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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
68const 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
90static __be32
91check_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
107static 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 */
120static void *
121svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
122{
123 struct svcxdr_tmpbuf *tb;
124
125 tb = kmalloc(sizeof(*tb) + 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 */
140static char *
141svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
142{
143 char *p = svcxdr_tmpalloc(argp, len + 1);
144
145 if (!p)
146 return NULL;
147 memcpy(p, buf, len);
148 p[len] = '\0';
149 return p;
150}
151
152static void *
153svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, u32 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 */
179static __be32
180nfsd4_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
194static __be32
195nfsd4_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
215static __be32
216nfsd4_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
235static __be32
236nfsd4_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
250static __be32
251nfsd4_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 */
279static __be32
280nfsd4_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
288static __be32
289nfsd4_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 */
320static noinline __be32
321nfsd4_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
352static noinline __be32
353nfsd4_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
379static __be32
380nfsd4_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
531static __be32
532nfsd4_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
544static __be32
545nfsd4_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
556static __be32
557nfsd4_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
569static __be32
570nfsd4_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
582static __be32
583nfsd4_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
604static __be32
605nfsd4_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
643static __be32
644nfsd4_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 */
657static __be32
658nfsd4_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
698static __be32
699nfsd4_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 */
724static __be32
725nfsd4_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
771static __be32
772nfsd4_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
781static __be32
782nfsd4_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
791static __be32
792nfsd4_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
803static __be32
804nfsd4_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
850static inline __be32
851nfsd4_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
857static inline __be32
858nfsd4_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
866static __be32
867nfsd4_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
874static __be32
875nfsd4_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
891static __be32
892nfsd4_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
906static __be32
907nfsd4_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
916static __be32
917nfsd4_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
934static __be32
935nfsd4_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
951static __be32
952nfsd4_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
974static __be32
975nfsd4_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
981static __be32
982nfsd4_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
1023static __be32
1024nfsd4_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
1045static __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
1096static __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
1107static __be32
1108nfsd4_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
1156static __be32
1157nfsd4_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
1185static __be32
1186nfsd4_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
1206static __be32
1207nfsd4_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
1227static __be32
1228nfsd4_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
1248static __be32
1249nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
1250{
1251 if (argp->minorversion == 0)
1252 return nfs_ok;
1253 return nfserr_notsupp;
1254}
1255
1256static __be32
1257nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1258{
1259 struct nfsd4_read *read = &u->read;
1260 __be32 status;
1261
1262 memset(read, 0, sizeof(*read));
1263 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1264 if (status)
1265 return status;
1266 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1267 return nfserr_bad_xdr;
1268 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1269 return nfserr_bad_xdr;
1270
1271 return nfs_ok;
1272}
1273
1274static __be32
1275nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1276{
1277 struct nfsd4_readdir *readdir = &u->readdir;
1278 __be32 status;
1279
1280 memset(readdir, 0, sizeof(*readdir));
1281 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1282 return nfserr_bad_xdr;
1283 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1284 if (status)
1285 return status;
1286 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1287 return nfserr_bad_xdr;
1288 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1289 return nfserr_bad_xdr;
1290 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1291 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1292 return nfserr_bad_xdr;
1293
1294 return nfs_ok;
1295}
1296
1297static __be32
1298nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1299{
1300 struct nfsd4_remove *remove = &u->remove;
1301 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1302 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1303}
1304
1305static __be32
1306nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1307{
1308 struct nfsd4_rename *rename = &u->rename;
1309 __be32 status;
1310
1311 memset(rename, 0, sizeof(*rename));
1312 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1313 if (status)
1314 return status;
1315 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1316}
1317
1318static __be32
1319nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320{
1321 clientid_t *clientid = &u->renew;
1322 return nfsd4_decode_clientid4(argp, clientid);
1323}
1324
1325static __be32
1326nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1327 union nfsd4_op_u *u)
1328{
1329 struct nfsd4_secinfo *secinfo = &u->secinfo;
1330 secinfo->si_exp = NULL;
1331 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1332}
1333
1334static __be32
1335nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1336{
1337 struct nfsd4_setattr *setattr = &u->setattr;
1338 __be32 status;
1339
1340 memset(setattr, 0, sizeof(*setattr));
1341 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1342 if (status)
1343 return status;
1344 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1345 ARRAY_SIZE(setattr->sa_bmval),
1346 &setattr->sa_iattr, &setattr->sa_acl,
1347 &setattr->sa_label, NULL);
1348}
1349
1350static __be32
1351nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1352{
1353 struct nfsd4_setclientid *setclientid = &u->setclientid;
1354 __be32 *p, status;
1355
1356 memset(setclientid, 0, sizeof(*setclientid));
1357
1358 if (argp->minorversion >= 1)
1359 return nfserr_notsupp;
1360
1361 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1362 if (status)
1363 return status;
1364 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1365 if (status)
1366 return status;
1367 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1368 return nfserr_bad_xdr;
1369 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1370 return nfserr_bad_xdr;
1371 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1372 if (!p)
1373 return nfserr_bad_xdr;
1374 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1375 setclientid->se_callback_netid_len);
1376 if (!setclientid->se_callback_netid_val)
1377 return nfserr_jukebox;
1378
1379 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1380 return nfserr_bad_xdr;
1381 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1382 if (!p)
1383 return nfserr_bad_xdr;
1384 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1385 setclientid->se_callback_addr_len);
1386 if (!setclientid->se_callback_addr_val)
1387 return nfserr_jukebox;
1388 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1389 return nfserr_bad_xdr;
1390
1391 return nfs_ok;
1392}
1393
1394static __be32
1395nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1396 union nfsd4_op_u *u)
1397{
1398 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1399 __be32 status;
1400
1401 if (argp->minorversion >= 1)
1402 return nfserr_notsupp;
1403
1404 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1405 if (status)
1406 return status;
1407 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1408}
1409
1410/* Also used for NVERIFY */
1411static __be32
1412nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1413{
1414 struct nfsd4_verify *verify = &u->verify;
1415 __be32 *p, status;
1416
1417 memset(verify, 0, sizeof(*verify));
1418
1419 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1420 ARRAY_SIZE(verify->ve_bmval));
1421 if (status)
1422 return status;
1423
1424 /* For convenience's sake, we compare raw xdr'd attributes in
1425 * nfsd4_proc_verify */
1426
1427 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1428 return nfserr_bad_xdr;
1429 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1430 if (!p)
1431 return nfserr_bad_xdr;
1432 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1433 if (!verify->ve_attrval)
1434 return nfserr_jukebox;
1435
1436 return nfs_ok;
1437}
1438
1439static __be32
1440nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1441{
1442 struct nfsd4_write *write = &u->write;
1443 __be32 status;
1444
1445 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1446 if (status)
1447 return status;
1448 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1449 return nfserr_bad_xdr;
1450 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1451 return nfserr_bad_xdr;
1452 if (write->wr_stable_how > NFS_FILE_SYNC)
1453 return nfserr_bad_xdr;
1454 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1455 return nfserr_bad_xdr;
1456 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1457 return nfserr_bad_xdr;
1458
1459 write->wr_bytes_written = 0;
1460 write->wr_how_written = 0;
1461 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1462 return nfs_ok;
1463}
1464
1465static __be32
1466nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1467 union nfsd4_op_u *u)
1468{
1469 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1470 __be32 status;
1471
1472 if (argp->minorversion >= 1)
1473 return nfserr_notsupp;
1474
1475 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1476 &rlockowner->rl_owner);
1477 if (status)
1478 return status;
1479
1480 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1481 return nfserr_inval;
1482
1483 return nfs_ok;
1484}
1485
1486static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1487 union nfsd4_op_u *u)
1488{
1489 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1490 memset(bc, 0, sizeof(*bc));
1491 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1492 return nfserr_bad_xdr;
1493 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1494}
1495
1496static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1497 union nfsd4_op_u *u)
1498{
1499 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1500 u32 use_conn_in_rdma_mode;
1501 __be32 status;
1502
1503 memset(bcts, 0, sizeof(*bcts));
1504 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1505 if (status)
1506 return status;
1507 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1508 return nfserr_bad_xdr;
1509 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1510 return nfserr_bad_xdr;
1511
1512 return nfs_ok;
1513}
1514
1515static __be32
1516nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1517 struct nfsd4_exchange_id *exid)
1518{
1519 __be32 status;
1520
1521 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1522 ARRAY_SIZE(exid->spo_must_enforce));
1523 if (status)
1524 return nfserr_bad_xdr;
1525 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1526 ARRAY_SIZE(exid->spo_must_allow));
1527 if (status)
1528 return nfserr_bad_xdr;
1529
1530 return nfs_ok;
1531}
1532
1533/*
1534 * This implementation currently does not support SP4_SSV.
1535 * This decoder simply skips over these arguments.
1536 */
1537static noinline __be32
1538nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1539 struct nfsd4_exchange_id *exid)
1540{
1541 u32 count, window, num_gss_handles;
1542 __be32 status;
1543
1544 /* ssp_ops */
1545 status = nfsd4_decode_state_protect_ops(argp, exid);
1546 if (status)
1547 return status;
1548
1549 /* ssp_hash_algs<> */
1550 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1551 return nfserr_bad_xdr;
1552 while (count--) {
1553 status = nfsd4_decode_ignored_string(argp, 0);
1554 if (status)
1555 return status;
1556 }
1557
1558 /* ssp_encr_algs<> */
1559 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1560 return nfserr_bad_xdr;
1561 while (count--) {
1562 status = nfsd4_decode_ignored_string(argp, 0);
1563 if (status)
1564 return status;
1565 }
1566
1567 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1568 return nfserr_bad_xdr;
1569 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1570 return nfserr_bad_xdr;
1571
1572 return nfs_ok;
1573}
1574
1575static __be32
1576nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1577 struct nfsd4_exchange_id *exid)
1578{
1579 __be32 status;
1580
1581 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1582 return nfserr_bad_xdr;
1583 switch (exid->spa_how) {
1584 case SP4_NONE:
1585 break;
1586 case SP4_MACH_CRED:
1587 status = nfsd4_decode_state_protect_ops(argp, exid);
1588 if (status)
1589 return status;
1590 break;
1591 case SP4_SSV:
1592 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1593 if (status)
1594 return status;
1595 break;
1596 default:
1597 return nfserr_bad_xdr;
1598 }
1599
1600 return nfs_ok;
1601}
1602
1603static __be32
1604nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1605 struct nfsd4_exchange_id *exid)
1606{
1607 __be32 status;
1608 u32 count;
1609
1610 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1611 return nfserr_bad_xdr;
1612 switch (count) {
1613 case 0:
1614 break;
1615 case 1:
1616 /* Note that RFC 8881 places no length limit on
1617 * nii_domain, but this implementation permits no
1618 * more than NFS4_OPAQUE_LIMIT bytes */
1619 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1620 if (status)
1621 return status;
1622 /* Note that RFC 8881 places no length limit on
1623 * nii_name, but this implementation permits no
1624 * more than NFS4_OPAQUE_LIMIT bytes */
1625 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1626 if (status)
1627 return status;
1628 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1629 if (status)
1630 return status;
1631 break;
1632 default:
1633 return nfserr_bad_xdr;
1634 }
1635
1636 return nfs_ok;
1637}
1638
1639static __be32
1640nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1641 union nfsd4_op_u *u)
1642{
1643 struct nfsd4_exchange_id *exid = &u->exchange_id;
1644 __be32 status;
1645
1646 memset(exid, 0, sizeof(*exid));
1647 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1648 if (status)
1649 return status;
1650 status = nfsd4_decode_opaque(argp, &exid->clname);
1651 if (status)
1652 return status;
1653 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1654 return nfserr_bad_xdr;
1655 status = nfsd4_decode_state_protect4_a(argp, exid);
1656 if (status)
1657 return status;
1658 return nfsd4_decode_nfs_impl_id4(argp, exid);
1659}
1660
1661static __be32
1662nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1663 struct nfsd4_channel_attrs *ca)
1664{
1665 __be32 *p;
1666
1667 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1668 if (!p)
1669 return nfserr_bad_xdr;
1670
1671 /* headerpadsz is ignored */
1672 p++;
1673 ca->maxreq_sz = be32_to_cpup(p++);
1674 ca->maxresp_sz = be32_to_cpup(p++);
1675 ca->maxresp_cached = be32_to_cpup(p++);
1676 ca->maxops = be32_to_cpup(p++);
1677 ca->maxreqs = be32_to_cpup(p++);
1678 ca->nr_rdma_attrs = be32_to_cpup(p);
1679 switch (ca->nr_rdma_attrs) {
1680 case 0:
1681 break;
1682 case 1:
1683 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1684 return nfserr_bad_xdr;
1685 break;
1686 default:
1687 return nfserr_bad_xdr;
1688 }
1689
1690 return nfs_ok;
1691}
1692
1693static __be32
1694nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1695 union nfsd4_op_u *u)
1696{
1697 struct nfsd4_create_session *sess = &u->create_session;
1698 __be32 status;
1699
1700 memset(sess, 0, sizeof(*sess));
1701 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1702 if (status)
1703 return status;
1704 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1705 return nfserr_bad_xdr;
1706 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1707 return nfserr_bad_xdr;
1708 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1709 if (status)
1710 return status;
1711 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1712 if (status)
1713 return status;
1714 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1715 return nfserr_bad_xdr;
1716 return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1717}
1718
1719static __be32
1720nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1721 union nfsd4_op_u *u)
1722{
1723 struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1724 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1725}
1726
1727static __be32
1728nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1729 union nfsd4_op_u *u)
1730{
1731 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1732 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1733}
1734
1735#ifdef CONFIG_NFSD_PNFS
1736static __be32
1737nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1738 union nfsd4_op_u *u)
1739{
1740 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1741 __be32 status;
1742
1743 memset(gdev, 0, sizeof(*gdev));
1744 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1745 if (status)
1746 return status;
1747 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1748 return nfserr_bad_xdr;
1749 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1750 return nfserr_bad_xdr;
1751 if (xdr_stream_decode_uint32_array(argp->xdr,
1752 &gdev->gd_notify_types, 1) < 0)
1753 return nfserr_bad_xdr;
1754
1755 return nfs_ok;
1756}
1757
1758static __be32
1759nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1760 union nfsd4_op_u *u)
1761{
1762 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1763 __be32 *p, status;
1764
1765 memset(lcp, 0, sizeof(*lcp));
1766 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1767 return nfserr_bad_xdr;
1768 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1769 return nfserr_bad_xdr;
1770 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1771 return nfserr_bad_xdr;
1772 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1773 if (status)
1774 return status;
1775 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1776 return nfserr_bad_xdr;
1777 if (lcp->lc_newoffset) {
1778 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1779 return nfserr_bad_xdr;
1780 } else
1781 lcp->lc_last_wr = 0;
1782 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1783 if (!p)
1784 return nfserr_bad_xdr;
1785 if (xdr_item_is_present(p)) {
1786 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1787 if (status)
1788 return status;
1789 } else {
1790 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1791 }
1792 return nfsd4_decode_layoutupdate4(argp, lcp);
1793}
1794
1795static __be32
1796nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1797 union nfsd4_op_u *u)
1798{
1799 struct nfsd4_layoutget *lgp = &u->layoutget;
1800 __be32 status;
1801
1802 memset(lgp, 0, sizeof(*lgp));
1803 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1804 return nfserr_bad_xdr;
1805 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1806 return nfserr_bad_xdr;
1807 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1808 return nfserr_bad_xdr;
1809 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1810 return nfserr_bad_xdr;
1811 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1812 return nfserr_bad_xdr;
1813 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1814 return nfserr_bad_xdr;
1815 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1816 if (status)
1817 return status;
1818 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1819 return nfserr_bad_xdr;
1820
1821 return nfs_ok;
1822}
1823
1824static __be32
1825nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1826 union nfsd4_op_u *u)
1827{
1828 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1829 memset(lrp, 0, sizeof(*lrp));
1830 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1831 return nfserr_bad_xdr;
1832 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1833 return nfserr_bad_xdr;
1834 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1835 return nfserr_bad_xdr;
1836 return nfsd4_decode_layoutreturn4(argp, lrp);
1837}
1838#endif /* CONFIG_NFSD_PNFS */
1839
1840static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1841 union nfsd4_op_u *u)
1842{
1843 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1844 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1845 return nfserr_bad_xdr;
1846
1847 sin->sin_exp = NULL;
1848 return nfs_ok;
1849}
1850
1851static __be32
1852nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1853 union nfsd4_op_u *u)
1854{
1855 struct nfsd4_sequence *seq = &u->sequence;
1856 __be32 *p, status;
1857
1858 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1859 if (status)
1860 return status;
1861 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1862 if (!p)
1863 return nfserr_bad_xdr;
1864 seq->seqid = be32_to_cpup(p++);
1865 seq->slotid = be32_to_cpup(p++);
1866 seq->maxslots = be32_to_cpup(p++);
1867 seq->cachethis = be32_to_cpup(p);
1868
1869 seq->status_flags = 0;
1870 return nfs_ok;
1871}
1872
1873static __be32
1874nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1875 union nfsd4_op_u *u)
1876{
1877 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1878 struct nfsd4_test_stateid_id *stateid;
1879 __be32 status;
1880 u32 i;
1881
1882 memset(test_stateid, 0, sizeof(*test_stateid));
1883 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1884 return nfserr_bad_xdr;
1885
1886 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1887 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1888 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1889 if (!stateid)
1890 return nfserr_jukebox;
1891 INIT_LIST_HEAD(&stateid->ts_id_list);
1892 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1893 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1894 if (status)
1895 return status;
1896 }
1897
1898 return nfs_ok;
1899}
1900
1901static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1902 union nfsd4_op_u *u)
1903{
1904 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1905 return nfsd4_decode_clientid4(argp, &dc->clientid);
1906}
1907
1908static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1909 union nfsd4_op_u *u)
1910{
1911 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1912 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1913 return nfserr_bad_xdr;
1914 return nfs_ok;
1915}
1916
1917static __be32
1918nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1919 union nfsd4_op_u *u)
1920{
1921 struct nfsd4_fallocate *fallocate = &u->allocate;
1922 __be32 status;
1923
1924 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1925 if (status)
1926 return status;
1927 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1928 return nfserr_bad_xdr;
1929 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1930 return nfserr_bad_xdr;
1931
1932 return nfs_ok;
1933}
1934
1935static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1936 struct nl4_server *ns)
1937{
1938 struct nfs42_netaddr *naddr;
1939 __be32 *p;
1940
1941 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1942 return nfserr_bad_xdr;
1943
1944 /* currently support for 1 inter-server source server */
1945 switch (ns->nl4_type) {
1946 case NL4_NETADDR:
1947 naddr = &ns->u.nl4_addr;
1948
1949 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1950 return nfserr_bad_xdr;
1951 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1952 return nfserr_bad_xdr;
1953
1954 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1955 if (!p)
1956 return nfserr_bad_xdr;
1957 memcpy(naddr->netid, p, naddr->netid_len);
1958
1959 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
1960 return nfserr_bad_xdr;
1961 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
1962 return nfserr_bad_xdr;
1963
1964 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
1965 if (!p)
1966 return nfserr_bad_xdr;
1967 memcpy(naddr->addr, p, naddr->addr_len);
1968 break;
1969 default:
1970 return nfserr_bad_xdr;
1971 }
1972
1973 return nfs_ok;
1974}
1975
1976static __be32
1977nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1978{
1979 struct nfsd4_copy *copy = &u->copy;
1980 u32 consecutive, i, count, sync;
1981 struct nl4_server *ns_dummy;
1982 __be32 status;
1983
1984 memset(copy, 0, sizeof(*copy));
1985 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid);
1986 if (status)
1987 return status;
1988 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid);
1989 if (status)
1990 return status;
1991 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0)
1992 return nfserr_bad_xdr;
1993 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0)
1994 return nfserr_bad_xdr;
1995 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0)
1996 return nfserr_bad_xdr;
1997 /* ca_consecutive: we always do consecutive copies */
1998 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
1999 return nfserr_bad_xdr;
2000 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2001 return nfserr_bad_xdr;
2002 nfsd4_copy_set_sync(copy, sync);
2003
2004 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2005 return nfserr_bad_xdr;
2006 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2007 if (copy->cp_src == NULL)
2008 return nfserr_jukebox;
2009 if (count == 0) { /* intra-server copy */
2010 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags);
2011 return nfs_ok;
2012 }
2013
2014 /* decode all the supplied server addresses but use only the first */
2015 status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2016 if (status)
2017 return status;
2018
2019 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2020 if (ns_dummy == NULL)
2021 return nfserr_jukebox;
2022 for (i = 0; i < count - 1; i++) {
2023 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2024 if (status) {
2025 kfree(ns_dummy);
2026 return status;
2027 }
2028 }
2029 kfree(ns_dummy);
2030
2031 return nfs_ok;
2032}
2033
2034static __be32
2035nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2036 union nfsd4_op_u *u)
2037{
2038 struct nfsd4_copy_notify *cn = &u->copy_notify;
2039 __be32 status;
2040
2041 memset(cn, 0, sizeof(*cn));
2042 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2043 if (cn->cpn_src == NULL)
2044 return nfserr_jukebox;
2045 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2046 if (cn->cpn_dst == NULL)
2047 return nfserr_jukebox;
2048
2049 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2050 if (status)
2051 return status;
2052 return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2053}
2054
2055static __be32
2056nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2057 union nfsd4_op_u *u)
2058{
2059 struct nfsd4_offload_status *os = &u->offload_status;
2060 os->count = 0;
2061 os->status = 0;
2062 return nfsd4_decode_stateid4(argp, &os->stateid);
2063}
2064
2065static __be32
2066nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2067{
2068 struct nfsd4_seek *seek = &u->seek;
2069 __be32 status;
2070
2071 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2072 if (status)
2073 return status;
2074 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2075 return nfserr_bad_xdr;
2076 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2077 return nfserr_bad_xdr;
2078
2079 seek->seek_eof = 0;
2080 seek->seek_pos = 0;
2081 return nfs_ok;
2082}
2083
2084static __be32
2085nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2086{
2087 struct nfsd4_clone *clone = &u->clone;
2088 __be32 status;
2089
2090 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2091 if (status)
2092 return status;
2093 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2094 if (status)
2095 return status;
2096 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2097 return nfserr_bad_xdr;
2098 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2099 return nfserr_bad_xdr;
2100 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2101 return nfserr_bad_xdr;
2102
2103 return nfs_ok;
2104}
2105
2106/*
2107 * XDR data that is more than PAGE_SIZE in size is normally part of a
2108 * read or write. However, the size of extended attributes is limited
2109 * by the maximum request size, and then further limited by the underlying
2110 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2111 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2112 * and we're not dealing with contiguous pages, we need to do some copying.
2113 */
2114
2115/*
2116 * Decode data into buffer.
2117 */
2118static __be32
2119nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2120 char **bufp, u32 buflen)
2121{
2122 struct page **pages = xdr->pages;
2123 struct kvec *head = xdr->head;
2124 char *tmp, *dp;
2125 u32 len;
2126
2127 if (buflen <= head->iov_len) {
2128 /*
2129 * We're in luck, the head has enough space. Just return
2130 * the head, no need for copying.
2131 */
2132 *bufp = head->iov_base;
2133 return 0;
2134 }
2135
2136 tmp = svcxdr_tmpalloc(argp, buflen);
2137 if (tmp == NULL)
2138 return nfserr_jukebox;
2139
2140 dp = tmp;
2141 memcpy(dp, head->iov_base, head->iov_len);
2142 buflen -= head->iov_len;
2143 dp += head->iov_len;
2144
2145 while (buflen > 0) {
2146 len = min_t(u32, buflen, PAGE_SIZE);
2147 memcpy(dp, page_address(*pages), len);
2148
2149 buflen -= len;
2150 dp += len;
2151 pages++;
2152 }
2153
2154 *bufp = tmp;
2155 return 0;
2156}
2157
2158/*
2159 * Get a user extended attribute name from the XDR buffer.
2160 * It will not have the "user." prefix, so prepend it.
2161 * Lastly, check for nul characters in the name.
2162 */
2163static __be32
2164nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2165{
2166 char *name, *sp, *dp;
2167 u32 namelen, cnt;
2168 __be32 *p;
2169
2170 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2171 return nfserr_bad_xdr;
2172 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2173 return nfserr_nametoolong;
2174 if (namelen == 0)
2175 return nfserr_bad_xdr;
2176 p = xdr_inline_decode(argp->xdr, namelen);
2177 if (!p)
2178 return nfserr_bad_xdr;
2179 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2180 if (!name)
2181 return nfserr_jukebox;
2182 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2183
2184 /*
2185 * Copy the extended attribute name over while checking for 0
2186 * characters.
2187 */
2188 sp = (char *)p;
2189 dp = name + XATTR_USER_PREFIX_LEN;
2190 cnt = namelen;
2191
2192 while (cnt-- > 0) {
2193 if (*sp == '\0')
2194 return nfserr_bad_xdr;
2195 *dp++ = *sp++;
2196 }
2197 *dp = '\0';
2198
2199 *namep = name;
2200
2201 return nfs_ok;
2202}
2203
2204/*
2205 * A GETXATTR op request comes without a length specifier. We just set the
2206 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2207 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2208 * check it against getxa_len, and allocate + return the value.
2209 */
2210static __be32
2211nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2212 union nfsd4_op_u *u)
2213{
2214 struct nfsd4_getxattr *getxattr = &u->getxattr;
2215 __be32 status;
2216 u32 maxcount;
2217
2218 memset(getxattr, 0, sizeof(*getxattr));
2219 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2220 if (status)
2221 return status;
2222
2223 maxcount = svc_max_payload(argp->rqstp);
2224 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2225
2226 getxattr->getxa_len = maxcount;
2227 return nfs_ok;
2228}
2229
2230static __be32
2231nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2232 union nfsd4_op_u *u)
2233{
2234 struct nfsd4_setxattr *setxattr = &u->setxattr;
2235 u32 flags, maxcount, size;
2236 __be32 status;
2237
2238 memset(setxattr, 0, sizeof(*setxattr));
2239
2240 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2241 return nfserr_bad_xdr;
2242
2243 if (flags > SETXATTR4_REPLACE)
2244 return nfserr_inval;
2245 setxattr->setxa_flags = flags;
2246
2247 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2248 if (status)
2249 return status;
2250
2251 maxcount = svc_max_payload(argp->rqstp);
2252 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2253
2254 if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2255 return nfserr_bad_xdr;
2256 if (size > maxcount)
2257 return nfserr_xattr2big;
2258
2259 setxattr->setxa_len = size;
2260 if (size > 0) {
2261 struct xdr_buf payload;
2262
2263 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2264 return nfserr_bad_xdr;
2265 status = nfsd4_vbuf_from_vector(argp, &payload,
2266 &setxattr->setxa_buf, size);
2267 }
2268
2269 return nfs_ok;
2270}
2271
2272static __be32
2273nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2274 union nfsd4_op_u *u)
2275{
2276 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2277 u32 maxcount;
2278
2279 memset(listxattrs, 0, sizeof(*listxattrs));
2280
2281 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2282 return nfserr_bad_xdr;
2283
2284 /*
2285 * If the cookie is too large to have even one user.x attribute
2286 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2287 */
2288 if (listxattrs->lsxa_cookie >=
2289 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2290 return nfserr_badcookie;
2291
2292 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2293 return nfserr_bad_xdr;
2294 if (maxcount < 8)
2295 /* Always need at least 2 words (length and one character) */
2296 return nfserr_inval;
2297
2298 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2299 listxattrs->lsxa_maxcount = maxcount;
2300
2301 return nfs_ok;
2302}
2303
2304static __be32
2305nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2306 union nfsd4_op_u *u)
2307{
2308 struct nfsd4_removexattr *removexattr = &u->removexattr;
2309 memset(removexattr, 0, sizeof(*removexattr));
2310 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2311}
2312
2313static __be32
2314nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2315{
2316 return nfs_ok;
2317}
2318
2319static __be32
2320nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2321{
2322 return nfserr_notsupp;
2323}
2324
2325typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2326
2327static const nfsd4_dec nfsd4_dec_ops[] = {
2328 [OP_ACCESS] = nfsd4_decode_access,
2329 [OP_CLOSE] = nfsd4_decode_close,
2330 [OP_COMMIT] = nfsd4_decode_commit,
2331 [OP_CREATE] = nfsd4_decode_create,
2332 [OP_DELEGPURGE] = nfsd4_decode_notsupp,
2333 [OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2334 [OP_GETATTR] = nfsd4_decode_getattr,
2335 [OP_GETFH] = nfsd4_decode_noop,
2336 [OP_LINK] = nfsd4_decode_link,
2337 [OP_LOCK] = nfsd4_decode_lock,
2338 [OP_LOCKT] = nfsd4_decode_lockt,
2339 [OP_LOCKU] = nfsd4_decode_locku,
2340 [OP_LOOKUP] = nfsd4_decode_lookup,
2341 [OP_LOOKUPP] = nfsd4_decode_noop,
2342 [OP_NVERIFY] = nfsd4_decode_verify,
2343 [OP_OPEN] = nfsd4_decode_open,
2344 [OP_OPENATTR] = nfsd4_decode_notsupp,
2345 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2346 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2347 [OP_PUTFH] = nfsd4_decode_putfh,
2348 [OP_PUTPUBFH] = nfsd4_decode_putpubfh,
2349 [OP_PUTROOTFH] = nfsd4_decode_noop,
2350 [OP_READ] = nfsd4_decode_read,
2351 [OP_READDIR] = nfsd4_decode_readdir,
2352 [OP_READLINK] = nfsd4_decode_noop,
2353 [OP_REMOVE] = nfsd4_decode_remove,
2354 [OP_RENAME] = nfsd4_decode_rename,
2355 [OP_RENEW] = nfsd4_decode_renew,
2356 [OP_RESTOREFH] = nfsd4_decode_noop,
2357 [OP_SAVEFH] = nfsd4_decode_noop,
2358 [OP_SECINFO] = nfsd4_decode_secinfo,
2359 [OP_SETATTR] = nfsd4_decode_setattr,
2360 [OP_SETCLIENTID] = nfsd4_decode_setclientid,
2361 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2362 [OP_VERIFY] = nfsd4_decode_verify,
2363 [OP_WRITE] = nfsd4_decode_write,
2364 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2365
2366 /* new operations for NFSv4.1 */
2367 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2368 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2369 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2370 [OP_CREATE_SESSION] = nfsd4_decode_create_session,
2371 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2372 [OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2373 [OP_GET_DIR_DELEGATION] = nfsd4_decode_notsupp,
2374#ifdef CONFIG_NFSD_PNFS
2375 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2376 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2377 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2378 [OP_LAYOUTGET] = nfsd4_decode_layoutget,
2379 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
2380#else
2381 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2382 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2383 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2384 [OP_LAYOUTGET] = nfsd4_decode_notsupp,
2385 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
2386#endif
2387 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2388 [OP_SEQUENCE] = nfsd4_decode_sequence,
2389 [OP_SET_SSV] = nfsd4_decode_notsupp,
2390 [OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2391 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2392 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2393 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
2394
2395 /* new operations for NFSv4.2 */
2396 [OP_ALLOCATE] = nfsd4_decode_fallocate,
2397 [OP_COPY] = nfsd4_decode_copy,
2398 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2399 [OP_DEALLOCATE] = nfsd4_decode_fallocate,
2400 [OP_IO_ADVISE] = nfsd4_decode_notsupp,
2401 [OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2402 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2403 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2404 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2405 [OP_READ_PLUS] = nfsd4_decode_read,
2406 [OP_SEEK] = nfsd4_decode_seek,
2407 [OP_WRITE_SAME] = nfsd4_decode_notsupp,
2408 [OP_CLONE] = nfsd4_decode_clone,
2409 /* RFC 8276 extended atributes operations */
2410 [OP_GETXATTR] = nfsd4_decode_getxattr,
2411 [OP_SETXATTR] = nfsd4_decode_setxattr,
2412 [OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2413 [OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2414};
2415
2416static inline bool
2417nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2418{
2419 if (op->opnum < FIRST_NFS4_OP)
2420 return false;
2421 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2422 return false;
2423 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2424 return false;
2425 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2426 return false;
2427 return true;
2428}
2429
2430static bool
2431nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2432{
2433 struct nfsd4_op *op;
2434 bool cachethis = false;
2435 int auth_slack= argp->rqstp->rq_auth_slack;
2436 int max_reply = auth_slack + 8; /* opcnt, status */
2437 int readcount = 0;
2438 int readbytes = 0;
2439 __be32 *p;
2440 int i;
2441
2442 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2443 return false;
2444 max_reply += XDR_UNIT;
2445 argp->tag = NULL;
2446 if (unlikely(argp->taglen)) {
2447 if (argp->taglen > NFSD4_MAX_TAGLEN)
2448 return false;
2449 p = xdr_inline_decode(argp->xdr, argp->taglen);
2450 if (!p)
2451 return false;
2452 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2453 if (!argp->tag)
2454 return false;
2455 max_reply += xdr_align_size(argp->taglen);
2456 }
2457
2458 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2459 return false;
2460 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2461 return false;
2462 argp->opcnt = min_t(u32, argp->client_opcnt,
2463 NFSD_MAX_OPS_PER_COMPOUND);
2464
2465 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2466 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2467 if (!argp->ops) {
2468 argp->ops = argp->iops;
2469 return false;
2470 }
2471 }
2472
2473 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2474 argp->opcnt = 0;
2475
2476 for (i = 0; i < argp->opcnt; i++) {
2477 op = &argp->ops[i];
2478 op->replay = NULL;
2479
2480 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2481 return false;
2482 if (nfsd4_opnum_in_range(argp, op)) {
2483 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2484 if (op->status != nfs_ok)
2485 trace_nfsd_compound_decode_err(argp->rqstp,
2486 argp->opcnt, i,
2487 op->opnum,
2488 op->status);
2489 } else {
2490 op->opnum = OP_ILLEGAL;
2491 op->status = nfserr_op_illegal;
2492 }
2493 op->opdesc = OPDESC(op);
2494 /*
2495 * We'll try to cache the result in the DRC if any one
2496 * op in the compound wants to be cached:
2497 */
2498 cachethis |= nfsd4_cache_this_op(op);
2499
2500 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2501 readcount++;
2502 readbytes += nfsd4_max_reply(argp->rqstp, op);
2503 } else
2504 max_reply += nfsd4_max_reply(argp->rqstp, op);
2505 /*
2506 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2507 * (Special case because it will just skip encoding this
2508 * if it runs out of xdr buffer space, and it is the only
2509 * operation that behaves this way.)
