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12#include <linux/slab.h>
13#include <linux/fs.h>
14#include <linux/unistd.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/dcache.h>
18#include <linux/exportfs.h>
19#include <linux/mount.h>
20
21#include <linux/sunrpc/clnt.h>
22#include <linux/sunrpc/svc.h>
23#include <linux/sunrpc/svcauth_gss.h>
24#include <linux/nfsd/nfsd.h>
25#include "auth.h"
26
27#define NFSDDBG_FACILITY NFSDDBG_FH
28
29
30
31
32
33
34
35
36static int nfsd_acceptable(void *expv, struct dentry *dentry)
37{
38 struct svc_export *exp = expv;
39 int rv;
40 struct dentry *tdentry;
41 struct dentry *parent;
42
43 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
44 return 1;
45
46 tdentry = dget(dentry);
47 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
48
49 int err;
50 parent = dget_parent(tdentry);
51 err = inode_permission(parent->d_inode, MAY_EXEC);
52 if (err < 0) {
53 dput(parent);
54 break;
55 }
56 dput(tdentry);
57 tdentry = parent;
58 }
59 if (tdentry != exp->ex_path.dentry)
60 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
61 rv = (tdentry == exp->ex_path.dentry);
62 dput(tdentry);
63 return rv;
64}
65
66
67
68
69
70
71static inline __be32
72nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
73{
74
75 if (type > 0 && (mode & S_IFMT) != type) {
76 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
77 return nfserr_symlink;
78 else if (type == S_IFDIR)
79 return nfserr_notdir;
80 else if ((mode & S_IFMT) == S_IFDIR)
81 return nfserr_isdir;
82 else
83 return nfserr_inval;
84 }
85 if (type < 0 && (mode & S_IFMT) == -type) {
86 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
87 return nfserr_symlink;
88 else if (type == -S_IFDIR)
89 return nfserr_isdir;
90 else
91 return nfserr_notdir;
92 }
93 return 0;
94}
95
96static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
97 struct svc_export *exp)
98{
99
100 if (!rqstp->rq_secure && EX_SECURE(exp)) {
101 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
102 dprintk(KERN_WARNING
103 "nfsd: request from insecure port %s!\n",
104 svc_print_addr(rqstp, buf, sizeof(buf)));
105 return nfserr_perm;
106 }
107
108
109 return nfserrno(nfsd_setuser(rqstp, exp));
110}
111
112
113
114
115
116
117static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
118{
119 struct knfsd_fh *fh = &fhp->fh_handle;
120 struct fid *fid = NULL, sfid;
121 struct svc_export *exp;
122 struct dentry *dentry;
123 int fileid_type;
124 int data_left = fh->fh_size/4;
125 __be32 error;
126
127 error = nfserr_stale;
128 if (rqstp->rq_vers > 2)
129 error = nfserr_badhandle;
130 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
131 return nfserr_nofilehandle;
132
133 if (fh->fh_version == 1) {
134 int len;
135
136 if (--data_left < 0)
137 return error;
138 if (fh->fh_auth_type != 0)
139 return error;
140 len = key_len(fh->fh_fsid_type) / 4;
141 if (len == 0)
142 return error;
143 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
144
145 len = key_len(FSID_ENCODE_DEV)/4;
146 fh->fh_fsid_type = FSID_ENCODE_DEV;
147 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
148 fh->fh_fsid[1] = fh->fh_fsid[2];
149 }
150 data_left -= len;
151 if (data_left < 0)
152 return error;
153 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
154 fid = (struct fid *)(fh->fh_auth + len);
155 } else {
156 __u32 tfh[2];
157 dev_t xdev;
158 ino_t xino;
159
160 if (fh->fh_size != NFS_FHSIZE)
161 return error;
162
163 xdev = old_decode_dev(fh->ofh_xdev);
164 xino = u32_to_ino_t(fh->ofh_xino);
165 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
