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1/*
2 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
14#include <linux/slab.h>
15#include <linux/namei.h>
16#include <linux/module.h>
17#include <linux/exportfs.h>
18
19#include <linux/nfsd/syscall.h>
20#include <net/ipv6.h>
21
22#include "nfsd.h"
23#include "nfsfh.h"
24
25#define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27typedef struct auth_domain svc_client;
28typedef struct svc_export svc_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)
42static struct cache_head *expkey_table[EXPKEY_HASHMAX];
43
44static void expkey_put(struct kref *ref)
45{
46 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
49 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
51 auth_domain_put(key->ek_client);
52 kfree(key);
53}
54
55static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58{
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68}
69
70static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
71{
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
73}
74
75static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
77static struct cache_detail svc_expkey_cache;
78
79static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
80{
81 /* client fsidtype fsid [path] */
82 char *buf;
83 int len;
84 struct auth_domain *dom = NULL;
85 int err;
86 int fsidtype;
87 char *ep;
88 struct svc_expkey key;
89 struct svc_expkey *ek = NULL;
90
91 if (mesg[mlen-1] != '\n')
92 return -EINVAL;
93 mesg[mlen-1] = 0;
94
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 err = -ENOMEM;
97 if (!buf)
98 goto out;
99
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103
104 err = -ENOENT;
105 dom = auth_domain_find(buf);
106 if (!dom)
107 goto out;
108 dprintk("found domain %s\n", buf);
109
110 err = -EINVAL;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 fsidtype = simple_strtoul(buf, &ep, 10);
114 if (*ep)
115 goto out;
116 dprintk("found fsidtype %d\n", fsidtype);
117 if (key_len(fsidtype)==0) /* invalid type */
118 goto out;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
123 goto out;
124
125 /* OK, we seem to have a valid key */
126 key.h.flags = 0;
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
129 goto out;
130
131 key.ek_client = dom;
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
134
135 ek = svc_expkey_lookup(&key);
136 err = -ENOMEM;
137 if (!ek)
138 goto out;
139
140 /* now we want a pathname, or empty meaning NEGATIVE */
141 err = -EINVAL;
142 len = qword_get(&mesg, buf, PAGE_SIZE);
143 if (len < 0)
144 goto out;
145 dprintk("Path seems to be <%s>\n", buf);
146 err = 0;
147 if (len == 0) {
148 set_bit(CACHE_NEGATIVE, &key.h.flags);
149 ek = svc_expkey_update(&key, ek);
150 if (!ek)
151 err = -ENOMEM;
152 } else {
153 err = kern_path(buf, 0, &key.ek_path);
154 if (err)
155 goto out;
156
157 dprintk("Found the path %s\n", buf);
158
159 ek = svc_expkey_update(&key, ek);
160 if (!ek)
161 err = -ENOMEM;
162 path_put(&key.ek_path);
163 }
164 cache_flush();
165 out:
166 if (ek)
167 cache_put(&ek->h, &svc_expkey_cache);
168 if (dom)
169 auth_domain_put(dom);
170 kfree(buf);
171 return err;
172}
173
174static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
177{
178 struct svc_expkey *ek ;
179 int i;
180
181 if (h ==NULL) {
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
183 return 0;
184 }
185 ek = container_of(h, struct svc_expkey, h);
186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
187 ek->ek_fsidtype);
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
192 seq_printf(m, " ");
193 seq_path(m, &ek->ek_path, "\\ \t\n");
194 }
195 seq_printf(m, "\n");
196 return 0;
197}
198
199static inline int expkey_match (struct cache_head *a, struct cache_head *b)
200{
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
203
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
207 return 0;
208 return 1;
209}
210
211static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
213{
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
216
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
220
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
222}
223
224static inline void expkey_update(struct cache_head *cnew,
225 struct cache_head *citem)