2510 */
2511 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2512 max_reply += NFS4_OPAQUE_LIMIT;
2513
2514 if (op->status) {
2515 argp->opcnt = i+1;
2516 break;
2517 }
2518 }
2519 /* Sessions make the DRC unnecessary: */
2520 if (argp->minorversion)
2521 cachethis = false;
2522 svc_reserve(argp->rqstp, max_reply + readbytes);
2523 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2524
2525 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2526 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
2527
2528 return true;
2529}
2530
2531static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
2532 struct svc_export *exp)
2533{
2534 if (exp->ex_flags & NFSEXP_V4ROOT) {
2535 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
2536 *p++ = 0;
2537 } else
2538 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
2539 return p;
2540}
2541
2542/*
2543 * ctime (in NFSv4, time_metadata) is not writeable, and the client
2544 * doesn't really care what resolution could theoretically be stored by
2545 * the filesystem.
2546 *
2547 * The client cares how close together changes can be while still
2548 * guaranteeing ctime changes. For most filesystems (which have
2549 * timestamps with nanosecond fields) that is limited by the resolution
2550 * of the time returned from current_time() (which I'm assuming to be
2551 * 1/HZ).
2552 */
2553static __be32 *encode_time_delta(__be32 *p, struct inode *inode)
2554{
2555 struct timespec64 ts;
2556 u32 ns;
2557
2558 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
2559 ts = ns_to_timespec64(ns);
2560
2561 p = xdr_encode_hyper(p, ts.tv_sec);
2562 *p++ = cpu_to_be32(ts.tv_nsec);
2563
2564 return p;
2565}
2566
2567static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2568{
2569 *p++ = cpu_to_be32(c->atomic);
2570 p = xdr_encode_hyper(p, c->before_change);
2571 p = xdr_encode_hyper(p, c->after_change);
2572 return p;
2573}
2574
2575/* Encode as an array of strings the string given with components
2576 * separated @sep, escaped with esc_enter and esc_exit.
2577 */
2578static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2579 char *components, char esc_enter,
2580 char esc_exit)
2581{
2582 __be32 *p;
2583 __be32 pathlen;
2584 int pathlen_offset;
2585 int strlen, count=0;
2586 char *str, *end, *next;
2587
2588 dprintk("nfsd4_encode_components(%s)\n", components);
2589
2590 pathlen_offset = xdr->buf->len;
2591 p = xdr_reserve_space(xdr, 4);
2592 if (!p)
2593 return nfserr_resource;
2594 p++; /* We will fill this in with @count later */
2595
2596 end = str = components;
2597 while (*end) {
2598 bool found_esc = false;
2599
2600 /* try to parse as esc_start, ..., esc_end, sep */
2601 if (*str == esc_enter) {
2602 for (; *end && (*end != esc_exit); end++)
2603 /* find esc_exit or end of string */;
2604 next = end + 1;
2605 if (*end && (!*next || *next == sep)) {
2606 str++;
2607 found_esc = true;
2608 }
2609 }
2610
2611 if (!found_esc)
2612 for (; *end && (*end != sep); end++)
2613 /* find sep or end of string */;
2614
2615 strlen = end - str;
2616 if (strlen) {
2617 p = xdr_reserve_space(xdr, strlen + 4);
2618 if (!p)
2619 return nfserr_resource;
2620 p = xdr_encode_opaque(p, str, strlen);
2621 count++;
2622 }
2623 else
2624 end++;
2625 if (found_esc)
2626 end = next;
2627
2628 str = end;
2629 }
2630 pathlen = htonl(count);
2631 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2632 return 0;
2633}
2634
2635/* Encode as an array of strings the string given with components
2636 * separated @sep.
2637 */
2638static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2639 char *components)
2640{
2641 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2642}
2643
2644/*
2645 * encode a location element of a fs_locations structure
2646 */
2647static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2648 struct nfsd4_fs_location *location)
2649{
2650 __be32 status;
2651
2652 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2653 '[', ']');
2654 if (status)
2655 return status;
2656 status = nfsd4_encode_components(xdr, '/', location->path);
2657 if (status)
2658 return status;
2659 return 0;
2660}
2661
2662/*
2663 * Encode a path in RFC3530 'pathname4' format
2664 */
2665static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2666 const struct path *root,
2667 const struct path *path)
2668{
2669 struct path cur = *path;
2670 __be32 *p;
2671 struct dentry **components = NULL;
2672 unsigned int ncomponents = 0;
2673 __be32 err = nfserr_jukebox;
2674
2675 dprintk("nfsd4_encode_components(");
2676
2677 path_get(&cur);
2678 /* First walk the path up to the nfsd root, and store the
2679 * dentries/path components in an array.
2680 */
2681 for (;;) {
2682 if (path_equal(&cur, root))
2683 break;
2684 if (cur.dentry == cur.mnt->mnt_root) {
2685 if (follow_up(&cur))
2686 continue;
2687 goto out_free;
2688 }
2689 if ((ncomponents & 15) == 0) {
2690 struct dentry **new;
2691 new = krealloc(components,
2692 sizeof(*new) * (ncomponents + 16),
2693 GFP_KERNEL);
2694 if (!new)
2695 goto out_free;
2696 components = new;
2697 }
2698 components[ncomponents++] = cur.dentry;
2699 cur.dentry = dget_parent(cur.dentry);
2700 }
2701 err = nfserr_resource;
2702 p = xdr_reserve_space(xdr, 4);
2703 if (!p)
2704 goto out_free;
2705 *p++ = cpu_to_be32(ncomponents);
2706
2707 while (ncomponents) {
2708 struct dentry *dentry = components[ncomponents - 1];
2709 unsigned int len;
2710
2711 spin_lock(&dentry->d_lock);
2712 len = dentry->d_name.len;
2713 p = xdr_reserve_space(xdr, len + 4);
2714 if (!p) {
2715 spin_unlock(&dentry->d_lock);
2716 goto out_free;
2717 }
2718 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2719 dprintk("/%pd", dentry);
2720 spin_unlock(&dentry->d_lock);
2721 dput(dentry);
2722 ncomponents--;
2723 }
2724
2725 err = 0;
2726out_free:
2727 dprintk(")\n");
2728 while (ncomponents)
2729 dput(components[--ncomponents]);
2730 kfree(components);
2731 path_put(&cur);
2732 return err;
2733}
2734
2735static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2736 struct svc_rqst *rqstp, const struct path *path)
2737{
2738 struct svc_export *exp_ps;
2739 __be32 res;
2740
2741 exp_ps = rqst_find_fsidzero_export(rqstp);
2742 if (IS_ERR(exp_ps))
2743 return nfserrno(PTR_ERR(exp_ps));
2744 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2745 exp_put(exp_ps);
2746 return res;
2747}
2748
2749/*
2750 * encode a fs_locations structure
2751 */
2752static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2753 struct svc_rqst *rqstp, struct svc_export *exp)
2754{
2755 __be32 status;
2756 int i;
2757 __be32 *p;
2758 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2759
2760 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2761 if (status)
2762 return status;
2763 p = xdr_reserve_space(xdr, 4);
2764 if (!p)
2765 return nfserr_resource;
2766 *p++ = cpu_to_be32(fslocs->locations_count);
2767 for (i=0; i<fslocs->locations_count; i++) {
2768 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2769 if (status)
2770 return status;
2771 }
2772 return 0;
2773}
2774
2775static u32 nfs4_file_type(umode_t mode)
2776{
2777 switch (mode & S_IFMT) {
2778 case S_IFIFO: return NF4FIFO;
2779 case S_IFCHR: return NF4CHR;
2780 case S_IFDIR: return NF4DIR;
2781 case S_IFBLK: return NF4BLK;
2782 case S_IFLNK: return NF4LNK;
2783 case S_IFREG: return NF4REG;
2784 case S_IFSOCK: return NF4SOCK;
2785 default: return NF4BAD;
2786 }
2787}
2788
2789static inline __be32
2790nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2791 struct nfs4_ace *ace)
2792{
2793 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2794 return nfs4_acl_write_who(xdr, ace->whotype);
2795 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2796 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2797 else
2798 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2799}
2800
2801static inline __be32
2802nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2803{
2804 __be32 *p;
2805 unsigned long i = hweight_long(layout_types);
2806
2807 p = xdr_reserve_space(xdr, 4 + 4 * i);
2808 if (!p)
2809 return nfserr_resource;
2810
2811 *p++ = cpu_to_be32(i);
2812
2813 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2814 if (layout_types & (1 << i))
2815 *p++ = cpu_to_be32(i);
2816
2817 return 0;
2818}
2819
2820#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2821 FATTR4_WORD0_RDATTR_ERROR)
2822#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2823#define WORD2_ABSENT_FS_ATTRS 0
2824
2825#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2826static inline __be32
2827nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2828 void *context, int len)
2829{
2830 __be32 *p;
2831
2832 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2833 if (!p)
2834 return nfserr_resource;
2835
2836 /*
2837 * For now we use a 0 here to indicate the null translation; in
2838 * the future we may place a call to translation code here.
2839 */
2840 *p++ = cpu_to_be32(0); /* lfs */
2841 *p++ = cpu_to_be32(0); /* pi */
2842 p = xdr_encode_opaque(p, context, len);
2843 return 0;
2844}
2845#else
2846static inline __be32
2847nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2848 void *context, int len)
2849{ return 0; }
2850#endif
2851
2852static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2853{
2854 /* As per referral draft: */
2855 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2856 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2857 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2858 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2859 *rdattr_err = NFSERR_MOVED;
2860 else
2861 return nfserr_moved;
2862 }
2863 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2864 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2865 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2866 return 0;
2867}
2868
2869
2870static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2871{
2872 struct path path = exp->ex_path;
2873 struct kstat stat;
2874 int err;
2875
2876 path_get(&path);
2877 while (follow_up(&path)) {
2878 if (path.dentry != path.mnt->mnt_root)
2879 break;
2880 }
2881 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2882 path_put(&path);
2883 if (!err)
2884 *pino = stat.ino;
2885 return err;
2886}
2887
2888static __be32
2889nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2890{
2891 __be32 *p;
2892
2893 if (bmval2) {
2894 p = xdr_reserve_space(xdr, 16);
2895 if (!p)
2896 goto out_resource;
2897 *p++ = cpu_to_be32(3);
2898 *p++ = cpu_to_be32(bmval0);
2899 *p++ = cpu_to_be32(bmval1);
2900 *p++ = cpu_to_be32(bmval2);
2901 } else if (bmval1) {
2902 p = xdr_reserve_space(xdr, 12);
2903 if (!p)
2904 goto out_resource;
2905 *p++ = cpu_to_be32(2);
2906 *p++ = cpu_to_be32(bmval0);
2907 *p++ = cpu_to_be32(bmval1);
2908 } else {
2909 p = xdr_reserve_space(xdr, 8);
2910 if (!p)
2911 goto out_resource;
2912 *p++ = cpu_to_be32(1);
2913 *p++ = cpu_to_be32(bmval0);
2914 }
2915
2916 return 0;
2917out_resource:
2918 return nfserr_resource;
2919}
2920
2921/*
2922 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2923 * ourselves.
2924 */
2925static __be32
2926nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2927 struct svc_export *exp,
2928 struct dentry *dentry, u32 *bmval,
2929 struct svc_rqst *rqstp, int ignore_crossmnt)
2930{
2931 u32 bmval0 = bmval[0];
2932 u32 bmval1 = bmval[1];
2933 u32 bmval2 = bmval[2];
2934 struct kstat stat;
2935 struct svc_fh *tempfh = NULL;
2936 struct kstatfs statfs;
2937 __be32 *p, *attrlen_p;
2938 int starting_len = xdr->buf->len;
2939 int attrlen_offset;
2940 u32 dummy;
2941 u64 dummy64;
2942 u32 rdattr_err = 0;
2943 __be32 status;
2944 int err;
2945 struct nfs4_acl *acl = NULL;
2946#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2947 void *context = NULL;
2948 int contextlen;
2949#endif
2950 bool contextsupport = false;
2951 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2952 u32 minorversion = resp->cstate.minorversion;
2953 struct path path = {
2954 .mnt = exp->ex_path.mnt,
2955 .dentry = dentry,
2956 };
2957 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2958
2959 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2960 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2961
2962 if (exp->ex_fslocs.migrated) {
2963 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2964 if (status)
2965 goto out;
2966 }
2967
2968 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2969 if (err)
2970 goto out_nfserr;
2971 if (!(stat.result_mask & STATX_BTIME))
2972 /* underlying FS does not offer btime so we can't share it */
2973 bmval1 &= ~FATTR4_WORD1_TIME_CREATE;
2974 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2975 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2976 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2977 FATTR4_WORD1_SPACE_TOTAL))) {
2978 err = vfs_statfs(&path, &statfs);
2979 if (err)
2980 goto out_nfserr;
2981 }
2982 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2983 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2984 status = nfserr_jukebox;
2985 if (!tempfh)
2986 goto out;
2987 fh_init(tempfh, NFS4_FHSIZE);
2988 status = fh_compose(tempfh, exp, dentry, NULL);
2989 if (status)
2990 goto out;
2991 fhp = tempfh;
2992 }
2993 if (bmval0 & FATTR4_WORD0_ACL) {
2994 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2995 if (err == -EOPNOTSUPP)
2996 bmval0 &= ~FATTR4_WORD0_ACL;
2997 else if (err == -EINVAL) {
2998 status = nfserr_attrnotsupp;
2999 goto out;
3000 } else if (err != 0)
3001 goto out_nfserr;
3002 }
3003
3004#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3005 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
3006 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3007 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3008 err = security_inode_getsecctx(d_inode(dentry),
3009 &context, &contextlen);
3010 else
3011 err = -EOPNOTSUPP;
3012 contextsupport = (err == 0);
3013 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3014 if (err == -EOPNOTSUPP)
3015 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
3016 else if (err)
3017 goto out_nfserr;
3018 }
3019 }
3020#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3021
3022 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
3023 if (status)
3024 goto out;
3025
3026 attrlen_offset = xdr->buf->len;
3027 attrlen_p = xdr_reserve_space(xdr, XDR_UNIT);
3028 if (!attrlen_p)
3029 goto out_resource;
3030
3031 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
3032 u32 supp[3];
3033
3034 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3035
3036 if (!IS_POSIXACL(dentry->d_inode))
3037 supp[0] &= ~FATTR4_WORD0_ACL;
3038 if (!contextsupport)
3039 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3040 if (!supp[2]) {
3041 p = xdr_reserve_space(xdr, 12);
3042 if (!p)
3043 goto out_resource;
3044 *p++ = cpu_to_be32(2);
3045 *p++ = cpu_to_be32(supp[0]);
3046 *p++ = cpu_to_be32(supp[1]);
3047 } else {
3048 p = xdr_reserve_space(xdr, 16);
3049 if (!p)
3050 goto out_resource;
3051 *p++ = cpu_to_be32(3);
3052 *p++ = cpu_to_be32(supp[0]);
3053 *p++ = cpu_to_be32(supp[1]);
3054 *p++ = cpu_to_be32(supp[2]);
3055 }
3056 }
3057 if (bmval0 & FATTR4_WORD0_TYPE) {
3058 p = xdr_reserve_space(xdr, 4);
3059 if (!p)
3060 goto out_resource;
3061 dummy = nfs4_file_type(stat.mode);
3062 if (dummy == NF4BAD) {
3063 status = nfserr_serverfault;
3064 goto out;
3065 }
3066 *p++ = cpu_to_be32(dummy);
3067 }
3068 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
3069 p = xdr_reserve_space(xdr, 4);
3070 if (!p)
3071 goto out_resource;
3072 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
3073 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
3074 else
3075 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
3076 NFS4_FH_VOL_RENAME);
3077 }
3078 if (bmval0 & FATTR4_WORD0_CHANGE) {
3079 p = xdr_reserve_space(xdr, 8);
3080 if (!p)
3081 goto out_resource;
3082 p = encode_change(p, &stat, d_inode(dentry), exp);
3083 }
3084 if (bmval0 & FATTR4_WORD0_SIZE) {
3085 p = xdr_reserve_space(xdr, 8);
3086 if (!p)
3087 goto out_resource;
3088 p = xdr_encode_hyper(p, stat.size);
3089 }
3090 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
3091 p = xdr_reserve_space(xdr, 4);
3092 if (!p)
3093 goto out_resource;
3094 *p++ = cpu_to_be32(1);
3095 }
3096 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
3097 p = xdr_reserve_space(xdr, 4);
3098 if (!p)
3099 goto out_resource;
3100 *p++ = cpu_to_be32(1);
3101 }
3102 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
3103 p = xdr_reserve_space(xdr, 4);
3104 if (!p)
3105 goto out_resource;
3106 *p++ = cpu_to_be32(0);
3107 }
3108 if (bmval0 & FATTR4_WORD0_FSID) {
3109 p = xdr_reserve_space(xdr, 16);
3110 if (!p)
3111 goto out_resource;
3112 if (exp->ex_fslocs.migrated) {
3113 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3114 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3115 } else switch(fsid_source(fhp)) {
3116 case FSIDSOURCE_FSID:
3117 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
3118 p = xdr_encode_hyper(p, (u64)0);
3119 break;
3120 case FSIDSOURCE_DEV:
3121 *p++ = cpu_to_be32(0);
3122 *p++ = cpu_to_be32(MAJOR(stat.dev));
3123 *p++ = cpu_to_be32(0);
3124 *p++ = cpu_to_be32(MINOR(stat.dev));
3125 break;
3126 case FSIDSOURCE_UUID:
3127 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
3128 EX_UUID_LEN);
3129 break;
3130 }
3131 }
3132 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
3133 p = xdr_reserve_space(xdr, 4);
3134 if (!p)
3135 goto out_resource;
3136 *p++ = cpu_to_be32(0);
3137 }
3138 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
3139 p = xdr_reserve_space(xdr, 4);
3140 if (!p)
3141 goto out_resource;
3142 *p++ = cpu_to_be32(nn->nfsd4_lease);
3143 }
3144 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
3145 p = xdr_reserve_space(xdr, 4);
3146 if (!p)
3147 goto out_resource;
3148 *p++ = cpu_to_be32(rdattr_err);
3149 }
3150 if (bmval0 & FATTR4_WORD0_ACL) {
3151 struct nfs4_ace *ace;
3152
3153 if (acl == NULL) {
3154 p = xdr_reserve_space(xdr, 4);
3155 if (!p)
3156 goto out_resource;
3157
3158 *p++ = cpu_to_be32(0);
3159 goto out_acl;
3160 }
3161 p = xdr_reserve_space(xdr, 4);
3162 if (!p)
3163 goto out_resource;
3164 *p++ = cpu_to_be32(acl->naces);
3165
3166 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3167 p = xdr_reserve_space(xdr, 4*3);
3168 if (!p)
3169 goto out_resource;
3170 *p++ = cpu_to_be32(ace->type);
3171 *p++ = cpu_to_be32(ace->flag);
3172 *p++ = cpu_to_be32(ace->access_mask &
3173 NFS4_ACE_MASK_ALL);
3174 status = nfsd4_encode_aclname(xdr, rqstp, ace);
3175 if (status)
3176 goto out;
3177 }
3178 }
3179out_acl:
3180 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
3181 p = xdr_reserve_space(xdr, 4);
3182 if (!p)
3183 goto out_resource;
3184 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
3185 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
3186 }
3187 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
3188 p = xdr_reserve_space(xdr, 4);
3189 if (!p)
3190 goto out_resource;
3191 *p++ = cpu_to_be32(1);
3192 }
3193 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
3194 p = xdr_reserve_space(xdr, 4);
3195 if (!p)
3196 goto out_resource;
3197 *p++ = cpu_to_be32(0);
3198 }
3199 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
3200 p = xdr_reserve_space(xdr, 4);
3201 if (!p)
3202 goto out_resource;
3203 *p++ = cpu_to_be32(1);
3204 }
3205 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
3206 p = xdr_reserve_space(xdr, 4);
3207 if (!p)
3208 goto out_resource;
3209 *p++ = cpu_to_be32(1);
3210 }
3211 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
3212 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
3213 if (!p)
3214 goto out_resource;
3215 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw,
3216 fhp->fh_handle.fh_size);
3217 }
3218 if (bmval0 & FATTR4_WORD0_FILEID) {
3219 p = xdr_reserve_space(xdr, 8);
3220 if (!p)
3221 goto out_resource;
3222 p = xdr_encode_hyper(p, stat.ino);
3223 }
3224 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
3225 p = xdr_reserve_space(xdr, 8);
3226 if (!p)
3227 goto out_resource;
3228 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3229 }
3230 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
3231 p = xdr_reserve_space(xdr, 8);
3232 if (!p)
3233 goto out_resource;
3234 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
3235 }
3236 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
3237 p = xdr_reserve_space(xdr, 8);
3238 if (!p)
3239 goto out_resource;
3240 p = xdr_encode_hyper(p, (u64) statfs.f_files);
3241 }
3242 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
3243 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
3244 if (status)
3245 goto out;
3246 }
3247 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
3248 p = xdr_reserve_space(xdr, 4);
3249 if (!p)
3250 goto out_resource;
3251 *p++ = cpu_to_be32(1);
3252 }
3253 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
3254 p = xdr_reserve_space(xdr, 8);
3255 if (!p)
3256 goto out_resource;
3257 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
3258 }
3259 if (bmval0 & FATTR4_WORD0_MAXLINK) {
3260 p = xdr_reserve_space(xdr, 4);
3261 if (!p)
3262 goto out_resource;
3263 *p++ = cpu_to_be32(255);
3264 }
3265 if (bmval0 & FATTR4_WORD0_MAXNAME) {
3266 p = xdr_reserve_space(xdr, 4);
3267 if (!p)
3268 goto out_resource;
3269 *p++ = cpu_to_be32(statfs.f_namelen);
3270 }
3271 if (bmval0 & FATTR4_WORD0_MAXREAD) {
3272 p = xdr_reserve_space(xdr, 8);
3273 if (!p)
3274 goto out_resource;
3275 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3276 }
3277 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
3278 p = xdr_reserve_space(xdr, 8);
3279 if (!p)
3280 goto out_resource;
3281 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
3282 }
3283 if (bmval1 & FATTR4_WORD1_MODE) {
3284 p = xdr_reserve_space(xdr, 4);
3285 if (!p)
3286 goto out_resource;
3287 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
3288 }
3289 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
3290 p = xdr_reserve_space(xdr, 4);
3291 if (!p)
3292 goto out_resource;
3293 *p++ = cpu_to_be32(1);
3294 }
3295 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
3296 p = xdr_reserve_space(xdr, 4);
3297 if (!p)
3298 goto out_resource;
3299 *p++ = cpu_to_be32(stat.nlink);
3300 }
3301 if (bmval1 & FATTR4_WORD1_OWNER) {
3302 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
3303 if (status)
3304 goto out;
3305 }
3306 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
3307 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
3308 if (status)
3309 goto out;
3310 }
3311 if (bmval1 & FATTR4_WORD1_RAWDEV) {
3312 p = xdr_reserve_space(xdr, 8);
3313 if (!p)
3314 goto out_resource;
3315 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
3316 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
3317 }
3318 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
3319 p = xdr_reserve_space(xdr, 8);
3320 if (!p)
3321 goto out_resource;
3322 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
3323 p = xdr_encode_hyper(p, dummy64);
3324 }
3325 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
3326 p = xdr_reserve_space(xdr, 8);
3327 if (!p)
3328 goto out_resource;
3329 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
3330 p = xdr_encode_hyper(p, dummy64);
3331 }
3332 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
3333 p = xdr_reserve_space(xdr, 8);
3334 if (!p)
3335 goto out_resource;
3336 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
3337 p = xdr_encode_hyper(p, dummy64);
3338 }
3339 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
3340 p = xdr_reserve_space(xdr, 8);
3341 if (!p)
3342 goto out_resource;
3343 dummy64 = (u64)stat.blocks << 9;
3344 p = xdr_encode_hyper(p, dummy64);
3345 }
3346 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
3347 p = xdr_reserve_space(xdr, 12);
3348 if (!p)
3349 goto out_resource;
3350 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
3351 *p++ = cpu_to_be32(stat.atime.tv_nsec);
3352 }
3353 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
3354 p = xdr_reserve_space(xdr, 12);
3355 if (!p)
3356 goto out_resource;
3357 p = encode_time_delta(p, d_inode(dentry));
3358 }
3359 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
3360 p = xdr_reserve_space(xdr, 12);
3361 if (!p)
3362 goto out_resource;
3363 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
3364 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
3365 }
3366 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
3367 p = xdr_reserve_space(xdr, 12);
3368 if (!p)
3369 goto out_resource;
3370 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
3371 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
3372 }
3373 if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
3374 p = xdr_reserve_space(xdr, 12);
3375 if (!p)
3376 goto out_resource;
3377 p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
3378 *p++ = cpu_to_be32(stat.btime.tv_nsec);
3379 }
3380 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
3381 u64 ino = stat.ino;
3382
3383 p = xdr_reserve_space(xdr, 8);
3384 if (!p)
3385 goto out_resource;
3386 /*
3387 * Get ino of mountpoint in parent filesystem, if not ignoring
3388 * crossmount and this is the root of a cross-mounted
3389 * filesystem.
3390 */
3391 if (ignore_crossmnt == 0 &&
3392 dentry == exp->ex_path.mnt->mnt_root) {
3393 err = nfsd4_get_mounted_on_ino(exp, &ino);
3394 if (err)
3395 goto out_nfserr;
3396 }
3397 p = xdr_encode_hyper(p, ino);
3398 }
3399#ifdef CONFIG_NFSD_PNFS
3400 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
3401 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3402 if (status)
3403 goto out;
3404 }
3405
3406 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
3407 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
3408 if (status)
3409 goto out;
3410 }
3411
3412 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
3413 p = xdr_reserve_space(xdr, 4);
3414 if (!p)
3415 goto out_resource;
3416 *p++ = cpu_to_be32(stat.blksize);
3417 }
3418#endif /* CONFIG_NFSD_PNFS */
3419 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
3420 u32 supp[3];
3421
3422 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
3423 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3424 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3425 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3426
3427 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
3428 if (status)
3429 goto out;
3430 }
3431
3432#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3433 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
3434 status = nfsd4_encode_security_label(xdr, rqstp, context,
3435 contextlen);
3436 if (status)
3437 goto out;
3438 }
3439#endif
3440
3441 if (bmval2 & FATTR4_WORD2_XATTR_SUPPORT) {
3442 p = xdr_reserve_space(xdr, 4);
3443 if (!p)
3444 goto out_resource;
3445 err = xattr_supported_namespace(d_inode(dentry),
3446 XATTR_USER_PREFIX);
3447 *p++ = cpu_to_be32(err == 0);
3448 }
3449
3450 *attrlen_p = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3451 status = nfs_ok;
3452
3453out:
3454#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3455 if (context)
3456 security_release_secctx(context, contextlen);
3457#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3458 kfree(acl);
3459 if (tempfh) {
3460 fh_put(tempfh);
3461 kfree(tempfh);
3462 }
3463 if (status)
3464 xdr_truncate_encode(xdr, starting_len);
3465 return status;
3466out_nfserr:
3467 status = nfserrno(err);
3468 goto out;
3469out_resource:
3470 status = nfserr_resource;
3471 goto out;
3472}
3473
3474static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3475 struct xdr_buf *buf, __be32 *p, int bytes)
3476{
3477 xdr->scratch.iov_len = 0;
3478 memset(buf, 0, sizeof(struct xdr_buf));
3479 buf->head[0].iov_base = p;
3480 buf->head[0].iov_len = 0;
3481 buf->len = 0;
3482 xdr->buf = buf;
3483 xdr->iov = buf->head;
3484 xdr->p = p;
3485 xdr->end = (void *)p + bytes;
3486 buf->buflen = bytes;
3487}
3488
3489__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3490 struct svc_fh *fhp, struct svc_export *exp,
3491 struct dentry *dentry, u32 *bmval,
3492 struct svc_rqst *rqstp, int ignore_crossmnt)
3493{
3494 struct xdr_buf dummy;
3495 struct xdr_stream xdr;
3496 __be32 ret;
3497
3498 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3499 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
3500 ignore_crossmnt);
3501 *p = xdr.p;
3502 return ret;
3503}
3504
3505static inline int attributes_need_mount(u32 *bmval)
3506{
3507 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3508 return 1;
3509 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3510 return 1;
3511 return 0;
3512}
3513
3514static __be32
3515nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
3516 const char *name, int namlen)
3517{
3518 struct svc_export *exp = cd->rd_fhp->fh_export;
3519 struct dentry *dentry;
3520 __be32 nfserr;
3521 int ignore_crossmnt = 0;
3522
3523 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3524 if (IS_ERR(dentry))
3525 return nfserrno(PTR_ERR(dentry));
3526
3527 exp_get(exp);
3528 /*
3529 * In the case of a mountpoint, the client may be asking for
3530 * attributes that are only properties of the underlying filesystem
3531 * as opposed to the cross-mounted file system. In such a case,
3532 * we will not follow the cross mount and will fill the attribtutes
3533 * directly from the mountpoint dentry.
3534 */
3535 if (nfsd_mountpoint(dentry, exp)) {
3536 int err;
3537
3538 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3539 && !attributes_need_mount(cd->rd_bmval)) {
3540 ignore_crossmnt = 1;
3541 goto out_encode;
3542 }
3543 /*
3544 * Why the heck aren't we just using nfsd_lookup??
3545 * Different "."/".." handling? Something else?
3546 * At least, add a comment here to explain....
3547 */
3548 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3549 if (err) {
3550 nfserr = nfserrno(err);
3551 goto out_put;
3552 }
3553 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
3554 if (nfserr)
3555 goto out_put;
3556
3557 }
3558out_encode:
3559 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
3560 cd->rd_rqstp, ignore_crossmnt);
3561out_put:
3562 dput(dentry);
3563 exp_put(exp);
3564 return nfserr;
3565}
3566
3567static __be32 *
3568nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3569{
3570 __be32 *p;
3571
3572 p = xdr_reserve_space(xdr, 20);
3573 if (!p)
3574 return NULL;
3575 *p++ = htonl(2);
3576 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3577 *p++ = htonl(0); /* bmval1 */
3578
3579 *p++ = htonl(4); /* attribute length */
3580 *p++ = nfserr; /* no htonl */
3581 return p;
3582}
3583
3584static int
3585nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3586 loff_t offset, u64 ino, unsigned int d_type)
3587{
3588 struct readdir_cd *ccd = ccdv;
3589 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3590 struct xdr_stream *xdr = cd->xdr;
3591 int start_offset = xdr->buf->len;
3592 int cookie_offset;
3593 u32 name_and_cookie;
3594 int entry_bytes;
3595 __be32 nfserr = nfserr_toosmall;
3596 __be64 wire_offset;
3597 __be32 *p;
3598
3599 /* In nfsv4, "." and ".." never make it onto the wire.. */
3600 if (name && isdotent(name, namlen)) {
3601 cd->common.err = nfs_ok;
3602 return 0;
3603 }
3604
3605 if (cd->cookie_offset) {
3606 wire_offset = cpu_to_be64(offset);
3607 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3608 &wire_offset, 8);
3609 }
3610
3611 p = xdr_reserve_space(xdr, 4);
3612 if (!p)
3613 goto fail;
3614 *p++ = xdr_one; /* mark entry present */
3615 cookie_offset = xdr->buf->len;
3616 p = xdr_reserve_space(xdr, 3*4 + namlen);
3617 if (!p)
3618 goto fail;
3619 p = xdr_encode_hyper(p, OFFSET_MAX); /* offset of next entry */
3620 p = xdr_encode_array(p, name, namlen); /* name length & name */
3621
3622 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3623 switch (nfserr) {
3624 case nfs_ok:
3625 break;
3626 case nfserr_resource:
3627 nfserr = nfserr_toosmall;
3628 goto fail;
3629 case nfserr_noent:
3630 xdr_truncate_encode(xdr, start_offset);
3631 goto skip_entry;
3632 case nfserr_jukebox:
3633 /*
3634 * The pseudoroot should only display dentries that lead to
3635 * exports. If we get EJUKEBOX here, then we can't tell whether
3636 * this entry should be included. Just fail the whole READDIR
3637 * with NFS4ERR_DELAY in that case, and hope that the situation
3638 * will resolve itself by the client's next attempt.
3639 */
3640 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3641 goto fail;
3642 fallthrough;
3643 default:
3644 /*
3645 * If the client requested the RDATTR_ERROR attribute,
3646 * we stuff the error code into this attribute
3647 * and continue. If this attribute was not requested,
3648 * then in accordance with the spec, we fail the
3649 * entire READDIR operation(!)
3650 */
3651 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3652 goto fail;
3653 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3654 if (p == NULL) {
3655 nfserr = nfserr_toosmall;
3656 goto fail;
3657 }
3658 }
3659 nfserr = nfserr_toosmall;
3660 entry_bytes = xdr->buf->len - start_offset;
3661 if (entry_bytes > cd->rd_maxcount)
3662 goto fail;
3663 cd->rd_maxcount -= entry_bytes;
3664 /*
3665 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3666 * notes that it could be zero. If it is zero, then the server
3667 * should enforce only the rd_maxcount value.