166 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
167 }
168
169 error = nfserr_stale;
170 if (PTR_ERR(exp) == -ENOENT)
171 return error;
172
173 if (IS_ERR(exp))
174 return nfserrno(PTR_ERR(exp));
175
176 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
177
178
179
180
181
182
183
184
185
186 struct cred *new = prepare_creds();
187 if (!new)
188 return nfserrno(-ENOMEM);
189 new->cap_effective =
190 cap_raise_nfsd_set(new->cap_effective,
191 new->cap_permitted);
192 put_cred(override_creds(new));
193 put_cred(new);
194 } else {
195 error = nfsd_setuser_and_check_port(rqstp, exp);
196 if (error)
197 goto out;
198 }
199
200
201
202
203 error = nfserr_stale;
204 if (rqstp->rq_vers > 2)
205 error = nfserr_badhandle;
206
207 if (fh->fh_version != 1) {
208 sfid.i32.ino = fh->ofh_ino;
209 sfid.i32.gen = fh->ofh_generation;
210 sfid.i32.parent_ino = fh->ofh_dirino;
211 fid = &sfid;
212 data_left = 3;
213 if (fh->ofh_dirino == 0)
214 fileid_type = FILEID_INO32_GEN;
215 else
216 fileid_type = FILEID_INO32_GEN_PARENT;
217 } else
218 fileid_type = fh->fh_fileid_type;
219
220 if (fileid_type == FILEID_ROOT)
221 dentry = dget(exp->ex_path.dentry);
222 else {
223 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
224 data_left, fileid_type,
225 nfsd_acceptable, exp);
226 }
227 if (dentry == NULL)
228 goto out;
229 if (IS_ERR(dentry)) {
230 if (PTR_ERR(dentry) != -EINVAL)
231 error = nfserrno(PTR_ERR(dentry));
232 goto out;
233 }
234
235 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
236 error = nfsd_setuser_and_check_port(rqstp, exp);
237 if (error) {
238 dput(dentry);
239 goto out;
240 }
241 }
242
243 if (S_ISDIR(dentry->d_inode->i_mode) &&
244 (dentry->d_flags & DCACHE_DISCONNECTED)) {
245 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
246 dentry->d_parent->d_name.name, dentry->d_name.name);
247 }
248
249 fhp->fh_dentry = dentry;
250 fhp->fh_export = exp;
251 return 0;
252out:
253 exp_put(exp);
254 return error;
255}
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283
284__be32
285fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
286{
287 struct svc_export *exp;
288 struct dentry *dentry;
289 __be32 error;
290
291 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
292
293 if (!fhp->fh_dentry) {
294 error = nfsd_set_fh_dentry(rqstp, fhp);
295 if (error)
296 goto out;
297 dentry = fhp->fh_dentry;
298 exp = fhp->fh_export;
299 } else {
300
301
302
303
304
305 dprintk("nfsd: fh_verify - just checking\n");
306 dentry = fhp->fh_dentry;
307 exp = fhp->fh_export;
308
309
310
311
312
313
314
315 error = nfsd_setuser_and_check_port(rqstp, exp);
316 if (error)
317 goto out;
318 }
319
320 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
321 if (error)
322 goto out;
323
324
325
326
327
328
329 if (access & NFSD_MAY_LOCK)
330 goto skip_pseudoflavor_check;
331
332
333
334
335
336 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
337 && exp->ex_path.dentry == dentry)
338 goto skip_pseudoflavor_check;
339
340 error = check_nfsd_access(exp, rqstp);
341 if (error)
342 goto out;
343
344skip_pseudoflavor_check:
345
346 error = nfsd_permission(rqstp, exp, dentry, access);
347
348 if (error) {
349 dprintk("fh_verify: %s/%s permission failure, "
350 "acc=%x, error=%d\n",
351 dentry->d_parent->d_name.name,
352 dentry->d_name.name,
353 access, ntohl(error));
354 }
355out:
356 if (error == nfserr_stale)
357 nfsdstats.fh_stale++;
358 return error;
359}
360
361
362
363
364
365
366
367
368
369static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
370 struct dentry *dentry)
371{
