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Commit | Line | Data |
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1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
3 | * linux/fs/nfsd/export.c | |
4 | * | |
5 | * NFS exporting and validation. | |
6 | * | |
7 | * We maintain a list of clients, each of which has a list of | |
8 | * exports. To export an fs to a given client, you first have | |
9 | * to create the client entry with NFSCTL_ADDCLIENT, which | |
10 | * creates a client control block and adds it to the hash | |
11 | * table. Then, you call NFSCTL_EXPORT for each fs. | |
12 | * | |
13 | * | |
14 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> | |
15 | */ | |
16 | ||
17 | #include <linux/unistd.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/stat.h> |
20 | #include <linux/in.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/syscalls.h> | |
23 | #include <linux/rwsem.h> | |
24 | #include <linux/dcache.h> | |
25 | #include <linux/namei.h> | |
26 | #include <linux/mount.h> | |
27 | #include <linux/hash.h> | |
f35279d3 | 28 | #include <linux/module.h> |
a5694255 | 29 | #include <linux/exportfs.h> |
1da177e4 LT |
30 | |
31 | #include <linux/sunrpc/svc.h> | |
32 | #include <linux/nfsd/nfsd.h> | |
33 | #include <linux/nfsd/nfsfh.h> | |
34 | #include <linux/nfsd/syscall.h> | |
35 | #include <linux/lockd/bind.h> | |
e677bfe4 AA |
36 | #include <linux/sunrpc/msg_prot.h> |
37 | #include <linux/sunrpc/gss_api.h> | |
1da177e4 LT |
38 | |
39 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT | |
1da177e4 LT |
40 | |
41 | typedef struct auth_domain svc_client; | |
42 | typedef struct svc_export svc_export; | |
43 | ||
44 | static void exp_do_unexport(svc_export *unexp); | |
45 | static int exp_verify_string(char *cp, int max); | |
46 | ||
47 | /* | |
48 | * We have two caches. | |
49 | * One maps client+vfsmnt+dentry to export options - the export map | |
50 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
51 | * | |
52 | * The export options are actually stored in the first map, and the | |
53 | * second map contains a reference to the entry in the first map. | |
54 | */ | |
55 | ||
56 | #define EXPKEY_HASHBITS 8 | |
57 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
58 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
59 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
60 | ||
74cae61a | 61 | static void expkey_put(struct kref *ref) |
1da177e4 | 62 | { |
baab935f N |
63 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
64 | ||
65 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
66 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { | |
67 | dput(key->ek_dentry); | |
68 | mntput(key->ek_mnt); | |
1da177e4 | 69 | } |
baab935f N |
70 | auth_domain_put(key->ek_client); |
71 | kfree(key); | |
1da177e4 LT |
72 | } |
73 | ||
74 | static void expkey_request(struct cache_detail *cd, | |
75 | struct cache_head *h, | |
76 | char **bpp, int *blen) | |
77 | { | |
78 | /* client fsidtype \xfsid */ | |
79 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
80 | char type[5]; | |
81 | ||
82 | qword_add(bpp, blen, ek->ek_client->name); | |
83 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
84 | qword_add(bpp, blen, type); | |
85 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
86 | (*bpp)[-1] = '\n'; | |
87 | } | |
88 | ||
8d270f7f N |
89 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
90 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
74cae61a AB |
91 | static struct cache_detail svc_expkey_cache; |
92 | ||
1da177e4 LT |
93 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
94 | { | |
95 | /* client fsidtype fsid [path] */ | |
96 | char *buf; | |
97 | int len; | |
98 | struct auth_domain *dom = NULL; | |
99 | int err; | |
100 | int fsidtype; | |
101 | char *ep; | |
102 | struct svc_expkey key; | |
8d270f7f | 103 | struct svc_expkey *ek; |
1da177e4 LT |
104 | |
105 | if (mesg[mlen-1] != '\n') | |
106 | return -EINVAL; | |
107 | mesg[mlen-1] = 0; | |
108 | ||
109 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
110 | err = -ENOMEM; | |
111 | if (!buf) goto out; | |
112 | ||
113 | err = -EINVAL; | |
114 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
115 | goto out; | |
116 | ||
117 | err = -ENOENT; | |
118 | dom = auth_domain_find(buf); | |
119 | if (!dom) | |
120 | goto out; | |
121 | dprintk("found domain %s\n", buf); | |
122 | ||
123 | err = -EINVAL; | |
124 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
125 | goto out; | |
126 | fsidtype = simple_strtoul(buf, &ep, 10); | |
127 | if (*ep) | |
128 | goto out; | |
129 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 130 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
131 | goto out; |
132 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
133 | goto out; | |
134 | dprintk("found fsid length %d\n", len); | |
135 | if (len != key_len(fsidtype)) | |
136 | goto out; | |
137 | ||
138 | /* OK, we seem to have a valid key */ | |
139 | key.h.flags = 0; | |
140 | key.h.expiry_time = get_expiry(&mesg); | |
141 | if (key.h.expiry_time == 0) | |
142 | goto out; | |
143 | ||
144 | key.ek_client = dom; | |
145 | key.ek_fsidtype = fsidtype; | |
146 | memcpy(key.ek_fsid, buf, len); | |
147 | ||
8d270f7f N |
148 | ek = svc_expkey_lookup(&key); |
149 | err = -ENOMEM; | |
150 | if (!ek) | |
151 | goto out; | |
152 | ||
1da177e4 | 153 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 154 | err = -EINVAL; |
1da177e4 LT |
155 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
156 | goto out; | |
157 | dprintk("Path seems to be <%s>\n", buf); | |
158 | err = 0; | |
159 | if (len == 0) { | |
1da177e4 | 160 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 161 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 162 | if (ek) |
baab935f | 163 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f | 164 | else err = -ENOMEM; |
1da177e4 LT |
165 | } else { |
166 | struct nameidata nd; | |
1da177e4 LT |
167 | err = path_lookup(buf, 0, &nd); |
168 | if (err) | |
169 | goto out; | |
170 | ||
171 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
172 | key.ek_mnt = nd.mnt; |
173 | key.ek_dentry = nd.dentry; | |
1da177e4 | 174 | |
8d270f7f | 175 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 176 | if (ek) |
baab935f | 177 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f N |
178 | else |
179 | err = -ENOMEM; | |
1da177e4 LT |
180 | path_release(&nd); |
181 | } | |
182 | cache_flush(); | |
183 | out: | |
184 | if (dom) | |
185 | auth_domain_put(dom); | |
f99d49ad | 186 | kfree(buf); |
1da177e4 LT |
187 | return err; |
188 | } | |
189 | ||
190 | static int expkey_show(struct seq_file *m, | |
191 | struct cache_detail *cd, | |
192 | struct cache_head *h) | |
193 | { | |
194 | struct svc_expkey *ek ; | |
