Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * NFS exporting and validation. |
3 | * | |
4 | * We maintain a list of clients, each of which has a list of | |
5 | * exports. To export an fs to a given client, you first have | |
6 | * to create the client entry with NFSCTL_ADDCLIENT, which | |
7 | * creates a client control block and adds it to the hash | |
8 | * table. Then, you call NFSCTL_EXPORT for each fs. | |
9 | * | |
10 | * | |
11 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> | |
12 | */ | |
13 | ||
5a0e3ad6 | 14 | #include <linux/slab.h> |
1da177e4 | 15 | #include <linux/namei.h> |
f35279d3 | 16 | #include <linux/module.h> |
a5694255 | 17 | #include <linux/exportfs.h> |
b3853e0e | 18 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 19 | |
9a74af21 | 20 | #include "nfsd.h" |
1557aca7 | 21 | #include "nfsfh.h" |
b3853e0e | 22 | #include "netns.h" |
9a74af21 | 23 | |
1da177e4 | 24 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 | 25 | |
1da177e4 LT |
26 | /* |
27 | * We have two caches. | |
28 | * One maps client+vfsmnt+dentry to export options - the export map | |
29 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
30 | * | |
31 | * The export options are actually stored in the first map, and the | |
32 | * second map contains a reference to the entry in the first map. | |
33 | */ | |
34 | ||
35 | #define EXPKEY_HASHBITS 8 | |
36 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
37 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
1da177e4 | 38 | |
74cae61a | 39 | static void expkey_put(struct kref *ref) |
1da177e4 | 40 | { |
baab935f N |
41 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
42 | ||
43 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
44 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
45 | path_put(&key->ek_path); | |
baab935f N |
46 | auth_domain_put(key->ek_client); |
47 | kfree(key); | |
1da177e4 LT |
48 | } |
49 | ||
50 | static void expkey_request(struct cache_detail *cd, | |
51 | struct cache_head *h, | |
52 | char **bpp, int *blen) | |
53 | { | |
54 | /* client fsidtype \xfsid */ | |
55 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
56 | char type[5]; | |
57 | ||
58 | qword_add(bpp, blen, ek->ek_client->name); | |
59 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
60 | qword_add(bpp, blen, type); | |
61 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
62 | (*bpp)[-1] = '\n'; | |
63 | } | |
64 | ||
c89172e3 SK |
65 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
66 | struct svc_expkey *old); | |
67 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 68 | |
1da177e4 LT |
69 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
70 | { | |
f0db79d5 | 71 | /* client fsidtype fsid expiry [path] */ |
1da177e4 LT |
72 | char *buf; |
73 | int len; | |
74 | struct auth_domain *dom = NULL; | |
75 | int err; | |
76 | int fsidtype; | |
77 | char *ep; | |
78 | struct svc_expkey key; | |
30bc4dfd | 79 | struct svc_expkey *ek = NULL; |
1da177e4 | 80 | |
3476964d | 81 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
82 | return -EINVAL; |
83 | mesg[mlen-1] = 0; | |
84 | ||
85 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
86 | err = -ENOMEM; | |
30bc4dfd BF |
87 | if (!buf) |
88 | goto out; | |
1da177e4 LT |
89 | |
90 | err = -EINVAL; | |
91 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
92 | goto out; | |
93 | ||
94 | err = -ENOENT; | |
95 | dom = auth_domain_find(buf); | |
96 | if (!dom) | |
97 | goto out; | |
98 | dprintk("found domain %s\n", buf); | |
99 | ||
100 | err = -EINVAL; | |
101 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
102 | goto out; | |
103 | fsidtype = simple_strtoul(buf, &ep, 10); | |
104 | if (*ep) | |
105 | goto out; | |
106 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 107 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
108 | goto out; |
109 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
110 | goto out; | |
111 | dprintk("found fsid length %d\n", len); | |
112 | if (len != key_len(fsidtype)) | |
113 | goto out; | |
114 | ||
115 | /* OK, we seem to have a valid key */ | |
116 | key.h.flags = 0; | |
117 | key.h.expiry_time = get_expiry(&mesg); | |
118 | if (key.h.expiry_time == 0) | |
119 | goto out; | |
120 | ||
121 | key.ek_client = dom; | |
122 | key.ek_fsidtype = fsidtype; | |
123 | memcpy(key.ek_fsid, buf, len); | |
124 | ||
c89172e3 | 125 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
126 | err = -ENOMEM; |
127 | if (!ek) | |
128 | goto out; | |
129 | ||
1da177e4 | 130 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 131 | err = -EINVAL; |
30bc4dfd BF |
132 | len = qword_get(&mesg, buf, PAGE_SIZE); |
133 | if (len < 0) | |
1da177e4 LT |
134 | goto out; |
135 | dprintk("Path seems to be <%s>\n", buf); | |
136 | err = 0; | |
137 | if (len == 0) { | |
1da177e4 | 138 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 139 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd BF |
140 | if (!ek) |
141 | err = -ENOMEM; | |
1da177e4 | 142 | } else { |
a63bb996 | 143 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 144 | if (err) |
1da177e4 LT |
145 | goto out; |
146 | ||
147 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 148 | |
c89172e3 | 149 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd | 150 | if (!ek) |
8d270f7f | 151 | err = -ENOMEM; |
a63bb996 | 152 | path_put(&key.ek_path); |
1da177e4 LT |
153 | } |
154 | cache_flush(); | |
155 | out: | |
30bc4dfd | 156 | if (ek) |
d4bb527e | 157 | cache_put(&ek->h, cd); |
1da177e4 LT |
158 | if (dom) |
159 | auth_domain_put(dom); | |
f99d49ad | 160 | kfree(buf); |
1da177e4 LT |
161 | return err; |
162 | } | |
163 | ||
164 | static int expkey_show(struct seq_file *m, | |
165 | struct cache_detail *cd, | |
166 | struct cache_head *h) | |
167 | { | |
168 | struct svc_expkey *ek ; | |
af6a4e28 | 169 | int i; |
1da177e4 LT |
170 | |
171 | if (h ==NULL) { | |
172 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
173 | return 0; | |
174 | } | |
175 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
