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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(dentry->d_inode, &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 if (!(p = decode_fh(p, &args->fh)))
218 return 0;
219 return xdr_argsize_check(rqstp, p);
220}
221
222int
223nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
224 struct nfsd_sattrargs *args)
225{
226 p = decode_fh(p, &args->fh);
227 if (!p)
228 return 0;
229 p = decode_sattr(p, &args->attrs);
230
231 return xdr_argsize_check(rqstp, p);
232}
233
234int
235nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
236 struct nfsd_diropargs *args)
237{
238 if (!(p = decode_fh(p, &args->fh))
239 || !(p = decode_filename(p, &args->name, &args->len)))
240 return 0;
241
242 return xdr_argsize_check(rqstp, p);
243}
244
245int
246nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
247 struct nfsd_readargs *args)
248{
249 unsigned int len;
250 int v;
251 if (!(p = decode_fh(p, &args->fh)))
252 return 0;
253
254 args->offset = ntohl(*p++);
255 len = args->count = ntohl(*p++);
256 p++; /* totalcount - unused */
257
258 if (len > NFSSVC_MAXBLKSIZE_V2)
259 len = NFSSVC_MAXBLKSIZE_V2;
260
261 /* set up somewhere to store response.
262 * We take pages, put them on reslist and include in iovec
263 */
264 v=0;
265 while (len > 0) {
266 struct page *p = *(rqstp->rq_next_page++);
267
268 rqstp->rq_vec[v].iov_base = page_address(p);
269 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
270 len -= rqstp->rq_vec[v].iov_len;
271 v++;
272 }
273 args->vlen = v;
274 return xdr_argsize_check(rqstp, p);
275}
276
277int
278nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
279 struct nfsd_writeargs *args)
280{
281 unsigned int len, hdr, dlen;
282 int v;
283
284 if (!(p = decode_fh(p, &args->fh)))
285 return 0;
286
287 p++; /* beginoffset */
288 args->offset = ntohl(*p++); /* offset */
289 p++; /* totalcount */
290 len = args->len = ntohl(*p++);
291 /*
292 * The protocol specifies a maximum of 8192 bytes.
293 */
294 if (len > NFSSVC_MAXBLKSIZE_V2)
295 return 0;
296
297 /*
298 * Check to make sure that we got the right number of
299 * bytes.
300 */
301 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
302 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
303 - hdr;
304
305 /*
306 * Round the length of the data which was specified up to
307 * the next multiple of XDR units and then compare that
308 * against the length which was actually received.
309 * Note that when RPCSEC/GSS (for example) is used, the
310 * data buffer can be padded so dlen might be larger
311 * than required. It must never be smaller.
312 */
313 if (dlen < XDR_QUADLEN(len)*4)
314 return 0;
315
316 rqstp->rq_vec[0].iov_base = (void*)p;
317 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
318 v = 0;
319 while (len > rqstp->rq_vec[v].iov_len) {
320 len -= rqstp->rq_vec[v].iov_len;
321 v++;
322 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
323 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
324 }
325 rqstp->rq_vec[v].iov_len = len;
326 args->vlen = v + 1;
327 return 1;
328}
329
330int
331nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
332 struct nfsd_createargs *args)
333{
334 if ( !(p = decode_fh(p, &args->fh))
335 || !(p = decode_filename(p, &args->name, &args->len)))
336 return 0;
337 p = decode_sattr(p, &args->attrs);
338
339 return xdr_argsize_check(rqstp, p);
340}
341
342int
343nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
344 struct nfsd_renameargs *args)
345{
346 if (!(p = decode_fh(p, &args->ffh))
347 || !(p = decode_filename(p, &args->fname, &args->flen))
348 || !(p = decode_fh(p, &args->tfh))
349 || !(p = decode_filename(p, &args->tname, &args->tlen)))
350 return 0;
351
352 return xdr_argsize_check(rqstp, p);
353}
354
355int
356nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
357{
358 if (!(p = decode_fh(p, &args->fh)))
359 return 0;
360 args->buffer = page_address(*(rqstp->rq_next_page++));
361
362 return xdr_argsize_check(rqstp, p);
363}
364
365int
366nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
367 struct nfsd_linkargs *args)
368{
369 if (!(p = decode_fh(p, &args->ffh))
370 || !(p = decode_fh(p, &args->tfh))
371 || !(p = decode_filename(p, &args->tname, &args->tlen)))
372 return 0;
373
374 return xdr_argsize_check(rqstp, p);
375}
376
377int
378nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
379 struct nfsd_symlinkargs *args)
380{
381 if ( !(p = decode_fh(p, &args->ffh))
382 || !(p = decode_filename(p, &args->fname, &args->flen))
383 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
384 return 0;
385 p = decode_sattr(p, &args->attrs);
386
387 return xdr_argsize_check(rqstp, p);
388}
389
390int
391nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
392 struct nfsd_readdirargs *args)
393{
394 if (!(p = decode_fh(p, &args->fh)))
395 return 0;
396 args->cookie = ntohl(*p++);
397 args->count = ntohl(*p++);
398 if (args->count > PAGE_SIZE)
399 args->count = PAGE_SIZE;
400
401 args->buffer = page_address(*(rqstp->rq_next_page++));
402
403 return xdr_argsize_check(rqstp, p);
404}
405
406/*
407 * XDR encode functions
408 */
409int
410nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
411{
412 return xdr_ressize_check(rqstp, p);
413}
414
415int
416nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
417 struct nfsd_attrstat *resp)
418{
419 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
420 return xdr_ressize_check(rqstp, p);
421}
422
423int
424nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
425 struct nfsd_diropres *resp)
426{
427 p = encode_fh(p, &resp->fh);
428 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
429 return xdr_ressize_check(rqstp, p);
430}
431
432int
433nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
434 struct nfsd_readlinkres *resp)
435{
436 *p++ = htonl(resp->len);
437 xdr_ressize_check(rqstp, p);
438 rqstp->rq_res.page_len = resp->len;
439 if (resp->len & 3) {
440 /* need to pad the tail */
441 rqstp->rq_res.tail[0].iov_base = p;
442 *p = 0;
443 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
444 }
445 return 1;
446}
447
448int
449nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
450 struct nfsd_readres *resp)
451{
452 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
453 *p++ = htonl(resp->count);
454 xdr_ressize_check(rqstp, p);
455
456 /* now update rqstp->rq_res to reflect data as well */
457 rqstp->rq_res.page_len = resp->count;
458 if (resp->count & 3) {
459 /* need to pad the tail */
460 rqstp->rq_res.tail[0].iov_base = p;
461 *p = 0;
462 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
463 }
464 return 1;
465}
466
467int
468nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
469 struct nfsd_readdirres *resp)
470{
471 xdr_ressize_check(rqstp, p);
472 p = resp->buffer;
473 *p++ = 0; /* no more entries */
474 *p++ = htonl((resp->common.err == nfserr_eof));
475 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
476
477 return 1;
478}
479
480int
481nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
482 struct nfsd_statfsres *resp)
483{
484 struct kstatfs *stat = &resp->stats;
485
486 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
487 *p++ = htonl(stat->f_bsize);
488 *p++ = htonl(stat->f_blocks);
489 *p++ = htonl(stat->f_bfree);
490 *p++ = htonl(stat->f_bavail);
491 return xdr_ressize_check(rqstp, p);
492}
493
494int
495nfssvc_encode_entry(void *ccdv, const char *name,
496 int namlen, loff_t offset, u64 ino, unsigned int d_type)
497{
498 struct readdir_cd *ccd = ccdv;
499 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
500 __be32 *p = cd->buffer;
501 int buflen, slen;
502
503 /*
504 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
505 namlen, name, offset, ino);
506 */
507
508 if (offset > ~((u32) 0)) {
509 cd->common.err = nfserr_fbig;
510 return -EINVAL;
511 }
512 if (cd->offset)
513 *cd->offset = htonl(offset);
514 if (namlen > NFS2_MAXNAMLEN)
515 namlen = NFS2_MAXNAMLEN;/* truncate filename */
516
517 slen = XDR_QUADLEN(namlen);
518 if ((buflen = cd->buflen - slen - 4) < 0) {
519 cd->common.err = nfserr_toosmall;
520 return -EINVAL;
521 }
522 if (ino > ~((u32) 0)) {
523 cd->common.err = nfserr_fbig;
524 return -EINVAL;
525 }
526 *p++ = xdr_one; /* mark entry present */
527 *p++ = htonl((u32) ino); /* file id */
528 p = xdr_encode_array(p, name, namlen);/* name length & name */
529 cd->offset = p; /* remember pointer */
530 *p++ = htonl(~0U); /* offset of next entry */
531
532 cd->buflen = buflen;
533 cd->buffer = p;
534 cd->common.err = nfs_ok;
535 return 0;
536}
537
538/*
539 * XDR release functions
540 */
541int
542nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
