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 #include "nfs4xdr_gen.h"
59
60 #include "trace.h"
61
62 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
63 #include <linux/security.h>
64 #endif
65
66
67 #define NFSDDBG_FACILITY NFSDDBG_XDR
68
69 const u32 nfsd_suppattrs[3][3] = {
70 {NFSD4_SUPPORTED_ATTRS_WORD0,
71 NFSD4_SUPPORTED_ATTRS_WORD1,
72 NFSD4_SUPPORTED_ATTRS_WORD2},
73
74 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
75 NFSD4_1_SUPPORTED_ATTRS_WORD1,
76 NFSD4_1_SUPPORTED_ATTRS_WORD2},
77
78 {NFSD4_1_SUPPORTED_ATTRS_WORD0,
79 NFSD4_1_SUPPORTED_ATTRS_WORD1,
80 NFSD4_2_SUPPORTED_ATTRS_WORD2},
81 };
82
83 /*
84 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
85 * directory in order to indicate to the client that a filesystem boundary is present
86 * We use a fixed fsid for a referral
87 */
88 #define NFS4_REFERRAL_FSID_MAJOR 0x8000000ULL
89 #define NFS4_REFERRAL_FSID_MINOR 0x8000000ULL
90
91 static __be32
check_filename(char * str,int len)92 check_filename(char *str, int len)
93 {
94 int i;
95
96 if (len == 0)
97 return nfserr_inval;
98 if (len > NFS4_MAXNAMLEN)
99 return nfserr_nametoolong;
100 if (isdotent(str, len))
101 return nfserr_badname;
102 for (i = 0; i < len; i++)
103 if (str[i] == '/')
104 return nfserr_badname;
105 return 0;
106 }
107
zero_clientid(clientid_t * clid)108 static int zero_clientid(clientid_t *clid)
109 {
110 return (clid->cl_boot == 0) && (clid->cl_id == 0);
111 }
112
113 /**
114 * svcxdr_tmpalloc - allocate memory to be freed after compound processing
115 * @argp: NFSv4 compound argument structure
116 * @len: length of buffer to allocate
117 *
118 * Allocates a buffer of size @len to be freed when processing the compound
119 * operation described in @argp finishes.
120 */
121 static void *
svcxdr_tmpalloc(struct nfsd4_compoundargs * argp,size_t len)122 svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, size_t len)
123 {
124 struct svcxdr_tmpbuf *tb;
125
126 tb = kmalloc(struct_size(tb, buf, len), GFP_KERNEL);
127 if (!tb)
128 return NULL;
129 tb->next = argp->to_free;
130 argp->to_free = tb;
131 return tb->buf;
132 }
133
134 /*
135 * For xdr strings that need to be passed to other kernel api's
136 * as null-terminated strings.
137 *
138 * Note null-terminating in place usually isn't safe since the
139 * buffer might end on a page boundary.
140 */
141 static char *
svcxdr_dupstr(struct nfsd4_compoundargs * argp,void * buf,size_t len)142 svcxdr_dupstr(struct nfsd4_compoundargs *argp, void *buf, size_t len)
143 {
144 char *p = svcxdr_tmpalloc(argp, size_add(len, 1));
145
146 if (!p)
147 return NULL;
148 memcpy(p, buf, len);
149 p[len] = '\0';
150 return p;
151 }
152
153 static void *
svcxdr_savemem(struct nfsd4_compoundargs * argp,__be32 * p,size_t len)154 svcxdr_savemem(struct nfsd4_compoundargs *argp, __be32 *p, size_t len)
155 {
156 __be32 *tmp;
157
158 /*
159 * The location of the decoded data item is stable,
160 * so @p is OK to use. This is the common case.
161 */
162 if (p != argp->xdr->scratch.iov_base)
163 return p;
164
165 tmp = svcxdr_tmpalloc(argp, len);
166 if (!tmp)
167 return NULL;
168 memcpy(tmp, p, len);
169 return tmp;
170 }
171
172 /*
173 * NFSv4 basic data type decoders
174 */
175
176 /*
177 * This helper handles variable-length opaques which belong to protocol
178 * elements that this implementation does not support.
179 */
180 static __be32
nfsd4_decode_ignored_string(struct nfsd4_compoundargs * argp,u32 maxlen)181 nfsd4_decode_ignored_string(struct nfsd4_compoundargs *argp, u32 maxlen)
182 {
183 u32 len;
184
185 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
186 return nfserr_bad_xdr;
187 if (maxlen && len > maxlen)
188 return nfserr_bad_xdr;
189 if (!xdr_inline_decode(argp->xdr, len))
190 return nfserr_bad_xdr;
191
192 return nfs_ok;
193 }
194
195 static __be32
nfsd4_decode_opaque(struct nfsd4_compoundargs * argp,struct xdr_netobj * o)196 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
197 {
198 __be32 *p;
199 u32 len;
200
201 if (xdr_stream_decode_u32(argp->xdr, &len) < 0)
202 return nfserr_bad_xdr;
203 if (len == 0 || len > NFS4_OPAQUE_LIMIT)
204 return nfserr_bad_xdr;
205 p = xdr_inline_decode(argp->xdr, len);
206 if (!p)
207 return nfserr_bad_xdr;
208 o->data = svcxdr_savemem(argp, p, len);
209 if (!o->data)
210 return nfserr_jukebox;
211 o->len = len;
212
213 return nfs_ok;
214 }
215
216 static __be32
nfsd4_decode_component4(struct nfsd4_compoundargs * argp,char ** namp,u32 * lenp)217 nfsd4_decode_component4(struct nfsd4_compoundargs *argp, char **namp, u32 *lenp)
218 {
219 __be32 *p, status;
220
221 if (xdr_stream_decode_u32(argp->xdr, lenp) < 0)
222 return nfserr_bad_xdr;
223 p = xdr_inline_decode(argp->xdr, *lenp);
224 if (!p)
225 return nfserr_bad_xdr;
226 status = check_filename((char *)p, *lenp);
227 if (status)
228 return status;
229 *namp = svcxdr_savemem(argp, p, *lenp);
230 if (!*namp)
231 return nfserr_jukebox;
232
233 return nfs_ok;
234 }
235
236 static __be32
nfsd4_decode_nfstime4(struct nfsd4_compoundargs * argp,struct timespec64 * tv)237 nfsd4_decode_nfstime4(struct nfsd4_compoundargs *argp, struct timespec64 *tv)
238 {
239 __be32 *p;
240
241 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 3);
242 if (!p)
243 return nfserr_bad_xdr;
244 p = xdr_decode_hyper(p, &tv->tv_sec);
245 tv->tv_nsec = be32_to_cpup(p++);
246 if (tv->tv_nsec >= (u32)1000000000)
247 return nfserr_inval;
248 return nfs_ok;
249 }
250
251 static __be32
nfsd4_decode_verifier4(struct nfsd4_compoundargs * argp,nfs4_verifier * verf)252 nfsd4_decode_verifier4(struct nfsd4_compoundargs *argp, nfs4_verifier *verf)
253 {
254 __be32 *p;
255
256 p = xdr_inline_decode(argp->xdr, NFS4_VERIFIER_SIZE);
257 if (!p)
258 return nfserr_bad_xdr;
259 memcpy(verf->data, p, sizeof(verf->data));
260 return nfs_ok;
261 }
262
263 /**
264 * nfsd4_decode_bitmap4 - Decode an NFSv4 bitmap4
265 * @argp: NFSv4 compound argument structure
266 * @bmval: pointer to an array of u32's to decode into
267 * @bmlen: size of the @bmval array
268 *
269 * The server needs to return nfs_ok rather than nfserr_bad_xdr when
270 * encountering bitmaps containing bits it does not recognize. This
271 * includes bits in bitmap words past WORDn, where WORDn is the last
272 * bitmap WORD the implementation currently supports. Thus we are
273 * careful here to simply ignore bits in bitmap words that this
274 * implementation has yet to support explicitly.
275 *
276 * Return values:
277 * %nfs_ok: @bmval populated successfully
278 * %nfserr_bad_xdr: the encoded bitmap was invalid
279 */
280 static __be32
nfsd4_decode_bitmap4(struct nfsd4_compoundargs * argp,u32 * bmval,u32 bmlen)281 nfsd4_decode_bitmap4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen)
282 {
283 ssize_t status;
284
285 status = xdr_stream_decode_uint32_array(argp->xdr, bmval, bmlen);
286 return status == -EBADMSG ? nfserr_bad_xdr : nfs_ok;
287 }
288
289 static __be32
nfsd4_decode_nfsace4(struct nfsd4_compoundargs * argp,struct nfs4_ace * ace)290 nfsd4_decode_nfsace4(struct nfsd4_compoundargs *argp, struct nfs4_ace *ace)
291 {
292 __be32 *p, status;
293 u32 length;
294
295 if (xdr_stream_decode_u32(argp->xdr, &ace->type) < 0)
296 return nfserr_bad_xdr;
297 if (xdr_stream_decode_u32(argp->xdr, &ace->flag) < 0)
298 return nfserr_bad_xdr;
299 if (xdr_stream_decode_u32(argp->xdr, &ace->access_mask) < 0)
300 return nfserr_bad_xdr;
301
302 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
303 return nfserr_bad_xdr;
304 p = xdr_inline_decode(argp->xdr, length);
305 if (!p)
306 return nfserr_bad_xdr;
307 ace->whotype = nfs4_acl_get_whotype((char *)p, length);
308 if (ace->whotype != NFS4_ACL_WHO_NAMED)
309 status = nfs_ok;
310 else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
311 status = nfsd_map_name_to_gid(argp->rqstp,
312 (char *)p, length, &ace->who_gid);
313 else
314 status = nfsd_map_name_to_uid(argp->rqstp,
315 (char *)p, length, &ace->who_uid);
316
317 return status;
318 }
319
320 /* A counted array of nfsace4's */
321 static noinline __be32
nfsd4_decode_acl(struct nfsd4_compoundargs * argp,struct nfs4_acl ** acl)322 nfsd4_decode_acl(struct nfsd4_compoundargs *argp, struct nfs4_acl **acl)
323 {
324 struct nfs4_ace *ace;
325 __be32 status;
326 u32 count;
327
328 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
329 return nfserr_bad_xdr;
330
331 if (count > xdr_stream_remaining(argp->xdr) / 20)
332 /*
333 * Even with 4-byte names there wouldn't be
334 * space for that many aces; something fishy is
335 * going on:
336 */
337 return nfserr_fbig;
338
339 *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(count));
340 if (*acl == NULL)
341 return nfserr_jukebox;
342
343 (*acl)->naces = count;
344 for (ace = (*acl)->aces; ace < (*acl)->aces + count; ace++) {
345 status = nfsd4_decode_nfsace4(argp, ace);
346 if (status)
347 return status;
348 }
349
350 return nfs_ok;
351 }
352
353 static noinline __be32
nfsd4_decode_security_label(struct nfsd4_compoundargs * argp,struct xdr_netobj * label)354 nfsd4_decode_security_label(struct nfsd4_compoundargs *argp,
355 struct xdr_netobj *label)
356 {
357 u32 lfs, pi, length;
358 __be32 *p;
359
360 if (xdr_stream_decode_u32(argp->xdr, &lfs) < 0)
361 return nfserr_bad_xdr;
362 if (xdr_stream_decode_u32(argp->xdr, &pi) < 0)
363 return nfserr_bad_xdr;
364
365 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
366 return nfserr_bad_xdr;
367 if (length > NFS4_MAXLABELLEN)
368 return nfserr_badlabel;
369 p = xdr_inline_decode(argp->xdr, length);
370 if (!p)
371 return nfserr_bad_xdr;
372 label->len = length;
373 label->data = svcxdr_dupstr(argp, p, length);
374 if (!label->data)
375 return nfserr_jukebox;
376
377 return nfs_ok;
378 }
379
380 static __be32
nfsd4_decode_fattr4(struct nfsd4_compoundargs * argp,u32 * bmval,u32 bmlen,struct iattr * iattr,struct nfs4_acl ** acl,struct xdr_netobj * label,int * umask)381 nfsd4_decode_fattr4(struct nfsd4_compoundargs *argp, u32 *bmval, u32 bmlen,
382 struct iattr *iattr, struct nfs4_acl **acl,
383 struct xdr_netobj *label, int *umask)
384 {
385 unsigned int starting_pos;
386 u32 attrlist4_count;
387 __be32 *p, status;
388
389 iattr->ia_valid = 0;
390 status = nfsd4_decode_bitmap4(argp, bmval, bmlen);
391 if (status)
392 return nfserr_bad_xdr;
393
394 if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
395 || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
396 || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2) {
397 if (nfsd_attrs_supported(argp->minorversion, bmval))
398 return nfserr_inval;
399 return nfserr_attrnotsupp;
400 }
401
402 if (xdr_stream_decode_u32(argp->xdr, &attrlist4_count) < 0)
403 return nfserr_bad_xdr;
404 starting_pos = xdr_stream_pos(argp->xdr);
405
406 if (bmval[0] & FATTR4_WORD0_SIZE) {
407 u64 size;
408
409 if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
410 return nfserr_bad_xdr;
411 iattr->ia_size = size;
412 iattr->ia_valid |= ATTR_SIZE;
413 }
414 if (bmval[0] & FATTR4_WORD0_ACL) {
415 status = nfsd4_decode_acl(argp, acl);
416 if (status)
417 return status;
418 } else
419 *acl = NULL;
420 if (bmval[1] & FATTR4_WORD1_MODE) {
421 u32 mode;
422
423 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
424 return nfserr_bad_xdr;
425 iattr->ia_mode = mode;
426 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
427 iattr->ia_valid |= ATTR_MODE;
428 }
429 if (bmval[1] & FATTR4_WORD1_OWNER) {
430 u32 length;
431
432 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
433 return nfserr_bad_xdr;
434 p = xdr_inline_decode(argp->xdr, length);
435 if (!p)
436 return nfserr_bad_xdr;
437 status = nfsd_map_name_to_uid(argp->rqstp, (char *)p, length,
438 &iattr->ia_uid);
439 if (status)
440 return status;
441 iattr->ia_valid |= ATTR_UID;
442 }
443 if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
444 u32 length;
445
446 if (xdr_stream_decode_u32(argp->xdr, &length) < 0)
447 return nfserr_bad_xdr;
448 p = xdr_inline_decode(argp->xdr, length);
449 if (!p)
450 return nfserr_bad_xdr;
451 status = nfsd_map_name_to_gid(argp->rqstp, (char *)p, length,
452 &iattr->ia_gid);
453 if (status)
454 return status;
455 iattr->ia_valid |= ATTR_GID;
456 }
457 if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
458 u32 set_it;
459
460 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
461 return nfserr_bad_xdr;
462 switch (set_it) {
463 case NFS4_SET_TO_CLIENT_TIME:
464 status = nfsd4_decode_nfstime4(argp, &iattr->ia_atime);
465 if (status)
466 return status;
467 iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
468 break;
469 case NFS4_SET_TO_SERVER_TIME:
470 iattr->ia_valid |= ATTR_ATIME;
471 break;
472 default:
473 return nfserr_bad_xdr;
474 }
475 }
476 if (bmval[1] & FATTR4_WORD1_TIME_CREATE) {
477 struct timespec64 ts;
478
479 /* No Linux filesystem supports setting this attribute. */
480 bmval[1] &= ~FATTR4_WORD1_TIME_CREATE;
481 status = nfsd4_decode_nfstime4(argp, &ts);
482 if (status)
483 return status;
484 }
485 if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
486 u32 set_it;
487
488 if (xdr_stream_decode_u32(argp->xdr, &set_it) < 0)
489 return nfserr_bad_xdr;
490 switch (set_it) {
491 case NFS4_SET_TO_CLIENT_TIME:
492 status = nfsd4_decode_nfstime4(argp, &iattr->ia_mtime);
493 if (status)
494 return status;
495 iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
496 break;
497 case NFS4_SET_TO_SERVER_TIME:
498 iattr->ia_valid |= ATTR_MTIME;
499 break;
500 default:
501 return nfserr_bad_xdr;
502 }
503 }
504 label->len = 0;
505 if (IS_ENABLED(CONFIG_NFSD_V4_SECURITY_LABEL) &&
506 bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
507 status = nfsd4_decode_security_label(argp, label);
508 if (status)
509 return status;
510 }
511 if (bmval[2] & FATTR4_WORD2_MODE_UMASK) {
512 u32 mode, mask;
513
514 if (!umask)
515 return nfserr_bad_xdr;
516 if (xdr_stream_decode_u32(argp->xdr, &mode) < 0)
517 return nfserr_bad_xdr;
518 iattr->ia_mode = mode & (S_IFMT | S_IALLUGO);
519 if (xdr_stream_decode_u32(argp->xdr, &mask) < 0)
520 return nfserr_bad_xdr;
521 *umask = mask & S_IRWXUGO;
522 iattr->ia_valid |= ATTR_MODE;
523 }
524 if (bmval[2] & FATTR4_WORD2_TIME_DELEG_ACCESS) {
525 fattr4_time_deleg_access access;
526
527 if (!xdrgen_decode_fattr4_time_deleg_access(argp->xdr, &access))
528 return nfserr_bad_xdr;
529 iattr->ia_atime.tv_sec = access.seconds;
530 iattr->ia_atime.tv_nsec = access.nseconds;
531 iattr->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET | ATTR_DELEG;
532 }
533 if (bmval[2] & FATTR4_WORD2_TIME_DELEG_MODIFY) {
534 fattr4_time_deleg_modify modify;
535
536 if (!xdrgen_decode_fattr4_time_deleg_modify(argp->xdr, &modify))
537 return nfserr_bad_xdr;
538 iattr->ia_mtime.tv_sec = modify.seconds;
539 iattr->ia_mtime.tv_nsec = modify.nseconds;
540 iattr->ia_ctime.tv_sec = modify.seconds;
541 iattr->ia_ctime.tv_nsec = modify.seconds;
542 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME | ATTR_MTIME_SET | ATTR_DELEG;
543 }
544
545 /* request sanity: did attrlist4 contain the expected number of words? */
546 if (attrlist4_count != xdr_stream_pos(argp->xdr) - starting_pos)
547 return nfserr_bad_xdr;
548
549 return nfs_ok;
550 }
551
552 static __be32
nfsd4_decode_stateid4(struct nfsd4_compoundargs * argp,stateid_t * sid)553 nfsd4_decode_stateid4(struct nfsd4_compoundargs *argp, stateid_t *sid)
554 {
555 __be32 *p;
556
557 p = xdr_inline_decode(argp->xdr, NFS4_STATEID_SIZE);
558 if (!p)
559 return nfserr_bad_xdr;
560 sid->si_generation = be32_to_cpup(p++);
561 memcpy(&sid->si_opaque, p, sizeof(sid->si_opaque));
562 return nfs_ok;
563 }
564
565 static __be32
nfsd4_decode_clientid4(struct nfsd4_compoundargs * argp,clientid_t * clientid)566 nfsd4_decode_clientid4(struct nfsd4_compoundargs *argp, clientid_t *clientid)
567 {
568 __be32 *p;
569
570 p = xdr_inline_decode(argp->xdr, sizeof(__be64));
571 if (!p)
572 return nfserr_bad_xdr;
573 memcpy(clientid, p, sizeof(*clientid));
574 return nfs_ok;
575 }
576
577 static __be32
nfsd4_decode_state_owner4(struct nfsd4_compoundargs * argp,clientid_t * clientid,struct xdr_netobj * owner)578 nfsd4_decode_state_owner4(struct nfsd4_compoundargs *argp,
579 clientid_t *clientid, struct xdr_netobj *owner)
580 {
581 __be32 status;
582
583 status = nfsd4_decode_clientid4(argp, clientid);
584 if (status)
585 return status;
586 return nfsd4_decode_opaque(argp, owner);
587 }
588
589 #ifdef CONFIG_NFSD_PNFS
590 static __be32
nfsd4_decode_deviceid4(struct nfsd4_compoundargs * argp,struct nfsd4_deviceid * devid)591 nfsd4_decode_deviceid4(struct nfsd4_compoundargs *argp,
592 struct nfsd4_deviceid *devid)
593 {
594 __be32 *p;
595
596 p = xdr_inline_decode(argp->xdr, NFS4_DEVICEID4_SIZE);
597 if (!p)
598 return nfserr_bad_xdr;
599 memcpy(devid, p, sizeof(*devid));
600 return nfs_ok;
601 }
602
603 static __be32
nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs * argp,struct nfsd4_layoutcommit * lcp)604 nfsd4_decode_layoutupdate4(struct nfsd4_compoundargs *argp,
605 struct nfsd4_layoutcommit *lcp)
606 {
607 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_layout_type) < 0)
608 return nfserr_bad_xdr;
609 if (lcp->lc_layout_type < LAYOUT_NFSV4_1_FILES)
610 return nfserr_bad_xdr;
611 if (lcp->lc_layout_type >= LAYOUT_TYPE_MAX)
612 return nfserr_bad_xdr;
613
614 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_up_len) < 0)
615 return nfserr_bad_xdr;
616 if (lcp->lc_up_len > 0) {
617 lcp->lc_up_layout = xdr_inline_decode(argp->xdr, lcp->lc_up_len);
618 if (!lcp->lc_up_layout)
619 return nfserr_bad_xdr;
620 }
621
622 return nfs_ok;
623 }
624
625 static __be32
nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs * argp,struct nfsd4_layoutreturn * lrp)626 nfsd4_decode_layoutreturn4(struct nfsd4_compoundargs *argp,
627 struct nfsd4_layoutreturn *lrp)
628 {
629 __be32 status;
630
631 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_return_type) < 0)
632 return nfserr_bad_xdr;
633 switch (lrp->lr_return_type) {
634 case RETURN_FILE:
635 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.offset) < 0)
636 return nfserr_bad_xdr;
637 if (xdr_stream_decode_u64(argp->xdr, &lrp->lr_seg.length) < 0)
638 return nfserr_bad_xdr;
639 status = nfsd4_decode_stateid4(argp, &lrp->lr_sid);
640 if (status)
641 return status;
642 if (xdr_stream_decode_u32(argp->xdr, &lrp->lrf_body_len) < 0)
643 return nfserr_bad_xdr;
644 if (lrp->lrf_body_len > 0) {
645 lrp->lrf_body = xdr_inline_decode(argp->xdr, lrp->lrf_body_len);
646 if (!lrp->lrf_body)
647 return nfserr_bad_xdr;
648 }
649 break;
650 case RETURN_FSID:
651 case RETURN_ALL:
652 lrp->lr_seg.offset = 0;
653 lrp->lr_seg.length = NFS4_MAX_UINT64;
654 break;
655 default:
656 return nfserr_bad_xdr;
657 }
658
659 return nfs_ok;
660 }
661
662 #endif /* CONFIG_NFSD_PNFS */
663
664 static __be32
nfsd4_decode_sessionid4(struct nfsd4_compoundargs * argp,struct nfs4_sessionid * sessionid)665 nfsd4_decode_sessionid4(struct nfsd4_compoundargs *argp,
666 struct nfs4_sessionid *sessionid)
667 {
668 __be32 *p;
669
670 p = xdr_inline_decode(argp->xdr, NFS4_MAX_SESSIONID_LEN);
671 if (!p)
672 return nfserr_bad_xdr;
673 memcpy(sessionid->data, p, sizeof(sessionid->data));
674 return nfs_ok;
675 }
676
677 /* Defined in Appendix A of RFC 5531 */
678 static __be32
nfsd4_decode_authsys_parms(struct nfsd4_compoundargs * argp,struct nfsd4_cb_sec * cbs)679 nfsd4_decode_authsys_parms(struct nfsd4_compoundargs *argp,
680 struct nfsd4_cb_sec *cbs)
681 {
682 u32 stamp, gidcount, uid, gid;
683 __be32 *p, status;
684
685 if (xdr_stream_decode_u32(argp->xdr, &stamp) < 0)
686 return nfserr_bad_xdr;
687 /* machine name */
688 status = nfsd4_decode_ignored_string(argp, 255);
689 if (status)
690 return status;
691 if (xdr_stream_decode_u32(argp->xdr, &uid) < 0)
692 return nfserr_bad_xdr;
693 if (xdr_stream_decode_u32(argp->xdr, &gid) < 0)
694 return nfserr_bad_xdr;
695 if (xdr_stream_decode_u32(argp->xdr, &gidcount) < 0)
696 return nfserr_bad_xdr;
697 if (gidcount > 16)
698 return nfserr_bad_xdr;
699 p = xdr_inline_decode(argp->xdr, gidcount << 2);
700 if (!p)
701 return nfserr_bad_xdr;
702 if (cbs->flavor == (u32)(-1)) {
703 struct user_namespace *userns = nfsd_user_namespace(argp->rqstp);
704
705 kuid_t kuid = make_kuid(userns, uid);
706 kgid_t kgid = make_kgid(userns, gid);
707 if (uid_valid(kuid) && gid_valid(kgid)) {
708 cbs->uid = kuid;
709 cbs->gid = kgid;
710 cbs->flavor = RPC_AUTH_UNIX;
711 } else {
712 dprintk("RPC_AUTH_UNIX with invalid uid or gid, ignoring!\n");
713 }
714 }
715
716 return nfs_ok;
717 }
718
719 static __be32
nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs * argp,struct nfsd4_cb_sec * cbs)720 nfsd4_decode_gss_cb_handles4(struct nfsd4_compoundargs *argp,
721 struct nfsd4_cb_sec *cbs)
722 {
723 __be32 status;
724 u32 service;
725
726 dprintk("RPC_AUTH_GSS callback secflavor not supported!\n");
727
728 if (xdr_stream_decode_u32(argp->xdr, &service) < 0)
729 return nfserr_bad_xdr;
730 if (service < RPC_GSS_SVC_NONE || service > RPC_GSS_SVC_PRIVACY)
731 return nfserr_bad_xdr;
732 /* gcbp_handle_from_server */
733 status = nfsd4_decode_ignored_string(argp, 0);
734 if (status)
735 return status;
736 /* gcbp_handle_from_client */
737 status = nfsd4_decode_ignored_string(argp, 0);
738 if (status)
739 return status;
740
741 return nfs_ok;
742 }
743
744 /* a counted array of callback_sec_parms4 items */
745 static __be32
nfsd4_decode_cb_sec(struct nfsd4_compoundargs * argp,struct nfsd4_cb_sec * cbs)746 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
747 {
748 u32 i, secflavor, nr_secflavs;
749 __be32 status;
750
751 /* callback_sec_params4 */
752 if (xdr_stream_decode_u32(argp->xdr, &nr_secflavs) < 0)
753 return nfserr_bad_xdr;
754 if (nr_secflavs)
755 cbs->flavor = (u32)(-1);
756 else
757 /* Is this legal? Be generous, take it to mean AUTH_NONE: */
758 cbs->flavor = 0;
759
760 for (i = 0; i < nr_secflavs; ++i) {
761 if (xdr_stream_decode_u32(argp->xdr, &secflavor) < 0)
762 return nfserr_bad_xdr;
763 switch (secflavor) {
764 case RPC_AUTH_NULL:
765 /* void */
766 if (cbs->flavor == (u32)(-1))
767 cbs->flavor = RPC_AUTH_NULL;
768 break;
769 case RPC_AUTH_UNIX:
770 status = nfsd4_decode_authsys_parms(argp, cbs);
771 if (status)
772 return status;
773 break;
774 case RPC_AUTH_GSS:
775 status = nfsd4_decode_gss_cb_handles4(argp, cbs);
776 if (status)
777 return status;
778 break;
779 default:
780 return nfserr_inval;
781 }
782 }
783
784 return nfs_ok;
785 }
786
787
788 /*
789 * NFSv4 operation argument decoders
790 */
791
792 static __be32
nfsd4_decode_access(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)793 nfsd4_decode_access(struct nfsd4_compoundargs *argp,
794 union nfsd4_op_u *u)
795 {
796 struct nfsd4_access *access = &u->access;
797 if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
798 return nfserr_bad_xdr;
799 return nfs_ok;
800 }
801
802 static __be32
nfsd4_decode_close(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)803 nfsd4_decode_close(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
804 {
805 struct nfsd4_close *close = &u->close;
806 if (xdr_stream_decode_u32(argp->xdr, &close->cl_seqid) < 0)
807 return nfserr_bad_xdr;
808 return nfsd4_decode_stateid4(argp, &close->cl_stateid);
809 }
810
811
812 static __be32
nfsd4_decode_commit(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)813 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
814 {
815 struct nfsd4_commit *commit = &u->commit;
816 if (xdr_stream_decode_u64(argp->xdr, &commit->co_offset) < 0)
817 return nfserr_bad_xdr;
818 if (xdr_stream_decode_u32(argp->xdr, &commit->co_count) < 0)
819 return nfserr_bad_xdr;
820 memset(&commit->co_verf, 0, sizeof(commit->co_verf));
821 return nfs_ok;
822 }
823
824 static __be32
nfsd4_decode_create(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)825 nfsd4_decode_create(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
826 {
827 struct nfsd4_create *create = &u->create;
828 __be32 *p, status;
829
830 memset(create, 0, sizeof(*create));
831 if (xdr_stream_decode_u32(argp->xdr, &create->cr_type) < 0)
832 return nfserr_bad_xdr;
833 switch (create->cr_type) {
834 case NF4LNK:
835 if (xdr_stream_decode_u32(argp->xdr, &create->cr_datalen) < 0)
836 return nfserr_bad_xdr;
837 p = xdr_inline_decode(argp->xdr, create->cr_datalen);
838 if (!p)
839 return nfserr_bad_xdr;
