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 */
20static 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 */
28static 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 */
36static 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
48static __be32 *
49encode_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
57static bool
58svcxdr_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: 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 */
80bool
81svcxdr_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, ptr: &size) < 0)
87 return false;
88 if (size == 0 || size > NFS3_FHSIZE)
89 return false;
90 p = xdr_inline_decode(xdr, nbytes: 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 */
109bool
110svcxdr_encode_nfsstat3(struct xdr_stream *xdr, __be32 status)
111{
112 __be32 *p;
113
114 p = xdr_reserve_space(xdr, nbytes: sizeof(status));
115 if (!p)
116 return false;
117 *p = status;
118
119 return true;
120}
121
122static bool
123svcxdr_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
139static bool
140svcxdr_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
150static bool
151svcxdr_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
163static bool
164svcxdr_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
176static bool
177svcxdr_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, ptr: &size) < 0)
184 return false;
185 if (size == 0 || size > NFS3_MAXNAMLEN)
186 return false;
187 p = xdr_inline_decode(xdr, nbytes: 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
201static bool
202svcxdr_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
209static bool
210svcxdr_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, ptr: &set_it) < 0)
218 return false;
219 if (set_it) {
220 u32 mode;
221
222 if (xdr_stream_decode_u32(xdr, ptr: &mode) < 0)
223 return false;
224 iap->ia_valid |= ATTR_MODE;
225 iap->ia_mode = mode;
226 }
227 if (xdr_stream_decode_bool(xdr, ptr: &set_it) < 0)
228 return false;
229 if (set_it) {
230 u32 uid;
231
232 if (xdr_stream_decode_u32(xdr, ptr: &uid) < 0)
233 return false;
234 iap->ia_uid = make_kuid(from: nfsd_user_namespace(rqstp), uid);
235 if (uid_valid(uid: iap->ia_uid))
236 iap->ia_valid |= ATTR_UID;
237 }
238 if (xdr_stream_decode_bool(xdr, ptr: &set_it) < 0)
239 return false;
240 if (set_it) {
241 u32 gid;
242
243 if (xdr_stream_decode_u32(xdr, ptr: &gid) < 0)
244 return false;
245 iap->ia_gid = make_kgid(from: nfsd_user_namespace(rqstp), gid);
246 if (gid_valid(gid: iap->ia_gid))
247 iap->ia_valid |= ATTR_GID;
248 }
249 if (xdr_stream_decode_bool(xdr, ptr: &set_it) < 0)
250 return false;
251 if (set_it) {
252 u64 newsize;
253
254 if (xdr_stream_decode_u64(xdr, ptr: &newsize) < 0)
255 return false;
256 iap->ia_valid |= ATTR_SIZE;
257 iap->ia_size = newsize;
258 }
259 if (xdr_stream_decode_u32(xdr, ptr: &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, timep: &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, ptr: &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, timep: &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
295static bool
296svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
297{
298 __be32 *p;
299 u32 check;
300
301 if (xdr_stream_decode_bool(xdr, ptr: &check) < 0)
302 return false;
303 if (check) {
304 p = xdr_inline_decode(xdr, XDR_UNIT * 2);
305 if (!p)
306 return false;
307 args->check_guard = 1;
308 args->guardtime = be32_to_cpup(p);
309 } else
310 args->check_guard = 0;
311
312 return true;
313}
314
315static bool
316svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args)
317{
318 __be32 *p;
319
320 p = xdr_inline_decode(xdr, XDR_UNIT * 2);
321 if (!p)
322 return false;
323 args->major = be32_to_cpup(p: p++);
324 args->minor = be32_to_cpup(p);
325
326 return true;
327}
328
329static bool
330svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
331 struct nfsd3_mknodargs *args)
332{
333 return svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs) &&
334 svcxdr_decode_specdata3(xdr, args);
335}
336
337static bool
338svcxdr_encode_fattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
