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 | |
f15364bd | 20 | #include <net/ipv6.h> |
1da177e4 | 21 | |
9a74af21 | 22 | #include "nfsd.h" |
1557aca7 | 23 | #include "nfsfh.h" |
b3853e0e | 24 | #include "netns.h" |
9a74af21 | 25 | |
1da177e4 | 26 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 LT |
27 | |
28 | typedef struct auth_domain svc_client; | |
29 | typedef struct svc_export svc_export; | |
30 | ||
1da177e4 LT |
31 | /* |
32 | * We have two caches. | |
33 | * One maps client+vfsmnt+dentry to export options - the export map | |
34 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
35 | * | |
36 | * The export options are actually stored in the first map, and the | |
37 | * second map contains a reference to the entry in the first map. | |
38 | */ | |
39 | ||
40 | #define EXPKEY_HASHBITS 8 | |
41 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
42 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
1da177e4 | 43 | |
74cae61a | 44 | static void expkey_put(struct kref *ref) |
1da177e4 | 45 | { |
baab935f N |
46 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
47 | ||
48 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
49 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
50 | path_put(&key->ek_path); | |
baab935f N |
51 | auth_domain_put(key->ek_client); |
52 | kfree(key); | |
1da177e4 LT |
53 | } |
54 | ||
55 | static void expkey_request(struct cache_detail *cd, | |
56 | struct cache_head *h, | |
57 | char **bpp, int *blen) | |
58 | { | |
59 | /* client fsidtype \xfsid */ | |
60 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
61 | char type[5]; | |
62 | ||
63 | qword_add(bpp, blen, ek->ek_client->name); | |
64 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
65 | qword_add(bpp, blen, type); | |
66 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
67 | (*bpp)[-1] = '\n'; | |
68 | } | |
69 | ||
c89172e3 SK |
70 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
71 | struct svc_expkey *old); | |
72 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 73 | |
1da177e4 LT |
74 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
75 | { | |
76 | /* client fsidtype fsid [path] */ | |
77 | char *buf; | |
78 | int len; | |
79 | struct auth_domain *dom = NULL; | |
80 | int err; | |
81 | int fsidtype; | |
82 | char *ep; | |
83 | struct svc_expkey key; | |
30bc4dfd | 84 | struct svc_expkey *ek = NULL; |
1da177e4 | 85 | |
3476964d | 86 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
87 | return -EINVAL; |
88 | mesg[mlen-1] = 0; | |
89 | ||
90 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
91 | err = -ENOMEM; | |
30bc4dfd BF |
92 | if (!buf) |
93 | goto out; | |
1da177e4 LT |
94 | |
95 | err = -EINVAL; | |
96 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
97 | goto out; | |
98 | ||
99 | err = -ENOENT; | |
100 | dom = auth_domain_find(buf); | |
101 | if (!dom) | |
102 | goto out; | |
103 | dprintk("found domain %s\n", buf); | |
104 | ||
105 | err = -EINVAL; | |
106 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
107 | goto out; | |
108 | fsidtype = simple_strtoul(buf, &ep, 10); | |
109 | if (*ep) | |
110 | goto out; | |
111 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 112 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
113 | goto out; |
114 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
115 | goto out; | |
116 | dprintk("found fsid length %d\n", len); | |
117 | if (len != key_len(fsidtype)) | |
118 | goto out; | |
119 | ||
120 | /* OK, we seem to have a valid key */ | |
121 | key.h.flags = 0; | |
122 | key.h.expiry_time = get_expiry(&mesg); | |
123 | if (key.h.expiry_time == 0) | |
124 | goto out; | |
125 | ||
126 | key.ek_client = dom; | |
127 | key.ek_fsidtype = fsidtype; | |
128 | memcpy(key.ek_fsid, buf, len); | |
129 | ||
c89172e3 | 130 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
131 | err = -ENOMEM; |
132 | if (!ek) | |
133 | goto out; | |
134 | ||
1da177e4 | 135 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 136 | err = -EINVAL; |
30bc4dfd BF |
137 | len = qword_get(&mesg, buf, PAGE_SIZE); |
138 | if (len < 0) | |
1da177e4 LT |
139 | goto out; |
140 | dprintk("Path seems to be <%s>\n", buf); | |
141 | err = 0; | |
142 | if (len == 0) { | |
1da177e4 | 143 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 144 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd BF |
145 | if (!ek) |
146 | err = -ENOMEM; | |
1da177e4 | 147 | } else { |
a63bb996 | 148 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 149 | if (err) |
1da177e4 LT |
150 | goto out; |
151 | ||
152 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 153 | |
c89172e3 | 154 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd | 155 | if (!ek) |
8d270f7f | 156 | err = -ENOMEM; |
a63bb996 | 157 | path_put(&key.ek_path); |
1da177e4 LT |
158 | } |
159 | cache_flush(); | |
160 | out: | |
30bc4dfd | 161 | if (ek) |
d4bb527e | 162 | cache_put(&ek->h, cd); |
1da177e4 LT |
163 | if (dom) |
164 | auth_domain_put(dom); | |
f99d49ad | 165 | kfree(buf); |
1da177e4 LT |
166 | return err; |
167 | } | |
168 | ||
169 | static int expkey_show(struct seq_file *m, | |
170 | struct cache_detail *cd, | |
171 | struct cache_head *h) | |
172 | { | |
173 | struct svc_expkey *ek ; | |
af6a4e28 | 174 | int i; |
1da177e4 LT |
175 | |
176 | if (h ==NULL) { | |
177 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
178 | return 0; | |
179 | } | |
180 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
181 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
182 | ek->ek_fsidtype); | |
183 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
184 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
185 | if (test_bit(CACHE_VALID, &h->flags) && |
186 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
