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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 ((len=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 ((len=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 key.h.expiry_time = get_expiry(&mesg);
127 if (key.h.expiry_time == 0)
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 nfsd_percpu_counters_reset(stats->counter, EXP_STATS_COUNTERS_NUM);
343}
344
345static void export_stats_destroy(struct export_stats *stats)
346{
347 nfsd_percpu_counters_destroy(stats->counter, EXP_STATS_COUNTERS_NUM);
348}
349
350static void svc_export_put(struct kref *ref)
351{
352 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
353 path_put(&exp->ex_path);
354 auth_domain_put(exp->ex_client);
355 nfsd4_fslocs_free(&exp->ex_fslocs);
356 export_stats_destroy(&exp->ex_stats);
357 kfree(exp->ex_uuid);
358 kfree_rcu(exp, ex_rcu);
359}
360
361static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
362{
363 return sunrpc_cache_pipe_upcall(cd, h);
364}
365
366static void svc_export_request(struct cache_detail *cd,
367 struct cache_head *h,
368 char **bpp, int *blen)
369{
370 /* client path */
371 struct svc_export *exp = container_of(h, struct svc_export, h);
372 char *pth;
373
374 qword_add(bpp, blen, exp->ex_client->name);
375 pth = d_path(&exp->ex_path, *bpp, *blen);
376 if (IS_ERR(pth)) {
377 /* is this correct? */
378 (*bpp)[0] = '\n';
379 return;
380 }
381 qword_add(bpp, blen, pth);
382 (*bpp)[-1] = '\n';
383}
384
385static struct svc_export *svc_export_update(struct svc_export *new,
386 struct svc_export *old);
387static struct svc_export *svc_export_lookup(struct svc_export *);
388
389static int check_export(struct path *path, int *flags, unsigned char *uuid)
390{
391 struct inode *inode = d_inode(path->dentry);
392
393 /*
394 * We currently export only dirs, regular files, and (for v4
395 * pseudoroot) symlinks.
396 */
397 if (!S_ISDIR(inode->i_mode) &&
398 !S_ISLNK(inode->i_mode) &&
399 !S_ISREG(inode->i_mode))
400 return -ENOTDIR;
401
402 /*
403 * Mountd should never pass down a writeable V4ROOT export, but,
404 * just to make sure:
405 */
406 if (*flags & NFSEXP_V4ROOT)
407 *flags |= NFSEXP_READONLY;
408
409 /* There are two requirements on a filesystem to be exportable.
410 * 1: We must be able to identify the filesystem from a number.
411 * either a device number (so FS_REQUIRES_DEV needed)
412 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
413 * 2: We must be able to find an inode from a filehandle.
414 * This means that s_export_op must be set.
415 * 3: We must not currently be on an idmapped mount.
