1 /*
2 * Server-side XDR for NFSv4
3 *
4 * Copyright (c) 2002 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/statfs.h>
40 #include <linux/utsname.h>
41 #include <linux/pagemap.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/xattr.h>
45 #include <linux/vmalloc.h>
46
47 #include <uapi/linux/xattr.h>
48
49 #include "idmap.h"
50 #include "acl.h"
51 #include "xdr4.h"
52 #include "vfs.h"
53 #include "state.h"
54 #include "cache.h"
55 #include "netns.h"
56 #include "pnfs.h"
57 #include "filecache.h"
58
59 #include "trace.h"
60
61 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
62 #include <linux/security.h>
63 #endif
64
65
66 #define NFSDDBG_FACILITY NFSDDBG_XDR
67
68 const u32 nfsd_suppattrs[3][3] = {
69 {NFSD4_SUPPORTED_ATTRS_WORD0,
70 NFSD4_SUPPORTED_ATTRS_WORD1,
71 NFSD4_SUPPORTED_ATTRS_WORD2},
72
73 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
74 NFSD4_1_SUPPORTED_ATTRS_WORD1,
75 NFSD4_1_SUPPORTED_ATTRS_WORD2},
76
77 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
78 NFSD4_1_SUPPORTED_ATTRS_WORD1,
79 NFSD4_2_SUPPORTED_ATTRS_WORD2},
80 };
81
82 /*
83 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
84 * directory in order to indicate to the client that a filesystem boundary is present
85 * We use a fixed fsid for a referral
86 */
87 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
88 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
89
90 static __be32
91 check_filename(char *str, int len)
92 {
93 int i;
94
95 if (len == 0)
96 return nfserr_inval;
97 if (len > NFS4_MAXNAMLEN)
98 return nfserr_nametoolong;
99 if (isdotent(str, len))
100 return nfserr_badname;
101 for (i = 0; i < len; i++)
102 if (str[i] == '/')
103 return nfserr_badname;
104 return 0;
105 }
106
107 static int zero_clientid(clientid_t *clid)
108 {
109 return (clid->cl_boot == 0) && (clid->cl_id == 0);
110 }
111
112 /**
113 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
114 * @argp: NFSv4 compound argument structure
115 * @len: length of buffer to allocate
116 *
117 * Allocates a buffer of size @len to be freed when processing the compound
118 * operation described in @argp finishes.
119 */
120 static void *
121 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, size_t len)
122 {
123 struct svcxdr_tmpbuf *tb;
124
125 tb = kmalloc(struct_size(tb, buf, len), GFP_KERNEL);
126 if (!tb)
127 return NULL;
128 tb->next = argp->to_free;
129 argp->to_free = tb;
130 return tb->buf;
131 }
132
133 /*
134 * For xdr strings that need to be passed to other kernel api's
135 * as null-terminated strings.
136 *
137 * Note null-terminating in place usually isn't safe since the
138 * buffer might end on a page boundary.
139 */
140 static char *
141 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, size_t len)
142 {
143 char *p = svcxdr_tmpalloc(argp, size_add(len, 1));
144
145 if (!p)
146 return NULL;
147 memcpy(p, buf, len);
148 p[len] = '\0';
149 return p;
150 }
151
152 static void *
153 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, size_t len)
154 {
155 __be32 *tmp;
156
157 /*
158 * The location of the decoded data item is stable,
159 * so @p is OK to use. This is the common case.
160 */
161 if (p != argp->xdr->scratch.iov_base)
162 return p;
163
164 tmp = svcxdr_tmpalloc(argp, len);
165 if (!tmp)
166 return NULL;
167 memcpy(tmp, p, len);
168 return tmp;
169 }
170
171 /*
172 * NFSv4 basic data type decoders
173 */
174
175 /*
176 * This helper handles variable-length opaques which belong to protocol
177 * elements that this implementation does not support.
178 */
179 static __be32
180 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
181 {
182 u32 len;
183
184 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
185 return nfserr_bad_xdr;
186 if (maxlen && len > maxlen)
187 return nfserr_bad_xdr;
188 if (!xdr_inline_decode(argp->xdr, len))
189 return nfserr_bad_xdr;
190
191 return nfs_ok;
192 }
193
194 static __be32
195 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
196 {
197 __be32 *p;
198 u32 len;
199
200 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
201 return nfserr_bad_xdr;
202 if (len == 0 || len > NFS4_OPAQUE_LIMIT)
203 return nfserr_bad_xdr;
204 p = xdr_inline_decode(argp->xdr, len);
205 if (!p)
206 return nfserr_bad_xdr;
207 o->data = svcxdr_savemem(argp, p, len);
208 if (!o->data)
209 return nfserr_jukebox;
210 o->len = len;
211
212 return nfs_ok;
213 }
214
215 static __be32
216 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
217 {
218 __be32 *p, status;
219
220 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
221 return nfserr_bad_xdr;
222 p = xdr_inline_decode(argp->xdr, *lenp);
223 if (!p)
224 return nfserr_bad_xdr;
225 status = check_filename((char *)p, *lenp);
226 if (status)
227 return status;
228 *namp = svcxdr_savemem(argp, p, *lenp);
229 if (!*namp)
230 return nfserr_jukebox;
231
232 return nfs_ok;
233 }
234
235 static __be32
236 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
237 {
238 __be32 *p;
239
240 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
241 if (!p)
242 return nfserr_bad_xdr;
243 p = xdr_decode_hyper(p, &tv->tv_sec);
244 tv->tv_nsec = be32_to_cpup(p++);
245 if (tv->tv_nsec >= (u32)1000000000)
246 return nfserr_inval;
247 return nfs_ok;
248 }
249
250 static __be32
251 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
252 {
253 __be32 *p;
254
255 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
256 if (!p)
257 return nfserr_bad_xdr;
258 memcpy(verf->data, p, sizeof(verf->data));
259 return nfs_ok;
260 }
261
262 /**
263 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
264 * @argp: NFSv4 compound argument structure
265 * @bmval: pointer to an array of u32's to decode into
266 * @bmlen: size of the @bmval array
267 *
268 * The server needs to return nfs_ok rather than nfserr_bad_xdr when
269 * encountering bitmaps containing bits it does not recognize. This
270 * includes bits in bitmap words past WORDn, where WORDn is the last
271 * bitmap WORD the implementation currently supports. Thus we are
272 * careful here to simply ignore bits in bitmap words that this
273 * implementation has yet to support explicitly.
274 *
275 * Return values:
276 * %nfs_ok: @bmval populated successfully
277 * %nfserr_bad_xdr: the encoded bitmap was invalid
278 */
279 static __be32
280 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
281 {
282 ssize_t status;
283
284 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
285 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
286 }
287
288 static __be32
289 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
290 {
291 __be32 *p, status;
292 u32 length;
293
294 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
295 return nfserr_bad_xdr;
296 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
297 return nfserr_bad_xdr;
298 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
299 return nfserr_bad_xdr;
300
301 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
302 return nfserr_bad_xdr;
303 p = xdr_inline_decode(argp->xdr, length);
304 if (!p)
305 return nfserr_bad_xdr;
306 ace->whotype = nfs4_acl_get_whotype((char *)p, length);
307 if (ace->whotype != NFS4_ACL_WHO_NAMED)
308 status = nfs_ok;
309 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
310 status = nfsd_map_name_to_gid(argp->rqstp,
311 (char *)p, length, &ace->who_gid);
312 else
313 status = nfsd_map_name_to_uid(argp->rqstp,
314 (char *)p, length, &ace->who_uid);
315
316 return status;
317 }
318
319 /* A counted array of nfsace4's */
320 static noinline __be32
321 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
322 {
323 struct nfs4_ace *ace;
324 __be32 status;
325 u32 count;
326
327 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
328 return nfserr_bad_xdr;
329
330 if (count > xdr_stream_remaining(argp->xdr) / 20)
331 /*
332 * Even with 4-byte names there wouldn't be
333 * space for that many aces; something fishy is
334 * going on:
335 */
336 return nfserr_fbig;
337
338 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
339 if (*acl == NULL)
340 return nfserr_jukebox;
341
342 (*acl)->naces = count;
343 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
344 status = nfsd4_decode_nfsace4(argp, ace);
345 if (status)
346 return status;
347 }
348
349 return nfs_ok;
350 }
351
352 static noinline __be32
353 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
354 struct xdr_netobj *label)
355 {
356 u32 lfs, pi, length;
357 __be32 *p;
358
359 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
360 return nfserr_bad_xdr;
361 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
362 return nfserr_bad_xdr;
363
364 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
365 return nfserr_bad_xdr;
366 if (length > NFS4_MAXLABELLEN)
367 return nfserr_badlabel;
368 p = xdr_inline_decode(argp->xdr, length);
369 if (!p)
370 return nfserr_bad_xdr;
371 label->len = length;
372 label->data = svcxdr_dupstr(argp, p, length);
373 if (!label->data)
374 return nfserr_jukebox;
375
376 return nfs_ok;
377 }
378
379 static __be32
380 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
381 struct iattr *iattr, struct nfs4_acl **acl,
382 struct xdr_netobj *label, int *umask)
383 {
384 unsigned int starting_pos;
385 u32 attrlist4_count;
386 __be32 *p, status;
387
388 iattr->ia_valid = 0;
389 status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
390 if (status)
391 return nfserr_bad_xdr;
392
393 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
394 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
395 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
396 if (nfsd_attrs_supported(argp->minorversion, bmval))
397 return nfserr_inval;
398 return nfserr_attrnotsupp;
399 }
400
401 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
402 return nfserr_bad_xdr;
403 starting_pos = xdr_stream_pos(argp->xdr);
404
405 if (bmval[0] & FATTR4_WORD0_SIZE) {
406 u64 size;
407
408 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
409 return nfserr_bad_xdr;
410 iattr->ia_size = size;
411 iattr->ia_valid |= ATTR_SIZE;
412 }
413 if (bmval[0] & FATTR4_WORD0_ACL) {
414 status = nfsd4_decode_acl(argp, acl);
415 if (status)
416 return status;
417 } else
418 *acl = NULL;
419 if (bmval[1] & FATTR4_WORD1_MODE) {
420 u32 mode;
421
422 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
423 return nfserr_bad_xdr;
424 iattr->ia_mode = mode;
425 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
426 iattr->ia_valid |= ATTR_MODE;
427 }
428 if (bmval[1] & FATTR4_WORD1_OWNER) {
429 u32 length;
430
431 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
432 return nfserr_bad_xdr;
433 p = xdr_inline_decode(argp->xdr, length);
434 if (!p)
435 return nfserr_bad_xdr;
436 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
437 &iattr->ia_uid);
438 if (status)
439 return status;
440 iattr->ia_valid |= ATTR_UID;
441 }
442 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
443 u32 length;
444
445 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
446 return nfserr_bad_xdr;
447 p = xdr_inline_decode(argp->xdr, length);
448 if (!p)
449 return nfserr_bad_xdr;
450 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
451 &iattr->ia_gid);
452 if (status)
453 return status;
454 iattr->ia_valid |= ATTR_GID;
455 }
456 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
457 u32 set_it;
458
459 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
460 return nfserr_bad_xdr;
461 switch (set_it) {
462 case NFS4_SET_TO_CLIENT_TIME:
463 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
464 if (status)
465 return status;
466 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
467 break;
468 case NFS4_SET_TO_SERVER_TIME:
469 iattr->ia_valid |= ATTR_ATIME;
470 break;
471 default:
472 return nfserr_bad_xdr;
473 }
474 }
475 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
476 struct timespec64 ts;
477
478 /* No Linux filesystem supports setting this attribute. */
479 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
480 status = nfsd4_decode_nfstime4(argp, &ts);
481 if (status)
482 return status;
483 }
484 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
485 u32 set_it;
486
487 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
488 return nfserr_bad_xdr;
489 switch (set_it) {
490 case NFS4_SET_TO_CLIENT_TIME:
491 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
492 if (status)
493 return status;
494 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
495 break;
496 case NFS4_SET_TO_SERVER_TIME:
497 iattr->ia_valid |= ATTR_MTIME;
498 break;
499 default:
500 return nfserr_bad_xdr;
501 }
502 }
503 label->len = 0;
504 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
505 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
506 status = nfsd4_decode_security_label(argp, label);
507 if (status)
508 return status;
509 }
510 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
511 u32 mode, mask;
512
513 if (!umask)
514 return nfserr_bad_xdr;
515 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
516 return nfserr_bad_xdr;
517 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
518 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
519 return nfserr_bad_xdr;
520 *umask = mask & S_IRWXUGO;
521 iattr->ia_valid |= ATTR_MODE;
522 }
523
524 /* request sanity: did attrlist4 contain the expected number of words? */
525 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
526 return nfserr_bad_xdr;
527
528 return nfs_ok;
529 }
530
531 static __be32
532 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
533 {
534 __be32 *p;
535
536 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
537 if (!p)
538 return nfserr_bad_xdr;
539 sid->si_generation = be32_to_cpup(p++);
540 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
541 return nfs_ok;
542 }
543
544 static __be32
545 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
546 {
547 __be32 *p;
548
549 p = xdr_inline_decode(argp->xdr, sizeof(__be64));
550 if (!p)
551 return nfserr_bad_xdr;
552 memcpy(clientid, p, sizeof(*clientid));
553 return nfs_ok;
554 }
555
556 static __be32
557 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
558 clientid_t *clientid, struct xdr_netobj *owner)
559 {
560 __be32 status;
561
562 status = nfsd4_decode_clientid4(argp, clientid);
563 if (status)
564 return status;
565 return nfsd4_decode_opaque(argp, owner);
566 }
567
568 #ifdef CONFIG_NFSD_PNFS
569 static __be32
570 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
571 struct nfsd4_deviceid *devid)
572 {
573 __be32 *p;
574
575 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
576 if (!p)
577 return nfserr_bad_xdr;
578 memcpy(devid, p, sizeof(*devid));
579 return nfs_ok;
580 }
581
582 static __be32
583 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
584 struct nfsd4_layoutcommit *lcp)
585 {
586 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
587 return nfserr_bad_xdr;
588 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
589 return nfserr_bad_xdr;
590 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
591 return nfserr_bad_xdr;
592
593 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
594 return nfserr_bad_xdr;
595 if (lcp->lc_up_len > 0) {
596 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
597 if (!lcp->lc_up_layout)
598 return nfserr_bad_xdr;
599 }
600
601 return nfs_ok;
602 }
603
604 static __be32
605 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
606 struct nfsd4_layoutreturn *lrp)
607 {
608 __be32 status;
609
610 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
611 return nfserr_bad_xdr;
612 switch (lrp->lr_return_type) {
613 case RETURN_FILE:
614 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
615 return nfserr_bad_xdr;
616 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
617 return nfserr_bad_xdr;
618 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
619 if (status)
620 return status;
621 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
622 return nfserr_bad_xdr;
623 if (lrp->lrf_body_len > 0) {
624 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
625 if (!lrp->lrf_body)
626 return nfserr_bad_xdr;
627 }
628 break;
629 case RETURN_FSID:
630 case RETURN_ALL:
631 lrp->lr_seg.offset = 0;
632 lrp->lr_seg.length = NFS4_MAX_UINT64;
633 break;
634 default:
635 return nfserr_bad_xdr;
636 }
637
638 return nfs_ok;
639 }
640
641 #endif /* CONFIG_NFSD_PNFS */
642
643 static __be32
644 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
645 struct nfs4_sessionid *sessionid)
646 {
647 __be32 *p;
648
649 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
650 if (!p)
651 return nfserr_bad_xdr;
652 memcpy(sessionid->data, p, sizeof(sessionid->data));
653 return nfs_ok;
654 }
655
656 /* Defined in Appendix A of RFC 5531 */
657 static __be32
658 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
659 struct nfsd4_cb_sec *cbs)
660 {
661 u32 stamp, gidcount, uid, gid;
662 __be32 *p, status;
663
664 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
665 return nfserr_bad_xdr;
666 /* machine name */
667 status = nfsd4_decode_ignored_string(argp, 255);
668 if (status)
669 return status;
670 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
671 return nfserr_bad_xdr;
672 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
673 return nfserr_bad_xdr;
674 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
675 return nfserr_bad_xdr;
676 if (gidcount > 16)
677 return nfserr_bad_xdr;
678 p = xdr_inline_decode(argp->xdr, gidcount << 2);
679 if (!p)
680 return nfserr_bad_xdr;
681 if (cbs->flavor == (u32)(-1)) {
682 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
683
684 kuid_t kuid = make_kuid(userns, uid);
685 kgid_t kgid = make_kgid(userns, gid);
686 if (uid_valid(kuid) && gid_valid(kgid)) {
687 cbs->uid = kuid;
688 cbs->gid = kgid;
689 cbs->flavor = RPC_AUTH_UNIX;
690 } else {
691 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
692 }
693 }
694
695 return nfs_ok;
696 }
697
698 static __be32
699 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
700 struct nfsd4_cb_sec *cbs)
701 {
702 __be32 status;
703 u32 service;
704
705 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
706
707 if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
708 return nfserr_bad_xdr;
709 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
710 return nfserr_bad_xdr;
711 /* gcbp_handle_from_server */
712 status = nfsd4_decode_ignored_string(argp, 0);
713 if (status)
714 return status;
715 /* gcbp_handle_from_client */
716 status = nfsd4_decode_ignored_string(argp, 0);
717 if (status)
718 return status;
719
720 return nfs_ok;
721 }
722
723 /* a counted array of callback_sec_parms4 items */
724 static __be32
725 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
726 {
727 u32 i, secflavor, nr_secflavs;
728 __be32 status;
729
730 /* callback_sec_params4 */
731 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
732 return nfserr_bad_xdr;
733 if (nr_secflavs)
734 cbs->flavor = (u32)(-1);
735 else
736 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
737 cbs->flavor = 0;
738
739 for (i = 0; i < nr_secflavs; ++i) {
740 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
741 return nfserr_bad_xdr;
742 switch (secflavor) {
743 case RPC_AUTH_NULL:
744 /* void */
745 if (cbs->flavor == (u32)(-1))
746 cbs->flavor = RPC_AUTH_NULL;
747 break;
748 case RPC_AUTH_UNIX:
749 status = nfsd4_decode_authsys_parms(argp, cbs);
750 if (status)
751 return status;
752 break;
753 case RPC_AUTH_GSS:
754 status = nfsd4_decode_gss_cb_handles4(argp, cbs);
755 if (status)
756 return status;
757 break;
758 default:
759 return nfserr_inval;
760 }
761 }
762
763 return nfs_ok;
764 }
765
766
767 /*
768 * NFSv4 operation argument decoders
769 */
770
771 static __be32
772 nfsd4_decode_access(struct nfsd4_compoundargs *argp,
773 union nfsd4_op_u *u)
774 {
775 struct nfsd4_access *access = &u->access;
776 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
777 return nfserr_bad_xdr;
778 return nfs_ok;
779 }
780
781 static __be32
782 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
783 {
784 struct nfsd4_close *close = &u->close;
785 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
786 return nfserr_bad_xdr;
787 return nfsd4_decode_stateid4(argp, &close->cl_stateid);
788 }
789
790
791 static __be32
792 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
793 {
794 struct nfsd4_commit *commit = &u->commit;
795 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
796 return nfserr_bad_xdr;
797 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
798 return nfserr_bad_xdr;
799 memset(&commit->co_verf, 0, sizeof(commit->co_verf));
800 return nfs_ok;
801 }
802
803 static __be32
804 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
805 {
806 struct nfsd4_create *create = &u->create;
807 __be32 *p, status;
808
809 memset(create, 0, sizeof(*create));
810 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
811 return nfserr_bad_xdr;
812 switch (create->cr_type) {
813 case NF4LNK:
814 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
815 return nfserr_bad_xdr;
816 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
817 if (!p)
818 return nfserr_bad_xdr;
819 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
820 if (!create->cr_data)
821 return nfserr_jukebox;
822 break;
823 case NF4BLK:
824 case NF4CHR:
825 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
826 return nfserr_bad_xdr;
827 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
828 return nfserr_bad_xdr;
829 break;
830 case NF4SOCK:
831 case NF4FIFO:
832 case NF4DIR:
833 default:
834 break;
835 }
836 status = nfsd4_decode_component4(argp, &create->cr_name,
837 &create->cr_namelen);
838 if (status)
839 return status;
840 status = nfsd4_decode_fattr4(argp, create->cr_bmval,
841 ARRAY_SIZE(create->cr_bmval),
842 &create->cr_iattr, &create->cr_acl,
843 &create->cr_label, &create->cr_umask);
844 if (status)
845 return status;
846
847 return nfs_ok;
848 }
849
850 static inline __be32
851 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
852 {
853 struct nfsd4_delegreturn *dr = &u->delegreturn;
854 return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
855 }
856
857 static inline __be32
858 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
859 {
860 struct nfsd4_getattr *getattr = &u->getattr;
861 memset(getattr, 0, sizeof(*getattr));
862 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
863 ARRAY_SIZE(getattr->ga_bmval));
864 }
865
866 static __be32
867 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
868 {
869 struct nfsd4_link *link = &u->link;
870 memset(link, 0, sizeof(*link));
871 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
872 }
873
874 static __be32
875 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
876 struct nfsd4_lock *lock)
877 {
878 __be32 status;
879
880 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
881 return nfserr_bad_xdr;
882 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
883 if (status)
884 return status;
885 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
886 return nfserr_bad_xdr;
887 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
888 &lock->lk_new_owner);
889 }
890
891 static __be32
892 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
893 struct nfsd4_lock *lock)
894 {
895 __be32 status;
896
897 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
898 if (status)
899 return status;
900 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
901 return nfserr_bad_xdr;
902
903 return nfs_ok;
904 }
905
906 static __be32
907 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
908 {
909 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
910 return nfserr_bad_xdr;
911 if (lock->lk_is_new)
912 return nfsd4_decode_open_to_lock_owner4(argp, lock);
913 return nfsd4_decode_exist_lock_owner4(argp, lock);
914 }
915
916 static __be32
917 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
918 {
919 struct nfsd4_lock *lock = &u->lock;
920 memset(lock, 0, sizeof(*lock));
921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
922 return nfserr_bad_xdr;
923 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
924 return nfserr_bad_xdr;
925 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
926 return nfserr_bad_xdr;
927 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
928 return nfserr_bad_xdr;
929 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
930 return nfserr_bad_xdr;
931 return nfsd4_decode_locker4(argp, lock);
932 }
933
934 static __be32
935 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
936 {
937 struct nfsd4_lockt *lockt = &u->lockt;
938 memset(lockt, 0, sizeof(*lockt));
939 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
940 return nfserr_bad_xdr;
941 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
942 return nfserr_bad_xdr;
943 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
944 return nfserr_bad_xdr;
945 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
946 return nfserr_bad_xdr;
947 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
948 &lockt->lt_owner);
949 }
950
951 static __be32
952 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
953 {
954 struct nfsd4_locku *locku = &u->locku;
955 __be32 status;
956
957 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
958 return nfserr_bad_xdr;
959 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
960 return nfserr_bad_xdr;
961 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
962 return nfserr_bad_xdr;
963 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
964 if (status)
965 return status;
966 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
967 return nfserr_bad_xdr;
968 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
969 return nfserr_bad_xdr;
970
971 return nfs_ok;
972 }
973
974 static __be32
975 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
976 {
977 struct nfsd4_lookup *lookup = &u->lookup;
978 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
979 }
980
981 static __be32
982 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
983 {
984 __be32 status;
985
986 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
987 return nfserr_bad_xdr;
988 switch (open->op_createmode) {
989 case NFS4_CREATE_UNCHECKED:
990 case NFS4_CREATE_GUARDED:
991 status = nfsd4_decode_fattr4(argp, open->op_bmval,
992 ARRAY_SIZE(open->op_bmval),
993 &open->op_iattr, &open->op_acl,
994 &open->op_label, &open->op_umask);
995 if (status)
996 return status;
997 break;
998 case NFS4_CREATE_EXCLUSIVE:
999 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1000 if (status)
1001 return status;
1002 break;
1003 case NFS4_CREATE_EXCLUSIVE4_1:
1004 if (argp->minorversion < 1)
1005 return nfserr_bad_xdr;
1006 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1007 if (status)
1008 return status;
1009 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1010 ARRAY_SIZE(open->op_bmval),
1011 &open->op_iattr, &open->op_acl,
1012 &open->op_label, &open->op_umask);
1013 if (status)
1014 return status;
1015 break;
1016 default:
1017 return nfserr_bad_xdr;
1018 }
1019
1020 return nfs_ok;
1021 }
1022
1023 static __be32
1024 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1025 {
1026 __be32 status;
1027
1028 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1029 return nfserr_bad_xdr;
1030 switch (open->op_create) {
1031 case NFS4_OPEN_NOCREATE:
1032 break;
1033 case NFS4_OPEN_CREATE:
1034 status = nfsd4_decode_createhow4(argp, open);
1035 if (status)
1036 return status;
1037 break;
1038 default:
1039 return nfserr_bad_xdr;
1040 }
1041
1042 return nfs_ok;
1043 }
1044
1045 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1046 {
1047 u32 w;
1048
1049 if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1050 return nfserr_bad_xdr;
1051 *share_access = w & NFS4_SHARE_ACCESS_MASK;
1052 *deleg_want = w & NFS4_SHARE_WANT_MASK;
1053 if (deleg_when)
1054 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1055
1056 switch (w & NFS4_SHARE_ACCESS_MASK) {
1057 case NFS4_SHARE_ACCESS_READ:
1058 case NFS4_SHARE_ACCESS_WRITE:
1059 case NFS4_SHARE_ACCESS_BOTH:
1060 break;
1061 default:
1062 return nfserr_bad_xdr;
1063 }
1064 w &= ~NFS4_SHARE_ACCESS_MASK;
1065 if (!w)
1066 return nfs_ok;
1067 if (!argp->minorversion)
1068 return nfserr_bad_xdr;
1069 switch (w & NFS4_SHARE_WANT_MASK) {
1070 case NFS4_SHARE_WANT_NO_PREFERENCE:
1071 case NFS4_SHARE_WANT_READ_DELEG:
1072 case NFS4_SHARE_WANT_WRITE_DELEG:
1073 case NFS4_SHARE_WANT_ANY_DELEG:
1074 case NFS4_SHARE_WANT_NO_DELEG:
1075 case NFS4_SHARE_WANT_CANCEL:
1076 break;
1077 default:
1078 return nfserr_bad_xdr;
1079 }
1080 w &= ~NFS4_SHARE_WANT_MASK;
1081 if (!w)
1082 return nfs_ok;
1083
1084 if (!deleg_when) /* open_downgrade */
1085 return nfserr_inval;
1086 switch (w) {
1087 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1088 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1089 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1090 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1091 return nfs_ok;
1092 }
1093 return nfserr_bad_xdr;
1094 }
1095
1096 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1097 {
1098 if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1099 return nfserr_bad_xdr;
1100 /* Note: unlike access bits, deny bits may be zero. */
1101 if (*x & ~NFS4_SHARE_DENY_BOTH)
1102 return nfserr_bad_xdr;
1103
1104 return nfs_ok;
1105 }
1106
1107 static __be32
1108 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1109 struct nfsd4_open *open)
1110 {
1111 __be32 status;
1112
1113 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1114 return nfserr_bad_xdr;
1115 switch (open->op_claim_type) {
1116 case NFS4_OPEN_CLAIM_NULL:
1117 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1118 status = nfsd4_decode_component4(argp, &open->op_fname,
1119 &open->op_fnamelen);
1120 if (status)
1121 return status;
1122 break;
1123 case NFS4_OPEN_CLAIM_PREVIOUS:
1124 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1125 return nfserr_bad_xdr;
1126 break;
1127 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1128 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1129 if (status)
1130 return status;
1131 status = nfsd4_decode_component4(argp, &open->op_fname,
1132 &open->op_fnamelen);
1133 if (status)
1134 return status;
1135 break;
1136 case NFS4_OPEN_CLAIM_FH:
1137 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1138 if (argp->minorversion < 1)
1139 return nfserr_bad_xdr;
1140 /* void */
1141 break;
1142 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1143 if (argp->minorversion < 1)
1144 return nfserr_bad_xdr;
1145 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1146 if (status)
1147 return status;
1148 break;
1149 default:
1150 return nfserr_bad_xdr;
1151 }
1152
1153 return nfs_ok;
1154 }
1155
1156 static __be32
1157 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1158 {
1159 struct nfsd4_open *open = &u->open;
1160 __be32 status;
1161 u32 dummy;
1162
1163 memset(open, 0, sizeof(*open));
1164
1165 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1166 return nfserr_bad_xdr;
1167 /* deleg_want is ignored */
1168 status = nfsd4_decode_share_access(argp, &open->op_share_access,
1169 &open->op_deleg_want, &dummy);
1170 if (status)
1171 return status;
1172 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1173 if (status)
1174 return status;
1175 status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1176 &open->op_owner);
1177 if (status)
1178 return status;
1179 status = nfsd4_decode_openflag4(argp, open);
1180 if (status)
1181 return status;
1182 return nfsd4_decode_open_claim4(argp, open);
1183 }
1184
1185 static __be32
1186 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1187 union nfsd4_op_u *u)
1188 {
1189 struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1190 __be32 status;
1191
1192 if (argp->minorversion >= 1)
1193 return nfserr_notsupp;
1194
1195 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1196 if (status)
1197 return status;
1198 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1199 return nfserr_bad_xdr;
1200
1201 memset(&open_conf->oc_resp_stateid, 0,
1202 sizeof(open_conf->oc_resp_stateid));
1203 return nfs_ok;
1204 }
1205
1206 static __be32
1207 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1208 union nfsd4_op_u *u)
1209 {
1210 struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1211 __be32 status;
1212
1213 memset(open_down, 0, sizeof(*open_down));
1214 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1215 if (status)
1216 return status;
1217 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1218 return nfserr_bad_xdr;
1219 /* deleg_want is ignored */
1220 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1221 &open_down->od_deleg_want, NULL);
1222 if (status)
1223 return status;
1224 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1225 }
1226
1227 static __be32
1228 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1229 {
1230 struct nfsd4_putfh *putfh = &u->putfh;
1231 __be32 *p;
1232
1233 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1234 return nfserr_bad_xdr;
1235 if (putfh->pf_fhlen > NFS4_FHSIZE)
1236 return nfserr_bad_xdr;
1237 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1238 if (!p)
1239 return nfserr_bad_xdr;
1240 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1241 if (!putfh->pf_fhval)
1242 return nfserr_jukebox;
1243
1244 putfh->no_verify = false;
1245 return nfs_ok;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1250 {
1251 struct nfsd4_read *read = &u->read;
1252 __be32 status;
1253
1254 memset(read, 0, sizeof(*read));
1255 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1256 if (status)
1257 return status;
1258 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1259 return nfserr_bad_xdr;
1260 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1261 return nfserr_bad_xdr;
1262
1263 return nfs_ok;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1268 {
1269 struct nfsd4_readdir *readdir = &u->readdir;
1270 __be32 status;
1271
1272 memset(readdir, 0, sizeof(*readdir));
1273 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1274 return nfserr_bad_xdr;
1275 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1276 if (status)
1277 return status;
1278 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1279 return nfserr_bad_xdr;
1280 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1281 return nfserr_bad_xdr;
1282 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1283 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1284 return nfserr_bad_xdr;
1285
1286 return nfs_ok;
1287 }
1288
1289 static __be32
1290 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1291 {
1292 struct nfsd4_remove *remove = &u->remove;
1293 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1294 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1295 }
1296
1297 static __be32
1298 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299 {
1300 struct nfsd4_rename *rename = &u->rename;
1301 __be32 status;
1302
1303 memset(rename, 0, sizeof(*rename));
1304 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1305 if (status)
1306 return status;
1307 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1308 }
1309
1310 static __be32
1311 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1312 {
1313 clientid_t *clientid = &u->renew;
1314 return nfsd4_decode_clientid4(argp, clientid);
1315 }
1316
1317 static __be32
1318 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1319 union nfsd4_op_u *u)
1320 {
1321 struct nfsd4_secinfo *secinfo = &u->secinfo;
1322 secinfo->si_exp = NULL;
1323 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1324 }
1325
1326 static __be32
1327 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1328 {
1329 struct nfsd4_setattr *setattr = &u->setattr;
1330 __be32 status;
1331
1332 memset(setattr, 0, sizeof(*setattr));
1333 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1334 if (status)
1335 return status;
1336 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1337 ARRAY_SIZE(setattr->sa_bmval),
1338 &setattr->sa_iattr, &setattr->sa_acl,
1339 &setattr->sa_label, NULL);
1340 }
1341
1342 static __be32
1343 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1344 {
1345 struct nfsd4_setclientid *setclientid = &u->setclientid;
1346 __be32 *p, status;
1347
1348 memset(setclientid, 0, sizeof(*setclientid));
1349
1350 if (argp->minorversion >= 1)
1351 return nfserr_notsupp;
1352
1353 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1354 if (status)
1355 return status;
1356 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1357 if (status)
1358 return status;
1359 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1360 return nfserr_bad_xdr;
1361 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1362 return nfserr_bad_xdr;
1363 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1364 if (!p)
1365 return nfserr_bad_xdr;
1366 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1367 setclientid->se_callback_netid_len);
1368 if (!setclientid->se_callback_netid_val)
1369 return nfserr_jukebox;
1370
1371 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1372 return nfserr_bad_xdr;
1373 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1374 if (!p)
1375 return nfserr_bad_xdr;
1376 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1377 setclientid->se_callback_addr_len);
1378 if (!setclientid->se_callback_addr_val)
1379 return nfserr_jukebox;
1380 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1381 return nfserr_bad_xdr;
1382
1383 return nfs_ok;
1384 }
1385
1386 static __be32
1387 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1388 union nfsd4_op_u *u)
1389 {
1390 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1391 __be32 status;
1392
1393 if (argp->minorversion >= 1)
1394 return nfserr_notsupp;
1395
1396 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1397 if (status)
1398 return status;
1399 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1400 }
1401
1402 /* Also used for NVERIFY */
1403 static __be32
1404 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1405 {
1406 struct nfsd4_verify *verify = &u->verify;
1407 __be32 *p, status;
1408
1409 memset(verify, 0, sizeof(*verify));
1410
1411 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1412 ARRAY_SIZE(verify->ve_bmval));
1413 if (status)
1414 return status;
1415
1416 /* For convenience's sake, we compare raw xdr'd attributes in
1417 * nfsd4_proc_verify */
1418
1419 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1420 return nfserr_bad_xdr;
1421 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1422 if (!p)
1423 return nfserr_bad_xdr;
1424 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1425 if (!verify->ve_attrval)
1426 return nfserr_jukebox;
1427
1428 return nfs_ok;
1429 }
1430
1431 static __be32
1432 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1433 {
1434 struct nfsd4_write *write = &u->write;
1435 __be32 status;
1436
1437 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1438 if (status)
1439 return status;
1440 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1441 return nfserr_bad_xdr;
1442 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1443 return nfserr_bad_xdr;
1444 if (write->wr_stable_how > NFS_FILE_SYNC)
1445 return nfserr_bad_xdr;
1446 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1447 return nfserr_bad_xdr;
1448 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1449 return nfserr_bad_xdr;
1450
1451 write->wr_bytes_written = 0;
1452 write->wr_how_written = 0;
1453 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1454 return nfs_ok;
1455 }
1456
1457 static __be32
1458 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1459 union nfsd4_op_u *u)
1460 {
1461 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1462 __be32 status;
1463
1464 if (argp->minorversion >= 1)
1465 return nfserr_notsupp;
1466
1467 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1468 &rlockowner->rl_owner);
1469 if (status)
1470 return status;
1471
1472 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1473 return nfserr_inval;
1474
1475 return nfs_ok;
1476 }
1477
1478 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1479 union nfsd4_op_u *u)
1480 {
1481 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1482 memset(bc, 0, sizeof(*bc));
1483 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1484 return nfserr_bad_xdr;
1485 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1486 }
1487
1488 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1489 union nfsd4_op_u *u)
1490 {
1491 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1492 u32 use_conn_in_rdma_mode;
1493 __be32 status;
1494
1495 memset(bcts, 0, sizeof(*bcts));
1496 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1497 if (status)
1498 return status;
1499 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1500 return nfserr_bad_xdr;
1501 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1502 return nfserr_bad_xdr;
1503
1504 return nfs_ok;
1505 }
1506
1507 static __be32
1508 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1509 struct nfsd4_exchange_id *exid)
1510 {
1511 __be32 status;
1512
1513 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1514 ARRAY_SIZE(exid->spo_must_enforce));
1515 if (status)
1516 return nfserr_bad_xdr;
1517 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1518 ARRAY_SIZE(exid->spo_must_allow));
1519 if (status)
1520 return nfserr_bad_xdr;
1521
1522 return nfs_ok;
1523 }
1524
1525 /*
1526 * This implementation currently does not support SP4_SSV.
1527 * This decoder simply skips over these arguments.
