1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * NFS exporting and validation. |
4 | * |
5 | * We maintain a list of clients, each of which has a list of |
6 | * exports. To export an fs to a given client, you first have |
7 | * to create the client entry with NFSCTL_ADDCLIENT, which |
8 | * creates a client control block and adds it to the hash |
9 | * table. Then, you call NFSCTL_EXPORT for each fs. |
10 | * |
11 | * |
12 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> |
13 | */ |
14 | |
15 | #include <linux/slab.h> |
16 | #include <linux/namei.h> |
17 | #include <linux/module.h> |
18 | #include <linux/exportfs.h> |
19 | #include <linux/sunrpc/svc_xprt.h> |
20 | |
21 | #include "nfsd.h" |
22 | #include "nfsfh.h" |
23 | #include "netns.h" |
24 | #include "pnfs.h" |
25 | #include "filecache.h" |
26 | #include "trace.h" |
27 | |
28 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT |
29 | |
30 | /* |
31 | * We have two caches. |
32 | * One maps client+vfsmnt+dentry to export options - the export map |
33 | * The other maps client+filehandle-fragment to export options. - the expkey map |
34 | * |
35 | * The export options are actually stored in the first map, and the |
36 | * second map contains a reference to the entry in the first map. |
37 | */ |
38 | |
39 | #define EXPKEY_HASHBITS 8 |
40 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) |
41 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) |
42 | |
43 | static void expkey_put(struct kref *ref) |
44 | { |
45 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
46 | |
47 | if (test_bit(CACHE_VALID, &key->h.flags) && |
48 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) |
49 | path_put(&key->ek_path); |
50 | auth_domain_put(item: key->ek_client); |
51 | kfree_rcu(key, ek_rcu); |
52 | } |
53 | |
54 | static int expkey_upcall(struct cache_detail *cd, struct cache_head *h) |
55 | { |
56 | return sunrpc_cache_pipe_upcall(detail: cd, h); |
57 | } |
58 | |
59 | static void expkey_request(struct cache_detail *cd, |
60 | struct cache_head *h, |
61 | char **bpp, int *blen) |
62 | { |
63 | /* client fsidtype \xfsid */ |
64 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); |
65 | char type[5]; |
66 | |
67 | qword_add(bpp, lp: blen, str: ek->ek_client->name); |
68 | snprintf(buf: type, size: 5, fmt: "%d" , ek->ek_fsidtype); |
69 | qword_add(bpp, lp: blen, str: type); |
70 | qword_addhex(bpp, lp: blen, buf: (char*)ek->ek_fsid, blen: key_len(type: ek->ek_fsidtype)); |
71 | (*bpp)[-1] = '\n'; |
72 | } |
73 | |
74 | static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
75 | struct svc_expkey *old); |
76 | static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *); |
77 | |
78 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
79 | { |
80 | /* client fsidtype fsid expiry [path] */ |
81 | char *buf; |
82 | int len; |
83 | struct auth_domain *dom = NULL; |
84 | int err; |
85 | int fsidtype; |
86 | char *ep; |
87 | struct svc_expkey key; |
88 | struct svc_expkey *ek = NULL; |
89 | |
90 | if (mesg[mlen - 1] != '\n') |
91 | return -EINVAL; |
92 | mesg[mlen-1] = 0; |
93 | |
94 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
95 | err = -ENOMEM; |
96 | if (!buf) |
97 | goto out; |
98 | |
99 | err = -EINVAL; |
100 | if (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0) |
101 | goto out; |
102 | |
103 | err = -ENOENT; |
104 | dom = auth_domain_find(name: buf); |
105 | if (!dom) |
106 | goto out; |
107 | dprintk("found domain %s\n" , buf); |
108 | |
109 | err = -EINVAL; |
110 | if (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0) |
111 | goto out; |
112 | fsidtype = simple_strtoul(buf, &ep, 10); |
113 | if (*ep) |
114 | goto out; |
115 | dprintk("found fsidtype %d\n" , fsidtype); |
116 | if (key_len(type: fsidtype)==0) /* invalid type */ |
117 | goto out; |
118 | if ((len=qword_get(bpp: &mesg, dest: buf, PAGE_SIZE)) <= 0) |
119 | goto out; |
120 | dprintk("found fsid length %d\n" , len); |
121 | if (len != key_len(type: fsidtype)) |
122 | goto out; |
123 | |
124 | /* OK, we seem to have a valid key */ |
125 | key.h.flags = 0; |
126 | err = get_expiry(bpp: &mesg, rvp: &key.h.expiry_time); |
127 | if (err) |
128 | goto out; |
129 | |
130 | key.ek_client = dom; |
131 | key.ek_fsidtype = fsidtype; |
132 | memcpy(key.ek_fsid, buf, len); |
133 | |
134 | ek = svc_expkey_lookup(cd, &key); |
135 | err = -ENOMEM; |
136 | if (!ek) |
137 | goto out; |
138 | |
139 | /* now we want a pathname, or empty meaning NEGATIVE */ |
140 | err = -EINVAL; |
141 | len = qword_get(bpp: &mesg, dest: buf, PAGE_SIZE); |
142 | if (len < 0) |
143 | goto out; |
144 | dprintk("Path seems to be <%s>\n" , buf); |
145 | err = 0; |
146 | if (len == 0) { |
147 | set_bit(nr: CACHE_NEGATIVE, addr: &key.h.flags); |
148 | ek = svc_expkey_update(cd, new: &key, old: ek); |
149 | if (ek) |
150 | trace_nfsd_expkey_update(key: ek, NULL); |
151 | else |
152 | err = -ENOMEM; |
153 | } else { |
154 | err = kern_path(buf, 0, &key.ek_path); |
155 | if (err) |
156 | goto out; |
157 | |
158 | dprintk("Found the path %s\n" , buf); |
159 | |
160 | ek = svc_expkey_update(cd, new: &key, old: ek); |
161 | if (ek) |
162 | trace_nfsd_expkey_update(key: ek, exp_path: buf); |
163 | else |
164 | err = -ENOMEM; |
165 | path_put(&key.ek_path); |
166 | } |
167 | cache_flush(); |
168 | out: |
169 | if (ek) |
170 | cache_put(h: &ek->h, cd); |
171 | if (dom) |
172 | auth_domain_put(item: dom); |
173 | kfree(objp: buf); |
174 | return err; |
175 | } |
176 | |
177 | static int expkey_show(struct seq_file *m, |
178 | struct cache_detail *cd, |
179 | struct cache_head *h) |
180 | { |
181 | struct svc_expkey *ek ; |
182 | int i; |
183 | |
184 | if (h ==NULL) { |
185 | seq_puts(m, s: "#domain fsidtype fsid [path]\n" ); |
186 | return 0; |
187 | } |
188 | ek = container_of(h, struct svc_expkey, h); |
189 | seq_printf(m, fmt: "%s %d 0x" , ek->ek_client->name, |
190 | ek->ek_fsidtype); |
191 | for (i=0; i < key_len(type: ek->ek_fsidtype)/4; i++) |
192 | seq_printf(m, fmt: "%08x" , ek->ek_fsid[i]); |
