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Merge tag 'platform-drivers-x86-v4.19-1' of git://git.infradead.org/linux-platform...
[mirror_ubuntu-eoan-kernel.git] / fs / nfsd / export.c
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
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28 /*
29 * We have two caches.
30 * One maps client+vfsmnt+dentry to export options - the export map
31 * The other maps client+filehandle-fragment to export options. - the expkey map
32 *
33 * The export options are actually stored in the first map, and the
34 * second map contains a reference to the entry in the first map.
35 */
36
37 #define EXPKEY_HASHBITS 8
38 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
39 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
40
41 static void expkey_put(struct kref *ref)
42 {
43 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
44
45 if (test_bit(CACHE_VALID, &key->h.flags) &&
46 !test_bit(CACHE_NEGATIVE, &key->h.flags))
47 path_put(&key->ek_path);
48 auth_domain_put(key->ek_client);
49 kfree(key);
50 }
51
52 static void expkey_request(struct cache_detail *cd,
53 struct cache_head *h,
54 char **bpp, int *blen)
55 {
56 /* client fsidtype \xfsid */
57 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
58 char type[5];
59
60 qword_add(bpp, blen, ek->ek_client->name);
61 snprintf(type, 5, "%d", ek->ek_fsidtype);
62 qword_add(bpp, blen, type);
63 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
64 (*bpp)[-1] = '\n';
65 }
66
67 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
68 struct svc_expkey *old);
69 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
70
71 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
72 {
73 /* client fsidtype fsid expiry [path] */
74 char *buf;
75 int len;
76 struct auth_domain *dom = NULL;
77 int err;
78 int fsidtype;
79 char *ep;
80 struct svc_expkey key;
81 struct svc_expkey *ek = NULL;
82
83 if (mesg[mlen - 1] != '\n')
84 return -EINVAL;
85 mesg[mlen-1] = 0;
86
87 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
88 err = -ENOMEM;
89 if (!buf)
90 goto out;
91
92 err = -EINVAL;
93 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
94 goto out;
95
96 err = -ENOENT;
97 dom = auth_domain_find(buf);
98 if (!dom)
99 goto out;
100 dprintk("found domain %s\n", buf);
101
102 err = -EINVAL;
103 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
104 goto out;
105 fsidtype = simple_strtoul(buf, &ep, 10);
106 if (*ep)
107 goto out;
108 dprintk("found fsidtype %d\n", fsidtype);
109 if (key_len(fsidtype)==0) /* invalid type */
110 goto out;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 dprintk("found fsid length %d\n", len);
114 if (len != key_len(fsidtype))
115 goto out;
116
117 /* OK, we seem to have a valid key */
118 key.h.flags = 0;
119 key.h.expiry_time = get_expiry(&mesg);
120 if (key.h.expiry_time == 0)
121 goto out;
122
123 key.ek_client = dom;
124 key.ek_fsidtype = fsidtype;
125 memcpy(key.ek_fsid, buf, len);
126
127 ek = svc_expkey_lookup(cd, &key);
128 err = -ENOMEM;
129 if (!ek)
130 goto out;
131
132 /* now we want a pathname, or empty meaning NEGATIVE */
133 err = -EINVAL;
134 len = qword_get(&mesg, buf, PAGE_SIZE);
135 if (len < 0)
136 goto out;
137 dprintk("Path seems to be <%s>\n", buf);
138 err = 0;
139 if (len == 0) {
140 set_bit(CACHE_NEGATIVE, &key.h.flags);
141 ek = svc_expkey_update(cd, &key, ek);
142 if (!ek)
143 err = -ENOMEM;
144 } else {
145 err = kern_path(buf, 0, &key.ek_path);
146 if (err)
147 goto out;
148
149 dprintk("Found the path %s\n", buf);
150
151 ek = svc_expkey_update(cd, &key, ek);
152 if (!ek)
153 err = -ENOMEM;
154 path_put(&key.ek_path);
155 }
156 cache_flush();
157 out:
158 if (ek)
159 cache_put(&ek->h, cd);
160 if (dom)
161 auth_domain_put(dom);
162 kfree(buf);
163 return err;
164 }
165
166 static int expkey_show(struct seq_file *m,
167 struct cache_detail *cd,
168 struct cache_head *h)
169 {
170 struct svc_expkey *ek ;
171 int i;
172
173 if (h ==NULL) {
174 seq_puts(m, "#domain fsidtype fsid [path]\n");
175 return 0;
176 }
177 ek = container_of(h, struct svc_expkey, h);
178 seq_printf(m, "%s %d 0x", ek->ek_client->name,
179 ek->ek_fsidtype);
180 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
181 seq_printf(m, "%08x", ek->ek_fsid[i]);
182 if (test_bit(CACHE_VALID, &h->flags) &&
183 !test_bit(CACHE_NEGATIVE, &h->flags)) {
