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7#include "vfs.h"
8#include "xdr.h"
9#include "auth.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_XDR
12
13
14
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
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
35
36 return p + (NFS_FHSIZE >> 2);
37}
38
39
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
54
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
96
97
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
130
131
132
133
134
135
136
137 if (tmp1 == 1000000)
138 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
139 }
140 return p;
141}
142
143static __be32 *
144encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
145 struct kstat *stat)
146{
147 struct dentry *dentry = fhp->fh_dentry;
148 int type;
149 struct timespec time;
150 u32 f;
151
152 type = (stat->mode & S_IFMT);
153
154 *p++ = htonl(nfs_ftypes[type >> 12]);
155 *p++ = htonl((u32) stat->mode);
156 *p++ = htonl((u32) stat->nlink);
157 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
158 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
159
160 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
161 *p++ = htonl(NFS_MAXPATHLEN);
162 } else {
163 *p++ = htonl((u32) stat->size);
164 }
165 *p++ = htonl((u32) stat->blksize);
166 if (S_ISCHR(type) || S_ISBLK(type))
167 *p++ = htonl(new_encode_dev(stat->rdev));
168 else
169 *p++ = htonl(0xffffffff);
170 *p++ = htonl((u32) stat->blocks);
171 switch (fsid_source(fhp)) {
172 default:
173 case FSIDSOURCE_DEV:
174 *p++ = htonl(new_encode_dev(stat->dev));
175 break;
176 case FSIDSOURCE_FSID:
177 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
178 break;
179 case FSIDSOURCE_UUID:
180 f = ((u32*)fhp->fh_export->ex_uuid)[0];
181 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
182 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
183 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
184 *p++ = htonl(f);
185 break;
186 }
187 *p++ = htonl((u32) stat->ino);
188 *p++ = htonl((u32) stat->atime.tv_sec);
189 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
190 lease_get_mtime(d_inode(dentry), &time);
191 *p++ = htonl((u32) time.tv_sec);
192 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
193 *p++ = htonl((u32) stat->ctime.tv_sec);
194 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
195
196 return p;
197}
198
199
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
207
208int
209nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
210{
211 return xdr_argsize_check(rqstp, p);
212}
213
214int
215nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
216{
217 p = decode_fh(p, &args->fh);
218 if (!p)
219 return 0;
220 return xdr_argsize_check(rqstp, p);
221}
222
223int
224nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
225 struct nfsd_sattrargs *args)
226{
227 p = decode_fh(p, &args->fh);
228 if (!p)
229 return 0;
230 p = decode_sattr(p, &args->attrs);
231
232 return xdr_argsize_check(rqstp, p);
233}
234
235int
236nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
237 struct nfsd_diropargs *args)
238{
239 if (!(p = decode_fh(p, &args->fh))
240 || !(p = decode_filename(p, &args->name, &args->len)))
241 return 0;
242
243 return xdr_argsize_check(rqstp, p);
244}
245
246int
247nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
248 struct nfsd_readargs *args)
249{
250 unsigned int len;
251 int v;
252 p = decode_fh(p, &args->fh);
253 if (!p)
254 return 0;
255
256 args->offset = ntohl(*p++);
257 len = args->count = ntohl(*p++);
258 p++;
259
260 len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
261
262
263
264
265 v=0;
266 while (len > 0) {
267 struct page *p = *(rqstp->rq_next_page++);
268
269 rqstp->rq_vec[v].iov_base = page_address(p);
270 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
271 len -= rqstp->rq_vec[v].iov_len;
272 v++;
273 }
274 args->vlen = v;
275 return xdr_argsize_check(rqstp, p);
276}
277
278int
279nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
280 struct nfsd_writeargs *args)
281{
282 unsigned int len, hdr, dlen;
283 struct kvec *head = rqstp->rq_arg.head;
284 int v;
285
286 p = decode_fh(p, &args->fh);
287 if (!p)
288 return 0;
289
290 p++;
291 args->offset = ntohl(*p++);
292 p++;
293 len = args->len = ntohl(*p++);
294
295
296
297 if (len > NFSSVC_MAXBLKSIZE_V2)
298 return 0;
299
300
301
302
303
304 hdr = (void*)p - head->iov_base;
305 if (hdr > head->iov_len)
306 return 0;
307 dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
308
309
310
311
312
313
314
315
316
317 if (dlen < XDR_QUADLEN(len)*4)
318 return 0;
319
320 rqstp->rq_vec[0].iov_base = (void*)p;
321 rqstp->rq_vec[0].iov_len = head->iov_len - hdr;
322 v = 0;
323 while (len > rqstp->rq_vec[v].iov_len) {
324 len -= rqstp->rq_vec[v].iov_len;
325 v++;
326 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
327 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
328 }
329 rqstp->rq_vec[v].iov_len = len;
330 args->vlen = v + 1;
331 return 1;
332}
333
334int
335nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
336 struct nfsd_createargs *args)
337{
