Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | } |