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accel/qaic: Add AIC200 support
[drm/drm-misc.git] / fs / nfsd / nfs4xdr.c
blob53fac037611c05ff8ba2618f9e324a9cb54c3890
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, &copy->cp_src_stateid);
2007 if (status)
2008 return status;
2009 status = nfsd4_decode_stateid4(argp, &copy->cp_dst_stateid);
2010 if (status)
2011 return status;
2012 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_src_pos) < 0)
2013 return nfserr_bad_xdr;
2014 if (xdr_stream_decode_u64(argp->xdr, &copy->cp_dst_pos) < 0)
2015 return nfserr_bad_xdr;
2016 if (xdr_stream_decode_u64(argp->xdr, &copy->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, &copy->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 if (xdr_stream_encode_opaque(xdr, str, strlen) < 0)
2656 return nfserr_resource;
2657 count++;
2658 } else
2659 end++;
2660 if (found_esc)
2661 end = next;
2662
2663 str = end;
2664 }
2665 pathlen = htonl(count);
2666 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2667 return 0;
2668 }
2669
2670 /* Encode as an array of strings the string given with components
2671 * separated @sep.
2672 */
2673 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2674 char *components)
2675 {
2676 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2677 }
2678
2679 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2680 struct nfsd4_fs_location *location)
2681 {
2682 __be32 status;
2683
2684 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2685 '[', ']');
2686 if (status)
2687 return status;
2688 status = nfsd4_encode_components(xdr, '/', location->path);
2689 if (status)
2690 return status;
2691 return nfs_ok;
2692 }
2693
2694 static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2695 const struct path *root,
2696 const struct path *path)
2697 {
2698 struct path cur = *path;
2699 struct dentry **components = NULL;
2700 unsigned int ncomponents = 0;
2701 __be32 err = nfserr_jukebox;
2702
2703 dprintk("nfsd4_encode_components(");
2704
2705 path_get(&cur);
2706 /* First walk the path up to the nfsd root, and store the
2707 * dentries/path components in an array.
2708 */
2709 for (;;) {
2710 if (path_equal(&cur, root))
2711 break;
2712 if (cur.dentry == cur.mnt->mnt_root) {
2713 if (follow_up(&cur))
2714 continue;
2715 goto out_free;
2716 }
2717 if ((ncomponents & 15) == 0) {
2718 struct dentry **new;
2719 new = krealloc(components,
2720 sizeof(*new) * (ncomponents + 16),
2721 GFP_KERNEL);
2722 if (!new)
2723 goto out_free;
2724 components = new;
2725 }
2726 components[ncomponents++] = cur.dentry;
2727 cur.dentry = dget_parent(cur.dentry);
2728 }
2729
2730 err = nfserr_resource;
2731 if (xdr_stream_encode_u32(xdr, ncomponents) != XDR_UNIT)
2732 goto out_free;
2733 while (ncomponents) {
2734 struct dentry *dentry = components[ncomponents - 1];
2735
2736 spin_lock(&dentry->d_lock);
2737 if (xdr_stream_encode_opaque(xdr, dentry->d_name.name,
2738 dentry->d_name.len) < 0) {
2739 spin_unlock(&dentry->d_lock);
2740 goto out_free;
2741 }
2742 dprintk("/%pd", dentry);
2743 spin_unlock(&dentry->d_lock);
2744 dput(dentry);
2745 ncomponents--;
2746 }
2747
2748 err = 0;
2749 out_free:
2750 dprintk(")\n");
2751 while (ncomponents)
2752 dput(components[--ncomponents]);
2753 kfree(components);
2754 path_put(&cur);
2755 return err;
2756 }
2757
2758 static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2759 struct svc_rqst *rqstp,
2760 struct svc_export *exp)
2761 {
2762 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2763 struct svc_export *exp_ps;
2764 unsigned int i;
2765 __be32 status;
2766
2767 /* fs_root */
2768 exp_ps = rqst_find_fsidzero_export(rqstp);
2769 if (IS_ERR(exp_ps))
2770 return nfserrno(PTR_ERR(exp_ps));
2771 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path);
2772 exp_put(exp_ps);
2773 if (status != nfs_ok)
2774 return status;
2775
2776 /* locations<> */
2777 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT)
2778 return nfserr_resource;
2779 for (i = 0; i < fslocs->locations_count; i++) {
2780 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2781 if (status != nfs_ok)
2782 return status;
2783 }
2784
2785 return nfs_ok;
2786 }
2787
2788 static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2789 struct nfs4_ace *ace)
2790 {
2791 __be32 status;
2792
2793 /* type */
2794 status = nfsd4_encode_acetype4(xdr, ace->type);
2795 if (status != nfs_ok)
2796 return nfserr_resource;
2797 /* flag */
2798 status = nfsd4_encode_aceflag4(xdr, ace->flag);
2799 if (status != nfs_ok)
2800 return nfserr_resource;
2801 /* access mask */
2802 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2803 if (status != nfs_ok)
2804 return nfserr_resource;
2805 /* who */
2806 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2807 return nfs4_acl_write_who(xdr, ace->whotype);
2808 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2809 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2810 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2811 }
2812
2813 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2814 FATTR4_WORD0_RDATTR_ERROR)
2815 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2816 #define WORD2_ABSENT_FS_ATTRS 0
2817
2818 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2819 static inline __be32
2820 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2821 void *context, int len)
2822 {
2823 __be32 *p;
2824
2825 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2826 if (!p)
2827 return nfserr_resource;
2828
2829 /*
2830 * For now we use a 0 here to indicate the null translation; in
2831 * the future we may place a call to translation code here.
2832 */
2833 *p++ = cpu_to_be32(0); /* lfs */
2834 *p++ = cpu_to_be32(0); /* pi */
2835 p = xdr_encode_opaque(p, context, len);
2836 return 0;
2837 }
2838 #else
2839 static inline __be32
2840 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2841 void *context, int len)
2842 { return 0; }
2843 #endif
2844
2845 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2846 {
2847 /* As per referral draft: */
2848 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2849 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2850 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2851 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2852 *rdattr_err = NFSERR_MOVED;
2853 else
2854 return nfserr_moved;
2855 }
2856 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2857 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2858 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2859 return 0;
2860 }
2861
2862
2863 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2864 {
2865 struct path path = exp->ex_path;
2866 struct kstat stat;
2867 int err;
2868
2869 path_get(&path);
2870 while (follow_up(&path)) {
2871 if (path.dentry != path.mnt->mnt_root)
2872 break;
2873 }
2874 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2875 path_put(&path);
2876 if (!err)
2877 *pino = stat.ino;
2878 return err;
2879 }
2880
2881 static __be32
2882 nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2883 {
2884 __be32 *p;
2885
2886 if (bmval2) {
2887 p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2888 if (!p)
2889 goto out_resource;
2890 *p++ = cpu_to_be32(3);
2891 *p++ = cpu_to_be32(bmval0);
2892 *p++ = cpu_to_be32(bmval1);
2893 *p++ = cpu_to_be32(bmval2);
2894 } else if (bmval1) {
2895 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2896 if (!p)
2897 goto out_resource;
2898 *p++ = cpu_to_be32(2);
2899 *p++ = cpu_to_be32(bmval0);
2900 *p++ = cpu_to_be32(bmval1);
2901 } else {
2902 p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2903 if (!p)
2904 goto out_resource;
2905 *p++ = cpu_to_be32(1);
2906 *p++ = cpu_to_be32(bmval0);
2907 }
2908
2909 return nfs_ok;
2910 out_resource:
2911 return nfserr_resource;
2912 }
2913
2914 struct nfsd4_fattr_args {
2915 struct svc_rqst *rqstp;
2916 struct svc_fh *fhp;
2917 struct svc_export *exp;
2918 struct dentry *dentry;
2919 struct kstat stat;
2920 struct kstatfs statfs;
2921 struct nfs4_acl *acl;
2922 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2923 void *context;
2924 int contextlen;
2925 #endif
2926 u32 rdattr_err;
2927 bool contextsupport;
2928 bool ignore_crossmnt;
2929 };
2930
2931 typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2932 const struct nfsd4_fattr_args *args);
2933
2934 static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2935 const struct nfsd4_fattr_args *args)
2936 {
2937 return nfs_ok;
2938 }
2939
2940 static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2941 const struct nfsd4_fattr_args *args)
2942 {
2943 return nfsd4_encode_bool(xdr, true);
2944 }
2945
2946 static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2947 const struct nfsd4_fattr_args *args)
2948 {
2949 return nfsd4_encode_bool(xdr, false);
2950 }
2951
2952 static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2953 const struct nfsd4_fattr_args *args)
2954 {
2955 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2956 u32 minorversion = resp->cstate.minorversion;
2957 u32 supp[3];
2958
2959 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2960 if (!IS_POSIXACL(d_inode(args->dentry)))
2961 supp[0] &= ~FATTR4_WORD0_ACL;
2962 if (!args->contextsupport)
2963 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2964
2965 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
2966 }
2967
2968 static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2969 const struct nfsd4_fattr_args *args)
2970 {
2971 __be32 *p;
2972
2973 p = xdr_reserve_space(xdr, XDR_UNIT);
2974 if (!p)
2975 return nfserr_resource;
2976
2977 switch (args->stat.mode & S_IFMT) {
2978 case S_IFIFO:
2979 *p = cpu_to_be32(NF4FIFO);
2980 break;
2981 case S_IFCHR:
2982 *p = cpu_to_be32(NF4CHR);
2983 break;
2984 case S_IFDIR:
2985 *p = cpu_to_be32(NF4DIR);
2986 break;
2987 case S_IFBLK:
2988 *p = cpu_to_be32(NF4BLK);
2989 break;
2990 case S_IFLNK:
2991 *p = cpu_to_be32(NF4LNK);
2992 break;
2993 case S_IFREG:
2994 *p = cpu_to_be32(NF4REG);
2995 break;
2996 case S_IFSOCK:
2997 *p = cpu_to_be32(NF4SOCK);
2998 break;
2999 default:
3000 return nfserr_serverfault;
3001 }
3002
3003 return nfs_ok;
3004 }
3005
3006 static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
3007 const struct nfsd4_fattr_args *args)
3008 {
3009 u32 mask;
3010
3011 mask = NFS4_FH_PERSISTENT;
3012 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3013 mask |= NFS4_FH_VOL_RENAME;
3014 return nfsd4_encode_uint32_t(xdr, mask);
3015 }
3016
3017 static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3018 const struct nfsd4_fattr_args *args)
3019 {
3020 const struct svc_export *exp = args->exp;
3021 u64 c;
3022
3023 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3024 u32 flush_time = convert_to_wallclock(exp->cd->flush_time);
3025
3026 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT)
3027 return nfserr_resource;
3028 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3029 return nfserr_resource;
3030 return nfs_ok;
3031 }
3032
3033 c = nfsd4_change_attribute(&args->stat);
3034 return nfsd4_encode_changeid4(xdr, c);
3035 }
3036
3037 static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3038 const struct nfsd4_fattr_args *args)
3039 {
3040 return nfsd4_encode_uint64_t(xdr, args->stat.size);
3041 }
3042
3043 static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3044 const struct nfsd4_fattr_args *args)
3045 {
3046 __be32 *p;
3047
3048 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3049 if (!p)
3050 return nfserr_resource;
3051
3052 if (unlikely(args->exp->ex_fslocs.migrated)) {
3053 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3054 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3055 return nfs_ok;
3056 }
3057 switch (fsid_source(args->fhp)) {
3058 case FSIDSOURCE_FSID:
3059 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid);
3060 xdr_encode_hyper(p, (u64)0);
3061 break;
3062 case FSIDSOURCE_DEV:
3063 *p++ = xdr_zero;
3064 *p++ = cpu_to_be32(MAJOR(args->stat.dev));
3065 *p++ = xdr_zero;
3066 *p = cpu_to_be32(MINOR(args->stat.dev));
3067 break;
3068 case FSIDSOURCE_UUID:
3069 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN);
3070 break;
3071 }
3072
3073 return nfs_ok;
3074 }
3075
3076 static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3077 const struct nfsd4_fattr_args *args)
3078 {
3079 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id);
3080
3081 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3082 }
3083
3084 static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3085 const struct nfsd4_fattr_args *args)
3086 {
3087 return nfsd4_encode_uint32_t(xdr, args->rdattr_err);
3088 }
3089
3090 static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3091 const struct nfsd4_fattr_args *args)
3092 {
3093 u32 mask;
3094
3095 mask = 0;
3096 if (IS_POSIXACL(d_inode(args->dentry)))
3097 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3098 return nfsd4_encode_uint32_t(xdr, mask);
3099 }
3100
3101 static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3102 const struct nfsd4_fattr_args *args)
3103 {
3104 struct nfs4_acl *acl = args->acl;
3105 struct nfs4_ace *ace;
3106 __be32 status;
3107
3108 /* nfsace4<> */
3109 if (!acl) {
3110 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3111 return nfserr_resource;
3112 } else {
3113 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT)
3114 return nfserr_resource;
3115 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3116 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace);
3117 if (status != nfs_ok)
3118 return status;
3119 }
3120 }
3121 return nfs_ok;
3122 }
3123
3124 static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3125 const struct nfsd4_fattr_args *args)
3126 {
3127 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle);
3128 }
3129
3130 static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3131 const struct nfsd4_fattr_args *args)
3132 {
3133 return nfsd4_encode_uint64_t(xdr, args->stat.ino);
3134 }
3135
3136 static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3137 const struct nfsd4_fattr_args *args)
3138 {
3139 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3140 }
3141
3142 static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3143 const struct nfsd4_fattr_args *args)
3144 {
3145 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3146 }
3147