193 | if (test_bit(CACHE_VALID, &h->flags) && |
194 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
195 | seq_printf(m, fmt: " " ); |
196 | seq_path(m, &ek->ek_path, "\\ \t\n" ); |
197 | } |
198 | seq_printf(m, fmt: "\n" ); |
199 | return 0; |
200 | } |
201 | |
202 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
203 | { |
204 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
205 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); |
206 | |
207 | if (orig->ek_fsidtype != new->ek_fsidtype || |
208 | orig->ek_client != new->ek_client || |
209 | memcmp(p: orig->ek_fsid, q: new->ek_fsid, size: key_len(type: orig->ek_fsidtype)) != 0) |
210 | return 0; |
211 | return 1; |
212 | } |
213 | |
214 | static inline void expkey_init(struct cache_head *cnew, |
215 | struct cache_head *citem) |
216 | { |
217 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
218 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
219 | |
220 | kref_get(kref: &item->ek_client->ref); |
221 | new->ek_client = item->ek_client; |
222 | new->ek_fsidtype = item->ek_fsidtype; |
223 | |
224 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); |
225 | } |
226 | |
227 | static inline void expkey_update(struct cache_head *cnew, |
228 | struct cache_head *citem) |
229 | { |
230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); |
232 | |
233 | new->ek_path = item->ek_path; |
234 | path_get(&item->ek_path); |
235 | } |
236 | |
237 | static struct cache_head *expkey_alloc(void) |
238 | { |
239 | struct svc_expkey *i = kmalloc(size: sizeof(*i), GFP_KERNEL); |
240 | if (i) |
241 | return &i->h; |
242 | else |
243 | return NULL; |
244 | } |
245 | |
246 | static void expkey_flush(void) |
247 | { |
248 | /* |
249 | * Take the nfsd_mutex here to ensure that the file cache is not |
250 | * destroyed while we're in the middle of flushing. |
251 | */ |
252 | mutex_lock(&nfsd_mutex); |
253 | nfsd_file_cache_purge(current->nsproxy->net_ns); |
254 | mutex_unlock(lock: &nfsd_mutex); |
255 | } |
256 | |
257 | static const struct cache_detail svc_expkey_cache_template = { |
258 | .owner = THIS_MODULE, |
259 | .hash_size = EXPKEY_HASHMAX, |
260 | .name = "nfsd.fh" , |
261 | .cache_put = expkey_put, |
262 | .cache_upcall = expkey_upcall, |
263 | .cache_request = expkey_request, |
264 | .cache_parse = expkey_parse, |
265 | .cache_show = expkey_show, |
266 | .match = expkey_match, |
267 | .init = expkey_init, |
268 | .update = expkey_update, |
269 | .alloc = expkey_alloc, |
270 | .flush = expkey_flush, |
271 | }; |
272 | |
273 | static int |
274 | svc_expkey_hash(struct svc_expkey *item) |
275 | { |
276 | int hash = item->ek_fsidtype; |
277 | char * cp = (char*)item->ek_fsid; |
278 | int len = key_len(type: item->ek_fsidtype); |
279 | |
280 | hash ^= hash_mem(buf: cp, length: len, EXPKEY_HASHBITS); |
281 | hash ^= hash_ptr(ptr: item->ek_client, EXPKEY_HASHBITS); |
282 | hash &= EXPKEY_HASHMASK; |
283 | return hash; |
284 | } |
285 | |
286 | static struct svc_expkey * |
287 | svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item) |
288 | { |
289 | struct cache_head *ch; |
290 | int hash = svc_expkey_hash(item); |
291 | |
292 | ch = sunrpc_cache_lookup_rcu(detail: cd, key: &item->h, hash); |
293 | if (ch) |
294 | return container_of(ch, struct svc_expkey, h); |
295 | else |
296 | return NULL; |
297 | } |
298 | |
299 | static struct svc_expkey * |
300 | svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new, |
301 | struct svc_expkey *old) |
302 | { |
303 | struct cache_head *ch; |
304 | int hash = svc_expkey_hash(item: new); |
305 | |
306 | ch = sunrpc_cache_update(detail: cd, new: &new->h, old: &old->h, hash); |
307 | if (ch) |
308 | return container_of(ch, struct svc_expkey, h); |
309 | else |
310 | return NULL; |
311 | } |
312 | |
313 | |
314 | #define EXPORT_HASHBITS 8 |
315 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) |
316 | |
317 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
318 | { |
319 | struct nfsd4_fs_location *locations = fsloc->locations; |
320 | int i; |
321 | |
322 | if (!locations) |
323 | return; |
324 | |
325 | for (i = 0; i < fsloc->locations_count; i++) { |
326 | kfree(objp: locations[i].path); |
327 | kfree(objp: locations[i].hosts); |
328 | } |
329 | |
330 | kfree(objp: locations); |
331 | fsloc->locations = NULL; |
332 | } |
333 | |
334 | static int export_stats_init(struct export_stats *stats) |
335 | { |
336 | stats->start_time = ktime_get_seconds(); |
337 | return nfsd_percpu_counters_init(counters: stats->counter, num: EXP_STATS_COUNTERS_NUM); |
338 | } |
339 | |
340 | static void export_stats_reset(struct export_stats *stats) |
341 | { |
342 | if (stats) |
343 | nfsd_percpu_counters_reset(counters: stats->counter, |
344 | num: EXP_STATS_COUNTERS_NUM); |
345 | } |
346 | |
347 | static void export_stats_destroy(struct export_stats *stats) |
348 | { |
349 | if (stats) |
350 | nfsd_percpu_counters_destroy(counters: stats->counter, |
351 | num: EXP_STATS_COUNTERS_NUM); |
352 | } |
353 | |
354 | static void svc_export_put(struct kref *ref) |
355 | { |
356 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
357 | path_put(&exp->ex_path); |
358 | auth_domain_put(item: exp->ex_client); |
359 | nfsd4_fslocs_free(fsloc: &exp->ex_fslocs); |
360 | export_stats_destroy(stats: exp->ex_stats); |
361 | kfree(objp: exp->ex_stats); |
362 | kfree(objp: exp->ex_uuid); |
363 | kfree_rcu(exp, ex_rcu); |
364 | } |
365 | |
366 | static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h) |
367 | { |
368 | return sunrpc_cache_pipe_upcall(detail: cd, h); |
369 | } |
370 | |
371 | static void svc_export_request(struct cache_detail *cd, |
372 | struct cache_head *h, |
373 | char **bpp, int *blen) |
374 | { |
375 | /* client path */ |
376 | struct svc_export *exp = container_of(h, struct svc_export, h); |
377 | char *pth; |
378 | |
379 | qword_add(bpp, lp: blen, str: exp->ex_client->name); |
380 | pth = d_path(&exp->ex_path, *bpp, *blen); |
381 | if (IS_ERR(ptr: pth)) { |
382 | /* is this correct? */ |
