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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 "vfs.h"
8#include "xdr.h"
9#include "auth.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_XDR
12
13/*
14 * Mapping of S_IF* types to NFS file types
15 */
16static u32 nfs_ftypes[] = {
17 NFNON, NFCHR, NFCHR, NFBAD,
18 NFDIR, NFBAD, NFBLK, NFBAD,
19 NFREG, NFBAD, NFLNK, NFBAD,
20 NFSOCK, NFBAD, NFLNK, NFBAD,
21};
22
23
24/*
25 * XDR functions for basic NFS types
26 */
27static __be32 *
28decode_fh(__be32 *p, struct svc_fh *fhp)
29{
30 fh_init(fhp, NFS_FHSIZE);
31 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
32 fhp->fh_handle.fh_size = NFS_FHSIZE;
33
34 /* FIXME: Look up export pointer here and verify
35 * Sun Secure RPC if requested */
36 return p + (NFS_FHSIZE >> 2);
37}
38
39/* Helper function for NFSv2 ACL code */
40__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
41{
42 return decode_fh(p, fhp);
43}
44
45static __be32 *
46encode_fh(__be32 *p, struct svc_fh *fhp)
47{
48 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
49 return p + (NFS_FHSIZE>> 2);
50}
51
52/*
53 * Decode a file name and make sure that the path contains
54 * no slashes or null bytes.
55 */
56static __be32 *
57decode_filename(__be32 *p, char **namp, unsigned int *lenp)
58{
59 char *name;
60 unsigned int i;
61
62 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
63 for (i = 0, name = *namp; i < *lenp; i++, name++) {
64 if (*name == '\0' || *name == '/')
65 return NULL;
66 }
67 }
68
69 return p;
70}
71
72static __be32 *
73decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
74{
75 char *name;
76 unsigned int i;
77
78 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
79 for (i = 0, name = *namp; i < *lenp; i++, name++) {
80 if (*name == '\0')
81 return NULL;
82 }
83 }
84
85 return p;
86}
87
88static __be32 *
89decode_sattr(__be32 *p, struct iattr *iap)
90{
91 u32 tmp, tmp1;
92
93 iap->ia_valid = 0;
94
95 /* Sun client bug compatibility check: some sun clients seem to
96 * put 0xffff in the mode field when they mean 0xffffffff.
97 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
98 */
99 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
100 iap->ia_valid |= ATTR_MODE;
101 iap->ia_mode = tmp;
102 }
103 if ((tmp = ntohl(*p++)) != (u32)-1) {
104 iap->ia_uid = make_kuid(&init_user_ns, tmp);
105 if (uid_valid(iap->ia_uid))
106 iap->ia_valid |= ATTR_UID;
107 }
108 if ((tmp = ntohl(*p++)) != (u32)-1) {
109 iap->ia_gid = make_kgid(&init_user_ns, tmp);
110 if (gid_valid(iap->ia_gid))
111 iap->ia_valid |= ATTR_GID;
112 }
113 if ((tmp = ntohl(*p++)) != (u32)-1) {
114 iap->ia_valid |= ATTR_SIZE;
115 iap->ia_size = tmp;
116 }
117 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
118 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
119 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
120 iap->ia_atime.tv_sec = tmp;
121 iap->ia_atime.tv_nsec = tmp1 * 1000;
122 }
123 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
124 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
125 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
126 iap->ia_mtime.tv_sec = tmp;
127 iap->ia_mtime.tv_nsec = tmp1 * 1000;
128 /*
129 * Passing the invalid value useconds=1000000 for mtime
130 * is a Sun convention for "set both mtime and atime to
131 * current server time". It's needed to make permissions
132 * checks for the "touch" program across v2 mounts to
133 * Solaris and Irix boxes work correctly. See description of
134 * sattr in section 6.1 of "NFS Illustrated" by
135 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
136 */
137 if (tmp1 == 1000000)
138 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
139 }
140 return p;
141}
142
143static __be32 *
144encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
145 struct kstat *stat)
146{
147 struct dentry *dentry = fhp->fh_dentry;
148 int type;
149 struct timespec time;
150 u32 f;
151
152 type = (stat->mode & S_IFMT);
153
154 *p++ = htonl(nfs_ftypes[type >> 12]);