af6a4e28 | 195 | int i; |
1da177e4 LT |
196 | |
197 | if (h ==NULL) { | |
198 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
199 | return 0; | |
200 | } | |
201 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
202 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
203 | ek->ek_fsidtype); | |
204 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
205 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
206 | if (test_bit(CACHE_VALID, &h->flags) && |
207 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
208 | seq_printf(m, " "); | |
eab7e2e6 | 209 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
210 | } |
211 | seq_printf(m, "\n"); | |
212 | return 0; | |
213 | } | |
1da177e4 | 214 | |
8d270f7f | 215 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 216 | { |
8d270f7f N |
217 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
218 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
219 | ||
220 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
221 | orig->ek_client != new->ek_client || | |
222 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
223 | return 0; |
224 | return 1; | |
225 | } | |
226 | ||
8d270f7f N |
227 | static inline void expkey_init(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 | ||
efc36aa5 | 233 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
234 | new->ek_client = item->ek_client; |
235 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
236 | |
237 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
238 | } |
239 | ||
8d270f7f N |
240 | static inline void expkey_update(struct cache_head *cnew, |
241 | struct cache_head *citem) | |
1da177e4 | 242 | { |
8d270f7f N |
243 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
244 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
245 | ||
eab7e2e6 N |
246 | new->ek_mnt = mntget(item->ek_mnt); |
247 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
248 | } |
249 | ||
8d270f7f N |
250 | static struct cache_head *expkey_alloc(void) |
251 | { | |
252 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
253 | if (i) | |
254 | return &i->h; | |
255 | else | |
256 | return NULL; | |
257 | } | |
258 | ||
74cae61a | 259 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
260 | .owner = THIS_MODULE, |
261 | .hash_size = EXPKEY_HASHMAX, | |
262 | .hash_table = expkey_table, | |
263 | .name = "nfsd.fh", | |
264 | .cache_put = expkey_put, | |
265 | .cache_request = expkey_request, | |
266 | .cache_parse = expkey_parse, | |
267 | .cache_show = expkey_show, | |
268 | .match = expkey_match, | |
269 | .init = expkey_init, | |
270 | .update = expkey_update, | |
271 | .alloc = expkey_alloc, | |
272 | }; | |
273 | ||
274 | static struct svc_expkey * | |
275 | svc_expkey_lookup(struct svc_expkey *item) | |
276 | { | |
277 | struct cache_head *ch; | |
278 | int hash = item->ek_fsidtype; | |
279 | char * cp = (char*)item->ek_fsid; | |
280 | int len = key_len(item->ek_fsidtype); | |
281 | ||
282 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
283 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
284 | hash &= EXPKEY_HASHMASK; | |
285 | ||
286 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
287 | hash); | |
288 | if (ch) | |
289 | return container_of(ch, struct svc_expkey, h); | |
290 | else | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static struct svc_expkey * | |
295 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
296 | { | |
297 | struct cache_head *ch; | |
298 | int hash = new->ek_fsidtype; | |
299 | char * cp = (char*)new->ek_fsid; | |
300 | int len = key_len(new->ek_fsidtype); | |
301 | ||
302 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
303 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
304 | hash &= EXPKEY_HASHMASK; | |
305 | ||
306 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
307 | &old->h, hash); | |
308 | if (ch) | |
309 | return container_of(ch, struct svc_expkey, h); | |
310 | else | |
311 | return NULL; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | |
315 | #define EXPORT_HASHBITS 8 | |
316 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
317 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
318 | ||
319 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
320 | ||
93346919 MN |
321 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
322 | { | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < fsloc->locations_count; i++) { | |
326 | kfree(fsloc->locations[i].path); | |
327 | kfree(fsloc->locations[i].hosts); | |
328 | } | |
329 | kfree(fsloc->locations); | |
330 | } | |
331 | ||
baab935f | 332 | static void svc_export_put(struct kref *ref) |
1da177e4 | 333 | { |
baab935f N |
334 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
335 | dput(exp->ex_dentry); | |
336 | mntput(exp->ex_mnt); | |
337 | auth_domain_put(exp->ex_client); | |
b009a873 | 338 | kfree(exp->ex_path); |
93346919 | 339 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 340 | kfree(exp); |
1da177e4 LT |
341 | } |
342 | ||
343 | static void svc_export_request(struct cache_detail *cd, | |
344 | struct cache_head *h, | |
345 | char **bpp, int *blen) | |
346 | { | |
347 | /* client path */ | |
348 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
349 | char *pth; | |
350 | ||
351 | qword_add(bpp, blen, exp->ex_client->name); | |
352 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
353 | if (IS_ERR(pth)) { | |
354 | /* is this correct? */ | |
355 | (*bpp)[0] = '\n'; | |
356 | return; | |
357 | } | |
358 | qword_add(bpp, blen, pth); | |
359 | (*bpp)[-1] = '\n'; | |
360 | } | |
361 | ||
74cae61a AB |
362 | static struct svc_export *svc_export_update(struct svc_export *new, |
363 | struct svc_export *old); | |
4f7774c3 | 364 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 365 | |
af6a4e28 | 366 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) |
1da177e4 LT |
367 | { |
368 | ||
369 | /* We currently export only dirs and regular files. | |
370 | * This is what umountd does. | |
371 | */ | |
372 | if (!S_ISDIR(inode->i_mode) && | |
373 | !S_ISREG(inode->i_mode)) | |
374 | return -ENOTDIR; | |
375 | ||
376 | /* There are two requirements on a filesystem to be exportable. | |
377 | * 1: We must be able to identify the filesystem from a number. | |
378 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 379 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
380 | * 2: We must be able to find an inode from a filehandle. |
381 | * This means that s_export_op must be set. | |
382 | */ | |
383 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
af6a4e28 N |
384 | !(flags & NFSEXP_FSID) && |
385 | uuid == NULL) { | |
3e3b4800 | 386 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
387 | return -EINVAL; |
388 | } | |
389 | if (!inode->i_sb->s_export_op) { | |
