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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/*
2 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
14#include <linux/slab.h>
15#include <linux/namei.h>
16#include <linux/module.h>
17#include <linux/exportfs.h>
18#include <linux/sunrpc/svc_xprt.h>
19
20#include <net/ipv6.h>
21
22#include "nfsd.h"
23#include "nfsfh.h"
24#include "netns.h"
25
26#define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28typedef struct auth_domain svc_client;
29typedef struct svc_export svc_export;
30
31/*
32 * We have two caches.
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
35 *
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
38 */
39
40#define EXPKEY_HASHBITS 8
41#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
43
44static void expkey_put(struct kref *ref)
45{
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
52 kfree(key);
53}
54
55static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58{
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68}
69
70static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
71 struct svc_expkey *old);
72static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
73
74static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
75{
76 /* client fsidtype fsid [path] */
77 char *buf;
78 int len;
79 struct auth_domain *dom = NULL;
80 int err;
81 int fsidtype;
82 char *ep;
83 struct svc_expkey key;
84 struct svc_expkey *ek = NULL;
85
86 if (mesg[mlen - 1] != '\n')
87 return -EINVAL;
88 mesg[mlen-1] = 0;
89
90 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
91 err = -ENOMEM;
92 if (!buf)
93 goto out;
94
95 err = -EINVAL;
96 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
97 goto out;
98
99 err = -ENOENT;
100 dom = auth_domain_find(buf);
101 if (!dom)
102 goto out;
103 dprintk("found domain %s\n", buf);
104
105 err = -EINVAL;
106 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
107 goto out;
108 fsidtype = simple_strtoul(buf, &ep, 10);
109 if (*ep)
110 goto out;
111 dprintk("found fsidtype %d\n", fsidtype);
112 if (key_len(fsidtype)==0) /* invalid type */
113 goto out;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116 dprintk("found fsid length %d\n", len);
117 if (len != key_len(fsidtype))
118 goto out;
119
120 /* OK, we seem to have a valid key */
121 key.h.flags = 0;
122 key.h.expiry_time = get_expiry(&mesg);
123 if (key.h.expiry_time == 0)
124 goto out;
125
126 key.ek_client = dom;
127 key.ek_fsidtype = fsidtype;
128 memcpy(key.ek_fsid, buf, len);
129
130 ek = svc_expkey_lookup(cd, &key);
131 err = -ENOMEM;
132 if (!ek)
133 goto out;
134
135 /* now we want a pathname, or empty meaning NEGATIVE */
136 err = -EINVAL;
137 len = qword_get(&mesg, buf, PAGE_SIZE);
138 if (len < 0)
139 goto out;
140 dprintk("Path seems to be <%s>\n", buf);
141 err = 0;
142 if (len == 0) {
143 set_bit(CACHE_NEGATIVE, &key.h.flags);
144 ek = svc_expkey_update(cd, &key, ek);
145 if (!ek)
146 err = -ENOMEM;
147 } else {
148 err = kern_path(buf, 0, &key.ek_path);
149 if (err)
150 goto out;
151
152 dprintk("Found the path %s\n", buf);
153
154 ek = svc_expkey_update(cd, &key, ek);
155 if (!ek)
156 err = -ENOMEM;
157 path_put(&key.ek_path);
158 }
159 cache_flush();
160 out:
161 if (ek)
162 cache_put(&ek->h, cd);
163 if (dom)
164 auth_domain_put(dom);
165 kfree(buf);
166 return err;
167}
168
169static int expkey_show(struct seq_file *m,
170 struct cache_detail *cd,
171 struct cache_head *h)
172{
173 struct svc_expkey *ek ;
174 int i;
175
176 if (h ==NULL) {
177 seq_puts(m, "#domain fsidtype fsid [path]\n");
178 return 0;
179 }
180 ek = container_of(h, struct svc_expkey, h);
181 seq_printf(m, "%s %d 0x", ek->ek_client->name,
182 ek->ek_fsidtype);
183 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
184 seq_printf(m, "%08x", ek->ek_fsid[i]);
185 if (test_bit(CACHE_VALID, &h->flags) &&
186 !test_bit(CACHE_NEGATIVE, &h->flags)) {
187 seq_printf(m, " ");
188 seq_path(m, &ek->ek_path, "\\ \t\n");
189 }
190 seq_printf(m, "\n");
191 return 0;
192}
193
194static inline int expkey_match (struct cache_head *a, struct cache_head *b)
195{
196 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
197 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
198
199 if (orig->ek_fsidtype != new->ek_fsidtype ||
200 orig->ek_client != new->ek_client ||
201 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