3668 */
3669 if (cd->rd_dircount) {
3670 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3671 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3672 goto fail;
3673 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3674 if (!cd->rd_dircount)
3675 cd->rd_maxcount = 0;
3676 }
3677
3678 cd->cookie_offset = cookie_offset;
3679skip_entry:
3680 cd->common.err = nfs_ok;
3681 return 0;
3682fail:
3683 xdr_truncate_encode(xdr, start_offset);
3684 cd->common.err = nfserr;
3685 return -EINVAL;
3686}
3687
3688static __be32
3689nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3690{
3691 __be32 *p;
3692
3693 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3694 if (!p)
3695 return nfserr_resource;
3696 *p++ = cpu_to_be32(sid->si_generation);
3697 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3698 sizeof(stateid_opaque_t));
3699 return 0;
3700}
3701
3702static __be32
3703nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
3704 union nfsd4_op_u *u)
3705{
3706 struct nfsd4_access *access = &u->access;
3707 struct xdr_stream *xdr = resp->xdr;
3708 __be32 *p;
3709
3710 p = xdr_reserve_space(xdr, 8);
3711 if (!p)
3712 return nfserr_resource;
3713 *p++ = cpu_to_be32(access->ac_supported);
3714 *p++ = cpu_to_be32(access->ac_resp_access);
3715 return 0;
3716}
3717
3718static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3719 union nfsd4_op_u *u)
3720{
3721 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3722 struct xdr_stream *xdr = resp->xdr;
3723 __be32 *p;
3724
3725 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3726 if (!p)
3727 return nfserr_resource;
3728 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3729 NFS4_MAX_SESSIONID_LEN);
3730 *p++ = cpu_to_be32(bcts->dir);
3731 /* Upshifting from TCP to RDMA is not supported */
3732 *p++ = cpu_to_be32(0);
3733 return 0;
3734}
3735
3736static __be32
3737nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
3738 union nfsd4_op_u *u)
3739{
3740 struct nfsd4_close *close = &u->close;
3741 struct xdr_stream *xdr = resp->xdr;
3742
3743 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3744}
3745
3746
3747static __be32
3748nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
3749 union nfsd4_op_u *u)
3750{
3751 struct nfsd4_commit *commit = &u->commit;
3752 struct xdr_stream *xdr = resp->xdr;
3753 __be32 *p;
3754
3755 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3756 if (!p)
3757 return nfserr_resource;
3758 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3759 NFS4_VERIFIER_SIZE);
3760 return 0;
3761}
3762
3763static __be32
3764nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
3765 union nfsd4_op_u *u)
3766{
3767 struct nfsd4_create *create = &u->create;
3768 struct xdr_stream *xdr = resp->xdr;
3769 __be32 *p;
3770
3771 p = xdr_reserve_space(xdr, 20);
3772 if (!p)
3773 return nfserr_resource;
3774 encode_cinfo(p, &create->cr_cinfo);
3775 return nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3776 create->cr_bmval[1], create->cr_bmval[2]);
3777}
3778
3779static __be32
3780nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
3781 union nfsd4_op_u *u)
3782{
3783 struct nfsd4_getattr *getattr = &u->getattr;
3784 struct svc_fh *fhp = getattr->ga_fhp;
3785 struct xdr_stream *xdr = resp->xdr;
3786
3787 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3788 getattr->ga_bmval, resp->rqstp, 0);
3789}
3790
3791static __be32
3792nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
3793 union nfsd4_op_u *u)
3794{
3795 struct svc_fh **fhpp = &u->getfh;
3796 struct xdr_stream *xdr = resp->xdr;
3797 struct svc_fh *fhp = *fhpp;
3798 unsigned int len;
3799 __be32 *p;
3800
3801 len = fhp->fh_handle.fh_size;
3802 p = xdr_reserve_space(xdr, len + 4);
3803 if (!p)
3804 return nfserr_resource;
3805 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_raw, len);
3806 return 0;
3807}
3808
3809/*
3810* Including all fields other than the name, a LOCK4denied structure requires
3811* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3812*/
3813static __be32
3814nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3815{
3816 struct xdr_netobj *conf = &ld->ld_owner;
3817 __be32 *p;
3818
3819again:
3820 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3821 if (!p) {
3822 /*
3823 * Don't fail to return the result just because we can't
3824 * return the conflicting open:
3825 */
3826 if (conf->len) {
3827 kfree(conf->data);
3828 conf->len = 0;
3829 conf->data = NULL;
3830 goto again;
3831 }
3832 return nfserr_resource;
3833 }
3834 p = xdr_encode_hyper(p, ld->ld_start);
3835 p = xdr_encode_hyper(p, ld->ld_length);
3836 *p++ = cpu_to_be32(ld->ld_type);
3837 if (conf->len) {
3838 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3839 p = xdr_encode_opaque(p, conf->data, conf->len);
3840 kfree(conf->data);
3841 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3842 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3843 *p++ = cpu_to_be32(0); /* length of owner name */
3844 }
3845 return nfserr_denied;
3846}
3847
3848static __be32
3849nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
3850 union nfsd4_op_u *u)
3851{
3852 struct nfsd4_lock *lock = &u->lock;
3853 struct xdr_stream *xdr = resp->xdr;
3854
3855 if (!nfserr)
3856 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3857 else if (nfserr == nfserr_denied)
3858 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3859
3860 return nfserr;
3861}
3862
3863static __be32
3864nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
3865 union nfsd4_op_u *u)
3866{
3867 struct nfsd4_lockt *lockt = &u->lockt;
3868 struct xdr_stream *xdr = resp->xdr;
3869
3870 if (nfserr == nfserr_denied)
3871 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3872 return nfserr;
3873}
3874
3875static __be32
3876nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
3877 union nfsd4_op_u *u)
3878{
3879 struct nfsd4_locku *locku = &u->locku;
3880 struct xdr_stream *xdr = resp->xdr;
3881
3882 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3883}
3884
3885
3886static __be32
3887nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
3888 union nfsd4_op_u *u)
3889{
3890 struct nfsd4_link *link = &u->link;
3891 struct xdr_stream *xdr = resp->xdr;
3892 __be32 *p;
3893
3894 p = xdr_reserve_space(xdr, 20);
3895 if (!p)
3896 return nfserr_resource;
3897 p = encode_cinfo(p, &link->li_cinfo);
3898 return 0;
3899}
3900
3901
3902static __be32
3903nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
3904 union nfsd4_op_u *u)
3905{
3906 struct nfsd4_open *open = &u->open;
3907 struct xdr_stream *xdr = resp->xdr;
3908 __be32 *p;
3909
3910 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3911 if (nfserr)
3912 return nfserr;
3913 p = xdr_reserve_space(xdr, 24);
3914 if (!p)
3915 return nfserr_resource;
3916 p = encode_cinfo(p, &open->op_cinfo);
3917 *p++ = cpu_to_be32(open->op_rflags);
3918
3919 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3920 open->op_bmval[2]);
3921 if (nfserr)
3922 return nfserr;
3923
3924 p = xdr_reserve_space(xdr, 4);
3925 if (!p)
3926 return nfserr_resource;
3927
3928 *p++ = cpu_to_be32(open->op_delegate_type);
3929 switch (open->op_delegate_type) {
3930 case NFS4_OPEN_DELEGATE_NONE:
3931 break;
3932 case NFS4_OPEN_DELEGATE_READ:
3933 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3934 if (nfserr)
3935 return nfserr;
3936 p = xdr_reserve_space(xdr, 20);
3937 if (!p)
3938 return nfserr_resource;
3939 *p++ = cpu_to_be32(open->op_recall);
3940
3941 /*
3942 * TODO: ACE's in delegations
3943 */
3944 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3945 *p++ = cpu_to_be32(0);
3946 *p++ = cpu_to_be32(0);
3947 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3948 break;
3949 case NFS4_OPEN_DELEGATE_WRITE:
3950 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3951 if (nfserr)
3952 return nfserr;
3953 p = xdr_reserve_space(xdr, 32);
3954 if (!p)
3955 return nfserr_resource;
3956 *p++ = cpu_to_be32(0);
3957
3958 /*
3959 * TODO: space_limit's in delegations
3960 */
3961 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3962 *p++ = cpu_to_be32(~(u32)0);
3963 *p++ = cpu_to_be32(~(u32)0);
3964
3965 /*
3966 * TODO: ACE's in delegations
3967 */
3968 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3969 *p++ = cpu_to_be32(0);
3970 *p++ = cpu_to_be32(0);
3971 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3972 break;
3973 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3974 switch (open->op_why_no_deleg) {
3975 case WND4_CONTENTION:
3976 case WND4_RESOURCE:
3977 p = xdr_reserve_space(xdr, 8);
3978 if (!p)
3979 return nfserr_resource;
3980 *p++ = cpu_to_be32(open->op_why_no_deleg);
3981 /* deleg signaling not supported yet: */
3982 *p++ = cpu_to_be32(0);
3983 break;
3984 default:
3985 p = xdr_reserve_space(xdr, 4);
3986 if (!p)
3987 return nfserr_resource;
3988 *p++ = cpu_to_be32(open->op_why_no_deleg);
3989 }
3990 break;
3991 default:
3992 BUG();
3993 }
3994 /* XXX save filehandle here */
3995 return 0;
3996}
3997
3998static __be32
3999nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4000 union nfsd4_op_u *u)
4001{
4002 struct nfsd4_open_confirm *oc = &u->open_confirm;
4003 struct xdr_stream *xdr = resp->xdr;
4004
4005 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
4006}
4007
4008static __be32
4009nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4010 union nfsd4_op_u *u)
4011{
4012 struct nfsd4_open_downgrade *od = &u->open_downgrade;
4013 struct xdr_stream *xdr = resp->xdr;
4014
4015 return nfsd4_encode_stateid(xdr, &od->od_stateid);
4016}
4017
4018static __be32 nfsd4_encode_splice_read(
4019 struct nfsd4_compoundres *resp,
4020 struct nfsd4_read *read,
4021 struct file *file, unsigned long maxcount)
4022{
4023 struct xdr_stream *xdr = resp->xdr;
4024 struct xdr_buf *buf = xdr->buf;
4025 int status, space_left;
4026 __be32 nfserr;
4027
4028 /* Make sure there will be room for padding if needed */
4029 if (xdr->end - xdr->p < 1)
4030 return nfserr_resource;
4031
4032 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4033 file, read->rd_offset, &maxcount,
4034 &read->rd_eof);
4035 read->rd_length = maxcount;
4036 if (nfserr)
4037 goto out_err;
4038 status = svc_encode_result_payload(read->rd_rqstp,
4039 buf->head[0].iov_len, maxcount);
4040 if (status) {
4041 nfserr = nfserrno(status);
4042 goto out_err;
4043 }
4044
4045 buf->page_len = maxcount;
4046 buf->len += maxcount;
4047 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
4048 / PAGE_SIZE;
4049
4050 /* Use rest of head for padding and remaining ops: */
4051 buf->tail[0].iov_base = xdr->p;
4052 buf->tail[0].iov_len = 0;
4053 xdr->iov = buf->tail;
4054 if (maxcount&3) {
4055 int pad = 4 - (maxcount&3);
4056
4057 *(xdr->p++) = 0;
4058
4059 buf->tail[0].iov_base += maxcount&3;
4060 buf->tail[0].iov_len = pad;
4061 buf->len += pad;
4062 }
4063
4064 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4065 buf->buflen - buf->len);
4066 buf->buflen = buf->len + space_left;
4067 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4068
4069 return 0;
4070
4071out_err:
4072 /*
4073 * nfsd_splice_actor may have already messed with the
4074 * page length; reset it so as not to confuse
4075 * xdr_truncate_encode in our caller.
4076 */
4077 buf->page_len = 0;
4078 return nfserr;
4079}
4080
4081static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4082 struct nfsd4_read *read,
4083 struct file *file, unsigned long maxcount)
4084{
4085 struct xdr_stream *xdr = resp->xdr;
4086 unsigned int starting_len = xdr->buf->len;
4087 __be32 zero = xdr_zero;
4088 __be32 nfserr;
4089
4090 read->rd_vlen = xdr_reserve_space_vec(xdr, resp->rqstp->rq_vec, maxcount);
4091 if (read->rd_vlen < 0)
4092 return nfserr_resource;
4093
4094 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
4095 resp->rqstp->rq_vec, read->rd_vlen, &maxcount,
4096 &read->rd_eof);
4097 read->rd_length = maxcount;
4098 if (nfserr)
4099 return nfserr;
4100 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4101 return nfserr_io;
4102 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4103
4104 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4105 xdr_pad_size(maxcount));
4106 return nfs_ok;
4107}
4108
4109static __be32
4110nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4111 union nfsd4_op_u *u)
4112{
4113 struct nfsd4_read *read = &u->read;
4114 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4115 unsigned long maxcount;
4116 struct xdr_stream *xdr = resp->xdr;
4117 struct file *file;
4118 int starting_len = xdr->buf->len;
4119 __be32 *p;
4120
4121 if (nfserr)
4122 return nfserr;
4123 file = read->rd_nf->nf_file;
4124
4125 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
4126 if (!p) {
4127 WARN_ON_ONCE(splice_ok);
4128 return nfserr_resource;
4129 }
4130 if (resp->xdr->buf->page_len && splice_ok) {
4131 WARN_ON_ONCE(1);
4132 return nfserr_serverfault;
4133 }
4134 xdr_commit_encode(xdr);
4135
4136 maxcount = min_t(unsigned long, read->rd_length,
4137 (xdr->buf->buflen - xdr->buf->len));
4138
4139 if (file->f_op->splice_read && splice_ok)
4140 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4141 else
4142 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4143 if (nfserr) {
4144 xdr_truncate_encode(xdr, starting_len);
4145 return nfserr;
4146 }
4147
4148 p = xdr_encode_bool(p, read->rd_eof);
4149 *p = cpu_to_be32(read->rd_length);
4150 return nfs_ok;
4151}
4152
4153static __be32
4154nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4155 union nfsd4_op_u *u)
4156{
4157 struct nfsd4_readlink *readlink = &u->readlink;
4158 __be32 *p, *maxcount_p, zero = xdr_zero;
4159 struct xdr_stream *xdr = resp->xdr;
4160 int length_offset = xdr->buf->len;
4161 int maxcount, status;
4162
4163 maxcount_p = xdr_reserve_space(xdr, XDR_UNIT);
4164 if (!maxcount_p)
4165 return nfserr_resource;
4166 maxcount = PAGE_SIZE;
4167
4168 p = xdr_reserve_space(xdr, maxcount);
4169 if (!p)
4170 return nfserr_resource;
4171 /*
4172 * XXX: By default, vfs_readlink() will truncate symlinks if they
4173 * would overflow the buffer. Is this kosher in NFSv4? If not, one
4174 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
4175 * that truncation occurred, and return NFS4ERR_RESOURCE.
4176 */
4177 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4178 (char *)p, &maxcount);
4179 if (nfserr == nfserr_isdir)
4180 nfserr = nfserr_inval;
4181 if (nfserr)
4182 goto out_err;
4183 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4184 maxcount);
4185 if (status) {
4186 nfserr = nfserrno(status);
4187 goto out_err;
4188 }
4189 *maxcount_p = cpu_to_be32(maxcount);
4190 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4191 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4192 xdr_pad_size(maxcount));
4193 return nfs_ok;
4194
4195out_err:
4196 xdr_truncate_encode(xdr, length_offset);
4197 return nfserr;
4198}
4199
4200static __be32
4201nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4202 union nfsd4_op_u *u)
4203{
4204 struct nfsd4_readdir *readdir = &u->readdir;
4205 int maxcount;
4206 int bytes_left;
4207 loff_t offset;
4208 __be64 wire_offset;
4209 struct xdr_stream *xdr = resp->xdr;
4210 int starting_len = xdr->buf->len;
4211 __be32 *p;
4212
4213 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
4214 if (!p)
4215 return nfserr_resource;
4216
4217 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
4218 *p++ = cpu_to_be32(0);
4219 *p++ = cpu_to_be32(0);
4220 xdr->buf->head[0].iov_len = (char *)xdr->p -
4221 (char *)xdr->buf->head[0].iov_base;
4222
4223 /*
4224 * Number of bytes left for directory entries allowing for the
4225 * final 8 bytes of the readdir and a following failed op:
4226 */
4227 bytes_left = xdr->buf->buflen - xdr->buf->len
4228 - COMPOUND_ERR_SLACK_SPACE - 8;
4229 if (bytes_left < 0) {
4230 nfserr = nfserr_resource;
4231 goto err_no_verf;
4232 }
4233 maxcount = svc_max_payload(resp->rqstp);
4234 maxcount = min_t(u32, readdir->rd_maxcount, maxcount);
4235 /*
4236 * Note the rfc defines rd_maxcount as the size of the
4237 * READDIR4resok structure, which includes the verifier above
4238 * and the 8 bytes encoded at the end of this function:
4239 */
4240 if (maxcount < 16) {
4241 nfserr = nfserr_toosmall;
4242 goto err_no_verf;
4243 }
4244 maxcount = min_t(int, maxcount-16, bytes_left);
4245
4246 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
4247 if (!readdir->rd_dircount)
4248 readdir->rd_dircount = svc_max_payload(resp->rqstp);
4249
4250 readdir->xdr = xdr;
4251 readdir->rd_maxcount = maxcount;
4252 readdir->common.err = 0;
4253 readdir->cookie_offset = 0;
4254
4255 offset = readdir->rd_cookie;
4256 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
4257 &offset,
4258 &readdir->common, nfsd4_encode_dirent);
4259 if (nfserr == nfs_ok &&
4260 readdir->common.err == nfserr_toosmall &&
4261 xdr->buf->len == starting_len + 8) {
4262 /* nothing encoded; which limit did we hit?: */
4263 if (maxcount - 16 < bytes_left)
4264 /* It was the fault of rd_maxcount: */
4265 nfserr = nfserr_toosmall;
4266 else
4267 /* We ran out of buffer space: */
4268 nfserr = nfserr_resource;
4269 }
4270 if (nfserr)
4271 goto err_no_verf;
4272
4273 if (readdir->cookie_offset) {
4274 wire_offset = cpu_to_be64(offset);
4275 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
4276 &wire_offset, 8);
4277 }
4278
4279 p = xdr_reserve_space(xdr, 8);
4280 if (!p) {
4281 WARN_ON_ONCE(1);
4282 goto err_no_verf;
4283 }
4284 *p++ = 0; /* no more entries */
4285 *p++ = htonl(readdir->common.err == nfserr_eof);
4286
4287 return 0;
4288err_no_verf:
4289 xdr_truncate_encode(xdr, starting_len);
4290 return nfserr;
4291}
4292
4293static __be32
4294nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4295 union nfsd4_op_u *u)
4296{
4297 struct nfsd4_remove *remove = &u->remove;
4298 struct xdr_stream *xdr = resp->xdr;
4299 __be32 *p;
4300
4301 p = xdr_reserve_space(xdr, 20);
4302 if (!p)
4303 return nfserr_resource;
4304 p = encode_cinfo(p, &remove->rm_cinfo);
4305 return 0;
4306}
4307
4308static __be32
4309nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4310 union nfsd4_op_u *u)
4311{
4312 struct nfsd4_rename *rename = &u->rename;
4313 struct xdr_stream *xdr = resp->xdr;
4314 __be32 *p;
4315
4316 p = xdr_reserve_space(xdr, 40);
4317 if (!p)
4318 return nfserr_resource;
4319 p = encode_cinfo(p, &rename->rn_sinfo);
4320 p = encode_cinfo(p, &rename->rn_tinfo);
4321 return 0;
4322}
4323
4324static __be32
4325nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
4326{
4327 u32 i, nflavs, supported;
4328 struct exp_flavor_info *flavs;
4329 struct exp_flavor_info def_flavs[2];
4330 __be32 *p, *flavorsp;
4331 static bool report = true;
4332
4333 if (exp->ex_nflavors) {
4334 flavs = exp->ex_flavors;
4335 nflavs = exp->ex_nflavors;
4336 } else { /* Handling of some defaults in absence of real secinfo: */
4337 flavs = def_flavs;
4338 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4339 nflavs = 2;
4340 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4341 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4342 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4343 nflavs = 1;
4344 flavs[0].pseudoflavor
4345 = svcauth_gss_flavor(exp->ex_client);
4346 } else {
4347 nflavs = 1;
4348 flavs[0].pseudoflavor
4349 = exp->ex_client->flavour->flavour;
4350 }
4351 }
4352
4353 supported = 0;
4354 p = xdr_reserve_space(xdr, 4);
4355 if (!p)
4356 return nfserr_resource;
4357 flavorsp = p++; /* to be backfilled later */
4358
4359 for (i = 0; i < nflavs; i++) {
4360 rpc_authflavor_t pf = flavs[i].pseudoflavor;
4361 struct rpcsec_gss_info info;
4362
4363 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4364 supported++;
4365 p = xdr_reserve_space(xdr, 4 + 4 +
4366 XDR_LEN(info.oid.len) + 4 + 4);
4367 if (!p)
4368 return nfserr_resource;
4369 *p++ = cpu_to_be32(RPC_AUTH_GSS);
4370 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
4371 *p++ = cpu_to_be32(info.qop);
4372 *p++ = cpu_to_be32(info.service);
4373 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4374 supported++;
4375 p = xdr_reserve_space(xdr, 4);
4376 if (!p)
4377 return nfserr_resource;
4378 *p++ = cpu_to_be32(pf);
4379 } else {
4380 if (report)
4381 pr_warn("NFS: SECINFO: security flavor %u "
4382 "is not supported\n", pf);
4383 }
4384 }
4385
4386 if (nflavs != supported)
4387 report = false;
4388 *flavorsp = htonl(supported);
4389 return 0;
4390}
4391
4392static __be32
4393nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4394 union nfsd4_op_u *u)
4395{
4396 struct nfsd4_secinfo *secinfo = &u->secinfo;
4397 struct xdr_stream *xdr = resp->xdr;
4398
4399 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
4400}
4401
4402static __be32
4403nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4404 union nfsd4_op_u *u)
4405{
4406 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4407 struct xdr_stream *xdr = resp->xdr;
4408
4409 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
4410}
4411
4412/*
4413 * The SETATTR encode routine is special -- it always encodes a bitmap,
4414 * regardless of the error status.
4415 */
4416static __be32
4417nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4418 union nfsd4_op_u *u)
4419{
4420 struct nfsd4_setattr *setattr = &u->setattr;
4421 struct xdr_stream *xdr = resp->xdr;
4422 __be32 *p;
4423
4424 p = xdr_reserve_space(xdr, 16);
4425 if (!p)
4426 return nfserr_resource;
4427 if (nfserr) {
4428 *p++ = cpu_to_be32(3);
4429 *p++ = cpu_to_be32(0);
4430 *p++ = cpu_to_be32(0);
4431 *p++ = cpu_to_be32(0);
4432 }
4433 else {
4434 *p++ = cpu_to_be32(3);
4435 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
4436 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
4437 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
4438 }
4439 return nfserr;
4440}
4441
4442static __be32
4443nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4444 union nfsd4_op_u *u)
4445{
4446 struct nfsd4_setclientid *scd = &u->setclientid;
4447 struct xdr_stream *xdr = resp->xdr;
4448 __be32 *p;
4449
4450 if (!nfserr) {
4451 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
4452 if (!p)
4453 return nfserr_resource;
4454 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
4455 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
4456 NFS4_VERIFIER_SIZE);
4457 }
4458 else if (nfserr == nfserr_clid_inuse) {
4459 p = xdr_reserve_space(xdr, 8);
4460 if (!p)
4461 return nfserr_resource;
4462 *p++ = cpu_to_be32(0);
4463 *p++ = cpu_to_be32(0);
4464 }
4465 return nfserr;
4466}
4467
4468static __be32
4469nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4470 union nfsd4_op_u *u)
4471{
4472 struct nfsd4_write *write = &u->write;
4473 struct xdr_stream *xdr = resp->xdr;
4474 __be32 *p;
4475
4476 p = xdr_reserve_space(xdr, 16);
4477 if (!p)
4478 return nfserr_resource;
4479 *p++ = cpu_to_be32(write->wr_bytes_written);
4480 *p++ = cpu_to_be32(write->wr_how_written);
4481 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4482 NFS4_VERIFIER_SIZE);
4483 return 0;
4484}
4485
4486static __be32
4487nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4488 union nfsd4_op_u *u)
4489{
4490 struct nfsd4_exchange_id *exid = &u->exchange_id;
4491 struct xdr_stream *xdr = resp->xdr;
4492 __be32 *p;
4493 char *major_id;
4494 char *server_scope;
4495 int major_id_sz;
4496 int server_scope_sz;
4497 uint64_t minor_id = 0;
4498 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4499
4500 major_id = nn->nfsd_name;
4501 major_id_sz = strlen(nn->nfsd_name);
4502 server_scope = nn->nfsd_name;
4503 server_scope_sz = strlen(nn->nfsd_name);
4504
4505 p = xdr_reserve_space(xdr,
4506 8 /* eir_clientid */ +
4507 4 /* eir_sequenceid */ +
4508 4 /* eir_flags */ +
4509 4 /* spr_how */);
4510 if (!p)
4511 return nfserr_resource;
4512
4513 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
4514 *p++ = cpu_to_be32(exid->seqid);
4515 *p++ = cpu_to_be32(exid->flags);
4516
4517 *p++ = cpu_to_be32(exid->spa_how);
4518
4519 switch (exid->spa_how) {
4520 case SP4_NONE:
4521 break;
4522 case SP4_MACH_CRED:
4523 /* spo_must_enforce bitmap: */
4524 nfserr = nfsd4_encode_bitmap(xdr,
4525 exid->spo_must_enforce[0],
4526 exid->spo_must_enforce[1],
4527 exid->spo_must_enforce[2]);
4528 if (nfserr)
4529 return nfserr;
4530 /* spo_must_allow bitmap: */
4531 nfserr = nfsd4_encode_bitmap(xdr,
4532 exid->spo_must_allow[0],
4533 exid->spo_must_allow[1],
4534 exid->spo_must_allow[2]);
4535 if (nfserr)
4536 return nfserr;
4537 break;
4538 default:
4539 WARN_ON_ONCE(1);
4540 }
4541
4542 p = xdr_reserve_space(xdr,
4543 8 /* so_minor_id */ +
4544 4 /* so_major_id.len */ +
4545 (XDR_QUADLEN(major_id_sz) * 4) +
4546 4 /* eir_server_scope.len */ +
4547 (XDR_QUADLEN(server_scope_sz) * 4) +
4548 4 /* eir_server_impl_id.count (0) */);
4549 if (!p)
4550 return nfserr_resource;
4551
4552 /* The server_owner struct */
4553 p = xdr_encode_hyper(p, minor_id); /* Minor id */
4554 /* major id */
4555 p = xdr_encode_opaque(p, major_id, major_id_sz);
4556
4557 /* Server scope */
4558 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
4559
4560 /* Implementation id */
4561 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
4562 return 0;
4563}
4564
4565static __be32
4566nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4567 union nfsd4_op_u *u)
4568{
4569 struct nfsd4_create_session *sess = &u->create_session;
4570 struct xdr_stream *xdr = resp->xdr;
4571 __be32 *p;
4572
4573 p = xdr_reserve_space(xdr, 24);
4574 if (!p)
4575 return nfserr_resource;
4576 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
4577 NFS4_MAX_SESSIONID_LEN);
4578 *p++ = cpu_to_be32(sess->seqid);
4579 *p++ = cpu_to_be32(sess->flags);
4580
4581 p = xdr_reserve_space(xdr, 28);
4582 if (!p)
4583 return nfserr_resource;
4584 *p++ = cpu_to_be32(0); /* headerpadsz */
4585 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
4586 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
4587 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
4588 *p++ = cpu_to_be32(sess->fore_channel.maxops);
4589 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
4590 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
4591
4592 if (sess->fore_channel.nr_rdma_attrs) {
4593 p = xdr_reserve_space(xdr, 4);
4594 if (!p)
4595 return nfserr_resource;
4596 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4597 }
4598
4599 p = xdr_reserve_space(xdr, 28);
4600 if (!p)
4601 return nfserr_resource;
4602 *p++ = cpu_to_be32(0); /* headerpadsz */
4603 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4604 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4605 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4606 *p++ = cpu_to_be32(sess->back_channel.maxops);
4607 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4608 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4609
4610 if (sess->back_channel.nr_rdma_attrs) {
4611 p = xdr_reserve_space(xdr, 4);
4612 if (!p)
4613 return nfserr_resource;
4614 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4615 }
4616 return 0;
4617}
4618
4619static __be32
4620nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4621 union nfsd4_op_u *u)
4622{
4623 struct nfsd4_sequence *seq = &u->sequence;
4624 struct xdr_stream *xdr = resp->xdr;
4625 __be32 *p;
4626
4627 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4628 if (!p)
4629 return nfserr_resource;
4630 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4631 NFS4_MAX_SESSIONID_LEN);
4632 *p++ = cpu_to_be32(seq->seqid);
4633 *p++ = cpu_to_be32(seq->slotid);
4634 /* Note slotid's are numbered from zero: */
4635 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4636 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4637 *p++ = cpu_to_be32(seq->status_flags);
4638
4639 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4640 return 0;
4641}
4642
4643static __be32
4644nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4645 union nfsd4_op_u *u)
4646{
4647 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
4648 struct xdr_stream *xdr = resp->xdr;
4649 struct nfsd4_test_stateid_id *stateid, *next;
4650 __be32 *p;
4651
4652 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4653 if (!p)
4654 return nfserr_resource;
4655 *p++ = htonl(test_stateid->ts_num_ids);
4656
4657 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4658 *p++ = stateid->ts_id_status;
4659 }
4660
4661 return 0;
4662}
4663
4664#ifdef CONFIG_NFSD_PNFS
4665static __be32
4666nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4667 union nfsd4_op_u *u)
4668{
4669 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
4670 struct xdr_stream *xdr = resp->xdr;
4671 const struct nfsd4_layout_ops *ops;
4672 u32 starting_len = xdr->buf->len, needed_len;
4673 __be32 *p;
4674
4675 p = xdr_reserve_space(xdr, 4);
4676 if (!p)
4677 return nfserr_resource;
4678
4679 *p++ = cpu_to_be32(gdev->gd_layout_type);
4680
4681 /* If maxcount is 0 then just update notifications */
4682 if (gdev->gd_maxcount != 0) {
4683 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4684 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4685 if (nfserr) {
4686 /*
4687 * We don't bother to burden the layout drivers with
4688 * enforcing gd_maxcount, just tell the client to
4689 * come back with a bigger buffer if it's not enough.