339 const struct svc_fh *fhp, const struct kstat *stat)
340{
341 struct user_namespace *userns = nfsd_user_namespace(rqstp);
342 __be32 *p;
343 u64 fsid;
344
345 p = xdr_reserve_space(xdr, XDR_UNIT * 21);
346 if (!p)
347 return false;
348
349 *p++ = cpu_to_be32(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
350 *p++ = cpu_to_be32((u32)(stat->mode & S_IALLUGO));
351 *p++ = cpu_to_be32((u32)stat->nlink);
352 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
353 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
354 if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN)
355 p = xdr_encode_hyper(p, val: (u64)NFS3_MAXPATHLEN);
356 else
357 p = xdr_encode_hyper(p, val: (u64)stat->size);
358
359 /* used */
360 p = xdr_encode_hyper(p, val: ((u64)stat->blocks) << 9);
361
362 /* rdev */
363 *p++ = cpu_to_be32((u32)MAJOR(stat->rdev));
364 *p++ = cpu_to_be32((u32)MINOR(stat->rdev));
365
366 switch(fsid_source(fhp)) {
367 case FSIDSOURCE_FSID:
368 fsid = (u64)fhp->fh_export->ex_fsid;
369 break;
370 case FSIDSOURCE_UUID:
371 fsid = ((u64 *)fhp->fh_export->ex_uuid)[0];
372 fsid ^= ((u64 *)fhp->fh_export->ex_uuid)[1];
373 break;
374 default:
375 fsid = (u64)huge_encode_dev(dev: fhp->fh_dentry->d_sb->s_dev);
376 }
377 p = xdr_encode_hyper(p, val: fsid);
378
379 /* fileid */
380 p = xdr_encode_hyper(p, val: stat->ino);
381
382 p = encode_nfstime3(p, time: &stat->atime);
383 p = encode_nfstime3(p, time: &stat->mtime);
384 encode_nfstime3(p, time: &stat->ctime);
385
386 return true;
387}
388
389static bool
390svcxdr_encode_wcc_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
391{
392 __be32 *p;
393
394 p = xdr_reserve_space(xdr, XDR_UNIT * 6);
395 if (!p)
396 return false;
397 p = xdr_encode_hyper(p, val: (u64)fhp->fh_pre_size);
398 p = encode_nfstime3(p, time: &fhp->fh_pre_mtime);
399 encode_nfstime3(p, time: &fhp->fh_pre_ctime);
400
401 return true;
402}
403
404static bool
405svcxdr_encode_pre_op_attr(struct xdr_stream *xdr, const struct svc_fh *fhp)
406{
407 if (!fhp->fh_pre_saved) {
408 if (xdr_stream_encode_item_absent(xdr) < 0)
409 return false;
410 return true;
411 }
412
413 if (xdr_stream_encode_item_present(xdr) < 0)
414 return false;
415 return svcxdr_encode_wcc_attr(xdr, fhp);
416}
417
418/**
419 * svcxdr_encode_post_op_attr - Encode NFSv3 post-op attributes
420 * @rqstp: Context of a completed RPC transaction
421 * @xdr: XDR stream
422 * @fhp: File handle to encode
423 *
424 * Return values:
425 * %false: Send buffer space was exhausted
426 * %true: Success
427 */
428bool
429svcxdr_encode_post_op_attr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
430 const struct svc_fh *fhp)
431{
432 struct dentry *dentry = fhp->fh_dentry;
433 struct kstat stat;
434
435 /*
436 * The inode may be NULL if the call failed because of a
437 * stale file handle. In this case, no attributes are
438 * returned.
439 */
440 if (fhp->fh_no_wcc || !dentry || !d_really_is_positive(dentry))
441 goto no_post_op_attrs;
442 if (fh_getattr(fh: fhp, stat: &stat) != nfs_ok)
443 goto no_post_op_attrs;
444
445 if (xdr_stream_encode_item_present(xdr) < 0)
446 return false;
447 lease_get_mtime(d_inode(dentry), time: &stat.mtime);
448 if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, stat: &stat))
449 return false;
450
451 return true;
452
453no_post_op_attrs:
454 return xdr_stream_encode_item_absent(xdr) > 0;
455}
456
457/*
458 * Encode weak cache consistency data
459 */
460static bool
461svcxdr_encode_wcc_data(struct svc_rqst *rqstp, struct xdr_stream *xdr,
462 const struct svc_fh *fhp)
463{
464 struct dentry *dentry = fhp->fh_dentry;
465
466 if (!dentry || !d_really_is_positive(dentry) || !fhp->fh_post_saved)
467 goto neither;
468
469 /* before */
470 if (!svcxdr_encode_pre_op_attr(xdr, fhp))
471 return false;
472
473 /* after */
474 if (xdr_stream_encode_item_present(xdr) < 0)
475 return false;
476 if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, stat: &fhp->fh_post_attr))
477 return false;
478
479 return true;
480
481neither:
482 if (xdr_stream_encode_item_absent(xdr) < 0)
483 return false;
484 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp))