176 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
177 | ek->ek_fsidtype); | |
178 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
179 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
180 | if (test_bit(CACHE_VALID, &h->flags) && |
181 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
182 | seq_printf(m, " "); | |
c32c2f63 | 183 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
184 | } |
185 | seq_printf(m, "\n"); | |
186 | return 0; | |
187 | } | |
1da177e4 | 188 | |
8d270f7f | 189 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 190 | { |
8d270f7f N |
191 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
192 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
193 | ||
194 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
195 | orig->ek_client != new->ek_client || | |
196 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
197 | return 0; |
198 | return 1; | |
199 | } | |
200 | ||
8d270f7f N |
201 | static inline void expkey_init(struct cache_head *cnew, |
202 | struct cache_head *citem) | |
1da177e4 | 203 | { |
8d270f7f N |
204 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
205 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
206 | ||
efc36aa5 | 207 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
208 | new->ek_client = item->ek_client; |
209 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
210 | |
211 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
212 | } |
213 | ||
8d270f7f N |
214 | static inline void expkey_update(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 | ||
e83aece3 JB |
220 | new->ek_path = item->ek_path; |
221 | path_get(&item->ek_path); | |
1da177e4 LT |
222 | } |
223 | ||
8d270f7f N |
224 | static struct cache_head *expkey_alloc(void) |
225 | { | |
226 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
227 | if (i) | |
228 | return &i->h; | |
229 | else | |
230 | return NULL; | |
231 | } | |
232 | ||
e5f06f72 | 233 | static struct cache_detail svc_expkey_cache_template = { |
8d270f7f N |
234 | .owner = THIS_MODULE, |
235 | .hash_size = EXPKEY_HASHMAX, | |
8d270f7f N |
236 | .name = "nfsd.fh", |
237 | .cache_put = expkey_put, | |
73fb847a | 238 | .cache_request = expkey_request, |
8d270f7f N |
239 | .cache_parse = expkey_parse, |
240 | .cache_show = expkey_show, | |
241 | .match = expkey_match, | |
242 | .init = expkey_init, | |
243 | .update = expkey_update, | |
244 | .alloc = expkey_alloc, | |
245 | }; | |
246 | ||
61f8603d N |
247 | static int |
248 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 249 | { |
8d270f7f N |
250 | int hash = item->ek_fsidtype; |
251 | char * cp = (char*)item->ek_fsid; | |
252 | int len = key_len(item->ek_fsidtype); | |
253 | ||
254 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
255 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
256 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
257 | return hash; |
258 | } | |
259 | ||
260 | static struct svc_expkey * | |
c89172e3 | 261 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
61f8603d N |
262 | { |
263 | struct cache_head *ch; | |
264 | int hash = svc_expkey_hash(item); | |
8d270f7f | 265 | |
c89172e3 | 266 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
8d270f7f N |
267 | if (ch) |
268 | return container_of(ch, struct svc_expkey, h); | |
269 | else | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | static struct svc_expkey * | |
c89172e3 SK |
274 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
275 | struct svc_expkey *old) | |
8d270f7f N |
276 | { |
277 | struct cache_head *ch; | |
61f8603d | 278 | int hash = svc_expkey_hash(new); |
8d270f7f | 279 | |
c89172e3 | 280 | ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
8d270f7f N |
281 | if (ch) |
282 | return container_of(ch, struct svc_expkey, h); | |
283 | else | |
284 | return NULL; | |
285 | } | |
286 | ||
1da177e4 LT |
287 | |
288 | #define EXPORT_HASHBITS 8 | |
289 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
1da177e4 | 290 | |
93346919 MN |
291 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
292 | { | |
a1f05514 | 293 | struct nfsd4_fs_location *locations = fsloc->locations; |
93346919 MN |
294 | int i; |
295 | ||
a1f05514 KM |
296 | if (!locations) |
297 | return; | |
298 | ||
93346919 | 299 | for (i = 0; i < fsloc->locations_count; i++) { |
a1f05514 KM |
300 | kfree(locations[i].path); |
301 | kfree(locations[i].hosts); | |
93346919 | 302 | } |
a1f05514 KM |
303 | |
304 | kfree(locations); | |
305 | fsloc->locations = NULL; | |
93346919 MN |
306 | } |
307 | ||
baab935f | 308 | static void svc_export_put(struct kref *ref) |
1da177e4 | 309 | { |
baab935f | 310 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 311 | path_put(&exp->ex_path); |
baab935f | 312 | auth_domain_put(exp->ex_client); |
93346919 | 313 | nfsd4_fslocs_free(&exp->ex_fslocs); |
885c91f7 | 314 | kfree(exp->ex_uuid); |
baab935f | 315 | kfree(exp); |
1da177e4 LT |
316 | } |
317 | ||
318 | static void svc_export_request(struct cache_detail *cd, | |
319 | struct cache_head *h, | |
320 | char **bpp, int *blen) | |
321 | { | |
322 | /* client path */ | |
323 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
324 | char *pth; | |
325 | ||
326 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 327 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
328 | if (IS_ERR(pth)) { |
329 | /* is this correct? */ | |
330 | (*bpp)[0] = '\n'; | |
331 | return; | |
332 | } | |
333 | qword_add(bpp, blen, pth); | |
334 | (*bpp)[-1] = '\n'; | |
335 | } | |
336 | ||
74cae61a AB |
337 | static struct svc_export *svc_export_update(struct svc_export *new, |
338 | struct svc_export *old); | |
4f7774c3 | 339 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 340 | |
774b1478 | 341 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
342 | { |
343 | ||
f2ca7153 BF |
344 | /* |
345 | * We currently export only dirs, regular files, and (for v4 | |
346 | * pseudoroot) symlinks. | |
1da177e4 LT |
347 | */ |
