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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#include <linux/sunrpc/svc_xprt.h>
19
20#include "nfsd.h"
21#include "nfsfh.h"
22#include "netns.h"
23#include "pnfs.h"
24
25#define NFSDDBG_FACILITY NFSDDBG_EXPORT
26
27/*
28 * We have two caches.
29 * One maps client+vfsmnt+dentry to export options - the export map
30 * The other maps client+filehandle-fragment to export options. - the expkey map
31 *
32 * The export options are actually stored in the first map, and the
33 * second map contains a reference to the entry in the first map.
34 */
35
36#define EXPKEY_HASHBITS 8
37#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
38#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
39
40static void expkey_put(struct kref *ref)
41{
42 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
43
44 if (test_bit(CACHE_VALID, &key->h.flags) &&
45 !test_bit(CACHE_NEGATIVE, &key->h.flags))
46 path_put(&key->ek_path);
47 auth_domain_put(key->ek_client);
48 kfree(key);
49}
50
51static void expkey_request(struct cache_detail *cd,
52 struct cache_head *h,
53 char **bpp, int *blen)
54{
55 /* client fsidtype \xfsid */
56 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
57 char type[5];
58
59 qword_add(bpp, blen, ek->ek_client->name);
60 snprintf(type, 5, "%d", ek->ek_fsidtype);
61 qword_add(bpp, blen, type);
62 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
63 (*bpp)[-1] = '\n';
64}
65
66static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
67 struct svc_expkey *old);
68static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
69
70static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
71{
72 /* client fsidtype fsid expiry [path] */
73 char *buf;
74 int len;
75 struct auth_domain *dom = NULL;
76 int err;
77 int fsidtype;
78 char *ep;
79 struct svc_expkey key;
80 struct svc_expkey *ek = NULL;
81
82 if (mesg[mlen - 1] != '\n')
83 return -EINVAL;
84 mesg[mlen-1] = 0;
85
86 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
87 err = -ENOMEM;
88 if (!buf)
89 goto out;
90
91 err = -EINVAL;
92 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
93 goto out;
94
95 err = -ENOENT;
96 dom = auth_domain_find(buf);
97 if (!dom)
98 goto out;
99 dprintk("found domain %s\n", buf);
100
101 err = -EINVAL;
102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
103 goto out;
104 fsidtype = simple_strtoul(buf, &ep, 10);
105 if (*ep)
106 goto out;
107 dprintk("found fsidtype %d\n", fsidtype);
108 if (key_len(fsidtype)==0) /* invalid type */
109 goto out;
110 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
111 goto out;
112 dprintk("found fsid length %d\n", len);
113 if (len != key_len(fsidtype))
114 goto out;
115
116 /* OK, we seem to have a valid key */
117 key.h.flags = 0;
118 key.h.expiry_time = get_expiry(&mesg);
119 if (key.h.expiry_time == 0)
120 goto out;
121
122 key.ek_client = dom;
123 key.ek_fsidtype = fsidtype;
124 memcpy(key.ek_fsid, buf, len);
125
126 ek = svc_expkey_lookup(cd, &key);
127 err = -ENOMEM;
128 if (!ek)
129 goto out;
130
131 /* now we want a pathname, or empty meaning NEGATIVE */
132 err = -EINVAL;
133 len = qword_get(&mesg, buf, PAGE_SIZE);
134 if (len < 0)
135 goto out;
136 dprintk("Path seems to be <%s>\n", buf);
137 err = 0;
138 if (len == 0) {
139 set_bit(CACHE_NEGATIVE, &key.h.flags);
140 ek = svc_expkey_update(cd, &key, ek);
141 if (!ek)
142 err = -ENOMEM;
143 } else {
144 err = kern_path(buf, 0, &key.ek_path);
145 if (err)
146 goto out;
147
148 dprintk("Found the path %s\n", buf);
149
150 ek = svc_expkey_update(cd, &key, ek);
151 if (!ek)
152 err = -ENOMEM;
153 path_put(&key.ek_path);
154 }
155 cache_flush();
156 out:
157 if (ek)
158 cache_put(&ek->h, cd);
159 if (dom)
160 auth_domain_put(dom);
161 kfree(buf);
162 return err;
163}
164
165static int expkey_show(struct seq_file *m,
166 struct cache_detail *cd,
167 struct cache_head *h)
168{
169 struct svc_expkey *ek ;
170 int i;
171
172 if (h ==NULL) {
173 seq_puts(m, "#domain fsidtype fsid [path]\n");
174 return 0;
175 }
176 ek = container_of(h, struct svc_expkey, h);
177 seq_printf(m, "%s %d 0x", ek->ek_client->name,
178 ek->ek_fsidtype);
179 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
180 seq_printf(m, "%08x", ek->ek_fsid[i]);
181 if (test_bit(CACHE_VALID, &h->flags) &&