3148 static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3149 const struct nfsd4_fattr_args *args)
3150 {
3151 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files);
3152 }
3153
3154 static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3155 const struct nfsd4_fattr_args *args)
3156 {
3157 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp);
3158 }
3159
3160 static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3161 const struct nfsd4_fattr_args *args)
3162 {
3163 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3164
3165 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes);
3166 }
3167
3168 static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3169 const struct nfsd4_fattr_args *args)
3170 {
3171 return nfsd4_encode_uint32_t(xdr, 255);
3172 }
3173
3174 static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3175 const struct nfsd4_fattr_args *args)
3176 {
3177 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen);
3178 }
3179
3180 static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3181 const struct nfsd4_fattr_args *args)
3182 {
3183 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3184 }
3185
3186 static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3187 const struct nfsd4_fattr_args *args)
3188 {
3189 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3190 }
3191
3192 static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3193 const struct nfsd4_fattr_args *args)
3194 {
3195 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3196 }
3197
3198 static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3199 const struct nfsd4_fattr_args *args)
3200 {
3201 return nfsd4_encode_uint32_t(xdr, args->stat.nlink);
3202 }
3203
3204 static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3205 const struct nfsd4_fattr_args *args)
3206 {
3207 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3208 }
3209
3210 static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3211 const struct nfsd4_fattr_args *args)
3212 {
3213 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3214 }
3215
3216 static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3217 const struct nfsd4_fattr_args *args)
3218 {
3219 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3220 MINOR(args->stat.rdev));
3221 }
3222
3223 static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3224 const struct nfsd4_fattr_args *args)
3225 {
3226 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3227
3228 return nfsd4_encode_uint64_t(xdr, avail);
3229 }
3230
3231 static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3232 const struct nfsd4_fattr_args *args)
3233 {
3234 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3235
3236 return nfsd4_encode_uint64_t(xdr, free);
3237 }
3238
3239 static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3240 const struct nfsd4_fattr_args *args)
3241 {
3242 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3243
3244 return nfsd4_encode_uint64_t(xdr, total);
3245 }
3246
3247 static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3248 const struct nfsd4_fattr_args *args)
3249 {
3250 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9);
3251 }
3252
3253 static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3254 const struct nfsd4_fattr_args *args)
3255 {
3256 return nfsd4_encode_nfstime4(xdr, &args->stat.atime);
3257 }
3258
3259 static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3260 const struct nfsd4_fattr_args *args)
3261 {
3262 return nfsd4_encode_nfstime4(xdr, &args->stat.btime);
3263 }
3264
3265 /*
3266 * ctime (in NFSv4, time_metadata) is not writeable, and the client
3267 * doesn't really care what resolution could theoretically be stored by
3268 * the filesystem.
3269 *
3270 * The client cares how close together changes can be while still
3271 * guaranteeing ctime changes. For most filesystems (which have
3272 * timestamps with nanosecond fields) that is limited by the resolution
3273 * of the time returned from current_time() (which I'm assuming to be
3274 * 1/HZ).
3275 */
3276 static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3277 const struct nfsd4_fattr_args *args)
3278 {
3279 const struct inode *inode = d_inode(args->dentry);
3280 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3281 struct timespec64 ts = ns_to_timespec64(ns);
3282
3283 return nfsd4_encode_nfstime4(xdr, &ts);
3284 }
3285
3286 static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3287 const struct nfsd4_fattr_args *args)
3288 {
3289 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime);
3290 }
3291
3292 static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3293 const struct nfsd4_fattr_args *args)
3294 {
3295 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime);
3296 }
3297
3298 static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3299 const struct nfsd4_fattr_args *args)
3300 {
3301 u64 ino;
3302 int err;
3303
3304 if (!args->ignore_crossmnt &&
3305 args->dentry == args->exp->ex_path.mnt->mnt_root) {
3306 err = nfsd4_get_mounted_on_ino(args->exp, &ino);
3307 if (err)
3308 return nfserrno(err);
3309 } else
3310 ino = args->stat.ino;
3311
3312 return nfsd4_encode_uint64_t(xdr, ino);
3313 }
3314
3315 #ifdef CONFIG_NFSD_PNFS
3316
3317 static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3318 const struct nfsd4_fattr_args *args)
3319 {
3320 unsigned long mask = args->exp->ex_layout_types;
3321 int i;
3322
3323 /* Hamming weight of @mask is the number of layout types to return */
3324 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3325 return nfserr_resource;
3326 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3327 if (mask & BIT(i)) {
3328 /* layouttype4 */
3329 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3330 return nfserr_resource;
3331 }
3332 return nfs_ok;
3333 }
3334
3335 static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3336 const struct nfsd4_fattr_args *args)
3337 {
3338 unsigned long mask = args->exp->ex_layout_types;
3339 int i;
3340
3341 /* Hamming weight of @mask is the number of layout types to return */
3342 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3343 return nfserr_resource;
3344 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3345 if (mask & BIT(i)) {
3346 /* layouttype4 */
3347 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3348 return nfserr_resource;
3349 }
3350 return nfs_ok;
3351 }
3352
3353 static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3354 const struct nfsd4_fattr_args *args)
3355 {
3356 return nfsd4_encode_uint32_t(xdr, args->stat.blksize);
3357 }
3358
3359 #endif
3360
3361 static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3362 const struct nfsd4_fattr_args *args)
3363 {
3364 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3365 u32 supp[3];
3366
3367 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3368 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3369 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3370 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3371
3372 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
3373 }
3374
3375 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3376 static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3377 const struct nfsd4_fattr_args *args)
3378 {
3379 return nfsd4_encode_security_label(xdr, args->rqstp,
3380 args->context, args->contextlen);
3381 }
3382 #endif
3383
3384 static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3385 const struct nfsd4_fattr_args *args)
3386 {
3387 int err = xattr_supports_user_prefix(d_inode(args->dentry));
3388
3389 return nfsd4_encode_bool(xdr, err == 0);
3390 }
3391
3392 static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3393 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3394 [FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3395 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3396 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3397 [FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3398 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3399 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3400 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3401 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3402 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3403 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3404 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3405 [FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3406 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3407 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3408 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3409 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3410 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3411 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3412 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3413 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3414 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3415 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3416 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3417 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3418 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3419 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3420 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3421 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3422 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3423 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3424 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3425 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3426 [FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3427 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3428 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3429 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3430 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3431 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3432 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3433 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3434 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3435 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3436 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3437 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3438 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3439 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3440 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3441 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3442 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3443 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3444 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3445 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3446 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3447 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3448 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3449 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3450 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3451 [FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3452 [FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3453 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3454 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3455
3456 #ifdef CONFIG_NFSD_PNFS
3457 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3458 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3459 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3460 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3461 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3462 #else
3463 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3464 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3465 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3466 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3467 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3468 #endif
3469
3470 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3471 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3472 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3473 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3474 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3475 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3476 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3477 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3478 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3479 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3480 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3481 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3482 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3483
3484 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3485 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3486 #else
3487 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3488 #endif
3489
3490 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3491 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3492 };
3493
3494 /*
3495 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3496 * ourselves.
3497 */
3498 static __be32
3499 nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3500 struct svc_fh *fhp, struct svc_export *exp,
3501 struct dentry *dentry, const u32 *bmval,
3502 int ignore_crossmnt)
3503 {
3504 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3505 struct nfs4_delegation *dp = NULL;
3506 struct nfsd4_fattr_args args;
3507 struct svc_fh *tempfh = NULL;
3508 int starting_len = xdr->buf->len;
3509 __be32 *attrlen_p, status;
3510 int attrlen_offset;
3511 u32 attrmask[3];
3512 int err;
3513 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3514 u32 minorversion = resp->cstate.minorversion;
3515 struct path path = {
3516 .mnt = exp->ex_path.mnt,
3517 .dentry = dentry,
3518 };
3519 unsigned long bit;
3520
3521 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3522 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3523
3524 args.rqstp = rqstp;
3525 args.exp = exp;
3526 args.dentry = dentry;
3527 args.ignore_crossmnt = (ignore_crossmnt != 0);
3528 args.acl = NULL;
3529 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3530 args.context = NULL;
3531 #endif
3532
3533 /*
3534 * Make a local copy of the attribute bitmap that can be modified.
