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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 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
1da177e4 | 16 | #include <linux/namei.h> |
f35279d3 | 17 | #include <linux/module.h> |
a5694255 | 18 | #include <linux/exportfs.h> |
1da177e4 | 19 | |
1da177e4 | 20 | #include <linux/nfsd/syscall.h> |
f15364bd | 21 | #include <net/ipv6.h> |
1da177e4 | 22 | |
9a74af21 | 23 | #include "nfsd.h" |
1557aca7 | 24 | #include "nfsfh.h" |
9a74af21 | 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 | ||
61f8603d N |
262 | static int |
263 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 264 | { |
8d270f7f N |
265 | int hash = item->ek_fsidtype; |
266 | char * cp = (char*)item->ek_fsid; | |
267 | int len = key_len(item->ek_fsidtype); | |
268 | ||
269 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
270 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
271 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
272 | return hash; |
273 | } | |
274 | ||
275 | static struct svc_expkey * | |
276 | svc_expkey_lookup(struct svc_expkey *item) | |
277 | { | |
278 | struct cache_head *ch; | |
279 | int hash = svc_expkey_hash(item); | |
8d270f7f N |
280 | |
281 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
282 | hash); | |
283 | if (ch) | |
284 | return container_of(ch, struct svc_expkey, h); | |
285 | else | |
286 | return NULL; | |
287 | } | |
288 | ||
289 | static struct svc_expkey * | |
290 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
291 | { | |
292 | struct cache_head *ch; | |
61f8603d | 293 | int hash = svc_expkey_hash(new); |
8d270f7f N |
294 | |
295 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
296 | &old->h, hash); | |
297 | if (ch) | |
298 | return container_of(ch, struct svc_expkey, h); | |
299 | else | |
300 | return NULL; | |
301 | } | |
302 | ||
1da177e4 LT |
303 | |
304 | #define EXPORT_HASHBITS 8 | |
305 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
306 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
307 | ||
308 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
309 | ||
93346919 MN |
310 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
311 | { | |
312 | int i; | |
313 | ||
314 | for (i = 0; i < fsloc->locations_count; i++) { | |
315 | kfree(fsloc->locations[i].path); | |
316 | kfree(fsloc->locations[i].hosts); | |
317 | } | |
318 | kfree(fsloc->locations); | |
319 | } | |
320 | ||
baab935f | 321 | static void svc_export_put(struct kref *ref) |
1da177e4 | 322 | { |
baab935f | 323 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 324 | path_put(&exp->ex_path); |
baab935f | 325 | auth_domain_put(exp->ex_client); |
54775491 | 326 | kfree(exp->ex_pathname); |
93346919 | 327 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 328 | kfree(exp); |
1da177e4 LT |
329 | } |
330 | ||
331 | static void svc_export_request(struct cache_detail *cd, | |
332 | struct cache_head *h, | |
333 | char **bpp, int *blen) | |
334 | { | |
335 | /* client path */ | |
336 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
337 | char *pth; | |
338 | ||
339 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 340 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
341 | if (IS_ERR(pth)) { |
342 | /* is this correct? */ | |
343 | (*bpp)[0] = '\n'; | |
344 | return; | |
345 | } | |
346 | qword_add(bpp, blen, pth); | |
347 | (*bpp)[-1] = '\n'; | |
348 | } | |
349 | ||
bc74b4f5 TM |
350 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
351 | { | |
352 | return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); | |
353 | } | |
354 | ||
74cae61a AB |
355 | static struct svc_export *svc_export_update(struct svc_export *new, |
356 | struct svc_export *old); | |
4f7774c3 | 357 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 358 | |
774b1478 | 359 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
360 | { |
361 | ||
f2ca7153 BF |
362 | /* |
363 | * We currently export only dirs, regular files, and (for v4 | |
364 | * pseudoroot) symlinks. | |
1da177e4 LT |
365 | */ |
366 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 367 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
368 | !S_ISREG(inode->i_mode)) |
369 | return -ENOTDIR; | |
370 | ||
774b1478 BF |
371 | /* |
372 | * Mountd should never pass down a writeable V4ROOT export, but, | |
373 | * just to make sure: | |
374 | */ | |
375 | if (*flags & NFSEXP_V4ROOT) | |
376 | *flags |= NFSEXP_READONLY; | |
377 | ||
1da177e4 LT |
378 | /* There are two requirements on a filesystem to be exportable. |
379 | * 1: We must be able to identify the filesystem from a number. | |
380 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 381 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
382 | * 2: We must be able to find an inode from a filehandle. |
383 | * This means that s_export_op must be set. | |
384 | */ | |
385 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 386 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 387 | uuid == NULL) { |
3e3b4800 | 388 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
389 | return -EINVAL; |
390 | } | |
cfaea787 CH |
391 | |
392 | if (!inode->i_sb->s_export_op || | |
393 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
394 | dprintk("exp_export: export of invalid fs type.\n"); |
395 | return -EINVAL; | |
396 | } | |
397 | ||
1da177e4 LT |
398 | return 0; |
399 | ||
400 | } | |
401 | ||
93346919 MN |
402 | #ifdef CONFIG_NFSD_V4 |
403 | ||
404 | static int | |
405 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
406 | { | |
407 | int len; | |
408 | int migrated, i, err; | |
409 | ||
93346919 MN |
410 | /* listsize */ |
411 | err = get_int(mesg, &fsloc->locations_count); | |
412 | if (err) | |
413 | return err; | |
414 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
415 | return -EINVAL; | |
416 | if (fsloc->locations_count == 0) | |
417 | return 0; | |
418 | ||
419 | fsloc->locations = kzalloc(fsloc->locations_count | |
420 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
421 | if (!fsloc->locations) | |