202 return 0;
203 return 1;
204}
205
206static inline void expkey_init(struct cache_head *cnew,
207 struct cache_head *citem)
208{
209 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
210 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
211
212 kref_get(&item->ek_client->ref);
213 new->ek_client = item->ek_client;
214 new->ek_fsidtype = item->ek_fsidtype;
215
216 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
217}
218
219static inline void expkey_update(struct cache_head *cnew,
220 struct cache_head *citem)
221{
222 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
223 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
224
225 new->ek_path = item->ek_path;
226 path_get(&item->ek_path);
227}
228
229static struct cache_head *expkey_alloc(void)
230{
231 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
232 if (i)
233 return &i->h;
234 else
235 return NULL;
236}
237
238static struct cache_detail svc_expkey_cache_template = {
239 .owner = THIS_MODULE,
240 .hash_size = EXPKEY_HASHMAX,
241 .name = "nfsd.fh",
242 .cache_put = expkey_put,
243 .cache_request = expkey_request,
244 .cache_parse = expkey_parse,
245 .cache_show = expkey_show,
246 .match = expkey_match,
247 .init = expkey_init,
248 .update = expkey_update,
249 .alloc = expkey_alloc,
250};
251
252static int
253svc_expkey_hash(struct svc_expkey *item)
254{
255 int hash = item->ek_fsidtype;
256 char * cp = (char*)item->ek_fsid;
257 int len = key_len(item->ek_fsidtype);
258
259 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
260 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
261 hash &= EXPKEY_HASHMASK;
262 return hash;
263}
264
265static struct svc_expkey *
266svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
267{
268 struct cache_head *ch;
269 int hash = svc_expkey_hash(item);
270
271 ch = sunrpc_cache_lookup(cd, &item->h, hash);
272 if (ch)
273 return container_of(ch, struct svc_expkey, h);
274 else
275 return NULL;
276}
277
278static struct svc_expkey *
279svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
280 struct svc_expkey *old)
281{
282 struct cache_head *ch;
283 int hash = svc_expkey_hash(new);
284
285 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
286 if (ch)
287 return container_of(ch, struct svc_expkey, h);
288 else
289 return NULL;
290}
291
292
293#define EXPORT_HASHBITS 8
294#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
295
296static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
297{
298 int i;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(fsloc->locations[i].path);
302 kfree(fsloc->locations[i].hosts);
303 }
304 kfree(fsloc->locations);
305}
306
307static void svc_export_put(struct kref *ref)
308{
309 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
310 path_put(&exp->ex_path);
311 auth_domain_put(exp->ex_client);
312 nfsd4_fslocs_free(&exp->ex_fslocs);
313 kfree(exp->ex_uuid);
314 kfree(exp);
315}
316
317static void svc_export_request(struct cache_detail *cd,
318 struct cache_head *h,
319 char **bpp, int *blen)
320{
321 /* client path */
322 struct svc_export *exp = container_of(h, struct svc_export, h);
323 char *pth;
324
325 qword_add(bpp, blen, exp->ex_client->name);
326 pth = d_path(&exp->ex_path, *bpp, *blen);
327 if (IS_ERR(pth)) {
328 /* is this correct? */
329 (*bpp)[0] = '\n';
330 return;
331 }
332 qword_add(bpp, blen, pth);
333 (*bpp)[-1] = '\n';
334}
335
336static struct svc_export *svc_export_update(struct svc_export *new,
337 struct svc_export *old);
338static struct svc_export *svc_export_lookup(struct svc_export *);
339
340static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
341{
342
343 /*
344 * We currently export only dirs, regular files, and (for v4
345 * pseudoroot) symlinks.
346 */
347 if (!S_ISDIR(inode->i_mode) &&
348 !S_ISLNK(inode->i_mode) &&
349 !S_ISREG(inode->i_mode))
350 return -ENOTDIR;
351
352 /*
353 * Mountd should never pass down a writeable V4ROOT export, but,
354 * just to make sure:
355 */
356 if (*flags & NFSEXP_V4ROOT)
357 *flags |= NFSEXP_READONLY;
358
359 /* There are two requirements on a filesystem to be exportable.
360 * 1: We must be able to identify the filesystem from a number.
361 * either a device number (so FS_REQUIRES_DEV needed)
362 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
363 * 2: We must be able to find an inode from a filehandle.
364 * This means that s_export_op must be set.