485 return false;
486
487 return true;
488}
489
490/*
491 * XDR decode functions
492 */
493
494bool
495nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
496{
497 struct nfsd_fhandle *args = rqstp->rq_argp;
498
499 return svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh);
500}
501
502bool
503nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
504{
505 struct nfsd3_sattrargs *args = rqstp->rq_argp;
506
507 return svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh) &&
508 svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs) &&
509 svcxdr_decode_sattrguard3(xdr, args);
510}
511
512bool
513nfs3svc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
514{
515 struct nfsd3_diropargs *args = rqstp->rq_argp;
516
517 return svcxdr_decode_diropargs3(xdr, fhp: &args->fh, name: &args->name, len: &args->len);
518}
519
520bool
521nfs3svc_decode_accessargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
522{
523 struct nfsd3_accessargs *args = rqstp->rq_argp;
524
525 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
526 return false;
527 if (xdr_stream_decode_u32(xdr, ptr: &args->access) < 0)
528 return false;
529
530 return true;
531}
532
533bool
534nfs3svc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
535{
536 struct nfsd3_readargs *args = rqstp->rq_argp;
537
538 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
539 return false;
540 if (xdr_stream_decode_u64(xdr, ptr: &args->offset) < 0)
541 return false;
542 if (xdr_stream_decode_u32(xdr, ptr: &args->count) < 0)
543 return false;
544
545 return true;
546}
547
548bool
549nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
550{
551 struct nfsd3_writeargs *args = rqstp->rq_argp;
552 u32 max_blocksize = svc_max_payload(rqstp);
553
554 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
555 return false;
556 if (xdr_stream_decode_u64(xdr, ptr: &args->offset) < 0)
557 return false;
558 if (xdr_stream_decode_u32(xdr, ptr: &args->count) < 0)
559 return false;
560 if (xdr_stream_decode_u32(xdr, ptr: &args->stable) < 0)
561 return false;
562
563 /* opaque data */
564 if (xdr_stream_decode_u32(xdr, ptr: &args->len) < 0)
565 return false;
566
567 /* request sanity */
568 if (args->count != args->len)
569 return false;
570 if (args->count > max_blocksize) {
571 args->count = max_blocksize;
572 args->len = max_blocksize;
573 }
574
575 return xdr_stream_subsegment(xdr, subbuf: &args->payload, len: args->count);
576}
577
578bool
579nfs3svc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
580{
581 struct nfsd3_createargs *args = rqstp->rq_argp;
582
583 if (!svcxdr_decode_diropargs3(xdr, fhp: &args->fh, name: &args->name, len: &args->len))
584 return false;
585 if (xdr_stream_decode_u32(xdr, ptr: &args->createmode) < 0)
586 return false;
587 switch (args->createmode) {
588 case NFS3_CREATE_UNCHECKED:
589 case NFS3_CREATE_GUARDED:
590 return svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs);
591 case NFS3_CREATE_EXCLUSIVE:
592 args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE);
593 if (!args->verf)
594 return false;
595 break;
596 default:
597 return false;
598 }
599 return true;
600}
601
602bool
603nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
604{
605 struct nfsd3_createargs *args = rqstp->rq_argp;
606
607 return svcxdr_decode_diropargs3(xdr, fhp: &args->fh,
608 name: &args->name, len: &args->len) &&
609 svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs);
610}
611
612bool
613nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
614{
615 struct nfsd3_symlinkargs *args = rqstp->rq_argp;
616 struct kvec *head = rqstp->rq_arg.head;
617
618 if (!svcxdr_decode_diropargs3(xdr, fhp: &args->ffh, name: &args->fname, len: &args->flen))
619 return false;
620 if (!svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs))
621 return false;
622 if (xdr_stream_decode_u32(xdr, ptr: &args->tlen) < 0)
623 return false;
624
625 /* symlink_data */
626 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
627 args->first.iov_base = xdr_inline_decode(xdr, nbytes: args->tlen);
628 return args->first.iov_base != NULL;
629}
630
631bool
632nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
633{
634 struct nfsd3_mknodargs *args = rqstp->rq_argp;
635
636 if (!svcxdr_decode_diropargs3(xdr, fhp: &args->fh, name: &args->name, len: &args->len))
637 return false;
638 if (xdr_stream_decode_u32(xdr, ptr: &args->ftype) < 0)
639 return false;
640 switch (args->ftype) {
641 case NF3CHR:
642 case NF3BLK:
643 return svcxdr_decode_devicedata3(rqstp, xdr, args);
644 case NF3SOCK:
645 case NF3FIFO:
646 return svcxdr_decode_sattr3(rqstp, xdr, iap: &args->attrs);
647 case NF3REG:
648 case NF3DIR:
649 case NF3LNK:
650 /* Valid XDR but illegal file types */
651 break;
652 default:
653 return false;
654 }
655
656 return true;
657}
658
659bool
660nfs3svc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
661{
662 struct nfsd3_renameargs *args = rqstp->rq_argp;
663
664 return svcxdr_decode_diropargs3(xdr, fhp: &args->ffh,
665 name: &args->fname, len: &args->flen) &&
666 svcxdr_decode_diropargs3(xdr, fhp: &args->tfh,
667 name: &args->tname, len: &args->tlen);
668}
669
670bool
671nfs3svc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
672{
673 struct nfsd3_linkargs *args = rqstp->rq_argp;
674
675 return svcxdr_decode_nfs_fh3(xdr, fhp: &args->ffh) &&
676 svcxdr_decode_diropargs3(xdr, fhp: &args->tfh,
677 name: &args->tname, len: &args->tlen);
678}
679
680bool
681nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
682{
683 struct nfsd3_readdirargs *args = rqstp->rq_argp;
684
685 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
686 return false;
687 if (xdr_stream_decode_u64(xdr, ptr: &args->cookie) < 0)
688 return false;
689 args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
690 if (!args->verf)
691 return false;
692 if (xdr_stream_decode_u32(xdr, ptr: &args->count) < 0)
693 return false;
694
695 return true;
696}
697
698bool
699nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
700{
701 struct nfsd3_readdirargs *args = rqstp->rq_argp;
702 u32 dircount;
703
704 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
705 return false;
706 if (xdr_stream_decode_u64(xdr, ptr: &args->cookie) < 0)
707 return false;
708 args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
709 if (!args->verf)
710 return false;
711 /* dircount is ignored */
712 if (xdr_stream_decode_u32(xdr, ptr: &dircount) < 0)
713 return false;
714 if (xdr_stream_decode_u32(xdr, ptr: &args->count) < 0)
715 return false;
716
717 return true;
718}
719
720bool
721nfs3svc_decode_commitargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
722{
723 struct nfsd3_commitargs *args = rqstp->rq_argp;
724
725 if (!svcxdr_decode_nfs_fh3(xdr, fhp: &args->fh))
726 return false;
727 if (xdr_stream_decode_u64(xdr, ptr: &args->offset) < 0)
728 return false;
729 if (xdr_stream_decode_u32(xdr, ptr: &args->count) < 0)
730 return false;
731
732 return true;
733}
734
735/*
736 * XDR encode functions
737 */
738
739/* GETATTR */
740bool
741nfs3svc_encode_getattrres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
742{
743 struct nfsd3_attrstat *resp = rqstp->rq_resp;
744
745 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
746 return false;
747 switch (resp->status) {
748 case nfs_ok:
749 lease_get_mtime(d_inode(dentry: resp->fh.fh_dentry), time: &resp->stat.mtime);
750 if (!svcxdr_encode_fattr3(rqstp, xdr, fhp: &resp->fh, stat: &resp->stat))
751 return false;
752 break;
753 }
754
755 return true;
756}
757
758/* SETATTR, REMOVE, RMDIR */
759bool
760nfs3svc_encode_wccstat(struct svc_rqst *rqstp, struct xdr_stream *xdr)
761{
762 struct nfsd3_attrstat *resp = rqstp->rq_resp;
763
764 return svcxdr_encode_nfsstat3(xdr, status: resp->status) &&
765 svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->fh);
766}
767
768/* LOOKUP */
769bool
770nfs3svc_encode_lookupres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
771{
772 struct nfsd3_diropres *resp = rqstp->rq_resp;
773
774 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
775 return false;
776 switch (resp->status) {
777 case nfs_ok:
778 if (!svcxdr_encode_nfs_fh3(xdr, fhp: &resp->fh))
779 return false;
780 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
