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Commit | Line | Data |
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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> |
1da177e4 | 18 | |
f15364bd | 19 | #include <net/ipv6.h> |
1da177e4 | 20 | |
9a74af21 | 21 | #include "nfsd.h" |
1557aca7 | 22 | #include "nfsfh.h" |
9a74af21 | 23 | |
1da177e4 | 24 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 LT |
25 | |
26 | typedef struct auth_domain svc_client; | |
27 | typedef struct svc_export svc_export; | |
28 | ||
1da177e4 LT |
29 | /* |
30 | * We have two caches. | |
31 | * One maps client+vfsmnt+dentry to export options - the export map | |
32 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
33 | * | |
34 | * The export options are actually stored in the first map, and the | |
35 | * second map contains a reference to the entry in the first map. | |
36 | */ | |
37 | ||
38 | #define EXPKEY_HASHBITS 8 | |
39 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
40 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
41 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
42 | ||
74cae61a | 43 | static void expkey_put(struct kref *ref) |
1da177e4 | 44 | { |
baab935f N |
45 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
46 | ||
47 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
48 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
49 | path_put(&key->ek_path); | |
baab935f N |
50 | auth_domain_put(key->ek_client); |
51 | kfree(key); | |
1da177e4 LT |
52 | } |
53 | ||
54 | static void expkey_request(struct cache_detail *cd, | |
55 | struct cache_head *h, | |
56 | char **bpp, int *blen) | |
57 | { | |
58 | /* client fsidtype \xfsid */ | |
59 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
60 | char type[5]; | |
61 | ||
62 | qword_add(bpp, blen, ek->ek_client->name); | |
63 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
64 | qword_add(bpp, blen, type); | |
65 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
66 | (*bpp)[-1] = '\n'; | |
67 | } | |
68 | ||
bc74b4f5 TM |
69 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
70 | { | |
71 | return sunrpc_cache_pipe_upcall(cd, h, expkey_request); | |
72 | } | |
73 | ||
c89172e3 SK |
74 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
75 | struct svc_expkey *old); | |
76 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 77 | |
1da177e4 LT |
78 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
79 | { | |
80 | /* client fsidtype fsid [path] */ | |
81 | char *buf; | |
82 | int len; | |
83 | struct auth_domain *dom = NULL; | |
84 | int err; | |
85 | int fsidtype; | |
86 | char *ep; | |
87 | struct svc_expkey key; | |
30bc4dfd | 88 | struct svc_expkey *ek = NULL; |
1da177e4 | 89 | |
3476964d | 90 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
91 | return -EINVAL; |
92 | mesg[mlen-1] = 0; | |
93 | ||
94 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
95 | err = -ENOMEM; | |
30bc4dfd BF |
96 | if (!buf) |
97 | goto out; | |
1da177e4 LT |
98 | |
99 | err = -EINVAL; | |
100 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
101 | goto out; | |
102 | ||
103 | err = -ENOENT; | |
104 | dom = auth_domain_find(buf); | |
105 | if (!dom) | |
106 | goto out; | |
107 | dprintk("found domain %s\n", buf); | |
108 | ||
109 | err = -EINVAL; | |
110 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
111 | goto out; | |
112 | fsidtype = simple_strtoul(buf, &ep, 10); | |
113 | if (*ep) | |
114 | goto out; | |
115 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 116 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
117 | goto out; |
118 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
119 | goto out; | |
120 | dprintk("found fsid length %d\n", len); | |
121 | if (len != key_len(fsidtype)) | |
122 | goto out; | |
123 | ||
124 | /* OK, we seem to have a valid key */ | |
125 | key.h.flags = 0; | |
126 | key.h.expiry_time = get_expiry(&mesg); | |
127 | if (key.h.expiry_time == 0) | |
128 | goto out; | |
129 | ||
130 | key.ek_client = dom; | |
131 | key.ek_fsidtype = fsidtype; | |
132 | memcpy(key.ek_fsid, buf, len); | |
133 | ||
c89172e3 | 134 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
135 | err = -ENOMEM; |
136 | if (!ek) | |
137 | goto out; | |
138 | ||
1da177e4 | 139 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 140 | err = -EINVAL; |
30bc4dfd BF |
141 | len = qword_get(&mesg, buf, PAGE_SIZE); |
142 | if (len < 0) | |
1da177e4 LT |
143 | goto out; |
144 | dprintk("Path seems to be <%s>\n", buf); | |
145 | err = 0; | |
146 | if (len == 0) { | |
1da177e4 | 147 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 148 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd BF |
149 | if (!ek) |
150 | err = -ENOMEM; | |
1da177e4 | 151 | } else { |