348 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 349 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
350 | !S_ISREG(inode->i_mode)) |
351 | return -ENOTDIR; | |
352 | ||
774b1478 BF |
353 | /* |
354 | * Mountd should never pass down a writeable V4ROOT export, but, | |
355 | * just to make sure: | |
356 | */ | |
357 | if (*flags & NFSEXP_V4ROOT) | |
358 | *flags |= NFSEXP_READONLY; | |
359 | ||
1da177e4 LT |
360 | /* There are two requirements on a filesystem to be exportable. |
361 | * 1: We must be able to identify the filesystem from a number. | |
362 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 363 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
364 | * 2: We must be able to find an inode from a filehandle. |
365 | * This means that s_export_op must be set. | |
366 | */ | |
367 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 368 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 369 | uuid == NULL) { |
3e3b4800 | 370 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
371 | return -EINVAL; |
372 | } | |
cfaea787 CH |
373 | |
374 | if (!inode->i_sb->s_export_op || | |
375 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
376 | dprintk("exp_export: export of invalid fs type.\n"); |
377 | return -EINVAL; | |
378 | } | |
379 | ||
1da177e4 LT |
380 | return 0; |
381 | ||
382 | } | |
383 | ||
93346919 MN |
384 | #ifdef CONFIG_NFSD_V4 |
385 | ||
386 | static int | |
387 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
388 | { | |
389 | int len; | |
390 | int migrated, i, err; | |
391 | ||
be69da80 KM |
392 | /* more than one fsloc */ |
393 | if (fsloc->locations) | |
394 | return -EINVAL; | |
395 | ||
93346919 | 396 | /* listsize */ |
a007c4c3 | 397 | err = get_uint(mesg, &fsloc->locations_count); |
93346919 MN |
398 | if (err) |
399 | return err; | |
400 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
401 | return -EINVAL; | |
402 | if (fsloc->locations_count == 0) | |
403 | return 0; | |
404 | ||
405 | fsloc->locations = kzalloc(fsloc->locations_count | |
406 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
407 | if (!fsloc->locations) | |
408 | return -ENOMEM; | |
409 | for (i=0; i < fsloc->locations_count; i++) { | |
410 | /* colon separated host list */ | |
411 | err = -EINVAL; | |
412 | len = qword_get(mesg, buf, PAGE_SIZE); | |
413 | if (len <= 0) | |
414 | goto out_free_all; | |
415 | err = -ENOMEM; | |
416 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
417 | if (!fsloc->locations[i].hosts) | |
418 | goto out_free_all; | |
419 | err = -EINVAL; | |
420 | /* slash separated path component list */ | |
421 | len = qword_get(mesg, buf, PAGE_SIZE); | |
422 | if (len <= 0) | |
423 | goto out_free_all; | |
424 | err = -ENOMEM; | |
425 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
426 | if (!fsloc->locations[i].path) | |
427 | goto out_free_all; | |
428 | } | |
429 | /* migrated */ | |
430 | err = get_int(mesg, &migrated); | |
431 | if (err) | |
432 | goto out_free_all; | |
433 | err = -EINVAL; | |
434 | if (migrated < 0 || migrated > 1) | |
435 | goto out_free_all; | |
436 | fsloc->migrated = migrated; | |
437 | return 0; | |
438 | out_free_all: | |
439 | nfsd4_fslocs_free(fsloc); | |
440 | return err; | |
441 | } | |
442 | ||
e677bfe4 AA |
443 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
444 | { | |
e677bfe4 | 445 | struct exp_flavor_info *f; |
1f53146d KM |
446 | u32 listsize; |
447 | int err; | |
e677bfe4 | 448 | |
be69da80 KM |
449 | /* more than one secinfo */ |
450 | if (exp->ex_nflavors) | |
451 | return -EINVAL; | |
452 | ||
1f53146d | 453 | err = get_uint(mesg, &listsize); |
e677bfe4 AA |
454 | if (err) |
455 | return err; | |
1f53146d | 456 | if (listsize > MAX_SECINFO_LIST) |
e677bfe4 AA |
457 | return -EINVAL; |
458 | ||
459 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
a007c4c3 | 460 | err = get_uint(mesg, &f->pseudoflavor); |
e677bfe4 AA |
461 | if (err) |
462 | return err; | |
463 | /* | |
80492e7d RK |
464 | * XXX: It would be nice to also check whether this |
465 | * pseudoflavor is supported, so we can discover the | |
466 | * problem at export time instead of when a client fails | |
467 | * to authenticate. | |
e677bfe4 | 468 | */ |
a007c4c3 | 469 | err = get_uint(mesg, &f->flags); |
e677bfe4 AA |
470 | if (err) |
471 | return err; | |
472 | /* Only some flags are allowed to differ between flavors: */ | |
473 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
474 | return -EINVAL; | |
475 | } | |
476 | exp->ex_nflavors = listsize; | |
477 | return 0; | |
478 | } | |
479 | ||
93346919 | 480 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
481 | static inline int |
482 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
483 | static inline int | |
484 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
485 | #endif |
486 | ||
0d63790c KM |
487 | static inline int |
488 | uuid_parse(char **mesg, char *buf, unsigned char **puuid) | |
489 | { | |
490 | int len; | |
491 | ||
be69da80 KM |
492 | /* more than one uuid */ |
493 | if (*puuid) | |
494 | return -EINVAL; | |
495 | ||
0d63790c KM |
496 | /* expect a 16 byte uuid encoded as \xXXXX... */ |
497 | len = qword_get(mesg, buf, PAGE_SIZE); | |
94eb3689 | 498 | if (len != EX_UUID_LEN) |
0d63790c KM |
499 | return -EINVAL; |
500 | ||
94eb3689 | 501 | *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL); |
0d63790c KM |
502 | if (*puuid == NULL) |
503 | return -ENOMEM; | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
1da177e4 LT |
508 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
509 | { | |
510 | /* client path expiry [flags anonuid anongid fsid] */ | |
511 | char *buf; | |
512 | int len; | |
513 | int err; | |
514 | struct auth_domain *dom = NULL; | |
c1a2a475 | 515 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
516 | int an_int; |
517 | ||
1da177e4 LT |
518 | if (mesg[mlen-1] != '\n') |
519 | return -EINVAL; | |
520 | mesg[mlen-1] = 0; | |
521 | ||
522 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
523 | if (!buf) |
524 | return -ENOMEM; | |
1da177e4 LT |
525 | |