781 return false;
782 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->dirfh))
783 return false;
784 break;
785 default:
786 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->dirfh))
787 return false;
788 }
789
790 return true;
791}
792
793/* ACCESS */
794bool
795nfs3svc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
796{
797 struct nfsd3_accessres *resp = rqstp->rq_resp;
798
799 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
800 return false;
801 switch (resp->status) {
802 case nfs_ok:
803 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
804 return false;
805 if (xdr_stream_encode_u32(xdr, n: resp->access) < 0)
806 return false;
807 break;
808 default:
809 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
810 return false;
811 }
812
813 return true;
814}
815
816/* READLINK */
817bool
818nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
819{
820 struct nfsd3_readlinkres *resp = rqstp->rq_resp;
821 struct kvec *head = rqstp->rq_res.head;
822
823 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
824 return false;
825 switch (resp->status) {
826 case nfs_ok:
827 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
828 return false;
829 if (xdr_stream_encode_u32(xdr, n: resp->len) < 0)
830 return false;
831 svcxdr_encode_opaque_pages(rqstp, xdr, pages: resp->pages, base: 0,
832 len: resp->len);
833 if (svc_encode_result_payload(rqstp, offset: head->iov_len, length: resp->len) < 0)
834 return false;
835 break;
836 default:
837 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
838 return false;
839 }
840
841 return true;
842}
843
844/* READ */
845bool
846nfs3svc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
847{
848 struct nfsd3_readres *resp = rqstp->rq_resp;
849 struct kvec *head = rqstp->rq_res.head;
850
851 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
852 return false;
853 switch (resp->status) {
854 case nfs_ok:
855 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
856 return false;
857 if (xdr_stream_encode_u32(xdr, n: resp->count) < 0)
858 return false;
859 if (xdr_stream_encode_bool(xdr, n: resp->eof) < 0)
860 return false;
861 if (xdr_stream_encode_u32(xdr, n: resp->count) < 0)
862 return false;
863 svcxdr_encode_opaque_pages(rqstp, xdr, pages: resp->pages,
864 base: rqstp->rq_res.page_base,
865 len: resp->count);
866 if (svc_encode_result_payload(rqstp, offset: head->iov_len, length: resp->count) < 0)
867 return false;
868 break;
869 default:
870 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
871 return false;
872 }
873
874 return true;
875}
876
877/* WRITE */
878bool
879nfs3svc_encode_writeres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
880{
881 struct nfsd3_writeres *resp = rqstp->rq_resp;
882
883 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
884 return false;
885 switch (resp->status) {
886 case nfs_ok:
887 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->fh))
888 return false;
889 if (xdr_stream_encode_u32(xdr, n: resp->count) < 0)
890 return false;
891 if (xdr_stream_encode_u32(xdr, n: resp->committed) < 0)
892 return false;
893 if (!svcxdr_encode_writeverf3(xdr, verf: resp->verf))
894 return false;
895 break;
896 default:
897 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->fh))
898 return false;
899 }
900
901 return true;
902}
903
904/* CREATE, MKDIR, SYMLINK, MKNOD */
905bool
906nfs3svc_encode_createres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
907{
908 struct nfsd3_diropres *resp = rqstp->rq_resp;
909
910 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
911 return false;
912 switch (resp->status) {
913 case nfs_ok:
914 if (!svcxdr_encode_post_op_fh3(xdr, fhp: &resp->fh))
915 return false;
916 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
917 return false;
918 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->dirfh))
919 return false;
920 break;
921 default:
922 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->dirfh))
923 return false;
924 }
925
926 return true;
927}
928
929/* RENAME */
930bool
931nfs3svc_encode_renameres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
932{
