1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * XDR support for nfsd/protocol version 3.
4 *
5 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
6 *
7 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
8 */
9
10 #include <linux/namei.h>
11 #include <linux/sunrpc/svc_xprt.h>
12 #include "xdr3.h"
13 #include "auth.h"
14 #include "netns.h"
15 #include "vfs.h"
16
17 /*
18 * Force construction of an empty post-op attr
19 */
20 static const struct svc_fh nfs3svc_null_fh = {
21 .fh_no_wcc = true,
22 };
23
24 /*
25 * time_delta. {1, 0} means the server is accurate only
26 * to the nearest second.
27 */
28 static const struct timespec64 nfs3svc_time_delta = {
29 .tv_sec = 1,
30 .tv_nsec = 0,
31 };
32
33 /*
34 * Mapping of S_IF* types to NFS file types
35 */
36 static const u32 nfs3_ftypes[] = {
37 NF3NON, NF3FIFO, NF3CHR, NF3BAD,
38 NF3DIR, NF3BAD, NF3BLK, NF3BAD,
39 NF3REG, NF3BAD, NF3LNK, NF3BAD,
40 NF3SOCK, NF3BAD, NF3LNK, NF3BAD,
41 };
42
43
44 /*
45 * Basic NFSv3 data types (RFC 1813 Sections 2.5 and 2.6)
46 */
47
48 static __be32 *
49 encode_nfstime3(__be32 *p, const struct timespec64 *time)
50 {
51 *p++ = cpu_to_be32((u32)time->tv_sec);
52 *p++ = cpu_to_be32(time->tv_nsec);
53
54 return p;
55 }
56
57 static bool
58 svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep)
59 {
60 __be32 *p;
61
62 p = xdr_inline_decode(xdr, XDR_UNIT * 2);
63 if (!p)
64 return false;
65 timep->tv_sec = be32_to_cpup(p++);
66 timep->tv_nsec = be32_to_cpup(p);
67
68 return true;
69 }
70
71 /**
72 * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle
73 * @xdr: XDR stream positioned at an undecoded NFSv3 FH
74 * @fhp: OUT: filled-in server file handle
75 *
76 * Return values:
77 * %false: The encoded file handle was not valid
78 * %true: @fhp has been initialized
79 */
80 bool
81 svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp)
82 {
83 __be32 *p;
84 u32 size;
85
86 if (xdr_stream_decode_u32(xdr, &size) < 0)
87 return false;
88 if (size == 0 || size > NFS3_FHSIZE)
89 return false;
90 p = xdr_inline_decode(xdr, size);
91 if (!p)
92 return false;
93 fh_init(fhp, NFS3_FHSIZE);
94 fhp->fh_handle.fh_size = size;
95 memcpy(&fhp->fh_handle.fh_raw, p, size);
96
97 return true;
98 }
99
100 /**
101 * svcxdr_encode_nfsstat3 - Encode an NFSv3 status code
102 * @xdr: XDR stream
103 * @status: status value to encode
104 *
105 * Return values:
106 * %false: Send buffer space was exhausted
107 * %true: Success
108 */
109 bool
110 svcxdr_encode_nfsstat3(struct xdr_stream *xdr, __be32 status)
111 {
112 __be32 *p;
113
114 p = xdr_reserve_space(xdr, sizeof(status));
115 if (!p)
116 return false;
117 *p = status;
118
119 return true;
120 }
121
122 static bool
123 svcxdr_encode_nfs_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
124 {
125 u32 size = fhp->fh_handle.fh_size;
126 __be32 *p;
127
128 p = xdr_reserve_space(xdr, XDR_UNIT + size);
129 if (!p)
130 return false;
131 *p++ = cpu_to_be32(size);
132 if (size)
133 p[XDR_QUADLEN(size) - 1] = 0;
134 memcpy(p, &fhp->fh_handle.fh_raw, size);
135
136 return true;
137 }
138
139 static bool
140 svcxdr_encode_post_op_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp)
141 {
142 if (xdr_stream_encode_item_present(xdr) < 0)
143 return false;
144 if (!svcxdr_encode_nfs_fh3(xdr, fhp))
145 return false;
146
147 return true;
148 }
149
150 static bool
151 svcxdr_encode_cookieverf3(struct xdr_stream *xdr, const __be32 *verf)
152 {
153 __be32 *p;
154
155 p = xdr_reserve_space(xdr, NFS3_COOKIEVERFSIZE);
