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(item: 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(detail: 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, lp: blen, str: ek->ek_client->name);
68 snprintf(buf: type, size: 5, fmt: "%d", ek->ek_fsidtype);
69 qword_add(bpp, lp: blen, str: type);
70 qword_addhex(bpp, lp: blen, buf: (char*)ek->ek_fsid, blen: key_len(type: 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(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0)
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(name: buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if (qword_get(bpp: &mesg, dest: 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(type: fsidtype)==0) /* invalid type */
117 goto out;
118 if ((len=qword_get(bpp: &mesg, dest: buf, PAGE_SIZE)) <= 0)
119 goto out;
120 dprintk("found fsid length %d\n", len);
121 if (len != key_len(type: fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 err = get_expiry(bpp: &mesg, rvp: &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(bpp: &mesg, dest: 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(nr: CACHE_NEGATIVE, addr: &key.h.flags);
148 ek = svc_expkey_update(cd, new: &key, old: ek);
149 if (ek)
150 trace_nfsd_expkey_update(key: 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, new: &key, old: ek);
161 if (ek)
162 trace_nfsd_expkey_update(key: ek, exp_path: buf);
163 else
164 err = -ENOMEM;
165 path_put(&key.ek_path);
166 }
167 cache_flush();
168 out:
169 if (ek)
170 cache_put(h: &ek->h, cd);
171 if (dom)
172 auth_domain_put(item: dom);
173 kfree(objp: 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, s: "#domain fsidtype fsid [path]\n");
186 return 0;
187 }
188 ek = container_of(h, struct svc_expkey, h);
189 seq_printf(m, fmt: "%s %d 0x", ek->ek_client->name,
190 ek->ek_fsidtype);
191 for (i=0; i < key_len(type: ek->ek_fsidtype)/4; i++)
192 seq_printf(m, fmt: "%08x", ek->ek_fsid[i]);
193 if (test_bit(CACHE_VALID, &h->flags) &&
194 !test_bit(CACHE_NEGATIVE, &h->flags)) {
195 seq_printf(m, fmt: " ");
196 seq_path(m, &ek->ek_path, "\\ \t\n");
197 }
198 seq_printf(m, fmt: "\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(p: orig->ek_fsid, q: new->ek_fsid, size: key_len(type: 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(kref: &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(size: 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(lock: &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(type: item->ek_fsidtype);
279
280 hash ^= hash_mem(buf: cp, length: len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(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(detail: cd, key: &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(item: new);
305
306 ch = sunrpc_cache_update(detail: cd, new: &new->h, old: &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(objp: locations[i].path);
327 kfree(objp: locations[i].hosts);
328 }
329
330 kfree(objp: 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(counters: stats->counter, num: EXP_STATS_COUNTERS_NUM);
338}
339
340static void export_stats_reset(struct export_stats *stats)
341{
342 if (stats)
343 nfsd_percpu_counters_reset(counters: stats->counter,
344 num: EXP_STATS_COUNTERS_NUM);
345}
346
347static void export_stats_destroy(struct export_stats *stats)
348{
349 if (stats)
350 nfsd_percpu_counters_destroy(counters: stats->counter,
351 num: 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(item: exp->ex_client);
359 nfsd4_fslocs_free(fsloc: &exp->ex_fslocs);
360 export_stats_destroy(stats: exp->ex_stats);
361 kfree(objp: exp->ex_stats);
362 kfree(objp: 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(detail: 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, lp: blen, str: exp->ex_client->name);
380 pth = d_path(&exp->ex_path, *bpp, *blen);
381 if (IS_ERR(ptr: pth)) {
382 /* is this correct? */
383 (*bpp)[0] = '\n';
384 return;
385 }
386 qword_add(bpp, lp: blen, str: 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(dentry: 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(nop: 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(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(bpp: mesg, anint: &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(n: fsloc->locations_count,
