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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> |
b3853e0e | 18 | #include <linux/sunrpc/svc_xprt.h> |
1da177e4 | 19 | |
9a74af21 | 20 | #include "nfsd.h" |
1557aca7 | 21 | #include "nfsfh.h" |
b3853e0e | 22 | #include "netns.h" |
9cf514cc | 23 | #include "pnfs.h" |
9a74af21 | 24 | |
1da177e4 | 25 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 | 26 | |
1da177e4 LT |
27 | /* |
28 | * We have two caches. | |
29 | * One maps client+vfsmnt+dentry to export options - the export map | |
30 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
31 | * | |
32 | * The export options are actually stored in the first map, and the | |
33 | * second map contains a reference to the entry in the first map. | |
34 | */ | |
35 | ||
36 | #define EXPKEY_HASHBITS 8 | |
37 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
38 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
1da177e4 | 39 | |
74cae61a | 40 | static void expkey_put(struct kref *ref) |
1da177e4 | 41 | { |
baab935f N |
42 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
43 | ||
44 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
45 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
46 | path_put(&key->ek_path); | |
baab935f N |
47 | auth_domain_put(key->ek_client); |
48 | kfree(key); | |
1da177e4 LT |
49 | } |
50 | ||
51 | static void expkey_request(struct cache_detail *cd, | |
52 | struct cache_head *h, | |
53 | char **bpp, int *blen) | |
54 | { | |
55 | /* client fsidtype \xfsid */ | |
56 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
57 | char type[5]; | |
58 | ||
59 | qword_add(bpp, blen, ek->ek_client->name); | |
60 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
61 | qword_add(bpp, blen, type); | |
62 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
63 | (*bpp)[-1] = '\n'; | |
64 | } | |
65 | ||
c89172e3 SK |
66 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
67 | struct svc_expkey *old); | |
68 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 69 | |
1da177e4 LT |
70 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
71 | { | |
f0db79d5 | 72 | /* client fsidtype fsid expiry [path] */ |
1da177e4 LT |
73 | char *buf; |
74 | int len; | |
75 | struct auth_domain *dom = NULL; | |
76 | int err; | |
77 | int fsidtype; | |
78 | char *ep; | |
79 | struct svc_expkey key; | |
30bc4dfd | 80 | struct svc_expkey *ek = NULL; |
1da177e4 | 81 | |
3476964d | 82 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
83 | return -EINVAL; |
84 | mesg[mlen-1] = 0; | |
85 | ||
86 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
87 | err = -ENOMEM; | |
30bc4dfd BF |
88 | if (!buf) |
89 | goto out; | |
1da177e4 LT |
90 | |
91 | err = -EINVAL; | |
92 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
93 | goto out; | |
94 | ||
95 | err = -ENOENT; | |
96 | dom = auth_domain_find(buf); | |
97 | if (!dom) | |
98 | goto out; | |
99 | dprintk("found domain %s\n", buf); | |
100 | ||
101 | err = -EINVAL; | |
102 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
103 | goto out; | |
104 | fsidtype = simple_strtoul(buf, &ep, 10); | |
105 | if (*ep) | |
106 | goto out; | |
107 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 108 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
109 | goto out; |
110 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
111 | goto out; | |
112 | dprintk("found fsid length %d\n", len); | |
113 | if (len != key_len(fsidtype)) | |
114 | goto out; | |
115 | ||
116 | /* OK, we seem to have a valid key */ | |
117 | key.h.flags = 0; | |
118 | key.h.expiry_time = get_expiry(&mesg); | |
119 | if (key.h.expiry_time == 0) | |
120 | goto out; | |
121 | ||
122 | key.ek_client = dom; | |
123 | key.ek_fsidtype = fsidtype; | |
124 | memcpy(key.ek_fsid, buf, len); | |
125 | ||
c89172e3 | 126 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
127 | err = -ENOMEM; |
128 | if (!ek) | |
129 | goto out; | |
130 | ||
1da177e4 | 131 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 132 | err = -EINVAL; |
30bc4dfd BF |
133 | len = qword_get(&mesg, buf, PAGE_SIZE); |
134 | if (len < 0) | |
1da177e4 LT |
135 | goto out; |
136 | dprintk("Path seems to be <%s>\n", buf); | |
137 | err = 0; | |
138 | if (len == 0) { | |
1da177e4 | 139 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 140 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd BF |
141 | if (!ek) |
142 | err = -ENOMEM; | |
1da177e4 | 143 | } else { |
a63bb996 | 144 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 145 | if (err) |
1da177e4 LT |
146 | goto out; |
147 | ||
148 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 149 | |
c89172e3 | 150 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd | 151 | if (!ek) |
8d270f7f | 152 | err = -ENOMEM; |
a63bb996 | 153 | path_put(&key.ek_path); |
1da177e4 LT |
154 | } |
155 | cache_flush(); | |
156 | out: | |
30bc4dfd | 157 | if (ek) |
d4bb527e | 158 | cache_put(&ek->h, cd); |
1da177e4 LT |
159 | if (dom) |
160 | auth_domain_put(dom); | |
f99d49ad | 161 | kfree(buf); |
1da177e4 LT |
162 | return err; |
163 | } | |
164 | ||
165 | static int expkey_show(struct seq_file *m, | |
166 | struct cache_detail *cd, | |
167 | struct cache_head *h) | |
168 | { | |
169 | struct svc_expkey *ek ; | |
af6a4e28 | 170 | int i; |
1da177e4 LT |
171 | |
172 | if (h ==NULL) { | |
173 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
174 | return 0; | |
175 | } | |
176 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
177 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
178 | ek->ek_fsidtype); | |
179 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
180 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
181 | if (test_bit(CACHE_VALID, &h->flags) && |