a63bb996 | 152 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 153 | if (err) |
1da177e4 LT |
154 | goto out; |
155 | ||
156 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 157 | |
c89172e3 | 158 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd | 159 | if (!ek) |
8d270f7f | 160 | err = -ENOMEM; |
a63bb996 | 161 | path_put(&key.ek_path); |
1da177e4 LT |
162 | } |
163 | cache_flush(); | |
164 | out: | |
30bc4dfd | 165 | if (ek) |
d4bb527e | 166 | cache_put(&ek->h, cd); |
1da177e4 LT |
167 | if (dom) |
168 | auth_domain_put(dom); | |
f99d49ad | 169 | kfree(buf); |
1da177e4 LT |
170 | return err; |
171 | } | |
172 | ||
173 | static int expkey_show(struct seq_file *m, | |
174 | struct cache_detail *cd, | |
175 | struct cache_head *h) | |
176 | { | |
177 | struct svc_expkey *ek ; | |
af6a4e28 | 178 | int i; |
1da177e4 LT |
179 | |
180 | if (h ==NULL) { | |
181 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
182 | return 0; | |
183 | } | |
184 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
185 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
186 | ek->ek_fsidtype); | |
187 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
188 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
189 | if (test_bit(CACHE_VALID, &h->flags) && |
190 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
191 | seq_printf(m, " "); | |
c32c2f63 | 192 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
193 | } |
194 | seq_printf(m, "\n"); | |
195 | return 0; | |
196 | } | |
1da177e4 | 197 | |
8d270f7f | 198 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 199 | { |
8d270f7f N |
200 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
201 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
202 | ||
203 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
204 | orig->ek_client != new->ek_client || | |
205 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
206 | return 0; |
207 | return 1; | |
208 | } | |
209 | ||
8d270f7f N |
210 | static inline void expkey_init(struct cache_head *cnew, |
211 | struct cache_head *citem) | |
1da177e4 | 212 | { |
8d270f7f N |
213 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
214 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
215 | ||
efc36aa5 | 216 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
217 | new->ek_client = item->ek_client; |
218 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
219 | |
220 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
221 | } |
222 | ||
8d270f7f N |
223 | static inline void expkey_update(struct cache_head *cnew, |
224 | struct cache_head *citem) | |
1da177e4 | 225 | { |
8d270f7f N |
226 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
227 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
228 | ||
e83aece3 JB |
229 | new->ek_path = item->ek_path; |
230 | path_get(&item->ek_path); | |
1da177e4 LT |
231 | } |
232 | ||
8d270f7f N |
233 | static struct cache_head *expkey_alloc(void) |
234 | { | |
235 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
236 | if (i) | |
237 | return &i->h; | |
238 | else | |
239 | return NULL; | |
240 | } | |
241 | ||
74cae61a | 242 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
243 | .owner = THIS_MODULE, |
244 | .hash_size = EXPKEY_HASHMAX, | |
245 | .hash_table = expkey_table, | |
246 | .name = "nfsd.fh", | |
247 | .cache_put = expkey_put, | |
bc74b4f5 | 248 | .cache_upcall = expkey_upcall, |
8d270f7f N |
249 | .cache_parse = expkey_parse, |
250 | .cache_show = expkey_show, | |
251 | .match = expkey_match, | |
252 | .init = expkey_init, | |
253 | .update = expkey_update, | |
254 | .alloc = expkey_alloc, | |
255 | }; | |
256 | ||
61f8603d N |
257 | static int |
258 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 259 | { |
8d270f7f N |
260 | int hash = item->ek_fsidtype; |
261 | char * cp = (char*)item->ek_fsid; | |
262 | int len = key_len(item->ek_fsidtype); | |
263 | ||
264 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
265 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
266 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
267 | return hash; |
268 | } | |
269 | ||
270 | static struct svc_expkey * | |
c89172e3 | 271 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
61f8603d N |
272 | { |
273 | struct cache_head *ch; | |
274 | int hash = svc_expkey_hash(item); | |
8d270f7f | 275 | |
c89172e3 | 276 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
8d270f7f N |
277 | if (ch) |
278 | return container_of(ch, struct svc_expkey, h); | |
279 | else | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | static struct svc_expkey * | |
c89172e3 SK |
284 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
285 | struct svc_expkey *old) | |
8d270f7f N |
286 | { |
287 | struct cache_head *ch; | |
61f8603d | 288 | int hash = svc_expkey_hash(new); |
8d270f7f | 289 | |
c89172e3 | 290 | ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
8d270f7f N |
291 | if (ch) |
292 | return container_of(ch, struct svc_expkey, h); | |
293 | else | |
294 | return NULL; | |
295 | } | |
296 | ||
1da177e4 LT |
297 | |
298 | #define EXPORT_HASHBITS 8 | |
299 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
1da177e4 LT |
300 | |
301 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
302 | ||
93346919 MN |
303 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
304 | { | |
305 | int i; | |
306 | ||
307 | for (i = 0; i < fsloc->locations_count; i++) { | |
308 | kfree(fsloc->locations[i].path); | |
309 | kfree(fsloc->locations[i].hosts); | |
310 | } | |
311 | kfree(fsloc->locations); | |
312 | } | |
313 | ||
baab935f | 314 | static void svc_export_put(struct kref *ref) |
1da177e4 | 315 | { |
baab935f | 316 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 317 | path_put(&exp->ex_path); |
baab935f | 318 | auth_domain_put(exp->ex_client); |
93346919 | 319 | nfsd4_fslocs_free(&exp->ex_fslocs); |
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 | ||
bc74b4f5 TM |
342 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
343 | { | |
344 | return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); | |
345 | } | |
346 | ||
74cae61a AB |
347 | static struct svc_export *svc_export_update(struct svc_export *new, |
348 | struct svc_export *old); | |
4f7774c3 | 349 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 350 | |
774b1478 | 351 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
352 | { |
353 | ||
f2ca7153 BF |
354 | /* |
355 | * We currently export only dirs, regular files, and (for v4 | |
356 | * pseudoroot) symlinks. | |
1da177e4 LT |
357 | */ |
358 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 359 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
360 | !S_ISREG(inode->i_mode)) |
361 | return -ENOTDIR; | |
362 | ||
774b1478 BF |
363 | /* |
364 | * Mountd should never pass down a writeable V4ROOT export, but, | |
365 | * just to make sure: | |
366 | */ | |
367 | if (*flags & NFSEXP_V4ROOT) | |
368 | *flags |= NFSEXP_READONLY; | |
369 | ||
1da177e4 LT |
370 | /* There are two requirements on a filesystem to be exportable. |
371 | * 1: We must be able to identify the filesystem from a number. | |
372 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 373 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
374 | * 2: We must be able to find an inode from a filehandle. |
375 | * This means that s_export_op must be set. | |
376 | */ | |
377 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 378 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 379 | uuid == NULL) { |
3e3b4800 | 380 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
381 | return -EINVAL; |
382 | } | |
cfaea787 CH |
383 | |
384 | if (!inode->i_sb->s_export_op || | |
385 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
386 | dprintk("exp_export: export of invalid fs type.\n"); |
387 | return -EINVAL; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | return 0; |
391 | ||
392 | } | |
393 | ||
93346919 MN |
394 | #ifdef CONFIG_NFSD_V4 |
395 | ||
396 | static int | |
397 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
398 | { | |
399 | int len; | |
400 | int migrated, i, err; | |
401 | ||
93346919 MN |
402 | /* listsize */ |
403 | err = get_int(mesg, &fsloc->locations_count); | |
404 | if (err) | |
405 | return err; | |
406 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
407 | return -EINVAL; | |
408 | if (fsloc->locations_count == 0) | |
409 | return 0; | |
410 | ||
411 | fsloc->locations = kzalloc(fsloc->locations_count | |
412 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
413 | if (!fsloc->locations) | |
414 | return -ENOMEM; | |
415 | for (i=0; i < fsloc->locations_count; i++) { | |
416 | /* colon separated host list */ | |
417 | err = -EINVAL; | |
418 | len = qword_get(mesg, buf, PAGE_SIZE); | |
419 | if (len <= 0) | |
420 | goto out_free_all; | |
421 | err = -ENOMEM; | |
422 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
423 | if (!fsloc->locations[i].hosts) | |
424 | goto out_free_all; | |
425 | err = -EINVAL; | |
426 | /* slash separated path component list */ | |
427 | len = qword_get(mesg, buf, PAGE_SIZE); | |
428 | if (len <= 0) | |
429 | goto out_free_all; | |
430 | err = -ENOMEM; | |
431 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
432 | if (!fsloc->locations[i].path) | |
433 | goto out_free_all; | |
434 | } | |
435 | /* migrated */ | |
436 | err = get_int(mesg, &migrated); | |
437 | if (err) | |
438 | goto out_free_all; | |
439 | err = -EINVAL; | |
440 | if (migrated < 0 || migrated > 1) | |
441 | goto out_free_all; | |
442 | fsloc->migrated = migrated; | |
443 | return 0; | |
444 | out_free_all: | |
445 | nfsd4_fslocs_free(fsloc); | |
446 | return err; | |
447 | } | |
448 | ||
e677bfe4 AA |
449 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
450 | { | |
451 | int listsize, err; | |
452 | struct exp_flavor_info *f; | |
453 | ||
454 | err = get_int(mesg, &listsize); | |
455 | if (err) | |
456 | return err; | |
457 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
458 | return -EINVAL; | |
459 | ||
460 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
461 | err = get_int(mesg, &f->pseudoflavor); | |
462 | if (err) | |
463 | return err; | |
464 | /* | |
80492e7d RK |
465 | * XXX: It would be nice to also check whether this |
466 | * pseudoflavor is supported, so we can discover the | |
467 | * problem at export time instead of when a client fails | |
468 | * to authenticate. | |
e677bfe4 | 469 | */ |
e677bfe4 AA |
470 | err = get_int(mesg, &f->flags); |
471 | if (err) | |
472 | return err; | |
473 | /* Only some flags are allowed to differ between flavors: */ | |
474 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
475 | return -EINVAL; | |
476 | } | |
477 | exp->ex_nflavors = listsize; | |
478 | return 0; | |
479 | } | |
480 | ||
93346919 | 481 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
482 | static inline int |
483 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
484 | static inline int | |
485 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
486 | #endif |
487 | ||
1da177e4 LT |
488 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
489 | { | |
490 | /* client path expiry [flags anonuid anongid fsid] */ | |
491 | char *buf; | |
492 | int len; | |
493 | int err; | |
494 | struct auth_domain *dom = NULL; | |
c1a2a475 | 495 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
496 | int an_int; |
497 | ||
1da177e4 LT |
498 | if (mesg[mlen-1] != '\n') |
499 | return -EINVAL; | |
500 | mesg[mlen-1] = 0; | |
501 | ||
502 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
503 | if (!buf) |
504 | return -ENOMEM; | |
1da177e4 LT |
505 | |
506 | /* client */ | |
1da177e4 | 507 | err = -EINVAL; |
c1a2a475 AV |
508 | len = qword_get(&mesg, buf, PAGE_SIZE); |
509 | if (len <= 0) | |
510 | goto out; | |
1da177e4 LT |
511 | |
512 | err = -ENOENT; | |
513 | dom = auth_domain_find(buf); | |
514 | if (!dom) | |
515 | goto out; | |
516 | ||
517 | /* path */ | |
518 | err = -EINVAL; | |
c1a2a475 AV |
519 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
520 | goto out1; | |
521 | ||
522 | err = kern_path(buf, 0, &exp.ex_path); | |
523 | if (err) | |
524 | goto out1; | |
1da177e4 | 525 | |
1da177e4 | 526 | exp.ex_client = dom; |
db3a3532 | 527 | exp.cd = cd; |
c1a2a475 | 528 | |
1da177e4 LT |
529 | /* expiry */ |
530 | err = -EINVAL; | |
531 | exp.h.expiry_time = get_expiry(&mesg); | |
532 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 533 | goto out3; |
1da177e4 LT |
534 | |
535 | /* flags */ | |
536 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
537 | if (err == -ENOENT) { |
538 | err = 0; | |
1da177e4 | 539 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 540 | } else { |
c1a2a475 AV |
541 | if (err || an_int < 0) |
542 | goto out3; | |
1da177e4 LT |
543 | exp.ex_flags= an_int; |
544 | ||
545 | /* anon uid */ | |
546 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
547 | if (err) |
548 | goto out3; | |
1da177e4 LT |
549 | exp.ex_anon_uid= an_int; |
550 | ||
551 | /* anon gid */ | |
552 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
553 | if (err) |
554 | goto out3; | |
1da177e4 LT |
555 | exp.ex_anon_gid= an_int; |
556 | ||
557 | /* fsid */ | |
558 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
559 | if (err) |
560 | goto out3; | |
1da177e4 LT |
561 | exp.ex_fsid = an_int; |
562 | ||
af6a4e28 N |
563 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
564 | if (strcmp(buf, "fsloc") == 0) | |
565 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
566 | else if (strcmp(buf, "uuid") == 0) { | |
567 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
568 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
569 | if (len != 16) | |
570 | err = -EINVAL; | |
571 | else { | |
572 | exp.ex_uuid = | |
573 | kmemdup(buf, 16, GFP_KERNEL); | |
574 | if (exp.ex_uuid == NULL) | |
575 | err = -ENOMEM; | |
576 | } | |
e677bfe4 AA |
577 | } else if (strcmp(buf, "secinfo") == 0) |
578 | err = secinfo_parse(&mesg, buf, &exp); | |
579 | else | |
af6a4e28 N |
580 | /* quietly ignore unknown words and anything |
581 | * following. Newer user-space can try to set | |
582 | * new values, then see what the result was. | |
583 | */ | |
584 | break; | |
585 | if (err) | |
c1a2a475 | 586 | goto out4; |
af6a4e28 | 587 | } |
93346919 | 588 | |