390 | dprintk("exp_export: export of invalid fs type.\n"); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | /* Ok, we can export it */; | |
395 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
396 | inode->i_sb->s_export_op->find_exported_dentry = | |
397 | find_exported_dentry; | |
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 | /* | |
473 | * Just a quick sanity check; we could also try to check | |
474 | * whether this pseudoflavor is supported, but at worst | |
475 | * an unsupported pseudoflavor on the export would just | |
476 | * be a pseudoflavor that won't match the flavor of any | |
477 | * authenticated request. The administrator will | |
478 | * probably discover the problem when someone fails to | |
479 | * authenticate. | |
480 | */ | |
481 | if (f->pseudoflavor < 0) | |
482 | return -EINVAL; | |
483 | err = get_int(mesg, &f->flags); | |
484 | if (err) | |
485 | return err; | |
486 | /* Only some flags are allowed to differ between flavors: */ | |
487 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
488 | return -EINVAL; | |
489 | } | |
490 | exp->ex_nflavors = listsize; | |
491 | return 0; | |
492 | } | |
493 | ||
93346919 | 494 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
495 | static inline int |
496 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
497 | static inline int | |
498 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
499 | #endif |
500 | ||
1da177e4 LT |
501 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
502 | { | |
503 | /* client path expiry [flags anonuid anongid fsid] */ | |
504 | char *buf; | |
505 | int len; | |
506 | int err; | |
507 | struct auth_domain *dom = NULL; | |
508 | struct nameidata nd; | |
509 | struct svc_export exp, *expp; | |
510 | int an_int; | |
511 | ||
512 | nd.dentry = NULL; | |
b009a873 | 513 | exp.ex_path = NULL; |
1da177e4 | 514 | |
402acd29 N |
515 | /* fs locations */ |
516 | exp.ex_fslocs.locations = NULL; | |
517 | exp.ex_fslocs.locations_count = 0; | |
518 | exp.ex_fslocs.migrated = 0; | |
519 | ||
520 | exp.ex_uuid = NULL; | |
521 | ||
e677bfe4 AA |
522 | /* secinfo */ |
523 | exp.ex_nflavors = 0; | |
524 | ||
1da177e4 LT |
525 | if (mesg[mlen-1] != '\n') |
526 | return -EINVAL; | |
527 | mesg[mlen-1] = 0; | |
528 | ||
529 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
530 | err = -ENOMEM; | |
531 | if (!buf) goto out; | |
532 | ||
533 | /* client */ | |
534 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
535 | err = -EINVAL; | |
536 | if (len <= 0) goto out; | |
537 | ||
538 | err = -ENOENT; | |
539 | dom = auth_domain_find(buf); | |
540 | if (!dom) | |
541 | goto out; | |
542 | ||
543 | /* path */ | |
544 | err = -EINVAL; | |
545 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
546 | goto out; | |
547 | err = path_lookup(buf, 0, &nd); | |
cd156549 | 548 | if (err) goto out_no_path; |
1da177e4 LT |
549 | |
550 | exp.h.flags = 0; | |
551 | exp.ex_client = dom; | |
552 | exp.ex_mnt = nd.mnt; | |
553 | exp.ex_dentry = nd.dentry; | |
b009a873 BF |
554 | exp.ex_path = kstrdup(buf, GFP_KERNEL); |
555 | err = -ENOMEM; | |
556 | if (!exp.ex_path) | |
557 | goto out; | |
1da177e4 LT |
558 | |
559 | /* expiry */ | |
560 | err = -EINVAL; | |
561 | exp.h.expiry_time = get_expiry(&mesg); | |
562 | if (exp.h.expiry_time == 0) | |
563 | goto out; | |
564 | ||
565 | /* flags */ | |
566 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
567 | if (err == -ENOENT) { |
568 | err = 0; | |
1da177e4 | 569 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 570 | } else { |
1da177e4 LT |
571 | if (err || an_int < 0) goto out; |
572 | exp.ex_flags= an_int; | |
573 | ||
574 | /* anon uid */ | |
575 | err = get_int(&mesg, &an_int); | |
576 | if (err) goto out; | |
577 | exp.ex_anon_uid= an_int; | |
578 | ||
579 | /* anon gid */ | |
580 | err = get_int(&mesg, &an_int); | |
581 | if (err) goto out; | |
582 | exp.ex_anon_gid= an_int; | |
583 | ||
584 | /* fsid */ | |
585 | err = get_int(&mesg, &an_int); | |
586 | if (err) goto out; | |
587 | exp.ex_fsid = an_int; | |
588 | ||
af6a4e28 N |
589 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
590 | if (strcmp(buf, "fsloc") == 0) | |
591 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
592 | else if (strcmp(buf, "uuid") == 0) { | |
593 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
594 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
595 | if (len != 16) | |
596 | err = -EINVAL; | |
597 | else { | |
598 | exp.ex_uuid = | |
599 | kmemdup(buf, 16, GFP_KERNEL); | |
600 | if (exp.ex_uuid == NULL) | |
601 | err = -ENOMEM; | |
602 | } | |
e677bfe4 AA |
603 | } else if (strcmp(buf, "secinfo") == 0) |
604 | err = secinfo_parse(&mesg, buf, &exp); | |
605 | else | |
af6a4e28 N |
606 | /* quietly ignore unknown words and anything |
607 | * following. Newer user-space can try to set | |
608 | * new values, then see what the result was. | |
609 | */ | |
610 | break; | |
611 | if (err) | |
612 | goto out; | |
613 | } | |
93346919 | 614 | |
af6a4e28 N |
615 | err = check_export(nd.dentry->d_inode, exp.ex_flags, |
616 | exp.ex_uuid); | |
617 | if (err) goto out; | |
1da177e4 LT |
618 | } |
619 | ||
4f7774c3 | 620 | expp = svc_export_lookup(&exp); |
1da177e4 | 621 | if (expp) |
4f7774c3 N |
622 | expp = svc_export_update(&exp, expp); |
623 | else | |
624 | err = -ENOMEM; | |
1da177e4 | 625 | cache_flush(); |
4f7774c3 N |
626 | if (expp == NULL) |
627 | err = -ENOMEM; | |
628 | else | |
629 | exp_put(expp); | |
1da177e4 | 630 | out: |
af6a4e28 N |
631 | nfsd4_fslocs_free(&exp.ex_fslocs); |
632 | kfree(exp.ex_uuid); | |
b009a873 | 633 | kfree(exp.ex_path); |
1da177e4 LT |
634 | if (nd.dentry) |
635 | path_release(&nd); | |
cd156549 | 636 | out_no_path: |
1da177e4 LT |
637 | if (dom) |
638 | auth_domain_put(dom); | |
f99d49ad | 639 | kfree(buf); |
1da177e4 LT |
640 | return err; |
641 | } | |
642 | ||
93346919 MN |
643 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
644 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
91fe39d3 | 645 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
646 | |
647 | static int svc_export_show(struct seq_file *m, | |
648 | struct cache_detail *cd, | |
649 | struct cache_head *h) | |
650 | { | |
651 | struct svc_export *exp ; | |
652 | ||
653 | if (h ==NULL) { | |
654 | seq_puts(m, "#path domain(flags)\n"); | |
655 | return 0; | |
656 | } | |
657 | exp = container_of(h, struct svc_export, h); | |
658 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
659 | seq_putc(m, '\t'); | |
660 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
661 | seq_putc(m, '('); | |
662 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 663 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
664 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
