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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#include "trace.h"
27
28#define NFSDDBG_FACILITY NFSDDBG_EXPORT
29
30/*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39#define EXPKEY_HASHBITS 8
40#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42
43static void expkey_put(struct kref *ref)
44{
45 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
46
47 if (test_bit(CACHE_VALID, &key->h.flags) &&
48 !test_bit(CACHE_NEGATIVE, &key->h.flags))
49 path_put(&key->ek_path);
50 auth_domain_put(key->ek_client);
51 kfree_rcu(key, ek_rcu);
52}
53
54static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
55{
56 return sunrpc_cache_pipe_upcall(cd, h);
57}
58
59static void expkey_request(struct cache_detail *cd,
60 struct cache_head *h,
61 char **bpp, int *blen)
62{
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
71 (*bpp)[-1] = '\n';
72}
73
74static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
75 struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
77
78static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
79{
80 /* client fsidtype fsid expiry [path] */
81 char *buf;
82 int len;
83 struct auth_domain *dom = NULL;
84 int err;
85 int fsidtype;
86 char *ep;
87 struct svc_expkey key;
88 struct svc_expkey *ek = NULL;
89
90 if (mesg[mlen - 1] != '\n')
91 return -EINVAL;
92 mesg[mlen-1] = 0;
93
94 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 err = -ENOMEM;
96 if (!buf)
97 goto out;
98
99 err = -EINVAL;
100 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
111 goto out;
112 fsidtype = simple_strtoul(buf, &ep, 10);
113 if (*ep)
114 goto out;
115 dprintk("found fsidtype %d\n", fsidtype);
116 if (key_len(fsidtype)==0) /* invalid type */
117 goto out;
118 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
119 goto out;
120 dprintk("found fsid length %d\n", len);
121 if (len != key_len(fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 err = get_expiry(&mesg, &key.h.expiry_time);
127 if (err)
128 goto out;
129
130 key.ek_client = dom;
131 key.ek_fsidtype = fsidtype;
132 memcpy(key.ek_fsid, buf, len);
133
134 ek = svc_expkey_lookup(cd, &key);
135 err = -ENOMEM;
136 if (!ek)
137 goto out;
138
139 /* now we want a pathname, or empty meaning NEGATIVE */
140 err = -EINVAL;
141 len = qword_get(&mesg, buf, PAGE_SIZE);
142 if (len < 0)
143 goto out;
144 dprintk("Path seems to be <%s>\n", buf);
145 err = 0;
146 if (len == 0) {
147 set_bit(CACHE_NEGATIVE, &key.h.flags);
148 ek = svc_expkey_update(cd, &key, ek);
149 if (ek)
150 trace_nfsd_expkey_update(ek, NULL);
151 else
152 err = -ENOMEM;
153 } else {
154 err = kern_path(buf, 0, &key.ek_path);
155 if (err)
156 goto out;
157
158 dprintk("Found the path %s\n", buf);
159
160 ek = svc_expkey_update(cd, &key, ek);
161 if (ek)
162 trace_nfsd_expkey_update(ek, buf);
163 else
164 err = -ENOMEM;
165 path_put(&key.ek_path);
166 }
167 cache_flush();
168 out:
169 if (ek)
170 cache_put(&ek->h, cd);
171 if (dom)
172 auth_domain_put(dom);
173 kfree(buf);
174 return err;
175}
176
177static int expkey_show(struct seq_file *m,
178 struct cache_detail *cd,
179 struct cache_head *h)
180{
181 struct svc_expkey *ek ;
182 int i;
183
184 if (h ==NULL) {
185 seq_puts(m, "#domain fsidtype fsid [path]\n");
186 return 0;
187 }
188 ek = container_of(h, struct svc_expkey, h);
189 seq_printf(m, "%s %d 0x", ek->ek_client->name,
190 ek->ek_fsidtype);
191 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
192 seq_printf(m, "%08x", ek->ek_fsid[i]);
193 if (test_bit(CACHE_VALID, &h->flags) &&
194 !test_bit(CACHE_NEGATIVE, &h->flags)) {
195 seq_printf(m, " ");
196 seq_path(m, &ek->ek_path, "\\ \t\n");
197 }
198 seq_printf(m, "\n");
199 return 0;
200}
201
202static inline int expkey_match (struct cache_head *a, struct cache_head *b)
203{
204 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
205 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
206
207 if (orig->ek_fsidtype != new->ek_fsidtype ||
208 orig->ek_client != new->ek_client ||
209 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
210 return 0;
211 return 1;
212}
213
214static inline void expkey_init(struct cache_head *cnew,
215 struct cache_head *citem)
216{
217 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
218 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
219
220 kref_get(&item->ek_client->ref);
221 new->ek_client = item->ek_client;
222 new->ek_fsidtype = item->ek_fsidtype;
223
224 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
225}
226
227static inline void expkey_update(struct cache_head *cnew,
228 struct cache_head *citem)
229{
230 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
231 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
232
233 new->ek_path = item->ek_path;
234 path_get(&item->ek_path);
235}
236
237static struct cache_head *expkey_alloc(void)
238{
239 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
240 if (i)
241 return &i->h;
242 else
243 return NULL;
244}
245
246static void expkey_flush(void)
247{
248 /*
249 * Take the nfsd_mutex here to ensure that the file cache is not
250 * destroyed while we're in the middle of flushing.
251 */
252 mutex_lock(&nfsd_mutex);
253 nfsd_file_cache_purge(current->nsproxy->net_ns);
254 mutex_unlock(&nfsd_mutex);
255}
256
257static const struct cache_detail svc_expkey_cache_template = {
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_upcall = expkey_upcall,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
270 .flush = expkey_flush,
271};
272
273static int
274svc_expkey_hash(struct svc_expkey *item)
275{
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
283 return hash;
284}
285
286static struct svc_expkey *
287svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
288{
289 struct cache_head *ch;
290 int hash = svc_expkey_hash(item);
291
292 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297}
298
299static struct svc_expkey *
300svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
301 struct svc_expkey *old)
302{
303 struct cache_head *ch;
304 int hash = svc_expkey_hash(new);
305
306 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
307 if (ch)
308 return container_of(ch, struct svc_expkey, h);
309 else
310 return NULL;
311}
312
313
314#define EXPORT_HASHBITS 8
315#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
316
317static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
318{
319 struct nfsd4_fs_location *locations = fsloc->locations;
320 int i;
321
322 if (!locations)
323 return;
324
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(locations[i].path);
327 kfree(locations[i].hosts);
328 }
329
330 kfree(locations);
331 fsloc->locations = NULL;
332}
333
334static int export_stats_init(struct export_stats *stats)
335{
336 stats->start_time = ktime_get_seconds();
337 return percpu_counter_init_many(stats->counter, 0, GFP_KERNEL,
338 EXP_STATS_COUNTERS_NUM);
339}
340
341static void export_stats_reset(struct export_stats *stats)
342{
343 if (stats) {
344 int i;
345
346 for (i = 0; i < EXP_STATS_COUNTERS_NUM; i++)
347 percpu_counter_set(&stats->counter[i], 0);
348 }
349}
350
351static void export_stats_destroy(struct export_stats *stats)
352{
353 if (stats)
354 percpu_counter_destroy_many(stats->counter,
355 EXP_STATS_COUNTERS_NUM);
356}
357
358static void svc_export_put(struct kref *ref)
359{
360 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
361 path_put(&exp->ex_path);
362 auth_domain_put(exp->ex_client);
363 nfsd4_fslocs_free(&exp->ex_fslocs);
364 export_stats_destroy(exp->ex_stats);
365 kfree(exp->ex_stats);
366 kfree(exp->ex_uuid);
367 kfree_rcu(exp, ex_rcu);
368}
369
370static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
371{
372 return sunrpc_cache_pipe_upcall(cd, h);
373}
374
375static void svc_export_request(struct cache_detail *cd,
376 struct cache_head *h,
377 char **bpp, int *blen)
378{
379 /* client path */
380 struct svc_export *exp = container_of(h, struct svc_export, h);
381 char *pth;
382
383 qword_add(bpp, blen, exp->ex_client->name);
384 pth = d_path(&exp->ex_path, *bpp, *blen);
385 if (IS_ERR(pth)) {
386 /* is this correct? */
387 (*bpp)[0] = '\n';
388 return;
389 }
390 qword_add(bpp, blen, pth);
391 (*bpp)[-1] = '\n';
392}
393
394static struct svc_export *svc_export_update(struct svc_export *new,
395 struct svc_export *old);
396static struct svc_export *svc_export_lookup(struct svc_export *);
397
398static int check_export(struct path *path, int *flags, unsigned char *uuid)
399{
400 struct inode *inode = d_inode(path->dentry);
401
402 /*
403 * We currently export only dirs, regular files, and (for v4
404 * pseudoroot) symlinks.
405 */
406 if (!S_ISDIR(inode->i_mode) &&
407 !S_ISLNK(inode->i_mode) &&
408 !S_ISREG(inode->i_mode))
409 return -ENOTDIR;
410
411 /*
412 * Mountd should never pass down a writeable V4ROOT export, but,
413 * just to make sure:
414 */
415 if (*flags & NFSEXP_V4ROOT)
416 *flags |= NFSEXP_READONLY;
417
418 /* There are two requirements on a filesystem to be exportable.
419 * 1: We must be able to identify the filesystem from a number.
420 * either a device number (so FS_REQUIRES_DEV needed)
421 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
422 * 2: We must be able to find an inode from a filehandle.
423 * This means that s_export_op must be set.
424 * 3: We must not currently be on an idmapped mount.