526 | /* client */ | |
1da177e4 | 527 | err = -EINVAL; |
c1a2a475 AV |
528 | len = qword_get(&mesg, buf, PAGE_SIZE); |
529 | if (len <= 0) | |
530 | goto out; | |
1da177e4 LT |
531 | |
532 | err = -ENOENT; | |
533 | dom = auth_domain_find(buf); | |
534 | if (!dom) | |
535 | goto out; | |
536 | ||
537 | /* path */ | |
538 | err = -EINVAL; | |
c1a2a475 AV |
539 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
540 | goto out1; | |
541 | ||
542 | err = kern_path(buf, 0, &exp.ex_path); | |
543 | if (err) | |
544 | goto out1; | |
1da177e4 | 545 | |
1da177e4 | 546 | exp.ex_client = dom; |
db3a3532 | 547 | exp.cd = cd; |
c1a2a475 | 548 | |
1da177e4 LT |
549 | /* expiry */ |
550 | err = -EINVAL; | |
551 | exp.h.expiry_time = get_expiry(&mesg); | |
552 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 553 | goto out3; |
1da177e4 LT |
554 | |
555 | /* flags */ | |
556 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
557 | if (err == -ENOENT) { |
558 | err = 0; | |
1da177e4 | 559 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 560 | } else { |
c1a2a475 AV |
561 | if (err || an_int < 0) |
562 | goto out3; | |
1da177e4 LT |
563 | exp.ex_flags= an_int; |
564 | ||
565 | /* anon uid */ | |
566 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
567 | if (err) |
568 | goto out3; | |
4c1e1b34 | 569 | exp.ex_anon_uid= make_kuid(&init_user_ns, an_int); |
1da177e4 LT |
570 | |
571 | /* anon gid */ | |
572 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
573 | if (err) |
574 | goto out3; | |
4c1e1b34 | 575 | exp.ex_anon_gid= make_kgid(&init_user_ns, an_int); |
1da177e4 LT |
576 | |
577 | /* fsid */ | |
578 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
579 | if (err) |
580 | goto out3; | |
1da177e4 LT |
581 | exp.ex_fsid = an_int; |
582 | ||
af6a4e28 N |
583 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
584 | if (strcmp(buf, "fsloc") == 0) | |
585 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
0d63790c KM |
586 | else if (strcmp(buf, "uuid") == 0) |
587 | err = uuid_parse(&mesg, buf, &exp.ex_uuid); | |
588 | else if (strcmp(buf, "secinfo") == 0) | |
e677bfe4 AA |
589 | err = secinfo_parse(&mesg, buf, &exp); |
590 | else | |
af6a4e28 N |
591 | /* quietly ignore unknown words and anything |
592 | * following. Newer user-space can try to set | |
593 | * new values, then see what the result was. | |
594 | */ | |
595 | break; | |
596 | if (err) | |
c1a2a475 | 597 | goto out4; |
af6a4e28 | 598 | } |
93346919 | 599 | |
774b1478 | 600 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 601 | exp.ex_uuid); |
c1a2a475 AV |
602 | if (err) |
603 | goto out4; | |
6f6cc320 BF |
604 | /* |
605 | * No point caching this if it would immediately expire. | |
606 | * Also, this protects exportfs's dummy export from the | |
607 | * anon_uid/anon_gid checks: | |
608 | */ | |
609 | if (exp.h.expiry_time < seconds_since_boot()) | |
610 | goto out4; | |
427d6c66 BF |
611 | /* |
612 | * For some reason exportfs has been passing down an | |
613 | * invalid (-1) uid & gid on the "dummy" export which it | |
614 | * uses to test export support. To make sure exportfs | |
615 | * sees errors from check_export we therefore need to | |
616 | * delay these checks till after check_export: | |
617 | */ | |
6f6cc320 | 618 | err = -EINVAL; |
427d6c66 BF |
619 | if (!uid_valid(exp.ex_anon_uid)) |
620 | goto out4; | |
621 | if (!gid_valid(exp.ex_anon_gid)) | |
622 | goto out4; | |
6f6cc320 | 623 | err = 0; |
1da177e4 LT |
624 | } |
625 | ||
4f7774c3 | 626 | expp = svc_export_lookup(&exp); |
1da177e4 | 627 | if (expp) |
4f7774c3 N |
628 | expp = svc_export_update(&exp, expp); |
629 | else | |
630 | err = -ENOMEM; | |
1da177e4 | 631 | cache_flush(); |
4f7774c3 N |
632 | if (expp == NULL) |
633 | err = -ENOMEM; | |
634 | else | |
635 | exp_put(expp); | |
c1a2a475 | 636 | out4: |
af6a4e28 N |
637 | nfsd4_fslocs_free(&exp.ex_fslocs); |
638 | kfree(exp.ex_uuid); | |
c1a2a475 | 639 | out3: |
c1a2a475 AV |
640 | path_put(&exp.ex_path); |
641 | out1: | |
642 | auth_domain_put(dom); | |
643 | out: | |
f99d49ad | 644 | kfree(buf); |
1da177e4 LT |
645 | return err; |
646 | } | |
647 | ||
93346919 | 648 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 649 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
91fe39d3 | 650 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
651 | |
652 | static int svc_export_show(struct seq_file *m, | |
653 | struct cache_detail *cd, | |
654 | struct cache_head *h) | |
655 | { | |
656 | struct svc_export *exp ; | |
657 | ||
658 | if (h ==NULL) { | |
659 | seq_puts(m, "#path domain(flags)\n"); | |
660 | return 0; | |
661 | } | |
662 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 663 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
664 | seq_putc(m, '\t'); |
665 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
666 | seq_putc(m, '('); | |
667 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 668 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
669 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
670 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
671 | if (exp->ex_uuid) { |
672 | int i; | |
673 | seq_puts(m, ",uuid="); | |
94eb3689 | 674 | for (i = 0; i < EX_UUID_LEN; i++) { |
af6a4e28 N |
675 | if ((i&3) == 0 && i) |
676 | seq_putc(m, ':'); | |
677 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
678 | } | |
679 | } | |
91fe39d3 | 680 | show_secinfo(m, exp); |
af6a4e28 | 681 | } |
1da177e4 LT |
682 | seq_puts(m, ")\n"); |
683 | return 0; | |
684 | } | |
4f7774c3 | 685 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 686 | { |
4f7774c3 N |
687 | struct svc_export *orig = container_of(a, struct svc_export, h); |
688 | struct svc_export *new = container_of(b, struct svc_export, h); | |
689 | return orig->ex_client == new->ex_client && | |
54775491 JB |
690 | orig->ex_path.dentry == new->ex_path.dentry && |
691 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 692 | } |
4f7774c3 N |
693 | |
694 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 695 | { |
4f7774c3 N |
