Loading...
1/*
2 * XDR support for nfsd
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include "xdr.h"
8#include "auth.h"
9
10#define NFSDDBG_FACILITY NFSDDBG_XDR
11
12/*
13 * Mapping of S_IF* types to NFS file types
14 */
15static 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 * XDR functions for basic NFS types
25 */
26static __be32 *
27decode_fh(__be32 *p, struct svc_fh *fhp)
28{
29 fh_init(fhp, NFS_FHSIZE);
30 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
31 fhp->fh_handle.fh_size = NFS_FHSIZE;
32
33 /* FIXME: Look up export pointer here and verify
34 * Sun Secure RPC if requested */
35 return p + (NFS_FHSIZE >> 2);
36}
37
38/* Helper function for NFSv2 ACL code */
39__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
40{
41 return decode_fh(p, fhp);
42}
43
44static __be32 *
45encode_fh(__be32 *p, struct svc_fh *fhp)
46{
47 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
48 return p + (NFS_FHSIZE>> 2);
49}
50
51/*
52 * Decode a file name and make sure that the path contains
53 * no slashes or null bytes.
54 */
55static __be32 *
56decode_filename(__be32 *p, char **namp, unsigned int *lenp)
57{
58 char *name;
59 unsigned int i;
60
61 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
62 for (i = 0, name = *namp; i < *lenp; i++, name++) {
63 if (*name == '\0' || *name == '/')
64 return NULL;
65 }
66 }
67
68 return p;
69}
70
71static __be32 *
72decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
73{
74 char *name;
75 unsigned int i;
76
77 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
78 for (i = 0, name = *namp; i < *lenp; i++, name++) {
79 if (*name == '\0')
80 return NULL;
81 }
82 }
83
84 return p;
85}
86
87static __be32 *
88decode_sattr(__be32 *p, struct iattr *iap)
89{
90 u32 tmp, tmp1;
91
92 iap->ia_valid = 0;
93
94 /* Sun client bug compatibility check: some sun clients seem to
95 * put 0xffff in the mode field when they mean 0xffffffff.
96 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
97 */
98 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
99 iap->ia_valid |= ATTR_MODE;
100 iap->ia_mode = tmp;
101 }
102 if ((tmp = ntohl(*p++)) != (u32)-1) {
103 iap->ia_valid |= ATTR_UID;
104 iap->ia_uid = tmp;
105 }
106 if ((tmp = ntohl(*p++)) != (u32)-1) {
107 iap->ia_valid |= ATTR_GID;
108 iap->ia_gid = tmp;
109 }
110 if ((tmp = ntohl(*p++)) != (u32)-1) {
111 iap->ia_valid |= ATTR_SIZE;
112 iap->ia_size = tmp;
113 }
114 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
115 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
116 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
117 iap->ia_atime.tv_sec = tmp;
118 iap->ia_atime.tv_nsec = tmp1 * 1000;
119 }
120 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
121 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
122 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
123 iap->ia_mtime.tv_sec = tmp;
124 iap->ia_mtime.tv_nsec = tmp1 * 1000;
125 /*
126 * Passing the invalid value useconds=1000000 for mtime
127 * is a Sun convention for "set both mtime and atime to
128 * current server time". It's needed to make permissions
129 * checks for the "touch" program across v2 mounts to
130 * Solaris and Irix boxes work correctly. See description of
131 * sattr in section 6.1 of "NFS Illustrated" by
132 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
133 */
134 if (tmp1 == 1000000)
135 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
136 }
137 return p;
138}
139
140static __be32 *
141encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
142 struct kstat *stat)
143{
144 struct dentry *dentry = fhp->fh_dentry;
145 int type;
146 struct timespec time;
147 u32 f;
148
149 type = (stat->mode & S_IFMT);
150
151 *p++ = htonl(nfs_ftypes[type >> 12]);
152 *p++ = htonl((u32) stat->mode);
153 *p++ = htonl((u32) stat->nlink);