425 */
426 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
427 !(*flags & NFSEXP_FSID) &&
428 uuid == NULL) {
429 dprintk("exp_export: export of non-dev fs without fsid\n");
430 return -EINVAL;
431 }
432
433 if (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) {
434 dprintk("exp_export: export of invalid fs type.\n");
435 return -EINVAL;
436 }
437
438 if (is_idmapped_mnt(path->mnt)) {
439 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
440 return -EINVAL;
441 }
442
443 if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
444 !(*flags & NFSEXP_NOSUBTREECHECK)) {
445 dprintk("%s: %s does not support subtree checking!\n",
446 __func__, inode->i_sb->s_type->name);
447 return -EINVAL;
448 }
449 return 0;
450}
451
452#ifdef CONFIG_NFSD_V4
453
454static int
455fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
456{
457 int len;
458 int migrated, i, err;
459
460 /* more than one fsloc */
461 if (fsloc->locations)
462 return -EINVAL;
463
464 /* listsize */
465 err = get_uint(mesg, &fsloc->locations_count);
466 if (err)
467 return err;
468 if (fsloc->locations_count > MAX_FS_LOCATIONS)
469 return -EINVAL;
470 if (fsloc->locations_count == 0)
471 return 0;
472
473 fsloc->locations = kcalloc(fsloc->locations_count,
474 sizeof(struct nfsd4_fs_location),
475 GFP_KERNEL);
476 if (!fsloc->locations)
477 return -ENOMEM;
478 for (i=0; i < fsloc->locations_count; i++) {
479 /* colon separated host list */
480 err = -EINVAL;
481 len = qword_get(mesg, buf, PAGE_SIZE);
482 if (len <= 0)
483 goto out_free_all;
484 err = -ENOMEM;
485 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
486 if (!fsloc->locations[i].hosts)
487 goto out_free_all;
488 err = -EINVAL;
489 /* slash separated path component list */
490 len = qword_get(mesg, buf, PAGE_SIZE);
491 if (len <= 0)
492 goto out_free_all;
493 err = -ENOMEM;
494 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
495 if (!fsloc->locations[i].path)
496 goto out_free_all;
497 }
498 /* migrated */
499 err = get_int(mesg, &migrated);
500 if (err)
501 goto out_free_all;
502 err = -EINVAL;
503 if (migrated < 0 || migrated > 1)
504 goto out_free_all;
505 fsloc->migrated = migrated;
506 return 0;
507out_free_all:
508 nfsd4_fslocs_free(fsloc);
509 return err;
510}
511
512static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
513{
514 struct exp_flavor_info *f;
515 u32 listsize;
516 int err;
517
518 /* more than one secinfo */
519 if (exp->ex_nflavors)
520 return -EINVAL;
521
522 err = get_uint(mesg, &listsize);
523 if (err)
524 return err;
525 if (listsize > MAX_SECINFO_LIST)
526 return -EINVAL;
527
528 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
529 err = get_uint(mesg, &f->pseudoflavor);
530 if (err)
531 return err;
532 /*
533 * XXX: It would be nice to also check whether this
534 * pseudoflavor is supported, so we can discover the
535 * problem at export time instead of when a client fails
536 * to authenticate.
537 */
538 err = get_uint(mesg, &f->flags);
539 if (err)
540 return err;
541 /* Only some flags are allowed to differ between flavors: */
542 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
543 return -EINVAL;
544 }
545 exp->ex_nflavors = listsize;
546 return 0;
547}
548
549#else /* CONFIG_NFSD_V4 */
550static inline int
551fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
552static inline int
553secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
554#endif
555
556static int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp)
557{
558 unsigned int i, mode, listsize;
559 int err;
560
561 err = get_uint(mesg, &listsize);
562 if (err)
563 return err;
564 if (listsize > NFSEXP_XPRTSEC_NUM)
565 return -EINVAL;
566
567 exp->ex_xprtsec_modes = 0;
568 for (i = 0; i < listsize; i++) {
569 err = get_uint(mesg, &mode);
570 if (err)
571 return err;
572 if (mode > NFSEXP_XPRTSEC_MTLS)
573 return -EINVAL;
574 exp->ex_xprtsec_modes |= mode;
575 }
576 return 0;
577}
578
579static inline int
580nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
581{
582 int len;
583
584 /* more than one uuid */
585 if (*puuid)
586 return -EINVAL;
587
588 /* expect a 16 byte uuid encoded as \xXXXX... */
589 len = qword_get(mesg, buf, PAGE_SIZE);
590 if (len != EX_UUID_LEN)
591 return -EINVAL;
592
593 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
594 if (*puuid == NULL)
595 return -ENOMEM;
596
597 return 0;
598}
599
600static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
601{
602 /* client path expiry [flags anonuid anongid fsid] */
603 char *buf;
604 int err;
605 struct auth_domain *dom = NULL;
606 struct svc_export exp = {}, *expp;
607 int an_int;
608
609 if (mesg[mlen-1] != '\n')
610 return -EINVAL;
611 mesg[mlen-1] = 0;
612
613 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
614 if (!buf)
615 return -ENOMEM;
616
617 /* client */
618 err = -EINVAL;
619 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
620 goto out;
621
622 err = -ENOENT;
623 dom = auth_domain_find(buf);
624 if (!dom)
625 goto out;
626
627 /* path */
628 err = -EINVAL;
629 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
630 goto out1;
631
632 err = kern_path(buf, 0, &exp.ex_path);
633 if (err)
634 goto out1;
635
636 exp.ex_client = dom;
637 exp.cd = cd;
638 exp.ex_devid_map = NULL;
639 exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL;
640
641 /* expiry */
642 err = get_expiry(&mesg, &exp.h.expiry_time);
643 if (err)
644 goto out3;
645
646 /* flags */
647 err = get_int(&mesg, &an_int);
648 if (err == -ENOENT) {
649 err = 0;
650 set_bit(CACHE_NEGATIVE, &exp.h.flags);
651 } else {
652 if (err || an_int < 0)
653 goto out3;
654 exp.ex_flags= an_int;
655
656 /* anon uid */
657 err = get_int(&mesg, &an_int);
658 if (err)
659 goto out3;
660 exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
661
662 /* anon gid */
663 err = get_int(&mesg, &an_int);
664 if (err)
665 goto out3;
666 exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
667
668 /* fsid */
669 err = get_int(&mesg, &an_int);
670 if (err)
671 goto out3;
672 exp.ex_fsid = an_int;
673
674 while (qword_get(&mesg, buf, PAGE_SIZE) > 0) {
675 if (strcmp(buf, "fsloc") == 0)
676 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
677 else if (strcmp(buf, "uuid") == 0)
678 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
679 else if (strcmp(buf, "secinfo") == 0)
680 err = secinfo_parse(&mesg, buf, &exp);
681 else if (strcmp(buf, "xprtsec") == 0)
682 err = xprtsec_parse(&mesg, buf, &exp);
683 else
684 /* quietly ignore unknown words and anything
685 * following. Newer user-space can try to set
686 * new values, then see what the result was.
687 */
688 break;
689 if (err)
690 goto out4;
691 }
692
693 err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
694 if (err)
695 goto out4;
696
697 /*
698 * No point caching this if it would immediately expire.
699 * Also, this protects exportfs's dummy export from the
700 * anon_uid/anon_gid checks:
701 */
702 if (exp.h.expiry_time < seconds_since_boot())
703 goto out4;
704 /*
705 * For some reason exportfs has been passing down an
706 * invalid (-1) uid & gid on the "dummy" export which it
707 * uses to test export support. To make sure exportfs
708 * sees errors from check_export we therefore need to
709 * delay these checks till after check_export:
710 */
711 err = -EINVAL;
712 if (!uid_valid(exp.ex_anon_uid))
713 goto out4;
714 if (!gid_valid(exp.ex_anon_gid))
715 goto out4;
716 err = 0;
717
718 nfsd4_setup_layout_type(&exp);
719 }
720
721 expp = svc_export_lookup(&exp);
722 if (!expp) {
723 err = -ENOMEM;
724 goto out4;
725 }
726 expp = svc_export_update(&exp, expp);
727 if (expp) {
728 trace_nfsd_export_update(expp);
729 cache_flush();
730 exp_put(expp);
731 } else
732 err = -ENOMEM;
733out4:
734 nfsd4_fslocs_free(&exp.ex_fslocs);
735 kfree(exp.ex_uuid);
736out3:
737 path_put(&exp.ex_path);
738out1:
739 auth_domain_put(dom);
740out:
741 kfree(buf);
742 return err;
743}
744
745static void exp_flags(struct seq_file *m, int flag, int fsid,
746 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
747static void show_secinfo(struct seq_file *m, struct svc_export *exp);
748
749static int is_export_stats_file(struct seq_file *m)
750{
751 /*
752 * The export_stats file uses the same ops as the exports file.
753 * We use the file's name to determine the reported info per export.
754 * There is no rename in nsfdfs, so d_name.name is stable.