696 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
697 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
698 | ||
efc36aa5 | 699 | kref_get(&item->ex_client->ref); |
1da177e4 | 700 | new->ex_client = item->ex_client; |
54775491 JB |
701 | new->ex_path.dentry = dget(item->ex_path.dentry); |
702 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
93346919 MN |
703 | new->ex_fslocs.locations = NULL; |
704 | new->ex_fslocs.locations_count = 0; | |
705 | new->ex_fslocs.migrated = 0; | |
2eeb9b2a | 706 | new->ex_uuid = NULL; |
db3a3532 | 707 | new->cd = item->cd; |
1da177e4 LT |
708 | } |
709 | ||
4f7774c3 | 710 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 711 | { |
4f7774c3 N |
712 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
713 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 714 | int i; |
4f7774c3 | 715 | |
1da177e4 LT |
716 | new->ex_flags = item->ex_flags; |
717 | new->ex_anon_uid = item->ex_anon_uid; | |
718 | new->ex_anon_gid = item->ex_anon_gid; | |
719 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
720 | new->ex_uuid = item->ex_uuid; |
721 | item->ex_uuid = NULL; | |
93346919 MN |
722 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
723 | item->ex_fslocs.locations = NULL; | |
724 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
725 | item->ex_fslocs.locations_count = 0; | |
726 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
727 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
728 | new->ex_nflavors = item->ex_nflavors; |
729 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
730 | new->ex_flavors[i] = item->ex_flavors[i]; | |
731 | } | |
1da177e4 LT |
732 | } |
733 | ||
4f7774c3 N |
734 | static struct cache_head *svc_export_alloc(void) |
735 | { | |
736 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
737 | if (i) | |
738 | return &i->h; | |
739 | else | |
740 | return NULL; | |
741 | } | |
742 | ||
2355c596 | 743 | static struct cache_detail svc_export_cache_template = { |
4f7774c3 N |
744 | .owner = THIS_MODULE, |
745 | .hash_size = EXPORT_HASHMAX, | |
4f7774c3 N |
746 | .name = "nfsd.export", |
747 | .cache_put = svc_export_put, | |
73fb847a | 748 | .cache_request = svc_export_request, |
4f7774c3 N |
749 | .cache_parse = svc_export_parse, |
750 | .cache_show = svc_export_show, | |
751 | .match = svc_export_match, | |
752 | .init = svc_export_init, | |
753 | .update = export_update, | |
754 | .alloc = svc_export_alloc, | |
755 | }; | |
756 | ||
61f8603d N |
757 | static int |
758 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 759 | { |
4f7774c3 | 760 | int hash; |
61f8603d | 761 | |
4f7774c3 | 762 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
763 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
764 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
765 | return hash; |
766 | } | |
767 | ||
768 | static struct svc_export * | |
769 | svc_export_lookup(struct svc_export *exp) | |
770 | { | |
771 | struct cache_head *ch; | |
772 | int hash = svc_export_hash(exp); | |
4f7774c3 | 773 | |
db3a3532 | 774 | ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash); |
4f7774c3 N |
775 | if (ch) |
776 | return container_of(ch, struct svc_export, h); | |
777 | else | |
778 | return NULL; | |
779 | } | |
780 | ||
74cae61a | 781 | static struct svc_export * |
4f7774c3 N |
782 | svc_export_update(struct svc_export *new, struct svc_export *old) |
783 | { | |
784 | struct cache_head *ch; | |
61f8603d | 785 | int hash = svc_export_hash(old); |
4f7774c3 | 786 | |
db3a3532 | 787 | ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
4f7774c3 N |
788 | if (ch) |
789 | return container_of(ch, struct svc_export, h); | |
790 | else | |
791 | return NULL; | |
792 | } | |
1da177e4 LT |
793 | |
794 | ||
74cae61a | 795 | static struct svc_expkey * |
e6d615f7 | 796 | exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type, |
c89172e3 | 797 | u32 *fsidv, struct cache_req *reqp) |
1da177e4 LT |
798 | { |
799 | struct svc_expkey key, *ek; | |
800 | int err; | |
801 | ||
802 | if (!clp) | |
2d3bb252 | 803 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
804 | |
805 | key.ek_client = clp; | |
806 | key.ek_fsidtype = fsid_type; | |
807 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
808 | ||
c89172e3 | 809 | ek = svc_expkey_lookup(cd, &key); |
2d3bb252 BF |
810 | if (ek == NULL) |
811 | return ERR_PTR(-ENOMEM); | |
c89172e3 | 812 | err = cache_check(cd, &ek->h, reqp); |
2d3bb252 BF |
813 | if (err) |
814 | return ERR_PTR(err); | |
1da177e4 LT |
815 | return ek; |
816 | } | |
817 | ||
e6d615f7 KM |
818 | static struct svc_export * |
819 | exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp, | |
820 | const struct path *path, struct cache_req *reqp) | |
1da177e4 LT |
821 | { |
822 | struct svc_export *exp, key; | |
2d3bb252 | 823 | int err; |
e83aece3 | 824 | |
1da177e4 | 825 | if (!clp) |
2d3bb252 | 826 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
827 | |
828 | key.ex_client = clp; | |
55430e2e | 829 | key.ex_path = *path; |
2a75cfa6 | 830 | key.cd = cd; |
1da177e4 | 831 | |
4f7774c3 | 832 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
833 | if (exp == NULL) |
834 | return ERR_PTR(-ENOMEM); | |
2a75cfa6 | 835 | err = cache_check(cd, &exp->h, reqp); |
2d3bb252 BF |
836 | if (err) |
837 | return ERR_PTR(err); | |
1da177e4 LT |
838 | return exp; |
839 | } | |
840 | ||
841 | /* | |
842 | * Find the export entry for a given dentry. | |
843 | */ | |
e6d615f7 KM |
844 | static struct svc_export * |
845 | exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path) | |
1da177e4 | 846 | { |
5bf3bd2b | 847 | struct dentry *saved = dget(path->dentry); |
e6d615f7 | 848 | struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
5bf3bd2b AV |
849 | |
850 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
851 | struct dentry *parent = dget_parent(path->dentry); | |
852 | dput(path->dentry); | |
853 | path->dentry = parent; | |
2a75cfa6 | 854 | exp = exp_get_by_name(cd, clp, path, NULL); |
1da177e4 | 855 | } |
5bf3bd2b AV |