422 | return -ENOMEM; | |
423 | for (i=0; i < fsloc->locations_count; i++) { | |
424 | /* colon separated host list */ | |
425 | err = -EINVAL; | |
426 | len = qword_get(mesg, buf, PAGE_SIZE); | |
427 | if (len <= 0) | |
428 | goto out_free_all; | |
429 | err = -ENOMEM; | |
430 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
431 | if (!fsloc->locations[i].hosts) | |
432 | goto out_free_all; | |
433 | err = -EINVAL; | |
434 | /* slash separated path component list */ | |
435 | len = qword_get(mesg, buf, PAGE_SIZE); | |
436 | if (len <= 0) | |
437 | goto out_free_all; | |
438 | err = -ENOMEM; | |
439 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
440 | if (!fsloc->locations[i].path) | |
441 | goto out_free_all; | |
442 | } | |
443 | /* migrated */ | |
444 | err = get_int(mesg, &migrated); | |
445 | if (err) | |
446 | goto out_free_all; | |
447 | err = -EINVAL; | |
448 | if (migrated < 0 || migrated > 1) | |
449 | goto out_free_all; | |
450 | fsloc->migrated = migrated; | |
451 | return 0; | |
452 | out_free_all: | |
453 | nfsd4_fslocs_free(fsloc); | |
454 | return err; | |
455 | } | |
456 | ||
e677bfe4 AA |
457 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
458 | { | |
459 | int listsize, err; | |
460 | struct exp_flavor_info *f; | |
461 | ||
462 | err = get_int(mesg, &listsize); | |
463 | if (err) | |
464 | return err; | |
465 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
466 | return -EINVAL; | |
467 | ||
468 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
469 | err = get_int(mesg, &f->pseudoflavor); | |
470 | if (err) | |
471 | return err; | |
472 | /* | |
80492e7d RK |
473 | * XXX: It would be nice to also check whether this |
474 | * pseudoflavor is supported, so we can discover the | |
475 | * problem at export time instead of when a client fails | |
476 | * to authenticate. | |
e677bfe4 | 477 | */ |
e677bfe4 AA |
478 | err = get_int(mesg, &f->flags); |
479 | if (err) | |
480 | return err; | |
481 | /* Only some flags are allowed to differ between flavors: */ | |
482 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
483 | return -EINVAL; | |
484 | } | |
485 | exp->ex_nflavors = listsize; | |
486 | return 0; | |
487 | } | |
488 | ||
93346919 | 489 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
490 | static inline int |
491 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
492 | static inline int | |
493 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
494 | #endif |
495 | ||
1da177e4 LT |
496 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
497 | { | |
498 | /* client path expiry [flags anonuid anongid fsid] */ | |
499 | char *buf; | |
500 | int len; | |
501 | int err; | |
502 | struct auth_domain *dom = NULL; | |
c1a2a475 | 503 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
504 | int an_int; |
505 | ||
1da177e4 LT |
506 | if (mesg[mlen-1] != '\n') |
507 | return -EINVAL; | |
508 | mesg[mlen-1] = 0; | |
509 | ||
510 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
511 | if (!buf) |
512 | return -ENOMEM; | |
1da177e4 LT |
513 | |
514 | /* client */ | |
1da177e4 | 515 | err = -EINVAL; |
c1a2a475 AV |
516 | len = qword_get(&mesg, buf, PAGE_SIZE); |
517 | if (len <= 0) | |
518 | goto out; | |
1da177e4 LT |
519 | |
520 | err = -ENOENT; | |
521 | dom = auth_domain_find(buf); | |
522 | if (!dom) | |
523 | goto out; | |
524 | ||
525 | /* path */ | |
526 | err = -EINVAL; | |
c1a2a475 AV |
527 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
528 | goto out1; | |
529 | ||
530 | err = kern_path(buf, 0, &exp.ex_path); | |
531 | if (err) | |
532 | goto out1; | |
1da177e4 | 533 | |
1da177e4 | 534 | exp.ex_client = dom; |
c1a2a475 | 535 | |
b009a873 | 536 | err = -ENOMEM; |
c1a2a475 | 537 | exp.ex_pathname = kstrdup(buf, GFP_KERNEL); |
54775491 | 538 | if (!exp.ex_pathname) |
c1a2a475 | 539 | goto out2; |
1da177e4 LT |
540 | |
541 | /* expiry */ | |
542 | err = -EINVAL; | |
543 | exp.h.expiry_time = get_expiry(&mesg); | |
544 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 545 | goto out3; |
1da177e4 LT |
546 | |
547 | /* flags */ | |
548 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
549 | if (err == -ENOENT) { |
550 | err = 0; | |
1da177e4 | 551 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 552 | } else { |
c1a2a475 AV |
553 | if (err || an_int < 0) |
554 | goto out3; | |
1da177e4 LT |
555 | exp.ex_flags= an_int; |
556 | ||
557 | /* anon uid */ | |
558 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
559 | if (err) |
560 | goto out3; | |
1da177e4 LT |
561 | exp.ex_anon_uid= an_int; |
562 | ||
563 | /* anon gid */ | |
564 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
565 | if (err) |
566 | goto out3; | |
1da177e4 LT |
567 | exp.ex_anon_gid= an_int; |
568 | ||
569 | /* fsid */ | |
570 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
571 | if (err) |
572 | goto out3; | |
1da177e4 LT |
573 | exp.ex_fsid = an_int; |
574 | ||
af6a4e28 N |
575 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
576 | if (strcmp(buf, "fsloc") == 0) | |
577 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
578 | else if (strcmp(buf, "uuid") == 0) { | |
579 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
580 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
581 | if (len != 16) | |
582 | err = -EINVAL; | |
583 | else { | |
584 | exp.ex_uuid = | |
585 | kmemdup(buf, 16, GFP_KERNEL); | |
586 | if (exp.ex_uuid == NULL) | |
587 | err = -ENOMEM; | |
588 | } | |
e677bfe4 AA |
589 | } else if (strcmp(buf, "secinfo") == 0) |
590 | err = secinfo_parse(&mesg, buf, &exp); | |
591 | else | |
af6a4e28 N |
592 | /* quietly ignore unknown words and anything |
593 | * following. Newer user-space can try to set | |
594 | * new values, then see what the result was. | |
595 | */ | |
596 | break; | |
597 | if (err) | |
c1a2a475 | 598 | goto out4; |
af6a4e28 | 599 | } |
93346919 | 600 | |
774b1478 | 601 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 602 | exp.ex_uuid); |
c1a2a475 AV |
603 | if (err) |
604 | goto out4; | |
1da177e4 LT |