187 | seq_printf(m, " "); | |
c32c2f63 | 188 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
189 | } |
190 | seq_printf(m, "\n"); | |
191 | return 0; | |
192 | } | |
1da177e4 | 193 | |
8d270f7f | 194 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 195 | { |
8d270f7f N |
196 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
197 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
198 | ||
199 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
200 | orig->ek_client != new->ek_client || | |
201 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
202 | return 0; |
203 | return 1; | |
204 | } | |
205 | ||
8d270f7f N |
206 | static inline void expkey_init(struct cache_head *cnew, |
207 | struct cache_head *citem) | |
1da177e4 | 208 | { |
8d270f7f N |
209 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
210 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
211 | ||
efc36aa5 | 212 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
213 | new->ek_client = item->ek_client; |
214 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
215 | |
216 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
217 | } |
218 | ||
8d270f7f N |
219 | static inline void expkey_update(struct cache_head *cnew, |
220 | struct cache_head *citem) | |
1da177e4 | 221 | { |
8d270f7f N |
222 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
223 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
224 | ||
e83aece3 JB |
225 | new->ek_path = item->ek_path; |
226 | path_get(&item->ek_path); | |
1da177e4 LT |
227 | } |
228 | ||
8d270f7f N |
229 | static struct cache_head *expkey_alloc(void) |
230 | { | |
231 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
232 | if (i) | |
233 | return &i->h; | |
234 | else | |
235 | return NULL; | |
236 | } | |
237 | ||
e5f06f72 | 238 | static struct cache_detail svc_expkey_cache_template = { |
8d270f7f N |
239 | .owner = THIS_MODULE, |
240 | .hash_size = EXPKEY_HASHMAX, | |
8d270f7f N |
241 | .name = "nfsd.fh", |
242 | .cache_put = expkey_put, | |
73fb847a | 243 | .cache_request = expkey_request, |
8d270f7f N |
244 | .cache_parse = expkey_parse, |
245 | .cache_show = expkey_show, | |
246 | .match = expkey_match, | |
247 | .init = expkey_init, | |
248 | .update = expkey_update, | |
249 | .alloc = expkey_alloc, | |
250 | }; | |
251 | ||
61f8603d N |
252 | static int |
253 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 254 | { |
8d270f7f N |
255 | int hash = item->ek_fsidtype; |
256 | char * cp = (char*)item->ek_fsid; | |
257 | int len = key_len(item->ek_fsidtype); | |
258 | ||
259 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
260 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
261 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
262 | return hash; |
263 | } | |
264 | ||
265 | static struct svc_expkey * | |
c89172e3 | 266 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
61f8603d N |
267 | { |
268 | struct cache_head *ch; | |
269 | int hash = svc_expkey_hash(item); | |
8d270f7f | 270 | |
c89172e3 | 271 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
8d270f7f N |
272 | if (ch) |
273 | return container_of(ch, struct svc_expkey, h); | |
274 | else | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | static struct svc_expkey * | |
c89172e3 SK |
279 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
280 | struct svc_expkey *old) | |
8d270f7f N |
281 | { |
282 | struct cache_head *ch; | |
61f8603d | 283 | int hash = svc_expkey_hash(new); |
8d270f7f | 284 | |
c89172e3 | 285 | ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
8d270f7f N |
286 | if (ch) |
287 | return container_of(ch, struct svc_expkey, h); | |
288 | else | |
289 | return NULL; | |
290 | } | |
291 | ||
1da177e4 LT |
292 | |
293 | #define EXPORT_HASHBITS 8 | |
294 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
1da177e4 | 295 | |
93346919 MN |
296 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
297 | { | |
298 | int i; | |
299 | ||
300 | for (i = 0; i < fsloc->locations_count; i++) { | |
301 | kfree(fsloc->locations[i].path); | |
302 | kfree(fsloc->locations[i].hosts); | |
303 | } | |
304 | kfree(fsloc->locations); | |
305 | } | |
306 | ||
baab935f | 307 | static void svc_export_put(struct kref *ref) |
1da177e4 | 308 | { |
baab935f | 309 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 310 | path_put(&exp->ex_path); |
baab935f | 311 | auth_domain_put(exp->ex_client); |
93346919 | 312 | nfsd4_fslocs_free(&exp->ex_fslocs); |
885c91f7 | 313 | kfree(exp->ex_uuid); |
baab935f | 314 | kfree(exp); |
1da177e4 LT |
315 | } |
316 | ||
317 | static void svc_export_request(struct cache_detail *cd, | |
318 | struct cache_head *h, | |
319 | char **bpp, int *blen) | |
320 | { | |
321 | /* client path */ | |
322 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
323 | char *pth; | |
324 | ||
325 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 326 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
327 | if (IS_ERR(pth)) { |
328 | /* is this correct? */ | |
329 | (*bpp)[0] = '\n'; | |
330 | return; | |
331 | } | |
332 | qword_add(bpp, blen, pth); | |
333 | (*bpp)[-1] = '\n'; | |
334 | } | |
335 | ||
74cae61a AB |
336 | static struct svc_export *svc_export_update(struct svc_export *new, |
337 | struct svc_export *old); | |
4f7774c3 | 338 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 339 | |
774b1478 | 340 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
341 | { |
342 | ||
f2ca7153 BF |
343 | /* |
344 | * We currently export only dirs, regular files, and (for v4 | |
345 | * pseudoroot) symlinks. | |
1da177e4 LT |
346 | */ |
347 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 348 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
349 | !S_ISREG(inode->i_mode)) |
350 | return -ENOTDIR; | |