182 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
183 | seq_printf(m, " "); | |
c32c2f63 | 184 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
185 | } |
186 | seq_printf(m, "\n"); | |
187 | return 0; | |
188 | } | |
1da177e4 | 189 | |
8d270f7f | 190 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 191 | { |
8d270f7f N |
192 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
193 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
194 | ||
195 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
196 | orig->ek_client != new->ek_client || | |
197 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
198 | return 0; |
199 | return 1; | |
200 | } | |
201 | ||
8d270f7f N |
202 | static inline void expkey_init(struct cache_head *cnew, |
203 | struct cache_head *citem) | |
1da177e4 | 204 | { |
8d270f7f N |
205 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
206 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
207 | ||
efc36aa5 | 208 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
209 | new->ek_client = item->ek_client; |
210 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
211 | |
212 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
213 | } |
214 | ||
8d270f7f N |
215 | static inline void expkey_update(struct cache_head *cnew, |
216 | struct cache_head *citem) | |
1da177e4 | 217 | { |
8d270f7f N |
218 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
219 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
220 | ||
e83aece3 JB |
221 | new->ek_path = item->ek_path; |
222 | path_get(&item->ek_path); | |
1da177e4 LT |
223 | } |
224 | ||
8d270f7f N |
225 | static struct cache_head *expkey_alloc(void) |
226 | { | |
227 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
228 | if (i) | |
229 | return &i->h; | |
230 | else | |
231 | return NULL; | |
232 | } | |
233 | ||
e5f06f72 | 234 | static struct cache_detail svc_expkey_cache_template = { |
8d270f7f N |
235 | .owner = THIS_MODULE, |
236 | .hash_size = EXPKEY_HASHMAX, | |
8d270f7f N |
237 | .name = "nfsd.fh", |
238 | .cache_put = expkey_put, | |
73fb847a | 239 | .cache_request = expkey_request, |
8d270f7f N |
240 | .cache_parse = expkey_parse, |
241 | .cache_show = expkey_show, | |
242 | .match = expkey_match, | |
243 | .init = expkey_init, | |
244 | .update = expkey_update, | |
245 | .alloc = expkey_alloc, | |
246 | }; | |
247 | ||
61f8603d N |
248 | static int |
249 | svc_expkey_hash(struct svc_expkey *item) | |
8d270f7f | 250 | { |
8d270f7f N |
251 | int hash = item->ek_fsidtype; |
252 | char * cp = (char*)item->ek_fsid; | |
253 | int len = key_len(item->ek_fsidtype); | |
254 | ||
255 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
256 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
257 | hash &= EXPKEY_HASHMASK; | |
61f8603d N |
258 | return hash; |
259 | } | |
260 | ||
261 | static struct svc_expkey * | |
c89172e3 | 262 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
61f8603d N |
263 | { |
264 | struct cache_head *ch; | |
265 | int hash = svc_expkey_hash(item); | |
8d270f7f | 266 | |
c89172e3 | 267 | ch = sunrpc_cache_lookup(cd, &item->h, hash); |
8d270f7f N |
268 | if (ch) |
269 | return container_of(ch, struct svc_expkey, h); | |
270 | else | |
271 | return NULL; | |
272 | } | |
273 | ||
274 | static struct svc_expkey * | |
c89172e3 SK |
275 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
276 | struct svc_expkey *old) | |
8d270f7f N |
277 | { |
278 | struct cache_head *ch; | |
61f8603d | 279 | int hash = svc_expkey_hash(new); |
8d270f7f | 280 | |
c89172e3 | 281 | ch = sunrpc_cache_update(cd, &new->h, &old->h, hash); |
8d270f7f N |
282 | if (ch) |
283 | return container_of(ch, struct svc_expkey, h); | |
284 | else | |
285 | return NULL; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | |
289 | #define EXPORT_HASHBITS 8 | |
290 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
1da177e4 | 291 | |
93346919 MN |
292 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
293 | { | |
a1f05514 | 294 | struct nfsd4_fs_location *locations = fsloc->locations; |
93346919 MN |
295 | int i; |
296 | ||
a1f05514 KM |
297 | if (!locations) |
298 | return; | |
299 | ||
93346919 | 300 | for (i = 0; i < fsloc->locations_count; i++) { |
a1f05514 KM |
301 | kfree(locations[i].path); |
302 | kfree(locations[i].hosts); | |
93346919 | 303 | } |
a1f05514 KM |
304 | |
305 | kfree(locations); | |
306 | fsloc->locations = NULL; | |
93346919 MN |
307 | } |
308 | ||
baab935f | 309 | static void svc_export_put(struct kref *ref) |
1da177e4 | 310 | { |
baab935f | 311 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 312 | path_put(&exp->ex_path); |
baab935f | 313 | auth_domain_put(exp->ex_client); |
93346919 | 314 | nfsd4_fslocs_free(&exp->ex_fslocs); |
885c91f7 | 315 | kfree(exp->ex_uuid); |
baab935f | 316 | kfree(exp); |
1da177e4 LT |
317 | } |
318 | ||
319 | static void svc_export_request(struct cache_detail *cd, | |
320 | struct cache_head *h, | |
321 | char **bpp, int *blen) | |
322 | { | |
323 | /* client path */ | |
324 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
325 | char *pth; | |
326 | ||
327 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 328 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
329 | if (IS_ERR(pth)) { |
330 | /* is this correct? */ | |
331 | (*bpp)[0] = '\n'; | |
332 | return; | |
333 | } | |
334 | qword_add(bpp, blen, pth); | |
335 | (*bpp)[-1] = '\n'; | |
336 | } | |
337 | ||
74cae61a AB |
338 | static struct svc_export *svc_export_update(struct svc_export *new, |
339 | struct svc_export *old); | |
4f7774c3 | 340 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 341 | |
774b1478 | 342 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
343 | { |
344 | ||
f2ca7153 BF |