605 | } |
606 | ||
4f7774c3 | 607 | expp = svc_export_lookup(&exp); |
1da177e4 | 608 | if (expp) |
4f7774c3 N |
609 | expp = svc_export_update(&exp, expp); |
610 | else | |
611 | err = -ENOMEM; | |
1da177e4 | 612 | cache_flush(); |
4f7774c3 N |
613 | if (expp == NULL) |
614 | err = -ENOMEM; | |
615 | else | |
616 | exp_put(expp); | |
c1a2a475 | 617 | out4: |
af6a4e28 N |
618 | nfsd4_fslocs_free(&exp.ex_fslocs); |
619 | kfree(exp.ex_uuid); | |
c1a2a475 | 620 | out3: |
54775491 | 621 | kfree(exp.ex_pathname); |
c1a2a475 AV |
622 | out2: |
623 | path_put(&exp.ex_path); | |
624 | out1: | |
625 | auth_domain_put(dom); | |
626 | out: | |
f99d49ad | 627 | kfree(buf); |
1da177e4 LT |
628 | return err; |
629 | } | |
630 | ||
93346919 MN |
631 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
632 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
91fe39d3 | 633 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
634 | |
635 | static int svc_export_show(struct seq_file *m, | |
636 | struct cache_detail *cd, | |
637 | struct cache_head *h) | |
638 | { | |
639 | struct svc_export *exp ; | |
640 | ||
641 | if (h ==NULL) { | |
642 | seq_puts(m, "#path domain(flags)\n"); | |
643 | return 0; | |
644 | } | |
645 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 646 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
647 | seq_putc(m, '\t'); |
648 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
649 | seq_putc(m, '('); | |
650 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 651 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
652 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
653 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
654 | if (exp->ex_uuid) { |
655 | int i; | |
656 | seq_puts(m, ",uuid="); | |
657 | for (i=0; i<16; i++) { | |
658 | if ((i&3) == 0 && i) | |
659 | seq_putc(m, ':'); | |
660 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
661 | } | |
662 | } | |
91fe39d3 | 663 | show_secinfo(m, exp); |
af6a4e28 | 664 | } |
1da177e4 LT |
665 | seq_puts(m, ")\n"); |
666 | return 0; | |
667 | } | |
4f7774c3 | 668 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 669 | { |
4f7774c3 N |
670 | struct svc_export *orig = container_of(a, struct svc_export, h); |
671 | struct svc_export *new = container_of(b, struct svc_export, h); | |
672 | return orig->ex_client == new->ex_client && | |
54775491 JB |
673 | orig->ex_path.dentry == new->ex_path.dentry && |
674 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 675 | } |
4f7774c3 N |
676 | |
677 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 678 | { |
4f7774c3 N |
679 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
680 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
681 | ||
efc36aa5 | 682 | kref_get(&item->ex_client->ref); |
1da177e4 | 683 | new->ex_client = item->ex_client; |
54775491 JB |
684 | new->ex_path.dentry = dget(item->ex_path.dentry); |
685 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
686 | new->ex_pathname = NULL; | |
93346919 MN |
687 | new->ex_fslocs.locations = NULL; |
688 | new->ex_fslocs.locations_count = 0; | |
689 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
690 | } |
691 | ||
4f7774c3 | 692 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 693 | { |
4f7774c3 N |
694 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
695 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 696 | int i; |
4f7774c3 | 697 | |
1da177e4 LT |
698 | new->ex_flags = item->ex_flags; |
699 | new->ex_anon_uid = item->ex_anon_uid; | |
700 | new->ex_anon_gid = item->ex_anon_gid; | |
701 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
702 | new->ex_uuid = item->ex_uuid; |
703 | item->ex_uuid = NULL; | |
54775491 JB |
704 | new->ex_pathname = item->ex_pathname; |
705 | item->ex_pathname = NULL; | |
93346919 MN |
706 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
707 | item->ex_fslocs.locations = NULL; | |
708 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
709 | item->ex_fslocs.locations_count = 0; | |
710 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
711 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
712 | new->ex_nflavors = item->ex_nflavors; |
713 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
714 | new->ex_flavors[i] = item->ex_flavors[i]; | |
715 | } | |
1da177e4 LT |
716 | } |
717 | ||
4f7774c3 N |
718 | static struct cache_head *svc_export_alloc(void) |
719 | { | |
720 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
721 | if (i) | |
722 | return &i->h; | |
723 | else | |
724 | return NULL; | |
725 | } | |
726 | ||
727 | struct cache_detail svc_export_cache = { | |
728 | .owner = THIS_MODULE, | |
729 | .hash_size = EXPORT_HASHMAX, | |
730 | .hash_table = export_table, | |
731 | .name = "nfsd.export", | |
732 | .cache_put = svc_export_put, | |
bc74b4f5 | 733 | .cache_upcall = svc_export_upcall, |
4f7774c3 N |
734 | .cache_parse = svc_export_parse, |
735 | .cache_show = svc_export_show, | |
736 | .match = svc_export_match, | |
737 | .init = svc_export_init, | |
738 | .update = export_update, | |
739 | .alloc = svc_export_alloc, | |
740 | }; | |
741 | ||
61f8603d N |
742 | static int |
743 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 744 | { |
4f7774c3 | 745 | int hash; |
61f8603d | 746 | |
4f7774c3 | 747 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
748 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
749 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
750 | return hash; |
751 | } | |
752 | ||
753 | static struct svc_export * | |
754 | svc_export_lookup(struct svc_export *exp) | |
755 | { | |
756 | struct cache_head *ch; | |
757 | int hash = svc_export_hash(exp); | |
4f7774c3 N |
758 | |
759 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
760 | hash); | |
761 | if (ch) | |
762 | return container_of(ch, struct svc_export, h); | |
763 | else | |
764 | return NULL; | |
765 | } | |
766 | ||
74cae61a | 767 | static struct svc_export * |
4f7774c3 N |
768 | svc_export_update(struct svc_export *new, struct svc_export *old) |