3535 */
3536 attrmask[0] = bmval[0];
3537 attrmask[1] = bmval[1];
3538 attrmask[2] = bmval[2];
3539
3540 args.rdattr_err = 0;
3541 if (exp->ex_fslocs.migrated) {
3542 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1],
3543 &attrmask[2], &args.rdattr_err);
3544 if (status)
3545 goto out;
3546 }
3547 if (attrmask[0] & (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE)) {
3548 status = nfsd4_deleg_getattr_conflict(rqstp, dentry, &dp);
3549 if (status)
3550 goto out;
3551 }
3552
3553 err = vfs_getattr(&path, &args.stat,
3554 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3555 AT_STATX_SYNC_AS_STAT);
3556 if (dp) {
3557 struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr;
3558
3559 if (ncf->ncf_file_modified)
3560 args.stat.size = ncf->ncf_cur_fsize;
3561
3562 nfs4_put_stid(&dp->dl_stid);
3563 }
3564 if (err)
3565 goto out_nfserr;
3566
3567 if (!(args.stat.result_mask & STATX_BTIME))
3568 /* underlying FS does not offer btime so we can't share it */
3569 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3570 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3571 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3572 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3573 FATTR4_WORD1_SPACE_TOTAL))) {
3574 err = vfs_statfs(&path, &args.statfs);
3575 if (err)
3576 goto out_nfserr;
3577 }
3578 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3579 !fhp) {
3580 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
3581 status = nfserr_jukebox;
3582 if (!tempfh)
3583 goto out;
3584 fh_init(tempfh, NFS4_FHSIZE);
3585 status = fh_compose(tempfh, exp, dentry, NULL);
3586 if (status)
3587 goto out;
3588 args.fhp = tempfh;
3589 } else
3590 args.fhp = fhp;
3591
3592 if (attrmask[0] & FATTR4_WORD0_ACL) {
3593 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
3594 if (err == -EOPNOTSUPP)
3595 attrmask[0] &= ~FATTR4_WORD0_ACL;
3596 else if (err == -EINVAL) {
3597 status = nfserr_attrnotsupp;
3598 goto out;
3599 } else if (err != 0)
3600 goto out_nfserr;
3601 }
3602
3603 args.contextsupport = false;
3604
3605 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3606 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3607 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3608 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3609 err = security_inode_getsecctx(d_inode(dentry),
3610 &args.context, &args.contextlen);
3611 else
3612 err = -EOPNOTSUPP;
3613 args.contextsupport = (err == 0);
3614 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3615 if (err == -EOPNOTSUPP)
3616 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3617 else if (err)
3618 goto out_nfserr;
3619 }
3620 }
3621 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3622
3623 /* attrmask */
3624 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1],
3625 attrmask[2]);
3626 if (status)
3627 goto out;
3628
3629 /* attr_vals */
3630 attrlen_offset = xdr->buf->len;
3631 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3632 if (!attrlen_p)
3633 goto out_resource;
3634 bitmap_from_arr32(attr_bitmap, attrmask,
3635 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3636 for_each_set_bit(bit, attr_bitmap,
3637 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3638 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3639 if (status != nfs_ok)
3640 goto out;
3641 }
3642 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3643 status = nfs_ok;
3644
3645 out:
3646 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3647 if (args.context)
3648 security_release_secctx(args.context, args.contextlen);
3649 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3650 kfree(args.acl);
3651 if (tempfh) {
3652 fh_put(tempfh);
3653 kfree(tempfh);
3654 }
3655 if (status)
3656 xdr_truncate_encode(xdr, starting_len);
3657 return status;
3658 out_nfserr:
3659 status = nfserrno(err);
3660 goto out;
3661 out_resource:
3662 status = nfserr_resource;
3663 goto out;
3664 }
3665
3666 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3667 struct xdr_buf *buf, __be32 *p, int bytes)
3668 {
3669 xdr->scratch.iov_len = 0;
3670 memset(buf, 0, sizeof(struct xdr_buf));
3671 buf->head[0].iov_base = p;
3672 buf->head[0].iov_len = 0;
3673 buf->len = 0;
3674 xdr->buf = buf;
3675 xdr->iov = buf->head;
3676 xdr->p = p;
3677 xdr->end = (void *)p + bytes;
3678 buf->buflen = bytes;
3679 }
3680
3681 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3682 struct svc_fh *fhp, struct svc_export *exp,
3683 struct dentry *dentry, u32 *bmval,
3684 struct svc_rqst *rqstp, int ignore_crossmnt)
3685 {
3686 struct xdr_buf dummy;
3687 struct xdr_stream xdr;
3688 __be32 ret;
3689
3690 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3691 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval,
3692 ignore_crossmnt);
3693 *p = xdr.p;
3694 return ret;
3695 }
3696
3697 /*
3698 * The buffer space for this field was reserved during a previous
3699 * call to nfsd4_encode_entry4().
3700 */
3701 static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3702 u64 offset)
3703 {
3704 __be64 cookie = cpu_to_be64(offset);
3705 struct xdr_stream *xdr = readdir->xdr;
3706
3707 if (!readdir->cookie_offset)
3708 return;
3709 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3710 sizeof(cookie));
3711 }
3712
3713 static inline int attributes_need_mount(u32 *bmval)
3714 {
3715 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3716 return 1;
3717 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3718 return 1;
3719 return 0;
3720 }
3721
3722 static __be32
3723 nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3724 int namlen)
3725 {
3726 struct svc_export *exp = cd->rd_fhp->fh_export;
3727 struct dentry *dentry;
3728 __be32 nfserr;
3729 int ignore_crossmnt = 0;
3730
3731 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3732 if (IS_ERR(dentry))
3733 return nfserrno(PTR_ERR(dentry));
3734
3735 exp_get(exp);
3736 /*
3737 * In the case of a mountpoint, the client may be asking for
3738 * attributes that are only properties of the underlying filesystem
3739 * as opposed to the cross-mounted file system. In such a case,
3740 * we will not follow the cross mount and will fill the attribtutes
3741 * directly from the mountpoint dentry.
3742 */
3743 if (nfsd_mountpoint(dentry, exp)) {
3744 int err;
3745
3746 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3747 && !attributes_need_mount(cd->rd_bmval)) {
3748 ignore_crossmnt = 1;
3749 goto out_encode;
3750 }
3751 /*
3752 * Why the heck aren't we just using nfsd_lookup??
3753 * Different "."/".." handling? Something else?
3754 * At least, add a comment here to explain....
3755 */
3756 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3757 if (err) {
3758 nfserr = nfserrno(err);
3759 goto out_put;
3760 }
3761 nfserr = check_nfsd_access(exp, cd->rd_rqstp, false);
3762 if (nfserr)
3763 goto out_put;
3764
3765 }
3766 out_encode:
3767 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry,
3768 cd->rd_bmval, ignore_crossmnt);
3769 out_put:
3770 dput(dentry);
3771 exp_put(exp);
3772 return nfserr;
3773 }
3774
3775 static __be32
3776 nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3777 {
3778 __be32 status;
3779
3780 /* attrmask */
3781 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0);
3782 if (status != nfs_ok)
3783 return status;
3784 /* attr_vals */
3785 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3786 return nfserr_resource;
3787 /* rdattr_error */
3788 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT)
3789 return nfserr_resource;
3790 return nfs_ok;
3791 }
3792
3793 static int
3794 nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3795 loff_t offset, u64 ino, unsigned int d_type)
3796 {
3797 struct readdir_cd *ccd = ccdv;
3798 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3799 struct xdr_stream *xdr = cd->xdr;
3800 int start_offset = xdr->buf->len;
3801 int cookie_offset;
3802 u32 name_and_cookie;
3803 int entry_bytes;
3804 __be32 nfserr = nfserr_toosmall;
3805
3806 /* In nfsv4, "." and ".." never make it onto the wire.. */
3807 if (name && isdotent(name, namlen)) {
3808 cd->common.err = nfs_ok;
3809 return 0;
3810 }
3811
3812 /* Encode the previous entry's cookie value */
3813 nfsd4_encode_entry4_nfs_cookie4(cd, offset);
3814
3815 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3816 goto fail;
3817
3818 /* Reserve send buffer space for this entry's cookie value. */
3819 cookie_offset = xdr->buf->len;
3820 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3821 goto fail;
3822 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3823 goto fail;
3824 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3825 switch (nfserr) {
3826 case nfs_ok:
3827 break;
3828 case nfserr_resource:
3829 nfserr = nfserr_toosmall;
3830 goto fail;
3831 case nfserr_noent:
3832 xdr_truncate_encode(xdr, start_offset);
3833 goto skip_entry;
3834 case nfserr_jukebox:
3835 /*
3836 * The pseudoroot should only display dentries that lead to
3837 * exports. If we get EJUKEBOX here, then we can't tell whether
3838 * this entry should be included. Just fail the whole READDIR
3839 * with NFS4ERR_DELAY in that case, and hope that the situation
3840 * will resolve itself by the client's next attempt.
3841 */
3842 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3843 goto fail;
3844 fallthrough;
3845 default:
3846 /*
3847 * If the client requested the RDATTR_ERROR attribute,
3848 * we stuff the error code into this attribute
3849 * and continue. If this attribute was not requested,
3850 * then in accordance with the spec, we fail the
3851 * entire READDIR operation(!)
3852 */
3853 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3854 goto fail;
3855 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3856 nfserr = nfserr_toosmall;
3857 goto fail;
3858 }
3859 }
3860 nfserr = nfserr_toosmall;
3861 entry_bytes = xdr->buf->len - start_offset;
3862 if (entry_bytes > cd->rd_maxcount)
3863 goto fail;
3864 cd->rd_maxcount -= entry_bytes;
3865 /*
3866 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3867 * notes that it could be zero. If it is zero, then the server
3868 * should enforce only the rd_maxcount value.