416 */
417 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
418 !(*flags & NFSEXP_FSID) &&
419 uuid == NULL) {
420 dprintk("exp_export: export of non-dev fs without fsid\n");
421 return -EINVAL;
422 }
423
424 if (!inode->i_sb->s_export_op ||
425 !inode->i_sb->s_export_op->fh_to_dentry) {
426 dprintk("exp_export: export of invalid fs type.\n");
427 return -EINVAL;
428 }
429
430 if (is_idmapped_mnt(path->mnt)) {
431 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
432 return -EINVAL;
433 }
434
435 if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
436 !(*flags & NFSEXP_NOSUBTREECHECK)) {
437 dprintk("%s: %s does not support subtree checking!\n",
438 __func__, inode->i_sb->s_type->name);
439 return -EINVAL;
440 }
441 return 0;
442
443}
444
445#ifdef CONFIG_NFSD_V4
446
447static int
448fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
449{
450 int len;
451 int migrated, i, err;
452
453 /* more than one fsloc */
454 if (fsloc->locations)
455 return -EINVAL;
456
457 /* listsize */
458 err = get_uint(mesg, &fsloc->locations_count);
459 if (err)
460 return err;
461 if (fsloc->locations_count > MAX_FS_LOCATIONS)
462 return -EINVAL;
463 if (fsloc->locations_count == 0)
464 return 0;
465
466 fsloc->locations = kcalloc(fsloc->locations_count,
467 sizeof(struct nfsd4_fs_location),
468 GFP_KERNEL);
469 if (!fsloc->locations)
470 return -ENOMEM;
471 for (i=0; i < fsloc->locations_count; i++) {
472 /* colon separated host list */
473 err = -EINVAL;
474 len = qword_get(mesg, buf, PAGE_SIZE);
475 if (len <= 0)
476 goto out_free_all;
477 err = -ENOMEM;
478 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
479 if (!fsloc->locations[i].hosts)
480 goto out_free_all;
481 err = -EINVAL;
482 /* slash separated path component list */
483 len = qword_get(mesg, buf, PAGE_SIZE);
484 if (len <= 0)
485 goto out_free_all;
486 err = -ENOMEM;
487 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
488 if (!fsloc->locations[i].path)
489 goto out_free_all;
490 }
491 /* migrated */
492 err = get_int(mesg, &migrated);
493 if (err)
494 goto out_free_all;
495 err = -EINVAL;
496 if (migrated < 0 || migrated > 1)
497 goto out_free_all;
498 fsloc->migrated = migrated;
499 return 0;
500out_free_all:
501 nfsd4_fslocs_free(fsloc);
502 return err;
503}
504
505static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
506{
507 struct exp_flavor_info *f;
508 u32 listsize;
509 int err;
510
511 /* more than one secinfo */
512 if (exp->ex_nflavors)
513 return -EINVAL;
514
515 err = get_uint(mesg, &listsize);
516 if (err)
517 return err;
518 if (listsize > MAX_SECINFO_LIST)
519 return -EINVAL;
520
521 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
522 err = get_uint(mesg, &f->pseudoflavor);
523 if (err)
524 return err;
525 /*
526 * XXX: It would be nice to also check whether this
527 * pseudoflavor is supported, so we can discover the
528 * problem at export time instead of when a client fails
529 * to authenticate.
530 */
531 err = get_uint(mesg, &f->flags);
532 if (err)
533 return err;
534 /* Only some flags are allowed to differ between flavors: */
535 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
536 return -EINVAL;
537 }
538 exp->ex_nflavors = listsize;
539 return 0;
540}
541
542#else /* CONFIG_NFSD_V4 */
543static inline int
544fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
545static inline int
546secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
547#endif
548
549static inline int
550nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
551{
552 int len;
553
554 /* more than one uuid */
555 if (*puuid)
556 return -EINVAL;
557
558 /* expect a 16 byte uuid encoded as \xXXXX... */
559 len = qword_get(mesg, buf, PAGE_SIZE);
560 if (len != EX_UUID_LEN)
561 return -EINVAL;
562
563 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
564 if (*puuid == NULL)
565 return -ENOMEM;
566
567 return 0;
568}
569