184 seq_printf(m, " ");
185 seq_path(m, &ek->ek_path, "\\ \t\n");
186 }
187 seq_printf(m, "\n");
188 return 0;
189 }
190
191 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
192 {
193 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
194 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
195
196 if (orig->ek_fsidtype != new->ek_fsidtype ||
197 orig->ek_client != new->ek_client ||
198 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
199 return 0;
200 return 1;
201 }
202
203 static inline void expkey_init(struct cache_head *cnew,
204 struct cache_head *citem)
205 {
206 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
207 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
208
209 kref_get(&item->ek_client->ref);
210 new->ek_client = item->ek_client;
211 new->ek_fsidtype = item->ek_fsidtype;
212
213 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
214 }
215
216 static inline void expkey_update(struct cache_head *cnew,
217 struct cache_head *citem)
218 {
219 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
220 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
221
222 new->ek_path = item->ek_path;
223 path_get(&item->ek_path);
224 }
225
226 static struct cache_head *expkey_alloc(void)
227 {
228 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
229 if (i)
230 return &i->h;
231 else
232 return NULL;
233 }
234
235 static const struct cache_detail svc_expkey_cache_template = {
236 .owner = THIS_MODULE,
237 .hash_size = EXPKEY_HASHMAX,
238 .name = "nfsd.fh",
239 .cache_put = expkey_put,
240 .cache_request = expkey_request,
241 .cache_parse = expkey_parse,
242 .cache_show = expkey_show,
243 .match = expkey_match,
244 .init = expkey_init,
245 .update = expkey_update,
246 .alloc = expkey_alloc,
247 };
248
249 static int
250 svc_expkey_hash(struct svc_expkey *item)
251 {
252 int hash = item->ek_fsidtype;
253 char * cp = (char*)item->ek_fsid;
254 int len = key_len(item->ek_fsidtype);
255
256 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
257 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
258 hash &= EXPKEY_HASHMASK;
259 return hash;
260 }
261
262 static struct svc_expkey *
263 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
264 {
265 struct cache_head *ch;
266 int hash = svc_expkey_hash(item);
267
268 ch = sunrpc_cache_lookup(cd, &item->h, hash);
269 if (ch)
270 return container_of(ch, struct svc_expkey, h);
271 else
272 return NULL;
273 }
274
275 static struct svc_expkey *
276 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
277 struct svc_expkey *old)
278 {
279 struct cache_head *ch;
280 int hash = svc_expkey_hash(new);
281
282 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
283 if (ch)
284 return container_of(ch, struct svc_expkey, h);
285 else
286 return NULL;
287 }
288
289
290 #define EXPORT_HASHBITS 8
291 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
292
293 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
294 {
295 struct nfsd4_fs_location *locations = fsloc->locations;
296 int i;
297
298 if (!locations)
299 return;
300
301 for (i = 0; i < fsloc->locations_count; i++) {
302 kfree(locations[i].path);
303 kfree(locations[i].hosts);
304 }
305
306 kfree(locations);
307 fsloc->locations = NULL;
308 }
309
310 static void svc_export_put(struct kref *ref)
311 {
312 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
313 path_put(&exp->ex_path);
314 auth_domain_put(exp->ex_client);
315 nfsd4_fslocs_free(&exp->ex_fslocs);
316 kfree(exp->ex_uuid);
317 kfree(exp);
318 }
319
320 static void svc_export_request(struct cache_detail *cd,
321 struct cache_head *h,
322 char **bpp, int *blen)
323 {
324 /* client path */
325 struct svc_export *exp = container_of(h, struct svc_export, h);
326 char *pth;
327
328 qword_add(bpp, blen, exp->ex_client->name);
329 pth = d_path(&exp->ex_path, *bpp, *blen);
330 if (IS_ERR(pth)) {
331 /* is this correct? */
332 (*bpp)[0] = '\n';
333 return;
334 }
335 qword_add(bpp, blen, pth);
336 (*bpp)[-1] = '\n';
337 }
338
339 static struct svc_export *svc_export_update(struct svc_export *new,
340 struct svc_export *old);
341 static struct svc_export *svc_export_lookup(struct svc_export *);
342
343 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
344 {
345
346 /*
347 * We currently export only dirs, regular files, and (for v4
348 * pseudoroot) symlinks.