4690 */
4691 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4692 goto toosmall;
4693 return nfserr;
4694 }
4695 }
4696
4697 if (gdev->gd_notify_types) {
4698 p = xdr_reserve_space(xdr, 4 + 4);
4699 if (!p)
4700 return nfserr_resource;
4701 *p++ = cpu_to_be32(1); /* bitmap length */
4702 *p++ = cpu_to_be32(gdev->gd_notify_types);
4703 } else {
4704 p = xdr_reserve_space(xdr, 4);
4705 if (!p)
4706 return nfserr_resource;
4707 *p++ = 0;
4708 }
4709
4710 return 0;
4711toosmall:
4712 dprintk("%s: maxcount too small\n", __func__);
4713 needed_len = xdr->buf->len + 4 /* notifications */;
4714 xdr_truncate_encode(xdr, starting_len);
4715 p = xdr_reserve_space(xdr, 4);
4716 if (!p)
4717 return nfserr_resource;
4718 *p++ = cpu_to_be32(needed_len);
4719 return nfserr_toosmall;
4720}
4721
4722static __be32
4723nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4724 union nfsd4_op_u *u)
4725{
4726 struct nfsd4_layoutget *lgp = &u->layoutget;
4727 struct xdr_stream *xdr = resp->xdr;
4728 const struct nfsd4_layout_ops *ops;
4729 __be32 *p;
4730
4731 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4732 if (!p)
4733 return nfserr_resource;
4734
4735 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4736 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4737 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4738 sizeof(stateid_opaque_t));
4739
4740 *p++ = cpu_to_be32(1); /* we always return a single layout */
4741 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4742 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4743 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4744 *p++ = cpu_to_be32(lgp->lg_layout_type);
4745
4746 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4747 return ops->encode_layoutget(xdr, lgp);
4748}
4749
4750static __be32
4751nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4752 union nfsd4_op_u *u)
4753{
4754 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
4755 struct xdr_stream *xdr = resp->xdr;
4756 __be32 *p;
4757
4758 p = xdr_reserve_space(xdr, 4);
4759 if (!p)
4760 return nfserr_resource;
4761 *p++ = cpu_to_be32(lcp->lc_size_chg);
4762 if (lcp->lc_size_chg) {
4763 p = xdr_reserve_space(xdr, 8);
4764 if (!p)
4765 return nfserr_resource;
4766 p = xdr_encode_hyper(p, lcp->lc_newsize);
4767 }
4768
4769 return 0;
4770}
4771
4772static __be32
4773nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4774 union nfsd4_op_u *u)
4775{
4776 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
4777 struct xdr_stream *xdr = resp->xdr;
4778 __be32 *p;
4779
4780 p = xdr_reserve_space(xdr, 4);
4781 if (!p)
4782 return nfserr_resource;
4783 *p++ = cpu_to_be32(lrp->lrs_present);
4784 if (lrp->lrs_present)
4785 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4786 return 0;
4787}
4788#endif /* CONFIG_NFSD_PNFS */
4789
4790static __be32
4791nfsd42_encode_write_res(struct nfsd4_compoundres *resp,
4792 struct nfsd42_write_res *write, bool sync)
4793{
4794 __be32 *p;
4795 p = xdr_reserve_space(resp->xdr, 4);
4796 if (!p)
4797 return nfserr_resource;
4798
4799 if (sync)
4800 *p++ = cpu_to_be32(0);
4801 else {
4802 __be32 nfserr;
4803 *p++ = cpu_to_be32(1);
4804 nfserr = nfsd4_encode_stateid(resp->xdr, &write->cb_stateid);
4805 if (nfserr)
4806 return nfserr;
4807 }
4808 p = xdr_reserve_space(resp->xdr, 8 + 4 + NFS4_VERIFIER_SIZE);
4809 if (!p)
4810 return nfserr_resource;
4811
4812 p = xdr_encode_hyper(p, write->wr_bytes_written);
4813 *p++ = cpu_to_be32(write->wr_stable_how);
4814 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4815 NFS4_VERIFIER_SIZE);
4816 return nfs_ok;
4817}
4818
4819static __be32
4820nfsd42_encode_nl4_server(struct nfsd4_compoundres *resp, struct nl4_server *ns)
4821{
4822 struct xdr_stream *xdr = resp->xdr;
4823 struct nfs42_netaddr *addr;
4824 __be32 *p;
4825
4826 p = xdr_reserve_space(xdr, 4);
4827 *p++ = cpu_to_be32(ns->nl4_type);
4828
4829 switch (ns->nl4_type) {
4830 case NL4_NETADDR:
4831 addr = &ns->u.nl4_addr;
4832
4833 /* netid_len, netid, uaddr_len, uaddr (port included
4834 * in RPCBIND_MAXUADDRLEN)
4835 */
4836 p = xdr_reserve_space(xdr,
4837 4 /* netid len */ +
4838 (XDR_QUADLEN(addr->netid_len) * 4) +
4839 4 /* uaddr len */ +
4840 (XDR_QUADLEN(addr->addr_len) * 4));
4841 if (!p)
4842 return nfserr_resource;
4843
4844 *p++ = cpu_to_be32(addr->netid_len);
4845 p = xdr_encode_opaque_fixed(p, addr->netid,
4846 addr->netid_len);
4847 *p++ = cpu_to_be32(addr->addr_len);
4848 p = xdr_encode_opaque_fixed(p, addr->addr,
4849 addr->addr_len);
4850 break;
4851 default:
4852 WARN_ON_ONCE(ns->nl4_type != NL4_NETADDR);
4853 return nfserr_inval;
4854 }
4855
4856 return 0;
4857}
4858
4859static __be32
4860nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4861 union nfsd4_op_u *u)
4862{
4863 struct nfsd4_copy *copy = &u->copy;
4864 __be32 *p;
4865
4866 nfserr = nfsd42_encode_write_res(resp, ©->cp_res,
4867 nfsd4_copy_is_sync(copy));
4868 if (nfserr)
4869 return nfserr;
4870
4871 p = xdr_reserve_space(resp->xdr, 4 + 4);
4872 *p++ = xdr_one; /* cr_consecutive */
4873 *p = nfsd4_copy_is_sync(copy) ? xdr_one : xdr_zero;
4874 return 0;
4875}
4876
4877static __be32
4878nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
4879 union nfsd4_op_u *u)
4880{
4881 struct nfsd4_offload_status *os = &u->offload_status;
4882 struct xdr_stream *xdr = resp->xdr;
4883 __be32 *p;
4884
4885 p = xdr_reserve_space(xdr, 8 + 4);
4886 if (!p)
4887 return nfserr_resource;
4888 p = xdr_encode_hyper(p, os->count);
4889 *p++ = cpu_to_be32(0);
4890 return nfserr;
4891}
4892
4893static __be32
4894nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
4895 struct nfsd4_read *read)
4896{
4897 bool splice_ok = test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags);
4898 struct file *file = read->rd_nf->nf_file;
4899 struct xdr_stream *xdr = resp->xdr;
4900 unsigned long maxcount;
4901 __be32 nfserr, *p;
4902
4903 /* Content type, offset, byte count */
4904 p = xdr_reserve_space(xdr, 4 + 8 + 4);
4905 if (!p)
4906 return nfserr_io;
4907 if (resp->xdr->buf->page_len && splice_ok) {
4908 WARN_ON_ONCE(splice_ok);
4909 return nfserr_serverfault;
4910 }
4911
4912 maxcount = min_t(unsigned long, read->rd_length,
4913 (xdr->buf->buflen - xdr->buf->len));
4914
4915 if (file->f_op->splice_read && splice_ok)
4916 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4917 else
4918 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4919 if (nfserr)
4920 return nfserr;
4921
4922 *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
4923 p = xdr_encode_hyper(p, read->rd_offset);
4924 *p = cpu_to_be32(read->rd_length);
4925
4926 return nfs_ok;
4927}
4928
4929static __be32
4930nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
4931 union nfsd4_op_u *u)
4932{
4933 struct nfsd4_read *read = &u->read;
4934 struct file *file = read->rd_nf->nf_file;
4935 struct xdr_stream *xdr = resp->xdr;
4936 int starting_len = xdr->buf->len;
4937 u32 segments = 0;
4938 __be32 *p;
4939
4940 if (nfserr)
4941 return nfserr;
4942
4943 /* eof flag, segment count */
4944 p = xdr_reserve_space(xdr, 4 + 4);
4945 if (!p)
4946 return nfserr_io;
4947 xdr_commit_encode(xdr);
4948
4949 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
4950 if (read->rd_eof)
4951 goto out;
4952
4953 nfserr = nfsd4_encode_read_plus_data(resp, read);
4954 if (nfserr) {
4955 xdr_truncate_encode(xdr, starting_len);
4956 return nfserr;
4957 }
4958
4959 segments++;
4960
4961out:
4962 p = xdr_encode_bool(p, read->rd_eof);
4963 *p = cpu_to_be32(segments);
4964 return nfserr;
4965}
4966
4967static __be32
4968nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
4969 union nfsd4_op_u *u)
4970{
4971 struct nfsd4_copy_notify *cn = &u->copy_notify;
4972 struct xdr_stream *xdr = resp->xdr;
4973 __be32 *p;
4974
4975 if (nfserr)
4976 return nfserr;
4977
4978 /* 8 sec, 4 nsec */
4979 p = xdr_reserve_space(xdr, 12);
4980 if (!p)
4981 return nfserr_resource;
4982
4983 /* cnr_lease_time */
4984 p = xdr_encode_hyper(p, cn->cpn_sec);
4985 *p++ = cpu_to_be32(cn->cpn_nsec);
4986
4987 /* cnr_stateid */
4988 nfserr = nfsd4_encode_stateid(xdr, &cn->cpn_cnr_stateid);
4989 if (nfserr)
4990 return nfserr;
4991
4992 /* cnr_src.nl_nsvr */
4993 p = xdr_reserve_space(xdr, 4);
4994 if (!p)
4995 return nfserr_resource;
4996
4997 *p++ = cpu_to_be32(1);
4998
4999 nfserr = nfsd42_encode_nl4_server(resp, cn->cpn_src);
5000 return nfserr;
5001}
5002
5003static __be32
5004nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5005 union nfsd4_op_u *u)
5006{
5007 struct nfsd4_seek *seek = &u->seek;
5008 __be32 *p;
5009
5010 p = xdr_reserve_space(resp->xdr, 4 + 8);
5011 *p++ = cpu_to_be32(seek->seek_eof);
5012 p = xdr_encode_hyper(p, seek->seek_pos);
5013
5014 return 0;
5015}
5016
5017static __be32
5018nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5019 union nfsd4_op_u *p)
5020{
5021 return nfserr;
5022}
5023
5024/*
5025 * Encode kmalloc-ed buffer in to XDR stream.
5026 */
5027static __be32
5028nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5029{
5030 u32 cplen;
5031 __be32 *p;
5032
5033 cplen = min_t(unsigned long, buflen,
5034 ((void *)xdr->end - (void *)xdr->p));
5035 p = xdr_reserve_space(xdr, cplen);
5036 if (!p)
5037 return nfserr_resource;
5038
5039 memcpy(p, buf, cplen);
5040 buf += cplen;
5041 buflen -= cplen;
5042
5043 while (buflen) {
5044 cplen = min_t(u32, buflen, PAGE_SIZE);
5045 p = xdr_reserve_space(xdr, cplen);
5046 if (!p)
5047 return nfserr_resource;
5048
5049 memcpy(p, buf, cplen);
5050
5051 if (cplen < PAGE_SIZE) {
5052 /*
5053 * We're done, with a length that wasn't page
5054 * aligned, so possibly not word aligned. Pad
5055 * any trailing bytes with 0.
5056 */
5057 xdr_encode_opaque_fixed(p, NULL, cplen);
5058 break;
5059 }
5060
5061 buflen -= PAGE_SIZE;
5062 buf += PAGE_SIZE;
5063 }
5064
5065 return 0;
5066}
5067
5068static __be32
5069nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5070 union nfsd4_op_u *u)
5071{
5072 struct nfsd4_getxattr *getxattr = &u->getxattr;
5073 struct xdr_stream *xdr = resp->xdr;
5074 __be32 *p, err;
5075
5076 p = xdr_reserve_space(xdr, 4);
5077 if (!p)
5078 return nfserr_resource;
5079
5080 *p = cpu_to_be32(getxattr->getxa_len);
5081
5082 if (getxattr->getxa_len == 0)
5083 return 0;
5084
5085 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5086 getxattr->getxa_len);
5087
5088 kvfree(getxattr->getxa_buf);
5089
5090 return err;
5091}
5092
5093static __be32
5094nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5095 union nfsd4_op_u *u)
5096{
5097 struct nfsd4_setxattr *setxattr = &u->setxattr;
5098 struct xdr_stream *xdr = resp->xdr;
5099 __be32 *p;
5100
5101 p = xdr_reserve_space(xdr, 20);
5102 if (!p)
5103 return nfserr_resource;
5104
5105 encode_cinfo(p, &setxattr->setxa_cinfo);
5106
5107 return 0;
5108}
5109
5110/*
5111 * See if there are cookie values that can be rejected outright.
5112 */
5113static __be32
5114nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5115 u32 *offsetp)
5116{
5117 u64 cookie = listxattrs->lsxa_cookie;
5118
5119 /*
5120 * If the cookie is larger than the maximum number we can fit
5121 * in either the buffer we just got back from vfs_listxattr, or,
5122 * XDR-encoded, in the return buffer, it's invalid.
5123 */
5124 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5125 return nfserr_badcookie;
5126
5127 if (cookie > (listxattrs->lsxa_maxcount /
5128 (XDR_QUADLEN(XATTR_USER_PREFIX_LEN + 2) + 4)))
5129 return nfserr_badcookie;
5130
5131 *offsetp = (u32)cookie;
5132 return 0;
5133}
5134
5135static __be32
5136nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5137 union nfsd4_op_u *u)
5138{
5139 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5140 struct xdr_stream *xdr = resp->xdr;
5141 u32 cookie_offset, count_offset, eof;
5142 u32 left, xdrleft, slen, count;
5143 u32 xdrlen, offset;
5144 u64 cookie;
5145 char *sp;
5146 __be32 status, tmp;
5147 __be32 *p;
5148 u32 nuser;
5149
5150 eof = 1;
5151
5152 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5153 if (status)
5154 goto out;
5155
5156 /*
5157 * Reserve space for the cookie and the name array count. Record
5158 * the offsets to save them later.
5159 */
5160 cookie_offset = xdr->buf->len;
5161 count_offset = cookie_offset + 8;
5162 p = xdr_reserve_space(xdr, 12);
5163 if (!p) {
5164 status = nfserr_resource;
5165 goto out;
5166 }
5167
5168 count = 0;
5169 left = listxattrs->lsxa_len;
5170 sp = listxattrs->lsxa_buf;
5171 nuser = 0;
5172
5173 xdrleft = listxattrs->lsxa_maxcount;
5174
5175 while (left > 0 && xdrleft > 0) {
5176 slen = strlen(sp);
5177
5178 /*
5179 * Check if this is a "user." attribute, skip it if not.
5180 */
5181 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5182 goto contloop;
5183
5184 slen -= XATTR_USER_PREFIX_LEN;
5185 xdrlen = 4 + ((slen + 3) & ~3);
5186 if (xdrlen > xdrleft) {
5187 if (count == 0) {
5188 /*
5189 * Can't even fit the first attribute name.
5190 */
5191 status = nfserr_toosmall;
5192 goto out;
5193 }
5194 eof = 0;
5195 goto wreof;
5196 }
5197
5198 left -= XATTR_USER_PREFIX_LEN;
5199 sp += XATTR_USER_PREFIX_LEN;
5200 if (nuser++ < offset)
5201 goto contloop;
5202
5203
5204 p = xdr_reserve_space(xdr, xdrlen);
5205 if (!p) {
5206 status = nfserr_resource;
5207 goto out;
5208 }
5209
5210 xdr_encode_opaque(p, sp, slen);
5211
5212 xdrleft -= xdrlen;
5213 count++;
5214contloop:
5215 sp += slen + 1;
5216 left -= slen + 1;
5217 }
5218
5219 /*
5220 * If there were user attributes to copy, but we didn't copy
5221 * any, the offset was too large (e.g. the cookie was invalid).
5222 */
5223 if (nuser > 0 && count == 0) {
5224 status = nfserr_badcookie;
5225 goto out;
5226 }
5227
5228wreof:
5229 p = xdr_reserve_space(xdr, 4);
5230 if (!p) {
5231 status = nfserr_resource;
5232 goto out;
5233 }
5234 *p = cpu_to_be32(eof);
5235
5236 cookie = offset + count;
5237
5238 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &cookie, 8);
5239 tmp = cpu_to_be32(count);
5240 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5241out:
5242 if (listxattrs->lsxa_len)
5243 kvfree(listxattrs->lsxa_buf);
5244 return status;
5245}
5246
5247static __be32
5248nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5249 union nfsd4_op_u *u)
5250{
5251 struct nfsd4_removexattr *removexattr = &u->removexattr;
5252 struct xdr_stream *xdr = resp->xdr;
5253 __be32 *p;
5254
5255 p = xdr_reserve_space(xdr, 20);
5256 if (!p)
5257 return nfserr_resource;
5258
5259 p = encode_cinfo(p, &removexattr->rmxa_cinfo);
5260 return 0;
5261}
5262
5263typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5264
5265/*
5266 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5267 * since we don't need to filter out obsolete ops as this is
5268 * done in the decoding phase.
5269 */
5270static const nfsd4_enc nfsd4_enc_ops[] = {
5271 [OP_ACCESS] = nfsd4_encode_access,
5272 [OP_CLOSE] = nfsd4_encode_close,
5273 [OP_COMMIT] = nfsd4_encode_commit,
5274 [OP_CREATE] = nfsd4_encode_create,
5275 [OP_DELEGPURGE] = nfsd4_encode_noop,
5276 [OP_DELEGRETURN] = nfsd4_encode_noop,
5277 [OP_GETATTR] = nfsd4_encode_getattr,
5278 [OP_GETFH] = nfsd4_encode_getfh,
5279 [OP_LINK] = nfsd4_encode_link,
5280 [OP_LOCK] = nfsd4_encode_lock,
5281 [OP_LOCKT] = nfsd4_encode_lockt,
5282 [OP_LOCKU] = nfsd4_encode_locku,
5283 [OP_LOOKUP] = nfsd4_encode_noop,
5284 [OP_LOOKUPP] = nfsd4_encode_noop,
5285 [OP_NVERIFY] = nfsd4_encode_noop,
5286 [OP_OPEN] = nfsd4_encode_open,
5287 [OP_OPENATTR] = nfsd4_encode_noop,
5288 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5289 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5290 [OP_PUTFH] = nfsd4_encode_noop,
5291 [OP_PUTPUBFH] = nfsd4_encode_noop,
5292 [OP_PUTROOTFH] = nfsd4_encode_noop,
5293 [OP_READ] = nfsd4_encode_read,
5294 [OP_READDIR] = nfsd4_encode_readdir,
5295 [OP_READLINK] = nfsd4_encode_readlink,
5296 [OP_REMOVE] = nfsd4_encode_remove,
5297 [OP_RENAME] = nfsd4_encode_rename,
5298 [OP_RENEW] = nfsd4_encode_noop,
5299 [OP_RESTOREFH] = nfsd4_encode_noop,
5300 [OP_SAVEFH] = nfsd4_encode_noop,
5301 [OP_SECINFO] = nfsd4_encode_secinfo,
5302 [OP_SETATTR] = nfsd4_encode_setattr,
5303 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5304 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5305 [OP_VERIFY] = nfsd4_encode_noop,
5306 [OP_WRITE] = nfsd4_encode_write,
5307 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5308
5309 /* NFSv4.1 operations */
5310 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5311 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5312 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5313 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5314 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5315 [OP_FREE_STATEID] = nfsd4_encode_noop,
5316 [OP_GET_DIR_DELEGATION] = nfsd4_encode_noop,
5317#ifdef CONFIG_NFSD_PNFS
5318 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5319 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5320 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5321 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5322 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5323#else
5324 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5325 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5326 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5327 [OP_LAYOUTGET] = nfsd4_encode_noop,
5328 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
5329#endif
5330 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5331 [OP_SEQUENCE] = nfsd4_encode_sequence,
5332 [OP_SET_SSV] = nfsd4_encode_noop,
5333 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5334 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5335 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5336 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5337
5338 /* NFSv4.2 operations */
5339 [OP_ALLOCATE] = nfsd4_encode_noop,
5340 [OP_COPY] = nfsd4_encode_copy,
5341 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5342 [OP_DEALLOCATE] = nfsd4_encode_noop,
5343 [OP_IO_ADVISE] = nfsd4_encode_noop,
5344 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5345 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5346 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5347 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5348 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5349 [OP_SEEK] = nfsd4_encode_seek,
5350 [OP_WRITE_SAME] = nfsd4_encode_noop,
5351 [OP_CLONE] = nfsd4_encode_noop,
5352
5353 /* RFC 8276 extended atributes operations */
5354 [OP_GETXATTR] = nfsd4_encode_getxattr,
5355 [OP_SETXATTR] = nfsd4_encode_setxattr,
5356 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5357 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5358};
5359
5360/*
5361 * Calculate whether we still have space to encode repsize bytes.
5362 * There are two considerations:
5363 * - For NFS versions >=4.1, the size of the reply must stay within
5364 * session limits
5365 * - For all NFS versions, we must stay within limited preallocated
5366 * buffer space.
5367 *
5368 * This is called before the operation is processed, so can only provide
5369 * an upper estimate. For some nonidempotent operations (such as
5370 * getattr), it's not necessarily a problem if that estimate is wrong,
5371 * as we can fail it after processing without significant side effects.
5372 */
5373__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5374{
5375 struct xdr_buf *buf = &resp->rqstp->rq_res;
5376 struct nfsd4_slot *slot = resp->cstate.slot;
5377
5378 if (buf->len + respsize <= buf->buflen)
5379 return nfs_ok;
5380 if (!nfsd4_has_session(&resp->cstate))
5381 return nfserr_resource;
5382 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5383 WARN_ON_ONCE(1);
5384 return nfserr_rep_too_big_to_cache;
5385 }
5386 return nfserr_rep_too_big;
5387}
5388
5389void
5390nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5391{
5392 struct xdr_stream *xdr = resp->xdr;
5393 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5394 struct svc_rqst *rqstp = resp->rqstp;
5395 const struct nfsd4_operation *opdesc = op->opdesc;
5396 int post_err_offset;
5397 nfsd4_enc encoder;
5398 __be32 *p;
5399
5400 p = xdr_reserve_space(xdr, 8);
5401 if (!p) {
5402 WARN_ON_ONCE(1);
5403 return;
5404 }
5405 *p++ = cpu_to_be32(op->opnum);
5406 post_err_offset = xdr->buf->len;
5407
5408 if (op->opnum == OP_ILLEGAL)
5409 goto status;
5410 if (op->status && opdesc &&
5411 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5412 goto status;
5413 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5414 !nfsd4_enc_ops[op->opnum]);
5415 encoder = nfsd4_enc_ops[op->opnum];
5416 op->status = encoder(resp, op->status, &op->u);
5417 if (op->status)
5418 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5419 if (opdesc && opdesc->op_release)
5420 opdesc->op_release(&op->u);
5421 xdr_commit_encode(xdr);
5422
5423 /* nfsd4_check_resp_size guarantees enough room for error status */
5424 if (!op->status) {
5425 int space_needed = 0;
5426 if (!nfsd4_last_compound_op(rqstp))
5427 space_needed = COMPOUND_ERR_SLACK_SPACE;
5428 op->status = nfsd4_check_resp_size(resp, space_needed);
5429 }
5430 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5431 struct nfsd4_slot *slot = resp->cstate.slot;
5432
5433 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5434 op->status = nfserr_rep_too_big_to_cache;
5435 else
5436 op->status = nfserr_rep_too_big;
5437 }
5438 if (op->status == nfserr_resource ||
5439 op->status == nfserr_rep_too_big ||
5440 op->status == nfserr_rep_too_big_to_cache) {
5441 /*
5442 * The operation may have already been encoded or
5443 * partially encoded. No op returns anything additional
5444 * in the case of one of these three errors, so we can
5445 * just truncate back to after the status. But it's a
5446 * bug if we had to do this on a non-idempotent op:
5447 */
5448 warn_on_nonidempotent_op(op);
5449 xdr_truncate_encode(xdr, post_err_offset);
5450 }
5451 if (so) {
5452 int len = xdr->buf->len - post_err_offset;
5453
5454 so->so_replay.rp_status = op->status;
5455 so->so_replay.rp_buflen = len;
5456 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
5457 so->so_replay.rp_buf, len);
5458 }
5459status:
5460 *p = op->status;
5461}
5462
5463/*
5464 * Encode the reply stored in the stateowner reply cache
5465 *
5466 * XDR note: do not encode rp->rp_buflen: the buffer contains the
5467 * previously sent already encoded operation.
5468 */
5469void
5470nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5471{
5472 __be32 *p;
5473 struct nfs4_replay *rp = op->replay;
5474
5475 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
5476 if (!p) {
5477 WARN_ON_ONCE(1);
5478 return;
5479 }
5480 *p++ = cpu_to_be32(op->opnum);
5481 *p++ = rp->rp_status; /* already xdr'ed */
5482
5483 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
5484}
5485
5486void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5487{
5488 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5489
5490 if (args->ops != args->iops) {
5491 vfree(args->ops);
5492 args->ops = args->iops;
5493 }
5494 while (args->to_free) {
5495 struct svcxdr_tmpbuf *tb = args->to_free;
5496 args->to_free = tb->next;
5497 kfree(tb);
5498 }
5499}
5500
5501bool
5502nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5503{
5504 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5505
5506 /* svcxdr_tmp_alloc */
5507 args->to_free = NULL;
5508
5509 args->xdr = xdr;
5510 args->ops = args->iops;
5511 args->rqstp = rqstp;
5512
5513 return nfsd4_decode_compound(args);
5514}
5515
5516bool
5517nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5518{
5519 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5520 __be32 *p;
5521
5522 /*
5523 * Send buffer space for the following items is reserved
5524 * at the top of nfsd4_proc_compound().
5525 */
5526 p = resp->statusp;
5527
5528 *p++ = resp->cstate.status;
5529
5530 rqstp->rq_next_page = xdr->page_ptr + 1;
5531
5532 *p++ = htonl(resp->taglen);
5533 memcpy(p, resp->tag, resp->taglen);
5534 p += XDR_QUADLEN(resp->taglen);
5535 *p++ = htonl(resp->opcnt);
5536
5537 nfsd4_sequence_done(resp);
5538 return true;
5539}
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
44#include "idmap.h"
45#include "acl.h"
46#include "xdr4.h"
47#include "vfs.h"
48#include "state.h"
49#include "cache.h"
50#include "netns.h"
51#include "pnfs.h"
52
53#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
54#include <linux/security.h>
55#endif
56
57
58#define NFSDDBG_FACILITY NFSDDBG_XDR
59
60const u32 nfsd_suppattrs[3][3] = {
61 {NFSD4_SUPPORTED_ATTRS_WORD0,
62 NFSD4_SUPPORTED_ATTRS_WORD1,
63 NFSD4_SUPPORTED_ATTRS_WORD2},
64
65 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
66 NFSD4_1_SUPPORTED_ATTRS_WORD1,
67 NFSD4_1_SUPPORTED_ATTRS_WORD2},
68
69 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
70 NFSD4_1_SUPPORTED_ATTRS_WORD1,
71 NFSD4_2_SUPPORTED_ATTRS_WORD2},
72};
73
74/*
75 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
76 * directory in order to indicate to the client that a filesystem boundary is present
77 * We use a fixed fsid for a referral
78 */
79#define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
80#define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
81
82static __be32
83check_filename(char *str, int len)
84{
85 int i;
86
87 if (len == 0)
88 return nfserr_inval;
89 if (isdotent(str, len))
90 return nfserr_badname;
91 for (i = 0; i < len; i++)
92 if (str[i] == '/')
93 return nfserr_badname;
94 return 0;
95}
96
97#define DECODE_HEAD \
98 __be32 *p; \
99 __be32 status
100#define DECODE_TAIL \
101 status = 0; \
102out: \
103 return status; \
104xdr_error: \
105 dprintk("NFSD: xdr error (%s:%d)\n", \
106 __FILE__, __LINE__); \
107 status = nfserr_bad_xdr; \
108 goto out
109
110#define READMEM(x,nbytes) do { \
111 x = (char *)p; \
112 p += XDR_QUADLEN(nbytes); \
113} while (0)
114#define SAVEMEM(x,nbytes) do { \
115 if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
116 savemem(argp, p, nbytes) : \
117 (char *)p)) { \
118 dprintk("NFSD: xdr error (%s:%d)\n", \
119 __FILE__, __LINE__); \
120 goto xdr_error; \
121 } \
122 p += XDR_QUADLEN(nbytes); \
123} while (0)
124#define COPYMEM(x,nbytes) do { \
125 memcpy((x), p, nbytes); \
126 p += XDR_QUADLEN(nbytes); \
127} while (0)
128
129/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
130#define READ_BUF(nbytes) do { \
131 if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) { \
132 p = argp->p; \
133 argp->p += XDR_QUADLEN(nbytes); \
134 } else if (!(p = read_buf(argp, nbytes))) { \
135 dprintk("NFSD: xdr error (%s:%d)\n", \
136 __FILE__, __LINE__); \
137 goto xdr_error; \
138 } \
139} while (0)
140
141static void next_decode_page(struct nfsd4_compoundargs *argp)
142{
143 argp->p = page_address(argp->pagelist[0]);
144 argp->pagelist++;
145 if (argp->pagelen < PAGE_SIZE) {
146 argp->end = argp->p + XDR_QUADLEN(argp->pagelen);
147 argp->pagelen = 0;
148 } else {
149 argp->end = argp->p + (PAGE_SIZE>>2);
150 argp->pagelen -= PAGE_SIZE;
151 }
152}
153
154static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
155{
156 /* We want more bytes than seem to be available.
157 * Maybe we need a new page, maybe we have just run out
158 */
159 unsigned int avail = (char *)argp->end - (char *)argp->p;
160 __be32 *p;
161
162 if (argp->pagelen == 0) {
163 struct kvec *vec = &argp->rqstp->rq_arg.tail[0];
164
165 if (!argp->tail) {
166 argp->tail = true;
167 avail = vec->iov_len;
168 argp->p = vec->iov_base;
169 argp->end = vec->iov_base + avail;
170 }
171
172 if (avail < nbytes)
173 return NULL;
174
175 p = argp->p;
176 argp->p += XDR_QUADLEN(nbytes);
177 return p;
178 }
179
180 if (avail + argp->pagelen < nbytes)
181 return NULL;
182 if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
183 return NULL;
184 /* ok, we can do it with the current plus the next page */
185 if (nbytes <= sizeof(argp->tmp))
186 p = argp->tmp;
187 else {
188 kfree(argp->tmpp);
189 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
190 if (!p)
191 return NULL;
192
193 }
194 /*
195 * The following memcpy is safe because read_buf is always
196 * called with nbytes > avail, and the two cases above both
197 * guarantee p points to at least nbytes bytes.
198 */
199 memcpy(p, argp->p, avail);
200 next_decode_page(argp);
201 memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
202 argp->p += XDR_QUADLEN(nbytes - avail);
203 return p;
204}
205
206static int zero_clientid(clientid_t *clid)
207{
208 return (clid->cl_boot == 0) && (clid->cl_id == 0);
209}
210
211/**
212 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
213 * @argp: NFSv4 compound argument structure
214 * @p: pointer to be freed (with kfree())
215 *
216 * Marks @p to be freed when processing the compound operation
217 * described in @argp finishes.
218 */
219static void *
220svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
221{
222 struct svcxdr_tmpbuf *tb;
223
224 tb = kmalloc(sizeof(*tb) + len, GFP_KERNEL);
225 if (!tb)
226 return NULL;
227 tb->next = argp->to_free;
228 argp->to_free = tb;
229 return tb->buf;
230}
231
232/*
233 * For xdr strings that need to be passed to other kernel api's
234 * as null-terminated strings.
235 *
236 * Note null-terminating in place usually isn't safe since the
237 * buffer might end on a page boundary.
238 */
239static char *
240svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, u32 len)
241{
242 char *p = svcxdr_tmpalloc(argp, len + 1);
243
244 if (!p)
245 return NULL;
246 memcpy(p, buf, len);
247 p[len] = '\0';
248 return p;
249}
250
251/**
252 * savemem - duplicate a chunk of memory for later processing
253 * @argp: NFSv4 compound argument structure to be freed with
254 * @p: pointer to be duplicated
255 * @nbytes: length to be duplicated
256 *
257 * Returns a pointer to a copy of @nbytes bytes of memory at @p
258 * that are preserved until processing of the NFSv4 compound
259 * operation described by @argp finishes.
260 */
261static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
262{
263 void *ret;
264
265 ret = svcxdr_tmpalloc(argp, nbytes);
266 if (!ret)
267 return NULL;
268 memcpy(ret, p, nbytes);
269 return ret;
270}
271
272/*
273 * We require the high 32 bits of 'seconds' to be 0, and
274 * we ignore all 32 bits of 'nseconds'.
