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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 | |
f15364bd | 20 | #include <net/ipv6.h> |
1da177e4 | 21 | |
9a74af21 | 22 | #include "nfsd.h" |
1557aca7 | 23 | #include "nfsfh.h" |
b3853e0e | 24 | #include "netns.h" |
9a74af21 | 25 | |
1da177e4 | 26 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
1da177e4 LT |
27 | |
28 | typedef struct auth_domain svc_client; | |
29 | typedef struct svc_export svc_export; | |
30 | ||
1da177e4 LT |
31 | /* |
32 | * We have two caches. | |
33 | * One maps client+vfsmnt+dentry to export options - the export map | |
34 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
35 | * | |
36 | * The export options are actually stored in the first map, and the | |
37 | * second map contains a reference to the entry in the first map. | |
38 | */ | |
39 | ||
40 | #define EXPKEY_HASHBITS 8 | |
41 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
42 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
1da177e4 | 43 | |
74cae61a | 44 | static void expkey_put(struct kref *ref) |
1da177e4 | 45 | { |
baab935f N |
46 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
47 | ||
48 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
e83aece3 JB |
49 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
50 | path_put(&key->ek_path); | |
baab935f N |
51 | auth_domain_put(key->ek_client); |
52 | kfree(key); | |
1da177e4 LT |
53 | } |
54 | ||
55 | static void expkey_request(struct cache_detail *cd, | |
56 | struct cache_head *h, | |
57 | char **bpp, int *blen) | |
58 | { | |
59 | /* client fsidtype \xfsid */ | |
60 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
61 | char type[5]; | |
62 | ||
63 | qword_add(bpp, blen, ek->ek_client->name); | |
64 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
65 | qword_add(bpp, blen, type); | |
66 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
67 | (*bpp)[-1] = '\n'; | |
68 | } | |
69 | ||
bc74b4f5 TM |
70 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
71 | { | |
72 | return sunrpc_cache_pipe_upcall(cd, h, expkey_request); | |
73 | } | |
74 | ||
c89172e3 SK |
75 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
76 | struct svc_expkey *old); | |
77 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); | |
74cae61a | 78 | |
1da177e4 LT |
79 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
80 | { | |
81 | /* client fsidtype fsid [path] */ | |
82 | char *buf; | |
83 | int len; | |
84 | struct auth_domain *dom = NULL; | |
85 | int err; | |
86 | int fsidtype; | |
87 | char *ep; | |
88 | struct svc_expkey key; | |
30bc4dfd | 89 | struct svc_expkey *ek = NULL; |
1da177e4 | 90 | |
3476964d | 91 | if (mesg[mlen - 1] != '\n') |
1da177e4 LT |
92 | return -EINVAL; |
93 | mesg[mlen-1] = 0; | |
94 | ||
95 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
96 | err = -ENOMEM; | |
30bc4dfd BF |
97 | if (!buf) |
98 | goto out; | |
1da177e4 LT |
99 | |
100 | err = -EINVAL; | |
101 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
102 | goto out; | |
103 | ||
104 | err = -ENOENT; | |
105 | dom = auth_domain_find(buf); | |
106 | if (!dom) | |
107 | goto out; | |
108 | dprintk("found domain %s\n", buf); | |
109 | ||
110 | err = -EINVAL; | |
111 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
112 | goto out; | |
113 | fsidtype = simple_strtoul(buf, &ep, 10); | |
114 | if (*ep) | |
115 | goto out; | |
116 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 117 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
118 | goto out; |
119 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
120 | goto out; | |
121 | dprintk("found fsid length %d\n", len); | |
122 | if (len != key_len(fsidtype)) | |
123 | goto out; | |
124 | ||
125 | /* OK, we seem to have a valid key */ | |
126 | key.h.flags = 0; | |
127 | key.h.expiry_time = get_expiry(&mesg); | |
128 | if (key.h.expiry_time == 0) | |
129 | goto out; | |
130 | ||
131 | key.ek_client = dom; | |
132 | key.ek_fsidtype = fsidtype; | |
133 | memcpy(key.ek_fsid, buf, len); | |
134 | ||
c89172e3 | 135 | ek = svc_expkey_lookup(cd, &key); |
8d270f7f N |
136 | err = -ENOMEM; |
137 | if (!ek) | |
138 | goto out; | |
139 | ||
1da177e4 | 140 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 141 | err = -EINVAL; |
30bc4dfd BF |
142 | len = qword_get(&mesg, buf, PAGE_SIZE); |
143 | if (len < 0) | |
1da177e4 LT |
144 | goto out; |
145 | dprintk("Path seems to be <%s>\n", buf); | |
146 | err = 0; | |
147 | if (len == 0) { | |
1da177e4 | 148 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
c89172e3 | 149 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd BF |
150 | if (!ek) |
151 | err = -ENOMEM; | |
1da177e4 | 152 | } else { |
a63bb996 | 153 | err = kern_path(buf, 0, &key.ek_path); |
30bc4dfd | 154 | if (err) |
1da177e4 LT |
155 | goto out; |
156 | ||
157 | dprintk("Found the path %s\n", buf); | |
e83aece3 | 158 | |
c89172e3 | 159 | ek = svc_expkey_update(cd, &key, ek); |
30bc4dfd | 160 | if (!ek) |
8d270f7f | 161 | err = -ENOMEM; |
a63bb996 | 162 | path_put(&key.ek_path); |
1da177e4 LT |
163 | } |
164 | cache_flush(); | |
165 | out: | |
30bc4dfd | 166 | if (ek) |
d4bb527e | 167 | cache_put(&ek->h, cd); |
1da177e4 LT |
168 | if (dom) |
169 | auth_domain_put(dom); | |
f99d49ad | 170 | kfree(buf); |
1da177e4 LT |
171 | return err; |
172 | } | |
173 | ||
174 | static int expkey_show(struct seq_file *m, | |
175 | struct cache_detail *cd, | |
176 | struct cache_head *h) | |
177 | { | |
178 | struct svc_expkey *ek ; | |
af6a4e28 | 179 | int i; |
1da177e4 LT |
180 | |
181 | if (h ==NULL) { | |
