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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
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
41static 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
52static 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
67static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
68 struct svc_expkey *old);
69static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
70
71static 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
166static 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
191static 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
203static 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
216static 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
226static 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
235static 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
249static int
250svc_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
262static struct svc_expkey *
263svc_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
275static struct svc_expkey *
276svc_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
293static 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
310static 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
320static 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
339static struct svc_export *svc_export_update(struct svc_export *new,
340 struct svc_export *old);
341static struct svc_export *svc_export_lookup(struct svc_export *);
342
343static 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
388static int
389fsloc_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 = kzalloc(fsloc->locations_count
408 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
409 if (!fsloc->locations)
410 return -ENOMEM;
411 for (i=0; i < fsloc->locations_count; i++) {
412 /* colon separated host list */
413 err = -EINVAL;
414 len = qword_get(mesg, buf, PAGE_SIZE);
415 if (len <= 0)
416 goto out_free_all;
417 err = -ENOMEM;
418 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
419 if (!fsloc->locations[i].hosts)
420 goto out_free_all;
421 err = -EINVAL;
422 /* slash separated path component list */
423 len = qword_get(mesg, buf, PAGE_SIZE);
424 if (len <= 0)
425 goto out_free_all;
426 err = -ENOMEM;
427 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
428 if (!fsloc->locations[i].path)
429 goto out_free_all;
430 }
431 /* migrated */
432 err = get_int(mesg, &migrated);
433 if (err)
434 goto out_free_all;
435 err = -EINVAL;
436 if (migrated < 0 || migrated > 1)
437 goto out_free_all;
438 fsloc->migrated = migrated;
439 return 0;
440out_free_all:
441 nfsd4_fslocs_free(fsloc);
442 return err;
443}
444
445static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
446{
447 struct exp_flavor_info *f;
448 u32 listsize;
449 int err;
450
451 /* more than one secinfo */
452 if (exp->ex_nflavors)
453 return -EINVAL;
454
455 err = get_uint(mesg, &listsize);
456 if (err)
457 return err;
458 if (listsize > MAX_SECINFO_LIST)
459 return -EINVAL;
460
461 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
462 err = get_uint(mesg, &f->pseudoflavor);
463 if (err)
464 return err;
465 /*
466 * XXX: It would be nice to also check whether this
467 * pseudoflavor is supported, so we can discover the
468 * problem at export time instead of when a client fails
469 * to authenticate.
470 */
471 err = get_uint(mesg, &f->flags);
472 if (err)
473 return err;
474 /* Only some flags are allowed to differ between flavors: */
475 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
476 return -EINVAL;
477 }
478 exp->ex_nflavors = listsize;
479 return 0;
480}
481
482#else /* CONFIG_NFSD_V4 */
483static inline int
484fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
485static inline int
486secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
487#endif
488
489static inline int
490nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
491{
492 int len;
493
494 /* more than one uuid */
495 if (*puuid)
496 return -EINVAL;
497
498 /* expect a 16 byte uuid encoded as \xXXXX... */
499 len = qword_get(mesg, buf, PAGE_SIZE);
500 if (len != EX_UUID_LEN)
501 return -EINVAL;
502
503 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
504 if (*puuid == NULL)
505 return -ENOMEM;
506
507 return 0;
508}
509
510static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
511{
512 /* client path expiry [flags anonuid anongid fsid] */
513 char *buf;
