1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/nfs/nfs3xdr.c
4 *
5 * XDR functions to encode/decode NFSv3 RPC arguments and results.
6 *
7 * Copyright (C) 1996, 1997 Olaf Kirch
8 */
9
10 #include <linux/param.h>
11 #include <linux/time.h>
12 #include <linux/mm.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/in.h>
16 #include <linux/pagemap.h>
17 #include <linux/proc_fs.h>
18 #include <linux/kdev_t.h>
19 #include <linux/sunrpc/clnt.h>
20 #include <linux/nfs.h>
21 #include <linux/nfs3.h>
22 #include <linux/nfs_fs.h>
23 #include <linux/nfsacl.h>
24 #include "nfstrace.h"
25 #include "internal.h"
26
27 #define NFSDBG_FACILITY NFSDBG_XDR
28
29 /* Mapping from NFS error code to "errno" error code. */
30 #define errno_NFSERR_IO EIO
31
32 /*
33 * Declare the space requirements for NFS arguments and replies as
34 * number of 32bit-words
35 */
36 #define NFS3_fhandle_sz (1+16)
37 #define NFS3_fh_sz (NFS3_fhandle_sz) /* shorthand */
38 #define NFS3_sattr_sz (15)
39 #define NFS3_filename_sz (1+(NFS3_MAXNAMLEN>>2))
40 #define NFS3_path_sz (1+(NFS3_MAXPATHLEN>>2))
41 #define NFS3_fattr_sz (21)
42 #define NFS3_cookieverf_sz (NFS3_COOKIEVERFSIZE>>2)
43 #define NFS3_wcc_attr_sz (6)
44 #define NFS3_pre_op_attr_sz (1+NFS3_wcc_attr_sz)
45 #define NFS3_post_op_attr_sz (1+NFS3_fattr_sz)
46 #define NFS3_wcc_data_sz (NFS3_pre_op_attr_sz+NFS3_post_op_attr_sz)
47 #define NFS3_diropargs_sz (NFS3_fh_sz+NFS3_filename_sz)
48
49 #define NFS3_getattrargs_sz (NFS3_fh_sz)
50 #define NFS3_setattrargs_sz (NFS3_fh_sz+NFS3_sattr_sz+3)
51 #define NFS3_lookupargs_sz (NFS3_fh_sz+NFS3_filename_sz)
52 #define NFS3_accessargs_sz (NFS3_fh_sz+1)
53 #define NFS3_readlinkargs_sz (NFS3_fh_sz)
54 #define NFS3_readargs_sz (NFS3_fh_sz+3)
55 #define NFS3_writeargs_sz (NFS3_fh_sz+5)
56 #define NFS3_createargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
57 #define NFS3_mkdirargs_sz (NFS3_diropargs_sz+NFS3_sattr_sz)
58 #define NFS3_symlinkargs_sz (NFS3_diropargs_sz+1+NFS3_sattr_sz)
59 #define NFS3_mknodargs_sz (NFS3_diropargs_sz+2+NFS3_sattr_sz)
60 #define NFS3_removeargs_sz (NFS3_fh_sz+NFS3_filename_sz)
61 #define NFS3_renameargs_sz (NFS3_diropargs_sz+NFS3_diropargs_sz)
62 #define NFS3_linkargs_sz (NFS3_fh_sz+NFS3_diropargs_sz)
63 #define NFS3_readdirargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+3)
64 #define NFS3_readdirplusargs_sz (NFS3_fh_sz+NFS3_cookieverf_sz+4)
65 #define NFS3_commitargs_sz (NFS3_fh_sz+3)
66
67 #define NFS3_getattrres_sz (1+NFS3_fattr_sz)
68 #define NFS3_setattrres_sz (1+NFS3_wcc_data_sz)
69 #define NFS3_removeres_sz (NFS3_setattrres_sz)
70 #define NFS3_lookupres_sz (1+NFS3_fh_sz+(2 * NFS3_post_op_attr_sz))
71 #define NFS3_accessres_sz (1+NFS3_post_op_attr_sz+1)
72 #define NFS3_readlinkres_sz (1+NFS3_post_op_attr_sz+1+1)
73 #define NFS3_readres_sz (1+NFS3_post_op_attr_sz+3+1)
74 #define NFS3_writeres_sz (1+NFS3_wcc_data_sz+4)
75 #define NFS3_createres_sz (1+NFS3_fh_sz+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
76 #define NFS3_renameres_sz (1+(2 * NFS3_wcc_data_sz))
77 #define NFS3_linkres_sz (1+NFS3_post_op_attr_sz+NFS3_wcc_data_sz)
78 #define NFS3_readdirres_sz (1+NFS3_post_op_attr_sz+2+1)
79 #define NFS3_fsstatres_sz (1+NFS3_post_op_attr_sz+13)
80 #define NFS3_fsinfores_sz (1+NFS3_post_op_attr_sz+12)
81 #define NFS3_pathconfres_sz (1+NFS3_post_op_attr_sz+6)
82 #define NFS3_commitres_sz (1+NFS3_wcc_data_sz+2)
83
84 #define ACL3_getaclargs_sz (NFS3_fh_sz+1)
85 #define ACL3_setaclargs_sz (NFS3_fh_sz+1+ \
86 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE))
87 #define ACL3_getaclres_sz (1+NFS3_post_op_attr_sz+1+ \
88 XDR_QUADLEN(NFS_ACL_INLINE_BUFSIZE)+1)
89 #define ACL3_setaclres_sz (1+NFS3_post_op_attr_sz)
90
91 static int nfs3_stat_to_errno(enum nfs_stat);
92
93 /*
94 * Map file type to S_IFMT bits
95 */
96 static const umode_t nfs_type2fmt[] = {
97 [NF3BAD] = 0,
98 [NF3REG] = S_IFREG,
99 [NF3DIR] = S_IFDIR,
100 [NF3BLK] = S_IFBLK,
101 [NF3CHR] = S_IFCHR,
102 [NF3LNK] = S_IFLNK,
103 [NF3SOCK] = S_IFSOCK,
104 [NF3FIFO] = S_IFIFO,
105 };
106
rpc_userns(const struct rpc_clnt * clnt)107 static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
108 {
109 if (clnt && clnt->cl_cred)
110 return clnt->cl_cred->user_ns;
111 return &init_user_ns;
112 }
113
rpc_rqst_userns(const struct rpc_rqst * rqstp)114 static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
115 {
116 if (rqstp->rq_task)
117 return rpc_userns(rqstp->rq_task->tk_client);
118 return &init_user_ns;
119 }
120
121 /*
122 * Encode/decode NFSv3 basic data types
123 *
124 * Basic NFSv3 data types are defined in section 2.5 of RFC 1813:
125 * "NFS Version 3 Protocol Specification".
126 *
127 * Not all basic data types have their own encoding and decoding
128 * functions. For run-time efficiency, some data types are encoded
129 * or decoded inline.
130 */
131
encode_uint32(struct xdr_stream * xdr,u32 value)132 static void encode_uint32(struct xdr_stream *xdr, u32 value)
133 {
134 __be32 *p = xdr_reserve_space(xdr, 4);
135 *p = cpu_to_be32(value);
136 }
137
decode_uint32(struct xdr_stream * xdr,u32 * value)138 static int decode_uint32(struct xdr_stream *xdr, u32 *value)
139 {
140 __be32 *p;
141
142 p = xdr_inline_decode(xdr, 4);
143 if (unlikely(!p))
144 return -EIO;
145 *value = be32_to_cpup(p);
146 return 0;
147 }
148
decode_uint64(struct xdr_stream * xdr,u64 * value)149 static int decode_uint64(struct xdr_stream *xdr, u64 *value)
150 {
151 __be32 *p;
152
153 p = xdr_inline_decode(xdr, 8);
154 if (unlikely(!p))
155 return -EIO;
156 xdr_decode_hyper(p, value);
157 return 0;
158 }
159
160 /*
161 * fileid3
162 *
163 * typedef uint64 fileid3;
164 */
xdr_decode_fileid3(__be32 * p,u64 * fileid)165 static __be32 *xdr_decode_fileid3(__be32 *p, u64 *fileid)
166 {
167 return xdr_decode_hyper(p, fileid);
168 }
169
decode_fileid3(struct xdr_stream * xdr,u64 * fileid)170 static int decode_fileid3(struct xdr_stream *xdr, u64 *fileid)
171 {
172 return decode_uint64(xdr, fileid);
173 }
174
175 /*
176 * filename3
177 *
178 * typedef string filename3<>;
179 */
encode_filename3(struct xdr_stream * xdr,const char * name,u32 length)180 static void encode_filename3(struct xdr_stream *xdr,
181 const char *name, u32 length)
182 {
183 __be32 *p;
184
185 WARN_ON_ONCE(length > NFS3_MAXNAMLEN);
186 p = xdr_reserve_space(xdr, 4 + length);
187 xdr_encode_opaque(p, name, length);
188 }
189
decode_inline_filename3(struct xdr_stream * xdr,const char ** name,u32 * length)190 static int decode_inline_filename3(struct xdr_stream *xdr,
191 const char **name, u32 *length)
192 {
193 __be32 *p;
194 u32 count;
195
196 p = xdr_inline_decode(xdr, 4);
197 if (unlikely(!p))
198 return -EIO;
199 count = be32_to_cpup(p);
200 if (count > NFS3_MAXNAMLEN)
201 goto out_nametoolong;
202 p = xdr_inline_decode(xdr, count);
203 if (unlikely(!p))
204 return -EIO;
205 *name = (const char *)p;
206 *length = count;
207 return 0;
208
209 out_nametoolong:
210 dprintk("NFS: returned filename too long: %u\n", count);
211 return -ENAMETOOLONG;
212 }
213
214 /*
215 * nfspath3
216 *
217 * typedef string nfspath3<>;
218 */
encode_nfspath3(struct xdr_stream * xdr,struct page ** pages,const u32 length)219 static void encode_nfspath3(struct xdr_stream *xdr, struct page **pages,
220 const u32 length)
221 {
222 encode_uint32(xdr, length);
223 xdr_write_pages(xdr, pages, 0, length);
224 }
225
decode_nfspath3(struct xdr_stream * xdr)226 static int decode_nfspath3(struct xdr_stream *xdr)
227 {
228 u32 recvd, count;
229 __be32 *p;
230
231 p = xdr_inline_decode(xdr, 4);
232 if (unlikely(!p))
233 return -EIO;
234 count = be32_to_cpup(p);
235 if (unlikely(count >= xdr->buf->page_len || count > NFS3_MAXPATHLEN))
236 goto out_nametoolong;
237 recvd = xdr_read_pages(xdr, count);
238 if (unlikely(count > recvd))
239 goto out_cheating;
240 xdr_terminate_string(xdr->buf, count);
241 return 0;
242
243 out_nametoolong:
244 dprintk("NFS: returned pathname too long: %u\n", count);
245 return -ENAMETOOLONG;
246 out_cheating:
247 dprintk("NFS: server cheating in pathname result: "
248 "count %u > recvd %u\n", count, recvd);
249 return -EIO;
250 }
251
252 /*
253 * cookie3
254 *
255 * typedef uint64 cookie3
256 */
xdr_encode_cookie3(__be32 * p,u64 cookie)257 static __be32 *xdr_encode_cookie3(__be32 *p, u64 cookie)
258 {
259 return xdr_encode_hyper(p, cookie);
260 }
261
decode_cookie3(struct xdr_stream * xdr,u64 * cookie)262 static int decode_cookie3(struct xdr_stream *xdr, u64 *cookie)
263 {
264 return decode_uint64(xdr, cookie);
265 }
266
267 /*
268 * cookieverf3
269 *
270 * typedef opaque cookieverf3[NFS3_COOKIEVERFSIZE];
271 */
xdr_encode_cookieverf3(__be32 * p,const __be32 * verifier)272 static __be32 *xdr_encode_cookieverf3(__be32 *p, const __be32 *verifier)
273 {
274 memcpy(p, verifier, NFS3_COOKIEVERFSIZE);
275 return p + XDR_QUADLEN(NFS3_COOKIEVERFSIZE);
276 }
277
decode_cookieverf3(struct xdr_stream * xdr,__be32 * verifier)278 static int decode_cookieverf3(struct xdr_stream *xdr, __be32 *verifier)
279 {
280 __be32 *p;
281
282 p = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE);
283 if (unlikely(!p))
284 return -EIO;
285 memcpy(verifier, p, NFS3_COOKIEVERFSIZE);
286 return 0;
287 }
288
289 /*
290 * createverf3
291 *
292 * typedef opaque createverf3[NFS3_CREATEVERFSIZE];
293 */
encode_createverf3(struct xdr_stream * xdr,const __be32 * verifier)294 static void encode_createverf3(struct xdr_stream *xdr, const __be32 *verifier)
295 {
296 __be32 *p;
297
298 p = xdr_reserve_space(xdr, NFS3_CREATEVERFSIZE);
299 memcpy(p, verifier, NFS3_CREATEVERFSIZE);
300 }
301
decode_writeverf3(struct xdr_stream * xdr,struct nfs_write_verifier * verifier)302 static int decode_writeverf3(struct xdr_stream *xdr, struct nfs_write_verifier *verifier)
303 {
304 __be32 *p;
305
306 p = xdr_inline_decode(xdr, NFS3_WRITEVERFSIZE);
307 if (unlikely(!p))
308 return -EIO;
309 memcpy(verifier->data, p, NFS3_WRITEVERFSIZE);
310 return 0;
311 }
312
313 /*
314 * size3
315 *
316 * typedef uint64 size3;
317 */
xdr_decode_size3(__be32 * p,u64 * size)318 static __be32 *xdr_decode_size3(__be32 *p, u64 *size)
319 {
320 return xdr_decode_hyper(p, size);
321 }
322
323 /*
324 * nfsstat3
325 *
326 * enum nfsstat3 {
327 * NFS3_OK = 0,
328 * ...
