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Commit | Line | Data |
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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 "xdr.h" | |
8 | #include "auth.h" | |
9 | ||
10 | #define NFSDDBG_FACILITY NFSDDBG_XDR | |
11 | ||
12 | /* | |
13 | * Mapping of S_IF* types to NFS file types | |
14 | */ | |
15 | static u32 nfs_ftypes[] = { | |
16 | NFNON, NFCHR, NFCHR, NFBAD, | |
17 | NFDIR, NFBAD, NFBLK, NFBAD, | |
18 | NFREG, NFBAD, NFLNK, NFBAD, | |
19 | NFSOCK, NFBAD, NFLNK, NFBAD, | |
20 | }; | |
21 | ||
22 | ||
23 | /* | |
24 | * XDR functions for basic NFS types | |
25 | */ | |
26 | static __be32 * | |
27 | decode_fh(__be32 *p, struct svc_fh *fhp) | |
28 | { | |
29 | fh_init(fhp, NFS_FHSIZE); | |
30 | memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE); | |
31 | fhp->fh_handle.fh_size = NFS_FHSIZE; | |
32 | ||
33 | /* FIXME: Look up export pointer here and verify | |
34 | * Sun Secure RPC if requested */ | |
35 | return p + (NFS_FHSIZE >> 2); | |
36 | } | |
37 | ||
38 | /* Helper function for NFSv2 ACL code */ | |
39 | __be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp) | |
40 | { | |
41 | return decode_fh(p, fhp); | |
42 | } | |
43 | ||
44 | static __be32 * | |
45 | encode_fh(__be32 *p, struct svc_fh *fhp) | |
46 | { | |
47 | memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); | |
48 | return p + (NFS_FHSIZE>> 2); | |
49 | } | |
50 | ||
51 | /* | |
52 | * Decode a file name and make sure that the path contains | |
53 | * no slashes or null bytes. | |
54 | */ | |
55 | static __be32 * | |
56 | decode_filename(__be32 *p, char **namp, unsigned int *lenp) | |
57 | { | |
58 | char *name; | |
59 | unsigned int i; | |
60 | ||
61 | if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) { | |
62 | for (i = 0, name = *namp; i < *lenp; i++, name++) { | |
63 | if (*name == '\0' || *name == '/') | |
64 | return NULL; | |
65 | } | |
66 | } | |
67 | ||
68 | return p; | |
69 | } | |
70 | ||
71 | static __be32 * | |
72 | decode_pathname(__be32 *p, char **namp, unsigned int *lenp) | |
73 | { | |
74 | char *name; | |
75 | unsigned int i; | |
76 | ||
77 | if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) { | |
78 | for (i = 0, name = *namp; i < *lenp; i++, name++) { | |
79 | if (*name == '\0') | |
80 | return NULL; | |
81 | } | |
82 | } | |
83 | ||
84 | return p; | |
85 | } | |
86 | ||
87 | static __be32 * | |
88 | decode_sattr(__be32 *p, struct iattr *iap) | |
89 | { | |
90 | u32 tmp, tmp1; | |
91 | ||
92 | iap->ia_valid = 0; | |
93 | ||
94 | /* Sun client bug compatibility check: some sun clients seem to | |
95 | * put 0xffff in the mode field when they mean 0xffffffff. | |
96 | * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah. | |
97 | */ | |
98 | if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) { | |
99 | iap->ia_valid |= ATTR_MODE; | |
100 | iap->ia_mode = tmp; | |
101 | } | |
102 | if ((tmp = ntohl(*p++)) != (u32)-1) { | |
103 | iap->ia_valid |= ATTR_UID; | |
104 | iap->ia_uid = tmp; | |
105 | } | |
106 | if ((tmp = ntohl(*p++)) != (u32)-1) { | |
107 | iap->ia_valid |= ATTR_GID; | |
108 | iap->ia_gid = tmp; | |
109 | } | |
110 | if ((tmp = ntohl(*p++)) != (u32)-1) { | |
111 | iap->ia_valid |= ATTR_SIZE; | |
112 | iap->ia_size = tmp; | |
113 | } | |
114 | tmp = ntohl(*p++); tmp1 = ntohl(*p++); | |
115 | if (tmp != (u32)-1 && tmp1 != (u32)-1) { | |
116 | iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; | |
117 | iap->ia_atime.tv_sec = tmp; | |
118 | iap->ia_atime.tv_nsec = tmp1 * 1000; | |
119 | } | |
120 | tmp = ntohl(*p++); tmp1 = ntohl(*p++); | |
121 | if (tmp != (u32)-1 && tmp1 != (u32)-1) { | |
122 | iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; | |
123 | iap->ia_mtime.tv_sec = tmp; | |
124 | iap->ia_mtime.tv_nsec = tmp1 * 1000; | |
125 | /* | |
126 | * Passing the invalid value useconds=1000000 for mtime | |
127 | * is a Sun convention for "set both mtime and atime to | |
128 | * current server time". It's needed to make permissions | |
129 | * checks for the "touch" program across v2 mounts to | |
130 | * Solaris and Irix boxes work correctly. See description of | |
131 | * sattr in section 6.1 of "NFS Illustrated" by | |
