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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/*
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 <net/ipv6.h>
21
22#include "nfsd.h"
23#include "nfsfh.h"
24#include "netns.h"
25
26#define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28typedef struct auth_domain svc_client;
29typedef struct svc_export svc_export;
30
31/*
32 * We have two caches.
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
35 *
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
38 */
39
40#define EXPKEY_HASHBITS 8
41#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
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 struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
71 struct svc_expkey *old);
72static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
73
74static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
75{
76 /* client fsidtype fsid [path] */
77 char *buf;
78 int len;
79 struct auth_domain *dom = NULL;
80 int err;
81 int fsidtype;
82 char *ep;
83 struct svc_expkey key;
84 struct svc_expkey *ek = NULL;
85
86 if (mesg[mlen - 1] != '\n')
87 return -EINVAL;
88 mesg[mlen-1] = 0;
89
90 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
91 err = -ENOMEM;
92 if (!buf)
93 goto out;
94
95 err = -EINVAL;
96 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
97 goto out;
98
99 err = -ENOENT;
100 dom = auth_domain_find(buf);
101 if (!dom)
102 goto out;
103 dprintk("found domain %s\n", buf);
104
105 err = -EINVAL;
106 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
107 goto out;
108 fsidtype = simple_strtoul(buf, &ep, 10);
109 if (*ep)
110 goto out;
111 dprintk("found fsidtype %d\n", fsidtype);
112 if (key_len(fsidtype)==0) /* invalid type */
113 goto out;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116 dprintk("found fsid length %d\n", len);
117 if (len != key_len(fsidtype))
118 goto out;
119
120 /* OK, we seem to have a valid key */
121 key.h.flags = 0;
122 key.h.expiry_time = get_expiry(&mesg);
123 if (key.h.expiry_time == 0)
124 goto out;
125
126 key.ek_client = dom;
127 key.ek_fsidtype = fsidtype;
128 memcpy(key.ek_fsid, buf, len);
129
130 ek = svc_expkey_lookup(cd, &key);
131 err = -ENOMEM;
132 if (!ek)
133 goto out;
134
135 /* now we want a pathname, or empty meaning NEGATIVE */
136 err = -EINVAL;
137 len = qword_get(&mesg, buf, PAGE_SIZE);
138 if (len < 0)
139 goto out;
140 dprintk("Path seems to be <%s>\n", buf);
141 err = 0;
142 if (len == 0) {
143 set_bit(CACHE_NEGATIVE, &key.h.flags);
144 ek = svc_expkey_update(cd, &key, ek);
145 if (!ek)
146 err = -ENOMEM;
147 } else {
148 err = kern_path(buf, 0, &key.ek_path);
149 if (err)
150 goto out;
151
152 dprintk("Found the path %s\n", buf);
153
154 ek = svc_expkey_update(cd, &key, ek);
155 if (!ek)
156 err = -ENOMEM;
157 path_put(&key.ek_path);
158 }
159 cache_flush();
160 out:
161 if (ek)
162 cache_put(&ek->h, cd);
163 if (dom)
164 auth_domain_put(dom);
165 kfree(buf);
166 return err;
167}
168
169static int expkey_show(struct seq_file *m,
170 struct cache_detail *cd,
171 struct cache_head *h)
172{
173 struct svc_expkey *ek ;
174 int i;
175
176 if (h ==NULL) {
177 seq_puts(m, "#domain fsidtype fsid [path]\n");
178 return 0;
179 }
180 ek = container_of(h, struct svc_expkey, h);
181 seq_printf(m, "%s %d 0x", ek->ek_client->name,
182 ek->ek_fsidtype);
183 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
184 seq_printf(m, "%08x", ek->ek_fsid[i]);
185 if (test_bit(CACHE_VALID, &h->flags) &&
186 !test_bit(CACHE_NEGATIVE, &h->flags)) {
187 seq_printf(m, " ");
188 seq_path(m, &ek->ek_path, "\\ \t\n");
189 }
190 seq_printf(m, "\n");
191 return 0;
192}
193
194static inline int expkey_match (struct cache_head *a, struct cache_head *b)
195{
196 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
197 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
198
199 if (orig->ek_fsidtype != new->ek_fsidtype ||
200 orig->ek_client != new->ek_client ||
201 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
202 return 0;
203 return 1;
204}
205
206static inline void expkey_init(struct cache_head *cnew,