543 struct nfsd_fhandle *resp)
544{
545 fh_put(&resp->fh);
546 return 1;
547}
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_base, 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_base, 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
275int
276nfssvc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p)
277{
278 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
279 struct nfsd_fhandle *args = rqstp->rq_argp;
280
281 return svcxdr_decode_fhandle(xdr, &args->fh);
282}
283
284int
285nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
286{
287 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
288 struct nfsd_sattrargs *args = rqstp->rq_argp;
289
290 return svcxdr_decode_fhandle(xdr, &args->fh) &&
291 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
292}
293
294int
295nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
296{
297 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
298 struct nfsd_diropargs *args = rqstp->rq_argp;
299
300 return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len);
301}
302
303int
304nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
305{
306 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
307 struct nfsd_readargs *args = rqstp->rq_argp;
308 u32 totalcount;
309
310 if (!svcxdr_decode_fhandle(xdr, &args->fh))
311 return 0;
312 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
313 return 0;
314 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
315 return 0;
316 /* totalcount is ignored */
317 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
318 return 0;
319
320 return 1;
321}
322
323int
324nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
325{
326 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
327 struct nfsd_writeargs *args = rqstp->rq_argp;
328 struct kvec *head = rqstp->rq_arg.head;
329 struct kvec *tail = rqstp->rq_arg.tail;
330 u32 beginoffset, totalcount;
331 size_t remaining;
332
333 if (!svcxdr_decode_fhandle(xdr, &args->fh))
334 return 0;
335 /* beginoffset is ignored */
336 if (xdr_stream_decode_u32(xdr, &beginoffset) < 0)
337 return 0;
338 if (xdr_stream_decode_u32(xdr, &args->offset) < 0)
339 return 0;
340 /* totalcount is ignored */
341 if (xdr_stream_decode_u32(xdr, &totalcount) < 0)
342 return 0;
343
344 /* opaque data */
345 if (xdr_stream_decode_u32(xdr, &args->len) < 0)
346 return 0;
347 if (args->len > NFSSVC_MAXBLKSIZE_V2)
348 return 0;
349 remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len;
350 remaining -= xdr_stream_pos(xdr);
351 if (remaining < xdr_align_size(args->len))
352 return 0;
353 args->first.iov_base = xdr->p;
354 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
355
356 return 1;
357}
358
359int
360nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
361{
362 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
363 struct nfsd_createargs *args = rqstp->rq_argp;
364
365 return svcxdr_decode_diropargs(xdr, &args->fh,
366 &args->name, &args->len) &&
367 svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
368}
369
370int
371nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
372{
373 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
374 struct nfsd_renameargs *args = rqstp->rq_argp;
375
376 return svcxdr_decode_diropargs(xdr, &args->ffh,
377 &args->fname, &args->flen) &&
378 svcxdr_decode_diropargs(xdr, &args->tfh,
379 &args->tname, &args->tlen);
380}
381
382int
383nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
384{
385 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
386 struct nfsd_linkargs *args = rqstp->rq_argp;
387
388 return svcxdr_decode_fhandle(xdr, &args->ffh) &&
389 svcxdr_decode_diropargs(xdr, &args->tfh,
390 &args->tname, &args->tlen);
391}
392
393int
394nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
395{
396 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
397 struct nfsd_symlinkargs *args = rqstp->rq_argp;
398 struct kvec *head = rqstp->rq_arg.head;
399
400 if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen))
401 return 0;
402 if (xdr_stream_decode_u32(xdr, &args->tlen) < 0)
403 return 0;
404 if (args->tlen == 0)
405 return 0;
406
407 args->first.iov_len = head->iov_len - xdr_stream_pos(xdr);
408 args->first.iov_base = xdr_inline_decode(xdr, args->tlen);
409 if (!args->first.iov_base)
410 return 0;
411 return svcxdr_decode_sattr(rqstp, xdr, &args->attrs);
