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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * XDR support for nfsd
4 *
5 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
6 */
7
8#include "vfs.h"
9#include "xdr.h"
10#include "auth.h"
11
12/*
13 * Mapping of S_IF* types to NFS file types
14 */
15static const u32 nfs_ftypes[] = {
16 NFNON, NFCHR, NFCHR, NFBAD,
17 NFDIR, NFBAD, NFBLK, NFBAD,
18 NFREG, NFBAD, NFLNK, NFBAD,
19 NFSOCK, NFBAD, NFLNK, NFBAD,
20};
21
22
23/*
24 * Basic NFSv2 data types (RFC 1094 Section 2.3)
25 */
26
27/**
28 * svcxdr_encode_stat - Encode an NFSv2 status code
29 * @xdr: XDR stream
30 * @status: status value to encode
31 *
32 * Return values:
33 * %false: Send buffer space was exhausted
34 * %true: Success
35 */
36bool
37svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status)
38{
39 __be32 *p;
40
41 p = xdr_reserve_space(xdr, sizeof(status));
42 if (!p)
43 return false;
44 *p = status;
45
46 return true;
47}
48
49/**
50 * svcxdr_decode_fhandle - Decode an NFSv2 file handle
51 * @xdr: XDR stream positioned at an encoded NFSv2 FH
52 * @fhp: OUT: filled-in server file handle
53 *
54 * Return values:
55 * %false: The encoded file handle was not valid
56 * %true: @fhp has been initialized
57 */
58bool
59svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp)
60{
61 __be32 *p;
62
63 p = xdr_inline_decode(xdr, NFS_FHSIZE);
64 if (!p)
65 return false;
66 fh_init(fhp, NFS_FHSIZE);
67 memcpy(&fhp->fh_handle.fh_raw, p, NFS_FHSIZE);
68 fhp->fh_handle.fh_size = NFS_FHSIZE;
69
70 return true;
71}
72
73static bool
74svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp)
75{
76 __be32 *p;
77
78 p = xdr_reserve_space(xdr, NFS_FHSIZE);
79 if (!p)
80 return false;
81 memcpy(p, &fhp->fh_handle.fh_raw, NFS_FHSIZE);
82
83 return true;
84}
85
86static __be32 *
87encode_timeval(__be32 *p, const struct timespec64 *time)
88{
89 *p++ = cpu_to_be32((u32)time->tv_sec);
90 if (time->tv_nsec)
91 *p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC);
92 else
93 *p++ = xdr_zero;
94 return p;
95}
96
97static bool
98svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len)
99{
100 u32 size, i;
101 __be32 *p;
102 char *c;
103
104 if (xdr_stream_decode_u32(xdr, &size) < 0)
105 return false;
106 if (size == 0 || size > NFS_MAXNAMLEN)
107 return false;
108 p = xdr_inline_decode(xdr, size);
109 if (!p)
110 return false;
111
112 *len = size;
113 *name = (char *)p;
114 for (i = 0, c = *name; i < size; i++, c++)
115 if (*c == '\0' || *c == '/')
116 return false;
117
118 return true;
119}
120
121static bool
122svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp,
123 char **name, unsigned int *len)
124{
125 return svcxdr_decode_fhandle(xdr, fhp) &&
126 svcxdr_decode_filename(xdr, name, len);
127}
128
129static bool
130svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
131 struct iattr *iap)
132{
133 u32 tmp1, tmp2;
134 __be32 *p;
135
136 p = xdr_inline_decode(xdr, XDR_UNIT * 8);
137 if (!p)
138 return false;
139
140 iap->ia_valid = 0;
141
142 /*
143 * Some Sun clients put 0xffff in the mode field when they
144 * mean 0xffffffff.