349 */
350 if (!S_ISDIR(inode->i_mode) &&
351 !S_ISLNK(inode->i_mode) &&
352 !S_ISREG(inode->i_mode))
353 return -ENOTDIR;
354
355 /*
356 * Mountd should never pass down a writeable V4ROOT export, but,
357 * just to make sure:
358 */
359 if (*flags & NFSEXP_V4ROOT)
360 *flags |= NFSEXP_READONLY;
361
362 /* There are two requirements on a filesystem to be exportable.
363 * 1: We must be able to identify the filesystem from a number.
364 * either a device number (so FS_REQUIRES_DEV needed)
365 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
366 * 2: We must be able to find an inode from a filehandle.
367 * This means that s_export_op must be set.
368 */
369 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
370 !(*flags & NFSEXP_FSID) &&
371 uuid == NULL) {
372 dprintk("exp_export: export of non-dev fs without fsid\n");
373 return -EINVAL;
374 }
375
376 if (!inode->i_sb->s_export_op ||
377 !inode->i_sb->s_export_op->fh_to_dentry) {
378 dprintk("exp_export: export of invalid fs type.\n");
379 return -EINVAL;
380 }
381
382 return 0;
383
384 }
385
386 #ifdef CONFIG_NFSD_V4
387
388 static int
389 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
390 {
391 int len;
392 int migrated, i, err;
393
394 /* more than one fsloc */
395 if (fsloc->locations)
396 return -EINVAL;
397
398 /* listsize */
399 err = get_uint(mesg, &fsloc->locations_count);
400 if (err)
401 return err;
402 if (fsloc->locations_count > MAX_FS_LOCATIONS)
403 return -EINVAL;
404 if (fsloc->locations_count == 0)
405 return 0;
406
407 fsloc->locations = kcalloc(fsloc->locations_count,
408 sizeof(struct nfsd4_fs_location),
409 GFP_KERNEL);
410 if (!fsloc->locations)
411 return -ENOMEM;
412 for (i=0; i < fsloc->locations_count; i++) {
413 /* colon separated host list */
414 err = -EINVAL;
415 len = qword_get(mesg, buf, PAGE_SIZE);
416 if (len <= 0)
417 goto out_free_all;
418 err = -ENOMEM;
419 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
420 if (!fsloc->locations[i].hosts)
421 goto out_free_all;
422 err = -EINVAL;
423 /* slash separated path component list */
424 len = qword_get(mesg, buf, PAGE_SIZE);
425 if (len <= 0)
426 goto out_free_all;
427 err = -ENOMEM;
428 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
429 if (!fsloc->locations[i].path)
430 goto out_free_all;
431 }
432 /* migrated */
433 err = get_int(mesg, &migrated);
434 if (err)
435 goto out_free_all;
436 err = -EINVAL;
437 if (migrated < 0 || migrated > 1)
438 goto out_free_all;
439 fsloc->migrated = migrated;
440 return 0;
441 out_free_all:
442 nfsd4_fslocs_free(fsloc);
443 return err;
444 }
445
446 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
447 {
448 struct exp_flavor_info *f;
449 u32 listsize;
450 int err;
451
452 /* more than one secinfo */
453 if (exp->ex_nflavors)
454 return -EINVAL;
455
456 err = get_uint(mesg, &listsize);
457 if (err)
458 return err;
459 if (listsize > MAX_SECINFO_LIST)
460 return -EINVAL;
461
462 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
463 err = get_uint(mesg, &f->pseudoflavor);
464 if (err)
465 return err;
466 /*
467 * XXX: It would be nice to also check whether this
468 * pseudoflavor is supported, so we can discover the
469 * problem at export time instead of when a client fails
470 * to authenticate.