412}
413
414int
415nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
416{
417 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
418 struct nfsd_readdirargs *args = rqstp->rq_argp;
419
420 if (!svcxdr_decode_fhandle(xdr, &args->fh))
421 return 0;
422 if (xdr_stream_decode_u32(xdr, &args->cookie) < 0)
423 return 0;
424 if (xdr_stream_decode_u32(xdr, &args->count) < 0)
425 return 0;
426
427 return 1;
428}
429
430/*
431 * XDR encode functions
432 */
433
434int
435nfssvc_encode_statres(struct svc_rqst *rqstp, __be32 *p)
436{
437 struct xdr_stream *xdr = &rqstp->rq_res_stream;
438 struct nfsd_stat *resp = rqstp->rq_resp;
439
440 return svcxdr_encode_stat(xdr, resp->status);
441}
442
443int
444nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p)
445{
446 struct xdr_stream *xdr = &rqstp->rq_res_stream;
447 struct nfsd_attrstat *resp = rqstp->rq_resp;
448
449 if (!svcxdr_encode_stat(xdr, resp->status))
450 return 0;
451 switch (resp->status) {
452 case nfs_ok:
453 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
454 return 0;
455 break;
456 }
457
458 return 1;
459}
460
461int
462nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
463{
464 struct xdr_stream *xdr = &rqstp->rq_res_stream;
465 struct nfsd_diropres *resp = rqstp->rq_resp;
466
467 if (!svcxdr_encode_stat(xdr, resp->status))
468 return 0;
469 switch (resp->status) {
470 case nfs_ok:
471 if (!svcxdr_encode_fhandle(xdr, &resp->fh))
472 return 0;
473 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
474 return 0;
475 break;
476 }
477
478 return 1;
479}
480
481int
482nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
483{
484 struct xdr_stream *xdr = &rqstp->rq_res_stream;
485 struct nfsd_readlinkres *resp = rqstp->rq_resp;
486 struct kvec *head = rqstp->rq_res.head;
487
488 if (!svcxdr_encode_stat(xdr, resp->status))
489 return 0;
490 switch (resp->status) {
491 case nfs_ok:
492 if (xdr_stream_encode_u32(xdr, resp->len) < 0)
493 return 0;
494 xdr_write_pages(xdr, &resp->page, 0, resp->len);
495 if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0)
496 return 0;
497 break;
498 }
499
500 return 1;
501}
502
503int
504nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
505{
506 struct xdr_stream *xdr = &rqstp->rq_res_stream;
507 struct nfsd_readres *resp = rqstp->rq_resp;
508 struct kvec *head = rqstp->rq_res.head;
509
510 if (!svcxdr_encode_stat(xdr, resp->status))
511 return 0;
512 switch (resp->status) {
513 case nfs_ok:
514 if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
515 return 0;
516 if (xdr_stream_encode_u32(xdr, resp->count) < 0)
517 return 0;
518 xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base,
519 resp->count);
520 if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0)
521 return 0;
522 break;
523 }
524
525 return 1;
526}
527
528int
529nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
530{
531 struct xdr_stream *xdr = &rqstp->rq_res_stream;
532 struct nfsd_readdirres *resp = rqstp->rq_resp;
533 struct xdr_buf *dirlist = &resp->dirlist;
534
535 if (!svcxdr_encode_stat(xdr, resp->status))
536 return 0;
537 switch (resp->status) {
538 case nfs_ok:
539 xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len);
540 /* no more entries */
541 if (xdr_stream_encode_item_absent(xdr) < 0)
542 return 0;
543 if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0)
544 return 0;
545 break;
546 }
547
548 return 1;
549}
550
551int
552nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
553{
554 struct xdr_stream *xdr = &rqstp->rq_res_stream;
555 struct nfsd_statfsres *resp = rqstp->rq_resp;
556 struct kstatfs *stat = &resp->stats;
557
558 if (!svcxdr_encode_stat(xdr, resp->status))
559 return 0;
560 switch (resp->status) {
561 case nfs_ok:
562 p = xdr_reserve_space(xdr, XDR_UNIT * 5);
563 if (!p)
564 return 0;
565 *p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2);
566 *p++ = cpu_to_be32(stat->f_bsize);
567 *p++ = cpu_to_be32(stat->f_blocks);
568 *p++ = cpu_to_be32(stat->f_bfree);
569 *p = cpu_to_be32(stat->f_bavail);
570 break;
571 }
572
573 return 1;
574}
575
576/**
577 * nfssvc_encode_nfscookie - Encode a directory offset cookie
578 * @resp: readdir result context
579 * @offset: offset cookie to encode
580 *
581 * The buffer space for the offset cookie has already been reserved
582 * by svcxdr_encode_entry_common().