182 !test_bit(CACHE_NEGATIVE, &h->flags)) {
183 seq_printf(m, " ");
184 seq_path(m, &ek->ek_path, "\\ \t\n");
185 }
186 seq_printf(m, "\n");
187 return 0;
188}
189
190static inline int expkey_match (struct cache_head *a, struct cache_head *b)
191{
192 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
193 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
194
195 if (orig->ek_fsidtype != new->ek_fsidtype ||
196 orig->ek_client != new->ek_client ||
197 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
198 return 0;
199 return 1;
200}
201
202static inline void expkey_init(struct cache_head *cnew,
203 struct cache_head *citem)
204{
205 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
206 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
207
208 kref_get(&item->ek_client->ref);
209 new->ek_client = item->ek_client;
210 new->ek_fsidtype = item->ek_fsidtype;
211
212 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
213}
214
215static inline void expkey_update(struct cache_head *cnew,
216 struct cache_head *citem)
217{
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
221 new->ek_path = item->ek_path;
222 path_get(&item->ek_path);
223}
224
225static struct cache_head *expkey_alloc(void)
226{
227 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
228 if (i)
229 return &i->h;
230 else
231 return NULL;
232}
233
234static struct cache_detail svc_expkey_cache_template = {
235 .owner = THIS_MODULE,
236 .hash_size = EXPKEY_HASHMAX,
237 .name = "nfsd.fh",
238 .cache_put = expkey_put,
239 .cache_request = expkey_request,
240 .cache_parse = expkey_parse,
241 .cache_show = expkey_show,
242 .match = expkey_match,
243 .init = expkey_init,
244 .update = expkey_update,
245 .alloc = expkey_alloc,
246};
247
248static int
249svc_expkey_hash(struct svc_expkey *item)
250{
251 int hash = item->ek_fsidtype;
252 char * cp = (char*)item->ek_fsid;
253 int len = key_len(item->ek_fsidtype);
254
255 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
256 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
257 hash &= EXPKEY_HASHMASK;
258 return hash;
259}
260
261static struct svc_expkey *
262svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
263{
264 struct cache_head *ch;
265 int hash = svc_expkey_hash(item);
266
267 ch = sunrpc_cache_lookup(cd, &item->h, hash);
268 if (ch)
269 return container_of(ch, struct svc_expkey, h);
270 else
271 return NULL;
272}
273
274static struct svc_expkey *
275svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
276 struct svc_expkey *old)
277{
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(new);
280
281 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
282 if (ch)
283 return container_of(ch, struct svc_expkey, h);
284 else
285 return NULL;
286}
287
288
289#define EXPORT_HASHBITS 8
290#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
291
292static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
293{
294 struct nfsd4_fs_location *locations = fsloc->locations;
295 int i;
296
297 if (!locations)
298 return;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(locations[i].path);
302 kfree(locations[i].hosts);
303 }
304
305 kfree(locations);
306 fsloc->locations = NULL;
307}
308
309static void svc_export_put(struct kref *ref)
310{
311 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
312 path_put(&exp->ex_path);
313 auth_domain_put(exp->ex_client);
314 nfsd4_fslocs_free(&exp->ex_fslocs);
315 kfree(exp->ex_uuid);
316 kfree(exp);
317}
318
319static void svc_export_request(struct cache_detail *cd,
320 struct cache_head *h,
321 char **bpp, int *blen)
322{
323 /* client path */
324 struct svc_export *exp = container_of(h, struct svc_export, h);
325 char *pth;
326
327 qword_add(bpp, blen, exp->ex_client->name);
328 pth = d_path(&exp->ex_path, *bpp, *blen);
329 if (IS_ERR(pth)) {
330 /* is this correct? */
331 (*bpp)[0] = '\n';
332 return;
333 }
334 qword_add(bpp, blen, pth);
335 (*bpp)[-1] = '\n';
336}
337
338static struct svc_export *svc_export_update(struct svc_export *new,
339 struct svc_export *old);
340static struct svc_export *svc_export_lookup(struct svc_export *);
341
342static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
343{
344
345 /*
346 * We currently export only dirs, regular files, and (for v4
347 * pseudoroot) symlinks.
