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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 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> |
b3853e0e | 19 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 20 | |
9a74af21 | 21 | #include "nfsd.h" |
1557aca7 | 22 | #include "nfsfh.h" |
b3853e0e | 23 | #include "netns.h" |
9cf514cc | 24 | #include "pnfs.h" |
65294c1f | 25 | #include "filecache.h" |
cf749f3c | 26 | #include "trace.h" |
9a74af21 | 27 | |
1da177e4 | 28 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 | 29 | |
1da177e4 LT |
30 | /* |
31 | * We have two caches. | |
32 | * One maps client+vfsmnt+dentry to export options - the export map | |
33 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
34 | * | |
35 | * The export options are actually stored in the first map, and the | |
36 | * second map contains a reference to the entry in the first map. | |
37 | */ | |
38 | ||
39 | #define EXPKEY_HASHBITS 8 | |
40 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
41 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
1da177e4 | 42 | |
74cae61a | 43 | static void expkey_put(struct kref *ref) |
1da177e4 | 44 | { |
baab935f N |
45 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
46 | ||
47 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
48 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
49 | path_put(&key->ek_path); | |
baab935f | 50 | auth_domain_put(key->ek_client); |
9ceddd9d | 51 | kfree_rcu(key, ek_rcu); |
1da177e4 LT |
52 | } |
53 | ||
65286b88 TM |
54 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
55 | { | |
56 | return sunrpc_cache_pipe_upcall(cd, h); | |
57 | } | |
58 | ||
1da177e4 LT |
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 | ||
c89172e3 SK |
74 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
75 | struct svc_expkey *old); | |
76 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 77 | |
1da177e4 LT |
78 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
79 | { | |
f0db79d5 | 80 | /* client fsidtype fsid expiry [path] */ |
1da177e4 LT |
81 | char *buf; |
82 | int len; | |
83 | struct auth_domain *dom = NULL; | |
84 | int err; | |
85 | int fsidtype; | |
86 | char *ep; | |
87 | struct svc_expkey key; | |
30bc4dfd | 88 | struct svc_expkey *ek = NULL; |
1da177e4 | 89 | |
3476964d | 90 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
91 | return -EINVAL; |
92 | mesg[mlen-1] = 0; | |
93 | ||
94 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
95 | err = -ENOMEM; | |
30bc4dfd BF |
96 | if (!buf) |
97 | goto out; | |
1da177e4 LT |
98 | |
99 | err = -EINVAL; | |
100 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
101 | goto out; | |
102 | ||
103 | err = -ENOENT; | |
104 | dom = auth_domain_find(buf); | |
105 | if (!dom) | |
106 | goto out; | |
107 | dprintk("found domain %s\n", buf); | |
108 | ||
109 | err = -EINVAL; | |
110 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
111 | goto out; | |
112 | fsidtype = simple_strtoul(buf, &ep, 10); | |
113 | if (*ep) | |
114 | goto out; | |
115 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 116 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
117 | goto out; |
118 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
119 | goto out; | |
120 | dprintk("found fsid length %d\n", len); | |
121 | if (len != key_len(fsidtype)) | |
122 | goto out; | |
123 | ||
124 | /* OK, we seem to have a valid key */ | |
125 | key.h.flags = 0; | |
126 | key.h.expiry_time = get_expiry(&mesg); | |
127 | if (key.h.expiry_time == 0) | |
128 | goto out; | |
129 | ||
130 | key.ek_client = dom; | |
131 | key.ek_fsidtype = fsidtype; | |
132 | memcpy(key.ek_fsid, buf, len); | |
133 | ||
c89172e3 | 134 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
135 | err = -ENOMEM; |
136 | if (!ek) | |
137 | goto out; | |
138 | ||
1da177e4 | 139 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 140 | err = -EINVAL; |
30bc4dfd BF |
141 | len = qword_get(&mesg, buf, PAGE_SIZE); |
142 | if (len < 0) | |
1da177e4 LT |
143 | goto out; |
144 | dprintk("Path seems to be <%s>\n", buf); | |
145 | err = 0; | |
146 | if (len == 0) { | |
1da177e4 | 147 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 148 | ek = svc_expkey_update(cd, &key, ek); |
6a30e47f TM |
149 | if (ek) |
150 | trace_nfsd_expkey_update(ek, NULL); | |
151 | else | |
30bc4dfd | 152 | err = -ENOMEM; |
1da177e4 | 153 | } else { |
a63bb996 | 154 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 155 | if (err) |
1da177e4 LT |
156 | goto out; |
157 | ||
158 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 159 | |
c89172e3 | 160 | ek = svc_expkey_update(cd, &key, ek); |
6a30e47f TM |
161 | if (ek) |
162 | trace_nfsd_expkey_update(ek, buf); | |
163 | else | |
8d270f7f | 164 | err = -ENOMEM; |
a63bb996 | 165 | path_put(&key.ek_path); |
1da177e4 LT |
166 | } |
167 | cache_flush(); | |
168 | out: | |
30bc4dfd | 169 | if (ek) |
d4bb527e | 170 | cache_put(&ek->h, cd); |
1da177e4 LT |
171 | if (dom) |
172 | auth_domain_put(dom); | |
f99d49ad | 173 | kfree(buf); |
1da177e4 LT |
174 | return err; |
175 | } | |
176 | ||
177 | static int expkey_show(struct seq_file *m, | |
178 | struct cache_detail *cd, | |
179 | struct cache_head *h) | |
180 | { | |
181 | struct svc_expkey *ek ; | |
af6a4e28 | 182 | int i; |
1da177e4 LT |
183 | |
184 | if (h ==NULL) { | |
185 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
186 | return 0; | |
187 | } | |
188 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
189 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
190 | ek->ek_fsidtype); | |
191 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
192 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
193 | if (test_bit(CACHE_VALID, &h->flags) && |
194 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
195 | seq_printf(m, " "); | |
c32c2f63 | 196 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
197 | } |
198 | seq_printf(m, "\n"); | |
199 | return 0; | |