182 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
183 | return 0; | |
184 | } | |
185 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
186 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
187 | ek->ek_fsidtype); | |
188 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
189 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
190 | if (test_bit(CACHE_VALID, &h->flags) && |
191 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
192 | seq_printf(m, " "); | |
c32c2f63 | 193 | seq_path(m, &ek->ek_path, "\\ \t\n"); |
1da177e4 LT |
194 | } |
195 | seq_printf(m, "\n"); | |
196 | return 0; | |
197 | } | |
1da177e4 | 198 | |
8d270f7f | 199 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 200 | { |
8d270f7f N |
201 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
202 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
203 | ||
204 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
205 | orig->ek_client != new->ek_client || | |
206 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
207 | return 0; |
208 | return 1; | |
209 | } | |
210 | ||
8d270f7f N |
211 | static inline void expkey_init(struct cache_head *cnew, |
212 | struct cache_head *citem) | |
1da177e4 | 213 | { |
8d270f7f N |
214 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
215 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
216 | ||
efc36aa5 | 217 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
218 | new->ek_client = item->ek_client; |
219 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
220 | |
221 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
222 | } |
223 | ||
8d270f7f N |
224 | static inline void expkey_update(struct cache_head *cnew, |
225 | struct cache_head *citem) | |
1da177e4 | 226 | { |
8d270f7f N |
227 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
228 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
229 | ||
e83aece3 JB |
230 | new->ek_path = item->ek_path; |
231 | path_get(&item->ek_path); | |
1da177e4 LT |
232 | } |
233 | ||
8d270f7f N |
234 | static struct cache_head *expkey_alloc(void) |
235 | { | |
236 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
237 | if (i) | |
238 | return &i->h; | |
239 | else | |
240 | return NULL; | |
241 | } | |
242 | ||
e5f06f72 | 243 | static struct cache_detail svc_expkey_cache_template = { |
8d270f7f N |
244 | .owner = THIS_MODULE, |
245 | .hash_size = EXPKEY_HASHMAX, | |
8d270f7f N |
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 | 300 | |
93346919 MN |
301 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
302 | { | |
303 | int i; | |
304 | ||
305 | for (i = 0; i < fsloc->locations_count; i++) { | |
306 | kfree(fsloc->locations[i].path); | |
307 | kfree(fsloc->locations[i].hosts); | |
308 | } | |
309 | kfree(fsloc->locations); | |
310 | } | |
311 | ||
baab935f | 312 | static void svc_export_put(struct kref *ref) |
1da177e4 | 313 | { |
baab935f | 314 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
54775491 | 315 | path_put(&exp->ex_path); |
baab935f | 316 | auth_domain_put(exp->ex_client); |
93346919 | 317 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 318 | kfree(exp); |
1da177e4 LT |
319 | } |
320 | ||
321 | static void svc_export_request(struct cache_detail *cd, | |
322 | struct cache_head *h, | |
323 | char **bpp, int *blen) | |
324 | { | |
325 | /* client path */ | |
326 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
327 | char *pth; | |
328 | ||
329 | qword_add(bpp, blen, exp->ex_client->name); | |
cf28b486 | 330 | pth = d_path(&exp->ex_path, *bpp, *blen); |
1da177e4 LT |
331 | if (IS_ERR(pth)) { |
332 | /* is this correct? */ | |
333 | (*bpp)[0] = '\n'; | |
334 | return; | |
335 | } | |
336 | qword_add(bpp, blen, pth); | |
337 | (*bpp)[-1] = '\n'; | |
338 | } | |
339 | ||
bc74b4f5 TM |
340 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
341 | { | |
342 | return sunrpc_cache_pipe_upcall(cd, h, svc_export_request); | |
343 | } | |
344 | ||
74cae61a AB |
345 | static struct svc_export *svc_export_update(struct svc_export *new, |
346 | struct svc_export *old); | |
4f7774c3 | 347 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 348 | |
774b1478 | 349 | static int check_export(struct inode *inode, int *flags, unsigned char *uuid) |
1da177e4 LT |
350 | { |
351 | ||
f2ca7153 BF |
352 | /* |
353 | * We currently export only dirs, regular files, and (for v4 | |
354 | * pseudoroot) symlinks. | |
1da177e4 LT |
355 | */ |
356 | if (!S_ISDIR(inode->i_mode) && | |
f2ca7153 | 357 | !S_ISLNK(inode->i_mode) && |
1da177e4 LT |
358 | !S_ISREG(inode->i_mode)) |
359 | return -ENOTDIR; | |
360 | ||
774b1478 BF |
361 | /* |
362 | * Mountd should never pass down a writeable V4ROOT export, but, | |
363 | * just to make sure: | |
364 | */ | |
365 | if (*flags & NFSEXP_V4ROOT) | |
366 | *flags |= NFSEXP_READONLY; | |
367 | ||
1da177e4 LT |
368 | /* There are two requirements on a filesystem to be exportable. |
369 | * 1: We must be able to identify the filesystem from a number. | |
370 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 371 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
372 | * 2: We must be able to find an inode from a filehandle. |
373 | * This means that s_export_op must be set. | |
374 | */ | |
375 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
774b1478 | 376 | !(*flags & NFSEXP_FSID) && |
af6a4e28 | 377 | uuid == NULL) { |
3e3b4800 | 378 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
379 | return -EINVAL; |
380 | } | |
cfaea787 CH |
381 | |
382 | if (!inode->i_sb->s_export_op || | |
383 | !inode->i_sb->s_export_op->fh_to_dentry) { | |
1da177e4 LT |