345 | /* |
346 | * We currently export only dirs, regular files, and (for v4 | |
347 | * pseudoroot) symlinks. | |
1da177e4 LT |
348 | */ |
349 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 350 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
351 | !S_ISREG(inode->i_mode)) |
352 | return -ENOTDIR; | |
353 | ||
774b1478 BF |
354 | /* |
355 | * Mountd should never pass down a writeable V4ROOT export, but, | |
356 | * just to make sure: | |
357 | */ | |
358 | if (*flags & NFSEXP_V4ROOT) | |
359 | *flags |= NFSEXP_READONLY; | |
360 | ||
1da177e4 LT |
361 | /* There are two requirements on a filesystem to be exportable. |
362 | * 1: We must be able to identify the filesystem from a number. | |
363 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 364 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
365 | * 2: We must be able to find an inode from a filehandle. |
366 | * This means that s_export_op must be set. | |
367 | */ | |
368 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 369 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 370 | uuid == NULL) { |
3e3b4800 | 371 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
372 | return -EINVAL; |
373 | } | |
cfaea787 CH |
374 | |
375 | if (!inode->i_sb->s_export_op || | |
376 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
377 | dprintk("exp_export: export of invalid fs type.\n"); |
378 | return -EINVAL; | |
379 | } | |
380 | ||
1da177e4 LT |
381 | return 0; |
382 | ||
383 | } | |
384 | ||
93346919 MN |
385 | #ifdef CONFIG_NFSD_V4 |
386 | ||
387 | static int | |
388 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
389 | { | |
390 | int len; | |
391 | int migrated, i, err; | |
392 | ||
be69da80 KM |
393 | /* more than one fsloc */ |
394 | if (fsloc->locations) | |
395 | return -EINVAL; | |
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 | { | |
e677bfe4 | 446 | struct exp_flavor_info *f; |
1f53146d KM |
447 | u32 listsize; |
448 | int err; | |
e677bfe4 | 449 | |
be69da80 KM |
450 | /* more than one secinfo */ |
451 | if (exp->ex_nflavors) | |
452 | return -EINVAL; | |
453 | ||
1f53146d | 454 | err = get_uint(mesg, &listsize); |
e677bfe4 AA |
455 | if (err) |
456 | return err; | |
1f53146d | 457 | if (listsize > MAX_SECINFO_LIST) |
e677bfe4 AA |
458 | return -EINVAL; |
459 | ||
460 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
a007c4c3 | 461 | err = get_uint(mesg, &f->pseudoflavor); |
e677bfe4 AA |
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 | */ |
a007c4c3 | 470 | err = get_uint(mesg, &f->flags); |
e677bfe4 AA |
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 | ||
0d63790c KM |
488 | static inline int |
489 | uuid_parse(char **mesg, char *buf, unsigned char **puuid) | |
490 | { | |
491 | int len; | |
492 | ||
be69da80 KM |
493 | /* more than one uuid */ |
494 | if (*puuid) | |
495 | return -EINVAL; | |
496 | ||
0d63790c KM |
497 | /* expect a 16 byte uuid encoded as \xXXXX... */ |
498 | len = qword_get(mesg, buf, PAGE_SIZE); | |
94eb3689 | 499 | if (len != EX_UUID_LEN) |
0d63790c KM |
500 | return -EINVAL; |
501 | ||
94eb3689 | 502 | *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL); |
0d63790c KM |
503 | if (*puuid == NULL) |
504 | return -ENOMEM; | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
1da177e4 LT |
509 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
510 | { | |
511 | /* client path expiry [flags anonuid anongid fsid] */ | |
512 | char *buf; | |
513 | int len; | |
514 | int err; | |
515 | struct auth_domain *dom = NULL; | |
c1a2a475 | 516 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
517 | int an_int; |
518 | ||
1da177e4 LT |
519 | if (mesg[mlen-1] != '\n') |
520 | return -EINVAL; | |
521 | mesg[mlen-1] = 0; | |
522 | ||
523 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
524 | if (!buf) |
525 | return -ENOMEM; | |
1da177e4 LT |
526 | |
527 | /* client */ | |
1da177e4 | 528 | err = -EINVAL; |
c1a2a475 AV |
529 | len = qword_get(&mesg, buf, PAGE_SIZE); |
530 | if (len <= 0) | |
531 | goto out; | |
1da177e4 LT |
532 | |
533 | err = -ENOENT; | |
534 | dom = auth_domain_find(buf); | |
535 | if (!dom) | |
536 | goto out; | |
537 | ||
538 | /* path */ | |
539 | err = -EINVAL; | |
c1a2a475 AV |
540 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
541 | goto out1; | |
542 | ||
543 | err = kern_path(buf, 0, &exp.ex_path); | |
544 | if (err) | |
545 | goto out1; | |
1da177e4 | 546 | |
1da177e4 | 547 | exp.ex_client = dom; |
db3a3532 | 548 | exp.cd = cd; |
9cf514cc | 549 | exp.ex_devid_map = NULL; |
c1a2a475 | 550 | |
1da177e4 LT |
551 | /* expiry */ |
552 | err = -EINVAL; | |
553 | exp.h.expiry_time = get_expiry(&mesg); | |
554 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 555 | goto out3; |
1da177e4 LT |
556 | |
557 | /* flags */ | |
558 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
559 | if (err == -ENOENT) { |
560 | err = 0; | |
1da177e4 | 561 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 562 | } else { |
c1a2a475 AV |
563 | if (err || an_int < 0) |
564 | goto out3; | |
1da177e4 LT |
565 | exp.ex_flags= an_int; |
566 | ||
567 | /* anon uid */ | |
568 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
569 | if (err) |
570 | goto out3; | |
4c1e1b34 | 571 | exp.ex_anon_uid= make_kuid(&init_user_ns, an_int); |
1da177e4 LT |
572 | |
573 | /* anon gid */ | |
574 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
575 | if (err) |
576 | goto out3; | |
4c1e1b34 | 577 | exp.ex_anon_gid= make_kgid(&init_user_ns, an_int); |
1da177e4 LT |
578 | |
579 | /* fsid */ | |
580 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
581 | if (err) |
582 | goto out3; | |
1da177e4 LT |
583 | exp.ex_fsid = an_int; |
584 | ||
af6a4e28 N |
585 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