3869 */
3870 if (cd->rd_dircount) {
3871 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3872 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3873 goto fail;
3874 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3875 if (!cd->rd_dircount)
3876 cd->rd_maxcount = 0;
3877 }
3878
3879 cd->cookie_offset = cookie_offset;
3880 skip_entry:
3881 cd->common.err = nfs_ok;
3882 return 0;
3883 fail:
3884 xdr_truncate_encode(xdr, start_offset);
3885 cd->common.err = nfserr;
3886 return -EINVAL;
3887 }
3888
3889 static __be32
3890 nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3891 {
3892 __be32 *p;
3893
3894 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3895 if (!p)
3896 return nfserr_resource;
3897 memcpy(p, verf->data, sizeof(verf->data));
3898 return nfs_ok;
3899 }
3900
3901 static __be32
3902 nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3903 {
3904 __be32 *p;
3905
3906 p = xdr_reserve_space(xdr, sizeof(__be64));
3907 if (!p)
3908 return nfserr_resource;
3909 memcpy(p, clientid, sizeof(*clientid));
3910 return nfs_ok;
3911 }
3912
3913 /* This is a frequently-encoded item; open-coded for speed */
3914 static __be32
3915 nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
3916 {
3917 __be32 *p;
3918
3919 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
3920 if (!p)
3921 return nfserr_resource;
3922 *p++ = cpu_to_be32(sid->si_generation);
3923 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
3924 return nfs_ok;
3925 }
3926
3927 static __be32
3928 nfsd4_encode_sessionid4(struct xdr_stream *xdr,
3929 const struct nfs4_sessionid *sessionid)
3930 {
3931 return nfsd4_encode_opaque_fixed(xdr, sessionid->data,
3932 NFS4_MAX_SESSIONID_LEN);
3933 }
3934
3935 static __be32
3936 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3937 union nfsd4_op_u *u)
3938 {
3939 struct nfsd4_access *access = &u->access;
3940 struct xdr_stream *xdr = resp->xdr;
3941 __be32 status;
3942
3943 /* supported */
3944 status = nfsd4_encode_uint32_t(xdr, access->ac_supported);
3945 if (status != nfs_ok)
3946 return status;
3947 /* access */
3948 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access);
3949 }
3950
3951 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3952 union nfsd4_op_u *u)
3953 {
3954 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3955 struct xdr_stream *xdr = resp->xdr;
3956
3957 /* bctsr_sessid */
3958 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid);
3959 if (nfserr != nfs_ok)
3960 return nfserr;
3961 /* bctsr_dir */
3962 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT)
3963 return nfserr_resource;
3964 /* bctsr_use_conn_in_rdma_mode */
3965 return nfsd4_encode_bool(xdr, false);
3966 }
3967
3968 static __be32
3969 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3970 union nfsd4_op_u *u)
3971 {
3972 struct nfsd4_close *close = &u->close;
3973 struct xdr_stream *xdr = resp->xdr;
3974
3975 /* open_stateid */
3976 return nfsd4_encode_stateid4(xdr, &close->cl_stateid);
3977 }
3978
3979
3980 static __be32
3981 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3982 union nfsd4_op_u *u)
3983 {
3984 struct nfsd4_commit *commit = &u->commit;
3985
3986 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf);
3987 }
3988
3989 static __be32
3990 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3991 union nfsd4_op_u *u)
3992 {
3993 struct nfsd4_create *create = &u->create;
3994 struct xdr_stream *xdr = resp->xdr;
3995
3996 /* cinfo */
3997 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo);
3998 if (nfserr)
3999 return nfserr;
4000 /* attrset */
4001 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0],
4002 create->cr_bmval[1], create->cr_bmval[2]);
4003 }
4004
4005 static __be32
4006 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4007 union nfsd4_op_u *u)
4008 {
4009 struct nfsd4_getattr *getattr = &u->getattr;
4010 struct svc_fh *fhp = getattr->ga_fhp;
4011 struct xdr_stream *xdr = resp->xdr;
4012
4013 /* obj_attributes */
4014 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export,
4015 fhp->fh_dentry, getattr->ga_bmval, 0);
4016 }
4017
4018 static __be32
4019 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4020 union nfsd4_op_u *u)
4021 {
4022 struct xdr_stream *xdr = resp->xdr;
4023 struct svc_fh *fhp = u->getfh;
4024
4025 /* object */
4026 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle);
4027 }
4028
4029 static __be32
4030 nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4031 const struct xdr_netobj *owner)
4032 {
4033 __be32 status;
4034
4035 /* clientid */
4036 status = nfsd4_encode_clientid4(xdr, clientid);
4037 if (status != nfs_ok)
4038 return status;
4039 /* owner */
4040 return nfsd4_encode_opaque(xdr, owner->data, owner->len);
4041 }
4042
4043 static __be32
4044 nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4045 const struct nfsd4_lock_denied *ld)
4046 {
4047 __be32 status;
4048
4049 /* offset */
4050 status = nfsd4_encode_offset4(xdr, ld->ld_start);
4051 if (status != nfs_ok)
4052 return status;
4053 /* length */
4054 status = nfsd4_encode_length4(xdr, ld->ld_length);
4055 if (status != nfs_ok)
4056 return status;
4057 /* locktype */
4058 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT)
4059 return nfserr_resource;
4060 /* owner */
4061 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
4062 &ld->ld_owner);
4063 }
4064
4065 static __be32
4066 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4067 union nfsd4_op_u *u)
4068 {
4069 struct nfsd4_lock *lock = &u->lock;
4070 struct xdr_stream *xdr = resp->xdr;
4071 __be32 status;
4072
4073 switch (nfserr) {
4074 case nfs_ok:
4075 /* resok4 */
4076 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
4077 break;
4078 case nfserr_denied:
4079 /* denied */
4080 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied);
4081 break;
4082 default:
4083 return nfserr;
4084 }
4085 return status != nfs_ok ? status : nfserr;
4086 }
4087
4088 static __be32
4089 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4090 union nfsd4_op_u *u)
4091 {
4092 struct nfsd4_lockt *lockt = &u->lockt;
4093 struct xdr_stream *xdr = resp->xdr;
4094 __be32 status;
4095
4096 if (nfserr == nfserr_denied) {
4097 /* denied */
4098 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied);
4099 if (status != nfs_ok)
4100 return status;
4101 }
4102 return nfserr;
4103 }
4104
4105 static __be32
4106 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4107 union nfsd4_op_u *u)
4108 {
4109 struct nfsd4_locku *locku = &u->locku;
4110 struct xdr_stream *xdr = resp->xdr;
4111
4112 /* lock_stateid */
4113 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid);
4114 }
4115
4116
4117 static __be32
4118 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4119 union nfsd4_op_u *u)
4120 {
4121 struct nfsd4_link *link = &u->link;
4122 struct xdr_stream *xdr = resp->xdr;
4123
4124 return nfsd4_encode_change_info4(xdr, &link->li_cinfo);
4125 }
4126
4127 /*
4128 * This implementation does not yet support returning an ACE in an
4129 * OPEN that offers a delegation.
4130 */
4131 static __be32
4132 nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4133 {
4134 __be32 status;
4135
4136 /* type */
4137 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4138 if (status != nfs_ok)
4139 return nfserr_resource;
4140 /* flag */
4141 status = nfsd4_encode_aceflag4(xdr, 0);
4142 if (status != nfs_ok)
4143 return nfserr_resource;
4144 /* access mask */
4145 status = nfsd4_encode_acemask4(xdr, 0);
4146 if (status != nfs_ok)
4147 return nfserr_resource;
4148 /* who - empty for now */
4149 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4150 return nfserr_resource;
4151 return nfs_ok;
4152 }
4153
4154 static __be32
4155 nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4156 {
4157 __be32 status;
4158
4159 /* stateid */
4160 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4161 if (status != nfs_ok)
4162 return status;
4163 /* recall */
4164 status = nfsd4_encode_bool(xdr, open->op_recall);
4165 if (status != nfs_ok)
4166 return status;
4167 /* permissions */
4168 return nfsd4_encode_open_nfsace4(xdr);
4169 }
4170
4171 static __be32
4172 nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4173 {
4174 /* limitby */
4175 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT)
4176 return nfserr_resource;
4177 /* filesize */
4178 return nfsd4_encode_uint64_t(xdr, filesize);
4179 }
4180
4181 static __be32
4182 nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4183 struct nfsd4_open *open)
4184 {
4185 __be32 status;
4186
4187 /* stateid */
4188 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4189 if (status != nfs_ok)
4190 return status;
4191 /* recall */
4192 status = nfsd4_encode_bool(xdr, open->op_recall);
4193 if (status != nfs_ok)
4194 return status;
4195 /* space_limit */
4196 status = nfsd4_encode_nfs_space_limit4(xdr, 0);
4197 if (status != nfs_ok)
4198 return status;
4199 return nfsd4_encode_open_nfsace4(xdr);
4200 }
4201
4202 static __be32
4203 nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4204 struct nfsd4_open *open)
4205 {
4206 __be32 status = nfs_ok;
4207
4208 /* ond_why */
4209 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT)
4210 return nfserr_resource;
4211 switch (open->op_why_no_deleg) {
4212 case WND4_CONTENTION:
4213 /* ond_server_will_push_deleg */
4214 status = nfsd4_encode_bool(xdr, false);
4215 break;
4216 case WND4_RESOURCE:
4217 /* ond_server_will_signal_avail */
4218 status = nfsd4_encode_bool(xdr, false);
4219 }
4220 return status;
4221 }
4222
4223 static __be32
4224 nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4225 {
4226 __be32 status;
4227
4228 /* delegation_type */
4229 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT)
4230 return nfserr_resource;
4231 switch (open->op_delegate_type) {
4232 case NFS4_OPEN_DELEGATE_NONE:
4233 status = nfs_ok;
4234 break;
4235 case NFS4_OPEN_DELEGATE_READ:
4236 /* read */
4237 status = nfsd4_encode_open_read_delegation4(xdr, open);
4238 break;
4239 case NFS4_OPEN_DELEGATE_WRITE:
4240 /* write */
4241 status = nfsd4_encode_open_write_delegation4(xdr, open);
4242 break;
4243 case NFS4_OPEN_DELEGATE_NONE_EXT:
4244 /* od_whynone */
4245 status = nfsd4_encode_open_none_delegation4(xdr, open);
4246 break;
4247 default:
4248 status = nfserr_serverfault;
4249 }
4250
4251 return status;
4252 }
4253
4254 static __be32
4255 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4256 union nfsd4_op_u *u)
4257 {
4258 struct nfsd4_open *open = &u->open;
4259 struct xdr_stream *xdr = resp->xdr;
4260
4261 /* stateid */
4262 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid);
4263 if (nfserr != nfs_ok)
4264 return nfserr;
4265 /* cinfo */
4266 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo);
4267 if (nfserr != nfs_ok)
4268 return nfserr;
4269 /* rflags */
4270 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags);
4271 if (nfserr != nfs_ok)
4272 return nfserr;
4273 /* attrset */
4274 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0],
4275 open->op_bmval[1], open->op_bmval[2]);
4276 if (nfserr != nfs_ok)
4277 return nfserr;
4278 /* delegation */
4279 return nfsd4_encode_open_delegation4(xdr, open);
4280 }
4281
4282 static __be32
4283 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4284 union nfsd4_op_u *u)
4285 {
4286 struct nfsd4_open_confirm *oc = &u->open_confirm;
4287 struct xdr_stream *xdr = resp->xdr;
4288
4289 /* open_stateid */
4290 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid);
4291 }
4292
4293 static __be32
4294 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4295 union nfsd4_op_u *u)
4296 {
4297 struct nfsd4_open_downgrade *od = &u->open_downgrade;
4298 struct xdr_stream *xdr = resp->xdr;
4299
4300 /* open_stateid */
4301 return nfsd4_encode_stateid4(xdr, &od->od_stateid);
4302 }
4303
4304 /*
4305 * The operation of this function assumes that this is the only
4306 * READ operation in the COMPOUND. If there are multiple READs,
4307 * we use nfsd4_encode_readv().
4308 */
4309 static __be32 nfsd4_encode_splice_read(
4310 struct nfsd4_compoundres *resp,
4311 struct nfsd4_read *read,
4312 struct file *file, unsigned long maxcount)
4313 {
4314 struct xdr_stream *xdr = resp->xdr;
4315 struct xdr_buf *buf = xdr->buf;
4316 int status, space_left;
4317 __be32 nfserr;
4318
4319 /*
4320 * Make sure there is room at the end of buf->head for
4321 * svcxdr_encode_opaque_pages() to create a tail buffer
4322 * to XDR-pad the payload.
4323 */
4324 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4325 return nfserr_resource;
4326
4327 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4328 file, read->rd_offset, &maxcount,
4329 &read->rd_eof);
4330 read->rd_length = maxcount;
4331 if (nfserr)
4332 goto out_err;
4333 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages,
4334 buf->page_base, maxcount);
4335 status = svc_encode_result_payload(read->rd_rqstp,
4336 buf->head[0].iov_len, maxcount);
4337 if (status) {
4338 nfserr = nfserrno(status);
4339 goto out_err;
4340 }
4341
4342 /*
4343 * Prepare to encode subsequent operations.
4344 *
4345 * xdr_truncate_encode() is not safe to use after a successful
4346 * splice read has been done, so the following stream
4347 * manipulations are open-coded.
4348 */
4349 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4350 buf->buflen - buf->len);
4351 buf->buflen = buf->len + space_left;
4352 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4353
4354 return nfs_ok;
4355
4356 out_err:
4357 /*
4358 * nfsd_splice_actor may have already messed with the
4359 * page length; reset it so as not to confuse
4360 * xdr_truncate_encode in our caller.
