mnt && |
a63bb996 AV |
1027 | (fsid_key->ek_path.mnt != path.mnt || |
1028 | fsid_key->ek_path.dentry != path.dentry)) | |
1da177e4 LT |
1029 | goto finish; |
1030 | ||
2d3bb252 | 1031 | if (!IS_ERR(exp)) { |
1da177e4 LT |
1032 | /* just a flags/id/fsid update */ |
1033 | ||
1034 | exp_fsid_unhash(exp); | |
1035 | exp->ex_flags = nxp->ex_flags; | |
1036 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1037 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1038 | exp->ex_fsid = nxp->ex_dev; | |
1039 | ||
1040 | err = exp_fsid_hash(clp, exp); | |
1041 | goto finish; | |
1042 | } | |
1043 | ||
774b1478 | 1044 | err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL); |
1da177e4 LT |
1045 | if (err) goto finish; |
1046 | ||
1047 | err = -ENOMEM; | |
1048 | ||
1049 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1050 | ||
1051 | new.h.expiry_time = NEVER; | |
1052 | new.h.flags = 0; | |
54775491 JB |
1053 | new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL); |
1054 | if (!new.ex_pathname) | |
f988443a | 1055 | goto finish; |
1da177e4 | 1056 | new.ex_client = clp; |
a63bb996 | 1057 | new.ex_path = path; |
1da177e4 LT |
1058 | new.ex_flags = nxp->ex_flags; |
1059 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1060 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1061 | new.ex_fsid = nxp->ex_dev; | |
1062 | ||
4f7774c3 N |
1063 | exp = svc_export_lookup(&new); |
1064 | if (exp) | |
1065 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1066 | |
4f7774c3 | 1067 | if (!exp) |
1da177e4 LT |
1068 | goto finish; |
1069 | ||
1da177e4 LT |
1070 | if (exp_hash(clp, exp) || |
1071 | exp_fsid_hash(clp, exp)) { | |
1072 | /* failed to create at least one index */ | |
1073 | exp_do_unexport(exp); | |
1074 | cache_flush(); | |
f988443a N |
1075 | } else |
1076 | err = 0; | |
1da177e4 | 1077 | finish: |
54775491 | 1078 | kfree(new.ex_pathname); |
1da177e4 LT |
1079 | if (exp) |
1080 | exp_put(exp); | |
1081 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 1082 | cache_put(&fsid_key->h, &svc_expkey_cache); |
a63bb996 | 1083 | path_put(&path); |
53e6d8d1 JL |
1084 | out_put_clp: |
1085 | auth_domain_put(clp); | |
1da177e4 LT |
1086 | out_unlock: |
1087 | exp_writeunlock(); | |
1088 | out: | |
1089 | return err; | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Unexport a file system. The export entry has already | |
1094 | * been removed from the client's list of exported fs's. | |
1095 | */ | |
1096 | static void | |
1097 | exp_do_unexport(svc_export *unexp) | |
1098 | { | |
1099 | unexp->h.expiry_time = get_seconds()-1; | |
1100 | svc_export_cache.nextcheck = get_seconds(); | |
1101 | exp_unhash(unexp); | |
1102 | exp_fsid_unhash(unexp); | |
1103 | } | |
1104 | ||
1105 | ||
1106 | /* | |
1107 | * unexport syscall. | |
1108 | */ | |
1109 | int | |
1110 | exp_unexport(struct nfsctl_export *nxp) | |
1111 | { | |
1112 | struct auth_domain *dom; | |
1113 | svc_export *exp; | |
a63bb996 | 1114 | struct path path; |
1da177e4 LT |
1115 | int err; |
1116 | ||
1117 | /* Consistency check */ | |
1118 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1119 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1120 | return -EINVAL; | |
1121 | ||
1122 | exp_writelock(); | |
1123 | ||
1124 | err = -EINVAL; | |
1125 | dom = auth_domain_find(nxp->ex_client); | |
1126 | if (!dom) { | |
1127 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1128 | goto out_unlock; | |
1129 | } | |
1130 | ||
a63bb996 | 1131 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 LT |
1132 | if (err) |
1133 | goto out_domain; | |
1134 | ||
1135 | err = -EINVAL; | |
55430e2e | 1136 | exp = exp_get_by_name(dom, &path, NULL); |
a63bb996 | 1137 | path_put(&path); |
2d3bb252 | 1138 | if (IS_ERR(exp)) |
1da177e4 LT |
1139 | goto out_domain; |
1140 | ||
1141 | exp_do_unexport(exp); | |
1142 | exp_put(exp); | |
1143 | err = 0; | |
1144 | ||
1145 | out_domain: | |
1146 | auth_domain_put(dom); | |
1147 | cache_flush(); | |
1148 | out_unlock: | |
1149 | exp_writeunlock(); | |
1150 | return err; | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Obtain the root fh on behalf of a client. | |
1155 | * This could be done in user space, but I feel that it adds some safety | |
1156 | * since its harder to fool a kernel module than a user space program. | |
1157 | */ | |
1158 | int | |