351 | ||
774b1478 BF |
352 | /* |
353 | * Mountd should never pass down a writeable V4ROOT export, but, | |
354 | * just to make sure: | |
355 | */ | |
356 | if (*flags & NFSEXP_V4ROOT) | |
357 | *flags |= NFSEXP_READONLY; | |
358 | ||
1da177e4 LT |
359 | /* There are two requirements on a filesystem to be exportable. |
360 | * 1: We must be able to identify the filesystem from a number. | |
361 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 362 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
363 | * 2: We must be able to find an inode from a filehandle. |
364 | * This means that s_export_op must be set. | |
365 | */ | |
366 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 367 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 368 | uuid == NULL) { |
3e3b4800 | 369 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
370 | return -EINVAL; |
371 | } | |
cfaea787 CH |
372 | |
373 | if (!inode->i_sb->s_export_op || | |
374 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
375 | dprintk("exp_export: export of invalid fs type.\n"); |
376 | return -EINVAL; | |
377 | } | |
378 | ||
1da177e4 LT |
379 | return 0; |
380 | ||
381 | } | |
382 | ||
93346919 MN |
383 | #ifdef CONFIG_NFSD_V4 |
384 | ||
385 | static int | |
386 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
387 | { | |
388 | int len; | |
389 | int migrated, i, err; | |
390 | ||
93346919 | 391 | /* listsize */ |
a007c4c3 | 392 | err = get_uint(mesg, &fsloc->locations_count); |
93346919 MN |
393 | if (err) |
394 | return err; | |
395 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
396 | return -EINVAL; | |
397 | if (fsloc->locations_count == 0) | |
398 | return 0; | |
399 | ||
400 | fsloc->locations = kzalloc(fsloc->locations_count | |
401 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
402 | if (!fsloc->locations) | |
403 | return -ENOMEM; | |
404 | for (i=0; i < fsloc->locations_count; i++) { | |
405 | /* colon separated host list */ | |
406 | err = -EINVAL; | |
407 | len = qword_get(mesg, buf, PAGE_SIZE); | |
408 | if (len <= 0) | |
409 | goto out_free_all; | |
410 | err = -ENOMEM; | |
411 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
412 | if (!fsloc->locations[i].hosts) | |
413 | goto out_free_all; | |
414 | err = -EINVAL; | |
415 | /* slash separated path component list */ | |
416 | len = qword_get(mesg, buf, PAGE_SIZE); | |
417 | if (len <= 0) | |
418 | goto out_free_all; | |
419 | err = -ENOMEM; | |
420 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
421 | if (!fsloc->locations[i].path) | |
422 | goto out_free_all; | |
423 | } | |
424 | /* migrated */ | |
425 | err = get_int(mesg, &migrated); | |
426 | if (err) | |
427 | goto out_free_all; | |
428 | err = -EINVAL; | |
429 | if (migrated < 0 || migrated > 1) | |
430 | goto out_free_all; | |
431 | fsloc->migrated = migrated; | |
432 | return 0; | |
433 | out_free_all: | |
434 | nfsd4_fslocs_free(fsloc); | |
435 | return err; | |
436 | } | |
437 | ||
e677bfe4 AA |
438 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
439 | { | |
440 | int listsize, err; | |
441 | struct exp_flavor_info *f; | |
442 | ||
443 | err = get_int(mesg, &listsize); | |
444 | if (err) | |
445 | return err; | |
446 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
447 | return -EINVAL; | |
448 | ||
449 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
a007c4c3 | 450 | err = get_uint(mesg, &f->pseudoflavor); |
e677bfe4 AA |
451 | if (err) |
452 | return err; | |
453 | /* | |
80492e7d RK |
454 | * XXX: It would be nice to also check whether this |
455 | * pseudoflavor is supported, so we can discover the | |
456 | * problem at export time instead of when a client fails | |
457 | * to authenticate. | |
e677bfe4 | 458 | */ |
a007c4c3 | 459 | err = get_uint(mesg, &f->flags); |
e677bfe4 AA |
460 | if (err) |
461 | return err; | |
462 | /* Only some flags are allowed to differ between flavors: */ | |
463 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
464 | return -EINVAL; | |
465 | } | |
466 | exp->ex_nflavors = listsize; | |
467 | return 0; | |
468 | } | |
469 | ||
93346919 | 470 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
471 | static inline int |
472 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
473 | static inline int | |
474 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
475 | #endif |
476 | ||
1da177e4 LT |
477 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
478 | { | |
479 | /* client path expiry [flags anonuid anongid fsid] */ | |
480 | char *buf; | |
481 | int len; | |
482 | int err; | |
483 | struct auth_domain *dom = NULL; | |
c1a2a475 | 484 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
485 | int an_int; |
486 | ||
1da177e4 LT |
487 | if (mesg[mlen-1] != '\n') |
488 | return -EINVAL; | |
489 | mesg[mlen-1] = 0; | |
490 | ||
491 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
492 | if (!buf) |
493 | return -ENOMEM; | |
1da177e4 LT |
494 | |
495 | /* client */ | |
1da177e4 | 496 | err = -EINVAL; |
c1a2a475 AV |
497 | len = qword_get(&mesg, buf, PAGE_SIZE); |
498 | if (len <= 0) | |
499 | goto out; | |
1da177e4 LT |
500 | |
501 | err = -ENOENT; | |
502 | dom = auth_domain_find(buf); | |
503 | if (!dom) | |
504 | goto out; | |
505 | ||
506 | /* path */ | |
507 | err = -EINVAL; | |
c1a2a475 AV |
508 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
509 | goto out1; | |
510 | ||
511 | err = kern_path(buf, 0, &exp.ex_path); | |
512 | if (err) | |
513 | goto out1; | |
1da177e4 | 514 | |
1da177e4 | 515 | exp.ex_client = dom; |
db3a3532 | 516 | exp.cd = cd; |
c1a2a475 | 517 | |
1da177e4 LT |
518 | /* expiry */ |
519 | err = -EINVAL; | |
520 | exp.h.expiry_time = get_expiry(&mesg); | |
521 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 522 | goto out3; |
1da177e4 LT |