755 */
756 return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats");
757}
758
759static int svc_export_show(struct seq_file *m,
760 struct cache_detail *cd,
761 struct cache_head *h)
762{
763 struct svc_export *exp;
764 bool export_stats = is_export_stats_file(m);
765
766 if (h == NULL) {
767 if (export_stats)
768 seq_puts(m, "#path domain start-time\n#\tstats\n");
769 else
770 seq_puts(m, "#path domain(flags)\n");
771 return 0;
772 }
773 exp = container_of(h, struct svc_export, h);
774 seq_path(m, &exp->ex_path, " \t\n\\");
775 seq_putc(m, '\t');
776 seq_escape(m, exp->ex_client->name, " \t\n\\");
777 if (export_stats) {
778 struct percpu_counter *counter = exp->ex_stats->counter;
779
780 seq_printf(m, "\t%lld\n", exp->ex_stats->start_time);
781 seq_printf(m, "\tfh_stale: %lld\n",
782 percpu_counter_sum_positive(&counter[EXP_STATS_FH_STALE]));
783 seq_printf(m, "\tio_read: %lld\n",
784 percpu_counter_sum_positive(&counter[EXP_STATS_IO_READ]));
785 seq_printf(m, "\tio_write: %lld\n",
786 percpu_counter_sum_positive(&counter[EXP_STATS_IO_WRITE]));
787 seq_putc(m, '\n');
788 return 0;
789 }
790 seq_putc(m, '(');
791 if (test_bit(CACHE_VALID, &h->flags) &&
792 !test_bit(CACHE_NEGATIVE, &h->flags)) {
793 exp_flags(m, exp->ex_flags, exp->ex_fsid,
794 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
795 if (exp->ex_uuid) {
796 int i;
797 seq_puts(m, ",uuid=");
798 for (i = 0; i < EX_UUID_LEN; i++) {
799 if ((i&3) == 0 && i)
800 seq_putc(m, ':');
801 seq_printf(m, "%02x", exp->ex_uuid[i]);
802 }
803 }
804 show_secinfo(m, exp);
805 }
806 seq_puts(m, ")\n");
807 return 0;
808}
809static int svc_export_match(struct cache_head *a, struct cache_head *b)
810{
811 struct svc_export *orig = container_of(a, struct svc_export, h);
812 struct svc_export *new = container_of(b, struct svc_export, h);
813 return orig->ex_client == new->ex_client &&
814 path_equal(&orig->ex_path, &new->ex_path);
815}
816
817static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
818{
819 struct svc_export *new = container_of(cnew, struct svc_export, h);
820 struct svc_export *item = container_of(citem, struct svc_export, h);
821
822 kref_get(&item->ex_client->ref);
823 new->ex_client = item->ex_client;
824 new->ex_path = item->ex_path;
825 path_get(&item->ex_path);
826 new->ex_fslocs.locations = NULL;
827 new->ex_fslocs.locations_count = 0;
828 new->ex_fslocs.migrated = 0;
829 new->ex_layout_types = 0;
830 new->ex_uuid = NULL;
831 new->cd = item->cd;
832 export_stats_reset(new->ex_stats);
833}
834
835static void export_update(struct cache_head *cnew, struct cache_head *citem)
836{
837 struct svc_export *new = container_of(cnew, struct svc_export, h);
838 struct svc_export *item = container_of(citem, struct svc_export, h);
839 int i;
840
841 new->ex_flags = item->ex_flags;
842 new->ex_anon_uid = item->ex_anon_uid;
843 new->ex_anon_gid = item->ex_anon_gid;
844 new->ex_fsid = item->ex_fsid;
845 new->ex_devid_map = item->ex_devid_map;
846 item->ex_devid_map = NULL;
847 new->ex_uuid = item->ex_uuid;
848 item->ex_uuid = NULL;
849 new->ex_fslocs.locations = item->ex_fslocs.locations;
850 item->ex_fslocs.locations = NULL;
851 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
852 item->ex_fslocs.locations_count = 0;
853 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
854 item->ex_fslocs.migrated = 0;
855 new->ex_layout_types = item->ex_layout_types;
856 new->ex_nflavors = item->ex_nflavors;
857 for (i = 0; i < MAX_SECINFO_LIST; i++) {
858 new->ex_flavors[i] = item->ex_flavors[i];
859 }
860 new->ex_xprtsec_modes = item->ex_xprtsec_modes;
861}
862
863static struct cache_head *svc_export_alloc(void)
864{
865 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
866 if (!i)
867 return NULL;
868
869 i->ex_stats = kmalloc(sizeof(*(i->ex_stats)), GFP_KERNEL);
870 if (!i->ex_stats) {
871 kfree(i);
872 return NULL;
873 }
874
875 if (export_stats_init(i->ex_stats)) {
876 kfree(i->ex_stats);
877 kfree(i);
878 return NULL;
879 }
880
881 return &i->h;
882}
883
884static const struct cache_detail svc_export_cache_template = {
885 .owner = THIS_MODULE,
886 .hash_size = EXPORT_HASHMAX,
887 .name = "nfsd.export",
888 .cache_put = svc_export_put,
889 .cache_upcall = svc_export_upcall,
890 .cache_request = svc_export_request,
891 .cache_parse = svc_export_parse,
892 .cache_show = svc_export_show,
893 .match = svc_export_match,
894 .init = svc_export_init,
895 .update = export_update,
896 .alloc = svc_export_alloc,
897};
898
899static int
900svc_export_hash(struct svc_export *exp)
901{
902 int hash;
903
904 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
905 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
906 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
907 return hash;
908}
909
910static struct svc_export *
911svc_export_lookup(struct svc_export *exp)
912{
913 struct cache_head *ch;
914 int hash = svc_export_hash(exp);
915
916 ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
917 if (ch)
918 return container_of(ch, struct svc_export, h);
919 else
920 return NULL;
921}
922
923static struct svc_export *
924svc_export_update(struct svc_export *new, struct svc_export *old)
925{
926 struct cache_head *ch;
927 int hash = svc_export_hash(old);
928
929 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
930 if (ch)
931 return container_of(ch, struct svc_export, h);
932 else
933 return NULL;
934}
935
936
937static struct svc_expkey *
938exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
939 u32 *fsidv, struct cache_req *reqp)
940{
941 struct svc_expkey key, *ek;
942 int err;
943
944 if (!clp)
945 return ERR_PTR(-ENOENT);
946
947 key.ek_client = clp;
948 key.ek_fsidtype = fsid_type;
949 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
950
951 ek = svc_expkey_lookup(cd, &key);
952 if (ek == NULL)
953 return ERR_PTR(-ENOMEM);
954 err = cache_check(cd, &ek->h, reqp);
955 if (err) {
956 trace_nfsd_exp_find_key(&key, err);
957 return ERR_PTR(err);
958 }
959 return ek;
960}
961
962static struct svc_export *
963exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
964 const struct path *path, struct cache_req *reqp)
965{
966 struct svc_export *exp, key;
967 int err;
968
969 if (!clp)
970 return ERR_PTR(-ENOENT);
971
972 key.ex_client = clp;
973 key.ex_path = *path;
974 key.cd = cd;
975
976 exp = svc_export_lookup(&key);
977 if (exp == NULL)
978 return ERR_PTR(-ENOMEM);
979 err = cache_check(cd, &exp->h, reqp);
980 if (err) {
981 trace_nfsd_exp_get_by_name(&key, err);
982 return ERR_PTR(err);
983 }
984 return exp;
985}
986
987/*
988 * Find the export entry for a given dentry.
989 */
990static struct svc_export *
991exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
992{
993 struct dentry *saved = dget(path->dentry);
994 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
995
996 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
997 struct dentry *parent = dget_parent(path->dentry);
998 dput(path->dentry);
999 path->dentry = parent;
1000 exp = exp_get_by_name(cd, clp, path, NULL);
1001 }
1002 dput(path->dentry);
1003 path->dentry = saved;
1004 return exp;
1005}
1006
1007
1008
1009/*
1010 * Obtain the root fh on behalf of a client.
1011 * This could be done in user space, but I feel that it adds some safety
1012 * since its harder to fool a kernel module than a user space program.
1013 */
1014int
1015exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
1016 struct knfsd_fh *f, int maxsize)
1017{
1018 struct svc_export *exp;
1019 struct path path;
1020 struct inode *inode;
1021 struct svc_fh fh;
1022 int err;
1023 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1024 struct cache_detail *cd = nn->svc_export_cache;
1025
1026 err = -EPERM;
1027 /* NB: we probably ought to check that it's NUL-terminated */
1028 if (kern_path(name, 0, &path)) {
1029 printk("nfsd: exp_rootfh path not found %s", name);
1030 return err;
1031 }
1032 inode = d_inode(path.dentry);
1033
1034 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1035 name, path.dentry, clp->name,
1036 inode->i_sb->s_id, inode->i_ino);
1037 exp = exp_parent(cd, clp, &path);
1038 if (IS_ERR(exp)) {
1039 err = PTR_ERR(exp);
1040 goto out;
1041 }
1042
1043 /*
1044 * fh must be initialized before calling fh_compose
1045 */
1046 fh_init(&fh, maxsize);
1047 if (fh_compose(&fh, exp, path.dentry, NULL))
1048 err = -EINVAL;
1049 else
1050 err = 0;
1051 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1052 fh_put(&fh);
1053 exp_put(exp);
1054out:
1055 path_put(&path);
1056 return err;
1057}
1058
1059static struct svc_export *exp_find(struct cache_detail *cd,
1060 struct auth_domain *clp, int fsid_type,
1061 u32 *fsidv, struct cache_req *reqp)
1062{
1063 struct svc_export *exp;
1064 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
1065 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1066 if (IS_ERR(ek))
1067 return ERR_CAST(ek);
1068
1069 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
1070 cache_put(&ek->h, nn->svc_expkey_cache);
1071
1072 if (IS_ERR(exp))
1073 return ERR_CAST(exp);
1074 return exp;
1075}
1076
1077/**
1078 * check_nfsd_access - check if access to export is allowed.
1079 * @exp: svc_export that is being accessed.
1080 * @rqstp: svc_rqst attempting to access @exp (will be NULL for LOCALIO).
1081 * @may_bypass_gss: reduce strictness of authorization check
1082 *
1083 * Return values:
1084 * %nfs_ok if access is granted, or
1085 * %nfserr_wrongsec if access is denied
1086 */
1087__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp,
1088 bool may_bypass_gss)
1089{
1090 struct exp_flavor_info *f, *end = exp->ex_flavors + exp->ex_nflavors;
1091 struct svc_xprt *xprt;
1092
1093 /*
1094 * If rqstp is NULL, this is a LOCALIO request which will only
1095 * ever use a filehandle/credential pair for which access has
1096 * been affirmed (by ACCESS or OPEN NFS requests) over the
1097 * wire. So there is no need for further checks here.
1098 */
1099 if (!rqstp)
1100 return nfs_ok;
1101
1102 xprt = rqstp->rq_xprt;
1103
1104 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) {
1105 if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags))
1106 goto ok;
1107 }
1108 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) {
1109 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1110 !test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1111 goto ok;
1112 }
1113 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) {
1114 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1115 test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1116 goto ok;
1117 }
1118 goto denied;
1119
1120ok:
1121 /* legacy gss-only clients are always OK: */
1122 if (exp->ex_client == rqstp->rq_gssclient)
1123 return nfs_ok;
1124 /* ip-address based client; check sec= export option: */
1125 for (f = exp->ex_flavors; f < end; f++) {
1126 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
1127 return nfs_ok;
1128 }
1129 /* defaults in absence of sec= options: */
1130 if (exp->ex_nflavors == 0) {
1131 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1132 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
1133 return nfs_ok;
1134 }
1135
1136 /* If the compound op contains a spo_must_allowed op,
1137 * it will be sent with integrity/protection which
1138 * will have to be expressly allowed on mounts that
1139 * don't support it
1140 */
1141
1142 if (nfsd4_spo_must_allow(rqstp))
1143 return nfs_ok;
1144
1145 /* Some calls may be processed without authentication
1146 * on GSS exports. For example NFS2/3 calls on root
1147 * directory, see section 2.3.2 of rfc 2623.