a63bb996 | 1159 | exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
1160 | { |
1161 | struct svc_export *exp; | |
a63bb996 | 1162 | struct path path; |
1da177e4 LT |
1163 | struct inode *inode; |
1164 | struct svc_fh fh; | |
1165 | int err; | |
1166 | ||
1167 | err = -EPERM; | |
1168 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
1169 | if (kern_path(name, 0, &path)) { |
1170 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
1171 | return err; |
1172 | } | |
a63bb996 | 1173 | inode = path.dentry->d_inode; |
1da177e4 LT |
1174 | |
1175 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 1176 | name, path.dentry, clp->name, |
1da177e4 | 1177 | inode->i_sb->s_id, inode->i_ino); |
5bf3bd2b | 1178 | exp = exp_parent(clp, &path); |
4b41bd85 BF |
1179 | if (IS_ERR(exp)) { |
1180 | err = PTR_ERR(exp); | |
1181 | goto out; | |
1182 | } | |
1da177e4 LT |
1183 | |
1184 | /* | |
1185 | * fh must be initialized before calling fh_compose | |
1186 | */ | |
1187 | fh_init(&fh, maxsize); | |
a63bb996 | 1188 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
1189 | err = -EINVAL; |
1190 | else | |
1191 | err = 0; | |
1192 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1193 | fh_put(&fh); | |
1194 | exp_put(exp); | |
1195 | out: | |
a63bb996 | 1196 | path_put(&path); |
1da177e4 LT |
1197 | return err; |
1198 | } | |
1199 | ||
cce76f9b AB |
1200 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, |
1201 | u32 *fsidv, struct cache_req *reqp) | |
eab7e2e6 N |
1202 | { |
1203 | struct svc_export *exp; | |
1204 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 1205 | if (IS_ERR(ek)) |
e231c2ee | 1206 | return ERR_CAST(ek); |
eab7e2e6 | 1207 | |
55430e2e | 1208 | exp = exp_get_by_name(clp, &ek->ek_path, reqp); |
baab935f | 1209 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 1210 | |
2d3bb252 | 1211 | if (IS_ERR(exp)) |
e231c2ee | 1212 | return ERR_CAST(exp); |
eab7e2e6 N |
1213 | return exp; |
1214 | } | |
1215 | ||
32c1eb0c AA |
1216 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
1217 | { | |
1218 | struct exp_flavor_info *f; | |
1219 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1220 | ||
1221 | /* legacy gss-only clients are always OK: */ | |
1222 | if (exp->ex_client == rqstp->rq_gssclient) | |
1223 | return 0; | |
1224 | /* ip-address based client; check sec= export option: */ | |
1225 | for (f = exp->ex_flavors; f < end; f++) { | |
1226 | if (f->pseudoflavor == rqstp->rq_flavor) | |
1227 | return 0; | |
1228 | } | |
1229 | /* defaults in absence of sec= options: */ | |
1230 | if (exp->ex_nflavors == 0) { | |
1231 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
1232 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
1233 | return 0; | |
1234 | } | |
1235 | return nfserr_wrongsec; | |
1236 | } | |
1237 | ||
0989a788 | 1238 | /* |
2ea2209f BF |
1239 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1240 | * auth_unix client) if it's available and has secinfo information; | |
1241 | * otherwise, will try to use rq_gssclient. | |
1242 | * | |
0989a788 BF |
1243 | * Called from functions that handle requests; functions that do work on |
1244 | * behalf of mountd are passed a single client name to use, and should | |
1245 | * use exp_get_by_name() or exp_find(). | |
1246 | */ | |
1247 | struct svc_export * | |
91c9fa8f | 1248 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1249 | { |
9a25b96c | 1250 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1251 | |
1252 | if (rqstp->rq_client == NULL) | |
1253 | goto gss; | |
3ab4d8b1 | 1254 | |
2ea2209f | 1255 | /* First try the auth_unix client: */ |
91c9fa8f | 1256 | exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
1257 | if (PTR_ERR(exp) == -ENOENT) |
1258 | goto gss; | |
1259 | if (IS_ERR(exp)) | |
1260 | return exp; | |
1261 | /* If it has secinfo, assume there are no gss/... clients */ | |
1262 | if (exp->ex_nflavors > 0) | |
1263 | return exp; | |
1264 | gss: | |
1265 | /* Otherwise, try falling back on gss client */ | |
1266 | if (rqstp->rq_gssclient == NULL) | |
1267 | return exp; | |
91c9fa8f | 1268 | gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
1269 | if (PTR_ERR(gssexp) == -ENOENT) |
1270 | return exp; | |
9a25b96c | 1271 | if (!IS_ERR(exp)) |
2ea2209f BF |
1272 | exp_put(exp); |
1273 | return gssexp; | |
0989a788 BF |
1274 | } |