523 | |
524 | /* flags */ | |
525 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
526 | if (err == -ENOENT) { |
527 | err = 0; | |
1da177e4 | 528 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 529 | } else { |
c1a2a475 AV |
530 | if (err || an_int < 0) |
531 | goto out3; | |
1da177e4 LT |
532 | exp.ex_flags= an_int; |
533 | ||
534 | /* anon uid */ | |
535 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
536 | if (err) |
537 | goto out3; | |
4c1e1b34 | 538 | exp.ex_anon_uid= make_kuid(&init_user_ns, an_int); |
1da177e4 LT |
539 | |
540 | /* anon gid */ | |
541 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
542 | if (err) |
543 | goto out3; | |
4c1e1b34 | 544 | exp.ex_anon_gid= make_kgid(&init_user_ns, an_int); |
1da177e4 LT |
545 | |
546 | /* fsid */ | |
547 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
548 | if (err) |
549 | goto out3; | |
1da177e4 LT |
550 | exp.ex_fsid = an_int; |
551 | ||
af6a4e28 N |
552 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
553 | if (strcmp(buf, "fsloc") == 0) | |
554 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
555 | else if (strcmp(buf, "uuid") == 0) { | |
556 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
557 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
558 | if (len != 16) | |
559 | err = -EINVAL; | |
560 | else { | |
561 | exp.ex_uuid = | |
562 | kmemdup(buf, 16, GFP_KERNEL); | |
563 | if (exp.ex_uuid == NULL) | |
564 | err = -ENOMEM; | |
565 | } | |
e677bfe4 AA |
566 | } else if (strcmp(buf, "secinfo") == 0) |
567 | err = secinfo_parse(&mesg, buf, &exp); | |
568 | else | |
af6a4e28 N |
569 | /* quietly ignore unknown words and anything |
570 | * following. Newer user-space can try to set | |
571 | * new values, then see what the result was. | |
572 | */ | |
573 | break; | |
574 | if (err) | |
c1a2a475 | 575 | goto out4; |
af6a4e28 | 576 | } |
93346919 | 577 | |
774b1478 | 578 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 579 | exp.ex_uuid); |
c1a2a475 AV |
580 | if (err) |
581 | goto out4; | |
8b7330f9 BF |
582 | /* |
583 | * For some reason exportfs has been passing down an | |
584 | * invalid (-1) uid & gid on the "dummy" export which it | |
585 | * uses to test export support. To make sure exportfs | |
586 | * sees errors from check_export we therefore need to | |
587 | * delay these checks till after check_export: | |
588 | */ | |
589 | if (!uid_valid(exp.ex_anon_uid)) | |
590 | goto out4; | |
591 | if (!gid_valid(exp.ex_anon_gid)) | |
592 | goto out4; | |
1da177e4 LT |
593 | } |
594 | ||
4f7774c3 | 595 | expp = svc_export_lookup(&exp); |
1da177e4 | 596 | if (expp) |
4f7774c3 N |
597 | expp = svc_export_update(&exp, expp); |
598 | else | |
599 | err = -ENOMEM; | |
1da177e4 | 600 | cache_flush(); |
4f7774c3 N |
601 | if (expp == NULL) |
602 | err = -ENOMEM; | |
603 | else | |
604 | exp_put(expp); | |
c1a2a475 | 605 | out4: |
af6a4e28 N |
606 | nfsd4_fslocs_free(&exp.ex_fslocs); |
607 | kfree(exp.ex_uuid); | |
c1a2a475 | 608 | out3: |
c1a2a475 AV |
609 | path_put(&exp.ex_path); |
610 | out1: | |
611 | auth_domain_put(dom); | |
612 | out: | |
f99d49ad | 613 | kfree(buf); |
1da177e4 LT |
614 | return err; |
615 | } | |
616 | ||
93346919 | 617 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 618 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
91fe39d3 | 619 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
620 | |
621 | static int svc_export_show(struct seq_file *m, | |
622 | struct cache_detail *cd, | |
623 | struct cache_head *h) | |
624 | { | |
625 | struct svc_export *exp ; | |
626 | ||
627 | if (h ==NULL) { | |
628 | seq_puts(m, "#path domain(flags)\n"); | |
629 | return 0; | |
630 | } | |
631 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 632 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
633 | seq_putc(m, '\t'); |
634 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
635 | seq_putc(m, '('); | |
636 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 637 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
638 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
639 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
640 | if (exp->ex_uuid) { |
641 | int i; | |
642 | seq_puts(m, ",uuid="); | |
643 | for (i=0; i<16; i++) { | |
644 | if ((i&3) == 0 && i) | |
645 | seq_putc(m, ':'); | |
646 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
647 | } | |
648 | } | |
91fe39d3 | 649 | show_secinfo(m, exp); |
af6a4e28 | 650 | } |
1da177e4 LT |
651 | seq_puts(m, ")\n"); |
652 | return 0; | |
653 | } | |
4f7774c3 | 654 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 655 | { |
4f7774c3 N |
656 | struct svc_export *orig = container_of(a, struct svc_export, h); |
657 | struct svc_export *new = container_of(b, struct svc_export, h); | |
658 | return orig->ex_client == new->ex_client && | |
54775491 JB |
659 | orig->ex_path.dentry == new->ex_path.dentry && |
660 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 661 | } |
4f7774c3 N |
662 | |
663 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 664 | { |
4f7774c3 N |
665 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
666 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
667 | ||
efc36aa5 | 668 | kref_get(&item->ex_client->ref); |
1da177e4 | 669 | new->ex_client = item->ex_client; |
54775491 JB |
670 | new->ex_path.dentry = dget(item->ex_path.dentry); |
671 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
93346919 MN |
672 | new->ex_fslocs.locations = NULL; |
673 | new->ex_fslocs.locations_count = 0; | |
674 | new->ex_fslocs.migrated = 0; | |
2eeb9b2a | 675 | new->ex_uuid = NULL; |
db3a3532 | 676 | new->cd = item->cd; |
1da177e4 LT |
677 | } |
678 | ||
4f7774c3 | 679 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 680 | { |
4f7774c3 N |