145 */
146 tmp1 = be32_to_cpup(p++);
147 if (tmp1 != (u32)-1 && tmp1 != 0xffff) {
148 iap->ia_valid |= ATTR_MODE;
149 iap->ia_mode = tmp1;
150 }
151
152 tmp1 = be32_to_cpup(p++);
153 if (tmp1 != (u32)-1) {
154 iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1);
155 if (uid_valid(iap->ia_uid))
156 iap->ia_valid |= ATTR_UID;
157 }
158
159 tmp1 = be32_to_cpup(p++);
160 if (tmp1 != (u32)-1) {
161 iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1);
162 if (gid_valid(iap->ia_gid))
163 iap->ia_valid |= ATTR_GID;
164 }
165
166 tmp1 = be32_to_cpup(p++);
167 if (tmp1 != (u32)-1) {
168 iap->ia_valid |= ATTR_SIZE;
169 iap->ia_size = tmp1;
170 }
171
172 tmp1 = be32_to_cpup(p++);
173 tmp2 = be32_to_cpup(p++);
174 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
175 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
176 iap->ia_atime.tv_sec = tmp1;
177 iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC;
178 }
179
180 tmp1 = be32_to_cpup(p++);
181 tmp2 = be32_to_cpup(p++);
182 if (tmp1 != (u32)-1 && tmp2 != (u32)-1) {
183 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
184 iap->ia_mtime.tv_sec = tmp1;
185 iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC;
186 /*
187 * Passing the invalid value useconds=1000000 for mtime
188 * is a Sun convention for "set both mtime and atime to
189 * current server time". It's needed to make permissions
190 * checks for the "touch" program across v2 mounts to
191 * Solaris and Irix boxes work correctly. See description of
192 * sattr in section 6.1 of "NFS Illustrated" by
193 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
194 */
195 if (tmp2 == 1000000)
196 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
197 }
198
199 return true;
200}
201
202/**
203 * svcxdr_encode_fattr - Encode NFSv2 file attributes
204 * @rqstp: Context of a completed RPC transaction
205 * @xdr: XDR stream
206 * @fhp: File handle to encode
207 * @stat: Attributes to encode
208 *
209 * Return values:
210 * %false: Send buffer space was exhausted
211 * %true: Success
212 */
213bool
214svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr,
215 const struct svc_fh *fhp, const struct kstat *stat)
216{
217 struct user_namespace *userns = nfsd_user_namespace(rqstp);
218 struct dentry *dentry = fhp->fh_dentry;
219 int type = stat->mode & S_IFMT;
220 struct timespec64 time;
221 __be32 *p;
222 u32 fsid;
223
224 p = xdr_reserve_space(xdr, XDR_UNIT * 17);
225 if (!p)
226 return false;
227
228 *p++ = cpu_to_be32(nfs_ftypes[type >> 12]);
229 *p++ = cpu_to_be32((u32)stat->mode);
230 *p++ = cpu_to_be32((u32)stat->nlink);
231 *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid));
232 *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid));
233
234 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN)
235 *p++ = cpu_to_be32(NFS_MAXPATHLEN);
236 else
237 *p++ = cpu_to_be32((u32) stat->size);
238 *p++ = cpu_to_be32((u32) stat->blksize);
239 if (S_ISCHR(type) || S_ISBLK(type))
240 *p++ = cpu_to_be32(new_encode_dev(stat->rdev));
241 else
242 *p++ = cpu_to_be32(0xffffffff);
243 *p++ = cpu_to_be32((u32)stat->blocks);
244
245 switch (fsid_source(fhp)) {
246 case FSIDSOURCE_FSID:
247 fsid = (u32)fhp->fh_export->ex_fsid;
248 break;
249 case FSIDSOURCE_UUID:
250 fsid = ((u32 *)fhp->fh_export->ex_uuid)[0];
251 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1];
252 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2];
253 fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3];
254 break;
255 default:
256 fsid = new_encode_dev(stat->dev);
257 break;
258 }
259 *p++ = cpu_to_be32(fsid);
260
261 *p++ = cpu_to_be32((u32)stat->ino);
262 p = encode_timeval(p, &stat->atime);
263 time = stat->mtime;
264 lease_get_mtime(d_inode(dentry), &time);
265 p = encode_timeval(p, &time);
266 encode_timeval(p, &stat->ctime);
267
268 return true;
269}
270
271/*
272 * XDR decode functions
273 */
274
275bool
276nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
277{
278 struct nfsd_fhandle *args = rqstp->rq_argp;
279
280 return svcxdr_decode_fhandle(xdr, &args->fh);
281}
282
283bool
284nfssvc_decode_sattrargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
285{
286 struct nfsd_sattrargs *args = rqstp->rq_argp;
287
288 return svcxdr_decode_fhandle(xdr, &args->fh) &&
