1 /*
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 */
29 static 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 */
40 static inline u32 *
41 decode_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
52 static inline u32 *
53 encode_fh(u32 *p, struct svc_fh *fhp)
54 {
55 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
56 return p + (NFS_FHSIZE>> 2);
57 }
58
59 /*
60 * Decode a file name and make sure that the path contains
61 * no slashes or null bytes.
62 */
63 static inline u32 *
64 decode_filename(u32 *p, char **namp, int *lenp)
65 {
66 char *name;
67 int i;
68
69 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
70 for (i = 0, name = *namp; i < *lenp; i++, name++) {
71 if (*name == '\0' || *name == '/')
72 return NULL;
73 }
74 }
75
76 return p;
77 }
78
79 static inline u32 *
80 decode_pathname(u32 *p, char **namp, int *lenp)
81 {
82 char *name;
83 int i;
84
85 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
86 for (i = 0, name = *namp; i < *lenp; i++, name++) {
87 if (*name == '\0')
88 return NULL;
89 }
90 }
91
92 return p;
93 }
94
95 static inline u32 *
96 decode_sattr(u32 *p, struct iattr *iap)
97 {
98 u32 tmp, tmp1;
99
100 iap->ia_valid = 0;
101
102 /* Sun client bug compatibility check: some sun clients seem to
103 * put 0xffff in the mode field when they mean 0xffffffff.
104 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
105 */
106 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
107 iap->ia_valid |= ATTR_MODE;
108 iap->ia_mode = tmp;
109 }
110 if ((tmp = ntohl(*p++)) != (u32)-1) {
111 iap->ia_valid |= ATTR_UID;
112 iap->ia_uid = tmp;
113 }
114 if ((tmp = ntohl(*p++)) != (u32)-1) {
115 iap->ia_valid |= ATTR_GID;
116 iap->ia_gid = tmp;
117 }
118 if ((tmp = ntohl(*p++)) != (u32)-1) {
119 iap->ia_valid |= ATTR_SIZE;
120 iap->ia_size = tmp;
121 }
122 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
123 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
124 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
125 iap->ia_atime.tv_sec = tmp;
126 iap->ia_atime.tv_nsec = tmp1 * 1000;
127 }
128 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
129 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
130 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
131 iap->ia_mtime.tv_sec = tmp;
132 iap->ia_mtime.tv_nsec = tmp1 * 1000;
133 /*
134 * Passing the invalid value useconds=1000000 for mtime
135 * is a Sun convention for "set both mtime and atime to
136 * current server time". It's needed to make permissions
137 * checks for the "touch" program across v2 mounts to
138 * Solaris and Irix boxes work correctly. See description of
139 * sattr in section 6.1 of "NFS Illustrated" by
140 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
141 */
142 if (tmp1 == 1000000)
143 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
144 }
145 return p;
146 }
147
148 static inline u32 *
149 encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
150 {
151 struct vfsmount *mnt = fhp->fh_export->ex_mnt;
152 struct dentry *dentry = fhp->fh_dentry;
153 struct kstat stat;
154 int type;
155 struct timespec time;
156
157 vfs_getattr(mnt, dentry, &stat);
158 type = (stat.mode & S_IFMT);
159
160 *p++ = htonl(nfs_ftypes[type >> 12]);
161 *p++ = htonl((u32) stat.mode);
162 *p++ = htonl((u32) stat.nlink);
163 *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid));
164 *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid));
165
166 if (S_ISLNK(type) && stat.size > NFS_MAXPATHLEN) {
167 *p++ = htonl(NFS_MAXPATHLEN);
168 } else {
169 *p++ = htonl((u32) stat.size);
170 }
171 *p++ = htonl((u32) stat.blksize);
172 if (S_ISCHR(type) || S_ISBLK(type))
173 *p++ = htonl(new_encode_dev(stat.rdev));
174 else
175 *p++ = htonl(0xffffffff);
176 *p++ = htonl((u32) stat.blocks);
177 if (is_fsid(fhp, rqstp->rq_reffh))
178 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
179 else
180 *p++ = htonl(new_encode_dev(stat.dev));
181 *p++ = htonl((u32) stat.ino);
182 *p++ = htonl((u32) stat.atime.tv_sec);
183 *p++ = htonl(stat.atime.tv_nsec ? stat.atime.tv_nsec / 1000 : 0);
184 lease_get_mtime(dentry->d_inode, &time);
185 *p++ = htonl((u32) time.tv_sec);
186 *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