769 | { | |
770 | struct cache_head *ch; | |
61f8603d | 771 | int hash = svc_export_hash(old); |
4f7774c3 N |
772 | |
773 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
774 | &old->h, | |
775 | hash); | |
776 | if (ch) | |
777 | return container_of(ch, struct svc_export, h); | |
778 | else | |
779 | return NULL; | |
780 | } | |
1da177e4 LT |
781 | |
782 | ||
74cae61a | 783 | static struct svc_expkey * |
1da177e4 LT |
784 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
785 | { | |
786 | struct svc_expkey key, *ek; | |
787 | int err; | |
788 | ||
789 | if (!clp) | |
2d3bb252 | 790 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
791 | |
792 | key.ek_client = clp; | |
793 | key.ek_fsidtype = fsid_type; | |
794 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
795 | ||
8d270f7f | 796 | ek = svc_expkey_lookup(&key); |
2d3bb252 BF |
797 | if (ek == NULL) |
798 | return ERR_PTR(-ENOMEM); | |
799 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
800 | if (err) | |
801 | return ERR_PTR(err); | |
1da177e4 LT |
802 | return ek; |
803 | } | |
804 | ||
805 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
806 | struct svc_export *exp) | |
807 | { | |
808 | struct svc_expkey key, *ek; | |
809 | ||
810 | key.ek_client = clp; | |
811 | key.ek_fsidtype = fsid_type; | |
812 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
e83aece3 | 813 | key.ek_path = exp->ex_path; |
1da177e4 LT |
814 | key.h.expiry_time = NEVER; |
815 | key.h.flags = 0; | |
816 | ||
8d270f7f N |
817 | ek = svc_expkey_lookup(&key); |
818 | if (ek) | |
819 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 820 | if (ek) { |
baab935f | 821 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
822 | return 0; |
823 | } | |
824 | return -ENOMEM; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Find the client's export entry matching xdev/xino. | |
829 | */ | |
830 | static inline struct svc_expkey * | |
831 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
832 | { | |
833 | u32 fsidv[3]; | |
834 | ||
835 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
836 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
837 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 838 | } |
af6a4e28 N |
839 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
840 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
841 | } |
842 | ||
843 | /* | |
844 | * Find the client's export entry matching fsid | |
845 | */ | |
846 | static inline struct svc_expkey * | |
847 | exp_get_fsid_key(svc_client *clp, int fsid) | |
848 | { | |
849 | u32 fsidv[2]; | |
850 | ||
af6a4e28 | 851 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 852 | |
af6a4e28 | 853 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
854 | } |
855 | ||
55430e2e AV |
856 | static svc_export *exp_get_by_name(svc_client *clp, const struct path *path, |
857 | struct cache_req *reqp) | |
1da177e4 LT |
858 | { |
859 | struct svc_export *exp, key; | |
2d3bb252 | 860 | int err; |
e83aece3 | 861 | |
1da177e4 | 862 | if (!clp) |
2d3bb252 | 863 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
864 | |
865 | key.ex_client = clp; | |
55430e2e | 866 | key.ex_path = *path; |
1da177e4 | 867 | |
4f7774c3 | 868 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
869 | if (exp == NULL) |
870 | return ERR_PTR(-ENOMEM); | |
871 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
872 | if (err) | |
873 | return ERR_PTR(err); | |
1da177e4 LT |
874 | return exp; |
875 | } | |
876 | ||
877 | /* | |
878 | * Find the export entry for a given dentry. | |
879 | */ | |
5bf3bd2b | 880 | static struct svc_export *exp_parent(svc_client *clp, struct path *path) |
1da177e4 | 881 | { |
5bf3bd2b AV |
882 | struct dentry *saved = dget(path->dentry); |
883 | svc_export *exp = exp_get_by_name(clp, path, NULL); | |
884 | ||
885 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
886 | struct dentry *parent = dget_parent(path->dentry); | |
887 | dput(path->dentry); | |
888 | path->dentry = parent; | |
889 | exp = exp_get_by_name(clp, path, NULL); | |
1da177e4 | 890 | } |
5bf3bd2b AV |
891 | dput(path->dentry); |
892 | path->dentry = saved; | |
1da177e4 LT |
893 | return exp; |
894 | } | |
895 | ||
896 | /* | |
897 | * Hashtable locking. Write locks are placed only by user processes | |
898 | * wanting to modify export information. | |
899 | * Write locking only done in this file. Read locking | |
900 | * needed externally. | |
901 | */ | |
902 | ||
903 | static DECLARE_RWSEM(hash_sem); | |
904 | ||
905 | void | |
906 | exp_readlock(void) | |
907 | { | |
908 | down_read(&hash_sem); | |
909 | } | |
910 | ||
911 | static inline void | |
912 | exp_writelock(void) | |
913 | { | |
914 | down_write(&hash_sem); | |
915 | } | |
916 | ||
917 | void | |
918 | exp_readunlock(void) | |
919 | { | |
920 | up_read(&hash_sem); | |
921 | } | |
922 | ||
923 | static inline void | |
924 | exp_writeunlock(void) | |
925 | { | |
926 | up_write(&hash_sem); | |
927 | } | |
928 | ||
929 | static void exp_fsid_unhash(struct svc_export *exp) | |
930 | { | |
931 | struct svc_expkey *ek; | |
932 | ||
933 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
934 | return; | |
935 | ||
936 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
2d3bb252 | 937 | if (!IS_ERR(ek)) { |
1da177e4 | 938 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 939 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
940 | } |
941 | svc_expkey_cache.nextcheck = get_seconds(); | |
942 | } | |
943 | ||
944 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
945 | { | |
946 | u32 fsid[2]; | |
947 | ||
948 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
949 | return 0; | |
950 | ||
af6a4e28 N |
951 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
952 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
953 | } |
954 | ||
955 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
956 | { | |
957 | u32 fsid[2]; | |
54775491 | 958 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
959 | dev_t dev = inode->i_sb->s_dev; |
960 | ||