514 int len;
515 int err;
516 struct auth_domain *dom = NULL;
517 struct svc_export exp = {}, *expp;
518 int an_int;
519
520 if (mesg[mlen-1] != '\n')
521 return -EINVAL;
522 mesg[mlen-1] = 0;
523
524 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
525 if (!buf)
526 return -ENOMEM;
527
528 /* client */
529 err = -EINVAL;
530 len = qword_get(&mesg, buf, PAGE_SIZE);
531 if (len <= 0)
532 goto out;
533
534 err = -ENOENT;
535 dom = auth_domain_find(buf);
536 if (!dom)
537 goto out;
538
539 /* path */
540 err = -EINVAL;
541 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
542 goto out1;
543
544 err = kern_path(buf, 0, &exp.ex_path);
545 if (err)
546 goto out1;
547
548 exp.ex_client = dom;
549 exp.cd = cd;
550 exp.ex_devid_map = NULL;
551
552 /* expiry */
553 err = -EINVAL;
554 exp.h.expiry_time = get_expiry(&mesg);
555 if (exp.h.expiry_time == 0)
556 goto out3;
557
558 /* flags */
559 err = get_int(&mesg, &an_int);
560 if (err == -ENOENT) {
561 err = 0;
562 set_bit(CACHE_NEGATIVE, &exp.h.flags);
563 } else {
564 if (err || an_int < 0)
565 goto out3;
566 exp.ex_flags= an_int;
567
568 /* anon uid */
569 err = get_int(&mesg, &an_int);
570 if (err)
571 goto out3;
572 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
573
574 /* anon gid */
575 err = get_int(&mesg, &an_int);
576 if (err)
577 goto out3;
578 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
579
580 /* fsid */
581 err = get_int(&mesg, &an_int);
582 if (err)
583 goto out3;
584 exp.ex_fsid = an_int;
585
586 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
587 if (strcmp(buf, "fsloc") == 0)
588 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
589 else if (strcmp(buf, "uuid") == 0)
590 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
591 else if (strcmp(buf, "secinfo") == 0)
592 err = secinfo_parse(&mesg, buf, &exp);
593 else
594 /* quietly ignore unknown words and anything
595 * following. Newer user-space can try to set
596 * new values, then see what the result was.
597 */
598 break;
599 if (err)
600 goto out4;
601 }
602
603 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
604 exp.ex_uuid);
605 if (err)
606 goto out4;
607 /*
608 * No point caching this if it would immediately expire.
609 * Also, this protects exportfs's dummy export from the
610 * anon_uid/anon_gid checks:
611 */
612 if (exp.h.expiry_time < seconds_since_boot())
613 goto out4;
614 /*
615 * For some reason exportfs has been passing down an
616 * invalid (-1) uid & gid on the "dummy" export which it
617 * uses to test export support. To make sure exportfs
618 * sees errors from check_export we therefore need to
619 * delay these checks till after check_export:
620 */
621 err = -EINVAL;
622 if (!uid_valid(exp.ex_anon_uid))
623 goto out4;
624 if (!gid_valid(exp.ex_anon_gid))
625 goto out4;
626 err = 0;
627
628 nfsd4_setup_layout_type(&exp);
629 }
630
631 expp = svc_export_lookup(&exp);
632 if (expp)
633 expp = svc_export_update(&exp, expp);
634 else
635 err = -ENOMEM;
636 cache_flush();
637 if (expp == NULL)
638 err = -ENOMEM;
639 else
640 exp_put(expp);
641out4:
642 nfsd4_fslocs_free(&exp.ex_fslocs);
643 kfree(exp.ex_uuid);
644out3:
645 path_put(&exp.ex_path);
646out1:
647 auth_domain_put(dom);
648out:
649 kfree(buf);
650 return err;
651}
652
653static void exp_flags(struct seq_file *m, int flag, int fsid,
654 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
655static void show_secinfo(struct seq_file *m, struct svc_export *exp);
656
657static int svc_export_show(struct seq_file *m,
658 struct cache_detail *cd,
659 struct cache_head *h)
660{
661 struct svc_export *exp ;
662
663 if (h ==NULL) {
664 seq_puts(m, "#path domain(flags)\n");
665 return 0;
666 }
667 exp = container_of(h, struct svc_export, h);
668 seq_path(m, &exp->ex_path, " \t\n\\");
669 seq_putc(m, '\t');
670 seq_escape(m, exp->ex_client->name, " \t\n\\");
671 seq_putc(m, '(');
672 if (test_bit(CACHE_VALID, &h->flags) &&
673 !test_bit(CACHE_NEGATIVE, &h->flags)) {
674 exp_flags(m, exp->ex_flags, exp->ex_fsid,
675 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
676 if (exp->ex_uuid) {
677 int i;
678 seq_puts(m, ",uuid=");
679 for (i = 0; i < EX_UUID_LEN; i++) {
680 if ((i&3) == 0 && i)
681 seq_putc(m, ':');
682 seq_printf(m, "%02x", exp->ex_uuid[i]);
683 }
684 }
685 show_secinfo(m, exp);
686 }
687 seq_puts(m, ")\n");
688 return 0;
689}
690static int svc_export_match(struct cache_head *a, struct cache_head *b)
691{