681 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
682 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 683 | int i; |
4f7774c3 | 684 | |
1da177e4 LT |
685 | new->ex_flags = item->ex_flags; |
686 | new->ex_anon_uid = item->ex_anon_uid; | |
687 | new->ex_anon_gid = item->ex_anon_gid; | |
688 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
689 | new->ex_uuid = item->ex_uuid; |
690 | item->ex_uuid = NULL; | |
93346919 MN |
691 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
692 | item->ex_fslocs.locations = NULL; | |
693 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
694 | item->ex_fslocs.locations_count = 0; | |
695 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
696 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
697 | new->ex_nflavors = item->ex_nflavors; |
698 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
699 | new->ex_flavors[i] = item->ex_flavors[i]; | |
700 | } | |
1da177e4 LT |
701 | } |
702 | ||
4f7774c3 N |
703 | static struct cache_head *svc_export_alloc(void) |
704 | { | |
705 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
706 | if (i) | |
707 | return &i->h; | |
708 | else | |
709 | return NULL; | |
710 | } | |
711 | ||
2355c596 | 712 | static struct cache_detail svc_export_cache_template = { |
4f7774c3 N |
713 | .owner = THIS_MODULE, |
714 | .hash_size = EXPORT_HASHMAX, | |
4f7774c3 N |
715 | .name = "nfsd.export", |
716 | .cache_put = svc_export_put, | |
73fb847a | 717 | .cache_request = svc_export_request, |
4f7774c3 N |
718 | .cache_parse = svc_export_parse, |
719 | .cache_show = svc_export_show, | |
720 | .match = svc_export_match, | |
721 | .init = svc_export_init, | |
722 | .update = export_update, | |
723 | .alloc = svc_export_alloc, | |
724 | }; | |
725 | ||
61f8603d N |
726 | static int |
727 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 728 | { |
4f7774c3 | 729 | int hash; |
61f8603d | 730 | |
4f7774c3 | 731 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
732 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
733 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
734 | return hash; |
735 | } | |
736 | ||
737 | static struct svc_export * | |
738 | svc_export_lookup(struct svc_export *exp) | |
739 | { | |
740 | struct cache_head *ch; | |
741 | int hash = svc_export_hash(exp); | |
4f7774c3 | 742 | |
db3a3532 | 743 | ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash); |
4f7774c3 N |
744 | if (ch) |
745 | return container_of(ch, struct svc_export, h); | |
746 | else | |
747 | return NULL; | |
748 | } | |
749 | ||
74cae61a | 750 | static struct svc_export * |
4f7774c3 N |
751 | svc_export_update(struct svc_export *new, struct svc_export *old) |
752 | { | |
753 | struct cache_head *ch; | |
61f8603d | 754 | int hash = svc_export_hash(old); |
4f7774c3 | 755 | |
db3a3532 | 756 | ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
4f7774c3 N |
757 | if (ch) |
758 | return container_of(ch, struct svc_export, h); | |
759 | else | |
760 | return NULL; | |
761 | } | |
1da177e4 LT |
762 | |
763 | ||
74cae61a | 764 | static struct svc_expkey * |
c89172e3 SK |
765 | exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type, |
766 | u32 *fsidv, struct cache_req *reqp) | |
1da177e4 LT |
767 | { |
768 | struct svc_expkey key, *ek; | |
769 | int err; | |
770 | ||
771 | if (!clp) | |
2d3bb252 | 772 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
773 | |
774 | key.ek_client = clp; | |
775 | key.ek_fsidtype = fsid_type; | |
776 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
777 | ||
c89172e3 | 778 | ek = svc_expkey_lookup(cd, &key); |
2d3bb252 BF |
779 | if (ek == NULL) |
780 | return ERR_PTR(-ENOMEM); | |
c89172e3 | 781 | err = cache_check(cd, &ek->h, reqp); |
2d3bb252 BF |
782 | if (err) |
783 | return ERR_PTR(err); | |
1da177e4 LT |
784 | return ek; |
785 | } | |
786 | ||
1da177e4 | 787 | |
2a75cfa6 SK |
788 | static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp, |
789 | const struct path *path, struct cache_req *reqp) | |
1da177e4 LT |
790 | { |
791 | struct svc_export *exp, key; | |
2d3bb252 | 792 | int err; |
e83aece3 | 793 | |
1da177e4 | 794 | if (!clp) |
2d3bb252 | 795 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
796 | |
797 | key.ex_client = clp; | |
55430e2e | 798 | key.ex_path = *path; |
2a75cfa6 | 799 | key.cd = cd; |
1da177e4 | 800 | |
4f7774c3 | 801 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
802 | if (exp == NULL) |
803 | return ERR_PTR(-ENOMEM); | |
2a75cfa6 | 804 | err = cache_check(cd, &exp->h, reqp); |
2d3bb252 BF |
805 | if (err) |
806 | return ERR_PTR(err); | |
1da177e4 LT |
807 | return exp; |
808 | } | |
809 | ||
810 | /* | |
811 | * Find the export entry for a given dentry. | |
812 | */ | |
2a75cfa6 SK |
813 | static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp, |
814 | struct path *path) | |
1da177e4 | 815 | { |
5bf3bd2b | 816 | struct dentry *saved = dget(path->dentry); |
2a75cfa6 | 817 | svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
5bf3bd2b AV |
818 | |
819 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
820 | struct dentry *parent = dget_parent(path->dentry); | |
821 | dput(path->dentry); | |
822 | path->dentry = parent; | |
2a75cfa6 | 823 | exp = exp_get_by_name(cd, clp, path, NULL); |
1da177e4 | 824 | } |
5bf3bd2b AV |
825 | dput(path->dentry); |
826 | path->dentry = saved; | |
1da177e4 LT |
827 | return exp; |
828 | } | |
829 | ||
1da177e4 | 830 | |
1da177e4 LT |
831 | |
832 | /* | |
833 | * Obtain the root fh on behalf of a client. | |
834 | * This could be done in user space, but I feel that it adds some safety | |
835 | * since its harder to fool a kernel module than a user space program. | |
836 | */ | |
837 | int | |
b3853e0e | 838 | exp_rootfh(struct net *net, svc_client *clp, char *name, |