961 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
962 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
963 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 964 | } |
af6a4e28 N |
965 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
966 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
967 | } |
968 | ||
969 | static void exp_unhash(struct svc_export *exp) | |
970 | { | |
971 | struct svc_expkey *ek; | |
54775491 | 972 | struct inode *inode = exp->ex_path.dentry->d_inode; |
1da177e4 LT |
973 | |
974 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
2d3bb252 | 975 | if (!IS_ERR(ek)) { |
1da177e4 | 976 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 977 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
978 | } |
979 | svc_expkey_cache.nextcheck = get_seconds(); | |
980 | } | |
981 | ||
982 | /* | |
983 | * Export a file system. | |
984 | */ | |
985 | int | |
986 | exp_export(struct nfsctl_export *nxp) | |
987 | { | |
988 | svc_client *clp; | |
989 | struct svc_export *exp = NULL; | |
990 | struct svc_export new; | |
991 | struct svc_expkey *fsid_key = NULL; | |
a63bb996 | 992 | struct path path; |
1da177e4 LT |
993 | int err; |
994 | ||
995 | /* Consistency check */ | |
996 | err = -EINVAL; | |
997 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
998 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
999 | goto out; | |
1000 | ||
1001 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
1002 | nxp->ex_client, nxp->ex_path, | |
1003 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
1004 | nxp->ex_flags); | |
1005 | ||
1006 | /* Try to lock the export table for update */ | |
1007 | exp_writelock(); | |
1008 | ||
1009 | /* Look up client info */ | |
1010 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
1011 | goto out_unlock; | |
1012 | ||
1013 | ||
1014 | /* Look up the dentry */ | |
a63bb996 | 1015 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 | 1016 | if (err) |
53e6d8d1 | 1017 | goto out_put_clp; |
1da177e4 LT |
1018 | err = -EINVAL; |
1019 | ||
55430e2e | 1020 | exp = exp_get_by_name(clp, &path, NULL); |
1da177e4 | 1021 | |
f988443a N |
1022 | memset(&new, 0, sizeof(new)); |
1023 | ||
1da177e4 LT |
1024 | /* must make sure there won't be an ex_fsid clash */ |
1025 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
2d3bb252 | 1026 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
e83aece3 | 1027 | fsid_key->ek_path.mnt && |
a63bb996 AV |
1028 | (fsid_key->ek_path.mnt != path.mnt || |
1029 | fsid_key->ek_path.dentry != path.dentry)) | |
1da177e4 LT |
1030 | goto finish; |
1031 | ||
2d3bb252 | 1032 | if (!IS_ERR(exp)) { |
1da177e4 LT |
1033 | /* just a flags/id/fsid update */ |
1034 | ||
1035 | exp_fsid_unhash(exp); | |
1036 | exp->ex_flags = nxp->ex_flags; | |
1037 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1038 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1039 | exp->ex_fsid = nxp->ex_dev; | |
1040 | ||
1041 | err = exp_fsid_hash(clp, exp); | |
1042 | goto finish; | |
1043 | } | |
1044 | ||
774b1478 | 1045 | err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL); |
1da177e4 LT |
1046 | if (err) goto finish; |
1047 | ||
1048 | err = -ENOMEM; | |
1049 | ||
1050 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1051 | ||
1052 | new.h.expiry_time = NEVER; | |
1053 | new.h.flags = 0; | |
54775491 JB |
1054 | new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL); |
1055 | if (!new.ex_pathname) | |
f988443a | 1056 | goto finish; |
1da177e4 | 1057 | new.ex_client = clp; |
a63bb996 | 1058 | new.ex_path = path; |
1da177e4 LT |
1059 | new.ex_flags = nxp->ex_flags; |
1060 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1061 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1062 | new.ex_fsid = nxp->ex_dev; | |
1063 | ||
4f7774c3 N |
1064 | exp = svc_export_lookup(&new); |
1065 | if (exp) | |
1066 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1067 | |
4f7774c3 | 1068 | if (!exp) |
1da177e4 LT |
1069 | goto finish; |
1070 | ||
1da177e4 LT |
1071 | if (exp_hash(clp, exp) || |
1072 | exp_fsid_hash(clp, exp)) { | |
1073 | /* failed to create at least one index */ | |
1074 | exp_do_unexport(exp); | |
1075 | cache_flush(); | |
f988443a N |
1076 | } else |
1077 | err = 0; | |
1da177e4 | 1078 | finish: |
54775491 | 1079 | kfree(new.ex_pathname); |
d03859a4 | 1080 | if (!IS_ERR_OR_NULL(exp)) |
1da177e4 | 1081 | exp_put(exp); |
d03859a4 | 1082 | if (!IS_ERR_OR_NULL(fsid_key)) |
baab935f | 1083 | cache_put(&fsid_key->h, &svc_expkey_cache); |
a63bb996 | 1084 | path_put(&path); |
53e6d8d1 JL |
1085 | out_put_clp: |
1086 | auth_domain_put(clp); | |
1da177e4 LT |
1087 | out_unlock: |
1088 | exp_writeunlock(); | |
1089 | out: | |
1090 | return err; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Unexport a file system. The export entry has already | |
1095 | * been removed from the client's list of exported fs's. | |
1096 | */ | |
1097 | static void | |
1098 | exp_do_unexport(svc_export *unexp) | |
1099 | { | |
1100 | unexp->h.expiry_time = get_seconds()-1; | |
1101 | svc_export_cache.nextcheck = get_seconds(); | |
1102 | exp_unhash(unexp); | |
1103 | exp_fsid_unhash(unexp); | |
1104 | } | |
1105 | ||
1106 | ||
1107 | /* | |
1108 | * unexport syscall. | |
1109 | */ | |
1110 | int | |
1111 | exp_unexport(struct nfsctl_export *nxp) | |
1112 | { | |
1113 | struct auth_domain *dom; | |
1114 | svc_export *exp; | |
a63bb996 | 1115 | struct path path; |
1da177e4 LT |
1116 | int err; |
1117 | ||
1118 | /* Consistency check */ | |
1119 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1120 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1121 | return -EINVAL; | |
1122 | ||
1123 | exp_writelock(); | |
1124 | ||
1125 | err = -EINVAL; | |
1126 | dom = auth_domain_find(nxp->ex_client); | |
1127 | if (!dom) { | |
1128 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1129 | goto out_unlock; | |
1130 | } | |
1131 | ||
a63bb996 | 1132 | err = kern_path(nxp->ex_path, 0, &path); |
1da177e4 LT |
1133 | if (err) |
1134 | goto out_domain; | |
1135 | ||