132 | * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5 | |
133 | */ | |
134 | if (tmp1 == 1000000) | |
135 | iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); | |
136 | } | |
137 | return p; | |
138 | } | |
139 | ||
140 | static __be32 * | |
141 | encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, | |
142 | struct kstat *stat) | |
143 | { | |
144 | struct dentry *dentry = fhp->fh_dentry; | |
145 | int type; | |
146 | struct timespec time; | |
147 | u32 f; | |
148 | ||
149 | type = (stat->mode & S_IFMT); | |
150 | ||
151 | *p++ = htonl(nfs_ftypes[type >> 12]); | |
152 | *p++ = htonl((u32) stat->mode); | |
153 | *p++ = htonl((u32) stat->nlink); | |
154 | *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid)); | |
155 | *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid)); | |
156 | ||
157 | if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) { | |
158 | *p++ = htonl(NFS_MAXPATHLEN); | |
159 | } else { | |
160 | *p++ = htonl((u32) stat->size); | |
161 | } | |
162 | *p++ = htonl((u32) stat->blksize); | |
163 | if (S_ISCHR(type) || S_ISBLK(type)) | |
164 | *p++ = htonl(new_encode_dev(stat->rdev)); | |
165 | else | |
166 | *p++ = htonl(0xffffffff); | |
167 | *p++ = htonl((u32) stat->blocks); | |
168 | switch (fsid_source(fhp)) { | |
169 | default: | |
170 | case FSIDSOURCE_DEV: | |
171 | *p++ = htonl(new_encode_dev(stat->dev)); | |
172 | break; | |
173 | case FSIDSOURCE_FSID: | |
174 | *p++ = htonl((u32) fhp->fh_export->ex_fsid); | |
175 | break; | |
176 | case FSIDSOURCE_UUID: | |
177 | f = ((u32*)fhp->fh_export->ex_uuid)[0]; | |
178 | f ^= ((u32*)fhp->fh_export->ex_uuid)[1]; | |
179 | f ^= ((u32*)fhp->fh_export->ex_uuid)[2]; | |
180 | f ^= ((u32*)fhp->fh_export->ex_uuid)[3]; | |
181 | *p++ = htonl(f); | |
182 | break; | |
183 | } | |
184 | *p++ = htonl((u32) stat->ino); | |
185 | *p++ = htonl((u32) stat->atime.tv_sec); | |
186 | *p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0); | |
187 | lease_get_mtime(dentry->d_inode, &time); | |
188 | *p++ = htonl((u32) time.tv_sec); | |
189 | *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); | |
190 | *p++ = htonl((u32) stat->ctime.tv_sec); | |
191 | *p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0); | |
192 | ||
193 | return p; | |
194 | } | |
195 | ||
196 | /* Helper function for NFSv2 ACL code */ | |
197 | __be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) | |
198 | { | |
199 | struct kstat stat; | |
200 | vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry, &stat); | |
201 | return encode_fattr(rqstp, p, fhp, &stat); | |
202 | } | |
203 | ||
204 | /* | |
205 | * XDR decode functions | |
206 | */ | |
207 | int | |
208 | nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) | |
209 | { | |
210 | return xdr_argsize_check(rqstp, p); | |
211 | } | |
212 | ||
213 | int | |
214 | nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args) | |
215 | { | |
216 | if (!(p = decode_fh(p, &args->fh))) | |
217 | return 0; | |
218 | return xdr_argsize_check(rqstp, p); | |
219 | } | |
220 | ||
221 | int | |
222 | nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p, | |
223 | struct nfsd_sattrargs *args) | |
224 | { | |
225 | p = decode_fh(p, &args->fh); | |
226 | if (!p) | |
227 | return 0; | |
228 | p = decode_sattr(p, &args->attrs); | |
229 | ||
230 | return xdr_argsize_check(rqstp, p); | |
231 | } | |
232 | ||
233 | int | |
234 | nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *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 | ||
244 | int | |
245 | nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *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_V2) | |
258 | len = NFSSVC_MAXBLKSIZE_V2; | |
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 | rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]); | |
267 | rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE; | |
268 | len -= rqstp->rq_vec[v].iov_len; | |
269 | v++; | |
270 | } | |
271 | args->vlen = v; | |
272 | return xdr_argsize_check(rqstp, p); | |
273 | } | |
274 | ||
275 | int | |
276 | nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p, | |
277 | struct nfsd_writeargs *args) | |
278 | { | |
279 | unsigned int len, hdr, dlen; | |
280 | int v; | |
281 | ||