586 | if (strcmp(buf, "fsloc") == 0) | |
587 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
0d63790c KM |
588 | else if (strcmp(buf, "uuid") == 0) |
589 | err = uuid_parse(&mesg, buf, &exp.ex_uuid); | |
590 | else if (strcmp(buf, "secinfo") == 0) | |
e677bfe4 AA |
591 | err = secinfo_parse(&mesg, buf, &exp); |
592 | else | |
af6a4e28 N |
593 | /* quietly ignore unknown words and anything |
594 | * following. Newer user-space can try to set | |
595 | * new values, then see what the result was. | |
596 | */ | |
597 | break; | |
598 | if (err) | |
c1a2a475 | 599 | goto out4; |
af6a4e28 | 600 | } |
93346919 | 601 | |
774b1478 | 602 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 603 | exp.ex_uuid); |
c1a2a475 AV |
604 | if (err) |
605 | goto out4; | |
6f6cc320 BF |
606 | /* |
607 | * No point caching this if it would immediately expire. | |
608 | * Also, this protects exportfs's dummy export from the | |
609 | * anon_uid/anon_gid checks: | |
610 | */ | |
611 | if (exp.h.expiry_time < seconds_since_boot()) | |
612 | goto out4; | |
427d6c66 BF |
613 | /* |
614 | * For some reason exportfs has been passing down an | |
615 | * invalid (-1) uid & gid on the "dummy" export which it | |
616 | * uses to test export support. To make sure exportfs | |
617 | * sees errors from check_export we therefore need to | |
618 | * delay these checks till after check_export: | |
619 | */ | |
6f6cc320 | 620 | err = -EINVAL; |
427d6c66 BF |
621 | if (!uid_valid(exp.ex_anon_uid)) |
622 | goto out4; | |
623 | if (!gid_valid(exp.ex_anon_gid)) | |
624 | goto out4; | |
6f6cc320 | 625 | err = 0; |
9cf514cc CH |
626 | |
627 | nfsd4_setup_layout_type(&exp); | |
1da177e4 LT |
628 | } |
629 | ||
4f7774c3 | 630 | expp = svc_export_lookup(&exp); |
1da177e4 | 631 | if (expp) |
4f7774c3 N |
632 | expp = svc_export_update(&exp, expp); |
633 | else | |
634 | err = -ENOMEM; | |
1da177e4 | 635 | cache_flush(); |
4f7774c3 N |
636 | if (expp == NULL) |
637 | err = -ENOMEM; | |
638 | else | |
639 | exp_put(expp); | |
c1a2a475 | 640 | out4: |
af6a4e28 N |
641 | nfsd4_fslocs_free(&exp.ex_fslocs); |
642 | kfree(exp.ex_uuid); | |
c1a2a475 | 643 | out3: |
c1a2a475 AV |
644 | path_put(&exp.ex_path); |
645 | out1: | |
646 | auth_domain_put(dom); | |
647 | out: | |
f99d49ad | 648 | kfree(buf); |
1da177e4 LT |
649 | return err; |
650 | } | |
651 | ||
93346919 | 652 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 653 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
91fe39d3 | 654 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
655 | |
656 | static int svc_export_show(struct seq_file *m, | |
657 | struct cache_detail *cd, | |
658 | struct cache_head *h) | |
659 | { | |
660 | struct svc_export *exp ; | |
661 | ||
662 | if (h ==NULL) { | |
663 | seq_puts(m, "#path domain(flags)\n"); | |
664 | return 0; | |
665 | } | |
666 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 667 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
668 | seq_putc(m, '\t'); |
669 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
670 | seq_putc(m, '('); | |
671 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 672 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
673 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
674 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
675 | if (exp->ex_uuid) { |
676 | int i; | |
677 | seq_puts(m, ",uuid="); | |
94eb3689 | 678 | for (i = 0; i < EX_UUID_LEN; i++) { |
af6a4e28 N |
679 | if ((i&3) == 0 && i) |
680 | seq_putc(m, ':'); | |
681 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
682 | } | |
683 | } | |
91fe39d3 | 684 | show_secinfo(m, exp); |
af6a4e28 | 685 | } |
1da177e4 LT |
686 | seq_puts(m, ")\n"); |
687 | return 0; | |
688 | } | |
4f7774c3 | 689 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 690 | { |
4f7774c3 N |
691 | struct svc_export *orig = container_of(a, struct svc_export, h); |
692 | struct svc_export *new = container_of(b, struct svc_export, h); | |
693 | return orig->ex_client == new->ex_client && | |
54775491 JB |
694 | orig->ex_path.dentry == new->ex_path.dentry && |
695 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 696 | } |
4f7774c3 N |
697 | |
698 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 699 | { |
4f7774c3 N |
700 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
701 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
702 | ||
efc36aa5 | 703 | kref_get(&item->ex_client->ref); |
1da177e4 | 704 | new->ex_client = item->ex_client; |
0da22a91 KM |
705 | new->ex_path = item->ex_path; |
706 | path_get(&item->ex_path); | |
93346919 MN |
707 | new->ex_fslocs.locations = NULL; |
708 | new->ex_fslocs.locations_count = 0; | |
709 | new->ex_fslocs.migrated = 0; | |
9cf514cc | 710 | new->ex_layout_type = 0; |
2eeb9b2a | 711 | new->ex_uuid = NULL; |
db3a3532 | 712 | new->cd = item->cd; |
1da177e4 LT |
713 | } |
714 | ||
4f7774c3 | 715 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 716 | { |
4f7774c3 N |
717 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
718 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 719 | int i; |
4f7774c3 | 720 | |
1da177e4 LT |
721 | new->ex_flags = item->ex_flags; |
722 | new->ex_anon_uid = item->ex_anon_uid; | |
723 | new->ex_anon_gid = item->ex_anon_gid; | |
724 | new->ex_fsid = item->ex_fsid; | |
9cf514cc CH |
725 | new->ex_devid_map = item->ex_devid_map; |
726 | item->ex_devid_map = NULL; | |
af6a4e28 N |
727 | new->ex_uuid = item->ex_uuid; |
728 | item->ex_uuid = NULL; | |
93346919 MN |
729 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
730 | item->ex_fslocs.locations = NULL; | |
731 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
732 | item->ex_fslocs.locations_count = 0; | |
733 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
734 | item->ex_fslocs.migrated = 0; | |
9cf514cc | 735 | new->ex_layout_type = item->ex_layout_type; |
e677bfe4 AA |
736 | new->ex_nflavors = item->ex_nflavors; |
737 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
738 | new->ex_flavors[i] = item->ex_flavors[i]; | |
739 | } | |
1da177e4 LT |
740 | } |
741 | ||
4f7774c3 N |
742 | static struct cache_head *svc_export_alloc(void) |
743 | { | |
744 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
745 | if (i) | |
746 | return &i->h; | |
747 | else | |
748 | return NULL; | |
749 | } | |
750 | ||
2355c596 | 751 | static struct cache_detail svc_export_cache_template = { |
4f7774c3 N |
752 | .owner = THIS_MODULE, |
753 | .hash_size = EXPORT_HASHMAX, | |
4f7774c3 N |
754 | .name = "nfsd.export", |
755 | .cache_put = svc_export_put, | |
73fb847a | 756 | .cache_request = svc_export_request, |
4f7774c3 N |
757 | .cache_parse = svc_export_parse, |
758 | .cache_show = svc_export_show, | |
759 | .match = svc_export_match, | |
760 | .init = svc_export_init, | |
761 | .update = export_update, | |
762 | .alloc = svc_export_alloc, | |
763 | }; | |
764 | ||
61f8603d N |
765 | static int |
766 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 767 | { |
4f7774c3 | 768 | int hash; |
61f8603d | 769 | |
4f7774c3 | 770 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
771 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
772 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
773 | return hash; |
774 | } | |
775 | ||
776 | static struct svc_export * | |
777 | svc_export_lookup(struct svc_export *exp) | |
778 | { | |
779 | struct cache_head *ch; | |
780 | int hash = svc_export_hash(exp); | |
4f7774c3 | 781 | |
db3a3532 | 782 | ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash); |
4f7774c3 N |
783 | if (ch) |
784 | return container_of(ch, struct svc_export, h); | |
785 | else | |
786 | return NULL; | |
787 | } | |
788 | ||
74cae61a | 789 | static struct svc_export * |
4f7774c3 N |
790 | svc_export_update(struct svc_export *new, struct svc_export *old) |
791 | { | |
792 | struct cache_head *ch; | |
61f8603d | 793 | int hash = svc_export_hash(old); |
4f7774c3 | 794 | |
db3a3532 | 795 | ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
4f7774c3 N |
796 | if (ch) |
797 | return container_of(ch, struct svc_export, h); | |
798 | else | |
799 | return NULL; | |
800 | } | |
1da177e4 LT |
801 | |
802 | ||
74cae61a | 803 | static struct svc_expkey * |
e6d615f7 | 804 | exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type, |
c89172e3 | 805 | u32 *fsidv, struct cache_req *reqp) |
1da177e4 LT |
806 | { |
807 | struct svc_expkey key, *ek; | |
808 | int err; | |
809 | ||
810 | if (!clp) | |
2d3bb252 | 811 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
812 | |
813 | key.ek_client = clp; | |
814 | key.ek_fsidtype = fsid_type; | |
815 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
816 | ||
c89172e3 | 817 | ek = svc_expkey_lookup(cd, &key); |
2d3bb252 BF |
818 | if (ek == NULL) |
819 | return ERR_PTR(-ENOMEM); | |
c89172e3 | 820 | err = cache_check(cd, &ek->h, reqp); |
2d3bb252 BF |
821 | if (err) |
822 | return ERR_PTR(err); | |
1da177e4 LT |
823 | return ek; |
824 | } | |
825 | ||
e6d615f7 KM |
826 | static struct svc_export * |
827 | exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp, | |
828 | const struct path *path, struct cache_req *reqp) | |
1da177e4 LT |
829 | { |
830 | struct svc_export *exp, key; | |
2d3bb252 | 831 | int err; |
e83aece3 | 832 | |
1da177e4 | 833 | if (!clp) |
2d3bb252 | 834 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
835 | |
836 | key.ex_client = clp; | |
55430e2e | 837 | key.ex_path = *path; |
2a75cfa6 | 838 | key.cd = cd; |
1da177e4 | 839 | |
4f7774c3 | 840 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
841 | if (exp == NULL) |
842 | return ERR_PTR(-ENOMEM); | |
2a75cfa6 | 843 | err = cache_check(cd, &exp->h, reqp); |
2d3bb252 BF |
844 | if (err) |
845 | return ERR_PTR(err); | |
1da177e4 LT |
846 | return exp; |
847 | } | |
848 | ||
849 | /* | |
850 | * Find the export entry for a given dentry. | |
851 | */ | |
e6d615f7 KM |
852 | static struct svc_export * |
853 | exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path) | |
1da177e4 | 854 | { |
5bf3bd2b | 855 | struct dentry *saved = dget(path->dentry); |
e6d615f7 | 856 | struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
5bf3bd2b AV |
857 | |
858 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
859 | struct dentry *parent = dget_parent(path->dentry); | |
860 | dput(path->dentry); | |
861 | path->dentry = parent; | |
2a75cfa6 | 862 | exp = exp_get_by_name(cd, clp, path, NULL); |
1da177e4 | 863 | } |
5bf3bd2b AV |
864 | dput(path->dentry); |
865 | path->dentry = saved; | |
1da177e4 LT |
866 | return exp; |
867 | } | |
868 | ||
1da177e4 | 869 | |
1da177e4 LT |
870 | |
871 | /* | |
872 | * Obtain the root fh on behalf of a client. | |
873 | * This could be done in user space, but I feel that it adds some safety | |
874 | * since its harder to fool a kernel module than a user space program. | |
875 | */ | |
876 | int | |
e6d615f7 | 877 | exp_rootfh(struct net *net, struct auth_domain *clp, char *name, |
2a75cfa6 | 878 | struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
879 | { |
880 | struct svc_export *exp; | |
a63bb996 | 881 | struct path path; |
1da177e4 LT |
882 | struct inode *inode; |
883 | struct svc_fh fh; | |
884 | int err; | |
b3853e0e SK |
885 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
886 | struct cache_detail *cd = nn->svc_export_cache; | |
1da177e4 LT |
887 | |
888 | err = -EPERM; | |
889 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
890 | if (kern_path(name, 0, &path)) { |