1136 | err = -EINVAL; | |
55430e2e | 1137 | exp = exp_get_by_name(dom, &path, NULL); |
a63bb996 | 1138 | path_put(&path); |
2d3bb252 | 1139 | if (IS_ERR(exp)) |
1da177e4 LT |
1140 | goto out_domain; |
1141 | ||
1142 | exp_do_unexport(exp); | |
1143 | exp_put(exp); | |
1144 | err = 0; | |
1145 | ||
1146 | out_domain: | |
1147 | auth_domain_put(dom); | |
1148 | cache_flush(); | |
1149 | out_unlock: | |
1150 | exp_writeunlock(); | |
1151 | return err; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Obtain the root fh on behalf of a client. | |
1156 | * This could be done in user space, but I feel that it adds some safety | |
1157 | * since its harder to fool a kernel module than a user space program. | |
1158 | */ | |
1159 | int | |
a63bb996 | 1160 | exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
1161 | { |
1162 | struct svc_export *exp; | |
a63bb996 | 1163 | struct path path; |
1da177e4 LT |
1164 | struct inode *inode; |
1165 | struct svc_fh fh; | |
1166 | int err; | |
1167 | ||
1168 | err = -EPERM; | |
1169 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
1170 | if (kern_path(name, 0, &path)) { |
1171 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
1172 | return err; |
1173 | } | |
a63bb996 | 1174 | inode = path.dentry->d_inode; |
1da177e4 LT |
1175 | |
1176 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 1177 | name, path.dentry, clp->name, |
1da177e4 | 1178 | inode->i_sb->s_id, inode->i_ino); |
5bf3bd2b | 1179 | exp = exp_parent(clp, &path); |
4b41bd85 BF |
1180 | if (IS_ERR(exp)) { |
1181 | err = PTR_ERR(exp); | |
1182 | goto out; | |
1183 | } | |
1da177e4 LT |
1184 | |
1185 | /* | |
1186 | * fh must be initialized before calling fh_compose | |
1187 | */ | |
1188 | fh_init(&fh, maxsize); | |
a63bb996 | 1189 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
1190 | err = -EINVAL; |
1191 | else | |
1192 | err = 0; | |
1193 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1194 | fh_put(&fh); | |
1195 | exp_put(exp); | |
1196 | out: | |
a63bb996 | 1197 | path_put(&path); |
1da177e4 LT |
1198 | return err; |
1199 | } | |
1200 | ||
cce76f9b AB |
1201 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, |
1202 | u32 *fsidv, struct cache_req *reqp) | |
eab7e2e6 N |
1203 | { |
1204 | struct svc_export *exp; | |
1205 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 1206 | if (IS_ERR(ek)) |
e231c2ee | 1207 | return ERR_CAST(ek); |
eab7e2e6 | 1208 | |
55430e2e | 1209 | exp = exp_get_by_name(clp, &ek->ek_path, reqp); |
baab935f | 1210 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 1211 | |
2d3bb252 | 1212 | if (IS_ERR(exp)) |
e231c2ee | 1213 | return ERR_CAST(exp); |
eab7e2e6 N |
1214 | return exp; |
1215 | } | |
1216 | ||
32c1eb0c AA |
1217 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
1218 | { | |
1219 | struct exp_flavor_info *f; | |
1220 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1221 | ||
1222 | /* legacy gss-only clients are always OK: */ | |
1223 | if (exp->ex_client == rqstp->rq_gssclient) | |
1224 | return 0; | |
1225 | /* ip-address based client; check sec= export option: */ | |
1226 | for (f = exp->ex_flavors; f < end; f++) { | |
1227 | if (f->pseudoflavor == rqstp->rq_flavor) | |
1228 | return 0; | |
1229 | } | |
1230 | /* defaults in absence of sec= options: */ | |
1231 | if (exp->ex_nflavors == 0) { | |
1232 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
1233 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
1234 | return 0; | |
1235 | } | |
1236 | return nfserr_wrongsec; | |
1237 | } | |
1238 | ||
0989a788 | 1239 | /* |
2ea2209f BF |
1240 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1241 | * auth_unix client) if it's available and has secinfo information; | |
1242 | * otherwise, will try to use rq_gssclient. | |
1243 | * | |
0989a788 BF |
1244 | * Called from functions that handle requests; functions that do work on |
1245 | * behalf of mountd are passed a single client name to use, and should | |
1246 | * use exp_get_by_name() or exp_find(). | |
1247 | */ | |
1248 | struct svc_export * | |
91c9fa8f | 1249 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1250 | { |
9a25b96c | 1251 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1252 | |
1253 | if (rqstp->rq_client == NULL) | |
1254 | goto gss; | |
3ab4d8b1 | 1255 | |
2ea2209f | 1256 | /* First try the auth_unix client: */ |
91c9fa8f | 1257 | exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
1258 | if (PTR_ERR(exp) == -ENOENT) |
1259 | goto gss; | |
1260 | if (IS_ERR(exp)) | |
1261 | return exp; | |
1262 | /* If it has secinfo, assume there are no gss/... clients */ | |
1263 | if (exp->ex_nflavors > 0) | |
1264 | return exp; | |
1265 | gss: | |
1266 | /* Otherwise, try falling back on gss client */ | |
1267 | if (rqstp->rq_gssclient == NULL) | |
1268 | return exp; | |
91c9fa8f | 1269 | gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
1270 | if (PTR_ERR(gssexp) == -ENOENT) |
1271 | return exp; | |
9a25b96c | 1272 | if (!IS_ERR(exp)) |
2ea2209f BF |
1273 | exp_put(exp); |
1274 | return gssexp; | |
0989a788 BF |
1275 | } |
1276 | ||
1277 | struct svc_export * | |
1278 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1279 | { | |
9a25b96c | 1280 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1281 | |
1282 | if (rqstp->rq_client == NULL) | |
1283 | goto gss; | |
3ab4d8b1 | 1284 | |
2ea2209f BF |
1285 | /* First try the auth_unix client: */ |
1286 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
1287 | if (PTR_ERR(exp) == -ENOENT) | |
1288 | goto gss; | |
1289 | if (IS_ERR(exp)) | |
1290 | return exp; | |
1291 | /* If it has secinfo, assume there are no gss/... clients */ | |
1292 | if (exp->ex_nflavors > 0) | |
1293 | return exp; | |
1294 | gss: | |
1295 | /* Otherwise, try falling back on gss client */ | |
1296 | if (rqstp->rq_gssclient == NULL) | |
1297 | return exp; | |
1298 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
1299 | &rqstp->rq_chandle); | |
1300 | if (PTR_ERR(gssexp) == -ENOENT) | |
1301 | return exp; | |
9a25b96c | 1302 | if (!IS_ERR(exp)) |