275 */
276static __be32
277nfsd4_decode_time(struct nfsd4_compoundargs *argp, struct timespec *tv)
278{
279 DECODE_HEAD;
280 u64 sec;
281
282 READ_BUF(12);
283 p = xdr_decode_hyper(p, &sec);
284 tv->tv_sec = sec;
285 tv->tv_nsec = be32_to_cpup(p++);
286 if (tv->tv_nsec >= (u32)1000000000)
287 return nfserr_inval;
288
289 DECODE_TAIL;
290}
291
292static __be32
293nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
294{
295 u32 bmlen;
296 DECODE_HEAD;
297
298 bmval[0] = 0;
299 bmval[1] = 0;
300 bmval[2] = 0;
301
302 READ_BUF(4);
303 bmlen = be32_to_cpup(p++);
304 if (bmlen > 1000)
305 goto xdr_error;
306
307 READ_BUF(bmlen << 2);
308 if (bmlen > 0)
309 bmval[0] = be32_to_cpup(p++);
310 if (bmlen > 1)
311 bmval[1] = be32_to_cpup(p++);
312 if (bmlen > 2)
313 bmval[2] = be32_to_cpup(p++);
314
315 DECODE_TAIL;
316}
317
318static __be32
319nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
320 struct iattr *iattr, struct nfs4_acl **acl,
321 struct xdr_netobj *label, int *umask)
322{
323 int expected_len, len = 0;
324 u32 dummy32;
325 char *buf;
326
327 DECODE_HEAD;
328 iattr->ia_valid = 0;
329 if ((status = nfsd4_decode_bitmap(argp, bmval)))
330 return status;
331
332 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
333 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
334 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
335 if (nfsd_attrs_supported(argp->minorversion, bmval))
336 return nfserr_inval;
337 return nfserr_attrnotsupp;
338 }
339
340 READ_BUF(4);
341 expected_len = be32_to_cpup(p++);
342
343 if (bmval[0] & FATTR4_WORD0_SIZE) {
344 READ_BUF(8);
345 len += 8;
346 p = xdr_decode_hyper(p, &iattr->ia_size);
347 iattr->ia_valid |= ATTR_SIZE;
348 }
349 if (bmval[0] & FATTR4_WORD0_ACL) {
350 u32 nace;
351 struct nfs4_ace *ace;
352
353 READ_BUF(4); len += 4;
354 nace = be32_to_cpup(p++);
355
356 if (nace > NFS4_ACL_MAX)
357 return nfserr_fbig;
358
359 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
360 if (*acl == NULL)
361 return nfserr_jukebox;
362
363 (*acl)->naces = nace;
364 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
365 READ_BUF(16); len += 16;
366 ace->type = be32_to_cpup(p++);
367 ace->flag = be32_to_cpup(p++);
368 ace->access_mask = be32_to_cpup(p++);
369 dummy32 = be32_to_cpup(p++);
370 READ_BUF(dummy32);
371 len += XDR_QUADLEN(dummy32) << 2;
372 READMEM(buf, dummy32);
373 ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
374 status = nfs_ok;
375 if (ace->whotype != NFS4_ACL_WHO_NAMED)
376 ;
377 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
378 status = nfsd_map_name_to_gid(argp->rqstp,
379 buf, dummy32, &ace->who_gid);
380 else
381 status = nfsd_map_name_to_uid(argp->rqstp,
382 buf, dummy32, &ace->who_uid);
383 if (status)
384 return status;
385 }
386 } else
387 *acl = NULL;
388 if (bmval[1] & FATTR4_WORD1_MODE) {
389 READ_BUF(4);
390 len += 4;
391 iattr->ia_mode = be32_to_cpup(p++);
392 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
393 iattr->ia_valid |= ATTR_MODE;
394 }
395 if (bmval[1] & FATTR4_WORD1_OWNER) {
396 READ_BUF(4);
397 len += 4;
398 dummy32 = be32_to_cpup(p++);
399 READ_BUF(dummy32);
400 len += (XDR_QUADLEN(dummy32) << 2);
401 READMEM(buf, dummy32);
402 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
403 return status;
404 iattr->ia_valid |= ATTR_UID;
405 }
406 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
407 READ_BUF(4);
408 len += 4;
409 dummy32 = be32_to_cpup(p++);
410 READ_BUF(dummy32);
411 len += (XDR_QUADLEN(dummy32) << 2);
412 READMEM(buf, dummy32);
413 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
414 return status;
415 iattr->ia_valid |= ATTR_GID;
416 }
417 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
418 READ_BUF(4);
419 len += 4;
420 dummy32 = be32_to_cpup(p++);
421 switch (dummy32) {
422 case NFS4_SET_TO_CLIENT_TIME:
423 len += 12;
424 status = nfsd4_decode_time(argp, &iattr->ia_atime);
425 if (status)
426 return status;
427 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
428 break;
429 case NFS4_SET_TO_SERVER_TIME:
430 iattr->ia_valid |= ATTR_ATIME;
431 break;
432 default:
433 goto xdr_error;
434 }
435 }
436 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
437 READ_BUF(4);
438 len += 4;
439 dummy32 = be32_to_cpup(p++);
440 switch (dummy32) {
441 case NFS4_SET_TO_CLIENT_TIME:
442 len += 12;
443 status = nfsd4_decode_time(argp, &iattr->ia_mtime);
444 if (status)
445 return status;
446 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
447 break;
448 case NFS4_SET_TO_SERVER_TIME:
449 iattr->ia_valid |= ATTR_MTIME;
450 break;
451 default:
452 goto xdr_error;
453 }
454 }
455
456 label->len = 0;
457 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
458 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
459 READ_BUF(4);
460 len += 4;
461 dummy32 = be32_to_cpup(p++); /* lfs: we don't use it */
462 READ_BUF(4);
463 len += 4;
464 dummy32 = be32_to_cpup(p++); /* pi: we don't use it either */
465 READ_BUF(4);
466 len += 4;
467 dummy32 = be32_to_cpup(p++);
468 READ_BUF(dummy32);
469 if (dummy32 > NFS4_MAXLABELLEN)
470 return nfserr_badlabel;
471 len += (XDR_QUADLEN(dummy32) << 2);
472 READMEM(buf, dummy32);
473 label->len = dummy32;
474 label->data = svcxdr_dupstr(argp, buf, dummy32);
475 if (!label->data)
476 return nfserr_jukebox;
477 }
478 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
479 if (!umask)
480 goto xdr_error;
481 READ_BUF(8);
482 len += 8;
483 dummy32 = be32_to_cpup(p++);
484 iattr->ia_mode = dummy32 & (S_IFMT | S_IALLUGO);
485 dummy32 = be32_to_cpup(p++);
486 *umask = dummy32 & S_IRWXUGO;
487 iattr->ia_valid |= ATTR_MODE;
488 }
489 if (len != expected_len)
490 goto xdr_error;
491
492 DECODE_TAIL;
493}
494
495static __be32
496nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
497{
498 DECODE_HEAD;
499
500 READ_BUF(sizeof(stateid_t));
501 sid->si_generation = be32_to_cpup(p++);
502 COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
503
504 DECODE_TAIL;
505}
506
507static __be32
508nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
509{
510 DECODE_HEAD;
511
512 READ_BUF(4);
513 access->ac_req_access = be32_to_cpup(p++);
514
515 DECODE_TAIL;
516}
517
518static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
519{
520 DECODE_HEAD;
521 u32 dummy, uid, gid;
522 char *machine_name;
523 int i;
524 int nr_secflavs;
525
526 /* callback_sec_params4 */
527 READ_BUF(4);
528 nr_secflavs = be32_to_cpup(p++);
529 if (nr_secflavs)
530 cbs->flavor = (u32)(-1);
531 else
532 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
533 cbs->flavor = 0;
534 for (i = 0; i < nr_secflavs; ++i) {
535 READ_BUF(4);
536 dummy = be32_to_cpup(p++);
537 switch (dummy) {
538 case RPC_AUTH_NULL:
539 /* Nothing to read */
540 if (cbs->flavor == (u32)(-1))
541 cbs->flavor = RPC_AUTH_NULL;
542 break;
543 case RPC_AUTH_UNIX:
544 READ_BUF(8);
545 /* stamp */
546 dummy = be32_to_cpup(p++);
547
548 /* machine name */
549 dummy = be32_to_cpup(p++);
550 READ_BUF(dummy);
551 SAVEMEM(machine_name, dummy);
552
553 /* uid, gid */
554 READ_BUF(8);
555 uid = be32_to_cpup(p++);
556 gid = be32_to_cpup(p++);
557
558 /* more gids */
559 READ_BUF(4);
560 dummy = be32_to_cpup(p++);
561 READ_BUF(dummy * 4);
562 if (cbs->flavor == (u32)(-1)) {
563 kuid_t kuid = make_kuid(&init_user_ns, uid);
564 kgid_t kgid = make_kgid(&init_user_ns, gid);
565 if (uid_valid(kuid) && gid_valid(kgid)) {
566 cbs->uid = kuid;
567 cbs->gid = kgid;
568 cbs->flavor = RPC_AUTH_UNIX;
569 } else {
570 dprintk("RPC_AUTH_UNIX with invalid"
571 "uid or gid ignoring!\n");
572 }
573 }
574 break;
575 case RPC_AUTH_GSS:
576 dprintk("RPC_AUTH_GSS callback secflavor "
577 "not supported!\n");
578 READ_BUF(8);
579 /* gcbp_service */
580 dummy = be32_to_cpup(p++);
581 /* gcbp_handle_from_server */
582 dummy = be32_to_cpup(p++);
583 READ_BUF(dummy);
584 p += XDR_QUADLEN(dummy);
585 /* gcbp_handle_from_client */
586 READ_BUF(4);
587 dummy = be32_to_cpup(p++);
588 READ_BUF(dummy);
589 break;
590 default:
591 dprintk("Illegal callback secflavor\n");
592 return nfserr_inval;
593 }
594 }
595 DECODE_TAIL;
596}
597
598static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
599{
600 DECODE_HEAD;
601
602 READ_BUF(4);
603 bc->bc_cb_program = be32_to_cpup(p++);
604 nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
605
606 DECODE_TAIL;
607}
608
609static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
610{
611 DECODE_HEAD;
612
613 READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
614 COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
615 bcts->dir = be32_to_cpup(p++);
616 /* XXX: skipping ctsa_use_conn_in_rdma_mode. Perhaps Tom Tucker
617 * could help us figure out we should be using it. */
618 DECODE_TAIL;
619}
620
621static __be32
622nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
623{
624 DECODE_HEAD;
625
626 READ_BUF(4);
627 close->cl_seqid = be32_to_cpup(p++);
628 return nfsd4_decode_stateid(argp, &close->cl_stateid);
629
630 DECODE_TAIL;
631}
632
633
634static __be32
635nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
636{
637 DECODE_HEAD;
638
639 READ_BUF(12);
640 p = xdr_decode_hyper(p, &commit->co_offset);
641 commit->co_count = be32_to_cpup(p++);
642
643 DECODE_TAIL;
644}
645
646static __be32
647nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
648{
649 DECODE_HEAD;
650
651 READ_BUF(4);
652 create->cr_type = be32_to_cpup(p++);
653 switch (create->cr_type) {
654 case NF4LNK:
655 READ_BUF(4);
656 create->cr_datalen = be32_to_cpup(p++);
657 READ_BUF(create->cr_datalen);
658 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
659 if (!create->cr_data)
660 return nfserr_jukebox;
661 break;
662 case NF4BLK:
663 case NF4CHR:
664 READ_BUF(8);
665 create->cr_specdata1 = be32_to_cpup(p++);
666 create->cr_specdata2 = be32_to_cpup(p++);
667 break;
668 case NF4SOCK:
669 case NF4FIFO:
670 case NF4DIR:
671 default:
672 break;
673 }
674
675 READ_BUF(4);
676 create->cr_namelen = be32_to_cpup(p++);
677 READ_BUF(create->cr_namelen);
678 SAVEMEM(create->cr_name, create->cr_namelen);
679 if ((status = check_filename(create->cr_name, create->cr_namelen)))
680 return status;
681
682 status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
683 &create->cr_acl, &create->cr_label,
684 &create->cr_umask);
685 if (status)
686 goto out;
687
688 DECODE_TAIL;
689}
690
691static inline __be32
692nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
693{
694 return nfsd4_decode_stateid(argp, &dr->dr_stateid);
695}
696
697static inline __be32
698nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
699{
700 return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
701}
702
703static __be32
704nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
705{
706 DECODE_HEAD;
707
708 READ_BUF(4);
709 link->li_namelen = be32_to_cpup(p++);
710 READ_BUF(link->li_namelen);
711 SAVEMEM(link->li_name, link->li_namelen);
712 if ((status = check_filename(link->li_name, link->li_namelen)))
713 return status;
714
715 DECODE_TAIL;
716}
717
718static __be32
719nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
720{
721 DECODE_HEAD;
722
723 /*
724 * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
725 */
726 READ_BUF(28);
727 lock->lk_type = be32_to_cpup(p++);
728 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
729 goto xdr_error;
730 lock->lk_reclaim = be32_to_cpup(p++);
731 p = xdr_decode_hyper(p, &lock->lk_offset);
732 p = xdr_decode_hyper(p, &lock->lk_length);
733 lock->lk_is_new = be32_to_cpup(p++);
734
735 if (lock->lk_is_new) {
736 READ_BUF(4);
737 lock->lk_new_open_seqid = be32_to_cpup(p++);
738 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
739 if (status)
740 return status;
741 READ_BUF(8 + sizeof(clientid_t));
742 lock->lk_new_lock_seqid = be32_to_cpup(p++);
743 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
744 lock->lk_new_owner.len = be32_to_cpup(p++);
745 READ_BUF(lock->lk_new_owner.len);
746 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
747 } else {
748 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
749 if (status)
750 return status;
751 READ_BUF(4);
752 lock->lk_old_lock_seqid = be32_to_cpup(p++);
753 }
754
755 DECODE_TAIL;
756}
757
758static __be32
759nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
760{
761 DECODE_HEAD;
762
763 READ_BUF(32);
764 lockt->lt_type = be32_to_cpup(p++);
765 if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
766 goto xdr_error;
767 p = xdr_decode_hyper(p, &lockt->lt_offset);
768 p = xdr_decode_hyper(p, &lockt->lt_length);
769 COPYMEM(&lockt->lt_clientid, 8);
770 lockt->lt_owner.len = be32_to_cpup(p++);
771 READ_BUF(lockt->lt_owner.len);
772 READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
773
774 DECODE_TAIL;
775}
776
777static __be32
778nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
779{
780 DECODE_HEAD;
781
782 READ_BUF(8);
783 locku->lu_type = be32_to_cpup(p++);
784 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
785 goto xdr_error;
786 locku->lu_seqid = be32_to_cpup(p++);
787 status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
788 if (status)
789 return status;
790 READ_BUF(16);
791 p = xdr_decode_hyper(p, &locku->lu_offset);
792 p = xdr_decode_hyper(p, &locku->lu_length);
793
794 DECODE_TAIL;
795}
796
797static __be32
798nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
799{
800 DECODE_HEAD;
801
802 READ_BUF(4);
803 lookup->lo_len = be32_to_cpup(p++);
804 READ_BUF(lookup->lo_len);
805 SAVEMEM(lookup->lo_name, lookup->lo_len);
806 if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
807 return status;
808
809 DECODE_TAIL;
810}
811
812static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
813{
814 __be32 *p;
815 u32 w;
816
817 READ_BUF(4);
818 w = be32_to_cpup(p++);
819 *share_access = w & NFS4_SHARE_ACCESS_MASK;
820 *deleg_want = w & NFS4_SHARE_WANT_MASK;
821 if (deleg_when)
822 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
823
824 switch (w & NFS4_SHARE_ACCESS_MASK) {
825 case NFS4_SHARE_ACCESS_READ:
826 case NFS4_SHARE_ACCESS_WRITE:
827 case NFS4_SHARE_ACCESS_BOTH:
828 break;
829 default:
830 return nfserr_bad_xdr;
831 }
832 w &= ~NFS4_SHARE_ACCESS_MASK;
833 if (!w)
834 return nfs_ok;
835 if (!argp->minorversion)
836 return nfserr_bad_xdr;
837 switch (w & NFS4_SHARE_WANT_MASK) {
838 case NFS4_SHARE_WANT_NO_PREFERENCE:
839 case NFS4_SHARE_WANT_READ_DELEG:
840 case NFS4_SHARE_WANT_WRITE_DELEG:
841 case NFS4_SHARE_WANT_ANY_DELEG:
842 case NFS4_SHARE_WANT_NO_DELEG:
843 case NFS4_SHARE_WANT_CANCEL:
844 break;
845 default:
846 return nfserr_bad_xdr;
847 }
848 w &= ~NFS4_SHARE_WANT_MASK;
849 if (!w)
850 return nfs_ok;
851
852 if (!deleg_when) /* open_downgrade */
853 return nfserr_inval;
854 switch (w) {
855 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
856 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
857 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
858 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
859 return nfs_ok;
860 }
861xdr_error:
862 return nfserr_bad_xdr;
863}
864
865static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
866{
867 __be32 *p;
868
869 READ_BUF(4);
870 *x = be32_to_cpup(p++);
871 /* Note: unlinke access bits, deny bits may be zero. */
872 if (*x & ~NFS4_SHARE_DENY_BOTH)
873 return nfserr_bad_xdr;
874 return nfs_ok;
875xdr_error:
876 return nfserr_bad_xdr;
877}
878
879static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
880{
881 __be32 *p;
882
883 READ_BUF(4);
884 o->len = be32_to_cpup(p++);
885
886 if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
887 return nfserr_bad_xdr;
888
889 READ_BUF(o->len);
890 SAVEMEM(o->data, o->len);
891 return nfs_ok;
892xdr_error:
893 return nfserr_bad_xdr;
894}
895
896static __be32
897nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
898{
899 DECODE_HEAD;
900 u32 dummy;
901
902 memset(open->op_bmval, 0, sizeof(open->op_bmval));
903 open->op_iattr.ia_valid = 0;
904 open->op_openowner = NULL;
905
906 open->op_xdr_error = 0;
907 /* seqid, share_access, share_deny, clientid, ownerlen */
908 READ_BUF(4);
909 open->op_seqid = be32_to_cpup(p++);
910 /* decode, yet ignore deleg_when until supported */
911 status = nfsd4_decode_share_access(argp, &open->op_share_access,
912 &open->op_deleg_want, &dummy);
913 if (status)
914 goto xdr_error;
915 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
916 if (status)
917 goto xdr_error;
918 READ_BUF(sizeof(clientid_t));
919 COPYMEM(&open->op_clientid, sizeof(clientid_t));
920 status = nfsd4_decode_opaque(argp, &open->op_owner);
921 if (status)
922 goto xdr_error;
923 READ_BUF(4);
924 open->op_create = be32_to_cpup(p++);
925 switch (open->op_create) {
926 case NFS4_OPEN_NOCREATE:
927 break;
928 case NFS4_OPEN_CREATE:
929 READ_BUF(4);
930 open->op_createmode = be32_to_cpup(p++);
931 switch (open->op_createmode) {
932 case NFS4_CREATE_UNCHECKED:
933 case NFS4_CREATE_GUARDED:
934 status = nfsd4_decode_fattr(argp, open->op_bmval,
935 &open->op_iattr, &open->op_acl, &open->op_label,
936 &open->op_umask);
937 if (status)
938 goto out;
939 break;
940 case NFS4_CREATE_EXCLUSIVE:
941 READ_BUF(NFS4_VERIFIER_SIZE);
942 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
943 break;
944 case NFS4_CREATE_EXCLUSIVE4_1:
945 if (argp->minorversion < 1)
946 goto xdr_error;
947 READ_BUF(NFS4_VERIFIER_SIZE);
948 COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
949 status = nfsd4_decode_fattr(argp, open->op_bmval,
950 &open->op_iattr, &open->op_acl, &open->op_label,
951 &open->op_umask);
952 if (status)
953 goto out;
954 break;
955 default:
956 goto xdr_error;
957 }
958 break;
959 default:
960 goto xdr_error;
961 }
962
963 /* open_claim */
964 READ_BUF(4);
965 open->op_claim_type = be32_to_cpup(p++);
966 switch (open->op_claim_type) {
967 case NFS4_OPEN_CLAIM_NULL:
968 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
969 READ_BUF(4);
970 open->op_fname.len = be32_to_cpup(p++);
971 READ_BUF(open->op_fname.len);
972 SAVEMEM(open->op_fname.data, open->op_fname.len);
973 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
974 return status;
975 break;
976 case NFS4_OPEN_CLAIM_PREVIOUS:
977 READ_BUF(4);
978 open->op_delegate_type = be32_to_cpup(p++);
979 break;
980 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
981 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
982 if (status)
983 return status;
984 READ_BUF(4);
985 open->op_fname.len = be32_to_cpup(p++);
986 READ_BUF(open->op_fname.len);
987 SAVEMEM(open->op_fname.data, open->op_fname.len);
988 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
989 return status;
990 break;
991 case NFS4_OPEN_CLAIM_FH:
992 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
993 if (argp->minorversion < 1)
994 goto xdr_error;
995 /* void */
996 break;
997 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
998 if (argp->minorversion < 1)
999 goto xdr_error;
1000 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
1001 if (status)
1002 return status;
1003 break;
1004 default:
1005 goto xdr_error;
1006 }
1007
1008 DECODE_TAIL;
1009}
1010
1011static __be32
1012nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
1013{
1014 DECODE_HEAD;
1015
1016 if (argp->minorversion >= 1)
1017 return nfserr_notsupp;
1018
1019 status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
1020 if (status)
1021 return status;
1022 READ_BUF(4);
1023 open_conf->oc_seqid = be32_to_cpup(p++);
1024
1025 DECODE_TAIL;
1026}
1027
1028static __be32
1029nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
1030{
1031 DECODE_HEAD;
1032
1033 status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
1034 if (status)
1035 return status;
1036 READ_BUF(4);
1037 open_down->od_seqid = be32_to_cpup(p++);
1038 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1039 &open_down->od_deleg_want, NULL);
1040 if (status)
1041 return status;
1042 status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1043 if (status)
1044 return status;
1045 DECODE_TAIL;
1046}
1047
1048static __be32
1049nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
1050{
1051 DECODE_HEAD;
1052
1053 READ_BUF(4);
1054 putfh->pf_fhlen = be32_to_cpup(p++);
1055 if (putfh->pf_fhlen > NFS4_FHSIZE)
1056 goto xdr_error;
1057 READ_BUF(putfh->pf_fhlen);
1058 SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
1059
1060 DECODE_TAIL;
1061}
1062
1063static __be32
1064nfsd4_decode_putpubfh(struct nfsd4_compoundargs *argp, void *p)
1065{
1066 if (argp->minorversion == 0)
1067 return nfs_ok;
1068 return nfserr_notsupp;
1069}
1070
1071static __be32
1072nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
1073{
1074 DECODE_HEAD;
1075
1076 status = nfsd4_decode_stateid(argp, &read->rd_stateid);
1077 if (status)
1078 return status;
1079 READ_BUF(12);
1080 p = xdr_decode_hyper(p, &read->rd_offset);
1081 read->rd_length = be32_to_cpup(p++);
1082
1083 DECODE_TAIL;
1084}
1085
1086static __be32
1087nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
1088{
1089 DECODE_HEAD;
1090
1091 READ_BUF(24);
1092 p = xdr_decode_hyper(p, &readdir->rd_cookie);
1093 COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
1094 readdir->rd_dircount = be32_to_cpup(p++);
1095 readdir->rd_maxcount = be32_to_cpup(p++);
1096 if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
1097 goto out;
1098
1099 DECODE_TAIL;
1100}
1101
1102static __be32
1103nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
1104{
1105 DECODE_HEAD;
1106
1107 READ_BUF(4);
1108 remove->rm_namelen = be32_to_cpup(p++);
1109 READ_BUF(remove->rm_namelen);
1110 SAVEMEM(remove->rm_name, remove->rm_namelen);
1111 if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1112 return status;
1113
1114 DECODE_TAIL;
1115}
1116
1117static __be32
1118nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1119{
1120 DECODE_HEAD;
1121
1122 READ_BUF(4);
1123 rename->rn_snamelen = be32_to_cpup(p++);
1124 READ_BUF(rename->rn_snamelen);
1125 SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1126 READ_BUF(4);
1127 rename->rn_tnamelen = be32_to_cpup(p++);
1128 READ_BUF(rename->rn_tnamelen);
1129 SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1130 if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1131 return status;
1132 if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1133 return status;
1134
1135 DECODE_TAIL;
1136}
1137
1138static __be32
1139nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1140{
1141 DECODE_HEAD;
1142
1143 if (argp->minorversion >= 1)
1144 return nfserr_notsupp;
1145
1146 READ_BUF(sizeof(clientid_t));
1147 COPYMEM(clientid, sizeof(clientid_t));
1148
1149 DECODE_TAIL;
1150}
1151
1152static __be32
1153nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1154 struct nfsd4_secinfo *secinfo)
1155{
1156 DECODE_HEAD;
1157
1158 READ_BUF(4);
1159 secinfo->si_namelen = be32_to_cpup(p++);
1160 READ_BUF(secinfo->si_namelen);
1161 SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1162 status = check_filename(secinfo->si_name, secinfo->si_namelen);
1163 if (status)
1164 return status;
1165 DECODE_TAIL;
1166}
1167
1168static __be32
1169nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1170 struct nfsd4_secinfo_no_name *sin)
1171{
1172 DECODE_HEAD;
1173
1174 READ_BUF(4);
1175 sin->sin_style = be32_to_cpup(p++);
1176 DECODE_TAIL;
1177}
1178
1179static __be32
1180nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1181{
1182 __be32 status;
1183
1184 status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1185 if (status)
1186 return status;
1187 return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1188 &setattr->sa_acl, &setattr->sa_label, NULL);
1189}
1190
1191static __be32
1192nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1193{
1194 DECODE_HEAD;
1195
1196 if (argp->minorversion >= 1)
1197 return nfserr_notsupp;
1198
1199 READ_BUF(NFS4_VERIFIER_SIZE);
1200 COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1201
1202 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1203 if (status)
1204 return nfserr_bad_xdr;
1205 READ_BUF(8);
1206 setclientid->se_callback_prog = be32_to_cpup(p++);
1207 setclientid->se_callback_netid_len = be32_to_cpup(p++);
1208 READ_BUF(setclientid->se_callback_netid_len);
1209 SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1210 READ_BUF(4);
1211 setclientid->se_callback_addr_len = be32_to_cpup(p++);
1212
1213 READ_BUF(setclientid->se_callback_addr_len);
1214 SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1215 READ_BUF(4);
1216 setclientid->se_callback_ident = be32_to_cpup(p++);
1217
1218 DECODE_TAIL;
1219}
1220
1221static __be32
1222nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1223{
1224 DECODE_HEAD;
1225
1226 if (argp->minorversion >= 1)
1227 return nfserr_notsupp;
1228
1229 READ_BUF(8 + NFS4_VERIFIER_SIZE);
1230 COPYMEM(&scd_c->sc_clientid, 8);
1231 COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1232
1233 DECODE_TAIL;
1234}
1235
1236/* Also used for NVERIFY */
1237static __be32
1238nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1239{
1240 DECODE_HEAD;
1241
1242 if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1243 goto out;
1244
1245 /* For convenience's sake, we compare raw xdr'd attributes in
1246 * nfsd4_proc_verify */
1247
1248 READ_BUF(4);
1249 verify->ve_attrlen = be32_to_cpup(p++);
1250 READ_BUF(verify->ve_attrlen);
1251 SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1252
1253 DECODE_TAIL;
1254}
1255
1256static __be32
1257nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1258{
1259 int avail;
1260 int len;
1261 DECODE_HEAD;
1262
1263 status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1264 if (status)
1265 return status;
1266 READ_BUF(16);
1267 p = xdr_decode_hyper(p, &write->wr_offset);
1268 write->wr_stable_how = be32_to_cpup(p++);
1269 if (write->wr_stable_how > NFS_FILE_SYNC)
1270 goto xdr_error;
1271 write->wr_buflen = be32_to_cpup(p++);
1272
1273 /* Sorry .. no magic macros for this.. *
1274 * READ_BUF(write->wr_buflen);
1275 * SAVEMEM(write->wr_buf, write->wr_buflen);
1276 */
1277 avail = (char*)argp->end - (char*)argp->p;
1278 if (avail + argp->pagelen < write->wr_buflen) {
1279 dprintk("NFSD: xdr error (%s:%d)\n",
1280 __FILE__, __LINE__);
1281 goto xdr_error;
1282 }
1283 write->wr_head.iov_base = p;
1284 write->wr_head.iov_len = avail;
1285 write->wr_pagelist = argp->pagelist;
1286
1287 len = XDR_QUADLEN(write->wr_buflen) << 2;
1288 if (len >= avail) {
1289 int pages;
1290
1291 len -= avail;
1292
1293 pages = len >> PAGE_SHIFT;
1294 argp->pagelist += pages;
1295 argp->pagelen -= pages * PAGE_SIZE;
1296 len -= pages * PAGE_SIZE;
1297
1298 next_decode_page(argp);
1299 }
1300 argp->p += XDR_QUADLEN(len);
1301
1302 DECODE_TAIL;
1303}
1304
1305static __be32
1306nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1307{
1308 DECODE_HEAD;
1309
1310 if (argp->minorversion >= 1)
1311 return nfserr_notsupp;
1312
1313 READ_BUF(12);
1314 COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1315 rlockowner->rl_owner.len = be32_to_cpup(p++);
1316 READ_BUF(rlockowner->rl_owner.len);
1317 READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1318
1319 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1320 return nfserr_inval;
1321 DECODE_TAIL;
1322}
1323
1324static __be32
1325nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1326 struct nfsd4_exchange_id *exid)
1327{
1328 int dummy, tmp;
1329 DECODE_HEAD;
1330
1331 READ_BUF(NFS4_VERIFIER_SIZE);
1332 COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1333
1334 status = nfsd4_decode_opaque(argp, &exid->clname);
1335 if (status)
1336 return nfserr_bad_xdr;
1337
1338 READ_BUF(4);
1339 exid->flags = be32_to_cpup(p++);
1340
1341 /* Ignore state_protect4_a */
1342 READ_BUF(4);
1343 exid->spa_how = be32_to_cpup(p++);
1344 switch (exid->spa_how) {
1345 case SP4_NONE:
1346 break;
1347 case SP4_MACH_CRED:
1348 /* spo_must_enforce */
1349 status = nfsd4_decode_bitmap(argp,
1350 exid->spo_must_enforce);
1351 if (status)
1352 goto out;
1353 /* spo_must_allow */
1354 status = nfsd4_decode_bitmap(argp, exid->spo_must_allow);
1355 if (status)
1356 goto out;
1357 break;
1358 case SP4_SSV:
1359 /* ssp_ops */
1360 READ_BUF(4);
1361 dummy = be32_to_cpup(p++);
1362 READ_BUF(dummy * 4);
1363 p += dummy;
1364
1365 READ_BUF(4);
1366 dummy = be32_to_cpup(p++);
1367 READ_BUF(dummy * 4);
1368 p += dummy;
1369
1370 /* ssp_hash_algs<> */
1371 READ_BUF(4);
1372 tmp = be32_to_cpup(p++);
1373 while (tmp--) {
1374 READ_BUF(4);
1375 dummy = be32_to_cpup(p++);
1376 READ_BUF(dummy);
1377 p += XDR_QUADLEN(dummy);
1378 }
1379
1380 /* ssp_encr_algs<> */
1381 READ_BUF(4);
1382 tmp = be32_to_cpup(p++);
1383 while (tmp--) {
1384 READ_BUF(4);
1385 dummy = be32_to_cpup(p++);
1386 READ_BUF(dummy);
1387 p += XDR_QUADLEN(dummy);
1388 }
1389
1390 /* ssp_window and ssp_num_gss_handles */
1391 READ_BUF(8);
1392 dummy = be32_to_cpup(p++);
1393 dummy = be32_to_cpup(p++);
1394 break;
1395 default:
1396 goto xdr_error;
1397 }
1398
1399 /* Ignore Implementation ID */
1400 READ_BUF(4); /* nfs_impl_id4 array length */
1401 dummy = be32_to_cpup(p++);
1402
1403 if (dummy > 1)
1404 goto xdr_error;
1405
1406 if (dummy == 1) {
1407 /* nii_domain */
1408 READ_BUF(4);
1409 dummy = be32_to_cpup(p++);
1410 READ_BUF(dummy);
1411 p += XDR_QUADLEN(dummy);
1412
1413 /* nii_name */
1414 READ_BUF(4);
1415 dummy = be32_to_cpup(p++);
1416 READ_BUF(dummy);
1417 p += XDR_QUADLEN(dummy);
1418
1419 /* nii_date */
1420 READ_BUF(12);
1421 p += 3;
1422 }
1423 DECODE_TAIL;
1424}
1425
1426static __be32
1427nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1428 struct nfsd4_create_session *sess)
1429{
1430 DECODE_HEAD;
1431 u32 dummy;
1432
1433 READ_BUF(16);
1434 COPYMEM(&sess->clientid, 8);
1435 sess->seqid = be32_to_cpup(p++);
1436 sess->flags = be32_to_cpup(p++);
1437
1438 /* Fore channel attrs */
1439 READ_BUF(28);
1440 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1441 sess->fore_channel.maxreq_sz = be32_to_cpup(p++);
1442 sess->fore_channel.maxresp_sz = be32_to_cpup(p++);
1443 sess->fore_channel.maxresp_cached = be32_to_cpup(p++);
1444 sess->fore_channel.maxops = be32_to_cpup(p++);
1445 sess->fore_channel.maxreqs = be32_to_cpup(p++);
1446 sess->fore_channel.nr_rdma_attrs = be32_to_cpup(p++);
1447 if (sess->fore_channel.nr_rdma_attrs == 1) {
1448 READ_BUF(4);
1449 sess->fore_channel.rdma_attrs = be32_to_cpup(p++);
1450 } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1451 dprintk("Too many fore channel attr bitmaps!\n");
1452 goto xdr_error;
1453 }
1454
1455 /* Back channel attrs */
1456 READ_BUF(28);
1457 dummy = be32_to_cpup(p++); /* headerpadsz is always 0 */
1458 sess->back_channel.maxreq_sz = be32_to_cpup(p++);
1459 sess->back_channel.maxresp_sz = be32_to_cpup(p++);
1460 sess->back_channel.maxresp_cached = be32_to_cpup(p++);
1461 sess->back_channel.maxops = be32_to_cpup(p++);
1462 sess->back_channel.maxreqs = be32_to_cpup(p++);
1463 sess->back_channel.nr_rdma_attrs = be32_to_cpup(p++);
1464 if (sess->back_channel.nr_rdma_attrs == 1) {
1465 READ_BUF(4);
1466 sess->back_channel.rdma_attrs = be32_to_cpup(p++);
1467 } else if (sess->back_channel.nr_rdma_attrs > 1) {
1468 dprintk("Too many back channel attr bitmaps!\n");
1469 goto xdr_error;
1470 }
1471
1472 READ_BUF(4);
1473 sess->callback_prog = be32_to_cpup(p++);
1474 nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1475 DECODE_TAIL;
1476}
1477
1478static __be32
1479nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1480 struct nfsd4_destroy_session *destroy_session)
1481{
1482 DECODE_HEAD;
1483 READ_BUF(NFS4_MAX_SESSIONID_LEN);
1484 COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1485
1486 DECODE_TAIL;
1487}
1488
1489static __be32
1490nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1491 struct nfsd4_free_stateid *free_stateid)
1492{
1493 DECODE_HEAD;
1494
1495 READ_BUF(sizeof(stateid_t));
1496 free_stateid->fr_stateid.si_generation = be32_to_cpup(p++);
1497 COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1498
1499 DECODE_TAIL;
1500}
1501
1502static __be32
1503nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1504 struct nfsd4_sequence *seq)
1505{
1506 DECODE_HEAD;
1507
1508 READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1509 COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1510 seq->seqid = be32_to_cpup(p++);
1511 seq->slotid = be32_to_cpup(p++);
1512 seq->maxslots = be32_to_cpup(p++);
1513 seq->cachethis = be32_to_cpup(p++);
1514
1515 DECODE_TAIL;
1516}
1517
1518static __be32
1519nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1520{
1521 int i;
1522 __be32 *p, status;
1523 struct nfsd4_test_stateid_id *stateid;
1524
1525 READ_BUF(4);
1526 test_stateid->ts_num_ids = ntohl(*p++);
1527
1528 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1529
1530 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1531 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1532 if (!stateid) {
1533 status = nfserrno(-ENOMEM);
1534 goto out;
1535 }
1536
1537 INIT_LIST_HEAD(&stateid->ts_id_list);
1538 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1539
1540 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1541 if (status)
1542 goto out;
1543 }
1544
1545 status = 0;
1546out:
1547 return status;
1548xdr_error:
1549 dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1550 status = nfserr_bad_xdr;
1551 goto out;
1552}
1553
1554static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1555{
1556 DECODE_HEAD;
1557
1558 READ_BUF(8);
1559 COPYMEM(&dc->clientid, 8);
1560
1561 DECODE_TAIL;
1562}
1563
1564static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1565{
1566 DECODE_HEAD;
1567
1568 READ_BUF(4);
1569 rc->rca_one_fs = be32_to_cpup(p++);
1570
1571 DECODE_TAIL;
1572}
1573
1574#ifdef CONFIG_NFSD_PNFS
1575static __be32
1576nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1577 struct nfsd4_getdeviceinfo *gdev)
1578{
1579 DECODE_HEAD;
1580 u32 num, i;
1581
1582 READ_BUF(sizeof(struct nfsd4_deviceid) + 3 * 4);
1583 COPYMEM(&gdev->gd_devid, sizeof(struct nfsd4_deviceid));
1584 gdev->gd_layout_type = be32_to_cpup(p++);
1585 gdev->gd_maxcount = be32_to_cpup(p++);
1586 num = be32_to_cpup(p++);
1587 if (num) {
1588 READ_BUF(4 * num);
1589 gdev->gd_notify_types = be32_to_cpup(p++);
1590 for (i = 1; i < num; i++) {
1591 if (be32_to_cpup(p++)) {
1592 status = nfserr_inval;
1593 goto out;
1594 }
1595 }
1596 }
1597 DECODE_TAIL;
1598}
1599
1600static __be32
1601nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1602 struct nfsd4_layoutget *lgp)
1603{
1604 DECODE_HEAD;
1605
1606 READ_BUF(36);
1607 lgp->lg_signal = be32_to_cpup(p++);
1608 lgp->lg_layout_type = be32_to_cpup(p++);
1609 lgp->lg_seg.iomode = be32_to_cpup(p++);
1610 p = xdr_decode_hyper(p, &lgp->lg_seg.offset);
1611 p = xdr_decode_hyper(p, &lgp->lg_seg.length);
1612 p = xdr_decode_hyper(p, &lgp->lg_minlength);
1613
1614 status = nfsd4_decode_stateid(argp, &lgp->lg_sid);
1615 if (status)
1616 return status;
1617
1618 READ_BUF(4);
1619 lgp->lg_maxcount = be32_to_cpup(p++);
1620
1621 DECODE_TAIL;
1622}
1623
1624static __be32
1625nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1626 struct nfsd4_layoutcommit *lcp)
1627{
1628 DECODE_HEAD;
1629 u32 timechange;
1630
1631 READ_BUF(20);
1632 p = xdr_decode_hyper(p, &lcp->lc_seg.offset);
1633 p = xdr_decode_hyper(p, &lcp->lc_seg.length);
1634 lcp->lc_reclaim = be32_to_cpup(p++);
1635
1636 status = nfsd4_decode_stateid(argp, &lcp->lc_sid);
1637 if (status)
1638 return status;
1639
1640 READ_BUF(4);
1641 lcp->lc_newoffset = be32_to_cpup(p++);
1642 if (lcp->lc_newoffset) {
1643 READ_BUF(8);
1644 p = xdr_decode_hyper(p, &lcp->lc_last_wr);
1645 } else
1646 lcp->lc_last_wr = 0;
1647 READ_BUF(4);
1648 timechange = be32_to_cpup(p++);
1649 if (timechange) {
1650 status = nfsd4_decode_time(argp, &lcp->lc_mtime);
1651 if (status)
1652 return status;
1653 } else {
1654 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1655 }
1656 READ_BUF(8);
1657 lcp->lc_layout_type = be32_to_cpup(p++);
1658
1659 /*
1660 * Save the layout update in XDR format and let the layout driver deal
1661 * with it later.