200 | } | |
1da177e4 | 201 | |
8d270f7f | 202 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 203 | { |
8d270f7f N |
204 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
205 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
206 | ||
207 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
208 | orig->ek_client != new->ek_client || | |
209 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
210 | return 0; |
211 | return 1; | |
212 | } | |
213 | ||
8d270f7f N |
214 | static inline void expkey_init(struct cache_head *cnew, |
215 | struct cache_head *citem) | |
1da177e4 | 216 | { |
8d270f7f N |
217 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
218 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
219 | ||
efc36aa5 | 220 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
221 | new->ek_client = item->ek_client; |
222 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
223 | |
224 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
225 | } |
226 | ||
8d270f7f N |
227 | static inline void expkey_update(struct cache_head *cnew, |
228 | struct cache_head *citem) | |
1da177e4 | 229 | { |
8d270f7f N |
230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
232 | ||
e83aece3 JB |
233 | new->ek_path = item->ek_path; |
234 | path_get(&item->ek_path); | |
1da177e4 LT |
235 | } |
236 | ||
8d270f7f N |
237 | static struct cache_head *expkey_alloc(void) |
238 | { | |
239 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
240 | if (i) | |
241 | return &i->h; | |
242 | else | |
243 | return NULL; | |
244 | } | |
245 | ||
65294c1f JL |
246 | static void expkey_flush(void) |
247 | { | |
248 | /* | |
249 | * Take the nfsd_mutex here to ensure that the file cache is not | |
250 | * destroyed while we're in the middle of flushing. | |
251 | */ | |
252 | mutex_lock(&nfsd_mutex); | |
5e113224 | 253 | nfsd_file_cache_purge(current->nsproxy->net_ns); |
65294c1f JL |
254 | mutex_unlock(&nfsd_mutex); |
255 | } | |
256 | ||
ae2e408e | 257 | static const struct cache_detail svc_expkey_cache_template = { |
8d270f7f N |
258 | .owner = THIS_MODULE, |
259 | .hash_size = EXPKEY_HASHMAX, | |
8d270f7f N |
260 | .name = "nfsd.fh", |
261 | .cache_put = expkey_put, | |
65286b88 | 262 | .cache_upcall = expkey_upcall, |
73fb847a | 263 | .cache_request = expkey_request, |
8d270f7f N |
264 | .cache_parse = expkey_parse, |
265 | .cache_show = expkey_show, | |
266 | .match = expkey_match, | |
267 | .init = expkey_init, | |
268 | .update = expkey_update, | |
269 | .alloc = expkey_alloc, | |
65294c1f | 270 | .flush = expkey_flush, |
8d270f7f N |
271 | }; |
272 | ||
61f8603d N |
273 | static int |
274 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 275 | { |
8d270f7f N |
276 | int hash = item->ek_fsidtype; |
277 | char * cp = (char*)item->ek_fsid; | |
278 | int len = key_len(item->ek_fsidtype); | |
279 | ||
280 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
281 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
282 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
283 | return hash; |
284 | } | |
285 | ||
286 | static struct svc_expkey * | |
c89172e3 | 287 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
61f8603d N |
288 | { |
289 | struct cache_head *ch; | |
290 | int hash = svc_expkey_hash(item); | |
8d270f7f | 291 | |
9ceddd9d | 292 | ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash); |
8d270f7f N |
293 | if (ch) |
294 | return container_of(ch, struct svc_expkey, h); | |
295 | else | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | static struct svc_expkey * | |
c89172e3 SK |
300 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
301 | struct svc_expkey *old) | |
8d270f7f N |
302 | { |
303 | struct cache_head *ch; | |
61f8603d | 304 | int hash = svc_expkey_hash(new); |
8d270f7f | 305 | |
c89172e3 | 306 | ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
8d270f7f N |
307 | if (ch) |
308 | return container_of(ch, struct svc_expkey, h); | |
309 | else | |
310 | return NULL; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | |
314 | #define EXPORT_HASHBITS 8 | |
315 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
1da177e4 | 316 | |
93346919 MN |
317 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
318 | { | |
a1f05514 | 319 | struct nfsd4_fs_location *locations = fsloc->locations; |
93346919 MN |
320 | int i; |
321 | ||
a1f05514 KM |
322 | if (!locations) |
323 | return; | |
324 | ||
93346919 | 325 | for (i = 0; i < fsloc->locations_count; i++) { |
a1f05514 KM |
326 | kfree(locations[i].path); |
327 | kfree(locations[i].hosts); | |
93346919 | 328 | } |
a1f05514 KM |
329 | |
330 | kfree(locations); | |
331 | fsloc->locations = NULL; | |
93346919 MN |
332 | } |
333 | ||
baab935f | 334 | static void svc_export_put(struct kref *ref) |
1da177e4 | 335 | { |
baab935f | 336 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 337 | path_put(&exp->ex_path); |
baab935f | 338 | auth_domain_put(exp->ex_client); |
93346919 | 339 | nfsd4_fslocs_free(&exp->ex_fslocs); |
885c91f7 | 340 | kfree(exp->ex_uuid); |
9ceddd9d | 341 | kfree_rcu(exp, ex_rcu); |
1da177e4 LT |
342 | } |
343 | ||
65286b88 TM |
344 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
345 | { | |
346 | return sunrpc_cache_pipe_upcall(cd, h); | |
347 | } | |
348 | ||
1da177e4 LT |
349 | static void svc_export_request(struct cache_detail *cd, |
350 | struct cache_head *h, | |
351 | char **bpp, int *blen) | |
352 | { | |
353 | /* client path */ | |
354 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
355 | char *pth; | |
356 | ||
357 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 358 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
359 | if (IS_ERR(pth)) { |
360 | /* is this correct? */ | |
361 | (*bpp)[0] = '\n'; | |
362 | return; | |
363 | } | |
364 | qword_add(bpp, blen, pth); | |
365 | (*bpp)[-1] = '\n'; | |
366 | } | |
367 | ||
74cae61a AB |
368 | static struct svc_export *svc_export_update(struct svc_export *new, |