1275 | ||
1276 | struct svc_export * | |
1277 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1278 | { | |
9a25b96c | 1279 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1280 | |
1281 | if (rqstp->rq_client == NULL) | |
1282 | goto gss; | |
3ab4d8b1 | 1283 | |
2ea2209f BF |
1284 | /* First try the auth_unix client: */ |
1285 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
1286 | if (PTR_ERR(exp) == -ENOENT) | |
1287 | goto gss; | |
1288 | if (IS_ERR(exp)) | |
1289 | return exp; | |
1290 | /* If it has secinfo, assume there are no gss/... clients */ | |
1291 | if (exp->ex_nflavors > 0) | |
1292 | return exp; | |
1293 | gss: | |
1294 | /* Otherwise, try falling back on gss client */ | |
1295 | if (rqstp->rq_gssclient == NULL) | |
1296 | return exp; | |
1297 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
1298 | &rqstp->rq_chandle); | |
1299 | if (PTR_ERR(gssexp) == -ENOENT) | |
1300 | return exp; | |
9a25b96c | 1301 | if (!IS_ERR(exp)) |
2ea2209f BF |
1302 | exp_put(exp); |
1303 | return gssexp; | |
0989a788 BF |
1304 | } |
1305 | ||
1306 | struct svc_export * | |
e64c390c | 1307 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1308 | { |
e64c390c AV |
1309 | struct dentry *saved = dget(path->dentry); |
1310 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1311 | |
e64c390c AV |
1312 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1313 | struct dentry *parent = dget_parent(path->dentry); | |
1314 | dput(path->dentry); | |
1315 | path->dentry = parent; | |
1316 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1317 | } |
e64c390c AV |
1318 | dput(path->dentry); |
1319 | path->dentry = saved; | |
2ea2209f | 1320 | return exp; |
0989a788 | 1321 | } |
eab7e2e6 | 1322 | |
f39bde24 BF |
1323 | static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp) |
1324 | { | |
f39bde24 BF |
1325 | u32 fsidv[2]; |
1326 | ||
1327 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1328 | ||
260c64d2 | 1329 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1330 | } |
1331 | ||
1da177e4 LT |
1332 | /* |
1333 | * Called when we need the filehandle for the root of the pseudofs, | |
1334 | * for a given NFSv4 client. The root is defined to be the | |
1335 | * export point with fsid==0 | |
1336 | */ | |
c7afef1f | 1337 | __be32 |
df547efb | 1338 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1339 | { |
eab7e2e6 | 1340 | struct svc_export *exp; |
c7afef1f | 1341 | __be32 rv; |
1da177e4 | 1342 | |
f39bde24 | 1343 | exp = find_fsidzero_export(rqstp); |
6899320c BF |
1344 | if (IS_ERR(exp)) |
1345 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1346 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
32c1eb0c AA |
1347 | if (rv) |
1348 | goto out; | |
1349 | rv = check_nfsd_access(exp, rqstp); | |
2671a4bf TM |
1350 | if (rv) |
1351 | fh_put(fhp); | |
32c1eb0c | 1352 | out: |
d0ebd9c0 | 1353 | exp_put(exp); |
1da177e4 LT |
1354 | return rv; |
1355 | } | |
1356 | ||
1357 | /* Iterator */ | |
1358 | ||
1359 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1360 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1361 | { |
1362 | loff_t n = *pos; | |
1363 | unsigned hash, export; | |
1364 | struct cache_head *ch; | |
1365 | ||
1366 | exp_readlock(); | |
1367 | read_lock(&svc_export_cache.hash_lock); | |
1368 | if (!n--) | |
bc6f02e5 | 1369 | return SEQ_START_TOKEN; |
1da177e4 LT |
1370 | hash = n >> 32; |
1371 | export = n & ((1LL<<32) - 1); | |
1372 | ||
1373 | ||
1374 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1375 | if (!export--) | |
1376 | return ch; | |
1377 | n &= ~((1LL<<32) - 1); | |
1378 | do { | |
1379 | hash++; | |
1380 | n += 1LL<<32; | |
1381 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1382 | if (hash >= EXPORT_HASHMAX) | |
1383 | return NULL; | |
1384 | *pos = n+1; | |
1385 | return export_table[hash]; | |
1386 | } | |
1387 | ||
1388 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1389 | { | |
1390 | struct cache_head *ch = p; | |
1391 | int hash = (*pos >> 32); | |
1392 | ||
bc6f02e5 | 1393 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1394 | hash = 0; |
1395 | else if (ch->next == NULL) { | |
1396 | hash++; | |
1397 | *pos += 1LL<<32; | |
1398 | } else { | |
1399 | ++*pos; | |
1400 | return ch->next; | |
1401 | } | |
1402 | *pos &= ~((1LL<<32) - 1); | |