1662 */
1663 lcp->lc_up_len = be32_to_cpup(p++);
1664 if (lcp->lc_up_len > 0) {
1665 READ_BUF(lcp->lc_up_len);
1666 READMEM(lcp->lc_up_layout, lcp->lc_up_len);
1667 }
1668
1669 DECODE_TAIL;
1670}
1671
1672static __be32
1673nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1674 struct nfsd4_layoutreturn *lrp)
1675{
1676 DECODE_HEAD;
1677
1678 READ_BUF(16);
1679 lrp->lr_reclaim = be32_to_cpup(p++);
1680 lrp->lr_layout_type = be32_to_cpup(p++);
1681 lrp->lr_seg.iomode = be32_to_cpup(p++);
1682 lrp->lr_return_type = be32_to_cpup(p++);
1683 if (lrp->lr_return_type == RETURN_FILE) {
1684 READ_BUF(16);
1685 p = xdr_decode_hyper(p, &lrp->lr_seg.offset);
1686 p = xdr_decode_hyper(p, &lrp->lr_seg.length);
1687
1688 status = nfsd4_decode_stateid(argp, &lrp->lr_sid);
1689 if (status)
1690 return status;
1691
1692 READ_BUF(4);
1693 lrp->lrf_body_len = be32_to_cpup(p++);
1694 if (lrp->lrf_body_len > 0) {
1695 READ_BUF(lrp->lrf_body_len);
1696 READMEM(lrp->lrf_body, lrp->lrf_body_len);
1697 }
1698 } else {
1699 lrp->lr_seg.offset = 0;
1700 lrp->lr_seg.length = NFS4_MAX_UINT64;
1701 }
1702
1703 DECODE_TAIL;
1704}
1705#endif /* CONFIG_NFSD_PNFS */
1706
1707static __be32
1708nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1709 struct nfsd4_fallocate *fallocate)
1710{
1711 DECODE_HEAD;
1712
1713 status = nfsd4_decode_stateid(argp, &fallocate->falloc_stateid);
1714 if (status)
1715 return status;
1716
1717 READ_BUF(16);
1718 p = xdr_decode_hyper(p, &fallocate->falloc_offset);
1719 xdr_decode_hyper(p, &fallocate->falloc_length);
1720
1721 DECODE_TAIL;
1722}
1723
1724static __be32
1725nfsd4_decode_clone(struct nfsd4_compoundargs *argp, struct nfsd4_clone *clone)
1726{
1727 DECODE_HEAD;
1728
1729 status = nfsd4_decode_stateid(argp, &clone->cl_src_stateid);
1730 if (status)
1731 return status;
1732 status = nfsd4_decode_stateid(argp, &clone->cl_dst_stateid);
1733 if (status)
1734 return status;
1735
1736 READ_BUF(8 + 8 + 8);
1737 p = xdr_decode_hyper(p, &clone->cl_src_pos);
1738 p = xdr_decode_hyper(p, &clone->cl_dst_pos);
1739 p = xdr_decode_hyper(p, &clone->cl_count);
1740 DECODE_TAIL;
1741}
1742
1743static __be32
1744nfsd4_decode_copy(struct nfsd4_compoundargs *argp, struct nfsd4_copy *copy)
1745{
1746 DECODE_HEAD;
1747 unsigned int tmp;
1748
1749 status = nfsd4_decode_stateid(argp, ©->cp_src_stateid);
1750 if (status)
1751 return status;
1752 status = nfsd4_decode_stateid(argp, ©->cp_dst_stateid);
1753 if (status)
1754 return status;
1755
1756 READ_BUF(8 + 8 + 8 + 4 + 4 + 4);
1757 p = xdr_decode_hyper(p, ©->cp_src_pos);
1758 p = xdr_decode_hyper(p, ©->cp_dst_pos);
1759 p = xdr_decode_hyper(p, ©->cp_count);
1760 p++; /* ca_consecutive: we always do consecutive copies */
1761 copy->cp_synchronous = be32_to_cpup(p++);
1762 tmp = be32_to_cpup(p); /* Source server list not supported */
1763
1764 DECODE_TAIL;
1765}
1766
1767static __be32
1768nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek)
1769{
1770 DECODE_HEAD;
1771
1772 status = nfsd4_decode_stateid(argp, &seek->seek_stateid);
1773 if (status)
1774 return status;
1775
1776 READ_BUF(8 + 4);
1777 p = xdr_decode_hyper(p, &seek->seek_offset);
1778 seek->seek_whence = be32_to_cpup(p);
1779
1780 DECODE_TAIL;
1781}
1782
1783static __be32
1784nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1785{
1786 return nfs_ok;
1787}
1788
1789static __be32
1790nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1791{
1792 return nfserr_notsupp;
1793}
1794
1795typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1796
1797static const nfsd4_dec nfsd4_dec_ops[] = {
1798 [OP_ACCESS] = (nfsd4_dec)nfsd4_decode_access,
1799 [OP_CLOSE] = (nfsd4_dec)nfsd4_decode_close,
1800 [OP_COMMIT] = (nfsd4_dec)nfsd4_decode_commit,
1801 [OP_CREATE] = (nfsd4_dec)nfsd4_decode_create,
1802 [OP_DELEGPURGE] = (nfsd4_dec)nfsd4_decode_notsupp,
1803 [OP_DELEGRETURN] = (nfsd4_dec)nfsd4_decode_delegreturn,
1804 [OP_GETATTR] = (nfsd4_dec)nfsd4_decode_getattr,
1805 [OP_GETFH] = (nfsd4_dec)nfsd4_decode_noop,
1806 [OP_LINK] = (nfsd4_dec)nfsd4_decode_link,
1807 [OP_LOCK] = (nfsd4_dec)nfsd4_decode_lock,
1808 [OP_LOCKT] = (nfsd4_dec)nfsd4_decode_lockt,
1809 [OP_LOCKU] = (nfsd4_dec)nfsd4_decode_locku,
1810 [OP_LOOKUP] = (nfsd4_dec)nfsd4_decode_lookup,
1811 [OP_LOOKUPP] = (nfsd4_dec)nfsd4_decode_noop,
1812 [OP_NVERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1813 [OP_OPEN] = (nfsd4_dec)nfsd4_decode_open,
1814 [OP_OPENATTR] = (nfsd4_dec)nfsd4_decode_notsupp,
1815 [OP_OPEN_CONFIRM] = (nfsd4_dec)nfsd4_decode_open_confirm,
1816 [OP_OPEN_DOWNGRADE] = (nfsd4_dec)nfsd4_decode_open_downgrade,
1817 [OP_PUTFH] = (nfsd4_dec)nfsd4_decode_putfh,
1818 [OP_PUTPUBFH] = (nfsd4_dec)nfsd4_decode_putpubfh,
1819 [OP_PUTROOTFH] = (nfsd4_dec)nfsd4_decode_noop,
1820 [OP_READ] = (nfsd4_dec)nfsd4_decode_read,
1821 [OP_READDIR] = (nfsd4_dec)nfsd4_decode_readdir,
1822 [OP_READLINK] = (nfsd4_dec)nfsd4_decode_noop,
1823 [OP_REMOVE] = (nfsd4_dec)nfsd4_decode_remove,
1824 [OP_RENAME] = (nfsd4_dec)nfsd4_decode_rename,
1825 [OP_RENEW] = (nfsd4_dec)nfsd4_decode_renew,
1826 [OP_RESTOREFH] = (nfsd4_dec)nfsd4_decode_noop,
1827 [OP_SAVEFH] = (nfsd4_dec)nfsd4_decode_noop,
1828 [OP_SECINFO] = (nfsd4_dec)nfsd4_decode_secinfo,
1829 [OP_SETATTR] = (nfsd4_dec)nfsd4_decode_setattr,
1830 [OP_SETCLIENTID] = (nfsd4_dec)nfsd4_decode_setclientid,
1831 [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1832 [OP_VERIFY] = (nfsd4_dec)nfsd4_decode_verify,
1833 [OP_WRITE] = (nfsd4_dec)nfsd4_decode_write,
1834 [OP_RELEASE_LOCKOWNER] = (nfsd4_dec)nfsd4_decode_release_lockowner,
1835
1836 /* new operations for NFSv4.1 */
1837 [OP_BACKCHANNEL_CTL] = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1838 [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1839 [OP_EXCHANGE_ID] = (nfsd4_dec)nfsd4_decode_exchange_id,
1840 [OP_CREATE_SESSION] = (nfsd4_dec)nfsd4_decode_create_session,
1841 [OP_DESTROY_SESSION] = (nfsd4_dec)nfsd4_decode_destroy_session,
1842 [OP_FREE_STATEID] = (nfsd4_dec)nfsd4_decode_free_stateid,
1843 [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1844#ifdef CONFIG_NFSD_PNFS
1845 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_getdeviceinfo,
1846 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1847 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_layoutcommit,
1848 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_layoutget,
1849 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_layoutreturn,
1850#else
1851 [OP_GETDEVICEINFO] = (nfsd4_dec)nfsd4_decode_notsupp,
1852 [OP_GETDEVICELIST] = (nfsd4_dec)nfsd4_decode_notsupp,
1853 [OP_LAYOUTCOMMIT] = (nfsd4_dec)nfsd4_decode_notsupp,
1854 [OP_LAYOUTGET] = (nfsd4_dec)nfsd4_decode_notsupp,
1855 [OP_LAYOUTRETURN] = (nfsd4_dec)nfsd4_decode_notsupp,
1856#endif
1857 [OP_SECINFO_NO_NAME] = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1858 [OP_SEQUENCE] = (nfsd4_dec)nfsd4_decode_sequence,
1859 [OP_SET_SSV] = (nfsd4_dec)nfsd4_decode_notsupp,
1860 [OP_TEST_STATEID] = (nfsd4_dec)nfsd4_decode_test_stateid,
1861 [OP_WANT_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1862 [OP_DESTROY_CLIENTID] = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1863 [OP_RECLAIM_COMPLETE] = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1864
1865 /* new operations for NFSv4.2 */
1866 [OP_ALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1867 [OP_COPY] = (nfsd4_dec)nfsd4_decode_copy,
1868 [OP_COPY_NOTIFY] = (nfsd4_dec)nfsd4_decode_notsupp,
1869 [OP_DEALLOCATE] = (nfsd4_dec)nfsd4_decode_fallocate,
1870 [OP_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp,
1871 [OP_LAYOUTERROR] = (nfsd4_dec)nfsd4_decode_notsupp,
1872 [OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
1873 [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
1874 [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1875 [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
1876 [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
1877 [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
1878 [OP_CLONE] = (nfsd4_dec)nfsd4_decode_clone,
1879};
1880
1881static inline bool
1882nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
1883{
1884 if (op->opnum < FIRST_NFS4_OP)
1885 return false;
1886 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
1887 return false;
1888 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
1889 return false;
1890 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
1891 return false;
1892 return true;
1893}
1894
1895static __be32
1896nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1897{
1898 DECODE_HEAD;
1899 struct nfsd4_op *op;
1900 bool cachethis = false;
1901 int auth_slack= argp->rqstp->rq_auth_slack;
1902 int max_reply = auth_slack + 8; /* opcnt, status */
1903 int readcount = 0;
1904 int readbytes = 0;
1905 int i;
1906
1907 READ_BUF(4);
1908 argp->taglen = be32_to_cpup(p++);
1909 READ_BUF(argp->taglen);
1910 SAVEMEM(argp->tag, argp->taglen);
1911 READ_BUF(8);
1912 argp->minorversion = be32_to_cpup(p++);
1913 argp->opcnt = be32_to_cpup(p++);
1914 max_reply += 4 + (XDR_QUADLEN(argp->taglen) << 2);
1915
1916 if (argp->taglen > NFSD4_MAX_TAGLEN)
1917 goto xdr_error;
1918 /*
1919 * NFS4ERR_RESOURCE is a more helpful error than GARBAGE_ARGS
1920 * here, so we return success at the xdr level so that
1921 * nfsd4_proc can handle this is an NFS-level error.
1922 */
1923 if (argp->opcnt > NFSD_MAX_OPS_PER_COMPOUND)
1924 return 0;
1925
1926 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1927 argp->ops = kzalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1928 if (!argp->ops) {
1929 argp->ops = argp->iops;
1930 dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1931 goto xdr_error;
1932 }
1933 }
1934
1935 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
1936 argp->opcnt = 0;
1937
1938 for (i = 0; i < argp->opcnt; i++) {
1939 op = &argp->ops[i];
1940 op->replay = NULL;
1941
1942 READ_BUF(4);
1943 op->opnum = be32_to_cpup(p++);
1944
1945 if (nfsd4_opnum_in_range(argp, op))
1946 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
1947 else {
1948 op->opnum = OP_ILLEGAL;
1949 op->status = nfserr_op_illegal;
1950 }
1951 op->opdesc = OPDESC(op);
1952 /*
1953 * We'll try to cache the result in the DRC if any one
1954 * op in the compound wants to be cached:
1955 */
1956 cachethis |= nfsd4_cache_this_op(op);
1957
1958 if (op->opnum == OP_READ) {
1959 readcount++;
1960 readbytes += nfsd4_max_reply(argp->rqstp, op);
1961 } else
1962 max_reply += nfsd4_max_reply(argp->rqstp, op);
1963 /*
1964 * OP_LOCK and OP_LOCKT may return a conflicting lock.
1965 * (Special case because it will just skip encoding this
1966 * if it runs out of xdr buffer space, and it is the only
1967 * operation that behaves this way.)
1968 */
1969 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
1970 max_reply += NFS4_OPAQUE_LIMIT;
1971
1972 if (op->status) {
1973 argp->opcnt = i+1;
1974 break;
1975 }
1976 }
1977 /* Sessions make the DRC unnecessary: */
1978 if (argp->minorversion)
1979 cachethis = false;
1980 svc_reserve(argp->rqstp, max_reply + readbytes);
1981 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1982
1983 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
1984 clear_bit(RQ_SPLICE_OK, &argp->rqstp->rq_flags);
1985
1986 DECODE_TAIL;
1987}
1988
1989static __be32 *encode_change(__be32 *p, struct kstat *stat, struct inode *inode,
1990 struct svc_export *exp)
1991{
1992 if (exp->ex_flags & NFSEXP_V4ROOT) {
1993 *p++ = cpu_to_be32(convert_to_wallclock(exp->cd->flush_time));
1994 *p++ = 0;
1995 } else if (IS_I_VERSION(inode)) {
1996 p = xdr_encode_hyper(p, nfsd4_change_attribute(stat, inode));
1997 } else {
1998 *p++ = cpu_to_be32(stat->ctime.tv_sec);
1999 *p++ = cpu_to_be32(stat->ctime.tv_nsec);
2000 }
2001 return p;
2002}
2003
2004static __be32 *encode_cinfo(__be32 *p, struct nfsd4_change_info *c)
2005{
2006 *p++ = cpu_to_be32(c->atomic);
2007 if (c->change_supported) {
2008 p = xdr_encode_hyper(p, c->before_change);
2009 p = xdr_encode_hyper(p, c->after_change);
2010 } else {
2011 *p++ = cpu_to_be32(c->before_ctime_sec);
2012 *p++ = cpu_to_be32(c->before_ctime_nsec);
2013 *p++ = cpu_to_be32(c->after_ctime_sec);
2014 *p++ = cpu_to_be32(c->after_ctime_nsec);
2015 }
2016 return p;
2017}
2018
2019/* Encode as an array of strings the string given with components
2020 * separated @sep, escaped with esc_enter and esc_exit.
2021 */
2022static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2023 char *components, char esc_enter,
2024 char esc_exit)
2025{
2026 __be32 *p;
2027 __be32 pathlen;
2028 int pathlen_offset;
2029 int strlen, count=0;
2030 char *str, *end, *next;
2031
2032 dprintk("nfsd4_encode_components(%s)\n", components);
2033
2034 pathlen_offset = xdr->buf->len;
2035 p = xdr_reserve_space(xdr, 4);
2036 if (!p)
2037 return nfserr_resource;
2038 p++; /* We will fill this in with @count later */
2039
2040 end = str = components;
2041 while (*end) {
2042 bool found_esc = false;
2043
2044 /* try to parse as esc_start, ..., esc_end, sep */
2045 if (*str == esc_enter) {
2046 for (; *end && (*end != esc_exit); end++)
2047 /* find esc_exit or end of string */;
2048 next = end + 1;
2049 if (*end && (!*next || *next == sep)) {
2050 str++;
2051 found_esc = true;
2052 }
2053 }
2054
2055 if (!found_esc)
2056 for (; *end && (*end != sep); end++)
2057 /* find sep or end of string */;
2058
2059 strlen = end - str;
2060 if (strlen) {
2061 p = xdr_reserve_space(xdr, strlen + 4);
2062 if (!p)
2063 return nfserr_resource;
2064 p = xdr_encode_opaque(p, str, strlen);
2065 count++;
2066 }
2067 else
2068 end++;
2069 if (found_esc)
2070 end = next;
2071
2072 str = end;
2073 }
2074 pathlen = htonl(count);
2075 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2076 return 0;
2077}
2078
2079/* Encode as an array of strings the string given with components
2080 * separated @sep.
2081 */
2082static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2083 char *components)
2084{
2085 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2086}
2087
2088/*
2089 * encode a location element of a fs_locations structure
2090 */
2091static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2092 struct nfsd4_fs_location *location)
2093{
2094 __be32 status;
2095
2096 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2097 '[', ']');
2098 if (status)
2099 return status;
2100 status = nfsd4_encode_components(xdr, '/', location->path);
2101 if (status)
2102 return status;
2103 return 0;
2104}
2105
2106/*
2107 * Encode a path in RFC3530 'pathname4' format
2108 */
2109static __be32 nfsd4_encode_path(struct xdr_stream *xdr,
2110 const struct path *root,
2111 const struct path *path)
2112{
2113 struct path cur = *path;
2114 __be32 *p;
2115 struct dentry **components = NULL;
2116 unsigned int ncomponents = 0;
2117 __be32 err = nfserr_jukebox;
2118
2119 dprintk("nfsd4_encode_components(");
2120
2121 path_get(&cur);
2122 /* First walk the path up to the nfsd root, and store the
2123 * dentries/path components in an array.
2124 */
2125 for (;;) {
2126 if (path_equal(&cur, root))
2127 break;
2128 if (cur.dentry == cur.mnt->mnt_root) {
2129 if (follow_up(&cur))
2130 continue;
2131 goto out_free;
2132 }
2133 if ((ncomponents & 15) == 0) {
2134 struct dentry **new;
2135 new = krealloc(components,
2136 sizeof(*new) * (ncomponents + 16),
2137 GFP_KERNEL);
2138 if (!new)
2139 goto out_free;
2140 components = new;
2141 }
2142 components[ncomponents++] = cur.dentry;
2143 cur.dentry = dget_parent(cur.dentry);
2144 }
2145 err = nfserr_resource;
2146 p = xdr_reserve_space(xdr, 4);
2147 if (!p)
2148 goto out_free;
2149 *p++ = cpu_to_be32(ncomponents);
2150
2151 while (ncomponents) {
2152 struct dentry *dentry = components[ncomponents - 1];
2153 unsigned int len;
2154
2155 spin_lock(&dentry->d_lock);
2156 len = dentry->d_name.len;
2157 p = xdr_reserve_space(xdr, len + 4);
2158 if (!p) {
2159 spin_unlock(&dentry->d_lock);
2160 goto out_free;
2161 }
2162 p = xdr_encode_opaque(p, dentry->d_name.name, len);
2163 dprintk("/%pd", dentry);
2164 spin_unlock(&dentry->d_lock);
2165 dput(dentry);
2166 ncomponents--;
2167 }
2168
2169 err = 0;
2170out_free:
2171 dprintk(")\n");
2172 while (ncomponents)
2173 dput(components[--ncomponents]);
2174 kfree(components);
2175 path_put(&cur);
2176 return err;
2177}
2178
2179static __be32 nfsd4_encode_fsloc_fsroot(struct xdr_stream *xdr,
2180 struct svc_rqst *rqstp, const struct path *path)
2181{
2182 struct svc_export *exp_ps;
2183 __be32 res;
2184
2185 exp_ps = rqst_find_fsidzero_export(rqstp);
2186 if (IS_ERR(exp_ps))
2187 return nfserrno(PTR_ERR(exp_ps));
2188 res = nfsd4_encode_path(xdr, &exp_ps->ex_path, path);
2189 exp_put(exp_ps);
2190 return res;
2191}
2192
2193/*
2194 * encode a fs_locations structure
2195 */
2196static __be32 nfsd4_encode_fs_locations(struct xdr_stream *xdr,
2197 struct svc_rqst *rqstp, struct svc_export *exp)
2198{
2199 __be32 status;
2200 int i;
2201 __be32 *p;
2202 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2203
2204 status = nfsd4_encode_fsloc_fsroot(xdr, rqstp, &exp->ex_path);
2205 if (status)
2206 return status;
2207 p = xdr_reserve_space(xdr, 4);
2208 if (!p)
2209 return nfserr_resource;
2210 *p++ = cpu_to_be32(fslocs->locations_count);
2211 for (i=0; i<fslocs->locations_count; i++) {
2212 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2213 if (status)
2214 return status;
2215 }
2216 return 0;
2217}
2218
2219static u32 nfs4_file_type(umode_t mode)
2220{
2221 switch (mode & S_IFMT) {
2222 case S_IFIFO: return NF4FIFO;
2223 case S_IFCHR: return NF4CHR;
2224 case S_IFDIR: return NF4DIR;
2225 case S_IFBLK: return NF4BLK;
2226 case S_IFLNK: return NF4LNK;
2227 case S_IFREG: return NF4REG;
2228 case S_IFSOCK: return NF4SOCK;
2229 default: return NF4BAD;
2230 };
2231}
2232
2233static inline __be32
2234nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2235 struct nfs4_ace *ace)
2236{
2237 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2238 return nfs4_acl_write_who(xdr, ace->whotype);
2239 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2240 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2241 else
2242 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2243}
2244
2245static inline __be32
2246nfsd4_encode_layout_types(struct xdr_stream *xdr, u32 layout_types)
2247{
2248 __be32 *p;
2249 unsigned long i = hweight_long(layout_types);
2250
2251 p = xdr_reserve_space(xdr, 4 + 4 * i);
2252 if (!p)
2253 return nfserr_resource;
2254
2255 *p++ = cpu_to_be32(i);
2256
2257 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
2258 if (layout_types & (1 << i))
2259 *p++ = cpu_to_be32(i);
2260
2261 return 0;
2262}
2263
2264#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2265 FATTR4_WORD0_RDATTR_ERROR)
2266#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2267#define WORD2_ABSENT_FS_ATTRS 0
2268
2269#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2270static inline __be32
2271nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2272 void *context, int len)
2273{
2274 __be32 *p;
2275
2276 p = xdr_reserve_space(xdr, len + 4 + 4 + 4);
2277 if (!p)
2278 return nfserr_resource;
2279
2280 /*
2281 * For now we use a 0 here to indicate the null translation; in
2282 * the future we may place a call to translation code here.
2283 */
2284 *p++ = cpu_to_be32(0); /* lfs */
2285 *p++ = cpu_to_be32(0); /* pi */
2286 p = xdr_encode_opaque(p, context, len);
2287 return 0;
2288}
2289#else
2290static inline __be32
2291nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2292 void *context, int len)
2293{ return 0; }
2294#endif
2295
2296static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2297{
2298 /* As per referral draft: */
2299 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2300 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2301 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2302 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2303 *rdattr_err = NFSERR_MOVED;
2304 else
2305 return nfserr_moved;
2306 }
2307 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2308 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2309 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2310 return 0;
2311}
2312
2313
2314static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2315{
2316 struct path path = exp->ex_path;
2317 int err;
2318
2319 path_get(&path);
2320 while (follow_up(&path)) {
2321 if (path.dentry != path.mnt->mnt_root)
2322 break;
2323 }
2324 err = vfs_getattr(&path, stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2325 path_put(&path);
2326 return err;
2327}
2328
2329static __be32
2330nfsd4_encode_bitmap(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2331{
2332 __be32 *p;
2333
2334 if (bmval2) {
2335 p = xdr_reserve_space(xdr, 16);
2336 if (!p)
2337 goto out_resource;
2338 *p++ = cpu_to_be32(3);
2339 *p++ = cpu_to_be32(bmval0);
2340 *p++ = cpu_to_be32(bmval1);
2341 *p++ = cpu_to_be32(bmval2);
2342 } else if (bmval1) {
2343 p = xdr_reserve_space(xdr, 12);
2344 if (!p)
2345 goto out_resource;
2346 *p++ = cpu_to_be32(2);
2347 *p++ = cpu_to_be32(bmval0);
2348 *p++ = cpu_to_be32(bmval1);
2349 } else {
2350 p = xdr_reserve_space(xdr, 8);
2351 if (!p)
2352 goto out_resource;
2353 *p++ = cpu_to_be32(1);
2354 *p++ = cpu_to_be32(bmval0);
2355 }
2356
2357 return 0;
2358out_resource:
2359 return nfserr_resource;
2360}
2361
2362/*
2363 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2364 * ourselves.
2365 */
2366static __be32
2367nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
2368 struct svc_export *exp,
2369 struct dentry *dentry, u32 *bmval,
2370 struct svc_rqst *rqstp, int ignore_crossmnt)
2371{
2372 u32 bmval0 = bmval[0];
2373 u32 bmval1 = bmval[1];
2374 u32 bmval2 = bmval[2];
2375 struct kstat stat;
2376 struct svc_fh *tempfh = NULL;
2377 struct kstatfs statfs;
2378 __be32 *p;
2379 int starting_len = xdr->buf->len;
2380 int attrlen_offset;
2381 __be32 attrlen;
2382 u32 dummy;
2383 u64 dummy64;
2384 u32 rdattr_err = 0;
2385 __be32 status;
2386 int err;
2387 struct nfs4_acl *acl = NULL;
2388 void *context = NULL;
2389 int contextlen;
2390 bool contextsupport = false;
2391 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2392 u32 minorversion = resp->cstate.minorversion;
2393 struct path path = {
2394 .mnt = exp->ex_path.mnt,
2395 .dentry = dentry,
2396 };
2397 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2398
2399 BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2400 BUG_ON(!nfsd_attrs_supported(minorversion, bmval));
2401
2402 if (exp->ex_fslocs.migrated) {
2403 status = fattr_handle_absent_fs(&bmval0, &bmval1, &bmval2, &rdattr_err);
2404 if (status)
2405 goto out;
2406 }
2407
2408 err = vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
2409 if (err)
2410 goto out_nfserr;
2411 if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2412 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2413 (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2414 FATTR4_WORD1_SPACE_TOTAL))) {
2415 err = vfs_statfs(&path, &statfs);
2416 if (err)
2417 goto out_nfserr;
2418 }
2419 if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2420 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
2421 status = nfserr_jukebox;
2422 if (!tempfh)
2423 goto out;
2424 fh_init(tempfh, NFS4_FHSIZE);
2425 status = fh_compose(tempfh, exp, dentry, NULL);
2426 if (status)
2427 goto out;
2428 fhp = tempfh;
2429 }
2430 if (bmval0 & FATTR4_WORD0_ACL) {
2431 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2432 if (err == -EOPNOTSUPP)
2433 bmval0 &= ~FATTR4_WORD0_ACL;
2434 else if (err == -EINVAL) {
2435 status = nfserr_attrnotsupp;
2436 goto out;
2437 } else if (err != 0)
2438 goto out_nfserr;
2439 }
2440
2441#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2442 if ((bmval2 & FATTR4_WORD2_SECURITY_LABEL) ||
2443 bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2444 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
2445 err = security_inode_getsecctx(d_inode(dentry),
2446 &context, &contextlen);
2447 else
2448 err = -EOPNOTSUPP;
2449 contextsupport = (err == 0);
2450 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2451 if (err == -EOPNOTSUPP)
2452 bmval2 &= ~FATTR4_WORD2_SECURITY_LABEL;
2453 else if (err)
2454 goto out_nfserr;
2455 }
2456 }
2457#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2458
2459 status = nfsd4_encode_bitmap(xdr, bmval0, bmval1, bmval2);
2460 if (status)
2461 goto out;
2462
2463 attrlen_offset = xdr->buf->len;
2464 p = xdr_reserve_space(xdr, 4);
2465 if (!p)
2466 goto out_resource;
2467 p++; /* to be backfilled later */
2468
2469 if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2470 u32 supp[3];
2471
2472 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2473
2474 if (!IS_POSIXACL(dentry->d_inode))
2475 supp[0] &= ~FATTR4_WORD0_ACL;
2476 if (!contextsupport)
2477 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2478 if (!supp[2]) {
2479 p = xdr_reserve_space(xdr, 12);
2480 if (!p)
2481 goto out_resource;
2482 *p++ = cpu_to_be32(2);
2483 *p++ = cpu_to_be32(supp[0]);
2484 *p++ = cpu_to_be32(supp[1]);
2485 } else {
2486 p = xdr_reserve_space(xdr, 16);
2487 if (!p)
2488 goto out_resource;
2489 *p++ = cpu_to_be32(3);
2490 *p++ = cpu_to_be32(supp[0]);
2491 *p++ = cpu_to_be32(supp[1]);
2492 *p++ = cpu_to_be32(supp[2]);
2493 }
2494 }
2495 if (bmval0 & FATTR4_WORD0_TYPE) {
2496 p = xdr_reserve_space(xdr, 4);
2497 if (!p)
2498 goto out_resource;
2499 dummy = nfs4_file_type(stat.mode);
2500 if (dummy == NF4BAD) {
2501 status = nfserr_serverfault;
2502 goto out;
2503 }
2504 *p++ = cpu_to_be32(dummy);
2505 }
2506 if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2507 p = xdr_reserve_space(xdr, 4);
2508 if (!p)
2509 goto out_resource;
2510 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2511 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT);
2512 else
2513 *p++ = cpu_to_be32(NFS4_FH_PERSISTENT|
2514 NFS4_FH_VOL_RENAME);
2515 }
2516 if (bmval0 & FATTR4_WORD0_CHANGE) {
2517 p = xdr_reserve_space(xdr, 8);
2518 if (!p)
2519 goto out_resource;
2520 p = encode_change(p, &stat, d_inode(dentry), exp);
2521 }
2522 if (bmval0 & FATTR4_WORD0_SIZE) {
2523 p = xdr_reserve_space(xdr, 8);
2524 if (!p)
2525 goto out_resource;
2526 p = xdr_encode_hyper(p, stat.size);
2527 }
2528 if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2529 p = xdr_reserve_space(xdr, 4);
2530 if (!p)
2531 goto out_resource;
2532 *p++ = cpu_to_be32(1);
2533 }
2534 if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2535 p = xdr_reserve_space(xdr, 4);
2536 if (!p)
2537 goto out_resource;
2538 *p++ = cpu_to_be32(1);
2539 }
2540 if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2541 p = xdr_reserve_space(xdr, 4);
2542 if (!p)
2543 goto out_resource;
2544 *p++ = cpu_to_be32(0);
2545 }
2546 if (bmval0 & FATTR4_WORD0_FSID) {
2547 p = xdr_reserve_space(xdr, 16);
2548 if (!p)
2549 goto out_resource;
2550 if (exp->ex_fslocs.migrated) {
2551 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
2552 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
2553 } else switch(fsid_source(fhp)) {
2554 case FSIDSOURCE_FSID:
2555 p = xdr_encode_hyper(p, (u64)exp->ex_fsid);
2556 p = xdr_encode_hyper(p, (u64)0);
2557 break;
2558 case FSIDSOURCE_DEV:
2559 *p++ = cpu_to_be32(0);
2560 *p++ = cpu_to_be32(MAJOR(stat.dev));
2561 *p++ = cpu_to_be32(0);
2562 *p++ = cpu_to_be32(MINOR(stat.dev));
2563 break;
2564 case FSIDSOURCE_UUID:
2565 p = xdr_encode_opaque_fixed(p, exp->ex_uuid,
2566 EX_UUID_LEN);
2567 break;
2568 }
2569 }
2570 if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2571 p = xdr_reserve_space(xdr, 4);
2572 if (!p)
2573 goto out_resource;
2574 *p++ = cpu_to_be32(0);
2575 }
2576 if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2577 p = xdr_reserve_space(xdr, 4);
2578 if (!p)
2579 goto out_resource;
2580 *p++ = cpu_to_be32(nn->nfsd4_lease);
2581 }
2582 if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2583 p = xdr_reserve_space(xdr, 4);
2584 if (!p)
2585 goto out_resource;
2586 *p++ = cpu_to_be32(rdattr_err);
2587 }
2588 if (bmval0 & FATTR4_WORD0_ACL) {
2589 struct nfs4_ace *ace;
2590
2591 if (acl == NULL) {
2592 p = xdr_reserve_space(xdr, 4);
2593 if (!p)
2594 goto out_resource;
2595
2596 *p++ = cpu_to_be32(0);
2597 goto out_acl;
2598 }
2599 p = xdr_reserve_space(xdr, 4);
2600 if (!p)
2601 goto out_resource;
2602 *p++ = cpu_to_be32(acl->naces);
2603
2604 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2605 p = xdr_reserve_space(xdr, 4*3);
2606 if (!p)
2607 goto out_resource;
2608 *p++ = cpu_to_be32(ace->type);
2609 *p++ = cpu_to_be32(ace->flag);
2610 *p++ = cpu_to_be32(ace->access_mask &
2611 NFS4_ACE_MASK_ALL);
2612 status = nfsd4_encode_aclname(xdr, rqstp, ace);
2613 if (status)
2614 goto out;
2615 }
2616 }
2617out_acl:
2618 if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2619 p = xdr_reserve_space(xdr, 4);
2620 if (!p)
2621 goto out_resource;
2622 *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
2623 ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2624 }
2625 if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2626 p = xdr_reserve_space(xdr, 4);
2627 if (!p)
2628 goto out_resource;
2629 *p++ = cpu_to_be32(1);
2630 }
2631 if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2632 p = xdr_reserve_space(xdr, 4);
2633 if (!p)
2634 goto out_resource;
2635 *p++ = cpu_to_be32(0);
2636 }
2637 if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2638 p = xdr_reserve_space(xdr, 4);
2639 if (!p)
2640 goto out_resource;
2641 *p++ = cpu_to_be32(1);
2642 }
2643 if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2644 p = xdr_reserve_space(xdr, 4);
2645 if (!p)
2646 goto out_resource;
2647 *p++ = cpu_to_be32(1);
2648 }
2649 if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2650 p = xdr_reserve_space(xdr, fhp->fh_handle.fh_size + 4);
2651 if (!p)
2652 goto out_resource;
2653 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base,
2654 fhp->fh_handle.fh_size);
2655 }
2656 if (bmval0 & FATTR4_WORD0_FILEID) {
2657 p = xdr_reserve_space(xdr, 8);
2658 if (!p)
2659 goto out_resource;
2660 p = xdr_encode_hyper(p, stat.ino);
2661 }
2662 if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2663 p = xdr_reserve_space(xdr, 8);
2664 if (!p)
2665 goto out_resource;
2666 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2667 }
2668 if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2669 p = xdr_reserve_space(xdr, 8);
2670 if (!p)
2671 goto out_resource;
2672 p = xdr_encode_hyper(p, (u64) statfs.f_ffree);
2673 }
2674 if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2675 p = xdr_reserve_space(xdr, 8);
2676 if (!p)
2677 goto out_resource;
2678 p = xdr_encode_hyper(p, (u64) statfs.f_files);
2679 }
2680 if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2681 status = nfsd4_encode_fs_locations(xdr, rqstp, exp);
2682 if (status)
2683 goto out;
2684 }
2685 if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2686 p = xdr_reserve_space(xdr, 4);
2687 if (!p)
2688 goto out_resource;
2689 *p++ = cpu_to_be32(1);
2690 }
2691 if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2692 p = xdr_reserve_space(xdr, 8);
2693 if (!p)
2694 goto out_resource;
2695 p = xdr_encode_hyper(p, exp->ex_path.mnt->mnt_sb->s_maxbytes);
2696 }
2697 if (bmval0 & FATTR4_WORD0_MAXLINK) {
2698 p = xdr_reserve_space(xdr, 4);
2699 if (!p)
2700 goto out_resource;
2701 *p++ = cpu_to_be32(255);
2702 }
2703 if (bmval0 & FATTR4_WORD0_MAXNAME) {
2704 p = xdr_reserve_space(xdr, 4);
2705 if (!p)
2706 goto out_resource;
2707 *p++ = cpu_to_be32(statfs.f_namelen);
2708 }
2709 if (bmval0 & FATTR4_WORD0_MAXREAD) {
2710 p = xdr_reserve_space(xdr, 8);
2711 if (!p)
2712 goto out_resource;
2713 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2714 }
2715 if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2716 p = xdr_reserve_space(xdr, 8);
2717 if (!p)
2718 goto out_resource;
2719 p = xdr_encode_hyper(p, (u64) svc_max_payload(rqstp));
2720 }
2721 if (bmval1 & FATTR4_WORD1_MODE) {
2722 p = xdr_reserve_space(xdr, 4);
2723 if (!p)
2724 goto out_resource;
2725 *p++ = cpu_to_be32(stat.mode & S_IALLUGO);
2726 }
2727 if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2728 p = xdr_reserve_space(xdr, 4);
2729 if (!p)
2730 goto out_resource;
2731 *p++ = cpu_to_be32(1);
2732 }
2733 if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2734 p = xdr_reserve_space(xdr, 4);
2735 if (!p)
2736 goto out_resource;
2737 *p++ = cpu_to_be32(stat.nlink);
2738 }
2739 if (bmval1 & FATTR4_WORD1_OWNER) {
2740 status = nfsd4_encode_user(xdr, rqstp, stat.uid);
2741 if (status)
2742 goto out;
2743 }
2744 if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2745 status = nfsd4_encode_group(xdr, rqstp, stat.gid);
2746 if (status)
2747 goto out;
2748 }
2749 if (bmval1 & FATTR4_WORD1_RAWDEV) {
2750 p = xdr_reserve_space(xdr, 8);
2751 if (!p)
2752 goto out_resource;
2753 *p++ = cpu_to_be32((u32) MAJOR(stat.rdev));
2754 *p++ = cpu_to_be32((u32) MINOR(stat.rdev));
2755 }
2756 if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2757 p = xdr_reserve_space(xdr, 8);
2758 if (!p)
2759 goto out_resource;
2760 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2761 p = xdr_encode_hyper(p, dummy64);
2762 }
2763 if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2764 p = xdr_reserve_space(xdr, 8);
2765 if (!p)
2766 goto out_resource;
2767 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2768 p = xdr_encode_hyper(p, dummy64);
2769 }
2770 if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2771 p = xdr_reserve_space(xdr, 8);
2772 if (!p)
2773 goto out_resource;
2774 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2775 p = xdr_encode_hyper(p, dummy64);
2776 }
2777 if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2778 p = xdr_reserve_space(xdr, 8);
2779 if (!p)
2780 goto out_resource;
2781 dummy64 = (u64)stat.blocks << 9;
2782 p = xdr_encode_hyper(p, dummy64);
2783 }
2784 if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2785 p = xdr_reserve_space(xdr, 12);
2786 if (!p)
2787 goto out_resource;
2788 p = xdr_encode_hyper(p, (s64)stat.atime.tv_sec);
2789 *p++ = cpu_to_be32(stat.atime.tv_nsec);
2790 }
2791 if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2792 p = xdr_reserve_space(xdr, 12);
2793 if (!p)
2794 goto out_resource;
2795 *p++ = cpu_to_be32(0);
2796 *p++ = cpu_to_be32(1);
2797 *p++ = cpu_to_be32(0);
2798 }
2799 if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2800 p = xdr_reserve_space(xdr, 12);
2801 if (!p)
2802 goto out_resource;
2803 p = xdr_encode_hyper(p, (s64)stat.ctime.tv_sec);
2804 *p++ = cpu_to_be32(stat.ctime.tv_nsec);
2805 }
2806 if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2807 p = xdr_reserve_space(xdr, 12);
2808 if (!p)
2809 goto out_resource;
2810 p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
2811 *p++ = cpu_to_be32(stat.mtime.tv_nsec);
2812 }
2813 if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2814 struct kstat parent_stat;
2815 u64 ino = stat.ino;
2816
2817 p = xdr_reserve_space(xdr, 8);
2818 if (!p)
2819 goto out_resource;
2820 /*
2821 * Get parent's attributes if not ignoring crossmount
2822 * and this is the root of a cross-mounted filesystem.