774b1478 | 589 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 590 | exp.ex_uuid); |
c1a2a475 AV |
591 | if (err) |
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 MN |
617 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
618 | uid_t anonu, uid_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; | |
db3a3532 | 675 | new->cd = item->cd; |
1da177e4 LT |
676 | } |
677 | ||
4f7774c3 | 678 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 679 | { |
4f7774c3 N |
680 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
681 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 682 | int i; |
4f7774c3 | 683 | |
1da177e4 LT |
684 | new->ex_flags = item->ex_flags; |
685 | new->ex_anon_uid = item->ex_anon_uid; | |
686 | new->ex_anon_gid = item->ex_anon_gid; | |
687 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
688 | new->ex_uuid = item->ex_uuid; |
689 | item->ex_uuid = NULL; | |
93346919 MN |
690 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
691 | item->ex_fslocs.locations = NULL; | |
692 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
693 | item->ex_fslocs.locations_count = 0; | |
694 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
695 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
696 | new->ex_nflavors = item->ex_nflavors; |
697 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
698 | new->ex_flavors[i] = item->ex_flavors[i]; | |
699 | } | |
1da177e4 LT |
700 | } |
701 | ||
4f7774c3 N |
702 | static struct cache_head *svc_export_alloc(void) |
703 | { | |
704 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
705 | if (i) | |
706 | return &i->h; | |
707 | else | |
708 | return NULL; | |
709 | } | |
710 | ||
711 | struct cache_detail svc_export_cache = { | |
712 | .owner = THIS_MODULE, | |
713 | .hash_size = EXPORT_HASHMAX, | |
714 | .hash_table = export_table, | |
715 | .name = "nfsd.export", | |
716 | .cache_put = svc_export_put, | |
bc74b4f5 | 717 | .cache_upcall = svc_export_upcall, |
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 | |
55430e2e AV |
788 | static svc_export *exp_get_by_name(svc_client *clp, const struct path *path, |
789 | 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; |
db3a3532 | 799 | key.cd = &svc_export_cache; |
1da177e4 | 800 | |
4f7774c3 | 801 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
802 | if (exp == NULL) |
803 | return ERR_PTR(-ENOMEM); | |
804 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
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 | */ | |
5bf3bd2b | 813 | static struct svc_export *exp_parent(svc_client *clp, struct path *path) |
1da177e4 | 814 | { |
5bf3bd2b AV |
815 | struct dentry *saved = dget(path->dentry); |
816 | svc_export *exp = exp_get_by_name(clp, path, NULL); | |
817 | ||
818 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
819 | struct dentry *parent = dget_parent(path->dentry); | |
820 | dput(path->dentry); | |
821 | path->dentry = parent; | |
822 | exp = exp_get_by_name(clp, path, NULL); | |
1da177e4 | 823 | } |
5bf3bd2b AV |
824 | dput(path->dentry); |
825 | path->dentry = saved; | |
1da177e4 LT |
826 | return exp; |
827 | } | |
828 | ||
1da177e4 | 829 | |
1da177e4 LT |
830 | |
831 | /* | |
832 | * Obtain the root fh on behalf of a client. | |
833 | * This could be done in user space, but I feel that it adds some safety | |
834 | * since its harder to fool a kernel module than a user space program. | |
835 | */ | |
836 | int | |
a63bb996 | 837 | exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
838 | { |
839 | struct svc_export *exp; | |
a63bb996 | 840 | struct path path; |
1da177e4 LT |
841 | struct inode *inode; |
842 | struct svc_fh fh; | |
843 | int err; | |
844 | ||
845 | err = -EPERM; | |
846 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
847 | if (kern_path(name, 0, &path)) { |
848 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
849 | return err; |
850 | } | |
a63bb996 | 851 | inode = path.dentry->d_inode; |
1da177e4 LT |
852 | |
853 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 854 | name, path.dentry, clp->name, |
1da177e4 | 855 | inode->i_sb->s_id, inode->i_ino); |
5bf3bd2b | 856 | exp = exp_parent(clp, &path); |
4b41bd85 BF |
857 | if (IS_ERR(exp)) { |
858 | err = PTR_ERR(exp); | |
859 | goto out; | |
860 | } | |
1da177e4 LT |
861 | |
862 | /* | |
863 | * fh must be initialized before calling fh_compose | |
864 | */ | |
865 | fh_init(&fh, maxsize); | |
a63bb996 | 866 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
867 | err = -EINVAL; |
868 | else | |
869 | err = 0; | |
870 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
871 | fh_put(&fh); | |
872 | exp_put(exp); | |
873 | out: | |
a63bb996 | 874 | path_put(&path); |
1da177e4 LT |
875 | return err; |
876 | } | |
877 | ||