348 */
349 if (!S_ISDIR(inode->i_mode) &&
350 !S_ISLNK(inode->i_mode) &&
351 !S_ISREG(inode->i_mode))
352 return -ENOTDIR;
353
354 /*
355 * Mountd should never pass down a writeable V4ROOT export, but,
356 * just to make sure:
357 */
358 if (*flags & NFSEXP_V4ROOT)
359 *flags |= NFSEXP_READONLY;
360
361 /* There are two requirements on a filesystem to be exportable.
362 * 1: We must be able to identify the filesystem from a number.
363 * either a device number (so FS_REQUIRES_DEV needed)
364 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
365 * 2: We must be able to find an inode from a filehandle.
366 * This means that s_export_op must be set.
367 */
368 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
369 !(*flags & NFSEXP_FSID) &&
370 uuid == NULL) {
371 dprintk("exp_export: export of non-dev fs without fsid\n");
372 return -EINVAL;
373 }
374
375 if (!inode->i_sb->s_export_op ||
376 !inode->i_sb->s_export_op->fh_to_dentry) {
377 dprintk("exp_export: export of invalid fs type.\n");
378 return -EINVAL;
379 }
380
381 return 0;
382
383}
384
385#ifdef CONFIG_NFSD_V4
386
387static int
388fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
389{
390 int len;
391 int migrated, i, err;
392
393 /* more than one fsloc */
394 if (fsloc->locations)
395 return -EINVAL;
396
397 /* listsize */
398 err = get_uint(mesg, &fsloc->locations_count);
399 if (err)
400 return err;
401 if (fsloc->locations_count > MAX_FS_LOCATIONS)
402 return -EINVAL;
403 if (fsloc->locations_count == 0)
404 return 0;
405
406 fsloc->locations = kzalloc(fsloc->locations_count
407 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
408 if (!fsloc->locations)
409 return -ENOMEM;
410 for (i=0; i < fsloc->locations_count; i++) {
411 /* colon separated host list */
412 err = -EINVAL;
413 len = qword_get(mesg, buf, PAGE_SIZE);
414 if (len <= 0)
415 goto out_free_all;
416 err = -ENOMEM;
417 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
418 if (!fsloc->locations[i].hosts)
419 goto out_free_all;
420 err = -EINVAL;
421 /* slash separated path component list */
422 len = qword_get(mesg, buf, PAGE_SIZE);
423 if (len <= 0)
424 goto out_free_all;
425 err = -ENOMEM;
426 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].path)
428 goto out_free_all;
429 }
430 /* migrated */
431 err = get_int(mesg, &migrated);
432 if (err)
433 goto out_free_all;
434 err = -EINVAL;
435 if (migrated < 0 || migrated > 1)
436 goto out_free_all;
437 fsloc->migrated = migrated;
438 return 0;
439out_free_all:
440 nfsd4_fslocs_free(fsloc);
441 return err;
442}
443
444static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
445{
446 struct exp_flavor_info *f;
447 u32 listsize;
448 int err;
449
450 /* more than one secinfo */
451 if (exp->ex_nflavors)
452 return -EINVAL;
453
454 err = get_uint(mesg, &listsize);
455 if (err)
456 return err;
457 if (listsize > MAX_SECINFO_LIST)
458 return -EINVAL;
459
460 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
461 err = get_uint(mesg, &f->pseudoflavor);
462 if (err)
463 return err;
464 /*
465 * XXX: It would be nice to also check whether this
466 * pseudoflavor is supported, so we can discover the
467 * problem at export time instead of when a client fails
468 * to authenticate.