471 */
472 err = get_uint(mesg, &f->flags);
473 if (err)
474 return err;
475 /* Only some flags are allowed to differ between flavors: */
476 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
477 return -EINVAL;
478 }
479 exp->ex_nflavors = listsize;
480 return 0;
481 }
482
483 #else /* CONFIG_NFSD_V4 */
484 static inline int
485 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
486 static inline int
487 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
488 #endif
489
490 static inline int
491 nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
492 {
493 int len;
494
495 /* more than one uuid */
496 if (*puuid)
497 return -EINVAL;
498
499 /* expect a 16 byte uuid encoded as \xXXXX... */
500 len = qword_get(mesg, buf, PAGE_SIZE);
501 if (len != EX_UUID_LEN)
502 return -EINVAL;
503
504 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
505 if (*puuid == NULL)
506 return -ENOMEM;
507
508 return 0;
509 }
510
511 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
512 {
513 /* client path expiry [flags anonuid anongid fsid] */
514 char *buf;
515 int len;
516 int err;
517 struct auth_domain *dom = NULL;
518 struct svc_export exp = {}, *expp;
519 int an_int;
520
521 if (mesg[mlen-1] != '\n')
522 return -EINVAL;
523 mesg[mlen-1] = 0;
524
525 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
526 if (!buf)
527 return -ENOMEM;
528
529 /* client */
530 err = -EINVAL;
531 len = qword_get(&mesg, buf, PAGE_SIZE);
532 if (len <= 0)
533 goto out;
534
535 err = -ENOENT;
536 dom = auth_domain_find(buf);
537 if (!dom)
538 goto out;
539
540 /* path */
541 err = -EINVAL;
542 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
543 goto out1;
544
545 err = kern_path(buf, 0, &exp.ex_path);
546 if (err)
547 goto out1;
548
549 exp.ex_client = dom;
550 exp.cd = cd;
551 exp.ex_devid_map = NULL;
552
553 /* expiry */
554 err = -EINVAL;
555 exp.h.expiry_time = get_expiry(&mesg);
556 if (exp.h.expiry_time == 0)
557 goto out3;
558
559 /* flags */
560 err = get_int(&mesg, &an_int);
561 if (err == -ENOENT) {
562 err = 0;
563 set_bit(CACHE_NEGATIVE, &exp.h.flags);
564 } else {
565 if (err || an_int < 0)
566 goto out3;
567 exp.ex_flags= an_int;
568
569 /* anon uid */
570 err = get_int(&mesg, &an_int);
571 if (err)
572 goto out3;
573 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
574
575 /* anon gid */
576 err = get_int(&mesg, &an_int);
577 if (err)
578 goto out3;
579 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
580
581 /* fsid */
582 err = get_int(&mesg, &an_int);
583 if (err)
584 goto out3;
585 exp.ex_fsid = an_int;
586
587 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
588 if (strcmp(buf, "fsloc") == 0)
589 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
590 else if (strcmp(buf, "uuid") == 0)
591 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
592 else if (strcmp(buf, "secinfo") == 0)
593 err = secinfo_parse(&mesg, buf, &exp);
594 else
595 /* quietly ignore unknown words and anything
596 * following. Newer user-space can try to set
597 * new values, then see what the result was.
598 */
599 break;
600 if (err)
601 goto out4;
602 }
603
604 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
605 exp.ex_uuid);
606 if (err)
607 goto out4;
608 /*
609 * No point caching this if it would immediately expire.
610 * Also, this protects exportfs's dummy export from the
611 * anon_uid/anon_gid checks:
612 */
613 if (exp.h.expiry_time < seconds_since_boot())
614 goto out4;
615 /*
616 * For some reason exportfs has been passing down an
617 * invalid (-1) uid & gid on the "dummy" export which it
618 * uses to test export support. To make sure exportfs
619 * sees errors from check_export we therefore need to
620 * delay these checks till after check_export:
621 */
622 err = -EINVAL;
623 if (!uid_valid(exp.ex_anon_uid))
624 goto out4;
625 if (!gid_valid(exp.ex_anon_gid))
626 goto out4;
627 err = 0;
628
629 nfsd4_setup_layout_type(&exp);
630 }
631
632 expp = svc_export_lookup(&exp);
633 if (expp)
634 expp = svc_export_update(&exp, expp);
635 else
636 err = -ENOMEM;
637 cache_flush();
638 if (expp == NULL)
639 err = -ENOMEM;
640 else
641 exp_put(expp);
642 out4:
643 nfsd4_fslocs_free(&exp.ex_fslocs);
644 kfree(exp.ex_uuid);
645 out3:
646 path_put(&exp.ex_path);
647 out1:
648 auth_domain_put(dom);
649 out:
650 kfree(buf);
651 return err;
652 }
653
654 static void exp_flags(struct seq_file *m, int flag, int fsid,
655 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
656 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
657
658 static int svc_export_show(struct seq_file *m,
659 struct cache_detail *cd,
660 struct cache_head *h)
661 {
662 struct svc_export *exp ;
663
664 if (h ==NULL) {
665 seq_puts(m, "#path domain(flags)\n");
666 return 0;
667 }
668 exp = container_of(h, struct svc_export, h);
669 seq_path(m, &exp->ex_path, " \t\n\\");
670 seq_putc(m, '\t');
671 seq_escape(m, exp->ex_client->name, " \t\n\\");
672 seq_putc(m, '(');
673 if (test_bit(CACHE_VALID, &h->flags) &&