1148 * For "may_bypass_gss" check that export has really
1149 * enabled some flavor with authentication (GSS or any
1150 * other) and also check that the used auth flavor is
1151 * without authentication (none or sys).
1152 */
1153 if (may_bypass_gss && (
1154 rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1155 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)) {
1156 for (f = exp->ex_flavors; f < end; f++) {
1157 if (f->pseudoflavor >= RPC_AUTH_DES)
1158 return 0;
1159 }
1160 }
1161
1162denied:
1163 return nfserr_wrongsec;
1164}
1165
1166/*
1167 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1168 * auth_unix client) if it's available and has secinfo information;
1169 * otherwise, will try to use rq_gssclient.
1170 *
1171 * Called from functions that handle requests; functions that do work on
1172 * behalf of mountd are passed a single client name to use, and should
1173 * use exp_get_by_name() or exp_find().
1174 */
1175struct svc_export *
1176rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1177{
1178 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1179 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1180 struct cache_detail *cd = nn->svc_export_cache;
1181
1182 if (rqstp->rq_client == NULL)
1183 goto gss;
1184
1185 /* First try the auth_unix client: */
1186 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
1187 if (PTR_ERR(exp) == -ENOENT)
1188 goto gss;
1189 if (IS_ERR(exp))
1190 return exp;
1191 /* If it has secinfo, assume there are no gss/... clients */
1192 if (exp->ex_nflavors > 0)
1193 return exp;
1194gss:
1195 /* Otherwise, try falling back on gss client */
1196 if (rqstp->rq_gssclient == NULL)
1197 return exp;
1198 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1199 if (PTR_ERR(gssexp) == -ENOENT)
1200 return exp;
1201 if (!IS_ERR(exp))
1202 exp_put(exp);
1203 return gssexp;
1204}
1205
1206/**
1207 * rqst_exp_find - Find an svc_export in the context of a rqst or similar
1208 * @reqp: The handle to be used to suspend the request if a cache-upcall is needed
1209 * If NULL, missing in-cache information will result in failure.
1210 * @net: The network namespace in which the request exists
1211 * @cl: default auth_domain to use for looking up the export
1212 * @gsscl: an alternate auth_domain defined using deprecated gss/krb5 format.
1213 * @fsid_type: The type of fsid to look for
1214 * @fsidv: The actual fsid to look up in the context of either client.
1215 *
1216 * Perform a lookup for @cl/@fsidv in the given @net for an export. If
1217 * none found and @gsscl specified, repeat the lookup.
1218 *
1219 * Returns an export, or an error pointer.
1220 */
1221struct svc_export *
1222rqst_exp_find(struct cache_req *reqp, struct net *net,
1223 struct auth_domain *cl, struct auth_domain *gsscl,
1224 int fsid_type, u32 *fsidv)
1225{
1226 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1227 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1228 struct cache_detail *cd = nn->svc_export_cache;
1229
1230 if (!cl)
1231 goto gss;
1232
1233 /* First try the auth_unix client: */
1234 exp = exp_find(cd, cl, fsid_type, fsidv, reqp);
1235 if (PTR_ERR(exp) == -ENOENT)
1236 goto gss;
1237 if (IS_ERR(exp))
1238 return exp;
1239 /* If it has secinfo, assume there are no gss/... clients */
1240 if (exp->ex_nflavors > 0)
1241 return exp;
1242gss:
1243 /* Otherwise, try falling back on gss client */
1244 if (!gsscl)
1245 return exp;
1246 gssexp = exp_find(cd, gsscl, fsid_type, fsidv, reqp);
1247 if (PTR_ERR(gssexp) == -ENOENT)
1248 return exp;
1249 if (!IS_ERR(exp))
1250 exp_put(exp);
1251 return gssexp;
1252}
1253
1254struct svc_export *
1255rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1256{
1257 struct dentry *saved = dget(path->dentry);
1258 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1259
1260 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1261 struct dentry *parent = dget_parent(path->dentry);
1262 dput(path->dentry);
1263 path->dentry = parent;
1264 exp = rqst_exp_get_by_name(rqstp, path);
1265 }
1266 dput(path->dentry);
1267 path->dentry = saved;
1268 return exp;
1269}
1270
1271struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1272{
1273 u32 fsidv[2];
1274
1275 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1276
1277 return rqst_exp_find(&rqstp->rq_chandle, SVC_NET(rqstp),
1278 rqstp->rq_client, rqstp->rq_gssclient,
1279 FSID_NUM, fsidv);
1280}
1281
1282/*
1283 * Called when we need the filehandle for the root of the pseudofs,
1284 * for a given NFSv4 client. The root is defined to be the
1285 * export point with fsid==0
1286 */
1287__be32
1288exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1289{
1290 struct svc_export *exp;
1291 __be32 rv;
1292
1293 exp = rqst_find_fsidzero_export(rqstp);
1294 if (IS_ERR(exp))
1295 return nfserrno(PTR_ERR(exp));
1296 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1297 exp_put(exp);
1298 return rv;
1299}
1300
1301static struct flags {
1302 int flag;
1303 char *name[2];
1304} expflags[] = {
1305 { NFSEXP_READONLY, {"ro", "rw"}},
1306 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1307 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1308 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1309 { NFSEXP_ASYNC, {"async", "sync"}},
1310 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1311 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1312 { NFSEXP_NOHIDE, {"nohide", ""}},
1313 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1314 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1315 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1316 { NFSEXP_V4ROOT, {"v4root", ""}},
1317 { NFSEXP_PNFS, {"pnfs", ""}},
1318 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1319 { 0, {"", ""}}
1320};
1321
1322static void show_expflags(struct seq_file *m, int flags, int mask)
1323{
1324 struct flags *flg;
1325 int state, first = 0;
1326
1327 for (flg = expflags; flg->flag; flg++) {
1328 if (flg->flag & ~mask)
1329 continue;
1330 state = (flg->flag & flags) ? 0 : 1;
1331 if (*flg->name[state])
1332 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1333 }
1334}
1335
1336static void show_secinfo_flags(struct seq_file *m, int flags)
1337{
1338 seq_printf(m, ",");
1339 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1340}
1341
1342static bool secinfo_flags_equal(int f, int g)
1343{
1344 f &= NFSEXP_SECINFO_FLAGS;
1345 g &= NFSEXP_SECINFO_FLAGS;
1346 return f == g;
1347}
1348
1349static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1350{
1351 int flags;
1352
1353 flags = (*fp)->flags;
1354 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1355 (*fp)++;
1356 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1357 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1358 (*fp)++;
1359 }
1360 return flags;
1361}
1362
1363static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1364{
1365 struct exp_flavor_info *f;
1366 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1367 int flags;
1368
1369 if (exp->ex_nflavors == 0)
1370 return;
1371 f = exp->ex_flavors;
1372 flags = show_secinfo_run(m, &f, end);
1373 if (!secinfo_flags_equal(flags, exp->ex_flags))
1374 show_secinfo_flags(m, flags);
1375 while (f != end) {
1376 flags = show_secinfo_run(m, &f, end);
1377 show_secinfo_flags(m, flags);
1378 }
1379}
1380
1381static void exp_flags(struct seq_file *m, int flag, int fsid,
1382 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1383{
1384 struct user_namespace *userns = m->file->f_cred->user_ns;
1385
1386 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1387 if (flag & NFSEXP_FSID)
1388 seq_printf(m, ",fsid=%d", fsid);
1389 if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
1390 !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
1391 seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
1392 if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
1393 !gid_eq(anong, make_kgid(userns, 0x10000-2)))
1394 seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
1395 if (fsloc && fsloc->locations_count > 0) {
1396 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1397 int i;
1398
1399 seq_printf(m, ",%s=", loctype);
1400 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1401 seq_putc(m, '@');
1402 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1403 for (i = 1; i < fsloc->locations_count; i++) {
1404 seq_putc(m, ';');
1405 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1406 seq_putc(m, '@');
1407 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1408 }
1409 }
1410}
1411
1412static int e_show(struct seq_file *m, void *p)
1413{
1414 struct cache_head *cp = p;
1415 struct svc_export *exp = container_of(cp, struct svc_export, h);
1416 struct cache_detail *cd = m->private;
1417 bool export_stats = is_export_stats_file(m);
1418
1419 if (p == SEQ_START_TOKEN) {
1420 seq_puts(m, "# Version 1.1\n");
1421 if (export_stats)
1422 seq_puts(m, "# Path Client Start-time\n#\tStats\n");
1423 else
1424 seq_puts(m, "# Path Client(Flags) # IPs\n");
1425 return 0;
1426 }
1427
1428 if (!cache_get_rcu(&exp->h))
1429 return 0;
1430
1431 if (cache_check(cd, &exp->h, NULL))
1432 return 0;
1433
1434 exp_put(exp);
1435 return svc_export_show(m, cd, cp);
1436}
1437
1438const struct seq_operations nfs_exports_op = {
1439 .start = cache_seq_start_rcu,
1440 .next = cache_seq_next_rcu,
1441 .stop = cache_seq_stop_rcu,
1442 .show = e_show,
1443};
1444
1445/*
1446 * Initialize the exports module.