384 | dprintk("exp_export: export of invalid fs type.\n"); |
385 | return -EINVAL; | |
386 | } | |
387 | ||
1da177e4 LT |
388 | return 0; |
389 | ||
390 | } | |
391 | ||
93346919 MN |
392 | #ifdef CONFIG_NFSD_V4 |
393 | ||
394 | static int | |
395 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
396 | { | |
397 | int len; | |
398 | int migrated, i, err; | |
399 | ||
93346919 | 400 | /* listsize */ |
a007c4c3 | 401 | err = get_uint(mesg, &fsloc->locations_count); |
93346919 MN |
402 | if (err) |
403 | return err; | |
404 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
405 | return -EINVAL; | |
406 | if (fsloc->locations_count == 0) | |
407 | return 0; | |
408 | ||
409 | fsloc->locations = kzalloc(fsloc->locations_count | |
410 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
411 | if (!fsloc->locations) | |
412 | return -ENOMEM; | |
413 | for (i=0; i < fsloc->locations_count; i++) { | |
414 | /* colon separated host list */ | |
415 | err = -EINVAL; | |
416 | len = qword_get(mesg, buf, PAGE_SIZE); | |
417 | if (len <= 0) | |
418 | goto out_free_all; | |
419 | err = -ENOMEM; | |
420 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
421 | if (!fsloc->locations[i].hosts) | |
422 | goto out_free_all; | |
423 | err = -EINVAL; | |
424 | /* slash separated path component list */ | |
425 | len = qword_get(mesg, buf, PAGE_SIZE); | |
426 | if (len <= 0) | |
427 | goto out_free_all; | |
428 | err = -ENOMEM; | |
429 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
430 | if (!fsloc->locations[i].path) | |
431 | goto out_free_all; | |
432 | } | |
433 | /* migrated */ | |
434 | err = get_int(mesg, &migrated); | |
435 | if (err) | |
436 | goto out_free_all; | |
437 | err = -EINVAL; | |
438 | if (migrated < 0 || migrated > 1) | |
439 | goto out_free_all; | |
440 | fsloc->migrated = migrated; | |
441 | return 0; | |
442 | out_free_all: | |
443 | nfsd4_fslocs_free(fsloc); | |
444 | return err; | |
445 | } | |
446 | ||
e677bfe4 AA |
447 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
448 | { | |
449 | int listsize, err; | |
450 | struct exp_flavor_info *f; | |
451 | ||
452 | err = get_int(mesg, &listsize); | |
453 | if (err) | |
454 | return err; | |
455 | if (listsize < 0 || listsize > MAX_SECINFO_LIST) | |
456 | return -EINVAL; | |
457 | ||
458 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { | |
a007c4c3 | 459 | err = get_uint(mesg, &f->pseudoflavor); |
e677bfe4 AA |
460 | if (err) |
461 | return err; | |
462 | /* | |
80492e7d RK |
463 | * XXX: It would be nice to also check whether this |
464 | * pseudoflavor is supported, so we can discover the | |
465 | * problem at export time instead of when a client fails | |
466 | * to authenticate. | |
e677bfe4 | 467 | */ |
a007c4c3 | 468 | err = get_uint(mesg, &f->flags); |
e677bfe4 AA |
469 | if (err) |
470 | return err; | |
471 | /* Only some flags are allowed to differ between flavors: */ | |
472 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
473 | return -EINVAL; | |
474 | } | |
475 | exp->ex_nflavors = listsize; | |
476 | return 0; | |
477 | } | |
478 | ||
93346919 | 479 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
480 | static inline int |
481 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
482 | static inline int | |
483 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
484 | #endif |
485 | ||
1da177e4 LT |
486 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
487 | { | |
488 | /* client path expiry [flags anonuid anongid fsid] */ | |
489 | char *buf; | |
490 | int len; | |
491 | int err; | |
492 | struct auth_domain *dom = NULL; | |
c1a2a475 | 493 | struct svc_export exp = {}, *expp; |
1da177e4 LT |
494 | int an_int; |
495 | ||
1da177e4 LT |
496 | if (mesg[mlen-1] != '\n') |
497 | return -EINVAL; | |
498 | mesg[mlen-1] = 0; | |
499 | ||
500 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
c1a2a475 AV |
501 | if (!buf) |
502 | return -ENOMEM; | |
1da177e4 LT |
503 | |
504 | /* client */ | |
1da177e4 | 505 | err = -EINVAL; |
c1a2a475 AV |
506 | len = qword_get(&mesg, buf, PAGE_SIZE); |
507 | if (len <= 0) | |
508 | goto out; | |
1da177e4 LT |
509 | |
510 | err = -ENOENT; | |
511 | dom = auth_domain_find(buf); | |
512 | if (!dom) | |
513 | goto out; | |
514 | ||
515 | /* path */ | |
516 | err = -EINVAL; | |
c1a2a475 AV |
517 | if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0) |
518 | goto out1; | |
519 | ||
520 | err = kern_path(buf, 0, &exp.ex_path); | |
521 | if (err) | |
522 | goto out1; | |
1da177e4 | 523 | |
1da177e4 | 524 | exp.ex_client = dom; |
db3a3532 | 525 | exp.cd = cd; |
c1a2a475 | 526 | |
1da177e4 LT |
527 | /* expiry */ |
528 | err = -EINVAL; | |
529 | exp.h.expiry_time = get_expiry(&mesg); | |
530 | if (exp.h.expiry_time == 0) | |
c1a2a475 | 531 | goto out3; |
1da177e4 LT |
532 | |
533 | /* flags */ | |
534 | err = get_int(&mesg, &an_int); | |
4a4b8831 BF |
535 | if (err == -ENOENT) { |
536 | err = 0; | |
1da177e4 | 537 | set_bit(CACHE_NEGATIVE, &exp.h.flags); |
4a4b8831 | 538 | } else { |
c1a2a475 AV |
539 | if (err || an_int < 0) |
540 | goto out3; | |
1da177e4 LT |
541 | exp.ex_flags= an_int; |
542 | ||
543 | /* anon uid */ | |
544 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
545 | if (err) |
546 | goto out3; | |
1da177e4 LT |
547 | exp.ex_anon_uid= an_int; |
548 | ||
549 | /* anon gid */ | |
550 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
551 | if (err) |
552 | goto out3; | |
1da177e4 LT |
553 | exp.ex_anon_gid= an_int; |
554 | ||
555 | /* fsid */ | |
556 | err = get_int(&mesg, &an_int); | |
c1a2a475 AV |
557 | if (err) |
558 | goto out3; | |
1da177e4 LT |