4361 */
4362 buf->page_len = 0;
4363 return nfserr;
4364 }
4365
4366 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4367 struct nfsd4_read *read,
4368 struct file *file, unsigned long maxcount)
4369 {
4370 struct xdr_stream *xdr = resp->xdr;
4371 unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4372 unsigned int starting_len = xdr->buf->len;
4373 __be32 zero = xdr_zero;
4374 __be32 nfserr;
4375
4376 if (xdr_reserve_space_vec(xdr, maxcount) < 0)
4377 return nfserr_resource;
4378
4379 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file,
4380 read->rd_offset, &maxcount, base,
4381 &read->rd_eof);
4382 read->rd_length = maxcount;
4383 if (nfserr)
4384 return nfserr;
4385 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4386 return nfserr_io;
4387 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4388
4389 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4390 xdr_pad_size(maxcount));
4391 return nfs_ok;
4392 }
4393
4394 static __be32
4395 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4396 union nfsd4_op_u *u)
4397 {
4398 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
4399 struct nfsd4_read *read = &u->read;
4400 struct xdr_stream *xdr = resp->xdr;
4401 int starting_len = xdr->buf->len;
4402 bool splice_ok = argp->splice_ok;
4403 unsigned long maxcount;
4404 struct file *file;
4405 __be32 *p;
4406
4407 if (nfserr)
4408 return nfserr;
4409 file = read->rd_nf->nf_file;
4410
4411 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4412 if (!p) {
4413 WARN_ON_ONCE(splice_ok);
4414 return nfserr_resource;
4415 }
4416 if (resp->xdr->buf->page_len && splice_ok) {
4417 WARN_ON_ONCE(1);
4418 return nfserr_serverfault;
4419 }
4420 xdr_commit_encode(xdr);
4421
4422 maxcount = min_t(unsigned long, read->rd_length,
4423 (xdr->buf->buflen - xdr->buf->len));
4424
4425 if (file->f_op->splice_read && splice_ok)
4426 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4427 else
4428 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4429 if (nfserr) {
4430 xdr_truncate_encode(xdr, starting_len);
4431 return nfserr;
4432 }
4433
4434 p = xdr_encode_bool(p, read->rd_eof);
4435 *p = cpu_to_be32(read->rd_length);
4436 return nfs_ok;
4437 }
4438
4439 static __be32
4440 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4441 union nfsd4_op_u *u)
4442 {
4443 struct nfsd4_readlink *readlink = &u->readlink;
4444 __be32 *p, *maxcount_p, zero = xdr_zero;
4445 struct xdr_stream *xdr = resp->xdr;
4446 int length_offset = xdr->buf->len;
4447 int maxcount, status;
4448
4449 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4450 if (!maxcount_p)
4451 return nfserr_resource;
4452 maxcount = PAGE_SIZE;
4453
4454 p = xdr_reserve_space(xdr, maxcount);
4455 if (!p)
4456 return nfserr_resource;
4457 /*
4458 * XXX: By default, vfs_readlink() will truncate symlinks if they
4459 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4460 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4461 * that truncation occurred, and return NFS4ERR_RESOURCE.
4462 */
4463 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4464 (char *)p, &maxcount);
4465 if (nfserr == nfserr_isdir)
4466 nfserr = nfserr_inval;
4467 if (nfserr)
4468 goto out_err;
4469 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4470 maxcount);
4471 if (status) {
4472 nfserr = nfserrno(status);
4473 goto out_err;
4474 }
4475 *maxcount_p = cpu_to_be32(maxcount);
4476 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4477 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4478 xdr_pad_size(maxcount));
4479 return nfs_ok;
4480
4481 out_err:
4482 xdr_truncate_encode(xdr, length_offset);
4483 return nfserr;
4484 }
4485
4486 static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4487 struct nfsd4_readdir *readdir,
4488 u32 max_payload)
4489 {
4490 int bytes_left, maxcount, starting_len = xdr->buf->len;
4491 loff_t offset;
4492 __be32 status;
4493
4494 /*
4495 * Number of bytes left for directory entries allowing for the
4496 * final 8 bytes of the readdir and a following failed op.
4497 */
4498 bytes_left = xdr->buf->buflen - xdr->buf->len -
4499 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4500 if (bytes_left < 0)
4501 return nfserr_resource;
4502 maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4503
4504 /*
4505 * The RFC defines rd_maxcount as the size of the
4506 * READDIR4resok structure, which includes the verifier
4507 * and the 8 bytes encoded at the end of this function.
4508 */
4509 if (maxcount < XDR_UNIT * 4)
4510 return nfserr_toosmall;
4511 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4512
4513 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4514 if (!readdir->rd_dircount)
4515 readdir->rd_dircount = max_payload;
4516
4517 /* *entries */
4518 readdir->xdr = xdr;
4519 readdir->rd_maxcount = maxcount;
4520 readdir->common.err = 0;
4521 readdir->cookie_offset = 0;
4522 offset = readdir->rd_cookie;
4523 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4524 &readdir->common, nfsd4_encode_entry4);
4525 if (status)
4526 return status;
4527 if (readdir->common.err == nfserr_toosmall &&
4528 xdr->buf->len == starting_len) {
4529 /* No entries were encoded. Which limit did we hit? */
4530 if (maxcount - XDR_UNIT * 4 < bytes_left)
4531 /* It was the fault of rd_maxcount */
4532 return nfserr_toosmall;
4533 /* We ran out of buffer space */
4534 return nfserr_resource;
4535 }
4536 /* Encode the final entry's cookie value */
4537 nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4538 /* No entries follow */
4539 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4540 return nfserr_resource;
4541
4542 /* eof */
4543 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof);
4544 }
4545
4546 static __be32
4547 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4548 union nfsd4_op_u *u)
4549 {
4550 struct nfsd4_readdir *readdir = &u->readdir;
4551 struct xdr_stream *xdr = resp->xdr;
4552 int starting_len = xdr->buf->len;
4553
4554 /* cookieverf */
4555 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf);
4556 if (nfserr != nfs_ok)
4557 return nfserr;
4558
4559 /* reply */
4560 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp));
4561 if (nfserr != nfs_ok)
4562 xdr_truncate_encode(xdr, starting_len);
4563 return nfserr;
4564 }
4565
4566 static __be32
4567 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4568 union nfsd4_op_u *u)
4569 {
4570 struct nfsd4_remove *remove = &u->remove;
4571 struct xdr_stream *xdr = resp->xdr;
4572
4573 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo);
4574 }
4575
4576 static __be32
4577 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4578 union nfsd4_op_u *u)
4579 {
4580 struct nfsd4_rename *rename = &u->rename;
4581 struct xdr_stream *xdr = resp->xdr;
4582
4583 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo);
4584 if (nfserr)
4585 return nfserr;
4586 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo);
4587 }
4588
4589 static __be32
4590 nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4591 struct rpcsec_gss_info *info)
4592 {
4593 __be32 status;
4594
4595 /* oid */
4596 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0)
4597 return nfserr_resource;
4598 /* qop */
4599 status = nfsd4_encode_qop4(xdr, info->qop);
4600 if (status != nfs_ok)
4601 return status;
4602 /* service */
4603 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT)
4604 return nfserr_resource;
4605
4606 return nfs_ok;
4607 }
4608
4609 static __be32
4610 nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4611 {
4612 u32 i, nflavs, supported;
4613 struct exp_flavor_info *flavs;
4614 struct exp_flavor_info def_flavs[2];
4615 static bool report = true;
4616 __be32 *flavorsp;
4617 __be32 status;
4618
4619 if (exp->ex_nflavors) {
4620 flavs = exp->ex_flavors;
4621 nflavs = exp->ex_nflavors;
4622 } else { /* Handling of some defaults in absence of real secinfo: */
4623 flavs = def_flavs;
4624 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4625 nflavs = 2;
4626 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4627 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4628 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4629 nflavs = 1;
4630 flavs[0].pseudoflavor
4631 = svcauth_gss_flavor(exp->ex_client);
4632 } else {
4633 nflavs = 1;
4634 flavs[0].pseudoflavor
4635 = exp->ex_client->flavour->flavour;
4636 }
4637 }
4638
4639 supported = 0;
4640 flavorsp = xdr_reserve_space(xdr, XDR_UNIT);
4641 if (!flavorsp)
4642 return nfserr_resource;
4643
4644 for (i = 0; i < nflavs; i++) {
4645 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4646 struct rpcsec_gss_info info;
4647
4648 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4649 supported++;
4650
4651 /* flavor */
4652 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS);
4653 if (status != nfs_ok)
4654 return status;
4655 /* flavor_info */
4656 status = nfsd4_encode_rpcsec_gss_info(xdr, &info);
4657 if (status != nfs_ok)
4658 return status;
4659 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4660 supported++;
4661
4662 /* flavor */
4663 status = nfsd4_encode_uint32_t(xdr, pf);
4664 if (status != nfs_ok)
4665 return status;
4666 } else {
4667 if (report)
4668 pr_warn("NFS: SECINFO: security flavor %u "
4669 "is not supported\n", pf);
4670 }
4671 }
4672
4673 if (nflavs != supported)
4674 report = false;
4675 *flavorsp = cpu_to_be32(supported);
4676 return 0;
4677 }
4678
4679 static __be32
4680 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4681 union nfsd4_op_u *u)
4682 {
4683 struct nfsd4_secinfo *secinfo = &u->secinfo;
4684 struct xdr_stream *xdr = resp->xdr;
4685
4686 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4687 }
4688
4689 static __be32
4690 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4691 union nfsd4_op_u *u)
4692 {
4693 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4694 struct xdr_stream *xdr = resp->xdr;
4695
4696 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4697 }
4698
4699 static __be32
4700 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4701 union nfsd4_op_u *u)
4702 {
4703 struct nfsd4_setattr *setattr = &u->setattr;
4704 __be32 status;
4705
4706 switch (nfserr) {
4707 case nfs_ok:
4708 /* attrsset */
4709 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0],
4710 setattr->sa_bmval[1],
4711 setattr->sa_bmval[2]);
4712 break;
4713 default:
4714 /* attrsset */
4715 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0);
4716 }
4717 return status != nfs_ok ? status : nfserr;
4718 }
4719
4720 static __be32