329 * }
330 */
331 #define NFS3_OK NFS_OK
332
decode_nfsstat3(struct xdr_stream * xdr,enum nfs_stat * status)333 static int decode_nfsstat3(struct xdr_stream *xdr, enum nfs_stat *status)
334 {
335 __be32 *p;
336
337 p = xdr_inline_decode(xdr, 4);
338 if (unlikely(!p))
339 return -EIO;
340 if (unlikely(*p != cpu_to_be32(NFS3_OK)))
341 goto out_status;
342 *status = 0;
343 return 0;
344 out_status:
345 *status = be32_to_cpup(p);
346 trace_nfs_xdr_status(xdr, (int)*status);
347 return 0;
348 }
349
350 /*
351 * ftype3
352 *
353 * enum ftype3 {
354 * NF3REG = 1,
355 * NF3DIR = 2,
356 * NF3BLK = 3,
357 * NF3CHR = 4,
358 * NF3LNK = 5,
359 * NF3SOCK = 6,
360 * NF3FIFO = 7
361 * };
362 */
encode_ftype3(struct xdr_stream * xdr,const u32 type)363 static void encode_ftype3(struct xdr_stream *xdr, const u32 type)
364 {
365 encode_uint32(xdr, type);
366 }
367
xdr_decode_ftype3(__be32 * p,umode_t * mode)368 static __be32 *xdr_decode_ftype3(__be32 *p, umode_t *mode)
369 {
370 u32 type;
371
372 type = be32_to_cpup(p++);
373 if (type > NF3FIFO)
374 type = NF3NON;
375 *mode = nfs_type2fmt[type];
376 return p;
377 }
378
379 /*
380 * specdata3
381 *
382 * struct specdata3 {
383 * uint32 specdata1;
384 * uint32 specdata2;
385 * };
386 */
encode_specdata3(struct xdr_stream * xdr,const dev_t rdev)387 static void encode_specdata3(struct xdr_stream *xdr, const dev_t rdev)
388 {
389 __be32 *p;
390
391 p = xdr_reserve_space(xdr, 8);
392 *p++ = cpu_to_be32(MAJOR(rdev));
393 *p = cpu_to_be32(MINOR(rdev));
394 }
395
xdr_decode_specdata3(__be32 * p,dev_t * rdev)396 static __be32 *xdr_decode_specdata3(__be32 *p, dev_t *rdev)
397 {
398 unsigned int major, minor;
399
400 major = be32_to_cpup(p++);
401 minor = be32_to_cpup(p++);
402 *rdev = MKDEV(major, minor);
403 if (MAJOR(*rdev) != major || MINOR(*rdev) != minor)
404 *rdev = 0;
405 return p;
406 }
407
408 /*
409 * nfs_fh3
410 *
411 * struct nfs_fh3 {
412 * opaque data<NFS3_FHSIZE>;
413 * };
414 */
encode_nfs_fh3(struct xdr_stream * xdr,const struct nfs_fh * fh)415 static void encode_nfs_fh3(struct xdr_stream *xdr, const struct nfs_fh *fh)
416 {
417 __be32 *p;
418
419 WARN_ON_ONCE(fh->size > NFS3_FHSIZE);
420 p = xdr_reserve_space(xdr, 4 + fh->size);
421 xdr_encode_opaque(p, fh->data, fh->size);
422 }
423
decode_nfs_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)424 static int decode_nfs_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
425 {
426 u32 length;
427 __be32 *p;
428
429 p = xdr_inline_decode(xdr, 4);
430 if (unlikely(!p))
431 return -EIO;
432 length = be32_to_cpup(p++);
433 if (unlikely(length > NFS3_FHSIZE))
434 goto out_toobig;
435 p = xdr_inline_decode(xdr, length);
436 if (unlikely(!p))
437 return -EIO;
438 fh->size = length;
439 memcpy(fh->data, p, length);
440 return 0;
441 out_toobig:
442 dprintk("NFS: file handle size (%u) too big\n", length);
443 return -E2BIG;
444 }
445
zero_nfs_fh3(struct nfs_fh * fh)446 static void zero_nfs_fh3(struct nfs_fh *fh)
447 {
448 memset(fh, 0, sizeof(*fh));
449 }
450
451 /*
452 * nfstime3
453 *
454 * struct nfstime3 {
455 * uint32 seconds;
456 * uint32 nseconds;
457 * };
458 */
xdr_encode_nfstime3(__be32 * p,const struct timespec * timep)459 static __be32 *xdr_encode_nfstime3(__be32 *p, const struct timespec *timep)
460 {
461 *p++ = cpu_to_be32(timep->tv_sec);
462 *p++ = cpu_to_be32(timep->tv_nsec);
463 return p;
464 }
465
xdr_decode_nfstime3(__be32 * p,struct timespec * timep)466 static __be32 *xdr_decode_nfstime3(__be32 *p, struct timespec *timep)
467 {
468 timep->tv_sec = be32_to_cpup(p++);
469 timep->tv_nsec = be32_to_cpup(p++);
470 return p;
471 }
472
473 /*
474 * sattr3
475 *
476 * enum time_how {
477 * DONT_CHANGE = 0,
478 * SET_TO_SERVER_TIME = 1,
479 * SET_TO_CLIENT_TIME = 2
480 * };
481 *
482 * union set_mode3 switch (bool set_it) {
483 * case TRUE:
484 * mode3 mode;
485 * default:
486 * void;
487 * };
488 *
489 * union set_uid3 switch (bool set_it) {
490 * case TRUE:
491 * uid3 uid;
492 * default:
493 * void;
494 * };
495 *
496 * union set_gid3 switch (bool set_it) {
497 * case TRUE:
498 * gid3 gid;
499 * default:
500 * void;
501 * };
502 *
503 * union set_size3 switch (bool set_it) {
504 * case TRUE:
505 * size3 size;
506 * default:
507 * void;
508 * };
509 *
510 * union set_atime switch (time_how set_it) {
511 * case SET_TO_CLIENT_TIME:
512 * nfstime3 atime;
513 * default:
514 * void;
515 * };
516 *
517 * union set_mtime switch (time_how set_it) {
518 * case SET_TO_CLIENT_TIME:
519 * nfstime3 mtime;
520 * default:
521 * void;
522 * };
523 *
524 * struct sattr3 {
525 * set_mode3 mode;
526 * set_uid3 uid;
527 * set_gid3 gid;
528 * set_size3 size;
529 * set_atime atime;
530 * set_mtime mtime;
531 * };
532 */
encode_sattr3(struct xdr_stream * xdr,const struct iattr * attr,struct user_namespace * userns)533 static void encode_sattr3(struct xdr_stream *xdr, const struct iattr *attr,
534 struct user_namespace *userns)
535 {
536 struct timespec ts;
537 u32 nbytes;
538 __be32 *p;
539
540 /*
541 * In order to make only a single xdr_reserve_space() call,
542 * pre-compute the total number of bytes to be reserved.
543 * Six boolean values, one for each set_foo field, are always
544 * present in the encoded result, so start there.