383 | (*bpp)[0] = '\n'; |
384 | return; |
385 | } |
386 | qword_add(bpp, lp: blen, str: pth); |
387 | (*bpp)[-1] = '\n'; |
388 | } |
389 | |
390 | static struct svc_export *svc_export_update(struct svc_export *new, |
391 | struct svc_export *old); |
392 | static struct svc_export *svc_export_lookup(struct svc_export *); |
393 | |
394 | static int check_export(struct path *path, int *flags, unsigned char *uuid) |
395 | { |
396 | struct inode *inode = d_inode(dentry: path->dentry); |
397 | |
398 | /* |
399 | * We currently export only dirs, regular files, and (for v4 |
400 | * pseudoroot) symlinks. |
401 | */ |
402 | if (!S_ISDIR(inode->i_mode) && |
403 | !S_ISLNK(inode->i_mode) && |
404 | !S_ISREG(inode->i_mode)) |
405 | return -ENOTDIR; |
406 | |
407 | /* |
408 | * Mountd should never pass down a writeable V4ROOT export, but, |
409 | * just to make sure: |
410 | */ |
411 | if (*flags & NFSEXP_V4ROOT) |
412 | *flags |= NFSEXP_READONLY; |
413 | |
414 | /* There are two requirements on a filesystem to be exportable. |
415 | * 1: We must be able to identify the filesystem from a number. |
416 | * either a device number (so FS_REQUIRES_DEV needed) |
417 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
418 | * 2: We must be able to find an inode from a filehandle. |
419 | * This means that s_export_op must be set. |
420 | * 3: We must not currently be on an idmapped mount. |
421 | */ |
422 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && |
423 | !(*flags & NFSEXP_FSID) && |
424 | uuid == NULL) { |
425 | dprintk("exp_export: export of non-dev fs without fsid\n" ); |
426 | return -EINVAL; |
427 | } |
428 | |
429 | if (!exportfs_can_decode_fh(nop: inode->i_sb->s_export_op)) { |
430 | dprintk("exp_export: export of invalid fs type.\n" ); |
431 | return -EINVAL; |
432 | } |
433 | |
434 | if (is_idmapped_mnt(mnt: path->mnt)) { |
435 | dprintk("exp_export: export of idmapped mounts not yet supported.\n" ); |
436 | return -EINVAL; |
437 | } |
438 | |
439 | if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK && |
440 | !(*flags & NFSEXP_NOSUBTREECHECK)) { |
441 | dprintk("%s: %s does not support subtree checking!\n" , |
442 | __func__, inode->i_sb->s_type->name); |
443 | return -EINVAL; |
444 | } |
445 | return 0; |
446 | } |
447 | |
448 | #ifdef CONFIG_NFSD_V4 |
449 | |
450 | static int |
451 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) |
452 | { |
453 | int len; |
454 | int migrated, i, err; |
455 | |
456 | /* more than one fsloc */ |
457 | if (fsloc->locations) |
458 | return -EINVAL; |
459 | |
460 | /* listsize */ |
461 | err = get_uint(bpp: mesg, anint: &fsloc->locations_count); |
462 | if (err) |
463 | return err; |
464 | if (fsloc->locations_count > MAX_FS_LOCATIONS) |
465 | return -EINVAL; |
466 | if (fsloc->locations_count == 0) |
467 | return 0; |
468 | |
469 | fsloc->locations = kcalloc(n: fsloc->locations_count, |
470 | size: sizeof(struct nfsd4_fs_location), |
471 | GFP_KERNEL); |
472 | if (!fsloc->locations) |
473 | return -ENOMEM; |
474 | for (i=0; i < fsloc->locations_count; i++) { |
475 | /* colon separated host list */ |
476 | err = -EINVAL; |
477 | len = qword_get(bpp: mesg, dest: buf, PAGE_SIZE); |
478 | if (len <= 0) |
479 | goto out_free_all; |
480 | err = -ENOMEM; |
481 | fsloc->locations[i].hosts = kstrdup(s: buf, GFP_KERNEL); |
482 | if (!fsloc->locations[i].hosts) |
483 | goto out_free_all; |
484 | err = -EINVAL; |
485 | /* slash separated path component list */ |
486 | len = qword_get(bpp: mesg, dest: buf, PAGE_SIZE); |
487 | if (len <= 0) |
488 | goto out_free_all; |
489 | err = -ENOMEM; |
490 | fsloc->locations[i].path = kstrdup(s: buf, GFP_KERNEL); |
491 | if (!fsloc->locations[i].path) |
492 | goto out_free_all; |
493 | } |
494 | /* migrated */ |
495 | err = get_int(bpp: mesg, anint: &migrated); |
496 | if (err) |
497 | goto out_free_all; |
498 | err = -EINVAL; |
499 | if (migrated < 0 || migrated > 1) |
500 | goto out_free_all; |
501 | fsloc->migrated = migrated; |
502 | return 0; |
503 | out_free_all: |
504 | nfsd4_fslocs_free(fsloc); |
505 | return err; |
506 | } |
507 | |
508 | static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp) |
509 | { |
510 | struct exp_flavor_info *f; |
511 | u32 listsize; |
512 | int err; |
513 | |
514 | /* more than one secinfo */ |
515 | if (exp->ex_nflavors) |
516 | return -EINVAL; |
517 | |
518 | err = get_uint(bpp: mesg, anint: &listsize); |
519 | if (err) |
520 | return err; |
521 | if (listsize > MAX_SECINFO_LIST) |
522 | return -EINVAL; |
523 | |
524 | for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) { |
525 | err = get_uint(bpp: mesg, anint: &f->pseudoflavor); |
526 | if (err) |
527 | return err; |
528 | /* |
529 | * XXX: It would be nice to also check whether this |
530 | * pseudoflavor is supported, so we can discover the |
531 | * problem at export time instead of when a client fails |
532 | * to authenticate. |
533 | */ |
534 | err = get_uint(bpp: mesg, anint: &f->flags); |
535 | if (err) |
536 | return err; |
537 | /* Only some flags are allowed to differ between flavors: */ |
538 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) |
539 | return -EINVAL; |
540 | } |
541 | exp->ex_nflavors = listsize; |
542 | return 0; |
543 | } |
544 | |
545 | #else /* CONFIG_NFSD_V4 */ |
546 | static inline int |
547 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} |
548 | static inline int |
549 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } |
550 | #endif |
551 | |
552 | static int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp) |
553 | { |
554 | unsigned int i, mode, listsize; |
555 | int err; |
556 | |
557 | err = get_uint(bpp: mesg, anint: &listsize); |
558 | if (err) |
559 | return err; |
560 | if (listsize > NFSEXP_XPRTSEC_NUM) |
561 | return -EINVAL; |
562 | |
563 | exp->ex_xprtsec_modes = 0; |
564 | for (i = 0; i < listsize; i++) { |
565 | err = get_uint(bpp: mesg, anint: &mode); |
566 | if (err) |
567 | return err; |
568 | if (mode > NFSEXP_XPRTSEC_MTLS) |
569 | return -EINVAL; |