559 | exp.ex_fsid = an_int; |
560 | ||
af6a4e28 N |
561 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
562 | if (strcmp(buf, "fsloc") == 0) | |
563 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
564 | else if (strcmp(buf, "uuid") == 0) { | |
565 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
566 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
567 | if (len != 16) | |
568 | err = -EINVAL; | |
569 | else { | |
570 | exp.ex_uuid = | |
571 | kmemdup(buf, 16, GFP_KERNEL); | |
572 | if (exp.ex_uuid == NULL) | |
573 | err = -ENOMEM; | |
574 | } | |
e677bfe4 AA |
575 | } else if (strcmp(buf, "secinfo") == 0) |
576 | err = secinfo_parse(&mesg, buf, &exp); | |
577 | else | |
af6a4e28 N |
578 | /* quietly ignore unknown words and anything |
579 | * following. Newer user-space can try to set | |
580 | * new values, then see what the result was. | |
581 | */ | |
582 | break; | |
583 | if (err) | |
c1a2a475 | 584 | goto out4; |
af6a4e28 | 585 | } |
93346919 | 586 | |
774b1478 | 587 | err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags, |
af6a4e28 | 588 | exp.ex_uuid); |
c1a2a475 AV |
589 | if (err) |
590 | goto out4; | |
1da177e4 LT |
591 | } |
592 | ||
4f7774c3 | 593 | expp = svc_export_lookup(&exp); |
1da177e4 | 594 | if (expp) |
4f7774c3 N |
595 | expp = svc_export_update(&exp, expp); |
596 | else | |
597 | err = -ENOMEM; | |
1da177e4 | 598 | cache_flush(); |
4f7774c3 N |
599 | if (expp == NULL) |
600 | err = -ENOMEM; | |
601 | else | |
602 | exp_put(expp); | |
c1a2a475 | 603 | out4: |
af6a4e28 N |
604 | nfsd4_fslocs_free(&exp.ex_fslocs); |
605 | kfree(exp.ex_uuid); | |
c1a2a475 | 606 | out3: |
c1a2a475 AV |
607 | path_put(&exp.ex_path); |
608 | out1: | |
609 | auth_domain_put(dom); | |
610 | out: | |
f99d49ad | 611 | kfree(buf); |
1da177e4 LT |
612 | return err; |
613 | } | |
614 | ||
93346919 MN |
615 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
616 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
91fe39d3 | 617 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
1da177e4 LT |
618 | |
619 | static int svc_export_show(struct seq_file *m, | |
620 | struct cache_detail *cd, | |
621 | struct cache_head *h) | |
622 | { | |
623 | struct svc_export *exp ; | |
624 | ||
625 | if (h ==NULL) { | |
626 | seq_puts(m, "#path domain(flags)\n"); | |
627 | return 0; | |
628 | } | |
629 | exp = container_of(h, struct svc_export, h); | |
c32c2f63 | 630 | seq_path(m, &exp->ex_path, " \t\n\\"); |
1da177e4 LT |
631 | seq_putc(m, '\t'); |
632 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
633 | seq_putc(m, '('); | |
634 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 635 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
636 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
637 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
638 | if (exp->ex_uuid) { |
639 | int i; | |
640 | seq_puts(m, ",uuid="); | |
641 | for (i=0; i<16; i++) { | |
642 | if ((i&3) == 0 && i) | |
643 | seq_putc(m, ':'); | |
644 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
645 | } | |
646 | } | |
91fe39d3 | 647 | show_secinfo(m, exp); |
af6a4e28 | 648 | } |
1da177e4 LT |
649 | seq_puts(m, ")\n"); |
650 | return 0; | |
651 | } | |
4f7774c3 | 652 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 653 | { |
4f7774c3 N |
654 | struct svc_export *orig = container_of(a, struct svc_export, h); |
655 | struct svc_export *new = container_of(b, struct svc_export, h); | |
656 | return orig->ex_client == new->ex_client && | |
54775491 JB |
657 | orig->ex_path.dentry == new->ex_path.dentry && |
658 | orig->ex_path.mnt == new->ex_path.mnt; | |
1da177e4 | 659 | } |
4f7774c3 N |
660 | |
661 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 662 | { |
4f7774c3 N |
663 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
664 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
665 | ||
efc36aa5 | 666 | kref_get(&item->ex_client->ref); |
1da177e4 | 667 | new->ex_client = item->ex_client; |
54775491 JB |
668 | new->ex_path.dentry = dget(item->ex_path.dentry); |
669 | new->ex_path.mnt = mntget(item->ex_path.mnt); | |
93346919 MN |
670 | new->ex_fslocs.locations = NULL; |
671 | new->ex_fslocs.locations_count = 0; | |
672 | new->ex_fslocs.migrated = 0; | |
db3a3532 | 673 | new->cd = item->cd; |
1da177e4 LT |
674 | } |
675 | ||
4f7774c3 | 676 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 677 | { |
4f7774c3 N |
678 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
679 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 680 | int i; |
4f7774c3 | 681 | |
1da177e4 LT |
682 | new->ex_flags = item->ex_flags; |
683 | new->ex_anon_uid = item->ex_anon_uid; | |
684 | new->ex_anon_gid = item->ex_anon_gid; | |
685 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
686 | new->ex_uuid = item->ex_uuid; |
687 | item->ex_uuid = NULL; | |
93346919 MN |
688 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
689 | item->ex_fslocs.locations = NULL; | |
690 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
691 | item->ex_fslocs.locations_count = 0; | |
692 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
693 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
694 | new->ex_nflavors = item->ex_nflavors; |
695 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
696 | new->ex_flavors[i] = item->ex_flavors[i]; | |
697 | } | |
1da177e4 LT |
698 | } |
699 | ||
4f7774c3 N |
700 | static struct cache_head *svc_export_alloc(void) |
701 | { | |
702 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
703 | if (i) | |
704 | return &i->h; | |
705 | else | |
706 | return NULL; | |
707 | } | |