545 */
546 nbytes = 6 * 4;
547 if (attr->ia_valid & ATTR_MODE)
548 nbytes += 4;
549 if (attr->ia_valid & ATTR_UID)
550 nbytes += 4;
551 if (attr->ia_valid & ATTR_GID)
552 nbytes += 4;
553 if (attr->ia_valid & ATTR_SIZE)
554 nbytes += 8;
555 if (attr->ia_valid & ATTR_ATIME_SET)
556 nbytes += 8;
557 if (attr->ia_valid & ATTR_MTIME_SET)
558 nbytes += 8;
559 p = xdr_reserve_space(xdr, nbytes);
560
561 if (attr->ia_valid & ATTR_MODE) {
562 *p++ = xdr_one;
563 *p++ = cpu_to_be32(attr->ia_mode & S_IALLUGO);
564 } else
565 *p++ = xdr_zero;
566
567 if (attr->ia_valid & ATTR_UID) {
568 *p++ = xdr_one;
569 *p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
570 } else
571 *p++ = xdr_zero;
572
573 if (attr->ia_valid & ATTR_GID) {
574 *p++ = xdr_one;
575 *p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
576 } else
577 *p++ = xdr_zero;
578
579 if (attr->ia_valid & ATTR_SIZE) {
580 *p++ = xdr_one;
581 p = xdr_encode_hyper(p, (u64)attr->ia_size);
582 } else
583 *p++ = xdr_zero;
584
585 if (attr->ia_valid & ATTR_ATIME_SET) {
586 struct timespec ts;
587 *p++ = xdr_two;
588 ts = timespec64_to_timespec(attr->ia_atime);
589 p = xdr_encode_nfstime3(p, &ts);
590 } else if (attr->ia_valid & ATTR_ATIME) {
591 *p++ = xdr_one;
592 } else
593 *p++ = xdr_zero;
594
595 if (attr->ia_valid & ATTR_MTIME_SET) {
596 *p++ = xdr_two;
597 ts = timespec64_to_timespec(attr->ia_mtime);
598 xdr_encode_nfstime3(p, &ts);
599 } else if (attr->ia_valid & ATTR_MTIME) {
600 *p = xdr_one;
601 } else
602 *p = xdr_zero;
603 }
604
605 /*
606 * fattr3
607 *
608 * struct fattr3 {
609 * ftype3 type;
610 * mode3 mode;
611 * uint32 nlink;
612 * uid3 uid;
613 * gid3 gid;
614 * size3 size;
615 * size3 used;
616 * specdata3 rdev;
617 * uint64 fsid;
618 * fileid3 fileid;
619 * nfstime3 atime;
620 * nfstime3 mtime;
621 * nfstime3 ctime;
622 * };
623 */
decode_fattr3(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)624 static int decode_fattr3(struct xdr_stream *xdr, struct nfs_fattr *fattr,
625 struct user_namespace *userns)
626 {
627 umode_t fmode;
628 __be32 *p;
629
630 p = xdr_inline_decode(xdr, NFS3_fattr_sz << 2);
631 if (unlikely(!p))
632 return -EIO;
633
634 p = xdr_decode_ftype3(p, &fmode);
635
636 fattr->mode = (be32_to_cpup(p++) & ~S_IFMT) | fmode;
637 fattr->nlink = be32_to_cpup(p++);
638 fattr->uid = make_kuid(userns, be32_to_cpup(p++));
639 if (!uid_valid(fattr->uid))
640 goto out_uid;
641 fattr->gid = make_kgid(userns, be32_to_cpup(p++));
642 if (!gid_valid(fattr->gid))
643 goto out_gid;
644
645 p = xdr_decode_size3(p, &fattr->size);
646 p = xdr_decode_size3(p, &fattr->du.nfs3.used);
647 p = xdr_decode_specdata3(p, &fattr->rdev);
648
649 p = xdr_decode_hyper(p, &fattr->fsid.major);
650 fattr->fsid.minor = 0;
651
652 p = xdr_decode_fileid3(p, &fattr->fileid);
653 p = xdr_decode_nfstime3(p, &fattr->atime);
654 p = xdr_decode_nfstime3(p, &fattr->mtime);
655 xdr_decode_nfstime3(p, &fattr->ctime);
656 fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime);
657
658 fattr->valid |= NFS_ATTR_FATTR_V3;
659 return 0;
660 out_uid:
661 dprintk("NFS: returned invalid uid\n");
662 return -EINVAL;
663 out_gid:
664 dprintk("NFS: returned invalid gid\n");
665 return -EINVAL;
666 }
667
668 /*
669 * post_op_attr
670 *
671 * union post_op_attr switch (bool attributes_follow) {
672 * case TRUE:
673 * fattr3 attributes;
674 * case FALSE:
675 * void;
676 * };
677 */
decode_post_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)678 static int decode_post_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
679 struct user_namespace *userns)
680 {
681 __be32 *p;
682
683 p = xdr_inline_decode(xdr, 4);
684 if (unlikely(!p))
685 return -EIO;
686 if (*p != xdr_zero)
687 return decode_fattr3(xdr, fattr, userns);
688 return 0;
689 }
690
691 /*
692 * wcc_attr
693 * struct wcc_attr {
694 * size3 size;
695 * nfstime3 mtime;
696 * nfstime3 ctime;
697 * };
698 */
decode_wcc_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)699 static int decode_wcc_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
700 {
701 __be32 *p;
702
703 p = xdr_inline_decode(xdr, NFS3_wcc_attr_sz << 2);
704 if (unlikely(!p))
705 return -EIO;
706
707 fattr->valid |= NFS_ATTR_FATTR_PRESIZE
708 | NFS_ATTR_FATTR_PRECHANGE
709 | NFS_ATTR_FATTR_PREMTIME
710 | NFS_ATTR_FATTR_PRECTIME;
711
712 p = xdr_decode_size3(p, &fattr->pre_size);
713 p = xdr_decode_nfstime3(p, &fattr->pre_mtime);
714 xdr_decode_nfstime3(p, &fattr->pre_ctime);
715 fattr->pre_change_attr = nfs_timespec_to_change_attr(&fattr->pre_ctime);
716
717 return 0;
718 }
719
720 /*
721 * pre_op_attr
722 * union pre_op_attr switch (bool attributes_follow) {
723 * case TRUE:
724 * wcc_attr attributes;
725 * case FALSE:
726 * void;
727 * };
728 *
729 * wcc_data
730 *
731 * struct wcc_data {
732 * pre_op_attr before;
733 * post_op_attr after;
734 * };
735 */
decode_pre_op_attr(struct xdr_stream * xdr,struct nfs_fattr * fattr)736 static int decode_pre_op_attr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
737 {
738 __be32 *p;
739
740 p = xdr_inline_decode(xdr, 4);
741 if (unlikely(!p))
742 return -EIO;
743 if (*p != xdr_zero)
744 return decode_wcc_attr(xdr, fattr);
745 return 0;
746 }
747
decode_wcc_data(struct xdr_stream * xdr,struct nfs_fattr * fattr,struct user_namespace * userns)748 static int decode_wcc_data(struct xdr_stream *xdr, struct nfs_fattr *fattr,
749 struct user_namespace *userns)
750 {
751 int error;
752
753 error = decode_pre_op_attr(xdr, fattr);
754 if (unlikely(error))
755 goto out;
756 error = decode_post_op_attr(xdr, fattr, userns);
757 out:
758 return error;
759 }
760
761 /*
762 * post_op_fh3
763 *
764 * union post_op_fh3 switch (bool handle_follows) {
765 * case TRUE:
766 * nfs_fh3 handle;
767 * case FALSE:
768 * void;
769 * };
770 */
decode_post_op_fh3(struct xdr_stream * xdr,struct nfs_fh * fh)771 static int decode_post_op_fh3(struct xdr_stream *xdr, struct nfs_fh *fh)
772 {
773 __be32 *p = xdr_inline_decode(xdr, 4);
774 if (unlikely(!p))
775 return -EIO;
776 if (*p != xdr_zero)
777 return decode_nfs_fh3(xdr, fh);
778 zero_nfs_fh3(fh);
779 return 0;
780 }
781
782 /*
783 * diropargs3
784 *
785 * struct diropargs3 {
786 * nfs_fh3 dir;
787 * filename3 name;
788 * };
789 */
encode_diropargs3(struct xdr_stream * xdr,const struct nfs_fh * fh,const char * name,u32 length)790 static void encode_diropargs3(struct xdr_stream *xdr, const struct nfs_fh *fh,
791 const char *name, u32 length)
792 {
793 encode_nfs_fh3(xdr, fh);
794 encode_filename3(xdr, name, length);
795 }
796
797
798 /*
799 * NFSv3 XDR encode functions
800 *
801 * NFSv3 argument types are defined in section 3.3 of RFC 1813:
802 * "NFS Version 3 Protocol Specification".
803 */
804
805 /*
806 * 3.3.1 GETATTR3args
807 *
808 * struct GETATTR3args {
809 * nfs_fh3 object;
810 * };
811 */
nfs3_xdr_enc_getattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)812 static void nfs3_xdr_enc_getattr3args(struct rpc_rqst *req,
813 struct xdr_stream *xdr,
814 const void *data)
815 {
816 const struct nfs_fh *fh = data;
817
818 encode_nfs_fh3(xdr, fh);
819 }
820
821 /*
822 * 3.3.2 SETATTR3args
823 *
824 * union sattrguard3 switch (bool check) {
825 * case TRUE:
826 * nfstime3 obj_ctime;
827 * case FALSE:
828 * void;
829 * };
830 *
831 * struct SETATTR3args {
832 * nfs_fh3 object;
833 * sattr3 new_attributes;
834 * sattrguard3 guard;
835 * };
836 */
encode_sattrguard3(struct xdr_stream * xdr,const struct nfs3_sattrargs * args)837 static void encode_sattrguard3(struct xdr_stream *xdr,
838 const struct nfs3_sattrargs *args)
839 {
840 __be32 *p;
841
842 if (args->guard) {
843 p = xdr_reserve_space(xdr, 4 + 8);
844 *p++ = xdr_one;
845 xdr_encode_nfstime3(p, &args->guardtime);
846 } else {
847 p = xdr_reserve_space(xdr, 4);
848 *p = xdr_zero;
849 }
850 }
851
nfs3_xdr_enc_setattr3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)852 static void nfs3_xdr_enc_setattr3args(struct rpc_rqst *req,
853 struct xdr_stream *xdr,
854 const void *data)
855 {
856 const struct nfs3_sattrargs *args = data;
857 encode_nfs_fh3(xdr, args->fh);
858 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
859 encode_sattrguard3(xdr, args);
860 }
861
862 /*
863 * 3.3.3 LOOKUP3args
864 *
865 * struct LOOKUP3args {
866 * diropargs3 what;
867 * };
868 */
nfs3_xdr_enc_lookup3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)869 static void nfs3_xdr_enc_lookup3args(struct rpc_rqst *req,
870 struct xdr_stream *xdr,
871 const void *data)
872 {
873 const struct nfs3_diropargs *args = data;
874
875 encode_diropargs3(xdr, args->fh, args->name, args->len);
876 }
877
878 /*
879 * 3.3.4 ACCESS3args
880 *
881 * struct ACCESS3args {
882 * nfs_fh3 object;
883 * uint32 access;
884 * };
885 */
encode_access3args(struct xdr_stream * xdr,const struct nfs3_accessargs * args)886 static void encode_access3args(struct xdr_stream *xdr,
887 const struct nfs3_accessargs *args)
888 {
889 encode_nfs_fh3(xdr, args->fh);
890 encode_uint32(xdr, args->access);
891 }
892
nfs3_xdr_enc_access3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)893 static void nfs3_xdr_enc_access3args(struct rpc_rqst *req,
894 struct xdr_stream *xdr,
895 const void *data)
896 {
897 const struct nfs3_accessargs *args = data;
898
899 encode_access3args(xdr, args);
900 }
901
902 /*
903 * 3.3.5 READLINK3args
904 *
905 * struct READLINK3args {
906 * nfs_fh3 symlink;
907 * };
908 */
nfs3_xdr_enc_readlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)909 static void nfs3_xdr_enc_readlink3args(struct rpc_rqst *req,
910 struct xdr_stream *xdr,
911 const void *data)
912 {
913 const struct nfs3_readlinkargs *args = data;
914
915 encode_nfs_fh3(xdr, args->fh);
916 rpc_prepare_reply_pages(req, args->pages, args->pgbase,
917 args->pglen, NFS3_readlinkres_sz);
918 }
919
920 /*
921 * 3.3.6 READ3args
922 *
923 * struct READ3args {
924 * nfs_fh3 file;
925 * offset3 offset;
926 * count3 count;
927 * };
928 */
encode_read3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)929 static void encode_read3args(struct xdr_stream *xdr,