289 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
290}
291
292bool
293nfssvc_decode_diropargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
294{
295 struct nfsd_diropargs *args = rqstp->rq_argp;
296
297 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
298}
299
300bool
301nfssvc_decode_readargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
302{
303 struct nfsd_readargs *args = rqstp->rq_argp;
304 u32 totalcount;
305
306 if (!svcxdr_decode_fhandle(xdr, &args->fh))
307 return false;
308 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
309 return false;
310 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
311 return false;
312 /* totalcount is ignored */
313 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
314 return false;
315
316 return true;
317}
318
319bool
320nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
321{
322 struct nfsd_writeargs *args = rqstp->rq_argp;
323 u32 beginoffset, totalcount;
324
325 if (!svcxdr_decode_fhandle(xdr, &args->fh))
326 return false;
327 /* beginoffset is ignored */
328 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
329 return false;
330 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
331 return false;
332 /* totalcount is ignored */
333 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
334 return false;
335
336 /* opaque data */
337 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
338 return false;
339 if (args->len > NFSSVC_MAXBLKSIZE_V2)
340 return false;
341
342 return xdr_stream_subsegment(xdr, &args->payload, args->len);
343}
344
345bool
346nfssvc_decode_createargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
347{
348 struct nfsd_createargs *args = rqstp->rq_argp;
349
350 return svcxdr_decode_diropargs(xdr, &args->fh,
351 &args->name, &args->len) &&
352 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
353}
354
355bool
356nfssvc_decode_renameargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
357{
358 struct nfsd_renameargs *args = rqstp->rq_argp;
359
360 return svcxdr_decode_diropargs(xdr, &args->ffh,
361 &args->fname, &args->flen) &&
362 svcxdr_decode_diropargs(xdr, &args->tfh,
363 &args->tname, &args->tlen);
364}
365
366bool
367nfssvc_decode_linkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
368{
369 struct nfsd_linkargs *args = rqstp->rq_argp;
370
371 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
372 svcxdr_decode_diropargs(xdr, &args->tfh,
373 &args->tname, &args->tlen);
374}
375
376bool
377nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
378{
379 struct nfsd_symlinkargs *args = rqstp->rq_argp;
380 struct kvec *head = rqstp->rq_arg.head;
381
382 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
383 return false;
384 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
385 return false;
386 if (args->tlen == 0)
387 return false;
388
389 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
390 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
391 if (!args->first.iov_base)
392 return false;
393 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
394}
395
396bool
397nfssvc_decode_readdirargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
398{
399 struct nfsd_readdirargs *args = rqstp->rq_argp;
400
401 if (!svcxdr_decode_fhandle(xdr, &args->fh))
402 return false;
403 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
404 return false;
405 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
406 return false;
407
408 return true;
409}
410
411/*
412 * XDR encode functions
413 */
414
415bool
416nfssvc_encode_statres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
417{
418 struct nfsd_stat *resp = rqstp->rq_resp;
419
420 return svcxdr_encode_stat(xdr, resp->status);
421}
422
423bool
424nfssvc_encode_attrstatres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
425{
426 struct nfsd_attrstat *resp = rqstp->rq_resp;
427
428 if (!svcxdr_encode_stat(xdr, resp->status))
429 return false;
430 switch (resp->status) {
431 case nfs_ok:
432 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
433 return false;
434 break;
435 }
436
437 return true;
438}
439
440bool
441nfssvc_encode_diropres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
442{
443 struct nfsd_diropres *resp = rqstp->rq_resp;