1528 */
1529 static noinline __be32
1530 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1531 struct nfsd4_exchange_id *exid)
1532 {
1533 u32 count, window, num_gss_handles;
1534 __be32 status;
1535
1536 /* ssp_ops */
1537 status = nfsd4_decode_state_protect_ops(argp, exid);
1538 if (status)
1539 return status;
1540
1541 /* ssp_hash_algs<> */
1542 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1543 return nfserr_bad_xdr;
1544 while (count--) {
1545 status = nfsd4_decode_ignored_string(argp, 0);
1546 if (status)
1547 return status;
1548 }
1549
1550 /* ssp_encr_algs<> */
1551 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1552 return nfserr_bad_xdr;
1553 while (count--) {
1554 status = nfsd4_decode_ignored_string(argp, 0);
1555 if (status)
1556 return status;
1557 }
1558
1559 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1560 return nfserr_bad_xdr;
1561 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1562 return nfserr_bad_xdr;
1563
1564 return nfs_ok;
1565 }
1566
1567 static __be32
1568 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1569 struct nfsd4_exchange_id *exid)
1570 {
1571 __be32 status;
1572
1573 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1574 return nfserr_bad_xdr;
1575 switch (exid->spa_how) {
1576 case SP4_NONE:
1577 break;
1578 case SP4_MACH_CRED:
1579 status = nfsd4_decode_state_protect_ops(argp, exid);
1580 if (status)
1581 return status;
1582 break;
1583 case SP4_SSV:
1584 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1585 if (status)
1586 return status;
1587 break;
1588 default:
1589 return nfserr_bad_xdr;
1590 }
1591
1592 return nfs_ok;
1593 }
1594
1595 static __be32
1596 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1597 struct nfsd4_exchange_id *exid)
1598 {
1599 __be32 status;
1600 u32 count;
1601
1602 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1603 return nfserr_bad_xdr;
1604 switch (count) {
1605 case 0:
1606 break;
1607 case 1:
1608 /* Note that RFC 8881 places no length limit on
1609 * nii_domain, but this implementation permits no
1610 * more than NFS4_OPAQUE_LIMIT bytes */
1611 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1612 if (status)
1613 return status;
1614 /* Note that RFC 8881 places no length limit on
1615 * nii_name, but this implementation permits no
1616 * more than NFS4_OPAQUE_LIMIT bytes */
1617 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1618 if (status)
1619 return status;
1620 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1621 if (status)
1622 return status;
1623 break;
1624 default:
1625 return nfserr_bad_xdr;
1626 }
1627
1628 return nfs_ok;
1629 }
1630
1631 static __be32
1632 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1633 union nfsd4_op_u *u)
1634 {
1635 struct nfsd4_exchange_id *exid = &u->exchange_id;
1636 __be32 status;
1637
1638 memset(exid, 0, sizeof(*exid));
1639 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1640 if (status)
1641 return status;
1642 status = nfsd4_decode_opaque(argp, &exid->clname);
1643 if (status)
1644 return status;
1645 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1646 return nfserr_bad_xdr;
1647 status = nfsd4_decode_state_protect4_a(argp, exid);
1648 if (status)
1649 return status;
1650 return nfsd4_decode_nfs_impl_id4(argp, exid);
1651 }
1652
1653 static __be32
1654 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1655 struct nfsd4_channel_attrs *ca)
1656 {
1657 __be32 *p;
1658
1659 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1660 if (!p)
1661 return nfserr_bad_xdr;
1662
1663 /* headerpadsz is ignored */
1664 p++;
1665 ca->maxreq_sz = be32_to_cpup(p++);
1666 ca->maxresp_sz = be32_to_cpup(p++);
1667 ca->maxresp_cached = be32_to_cpup(p++);
1668 ca->maxops = be32_to_cpup(p++);
1669 ca->maxreqs = be32_to_cpup(p++);
1670 ca->nr_rdma_attrs = be32_to_cpup(p);
1671 switch (ca->nr_rdma_attrs) {
1672 case 0:
1673 break;
1674 case 1:
1675 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1676 return nfserr_bad_xdr;
1677 break;
1678 default:
1679 return nfserr_bad_xdr;
1680 }
1681
1682 return nfs_ok;
1683 }
1684
1685 static __be32
1686 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1687 union nfsd4_op_u *u)
1688 {
1689 struct nfsd4_create_session *sess = &u->create_session;
1690 __be32 status;
1691
1692 memset(sess, 0, sizeof(*sess));
1693 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1694 if (status)
1695 return status;
1696 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1697 return nfserr_bad_xdr;
1698 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1699 return nfserr_bad_xdr;
1700 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1701 if (status)
1702 return status;
1703 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1704 if (status)
1705 return status;
1706 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1707 return nfserr_bad_xdr;
1708 return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1709 }
1710
1711 static __be32
1712 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1713 union nfsd4_op_u *u)
1714 {
1715 struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1716 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1717 }
1718
1719 static __be32
1720 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1721 union nfsd4_op_u *u)
1722 {
1723 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1724 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1725 }
1726
1727 static __be32
1728 nfsd4_decode_get_dir_delegation(struct nfsd4_compoundargs *argp,
1729 union nfsd4_op_u *u)
1730 {
1731 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
1732 __be32 status;
1733
1734 memset(gdd, 0, sizeof(*gdd));
1735
1736 if (xdr_stream_decode_bool(argp->xdr, &gdd->gdda_signal_deleg_avail) < 0)
1737 return nfserr_bad_xdr;
1738 status = nfsd4_decode_bitmap4(argp, gdd->gdda_notification_types,
1739 ARRAY_SIZE(gdd->gdda_notification_types));
1740 if (status)
1741 return status;
1742 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_child_attr_delay);
1743 if (status)
1744 return status;
1745 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_dir_attr_delay);
1746 if (status)
1747 return status;
1748 status = nfsd4_decode_bitmap4(argp, gdd->gdda_child_attributes,
1749 ARRAY_SIZE(gdd->gdda_child_attributes));
1750 if (status)
1751 return status;
1752 return nfsd4_decode_bitmap4(argp, gdd->gdda_dir_attributes,
1753 ARRAY_SIZE(gdd->gdda_dir_attributes));
1754 }
1755
1756 #ifdef CONFIG_NFSD_PNFS
1757 static __be32
1758 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1759 union nfsd4_op_u *u)
1760 {
1761 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1762 __be32 status;
1763
1764 memset(gdev, 0, sizeof(*gdev));
1765 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1766 if (status)
1767 return status;
1768 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1769 return nfserr_bad_xdr;
1770 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1771 return nfserr_bad_xdr;
1772 if (xdr_stream_decode_uint32_array(argp->xdr,
1773 &gdev->gd_notify_types, 1) < 0)
1774 return nfserr_bad_xdr;
1775
1776 return nfs_ok;
1777 }
1778
1779 static __be32
1780 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1781 union nfsd4_op_u *u)
1782 {
1783 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1784 __be32 *p, status;
1785
1786 memset(lcp, 0, sizeof(*lcp));
1787 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1788 return nfserr_bad_xdr;
1789 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1790 return nfserr_bad_xdr;
1791 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1792 return nfserr_bad_xdr;
1793 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1794 if (status)
1795 return status;
1796 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1797 return nfserr_bad_xdr;
1798 if (lcp->lc_newoffset) {
1799 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1800 return nfserr_bad_xdr;
1801 } else
1802 lcp->lc_last_wr = 0;
1803 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1804 if (!p)
1805 return nfserr_bad_xdr;
1806 if (xdr_item_is_present(p)) {
1807 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1808 if (status)
1809 return status;
1810 } else {
1811 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1812 }
1813 return nfsd4_decode_layoutupdate4(argp, lcp);
1814 }
1815
1816 static __be32
1817 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1818 union nfsd4_op_u *u)
1819 {
1820 struct nfsd4_layoutget *lgp = &u->layoutget;
1821 __be32 status;
1822
1823 memset(lgp, 0, sizeof(*lgp));
1824 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1825 return nfserr_bad_xdr;
1826 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1827 return nfserr_bad_xdr;
1828 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1829 return nfserr_bad_xdr;
1830 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1831 return nfserr_bad_xdr;
1832 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1833 return nfserr_bad_xdr;
1834 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1835 return nfserr_bad_xdr;
1836 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1837 if (status)
1838 return status;
1839 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1840 return nfserr_bad_xdr;
1841
1842 return nfs_ok;
1843 }
1844
1845 static __be32
1846 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1847 union nfsd4_op_u *u)
1848 {
1849 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1850 memset(lrp, 0, sizeof(*lrp));
1851 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1852 return nfserr_bad_xdr;
1853 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1854 return nfserr_bad_xdr;
1855 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1856 return nfserr_bad_xdr;
1857 return nfsd4_decode_layoutreturn4(argp, lrp);
1858 }
1859 #endif /* CONFIG_NFSD_PNFS */
1860
1861 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1862 union nfsd4_op_u *u)
1863 {
1864 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1865 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1866 return nfserr_bad_xdr;
1867
1868 sin->sin_exp = NULL;
1869 return nfs_ok;
1870 }
1871
1872 static __be32
1873 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1874 union nfsd4_op_u *u)
1875 {
1876 struct nfsd4_sequence *seq = &u->sequence;
1877 __be32 *p, status;
1878
1879 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1880 if (status)
1881 return status;
1882 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1883 if (!p)
1884 return nfserr_bad_xdr;
1885 seq->seqid = be32_to_cpup(p++);
1886 seq->slotid = be32_to_cpup(p++);
1887 seq->maxslots = be32_to_cpup(p++);
1888 seq->cachethis = be32_to_cpup(p);
1889
1890 seq->status_flags = 0;
1891 return nfs_ok;
1892 }
1893
1894 static __be32
1895 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1896 union nfsd4_op_u *u)
1897 {
1898 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1899 struct nfsd4_test_stateid_id *stateid;
1900 __be32 status;
1901 u32 i;
1902
1903 memset(test_stateid, 0, sizeof(*test_stateid));
1904 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1905 return nfserr_bad_xdr;
1906
1907 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1908 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1909 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1910 if (!stateid)
1911 return nfserr_jukebox;
1912 INIT_LIST_HEAD(&stateid->ts_id_list);
1913 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1914 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1915 if (status)
1916 return status;
1917 }
1918
1919 return nfs_ok;
1920 }
1921
1922 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1923 union nfsd4_op_u *u)
1924 {
1925 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1926 return nfsd4_decode_clientid4(argp, &dc->clientid);
1927 }
1928
1929 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1930 union nfsd4_op_u *u)
1931 {
1932 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1933 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1934 return nfserr_bad_xdr;
1935 return nfs_ok;
1936 }
1937
1938 static __be32
1939 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1940 union nfsd4_op_u *u)
1941 {
1942 struct nfsd4_fallocate *fallocate = &u->allocate;
1943 __be32 status;
1944
1945 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1946 if (status)
1947 return status;
1948 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1949 return nfserr_bad_xdr;
1950 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1951 return nfserr_bad_xdr;
1952
1953 return nfs_ok;
1954 }
1955
1956 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1957 struct nl4_server *ns)
1958 {
1959 struct nfs42_netaddr *naddr;
1960 __be32 *p;
1961
1962 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1963 return nfserr_bad_xdr;
1964
1965 /* currently support for 1 inter-server source server */
1966 switch (ns->nl4_type) {
1967 case NL4_NETADDR:
1968 naddr = &ns->u.nl4_addr;
1969
1970 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1971 return nfserr_bad_xdr;
1972 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1973 return nfserr_bad_xdr;
1974
1975 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1976 if (!p)
1977 return nfserr_bad_xdr;
1978 memcpy(naddr->netid, p, naddr->netid_len);
1979
1980 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1981 return nfserr_bad_xdr;
1982 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1983 return nfserr_bad_xdr;
1984
1985 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1986 if (!p)
1987 return nfserr_bad_xdr;
1988 memcpy(naddr->addr, p, naddr->addr_len);
1989 break;
1990 default:
1991 return nfserr_bad_xdr;
1992 }
1993
1994 return nfs_ok;
1995 }
1996
1997 static __be32
1998 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1999 {
2000 struct nfsd4_copy *copy = &u->copy;
2001 u32 consecutive, i, count, sync;
2002 struct nl4_server *ns_dummy;
2003 __be32 status;
2004
2005 memset(copy, 0, sizeof(*copy));
2006 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid);
2007 if (status)
2008 return status;
2009 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid);
2010 if (status)
2011 return status;
2012 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0)
2013 return nfserr_bad_xdr;
2014 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0)
2015 return nfserr_bad_xdr;
2016 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0)
2017 return nfserr_bad_xdr;
2018 /* ca_consecutive: we always do consecutive copies */
2019 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
2020 return nfserr_bad_xdr;
2021 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2022 return nfserr_bad_xdr;
2023 nfsd4_copy_set_sync(copy, sync);
2024
2025 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2026 return nfserr_bad_xdr;
2027 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2028 if (copy->cp_src == NULL)
2029 return nfserr_jukebox;
2030 if (count == 0) { /* intra-server copy */
2031 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags);
2032 return nfs_ok;
2033 }
2034
2035 /* decode all the supplied server addresses but use only the first */
2036 status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2037 if (status)
2038 return status;
2039
2040 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2041 if (ns_dummy == NULL)
2042 return nfserr_jukebox;
2043 for (i = 0; i < count - 1; i++) {
2044 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2045 if (status) {
2046 kfree(ns_dummy);
2047 return status;
2048 }
2049 }
2050 kfree(ns_dummy);
2051
2052 return nfs_ok;
2053 }
2054
2055 static __be32
2056 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2057 union nfsd4_op_u *u)
2058 {
2059 struct nfsd4_copy_notify *cn = &u->copy_notify;
2060 __be32 status;
2061
2062 memset(cn, 0, sizeof(*cn));
2063 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2064 if (cn->cpn_src == NULL)
2065 return nfserr_jukebox;
2066 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2067 if (cn->cpn_dst == NULL)
2068 return nfserr_jukebox;
2069
2070 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2071 if (status)
2072 return status;
2073 return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2074 }
2075
2076 static __be32
2077 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2078 union nfsd4_op_u *u)
2079 {
2080 struct nfsd4_offload_status *os = &u->offload_status;
2081 os->count = 0;
2082 os->status = 0;
2083 return nfsd4_decode_stateid4(argp, &os->stateid);
2084 }
2085
2086 static __be32
2087 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2088 {
2089 struct nfsd4_seek *seek = &u->seek;
2090 __be32 status;
2091
2092 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2093 if (status)
2094 return status;
2095 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2096 return nfserr_bad_xdr;
2097 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2098 return nfserr_bad_xdr;
2099
2100 seek->seek_eof = 0;
2101 seek->seek_pos = 0;
2102 return nfs_ok;
2103 }
2104
2105 static __be32
2106 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2107 {
2108 struct nfsd4_clone *clone = &u->clone;
2109 __be32 status;
2110
2111 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2112 if (status)
2113 return status;
2114 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2115 if (status)
2116 return status;
2117 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2118 return nfserr_bad_xdr;
2119 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2120 return nfserr_bad_xdr;
2121 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2122 return nfserr_bad_xdr;
2123
2124 return nfs_ok;
2125 }
2126
2127 /*
2128 * XDR data that is more than PAGE_SIZE in size is normally part of a
2129 * read or write. However, the size of extended attributes is limited
2130 * by the maximum request size, and then further limited by the underlying
2131 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2132 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2133 * and we're not dealing with contiguous pages, we need to do some copying.
2134 */
2135
2136 /*
2137 * Decode data into buffer.
2138 */
2139 static __be32
2140 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2141 char **bufp, size_t buflen)
2142 {
2143 struct page **pages = xdr->pages;
2144 struct kvec *head = xdr->head;
2145 char *tmp, *dp;
2146 u32 len;
2147
2148 if (buflen <= head->iov_len) {
2149 /*
2150 * We're in luck, the head has enough space. Just return
2151 * the head, no need for copying.
2152 */
2153 *bufp = head->iov_base;
2154 return 0;
2155 }
2156
2157 tmp = svcxdr_tmpalloc(argp, buflen);
2158 if (tmp == NULL)
2159 return nfserr_jukebox;
2160
2161 dp = tmp;
2162 memcpy(dp, head->iov_base, head->iov_len);
2163 buflen -= head->iov_len;
2164 dp += head->iov_len;
2165
2166 while (buflen > 0) {
2167 len = min_t(u32, buflen, PAGE_SIZE);
2168 memcpy(dp, page_address(*pages), len);
2169
2170 buflen -= len;
2171 dp += len;
2172 pages++;
2173 }
2174
2175 *bufp = tmp;
2176 return 0;
2177 }
2178
2179 /*
2180 * Get a user extended attribute name from the XDR buffer.
2181 * It will not have the "user." prefix, so prepend it.
2182 * Lastly, check for nul characters in the name.
2183 */
2184 static __be32
2185 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2186 {
2187 char *name, *sp, *dp;
2188 u32 namelen, cnt;
2189 __be32 *p;
2190
2191 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2192 return nfserr_bad_xdr;
2193 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2194 return nfserr_nametoolong;
2195 if (namelen == 0)
2196 return nfserr_bad_xdr;
2197 p = xdr_inline_decode(argp->xdr, namelen);
2198 if (!p)
2199 return nfserr_bad_xdr;
2200 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2201 if (!name)
2202 return nfserr_jukebox;
2203 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2204
2205 /*
2206 * Copy the extended attribute name over while checking for 0
2207 * characters.
2208 */
2209 sp = (char *)p;
2210 dp = name + XATTR_USER_PREFIX_LEN;
2211 cnt = namelen;
2212
2213 while (cnt-- > 0) {
2214 if (*sp == '\0')
2215 return nfserr_bad_xdr;
2216 *dp++ = *sp++;
2217 }
2218 *dp = '\0';
2219
2220 *namep = name;
2221
2222 return nfs_ok;
2223 }
2224
2225 /*
2226 * A GETXATTR op request comes without a length specifier. We just set the
2227 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2228 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2229 * check it against getxa_len, and allocate + return the value.