369 | struct svc_export *old); | |
4f7774c3 | 370 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 371 | |
774b1478 | 372 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
373 | { |
374 | ||
f2ca7153 BF |
375 | /* |
376 | * We currently export only dirs, regular files, and (for v4 | |
377 | * pseudoroot) symlinks. | |
1da177e4 LT |
378 | */ |
379 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 380 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
381 | !S_ISREG(inode->i_mode)) |
382 | return -ENOTDIR; | |
383 | ||
774b1478 BF |
384 | /* |
385 | * Mountd should never pass down a writeable V4ROOT export, but, | |
386 | * just to make sure: | |
387 | */ | |
388 | if (*flags & NFSEXP_V4ROOT) | |
389 | *flags |= NFSEXP_READONLY; | |
390 | ||
1da177e4 LT |
391 | /* There are two requirements on a filesystem to be exportable. |
392 | * 1: We must be able to identify the filesystem from a number. | |
393 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 394 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
395 | * 2: We must be able to find an inode from a filehandle. |
396 | * This means that s_export_op must be set. | |
397 | */ | |
398 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 399 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 400 | uuid == NULL) { |
3e3b4800 | 401 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
402 | return -EINVAL; |
403 | } | |
cfaea787 CH |
404 | |
405 | if (!inode->i_sb->s_export_op || | |
406 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
407 | dprintk("exp_export: export of invalid fs type.\n"); |
408 | return -EINVAL; | |
409 | } | |
410 | ||
1da177e4 LT |
411 | return 0; |
412 | ||
413 | } | |
414 | ||
93346919 MN |
415 | #ifdef CONFIG_NFSD_V4 |
416 | ||
417 | static int | |
418 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
419 | { | |
420 | int len; | |
421 | int migrated, i, err; | |
422 | ||
be69da80 KM |
423 | /* more than one fsloc */ |
424 | if (fsloc->locations) | |
425 | return -EINVAL; | |
426 | ||
93346919 | 427 | /* listsize */ |
a007c4c3 | 428 | err = get_uint(mesg, &fsloc->locations_count); |
93346919 MN |
429 | if (err) |
430 | return err; | |
431 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
432 | return -EINVAL; | |
433 | if (fsloc->locations_count == 0) | |
434 | return 0; | |
435 | ||
6396bb22 KC |
436 | fsloc->locations = kcalloc(fsloc->locations_count, |
437 | sizeof(struct nfsd4_fs_location), | |
438 | GFP_KERNEL); | |
93346919 MN |
439 | if (!fsloc->locations) |
440 | return -ENOMEM; | |
441 | for (i=0; i < fsloc->locations_count; i++) { | |
442 | /* colon separated host list */ | |
443 | err = -EINVAL; | |
444 | len = qword_get(mesg, buf, PAGE_SIZE); | |
445 | if (len <= 0) | |
446 | goto out_free_all; | |
447 | err = -ENOMEM; | |
448 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
449 | if (!fsloc->locations[i].hosts) | |
450 | goto out_free_all; | |
451 | err = -EINVAL; | |
452 | /* slash separated path component list */ | |
453 | len = qword_get(mesg, buf, PAGE_SIZE); | |
454 | if (len <= 0) | |
455 | goto out_free_all; | |
456 | err = -ENOMEM; | |
457 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
458 | if (!fsloc->locations[i].path) | |
459 | goto out_free_all; | |
460 | } | |
461 | /* migrated */ | |
462 | err = get_int(mesg, &migrated); | |
463 | if (err) | |
464 | goto out_free_all; | |
465 | err = -EINVAL; | |
466 | if (migrated < 0 || migrated > 1) | |
467 | goto out_free_all; | |
468 | fsloc->migrated = migrated; | |
469 | return 0; | |
470 | out_free_all: | |
471 | nfsd4_fslocs_free(fsloc); | |
472 | return err; | |
473 | } | |
474 | ||
e677bfe4 AA |
475 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
476 | { | |
e677bfe4 | 477 | struct exp_flavor_info *f; |
1f53146d KM |
478 | u32 listsize; |
479 | int err; | |
e677bfe4 | 480 | |
be69da80 KM |
481 | /* more than one secinfo */ |
482 | if (exp->ex_nflavors) | |
483 | return -EINVAL; | |
484 | ||
1f53146d | 485 | err = get_uint(mesg, &listsize); |
e677bfe4 AA |
486 | if (err) |
487 | return err; | |
1f53146d | 488 | if (listsize > MAX_SECINFO_LIST) |
e677bfe4 AA |
489 | return -EINVAL; |
490 | ||
491 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
a007c4c3 | 492 | err = get_uint(mesg, &f->pseudoflavor); |
e677bfe4 AA |
493 | if (err) |
494 | return err; | |
495 | /* | |
80492e7d RK |
496 | * XXX: It would be nice to also check whether this |
497 | * pseudoflavor is supported, so we can discover the | |
498 | * problem at export time instead of when a client fails | |
499 | * to authenticate. | |
e677bfe4 | 500 | */ |
a007c4c3 | 501 | err = get_uint(mesg, &f->flags); |
e677bfe4 AA |
502 | if (err) |
503 | return err; | |
504 | /* Only some flags are allowed to differ between flavors: */ | |
505 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
506 | return -EINVAL; | |
507 | } | |
508 | exp->ex_nflavors = listsize; | |
509 | return 0; | |
510 | } | |
511 | ||
93346919 | 512 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
513 | static inline int |
514 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
515 | static inline int | |
516 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
517 | #endif |
518 | ||
0d63790c | 519 | static inline int |
12ce5f8c | 520 | nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid) |
0d63790c KM |
521 | { |
522 | int len; | |
523 | ||
be69da80 KM |
524 | /* more than one uuid */ |
525 | if (*puuid) | |
526 | return -EINVAL; | |
527 | ||
0d63790c KM |
528 | /* expect a 16 byte uuid encoded as \xXXXX... */ |
529 | len = qword_get(mesg, buf, PAGE_SIZE); | |
94eb3689 | 530 | if (len != EX_UUID_LEN) |
0d63790c KM |
531 | return -EINVAL; |
532 | ||
94eb3689 | 533 | *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL); |
0d63790c KM |
534 | if (*puuid == NULL) |
535 | return -ENOMEM; | |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
1da177e4 LT |
540 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