2823 */
2824 if (ignore_crossmnt == 0 &&
2825 dentry == exp->ex_path.mnt->mnt_root) {
2826 err = get_parent_attributes(exp, &parent_stat);
2827 if (err)
2828 goto out_nfserr;
2829 ino = parent_stat.ino;
2830 }
2831 p = xdr_encode_hyper(p, ino);
2832 }
2833#ifdef CONFIG_NFSD_PNFS
2834 if (bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) {
2835 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2836 if (status)
2837 goto out;
2838 }
2839
2840 if (bmval2 & FATTR4_WORD2_LAYOUT_TYPES) {
2841 status = nfsd4_encode_layout_types(xdr, exp->ex_layout_types);
2842 if (status)
2843 goto out;
2844 }
2845
2846 if (bmval2 & FATTR4_WORD2_LAYOUT_BLKSIZE) {
2847 p = xdr_reserve_space(xdr, 4);
2848 if (!p)
2849 goto out_resource;
2850 *p++ = cpu_to_be32(stat.blksize);
2851 }
2852#endif /* CONFIG_NFSD_PNFS */
2853 if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2854 u32 supp[3];
2855
2856 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2857 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
2858 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
2859 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
2860
2861 status = nfsd4_encode_bitmap(xdr, supp[0], supp[1], supp[2]);
2862 if (status)
2863 goto out;
2864 }
2865
2866 if (bmval2 & FATTR4_WORD2_SECURITY_LABEL) {
2867 status = nfsd4_encode_security_label(xdr, rqstp, context,
2868 contextlen);
2869 if (status)
2870 goto out;
2871 }
2872
2873 attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
2874 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
2875 status = nfs_ok;
2876
2877out:
2878#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2879 if (context)
2880 security_release_secctx(context, contextlen);
2881#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
2882 kfree(acl);
2883 if (tempfh) {
2884 fh_put(tempfh);
2885 kfree(tempfh);
2886 }
2887 if (status)
2888 xdr_truncate_encode(xdr, starting_len);
2889 return status;
2890out_nfserr:
2891 status = nfserrno(err);
2892 goto out;
2893out_resource:
2894 status = nfserr_resource;
2895 goto out;
2896}
2897
2898static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
2899 struct xdr_buf *buf, __be32 *p, int bytes)
2900{
2901 xdr->scratch.iov_len = 0;
2902 memset(buf, 0, sizeof(struct xdr_buf));
2903 buf->head[0].iov_base = p;
2904 buf->head[0].iov_len = 0;
2905 buf->len = 0;
2906 xdr->buf = buf;
2907 xdr->iov = buf->head;
2908 xdr->p = p;
2909 xdr->end = (void *)p + bytes;
2910 buf->buflen = bytes;
2911}
2912
2913__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
2914 struct svc_fh *fhp, struct svc_export *exp,
2915 struct dentry *dentry, u32 *bmval,
2916 struct svc_rqst *rqstp, int ignore_crossmnt)
2917{
2918 struct xdr_buf dummy;
2919 struct xdr_stream xdr;
2920 __be32 ret;
2921
2922 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
2923 ret = nfsd4_encode_fattr(&xdr, fhp, exp, dentry, bmval, rqstp,
2924 ignore_crossmnt);
2925 *p = xdr.p;
2926 return ret;
2927}
2928
2929static inline int attributes_need_mount(u32 *bmval)
2930{
2931 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2932 return 1;
2933 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2934 return 1;
2935 return 0;
2936}
2937
2938static __be32
2939nfsd4_encode_dirent_fattr(struct xdr_stream *xdr, struct nfsd4_readdir *cd,
2940 const char *name, int namlen)
2941{
2942 struct svc_export *exp = cd->rd_fhp->fh_export;
2943 struct dentry *dentry;
2944 __be32 nfserr;
2945 int ignore_crossmnt = 0;
2946
2947 dentry = lookup_one_len_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
2948 if (IS_ERR(dentry))
2949 return nfserrno(PTR_ERR(dentry));
2950 if (d_really_is_negative(dentry)) {
2951 /*
2952 * we're not holding the i_mutex here, so there's
2953 * a window where this directory entry could have gone
2954 * away.
2955 */
2956 dput(dentry);
2957 return nfserr_noent;
2958 }
2959
2960 exp_get(exp);
2961 /*
2962 * In the case of a mountpoint, the client may be asking for
2963 * attributes that are only properties of the underlying filesystem
2964 * as opposed to the cross-mounted file system. In such a case,
2965 * we will not follow the cross mount and will fill the attribtutes
2966 * directly from the mountpoint dentry.
2967 */
2968 if (nfsd_mountpoint(dentry, exp)) {
2969 int err;
2970
2971 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2972 && !attributes_need_mount(cd->rd_bmval)) {
2973 ignore_crossmnt = 1;
2974 goto out_encode;
2975 }
2976 /*
2977 * Why the heck aren't we just using nfsd_lookup??
2978 * Different "."/".." handling? Something else?
2979 * At least, add a comment here to explain....
2980 */
2981 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2982 if (err) {
2983 nfserr = nfserrno(err);
2984 goto out_put;
2985 }
2986 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2987 if (nfserr)
2988 goto out_put;
2989
2990 }
2991out_encode:
2992 nfserr = nfsd4_encode_fattr(xdr, NULL, exp, dentry, cd->rd_bmval,
2993 cd->rd_rqstp, ignore_crossmnt);
2994out_put:
2995 dput(dentry);
2996 exp_put(exp);
2997 return nfserr;
2998}
2999
3000static __be32 *
3001nfsd4_encode_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3002{
3003 __be32 *p;
3004
3005 p = xdr_reserve_space(xdr, 20);
3006 if (!p)
3007 return NULL;
3008 *p++ = htonl(2);
3009 *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
3010 *p++ = htonl(0); /* bmval1 */
3011
3012 *p++ = htonl(4); /* attribute length */
3013 *p++ = nfserr; /* no htonl */
3014 return p;
3015}
3016
3017static int
3018nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
3019 loff_t offset, u64 ino, unsigned int d_type)
3020{
3021 struct readdir_cd *ccd = ccdv;
3022 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3023 struct xdr_stream *xdr = cd->xdr;
3024 int start_offset = xdr->buf->len;
3025 int cookie_offset;
3026 u32 name_and_cookie;
3027 int entry_bytes;
3028 __be32 nfserr = nfserr_toosmall;
3029 __be64 wire_offset;
3030 __be32 *p;
3031
3032 /* In nfsv4, "." and ".." never make it onto the wire.. */
3033 if (name && isdotent(name, namlen)) {
3034 cd->common.err = nfs_ok;
3035 return 0;
3036 }
3037
3038 if (cd->cookie_offset) {
3039 wire_offset = cpu_to_be64(offset);
3040 write_bytes_to_xdr_buf(xdr->buf, cd->cookie_offset,
3041 &wire_offset, 8);
3042 }
3043
3044 p = xdr_reserve_space(xdr, 4);
3045 if (!p)
3046 goto fail;
3047 *p++ = xdr_one; /* mark entry present */
3048 cookie_offset = xdr->buf->len;
3049 p = xdr_reserve_space(xdr, 3*4 + namlen);
3050 if (!p)
3051 goto fail;
3052 p = xdr_encode_hyper(p, NFS_OFFSET_MAX); /* offset of next entry */
3053 p = xdr_encode_array(p, name, namlen); /* name length & name */
3054
3055 nfserr = nfsd4_encode_dirent_fattr(xdr, cd, name, namlen);
3056 switch (nfserr) {
3057 case nfs_ok:
3058 break;
3059 case nfserr_resource:
3060 nfserr = nfserr_toosmall;
3061 goto fail;
3062 case nfserr_noent:
3063 xdr_truncate_encode(xdr, start_offset);
3064 goto skip_entry;
3065 default:
3066 /*
3067 * If the client requested the RDATTR_ERROR attribute,
3068 * we stuff the error code into this attribute
3069 * and continue. If this attribute was not requested,
3070 * then in accordance with the spec, we fail the
3071 * entire READDIR operation(!)
3072 */
3073 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3074 goto fail;
3075 p = nfsd4_encode_rdattr_error(xdr, nfserr);
3076 if (p == NULL) {
3077 nfserr = nfserr_toosmall;
3078 goto fail;
3079 }
3080 }
3081 nfserr = nfserr_toosmall;
3082 entry_bytes = xdr->buf->len - start_offset;
3083 if (entry_bytes > cd->rd_maxcount)
3084 goto fail;
3085 cd->rd_maxcount -= entry_bytes;
3086 /*
3087 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", so
3088 * let's always let through the first entry, at least:
3089 */
3090 if (!cd->rd_dircount)
3091 goto fail;
3092 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3093 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3094 goto fail;
3095 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3096
3097 cd->cookie_offset = cookie_offset;
3098skip_entry:
3099 cd->common.err = nfs_ok;
3100 return 0;
3101fail:
3102 xdr_truncate_encode(xdr, start_offset);
3103 cd->common.err = nfserr;
3104 return -EINVAL;
3105}
3106
3107static __be32
3108nfsd4_encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
3109{
3110 __be32 *p;
3111
3112 p = xdr_reserve_space(xdr, sizeof(stateid_t));
3113 if (!p)
3114 return nfserr_resource;
3115 *p++ = cpu_to_be32(sid->si_generation);
3116 p = xdr_encode_opaque_fixed(p, &sid->si_opaque,
3117 sizeof(stateid_opaque_t));
3118 return 0;
3119}
3120
3121static __be32
3122nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
3123{
3124 struct xdr_stream *xdr = &resp->xdr;
3125 __be32 *p;
3126
3127 p = xdr_reserve_space(xdr, 8);
3128 if (!p)
3129 return nfserr_resource;
3130 *p++ = cpu_to_be32(access->ac_supported);
3131 *p++ = cpu_to_be32(access->ac_resp_access);
3132 return 0;
3133}
3134
3135static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
3136{
3137 struct xdr_stream *xdr = &resp->xdr;
3138 __be32 *p;
3139
3140 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 8);
3141 if (!p)
3142 return nfserr_resource;
3143 p = xdr_encode_opaque_fixed(p, bcts->sessionid.data,
3144 NFS4_MAX_SESSIONID_LEN);
3145 *p++ = cpu_to_be32(bcts->dir);
3146 /* Upshifting from TCP to RDMA is not supported */
3147 *p++ = cpu_to_be32(0);
3148 return 0;
3149}
3150
3151static __be32
3152nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
3153{
3154 struct xdr_stream *xdr = &resp->xdr;
3155
3156 return nfsd4_encode_stateid(xdr, &close->cl_stateid);
3157}
3158
3159
3160static __be32
3161nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
3162{
3163 struct xdr_stream *xdr = &resp->xdr;
3164 __be32 *p;
3165
3166 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3167 if (!p)
3168 return nfserr_resource;
3169 p = xdr_encode_opaque_fixed(p, commit->co_verf.data,
3170 NFS4_VERIFIER_SIZE);
3171 return 0;
3172}
3173
3174static __be32
3175nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
3176{
3177 struct xdr_stream *xdr = &resp->xdr;
3178 __be32 *p;
3179
3180 p = xdr_reserve_space(xdr, 20);
3181 if (!p)
3182 return nfserr_resource;
3183 encode_cinfo(p, &create->cr_cinfo);
3184 nfserr = nfsd4_encode_bitmap(xdr, create->cr_bmval[0],
3185 create->cr_bmval[1], create->cr_bmval[2]);
3186 return 0;
3187}
3188
3189static __be32
3190nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
3191{
3192 struct svc_fh *fhp = getattr->ga_fhp;
3193 struct xdr_stream *xdr = &resp->xdr;
3194
3195 return nfsd4_encode_fattr(xdr, fhp, fhp->fh_export, fhp->fh_dentry,
3196 getattr->ga_bmval, resp->rqstp, 0);
3197}
3198
3199static __be32
3200nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
3201{
3202 struct xdr_stream *xdr = &resp->xdr;
3203 struct svc_fh *fhp = *fhpp;
3204 unsigned int len;
3205 __be32 *p;
3206
3207 len = fhp->fh_handle.fh_size;
3208 p = xdr_reserve_space(xdr, len + 4);
3209 if (!p)
3210 return nfserr_resource;
3211 p = xdr_encode_opaque(p, &fhp->fh_handle.fh_base, len);
3212 return 0;
3213}
3214
3215/*
3216* Including all fields other than the name, a LOCK4denied structure requires
3217* 8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
3218*/
3219static __be32
3220nfsd4_encode_lock_denied(struct xdr_stream *xdr, struct nfsd4_lock_denied *ld)
3221{
3222 struct xdr_netobj *conf = &ld->ld_owner;
3223 __be32 *p;
3224
3225again:
3226 p = xdr_reserve_space(xdr, 32 + XDR_LEN(conf->len));
3227 if (!p) {
3228 /*
3229 * Don't fail to return the result just because we can't
3230 * return the conflicting open:
3231 */
3232 if (conf->len) {
3233 kfree(conf->data);
3234 conf->len = 0;
3235 conf->data = NULL;
3236 goto again;
3237 }
3238 return nfserr_resource;
3239 }
3240 p = xdr_encode_hyper(p, ld->ld_start);
3241 p = xdr_encode_hyper(p, ld->ld_length);
3242 *p++ = cpu_to_be32(ld->ld_type);
3243 if (conf->len) {
3244 p = xdr_encode_opaque_fixed(p, &ld->ld_clientid, 8);
3245 p = xdr_encode_opaque(p, conf->data, conf->len);
3246 kfree(conf->data);
3247 } else { /* non - nfsv4 lock in conflict, no clientid nor owner */
3248 p = xdr_encode_hyper(p, (u64)0); /* clientid */
3249 *p++ = cpu_to_be32(0); /* length of owner name */
3250 }
3251 return nfserr_denied;
3252}
3253
3254static __be32
3255nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
3256{
3257 struct xdr_stream *xdr = &resp->xdr;
3258
3259 if (!nfserr)
3260 nfserr = nfsd4_encode_stateid(xdr, &lock->lk_resp_stateid);
3261 else if (nfserr == nfserr_denied)
3262 nfserr = nfsd4_encode_lock_denied(xdr, &lock->lk_denied);
3263
3264 return nfserr;
3265}
3266
3267static __be32
3268nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
3269{
3270 struct xdr_stream *xdr = &resp->xdr;
3271
3272 if (nfserr == nfserr_denied)
3273 nfsd4_encode_lock_denied(xdr, &lockt->lt_denied);
3274 return nfserr;
3275}
3276
3277static __be32
3278nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
3279{
3280 struct xdr_stream *xdr = &resp->xdr;
3281
3282 return nfsd4_encode_stateid(xdr, &locku->lu_stateid);
3283}
3284
3285
3286static __be32
3287nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
3288{
3289 struct xdr_stream *xdr = &resp->xdr;
3290 __be32 *p;
3291
3292 p = xdr_reserve_space(xdr, 20);
3293 if (!p)
3294 return nfserr_resource;
3295 p = encode_cinfo(p, &link->li_cinfo);
3296 return 0;
3297}
3298
3299
3300static __be32
3301nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
3302{
3303 struct xdr_stream *xdr = &resp->xdr;
3304 __be32 *p;
3305
3306 nfserr = nfsd4_encode_stateid(xdr, &open->op_stateid);
3307 if (nfserr)
3308 return nfserr;
3309 p = xdr_reserve_space(xdr, 24);
3310 if (!p)
3311 return nfserr_resource;
3312 p = encode_cinfo(p, &open->op_cinfo);
3313 *p++ = cpu_to_be32(open->op_rflags);
3314
3315 nfserr = nfsd4_encode_bitmap(xdr, open->op_bmval[0], open->op_bmval[1],
3316 open->op_bmval[2]);
3317 if (nfserr)
3318 return nfserr;
3319
3320 p = xdr_reserve_space(xdr, 4);
3321 if (!p)
3322 return nfserr_resource;
3323
3324 *p++ = cpu_to_be32(open->op_delegate_type);
3325 switch (open->op_delegate_type) {
3326 case NFS4_OPEN_DELEGATE_NONE:
3327 break;
3328 case NFS4_OPEN_DELEGATE_READ:
3329 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3330 if (nfserr)
3331 return nfserr;
3332 p = xdr_reserve_space(xdr, 20);
3333 if (!p)
3334 return nfserr_resource;
3335 *p++ = cpu_to_be32(open->op_recall);
3336
3337 /*
3338 * TODO: ACE's in delegations
3339 */
3340 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3341 *p++ = cpu_to_be32(0);
3342 *p++ = cpu_to_be32(0);
3343 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3344 break;
3345 case NFS4_OPEN_DELEGATE_WRITE:
3346 nfserr = nfsd4_encode_stateid(xdr, &open->op_delegate_stateid);
3347 if (nfserr)
3348 return nfserr;
3349 p = xdr_reserve_space(xdr, 32);
3350 if (!p)
3351 return nfserr_resource;
3352 *p++ = cpu_to_be32(0);
3353
3354 /*
3355 * TODO: space_limit's in delegations
3356 */
3357 *p++ = cpu_to_be32(NFS4_LIMIT_SIZE);
3358 *p++ = cpu_to_be32(~(u32)0);
3359 *p++ = cpu_to_be32(~(u32)0);
3360
3361 /*
3362 * TODO: ACE's in delegations
3363 */
3364 *p++ = cpu_to_be32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
3365 *p++ = cpu_to_be32(0);
3366 *p++ = cpu_to_be32(0);
3367 *p++ = cpu_to_be32(0); /* XXX: is NULL principal ok? */
3368 break;
3369 case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
3370 switch (open->op_why_no_deleg) {
3371 case WND4_CONTENTION:
3372 case WND4_RESOURCE:
3373 p = xdr_reserve_space(xdr, 8);
3374 if (!p)
3375 return nfserr_resource;
3376 *p++ = cpu_to_be32(open->op_why_no_deleg);
3377 /* deleg signaling not supported yet: */
3378 *p++ = cpu_to_be32(0);
3379 break;
3380 default:
3381 p = xdr_reserve_space(xdr, 4);
3382 if (!p)
3383 return nfserr_resource;
3384 *p++ = cpu_to_be32(open->op_why_no_deleg);
3385 }
3386 break;
3387 default:
3388 BUG();
3389 }
3390 /* XXX save filehandle here */
3391 return 0;
3392}
3393
3394static __be32
3395nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
3396{
3397 struct xdr_stream *xdr = &resp->xdr;
3398
3399 return nfsd4_encode_stateid(xdr, &oc->oc_resp_stateid);
3400}
3401
3402static __be32
3403nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
3404{
3405 struct xdr_stream *xdr = &resp->xdr;
3406
3407 return nfsd4_encode_stateid(xdr, &od->od_stateid);
3408}
3409
3410static __be32 nfsd4_encode_splice_read(
3411 struct nfsd4_compoundres *resp,
3412 struct nfsd4_read *read,
3413 struct file *file, unsigned long maxcount)
3414{
3415 struct xdr_stream *xdr = &resp->xdr;
3416 struct xdr_buf *buf = xdr->buf;
3417 u32 eof;
3418 long len;
3419 int space_left;
3420 __be32 nfserr;
3421 __be32 *p = xdr->p - 2;
3422
3423 /* Make sure there will be room for padding if needed */
3424 if (xdr->end - xdr->p < 1)
3425 return nfserr_resource;
3426
3427 len = maxcount;
3428 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
3429 file, read->rd_offset, &maxcount);
3430 read->rd_length = maxcount;
3431 if (nfserr) {
3432 /*
3433 * nfsd_splice_actor may have already messed with the
3434 * page length; reset it so as not to confuse
3435 * xdr_truncate_encode:
3436 */
3437 buf->page_len = 0;
3438 return nfserr;
3439 }
3440
3441 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3442 d_inode(read->rd_fhp->fh_dentry)->i_size);
3443
3444 *(p++) = htonl(eof);
3445 *(p++) = htonl(maxcount);
3446
3447 buf->page_len = maxcount;
3448 buf->len += maxcount;
3449 xdr->page_ptr += (buf->page_base + maxcount + PAGE_SIZE - 1)
3450 / PAGE_SIZE;
3451
3452 /* Use rest of head for padding and remaining ops: */
3453 buf->tail[0].iov_base = xdr->p;
3454 buf->tail[0].iov_len = 0;
3455 xdr->iov = buf->tail;
3456 if (maxcount&3) {
3457 int pad = 4 - (maxcount&3);
3458
3459 *(xdr->p++) = 0;
3460
3461 buf->tail[0].iov_base += maxcount&3;
3462 buf->tail[0].iov_len = pad;
3463 buf->len += pad;
3464 }
3465
3466 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
3467 buf->buflen - buf->len);
3468 buf->buflen = buf->len + space_left;
3469 xdr->end = (__be32 *)((void *)xdr->end + space_left);
3470
3471 return 0;
3472}
3473
3474static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
3475 struct nfsd4_read *read,
3476 struct file *file, unsigned long maxcount)
3477{
3478 struct xdr_stream *xdr = &resp->xdr;
3479 u32 eof;
3480 int v;
3481 int starting_len = xdr->buf->len - 8;
3482 long len;
3483 int thislen;
3484 __be32 nfserr;
3485 __be32 tmp;
3486 __be32 *p;
3487 u32 zzz = 0;
3488 int pad;
3489
3490 len = maxcount;
3491 v = 0;
3492
3493 thislen = min_t(long, len, ((void *)xdr->end - (void *)xdr->p));
3494 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3495 WARN_ON_ONCE(!p);
3496 resp->rqstp->rq_vec[v].iov_base = p;
3497 resp->rqstp->rq_vec[v].iov_len = thislen;
3498 v++;
3499 len -= thislen;
3500
3501 while (len) {
3502 thislen = min_t(long, len, PAGE_SIZE);
3503 p = xdr_reserve_space(xdr, (thislen+3)&~3);
3504 WARN_ON_ONCE(!p);
3505 resp->rqstp->rq_vec[v].iov_base = p;
3506 resp->rqstp->rq_vec[v].iov_len = thislen;
3507 v++;
3508 len -= thislen;
3509 }
3510 read->rd_vlen = v;
3511
3512 len = maxcount;
3513 nfserr = nfsd_readv(resp->rqstp, read->rd_fhp, file, read->rd_offset,
3514 resp->rqstp->rq_vec, read->rd_vlen, &maxcount);
3515 read->rd_length = maxcount;
3516 if (nfserr)
3517 return nfserr;
3518 xdr_truncate_encode(xdr, starting_len + 8 + ((maxcount+3)&~3));
3519
3520 eof = nfsd_eof_on_read(len, maxcount, read->rd_offset,
3521 d_inode(read->rd_fhp->fh_dentry)->i_size);
3522
3523 tmp = htonl(eof);
3524 write_bytes_to_xdr_buf(xdr->buf, starting_len , &tmp, 4);
3525 tmp = htonl(maxcount);
3526 write_bytes_to_xdr_buf(xdr->buf, starting_len + 4, &tmp, 4);
3527
3528 pad = (maxcount&3) ? 4 - (maxcount&3) : 0;
3529 write_bytes_to_xdr_buf(xdr->buf, starting_len + 8 + maxcount,
3530 &zzz, pad);
3531 return 0;
3532
3533}
3534
3535static __be32
3536nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
3537 struct nfsd4_read *read)
3538{
3539 unsigned long maxcount;
3540 struct xdr_stream *xdr = &resp->xdr;
3541 struct file *file = read->rd_filp;
3542 int starting_len = xdr->buf->len;
3543 struct raparms *ra = NULL;
3544 __be32 *p;
3545
3546 p = xdr_reserve_space(xdr, 8); /* eof flag and byte count */
3547 if (!p) {
3548 WARN_ON_ONCE(test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags));
3549 return nfserr_resource;
3550 }
3551 if (resp->xdr.buf->page_len &&
3552 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags)) {
3553 WARN_ON_ONCE(1);
3554 return nfserr_resource;
3555 }
3556 xdr_commit_encode(xdr);
3557
3558 maxcount = svc_max_payload(resp->rqstp);
3559 maxcount = min_t(unsigned long, maxcount,
3560 (xdr->buf->buflen - xdr->buf->len));
3561 maxcount = min_t(unsigned long, maxcount, read->rd_length);
3562
3563 if (read->rd_tmp_file)
3564 ra = nfsd_init_raparms(file);
3565
3566 if (file->f_op->splice_read &&
3567 test_bit(RQ_SPLICE_OK, &resp->rqstp->rq_flags))
3568 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
3569 else
3570 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
3571
3572 if (ra)
3573 nfsd_put_raparams(file, ra);
3574
3575 if (nfserr)
3576 xdr_truncate_encode(xdr, starting_len);
3577
3578 return nfserr;
3579}
3580
3581static __be32
3582nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
3583{
3584 int maxcount;
3585 __be32 wire_count;
3586 int zero = 0;
3587 struct xdr_stream *xdr = &resp->xdr;
3588 int length_offset = xdr->buf->len;
3589 __be32 *p;
3590
3591 p = xdr_reserve_space(xdr, 4);
3592 if (!p)
3593 return nfserr_resource;
3594 maxcount = PAGE_SIZE;
3595
3596 p = xdr_reserve_space(xdr, maxcount);
3597 if (!p)
3598 return nfserr_resource;
3599 /*
3600 * XXX: By default, vfs_readlink() will truncate symlinks if they
3601 * would overflow the buffer. Is this kosher in NFSv4? If not, one
3602 * easy fix is: if vfs_readlink() precisely fills the buffer, assume
3603 * that truncation occurred, and return NFS4ERR_RESOURCE.