665 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
666 | if (exp->ex_uuid) { |
667 | int i; | |
668 | seq_puts(m, ",uuid="); | |
669 | for (i=0; i<16; i++) { | |
670 | if ((i&3) == 0 && i) | |
671 | seq_putc(m, ':'); | |
672 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
673 | } | |
674 | } | |
91fe39d3 | 675 | show_secinfo(m, exp); |
af6a4e28 | 676 | } |
1da177e4 LT |
677 | seq_puts(m, ")\n"); |
678 | return 0; | |
679 | } | |
4f7774c3 | 680 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 681 | { |
4f7774c3 N |
682 | struct svc_export *orig = container_of(a, struct svc_export, h); |
683 | struct svc_export *new = container_of(b, struct svc_export, h); | |
684 | return orig->ex_client == new->ex_client && | |
685 | orig->ex_dentry == new->ex_dentry && | |
686 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 687 | } |
4f7774c3 N |
688 | |
689 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 690 | { |
4f7774c3 N |
691 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
692 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
693 | ||
efc36aa5 | 694 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
695 | new->ex_client = item->ex_client; |
696 | new->ex_dentry = dget(item->ex_dentry); | |
697 | new->ex_mnt = mntget(item->ex_mnt); | |
b009a873 | 698 | new->ex_path = NULL; |
93346919 MN |
699 | new->ex_fslocs.locations = NULL; |
700 | new->ex_fslocs.locations_count = 0; | |
701 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
702 | } |
703 | ||
4f7774c3 | 704 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 705 | { |
4f7774c3 N |
706 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
707 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 708 | int i; |
4f7774c3 | 709 | |
1da177e4 LT |
710 | new->ex_flags = item->ex_flags; |
711 | new->ex_anon_uid = item->ex_anon_uid; | |
712 | new->ex_anon_gid = item->ex_anon_gid; | |
713 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
714 | new->ex_uuid = item->ex_uuid; |
715 | item->ex_uuid = NULL; | |
b009a873 BF |
716 | new->ex_path = item->ex_path; |
717 | item->ex_path = NULL; | |
93346919 MN |
718 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
719 | item->ex_fslocs.locations = NULL; | |
720 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
721 | item->ex_fslocs.locations_count = 0; | |
722 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
723 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
724 | new->ex_nflavors = item->ex_nflavors; |
725 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
726 | new->ex_flavors[i] = item->ex_flavors[i]; | |
727 | } | |
1da177e4 LT |
728 | } |
729 | ||
4f7774c3 N |
730 | static struct cache_head *svc_export_alloc(void) |
731 | { | |
732 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
733 | if (i) | |
734 | return &i->h; | |
735 | else | |
736 | return NULL; | |
737 | } | |
738 | ||
739 | struct cache_detail svc_export_cache = { | |
740 | .owner = THIS_MODULE, | |
741 | .hash_size = EXPORT_HASHMAX, | |
742 | .hash_table = export_table, | |
743 | .name = "nfsd.export", | |
744 | .cache_put = svc_export_put, | |
745 | .cache_request = svc_export_request, | |
746 | .cache_parse = svc_export_parse, | |
747 | .cache_show = svc_export_show, | |
748 | .match = svc_export_match, | |
749 | .init = svc_export_init, | |
750 | .update = export_update, | |
751 | .alloc = svc_export_alloc, | |
752 | }; | |
753 | ||
754 | static struct svc_export * | |
755 | svc_export_lookup(struct svc_export *exp) | |
756 | { | |
757 | struct cache_head *ch; | |
758 | int hash; | |
759 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
760 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
761 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
762 | ||
763 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
764 | hash); | |
765 | if (ch) | |
766 | return container_of(ch, struct svc_export, h); | |
767 | else | |
768 | return NULL; | |
769 | } | |
770 | ||
74cae61a | 771 | static struct svc_export * |
4f7774c3 N |
772 | svc_export_update(struct svc_export *new, struct svc_export *old) |
773 | { | |
774 | struct cache_head *ch; | |
775 | int hash; | |
776 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
777 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
778 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
779 | ||
780 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
781 | &old->h, | |
782 | hash); | |
783 | if (ch) | |
784 | return container_of(ch, struct svc_export, h); | |
785 | else | |
786 | return NULL; | |
787 | } | |
1da177e4 LT |
788 | |
789 | ||
74cae61a | 790 | static struct svc_expkey * |
1da177e4 LT |
791 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
792 | { | |
793 | struct svc_expkey key, *ek; | |
794 | int err; | |
795 | ||
796 | if (!clp) | |
2d3bb252 | 797 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
798 | |
799 | key.ek_client = clp; | |
800 | key.ek_fsidtype = fsid_type; | |
801 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
802 | ||
8d270f7f | 803 | ek = svc_expkey_lookup(&key); |
2d3bb252 BF |
804 | if (ek == NULL) |
805 | return ERR_PTR(-ENOMEM); | |
806 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
807 | if (err) | |
808 | return ERR_PTR(err); | |
1da177e4 LT |
809 | return ek; |
810 | } | |
811 | ||
812 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
813 | struct svc_export *exp) | |
814 | { | |
815 | struct svc_expkey key, *ek; | |
816 | ||
817 | key.ek_client = clp; | |
818 | key.ek_fsidtype = fsid_type; | |
819 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
820 | key.ek_mnt = exp->ex_mnt; |
821 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
822 | key.h.expiry_time = NEVER; |
823 | key.h.flags = 0; | |
824 | ||
8d270f7f N |
825 | ek = svc_expkey_lookup(&key); |
826 | if (ek) | |
827 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 828 | if (ek) { |
baab935f | 829 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
830 | return 0; |
831 | } | |
832 | return -ENOMEM; | |
833 | } | |
834 | ||
835 | /* | |
836 | * Find the client's export entry matching xdev/xino. | |
837 | */ | |
838 | static inline struct svc_expkey * | |
839 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
840 | { | |
841 | u32 fsidv[3]; | |
842 | ||
843 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
844 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
845 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 846 | } |
af6a4e28 N |
847 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
848 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
849 | } |
850 | ||
851 | /* | |
852 | * Find the client's export entry matching fsid | |
853 | */ | |
854 | static inline struct svc_expkey * | |
855 | exp_get_fsid_key(svc_client *clp, int fsid) | |