207 struct cache_head *citem)
208{
209 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
210 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
211
212 kref_get(&item->ek_client->ref);
213 new->ek_client = item->ek_client;
214 new->ek_fsidtype = item->ek_fsidtype;
215
216 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
217}
218
219static inline void expkey_update(struct cache_head *cnew,
220 struct cache_head *citem)
221{
222 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
223 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
224
225 new->ek_path = item->ek_path;
226 path_get(&item->ek_path);
227}
228
229static struct cache_head *expkey_alloc(void)
230{
231 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
232 if (i)
233 return &i->h;
234 else
235 return NULL;
236}
237
238static struct cache_detail svc_expkey_cache_template = {
239 .owner = THIS_MODULE,
240 .hash_size = EXPKEY_HASHMAX,
241 .name = "nfsd.fh",
242 .cache_put = expkey_put,
243 .cache_request = expkey_request,
244 .cache_parse = expkey_parse,
245 .cache_show = expkey_show,
246 .match = expkey_match,
247 .init = expkey_init,
248 .update = expkey_update,
249 .alloc = expkey_alloc,
250};
251
252static int
253svc_expkey_hash(struct svc_expkey *item)
254{
255 int hash = item->ek_fsidtype;
256 char * cp = (char*)item->ek_fsid;
257 int len = key_len(item->ek_fsidtype);
258
259 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
260 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
261 hash &= EXPKEY_HASHMASK;
262 return hash;
263}
264
265static struct svc_expkey *
266svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
267{
268 struct cache_head *ch;
269 int hash = svc_expkey_hash(item);
270
271 ch = sunrpc_cache_lookup(cd, &item->h, hash);
272 if (ch)
273 return container_of(ch, struct svc_expkey, h);
274 else
275 return NULL;
276}
277
278static struct svc_expkey *
279svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
280 struct svc_expkey *old)
281{
282 struct cache_head *ch;
283 int hash = svc_expkey_hash(new);
284
285 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
286 if (ch)
287 return container_of(ch, struct svc_expkey, h);
288 else
289 return NULL;
290}
291
292
293#define EXPORT_HASHBITS 8
294#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
295
296static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
297{
298 int i;
299
300 for (i = 0; i < fsloc->locations_count; i++) {
301 kfree(fsloc->locations[i].path);
302 kfree(fsloc->locations[i].hosts);
303 }
304 kfree(fsloc->locations);
305}
306
307static void svc_export_put(struct kref *ref)
308{
309 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
310 path_put(&exp->ex_path);
311 auth_domain_put(exp->ex_client);
312 nfsd4_fslocs_free(&exp->ex_fslocs);
313 kfree(exp->ex_uuid);
314 kfree(exp);
315}
316
317static void svc_export_request(struct cache_detail *cd,
318 struct cache_head *h,
319 char **bpp, int *blen)
320{
321 /* client path */
322 struct svc_export *exp = container_of(h, struct svc_export, h);
323 char *pth;
324
325 qword_add(bpp, blen, exp->ex_client->name);
326 pth = d_path(&exp->ex_path, *bpp, *blen);
327 if (IS_ERR(pth)) {
328 /* is this correct? */
329 (*bpp)[0] = '\n';
330 return;
331 }
332 qword_add(bpp, blen, pth);
333 (*bpp)[-1] = '\n';
334}
335
336static struct svc_export *svc_export_update(struct svc_export *new,
337 struct svc_export *old);
338static struct svc_export *svc_export_lookup(struct svc_export *);
339
340static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
341{
342
343 /*
344 * We currently export only dirs, regular files, and (for v4
345 * pseudoroot) symlinks.
346 */
347 if (!S_ISDIR(inode->i_mode) &&
348 !S_ISLNK(inode->i_mode) &&
349 !S_ISREG(inode->i_mode))
350 return -ENOTDIR;
351
352 /*
353 * Mountd should never pass down a writeable V4ROOT export, but,
354 * just to make sure:
355 */
356 if (*flags & NFSEXP_V4ROOT)
357 *flags |= NFSEXP_READONLY;
358
359 /* There are two requirements on a filesystem to be exportable.
360 * 1: We must be able to identify the filesystem from a number.