469 */
470 err = get_uint(mesg, &f->flags);
471 if (err)
472 return err;
473 /* Only some flags are allowed to differ between flavors: */
474 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
475 return -EINVAL;
476 }
477 exp->ex_nflavors = listsize;
478 return 0;
479}
480
481#else /* CONFIG_NFSD_V4 */
482static inline int
483fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
484static inline int
485secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
486#endif
487
488static inline int
489uuid_parse(char **mesg, char *buf, unsigned char **puuid)
490{
491 int len;
492
493 /* more than one uuid */
494 if (*puuid)
495 return -EINVAL;
496
497 /* expect a 16 byte uuid encoded as \xXXXX... */
498 len = qword_get(mesg, buf, PAGE_SIZE);
499 if (len != EX_UUID_LEN)
500 return -EINVAL;
501
502 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
503 if (*puuid == NULL)
504 return -ENOMEM;
505
506 return 0;
507}
508
509static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
510{
511 /* client path expiry [flags anonuid anongid fsid] */
512 char *buf;
513 int len;
514 int err;
515 struct auth_domain *dom = NULL;
516 struct svc_export exp = {}, *expp;
517 int an_int;
518
519 if (mesg[mlen-1] != '\n')
520 return -EINVAL;
521 mesg[mlen-1] = 0;
522
523 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
524 if (!buf)
525 return -ENOMEM;
526
527 /* client */
528 err = -EINVAL;
529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 if (len <= 0)
531 goto out;
532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
540 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out1;
542
543 err = kern_path(buf, 0, &exp.ex_path);
544 if (err)
545 goto out1;
546
547 exp.ex_client = dom;
548 exp.cd = cd;
549 exp.ex_devid_map = NULL;
550
551 /* expiry */
552 err = -EINVAL;
553 exp.h.expiry_time = get_expiry(&mesg);
554 if (exp.h.expiry_time == 0)
555 goto out3;
556
557 /* flags */
558 err = get_int(&mesg, &an_int);
559 if (err == -ENOENT) {
560 err = 0;
561 set_bit(CACHE_NEGATIVE, &exp.h.flags);
562 } else {
563 if (err || an_int < 0)
564 goto out3;
565 exp.ex_flags= an_int;
566
567 /* anon uid */
568 err = get_int(&mesg, &an_int);
569 if (err)
570 goto out3;
571 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
572
573 /* anon gid */
574 err = get_int(&mesg, &an_int);
575 if (err)
576 goto out3;
577 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
581 if (err)
582 goto out3;
583 exp.ex_fsid = an_int;
584
585 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
586 if (strcmp(buf, "fsloc") == 0)
587 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
588 else if (strcmp(buf, "uuid") == 0)
589 err = uuid_parse(&mesg, buf, &exp.ex_uuid);
590 else if (strcmp(buf, "secinfo") == 0)
591 err = secinfo_parse(&mesg, buf, &exp);
592 else
593 /* quietly ignore unknown words and anything
594 * following. Newer user-space can try to set
595 * new values, then see what the result was.
596 */
597 break;
598 if (err)
599 goto out4;
600 }
601
602 err = check_export(d_inode(exp.ex_path.dentry), &exp.ex_flags,
603 exp.ex_uuid);
604 if (err)
605 goto out4;
606 /*
607 * No point caching this if it would immediately expire.
608 * Also, this protects exportfs's dummy export from the
609 * anon_uid/anon_gid checks:
610 */
611 if (exp.h.expiry_time < seconds_since_boot())
612 goto out4;
613 /*
614 * For some reason exportfs has been passing down an
615 * invalid (-1) uid & gid on the "dummy" export which it
616 * uses to test export support. To make sure exportfs
617 * sees errors from check_export we therefore need to
618 * delay these checks till after check_export:
619 */
620 err = -EINVAL;
621 if (!uid_valid(exp.ex_anon_uid))
622 goto out4;
623 if (!gid_valid(exp.ex_anon_gid))
624 goto out4;
625 err = 0;
626
627 nfsd4_setup_layout_type(&exp);
628 }
629
630 expp = svc_export_lookup(&exp);
631 if (expp)
632 expp = svc_export_update(&exp, expp);
633 else
634 err = -ENOMEM;
635 cache_flush();
636 if (expp == NULL)
637 err = -ENOMEM;
638 else
639 exp_put(expp);
640out4:
641 nfsd4_fslocs_free(&exp.ex_fslocs);
642 kfree(exp.ex_uuid);
643out3:
644 path_put(&exp.ex_path);
645out1:
646 auth_domain_put(dom);
647out:
648 kfree(buf);
649 return err;
650}
651
652static void exp_flags(struct seq_file *m, int flag, int fsid,
653 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
654static void show_secinfo(struct seq_file *m, struct svc_export *exp);
655
656static int svc_export_show(struct seq_file *m,
657 struct cache_detail *cd,
658 struct cache_head *h)
659{
660 struct svc_export *exp ;
661
662 if (h ==NULL) {
663 seq_puts(m, "#path domain(flags)\n");
664 return 0;
665 }
666 exp = container_of(h, struct svc_export, h);
667 seq_path(m, &exp->ex_path, " \t\n\\");
668 seq_putc(m, '\t');
669 seq_escape(m, exp->ex_client->name, " \t\n\\");
670 seq_putc(m, '(');
671 if (test_bit(CACHE_VALID, &h->flags) &&