2a75cfa6 | 839 | struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
840 | { |
841 | struct svc_export *exp; | |
a63bb996 | 842 | struct path path; |
1da177e4 LT |
843 | struct inode *inode; |
844 | struct svc_fh fh; | |
845 | int err; | |
b3853e0e SK |
846 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
847 | struct cache_detail *cd = nn->svc_export_cache; | |
1da177e4 LT |
848 | |
849 | err = -EPERM; | |
850 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
851 | if (kern_path(name, 0, &path)) { |
852 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
853 | return err; |
854 | } | |
a63bb996 | 855 | inode = path.dentry->d_inode; |
1da177e4 LT |
856 | |
857 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 858 | name, path.dentry, clp->name, |
1da177e4 | 859 | inode->i_sb->s_id, inode->i_ino); |
2a75cfa6 | 860 | exp = exp_parent(cd, clp, &path); |
4b41bd85 BF |
861 | if (IS_ERR(exp)) { |
862 | err = PTR_ERR(exp); | |
863 | goto out; | |
864 | } | |
1da177e4 LT |
865 | |
866 | /* | |
867 | * fh must be initialized before calling fh_compose | |
868 | */ | |
869 | fh_init(&fh, maxsize); | |
a63bb996 | 870 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
871 | err = -EINVAL; |
872 | else | |
873 | err = 0; | |
874 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
875 | fh_put(&fh); | |
876 | exp_put(exp); | |
877 | out: | |
a63bb996 | 878 | path_put(&path); |
1da177e4 LT |
879 | return err; |
880 | } | |
881 | ||
2a75cfa6 SK |
882 | static struct svc_export *exp_find(struct cache_detail *cd, |
883 | struct auth_domain *clp, int fsid_type, | |
cce76f9b | 884 | u32 *fsidv, struct cache_req *reqp) |
eab7e2e6 N |
885 | { |
886 | struct svc_export *exp; | |
e5f06f72 SK |
887 | struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
888 | struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 889 | if (IS_ERR(ek)) |
e231c2ee | 890 | return ERR_CAST(ek); |
eab7e2e6 | 891 | |
2a75cfa6 | 892 | exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
e5f06f72 | 893 | cache_put(&ek->h, nn->svc_expkey_cache); |
eab7e2e6 | 894 | |
2d3bb252 | 895 | if (IS_ERR(exp)) |
e231c2ee | 896 | return ERR_CAST(exp); |
eab7e2e6 N |
897 | return exp; |
898 | } | |
899 | ||
32c1eb0c AA |
900 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
901 | { | |
902 | struct exp_flavor_info *f; | |
903 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
904 | ||
905 | /* legacy gss-only clients are always OK: */ | |
906 | if (exp->ex_client == rqstp->rq_gssclient) | |
907 | return 0; | |
908 | /* ip-address based client; check sec= export option: */ | |
909 | for (f = exp->ex_flavors; f < end; f++) { | |
d5497fc6 | 910 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
32c1eb0c AA |
911 | return 0; |
912 | } | |
913 | /* defaults in absence of sec= options: */ | |
914 | if (exp->ex_nflavors == 0) { | |
d5497fc6 BF |
915 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
916 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) | |
32c1eb0c AA |
917 | return 0; |
918 | } | |
919 | return nfserr_wrongsec; | |
920 | } | |
921 | ||
0989a788 | 922 | /* |
2ea2209f BF |
923 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
924 | * auth_unix client) if it's available and has secinfo information; | |
925 | * otherwise, will try to use rq_gssclient. | |
926 | * | |
0989a788 BF |
927 | * Called from functions that handle requests; functions that do work on |
928 | * behalf of mountd are passed a single client name to use, and should | |
929 | * use exp_get_by_name() or exp_find(). | |
930 | */ | |
931 | struct svc_export * | |
91c9fa8f | 932 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 933 | { |
9a25b96c | 934 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 935 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 936 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
937 | |
938 | if (rqstp->rq_client == NULL) | |
939 | goto gss; | |
3ab4d8b1 | 940 | |
2ea2209f | 941 | /* First try the auth_unix client: */ |
2a75cfa6 | 942 | exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
943 | if (PTR_ERR(exp) == -ENOENT) |
944 | goto gss; | |
945 | if (IS_ERR(exp)) | |
946 | return exp; | |
947 | /* If it has secinfo, assume there are no gss/... clients */ | |
948 | if (exp->ex_nflavors > 0) | |
949 | return exp; | |
950 | gss: | |
951 | /* Otherwise, try falling back on gss client */ | |
952 | if (rqstp->rq_gssclient == NULL) | |
953 | return exp; | |
2a75cfa6 | 954 | gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
955 | if (PTR_ERR(gssexp) == -ENOENT) |
956 | return exp; | |
9a25b96c | 957 | if (!IS_ERR(exp)) |
2ea2209f BF |
958 | exp_put(exp); |
959 | return gssexp; | |
0989a788 BF |
960 | } |
961 | ||
962 | struct svc_export * | |
963 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
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 SK |
973 | exp = exp_find(cd, rqstp->rq_client, fsid_type, |
974 | fsidv, &rqstp->rq_chandle); | |
2ea2209f BF |
975 | if (PTR_ERR(exp) == -ENOENT) |
976 | goto gss; | |
977 | if (IS_ERR(exp)) | |
978 | return exp; | |
979 | /* If it has secinfo, assume there are no gss/... clients */ | |
980 | if (exp->ex_nflavors > 0) | |
981 | return exp; | |
982 | gss: | |
983 | /* Otherwise, try falling back on gss client */ | |
984 | if (rqstp->rq_gssclient == NULL) | |
985 | return exp; | |
2a75cfa6 | 986 | gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
2ea2209f BF |
987 | &rqstp->rq_chandle); |
988 | if (PTR_ERR(gssexp) == -ENOENT) | |
989 | return exp; | |
9a25b96c | 990 | if (!IS_ERR(exp)) |
2ea2209f BF |
991 | exp_put(exp); |
992 | return gssexp; | |
0989a788 BF |
993 | } |
994 | ||
995 | struct svc_export * | |
e64c390c | 996 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 997 | { |