541 | { | |
542 | /* client path expiry [flags anonuid anongid fsid] */ | |
543 | char *buf; | |
544 | int len; | |
545 | int err; | |
546 | struct auth_domain *dom = NULL; | |
c1a2a475 | 547 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
548 | int an_int; |
549 | ||
1da177e4 LT |
550 | if (mesg[mlen-1] != '\n') |
551 | return -EINVAL; | |
552 | mesg[mlen-1] = 0; | |
553 | ||
554 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
555 | if (!buf) |
556 | return -ENOMEM; | |
1da177e4 LT |
557 | |
558 | /* client */ | |
1da177e4 | 559 | err = -EINVAL; |
c1a2a475 AV |
560 | len = qword_get(&mesg, buf, PAGE_SIZE); |
561 | if (len <= 0) | |
562 | goto out; | |
1da177e4 LT |
563 | |
564 | err = -ENOENT; | |
565 | dom = auth_domain_find(buf); | |
566 | if (!dom) | |
567 | goto out; | |
568 | ||
569 | /* path */ | |
570 | err = -EINVAL; | |
c1a2a475 AV |
571 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
572 | goto out1; | |
573 | ||
574 | err = kern_path(buf, 0, &exp.ex_path); | |
575 | if (err) | |
576 | goto out1; | |
1da177e4 | 577 | |
1da177e4 | 578 | exp.ex_client = dom; |
db3a3532 | 579 | exp.cd = cd; |
9cf514cc | 580 | exp.ex_devid_map = NULL; |
c1a2a475 | 581 | |
1da177e4 LT |
582 | /* expiry */ |
583 | err = -EINVAL; | |
584 | exp.h.expiry_time = get_expiry(&mesg); | |
585 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 586 | goto out3; |
1da177e4 LT |
587 | |
588 | /* flags */ | |
589 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
590 | if (err == -ENOENT) { |
591 | err = 0; | |
1da177e4 | 592 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 593 | } else { |
c1a2a475 AV |
594 | if (err || an_int < 0) |
595 | goto out3; | |
1da177e4 LT |
596 | exp.ex_flags= an_int; |
597 | ||
598 | /* anon uid */ | |
599 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
600 | if (err) |
601 | goto out3; | |
e45d1a18 | 602 | exp.ex_anon_uid= make_kuid(current_user_ns(), an_int); |
1da177e4 LT |
603 | |
604 | /* anon gid */ | |
605 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
606 | if (err) |
607 | goto out3; | |
e45d1a18 | 608 | exp.ex_anon_gid= make_kgid(current_user_ns(), an_int); |
1da177e4 LT |
609 | |
610 | /* fsid */ | |
611 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
612 | if (err) |
613 | goto out3; | |
1da177e4 LT |
614 | exp.ex_fsid = an_int; |
615 | ||
af6a4e28 N |
616 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
617 | if (strcmp(buf, "fsloc") == 0) | |
618 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
0d63790c | 619 | else if (strcmp(buf, "uuid") == 0) |
12ce5f8c | 620 | err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid); |
0d63790c | 621 | else if (strcmp(buf, "secinfo") == 0) |
e677bfe4 AA |
622 | err = secinfo_parse(&mesg, buf, &exp); |
623 | else | |
af6a4e28 N |
624 | /* quietly ignore unknown words and anything |
625 | * following. Newer user-space can try to set | |
626 | * new values, then see what the result was. | |
627 | */ | |
628 | break; | |
629 | if (err) | |
c1a2a475 | 630 | goto out4; |
af6a4e28 | 631 | } |
93346919 | 632 | |
2b0143b5 | 633 | err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags, |
af6a4e28 | 634 | exp.ex_uuid); |
c1a2a475 AV |
635 | if (err) |
636 | goto out4; | |
6f6cc320 BF |
637 | /* |
638 | * No point caching this if it would immediately expire. | |
639 | * Also, this protects exportfs's dummy export from the | |
640 | * anon_uid/anon_gid checks: | |
641 | */ | |
642 | if (exp.h.expiry_time < seconds_since_boot()) | |
643 | goto out4; | |
427d6c66 BF |
644 | /* |
645 | * For some reason exportfs has been passing down an | |
646 | * invalid (-1) uid & gid on the "dummy" export which it | |
647 | * uses to test export support. To make sure exportfs | |
648 | * sees errors from check_export we therefore need to | |
649 | * delay these checks till after check_export: | |
650 | */ | |
6f6cc320 | 651 | err = -EINVAL; |
427d6c66 BF |
652 | if (!uid_valid(exp.ex_anon_uid)) |
653 | goto out4; | |
654 | if (!gid_valid(exp.ex_anon_gid)) | |
655 | goto out4; | |
6f6cc320 | 656 | err = 0; |
9cf514cc CH |
657 | |
658 | nfsd4_setup_layout_type(&exp); | |
1da177e4 LT |
659 | } |
660 | ||
4f7774c3 | 661 | expp = svc_export_lookup(&exp); |
6a30e47f | 662 | if (!expp) { |
4f7774c3 | 663 | err = -ENOMEM; |
6a30e47f TM |
664 | goto out4; |
665 | } | |
666 | expp = svc_export_update(&exp, expp); | |
667 | if (expp) { | |
668 | trace_nfsd_export_update(expp); | |
669 | cache_flush(); | |
4f7774c3 | 670 | exp_put(expp); |
6a30e47f TM |
671 | } else |
672 | err = -ENOMEM; | |
c1a2a475 | 673 | out4: |
af6a4e28 N |
674 | nfsd4_fslocs_free(&exp.ex_fslocs); |
675 | kfree(exp.ex_uuid); | |
c1a2a475 | 676 | out3: |
c1a2a475 AV |
677 | path_put(&exp.ex_path); |
678 | out1: | |
679 | auth_domain_put(dom); | |
680 | out: | |
f99d49ad | 681 | kfree(buf); |
1da177e4 LT |
682 | return err; |
683 | } | |
684 | ||
93346919 | 685 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 686 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
91fe39d3 | 687 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
688 | |
689 | static int svc_export_show(struct seq_file *m, | |
690 | struct cache_detail *cd, | |
691 | struct cache_head *h) | |
692 | { | |
693 | struct svc_export *exp ; | |
694 | ||
695 | if (h ==NULL) { | |
696 | seq_puts(m, "#path domain(flags)\n"); | |
697 | return 0; | |
698 | } | |
699 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 700 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
701 | seq_putc(m, '\t'); |
702 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
703 | seq_putc(m, '('); | |
704 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 705 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
706 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
707 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
708 | if (exp->ex_uuid) { |
709 | int i; | |
710 | seq_puts(m, ",uuid="); | |