672 !test_bit(CACHE_NEGATIVE, &h->flags)) {
673 exp_flags(m, exp->ex_flags, exp->ex_fsid,
674 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
675 if (exp->ex_uuid) {
676 int i;
677 seq_puts(m, ",uuid=");
678 for (i = 0; i < EX_UUID_LEN; i++) {
679 if ((i&3) == 0 && i)
680 seq_putc(m, ':');
681 seq_printf(m, "%02x", exp->ex_uuid[i]);
682 }
683 }
684 show_secinfo(m, exp);
685 }
686 seq_puts(m, ")\n");
687 return 0;
688}
689static int svc_export_match(struct cache_head *a, struct cache_head *b)
690{
691 struct svc_export *orig = container_of(a, struct svc_export, h);
692 struct svc_export *new = container_of(b, struct svc_export, h);
693 return orig->ex_client == new->ex_client &&
694 path_equal(&orig->ex_path, &new->ex_path);
695}
696
697static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
698{
699 struct svc_export *new = container_of(cnew, struct svc_export, h);
700 struct svc_export *item = container_of(citem, struct svc_export, h);
701
702 kref_get(&item->ex_client->ref);
703 new->ex_client = item->ex_client;
704 new->ex_path = item->ex_path;
705 path_get(&item->ex_path);
706 new->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = 0;
708 new->ex_fslocs.migrated = 0;
709 new->ex_layout_type = 0;
710 new->ex_uuid = NULL;
711 new->cd = item->cd;
712}
713
714static void export_update(struct cache_head *cnew, struct cache_head *citem)
715{
716 struct svc_export *new = container_of(cnew, struct svc_export, h);
717 struct svc_export *item = container_of(citem, struct svc_export, h);
718 int i;
719
720 new->ex_flags = item->ex_flags;
721 new->ex_anon_uid = item->ex_anon_uid;
722 new->ex_anon_gid = item->ex_anon_gid;
723 new->ex_fsid = item->ex_fsid;
724 new->ex_devid_map = item->ex_devid_map;
725 item->ex_devid_map = NULL;
726 new->ex_uuid = item->ex_uuid;
727 item->ex_uuid = NULL;
728 new->ex_fslocs.locations = item->ex_fslocs.locations;
729 item->ex_fslocs.locations = NULL;
730 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
731 item->ex_fslocs.locations_count = 0;
732 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
733 item->ex_fslocs.migrated = 0;
734 new->ex_layout_type = item->ex_layout_type;
735 new->ex_nflavors = item->ex_nflavors;
736 for (i = 0; i < MAX_SECINFO_LIST; i++) {
737 new->ex_flavors[i] = item->ex_flavors[i];
738 }
739}
740
741static struct cache_head *svc_export_alloc(void)
742{
743 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
744 if (i)
745 return &i->h;
746 else
747 return NULL;
748}
749
750static struct cache_detail svc_export_cache_template = {
751 .owner = THIS_MODULE,
752 .hash_size = EXPORT_HASHMAX,
753 .name = "nfsd.export",
754 .cache_put = svc_export_put,
755 .cache_request = svc_export_request,
756 .cache_parse = svc_export_parse,
757 .cache_show = svc_export_show,
758 .match = svc_export_match,
759 .init = svc_export_init,
760 .update = export_update,
761 .alloc = svc_export_alloc,
762};
763
764static int
765svc_export_hash(struct svc_export *exp)
766{
767 int hash;
768
769 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
770 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
771 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
772 return hash;
773}
774
775static struct svc_export *
776svc_export_lookup(struct svc_export *exp)
777{
778 struct cache_head *ch;
779 int hash = svc_export_hash(exp);
780
781 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
782 if (ch)
783 return container_of(ch, struct svc_export, h);
784 else
785 return NULL;
786}
787
788static struct svc_export *
789svc_export_update(struct svc_export *new, struct svc_export *old)
790{
791 struct cache_head *ch;
792 int hash = svc_export_hash(old);
793
794 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
795 if (ch)
796 return container_of(ch, struct svc_export, h);
797 else
798 return NULL;
799}
800
801
802static struct svc_expkey *
803exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
804 u32 *fsidv, struct cache_req *reqp)
805{
806 struct svc_expkey key, *ek;
807 int err;
808
809 if (!clp)
810 return ERR_PTR(-ENOENT);
811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
815
816 ek = svc_expkey_lookup(cd, &key);
817 if (ek == NULL)
818 return ERR_PTR(-ENOMEM);
819 err = cache_check(cd, &ek->h, reqp);
820 if (err)
821 return ERR_PTR(err);
822 return ek;
823}
824
825static struct svc_export *
826exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
827 const struct path *path, struct cache_req *reqp)
828{
829 struct svc_export *exp, key;
830 int err;
831
832 if (!clp)
833 return ERR_PTR(-ENOENT);
834
835 key.ex_client = clp;
836 key.ex_path = *path;
837 key.cd = cd;
838
839 exp = svc_export_lookup(&key);
840 if (exp == NULL)
841 return ERR_PTR(-ENOMEM);
842 err = cache_check(cd, &exp->h, reqp);
843 if (err)
844 return ERR_PTR(err);
845 return exp;
846}
847
848/*
849 * Find the export entry for a given dentry.