4721 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4722 union nfsd4_op_u *u)
4723 {
4724 struct nfsd4_setclientid *scd = &u->setclientid;
4725 struct xdr_stream *xdr = resp->xdr;
4726
4727 if (!nfserr) {
4728 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid);
4729 if (nfserr != nfs_ok)
4730 goto out;
4731 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm);
4732 } else if (nfserr == nfserr_clid_inuse) {
4733 /* empty network id */
4734 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4735 nfserr = nfserr_resource;
4736 goto out;
4737 }
4738 /* empty universal address */
4739 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4740 nfserr = nfserr_resource;
4741 goto out;
4742 }
4743 }
4744 out:
4745 return nfserr;
4746 }
4747
4748 static __be32
4749 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4750 union nfsd4_op_u *u)
4751 {
4752 struct nfsd4_write *write = &u->write;
4753 struct xdr_stream *xdr = resp->xdr;
4754
4755 /* count */
4756 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4757 if (nfserr)
4758 return nfserr;
4759 /* committed */
4760 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT)
4761 return nfserr_resource;
4762 /* writeverf */
4763 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
4764 }
4765
4766 static __be32
4767 nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4768 struct nfsd4_exchange_id *exid)
4769 {
4770 __be32 status;
4771
4772 /* spo_must_enforce */
4773 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0],
4774 exid->spo_must_enforce[1],
4775 exid->spo_must_enforce[2]);
4776 if (status != nfs_ok)
4777 return status;
4778 /* spo_must_allow */
4779 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0],
4780 exid->spo_must_allow[1],
4781 exid->spo_must_allow[2]);
4782 }
4783
4784 static __be32
4785 nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4786 {
4787 __be32 status;
4788
4789 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT)
4790 return nfserr_resource;
4791 switch (exid->spa_how) {
4792 case SP4_NONE:
4793 status = nfs_ok;
4794 break;
4795 case SP4_MACH_CRED:
4796 /* spr_mach_ops */
4797 status = nfsd4_encode_state_protect_ops4(xdr, exid);
4798 break;
4799 default:
4800 status = nfserr_serverfault;
4801 }
4802 return status;
4803 }
4804
4805 static __be32
4806 nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4807 {
4808 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4809 __be32 status;
4810
4811 /* so_minor_id */
4812 status = nfsd4_encode_uint64_t(xdr, 0);
4813 if (status != nfs_ok)
4814 return status;
4815 /* so_major_id */
4816 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name));
4817 }
4818
4819 static __be32
4820 nfsd4_encode_nfs_impl_id4(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4821 {
4822 __be32 status;
4823
4824 /* nii_domain */
4825 status = nfsd4_encode_opaque(xdr, exid->nii_domain.data,
4826 exid->nii_domain.len);
4827 if (status != nfs_ok)
4828 return status;
4829 /* nii_name */
4830 status = nfsd4_encode_opaque(xdr, exid->nii_name.data,
4831 exid->nii_name.len);
4832 if (status != nfs_ok)
4833 return status;
4834 /* nii_time */
4835 return nfsd4_encode_nfstime4(xdr, &exid->nii_time);
4836 }
4837
4838 static __be32
4839 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4840 union nfsd4_op_u *u)
4841 {
4842 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4843 struct nfsd4_exchange_id *exid = &u->exchange_id;
4844 struct xdr_stream *xdr = resp->xdr;
4845
4846 /* eir_clientid */
4847 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid);
4848 if (nfserr != nfs_ok)
4849 return nfserr;
4850 /* eir_sequenceid */
4851 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4852 if (nfserr != nfs_ok)
4853 return nfserr;
4854 /* eir_flags */
4855 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags);
4856 if (nfserr != nfs_ok)
4857 return nfserr;
4858 /* eir_state_protect */
4859 nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4860 if (nfserr != nfs_ok)
4861 return nfserr;
4862 /* eir_server_owner */
4863 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp);
4864 if (nfserr != nfs_ok)
4865 return nfserr;
4866 /* eir_server_scope */
4867 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name,
4868 strlen(nn->nfsd_name));
4869 if (nfserr != nfs_ok)
4870 return nfserr;
4871 /* eir_server_impl_id<1> */
4872 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
4873 return nfserr_resource;
4874 nfserr = nfsd4_encode_nfs_impl_id4(xdr, exid);
4875 if (nfserr != nfs_ok)
4876 return nfserr;
4877
4878 return nfs_ok;
4879 }
4880
4881 static __be32
4882 nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4883 const struct nfsd4_channel_attrs *attrs)
4884 {
4885 __be32 status;
4886
4887 /* ca_headerpadsize */
4888 status = nfsd4_encode_count4(xdr, 0);
4889 if (status != nfs_ok)
4890 return status;
4891 /* ca_maxrequestsize */
4892 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4893 if (status != nfs_ok)
4894 return status;
4895 /* ca_maxresponsesize */
4896 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4897 if (status != nfs_ok)
4898 return status;
4899 /* ca_maxresponsesize_cached */
4900 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4901 if (status != nfs_ok)
4902 return status;
4903 /* ca_maxoperations */
4904 status = nfsd4_encode_count4(xdr, attrs->maxops);
4905 if (status != nfs_ok)
4906 return status;
4907 /* ca_maxrequests */
4908 status = nfsd4_encode_count4(xdr, attrs->maxreqs);
4909 if (status != nfs_ok)
4910 return status;
4911 /* ca_rdma_ird<1> */
4912 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT)
4913 return nfserr_resource;
4914 if (attrs->nr_rdma_attrs)
4915 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs);
4916 return nfs_ok;
4917 }
4918
4919 static __be32
4920 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4921 union nfsd4_op_u *u)
4922 {
4923 struct nfsd4_create_session *sess = &u->create_session;
4924 struct xdr_stream *xdr = resp->xdr;
4925
4926 /* csr_sessionid */
4927 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid);
4928 if (nfserr != nfs_ok)
4929 return nfserr;
4930 /* csr_sequence */
4931 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
4932 if (nfserr != nfs_ok)
4933 return nfserr;
4934 /* csr_flags */
4935 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags);
4936 if (nfserr != nfs_ok)
4937 return nfserr;
4938 /* csr_fore_chan_attrs */
4939 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel);
4940 if (nfserr != nfs_ok)
4941 return nfserr;
4942 /* csr_back_chan_attrs */
4943 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel);
4944 }
4945
4946 static __be32
4947 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4948 union nfsd4_op_u *u)
4949 {
4950 struct nfsd4_sequence *seq = &u->sequence;
4951 struct xdr_stream *xdr = resp->xdr;
4952
4953 /* sr_sessionid */
4954 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid);
4955 if (nfserr != nfs_ok)
4956 return nfserr;
4957 /* sr_sequenceid */
4958 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
4959 if (nfserr != nfs_ok)
4960 return nfserr;
4961 /* sr_slotid */
4962 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
4963 if (nfserr != nfs_ok)
4964 return nfserr;
4965 /* Note slotid's are numbered from zero: */
4966 /* sr_highest_slotid */
4967 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4968 if (nfserr != nfs_ok)
4969 return nfserr;
4970 /* sr_target_highest_slotid */
4971 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
4972 if (nfserr != nfs_ok)
4973 return nfserr;
4974 /* sr_status_flags */
4975 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags);
4976 if (nfserr != nfs_ok)
4977 return nfserr;
4978
4979 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4980 return nfs_ok;
4981 }
4982
4983 static __be32
4984 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4985 union nfsd4_op_u *u)
4986 {
4987 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4988 struct nfsd4_test_stateid_id *stateid, *next;
4989 struct xdr_stream *xdr = resp->xdr;
4990
4991 /* tsr_status_codes<> */
4992 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT)
4993 return nfserr_resource;
4994 list_for_each_entry_safe(stateid, next,
4995 &test_stateid->ts_stateid_list, ts_id_list) {
4996 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT)
4997 return nfserr_resource;
4998 }
4999 return nfs_ok;
5000 }
5001
5002 static __be32
5003 nfsd4_encode_get_dir_delegation(struct nfsd4_compoundres *resp, __be32 nfserr,
5004 union nfsd4_op_u *u)
5005 {
5006 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
5007 struct xdr_stream *xdr = resp->xdr;
5008 __be32 status = nfserr_resource;
5009
5010 switch(gdd->gddrnf_status) {
5011 case GDD4_OK:
5012 if (xdr_stream_encode_u32(xdr, GDD4_OK) != XDR_UNIT)
5013 break;
5014 status = nfsd4_encode_verifier4(xdr, &gdd->gddr_cookieverf);
5015 if (status)
5016 break;
5017 status = nfsd4_encode_stateid4(xdr, &gdd->gddr_stateid);
5018 if (status)
5019 break;
5020 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_notification[0], 0, 0);
5021 if (status)
5022 break;
5023 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_child_attributes[0],
5024 gdd->gddr_child_attributes[1],
5025 gdd->gddr_child_attributes[2]);
5026 if (status)
5027 break;
5028 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_dir_attributes[0],
5029 gdd->gddr_dir_attributes[1],
5030 gdd->gddr_dir_attributes[2]);
5031 break;
5032 default:
5033 pr_warn("nfsd: bad gddrnf_status (%u)\n", gdd->gddrnf_status);
5034 gdd->gddrnf_will_signal_deleg_avail = 0;
5035 fallthrough;
5036 case GDD4_UNAVAIL:
5037 if (xdr_stream_encode_u32(xdr, GDD4_UNAVAIL) != XDR_UNIT)
5038 break;
5039 status = nfsd4_encode_bool(xdr, gdd->gddrnf_will_signal_deleg_avail);
5040 break;
5041 }
5042 return status;
5043 }
5044
5045 #ifdef CONFIG_NFSD_PNFS
5046 static __be32
5047 nfsd4_encode_device_addr4(struct xdr_stream *xdr,
5048 const struct nfsd4_getdeviceinfo *gdev)
5049 {
5050 u32 needed_len, starting_len = xdr->buf->len;
5051 const struct nfsd4_layout_ops *ops;
5052 __be32 status;
5053
5054 /* da_layout_type */
5055 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT)
5056 return nfserr_resource;
5057 /* da_addr_body */
5058 ops = nfsd4_layout_ops[gdev->gd_layout_type];
5059 status = ops->encode_getdeviceinfo(xdr, gdev);
5060 if (status != nfs_ok) {
5061 /*
5062 * Don't burden the layout drivers with enforcing
5063 * gd_maxcount. Just tell the client to come back
5064 * with a bigger buffer if it's not enough.
