blob: e3a0797dd56ba16ef65fb2df1c348f4ae7e806e2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfsd/xdr.c
3 *
4 * XDR support for nfsd
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/types.h>
10#include <linux/time.h>
11#include <linux/nfs.h>
12#include <linux/vfs.h>
13#include <linux/sunrpc/xdr.h>
14#include <linux/sunrpc/svc.h>
15#include <linux/nfsd/nfsd.h>
16#include <linux/nfsd/xdr.h>
17#include <linux/mm.h>
18
19#define NFSDDBG_FACILITY NFSDDBG_XDR
20
21
22#ifdef NFSD_OPTIMIZE_SPACE
23# define inline
24#endif
25
26/*
27 * Mapping of S_IF* types to NFS file types
28 */
29static u32 nfs_ftypes[] = {
30 NFNON, NFCHR, NFCHR, NFBAD,
31 NFDIR, NFBAD, NFBLK, NFBAD,
32 NFREG, NFBAD, NFLNK, NFBAD,
33 NFSOCK, NFBAD, NFLNK, NFBAD,
34};
35
36
37/*
38 * XDR functions for basic NFS types
39 */
Arjan van de Ven858119e2006-01-14 13:20:43 -080040static u32 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070041decode_fh(u32 *p, struct svc_fh *fhp)
42{
43 fh_init(fhp, NFS_FHSIZE);
44 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
45 fhp->fh_handle.fh_size = NFS_FHSIZE;
46
47 /* FIXME: Look up export pointer here and verify
48 * Sun Secure RPC if requested */
49 return p + (NFS_FHSIZE >> 2);
50}
51
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +000052/* Helper function for NFSv2 ACL code */
53u32 *nfs2svc_decode_fh(u32 *p, struct svc_fh *fhp)
54{
55 return decode_fh(p, fhp);
56}
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static inline u32 *
59encode_fh(u32 *p, struct svc_fh *fhp)
60{
61 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
62 return p + (NFS_FHSIZE>> 2);
63}
64
65/*
66 * Decode a file name and make sure that the path contains
67 * no slashes or null bytes.
68 */
69static inline u32 *
70decode_filename(u32 *p, char **namp, int *lenp)
71{
72 char *name;
73 int i;
74
75 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
76 for (i = 0, name = *namp; i < *lenp; i++, name++) {
77 if (*name == '\0' || *name == '/')
78 return NULL;
79 }
80 }
81
82 return p;
83}
84
85static inline u32 *
86decode_pathname(u32 *p, char **namp, int *lenp)
87{
88 char *name;
89 int i;
90
91 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
92 for (i = 0, name = *namp; i < *lenp; i++, name++) {
93 if (*name == '\0')
94 return NULL;
95 }
96 }
97
98 return p;
99}
100
101static inline u32 *
102decode_sattr(u32 *p, struct iattr *iap)
103{
104 u32 tmp, tmp1;
105
106 iap->ia_valid = 0;
107
108 /* Sun client bug compatibility check: some sun clients seem to
109 * put 0xffff in the mode field when they mean 0xffffffff.
110 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
111 */
112 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
113 iap->ia_valid |= ATTR_MODE;
114 iap->ia_mode = tmp;
115 }
116 if ((tmp = ntohl(*p++)) != (u32)-1) {
117 iap->ia_valid |= ATTR_UID;
118 iap->ia_uid = tmp;
119 }
120 if ((tmp = ntohl(*p++)) != (u32)-1) {
121 iap->ia_valid |= ATTR_GID;
122 iap->ia_gid = tmp;
123 }
124 if ((tmp = ntohl(*p++)) != (u32)-1) {
125 iap->ia_valid |= ATTR_SIZE;
126 iap->ia_size = tmp;
127 }
128 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
129 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
130 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
131 iap->ia_atime.tv_sec = tmp;
132 iap->ia_atime.tv_nsec = tmp1 * 1000;
133 }
134 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
135 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
136 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
137 iap->ia_mtime.tv_sec = tmp;
138 iap->ia_mtime.tv_nsec = tmp1 * 1000;
139 /*
140 * Passing the invalid value useconds=1000000 for mtime
141 * is a Sun convention for "set both mtime and atime to
142 * current server time". It's needed to make permissions
143 * checks for the "touch" program across v2 mounts to
144 * Solaris and Irix boxes work correctly. See description of
145 * sattr in section 6.1 of "NFS Illustrated" by
146 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
147 */
148 if (tmp1 == 1000000)
149 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
150 }
151 return p;
152}
153
Arjan van de Ven858119e2006-01-14 13:20:43 -0800154static u32 *
David Shawa334de22006-01-06 00:19:58 -0800155encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp,
156 struct kstat *stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 struct dentry *dentry = fhp->fh_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 int type;
160 struct timespec time;
161
David Shawa334de22006-01-06 00:19:58 -0800162 type = (stat->mode & S_IFMT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
164 *p++ = htonl(nfs_ftypes[type >> 12]);
David Shawa334de22006-01-06 00:19:58 -0800165 *p++ = htonl((u32) stat->mode);