365 */
366 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
367 !(*flags & NFSEXP_FSID) &&
368 uuid == NULL) {
369 dprintk("exp_export: export of non-dev fs without fsid\n");
370 return -EINVAL;
371 }
372
373 if (!inode->i_sb->s_export_op ||
374 !inode->i_sb->s_export_op->fh_to_dentry) {
375 dprintk("exp_export: export of invalid fs type.\n");
376 return -EINVAL;
377 }
378
379 return 0;
380
381}
382
383#ifdef CONFIG_NFSD_V4
384
385static int
386fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
387{
388 int len;
389 int migrated, i, err;
390
391 /* listsize */
392 err = get_uint(mesg, &fsloc->locations_count);
393 if (err)
394 return err;
395 if (fsloc->locations_count > MAX_FS_LOCATIONS)
396 return -EINVAL;
397 if (fsloc->locations_count == 0)
398 return 0;
399
400 fsloc->locations = kzalloc(fsloc->locations_count
401 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
402 if (!fsloc->locations)
403 return -ENOMEM;
404 for (i=0; i < fsloc->locations_count; i++) {
405 /* colon separated host list */
406 err = -EINVAL;
407 len = qword_get(mesg, buf, PAGE_SIZE);
408 if (len <= 0)
409 goto out_free_all;
410 err = -ENOMEM;
411 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
412 if (!fsloc->locations[i].hosts)
413 goto out_free_all;
414 err = -EINVAL;
415 /* slash separated path component list */
416 len = qword_get(mesg, buf, PAGE_SIZE);
417 if (len <= 0)
418 goto out_free_all;
419 err = -ENOMEM;
420 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
421 if (!fsloc->locations[i].path)
422 goto out_free_all;
423 }
424 /* migrated */
425 err = get_int(mesg, &migrated);
426 if (err)
427 goto out_free_all;
428 err = -EINVAL;
429 if (migrated < 0 || migrated > 1)
430 goto out_free_all;
431 fsloc->migrated = migrated;
432 return 0;
433out_free_all:
434 nfsd4_fslocs_free(fsloc);
435 return err;
436}
437
438static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
439{
440 int listsize, err;
441 struct exp_flavor_info *f;
442
443 err = get_int(mesg, &listsize);
444 if (err)
445 return err;
446 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
447 return -EINVAL;
448
449 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
450 err = get_uint(mesg, &f->pseudoflavor);
451 if (err)
452 return err;
453 /*
454 * XXX: It would be nice to also check whether this
455 * pseudoflavor is supported, so we can discover the
456 * problem at export time instead of when a client fails
457 * to authenticate.
458 */
459 err = get_uint(mesg, &f->flags);
460 if (err)
461 return err;
462 /* Only some flags are allowed to differ between flavors: */
463 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
464 return -EINVAL;
465 }
466 exp->ex_nflavors = listsize;
467 return 0;
468}
469
470#else /* CONFIG_NFSD_V4 */
471static inline int
472fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
473static inline int
474secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
475#endif
476
477static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
478{
479 /* client path expiry [flags anonuid anongid fsid] */
480 char *buf;
481 int len;
482 int err;
483 struct auth_domain *dom = NULL;
484 struct svc_export exp = {}, *expp;
485 int an_int;
486
487 if (mesg[mlen-1] != '\n')
488 return -EINVAL;
489 mesg[mlen-1] = 0;
490
491 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
492 if (!buf)
493 return -ENOMEM;
494
495 /* client */
496 err = -EINVAL;
497 len = qword_get(&mesg, buf, PAGE_SIZE);
498 if (len <= 0)
499 goto out;
500
501 err = -ENOENT;
502 dom = auth_domain_find(buf);
503 if (!dom)
504 goto out;
505
506 /* path */
507 err = -EINVAL;
508 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
509 goto out1;
510
511 err = kern_path(buf, 0, &exp.ex_path);
512 if (err)
513 goto out1;
514
515 exp.ex_client = dom;
516 exp.cd = cd;
517
518 /* expiry */
519 err = -EINVAL;
520 exp.h.expiry_time = get_expiry(&mesg);
521 if (exp.h.expiry_time == 0)
522 goto out3;
523
524 /* flags */
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT) {
527 err = 0;
528 set_bit(CACHE_NEGATIVE, &exp.h.flags);
529 } else {
530 if (err || an_int < 0)
531 goto out3;
532 exp.ex_flags= an_int;
533
534 /* anon uid */
535 err = get_int(&mesg, &an_int);
536 if (err)
537 goto out3;
538 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
539
540 /* anon gid */
541 err = get_int(&mesg, &an_int);
542 if (err)
543 goto out3;
544 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
545
546 /* fsid */
547 err = get_int(&mesg, &an_int);
548 if (err)
549 goto out3;
550 exp.ex_fsid = an_int;
551
552 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
553 if (strcmp(buf, "fsloc") == 0)
554 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
555 else if (strcmp(buf, "uuid") == 0) {
556 /* expect a 16 byte uuid encoded as \xXXXX... */
557 len = qword_get(&mesg, buf, PAGE_SIZE);
558 if (len != 16)
559 err = -EINVAL;
560 else {
561 exp.ex_uuid =
562 kmemdup(buf, 16, GFP_KERNEL);
563 if (exp.ex_uuid == NULL)
564 err = -ENOMEM;
565 }
566 } else if (strcmp(buf, "secinfo") == 0)
567 err = secinfo_parse(&mesg, buf, &exp);
568 else
569 /* quietly ignore unknown words and anything
570 * following. Newer user-space can try to set
571 * new values, then see what the result was.