94eb3689 | 711 | for (i = 0; i < EX_UUID_LEN; i++) { |
af6a4e28 N |
712 | if ((i&3) == 0 && i) |
713 | seq_putc(m, ':'); | |
714 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
715 | } | |
716 | } | |
91fe39d3 | 717 | show_secinfo(m, exp); |
af6a4e28 | 718 | } |
1da177e4 LT |
719 | seq_puts(m, ")\n"); |
720 | return 0; | |
721 | } | |
4f7774c3 | 722 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 723 | { |
4f7774c3 N |
724 | struct svc_export *orig = container_of(a, struct svc_export, h); |
725 | struct svc_export *new = container_of(b, struct svc_export, h); | |
726 | return orig->ex_client == new->ex_client && | |
b77a4b2e | 727 | path_equal(&orig->ex_path, &new->ex_path); |
1da177e4 | 728 | } |
4f7774c3 N |
729 | |
730 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 731 | { |
4f7774c3 N |
732 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
733 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
734 | ||
efc36aa5 | 735 | kref_get(&item->ex_client->ref); |
1da177e4 | 736 | new->ex_client = item->ex_client; |
0da22a91 KM |
737 | new->ex_path = item->ex_path; |
738 | path_get(&item->ex_path); | |
93346919 MN |
739 | new->ex_fslocs.locations = NULL; |
740 | new->ex_fslocs.locations_count = 0; | |
741 | new->ex_fslocs.migrated = 0; | |
8a4c3926 | 742 | new->ex_layout_types = 0; |
2eeb9b2a | 743 | new->ex_uuid = NULL; |
db3a3532 | 744 | new->cd = item->cd; |
1da177e4 LT |
745 | } |
746 | ||
4f7774c3 | 747 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 748 | { |
4f7774c3 N |
749 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
750 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 751 | int i; |
4f7774c3 | 752 | |
1da177e4 LT |
753 | new->ex_flags = item->ex_flags; |
754 | new->ex_anon_uid = item->ex_anon_uid; | |
755 | new->ex_anon_gid = item->ex_anon_gid; | |
756 | new->ex_fsid = item->ex_fsid; | |
9cf514cc CH |
757 | new->ex_devid_map = item->ex_devid_map; |
758 | item->ex_devid_map = NULL; | |
af6a4e28 N |
759 | new->ex_uuid = item->ex_uuid; |
760 | item->ex_uuid = NULL; | |
93346919 MN |
761 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
762 | item->ex_fslocs.locations = NULL; | |
763 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
764 | item->ex_fslocs.locations_count = 0; | |
765 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
766 | item->ex_fslocs.migrated = 0; | |
8a4c3926 | 767 | new->ex_layout_types = item->ex_layout_types; |
e677bfe4 AA |
768 | new->ex_nflavors = item->ex_nflavors; |
769 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
770 | new->ex_flavors[i] = item->ex_flavors[i]; | |
771 | } | |
1da177e4 LT |
772 | } |
773 | ||
4f7774c3 N |
774 | static struct cache_head *svc_export_alloc(void) |
775 | { | |
776 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
777 | if (i) | |
778 | return &i->h; | |
779 | else | |
780 | return NULL; | |
781 | } | |
782 | ||
ae2e408e | 783 | static const struct cache_detail svc_export_cache_template = { |
4f7774c3 N |
784 | .owner = THIS_MODULE, |
785 | .hash_size = EXPORT_HASHMAX, | |
4f7774c3 N |
786 | .name = "nfsd.export", |
787 | .cache_put = svc_export_put, | |
65286b88 | 788 | .cache_upcall = svc_export_upcall, |
73fb847a | 789 | .cache_request = svc_export_request, |
4f7774c3 N |
790 | .cache_parse = svc_export_parse, |
791 | .cache_show = svc_export_show, | |
792 | .match = svc_export_match, | |
793 | .init = svc_export_init, | |
794 | .update = export_update, | |
795 | .alloc = svc_export_alloc, | |
796 | }; | |
797 | ||
61f8603d N |
798 | static int |
799 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 800 | { |
4f7774c3 | 801 | int hash; |
61f8603d | 802 | |
4f7774c3 | 803 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
804 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
805 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
806 | return hash; |
807 | } | |
808 | ||
809 | static struct svc_export * | |
810 | svc_export_lookup(struct svc_export *exp) | |
811 | { | |
812 | struct cache_head *ch; | |
813 | int hash = svc_export_hash(exp); | |
4f7774c3 | 814 | |
9ceddd9d | 815 | ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash); |
4f7774c3 N |
816 | if (ch) |
817 | return container_of(ch, struct svc_export, h); | |
818 | else | |
819 | return NULL; | |
820 | } | |
821 | ||
74cae61a | 822 | static struct svc_export * |
4f7774c3 N |
823 | svc_export_update(struct svc_export *new, struct svc_export *old) |
824 | { | |
825 | struct cache_head *ch; | |
61f8603d | 826 | int hash = svc_export_hash(old); |
4f7774c3 | 827 | |
db3a3532 | 828 | ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
4f7774c3 N |
829 | if (ch) |
830 | return container_of(ch, struct svc_export, h); | |
831 | else | |
832 | return NULL; | |
833 | } | |
1da177e4 LT |
834 | |
835 | ||
74cae61a | 836 | static struct svc_expkey * |
e6d615f7 | 837 | exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type, |
c89172e3 | 838 | u32 *fsidv, struct cache_req *reqp) |
1da177e4 LT |
839 | { |
840 | struct svc_expkey key, *ek; | |
841 | int err; | |
842 | ||
843 | if (!clp) | |
2d3bb252 | 844 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
845 | |
846 | key.ek_client = clp; | |
847 | key.ek_fsidtype = fsid_type; | |
848 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
849 | ||
c89172e3 | 850 | ek = svc_expkey_lookup(cd, &key); |
2d3bb252 BF |
851 | if (ek == NULL) |
852 | return ERR_PTR(-ENOMEM); | |
c89172e3 | 853 | err = cache_check(cd, &ek->h, reqp); |
cf749f3c TM |
854 | if (err) { |
855 | trace_nfsd_exp_find_key(&key, err); | |
2d3bb252 | 856 | return ERR_PTR(err); |
cf749f3c | 857 | } |
1da177e4 LT |
858 | return ek; |
859 | } | |
860 | ||
e6d615f7 KM |
861 | static struct svc_export * |
862 | exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp, | |
863 | const struct path *path, struct cache_req *reqp) | |
1da177e4 LT |
864 | { |
865 | struct svc_export *exp, key; | |
2d3bb252 | 866 | int err; |
e83aece3 | 867 | |
1da177e4 | 868 | if (!clp) |