226{
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
230 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
232}
233
234static struct cache_head *expkey_alloc(void)
235{
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
237 if (i)
238 return &i->h;
239 else
240 return NULL;
241}
242
243static struct cache_detail svc_expkey_cache = {
244 .owner = THIS_MODULE,
245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
247 .name = "nfsd.fh",
248 .cache_put = expkey_put,
249 .cache_upcall = expkey_upcall,
250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
252 .match = expkey_match,
253 .init = expkey_init,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
256};
257
258static int
259svc_expkey_hash(struct svc_expkey *item)
260{
261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
264
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
268 return hash;
269}
270
271static struct svc_expkey *
272svc_expkey_lookup(struct svc_expkey *item)
273{
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
276
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 hash);
279 if (ch)
280 return container_of(ch, struct svc_expkey, h);
281 else
282 return NULL;
283}
284
285static struct svc_expkey *
286svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
287{
288 struct cache_head *ch;
289 int hash = svc_expkey_hash(new);
290
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
292 &old->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297}
298
299
300#define EXPORT_HASHBITS 8
301#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
302
303static struct cache_head *export_table[EXPORT_HASHMAX];
304
305static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
306{
307 int i;
308
309 for (i = 0; i < fsloc->locations_count; i++) {
310 kfree(fsloc->locations[i].path);
311 kfree(fsloc->locations[i].hosts);
312 }
313 kfree(fsloc->locations);
314}
315
316static void svc_export_put(struct kref *ref)
317{
318 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
319 path_put(&exp->ex_path);
320 auth_domain_put(exp->ex_client);
321 kfree(exp->ex_pathname);
322 nfsd4_fslocs_free(&exp->ex_fslocs);
323 kfree(exp);
324}
325
326static void svc_export_request(struct cache_detail *cd,
327 struct cache_head *h,
328 char **bpp, int *blen)
329{
330 /* client path */
331 struct svc_export *exp = container_of(h, struct svc_export, h);
332 char *pth;
333
334 qword_add(bpp, blen, exp->ex_client->name);
335 pth = d_path(&exp->ex_path, *bpp, *blen);
336 if (IS_ERR(pth)) {
337 /* is this correct? */
338 (*bpp)[0] = '\n';
339 return;
340 }
341 qword_add(bpp, blen, pth);
342 (*bpp)[-1] = '\n';
343}
344
345static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
346{
347 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
348}
349
350static struct svc_export *svc_export_update(struct svc_export *new,
351 struct svc_export *old);
352static struct svc_export *svc_export_lookup(struct svc_export *);
353
354static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
355{
356
357 /*
358 * We currently export only dirs, regular files, and (for v4
359 * pseudoroot) symlinks.
360 */
361 if (!S_ISDIR(inode->i_mode) &&
362 !S_ISLNK(inode->i_mode) &&
363 !S_ISREG(inode->i_mode))
364 return -ENOTDIR;
365
366 /*
367 * Mountd should never pass down a writeable V4ROOT export, but,
368 * just to make sure:
369 */
370 if (*flags & NFSEXP_V4ROOT)
371 *flags |= NFSEXP_READONLY;
372
373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
381 !(*flags & NFSEXP_FSID) &&
382 uuid == NULL) {
383 dprintk("exp_export: export of non-dev fs without fsid\n");
384 return -EINVAL;
385 }
386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
393 return 0;
394
395}
396
397#ifdef CONFIG_NFSD_V4
398
399static int
400fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401{
402 int len;
403 int migrated, i, err;
404
405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450}
451
452static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453{
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
468 * XXX: It would be nice to also check whether this
469 * pseudoflavor is supported, so we can discover the
470 * problem at export time instead of when a client fails
471 * to authenticate.