891 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
892 | return err; |
893 | } | |
a63bb996 | 894 | inode = path.dentry->d_inode; |
1da177e4 LT |
895 | |
896 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 897 | name, path.dentry, clp->name, |
1da177e4 | 898 | inode->i_sb->s_id, inode->i_ino); |
2a75cfa6 | 899 | exp = exp_parent(cd, clp, &path); |
4b41bd85 BF |
900 | if (IS_ERR(exp)) { |
901 | err = PTR_ERR(exp); | |
902 | goto out; | |
903 | } | |
1da177e4 LT |
904 | |
905 | /* | |
906 | * fh must be initialized before calling fh_compose | |
907 | */ | |
908 | fh_init(&fh, maxsize); | |
a63bb996 | 909 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
910 | err = -EINVAL; |
911 | else | |
912 | err = 0; | |
913 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
914 | fh_put(&fh); | |
915 | exp_put(exp); | |
916 | out: | |
a63bb996 | 917 | path_put(&path); |
1da177e4 LT |
918 | return err; |
919 | } | |
920 | ||
2a75cfa6 SK |
921 | static struct svc_export *exp_find(struct cache_detail *cd, |
922 | struct auth_domain *clp, int fsid_type, | |
cce76f9b | 923 | u32 *fsidv, struct cache_req *reqp) |
eab7e2e6 N |
924 | { |
925 | struct svc_export *exp; | |
e5f06f72 SK |
926 | struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
927 | struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 928 | if (IS_ERR(ek)) |
e231c2ee | 929 | return ERR_CAST(ek); |
eab7e2e6 | 930 | |
2a75cfa6 | 931 | exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
e5f06f72 | 932 | cache_put(&ek->h, nn->svc_expkey_cache); |
eab7e2e6 | 933 | |
2d3bb252 | 934 | if (IS_ERR(exp)) |
e231c2ee | 935 | return ERR_CAST(exp); |
eab7e2e6 N |
936 | return exp; |
937 | } | |
938 | ||
32c1eb0c AA |
939 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
940 | { | |
941 | struct exp_flavor_info *f; | |
942 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
943 | ||
944 | /* legacy gss-only clients are always OK: */ | |
945 | if (exp->ex_client == rqstp->rq_gssclient) | |
946 | return 0; | |
947 | /* ip-address based client; check sec= export option: */ | |
948 | for (f = exp->ex_flavors; f < end; f++) { | |
d5497fc6 | 949 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
32c1eb0c AA |
950 | return 0; |
951 | } | |
952 | /* defaults in absence of sec= options: */ | |
953 | if (exp->ex_nflavors == 0) { | |
d5497fc6 BF |
954 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
955 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) | |
32c1eb0c AA |
956 | return 0; |
957 | } | |
958 | return nfserr_wrongsec; | |
959 | } | |
960 | ||
0989a788 | 961 | /* |
2ea2209f BF |
962 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
963 | * auth_unix client) if it's available and has secinfo information; | |
964 | * otherwise, will try to use rq_gssclient. | |
965 | * | |
0989a788 BF |
966 | * Called from functions that handle requests; functions that do work on |
967 | * behalf of mountd are passed a single client name to use, and should | |
968 | * use exp_get_by_name() or exp_find(). | |
969 | */ | |
970 | struct svc_export * | |
91c9fa8f | 971 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 972 | { |
9a25b96c | 973 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 974 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 975 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
976 | |
977 | if (rqstp->rq_client == NULL) | |
978 | goto gss; | |
3ab4d8b1 | 979 | |
2ea2209f | 980 | /* First try the auth_unix client: */ |
2a75cfa6 | 981 | exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
982 | if (PTR_ERR(exp) == -ENOENT) |
983 | goto gss; | |
984 | if (IS_ERR(exp)) | |
985 | return exp; | |
986 | /* If it has secinfo, assume there are no gss/... clients */ | |
987 | if (exp->ex_nflavors > 0) | |
988 | return exp; | |
989 | gss: | |
990 | /* Otherwise, try falling back on gss client */ | |
991 | if (rqstp->rq_gssclient == NULL) | |
992 | return exp; | |
2a75cfa6 | 993 | gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
994 | if (PTR_ERR(gssexp) == -ENOENT) |
995 | return exp; | |
9a25b96c | 996 | if (!IS_ERR(exp)) |
2ea2209f BF |
997 | exp_put(exp); |
998 | return gssexp; | |
0989a788 BF |
999 | } |
1000 | ||
1001 | struct svc_export * | |
1002 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
1003 | { | |
9a25b96c | 1004 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 1005 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 1006 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
1007 | |
1008 | if (rqstp->rq_client == NULL) | |
1009 | goto gss; | |
3ab4d8b1 | 1010 | |
2ea2209f | 1011 | /* First try the auth_unix client: */ |
2a75cfa6 SK |
1012 | exp = exp_find(cd, rqstp->rq_client, fsid_type, |
1013 | fsidv, &rqstp->rq_chandle); | |
2ea2209f BF |
1014 | if (PTR_ERR(exp) == -ENOENT) |
1015 | goto gss; | |
1016 | if (IS_ERR(exp)) | |
1017 | return exp; | |
1018 | /* If it has secinfo, assume there are no gss/... clients */ | |
1019 | if (exp->ex_nflavors > 0) | |
1020 | return exp; | |
1021 | gss: | |
1022 | /* Otherwise, try falling back on gss client */ | |
1023 | if (rqstp->rq_gssclient == NULL) | |
1024 | return exp; | |
2a75cfa6 | 1025 | gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
2ea2209f BF |
1026 | &rqstp->rq_chandle); |
1027 | if (PTR_ERR(gssexp) == -ENOENT) | |
1028 | return exp; | |
9a25b96c | 1029 | if (!IS_ERR(exp)) |
2ea2209f BF |
1030 | exp_put(exp); |
1031 | return gssexp; | |
0989a788 BF |
1032 | } |
1033 | ||
1034 | struct svc_export * | |
e64c390c | 1035 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 1036 | { |
e64c390c AV |
1037 | struct dentry *saved = dget(path->dentry); |
1038 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1039 | |
e64c390c AV |