692 struct svc_export *orig = container_of(a, struct svc_export, h);
693 struct svc_export *new = container_of(b, struct svc_export, h);
694 return orig->ex_client == new->ex_client &&
695 path_equal(&orig->ex_path, &new->ex_path);
696}
697
698static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
699{
700 struct svc_export *new = container_of(cnew, struct svc_export, h);
701 struct svc_export *item = container_of(citem, struct svc_export, h);
702
703 kref_get(&item->ex_client->ref);
704 new->ex_client = item->ex_client;
705 new->ex_path = item->ex_path;
706 path_get(&item->ex_path);
707 new->ex_fslocs.locations = NULL;
708 new->ex_fslocs.locations_count = 0;
709 new->ex_fslocs.migrated = 0;
710 new->ex_layout_types = 0;
711 new->ex_uuid = NULL;
712 new->cd = item->cd;
713}
714
715static void export_update(struct cache_head *cnew, struct cache_head *citem)
716{
717 struct svc_export *new = container_of(cnew, struct svc_export, h);
718 struct svc_export *item = container_of(citem, struct svc_export, h);
719 int i;
720
721 new->ex_flags = item->ex_flags;
722 new->ex_anon_uid = item->ex_anon_uid;
723 new->ex_anon_gid = item->ex_anon_gid;
724 new->ex_fsid = item->ex_fsid;
725 new->ex_devid_map = item->ex_devid_map;
726 item->ex_devid_map = NULL;
727 new->ex_uuid = item->ex_uuid;
728 item->ex_uuid = NULL;
729 new->ex_fslocs.locations = item->ex_fslocs.locations;
730 item->ex_fslocs.locations = NULL;
731 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
732 item->ex_fslocs.locations_count = 0;
733 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
734 item->ex_fslocs.migrated = 0;
735 new->ex_layout_types = item->ex_layout_types;
736 new->ex_nflavors = item->ex_nflavors;
737 for (i = 0; i < MAX_SECINFO_LIST; i++) {
738 new->ex_flavors[i] = item->ex_flavors[i];
739 }
740}
741
742static struct cache_head *svc_export_alloc(void)
743{
744 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
745 if (i)
746 return &i->h;
747 else
748 return NULL;
749}
750
751static const struct cache_detail svc_export_cache_template = {
752 .owner = THIS_MODULE,
753 .hash_size = EXPORT_HASHMAX,
754 .name = "nfsd.export",
755 .cache_put = svc_export_put,
756 .cache_request = svc_export_request,
757 .cache_parse = svc_export_parse,
758 .cache_show = svc_export_show,
759 .match = svc_export_match,
760 .init = svc_export_init,
761 .update = export_update,
762 .alloc = svc_export_alloc,
763};
764
765static int
766svc_export_hash(struct svc_export *exp)
767{
768 int hash;
769
770 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
771 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
772 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
773 return hash;
774}
775
776static struct svc_export *
777svc_export_lookup(struct svc_export *exp)
778{
779 struct cache_head *ch;
780 int hash = svc_export_hash(exp);
781
782 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
783 if (ch)
784 return container_of(ch, struct svc_export, h);
785 else
786 return NULL;
787}
788
789static struct svc_export *
790svc_export_update(struct svc_export *new, struct svc_export *old)
791{
792 struct cache_head *ch;
793 int hash = svc_export_hash(old);
794
795 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
796 if (ch)
797 return container_of(ch, struct svc_export, h);
798 else
799 return NULL;
800}
801
802
803static struct svc_expkey *
804exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
805 u32 *fsidv, struct cache_req *reqp)
806{
807 struct svc_expkey key, *ek;
808 int err;
809
810 if (!clp)
811 return ERR_PTR(-ENOENT);
812
813 key.ek_client = clp;
814 key.ek_fsidtype = fsid_type;
815 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
816
817 ek = svc_expkey_lookup(cd, &key);
818 if (ek == NULL)
819 return ERR_PTR(-ENOMEM);
820 err = cache_check(cd, &ek->h, reqp);
821 if (err)
822 return ERR_PTR(err);
823 return ek;
824}
825
826static struct svc_export *
827exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
828 const struct path *path, struct cache_req *reqp)
829{
830 struct svc_export *exp, key;
831 int err;
832
833 if (!clp)
834 return ERR_PTR(-ENOENT);
835
836 key.ex_client = clp;
837 key.ex_path = *path;
838 key.cd = cd;
839
840 exp = svc_export_lookup(&key);
841 if (exp == NULL)
842 return ERR_PTR(-ENOMEM);
843 err = cache_check(cd, &exp->h, reqp);
844 if (err)
845 return ERR_PTR(err);
846 return exp;
847}
848
849/*
850 * Find the export entry for a given dentry.