472 */
473 err = get_int(mesg, &f->flags);
474 if (err)
475 return err;
476 /* Only some flags are allowed to differ between flavors: */
477 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
478 return -EINVAL;
479 }
480 exp->ex_nflavors = listsize;
481 return 0;
482}
483
484#else /* CONFIG_NFSD_V4 */
485static inline int
486fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
487static inline int
488secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
489#endif
490
491static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
492{
493 /* client path expiry [flags anonuid anongid fsid] */
494 char *buf;
495 int len;
496 int err;
497 struct auth_domain *dom = NULL;
498 struct svc_export exp = {}, *expp;
499 int an_int;
500
501 if (mesg[mlen-1] != '\n')
502 return -EINVAL;
503 mesg[mlen-1] = 0;
504
505 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
506 if (!buf)
507 return -ENOMEM;
508
509 /* client */
510 err = -EINVAL;
511 len = qword_get(&mesg, buf, PAGE_SIZE);
512 if (len <= 0)
513 goto out;
514
515 err = -ENOENT;
516 dom = auth_domain_find(buf);
517 if (!dom)
518 goto out;
519
520 /* path */
521 err = -EINVAL;
522 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
523 goto out1;
524
525 err = kern_path(buf, 0, &exp.ex_path);
526 if (err)
527 goto out1;
528
529 exp.ex_client = dom;
530
531 err = -ENOMEM;
532 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
533 if (!exp.ex_pathname)
534 goto out2;
535
536 /* expiry */
537 err = -EINVAL;
538 exp.h.expiry_time = get_expiry(&mesg);
539 if (exp.h.expiry_time == 0)
540 goto out3;
541
542 /* flags */
543 err = get_int(&mesg, &an_int);
544 if (err == -ENOENT) {
545 err = 0;
546 set_bit(CACHE_NEGATIVE, &exp.h.flags);
547 } else {
548 if (err || an_int < 0)
549 goto out3;
550 exp.ex_flags= an_int;
551
552 /* anon uid */
553 err = get_int(&mesg, &an_int);
554 if (err)
555 goto out3;
556 exp.ex_anon_uid= an_int;
557
558 /* anon gid */
559 err = get_int(&mesg, &an_int);
560 if (err)
561 goto out3;
562 exp.ex_anon_gid= an_int;
563
564 /* fsid */
565 err = get_int(&mesg, &an_int);
566 if (err)
567 goto out3;
568 exp.ex_fsid = an_int;
569
570 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
571 if (strcmp(buf, "fsloc") == 0)
572 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
573 else if (strcmp(buf, "uuid") == 0) {
574 /* expect a 16 byte uuid encoded as \xXXXX... */
575 len = qword_get(&mesg, buf, PAGE_SIZE);
576 if (len != 16)
577 err = -EINVAL;
578 else {
579 exp.ex_uuid =
580 kmemdup(buf, 16, GFP_KERNEL);
581 if (exp.ex_uuid == NULL)
582 err = -ENOMEM;
583 }
584 } else if (strcmp(buf, "secinfo") == 0)
585 err = secinfo_parse(&mesg, buf, &exp);
586 else
587 /* quietly ignore unknown words and anything
588 * following. Newer user-space can try to set
589 * new values, then see what the result was.
590 */
591 break;
592 if (err)
593 goto out4;
594 }
595
596 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
597 exp.ex_uuid);
598 if (err)
599 goto out4;
600 }
601
602 expp = svc_export_lookup(&exp);
603 if (expp)
604 expp = svc_export_update(&exp, expp);
605 else
606 err = -ENOMEM;
607 cache_flush();
608 if (expp == NULL)
609 err = -ENOMEM;
610 else
611 exp_put(expp);
612out4:
613 nfsd4_fslocs_free(&exp.ex_fslocs);
614 kfree(exp.ex_uuid);
615out3:
616 kfree(exp.ex_pathname);
617out2:
618 path_put(&exp.ex_path);
619out1:
620 auth_domain_put(dom);
621out:
622 kfree(buf);
623 return err;
624}
625
626static void exp_flags(struct seq_file *m, int flag, int fsid,
627 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
628static void show_secinfo(struct seq_file *m, struct svc_export *exp);
629
630static int svc_export_show(struct seq_file *m,
631 struct cache_detail *cd,
632 struct cache_head *h)
633{
634 struct svc_export *exp ;
635
636 if (h ==NULL) {
637 seq_puts(m, "#path domain(flags)\n");
638 return 0;
639 }
640 exp = container_of(h, struct svc_export, h);
641 seq_path(m, &exp->ex_path, " \t\n\\");
642 seq_putc(m, '\t');
643 seq_escape(m, exp->ex_client->name, " \t\n\\");
644 seq_putc(m, '(');
645 if (test_bit(CACHE_VALID, &h->flags) &&
646 !test_bit(CACHE_NEGATIVE, &h->flags)) {
647 exp_flags(m, exp->ex_flags, exp->ex_fsid,
648 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
649 if (exp->ex_uuid) {
650 int i;
651 seq_puts(m, ",uuid=");
652 for (i=0; i<16; i++) {
653 if ((i&3) == 0 && i)
654 seq_putc(m, ':');
655 seq_printf(m, "%02x", exp->ex_uuid[i]);
