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