570 | exp->ex_xprtsec_modes |= mode; |
571 | } |
572 | return 0; |
573 | } |
574 | |
575 | static inline int |
576 | nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid) |
577 | { |
578 | int len; |
579 | |
580 | /* more than one uuid */ |
581 | if (*puuid) |
582 | return -EINVAL; |
583 | |
584 | /* expect a 16 byte uuid encoded as \xXXXX... */ |
585 | len = qword_get(bpp: mesg, dest: buf, PAGE_SIZE); |
586 | if (len != EX_UUID_LEN) |
587 | return -EINVAL; |
588 | |
589 | *puuid = kmemdup(p: buf, EX_UUID_LEN, GFP_KERNEL); |
590 | if (*puuid == NULL) |
591 | return -ENOMEM; |
592 | |
593 | return 0; |
594 | } |
595 | |
596 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
597 | { |
598 | /* client path expiry [flags anonuid anongid fsid] */ |
599 | char *buf; |
600 | int err; |
601 | struct auth_domain *dom = NULL; |
602 | struct svc_export exp = {}, *expp; |
603 | int an_int; |
604 | |
605 | if (mesg[mlen-1] != '\n') |
606 | return -EINVAL; |
607 | mesg[mlen-1] = 0; |
608 | |
609 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
610 | if (!buf) |
611 | return -ENOMEM; |
612 | |
613 | /* client */ |
614 | err = -EINVAL; |
615 | if (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0) |
616 | goto out; |
617 | |
618 | err = -ENOENT; |
619 | dom = auth_domain_find(name: buf); |
620 | if (!dom) |
621 | goto out; |
622 | |
623 | /* path */ |
624 | err = -EINVAL; |
625 | if (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0) |
626 | goto out1; |
627 | |
628 | err = kern_path(buf, 0, &exp.ex_path); |
629 | if (err) |
630 | goto out1; |
631 | |
632 | exp.ex_client = dom; |
633 | exp.cd = cd; |
634 | exp.ex_devid_map = NULL; |
635 | exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL; |
636 | |
637 | /* expiry */ |
638 | err = get_expiry(bpp: &mesg, rvp: &exp.h.expiry_time); |
639 | if (err) |
640 | goto out3; |
641 | |
642 | /* flags */ |
643 | err = get_int(bpp: &mesg, anint: &an_int); |
644 | if (err == -ENOENT) { |
645 | err = 0; |
646 | set_bit(nr: CACHE_NEGATIVE, addr: &exp.h.flags); |
647 | } else { |
648 | if (err || an_int < 0) |
649 | goto out3; |
650 | exp.ex_flags= an_int; |
651 | |
652 | /* anon uid */ |
653 | err = get_int(bpp: &mesg, anint: &an_int); |
654 | if (err) |
655 | goto out3; |
656 | exp.ex_anon_uid= make_kuid(current_user_ns(), uid: an_int); |
657 | |
658 | /* anon gid */ |
659 | err = get_int(bpp: &mesg, anint: &an_int); |
660 | if (err) |
661 | goto out3; |
662 | exp.ex_anon_gid= make_kgid(current_user_ns(), gid: an_int); |
663 | |
664 | /* fsid */ |
665 | err = get_int(bpp: &mesg, anint: &an_int); |
666 | if (err) |
667 | goto out3; |
668 | exp.ex_fsid = an_int; |
669 | |
670 | while (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) > 0) { |
671 | if (strcmp(buf, "fsloc" ) == 0) |
672 | err = fsloc_parse(mesg: &mesg, buf, fsloc: &exp.ex_fslocs); |
673 | else if (strcmp(buf, "uuid" ) == 0) |
674 | err = nfsd_uuid_parse(mesg: &mesg, buf, puuid: &exp.ex_uuid); |
675 | else if (strcmp(buf, "secinfo" ) == 0) |
676 | err = secinfo_parse(mesg: &mesg, buf, exp: &exp); |
677 | else if (strcmp(buf, "xprtsec" ) == 0) |
678 | err = xprtsec_parse(mesg: &mesg, buf, exp: &exp); |
679 | else |
680 | /* quietly ignore unknown words and anything |
681 | * following. Newer user-space can try to set |
682 | * new values, then see what the result was. |
683 | */ |
684 | break; |
685 | if (err) |
686 | goto out4; |
687 | } |
688 | |
689 | err = check_export(path: &exp.ex_path, flags: &exp.ex_flags, uuid: exp.ex_uuid); |
690 | if (err) |
691 | goto out4; |
692 | |
693 | /* |
694 | * No point caching this if it would immediately expire. |
695 | * Also, this protects exportfs's dummy export from the |
696 | * anon_uid/anon_gid checks: |
697 | */ |
698 | if (exp.h.expiry_time < seconds_since_boot()) |
699 | goto out4; |
700 | /* |
701 | * For some reason exportfs has been passing down an |
702 | * invalid (-1) uid & gid on the "dummy" export which it |
703 | * uses to test export support. To make sure exportfs |
704 | * sees errors from check_export we therefore need to |
705 | * delay these checks till after check_export: |
706 | */ |
707 | err = -EINVAL; |
708 | if (!uid_valid(uid: exp.ex_anon_uid)) |
709 | goto out4; |
710 | if (!gid_valid(gid: exp.ex_anon_gid)) |
711 | goto out4; |
712 | err = 0; |
713 | |
714 | nfsd4_setup_layout_type(exp: &exp); |
715 | } |
716 | |
717 | expp = svc_export_lookup(&exp); |
718 | if (!expp) { |
719 | err = -ENOMEM; |
720 | goto out4; |
721 | } |
722 | expp = svc_export_update(new: &exp, old: expp); |
723 | if (expp) { |
724 | trace_nfsd_export_update(key: expp); |
725 | cache_flush(); |
726 | exp_put(exp: expp); |
727 | } else |
728 | err = -ENOMEM; |
729 | out4: |
730 | nfsd4_fslocs_free(fsloc: &exp.ex_fslocs); |
731 | kfree(objp: exp.ex_uuid); |
732 | out3: |
733 | path_put(&exp.ex_path); |
734 | out1: |
735 | auth_domain_put(item: dom); |
736 | out: |
737 | kfree(objp: buf); |
738 | return err; |
739 | } |
740 | |
741 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
742 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs); |
743 | static void show_secinfo(struct seq_file *m, struct svc_export *exp); |
744 | |
745 | static int is_export_stats_file(struct seq_file *m) |
746 | { |
747 | /* |
748 | * The export_stats file uses the same ops as the exports file. |
749 | * We use the file's name to determine the reported info per export. |
750 | * There is no rename in nsfdfs, so d_name.name is stable. |
751 | */ |
752 | return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats" ); |
753 | } |
754 | |
755 | static int svc_export_show(struct seq_file *m, |
756 | struct cache_detail *cd, |
757 | struct cache_head *h) |
758 | { |
759 | struct svc_export *exp; |
760 | bool export_stats = is_export_stats_file(m); |
761 | |
762 | if (h == NULL) { |
763 | if (export_stats) |
764 | seq_puts(m, s: "#path domain start-time\n#\tstats\n" ); |
765 | else |
766 | seq_puts(m, s: "#path domain(flags)\n" ); |
767 | return 0; |
768 | } |