656 }
657 }
658 show_secinfo(m, exp);
659 }
660 seq_puts(m, ")\n");
661 return 0;
662}
663static int svc_export_match(struct cache_head *a, struct cache_head *b)
664{
665 struct svc_export *orig = container_of(a, struct svc_export, h);
666 struct svc_export *new = container_of(b, struct svc_export, h);
667 return orig->ex_client == new->ex_client &&
668 orig->ex_path.dentry == new->ex_path.dentry &&
669 orig->ex_path.mnt == new->ex_path.mnt;
670}
671
672static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
673{
674 struct svc_export *new = container_of(cnew, struct svc_export, h);
675 struct svc_export *item = container_of(citem, struct svc_export, h);
676
677 kref_get(&item->ex_client->ref);
678 new->ex_client = item->ex_client;
679 new->ex_path.dentry = dget(item->ex_path.dentry);
680 new->ex_path.mnt = mntget(item->ex_path.mnt);
681 new->ex_pathname = NULL;
682 new->ex_fslocs.locations = NULL;
683 new->ex_fslocs.locations_count = 0;
684 new->ex_fslocs.migrated = 0;
685}
686
687static void export_update(struct cache_head *cnew, struct cache_head *citem)
688{
689 struct svc_export *new = container_of(cnew, struct svc_export, h);
690 struct svc_export *item = container_of(citem, struct svc_export, h);
691 int i;
692
693 new->ex_flags = item->ex_flags;
694 new->ex_anon_uid = item->ex_anon_uid;
695 new->ex_anon_gid = item->ex_anon_gid;
696 new->ex_fsid = item->ex_fsid;
697 new->ex_uuid = item->ex_uuid;
698 item->ex_uuid = NULL;
699 new->ex_pathname = item->ex_pathname;
700 item->ex_pathname = NULL;
701 new->ex_fslocs.locations = item->ex_fslocs.locations;
702 item->ex_fslocs.locations = NULL;
703 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
704 item->ex_fslocs.locations_count = 0;
705 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
706 item->ex_fslocs.migrated = 0;
707 new->ex_nflavors = item->ex_nflavors;
708 for (i = 0; i < MAX_SECINFO_LIST; i++) {
709 new->ex_flavors[i] = item->ex_flavors[i];
710 }
711}
712
713static struct cache_head *svc_export_alloc(void)
714{
715 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
716 if (i)
717 return &i->h;
718 else
719 return NULL;
720}
721
722struct cache_detail svc_export_cache = {
723 .owner = THIS_MODULE,
724 .hash_size = EXPORT_HASHMAX,
725 .hash_table = export_table,
726 .name = "nfsd.export",
727 .cache_put = svc_export_put,
728 .cache_upcall = svc_export_upcall,
729 .cache_parse = svc_export_parse,
730 .cache_show = svc_export_show,
731 .match = svc_export_match,
732 .init = svc_export_init,
733 .update = export_update,
734 .alloc = svc_export_alloc,
735};
736
737static int
738svc_export_hash(struct svc_export *exp)
739{
740 int hash;
741
742 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
743 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
745 return hash;
746}
747
748static struct svc_export *
749svc_export_lookup(struct svc_export *exp)
750{
751 struct cache_head *ch;
752 int hash = svc_export_hash(exp);
753
754 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
755 hash);
756 if (ch)
757 return container_of(ch, struct svc_export, h);
758 else
759 return NULL;
760}
761
762static struct svc_export *
763svc_export_update(struct svc_export *new, struct svc_export *old)
764{
765 struct cache_head *ch;
766 int hash = svc_export_hash(old);
767
768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
769 &old->h,
770 hash);
771 if (ch)
772 return container_of(ch, struct svc_export, h);
773 else
774 return NULL;
775}
776
777
778static struct svc_expkey *
779exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780{
781 struct svc_expkey key, *ek;
782 int err;
783
784 if (!clp)
785 return ERR_PTR(-ENOENT);
786
787 key.ek_client = clp;
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790
791 ek = svc_expkey_lookup(&key);
792 if (ek == NULL)
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
795 if (err)
796 return ERR_PTR(err);
797 return ek;
798}
799
800
801static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
802 struct cache_req *reqp)
803{
804 struct svc_export *exp, key;
805 int err;
806
807 if (!clp)
808 return ERR_PTR(-ENOENT);
809
810 key.ex_client = clp;
811 key.ex_path = *path;
812
813 exp = svc_export_lookup(&key);
814 if (exp == NULL)
815 return ERR_PTR(-ENOMEM);
816 err = cache_check(&svc_export_cache, &exp->h, reqp);
817 if (err)
818 return ERR_PTR(err);
819 return exp;
820}
821
822/*
823 * Find the export entry for a given dentry.