583 */
584void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset)
585{
586 __be32 cookie = cpu_to_be32(offset);
587
588 if (!resp->cookie_offset)
589 return;
590
591 write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie,
592 sizeof(cookie));
593 resp->cookie_offset = 0;
594}
595
596static bool
597svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name,
598 int namlen, loff_t offset, u64 ino)
599{
600 struct xdr_buf *dirlist = &resp->dirlist;
601 struct xdr_stream *xdr = &resp->xdr;
602
603 if (xdr_stream_encode_item_present(xdr) < 0)
604 return false;
605 /* fileid */
606 if (xdr_stream_encode_u32(xdr, (u32)ino) < 0)
607 return false;
608 /* name */
609 if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0)
610 return false;
611 /* cookie */
612 resp->cookie_offset = dirlist->len;
613 if (xdr_stream_encode_u32(xdr, ~0U) < 0)
614 return false;
615
616 return true;
617}
618
619/**
620 * nfssvc_encode_entry - encode one NFSv2 READDIR entry
621 * @data: directory context
622 * @name: name of the object to be encoded
623 * @namlen: length of that name, in bytes
624 * @offset: the offset of the previous entry
625 * @ino: the fileid of this entry
626 * @d_type: unused
627 *
628 * Return values:
629 * %0: Entry was successfully encoded.
630 * %-EINVAL: An encoding problem occured, secondary status code in resp->common.err
631 *
632 * On exit, the following fields are updated:
633 * - resp->xdr
634 * - resp->common.err
635 * - resp->cookie_offset
636 */
637int nfssvc_encode_entry(void *data, const char *name, int namlen,
638 loff_t offset, u64 ino, unsigned int d_type)
639{
640 struct readdir_cd *ccd = data;
641 struct nfsd_readdirres *resp = container_of(ccd,
642 struct nfsd_readdirres,
643 common);
644 unsigned int starting_length = resp->dirlist.len;
645
646 /* The offset cookie for the previous entry */
647 nfssvc_encode_nfscookie(resp, offset);
648
649 if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino))
650 goto out_toosmall;
651
652 xdr_commit_encode(&resp->xdr);
653 resp->common.err = nfs_ok;
654 return 0;
655
656out_toosmall:
657 resp->cookie_offset = 0;
658 resp->common.err = nfserr_toosmall;
659 resp->dirlist.len = starting_length;
660 return -EINVAL;
661}
662
663/*
664 * XDR release functions
665 */
666void nfssvc_release_attrstat(struct svc_rqst *rqstp)
667{
668 struct nfsd_attrstat *resp = rqstp->rq_resp;
669
670 fh_put(&resp->fh);
671}
672
673void nfssvc_release_diropres(struct svc_rqst *rqstp)
674{
675 struct nfsd_diropres *resp = rqstp->rq_resp;
676
677 fh_put(&resp->fh);
678}
679
680void nfssvc_release_readres(struct svc_rqst *rqstp)
681{
682 struct nfsd_readres *resp = rqstp->rq_resp;
683
684 fh_put(&resp->fh);
685}