444
445 if (!svcxdr_encode_stat(xdr, resp->status))
446 return false;
447 switch (resp->status) {
448 case nfs_ok:
449 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
450 return false;
451 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
452 return false;
453 break;
454 }
455
456 return true;
457}
458
459bool
460nfssvc_encode_readlinkres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
461{
462 struct nfsd_readlinkres *resp = rqstp->rq_resp;
463 struct kvec *head = rqstp->rq_res.head;
464
465 if (!svcxdr_encode_stat(xdr, resp->status))
466 return false;
467 switch (resp->status) {
468 case nfs_ok:
469 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
470 return false;
471 xdr_write_pages(xdr, &resp->page, 0, resp->len);
472 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
473 return false;
474 break;
475 }
476
477 return true;
478}
479
480bool
481nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
482{
483 struct nfsd_readres *resp = rqstp->rq_resp;
484 struct kvec *head = rqstp->rq_res.head;
485
486 if (!svcxdr_encode_stat(xdr, resp->status))
487 return false;
488 switch (resp->status) {
489 case nfs_ok:
490 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
491 return false;
492 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
493 return false;
494 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
495 resp->count);
496 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
497 return false;
498 break;
499 }
500
501 return true;
502}
503
504bool
505nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
506{
507 struct nfsd_readdirres *resp = rqstp->rq_resp;
508 struct xdr_buf *dirlist = &resp->dirlist;
509
510 if (!svcxdr_encode_stat(xdr, resp->status))
511 return false;
512 switch (resp->status) {
513 case nfs_ok:
514 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
515 /* no more entries */
516 if (xdr_stream_encode_item_absent(xdr) < 0)
517 return false;
518 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
519 return false;
520 break;
521 }
522
523 return true;
524}
525
526bool
527nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
528{
529 struct nfsd_statfsres *resp = rqstp->rq_resp;
530 struct kstatfs *stat = &resp->stats;
531 __be32 *p;
532
533 if (!svcxdr_encode_stat(xdr, resp->status))
534 return false;
535 switch (resp->status) {
536 case nfs_ok:
537 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
538 if (!p)
539 return false;
540 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
541 *p++ = cpu_to_be32(stat->f_bsize);
542 *p++ = cpu_to_be32(stat->f_blocks);
543 *p++ = cpu_to_be32(stat->f_bfree);
544 *p = cpu_to_be32(stat->f_bavail);
545 break;
546 }
547
548 return true;
549}
550
551/**
552 * nfssvc_encode_nfscookie - Encode a directory offset cookie
553 * @resp: readdir result context
554 * @offset: offset cookie to encode
555 *
556 * The buffer space for the offset cookie has already been reserved
557 * by svcxdr_encode_entry_common().
558 */
559void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
560{
561 __be32 cookie = cpu_to_be32(offset);
562
563 if (!resp->cookie_offset)
564 return;
565
566 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
567 sizeof(cookie));
568 resp->cookie_offset = 0;
569}
570
571static bool
572svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
573 int namlen, loff_t offset, u64 ino)
574{
575 struct xdr_buf *dirlist = &resp->dirlist;
576 struct xdr_stream *xdr = &resp->xdr;
577
578 if (xdr_stream_encode_item_present(xdr) < 0)
579 return false;
580 /* fileid */
581 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
582 return false;
583 /* name */
584 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
585 return false;
586 /* cookie */
587 resp->cookie_offset = dirlist->len;
588 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
589 return false;
590
591 return true;
592}
593
594/**
595 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
596 * @data: directory context
597 * @name: name of the object to be encoded
598 * @namlen: length of that name, in bytes
599 * @offset: the offset of the previous entry
600 * @ino: the fileid of this entry
601 * @d_type: unused
602 *
603 * Return values:
604 * %0: Entry was successfully encoded.