361 * either a device number (so FS_REQUIRES_DEV needed)
362 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
363 * 2: We must be able to find an inode from a filehandle.
364 * This means that s_export_op must be set.
365 */
366 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
367 !(*flags & NFSEXP_FSID) &&
368 uuid == NULL) {
369 dprintk("exp_export: export of non-dev fs without fsid\n");
370 return -EINVAL;
371 }
372
373 if (!inode->i_sb->s_export_op ||
374 !inode->i_sb->s_export_op->fh_to_dentry) {
375 dprintk("exp_export: export of invalid fs type.\n");
376 return -EINVAL;
377 }
378
379 return 0;
380
381}
382
383#ifdef CONFIG_NFSD_V4
384
385static int
386fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
387{
388 int len;
389 int migrated, i, err;
390
391 /* listsize */
392 err = get_uint(mesg, &fsloc->locations_count);
393 if (err)
394 return err;
395 if (fsloc->locations_count > MAX_FS_LOCATIONS)
396 return -EINVAL;
397 if (fsloc->locations_count == 0)
398 return 0;
399
400 fsloc->locations = kzalloc(fsloc->locations_count
401 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
402 if (!fsloc->locations)
403 return -ENOMEM;
404 for (i=0; i < fsloc->locations_count; i++) {
405 /* colon separated host list */
406 err = -EINVAL;
407 len = qword_get(mesg, buf, PAGE_SIZE);
408 if (len <= 0)
409 goto out_free_all;
410 err = -ENOMEM;
411 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
412 if (!fsloc->locations[i].hosts)
413 goto out_free_all;
414 err = -EINVAL;
415 /* slash separated path component list */
416 len = qword_get(mesg, buf, PAGE_SIZE);
417 if (len <= 0)
418 goto out_free_all;
419 err = -ENOMEM;
420 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
421 if (!fsloc->locations[i].path)
422 goto out_free_all;
423 }
424 /* migrated */
425 err = get_int(mesg, &migrated);
426 if (err)
427 goto out_free_all;
428 err = -EINVAL;
429 if (migrated < 0 || migrated > 1)
430 goto out_free_all;
431 fsloc->migrated = migrated;
432 return 0;
433out_free_all:
434 nfsd4_fslocs_free(fsloc);
435 return err;
436}
437
438static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
439{
440 int listsize, err;
441 struct exp_flavor_info *f;
442
443 err = get_int(mesg, &listsize);
444 if (err)
445 return err;
446 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
447 return -EINVAL;
448
449 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
450 err = get_uint(mesg, &f->pseudoflavor);
451 if (err)
452 return err;
453 /*
454 * XXX: It would be nice to also check whether this
455 * pseudoflavor is supported, so we can discover the
456 * problem at export time instead of when a client fails
457 * to authenticate.
458 */
459 err = get_uint(mesg, &f->flags);
460 if (err)
461 return err;
462 /* Only some flags are allowed to differ between flavors: */
463 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
464 return -EINVAL;
465 }
466 exp->ex_nflavors = listsize;
467 return 0;
468}
469
470#else /* CONFIG_NFSD_V4 */
471static inline int
472fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
473static inline int
474secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
475#endif
476
477static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
478{
479 /* client path expiry [flags anonuid anongid fsid] */
480 char *buf;
481 int len;
482 int err;
483 struct auth_domain *dom = NULL;
484 struct svc_export exp = {}, *expp;
485 int an_int;
486
487 if (mesg[mlen-1] != '\n')
488 return -EINVAL;
489 mesg[mlen-1] = 0;
490
491 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
492 if (!buf)
493 return -ENOMEM;
494
495 /* client */
496 err = -EINVAL;
497 len = qword_get(&mesg, buf, PAGE_SIZE);