e64c390c AV |
998 | struct dentry *saved = dget(path->dentry); |
999 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1000 | |
e64c390c AV |
1001 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1002 | struct dentry *parent = dget_parent(path->dentry); | |
1003 | dput(path->dentry); | |
1004 | path->dentry = parent; | |
1005 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1006 | } |
e64c390c AV |
1007 | dput(path->dentry); |
1008 | path->dentry = saved; | |
2ea2209f | 1009 | return exp; |
0989a788 | 1010 | } |
eab7e2e6 | 1011 | |
ed748aac | 1012 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1013 | { |
f39bde24 BF |
1014 | u32 fsidv[2]; |
1015 | ||
1016 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1017 | ||
260c64d2 | 1018 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1019 | } |
1020 | ||
1da177e4 LT |
1021 | /* |
1022 | * Called when we need the filehandle for the root of the pseudofs, | |
1023 | * for a given NFSv4 client. The root is defined to be the | |
1024 | * export point with fsid==0 | |
1025 | */ | |
c7afef1f | 1026 | __be32 |
df547efb | 1027 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1028 | { |
eab7e2e6 | 1029 | struct svc_export *exp; |
c7afef1f | 1030 | __be32 rv; |
1da177e4 | 1031 | |
ed748aac | 1032 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1033 | if (IS_ERR(exp)) |
1034 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1035 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1036 | exp_put(exp); |
1da177e4 LT |
1037 | return rv; |
1038 | } | |
1039 | ||
1040 | /* Iterator */ | |
1041 | ||
1042 | static void *e_start(struct seq_file *m, loff_t *pos) | |
f2c7ea10 | 1043 | __acquires(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 LT |
1044 | { |
1045 | loff_t n = *pos; | |
1046 | unsigned hash, export; | |
1047 | struct cache_head *ch; | |
f2c7ea10 | 1048 | struct cache_detail *cd = m->private; |
83e0ed70 | 1049 | struct cache_head **export_table = cd->hash_table; |
f2c7ea10 SK |
1050 | |
1051 | read_lock(&cd->hash_lock); | |
1da177e4 | 1052 | if (!n--) |
bc6f02e5 | 1053 | return SEQ_START_TOKEN; |
1da177e4 LT |
1054 | hash = n >> 32; |
1055 | export = n & ((1LL<<32) - 1); | |
1056 | ||
1057 | ||
1058 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1059 | if (!export--) | |
1060 | return ch; | |
1061 | n &= ~((1LL<<32) - 1); | |
1062 | do { | |
1063 | hash++; | |
1064 | n += 1LL<<32; | |
1065 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1066 | if (hash >= EXPORT_HASHMAX) | |
1067 | return NULL; | |
1068 | *pos = n+1; | |
1069 | return export_table[hash]; | |
1070 | } | |
1071 | ||
1072 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1073 | { | |
1074 | struct cache_head *ch = p; | |
1075 | int hash = (*pos >> 32); | |
83e0ed70 SK |
1076 | struct cache_detail *cd = m->private; |
1077 | struct cache_head **export_table = cd->hash_table; | |
1da177e4 | 1078 | |
bc6f02e5 | 1079 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1080 | hash = 0; |
1081 | else if (ch->next == NULL) { | |
1082 | hash++; | |
1083 | *pos += 1LL<<32; | |
1084 | } else { | |
1085 | ++*pos; | |
1086 | return ch->next; | |
1087 | } | |
1088 | *pos &= ~((1LL<<32) - 1); | |
1089 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1090 | hash++; | |
1091 | *pos += 1LL<<32; | |
1092 | } | |
1093 | if (hash >= EXPORT_HASHMAX) | |
1094 | return NULL; | |
1095 | ++*pos; | |
1096 | return export_table[hash]; | |
1097 | } | |
1098 | ||
1099 | static void e_stop(struct seq_file *m, void *p) | |
f2c7ea10 | 1100 | __releases(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 | 1101 | { |
f2c7ea10 SK |
1102 | struct cache_detail *cd = m->private; |
1103 | ||
1104 | read_unlock(&cd->hash_lock); | |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | static struct flags { | |
1108 | int flag; | |
1109 | char *name[2]; | |
1110 | } expflags[] = { | |
1111 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1112 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1113 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1114 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1115 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1116 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1117 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1118 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1119 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1120 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1121 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1122 | { 0, {"", ""}} |
1123 | }; | |
1124 | ||
ac34cdb0 | 1125 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1126 | { |
1da177e4 | 1127 | struct flags *flg; |
ac34cdb0 | 1128 | int state, first = 0; |
1da177e4 LT |
1129 | |
1130 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1131 | if (flg->flag & ~mask) |
1132 | continue; | |
1133 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1134 | if (*flg->name[state]) |
1135 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1136 | } | |
ac34cdb0 BF |
1137 | } |
1138 | ||
91fe39d3 BF |
1139 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1140 | { | |
1141 | seq_printf(m, ","); | |
1142 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1143 | } | |
1144 | ||
74ec1e12 BF |
1145 | static bool secinfo_flags_equal(int f, int g) |
1146 | { | |
1147 | f &= NFSEXP_SECINFO_FLAGS; | |
1148 | g &= NFSEXP_SECINFO_FLAGS; | |
1149 | return f == g; | |
1150 | } | |
1151 | ||
1152 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1153 | { | |
1154 | int flags; | |
1155 | ||
1156 | flags = (*fp)->flags; | |
1157 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1158 | (*fp)++; | |
1159 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1160 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1161 | (*fp)++; | |