769 | exp = container_of(h, struct svc_export, h); |
770 | seq_path(m, &exp->ex_path, " \t\n\\" ); |
771 | seq_putc(m, c: '\t'); |
772 | seq_escape(m, s: exp->ex_client->name, esc: " \t\n\\" ); |
773 | if (export_stats) { |
774 | struct percpu_counter *counter = exp->ex_stats->counter; |
775 | |
776 | seq_printf(m, fmt: "\t%lld\n" , exp->ex_stats->start_time); |
777 | seq_printf(m, fmt: "\tfh_stale: %lld\n" , |
778 | percpu_counter_sum_positive(fbc: &counter[EXP_STATS_FH_STALE])); |
779 | seq_printf(m, fmt: "\tio_read: %lld\n" , |
780 | percpu_counter_sum_positive(fbc: &counter[EXP_STATS_IO_READ])); |
781 | seq_printf(m, fmt: "\tio_write: %lld\n" , |
782 | percpu_counter_sum_positive(fbc: &counter[EXP_STATS_IO_WRITE])); |
783 | seq_putc(m, c: '\n'); |
784 | return 0; |
785 | } |
786 | seq_putc(m, c: '('); |
787 | if (test_bit(CACHE_VALID, &h->flags) && |
788 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
789 | exp_flags(m, flag: exp->ex_flags, fsid: exp->ex_fsid, |
790 | anonu: exp->ex_anon_uid, anong: exp->ex_anon_gid, fslocs: &exp->ex_fslocs); |
791 | if (exp->ex_uuid) { |
792 | int i; |
793 | seq_puts(m, s: ",uuid=" ); |
794 | for (i = 0; i < EX_UUID_LEN; i++) { |
795 | if ((i&3) == 0 && i) |
796 | seq_putc(m, c: ':'); |
797 | seq_printf(m, fmt: "%02x" , exp->ex_uuid[i]); |
798 | } |
799 | } |
800 | show_secinfo(m, exp); |
801 | } |
802 | seq_puts(m, s: ")\n" ); |
803 | return 0; |
804 | } |
805 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
806 | { |
807 | struct svc_export *orig = container_of(a, struct svc_export, h); |
808 | struct svc_export *new = container_of(b, struct svc_export, h); |
809 | return orig->ex_client == new->ex_client && |
810 | path_equal(path1: &orig->ex_path, path2: &new->ex_path); |
811 | } |
812 | |
813 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) |
814 | { |
815 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
816 | struct svc_export *item = container_of(citem, struct svc_export, h); |
817 | |
818 | kref_get(kref: &item->ex_client->ref); |
819 | new->ex_client = item->ex_client; |
820 | new->ex_path = item->ex_path; |
821 | path_get(&item->ex_path); |
822 | new->ex_fslocs.locations = NULL; |
823 | new->ex_fslocs.locations_count = 0; |
824 | new->ex_fslocs.migrated = 0; |
825 | new->ex_layout_types = 0; |
826 | new->ex_uuid = NULL; |
827 | new->cd = item->cd; |
828 | export_stats_reset(stats: new->ex_stats); |
829 | } |
830 | |
831 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
832 | { |
833 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
834 | struct svc_export *item = container_of(citem, struct svc_export, h); |
835 | int i; |
836 | |
837 | new->ex_flags = item->ex_flags; |
838 | new->ex_anon_uid = item->ex_anon_uid; |
839 | new->ex_anon_gid = item->ex_anon_gid; |
840 | new->ex_fsid = item->ex_fsid; |
841 | new->ex_devid_map = item->ex_devid_map; |
842 | item->ex_devid_map = NULL; |
843 | new->ex_uuid = item->ex_uuid; |
844 | item->ex_uuid = NULL; |
845 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
846 | item->ex_fslocs.locations = NULL; |
847 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; |
848 | item->ex_fslocs.locations_count = 0; |
849 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; |
850 | item->ex_fslocs.migrated = 0; |
851 | new->ex_layout_types = item->ex_layout_types; |
852 | new->ex_nflavors = item->ex_nflavors; |
853 | for (i = 0; i < MAX_SECINFO_LIST; i++) { |
854 | new->ex_flavors[i] = item->ex_flavors[i]; |
855 | } |
856 | new->ex_xprtsec_modes = item->ex_xprtsec_modes; |
857 | } |
858 | |
859 | static struct cache_head *svc_export_alloc(void) |
860 | { |
861 | struct svc_export *i = kmalloc(size: sizeof(*i), GFP_KERNEL); |
862 | if (!i) |
863 | return NULL; |
864 | |
865 | i->ex_stats = kmalloc(size: sizeof(*(i->ex_stats)), GFP_KERNEL); |
866 | if (!i->ex_stats) { |
867 | kfree(objp: i); |
868 | return NULL; |
869 | } |
870 | |
871 | if (export_stats_init(stats: i->ex_stats)) { |
872 | kfree(objp: i->ex_stats); |
873 | kfree(objp: i); |
874 | return NULL; |
875 | } |
876 | |
877 | return &i->h; |
878 | } |
879 | |
880 | static const struct cache_detail svc_export_cache_template = { |
881 | .owner = THIS_MODULE, |
882 | .hash_size = EXPORT_HASHMAX, |
883 | .name = "nfsd.export" , |
884 | .cache_put = svc_export_put, |
885 | .cache_upcall = svc_export_upcall, |
886 | .cache_request = svc_export_request, |
887 | .cache_parse = svc_export_parse, |
888 | .cache_show = svc_export_show, |
889 | .match = svc_export_match, |
890 | .init = svc_export_init, |
891 | .update = export_update, |
892 | .alloc = svc_export_alloc, |
893 | }; |
894 | |
895 | static int |
896 | svc_export_hash(struct svc_export *exp) |
897 | { |
898 | int hash; |
899 | |
900 | hash = hash_ptr(ptr: exp->ex_client, EXPORT_HASHBITS); |
901 | hash ^= hash_ptr(ptr: exp->ex_path.dentry, EXPORT_HASHBITS); |
902 | hash ^= hash_ptr(ptr: exp->ex_path.mnt, EXPORT_HASHBITS); |
903 | return hash; |
904 | } |
905 | |
906 | static struct svc_export * |
907 | svc_export_lookup(struct svc_export *exp) |
908 | { |
909 | struct cache_head *ch; |
910 | int hash = svc_export_hash(exp); |
911 | |
912 | ch = sunrpc_cache_lookup_rcu(detail: exp->cd, key: &exp->h, hash); |
913 | if (ch) |
914 | return container_of(ch, struct svc_export, h); |
915 | else |
916 | return NULL; |
917 | } |
918 | |
919 | static struct svc_export * |
920 | svc_export_update(struct svc_export *new, struct svc_export *old) |
921 | { |
922 | struct cache_head *ch; |
923 | int hash = svc_export_hash(exp: old); |
924 | |
925 | ch = sunrpc_cache_update(detail: old->cd, new: &new->h, old: &old->h, hash); |
926 | if (ch) |
927 | return container_of(ch, struct svc_export, h); |
928 | else |
929 | return NULL; |
930 | } |
931 | |
932 | |
933 | static struct svc_expkey * |
934 | exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type, |
935 | u32 *fsidv, struct cache_req *reqp) |
936 | { |
937 | struct svc_expkey key, *ek; |
938 | int err; |
939 | |
940 | if (!clp) |
941 | return ERR_PTR(error: -ENOENT); |