856 | dput(path->dentry); |
857 | path->dentry = saved; | |
1da177e4 LT |
858 | return exp; |
859 | } | |
860 | ||
1da177e4 | 861 | |
1da177e4 LT |
862 | |
863 | /* | |
864 | * Obtain the root fh on behalf of a client. | |
865 | * This could be done in user space, but I feel that it adds some safety | |
866 | * since its harder to fool a kernel module than a user space program. | |
867 | */ | |
868 | int | |
e6d615f7 | 869 | exp_rootfh(struct net *net, struct auth_domain *clp, char *name, |
2a75cfa6 | 870 | struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
871 | { |
872 | struct svc_export *exp; | |
a63bb996 | 873 | struct path path; |
1da177e4 LT |
874 | struct inode *inode; |
875 | struct svc_fh fh; | |
876 | int err; | |
b3853e0e SK |
877 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
878 | struct cache_detail *cd = nn->svc_export_cache; | |
1da177e4 LT |
879 | |
880 | err = -EPERM; | |
881 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
882 | if (kern_path(name, 0, &path)) { |
883 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
884 | return err; |
885 | } | |
a63bb996 | 886 | inode = path.dentry->d_inode; |
1da177e4 LT |
887 | |
888 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 889 | name, path.dentry, clp->name, |
1da177e4 | 890 | inode->i_sb->s_id, inode->i_ino); |
2a75cfa6 | 891 | exp = exp_parent(cd, clp, &path); |
4b41bd85 BF |
892 | if (IS_ERR(exp)) { |
893 | err = PTR_ERR(exp); | |
894 | goto out; | |
895 | } | |
1da177e4 LT |
896 | |
897 | /* | |
898 | * fh must be initialized before calling fh_compose | |
899 | */ | |
900 | fh_init(&fh, maxsize); | |
a63bb996 | 901 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
902 | err = -EINVAL; |
903 | else | |
904 | err = 0; | |
905 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
906 | fh_put(&fh); | |
907 | exp_put(exp); | |
908 | out: | |
a63bb996 | 909 | path_put(&path); |
1da177e4 LT |
910 | return err; |
911 | } | |
912 | ||
2a75cfa6 SK |
913 | static struct svc_export *exp_find(struct cache_detail *cd, |
914 | struct auth_domain *clp, int fsid_type, | |
cce76f9b | 915 | u32 *fsidv, struct cache_req *reqp) |
eab7e2e6 N |
916 | { |
917 | struct svc_export *exp; | |
e5f06f72 SK |
918 | struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
919 | struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 920 | if (IS_ERR(ek)) |
e231c2ee | 921 | return ERR_CAST(ek); |
eab7e2e6 | 922 | |
2a75cfa6 | 923 | exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
e5f06f72 | 924 | cache_put(&ek->h, nn->svc_expkey_cache); |
eab7e2e6 | 925 | |
2d3bb252 | 926 | if (IS_ERR(exp)) |
e231c2ee | 927 | return ERR_CAST(exp); |
eab7e2e6 N |
928 | return exp; |
929 | } | |
930 | ||
32c1eb0c AA |
931 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
932 | { | |
933 | struct exp_flavor_info *f; | |
934 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
935 | ||
936 | /* legacy gss-only clients are always OK: */ | |
937 | if (exp->ex_client == rqstp->rq_gssclient) | |
938 | return 0; | |
939 | /* ip-address based client; check sec= export option: */ | |
940 | for (f = exp->ex_flavors; f < end; f++) { | |
d5497fc6 | 941 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
32c1eb0c AA |
942 | return 0; |
943 | } | |
944 | /* defaults in absence of sec= options: */ | |
945 | if (exp->ex_nflavors == 0) { | |
d5497fc6 BF |
946 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
947 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) | |
32c1eb0c AA |
948 | return 0; |
949 | } | |
950 | return nfserr_wrongsec; | |
951 | } | |
952 | ||
0989a788 | 953 | /* |
2ea2209f BF |
954 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
955 | * auth_unix client) if it's available and has secinfo information; | |
956 | * otherwise, will try to use rq_gssclient. | |
957 | * | |
0989a788 BF |
958 | * Called from functions that handle requests; functions that do work on |
959 | * behalf of mountd are passed a single client name to use, and should | |
960 | * use exp_get_by_name() or exp_find(). | |
961 | */ | |
962 | struct svc_export * | |
91c9fa8f | 963 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 964 | { |
9a25b96c | 965 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 966 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 967 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
968 | |
969 | if (rqstp->rq_client == NULL) | |
970 | goto gss; | |
3ab4d8b1 | 971 | |
2ea2209f | 972 | /* First try the auth_unix client: */ |
2a75cfa6 | 973 | exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
974 | if (PTR_ERR(exp) == -ENOENT) |
975 | goto gss; | |
976 | if (IS_ERR(exp)) | |
977 | return exp; | |
978 | /* If it has secinfo, assume there are no gss/... clients */ | |
979 | if (exp->ex_nflavors > 0) | |
980 | return exp; | |
981 | gss: | |
982 | /* Otherwise, try falling back on gss client */ | |
983 | if (rqstp->rq_gssclient == NULL) | |
984 | return exp; | |
2a75cfa6 | 985 | gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
986 | if (PTR_ERR(gssexp) == -ENOENT) |
987 | return exp; | |
9a25b96c | 988 | if (!IS_ERR(exp)) |
2ea2209f BF |
989 | exp_put(exp); |
990 | return gssexp; | |
0989a788 BF |
991 | } |
992 | ||
993 | struct svc_export * | |
994 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
995 | { | |
9a25b96c | 996 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 997 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 998 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
999 | |
1000 | if (rqstp->rq_client == NULL) | |
1001 | goto gss; | |
3ab4d8b1 | 1002 | |
2ea2209f | 1003 | /* First try the auth_unix client: */ |
2a75cfa6 SK |
1004 | exp = exp_find(cd, rqstp->rq_client, fsid_type, |
1005 | fsidv, &rqstp->rq_chandle); | |
2ea2209f BF |
1006 | if (PTR_ERR(exp) == -ENOENT) |
1007 | goto gss; | |
1008 | if (IS_ERR(exp)) | |
1009 | return exp; | |
1010 | /* If it has secinfo, assume there are no gss/... clients */ | |
1011 | if (exp->ex_nflavors > 0) | |
1012 | return exp; | |
1013 | gss: | |