708 | ||
2355c596 | 709 | static struct cache_detail svc_export_cache_template = { |
4f7774c3 N |
710 | .owner = THIS_MODULE, |
711 | .hash_size = EXPORT_HASHMAX, | |
4f7774c3 N |
712 | .name = "nfsd.export", |
713 | .cache_put = svc_export_put, | |
bc74b4f5 | 714 | .cache_upcall = svc_export_upcall, |
4f7774c3 N |
715 | .cache_parse = svc_export_parse, |
716 | .cache_show = svc_export_show, | |
717 | .match = svc_export_match, | |
718 | .init = svc_export_init, | |
719 | .update = export_update, | |
720 | .alloc = svc_export_alloc, | |
721 | }; | |
722 | ||
61f8603d N |
723 | static int |
724 | svc_export_hash(struct svc_export *exp) | |
4f7774c3 | 725 | { |
4f7774c3 | 726 | int hash; |
61f8603d | 727 | |
4f7774c3 | 728 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); |
54775491 JB |
729 | hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS); |
730 | hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS); | |
61f8603d N |
731 | return hash; |
732 | } | |
733 | ||
734 | static struct svc_export * | |
735 | svc_export_lookup(struct svc_export *exp) | |
736 | { | |
737 | struct cache_head *ch; | |
738 | int hash = svc_export_hash(exp); | |
4f7774c3 | 739 | |
db3a3532 | 740 | ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash); |
4f7774c3 N |
741 | if (ch) |
742 | return container_of(ch, struct svc_export, h); | |
743 | else | |
744 | return NULL; | |
745 | } | |
746 | ||
74cae61a | 747 | static struct svc_export * |
4f7774c3 N |
748 | svc_export_update(struct svc_export *new, struct svc_export *old) |
749 | { | |
750 | struct cache_head *ch; | |
61f8603d | 751 | int hash = svc_export_hash(old); |
4f7774c3 | 752 | |
db3a3532 | 753 | ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash); |
4f7774c3 N |
754 | if (ch) |
755 | return container_of(ch, struct svc_export, h); | |
756 | else | |
757 | return NULL; | |
758 | } | |
1da177e4 LT |
759 | |
760 | ||
74cae61a | 761 | static struct svc_expkey * |
c89172e3 SK |
762 | exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type, |
763 | u32 *fsidv, struct cache_req *reqp) | |
1da177e4 LT |
764 | { |
765 | struct svc_expkey key, *ek; | |
766 | int err; | |
767 | ||
768 | if (!clp) | |
2d3bb252 | 769 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
770 | |
771 | key.ek_client = clp; | |
772 | key.ek_fsidtype = fsid_type; | |
773 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
774 | ||
c89172e3 | 775 | ek = svc_expkey_lookup(cd, &key); |
2d3bb252 BF |
776 | if (ek == NULL) |
777 | return ERR_PTR(-ENOMEM); | |
c89172e3 | 778 | err = cache_check(cd, &ek->h, reqp); |
2d3bb252 BF |
779 | if (err) |
780 | return ERR_PTR(err); | |
1da177e4 LT |
781 | return ek; |
782 | } | |
783 | ||
1da177e4 | 784 | |
2a75cfa6 SK |
785 | static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp, |
786 | const struct path *path, struct cache_req *reqp) | |
1da177e4 LT |
787 | { |
788 | struct svc_export *exp, key; | |
2d3bb252 | 789 | int err; |
e83aece3 | 790 | |
1da177e4 | 791 | if (!clp) |
2d3bb252 | 792 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
793 | |
794 | key.ex_client = clp; | |
55430e2e | 795 | key.ex_path = *path; |
2a75cfa6 | 796 | key.cd = cd; |
1da177e4 | 797 | |
4f7774c3 | 798 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
799 | if (exp == NULL) |
800 | return ERR_PTR(-ENOMEM); | |
2a75cfa6 | 801 | err = cache_check(cd, &exp->h, reqp); |
2d3bb252 BF |
802 | if (err) |
803 | return ERR_PTR(err); | |
1da177e4 LT |
804 | return exp; |
805 | } | |
806 | ||
807 | /* | |
808 | * Find the export entry for a given dentry. | |
809 | */ | |
2a75cfa6 SK |
810 | static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp, |
811 | struct path *path) | |
1da177e4 | 812 | { |
5bf3bd2b | 813 | struct dentry *saved = dget(path->dentry); |
2a75cfa6 | 814 | svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
5bf3bd2b AV |
815 | |
816 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { | |
817 | struct dentry *parent = dget_parent(path->dentry); | |
818 | dput(path->dentry); | |
819 | path->dentry = parent; | |
2a75cfa6 | 820 | exp = exp_get_by_name(cd, clp, path, NULL); |
1da177e4 | 821 | } |
5bf3bd2b AV |
822 | dput(path->dentry); |
823 | path->dentry = saved; | |
1da177e4 LT |
824 | return exp; |
825 | } | |
826 | ||
1da177e4 | 827 | |
1da177e4 LT |
828 | |
829 | /* | |
830 | * Obtain the root fh on behalf of a client. | |
831 | * This could be done in user space, but I feel that it adds some safety | |
832 | * since its harder to fool a kernel module than a user space program. | |
833 | */ | |
834 | int | |
b3853e0e | 835 | exp_rootfh(struct net *net, svc_client *clp, char *name, |
2a75cfa6 | 836 | struct knfsd_fh *f, int maxsize) |
1da177e4 LT |
837 | { |
838 | struct svc_export *exp; | |
a63bb996 | 839 | struct path path; |
1da177e4 LT |
840 | struct inode *inode; |
841 | struct svc_fh fh; | |
842 | int err; | |
b3853e0e SK |
843 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
844 | struct cache_detail *cd = nn->svc_export_cache; | |
1da177e4 LT |
845 | |
846 | err = -EPERM; | |
847 | /* NB: we probably ought to check that it's NUL-terminated */ | |
a63bb996 AV |
848 | if (kern_path(name, 0, &path)) { |
849 | printk("nfsd: exp_rootfh path not found %s", name); | |
1da177e4 LT |
850 | return err; |
851 | } | |
a63bb996 | 852 | inode = path.dentry->d_inode; |
1da177e4 LT |
853 | |
854 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
a63bb996 | 855 | name, path.dentry, clp->name, |
1da177e4 | 856 | inode->i_sb->s_id, inode->i_ino); |
2a75cfa6 | 857 | exp = exp_parent(cd, clp, &path); |
4b41bd85 BF |