470 size: 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(bpp: mesg, dest: buf, PAGE_SIZE);
478 if (len <= 0)
479 goto out_free_all;
480 err = -ENOMEM;
481 fsloc->locations[i].hosts = kstrdup(s: 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(bpp: mesg, dest: buf, PAGE_SIZE);
487 if (len <= 0)
488 goto out_free_all;
489 err = -ENOMEM;
490 fsloc->locations[i].path = kstrdup(s: buf, GFP_KERNEL);
491 if (!fsloc->locations[i].path)
492 goto out_free_all;
493 }
494 /* migrated */
495 err = get_int(bpp: mesg, anint: &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(bpp: mesg, anint: &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(bpp: mesg, anint: &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(bpp: mesg, anint: &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(bpp: mesg, anint: &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(bpp: mesg, anint: &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(bpp: mesg, dest: buf, PAGE_SIZE);
586 if (len != EX_UUID_LEN)
587 return -EINVAL;
588
589 *puuid = kmemdup(p: 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(bpp: &mesg, dest: buf, PAGE_SIZE) <= 0)
616 goto out;
617
618 err = -ENOENT;
619 dom = auth_domain_find(name: buf);
620 if (!dom)
621 goto out;
622
623 /* path */
624 err = -EINVAL;
625 if (qword_get(bpp: &mesg, dest: 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(bpp: &mesg, rvp: &exp.h.expiry_time);
639 if (err)
640 goto out3;
641
642 /* flags */
643 err = get_int(bpp: &mesg, anint: &an_int);
644 if (err == -ENOENT) {
645 err = 0;
646 set_bit(nr: CACHE_NEGATIVE, addr: &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(bpp: &mesg, anint: &an_int);
654 if (err)
655 goto out3;
656 exp.ex_anon_uid= make_kuid(current_user_ns(), uid: an_int);
657
658 /* anon gid */
659 err = get_int(bpp: &mesg, anint: &an_int);
660 if (err)
661 goto out3;
662 exp.ex_anon_gid= make_kgid(current_user_ns(), gid: an_int);
663
664 /* fsid */
665 err = get_int(bpp: &mesg, anint: &an_int);
666 if (err)
667 goto out3;
668 exp.ex_fsid = an_int;
669
670 while (qword_get(bpp: &mesg, dest: buf, PAGE_SIZE) > 0) {
671 if (strcmp(buf, "fsloc") == 0)
672 err = fsloc_parse(mesg: &mesg, buf, fsloc: &exp.ex_fslocs);
673 else if (strcmp(buf, "uuid") == 0)
674 err = nfsd_uuid_parse(mesg: &mesg, buf, puuid: &exp.ex_uuid);
675 else if (strcmp(buf, "secinfo") == 0)
676 err = secinfo_parse(mesg: &mesg, buf, exp: &exp);
677 else if (strcmp(buf, "xprtsec") == 0)
678 err = xprtsec_parse(mesg: &mesg, buf, exp: &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(path: &exp.ex_path, flags: &exp.ex_flags, uuid: 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(uid: exp.ex_anon_uid))
709 goto out4;
710 if (!gid_valid(gid: exp.ex_anon_gid))
711 goto out4;
712 err = 0;
713
714 nfsd4_setup_layout_type(exp: &exp);
715 }
716
717 expp = svc_export_lookup(&exp);
718 if (!expp) {
719 err = -ENOMEM;
720 goto out4;
721 }
722 expp = svc_export_update(new: &exp, old: expp);
723 if (expp) {
724 trace_nfsd_export_update(key: expp);
725 cache_flush();
726 exp_put(exp: expp);
727 } else
728 err = -ENOMEM;
729out4:
730 nfsd4_fslocs_free(fsloc: &exp.ex_fslocs);
731 kfree(objp: exp.ex_uuid);
732out3:
733 path_put(&exp.ex_path);
734out1:
735 auth_domain_put(item: dom);
736out:
737 kfree(objp: 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, s: "#path domain start-time\n#\tstats\n");
765 else
766 seq_puts(m, s: "#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, c: '\t');
772 seq_escape(m, s: exp->ex_client->name, esc: " \t\n\\");
773 if (export_stats) {
774 struct percpu_counter *counter = exp->ex_stats->counter;
775
776 seq_printf(m, fmt: "\t%lld\n", exp->ex_stats->start_time);
777 seq_printf(m, fmt: "\tfh_stale: %lld\n",
778 percpu_counter_sum_positive(fbc: &counter[EXP_STATS_FH_STALE]));
779 seq_printf(m, fmt: "\tio_read: %lld\n",
780 percpu_counter_sum_positive(fbc: &counter[EXP_STATS_IO_READ]));
781 seq_printf(m, fmt: "\tio_write: %lld\n",
782 percpu_counter_sum_positive(fbc: &counter[EXP_STATS_IO_WRITE]));
783 seq_putc(m, c: '\n');
784 return 0;
785 }
786 seq_putc(m, c: '(');
787 if (test_bit(CACHE_VALID, &h->flags) &&
788 !test_bit(CACHE_NEGATIVE, &h->flags)) {