840 create->cr_data = svcxdr_dupstr(argp, p, create->cr_datalen);
841 if (!create->cr_data)
842 return nfserr_jukebox;
843 break;
844 case NF4BLK:
845 case NF4CHR:
846 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata1) < 0)
847 return nfserr_bad_xdr;
848 if (xdr_stream_decode_u32(argp->xdr, &create->cr_specdata2) < 0)
849 return nfserr_bad_xdr;
850 break;
851 case NF4SOCK:
852 case NF4FIFO:
853 case NF4DIR:
854 default:
855 break;
856 }
857 status = nfsd4_decode_component4(argp, &create->cr_name,
858 &create->cr_namelen);
859 if (status)
860 return status;
861 status = nfsd4_decode_fattr4(argp, create->cr_bmval,
862 ARRAY_SIZE(create->cr_bmval),
863 &create->cr_iattr, &create->cr_acl,
864 &create->cr_label, &create->cr_umask);
865 if (status)
866 return status;
867
868 return nfs_ok;
869 }
870
871 static inline __be32
nfsd4_decode_delegreturn(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)872 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
873 {
874 struct nfsd4_delegreturn *dr = &u->delegreturn;
875 return nfsd4_decode_stateid4(argp, &dr->dr_stateid);
876 }
877
878 static inline __be32
nfsd4_decode_getattr(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)879 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
880 {
881 struct nfsd4_getattr *getattr = &u->getattr;
882 memset(getattr, 0, sizeof(*getattr));
883 return nfsd4_decode_bitmap4(argp, getattr->ga_bmval,
884 ARRAY_SIZE(getattr->ga_bmval));
885 }
886
887 static __be32
nfsd4_decode_link(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)888 nfsd4_decode_link(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
889 {
890 struct nfsd4_link *link = &u->link;
891 memset(link, 0, sizeof(*link));
892 return nfsd4_decode_component4(argp, &link->li_name, &link->li_namelen);
893 }
894
895 static __be32
nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs * argp,struct nfsd4_lock * lock)896 nfsd4_decode_open_to_lock_owner4(struct nfsd4_compoundargs *argp,
897 struct nfsd4_lock *lock)
898 {
899 __be32 status;
900
901 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_open_seqid) < 0)
902 return nfserr_bad_xdr;
903 status = nfsd4_decode_stateid4(argp, &lock->lk_new_open_stateid);
904 if (status)
905 return status;
906 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_new_lock_seqid) < 0)
907 return nfserr_bad_xdr;
908 return nfsd4_decode_state_owner4(argp, &lock->lk_new_clientid,
909 &lock->lk_new_owner);
910 }
911
912 static __be32
nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs * argp,struct nfsd4_lock * lock)913 nfsd4_decode_exist_lock_owner4(struct nfsd4_compoundargs *argp,
914 struct nfsd4_lock *lock)
915 {
916 __be32 status;
917
918 status = nfsd4_decode_stateid4(argp, &lock->lk_old_lock_stateid);
919 if (status)
920 return status;
921 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_old_lock_seqid) < 0)
922 return nfserr_bad_xdr;
923
924 return nfs_ok;
925 }
926
927 static __be32
nfsd4_decode_locker4(struct nfsd4_compoundargs * argp,struct nfsd4_lock * lock)928 nfsd4_decode_locker4(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
929 {
930 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_is_new) < 0)
931 return nfserr_bad_xdr;
932 if (lock->lk_is_new)
933 return nfsd4_decode_open_to_lock_owner4(argp, lock);
934 return nfsd4_decode_exist_lock_owner4(argp, lock);
935 }
936
937 static __be32
nfsd4_decode_lock(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)938 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
939 {
940 struct nfsd4_lock *lock = &u->lock;
941 memset(lock, 0, sizeof(*lock));
942 if (xdr_stream_decode_u32(argp->xdr, &lock->lk_type) < 0)
943 return nfserr_bad_xdr;
944 if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
945 return nfserr_bad_xdr;
946 if (xdr_stream_decode_bool(argp->xdr, &lock->lk_reclaim) < 0)
947 return nfserr_bad_xdr;
948 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_offset) < 0)
949 return nfserr_bad_xdr;
950 if (xdr_stream_decode_u64(argp->xdr, &lock->lk_length) < 0)
951 return nfserr_bad_xdr;
952 return nfsd4_decode_locker4(argp, lock);
953 }
954
955 static __be32
nfsd4_decode_lockt(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)956 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
957 {
958 struct nfsd4_lockt *lockt = &u->lockt;
959 memset(lockt, 0, sizeof(*lockt));
960 if (xdr_stream_decode_u32(argp->xdr, &lockt->lt_type) < 0)
961 return nfserr_bad_xdr;
962 if ((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
963 return nfserr_bad_xdr;
964 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_offset) < 0)
965 return nfserr_bad_xdr;
966 if (xdr_stream_decode_u64(argp->xdr, &lockt->lt_length) < 0)
967 return nfserr_bad_xdr;
968 return nfsd4_decode_state_owner4(argp, &lockt->lt_clientid,
969 &lockt->lt_owner);
970 }
971
972 static __be32
nfsd4_decode_locku(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)973 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
974 {
975 struct nfsd4_locku *locku = &u->locku;
976 __be32 status;
977
978 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_type) < 0)
979 return nfserr_bad_xdr;
980 if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
981 return nfserr_bad_xdr;
982 if (xdr_stream_decode_u32(argp->xdr, &locku->lu_seqid) < 0)
983 return nfserr_bad_xdr;
984 status = nfsd4_decode_stateid4(argp, &locku->lu_stateid);
985 if (status)
986 return status;
987 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_offset) < 0)
988 return nfserr_bad_xdr;
989 if (xdr_stream_decode_u64(argp->xdr, &locku->lu_length) < 0)
990 return nfserr_bad_xdr;
991
992 return nfs_ok;
993 }
994
995 static __be32
nfsd4_decode_lookup(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)996 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
997 {
998 struct nfsd4_lookup *lookup = &u->lookup;
999 return nfsd4_decode_component4(argp, &lookup->lo_name, &lookup->lo_len);
1000 }
1001
1002 static __be32
nfsd4_decode_createhow4(struct nfsd4_compoundargs * argp,struct nfsd4_open * open)1003 nfsd4_decode_createhow4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1004 {
1005 __be32 status;
1006
1007 if (xdr_stream_decode_u32(argp->xdr, &open->op_createmode) < 0)
1008 return nfserr_bad_xdr;
1009 switch (open->op_createmode) {
1010 case NFS4_CREATE_UNCHECKED:
1011 case NFS4_CREATE_GUARDED:
1012 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1013 ARRAY_SIZE(open->op_bmval),
1014 &open->op_iattr, &open->op_acl,
1015 &open->op_label, &open->op_umask);
1016 if (status)
1017 return status;
1018 break;
1019 case NFS4_CREATE_EXCLUSIVE:
1020 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1021 if (status)
1022 return status;
1023 break;
1024 case NFS4_CREATE_EXCLUSIVE4_1:
1025 if (argp->minorversion < 1)
1026 return nfserr_bad_xdr;
1027 status = nfsd4_decode_verifier4(argp, &open->op_verf);
1028 if (status)
1029 return status;
1030 status = nfsd4_decode_fattr4(argp, open->op_bmval,
1031 ARRAY_SIZE(open->op_bmval),
1032 &open->op_iattr, &open->op_acl,
1033 &open->op_label, &open->op_umask);
1034 if (status)
1035 return status;
1036 break;
1037 default:
1038 return nfserr_bad_xdr;
1039 }
1040
1041 return nfs_ok;
1042 }
1043
1044 static __be32
nfsd4_decode_openflag4(struct nfsd4_compoundargs * argp,struct nfsd4_open * open)1045 nfsd4_decode_openflag4(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
1046 {
1047 __be32 status;
1048
1049 if (xdr_stream_decode_u32(argp->xdr, &open->op_create) < 0)
1050 return nfserr_bad_xdr;
1051 switch (open->op_create) {
1052 case NFS4_OPEN_NOCREATE:
1053 break;
1054 case NFS4_OPEN_CREATE:
1055 status = nfsd4_decode_createhow4(argp, open);
1056 if (status)
1057 return status;
1058 break;
1059 default:
1060 return nfserr_bad_xdr;
1061 }
1062
1063 return nfs_ok;
1064 }
1065
nfsd4_decode_share_access(struct nfsd4_compoundargs * argp,u32 * share_access,u32 * deleg_want,u32 * deleg_when)1066 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
1067 {
1068 u32 w;
1069
1070 if (xdr_stream_decode_u32(argp->xdr, &w) < 0)
1071 return nfserr_bad_xdr;
1072 *share_access = w & NFS4_SHARE_ACCESS_MASK;
1073 *deleg_want = w & NFS4_SHARE_WANT_MASK;
1074 if (deleg_when)
1075 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
1076
1077 switch (w & NFS4_SHARE_ACCESS_MASK) {
1078 case NFS4_SHARE_ACCESS_READ:
1079 case NFS4_SHARE_ACCESS_WRITE:
1080 case NFS4_SHARE_ACCESS_BOTH:
1081 break;
1082 default:
1083 return nfserr_bad_xdr;
1084 }
1085 w &= ~NFS4_SHARE_ACCESS_MASK;
1086 if (!w)
1087 return nfs_ok;
1088 if (!argp->minorversion)
1089 return nfserr_bad_xdr;
1090 switch (w & NFS4_SHARE_WANT_TYPE_MASK) {
1091 case OPEN4_SHARE_ACCESS_WANT_NO_PREFERENCE:
1092 case OPEN4_SHARE_ACCESS_WANT_READ_DELEG:
1093 case OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG:
1094 case OPEN4_SHARE_ACCESS_WANT_ANY_DELEG:
1095 case OPEN4_SHARE_ACCESS_WANT_NO_DELEG:
1096 case OPEN4_SHARE_ACCESS_WANT_CANCEL:
1097 break;
1098 default:
1099 return nfserr_bad_xdr;
1100 }
1101 w &= ~NFS4_SHARE_WANT_MASK;
1102 if (!w)
1103 return nfs_ok;
1104
1105 if (!deleg_when) /* open_downgrade */
1106 return nfserr_inval;
1107 switch (w) {
1108 case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
1109 case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
1110 case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
1111 NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
1112 return nfs_ok;
1113 }
1114 return nfserr_bad_xdr;
1115 }
1116
nfsd4_decode_share_deny(struct nfsd4_compoundargs * argp,u32 * x)1117 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
1118 {
1119 if (xdr_stream_decode_u32(argp->xdr, x) < 0)
1120 return nfserr_bad_xdr;
1121 /* Note: unlike access bits, deny bits may be zero. */
1122 if (*x & ~NFS4_SHARE_DENY_BOTH)
1123 return nfserr_bad_xdr;
1124
1125 return nfs_ok;
1126 }
1127
1128 static __be32
nfsd4_decode_open_claim4(struct nfsd4_compoundargs * argp,struct nfsd4_open * open)1129 nfsd4_decode_open_claim4(struct nfsd4_compoundargs *argp,
1130 struct nfsd4_open *open)
1131 {
1132 __be32 status;
1133
1134 if (xdr_stream_decode_u32(argp->xdr, &open->op_claim_type) < 0)
1135 return nfserr_bad_xdr;
1136 switch (open->op_claim_type) {
1137 case NFS4_OPEN_CLAIM_NULL:
1138 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1139 status = nfsd4_decode_component4(argp, &open->op_fname,
1140 &open->op_fnamelen);
1141 if (status)
1142 return status;
1143 break;
1144 case NFS4_OPEN_CLAIM_PREVIOUS:
1145 if (xdr_stream_decode_u32(argp->xdr, &open->op_delegate_type) < 0)
1146 return nfserr_bad_xdr;
1147 break;
1148 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1149 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1150 if (status)
1151 return status;
1152 status = nfsd4_decode_component4(argp, &open->op_fname,
1153 &open->op_fnamelen);
1154 if (status)
1155 return status;
1156 break;
1157 case NFS4_OPEN_CLAIM_FH:
1158 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1159 if (argp->minorversion < 1)
1160 return nfserr_bad_xdr;
1161 /* void */
1162 break;
1163 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1164 if (argp->minorversion < 1)
1165 return nfserr_bad_xdr;
1166 status = nfsd4_decode_stateid4(argp, &open->op_delegate_stateid);
1167 if (status)
1168 return status;
1169 break;
1170 default:
1171 return nfserr_bad_xdr;
1172 }
1173
1174 return nfs_ok;
1175 }
1176
1177 static __be32
nfsd4_decode_open(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1178 nfsd4_decode_open(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1179 {
1180 struct nfsd4_open *open = &u->open;
1181 __be32 status;
1182 u32 dummy;
1183
1184 memset(open, 0, sizeof(*open));
1185
1186 if (xdr_stream_decode_u32(argp->xdr, &open->op_seqid) < 0)
1187 return nfserr_bad_xdr;
1188 /* deleg_want is ignored */
1189 status = nfsd4_decode_share_access(argp, &open->op_share_access,
1190 &open->op_deleg_want, &dummy);
1191 if (status)
1192 return status;
1193 status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
1194 if (status)
1195 return status;
1196 status = nfsd4_decode_state_owner4(argp, &open->op_clientid,
1197 &open->op_owner);
1198 if (status)
1199 return status;
1200 status = nfsd4_decode_openflag4(argp, open);
1201 if (status)
1202 return status;
1203 return nfsd4_decode_open_claim4(argp, open);
1204 }
1205
1206 static __be32
nfsd4_decode_open_confirm(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1207 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp,
1208 union nfsd4_op_u *u)
1209 {
1210 struct nfsd4_open_confirm *open_conf = &u->open_confirm;
1211 __be32 status;
1212
1213 if (argp->minorversion >= 1)
1214 return nfserr_notsupp;
1215
1216 status = nfsd4_decode_stateid4(argp, &open_conf->oc_req_stateid);
1217 if (status)
1218 return status;
1219 if (xdr_stream_decode_u32(argp->xdr, &open_conf->oc_seqid) < 0)
1220 return nfserr_bad_xdr;
1221
1222 memset(&open_conf->oc_resp_stateid, 0,
1223 sizeof(open_conf->oc_resp_stateid));
1224 return nfs_ok;
1225 }
1226
1227 static __be32
nfsd4_decode_open_downgrade(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1228 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp,
1229 union nfsd4_op_u *u)
1230 {
1231 struct nfsd4_open_downgrade *open_down = &u->open_downgrade;
1232 __be32 status;
1233
1234 memset(open_down, 0, sizeof(*open_down));
1235 status = nfsd4_decode_stateid4(argp, &open_down->od_stateid);
1236 if (status)
1237 return status;
1238 if (xdr_stream_decode_u32(argp->xdr, &open_down->od_seqid) < 0)
1239 return nfserr_bad_xdr;
1240 /* deleg_want is ignored */
1241 status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
1242 &open_down->od_deleg_want, NULL);
1243 if (status)
1244 return status;
1245 return nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
1246 }
1247
1248 static __be32
nfsd4_decode_putfh(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1249 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1250 {
1251 struct nfsd4_putfh *putfh = &u->putfh;
1252 __be32 *p;
1253
1254 if (xdr_stream_decode_u32(argp->xdr, &putfh->pf_fhlen) < 0)
1255 return nfserr_bad_xdr;
1256 if (putfh->pf_fhlen > NFS4_FHSIZE)
1257 return nfserr_bad_xdr;
1258 p = xdr_inline_decode(argp->xdr, putfh->pf_fhlen);
1259 if (!p)
1260 return nfserr_bad_xdr;
1261 putfh->pf_fhval = svcxdr_savemem(argp, p, putfh->pf_fhlen);
1262 if (!putfh->pf_fhval)
1263 return nfserr_jukebox;
1264
1265 putfh->no_verify = false;
1266 return nfs_ok;
1267 }
1268
1269 static __be32
nfsd4_decode_read(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1270 nfsd4_decode_read(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1271 {
1272 struct nfsd4_read *read = &u->read;
1273 __be32 status;
1274
1275 memset(read, 0, sizeof(*read));
1276 status = nfsd4_decode_stateid4(argp, &read->rd_stateid);
1277 if (status)
1278 return status;
1279 if (xdr_stream_decode_u64(argp->xdr, &read->rd_offset) < 0)
1280 return nfserr_bad_xdr;
1281 if (xdr_stream_decode_u32(argp->xdr, &read->rd_length) < 0)
1282 return nfserr_bad_xdr;
1283
1284 return nfs_ok;
1285 }
1286
1287 static __be32
nfsd4_decode_readdir(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1288 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1289 {
1290 struct nfsd4_readdir *readdir = &u->readdir;
1291 __be32 status;
1292
1293 memset(readdir, 0, sizeof(*readdir));
1294 if (xdr_stream_decode_u64(argp->xdr, &readdir->rd_cookie) < 0)
1295 return nfserr_bad_xdr;
1296 status = nfsd4_decode_verifier4(argp, &readdir->rd_verf);
1297 if (status)
1298 return status;
1299 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_dircount) < 0)
1300 return nfserr_bad_xdr;
1301 if (xdr_stream_decode_u32(argp->xdr, &readdir->rd_maxcount) < 0)
1302 return nfserr_bad_xdr;
1303 if (xdr_stream_decode_uint32_array(argp->xdr, readdir->rd_bmval,
1304 ARRAY_SIZE(readdir->rd_bmval)) < 0)
1305 return nfserr_bad_xdr;
1306
1307 return nfs_ok;
1308 }
1309
1310 static __be32
nfsd4_decode_remove(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1311 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1312 {
1313 struct nfsd4_remove *remove = &u->remove;
1314 memset(&remove->rm_cinfo, 0, sizeof(remove->rm_cinfo));
1315 return nfsd4_decode_component4(argp, &remove->rm_name, &remove->rm_namelen);
1316 }
1317
1318 static __be32
nfsd4_decode_rename(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1319 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1320 {
1321 struct nfsd4_rename *rename = &u->rename;
1322 __be32 status;
1323
1324 memset(rename, 0, sizeof(*rename));
1325 status = nfsd4_decode_component4(argp, &rename->rn_sname, &rename->rn_snamelen);
1326 if (status)
1327 return status;
1328 return nfsd4_decode_component4(argp, &rename->rn_tname, &rename->rn_tnamelen);
1329 }
1330
1331 static __be32
nfsd4_decode_renew(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1332 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1333 {
1334 clientid_t *clientid = &u->renew;
1335 return nfsd4_decode_clientid4(argp, clientid);
1336 }
1337
1338 static __be32
nfsd4_decode_secinfo(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1339 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1340 union nfsd4_op_u *u)
1341 {
1342 struct nfsd4_secinfo *secinfo = &u->secinfo;
1343 secinfo->si_exp = NULL;
1344 return nfsd4_decode_component4(argp, &secinfo->si_name, &secinfo->si_namelen);
1345 }
1346
1347 static __be32
nfsd4_decode_setattr(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1348 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1349 {
1350 struct nfsd4_setattr *setattr = &u->setattr;
1351 __be32 status;
1352
1353 memset(setattr, 0, sizeof(*setattr));
1354 status = nfsd4_decode_stateid4(argp, &setattr->sa_stateid);
1355 if (status)
1356 return status;
1357 return nfsd4_decode_fattr4(argp, setattr->sa_bmval,
1358 ARRAY_SIZE(setattr->sa_bmval),
1359 &setattr->sa_iattr, &setattr->sa_acl,
1360 &setattr->sa_label, NULL);
1361 }
1362
1363 static __be32
nfsd4_decode_setclientid(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1364 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1365 {
1366 struct nfsd4_setclientid *setclientid = &u->setclientid;
1367 __be32 *p, status;
1368
1369 memset(setclientid, 0, sizeof(*setclientid));
1370
1371 if (argp->minorversion >= 1)
1372 return nfserr_notsupp;
1373
1374 status = nfsd4_decode_verifier4(argp, &setclientid->se_verf);
1375 if (status)
1376 return status;
1377 status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1378 if (status)
1379 return status;
1380 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_prog) < 0)
1381 return nfserr_bad_xdr;
1382 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_netid_len) < 0)
1383 return nfserr_bad_xdr;
1384 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_netid_len);
1385 if (!p)
1386 return nfserr_bad_xdr;
1387 setclientid->se_callback_netid_val = svcxdr_savemem(argp, p,
1388 setclientid->se_callback_netid_len);
1389 if (!setclientid->se_callback_netid_val)
1390 return nfserr_jukebox;
1391
1392 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_addr_len) < 0)
1393 return nfserr_bad_xdr;
1394 p = xdr_inline_decode(argp->xdr, setclientid->se_callback_addr_len);
1395 if (!p)
1396 return nfserr_bad_xdr;
1397 setclientid->se_callback_addr_val = svcxdr_savemem(argp, p,
1398 setclientid->se_callback_addr_len);
1399 if (!setclientid->se_callback_addr_val)
1400 return nfserr_jukebox;
1401 if (xdr_stream_decode_u32(argp->xdr, &setclientid->se_callback_ident) < 0)
1402 return nfserr_bad_xdr;
1403
1404 return nfs_ok;
1405 }
1406
1407 static __be32
nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1408 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp,
1409 union nfsd4_op_u *u)
1410 {
1411 struct nfsd4_setclientid_confirm *scd_c = &u->setclientid_confirm;
1412 __be32 status;
1413
1414 if (argp->minorversion >= 1)
1415 return nfserr_notsupp;
1416
1417 status = nfsd4_decode_clientid4(argp, &scd_c->sc_clientid);
1418 if (status)
1419 return status;
1420 return nfsd4_decode_verifier4(argp, &scd_c->sc_confirm);
1421 }
1422
1423 /* Also used for NVERIFY */
1424 static __be32
nfsd4_decode_verify(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1425 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1426 {
1427 struct nfsd4_verify *verify = &u->verify;
1428 __be32 *p, status;
1429
1430 memset(verify, 0, sizeof(*verify));
1431
1432 status = nfsd4_decode_bitmap4(argp, verify->ve_bmval,
1433 ARRAY_SIZE(verify->ve_bmval));
1434 if (status)
1435 return status;
1436
1437 /* For convenience's sake, we compare raw xdr'd attributes in
1438 * nfsd4_proc_verify */
1439
1440 if (xdr_stream_decode_u32(argp->xdr, &verify->ve_attrlen) < 0)
1441 return nfserr_bad_xdr;
1442 p = xdr_inline_decode(argp->xdr, verify->ve_attrlen);
1443 if (!p)
1444 return nfserr_bad_xdr;
1445 verify->ve_attrval = svcxdr_savemem(argp, p, verify->ve_attrlen);
1446 if (!verify->ve_attrval)
1447 return nfserr_jukebox;
1448
1449 return nfs_ok;
1450 }
1451
1452 static __be32
nfsd4_decode_write(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1453 nfsd4_decode_write(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
1454 {
1455 struct nfsd4_write *write = &u->write;
1456 __be32 status;
1457
1458 status = nfsd4_decode_stateid4(argp, &write->wr_stateid);
1459 if (status)
1460 return status;
1461 if (xdr_stream_decode_u64(argp->xdr, &write->wr_offset) < 0)
1462 return nfserr_bad_xdr;
1463 if (xdr_stream_decode_u32(argp->xdr, &write->wr_stable_how) < 0)
1464 return nfserr_bad_xdr;
1465 if (write->wr_stable_how > NFS_FILE_SYNC)
1466 return nfserr_bad_xdr;
1467 if (xdr_stream_decode_u32(argp->xdr, &write->wr_buflen) < 0)
1468 return nfserr_bad_xdr;
1469 if (!xdr_stream_subsegment(argp->xdr, &write->wr_payload, write->wr_buflen))
1470 return nfserr_bad_xdr;
1471
1472 write->wr_bytes_written = 0;
1473 write->wr_how_written = 0;
1474 memset(&write->wr_verifier, 0, sizeof(write->wr_verifier));
1475 return nfs_ok;
1476 }
1477
1478 static __be32
nfsd4_decode_release_lockowner(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1479 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp,
1480 union nfsd4_op_u *u)
1481 {
1482 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
1483 __be32 status;
1484
1485 if (argp->minorversion >= 1)
1486 return nfserr_notsupp;
1487
1488 status = nfsd4_decode_state_owner4(argp, &rlockowner->rl_clientid,
1489 &rlockowner->rl_owner);
1490 if (status)
1491 return status;
1492
1493 if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1494 return nfserr_inval;
1495
1496 return nfs_ok;
1497 }
1498
nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1499 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp,
1500 union nfsd4_op_u *u)
1501 {
1502 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
1503 memset(bc, 0, sizeof(*bc));
1504 if (xdr_stream_decode_u32(argp->xdr, &bc->bc_cb_program) < 0)
1505 return nfserr_bad_xdr;
1506 return nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
1507 }
1508
nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1509 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp,
1510 union nfsd4_op_u *u)
1511 {
1512 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
1513 u32 use_conn_in_rdma_mode;
1514 __be32 status;
1515
1516 memset(bcts, 0, sizeof(*bcts));
1517 status = nfsd4_decode_sessionid4(argp, &bcts->sessionid);
1518 if (status)
1519 return status;
1520 if (xdr_stream_decode_u32(argp->xdr, &bcts->dir) < 0)
1521 return nfserr_bad_xdr;
1522 if (xdr_stream_decode_u32(argp->xdr, &use_conn_in_rdma_mode) < 0)
1523 return nfserr_bad_xdr;
1524
1525 return nfs_ok;
1526 }
1527
1528 static __be32
nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs * argp,struct nfsd4_exchange_id * exid)1529 nfsd4_decode_state_protect_ops(struct nfsd4_compoundargs *argp,
1530 struct nfsd4_exchange_id *exid)
1531 {
1532 __be32 status;
1533
1534 status = nfsd4_decode_bitmap4(argp, exid->spo_must_enforce,
1535 ARRAY_SIZE(exid->spo_must_enforce));
1536 if (status)
1537 return nfserr_bad_xdr;
1538 status = nfsd4_decode_bitmap4(argp, exid->spo_must_allow,
1539 ARRAY_SIZE(exid->spo_must_allow));
1540 if (status)
1541 return nfserr_bad_xdr;
1542
1543 return nfs_ok;
1544 }
1545
1546 /*
1547 * This implementation currently does not support SP4_SSV.
1548 * This decoder simply skips over these arguments.