2d3bb252 | 869 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
870 | |
871 | key.ex_client = clp; | |
55430e2e | 872 | key.ex_path = *path; |
2a75cfa6 | 873 | key.cd = cd; |
1da177e4 | 874 | |
4f7774c3 | 875 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
876 | if (exp == NULL) |
877 | return ERR_PTR(-ENOMEM); | |
2a75cfa6 | 878 | err = cache_check(cd, &exp->h, reqp); |
cf749f3c TM |
879 | if (err) { |
880 | trace_nfsd_exp_get_by_name(&key, err); | |
2d3bb252 | 881 | return ERR_PTR(err); |
cf749f3c | 882 | } |
1da177e4 LT |
883 | return exp; |
884 | } | |
885 | ||
886 | /* | |
887 | * Find the export entry for a given dentry. | |
888 | */ | |
e6d615f7 KM |
889 | static struct svc_export * |
890 | exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path) | |
1da177e4 | 891 | { |
5bf3bd2b | 892 | struct dentry *saved = dget(path->dentry); |
e6d615f7 | 893 | struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
5bf3bd2b AV |
894 | |
895 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
896 | struct dentry *parent = dget_parent(path->dentry); | |
897 | dput(path->dentry); | |
898 | path->dentry = parent; | |
2a75cfa6 | 899 | exp = exp_get_by_name(cd, clp, path, NULL); |
1da177e4 | 900 | } |
5bf3bd2b AV |
901 | dput(path->dentry); |
902 | path->dentry = saved; | |
1da177e4 LT |
903 | return exp; |
904 | } | |
905 | ||
1da177e4 | 906 | |
1da177e4 LT |
907 | |
908 | /* | |
909 | * Obtain the root fh on behalf of a client. | |
910 | * This could be done in user space, but I feel that it adds some safety | |
911 | * since its harder to fool a kernel module than a user space program. | |
912 | */ | |
913 | int | |
e6d615f7 | 914 | exp_rootfh(struct net *net, struct auth_domain *clp, char *name, |
2a75cfa6 | 915 | struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
916 | { |
917 | struct svc_export *exp; | |
a63bb996 | 918 | struct path path; |
1da177e4 LT |
919 | struct inode *inode; |
920 | struct svc_fh fh; | |
921 | int err; | |
b3853e0e SK |
922 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
923 | struct cache_detail *cd = nn->svc_export_cache; | |
1da177e4 LT |
924 | |
925 | err = -EPERM; | |
926 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
927 | if (kern_path(name, 0, &path)) { |
928 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
929 | return err; |
930 | } | |
2b0143b5 | 931 | inode = d_inode(path.dentry); |
1da177e4 LT |
932 | |
933 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 934 | name, path.dentry, clp->name, |
1da177e4 | 935 | inode->i_sb->s_id, inode->i_ino); |
2a75cfa6 | 936 | exp = exp_parent(cd, clp, &path); |
4b41bd85 BF |
937 | if (IS_ERR(exp)) { |
938 | err = PTR_ERR(exp); | |
939 | goto out; | |
940 | } | |
1da177e4 LT |
941 | |
942 | /* | |
943 | * fh must be initialized before calling fh_compose | |
944 | */ | |
945 | fh_init(&fh, maxsize); | |
a63bb996 | 946 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
947 | err = -EINVAL; |
948 | else | |
949 | err = 0; | |
950 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
951 | fh_put(&fh); | |
952 | exp_put(exp); | |
953 | out: | |
a63bb996 | 954 | path_put(&path); |
1da177e4 LT |
955 | return err; |
956 | } | |
957 | ||
2a75cfa6 SK |
958 | static struct svc_export *exp_find(struct cache_detail *cd, |
959 | struct auth_domain *clp, int fsid_type, | |
cce76f9b | 960 | u32 *fsidv, struct cache_req *reqp) |
eab7e2e6 N |
961 | { |
962 | struct svc_export *exp; | |
e5f06f72 SK |
963 | struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
964 | struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 965 | if (IS_ERR(ek)) |
e231c2ee | 966 | return ERR_CAST(ek); |
eab7e2e6 | 967 | |
2a75cfa6 | 968 | exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
e5f06f72 | 969 | cache_put(&ek->h, nn->svc_expkey_cache); |
eab7e2e6 | 970 | |
2d3bb252 | 971 | if (IS_ERR(exp)) |
e231c2ee | 972 | return ERR_CAST(exp); |
eab7e2e6 N |
973 | return exp; |
974 | } | |
975 | ||
32c1eb0c AA |
976 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
977 | { | |
978 | struct exp_flavor_info *f; | |
979 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
980 | ||
981 | /* legacy gss-only clients are always OK: */ | |
982 | if (exp->ex_client == rqstp->rq_gssclient) | |
983 | return 0; | |
984 | /* ip-address based client; check sec= export option: */ | |
985 | for (f = exp->ex_flavors; f < end; f++) { | |
d5497fc6 | 986 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
32c1eb0c AA |
987 | return 0; |
988 | } | |
989 | /* defaults in absence of sec= options: */ | |
990 | if (exp->ex_nflavors == 0) { | |
d5497fc6 BF |
991 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
992 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) | |
32c1eb0c AA |
993 | return 0; |
994 | } | |
ed941643 AE |
995 | |
996 | /* If the compound op contains a spo_must_allowed op, | |
997 | * it will be sent with integrity/protection which | |
998 | * will have to be expressly allowed on mounts that | |
999 | * don't support it | |
1000 | */ | |
1001 | ||
1002 | if (nfsd4_spo_must_allow(rqstp)) | |
1003 | return 0; | |
1004 | ||
32c1eb0c AA |
1005 | return nfserr_wrongsec; |
1006 | } | |
1007 | ||
0989a788 | 1008 | /* |
2ea2209f BF |
1009 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1010 | * auth_unix client) if it's available and has secinfo information; | |
1011 | * otherwise, will try to use rq_gssclient. | |
1012 | * | |
0989a788 BF |
1013 | * Called from functions that handle requests; functions that do work on |
1014 | * behalf of mountd are passed a single client name to use, and should | |
1015 | * use exp_get_by_name() or exp_find(). | |
1016 | */ | |
1017 | struct svc_export * | |
91c9fa8f | 1018 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1019 | { |
9a25b96c | 1020 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 1021 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 1022 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