789 exp_flags(m, flag: exp->ex_flags, fsid: exp->ex_fsid,
790 anonu: exp->ex_anon_uid, anong: exp->ex_anon_gid, fslocs: &exp->ex_fslocs);
791 if (exp->ex_uuid) {
792 int i;
793 seq_puts(m, s: ",uuid=");
794 for (i = 0; i < EX_UUID_LEN; i++) {
795 if ((i&3) == 0 && i)
796 seq_putc(m, c: ':');
797 seq_printf(m, fmt: "%02x", exp->ex_uuid[i]);
798 }
799 }
800 show_secinfo(m, exp);
801 }
802 seq_puts(m, s: ")\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(path1: &orig->ex_path, path2: &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(kref: &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(stats: 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(size: sizeof(*i), GFP_KERNEL);
862 if (!i)
863 return NULL;
864
865 i->ex_stats = kmalloc(size: sizeof(*(i->ex_stats)), GFP_KERNEL);
866 if (!i->ex_stats) {
867 kfree(objp: i);
868 return NULL;
869 }
870
871 if (export_stats_init(stats: i->ex_stats)) {
872 kfree(objp: i->ex_stats);
873 kfree(objp: 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(ptr: exp->ex_client, EXPORT_HASHBITS);
901 hash ^= hash_ptr(ptr: exp->ex_path.dentry, EXPORT_HASHBITS);
902 hash ^= hash_ptr(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(detail: exp->cd, key: &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(exp: old);
924
925 ch = sunrpc_cache_update(detail: old->cd, new: &new->h, old: &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(error: -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, item: &key);
948 if (ek == NULL)
949 return ERR_PTR(error: -ENOMEM);
950 err = cache_check(detail: cd, h: &ek->h, rqstp: reqp);
951 if (err) {
952 trace_nfsd_exp_find_key(key: &key, status: err);
953 return ERR_PTR(error: 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(error: -ENOENT);
967
968 key.ex_client = clp;
969 key.ex_path = *path;
970 key.cd = cd;
971
972 exp = svc_export_lookup(exp: &key);
973 if (exp == NULL)
974 return ERR_PTR(error: -ENOMEM);
975 err = cache_check(detail: cd, h: &exp->h, rqstp: reqp);
976 if (err) {
977 trace_nfsd_exp_get_by_name(key: &key, status: err);
978 return ERR_PTR(error: 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(dentry: path->dentry);
990 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
991
992 while (PTR_ERR(ptr: exp) == -ENOENT && !IS_ROOT(path->dentry)) {
993 struct dentry *parent = dget_parent(dentry: 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, id: 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(dentry: 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: &path);
1034 if (IS_ERR(ptr: exp)) {
1035 err = PTR_ERR(ptr: exp);
1036 goto out;
1037 }
1038
1039 /*
1040 * fh must be initialized before calling fh_compose
1041 */
1042 fh_init(fhp: &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(net: cd->net, id: nfsd_net_id);
1061 struct svc_expkey *ek = exp_find_key(cd: nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1062 if (IS_ERR(ptr: ek))
1063 return ERR_CAST(ptr: ek);
1064
1065 exp = exp_get_by_name(cd, clp, path: &ek->ek_path, reqp);
1066 cache_put(h: &ek->h, cd: nn->svc_expkey_cache);
1067
1068 if (IS_ERR(ptr: exp))
1069 return ERR_CAST(ptr: 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(error: -ENOENT);
1136 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: 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, clp: rqstp->rq_client, path, reqp: &rqstp->rq_chandle);
1144 if (PTR_ERR(ptr: exp) == -ENOENT)
1145 goto gss;
1146 if (IS_ERR(ptr: 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, clp: rqstp->rq_gssclient, path, reqp: &rqstp->rq_chandle);
1156 if (PTR_ERR(ptr: gssexp) == -ENOENT)
1157 return exp;
1158 if (!IS_ERR(ptr: 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(error: -ENOENT);
1167 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: 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, clp: rqstp->rq_client, fsid_type,
1175 fsidv, reqp: &rqstp->rq_chandle);
1176 if (PTR_ERR(ptr: exp) == -ENOENT)
1177 goto gss;
1178 if (IS_ERR(ptr: 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, clp: rqstp->rq_gssclient, fsid_type, fsidv,
1188 reqp: &rqstp->rq_chandle);
1189 if (PTR_ERR(ptr: gssexp) == -ENOENT)
1190 return exp;
1191 if (!IS_ERR(ptr: 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(dentry: path->dentry);