372 if (dentry != exp->ex_path.dentry) {
373 struct fid *fid = (struct fid *)
374 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
375 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
376 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
377
378 fhp->fh_handle.fh_fileid_type =
379 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
380 fhp->fh_handle.fh_size += maxsize * 4;
381 } else {
382 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
383 }
384}
385
386
387
388
389static inline void _fh_update_old(struct dentry *dentry,
390 struct svc_export *exp,
391 struct knfsd_fh *fh)
392{
393 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
394 fh->ofh_generation = dentry->d_inode->i_generation;
395 if (S_ISDIR(dentry->d_inode->i_mode) ||
396 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
397 fh->ofh_dirino = 0;
398}
399
400static bool is_root_export(struct svc_export *exp)
401{
402 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
403}
404
405static struct super_block *exp_sb(struct svc_export *exp)
406{
407 return exp->ex_path.dentry->d_inode->i_sb;
408}
409
410static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
411{
412 switch (fsid_type) {
413 case FSID_DEV:
414 if (!old_valid_dev(exp_sb(exp)->s_dev))
415 return 0;
416
417 case FSID_MAJOR_MINOR:
418 case FSID_ENCODE_DEV:
419 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
420 case FSID_NUM:
421 return exp->ex_flags & NFSEXP_FSID;
422 case FSID_UUID8:
423 case FSID_UUID16:
424 if (!is_root_export(exp))
425 return 0;
426
427 case FSID_UUID4_INUM:
428 case FSID_UUID16_INUM:
429 return exp->ex_uuid != NULL;
430 }
431 return 1;
432}
433
434
435static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
436{
437 u8 version;
438 u8 fsid_type;
439retry:
440 version = 1;
441 if (ref_fh && ref_fh->fh_export == exp) {
442 version = ref_fh->fh_handle.fh_version;
443 fsid_type = ref_fh->fh_handle.fh_fsid_type;
444
445 ref_fh = NULL;
446
447 switch (version) {
448 case 0xca:
449 fsid_type = FSID_DEV;
450 break;
451 case 1:
452 break;
453 default:
454 goto retry;
455 }
456
457
458
459
460
461
462
463 if (!fsid_type_ok_for_exp(fsid_type, exp))
464 goto retry;
465 } else if (exp->ex_flags & NFSEXP_FSID) {
466 fsid_type = FSID_NUM;
467 } else if (exp->ex_uuid) {
468 if (fhp->fh_maxsize >= 64) {
469 if (is_root_export(exp))
470 fsid_type = FSID_UUID16;
471 else
472 fsid_type = FSID_UUID16_INUM;
473 } else {
474 if (is_root_export(exp))
475 fsid_type = FSID_UUID8;
476 else
477 fsid_type = FSID_UUID4_INUM;
478 }
479 } else if (!old_valid_dev(exp_sb(exp)->s_dev))
480
481 fsid_type = FSID_ENCODE_DEV;
482 else
483 fsid_type = FSID_DEV;
484 fhp->fh_handle.fh_version = version;
485 if (version)
486 fhp->fh_handle.fh_fsid_type = fsid_type;
487}
488
489__be32
490fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
491 struct svc_fh *ref_fh)
492{
493
494
495
496
497
498
499
500
501 struct inode * inode = dentry->d_inode;
502 struct dentry *parent = dentry->d_parent;
503 __u32 *datap;
504 dev_t ex_dev = exp_sb(exp)->s_dev;
505
506 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
507 MAJOR(ex_dev), MINOR(ex_dev),
508 (long) exp->ex_path.dentry->d_inode->i_ino,
509 parent->d_name.name, dentry->d_name.name,
510 (inode ? inode->i_ino : 0));
511
512
513
514
515
516 set_version_and_fsid_type(fhp, exp, ref_fh);
517
518 if (ref_fh == fhp)
519 fh_put(ref_fh);
520
521 if (fhp->fh_locked || fhp->fh_dentry) {
522 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
523 parent->d_name.name, dentry->d_name.name);
524 }
525 if (fhp->fh_maxsize < NFS_FHSIZE)