1549 */
1550 static noinline __be32
nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs * argp,struct nfsd4_exchange_id * exid)1551 nfsd4_decode_ssv_sp_parms(struct nfsd4_compoundargs *argp,
1552 struct nfsd4_exchange_id *exid)
1553 {
1554 u32 count, window, num_gss_handles;
1555 __be32 status;
1556
1557 /* ssp_ops */
1558 status = nfsd4_decode_state_protect_ops(argp, exid);
1559 if (status)
1560 return status;
1561
1562 /* ssp_hash_algs<> */
1563 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1564 return nfserr_bad_xdr;
1565 while (count--) {
1566 status = nfsd4_decode_ignored_string(argp, 0);
1567 if (status)
1568 return status;
1569 }
1570
1571 /* ssp_encr_algs<> */
1572 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1573 return nfserr_bad_xdr;
1574 while (count--) {
1575 status = nfsd4_decode_ignored_string(argp, 0);
1576 if (status)
1577 return status;
1578 }
1579
1580 if (xdr_stream_decode_u32(argp->xdr, &window) < 0)
1581 return nfserr_bad_xdr;
1582 if (xdr_stream_decode_u32(argp->xdr, &num_gss_handles) < 0)
1583 return nfserr_bad_xdr;
1584
1585 return nfs_ok;
1586 }
1587
1588 static __be32
nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs * argp,struct nfsd4_exchange_id * exid)1589 nfsd4_decode_state_protect4_a(struct nfsd4_compoundargs *argp,
1590 struct nfsd4_exchange_id *exid)
1591 {
1592 __be32 status;
1593
1594 if (xdr_stream_decode_u32(argp->xdr, &exid->spa_how) < 0)
1595 return nfserr_bad_xdr;
1596 switch (exid->spa_how) {
1597 case SP4_NONE:
1598 break;
1599 case SP4_MACH_CRED:
1600 status = nfsd4_decode_state_protect_ops(argp, exid);
1601 if (status)
1602 return status;
1603 break;
1604 case SP4_SSV:
1605 status = nfsd4_decode_ssv_sp_parms(argp, exid);
1606 if (status)
1607 return status;
1608 break;
1609 default:
1610 return nfserr_bad_xdr;
1611 }
1612
1613 return nfs_ok;
1614 }
1615
1616 static __be32
nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs * argp,struct nfsd4_exchange_id * exid)1617 nfsd4_decode_nfs_impl_id4(struct nfsd4_compoundargs *argp,
1618 struct nfsd4_exchange_id *exid)
1619 {
1620 __be32 status;
1621 u32 count;
1622
1623 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
1624 return nfserr_bad_xdr;
1625 switch (count) {
1626 case 0:
1627 break;
1628 case 1:
1629 /* Note that RFC 8881 places no length limit on
1630 * nii_domain, but this implementation permits no
1631 * more than NFS4_OPAQUE_LIMIT bytes */
1632 status = nfsd4_decode_opaque(argp, &exid->nii_domain);
1633 if (status)
1634 return status;
1635 /* Note that RFC 8881 places no length limit on
1636 * nii_name, but this implementation permits no
1637 * more than NFS4_OPAQUE_LIMIT bytes */
1638 status = nfsd4_decode_opaque(argp, &exid->nii_name);
1639 if (status)
1640 return status;
1641 status = nfsd4_decode_nfstime4(argp, &exid->nii_time);
1642 if (status)
1643 return status;
1644 break;
1645 default:
1646 return nfserr_bad_xdr;
1647 }
1648
1649 return nfs_ok;
1650 }
1651
1652 static __be32
nfsd4_decode_exchange_id(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1653 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1654 union nfsd4_op_u *u)
1655 {
1656 struct nfsd4_exchange_id *exid = &u->exchange_id;
1657 __be32 status;
1658
1659 memset(exid, 0, sizeof(*exid));
1660 status = nfsd4_decode_verifier4(argp, &exid->verifier);
1661 if (status)
1662 return status;
1663 status = nfsd4_decode_opaque(argp, &exid->clname);
1664 if (status)
1665 return status;
1666 if (xdr_stream_decode_u32(argp->xdr, &exid->flags) < 0)
1667 return nfserr_bad_xdr;
1668 status = nfsd4_decode_state_protect4_a(argp, exid);
1669 if (status)
1670 return status;
1671 return nfsd4_decode_nfs_impl_id4(argp, exid);
1672 }
1673
1674 static __be32
nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs * argp,struct nfsd4_channel_attrs * ca)1675 nfsd4_decode_channel_attrs4(struct nfsd4_compoundargs *argp,
1676 struct nfsd4_channel_attrs *ca)
1677 {
1678 __be32 *p;
1679
1680 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 7);
1681 if (!p)
1682 return nfserr_bad_xdr;
1683
1684 /* headerpadsz is ignored */
1685 p++;
1686 ca->maxreq_sz = be32_to_cpup(p++);
1687 ca->maxresp_sz = be32_to_cpup(p++);
1688 ca->maxresp_cached = be32_to_cpup(p++);
1689 ca->maxops = be32_to_cpup(p++);
1690 ca->maxreqs = be32_to_cpup(p++);
1691 ca->nr_rdma_attrs = be32_to_cpup(p);
1692 switch (ca->nr_rdma_attrs) {
1693 case 0:
1694 break;
1695 case 1:
1696 if (xdr_stream_decode_u32(argp->xdr, &ca->rdma_attrs) < 0)
1697 return nfserr_bad_xdr;
1698 break;
1699 default:
1700 return nfserr_bad_xdr;
1701 }
1702
1703 return nfs_ok;
1704 }
1705
1706 static __be32
nfsd4_decode_create_session(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1707 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1708 union nfsd4_op_u *u)
1709 {
1710 struct nfsd4_create_session *sess = &u->create_session;
1711 __be32 status;
1712
1713 memset(sess, 0, sizeof(*sess));
1714 status = nfsd4_decode_clientid4(argp, &sess->clientid);
1715 if (status)
1716 return status;
1717 if (xdr_stream_decode_u32(argp->xdr, &sess->seqid) < 0)
1718 return nfserr_bad_xdr;
1719 if (xdr_stream_decode_u32(argp->xdr, &sess->flags) < 0)
1720 return nfserr_bad_xdr;
1721 status = nfsd4_decode_channel_attrs4(argp, &sess->fore_channel);
1722 if (status)
1723 return status;
1724 status = nfsd4_decode_channel_attrs4(argp, &sess->back_channel);
1725 if (status)
1726 return status;
1727 if (xdr_stream_decode_u32(argp->xdr, &sess->callback_prog) < 0)
1728 return nfserr_bad_xdr;
1729 return nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1730 }
1731
1732 static __be32
nfsd4_decode_destroy_session(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1733 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1734 union nfsd4_op_u *u)
1735 {
1736 struct nfsd4_destroy_session *destroy_session = &u->destroy_session;
1737 return nfsd4_decode_sessionid4(argp, &destroy_session->sessionid);
1738 }
1739
1740 static __be32
nfsd4_decode_free_stateid(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1741 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1742 union nfsd4_op_u *u)
1743 {
1744 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
1745 return nfsd4_decode_stateid4(argp, &free_stateid->fr_stateid);
1746 }
1747
1748 static __be32
nfsd4_decode_get_dir_delegation(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1749 nfsd4_decode_get_dir_delegation(struct nfsd4_compoundargs *argp,
1750 union nfsd4_op_u *u)
1751 {
1752 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
1753 __be32 status;
1754
1755 memset(gdd, 0, sizeof(*gdd));
1756
1757 if (xdr_stream_decode_bool(argp->xdr, &gdd->gdda_signal_deleg_avail) < 0)
1758 return nfserr_bad_xdr;
1759 status = nfsd4_decode_bitmap4(argp, gdd->gdda_notification_types,
1760 ARRAY_SIZE(gdd->gdda_notification_types));
1761 if (status)
1762 return status;
1763 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_child_attr_delay);
1764 if (status)
1765 return status;
1766 status = nfsd4_decode_nfstime4(argp, &gdd->gdda_dir_attr_delay);
1767 if (status)
1768 return status;
1769 status = nfsd4_decode_bitmap4(argp, gdd->gdda_child_attributes,
1770 ARRAY_SIZE(gdd->gdda_child_attributes));
1771 if (status)
1772 return status;
1773 return nfsd4_decode_bitmap4(argp, gdd->gdda_dir_attributes,
1774 ARRAY_SIZE(gdd->gdda_dir_attributes));
1775 }
1776
1777 #ifdef CONFIG_NFSD_PNFS
1778 static __be32
nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1779 nfsd4_decode_getdeviceinfo(struct nfsd4_compoundargs *argp,
1780 union nfsd4_op_u *u)
1781 {
1782 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
1783 __be32 status;
1784
1785 memset(gdev, 0, sizeof(*gdev));
1786 status = nfsd4_decode_deviceid4(argp, &gdev->gd_devid);
1787 if (status)
1788 return status;
1789 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_layout_type) < 0)
1790 return nfserr_bad_xdr;
1791 if (xdr_stream_decode_u32(argp->xdr, &gdev->gd_maxcount) < 0)
1792 return nfserr_bad_xdr;
1793 if (xdr_stream_decode_uint32_array(argp->xdr,
1794 &gdev->gd_notify_types, 1) < 0)
1795 return nfserr_bad_xdr;
1796
1797 return nfs_ok;
1798 }
1799
1800 static __be32
nfsd4_decode_layoutcommit(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1801 nfsd4_decode_layoutcommit(struct nfsd4_compoundargs *argp,
1802 union nfsd4_op_u *u)
1803 {
1804 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1805 __be32 *p, status;
1806
1807 memset(lcp, 0, sizeof(*lcp));
1808 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.offset) < 0)
1809 return nfserr_bad_xdr;
1810 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_seg.length) < 0)
1811 return nfserr_bad_xdr;
1812 if (xdr_stream_decode_bool(argp->xdr, &lcp->lc_reclaim) < 0)
1813 return nfserr_bad_xdr;
1814 status = nfsd4_decode_stateid4(argp, &lcp->lc_sid);
1815 if (status)
1816 return status;
1817 if (xdr_stream_decode_u32(argp->xdr, &lcp->lc_newoffset) < 0)
1818 return nfserr_bad_xdr;
1819 if (lcp->lc_newoffset) {
1820 if (xdr_stream_decode_u64(argp->xdr, &lcp->lc_last_wr) < 0)
1821 return nfserr_bad_xdr;
1822 } else
1823 lcp->lc_last_wr = 0;
1824 p = xdr_inline_decode(argp->xdr, XDR_UNIT);
1825 if (!p)
1826 return nfserr_bad_xdr;
1827 if (xdr_item_is_present(p)) {
1828 status = nfsd4_decode_nfstime4(argp, &lcp->lc_mtime);
1829 if (status)
1830 return status;
1831 } else {
1832 lcp->lc_mtime.tv_nsec = UTIME_NOW;
1833 }
1834 return nfsd4_decode_layoutupdate4(argp, lcp);
1835 }
1836
1837 static __be32
nfsd4_decode_layoutget(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1838 nfsd4_decode_layoutget(struct nfsd4_compoundargs *argp,
1839 union nfsd4_op_u *u)
1840 {
1841 struct nfsd4_layoutget *lgp = &u->layoutget;
1842 __be32 status;
1843
1844 memset(lgp, 0, sizeof(*lgp));
1845 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_signal) < 0)
1846 return nfserr_bad_xdr;
1847 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_layout_type) < 0)
1848 return nfserr_bad_xdr;
1849 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_seg.iomode) < 0)
1850 return nfserr_bad_xdr;
1851 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.offset) < 0)
1852 return nfserr_bad_xdr;
1853 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_seg.length) < 0)
1854 return nfserr_bad_xdr;
1855 if (xdr_stream_decode_u64(argp->xdr, &lgp->lg_minlength) < 0)
1856 return nfserr_bad_xdr;
1857 status = nfsd4_decode_stateid4(argp, &lgp->lg_sid);
1858 if (status)
1859 return status;
1860 if (xdr_stream_decode_u32(argp->xdr, &lgp->lg_maxcount) < 0)
1861 return nfserr_bad_xdr;
1862
1863 return nfs_ok;
1864 }
1865
1866 static __be32
nfsd4_decode_layoutreturn(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1867 nfsd4_decode_layoutreturn(struct nfsd4_compoundargs *argp,
1868 union nfsd4_op_u *u)
1869 {
1870 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1871 memset(lrp, 0, sizeof(*lrp));
1872 if (xdr_stream_decode_bool(argp->xdr, &lrp->lr_reclaim) < 0)
1873 return nfserr_bad_xdr;
1874 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_layout_type) < 0)
1875 return nfserr_bad_xdr;
1876 if (xdr_stream_decode_u32(argp->xdr, &lrp->lr_seg.iomode) < 0)
1877 return nfserr_bad_xdr;
1878 return nfsd4_decode_layoutreturn4(argp, lrp);
1879 }
1880 #endif /* CONFIG_NFSD_PNFS */
1881
nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1882 static __be32 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1883 union nfsd4_op_u *u)
1884 {
1885 struct nfsd4_secinfo_no_name *sin = &u->secinfo_no_name;
1886 if (xdr_stream_decode_u32(argp->xdr, &sin->sin_style) < 0)
1887 return nfserr_bad_xdr;
1888
1889 sin->sin_exp = NULL;
1890 return nfs_ok;
1891 }
1892
1893 static __be32
nfsd4_decode_sequence(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1894 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1895 union nfsd4_op_u *u)
1896 {
1897 struct nfsd4_sequence *seq = &u->sequence;
1898 __be32 *p, status;
1899
1900 status = nfsd4_decode_sessionid4(argp, &seq->sessionid);
1901 if (status)
1902 return status;
1903 p = xdr_inline_decode(argp->xdr, XDR_UNIT * 4);
1904 if (!p)
1905 return nfserr_bad_xdr;
1906 seq->seqid = be32_to_cpup(p++);
1907 seq->slotid = be32_to_cpup(p++);
1908 /* sa_highest_slotid counts from 0 but maxslots counts from 1 ... */
1909 seq->maxslots = be32_to_cpup(p++) + 1;
1910 seq->cachethis = be32_to_cpup(p);
1911
1912 seq->status_flags = 0;
1913 return nfs_ok;
1914 }
1915
1916 static __be32
nfsd4_decode_test_stateid(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1917 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp,
1918 union nfsd4_op_u *u)
1919 {
1920 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
1921 struct nfsd4_test_stateid_id *stateid;
1922 __be32 status;
1923 u32 i;
1924
1925 memset(test_stateid, 0, sizeof(*test_stateid));
1926 if (xdr_stream_decode_u32(argp->xdr, &test_stateid->ts_num_ids) < 0)
1927 return nfserr_bad_xdr;
1928
1929 INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1930 for (i = 0; i < test_stateid->ts_num_ids; i++) {
1931 stateid = svcxdr_tmpalloc(argp, sizeof(*stateid));
1932 if (!stateid)
1933 return nfserr_jukebox;
1934 INIT_LIST_HEAD(&stateid->ts_id_list);
1935 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1936 status = nfsd4_decode_stateid4(argp, &stateid->ts_id_stateid);
1937 if (status)
1938 return status;
1939 }
1940
1941 return nfs_ok;
1942 }
1943
nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1944 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp,
1945 union nfsd4_op_u *u)
1946 {
1947 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
1948 return nfsd4_decode_clientid4(argp, &dc->clientid);
1949 }
1950
nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1951 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp,
1952 union nfsd4_op_u *u)
1953 {
1954 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
1955 if (xdr_stream_decode_bool(argp->xdr, &rc->rca_one_fs) < 0)
1956 return nfserr_bad_xdr;
1957 return nfs_ok;
1958 }
1959
1960 static __be32
nfsd4_decode_fallocate(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)1961 nfsd4_decode_fallocate(struct nfsd4_compoundargs *argp,
1962 union nfsd4_op_u *u)
1963 {
1964 struct nfsd4_fallocate *fallocate = &u->allocate;
1965 __be32 status;
1966
1967 status = nfsd4_decode_stateid4(argp, &fallocate->falloc_stateid);
1968 if (status)
1969 return status;
1970 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_offset) < 0)
1971 return nfserr_bad_xdr;
1972 if (xdr_stream_decode_u64(argp->xdr, &fallocate->falloc_length) < 0)
1973 return nfserr_bad_xdr;
1974
1975 return nfs_ok;
1976 }
1977
nfsd4_decode_nl4_server(struct nfsd4_compoundargs * argp,struct nl4_server * ns)1978 static __be32 nfsd4_decode_nl4_server(struct nfsd4_compoundargs *argp,
1979 struct nl4_server *ns)
1980 {
1981 struct nfs42_netaddr *naddr;
1982 __be32 *p;
1983
1984 if (xdr_stream_decode_u32(argp->xdr, &ns->nl4_type) < 0)
1985 return nfserr_bad_xdr;
1986
1987 /* currently support for 1 inter-server source server */
1988 switch (ns->nl4_type) {
1989 case NL4_NETADDR:
1990 naddr = &ns->u.nl4_addr;
1991
1992 if (xdr_stream_decode_u32(argp->xdr, &naddr->netid_len) < 0)
1993 return nfserr_bad_xdr;
1994 if (naddr->netid_len > RPCBIND_MAXNETIDLEN)
1995 return nfserr_bad_xdr;
1996
1997 p = xdr_inline_decode(argp->xdr, naddr->netid_len);
1998 if (!p)
1999 return nfserr_bad_xdr;
2000 memcpy(naddr->netid, p, naddr->netid_len);
2001
2002 if (xdr_stream_decode_u32(argp->xdr, &naddr->addr_len) < 0)
2003 return nfserr_bad_xdr;
2004 if (naddr->addr_len > RPCBIND_MAXUADDRLEN)
2005 return nfserr_bad_xdr;
2006
2007 p = xdr_inline_decode(argp->xdr, naddr->addr_len);
2008 if (!p)
2009 return nfserr_bad_xdr;
2010 memcpy(naddr->addr, p, naddr->addr_len);
2011 break;
2012 default:
2013 return nfserr_bad_xdr;
2014 }
2015
2016 return nfs_ok;
2017 }
2018
2019 static __be32
nfsd4_decode_copy(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2020 nfsd4_decode_copy(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2021 {
2022 struct nfsd4_copy *copy = &u->copy;
2023 u32 consecutive, i, count, sync;
2024 struct nl4_server *ns_dummy;
2025 __be32 status;
2026
2027 memset(copy, 0, sizeof(*copy));
2028 status = nfsd4_decode_stateid4(argp, ©->cp_src_stateid);
2029 if (status)
2030 return status;
2031 status = nfsd4_decode_stateid4(argp, ©->cp_dst_stateid);
2032 if (status)
2033 return status;
2034 if (xdr_stream_decode_u64(argp->xdr, ©->cp_src_pos) < 0)
2035 return nfserr_bad_xdr;
2036 if (xdr_stream_decode_u64(argp->xdr, ©->cp_dst_pos) < 0)
2037 return nfserr_bad_xdr;
2038 if (xdr_stream_decode_u64(argp->xdr, ©->cp_count) < 0)
2039 return nfserr_bad_xdr;
2040 /* ca_consecutive: we always do consecutive copies */
2041 if (xdr_stream_decode_u32(argp->xdr, &consecutive) < 0)
2042 return nfserr_bad_xdr;
2043 if (xdr_stream_decode_bool(argp->xdr, &sync) < 0)
2044 return nfserr_bad_xdr;
2045 nfsd4_copy_set_sync(copy, sync);
2046
2047 if (xdr_stream_decode_u32(argp->xdr, &count) < 0)
2048 return nfserr_bad_xdr;
2049 copy->cp_src = svcxdr_tmpalloc(argp, sizeof(*copy->cp_src));
2050 if (copy->cp_src == NULL)
2051 return nfserr_jukebox;
2052 if (count == 0) { /* intra-server copy */
2053 __set_bit(NFSD4_COPY_F_INTRA, ©->cp_flags);
2054 return nfs_ok;
2055 }
2056
2057 /* decode all the supplied server addresses but use only the first */
2058 status = nfsd4_decode_nl4_server(argp, copy->cp_src);
2059 if (status)
2060 return status;
2061
2062 ns_dummy = kmalloc(sizeof(struct nl4_server), GFP_KERNEL);
2063 if (ns_dummy == NULL)
2064 return nfserr_jukebox;
2065 for (i = 0; i < count - 1; i++) {
2066 status = nfsd4_decode_nl4_server(argp, ns_dummy);
2067 if (status) {
2068 kfree(ns_dummy);
2069 return status;
2070 }
2071 }
2072 kfree(ns_dummy);
2073
2074 return nfs_ok;
2075 }
2076
2077 static __be32
nfsd4_decode_copy_notify(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2078 nfsd4_decode_copy_notify(struct nfsd4_compoundargs *argp,
2079 union nfsd4_op_u *u)
2080 {
2081 struct nfsd4_copy_notify *cn = &u->copy_notify;
2082 __be32 status;
2083
2084 memset(cn, 0, sizeof(*cn));
2085 cn->cpn_src = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_src));
2086 if (cn->cpn_src == NULL)
2087 return nfserr_jukebox;
2088 cn->cpn_dst = svcxdr_tmpalloc(argp, sizeof(*cn->cpn_dst));
2089 if (cn->cpn_dst == NULL)
2090 return nfserr_jukebox;
2091
2092 status = nfsd4_decode_stateid4(argp, &cn->cpn_src_stateid);
2093 if (status)
2094 return status;
2095 return nfsd4_decode_nl4_server(argp, cn->cpn_dst);
2096 }
2097
2098 static __be32
nfsd4_decode_offload_status(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2099 nfsd4_decode_offload_status(struct nfsd4_compoundargs *argp,
2100 union nfsd4_op_u *u)
2101 {
2102 struct nfsd4_offload_status *os = &u->offload_status;
2103 os->count = 0;
2104 os->status = 0;
2105 return nfsd4_decode_stateid4(argp, &os->stateid);
2106 }
2107
2108 static __be32
nfsd4_decode_seek(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2109 nfsd4_decode_seek(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2110 {
2111 struct nfsd4_seek *seek = &u->seek;
2112 __be32 status;
2113
2114 status = nfsd4_decode_stateid4(argp, &seek->seek_stateid);
2115 if (status)
2116 return status;
2117 if (xdr_stream_decode_u64(argp->xdr, &seek->seek_offset) < 0)
2118 return nfserr_bad_xdr;
2119 if (xdr_stream_decode_u32(argp->xdr, &seek->seek_whence) < 0)
2120 return nfserr_bad_xdr;
2121
2122 seek->seek_eof = 0;
2123 seek->seek_pos = 0;
2124 return nfs_ok;
2125 }
2126
2127 static __be32
nfsd4_decode_clone(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2128 nfsd4_decode_clone(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u)
2129 {
2130 struct nfsd4_clone *clone = &u->clone;
2131 __be32 status;
2132
2133 status = nfsd4_decode_stateid4(argp, &clone->cl_src_stateid);
2134 if (status)
2135 return status;
2136 status = nfsd4_decode_stateid4(argp, &clone->cl_dst_stateid);
2137 if (status)
2138 return status;
2139 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_src_pos) < 0)
2140 return nfserr_bad_xdr;
2141 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_dst_pos) < 0)
2142 return nfserr_bad_xdr;
2143 if (xdr_stream_decode_u64(argp->xdr, &clone->cl_count) < 0)
2144 return nfserr_bad_xdr;
2145
2146 return nfs_ok;
2147 }
2148
2149 /*
2150 * XDR data that is more than PAGE_SIZE in size is normally part of a
2151 * read or write. However, the size of extended attributes is limited
2152 * by the maximum request size, and then further limited by the underlying
2153 * filesystem limits. This can exceed PAGE_SIZE (currently, XATTR_SIZE_MAX
2154 * is 64k). Since there is no kvec- or page-based interface to xattrs,
2155 * and we're not dealing with contiguous pages, we need to do some copying.
2156 */
2157
2158 /*
2159 * Decode data into buffer.
2160 */
2161 static __be32
nfsd4_vbuf_from_vector(struct nfsd4_compoundargs * argp,struct xdr_buf * xdr,char ** bufp,size_t buflen)2162 nfsd4_vbuf_from_vector(struct nfsd4_compoundargs *argp, struct xdr_buf *xdr,
2163 char **bufp, size_t buflen)
2164 {
2165 struct page **pages = xdr->pages;
2166 struct kvec *head = xdr->head;
2167 char *tmp, *dp;
2168 u32 len;
2169
2170 if (buflen <= head->iov_len) {
2171 /*
2172 * We're in luck, the head has enough space. Just return
2173 * the head, no need for copying.
2174 */
2175 *bufp = head->iov_base;
2176 return 0;
2177 }
2178
2179 tmp = svcxdr_tmpalloc(argp, buflen);
2180 if (tmp == NULL)
2181 return nfserr_jukebox;
2182
2183 dp = tmp;
2184 memcpy(dp, head->iov_base, head->iov_len);
2185 buflen -= head->iov_len;
2186 dp += head->iov_len;
2187
2188 while (buflen > 0) {
2189 len = min_t(u32, buflen, PAGE_SIZE);
2190 memcpy(dp, page_address(*pages), len);
2191
2192 buflen -= len;
2193 dp += len;
2194 pages++;
2195 }
2196
2197 *bufp = tmp;
2198 return 0;
2199 }
2200
2201 /*
2202 * Get a user extended attribute name from the XDR buffer.
2203 * It will not have the "user." prefix, so prepend it.
2204 * Lastly, check for nul characters in the name.
2205 */
2206 static __be32
nfsd4_decode_xattr_name(struct nfsd4_compoundargs * argp,char ** namep)2207 nfsd4_decode_xattr_name(struct nfsd4_compoundargs *argp, char **namep)
2208 {
2209 char *name, *sp, *dp;
2210 u32 namelen, cnt;
2211 __be32 *p;
2212
2213 if (xdr_stream_decode_u32(argp->xdr, &namelen) < 0)
2214 return nfserr_bad_xdr;
2215 if (namelen > (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN))
2216 return nfserr_nametoolong;
2217 if (namelen == 0)
2218 return nfserr_bad_xdr;
2219 p = xdr_inline_decode(argp->xdr, namelen);
2220 if (!p)
2221 return nfserr_bad_xdr;
2222 name = svcxdr_tmpalloc(argp, namelen + XATTR_USER_PREFIX_LEN + 1);
2223 if (!name)
2224 return nfserr_jukebox;
2225 memcpy(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2226
2227 /*
2228 * Copy the extended attribute name over while checking for 0
2229 * characters.
2230 */
2231 sp = (char *)p;
2232 dp = name + XATTR_USER_PREFIX_LEN;
2233 cnt = namelen;
2234
2235 while (cnt-- > 0) {
2236 if (*sp == '\0')
2237 return nfserr_bad_xdr;
2238 *dp++ = *sp++;
2239 }
2240 *dp = '\0';
2241
2242 *namep = name;
2243
2244 return nfs_ok;
2245 }
2246
2247 /*
2248 * A GETXATTR op request comes without a length specifier. We just set the
2249 * maximum length for the reply based on XATTR_SIZE_MAX and the maximum
2250 * channel reply size. nfsd_getxattr will probe the length of the xattr,
2251 * check it against getxa_len, and allocate + return the value.
2252 */
2253 static __be32
nfsd4_decode_getxattr(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2254 nfsd4_decode_getxattr(struct nfsd4_compoundargs *argp,
2255 union nfsd4_op_u *u)
2256 {
2257 struct nfsd4_getxattr *getxattr = &u->getxattr;
2258 __be32 status;
2259 u32 maxcount;
2260
2261 memset(getxattr, 0, sizeof(*getxattr));
2262 status = nfsd4_decode_xattr_name(argp, &getxattr->getxa_name);
2263 if (status)
2264 return status;
2265
2266 maxcount = svc_max_payload(argp->rqstp);
2267 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2268
2269 getxattr->getxa_len = maxcount;
2270 return nfs_ok;
2271 }
2272
2273 static __be32
nfsd4_decode_setxattr(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2274 nfsd4_decode_setxattr(struct nfsd4_compoundargs *argp,
2275 union nfsd4_op_u *u)
2276 {
2277 struct nfsd4_setxattr *setxattr = &u->setxattr;
2278 u32 flags, maxcount, size;
2279 __be32 status;
2280
2281 memset(setxattr, 0, sizeof(*setxattr));
2282
2283 if (xdr_stream_decode_u32(argp->xdr, &flags) < 0)
2284 return nfserr_bad_xdr;
2285
2286 if (flags > SETXATTR4_REPLACE)
2287 return nfserr_inval;
2288 setxattr->setxa_flags = flags;
2289
2290 status = nfsd4_decode_xattr_name(argp, &setxattr->setxa_name);
2291 if (status)
2292 return status;
2293
2294 maxcount = svc_max_payload(argp->rqstp);
2295 maxcount = min_t(u32, XATTR_SIZE_MAX, maxcount);
2296
2297 if (xdr_stream_decode_u32(argp->xdr, &size) < 0)
2298 return nfserr_bad_xdr;
2299 if (size > maxcount)
2300 return nfserr_xattr2big;
2301
2302 setxattr->setxa_len = size;
2303 if (size > 0) {
2304 struct xdr_buf payload;
2305
2306 if (!xdr_stream_subsegment(argp->xdr, &payload, size))
2307 return nfserr_bad_xdr;
2308 status = nfsd4_vbuf_from_vector(argp, &payload,
2309 &setxattr->setxa_buf, size);
2310 }
2311
2312 return nfs_ok;
2313 }
2314
2315 static __be32
nfsd4_decode_listxattrs(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2316 nfsd4_decode_listxattrs(struct nfsd4_compoundargs *argp,
2317 union nfsd4_op_u *u)
2318 {
2319 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
2320 u32 maxcount;
2321
2322 memset(listxattrs, 0, sizeof(*listxattrs));
2323
2324 if (xdr_stream_decode_u64(argp->xdr, &listxattrs->lsxa_cookie) < 0)
2325 return nfserr_bad_xdr;
2326
2327 /*
2328 * If the cookie is too large to have even one user.x attribute
2329 * plus trailing '\0' left in a maximum size buffer, it's invalid.