605 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
606 *
607 * On exit, the following fields are updated:
608 * - resp->xdr
609 * - resp->common.err
610 * - resp->cookie_offset
611 */
612int nfssvc_encode_entry(void *data, const char *name, int namlen,
613 loff_t offset, u64 ino, unsigned int d_type)
614{
615 struct readdir_cd *ccd = data;
616 struct nfsd_readdirres *resp = container_of(ccd,
617 struct nfsd_readdirres,
618 common);
619 unsigned int starting_length = resp->dirlist.len;
620
621 /* The offset cookie for the previous entry */
622 nfssvc_encode_nfscookie(resp, offset);
623
624 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
625 goto out_toosmall;
626
627 xdr_commit_encode(&resp->xdr);
628 resp->common.err = nfs_ok;
629 return 0;
630
631out_toosmall:
632 resp->cookie_offset = 0;
633 resp->common.err = nfserr_toosmall;
634 resp->dirlist.len = starting_length;
635 return -EINVAL;
636}
637
638/*
639 * XDR release functions
640 */
641void nfssvc_release_attrstat(struct svc_rqst *rqstp)
642{
643 struct nfsd_attrstat *resp = rqstp->rq_resp;
644
645 fh_put(&resp->fh);
646}
647
648void nfssvc_release_diropres(struct svc_rqst *rqstp)
649{
650 struct nfsd_diropres *resp = rqstp->rq_resp;
651
652 fh_put(&resp->fh);
653}
654
655void nfssvc_release_readres(struct svc_rqst *rqstp)
656{
657 struct nfsd_readres *resp = rqstp->rq_resp;
658
659 fh_put(&resp->fh);
660}
1/*
2 * XDR support for nfsd
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include "vfs.h"
8#include "xdr.h"
9#include "auth.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_XDR
12
13/*
14 * Mapping of S_IF* types to NFS file types
15 */
16static u32 nfs_ftypes[] = {
17 NFNON, NFCHR, NFCHR, NFBAD,
18 NFDIR, NFBAD, NFBLK, NFBAD,
19 NFREG, NFBAD, NFLNK, NFBAD,
20 NFSOCK, NFBAD, NFLNK, NFBAD,
21};
22
23
24/*
25 * XDR functions for basic NFS types
26 */
27static __be32 *
28decode_fh(__be32 *p, struct svc_fh *fhp)
29{
30 fh_init(fhp, NFS_FHSIZE);
31 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
32 fhp->fh_handle.fh_size = NFS_FHSIZE;
33
34 /* FIXME: Look up export pointer here and verify
35 * Sun Secure RPC if requested */
36 return p + (NFS_FHSIZE >> 2);
37}
38
39/* Helper function for NFSv2 ACL code */
40__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
41{
42 return decode_fh(p, fhp);
43}
44
45static __be32 *
46encode_fh(__be32 *p, struct svc_fh *fhp)
47{
48 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
49 return p + (NFS_FHSIZE>> 2);
50}
51
52/*
53 * Decode a file name and make sure that the path contains
54 * no slashes or null bytes.
55 */
56static __be32 *
57decode_filename(__be32 *p, char **namp, unsigned int *lenp)
58{
59 char *name;
60 unsigned int i;
61
62 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
63 for (i = 0, name = *namp; i < *lenp; i++, name++) {
64 if (*name == '\0' || *name == '/')
65 return NULL;
66 }
67 }
68
69 return p;
70}
71
72static __be32 *
73decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
74{
75 char *name;
76 unsigned int i;
77
78 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
79 for (i = 0, name = *namp; i < *lenp; i++, name++) {
80 if (*name == '\0')
81 return NULL;
82 }
83 }
84
85 return p;
86}
87
88static __be32 *
89decode_sattr(__be32 *p, struct iattr *iap)
90{
91 u32 tmp, tmp1;
92
93 iap->ia_valid = 0;
94
95 /* Sun client bug compatibility check: some sun clients seem to
96 * put 0xffff in the mode field when they mean 0xffffffff.