498 if (len <= 0)
499 goto out;
500
501 err = -ENOENT;
502 dom = auth_domain_find(buf);
503 if (!dom)
504 goto out;
505
506 /* path */
507 err = -EINVAL;
508 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
509 goto out1;
510
511 err = kern_path(buf, 0, &exp.ex_path);
512 if (err)
513 goto out1;
514
515 exp.ex_client = dom;
516 exp.cd = cd;
517
518 /* expiry */
519 err = -EINVAL;
520 exp.h.expiry_time = get_expiry(&mesg);
521 if (exp.h.expiry_time == 0)
522 goto out3;
523
524 /* flags */
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT) {
527 err = 0;
528 set_bit(CACHE_NEGATIVE, &exp.h.flags);
529 } else {
530 if (err || an_int < 0)
531 goto out3;
532 exp.ex_flags= an_int;
533
534 /* anon uid */
535 err = get_int(&mesg, &an_int);
536 if (err)
537 goto out3;
538 exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
539
540 /* anon gid */
541 err = get_int(&mesg, &an_int);
542 if (err)
543 goto out3;
544 exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
545
546 /* fsid */
547 err = get_int(&mesg, &an_int);
548 if (err)
549 goto out3;
550 exp.ex_fsid = an_int;
551
552 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
553 if (strcmp(buf, "fsloc") == 0)
554 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
555 else if (strcmp(buf, "uuid") == 0) {
556 /* expect a 16 byte uuid encoded as \xXXXX... */
557 len = qword_get(&mesg, buf, PAGE_SIZE);
558 if (len != 16)
559 err = -EINVAL;
560 else {
561 exp.ex_uuid =
562 kmemdup(buf, 16, GFP_KERNEL);
563 if (exp.ex_uuid == NULL)
564 err = -ENOMEM;
565 }
566 } else if (strcmp(buf, "secinfo") == 0)
567 err = secinfo_parse(&mesg, buf, &exp);
568 else
569 /* quietly ignore unknown words and anything
570 * following. Newer user-space can try to set
571 * new values, then see what the result was.
572 */
573 break;
574 if (err)
575 goto out4;
576 }
577
578 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
579 exp.ex_uuid);
580 if (err)
581 goto out4;
582 /*
583 * No point caching this if it would immediately expire.
584 * Also, this protects exportfs's dummy export from the
585 * anon_uid/anon_gid checks:
586 */
587 if (exp.h.expiry_time < seconds_since_boot())
588 goto out4;
589 /*
590 * For some reason exportfs has been passing down an
591 * invalid (-1) uid & gid on the "dummy" export which it
592 * uses to test export support. To make sure exportfs
593 * sees errors from check_export we therefore need to
594 * delay these checks till after check_export:
595 */
596 err = -EINVAL;
597 if (!uid_valid(exp.ex_anon_uid))
598 goto out4;
599 if (!gid_valid(exp.ex_anon_gid))
600 goto out4;
601 err = 0;
602 }
603
604 expp = svc_export_lookup(&exp);
605 if (expp)
606 expp = svc_export_update(&exp, expp);
607 else
608 err = -ENOMEM;
609 cache_flush();
610 if (expp == NULL)
611 err = -ENOMEM;
612 else
613 exp_put(expp);
614out4:
615 nfsd4_fslocs_free(&exp.ex_fslocs);
616 kfree(exp.ex_uuid);
617out3:
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 kuid_t anonu, kgid_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_fslocs.locations = NULL;
682 new->ex_fslocs.locations_count = 0;
683 new->ex_fslocs.migrated = 0;
684 new->ex_uuid = NULL;
685 new->cd = item->cd;
686}
687
688static void export_update(struct cache_head *cnew, struct cache_head *citem)
689{
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
692 int i;
693
694 new->ex_flags = item->ex_flags;
695 new->ex_anon_uid = item->ex_anon_uid;
696 new->ex_anon_gid = item->ex_anon_gid;
697 new->ex_fsid = item->ex_fsid;
698 new->ex_uuid = item->ex_uuid;
699 item->ex_uuid = NULL;
700 new->ex_fslocs.locations = item->ex_fslocs.locations;
701 item->ex_fslocs.locations = NULL;