570static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
571{
572 /* client path expiry [flags anonuid anongid fsid] */
573 char *buf;
574 int len;
575 int err;
576 struct auth_domain *dom = NULL;
577 struct svc_export exp = {}, *expp;
578 int an_int;
579
580 if (mesg[mlen-1] != '\n')
581 return -EINVAL;
582 mesg[mlen-1] = 0;
583
584 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
585 if (!buf)
586 return -ENOMEM;
587
588 /* client */
589 err = -EINVAL;
590 len = qword_get(&mesg, buf, PAGE_SIZE);
591 if (len <= 0)
592 goto out;
593
594 err = -ENOENT;
595 dom = auth_domain_find(buf);
596 if (!dom)
597 goto out;
598
599 /* path */
600 err = -EINVAL;
601 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
602 goto out1;
603
604 err = kern_path(buf, 0, &exp.ex_path);
605 if (err)
606 goto out1;
607
608 exp.ex_client = dom;
609 exp.cd = cd;
610 exp.ex_devid_map = NULL;
611
612 /* expiry */
613 err = -EINVAL;
614 exp.h.expiry_time = get_expiry(&mesg);
615 if (exp.h.expiry_time == 0)
616 goto out3;
617
618 /* flags */
619 err = get_int(&mesg, &an_int);
620 if (err == -ENOENT) {
621 err = 0;
622 set_bit(CACHE_NEGATIVE, &exp.h.flags);
623 } else {
624 if (err || an_int < 0)
625 goto out3;
626 exp.ex_flags= an_int;
627
628 /* anon uid */
629 err = get_int(&mesg, &an_int);
630 if (err)
631 goto out3;
632 exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
633
634 /* anon gid */
635 err = get_int(&mesg, &an_int);
636 if (err)
637 goto out3;
638 exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
639
640 /* fsid */
641 err = get_int(&mesg, &an_int);
642 if (err)
643 goto out3;
644 exp.ex_fsid = an_int;
645
646 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
647 if (strcmp(buf, "fsloc") == 0)
648 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
649 else if (strcmp(buf, "uuid") == 0)
650 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
651 else if (strcmp(buf, "secinfo") == 0)
652 err = secinfo_parse(&mesg, buf, &exp);
653 else
654 /* quietly ignore unknown words and anything
655 * following. Newer user-space can try to set
656 * new values, then see what the result was.
657 */
658 break;
659 if (err)
660 goto out4;
661 }
662
663 err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
664 if (err)
665 goto out4;
666 /*
667 * No point caching this if it would immediately expire.
668 * Also, this protects exportfs's dummy export from the
669 * anon_uid/anon_gid checks:
670 */
671 if (exp.h.expiry_time < seconds_since_boot())
672 goto out4;
673 /*
674 * For some reason exportfs has been passing down an
675 * invalid (-1) uid & gid on the "dummy" export which it
676 * uses to test export support. To make sure exportfs
677 * sees errors from check_export we therefore need to
678 * delay these checks till after check_export:
679 */
680 err = -EINVAL;
681 if (!uid_valid(exp.ex_anon_uid))
682 goto out4;
683 if (!gid_valid(exp.ex_anon_gid))
684 goto out4;
685 err = 0;
686
687 nfsd4_setup_layout_type(&exp);
688 }
689
690 expp = svc_export_lookup(&exp);
691 if (!expp) {
692 err = -ENOMEM;
693 goto out4;
694 }
695 expp = svc_export_update(&exp, expp);
696 if (expp) {
697 trace_nfsd_export_update(expp);
698 cache_flush();
699 exp_put(expp);
700 } else
701 err = -ENOMEM;
702out4:
703 nfsd4_fslocs_free(&exp.ex_fslocs);
704 kfree(exp.ex_uuid);
705out3:
706 path_put(&exp.ex_path);
707out1:
708 auth_domain_put(dom);
709out:
710 kfree(buf);
711 return err;
712}
713
714static void exp_flags(struct seq_file *m, int flag, int fsid,
715 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
716static void show_secinfo(struct seq_file *m, struct svc_export *exp);
717
718static int is_export_stats_file(struct seq_file *m)
719{
720 /*
721 * The export_stats file uses the same ops as the exports file.
722 * We use the file's name to determine the reported info per export.
723 * There is no rename in nsfdfs, so d_name.name is stable.