856 | { | |
857 | u32 fsidv[2]; | |
858 | ||
af6a4e28 | 859 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 860 | |
af6a4e28 | 861 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
862 | } |
863 | ||
cce76f9b AB |
864 | static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt, |
865 | struct dentry *dentry, | |
866 | struct cache_req *reqp) | |
1da177e4 LT |
867 | { |
868 | struct svc_export *exp, key; | |
2d3bb252 | 869 | int err; |
1da177e4 LT |
870 | |
871 | if (!clp) | |
2d3bb252 | 872 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
873 | |
874 | key.ex_client = clp; | |
875 | key.ex_mnt = mnt; | |
876 | key.ex_dentry = dentry; | |
877 | ||
4f7774c3 | 878 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
879 | if (exp == NULL) |
880 | return ERR_PTR(-ENOMEM); | |
881 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
882 | if (err) | |
883 | return ERR_PTR(err); | |
1da177e4 LT |
884 | return exp; |
885 | } | |
886 | ||
887 | /* | |
888 | * Find the export entry for a given dentry. | |
889 | */ | |
cce76f9b AB |
890 | static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt, |
891 | struct dentry *dentry, | |
892 | struct cache_req *reqp) | |
1da177e4 LT |
893 | { |
894 | svc_export *exp; | |
895 | ||
896 | dget(dentry); | |
897 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
898 | ||
2d3bb252 | 899 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { |
1da177e4 LT |
900 | struct dentry *parent; |
901 | ||
902 | parent = dget_parent(dentry); | |
903 | dput(dentry); | |
904 | dentry = parent; | |
905 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
906 | } | |
907 | dput(dentry); | |
908 | return exp; | |
909 | } | |
910 | ||
911 | /* | |
912 | * Hashtable locking. Write locks are placed only by user processes | |
913 | * wanting to modify export information. | |
914 | * Write locking only done in this file. Read locking | |
915 | * needed externally. | |
916 | */ | |
917 | ||
918 | static DECLARE_RWSEM(hash_sem); | |
919 | ||
920 | void | |
921 | exp_readlock(void) | |
922 | { | |
923 | down_read(&hash_sem); | |
924 | } | |
925 | ||
926 | static inline void | |
927 | exp_writelock(void) | |
928 | { | |
929 | down_write(&hash_sem); | |
930 | } | |
931 | ||
932 | void | |
933 | exp_readunlock(void) | |
934 | { | |
935 | up_read(&hash_sem); | |
936 | } | |
937 | ||
938 | static inline void | |
939 | exp_writeunlock(void) | |
940 | { | |
941 | up_write(&hash_sem); | |
942 | } | |
943 | ||
944 | static void exp_fsid_unhash(struct svc_export *exp) | |
945 | { | |
946 | struct svc_expkey *ek; | |
947 | ||
948 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
949 | return; | |
950 | ||
951 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
2d3bb252 | 952 | if (!IS_ERR(ek)) { |
1da177e4 | 953 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 954 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
955 | } |
956 | svc_expkey_cache.nextcheck = get_seconds(); | |
957 | } | |
958 | ||
959 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
960 | { | |
961 | u32 fsid[2]; | |
962 | ||
963 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
964 | return 0; | |
965 | ||
af6a4e28 N |
966 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
967 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
968 | } |
969 | ||
970 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
971 | { | |
972 | u32 fsid[2]; | |
973 | struct inode *inode = exp->ex_dentry->d_inode; | |
974 | dev_t dev = inode->i_sb->s_dev; | |
975 | ||
976 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
977 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
978 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 979 | } |
af6a4e28 N |
980 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
981 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
982 | } |
983 | ||
984 | static void exp_unhash(struct svc_export *exp) | |
985 | { | |
986 | struct svc_expkey *ek; | |
987 | struct inode *inode = exp->ex_dentry->d_inode; | |
988 | ||
989 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
2d3bb252 | 990 | if (!IS_ERR(ek)) { |
1da177e4 | 991 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 992 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
993 | } |
994 | svc_expkey_cache.nextcheck = get_seconds(); | |
995 | } | |
996 | ||
997 | /* | |
998 | * Export a file system. | |
999 | */ | |
1000 | int | |
1001 | exp_export(struct nfsctl_export *nxp) | |
1002 | { | |
1003 | svc_client *clp; | |
1004 | struct svc_export *exp = NULL; | |
1005 | struct svc_export new; | |
1006 | struct svc_expkey *fsid_key = NULL; | |
1007 | struct nameidata nd; | |
1008 | int err; | |
1009 | ||
1010 | /* Consistency check */ | |
1011 | err = -EINVAL; | |
1012 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1013 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1014 | goto out; | |
1015 | ||
1016 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
1017 | nxp->ex_client, nxp->ex_path, | |
1018 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
1019 | nxp->ex_flags); | |
1020 | ||
1021 | /* Try to lock the export table for update */ | |
1022 | exp_writelock(); | |
1023 | ||
1024 | /* Look up client info */ | |
1025 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
1026 | goto out_unlock; | |
1027 | ||
1028 | ||
1029 | /* Look up the dentry */ | |
1030 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1031 | if (err) | |
1032 | goto out_unlock; | |
1033 | err = -EINVAL; | |
1034 | ||
1035 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
1036 | ||
f988443a N |
1037 | memset(&new, 0, sizeof(new)); |
1038 | ||
1da177e4 LT |
1039 | /* must make sure there won't be an ex_fsid clash */ |
1040 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
2d3bb252 | 1041 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
eab7e2e6 N |
1042 | fsid_key->ek_mnt && |
1043 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
1044 | goto finish; |
1045 | ||
2d3bb252 | 1046 | if (!IS_ERR(exp)) { |
1da177e4 LT |
1047 | /* just a flags/id/fsid update */ |
1048 | ||
1049 | exp_fsid_unhash(exp); | |
1050 | exp->ex_flags = nxp->ex_flags; | |
1051 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1052 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1053 | exp->ex_fsid = nxp->ex_dev; | |
1054 | ||
1055 | err = exp_fsid_hash(clp, exp); | |
1056 | goto finish; | |
1057 | } | |
1058 | ||
af6a4e28 | 1059 | err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL); |
1da177e4 LT |
1060 | if (err) goto finish; |
1061 | ||
1062 | err = -ENOMEM; | |
1063 | ||
1064 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1065 | ||
1066 | new.h.expiry_time = NEVER; | |
1067 | new.h.flags = 0; | |
f988443a N |