674 !test_bit(CACHE_NEGATIVE, &h->flags)) {
675 exp_flags(m, exp->ex_flags, exp->ex_fsid,
676 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
677 if (exp->ex_uuid) {
678 int i;
679 seq_puts(m, ",uuid=");
680 for (i = 0; i < EX_UUID_LEN; i++) {
681 if ((i&3) == 0 && i)
682 seq_putc(m, ':');
683 seq_printf(m, "%02x", exp->ex_uuid[i]);
684 }
685 }
686 show_secinfo(m, exp);
687 }
688 seq_puts(m, ")\n");
689 return 0;
690 }
691 static int svc_export_match(struct cache_head *a, struct cache_head *b)
692 {
693 struct svc_export *orig = container_of(a, struct svc_export, h);
694 struct svc_export *new = container_of(b, struct svc_export, h);
695 return orig->ex_client == new->ex_client &&
696 path_equal(&orig->ex_path, &new->ex_path);
697 }
698
699 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
700 {
701 struct svc_export *new = container_of(cnew, struct svc_export, h);
702 struct svc_export *item = container_of(citem, struct svc_export, h);
703
704 kref_get(&item->ex_client->ref);
705 new->ex_client = item->ex_client;
706 new->ex_path = item->ex_path;
707 path_get(&item->ex_path);
708 new->ex_fslocs.locations = NULL;
709 new->ex_fslocs.locations_count = 0;
710 new->ex_fslocs.migrated = 0;
711 new->ex_layout_types = 0;
712 new->ex_uuid = NULL;
713 new->cd = item->cd;
714 }
715
716 static void export_update(struct cache_head *cnew, struct cache_head *citem)
717 {
718 struct svc_export *new = container_of(cnew, struct svc_export, h);
719 struct svc_export *item = container_of(citem, struct svc_export, h);
720 int i;
721
722 new->ex_flags = item->ex_flags;
723 new->ex_anon_uid = item->ex_anon_uid;
724 new->ex_anon_gid = item->ex_anon_gid;
725 new->ex_fsid = item->ex_fsid;
726 new->ex_devid_map = item->ex_devid_map;
727 item->ex_devid_map = NULL;
728 new->ex_uuid = item->ex_uuid;
729 item->ex_uuid = NULL;
730 new->ex_fslocs.locations = item->ex_fslocs.locations;
731 item->ex_fslocs.locations = NULL;
732 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
733 item->ex_fslocs.locations_count = 0;
734 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
735 item->ex_fslocs.migrated = 0;
736 new->ex_layout_types = item->ex_layout_types;
737 new->ex_nflavors = item->ex_nflavors;
738 for (i = 0; i < MAX_SECINFO_LIST; i++) {
739 new->ex_flavors[i] = item->ex_flavors[i];
740 }
741 }
742
743 static struct cache_head *svc_export_alloc(void)
744 {
745 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
746 if (i)
747 return &i->h;
748 else
749 return NULL;
750 }
751
752 static const struct cache_detail svc_export_cache_template = {
753 .owner = THIS_MODULE,
754 .hash_size = EXPORT_HASHMAX,
755 .name = "nfsd.export",
756 .cache_put = svc_export_put,
757 .cache_request = svc_export_request,
758 .cache_parse = svc_export_parse,
759 .cache_show = svc_export_show,
760 .match = svc_export_match,
761 .init = svc_export_init,
762 .update = export_update,
763 .alloc = svc_export_alloc,
764 };
765
766 static int
767 svc_export_hash(struct svc_export *exp)
768 {
769 int hash;
770
771 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
772 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
773 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
774 return hash;
775 }
776
777 static struct svc_export *
778 svc_export_lookup(struct svc_export *exp)
779 {
780 struct cache_head *ch;
781 int hash = svc_export_hash(exp);
782
783 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
784 if (ch)
785 return container_of(ch, struct svc_export, h);
786 else
787 return NULL;
788 }
789
790 static struct svc_export *
791 svc_export_update(struct svc_export *new, struct svc_export *old)
792 {
793 struct cache_head *ch;
794 int hash = svc_export_hash(old);
795
796 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
797 if (ch)
798 return container_of(ch, struct svc_export, h);
799 else
800 return NULL;
801 }
802
803
804 static struct svc_expkey *
805 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
806 u32 *fsidv, struct cache_req *reqp)
807 {
808 struct svc_expkey key, *ek;
809 int err;
810
811 if (!clp)
812 return ERR_PTR(-ENOENT);
813
814 key.ek_client = clp;
815 key.ek_fsidtype = fsid_type;
816 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
817
818 ek = svc_expkey_lookup(cd, &key);
819 if (ek == NULL)
820 return ERR_PTR(-ENOMEM);
821 err = cache_check(cd, &ek->h, reqp);
822 if (err)
823 return ERR_PTR(err);
824 return ek;
825 }
826
827 static struct svc_export *
828 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
829 const struct path *path, struct cache_req *reqp)
830 {
831 struct svc_export *exp, key;
832 int err;
833
834 if (!clp)
835 return ERR_PTR(-ENOENT);
836
837 key.ex_client = clp;
838 key.ex_path = *path;
839 key.cd = cd;
840
841 exp = svc_export_lookup(&key);
842 if (exp == NULL)
843 return ERR_PTR(-ENOMEM);
844 err = cache_check(cd, &exp->h, reqp);
845 if (err)
846 return ERR_PTR(err);
847 return exp;
848 }
849
850 /*
851 * Find the export entry for a given dentry.