930 const struct nfs_pgio_args *args)
931 {
932 __be32 *p;
933
934 encode_nfs_fh3(xdr, args->fh);
935
936 p = xdr_reserve_space(xdr, 8 + 4);
937 p = xdr_encode_hyper(p, args->offset);
938 *p = cpu_to_be32(args->count);
939 }
940
nfs3_xdr_enc_read3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)941 static void nfs3_xdr_enc_read3args(struct rpc_rqst *req,
942 struct xdr_stream *xdr,
943 const void *data)
944 {
945 const struct nfs_pgio_args *args = data;
946 unsigned int replen = args->replen ? args->replen : NFS3_readres_sz;
947
948 encode_read3args(xdr, args);
949 rpc_prepare_reply_pages(req, args->pages, args->pgbase,
950 args->count, replen);
951 req->rq_rcv_buf.flags |= XDRBUF_READ;
952 }
953
954 /*
955 * 3.3.7 WRITE3args
956 *
957 * enum stable_how {
958 * UNSTABLE = 0,
959 * DATA_SYNC = 1,
960 * FILE_SYNC = 2
961 * };
962 *
963 * struct WRITE3args {
964 * nfs_fh3 file;
965 * offset3 offset;
966 * count3 count;
967 * stable_how stable;
968 * opaque data<>;
969 * };
970 */
encode_write3args(struct xdr_stream * xdr,const struct nfs_pgio_args * args)971 static void encode_write3args(struct xdr_stream *xdr,
972 const struct nfs_pgio_args *args)
973 {
974 __be32 *p;
975
976 encode_nfs_fh3(xdr, args->fh);
977
978 p = xdr_reserve_space(xdr, 8 + 4 + 4 + 4);
979 p = xdr_encode_hyper(p, args->offset);
980 *p++ = cpu_to_be32(args->count);
981 *p++ = cpu_to_be32(args->stable);
982 *p = cpu_to_be32(args->count);
983 xdr_write_pages(xdr, args->pages, args->pgbase, args->count);
984 }
985
nfs3_xdr_enc_write3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)986 static void nfs3_xdr_enc_write3args(struct rpc_rqst *req,
987 struct xdr_stream *xdr,
988 const void *data)
989 {
990 const struct nfs_pgio_args *args = data;
991
992 encode_write3args(xdr, args);
993 xdr->buf->flags |= XDRBUF_WRITE;
994 }
995
996 /*
997 * 3.3.8 CREATE3args
998 *
999 * enum createmode3 {
1000 * UNCHECKED = 0,
1001 * GUARDED = 1,
1002 * EXCLUSIVE = 2
1003 * };
1004 *
1005 * union createhow3 switch (createmode3 mode) {
1006 * case UNCHECKED:
1007 * case GUARDED:
1008 * sattr3 obj_attributes;
1009 * case EXCLUSIVE:
1010 * createverf3 verf;
1011 * };
1012 *
1013 * struct CREATE3args {
1014 * diropargs3 where;
1015 * createhow3 how;
1016 * };
1017 */
encode_createhow3(struct xdr_stream * xdr,const struct nfs3_createargs * args,struct user_namespace * userns)1018 static void encode_createhow3(struct xdr_stream *xdr,
1019 const struct nfs3_createargs *args,
1020 struct user_namespace *userns)
1021 {
1022 encode_uint32(xdr, args->createmode);
1023 switch (args->createmode) {
1024 case NFS3_CREATE_UNCHECKED:
1025 case NFS3_CREATE_GUARDED:
1026 encode_sattr3(xdr, args->sattr, userns);
1027 break;
1028 case NFS3_CREATE_EXCLUSIVE:
1029 encode_createverf3(xdr, args->verifier);
1030 break;
1031 default:
1032 BUG();
1033 }
1034 }
1035
nfs3_xdr_enc_create3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1036 static void nfs3_xdr_enc_create3args(struct rpc_rqst *req,
1037 struct xdr_stream *xdr,
1038 const void *data)
1039 {
1040 const struct nfs3_createargs *args = data;
1041
1042 encode_diropargs3(xdr, args->fh, args->name, args->len);
1043 encode_createhow3(xdr, args, rpc_rqst_userns(req));
1044 }
1045
1046 /*
1047 * 3.3.9 MKDIR3args
1048 *
1049 * struct MKDIR3args {
1050 * diropargs3 where;
1051 * sattr3 attributes;
1052 * };
1053 */
nfs3_xdr_enc_mkdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1054 static void nfs3_xdr_enc_mkdir3args(struct rpc_rqst *req,
1055 struct xdr_stream *xdr,
1056 const void *data)
1057 {
1058 const struct nfs3_mkdirargs *args = data;
1059
1060 encode_diropargs3(xdr, args->fh, args->name, args->len);
1061 encode_sattr3(xdr, args->sattr, rpc_rqst_userns(req));
1062 }
1063
1064 /*
1065 * 3.3.10 SYMLINK3args
1066 *
1067 * struct symlinkdata3 {
1068 * sattr3 symlink_attributes;
1069 * nfspath3 symlink_data;
1070 * };
1071 *
1072 * struct SYMLINK3args {
1073 * diropargs3 where;
1074 * symlinkdata3 symlink;
1075 * };
1076 */
encode_symlinkdata3(struct xdr_stream * xdr,const void * data,struct user_namespace * userns)1077 static void encode_symlinkdata3(struct xdr_stream *xdr,
1078 const void *data,
1079 struct user_namespace *userns)
1080 {
1081 const struct nfs3_symlinkargs *args = data;
1082
1083 encode_sattr3(xdr, args->sattr, userns);
1084 encode_nfspath3(xdr, args->pages, args->pathlen);
1085 }
1086
nfs3_xdr_enc_symlink3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1087 static void nfs3_xdr_enc_symlink3args(struct rpc_rqst *req,
1088 struct xdr_stream *xdr,
1089 const void *data)
1090 {
1091 const struct nfs3_symlinkargs *args = data;
1092
1093 encode_diropargs3(xdr, args->fromfh, args->fromname, args->fromlen);
1094 encode_symlinkdata3(xdr, args, rpc_rqst_userns(req));
1095 xdr->buf->flags |= XDRBUF_WRITE;
1096 }
1097
1098 /*
1099 * 3.3.11 MKNOD3args
1100 *
1101 * struct devicedata3 {
1102 * sattr3 dev_attributes;
1103 * specdata3 spec;
1104 * };
1105 *
1106 * union mknoddata3 switch (ftype3 type) {
1107 * case NF3CHR:
1108 * case NF3BLK:
1109 * devicedata3 device;
1110 * case NF3SOCK:
1111 * case NF3FIFO:
1112 * sattr3 pipe_attributes;
1113 * default:
1114 * void;
1115 * };
1116 *
1117 * struct MKNOD3args {
1118 * diropargs3 where;
1119 * mknoddata3 what;
1120 * };
1121 */
encode_devicedata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args,struct user_namespace * userns)1122 static void encode_devicedata3(struct xdr_stream *xdr,
1123 const struct nfs3_mknodargs *args,
1124 struct user_namespace *userns)
1125 {
1126 encode_sattr3(xdr, args->sattr, userns);
1127 encode_specdata3(xdr, args->rdev);
1128 }
1129
encode_mknoddata3(struct xdr_stream * xdr,const struct nfs3_mknodargs * args,struct user_namespace * userns)1130 static void encode_mknoddata3(struct xdr_stream *xdr,
1131 const struct nfs3_mknodargs *args,
1132 struct user_namespace *userns)
1133 {
1134 encode_ftype3(xdr, args->type);
1135 switch (args->type) {
1136 case NF3CHR:
1137 case NF3BLK:
1138 encode_devicedata3(xdr, args, userns);
1139 break;
1140 case NF3SOCK:
1141 case NF3FIFO:
1142 encode_sattr3(xdr, args->sattr, userns);
1143 break;
1144 case NF3REG:
1145 case NF3DIR:
1146 break;
1147 default:
1148 BUG();
1149 }
1150 }
1151
nfs3_xdr_enc_mknod3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1152 static void nfs3_xdr_enc_mknod3args(struct rpc_rqst *req,
1153 struct xdr_stream *xdr,
1154 const void *data)
1155 {
1156 const struct nfs3_mknodargs *args = data;
1157
1158 encode_diropargs3(xdr, args->fh, args->name, args->len);
1159 encode_mknoddata3(xdr, args, rpc_rqst_userns(req));
1160 }
1161
1162 /*
1163 * 3.3.12 REMOVE3args
1164 *
1165 * struct REMOVE3args {
1166 * diropargs3 object;
1167 * };
1168 */
nfs3_xdr_enc_remove3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1169 static void nfs3_xdr_enc_remove3args(struct rpc_rqst *req,
1170 struct xdr_stream *xdr,
1171 const void *data)
1172 {
1173 const struct nfs_removeargs *args = data;
1174
1175 encode_diropargs3(xdr, args->fh, args->name.name, args->name.len);
1176 }
1177
1178 /*
1179 * 3.3.14 RENAME3args
1180 *
1181 * struct RENAME3args {
1182 * diropargs3 from;
1183 * diropargs3 to;
1184 * };
1185 */
nfs3_xdr_enc_rename3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1186 static void nfs3_xdr_enc_rename3args(struct rpc_rqst *req,
1187 struct xdr_stream *xdr,
1188 const void *data)
1189 {
1190 const struct nfs_renameargs *args = data;
1191 const struct qstr *old = args->old_name;
1192 const struct qstr *new = args->new_name;
1193
1194 encode_diropargs3(xdr, args->old_dir, old->name, old->len);
1195 encode_diropargs3(xdr, args->new_dir, new->name, new->len);
1196 }
1197
1198 /*
1199 * 3.3.15 LINK3args
1200 *
1201 * struct LINK3args {
1202 * nfs_fh3 file;
1203 * diropargs3 link;
1204 * };
1205 */
nfs3_xdr_enc_link3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1206 static void nfs3_xdr_enc_link3args(struct rpc_rqst *req,
1207 struct xdr_stream *xdr,
1208 const void *data)
1209 {
1210 const struct nfs3_linkargs *args = data;
1211
1212 encode_nfs_fh3(xdr, args->fromfh);
1213 encode_diropargs3(xdr, args->tofh, args->toname, args->tolen);
1214 }
1215
1216 /*
1217 * 3.3.16 READDIR3args
1218 *
1219 * struct READDIR3args {
1220 * nfs_fh3 dir;
1221 * cookie3 cookie;
1222 * cookieverf3 cookieverf;
1223 * count3 count;
1224 * };
1225 */
encode_readdir3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1226 static void encode_readdir3args(struct xdr_stream *xdr,
1227 const struct nfs3_readdirargs *args)
1228 {
1229 __be32 *p;
1230
1231 encode_nfs_fh3(xdr, args->fh);
1232
1233 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4);
1234 p = xdr_encode_cookie3(p, args->cookie);
1235 p = xdr_encode_cookieverf3(p, args->verf);
1236 *p = cpu_to_be32(args->count);
1237 }
1238
nfs3_xdr_enc_readdir3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1239 static void nfs3_xdr_enc_readdir3args(struct rpc_rqst *req,
1240 struct xdr_stream *xdr,
1241 const void *data)
1242 {
1243 const struct nfs3_readdirargs *args = data;
1244
1245 encode_readdir3args(xdr, args);
1246 rpc_prepare_reply_pages(req, args->pages, 0,
1247 args->count, NFS3_readdirres_sz);
1248 }
1249
1250 /*
1251 * 3.3.17 READDIRPLUS3args
1252 *
1253 * struct READDIRPLUS3args {
1254 * nfs_fh3 dir;
1255 * cookie3 cookie;
1256 * cookieverf3 cookieverf;
1257 * count3 dircount;
1258 * count3 maxcount;
1259 * };
1260 */
encode_readdirplus3args(struct xdr_stream * xdr,const struct nfs3_readdirargs * args)1261 static void encode_readdirplus3args(struct xdr_stream *xdr,
1262 const struct nfs3_readdirargs *args)
1263 {
1264 __be32 *p;
1265
1266 encode_nfs_fh3(xdr, args->fh);
1267
1268 p = xdr_reserve_space(xdr, 8 + NFS3_COOKIEVERFSIZE + 4 + 4);
1269 p = xdr_encode_cookie3(p, args->cookie);
1270 p = xdr_encode_cookieverf3(p, args->verf);
1271
1272 /*
1273 * readdirplus: need dircount + buffer size.