155 *p++ = htonl((u32) stat->mode);
156 *p++ = htonl((u32) stat->nlink);
157 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
158 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
159
160 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
161 *p++ = htonl(NFS_MAXPATHLEN);
162 } else {
163 *p++ = htonl((u32) stat->size);
164 }
165 *p++ = htonl((u32) stat->blksize);
166 if (S_ISCHR(type) || S_ISBLK(type))
167 *p++ = htonl(new_encode_dev(stat->rdev));
168 else
169 *p++ = htonl(0xffffffff);
170 *p++ = htonl((u32) stat->blocks);
171 switch (fsid_source(fhp)) {
172 default:
173 case FSIDSOURCE_DEV:
174 *p++ = htonl(new_encode_dev(stat->dev));
175 break;
176 case FSIDSOURCE_FSID:
177 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
178 break;
179 case FSIDSOURCE_UUID:
180 f = ((u32*)fhp->fh_export->ex_uuid)[0];
181 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
182 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
183 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
184 *p++ = htonl(f);
185 break;
186 }
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(d_inode(dentry), &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
199/* Helper function for NFSv2 ACL code */
200__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
201{
202 return encode_fattr(rqstp, p, fhp, stat);
203}
204
205/*
206 * XDR decode functions
207 */
208int
209nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
210{
211 return xdr_argsize_check(rqstp, p);
212}
213
214int
215nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
216{
217 p = decode_fh(p, &args->fh);
218 if (!p)
219 return 0;
220 return xdr_argsize_check(rqstp, p);
221}
222
223int
224nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
225 struct nfsd_sattrargs *args)
226{
227 p = decode_fh(p, &args->fh);
228 if (!p)
229 return 0;
230 p = decode_sattr(p, &args->attrs);
231
232 return xdr_argsize_check(rqstp, p);
233}
234
235int
236nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
237 struct nfsd_diropargs *args)
238{
239 if (!(p = decode_fh(p, &args->fh))
240 || !(p = decode_filename(p, &args->name, &args->len)))
241 return 0;
242
243 return xdr_argsize_check(rqstp, p);
244}
245
246int
247nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
248 struct nfsd_readargs *args)
249{
250 unsigned int len;
251 int v;
252 p = decode_fh(p, &args->fh);
253 if (!p)
254 return 0;
255
256 args->offset = ntohl(*p++);
257 len = args->count = ntohl(*p++);
258 p++; /* totalcount - unused */
259
260 len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
261
262 /* set up somewhere to store response.
263 * We take pages, put them on reslist and include in iovec
264 */
265 v=0;
266 while (len > 0) {
267 struct page *p = *(rqstp->rq_next_page++);
268
269 rqstp->rq_vec[v].iov_base = page_address(p);
270 rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
271 len -= rqstp->rq_vec[v].iov_len;
272 v++;
273 }
274 args->vlen = v;
275 return xdr_argsize_check(rqstp, p);
276}
277
278int
279nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
280 struct nfsd_writeargs *args)
281{
282 unsigned int len, hdr, dlen;
283 int v;
284
285 p = decode_fh(p, &args->fh);
286 if (!p)
287 return 0;
288
289 p++; /* beginoffset */
290 args->offset = ntohl(*p++); /* offset */
291 p++; /* totalcount */
292 len = args->len = ntohl(*p++);
293 /*
294 * The protocol specifies a maximum of 8192 bytes.
295 */
296 if (len > NFSSVC_MAXBLKSIZE_V2)
297 return 0;
298
299 /*
300 * Check to make sure that we got the right number of
301 * bytes.
302 */
303 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
304 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
305 - hdr;
306
307 /*
308 * Round the length of the data which was specified up to
309 * the next multiple of XDR units and then compare that
310 * against the length which was actually received.
311 * Note that when RPCSEC/GSS (for example) is used, the
312 * data buffer can be padded so dlen might be larger
313 * than required. It must never be smaller.