724 */
725 return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats");
726}
727
728static int svc_export_show(struct seq_file *m,
729 struct cache_detail *cd,
730 struct cache_head *h)
731{
732 struct svc_export *exp;
733 bool export_stats = is_export_stats_file(m);
734
735 if (h == NULL) {
736 if (export_stats)
737 seq_puts(m, "#path domain start-time\n#\tstats\n");
738 else
739 seq_puts(m, "#path domain(flags)\n");
740 return 0;
741 }
742 exp = container_of(h, struct svc_export, h);
743 seq_path(m, &exp->ex_path, " \t\n\\");
744 seq_putc(m, '\t');
745 seq_escape(m, exp->ex_client->name, " \t\n\\");
746 if (export_stats) {
747 seq_printf(m, "\t%lld\n", exp->ex_stats.start_time);
748 seq_printf(m, "\tfh_stale: %lld\n",
749 percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_FH_STALE]));
750 seq_printf(m, "\tio_read: %lld\n",
751 percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_READ]));
752 seq_printf(m, "\tio_write: %lld\n",
753 percpu_counter_sum_positive(&exp->ex_stats.counter[EXP_STATS_IO_WRITE]));
754 seq_putc(m, '\n');
755 return 0;
756 }
757 seq_putc(m, '(');
758 if (test_bit(CACHE_VALID, &h->flags) &&
759 !test_bit(CACHE_NEGATIVE, &h->flags)) {
760 exp_flags(m, exp->ex_flags, exp->ex_fsid,
761 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
762 if (exp->ex_uuid) {
763 int i;
764 seq_puts(m, ",uuid=");
765 for (i = 0; i < EX_UUID_LEN; i++) {
766 if ((i&3) == 0 && i)
767 seq_putc(m, ':');
768 seq_printf(m, "%02x", exp->ex_uuid[i]);
769 }
770 }
771 show_secinfo(m, exp);
772 }
773 seq_puts(m, ")\n");
774 return 0;
775}
776static int svc_export_match(struct cache_head *a, struct cache_head *b)
777{
778 struct svc_export *orig = container_of(a, struct svc_export, h);
779 struct svc_export *new = container_of(b, struct svc_export, h);
780 return orig->ex_client == new->ex_client &&
781 path_equal(&orig->ex_path, &new->ex_path);
782}
783
784static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
785{
786 struct svc_export *new = container_of(cnew, struct svc_export, h);
787 struct svc_export *item = container_of(citem, struct svc_export, h);
788
789 kref_get(&item->ex_client->ref);
790 new->ex_client = item->ex_client;
791 new->ex_path = item->ex_path;
792 path_get(&item->ex_path);
793 new->ex_fslocs.locations = NULL;
794 new->ex_fslocs.locations_count = 0;
795 new->ex_fslocs.migrated = 0;
796 new->ex_layout_types = 0;
797 new->ex_uuid = NULL;
798 new->cd = item->cd;
799 export_stats_reset(&new->ex_stats);
800}
801
802static void export_update(struct cache_head *cnew, struct cache_head *citem)
803{
804 struct svc_export *new = container_of(cnew, struct svc_export, h);
805 struct svc_export *item = container_of(citem, struct svc_export, h);
806 int i;
807
808 new->ex_flags = item->ex_flags;
809 new->ex_anon_uid = item->ex_anon_uid;
810 new->ex_anon_gid = item->ex_anon_gid;
811 new->ex_fsid = item->ex_fsid;
812 new->ex_devid_map = item->ex_devid_map;
813 item->ex_devid_map = NULL;
814 new->ex_uuid = item->ex_uuid;
815 item->ex_uuid = NULL;
816 new->ex_fslocs.locations = item->ex_fslocs.locations;
817 item->ex_fslocs.locations = NULL;
818 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
819 item->ex_fslocs.locations_count = 0;
820 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
821 item->ex_fslocs.migrated = 0;
822 new->ex_layout_types = item->ex_layout_types;
823 new->ex_nflavors = item->ex_nflavors;
824 for (i = 0; i < MAX_SECINFO_LIST; i++) {
825 new->ex_flavors[i] = item->ex_flavors[i];
826 }
827}
828