824 */
825static struct svc_export *exp_parent(svc_client *clp, struct path *path)
826{
827 struct dentry *saved = dget(path->dentry);
828 svc_export *exp = exp_get_by_name(clp, path, NULL);
829
830 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
831 struct dentry *parent = dget_parent(path->dentry);
832 dput(path->dentry);
833 path->dentry = parent;
834 exp = exp_get_by_name(clp, path, NULL);
835 }
836 dput(path->dentry);
837 path->dentry = saved;
838 return exp;
839}
840
841
842
843/*
844 * Obtain the root fh on behalf of a client.
845 * This could be done in user space, but I feel that it adds some safety
846 * since its harder to fool a kernel module than a user space program.
847 */
848int
849exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
850{
851 struct svc_export *exp;
852 struct path path;
853 struct inode *inode;
854 struct svc_fh fh;
855 int err;
856
857 err = -EPERM;
858 /* NB: we probably ought to check that it's NUL-terminated */
859 if (kern_path(name, 0, &path)) {
860 printk("nfsd: exp_rootfh path not found %s", name);
861 return err;
862 }
863 inode = path.dentry->d_inode;
864
865 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
866 name, path.dentry, clp->name,
867 inode->i_sb->s_id, inode->i_ino);
868 exp = exp_parent(clp, &path);
869 if (IS_ERR(exp)) {
870 err = PTR_ERR(exp);
871 goto out;
872 }
873
874 /*
875 * fh must be initialized before calling fh_compose
876 */
877 fh_init(&fh, maxsize);
878 if (fh_compose(&fh, exp, path.dentry, NULL))
879 err = -EINVAL;
880 else
881 err = 0;
882 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
883 fh_put(&fh);
884 exp_put(exp);
885out:
886 path_put(&path);
887 return err;
888}
889
890static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
891 u32 *fsidv, struct cache_req *reqp)
892{
893 struct svc_export *exp;
894 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
895 if (IS_ERR(ek))
896 return ERR_CAST(ek);
897
898 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
899 cache_put(&ek->h, &svc_expkey_cache);
900
901 if (IS_ERR(exp))
902 return ERR_CAST(exp);
903 return exp;
904}
905
906__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
907{
908 struct exp_flavor_info *f;
909 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
910
911 /* legacy gss-only clients are always OK: */
912 if (exp->ex_client == rqstp->rq_gssclient)
913 return 0;
914 /* ip-address based client; check sec= export option: */
915 for (f = exp->ex_flavors; f < end; f++) {
916 if (f->pseudoflavor == rqstp->rq_flavor)
917 return 0;
918 }
919 /* defaults in absence of sec= options: */
920 if (exp->ex_nflavors == 0) {
921 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
922 rqstp->rq_flavor == RPC_AUTH_UNIX)
923 return 0;
924 }
925 return nfserr_wrongsec;
926}
927
928/*
929 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
930 * auth_unix client) if it's available and has secinfo information;
931 * otherwise, will try to use rq_gssclient.
932 *
933 * Called from functions that handle requests; functions that do work on
934 * behalf of mountd are passed a single client name to use, and should
935 * use exp_get_by_name() or exp_find().