154 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
155 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
156
157 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
158 *p++ = htonl(NFS_MAXPATHLEN);
159 } else {
160 *p++ = htonl((u32) stat->size);
161 }
162 *p++ = htonl((u32) stat->blksize);
163 if (S_ISCHR(type) || S_ISBLK(type))
164 *p++ = htonl(new_encode_dev(stat->rdev));
165 else
166 *p++ = htonl(0xffffffff);
167 *p++ = htonl((u32) stat->blocks);
168 switch (fsid_source(fhp)) {
169 default:
170 case FSIDSOURCE_DEV:
171 *p++ = htonl(new_encode_dev(stat->dev));
172 break;
173 case FSIDSOURCE_FSID:
174 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
175 break;
176 case FSIDSOURCE_UUID:
177 f = ((u32*)fhp->fh_export->ex_uuid)[0];
178 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
179 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
180 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
181 *p++ = htonl(f);
182 break;
183 }
184 *p++ = htonl((u32) stat->ino);
185 *p++ = htonl((u32) stat->atime.tv_sec);
186 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
187 lease_get_mtime(dentry->d_inode, &time);
188 *p++ = htonl((u32) time.tv_sec);
189 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
190 *p++ = htonl((u32) stat->ctime.tv_sec);
191 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
192
193 return p;
194}
195
196/* Helper function for NFSv2 ACL code */
197__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
198{
199 struct kstat stat;
200 vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat);
201 return encode_fattr(rqstp, p, fhp, &stat);
202}
203
204/*
205 * XDR decode functions
206 */
207int
208nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
209{
210 return xdr_argsize_check(rqstp, p);
211}
212
213int
214nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
215{
216 if (!(p = decode_fh(p, &args->fh)))
217 return 0;
218 return xdr_argsize_check(rqstp, p);
219}
220
221int
222nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
223 struct nfsd_sattrargs *args)
224{
225 p = decode_fh(p, &args->fh);
226 if (!p)
227 return 0;
228 p = decode_sattr(p, &args->attrs);
229
230 return xdr_argsize_check(rqstp, p);
231}
232
233int
234nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
235 struct nfsd_diropargs *args)
236{
237 if (!(p = decode_fh(p, &args->fh))
238 || !(p = decode_filename(p, &args->name, &args->len)))
239 return 0;
240
241 return xdr_argsize_check(rqstp, p);
242}
243
244int
245nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
246 struct nfsd_readargs *args)
247{
248 unsigned int len;
249 int v,pn;
250 if (!(p = decode_fh(p, &args->fh)))
251 return 0;
252
253 args->offset = ntohl(*p++);
254 len = args->count = ntohl(*p++);
255 p++; /* totalcount - unused */
256
257 if (len > NFSSVC_MAXBLKSIZE_V2)
258 len = NFSSVC_MAXBLKSIZE_V2;
259
260 /* set up somewhere to store response.
261 * We take pages, put them on reslist and include in iovec
262 */
263 v=0;
264 while (len > 0) {
265 pn = rqstp->rq_resused++;
266 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
267 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
268 len -= rqstp->rq_vec[v].iov_len;
269 v++;
270 }
271 args->vlen = v;
272 return xdr_argsize_check(rqstp, p);
273}
274
275int
276nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
277 struct nfsd_writeargs *args)
278{
279 unsigned int len, hdr, dlen;
280 int v;
281
282 if (!(p = decode_fh(p, &args->fh)))
283 return 0;
284
285 p++; /* beginoffset */
286 args->offset = ntohl(*p++); /* offset */
287 p++; /* totalcount */
288 len = args->len = ntohl(*p++);
289 /*
290 * The protocol specifies a maximum of 8192 bytes.
291 */
292 if (len > NFSSVC_MAXBLKSIZE_V2)
293 return 0;
294
295 /*
296 * Check to make sure that we got the right number of
297 * bytes.