1023 | |
1024 | if (rqstp->rq_client == NULL) | |
1025 | goto gss; | |
3ab4d8b1 | 1026 | |
2ea2209f | 1027 | /* First try the auth_unix client: */ |
2a75cfa6 | 1028 | exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
1029 | if (PTR_ERR(exp) == -ENOENT) |
1030 | goto gss; | |
1031 | if (IS_ERR(exp)) | |
1032 | return exp; | |
1033 | /* If it has secinfo, assume there are no gss/... clients */ | |
1034 | if (exp->ex_nflavors > 0) | |
1035 | return exp; | |
1036 | gss: | |
1037 | /* Otherwise, try falling back on gss client */ | |
1038 | if (rqstp->rq_gssclient == NULL) | |
1039 | return exp; | |
2a75cfa6 | 1040 | gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
1041 | if (PTR_ERR(gssexp) == -ENOENT) |
1042 | return exp; | |
9a25b96c | 1043 | if (!IS_ERR(exp)) |
2ea2209f BF |
1044 | exp_put(exp); |
1045 | return gssexp; | |
0989a788 BF |
1046 | } |
1047 | ||
1048 | struct svc_export * | |
1049 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1050 | { | |
9a25b96c | 1051 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 1052 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 1053 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
1054 | |
1055 | if (rqstp->rq_client == NULL) | |
1056 | goto gss; | |
3ab4d8b1 | 1057 | |
2ea2209f | 1058 | /* First try the auth_unix client: */ |
2a75cfa6 SK |
1059 | exp = exp_find(cd, rqstp->rq_client, fsid_type, |
1060 | fsidv, &rqstp->rq_chandle); | |
2ea2209f BF |
1061 | if (PTR_ERR(exp) == -ENOENT) |
1062 | goto gss; | |
1063 | if (IS_ERR(exp)) | |
1064 | return exp; | |
1065 | /* If it has secinfo, assume there are no gss/... clients */ | |
1066 | if (exp->ex_nflavors > 0) | |
1067 | return exp; | |
1068 | gss: | |
1069 | /* Otherwise, try falling back on gss client */ | |
1070 | if (rqstp->rq_gssclient == NULL) | |
1071 | return exp; | |
2a75cfa6 | 1072 | gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
2ea2209f BF |
1073 | &rqstp->rq_chandle); |
1074 | if (PTR_ERR(gssexp) == -ENOENT) | |
1075 | return exp; | |
9a25b96c | 1076 | if (!IS_ERR(exp)) |
2ea2209f BF |
1077 | exp_put(exp); |
1078 | return gssexp; | |
0989a788 BF |
1079 | } |
1080 | ||
1081 | struct svc_export * | |
e64c390c | 1082 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1083 | { |
e64c390c AV |
1084 | struct dentry *saved = dget(path->dentry); |
1085 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1086 | |
e64c390c AV |
1087 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1088 | struct dentry *parent = dget_parent(path->dentry); | |
1089 | dput(path->dentry); | |
1090 | path->dentry = parent; | |
1091 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1092 | } |
e64c390c AV |
1093 | dput(path->dentry); |
1094 | path->dentry = saved; | |
2ea2209f | 1095 | return exp; |
0989a788 | 1096 | } |
eab7e2e6 | 1097 | |
ed748aac | 1098 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1099 | { |
f39bde24 BF |
1100 | u32 fsidv[2]; |
1101 | ||
1102 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1103 | ||
260c64d2 | 1104 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1105 | } |
1106 | ||
1da177e4 LT |
1107 | /* |
1108 | * Called when we need the filehandle for the root of the pseudofs, | |
1109 | * for a given NFSv4 client. The root is defined to be the | |
1110 | * export point with fsid==0 | |
1111 | */ | |
c7afef1f | 1112 | __be32 |
df547efb | 1113 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1114 | { |
eab7e2e6 | 1115 | struct svc_export *exp; |
c7afef1f | 1116 | __be32 rv; |
1da177e4 | 1117 | |
ed748aac | 1118 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1119 | if (IS_ERR(exp)) |
1120 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1121 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1122 | exp_put(exp); |
1da177e4 LT |
1123 | return rv; |
1124 | } | |
1125 | ||
1da177e4 LT |
1126 | static struct flags { |
1127 | int flag; | |
1128 | char *name[2]; | |
1129 | } expflags[] = { | |
1130 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1131 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1132 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1133 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1134 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1135 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
18c01ab3 | 1136 | { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}}, |
1da177e4 LT |
1137 | { NFSEXP_NOHIDE, {"nohide", ""}}, |
1138 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1139 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1140 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1141 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
9b3075c5 | 1142 | { NFSEXP_PNFS, {"pnfs", ""}}, |
32ddd944 | 1143 | { NFSEXP_SECURITY_LABEL, {"security_label", ""}}, |
1da177e4 LT |
1144 | { 0, {"", ""}} |
1145 | }; | |
1146 | ||
ac34cdb0 | 1147 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1148 | { |
1da177e4 | 1149 | struct flags *flg; |
ac34cdb0 | 1150 | int state, first = 0; |
1da177e4 LT |
1151 | |
1152 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1153 | if (flg->flag & ~mask) |
1154 | continue; | |
1155 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1156 | if (*flg->name[state]) |
1157 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1158 | } | |
ac34cdb0 BF |
1159 | } |
1160 | ||
91fe39d3 BF |
1161 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1162 | { | |
1163 | seq_printf(m, ","); | |
1164 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1165 | } | |
1166 | ||
74ec1e12 BF |
1167 | static bool secinfo_flags_equal(int f, int g) |
1168 | { | |
1169 | f &= NFSEXP_SECINFO_FLAGS; | |
1170 | g &= NFSEXP_SECINFO_FLAGS; | |
1171 | return f == g; | |
1172 | } | |
1173 | ||
1174 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1175 | { | |
1176 | int flags; | |
1177 | ||
1178 | flags = (*fp)->flags; | |
1179 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1180 | (*fp)++; | |