1403 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1404 | hash++; | |
1405 | *pos += 1LL<<32; | |
1406 | } | |
1407 | if (hash >= EXPORT_HASHMAX) | |
1408 | return NULL; | |
1409 | ++*pos; | |
1410 | return export_table[hash]; | |
1411 | } | |
1412 | ||
1413 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1414 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1415 | { |
1416 | read_unlock(&svc_export_cache.hash_lock); | |
1417 | exp_readunlock(); | |
1418 | } | |
1419 | ||
1420 | static struct flags { | |
1421 | int flag; | |
1422 | char *name[2]; | |
1423 | } expflags[] = { | |
1424 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1425 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1426 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1427 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1428 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1429 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1430 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1431 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1432 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1433 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1434 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1435 | #ifdef MSNFS |
1436 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1437 | #endif | |
1438 | { 0, {"", ""}} | |
1439 | }; | |
1440 | ||
ac34cdb0 | 1441 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1442 | { |
1da177e4 | 1443 | struct flags *flg; |
ac34cdb0 | 1444 | int state, first = 0; |
1da177e4 LT |
1445 | |
1446 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1447 | if (flg->flag & ~mask) |
1448 | continue; | |
1449 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1450 | if (*flg->name[state]) |
1451 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1452 | } | |
ac34cdb0 BF |
1453 | } |
1454 | ||
91fe39d3 BF |
1455 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1456 | { | |
1457 | seq_printf(m, ","); | |
1458 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1459 | } | |
1460 | ||
1461 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) | |
1462 | { | |
1463 | struct exp_flavor_info *f; | |
1464 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1465 | int lastflags = 0, first = 0; | |
1466 | ||
1467 | if (exp->ex_nflavors == 0) | |
1468 | return; | |
1469 | for (f = exp->ex_flavors; f < end; f++) { | |
1470 | if (first || f->flags != lastflags) { | |
1471 | if (!first) | |
1472 | show_secinfo_flags(m, lastflags); | |
1473 | seq_printf(m, ",sec=%d", f->pseudoflavor); | |
1474 | lastflags = f->flags; | |
1475 | } else { | |
1476 | seq_printf(m, ":%d", f->pseudoflavor); | |
1477 | } | |
1478 | } | |
1479 | show_secinfo_flags(m, lastflags); | |
1480 | } | |
1481 | ||
ac34cdb0 BF |
1482 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1483 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1484 | { | |
1485 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1486 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1487 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1488 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1489 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1490 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1491 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1492 | if (fsloc && fsloc->locations_count > 0) { |
1493 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1494 | int i; | |
1495 | ||
ac34cdb0 | 1496 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1497 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1498 | seq_putc(m, '@'); | |
1499 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1500 | for (i = 1; i < fsloc->locations_count; i++) { | |
1501 | seq_putc(m, ';'); | |
1502 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1503 | seq_putc(m, '@'); | |
1504 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1505 | } | |
1506 | } | |
1da177e4 LT |
1507 | } |
1508 | ||
1509 | static int e_show(struct seq_file *m, void *p) | |
1510 | { | |
1511 | struct cache_head *cp = p; | |
1512 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1513 | |
bc6f02e5 | 1514 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1515 | seq_puts(m, "# Version 1.1\n"); |
1516 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1da177e4 LT |
1520 | cache_get(&exp->h); |