298 */
299 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
300 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
301 - hdr;
302
303 /*
304 * Round the length of the data which was specified up to
305 * the next multiple of XDR units and then compare that
306 * against the length which was actually received.
307 * Note that when RPCSEC/GSS (for example) is used, the
308 * data buffer can be padded so dlen might be larger
309 * than required. It must never be smaller.
310 */
311 if (dlen < XDR_QUADLEN(len)*4)
312 return 0;
313
314 rqstp->rq_vec[0].iov_base = (void*)p;
315 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
316 v = 0;
317 while (len > rqstp->rq_vec[v].iov_len) {
318 len -= rqstp->rq_vec[v].iov_len;
319 v++;
320 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
321 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
322 }
323 rqstp->rq_vec[v].iov_len = len;
324 args->vlen = v + 1;
325 return 1;
326}
327
328int
329nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
330 struct nfsd_createargs *args)
331{
332 if ( !(p = decode_fh(p, &args->fh))
333 || !(p = decode_filename(p, &args->name, &args->len)))
334 return 0;
335 p = decode_sattr(p, &args->attrs);
336
337 return xdr_argsize_check(rqstp, p);
338}
339
340int
341nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
342 struct nfsd_renameargs *args)
343{
344 if (!(p = decode_fh(p, &args->ffh))
345 || !(p = decode_filename(p, &args->fname, &args->flen))
346 || !(p = decode_fh(p, &args->tfh))
347 || !(p = decode_filename(p, &args->tname, &args->tlen)))
348 return 0;
349
350 return xdr_argsize_check(rqstp, p);
351}
352
353int
354nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
355{
356 if (!(p = decode_fh(p, &args->fh)))
357 return 0;
358 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
359
360 return xdr_argsize_check(rqstp, p);
361}
362
363int
364nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
365 struct nfsd_linkargs *args)
366{
367 if (!(p = decode_fh(p, &args->ffh))
368 || !(p = decode_fh(p, &args->tfh))
369 || !(p = decode_filename(p, &args->tname, &args->tlen)))
370 return 0;
371
372 return xdr_argsize_check(rqstp, p);
373}
374
375int
376nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
377 struct nfsd_symlinkargs *args)
378{
379 if ( !(p = decode_fh(p, &args->ffh))
380 || !(p = decode_filename(p, &args->fname, &args->flen))
381 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
382 return 0;
383 p = decode_sattr(p, &args->attrs);
384
385 return xdr_argsize_check(rqstp, p);
386}
387
388int
389nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
390 struct nfsd_readdirargs *args)
391{
392 if (!(p = decode_fh(p, &args->fh)))
393 return 0;
394 args->cookie = ntohl(*p++);
395 args->count = ntohl(*p++);
396 if (args->count > PAGE_SIZE)
397 args->count = PAGE_SIZE;
398
399 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]);
400
401 return xdr_argsize_check(rqstp, p);
402}
403
404/*
405 * XDR encode functions
406 */
407int
408nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
409{
410 return xdr_ressize_check(rqstp, p);
411}
412
413int
414nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
415 struct nfsd_attrstat *resp)
416{
417 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
418 return xdr_ressize_check(rqstp, p);
419}
420
421int
422nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
423 struct nfsd_diropres *resp)
424{
425 p = encode_fh(p, &resp->fh);
426 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
427 return xdr_ressize_check(rqstp, p);
428}
429
430int
431nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
432 struct nfsd_readlinkres *resp)
433{
434 *p++ = htonl(resp->len);
435 xdr_ressize_check(rqstp, p);
436 rqstp->rq_res.page_len = resp->len;
437 if (resp->len & 3) {
438 /* need to pad the tail */
439 rqstp->rq_res.tail[0].iov_base = p;
440 *p = 0;
441 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