314 */
315 if (dlen < XDR_QUADLEN(len)*4)
316 return 0;
317
318 rqstp->rq_vec[0].iov_base = (void*)p;
319 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
320 v = 0;
321 while (len > rqstp->rq_vec[v].iov_len) {
322 len -= rqstp->rq_vec[v].iov_len;
323 v++;
324 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
325 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
326 }
327 rqstp->rq_vec[v].iov_len = len;
328 args->vlen = v + 1;
329 return 1;
330}
331
332int
333nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
334 struct nfsd_createargs *args)
335{
336 if ( !(p = decode_fh(p, &args->fh))
337 || !(p = decode_filename(p, &args->name, &args->len)))
338 return 0;
339 p = decode_sattr(p, &args->attrs);
340
341 return xdr_argsize_check(rqstp, p);
342}
343
344int
345nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
346 struct nfsd_renameargs *args)
347{
348 if (!(p = decode_fh(p, &args->ffh))
349 || !(p = decode_filename(p, &args->fname, &args->flen))
350 || !(p = decode_fh(p, &args->tfh))
351 || !(p = decode_filename(p, &args->tname, &args->tlen)))
352 return 0;
353
354 return xdr_argsize_check(rqstp, p);
355}
356
357int
358nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
359{
360 p = decode_fh(p, &args->fh);
361 if (!p)
362 return 0;
363 args->buffer = page_address(*(rqstp->rq_next_page++));
364
365 return xdr_argsize_check(rqstp, p);
366}
367
368int
369nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
370 struct nfsd_linkargs *args)
371{
372 if (!(p = decode_fh(p, &args->ffh))
373 || !(p = decode_fh(p, &args->tfh))
374 || !(p = decode_filename(p, &args->tname, &args->tlen)))
375 return 0;
376
377 return xdr_argsize_check(rqstp, p);
378}
379
380int
381nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
382 struct nfsd_symlinkargs *args)
383{
384 if ( !(p = decode_fh(p, &args->ffh))
385 || !(p = decode_filename(p, &args->fname, &args->flen))
386 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
387 return 0;
388 p = decode_sattr(p, &args->attrs);
389
390 return xdr_argsize_check(rqstp, p);
391}
392
393int
394nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
395 struct nfsd_readdirargs *args)
396{
397 p = decode_fh(p, &args->fh);
398 if (!p)
399 return 0;
400 args->cookie = ntohl(*p++);
401 args->count = ntohl(*p++);
402 args->count = min_t(u32, args->count, PAGE_SIZE);
403 args->buffer = page_address(*(rqstp->rq_next_page++));
404
405 return xdr_argsize_check(rqstp, p);
406}
407
408/*
409 * XDR encode functions
410 */
411int
412nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
413{
414 return xdr_ressize_check(rqstp, p);
415}
416
417int
418nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
419 struct nfsd_attrstat *resp)
420{
421 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
422 return xdr_ressize_check(rqstp, p);
423}
424
425int
426nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
427 struct nfsd_diropres *resp)
428{
429 p = encode_fh(p, &resp->fh);
430 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
431 return xdr_ressize_check(rqstp, p);
432}
433
434int
435nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
436 struct nfsd_readlinkres *resp)
437{
438 *p++ = htonl(resp->len);
439 xdr_ressize_check(rqstp, p);
440 rqstp->rq_res.page_len = resp->len;
441 if (resp->len & 3) {
442 /* need to pad the tail */
443 rqstp->rq_res.tail[0].iov_base = p;
444 *p = 0;
445 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
446 }
447 return 1;
448}
449
450int
451nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
452 struct nfsd_readres *resp)
453{
454 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