2ea2209f BF |
1303 | exp_put(exp); |
1304 | return gssexp; | |
0989a788 BF |
1305 | } |
1306 | ||
1307 | struct svc_export * | |
e64c390c | 1308 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1309 | { |
e64c390c AV |
1310 | struct dentry *saved = dget(path->dentry); |
1311 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1312 | |
e64c390c AV |
1313 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1314 | struct dentry *parent = dget_parent(path->dentry); | |
1315 | dput(path->dentry); | |
1316 | path->dentry = parent; | |
1317 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1318 | } |
e64c390c AV |
1319 | dput(path->dentry); |
1320 | path->dentry = saved; | |
2ea2209f | 1321 | return exp; |
0989a788 | 1322 | } |
eab7e2e6 | 1323 | |
f39bde24 BF |
1324 | static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp) |
1325 | { | |
f39bde24 BF |
1326 | u32 fsidv[2]; |
1327 | ||
1328 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1329 | ||
260c64d2 | 1330 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1331 | } |
1332 | ||
1da177e4 LT |
1333 | /* |
1334 | * Called when we need the filehandle for the root of the pseudofs, | |
1335 | * for a given NFSv4 client. The root is defined to be the | |
1336 | * export point with fsid==0 | |
1337 | */ | |
c7afef1f | 1338 | __be32 |
df547efb | 1339 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1340 | { |
eab7e2e6 | 1341 | struct svc_export *exp; |
c7afef1f | 1342 | __be32 rv; |
1da177e4 | 1343 | |
f39bde24 | 1344 | exp = find_fsidzero_export(rqstp); |
6899320c BF |
1345 | if (IS_ERR(exp)) |
1346 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1347 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
32c1eb0c AA |
1348 | if (rv) |
1349 | goto out; | |
1350 | rv = check_nfsd_access(exp, rqstp); | |
2671a4bf TM |
1351 | if (rv) |
1352 | fh_put(fhp); | |
32c1eb0c | 1353 | out: |
d0ebd9c0 | 1354 | exp_put(exp); |
1da177e4 LT |
1355 | return rv; |
1356 | } | |
1357 | ||
1358 | /* Iterator */ | |
1359 | ||
1360 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1361 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1362 | { |
1363 | loff_t n = *pos; | |
1364 | unsigned hash, export; | |
1365 | struct cache_head *ch; | |
1366 | ||
1367 | exp_readlock(); | |
1368 | read_lock(&svc_export_cache.hash_lock); | |
1369 | if (!n--) | |
bc6f02e5 | 1370 | return SEQ_START_TOKEN; |
1da177e4 LT |
1371 | hash = n >> 32; |
1372 | export = n & ((1LL<<32) - 1); | |
1373 | ||
1374 | ||
1375 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1376 | if (!export--) | |
1377 | return ch; | |
1378 | n &= ~((1LL<<32) - 1); | |
1379 | do { | |
1380 | hash++; | |
1381 | n += 1LL<<32; | |
1382 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1383 | if (hash >= EXPORT_HASHMAX) | |
1384 | return NULL; | |
1385 | *pos = n+1; | |
1386 | return export_table[hash]; | |
1387 | } | |
1388 | ||
1389 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1390 | { | |
1391 | struct cache_head *ch = p; | |
1392 | int hash = (*pos >> 32); | |
1393 | ||
bc6f02e5 | 1394 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1395 | hash = 0; |
1396 | else if (ch->next == NULL) { | |
1397 | hash++; | |
1398 | *pos += 1LL<<32; | |
1399 | } else { | |
1400 | ++*pos; | |
1401 | return ch->next; | |
1402 | } | |
1403 | *pos &= ~((1LL<<32) - 1); | |
1404 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1405 | hash++; | |
1406 | *pos += 1LL<<32; | |
1407 | } | |
1408 | if (hash >= EXPORT_HASHMAX) | |
1409 | return NULL; | |
1410 | ++*pos; | |
1411 | return export_table[hash]; | |
1412 | } | |
1413 | ||
1414 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1415 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1416 | { |
1417 | read_unlock(&svc_export_cache.hash_lock); | |
1418 | exp_readunlock(); | |
1419 | } | |
1420 | ||
1421 | static struct flags { | |
1422 | int flag; | |
1423 | char *name[2]; | |
1424 | } expflags[] = { | |
1425 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1426 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1427 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1428 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1429 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1430 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1431 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1432 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1433 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1434 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1435 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1436 | #ifdef MSNFS |
1437 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1438 | #endif | |
1439 | { 0, {"", ""}} | |
1440 | }; | |
1441 | ||
ac34cdb0 | 1442 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1443 | { |
1da177e4 | 1444 | struct flags *flg; |
ac34cdb0 | 1445 | int state, first = 0; |
1da177e4 LT |
1446 | |
1447 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1448 | if (flg->flag & ~mask) |
1449 | continue; | |
1450 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1451 | if (*flg->name[state]) |
1452 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1453 | } | |
ac34cdb0 BF |
1454 | } |
1455 | ||
91fe39d3 BF |
1456 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1457 | { | |
1458 | seq_printf(m, ","); | |
1459 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1460 | } | |
1461 | ||
1462 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) | |
1463 | { | |
1464 | struct exp_flavor_info *f; | |
1465 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1466 | int lastflags = 0, first = 0; | |
1467 | ||
1468 | if (exp->ex_nflavors == 0) | |
1469 | return; | |
1470 | for (f = exp->ex_flavors; f < end; f++) { | |
1471 | if (first || f->flags != lastflags) { | |
1472 | if (!first) | |
1473 | show_secinfo_flags(m, lastflags); | |
1474 | seq_printf(m, ",sec=%d", f->pseudoflavor); | |
1475 | lastflags = f->flags; | |
1476 | } else { | |
1477 | seq_printf(m, ":%d", f->pseudoflavor); | |
1478 | } | |