1014 | /* Otherwise, try falling back on gss client */ | |
1015 | if (rqstp->rq_gssclient == NULL) | |
1016 | return exp; | |
2a75cfa6 | 1017 | gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
2ea2209f BF |
1018 | &rqstp->rq_chandle); |
1019 | if (PTR_ERR(gssexp) == -ENOENT) | |
1020 | return exp; | |
9a25b96c | 1021 | if (!IS_ERR(exp)) |
2ea2209f BF |
1022 | exp_put(exp); |
1023 | return gssexp; | |
0989a788 BF |
1024 | } |
1025 | ||
1026 | struct svc_export * | |
e64c390c | 1027 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1028 | { |
e64c390c AV |
1029 | struct dentry *saved = dget(path->dentry); |
1030 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1031 | |
e64c390c AV |
1032 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1033 | struct dentry *parent = dget_parent(path->dentry); | |
1034 | dput(path->dentry); | |
1035 | path->dentry = parent; | |
1036 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1037 | } |
e64c390c AV |
1038 | dput(path->dentry); |
1039 | path->dentry = saved; | |
2ea2209f | 1040 | return exp; |
0989a788 | 1041 | } |
eab7e2e6 | 1042 | |
ed748aac | 1043 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1044 | { |
f39bde24 BF |
1045 | u32 fsidv[2]; |
1046 | ||
1047 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1048 | ||
260c64d2 | 1049 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1050 | } |
1051 | ||
1da177e4 LT |
1052 | /* |
1053 | * Called when we need the filehandle for the root of the pseudofs, | |
1054 | * for a given NFSv4 client. The root is defined to be the | |
1055 | * export point with fsid==0 | |
1056 | */ | |
c7afef1f | 1057 | __be32 |
df547efb | 1058 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1059 | { |
eab7e2e6 | 1060 | struct svc_export *exp; |
c7afef1f | 1061 | __be32 rv; |
1da177e4 | 1062 | |
ed748aac | 1063 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1064 | if (IS_ERR(exp)) |
1065 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1066 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1067 | exp_put(exp); |
1da177e4 LT |
1068 | return rv; |
1069 | } | |
1070 | ||
1071 | /* Iterator */ | |
1072 | ||
1073 | static void *e_start(struct seq_file *m, loff_t *pos) | |
f2c7ea10 | 1074 | __acquires(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 LT |
1075 | { |
1076 | loff_t n = *pos; | |
1077 | unsigned hash, export; | |
1078 | struct cache_head *ch; | |
f2c7ea10 | 1079 | struct cache_detail *cd = m->private; |
83e0ed70 | 1080 | struct cache_head **export_table = cd->hash_table; |
f2c7ea10 SK |
1081 | |
1082 | read_lock(&cd->hash_lock); | |
1da177e4 | 1083 | if (!n--) |
bc6f02e5 | 1084 | return SEQ_START_TOKEN; |
1da177e4 LT |
1085 | hash = n >> 32; |
1086 | export = n & ((1LL<<32) - 1); | |
1087 | ||
1088 | ||
1089 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1090 | if (!export--) | |
1091 | return ch; | |
1092 | n &= ~((1LL<<32) - 1); | |
1093 | do { | |
1094 | hash++; | |
1095 | n += 1LL<<32; | |
1096 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1097 | if (hash >= EXPORT_HASHMAX) | |
1098 | return NULL; | |
1099 | *pos = n+1; | |
1100 | return export_table[hash]; | |
1101 | } | |
1102 | ||
1103 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1104 | { | |
1105 | struct cache_head *ch = p; | |
1106 | int hash = (*pos >> 32); | |
83e0ed70 SK |
1107 | struct cache_detail *cd = m->private; |
1108 | struct cache_head **export_table = cd->hash_table; | |
1da177e4 | 1109 | |
bc6f02e5 | 1110 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1111 | hash = 0; |
1112 | else if (ch->next == NULL) { | |
1113 | hash++; | |
1114 | *pos += 1LL<<32; | |
1115 | } else { | |
1116 | ++*pos; | |
1117 | return ch->next; | |
1118 | } | |
1119 | *pos &= ~((1LL<<32) - 1); | |
1120 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1121 | hash++; | |
1122 | *pos += 1LL<<32; | |
1123 | } | |
1124 | if (hash >= EXPORT_HASHMAX) | |
1125 | return NULL; | |
1126 | ++*pos; | |
1127 | return export_table[hash]; | |
1128 | } | |
1129 | ||
1130 | static void e_stop(struct seq_file *m, void *p) | |
f2c7ea10 | 1131 | __releases(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 | 1132 | { |
f2c7ea10 SK |
1133 | struct cache_detail *cd = m->private; |
1134 | ||
1135 | read_unlock(&cd->hash_lock); | |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | static struct flags { | |
1139 | int flag; | |
1140 | char *name[2]; | |
1141 | } expflags[] = { | |
1142 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1143 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1144 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1145 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1146 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1147 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1148 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1149 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1150 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1151 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1152 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1153 | { 0, {"", ""}} |
1154 | }; | |
1155 | ||
ac34cdb0 | 1156 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1157 | { |
1da177e4 | 1158 | struct flags *flg; |
ac34cdb0 | 1159 | int state, first = 0; |
1da177e4 LT |
1160 | |
1161 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1162 | if (flg->flag & ~mask) |
1163 | continue; | |
1164 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1165 | if (*flg->name[state]) |
1166 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1167 | } | |
ac34cdb0 BF |
1168 | } |
1169 | ||
91fe39d3 BF |
1170 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1171 | { | |
1172 | seq_printf(m, ","); | |
1173 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1174 | } | |
1175 | ||
74ec1e12 BF |
1176 | static bool secinfo_flags_equal(int f, int g) |
1177 | { | |
1178 | f &= NFSEXP_SECINFO_FLAGS; | |
1179 | g &= NFSEXP_SECINFO_FLAGS; | |
1180 | return f == g; | |
1181 | } | |
1182 | ||