1274 * We just make sure we make dircount big enough
1275 */
1276 *p++ = cpu_to_be32(args->count >> 3);
1277
1278 *p = cpu_to_be32(args->count);
1279 }
1280
nfs3_xdr_enc_readdirplus3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1281 static void nfs3_xdr_enc_readdirplus3args(struct rpc_rqst *req,
1282 struct xdr_stream *xdr,
1283 const void *data)
1284 {
1285 const struct nfs3_readdirargs *args = data;
1286
1287 encode_readdirplus3args(xdr, args);
1288 rpc_prepare_reply_pages(req, args->pages, 0,
1289 args->count, NFS3_readdirres_sz);
1290 }
1291
1292 /*
1293 * 3.3.21 COMMIT3args
1294 *
1295 * struct COMMIT3args {
1296 * nfs_fh3 file;
1297 * offset3 offset;
1298 * count3 count;
1299 * };
1300 */
encode_commit3args(struct xdr_stream * xdr,const struct nfs_commitargs * args)1301 static void encode_commit3args(struct xdr_stream *xdr,
1302 const struct nfs_commitargs *args)
1303 {
1304 __be32 *p;
1305
1306 encode_nfs_fh3(xdr, args->fh);
1307
1308 p = xdr_reserve_space(xdr, 8 + 4);
1309 p = xdr_encode_hyper(p, args->offset);
1310 *p = cpu_to_be32(args->count);
1311 }
1312
nfs3_xdr_enc_commit3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1313 static void nfs3_xdr_enc_commit3args(struct rpc_rqst *req,
1314 struct xdr_stream *xdr,
1315 const void *data)
1316 {
1317 const struct nfs_commitargs *args = data;
1318
1319 encode_commit3args(xdr, args);
1320 }
1321
1322 #ifdef CONFIG_NFS_V3_ACL
1323
nfs3_xdr_enc_getacl3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1324 static void nfs3_xdr_enc_getacl3args(struct rpc_rqst *req,
1325 struct xdr_stream *xdr,
1326 const void *data)
1327 {
1328 const struct nfs3_getaclargs *args = data;
1329
1330 encode_nfs_fh3(xdr, args->fh);
1331 encode_uint32(xdr, args->mask);
1332 if (args->mask & (NFS_ACL | NFS_DFACL)) {
1333 rpc_prepare_reply_pages(req, args->pages, 0,
1334 NFSACL_MAXPAGES << PAGE_SHIFT,
1335 ACL3_getaclres_sz);
1336 req->rq_rcv_buf.flags |= XDRBUF_SPARSE_PAGES;
1337 }
1338 }
1339
nfs3_xdr_enc_setacl3args(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)1340 static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req,
1341 struct xdr_stream *xdr,
1342 const void *data)
1343 {
1344 const struct nfs3_setaclargs *args = data;
1345 unsigned int base;
1346 int error;
1347
1348 encode_nfs_fh3(xdr, NFS_FH(args->inode));
1349 encode_uint32(xdr, args->mask);
1350
1351 base = req->rq_slen;
1352 if (args->npages != 0)
1353 xdr_write_pages(xdr, args->pages, 0, args->len);
1354 else
1355 xdr_reserve_space(xdr, args->len);
1356
1357 error = nfsacl_encode(xdr->buf, base, args->inode,
1358 (args->mask & NFS_ACL) ?
1359 args->acl_access : NULL, 1, 0);
1360 /* FIXME: this is just broken */
1361 BUG_ON(error < 0);
1362 error = nfsacl_encode(xdr->buf, base + error, args->inode,
1363 (args->mask & NFS_DFACL) ?
1364 args->acl_default : NULL, 1,
1365 NFS_ACL_DEFAULT);
1366 BUG_ON(error < 0);
1367 }
1368
1369 #endif /* CONFIG_NFS_V3_ACL */
1370
1371 /*
1372 * NFSv3 XDR decode functions
1373 *
1374 * NFSv3 result types are defined in section 3.3 of RFC 1813:
1375 * "NFS Version 3 Protocol Specification".
1376 */
1377
1378 /*
1379 * 3.3.1 GETATTR3res
1380 *
1381 * struct GETATTR3resok {
1382 * fattr3 obj_attributes;
1383 * };
1384 *
1385 * union GETATTR3res switch (nfsstat3 status) {
1386 * case NFS3_OK:
1387 * GETATTR3resok resok;
1388 * default:
1389 * void;
1390 * };
1391 */
nfs3_xdr_dec_getattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1392 static int nfs3_xdr_dec_getattr3res(struct rpc_rqst *req,
1393 struct xdr_stream *xdr,
1394 void *result)
1395 {
1396 enum nfs_stat status;
1397 int error;
1398
1399 error = decode_nfsstat3(xdr, &status);
1400 if (unlikely(error))
1401 goto out;
1402 if (status != NFS3_OK)
1403 goto out_default;
1404 error = decode_fattr3(xdr, result, rpc_rqst_userns(req));
1405 out:
1406 return error;
1407 out_default:
1408 return nfs3_stat_to_errno(status);
1409 }
1410
1411 /*
1412 * 3.3.2 SETATTR3res
1413 *
1414 * struct SETATTR3resok {
1415 * wcc_data obj_wcc;
1416 * };
1417 *
1418 * struct SETATTR3resfail {
1419 * wcc_data obj_wcc;
1420 * };
1421 *
1422 * union SETATTR3res switch (nfsstat3 status) {
1423 * case NFS3_OK:
1424 * SETATTR3resok resok;
1425 * default:
1426 * SETATTR3resfail resfail;
1427 * };
1428 */
nfs3_xdr_dec_setattr3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1429 static int nfs3_xdr_dec_setattr3res(struct rpc_rqst *req,
1430 struct xdr_stream *xdr,
1431 void *result)
1432 {
1433 enum nfs_stat status;
1434 int error;
1435
1436 error = decode_nfsstat3(xdr, &status);
1437 if (unlikely(error))
1438 goto out;
1439 error = decode_wcc_data(xdr, result, rpc_rqst_userns(req));
1440 if (unlikely(error))
1441 goto out;
1442 if (status != NFS3_OK)
1443 goto out_status;
1444 out:
1445 return error;
1446 out_status:
1447 return nfs3_stat_to_errno(status);
1448 }
1449
1450 /*
1451 * 3.3.3 LOOKUP3res
1452 *
1453 * struct LOOKUP3resok {
1454 * nfs_fh3 object;
1455 * post_op_attr obj_attributes;
1456 * post_op_attr dir_attributes;
1457 * };
1458 *
1459 * struct LOOKUP3resfail {
1460 * post_op_attr dir_attributes;
1461 * };
1462 *
1463 * union LOOKUP3res switch (nfsstat3 status) {
1464 * case NFS3_OK:
1465 * LOOKUP3resok resok;
1466 * default:
1467 * LOOKUP3resfail resfail;
1468 * };
1469 */
nfs3_xdr_dec_lookup3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1470 static int nfs3_xdr_dec_lookup3res(struct rpc_rqst *req,
1471 struct xdr_stream *xdr,
1472 void *data)
1473 {
1474 struct user_namespace *userns = rpc_rqst_userns(req);
1475 struct nfs3_diropres *result = data;
1476 enum nfs_stat status;
1477 int error;
1478
1479 error = decode_nfsstat3(xdr, &status);
1480 if (unlikely(error))
1481 goto out;
1482 if (status != NFS3_OK)
1483 goto out_default;
1484 error = decode_nfs_fh3(xdr, result->fh);
1485 if (unlikely(error))
1486 goto out;
1487 error = decode_post_op_attr(xdr, result->fattr, userns);
1488 if (unlikely(error))
1489 goto out;
1490 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1491 out:
1492 return error;
1493 out_default:
1494 error = decode_post_op_attr(xdr, result->dir_attr, userns);
1495 if (unlikely(error))
1496 goto out;
1497 return nfs3_stat_to_errno(status);
1498 }
1499
1500 /*
1501 * 3.3.4 ACCESS3res
1502 *
1503 * struct ACCESS3resok {
1504 * post_op_attr obj_attributes;
1505 * uint32 access;
1506 * };
1507 *
1508 * struct ACCESS3resfail {
1509 * post_op_attr obj_attributes;
1510 * };
1511 *
1512 * union ACCESS3res switch (nfsstat3 status) {
1513 * case NFS3_OK:
1514 * ACCESS3resok resok;
1515 * default:
1516 * ACCESS3resfail resfail;
1517 * };
1518 */
nfs3_xdr_dec_access3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1519 static int nfs3_xdr_dec_access3res(struct rpc_rqst *req,
1520 struct xdr_stream *xdr,
1521 void *data)
1522 {
1523 struct nfs3_accessres *result = data;
1524 enum nfs_stat status;
1525 int error;
1526
1527 error = decode_nfsstat3(xdr, &status);
1528 if (unlikely(error))
1529 goto out;
1530 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1531 if (unlikely(error))
1532 goto out;
1533 if (status != NFS3_OK)
1534 goto out_default;
1535 error = decode_uint32(xdr, &result->access);
1536 out:
1537 return error;
1538 out_default:
1539 return nfs3_stat_to_errno(status);
1540 }
1541
1542 /*
1543 * 3.3.5 READLINK3res
1544 *
1545 * struct READLINK3resok {
1546 * post_op_attr symlink_attributes;
1547 * nfspath3 data;
1548 * };
1549 *
1550 * struct READLINK3resfail {
1551 * post_op_attr symlink_attributes;
1552 * };
1553 *
1554 * union READLINK3res switch (nfsstat3 status) {
1555 * case NFS3_OK:
1556 * READLINK3resok resok;
1557 * default:
1558 * READLINK3resfail resfail;
1559 * };
1560 */
nfs3_xdr_dec_readlink3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)1561 static int nfs3_xdr_dec_readlink3res(struct rpc_rqst *req,
1562 struct xdr_stream *xdr,
1563 void *result)
1564 {
1565 enum nfs_stat status;
1566 int error;
1567
1568 error = decode_nfsstat3(xdr, &status);
1569 if (unlikely(error))
1570 goto out;
1571 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
1572 if (unlikely(error))
1573 goto out;
1574 if (status != NFS3_OK)
1575 goto out_default;
1576 error = decode_nfspath3(xdr);
1577 out:
1578 return error;
1579 out_default:
1580 return nfs3_stat_to_errno(status);
1581 }
1582
1583 /*
1584 * 3.3.6 READ3res
1585 *
1586 * struct READ3resok {
1587 * post_op_attr file_attributes;
1588 * count3 count;
1589 * bool eof;
1590 * opaque data<>;
1591 * };
1592 *
1593 * struct READ3resfail {
1594 * post_op_attr file_attributes;
1595 * };
1596 *
1597 * union READ3res switch (nfsstat3 status) {
1598 * case NFS3_OK:
1599 * READ3resok resok;
1600 * default:
1601 * READ3resfail resfail;
1602 * };
1603 */
decode_read3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1604 static int decode_read3resok(struct xdr_stream *xdr,
1605 struct nfs_pgio_res *result)
1606 {
1607 u32 eof, count, ocount, recvd;
1608 __be32 *p;
1609
1610 p = xdr_inline_decode(xdr, 4 + 4 + 4);
1611 if (unlikely(!p))
1612 return -EIO;
1613 count = be32_to_cpup(p++);
1614 eof = be32_to_cpup(p++);
1615 ocount = be32_to_cpup(p++);
1616 if (unlikely(ocount != count))