829static struct cache_head *svc_export_alloc(void)
830{
831 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
832 if (!i)
833 return NULL;
834
835 if (export_stats_init(&i->ex_stats)) {
836 kfree(i);
837 return NULL;
838 }
839
840 return &i->h;
841}
842
843static const struct cache_detail svc_export_cache_template = {
844 .owner = THIS_MODULE,
845 .hash_size = EXPORT_HASHMAX,
846 .name = "nfsd.export",
847 .cache_put = svc_export_put,
848 .cache_upcall = svc_export_upcall,
849 .cache_request = svc_export_request,
850 .cache_parse = svc_export_parse,
851 .cache_show = svc_export_show,
852 .match = svc_export_match,
853 .init = svc_export_init,
854 .update = export_update,
855 .alloc = svc_export_alloc,
856};
857
858static int
859svc_export_hash(struct svc_export *exp)
860{
861 int hash;
862
863 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
864 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
865 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
866 return hash;
867}
868
869static struct svc_export *
870svc_export_lookup(struct svc_export *exp)
871{
872 struct cache_head *ch;
873 int hash = svc_export_hash(exp);
874
875 ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
876 if (ch)
877 return container_of(ch, struct svc_export, h);
878 else
879 return NULL;
880}
881
882static struct svc_export *
883svc_export_update(struct svc_export *new, struct svc_export *old)
884{
885 struct cache_head *ch;
886 int hash = svc_export_hash(old);
887
888 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
889 if (ch)
890 return container_of(ch, struct svc_export, h);
891 else
892 return NULL;
893}
894
895
896static struct svc_expkey *
897exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
898 u32 *fsidv, struct cache_req *reqp)
899{
900 struct svc_expkey key, *ek;
901 int err;
902
903 if (!clp)
904 return ERR_PTR(-ENOENT);
905
906 key.ek_client = clp;
907 key.ek_fsidtype = fsid_type;
908 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
909
910 ek = svc_expkey_lookup(cd, &key);
911 if (ek == NULL)
912 return ERR_PTR(-ENOMEM);
913 err = cache_check(cd, &ek->h, reqp);
914 if (err) {
915 trace_nfsd_exp_find_key(&key, err);
916 return ERR_PTR(err);
917 }
918 return ek;
919}
920
921static struct svc_export *
922exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
923 const struct path *path, struct cache_req *reqp)
924{
925 struct svc_export *exp, key;
926 int err;
927
928 if (!clp)
929 return ERR_PTR(-ENOENT);
930
931 key.ex_client = clp;
932 key.ex_path = *path;
933 key.cd = cd;
934
935 exp = svc_export_lookup(&key);
936 if (exp == NULL)
937 return ERR_PTR(-ENOMEM);
938 err = cache_check(cd, &exp->h, reqp);
939 if (err) {
940 trace_nfsd_exp_get_by_name(&key, err);
941 return ERR_PTR(err);
942 }
943 return exp;
944}
945
946/*
947 * Find the export entry for a given dentry.
948 */
949static struct svc_export *
950exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
951{
952 struct dentry *saved = dget(path->dentry);
953 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
954
955 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
956 struct dentry *parent = dget_parent(path->dentry);
957 dput(path->dentry);
958 path->dentry = parent;
959 exp = exp_get_by_name(cd, clp, path, NULL);
960 }
961 dput(path->dentry);
962 path->dentry = saved;
963 return exp;
964}
965
966
967
968/*
969 * Obtain the root fh on behalf of a client.
970 * This could be done in user space, but I feel that it adds some safety
971 * since its harder to fool a kernel module than a user space program.