2330 */
2331 if (listxattrs->lsxa_cookie >=
2332 (XATTR_LIST_MAX / (XATTR_USER_PREFIX_LEN + 2)))
2333 return nfserr_badcookie;
2334
2335 if (xdr_stream_decode_u32(argp->xdr, &maxcount) < 0)
2336 return nfserr_bad_xdr;
2337 if (maxcount < 8)
2338 /* Always need at least 2 words (length and one character) */
2339 return nfserr_inval;
2340
2341 maxcount = min(maxcount, svc_max_payload(argp->rqstp));
2342 listxattrs->lsxa_maxcount = maxcount;
2343
2344 return nfs_ok;
2345 }
2346
2347 static __be32
nfsd4_decode_removexattr(struct nfsd4_compoundargs * argp,union nfsd4_op_u * u)2348 nfsd4_decode_removexattr(struct nfsd4_compoundargs *argp,
2349 union nfsd4_op_u *u)
2350 {
2351 struct nfsd4_removexattr *removexattr = &u->removexattr;
2352 memset(removexattr, 0, sizeof(*removexattr));
2353 return nfsd4_decode_xattr_name(argp, &removexattr->rmxa_name);
2354 }
2355
2356 static __be32
nfsd4_decode_noop(struct nfsd4_compoundargs * argp,union nfsd4_op_u * p)2357 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2358 {
2359 return nfs_ok;
2360 }
2361
2362 static __be32
nfsd4_decode_notsupp(struct nfsd4_compoundargs * argp,union nfsd4_op_u * p)2363 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, union nfsd4_op_u *p)
2364 {
2365 return nfserr_notsupp;
2366 }
2367
2368 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, union nfsd4_op_u *u);
2369
2370 static const nfsd4_dec nfsd4_dec_ops[] = {
2371 [OP_ACCESS] = nfsd4_decode_access,
2372 [OP_CLOSE] = nfsd4_decode_close,
2373 [OP_COMMIT] = nfsd4_decode_commit,
2374 [OP_CREATE] = nfsd4_decode_create,
2375 [OP_DELEGPURGE] = nfsd4_decode_notsupp,
2376 [OP_DELEGRETURN] = nfsd4_decode_delegreturn,
2377 [OP_GETATTR] = nfsd4_decode_getattr,
2378 [OP_GETFH] = nfsd4_decode_noop,
2379 [OP_LINK] = nfsd4_decode_link,
2380 [OP_LOCK] = nfsd4_decode_lock,
2381 [OP_LOCKT] = nfsd4_decode_lockt,
2382 [OP_LOCKU] = nfsd4_decode_locku,
2383 [OP_LOOKUP] = nfsd4_decode_lookup,
2384 [OP_LOOKUPP] = nfsd4_decode_noop,
2385 [OP_NVERIFY] = nfsd4_decode_verify,
2386 [OP_OPEN] = nfsd4_decode_open,
2387 [OP_OPENATTR] = nfsd4_decode_notsupp,
2388 [OP_OPEN_CONFIRM] = nfsd4_decode_open_confirm,
2389 [OP_OPEN_DOWNGRADE] = nfsd4_decode_open_downgrade,
2390 [OP_PUTFH] = nfsd4_decode_putfh,
2391 [OP_PUTPUBFH] = nfsd4_decode_noop,
2392 [OP_PUTROOTFH] = nfsd4_decode_noop,
2393 [OP_READ] = nfsd4_decode_read,
2394 [OP_READDIR] = nfsd4_decode_readdir,
2395 [OP_READLINK] = nfsd4_decode_noop,
2396 [OP_REMOVE] = nfsd4_decode_remove,
2397 [OP_RENAME] = nfsd4_decode_rename,
2398 [OP_RENEW] = nfsd4_decode_renew,
2399 [OP_RESTOREFH] = nfsd4_decode_noop,
2400 [OP_SAVEFH] = nfsd4_decode_noop,
2401 [OP_SECINFO] = nfsd4_decode_secinfo,
2402 [OP_SETATTR] = nfsd4_decode_setattr,
2403 [OP_SETCLIENTID] = nfsd4_decode_setclientid,
2404 [OP_SETCLIENTID_CONFIRM] = nfsd4_decode_setclientid_confirm,
2405 [OP_VERIFY] = nfsd4_decode_verify,
2406 [OP_WRITE] = nfsd4_decode_write,
2407 [OP_RELEASE_LOCKOWNER] = nfsd4_decode_release_lockowner,
2408
2409 /* new operations for NFSv4.1 */
2410 [OP_BACKCHANNEL_CTL] = nfsd4_decode_backchannel_ctl,
2411 [OP_BIND_CONN_TO_SESSION] = nfsd4_decode_bind_conn_to_session,
2412 [OP_EXCHANGE_ID] = nfsd4_decode_exchange_id,
2413 [OP_CREATE_SESSION] = nfsd4_decode_create_session,
2414 [OP_DESTROY_SESSION] = nfsd4_decode_destroy_session,
2415 [OP_FREE_STATEID] = nfsd4_decode_free_stateid,
2416 [OP_GET_DIR_DELEGATION] = nfsd4_decode_get_dir_delegation,
2417 #ifdef CONFIG_NFSD_PNFS
2418 [OP_GETDEVICEINFO] = nfsd4_decode_getdeviceinfo,
2419 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2420 [OP_LAYOUTCOMMIT] = nfsd4_decode_layoutcommit,
2421 [OP_LAYOUTGET] = nfsd4_decode_layoutget,
2422 [OP_LAYOUTRETURN] = nfsd4_decode_layoutreturn,
2423 #else
2424 [OP_GETDEVICEINFO] = nfsd4_decode_notsupp,
2425 [OP_GETDEVICELIST] = nfsd4_decode_notsupp,
2426 [OP_LAYOUTCOMMIT] = nfsd4_decode_notsupp,
2427 [OP_LAYOUTGET] = nfsd4_decode_notsupp,
2428 [OP_LAYOUTRETURN] = nfsd4_decode_notsupp,
2429 #endif
2430 [OP_SECINFO_NO_NAME] = nfsd4_decode_secinfo_no_name,
2431 [OP_SEQUENCE] = nfsd4_decode_sequence,
2432 [OP_SET_SSV] = nfsd4_decode_notsupp,
2433 [OP_TEST_STATEID] = nfsd4_decode_test_stateid,
2434 [OP_WANT_DELEGATION] = nfsd4_decode_notsupp,
2435 [OP_DESTROY_CLIENTID] = nfsd4_decode_destroy_clientid,
2436 [OP_RECLAIM_COMPLETE] = nfsd4_decode_reclaim_complete,
2437
2438 /* new operations for NFSv4.2 */
2439 [OP_ALLOCATE] = nfsd4_decode_fallocate,
2440 [OP_COPY] = nfsd4_decode_copy,
2441 [OP_COPY_NOTIFY] = nfsd4_decode_copy_notify,
2442 [OP_DEALLOCATE] = nfsd4_decode_fallocate,
2443 [OP_IO_ADVISE] = nfsd4_decode_notsupp,
2444 [OP_LAYOUTERROR] = nfsd4_decode_notsupp,
2445 [OP_LAYOUTSTATS] = nfsd4_decode_notsupp,
2446 [OP_OFFLOAD_CANCEL] = nfsd4_decode_offload_status,
2447 [OP_OFFLOAD_STATUS] = nfsd4_decode_offload_status,
2448 [OP_READ_PLUS] = nfsd4_decode_read,
2449 [OP_SEEK] = nfsd4_decode_seek,
2450 [OP_WRITE_SAME] = nfsd4_decode_notsupp,
2451 [OP_CLONE] = nfsd4_decode_clone,
2452 /* RFC 8276 extended atributes operations */
2453 [OP_GETXATTR] = nfsd4_decode_getxattr,
2454 [OP_SETXATTR] = nfsd4_decode_setxattr,
2455 [OP_LISTXATTRS] = nfsd4_decode_listxattrs,
2456 [OP_REMOVEXATTR] = nfsd4_decode_removexattr,
2457 };
2458
2459 static inline bool
nfsd4_opnum_in_range(struct nfsd4_compoundargs * argp,struct nfsd4_op * op)2460 nfsd4_opnum_in_range(struct nfsd4_compoundargs *argp, struct nfsd4_op *op)
2461 {
2462 if (op->opnum < FIRST_NFS4_OP)
2463 return false;
2464 else if (argp->minorversion == 0 && op->opnum > LAST_NFS40_OP)
2465 return false;
2466 else if (argp->minorversion == 1 && op->opnum > LAST_NFS41_OP)
2467 return false;
2468 else if (argp->minorversion == 2 && op->opnum > LAST_NFS42_OP)
2469 return false;
2470 return true;
2471 }
2472
2473 static bool
nfsd4_decode_compound(struct nfsd4_compoundargs * argp)2474 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
2475 {
2476 struct nfsd4_op *op;
2477 bool cachethis = false;
2478 int auth_slack= argp->rqstp->rq_auth_slack;
2479 int max_reply = auth_slack + 8; /* opcnt, status */
2480 int readcount = 0;
2481 int readbytes = 0;
2482 __be32 *p;
2483 int i;
2484
2485 if (xdr_stream_decode_u32(argp->xdr, &argp->taglen) < 0)
2486 return false;
2487 max_reply += XDR_UNIT;
2488 argp->tag = NULL;
2489 if (unlikely(argp->taglen)) {
2490 if (argp->taglen > NFSD4_MAX_TAGLEN)
2491 return false;
2492 p = xdr_inline_decode(argp->xdr, argp->taglen);
2493 if (!p)
2494 return false;
2495 argp->tag = svcxdr_savemem(argp, p, argp->taglen);
2496 if (!argp->tag)
2497 return false;
2498 max_reply += xdr_align_size(argp->taglen);
2499 }
2500
2501 if (xdr_stream_decode_u32(argp->xdr, &argp->minorversion) < 0)
2502 return false;
2503 if (xdr_stream_decode_u32(argp->xdr, &argp->client_opcnt) < 0)
2504 return false;
2505 argp->opcnt = min_t(u32, argp->client_opcnt,
2506 NFSD_MAX_OPS_PER_COMPOUND);
2507
2508 if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
2509 argp->ops = vcalloc(argp->opcnt, sizeof(*argp->ops));
2510 if (!argp->ops) {
2511 argp->ops = argp->iops;
2512 return false;
2513 }
2514 }
2515
2516 if (argp->minorversion > NFSD_SUPPORTED_MINOR_VERSION)
2517 argp->opcnt = 0;
2518
2519 for (i = 0; i < argp->opcnt; i++) {
2520 op = &argp->ops[i];
2521 op->replay = NULL;
2522 op->opdesc = NULL;
2523
2524 if (xdr_stream_decode_u32(argp->xdr, &op->opnum) < 0)
2525 return false;
2526 if (nfsd4_opnum_in_range(argp, op)) {
2527 op->opdesc = OPDESC(op);
2528 op->status = nfsd4_dec_ops[op->opnum](argp, &op->u);
2529 if (op->status != nfs_ok)
2530 trace_nfsd_compound_decode_err(argp->rqstp,
2531 argp->opcnt, i,
2532 op->opnum,
2533 op->status);
2534 } else {
2535 op->opnum = OP_ILLEGAL;
2536 op->status = nfserr_op_illegal;
2537 }
2538
2539 /*
2540 * We'll try to cache the result in the DRC if any one
2541 * op in the compound wants to be cached:
2542 */
2543 cachethis |= nfsd4_cache_this_op(op);
2544
2545 if (op->opnum == OP_READ || op->opnum == OP_READ_PLUS) {
2546 readcount++;
2547 readbytes += nfsd4_max_reply(argp->rqstp, op);
2548 } else
2549 max_reply += nfsd4_max_reply(argp->rqstp, op);
2550 /*
2551 * OP_LOCK and OP_LOCKT may return a conflicting lock.
2552 * (Special case because it will just skip encoding this
2553 * if it runs out of xdr buffer space, and it is the only
2554 * operation that behaves this way.)
2555 */
2556 if (op->opnum == OP_LOCK || op->opnum == OP_LOCKT)
2557 max_reply += NFS4_OPAQUE_LIMIT;
2558
2559 if (op->status) {
2560 argp->opcnt = i+1;
2561 break;
2562 }
2563 }
2564 /* Sessions make the DRC unnecessary: */
2565 if (argp->minorversion)
2566 cachethis = false;
2567 svc_reserve(argp->rqstp, max_reply + readbytes);
2568 argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
2569
2570 argp->splice_ok = nfsd_read_splice_ok(argp->rqstp);
2571 if (readcount > 1 || max_reply > PAGE_SIZE - auth_slack)
2572 argp->splice_ok = false;
2573
2574 return true;
2575 }
2576
nfsd4_encode_nfs_fh4(struct xdr_stream * xdr,struct knfsd_fh * fh_handle)2577 static __be32 nfsd4_encode_nfs_fh4(struct xdr_stream *xdr,
2578 struct knfsd_fh *fh_handle)
2579 {
2580 return nfsd4_encode_opaque(xdr, fh_handle->fh_raw, fh_handle->fh_size);
2581 }
2582
2583 /* This is a frequently-encoded type; open-coded for speed */
nfsd4_encode_nfstime4(struct xdr_stream * xdr,const struct timespec64 * tv)2584 static __be32 nfsd4_encode_nfstime4(struct xdr_stream *xdr,
2585 const struct timespec64 *tv)
2586 {
2587 __be32 *p;
2588
2589 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2590 if (!p)
2591 return nfserr_resource;
2592 p = xdr_encode_hyper(p, tv->tv_sec);
2593 *p = cpu_to_be32(tv->tv_nsec);
2594 return nfs_ok;
2595 }
2596
nfsd4_encode_specdata4(struct xdr_stream * xdr,unsigned int major,unsigned int minor)2597 static __be32 nfsd4_encode_specdata4(struct xdr_stream *xdr,
2598 unsigned int major, unsigned int minor)
2599 {
2600 __be32 status;
2601
2602 status = nfsd4_encode_uint32_t(xdr, major);
2603 if (status != nfs_ok)
2604 return status;
2605 return nfsd4_encode_uint32_t(xdr, minor);
2606 }
2607
2608 static __be32
nfsd4_encode_change_info4(struct xdr_stream * xdr,const struct nfsd4_change_info * c)2609 nfsd4_encode_change_info4(struct xdr_stream *xdr, const struct nfsd4_change_info *c)
2610 {
2611 __be32 status;
2612
2613 status = nfsd4_encode_bool(xdr, c->atomic);
2614 if (status != nfs_ok)
2615 return status;
2616 status = nfsd4_encode_changeid4(xdr, c->before_change);
2617 if (status != nfs_ok)
2618 return status;
2619 return nfsd4_encode_changeid4(xdr, c->after_change);
2620 }
2621
nfsd4_encode_netaddr4(struct xdr_stream * xdr,const struct nfs42_netaddr * addr)2622 static __be32 nfsd4_encode_netaddr4(struct xdr_stream *xdr,
2623 const struct nfs42_netaddr *addr)
2624 {
2625 __be32 status;
2626
2627 /* na_r_netid */
2628 status = nfsd4_encode_opaque(xdr, addr->netid, addr->netid_len);
2629 if (status != nfs_ok)
2630 return status;
2631 /* na_r_addr */
2632 return nfsd4_encode_opaque(xdr, addr->addr, addr->addr_len);
2633 }
2634
2635 /* Encode as an array of strings the string given with components
2636 * separated @sep, escaped with esc_enter and esc_exit.
2637 */
nfsd4_encode_components_esc(struct xdr_stream * xdr,char sep,char * components,char esc_enter,char esc_exit)2638 static __be32 nfsd4_encode_components_esc(struct xdr_stream *xdr, char sep,
2639 char *components, char esc_enter,
2640 char esc_exit)
2641 {
2642 __be32 *p;
2643 __be32 pathlen;
2644 int pathlen_offset;
2645 int strlen, count=0;
2646 char *str, *end, *next;
2647
2648 dprintk("nfsd4_encode_components(%s)\n", components);
2649
2650 pathlen_offset = xdr->buf->len;
2651 p = xdr_reserve_space(xdr, 4);
2652 if (!p)
2653 return nfserr_resource;
2654 p++; /* We will fill this in with @count later */
2655
2656 end = str = components;
2657 while (*end) {
2658 bool found_esc = false;
2659
2660 /* try to parse as esc_start, ..., esc_end, sep */
2661 if (*str == esc_enter) {
2662 for (; *end && (*end != esc_exit); end++)
2663 /* find esc_exit or end of string */;
2664 next = end + 1;
2665 if (*end && (!*next || *next == sep)) {
2666 str++;
2667 found_esc = true;
2668 }
2669 }
2670
2671 if (!found_esc)
2672 for (; *end && (*end != sep); end++)
2673 /* find sep or end of string */;
2674
2675 strlen = end - str;
2676 if (strlen) {
2677 if (xdr_stream_encode_opaque(xdr, str, strlen) < 0)
2678 return nfserr_resource;
2679 count++;
2680 } else
2681 end++;
2682 if (found_esc)
2683 end = next;
2684
2685 str = end;
2686 }
2687 pathlen = htonl(count);
2688 write_bytes_to_xdr_buf(xdr->buf, pathlen_offset, &pathlen, 4);
2689 return 0;
2690 }
2691
2692 /* Encode as an array of strings the string given with components
2693 * separated @sep.
2694 */
nfsd4_encode_components(struct xdr_stream * xdr,char sep,char * components)2695 static __be32 nfsd4_encode_components(struct xdr_stream *xdr, char sep,
2696 char *components)
2697 {
2698 return nfsd4_encode_components_esc(xdr, sep, components, 0, 0);
2699 }
2700
nfsd4_encode_fs_location4(struct xdr_stream * xdr,struct nfsd4_fs_location * location)2701 static __be32 nfsd4_encode_fs_location4(struct xdr_stream *xdr,
2702 struct nfsd4_fs_location *location)
2703 {
2704 __be32 status;
2705
2706 status = nfsd4_encode_components_esc(xdr, ':', location->hosts,
2707 '[', ']');
2708 if (status)
2709 return status;
2710 status = nfsd4_encode_components(xdr, '/', location->path);
2711 if (status)
2712 return status;
2713 return nfs_ok;
2714 }
2715
nfsd4_encode_pathname4(struct xdr_stream * xdr,const struct path * root,const struct path * path)2716 static __be32 nfsd4_encode_pathname4(struct xdr_stream *xdr,
2717 const struct path *root,
2718 const struct path *path)
2719 {
2720 struct path cur = *path;
2721 struct dentry **components = NULL;
2722 unsigned int ncomponents = 0;
2723 __be32 err = nfserr_jukebox;
2724
2725 dprintk("nfsd4_encode_components(");
2726
2727 path_get(&cur);
2728 /* First walk the path up to the nfsd root, and store the
2729 * dentries/path components in an array.
2730 */
2731 for (;;) {
2732 if (path_equal(&cur, root))
2733 break;
2734 if (cur.dentry == cur.mnt->mnt_root) {
2735 if (follow_up(&cur))
2736 continue;
2737 goto out_free;
2738 }
2739 if ((ncomponents & 15) == 0) {
2740 struct dentry **new;
2741 new = krealloc(components,
2742 sizeof(*new) * (ncomponents + 16),
2743 GFP_KERNEL);
2744 if (!new)
2745 goto out_free;
2746 components = new;
2747 }
2748 components[ncomponents++] = cur.dentry;
2749 cur.dentry = dget_parent(cur.dentry);
2750 }
2751
2752 err = nfserr_resource;
2753 if (xdr_stream_encode_u32(xdr, ncomponents) != XDR_UNIT)
2754 goto out_free;
2755 while (ncomponents) {
2756 struct dentry *dentry = components[ncomponents - 1];
2757
2758 spin_lock(&dentry->d_lock);
2759 if (xdr_stream_encode_opaque(xdr, dentry->d_name.name,
2760 dentry->d_name.len) < 0) {
2761 spin_unlock(&dentry->d_lock);
2762 goto out_free;
2763 }
2764 dprintk("/%pd", dentry);
2765 spin_unlock(&dentry->d_lock);
2766 dput(dentry);
2767 ncomponents--;
2768 }
2769
2770 err = 0;
2771 out_free:
2772 dprintk(")\n");
2773 while (ncomponents)
2774 dput(components[--ncomponents]);
2775 kfree(components);
2776 path_put(&cur);
2777 return err;
2778 }
2779
nfsd4_encode_fs_locations4(struct xdr_stream * xdr,struct svc_rqst * rqstp,struct svc_export * exp)2780 static __be32 nfsd4_encode_fs_locations4(struct xdr_stream *xdr,
2781 struct svc_rqst *rqstp,
2782 struct svc_export *exp)
2783 {
2784 struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
2785 struct svc_export *exp_ps;
2786 unsigned int i;
2787 __be32 status;
2788
2789 /* fs_root */
2790 exp_ps = rqst_find_fsidzero_export(rqstp);
2791 if (IS_ERR(exp_ps))
2792 return nfserrno(PTR_ERR(exp_ps));
2793 status = nfsd4_encode_pathname4(xdr, &exp_ps->ex_path, &exp->ex_path);
2794 exp_put(exp_ps);
2795 if (status != nfs_ok)
2796 return status;
2797
2798 /* locations<> */
2799 if (xdr_stream_encode_u32(xdr, fslocs->locations_count) != XDR_UNIT)
2800 return nfserr_resource;
2801 for (i = 0; i < fslocs->locations_count; i++) {
2802 status = nfsd4_encode_fs_location4(xdr, &fslocs->locations[i]);
2803 if (status != nfs_ok)
2804 return status;
2805 }
2806
2807 return nfs_ok;
2808 }
2809
nfsd4_encode_nfsace4(struct xdr_stream * xdr,struct svc_rqst * rqstp,struct nfs4_ace * ace)2810 static __be32 nfsd4_encode_nfsace4(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2811 struct nfs4_ace *ace)
2812 {
2813 __be32 status;
2814
2815 /* type */
2816 status = nfsd4_encode_acetype4(xdr, ace->type);
2817 if (status != nfs_ok)
2818 return nfserr_resource;
2819 /* flag */
2820 status = nfsd4_encode_aceflag4(xdr, ace->flag);
2821 if (status != nfs_ok)
2822 return nfserr_resource;
2823 /* access mask */
2824 status = nfsd4_encode_acemask4(xdr, ace->access_mask & NFS4_ACE_MASK_ALL);
2825 if (status != nfs_ok)
2826 return nfserr_resource;
2827 /* who */
2828 if (ace->whotype != NFS4_ACL_WHO_NAMED)
2829 return nfs4_acl_write_who(xdr, ace->whotype);
2830 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
2831 return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
2832 return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
2833 }
2834
2835 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
2836 FATTR4_WORD0_RDATTR_ERROR)
2837 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2838 #define WORD2_ABSENT_FS_ATTRS 0
2839
2840 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2841 static inline __be32
nfsd4_encode_security_label(struct xdr_stream * xdr,struct svc_rqst * rqstp,const struct lsm_context * context)2842 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2843 const struct lsm_context *context)
2844 {
2845 __be32 *p;
2846
2847 p = xdr_reserve_space(xdr, context->len + 4 + 4 + 4);
2848 if (!p)
2849 return nfserr_resource;
2850
2851 /*
2852 * For now we use a 0 here to indicate the null translation; in
2853 * the future we may place a call to translation code here.
2854 */
2855 *p++ = cpu_to_be32(0); /* lfs */
2856 *p++ = cpu_to_be32(0); /* pi */
2857 p = xdr_encode_opaque(p, context->context, context->len);
2858 return 0;
2859 }
2860 #else
2861 static inline __be32
nfsd4_encode_security_label(struct xdr_stream * xdr,struct svc_rqst * rqstp,struct lsm_context * context)2862 nfsd4_encode_security_label(struct xdr_stream *xdr, struct svc_rqst *rqstp,
2863 struct lsm_context *context)
2864 { return 0; }
2865 #endif
2866
fattr_handle_absent_fs(u32 * bmval0,u32 * bmval1,u32 * bmval2,u32 * rdattr_err)2867 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *bmval2, u32 *rdattr_err)
2868 {
2869 /* As per referral draft: */
2870 if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2871 *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2872 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2873 *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2874 *rdattr_err = NFSERR_MOVED;
2875 else
2876 return nfserr_moved;
2877 }
2878 *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2879 *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2880 *bmval2 &= WORD2_ABSENT_FS_ATTRS;
2881 return 0;
2882 }
2883
2884
nfsd4_get_mounted_on_ino(struct svc_export * exp,u64 * pino)2885 static int nfsd4_get_mounted_on_ino(struct svc_export *exp, u64 *pino)
2886 {
2887 struct path path = exp->ex_path;
2888 struct kstat stat;
2889 int err;
2890
2891 path_get(&path);
2892 while (follow_up(&path)) {
2893 if (path.dentry != path.mnt->mnt_root)
2894 break;
2895 }
2896 err = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
2897 path_put(&path);
2898 if (!err)
2899 *pino = stat.ino;
2900 return err;
2901 }
2902
2903 static __be32
nfsd4_encode_bitmap4(struct xdr_stream * xdr,u32 bmval0,u32 bmval1,u32 bmval2)2904 nfsd4_encode_bitmap4(struct xdr_stream *xdr, u32 bmval0, u32 bmval1, u32 bmval2)
2905 {
2906 __be32 *p;
2907
2908 if (bmval2) {
2909 p = xdr_reserve_space(xdr, XDR_UNIT * 4);
2910 if (!p)
2911 goto out_resource;
2912 *p++ = cpu_to_be32(3);
2913 *p++ = cpu_to_be32(bmval0);
2914 *p++ = cpu_to_be32(bmval1);
2915 *p++ = cpu_to_be32(bmval2);
2916 } else if (bmval1) {
2917 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
2918 if (!p)
2919 goto out_resource;
2920 *p++ = cpu_to_be32(2);
2921 *p++ = cpu_to_be32(bmval0);
2922 *p++ = cpu_to_be32(bmval1);
2923 } else {
2924 p = xdr_reserve_space(xdr, XDR_UNIT * 2);
2925 if (!p)
2926 goto out_resource;
2927 *p++ = cpu_to_be32(1);
2928 *p++ = cpu_to_be32(bmval0);
2929 }
2930
2931 return nfs_ok;
2932 out_resource:
2933 return nfserr_resource;
2934 }
2935
2936 struct nfsd4_fattr_args {
2937 struct svc_rqst *rqstp;
2938 struct svc_fh *fhp;
2939 struct svc_export *exp;
2940 struct dentry *dentry;
2941 struct kstat stat;
2942 struct kstatfs statfs;
2943 struct nfs4_acl *acl;
2944 u64 change_attr;
2945 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
2946 struct lsm_context context;
2947 #endif
2948 u32 rdattr_err;
2949 bool contextsupport;
2950 bool ignore_crossmnt;
2951 };
2952
2953 typedef __be32(*nfsd4_enc_attr)(struct xdr_stream *xdr,
2954 const struct nfsd4_fattr_args *args);
2955
nfsd4_encode_fattr4__noop(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)2956 static __be32 nfsd4_encode_fattr4__noop(struct xdr_stream *xdr,
2957 const struct nfsd4_fattr_args *args)
2958 {
2959 return nfs_ok;
2960 }
2961
nfsd4_encode_fattr4__true(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)2962 static __be32 nfsd4_encode_fattr4__true(struct xdr_stream *xdr,
2963 const struct nfsd4_fattr_args *args)
2964 {
2965 return nfsd4_encode_bool(xdr, true);
2966 }
2967
nfsd4_encode_fattr4__false(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)2968 static __be32 nfsd4_encode_fattr4__false(struct xdr_stream *xdr,
2969 const struct nfsd4_fattr_args *args)
2970 {
2971 return nfsd4_encode_bool(xdr, false);
2972 }
2973
nfsd4_encode_fattr4_supported_attrs(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)2974 static __be32 nfsd4_encode_fattr4_supported_attrs(struct xdr_stream *xdr,
2975 const struct nfsd4_fattr_args *args)
2976 {
2977 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
2978 u32 minorversion = resp->cstate.minorversion;
2979 u32 supp[3];
2980
2981 memcpy(supp, nfsd_suppattrs[minorversion], sizeof(supp));
2982 if (!IS_POSIXACL(d_inode(args->dentry)))
2983 supp[0] &= ~FATTR4_WORD0_ACL;
2984 if (!args->contextsupport)
2985 supp[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2986
2987 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
2988 }
2989
nfsd4_encode_fattr4_type(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)2990 static __be32 nfsd4_encode_fattr4_type(struct xdr_stream *xdr,
2991 const struct nfsd4_fattr_args *args)
2992 {
2993 __be32 *p;
2994
2995 p = xdr_reserve_space(xdr, XDR_UNIT);
2996 if (!p)
2997 return nfserr_resource;
2998
2999 switch (args->stat.mode & S_IFMT) {
3000 case S_IFIFO:
3001 *p = cpu_to_be32(NF4FIFO);
3002 break;
3003 case S_IFCHR:
3004 *p = cpu_to_be32(NF4CHR);
3005 break;
3006 case S_IFDIR:
3007 *p = cpu_to_be32(NF4DIR);
3008 break;
3009 case S_IFBLK:
3010 *p = cpu_to_be32(NF4BLK);
3011 break;
3012 case S_IFLNK:
3013 *p = cpu_to_be32(NF4LNK);
3014 break;
3015 case S_IFREG:
3016 *p = cpu_to_be32(NF4REG);
3017 break;
3018 case S_IFSOCK:
3019 *p = cpu_to_be32(NF4SOCK);
3020 break;
3021 default:
3022 return nfserr_serverfault;
3023 }
3024
3025 return nfs_ok;
3026 }
3027
nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3028 static __be32 nfsd4_encode_fattr4_fh_expire_type(struct xdr_stream *xdr,
3029 const struct nfsd4_fattr_args *args)
3030 {
3031 u32 mask;
3032
3033 mask = NFS4_FH_PERSISTENT;
3034 if (!(args->exp->ex_flags & NFSEXP_NOSUBTREECHECK))
3035 mask |= NFS4_FH_VOL_RENAME;
3036 return nfsd4_encode_uint32_t(xdr, mask);
3037 }
3038
nfsd4_encode_fattr4_change(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3039 static __be32 nfsd4_encode_fattr4_change(struct xdr_stream *xdr,
3040 const struct nfsd4_fattr_args *args)
3041 {
3042 const struct svc_export *exp = args->exp;
3043
3044 if (unlikely(exp->ex_flags & NFSEXP_V4ROOT)) {
3045 u32 flush_time = convert_to_wallclock(exp->cd->flush_time);
3046
3047 if (xdr_stream_encode_u32(xdr, flush_time) != XDR_UNIT)
3048 return nfserr_resource;
3049 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3050 return nfserr_resource;
3051 return nfs_ok;
3052 }
3053 return nfsd4_encode_changeid4(xdr, args->change_attr);
3054 }
3055
nfsd4_encode_fattr4_size(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3056 static __be32 nfsd4_encode_fattr4_size(struct xdr_stream *xdr,
3057 const struct nfsd4_fattr_args *args)
3058 {
3059 return nfsd4_encode_uint64_t(xdr, args->stat.size);
3060 }
3061
nfsd4_encode_fattr4_fsid(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3062 static __be32 nfsd4_encode_fattr4_fsid(struct xdr_stream *xdr,
3063 const struct nfsd4_fattr_args *args)
3064 {
3065 __be32 *p;
3066
3067 p = xdr_reserve_space(xdr, XDR_UNIT * 2 + XDR_UNIT * 2);
3068 if (!p)
3069 return nfserr_resource;
3070
3071 if (unlikely(args->exp->ex_fslocs.migrated)) {
3072 p = xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MAJOR);
3073 xdr_encode_hyper(p, NFS4_REFERRAL_FSID_MINOR);
3074 return nfs_ok;
3075 }
3076 switch (fsid_source(args->fhp)) {
3077 case FSIDSOURCE_FSID:
3078 p = xdr_encode_hyper(p, (u64)args->exp->ex_fsid);
3079 xdr_encode_hyper(p, (u64)0);
3080 break;
3081 case FSIDSOURCE_DEV:
3082 *p++ = xdr_zero;
3083 *p++ = cpu_to_be32(MAJOR(args->stat.dev));
3084 *p++ = xdr_zero;
3085 *p = cpu_to_be32(MINOR(args->stat.dev));
3086 break;
3087 case FSIDSOURCE_UUID:
3088 xdr_encode_opaque_fixed(p, args->exp->ex_uuid, EX_UUID_LEN);
3089 break;
3090 }
3091
3092 return nfs_ok;
3093 }
3094
nfsd4_encode_fattr4_lease_time(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3095 static __be32 nfsd4_encode_fattr4_lease_time(struct xdr_stream *xdr,
3096 const struct nfsd4_fattr_args *args)
3097 {
3098 struct nfsd_net *nn = net_generic(SVC_NET(args->rqstp), nfsd_net_id);
3099
3100 return nfsd4_encode_nfs_lease4(xdr, nn->nfsd4_lease);
3101 }
3102
nfsd4_encode_fattr4_rdattr_error(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3103 static __be32 nfsd4_encode_fattr4_rdattr_error(struct xdr_stream *xdr,
3104 const struct nfsd4_fattr_args *args)
3105 {
3106 return nfsd4_encode_uint32_t(xdr, args->rdattr_err);
3107 }
3108
nfsd4_encode_fattr4_aclsupport(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3109 static __be32 nfsd4_encode_fattr4_aclsupport(struct xdr_stream *xdr,
3110 const struct nfsd4_fattr_args *args)
3111 {
3112 u32 mask;
3113
3114 mask = 0;
3115 if (IS_POSIXACL(d_inode(args->dentry)))
3116 mask = ACL4_SUPPORT_ALLOW_ACL | ACL4_SUPPORT_DENY_ACL;
3117 return nfsd4_encode_uint32_t(xdr, mask);
3118 }
3119
nfsd4_encode_fattr4_acl(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3120 static __be32 nfsd4_encode_fattr4_acl(struct xdr_stream *xdr,
3121 const struct nfsd4_fattr_args *args)
3122 {
3123 struct nfs4_acl *acl = args->acl;
3124 struct nfs4_ace *ace;
3125 __be32 status;
3126
3127 /* nfsace4<> */
3128 if (!acl) {
3129 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
3130 return nfserr_resource;
3131 } else {
3132 if (xdr_stream_encode_u32(xdr, acl->naces) != XDR_UNIT)
3133 return nfserr_resource;
3134 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
3135 status = nfsd4_encode_nfsace4(xdr, args->rqstp, ace);
3136 if (status != nfs_ok)
3137 return status;
3138 }
3139 }
3140 return nfs_ok;
3141 }
3142
nfsd4_encode_fattr4_filehandle(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3143 static __be32 nfsd4_encode_fattr4_filehandle(struct xdr_stream *xdr,
3144 const struct nfsd4_fattr_args *args)
3145 {
3146 return nfsd4_encode_nfs_fh4(xdr, &args->fhp->fh_handle);
3147 }
3148
nfsd4_encode_fattr4_fileid(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3149 static __be32 nfsd4_encode_fattr4_fileid(struct xdr_stream *xdr,
3150 const struct nfsd4_fattr_args *args)
3151 {
3152 return nfsd4_encode_uint64_t(xdr, args->stat.ino);
3153 }
3154
nfsd4_encode_fattr4_files_avail(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3155 static __be32 nfsd4_encode_fattr4_files_avail(struct xdr_stream *xdr,
3156 const struct nfsd4_fattr_args *args)
3157 {
3158 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3159 }
3160
nfsd4_encode_fattr4_files_free(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3161 static __be32 nfsd4_encode_fattr4_files_free(struct xdr_stream *xdr,
3162 const struct nfsd4_fattr_args *args)
3163 {
3164 return nfsd4_encode_uint64_t(xdr, args->statfs.f_ffree);
3165 }
3166
nfsd4_encode_fattr4_files_total(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3167 static __be32 nfsd4_encode_fattr4_files_total(struct xdr_stream *xdr,
3168 const struct nfsd4_fattr_args *args)
3169 {
3170 return nfsd4_encode_uint64_t(xdr, args->statfs.f_files);
3171 }
3172
nfsd4_encode_fattr4_fs_locations(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3173 static __be32 nfsd4_encode_fattr4_fs_locations(struct xdr_stream *xdr,
3174 const struct nfsd4_fattr_args *args)
3175 {
3176 return nfsd4_encode_fs_locations4(xdr, args->rqstp, args->exp);
3177 }
3178
nfsd4_encode_fattr4_maxfilesize(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3179 static __be32 nfsd4_encode_fattr4_maxfilesize(struct xdr_stream *xdr,
3180 const struct nfsd4_fattr_args *args)
3181 {
3182 struct super_block *sb = args->exp->ex_path.mnt->mnt_sb;
3183
3184 return nfsd4_encode_uint64_t(xdr, sb->s_maxbytes);
3185 }
3186
nfsd4_encode_fattr4_maxlink(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3187 static __be32 nfsd4_encode_fattr4_maxlink(struct xdr_stream *xdr,
3188 const struct nfsd4_fattr_args *args)
3189 {
3190 return nfsd4_encode_uint32_t(xdr, 255);
3191 }
3192
nfsd4_encode_fattr4_maxname(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3193 static __be32 nfsd4_encode_fattr4_maxname(struct xdr_stream *xdr,
3194 const struct nfsd4_fattr_args *args)
3195 {
3196 return nfsd4_encode_uint32_t(xdr, args->statfs.f_namelen);
3197 }
3198
nfsd4_encode_fattr4_maxread(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3199 static __be32 nfsd4_encode_fattr4_maxread(struct xdr_stream *xdr,
3200 const struct nfsd4_fattr_args *args)
3201 {
3202 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3203 }
3204
nfsd4_encode_fattr4_maxwrite(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3205 static __be32 nfsd4_encode_fattr4_maxwrite(struct xdr_stream *xdr,
3206 const struct nfsd4_fattr_args *args)
3207 {
3208 return nfsd4_encode_uint64_t(xdr, svc_max_payload(args->rqstp));
3209 }
3210
nfsd4_encode_fattr4_mode(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3211 static __be32 nfsd4_encode_fattr4_mode(struct xdr_stream *xdr,
3212 const struct nfsd4_fattr_args *args)
3213 {
3214 return nfsd4_encode_mode4(xdr, args->stat.mode & S_IALLUGO);
3215 }
3216
nfsd4_encode_fattr4_numlinks(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3217 static __be32 nfsd4_encode_fattr4_numlinks(struct xdr_stream *xdr,
3218 const struct nfsd4_fattr_args *args)
3219 {
3220 return nfsd4_encode_uint32_t(xdr, args->stat.nlink);
3221 }
3222
nfsd4_encode_fattr4_owner(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3223 static __be32 nfsd4_encode_fattr4_owner(struct xdr_stream *xdr,
3224 const struct nfsd4_fattr_args *args)
3225 {
3226 return nfsd4_encode_user(xdr, args->rqstp, args->stat.uid);
3227 }
3228
nfsd4_encode_fattr4_owner_group(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3229 static __be32 nfsd4_encode_fattr4_owner_group(struct xdr_stream *xdr,
3230 const struct nfsd4_fattr_args *args)
3231 {
3232 return nfsd4_encode_group(xdr, args->rqstp, args->stat.gid);
3233 }
3234
nfsd4_encode_fattr4_rawdev(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3235 static __be32 nfsd4_encode_fattr4_rawdev(struct xdr_stream *xdr,
3236 const struct nfsd4_fattr_args *args)
3237 {
3238 return nfsd4_encode_specdata4(xdr, MAJOR(args->stat.rdev),
3239 MINOR(args->stat.rdev));
3240 }
3241
nfsd4_encode_fattr4_space_avail(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3242 static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
3243 const struct nfsd4_fattr_args *args)
3244 {
3245 u64 avail = (u64)args->statfs.f_bavail * (u64)args->statfs.f_bsize;
3246
3247 return nfsd4_encode_uint64_t(xdr, avail);
3248 }
3249
nfsd4_encode_fattr4_space_free(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3250 static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
3251 const struct nfsd4_fattr_args *args)
3252 {
3253 u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
3254
3255 return nfsd4_encode_uint64_t(xdr, free);
3256 }
3257
nfsd4_encode_fattr4_space_total(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3258 static __be32 nfsd4_encode_fattr4_space_total(struct xdr_stream *xdr,
3259 const struct nfsd4_fattr_args *args)
3260 {
3261 u64 total = (u64)args->statfs.f_blocks * (u64)args->statfs.f_bsize;
3262
3263 return nfsd4_encode_uint64_t(xdr, total);
3264 }
3265
nfsd4_encode_fattr4_space_used(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3266 static __be32 nfsd4_encode_fattr4_space_used(struct xdr_stream *xdr,
3267 const struct nfsd4_fattr_args *args)
3268 {
3269 return nfsd4_encode_uint64_t(xdr, (u64)args->stat.blocks << 9);
3270 }
3271
nfsd4_encode_fattr4_time_access(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3272 static __be32 nfsd4_encode_fattr4_time_access(struct xdr_stream *xdr,
3273 const struct nfsd4_fattr_args *args)
3274 {
3275 return nfsd4_encode_nfstime4(xdr, &args->stat.atime);
3276 }
3277
nfsd4_encode_fattr4_time_create(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3278 static __be32 nfsd4_encode_fattr4_time_create(struct xdr_stream *xdr,
3279 const struct nfsd4_fattr_args *args)
3280 {
3281 return nfsd4_encode_nfstime4(xdr, &args->stat.btime);
3282 }
3283
3284 /*
3285 * ctime (in NFSv4, time_metadata) is not writeable, and the client
3286 * doesn't really care what resolution could theoretically be stored by
3287 * the filesystem.