1181 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1182 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1183 | (*fp)++; | |
1184 | } | |
1185 | return flags; | |
1186 | } | |
1187 | ||
91fe39d3 BF |
1188 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1189 | { | |
1190 | struct exp_flavor_info *f; | |
1191 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1192 | int flags; |
91fe39d3 BF |
1193 | |
1194 | if (exp->ex_nflavors == 0) | |
1195 | return; | |
74ec1e12 BF |
1196 | f = exp->ex_flavors; |
1197 | flags = show_secinfo_run(m, &f, end); | |
1198 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1199 | show_secinfo_flags(m, flags); | |
1200 | while (f != end) { | |
1201 | flags = show_secinfo_run(m, &f, end); | |
1202 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1203 | } |
91fe39d3 BF |
1204 | } |
1205 | ||
ac34cdb0 | 1206 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 1207 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
ac34cdb0 | 1208 | { |
e45d1a18 TM |
1209 | struct user_namespace *userns = m->file->f_cred->user_ns; |
1210 | ||
ac34cdb0 | 1211 | show_expflags(m, flag, NFSEXP_ALLFLAGS); |
1da177e4 | 1212 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1213 | seq_printf(m, ",fsid=%d", fsid); |
e45d1a18 TM |
1214 | if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) && |
1215 | !uid_eq(anonu, make_kuid(userns, 0x10000-2))) | |
1216 | seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu)); | |
1217 | if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) && | |
1218 | !gid_eq(anong, make_kgid(userns, 0x10000-2))) | |
1219 | seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong)); | |
93346919 MN |
1220 | if (fsloc && fsloc->locations_count > 0) { |
1221 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1222 | int i; | |
1223 | ||
ac34cdb0 | 1224 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1225 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1226 | seq_putc(m, '@'); | |
1227 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1228 | for (i = 1; i < fsloc->locations_count; i++) { | |
1229 | seq_putc(m, ';'); | |
1230 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1231 | seq_putc(m, '@'); | |
1232 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1233 | } | |
1234 | } | |
1da177e4 LT |
1235 | } |
1236 | ||
1237 | static int e_show(struct seq_file *m, void *p) | |
1238 | { | |
1239 | struct cache_head *cp = p; | |
1240 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1241 | struct cache_detail *cd = m->private; |
1da177e4 | 1242 | |
bc6f02e5 | 1243 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1244 | seq_puts(m, "# Version 1.1\n"); |
1245 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
bf18f163 | 1249 | exp_get(exp); |
f2c7ea10 | 1250 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1251 | return 0; |
a09581f2 | 1252 | exp_put(exp); |
f2c7ea10 | 1253 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1254 | } |
1255 | ||
88e9d34c | 1256 | const struct seq_operations nfs_exports_op = { |
9ceddd9d TM |
1257 | .start = cache_seq_start_rcu, |
1258 | .next = cache_seq_next_rcu, | |
1259 | .stop = cache_seq_stop_rcu, | |
1da177e4 LT |
1260 | .show = e_show, |
1261 | }; | |
1262 | ||
1da177e4 LT |
1263 | /* |
1264 | * Initialize the exports module. | |
1265 | */ | |
dbf847ec | 1266 | int |
b89109be | 1267 | nfsd_export_init(struct net *net) |
1da177e4 | 1268 | { |
dbf847ec | 1269 | int rv; |
b3853e0e SK |
1270 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1271 | ||
ba589528 | 1272 | dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum); |
1da177e4 | 1273 | |
b3853e0e SK |
1274 | nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
1275 | if (IS_ERR(nn->svc_export_cache)) | |
1276 | return PTR_ERR(nn->svc_export_cache); | |
1277 | rv = cache_register_net(nn->svc_export_cache, net); | |
dbf847ec | 1278 | if (rv) |
b3853e0e SK |
1279 | goto destroy_export_cache; |
1280 | ||
e5f06f72 SK |
1281 | nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
1282 | if (IS_ERR(nn->svc_expkey_cache)) { | |
1283 | rv = PTR_ERR(nn->svc_expkey_cache); | |
b3853e0e | 1284 | goto unregister_export_cache; |
e5f06f72 SK |
1285 | } |
1286 | rv = cache_register_net(nn->svc_expkey_cache, net); | |
1287 | if (rv) | |
1288 | goto destroy_expkey_cache; | |
b3853e0e | 1289 | return 0; |
1da177e4 | 1290 | |
e5f06f72 SK |
1291 | destroy_expkey_cache: |
1292 | cache_destroy_net(nn->svc_expkey_cache, net); | |
b3853e0e SK |
1293 | unregister_export_cache: |
1294 | cache_unregister_net(nn->svc_export_cache, net); | |
1295 | destroy_export_cache: | |
1296 | cache_destroy_net(nn->svc_export_cache, net); | |
1297 | return rv; | |
1da177e4 LT |
1298 | } |
1299 | ||
1300 | /* | |
1301 | * Flush exports table - called when last nfsd thread is killed | |
1302 | */ | |
1303 | void | |
b3853e0e | 1304 | nfsd_export_flush(struct net *net) |
1da177e4 | 1305 | { |
b3853e0e SK |
1306 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1307 | ||
e5f06f72 | 1308 | cache_purge(nn->svc_expkey_cache); |
b3853e0e | 1309 | cache_purge(nn->svc_export_cache); |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | /* | |
1313 | * Shutdown the exports module. | |
1314 | */ | |
1315 | void | |
b89109be | 1316 | nfsd_export_shutdown(struct net *net) |
1da177e4 | 1317 | { |
b3853e0e | 1318 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 1319 | |
ba589528 | 1320 | dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum); |
1da177e4 | 1321 | |
e5f06f72 | 1322 | cache_unregister_net(nn->svc_expkey_cache, net); |
b3853e0e | 1323 | cache_unregister_net(nn->svc_export_cache, net); |
e5f06f72 | 1324 | cache_destroy_net(nn->svc_expkey_cache, net); |
b3853e0e | 1325 | cache_destroy_net(nn->svc_export_cache, net); |
e5f06f72 | 1326 | svcauth_unix_purge(net); |
1da177e4 | 1327 | |
ba589528 | 1328 | dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum); |
1da177e4 | 1329 | } |