972 */
973int
974exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
975 struct knfsd_fh *f, int maxsize)
976{
977 struct svc_export *exp;
978 struct path path;
979 struct inode *inode;
980 struct svc_fh fh;
981 int err;
982 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
983 struct cache_detail *cd = nn->svc_export_cache;
984
985 err = -EPERM;
986 /* NB: we probably ought to check that it's NUL-terminated */
987 if (kern_path(name, 0, &path)) {
988 printk("nfsd: exp_rootfh path not found %s", name);
989 return err;
990 }
991 inode = d_inode(path.dentry);
992
993 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
994 name, path.dentry, clp->name,
995 inode->i_sb->s_id, inode->i_ino);
996 exp = exp_parent(cd, clp, &path);
997 if (IS_ERR(exp)) {
998 err = PTR_ERR(exp);
999 goto out;
1000 }
1001
1002 /*
1003 * fh must be initialized before calling fh_compose
1004 */
1005 fh_init(&fh, maxsize);
1006 if (fh_compose(&fh, exp, path.dentry, NULL))
1007 err = -EINVAL;
1008 else
1009 err = 0;
1010 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1011 fh_put(&fh);
1012 exp_put(exp);
1013out:
1014 path_put(&path);
1015 return err;
1016}
1017
1018static struct svc_export *exp_find(struct cache_detail *cd,
1019 struct auth_domain *clp, int fsid_type,
1020 u32 *fsidv, struct cache_req *reqp)
1021{
1022 struct svc_export *exp;
1023 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
1024 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1025 if (IS_ERR(ek))
1026 return ERR_CAST(ek);
1027
1028 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
1029 cache_put(&ek->h, nn->svc_expkey_cache);
1030
1031 if (IS_ERR(exp))
1032 return ERR_CAST(exp);
1033 return exp;
1034}
1035
1036__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1037{
1038 struct exp_flavor_info *f;
1039 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1040
1041 /* legacy gss-only clients are always OK: */
1042 if (exp->ex_client == rqstp->rq_gssclient)
1043 return 0;
1044 /* ip-address based client; check sec= export option: */
1045 for (f = exp->ex_flavors; f < end; f++) {
1046 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
1047 return 0;
1048 }
1049 /* defaults in absence of sec= options: */
1050 if (exp->ex_nflavors == 0) {
1051 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1052 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
1053 return 0;
1054 }
1055
1056 /* If the compound op contains a spo_must_allowed op,
1057 * it will be sent with integrity/protection which
1058 * will have to be expressly allowed on mounts that
1059 * don't support it
1060 */
1061
1062 if (nfsd4_spo_must_allow(rqstp))
1063 return 0;
1064
1065 return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec;
1066}
1067
1068/*
1069 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1070 * auth_unix client) if it's available and has secinfo information;
1071 * otherwise, will try to use rq_gssclient.
1072 *
1073 * Called from functions that handle requests; functions that do work on
1074 * behalf of mountd are passed a single client name to use, and should
1075 * use exp_get_by_name() or exp_find().
1076 */
1077struct svc_export *
1078rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1079{
1080 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1081 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1082 struct cache_detail *cd = nn->svc_export_cache;
1083
1084 if (rqstp->rq_client == NULL)
1085 goto gss;
1086
1087 /* First try the auth_unix client: */
1088 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
1089 if (PTR_ERR(exp) == -ENOENT)
1090 goto gss;
1091 if (IS_ERR(exp))
1092 return exp;
1093 /* If it has secinfo, assume there are no gss/... clients */
1094 if (exp->ex_nflavors > 0)
1095 return exp;
1096gss:
1097 /* Otherwise, try falling back on gss client */
1098 if (rqstp->rq_gssclient == NULL)
1099 return exp;
1100 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1101 if (PTR_ERR(gssexp) == -ENOENT)
1102 return exp;
1103 if (!IS_ERR(exp))
1104 exp_put(exp);
1105 return gssexp;
1106}
1107
1108struct svc_export *
1109rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1110{