1040 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1041 | struct dentry *parent = dget_parent(path->dentry); | |
1042 | dput(path->dentry); | |
1043 | path->dentry = parent; | |
1044 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1045 | } |
e64c390c AV |
1046 | dput(path->dentry); |
1047 | path->dentry = saved; | |
2ea2209f | 1048 | return exp; |
0989a788 | 1049 | } |
eab7e2e6 | 1050 | |
ed748aac | 1051 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1052 | { |
f39bde24 BF |
1053 | u32 fsidv[2]; |
1054 | ||
1055 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1056 | ||
260c64d2 | 1057 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1058 | } |
1059 | ||
1da177e4 LT |
1060 | /* |
1061 | * Called when we need the filehandle for the root of the pseudofs, | |
1062 | * for a given NFSv4 client. The root is defined to be the | |
1063 | * export point with fsid==0 | |
1064 | */ | |
c7afef1f | 1065 | __be32 |
df547efb | 1066 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1067 | { |
eab7e2e6 | 1068 | struct svc_export *exp; |
c7afef1f | 1069 | __be32 rv; |
1da177e4 | 1070 | |
ed748aac | 1071 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1072 | if (IS_ERR(exp)) |
1073 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1074 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1075 | exp_put(exp); |
1da177e4 LT |
1076 | return rv; |
1077 | } | |
1078 | ||
1079 | /* Iterator */ | |
1080 | ||
1081 | static void *e_start(struct seq_file *m, loff_t *pos) | |
f2c7ea10 | 1082 | __acquires(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 LT |
1083 | { |
1084 | loff_t n = *pos; | |
1085 | unsigned hash, export; | |
1086 | struct cache_head *ch; | |
f2c7ea10 | 1087 | struct cache_detail *cd = m->private; |
83e0ed70 | 1088 | struct cache_head **export_table = cd->hash_table; |
f2c7ea10 SK |
1089 | |
1090 | read_lock(&cd->hash_lock); | |
1da177e4 | 1091 | if (!n--) |
bc6f02e5 | 1092 | return SEQ_START_TOKEN; |
1da177e4 LT |
1093 | hash = n >> 32; |
1094 | export = n & ((1LL<<32) - 1); | |
1095 | ||
1096 | ||
1097 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1098 | if (!export--) | |
1099 | return ch; | |
1100 | n &= ~((1LL<<32) - 1); | |
1101 | do { | |
1102 | hash++; | |
1103 | n += 1LL<<32; | |
1104 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1105 | if (hash >= EXPORT_HASHMAX) | |
1106 | return NULL; | |
1107 | *pos = n+1; | |
1108 | return export_table[hash]; | |
1109 | } | |
1110 | ||
1111 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1112 | { | |
1113 | struct cache_head *ch = p; | |
1114 | int hash = (*pos >> 32); | |
83e0ed70 SK |
1115 | struct cache_detail *cd = m->private; |
1116 | struct cache_head **export_table = cd->hash_table; | |
1da177e4 | 1117 | |
bc6f02e5 | 1118 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1119 | hash = 0; |
1120 | else if (ch->next == NULL) { | |
1121 | hash++; | |
1122 | *pos += 1LL<<32; | |
1123 | } else { | |
1124 | ++*pos; | |
1125 | return ch->next; | |
1126 | } | |
1127 | *pos &= ~((1LL<<32) - 1); | |
1128 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1129 | hash++; | |
1130 | *pos += 1LL<<32; | |
1131 | } | |
1132 | if (hash >= EXPORT_HASHMAX) | |
1133 | return NULL; | |
1134 | ++*pos; | |
1135 | return export_table[hash]; | |
1136 | } | |
1137 | ||
1138 | static void e_stop(struct seq_file *m, void *p) | |
f2c7ea10 | 1139 | __releases(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 | 1140 | { |
f2c7ea10 SK |
1141 | struct cache_detail *cd = m->private; |
1142 | ||
1143 | read_unlock(&cd->hash_lock); | |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | static struct flags { | |
1147 | int flag; | |
1148 | char *name[2]; | |
1149 | } expflags[] = { | |
1150 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1151 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1152 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1153 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1154 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1155 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
18c01ab3 | 1156 | { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}}, |
1da177e4 LT |
1157 | { NFSEXP_NOHIDE, {"nohide", ""}}, |
1158 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1159 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1160 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1161 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1162 | { 0, {"", ""}} |
1163 | }; | |
1164 | ||
ac34cdb0 | 1165 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1166 | { |
1da177e4 | 1167 | struct flags *flg; |
ac34cdb0 | 1168 | int state, first = 0; |
1da177e4 LT |
1169 | |
1170 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1171 | if (flg->flag & ~mask) |
1172 | continue; | |
1173 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1174 | if (*flg->name[state]) |
1175 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1176 | } | |
ac34cdb0 BF |
1177 | } |
1178 | ||
91fe39d3 BF |
1179 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1180 | { | |
1181 | seq_printf(m, ","); | |
1182 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1183 | } | |
1184 | ||
74ec1e12 BF |
1185 | static bool secinfo_flags_equal(int f, int g) |
1186 | { | |
1187 | f &= NFSEXP_SECINFO_FLAGS; | |
1188 | g &= NFSEXP_SECINFO_FLAGS; | |
1189 | return f == g; | |
1190 | } | |
1191 | ||
1192 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1193 | { | |
1194 | int flags; | |
1195 | ||
1196 | flags = (*fp)->flags; | |
1197 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1198 | (*fp)++; | |
1199 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1200 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1201 | (*fp)++; | |