572 */
573 break;
574 if (err)
575 goto out4;
576 }
577
578 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
579 exp.ex_uuid);
580 if (err)
581 goto out4;
582 /*
583 * No point caching this if it would immediately expire.
584 * Also, this protects exportfs's dummy export from the
585 * anon_uid/anon_gid checks:
586 */
587 if (exp.h.expiry_time < seconds_since_boot())
588 goto out4;
589 /*
590 * For some reason exportfs has been passing down an
591 * invalid (-1) uid & gid on the "dummy" export which it
592 * uses to test export support. To make sure exportfs
593 * sees errors from check_export we therefore need to
594 * delay these checks till after check_export:
595 */
596 err = -EINVAL;
597 if (!uid_valid(exp.ex_anon_uid))
598 goto out4;
599 if (!gid_valid(exp.ex_anon_gid))
600 goto out4;
601 err = 0;
602 }
603
604 expp = svc_export_lookup(&exp);
605 if (expp)
606 expp = svc_export_update(&exp, expp);
607 else
608 err = -ENOMEM;
609 cache_flush();
610 if (expp == NULL)
611 err = -ENOMEM;
612 else
613 exp_put(expp);
614out4:
615 nfsd4_fslocs_free(&exp.ex_fslocs);
616 kfree(exp.ex_uuid);
617out3:
618 path_put(&exp.ex_path);
619out1:
620 auth_domain_put(dom);
621out:
622 kfree(buf);
623 return err;
624}
625
626static void exp_flags(struct seq_file *m, int flag, int fsid,
627 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
628static void show_secinfo(struct seq_file *m, struct svc_export *exp);
629
630static int svc_export_show(struct seq_file *m,
631 struct cache_detail *cd,
632 struct cache_head *h)
633{
634 struct svc_export *exp ;
635
636 if (h ==NULL) {
637 seq_puts(m, "#path domain(flags)\n");
638 return 0;
639 }
640 exp = container_of(h, struct svc_export, h);
641 seq_path(m, &exp->ex_path, " \t\n\\");
642 seq_putc(m, '\t');
643 seq_escape(m, exp->ex_client->name, " \t\n\\");
644 seq_putc(m, '(');
645 if (test_bit(CACHE_VALID, &h->flags) &&
646 !test_bit(CACHE_NEGATIVE, &h->flags)) {
647 exp_flags(m, exp->ex_flags, exp->ex_fsid,
648 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
649 if (exp->ex_uuid) {
650 int i;
651 seq_puts(m, ",uuid=");
652 for (i=0; i<16; i++) {
653 if ((i&3) == 0 && i)
654 seq_putc(m, ':');
655 seq_printf(m, "%02x", exp->ex_uuid[i]);
656 }
657 }
658 show_secinfo(m, exp);
659 }
660 seq_puts(m, ")\n");
661 return 0;
662}
663static int svc_export_match(struct cache_head *a, struct cache_head *b)
664{
665 struct svc_export *orig = container_of(a, struct svc_export, h);
666 struct svc_export *new = container_of(b, struct svc_export, h);
667 return orig->ex_client == new->ex_client &&
668 orig->ex_path.dentry == new->ex_path.dentry &&
669 orig->ex_path.mnt == new->ex_path.mnt;
670}
671
672static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
673{
674 struct svc_export *new = container_of(cnew, struct svc_export, h);
675 struct svc_export *item = container_of(citem, struct svc_export, h);
676
677 kref_get(&item->ex_client->ref);
678 new->ex_client = item->ex_client;
679 new->ex_path.dentry = dget(item->ex_path.dentry);
680 new->ex_path.mnt = mntget(item->ex_path.mnt);
681 new->ex_fslocs.locations = NULL;
682 new->ex_fslocs.locations_count = 0;
683 new->ex_fslocs.migrated = 0;
684 new->ex_uuid = NULL;
685 new->cd = item->cd;
686}
687
688static void export_update(struct cache_head *cnew, struct cache_head *citem)
689{
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
692 int i;
693
694 new->ex_flags = item->ex_flags;
695 new->ex_anon_uid = item->ex_anon_uid;
696 new->ex_anon_gid = item->ex_anon_gid;
697 new->ex_fsid = item->ex_fsid;
698 new->ex_uuid = item->ex_uuid;
699 item->ex_uuid = NULL;