2230 */
2231 static __be32
2232 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2233 union nfsd4_op_u *u)
2234 {
2235 struct nfsd4_getxattr *getxattr = &u->getxattr;
2236 __be32 status;
2237 u32 maxcount;
2238
2239 memset(getxattr, 0, sizeof(*getxattr));
2240 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2241 if (status)
2242 return status;
2243
2244 maxcount = svc_max_payload(argp->rqstp);
2245 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2246
2247 getxattr->getxa_len = maxcount;
2248 return nfs_ok;
2249 }
2250
2251 static __be32
2252 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2253 union nfsd4_op_u *u)
2254 {
2255 struct nfsd4_setxattr *setxattr = &u->setxattr;
2256 u32 flags, maxcount, size;
2257 __be32 status;
2258
2259 memset(setxattr, 0, sizeof(*setxattr));
2260
2261 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2262 return nfserr_bad_xdr;
2263
2264 if (flags > SETXATTR4_REPLACE)
2265 return nfserr_inval;
2266 setxattr->setxa_flags = flags;
2267
2268 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2269 if (status)
2270 return status;
2271
2272 maxcount = svc_max_payload(argp->rqstp);
2273 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2274
2275 if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2276 return nfserr_bad_xdr;
2277 if (size > maxcount)
2278 return nfserr_xattr2big;
2279
2280 setxattr->setxa_len = size;
2281 if (size > 0) {
2282 struct xdr_buf payload;
2283
2284 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2285 return nfserr_bad_xdr;
2286 status = nfsd4_vbuf_from_vector(argp, &payload,
2287 &setxattr->setxa_buf, size);
2288 }
2289
2290 return nfs_ok;
2291 }
2292
2293 static __be32
2294 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2295 union nfsd4_op_u *u)
2296 {
2297 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2298 u32 maxcount;
2299
2300 memset(listxattrs, 0, sizeof(*listxattrs));
2301
2302 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2303 return nfserr_bad_xdr;
2304
2305 /*
2306 * If the cookie is too large to have even one user.x attribute
2307 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2308 */
2309 if (listxattrs->lsxa_cookie >=
2310 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2311 return nfserr_badcookie;
2312
2313 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2314 return nfserr_bad_xdr;
2315 if (maxcount < 8)
2316 /* Always need at least 2 words (length and one character) */
2317 return nfserr_inval;
2318
2319 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2320 listxattrs->lsxa_maxcount = maxcount;
2321
2322 return nfs_ok;
2323 }
2324
2325 static __be32
2326 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2327 union nfsd4_op_u *u)
2328 {
2329 struct nfsd4_removexattr *removexattr = &u->removexattr;
2330 memset(removexattr, 0, sizeof(*removexattr));
2331 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2332 }
2333
2334 static __be32
2335 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2336 {
2337 return nfs_ok;
2338 }
2339
2340 static __be32
2341 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2342 {
2343 return nfserr_notsupp;
2344 }
2345
2346 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2347
2348 static const nfsd4_dec nfsd4_dec_ops[] = {
2349 [OP_ACCESS] = nfsd4_decode_access,
2350 [OP_CLOSE] = nfsd4_decode_close,
2351 [OP_COMMIT] = nfsd4_decode_commit,
2352 [OP_CREATE] = nfsd4_decode_create,
2353 [OP_DELEGPURGE] = nfsd4_decode_notsupp,
2354 [OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2355 [OP_GETATTR] = nfsd4_decode_getattr,
2356 [OP_GETFH] = nfsd4_decode_noop,
2357 [OP_LINK] = nfsd4_decode_link,
2358 [OP_LOCK] = nfsd4_decode_lock,
2359 [OP_LOCKT] = nfsd4_decode_lockt,
2360 [OP_LOCKU] = nfsd4_decode_locku,
2361 [OP_LOOKUP] = nfsd4_decode_lookup,
2362 [OP_LOOKUPP] = nfsd4_decode_noop,
2363 [OP_NVERIFY] = nfsd4_decode_verify,
2364 [OP_OPEN] = nfsd4_decode_open,
2365 [OP_OPENATTR] = nfsd4_decode_notsupp,
2366 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2367 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2368 [OP_PUTFH] = nfsd4_decode_putfh,
2369 [OP_PUTPUBFH] = nfsd4_decode_noop,
2370 [OP_PUTROOTFH] = nfsd4_decode_noop,
2371 [OP_READ] = nfsd4_decode_read,
2372 [OP_READDIR] = nfsd4_decode_readdir,
2373 [OP_READLINK] = nfsd4_decode_noop,
2374 [OP_REMOVE] = nfsd4_decode_remove,
2375 [OP_RENAME] = nfsd4_decode_rename,
2376 [OP_RENEW] = nfsd4_decode_renew,
2377 [OP_RESTOREFH] = nfsd4_decode_noop,
2378 [OP_SAVEFH] = nfsd4_decode_noop,
2379 [OP_SECINFO] = nfsd4_decode_secinfo,
2380 [OP_SETATTR] = nfsd4_decode_setattr,
2381 [OP_SETCLIENTID] = nfsd4_decode_setclientid,
2382 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2383 [OP_VERIFY] = nfsd4_decode_verify,
2384 [OP_WRITE] = nfsd4_decode_write,
2385 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2386
2387 /* new operations for NFSv4.1 */
2388 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2389 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2390 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2391 [OP_CREATE_SESSION] = nfsd4_decode_create_session,
2392 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2393 [OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2394 [OP_GET_DIR_DELEGATION] = nfsd4_decode_get_dir_delegation,
2395 #ifdef CONFIG_NFSD_PNFS
2396 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2397 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2398 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2399 [OP_LAYOUTGET] = nfsd4_decode_layoutget,
2400 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
2401 #else
2402 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2403 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2404 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2405 [OP_LAYOUTGET] = nfsd4_decode_notsupp,
2406 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
2407 #endif
2408 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2409 [OP_SEQUENCE] = nfsd4_decode_sequence,
2410 [OP_SET_SSV] = nfsd4_decode_notsupp,
2411 [OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2412 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2413 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2414 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
2415
2416 /* new operations for NFSv4.2 */
2417 [OP_ALLOCATE] = nfsd4_decode_fallocate,
2418 [OP_COPY] = nfsd4_decode_copy,
2419 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2420 [OP_DEALLOCATE] = nfsd4_decode_fallocate,
2421 [OP_IO_ADVISE] = nfsd4_decode_notsupp,
2422 [OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2423 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2424 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2425 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2426 [OP_READ_PLUS] = nfsd4_decode_read,
2427 [OP_SEEK] = nfsd4_decode_seek,
2428 [OP_WRITE_SAME] = nfsd4_decode_notsupp,
2429 [OP_CLONE] = nfsd4_decode_clone,
2430 /* RFC 8276 extended atributes operations */
2431 [OP_GETXATTR] = nfsd4_decode_getxattr,
2432 [OP_SETXATTR] = nfsd4_decode_setxattr,
2433 [OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2434 [OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2435 };
2436
2437 static inline bool
2438 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2439 {
2440 if (op->opnum < FIRST_NFS4_OP)
2441 return false;
2442 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2443 return false;
2444 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2445 return false;
2446 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2447 return false;
2448 return true;
2449 }
2450
2451 static bool
2452 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2453 {
2454 struct nfsd4_op *op;
2455 bool cachethis = false;
2456 int auth_slack= argp->rqstp->rq_auth_slack;
2457 int max_reply = auth_slack + 8; /* opcnt, status */
2458 int readcount = 0;
2459 int readbytes = 0;
2460 __be32 *p;
2461 int i;
2462
2463 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2464 return false;
2465 max_reply += XDR_UNIT;
2466 argp->tag = NULL;
2467 if (unlikely(argp->taglen)) {
2468 if (argp->taglen > NFSD4_MAX_TAGLEN)
2469 return false;
2470 p = xdr_inline_decode(argp->xdr, argp->taglen);
2471 if (!p)
2472 return false;
2473 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2474 if (!argp->tag)
2475 return false;
2476 max_reply += xdr_align_size(argp->taglen);
2477 }
2478
2479 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2480 return false;
2481 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2482 return false;
2483 argp->opcnt = min_t(u32, argp->client_opcnt,
2484 NFSD_MAX_OPS_PER_COMPOUND);
2485
2486 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2487 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2488 if (!argp->ops) {
2489 argp->ops = argp->iops;
2490 return false;
2491 }
2492 }
2493
2494 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2495 argp->opcnt = 0;
2496
2497 for (i = 0; i < argp->opcnt; i++) {
2498 op = &argp->ops[i];
2499 op->replay = NULL;
2500 op->opdesc = NULL;
2501
2502 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2503 return false;
2504 if (nfsd4_opnum_in_range(argp, op)) {
2505 op->opdesc = OPDESC(op);
2506 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2507 if (op->status != nfs_ok)
2508 trace_nfsd_compound_decode_err(argp->rqstp,
2509 argp->opcnt, i,
2510 op->opnum,
2511 op->status);
2512 } else {
2513 op->opnum = OP_ILLEGAL;
2514 op->status = nfserr_op_illegal;
2515 }
2516
2517 /*
2518 * We'll try to cache the result in the DRC if any one
2519 * op in the compound wants to be cached:
2520 */
2521 cachethis |= nfsd4_cache_this_op(op);
2522
2523 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2524 readcount++;
2525 readbytes += nfsd4_max_reply(argp->rqstp, op);
2526 } else
2527 max_reply += nfsd4_max_reply(argp->rqstp, op);
2528 /*
2529 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2530 * (Special case because it will just skip encoding this
2531 * if it runs out of xdr buffer space, and it is the only
2532 * operation that behaves this way.)
2533 */
2534 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2535 max_reply += NFS4_OPAQUE_LIMIT;
2536
2537 if (op->status) {
2538 argp->opcnt = i+1;
2539 break;
2540 }
2541 }
2542 /* Sessions make the DRC unnecessary: */
2543 if (argp->minorversion)
2544 cachethis = false;
2545 svc_reserve(argp->rqstp, max_reply + readbytes);
2546 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2547
2548 argp->splice_ok = nfsd_read_splice_ok(argp->rqstp);
2549 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2550 argp->splice_ok = false;
2551
2552 return true;
2553 }
2554
2555 static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr,
2556 struct knfsd_fh *fh_handle)
2557 {
2558 return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size);
2559 }
2560
2561 /* This is a frequently-encoded type; open-coded for speed */
2562 static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2563 const struct timespec64 *tv)
2564 {
2565 __be32 *p;
2566
2567 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2568 if (!p)
2569 return nfserr_resource;
2570 p = xdr_encode_hyper(p, tv->tv_sec);
2571 *p = cpu_to_be32(tv->tv_nsec);
2572 return nfs_ok;
2573 }
2574
2575 static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr,
2576 unsigned int major, unsigned int minor)
2577 {
2578 __be32 status;
2579
2580 status = nfsd4_encode_uint32_t(xdr, major);
2581 if (status != nfs_ok)
2582 return status;
2583 return nfsd4_encode_uint32_t(xdr, minor);
2584 }
2585
2586 static __be32
2587 nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c)
2588 {
2589 __be32 status;
2590
2591 status = nfsd4_encode_bool(xdr, c->atomic);
2592 if (status != nfs_ok)
2593 return status;
2594 status = nfsd4_encode_changeid4(xdr, c->before_change);
2595 if (status != nfs_ok)
2596 return status;
2597 return nfsd4_encode_changeid4(xdr, c->after_change);
2598 }
2599
2600 static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr,
2601 const struct nfs42_netaddr *addr)
2602 {
2603 __be32 status;
2604
2605 /* na_r_netid */
2606 status = nfsd4_encode_opaque(xdr, addr->netid, addr->netid_len);
2607 if (status != nfs_ok)
2608 return status;
2609 /* na_r_addr */
2610 return nfsd4_encode_opaque(xdr, addr->addr, addr->addr_len);
2611 }
2612
2613 /* Encode as an array of strings the string given with components
2614 * separated @sep, escaped with esc_enter and esc_exit.
2615 */
2616 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2617 char *components, char esc_enter,
2618 char esc_exit)
2619 {
2620 __be32 *p;
2621 __be32 pathlen;
2622 int pathlen_offset;
2623 int strlen, count=0;
2624 char *str, *end, *next;
2625
2626 dprintk("nfsd4_encode_components(%s)\n", components);
2627
2628 pathlen_offset = xdr->buf->len;
2629 p = xdr_reserve_space(xdr, 4);
2630 if (!p)
2631 return nfserr_resource;
2632 p++; /* We will fill this in with @count later */
2633
2634 end = str = components;
2635 while (*end) {
2636 bool found_esc = false;
2637
2638 /* try to parse as esc_start, ..., esc_end, sep */
2639 if (*str == esc_enter) {
2640 for (; *end && (*end != esc_exit); end++)
2641 /* find esc_exit or end of string */;
2642 next = end + 1;
2643 if (*end && (!*next || *next == sep)) {
2644 str++;
2645 found_esc = true;
2646 }
2647 }
2648
2649 if (!found_esc)
2650 for (; *end && (*end != sep); end++)
2651 /* find sep or end of string */;
2652
2653 strlen = end - str;
2654 if (strlen) {
2655 p = xdr_reserve_space(xdr, strlen + 4);
2656 if (!p)
2657 return nfserr_resource;
2658 p = xdr_encode_opaque(p, str, strlen);
2659 count++;
2660 }
2661 else
2662 end++;
2663 if (found_esc)
2664 end = next;
2665
2666 str = end;
2667 }
2668 pathlen = htonl(count);
2669 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2670 return 0;
2671 }
2672
2673 /* Encode as an array of strings the string given with components
2674 * separated @sep.
2675 */
2676 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2677 char *components)
2678 {
2679 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2680 }
2681
2682 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2683 struct nfsd4_fs_location *location)
2684 {
2685 __be32 status;
2686
2687 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2688 '[', ']');
2689 if (status)
2690 return status;
2691 status = nfsd4_encode_components(xdr, '/', location->path);
2692 if (status)
2693 return status;
2694 return nfs_ok;
2695 }
2696
2697 static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2698 const struct path *root,
2699 const struct path *path)
2700 {
2701 struct path cur = *path;
2702 __be32 *p;
2703 struct dentry **components = NULL;
2704 unsigned int ncomponents = 0;
2705 __be32 err = nfserr_jukebox;
2706
2707 dprintk("nfsd4_encode_components(");
2708
2709 path_get(&cur);
2710 /* First walk the path up to the nfsd root, and store the
2711 * dentries/path components in an array.
2712 */
2713 for (;;) {
2714 if (path_equal(&cur, root))
2715 break;
2716 if (cur.dentry == cur.mnt->mnt_root) {
2717 if (follow_up(&cur))
2718 continue;
2719 goto out_free;
2720 }
2721 if ((ncomponents & 15) == 0) {
2722 struct dentry **new;
2723 new = krealloc(components,
2724 sizeof(*new) * (ncomponents + 16),
2725 GFP_KERNEL);
2726 if (!new)
2727 goto out_free;
2728 components = new;
2729 }
2730 components[ncomponents++] = cur.dentry;
2731 cur.dentry = dget_parent(cur.dentry);
2732 }
2733 err = nfserr_resource;
2734 p = xdr_reserve_space(xdr, 4);
2735 if (!p)
2736 goto out_free;
2737 *p++ = cpu_to_be32(ncomponents);
2738
2739 while (ncomponents) {
2740 struct dentry *dentry = components[ncomponents - 1];
2741 unsigned int len;
2742
2743 spin_lock(&dentry->d_lock);
2744 len = dentry->d_name.len;
2745 p = xdr_reserve_space(xdr, len + 4);
2746 if (!p) {
2747 spin_unlock(&dentry->d_lock);
2748 goto out_free;
2749 }
2750 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2751 dprintk("/%pd", dentry);
2752 spin_unlock(&dentry->d_lock);
2753 dput(dentry);
2754 ncomponents--;
2755 }
2756
2757 err = 0;
2758 out_free:
2759 dprintk(")\n");
2760 while (ncomponents)
2761 dput(components[--ncomponents]);
2762 kfree(components);
2763 path_put(&cur);
2764 return err;
2765 }
2766
2767 static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2768 struct svc_rqst *rqstp,
2769 struct svc_export *exp)
2770 {
2771 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2772 struct svc_export *exp_ps;
2773 unsigned int i;
2774 __be32 status;
2775
2776 /* fs_root */
2777 exp_ps = rqst_find_fsidzero_export(rqstp);
2778 if (IS_ERR(exp_ps))
2779 return nfserrno(PTR_ERR(exp_ps));
2780 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path);
2781 exp_put(exp_ps);
2782 if (status != nfs_ok)
2783 return status;
2784
2785 /* locations<> */
2786 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT)
2787 return nfserr_resource;
2788 for (i = 0; i < fslocs->locations_count; i++) {
2789 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2790 if (status != nfs_ok)
2791 return status;
2792 }
2793
2794 return nfs_ok;
2795 }
2796
2797 static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2798 struct nfs4_ace *ace)
2799 {
2800 __be32 status;
2801
2802 /* type */
2803 status = nfsd4_encode_acetype4(xdr, ace->type);
2804 if (status != nfs_ok)
2805 return nfserr_resource;
2806 /* flag */
2807 status = nfsd4_encode_aceflag4(xdr, ace->flag);
2808 if (status != nfs_ok)
2809 return nfserr_resource;
2810 /* access mask */
2811 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2812 if (status != nfs_ok)
2813 return nfserr_resource;
2814 /* who */
2815 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2816 return nfs4_acl_write_who(xdr, ace->whotype);
2817 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2818 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2819 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2820 }
2821
2822 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2823 FATTR4_WORD0_RDATTR_ERROR)
2824 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2825 #define WORD2_ABSENT_FS_ATTRS 0
2826
2827 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2828 static inline __be32
2829 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2830 void *context, int len)
2831 {
2832 __be32 *p;
2833
2834 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2835 if (!p)
2836 return nfserr_resource;
2837
2838 /*
2839 * For now we use a 0 here to indicate the null translation; in
2840 * the future we may place a call to translation code here.