1202 | } | |
1203 | return flags; | |
1204 | } | |
1205 | ||
91fe39d3 BF |
1206 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1207 | { | |
1208 | struct exp_flavor_info *f; | |
1209 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1210 | int flags; |
91fe39d3 BF |
1211 | |
1212 | if (exp->ex_nflavors == 0) | |
1213 | return; | |
74ec1e12 BF |
1214 | f = exp->ex_flavors; |
1215 | flags = show_secinfo_run(m, &f, end); | |
1216 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1217 | show_secinfo_flags(m, flags); | |
1218 | while (f != end) { | |
1219 | flags = show_secinfo_run(m, &f, end); | |
1220 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1221 | } |
91fe39d3 BF |
1222 | } |
1223 | ||
ac34cdb0 | 1224 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
4c1e1b34 | 1225 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
ac34cdb0 BF |
1226 | { |
1227 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1228 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1229 | seq_printf(m, ",fsid=%d", fsid); |
4c1e1b34 EB |
1230 | if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) && |
1231 | !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2))) | |
1232 | seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu)); | |
1233 | if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) && | |
1234 | !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2))) | |
1235 | seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong)); | |
93346919 MN |
1236 | if (fsloc && fsloc->locations_count > 0) { |
1237 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1238 | int i; | |
1239 | ||
ac34cdb0 | 1240 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1241 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1242 | seq_putc(m, '@'); | |
1243 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1244 | for (i = 1; i < fsloc->locations_count; i++) { | |
1245 | seq_putc(m, ';'); | |
1246 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1247 | seq_putc(m, '@'); | |
1248 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1249 | } | |
1250 | } | |
1da177e4 LT |
1251 | } |
1252 | ||
1253 | static int e_show(struct seq_file *m, void *p) | |
1254 | { | |
1255 | struct cache_head *cp = p; | |
1256 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1257 | struct cache_detail *cd = m->private; |
1da177e4 | 1258 | |
bc6f02e5 | 1259 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1260 | seq_puts(m, "# Version 1.1\n"); |
1261 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1262 | return 0; | |
1263 | } | |
1264 | ||
bf18f163 | 1265 | exp_get(exp); |
f2c7ea10 | 1266 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1267 | return 0; |
a09581f2 | 1268 | exp_put(exp); |
f2c7ea10 | 1269 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1270 | } |
1271 | ||
88e9d34c | 1272 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1273 | .start = e_start, |
1274 | .next = e_next, | |
1275 | .stop = e_stop, | |
1276 | .show = e_show, | |
1277 | }; | |
1278 | ||
1da177e4 LT |
1279 | /* |
1280 | * Initialize the exports module. | |
1281 | */ | |
dbf847ec | 1282 | int |
b89109be | 1283 | nfsd_export_init(struct net *net) |
1da177e4 | 1284 | { |
dbf847ec | 1285 | int rv; |
b3853e0e SK |
1286 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1287 | ||
b89109be | 1288 | dprintk("nfsd: initializing export module (net: %p).\n", net); |
1da177e4 | 1289 | |
b3853e0e SK |
1290 | nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
1291 | if (IS_ERR(nn->svc_export_cache)) | |
1292 | return PTR_ERR(nn->svc_export_cache); | |
1293 | rv = cache_register_net(nn->svc_export_cache, net); | |
dbf847ec | 1294 | if (rv) |
b3853e0e SK |
1295 | goto destroy_export_cache; |
1296 | ||
e5f06f72 SK |
1297 | nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
1298 | if (IS_ERR(nn->svc_expkey_cache)) { | |
1299 | rv = PTR_ERR(nn->svc_expkey_cache); | |
b3853e0e | 1300 | goto unregister_export_cache; |
e5f06f72 SK |
1301 | } |
1302 | rv = cache_register_net(nn->svc_expkey_cache, net); | |
1303 | if (rv) | |
1304 | goto destroy_expkey_cache; | |
b3853e0e | 1305 | return 0; |
1da177e4 | 1306 | |
e5f06f72 SK |
1307 | destroy_expkey_cache: |
1308 | cache_destroy_net(nn->svc_expkey_cache, net); | |
b3853e0e SK |
1309 | unregister_export_cache: |
1310 | cache_unregister_net(nn->svc_export_cache, net); | |
1311 | destroy_export_cache: | |
1312 | cache_destroy_net(nn->svc_export_cache, net); | |
1313 | return rv; | |
1da177e4 LT |
1314 | } |
1315 | ||
1316 | /* | |
1317 | * Flush exports table - called when last nfsd thread is killed | |
1318 | */ | |
1319 | void | |
b3853e0e | 1320 | nfsd_export_flush(struct net *net) |
1da177e4 | 1321 | { |
b3853e0e SK |
1322 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1323 | ||
e5f06f72 | 1324 | cache_purge(nn->svc_expkey_cache); |
b3853e0e | 1325 | cache_purge(nn->svc_export_cache); |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | /* | |
1329 | * Shutdown the exports module. | |
1330 | */ | |
1331 | void | |
b89109be | 1332 | nfsd_export_shutdown(struct net *net) |
1da177e4 | 1333 | { |
b3853e0e | 1334 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 1335 | |
b89109be | 1336 | dprintk("nfsd: shutting down export module (net: %p).\n", net); |
1da177e4 | 1337 | |
e5f06f72 | 1338 | cache_unregister_net(nn->svc_expkey_cache, net); |
b3853e0e | 1339 | cache_unregister_net(nn->svc_export_cache, net); |
e5f06f72 | 1340 | cache_destroy_net(nn->svc_expkey_cache, net); |
b3853e0e | 1341 | cache_destroy_net(nn->svc_export_cache, net); |
e5f06f72 | 1342 | svcauth_unix_purge(net); |
1da177e4 | 1343 | |
b89109be | 1344 | dprintk("nfsd: export shutdown complete (net: %p).\n", net); |
1da177e4 | 1345 | } |