442 }
443 return 1;
444}
445
446int
447nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
448 struct nfsd_readres *resp)
449{
450 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
451 *p++ = htonl(resp->count);
452 xdr_ressize_check(rqstp, p);
453
454 /* now update rqstp->rq_res to reflect data as well */
455 rqstp->rq_res.page_len = resp->count;
456 if (resp->count & 3) {
457 /* need to pad the tail */
458 rqstp->rq_res.tail[0].iov_base = p;
459 *p = 0;
460 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
461 }
462 return 1;
463}
464
465int
466nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
467 struct nfsd_readdirres *resp)
468{
469 xdr_ressize_check(rqstp, p);
470 p = resp->buffer;
471 *p++ = 0; /* no more entries */
472 *p++ = htonl((resp->common.err == nfserr_eof));
473 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
474
475 return 1;
476}
477
478int
479nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
480 struct nfsd_statfsres *resp)
481{
482 struct kstatfs *stat = &resp->stats;
483
484 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
485 *p++ = htonl(stat->f_bsize);
486 *p++ = htonl(stat->f_blocks);
487 *p++ = htonl(stat->f_bfree);
488 *p++ = htonl(stat->f_bavail);
489 return xdr_ressize_check(rqstp, p);
490}
491
492int
493nfssvc_encode_entry(void *ccdv, const char *name,
494 int namlen, loff_t offset, u64 ino, unsigned int d_type)
495{
496 struct readdir_cd *ccd = ccdv;
497 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
498 __be32 *p = cd->buffer;
499 int buflen, slen;
500
501 /*
502 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
503 namlen, name, offset, ino);
504 */
505
506 if (offset > ~((u32) 0)) {
507 cd->common.err = nfserr_fbig;
508 return -EINVAL;
509 }
510 if (cd->offset)
511 *cd->offset = htonl(offset);
512 if (namlen > NFS2_MAXNAMLEN)
513 namlen = NFS2_MAXNAMLEN;/* truncate filename */
514
515 slen = XDR_QUADLEN(namlen);
516 if ((buflen = cd->buflen - slen - 4) < 0) {
517 cd->common.err = nfserr_toosmall;
518 return -EINVAL;
519 }
520 if (ino > ~((u32) 0)) {
521 cd->common.err = nfserr_fbig;
522 return -EINVAL;
523 }
524 *p++ = xdr_one; /* mark entry present */
525 *p++ = htonl((u32) ino); /* file id */
526 p = xdr_encode_array(p, name, namlen);/* name length & name */
527 cd->offset = p; /* remember pointer */
528 *p++ = htonl(~0U); /* offset of next entry */
529
530 cd->buflen = buflen;
531 cd->buffer = p;
532 cd->common.err = nfs_ok;
533 return 0;
534}
535
536/*
537 * XDR release functions
538 */
539int
540nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
541 struct nfsd_fhandle *resp)
542{
543 fh_put(&resp->fh);
544 return 1;
545}
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 svcxdr_encode_opaque_pages(rqstp, xdr, &resp->page, 0,
472 resp->len);
473 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
474 return false;
475 break;
476 }
477
478 return true;
479}
480
481bool
482nfssvc_encode_readres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
483{
484 struct nfsd_readres *resp = rqstp->rq_resp;
485 struct kvec *head = rqstp->rq_res.head;
486
487 if (!svcxdr_encode_stat(xdr, resp->status))
488 return false;
489 switch (resp->status) {
490 case nfs_ok:
491 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
492 return false;
493 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
494 return false;
495 svcxdr_encode_opaque_pages(rqstp, xdr, resp->pages,
496 rqstp->rq_res.page_base,
497 resp->count);
498 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
499 return false;
500 break;
501 }
502
503 return true;
504}
505
506bool
507nfssvc_encode_readdirres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
508{
509 struct nfsd_readdirres *resp = rqstp->rq_resp;
510 struct xdr_buf *dirlist = &resp->dirlist;
511
512 if (!svcxdr_encode_stat(xdr, resp->status))
513 return false;
514 switch (resp->status) {