2841 */
2842 *p++ = cpu_to_be32(0); /* lfs */
2843 *p++ = cpu_to_be32(0); /* pi */
2844 p = xdr_encode_opaque(p, context, len);
2845 return 0;
2846 }
2847 #else
2848 static inline __be32
2849 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2850 void *context, int len)
2851 { return 0; }
2852 #endif
2853
2854 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2855 {
2856 /* As per referral draft: */
2857 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2858 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2859 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2860 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2861 *rdattr_err = NFSERR_MOVED;
2862 else
2863 return nfserr_moved;
2864 }
2865 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2866 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2867 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2868 return 0;
2869 }
2870
2871
2872 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2873 {
2874 struct path path = exp->ex_path;
2875 struct kstat stat;
2876 int err;
2877
2878 path_get(&path);
2879 while (follow_up(&path)) {
2880 if (path.dentry != path.mnt->mnt_root)
2881 break;
2882 }
2883 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2884 path_put(&path);
2885 if (!err)
2886 *pino = stat.ino;
2887 return err;
2888 }
2889
2890 static __be32
2891 nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2892 {
2893 __be32 *p;
2894
2895 if (bmval2) {
2896 p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2897 if (!p)
2898 goto out_resource;
2899 *p++ = cpu_to_be32(3);
2900 *p++ = cpu_to_be32(bmval0);
2901 *p++ = cpu_to_be32(bmval1);
2902 *p++ = cpu_to_be32(bmval2);
2903 } else if (bmval1) {
2904 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2905 if (!p)
2906 goto out_resource;
2907 *p++ = cpu_to_be32(2);
2908 *p++ = cpu_to_be32(bmval0);
2909 *p++ = cpu_to_be32(bmval1);
2910 } else {
2911 p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2912 if (!p)
2913 goto out_resource;
2914 *p++ = cpu_to_be32(1);
2915 *p++ = cpu_to_be32(bmval0);
2916 }
2917
2918 return nfs_ok;
2919 out_resource:
2920 return nfserr_resource;
2921 }
2922
2923 struct nfsd4_fattr_args {
2924 struct svc_rqst *rqstp;
2925 struct svc_fh *fhp;
2926 struct svc_export *exp;
2927 struct dentry *dentry;
2928 struct kstat stat;
2929 struct kstatfs statfs;
2930 struct nfs4_acl *acl;
2931 u64 size;
2932 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2933 void *context;
2934 int contextlen;
2935 #endif
2936 u32 rdattr_err;
2937 bool contextsupport;
2938 bool ignore_crossmnt;
2939 };
2940
2941 typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2942 const struct nfsd4_fattr_args *args);
2943
2944 static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2945 const struct nfsd4_fattr_args *args)
2946 {
2947 return nfs_ok;
2948 }
2949
2950 static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2951 const struct nfsd4_fattr_args *args)
2952 {
2953 return nfsd4_encode_bool(xdr, true);
2954 }
2955
2956 static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2957 const struct nfsd4_fattr_args *args)
2958 {
2959 return nfsd4_encode_bool(xdr, false);
2960 }
2961
2962 static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2963 const struct nfsd4_fattr_args *args)
2964 {
2965 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2966 u32 minorversion = resp->cstate.minorversion;
2967 u32 supp[3];
2968
2969 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2970 if (!IS_POSIXACL(d_inode(args->dentry)))
2971 supp[0] &= ~FATTR4_WORD0_ACL;
2972 if (!args->contextsupport)
2973 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2974
2975 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
2976 }
2977
2978 static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2979 const struct nfsd4_fattr_args *args)
2980 {
2981 __be32 *p;
2982
2983 p = xdr_reserve_space(xdr, XDR_UNIT);
2984 if (!p)
2985 return nfserr_resource;
2986
2987 switch (args->stat.mode & S_IFMT) {
2988 case S_IFIFO:
2989 *p = cpu_to_be32(NF4FIFO);
2990 break;
2991 case S_IFCHR:
2992 *p = cpu_to_be32(NF4CHR);
2993 break;
2994 case S_IFDIR:
2995 *p = cpu_to_be32(NF4DIR);
2996 break;
2997 case S_IFBLK:
2998 *p = cpu_to_be32(NF4BLK);
2999 break;
3000 case S_IFLNK:
3001 *p = cpu_to_be32(NF4LNK);
3002 break;
3003 case S_IFREG:
3004 *p = cpu_to_be32(NF4REG);
3005 break;
3006 case S_IFSOCK:
3007 *p = cpu_to_be32(NF4SOCK);
3008 break;
3009 default:
3010 return nfserr_serverfault;
3011 }
3012
3013 return nfs_ok;
3014 }
3015
3016 static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
3017 const struct nfsd4_fattr_args *args)
3018 {
3019 u32 mask;
3020
3021 mask = NFS4_FH_PERSISTENT;
3022 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3023 mask |= NFS4_FH_VOL_RENAME;
3024 return nfsd4_encode_uint32_t(xdr, mask);
3025 }
3026
3027 static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3028 const struct nfsd4_fattr_args *args)
3029 {
3030 const struct svc_export *exp = args->exp;
3031 u64 c;
3032
3033 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3034 u32 flush_time = convert_to_wallclock(exp->cd->flush_time);
3035
3036 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT)
3037 return nfserr_resource;
3038 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3039 return nfserr_resource;
3040 return nfs_ok;
3041 }
3042
3043 c = nfsd4_change_attribute(&args->stat, d_inode(args->dentry));
3044 return nfsd4_encode_changeid4(xdr, c);
3045 }
3046
3047 static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3048 const struct nfsd4_fattr_args *args)
3049 {
3050 return nfsd4_encode_uint64_t(xdr, args->size);
3051 }
3052
3053 static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3054 const struct nfsd4_fattr_args *args)
3055 {
3056 __be32 *p;
3057
3058 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3059 if (!p)
3060 return nfserr_resource;
3061
3062 if (unlikely(args->exp->ex_fslocs.migrated)) {
3063 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3064 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3065 return nfs_ok;
3066 }
3067 switch (fsid_source(args->fhp)) {
3068 case FSIDSOURCE_FSID:
3069 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid);
3070 xdr_encode_hyper(p, (u64)0);
3071 break;
3072 case FSIDSOURCE_DEV:
3073 *p++ = xdr_zero;
3074 *p++ = cpu_to_be32(MAJOR(args->stat.dev));
3075 *p++ = xdr_zero;
3076 *p = cpu_to_be32(MINOR(args->stat.dev));
3077 break;
3078 case FSIDSOURCE_UUID:
3079 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN);
3080 break;
3081 }
3082
3083 return nfs_ok;
3084 }
3085
3086 static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3087 const struct nfsd4_fattr_args *args)
3088 {
3089 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id);
3090
3091 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3092 }
3093
3094 static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3095 const struct nfsd4_fattr_args *args)
3096 {
3097 return nfsd4_encode_uint32_t(xdr, args->rdattr_err);
3098 }
3099
3100 static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3101 const struct nfsd4_fattr_args *args)
3102 {
3103 u32 mask;
3104
3105 mask = 0;
3106 if (IS_POSIXACL(d_inode(args->dentry)))
3107 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3108 return nfsd4_encode_uint32_t(xdr, mask);
3109 }
3110
3111 static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3112 const struct nfsd4_fattr_args *args)
3113 {
3114 struct nfs4_acl *acl = args->acl;
3115 struct nfs4_ace *ace;
3116 __be32 status;
3117
3118 /* nfsace4<> */
3119 if (!acl) {
3120 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3121 return nfserr_resource;
3122 } else {
3123 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT)
3124 return nfserr_resource;
3125 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3126 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace);
3127 if (status != nfs_ok)
3128 return status;
3129 }
3130 }
3131 return nfs_ok;
3132 }
3133
3134 static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3135 const struct nfsd4_fattr_args *args)
3136 {
3137 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle);
3138 }
3139
3140 static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3141 const struct nfsd4_fattr_args *args)
3142 {
3143 return nfsd4_encode_uint64_t(xdr, args->stat.ino);
3144 }
3145
3146 static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3147 const struct nfsd4_fattr_args *args)
3148 {
3149 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3150 }
3151
3152 static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3153 const struct nfsd4_fattr_args *args)
3154 {
3155 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3156 }
3157
3158 static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3159 const struct nfsd4_fattr_args *args)
3160 {
3161 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files);
3162 }
3163
3164 static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3165 const struct nfsd4_fattr_args *args)
3166 {
3167 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp);
3168 }
3169
3170 static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3171 const struct nfsd4_fattr_args *args)
3172 {
3173 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3174
3175 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes);
3176 }
3177
3178 static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3179 const struct nfsd4_fattr_args *args)
3180 {
3181 return nfsd4_encode_uint32_t(xdr, 255);
3182 }
3183
3184 static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3185 const struct nfsd4_fattr_args *args)
3186 {
3187 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen);
3188 }
3189
3190 static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3191 const struct nfsd4_fattr_args *args)
3192 {
3193 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3194 }
3195
3196 static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3197 const struct nfsd4_fattr_args *args)
3198 {
3199 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3200 }
3201
3202 static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3203 const struct nfsd4_fattr_args *args)
3204 {
3205 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3206 }
3207
3208 static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3209 const struct nfsd4_fattr_args *args)
3210 {
3211 return nfsd4_encode_uint32_t(xdr, args->stat.nlink);
3212 }
3213
3214 static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3215 const struct nfsd4_fattr_args *args)
3216 {
3217 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3218 }
3219
3220 static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3221 const struct nfsd4_fattr_args *args)
3222 {
3223 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3224 }
3225
3226 static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3227 const struct nfsd4_fattr_args *args)
3228 {
3229 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3230 MINOR(args->stat.rdev));
3231 }
3232
3233 static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3234 const struct nfsd4_fattr_args *args)
3235 {
3236 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3237
3238 return nfsd4_encode_uint64_t(xdr, avail);
3239 }
3240
3241 static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3242 const struct nfsd4_fattr_args *args)
3243 {
3244 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3245
3246 return nfsd4_encode_uint64_t(xdr, free);
3247 }
3248
3249 static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3250 const struct nfsd4_fattr_args *args)
3251 {
3252 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3253
3254 return nfsd4_encode_uint64_t(xdr, total);
3255 }
3256
3257 static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3258 const struct nfsd4_fattr_args *args)
3259 {
3260 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9);
3261 }
3262
3263 static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3264 const struct nfsd4_fattr_args *args)
3265 {
3266 return nfsd4_encode_nfstime4(xdr, &args->stat.atime);
3267 }
3268
3269 static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3270 const struct nfsd4_fattr_args *args)
3271 {
3272 return nfsd4_encode_nfstime4(xdr, &args->stat.btime);
3273 }
3274
3275 /*
3276 * ctime (in NFSv4, time_metadata) is not writeable, and the client
3277 * doesn't really care what resolution could theoretically be stored by
3278 * the filesystem.
3279 *
3280 * The client cares how close together changes can be while still
3281 * guaranteeing ctime changes. For most filesystems (which have
3282 * timestamps with nanosecond fields) that is limited by the resolution
3283 * of the time returned from current_time() (which I'm assuming to be
3284 * 1/HZ).
3285 */
3286 static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3287 const struct nfsd4_fattr_args *args)
3288 {
3289 const struct inode *inode = d_inode(args->dentry);
3290 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3291 struct timespec64 ts = ns_to_timespec64(ns);
3292
3293 return nfsd4_encode_nfstime4(xdr, &ts);
3294 }
3295
3296 static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3297 const struct nfsd4_fattr_args *args)
3298 {
3299 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime);
3300 }
3301
3302 static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3303 const struct nfsd4_fattr_args *args)
3304 {
3305 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime);
3306 }
3307
3308 static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3309 const struct nfsd4_fattr_args *args)
3310 {
3311 u64 ino;
3312 int err;
3313
3314 if (!args->ignore_crossmnt &&
3315 args->dentry == args->exp->ex_path.mnt->mnt_root) {
3316 err = nfsd4_get_mounted_on_ino(args->exp, &ino);
3317 if (err)
3318 return nfserrno(err);
3319 } else
3320 ino = args->stat.ino;
3321
3322 return nfsd4_encode_uint64_t(xdr, ino);
3323 }
3324
3325 #ifdef CONFIG_NFSD_PNFS
3326
3327 static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3328 const struct nfsd4_fattr_args *args)
3329 {
3330 unsigned long mask = args->exp->ex_layout_types;
3331 int i;
3332
3333 /* Hamming weight of @mask is the number of layout types to return */
3334 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3335 return nfserr_resource;
3336 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3337 if (mask & BIT(i)) {
3338 /* layouttype4 */
3339 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3340 return nfserr_resource;
3341 }
3342 return nfs_ok;
3343 }
3344
3345 static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3346 const struct nfsd4_fattr_args *args)
3347 {
3348 unsigned long mask = args->exp->ex_layout_types;
3349 int i;
3350
3351 /* Hamming weight of @mask is the number of layout types to return */
3352 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3353 return nfserr_resource;
3354 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3355 if (mask & BIT(i)) {
3356 /* layouttype4 */
3357 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3358 return nfserr_resource;
3359 }
3360 return nfs_ok;
3361 }
3362
3363 static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3364 const struct nfsd4_fattr_args *args)
3365 {
3366 return nfsd4_encode_uint32_t(xdr, args->stat.blksize);
3367 }
3368
3369 #endif
3370
3371 static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3372 const struct nfsd4_fattr_args *args)
3373 {
3374 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3375 u32 supp[3];
3376
3377 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3378 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3379 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3380 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3381
3382 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
3383 }
3384
3385 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3386 static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3387 const struct nfsd4_fattr_args *args)
3388 {
3389 return nfsd4_encode_security_label(xdr, args->rqstp,
3390 args->context, args->contextlen);
3391 }
3392 #endif
3393
3394 static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3395 const struct nfsd4_fattr_args *args)
3396 {
3397 int err = xattr_supports_user_prefix(d_inode(args->dentry));
3398
3399 return nfsd4_encode_bool(xdr, err == 0);
3400 }
3401
3402 static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3403 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3404 [FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3405 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3406 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3407 [FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3408 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3409 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3410 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3411 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3412 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3413 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3414 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3415 [FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3416 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3417 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3418 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3419 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3420 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3421 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3422 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3423 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3424 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3425 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3426 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3427 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3428 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3429 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3430 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3431 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3432 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3433 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3434 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3435 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3436 [FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3437 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3438 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3439 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3440 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3441 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3442 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3443 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3444 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3445 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3446 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3447 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3448 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3449 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3450 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3451 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3452 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3453 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3454 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3455 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3456 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3457 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3458 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3459 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3460 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3461 [FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3462 [FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3463 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3464 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3465
3466 #ifdef CONFIG_NFSD_PNFS
3467 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3468 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3469 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3470 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3471 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3472 #else
3473 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3474 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3475 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3476 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3477 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3478 #endif
3479
3480 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3481 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3482 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3483 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3484 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3485 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3486 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3487 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3488 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3489 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3490 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3491 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3492 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3493
3494 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3495 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3496 #else
3497 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3498 #endif
3499
3500 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3501 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3502 };
3503
3504 /*
3505 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3506 * ourselves.
3507 */
3508 static __be32
3509 nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3510 struct svc_fh *fhp, struct svc_export *exp,
3511 struct dentry *dentry, const u32 *bmval,
3512 int ignore_crossmnt)
3513 {
3514 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3515 struct nfsd4_fattr_args args;
3516 struct svc_fh *tempfh = NULL;
3517 int starting_len = xdr->buf->len;
3518 __be32 *attrlen_p, status;
3519 int attrlen_offset;
3520 u32 attrmask[3];
3521 int err;
3522 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3523 u32 minorversion = resp->cstate.minorversion;
3524 struct path path = {
3525 .mnt = exp->ex_path.mnt,
3526 .dentry = dentry,
3527 };
3528 unsigned long bit;
3529 bool file_modified = false;
3530 u64 size = 0;
3531
3532 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3533 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3534
3535 args.rqstp = rqstp;
3536 args.exp = exp;
3537 args.dentry = dentry;
3538 args.ignore_crossmnt = (ignore_crossmnt != 0);
3539 args.acl = NULL;
3540 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3541 args.context = NULL;
3542 #endif
3543
3544 /*
3545 * Make a local copy of the attribute bitmap that can be modified.
3546 */
3547 attrmask[0] = bmval[0];
3548 attrmask[1] = bmval[1];
3549 attrmask[2] = bmval[2];
3550
3551 args.rdattr_err = 0;
3552 if (exp->ex_fslocs.migrated) {
3553 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1],
3554 &attrmask[2], &args.rdattr_err);
3555 if (status)
3556 goto out;
3557 }
3558 args.size = 0;
3559 if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
3560 status = nfsd4_deleg_getattr_conflict(rqstp, dentry,
3561 &file_modified, &size);
3562 if (status)
3563 goto out;
3564 }
3565
3566 err = vfs_getattr(&path, &args.stat,
3567 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3568 AT_STATX_SYNC_AS_STAT);
3569 if (err)
3570 goto out_nfserr;
3571 if (file_modified)
3572 args.size = size;
3573 else
3574 args.size = args.stat.size;
3575
3576 if (!(args.stat.result_mask & STATX_BTIME))
3577 /* underlying FS does not offer btime so we can't share it */
3578 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3579 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3580 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3581 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3582 FATTR4_WORD1_SPACE_TOTAL))) {
3583 err = vfs_statfs(&path, &args.statfs);
3584 if (err)
3585 goto out_nfserr;
3586 }
3587 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3588 !fhp) {
3589 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
3590 status = nfserr_jukebox;
3591 if (!tempfh)
3592 goto out;
3593 fh_init(tempfh, NFS4_FHSIZE);
3594 status = fh_compose(tempfh, exp, dentry, NULL);
3595 if (status)
3596 goto out;
3597 args.fhp = tempfh;
3598 } else
3599 args.fhp = fhp;
3600
3601 if (attrmask[0] & FATTR4_WORD0_ACL) {
3602 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
3603 if (err == -EOPNOTSUPP)
3604 attrmask[0] &= ~FATTR4_WORD0_ACL;
3605 else if (err == -EINVAL) {
3606 status = nfserr_attrnotsupp;
3607 goto out;
3608 } else if (err != 0)
3609 goto out_nfserr;
3610 }
3611
3612 args.contextsupport = false;
3613
3614 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3615 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3616 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3617 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3618 err = security_inode_getsecctx(d_inode(dentry),
3619 &args.context, &args.contextlen);
3620 else
3621 err = -EOPNOTSUPP;
3622 args.contextsupport = (err == 0);
3623 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3624 if (err == -EOPNOTSUPP)
3625 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3626 else if (err)
3627 goto out_nfserr;
3628 }
3629 }
3630 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3631
3632 /* attrmask */
3633 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1],
3634 attrmask[2]);
3635 if (status)
3636 goto out;
3637
3638 /* attr_vals */
3639 attrlen_offset = xdr->buf->len;
3640 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3641 if (!attrlen_p)
3642 goto out_resource;
3643 bitmap_from_arr32(attr_bitmap, attrmask,
3644 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3645 for_each_set_bit(bit, attr_bitmap,
3646 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3647 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3648 if (status != nfs_ok)
3649 goto out;
3650 }
3651 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3652 status = nfs_ok;
3653
3654 out:
3655 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3656 if (args.context)
3657 security_release_secctx(args.context, args.contextlen);
3658 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3659 kfree(args.acl);
3660 if (tempfh) {
3661 fh_put(tempfh);
3662 kfree(tempfh);
3663 }
3664 if (status)
3665 xdr_truncate_encode(xdr, starting_len);
3666 return status;
3667 out_nfserr:
3668 status = nfserrno(err);
3669 goto out;
3670 out_resource:
3671 status = nfserr_resource;
3672 goto out;
3673 }
3674
3675 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3676 struct xdr_buf *buf, __be32 *p, int bytes)
3677 {
3678 xdr->scratch.iov_len = 0;
3679 memset(buf, 0, sizeof(struct xdr_buf));
3680 buf->head[0].iov_base = p;
3681 buf->head[0].iov_len = 0;
3682 buf->len = 0;
3683 xdr->buf = buf;
3684 xdr->iov = buf->head;
3685 xdr->p = p;
3686 xdr->end = (void *)p + bytes;
3687 buf->buflen = bytes;
3688 }
3689
3690 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3691 struct svc_fh *fhp, struct svc_export *exp,
3692 struct dentry *dentry, u32 *bmval,
3693 struct svc_rqst *rqstp, int ignore_crossmnt)
3694 {
3695 struct xdr_buf dummy;
3696 struct xdr_stream xdr;
3697 __be32 ret;
3698
3699 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3700 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval,
3701 ignore_crossmnt);
3702 *p = xdr.p;
3703 return ret;
3704 }
3705
3706 /*
3707 * The buffer space for this field was reserved during a previous
3708 * call to nfsd4_encode_entry4().
3709 */
3710 static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3711 u64 offset)
3712 {
3713 __be64 cookie = cpu_to_be64(offset);
3714 struct xdr_stream *xdr = readdir->xdr;
3715
3716 if (!readdir->cookie_offset)
3717 return;
3718 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3719 sizeof(cookie));
3720 }
3721
3722 static inline int attributes_need_mount(u32 *bmval)
3723 {
3724 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3725 return 1;
3726 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3727 return 1;
3728 return 0;
3729 }
3730
3731 static __be32
3732 nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3733 int namlen)
3734 {
3735 struct svc_export *exp = cd->rd_fhp->fh_export;
3736 struct dentry *dentry;
3737 __be32 nfserr;
3738 int ignore_crossmnt = 0;
3739
3740 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3741 if (IS_ERR(dentry))
3742 return nfserrno(PTR_ERR(dentry));
3743
3744 exp_get(exp);
3745 /*
3746 * In the case of a mountpoint, the client may be asking for
3747 * attributes that are only properties of the underlying filesystem
3748 * as opposed to the cross-mounted file system. In such a case,
3749 * we will not follow the cross mount and will fill the attribtutes
3750 * directly from the mountpoint dentry.
3751 */
3752 if (nfsd_mountpoint(dentry, exp)) {
3753 int err;
3754
3755 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3756 && !attributes_need_mount(cd->rd_bmval)) {
3757 ignore_crossmnt = 1;
3758 goto out_encode;
3759 }
3760 /*
3761 * Why the heck aren't we just using nfsd_lookup??
3762 * Different "."/".." handling? Something else?
3763 * At least, add a comment here to explain....
3764 */
3765 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3766 if (err) {
3767 nfserr = nfserrno(err);
3768 goto out_put;
3769 }
3770 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3771 if (nfserr)
3772 goto out_put;
3773
3774 }
3775 out_encode:
3776 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry,
3777 cd->rd_bmval, ignore_crossmnt);
3778 out_put:
3779 dput(dentry);
3780 exp_put(exp);
3781 return nfserr;
3782 }
3783
3784 static __be32
3785 nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3786 {
3787 __be32 status;
3788
3789 /* attrmask */
3790 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0);
3791 if (status != nfs_ok)
3792 return status;
3793 /* attr_vals */
3794 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3795 return nfserr_resource;
3796 /* rdattr_error */
3797 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT)
3798 return nfserr_resource;
3799 return nfs_ok;
3800 }
3801
3802 static int
3803 nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3804 loff_t offset, u64 ino, unsigned int d_type)
3805 {
3806 struct readdir_cd *ccd = ccdv;
3807 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3808 struct xdr_stream *xdr = cd->xdr;
3809 int start_offset = xdr->buf->len;
3810 int cookie_offset;
3811 u32 name_and_cookie;
3812 int entry_bytes;
3813 __be32 nfserr = nfserr_toosmall;
3814
3815 /* In nfsv4, "." and ".." never make it onto the wire.. */
3816 if (name && isdotent(name, namlen)) {
3817 cd->common.err = nfs_ok;
3818 return 0;
3819 }
3820
3821 /* Encode the previous entry's cookie value */
3822 nfsd4_encode_entry4_nfs_cookie4(cd, offset);
3823
3824 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3825 goto fail;
3826
3827 /* Reserve send buffer space for this entry's cookie value. */
3828 cookie_offset = xdr->buf->len;
3829 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3830 goto fail;
3831 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3832 goto fail;
3833 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3834 switch (nfserr) {
3835 case nfs_ok:
3836 break;
3837 case nfserr_resource:
3838 nfserr = nfserr_toosmall;
3839 goto fail;
3840 case nfserr_noent:
3841 xdr_truncate_encode(xdr, start_offset);
3842 goto skip_entry;
3843 case nfserr_jukebox:
3844 /*
3845 * The pseudoroot should only display dentries that lead to
3846 * exports. If we get EJUKEBOX here, then we can't tell whether
3847 * this entry should be included. Just fail the whole READDIR
3848 * with NFS4ERR_DELAY in that case, and hope that the situation
3849 * will resolve itself by the client's next attempt.