1162 | } | |
1163 | return flags; | |
1164 | } | |
1165 | ||
91fe39d3 BF |
1166 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1167 | { | |
1168 | struct exp_flavor_info *f; | |
1169 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1170 | int flags; |
91fe39d3 BF |
1171 | |
1172 | if (exp->ex_nflavors == 0) | |
1173 | return; | |
74ec1e12 BF |
1174 | f = exp->ex_flavors; |
1175 | flags = show_secinfo_run(m, &f, end); | |
1176 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1177 | show_secinfo_flags(m, flags); | |
1178 | while (f != end) { | |
1179 | flags = show_secinfo_run(m, &f, end); | |
1180 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1181 | } |
91fe39d3 BF |
1182 | } |
1183 | ||
ac34cdb0 | 1184 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 1185 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
ac34cdb0 BF |
1186 | { |
1187 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1188 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1189 | seq_printf(m, ",fsid=%d", fsid); |
4c1e1b34 EB |
1190 | if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) && |
1191 | !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2))) | |
1192 | seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu)); | |
1193 | if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) && | |
1194 | !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2))) | |
1195 | seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong)); | |
93346919 MN |
1196 | if (fsloc && fsloc->locations_count > 0) { |
1197 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1198 | int i; | |
1199 | ||
ac34cdb0 | 1200 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1201 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1202 | seq_putc(m, '@'); | |
1203 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1204 | for (i = 1; i < fsloc->locations_count; i++) { | |
1205 | seq_putc(m, ';'); | |
1206 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1207 | seq_putc(m, '@'); | |
1208 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1209 | } | |
1210 | } | |
1da177e4 LT |
1211 | } |
1212 | ||
1213 | static int e_show(struct seq_file *m, void *p) | |
1214 | { | |
1215 | struct cache_head *cp = p; | |
1216 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1217 | struct cache_detail *cd = m->private; |
1da177e4 | 1218 | |
bc6f02e5 | 1219 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1220 | seq_puts(m, "# Version 1.1\n"); |
1221 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1222 | return 0; | |
1223 | } | |
1224 | ||
1da177e4 | 1225 | cache_get(&exp->h); |
f2c7ea10 | 1226 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1227 | return 0; |
a09581f2 | 1228 | exp_put(exp); |
f2c7ea10 | 1229 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1230 | } |
1231 | ||
88e9d34c | 1232 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1233 | .start = e_start, |
1234 | .next = e_next, | |
1235 | .stop = e_stop, | |
1236 | .show = e_show, | |
1237 | }; | |
1238 | ||
1da177e4 LT |
1239 | /* |
1240 | * Initialize the exports module. | |
1241 | */ | |
dbf847ec | 1242 | int |
b89109be | 1243 | nfsd_export_init(struct net *net) |
1da177e4 | 1244 | { |
dbf847ec | 1245 | int rv; |
b3853e0e SK |
1246 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1247 | ||
b89109be | 1248 | dprintk("nfsd: initializing export module (net: %p).\n", net); |
1da177e4 | 1249 | |
b3853e0e SK |
1250 | nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
1251 | if (IS_ERR(nn->svc_export_cache)) | |
1252 | return PTR_ERR(nn->svc_export_cache); | |
1253 | rv = cache_register_net(nn->svc_export_cache, net); | |
dbf847ec | 1254 | if (rv) |
b3853e0e SK |
1255 | goto destroy_export_cache; |
1256 | ||
e5f06f72 SK |
1257 | nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
1258 | if (IS_ERR(nn->svc_expkey_cache)) { | |
1259 | rv = PTR_ERR(nn->svc_expkey_cache); | |
b3853e0e | 1260 | goto unregister_export_cache; |
e5f06f72 SK |
1261 | } |
1262 | rv = cache_register_net(nn->svc_expkey_cache, net); | |
1263 | if (rv) | |
1264 | goto destroy_expkey_cache; | |
b3853e0e | 1265 | return 0; |
1da177e4 | 1266 | |
e5f06f72 SK |
1267 | destroy_expkey_cache: |
1268 | cache_destroy_net(nn->svc_expkey_cache, net); | |
b3853e0e SK |
1269 | unregister_export_cache: |
1270 | cache_unregister_net(nn->svc_export_cache, net); | |
1271 | destroy_export_cache: | |
1272 | cache_destroy_net(nn->svc_export_cache, net); | |
1273 | return rv; | |
1da177e4 LT |
1274 | } |
1275 | ||
1276 | /* | |
1277 | * Flush exports table - called when last nfsd thread is killed | |
1278 | */ | |
1279 | void | |
b3853e0e | 1280 | nfsd_export_flush(struct net *net) |
1da177e4 | 1281 | { |
b3853e0e SK |
1282 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1283 | ||
e5f06f72 | 1284 | cache_purge(nn->svc_expkey_cache); |
b3853e0e | 1285 | cache_purge(nn->svc_export_cache); |
1da177e4 LT |
1286 | } |
1287 | ||
1288 | /* | |
1289 | * Shutdown the exports module. | |
1290 | */ | |
1291 | void | |
b89109be | 1292 | nfsd_export_shutdown(struct net *net) |
1da177e4 | 1293 | { |
b3853e0e | 1294 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 1295 | |
b89109be | 1296 | dprintk("nfsd: shutting down export module (net: %p).\n", net); |
1da177e4 | 1297 | |
e5f06f72 | 1298 | cache_unregister_net(nn->svc_expkey_cache, net); |
b3853e0e | 1299 | cache_unregister_net(nn->svc_export_cache, net); |
e5f06f72 | 1300 | cache_destroy_net(nn->svc_expkey_cache, net); |
b3853e0e | 1301 | cache_destroy_net(nn->svc_export_cache, net); |
e5f06f72 | 1302 | svcauth_unix_purge(net); |
1da177e4 | 1303 | |
b89109be | 1304 | dprintk("nfsd: export shutdown complete (net: %p).\n", net); |
1da177e4 | 1305 | } |