1447 */
1448int
1449nfsd_export_init(struct net *net)
1450{
1451 int rv;
1452 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1453
1454 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1455
1456 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1457 if (IS_ERR(nn->svc_export_cache))
1458 return PTR_ERR(nn->svc_export_cache);
1459 rv = cache_register_net(nn->svc_export_cache, net);
1460 if (rv)
1461 goto destroy_export_cache;
1462
1463 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1464 if (IS_ERR(nn->svc_expkey_cache)) {
1465 rv = PTR_ERR(nn->svc_expkey_cache);
1466 goto unregister_export_cache;
1467 }
1468 rv = cache_register_net(nn->svc_expkey_cache, net);
1469 if (rv)
1470 goto destroy_expkey_cache;
1471 return 0;
1472
1473destroy_expkey_cache:
1474 cache_destroy_net(nn->svc_expkey_cache, net);
1475unregister_export_cache:
1476 cache_unregister_net(nn->svc_export_cache, net);
1477destroy_export_cache:
1478 cache_destroy_net(nn->svc_export_cache, net);
1479 return rv;
1480}
1481
1482/*
1483 * Flush exports table - called when last nfsd thread is killed
1484 */
1485void
1486nfsd_export_flush(struct net *net)
1487{
1488 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1489
1490 cache_purge(nn->svc_expkey_cache);
1491 cache_purge(nn->svc_export_cache);
1492}
1493
1494/*
1495 * Shutdown the exports module.
1496 */
1497void
1498nfsd_export_shutdown(struct net *net)
1499{
1500 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1501
1502 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1503
1504 cache_unregister_net(nn->svc_expkey_cache, net);
1505 cache_unregister_net(nn->svc_export_cache, net);
1506 cache_destroy_net(nn->svc_expkey_cache, net);
1507 cache_destroy_net(nn->svc_export_cache, net);
1508 svcauth_unix_purge(net);
1509
1510 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1511}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NFS exporting and validation.
4 *
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
10 *
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
13 */
14
15#include <linux/slab.h>
16#include <linux/namei.h>
17#include <linux/module.h>
18#include <linux/exportfs.h>
19#include <linux/sunrpc/svc_xprt.h>
20
21#include "nfsd.h"
22#include "nfsfh.h"
23#include "netns.h"
24#include "pnfs.h"
25#include "filecache.h"
26#include "trace.h"
27
28#define NFSDDBG_FACILITY NFSDDBG_EXPORT
29
30/*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39#define EXPKEY_HASHBITS 8
40#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42
43static void expkey_put(struct kref *ref)
44{
45 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
46
47 if (test_bit(CACHE_VALID, &key->h.flags) &&
48 !test_bit(CACHE_NEGATIVE, &key->h.flags))
49 path_put(&key->ek_path);
50 auth_domain_put(key->ek_client);
51 kfree_rcu(key, ek_rcu);
52}
53
54static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
55{
56 return sunrpc_cache_pipe_upcall(cd, h);
57}
58
59static void expkey_request(struct cache_detail *cd,
60 struct cache_head *h,
61 char **bpp, int *blen)
62{
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
71 (*bpp)[-1] = '\n';
72}
73
74static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
75 struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
77
78static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
79{
80 /* client fsidtype fsid expiry [path] */
81 char *buf;
82 int len;
83 struct auth_domain *dom = NULL;
84 int err;
85 int fsidtype;
86 char *ep;
87 struct svc_expkey key;
88 struct svc_expkey *ek = NULL;
89
90 if (mesg[mlen - 1] != '\n')
91 return -EINVAL;
92 mesg[mlen-1] = 0;
93
94 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 err = -ENOMEM;
96 if (!buf)
97 goto out;
98
99 err = -EINVAL;
100 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
111 goto out;
112 fsidtype = simple_strtoul(buf, &ep, 10);
113 if (*ep)
114 goto out;
115 dprintk("found fsidtype %d\n", fsidtype);
116 if (key_len(fsidtype)==0) /* invalid type */
117 goto out;
118 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
119 goto out;
120 dprintk("found fsid length %d\n", len);
121 if (len != key_len(fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 err = get_expiry(&mesg, &key.h.expiry_time);
127 if (err)
128 goto out;
129
130 key.ek_client = dom;
131 key.ek_fsidtype = fsidtype;
132 memcpy(key.ek_fsid, buf, len);
133
134 ek = svc_expkey_lookup(cd, &key);
135 err = -ENOMEM;
136 if (!ek)
137 goto out;
138
139 /* now we want a pathname, or empty meaning NEGATIVE */
140 err = -EINVAL;
141 len = qword_get(&mesg, buf, PAGE_SIZE);
142 if (len < 0)
143 goto out;
144 dprintk("Path seems to be <%s>\n", buf);
145 err = 0;
146 if (len == 0) {
147 set_bit(CACHE_NEGATIVE, &key.h.flags);
148 ek = svc_expkey_update(cd, &key, ek);
149 if (ek)
150 trace_nfsd_expkey_update(ek, NULL);
151 else
152 err = -ENOMEM;
153 } else {
154 err = kern_path(buf, 0, &key.ek_path);
155 if (err)
156 goto out;
157
158 dprintk("Found the path %s\n", buf);
159
160 ek = svc_expkey_update(cd, &key, ek);
161 if (ek)
162 trace_nfsd_expkey_update(ek, buf);
163 else
164 err = -ENOMEM;
165 path_put(&key.ek_path);
166 }
167 cache_flush();
168 out:
169 if (ek)
170 cache_put(&ek->h, cd);
171 if (dom)
172 auth_domain_put(dom);
173 kfree(buf);
174 return err;
175}
176
177static int expkey_show(struct seq_file *m,
178 struct cache_detail *cd,
179 struct cache_head *h)
180{
181 struct svc_expkey *ek ;
182 int i;
183
184 if (h ==NULL) {
185 seq_puts(m, "#domain fsidtype fsid [path]\n");
186 return 0;
187 }
188 ek = container_of(h, struct svc_expkey, h);
189 seq_printf(m, "%s %d 0x", ek->ek_client->name,
190 ek->ek_fsidtype);
191 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
192 seq_printf(m, "%08x", ek->ek_fsid[i]);
193 if (test_bit(CACHE_VALID, &h->flags) &&
194 !test_bit(CACHE_NEGATIVE, &h->flags)) {
195 seq_printf(m, " ");
196 seq_path(m, &ek->ek_path, "\\ \t\n");
197 }
198 seq_printf(m, "\n");
199 return 0;
200}
201
202static inline int expkey_match (struct cache_head *a, struct cache_head *b)
203{
204 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
205 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
206
207 if (orig->ek_fsidtype != new->ek_fsidtype ||
208 orig->ek_client != new->ek_client ||
209 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
210 return 0;
211 return 1;
212}
213
214static inline void expkey_init(struct cache_head *cnew,
215 struct cache_head *citem)
216{
217 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
218 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
219
220 kref_get(&item->ek_client->ref);
221 new->ek_client = item->ek_client;
222 new->ek_fsidtype = item->ek_fsidtype;
223
224 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
225}
226
227static inline void expkey_update(struct cache_head *cnew,
228 struct cache_head *citem)
229{
230 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
231 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
232
233 new->ek_path = item->ek_path;
234 path_get(&item->ek_path);
235}
236
237static struct cache_head *expkey_alloc(void)
238{
239 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
240 if (i)
241 return &i->h;
242 else
243 return NULL;
244}
245
246static void expkey_flush(void)
247{
248 /*
249 * Take the nfsd_mutex here to ensure that the file cache is not
250 * destroyed while we're in the middle of flushing.
251 */
252 mutex_lock(&nfsd_mutex);
253 nfsd_file_cache_purge(current->nsproxy->net_ns);
254 mutex_unlock(&nfsd_mutex);
255}
256
257static const struct cache_detail svc_expkey_cache_template = {
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_upcall = expkey_upcall,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
270 .flush = expkey_flush,
271};
272
273static int
274svc_expkey_hash(struct svc_expkey *item)
275{
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
283 return hash;
284}
285
286static struct svc_expkey *
287svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
288{
289 struct cache_head *ch;
290 int hash = svc_expkey_hash(item);
291
292 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297}
298
299static struct svc_expkey *
300svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
301 struct svc_expkey *old)
302{
303 struct cache_head *ch;
304 int hash = svc_expkey_hash(new);
305
306 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
307 if (ch)
308 return container_of(ch, struct svc_expkey, h);
309 else
310 return NULL;
311}
312
313
314#define EXPORT_HASHBITS 8
315#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
316
317static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
318{
319 struct nfsd4_fs_location *locations = fsloc->locations;
320 int i;
321
322 if (!locations)
323 return;
324
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(locations[i].path);
327 kfree(locations[i].hosts);
328 }
329
330 kfree(locations);
331 fsloc->locations = NULL;
332}
333
334static int export_stats_init(struct export_stats *stats)
335{
336 stats->start_time = ktime_get_seconds();
337 return nfsd_percpu_counters_init(stats->counter, EXP_STATS_COUNTERS_NUM);
338}
339
340static void export_stats_reset(struct export_stats *stats)
341{
342 if (stats)
343 nfsd_percpu_counters_reset(stats->counter,
344 EXP_STATS_COUNTERS_NUM);
345}
346
347static void export_stats_destroy(struct export_stats *stats)
348{
349 if (stats)
350 nfsd_percpu_counters_destroy(stats->counter,
351 EXP_STATS_COUNTERS_NUM);
352}
353
354static void svc_export_put(struct kref *ref)
355{
356 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
357 path_put(&exp->ex_path);
358 auth_domain_put(exp->ex_client);
359 nfsd4_fslocs_free(&exp->ex_fslocs);
360 export_stats_destroy(exp->ex_stats);
361 kfree(exp->ex_stats);
362 kfree(exp->ex_uuid);
363 kfree_rcu(exp, ex_rcu);
364}
365
366static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
367{
368 return sunrpc_cache_pipe_upcall(cd, h);
369}
370
371static void svc_export_request(struct cache_detail *cd,
372 struct cache_head *h,
373 char **bpp, int *blen)
374{
375 /* client path */
376 struct svc_export *exp = container_of(h, struct svc_export, h);
377 char *pth;
378
379 qword_add(bpp, blen, exp->ex_client->name);
380 pth = d_path(&exp->ex_path, *bpp, *blen);
381 if (IS_ERR(pth)) {
382 /* is this correct? */
383 (*bpp)[0] = '\n';
384 return;
385 }
386 qword_add(bpp, blen, pth);
387 (*bpp)[-1] = '\n';
388}
389
390static struct svc_export *svc_export_update(struct svc_export *new,
391 struct svc_export *old);
392static struct svc_export *svc_export_lookup(struct svc_export *);
393
394static int check_export(struct path *path, int *flags, unsigned char *uuid)
395{
396 struct inode *inode = d_inode(path->dentry);
397
398 /*
399 * We currently export only dirs, regular files, and (for v4
400 * pseudoroot) symlinks.