3850 */
3851 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3852 goto fail;
3853 fallthrough;
3854 default:
3855 /*
3856 * If the client requested the RDATTR_ERROR attribute,
3857 * we stuff the error code into this attribute
3858 * and continue. If this attribute was not requested,
3859 * then in accordance with the spec, we fail the
3860 * entire READDIR operation(!)
3861 */
3862 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3863 goto fail;
3864 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3865 nfserr = nfserr_toosmall;
3866 goto fail;
3867 }
3868 }
3869 nfserr = nfserr_toosmall;
3870 entry_bytes = xdr->buf->len - start_offset;
3871 if (entry_bytes > cd->rd_maxcount)
3872 goto fail;
3873 cd->rd_maxcount -= entry_bytes;
3874 /*
3875 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3876 * notes that it could be zero. If it is zero, then the server
3877 * should enforce only the rd_maxcount value.
3878 */
3879 if (cd->rd_dircount) {
3880 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3881 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3882 goto fail;
3883 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3884 if (!cd->rd_dircount)
3885 cd->rd_maxcount = 0;
3886 }
3887
3888 cd->cookie_offset = cookie_offset;
3889 skip_entry:
3890 cd->common.err = nfs_ok;
3891 return 0;
3892 fail:
3893 xdr_truncate_encode(xdr, start_offset);
3894 cd->common.err = nfserr;
3895 return -EINVAL;
3896 }
3897
3898 static __be32
3899 nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3900 {
3901 __be32 *p;
3902
3903 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3904 if (!p)
3905 return nfserr_resource;
3906 memcpy(p, verf->data, sizeof(verf->data));
3907 return nfs_ok;
3908 }
3909
3910 static __be32
3911 nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3912 {
3913 __be32 *p;
3914
3915 p = xdr_reserve_space(xdr, sizeof(__be64));
3916 if (!p)
3917 return nfserr_resource;
3918 memcpy(p, clientid, sizeof(*clientid));
3919 return nfs_ok;
3920 }
3921
3922 /* This is a frequently-encoded item; open-coded for speed */
3923 static __be32
3924 nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
3925 {
3926 __be32 *p;
3927
3928 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
3929 if (!p)
3930 return nfserr_resource;
3931 *p++ = cpu_to_be32(sid->si_generation);
3932 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
3933 return nfs_ok;
3934 }
3935
3936 static __be32
3937 nfsd4_encode_sessionid4(struct xdr_stream *xdr,
3938 const struct nfs4_sessionid *sessionid)
3939 {
3940 return nfsd4_encode_opaque_fixed(xdr, sessionid->data,
3941 NFS4_MAX_SESSIONID_LEN);
3942 }
3943
3944 static __be32
3945 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3946 union nfsd4_op_u *u)
3947 {
3948 struct nfsd4_access *access = &u->access;
3949 struct xdr_stream *xdr = resp->xdr;
3950 __be32 status;
3951
3952 /* supported */
3953 status = nfsd4_encode_uint32_t(xdr, access->ac_supported);
3954 if (status != nfs_ok)
3955 return status;
3956 /* access */
3957 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access);
3958 }
3959
3960 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3961 union nfsd4_op_u *u)
3962 {
3963 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3964 struct xdr_stream *xdr = resp->xdr;
3965
3966 /* bctsr_sessid */
3967 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid);
3968 if (nfserr != nfs_ok)
3969 return nfserr;
3970 /* bctsr_dir */
3971 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT)
3972 return nfserr_resource;
3973 /* bctsr_use_conn_in_rdma_mode */
3974 return nfsd4_encode_bool(xdr, false);
3975 }
3976
3977 static __be32
3978 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3979 union nfsd4_op_u *u)
3980 {
3981 struct nfsd4_close *close = &u->close;
3982 struct xdr_stream *xdr = resp->xdr;
3983
3984 /* open_stateid */
3985 return nfsd4_encode_stateid4(xdr, &close->cl_stateid);
3986 }
3987
3988
3989 static __be32
3990 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3991 union nfsd4_op_u *u)
3992 {
3993 struct nfsd4_commit *commit = &u->commit;
3994
3995 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf);
3996 }
3997
3998 static __be32
3999 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
4000 union nfsd4_op_u *u)
4001 {
4002 struct nfsd4_create *create = &u->create;
4003 struct xdr_stream *xdr = resp->xdr;
4004
4005 /* cinfo */
4006 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo);
4007 if (nfserr)
4008 return nfserr;
4009 /* attrset */
4010 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0],
4011 create->cr_bmval[1], create->cr_bmval[2]);
4012 }
4013
4014 static __be32
4015 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4016 union nfsd4_op_u *u)
4017 {
4018 struct nfsd4_getattr *getattr = &u->getattr;
4019 struct svc_fh *fhp = getattr->ga_fhp;
4020 struct xdr_stream *xdr = resp->xdr;
4021
4022 /* obj_attributes */
4023 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export,
4024 fhp->fh_dentry, getattr->ga_bmval, 0);
4025 }
4026
4027 static __be32
4028 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4029 union nfsd4_op_u *u)
4030 {
4031 struct xdr_stream *xdr = resp->xdr;
4032 struct svc_fh *fhp = u->getfh;
4033
4034 /* object */
4035 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle);
4036 }
4037
4038 static __be32
4039 nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4040 const struct xdr_netobj *owner)
4041 {
4042 __be32 status;
4043
4044 /* clientid */
4045 status = nfsd4_encode_clientid4(xdr, clientid);
4046 if (status != nfs_ok)
4047 return status;
4048 /* owner */
4049 return nfsd4_encode_opaque(xdr, owner->data, owner->len);
4050 }
4051
4052 static __be32
4053 nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4054 const struct nfsd4_lock_denied *ld)
4055 {
4056 __be32 status;
4057
4058 /* offset */
4059 status = nfsd4_encode_offset4(xdr, ld->ld_start);
4060 if (status != nfs_ok)
4061 return status;
4062 /* length */
4063 status = nfsd4_encode_length4(xdr, ld->ld_length);
4064 if (status != nfs_ok)
4065 return status;
4066 /* locktype */
4067 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT)
4068 return nfserr_resource;
4069 /* owner */
4070 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
4071 &ld->ld_owner);
4072 }
4073
4074 static __be32
4075 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4076 union nfsd4_op_u *u)
4077 {
4078 struct nfsd4_lock *lock = &u->lock;
4079 struct xdr_stream *xdr = resp->xdr;
4080 __be32 status;
4081
4082 switch (nfserr) {
4083 case nfs_ok:
4084 /* resok4 */
4085 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
4086 break;
4087 case nfserr_denied:
4088 /* denied */
4089 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied);
4090 break;
4091 default:
4092 return nfserr;
4093 }
4094 return status != nfs_ok ? status : nfserr;
4095 }
4096
4097 static __be32
4098 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4099 union nfsd4_op_u *u)
4100 {
4101 struct nfsd4_lockt *lockt = &u->lockt;
4102 struct xdr_stream *xdr = resp->xdr;
4103 __be32 status;
4104
4105 if (nfserr == nfserr_denied) {
4106 /* denied */
4107 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied);
4108 if (status != nfs_ok)
4109 return status;
4110 }
4111 return nfserr;
4112 }
4113
4114 static __be32
4115 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4116 union nfsd4_op_u *u)
4117 {
4118 struct nfsd4_locku *locku = &u->locku;
4119 struct xdr_stream *xdr = resp->xdr;
4120
4121 /* lock_stateid */
4122 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid);
4123 }
4124
4125
4126 static __be32
4127 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4128 union nfsd4_op_u *u)
4129 {
4130 struct nfsd4_link *link = &u->link;
4131 struct xdr_stream *xdr = resp->xdr;
4132
4133 return nfsd4_encode_change_info4(xdr, &link->li_cinfo);
4134 }
4135
4136 /*
4137 * This implementation does not yet support returning an ACE in an
4138 * OPEN that offers a delegation.
4139 */
4140 static __be32
4141 nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4142 {
4143 __be32 status;
4144
4145 /* type */
4146 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4147 if (status != nfs_ok)
4148 return nfserr_resource;
4149 /* flag */
4150 status = nfsd4_encode_aceflag4(xdr, 0);
4151 if (status != nfs_ok)
4152 return nfserr_resource;
4153 /* access mask */
4154 status = nfsd4_encode_acemask4(xdr, 0);
4155 if (status != nfs_ok)
4156 return nfserr_resource;
4157 /* who - empty for now */
4158 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4159 return nfserr_resource;
4160 return nfs_ok;
4161 }
4162
4163 static __be32
4164 nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4165 {
4166 __be32 status;
4167
4168 /* stateid */
4169 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4170 if (status != nfs_ok)
4171 return status;
4172 /* recall */
4173 status = nfsd4_encode_bool(xdr, open->op_recall);
4174 if (status != nfs_ok)
4175 return status;
4176 /* permissions */
4177 return nfsd4_encode_open_nfsace4(xdr);
4178 }
4179
4180 static __be32
4181 nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4182 {
4183 /* limitby */
4184 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT)
4185 return nfserr_resource;
4186 /* filesize */
4187 return nfsd4_encode_uint64_t(xdr, filesize);
4188 }
4189
4190 static __be32
4191 nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4192 struct nfsd4_open *open)
4193 {
4194 __be32 status;
4195
4196 /* stateid */
4197 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4198 if (status != nfs_ok)
4199 return status;
4200 /* recall */
4201 status = nfsd4_encode_bool(xdr, open->op_recall);
4202 if (status != nfs_ok)
4203 return status;
4204 /* space_limit */
4205 status = nfsd4_encode_nfs_space_limit4(xdr, 0);
4206 if (status != nfs_ok)
4207 return status;
4208 return nfsd4_encode_open_nfsace4(xdr);
4209 }
4210
4211 static __be32
4212 nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4213 struct nfsd4_open *open)
4214 {
4215 __be32 status = nfs_ok;
4216
4217 /* ond_why */
4218 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT)
4219 return nfserr_resource;
4220 switch (open->op_why_no_deleg) {
4221 case WND4_CONTENTION:
4222 /* ond_server_will_push_deleg */
4223 status = nfsd4_encode_bool(xdr, false);
4224 break;
4225 case WND4_RESOURCE:
4226 /* ond_server_will_signal_avail */
4227 status = nfsd4_encode_bool(xdr, false);
4228 }
4229 return status;
4230 }
4231
4232 static __be32
4233 nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4234 {
4235 __be32 status;
4236
4237 /* delegation_type */
4238 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT)
4239 return nfserr_resource;
4240 switch (open->op_delegate_type) {
4241 case NFS4_OPEN_DELEGATE_NONE:
4242 status = nfs_ok;
4243 break;
4244 case NFS4_OPEN_DELEGATE_READ:
4245 /* read */
4246 status = nfsd4_encode_open_read_delegation4(xdr, open);
4247 break;
4248 case NFS4_OPEN_DELEGATE_WRITE:
4249 /* write */
4250 status = nfsd4_encode_open_write_delegation4(xdr, open);
4251 break;
4252 case NFS4_OPEN_DELEGATE_NONE_EXT:
4253 /* od_whynone */
4254 status = nfsd4_encode_open_none_delegation4(xdr, open);
4255 break;
4256 default:
4257 status = nfserr_serverfault;
4258 }
4259
4260 return status;
4261 }
4262
4263 static __be32
4264 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4265 union nfsd4_op_u *u)
4266 {
4267 struct nfsd4_open *open = &u->open;
4268 struct xdr_stream *xdr = resp->xdr;
4269
4270 /* stateid */
4271 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid);
4272 if (nfserr != nfs_ok)
4273 return nfserr;
4274 /* cinfo */
4275 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo);
4276 if (nfserr != nfs_ok)
4277 return nfserr;
4278 /* rflags */
4279 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags);
4280 if (nfserr != nfs_ok)
4281 return nfserr;
4282 /* attrset */
4283 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0],
4284 open->op_bmval[1], open->op_bmval[2]);
4285 if (nfserr != nfs_ok)
4286 return nfserr;
4287 /* delegation */
4288 return nfsd4_encode_open_delegation4(xdr, open);
4289 }
4290
4291 static __be32
4292 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4293 union nfsd4_op_u *u)
4294 {
4295 struct nfsd4_open_confirm *oc = &u->open_confirm;
4296 struct xdr_stream *xdr = resp->xdr;
4297
4298 /* open_stateid */
4299 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid);
4300 }
4301
4302 static __be32
4303 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4304 union nfsd4_op_u *u)
4305 {
4306 struct nfsd4_open_downgrade *od = &u->open_downgrade;
4307 struct xdr_stream *xdr = resp->xdr;
4308
4309 /* open_stateid */
4310 return nfsd4_encode_stateid4(xdr, &od->od_stateid);
4311 }
4312
4313 /*
4314 * The operation of this function assumes that this is the only
4315 * READ operation in the COMPOUND. If there are multiple READs,
4316 * we use nfsd4_encode_readv().
4317 */
4318 static __be32 nfsd4_encode_splice_read(
4319 struct nfsd4_compoundres *resp,
4320 struct nfsd4_read *read,
4321 struct file *file, unsigned long maxcount)
4322 {
4323 struct xdr_stream *xdr = resp->xdr;
4324 struct xdr_buf *buf = xdr->buf;
4325 int status, space_left;
4326 __be32 nfserr;
4327
4328 /*
4329 * Make sure there is room at the end of buf->head for
4330 * svcxdr_encode_opaque_pages() to create a tail buffer
4331 * to XDR-pad the payload.
4332 */
4333 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4334 return nfserr_resource;
4335
4336 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4337 file, read->rd_offset, &maxcount,
4338 &read->rd_eof);
4339 read->rd_length = maxcount;
4340 if (nfserr)
4341 goto out_err;
4342 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages,
4343 buf->page_base, maxcount);
4344 status = svc_encode_result_payload(read->rd_rqstp,
4345 buf->head[0].iov_len, maxcount);
4346 if (status) {
4347 nfserr = nfserrno(status);
4348 goto out_err;
4349 }
4350
4351 /*
4352 * Prepare to encode subsequent operations.
4353 *
4354 * xdr_truncate_encode() is not safe to use after a successful
4355 * splice read has been done, so the following stream
4356 * manipulations are open-coded.
4357 */
4358 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4359 buf->buflen - buf->len);
4360 buf->buflen = buf->len + space_left;
4361 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4362
4363 return nfs_ok;
4364
4365 out_err:
4366 /*
4367 * nfsd_splice_actor may have already messed with the
4368 * page length; reset it so as not to confuse
4369 * xdr_truncate_encode in our caller.
4370 */
4371 buf->page_len = 0;
4372 return nfserr;
4373 }
4374
4375 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4376 struct nfsd4_read *read,
4377 struct file *file, unsigned long maxcount)
4378 {
4379 struct xdr_stream *xdr = resp->xdr;
4380 unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4381 unsigned int starting_len = xdr->buf->len;
4382 __be32 zero = xdr_zero;
4383 __be32 nfserr;
4384
4385 if (xdr_reserve_space_vec(xdr, maxcount) < 0)
4386 return nfserr_resource;
4387
4388 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file,
4389 read->rd_offset, &maxcount, base,
4390 &read->rd_eof);
4391 read->rd_length = maxcount;
4392 if (nfserr)
4393 return nfserr;
4394 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4395 return nfserr_io;
4396 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4397
4398 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4399 xdr_pad_size(maxcount));
4400 return nfs_ok;
4401 }
4402
4403 static __be32
4404 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4405 union nfsd4_op_u *u)
4406 {
4407 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
4408 struct nfsd4_read *read = &u->read;
4409 struct xdr_stream *xdr = resp->xdr;
4410 int starting_len = xdr->buf->len;
4411 bool splice_ok = argp->splice_ok;
4412 unsigned long maxcount;
4413 struct file *file;
4414 __be32 *p;
4415
4416 if (nfserr)
4417 return nfserr;
4418 file = read->rd_nf->nf_file;
4419
4420 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4421 if (!p) {
4422 WARN_ON_ONCE(splice_ok);
4423 return nfserr_resource;
4424 }
4425 if (resp->xdr->buf->page_len && splice_ok) {
4426 WARN_ON_ONCE(1);
4427 return nfserr_serverfault;
4428 }
4429 xdr_commit_encode(xdr);
4430
4431 maxcount = min_t(unsigned long, read->rd_length,
4432 (xdr->buf->buflen - xdr->buf->len));
4433
4434 if (file->f_op->splice_read && splice_ok)
4435 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4436 else
4437 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4438 if (nfserr) {
4439 xdr_truncate_encode(xdr, starting_len);
4440 return nfserr;
4441 }
4442
4443 p = xdr_encode_bool(p, read->rd_eof);
4444 *p = cpu_to_be32(read->rd_length);
4445 return nfs_ok;
4446 }
4447
4448 static __be32
4449 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4450 union nfsd4_op_u *u)
4451 {
4452 struct nfsd4_readlink *readlink = &u->readlink;
4453 __be32 *p, *maxcount_p, zero = xdr_zero;
4454 struct xdr_stream *xdr = resp->xdr;
4455 int length_offset = xdr->buf->len;
4456 int maxcount, status;
4457
4458 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4459 if (!maxcount_p)
4460 return nfserr_resource;
4461 maxcount = PAGE_SIZE;
4462
4463 p = xdr_reserve_space(xdr, maxcount);
4464 if (!p)
4465 return nfserr_resource;
4466 /*
4467 * XXX: By default, vfs_readlink() will truncate symlinks if they
4468 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4469 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4470 * that truncation occurred, and return NFS4ERR_RESOURCE.
4471 */
4472 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4473 (char *)p, &maxcount);
4474 if (nfserr == nfserr_isdir)
4475 nfserr = nfserr_inval;
4476 if (nfserr)
4477 goto out_err;
4478 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4479 maxcount);
4480 if (status) {
4481 nfserr = nfserrno(status);
4482 goto out_err;
4483 }
4484 *maxcount_p = cpu_to_be32(maxcount);
4485 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4486 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4487 xdr_pad_size(maxcount));
4488 return nfs_ok;
4489
4490 out_err:
4491 xdr_truncate_encode(xdr, length_offset);
4492 return nfserr;
4493 }
4494
4495 static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4496 struct nfsd4_readdir *readdir,
4497 u32 max_payload)
4498 {
4499 int bytes_left, maxcount, starting_len = xdr->buf->len;
4500 loff_t offset;
4501 __be32 status;
4502
4503 /*
4504 * Number of bytes left for directory entries allowing for the
4505 * final 8 bytes of the readdir and a following failed op.
4506 */
4507 bytes_left = xdr->buf->buflen - xdr->buf->len -
4508 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4509 if (bytes_left < 0)
4510 return nfserr_resource;
4511 maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4512
4513 /*
4514 * The RFC defines rd_maxcount as the size of the
4515 * READDIR4resok structure, which includes the verifier
4516 * and the 8 bytes encoded at the end of this function.