5065 */
5066 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
5067 goto toosmall;
5068 return status;
5069 }
5070
5071 return nfs_ok;
5072
5073 toosmall:
5074 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
5075 xdr_truncate_encode(xdr, starting_len);
5076
5077 status = nfsd4_encode_count4(xdr, needed_len);
5078 if (status != nfs_ok)
5079 return status;
5080 return nfserr_toosmall;
5081 }
5082
5083 static __be32
5084 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5085 union nfsd4_op_u *u)
5086 {
5087 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5088 struct xdr_stream *xdr = resp->xdr;
5089
5090 /* gdir_device_addr */
5091 nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5092 if (nfserr)
5093 return nfserr;
5094 /* gdir_notification */
5095 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0);
5096 }
5097
5098 static __be32
5099 nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5100 {
5101 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5102 __be32 status;
5103
5104 /* lo_offset */
5105 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5106 if (status != nfs_ok)
5107 return status;
5108 /* lo_length */
5109 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5110 if (status != nfs_ok)
5111 return status;
5112 /* lo_iomode */
5113 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT)
5114 return nfserr_resource;
5115 /* lo_content */
5116 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT)
5117 return nfserr_resource;
5118 return ops->encode_layoutget(xdr, lgp);
5119 }
5120
5121 static __be32
5122 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5123 union nfsd4_op_u *u)
5124 {
5125 struct nfsd4_layoutget *lgp = &u->layoutget;
5126 struct xdr_stream *xdr = resp->xdr;
5127
5128 /* logr_return_on_close */
5129 nfserr = nfsd4_encode_bool(xdr, true);
5130 if (nfserr != nfs_ok)
5131 return nfserr;
5132 /* logr_stateid */
5133 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid);
5134 if (nfserr != nfs_ok)
5135 return nfserr;
5136 /* logr_layout<> */
5137 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5138 return nfserr_resource;
5139 return nfsd4_encode_layout4(xdr, lgp);
5140 }
5141
5142 static __be32
5143 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5144 union nfsd4_op_u *u)
5145 {
5146 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5147 struct xdr_stream *xdr = resp->xdr;
5148
5149 /* ns_sizechanged */
5150 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg);
5151 if (nfserr != nfs_ok)
5152 return nfserr;
5153 if (lcp->lc_size_chg)
5154 /* ns_size */
5155 return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5156 return nfs_ok;
5157 }
5158
5159 static __be32
5160 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5161 union nfsd4_op_u *u)
5162 {
5163 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5164 struct xdr_stream *xdr = resp->xdr;
5165
5166 /* lrs_present */
5167 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present);
5168 if (nfserr != nfs_ok)
5169 return nfserr;
5170 if (lrp->lrs_present)
5171 /* lrs_stateid */
5172 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid);
5173 return nfs_ok;
5174 }
5175 #endif /* CONFIG_NFSD_PNFS */
5176
5177 static __be32
5178 nfsd4_encode_write_response4(struct xdr_stream *xdr,
5179 const struct nfsd4_copy *copy)
5180 {
5181 const struct nfsd42_write_res *write = &copy->cp_res;
5182 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5183 __be32 status;
5184
5185 /* wr_callback_id<1> */
5186 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT)
5187 return nfserr_resource;
5188 if (count) {
5189 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid);
5190 if (status != nfs_ok)
5191 return status;
5192 }
5193
5194 /* wr_count */
5195 status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5196 if (status != nfs_ok)
5197 return status;
5198 /* wr_committed */
5199 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT)
5200 return nfserr_resource;
5201 /* wr_writeverf */
5202 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
5203 }
5204
5205 static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5206 const struct nfsd4_copy *copy)
5207 {
5208 __be32 status;
5209
5210 /* cr_consecutive */
5211 status = nfsd4_encode_bool(xdr, true);
5212 if (status != nfs_ok)
5213 return status;
5214 /* cr_synchronous */
5215 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy));
5216 }
5217
5218 static __be32
5219 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5220 union nfsd4_op_u *u)
5221 {
5222 struct nfsd4_copy *copy = &u->copy;
5223
5224 nfserr = nfsd4_encode_write_response4(resp->xdr, copy);
5225 if (nfserr != nfs_ok)
5226 return nfserr;
5227 return nfsd4_encode_copy_requirements4(resp->xdr, copy);
5228 }
5229
5230 static __be32
5231 nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5232 {
5233 __be32 status;
5234
5235 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT)
5236 return nfserr_resource;
5237 switch (ns->nl4_type) {
5238 case NL4_NETADDR:
5239 /* nl_addr */
5240 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr);
5241 break;
5242 default:
5243 status = nfserr_serverfault;
5244 }
5245 return status;
5246 }
5247
5248 static __be32
5249 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5250 union nfsd4_op_u *u)
5251 {
5252 struct nfsd4_copy_notify *cn = &u->copy_notify;
5253 struct xdr_stream *xdr = resp->xdr;
5254
5255 /* cnr_lease_time */
5256 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time);
5257 if (nfserr)
5258 return nfserr;
5259 /* cnr_stateid */
5260 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid);
5261 if (nfserr)
5262 return nfserr;
5263 /* cnr_source_server<> */
5264 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5265 return nfserr_resource;
5266 return nfsd4_encode_netloc4(xdr, cn->cpn_src);
5267 }
5268
5269 static __be32
5270 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5271 union nfsd4_op_u *u)
5272 {
5273 struct nfsd4_offload_status *os = &u->offload_status;
5274 struct xdr_stream *xdr = resp->xdr;
5275
5276 /* osr_count */
5277 nfserr = nfsd4_encode_length4(xdr, os->count);
5278 if (nfserr != nfs_ok)
5279 return nfserr;
5280 /* osr_complete<1> */
5281 if (os->completed) {
5282 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5283 return nfserr_resource;
5284 if (xdr_stream_encode_be32(xdr, os->status) != XDR_UNIT)
5285 return nfserr_resource;
5286 } else if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
5287 return nfserr_resource;
5288 return nfs_ok;
5289 }
5290
5291 static __be32
5292 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5293 struct nfsd4_read *read)
5294 {
5295 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
5296 struct file *file = read->rd_nf->nf_file;
5297 struct xdr_stream *xdr = resp->xdr;
5298 bool splice_ok = argp->splice_ok;
5299 unsigned long maxcount;
5300 __be32 nfserr, *p;
5301
5302 /* Content type, offset, byte count */
5303 p = xdr_reserve_space(xdr, 4 + 8 + 4);
5304 if (!p)
5305 return nfserr_io;
5306 if (resp->xdr->buf->page_len && splice_ok) {
5307 WARN_ON_ONCE(splice_ok);
5308 return nfserr_serverfault;
5309 }
5310
5311 maxcount = min_t(unsigned long, read->rd_length,
5312 (xdr->buf->buflen - xdr->buf->len));
5313
5314 if (file->f_op->splice_read && splice_ok)
5315 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5316 else
5317 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5318 if (nfserr)
5319 return nfserr;
5320
5321 *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
5322 p = xdr_encode_hyper(p, read->rd_offset);
5323 *p = cpu_to_be32(read->rd_length);
5324
5325 return nfs_ok;
5326 }
5327
5328 static __be32
5329 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5330 union nfsd4_op_u *u)
5331 {
5332 struct nfsd4_read *read = &u->read;
5333 struct file *file = read->rd_nf->nf_file;
5334 struct xdr_stream *xdr = resp->xdr;
5335 int starting_len = xdr->buf->len;
5336 u32 segments = 0;
5337 __be32 *p;
5338
5339 if (nfserr)
5340 return nfserr;
5341
5342 /* eof flag, segment count */
5343 p = xdr_reserve_space(xdr, 4 + 4);
5344 if (!p)
5345 return nfserr_io;
5346 xdr_commit_encode(xdr);
5347
5348 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
5349 if (read->rd_eof)
5350 goto out;
5351
5352 nfserr = nfsd4_encode_read_plus_data(resp, read);
5353 if (nfserr) {
5354 xdr_truncate_encode(xdr, starting_len);
5355 return nfserr;
5356 }
5357
5358 segments++;
5359
5360 out:
5361 p = xdr_encode_bool(p, read->rd_eof);
5362 *p = cpu_to_be32(segments);
5363 return nfserr;
5364 }
5365
5366 static __be32
5367 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5368 union nfsd4_op_u *u)
5369 {
5370 struct nfsd4_seek *seek = &u->seek;
5371 struct xdr_stream *xdr = resp->xdr;
5372
5373 /* sr_eof */
5374 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof);
5375 if (nfserr != nfs_ok)
5376 return nfserr;
5377 /* sr_offset */
5378 return nfsd4_encode_offset4(xdr, seek->seek_pos);
5379 }
5380
5381 static __be32
5382 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5383 union nfsd4_op_u *p)
5384 {
5385 return nfserr;
5386 }
5387
5388 /*
5389 * Encode kmalloc-ed buffer in to XDR stream.
5390 */
5391 static __be32
5392 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5393 {
5394 u32 cplen;
5395 __be32 *p;
5396
5397 cplen = min_t(unsigned long, buflen,
5398 ((void *)xdr->end - (void *)xdr->p));
5399 p = xdr_reserve_space(xdr, cplen);
5400 if (!p)
5401 return nfserr_resource;
5402
5403 memcpy(p, buf, cplen);
5404 buf += cplen;
5405 buflen -= cplen;
5406
5407 while (buflen) {
5408 cplen = min_t(u32, buflen, PAGE_SIZE);
5409 p = xdr_reserve_space(xdr, cplen);
5410 if (!p)
5411 return nfserr_resource;
5412
5413 memcpy(p, buf, cplen);
5414
5415 if (cplen < PAGE_SIZE) {
5416 /*
5417 * We're done, with a length that wasn't page
5418 * aligned, so possibly not word aligned. Pad
5419 * any trailing bytes with 0.
5420 */
5421 xdr_encode_opaque_fixed(p, NULL, cplen);
5422 break;
5423 }
5424
5425 buflen -= PAGE_SIZE;
5426 buf += PAGE_SIZE;
5427 }
5428
5429 return 0;
5430 }
5431
5432 static __be32
5433 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5434 union nfsd4_op_u *u)
5435 {
5436 struct nfsd4_getxattr *getxattr = &u->getxattr;
5437 struct xdr_stream *xdr = resp->xdr;
5438 __be32 *p, err;
5439
5440 p = xdr_reserve_space(xdr, 4);
5441 if (!p)
5442 return nfserr_resource;
5443
5444 *p = cpu_to_be32(getxattr->getxa_len);
5445
5446 if (getxattr->getxa_len == 0)
5447 return 0;
5448
5449 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5450 getxattr->getxa_len);
5451
5452 kvfree(getxattr->getxa_buf);
5453
5454 return err;
5455 }
5456
5457 static __be32
5458 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5459 union nfsd4_op_u *u)
5460 {
5461 struct nfsd4_setxattr *setxattr = &u->setxattr;
5462 struct xdr_stream *xdr = resp->xdr;
5463
5464 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo);
5465 }
5466
5467 /*
5468 * See if there are cookie values that can be rejected outright.
5469 */
5470 static __be32
5471 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5472 u32 *offsetp)
5473 {
5474 u64 cookie = listxattrs->lsxa_cookie;
5475
5476 /*
5477 * If the cookie is larger than the maximum number we can fit
5478 * in the buffer we just got back from vfs_listxattr, it's invalid.
5479 */
5480 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5481 return nfserr_badcookie;
5482
5483 *offsetp = (u32)cookie;
5484 return 0;
5485 }
5486
5487 static __be32
5488 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5489 union nfsd4_op_u *u)
5490 {
5491 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5492 struct xdr_stream *xdr = resp->xdr;
5493 u32 cookie_offset, count_offset, eof;
5494 u32 left, xdrleft, slen, count;
5495 u32 xdrlen, offset;
5496 u64 cookie;
5497 char *sp;
5498 __be32 status, tmp;
5499 __be64 wire_cookie;
5500 __be32 *p;
5501 u32 nuser;
5502
5503 eof = 1;
5504
5505 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5506 if (status)
5507 goto out;
5508
5509 /*
5510 * Reserve space for the cookie and the name array count. Record
5511 * the offsets to save them later.
5512 */
5513 cookie_offset = xdr->buf->len;
5514 count_offset = cookie_offset + 8;
5515 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
5516 if (!p) {
5517 status = nfserr_resource;
5518 goto out;
5519 }
5520
5521 count = 0;
5522 left = listxattrs->lsxa_len;
5523 sp = listxattrs->lsxa_buf;
5524 nuser = 0;
5525
5526 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */
5527 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3;
5528
5529 while (left > 0 && xdrleft > 0) {
5530 slen = strlen(sp);
5531
5532 /*
5533 * Check if this is a "user." attribute, skip it if not.
5534 */
5535 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5536 goto contloop;
5537
5538 slen -= XATTR_USER_PREFIX_LEN;
5539 xdrlen = 4 + ((slen + 3) & ~3);
5540 /* Check if both entry and eof can fit in the XDR buffer */
5541 if (xdrlen + XDR_UNIT > xdrleft) {
5542 if (count == 0) {
5543 /*
5544 * Can't even fit the first attribute name.
5545 */
5546 status = nfserr_toosmall;
5547 goto out;
5548 }
5549 eof = 0;
5550 goto wreof;
5551 }
5552
5553 left -= XATTR_USER_PREFIX_LEN;
5554 sp += XATTR_USER_PREFIX_LEN;
5555 if (nuser++ < offset)
5556 goto contloop;
5557
5558
5559 p = xdr_reserve_space(xdr, xdrlen);
5560 if (!p) {
5561 status = nfserr_resource;
5562 goto out;
5563 }
5564
5565 xdr_encode_opaque(p, sp, slen);
5566
5567 xdrleft -= xdrlen;
5568 count++;
5569 contloop:
5570 sp += slen + 1;
5571 left -= slen + 1;
5572 }
5573
5574 /*
5575 * If there were user attributes to copy, but we didn't copy
5576 * any, the offset was too large (e.g. the cookie was invalid).