156 if (!p)
157 return false;
158 memcpy(p, verf, NFS3_COOKIEVERFSIZE);
159
160 return true;
161 }
162
163 static bool
164 svcxdr_encode_writeverf3(struct xdr_stream *xdr, const __be32 *verf)
165 {
166 __be32 *p;
167
168 p = xdr_reserve_space(xdr, NFS3_WRITEVERFSIZE);
169 if (!p)
170 return false;
171 memcpy(p, verf, NFS3_WRITEVERFSIZE);
172
173 return true;
174 }
175
176 static bool
177 svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len)
178 {
179 u32 size, i;
180 __be32 *p;
181 char *c;
182
183 if (xdr_stream_decode_u32(xdr, &size) < 0)
184 return false;
185 if (size == 0 || size > NFS3_MAXNAMLEN)
186 return false;
187 p = xdr_inline_decode(xdr, size);
188 if (!p)
189 return false;
190
191 *len = size;
192 *name = (char *)p;
193 for (i = 0, c = *name; i < size; i++, c++) {
194 if (*c == '\0' || *c == '/')
195 return false;
196 }
197
198 return true;
199 }
200
201 static bool
202 svcxdr_decode_diropargs3(struct xdr_stream *xdr, struct svc_fh *fhp,
203 char **name, unsigned int *len)
204 {
205 return svcxdr_decode_nfs_fh3(xdr, fhp) &&
206 svcxdr_decode_filename3(xdr, name, len);
207 }
208
209 static bool
210 svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
211 struct iattr *iap)
212 {
213 u32 set_it;
214
215 iap->ia_valid = 0;
216
217 if (xdr_stream_decode_bool(xdr, &set_it) < 0)
218 return false;
219 if (set_it) {
220 u32 mode;
221
222 if (xdr_stream_decode_u32(xdr, &mode) < 0)
223 return false;
224 iap->ia_valid |= ATTR_MODE;
225 iap->ia_mode = mode;
226 }
227 if (xdr_stream_decode_bool(xdr, &set_it) < 0)
228 return false;
229 if (set_it) {
230 u32 uid;
231
232 if (xdr_stream_decode_u32(xdr, &uid) < 0)
233 return false;
234 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), uid);
235 if (uid_valid(iap->ia_uid))
236 iap->ia_valid |= ATTR_UID;
237 }
238 if (xdr_stream_decode_bool(xdr, &set_it) < 0)
239 return false;
240 if (set_it) {
241 u32 gid;
242
243 if (xdr_stream_decode_u32(xdr, &gid) < 0)
244 return false;
245 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), gid);
246 if (gid_valid(iap->ia_gid))
247 iap->ia_valid |= ATTR_GID;
248 }
249 if (xdr_stream_decode_bool(xdr, &set_it) < 0)
250 return false;
251 if (set_it) {
252 u64 newsize;
253
254 if (xdr_stream_decode_u64(xdr, &newsize) < 0)
255 return false;
256 iap->ia_valid |= ATTR_SIZE;
257 iap->ia_size = newsize;
258 }
259 if (xdr_stream_decode_u32(xdr, &set_it) < 0)
260 return false;
261 switch (set_it) {
262 case DONT_CHANGE:
263 break;
264 case SET_TO_SERVER_TIME:
265 iap->ia_valid |= ATTR_ATIME;
266 break;
267 case SET_TO_CLIENT_TIME:
268 if (!svcxdr_decode_nfstime3(xdr, &iap->ia_atime))
269 return false;
270 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
271 break;
272 default:
273 return false;
274 }
275 if (xdr_stream_decode_u32(xdr, &set_it) < 0)
276 return false;
277 switch (set_it) {
278 case DONT_CHANGE:
279 break;
280 case SET_TO_SERVER_TIME:
281 iap->ia_valid |= ATTR_MTIME;
282 break;
283 case SET_TO_CLIENT_TIME:
284 if (!svcxdr_decode_nfstime3(xdr, &iap->ia_mtime))
285 return false;
286 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
287 break;
288 default:
289 return false;
290 }
291
292 return true;
293 }
294
295 static bool
296 svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
297 {
298 u32 check;
299
300 if (xdr_stream_decode_bool(xdr, &check) < 0)
301 return false;
302 if (check) {
303 if (!svcxdr_decode_nfstime3(xdr, &args->guardtime))
304 return false;
305 args->check_guard = 1;