1617 goto out_mismatch;
1618 recvd = xdr_read_pages(xdr, count);
1619 if (unlikely(count > recvd))
1620 goto out_cheating;
1621 out:
1622 result->eof = eof;
1623 result->count = count;
1624 return count;
1625 out_mismatch:
1626 dprintk("NFS: READ count doesn't match length of opaque: "
1627 "count %u != ocount %u\n", count, ocount);
1628 return -EIO;
1629 out_cheating:
1630 dprintk("NFS: server cheating in read result: "
1631 "count %u > recvd %u\n", count, recvd);
1632 count = recvd;
1633 eof = 0;
1634 goto out;
1635 }
1636
nfs3_xdr_dec_read3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1637 static int nfs3_xdr_dec_read3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1638 void *data)
1639 {
1640 struct nfs_pgio_res *result = data;
1641 unsigned int pos;
1642 enum nfs_stat status;
1643 int error;
1644
1645 pos = xdr_stream_pos(xdr);
1646 error = decode_nfsstat3(xdr, &status);
1647 if (unlikely(error))
1648 goto out;
1649 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
1650 if (unlikely(error))
1651 goto out;
1652 result->op_status = status;
1653 if (status != NFS3_OK)
1654 goto out_status;
1655 result->replen = 4 + ((xdr_stream_pos(xdr) - pos) >> 2);
1656 error = decode_read3resok(xdr, result);
1657 out:
1658 return error;
1659 out_status:
1660 return nfs3_stat_to_errno(status);
1661 }
1662
1663 /*
1664 * 3.3.7 WRITE3res
1665 *
1666 * enum stable_how {
1667 * UNSTABLE = 0,
1668 * DATA_SYNC = 1,
1669 * FILE_SYNC = 2
1670 * };
1671 *
1672 * struct WRITE3resok {
1673 * wcc_data file_wcc;
1674 * count3 count;
1675 * stable_how committed;
1676 * writeverf3 verf;
1677 * };
1678 *
1679 * struct WRITE3resfail {
1680 * wcc_data file_wcc;
1681 * };
1682 *
1683 * union WRITE3res switch (nfsstat3 status) {
1684 * case NFS3_OK:
1685 * WRITE3resok resok;
1686 * default:
1687 * WRITE3resfail resfail;
1688 * };
1689 */
decode_write3resok(struct xdr_stream * xdr,struct nfs_pgio_res * result)1690 static int decode_write3resok(struct xdr_stream *xdr,
1691 struct nfs_pgio_res *result)
1692 {
1693 __be32 *p;
1694
1695 p = xdr_inline_decode(xdr, 4 + 4);
1696 if (unlikely(!p))
1697 return -EIO;
1698 result->count = be32_to_cpup(p++);
1699 result->verf->committed = be32_to_cpup(p++);
1700 if (unlikely(result->verf->committed > NFS_FILE_SYNC))
1701 goto out_badvalue;
1702 if (decode_writeverf3(xdr, &result->verf->verifier))
1703 return -EIO;
1704 return result->count;
1705 out_badvalue:
1706 dprintk("NFS: bad stable_how value: %u\n", result->verf->committed);
1707 return -EIO;
1708 }
1709
nfs3_xdr_dec_write3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1710 static int nfs3_xdr_dec_write3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1711 void *data)
1712 {
1713 struct nfs_pgio_res *result = data;
1714 enum nfs_stat status;
1715 int error;
1716
1717 error = decode_nfsstat3(xdr, &status);
1718 if (unlikely(error))
1719 goto out;
1720 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
1721 if (unlikely(error))
1722 goto out;
1723 result->op_status = status;
1724 if (status != NFS3_OK)
1725 goto out_status;
1726 error = decode_write3resok(xdr, result);
1727 out:
1728 return error;
1729 out_status:
1730 return nfs3_stat_to_errno(status);
1731 }
1732
1733 /*
1734 * 3.3.8 CREATE3res
1735 *
1736 * struct CREATE3resok {
1737 * post_op_fh3 obj;
1738 * post_op_attr obj_attributes;
1739 * wcc_data dir_wcc;
1740 * };
1741 *
1742 * struct CREATE3resfail {
1743 * wcc_data dir_wcc;
1744 * };
1745 *
1746 * union CREATE3res switch (nfsstat3 status) {
1747 * case NFS3_OK:
1748 * CREATE3resok resok;
1749 * default:
1750 * CREATE3resfail resfail;
1751 * };
1752 */
decode_create3resok(struct xdr_stream * xdr,struct nfs3_diropres * result,struct user_namespace * userns)1753 static int decode_create3resok(struct xdr_stream *xdr,
1754 struct nfs3_diropres *result,
1755 struct user_namespace *userns)
1756 {
1757 int error;
1758
1759 error = decode_post_op_fh3(xdr, result->fh);
1760 if (unlikely(error))
1761 goto out;
1762 error = decode_post_op_attr(xdr, result->fattr, userns);
1763 if (unlikely(error))
1764 goto out;
1765 /* The server isn't required to return a file handle.
1766 * If it didn't, force the client to perform a LOOKUP
1767 * to determine the correct file handle and attribute
1768 * values for the new object. */
1769 if (result->fh->size == 0)
1770 result->fattr->valid = 0;
1771 error = decode_wcc_data(xdr, result->dir_attr, userns);
1772 out:
1773 return error;
1774 }
1775
nfs3_xdr_dec_create3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1776 static int nfs3_xdr_dec_create3res(struct rpc_rqst *req,
1777 struct xdr_stream *xdr,
1778 void *data)
1779 {
1780 struct user_namespace *userns = rpc_rqst_userns(req);
1781 struct nfs3_diropres *result = data;
1782 enum nfs_stat status;
1783 int error;
1784
1785 error = decode_nfsstat3(xdr, &status);
1786 if (unlikely(error))
1787 goto out;
1788 if (status != NFS3_OK)
1789 goto out_default;
1790 error = decode_create3resok(xdr, result, userns);
1791 out:
1792 return error;
1793 out_default:
1794 error = decode_wcc_data(xdr, result->dir_attr, userns);
1795 if (unlikely(error))
1796 goto out;
1797 return nfs3_stat_to_errno(status);
1798 }
1799
1800 /*
1801 * 3.3.12 REMOVE3res
1802 *
1803 * struct REMOVE3resok {
1804 * wcc_data dir_wcc;
1805 * };
1806 *
1807 * struct REMOVE3resfail {
1808 * wcc_data dir_wcc;
1809 * };
1810 *
1811 * union REMOVE3res switch (nfsstat3 status) {
1812 * case NFS3_OK:
1813 * REMOVE3resok resok;
1814 * default:
1815 * REMOVE3resfail resfail;
1816 * };
1817 */
nfs3_xdr_dec_remove3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1818 static int nfs3_xdr_dec_remove3res(struct rpc_rqst *req,
1819 struct xdr_stream *xdr,
1820 void *data)
1821 {
1822 struct nfs_removeres *result = data;
1823 enum nfs_stat status;
1824 int error;
1825
1826 error = decode_nfsstat3(xdr, &status);
1827 if (unlikely(error))
1828 goto out;
1829 error = decode_wcc_data(xdr, result->dir_attr, rpc_rqst_userns(req));
1830 if (unlikely(error))
1831 goto out;
1832 if (status != NFS3_OK)
1833 goto out_status;
1834 out:
1835 return error;
1836 out_status:
1837 return nfs3_stat_to_errno(status);
1838 }
1839
1840 /*
1841 * 3.3.14 RENAME3res
1842 *
1843 * struct RENAME3resok {
1844 * wcc_data fromdir_wcc;
1845 * wcc_data todir_wcc;
1846 * };
1847 *
1848 * struct RENAME3resfail {
1849 * wcc_data fromdir_wcc;
1850 * wcc_data todir_wcc;
1851 * };
1852 *
1853 * union RENAME3res switch (nfsstat3 status) {
1854 * case NFS3_OK:
1855 * RENAME3resok resok;
1856 * default:
1857 * RENAME3resfail resfail;
1858 * };
1859 */
nfs3_xdr_dec_rename3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1860 static int nfs3_xdr_dec_rename3res(struct rpc_rqst *req,
1861 struct xdr_stream *xdr,
1862 void *data)
1863 {
1864 struct user_namespace *userns = rpc_rqst_userns(req);
1865 struct nfs_renameres *result = data;
1866 enum nfs_stat status;
1867 int error;
1868
1869 error = decode_nfsstat3(xdr, &status);
1870 if (unlikely(error))
1871 goto out;
1872 error = decode_wcc_data(xdr, result->old_fattr, userns);
1873 if (unlikely(error))
1874 goto out;
1875 error = decode_wcc_data(xdr, result->new_fattr, userns);
1876 if (unlikely(error))
1877 goto out;
1878 if (status != NFS3_OK)
1879 goto out_status;
1880 out:
1881 return error;
1882 out_status:
1883 return nfs3_stat_to_errno(status);
1884 }
1885
1886 /*
1887 * 3.3.15 LINK3res
1888 *
1889 * struct LINK3resok {
1890 * post_op_attr file_attributes;
1891 * wcc_data linkdir_wcc;
1892 * };
1893 *
1894 * struct LINK3resfail {
1895 * post_op_attr file_attributes;
1896 * wcc_data linkdir_wcc;
1897 * };
1898 *
1899 * union LINK3res switch (nfsstat3 status) {
1900 * case NFS3_OK:
1901 * LINK3resok resok;
1902 * default:
1903 * LINK3resfail resfail;
1904 * };
1905 */
nfs3_xdr_dec_link3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)1906 static int nfs3_xdr_dec_link3res(struct rpc_rqst *req, struct xdr_stream *xdr,
1907 void *data)
1908 {
1909 struct user_namespace *userns = rpc_rqst_userns(req);
1910 struct nfs3_linkres *result = data;
1911 enum nfs_stat status;
1912 int error;
1913
1914 error = decode_nfsstat3(xdr, &status);
1915 if (unlikely(error))
1916 goto out;
1917 error = decode_post_op_attr(xdr, result->fattr, userns);
1918 if (unlikely(error))
1919 goto out;
1920 error = decode_wcc_data(xdr, result->dir_attr, userns);
1921 if (unlikely(error))
1922 goto out;
1923 if (status != NFS3_OK)
1924 goto out_status;
1925 out:
1926 return error;
1927 out_status:
1928 return nfs3_stat_to_errno(status);
1929 }
1930
1931 /**
1932 * nfs3_decode_dirent - Decode a single NFSv3 directory entry stored in
1933 * the local page cache
1934 * @xdr: XDR stream where entry resides
1935 * @entry: buffer to fill in with entry data
1936 * @plus: boolean indicating whether this should be a readdirplus entry
1937 *
1938 * Returns zero if successful, otherwise a negative errno value is
1939 * returned.
1940 *
1941 * This function is not invoked during READDIR reply decoding, but
1942 * rather whenever an application invokes the getdents(2) system call
1943 * on a directory already in our cache.