702 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
703 item->ex_fslocs.locations_count = 0;
704 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
705 item->ex_fslocs.migrated = 0;
706 new->ex_nflavors = item->ex_nflavors;
707 for (i = 0; i < MAX_SECINFO_LIST; i++) {
708 new->ex_flavors[i] = item->ex_flavors[i];
709 }
710}
711
712static struct cache_head *svc_export_alloc(void)
713{
714 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
715 if (i)
716 return &i->h;
717 else
718 return NULL;
719}
720
721static struct cache_detail svc_export_cache_template = {
722 .owner = THIS_MODULE,
723 .hash_size = EXPORT_HASHMAX,
724 .name = "nfsd.export",
725 .cache_put = svc_export_put,
726 .cache_request = svc_export_request,
727 .cache_parse = svc_export_parse,
728 .cache_show = svc_export_show,
729 .match = svc_export_match,
730 .init = svc_export_init,
731 .update = export_update,
732 .alloc = svc_export_alloc,
733};
734
735static int
736svc_export_hash(struct svc_export *exp)
737{
738 int hash;
739
740 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
741 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
742 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
743 return hash;
744}
745
746static struct svc_export *
747svc_export_lookup(struct svc_export *exp)
748{
749 struct cache_head *ch;
750 int hash = svc_export_hash(exp);
751
752 ch = sunrpc_cache_lookup(exp->cd, &exp->h, hash);
753 if (ch)
754 return container_of(ch, struct svc_export, h);
755 else
756 return NULL;
757}
758
759static struct svc_export *
760svc_export_update(struct svc_export *new, struct svc_export *old)
761{
762 struct cache_head *ch;
763 int hash = svc_export_hash(old);
764
765 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
766 if (ch)
767 return container_of(ch, struct svc_export, h);
768 else
769 return NULL;
770}
771
772
773static struct svc_expkey *
774exp_find_key(struct cache_detail *cd, svc_client *clp, int fsid_type,
775 u32 *fsidv, struct cache_req *reqp)
776{
777 struct svc_expkey key, *ek;
778 int err;
779
780 if (!clp)
781 return ERR_PTR(-ENOENT);
782
783 key.ek_client = clp;
784 key.ek_fsidtype = fsid_type;
785 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
786
787 ek = svc_expkey_lookup(cd, &key);
788 if (ek == NULL)
789 return ERR_PTR(-ENOMEM);
790 err = cache_check(cd, &ek->h, reqp);
791 if (err)
792 return ERR_PTR(err);
793 return ek;
794}
795
796
797static svc_export *exp_get_by_name(struct cache_detail *cd, svc_client *clp,
798 const struct path *path, struct cache_req *reqp)
799{
800 struct svc_export *exp, key;
801 int err;
802
803 if (!clp)
804 return ERR_PTR(-ENOENT);
805
806 key.ex_client = clp;
807 key.ex_path = *path;
808 key.cd = cd;
809
810 exp = svc_export_lookup(&key);
811 if (exp == NULL)
812 return ERR_PTR(-ENOMEM);
813 err = cache_check(cd, &exp->h, reqp);
814 if (err)
815 return ERR_PTR(err);
816 return exp;
817}
818
819/*
820 * Find the export entry for a given dentry.
821 */
822static struct svc_export *exp_parent(struct cache_detail *cd, svc_client *clp,
823 struct path *path)
824{
825 struct dentry *saved = dget(path->dentry);
826 svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
827
828 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
829 struct dentry *parent = dget_parent(path->dentry);
830 dput(path->dentry);
831 path->dentry = parent;
832 exp = exp_get_by_name(cd, clp, path, NULL);
833 }
834 dput(path->dentry);
835 path->dentry = saved;
836 return exp;
837}
838
839
840
841/*
842 * Obtain the root fh on behalf of a client.
843 * This could be done in user space, but I feel that it adds some safety
844 * since its harder to fool a kernel module than a user space program.