850 */
851static struct svc_export *
852exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
853{
854 struct dentry *saved = dget(path->dentry);
855 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
856
857 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
858 struct dentry *parent = dget_parent(path->dentry);
859 dput(path->dentry);
860 path->dentry = parent;
861 exp = exp_get_by_name(cd, clp, path, NULL);
862 }
863 dput(path->dentry);
864 path->dentry = saved;
865 return exp;
866}
867
868
869
870/*
871 * Obtain the root fh on behalf of a client.
872 * This could be done in user space, but I feel that it adds some safety
873 * since its harder to fool a kernel module than a user space program.
874 */
875int
876exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
877 struct knfsd_fh *f, int maxsize)
878{
879 struct svc_export *exp;
880 struct path path;
881 struct inode *inode;
882 struct svc_fh fh;
883 int err;
884 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
885 struct cache_detail *cd = nn->svc_export_cache;
886
887 err = -EPERM;
888 /* NB: we probably ought to check that it's NUL-terminated */
889 if (kern_path(name, 0, &path)) {
890 printk("nfsd: exp_rootfh path not found %s", name);
891 return err;
892 }
893 inode = d_inode(path.dentry);
894
895 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
896 name, path.dentry, clp->name,
897 inode->i_sb->s_id, inode->i_ino);
898 exp = exp_parent(cd, clp, &path);
899 if (IS_ERR(exp)) {
900 err = PTR_ERR(exp);
901 goto out;
902 }
903
904 /*
905 * fh must be initialized before calling fh_compose
906 */
907 fh_init(&fh, maxsize);
908 if (fh_compose(&fh, exp, path.dentry, NULL))
909 err = -EINVAL;
910 else
911 err = 0;
912 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
913 fh_put(&fh);
914 exp_put(exp);
915out:
916 path_put(&path);
917 return err;
918}
919
920static struct svc_export *exp_find(struct cache_detail *cd,
921 struct auth_domain *clp, int fsid_type,
922 u32 *fsidv, struct cache_req *reqp)
923{
924 struct svc_export *exp;
925 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
926 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
927 if (IS_ERR(ek))
928 return ERR_CAST(ek);
929
930 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
931 cache_put(&ek->h, nn->svc_expkey_cache);
932
933 if (IS_ERR(exp))
934 return ERR_CAST(exp);
935 return exp;
936}
937
938__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
939{
940 struct exp_flavor_info *f;
941 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
942
943 /* legacy gss-only clients are always OK: */
944 if (exp->ex_client == rqstp->rq_gssclient)
945 return 0;
946 /* ip-address based client; check sec= export option: */
947 for (f = exp->ex_flavors; f < end; f++) {
948 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
949 return 0;
950 }
951 /* defaults in absence of sec= options: */
952 if (exp->ex_nflavors == 0) {
953 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
954 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
955 return 0;
956 }
957 return nfserr_wrongsec;
958}
959
960/*
961 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
962 * auth_unix client) if it's available and has secinfo information;
963 * otherwise, will try to use rq_gssclient.
964 *
965 * Called from functions that handle requests; functions that do work on
966 * behalf of mountd are passed a single client name to use, and should
967 * use exp_get_by_name() or exp_find().