1944 *
1945 * 3.3.16 entry3
1946 *
1947 * struct entry3 {
1948 * fileid3 fileid;
1949 * filename3 name;
1950 * cookie3 cookie;
1951 * fhandle3 filehandle;
1952 * post_op_attr3 attributes;
1953 * entry3 *nextentry;
1954 * };
1955 *
1956 * 3.3.17 entryplus3
1957 * struct entryplus3 {
1958 * fileid3 fileid;
1959 * filename3 name;
1960 * cookie3 cookie;
1961 * post_op_attr name_attributes;
1962 * post_op_fh3 name_handle;
1963 * entryplus3 *nextentry;
1964 * };
1965 */
nfs3_decode_dirent(struct xdr_stream * xdr,struct nfs_entry * entry,bool plus)1966 int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
1967 bool plus)
1968 {
1969 struct user_namespace *userns = rpc_userns(entry->server->client);
1970 struct nfs_entry old = *entry;
1971 __be32 *p;
1972 int error;
1973 u64 new_cookie;
1974
1975 p = xdr_inline_decode(xdr, 4);
1976 if (unlikely(!p))
1977 return -EAGAIN;
1978 if (*p == xdr_zero) {
1979 p = xdr_inline_decode(xdr, 4);
1980 if (unlikely(!p))
1981 return -EAGAIN;
1982 if (*p == xdr_zero)
1983 return -EAGAIN;
1984 entry->eof = 1;
1985 return -EBADCOOKIE;
1986 }
1987
1988 error = decode_fileid3(xdr, &entry->ino);
1989 if (unlikely(error))
1990 return error;
1991
1992 error = decode_inline_filename3(xdr, &entry->name, &entry->len);
1993 if (unlikely(error))
1994 return error;
1995
1996 error = decode_cookie3(xdr, &new_cookie);
1997 if (unlikely(error))
1998 return error;
1999
2000 entry->d_type = DT_UNKNOWN;
2001
2002 if (plus) {
2003 entry->fattr->valid = 0;
2004 error = decode_post_op_attr(xdr, entry->fattr, userns);
2005 if (unlikely(error))
2006 return error;
2007 if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
2008 entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
2009
2010 if (entry->fattr->fileid != entry->ino) {
2011 entry->fattr->mounted_on_fileid = entry->ino;
2012 entry->fattr->valid |= NFS_ATTR_FATTR_MOUNTED_ON_FILEID;
2013 }
2014
2015 /* In fact, a post_op_fh3: */
2016 p = xdr_inline_decode(xdr, 4);
2017 if (unlikely(!p))
2018 return -EAGAIN;
2019 if (*p != xdr_zero) {
2020 error = decode_nfs_fh3(xdr, entry->fh);
2021 if (unlikely(error)) {
2022 if (error == -E2BIG)
2023 goto out_truncated;
2024 return error;
2025 }
2026 } else
2027 zero_nfs_fh3(entry->fh);
2028 }
2029
2030 entry->prev_cookie = entry->cookie;
2031 entry->cookie = new_cookie;
2032
2033 return 0;
2034
2035 out_truncated:
2036 dprintk("NFS: directory entry contains invalid file handle\n");
2037 *entry = old;
2038 return -EAGAIN;
2039 }
2040
2041 /*
2042 * 3.3.16 READDIR3res
2043 *
2044 * struct dirlist3 {
2045 * entry3 *entries;
2046 * bool eof;
2047 * };
2048 *
2049 * struct READDIR3resok {
2050 * post_op_attr dir_attributes;
2051 * cookieverf3 cookieverf;
2052 * dirlist3 reply;
2053 * };
2054 *
2055 * struct READDIR3resfail {
2056 * post_op_attr dir_attributes;
2057 * };
2058 *
2059 * union READDIR3res switch (nfsstat3 status) {
2060 * case NFS3_OK:
2061 * READDIR3resok resok;
2062 * default:
2063 * READDIR3resfail resfail;
2064 * };
2065 *
2066 * Read the directory contents into the page cache, but otherwise
2067 * don't touch them. The actual decoding is done by nfs3_decode_entry()
2068 * during subsequent nfs_readdir() calls.
2069 */
decode_dirlist3(struct xdr_stream * xdr)2070 static int decode_dirlist3(struct xdr_stream *xdr)
2071 {
2072 return xdr_read_pages(xdr, xdr->buf->page_len);
2073 }
2074
decode_readdir3resok(struct xdr_stream * xdr,struct nfs3_readdirres * result,struct user_namespace * userns)2075 static int decode_readdir3resok(struct xdr_stream *xdr,
2076 struct nfs3_readdirres *result,
2077 struct user_namespace *userns)
2078 {
2079 int error;
2080
2081 error = decode_post_op_attr(xdr, result->dir_attr, userns);
2082 if (unlikely(error))
2083 goto out;
2084 /* XXX: do we need to check if result->verf != NULL ? */
2085 error = decode_cookieverf3(xdr, result->verf);
2086 if (unlikely(error))
2087 goto out;
2088 error = decode_dirlist3(xdr);
2089 out:
2090 return error;
2091 }
2092
nfs3_xdr_dec_readdir3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2093 static int nfs3_xdr_dec_readdir3res(struct rpc_rqst *req,
2094 struct xdr_stream *xdr,
2095 void *data)
2096 {
2097 struct nfs3_readdirres *result = data;
2098 enum nfs_stat status;
2099 int error;
2100
2101 error = decode_nfsstat3(xdr, &status);
2102 if (unlikely(error))
2103 goto out;
2104 if (status != NFS3_OK)
2105 goto out_default;
2106 error = decode_readdir3resok(xdr, result, rpc_rqst_userns(req));
2107 out:
2108 return error;
2109 out_default:
2110 error = decode_post_op_attr(xdr, result->dir_attr, rpc_rqst_userns(req));
2111 if (unlikely(error))
2112 goto out;
2113 return nfs3_stat_to_errno(status);
2114 }
2115
2116 /*
2117 * 3.3.18 FSSTAT3res
2118 *
2119 * struct FSSTAT3resok {
2120 * post_op_attr obj_attributes;
2121 * size3 tbytes;
2122 * size3 fbytes;
2123 * size3 abytes;
2124 * size3 tfiles;
2125 * size3 ffiles;
2126 * size3 afiles;
2127 * uint32 invarsec;
2128 * };
2129 *
2130 * struct FSSTAT3resfail {
2131 * post_op_attr obj_attributes;
2132 * };
2133 *
2134 * union FSSTAT3res switch (nfsstat3 status) {
2135 * case NFS3_OK:
2136 * FSSTAT3resok resok;
2137 * default:
2138 * FSSTAT3resfail resfail;
2139 * };
2140 */
decode_fsstat3resok(struct xdr_stream * xdr,struct nfs_fsstat * result)2141 static int decode_fsstat3resok(struct xdr_stream *xdr,
2142 struct nfs_fsstat *result)
2143 {
2144 __be32 *p;
2145
2146 p = xdr_inline_decode(xdr, 8 * 6 + 4);
2147 if (unlikely(!p))
2148 return -EIO;
2149 p = xdr_decode_size3(p, &result->tbytes);
2150 p = xdr_decode_size3(p, &result->fbytes);
2151 p = xdr_decode_size3(p, &result->abytes);
2152 p = xdr_decode_size3(p, &result->tfiles);
2153 p = xdr_decode_size3(p, &result->ffiles);
2154 xdr_decode_size3(p, &result->afiles);
2155 /* ignore invarsec */
2156 return 0;
2157 }
2158
nfs3_xdr_dec_fsstat3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2159 static int nfs3_xdr_dec_fsstat3res(struct rpc_rqst *req,
2160 struct xdr_stream *xdr,
2161 void *data)
2162 {
2163 struct nfs_fsstat *result = data;
2164 enum nfs_stat status;
2165 int error;
2166
2167 error = decode_nfsstat3(xdr, &status);
2168 if (unlikely(error))
2169 goto out;
2170 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2171 if (unlikely(error))
2172 goto out;
2173 if (status != NFS3_OK)
2174 goto out_status;
2175 error = decode_fsstat3resok(xdr, result);
2176 out:
2177 return error;
2178 out_status:
2179 return nfs3_stat_to_errno(status);
2180 }
2181
2182 /*
2183 * 3.3.19 FSINFO3res
2184 *
2185 * struct FSINFO3resok {
2186 * post_op_attr obj_attributes;
2187 * uint32 rtmax;
2188 * uint32 rtpref;
2189 * uint32 rtmult;
2190 * uint32 wtmax;
2191 * uint32 wtpref;
2192 * uint32 wtmult;
2193 * uint32 dtpref;
2194 * size3 maxfilesize;
2195 * nfstime3 time_delta;
2196 * uint32 properties;
2197 * };
2198 *
2199 * struct FSINFO3resfail {
2200 * post_op_attr obj_attributes;
2201 * };
2202 *
2203 * union FSINFO3res switch (nfsstat3 status) {
2204 * case NFS3_OK:
2205 * FSINFO3resok resok;
2206 * default:
2207 * FSINFO3resfail resfail;
2208 * };
2209 */
decode_fsinfo3resok(struct xdr_stream * xdr,struct nfs_fsinfo * result)2210 static int decode_fsinfo3resok(struct xdr_stream *xdr,
2211 struct nfs_fsinfo *result)
2212 {
2213 __be32 *p;
2214
2215 p = xdr_inline_decode(xdr, 4 * 7 + 8 + 8 + 4);
2216 if (unlikely(!p))
2217 return -EIO;
2218 result->rtmax = be32_to_cpup(p++);
2219 result->rtpref = be32_to_cpup(p++);
2220 result->rtmult = be32_to_cpup(p++);
2221 result->wtmax = be32_to_cpup(p++);
2222 result->wtpref = be32_to_cpup(p++);
2223 result->wtmult = be32_to_cpup(p++);
2224 result->dtpref = be32_to_cpup(p++);
2225 p = xdr_decode_size3(p, &result->maxfilesize);
2226 xdr_decode_nfstime3(p, &result->time_delta);
2227
2228 /* ignore properties */
2229 result->lease_time = 0;
2230 return 0;
2231 }
2232
nfs3_xdr_dec_fsinfo3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2233 static int nfs3_xdr_dec_fsinfo3res(struct rpc_rqst *req,
2234 struct xdr_stream *xdr,
2235 void *data)
2236 {
2237 struct nfs_fsinfo *result = data;
2238 enum nfs_stat status;
2239 int error;
2240
2241 error = decode_nfsstat3(xdr, &status);
2242 if (unlikely(error))
2243 goto out;
2244 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2245 if (unlikely(error))
2246 goto out;
2247 if (status != NFS3_OK)
2248 goto out_status;
2249 error = decode_fsinfo3resok(xdr, result);
2250 out:
2251 return error;
2252 out_status:
2253 return nfs3_stat_to_errno(status);
2254 }
2255
2256 /*
2257 * 3.3.20 PATHCONF3res
2258 *
2259 * struct PATHCONF3resok {
2260 * post_op_attr obj_attributes;
2261 * uint32 linkmax;
2262 * uint32 name_max;
2263 * bool no_trunc;
2264 * bool chown_restricted;
2265 * bool case_insensitive;
2266 * bool case_preserving;
2267 * };
2268 *
2269 * struct PATHCONF3resfail {
2270 * post_op_attr obj_attributes;
2271 * };
2272 *
2273 * union PATHCONF3res switch (nfsstat3 status) {
2274 * case NFS3_OK:
2275 * PATHCONF3resok resok;
2276 * default:
2277 * PATHCONF3resfail resfail;
2278 * };
2279 */
decode_pathconf3resok(struct xdr_stream * xdr,struct nfs_pathconf * result)2280 static int decode_pathconf3resok(struct xdr_stream *xdr,