933 struct nfsd3_renameres *resp = rqstp->rq_resp;
934
935 return svcxdr_encode_nfsstat3(xdr, status: resp->status) &&
936 svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->ffh) &&
937 svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->tfh);
938}
939
940/* LINK */
941bool
942nfs3svc_encode_linkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
943{
944 struct nfsd3_linkres *resp = rqstp->rq_resp;
945
946 return svcxdr_encode_nfsstat3(xdr, status: resp->status) &&
947 svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh) &&
948 svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->tfh);
949}
950
951/* READDIR */
952bool
953nfs3svc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
954{
955 struct nfsd3_readdirres *resp = rqstp->rq_resp;
956 struct xdr_buf *dirlist = &resp->dirlist;
957
958 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
959 return false;
960 switch (resp->status) {
961 case nfs_ok:
962 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
963 return false;
964 if (!svcxdr_encode_cookieverf3(xdr, verf: resp->verf))
965 return false;
966 svcxdr_encode_opaque_pages(rqstp, xdr, pages: dirlist->pages, base: 0,
967 len: dirlist->len);
968 /* no more entries */
969 if (xdr_stream_encode_item_absent(xdr) < 0)
970 return false;
971 if (xdr_stream_encode_bool(xdr, n: resp->common.err == nfserr_eof) < 0)
972 return false;
973 break;
974 default:
975 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &resp->fh))
976 return false;
977 }
978
979 return true;
980}
981
982static __be32
983compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
984 const char *name, int namlen, u64 ino)
985{
986 struct svc_export *exp;
987 struct dentry *dparent, *dchild;
988 __be32 rv = nfserr_noent;
989
990 dparent = cd->fh.fh_dentry;
991 exp = cd->fh.fh_export;
992
993 if (isdotent(name, namlen)) {
994 if (namlen == 2) {
995 dchild = dget_parent(dentry: dparent);
996 /*
997 * Don't return filehandle for ".." if we're at
998 * the filesystem or export root:
999 */
1000 if (dchild == dparent)
1001 goto out;
1002 if (dparent == exp->ex_path.dentry)
1003 goto out;
1004 } else
1005 dchild = dget(dentry: dparent);
1006 } else
1007 dchild = lookup_positive_unlocked(name, dparent, namlen);
1008 if (IS_ERR(ptr: dchild))
1009 return rv;
1010 if (d_mountpoint(dentry: dchild))
1011 goto out;
1012 if (dchild->d_inode->i_ino != ino)
1013 goto out;
1014 rv = fh_compose(fhp, exp, dchild, &cd->fh);
1015out:
1016 dput(dchild);
1017 return rv;
1018}
1019
1020/**
1021 * nfs3svc_encode_cookie3 - Encode a directory offset cookie
1022 * @resp: readdir result context
1023 * @offset: offset cookie to encode
1024 *
1025 * The buffer space for the offset cookie has already been reserved
1026 * by svcxdr_encode_entry3_common().
1027 */
1028void nfs3svc_encode_cookie3(struct nfsd3_readdirres *resp, u64 offset)
1029{
1030 __be64 cookie = cpu_to_be64(offset);
1031
1032 if (!resp->cookie_offset)
1033 return;
1034 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
1035 sizeof(cookie));
1036 resp->cookie_offset = 0;
1037}
1038
1039static bool
1040svcxdr_encode_entry3_common(struct nfsd3_readdirres *resp, const char *name,
1041 int namlen, loff_t offset, u64 ino)
1042{
1043 struct xdr_buf *dirlist = &resp->dirlist;
1044 struct xdr_stream *xdr = &resp->xdr;
1045
1046 if (xdr_stream_encode_item_present(xdr) < 0)
1047 return false;
1048 /* fileid */
1049 if (xdr_stream_encode_u64(xdr, n: ino) < 0)
1050 return false;
1051 /* name */
1052 if (xdr_stream_encode_opaque(xdr, ptr: name, min(namlen, NFS3_MAXNAMLEN)) < 0)
1053 return false;
1054 /* cookie */
1055 resp->cookie_offset = dirlist->len;
1056 if (xdr_stream_encode_u64(xdr, OFFSET_MAX) < 0)
1057 return false;
1058
1059 return true;
1060}
1061
1062/**
1063 * nfs3svc_encode_entry3 - encode one NFSv3 READDIR entry
1064 * @data: directory context
1065 * @name: name of the object to be encoded
1066 * @namlen: length of that name, in bytes
1067 * @offset: the offset of the previous entry
1068 * @ino: the fileid of this entry
1069 * @d_type: unused
1070 *
1071 * Return values:
1072 * %0: Entry was successfully encoded.