455 *p++ = htonl(resp->count);
456 xdr_ressize_check(rqstp, p);
457
458 /* now update rqstp->rq_res to reflect data as well */
459 rqstp->rq_res.page_len = resp->count;
460 if (resp->count & 3) {
461 /* need to pad the tail */
462 rqstp->rq_res.tail[0].iov_base = p;
463 *p = 0;
464 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
465 }
466 return 1;
467}
468
469int
470nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
471 struct nfsd_readdirres *resp)
472{
473 xdr_ressize_check(rqstp, p);
474 p = resp->buffer;
475 *p++ = 0; /* no more entries */
476 *p++ = htonl((resp->common.err == nfserr_eof));
477 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
478
479 return 1;
480}
481
482int
483nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
484 struct nfsd_statfsres *resp)
485{
486 struct kstatfs *stat = &resp->stats;
487
488 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
489 *p++ = htonl(stat->f_bsize);
490 *p++ = htonl(stat->f_blocks);
491 *p++ = htonl(stat->f_bfree);
492 *p++ = htonl(stat->f_bavail);
493 return xdr_ressize_check(rqstp, p);
494}
495
496int
497nfssvc_encode_entry(void *ccdv, const char *name,
498 int namlen, loff_t offset, u64 ino, unsigned int d_type)
499{
500 struct readdir_cd *ccd = ccdv;
501 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
502 __be32 *p = cd->buffer;
503 int buflen, slen;
504
505 /*
506 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
507 namlen, name, offset, ino);
508 */
509
510 if (offset > ~((u32) 0)) {
511 cd->common.err = nfserr_fbig;
512 return -EINVAL;
513 }
514 if (cd->offset)
515 *cd->offset = htonl(offset);
516
517 /* truncate filename */
518 namlen = min(namlen, NFS2_MAXNAMLEN);
519 slen = XDR_QUADLEN(namlen);
520
521 if ((buflen = cd->buflen - slen - 4) < 0) {
522 cd->common.err = nfserr_toosmall;
523 return -EINVAL;
524 }
525 if (ino > ~((u32) 0)) {
526 cd->common.err = nfserr_fbig;
527 return -EINVAL;
528 }
529 *p++ = xdr_one; /* mark entry present */
530 *p++ = htonl((u32) ino); /* file id */
531 p = xdr_encode_array(p, name, namlen);/* name length & name */
532 cd->offset = p; /* remember pointer */
533 *p++ = htonl(~0U); /* offset of next entry */
534
535 cd->buflen = buflen;
536 cd->buffer = p;
537 cd->common.err = nfs_ok;
538 return 0;
539}
540
541/*
542 * XDR release functions
543 */
544int
545nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
546 struct nfsd_fhandle *resp)
547{
548 fh_put(&resp->fh);
549 return 1;
550}
1/*
2 * XDR support for nfsd
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 */
6
7#include "vfs.h"
8#include "xdr.h"
9#include "auth.h"
10
11#define NFSDDBG_FACILITY NFSDDBG_XDR
12
13/*
14 * Mapping of S_IF* types to NFS file types
15 */
16static u32 nfs_ftypes[] = {
17 NFNON, NFCHR, NFCHR, NFBAD,
18 NFDIR, NFBAD, NFBLK, NFBAD,
19 NFREG, NFBAD, NFLNK, NFBAD,
20 NFSOCK, NFBAD, NFLNK, NFBAD,
21};
22
23
24/*
25 * XDR functions for basic NFS types
26 */
27static __be32 *
28decode_fh(__be32 *p, struct svc_fh *fhp)
29{
30 fh_init(fhp, NFS_FHSIZE);
31 memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
32 fhp->fh_handle.fh_size = NFS_FHSIZE;
33
34 /* FIXME: Look up export pointer here and verify
35 * Sun Secure RPC if requested */
36 return p + (NFS_FHSIZE >> 2);
37}
38
39/* Helper function for NFSv2 ACL code */
40__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
41{
42 return decode_fh(p, fhp);
43}
44
45static __be32 *
46encode_fh(__be32 *p, struct svc_fh *fhp)
47{
48 memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
49 return p + (NFS_FHSIZE>> 2);
50}
51
52/*
53 * Decode a file name and make sure that the path contains
54 * no slashes or null bytes.