936 */
937struct svc_export *
938rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
939{
940 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
941
942 if (rqstp->rq_client == NULL)
943 goto gss;
944
945 /* First try the auth_unix client: */
946 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
947 if (PTR_ERR(exp) == -ENOENT)
948 goto gss;
949 if (IS_ERR(exp))
950 return exp;
951 /* If it has secinfo, assume there are no gss/... clients */
952 if (exp->ex_nflavors > 0)
953 return exp;
954gss:
955 /* Otherwise, try falling back on gss client */
956 if (rqstp->rq_gssclient == NULL)
957 return exp;
958 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
959 if (PTR_ERR(gssexp) == -ENOENT)
960 return exp;
961 if (!IS_ERR(exp))
962 exp_put(exp);
963 return gssexp;
964}
965
966struct svc_export *
967rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
968{
969 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
970
971 if (rqstp->rq_client == NULL)
972 goto gss;
973
974 /* First try the auth_unix client: */
975 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
976 if (PTR_ERR(exp) == -ENOENT)
977 goto gss;
978 if (IS_ERR(exp))
979 return exp;
980 /* If it has secinfo, assume there are no gss/... clients */
981 if (exp->ex_nflavors > 0)
982 return exp;
983gss:
984 /* Otherwise, try falling back on gss client */
985 if (rqstp->rq_gssclient == NULL)
986 return exp;
987 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
988 &rqstp->rq_chandle);
989 if (PTR_ERR(gssexp) == -ENOENT)
990 return exp;
991 if (!IS_ERR(exp))
992 exp_put(exp);
993 return gssexp;
994}
995
996struct svc_export *
997rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
998{
999 struct dentry *saved = dget(path->dentry);
1000 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1001
1002 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1003 struct dentry *parent = dget_parent(path->dentry);
1004 dput(path->dentry);
1005 path->dentry = parent;
1006 exp = rqst_exp_get_by_name(rqstp, path);
1007 }
1008 dput(path->dentry);
1009 path->dentry = saved;
1010 return exp;
1011}
1012
1013static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1014{
1015 u32 fsidv[2];
1016
1017 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1018
1019 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1020}
1021
1022/*
1023 * Called when we need the filehandle for the root of the pseudofs,
1024 * for a given NFSv4 client. The root is defined to be the
1025 * export point with fsid==0
1026 */
1027__be32
1028exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1029{
1030 struct svc_export *exp;
1031 __be32 rv;
1032
1033 exp = find_fsidzero_export(rqstp);
1034 if (IS_ERR(exp))
1035 return nfserrno(PTR_ERR(exp));
1036 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1037 exp_put(exp);
1038 return rv;
1039}
1040
1041/* Iterator */
1042
1043static void *e_start(struct seq_file *m, loff_t *pos)
1044 __acquires(svc_export_cache.hash_lock)
1045{
1046 loff_t n = *pos;
1047 unsigned hash, export;
1048 struct cache_head *ch;
1049
1050 read_lock(&svc_export_cache.hash_lock);
1051 if (!n--)
1052 return SEQ_START_TOKEN;
1053 hash = n >> 32;
1054 export = n & ((1LL<<32) - 1);
1055
1056
1057 for (ch=export_table[hash]; ch; ch=ch->next)
1058 if (!export--)
1059 return ch;
1060 n &= ~((1LL<<32) - 1);
1061 do {
1062 hash++;
1063 n += 1LL<<32;
1064 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1065 if (hash >= EXPORT_HASHMAX)
1066 return NULL;
1067 *pos = n+1;
1068 return export_table[hash];
1069}
1070
1071static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1072{
1073 struct cache_head *ch = p;
1074 int hash = (*pos >> 32);
1075
1076 if (p == SEQ_START_TOKEN)
1077 hash = 0;
1078 else if (ch->next == NULL) {
1079 hash++;
1080 *pos += 1LL<<32;
1081 } else {
1082 ++*pos;
1083 return ch->next;
1084 }
1085 *pos &= ~((1LL<<32) - 1);
1086 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1087 hash++;
1088 *pos += 1LL<<32;
1089 }
1090 if (hash >= EXPORT_HASHMAX)
1091 return NULL;
1092 ++*pos;
1093 return export_table[hash];
1094}
1095
1096static void e_stop(struct seq_file *m, void *p)
1097 __releases(svc_export_cache.hash_lock)
1098{
1099 read_unlock(&svc_export_cache.hash_lock);
1100}
1101
1102static struct flags {
1103 int flag;
1104 char *name[2];
1105} expflags[] = {
1106 { NFSEXP_READONLY, {"ro", "rw"}},
1107 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1108 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1109 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1110 { NFSEXP_ASYNC, {"async", "sync"}},