1183 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1184 | { | |
1185 | int flags; | |
1186 | ||
1187 | flags = (*fp)->flags; | |
1188 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1189 | (*fp)++; | |
1190 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1191 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1192 | (*fp)++; | |
1193 | } | |
1194 | return flags; | |
1195 | } | |
1196 | ||
91fe39d3 BF |
1197 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1198 | { | |
1199 | struct exp_flavor_info *f; | |
1200 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1201 | int flags; |
91fe39d3 BF |
1202 | |
1203 | if (exp->ex_nflavors == 0) | |
1204 | return; | |
74ec1e12 BF |
1205 | f = exp->ex_flavors; |
1206 | flags = show_secinfo_run(m, &f, end); | |
1207 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1208 | show_secinfo_flags(m, flags); | |
1209 | while (f != end) { | |
1210 | flags = show_secinfo_run(m, &f, end); | |
1211 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1212 | } |
91fe39d3 BF |
1213 | } |
1214 | ||
ac34cdb0 | 1215 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 1216 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
ac34cdb0 BF |
1217 | { |
1218 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1219 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1220 | seq_printf(m, ",fsid=%d", fsid); |
4c1e1b34 EB |
1221 | if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) && |
1222 | !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2))) | |
1223 | seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu)); | |
1224 | if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) && | |
1225 | !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2))) | |
1226 | seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong)); | |
93346919 MN |
1227 | if (fsloc && fsloc->locations_count > 0) { |
1228 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1229 | int i; | |
1230 | ||
ac34cdb0 | 1231 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1232 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1233 | seq_putc(m, '@'); | |
1234 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1235 | for (i = 1; i < fsloc->locations_count; i++) { | |
1236 | seq_putc(m, ';'); | |
1237 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1238 | seq_putc(m, '@'); | |
1239 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1240 | } | |
1241 | } | |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | static int e_show(struct seq_file *m, void *p) | |
1245 | { | |
1246 | struct cache_head *cp = p; | |
1247 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1248 | struct cache_detail *cd = m->private; |
1da177e4 | 1249 | |
bc6f02e5 | 1250 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1251 | seq_puts(m, "# Version 1.1\n"); |
1252 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1da177e4 | 1256 | cache_get(&exp->h); |
f2c7ea10 | 1257 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1258 | return 0; |
a09581f2 | 1259 | exp_put(exp); |
f2c7ea10 | 1260 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1261 | } |
1262 | ||
88e9d34c | 1263 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1264 | .start = e_start, |
1265 | .next = e_next, | |
1266 | .stop = e_stop, | |
1267 | .show = e_show, | |
1268 | }; | |
1269 | ||
1da177e4 LT |
1270 | /* |
1271 | * Initialize the exports module. | |
1272 | */ | |
dbf847ec | 1273 | int |
b89109be | 1274 | nfsd_export_init(struct net *net) |
1da177e4 | 1275 | { |
dbf847ec | 1276 | int rv; |
b3853e0e SK |
1277 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1278 | ||
b89109be | 1279 | dprintk("nfsd: initializing export module (net: %p).\n", net); |
1da177e4 | 1280 | |
b3853e0e SK |
1281 | nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
1282 | if (IS_ERR(nn->svc_export_cache)) | |
1283 | return PTR_ERR(nn->svc_export_cache); | |
1284 | rv = cache_register_net(nn->svc_export_cache, net); | |
dbf847ec | 1285 | if (rv) |
b3853e0e SK |
1286 | goto destroy_export_cache; |
1287 | ||
e5f06f72 SK |
1288 | nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
1289 | if (IS_ERR(nn->svc_expkey_cache)) { | |
1290 | rv = PTR_ERR(nn->svc_expkey_cache); | |
b3853e0e | 1291 | goto unregister_export_cache; |
e5f06f72 SK |
1292 | } |
1293 | rv = cache_register_net(nn->svc_expkey_cache, net); | |
1294 | if (rv) | |
1295 | goto destroy_expkey_cache; | |
b3853e0e | 1296 | return 0; |
1da177e4 | 1297 | |
e5f06f72 SK |
1298 | destroy_expkey_cache: |
1299 | cache_destroy_net(nn->svc_expkey_cache, net); | |
b3853e0e SK |
1300 | unregister_export_cache: |
1301 | cache_unregister_net(nn->svc_export_cache, net); | |
1302 | destroy_export_cache: | |
1303 | cache_destroy_net(nn->svc_export_cache, net); | |
1304 | return rv; | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | /* | |
1308 | * Flush exports table - called when last nfsd thread is killed | |
1309 | */ | |
1310 | void | |
b3853e0e | 1311 | nfsd_export_flush(struct net *net) |
1da177e4 | 1312 | { |
b3853e0e SK |
1313 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1314 | ||
e5f06f72 | 1315 | cache_purge(nn->svc_expkey_cache); |
b3853e0e | 1316 | cache_purge(nn->svc_export_cache); |
1da177e4 LT |
1317 | } |
1318 | ||
1319 | /* | |
1320 | * Shutdown the exports module. | |
1321 | */ | |
1322 | void | |
b89109be | 1323 | nfsd_export_shutdown(struct net *net) |
1da177e4 | 1324 | { |
b3853e0e | 1325 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 1326 | |
b89109be | 1327 | dprintk("nfsd: shutting down export module (net: %p).\n", net); |
1da177e4 | 1328 | |
e5f06f72 | 1329 | cache_unregister_net(nn->svc_expkey_cache, net); |
b3853e0e | 1330 | cache_unregister_net(nn->svc_export_cache, net); |
e5f06f72 | 1331 | cache_destroy_net(nn->svc_expkey_cache, net); |
b3853e0e | 1332 | cache_destroy_net(nn->svc_export_cache, net); |
e5f06f72 | 1333 | svcauth_unix_purge(net); |
1da177e4 | 1334 | |
b89109be | 1335 | dprintk("nfsd: export shutdown complete (net: %p).\n", net); |
1da177e4 | 1336 | } |