306 } else
307 args->check_guard = 0;
308
309 return true;
310 }
311
312 static bool
313 svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
314 {
315 __be32 *p;
316
317 p = xdr_inline_decode(xdr, XDR_UNIT * 2);
318 if (!p)
319 return false;
320 args->major = be32_to_cpup(p++);
321 args->minor = be32_to_cpup(p);
322
323 return true;
324 }
325
326 static bool
327 svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
328 struct nfsd3_mknodargs *args)
329 {
330 return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
331 svcxdr_decode_specdata3(xdr, args);
332 }
333
334 static bool
335 svcxdr_encode_fattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
336 const struct svc_fh *fhp, const struct kstat *stat)
337 {
338 struct user_namespace *userns = nfsd_user_namespace(rqstp);
339 __be32 *p;
340 u64 fsid;
341
342 p = xdr_reserve_space(xdr, XDR_UNIT * 21);
343 if (!p)
344 return false;
345
346 *p++ = cpu_to_be32(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
347 *p++ = cpu_to_be32((u32)(stat->mode & S_IALLUGO));
348 *p++ = cpu_to_be32((u32)stat->nlink);
349 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
350 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
351 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN)
352 p = xdr_encode_hyper(p, (u64)NFS3_MAXPATHLEN);
353 else
354 p = xdr_encode_hyper(p, (u64)stat->size);
355
356 /* used */
357 p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
358
359 /* rdev */
360 *p++ = cpu_to_be32((u32)MAJOR(stat->rdev));
361 *p++ = cpu_to_be32((u32)MINOR(stat->rdev));
362
363 switch(fsid_source(fhp)) {
364 case FSIDSOURCE_FSID:
365 fsid = (u64)fhp->fh_export->ex_fsid;
366 break;
367 case FSIDSOURCE_UUID:
368 fsid = ((u64 *)fhp->fh_export->ex_uuid)[0];
369 fsid ^= ((u64 *)fhp->fh_export->ex_uuid)[1];
370 break;
371 default:
372 fsid = (u64)huge_encode_dev(fhp->fh_dentry->d_sb->s_dev);
373 }
374 p = xdr_encode_hyper(p, fsid);
375
376 /* fileid */
377 p = xdr_encode_hyper(p, stat->ino);
378
379 p = encode_nfstime3(p, &stat->atime);
380 p = encode_nfstime3(p, &stat->mtime);
381 encode_nfstime3(p, &stat->ctime);
382
383 return true;
384 }
385
386 static bool
387 svcxdr_encode_wcc_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
388 {
389 __be32 *p;
390
391 p = xdr_reserve_space(xdr, XDR_UNIT * 6);
392 if (!p)
393 return false;
394 p = xdr_encode_hyper(p, (u64)fhp->fh_pre_size);
395 p = encode_nfstime3(p, &fhp->fh_pre_mtime);
396 encode_nfstime3(p, &fhp->fh_pre_ctime);
397
398 return true;
399 }
400
401 static bool
402 svcxdr_encode_pre_op_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
403 {
404 if (!fhp->fh_pre_saved) {
405 if (xdr_stream_encode_item_absent(xdr) < 0)
406 return false;
407 return true;
408 }
409
410 if (xdr_stream_encode_item_present(xdr) < 0)
411 return false;
412 return svcxdr_encode_wcc_attr(xdr, fhp);
413 }
414
415 /**
416 * svcxdr_encode_post_op_attr - Encode NFSv3 post-op attributes
417 * @rqstp: Context of a completed RPC transaction
418 * @xdr: XDR stream
419 * @fhp: File handle to encode
420 *
421 * Return values:
422 * %false: Send buffer space was exhausted
423 * %true: Success
424 */
425 bool
426 svcxdr_encode_post_op_attr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
427 const struct svc_fh *fhp)
428 {
429 struct dentry *dentry = fhp->fh_dentry;
430 struct kstat stat;
431
432 /*
433 * The inode may be NULL if the call failed because of a
434 * stale file handle. In this case, no attributes are
435 * returned.