401 */
402 if (!S_ISDIR(inode->i_mode) &&
403 !S_ISLNK(inode->i_mode) &&
404 !S_ISREG(inode->i_mode))
405 return -ENOTDIR;
406
407 /*
408 * Mountd should never pass down a writeable V4ROOT export, but,
409 * just to make sure:
410 */
411 if (*flags & NFSEXP_V4ROOT)
412 *flags |= NFSEXP_READONLY;
413
414 /* There are two requirements on a filesystem to be exportable.
415 * 1: We must be able to identify the filesystem from a number.
416 * either a device number (so FS_REQUIRES_DEV needed)
417 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
418 * 2: We must be able to find an inode from a filehandle.
419 * This means that s_export_op must be set.
420 * 3: We must not currently be on an idmapped mount.
421 */
422 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
423 !(*flags & NFSEXP_FSID) &&
424 uuid == NULL) {
425 dprintk("exp_export: export of non-dev fs without fsid\n");
426 return -EINVAL;
427 }
428
429 if (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) {
430 dprintk("exp_export: export of invalid fs type.\n");
431 return -EINVAL;
432 }
433
434 if (is_idmapped_mnt(path->mnt)) {
435 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
436 return -EINVAL;
437 }
438
439 if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
440 !(*flags & NFSEXP_NOSUBTREECHECK)) {
441 dprintk("%s: %s does not support subtree checking!\n",
442 __func__, inode->i_sb->s_type->name);
443 return -EINVAL;
444 }
445 return 0;
446}
447
448#ifdef CONFIG_NFSD_V4
449
450static int
451fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
452{
453 int len;
454 int migrated, i, err;
455
456 /* more than one fsloc */
457 if (fsloc->locations)
458 return -EINVAL;
459
460 /* listsize */
461 err = get_uint(mesg, &fsloc->locations_count);
462 if (err)
463 return err;
464 if (fsloc->locations_count > MAX_FS_LOCATIONS)
465 return -EINVAL;
466 if (fsloc->locations_count == 0)
467 return 0;
468
469 fsloc->locations = kcalloc(fsloc->locations_count,
470 sizeof(struct nfsd4_fs_location),
471 GFP_KERNEL);
472 if (!fsloc->locations)
473 return -ENOMEM;
474 for (i=0; i < fsloc->locations_count; i++) {
475 /* colon separated host list */
476 err = -EINVAL;
477 len = qword_get(mesg, buf, PAGE_SIZE);
478 if (len <= 0)
479 goto out_free_all;
480 err = -ENOMEM;
481 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
482 if (!fsloc->locations[i].hosts)
483 goto out_free_all;
484 err = -EINVAL;
485 /* slash separated path component list */
486 len = qword_get(mesg, buf, PAGE_SIZE);
487 if (len <= 0)
488 goto out_free_all;
489 err = -ENOMEM;
490 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
491 if (!fsloc->locations[i].path)
492 goto out_free_all;
493 }
494 /* migrated */
495 err = get_int(mesg, &migrated);
496 if (err)
497 goto out_free_all;
498 err = -EINVAL;
499 if (migrated < 0 || migrated > 1)
500 goto out_free_all;
501 fsloc->migrated = migrated;
502 return 0;
503out_free_all:
504 nfsd4_fslocs_free(fsloc);
505 return err;
506}
507
508static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
509{
510 struct exp_flavor_info *f;
511 u32 listsize;
512 int err;
513
514 /* more than one secinfo */
515 if (exp->ex_nflavors)
516 return -EINVAL;
517
518 err = get_uint(mesg, &listsize);
519 if (err)
520 return err;
521 if (listsize > MAX_SECINFO_LIST)
522 return -EINVAL;
523
524 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
525 err = get_uint(mesg, &f->pseudoflavor);
526 if (err)
527 return err;
528 /*
529 * XXX: It would be nice to also check whether this
530 * pseudoflavor is supported, so we can discover the
531 * problem at export time instead of when a client fails
532 * to authenticate.
533 */
534 err = get_uint(mesg, &f->flags);
535 if (err)
536 return err;
537 /* Only some flags are allowed to differ between flavors: */
538 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
539 return -EINVAL;
540 }
541 exp->ex_nflavors = listsize;
542 return 0;
543}
544
545#else /* CONFIG_NFSD_V4 */
546static inline int
547fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
548static inline int
549secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
550#endif
551
552static int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp)
553{
554 unsigned int i, mode, listsize;
555 int err;
556
557 err = get_uint(mesg, &listsize);
558 if (err)
559 return err;
560 if (listsize > NFSEXP_XPRTSEC_NUM)
561 return -EINVAL;
562
563 exp->ex_xprtsec_modes = 0;
564 for (i = 0; i < listsize; i++) {
565 err = get_uint(mesg, &mode);
566 if (err)
567 return err;
568 if (mode > NFSEXP_XPRTSEC_MTLS)
569 return -EINVAL;
570 exp->ex_xprtsec_modes |= mode;
571 }
572 return 0;
573}
574
575static inline int
576nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
577{
578 int len;
579
580 /* more than one uuid */
581 if (*puuid)
582 return -EINVAL;
583
584 /* expect a 16 byte uuid encoded as \xXXXX... */
585 len = qword_get(mesg, buf, PAGE_SIZE);
586 if (len != EX_UUID_LEN)
587 return -EINVAL;
588
589 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
590 if (*puuid == NULL)
591 return -ENOMEM;
592
593 return 0;
594}
595
596static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
597{
598 /* client path expiry [flags anonuid anongid fsid] */
599 char *buf;
600 int err;
601 struct auth_domain *dom = NULL;
602 struct svc_export exp = {}, *expp;
603 int an_int;
604
605 if (mesg[mlen-1] != '\n')
606 return -EINVAL;
607 mesg[mlen-1] = 0;
608
609 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
610 if (!buf)
611 return -ENOMEM;
612
613 /* client */
614 err = -EINVAL;
615 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
616 goto out;
617
618 err = -ENOENT;
619 dom = auth_domain_find(buf);
620 if (!dom)
621 goto out;
622
623 /* path */
624 err = -EINVAL;
625 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
626 goto out1;
627
628 err = kern_path(buf, 0, &exp.ex_path);
629 if (err)
630 goto out1;
631
632 exp.ex_client = dom;
633 exp.cd = cd;
634 exp.ex_devid_map = NULL;
635 exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL;
636
637 /* expiry */
638 err = get_expiry(&mesg, &exp.h.expiry_time);
639 if (err)
640 goto out3;
641
642 /* flags */
643 err = get_int(&mesg, &an_int);
644 if (err == -ENOENT) {
645 err = 0;
646 set_bit(CACHE_NEGATIVE, &exp.h.flags);
647 } else {
648 if (err || an_int < 0)
649 goto out3;
650 exp.ex_flags= an_int;
651
652 /* anon uid */
653 err = get_int(&mesg, &an_int);
654 if (err)
655 goto out3;
656 exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
657
658 /* anon gid */
659 err = get_int(&mesg, &an_int);
660 if (err)
661 goto out3;
662 exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
663
664 /* fsid */
665 err = get_int(&mesg, &an_int);
666 if (err)
667 goto out3;
668 exp.ex_fsid = an_int;
669
670 while (qword_get(&mesg, buf, PAGE_SIZE) > 0) {
671 if (strcmp(buf, "fsloc") == 0)
672 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
673 else if (strcmp(buf, "uuid") == 0)
674 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
675 else if (strcmp(buf, "secinfo") == 0)
676 err = secinfo_parse(&mesg, buf, &exp);
677 else if (strcmp(buf, "xprtsec") == 0)
678 err = xprtsec_parse(&mesg, buf, &exp);
679 else
680 /* quietly ignore unknown words and anything
681 * following. Newer user-space can try to set
682 * new values, then see what the result was.
683 */
684 break;
685 if (err)
686 goto out4;
687 }
688
689 err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
690 if (err)
691 goto out4;
692
693 /*
694 * No point caching this if it would immediately expire.
695 * Also, this protects exportfs's dummy export from the
696 * anon_uid/anon_gid checks:
697 */
698 if (exp.h.expiry_time < seconds_since_boot())
699 goto out4;
700 /*
701 * For some reason exportfs has been passing down an
702 * invalid (-1) uid & gid on the "dummy" export which it
703 * uses to test export support. To make sure exportfs
704 * sees errors from check_export we therefore need to
705 * delay these checks till after check_export:
706 */
707 err = -EINVAL;
708 if (!uid_valid(exp.ex_anon_uid))
709 goto out4;
710 if (!gid_valid(exp.ex_anon_gid))
711 goto out4;
712 err = 0;
713
714 nfsd4_setup_layout_type(&exp);
715 }
716
717 expp = svc_export_lookup(&exp);
718 if (!expp) {
719 err = -ENOMEM;
720 goto out4;
721 }
722 expp = svc_export_update(&exp, expp);
723 if (expp) {
724 trace_nfsd_export_update(expp);
725 cache_flush();
726 exp_put(expp);
727 } else
728 err = -ENOMEM;
729out4:
730 nfsd4_fslocs_free(&exp.ex_fslocs);
731 kfree(exp.ex_uuid);
732out3:
733 path_put(&exp.ex_path);
734out1:
735 auth_domain_put(dom);
736out:
737 kfree(buf);
738 return err;
739}
740
741static void exp_flags(struct seq_file *m, int flag, int fsid,
742 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
743static void show_secinfo(struct seq_file *m, struct svc_export *exp);
744
745static int is_export_stats_file(struct seq_file *m)
746{
747 /*
748 * The export_stats file uses the same ops as the exports file.
749 * We use the file's name to determine the reported info per export.
750 * There is no rename in nsfdfs, so d_name.name is stable.