1068 | new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL); |
1069 | if (!new.ex_path) | |
1070 | goto finish; | |
1da177e4 LT |
1071 | new.ex_client = clp; |
1072 | new.ex_mnt = nd.mnt; | |
1073 | new.ex_dentry = nd.dentry; | |
1074 | new.ex_flags = nxp->ex_flags; | |
1075 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1076 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1077 | new.ex_fsid = nxp->ex_dev; | |
1078 | ||
4f7774c3 N |
1079 | exp = svc_export_lookup(&new); |
1080 | if (exp) | |
1081 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1082 | |
4f7774c3 | 1083 | if (!exp) |
1da177e4 LT |
1084 | goto finish; |
1085 | ||
1da177e4 LT |
1086 | if (exp_hash(clp, exp) || |
1087 | exp_fsid_hash(clp, exp)) { | |
1088 | /* failed to create at least one index */ | |
1089 | exp_do_unexport(exp); | |
1090 | cache_flush(); | |
f988443a N |
1091 | } else |
1092 | err = 0; | |
1da177e4 | 1093 | finish: |
f988443a N |
1094 | if (new.ex_path) |
1095 | kfree(new.ex_path); | |
1da177e4 LT |
1096 | if (exp) |
1097 | exp_put(exp); | |
1098 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 1099 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
1100 | if (clp) |
1101 | auth_domain_put(clp); | |
1102 | path_release(&nd); | |
1103 | out_unlock: | |
1104 | exp_writeunlock(); | |
1105 | out: | |
1106 | return err; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Unexport a file system. The export entry has already | |
1111 | * been removed from the client's list of exported fs's. | |
1112 | */ | |
1113 | static void | |
1114 | exp_do_unexport(svc_export *unexp) | |
1115 | { | |
1116 | unexp->h.expiry_time = get_seconds()-1; | |
1117 | svc_export_cache.nextcheck = get_seconds(); | |
1118 | exp_unhash(unexp); | |
1119 | exp_fsid_unhash(unexp); | |
1120 | } | |
1121 | ||
1122 | ||
1123 | /* | |
1124 | * unexport syscall. | |
1125 | */ | |
1126 | int | |
1127 | exp_unexport(struct nfsctl_export *nxp) | |
1128 | { | |
1129 | struct auth_domain *dom; | |
1130 | svc_export *exp; | |
1131 | struct nameidata nd; | |
1132 | int err; | |
1133 | ||
1134 | /* Consistency check */ | |
1135 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1136 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1137 | return -EINVAL; | |
1138 | ||
1139 | exp_writelock(); | |
1140 | ||
1141 | err = -EINVAL; | |
1142 | dom = auth_domain_find(nxp->ex_client); | |
1143 | if (!dom) { | |
1144 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1145 | goto out_unlock; | |
1146 | } | |
1147 | ||
1148 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1149 | if (err) | |
1150 | goto out_domain; | |
1151 | ||
1152 | err = -EINVAL; | |
1153 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
1154 | path_release(&nd); | |
2d3bb252 | 1155 | if (IS_ERR(exp)) |
1da177e4 LT |
1156 | goto out_domain; |
1157 | ||
1158 | exp_do_unexport(exp); | |
1159 | exp_put(exp); | |
1160 | err = 0; | |
1161 | ||
1162 | out_domain: | |
1163 | auth_domain_put(dom); | |
1164 | cache_flush(); | |
1165 | out_unlock: | |
1166 | exp_writeunlock(); | |
1167 | return err; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Obtain the root fh on behalf of a client. | |
1172 | * This could be done in user space, but I feel that it adds some safety | |
1173 | * since its harder to fool a kernel module than a user space program. | |
1174 | */ | |
1175 | int | |
1176 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
1177 | { | |
1178 | struct svc_export *exp; | |
1179 | struct nameidata nd; | |
1180 | struct inode *inode; | |
1181 | struct svc_fh fh; | |
1182 | int err; | |
1183 | ||
1184 | err = -EPERM; | |
1185 | /* NB: we probably ought to check that it's NUL-terminated */ | |
1186 | if (path_lookup(path, 0, &nd)) { | |
1187 | printk("nfsd: exp_rootfh path not found %s", path); | |
1188 | return err; | |
1189 | } | |
1190 | inode = nd.dentry->d_inode; | |
1191 | ||
1192 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
1193 | path, nd.dentry, clp->name, | |
1194 | inode->i_sb->s_id, inode->i_ino); | |
1195 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
4b41bd85 BF |
1196 | if (IS_ERR(exp)) { |
1197 | err = PTR_ERR(exp); | |
1198 | goto out; | |
1199 | } | |
1da177e4 LT |
1200 | |
1201 | /* | |
1202 | * fh must be initialized before calling fh_compose | |
1203 | */ | |
1204 | fh_init(&fh, maxsize); | |
1205 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1206 | err = -EINVAL; | |
1207 | else | |
1208 | err = 0; | |
1209 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1210 | fh_put(&fh); | |
1211 | exp_put(exp); | |
1212 | out: | |
1213 | path_release(&nd); | |
1214 | return err; | |
1215 | } | |
1216 | ||
cce76f9b AB |
1217 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, |
1218 | u32 *fsidv, struct cache_req *reqp) | |
eab7e2e6 N |
1219 | { |
1220 | struct svc_export *exp; | |
1221 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 1222 | if (IS_ERR(ek)) |
eab7e2e6 N |
1223 | return ERR_PTR(PTR_ERR(ek)); |
1224 | ||
1225 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
baab935f | 1226 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 1227 | |
2d3bb252 | 1228 | if (IS_ERR(exp)) |
eab7e2e6 N |
1229 | return ERR_PTR(PTR_ERR(exp)); |
1230 | return exp; | |
1231 | } | |
1232 | ||
32c1eb0c AA |
1233 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
1234 | { | |
1235 | struct exp_flavor_info *f; | |
1236 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1237 | ||
1238 | /* legacy gss-only clients are always OK: */ | |
1239 | if (exp->ex_client == rqstp->rq_gssclient) | |
1240 | return 0; | |
1241 | /* ip-address based client; check sec= export option: */ | |
1242 | for (f = exp->ex_flavors; f < end; f++) { | |
1243 | if (f->pseudoflavor == rqstp->rq_flavor) | |
1244 | return 0; | |
1245 | } | |
1246 | /* defaults in absence of sec= options: */ | |
1247 | if (exp->ex_nflavors == 0) { | |
1248 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
1249 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
1250 | return 0; | |
1251 | } | |
1252 | return nfserr_wrongsec; | |
1253 | } | |
1254 | ||
0989a788 | 1255 | /* |
2ea2209f BF |
1256 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1257 | * auth_unix client) if it's available and has secinfo information; | |
1258 | * otherwise, will try to use rq_gssclient. | |
1259 | * | |
0989a788 BF |
1260 | * Called from functions that handle requests; functions that do work on |
1261 | * behalf of mountd are passed a single client name to use, and should | |
1262 | * use exp_get_by_name() or exp_find(). | |
1263 | */ | |
1264 | struct svc_export * | |
1265 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt, | |
1266 | struct dentry *dentry) | |
1267 | { | |
9a25b96c | 1268 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1269 | |