845 */
846int
847exp_rootfh(struct net *net, svc_client *clp, char *name,
848 struct knfsd_fh *f, int maxsize)
849{
850 struct svc_export *exp;
851 struct path path;
852 struct inode *inode;
853 struct svc_fh fh;
854 int err;
855 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
856 struct cache_detail *cd = nn->svc_export_cache;
857
858 err = -EPERM;
859 /* NB: we probably ought to check that it's NUL-terminated */
860 if (kern_path(name, 0, &path)) {
861 printk("nfsd: exp_rootfh path not found %s", name);
862 return err;
863 }
864 inode = path.dentry->d_inode;
865
866 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
867 name, path.dentry, clp->name,
868 inode->i_sb->s_id, inode->i_ino);
869 exp = exp_parent(cd, clp, &path);
870 if (IS_ERR(exp)) {
871 err = PTR_ERR(exp);
872 goto out;
873 }
874
875 /*
876 * fh must be initialized before calling fh_compose
877 */
878 fh_init(&fh, maxsize);
879 if (fh_compose(&fh, exp, path.dentry, NULL))
880 err = -EINVAL;
881 else
882 err = 0;
883 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
884 fh_put(&fh);
885 exp_put(exp);
886out:
887 path_put(&path);
888 return err;
889}
890
891static struct svc_export *exp_find(struct cache_detail *cd,
892 struct auth_domain *clp, int fsid_type,
893 u32 *fsidv, struct cache_req *reqp)
894{
895 struct svc_export *exp;
896 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
897 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
898 if (IS_ERR(ek))
899 return ERR_CAST(ek);
900
901 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
902 cache_put(&ek->h, nn->svc_expkey_cache);
903
904 if (IS_ERR(exp))
905 return ERR_CAST(exp);
906 return exp;
907}
908
909__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
910{
911 struct exp_flavor_info *f;
912 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
913
914 /* legacy gss-only clients are always OK: */
915 if (exp->ex_client == rqstp->rq_gssclient)
916 return 0;
917 /* ip-address based client; check sec= export option: */
918 for (f = exp->ex_flavors; f < end; f++) {
919 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
920 return 0;
921 }
922 /* defaults in absence of sec= options: */
923 if (exp->ex_nflavors == 0) {
924 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
925 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
926 return 0;
927 }
928 return nfserr_wrongsec;
929}
930
931/*
932 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
933 * auth_unix client) if it's available and has secinfo information;
934 * otherwise, will try to use rq_gssclient.
935 *
936 * Called from functions that handle requests; functions that do work on
937 * behalf of mountd are passed a single client name to use, and should
938 * use exp_get_by_name() or exp_find().
939 */
940struct svc_export *
941rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
942{
943 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
944 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
945 struct cache_detail *cd = nn->svc_export_cache;
946
947 if (rqstp->rq_client == NULL)
948 goto gss;
949
950 /* First try the auth_unix client: */
951 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
952 if (PTR_ERR(exp) == -ENOENT)
953 goto gss;
954 if (IS_ERR(exp))
955 return exp;
956 /* If it has secinfo, assume there are no gss/... clients */
957 if (exp->ex_nflavors > 0)
958 return exp;
959gss:
960 /* Otherwise, try falling back on gss client */
961 if (rqstp->rq_gssclient == NULL)
962 return exp;
963 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
964 if (PTR_ERR(gssexp) == -ENOENT)
965 return exp;
966 if (!IS_ERR(exp))
967 exp_put(exp);
968 return gssexp;
969}
970
971struct svc_export *
972rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
973{
974 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
975 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
976 struct cache_detail *cd = nn->svc_export_cache;
977
978 if (rqstp->rq_client == NULL)
979 goto gss;
980
981 /* First try the auth_unix client: */
982 exp = exp_find(cd, rqstp->rq_client, fsid_type,
983 fsidv, &rqstp->rq_chandle);
984 if (PTR_ERR(exp) == -ENOENT)
985 goto gss;
986 if (IS_ERR(exp))
987 return exp;
988 /* If it has secinfo, assume there are no gss/... clients */
989 if (exp->ex_nflavors > 0)
990 return exp;
991gss:
992 /* Otherwise, try falling back on gss client */
993 if (rqstp->rq_gssclient == NULL)
994 return exp;
995 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
996 &rqstp->rq_chandle);