166 *p++ = htonl((u32) stat->nlink);
167 *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
168 *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
David Shawa334de22006-01-06 00:19:58 -0800170 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 *p++ = htonl(NFS_MAXPATHLEN);
172 } else {
David Shawa334de22006-01-06 00:19:58 -0800173 *p++ = htonl((u32) stat->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
David Shawa334de22006-01-06 00:19:58 -0800175 *p++ = htonl((u32) stat->blksize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (S_ISCHR(type) || S_ISBLK(type))
David Shawa334de22006-01-06 00:19:58 -0800177 *p++ = htonl(new_encode_dev(stat->rdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 else
179 *p++ = htonl(0xffffffff);
David Shawa334de22006-01-06 00:19:58 -0800180 *p++ = htonl((u32) stat->blocks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (is_fsid(fhp, rqstp->rq_reffh))
182 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
183 else
David Shawa334de22006-01-06 00:19:58 -0800184 *p++ = htonl(new_encode_dev(stat->dev));
185 *p++ = htonl((u32) stat->ino);
186 *p++ = htonl((u32) stat->atime.tv_sec);
187 *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 lease_get_mtime(dentry->d_inode, &time);
189 *p++ = htonl((u32) time.tv_sec);
190 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
David Shawa334de22006-01-06 00:19:58 -0800191 *p++ = htonl((u32) stat->ctime.tv_sec);
192 *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 return p;
195}
196
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000197/* Helper function for NFSv2 ACL code */
198u32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
199{
David Shawa334de22006-01-06 00:19:58 -0800200 struct kstat stat;
201 vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
202 return encode_fattr(rqstp, p, fhp, &stat);
Andreas Gruenbachera257cdd2005-06-22 17:16:26 +0000203}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205/*
206 * XDR decode functions
207 */
208int
209nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
210{
211 return xdr_argsize_check(rqstp, p);
212}
213
214int
215nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *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, u32 *p,
224 struct nfsd_sattrargs *args)
225{
226 if (!(p = decode_fh(p, &args->fh))
227 || !(p = decode_sattr(p, &args->attrs)))
228 return 0;
229
230 return xdr_argsize_check(rqstp, p);
231}
232
233int
234nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *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, u32 *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)
258 len = NFSSVC_MAXBLKSIZE;
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 svc_take_page(rqstp);
267 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
268 args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
269 len -= args->vec[v].iov_len;
270 v++;
271 }
272 args->vlen = v;
273 return xdr_argsize_check(rqstp, p);
274}
275
276int
277nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
278 struct nfsd_writeargs *args)
279{
280 unsigned int len;
281 int v;
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 args->vec[0].iov_base = (void*)p;
290 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
291 (((void*)p) - rqstp->rq_arg.head[0].iov_base);
292 if (len > NFSSVC_MAXBLKSIZE)
293 len = NFSSVC_MAXBLKSIZE;
294 v = 0;
295 while (len > args->vec[v].iov_len) {
296 len -= args->vec[v].iov_len;
297 v++;
298 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
299 args->vec[v].iov_len = PAGE_SIZE;
300 }
301 args->vec[v].iov_len = len;
302 args->vlen = v+1;
303 return args->vec[0].iov_len > 0;
304}
305
306int
307nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
308 struct nfsd_createargs *args)
309{
310 if (!(p = decode_fh(p, &args->fh))
311 || !(p = decode_filename(p, &args->name, &args->len))
312 || !(p = decode_sattr(p, &args->attrs)))
313 return 0;
314
315 return xdr_argsize_check(rqstp, p);
316}
317
318int
319nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
320 struct nfsd_renameargs *args)
321{
322 if (!(p = decode_fh(p, &args->ffh))
323 || !(p = decode_filename(p, &args->fname, &args->flen))
324 || !(p = decode_fh(p, &args->tfh))
325 || !(p = decode_filename(p, &args->tname, &args->tlen)))
326 return 0;
327
328 return xdr_argsize_check(rqstp, p);
329}
330
331int
332nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args)
333{
334 if (!(p = decode_fh(p, &args->fh)))
335 return 0;
336 svc_take_page(rqstp);
337 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
338
339 return xdr_argsize_check(rqstp, p);
340}
341
342int
343nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
344 struct nfsd_linkargs *args)