1521 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1522 | return 0; | |
baab935f | 1523 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1524 | return svc_export_show(m, &svc_export_cache, cp); |
1525 | } | |
1526 | ||
88e9d34c | 1527 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1528 | .start = e_start, |
1529 | .next = e_next, | |
1530 | .stop = e_stop, | |
1531 | .show = e_show, | |
1532 | }; | |
1533 | ||
1534 | /* | |
1535 | * Add or modify a client. | |
1536 | * Change requests may involve the list of host addresses. The list of | |
1537 | * exports and possibly existing uid maps are left untouched. | |
1538 | */ | |
1539 | int | |
1540 | exp_addclient(struct nfsctl_client *ncp) | |
1541 | { | |
1542 | struct auth_domain *dom; | |
1543 | int i, err; | |
f15364bd | 1544 | struct in6_addr addr6; |
1da177e4 LT |
1545 | |
1546 | /* First, consistency check. */ | |
1547 | err = -EINVAL; | |
1548 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1549 | goto out; | |
1550 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1551 | goto out; | |
1552 | ||
1553 | /* Lock the hashtable */ | |
1554 | exp_writelock(); | |
1555 | ||
1556 | dom = unix_domain_find(ncp->cl_ident); | |
1557 | ||
1558 | err = -ENOMEM; | |
1559 | if (!dom) | |
1560 | goto out_unlock; | |
1561 | ||
1562 | /* Insert client into hashtable. */ | |
f15364bd AC |
1563 | for (i = 0; i < ncp->cl_naddr; i++) { |
1564 | ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6); | |
1565 | auth_unix_add_addr(&addr6, dom); | |
1566 | } | |
1da177e4 LT |
1567 | auth_unix_forget_old(dom); |
1568 | auth_domain_put(dom); | |
1569 | ||
1570 | err = 0; | |
1571 | ||
1572 | out_unlock: | |
1573 | exp_writeunlock(); | |
1574 | out: | |
1575 | return err; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Delete a client given an identifier. | |
1580 | */ | |
1581 | int | |
1582 | exp_delclient(struct nfsctl_client *ncp) | |
1583 | { | |
1584 | int err; | |
1585 | struct auth_domain *dom; | |
1586 | ||
1587 | err = -EINVAL; | |
1588 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1589 | goto out; | |
1590 | ||
1591 | /* Lock the hashtable */ | |
1592 | exp_writelock(); | |
1593 | ||
1594 | dom = auth_domain_find(ncp->cl_ident); | |
1595 | /* just make sure that no addresses work | |
1596 | * and that it will expire soon | |
1597 | */ | |
1598 | if (dom) { | |
1599 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1600 | auth_domain_put(dom); |
1601 | } | |
1602 | ||
1603 | exp_writeunlock(); | |
1604 | out: | |
1605 | return err; | |
1606 | } | |
1607 | ||
1608 | /* | |
1609 | * Verify that string is non-empty and does not exceed max length. | |
1610 | */ | |
1611 | static int | |
1612 | exp_verify_string(char *cp, int max) | |
1613 | { | |
1614 | int i; | |
1615 | ||
1616 | for (i = 0; i < max; i++) | |
1617 | if (!cp[i]) | |
1618 | return i; | |
1619 | cp[i] = 0; | |
1620 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Initialize the exports module. | |
1626 | */ | |
dbf847ec | 1627 | int |
1da177e4 LT |
1628 | nfsd_export_init(void) |
1629 | { | |
dbf847ec | 1630 | int rv; |
1da177e4 LT |
1631 | dprintk("nfsd: initializing export module.\n"); |
1632 | ||
dbf847ec BF |
1633 | rv = cache_register(&svc_export_cache); |
1634 | if (rv) | |
1635 | return rv; | |
1636 | rv = cache_register(&svc_expkey_cache); | |
1637 | if (rv) | |
1638 | cache_unregister(&svc_export_cache); | |
1639 | return rv; | |
1da177e4 LT |
1640 | |
1641 | } | |
1642 | ||
1643 | /* | |
1644 | * Flush exports table - called when last nfsd thread is killed | |
1645 | */ | |
1646 | void | |
1647 | nfsd_export_flush(void) | |
1648 | { | |
1649 | exp_writelock(); | |
1650 | cache_purge(&svc_expkey_cache); | |
1651 | cache_purge(&svc_export_cache); | |
1652 | exp_writeunlock(); | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * Shutdown the exports module. | |
1657 | */ | |
1658 | void | |
1659 | nfsd_export_shutdown(void) | |
1660 | { | |
1661 | ||
1662 | dprintk("nfsd: shutting down export module.\n"); | |
1663 | ||
1664 | exp_writelock(); | |
1665 | ||
df95a9d4 BF |
1666 | cache_unregister(&svc_expkey_cache); |
1667 | cache_unregister(&svc_export_cache); | |
1da177e4 LT |
1668 | svcauth_unix_purge(); |
1669 | ||
1670 | exp_writeunlock(); | |
1671 | dprintk("nfsd: export shutdown complete.\n"); | |
1672 | } |