187 *p++ = htonl((u32) stat.ctime.tv_sec);
188 *p++ = htonl(stat.ctime.tv_nsec ? stat.ctime.tv_nsec / 1000 : 0);
189
190 return p;
191 }
192
193
194 /*
195 * XDR decode functions
196 */
197 int
198 nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
199 {
200 return xdr_argsize_check(rqstp, p);
201 }
202
203 int
204 nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
205 {
206 if (!(p = decode_fh(p, &args->fh)))
207 return 0;
208 return xdr_argsize_check(rqstp, p);
209 }
210
211 int
212 nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
213 struct nfsd_sattrargs *args)
214 {
215 if (!(p = decode_fh(p, &args->fh))
216 || !(p = decode_sattr(p, &args->attrs)))
217 return 0;
218
219 return xdr_argsize_check(rqstp, p);
220 }
221
222 int
223 nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
224 struct nfsd_diropargs *args)
225 {
226 if (!(p = decode_fh(p, &args->fh))
227 || !(p = decode_filename(p, &args->name, &args->len)))
228 return 0;
229
230 return xdr_argsize_check(rqstp, p);
231 }
232
233 int
234 nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
235 struct nfsd_readargs *args)
236 {
237 unsigned int len;
238 int v,pn;
239 if (!(p = decode_fh(p, &args->fh)))
240 return 0;
241
242 args->offset = ntohl(*p++);
243 len = args->count = ntohl(*p++);
244 p++; /* totalcount - unused */
245
246 if (len > NFSSVC_MAXBLKSIZE)
247 len = NFSSVC_MAXBLKSIZE;
248
249 /* set up somewhere to store response.
250 * We take pages, put them on reslist and include in iovec
251 */
252 v=0;
253 while (len > 0) {
254 pn=rqstp->rq_resused;
255 svc_take_page(rqstp);
256 args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
257 args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
258 len -= args->vec[v].iov_len;
259 v++;
260 }
261 args->vlen = v;
262 return xdr_argsize_check(rqstp, p);
263 }
264
265 int
266 nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
267 struct nfsd_writeargs *args)
268 {
269 unsigned int len;
270 int v;
271 if (!(p = decode_fh(p, &args->fh)))
272 return 0;
273
274 p++; /* beginoffset */
275 args->offset = ntohl(*p++); /* offset */
276 p++; /* totalcount */
277 len = args->len = ntohl(*p++);
278 args->vec[0].iov_base = (void*)p;
279 args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
280 (((void*)p) - rqstp->rq_arg.head[0].iov_base);
281 if (len > NFSSVC_MAXBLKSIZE)
282 len = NFSSVC_MAXBLKSIZE;
283 v = 0;
284 while (len > args->vec[v].iov_len) {
285 len -= args->vec[v].iov_len;
286 v++;
287 args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
288 args->vec[v].iov_len = PAGE_SIZE;
289 }
290 args->vec[v].iov_len = len;
291 args->vlen = v+1;
292 return args->vec[0].iov_len > 0;
293 }
294
295 int
296 nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
297 struct nfsd_createargs *args)
298 {
299 if (!(p = decode_fh(p, &args->fh))
300 || !(p = decode_filename(p, &args->name, &args->len))
301 || !(p = decode_sattr(p, &args->attrs)))
302 return 0;
303
304 return xdr_argsize_check(rqstp, p);
305 }
306
307 int
308 nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
309 struct nfsd_renameargs *args)
310 {
311 if (!(p = decode_fh(p, &args->ffh))
312 || !(p = decode_filename(p, &args->fname, &args->flen))
313 || !(p = decode_fh(p, &args->tfh))
314 || !(p = decode_filename(p, &args->tname, &args->tlen)))
315 return 0;
316
317 return xdr_argsize_check(rqstp, p);
318 }
319
320 int
321 nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args)
322 {
323 if (!(p = decode_fh(p, &args->fh)))
324 return 0;
325 svc_take_page(rqstp);
326 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
327
328 return xdr_argsize_check(rqstp, p);
329 }
330
331 int
332 nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
333 struct nfsd_linkargs *args)
334 {
335 if (!(p = decode_fh(p, &args->ffh))
336 || !(p = decode_fh(p, &args->tfh))
337 || !(p = decode_filename(p, &args->tname, &args->tlen)))
338 return 0;
339
340 return xdr_argsize_check(rqstp, p);
341 }
342
343 int
344 nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
345 struct nfsd_symlinkargs *args)
346 {
347 if (!(p = decode_fh(p, &args->ffh))
348 || !(p = decode_filename(p, &args->fname, &args->flen))
349 || !(p = decode_pathname(p, &args->tname, &args->tlen))