851 */
852static struct svc_export *
853exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
854{
855 struct dentry *saved = dget(path->dentry);
856 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
857
858 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
859 struct dentry *parent = dget_parent(path->dentry);
860 dput(path->dentry);
861 path->dentry = parent;
862 exp = exp_get_by_name(cd, clp, path, NULL);
863 }
864 dput(path->dentry);
865 path->dentry = saved;
866 return exp;
867}
868
869
870
871/*
872 * Obtain the root fh on behalf of a client.
873 * This could be done in user space, but I feel that it adds some safety
874 * since its harder to fool a kernel module than a user space program.
875 */
876int
877exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
878 struct knfsd_fh *f, int maxsize)
879{
880 struct svc_export *exp;
881 struct path path;
882 struct inode *inode;
883 struct svc_fh fh;
884 int err;
885 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
886 struct cache_detail *cd = nn->svc_export_cache;
887
888 err = -EPERM;
889 /* NB: we probably ought to check that it's NUL-terminated */
890 if (kern_path(name, 0, &path)) {
891 printk("nfsd: exp_rootfh path not found %s", name);
892 return err;
893 }
894 inode = d_inode(path.dentry);
895
896 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
897 name, path.dentry, clp->name,
898 inode->i_sb->s_id, inode->i_ino);
899 exp = exp_parent(cd, clp, &path);
900 if (IS_ERR(exp)) {
901 err = PTR_ERR(exp);
902 goto out;
903 }
904
905 /*
906 * fh must be initialized before calling fh_compose
907 */
908 fh_init(&fh, maxsize);
909 if (fh_compose(&fh, exp, path.dentry, NULL))
910 err = -EINVAL;
911 else
912 err = 0;
913 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
914 fh_put(&fh);
915 exp_put(exp);
916out:
917 path_put(&path);
918 return err;
919}
920
921static struct svc_export *exp_find(struct cache_detail *cd,
922 struct auth_domain *clp, int fsid_type,
923 u32 *fsidv, struct cache_req *reqp)
924{
925 struct svc_export *exp;
926 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
927 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
928 if (IS_ERR(ek))
929 return ERR_CAST(ek);
930
931 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
932 cache_put(&ek->h, nn->svc_expkey_cache);
933
934 if (IS_ERR(exp))
935 return ERR_CAST(exp);
936 return exp;
937}
938
939__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
940{
941 struct exp_flavor_info *f;
942 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
943
944 /* legacy gss-only clients are always OK: */
945 if (exp->ex_client == rqstp->rq_gssclient)
946 return 0;
947 /* ip-address based client; check sec= export option: */
948 for (f = exp->ex_flavors; f < end; f++) {
949 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
950 return 0;
951 }
952 /* defaults in absence of sec= options: */
953 if (exp->ex_nflavors == 0) {
954 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
955 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
956 return 0;
957 }
958
959 /* If the compound op contains a spo_must_allowed op,
960 * it will be sent with integrity/protection which
961 * will have to be expressly allowed on mounts that
962 * don't support it
963 */
964
965 if (nfsd4_spo_must_allow(rqstp))
966 return 0;
967
968 return nfserr_wrongsec;
969}
970
971/*
972 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
973 * auth_unix client) if it's available and has secinfo information;
974 * otherwise, will try to use rq_gssclient.
975 *
976 * Called from functions that handle requests; functions that do work on
977 * behalf of mountd are passed a single client name to use, and should
978 * use exp_get_by_name() or exp_find().