1479 | } | |
1480 | show_secinfo_flags(m, lastflags); | |
1481 | } | |
1482 | ||
ac34cdb0 BF |
1483 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1484 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1485 | { | |
1486 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1487 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1488 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1489 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1490 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1491 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1492 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1493 | if (fsloc && fsloc->locations_count > 0) { |
1494 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1495 | int i; | |
1496 | ||
ac34cdb0 | 1497 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1498 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1499 | seq_putc(m, '@'); | |
1500 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1501 | for (i = 1; i < fsloc->locations_count; i++) { | |
1502 | seq_putc(m, ';'); | |
1503 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1504 | seq_putc(m, '@'); | |
1505 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1506 | } | |
1507 | } | |
1da177e4 LT |
1508 | } |
1509 | ||
1510 | static int e_show(struct seq_file *m, void *p) | |
1511 | { | |
1512 | struct cache_head *cp = p; | |
1513 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1514 | |
bc6f02e5 | 1515 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1516 | seq_puts(m, "# Version 1.1\n"); |
1517 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1518 | return 0; | |
1519 | } | |
1520 | ||
1da177e4 LT |
1521 | cache_get(&exp->h); |
1522 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1523 | return 0; | |
baab935f | 1524 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1525 | return svc_export_show(m, &svc_export_cache, cp); |
1526 | } | |
1527 | ||
88e9d34c | 1528 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1529 | .start = e_start, |
1530 | .next = e_next, | |
1531 | .stop = e_stop, | |
1532 | .show = e_show, | |
1533 | }; | |
1534 | ||
1535 | /* | |
1536 | * Add or modify a client. | |
1537 | * Change requests may involve the list of host addresses. The list of | |
1538 | * exports and possibly existing uid maps are left untouched. | |
1539 | */ | |
1540 | int | |
1541 | exp_addclient(struct nfsctl_client *ncp) | |
1542 | { | |
1543 | struct auth_domain *dom; | |
1544 | int i, err; | |
f15364bd | 1545 | struct in6_addr addr6; |
1da177e4 LT |
1546 | |
1547 | /* First, consistency check. */ | |
1548 | err = -EINVAL; | |
1549 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1550 | goto out; | |
1551 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1552 | goto out; | |
1553 | ||
1554 | /* Lock the hashtable */ | |
1555 | exp_writelock(); | |
1556 | ||
1557 | dom = unix_domain_find(ncp->cl_ident); | |
1558 | ||
1559 | err = -ENOMEM; | |
1560 | if (!dom) | |
1561 | goto out_unlock; | |
1562 | ||
1563 | /* Insert client into hashtable. */ | |
f15364bd AC |
1564 | for (i = 0; i < ncp->cl_naddr; i++) { |
1565 | ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6); | |
1566 | auth_unix_add_addr(&addr6, dom); | |
1567 | } | |
1da177e4 LT |
1568 | auth_unix_forget_old(dom); |
1569 | auth_domain_put(dom); | |
1570 | ||
1571 | err = 0; | |
1572 | ||
1573 | out_unlock: | |
1574 | exp_writeunlock(); | |
1575 | out: | |
1576 | return err; | |
1577 | } | |
1578 | ||
1579 | /* | |
1580 | * Delete a client given an identifier. | |
1581 | */ | |
1582 | int | |
1583 | exp_delclient(struct nfsctl_client *ncp) | |
1584 | { | |
1585 | int err; | |
1586 | struct auth_domain *dom; | |
1587 | ||
1588 | err = -EINVAL; | |
1589 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1590 | goto out; | |
1591 | ||
1592 | /* Lock the hashtable */ | |
1593 | exp_writelock(); | |
1594 | ||
1595 | dom = auth_domain_find(ncp->cl_ident); | |
1596 | /* just make sure that no addresses work | |
1597 | * and that it will expire soon | |
1598 | */ | |
1599 | if (dom) { | |
1600 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1601 | auth_domain_put(dom); |
1602 | } | |
1603 | ||
1604 | exp_writeunlock(); | |
1605 | out: | |
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Verify that string is non-empty and does not exceed max length. | |
1611 | */ | |
1612 | static int | |
1613 | exp_verify_string(char *cp, int max) | |
1614 | { | |
1615 | int i; | |
1616 | ||
1617 | for (i = 0; i < max; i++) | |
1618 | if (!cp[i]) | |
1619 | return i; | |
1620 | cp[i] = 0; | |
1621 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * Initialize the exports module. | |
1627 | */ | |
dbf847ec | 1628 | int |
1da177e4 LT |
1629 | nfsd_export_init(void) |
1630 | { | |
dbf847ec | 1631 | int rv; |
1da177e4 LT |
1632 | dprintk("nfsd: initializing export module.\n"); |
1633 | ||
dbf847ec BF |
1634 | rv = cache_register(&svc_export_cache); |
1635 | if (rv) | |
1636 | return rv; | |
1637 | rv = cache_register(&svc_expkey_cache); | |
1638 | if (rv) | |
1639 | cache_unregister(&svc_export_cache); | |
1640 | return rv; | |
1da177e4 LT |
1641 | |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * Flush exports table - called when last nfsd thread is killed | |
1646 | */ | |
1647 | void | |
1648 | nfsd_export_flush(void) | |
1649 | { | |
1650 | exp_writelock(); | |
1651 | cache_purge(&svc_expkey_cache); | |
1652 | cache_purge(&svc_export_cache); | |
1653 | exp_writeunlock(); | |
1654 | } | |
1655 | ||
1656 | /* | |
1657 | * Shutdown the exports module. | |
1658 | */ | |
1659 | void | |
1660 | nfsd_export_shutdown(void) | |
1661 | { | |
1662 | ||
1663 | dprintk("nfsd: shutting down export module.\n"); | |
1664 | ||
1665 | exp_writelock(); | |
1666 | ||
df95a9d4 BF |
1667 | cache_unregister(&svc_expkey_cache); |
1668 | cache_unregister(&svc_export_cache); | |
1da177e4 LT |
1669 | svcauth_unix_purge(); |
1670 | ||
1671 | exp_writeunlock(); | |
1672 | dprintk("nfsd: export shutdown complete.\n"); | |
1673 | } |