4517 */
4518 if (maxcount < XDR_UNIT * 4)
4519 return nfserr_toosmall;
4520 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4521
4522 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4523 if (!readdir->rd_dircount)
4524 readdir->rd_dircount = max_payload;
4525
4526 /* *entries */
4527 readdir->xdr = xdr;
4528 readdir->rd_maxcount = maxcount;
4529 readdir->common.err = 0;
4530 readdir->cookie_offset = 0;
4531 offset = readdir->rd_cookie;
4532 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4533 &readdir->common, nfsd4_encode_entry4);
4534 if (status)
4535 return status;
4536 if (readdir->common.err == nfserr_toosmall &&
4537 xdr->buf->len == starting_len) {
4538 /* No entries were encoded. Which limit did we hit? */
4539 if (maxcount - XDR_UNIT * 4 < bytes_left)
4540 /* It was the fault of rd_maxcount */
4541 return nfserr_toosmall;
4542 /* We ran out of buffer space */
4543 return nfserr_resource;
4544 }
4545 /* Encode the final entry's cookie value */
4546 nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4547 /* No entries follow */
4548 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4549 return nfserr_resource;
4550
4551 /* eof */
4552 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof);
4553 }
4554
4555 static __be32
4556 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4557 union nfsd4_op_u *u)
4558 {
4559 struct nfsd4_readdir *readdir = &u->readdir;
4560 struct xdr_stream *xdr = resp->xdr;
4561 int starting_len = xdr->buf->len;
4562
4563 /* cookieverf */
4564 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf);
4565 if (nfserr != nfs_ok)
4566 return nfserr;
4567
4568 /* reply */
4569 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp));
4570 if (nfserr != nfs_ok)
4571 xdr_truncate_encode(xdr, starting_len);
4572 return nfserr;
4573 }
4574
4575 static __be32
4576 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4577 union nfsd4_op_u *u)
4578 {
4579 struct nfsd4_remove *remove = &u->remove;
4580 struct xdr_stream *xdr = resp->xdr;
4581
4582 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo);
4583 }
4584
4585 static __be32
4586 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4587 union nfsd4_op_u *u)
4588 {
4589 struct nfsd4_rename *rename = &u->rename;
4590 struct xdr_stream *xdr = resp->xdr;
4591
4592 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo);
4593 if (nfserr)
4594 return nfserr;
4595 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo);
4596 }
4597
4598 static __be32
4599 nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4600 struct rpcsec_gss_info *info)
4601 {
4602 __be32 status;
4603
4604 /* oid */
4605 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0)
4606 return nfserr_resource;
4607 /* qop */
4608 status = nfsd4_encode_qop4(xdr, info->qop);
4609 if (status != nfs_ok)
4610 return status;
4611 /* service */
4612 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT)
4613 return nfserr_resource;
4614
4615 return nfs_ok;
4616 }
4617
4618 static __be32
4619 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4620 {
4621 u32 i, nflavs, supported;
4622 struct exp_flavor_info *flavs;
4623 struct exp_flavor_info def_flavs[2];
4624 static bool report = true;
4625 __be32 *flavorsp;
4626 __be32 status;
4627
4628 if (exp->ex_nflavors) {
4629 flavs = exp->ex_flavors;
4630 nflavs = exp->ex_nflavors;
4631 } else { /* Handling of some defaults in absence of real secinfo: */
4632 flavs = def_flavs;
4633 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4634 nflavs = 2;
4635 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4636 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4637 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4638 nflavs = 1;
4639 flavs[0].pseudoflavor
4640 = svcauth_gss_flavor(exp->ex_client);
4641 } else {
4642 nflavs = 1;
4643 flavs[0].pseudoflavor
4644 = exp->ex_client->flavour->flavour;
4645 }
4646 }
4647
4648 supported = 0;
4649 flavorsp = xdr_reserve_space(xdr, XDR_UNIT);
4650 if (!flavorsp)
4651 return nfserr_resource;
4652
4653 for (i = 0; i < nflavs; i++) {
4654 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4655 struct rpcsec_gss_info info;
4656
4657 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4658 supported++;
4659
4660 /* flavor */
4661 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS);
4662 if (status != nfs_ok)
4663 return status;
4664 /* flavor_info */
4665 status = nfsd4_encode_rpcsec_gss_info(xdr, &info);
4666 if (status != nfs_ok)
4667 return status;
4668 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4669 supported++;
4670
4671 /* flavor */
4672 status = nfsd4_encode_uint32_t(xdr, pf);
4673 if (status != nfs_ok)
4674 return status;
4675 } else {
4676 if (report)
4677 pr_warn("NFS: SECINFO: security flavor %u "
4678 "is not supported\n", pf);
4679 }
4680 }
4681
4682 if (nflavs != supported)
4683 report = false;
4684 *flavorsp = cpu_to_be32(supported);
4685 return 0;
4686 }
4687
4688 static __be32
4689 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4690 union nfsd4_op_u *u)
4691 {
4692 struct nfsd4_secinfo *secinfo = &u->secinfo;
4693 struct xdr_stream *xdr = resp->xdr;
4694
4695 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4696 }
4697
4698 static __be32
4699 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4700 union nfsd4_op_u *u)
4701 {
4702 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4703 struct xdr_stream *xdr = resp->xdr;
4704
4705 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4706 }
4707
4708 static __be32
4709 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4710 union nfsd4_op_u *u)
4711 {
4712 struct nfsd4_setattr *setattr = &u->setattr;
4713 __be32 status;
4714
4715 switch (nfserr) {
4716 case nfs_ok:
4717 /* attrsset */
4718 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0],
4719 setattr->sa_bmval[1],
4720 setattr->sa_bmval[2]);
4721 break;
4722 default:
4723 /* attrsset */
4724 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0);
4725 }
4726 return status != nfs_ok ? status : nfserr;
4727 }
4728
4729 static __be32
4730 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4731 union nfsd4_op_u *u)
4732 {
4733 struct nfsd4_setclientid *scd = &u->setclientid;
4734 struct xdr_stream *xdr = resp->xdr;
4735
4736 if (!nfserr) {
4737 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid);
4738 if (nfserr != nfs_ok)
4739 goto out;
4740 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm);
4741 } else if (nfserr == nfserr_clid_inuse) {
4742 /* empty network id */
4743 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4744 nfserr = nfserr_resource;
4745 goto out;
4746 }
4747 /* empty universal address */
4748 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4749 nfserr = nfserr_resource;
4750 goto out;
4751 }
4752 }
4753 out:
4754 return nfserr;
4755 }
4756
4757 static __be32
4758 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4759 union nfsd4_op_u *u)
4760 {
4761 struct nfsd4_write *write = &u->write;
4762 struct xdr_stream *xdr = resp->xdr;
4763
4764 /* count */
4765 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4766 if (nfserr)
4767 return nfserr;
4768 /* committed */
4769 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT)
4770 return nfserr_resource;
4771 /* writeverf */
4772 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
4773 }
4774
4775 static __be32
4776 nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4777 struct nfsd4_exchange_id *exid)
4778 {
4779 __be32 status;
4780
4781 /* spo_must_enforce */
4782 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0],
4783 exid->spo_must_enforce[1],
4784 exid->spo_must_enforce[2]);
4785 if (status != nfs_ok)
4786 return status;
4787 /* spo_must_allow */
4788 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0],
4789 exid->spo_must_allow[1],
4790 exid->spo_must_allow[2]);
4791 }
4792
4793 static __be32
4794 nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4795 {
4796 __be32 status;
4797
4798 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT)
4799 return nfserr_resource;
4800 switch (exid->spa_how) {
4801 case SP4_NONE:
4802 status = nfs_ok;
4803 break;
4804 case SP4_MACH_CRED:
4805 /* spr_mach_ops */
4806 status = nfsd4_encode_state_protect_ops4(xdr, exid);
4807 break;
4808 default:
4809 status = nfserr_serverfault;
4810 }
4811 return status;
4812 }
4813
4814 static __be32
4815 nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4816 {
4817 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4818 __be32 status;
4819
4820 /* so_minor_id */
4821 status = nfsd4_encode_uint64_t(xdr, 0);
4822 if (status != nfs_ok)
4823 return status;
4824 /* so_major_id */
4825 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name));
4826 }
4827
4828 static __be32
4829 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4830 union nfsd4_op_u *u)
4831 {
4832 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4833 struct nfsd4_exchange_id *exid = &u->exchange_id;
4834 struct xdr_stream *xdr = resp->xdr;
4835
4836 /* eir_clientid */
4837 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid);
4838 if (nfserr != nfs_ok)
4839 return nfserr;
4840 /* eir_sequenceid */
4841 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4842 if (nfserr != nfs_ok)
4843 return nfserr;
4844 /* eir_flags */
4845 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags);
4846 if (nfserr != nfs_ok)
4847 return nfserr;
4848 /* eir_state_protect */
4849 nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4850 if (nfserr != nfs_ok)
4851 return nfserr;
4852 /* eir_server_owner */
4853 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp);
4854 if (nfserr != nfs_ok)
4855 return nfserr;
4856 /* eir_server_scope */
4857 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name,
4858 strlen(nn->nfsd_name));
4859 if (nfserr != nfs_ok)
4860 return nfserr;
4861 /* eir_server_impl_id<1> */
4862 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4863 return nfserr_resource;
4864
4865 return nfs_ok;
4866 }
4867
4868 static __be32
4869 nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4870 const struct nfsd4_channel_attrs *attrs)
4871 {
4872 __be32 status;
4873
4874 /* ca_headerpadsize */
4875 status = nfsd4_encode_count4(xdr, 0);
4876 if (status != nfs_ok)
4877 return status;
4878 /* ca_maxrequestsize */
4879 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4880 if (status != nfs_ok)
4881 return status;
4882 /* ca_maxresponsesize */
4883 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4884 if (status != nfs_ok)
4885 return status;
4886 /* ca_maxresponsesize_cached */
4887 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4888 if (status != nfs_ok)
4889 return status;
4890 /* ca_maxoperations */
4891 status = nfsd4_encode_count4(xdr, attrs->maxops);
4892 if (status != nfs_ok)
4893 return status;
4894 /* ca_maxrequests */
4895 status = nfsd4_encode_count4(xdr, attrs->maxreqs);
4896 if (status != nfs_ok)
4897 return status;
4898 /* ca_rdma_ird<1> */
4899 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT)
4900 return nfserr_resource;
4901 if (attrs->nr_rdma_attrs)
4902 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs);
4903 return nfs_ok;
4904 }
4905
4906 static __be32
4907 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4908 union nfsd4_op_u *u)
4909 {
4910 struct nfsd4_create_session *sess = &u->create_session;
4911 struct xdr_stream *xdr = resp->xdr;
4912
4913 /* csr_sessionid */
4914 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid);
4915 if (nfserr != nfs_ok)
4916 return nfserr;
4917 /* csr_sequence */
4918 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
4919 if (nfserr != nfs_ok)
4920 return nfserr;
4921 /* csr_flags */
4922 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags);
4923 if (nfserr != nfs_ok)
4924 return nfserr;
4925 /* csr_fore_chan_attrs */
4926 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel);
4927 if (nfserr != nfs_ok)
4928 return nfserr;
4929 /* csr_back_chan_attrs */
4930 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel);
4931 }
4932
4933 static __be32
4934 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4935 union nfsd4_op_u *u)
4936 {
4937 struct nfsd4_sequence *seq = &u->sequence;
4938 struct xdr_stream *xdr = resp->xdr;
4939
4940 /* sr_sessionid */
4941 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid);
4942 if (nfserr != nfs_ok)
4943 return nfserr;
4944 /* sr_sequenceid */
4945 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
4946 if (nfserr != nfs_ok)
4947 return nfserr;
4948 /* sr_slotid */
4949 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
4950 if (nfserr != nfs_ok)
4951 return nfserr;
4952 /* Note slotid's are numbered from zero: */
4953 /* sr_highest_slotid */
4954 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4955 if (nfserr != nfs_ok)
4956 return nfserr;
4957 /* sr_target_highest_slotid */
4958 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4959 if (nfserr != nfs_ok)
4960 return nfserr;
4961 /* sr_status_flags */
4962 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags);
4963 if (nfserr != nfs_ok)
4964 return nfserr;
4965
4966 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4967 return nfs_ok;
4968 }
4969
4970 static __be32
4971 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4972 union nfsd4_op_u *u)
4973 {
4974 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4975 struct nfsd4_test_stateid_id *stateid, *next;
4976 struct xdr_stream *xdr = resp->xdr;
4977
4978 /* tsr_status_codes<> */
4979 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT)
4980 return nfserr_resource;
4981 list_for_each_entry_safe(stateid, next,
4982 &test_stateid->ts_stateid_list, ts_id_list) {
4983 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT)
4984 return nfserr_resource;
4985 }
4986 return nfs_ok;
4987 }
4988
4989 static __be32
4990 nfsd4_encode_get_dir_delegation(struct nfsd4_compoundres *resp, __be32 nfserr,
4991 union nfsd4_op_u *u)
4992 {
4993 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
4994 struct xdr_stream *xdr = resp->xdr;
4995 __be32 status = nfserr_resource;
4996
4997 switch(gdd->gddrnf_status) {
4998 case GDD4_OK:
4999 if (xdr_stream_encode_u32(xdr, GDD4_OK) != XDR_UNIT)
5000 break;
5001 status = nfsd4_encode_verifier4(xdr, &gdd->gddr_cookieverf);
5002 if (status)
5003 break;
5004 status = nfsd4_encode_stateid4(xdr, &gdd->gddr_stateid);
5005 if (status)
5006 break;
5007 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_notification[0], 0, 0);
5008 if (status)
5009 break;
5010 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_child_attributes[0],
5011 gdd->gddr_child_attributes[1],
5012 gdd->gddr_child_attributes[2]);
5013 if (status)
5014 break;
5015 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_dir_attributes[0],
5016 gdd->gddr_dir_attributes[1],
5017 gdd->gddr_dir_attributes[2]);
5018 break;
5019 default:
5020 pr_warn("nfsd: bad gddrnf_status (%u)\n", gdd->gddrnf_status);
5021 gdd->gddrnf_will_signal_deleg_avail = 0;
5022 fallthrough;
5023 case GDD4_UNAVAIL:
5024 if (xdr_stream_encode_u32(xdr, GDD4_UNAVAIL) != XDR_UNIT)
5025 break;
5026 status = nfsd4_encode_bool(xdr, gdd->gddrnf_will_signal_deleg_avail);
5027 break;
5028 }
5029 return status;
5030 }
5031
5032 #ifdef CONFIG_NFSD_PNFS
5033 static __be32
5034 nfsd4_encode_device_addr4(struct xdr_stream *xdr,
5035 const struct nfsd4_getdeviceinfo *gdev)
5036 {
5037 u32 needed_len, starting_len = xdr->buf->len;
5038 const struct nfsd4_layout_ops *ops;
5039 __be32 status;
5040
5041 /* da_layout_type */
5042 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT)
5043 return nfserr_resource;
5044 /* da_addr_body */
5045 ops = nfsd4_layout_ops[gdev->gd_layout_type];
5046 status = ops->encode_getdeviceinfo(xdr, gdev);
5047 if (status != nfs_ok) {
5048 /*
5049 * Don't burden the layout drivers with enforcing
5050 * gd_maxcount. Just tell the client to come back
5051 * with a bigger buffer if it's not enough.
5052 */
5053 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
5054 goto toosmall;
5055 return status;
5056 }
5057
5058 return nfs_ok;
5059
5060 toosmall:
5061 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
5062 xdr_truncate_encode(xdr, starting_len);
5063
5064 status = nfsd4_encode_count4(xdr, needed_len);
5065 if (status != nfs_ok)
5066 return status;
5067 return nfserr_toosmall;
5068 }
5069
5070 static __be32
5071 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5072 union nfsd4_op_u *u)
5073 {
5074 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5075 struct xdr_stream *xdr = resp->xdr;
5076
5077 /* gdir_device_addr */
5078 nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5079 if (nfserr)
5080 return nfserr;
5081 /* gdir_notification */
5082 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0);
5083 }
5084
5085 static __be32
5086 nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5087 {
5088 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5089 __be32 status;
5090
5091 /* lo_offset */
5092 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5093 if (status != nfs_ok)
5094 return status;
5095 /* lo_length */
5096 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5097 if (status != nfs_ok)
5098 return status;
5099 /* lo_iomode */
5100 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT)
5101 return nfserr_resource;
5102 /* lo_content */
5103 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT)
5104 return nfserr_resource;
5105 return ops->encode_layoutget(xdr, lgp);
5106 }
5107
5108 static __be32
5109 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5110 union nfsd4_op_u *u)
5111 {
5112 struct nfsd4_layoutget *lgp = &u->layoutget;
5113 struct xdr_stream *xdr = resp->xdr;
5114
5115 /* logr_return_on_close */
5116 nfserr = nfsd4_encode_bool(xdr, true);
5117 if (nfserr != nfs_ok)
5118 return nfserr;
5119 /* logr_stateid */
5120 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid);
5121 if (nfserr != nfs_ok)
5122 return nfserr;
5123 /* logr_layout<> */
5124 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5125 return nfserr_resource;
5126 return nfsd4_encode_layout4(xdr, lgp);
5127 }
5128
5129 static __be32
5130 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5131 union nfsd4_op_u *u)
5132 {
5133 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5134 struct xdr_stream *xdr = resp->xdr;
5135
5136 /* ns_sizechanged */
5137 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg);
5138 if (nfserr != nfs_ok)
5139 return nfserr;
5140 if (lcp->lc_size_chg)
5141 /* ns_size */
5142 return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5143 return nfs_ok;
5144 }
5145
5146 static __be32
5147 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5148 union nfsd4_op_u *u)
5149 {
5150 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5151 struct xdr_stream *xdr = resp->xdr;
5152
5153 /* lrs_present */
5154 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present);
5155 if (nfserr != nfs_ok)
5156 return nfserr;
5157 if (lrp->lrs_present)
5158 /* lrs_stateid */
5159 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid);
5160 return nfs_ok;
5161 }
5162 #endif /* CONFIG_NFSD_PNFS */
5163
5164 static __be32
5165 nfsd4_encode_write_response4(struct xdr_stream *xdr,
5166 const struct nfsd4_copy *copy)
5167 {
5168 const struct nfsd42_write_res *write = ©->cp_res;
5169 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5170 __be32 status;
5171
5172 /* wr_callback_id<1> */
5173 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT)
5174 return nfserr_resource;
5175 if (count) {
5176 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid);
5177 if (status != nfs_ok)
5178 return status;
5179 }
5180
5181 /* wr_count */
5182 status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5183 if (status != nfs_ok)
5184 return status;
5185 /* wr_committed */
5186 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT)
5187 return nfserr_resource;
5188 /* wr_writeverf */
5189 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
5190 }
5191
5192 static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5193 const struct nfsd4_copy *copy)
5194 {
5195 __be32 status;
5196
5197 /* cr_consecutive */
5198 status = nfsd4_encode_bool(xdr, true);
5199 if (status != nfs_ok)
5200 return status;
5201 /* cr_synchronous */
5202 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy));
5203 }
5204
5205 static __be32
5206 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5207 union nfsd4_op_u *u)
5208 {
5209 struct nfsd4_copy *copy = &u->copy;
5210
5211 nfserr = nfsd4_encode_write_response4(resp->xdr, copy);
5212 if (nfserr != nfs_ok)
5213 return nfserr;
5214 return nfsd4_encode_copy_requirements4(resp->xdr, copy);
5215 }
5216
5217 static __be32
5218 nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5219 {
5220 __be32 status;
5221
5222 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT)
5223 return nfserr_resource;
5224 switch (ns->nl4_type) {
5225 case NL4_NETADDR:
5226 /* nl_addr */
5227 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr);
5228 break;
5229 default:
5230 status = nfserr_serverfault;
5231 }
5232 return status;
5233 }
5234
5235 static __be32
5236 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5237 union nfsd4_op_u *u)
5238 {
5239 struct nfsd4_copy_notify *cn = &u->copy_notify;
5240 struct xdr_stream *xdr = resp->xdr;
5241
5242 /* cnr_lease_time */
5243 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time);
5244 if (nfserr)
5245 return nfserr;
5246 /* cnr_stateid */
5247 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid);
5248 if (nfserr)
5249 return nfserr;
5250 /* cnr_source_server<> */
5251 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5252 return nfserr_resource;
5253 return nfsd4_encode_netloc4(xdr, cn->cpn_src);
5254 }
5255
5256 static __be32
5257 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5258 union nfsd4_op_u *u)
5259 {
5260 struct nfsd4_offload_status *os = &u->offload_status;
5261 struct xdr_stream *xdr = resp->xdr;
5262
5263 /* osr_count */
5264 nfserr = nfsd4_encode_length4(xdr, os->count);
5265 if (nfserr != nfs_ok)
5266 return nfserr;
5267 /* osr_complete<1> */
5268 if (os->completed) {
5269 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5270 return nfserr_resource;
5271 if (xdr_stream_encode_be32(xdr, os->status) != XDR_UNIT)
5272 return nfserr_resource;
5273 } else if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
5274 return nfserr_resource;
5275 return nfs_ok;
5276 }
5277
5278 static __be32
5279 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5280 struct nfsd4_read *read)
5281 {
5282 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
5283 struct file *file = read->rd_nf->nf_file;
5284 struct xdr_stream *xdr = resp->xdr;
5285 bool splice_ok = argp->splice_ok;
5286 unsigned long maxcount;
5287 __be32 nfserr, *p;
5288
5289 /* Content type, offset, byte count */
5290 p = xdr_reserve_space(xdr, 4 + 8 + 4);
5291 if (!p)
5292 return nfserr_io;
5293 if (resp->xdr->buf->page_len && splice_ok) {
5294 WARN_ON_ONCE(splice_ok);
5295 return nfserr_serverfault;
5296 }
5297
5298 maxcount = min_t(unsigned long, read->rd_length,
5299 (xdr->buf->buflen - xdr->buf->len));
5300
5301 if (file->f_op->splice_read && splice_ok)
5302 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5303 else
5304 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5305 if (nfserr)
5306 return nfserr;
5307
5308 *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
5309 p = xdr_encode_hyper(p, read->rd_offset);
5310 *p = cpu_to_be32(read->rd_length);
5311
5312 return nfs_ok;
5313 }
5314
5315 static __be32
5316 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5317 union nfsd4_op_u *u)
5318 {
5319 struct nfsd4_read *read = &u->read;
5320 struct file *file = read->rd_nf->nf_file;
5321 struct xdr_stream *xdr = resp->xdr;
5322 int starting_len = xdr->buf->len;
5323 u32 segments = 0;
5324 __be32 *p;
5325
5326 if (nfserr)
5327 return nfserr;
5328
5329 /* eof flag, segment count */
5330 p = xdr_reserve_space(xdr, 4 + 4);
5331 if (!p)
5332 return nfserr_io;
5333 xdr_commit_encode(xdr);
5334
5335 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
5336 if (read->rd_eof)
5337 goto out;
5338
5339 nfserr = nfsd4_encode_read_plus_data(resp, read);
5340 if (nfserr) {
5341 xdr_truncate_encode(xdr, starting_len);
5342 return nfserr;
5343 }
5344
5345 segments++;
5346
5347 out:
5348 p = xdr_encode_bool(p, read->rd_eof);
5349 *p = cpu_to_be32(segments);
5350 return nfserr;
5351 }
5352
5353 static __be32
5354 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5355 union nfsd4_op_u *u)
5356 {
5357 struct nfsd4_seek *seek = &u->seek;
5358 struct xdr_stream *xdr = resp->xdr;
5359
5360 /* sr_eof */
5361 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof);
5362 if (nfserr != nfs_ok)
5363 return nfserr;
5364 /* sr_offset */
5365 return nfsd4_encode_offset4(xdr, seek->seek_pos);
5366 }
5367
5368 static __be32
5369 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5370 union nfsd4_op_u *p)
5371 {
5372 return nfserr;
5373 }
5374
5375 /*
5376 * Encode kmalloc-ed buffer in to XDR stream.