3288 *
3289 * The client cares how close together changes can be while still
3290 * guaranteeing ctime changes. For most filesystems (which have
3291 * timestamps with nanosecond fields) that is limited by the resolution
3292 * of the time returned from current_time() (which I'm assuming to be
3293 * 1/HZ).
3294 */
nfsd4_encode_fattr4_time_delta(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3295 static __be32 nfsd4_encode_fattr4_time_delta(struct xdr_stream *xdr,
3296 const struct nfsd4_fattr_args *args)
3297 {
3298 const struct inode *inode = d_inode(args->dentry);
3299 u32 ns = max_t(u32, NSEC_PER_SEC/HZ, inode->i_sb->s_time_gran);
3300 struct timespec64 ts = ns_to_timespec64(ns);
3301
3302 return nfsd4_encode_nfstime4(xdr, &ts);
3303 }
3304
nfsd4_encode_fattr4_time_metadata(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3305 static __be32 nfsd4_encode_fattr4_time_metadata(struct xdr_stream *xdr,
3306 const struct nfsd4_fattr_args *args)
3307 {
3308 return nfsd4_encode_nfstime4(xdr, &args->stat.ctime);
3309 }
3310
nfsd4_encode_fattr4_time_modify(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3311 static __be32 nfsd4_encode_fattr4_time_modify(struct xdr_stream *xdr,
3312 const struct nfsd4_fattr_args *args)
3313 {
3314 return nfsd4_encode_nfstime4(xdr, &args->stat.mtime);
3315 }
3316
nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3317 static __be32 nfsd4_encode_fattr4_mounted_on_fileid(struct xdr_stream *xdr,
3318 const struct nfsd4_fattr_args *args)
3319 {
3320 u64 ino;
3321 int err;
3322
3323 if (!args->ignore_crossmnt &&
3324 args->dentry == args->exp->ex_path.mnt->mnt_root) {
3325 err = nfsd4_get_mounted_on_ino(args->exp, &ino);
3326 if (err)
3327 return nfserrno(err);
3328 } else
3329 ino = args->stat.ino;
3330
3331 return nfsd4_encode_uint64_t(xdr, ino);
3332 }
3333
3334 #ifdef CONFIG_NFSD_PNFS
3335
nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3336 static __be32 nfsd4_encode_fattr4_fs_layout_types(struct xdr_stream *xdr,
3337 const struct nfsd4_fattr_args *args)
3338 {
3339 unsigned long mask = args->exp->ex_layout_types;
3340 int i;
3341
3342 /* Hamming weight of @mask is the number of layout types to return */
3343 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3344 return nfserr_resource;
3345 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3346 if (mask & BIT(i)) {
3347 /* layouttype4 */
3348 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3349 return nfserr_resource;
3350 }
3351 return nfs_ok;
3352 }
3353
nfsd4_encode_fattr4_layout_types(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3354 static __be32 nfsd4_encode_fattr4_layout_types(struct xdr_stream *xdr,
3355 const struct nfsd4_fattr_args *args)
3356 {
3357 unsigned long mask = args->exp->ex_layout_types;
3358 int i;
3359
3360 /* Hamming weight of @mask is the number of layout types to return */
3361 if (xdr_stream_encode_u32(xdr, hweight_long(mask)) != XDR_UNIT)
3362 return nfserr_resource;
3363 for (i = LAYOUT_NFSV4_1_FILES; i < LAYOUT_TYPE_MAX; ++i)
3364 if (mask & BIT(i)) {
3365 /* layouttype4 */
3366 if (xdr_stream_encode_u32(xdr, i) != XDR_UNIT)
3367 return nfserr_resource;
3368 }
3369 return nfs_ok;
3370 }
3371
nfsd4_encode_fattr4_layout_blksize(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3372 static __be32 nfsd4_encode_fattr4_layout_blksize(struct xdr_stream *xdr,
3373 const struct nfsd4_fattr_args *args)
3374 {
3375 return nfsd4_encode_uint32_t(xdr, args->stat.blksize);
3376 }
3377
3378 #endif
3379
nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3380 static __be32 nfsd4_encode_fattr4_suppattr_exclcreat(struct xdr_stream *xdr,
3381 const struct nfsd4_fattr_args *args)
3382 {
3383 struct nfsd4_compoundres *resp = args->rqstp->rq_resp;
3384 u32 supp[3];
3385
3386 memcpy(supp, nfsd_suppattrs[resp->cstate.minorversion], sizeof(supp));
3387 supp[0] &= NFSD_SUPPATTR_EXCLCREAT_WORD0;
3388 supp[1] &= NFSD_SUPPATTR_EXCLCREAT_WORD1;
3389 supp[2] &= NFSD_SUPPATTR_EXCLCREAT_WORD2;
3390
3391 return nfsd4_encode_bitmap4(xdr, supp[0], supp[1], supp[2]);
3392 }
3393
3394 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
nfsd4_encode_fattr4_sec_label(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3395 static __be32 nfsd4_encode_fattr4_sec_label(struct xdr_stream *xdr,
3396 const struct nfsd4_fattr_args *args)
3397 {
3398 return nfsd4_encode_security_label(xdr, args->rqstp, &args->context);
3399 }
3400 #endif
3401
nfsd4_encode_fattr4_xattr_support(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3402 static __be32 nfsd4_encode_fattr4_xattr_support(struct xdr_stream *xdr,
3403 const struct nfsd4_fattr_args *args)
3404 {
3405 int err = xattr_supports_user_prefix(d_inode(args->dentry));
3406
3407 return nfsd4_encode_bool(xdr, err == 0);
3408 }
3409
3410 #define NFSD_OA_SHARE_ACCESS (BIT(OPEN_ARGS_SHARE_ACCESS_READ) | \
3411 BIT(OPEN_ARGS_SHARE_ACCESS_WRITE) | \
3412 BIT(OPEN_ARGS_SHARE_ACCESS_BOTH))
3413
3414 #define NFSD_OA_SHARE_DENY (BIT(OPEN_ARGS_SHARE_DENY_NONE) | \
3415 BIT(OPEN_ARGS_SHARE_DENY_READ) | \
3416 BIT(OPEN_ARGS_SHARE_DENY_WRITE) | \
3417 BIT(OPEN_ARGS_SHARE_DENY_BOTH))
3418
3419 #define NFSD_OA_SHARE_ACCESS_WANT (BIT(OPEN_ARGS_SHARE_ACCESS_WANT_ANY_DELEG) | \
3420 BIT(OPEN_ARGS_SHARE_ACCESS_WANT_NO_DELEG) | \
3421 BIT(OPEN_ARGS_SHARE_ACCESS_WANT_CANCEL) | \
3422 BIT(OPEN_ARGS_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS) | \
3423 BIT(OPEN_ARGS_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION))
3424
3425 #define NFSD_OA_OPEN_CLAIM (BIT(OPEN_ARGS_OPEN_CLAIM_NULL) | \
3426 BIT(OPEN_ARGS_OPEN_CLAIM_PREVIOUS) | \
3427 BIT(OPEN_ARGS_OPEN_CLAIM_DELEGATE_CUR) | \
3428 BIT(OPEN_ARGS_OPEN_CLAIM_DELEGATE_PREV)| \
3429 BIT(OPEN_ARGS_OPEN_CLAIM_FH) | \
3430 BIT(OPEN_ARGS_OPEN_CLAIM_DELEG_CUR_FH) | \
3431 BIT(OPEN_ARGS_OPEN_CLAIM_DELEG_PREV_FH))
3432
3433 #define NFSD_OA_CREATE_MODE (BIT(OPEN_ARGS_CREATEMODE_UNCHECKED4) | \
3434 BIT(OPEN_ARGS_CREATE_MODE_GUARDED) | \
3435 BIT(OPEN_ARGS_CREATEMODE_EXCLUSIVE4) | \
3436 BIT(OPEN_ARGS_CREATE_MODE_EXCLUSIVE4_1))
3437
3438 static uint32_t oa_share_access = NFSD_OA_SHARE_ACCESS;
3439 static uint32_t oa_share_deny = NFSD_OA_SHARE_DENY;
3440 static uint32_t oa_share_access_want = NFSD_OA_SHARE_ACCESS_WANT;
3441 static uint32_t oa_open_claim = NFSD_OA_OPEN_CLAIM;
3442 static uint32_t oa_create_mode = NFSD_OA_CREATE_MODE;
3443
3444 static const struct open_arguments4 nfsd_open_arguments = {
3445 .oa_share_access = { .count = 1, .element = &oa_share_access },
3446 .oa_share_deny = { .count = 1, .element = &oa_share_deny },
3447 .oa_share_access_want = { .count = 1, .element = &oa_share_access_want },
3448 .oa_open_claim = { .count = 1, .element = &oa_open_claim },
3449 .oa_create_mode = { .count = 1, .element = &oa_create_mode },
3450 };
3451
nfsd4_encode_fattr4_open_arguments(struct xdr_stream * xdr,const struct nfsd4_fattr_args * args)3452 static __be32 nfsd4_encode_fattr4_open_arguments(struct xdr_stream *xdr,
3453 const struct nfsd4_fattr_args *args)
3454 {
3455 if (!xdrgen_encode_fattr4_open_arguments(xdr, &nfsd_open_arguments))
3456 return nfserr_resource;
3457 return nfs_ok;
3458 }
3459
3460 static const nfsd4_enc_attr nfsd4_enc_fattr4_encode_ops[] = {
3461 [FATTR4_SUPPORTED_ATTRS] = nfsd4_encode_fattr4_supported_attrs,
3462 [FATTR4_TYPE] = nfsd4_encode_fattr4_type,
3463 [FATTR4_FH_EXPIRE_TYPE] = nfsd4_encode_fattr4_fh_expire_type,
3464 [FATTR4_CHANGE] = nfsd4_encode_fattr4_change,
3465 [FATTR4_SIZE] = nfsd4_encode_fattr4_size,
3466 [FATTR4_LINK_SUPPORT] = nfsd4_encode_fattr4__true,
3467 [FATTR4_SYMLINK_SUPPORT] = nfsd4_encode_fattr4__true,
3468 [FATTR4_NAMED_ATTR] = nfsd4_encode_fattr4__false,
3469 [FATTR4_FSID] = nfsd4_encode_fattr4_fsid,
3470 [FATTR4_UNIQUE_HANDLES] = nfsd4_encode_fattr4__true,
3471 [FATTR4_LEASE_TIME] = nfsd4_encode_fattr4_lease_time,
3472 [FATTR4_RDATTR_ERROR] = nfsd4_encode_fattr4_rdattr_error,
3473 [FATTR4_ACL] = nfsd4_encode_fattr4_acl,
3474 [FATTR4_ACLSUPPORT] = nfsd4_encode_fattr4_aclsupport,
3475 [FATTR4_ARCHIVE] = nfsd4_encode_fattr4__noop,
3476 [FATTR4_CANSETTIME] = nfsd4_encode_fattr4__true,
3477 [FATTR4_CASE_INSENSITIVE] = nfsd4_encode_fattr4__false,
3478 [FATTR4_CASE_PRESERVING] = nfsd4_encode_fattr4__true,
3479 [FATTR4_CHOWN_RESTRICTED] = nfsd4_encode_fattr4__true,
3480 [FATTR4_FILEHANDLE] = nfsd4_encode_fattr4_filehandle,
3481 [FATTR4_FILEID] = nfsd4_encode_fattr4_fileid,
3482 [FATTR4_FILES_AVAIL] = nfsd4_encode_fattr4_files_avail,
3483 [FATTR4_FILES_FREE] = nfsd4_encode_fattr4_files_free,
3484 [FATTR4_FILES_TOTAL] = nfsd4_encode_fattr4_files_total,
3485 [FATTR4_FS_LOCATIONS] = nfsd4_encode_fattr4_fs_locations,
3486 [FATTR4_HIDDEN] = nfsd4_encode_fattr4__noop,
3487 [FATTR4_HOMOGENEOUS] = nfsd4_encode_fattr4__true,
3488 [FATTR4_MAXFILESIZE] = nfsd4_encode_fattr4_maxfilesize,
3489 [FATTR4_MAXLINK] = nfsd4_encode_fattr4_maxlink,
3490 [FATTR4_MAXNAME] = nfsd4_encode_fattr4_maxname,
3491 [FATTR4_MAXREAD] = nfsd4_encode_fattr4_maxread,
3492 [FATTR4_MAXWRITE] = nfsd4_encode_fattr4_maxwrite,
3493 [FATTR4_MIMETYPE] = nfsd4_encode_fattr4__noop,
3494 [FATTR4_MODE] = nfsd4_encode_fattr4_mode,
3495 [FATTR4_NO_TRUNC] = nfsd4_encode_fattr4__true,
3496 [FATTR4_NUMLINKS] = nfsd4_encode_fattr4_numlinks,
3497 [FATTR4_OWNER] = nfsd4_encode_fattr4_owner,
3498 [FATTR4_OWNER_GROUP] = nfsd4_encode_fattr4_owner_group,
3499 [FATTR4_QUOTA_AVAIL_HARD] = nfsd4_encode_fattr4__noop,
3500 [FATTR4_QUOTA_AVAIL_SOFT] = nfsd4_encode_fattr4__noop,
3501 [FATTR4_QUOTA_USED] = nfsd4_encode_fattr4__noop,
3502 [FATTR4_RAWDEV] = nfsd4_encode_fattr4_rawdev,
3503 [FATTR4_SPACE_AVAIL] = nfsd4_encode_fattr4_space_avail,
3504 [FATTR4_SPACE_FREE] = nfsd4_encode_fattr4_space_free,
3505 [FATTR4_SPACE_TOTAL] = nfsd4_encode_fattr4_space_total,
3506 [FATTR4_SPACE_USED] = nfsd4_encode_fattr4_space_used,
3507 [FATTR4_SYSTEM] = nfsd4_encode_fattr4__noop,
3508 [FATTR4_TIME_ACCESS] = nfsd4_encode_fattr4_time_access,
3509 [FATTR4_TIME_ACCESS_SET] = nfsd4_encode_fattr4__noop,
3510 [FATTR4_TIME_BACKUP] = nfsd4_encode_fattr4__noop,
3511 [FATTR4_TIME_CREATE] = nfsd4_encode_fattr4_time_create,
3512 [FATTR4_TIME_DELTA] = nfsd4_encode_fattr4_time_delta,
3513 [FATTR4_TIME_METADATA] = nfsd4_encode_fattr4_time_metadata,
3514 [FATTR4_TIME_MODIFY] = nfsd4_encode_fattr4_time_modify,
3515 [FATTR4_TIME_MODIFY_SET] = nfsd4_encode_fattr4__noop,
3516 [FATTR4_MOUNTED_ON_FILEID] = nfsd4_encode_fattr4_mounted_on_fileid,
3517 [FATTR4_DIR_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3518 [FATTR4_DIRENT_NOTIF_DELAY] = nfsd4_encode_fattr4__noop,
3519 [FATTR4_DACL] = nfsd4_encode_fattr4__noop,
3520 [FATTR4_SACL] = nfsd4_encode_fattr4__noop,
3521 [FATTR4_CHANGE_POLICY] = nfsd4_encode_fattr4__noop,
3522 [FATTR4_FS_STATUS] = nfsd4_encode_fattr4__noop,
3523
3524 #ifdef CONFIG_NFSD_PNFS
3525 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4_fs_layout_types,
3526 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3527 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4_layout_types,
3528 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4_layout_blksize,
3529 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3530 #else
3531 [FATTR4_FS_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3532 [FATTR4_LAYOUT_HINT] = nfsd4_encode_fattr4__noop,
3533 [FATTR4_LAYOUT_TYPES] = nfsd4_encode_fattr4__noop,
3534 [FATTR4_LAYOUT_BLKSIZE] = nfsd4_encode_fattr4__noop,
3535 [FATTR4_LAYOUT_ALIGNMENT] = nfsd4_encode_fattr4__noop,
3536 #endif
3537
3538 [FATTR4_FS_LOCATIONS_INFO] = nfsd4_encode_fattr4__noop,
3539 [FATTR4_MDSTHRESHOLD] = nfsd4_encode_fattr4__noop,
3540 [FATTR4_RETENTION_GET] = nfsd4_encode_fattr4__noop,
3541 [FATTR4_RETENTION_SET] = nfsd4_encode_fattr4__noop,
3542 [FATTR4_RETENTEVT_GET] = nfsd4_encode_fattr4__noop,
3543 [FATTR4_RETENTEVT_SET] = nfsd4_encode_fattr4__noop,
3544 [FATTR4_RETENTION_HOLD] = nfsd4_encode_fattr4__noop,
3545 [FATTR4_MODE_SET_MASKED] = nfsd4_encode_fattr4__noop,
3546 [FATTR4_SUPPATTR_EXCLCREAT] = nfsd4_encode_fattr4_suppattr_exclcreat,
3547 [FATTR4_FS_CHARSET_CAP] = nfsd4_encode_fattr4__noop,
3548 [FATTR4_CLONE_BLKSIZE] = nfsd4_encode_fattr4__noop,
3549 [FATTR4_SPACE_FREED] = nfsd4_encode_fattr4__noop,
3550 [FATTR4_CHANGE_ATTR_TYPE] = nfsd4_encode_fattr4__noop,
3551
3552 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3553 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4_sec_label,
3554 #else
3555 [FATTR4_SEC_LABEL] = nfsd4_encode_fattr4__noop,
3556 #endif
3557
3558 [FATTR4_MODE_UMASK] = nfsd4_encode_fattr4__noop,
3559 [FATTR4_XATTR_SUPPORT] = nfsd4_encode_fattr4_xattr_support,
3560 [FATTR4_OPEN_ARGUMENTS] = nfsd4_encode_fattr4_open_arguments,
3561 };
3562
3563 /*
3564 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
3565 * ourselves.
3566 */
3567 static __be32
nfsd4_encode_fattr4(struct svc_rqst * rqstp,struct xdr_stream * xdr,struct svc_fh * fhp,struct svc_export * exp,struct dentry * dentry,const u32 * bmval,int ignore_crossmnt)3568 nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
3569 struct svc_fh *fhp, struct svc_export *exp,
3570 struct dentry *dentry, const u32 *bmval,
3571 int ignore_crossmnt)
3572 {
3573 DECLARE_BITMAP(attr_bitmap, ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3574 struct nfs4_delegation *dp = NULL;
3575 struct nfsd4_fattr_args args;
3576 struct svc_fh *tempfh = NULL;
3577 int starting_len = xdr->buf->len;
3578 unsigned int attrlen_offset;
3579 __be32 attrlen, status;
3580 u32 attrmask[3];
3581 int err;
3582 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3583 u32 minorversion = resp->cstate.minorversion;
3584 struct path path = {
3585 .mnt = exp->ex_path.mnt,
3586 .dentry = dentry,
3587 };
3588 unsigned long bit;
3589
3590 WARN_ON_ONCE(bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1);
3591 WARN_ON_ONCE(!nfsd_attrs_supported(minorversion, bmval));
3592
3593 args.rqstp = rqstp;
3594 args.exp = exp;
3595 args.dentry = dentry;
3596 args.ignore_crossmnt = (ignore_crossmnt != 0);
3597 args.acl = NULL;
3598 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3599 args.context.context = NULL;
3600 #endif
3601
3602 /*
3603 * Make a local copy of the attribute bitmap that can be modified.
3604 */
3605 attrmask[0] = bmval[0];
3606 attrmask[1] = bmval[1];
3607 attrmask[2] = bmval[2];
3608
3609 args.rdattr_err = 0;
3610 if (exp->ex_fslocs.migrated) {
3611 status = fattr_handle_absent_fs(&attrmask[0], &attrmask[1],
3612 &attrmask[2], &args.rdattr_err);
3613 if (status)
3614 goto out;
3615 }
3616 if ((attrmask[0] & (FATTR4_WORD0_CHANGE |
3617 FATTR4_WORD0_SIZE)) ||
3618 (attrmask[1] & (FATTR4_WORD1_TIME_ACCESS |
3619 FATTR4_WORD1_TIME_MODIFY |
3620 FATTR4_WORD1_TIME_METADATA))) {
3621 status = nfsd4_deleg_getattr_conflict(rqstp, dentry, &dp);
3622 if (status)
3623 goto out;
3624 }
3625
3626 err = vfs_getattr(&path, &args.stat,
3627 STATX_BASIC_STATS | STATX_BTIME | STATX_CHANGE_COOKIE,
3628 AT_STATX_SYNC_AS_STAT);
3629 if (dp) {
3630 struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr;
3631
3632 if (ncf->ncf_file_modified) {
3633 ++ncf->ncf_initial_cinfo;
3634 args.stat.size = ncf->ncf_cur_fsize;
3635 if (!timespec64_is_epoch(&ncf->ncf_cb_mtime))
3636 args.stat.mtime = ncf->ncf_cb_mtime;
3637 }
3638 args.change_attr = ncf->ncf_initial_cinfo;
3639
3640 if (!timespec64_is_epoch(&ncf->ncf_cb_atime))
3641 args.stat.atime = ncf->ncf_cb_atime;
3642
3643 nfs4_put_stid(&dp->dl_stid);
3644 } else {
3645 args.change_attr = nfsd4_change_attribute(&args.stat);
3646 }
3647
3648 if (err)
3649 goto out_nfserr;
3650
3651 if (!(args.stat.result_mask & STATX_BTIME))
3652 /* underlying FS does not offer btime so we can't share it */
3653 attrmask[1] &= ~FATTR4_WORD1_TIME_CREATE;
3654 if ((attrmask[0] & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
3655 FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
3656 (attrmask[1] & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
3657 FATTR4_WORD1_SPACE_TOTAL))) {
3658 err = vfs_statfs(&path, &args.statfs);
3659 if (err)
3660 goto out_nfserr;
3661 }
3662 if ((attrmask[0] & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) &&
3663 !fhp) {
3664 tempfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
3665 status = nfserr_jukebox;
3666 if (!tempfh)
3667 goto out;
3668 fh_init(tempfh, NFS4_FHSIZE);
3669 status = fh_compose(tempfh, exp, dentry, NULL);
3670 if (status)
3671 goto out;
3672 args.fhp = tempfh;
3673 } else
3674 args.fhp = fhp;
3675
3676 if (attrmask[0] & FATTR4_WORD0_ACL) {
3677 err = nfsd4_get_nfs4_acl(rqstp, dentry, &args.acl);
3678 if (err == -EOPNOTSUPP)
3679 attrmask[0] &= ~FATTR4_WORD0_ACL;
3680 else if (err == -EINVAL) {
3681 status = nfserr_attrnotsupp;
3682 goto out;
3683 } else if (err != 0)
3684 goto out_nfserr;
3685 }
3686
3687 args.contextsupport = false;
3688
3689 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3690 if ((attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) ||
3691 attrmask[0] & FATTR4_WORD0_SUPPORTED_ATTRS) {
3692 if (exp->ex_flags & NFSEXP_SECURITY_LABEL)
3693 err = security_inode_getsecctx(d_inode(dentry),
3694 &args.context);
3695 else
3696 err = -EOPNOTSUPP;
3697 args.contextsupport = (err == 0);
3698 if (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL) {
3699 if (err == -EOPNOTSUPP)
3700 attrmask[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3701 else if (err)
3702 goto out_nfserr;
3703 }
3704 }
3705 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3706
3707 /* attrmask */
3708 status = nfsd4_encode_bitmap4(xdr, attrmask[0], attrmask[1],
3709 attrmask[2]);
3710 if (status)
3711 goto out;
3712
3713 /* attr_vals */
3714 attrlen_offset = xdr->buf->len;
3715 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT)))
3716 goto out_resource;
3717 bitmap_from_arr32(attr_bitmap, attrmask,
3718 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops));
3719 for_each_set_bit(bit, attr_bitmap,
3720 ARRAY_SIZE(nfsd4_enc_fattr4_encode_ops)) {
3721 status = nfsd4_enc_fattr4_encode_ops[bit](xdr, &args);
3722 if (status != nfs_ok)
3723 goto out;
3724 }
3725 attrlen = cpu_to_be32(xdr->buf->len - attrlen_offset - XDR_UNIT);
3726 write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, XDR_UNIT);
3727 status = nfs_ok;
3728
3729 out:
3730 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
3731 if (args.context.context)
3732 security_release_secctx(&args.context);
3733 #endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
3734 kfree(args.acl);
3735 if (tempfh) {
3736 fh_put(tempfh);
3737 kfree(tempfh);
3738 }
3739 if (status)
3740 xdr_truncate_encode(xdr, starting_len);
3741 return status;
3742 out_nfserr:
3743 status = nfserrno(err);
3744 goto out;
3745 out_resource:
3746 status = nfserr_resource;
3747 goto out;
3748 }
3749
svcxdr_init_encode_from_buffer(struct xdr_stream * xdr,struct xdr_buf * buf,__be32 * p,int bytes)3750 static void svcxdr_init_encode_from_buffer(struct xdr_stream *xdr,
3751 struct xdr_buf *buf, __be32 *p, int bytes)
3752 {
3753 xdr->scratch.iov_len = 0;
3754 memset(buf, 0, sizeof(struct xdr_buf));
3755 buf->head[0].iov_base = p;
3756 buf->head[0].iov_len = 0;
3757 buf->len = 0;
3758 xdr->buf = buf;
3759 xdr->iov = buf->head;
3760 xdr->p = p;
3761 xdr->end = (void *)p + bytes;
3762 buf->buflen = bytes;
3763 }
3764
nfsd4_encode_fattr_to_buf(__be32 ** p,int words,struct svc_fh * fhp,struct svc_export * exp,struct dentry * dentry,u32 * bmval,struct svc_rqst * rqstp,int ignore_crossmnt)3765 __be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
3766 struct svc_fh *fhp, struct svc_export *exp,
3767 struct dentry *dentry, u32 *bmval,
3768 struct svc_rqst *rqstp, int ignore_crossmnt)
3769 {
3770 struct xdr_buf dummy;
3771 struct xdr_stream xdr;
3772 __be32 ret;
3773
3774 svcxdr_init_encode_from_buffer(&xdr, &dummy, *p, words << 2);
3775 ret = nfsd4_encode_fattr4(rqstp, &xdr, fhp, exp, dentry, bmval,
3776 ignore_crossmnt);
3777 *p = xdr.p;
3778 return ret;
3779 }
3780
3781 /*
3782 * The buffer space for this field was reserved during a previous
3783 * call to nfsd4_encode_entry4().