979 */
980struct svc_export *
981rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
982{
983 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
984 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
985 struct cache_detail *cd = nn->svc_export_cache;
986
987 if (rqstp->rq_client == NULL)
988 goto gss;
989
990 /* First try the auth_unix client: */
991 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
992 if (PTR_ERR(exp) == -ENOENT)
993 goto gss;
994 if (IS_ERR(exp))
995 return exp;
996 /* If it has secinfo, assume there are no gss/... clients */
997 if (exp->ex_nflavors > 0)
998 return exp;
999gss:
1000 /* Otherwise, try falling back on gss client */
1001 if (rqstp->rq_gssclient == NULL)
1002 return exp;
1003 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1004 if (PTR_ERR(gssexp) == -ENOENT)
1005 return exp;
1006 if (!IS_ERR(exp))
1007 exp_put(exp);
1008 return gssexp;
1009}
1010
1011struct svc_export *
1012rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1013{
1014 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1015 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1016 struct cache_detail *cd = nn->svc_export_cache;
1017
1018 if (rqstp->rq_client == NULL)
1019 goto gss;
1020
1021 /* First try the auth_unix client: */
1022 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1023 fsidv, &rqstp->rq_chandle);
1024 if (PTR_ERR(exp) == -ENOENT)
1025 goto gss;
1026 if (IS_ERR(exp))
1027 return exp;
1028 /* If it has secinfo, assume there are no gss/... clients */
1029 if (exp->ex_nflavors > 0)
1030 return exp;
1031gss:
1032 /* Otherwise, try falling back on gss client */
1033 if (rqstp->rq_gssclient == NULL)
1034 return exp;
1035 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1036 &rqstp->rq_chandle);
1037 if (PTR_ERR(gssexp) == -ENOENT)
1038 return exp;
1039 if (!IS_ERR(exp))
1040 exp_put(exp);
1041 return gssexp;
1042}
1043
1044struct svc_export *
1045rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1046{
1047 struct dentry *saved = dget(path->dentry);
1048 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1049
1050 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1051 struct dentry *parent = dget_parent(path->dentry);
1052 dput(path->dentry);
1053 path->dentry = parent;
1054 exp = rqst_exp_get_by_name(rqstp, path);
1055 }
1056 dput(path->dentry);
1057 path->dentry = saved;
1058 return exp;
1059}
1060
1061struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1062{
1063 u32 fsidv[2];
1064
1065 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1066
1067 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1068}
1069
1070/*
1071 * Called when we need the filehandle for the root of the pseudofs,
1072 * for a given NFSv4 client. The root is defined to be the
1073 * export point with fsid==0
1074 */
1075__be32
1076exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1077{
1078 struct svc_export *exp;
1079 __be32 rv;
1080
1081 exp = rqst_find_fsidzero_export(rqstp);
1082 if (IS_ERR(exp))
1083 return nfserrno(PTR_ERR(exp));
1084 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1085 exp_put(exp);
1086 return rv;
1087}
1088
1089static struct flags {
1090 int flag;
1091 char *name[2];
1092} expflags[] = {
1093 { NFSEXP_READONLY, {"ro", "rw"}},
1094 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1095 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1096 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1097 { NFSEXP_ASYNC, {"async", "sync"}},
1098 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1099 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1100 { NFSEXP_NOHIDE, {"nohide", ""}},
1101 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1102 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1103 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1104 { NFSEXP_V4ROOT, {"v4root", ""}},
1105 { NFSEXP_PNFS, {"pnfs", ""}},
1106 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1107 { 0, {"", ""}}
1108};
1109
1110static void show_expflags(struct seq_file *m, int flags, int mask)
1111{
1112 struct flags *flg;
1113 int state, first = 0;
1114
1115 for (flg = expflags; flg->flag; flg++) {
1116 if (flg->flag & ~mask)
1117 continue;
1118 state = (flg->flag & flags) ? 0 : 1;
1119 if (*flg->name[state])
1120 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1121 }
1122}
1123
1124static void show_secinfo_flags(struct seq_file *m, int flags)
1125{
1126 seq_printf(m, ",");
1127 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1128}
1129
1130static bool secinfo_flags_equal(int f, int g)
1131{
1132 f &= NFSEXP_SECINFO_FLAGS;
1133 g &= NFSEXP_SECINFO_FLAGS;