858 | if (IS_ERR(exp)) { |
859 | err = PTR_ERR(exp); | |
860 | goto out; | |
861 | } | |
1da177e4 LT |
862 | |
863 | /* | |
864 | * fh must be initialized before calling fh_compose | |
865 | */ | |
866 | fh_init(&fh, maxsize); | |
a63bb996 | 867 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1da177e4 LT |
868 | err = -EINVAL; |
869 | else | |
870 | err = 0; | |
871 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
872 | fh_put(&fh); | |
873 | exp_put(exp); | |
874 | out: | |
a63bb996 | 875 | path_put(&path); |
1da177e4 LT |
876 | return err; |
877 | } | |
878 | ||
2a75cfa6 SK |
879 | static struct svc_export *exp_find(struct cache_detail *cd, |
880 | struct auth_domain *clp, int fsid_type, | |
cce76f9b | 881 | u32 *fsidv, struct cache_req *reqp) |
eab7e2e6 N |
882 | { |
883 | struct svc_export *exp; | |
e5f06f72 SK |
884 | struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id); |
885 | struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 886 | if (IS_ERR(ek)) |
e231c2ee | 887 | return ERR_CAST(ek); |
eab7e2e6 | 888 | |
2a75cfa6 | 889 | exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp); |
e5f06f72 | 890 | cache_put(&ek->h, nn->svc_expkey_cache); |
eab7e2e6 | 891 | |
2d3bb252 | 892 | if (IS_ERR(exp)) |
e231c2ee | 893 | return ERR_CAST(exp); |
eab7e2e6 N |
894 | return exp; |
895 | } | |
896 | ||
32c1eb0c AA |
897 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
898 | { | |
899 | struct exp_flavor_info *f; | |
900 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
901 | ||
902 | /* legacy gss-only clients are always OK: */ | |
903 | if (exp->ex_client == rqstp->rq_gssclient) | |
904 | return 0; | |
905 | /* ip-address based client; check sec= export option: */ | |
906 | for (f = exp->ex_flavors; f < end; f++) { | |
d5497fc6 | 907 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
32c1eb0c AA |
908 | return 0; |
909 | } | |
910 | /* defaults in absence of sec= options: */ | |
911 | if (exp->ex_nflavors == 0) { | |
d5497fc6 BF |
912 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
913 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) | |
32c1eb0c AA |
914 | return 0; |
915 | } | |
916 | return nfserr_wrongsec; | |
917 | } | |
918 | ||
0989a788 | 919 | /* |
2ea2209f BF |
920 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
921 | * auth_unix client) if it's available and has secinfo information; | |
922 | * otherwise, will try to use rq_gssclient. | |
923 | * | |
0989a788 BF |
924 | * Called from functions that handle requests; functions that do work on |
925 | * behalf of mountd are passed a single client name to use, and should | |
926 | * use exp_get_by_name() or exp_find(). | |
927 | */ | |
928 | struct svc_export * | |
91c9fa8f | 929 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 930 | { |
9a25b96c | 931 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 932 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 933 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
934 | |
935 | if (rqstp->rq_client == NULL) | |
936 | goto gss; | |
3ab4d8b1 | 937 | |
2ea2209f | 938 | /* First try the auth_unix client: */ |
2a75cfa6 | 939 | exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle); |
2ea2209f BF |
940 | if (PTR_ERR(exp) == -ENOENT) |
941 | goto gss; | |
942 | if (IS_ERR(exp)) | |
943 | return exp; | |
944 | /* If it has secinfo, assume there are no gss/... clients */ | |
945 | if (exp->ex_nflavors > 0) | |
946 | return exp; | |
947 | gss: | |
948 | /* Otherwise, try falling back on gss client */ | |
949 | if (rqstp->rq_gssclient == NULL) | |
950 | return exp; | |
2a75cfa6 | 951 | gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle); |
2ea2209f BF |
952 | if (PTR_ERR(gssexp) == -ENOENT) |
953 | return exp; | |
9a25b96c | 954 | if (!IS_ERR(exp)) |
2ea2209f BF |
955 | exp_put(exp); |
956 | return gssexp; | |
0989a788 BF |
957 | } |
958 | ||
959 | struct svc_export * | |
960 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) | |
961 | { | |
9a25b96c | 962 | struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT); |
9695c705 | 963 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
b3853e0e | 964 | struct cache_detail *cd = nn->svc_export_cache; |
2ea2209f BF |
965 | |
966 | if (rqstp->rq_client == NULL) | |
967 | goto gss; | |
3ab4d8b1 | 968 | |
2ea2209f | 969 | /* First try the auth_unix client: */ |
2a75cfa6 SK |
970 | exp = exp_find(cd, rqstp->rq_client, fsid_type, |
971 | fsidv, &rqstp->rq_chandle); | |
2ea2209f BF |
972 | if (PTR_ERR(exp) == -ENOENT) |
973 | goto gss; | |
974 | if (IS_ERR(exp)) | |
975 | return exp; | |
976 | /* If it has secinfo, assume there are no gss/... clients */ | |
977 | if (exp->ex_nflavors > 0) | |
978 | return exp; | |
979 | gss: | |
980 | /* Otherwise, try falling back on gss client */ | |
981 | if (rqstp->rq_gssclient == NULL) | |
982 | return exp; | |
2a75cfa6 | 983 | gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv, |
2ea2209f BF |
984 | &rqstp->rq_chandle); |
985 | if (PTR_ERR(gssexp) == -ENOENT) | |
986 | return exp; | |
9a25b96c | 987 | if (!IS_ERR(exp)) |
2ea2209f BF |
988 | exp_put(exp); |
989 | return gssexp; | |
0989a788 BF |
990 | } |
991 | ||
992 | struct svc_export * | |
e64c390c | 993 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
0989a788 | 994 | { |
e64c390c AV |
995 | struct dentry *saved = dget(path->dentry); |
996 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 997 | |
e64c390c AV |
998 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
999 | struct dentry *parent = dget_parent(path->dentry); | |
1000 | dput(path->dentry); | |
1001 | path->dentry = parent; | |