968 */
969struct svc_export *
970rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
971{
972 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
973 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
974 struct cache_detail *cd = nn->svc_export_cache;
975
976 if (rqstp->rq_client == NULL)
977 goto gss;
978
979 /* First try the auth_unix client: */
980 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
981 if (PTR_ERR(exp) == -ENOENT)
982 goto gss;
983 if (IS_ERR(exp))
984 return exp;
985 /* If it has secinfo, assume there are no gss/... clients */
986 if (exp->ex_nflavors > 0)
987 return exp;
988gss:
989 /* Otherwise, try falling back on gss client */
990 if (rqstp->rq_gssclient == NULL)
991 return exp;
992 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
993 if (PTR_ERR(gssexp) == -ENOENT)
994 return exp;
995 if (!IS_ERR(exp))
996 exp_put(exp);
997 return gssexp;
998}
999
1000struct svc_export *
1001rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1002{
1003 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1004 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1005 struct cache_detail *cd = nn->svc_export_cache;
1006
1007 if (rqstp->rq_client == NULL)
1008 goto gss;
1009
1010 /* First try the auth_unix client: */
1011 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1012 fsidv, &rqstp->rq_chandle);
1013 if (PTR_ERR(exp) == -ENOENT)
1014 goto gss;
1015 if (IS_ERR(exp))
1016 return exp;
1017 /* If it has secinfo, assume there are no gss/... clients */
1018 if (exp->ex_nflavors > 0)
1019 return exp;
1020gss:
1021 /* Otherwise, try falling back on gss client */
1022 if (rqstp->rq_gssclient == NULL)
1023 return exp;
1024 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1025 &rqstp->rq_chandle);
1026 if (PTR_ERR(gssexp) == -ENOENT)
1027 return exp;
1028 if (!IS_ERR(exp))
1029 exp_put(exp);
1030 return gssexp;
1031}
1032
1033struct svc_export *
1034rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1035{
1036 struct dentry *saved = dget(path->dentry);
1037 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1038
1039 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1040 struct dentry *parent = dget_parent(path->dentry);
1041 dput(path->dentry);
1042 path->dentry = parent;
1043 exp = rqst_exp_get_by_name(rqstp, path);
1044 }
1045 dput(path->dentry);
1046 path->dentry = saved;
1047 return exp;
1048}
1049
1050struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1051{
1052 u32 fsidv[2];
1053
1054 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1055
1056 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1057}
1058
1059/*
1060 * Called when we need the filehandle for the root of the pseudofs,
1061 * for a given NFSv4 client. The root is defined to be the
1062 * export point with fsid==0
1063 */
1064__be32
1065exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1066{
1067 struct svc_export *exp;
1068 __be32 rv;
1069
1070 exp = rqst_find_fsidzero_export(rqstp);
1071 if (IS_ERR(exp))
1072 return nfserrno(PTR_ERR(exp));
1073 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1074 exp_put(exp);
1075 return rv;
1076}
1077
1078static struct flags {
1079 int flag;
1080 char *name[2];
1081} expflags[] = {
1082 { NFSEXP_READONLY, {"ro", "rw"}},
1083 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1084 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1085 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1086 { NFSEXP_ASYNC, {"async", "sync"}},
1087 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1088 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1089 { NFSEXP_NOHIDE, {"nohide", ""}},
1090 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1091 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1092 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1093 { NFSEXP_V4ROOT, {"v4root", ""}},
1094 { NFSEXP_PNFS, {"pnfs", ""}},
1095 { 0, {"", ""}}
1096};
1097
1098static void show_expflags(struct seq_file *m, int flags, int mask)
1099{
1100 struct flags *flg;
1101 int state, first = 0;
1102
1103 for (flg = expflags; flg->flag; flg++) {
1104 if (flg->flag & ~mask)
1105 continue;
1106 state = (flg->flag & flags) ? 0 : 1;
1107 if (*flg->name[state])
1108 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1109 }
1110}
1111
1112static void show_secinfo_flags(struct seq_file *m, int flags)
1113{
1114 seq_printf(m, ",");
1115 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1116}
1117
1118static bool secinfo_flags_equal(int f, int g)
1119{
1120 f &= NFSEXP_SECINFO_FLAGS;
1121 g &= NFSEXP_SECINFO_FLAGS;
1122 return f == g;
1123}
1124