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 | /* | |
290 | * The protocol specifies a maximum of 8192 bytes. | |
291 | */ | |
292 | if (len > NFSSVC_MAXBLKSIZE_V2) | |
293 | return 0; | |
294 | ||
295 | /* | |
296 | * Check to make sure that we got the right number of | |
297 | * bytes. | |
298 | */ | |
299 | hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; | |
300 | dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len | |
301 | - hdr; | |
302 | ||
303 | /* | |
304 | * Round the length of the data which was specified up to | |
305 | * the next multiple of XDR units and then compare that | |
306 | * against the length which was actually received. | |
307 | * Note that when RPCSEC/GSS (for example) is used, the | |
308 | * data buffer can be padded so dlen might be larger | |
309 | * than required. It must never be smaller. | |
310 | */ | |
311 | if (dlen < XDR_QUADLEN(len)*4) | |
312 | return 0; | |
313 | ||
314 | rqstp->rq_vec[0].iov_base = (void*)p; | |
315 | rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr; | |
316 | v = 0; | |
317 | while (len > rqstp->rq_vec[v].iov_len) { | |
318 | len -= rqstp->rq_vec[v].iov_len; | |
319 | v++; | |
320 | rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]); | |
321 | rqstp->rq_vec[v].iov_len = PAGE_SIZE; | |
322 | } | |
323 | rqstp->rq_vec[v].iov_len = len; | |
324 | args->vlen = v + 1; | |
325 | return 1; | |
326 | } | |
327 | ||
328 | int | |
329 | nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p, | |
330 | struct nfsd_createargs *args) | |
331 | { | |
332 | if ( !(p = decode_fh(p, &args->fh)) | |
333 | || !(p = decode_filename(p, &args->name, &args->len))) | |
334 | return 0; | |
335 | p = decode_sattr(p, &args->attrs); | |
336 | ||
337 | return xdr_argsize_check(rqstp, p); | |
338 | } | |
339 | ||
340 | int | |
341 | nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p, | |
342 | struct nfsd_renameargs *args) | |
343 | { | |
344 | if (!(p = decode_fh(p, &args->ffh)) | |
345 | || !(p = decode_filename(p, &args->fname, &args->flen)) | |
346 | || !(p = decode_fh(p, &args->tfh)) | |
347 | || !(p = decode_filename(p, &args->tname, &args->tlen))) | |
348 | return 0; | |
349 | ||
350 | return xdr_argsize_check(rqstp, p); | |
351 | } | |
352 | ||
353 | int | |
354 | nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args) | |
355 | { | |
356 | if (!(p = decode_fh(p, &args->fh))) | |
357 | return 0; | |
358 | args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); | |
359 | ||
360 | return xdr_argsize_check(rqstp, p); | |
361 | } | |
362 | ||
363 | int | |
364 | nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p, | |
365 | struct nfsd_linkargs *args) | |
366 | { | |
367 | if (!(p = decode_fh(p, &args->ffh)) | |
368 | || !(p = decode_fh(p, &args->tfh)) | |
369 | || !(p = decode_filename(p, &args->tname, &args->tlen))) | |
370 | return 0; | |
371 | ||
372 | return xdr_argsize_check(rqstp, p); | |
373 | } | |
374 | ||
375 | int | |
376 | nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p, | |
377 | struct nfsd_symlinkargs *args) | |
378 | { | |
379 | if ( !(p = decode_fh(p, &args->ffh)) | |
380 | || !(p = decode_filename(p, &args->fname, &args->flen)) | |
381 | || !(p = decode_pathname(p, &args->tname, &args->tlen))) | |
382 | return 0; | |
383 | p = decode_sattr(p, &args->attrs); | |
384 | ||
385 | return xdr_argsize_check(rqstp, p); | |
386 | } | |
387 | ||
388 | int | |
389 | nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p, | |
390 | struct nfsd_readdirargs *args) | |
391 | { | |
392 | if (!(p = decode_fh(p, &args->fh))) | |
393 | return 0; | |
394 | args->cookie = ntohl(*p++); | |
395 | args->count = ntohl(*p++); | |
396 | if (args->count > PAGE_SIZE) | |
397 | args->count = PAGE_SIZE; | |
398 | ||
399 | args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused++]); | |
400 | ||
401 | return xdr_argsize_check(rqstp, p); | |
402 | } | |
403 | ||
404 | /* | |
405 | * XDR encode functions | |
406 | */ | |
407 | int | |
408 | nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy) | |
409 | { | |
410 | return xdr_ressize_check(rqstp, p); | |
411 | } | |
412 | ||
413 | int | |
414 | nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p, | |