1270 | if (rqstp->rq_client == NULL) | |
1271 | goto gss; | |
3ab4d8b1 | 1272 | |
2ea2209f BF |
1273 | /* First try the auth_unix client: */ |
1274 | exp = exp_get_by_name(rqstp->rq_client, mnt, dentry, | |
1275 | &rqstp->rq_chandle); | |
1276 | if (PTR_ERR(exp) == -ENOENT) | |
1277 | goto gss; | |
1278 | if (IS_ERR(exp)) | |
1279 | return exp; | |
1280 | /* If it has secinfo, assume there are no gss/... clients */ | |
1281 | if (exp->ex_nflavors > 0) | |
1282 | return exp; | |
1283 | gss: | |
1284 | /* Otherwise, try falling back on gss client */ | |
1285 | if (rqstp->rq_gssclient == NULL) | |
1286 | return exp; | |
1287 | gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry, | |
1288 | &rqstp->rq_chandle); | |
1289 | if (PTR_ERR(gssexp) == -ENOENT) | |
1290 | return exp; | |
9a25b96c | 1291 | if (!IS_ERR(exp)) |
2ea2209f BF |
1292 | exp_put(exp); |
1293 | return gssexp; | |
0989a788 BF |
1294 | } |
1295 | ||
1296 | struct svc_export * | |
1297 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1298 | { | |
9a25b96c | 1299 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
1300 | |
1301 | if (rqstp->rq_client == NULL) | |
1302 | goto gss; | |
3ab4d8b1 | 1303 | |
2ea2209f BF |
1304 | /* First try the auth_unix client: */ |
1305 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
1306 | if (PTR_ERR(exp) == -ENOENT) | |
1307 | goto gss; | |
1308 | if (IS_ERR(exp)) | |
1309 | return exp; | |
1310 | /* If it has secinfo, assume there are no gss/... clients */ | |
1311 | if (exp->ex_nflavors > 0) | |
1312 | return exp; | |
1313 | gss: | |
1314 | /* Otherwise, try falling back on gss client */ | |
1315 | if (rqstp->rq_gssclient == NULL) | |
1316 | return exp; | |
1317 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
1318 | &rqstp->rq_chandle); | |
1319 | if (PTR_ERR(gssexp) == -ENOENT) | |
1320 | return exp; | |
9a25b96c | 1321 | if (!IS_ERR(exp)) |
2ea2209f BF |
1322 | exp_put(exp); |
1323 | return gssexp; | |
0989a788 BF |
1324 | } |
1325 | ||
1326 | struct svc_export * | |
1327 | rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt, | |
1328 | struct dentry *dentry) | |
1329 | { | |
2ea2209f BF |
1330 | struct svc_export *exp; |
1331 | ||
1332 | dget(dentry); | |
1333 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); | |
3ab4d8b1 | 1334 | |
2ea2209f BF |
1335 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { |
1336 | struct dentry *parent; | |
1337 | ||
1338 | parent = dget_parent(dentry); | |
1339 | dput(dentry); | |
1340 | dentry = parent; | |
1341 | exp = rqst_exp_get_by_name(rqstp, mnt, dentry); | |
1342 | } | |
1343 | dput(dentry); | |
1344 | return exp; | |
0989a788 | 1345 | } |
eab7e2e6 | 1346 | |
1da177e4 LT |
1347 | /* |
1348 | * Called when we need the filehandle for the root of the pseudofs, | |
1349 | * for a given NFSv4 client. The root is defined to be the | |
1350 | * export point with fsid==0 | |
1351 | */ | |
c7afef1f | 1352 | __be32 |
df547efb | 1353 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1354 | { |
eab7e2e6 | 1355 | struct svc_export *exp; |
c7afef1f | 1356 | __be32 rv; |
1da177e4 LT |
1357 | u32 fsidv[2]; |
1358 | ||
af6a4e28 | 1359 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); |
1da177e4 | 1360 | |
0989a788 | 1361 | exp = rqst_exp_find(rqstp, FSID_NUM, fsidv); |
2d3bb252 BF |
1362 | if (PTR_ERR(exp) == -ENOENT) |
1363 | return nfserr_perm; | |
6899320c BF |
1364 | if (IS_ERR(exp)) |
1365 | return nfserrno(PTR_ERR(exp)); | |
d0ebd9c0 | 1366 | rv = fh_compose(fhp, exp, exp->ex_dentry, NULL); |
32c1eb0c AA |
1367 | if (rv) |
1368 | goto out; | |
1369 | rv = check_nfsd_access(exp, rqstp); | |
1370 | out: | |
d0ebd9c0 | 1371 | exp_put(exp); |
1da177e4 LT |
1372 | return rv; |
1373 | } | |
1374 | ||
1375 | /* Iterator */ | |
1376 | ||
1377 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1378 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1379 | { |
1380 | loff_t n = *pos; | |
1381 | unsigned hash, export; | |
1382 | struct cache_head *ch; | |
1383 | ||
1384 | exp_readlock(); | |
1385 | read_lock(&svc_export_cache.hash_lock); | |
1386 | if (!n--) | |
bc6f02e5 | 1387 | return SEQ_START_TOKEN; |
1da177e4 LT |
1388 | hash = n >> 32; |
1389 | export = n & ((1LL<<32) - 1); | |
1390 | ||
1391 | ||
1392 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1393 | if (!export--) | |
1394 | return ch; | |
1395 | n &= ~((1LL<<32) - 1); | |
1396 | do { | |
1397 | hash++; | |
1398 | n += 1LL<<32; | |
1399 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1400 | if (hash >= EXPORT_HASHMAX) | |
1401 | return NULL; | |
1402 | *pos = n+1; | |
1403 | return export_table[hash]; | |
1404 | } | |
1405 | ||
1406 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1407 | { | |
1408 | struct cache_head *ch = p; | |
1409 | int hash = (*pos >> 32); | |
1410 | ||
bc6f02e5 | 1411 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1412 | hash = 0; |
1413 | else if (ch->next == NULL) { | |
1414 | hash++; | |
1415 | *pos += 1LL<<32; | |
1416 | } else { | |
1417 | ++*pos; | |
1418 | return ch->next; | |
1419 | } | |
1420 | *pos &= ~((1LL<<32) - 1); | |
1421 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1422 | hash++; | |
1423 | *pos += 1LL<<32; | |
1424 | } | |
1425 | if (hash >= EXPORT_HASHMAX) | |
1426 | return NULL; | |
1427 | ++*pos; | |
1428 | return export_table[hash]; | |
1429 | } | |
1430 | ||
1431 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1432 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1433 | { |
1434 | read_unlock(&svc_export_cache.hash_lock); | |
1435 | exp_readunlock(); | |
1436 | } | |
1437 | ||
1438 | static struct flags { | |
1439 | int flag; | |
1440 | char *name[2]; | |
1441 | } expflags[] = { | |
1442 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1443 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1444 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1445 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1446 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1447 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1448 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1449 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1450 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1451 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1452 | #ifdef MSNFS | |
1453 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1454 | #endif | |
1455 | { 0, {"", ""}} | |
1456 | }; | |
1457 | ||
ac34cdb0 | 1458 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1459 | { |
1da177e4 | 1460 | struct flags *flg; |
ac34cdb0 | 1461 | int state, first = 0; |
1da177e4 LT |
1462 | |
1463 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1464 | if (flg->flag & ~mask) |
1465 | continue; | |