852 */
853 static struct svc_export *
854 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
855 {
856 struct dentry *saved = dget(path->dentry);
857 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
858
859 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
860 struct dentry *parent = dget_parent(path->dentry);
861 dput(path->dentry);
862 path->dentry = parent;
863 exp = exp_get_by_name(cd, clp, path, NULL);
864 }
865 dput(path->dentry);
866 path->dentry = saved;
867 return exp;
868 }
869
870
871
872 /*
873 * Obtain the root fh on behalf of a client.
874 * This could be done in user space, but I feel that it adds some safety
875 * since its harder to fool a kernel module than a user space program.
876 */
877 int
878 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
879 struct knfsd_fh *f, int maxsize)
880 {
881 struct svc_export *exp;
882 struct path path;
883 struct inode *inode;
884 struct svc_fh fh;
885 int err;
886 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
887 struct cache_detail *cd = nn->svc_export_cache;
888
889 err = -EPERM;
890 /* NB: we probably ought to check that it's NUL-terminated */
891 if (kern_path(name, 0, &path)) {
892 printk("nfsd: exp_rootfh path not found %s", name);
893 return err;
894 }
895 inode = d_inode(path.dentry);
896
897 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
898 name, path.dentry, clp->name,
899 inode->i_sb->s_id, inode->i_ino);
900 exp = exp_parent(cd, clp, &path);
901 if (IS_ERR(exp)) {
902 err = PTR_ERR(exp);
903 goto out;
904 }
905
906 /*
907 * fh must be initialized before calling fh_compose
908 */
909 fh_init(&fh, maxsize);
910 if (fh_compose(&fh, exp, path.dentry, NULL))
911 err = -EINVAL;
912 else
913 err = 0;
914 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
915 fh_put(&fh);
916 exp_put(exp);
917 out:
918 path_put(&path);
919 return err;
920 }
921
922 static struct svc_export *exp_find(struct cache_detail *cd,
923 struct auth_domain *clp, int fsid_type,
924 u32 *fsidv, struct cache_req *reqp)
925 {
926 struct svc_export *exp;
927 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
928 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
929 if (IS_ERR(ek))
930 return ERR_CAST(ek);
931
932 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
933 cache_put(&ek->h, nn->svc_expkey_cache);
934
935 if (IS_ERR(exp))
936 return ERR_CAST(exp);
937 return exp;
938 }
939
940 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
941 {
942 struct exp_flavor_info *f;
943 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
944
945 /* legacy gss-only clients are always OK: */
946 if (exp->ex_client == rqstp->rq_gssclient)
947 return 0;
948 /* ip-address based client; check sec= export option: */
949 for (f = exp->ex_flavors; f < end; f++) {
950 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
951 return 0;
952 }
953 /* defaults in absence of sec= options: */
954 if (exp->ex_nflavors == 0) {
955 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
956 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
957 return 0;
958 }
959
960 /* If the compound op contains a spo_must_allowed op,
961 * it will be sent with integrity/protection which
962 * will have to be expressly allowed on mounts that
963 * don't support it
964 */
965
966 if (nfsd4_spo_must_allow(rqstp))
967 return 0;
968
969 return nfserr_wrongsec;
970 }
971
972 /*
973 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
974 * auth_unix client) if it's available and has secinfo information;
975 * otherwise, will try to use rq_gssclient.