97 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
98 */
99 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
100 iap->ia_valid |= ATTR_MODE;
101 iap->ia_mode = tmp;
102 }
103 if ((tmp = ntohl(*p++)) != (u32)-1) {
104 iap->ia_uid = make_kuid(&init_user_ns, tmp);
105 if (uid_valid(iap->ia_uid))
106 iap->ia_valid |= ATTR_UID;
107 }
108 if ((tmp = ntohl(*p++)) != (u32)-1) {
109 iap->ia_gid = make_kgid(&init_user_ns, tmp);
110 if (gid_valid(iap->ia_gid))
111 iap->ia_valid |= ATTR_GID;
112 }
113 if ((tmp = ntohl(*p++)) != (u32)-1) {
114 iap->ia_valid |= ATTR_SIZE;
115 iap->ia_size = tmp;
116 }
117 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
118 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
119 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
120 iap->ia_atime.tv_sec = tmp;
121 iap->ia_atime.tv_nsec = tmp1 * 1000;
122 }
123 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
124 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
125 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
126 iap->ia_mtime.tv_sec = tmp;
127 iap->ia_mtime.tv_nsec = tmp1 * 1000;
128 /*
129 * Passing the invalid value useconds=1000000 for mtime
130 * is a Sun convention for "set both mtime and atime to
131 * current server time". It's needed to make permissions
132 * checks for the "touch" program across v2 mounts to
133 * Solaris and Irix boxes work correctly. See description of
134 * sattr in section 6.1 of "NFS Illustrated" by
135 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
136 */
137 if (tmp1 == 1000000)
138 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
139 }
140 return p;
141}
142
143static __be32 *
144encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
145 struct kstat *stat)
146{
147 struct dentry *dentry = fhp->fh_dentry;
148 int type;
149 struct timespec time;
150 u32 f;
151
152 type = (stat->mode & S_IFMT);
153
154 *p++ = htonl(nfs_ftypes[type >> 12]);
155 *p++ = htonl((u32) stat->mode);
156 *p++ = htonl((u32) stat->nlink);
157 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
158 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
159
160 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
161 *p++ = htonl(NFS_MAXPATHLEN);
162 } else {
163 *p++ = htonl((u32) stat->size);
164 }
165 *p++ = htonl((u32) stat->blksize);
166 if (S_ISCHR(type) || S_ISBLK(type))
167 *p++ = htonl(new_encode_dev(stat->rdev));
168 else
169 *p++ = htonl(0xffffffff);
170 *p++ = htonl((u32) stat->blocks);
171 switch (fsid_source(fhp)) {
172 default:
173 case FSIDSOURCE_DEV:
174 *p++ = htonl(new_encode_dev(stat->dev));
175 break;
176 case FSIDSOURCE_FSID:
177 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
178 break;
179 case FSIDSOURCE_UUID:
180 f = ((u32*)fhp->fh_export->ex_uuid)[0];
181 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
182 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
183 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
184 *p++ = htonl(f);
185 break;
186 }
187 *p++ = htonl((u32) stat->ino);
188 *p++ = htonl((u32) stat->atime.tv_sec);
189 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
190 lease_get_mtime(d_inode(dentry), &time);
191 *p++ = htonl((u32) time.tv_sec);
192 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
193 *p++ = htonl((u32) stat->ctime.tv_sec);
194 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
195
196 return p;
197}
198
199/* Helper function for NFSv2 ACL code */
200__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
201{
202 return encode_fattr(rqstp, p, fhp, stat);
203}
204
205/*
206 * XDR decode functions
207 */
208int
209nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
210{
211 return xdr_argsize_check(rqstp, p);
212}
213
214int
215nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
216{
217 p = decode_fh(p, &args->fh);
218 if (!p)
219 return 0;
220 return xdr_argsize_check(rqstp, p);
221}
222
223int
224nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
225 struct nfsd_sattrargs *args)
226{
227 p = decode_fh(p, &args->fh);
228 if (!p)
229 return 0;
230 p = decode_sattr(p, &args->attrs);
231
232 return xdr_argsize_check(rqstp, p);
233}
234
235int
236nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
237 struct nfsd_diropargs *args)
238{
239 if (!(p = decode_fh(p, &args->fh))
240 || !(p = decode_filename(p, &args->name, &args->len)))
241 return 0;
242
243 return xdr_argsize_check(rqstp, p);
244}
245
246int
247nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
248 struct nfsd_readargs *args)
249{
250 unsigned int len;
251 int v;
252 p = decode_fh(p, &args->fh);
253 if (!p)
254 return 0;
255
256 args->offset = ntohl(*p++);
257 len = args->count = ntohl(*p++);
258 p++; /* totalcount - unused */
259
260 len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
261
262 /* set up somewhere to store response.