700 new->ex_fslocs.locations = item->ex_fslocs.locations;
701 item->ex_fslocs.locations = NULL;
702 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
703 item->ex_fslocs.locations_count = 0;
704 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
705 item->ex_fslocs.migrated = 0;
706 new->ex_nflavors = item->ex_nflavors;
707 for (i = 0; i < MAX_SECINFO_LIST; i++) {
708 new->ex_flavors[i] = item->ex_flavors[i];
709 }
710}
711
712static struct cache_head *svc_export_alloc(void)
713{
714 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
715 if (i)
716 return &i->h;
717 else
718 return NULL;
719}
720
721static struct cache_detail svc_export_cache_template = {
722 .owner = THIS_MODULE,
723 .hash_size = EXPORT_HASHMAX,
724 .name = "nfsd.export",
725 .cache_put = svc_export_put,
726 .cache_request = svc_export_request,
727 .cache_parse = svc_export_parse,
728 .cache_show = svc_export_show,
729 .match = svc_export_match,
730 .init = svc_export_init,
731 .update = export_update,
732 .alloc = svc_export_alloc,
733};
734
735static int
736svc_export_hash(struct svc_export *exp)
737{
738 int hash;
739
740 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
741 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
742 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
743 return hash;
744}
745
746static struct svc_export *
747svc_export_lookup(struct svc_export *exp)
748{
749 struct cache_head *ch;
750 int hash = svc_export_hash(exp);
751
752 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
753 if (ch)
754 return container_of(ch, struct svc_export, h);
755 else
756 return NULL;
757}
758
759static struct svc_export *
760svc_export_update(struct svc_export *new, struct svc_export *old)
761{
762 struct cache_head *ch;
763 int hash = svc_export_hash(old);
764
765 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
766 if (ch)
767 return container_of(ch, struct svc_export, h);
768 else
769 return NULL;
770}
771
772
773static struct svc_expkey *
774exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
775 u32 *fsidv, struct cache_req *reqp)
776{
777 struct svc_expkey key, *ek;
778 int err;
779
780 if (!clp)
781 return ERR_PTR(-ENOENT);
782
783 key.ek_client = clp;
784 key.ek_fsidtype = fsid_type;
785 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
786
787 ek = svc_expkey_lookup(cd, &key);
788 if (ek == NULL)
789 return ERR_PTR(-ENOMEM);
790 err = cache_check(cd, &ek->h, reqp);
791 if (err)
792 return ERR_PTR(err);
793 return ek;
794}
795
796
797static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
798 const struct path *path, struct cache_req *reqp)
799{
800 struct svc_export *exp, key;
801 int err;
802
803 if (!clp)
804 return ERR_PTR(-ENOENT);
805
806 key.ex_client = clp;
807 key.ex_path = *path;
808 key.cd = cd;
809
810 exp = svc_export_lookup(&key);
811 if (exp == NULL)
812 return ERR_PTR(-ENOMEM);
813 err = cache_check(cd, &exp->h, reqp);
814 if (err)
815 return ERR_PTR(err);
816 return exp;
817}
818
819/*
820 * Find the export entry for a given dentry.
821 */
822static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
823 struct path *path)
824{
825 struct dentry *saved = dget(path->dentry);
826 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
827
828 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
829 struct dentry *parent = dget_parent(path->dentry);
830 dput(path->dentry);
831 path->dentry = parent;
832 exp = exp_get_by_name(cd, clp, path, NULL);
833 }
834 dput(path->dentry);
835 path->dentry = saved;
836 return exp;
837}
838
839
840
841/*
842 * Obtain the root fh on behalf of a client.
843 * This could be done in user space, but I feel that it adds some safety
844 * since its harder to fool a kernel module than a user space program.
845 */
846int
847exp_rootfh(struct net *net, svc_client *clp, char *name,
848 struct knfsd_fh *f, int maxsize)
849{
850 struct svc_export *exp;
851 struct path path;
852 struct inode *inode;
853 struct svc_fh fh;
854 int err;
855 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
856 struct cache_detail *cd = nn->svc_export_cache;
857
858 err = -EPERM;
859 /* NB: we probably ought to check that it's NUL-terminated */
860 if (kern_path(name, 0, &path)) {
861 printk("nfsd: exp_rootfh path not found %s", name);
862 return err;
863 }
864 inode = path.dentry->d_inode;
865
866 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
867 name, path.dentry, clp->name,
868 inode->i_sb->s_id, inode->i_ino);
869 exp = exp_parent(cd, clp, &path);
870 if (IS_ERR(exp)) {
871 err = PTR_ERR(exp);
872 goto out;
873 }
874
875 /*
876 * fh must be initialized before calling fh_compose
877 */
878 fh_init(&fh, maxsize);
879 if (fh_compose(&fh, exp, path.dentry, NULL))
880 err = -EINVAL;
881 else
882 err = 0;
883 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
884 fh_put(&fh);
885 exp_put(exp);
886out:
887 path_put(&path);
888 return err;
889}
890
891static struct svc_export *exp_find(struct cache_detail *cd,
892 struct auth_domain *clp, int fsid_type,
893 u32 *fsidv, struct cache_req *reqp)
894{
895 struct svc_export *exp;
896 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
897 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
898 if (IS_ERR(ek))
899 return ERR_CAST(ek);
900
901 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
902 cache_put(&ek->h, nn->svc_expkey_cache);
903
904 if (IS_ERR(exp))
905 return ERR_CAST(exp);
906 return exp;
907}
908
909__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
910{
911 struct exp_flavor_info *f;
912 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
913
914 /* legacy gss-only clients are always OK: */
915 if (exp->ex_client == rqstp->rq_gssclient)
916 return 0;
917 /* ip-address based client; check sec= export option: */
918 for (f = exp->ex_flavors; f < end; f++) {
919 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
920 return 0;
921 }
922 /* defaults in absence of sec= options: */
923 if (exp->ex_nflavors == 0) {
924 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
925 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
926 return 0;
927 }
928 return nfserr_wrongsec;
929}
930
931/*
932 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
933 * auth_unix client) if it's available and has secinfo information;
934 * otherwise, will try to use rq_gssclient.
935 *
936 * Called from functions that handle requests; functions that do work on
937 * behalf of mountd are passed a single client name to use, and should
938 * use exp_get_by_name() or exp_find().
939 */
940struct svc_export *
941rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
942{
943 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
944 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
945 struct cache_detail *cd = nn->svc_export_cache;
946
947 if (rqstp->rq_client == NULL)
948 goto gss;
949
950 /* First try the auth_unix client: */
951 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
952 if (PTR_ERR(exp) == -ENOENT)
953 goto gss;
954 if (IS_ERR(exp))
955 return exp;
956 /* If it has secinfo, assume there are no gss/... clients */
957 if (exp->ex_nflavors > 0)
958 return exp;
959gss:
960 /* Otherwise, try falling back on gss client */
961 if (rqstp->rq_gssclient == NULL)
962 return exp;
963 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
964 if (PTR_ERR(gssexp) == -ENOENT)
965 return exp;
966 if (!IS_ERR(exp))
967 exp_put(exp);
968 return gssexp;
969}
970
971struct svc_export *
972rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
973{
974 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
975 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
976 struct cache_detail *cd = nn->svc_export_cache;
977
978 if (rqstp->rq_client == NULL)
979 goto gss;
980
981 /* First try the auth_unix client: */
982 exp = exp_find(cd, rqstp->rq_client, fsid_type,
983 fsidv, &rqstp->rq_chandle);
984 if (PTR_ERR(exp) == -ENOENT)
985 goto gss;
986 if (IS_ERR(exp))
987 return exp;
988 /* If it has secinfo, assume there are no gss/... clients */
989 if (exp->ex_nflavors > 0)
990 return exp;
991gss:
992 /* Otherwise, try falling back on gss client */
993 if (rqstp->rq_gssclient == NULL)