997 if (PTR_ERR(gssexp) == -ENOENT)
998 return exp;
999 if (!IS_ERR(exp))
1000 exp_put(exp);
1001 return gssexp;
1002}
1003
1004struct svc_export *
1005rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1006{
1007 struct dentry *saved = dget(path->dentry);
1008 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1009
1010 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1011 struct dentry *parent = dget_parent(path->dentry);
1012 dput(path->dentry);
1013 path->dentry = parent;
1014 exp = rqst_exp_get_by_name(rqstp, path);
1015 }
1016 dput(path->dentry);
1017 path->dentry = saved;
1018 return exp;
1019}
1020
1021struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1022{
1023 u32 fsidv[2];
1024
1025 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1026
1027 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1028}
1029
1030/*
1031 * Called when we need the filehandle for the root of the pseudofs,
1032 * for a given NFSv4 client. The root is defined to be the
1033 * export point with fsid==0
1034 */
1035__be32
1036exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1037{
1038 struct svc_export *exp;
1039 __be32 rv;
1040
1041 exp = rqst_find_fsidzero_export(rqstp);
1042 if (IS_ERR(exp))
1043 return nfserrno(PTR_ERR(exp));
1044 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1045 exp_put(exp);
1046 return rv;
1047}
1048
1049/* Iterator */
1050
1051static void *e_start(struct seq_file *m, loff_t *pos)
1052 __acquires(((struct cache_detail *)m->private)->hash_lock)
1053{
1054 loff_t n = *pos;
1055 unsigned hash, export;
1056 struct cache_head *ch;
1057 struct cache_detail *cd = m->private;
1058 struct cache_head **export_table = cd->hash_table;
1059
1060 read_lock(&cd->hash_lock);
1061 if (!n--)
1062 return SEQ_START_TOKEN;
1063 hash = n >> 32;
1064 export = n & ((1LL<<32) - 1);
1065
1066
1067 for (ch=export_table[hash]; ch; ch=ch->next)
1068 if (!export--)
1069 return ch;
1070 n &= ~((1LL<<32) - 1);
1071 do {
1072 hash++;
1073 n += 1LL<<32;
1074 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1075 if (hash >= EXPORT_HASHMAX)
1076 return NULL;
1077 *pos = n+1;
1078 return export_table[hash];
1079}
1080
1081static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1082{
1083 struct cache_head *ch = p;
1084 int hash = (*pos >> 32);
1085 struct cache_detail *cd = m->private;
1086 struct cache_head **export_table = cd->hash_table;
1087
1088 if (p == SEQ_START_TOKEN)
1089 hash = 0;
1090 else if (ch->next == NULL) {
1091 hash++;
1092 *pos += 1LL<<32;
1093 } else {
1094 ++*pos;
1095 return ch->next;
1096 }
1097 *pos &= ~((1LL<<32) - 1);
1098 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1099 hash++;
1100 *pos += 1LL<<32;
1101 }
1102 if (hash >= EXPORT_HASHMAX)
1103 return NULL;
1104 ++*pos;
1105 return export_table[hash];
1106}
1107
1108static void e_stop(struct seq_file *m, void *p)
1109 __releases(((struct cache_detail *)m->private)->hash_lock)
1110{
1111 struct cache_detail *cd = m->private;
1112
1113 read_unlock(&cd->hash_lock);
1114}
1115
1116static struct flags {
1117 int flag;
1118 char *name[2];
1119} expflags[] = {
1120 { NFSEXP_READONLY, {"ro", "rw"}},
1121 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1122 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1123 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1124 { NFSEXP_ASYNC, {"async", "sync"}},
1125 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1126 { NFSEXP_NOHIDE, {"nohide", ""}},
1127 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1128 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1129 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1130 { NFSEXP_V4ROOT, {"v4root", ""}},
1131 { 0, {"", ""}}
1132};
1133
1134static void show_expflags(struct seq_file *m, int flags, int mask)
1135{
1136 struct flags *flg;
1137 int state, first = 0;
1138
1139 for (flg = expflags; flg->flag; flg++) {
1140 if (flg->flag & ~mask)
1141 continue;
1142 state = (flg->flag & flags) ? 0 : 1;
1143 if (*flg->name[state])
1144 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1145 }
1146}
1147
1148static void show_secinfo_flags(struct seq_file *m, int flags)
1149{
1150 seq_printf(m, ",");
1151 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1152}
1153
1154static bool secinfo_flags_equal(int f, int g)
1155{
1156 f &= NFSEXP_SECINFO_FLAGS;
1157 g &= NFSEXP_SECINFO_FLAGS;
1158 return f == g;
1159}
1160
1161static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1162{
1163 int flags;
1164
1165 flags = (*fp)->flags;