436 */
437 if (fhp->fh_no_wcc || !dentry || !d_really_is_positive(dentry))
438 goto no_post_op_attrs;
439 if (fh_getattr(fhp, &stat) != nfs_ok)
440 goto no_post_op_attrs;
441
442 if (xdr_stream_encode_item_present(xdr) < 0)
443 return false;
444 lease_get_mtime(d_inode(dentry), &stat.mtime);
445 if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &stat))
446 return false;
447
448 return true;
449
450 no_post_op_attrs:
451 return xdr_stream_encode_item_absent(xdr) > 0;
452 }
453
454 /*
455 * Encode weak cache consistency data
456 */
457 static bool
458 svcxdr_encode_wcc_data(struct svc_rqst *rqstp, struct xdr_stream *xdr,
459 const struct svc_fh *fhp)
460 {
461 struct dentry *dentry = fhp->fh_dentry;
462
463 if (!dentry || !d_really_is_positive(dentry) || !fhp->fh_post_saved)
464 goto neither;
465
466 /* before */
467 if (!svcxdr_encode_pre_op_attr(xdr, fhp))
468 return false;
469
470 /* after */
471 if (xdr_stream_encode_item_present(xdr) < 0)
472 return false;
473 if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &fhp->fh_post_attr))
474 return false;
475
476 return true;
477
478 neither:
479 if (xdr_stream_encode_item_absent(xdr) < 0)
480 return false;
481 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp))
482 return false;
483
484 return true;
485 }
486
487 /*
488 * XDR decode functions
489 */
490
491 bool
492 nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
493 {
494 struct nfsd_fhandle *args = rqstp->rq_argp;
495
496 return svcxdr_decode_nfs_fh3(xdr, &args->fh);
497 }
498
499 bool
500 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
501 {
502 struct nfsd3_sattrargs *args = rqstp->rq_argp;
503
504 return svcxdr_decode_nfs_fh3(xdr, &args->fh) &&
505 svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) &&
506 svcxdr_decode_sattrguard3(xdr, args);
507 }
508
509 bool
510 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
511 {
512 struct nfsd3_diropargs *args = rqstp->rq_argp;
513
514 return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len);
515 }
516
517 bool
518 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
519 {
520 struct nfsd3_accessargs *args = rqstp->rq_argp;
521
522 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
523 return false;
524 if (xdr_stream_decode_u32(xdr, &args->access) < 0)
525 return false;
526
527 return true;
528 }
529
530 bool
531 nfs3svc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
532 {
533 struct nfsd3_readargs *args = rqstp->rq_argp;
534
535 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
536 return false;
537 if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
538 return false;
539 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
540 return false;
541
542 return true;
543 }
544
545 bool
546 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
547 {
548 struct nfsd3_writeargs *args = rqstp->rq_argp;
549 u32 max_blocksize = svc_max_payload(rqstp);
550
551 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
552 return false;
553 if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
554 return false;
555 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
556 return false;
557 if (xdr_stream_decode_u32(xdr, &args->stable) < 0)
558 return false;
559
560 /* opaque data */
561 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
562 return false;
563
564 /* request sanity */
565 if (args->count != args->len)
566 return false;
567 if (args->count > max_blocksize) {
568 args->count = max_blocksize;
569 args->len = max_blocksize;
570 }
571
572 return xdr_stream_subsegment(xdr, &args->payload, args->count);
573 }
574
575 bool
576 nfs3svc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
577 {
578 struct nfsd3_createargs *args = rqstp->rq_argp;
579
580 if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
581 return false;
582 if (xdr_stream_decode_u32(xdr, &args->createmode) < 0)
583 return false;
584 switch (args->createmode) {
585 case NFS3_CREATE_UNCHECKED:
586 case NFS3_CREATE_GUARDED:
587 return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
588 case NFS3_CREATE_EXCLUSIVE:
589 args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
590 if (!args->verf)
591 return false;
592 break;
593 default:
594 return false;
595 }
596 return true;
597 }
598
599 bool
600 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
601 {
602 struct nfsd3_createargs *args = rqstp->rq_argp;
603
604 return svcxdr_decode_diropargs3(xdr, &args->fh,
605 &args->name, &args->len) &&
606 svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
607 }
608
609 bool
610 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
611 {
612 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
613 struct kvec *head = rqstp->rq_arg.head;
614
615 if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen))
616 return false;
617 if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs))
618 return false;
619 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
620 return false;
621
622 /* symlink_data */
623 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
624 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
625 return args->first.iov_base != NULL;
626 }
627
628 bool
629 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
630 {
631 struct nfsd3_mknodargs *args = rqstp->rq_argp;
632
633 if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len))
634 return false;
635 if (xdr_stream_decode_u32(xdr, &args->ftype) < 0)
636 return false;
637 switch (args->ftype) {
638 case NF3CHR:
639 case NF3BLK:
640 return svcxdr_decode_devicedata3(rqstp, xdr, args);
641 case NF3SOCK:
642 case NF3FIFO:
643 return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs);
644 case NF3REG:
645 case NF3DIR:
646 case NF3LNK:
647 /* Valid XDR but illegal file types */