976 *
977 * Called from functions that handle requests; functions that do work on
978 * behalf of mountd are passed a single client name to use, and should
979 * use exp_get_by_name() or exp_find().
980 */
981 struct svc_export *
982 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
983 {
984 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
985 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
986 struct cache_detail *cd = nn->svc_export_cache;
987
988 if (rqstp->rq_client == NULL)
989 goto gss;
990
991 /* First try the auth_unix client: */
992 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
993 if (PTR_ERR(exp) == -ENOENT)
994 goto gss;
995 if (IS_ERR(exp))
996 return exp;
997 /* If it has secinfo, assume there are no gss/... clients */
998 if (exp->ex_nflavors > 0)
999 return exp;
1000 gss:
1001 /* Otherwise, try falling back on gss client */
1002 if (rqstp->rq_gssclient == NULL)
1003 return exp;
1004 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1005 if (PTR_ERR(gssexp) == -ENOENT)
1006 return exp;
1007 if (!IS_ERR(exp))
1008 exp_put(exp);
1009 return gssexp;
1010 }
1011
1012 struct svc_export *
1013 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1014 {
1015 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1016 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1017 struct cache_detail *cd = nn->svc_export_cache;
1018
1019 if (rqstp->rq_client == NULL)
1020 goto gss;
1021
1022 /* First try the auth_unix client: */
1023 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1024 fsidv, &rqstp->rq_chandle);
1025 if (PTR_ERR(exp) == -ENOENT)
1026 goto gss;
1027 if (IS_ERR(exp))
1028 return exp;
1029 /* If it has secinfo, assume there are no gss/... clients */
1030 if (exp->ex_nflavors > 0)
1031 return exp;
1032 gss:
1033 /* Otherwise, try falling back on gss client */
1034 if (rqstp->rq_gssclient == NULL)
1035 return exp;
1036 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1037 &rqstp->rq_chandle);
1038 if (PTR_ERR(gssexp) == -ENOENT)
1039 return exp;
1040 if (!IS_ERR(exp))
1041 exp_put(exp);
1042 return gssexp;
1043 }
1044
1045 struct svc_export *
1046 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1047 {
1048 struct dentry *saved = dget(path->dentry);
1049 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1050
1051 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1052 struct dentry *parent = dget_parent(path->dentry);
1053 dput(path->dentry);
1054 path->dentry = parent;
1055 exp = rqst_exp_get_by_name(rqstp, path);
1056 }
1057 dput(path->dentry);
1058 path->dentry = saved;
1059 return exp;
1060 }
1061
1062 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1063 {
1064 u32 fsidv[2];
1065
1066 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1067
1068 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1069 }
1070
1071 /*
1072 * Called when we need the filehandle for the root of the pseudofs,
1073 * for a given NFSv4 client. The root is defined to be the
1074 * export point with fsid==0
1075 */
1076 __be32
1077 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1078 {
1079 struct svc_export *exp;
1080 __be32 rv;
1081
1082 exp = rqst_find_fsidzero_export(rqstp);
1083 if (IS_ERR(exp))
1084 return nfserrno(PTR_ERR(exp));
1085 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1086 exp_put(exp);
1087 return rv;
1088 }
1089
1090 static struct flags {
1091 int flag;
1092 char *name[2];
1093 } expflags[] = {
1094 { NFSEXP_READONLY, {"ro", "rw"}},
1095 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1096 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1097 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1098 { NFSEXP_ASYNC, {"async", "sync"}},
1099 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1100 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1101 { NFSEXP_NOHIDE, {"nohide", ""}},
1102 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1103 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1104 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1105 { NFSEXP_V4ROOT, {"v4root", ""}},
1106 { NFSEXP_PNFS, {"pnfs", ""}},
1107 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1108 { 0, {"", ""}}
1109 };
1110
1111 static void show_expflags(struct seq_file *m, int flags, int mask)
1112 {
1113 struct flags *flg;
1114 int state, first = 0;
1115
1116 for (flg = expflags; flg->flag; flg++) {
1117 if (flg->flag & ~mask)
1118 continue;
1119 state = (flg->flag & flags) ? 0 : 1;
1120 if (*flg->name[state])
1121 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1122 }
1123 }
1124
1125 static void show_secinfo_flags(struct seq_file *m, int flags)
1126 {
1127 seq_printf(m, ",");
1128 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1129 }
1130
1131 static bool secinfo_flags_equal(int f, int g)