515 case nfs_ok:
516 svcxdr_encode_opaque_pages(rqstp, xdr, dirlist->pages, 0,
517 dirlist->len);
518 /* no more entries */
519 if (xdr_stream_encode_item_absent(xdr) < 0)
520 return false;
521 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
522 return false;
523 break;
524 }
525
526 return true;
527}
528
529bool
530nfssvc_encode_statfsres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
531{
532 struct nfsd_statfsres *resp = rqstp->rq_resp;
533 struct kstatfs *stat = &resp->stats;
534 __be32 *p;
535
536 if (!svcxdr_encode_stat(xdr, resp->status))
537 return false;
538 switch (resp->status) {
539 case nfs_ok:
540 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
541 if (!p)
542 return false;
543 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
544 *p++ = cpu_to_be32(stat->f_bsize);
545 *p++ = cpu_to_be32(stat->f_blocks);
546 *p++ = cpu_to_be32(stat->f_bfree);
547 *p = cpu_to_be32(stat->f_bavail);
548 break;
549 }
550
551 return true;
552}
553
554/**
555 * nfssvc_encode_nfscookie - Encode a directory offset cookie
556 * @resp: readdir result context
557 * @offset: offset cookie to encode
558 *
559 * The buffer space for the offset cookie has already been reserved
560 * by svcxdr_encode_entry_common().
561 */
562void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
563{
564 __be32 cookie = cpu_to_be32(offset);
565
566 if (!resp->cookie_offset)
567 return;
568
569 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
570 sizeof(cookie));
571 resp->cookie_offset = 0;
572}
573
574static bool
575svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
576 int namlen, loff_t offset, u64 ino)
577{
578 struct xdr_buf *dirlist = &resp->dirlist;
579 struct xdr_stream *xdr = &resp->xdr;
580
581 if (xdr_stream_encode_item_present(xdr) < 0)
582 return false;
583 /* fileid */
584 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
585 return false;
586 /* name */
587 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
588 return false;
589 /* cookie */
590 resp->cookie_offset = dirlist->len;
591 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
592 return false;
593
594 return true;
595}
596
597/**
598 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
599 * @data: directory context
600 * @name: name of the object to be encoded
601 * @namlen: length of that name, in bytes
602 * @offset: the offset of the previous entry
603 * @ino: the fileid of this entry
604 * @d_type: unused
605 *
606 * Return values:
607 * %0: Entry was successfully encoded.
608 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
609 *
610 * On exit, the following fields are updated:
611 * - resp->xdr
612 * - resp->common.err
613 * - resp->cookie_offset
614 */
615int nfssvc_encode_entry(void *data, const char *name, int namlen,
616 loff_t offset, u64 ino, unsigned int d_type)
617{
618 struct readdir_cd *ccd = data;
619 struct nfsd_readdirres *resp = container_of(ccd,
620 struct nfsd_readdirres,
621 common);
622 unsigned int starting_length = resp->dirlist.len;
623
624 /* The offset cookie for the previous entry */
625 nfssvc_encode_nfscookie(resp, offset);
626
627 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
628 goto out_toosmall;
629
630 xdr_commit_encode(&resp->xdr);
631 resp->common.err = nfs_ok;
632 return 0;
633
634out_toosmall:
635 resp->cookie_offset = 0;
636 resp->common.err = nfserr_toosmall;
637 resp->dirlist.len = starting_length;
638 return -EINVAL;
639}
640
641/*
642 * XDR release functions
643 */
644void nfssvc_release_attrstat(struct svc_rqst *rqstp)
645{
646 struct nfsd_attrstat *resp = rqstp->rq_resp;
647
648 fh_put(&resp->fh);
649}
650
651void nfssvc_release_diropres(struct svc_rqst *rqstp)
652{
653 struct nfsd_diropres *resp = rqstp->rq_resp;
654
655 fh_put(&resp->fh);
656}
657
658void nfssvc_release_readres(struct svc_rqst *rqstp)
659{
660 struct nfsd_readres *resp = rqstp->rq_resp;
661
662 fh_put(&resp->fh);
663}