1073 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1074 *
1075 * On exit, the following fields are updated:
1076 * - resp->xdr
1077 * - resp->common.err
1078 * - resp->cookie_offset
1079 */
1080int nfs3svc_encode_entry3(void *data, const char *name, int namlen,
1081 loff_t offset, u64 ino, unsigned int d_type)
1082{
1083 struct readdir_cd *ccd = data;
1084 struct nfsd3_readdirres *resp = container_of(ccd,
1085 struct nfsd3_readdirres,
1086 common);
1087 unsigned int starting_length = resp->dirlist.len;
1088
1089 /* The offset cookie for the previous entry */
1090 nfs3svc_encode_cookie3(resp, offset);
1091
1092 if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1093 goto out_toosmall;
1094
1095 xdr_commit_encode(xdr: &resp->xdr);
1096 resp->common.err = nfs_ok;
1097 return 0;
1098
1099out_toosmall:
1100 resp->cookie_offset = 0;
1101 resp->common.err = nfserr_toosmall;
1102 resp->dirlist.len = starting_length;
1103 return -EINVAL;
1104}
1105
1106static bool
1107svcxdr_encode_entry3_plus(struct nfsd3_readdirres *resp, const char *name,
1108 int namlen, u64 ino)
1109{
1110 struct xdr_stream *xdr = &resp->xdr;
1111 struct svc_fh *fhp = &resp->scratch;
1112 bool result;
1113
1114 result = false;
1115 fh_init(fhp, NFS3_FHSIZE);
1116 if (compose_entry_fh(cd: resp, fhp, name, namlen, ino) != nfs_ok)
1117 goto out_noattrs;
1118
1119 if (!svcxdr_encode_post_op_attr(rqstp: resp->rqstp, xdr, fhp))
1120 goto out;
1121 if (!svcxdr_encode_post_op_fh3(xdr, fhp))
1122 goto out;
1123 result = true;
1124
1125out:
1126 fh_put(fhp);
1127 return result;
1128
1129out_noattrs:
1130 if (xdr_stream_encode_item_absent(xdr) < 0)
1131 return false;
1132 if (xdr_stream_encode_item_absent(xdr) < 0)
1133 return false;
1134 return true;
1135}
1136
1137/**
1138 * nfs3svc_encode_entryplus3 - encode one NFSv3 READDIRPLUS entry
1139 * @data: directory context
1140 * @name: name of the object to be encoded
1141 * @namlen: length of that name, in bytes
1142 * @offset: the offset of the previous entry
1143 * @ino: the fileid of this entry
1144 * @d_type: unused
1145 *
1146 * Return values:
1147 * %0: Entry was successfully encoded.
1148 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
1149 *
1150 * On exit, the following fields are updated:
1151 * - resp->xdr
1152 * - resp->common.err
1153 * - resp->cookie_offset
1154 */
1155int nfs3svc_encode_entryplus3(void *data, const char *name, int namlen,
1156 loff_t offset, u64 ino, unsigned int d_type)
1157{
1158 struct readdir_cd *ccd = data;
1159 struct nfsd3_readdirres *resp = container_of(ccd,
1160 struct nfsd3_readdirres,
1161 common);
1162 unsigned int starting_length = resp->dirlist.len;
1163
1164 /* The offset cookie for the previous entry */
1165 nfs3svc_encode_cookie3(resp, offset);
1166
1167 if (!svcxdr_encode_entry3_common(resp, name, namlen, offset, ino))
1168 goto out_toosmall;
1169 if (!svcxdr_encode_entry3_plus(resp, name, namlen, ino))
1170 goto out_toosmall;
1171
1172 xdr_commit_encode(xdr: &resp->xdr);
1173 resp->common.err = nfs_ok;
1174 return 0;
1175
1176out_toosmall:
1177 resp->cookie_offset = 0;
1178 resp->common.err = nfserr_toosmall;
1179 resp->dirlist.len = starting_length;
1180 return -EINVAL;
1181}
1182
1183static bool
1184svcxdr_encode_fsstat3resok(struct xdr_stream *xdr,
1185 const struct nfsd3_fsstatres *resp)
1186{
1187 const struct kstatfs *s = &resp->stats;
1188 u64 bs = s->f_bsize;
1189 __be32 *p;
1190
1191 p = xdr_reserve_space(xdr, XDR_UNIT * 13);
1192 if (!p)
1193 return false;
1194 p = xdr_encode_hyper(p, val: bs * s->f_blocks); /* total bytes */
1195 p = xdr_encode_hyper(p, val: bs * s->f_bfree); /* free bytes */
1196 p = xdr_encode_hyper(p, val: bs * s->f_bavail); /* user available bytes */
1197 p = xdr_encode_hyper(p, val: s->f_files); /* total inodes */
1198 p = xdr_encode_hyper(p, val: s->f_ffree); /* free inodes */
1199 p = xdr_encode_hyper(p, val: s->f_ffree); /* user available inodes */
1200 *p = cpu_to_be32(resp->invarsec); /* mean unchanged time */
1201
1202 return true;