1134 return f == g;
1135}
1136
1137static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1138{
1139 int flags;
1140
1141 flags = (*fp)->flags;
1142 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1143 (*fp)++;
1144 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1145 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1146 (*fp)++;
1147 }
1148 return flags;
1149}
1150
1151static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1152{
1153 struct exp_flavor_info *f;
1154 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1155 int flags;
1156
1157 if (exp->ex_nflavors == 0)
1158 return;
1159 f = exp->ex_flavors;
1160 flags = show_secinfo_run(m, &f, end);
1161 if (!secinfo_flags_equal(flags, exp->ex_flags))
1162 show_secinfo_flags(m, flags);
1163 while (f != end) {
1164 flags = show_secinfo_run(m, &f, end);
1165 show_secinfo_flags(m, flags);
1166 }
1167}
1168
1169static void exp_flags(struct seq_file *m, int flag, int fsid,
1170 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1171{
1172 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1173 if (flag & NFSEXP_FSID)
1174 seq_printf(m, ",fsid=%d", fsid);
1175 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1176 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1177 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1178 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1179 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1180 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1181 if (fsloc && fsloc->locations_count > 0) {
1182 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1183 int i;
1184
1185 seq_printf(m, ",%s=", loctype);
1186 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1187 seq_putc(m, '@');
1188 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1189 for (i = 1; i < fsloc->locations_count; i++) {
1190 seq_putc(m, ';');
1191 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1192 seq_putc(m, '@');
1193 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1194 }
1195 }
1196}
1197
1198static int e_show(struct seq_file *m, void *p)
1199{
1200 struct cache_head *cp = p;
1201 struct svc_export *exp = container_of(cp, struct svc_export, h);
1202 struct cache_detail *cd = m->private;
1203
1204 if (p == SEQ_START_TOKEN) {
1205 seq_puts(m, "# Version 1.1\n");
1206 seq_puts(m, "# Path Client(Flags) # IPs\n");
1207 return 0;
1208 }
1209
1210 exp_get(exp);
1211 if (cache_check(cd, &exp->h, NULL))
1212 return 0;
1213 exp_put(exp);
1214 return svc_export_show(m, cd, cp);
1215}
1216
1217const struct seq_operations nfs_exports_op = {
1218 .start = cache_seq_start,
1219 .next = cache_seq_next,
1220 .stop = cache_seq_stop,
1221 .show = e_show,
1222};
1223
1224/*
1225 * Initialize the exports module.
1226 */
1227int
1228nfsd_export_init(struct net *net)
1229{
1230 int rv;
1231 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1232
1233 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1234
1235 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1236 if (IS_ERR(nn->svc_export_cache))
1237 return PTR_ERR(nn->svc_export_cache);
1238 rv = cache_register_net(nn->svc_export_cache, net);
1239 if (rv)
1240 goto destroy_export_cache;
1241
1242 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1243 if (IS_ERR(nn->svc_expkey_cache)) {
1244 rv = PTR_ERR(nn->svc_expkey_cache);
1245 goto unregister_export_cache;
1246 }
1247 rv = cache_register_net(nn->svc_expkey_cache, net);
1248 if (rv)
1249 goto destroy_expkey_cache;
1250 return 0;
1251
1252destroy_expkey_cache:
1253 cache_destroy_net(nn->svc_expkey_cache, net);
1254unregister_export_cache:
1255 cache_unregister_net(nn->svc_export_cache, net);
1256destroy_export_cache:
1257 cache_destroy_net(nn->svc_export_cache, net);
1258 return rv;
1259}
1260
1261/*
1262 * Flush exports table - called when last nfsd thread is killed
1263 */
1264void
1265nfsd_export_flush(struct net *net)
1266{
1267 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1268
1269 cache_purge(nn->svc_expkey_cache);
1270 cache_purge(nn->svc_export_cache);
1271}
1272
1273/*
1274 * Shutdown the exports module.
1275 */
1276void
1277nfsd_export_shutdown(struct net *net)
1278{
1279 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1280
1281 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1282
1283 cache_unregister_net(nn->svc_expkey_cache, net);
1284 cache_unregister_net(nn->svc_export_cache, net);
1285 cache_destroy_net(nn->svc_expkey_cache, net);
1286 cache_destroy_net(nn->svc_export_cache, net);
1287 svcauth_unix_purge(net);
1288
1289 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1290}