2281 struct nfs_pathconf *result)
2282 {
2283 __be32 *p;
2284
2285 p = xdr_inline_decode(xdr, 4 * 6);
2286 if (unlikely(!p))
2287 return -EIO;
2288 result->max_link = be32_to_cpup(p++);
2289 result->max_namelen = be32_to_cpup(p);
2290 /* ignore remaining fields */
2291 return 0;
2292 }
2293
nfs3_xdr_dec_pathconf3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2294 static int nfs3_xdr_dec_pathconf3res(struct rpc_rqst *req,
2295 struct xdr_stream *xdr,
2296 void *data)
2297 {
2298 struct nfs_pathconf *result = data;
2299 enum nfs_stat status;
2300 int error;
2301
2302 error = decode_nfsstat3(xdr, &status);
2303 if (unlikely(error))
2304 goto out;
2305 error = decode_post_op_attr(xdr, result->fattr, rpc_rqst_userns(req));
2306 if (unlikely(error))
2307 goto out;
2308 if (status != NFS3_OK)
2309 goto out_status;
2310 error = decode_pathconf3resok(xdr, result);
2311 out:
2312 return error;
2313 out_status:
2314 return nfs3_stat_to_errno(status);
2315 }
2316
2317 /*
2318 * 3.3.21 COMMIT3res
2319 *
2320 * struct COMMIT3resok {
2321 * wcc_data file_wcc;
2322 * writeverf3 verf;
2323 * };
2324 *
2325 * struct COMMIT3resfail {
2326 * wcc_data file_wcc;
2327 * };
2328 *
2329 * union COMMIT3res switch (nfsstat3 status) {
2330 * case NFS3_OK:
2331 * COMMIT3resok resok;
2332 * default:
2333 * COMMIT3resfail resfail;
2334 * };
2335 */
nfs3_xdr_dec_commit3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * data)2336 static int nfs3_xdr_dec_commit3res(struct rpc_rqst *req,
2337 struct xdr_stream *xdr,
2338 void *data)
2339 {
2340 struct nfs_commitres *result = data;
2341 enum nfs_stat status;
2342 int error;
2343
2344 error = decode_nfsstat3(xdr, &status);
2345 if (unlikely(error))
2346 goto out;
2347 error = decode_wcc_data(xdr, result->fattr, rpc_rqst_userns(req));
2348 if (unlikely(error))
2349 goto out;
2350 result->op_status = status;
2351 if (status != NFS3_OK)
2352 goto out_status;
2353 error = decode_writeverf3(xdr, &result->verf->verifier);
2354 out:
2355 return error;
2356 out_status:
2357 return nfs3_stat_to_errno(status);
2358 }
2359
2360 #ifdef CONFIG_NFS_V3_ACL
2361
decode_getacl3resok(struct xdr_stream * xdr,struct nfs3_getaclres * result,struct user_namespace * userns)2362 static inline int decode_getacl3resok(struct xdr_stream *xdr,
2363 struct nfs3_getaclres *result,
2364 struct user_namespace *userns)
2365 {
2366 struct posix_acl **acl;
2367 unsigned int *aclcnt;
2368 size_t hdrlen;
2369 int error;
2370
2371 error = decode_post_op_attr(xdr, result->fattr, userns);
2372 if (unlikely(error))
2373 goto out;
2374 error = decode_uint32(xdr, &result->mask);
2375 if (unlikely(error))
2376 goto out;
2377 error = -EINVAL;
2378 if (result->mask & ~(NFS_ACL|NFS_ACLCNT|NFS_DFACL|NFS_DFACLCNT))
2379 goto out;
2380
2381 hdrlen = xdr_stream_pos(xdr);
2382
2383 acl = NULL;
2384 if (result->mask & NFS_ACL)
2385 acl = &result->acl_access;
2386 aclcnt = NULL;
2387 if (result->mask & NFS_ACLCNT)
2388 aclcnt = &result->acl_access_count;
2389 error = nfsacl_decode(xdr->buf, hdrlen, aclcnt, acl);
2390 if (unlikely(error <= 0))
2391 goto out;
2392
2393 acl = NULL;
2394 if (result->mask & NFS_DFACL)
2395 acl = &result->acl_default;
2396 aclcnt = NULL;
2397 if (result->mask & NFS_DFACLCNT)
2398 aclcnt = &result->acl_default_count;
2399 error = nfsacl_decode(xdr->buf, hdrlen + error, aclcnt, acl);
2400 if (unlikely(error <= 0))
2401 return error;
2402 error = 0;
2403 out:
2404 return error;
2405 }
2406
nfs3_xdr_dec_getacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)2407 static int nfs3_xdr_dec_getacl3res(struct rpc_rqst *req,
2408 struct xdr_stream *xdr,
2409 void *result)
2410 {
2411 enum nfs_stat status;
2412 int error;
2413
2414 error = decode_nfsstat3(xdr, &status);
2415 if (unlikely(error))
2416 goto out;
2417 if (status != NFS3_OK)
2418 goto out_default;
2419 error = decode_getacl3resok(xdr, result, rpc_rqst_userns(req));
2420 out:
2421 return error;
2422 out_default:
2423 return nfs3_stat_to_errno(status);
2424 }
2425
nfs3_xdr_dec_setacl3res(struct rpc_rqst * req,struct xdr_stream * xdr,void * result)2426 static int nfs3_xdr_dec_setacl3res(struct rpc_rqst *req,
2427 struct xdr_stream *xdr,
2428 void *result)
2429 {
2430 enum nfs_stat status;
2431 int error;
2432
2433 error = decode_nfsstat3(xdr, &status);
2434 if (unlikely(error))
2435 goto out;
2436 if (status != NFS3_OK)
2437 goto out_default;
2438 error = decode_post_op_attr(xdr, result, rpc_rqst_userns(req));
2439 out:
2440 return error;
2441 out_default:
2442 return nfs3_stat_to_errno(status);
2443 }
2444
2445 #endif /* CONFIG_NFS_V3_ACL */
2446
2447
2448 /*
2449 * We need to translate between nfs status return values and
2450 * the local errno values which may not be the same.
2451 */
2452 static const struct {
2453 int stat;
2454 int errno;
2455 } nfs_errtbl[] = {
2456 { NFS_OK, 0 },
2457 { NFSERR_PERM, -EPERM },
2458 { NFSERR_NOENT, -ENOENT },
2459 { NFSERR_IO, -errno_NFSERR_IO},
2460 { NFSERR_NXIO, -ENXIO },
2461 /* { NFSERR_EAGAIN, -EAGAIN }, */
2462 { NFSERR_ACCES, -EACCES },
2463 { NFSERR_EXIST, -EEXIST },
2464 { NFSERR_XDEV, -EXDEV },
2465 { NFSERR_NODEV, -ENODEV },
2466 { NFSERR_NOTDIR, -ENOTDIR },
2467 { NFSERR_ISDIR, -EISDIR },
2468 { NFSERR_INVAL, -EINVAL },
2469 { NFSERR_FBIG, -EFBIG },
2470 { NFSERR_NOSPC, -ENOSPC },
2471 { NFSERR_ROFS, -EROFS },
2472 { NFSERR_MLINK, -EMLINK },
2473 { NFSERR_NAMETOOLONG, -ENAMETOOLONG },
2474 { NFSERR_NOTEMPTY, -ENOTEMPTY },
2475 { NFSERR_DQUOT, -EDQUOT },
2476 { NFSERR_STALE, -ESTALE },
2477 { NFSERR_REMOTE, -EREMOTE },
2478 #ifdef EWFLUSH
2479 { NFSERR_WFLUSH, -EWFLUSH },
2480 #endif
2481 { NFSERR_BADHANDLE, -EBADHANDLE },
2482 { NFSERR_NOT_SYNC, -ENOTSYNC },
2483 { NFSERR_BAD_COOKIE, -EBADCOOKIE },
2484 { NFSERR_NOTSUPP, -ENOTSUPP },
2485 { NFSERR_TOOSMALL, -ETOOSMALL },
2486 { NFSERR_SERVERFAULT, -EREMOTEIO },
2487 { NFSERR_BADTYPE, -EBADTYPE },
2488 { NFSERR_JUKEBOX, -EJUKEBOX },
2489 { -1, -EIO }
2490 };
2491
2492 /**
2493 * nfs3_stat_to_errno - convert an NFS status code to a local errno
2494 * @status: NFS status code to convert
2495 *
2496 * Returns a local errno value, or -EIO if the NFS status code is
2497 * not recognized. This function is used jointly by NFSv2 and NFSv3.
2498 */
nfs3_stat_to_errno(enum nfs_stat status)2499 static int nfs3_stat_to_errno(enum nfs_stat status)
2500 {
2501 int i;
2502
2503 for (i = 0; nfs_errtbl[i].stat != -1; i++) {
2504 if (nfs_errtbl[i].stat == (int)status)
2505 return nfs_errtbl[i].errno;
2506 }
2507 dprintk("NFS: Unrecognized nfs status value: %u\n", status);
2508 return nfs_errtbl[i].errno;
2509 }
2510
2511
2512 #define PROC(proc, argtype, restype, timer) \
2513 [NFS3PROC_##proc] = { \
2514 .p_proc = NFS3PROC_##proc, \
2515 .p_encode = nfs3_xdr_enc_##argtype##3args, \
2516 .p_decode = nfs3_xdr_dec_##restype##3res, \
2517 .p_arglen = NFS3_##argtype##args_sz, \
2518 .p_replen = NFS3_##restype##res_sz, \
2519 .p_timer = timer, \
2520 .p_statidx = NFS3PROC_##proc, \
2521 .p_name = #proc, \
2522 }
2523
2524 const struct rpc_procinfo nfs3_procedures[] = {
2525 PROC(GETATTR, getattr, getattr, 1),
2526 PROC(SETATTR, setattr, setattr, 0),
2527 PROC(LOOKUP, lookup, lookup, 2),
2528 PROC(ACCESS, access, access, 1),
2529 PROC(READLINK, readlink, readlink, 3),
2530 PROC(READ, read, read, 3),
2531 PROC(WRITE, write, write, 4),
2532 PROC(CREATE, create, create, 0),
2533 PROC(MKDIR, mkdir, create, 0),
2534 PROC(SYMLINK, symlink, create, 0),
2535 PROC(MKNOD, mknod, create, 0),
2536 PROC(REMOVE, remove, remove, 0),
2537 PROC(RMDIR, lookup, setattr, 0),
2538 PROC(RENAME, rename, rename, 0),
2539 PROC(LINK, link, link, 0),
2540 PROC(READDIR, readdir, readdir, 3),
2541 PROC(READDIRPLUS, readdirplus, readdir, 3),
2542 PROC(FSSTAT, getattr, fsstat, 0),
2543 PROC(FSINFO, getattr, fsinfo, 0),
2544 PROC(PATHCONF, getattr, pathconf, 0),
2545 PROC(COMMIT, commit, commit, 5),
2546 };
2547
2548 static unsigned int nfs_version3_counts[ARRAY_SIZE(nfs3_procedures)];
2549 const struct rpc_version nfs_version3 = {
2550 .number = 3,
2551 .nrprocs = ARRAY_SIZE(nfs3_procedures),
2552 .procs = nfs3_procedures,
2553 .counts = nfs_version3_counts,
2554 };
2555
2556 #ifdef CONFIG_NFS_V3_ACL
2557 static const struct rpc_procinfo nfs3_acl_procedures[] = {
2558 [ACLPROC3_GETACL] = {
2559 .p_proc = ACLPROC3_GETACL,
2560 .p_encode = nfs3_xdr_enc_getacl3args,
2561 .p_decode = nfs3_xdr_dec_getacl3res,
2562 .p_arglen = ACL3_getaclargs_sz,
2563 .p_replen = ACL3_getaclres_sz,
2564 .p_timer = 1,
2565 .p_name = "GETACL",
2566 },
2567 [ACLPROC3_SETACL] = {
2568 .p_proc = ACLPROC3_SETACL,
2569 .p_encode = nfs3_xdr_enc_setacl3args,
2570 .p_decode = nfs3_xdr_dec_setacl3res,
2571 .p_arglen = ACL3_setaclargs_sz,
2572 .p_replen = ACL3_setaclres_sz,
2573 .p_timer = 0,
2574 .p_name = "SETACL",
2575 },
2576 };
2577
2578 static unsigned int nfs3_acl_counts[ARRAY_SIZE(nfs3_acl_procedures)];
2579 const struct rpc_version nfsacl_version3 = {
2580 .number = 3,
2581 .nrprocs = ARRAY_SIZE(nfs3_acl_procedures),
2582 .procs = nfs3_acl_procedures,
2583 .counts = nfs3_acl_counts,
2584 };
2585 #endif /* CONFIG_NFS_V3_ACL */
2586