3604 */
3605 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
3606 (char *)p, &maxcount);
3607 if (nfserr == nfserr_isdir)
3608 nfserr = nfserr_inval;
3609 if (nfserr) {
3610 xdr_truncate_encode(xdr, length_offset);
3611 return nfserr;
3612 }
3613
3614 wire_count = htonl(maxcount);
3615 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, 4);
3616 xdr_truncate_encode(xdr, length_offset + 4 + ALIGN(maxcount, 4));
3617 if (maxcount & 3)
3618 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount,
3619 &zero, 4 - (maxcount&3));
3620 return 0;
3621}
3622
3623static __be32
3624nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3625{
3626 int maxcount;
3627 int bytes_left;
3628 loff_t offset;
3629 __be64 wire_offset;
3630 struct xdr_stream *xdr = &resp->xdr;
3631 int starting_len = xdr->buf->len;
3632 __be32 *p;
3633
3634 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3635 if (!p)
3636 return nfserr_resource;
3637
3638 /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3639 *p++ = cpu_to_be32(0);
3640 *p++ = cpu_to_be32(0);
3641 resp->xdr.buf->head[0].iov_len = ((char *)resp->xdr.p)
3642 - (char *)resp->xdr.buf->head[0].iov_base;
3643
3644 /*
3645 * Number of bytes left for directory entries allowing for the
3646 * final 8 bytes of the readdir and a following failed op:
3647 */
3648 bytes_left = xdr->buf->buflen - xdr->buf->len
3649 - COMPOUND_ERR_SLACK_SPACE - 8;
3650 if (bytes_left < 0) {
3651 nfserr = nfserr_resource;
3652 goto err_no_verf;
3653 }
3654 maxcount = min_t(u32, readdir->rd_maxcount, INT_MAX);
3655 /*
3656 * Note the rfc defines rd_maxcount as the size of the
3657 * READDIR4resok structure, which includes the verifier above
3658 * and the 8 bytes encoded at the end of this function:
3659 */
3660 if (maxcount < 16) {
3661 nfserr = nfserr_toosmall;
3662 goto err_no_verf;
3663 }
3664 maxcount = min_t(int, maxcount-16, bytes_left);
3665
3666 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0: */
3667 if (!readdir->rd_dircount)
3668 readdir->rd_dircount = INT_MAX;
3669
3670 readdir->xdr = xdr;
3671 readdir->rd_maxcount = maxcount;
3672 readdir->common.err = 0;
3673 readdir->cookie_offset = 0;
3674
3675 offset = readdir->rd_cookie;
3676 nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3677 &offset,
3678 &readdir->common, nfsd4_encode_dirent);
3679 if (nfserr == nfs_ok &&
3680 readdir->common.err == nfserr_toosmall &&
3681 xdr->buf->len == starting_len + 8) {
3682 /* nothing encoded; which limit did we hit?: */
3683 if (maxcount - 16 < bytes_left)
3684 /* It was the fault of rd_maxcount: */
3685 nfserr = nfserr_toosmall;
3686 else
3687 /* We ran out of buffer space: */
3688 nfserr = nfserr_resource;
3689 }
3690 if (nfserr)
3691 goto err_no_verf;
3692
3693 if (readdir->cookie_offset) {
3694 wire_offset = cpu_to_be64(offset);
3695 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset,
3696 &wire_offset, 8);
3697 }
3698
3699 p = xdr_reserve_space(xdr, 8);
3700 if (!p) {
3701 WARN_ON_ONCE(1);
3702 goto err_no_verf;
3703 }
3704 *p++ = 0; /* no more entries */
3705 *p++ = htonl(readdir->common.err == nfserr_eof);
3706
3707 return 0;
3708err_no_verf:
3709 xdr_truncate_encode(xdr, starting_len);
3710 return nfserr;
3711}
3712
3713static __be32
3714nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3715{
3716 struct xdr_stream *xdr = &resp->xdr;
3717 __be32 *p;
3718
3719 p = xdr_reserve_space(xdr, 20);
3720 if (!p)
3721 return nfserr_resource;
3722 p = encode_cinfo(p, &remove->rm_cinfo);
3723 return 0;
3724}
3725
3726static __be32
3727nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3728{
3729 struct xdr_stream *xdr = &resp->xdr;
3730 __be32 *p;
3731
3732 p = xdr_reserve_space(xdr, 40);
3733 if (!p)
3734 return nfserr_resource;
3735 p = encode_cinfo(p, &rename->rn_sinfo);
3736 p = encode_cinfo(p, &rename->rn_tinfo);
3737 return 0;
3738}
3739
3740static __be32
3741nfsd4_do_encode_secinfo(struct xdr_stream *xdr, struct svc_export *exp)
3742{
3743 u32 i, nflavs, supported;
3744 struct exp_flavor_info *flavs;
3745 struct exp_flavor_info def_flavs[2];
3746 __be32 *p, *flavorsp;
3747 static bool report = true;
3748
3749 if (exp->ex_nflavors) {
3750 flavs = exp->ex_flavors;
3751 nflavs = exp->ex_nflavors;
3752 } else { /* Handling of some defaults in absence of real secinfo: */
3753 flavs = def_flavs;
3754 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3755 nflavs = 2;
3756 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3757 flavs[1].pseudoflavor = RPC_AUTH_NULL;
3758 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3759 nflavs = 1;
3760 flavs[0].pseudoflavor
3761 = svcauth_gss_flavor(exp->ex_client);
3762 } else {
3763 nflavs = 1;
3764 flavs[0].pseudoflavor
3765 = exp->ex_client->flavour->flavour;
3766 }
3767 }
3768
3769 supported = 0;
3770 p = xdr_reserve_space(xdr, 4);
3771 if (!p)
3772 return nfserr_resource;
3773 flavorsp = p++; /* to be backfilled later */
3774
3775 for (i = 0; i < nflavs; i++) {
3776 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3777 struct rpcsec_gss_info info;
3778
3779 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3780 supported++;
3781 p = xdr_reserve_space(xdr, 4 + 4 +
3782 XDR_LEN(info.oid.len) + 4 + 4);
3783 if (!p)
3784 return nfserr_resource;
3785 *p++ = cpu_to_be32(RPC_AUTH_GSS);
3786 p = xdr_encode_opaque(p, info.oid.data, info.oid.len);
3787 *p++ = cpu_to_be32(info.qop);
3788 *p++ = cpu_to_be32(info.service);
3789 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3790 supported++;
3791 p = xdr_reserve_space(xdr, 4);
3792 if (!p)
3793 return nfserr_resource;
3794 *p++ = cpu_to_be32(pf);
3795 } else {
3796 if (report)
3797 pr_warn("NFS: SECINFO: security flavor %u "
3798 "is not supported\n", pf);
3799 }
3800 }
3801
3802 if (nflavs != supported)
3803 report = false;
3804 *flavorsp = htonl(supported);
3805 return 0;
3806}
3807
3808static __be32
3809nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3810 struct nfsd4_secinfo *secinfo)
3811{
3812 struct xdr_stream *xdr = &resp->xdr;
3813
3814 return nfsd4_do_encode_secinfo(xdr, secinfo->si_exp);
3815}
3816
3817static __be32
3818nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3819 struct nfsd4_secinfo_no_name *secinfo)
3820{
3821 struct xdr_stream *xdr = &resp->xdr;
3822
3823 return nfsd4_do_encode_secinfo(xdr, secinfo->sin_exp);
3824}
3825
3826/*
3827 * The SETATTR encode routine is special -- it always encodes a bitmap,
3828 * regardless of the error status.
3829 */
3830static __be32
3831nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3832{
3833 struct xdr_stream *xdr = &resp->xdr;
3834 __be32 *p;
3835
3836 p = xdr_reserve_space(xdr, 16);
3837 if (!p)
3838 return nfserr_resource;
3839 if (nfserr) {
3840 *p++ = cpu_to_be32(3);
3841 *p++ = cpu_to_be32(0);
3842 *p++ = cpu_to_be32(0);
3843 *p++ = cpu_to_be32(0);
3844 }
3845 else {
3846 *p++ = cpu_to_be32(3);
3847 *p++ = cpu_to_be32(setattr->sa_bmval[0]);
3848 *p++ = cpu_to_be32(setattr->sa_bmval[1]);
3849 *p++ = cpu_to_be32(setattr->sa_bmval[2]);
3850 }
3851 return nfserr;
3852}
3853
3854static __be32
3855nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3856{
3857 struct xdr_stream *xdr = &resp->xdr;
3858 __be32 *p;
3859
3860 if (!nfserr) {
3861 p = xdr_reserve_space(xdr, 8 + NFS4_VERIFIER_SIZE);
3862 if (!p)
3863 return nfserr_resource;
3864 p = xdr_encode_opaque_fixed(p, &scd->se_clientid, 8);
3865 p = xdr_encode_opaque_fixed(p, &scd->se_confirm,
3866 NFS4_VERIFIER_SIZE);
3867 }
3868 else if (nfserr == nfserr_clid_inuse) {
3869 p = xdr_reserve_space(xdr, 8);
3870 if (!p)
3871 return nfserr_resource;
3872 *p++ = cpu_to_be32(0);
3873 *p++ = cpu_to_be32(0);
3874 }
3875 return nfserr;
3876}
3877
3878static __be32
3879nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3880{
3881 struct xdr_stream *xdr = &resp->xdr;
3882 __be32 *p;
3883
3884 p = xdr_reserve_space(xdr, 16);
3885 if (!p)
3886 return nfserr_resource;
3887 *p++ = cpu_to_be32(write->wr_bytes_written);
3888 *p++ = cpu_to_be32(write->wr_how_written);
3889 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
3890 NFS4_VERIFIER_SIZE);
3891 return 0;
3892}
3893
3894static __be32
3895nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3896 struct nfsd4_exchange_id *exid)
3897{
3898 struct xdr_stream *xdr = &resp->xdr;
3899 __be32 *p;
3900 char *major_id;
3901 char *server_scope;
3902 int major_id_sz;
3903 int server_scope_sz;
3904 uint64_t minor_id = 0;
3905
3906 major_id = utsname()->nodename;
3907 major_id_sz = strlen(major_id);
3908 server_scope = utsname()->nodename;
3909 server_scope_sz = strlen(server_scope);
3910
3911 p = xdr_reserve_space(xdr,
3912 8 /* eir_clientid */ +
3913 4 /* eir_sequenceid */ +
3914 4 /* eir_flags */ +
3915 4 /* spr_how */);
3916 if (!p)
3917 return nfserr_resource;
3918
3919 p = xdr_encode_opaque_fixed(p, &exid->clientid, 8);
3920 *p++ = cpu_to_be32(exid->seqid);
3921 *p++ = cpu_to_be32(exid->flags);
3922
3923 *p++ = cpu_to_be32(exid->spa_how);
3924
3925 switch (exid->spa_how) {
3926 case SP4_NONE:
3927 break;
3928 case SP4_MACH_CRED:
3929 /* spo_must_enforce bitmap: */
3930 nfserr = nfsd4_encode_bitmap(xdr,
3931 exid->spo_must_enforce[0],
3932 exid->spo_must_enforce[1],
3933 exid->spo_must_enforce[2]);
3934 if (nfserr)
3935 return nfserr;
3936 /* spo_must_allow bitmap: */
3937 nfserr = nfsd4_encode_bitmap(xdr,
3938 exid->spo_must_allow[0],
3939 exid->spo_must_allow[1],
3940 exid->spo_must_allow[2]);
3941 if (nfserr)
3942 return nfserr;
3943 break;
3944 default:
3945 WARN_ON_ONCE(1);
3946 }
3947
3948 p = xdr_reserve_space(xdr,
3949 8 /* so_minor_id */ +
3950 4 /* so_major_id.len */ +
3951 (XDR_QUADLEN(major_id_sz) * 4) +
3952 4 /* eir_server_scope.len */ +
3953 (XDR_QUADLEN(server_scope_sz) * 4) +
3954 4 /* eir_server_impl_id.count (0) */);
3955 if (!p)
3956 return nfserr_resource;
3957
3958 /* The server_owner struct */
3959 p = xdr_encode_hyper(p, minor_id); /* Minor id */
3960 /* major id */
3961 p = xdr_encode_opaque(p, major_id, major_id_sz);
3962
3963 /* Server scope */
3964 p = xdr_encode_opaque(p, server_scope, server_scope_sz);
3965
3966 /* Implementation id */
3967 *p++ = cpu_to_be32(0); /* zero length nfs_impl_id4 array */
3968 return 0;
3969}
3970
3971static __be32
3972nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3973 struct nfsd4_create_session *sess)
3974{
3975 struct xdr_stream *xdr = &resp->xdr;
3976 __be32 *p;
3977
3978 p = xdr_reserve_space(xdr, 24);
3979 if (!p)
3980 return nfserr_resource;
3981 p = xdr_encode_opaque_fixed(p, sess->sessionid.data,
3982 NFS4_MAX_SESSIONID_LEN);
3983 *p++ = cpu_to_be32(sess->seqid);
3984 *p++ = cpu_to_be32(sess->flags);
3985
3986 p = xdr_reserve_space(xdr, 28);
3987 if (!p)
3988 return nfserr_resource;
3989 *p++ = cpu_to_be32(0); /* headerpadsz */
3990 *p++ = cpu_to_be32(sess->fore_channel.maxreq_sz);
3991 *p++ = cpu_to_be32(sess->fore_channel.maxresp_sz);
3992 *p++ = cpu_to_be32(sess->fore_channel.maxresp_cached);
3993 *p++ = cpu_to_be32(sess->fore_channel.maxops);
3994 *p++ = cpu_to_be32(sess->fore_channel.maxreqs);
3995 *p++ = cpu_to_be32(sess->fore_channel.nr_rdma_attrs);
3996
3997 if (sess->fore_channel.nr_rdma_attrs) {
3998 p = xdr_reserve_space(xdr, 4);
3999 if (!p)
4000 return nfserr_resource;
4001 *p++ = cpu_to_be32(sess->fore_channel.rdma_attrs);
4002 }
4003
4004 p = xdr_reserve_space(xdr, 28);
4005 if (!p)
4006 return nfserr_resource;
4007 *p++ = cpu_to_be32(0); /* headerpadsz */
4008 *p++ = cpu_to_be32(sess->back_channel.maxreq_sz);
4009 *p++ = cpu_to_be32(sess->back_channel.maxresp_sz);
4010 *p++ = cpu_to_be32(sess->back_channel.maxresp_cached);
4011 *p++ = cpu_to_be32(sess->back_channel.maxops);
4012 *p++ = cpu_to_be32(sess->back_channel.maxreqs);
4013 *p++ = cpu_to_be32(sess->back_channel.nr_rdma_attrs);
4014
4015 if (sess->back_channel.nr_rdma_attrs) {
4016 p = xdr_reserve_space(xdr, 4);
4017 if (!p)
4018 return nfserr_resource;
4019 *p++ = cpu_to_be32(sess->back_channel.rdma_attrs);
4020 }
4021 return 0;
4022}
4023
4024static __be32
4025nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
4026 struct nfsd4_sequence *seq)
4027{
4028 struct xdr_stream *xdr = &resp->xdr;
4029 __be32 *p;
4030
4031 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN + 20);
4032 if (!p)
4033 return nfserr_resource;
4034 p = xdr_encode_opaque_fixed(p, seq->sessionid.data,
4035 NFS4_MAX_SESSIONID_LEN);
4036 *p++ = cpu_to_be32(seq->seqid);
4037 *p++ = cpu_to_be32(seq->slotid);
4038 /* Note slotid's are numbered from zero: */
4039 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_highest_slotid */
4040 *p++ = cpu_to_be32(seq->maxslots - 1); /* sr_target_highest_slotid */
4041 *p++ = cpu_to_be32(seq->status_flags);
4042
4043 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
4044 return 0;
4045}
4046
4047static __be32
4048nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
4049 struct nfsd4_test_stateid *test_stateid)
4050{
4051 struct xdr_stream *xdr = &resp->xdr;
4052 struct nfsd4_test_stateid_id *stateid, *next;
4053 __be32 *p;
4054
4055 p = xdr_reserve_space(xdr, 4 + (4 * test_stateid->ts_num_ids));
4056 if (!p)
4057 return nfserr_resource;
4058 *p++ = htonl(test_stateid->ts_num_ids);
4059
4060 list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
4061 *p++ = stateid->ts_id_status;
4062 }
4063
4064 return 0;
4065}
4066
4067#ifdef CONFIG_NFSD_PNFS
4068static __be32
4069nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4070 struct nfsd4_getdeviceinfo *gdev)
4071{
4072 struct xdr_stream *xdr = &resp->xdr;
4073 const struct nfsd4_layout_ops *ops;
4074 u32 starting_len = xdr->buf->len, needed_len;
4075 __be32 *p;
4076
4077 p = xdr_reserve_space(xdr, 4);
4078 if (!p)
4079 return nfserr_resource;
4080
4081 *p++ = cpu_to_be32(gdev->gd_layout_type);
4082
4083 /* If maxcount is 0 then just update notifications */
4084 if (gdev->gd_maxcount != 0) {
4085 ops = nfsd4_layout_ops[gdev->gd_layout_type];
4086 nfserr = ops->encode_getdeviceinfo(xdr, gdev);
4087 if (nfserr) {
4088 /*
4089 * We don't bother to burden the layout drivers with
4090 * enforcing gd_maxcount, just tell the client to
4091 * come back with a bigger buffer if it's not enough.
4092 */
4093 if (xdr->buf->len + 4 > gdev->gd_maxcount)
4094 goto toosmall;
4095 return nfserr;
4096 }
4097 }
4098
4099 if (gdev->gd_notify_types) {
4100 p = xdr_reserve_space(xdr, 4 + 4);
4101 if (!p)
4102 return nfserr_resource;
4103 *p++ = cpu_to_be32(1); /* bitmap length */
4104 *p++ = cpu_to_be32(gdev->gd_notify_types);
4105 } else {
4106 p = xdr_reserve_space(xdr, 4);
4107 if (!p)
4108 return nfserr_resource;
4109 *p++ = 0;
4110 }
4111
4112 return 0;
4113toosmall:
4114 dprintk("%s: maxcount too small\n", __func__);
4115 needed_len = xdr->buf->len + 4 /* notifications */;
4116 xdr_truncate_encode(xdr, starting_len);
4117 p = xdr_reserve_space(xdr, 4);
4118 if (!p)
4119 return nfserr_resource;
4120 *p++ = cpu_to_be32(needed_len);
4121 return nfserr_toosmall;
4122}
4123
4124static __be32
4125nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
4126 struct nfsd4_layoutget *lgp)
4127{
4128 struct xdr_stream *xdr = &resp->xdr;
4129 const struct nfsd4_layout_ops *ops;
4130 __be32 *p;
4131
4132 p = xdr_reserve_space(xdr, 36 + sizeof(stateid_opaque_t));
4133 if (!p)
4134 return nfserr_resource;
4135
4136 *p++ = cpu_to_be32(1); /* we always set return-on-close */
4137 *p++ = cpu_to_be32(lgp->lg_sid.si_generation);
4138 p = xdr_encode_opaque_fixed(p, &lgp->lg_sid.si_opaque,
4139 sizeof(stateid_opaque_t));
4140
4141 *p++ = cpu_to_be32(1); /* we always return a single layout */
4142 p = xdr_encode_hyper(p, lgp->lg_seg.offset);
4143 p = xdr_encode_hyper(p, lgp->lg_seg.length);
4144 *p++ = cpu_to_be32(lgp->lg_seg.iomode);
4145 *p++ = cpu_to_be32(lgp->lg_layout_type);
4146
4147 ops = nfsd4_layout_ops[lgp->lg_layout_type];
4148 return ops->encode_layoutget(xdr, lgp);
4149}
4150
4151static __be32
4152nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
4153 struct nfsd4_layoutcommit *lcp)
4154{
4155 struct xdr_stream *xdr = &resp->xdr;
4156 __be32 *p;
4157
4158 p = xdr_reserve_space(xdr, 4);
4159 if (!p)
4160 return nfserr_resource;
4161 *p++ = cpu_to_be32(lcp->lc_size_chg);
4162 if (lcp->lc_size_chg) {
4163 p = xdr_reserve_space(xdr, 8);
4164 if (!p)
4165 return nfserr_resource;
4166 p = xdr_encode_hyper(p, lcp->lc_newsize);
4167 }
4168
4169 return 0;
4170}
4171
4172static __be32
4173nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
4174 struct nfsd4_layoutreturn *lrp)
4175{
4176 struct xdr_stream *xdr = &resp->xdr;
4177 __be32 *p;
4178
4179 p = xdr_reserve_space(xdr, 4);
4180 if (!p)
4181 return nfserr_resource;
4182 *p++ = cpu_to_be32(lrp->lrs_present);
4183 if (lrp->lrs_present)
4184 return nfsd4_encode_stateid(xdr, &lrp->lr_sid);
4185 return 0;
4186}
4187#endif /* CONFIG_NFSD_PNFS */
4188
4189static __be32
4190nfsd42_encode_write_res(struct nfsd4_compoundres *resp, struct nfsd42_write_res *write)
4191{
4192 __be32 *p;
4193
4194 p = xdr_reserve_space(&resp->xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
4195 if (!p)
4196 return nfserr_resource;
4197
4198 *p++ = cpu_to_be32(0);
4199 p = xdr_encode_hyper(p, write->wr_bytes_written);
4200 *p++ = cpu_to_be32(write->wr_stable_how);
4201 p = xdr_encode_opaque_fixed(p, write->wr_verifier.data,
4202 NFS4_VERIFIER_SIZE);
4203 return nfs_ok;
4204}
4205
4206static __be32
4207nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
4208 struct nfsd4_copy *copy)
4209{
4210 __be32 *p;
4211
4212 nfserr = nfsd42_encode_write_res(resp, ©->cp_res);
4213 if (nfserr)
4214 return nfserr;
4215
4216 p = xdr_reserve_space(&resp->xdr, 4 + 4);
4217 *p++ = xdr_one; /* cr_consecutive */
4218 *p++ = cpu_to_be32(copy->cp_synchronous);
4219 return 0;
4220}
4221
4222static __be32
4223nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
4224 struct nfsd4_seek *seek)
4225{
4226 __be32 *p;
4227
4228 p = xdr_reserve_space(&resp->xdr, 4 + 8);
4229 *p++ = cpu_to_be32(seek->seek_eof);
4230 p = xdr_encode_hyper(p, seek->seek_pos);
4231
4232 return 0;
4233}
4234
4235static __be32
4236nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
4237{
4238 return nfserr;
4239}
4240
4241typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
4242
4243/*
4244 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
4245 * since we don't need to filter out obsolete ops as this is
4246 * done in the decoding phase.
4247 */
4248static const nfsd4_enc nfsd4_enc_ops[] = {
4249 [OP_ACCESS] = (nfsd4_enc)nfsd4_encode_access,
4250 [OP_CLOSE] = (nfsd4_enc)nfsd4_encode_close,
4251 [OP_COMMIT] = (nfsd4_enc)nfsd4_encode_commit,
4252 [OP_CREATE] = (nfsd4_enc)nfsd4_encode_create,
4253 [OP_DELEGPURGE] = (nfsd4_enc)nfsd4_encode_noop,
4254 [OP_DELEGRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4255 [OP_GETATTR] = (nfsd4_enc)nfsd4_encode_getattr,
4256 [OP_GETFH] = (nfsd4_enc)nfsd4_encode_getfh,
4257 [OP_LINK] = (nfsd4_enc)nfsd4_encode_link,
4258 [OP_LOCK] = (nfsd4_enc)nfsd4_encode_lock,
4259 [OP_LOCKT] = (nfsd4_enc)nfsd4_encode_lockt,
4260 [OP_LOCKU] = (nfsd4_enc)nfsd4_encode_locku,
4261 [OP_LOOKUP] = (nfsd4_enc)nfsd4_encode_noop,
4262 [OP_LOOKUPP] = (nfsd4_enc)nfsd4_encode_noop,
4263 [OP_NVERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4264 [OP_OPEN] = (nfsd4_enc)nfsd4_encode_open,
4265 [OP_OPENATTR] = (nfsd4_enc)nfsd4_encode_noop,
4266 [OP_OPEN_CONFIRM] = (nfsd4_enc)nfsd4_encode_open_confirm,
4267 [OP_OPEN_DOWNGRADE] = (nfsd4_enc)nfsd4_encode_open_downgrade,
4268 [OP_PUTFH] = (nfsd4_enc)nfsd4_encode_noop,
4269 [OP_PUTPUBFH] = (nfsd4_enc)nfsd4_encode_noop,
4270 [OP_PUTROOTFH] = (nfsd4_enc)nfsd4_encode_noop,
4271 [OP_READ] = (nfsd4_enc)nfsd4_encode_read,
4272 [OP_READDIR] = (nfsd4_enc)nfsd4_encode_readdir,
4273 [OP_READLINK] = (nfsd4_enc)nfsd4_encode_readlink,
4274 [OP_REMOVE] = (nfsd4_enc)nfsd4_encode_remove,
4275 [OP_RENAME] = (nfsd4_enc)nfsd4_encode_rename,
4276 [OP_RENEW] = (nfsd4_enc)nfsd4_encode_noop,
4277 [OP_RESTOREFH] = (nfsd4_enc)nfsd4_encode_noop,
4278 [OP_SAVEFH] = (nfsd4_enc)nfsd4_encode_noop,
4279 [OP_SECINFO] = (nfsd4_enc)nfsd4_encode_secinfo,
4280 [OP_SETATTR] = (nfsd4_enc)nfsd4_encode_setattr,
4281 [OP_SETCLIENTID] = (nfsd4_enc)nfsd4_encode_setclientid,
4282 [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
4283 [OP_VERIFY] = (nfsd4_enc)nfsd4_encode_noop,
4284 [OP_WRITE] = (nfsd4_enc)nfsd4_encode_write,
4285 [OP_RELEASE_LOCKOWNER] = (nfsd4_enc)nfsd4_encode_noop,
4286
4287 /* NFSv4.1 operations */
4288 [OP_BACKCHANNEL_CTL] = (nfsd4_enc)nfsd4_encode_noop,
4289 [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
4290 [OP_EXCHANGE_ID] = (nfsd4_enc)nfsd4_encode_exchange_id,
4291 [OP_CREATE_SESSION] = (nfsd4_enc)nfsd4_encode_create_session,
4292 [OP_DESTROY_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
4293 [OP_FREE_STATEID] = (nfsd4_enc)nfsd4_encode_noop,
4294 [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4295#ifdef CONFIG_NFSD_PNFS
4296 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_getdeviceinfo,
4297 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4298 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_layoutcommit,
4299 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_layoutget,
4300 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_layoutreturn,
4301#else
4302 [OP_GETDEVICEINFO] = (nfsd4_enc)nfsd4_encode_noop,
4303 [OP_GETDEVICELIST] = (nfsd4_enc)nfsd4_encode_noop,
4304 [OP_LAYOUTCOMMIT] = (nfsd4_enc)nfsd4_encode_noop,
4305 [OP_LAYOUTGET] = (nfsd4_enc)nfsd4_encode_noop,
4306 [OP_LAYOUTRETURN] = (nfsd4_enc)nfsd4_encode_noop,
4307#endif
4308 [OP_SECINFO_NO_NAME] = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
4309 [OP_SEQUENCE] = (nfsd4_enc)nfsd4_encode_sequence,
4310 [OP_SET_SSV] = (nfsd4_enc)nfsd4_encode_noop,
4311 [OP_TEST_STATEID] = (nfsd4_enc)nfsd4_encode_test_stateid,
4312 [OP_WANT_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
4313 [OP_DESTROY_CLIENTID] = (nfsd4_enc)nfsd4_encode_noop,
4314 [OP_RECLAIM_COMPLETE] = (nfsd4_enc)nfsd4_encode_noop,
4315
4316 /* NFSv4.2 operations */
4317 [OP_ALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4318 [OP_COPY] = (nfsd4_enc)nfsd4_encode_copy,
4319 [OP_COPY_NOTIFY] = (nfsd4_enc)nfsd4_encode_noop,
4320 [OP_DEALLOCATE] = (nfsd4_enc)nfsd4_encode_noop,
4321 [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop,
4322 [OP_LAYOUTERROR] = (nfsd4_enc)nfsd4_encode_noop,
4323 [OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
4324 [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
4325 [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
4326 [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
4327 [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
4328 [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
4329 [OP_CLONE] = (nfsd4_enc)nfsd4_encode_noop,
4330};
4331
4332/*
4333 * Calculate whether we still have space to encode repsize bytes.
4334 * There are two considerations:
4335 * - For NFS versions >=4.1, the size of the reply must stay within
4336 * session limits
4337 * - For all NFS versions, we must stay within limited preallocated
4338 * buffer space.
4339 *
4340 * This is called before the operation is processed, so can only provide
4341 * an upper estimate. For some nonidempotent operations (such as
4342 * getattr), it's not necessarily a problem if that estimate is wrong,
4343 * as we can fail it after processing without significant side effects.
4344 */
4345__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
4346{
4347 struct xdr_buf *buf = &resp->rqstp->rq_res;
4348 struct nfsd4_slot *slot = resp->cstate.slot;
4349
4350 if (buf->len + respsize <= buf->buflen)
4351 return nfs_ok;
4352 if (!nfsd4_has_session(&resp->cstate))
4353 return nfserr_resource;
4354 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
4355 WARN_ON_ONCE(1);
4356 return nfserr_rep_too_big_to_cache;
4357 }
4358 return nfserr_rep_too_big;
4359}
4360
4361void
4362nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
4363{
4364 struct xdr_stream *xdr = &resp->xdr;
4365 struct nfs4_stateowner *so = resp->cstate.replay_owner;
4366 struct svc_rqst *rqstp = resp->rqstp;
4367 const struct nfsd4_operation *opdesc = op->opdesc;
4368 int post_err_offset;
4369 nfsd4_enc encoder;
4370 __be32 *p;
4371
4372 p = xdr_reserve_space(xdr, 8);
4373 if (!p) {
4374 WARN_ON_ONCE(1);
4375 return;
4376 }
4377 *p++ = cpu_to_be32(op->opnum);
4378 post_err_offset = xdr->buf->len;
4379
4380 if (op->opnum == OP_ILLEGAL)
4381 goto status;
4382 if (op->status && opdesc &&
4383 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
4384 goto status;
4385 BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
4386 !nfsd4_enc_ops[op->opnum]);
4387 encoder = nfsd4_enc_ops[op->opnum];
4388 op->status = encoder(resp, op->status, &op->u);
4389 if (opdesc && opdesc->op_release)
4390 opdesc->op_release(&op->u);
4391 xdr_commit_encode(xdr);
4392
4393 /* nfsd4_check_resp_size guarantees enough room for error status */
4394 if (!op->status) {
4395 int space_needed = 0;
4396 if (!nfsd4_last_compound_op(rqstp))
4397 space_needed = COMPOUND_ERR_SLACK_SPACE;
4398 op->status = nfsd4_check_resp_size(resp, space_needed);
4399 }
4400 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
4401 struct nfsd4_slot *slot = resp->cstate.slot;
4402
4403 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
4404 op->status = nfserr_rep_too_big_to_cache;
4405 else
4406 op->status = nfserr_rep_too_big;
4407 }
4408 if (op->status == nfserr_resource ||
4409 op->status == nfserr_rep_too_big ||
4410 op->status == nfserr_rep_too_big_to_cache) {
4411 /*
4412 * The operation may have already been encoded or
4413 * partially encoded. No op returns anything additional
4414 * in the case of one of these three errors, so we can
4415 * just truncate back to after the status. But it's a
4416 * bug if we had to do this on a non-idempotent op:
4417 */
4418 warn_on_nonidempotent_op(op);
4419 xdr_truncate_encode(xdr, post_err_offset);
4420 }
4421 if (so) {
4422 int len = xdr->buf->len - post_err_offset;
4423
4424 so->so_replay.rp_status = op->status;
4425 so->so_replay.rp_buflen = len;
4426 read_bytes_from_xdr_buf(xdr->buf, post_err_offset,
4427 so->so_replay.rp_buf, len);
4428 }
4429status:
4430 /* Note that op->status is already in network byte order: */
4431 write_bytes_to_xdr_buf(xdr->buf, post_err_offset - 4, &op->status, 4);
4432}
4433
4434/*
4435 * Encode the reply stored in the stateowner reply cache
4436 *
4437 * XDR note: do not encode rp->rp_buflen: the buffer contains the
4438 * previously sent already encoded operation.
4439 */
4440void
4441nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
4442{
4443 __be32 *p;
4444 struct nfs4_replay *rp = op->replay;
4445
4446 BUG_ON(!rp);
4447
4448 p = xdr_reserve_space(xdr, 8 + rp->rp_buflen);
4449 if (!p) {
4450 WARN_ON_ONCE(1);
4451 return;
4452 }
4453 *p++ = cpu_to_be32(op->opnum);
4454 *p++ = rp->rp_status; /* already xdr'ed */
4455
4456 p = xdr_encode_opaque_fixed(p, rp->rp_buf, rp->rp_buflen);
4457}
4458
4459int
4460nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p)
4461{
4462 return xdr_ressize_check(rqstp, p);
4463}
4464
4465void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
4466{
4467 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4468
4469 if (args->ops != args->iops) {
4470 kfree(args->ops);
4471 args->ops = args->iops;
4472 }
4473 kfree(args->tmpp);
4474 args->tmpp = NULL;
4475 while (args->to_free) {
4476 struct svcxdr_tmpbuf *tb = args->to_free;
4477 args->to_free = tb->next;
4478 kfree(tb);
4479 }
4480}
4481
4482int
4483nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p)
4484{
4485 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4486
4487 if (rqstp->rq_arg.head[0].iov_len % 4) {
4488 /* client is nuts */
4489 dprintk("%s: compound not properly padded! (peeraddr=%pISc xid=0x%x)",
4490 __func__, svc_addr(rqstp), be32_to_cpu(rqstp->rq_xid));
4491 return 0;
4492 }
4493 args->p = p;
4494 args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
4495 args->pagelist = rqstp->rq_arg.pages;
4496 args->pagelen = rqstp->rq_arg.page_len;
4497 args->tail = false;
4498 args->tmpp = NULL;
4499 args->to_free = NULL;
4500 args->ops = args->iops;
4501 args->rqstp = rqstp;
4502
4503 return !nfsd4_decode_compound(args);
4504}
4505
4506int
4507nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p)
4508{
4509 /*
4510 * All that remains is to write the tag and operation count...
4511 */
4512 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4513 struct xdr_buf *buf = resp->xdr.buf;
4514
4515 WARN_ON_ONCE(buf->len != buf->head[0].iov_len + buf->page_len +
4516 buf->tail[0].iov_len);
4517
4518 rqstp->rq_next_page = resp->xdr.page_ptr + 1;
4519
4520 p = resp->tagp;
4521 *p++ = htonl(resp->taglen);
4522 memcpy(p, resp->tag, resp->taglen);
4523 p += XDR_QUADLEN(resp->taglen);
4524 *p++ = htonl(resp->opcnt);
4525
4526 nfsd4_sequence_done(resp);
4527 return 1;
4528}
4529
4530/*
4531 * Local variables:
4532 * c-basic-offset: 8
4533 * End:
4534 */