1125static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1126{
1127 int flags;
1128
1129 flags = (*fp)->flags;
1130 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1131 (*fp)++;
1132 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1133 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1134 (*fp)++;
1135 }
1136 return flags;
1137}
1138
1139static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1140{
1141 struct exp_flavor_info *f;
1142 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1143 int flags;
1144
1145 if (exp->ex_nflavors == 0)
1146 return;
1147 f = exp->ex_flavors;
1148 flags = show_secinfo_run(m, &f, end);
1149 if (!secinfo_flags_equal(flags, exp->ex_flags))
1150 show_secinfo_flags(m, flags);
1151 while (f != end) {
1152 flags = show_secinfo_run(m, &f, end);
1153 show_secinfo_flags(m, flags);
1154 }
1155}
1156
1157static void exp_flags(struct seq_file *m, int flag, int fsid,
1158 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1159{
1160 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1161 if (flag & NFSEXP_FSID)
1162 seq_printf(m, ",fsid=%d", fsid);
1163 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1164 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1165 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1166 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1167 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1168 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1169 if (fsloc && fsloc->locations_count > 0) {
1170 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1171 int i;
1172
1173 seq_printf(m, ",%s=", loctype);
1174 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1175 seq_putc(m, '@');
1176 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1177 for (i = 1; i < fsloc->locations_count; i++) {
1178 seq_putc(m, ';');
1179 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1180 seq_putc(m, '@');
1181 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1182 }
1183 }
1184}
1185
1186static int e_show(struct seq_file *m, void *p)
1187{
1188 struct cache_head *cp = p;
1189 struct svc_export *exp = container_of(cp, struct svc_export, h);
1190 struct cache_detail *cd = m->private;
1191
1192 if (p == SEQ_START_TOKEN) {
1193 seq_puts(m, "# Version 1.1\n");
1194 seq_puts(m, "# Path Client(Flags) # IPs\n");
1195 return 0;
1196 }
1197
1198 exp_get(exp);
1199 if (cache_check(cd, &exp->h, NULL))
1200 return 0;
1201 exp_put(exp);
1202 return svc_export_show(m, cd, cp);
1203}
1204
1205const struct seq_operations nfs_exports_op = {
1206 .start = cache_seq_start,
1207 .next = cache_seq_next,
1208 .stop = cache_seq_stop,
1209 .show = e_show,
1210};
1211
1212/*
1213 * Initialize the exports module.
1214 */
1215int
1216nfsd_export_init(struct net *net)
1217{
1218 int rv;
1219 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1220
1221 dprintk("nfsd: initializing export module (net: %p).\n", net);
1222
1223 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1224 if (IS_ERR(nn->svc_export_cache))
1225 return PTR_ERR(nn->svc_export_cache);
1226 rv = cache_register_net(nn->svc_export_cache, net);
1227 if (rv)
1228 goto destroy_export_cache;
1229
1230 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1231 if (IS_ERR(nn->svc_expkey_cache)) {
1232 rv = PTR_ERR(nn->svc_expkey_cache);
1233 goto unregister_export_cache;
1234 }
1235 rv = cache_register_net(nn->svc_expkey_cache, net);
1236 if (rv)
1237 goto destroy_expkey_cache;
1238 return 0;
1239
1240destroy_expkey_cache:
1241 cache_destroy_net(nn->svc_expkey_cache, net);
1242unregister_export_cache:
1243 cache_unregister_net(nn->svc_export_cache, net);
1244destroy_export_cache:
1245 cache_destroy_net(nn->svc_export_cache, net);
1246 return rv;
1247}
1248
1249/*
1250 * Flush exports table - called when last nfsd thread is killed
1251 */
1252void
1253nfsd_export_flush(struct net *net)
1254{
1255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
1257 cache_purge(nn->svc_expkey_cache);
1258 cache_purge(nn->svc_export_cache);
1259}
1260
1261/*
1262 * Shutdown the exports module.
1263 */
1264void
1265nfsd_export_shutdown(struct net *net)
1266{
1267 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1268
1269 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1270
1271 cache_unregister_net(nn->svc_expkey_cache, net);
1272 cache_unregister_net(nn->svc_export_cache, net);
1273 cache_destroy_net(nn->svc_expkey_cache, net);
1274 cache_destroy_net(nn->svc_export_cache, net);
1275 svcauth_unix_purge(net);
1276
1277 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1278}
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}