942 | |
943 | key.ek_client = clp; |
944 | key.ek_fsidtype = fsid_type; |
945 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); |
946 | |
947 | ek = svc_expkey_lookup(cd, item: &key); |
948 | if (ek == NULL) |
949 | return ERR_PTR(error: -ENOMEM); |
950 | err = cache_check(detail: cd, h: &ek->h, rqstp: reqp); |
951 | if (err) { |
952 | trace_nfsd_exp_find_key(key: &key, status: err); |
953 | return ERR_PTR(error: err); |
954 | } |
955 | return ek; |
956 | } |
957 | |
958 | static struct svc_export * |
959 | exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp, |
960 | const struct path *path, struct cache_req *reqp) |
961 | { |
962 | struct svc_export *exp, key; |
963 | int err; |
964 | |
965 | if (!clp) |
966 | return ERR_PTR(error: -ENOENT); |
967 | |
968 | key.ex_client = clp; |
969 | key.ex_path = *path; |
970 | key.cd = cd; |
971 | |
972 | exp = svc_export_lookup(exp: &key); |
973 | if (exp == NULL) |
974 | return ERR_PTR(error: -ENOMEM); |
975 | err = cache_check(detail: cd, h: &exp->h, rqstp: reqp); |
976 | if (err) { |
977 | trace_nfsd_exp_get_by_name(key: &key, status: err); |
978 | return ERR_PTR(error: err); |
979 | } |
980 | return exp; |
981 | } |
982 | |
983 | /* |
984 | * Find the export entry for a given dentry. |
985 | */ |
986 | static struct svc_export * |
987 | exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path) |
988 | { |
989 | struct dentry *saved = dget(dentry: path->dentry); |
990 | struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL); |
991 | |
992 | while (PTR_ERR(ptr: exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
993 | struct dentry *parent = dget_parent(dentry: path->dentry); |
994 | dput(path->dentry); |
995 | path->dentry = parent; |
996 | exp = exp_get_by_name(cd, clp, path, NULL); |
997 | } |
998 | dput(path->dentry); |
999 | path->dentry = saved; |
1000 | return exp; |
1001 | } |
1002 | |
1003 | |
1004 | |
1005 | /* |
1006 | * Obtain the root fh on behalf of a client. |
1007 | * This could be done in user space, but I feel that it adds some safety |
1008 | * since its harder to fool a kernel module than a user space program. |
1009 | */ |
1010 | int |
1011 | exp_rootfh(struct net *net, struct auth_domain *clp, char *name, |
1012 | struct knfsd_fh *f, int maxsize) |
1013 | { |
1014 | struct svc_export *exp; |
1015 | struct path path; |
1016 | struct inode *inode; |
1017 | struct svc_fh fh; |
1018 | int err; |
1019 | struct nfsd_net *nn = net_generic(net, id: nfsd_net_id); |
1020 | struct cache_detail *cd = nn->svc_export_cache; |
1021 | |
1022 | err = -EPERM; |
1023 | /* NB: we probably ought to check that it's NUL-terminated */ |
1024 | if (kern_path(name, 0, &path)) { |
1025 | printk("nfsd: exp_rootfh path not found %s" , name); |
1026 | return err; |
1027 | } |
1028 | inode = d_inode(dentry: path.dentry); |
1029 | |
1030 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n" , |
1031 | name, path.dentry, clp->name, |
1032 | inode->i_sb->s_id, inode->i_ino); |
1033 | exp = exp_parent(cd, clp, path: &path); |
1034 | if (IS_ERR(ptr: exp)) { |
1035 | err = PTR_ERR(ptr: exp); |
1036 | goto out; |
1037 | } |
1038 | |
1039 | /* |
1040 | * fh must be initialized before calling fh_compose |
1041 | */ |
1042 | fh_init(fhp: &fh, maxsize); |
1043 | if (fh_compose(&fh, exp, path.dentry, NULL)) |
1044 | err = -EINVAL; |
1045 | else |
1046 | err = 0; |
1047 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); |
1048 | fh_put(&fh); |
1049 | exp_put(exp); |
1050 | out: |
1051 | path_put(&path); |
1052 | return err; |
1053 | } |
1054 | |
1055 | static struct svc_export *exp_find(struct cache_detail *cd, |
1056 | struct auth_domain *clp, int fsid_type, |
1057 | u32 *fsidv, struct cache_req *reqp) |
1058 | { |
1059 | struct svc_export *exp; |
1060 | struct nfsd_net *nn = net_generic(net: cd->net, id: nfsd_net_id); |
1061 | struct svc_expkey *ek = exp_find_key(cd: nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp); |
1062 | if (IS_ERR(ptr: ek)) |
1063 | return ERR_CAST(ptr: ek); |
1064 | |
1065 | exp = exp_get_by_name(cd, clp, path: &ek->ek_path, reqp); |
1066 | cache_put(h: &ek->h, cd: nn->svc_expkey_cache); |
1067 | |
1068 | if (IS_ERR(ptr: exp)) |
1069 | return ERR_CAST(ptr: exp); |
1070 | return exp; |
1071 | } |
1072 | |
1073 | __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp) |
1074 | { |
1075 | struct exp_flavor_info *f, *end = exp->ex_flavors + exp->ex_nflavors; |
1076 | struct svc_xprt *xprt = rqstp->rq_xprt; |
1077 | |
1078 | if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) { |
1079 | if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags)) |
1080 | goto ok; |
1081 | } |
1082 | if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) { |
1083 | if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) && |
1084 | !test_bit(XPT_PEER_AUTH, &xprt->xpt_flags)) |
1085 | goto ok; |
1086 | } |
1087 | if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) { |
1088 | if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) && |
1089 | test_bit(XPT_PEER_AUTH, &xprt->xpt_flags)) |
1090 | goto ok; |
1091 | } |
1092 | goto denied; |
1093 | |
1094 | ok: |
1095 | /* legacy gss-only clients are always OK: */ |
1096 | if (exp->ex_client == rqstp->rq_gssclient) |
1097 | return 0; |
1098 | /* ip-address based client; check sec= export option: */ |
1099 | for (f = exp->ex_flavors; f < end; f++) { |
1100 | if (f->pseudoflavor == rqstp->rq_cred.cr_flavor) |
1101 | return 0; |
1102 | } |
1103 | /* defaults in absence of sec= options: */ |
1104 | if (exp->ex_nflavors == 0) { |
1105 | if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL || |
1106 | rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX) |
1107 | return 0; |
1108 | } |
1109 | |
1110 | /* If the compound op contains a spo_must_allowed op, |
1111 | * it will be sent with integrity/protection which |
1112 | * will have to be expressly allowed on mounts that |
1113 | * don't support it |
1114 | */ |
1115 | |
1116 | if (nfsd4_spo_must_allow(rqstp)) |
1117 | return 0; |
1118 | |