55 */
56static __be32 *
57decode_filename(__be32 *p, char **namp, unsigned int *lenp)
58{
59 char *name;
60 unsigned int i;
61
62 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
63 for (i = 0, name = *namp; i < *lenp; i++, name++) {
64 if (*name == '\0' || *name == '/')
65 return NULL;
66 }
67 }
68
69 return p;
70}
71
72static __be32 *
73decode_pathname(__be32 *p, char **namp, unsigned int *lenp)
74{
75 char *name;
76 unsigned int i;
77
78 if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
79 for (i = 0, name = *namp; i < *lenp; i++, name++) {
80 if (*name == '\0')
81 return NULL;
82 }
83 }
84
85 return p;
86}
87
88static __be32 *
89decode_sattr(__be32 *p, struct iattr *iap)
90{
91 u32 tmp, tmp1;
92
93 iap->ia_valid = 0;
94
95 /* Sun client bug compatibility check: some sun clients seem to
96 * put 0xffff in the mode field when they mean 0xffffffff.
97 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
98 */
99 if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
100 iap->ia_valid |= ATTR_MODE;
101 iap->ia_mode = tmp;
102 }
103 if ((tmp = ntohl(*p++)) != (u32)-1) {
104 iap->ia_uid = make_kuid(&init_user_ns, tmp);
105 if (uid_valid(iap->ia_uid))
106 iap->ia_valid |= ATTR_UID;
107 }
108 if ((tmp = ntohl(*p++)) != (u32)-1) {
109 iap->ia_gid = make_kgid(&init_user_ns, tmp);
110 if (gid_valid(iap->ia_gid))
111 iap->ia_valid |= ATTR_GID;
112 }
113 if ((tmp = ntohl(*p++)) != (u32)-1) {
114 iap->ia_valid |= ATTR_SIZE;
115 iap->ia_size = tmp;
116 }
117 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
118 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
119 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
120 iap->ia_atime.tv_sec = tmp;
121 iap->ia_atime.tv_nsec = tmp1 * 1000;
122 }
123 tmp = ntohl(*p++); tmp1 = ntohl(*p++);
124 if (tmp != (u32)-1 && tmp1 != (u32)-1) {
125 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
126 iap->ia_mtime.tv_sec = tmp;
127 iap->ia_mtime.tv_nsec = tmp1 * 1000;
128 /*
129 * Passing the invalid value useconds=1000000 for mtime
130 * is a Sun convention for "set both mtime and atime to
131 * current server time". It's needed to make permissions
132 * checks for the "touch" program across v2 mounts to
133 * Solaris and Irix boxes work correctly. See description of
134 * sattr in section 6.1 of "NFS Illustrated" by
135 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
136 */
137 if (tmp1 == 1000000)
138 iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
139 }
140 return p;
141}
142
143static __be32 *
144encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
145 struct kstat *stat)
146{
147 struct dentry *dentry = fhp->fh_dentry;
148 int type;
149 struct timespec time;
150 u32 f;
151
152 type = (stat->mode & S_IFMT);
153
154 *p++ = htonl(nfs_ftypes[type >> 12]);
155 *p++ = htonl((u32) stat->mode);
156 *p++ = htonl((u32) stat->nlink);
157 *p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
158 *p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
159
160 if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
161 *p++ = htonl(NFS_MAXPATHLEN);
162 } else {
163 *p++ = htonl((u32) stat->size);
164 }
165 *p++ = htonl((u32) stat->blksize);
166 if (S_ISCHR(type) || S_ISBLK(type))
167 *p++ = htonl(new_encode_dev(stat->rdev));
168 else
169 *p++ = htonl(0xffffffff);
170 *p++ = htonl((u32) stat->blocks);
171 switch (fsid_source(fhp)) {
172 default:
173 case FSIDSOURCE_DEV:
174 *p++ = htonl(new_encode_dev(stat->dev));
175 break;
176 case FSIDSOURCE_FSID:
177 *p++ = htonl((u32) fhp->fh_export->ex_fsid);
178 break;
179 case FSIDSOURCE_UUID:
180 f = ((u32*)fhp->fh_export->ex_uuid)[0];
181 f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
182 f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
183 f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
184 *p++ = htonl(f);
185 break;
186 }
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
199/* Helper function for NFSv2 ACL code */
200__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