994 return exp;
995 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
996 &rqstp->rq_chandle);
997 if (PTR_ERR(gssexp) == -ENOENT)
998 return exp;
999 if (!IS_ERR(exp))
1000 exp_put(exp);
1001 return gssexp;
1002}
1003
1004struct svc_export *
1005rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1006{
1007 struct dentry *saved = dget(path->dentry);
1008 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1009
1010 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1011 struct dentry *parent = dget_parent(path->dentry);
1012 dput(path->dentry);
1013 path->dentry = parent;
1014 exp = rqst_exp_get_by_name(rqstp, path);
1015 }
1016 dput(path->dentry);
1017 path->dentry = saved;
1018 return exp;
1019}
1020
1021struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1022{
1023 u32 fsidv[2];
1024
1025 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1026
1027 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1028}
1029
1030/*
1031 * Called when we need the filehandle for the root of the pseudofs,
1032 * for a given NFSv4 client. The root is defined to be the
1033 * export point with fsid==0
1034 */
1035__be32
1036exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1037{
1038 struct svc_export *exp;
1039 __be32 rv;
1040
1041 exp = rqst_find_fsidzero_export(rqstp);
1042 if (IS_ERR(exp))
1043 return nfserrno(PTR_ERR(exp));
1044 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1045 exp_put(exp);
1046 return rv;
1047}
1048
1049/* Iterator */
1050
1051static void *e_start(struct seq_file *m, loff_t *pos)
1052 __acquires(((struct cache_detail *)m->private)->hash_lock)
1053{
1054 loff_t n = *pos;
1055 unsigned hash, export;
1056 struct cache_head *ch;
1057 struct cache_detail *cd = m->private;
1058 struct cache_head **export_table = cd->hash_table;
1059
1060 read_lock(&cd->hash_lock);
1061 if (!n--)
1062 return SEQ_START_TOKEN;
1063 hash = n >> 32;
1064 export = n & ((1LL<<32) - 1);
1065
1066
1067 for (ch=export_table[hash]; ch; ch=ch->next)
1068 if (!export--)
1069 return ch;
1070 n &= ~((1LL<<32) - 1);
1071 do {
1072 hash++;
1073 n += 1LL<<32;
1074 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1075 if (hash >= EXPORT_HASHMAX)
1076 return NULL;
1077 *pos = n+1;
1078 return export_table[hash];
1079}
1080
1081static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1082{
1083 struct cache_head *ch = p;
1084 int hash = (*pos >> 32);
1085 struct cache_detail *cd = m->private;
1086 struct cache_head **export_table = cd->hash_table;
1087
1088 if (p == SEQ_START_TOKEN)
1089 hash = 0;
1090 else if (ch->next == NULL) {
1091 hash++;
1092 *pos += 1LL<<32;
1093 } else {
1094 ++*pos;
1095 return ch->next;
1096 }
1097 *pos &= ~((1LL<<32) - 1);
1098 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1099 hash++;
1100 *pos += 1LL<<32;
1101 }
1102 if (hash >= EXPORT_HASHMAX)
1103 return NULL;
1104 ++*pos;
1105 return export_table[hash];
1106}
1107
1108static void e_stop(struct seq_file *m, void *p)
1109 __releases(((struct cache_detail *)m->private)->hash_lock)
1110{
1111 struct cache_detail *cd = m->private;
1112
1113 read_unlock(&cd->hash_lock);
1114}
1115
1116static struct flags {
1117 int flag;
1118 char *name[2];
1119} expflags[] = {
1120 { NFSEXP_READONLY, {"ro", "rw"}},
1121 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1122 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1123 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1124 { NFSEXP_ASYNC, {"async", "sync"}},
1125 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1126 { NFSEXP_NOHIDE, {"nohide", ""}},
1127 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1128 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1129 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1130 { NFSEXP_V4ROOT, {"v4root", ""}},
1131 { 0, {"", ""}}
1132};
1133
1134static void show_expflags(struct seq_file *m, int flags, int mask)
1135{
1136 struct flags *flg;
1137 int state, first = 0;
1138
1139 for (flg = expflags; flg->flag; flg++) {
1140 if (flg->flag & ~mask)
1141 continue;
1142 state = (flg->flag & flags) ? 0 : 1;
1143 if (*flg->name[state])
1144 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1145 }
1146}
1147
1148static void show_secinfo_flags(struct seq_file *m, int flags)
1149{
1150 seq_printf(m, ",");
1151 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1152}
1153
1154static bool secinfo_flags_equal(int f, int g)
1155{
1156 f &= NFSEXP_SECINFO_FLAGS;
1157 g &= NFSEXP_SECINFO_FLAGS;
1158 return f == g;
1159}
1160