cce76f9b AB |
878 | static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type, |
879 | u32 *fsidv, struct cache_req *reqp) | |
eab7e2e6 N |
880 | { |
881 | struct svc_export *exp; | |
c89172e3 | 882 | struct svc_expkey *ek = exp_find_key(&svc_expkey_cache, clp, fsid_type, fsidv, reqp); |
2d3bb252 | 883 | if (IS_ERR(ek)) |
e231c2ee | 884 | return ERR_CAST(ek); |
eab7e2e6 | 885 | |
55430e2e | 886 | exp = exp_get_by_name(clp, &ek->ek_path, reqp); |
baab935f | 887 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 888 | |
2d3bb252 | 889 | if (IS_ERR(exp)) |
e231c2ee | 890 | return ERR_CAST(exp); |
eab7e2e6 N |
891 | return exp; |
892 | } | |
893 | ||
32c1eb0c AA |
894 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
895 | { | |
896 | struct exp_flavor_info *f; | |
897 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
898 | ||
899 | /* legacy gss-only clients are always OK: */ | |
900 | if (exp->ex_client == rqstp->rq_gssclient) | |
901 | return 0; | |
902 | /* ip-address based client; check sec= export option: */ | |
903 | for (f = exp->ex_flavors; f < end; f++) { | |
904 | if (f->pseudoflavor == rqstp->rq_flavor) | |
905 | return 0; | |
906 | } | |
907 | /* defaults in absence of sec= options: */ | |
908 | if (exp->ex_nflavors == 0) { | |
909 | if (rqstp->rq_flavor == RPC_AUTH_NULL || | |
910 | rqstp->rq_flavor == RPC_AUTH_UNIX) | |
911 | return 0; | |
912 | } | |
913 | return nfserr_wrongsec; | |
914 | } | |
915 | ||
0989a788 | 916 | /* |
2ea2209f BF |
917 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
918 | * auth_unix client) if it's available and has secinfo information; | |
919 | * otherwise, will try to use rq_gssclient. | |
920 | * | |
0989a788 BF |
921 | * Called from functions that handle requests; functions that do work on |
922 | * behalf of mountd are passed a single client name to use, and should | |
923 | * use exp_get_by_name() or exp_find(). | |
924 | */ | |
925 | struct svc_export * | |
91c9fa8f | 926 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 927 | { |
9a25b96c | 928 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
929 | |
930 | if (rqstp->rq_client == NULL) | |
931 | goto gss; | |
3ab4d8b1 | 932 | |
2ea2209f | 933 | /* First try the auth_unix client: */ |
91c9fa8f | 934 | exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
935 | if (PTR_ERR(exp) == -ENOENT) |
936 | goto gss; | |
937 | if (IS_ERR(exp)) | |
938 | return exp; | |
939 | /* If it has secinfo, assume there are no gss/... clients */ | |
940 | if (exp->ex_nflavors > 0) | |
941 | return exp; | |
942 | gss: | |
943 | /* Otherwise, try falling back on gss client */ | |
944 | if (rqstp->rq_gssclient == NULL) | |
945 | return exp; | |
91c9fa8f | 946 | gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
947 | if (PTR_ERR(gssexp) == -ENOENT) |
948 | return exp; | |
9a25b96c | 949 | if (!IS_ERR(exp)) |
2ea2209f BF |
950 | exp_put(exp); |
951 | return gssexp; | |
0989a788 BF |
952 | } |
953 | ||
954 | struct svc_export * | |
955 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
956 | { | |
9a25b96c | 957 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
2ea2209f BF |
958 | |
959 | if (rqstp->rq_client == NULL) | |
960 | goto gss; | |
3ab4d8b1 | 961 | |
2ea2209f BF |
962 | /* First try the auth_unix client: */ |
963 | exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle); | |
964 | if (PTR_ERR(exp) == -ENOENT) | |
965 | goto gss; | |
966 | if (IS_ERR(exp)) | |
967 | return exp; | |
968 | /* If it has secinfo, assume there are no gss/... clients */ | |
969 | if (exp->ex_nflavors > 0) | |
970 | return exp; | |
971 | gss: | |
972 | /* Otherwise, try falling back on gss client */ | |
973 | if (rqstp->rq_gssclient == NULL) | |
974 | return exp; | |
975 | gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv, | |
976 | &rqstp->rq_chandle); | |
977 | if (PTR_ERR(gssexp) == -ENOENT) | |
978 | return exp; | |
9a25b96c | 979 | if (!IS_ERR(exp)) |
2ea2209f BF |
980 | exp_put(exp); |
981 | return gssexp; | |
0989a788 BF |
982 | } |
983 | ||
984 | struct svc_export * | |
e64c390c | 985 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 986 | { |
e64c390c AV |
987 | struct dentry *saved = dget(path->dentry); |
988 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 989 | |
e64c390c AV |
990 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
991 | struct dentry *parent = dget_parent(path->dentry); | |
992 | dput(path->dentry); | |
993 | path->dentry = parent; | |
994 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 995 | } |
e64c390c AV |
996 | dput(path->dentry); |
997 | path->dentry = saved; | |
2ea2209f | 998 | return exp; |
0989a788 | 999 | } |
eab7e2e6 | 1000 | |
ed748aac | 1001 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1002 | { |
f39bde24 BF |