415 | struct nfsd_attrstat *resp) | |
416 | { | |
417 | p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
418 | return xdr_ressize_check(rqstp, p); | |
419 | } | |
420 | ||
421 | int | |
422 | nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p, | |
423 | struct nfsd_diropres *resp) | |
424 | { | |
425 | p = encode_fh(p, &resp->fh); | |
426 | p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
427 | return xdr_ressize_check(rqstp, p); | |
428 | } | |
429 | ||
430 | int | |
431 | nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p, | |
432 | struct nfsd_readlinkres *resp) | |
433 | { | |
434 | *p++ = htonl(resp->len); | |
435 | xdr_ressize_check(rqstp, p); | |
436 | rqstp->rq_res.page_len = resp->len; | |
437 | if (resp->len & 3) { | |
438 | /* need to pad the tail */ | |
439 | rqstp->rq_res.tail[0].iov_base = p; | |
440 | *p = 0; | |
441 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3); | |
442 | } | |
443 | return 1; | |
444 | } | |
445 | ||
446 | int | |
447 | nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p, | |
448 | struct nfsd_readres *resp) | |
449 | { | |
450 | p = encode_fattr(rqstp, p, &resp->fh, &resp->stat); | |
451 | *p++ = htonl(resp->count); | |
452 | xdr_ressize_check(rqstp, p); | |
453 | ||
454 | /* now update rqstp->rq_res to reflect data aswell */ | |
455 | rqstp->rq_res.page_len = resp->count; | |
456 | if (resp->count & 3) { | |
457 | /* need to pad the tail */ | |
458 | rqstp->rq_res.tail[0].iov_base = p; | |
459 | *p = 0; | |
460 | rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3); | |
461 | } | |
462 | return 1; | |
463 | } | |
464 | ||
465 | int | |
466 | nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p, | |
467 | struct nfsd_readdirres *resp) | |
468 | { | |
469 | xdr_ressize_check(rqstp, p); | |
470 | p = resp->buffer; | |
471 | *p++ = 0; /* no more entries */ | |
472 | *p++ = htonl((resp->common.err == nfserr_eof)); | |
473 | rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1; | |
474 | ||
475 | return 1; | |
476 | } | |
477 | ||
478 | int | |
479 | nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p, | |
480 | struct nfsd_statfsres *resp) | |
481 | { | |
482 | struct kstatfs *stat = &resp->stats; | |
483 | ||
484 | *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */ | |
485 | *p++ = htonl(stat->f_bsize); | |
486 | *p++ = htonl(stat->f_blocks); | |
487 | *p++ = htonl(stat->f_bfree); | |
488 | *p++ = htonl(stat->f_bavail); | |
489 | return xdr_ressize_check(rqstp, p); | |
490 | } | |
491 | ||
492 | int | |
493 | nfssvc_encode_entry(void *ccdv, const char *name, | |
494 | int namlen, loff_t offset, u64 ino, unsigned int d_type) | |
495 | { | |
496 | struct readdir_cd *ccd = ccdv; | |
497 | struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common); | |
498 | __be32 *p = cd->buffer; | |
499 | int buflen, slen; | |
500 | ||
501 | /* | |
502 | dprintk("nfsd: entry(%.*s off %ld ino %ld)\n", | |
503 | namlen, name, offset, ino); | |
504 | */ | |
505 | ||
506 | if (offset > ~((u32) 0)) { | |
507 | cd->common.err = nfserr_fbig; | |
508 | return -EINVAL; | |
509 | } | |
510 | if (cd->offset) | |
511 | *cd->offset = htonl(offset); | |
512 | if (namlen > NFS2_MAXNAMLEN) | |
513 | namlen = NFS2_MAXNAMLEN;/* truncate filename */ | |
514 | ||
515 | slen = XDR_QUADLEN(namlen); | |
516 | if ((buflen = cd->buflen - slen - 4) < 0) { | |
517 | cd->common.err = nfserr_toosmall; | |
518 | return -EINVAL; | |
519 | } | |
520 | if (ino > ~((u32) 0)) { | |
521 | cd->common.err = nfserr_fbig; | |
522 | return -EINVAL; | |
523 | } | |
524 | *p++ = xdr_one; /* mark entry present */ | |
525 | *p++ = htonl((u32) ino); /* file id */ | |
526 | p = xdr_encode_array(p, name, namlen);/* name length & name */ | |
527 | cd->offset = p; /* remember pointer */ | |
528 | *p++ = htonl(~0U); /* offset of next entry */ | |
529 | ||
530 | cd->buflen = buflen; | |
531 | cd->buffer = p; | |
532 | cd->common.err = nfs_ok; | |
533 | return 0; | |
534 | } | |
535 | ||
536 | /* | |
537 | * XDR release functions | |
538 | */ | |
539 | int | |
540 | nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p, | |
541 | struct nfsd_fhandle *resp) | |
542 | { | |
543 | fh_put(&resp->fh); | |
544 | return 1; | |
545 | } |