3784 */
nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir * readdir,u64 offset)3785 static void nfsd4_encode_entry4_nfs_cookie4(const struct nfsd4_readdir *readdir,
3786 u64 offset)
3787 {
3788 __be64 cookie = cpu_to_be64(offset);
3789 struct xdr_stream *xdr = readdir->xdr;
3790
3791 if (!readdir->cookie_offset)
3792 return;
3793 write_bytes_to_xdr_buf(xdr->buf, readdir->cookie_offset, &cookie,
3794 sizeof(cookie));
3795 }
3796
attributes_need_mount(u32 * bmval)3797 static inline int attributes_need_mount(u32 *bmval)
3798 {
3799 if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
3800 return 1;
3801 if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
3802 return 1;
3803 return 0;
3804 }
3805
3806 static __be32
nfsd4_encode_entry4_fattr(struct nfsd4_readdir * cd,const char * name,int namlen)3807 nfsd4_encode_entry4_fattr(struct nfsd4_readdir *cd, const char *name,
3808 int namlen)
3809 {
3810 struct svc_export *exp = cd->rd_fhp->fh_export;
3811 struct dentry *dentry;
3812 __be32 nfserr;
3813 int ignore_crossmnt = 0;
3814
3815 dentry = lookup_positive_unlocked(name, cd->rd_fhp->fh_dentry, namlen);
3816 if (IS_ERR(dentry))
3817 return nfserrno(PTR_ERR(dentry));
3818
3819 exp_get(exp);
3820 /*
3821 * In the case of a mountpoint, the client may be asking for
3822 * attributes that are only properties of the underlying filesystem
3823 * as opposed to the cross-mounted file system. In such a case,
3824 * we will not follow the cross mount and will fill the attribtutes
3825 * directly from the mountpoint dentry.
3826 */
3827 if (nfsd_mountpoint(dentry, exp)) {
3828 int err;
3829
3830 if (!(exp->ex_flags & NFSEXP_V4ROOT)
3831 && !attributes_need_mount(cd->rd_bmval)) {
3832 ignore_crossmnt = 1;
3833 goto out_encode;
3834 }
3835 /*
3836 * Why the heck aren't we just using nfsd_lookup??
3837 * Different "."/".." handling? Something else?
3838 * At least, add a comment here to explain....
3839 */
3840 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
3841 if (err) {
3842 nfserr = nfserrno(err);
3843 goto out_put;
3844 }
3845 nfserr = check_nfsd_access(exp, cd->rd_rqstp, false);
3846 if (nfserr)
3847 goto out_put;
3848
3849 }
3850 out_encode:
3851 nfserr = nfsd4_encode_fattr4(cd->rd_rqstp, cd->xdr, NULL, exp, dentry,
3852 cd->rd_bmval, ignore_crossmnt);
3853 out_put:
3854 dput(dentry);
3855 exp_put(exp);
3856 return nfserr;
3857 }
3858
3859 static __be32
nfsd4_encode_entry4_rdattr_error(struct xdr_stream * xdr,__be32 nfserr)3860 nfsd4_encode_entry4_rdattr_error(struct xdr_stream *xdr, __be32 nfserr)
3861 {
3862 __be32 status;
3863
3864 /* attrmask */
3865 status = nfsd4_encode_bitmap4(xdr, FATTR4_WORD0_RDATTR_ERROR, 0, 0);
3866 if (status != nfs_ok)
3867 return status;
3868 /* attr_vals */
3869 if (xdr_stream_encode_u32(xdr, XDR_UNIT) != XDR_UNIT)
3870 return nfserr_resource;
3871 /* rdattr_error */
3872 if (xdr_stream_encode_be32(xdr, nfserr) != XDR_UNIT)
3873 return nfserr_resource;
3874 return nfs_ok;
3875 }
3876
3877 static int
nfsd4_encode_entry4(void * ccdv,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)3878 nfsd4_encode_entry4(void *ccdv, const char *name, int namlen,
3879 loff_t offset, u64 ino, unsigned int d_type)
3880 {
3881 struct readdir_cd *ccd = ccdv;
3882 struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
3883 struct xdr_stream *xdr = cd->xdr;
3884 int start_offset = xdr->buf->len;
3885 int cookie_offset;
3886 u32 name_and_cookie;
3887 int entry_bytes;
3888 __be32 nfserr = nfserr_toosmall;
3889
3890 /* In nfsv4, "." and ".." never make it onto the wire.. */
3891 if (name && isdotent(name, namlen)) {
3892 cd->common.err = nfs_ok;
3893 return 0;
3894 }
3895
3896 /* Encode the previous entry's cookie value */
3897 nfsd4_encode_entry4_nfs_cookie4(cd, offset);
3898
3899 if (xdr_stream_encode_item_present(xdr) != XDR_UNIT)
3900 goto fail;
3901
3902 /* Reserve send buffer space for this entry's cookie value. */
3903 cookie_offset = xdr->buf->len;
3904 if (nfsd4_encode_nfs_cookie4(xdr, OFFSET_MAX) != nfs_ok)
3905 goto fail;
3906 if (nfsd4_encode_component4(xdr, name, namlen) != nfs_ok)
3907 goto fail;
3908 nfserr = nfsd4_encode_entry4_fattr(cd, name, namlen);
3909 switch (nfserr) {
3910 case nfs_ok:
3911 break;
3912 case nfserr_resource:
3913 nfserr = nfserr_toosmall;
3914 goto fail;
3915 case nfserr_noent:
3916 xdr_truncate_encode(xdr, start_offset);
3917 goto skip_entry;
3918 case nfserr_jukebox:
3919 /*
3920 * The pseudoroot should only display dentries that lead to
3921 * exports. If we get EJUKEBOX here, then we can't tell whether
3922 * this entry should be included. Just fail the whole READDIR
3923 * with NFS4ERR_DELAY in that case, and hope that the situation
3924 * will resolve itself by the client's next attempt.
3925 */
3926 if (cd->rd_fhp->fh_export->ex_flags & NFSEXP_V4ROOT)
3927 goto fail;
3928 fallthrough;
3929 default:
3930 /*
3931 * If the client requested the RDATTR_ERROR attribute,
3932 * we stuff the error code into this attribute
3933 * and continue. If this attribute was not requested,
3934 * then in accordance with the spec, we fail the
3935 * entire READDIR operation(!)
3936 */
3937 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
3938 goto fail;
3939 if (nfsd4_encode_entry4_rdattr_error(xdr, nfserr)) {
3940 nfserr = nfserr_toosmall;
3941 goto fail;
3942 }
3943 }
3944 nfserr = nfserr_toosmall;
3945 entry_bytes = xdr->buf->len - start_offset;
3946 if (entry_bytes > cd->rd_maxcount)
3947 goto fail;
3948 cd->rd_maxcount -= entry_bytes;
3949 /*
3950 * RFC 3530 14.2.24 describes rd_dircount as only a "hint", and
3951 * notes that it could be zero. If it is zero, then the server
3952 * should enforce only the rd_maxcount value.
3953 */
3954 if (cd->rd_dircount) {
3955 name_and_cookie = 4 + 4 * XDR_QUADLEN(namlen) + 8;
3956 if (name_and_cookie > cd->rd_dircount && cd->cookie_offset)
3957 goto fail;
3958 cd->rd_dircount -= min(cd->rd_dircount, name_and_cookie);
3959 if (!cd->rd_dircount)
3960 cd->rd_maxcount = 0;
3961 }
3962
3963 cd->cookie_offset = cookie_offset;
3964 skip_entry:
3965 cd->common.err = nfs_ok;
3966 return 0;
3967 fail:
3968 xdr_truncate_encode(xdr, start_offset);
3969 cd->common.err = nfserr;
3970 return -EINVAL;
3971 }
3972
3973 static __be32
nfsd4_encode_verifier4(struct xdr_stream * xdr,const nfs4_verifier * verf)3974 nfsd4_encode_verifier4(struct xdr_stream *xdr, const nfs4_verifier *verf)
3975 {
3976 __be32 *p;
3977
3978 p = xdr_reserve_space(xdr, NFS4_VERIFIER_SIZE);
3979 if (!p)
3980 return nfserr_resource;
3981 memcpy(p, verf->data, sizeof(verf->data));
3982 return nfs_ok;
3983 }
3984
3985 static __be32
nfsd4_encode_clientid4(struct xdr_stream * xdr,const clientid_t * clientid)3986 nfsd4_encode_clientid4(struct xdr_stream *xdr, const clientid_t *clientid)
3987 {
3988 __be32 *p;
3989
3990 p = xdr_reserve_space(xdr, sizeof(__be64));
3991 if (!p)
3992 return nfserr_resource;
3993 memcpy(p, clientid, sizeof(*clientid));
3994 return nfs_ok;
3995 }
3996
3997 /* This is a frequently-encoded item; open-coded for speed */
3998 static __be32
nfsd4_encode_stateid4(struct xdr_stream * xdr,const stateid_t * sid)3999 nfsd4_encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
4000 {
4001 __be32 *p;
4002
4003 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
4004 if (!p)
4005 return nfserr_resource;
4006 *p++ = cpu_to_be32(sid->si_generation);
4007 memcpy(p, &sid->si_opaque, sizeof(sid->si_opaque));
4008 return nfs_ok;
4009 }
4010
4011 static __be32
nfsd4_encode_sessionid4(struct xdr_stream * xdr,const struct nfs4_sessionid * sessionid)4012 nfsd4_encode_sessionid4(struct xdr_stream *xdr,
4013 const struct nfs4_sessionid *sessionid)
4014 {
4015 return nfsd4_encode_opaque_fixed(xdr, sessionid->data,
4016 NFS4_MAX_SESSIONID_LEN);
4017 }
4018
4019 static __be32
nfsd4_encode_access(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4020 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr,
4021 union nfsd4_op_u *u)
4022 {
4023 struct nfsd4_access *access = &u->access;
4024 struct xdr_stream *xdr = resp->xdr;
4025 __be32 status;
4026
4027 /* supported */
4028 status = nfsd4_encode_uint32_t(xdr, access->ac_supported);
4029 if (status != nfs_ok)
4030 return status;
4031 /* access */
4032 return nfsd4_encode_uint32_t(xdr, access->ac_resp_access);
4033 }
4034
nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4035 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr,
4036 union nfsd4_op_u *u)
4037 {
4038 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
4039 struct xdr_stream *xdr = resp->xdr;
4040
4041 /* bctsr_sessid */
4042 nfserr = nfsd4_encode_sessionid4(xdr, &bcts->sessionid);
4043 if (nfserr != nfs_ok)
4044 return nfserr;
4045 /* bctsr_dir */
4046 if (xdr_stream_encode_u32(xdr, bcts->dir) != XDR_UNIT)
4047 return nfserr_resource;
4048 /* bctsr_use_conn_in_rdma_mode */
4049 return nfsd4_encode_bool(xdr, false);
4050 }
4051
4052 static __be32
nfsd4_encode_close(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4053 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr,
4054 union nfsd4_op_u *u)
4055 {
4056 struct nfsd4_close *close = &u->close;
4057 struct xdr_stream *xdr = resp->xdr;
4058
4059 /* open_stateid */
4060 return nfsd4_encode_stateid4(xdr, &close->cl_stateid);
4061 }
4062
4063
4064 static __be32
nfsd4_encode_commit(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4065 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr,
4066 union nfsd4_op_u *u)
4067 {
4068 struct nfsd4_commit *commit = &u->commit;
4069
4070 return nfsd4_encode_verifier4(resp->xdr, &commit->co_verf);
4071 }
4072
4073 static __be32
nfsd4_encode_create(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4074 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr,
4075 union nfsd4_op_u *u)
4076 {
4077 struct nfsd4_create *create = &u->create;
4078 struct xdr_stream *xdr = resp->xdr;
4079
4080 /* cinfo */
4081 nfserr = nfsd4_encode_change_info4(xdr, &create->cr_cinfo);
4082 if (nfserr)
4083 return nfserr;
4084 /* attrset */
4085 return nfsd4_encode_bitmap4(xdr, create->cr_bmval[0],
4086 create->cr_bmval[1], create->cr_bmval[2]);
4087 }
4088
4089 static __be32
nfsd4_encode_getattr(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4090 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4091 union nfsd4_op_u *u)
4092 {
4093 struct nfsd4_getattr *getattr = &u->getattr;
4094 struct svc_fh *fhp = getattr->ga_fhp;
4095 struct xdr_stream *xdr = resp->xdr;
4096
4097 /* obj_attributes */
4098 return nfsd4_encode_fattr4(resp->rqstp, xdr, fhp, fhp->fh_export,
4099 fhp->fh_dentry, getattr->ga_bmval, 0);
4100 }
4101
4102 static __be32
nfsd4_encode_getfh(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4103 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr,
4104 union nfsd4_op_u *u)
4105 {
4106 struct xdr_stream *xdr = resp->xdr;
4107 struct svc_fh *fhp = u->getfh;
4108
4109 /* object */
4110 return nfsd4_encode_nfs_fh4(xdr, &fhp->fh_handle);
4111 }
4112
4113 static __be32
nfsd4_encode_lock_owner4(struct xdr_stream * xdr,const clientid_t * clientid,const struct xdr_netobj * owner)4114 nfsd4_encode_lock_owner4(struct xdr_stream *xdr, const clientid_t *clientid,
4115 const struct xdr_netobj *owner)
4116 {
4117 __be32 status;
4118
4119 /* clientid */
4120 status = nfsd4_encode_clientid4(xdr, clientid);
4121 if (status != nfs_ok)
4122 return status;
4123 /* owner */
4124 return nfsd4_encode_opaque(xdr, owner->data, owner->len);
4125 }
4126
4127 static __be32
nfsd4_encode_lock4denied(struct xdr_stream * xdr,const struct nfsd4_lock_denied * ld)4128 nfsd4_encode_lock4denied(struct xdr_stream *xdr,
4129 const struct nfsd4_lock_denied *ld)
4130 {
4131 __be32 status;
4132
4133 /* offset */
4134 status = nfsd4_encode_offset4(xdr, ld->ld_start);
4135 if (status != nfs_ok)
4136 return status;
4137 /* length */
4138 status = nfsd4_encode_length4(xdr, ld->ld_length);
4139 if (status != nfs_ok)
4140 return status;
4141 /* locktype */
4142 if (xdr_stream_encode_u32(xdr, ld->ld_type) != XDR_UNIT)
4143 return nfserr_resource;
4144 /* owner */
4145 return nfsd4_encode_lock_owner4(xdr, &ld->ld_clientid,
4146 &ld->ld_owner);
4147 }
4148
4149 static __be32
nfsd4_encode_lock(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4150 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr,
4151 union nfsd4_op_u *u)
4152 {
4153 struct nfsd4_lock *lock = &u->lock;
4154 struct xdr_stream *xdr = resp->xdr;
4155 __be32 status;
4156
4157 switch (nfserr) {
4158 case nfs_ok:
4159 /* resok4 */
4160 status = nfsd4_encode_stateid4(xdr, &lock->lk_resp_stateid);
4161 break;
4162 case nfserr_denied:
4163 /* denied */
4164 status = nfsd4_encode_lock4denied(xdr, &lock->lk_denied);
4165 break;
4166 default:
4167 return nfserr;
4168 }
4169 return status != nfs_ok ? status : nfserr;
4170 }
4171
4172 static __be32
nfsd4_encode_lockt(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4173 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr,
4174 union nfsd4_op_u *u)
4175 {
4176 struct nfsd4_lockt *lockt = &u->lockt;
4177 struct xdr_stream *xdr = resp->xdr;
4178 __be32 status;
4179
4180 if (nfserr == nfserr_denied) {
4181 /* denied */
4182 status = nfsd4_encode_lock4denied(xdr, &lockt->lt_denied);
4183 if (status != nfs_ok)
4184 return status;
4185 }
4186 return nfserr;
4187 }
4188
4189 static __be32
nfsd4_encode_locku(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4190 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr,
4191 union nfsd4_op_u *u)
4192 {
4193 struct nfsd4_locku *locku = &u->locku;
4194 struct xdr_stream *xdr = resp->xdr;
4195
4196 /* lock_stateid */
4197 return nfsd4_encode_stateid4(xdr, &locku->lu_stateid);
4198 }
4199
4200
4201 static __be32
nfsd4_encode_link(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4202 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr,
4203 union nfsd4_op_u *u)
4204 {
4205 struct nfsd4_link *link = &u->link;
4206 struct xdr_stream *xdr = resp->xdr;
4207
4208 return nfsd4_encode_change_info4(xdr, &link->li_cinfo);
4209 }
4210
4211 /*
4212 * This implementation does not yet support returning an ACE in an
4213 * OPEN that offers a delegation.
4214 */
4215 static __be32
nfsd4_encode_open_nfsace4(struct xdr_stream * xdr)4216 nfsd4_encode_open_nfsace4(struct xdr_stream *xdr)
4217 {
4218 __be32 status;
4219
4220 /* type */
4221 status = nfsd4_encode_acetype4(xdr, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
4222 if (status != nfs_ok)
4223 return nfserr_resource;
4224 /* flag */
4225 status = nfsd4_encode_aceflag4(xdr, 0);
4226 if (status != nfs_ok)
4227 return nfserr_resource;
4228 /* access mask */
4229 status = nfsd4_encode_acemask4(xdr, 0);
4230 if (status != nfs_ok)
4231 return nfserr_resource;
4232 /* who - empty for now */
4233 if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
4234 return nfserr_resource;
4235 return nfs_ok;
4236 }
4237
4238 static __be32
nfsd4_encode_open_read_delegation4(struct xdr_stream * xdr,struct nfsd4_open * open)4239 nfsd4_encode_open_read_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4240 {
4241 __be32 status;
4242
4243 /* stateid */
4244 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4245 if (status != nfs_ok)
4246 return status;
4247 /* recall */
4248 status = nfsd4_encode_bool(xdr, open->op_recall);
4249 if (status != nfs_ok)
4250 return status;
4251 /* permissions */
4252 return nfsd4_encode_open_nfsace4(xdr);
4253 }
4254
4255 static __be32
nfsd4_encode_nfs_space_limit4(struct xdr_stream * xdr,u64 filesize)4256 nfsd4_encode_nfs_space_limit4(struct xdr_stream *xdr, u64 filesize)
4257 {
4258 /* limitby */
4259 if (xdr_stream_encode_u32(xdr, NFS4_LIMIT_SIZE) != XDR_UNIT)
4260 return nfserr_resource;
4261 /* filesize */
4262 return nfsd4_encode_uint64_t(xdr, filesize);
4263 }
4264
4265 static __be32
nfsd4_encode_open_write_delegation4(struct xdr_stream * xdr,struct nfsd4_open * open)4266 nfsd4_encode_open_write_delegation4(struct xdr_stream *xdr,
4267 struct nfsd4_open *open)
4268 {
4269 __be32 status;
4270
4271 /* stateid */
4272 status = nfsd4_encode_stateid4(xdr, &open->op_delegate_stateid);
4273 if (status != nfs_ok)
4274 return status;
4275 /* recall */
4276 status = nfsd4_encode_bool(xdr, open->op_recall);
4277 if (status != nfs_ok)
4278 return status;
4279 /* space_limit */
4280 status = nfsd4_encode_nfs_space_limit4(xdr, 0);
4281 if (status != nfs_ok)
4282 return status;
4283 return nfsd4_encode_open_nfsace4(xdr);
4284 }
4285
4286 static __be32
nfsd4_encode_open_none_delegation4(struct xdr_stream * xdr,struct nfsd4_open * open)4287 nfsd4_encode_open_none_delegation4(struct xdr_stream *xdr,
4288 struct nfsd4_open *open)
4289 {
4290 __be32 status = nfs_ok;
4291
4292 /* ond_why */
4293 if (xdr_stream_encode_u32(xdr, open->op_why_no_deleg) != XDR_UNIT)
4294 return nfserr_resource;
4295 switch (open->op_why_no_deleg) {
4296 case WND4_CONTENTION:
4297 /* ond_server_will_push_deleg */
4298 status = nfsd4_encode_bool(xdr, false);
4299 break;
4300 case WND4_RESOURCE:
4301 /* ond_server_will_signal_avail */
4302 status = nfsd4_encode_bool(xdr, false);
4303 }
4304 return status;
4305 }
4306
4307 static __be32
nfsd4_encode_open_delegation4(struct xdr_stream * xdr,struct nfsd4_open * open)4308 nfsd4_encode_open_delegation4(struct xdr_stream *xdr, struct nfsd4_open *open)
4309 {
4310 __be32 status;
4311
4312 /* delegation_type */
4313 if (xdr_stream_encode_u32(xdr, open->op_delegate_type) != XDR_UNIT)
4314 return nfserr_resource;
4315 switch (open->op_delegate_type) {
4316 case OPEN_DELEGATE_NONE:
4317 status = nfs_ok;
4318 break;
4319 case OPEN_DELEGATE_READ:
4320 case OPEN_DELEGATE_READ_ATTRS_DELEG:
4321 /* read */
4322 status = nfsd4_encode_open_read_delegation4(xdr, open);
4323 break;
4324 case OPEN_DELEGATE_WRITE:
4325 case OPEN_DELEGATE_WRITE_ATTRS_DELEG:
4326 /* write */
4327 status = nfsd4_encode_open_write_delegation4(xdr, open);
4328 break;
4329 case OPEN_DELEGATE_NONE_EXT:
4330 /* od_whynone */
4331 status = nfsd4_encode_open_none_delegation4(xdr, open);
4332 break;
4333 default:
4334 status = nfserr_serverfault;
4335 }
4336
4337 return status;
4338 }
4339
4340 static __be32
nfsd4_encode_open(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4341 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr,
4342 union nfsd4_op_u *u)
4343 {
4344 struct nfsd4_open *open = &u->open;
4345 struct xdr_stream *xdr = resp->xdr;
4346
4347 /* stateid */
4348 nfserr = nfsd4_encode_stateid4(xdr, &open->op_stateid);
4349 if (nfserr != nfs_ok)
4350 return nfserr;
4351 /* cinfo */
4352 nfserr = nfsd4_encode_change_info4(xdr, &open->op_cinfo);
4353 if (nfserr != nfs_ok)
4354 return nfserr;
4355 /* rflags */
4356 nfserr = nfsd4_encode_uint32_t(xdr, open->op_rflags);
4357 if (nfserr != nfs_ok)
4358 return nfserr;
4359 /* attrset */
4360 nfserr = nfsd4_encode_bitmap4(xdr, open->op_bmval[0],
4361 open->op_bmval[1], open->op_bmval[2]);
4362 if (nfserr != nfs_ok)
4363 return nfserr;
4364 /* delegation */
4365 return nfsd4_encode_open_delegation4(xdr, open);
4366 }
4367
4368 static __be32
nfsd4_encode_open_confirm(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4369 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr,
4370 union nfsd4_op_u *u)
4371 {
4372 struct nfsd4_open_confirm *oc = &u->open_confirm;
4373 struct xdr_stream *xdr = resp->xdr;
4374
4375 /* open_stateid */
4376 return nfsd4_encode_stateid4(xdr, &oc->oc_resp_stateid);
4377 }
4378
4379 static __be32
nfsd4_encode_open_downgrade(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4380 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr,
4381 union nfsd4_op_u *u)
4382 {
4383 struct nfsd4_open_downgrade *od = &u->open_downgrade;
4384 struct xdr_stream *xdr = resp->xdr;
4385
4386 /* open_stateid */
4387 return nfsd4_encode_stateid4(xdr, &od->od_stateid);
4388 }
4389
4390 /*
4391 * The operation of this function assumes that this is the only
4392 * READ operation in the COMPOUND. If there are multiple READs,
4393 * we use nfsd4_encode_readv().
4394 */
nfsd4_encode_splice_read(struct nfsd4_compoundres * resp,struct nfsd4_read * read,struct file * file,unsigned long maxcount)4395 static __be32 nfsd4_encode_splice_read(
4396 struct nfsd4_compoundres *resp,
4397 struct nfsd4_read *read,
4398 struct file *file, unsigned long maxcount)
4399 {
4400 struct xdr_stream *xdr = resp->xdr;
4401 struct xdr_buf *buf = xdr->buf;
4402 int status, space_left;
4403 __be32 nfserr;
4404
4405 /*
4406 * Splice read doesn't work if encoding has already wandered
4407 * into the XDR buf's page array.
4408 */
4409 if (unlikely(xdr->buf->page_len)) {
4410 WARN_ON_ONCE(1);
4411 return nfserr_serverfault;
4412 }
4413
4414 /*
4415 * Make sure there is room at the end of buf->head for
4416 * svcxdr_encode_opaque_pages() to create a tail buffer
4417 * to XDR-pad the payload.
4418 */
4419 if (xdr->iov != xdr->buf->head || xdr->end - xdr->p < 1)
4420 return nfserr_resource;
4421
4422 nfserr = nfsd_splice_read(read->rd_rqstp, read->rd_fhp,
4423 file, read->rd_offset, &maxcount,
4424 &read->rd_eof);
4425 read->rd_length = maxcount;
4426 if (nfserr)
4427 goto out_err;
4428 svcxdr_encode_opaque_pages(read->rd_rqstp, xdr, buf->pages,
4429 buf->page_base, maxcount);
4430 status = svc_encode_result_payload(read->rd_rqstp,
4431 buf->head[0].iov_len, maxcount);
4432 if (status) {
4433 nfserr = nfserrno(status);
4434 goto out_err;
4435 }
4436
4437 /*
4438 * Prepare to encode subsequent operations.
4439 *
4440 * xdr_truncate_encode() is not safe to use after a successful
4441 * splice read has been done, so the following stream
4442 * manipulations are open-coded.
4443 */
4444 space_left = min_t(int, (void *)xdr->end - (void *)xdr->p,
4445 buf->buflen - buf->len);
4446 buf->buflen = buf->len + space_left;
4447 xdr->end = (__be32 *)((void *)xdr->end + space_left);
4448
4449 return nfs_ok;
4450
4451 out_err:
4452 /*
4453 * nfsd_splice_actor may have already messed with the
4454 * page length; reset it so as not to confuse
4455 * xdr_truncate_encode in our caller.
4456 */
4457 buf->page_len = 0;
4458 return nfserr;
4459 }
4460
nfsd4_encode_readv(struct nfsd4_compoundres * resp,struct nfsd4_read * read,struct file * file,unsigned long maxcount)4461 static __be32 nfsd4_encode_readv(struct nfsd4_compoundres *resp,
4462 struct nfsd4_read *read,
4463 struct file *file, unsigned long maxcount)
4464 {
4465 struct xdr_stream *xdr = resp->xdr;
4466 unsigned int base = xdr->buf->page_len & ~PAGE_MASK;
4467 unsigned int starting_len = xdr->buf->len;
4468 __be32 zero = xdr_zero;
4469 __be32 nfserr;
4470
4471 if (xdr_reserve_space_vec(xdr, maxcount) < 0)
4472 return nfserr_resource;
4473
4474 nfserr = nfsd_iter_read(resp->rqstp, read->rd_fhp, file,
4475 read->rd_offset, &maxcount, base,
4476 &read->rd_eof);
4477 read->rd_length = maxcount;
4478 if (nfserr)
4479 return nfserr;
4480 if (svc_encode_result_payload(resp->rqstp, starting_len, maxcount))
4481 return nfserr_io;
4482 xdr_truncate_encode(xdr, starting_len + xdr_align_size(maxcount));
4483
4484 write_bytes_to_xdr_buf(xdr->buf, starting_len + maxcount, &zero,
4485 xdr_pad_size(maxcount));
4486 return nfs_ok;
4487 }
4488
4489 static __be32
nfsd4_encode_read(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4490 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
4491 union nfsd4_op_u *u)
4492 {
4493 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
4494 struct nfsd4_read *read = &u->read;
4495 struct xdr_stream *xdr = resp->xdr;
4496 bool splice_ok = argp->splice_ok;
4497 unsigned int eof_offset;
4498 unsigned long maxcount;
4499 __be32 wire_data[2];
4500 struct file *file;
4501
4502 if (nfserr)
4503 return nfserr;
4504
4505 eof_offset = xdr->buf->len;
4506 file = read->rd_nf->nf_file;
4507
4508 /* Reserve space for the eof flag and byte count */
4509 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT * 2))) {
4510 WARN_ON_ONCE(splice_ok);
4511 return nfserr_resource;
4512 }
4513 xdr_commit_encode(xdr);
4514
4515 maxcount = min_t(unsigned long, read->rd_length,
4516 (xdr->buf->buflen - xdr->buf->len));
4517
4518 if (file->f_op->splice_read && splice_ok)
4519 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
4520 else
4521 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
4522 if (nfserr) {
4523 xdr_truncate_encode(xdr, eof_offset);
4524 return nfserr;
4525 }
4526
4527 wire_data[0] = read->rd_eof ? xdr_one : xdr_zero;
4528 wire_data[1] = cpu_to_be32(read->rd_length);
4529 write_bytes_to_xdr_buf(xdr->buf, eof_offset, &wire_data, XDR_UNIT * 2);
4530 return nfs_ok;
4531 }
4532
4533 static __be32
nfsd4_encode_readlink(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4534 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr,
4535 union nfsd4_op_u *u)
4536 {
4537 struct nfsd4_readlink *readlink = &u->readlink;
4538 __be32 *p, wire_count, zero = xdr_zero;
4539 struct xdr_stream *xdr = resp->xdr;
4540 unsigned int length_offset;
4541 int maxcount, status;
4542
4543 /* linktext4.count */
4544 length_offset = xdr->buf->len;
4545 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT)))
4546 return nfserr_resource;
4547
4548 /* linktext4.data */
4549 maxcount = PAGE_SIZE;
4550 p = xdr_reserve_space(xdr, maxcount);
4551 if (!p)
4552 return nfserr_resource;
4553 nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
4554 (char *)p, &maxcount);
4555 if (nfserr == nfserr_isdir)
4556 nfserr = nfserr_inval;
4557 if (nfserr)
4558 goto out_err;
4559 status = svc_encode_result_payload(readlink->rl_rqstp, length_offset,
4560 maxcount);
4561 if (status) {
4562 nfserr = nfserrno(status);
4563 goto out_err;
4564 }
4565
4566 wire_count = cpu_to_be32(maxcount);
4567 write_bytes_to_xdr_buf(xdr->buf, length_offset, &wire_count, XDR_UNIT);
4568 xdr_truncate_encode(xdr, length_offset + 4 + xdr_align_size(maxcount));
4569 write_bytes_to_xdr_buf(xdr->buf, length_offset + 4 + maxcount, &zero,
4570 xdr_pad_size(maxcount));
4571 return nfs_ok;
4572
4573 out_err:
4574 xdr_truncate_encode(xdr, length_offset);
4575 return nfserr;
4576 }
4577
nfsd4_encode_dirlist4(struct xdr_stream * xdr,struct nfsd4_readdir * readdir,u32 max_payload)4578 static __be32 nfsd4_encode_dirlist4(struct xdr_stream *xdr,
4579 struct nfsd4_readdir *readdir,
4580 u32 max_payload)
4581 {
4582 int bytes_left, maxcount, starting_len = xdr->buf->len;
4583 loff_t offset;
4584 __be32 status;
4585
4586 /*
4587 * Number of bytes left for directory entries allowing for the
4588 * final 8 bytes of the readdir and a following failed op.