1003 | u32 fsidv[2]; |
1004 | ||
1005 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1006 | ||
260c64d2 | 1007 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1008 | } |
1009 | ||
1da177e4 LT |
1010 | /* |
1011 | * Called when we need the filehandle for the root of the pseudofs, | |
1012 | * for a given NFSv4 client. The root is defined to be the | |
1013 | * export point with fsid==0 | |
1014 | */ | |
c7afef1f | 1015 | __be32 |
df547efb | 1016 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1017 | { |
eab7e2e6 | 1018 | struct svc_export *exp; |
c7afef1f | 1019 | __be32 rv; |
1da177e4 | 1020 | |
ed748aac | 1021 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1022 | if (IS_ERR(exp)) |
1023 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1024 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1025 | exp_put(exp); |
1da177e4 LT |
1026 | return rv; |
1027 | } | |
1028 | ||
1029 | /* Iterator */ | |
1030 | ||
1031 | static void *e_start(struct seq_file *m, loff_t *pos) | |
f2c7ea10 | 1032 | __acquires(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 LT |
1033 | { |
1034 | loff_t n = *pos; | |
1035 | unsigned hash, export; | |
1036 | struct cache_head *ch; | |
f2c7ea10 | 1037 | struct cache_detail *cd = m->private; |
83e0ed70 | 1038 | struct cache_head **export_table = cd->hash_table; |
f2c7ea10 SK |
1039 | |
1040 | read_lock(&cd->hash_lock); | |
1da177e4 | 1041 | if (!n--) |
bc6f02e5 | 1042 | return SEQ_START_TOKEN; |
1da177e4 LT |
1043 | hash = n >> 32; |
1044 | export = n & ((1LL<<32) - 1); | |
1045 | ||
1046 | ||
1047 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1048 | if (!export--) | |
1049 | return ch; | |
1050 | n &= ~((1LL<<32) - 1); | |
1051 | do { | |
1052 | hash++; | |
1053 | n += 1LL<<32; | |
1054 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1055 | if (hash >= EXPORT_HASHMAX) | |
1056 | return NULL; | |
1057 | *pos = n+1; | |
1058 | return export_table[hash]; | |
1059 | } | |
1060 | ||
1061 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1062 | { | |
1063 | struct cache_head *ch = p; | |
1064 | int hash = (*pos >> 32); | |
83e0ed70 SK |
1065 | struct cache_detail *cd = m->private; |
1066 | struct cache_head **export_table = cd->hash_table; | |
1da177e4 | 1067 | |
bc6f02e5 | 1068 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1069 | hash = 0; |
1070 | else if (ch->next == NULL) { | |
1071 | hash++; | |
1072 | *pos += 1LL<<32; | |
1073 | } else { | |
1074 | ++*pos; | |
1075 | return ch->next; | |
1076 | } | |
1077 | *pos &= ~((1LL<<32) - 1); | |
1078 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1079 | hash++; | |
1080 | *pos += 1LL<<32; | |
1081 | } | |
1082 | if (hash >= EXPORT_HASHMAX) | |
1083 | return NULL; | |
1084 | ++*pos; | |
1085 | return export_table[hash]; | |
1086 | } | |
1087 | ||
1088 | static void e_stop(struct seq_file *m, void *p) | |
f2c7ea10 | 1089 | __releases(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 | 1090 | { |
f2c7ea10 SK |
1091 | struct cache_detail *cd = m->private; |
1092 | ||
1093 | read_unlock(&cd->hash_lock); | |
1da177e4 LT |
1094 | } |
1095 | ||
1096 | static struct flags { | |
1097 | int flag; | |
1098 | char *name[2]; | |
1099 | } expflags[] = { | |
1100 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1101 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1102 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1103 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1104 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1105 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1106 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1107 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1108 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1109 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1110 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1111 | { 0, {"", ""}} |
1112 | }; | |
1113 | ||
ac34cdb0 | 1114 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1115 | { |
1da177e4 | 1116 | struct flags *flg; |
ac34cdb0 | 1117 | int state, first = 0; |
1da177e4 LT |
1118 | |
1119 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1120 | if (flg->flag & ~mask) |
1121 | continue; | |
1122 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1123 | if (*flg->name[state]) |
1124 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1125 | } | |
ac34cdb0 BF |
1126 | } |
1127 | ||
91fe39d3 BF |
1128 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1129 | { | |
1130 | seq_printf(m, ","); | |
1131 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1132 | } | |
1133 | ||
74ec1e12 BF |
1134 | static bool secinfo_flags_equal(int f, int g) |
1135 | { | |
1136 | f &= NFSEXP_SECINFO_FLAGS; | |
1137 | g &= NFSEXP_SECINFO_FLAGS; | |