201{
202 return encode_fattr(rqstp, p, fhp, stat);
203}
204
205/*
206 * XDR decode functions
207 */
208int
209nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
210{
211 return xdr_argsize_check(rqstp, p);
212}
213
214int
215nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *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
222int
223nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
224 struct nfsd_sattrargs *args)
225{
226 p = decode_fh(p, &args->fh);
227 if (!p)
228 return 0;
229 p = decode_sattr(p, &args->attrs);
230
231 return xdr_argsize_check(rqstp, p);
232}
233
234int
235nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
236 struct nfsd_diropargs *args)
237{
238 if (!(p = decode_fh(p, &args->fh))
239 || !(p = decode_filename(p, &args->name, &args->len)))
240 return 0;
241
242 return xdr_argsize_check(rqstp, p);
243}
244
245int
246nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
247 struct nfsd_readargs *args)
248{
249 unsigned int len;
250 int v;
251 if (!(p = decode_fh(p, &args->fh)))
252 return 0;
253
254 args->offset = ntohl(*p++);
255 len = args->count = ntohl(*p++);
256 p++; /* totalcount - unused */
257
258 if (len > NFSSVC_MAXBLKSIZE_V2)
259 len = NFSSVC_MAXBLKSIZE_V2;
260
261 /* set up somewhere to store response.
262 * We take pages, put them on reslist and include in iovec
263 */
264 v=0;
265 while (len > 0) {
266 struct page *p = *(rqstp->rq_next_page++);
267
268 rqstp->rq_vec[v].iov_base = page_address(p);
269 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
270 len -= rqstp->rq_vec[v].iov_len;
271 v++;
272 }
273 args->vlen = v;
274 return xdr_argsize_check(rqstp, p);
275}
276
277int
278nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
279 struct nfsd_writeargs *args)
280{
281 unsigned int len, hdr, dlen;
282 int v;
283
284 if (!(p = decode_fh(p, &args->fh)))
285 return 0;
286
287 p++; /* beginoffset */
288 args->offset = ntohl(*p++); /* offset */
289 p++; /* totalcount */
290 len = args->len = ntohl(*p++);
291 /*
292 * The protocol specifies a maximum of 8192 bytes.
293 */
294 if (len > NFSSVC_MAXBLKSIZE_V2)
295 return 0;
296
297 /*
298 * Check to make sure that we got the right number of
299 * bytes.
300 */
301 hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
302 dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
303 - hdr;
304
305 /*
306 * Round the length of the data which was specified up to
307 * the next multiple of XDR units and then compare that
308 * against the length which was actually received.
309 * Note that when RPCSEC/GSS (for example) is used, the
310 * data buffer can be padded so dlen might be larger
311 * than required. It must never be smaller.
312 */
313 if (dlen < XDR_QUADLEN(len)*4)
314 return 0;
315
316 rqstp->rq_vec[0].iov_base = (void*)p;
317 rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
318 v = 0;
319 while (len > rqstp->rq_vec[v].iov_len) {
320 len -= rqstp->rq_vec[v].iov_len;
321 v++;
322 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
323 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
324 }
325 rqstp->rq_vec[v].iov_len = len;
326 args->vlen = v + 1;
327 return 1;
328}
329
330int
331nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
332 struct nfsd_createargs *args)
333{
334 if ( !(p = decode_fh(p, &args->fh))
335 || !(p = decode_filename(p, &args->name, &args->len)))
336 return 0;
337 p = decode_sattr(p, &args->attrs);
338
339 return xdr_argsize_check(rqstp, p);
340}
341
342int
343nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
344 struct nfsd_renameargs *args)
345{
346 if (!(p = decode_fh(p, &args->ffh))
347 || !(p = decode_filename(p, &args->fname, &args->flen))
348 || !(p = decode_fh(p, &args->tfh))
349 || !(p = decode_filename(p, &args->tname, &args->tlen)))
350 return 0;
351
352 return xdr_argsize_check(rqstp, p);
353}
354
355int
356nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd_readlinkargs *args)
357{
358 if (!(p = decode_fh(p, &args->fh)))
359 return 0;