4589 */
4590 bytes_left = xdr->buf->buflen - xdr->buf->len -
4591 COMPOUND_ERR_SLACK_SPACE - XDR_UNIT * 2;
4592 if (bytes_left < 0)
4593 return nfserr_resource;
4594 maxcount = min_t(u32, readdir->rd_maxcount, max_payload);
4595
4596 /*
4597 * The RFC defines rd_maxcount as the size of the
4598 * READDIR4resok structure, which includes the verifier
4599 * and the 8 bytes encoded at the end of this function.
4600 */
4601 if (maxcount < XDR_UNIT * 4)
4602 return nfserr_toosmall;
4603 maxcount = min_t(int, maxcount - XDR_UNIT * 4, bytes_left);
4604
4605 /* RFC 3530 14.2.24 allows us to ignore dircount when it's 0 */
4606 if (!readdir->rd_dircount)
4607 readdir->rd_dircount = max_payload;
4608
4609 /* *entries */
4610 readdir->xdr = xdr;
4611 readdir->rd_maxcount = maxcount;
4612 readdir->common.err = 0;
4613 readdir->cookie_offset = 0;
4614 offset = readdir->rd_cookie;
4615 status = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp, &offset,
4616 &readdir->common, nfsd4_encode_entry4);
4617 if (status)
4618 return status;
4619 if (readdir->common.err == nfserr_toosmall &&
4620 xdr->buf->len == starting_len) {
4621 /* No entries were encoded. Which limit did we hit? */
4622 if (maxcount - XDR_UNIT * 4 < bytes_left)
4623 /* It was the fault of rd_maxcount */
4624 return nfserr_toosmall;
4625 /* We ran out of buffer space */
4626 return nfserr_resource;
4627 }
4628 /* Encode the final entry's cookie value */
4629 nfsd4_encode_entry4_nfs_cookie4(readdir, offset);
4630 /* No entries follow */
4631 if (xdr_stream_encode_item_absent(xdr) != XDR_UNIT)
4632 return nfserr_resource;
4633
4634 /* eof */
4635 return nfsd4_encode_bool(xdr, readdir->common.err == nfserr_eof);
4636 }
4637
4638 static __be32
nfsd4_encode_readdir(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4639 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr,
4640 union nfsd4_op_u *u)
4641 {
4642 struct nfsd4_readdir *readdir = &u->readdir;
4643 struct xdr_stream *xdr = resp->xdr;
4644 int starting_len = xdr->buf->len;
4645
4646 /* cookieverf */
4647 nfserr = nfsd4_encode_verifier4(xdr, &readdir->rd_verf);
4648 if (nfserr != nfs_ok)
4649 return nfserr;
4650
4651 /* reply */
4652 nfserr = nfsd4_encode_dirlist4(xdr, readdir, svc_max_payload(resp->rqstp));
4653 if (nfserr != nfs_ok)
4654 xdr_truncate_encode(xdr, starting_len);
4655 return nfserr;
4656 }
4657
4658 static __be32
nfsd4_encode_remove(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4659 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr,
4660 union nfsd4_op_u *u)
4661 {
4662 struct nfsd4_remove *remove = &u->remove;
4663 struct xdr_stream *xdr = resp->xdr;
4664
4665 return nfsd4_encode_change_info4(xdr, &remove->rm_cinfo);
4666 }
4667
4668 static __be32
nfsd4_encode_rename(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4669 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr,
4670 union nfsd4_op_u *u)
4671 {
4672 struct nfsd4_rename *rename = &u->rename;
4673 struct xdr_stream *xdr = resp->xdr;
4674
4675 nfserr = nfsd4_encode_change_info4(xdr, &rename->rn_sinfo);
4676 if (nfserr)
4677 return nfserr;
4678 return nfsd4_encode_change_info4(xdr, &rename->rn_tinfo);
4679 }
4680
4681 static __be32
nfsd4_encode_rpcsec_gss_info(struct xdr_stream * xdr,struct rpcsec_gss_info * info)4682 nfsd4_encode_rpcsec_gss_info(struct xdr_stream *xdr,
4683 struct rpcsec_gss_info *info)
4684 {
4685 __be32 status;
4686
4687 /* oid */
4688 if (xdr_stream_encode_opaque(xdr, info->oid.data, info->oid.len) < 0)
4689 return nfserr_resource;
4690 /* qop */
4691 status = nfsd4_encode_qop4(xdr, info->qop);
4692 if (status != nfs_ok)
4693 return status;
4694 /* service */
4695 if (xdr_stream_encode_u32(xdr, info->service) != XDR_UNIT)
4696 return nfserr_resource;
4697
4698 return nfs_ok;
4699 }
4700
4701 static __be32
nfsd4_encode_secinfo4(struct xdr_stream * xdr,rpc_authflavor_t pf,u32 * supported)4702 nfsd4_encode_secinfo4(struct xdr_stream *xdr, rpc_authflavor_t pf,
4703 u32 *supported)
4704 {
4705 struct rpcsec_gss_info info;
4706 __be32 status;
4707
4708 if (rpcauth_get_gssinfo(pf, &info) == 0) {
4709 (*supported)++;
4710
4711 /* flavor */
4712 status = nfsd4_encode_uint32_t(xdr, RPC_AUTH_GSS);
4713 if (status != nfs_ok)
4714 return status;
4715 /* flavor_info */
4716 status = nfsd4_encode_rpcsec_gss_info(xdr, &info);
4717 if (status != nfs_ok)
4718 return status;
4719 } else if (pf < RPC_AUTH_MAXFLAVOR) {
4720 (*supported)++;
4721
4722 /* flavor */
4723 status = nfsd4_encode_uint32_t(xdr, pf);
4724 if (status != nfs_ok)
4725 return status;
4726 }
4727 return nfs_ok;
4728 }
4729
4730 static __be32
nfsd4_encode_SECINFO4resok(struct xdr_stream * xdr,struct svc_export * exp)4731 nfsd4_encode_SECINFO4resok(struct xdr_stream *xdr, struct svc_export *exp)
4732 {
4733 u32 i, nflavs, supported;
4734 struct exp_flavor_info *flavs;
4735 struct exp_flavor_info def_flavs[2];
4736 unsigned int count_offset;
4737 __be32 status, wire_count;
4738
4739 if (exp->ex_nflavors) {
4740 flavs = exp->ex_flavors;
4741 nflavs = exp->ex_nflavors;
4742 } else { /* Handling of some defaults in absence of real secinfo: */
4743 flavs = def_flavs;
4744 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
4745 nflavs = 2;
4746 flavs[0].pseudoflavor = RPC_AUTH_UNIX;
4747 flavs[1].pseudoflavor = RPC_AUTH_NULL;
4748 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
4749 nflavs = 1;
4750 flavs[0].pseudoflavor
4751 = svcauth_gss_flavor(exp->ex_client);
4752 } else {
4753 nflavs = 1;
4754 flavs[0].pseudoflavor
4755 = exp->ex_client->flavour->flavour;
4756 }
4757 }
4758
4759 count_offset = xdr->buf->len;
4760 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT)))
4761 return nfserr_resource;
4762
4763 for (i = 0, supported = 0; i < nflavs; i++) {
4764 status = nfsd4_encode_secinfo4(xdr, flavs[i].pseudoflavor,
4765 &supported);
4766 if (status != nfs_ok)
4767 return status;
4768 }
4769
4770 wire_count = cpu_to_be32(supported);
4771 write_bytes_to_xdr_buf(xdr->buf, count_offset, &wire_count,
4772 XDR_UNIT);
4773 return 0;
4774 }
4775
4776 static __be32
nfsd4_encode_secinfo(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4777 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
4778 union nfsd4_op_u *u)
4779 {
4780 struct nfsd4_secinfo *secinfo = &u->secinfo;
4781 struct xdr_stream *xdr = resp->xdr;
4782
4783 return nfsd4_encode_SECINFO4resok(xdr, secinfo->si_exp);
4784 }
4785
4786 static __be32
nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4787 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
4788 union nfsd4_op_u *u)
4789 {
4790 struct nfsd4_secinfo_no_name *secinfo = &u->secinfo_no_name;
4791 struct xdr_stream *xdr = resp->xdr;
4792
4793 return nfsd4_encode_SECINFO4resok(xdr, secinfo->sin_exp);
4794 }
4795
4796 static __be32
nfsd4_encode_setattr(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4797 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr,
4798 union nfsd4_op_u *u)
4799 {
4800 struct nfsd4_setattr *setattr = &u->setattr;
4801 __be32 status;
4802
4803 switch (nfserr) {
4804 case nfs_ok:
4805 /* attrsset */
4806 status = nfsd4_encode_bitmap4(resp->xdr, setattr->sa_bmval[0],
4807 setattr->sa_bmval[1],
4808 setattr->sa_bmval[2]);
4809 break;
4810 default:
4811 /* attrsset */
4812 status = nfsd4_encode_bitmap4(resp->xdr, 0, 0, 0);
4813 }
4814 return status != nfs_ok ? status : nfserr;
4815 }
4816
4817 static __be32
nfsd4_encode_setclientid(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4818 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr,
4819 union nfsd4_op_u *u)
4820 {
4821 struct nfsd4_setclientid *scd = &u->setclientid;
4822 struct xdr_stream *xdr = resp->xdr;
4823
4824 if (!nfserr) {
4825 nfserr = nfsd4_encode_clientid4(xdr, &scd->se_clientid);
4826 if (nfserr != nfs_ok)
4827 goto out;
4828 nfserr = nfsd4_encode_verifier4(xdr, &scd->se_confirm);
4829 } else if (nfserr == nfserr_clid_inuse) {
4830 /* empty network id */
4831 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4832 nfserr = nfserr_resource;
4833 goto out;
4834 }
4835 /* empty universal address */
4836 if (xdr_stream_encode_u32(xdr, 0) < 0) {
4837 nfserr = nfserr_resource;
4838 goto out;
4839 }
4840 }
4841 out:
4842 return nfserr;
4843 }
4844
4845 static __be32
nfsd4_encode_write(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4846 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr,
4847 union nfsd4_op_u *u)
4848 {
4849 struct nfsd4_write *write = &u->write;
4850 struct xdr_stream *xdr = resp->xdr;
4851
4852 /* count */
4853 nfserr = nfsd4_encode_count4(xdr, write->wr_bytes_written);
4854 if (nfserr)
4855 return nfserr;
4856 /* committed */
4857 if (xdr_stream_encode_u32(xdr, write->wr_how_written) != XDR_UNIT)
4858 return nfserr_resource;
4859 /* writeverf */
4860 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
4861 }
4862
4863 static __be32
nfsd4_encode_state_protect_ops4(struct xdr_stream * xdr,struct nfsd4_exchange_id * exid)4864 nfsd4_encode_state_protect_ops4(struct xdr_stream *xdr,
4865 struct nfsd4_exchange_id *exid)
4866 {
4867 __be32 status;
4868
4869 /* spo_must_enforce */
4870 status = nfsd4_encode_bitmap4(xdr, exid->spo_must_enforce[0],
4871 exid->spo_must_enforce[1],
4872 exid->spo_must_enforce[2]);
4873 if (status != nfs_ok)
4874 return status;
4875 /* spo_must_allow */
4876 return nfsd4_encode_bitmap4(xdr, exid->spo_must_allow[0],
4877 exid->spo_must_allow[1],
4878 exid->spo_must_allow[2]);
4879 }
4880
4881 static __be32
nfsd4_encode_state_protect4_r(struct xdr_stream * xdr,struct nfsd4_exchange_id * exid)4882 nfsd4_encode_state_protect4_r(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4883 {
4884 __be32 status;
4885
4886 if (xdr_stream_encode_u32(xdr, exid->spa_how) != XDR_UNIT)
4887 return nfserr_resource;
4888 switch (exid->spa_how) {
4889 case SP4_NONE:
4890 status = nfs_ok;
4891 break;
4892 case SP4_MACH_CRED:
4893 /* spr_mach_ops */
4894 status = nfsd4_encode_state_protect_ops4(xdr, exid);
4895 break;
4896 default:
4897 status = nfserr_serverfault;
4898 }
4899 return status;
4900 }
4901
4902 static __be32
nfsd4_encode_server_owner4(struct xdr_stream * xdr,struct svc_rqst * rqstp)4903 nfsd4_encode_server_owner4(struct xdr_stream *xdr, struct svc_rqst *rqstp)
4904 {
4905 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4906 __be32 status;
4907
4908 /* so_minor_id */
4909 status = nfsd4_encode_uint64_t(xdr, 0);
4910 if (status != nfs_ok)
4911 return status;
4912 /* so_major_id */
4913 return nfsd4_encode_opaque(xdr, nn->nfsd_name, strlen(nn->nfsd_name));
4914 }
4915
4916 static __be32
nfsd4_encode_nfs_impl_id4(struct xdr_stream * xdr,struct nfsd4_exchange_id * exid)4917 nfsd4_encode_nfs_impl_id4(struct xdr_stream *xdr, struct nfsd4_exchange_id *exid)
4918 {
4919 __be32 status;
4920
4921 /* nii_domain */
4922 status = nfsd4_encode_opaque(xdr, exid->nii_domain.data,
4923 exid->nii_domain.len);
4924 if (status != nfs_ok)
4925 return status;
4926 /* nii_name */
4927 status = nfsd4_encode_opaque(xdr, exid->nii_name.data,
4928 exid->nii_name.len);
4929 if (status != nfs_ok)
4930 return status;
4931 /* nii_time */
4932 return nfsd4_encode_nfstime4(xdr, &exid->nii_time);
4933 }
4934
4935 static __be32
nfsd4_encode_exchange_id(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)4936 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
4937 union nfsd4_op_u *u)
4938 {
4939 struct nfsd_net *nn = net_generic(SVC_NET(resp->rqstp), nfsd_net_id);
4940 struct nfsd4_exchange_id *exid = &u->exchange_id;
4941 struct xdr_stream *xdr = resp->xdr;
4942
4943 /* eir_clientid */
4944 nfserr = nfsd4_encode_clientid4(xdr, &exid->clientid);
4945 if (nfserr != nfs_ok)
4946 return nfserr;
4947 /* eir_sequenceid */
4948 nfserr = nfsd4_encode_sequenceid4(xdr, exid->seqid);
4949 if (nfserr != nfs_ok)
4950 return nfserr;
4951 /* eir_flags */
4952 nfserr = nfsd4_encode_uint32_t(xdr, exid->flags);
4953 if (nfserr != nfs_ok)
4954 return nfserr;
4955 /* eir_state_protect */
4956 nfserr = nfsd4_encode_state_protect4_r(xdr, exid);
4957 if (nfserr != nfs_ok)
4958 return nfserr;
4959 /* eir_server_owner */
4960 nfserr = nfsd4_encode_server_owner4(xdr, resp->rqstp);
4961 if (nfserr != nfs_ok)
4962 return nfserr;
4963 /* eir_server_scope */
4964 nfserr = nfsd4_encode_opaque(xdr, nn->nfsd_name,
4965 strlen(nn->nfsd_name));
4966 if (nfserr != nfs_ok)
4967 return nfserr;
4968 /* eir_server_impl_id<1> */
4969 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
4970 return nfserr_resource;
4971 nfserr = nfsd4_encode_nfs_impl_id4(xdr, exid);
4972 if (nfserr != nfs_ok)
4973 return nfserr;
4974
4975 return nfs_ok;
4976 }
4977
4978 static __be32
nfsd4_encode_channel_attrs4(struct xdr_stream * xdr,const struct nfsd4_channel_attrs * attrs)4979 nfsd4_encode_channel_attrs4(struct xdr_stream *xdr,
4980 const struct nfsd4_channel_attrs *attrs)
4981 {
4982 __be32 status;
4983
4984 /* ca_headerpadsize */
4985 status = nfsd4_encode_count4(xdr, 0);
4986 if (status != nfs_ok)
4987 return status;
4988 /* ca_maxrequestsize */
4989 status = nfsd4_encode_count4(xdr, attrs->maxreq_sz);
4990 if (status != nfs_ok)
4991 return status;
4992 /* ca_maxresponsesize */
4993 status = nfsd4_encode_count4(xdr, attrs->maxresp_sz);
4994 if (status != nfs_ok)
4995 return status;
4996 /* ca_maxresponsesize_cached */
4997 status = nfsd4_encode_count4(xdr, attrs->maxresp_cached);
4998 if (status != nfs_ok)
4999 return status;
5000 /* ca_maxoperations */
5001 status = nfsd4_encode_count4(xdr, attrs->maxops);
5002 if (status != nfs_ok)
5003 return status;
5004 /* ca_maxrequests */
5005 status = nfsd4_encode_count4(xdr, attrs->maxreqs);
5006 if (status != nfs_ok)
5007 return status;
5008 /* ca_rdma_ird<1> */
5009 if (xdr_stream_encode_u32(xdr, attrs->nr_rdma_attrs) != XDR_UNIT)
5010 return nfserr_resource;
5011 if (attrs->nr_rdma_attrs)
5012 return nfsd4_encode_uint32_t(xdr, attrs->rdma_attrs);
5013 return nfs_ok;
5014 }
5015
5016 static __be32
nfsd4_encode_create_session(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5017 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
5018 union nfsd4_op_u *u)
5019 {
5020 struct nfsd4_create_session *sess = &u->create_session;
5021 struct xdr_stream *xdr = resp->xdr;
5022
5023 /* csr_sessionid */
5024 nfserr = nfsd4_encode_sessionid4(xdr, &sess->sessionid);
5025 if (nfserr != nfs_ok)
5026 return nfserr;
5027 /* csr_sequence */
5028 nfserr = nfsd4_encode_sequenceid4(xdr, sess->seqid);
5029 if (nfserr != nfs_ok)
5030 return nfserr;
5031 /* csr_flags */
5032 nfserr = nfsd4_encode_uint32_t(xdr, sess->flags);
5033 if (nfserr != nfs_ok)
5034 return nfserr;
5035 /* csr_fore_chan_attrs */
5036 nfserr = nfsd4_encode_channel_attrs4(xdr, &sess->fore_channel);
5037 if (nfserr != nfs_ok)
5038 return nfserr;
5039 /* csr_back_chan_attrs */
5040 return nfsd4_encode_channel_attrs4(xdr, &sess->back_channel);
5041 }
5042
5043 static __be32
nfsd4_encode_sequence(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5044 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
5045 union nfsd4_op_u *u)
5046 {
5047 struct nfsd4_sequence *seq = &u->sequence;
5048 struct xdr_stream *xdr = resp->xdr;
5049
5050 /* sr_sessionid */
5051 nfserr = nfsd4_encode_sessionid4(xdr, &seq->sessionid);
5052 if (nfserr != nfs_ok)
5053 return nfserr;
5054 /* sr_sequenceid */
5055 nfserr = nfsd4_encode_sequenceid4(xdr, seq->seqid);
5056 if (nfserr != nfs_ok)
5057 return nfserr;
5058 /* sr_slotid */
5059 nfserr = nfsd4_encode_slotid4(xdr, seq->slotid);
5060 if (nfserr != nfs_ok)
5061 return nfserr;
5062 /* Note slotid's are numbered from zero: */
5063 /* sr_highest_slotid */
5064 nfserr = nfsd4_encode_slotid4(xdr, seq->maxslots - 1);
5065 if (nfserr != nfs_ok)
5066 return nfserr;
5067 /* sr_target_highest_slotid */
5068 nfserr = nfsd4_encode_slotid4(xdr, seq->target_maxslots - 1);
5069 if (nfserr != nfs_ok)
5070 return nfserr;
5071 /* sr_status_flags */
5072 nfserr = nfsd4_encode_uint32_t(xdr, seq->status_flags);
5073 if (nfserr != nfs_ok)
5074 return nfserr;
5075
5076 resp->cstate.data_offset = xdr->buf->len; /* DRC cache data pointer */
5077 return nfs_ok;
5078 }
5079
5080 static __be32
nfsd4_encode_test_stateid(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5081 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
5082 union nfsd4_op_u *u)
5083 {
5084 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5085 struct nfsd4_test_stateid_id *stateid, *next;
5086 struct xdr_stream *xdr = resp->xdr;
5087
5088 /* tsr_status_codes<> */
5089 if (xdr_stream_encode_u32(xdr, test_stateid->ts_num_ids) != XDR_UNIT)
5090 return nfserr_resource;
5091 list_for_each_entry_safe(stateid, next,
5092 &test_stateid->ts_stateid_list, ts_id_list) {
5093 if (xdr_stream_encode_be32(xdr, stateid->ts_id_status) != XDR_UNIT)
5094 return nfserr_resource;
5095 }
5096 return nfs_ok;
5097 }
5098
5099 static __be32
nfsd4_encode_get_dir_delegation(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5100 nfsd4_encode_get_dir_delegation(struct nfsd4_compoundres *resp, __be32 nfserr,
5101 union nfsd4_op_u *u)
5102 {
5103 struct nfsd4_get_dir_delegation *gdd = &u->get_dir_delegation;
5104 struct xdr_stream *xdr = resp->xdr;
5105 __be32 status = nfserr_resource;
5106
5107 switch(gdd->gddrnf_status) {
5108 case GDD4_OK:
5109 if (xdr_stream_encode_u32(xdr, GDD4_OK) != XDR_UNIT)
5110 break;
5111 status = nfsd4_encode_verifier4(xdr, &gdd->gddr_cookieverf);
5112 if (status)
5113 break;
5114 status = nfsd4_encode_stateid4(xdr, &gdd->gddr_stateid);
5115 if (status)
5116 break;
5117 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_notification[0], 0, 0);
5118 if (status)
5119 break;
5120 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_child_attributes[0],
5121 gdd->gddr_child_attributes[1],
5122 gdd->gddr_child_attributes[2]);
5123 if (status)
5124 break;
5125 status = nfsd4_encode_bitmap4(xdr, gdd->gddr_dir_attributes[0],
5126 gdd->gddr_dir_attributes[1],
5127 gdd->gddr_dir_attributes[2]);
5128 break;
5129 default:
5130 pr_warn("nfsd: bad gddrnf_status (%u)\n", gdd->gddrnf_status);
5131 gdd->gddrnf_will_signal_deleg_avail = 0;
5132 fallthrough;
5133 case GDD4_UNAVAIL:
5134 if (xdr_stream_encode_u32(xdr, GDD4_UNAVAIL) != XDR_UNIT)
5135 break;
5136 status = nfsd4_encode_bool(xdr, gdd->gddrnf_will_signal_deleg_avail);
5137 break;
5138 }
5139 return status;
5140 }
5141
5142 #ifdef CONFIG_NFSD_PNFS
5143 static __be32
nfsd4_encode_device_addr4(struct xdr_stream * xdr,const struct nfsd4_getdeviceinfo * gdev)5144 nfsd4_encode_device_addr4(struct xdr_stream *xdr,
5145 const struct nfsd4_getdeviceinfo *gdev)
5146 {
5147 u32 needed_len, starting_len = xdr->buf->len;
5148 const struct nfsd4_layout_ops *ops;
5149 __be32 status;
5150
5151 /* da_layout_type */
5152 if (xdr_stream_encode_u32(xdr, gdev->gd_layout_type) != XDR_UNIT)
5153 return nfserr_resource;
5154 /* da_addr_body */
5155 ops = nfsd4_layout_ops[gdev->gd_layout_type];
5156 status = ops->encode_getdeviceinfo(xdr, gdev);
5157 if (status != nfs_ok) {
5158 /*
5159 * Don't burden the layout drivers with enforcing
5160 * gd_maxcount. Just tell the client to come back
5161 * with a bigger buffer if it's not enough.