1138 | return f == g; | |
1139 | } | |
1140 | ||
1141 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1142 | { | |
1143 | int flags; | |
1144 | ||
1145 | flags = (*fp)->flags; | |
1146 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1147 | (*fp)++; | |
1148 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1149 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1150 | (*fp)++; | |
1151 | } | |
1152 | return flags; | |
1153 | } | |
1154 | ||
91fe39d3 BF |
1155 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1156 | { | |
1157 | struct exp_flavor_info *f; | |
1158 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1159 | int flags; |
91fe39d3 BF |
1160 | |
1161 | if (exp->ex_nflavors == 0) | |
1162 | return; | |
74ec1e12 BF |
1163 | f = exp->ex_flavors; |
1164 | flags = show_secinfo_run(m, &f, end); | |
1165 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1166 | show_secinfo_flags(m, flags); | |
1167 | while (f != end) { | |
1168 | flags = show_secinfo_run(m, &f, end); | |
1169 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1170 | } |
91fe39d3 BF |
1171 | } |
1172 | ||
ac34cdb0 BF |
1173 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1174 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1175 | { | |
1176 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1177 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1178 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1179 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1180 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1181 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1182 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1183 | if (fsloc && fsloc->locations_count > 0) { |
1184 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1185 | int i; | |
1186 | ||
ac34cdb0 | 1187 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1188 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1189 | seq_putc(m, '@'); | |
1190 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1191 | for (i = 1; i < fsloc->locations_count; i++) { | |
1192 | seq_putc(m, ';'); | |
1193 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1194 | seq_putc(m, '@'); | |
1195 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1196 | } | |
1197 | } | |
1da177e4 LT |
1198 | } |
1199 | ||
1200 | static int e_show(struct seq_file *m, void *p) | |
1201 | { | |
1202 | struct cache_head *cp = p; | |
1203 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1204 | struct cache_detail *cd = m->private; |
1da177e4 | 1205 | |
bc6f02e5 | 1206 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1207 | seq_puts(m, "# Version 1.1\n"); |
1208 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1209 | return 0; | |
1210 | } | |
1211 | ||
1da177e4 | 1212 | cache_get(&exp->h); |
f2c7ea10 | 1213 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1214 | return 0; |
a09581f2 | 1215 | exp_put(exp); |
f2c7ea10 | 1216 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1217 | } |
1218 | ||
88e9d34c | 1219 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1220 | .start = e_start, |
1221 | .next = e_next, | |
1222 | .stop = e_stop, | |
1223 | .show = e_show, | |
1224 | }; | |
1225 | ||
1da177e4 LT |
1226 | |
1227 | /* | |
1228 | * Initialize the exports module. | |
1229 | */ | |
dbf847ec | 1230 | int |
b89109be | 1231 | nfsd_export_init(struct net *net) |
1da177e4 | 1232 | { |
dbf847ec | 1233 | int rv; |
b89109be | 1234 | dprintk("nfsd: initializing export module (net: %p).\n", net); |
1da177e4 | 1235 | |
b89109be | 1236 | rv = cache_register_net(&svc_export_cache, net); |
dbf847ec BF |
1237 | if (rv) |
1238 | return rv; | |
b89109be | 1239 | rv = cache_register_net(&svc_expkey_cache, net); |
dbf847ec | 1240 | if (rv) |
b89109be | 1241 | cache_unregister_net(&svc_export_cache, net); |
dbf847ec | 1242 | return rv; |
1da177e4 LT |
1243 | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * Flush exports table - called when last nfsd thread is killed | |
1248 | */ | |
1249 | void | |
1250 | nfsd_export_flush(void) | |
1251 | { | |
1da177e4 LT |
1252 | cache_purge(&svc_expkey_cache); |
1253 | cache_purge(&svc_export_cache); | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * Shutdown the exports module. | |
1258 | */ | |
1259 | void | |
b89109be | 1260 | nfsd_export_shutdown(struct net *net) |
1da177e4 LT |
1261 | { |
1262 | ||
b89109be | 1263 | dprintk("nfsd: shutting down export module (net: %p).\n", net); |
1da177e4 | 1264 | |
b89109be SK |
1265 | cache_unregister_net(&svc_expkey_cache, net); |
1266 | cache_unregister_net(&svc_export_cache, net); | |
1da177e4 LT |
1267 | svcauth_unix_purge(); |
1268 | ||
b89109be | 1269 | dprintk("nfsd: export shutdown complete (net: %p).\n", net); |
1da177e4 | 1270 | } |