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