648 break;
649 default:
650 return false;
651 }
652
653 return true;
654 }
655
656 bool
657 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
658 {
659 struct nfsd3_renameargs *args = rqstp->rq_argp;
660
661 return svcxdr_decode_diropargs3(xdr, &args->ffh,
662 &args->fname, &args->flen) &&
663 svcxdr_decode_diropargs3(xdr, &args->tfh,
664 &args->tname, &args->tlen);
665 }
666
667 bool
668 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
669 {
670 struct nfsd3_linkargs *args = rqstp->rq_argp;
671
672 return svcxdr_decode_nfs_fh3(xdr, &args->ffh) &&
673 svcxdr_decode_diropargs3(xdr, &args->tfh,
674 &args->tname, &args->tlen);
675 }
676
677 bool
678 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
679 {
680 struct nfsd3_readdirargs *args = rqstp->rq_argp;
681
682 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
683 return false;
684 if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
685 return false;
686 args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
687 if (!args->verf)
688 return false;
689 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
690 return false;
691
692 return true;
693 }
694
695 bool
696 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
697 {
698 struct nfsd3_readdirargs *args = rqstp->rq_argp;
699 u32 dircount;
700
701 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
702 return false;
703 if (xdr_stream_decode_u64(xdr, &args->cookie) < 0)
704 return false;
705 args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
706 if (!args->verf)
707 return false;
708 /* dircount is ignored */
709 if (xdr_stream_decode_u32(xdr, &dircount) < 0)
710 return false;
711 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
712 return false;
713
714 return true;
715 }
716
717 bool
718 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
719 {
720 struct nfsd3_commitargs *args = rqstp->rq_argp;
721
722 if (!svcxdr_decode_nfs_fh3(xdr, &args->fh))
723 return false;
724 if (xdr_stream_decode_u64(xdr, &args->offset) < 0)
725 return false;
726 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
727 return false;
728
729 return true;
730 }
731
732 /*
733 * XDR encode functions
734 */
735
736 /* GETATTR */
737 bool
738 nfs3svc_encode_getattrres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
739 {
740 struct nfsd3_attrstat *resp = rqstp->rq_resp;
741
742 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
743 return false;
744 switch (resp->status) {
745 case nfs_ok:
746 lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime);
747 if (!svcxdr_encode_fattr3(rqstp, xdr, &resp->fh, &resp->stat))
748 return false;
749 break;
750 }
751
752 return true;
753 }
754
755 /* SETATTR, REMOVE, RMDIR */
756 bool
757 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, struct xdr_stream *xdr)
758 {
759 struct nfsd3_attrstat *resp = rqstp->rq_resp;
760
761 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
762 svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh);
763 }
764
765 /* LOOKUP */
766 bool
767 nfs3svc_encode_lookupres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
768 {
769 struct nfsd3_diropres *resp = rqstp->rq_resp;
770
771 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
772 return false;
773 switch (resp->status) {
774 case nfs_ok:
775 if (!svcxdr_encode_nfs_fh3(xdr, &resp->fh))
776 return false;
777 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
778 return false;
779 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
780 return false;
781 break;
782 default:
783 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh))
784 return false;
785 }
786
787 return true;
788 }
789
790 /* ACCESS */
791 bool
792 nfs3svc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
793 {
794 struct nfsd3_accessres *resp = rqstp->rq_resp;
795
796 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
797 return false;
798 switch (resp->status) {
799 case nfs_ok:
800 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
801 return false;
802 if (xdr_stream_encode_u32(xdr, resp->access) < 0)
803 return false;
804 break;
805 default:
806 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
807 return false;
808 }
809
810 return true;
811 }
812
813 /* READLINK */
814 bool
815 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
816 {
817 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
818 struct kvec *head = rqstp->rq_res.head;
819
820 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
821 return false;
822 switch (resp->status) {
823 case nfs_ok:
824 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
825 return false;
826 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
827 return false;
828 svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages, 0,
829 resp->len);
830 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
831 return false;
832 break;
833 default:
834 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
835 return false;
836 }
837
838 return true;
839 }
840
841 /* READ */
842 bool
843 nfs3svc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
844 {
845 struct nfsd3_readres *resp = rqstp->rq_resp;
846 struct kvec *head = rqstp->rq_res.head;
847
848 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
849 return false;
850 switch (resp->status) {
851 case nfs_ok:
852 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
853 return false;
854 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
855 return false;
856 if (xdr_stream_encode_bool(xdr, resp->eof) < 0)
857 return false;
858 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
859 return false;
860 svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages,
861 rqstp->rq_res.page_base,
862 resp->count);