338 if ( !(p = decode_fh(p, &args->fh))
339 || !(p = decode_filename(p, &args->name, &args->len)))
340 return 0;
341 p = decode_sattr(p, &args->attrs);
342
343 return xdr_argsize_check(rqstp, p);
344}
345
346int
347nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
348 struct nfsd_renameargs *args)
349{
350 if (!(p = decode_fh(p, &args->ffh))
351 || !(p = decode_filename(p, &args->fname, &args->flen))
352 || !(p = decode_fh(p, &args->tfh))
353 || !(p = decode_filename(p, &args->tname, &args->tlen)))
354 return 0;
355
356 return xdr_argsize_check(rqstp, p);
357}
358
359int
360nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
361{
362 p = decode_fh(p, &args->fh);
363 if (!p)
364 return 0;
365 args->buffer = page_address(*(rqstp->rq_next_page++));
366
367 return xdr_argsize_check(rqstp, p);
368}
369
370int
371nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
372 struct nfsd_linkargs *args)
373{
374 if (!(p = decode_fh(p, &args->ffh))
375 || !(p = decode_fh(p, &args->tfh))
376 || !(p = decode_filename(p, &args->tname, &args->tlen)))
377 return 0;
378
379 return xdr_argsize_check(rqstp, p);
380}
381
382int
383nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
384 struct nfsd_symlinkargs *args)
385{
386 if ( !(p = decode_fh(p, &args->ffh))
387 || !(p = decode_filename(p, &args->fname, &args->flen))
388 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
389 return 0;
390 p = decode_sattr(p, &args->attrs);
391
392 return xdr_argsize_check(rqstp, p);
393}
394
395int
396nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
397 struct nfsd_readdirargs *args)
398{
399 p = decode_fh(p, &args->fh);
400 if (!p)
401 return 0;
402 args->cookie = ntohl(*p++);
403 args->count = ntohl(*p++);
404 args->count = min_t(u32, args->count, PAGE_SIZE);
405 args->buffer = page_address(*(rqstp->rq_next_page++));
406
407 return xdr_argsize_check(rqstp, p);
408}
409
410
411
412
413int
414nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
415{
416 return xdr_ressize_check(rqstp, p);
417}
418
419int
420nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
421 struct nfsd_attrstat *resp)
422{
423 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
424 return xdr_ressize_check(rqstp, p);
425}
426
427int
428nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
429 struct nfsd_diropres *resp)
430{
431 p = encode_fh(p, &resp->fh);
432 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
433 return xdr_ressize_check(rqstp, p);
434}
435
436int
437nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
438 struct nfsd_readlinkres *resp)
439{
440 *p++ = htonl(resp->len);
441 xdr_ressize_check(rqstp, p);
442 rqstp->rq_res.page_len = resp->len;
443 if (resp->len & 3) {
444
445 rqstp->rq_res.tail[0].iov_base = p;
446 *p = 0;
447 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
448 }
449 return 1;
450}
451
452int
453nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
454 struct nfsd_readres *resp)
455{
456 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
457 *p++ = htonl(resp->count);
458 xdr_ressize_check(rqstp, p);
459
460
461 rqstp->rq_res.page_len = resp->count;
462 if (resp->count & 3) {
463
464 rqstp->rq_res.tail[0].iov_base = p;
465 *p = 0;
466 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
467 }
468 return 1;
469}
470
471int
472nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
473 struct nfsd_readdirres *resp)
474{
475 xdr_ressize_check(rqstp, p);
476 p = resp->buffer;
477 *p++ = 0;
478 *p++ = htonl((resp->common.err == nfserr_eof));
479 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
480
481 return 1;
482}
483
484int
485nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
486 struct nfsd_statfsres *resp)
487{
488 struct kstatfs *stat = &resp->stats;
489
490 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2);
491 *p++ = htonl(stat->f_bsize);
492 *p++ = htonl(stat->f_blocks);
493 *p++ = htonl(stat->f_bfree);
494 *p++ = htonl(stat->f_bavail);
495 return xdr_ressize_check(rqstp, p);
496}
497
498int
499nfssvc_encode_entry(void *ccdv, const char *name,
500 int namlen, loff_t offset, u64 ino, unsigned int d_type)
501{
502 struct readdir_cd *ccd = ccdv;
503 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
504 __be32 *p = cd->buffer;
505 int buflen, slen;
506
507
508
509
510
511
512 if (offset > ~((u32) 0)) {
513 cd->common.err = nfserr_fbig;
514 return -EINVAL;
515 }
516 if (cd->offset)
517 *cd->offset = htonl(offset);
518
519
520 namlen = min(namlen, NFS2_MAXNAMLEN);
521 slen = XDR_QUADLEN(namlen);
522
523 if ((buflen = cd->buflen - slen - 4) < 0) {
524 cd->common.err = nfserr_toosmall;
525 return -EINVAL;
526 }
527 if (ino > ~((u32) 0)) {
528 cd->common.err = nfserr_fbig;
529 return -EINVAL;
530 }
531 *p++ = xdr_one;
532 *p++ = htonl((u32) ino);
533 p = xdr_encode_array(p, name, namlen);
534 cd->offset = p;
535 *p++ = htonl(~0U);
536
537 cd->buflen = buflen;
538 cd->buffer = p;
539 cd->common.err = nfs_ok;
540 return 0;
541}
542
543
544
545
546int
547nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
548 struct nfsd_fhandle *resp)
549{
550 fh_put(&resp->fh);
551 return 1;
552}
553