1466 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1467 | if (*flg->name[state]) |
1468 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1469 | } | |
ac34cdb0 BF |
1470 | } |
1471 | ||
91fe39d3 BF |
1472 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1473 | { | |
1474 | seq_printf(m, ","); | |
1475 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1476 | } | |
1477 | ||
1478 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) | |
1479 | { | |
1480 | struct exp_flavor_info *f; | |
1481 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
1482 | int lastflags = 0, first = 0; | |
1483 | ||
1484 | if (exp->ex_nflavors == 0) | |
1485 | return; | |
1486 | for (f = exp->ex_flavors; f < end; f++) { | |
1487 | if (first || f->flags != lastflags) { | |
1488 | if (!first) | |
1489 | show_secinfo_flags(m, lastflags); | |
1490 | seq_printf(m, ",sec=%d", f->pseudoflavor); | |
1491 | lastflags = f->flags; | |
1492 | } else { | |
1493 | seq_printf(m, ":%d", f->pseudoflavor); | |
1494 | } | |
1495 | } | |
1496 | show_secinfo_flags(m, lastflags); | |
1497 | } | |
1498 | ||
ac34cdb0 BF |
1499 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1500 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1501 | { | |
1502 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1503 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1504 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1505 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1506 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1507 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1508 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1509 | if (fsloc && fsloc->locations_count > 0) { |
1510 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1511 | int i; | |
1512 | ||
ac34cdb0 | 1513 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1514 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1515 | seq_putc(m, '@'); | |
1516 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1517 | for (i = 1; i < fsloc->locations_count; i++) { | |
1518 | seq_putc(m, ';'); | |
1519 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1520 | seq_putc(m, '@'); | |
1521 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1522 | } | |
1523 | } | |
1da177e4 LT |
1524 | } |
1525 | ||
1526 | static int e_show(struct seq_file *m, void *p) | |
1527 | { | |
1528 | struct cache_head *cp = p; | |
1529 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1530 | |
bc6f02e5 | 1531 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1532 | seq_puts(m, "# Version 1.1\n"); |
1533 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1da177e4 LT |
1537 | cache_get(&exp->h); |
1538 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1539 | return 0; | |
baab935f | 1540 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1541 | return svc_export_show(m, &svc_export_cache, cp); |
1542 | } | |
1543 | ||
1544 | struct seq_operations nfs_exports_op = { | |
1545 | .start = e_start, | |
1546 | .next = e_next, | |
1547 | .stop = e_stop, | |
1548 | .show = e_show, | |
1549 | }; | |
1550 | ||
1551 | /* | |
1552 | * Add or modify a client. | |
1553 | * Change requests may involve the list of host addresses. The list of | |
1554 | * exports and possibly existing uid maps are left untouched. | |
1555 | */ | |
1556 | int | |
1557 | exp_addclient(struct nfsctl_client *ncp) | |
1558 | { | |
1559 | struct auth_domain *dom; | |
1560 | int i, err; | |
1561 | ||
1562 | /* First, consistency check. */ | |
1563 | err = -EINVAL; | |
1564 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1565 | goto out; | |
1566 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1567 | goto out; | |
1568 | ||
1569 | /* Lock the hashtable */ | |
1570 | exp_writelock(); | |
1571 | ||
1572 | dom = unix_domain_find(ncp->cl_ident); | |
1573 | ||
1574 | err = -ENOMEM; | |
1575 | if (!dom) | |
1576 | goto out_unlock; | |
1577 | ||
1578 | /* Insert client into hashtable. */ | |
1579 | for (i = 0; i < ncp->cl_naddr; i++) | |
1580 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1581 | ||
1582 | auth_unix_forget_old(dom); | |
1583 | auth_domain_put(dom); | |
1584 | ||
1585 | err = 0; | |
1586 | ||
1587 | out_unlock: | |
1588 | exp_writeunlock(); | |
1589 | out: | |
1590 | return err; | |
1591 | } | |
1592 | ||
1593 | /* | |
1594 | * Delete a client given an identifier. | |
1595 | */ | |
1596 | int | |
1597 | exp_delclient(struct nfsctl_client *ncp) | |
1598 | { | |
1599 | int err; | |
1600 | struct auth_domain *dom; | |
1601 | ||
1602 | err = -EINVAL; | |
1603 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1604 | goto out; | |
1605 | ||
1606 | /* Lock the hashtable */ | |
1607 | exp_writelock(); | |
1608 | ||
1609 | dom = auth_domain_find(ncp->cl_ident); | |
1610 | /* just make sure that no addresses work | |
1611 | * and that it will expire soon | |
1612 | */ | |
1613 | if (dom) { | |
1614 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1615 | auth_domain_put(dom); |
1616 | } | |
1617 | ||
1618 | exp_writeunlock(); | |
1619 | out: | |
1620 | return err; | |
1621 | } | |
1622 | ||
1623 | /* | |
1624 | * Verify that string is non-empty and does not exceed max length. | |
1625 | */ | |
1626 | static int | |
1627 | exp_verify_string(char *cp, int max) | |
1628 | { | |
1629 | int i; | |
1630 | ||
1631 | for (i = 0; i < max; i++) | |
1632 | if (!cp[i]) | |
1633 | return i; | |
1634 | cp[i] = 0; | |
1635 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1636 | return 0; | |
1637 | } | |
1638 | ||
1639 | /* | |
1640 | * Initialize the exports module. | |
1641 | */ | |
1642 | void | |
1643 | nfsd_export_init(void) | |
1644 | { | |
1645 | dprintk("nfsd: initializing export module.\n"); | |
1646 | ||
1647 | cache_register(&svc_export_cache); | |
1648 | cache_register(&svc_expkey_cache); | |
1649 | ||
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * Flush exports table - called when last nfsd thread is killed | |
1654 | */ | |
1655 | void | |
1656 | nfsd_export_flush(void) | |
1657 | { | |
1658 | exp_writelock(); | |
1659 | cache_purge(&svc_expkey_cache); | |
1660 | cache_purge(&svc_export_cache); | |
1661 | exp_writeunlock(); | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Shutdown the exports module. | |
1666 | */ | |
1667 | void | |
1668 | nfsd_export_shutdown(void) | |
1669 | { | |
1670 | ||
1671 | dprintk("nfsd: shutting down export module.\n"); | |
1672 | ||
1673 | exp_writelock(); | |
1674 | ||
1675 | if (cache_unregister(&svc_expkey_cache)) | |
1676 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1677 | if (cache_unregister(&svc_export_cache)) | |
1678 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1679 | svcauth_unix_purge(); | |
1680 | ||
1681 | exp_writeunlock(); | |
1682 | dprintk("nfsd: export shutdown complete.\n"); | |
1683 | } |