863 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
864 return false;
865 break;
866 default:
867 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
868 return false;
869 }
870
871 return true;
872 }
873
874 /* WRITE */
875 bool
876 nfs3svc_encode_writeres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
877 {
878 struct nfsd3_writeres *resp = rqstp->rq_resp;
879
880 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
881 return false;
882 switch (resp->status) {
883 case nfs_ok:
884 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
885 return false;
886 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
887 return false;
888 if (xdr_stream_encode_u32(xdr, resp->committed) < 0)
889 return false;
890 if (!svcxdr_encode_writeverf3(xdr, resp->verf))
891 return false;
892 break;
893 default:
894 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
895 return false;
896 }
897
898 return true;
899 }
900
901 /* CREATE, MKDIR, SYMLINK, MKNOD */
902 bool
903 nfs3svc_encode_createres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
904 {
905 struct nfsd3_diropres *resp = rqstp->rq_resp;
906
907 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
908 return false;
909 switch (resp->status) {
910 case nfs_ok:
911 if (!svcxdr_encode_post_op_fh3(xdr, &resp->fh))
912 return false;
913 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
914 return false;
915 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
916 return false;
917 break;
918 default:
919 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh))
920 return false;
921 }
922
923 return true;
924 }
925
926 /* RENAME */
927 bool
928 nfs3svc_encode_renameres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
929 {
930 struct nfsd3_renameres *resp = rqstp->rq_resp;
931
932 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
933 svcxdr_encode_wcc_data(rqstp, xdr, &resp->ffh) &&
934 svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
935 }
936
937 /* LINK */
938 bool
939 nfs3svc_encode_linkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
940 {
941 struct nfsd3_linkres *resp = rqstp->rq_resp;
942
943 return svcxdr_encode_nfsstat3(xdr, resp->status) &&
944 svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh) &&
945 svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh);
946 }
947
948 /* READDIR */
949 bool
950 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
951 {
952 struct nfsd3_readdirres *resp = rqstp->rq_resp;
953 struct xdr_buf *dirlist = &resp->dirlist;
954
955 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
956 return false;
957 switch (resp->status) {
958 case nfs_ok:
959 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
960 return false;
961 if (!svcxdr_encode_cookieverf3(xdr, resp->verf))
962 return false;
963 svcxdr_encode_opaque_pages(rqstp, xdr, dirlist->pages, 0,
964 dirlist->len);
965 /* no more entries */
966 if (xdr_stream_encode_item_absent(xdr) < 0)
967 return false;
968 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
969 return false;
970 break;
971 default:
972 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh))
973 return false;
974 }
975
976 return true;
977 }
978
979 static __be32
980 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
981 const char *name, int namlen, u64 ino)
982 {
983 struct svc_export *exp;
984 struct dentry *dparent, *dchild;
985 __be32 rv = nfserr_noent;
986
987 dparent = cd->fh.fh_dentry;
988 exp = cd->fh.fh_export;
989
990 if (isdotent(name, namlen)) {
991 if (namlen == 2) {
992 dchild = dget_parent(dparent);
993 /*
994 * Don't return filehandle for ".." if we're at
995 * the filesystem or export root:
996 */
997 if (dchild == dparent)
998 goto out;
999 if (dparent == exp->ex_path.dentry)
1000 goto out;
1001 } else
1002 dchild = dget(dparent);
1003 } else
1004 dchild = lookup_positive_unlocked(name, dparent, namlen);
1005 if (IS_ERR(dchild))
1006 return rv;
1007 if (d_mountpoint(dchild))
1008 goto out;
1009 if (dchild->d_inode->i_ino != ino)
1010 goto out;
1011 rv = fh_compose(fhp, exp, dchild, &cd->fh);
1012 out:
1013 dput(dchild);
1014 return rv;
1015 }
1016
1017 /**
1018 * nfs3svc_encode_cookie3 - Encode a directory offset cookie
1019 * @resp: readdir result context
1020 * @offset: offset cookie to encode
1021 *
1022 * The buffer space for the offset cookie has already been reserved
1023 * by svcxdr_encode_entry3_common().
1024 */
1025 void nfs3svc_encode_cookie3(struct nfsd3_readdirres *resp, u64 offset)
1026 {
1027 __be64 cookie = cpu_to_be64(offset);
1028
1029 if (!resp->cookie_offset)
1030 return;
1031 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
1032 sizeof(cookie));
1033 resp->cookie_offset = 0;
1034 }
1035
1036 static bool
1037 svcxdr_encode_entry3_common(struct nfsd3_readdirres *resp, const char *name,
1038 int namlen, loff_t offset, u64 ino)
1039 {
1040 struct xdr_buf *dirlist = &resp->dirlist;
1041 struct xdr_stream *xdr = &resp->xdr;
1042
1043 if (xdr_stream_encode_item_present(xdr) < 0)
1044 return false;
1045 /* fileid */
1046 if (xdr_stream_encode_u64(xdr, ino) < 0)
1047 return false;
1048 /* name */
1049 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS3_MAXNAMLEN)) < 0)
1050 return false;
1051 /* cookie */
1052 resp->cookie_offset = dirlist->len;
1053 if (xdr_stream_encode_u64(xdr, OFFSET_MAX) < 0)
1054 return false;
1055
1056 return true;
1057 }
1058
1059 /**
1060 * nfs3svc_encode_entry3 - encode one NFSv3 READDIR entry
1061 * @data: directory context
1062 * @name: name of the object to be encoded
1063 * @namlen: length of that name, in bytes
1064 * @offset: the offset of the previous entry
1065 * @ino: the fileid of this entry
1066 * @d_type: unused
1067 *
1068 * Return values:
1069 * %0: Entry was successfully encoded.
