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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 | } |
546 |
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jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9