Commit | Line | Data |
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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 | ||
a257cdd0 AG |
52 | /* Helper function for NFSv2 ACL code */ |
53 | u32 *nfs2svc_decode_fh(u32 *p, struct svc_fh *fhp) | |
54 | { | |
55 | return decode_fh(p, fhp); | |
56 | } | |
57 | ||
1da177e4 LT |
58 | static inline u32 * |
59 | encode_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 | */ | |
69 | static inline u32 * | |
70 | decode_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 | ||
85 | static inline u32 * | |
86 | decode_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 | ||
101 | static inline u32 * | |
102 | decode_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 | ||
154 | static inline u32 * | |
155 | encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
156 | { | |
157 | struct vfsmount *mnt = fhp->fh_export->ex_mnt; | |
158 | struct dentry *dentry = fhp->fh_dentry; | |
159 | struct kstat stat; | |
160 | int type; | |
161 | struct timespec time; | |
162 | ||
163 | vfs_getattr(mnt, dentry, &stat); | |
164 | type = (stat.mode & S_IFMT); | |
165 | ||
166 | *p++ = htonl(nfs_ftypes[type >> 12]); | |
167 | *p++ = htonl((u32) stat.mode); | |
168 | *p++ = htonl((u32) stat.nlink); | |
169 | *p++ = htonl((u32) nfsd_ruid(rqstp, stat.uid)); | |
170 | *p++ = htonl((u32) nfsd_rgid(rqstp, stat.gid)); | |
171 | ||
172 | if (S_ISLNK(type) && stat.size > NFS_MAXPATHLEN) { | |
173 | *p++ = htonl(NFS_MAXPATHLEN); | |
174 | } else { | |
175 | *p++ = htonl((u32) stat.size); | |
176 | } | |
177 | *p++ = htonl((u32) stat.blksize); | |
178 | if (S_ISCHR(type) || S_ISBLK(type)) | |
179 | *p++ = htonl(new_encode_dev(stat.rdev)); | |
180 | else | |
181 | *p++ = htonl(0xffffffff); | |
182 | *p++ = htonl((u32) stat.blocks); | |
183 | if (is_fsid(fhp, rqstp->rq_reffh)) | |
184 | *p++ = htonl((u32) fhp->fh_export->ex_fsid); | |
185 | else | |
186 | *p++ = htonl(new_encode_dev(stat.dev)); | |
187 | *p++ = htonl((u32) stat.ino); | |
188 | *p++ = htonl((u32) stat.atime.tv_sec); | |
189 | *p++ = htonl(stat.atime.tv_nsec ? stat.atime.tv_nsec / 1000 : 0); | |
190 | lease_get_mtime(dentry->d_inode, &time); | |
191 | *p++ = htonl((u32) time.tv_sec); | |
192 | *p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); | |
193 | *p++ = htonl((u32) stat.ctime.tv_sec); | |
194 | *p++ = htonl(stat.ctime.tv_nsec ? stat.ctime.tv_nsec / 1000 : 0); | |
195 | ||
196 | return p; | |
197 | } | |
198 | ||
a257cdd0 AG |
199 | /* Helper function for NFSv2 ACL code */ |
200 | u32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) | |
201 | { | |
202 | return encode_fattr(rqstp, p, fhp); | |
203 | } | |
1da177e4 LT |
204 | |
205 | /* | |
206 | * XDR decode functions | |
207 | */ | |
208 | int | |
209 | nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) | |
210 | { | |
211 | return xdr_argsize_check(rqstp, p); | |
212 | } | |
213 | ||
214 | int | |
215 | nfssvc_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 | ||
222 | int | |
223 | nfssvc_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 | ||
233 | int | |
234 | nfssvc_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 | ||
244 | int | |
245 | nfssvc_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 | ||
276 | int | |
277 | nfssvc_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 | ||
306 | int | |
307 | nfssvc_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 | ||
318 | int | |
319 | nfssvc_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 | ||
331 | int | |
332 | nfssvc_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 | ||
342 | int | |
343 | nfssvc_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 | ||
354 | int | |
355 | nfssvc_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 | ||
367 | int | |
368 | nfssvc_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 | */ | |
387 | int | |
388 | nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy) | |
389 | { | |
390 | return xdr_ressize_check(rqstp, p); | |
391 | } | |
392 | ||
393 | int | |
394 | nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, | |
395 | struct nfsd_attrstat *resp) | |
396 | { | |
397 | p = encode_fattr(rqstp, p, &resp->fh); | |
398 | return xdr_ressize_check(rqstp, p); | |
399 | } | |
400 | ||
401 | int | |
402 | nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p, | |
403 | struct nfsd_diropres *resp) | |
404 | { | |
405 | p = encode_fh(p, &resp->fh); | |
406 | p = encode_fattr(rqstp, p, &resp->fh); | |
407 | return xdr_ressize_check(rqstp, p); | |
408 | } | |
409 | ||
410 | int | |
411 | nfssvc_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 | ||
427 | int | |
428 | nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p, | |
429 | struct nfsd_readres *resp) | |
430 | { | |
431 | p = encode_fattr(rqstp, p, &resp->fh); | |
432 | *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 | ||
447 | int | |
448 | nfssvc_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 | ||
460 | int | |
461 | nfssvc_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 | ||
474 | int | |
475 | nfssvc_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 | */ | |
516 | int | |
517 | nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p, | |
518 | struct nfsd_fhandle *resp) | |
519 | { | |
520 | fh_put(&resp->fh); | |
521 | return 1; | |
522 | } |