1111 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1112 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1113 struct cache_detail *cd = nn->svc_export_cache;
1114
1115 if (rqstp->rq_client == NULL)
1116 goto gss;
1117
1118 /* First try the auth_unix client: */
1119 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1120 fsidv, &rqstp->rq_chandle);
1121 if (PTR_ERR(exp) == -ENOENT)
1122 goto gss;
1123 if (IS_ERR(exp))
1124 return exp;
1125 /* If it has secinfo, assume there are no gss/... clients */
1126 if (exp->ex_nflavors > 0)
1127 return exp;
1128gss:
1129 /* Otherwise, try falling back on gss client */
1130 if (rqstp->rq_gssclient == NULL)
1131 return exp;
1132 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1133 &rqstp->rq_chandle);
1134 if (PTR_ERR(gssexp) == -ENOENT)
1135 return exp;
1136 if (!IS_ERR(exp))
1137 exp_put(exp);
1138 return gssexp;
1139}
1140
1141struct svc_export *
1142rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1143{
1144 struct dentry *saved = dget(path->dentry);
1145 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1146
1147 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1148 struct dentry *parent = dget_parent(path->dentry);
1149 dput(path->dentry);
1150 path->dentry = parent;
1151 exp = rqst_exp_get_by_name(rqstp, path);
1152 }
1153 dput(path->dentry);
1154 path->dentry = saved;
1155 return exp;
1156}
1157
1158struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1159{
1160 u32 fsidv[2];
1161
1162 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1163
1164 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1165}
1166
1167/*
1168 * Called when we need the filehandle for the root of the pseudofs,
1169 * for a given NFSv4 client. The root is defined to be the
1170 * export point with fsid==0
1171 */
1172__be32
1173exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1174{
1175 struct svc_export *exp;
1176 __be32 rv;
1177
1178 exp = rqst_find_fsidzero_export(rqstp);
1179 if (IS_ERR(exp))
1180 return nfserrno(PTR_ERR(exp));
1181 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1182 exp_put(exp);
1183 return rv;
1184}
1185
1186static struct flags {
1187 int flag;
1188 char *name[2];
1189} expflags[] = {
1190 { NFSEXP_READONLY, {"ro", "rw"}},
1191 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1192 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1193 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1194 { NFSEXP_ASYNC, {"async", "sync"}},
1195 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1196 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1197 { NFSEXP_NOHIDE, {"nohide", ""}},
1198 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1199 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1200 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1201 { NFSEXP_V4ROOT, {"v4root", ""}},
1202 { NFSEXP_PNFS, {"pnfs", ""}},
1203 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1204 { 0, {"", ""}}
1205};
1206
1207static void show_expflags(struct seq_file *m, int flags, int mask)
1208{
1209 struct flags *flg;
1210 int state, first = 0;
1211
1212 for (flg = expflags; flg->flag; flg++) {
1213 if (flg->flag & ~mask)
1214 continue;
1215 state = (flg->flag & flags) ? 0 : 1;
1216 if (*flg->name[state])
1217 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1218 }
1219}
1220
1221static void show_secinfo_flags(struct seq_file *m, int flags)
1222{
1223 seq_printf(m, ",");
1224 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1225}
1226
1227static bool secinfo_flags_equal(int f, int g)
1228{
1229 f &= NFSEXP_SECINFO_FLAGS;
1230 g &= NFSEXP_SECINFO_FLAGS;
1231 return f == g;
1232}
1233
1234static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1235{
1236 int flags;
1237
1238 flags = (*fp)->flags;
1239 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1240 (*fp)++;
1241 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1242 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1243 (*fp)++;
1244 }
1245 return flags;
1246}
1247
1248static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1249{
1250 struct exp_flavor_info *f;
1251 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1252 int flags;
1253
1254 if (exp->ex_nflavors == 0)
1255 return;
1256 f = exp->ex_flavors;