345{
346 if (!(p = decode_fh(p, &args->ffh))
347 || !(p = decode_fh(p, &args->tfh))
348 || !(p = decode_filename(p, &args->tname, &args->tlen)))
349 return 0;
350
351 return xdr_argsize_check(rqstp, p);
352}
353
354int
355nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
356 struct nfsd_symlinkargs *args)
357{
358 if (!(p = decode_fh(p, &args->ffh))
359 || !(p = decode_filename(p, &args->fname, &args->flen))
360 || !(p = decode_pathname(p, &args->tname, &args->tlen))
361 || !(p = decode_sattr(p, &args->attrs)))
362 return 0;
363
364 return xdr_argsize_check(rqstp, p);
365}
366
367int
368nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
369 struct nfsd_readdirargs *args)
370{
371 if (!(p = decode_fh(p, &args->fh)))
372 return 0;
373 args->cookie = ntohl(*p++);
374 args->count = ntohl(*p++);
375 if (args->count > PAGE_SIZE)
376 args->count = PAGE_SIZE;
377
378 svc_take_page(rqstp);
379 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
380
381 return xdr_argsize_check(rqstp, p);
382}
383
384/*
385 * XDR encode functions
386 */
387int
388nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
389{
390 return xdr_ressize_check(rqstp, p);
391}
392
393int
394nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
395 struct nfsd_attrstat *resp)
396{
David Shawa334de22006-01-06 00:19:58 -0800397 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return xdr_ressize_check(rqstp, p);
399}
400
401int
402nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
403 struct nfsd_diropres *resp)
404{
405 p = encode_fh(p, &resp->fh);
David Shawa334de22006-01-06 00:19:58 -0800406 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 return xdr_ressize_check(rqstp, p);
408}
409
410int
411nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
412 struct nfsd_readlinkres *resp)
413{
414 *p++ = htonl(resp->len);
415 xdr_ressize_check(rqstp, p);
416 rqstp->rq_res.page_len = resp->len;
417 if (resp->len & 3) {
418 /* need to pad the tail */
419 rqstp->rq_restailpage = 0;
420 rqstp->rq_res.tail[0].iov_base = p;
421 *p = 0;
422 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
423 }
424 return 1;
425}
426
427int
428nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
429 struct nfsd_readres *resp)
430{
David Shawa334de22006-01-06 00:19:58 -0800431 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 *p++ = htonl(resp->count);
433 xdr_ressize_check(rqstp, p);
434
435 /* now update rqstp->rq_res to reflect data aswell */
436 rqstp->rq_res.page_len = resp->count;
437 if (resp->count & 3) {
438 /* need to pad the tail */
439 rqstp->rq_restailpage = 0;
440 rqstp->rq_res.tail[0].iov_base = p;
441 *p = 0;
442 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
443 }
444 return 1;
445}
446
447int
448nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
449 struct nfsd_readdirres *resp)
450{
451 xdr_ressize_check(rqstp, p);
452 p = resp->buffer;
453 *p++ = 0; /* no more entries */
454 *p++ = htonl((resp->common.err == nfserr_eof));
455 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
456
457 return 1;
458}
459
460int
461nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
462 struct nfsd_statfsres *resp)
463{
464 struct kstatfs *stat = &resp->stats;
465
466 *p++ = htonl(NFSSVC_MAXBLKSIZE); /* max transfer size */
467 *p++ = htonl(stat->f_bsize);
468 *p++ = htonl(stat->f_blocks);
469 *p++ = htonl(stat->f_bfree);
470 *p++ = htonl(stat->f_bavail);
471 return xdr_ressize_check(rqstp, p);
472}
473
474int
475nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
476 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
477{
478 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
479 u32 *p = cd->buffer;
480 int buflen, slen;
481
482 /*
483 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
484 namlen, name, offset, ino);
485 */
486
487 if (offset > ~((u32) 0)) {
488 cd->common.err = nfserr_fbig;
489 return -EINVAL;
490 }
491 if (cd->offset)
492 *cd->offset = htonl(offset);
493 if (namlen > NFS2_MAXNAMLEN)
494 namlen = NFS2_MAXNAMLEN;/* truncate filename */
495
496 slen = XDR_QUADLEN(namlen);
497 if ((buflen = cd->buflen - slen - 4) < 0) {
498 cd->common.err = nfserr_toosmall;
499 return -EINVAL;
500 }
501 *p++ = xdr_one; /* mark entry present */
502 *p++ = htonl((u32) ino); /* file id */
503 p = xdr_encode_array(p, name, namlen);/* name length & name */
504 cd->offset = p; /* remember pointer */
505 *p++ = ~(u32) 0; /* offset of next entry */
506
507 cd->buflen = buflen;
508 cd->buffer = p;
509 cd->common.err = nfs_ok;
510 return 0;
511}
512
513/*
514 * XDR release functions
515 */
516int
517nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
518 struct nfsd_fhandle *resp)
519{
520 fh_put(&resp->fh);
521 return 1;
522}