1200 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1201
1202 while (PTR_ERR(ptr: exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1203 struct dentry *parent = dget_parent(dentry: 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(vers: FSID_NUM, fsidv, dev: 0, ino: 0, fsid: 0, NULL);
1218
1219 return rqst_exp_find(rqstp, fsid_type: 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(ptr: exp))
1235 return nfserrno(errno: PTR_ERR(ptr: 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, fmt: "%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, fmt: ",");
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, fmt: ",sec=%d", (*fp)->pseudoflavor);
1295 (*fp)++;
1296 while (*fp != end && secinfo_flags_equal(f: flags, g: (*fp)->flags)) {
1297 seq_printf(m, fmt: ":%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, fp: &f, end);
1313 if (!secinfo_flags_equal(f: flags, g: exp->ex_flags))
1314 show_secinfo_flags(m, flags);
1315 while (f != end) {
1316 flags = show_secinfo_run(m, fp: &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, flags: flag, NFSEXP_ALLFLAGS);
1327 if (flag & NFSEXP_FSID)
1328 seq_printf(m, fmt: ",fsid=%d", fsid);
1329 if (!uid_eq(left: anonu, right: make_kuid(from: userns, uid: (uid_t)-2)) &&
1330 !uid_eq(left: anonu, right: make_kuid(from: userns, uid: 0x10000-2)))
1331 seq_printf(m, fmt: ",anonuid=%u", from_kuid_munged(to: userns, uid: anonu));
1332 if (!gid_eq(left: anong, right: make_kgid(from: userns, gid: (gid_t)-2)) &&
1333 !gid_eq(left: anong, right: make_kgid(from: userns, gid: 0x10000-2)))
1334 seq_printf(m, fmt: ",anongid=%u", from_kgid_munged(to: userns, gid: anong));
1335 if (fsloc && fsloc->locations_count > 0) {
1336 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1337 int i;
1338
1339 seq_printf(m, fmt: ",%s=", loctype);
1340 seq_escape(m, s: fsloc->locations[0].path, esc: ",;@ \t\n\\");
1341 seq_putc(m, c: '@');
1342 seq_escape(m, s: fsloc->locations[0].hosts, esc: ",;@ \t\n\\");
1343 for (i = 1; i < fsloc->locations_count; i++) {
1344 seq_putc(m, c: ';');
1345 seq_escape(m, s: fsloc->locations[i].path, esc: ",;@ \t\n\\");
1346 seq_putc(m, c: '@');
1347 seq_escape(m, s: fsloc->locations[i].hosts, esc: ",;@ \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, s: "# Version 1.1\n");
1361 if (export_stats)
1362 seq_puts(m, s: "# Path Client Start-time\n#\tStats\n");
1363 else
1364 seq_puts(m, s: "# Path Client(Flags) # IPs\n");
1365 return 0;
1366 }
1367
1368 exp_get(exp);
1369 if (cache_check(detail: cd, h: &exp->h, NULL))
1370 return 0;
1371 exp_put(exp);
1372 return svc_export_show(m, cd, h: 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, id: 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(tmpl: &svc_export_cache_template, net);
1394 if (IS_ERR(ptr: nn->svc_export_cache))
1395 return PTR_ERR(ptr: nn->svc_export_cache);
1396 rv = cache_register_net(cd: nn->svc_export_cache, net);
1397 if (rv)
1398 goto destroy_export_cache;
1399
1400 nn->svc_expkey_cache = cache_create_net(tmpl: &svc_expkey_cache_template, net);
1401 if (IS_ERR(ptr: nn->svc_expkey_cache)) {
1402 rv = PTR_ERR(ptr: nn->svc_expkey_cache);
1403 goto unregister_export_cache;
1404 }
1405 rv = cache_register_net(cd: nn->svc_expkey_cache, net);
1406 if (rv)
1407 goto destroy_expkey_cache;
1408 return 0;
1409
1410destroy_expkey_cache:
1411 cache_destroy_net(cd: nn->svc_expkey_cache, net);
1412unregister_export_cache:
1413 cache_unregister_net(cd: nn->svc_export_cache, net);
1414destroy_export_cache:
1415 cache_destroy_net(cd: 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, id: nfsd_net_id);
1426
1427 cache_purge(detail: nn->svc_expkey_cache);
1428 cache_purge(detail: 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, id: nfsd_net_id);
1438
1439 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1440
1441 cache_unregister_net(cd: nn->svc_expkey_cache, net);
1442 cache_unregister_net(cd: nn->svc_export_cache, net);
1443 cache_destroy_net(cd: nn->svc_expkey_cache, net);
1444 cache_destroy_net(cd: nn->svc_export_cache, net);
1445 svcauth_unix_purge(net);
1446
1447 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1448}
1449

source code of linux/fs/nfsd/export.c