350 || !(p = decode_sattr(p, &args->attrs)))
351 return 0;
352
353 return xdr_argsize_check(rqstp, p);
354 }
355
356 int
357 nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
358 struct nfsd_readdirargs *args)
359 {
360 if (!(p = decode_fh(p, &args->fh)))
361 return 0;
362 args->cookie = ntohl(*p++);
363 args->count = ntohl(*p++);
364 if (args->count > PAGE_SIZE)
365 args->count = PAGE_SIZE;
366
367 svc_take_page(rqstp);
368 args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);
369
370 return xdr_argsize_check(rqstp, p);
371 }
372
373 /*
374 * XDR encode functions
375 */
376 int
377 nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
378 {
379 return xdr_ressize_check(rqstp, p);
380 }
381
382 int
383 nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
384 struct nfsd_attrstat *resp)
385 {
386 p = encode_fattr(rqstp, p, &resp->fh);
387 return xdr_ressize_check(rqstp, p);
388 }
389
390 int
391 nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
392 struct nfsd_diropres *resp)
393 {
394 p = encode_fh(p, &resp->fh);
395 p = encode_fattr(rqstp, p, &resp->fh);
396 return xdr_ressize_check(rqstp, p);
397 }
398
399 int
400 nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
401 struct nfsd_readlinkres *resp)
402 {
403 *p++ = htonl(resp->len);
404 xdr_ressize_check(rqstp, p);
405 rqstp->rq_res.page_len = resp->len;
406 if (resp->len & 3) {
407 /* need to pad the tail */
408 rqstp->rq_restailpage = 0;
409 rqstp->rq_res.tail[0].iov_base = p;
410 *p = 0;
411 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
412 }
413 return 1;
414 }
415
416 int
417 nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
418 struct nfsd_readres *resp)
419 {
420 p = encode_fattr(rqstp, p, &resp->fh);
421 *p++ = htonl(resp->count);
422 xdr_ressize_check(rqstp, p);
423
424 /* now update rqstp->rq_res to reflect data aswell */
425 rqstp->rq_res.page_len = resp->count;
426 if (resp->count & 3) {
427 /* need to pad the tail */
428 rqstp->rq_restailpage = 0;
429 rqstp->rq_res.tail[0].iov_base = p;
430 *p = 0;
431 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
432 }
433 return 1;
434 }
435
436 int
437 nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
438 struct nfsd_readdirres *resp)
439 {
440 xdr_ressize_check(rqstp, p);
441 p = resp->buffer;
442 *p++ = 0; /* no more entries */
443 *p++ = htonl((resp->common.err == nfserr_eof));
444 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
445
446 return 1;
447 }
448
449 int
450 nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
451 struct nfsd_statfsres *resp)
452 {
453 struct kstatfs *stat = &resp->stats;
454
455 *p++ = htonl(NFSSVC_MAXBLKSIZE); /* max transfer size */
456 *p++ = htonl(stat->f_bsize);
457 *p++ = htonl(stat->f_blocks);
458 *p++ = htonl(stat->f_bfree);
459 *p++ = htonl(stat->f_bavail);
460 return xdr_ressize_check(rqstp, p);
461 }
462
463 int
464 nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
465 int namlen, loff_t offset, ino_t ino, unsigned int d_type)
466 {
467 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
468 u32 *p = cd->buffer;
469 int buflen, slen;
470
471 /*
472 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
473 namlen, name, offset, ino);
474 */
475
476 if (offset > ~((u32) 0)) {
477 cd->common.err = nfserr_fbig;
478 return -EINVAL;
479 }
480 if (cd->offset)
481 *cd->offset = htonl(offset);
482 if (namlen > NFS2_MAXNAMLEN)
483 namlen = NFS2_MAXNAMLEN;/* truncate filename */
484
485 slen = XDR_QUADLEN(namlen);
486 if ((buflen = cd->buflen - slen - 4) < 0) {
487 cd->common.err = nfserr_toosmall;
488 return -EINVAL;
489 }
490 *p++ = xdr_one; /* mark entry present */
491 *p++ = htonl((u32) ino); /* file id */
492 p = xdr_encode_array(p, name, namlen);/* name length & name */
493 cd->offset = p; /* remember pointer */
494 *p++ = ~(u32) 0; /* offset of next entry */
495
496 cd->buflen = buflen;
497 cd->buffer = p;
498 cd->common.err = nfs_ok;
499 return 0;
500 }
501
502 /*
503 * XDR release functions
504 */
505 int
506 nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
507 struct nfsd_fhandle *resp)
508 {
509 fh_put(&resp->fh);
510 return 1;
511 }
512
|
This page was automatically generated by the
LXR engine.
|