5162 */
5163 if (xdr->buf->len + XDR_UNIT > gdev->gd_maxcount)
5164 goto toosmall;
5165 return status;
5166 }
5167
5168 return nfs_ok;
5169
5170 toosmall:
5171 needed_len = xdr->buf->len + XDR_UNIT; /* notifications */
5172 xdr_truncate_encode(xdr, starting_len);
5173
5174 status = nfsd4_encode_count4(xdr, needed_len);
5175 if (status != nfs_ok)
5176 return status;
5177 return nfserr_toosmall;
5178 }
5179
5180 static __be32
nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5181 nfsd4_encode_getdeviceinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
5182 union nfsd4_op_u *u)
5183 {
5184 struct nfsd4_getdeviceinfo *gdev = &u->getdeviceinfo;
5185 struct xdr_stream *xdr = resp->xdr;
5186
5187 /* gdir_device_addr */
5188 nfserr = nfsd4_encode_device_addr4(xdr, gdev);
5189 if (nfserr)
5190 return nfserr;
5191 /* gdir_notification */
5192 return nfsd4_encode_bitmap4(xdr, gdev->gd_notify_types, 0, 0);
5193 }
5194
5195 static __be32
nfsd4_encode_layout4(struct xdr_stream * xdr,const struct nfsd4_layoutget * lgp)5196 nfsd4_encode_layout4(struct xdr_stream *xdr, const struct nfsd4_layoutget *lgp)
5197 {
5198 const struct nfsd4_layout_ops *ops = nfsd4_layout_ops[lgp->lg_layout_type];
5199 __be32 status;
5200
5201 /* lo_offset */
5202 status = nfsd4_encode_offset4(xdr, lgp->lg_seg.offset);
5203 if (status != nfs_ok)
5204 return status;
5205 /* lo_length */
5206 status = nfsd4_encode_length4(xdr, lgp->lg_seg.length);
5207 if (status != nfs_ok)
5208 return status;
5209 /* lo_iomode */
5210 if (xdr_stream_encode_u32(xdr, lgp->lg_seg.iomode) != XDR_UNIT)
5211 return nfserr_resource;
5212 /* lo_content */
5213 if (xdr_stream_encode_u32(xdr, lgp->lg_layout_type) != XDR_UNIT)
5214 return nfserr_resource;
5215 return ops->encode_layoutget(xdr, lgp);
5216 }
5217
5218 static __be32
nfsd4_encode_layoutget(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5219 nfsd4_encode_layoutget(struct nfsd4_compoundres *resp, __be32 nfserr,
5220 union nfsd4_op_u *u)
5221 {
5222 struct nfsd4_layoutget *lgp = &u->layoutget;
5223 struct xdr_stream *xdr = resp->xdr;
5224
5225 /* logr_return_on_close */
5226 nfserr = nfsd4_encode_bool(xdr, true);
5227 if (nfserr != nfs_ok)
5228 return nfserr;
5229 /* logr_stateid */
5230 nfserr = nfsd4_encode_stateid4(xdr, &lgp->lg_sid);
5231 if (nfserr != nfs_ok)
5232 return nfserr;
5233 /* logr_layout<> */
5234 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5235 return nfserr_resource;
5236 return nfsd4_encode_layout4(xdr, lgp);
5237 }
5238
5239 static __be32
nfsd4_encode_layoutcommit(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5240 nfsd4_encode_layoutcommit(struct nfsd4_compoundres *resp, __be32 nfserr,
5241 union nfsd4_op_u *u)
5242 {
5243 struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
5244 struct xdr_stream *xdr = resp->xdr;
5245
5246 /* ns_sizechanged */
5247 nfserr = nfsd4_encode_bool(xdr, lcp->lc_size_chg);
5248 if (nfserr != nfs_ok)
5249 return nfserr;
5250 if (lcp->lc_size_chg)
5251 /* ns_size */
5252 return nfsd4_encode_length4(xdr, lcp->lc_newsize);
5253 return nfs_ok;
5254 }
5255
5256 static __be32
nfsd4_encode_layoutreturn(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5257 nfsd4_encode_layoutreturn(struct nfsd4_compoundres *resp, __be32 nfserr,
5258 union nfsd4_op_u *u)
5259 {
5260 struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
5261 struct xdr_stream *xdr = resp->xdr;
5262
5263 /* lrs_present */
5264 nfserr = nfsd4_encode_bool(xdr, lrp->lrs_present);
5265 if (nfserr != nfs_ok)
5266 return nfserr;
5267 if (lrp->lrs_present)
5268 /* lrs_stateid */
5269 return nfsd4_encode_stateid4(xdr, &lrp->lr_sid);
5270 return nfs_ok;
5271 }
5272 #endif /* CONFIG_NFSD_PNFS */
5273
5274 static __be32
nfsd4_encode_write_response4(struct xdr_stream * xdr,const struct nfsd4_copy * copy)5275 nfsd4_encode_write_response4(struct xdr_stream *xdr,
5276 const struct nfsd4_copy *copy)
5277 {
5278 const struct nfsd42_write_res *write = ©->cp_res;
5279 u32 count = nfsd4_copy_is_sync(copy) ? 0 : 1;
5280 __be32 status;
5281
5282 /* wr_callback_id<1> */
5283 if (xdr_stream_encode_u32(xdr, count) != XDR_UNIT)
5284 return nfserr_resource;
5285 if (count) {
5286 status = nfsd4_encode_stateid4(xdr, &write->cb_stateid);
5287 if (status != nfs_ok)
5288 return status;
5289 }
5290
5291 /* wr_count */
5292 status = nfsd4_encode_length4(xdr, write->wr_bytes_written);
5293 if (status != nfs_ok)
5294 return status;
5295 /* wr_committed */
5296 if (xdr_stream_encode_u32(xdr, write->wr_stable_how) != XDR_UNIT)
5297 return nfserr_resource;
5298 /* wr_writeverf */
5299 return nfsd4_encode_verifier4(xdr, &write->wr_verifier);
5300 }
5301
nfsd4_encode_copy_requirements4(struct xdr_stream * xdr,const struct nfsd4_copy * copy)5302 static __be32 nfsd4_encode_copy_requirements4(struct xdr_stream *xdr,
5303 const struct nfsd4_copy *copy)
5304 {
5305 __be32 status;
5306
5307 /* cr_consecutive */
5308 status = nfsd4_encode_bool(xdr, true);
5309 if (status != nfs_ok)
5310 return status;
5311 /* cr_synchronous */
5312 return nfsd4_encode_bool(xdr, nfsd4_copy_is_sync(copy));
5313 }
5314
5315 static __be32
nfsd4_encode_copy(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5316 nfsd4_encode_copy(struct nfsd4_compoundres *resp, __be32 nfserr,
5317 union nfsd4_op_u *u)
5318 {
5319 struct nfsd4_copy *copy = &u->copy;
5320
5321 nfserr = nfsd4_encode_write_response4(resp->xdr, copy);
5322 if (nfserr != nfs_ok)
5323 return nfserr;
5324 return nfsd4_encode_copy_requirements4(resp->xdr, copy);
5325 }
5326
5327 static __be32
nfsd4_encode_netloc4(struct xdr_stream * xdr,const struct nl4_server * ns)5328 nfsd4_encode_netloc4(struct xdr_stream *xdr, const struct nl4_server *ns)
5329 {
5330 __be32 status;
5331
5332 if (xdr_stream_encode_u32(xdr, ns->nl4_type) != XDR_UNIT)
5333 return nfserr_resource;
5334 switch (ns->nl4_type) {
5335 case NL4_NETADDR:
5336 /* nl_addr */
5337 status = nfsd4_encode_netaddr4(xdr, &ns->u.nl4_addr);
5338 break;
5339 default:
5340 status = nfserr_serverfault;
5341 }
5342 return status;
5343 }
5344
5345 static __be32
nfsd4_encode_copy_notify(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5346 nfsd4_encode_copy_notify(struct nfsd4_compoundres *resp, __be32 nfserr,
5347 union nfsd4_op_u *u)
5348 {
5349 struct nfsd4_copy_notify *cn = &u->copy_notify;
5350 struct xdr_stream *xdr = resp->xdr;
5351
5352 /* cnr_lease_time */
5353 nfserr = nfsd4_encode_nfstime4(xdr, &cn->cpn_lease_time);
5354 if (nfserr)
5355 return nfserr;
5356 /* cnr_stateid */
5357 nfserr = nfsd4_encode_stateid4(xdr, &cn->cpn_cnr_stateid);
5358 if (nfserr)
5359 return nfserr;
5360 /* cnr_source_server<> */
5361 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5362 return nfserr_resource;
5363 return nfsd4_encode_netloc4(xdr, cn->cpn_src);
5364 }
5365
5366 static __be32
nfsd4_encode_offload_status(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5367 nfsd4_encode_offload_status(struct nfsd4_compoundres *resp, __be32 nfserr,
5368 union nfsd4_op_u *u)
5369 {
5370 struct nfsd4_offload_status *os = &u->offload_status;
5371 struct xdr_stream *xdr = resp->xdr;
5372
5373 /* osr_count */
5374 nfserr = nfsd4_encode_length4(xdr, os->count);
5375 if (nfserr != nfs_ok)
5376 return nfserr;
5377 /* osr_complete<1> */
5378 if (os->completed) {
5379 if (xdr_stream_encode_u32(xdr, 1) != XDR_UNIT)
5380 return nfserr_resource;
5381 if (xdr_stream_encode_be32(xdr, os->status) != XDR_UNIT)
5382 return nfserr_resource;
5383 } else if (xdr_stream_encode_u32(xdr, 0) != XDR_UNIT)
5384 return nfserr_resource;
5385 return nfs_ok;
5386 }
5387
5388 static __be32
nfsd4_encode_read_plus_data(struct nfsd4_compoundres * resp,struct nfsd4_read * read)5389 nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
5390 struct nfsd4_read *read)
5391 {
5392 struct nfsd4_compoundargs *argp = resp->rqstp->rq_argp;
5393 struct file *file = read->rd_nf->nf_file;
5394 struct xdr_stream *xdr = resp->xdr;
5395 bool splice_ok = argp->splice_ok;
5396 unsigned int offset_offset;
5397 __be32 nfserr, wire_count;
5398 unsigned long maxcount;
5399 __be64 wire_offset;
5400
5401 if (xdr_stream_encode_u32(xdr, NFS4_CONTENT_DATA) != XDR_UNIT)
5402 return nfserr_io;
5403
5404 offset_offset = xdr->buf->len;
5405
5406 /* Reserve space for the byte offset and count */
5407 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT * 3)))
5408 return nfserr_io;
5409 xdr_commit_encode(xdr);
5410
5411 maxcount = min_t(unsigned long, read->rd_length,
5412 (xdr->buf->buflen - xdr->buf->len));
5413
5414 if (file->f_op->splice_read && splice_ok)
5415 nfserr = nfsd4_encode_splice_read(resp, read, file, maxcount);
5416 else
5417 nfserr = nfsd4_encode_readv(resp, read, file, maxcount);
5418 if (nfserr)
5419 return nfserr;
5420
5421 wire_offset = cpu_to_be64(read->rd_offset);
5422 write_bytes_to_xdr_buf(xdr->buf, offset_offset, &wire_offset,
5423 XDR_UNIT * 2);
5424 wire_count = cpu_to_be32(read->rd_length);
5425 write_bytes_to_xdr_buf(xdr->buf, offset_offset + XDR_UNIT * 2,
5426 &wire_count, XDR_UNIT);
5427 return nfs_ok;
5428 }
5429
5430 static __be32
nfsd4_encode_read_plus(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5431 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
5432 union nfsd4_op_u *u)
5433 {
5434 struct nfsd4_read *read = &u->read;
5435 struct file *file = read->rd_nf->nf_file;
5436 struct xdr_stream *xdr = resp->xdr;
5437 unsigned int eof_offset;
5438 __be32 wire_data[2];
5439 u32 segments = 0;
5440
5441 if (nfserr)
5442 return nfserr;
5443
5444 eof_offset = xdr->buf->len;
5445
5446 /* Reserve space for the eof flag and segment count */
5447 if (unlikely(!xdr_reserve_space(xdr, XDR_UNIT * 2)))
5448 return nfserr_io;
5449 xdr_commit_encode(xdr);
5450
5451 read->rd_eof = read->rd_offset >= i_size_read(file_inode(file));
5452 if (read->rd_eof)
5453 goto out;
5454
5455 nfserr = nfsd4_encode_read_plus_data(resp, read);
5456 if (nfserr) {
5457 xdr_truncate_encode(xdr, eof_offset);
5458 return nfserr;
5459 }
5460
5461 segments++;
5462
5463 out:
5464 wire_data[0] = read->rd_eof ? xdr_one : xdr_zero;
5465 wire_data[1] = cpu_to_be32(segments);
5466 write_bytes_to_xdr_buf(xdr->buf, eof_offset, &wire_data, XDR_UNIT * 2);
5467 return nfserr;
5468 }
5469
5470 static __be32
nfsd4_encode_seek(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5471 nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
5472 union nfsd4_op_u *u)
5473 {
5474 struct nfsd4_seek *seek = &u->seek;
5475 struct xdr_stream *xdr = resp->xdr;
5476
5477 /* sr_eof */
5478 nfserr = nfsd4_encode_bool(xdr, seek->seek_eof);
5479 if (nfserr != nfs_ok)
5480 return nfserr;
5481 /* sr_offset */
5482 return nfsd4_encode_offset4(xdr, seek->seek_pos);
5483 }
5484
5485 static __be32
nfsd4_encode_noop(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * p)5486 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr,
5487 union nfsd4_op_u *p)
5488 {
5489 return nfserr;
5490 }
5491
5492 /*
5493 * Encode kmalloc-ed buffer in to XDR stream.
5494 */
5495 static __be32
nfsd4_vbuf_to_stream(struct xdr_stream * xdr,char * buf,u32 buflen)5496 nfsd4_vbuf_to_stream(struct xdr_stream *xdr, char *buf, u32 buflen)
5497 {
5498 u32 cplen;
5499 __be32 *p;
5500
5501 cplen = min_t(unsigned long, buflen,
5502 ((void *)xdr->end - (void *)xdr->p));
5503 p = xdr_reserve_space(xdr, cplen);
5504 if (!p)
5505 return nfserr_resource;
5506
5507 memcpy(p, buf, cplen);
5508 buf += cplen;
5509 buflen -= cplen;
5510
5511 while (buflen) {
5512 cplen = min_t(u32, buflen, PAGE_SIZE);
5513 p = xdr_reserve_space(xdr, cplen);
5514 if (!p)
5515 return nfserr_resource;
5516
5517 memcpy(p, buf, cplen);
5518
5519 if (cplen < PAGE_SIZE) {
5520 /*
5521 * We're done, with a length that wasn't page
5522 * aligned, so possibly not word aligned. Pad
5523 * any trailing bytes with 0.
5524 */
5525 xdr_encode_opaque_fixed(p, NULL, cplen);
5526 break;
5527 }
5528
5529 buflen -= PAGE_SIZE;
5530 buf += PAGE_SIZE;
5531 }
5532
5533 return 0;
5534 }
5535
5536 static __be32
nfsd4_encode_getxattr(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5537 nfsd4_encode_getxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5538 union nfsd4_op_u *u)
5539 {
5540 struct nfsd4_getxattr *getxattr = &u->getxattr;
5541 struct xdr_stream *xdr = resp->xdr;
5542 __be32 *p, err;
5543
5544 p = xdr_reserve_space(xdr, 4);
5545 if (!p)
5546 return nfserr_resource;
5547
5548 *p = cpu_to_be32(getxattr->getxa_len);
5549
5550 if (getxattr->getxa_len == 0)
5551 return 0;
5552
5553 err = nfsd4_vbuf_to_stream(xdr, getxattr->getxa_buf,
5554 getxattr->getxa_len);
5555
5556 kvfree(getxattr->getxa_buf);
5557
5558 return err;
5559 }
5560
5561 static __be32
nfsd4_encode_setxattr(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5562 nfsd4_encode_setxattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5563 union nfsd4_op_u *u)
5564 {
5565 struct nfsd4_setxattr *setxattr = &u->setxattr;
5566 struct xdr_stream *xdr = resp->xdr;
5567
5568 return nfsd4_encode_change_info4(xdr, &setxattr->setxa_cinfo);
5569 }
5570
5571 /*
5572 * See if there are cookie values that can be rejected outright.
5573 */
5574 static __be32
nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs * listxattrs,u32 * offsetp)5575 nfsd4_listxattr_validate_cookie(struct nfsd4_listxattrs *listxattrs,
5576 u32 *offsetp)
5577 {
5578 u64 cookie = listxattrs->lsxa_cookie;
5579
5580 /*
5581 * If the cookie is larger than the maximum number we can fit
5582 * in the buffer we just got back from vfs_listxattr, it's invalid.
5583 */
5584 if (cookie > (listxattrs->lsxa_len) / (XATTR_USER_PREFIX_LEN + 2))
5585 return nfserr_badcookie;
5586
5587 *offsetp = (u32)cookie;
5588 return 0;
5589 }
5590
5591 static __be32
nfsd4_encode_listxattrs(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5592 nfsd4_encode_listxattrs(struct nfsd4_compoundres *resp, __be32 nfserr,
5593 union nfsd4_op_u *u)
5594 {
5595 struct nfsd4_listxattrs *listxattrs = &u->listxattrs;
5596 struct xdr_stream *xdr = resp->xdr;
5597 u32 cookie_offset, count_offset, eof;
5598 u32 left, xdrleft, slen, count;
5599 u32 xdrlen, offset;
5600 u64 cookie;
5601 char *sp;
5602 __be32 status, tmp;
5603 __be64 wire_cookie;
5604 __be32 *p;
5605 u32 nuser;
5606
5607 eof = 1;
5608
5609 status = nfsd4_listxattr_validate_cookie(listxattrs, &offset);
5610 if (status)
5611 goto out;
5612
5613 /*
5614 * Reserve space for the cookie and the name array count. Record
5615 * the offsets to save them later.
5616 */
5617 cookie_offset = xdr->buf->len;
5618 count_offset = cookie_offset + 8;
5619 p = xdr_reserve_space(xdr, XDR_UNIT * 3);
5620 if (!p) {
5621 status = nfserr_resource;
5622 goto out;
5623 }
5624
5625 count = 0;
5626 left = listxattrs->lsxa_len;
5627 sp = listxattrs->lsxa_buf;
5628 nuser = 0;
5629
5630 /* Bytes left is maxcount - 8 (cookie) - 4 (array count) */
5631 xdrleft = listxattrs->lsxa_maxcount - XDR_UNIT * 3;
5632
5633 while (left > 0 && xdrleft > 0) {
5634 slen = strlen(sp);
5635
5636 /*
5637 * Check if this is a "user." attribute, skip it if not.
5638 */
5639 if (strncmp(sp, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
5640 goto contloop;
5641
5642 slen -= XATTR_USER_PREFIX_LEN;
5643 xdrlen = 4 + ((slen + 3) & ~3);
5644 /* Check if both entry and eof can fit in the XDR buffer */
5645 if (xdrlen + XDR_UNIT > xdrleft) {
5646 if (count == 0) {
5647 /*
5648 * Can't even fit the first attribute name.
5649 */
5650 status = nfserr_toosmall;
5651 goto out;
5652 }
5653 eof = 0;
5654 goto wreof;
5655 }
5656
5657 left -= XATTR_USER_PREFIX_LEN;
5658 sp += XATTR_USER_PREFIX_LEN;
5659 if (nuser++ < offset)
5660 goto contloop;
5661
5662
5663 p = xdr_reserve_space(xdr, xdrlen);
5664 if (!p) {
5665 status = nfserr_resource;
5666 goto out;
5667 }
5668
5669 xdr_encode_opaque(p, sp, slen);
5670
5671 xdrleft -= xdrlen;
5672 count++;
5673 contloop:
5674 sp += slen + 1;
5675 left -= slen + 1;
5676 }
5677
5678 /*
5679 * If there were user attributes to copy, but we didn't copy
5680 * any, the offset was too large (e.g. the cookie was invalid).
5681 */
5682 if (nuser > 0 && count == 0) {
5683 status = nfserr_badcookie;
5684 goto out;
5685 }
5686
5687 wreof:
5688 p = xdr_reserve_space(xdr, 4);
5689 if (!p) {
5690 status = nfserr_resource;
5691 goto out;
5692 }
5693 *p = cpu_to_be32(eof);
5694
5695 cookie = offset + count;
5696
5697 wire_cookie = cpu_to_be64(cookie);
5698 write_bytes_to_xdr_buf(xdr->buf, cookie_offset, &wire_cookie, 8);
5699 tmp = cpu_to_be32(count);
5700 write_bytes_to_xdr_buf(xdr->buf, count_offset, &tmp, 4);
5701 out:
5702 if (listxattrs->lsxa_len)
5703 kvfree(listxattrs->lsxa_buf);
5704 return status;
5705 }
5706
5707 static __be32
nfsd4_encode_removexattr(struct nfsd4_compoundres * resp,__be32 nfserr,union nfsd4_op_u * u)5708 nfsd4_encode_removexattr(struct nfsd4_compoundres *resp, __be32 nfserr,
5709 union nfsd4_op_u *u)
5710 {
5711 struct nfsd4_removexattr *removexattr = &u->removexattr;
5712 struct xdr_stream *xdr = resp->xdr;
5713
5714 return nfsd4_encode_change_info4(xdr, &removexattr->rmxa_cinfo);
5715 }
5716
5717 typedef __be32(*nfsd4_enc)(struct nfsd4_compoundres *, __be32, union nfsd4_op_u *u);
5718
5719 /*
5720 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
5721 * since we don't need to filter out obsolete ops as this is
5722 * done in the decoding phase.
5723 */
5724 static const nfsd4_enc nfsd4_enc_ops[] = {
5725 [OP_ACCESS] = nfsd4_encode_access,
5726 [OP_CLOSE] = nfsd4_encode_close,
5727 [OP_COMMIT] = nfsd4_encode_commit,
5728 [OP_CREATE] = nfsd4_encode_create,
5729 [OP_DELEGPURGE] = nfsd4_encode_noop,
5730 [OP_DELEGRETURN] = nfsd4_encode_noop,
5731 [OP_GETATTR] = nfsd4_encode_getattr,
5732 [OP_GETFH] = nfsd4_encode_getfh,
5733 [OP_LINK] = nfsd4_encode_link,
5734 [OP_LOCK] = nfsd4_encode_lock,
5735 [OP_LOCKT] = nfsd4_encode_lockt,
5736 [OP_LOCKU] = nfsd4_encode_locku,
5737 [OP_LOOKUP] = nfsd4_encode_noop,
5738 [OP_LOOKUPP] = nfsd4_encode_noop,
5739 [OP_NVERIFY] = nfsd4_encode_noop,
5740 [OP_OPEN] = nfsd4_encode_open,
5741 [OP_OPENATTR] = nfsd4_encode_noop,
5742 [OP_OPEN_CONFIRM] = nfsd4_encode_open_confirm,
5743 [OP_OPEN_DOWNGRADE] = nfsd4_encode_open_downgrade,
5744 [OP_PUTFH] = nfsd4_encode_noop,
5745 [OP_PUTPUBFH] = nfsd4_encode_noop,
5746 [OP_PUTROOTFH] = nfsd4_encode_noop,
5747 [OP_READ] = nfsd4_encode_read,
5748 [OP_READDIR] = nfsd4_encode_readdir,
5749 [OP_READLINK] = nfsd4_encode_readlink,
5750 [OP_REMOVE] = nfsd4_encode_remove,
5751 [OP_RENAME] = nfsd4_encode_rename,
5752 [OP_RENEW] = nfsd4_encode_noop,
5753 [OP_RESTOREFH] = nfsd4_encode_noop,
5754 [OP_SAVEFH] = nfsd4_encode_noop,
5755 [OP_SECINFO] = nfsd4_encode_secinfo,
5756 [OP_SETATTR] = nfsd4_encode_setattr,
5757 [OP_SETCLIENTID] = nfsd4_encode_setclientid,
5758 [OP_SETCLIENTID_CONFIRM] = nfsd4_encode_noop,
5759 [OP_VERIFY] = nfsd4_encode_noop,
5760 [OP_WRITE] = nfsd4_encode_write,
5761 [OP_RELEASE_LOCKOWNER] = nfsd4_encode_noop,
5762
5763 /* NFSv4.1 operations */
5764 [OP_BACKCHANNEL_CTL] = nfsd4_encode_noop,
5765 [OP_BIND_CONN_TO_SESSION] = nfsd4_encode_bind_conn_to_session,
5766 [OP_EXCHANGE_ID] = nfsd4_encode_exchange_id,
5767 [OP_CREATE_SESSION] = nfsd4_encode_create_session,
5768 [OP_DESTROY_SESSION] = nfsd4_encode_noop,
5769 [OP_FREE_STATEID] = nfsd4_encode_noop,
5770 [OP_GET_DIR_DELEGATION] = nfsd4_encode_get_dir_delegation,
5771 #ifdef CONFIG_NFSD_PNFS
5772 [OP_GETDEVICEINFO] = nfsd4_encode_getdeviceinfo,
5773 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5774 [OP_LAYOUTCOMMIT] = nfsd4_encode_layoutcommit,
5775 [OP_LAYOUTGET] = nfsd4_encode_layoutget,
5776 [OP_LAYOUTRETURN] = nfsd4_encode_layoutreturn,
5777 #else
5778 [OP_GETDEVICEINFO] = nfsd4_encode_noop,
5779 [OP_GETDEVICELIST] = nfsd4_encode_noop,
5780 [OP_LAYOUTCOMMIT] = nfsd4_encode_noop,
5781 [OP_LAYOUTGET] = nfsd4_encode_noop,
5782 [OP_LAYOUTRETURN] = nfsd4_encode_noop,
5783 #endif
5784 [OP_SECINFO_NO_NAME] = nfsd4_encode_secinfo_no_name,
5785 [OP_SEQUENCE] = nfsd4_encode_sequence,
5786 [OP_SET_SSV] = nfsd4_encode_noop,
5787 [OP_TEST_STATEID] = nfsd4_encode_test_stateid,
5788 [OP_WANT_DELEGATION] = nfsd4_encode_noop,
5789 [OP_DESTROY_CLIENTID] = nfsd4_encode_noop,
5790 [OP_RECLAIM_COMPLETE] = nfsd4_encode_noop,
5791
5792 /* NFSv4.2 operations */
5793 [OP_ALLOCATE] = nfsd4_encode_noop,
5794 [OP_COPY] = nfsd4_encode_copy,
5795 [OP_COPY_NOTIFY] = nfsd4_encode_copy_notify,
5796 [OP_DEALLOCATE] = nfsd4_encode_noop,
5797 [OP_IO_ADVISE] = nfsd4_encode_noop,
5798 [OP_LAYOUTERROR] = nfsd4_encode_noop,
5799 [OP_LAYOUTSTATS] = nfsd4_encode_noop,
5800 [OP_OFFLOAD_CANCEL] = nfsd4_encode_noop,
5801 [OP_OFFLOAD_STATUS] = nfsd4_encode_offload_status,
5802 [OP_READ_PLUS] = nfsd4_encode_read_plus,
5803 [OP_SEEK] = nfsd4_encode_seek,
5804 [OP_WRITE_SAME] = nfsd4_encode_noop,
5805 [OP_CLONE] = nfsd4_encode_noop,
5806
5807 /* RFC 8276 extended atributes operations */
5808 [OP_GETXATTR] = nfsd4_encode_getxattr,
5809 [OP_SETXATTR] = nfsd4_encode_setxattr,
5810 [OP_LISTXATTRS] = nfsd4_encode_listxattrs,
5811 [OP_REMOVEXATTR] = nfsd4_encode_removexattr,
5812 };
5813
5814 /*
5815 * Calculate whether we still have space to encode repsize bytes.
5816 * There are two considerations:
5817 * - For NFS versions >=4.1, the size of the reply must stay within
5818 * session limits
5819 * - For all NFS versions, we must stay within limited preallocated
5820 * buffer space.
5821 *
5822 * This is called before the operation is processed, so can only provide
5823 * an upper estimate. For some nonidempotent operations (such as
5824 * getattr), it's not necessarily a problem if that estimate is wrong,
5825 * as we can fail it after processing without significant side effects.
5826 */
nfsd4_check_resp_size(struct nfsd4_compoundres * resp,u32 respsize)5827 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 respsize)
5828 {
5829 struct xdr_buf *buf = &resp->rqstp->rq_res;
5830 struct nfsd4_slot *slot = resp->cstate.slot;
5831
5832 if (buf->len + respsize <= buf->buflen)
5833 return nfs_ok;
5834 if (!nfsd4_has_session(&resp->cstate))
5835 return nfserr_resource;
5836 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS) {
5837 WARN_ON_ONCE(1);
5838 return nfserr_rep_too_big_to_cache;
5839 }
5840 return nfserr_rep_too_big;
5841 }
5842
nfsd4_map_status(__be32 status,u32 minor)5843 static __be32 nfsd4_map_status(__be32 status, u32 minor)
5844 {
5845 switch (status) {
5846 case nfs_ok:
5847 break;
5848 case nfserr_wrong_type:
5849 /* RFC 8881 - 15.1.2.9 */
5850 if (minor == 0)
5851 status = nfserr_inval;
5852 break;
5853 case nfserr_symlink_not_dir:
5854 status = nfserr_symlink;
5855 break;
5856 }
5857 return status;
5858 }
5859
5860 void
nfsd4_encode_operation(struct nfsd4_compoundres * resp,struct nfsd4_op * op)5861 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
5862 {
5863 struct xdr_stream *xdr = resp->xdr;
5864 struct nfs4_stateowner *so = resp->cstate.replay_owner;
5865 struct svc_rqst *rqstp = resp->rqstp;
5866 const struct nfsd4_operation *opdesc = op->opdesc;
5867 unsigned int op_status_offset;
5868 nfsd4_enc encoder;
5869
5870 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT)
5871 goto release;
5872 op_status_offset = xdr->buf->len;
5873 if (!xdr_reserve_space(xdr, XDR_UNIT))
5874 goto release;
5875
5876 if (op->opnum == OP_ILLEGAL)
5877 goto status;
5878 if (op->status && opdesc &&
5879 !(opdesc->op_flags & OP_NONTRIVIAL_ERROR_ENCODE))
5880 goto status;
5881 BUG_ON(op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
5882 !nfsd4_enc_ops[op->opnum]);
5883 encoder = nfsd4_enc_ops[op->opnum];
5884 op->status = encoder(resp, op->status, &op->u);
5885 if (op->status)
5886 trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status);
5887 xdr_commit_encode(xdr);
5888
5889 /* nfsd4_check_resp_size guarantees enough room for error status */
5890 if (!op->status) {
5891 int space_needed = 0;
5892 if (!nfsd4_last_compound_op(rqstp))
5893 space_needed = COMPOUND_ERR_SLACK_SPACE;
5894 op->status = nfsd4_check_resp_size(resp, space_needed);
5895 }
5896 if (op->status == nfserr_resource && nfsd4_has_session(&resp->cstate)) {
5897 struct nfsd4_slot *slot = resp->cstate.slot;
5898
5899 if (slot->sl_flags & NFSD4_SLOT_CACHETHIS)
5900 op->status = nfserr_rep_too_big_to_cache;
5901 else
5902 op->status = nfserr_rep_too_big;
5903 }
5904 if (op->status == nfserr_resource ||
5905 op->status == nfserr_rep_too_big ||
5906 op->status == nfserr_rep_too_big_to_cache) {
5907 /*
5908 * The operation may have already been encoded or
5909 * partially encoded. No op returns anything additional
5910 * in the case of one of these three errors, so we can
5911 * just truncate back to after the status. But it's a
5912 * bug if we had to do this on a non-idempotent op:
5913 */
5914 warn_on_nonidempotent_op(op);
5915 xdr_truncate_encode(xdr, op_status_offset + XDR_UNIT);
5916 }
5917 if (so) {
5918 int len = xdr->buf->len - (op_status_offset + XDR_UNIT);
5919
5920 so->so_replay.rp_status = op->status;
5921 so->so_replay.rp_buflen = len;
5922 read_bytes_from_xdr_buf(xdr->buf, op_status_offset + XDR_UNIT,
5923 so->so_replay.rp_buf, len);
5924 }
5925 status:
5926 op->status = nfsd4_map_status(op->status,
5927 resp->cstate.minorversion);
5928 write_bytes_to_xdr_buf(xdr->buf, op_status_offset,
5929 &op->status, XDR_UNIT);
5930 release:
5931 if (opdesc && opdesc->op_release)
5932 opdesc->op_release(&op->u);
5933
5934 /*
5935 * Account for pages consumed while encoding this operation.
5936 * The xdr_stream primitives don't manage rq_next_page.
5937 */
5938 rqstp->rq_next_page = xdr->page_ptr + 1;
5939 }
5940
5941 /**
5942 * nfsd4_encode_replay - encode a result stored in the stateowner reply cache
5943 * @xdr: send buffer's XDR stream
5944 * @op: operation being replayed
5945 *
5946 * @op->replay->rp_buf contains the previously-sent already-encoded result.
5947 */
nfsd4_encode_replay(struct xdr_stream * xdr,struct nfsd4_op * op)5948 void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op)
5949 {
5950 struct nfs4_replay *rp = op->replay;
5951
5952 trace_nfsd_stateowner_replay(op->opnum, rp);
5953
5954 if (xdr_stream_encode_u32(xdr, op->opnum) != XDR_UNIT)
5955 return;
5956 if (xdr_stream_encode_be32(xdr, rp->rp_status) != XDR_UNIT)
5957 return;
5958 xdr_stream_encode_opaque_fixed(xdr, rp->rp_buf, rp->rp_buflen);
5959 }
5960
nfsd4_release_compoundargs(struct svc_rqst * rqstp)5961 void nfsd4_release_compoundargs(struct svc_rqst *rqstp)
5962 {
5963 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5964
5965 if (args->ops != args->iops) {
5966 vfree(args->ops);
5967 args->ops = args->iops;
5968 }
5969 while (args->to_free) {
5970 struct svcxdr_tmpbuf *tb = args->to_free;
5971 args->to_free = tb->next;
5972 kfree(tb);
5973 }
5974 }
5975
5976 bool
nfs4svc_decode_compoundargs(struct svc_rqst * rqstp,struct xdr_stream * xdr)5977 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5978 {
5979 struct nfsd4_compoundargs *args = rqstp->rq_argp;
5980
5981 /* svcxdr_tmp_alloc */
5982 args->to_free = NULL;
5983
5984 args->xdr = xdr;
5985 args->ops = args->iops;
5986 args->rqstp = rqstp;
5987
5988 return nfsd4_decode_compound(args);
5989 }
5990
5991 bool
nfs4svc_encode_compoundres(struct svc_rqst * rqstp,struct xdr_stream * xdr)5992 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
5993 {
5994 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5995 __be32 *p;
5996
5997 /*
5998 * Send buffer space for the following items is reserved
5999 * at the top of nfsd4_proc_compound().
6000 */
6001 p = resp->statusp;
6002
6003 *p++ = resp->cstate.status;
6004 *p++ = htonl(resp->taglen);
6005 memcpy(p, resp->tag, resp->taglen);
6006 p += XDR_QUADLEN(resp->taglen);
6007 *p++ = htonl(resp->opcnt);
6008
6009 nfsd4_sequence_done(resp);
6010 return true;
6011 }
6012