263 * We take pages, put them on reslist and include in iovec
264 */
265 v=0;
266 while (len > 0) {
267 struct page *p = *(rqstp->rq_next_page++);
268
269 rqstp->rq_vec[v].iov_base = page_address(p);
270 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
271 len -= rqstp->rq_vec[v].iov_len;
272 v++;
273 }
274 args->vlen = v;
275 return xdr_argsize_check(rqstp, p);
276}
277
278int
279nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
280 struct nfsd_writeargs *args)
281{
282 unsigned int len, hdr, dlen;
283 int v;
284
285 p = decode_fh(p, &args->fh);
286 if (!p)
287 return 0;
288
289 p++; /* beginoffset */
290 args->offset = ntohl(*p++); /* offset */
291 p++; /* totalcount */
292 len = args->len = ntohl(*p++);
293 /*
294 * The protocol specifies a maximum of 8192 bytes.
295 */
296 if (len > NFSSVC_MAXBLKSIZE_V2)
297 return 0;
298
299 /*
300 * Check to make sure that we got the right number of
301 * bytes.
302 */
303 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
304 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
305 - hdr;
306
307 /*
308 * Round the length of the data which was specified up to
309 * the next multiple of XDR units and then compare that
310 * against the length which was actually received.
311 * Note that when RPCSEC/GSS (for example) is used, the
312 * data buffer can be padded so dlen might be larger
313 * than required. It must never be smaller.
314 */
315 if (dlen < XDR_QUADLEN(len)*4)
316 return 0;
317
318 rqstp->rq_vec[0].iov_base = (void*)p;
319 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
320 v = 0;
321 while (len > rqstp->rq_vec[v].iov_len) {
322 len -= rqstp->rq_vec[v].iov_len;
323 v++;
324 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
325 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
326 }
327 rqstp->rq_vec[v].iov_len = len;
328 args->vlen = v + 1;
329 return 1;
330}
331
332int
333nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
334 struct nfsd_createargs *args)
335{
336 if ( !(p = decode_fh(p, &args->fh))
337 || !(p = decode_filename(p, &args->name, &args->len)))
338 return 0;
339 p = decode_sattr(p, &args->attrs);
340
341 return xdr_argsize_check(rqstp, p);
342}
343
344int
345nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
346 struct nfsd_renameargs *args)
347{
348 if (!(p = decode_fh(p, &args->ffh))
349 || !(p = decode_filename(p, &args->fname, &args->flen))
350 || !(p = decode_fh(p, &args->tfh))
351 || !(p = decode_filename(p, &args->tname, &args->tlen)))
352 return 0;
353
354 return xdr_argsize_check(rqstp, p);
355}
356
357int
358nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
359{
360 p = decode_fh(p, &args->fh);
361 if (!p)
362 return 0;
363 args->buffer = page_address(*(rqstp->rq_next_page++));
364
365 return xdr_argsize_check(rqstp, p);
366}
367
368int
369nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
370 struct nfsd_linkargs *args)
371{
372 if (!(p = decode_fh(p, &args->ffh))
373 || !(p = decode_fh(p, &args->tfh))
374 || !(p = decode_filename(p, &args->tname, &args->tlen)))
375 return 0;
376
377 return xdr_argsize_check(rqstp, p);
378}
379
380int
381nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
382 struct nfsd_symlinkargs *args)
383{
384 if ( !(p = decode_fh(p, &args->ffh))
385 || !(p = decode_filename(p, &args->fname, &args->flen))
386 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
387 return 0;
388 p = decode_sattr(p, &args->attrs);
389
390 return xdr_argsize_check(rqstp, p);
391}
392
393int
394nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
395 struct nfsd_readdirargs *args)
396{
397 p = decode_fh(p, &args->fh);
398 if (!p)
399 return 0;
400 args->cookie = ntohl(*p++);
401 args->count = ntohl(*p++);
402 args->count = min_t(u32, args->count, PAGE_SIZE);