1002 | exp = rqst_exp_get_by_name(rqstp, path); | |
2ea2209f | 1003 | } |
e64c390c AV |
1004 | dput(path->dentry); |
1005 | path->dentry = saved; | |
2ea2209f | 1006 | return exp; |
0989a788 | 1007 | } |
eab7e2e6 | 1008 | |
ed748aac | 1009 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
f39bde24 | 1010 | { |
f39bde24 BF |
1011 | u32 fsidv[2]; |
1012 | ||
1013 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); | |
1014 | ||
260c64d2 | 1015 | return rqst_exp_find(rqstp, FSID_NUM, fsidv); |
f39bde24 BF |
1016 | } |
1017 | ||
1da177e4 LT |
1018 | /* |
1019 | * Called when we need the filehandle for the root of the pseudofs, | |
1020 | * for a given NFSv4 client. The root is defined to be the | |
1021 | * export point with fsid==0 | |
1022 | */ | |
c7afef1f | 1023 | __be32 |
df547efb | 1024 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1025 | { |
eab7e2e6 | 1026 | struct svc_export *exp; |
c7afef1f | 1027 | __be32 rv; |
1da177e4 | 1028 | |
ed748aac | 1029 | exp = rqst_find_fsidzero_export(rqstp); |
6899320c BF |
1030 | if (IS_ERR(exp)) |
1031 | return nfserrno(PTR_ERR(exp)); | |
54775491 | 1032 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
d0ebd9c0 | 1033 | exp_put(exp); |
1da177e4 LT |
1034 | return rv; |
1035 | } | |
1036 | ||
1037 | /* Iterator */ | |
1038 | ||
1039 | static void *e_start(struct seq_file *m, loff_t *pos) | |
f2c7ea10 | 1040 | __acquires(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 LT |
1041 | { |
1042 | loff_t n = *pos; | |
1043 | unsigned hash, export; | |
1044 | struct cache_head *ch; | |
f2c7ea10 | 1045 | struct cache_detail *cd = m->private; |
83e0ed70 | 1046 | struct cache_head **export_table = cd->hash_table; |
f2c7ea10 SK |
1047 | |
1048 | read_lock(&cd->hash_lock); | |
1da177e4 | 1049 | if (!n--) |
bc6f02e5 | 1050 | return SEQ_START_TOKEN; |
1da177e4 LT |
1051 | hash = n >> 32; |
1052 | export = n & ((1LL<<32) - 1); | |
1053 | ||
1054 | ||
1055 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1056 | if (!export--) | |
1057 | return ch; | |
1058 | n &= ~((1LL<<32) - 1); | |
1059 | do { | |
1060 | hash++; | |
1061 | n += 1LL<<32; | |
1062 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1063 | if (hash >= EXPORT_HASHMAX) | |
1064 | return NULL; | |
1065 | *pos = n+1; | |
1066 | return export_table[hash]; | |
1067 | } | |
1068 | ||
1069 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1070 | { | |
1071 | struct cache_head *ch = p; | |
1072 | int hash = (*pos >> 32); | |
83e0ed70 SK |
1073 | struct cache_detail *cd = m->private; |
1074 | struct cache_head **export_table = cd->hash_table; | |
1da177e4 | 1075 | |
bc6f02e5 | 1076 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1077 | hash = 0; |
1078 | else if (ch->next == NULL) { | |
1079 | hash++; | |
1080 | *pos += 1LL<<32; | |
1081 | } else { | |
1082 | ++*pos; | |
1083 | return ch->next; | |
1084 | } | |
1085 | *pos &= ~((1LL<<32) - 1); | |
1086 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1087 | hash++; | |
1088 | *pos += 1LL<<32; | |
1089 | } | |
1090 | if (hash >= EXPORT_HASHMAX) | |
1091 | return NULL; | |
1092 | ++*pos; | |
1093 | return export_table[hash]; | |
1094 | } | |
1095 | ||
1096 | static void e_stop(struct seq_file *m, void *p) | |
f2c7ea10 | 1097 | __releases(((struct cache_detail *)m->private)->hash_lock) |
1da177e4 | 1098 | { |
f2c7ea10 SK |
1099 | struct cache_detail *cd = m->private; |
1100 | ||
1101 | read_unlock(&cd->hash_lock); | |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | static struct flags { | |
1105 | int flag; | |
1106 | char *name[2]; | |
1107 | } expflags[] = { | |
1108 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1109 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1110 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1111 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1112 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1113 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1114 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1115 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1116 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1117 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
eb4c86c6 | 1118 | { NFSEXP_V4ROOT, {"v4root", ""}}, |
1da177e4 LT |
1119 | { 0, {"", ""}} |
1120 | }; | |
1121 | ||
ac34cdb0 | 1122 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1da177e4 | 1123 | { |
1da177e4 | 1124 | struct flags *flg; |
ac34cdb0 | 1125 | int state, first = 0; |
1da177e4 LT |
1126 | |
1127 | for (flg = expflags; flg->flag; flg++) { | |
ac34cdb0 BF |
1128 | if (flg->flag & ~mask) |
1129 | continue; | |
1130 | state = (flg->flag & flags) ? 0 : 1; | |
1da177e4 LT |
1131 | if (*flg->name[state]) |
1132 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1133 | } | |
ac34cdb0 BF |
1134 | } |
1135 | ||
91fe39d3 BF |
1136 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1137 | { | |
1138 | seq_printf(m, ","); | |
1139 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); | |
1140 | } | |
1141 | ||
74ec1e12 BF |
1142 | static bool secinfo_flags_equal(int f, int g) |
1143 | { | |
1144 | f &= NFSEXP_SECINFO_FLAGS; | |
1145 | g &= NFSEXP_SECINFO_FLAGS; | |
1146 | return f == g; | |
1147 | } | |
1148 | ||
1149 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) | |
1150 | { | |
1151 | int flags; | |
1152 | ||
1153 | flags = (*fp)->flags; | |
1154 | seq_printf(m, ",sec=%d", (*fp)->pseudoflavor); | |
1155 | (*fp)++; | |
1156 | while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) { | |
1157 | seq_printf(m, ":%d", (*fp)->pseudoflavor); | |
1158 | (*fp)++; | |