751 */
752 return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats");
753}
754
755static int svc_export_show(struct seq_file *m,
756 struct cache_detail *cd,
757 struct cache_head *h)
758{
759 struct svc_export *exp;
760 bool export_stats = is_export_stats_file(m);
761
762 if (h == NULL) {
763 if (export_stats)
764 seq_puts(m, "#path domain start-time\n#\tstats\n");
765 else
766 seq_puts(m, "#path domain(flags)\n");
767 return 0;
768 }
769 exp = container_of(h, struct svc_export, h);
770 seq_path(m, &exp->ex_path, " \t\n\\");
771 seq_putc(m, '\t');
772 seq_escape(m, exp->ex_client->name, " \t\n\\");
773 if (export_stats) {
774 struct percpu_counter *counter = exp->ex_stats->counter;
775
776 seq_printf(m, "\t%lld\n", exp->ex_stats->start_time);
777 seq_printf(m, "\tfh_stale: %lld\n",
778 percpu_counter_sum_positive(&counter[EXP_STATS_FH_STALE]));
779 seq_printf(m, "\tio_read: %lld\n",
780 percpu_counter_sum_positive(&counter[EXP_STATS_IO_READ]));
781 seq_printf(m, "\tio_write: %lld\n",
782 percpu_counter_sum_positive(&counter[EXP_STATS_IO_WRITE]));
783 seq_putc(m, '\n');
784 return 0;
785 }
786 seq_putc(m, '(');
787 if (test_bit(CACHE_VALID, &h->flags) &&
788 !test_bit(CACHE_NEGATIVE, &h->flags)) {
789 exp_flags(m, exp->ex_flags, exp->ex_fsid,
790 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
791 if (exp->ex_uuid) {
792 int i;
793 seq_puts(m, ",uuid=");
794 for (i = 0; i < EX_UUID_LEN; i++) {
795 if ((i&3) == 0 && i)
796 seq_putc(m, ':');
797 seq_printf(m, "%02x", exp->ex_uuid[i]);
798 }
799 }
800 show_secinfo(m, exp);
801 }
802 seq_puts(m, ")\n");
803 return 0;
804}
805static int svc_export_match(struct cache_head *a, struct cache_head *b)
806{
807 struct svc_export *orig = container_of(a, struct svc_export, h);
808 struct svc_export *new = container_of(b, struct svc_export, h);
809 return orig->ex_client == new->ex_client &&
810 path_equal(&orig->ex_path, &new->ex_path);
811}
812
813static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
814{
815 struct svc_export *new = container_of(cnew, struct svc_export, h);
816 struct svc_export *item = container_of(citem, struct svc_export, h);
817
818 kref_get(&item->ex_client->ref);
819 new->ex_client = item->ex_client;
820 new->ex_path = item->ex_path;
821 path_get(&item->ex_path);
822 new->ex_fslocs.locations = NULL;
823 new->ex_fslocs.locations_count = 0;
824 new->ex_fslocs.migrated = 0;
825 new->ex_layout_types = 0;
826 new->ex_uuid = NULL;
827 new->cd = item->cd;
828 export_stats_reset(new->ex_stats);
829}
830
831static void export_update(struct cache_head *cnew, struct cache_head *citem)
832{
833 struct svc_export *new = container_of(cnew, struct svc_export, h);
834 struct svc_export *item = container_of(citem, struct svc_export, h);
835 int i;
836
837 new->ex_flags = item->ex_flags;
838 new->ex_anon_uid = item->ex_anon_uid;
839 new->ex_anon_gid = item->ex_anon_gid;
840 new->ex_fsid = item->ex_fsid;
841 new->ex_devid_map = item->ex_devid_map;
842 item->ex_devid_map = NULL;
843 new->ex_uuid = item->ex_uuid;
844 item->ex_uuid = NULL;
845 new->ex_fslocs.locations = item->ex_fslocs.locations;
846 item->ex_fslocs.locations = NULL;
847 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
848 item->ex_fslocs.locations_count = 0;
849 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
850 item->ex_fslocs.migrated = 0;
851 new->ex_layout_types = item->ex_layout_types;
852 new->ex_nflavors = item->ex_nflavors;
853 for (i = 0; i < MAX_SECINFO_LIST; i++) {
854 new->ex_flavors[i] = item->ex_flavors[i];
855 }
856 new->ex_xprtsec_modes = item->ex_xprtsec_modes;
857}
858
859static struct cache_head *svc_export_alloc(void)
860{
861 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
862 if (!i)
863 return NULL;
864
865 i->ex_stats = kmalloc(sizeof(*(i->ex_stats)), GFP_KERNEL);
866 if (!i->ex_stats) {
867 kfree(i);
868 return NULL;
869 }
870
871 if (export_stats_init(i->ex_stats)) {
872 kfree(i->ex_stats);
873 kfree(i);
874 return NULL;
875 }
876
877 return &i->h;
878}
879
880static const struct cache_detail svc_export_cache_template = {
881 .owner = THIS_MODULE,
882 .hash_size = EXPORT_HASHMAX,
883 .name = "nfsd.export",
884 .cache_put = svc_export_put,
885 .cache_upcall = svc_export_upcall,
886 .cache_request = svc_export_request,
887 .cache_parse = svc_export_parse,
888 .cache_show = svc_export_show,
889 .match = svc_export_match,
890 .init = svc_export_init,
891 .update = export_update,
892 .alloc = svc_export_alloc,
893};
894
895static int
896svc_export_hash(struct svc_export *exp)
897{
898 int hash;
899
900 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
901 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
902 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
903 return hash;
904}
905
906static struct svc_export *
907svc_export_lookup(struct svc_export *exp)
908{
909 struct cache_head *ch;
910 int hash = svc_export_hash(exp);
911
912 ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
913 if (ch)
914 return container_of(ch, struct svc_export, h);
915 else
916 return NULL;
917}
918
919static struct svc_export *
920svc_export_update(struct svc_export *new, struct svc_export *old)
921{
922 struct cache_head *ch;
923 int hash = svc_export_hash(old);
924
925 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
926 if (ch)
927 return container_of(ch, struct svc_export, h);
928 else
929 return NULL;
930}
931
932
933static struct svc_expkey *
934exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
935 u32 *fsidv, struct cache_req *reqp)
936{
937 struct svc_expkey key, *ek;
938 int err;
939
940 if (!clp)
941 return ERR_PTR(-ENOENT);
942
943 key.ek_client = clp;
944 key.ek_fsidtype = fsid_type;
945 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
946
947 ek = svc_expkey_lookup(cd, &key);
948 if (ek == NULL)
949 return ERR_PTR(-ENOMEM);
950 err = cache_check(cd, &ek->h, reqp);
951 if (err) {
952 trace_nfsd_exp_find_key(&key, err);
953 return ERR_PTR(err);
954 }
955 return ek;
956}
957
958static struct svc_export *
959exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
960 const struct path *path, struct cache_req *reqp)
961{
962 struct svc_export *exp, key;
963 int err;
964
965 if (!clp)
966 return ERR_PTR(-ENOENT);
967
968 key.ex_client = clp;
969 key.ex_path = *path;
970 key.cd = cd;
971
972 exp = svc_export_lookup(&key);
973 if (exp == NULL)
974 return ERR_PTR(-ENOMEM);
975 err = cache_check(cd, &exp->h, reqp);
976 if (err) {
977 trace_nfsd_exp_get_by_name(&key, err);
978 return ERR_PTR(err);
979 }
980 return exp;
981}
982
983/*
984 * Find the export entry for a given dentry.
985 */
986static struct svc_export *
987exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
988{
989 struct dentry *saved = dget(path->dentry);
990 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
991
992 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
993 struct dentry *parent = dget_parent(path->dentry);
994 dput(path->dentry);
995 path->dentry = parent;
996 exp = exp_get_by_name(cd, clp, path, NULL);
997 }
998 dput(path->dentry);
999 path->dentry = saved;
1000 return exp;
1001}
1002
1003
1004
1005/*
1006 * Obtain the root fh on behalf of a client.
1007 * This could be done in user space, but I feel that it adds some safety
1008 * since its harder to fool a kernel module than a user space program.
1009 */
1010int
1011exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
1012 struct knfsd_fh *f, int maxsize)
1013{
1014 struct svc_export *exp;
1015 struct path path;
1016 struct inode *inode;
1017 struct svc_fh fh;
1018 int err;
1019 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1020 struct cache_detail *cd = nn->svc_export_cache;
1021
1022 err = -EPERM;
1023 /* NB: we probably ought to check that it's NUL-terminated */
1024 if (kern_path(name, 0, &path)) {
1025 printk("nfsd: exp_rootfh path not found %s", name);
1026 return err;
1027 }
1028 inode = d_inode(path.dentry);
1029
1030 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1031 name, path.dentry, clp->name,
1032 inode->i_sb->s_id, inode->i_ino);
1033 exp = exp_parent(cd, clp, &path);
1034 if (IS_ERR(exp)) {
1035 err = PTR_ERR(exp);
1036 goto out;
1037 }
1038
1039 /*
1040 * fh must be initialized before calling fh_compose
1041 */
1042 fh_init(&fh, maxsize);
1043 if (fh_compose(&fh, exp, path.dentry, NULL))
1044 err = -EINVAL;
1045 else
1046 err = 0;
1047 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1048 fh_put(&fh);
1049 exp_put(exp);
1050out:
1051 path_put(&path);
1052 return err;
1053}
1054
1055static struct svc_export *exp_find(struct cache_detail *cd,
1056 struct auth_domain *clp, int fsid_type,
1057 u32 *fsidv, struct cache_req *reqp)
1058{
1059 struct svc_export *exp;
1060 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
1061 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1062 if (IS_ERR(ek))
1063 return ERR_CAST(ek);
1064
1065 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
1066 cache_put(&ek->h, nn->svc_expkey_cache);
1067
1068 if (IS_ERR(exp))
1069 return ERR_CAST(exp);
1070 return exp;
1071}
1072
1073__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1074{
1075 struct exp_flavor_info *f, *end = exp->ex_flavors + exp->ex_nflavors;
1076 struct svc_xprt *xprt = rqstp->rq_xprt;
1077
1078 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) {
1079 if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags))
1080 goto ok;
1081 }
1082 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) {
1083 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1084 !test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1085 goto ok;
1086 }
1087 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) {
1088 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1089 test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1090 goto ok;
1091 }
1092 goto denied;
1093
1094ok:
1095 /* legacy gss-only clients are always OK: */
1096 if (exp->ex_client == rqstp->rq_gssclient)
1097 return 0;
1098 /* ip-address based client; check sec= export option: */
1099 for (f = exp->ex_flavors; f < end; f++) {
1100 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
1101 return 0;
1102 }
1103 /* defaults in absence of sec= options: */
1104 if (exp->ex_nflavors == 0) {
1105 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1106 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
1107 return 0;
1108 }
1109
1110 /* If the compound op contains a spo_must_allowed op,
1111 * it will be sent with integrity/protection which
1112 * will have to be expressly allowed on mounts that
1113 * don't support it
1114 */
1115
1116 if (nfsd4_spo_must_allow(rqstp))
1117 return 0;
1118
1119denied:
1120 return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec;
1121}
1122
1123/*
1124 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1125 * auth_unix client) if it's available and has secinfo information;
1126 * otherwise, will try to use rq_gssclient.