5577 */
5578 if (nuser > 0 && count == 0) {
5579 status = nfserr_badcookie;
5580 goto out;
5581 }
5582
5583 wreof:
5584 p = xdr_reserve_space(xdr, 4);
5585 if (!p) {
5586 status = nfserr_resource;
5587 goto out;
5588 }
5589 *p = cpu_to_be32(eof);
5590
5591 cookie = offset + count;
5592
5593 wire_cookie = cpu_to_be64(cookie);
5594 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8);
5595 tmp = cpu_to_be32(count);
5596 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5597 out:
5598 if (listxattrs->lsxa_len)
5599 kvfree(listxattrs->lsxa_buf);
5600 return status;
5601 }
5602
5603 static __be32
5604 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5605 union nfsd4_op_u *u)
5606 {
5607 struct nfsd4_removexattr *removexattr = &u->removexattr;
5608 struct xdr_stream *xdr = resp->xdr;
5609
5610 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo);
5611 }
5612
5613 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5614
5615 /*
5616 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5617 * since we don't need to filter out obsolete ops as this is
5618 * done in the decoding phase.
5619 */
5620 static const nfsd4_enc nfsd4_enc_ops[] = {
5621 [OP_ACCESS] = nfsd4_encode_access,
5622 [OP_CLOSE] = nfsd4_encode_close,
5623 [OP_COMMIT] = nfsd4_encode_commit,
5624 [OP_CREATE] = nfsd4_encode_create,
5625 [OP_DELEGPURGE] = nfsd4_encode_noop,
5626 [OP_DELEGRETURN] = nfsd4_encode_noop,
5627 [OP_GETATTR] = nfsd4_encode_getattr,
5628 [OP_GETFH] = nfsd4_encode_getfh,
5629 [OP_LINK] = nfsd4_encode_link,
5630 [OP_LOCK] = nfsd4_encode_lock,
5631 [OP_LOCKT] = nfsd4_encode_lockt,
5632 [OP_LOCKU] = nfsd4_encode_locku,
5633 [OP_LOOKUP] = nfsd4_encode_noop,
5634 [OP_LOOKUPP] = nfsd4_encode_noop,
5635 [OP_NVERIFY] = nfsd4_encode_noop,
5636 [OP_OPEN] = nfsd4_encode_open,
5637 [OP_OPENATTR] = nfsd4_encode_noop,
5638 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5639 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5640 [OP_PUTFH] = nfsd4_encode_noop,
5641 [OP_PUTPUBFH] = nfsd4_encode_noop,
5642 [OP_PUTROOTFH] = nfsd4_encode_noop,
5643 [OP_READ] = nfsd4_encode_read,
5644 [OP_READDIR] = nfsd4_encode_readdir,
5645 [OP_READLINK] = nfsd4_encode_readlink,
5646 [OP_REMOVE] = nfsd4_encode_remove,
5647 [OP_RENAME] = nfsd4_encode_rename,
5648 [OP_RENEW] = nfsd4_encode_noop,
5649 [OP_RESTOREFH] = nfsd4_encode_noop,
5650 [OP_SAVEFH] = nfsd4_encode_noop,
5651 [OP_SECINFO] = nfsd4_encode_secinfo,
5652 [OP_SETATTR] = nfsd4_encode_setattr,
5653 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5654 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5655 [OP_VERIFY] = nfsd4_encode_noop,
5656 [OP_WRITE] = nfsd4_encode_write,
5657 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5658
5659 /* NFSv4.1 operations */
5660 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5661 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5662 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5663 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5664 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5665 [OP_FREE_STATEID] = nfsd4_encode_noop,
5666 [OP_GET_DIR_DELEGATION] = nfsd4_encode_get_dir_delegation,
5667 #ifdef CONFIG_NFSD_PNFS
5668 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5669 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5670 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5671 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5672 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5673 #else
5674 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5675 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5676 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5677 [OP_LAYOUTGET] = nfsd4_encode_noop,
5678 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
5679 #endif
5680 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5681 [OP_SEQUENCE] = nfsd4_encode_sequence,
5682 [OP_SET_SSV] = nfsd4_encode_noop,
5683 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5684 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5685 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5686 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5687
5688 /* NFSv4.2 operations */
5689 [OP_ALLOCATE] = nfsd4_encode_noop,
5690 [OP_COPY] = nfsd4_encode_copy,
5691 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5692 [OP_DEALLOCATE] = nfsd4_encode_noop,
5693 [OP_IO_ADVISE] = nfsd4_encode_noop,
5694 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5695 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5696 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5697 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5698 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5699 [OP_SEEK] = nfsd4_encode_seek,
5700 [OP_WRITE_SAME] = nfsd4_encode_noop,
5701 [OP_CLONE] = nfsd4_encode_noop,
5702
5703 /* RFC 8276 extended atributes operations */
5704 [OP_GETXATTR] = nfsd4_encode_getxattr,
5705 [OP_SETXATTR] = nfsd4_encode_setxattr,
5706 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5707 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5708 };
5709
5710 /*
5711 * Calculate whether we still have space to encode repsize bytes.
5712 * There are two considerations:
5713 * - For NFS versions >=4.1, the size of the reply must stay within
5714 * session limits
5715 * - For all NFS versions, we must stay within limited preallocated
5716 * buffer space.
5717 *
5718 * This is called before the operation is processed, so can only provide
5719 * an upper estimate. For some nonidempotent operations (such as
5720 * getattr), it's not necessarily a problem if that estimate is wrong,
5721 * as we can fail it after processing without significant side effects.
5722 */
5723 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5724 {
5725 struct xdr_buf *buf = &resp->rqstp->rq_res;
5726 struct nfsd4_slot *slot = resp->cstate.slot;
5727
5728 if (buf->len + respsize <= buf->buflen)
5729 return nfs_ok;
5730 if (!nfsd4_has_session(&resp->cstate))
5731 return nfserr_resource;
5732 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5733 WARN_ON_ONCE(1);
5734 return nfserr_rep_too_big_to_cache;
5735 }
5736 return nfserr_rep_too_big;
5737 }
5738
5739 static __be32 nfsd4_map_status(__be32 status, u32 minor)
5740 {
5741 switch (status) {
5742 case nfs_ok:
5743 break;
5744 case nfserr_wrong_type:
5745 /* RFC 8881 - 15.1.2.9 */
5746 if (minor == 0)
5747 status = nfserr_inval;
5748 break;
5749 case nfserr_symlink_not_dir:
5750 status = nfserr_symlink;
5751 break;
5752 }
5753 return status;
5754 }
5755
5756 void
5757 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5758 {
5759 struct xdr_stream *xdr = resp->xdr;
5760 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5761 struct svc_rqst *rqstp = resp->rqstp;
5762 const struct nfsd4_operation *opdesc = op->opdesc;
5763 int post_err_offset;
5764 nfsd4_enc encoder;
5765 __be32 *p;
5766
5767 p = xdr_reserve_space(xdr, 8);
5768 if (!p)
5769 goto release;
5770 *p++ = cpu_to_be32(op->opnum);
5771 post_err_offset = xdr->buf->len;
5772
5773 if (op->opnum == OP_ILLEGAL)
5774 goto status;
5775 if (op->status && opdesc &&
5776 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5777 goto status;
5778 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5779 !nfsd4_enc_ops[op->opnum]);
5780 encoder = nfsd4_enc_ops[op->opnum];
5781 op->status = encoder(resp, op->status, &op->u);
5782 if (op->status)
5783 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5784 xdr_commit_encode(xdr);
5785
5786 /* nfsd4_check_resp_size guarantees enough room for error status */
5787 if (!op->status) {
5788 int space_needed = 0;
5789 if (!nfsd4_last_compound_op(rqstp))
5790 space_needed = COMPOUND_ERR_SLACK_SPACE;
5791 op->status = nfsd4_check_resp_size(resp, space_needed);
5792 }
5793 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5794 struct nfsd4_slot *slot = resp->cstate.slot;
5795
5796 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5797 op->status = nfserr_rep_too_big_to_cache;
5798 else
5799 op->status = nfserr_rep_too_big;
5800 }
5801 if (op->status == nfserr_resource ||
5802 op->status == nfserr_rep_too_big ||
5803 op->status == nfserr_rep_too_big_to_cache) {
5804 /*
5805 * The operation may have already been encoded or
5806 * partially encoded. No op returns anything additional
5807 * in the case of one of these three errors, so we can
5808 * just truncate back to after the status. But it's a
5809 * bug if we had to do this on a non-idempotent op:
5810 */
5811 warn_on_nonidempotent_op(op);
5812 xdr_truncate_encode(xdr, post_err_offset);
5813 }
5814 if (so) {
5815 int len = xdr->buf->len - post_err_offset;
5816
5817 so->so_replay.rp_status = op->status;
5818 so->so_replay.rp_buflen = len;
5819 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5820 so->so_replay.rp_buf, len);
5821 }
5822 status:
5823 op->status = nfsd4_map_status(op->status,
5824 resp->cstate.minorversion);
5825 *p = op->status;
5826 release:
5827 if (opdesc && opdesc->op_release)
5828 opdesc->op_release(&op->u);
5829
5830 /*
5831 * Account for pages consumed while encoding this operation.
5832 * The xdr_stream primitives don't manage rq_next_page.
5833 */
5834 rqstp->rq_next_page = xdr->page_ptr + 1;
5835 }
5836
5837 /**
5838 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache
5839 * @xdr: send buffer's XDR stream
5840 * @op: operation being replayed
5841 *
5842 * @op->replay->rp_buf contains the previously-sent already-encoded result.
5843 */
5844 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5845 {
5846 struct nfs4_replay *rp = op->replay;
5847
5848 trace_nfsd_stateowner_replay(op->opnum, rp);
5849
5850 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT)
5851 return;
5852 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT)
5853 return;
5854 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen);
5855 }
5856
5857 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5858 {
5859 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5860
5861 if (args->ops != args->iops) {
5862 vfree(args->ops);
5863 args->ops = args->iops;
5864 }
5865 while (args->to_free) {
5866 struct svcxdr_tmpbuf *tb = args->to_free;
5867 args->to_free = tb->next;
5868 kfree(tb);
5869 }
5870 }
5871
5872 bool
5873 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5874 {
5875 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5876
5877 /* svcxdr_tmp_alloc */
5878 args->to_free = NULL;
5879
5880 args->xdr = xdr;
5881 args->ops = args->iops;
5882 args->rqstp = rqstp;
5883
5884 return nfsd4_decode_compound(args);
5885 }
5886
5887 bool
5888 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5889 {
5890 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5891 __be32 *p;
5892
5893 /*
5894 * Send buffer space for the following items is reserved
5895 * at the top of nfsd4_proc_compound().
5896 */
5897 p = resp->statusp;
5898
5899 *p++ = resp->cstate.status;
5900 *p++ = htonl(resp->taglen);
5901 memcpy(p, resp->tag, resp->taglen);
5902 p += XDR_QUADLEN(resp->taglen);
5903 *p++ = htonl(resp->opcnt);
5904
5905 nfsd4_sequence_done(resp);
5906 return true;
5907 }
Kernel DRM miscellaneous fixes and cross-tree changes