1257 flags = show_secinfo_run(m, &f, end);
1258 if (!secinfo_flags_equal(flags, exp->ex_flags))
1259 show_secinfo_flags(m, flags);
1260 while (f != end) {
1261 flags = show_secinfo_run(m, &f, end);
1262 show_secinfo_flags(m, flags);
1263 }
1264}
1265
1266static void exp_flags(struct seq_file *m, int flag, int fsid,
1267 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1268{
1269 struct user_namespace *userns = m->file->f_cred->user_ns;
1270
1271 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1272 if (flag & NFSEXP_FSID)
1273 seq_printf(m, ",fsid=%d", fsid);
1274 if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
1275 !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
1276 seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
1277 if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
1278 !gid_eq(anong, make_kgid(userns, 0x10000-2)))
1279 seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
1280 if (fsloc && fsloc->locations_count > 0) {
1281 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1282 int i;
1283
1284 seq_printf(m, ",%s=", loctype);
1285 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1286 seq_putc(m, '@');
1287 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1288 for (i = 1; i < fsloc->locations_count; i++) {
1289 seq_putc(m, ';');
1290 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1291 seq_putc(m, '@');
1292 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1293 }
1294 }
1295}
1296
1297static int e_show(struct seq_file *m, void *p)
1298{
1299 struct cache_head *cp = p;
1300 struct svc_export *exp = container_of(cp, struct svc_export, h);
1301 struct cache_detail *cd = m->private;
1302 bool export_stats = is_export_stats_file(m);
1303
1304 if (p == SEQ_START_TOKEN) {
1305 seq_puts(m, "# Version 1.1\n");
1306 if (export_stats)
1307 seq_puts(m, "# Path Client Start-time\n#\tStats\n");
1308 else
1309 seq_puts(m, "# Path Client(Flags) # IPs\n");
1310 return 0;
1311 }
1312
1313 exp_get(exp);
1314 if (cache_check(cd, &exp->h, NULL))
1315 return 0;
1316 exp_put(exp);
1317 return svc_export_show(m, cd, cp);
1318}
1319
1320const struct seq_operations nfs_exports_op = {
1321 .start = cache_seq_start_rcu,
1322 .next = cache_seq_next_rcu,
1323 .stop = cache_seq_stop_rcu,
1324 .show = e_show,
1325};
1326
1327/*
1328 * Initialize the exports module.
1329 */
1330int
1331nfsd_export_init(struct net *net)
1332{
1333 int rv;
1334 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1335
1336 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1337
1338 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1339 if (IS_ERR(nn->svc_export_cache))
1340 return PTR_ERR(nn->svc_export_cache);
1341 rv = cache_register_net(nn->svc_export_cache, net);
1342 if (rv)
1343 goto destroy_export_cache;
1344
1345 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1346 if (IS_ERR(nn->svc_expkey_cache)) {
1347 rv = PTR_ERR(nn->svc_expkey_cache);
1348 goto unregister_export_cache;
1349 }
1350 rv = cache_register_net(nn->svc_expkey_cache, net);
1351 if (rv)
1352 goto destroy_expkey_cache;
1353 return 0;
1354
1355destroy_expkey_cache:
1356 cache_destroy_net(nn->svc_expkey_cache, net);
1357unregister_export_cache:
1358 cache_unregister_net(nn->svc_export_cache, net);
1359destroy_export_cache:
1360 cache_destroy_net(nn->svc_export_cache, net);
1361 return rv;
1362}
1363
1364/*
1365 * Flush exports table - called when last nfsd thread is killed
1366 */
1367void
1368nfsd_export_flush(struct net *net)
1369{
1370 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1371
1372 cache_purge(nn->svc_expkey_cache);
1373 cache_purge(nn->svc_export_cache);
1374}
1375
1376/*
1377 * Shutdown the exports module.
1378 */
1379void
1380nfsd_export_shutdown(struct net *net)
1381{
1382 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1383
1384 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1385
1386 cache_unregister_net(nn->svc_expkey_cache, net);
1387 cache_unregister_net(nn->svc_export_cache, net);
1388 cache_destroy_net(nn->svc_expkey_cache, net);
1389 cache_destroy_net(nn->svc_export_cache, net);
1390 svcauth_unix_purge(net);
1391
1392 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1393}