5377 */
5378 static __be32
5379 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5380 {
5381 u32 cplen;
5382 __be32 *p;
5383
5384 cplen = min_t(unsigned long, buflen,
5385 ((void *)xdr->end - (void *)xdr->p));
5386 p = xdr_reserve_space(xdr, cplen);
5387 if (!p)
5388 return nfserr_resource;
5389
5390 memcpy(p, buf, cplen);
5391 buf += cplen;
5392 buflen -= cplen;
5393
5394 while (buflen) {
5395 cplen = min_t(u32, buflen, PAGE_SIZE);
5396 p = xdr_reserve_space(xdr, cplen);
5397 if (!p)
5398 return nfserr_resource;
5399
5400 memcpy(p, buf, cplen);
5401
5402 if (cplen < PAGE_SIZE) {
5403 /*
5404 * We're done, with a length that wasn't page
5405 * aligned, so possibly not word aligned. Pad
5406 * any trailing bytes with 0.
5407 */
5408 xdr_encode_opaque_fixed(p, NULL, cplen);
5409 break;
5410 }
5411
5412 buflen -= PAGE_SIZE;
5413 buf += PAGE_SIZE;
5414 }
5415
5416 return 0;
5417 }
5418
5419 static __be32
5420 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5421 union nfsd4_op_u *u)
5422 {
5423 struct nfsd4_getxattr *getxattr = &u->getxattr;
5424 struct xdr_stream *xdr = resp->xdr;
5425 __be32 *p, err;
5426
5427 p = xdr_reserve_space(xdr, 4);
5428 if (!p)
5429 return nfserr_resource;
5430
5431 *p = cpu_to_be32(getxattr->getxa_len);
5432
5433 if (getxattr->getxa_len == 0)
5434 return 0;
5435
5436 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5437 getxattr->getxa_len);
5438
5439 kvfree(getxattr->getxa_buf);
5440
5441 return err;
5442 }
5443
5444 static __be32
5445 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5446 union nfsd4_op_u *u)
5447 {
5448 struct nfsd4_setxattr *setxattr = &u->setxattr;
5449 struct xdr_stream *xdr = resp->xdr;
5450
5451 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo);
5452 }
5453
5454 /*
5455 * See if there are cookie values that can be rejected outright.
5456 */
5457 static __be32
5458 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5459 u32 *offsetp)
5460 {
5461 u64 cookie = listxattrs->lsxa_cookie;
5462
5463 /*
5464 * If the cookie is larger than the maximum number we can fit
5465 * in the buffer we just got back from vfs_listxattr, it's invalid.
5466 */
5467 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5468 return nfserr_badcookie;
5469
5470 *offsetp = (u32)cookie;
5471 return 0;
5472 }
5473
5474 static __be32
5475 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5476 union nfsd4_op_u *u)
5477 {
5478 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5479 struct xdr_stream *xdr = resp->xdr;
5480 u32 cookie_offset, count_offset, eof;
5481 u32 left, xdrleft, slen, count;
5482 u32 xdrlen, offset;
5483 u64 cookie;
5484 char *sp;
5485 __be32 status, tmp;
5486 __be64 wire_cookie;
5487 __be32 *p;
5488 u32 nuser;
5489
5490 eof = 1;
5491
5492 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5493 if (status)
5494 goto out;
5495
5496 /*
5497 * Reserve space for the cookie and the name array count. Record
5498 * the offsets to save them later.
5499 */
5500 cookie_offset = xdr->buf->len;
5501 count_offset = cookie_offset + 8;
5502 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
5503 if (!p) {
5504 status = nfserr_resource;
5505 goto out;
5506 }
5507
5508 count = 0;
5509 left = listxattrs->lsxa_len;
5510 sp = listxattrs->lsxa_buf;
5511 nuser = 0;
5512
5513 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */
5514 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3;
5515
5516 while (left > 0 && xdrleft > 0) {
5517 slen = strlen(sp);
5518
5519 /*
5520 * Check if this is a "user." attribute, skip it if not.
5521 */
5522 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5523 goto contloop;
5524
5525 slen -= XATTR_USER_PREFIX_LEN;
5526 xdrlen = 4 + ((slen + 3) & ~3);
5527 /* Check if both entry and eof can fit in the XDR buffer */
5528 if (xdrlen + XDR_UNIT > xdrleft) {
5529 if (count == 0) {
5530 /*
5531 * Can't even fit the first attribute name.
5532 */
5533 status = nfserr_toosmall;
5534 goto out;
5535 }
5536 eof = 0;
5537 goto wreof;
5538 }
5539
5540 left -= XATTR_USER_PREFIX_LEN;
5541 sp += XATTR_USER_PREFIX_LEN;
5542 if (nuser++ < offset)
5543 goto contloop;
5544
5545
5546 p = xdr_reserve_space(xdr, xdrlen);
5547 if (!p) {
5548 status = nfserr_resource;
5549 goto out;
5550 }
5551
5552 xdr_encode_opaque(p, sp, slen);
5553
5554 xdrleft -= xdrlen;
5555 count++;
5556 contloop:
5557 sp += slen + 1;
5558 left -= slen + 1;
5559 }
5560
5561 /*
5562 * If there were user attributes to copy, but we didn't copy
5563 * any, the offset was too large (e.g. the cookie was invalid).
5564 */
5565 if (nuser > 0 && count == 0) {
5566 status = nfserr_badcookie;
5567 goto out;
5568 }
5569
5570 wreof:
5571 p = xdr_reserve_space(xdr, 4);
5572 if (!p) {
5573 status = nfserr_resource;
5574 goto out;
5575 }
5576 *p = cpu_to_be32(eof);
5577
5578 cookie = offset + count;
5579
5580 wire_cookie = cpu_to_be64(cookie);
5581 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8);
5582 tmp = cpu_to_be32(count);
5583 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5584 out:
5585 if (listxattrs->lsxa_len)
5586 kvfree(listxattrs->lsxa_buf);
5587 return status;
5588 }
5589
5590 static __be32
5591 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5592 union nfsd4_op_u *u)
5593 {
5594 struct nfsd4_removexattr *removexattr = &u->removexattr;
5595 struct xdr_stream *xdr = resp->xdr;
5596
5597 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo);
5598 }
5599
5600 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5601
5602 /*
5603 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5604 * since we don't need to filter out obsolete ops as this is
5605 * done in the decoding phase.
5606 */
5607 static const nfsd4_enc nfsd4_enc_ops[] = {
5608 [OP_ACCESS] = nfsd4_encode_access,
5609 [OP_CLOSE] = nfsd4_encode_close,
5610 [OP_COMMIT] = nfsd4_encode_commit,
5611 [OP_CREATE] = nfsd4_encode_create,
5612 [OP_DELEGPURGE] = nfsd4_encode_noop,
5613 [OP_DELEGRETURN] = nfsd4_encode_noop,
5614 [OP_GETATTR] = nfsd4_encode_getattr,
5615 [OP_GETFH] = nfsd4_encode_getfh,
5616 [OP_LINK] = nfsd4_encode_link,
5617 [OP_LOCK] = nfsd4_encode_lock,
5618 [OP_LOCKT] = nfsd4_encode_lockt,
5619 [OP_LOCKU] = nfsd4_encode_locku,
5620 [OP_LOOKUP] = nfsd4_encode_noop,
5621 [OP_LOOKUPP] = nfsd4_encode_noop,
5622 [OP_NVERIFY] = nfsd4_encode_noop,
5623 [OP_OPEN] = nfsd4_encode_open,
5624 [OP_OPENATTR] = nfsd4_encode_noop,
5625 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5626 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5627 [OP_PUTFH] = nfsd4_encode_noop,
5628 [OP_PUTPUBFH] = nfsd4_encode_noop,
5629 [OP_PUTROOTFH] = nfsd4_encode_noop,
5630 [OP_READ] = nfsd4_encode_read,
5631 [OP_READDIR] = nfsd4_encode_readdir,
5632 [OP_READLINK] = nfsd4_encode_readlink,
5633 [OP_REMOVE] = nfsd4_encode_remove,
5634 [OP_RENAME] = nfsd4_encode_rename,
5635 [OP_RENEW] = nfsd4_encode_noop,
5636 [OP_RESTOREFH] = nfsd4_encode_noop,
5637 [OP_SAVEFH] = nfsd4_encode_noop,
5638 [OP_SECINFO] = nfsd4_encode_secinfo,
5639 [OP_SETATTR] = nfsd4_encode_setattr,
5640 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5641 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5642 [OP_VERIFY] = nfsd4_encode_noop,
5643 [OP_WRITE] = nfsd4_encode_write,
5644 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5645
5646 /* NFSv4.1 operations */
5647 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5648 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5649 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5650 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5651 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5652 [OP_FREE_STATEID] = nfsd4_encode_noop,
5653 [OP_GET_DIR_DELEGATION] = nfsd4_encode_get_dir_delegation,
5654 #ifdef CONFIG_NFSD_PNFS
5655 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5656 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5657 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5658 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5659 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5660 #else
5661 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5662 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5663 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5664 [OP_LAYOUTGET] = nfsd4_encode_noop,
5665 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
5666 #endif
5667 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5668 [OP_SEQUENCE] = nfsd4_encode_sequence,
5669 [OP_SET_SSV] = nfsd4_encode_noop,
5670 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5671 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5672 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5673 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5674
5675 /* NFSv4.2 operations */
5676 [OP_ALLOCATE] = nfsd4_encode_noop,
5677 [OP_COPY] = nfsd4_encode_copy,
5678 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5679 [OP_DEALLOCATE] = nfsd4_encode_noop,
5680 [OP_IO_ADVISE] = nfsd4_encode_noop,
5681 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5682 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5683 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5684 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5685 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5686 [OP_SEEK] = nfsd4_encode_seek,
5687 [OP_WRITE_SAME] = nfsd4_encode_noop,
5688 [OP_CLONE] = nfsd4_encode_noop,
5689
5690 /* RFC 8276 extended atributes operations */
5691 [OP_GETXATTR] = nfsd4_encode_getxattr,
5692 [OP_SETXATTR] = nfsd4_encode_setxattr,
5693 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5694 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5695 };
5696
5697 /*
5698 * Calculate whether we still have space to encode repsize bytes.
5699 * There are two considerations:
5700 * - For NFS versions >=4.1, the size of the reply must stay within
5701 * session limits
5702 * - For all NFS versions, we must stay within limited preallocated
5703 * buffer space.
5704 *
5705 * This is called before the operation is processed, so can only provide
5706 * an upper estimate. For some nonidempotent operations (such as
5707 * getattr), it's not necessarily a problem if that estimate is wrong,
5708 * as we can fail it after processing without significant side effects.
5709 */
5710 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5711 {
5712 struct xdr_buf *buf = &resp->rqstp->rq_res;
5713 struct nfsd4_slot *slot = resp->cstate.slot;
5714
5715 if (buf->len + respsize <= buf->buflen)
5716 return nfs_ok;
5717 if (!nfsd4_has_session(&resp->cstate))
5718 return nfserr_resource;
5719 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5720 WARN_ON_ONCE(1);
5721 return nfserr_rep_too_big_to_cache;
5722 }
5723 return nfserr_rep_too_big;
5724 }
5725
5726 void
5727 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5728 {
5729 struct xdr_stream *xdr = resp->xdr;
5730 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5731 struct svc_rqst *rqstp = resp->rqstp;
5732 const struct nfsd4_operation *opdesc = op->opdesc;
5733 int post_err_offset;
5734 nfsd4_enc encoder;
5735 __be32 *p;
5736
5737 p = xdr_reserve_space(xdr, 8);
5738 if (!p)
5739 goto release;
5740 *p++ = cpu_to_be32(op->opnum);
5741 post_err_offset = xdr->buf->len;
5742
5743 if (op->opnum == OP_ILLEGAL)
5744 goto status;
5745 if (op->status && opdesc &&
5746 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5747 goto status;
5748 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5749 !nfsd4_enc_ops[op->opnum]);
5750 encoder = nfsd4_enc_ops[op->opnum];
5751 op->status = encoder(resp, op->status, &op->u);
5752 if (op->status)
5753 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5754 xdr_commit_encode(xdr);
5755
5756 /* nfsd4_check_resp_size guarantees enough room for error status */
5757 if (!op->status) {
5758 int space_needed = 0;
5759 if (!nfsd4_last_compound_op(rqstp))
5760 space_needed = COMPOUND_ERR_SLACK_SPACE;
5761 op->status = nfsd4_check_resp_size(resp, space_needed);
5762 }
5763 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5764 struct nfsd4_slot *slot = resp->cstate.slot;
5765
5766 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5767 op->status = nfserr_rep_too_big_to_cache;
5768 else
5769 op->status = nfserr_rep_too_big;
5770 }
5771 if (op->status == nfserr_resource ||
5772 op->status == nfserr_rep_too_big ||
5773 op->status == nfserr_rep_too_big_to_cache) {
5774 /*
5775 * The operation may have already been encoded or
5776 * partially encoded. No op returns anything additional
5777 * in the case of one of these three errors, so we can
5778 * just truncate back to after the status. But it's a
5779 * bug if we had to do this on a non-idempotent op:
5780 */
5781 warn_on_nonidempotent_op(op);
5782 xdr_truncate_encode(xdr, post_err_offset);
5783 }
5784 if (so) {
5785 int len = xdr->buf->len - post_err_offset;
5786
5787 so->so_replay.rp_status = op->status;
5788 so->so_replay.rp_buflen = len;
5789 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5790 so->so_replay.rp_buf, len);
5791 }
5792 status:
5793 *p = op->status;
5794 release:
5795 if (opdesc && opdesc->op_release)
5796 opdesc->op_release(&op->u);
5797
5798 /*
5799 * Account for pages consumed while encoding this operation.
5800 * The xdr_stream primitives don't manage rq_next_page.
5801 */
5802 rqstp->rq_next_page = xdr->page_ptr + 1;
5803 }
5804
5805 /**
5806 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache
5807 * @xdr: send buffer's XDR stream
5808 * @op: operation being replayed
5809 *
5810 * @op->replay->rp_buf contains the previously-sent already-encoded result.
5811 */
5812 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5813 {
5814 struct nfs4_replay *rp = op->replay;
5815
5816 trace_nfsd_stateowner_replay(op->opnum, rp);
5817
5818 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT)
5819 return;
5820 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT)
5821 return;
5822 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen);
5823 }
5824
5825 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5826 {
5827 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5828
5829 if (args->ops != args->iops) {
5830 vfree(args->ops);
5831 args->ops = args->iops;
5832 }
5833 while (args->to_free) {
5834 struct svcxdr_tmpbuf *tb = args->to_free;
5835 args->to_free = tb->next;
5836 kfree(tb);
5837 }
5838 }
5839
5840 bool
5841 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5842 {
5843 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5844
5845 /* svcxdr_tmp_alloc */
5846 args->to_free = NULL;
5847
5848 args->xdr = xdr;
5849 args->ops = args->iops;
5850 args->rqstp = rqstp;
5851
5852 return nfsd4_decode_compound(args);
5853 }
5854
5855 bool
5856 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5857 {
5858 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5859 __be32 *p;
5860
5861 /*
5862 * Send buffer space for the following items is reserved
5863 * at the top of nfsd4_proc_compound().
5864 */
5865 p = resp->statusp;
5866
5867 *p++ = resp->cstate.status;
5868 *p++ = htonl(resp->taglen);
5869 memcpy(p, resp->tag, resp->taglen);
5870 p += XDR_QUADLEN(resp->taglen);
5871 *p++ = htonl(resp->opcnt);
5872
5873 nfsd4_sequence_done(resp);
5874 return true;
5875 }
5876
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