403 args->buffer = page_address(*(rqstp->rq_next_page++));
404
405 return xdr_argsize_check(rqstp, p);
406}
407
408/*
409 * XDR encode functions
410 */
411int
412nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
413{
414 return xdr_ressize_check(rqstp, p);
415}
416
417int
418nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
419 struct nfsd_attrstat *resp)
420{
421 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
422 return xdr_ressize_check(rqstp, p);
423}
424
425int
426nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
427 struct nfsd_diropres *resp)
428{
429 p = encode_fh(p, &resp->fh);
430 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
431 return xdr_ressize_check(rqstp, p);
432}
433
434int
435nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
436 struct nfsd_readlinkres *resp)
437{
438 *p++ = htonl(resp->len);
439 xdr_ressize_check(rqstp, p);
440 rqstp->rq_res.page_len = resp->len;
441 if (resp->len & 3) {
442 /* need to pad the tail */
443 rqstp->rq_res.tail[0].iov_base = p;
444 *p = 0;
445 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
446 }
447 return 1;
448}
449
450int
451nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
452 struct nfsd_readres *resp)
453{
454 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
455 *p++ = htonl(resp->count);
456 xdr_ressize_check(rqstp, p);
457
458 /* now update rqstp->rq_res to reflect data as well */
459 rqstp->rq_res.page_len = resp->count;
460 if (resp->count & 3) {
461 /* need to pad the tail */
462 rqstp->rq_res.tail[0].iov_base = p;
463 *p = 0;
464 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
465 }
466 return 1;
467}
468
469int
470nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
471 struct nfsd_readdirres *resp)
472{
473 xdr_ressize_check(rqstp, p);
474 p = resp->buffer;
475 *p++ = 0; /* no more entries */
476 *p++ = htonl((resp->common.err == nfserr_eof));
477 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
478
479 return 1;
480}
481
482int
483nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
484 struct nfsd_statfsres *resp)
485{
486 struct kstatfs *stat = &resp->stats;
487
488 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
489 *p++ = htonl(stat->f_bsize);
490 *p++ = htonl(stat->f_blocks);
491 *p++ = htonl(stat->f_bfree);
492 *p++ = htonl(stat->f_bavail);
493 return xdr_ressize_check(rqstp, p);
494}
495
496int
497nfssvc_encode_entry(void *ccdv, const char *name,
498 int namlen, loff_t offset, u64 ino, unsigned int d_type)
499{
500 struct readdir_cd *ccd = ccdv;
501 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
502 __be32 *p = cd->buffer;
503 int buflen, slen;
504
505 /*
506 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
507 namlen, name, offset, ino);
508 */
509
510 if (offset > ~((u32) 0)) {
511 cd->common.err = nfserr_fbig;
512 return -EINVAL;
513 }
514 if (cd->offset)
515 *cd->offset = htonl(offset);
516
517 /* truncate filename */
518 namlen = min(namlen, NFS2_MAXNAMLEN);
519 slen = XDR_QUADLEN(namlen);
520
521 if ((buflen = cd->buflen - slen - 4) < 0) {
522 cd->common.err = nfserr_toosmall;
523 return -EINVAL;
524 }
525 if (ino > ~((u32) 0)) {
526 cd->common.err = nfserr_fbig;
527 return -EINVAL;
528 }
529 *p++ = xdr_one; /* mark entry present */
530 *p++ = htonl((u32) ino); /* file id */
531 p = xdr_encode_array(p, name, namlen);/* name length & name */
532 cd->offset = p; /* remember pointer */
533 *p++ = htonl(~0U); /* offset of next entry */
534
535 cd->buflen = buflen;
536 cd->buffer = p;
537 cd->common.err = nfs_ok;
538 return 0;
539}
540
541/*
542 * XDR release functions
543 */
544int
545nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
546 struct nfsd_fhandle *resp)
547{
548 fh_put(&resp->fh);
549 return 1;
550}