1119 | denied: |
1120 | return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec; |
1121 | } |
1122 | |
1123 | /* |
1124 | * Uses rq_client and rq_gssclient to find an export; uses rq_client (an |
1125 | * auth_unix client) if it's available and has secinfo information; |
1126 | * otherwise, will try to use rq_gssclient. |
1127 | * |
1128 | * Called from functions that handle requests; functions that do work on |
1129 | * behalf of mountd are passed a single client name to use, and should |
1130 | * use exp_get_by_name() or exp_find(). |
1131 | */ |
1132 | struct svc_export * |
1133 | rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path) |
1134 | { |
1135 | struct svc_export *gssexp, *exp = ERR_PTR(error: -ENOENT); |
1136 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id); |
1137 | struct cache_detail *cd = nn->svc_export_cache; |
1138 | |
1139 | if (rqstp->rq_client == NULL) |
1140 | goto gss; |
1141 | |
1142 | /* First try the auth_unix client: */ |
1143 | exp = exp_get_by_name(cd, clp: rqstp->rq_client, path, reqp: &rqstp->rq_chandle); |
1144 | if (PTR_ERR(ptr: exp) == -ENOENT) |
1145 | goto gss; |
1146 | if (IS_ERR(ptr: exp)) |
1147 | return exp; |
1148 | /* If it has secinfo, assume there are no gss/... clients */ |
1149 | if (exp->ex_nflavors > 0) |
1150 | return exp; |
1151 | gss: |
1152 | /* Otherwise, try falling back on gss client */ |
1153 | if (rqstp->rq_gssclient == NULL) |
1154 | return exp; |
1155 | gssexp = exp_get_by_name(cd, clp: rqstp->rq_gssclient, path, reqp: &rqstp->rq_chandle); |
1156 | if (PTR_ERR(ptr: gssexp) == -ENOENT) |
1157 | return exp; |
1158 | if (!IS_ERR(ptr: exp)) |
1159 | exp_put(exp); |
1160 | return gssexp; |
1161 | } |
1162 | |
1163 | struct svc_export * |
1164 | rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv) |
1165 | { |
1166 | struct svc_export *gssexp, *exp = ERR_PTR(error: -ENOENT); |
1167 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id); |
1168 | struct cache_detail *cd = nn->svc_export_cache; |
1169 | |
1170 | if (rqstp->rq_client == NULL) |
1171 | goto gss; |
1172 | |
1173 | /* First try the auth_unix client: */ |
1174 | exp = exp_find(cd, clp: rqstp->rq_client, fsid_type, |
1175 | fsidv, reqp: &rqstp->rq_chandle); |
1176 | if (PTR_ERR(ptr: exp) == -ENOENT) |
1177 | goto gss; |
1178 | if (IS_ERR(ptr: exp)) |
1179 | return exp; |
1180 | /* If it has secinfo, assume there are no gss/... clients */ |
1181 | if (exp->ex_nflavors > 0) |
1182 | return exp; |
1183 | gss: |
1184 | /* Otherwise, try falling back on gss client */ |
1185 | if (rqstp->rq_gssclient == NULL) |
1186 | return exp; |
1187 | gssexp = exp_find(cd, clp: rqstp->rq_gssclient, fsid_type, fsidv, |
1188 | reqp: &rqstp->rq_chandle); |
1189 | if (PTR_ERR(ptr: gssexp) == -ENOENT) |
1190 | return exp; |
1191 | if (!IS_ERR(ptr: exp)) |
1192 | exp_put(exp); |
1193 | return gssexp; |
1194 | } |
1195 | |
1196 | struct svc_export * |
1197 | rqst_exp_parent(struct svc_rqst *rqstp, struct path *path) |
1198 | { |
1199 | struct dentry *saved = dget(dentry: path->dentry); |
1200 | struct svc_export *exp = rqst_exp_get_by_name(rqstp, path); |
1201 | |
1202 | while (PTR_ERR(ptr: exp) == -ENOENT && !IS_ROOT(path->dentry)) { |
1203 | struct dentry *parent = dget_parent(dentry: path->dentry); |
1204 | dput(path->dentry); |
1205 | path->dentry = parent; |
1206 | exp = rqst_exp_get_by_name(rqstp, path); |
1207 | } |
1208 | dput(path->dentry); |
1209 | path->dentry = saved; |
1210 | return exp; |
1211 | } |
1212 | |
1213 | struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp) |
1214 | { |
1215 | u32 fsidv[2]; |
1216 | |
1217 | mk_fsid(vers: FSID_NUM, fsidv, dev: 0, ino: 0, fsid: 0, NULL); |
1218 | |
1219 | return rqst_exp_find(rqstp, fsid_type: FSID_NUM, fsidv); |
1220 | } |
1221 | |
1222 | /* |
1223 | * Called when we need the filehandle for the root of the pseudofs, |
1224 | * for a given NFSv4 client. The root is defined to be the |
1225 | * export point with fsid==0 |
1226 | */ |
1227 | __be32 |
1228 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1229 | { |
1230 | struct svc_export *exp; |
1231 | __be32 rv; |
1232 | |
1233 | exp = rqst_find_fsidzero_export(rqstp); |
1234 | if (IS_ERR(ptr: exp)) |
1235 | return nfserrno(errno: PTR_ERR(ptr: exp)); |
1236 | rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL); |
1237 | exp_put(exp); |
1238 | return rv; |
1239 | } |
1240 | |
1241 | static struct flags { |
1242 | int flag; |
1243 | char *name[2]; |
1244 | } expflags[] = { |
1245 | { NFSEXP_READONLY, {"ro" , "rw" }}, |
1246 | { NFSEXP_INSECURE_PORT, {"insecure" , "" }}, |
1247 | { NFSEXP_ROOTSQUASH, {"root_squash" , "no_root_squash" }}, |
1248 | { NFSEXP_ALLSQUASH, {"all_squash" , "" }}, |
1249 | { NFSEXP_ASYNC, {"async" , "sync" }}, |
1250 | { NFSEXP_GATHERED_WRITES, {"wdelay" , "no_wdelay" }}, |
1251 | { NFSEXP_NOREADDIRPLUS, {"nordirplus" , "" }}, |
1252 | { NFSEXP_NOHIDE, {"nohide" , "" }}, |
1253 | { NFSEXP_CROSSMOUNT, {"crossmnt" , "" }}, |
1254 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check" , "" }}, |
1255 | { NFSEXP_NOAUTHNLM, {"insecure_locks" , "" }}, |
1256 | { NFSEXP_V4ROOT, {"v4root" , "" }}, |
1257 | { NFSEXP_PNFS, {"pnfs" , "" }}, |
1258 | { NFSEXP_SECURITY_LABEL, {"security_label" , "" }}, |
1259 | { 0, {"" , "" }} |
1260 | }; |
1261 | |
1262 | static void show_expflags(struct seq_file *m, int flags, int mask) |
1263 | { |
1264 | struct flags *flg; |
1265 | int state, first = 0; |
1266 | |
1267 | for (flg = expflags; flg->flag; flg++) { |
1268 | if (flg->flag & ~mask) |
1269 | continue; |
1270 | state = (flg->flag & flags) ? 0 : 1; |
1271 | if (*flg->name[state]) |
1272 | seq_printf(m, fmt: "%s%s" , first++?"," :"" , flg->name[state]); |
1273 | } |
1274 | } |
1275 | |
1276 | static void show_secinfo_flags(struct seq_file *m, int flags) |
1277 | { |
1278 | seq_printf(m, fmt: "," ); |
1279 | show_expflags(m, flags, NFSEXP_SECINFO_FLAGS); |
1280 | } |
1281 | |
1282 | static bool secinfo_flags_equal(int f, int g) |
1283 | { |
1284 | f &= NFSEXP_SECINFO_FLAGS; |