1203}
1204
1205/* FSSTAT */
1206bool
1207nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1208{
1209 struct nfsd3_fsstatres *resp = rqstp->rq_resp;
1210
1211 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
1212 return false;
1213 switch (resp->status) {
1214 case nfs_ok:
1215 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1216 return false;
1217 if (!svcxdr_encode_fsstat3resok(xdr, resp))
1218 return false;
1219 break;
1220 default:
1221 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1222 return false;
1223 }
1224
1225 return true;
1226}
1227
1228static bool
1229svcxdr_encode_fsinfo3resok(struct xdr_stream *xdr,
1230 const struct nfsd3_fsinfores *resp)
1231{
1232 __be32 *p;
1233
1234 p = xdr_reserve_space(xdr, XDR_UNIT * 12);
1235 if (!p)
1236 return false;
1237 *p++ = cpu_to_be32(resp->f_rtmax);
1238 *p++ = cpu_to_be32(resp->f_rtpref);
1239 *p++ = cpu_to_be32(resp->f_rtmult);
1240 *p++ = cpu_to_be32(resp->f_wtmax);
1241 *p++ = cpu_to_be32(resp->f_wtpref);
1242 *p++ = cpu_to_be32(resp->f_wtmult);
1243 *p++ = cpu_to_be32(resp->f_dtpref);
1244 p = xdr_encode_hyper(p, val: resp->f_maxfilesize);
1245 p = encode_nfstime3(p, time: &nfs3svc_time_delta);
1246 *p = cpu_to_be32(resp->f_properties);
1247
1248 return true;
1249}
1250
1251/* FSINFO */
1252bool
1253nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1254{
1255 struct nfsd3_fsinfores *resp = rqstp->rq_resp;
1256
1257 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
1258 return false;
1259 switch (resp->status) {
1260 case nfs_ok:
1261 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1262 return false;
1263 if (!svcxdr_encode_fsinfo3resok(xdr, resp))
1264 return false;
1265 break;
1266 default:
1267 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1268 return false;
1269 }
1270
1271 return true;
1272}
1273
1274static bool
1275svcxdr_encode_pathconf3resok(struct xdr_stream *xdr,
1276 const struct nfsd3_pathconfres *resp)
1277{
1278 __be32 *p;
1279
1280 p = xdr_reserve_space(xdr, XDR_UNIT * 6);
1281 if (!p)
1282 return false;
1283 *p++ = cpu_to_be32(resp->p_link_max);
1284 *p++ = cpu_to_be32(resp->p_name_max);
1285 p = xdr_encode_bool(p, n: resp->p_no_trunc);
1286 p = xdr_encode_bool(p, n: resp->p_chown_restricted);
1287 p = xdr_encode_bool(p, n: resp->p_case_insensitive);
1288 xdr_encode_bool(p, n: resp->p_case_preserving);
1289
1290 return true;
1291}
1292
1293/* PATHCONF */
1294bool
1295nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1296{
1297 struct nfsd3_pathconfres *resp = rqstp->rq_resp;
1298
1299 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
1300 return false;
1301 switch (resp->status) {
1302 case nfs_ok:
1303 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1304 return false;
1305 if (!svcxdr_encode_pathconf3resok(xdr, resp))
1306 return false;
1307 break;
1308 default:
1309 if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp: &nfs3svc_null_fh))
1310 return false;
1311 }
1312
1313 return true;
1314}
1315
1316/* COMMIT */
1317bool
1318nfs3svc_encode_commitres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
1319{
1320 struct nfsd3_commitres *resp = rqstp->rq_resp;
1321
1322 if (!svcxdr_encode_nfsstat3(xdr, status: resp->status))
1323 return false;
1324 switch (resp->status) {
1325 case nfs_ok:
1326 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->fh))
1327 return false;
1328 if (!svcxdr_encode_writeverf3(xdr, verf: resp->verf))
1329 return false;
1330 break;
1331 default:
1332 if (!svcxdr_encode_wcc_data(rqstp, xdr, fhp: &resp->fh))
1333 return false;
1334 }
1335
1336 return true;
1337}
1338
1339/*
1340 * XDR release functions
1341 */
1342void
1343nfs3svc_release_fhandle(struct svc_rqst *rqstp)
1344{
1345 struct nfsd3_attrstat *resp = rqstp->rq_resp;
1346
1347 fh_put(&resp->fh);
1348}
1349
1350void
1351nfs3svc_release_fhandle2(struct svc_rqst *rqstp)
1352{
1353 struct nfsd3_fhandle_pair *resp = rqstp->rq_resp;
1354
1355 fh_put(&resp->fh1);
1356 fh_put(&resp->fh2);
1357}
1358

source code of linux/fs/nfsd/nfs3xdr.c