1070 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1071 *
1072 * On exit, the following fields are updated:
1073 * - resp->xdr
1074 * - resp->common.err
1075 * - resp->cookie_offset
1076 */
1077 int nfs3svc_encode_entry3(void *data, const char *name, int namlen,
1078 loff_t offset, u64 ino, unsigned int d_type)
1079 {
1080 struct readdir_cd *ccd = data;
1081 struct nfsd3_readdirres *resp = container_of(ccd,
1082 struct nfsd3_readdirres,
1083 common);
1084 unsigned int starting_length = resp->dirlist.len;
1085
1086 /* The offset cookie for the previous entry */
1087 nfs3svc_encode_cookie3(resp, offset);
1088
1089 if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1090 goto out_toosmall;
1091
1092 xdr_commit_encode(&resp->xdr);
1093 resp->common.err = nfs_ok;
1094 return 0;
1095
1096 out_toosmall:
1097 resp->cookie_offset = 0;
1098 resp->common.err = nfserr_toosmall;
1099 resp->dirlist.len = starting_length;
1100 return -EINVAL;
1101 }
1102
1103 static bool
1104 svcxdr_encode_entry3_plus(struct nfsd3_readdirres *resp, const char *name,
1105 int namlen, u64 ino)
1106 {
1107 struct xdr_stream *xdr = &resp->xdr;
1108 struct svc_fh *fhp = &resp->scratch;
1109 bool result;
1110
1111 result = false;
1112 fh_init(fhp, NFS3_FHSIZE);
1113 if (compose_entry_fh(resp, fhp, name, namlen, ino) != nfs_ok)
1114 goto out_noattrs;
1115
1116 if (!svcxdr_encode_post_op_attr(resp->rqstp, xdr, fhp))
1117 goto out;
1118 if (!svcxdr_encode_post_op_fh3(xdr, fhp))
1119 goto out;
1120 result = true;
1121
1122 out:
1123 fh_put(fhp);
1124 return result;
1125
1126 out_noattrs:
1127 if (xdr_stream_encode_item_absent(xdr) < 0)
1128 return false;
1129 if (xdr_stream_encode_item_absent(xdr) < 0)
1130 return false;
1131 return true;
1132 }
1133
1134 /**
1135 * nfs3svc_encode_entryplus3 - encode one NFSv3 READDIRPLUS entry
1136 * @data: directory context
1137 * @name: name of the object to be encoded
1138 * @namlen: length of that name, in bytes
1139 * @offset: the offset of the previous entry
1140 * @ino: the fileid of this entry
1141 * @d_type: unused
1142 *
1143 * Return values:
1144 * %0: Entry was successfully encoded.