1285 | g &= NFSEXP_SECINFO_FLAGS; |
1286 | return f == g; |
1287 | } |
1288 | |
1289 | static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end) |
1290 | { |
1291 | int flags; |
1292 | |
1293 | flags = (*fp)->flags; |
1294 | seq_printf(m, fmt: ",sec=%d" , (*fp)->pseudoflavor); |
1295 | (*fp)++; |
1296 | while (*fp != end && secinfo_flags_equal(f: flags, g: (*fp)->flags)) { |
1297 | seq_printf(m, fmt: ":%d" , (*fp)->pseudoflavor); |
1298 | (*fp)++; |
1299 | } |
1300 | return flags; |
1301 | } |
1302 | |
1303 | static void show_secinfo(struct seq_file *m, struct svc_export *exp) |
1304 | { |
1305 | struct exp_flavor_info *f; |
1306 | struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors; |
1307 | int flags; |
1308 | |
1309 | if (exp->ex_nflavors == 0) |
1310 | return; |
1311 | f = exp->ex_flavors; |
1312 | flags = show_secinfo_run(m, fp: &f, end); |
1313 | if (!secinfo_flags_equal(f: flags, g: exp->ex_flags)) |
1314 | show_secinfo_flags(m, flags); |
1315 | while (f != end) { |
1316 | flags = show_secinfo_run(m, fp: &f, end); |
1317 | show_secinfo_flags(m, flags); |
1318 | } |
1319 | } |
1320 | |
1321 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1322 | kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc) |
1323 | { |
1324 | struct user_namespace *userns = m->file->f_cred->user_ns; |
1325 | |
1326 | show_expflags(m, flags: flag, NFSEXP_ALLFLAGS); |
1327 | if (flag & NFSEXP_FSID) |
1328 | seq_printf(m, fmt: ",fsid=%d" , fsid); |
1329 | if (!uid_eq(left: anonu, right: make_kuid(from: userns, uid: (uid_t)-2)) && |
1330 | !uid_eq(left: anonu, right: make_kuid(from: userns, uid: 0x10000-2))) |
1331 | seq_printf(m, fmt: ",anonuid=%u" , from_kuid_munged(to: userns, uid: anonu)); |
1332 | if (!gid_eq(left: anong, right: make_kgid(from: userns, gid: (gid_t)-2)) && |
1333 | !gid_eq(left: anong, right: make_kgid(from: userns, gid: 0x10000-2))) |
1334 | seq_printf(m, fmt: ",anongid=%u" , from_kgid_munged(to: userns, gid: anong)); |
1335 | if (fsloc && fsloc->locations_count > 0) { |
1336 | char *loctype = (fsloc->migrated) ? "refer" : "replicas" ; |
1337 | int i; |
1338 | |
1339 | seq_printf(m, fmt: ",%s=" , loctype); |
1340 | seq_escape(m, s: fsloc->locations[0].path, esc: ",;@ \t\n\\" ); |
1341 | seq_putc(m, c: '@'); |
1342 | seq_escape(m, s: fsloc->locations[0].hosts, esc: ",;@ \t\n\\" ); |
1343 | for (i = 1; i < fsloc->locations_count; i++) { |
1344 | seq_putc(m, c: ';'); |
1345 | seq_escape(m, s: fsloc->locations[i].path, esc: ",;@ \t\n\\" ); |
1346 | seq_putc(m, c: '@'); |
1347 | seq_escape(m, s: fsloc->locations[i].hosts, esc: ",;@ \t\n\\" ); |
1348 | } |
1349 | } |
1350 | } |
1351 | |
1352 | static int e_show(struct seq_file *m, void *p) |
1353 | { |
1354 | struct cache_head *cp = p; |
1355 | struct svc_export *exp = container_of(cp, struct svc_export, h); |
1356 | struct cache_detail *cd = m->private; |
1357 | bool export_stats = is_export_stats_file(m); |
1358 | |
1359 | if (p == SEQ_START_TOKEN) { |
1360 | seq_puts(m, s: "# Version 1.1\n" ); |
1361 | if (export_stats) |
1362 | seq_puts(m, s: "# Path Client Start-time\n#\tStats\n" ); |
1363 | else |
1364 | seq_puts(m, s: "# Path Client(Flags) # IPs\n" ); |
1365 | return 0; |
1366 | } |
1367 | |
1368 | exp_get(exp); |
1369 | if (cache_check(detail: cd, h: &exp->h, NULL)) |
1370 | return 0; |
1371 | exp_put(exp); |
1372 | return svc_export_show(m, cd, h: cp); |
1373 | } |
1374 | |
1375 | const struct seq_operations nfs_exports_op = { |
1376 | .start = cache_seq_start_rcu, |
1377 | .next = cache_seq_next_rcu, |
1378 | .stop = cache_seq_stop_rcu, |
1379 | .show = e_show, |
1380 | }; |
1381 | |
1382 | /* |
1383 | * Initialize the exports module. |
1384 | */ |
1385 | int |
1386 | nfsd_export_init(struct net *net) |
1387 | { |
1388 | int rv; |
1389 | struct nfsd_net *nn = net_generic(net, id: nfsd_net_id); |
1390 | |
1391 | dprintk("nfsd: initializing export module (net: %x).\n" , net->ns.inum); |
1392 | |
1393 | nn->svc_export_cache = cache_create_net(tmpl: &svc_export_cache_template, net); |
1394 | if (IS_ERR(ptr: nn->svc_export_cache)) |
1395 | return PTR_ERR(ptr: nn->svc_export_cache); |
1396 | rv = cache_register_net(cd: nn->svc_export_cache, net); |
1397 | if (rv) |
1398 | goto destroy_export_cache; |
1399 | |
1400 | nn->svc_expkey_cache = cache_create_net(tmpl: &svc_expkey_cache_template, net); |
1401 | if (IS_ERR(ptr: nn->svc_expkey_cache)) { |
1402 | rv = PTR_ERR(ptr: nn->svc_expkey_cache); |
1403 | goto unregister_export_cache; |
1404 | } |
1405 | rv = cache_register_net(cd: nn->svc_expkey_cache, net); |
1406 | if (rv) |
1407 | goto destroy_expkey_cache; |
1408 | return 0; |
1409 | |
1410 | destroy_expkey_cache: |
1411 | cache_destroy_net(cd: nn->svc_expkey_cache, net); |
1412 | unregister_export_cache: |
1413 | cache_unregister_net(cd: nn->svc_export_cache, net); |
1414 | destroy_export_cache: |
1415 | cache_destroy_net(cd: nn->svc_export_cache, net); |
1416 | return rv; |
1417 | } |
1418 | |
1419 | /* |
1420 | * Flush exports table - called when last nfsd thread is killed |
1421 | */ |
1422 | void |
1423 | nfsd_export_flush(struct net *net) |
1424 | { |
1425 | struct nfsd_net *nn = net_generic(net, id: nfsd_net_id); |
1426 | |
1427 | cache_purge(detail: nn->svc_expkey_cache); |
1428 | cache_purge(detail: nn->svc_export_cache); |
1429 | } |
1430 | |
1431 | /* |
1432 | * Shutdown the exports module. |
1433 | */ |
1434 | void |
1435 | nfsd_export_shutdown(struct net *net) |
1436 | { |
1437 | struct nfsd_net *nn = net_generic(net, id: nfsd_net_id); |
1438 | |
1439 | dprintk("nfsd: shutting down export module (net: %x).\n" , net->ns.inum); |
1440 | |
1441 | cache_unregister_net(cd: nn->svc_expkey_cache, net); |
1442 | cache_unregister_net(cd: nn->svc_export_cache, net); |
1443 | cache_destroy_net(cd: nn->svc_expkey_cache, net); |
1444 | cache_destroy_net(cd: nn->svc_export_cache, net); |
1445 | svcauth_unix_purge(net); |
1446 | |
1447 | dprintk("nfsd: export shutdown complete (net: %x).\n" , net->ns.inum); |
1448 | } |
1449 | |