1159 | } | |
1160 | return flags; | |
1161 | } | |
1162 | ||
91fe39d3 BF |
1163 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1164 | { | |
1165 | struct exp_flavor_info *f; | |
1166 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; | |
74ec1e12 | 1167 | int flags; |
91fe39d3 BF |
1168 | |
1169 | if (exp->ex_nflavors == 0) | |
1170 | return; | |
74ec1e12 BF |
1171 | f = exp->ex_flavors; |
1172 | flags = show_secinfo_run(m, &f, end); | |
1173 | if (!secinfo_flags_equal(flags, exp->ex_flags)) | |
1174 | show_secinfo_flags(m, flags); | |
1175 | while (f != end) { | |
1176 | flags = show_secinfo_run(m, &f, end); | |
1177 | show_secinfo_flags(m, flags); | |
91fe39d3 | 1178 | } |
91fe39d3 BF |
1179 | } |
1180 | ||
ac34cdb0 BF |
1181 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1182 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1183 | { | |
1184 | show_expflags(m, flag, NFSEXP_ALLFLAGS); | |
1da177e4 | 1185 | if (flag & NFSEXP_FSID) |
ac34cdb0 | 1186 | seq_printf(m, ",fsid=%d", fsid); |
1da177e4 | 1187 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) |
3e63516c | 1188 | seq_printf(m, ",anonuid=%u", anonu); |
1da177e4 | 1189 | if (anong != (gid_t)-2 && anong != (0x10000-2)) |
3e63516c | 1190 | seq_printf(m, ",anongid=%u", anong); |
93346919 MN |
1191 | if (fsloc && fsloc->locations_count > 0) { |
1192 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1193 | int i; | |
1194 | ||
ac34cdb0 | 1195 | seq_printf(m, ",%s=", loctype); |
93346919 MN |
1196 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); |
1197 | seq_putc(m, '@'); | |
1198 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1199 | for (i = 1; i < fsloc->locations_count; i++) { | |
1200 | seq_putc(m, ';'); | |
1201 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1202 | seq_putc(m, '@'); | |
1203 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1204 | } | |
1205 | } | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | static int e_show(struct seq_file *m, void *p) | |
1209 | { | |
1210 | struct cache_head *cp = p; | |
1211 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
f2c7ea10 | 1212 | struct cache_detail *cd = m->private; |
1da177e4 | 1213 | |
bc6f02e5 | 1214 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1215 | seq_puts(m, "# Version 1.1\n"); |
1216 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1217 | return 0; | |
1218 | } | |
1219 | ||
1da177e4 | 1220 | cache_get(&exp->h); |
f2c7ea10 | 1221 | if (cache_check(cd, &exp->h, NULL)) |
1da177e4 | 1222 | return 0; |
a09581f2 | 1223 | exp_put(exp); |
f2c7ea10 | 1224 | return svc_export_show(m, cd, cp); |
1da177e4 LT |
1225 | } |
1226 | ||
88e9d34c | 1227 | const struct seq_operations nfs_exports_op = { |
1da177e4 LT |
1228 | .start = e_start, |
1229 | .next = e_next, | |
1230 | .stop = e_stop, | |
1231 | .show = e_show, | |
1232 | }; | |
1233 | ||
1da177e4 LT |
1234 | /* |
1235 | * Initialize the exports module. | |
1236 | */ | |
dbf847ec | 1237 | int |
b89109be | 1238 | nfsd_export_init(struct net *net) |
1da177e4 | 1239 | { |
dbf847ec | 1240 | int rv; |
b3853e0e SK |
1241 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1242 | ||
b89109be | 1243 | dprintk("nfsd: initializing export module (net: %p).\n", net); |
1da177e4 | 1244 | |
b3853e0e SK |
1245 | nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net); |
1246 | if (IS_ERR(nn->svc_export_cache)) | |
1247 | return PTR_ERR(nn->svc_export_cache); | |
1248 | rv = cache_register_net(nn->svc_export_cache, net); | |
dbf847ec | 1249 | if (rv) |
b3853e0e SK |
1250 | goto destroy_export_cache; |
1251 | ||
e5f06f72 SK |
1252 | nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net); |
1253 | if (IS_ERR(nn->svc_expkey_cache)) { | |
1254 | rv = PTR_ERR(nn->svc_expkey_cache); | |
b3853e0e | 1255 | goto unregister_export_cache; |
e5f06f72 SK |
1256 | } |
1257 | rv = cache_register_net(nn->svc_expkey_cache, net); | |
1258 | if (rv) | |
1259 | goto destroy_expkey_cache; | |
b3853e0e | 1260 | return 0; |
1da177e4 | 1261 | |
e5f06f72 SK |
1262 | destroy_expkey_cache: |
1263 | cache_destroy_net(nn->svc_expkey_cache, net); | |
b3853e0e SK |
1264 | unregister_export_cache: |
1265 | cache_unregister_net(nn->svc_export_cache, net); | |
1266 | destroy_export_cache: | |
1267 | cache_destroy_net(nn->svc_export_cache, net); | |
1268 | return rv; | |
1da177e4 LT |
1269 | } |
1270 | ||
1271 | /* | |
1272 | * Flush exports table - called when last nfsd thread is killed | |
1273 | */ | |
1274 | void | |
b3853e0e | 1275 | nfsd_export_flush(struct net *net) |
1da177e4 | 1276 | { |
b3853e0e SK |
1277 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1278 | ||
e5f06f72 | 1279 | cache_purge(nn->svc_expkey_cache); |
b3853e0e | 1280 | cache_purge(nn->svc_export_cache); |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | /* | |
1284 | * Shutdown the exports module. | |
1285 | */ | |
1286 | void | |
b89109be | 1287 | nfsd_export_shutdown(struct net *net) |
1da177e4 | 1288 | { |
b3853e0e | 1289 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
1da177e4 | 1290 | |
b89109be | 1291 | dprintk("nfsd: shutting down export module (net: %p).\n", net); |
1da177e4 | 1292 | |
e5f06f72 | 1293 | cache_unregister_net(nn->svc_expkey_cache, net); |
b3853e0e | 1294 | cache_unregister_net(nn->svc_export_cache, net); |
e5f06f72 | 1295 | cache_destroy_net(nn->svc_expkey_cache, net); |
b3853e0e | 1296 | cache_destroy_net(nn->svc_export_cache, net); |
e5f06f72 | 1297 | svcauth_unix_purge(net); |
1da177e4 | 1298 | |
b89109be | 1299 | dprintk("nfsd: export shutdown complete (net: %p).\n", net); |
1da177e4 | 1300 | } |