1166 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1167 (*fp)++;
1168 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1169 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1170 (*fp)++;
1171 }
1172 return flags;
1173}
1174
1175static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1176{
1177 struct exp_flavor_info *f;
1178 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1179 int flags;
1180
1181 if (exp->ex_nflavors == 0)
1182 return;
1183 f = exp->ex_flavors;
1184 flags = show_secinfo_run(m, &f, end);
1185 if (!secinfo_flags_equal(flags, exp->ex_flags))
1186 show_secinfo_flags(m, flags);
1187 while (f != end) {
1188 flags = show_secinfo_run(m, &f, end);
1189 show_secinfo_flags(m, flags);
1190 }
1191}
1192
1193static void exp_flags(struct seq_file *m, int flag, int fsid,
1194 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1195{
1196 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1197 if (flag & NFSEXP_FSID)
1198 seq_printf(m, ",fsid=%d", fsid);
1199 if (!uid_eq(anonu, make_kuid(&init_user_ns, (uid_t)-2)) &&
1200 !uid_eq(anonu, make_kuid(&init_user_ns, 0x10000-2)))
1201 seq_printf(m, ",anonuid=%u", from_kuid(&init_user_ns, anonu));
1202 if (!gid_eq(anong, make_kgid(&init_user_ns, (gid_t)-2)) &&
1203 !gid_eq(anong, make_kgid(&init_user_ns, 0x10000-2)))
1204 seq_printf(m, ",anongid=%u", from_kgid(&init_user_ns, anong));
1205 if (fsloc && fsloc->locations_count > 0) {
1206 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1207 int i;
1208
1209 seq_printf(m, ",%s=", loctype);
1210 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1211 seq_putc(m, '@');
1212 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1213 for (i = 1; i < fsloc->locations_count; i++) {
1214 seq_putc(m, ';');
1215 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1216 seq_putc(m, '@');
1217 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1218 }
1219 }
1220}
1221
1222static int e_show(struct seq_file *m, void *p)
1223{
1224 struct cache_head *cp = p;
1225 struct svc_export *exp = container_of(cp, struct svc_export, h);
1226 struct cache_detail *cd = m->private;
1227
1228 if (p == SEQ_START_TOKEN) {
1229 seq_puts(m, "# Version 1.1\n");
1230 seq_puts(m, "# Path Client(Flags) # IPs\n");
1231 return 0;
1232 }
1233
1234 cache_get(&exp->h);
1235 if (cache_check(cd, &exp->h, NULL))
1236 return 0;
1237 exp_put(exp);
1238 return svc_export_show(m, cd, cp);
1239}
1240
1241const struct seq_operations nfs_exports_op = {
1242 .start = e_start,
1243 .next = e_next,
1244 .stop = e_stop,
1245 .show = e_show,
1246};
1247
1248/*
1249 * Initialize the exports module.
1250 */
1251int
1252nfsd_export_init(struct net *net)
1253{
1254 int rv;
1255 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1256
1257 dprintk("nfsd: initializing export module (net: %p).\n", net);
1258
1259 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1260 if (IS_ERR(nn->svc_export_cache))
1261 return PTR_ERR(nn->svc_export_cache);
1262 rv = cache_register_net(nn->svc_export_cache, net);
1263 if (rv)
1264 goto destroy_export_cache;
1265
1266 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1267 if (IS_ERR(nn->svc_expkey_cache)) {
1268 rv = PTR_ERR(nn->svc_expkey_cache);
1269 goto unregister_export_cache;
1270 }
1271 rv = cache_register_net(nn->svc_expkey_cache, net);
1272 if (rv)
1273 goto destroy_expkey_cache;
1274 return 0;
1275
1276destroy_expkey_cache:
1277 cache_destroy_net(nn->svc_expkey_cache, net);
1278unregister_export_cache:
1279 cache_unregister_net(nn->svc_export_cache, net);
1280destroy_export_cache:
1281 cache_destroy_net(nn->svc_export_cache, net);
1282 return rv;
1283}
1284
1285/*
1286 * Flush exports table - called when last nfsd thread is killed
1287 */
1288void
1289nfsd_export_flush(struct net *net)
1290{
1291 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1292
1293 cache_purge(nn->svc_expkey_cache);
1294 cache_purge(nn->svc_export_cache);
1295}
1296
1297/*
1298 * Shutdown the exports module.
1299 */
1300void
1301nfsd_export_shutdown(struct net *net)
1302{
1303 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1304
1305 dprintk("nfsd: shutting down export module (net: %p).\n", net);
1306
1307 cache_unregister_net(nn->svc_expkey_cache, net);
1308 cache_unregister_net(nn->svc_export_cache, net);
1309 cache_destroy_net(nn->svc_expkey_cache, net);
1310 cache_destroy_net(nn->svc_export_cache, net);
1311 svcauth_unix_purge(net);
1312
1313 dprintk("nfsd: export shutdown complete (net: %p).\n", net);
1314}