1111 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1112 { NFSEXP_NOHIDE, {"nohide", ""}},
1113 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1114 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1115 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1116 { NFSEXP_V4ROOT, {"v4root", ""}},
1117 { 0, {"", ""}}
1118};
1119
1120static void show_expflags(struct seq_file *m, int flags, int mask)
1121{
1122 struct flags *flg;
1123 int state, first = 0;
1124
1125 for (flg = expflags; flg->flag; flg++) {
1126 if (flg->flag & ~mask)
1127 continue;
1128 state = (flg->flag & flags) ? 0 : 1;
1129 if (*flg->name[state])
1130 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1131 }
1132}
1133
1134static void show_secinfo_flags(struct seq_file *m, int flags)
1135{
1136 seq_printf(m, ",");
1137 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1138}
1139
1140static bool secinfo_flags_equal(int f, int g)
1141{
1142 f &= NFSEXP_SECINFO_FLAGS;
1143 g &= NFSEXP_SECINFO_FLAGS;
1144 return f == g;
1145}
1146
1147static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1148{
1149 int flags;
1150
1151 flags = (*fp)->flags;
1152 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1153 (*fp)++;
1154 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1155 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1156 (*fp)++;
1157 }
1158 return flags;
1159}
1160
1161static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1162{
1163 struct exp_flavor_info *f;
1164 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1165 int flags;
1166
1167 if (exp->ex_nflavors == 0)
1168 return;
1169 f = exp->ex_flavors;
1170 flags = show_secinfo_run(m, &f, end);
1171 if (!secinfo_flags_equal(flags, exp->ex_flags))
1172 show_secinfo_flags(m, flags);
1173 while (f != end) {
1174 flags = show_secinfo_run(m, &f, end);
1175 show_secinfo_flags(m, flags);
1176 }
1177}
1178
1179static void exp_flags(struct seq_file *m, int flag, int fsid,
1180 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1181{
1182 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1183 if (flag & NFSEXP_FSID)
1184 seq_printf(m, ",fsid=%d", fsid);
1185 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1186 seq_printf(m, ",anonuid=%u", anonu);
1187 if (anong != (gid_t)-2 && anong != (0x10000-2))
1188 seq_printf(m, ",anongid=%u", anong);
1189 if (fsloc && fsloc->locations_count > 0) {
1190 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1191 int i;
1192
1193 seq_printf(m, ",%s=", loctype);
1194 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1195 seq_putc(m, '@');
1196 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1197 for (i = 1; i < fsloc->locations_count; i++) {
1198 seq_putc(m, ';');
1199 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1200 seq_putc(m, '@');
1201 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1202 }
1203 }
1204}
1205
1206static int e_show(struct seq_file *m, void *p)
1207{
1208 struct cache_head *cp = p;
1209 struct svc_export *exp = container_of(cp, struct svc_export, h);
1210
1211 if (p == SEQ_START_TOKEN) {
1212 seq_puts(m, "# Version 1.1\n");
1213 seq_puts(m, "# Path Client(Flags) # IPs\n");
1214 return 0;
1215 }
1216
1217 cache_get(&exp->h);
1218 if (cache_check(&svc_export_cache, &exp->h, NULL))
1219 return 0;
1220 cache_put(&exp->h, &svc_export_cache);
1221 return svc_export_show(m, &svc_export_cache, cp);
1222}
1223
1224const struct seq_operations nfs_exports_op = {
1225 .start = e_start,
1226 .next = e_next,
1227 .stop = e_stop,
1228 .show = e_show,
1229};
1230
1231
1232/*
1233 * Initialize the exports module.
1234 */
1235int
1236nfsd_export_init(void)
1237{
1238 int rv;
1239 dprintk("nfsd: initializing export module.\n");
1240
1241 rv = cache_register(&svc_export_cache);
1242 if (rv)
1243 return rv;
1244 rv = cache_register(&svc_expkey_cache);
1245 if (rv)
1246 cache_unregister(&svc_export_cache);
1247 return rv;
1248
1249}
1250
1251/*
1252 * Flush exports table - called when last nfsd thread is killed
1253 */
1254void
1255nfsd_export_flush(void)
1256{
1257 cache_purge(&svc_expkey_cache);
1258 cache_purge(&svc_export_cache);
1259}
1260
1261/*
1262 * Shutdown the exports module.
1263 */
1264void
1265nfsd_export_shutdown(void)
1266{
1267
1268 dprintk("nfsd: shutting down export module.\n");
1269
1270 cache_unregister(&svc_expkey_cache);
1271 cache_unregister(&svc_export_cache);
1272 svcauth_unix_purge();
1273
1274 dprintk("nfsd: export shutdown complete.\n");
1275}
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 (mnt_user_ns(path->mnt) != &init_user_ns) {
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}