1132 {
1133 f &= NFSEXP_SECINFO_FLAGS;
1134 g &= NFSEXP_SECINFO_FLAGS;
1135 return f == g;
1136 }
1137
1138 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1139 {
1140 int flags;
1141
1142 flags = (*fp)->flags;
1143 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1144 (*fp)++;
1145 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1146 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1147 (*fp)++;
1148 }
1149 return flags;
1150 }
1151
1152 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1153 {
1154 struct exp_flavor_info *f;
1155 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1156 int flags;
1157
1158 if (exp->ex_nflavors == 0)
1159 return;
1160 f = exp->ex_flavors;
1161 flags = show_secinfo_run(m, &f, end);
1162 if (!secinfo_flags_equal(flags, exp->ex_flags))
1163 show_secinfo_flags(m, flags);
1164 while (f != end) {
1165 flags = show_secinfo_run(m, &f, end);
1166 show_secinfo_flags(m, flags);
1167 }
1168 }
1169
1170 static void exp_flags(struct seq_file *m, int flag, int fsid,
1171 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1172 {
1173 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1174 if (flag & NFSEXP_FSID)
1175 seq_printf(m, ",fsid=%d", fsid);
1176 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1177 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1178 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1179 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1180 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1181 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1182 if (fsloc && fsloc->locations_count > 0) {
1183 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1184 int i;
1185
1186 seq_printf(m, ",%s=", loctype);
1187 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1188 seq_putc(m, '@');
1189 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1190 for (i = 1; i < fsloc->locations_count; i++) {
1191 seq_putc(m, ';');
1192 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1193 seq_putc(m, '@');
1194 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1195 }
1196 }
1197 }
1198
1199 static int e_show(struct seq_file *m, void *p)
1200 {
1201 struct cache_head *cp = p;
1202 struct svc_export *exp = container_of(cp, struct svc_export, h);
1203 struct cache_detail *cd = m->private;
1204
1205 if (p == SEQ_START_TOKEN) {
1206 seq_puts(m, "# Version 1.1\n");
1207 seq_puts(m, "# Path Client(Flags) # IPs\n");
1208 return 0;
1209 }
1210
1211 exp_get(exp);
1212 if (cache_check(cd, &exp->h, NULL))
1213 return 0;
1214 exp_put(exp);
1215 return svc_export_show(m, cd, cp);
1216 }
1217
1218 const struct seq_operations nfs_exports_op = {
1219 .start = cache_seq_start,
1220 .next = cache_seq_next,
1221 .stop = cache_seq_stop,
1222 .show = e_show,
1223 };
1224
1225 /*
1226 * Initialize the exports module.
1227 */
1228 int
1229 nfsd_export_init(struct net *net)
1230 {
1231 int rv;
1232 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1233
1234 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1235
1236 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1237 if (IS_ERR(nn->svc_export_cache))
1238 return PTR_ERR(nn->svc_export_cache);
1239 rv = cache_register_net(nn->svc_export_cache, net);
1240 if (rv)
1241 goto destroy_export_cache;
1242
1243 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1244 if (IS_ERR(nn->svc_expkey_cache)) {
1245 rv = PTR_ERR(nn->svc_expkey_cache);
1246 goto unregister_export_cache;
1247 }
1248 rv = cache_register_net(nn->svc_expkey_cache, net);
1249 if (rv)
1250 goto destroy_expkey_cache;
1251 return 0;
1252
1253 destroy_expkey_cache:
1254 cache_destroy_net(nn->svc_expkey_cache, net);
1255 unregister_export_cache:
1256 cache_unregister_net(nn->svc_export_cache, net);
1257 destroy_export_cache:
1258 cache_destroy_net(nn->svc_export_cache, net);
1259 return rv;
1260 }
1261
1262 /*
1263 * Flush exports table - called when last nfsd thread is killed
1264 */
1265 void
1266 nfsd_export_flush(struct net *net)
1267 {
1268 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1269
1270 cache_purge(nn->svc_expkey_cache);
1271 cache_purge(nn->svc_export_cache);
1272 }
1273
1274 /*
1275 * Shutdown the exports module.
1276 */
1277 void
1278 nfsd_export_shutdown(struct net *net)
1279 {
1280 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1281
1282 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1283
1284 cache_unregister_net(nn->svc_expkey_cache, net);
1285 cache_unregister_net(nn->svc_export_cache, net);
1286 cache_destroy_net(nn->svc_expkey_cache, net);
1287 cache_destroy_net(nn->svc_export_cache, net);
1288 svcauth_unix_purge(net);
1289
1290 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1291 }
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