1127 *
1128 * Called from functions that handle requests; functions that do work on
1129 * behalf of mountd are passed a single client name to use, and should
1130 * use exp_get_by_name() or exp_find().
1131 */
1132struct svc_export *
1133rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1134{
1135 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1136 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1137 struct cache_detail *cd = nn->svc_export_cache;
1138
1139 if (rqstp->rq_client == NULL)
1140 goto gss;
1141
1142 /* First try the auth_unix client: */
1143 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
1144 if (PTR_ERR(exp) == -ENOENT)
1145 goto gss;
1146 if (IS_ERR(exp))
1147 return exp;
1148 /* If it has secinfo, assume there are no gss/... clients */
1149 if (exp->ex_nflavors > 0)
1150 return exp;
1151gss:
1152 /* Otherwise, try falling back on gss client */
1153 if (rqstp->rq_gssclient == NULL)
1154 return exp;
1155 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1156 if (PTR_ERR(gssexp) == -ENOENT)
1157 return exp;
1158 if (!IS_ERR(exp))
1159 exp_put(exp);
1160 return gssexp;
1161}
1162
1163struct svc_export *
1164rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1165{
1166 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1167 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1168 struct cache_detail *cd = nn->svc_export_cache;
1169
1170 if (rqstp->rq_client == NULL)
1171 goto gss;
1172
1173 /* First try the auth_unix client: */
1174 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1175 fsidv, &rqstp->rq_chandle);
1176 if (PTR_ERR(exp) == -ENOENT)
1177 goto gss;
1178 if (IS_ERR(exp))
1179 return exp;
1180 /* If it has secinfo, assume there are no gss/... clients */
1181 if (exp->ex_nflavors > 0)
1182 return exp;
1183gss:
1184 /* Otherwise, try falling back on gss client */
1185 if (rqstp->rq_gssclient == NULL)
1186 return exp;
1187 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1188 &rqstp->rq_chandle);
1189 if (PTR_ERR(gssexp) == -ENOENT)
1190 return exp;
1191 if (!IS_ERR(exp))
1192 exp_put(exp);
1193 return gssexp;
1194}
1195
1196struct svc_export *
1197rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1198{
1199 struct dentry *saved = dget(path->dentry);
1200 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1201
1202 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1203 struct dentry *parent = dget_parent(path->dentry);
1204 dput(path->dentry);
1205 path->dentry = parent;
1206 exp = rqst_exp_get_by_name(rqstp, path);
1207 }
1208 dput(path->dentry);
1209 path->dentry = saved;
1210 return exp;
1211}
1212
1213struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1214{
1215 u32 fsidv[2];
1216
1217 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1218
1219 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1220}
1221
1222/*
1223 * Called when we need the filehandle for the root of the pseudofs,
1224 * for a given NFSv4 client. The root is defined to be the
1225 * export point with fsid==0
1226 */
1227__be32
1228exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1229{
1230 struct svc_export *exp;
1231 __be32 rv;
1232
1233 exp = rqst_find_fsidzero_export(rqstp);
1234 if (IS_ERR(exp))
1235 return nfserrno(PTR_ERR(exp));
1236 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1237 exp_put(exp);
1238 return rv;
1239}
1240
1241static struct flags {
1242 int flag;
1243 char *name[2];
1244} expflags[] = {
1245 { NFSEXP_READONLY, {"ro", "rw"}},
1246 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1247 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1248 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1249 { NFSEXP_ASYNC, {"async", "sync"}},
1250 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1251 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1252 { NFSEXP_NOHIDE, {"nohide", ""}},
1253 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1254 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1255 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1256 { NFSEXP_V4ROOT, {"v4root", ""}},
1257 { NFSEXP_PNFS, {"pnfs", ""}},
1258 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1259 { 0, {"", ""}}
1260};
1261
1262static void show_expflags(struct seq_file *m, int flags, int mask)
1263{
1264 struct flags *flg;
1265 int state, first = 0;
1266
1267 for (flg = expflags; flg->flag; flg++) {
1268 if (flg->flag & ~mask)
1269 continue;
1270 state = (flg->flag & flags) ? 0 : 1;
1271 if (*flg->name[state])
1272 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1273 }
1274}
1275
1276static void show_secinfo_flags(struct seq_file *m, int flags)
1277{
1278 seq_printf(m, ",");
1279 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1280}
1281
1282static bool secinfo_flags_equal(int f, int g)
1283{
1284 f &= NFSEXP_SECINFO_FLAGS;
1285 g &= NFSEXP_SECINFO_FLAGS;
1286 return f == g;
1287}
1288
1289static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1290{
1291 int flags;
1292
1293 flags = (*fp)->flags;
1294 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1295 (*fp)++;
1296 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1297 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1298 (*fp)++;
1299 }
1300 return flags;
1301}
1302
1303static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1304{
1305 struct exp_flavor_info *f;
1306 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1307 int flags;
1308
1309 if (exp->ex_nflavors == 0)
1310 return;
1311 f = exp->ex_flavors;
1312 flags = show_secinfo_run(m, &f, end);
1313 if (!secinfo_flags_equal(flags, exp->ex_flags))
1314 show_secinfo_flags(m, flags);
1315 while (f != end) {
1316 flags = show_secinfo_run(m, &f, end);
1317 show_secinfo_flags(m, flags);
1318 }
1319}
1320
1321static void exp_flags(struct seq_file *m, int flag, int fsid,
1322 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1323{
1324 struct user_namespace *userns = m->file->f_cred->user_ns;
1325
1326 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1327 if (flag & NFSEXP_FSID)
1328 seq_printf(m, ",fsid=%d", fsid);
1329 if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
1330 !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
1331 seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
1332 if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
1333 !gid_eq(anong, make_kgid(userns, 0x10000-2)))
1334 seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
1335 if (fsloc && fsloc->locations_count > 0) {
1336 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1337 int i;
1338
1339 seq_printf(m, ",%s=", loctype);
1340 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1341 seq_putc(m, '@');
1342 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1343 for (i = 1; i < fsloc->locations_count; i++) {
1344 seq_putc(m, ';');
1345 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1346 seq_putc(m, '@');
1347 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1348 }
1349 }
1350}
1351
1352static int e_show(struct seq_file *m, void *p)
1353{
1354 struct cache_head *cp = p;
1355 struct svc_export *exp = container_of(cp, struct svc_export, h);
1356 struct cache_detail *cd = m->private;
1357 bool export_stats = is_export_stats_file(m);
1358
1359 if (p == SEQ_START_TOKEN) {
1360 seq_puts(m, "# Version 1.1\n");
1361 if (export_stats)
1362 seq_puts(m, "# Path Client Start-time\n#\tStats\n");
1363 else
1364 seq_puts(m, "# Path Client(Flags) # IPs\n");
1365 return 0;
1366 }
1367
1368 exp_get(exp);
1369 if (cache_check(cd, &exp->h, NULL))
1370 return 0;
1371 exp_put(exp);
1372 return svc_export_show(m, cd, cp);
1373}
1374
1375const struct seq_operations nfs_exports_op = {
1376 .start = cache_seq_start_rcu,
1377 .next = cache_seq_next_rcu,
1378 .stop = cache_seq_stop_rcu,
1379 .show = e_show,
1380};
1381
1382/*
1383 * Initialize the exports module.
1384 */
1385int
1386nfsd_export_init(struct net *net)
1387{
1388 int rv;
1389 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1390
1391 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1392
1393 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1394 if (IS_ERR(nn->svc_export_cache))
1395 return PTR_ERR(nn->svc_export_cache);
1396 rv = cache_register_net(nn->svc_export_cache, net);
1397 if (rv)
1398 goto destroy_export_cache;
1399
1400 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1401 if (IS_ERR(nn->svc_expkey_cache)) {
1402 rv = PTR_ERR(nn->svc_expkey_cache);
1403 goto unregister_export_cache;
1404 }
1405 rv = cache_register_net(nn->svc_expkey_cache, net);
1406 if (rv)
1407 goto destroy_expkey_cache;
1408 return 0;
1409
1410destroy_expkey_cache:
1411 cache_destroy_net(nn->svc_expkey_cache, net);
1412unregister_export_cache:
1413 cache_unregister_net(nn->svc_export_cache, net);
1414destroy_export_cache:
1415 cache_destroy_net(nn->svc_export_cache, net);
1416 return rv;
1417}
1418
1419/*
1420 * Flush exports table - called when last nfsd thread is killed
1421 */
1422void
1423nfsd_export_flush(struct net *net)
1424{
1425 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1426
1427 cache_purge(nn->svc_expkey_cache);
1428 cache_purge(nn->svc_export_cache);
1429}
1430
1431/*
1432 * Shutdown the exports module.
1433 */
1434void
1435nfsd_export_shutdown(struct net *net)
1436{
1437 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1438
1439 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1440
1441 cache_unregister_net(nn->svc_expkey_cache, net);
1442 cache_unregister_net(nn->svc_export_cache, net);
1443 cache_destroy_net(nn->svc_expkey_cache, net);
1444 cache_destroy_net(nn->svc_export_cache, net);
1445 svcauth_unix_purge(net);
1446
1447 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1448}