526 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
527 fhp->fh_maxsize,
528 parent->d_name.name, dentry->d_name.name);
529
530 fhp->fh_dentry = dget(dentry);
531 fhp->fh_export = exp;
532 cache_get(&exp->h);
533
534 if (fhp->fh_handle.fh_version == 0xca) {
535
536 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
537 fhp->fh_handle.fh_size = NFS_FHSIZE;
538 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
539 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
540 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
541 fhp->fh_handle.ofh_xino =
542 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
543 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
544 if (inode)
545 _fh_update_old(dentry, exp, &fhp->fh_handle);
546 } else {
547 int len;
548 fhp->fh_handle.fh_auth_type = 0;
549 datap = fhp->fh_handle.fh_auth+0;
550 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
551 exp->ex_path.dentry->d_inode->i_ino,
552 exp->ex_fsid, exp->ex_uuid);
553
554 len = key_len(fhp->fh_handle.fh_fsid_type);
555 datap += len/4;
556 fhp->fh_handle.fh_size = 4 + len;
557
558 if (inode)
559 _fh_update(fhp, exp, dentry);
560 if (fhp->fh_handle.fh_fileid_type == 255) {
561 fh_put(fhp);
562 return nfserr_opnotsupp;
563 }
564 }
565
566 return 0;
567}
568
569
570
571
572
573__be32
574fh_update(struct svc_fh *fhp)
575{
576 struct dentry *dentry;
577
578 if (!fhp->fh_dentry)
579 goto out_bad;
580
581 dentry = fhp->fh_dentry;
582 if (!dentry->d_inode)
583 goto out_negative;
584 if (fhp->fh_handle.fh_version != 1) {
585 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
586 } else {
587 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
588 goto out;
589
590 _fh_update(fhp, fhp->fh_export, dentry);
591 if (fhp->fh_handle.fh_fileid_type == 255)
592 return nfserr_opnotsupp;
593 }
594out:
595 return 0;
596
597out_bad:
598 printk(KERN_ERR "fh_update: fh not verified!\n");
599 goto out;
600out_negative:
601 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
602 dentry->d_parent->d_name.name, dentry->d_name.name);
603 goto out;
604}
605
606
607
608
609void
610fh_put(struct svc_fh *fhp)
611{
612 struct dentry * dentry = fhp->fh_dentry;
613 struct svc_export * exp = fhp->fh_export;
614 if (dentry) {
615 fh_unlock(fhp);
616 fhp->fh_dentry = NULL;
617 dput(dentry);
618#ifdef CONFIG_NFSD_V3
619 fhp->fh_pre_saved = 0;
620 fhp->fh_post_saved = 0;
621#endif
622 }
623 if (exp) {
624 cache_put(&exp->h, &svc_export_cache);
625 fhp->fh_export = NULL;
626 }
627 return;
628}
629
630
631
632
633char * SVCFH_fmt(struct svc_fh *fhp)
634{
635 struct knfsd_fh *fh = &fhp->fh_handle;
636
637 static char buf[80];
638 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
639 fh->fh_size,
640 fh->fh_base.fh_pad[0],
641 fh->fh_base.fh_pad[1],
642 fh->fh_base.fh_pad[2],
643 fh->fh_base.fh_pad[3],
644 fh->fh_base.fh_pad[4],
645 fh->fh_base.fh_pad[5]);
646 return buf;
647}
648
649enum fsid_source fsid_source(struct svc_fh *fhp)
650{
651 if (fhp->fh_handle.fh_version != 1)
652 return FSIDSOURCE_DEV;
653 switch(fhp->fh_handle.fh_fsid_type) {
654 case FSID_DEV:
655 case FSID_ENCODE_DEV:
656 case FSID_MAJOR_MINOR:
657 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
658 return FSIDSOURCE_DEV;
659 break;
660 case FSID_NUM:
661 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
662 return FSIDSOURCE_FSID;
663 break;
664 default:
665 break;
666 }
667
668
669
670 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
671 return FSIDSOURCE_FSID;
672 if (fhp->fh_export->ex_uuid)
673 return FSIDSOURCE_UUID;
674 return FSIDSOURCE_DEV;
675}
676