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