1145 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1146 *
1147 * On exit, the following fields are updated:
1148 * - resp->xdr
1149 * - resp->common.err
1150 * - resp->cookie_offset
1151 */
1152 int nfs3svc_encode_entryplus3(void *data, const char *name, int namlen,
1153 loff_t offset, u64 ino, unsigned int d_type)
1154 {
1155 struct readdir_cd *ccd = data;
1156 struct nfsd3_readdirres *resp = container_of(ccd,
1157 struct nfsd3_readdirres,
1158 common);
1159 unsigned int starting_length = resp->dirlist.len;
1160
1161 /* The offset cookie for the previous entry */
1162 nfs3svc_encode_cookie3(resp, offset);
1163
1164 if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1165 goto out_toosmall;
1166 if (!svcxdr_encode_entry3_plus(resp, name, namlen, ino))
1167 goto out_toosmall;
1168
1169 xdr_commit_encode(&resp->xdr);
1170 resp->common.err = nfs_ok;
1171 return 0;
1172
1173 out_toosmall:
1174 resp->cookie_offset = 0;
1175 resp->common.err = nfserr_toosmall;
1176 resp->dirlist.len = starting_length;
1177 return -EINVAL;
1178 }
1179
1180 static bool
1181 svcxdr_encode_fsstat3resok(struct xdr_stream *xdr,
1182 const struct nfsd3_fsstatres *resp)
1183 {
1184 const struct kstatfs *s = &resp->stats;
1185 u64 bs = s->f_bsize;
1186 __be32 *p;
1187
1188 p = xdr_reserve_space(xdr, XDR_UNIT * 13);
1189 if (!p)
1190 return false;
1191 p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */
1192 p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */
1193 p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */
1194 p = xdr_encode_hyper(p, s->f_files); /* total inodes */
1195 p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */
1196 p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */
1197 *p = cpu_to_be32(resp->invarsec); /* mean unchanged time */
1198
1199 return true;
1200 }
1201
1202 /* FSSTAT */
1203 bool
1204 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1205 {
1206 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1207
1208 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1209 return false;
1210 switch (resp->status) {
1211 case nfs_ok:
1212 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1213 return false;
1214 if (!svcxdr_encode_fsstat3resok(xdr, resp))
1215 return false;
1216 break;
1217 default:
1218 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1219 return false;
1220 }
1221
1222 return true;
1223 }
1224
1225 static bool
1226 svcxdr_encode_fsinfo3resok(struct xdr_stream *xdr,
1227 const struct nfsd3_fsinfores *resp)
1228 {
1229 __be32 *p;
1230
1231 p = xdr_reserve_space(xdr, XDR_UNIT * 12);
1232 if (!p)
1233 return false;
1234 *p++ = cpu_to_be32(resp->f_rtmax);
1235 *p++ = cpu_to_be32(resp->f_rtpref);
1236 *p++ = cpu_to_be32(resp->f_rtmult);
1237 *p++ = cpu_to_be32(resp->f_wtmax);
1238 *p++ = cpu_to_be32(resp->f_wtpref);
1239 *p++ = cpu_to_be32(resp->f_wtmult);
1240 *p++ = cpu_to_be32(resp->f_dtpref);
1241 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1242 p = encode_nfstime3(p, &nfs3svc_time_delta);
1243 *p = cpu_to_be32(resp->f_properties);
1244
1245 return true;
1246 }
1247
1248 /* FSINFO */
1249 bool
1250 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1251 {
1252 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1253
1254 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1255 return false;
1256 switch (resp->status) {
1257 case nfs_ok:
1258 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1259 return false;
1260 if (!svcxdr_encode_fsinfo3resok(xdr, resp))
1261 return false;
1262 break;
1263 default:
1264 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1265 return false;
1266 }
1267
1268 return true;
1269 }
1270
1271 static bool
1272 svcxdr_encode_pathconf3resok(struct xdr_stream *xdr,
1273 const struct nfsd3_pathconfres *resp)
1274 {
1275 __be32 *p;
1276
1277 p = xdr_reserve_space(xdr, XDR_UNIT * 6);
1278 if (!p)
1279 return false;
1280 *p++ = cpu_to_be32(resp->p_link_max);
1281 *p++ = cpu_to_be32(resp->p_name_max);
1282 p = xdr_encode_bool(p, resp->p_no_trunc);
1283 p = xdr_encode_bool(p, resp->p_chown_restricted);
1284 p = xdr_encode_bool(p, resp->p_case_insensitive);
1285 xdr_encode_bool(p, resp->p_case_preserving);
1286
1287 return true;
1288 }
1289
1290 /* PATHCONF */
1291 bool
1292 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1293 {
1294 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1295
1296 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1297 return false;
1298 switch (resp->status) {
1299 case nfs_ok:
1300 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1301 return false;
1302 if (!svcxdr_encode_pathconf3resok(xdr, resp))
1303 return false;
1304 break;
1305 default:
1306 if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh))
1307 return false;
1308 }
1309
1310 return true;
1311 }
1312
1313 /* COMMIT */
1314 bool
1315 nfs3svc_encode_commitres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1316 {
1317 struct nfsd3_commitres *resp = rqstp->rq_resp;
1318
1319 if (!svcxdr_encode_nfsstat3(xdr, resp->status))
1320 return false;
1321 switch (resp->status) {
1322 case nfs_ok:
1323 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
1324 return false;
1325 if (!svcxdr_encode_writeverf3(xdr, resp->verf))
1326 return false;
1327 break;
1328 default:
1329 if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh))
1330 return false;
1331 }
1332
1333 return true;
1334 }
1335
1336 /*
1337 * XDR release functions
1338 */
1339 void
1340 nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1341 {
1342 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1343
1344 fh_put(&resp->fh);
1345 }
1346
1347 void
1348 nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1349 {
1350 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1351
1352 fh_put(&resp->fh1);
1353 fh_put(&resp->fh2);
1354 }
1355
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