1161static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1162{
1163 int flags;
1164
1165 flags = (*fp)->flags;
1166 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1167 (*fp)++;
1168 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1169 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1170 (*fp)++;
1171 }
1172 return flags;
1173}
1174
1175static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1176{
1177 struct exp_flavor_info *f;
1178 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1179 int flags;
1180
1181 if (exp->ex_nflavors == 0)
1182 return;
1183 f = exp->ex_flavors;
1184 flags = show_secinfo_run(m, &f, end);
1185 if (!secinfo_flags_equal(flags, exp->ex_flags))
1186 show_secinfo_flags(m, flags);
1187 while (f != end) {
1188 flags = show_secinfo_run(m, &f, end);
1189 show_secinfo_flags(m, flags);
1190 }
1191}
1192
1193static void exp_flags(struct seq_file *m, int flag, int fsid,
1194 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1195{
1196 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1197 if (flag & NFSEXP_FSID)
1198 seq_printf(m, ",fsid=%d", fsid);
1199 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1200 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1201 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1202 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1203 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1204 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1205 if (fsloc && fsloc->locations_count > 0) {
1206 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1207 int i;
1208
1209 seq_printf(m, ",%s=", loctype);
1210 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1211 seq_putc(m, '@');
1212 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1213 for (i = 1; i < fsloc->locations_count; i++) {
1214 seq_putc(m, ';');
1215 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1216 seq_putc(m, '@');
1217 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1218 }
1219 }
1220}
1221
1222static int e_show(struct seq_file *m, void *p)
1223{
1224 struct cache_head *cp = p;
1225 struct svc_export *exp = container_of(cp, struct svc_export, h);
1226 struct cache_detail *cd = m->private;
1227
1228 if (p == SEQ_START_TOKEN) {
1229 seq_puts(m, "# Version 1.1\n");
1230 seq_puts(m, "# Path Client(Flags) # IPs\n");
1231 return 0;
1232 }
1233
1234 cache_get(&exp->h);
1235 if (cache_check(cd, &exp->h, NULL))
1236 return 0;
1237 exp_put(exp);
1238 return svc_export_show(m, cd, cp);
1239}
1240
1241const struct seq_operations nfs_exports_op = {
1242 .start = e_start,
1243 .next = e_next,
1244 .stop = e_stop,
1245 .show = e_show,
1246};
1247
1248/*
1249 * Initialize the exports module.
1250 */
1251int
1252nfsd_export_init(struct net *net)
1253{
1254 int rv;
1255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
1257 dprintk("nfsd: initializing export module (net: %p).\n", net);
1258
1259 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1260 if (IS_ERR(nn->svc_export_cache))
1261 return PTR_ERR(nn->svc_export_cache);
1262 rv = cache_register_net(nn->svc_export_cache, net);
1263 if (rv)
1264 goto destroy_export_cache;
1265
1266 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1267 if (IS_ERR(nn->svc_expkey_cache)) {
1268 rv = PTR_ERR(nn->svc_expkey_cache);
1269 goto unregister_export_cache;
1270 }
1271 rv = cache_register_net(nn->svc_expkey_cache, net);
1272 if (rv)
1273 goto destroy_expkey_cache;
1274 return 0;
1275
1276destroy_expkey_cache:
1277 cache_destroy_net(nn->svc_expkey_cache, net);
1278unregister_export_cache:
1279 cache_unregister_net(nn->svc_export_cache, net);
1280destroy_export_cache:
1281 cache_destroy_net(nn->svc_export_cache, net);
1282 return rv;
1283}
1284
1285/*
1286 * Flush exports table - called when last nfsd thread is killed
1287 */
1288void
1289nfsd_export_flush(struct net *net)
1290{
1291 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1292
1293 cache_purge(nn->svc_expkey_cache);
1294 cache_purge(nn->svc_export_cache);
1295}
1296
1297/*
1298 * Shutdown the exports module.
1299 */
1300void
1301nfsd_export_shutdown(struct net *net)
1302{
1303 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1304
1305 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1306
1307 cache_unregister_net(nn->svc_expkey_cache, net);
1308 cache_unregister_net(nn->svc_export_cache, net);
1309 cache_destroy_net(nn->svc_expkey_cache, net);
1310 cache_destroy_net(nn->svc_export_cache, net);
1311 svcauth_unix_purge(net);
1312
1313 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1314}