360 args->buffer = page_address(*(rqstp->rq_next_page++));
361
362 return xdr_argsize_check(rqstp, p);
363}
364
365int
366nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
367 struct nfsd_linkargs *args)
368{
369 if (!(p = decode_fh(p, &args->ffh))
370 || !(p = decode_fh(p, &args->tfh))
371 || !(p = decode_filename(p, &args->tname, &args->tlen)))
372 return 0;
373
374 return xdr_argsize_check(rqstp, p);
375}
376
377int
378nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
379 struct nfsd_symlinkargs *args)
380{
381 if ( !(p = decode_fh(p, &args->ffh))
382 || !(p = decode_filename(p, &args->fname, &args->flen))
383 || !(p = decode_pathname(p, &args->tname, &args->tlen)))
384 return 0;
385 p = decode_sattr(p, &args->attrs);
386
387 return xdr_argsize_check(rqstp, p);
388}
389
390int
391nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
392 struct nfsd_readdirargs *args)
393{
394 if (!(p = decode_fh(p, &args->fh)))
395 return 0;
396 args->cookie = ntohl(*p++);
397 args->count = ntohl(*p++);
398 if (args->count > PAGE_SIZE)
399 args->count = PAGE_SIZE;
400
401 args->buffer = page_address(*(rqstp->rq_next_page++));
402
403 return xdr_argsize_check(rqstp, p);
404}
405
406/*
407 * XDR encode functions
408 */
409int
410nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
411{
412 return xdr_ressize_check(rqstp, p);
413}
414
415int
416nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
417 struct nfsd_attrstat *resp)
418{
419 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
420 return xdr_ressize_check(rqstp, p);
421}
422
423int
424nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
425 struct nfsd_diropres *resp)
426{
427 p = encode_fh(p, &resp->fh);
428 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
429 return xdr_ressize_check(rqstp, p);
430}
431
432int
433nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
434 struct nfsd_readlinkres *resp)
435{
436 *p++ = htonl(resp->len);
437 xdr_ressize_check(rqstp, p);
438 rqstp->rq_res.page_len = resp->len;
439 if (resp->len & 3) {
440 /* need to pad the tail */
441 rqstp->rq_res.tail[0].iov_base = p;
442 *p = 0;
443 rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
444 }
445 return 1;
446}
447
448int
449nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
450 struct nfsd_readres *resp)
451{
452 p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
453 *p++ = htonl(resp->count);
454 xdr_ressize_check(rqstp, p);
455
456 /* now update rqstp->rq_res to reflect data as well */
457 rqstp->rq_res.page_len = resp->count;
458 if (resp->count & 3) {
459 /* need to pad the tail */
460 rqstp->rq_res.tail[0].iov_base = p;
461 *p = 0;
462 rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
463 }
464 return 1;
465}
466
467int
468nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
469 struct nfsd_readdirres *resp)
470{
471 xdr_ressize_check(rqstp, p);
472 p = resp->buffer;
473 *p++ = 0; /* no more entries */
474 *p++ = htonl((resp->common.err == nfserr_eof));
475 rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
476
477 return 1;
478}
479
480int
481nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p,
482 struct nfsd_statfsres *resp)
483{
484 struct kstatfs *stat = &resp->stats;
485
486 *p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
487 *p++ = htonl(stat->f_bsize);
488 *p++ = htonl(stat->f_blocks);
489 *p++ = htonl(stat->f_bfree);
490 *p++ = htonl(stat->f_bavail);
491 return xdr_ressize_check(rqstp, p);
492}
493
494int
495nfssvc_encode_entry(void *ccdv, const char *name,
496 int namlen, loff_t offset, u64 ino, unsigned int d_type)
497{
498 struct readdir_cd *ccd = ccdv;
499 struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
500 __be32 *p = cd->buffer;
501 int buflen, slen;
502
503 /*
504 dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
505 namlen, name, offset, ino);
506 */
507
508 if (offset > ~((u32) 0)) {
509 cd->common.err = nfserr_fbig;
510 return -EINVAL;
511 }
512 if (cd->offset)
513 *cd->offset = htonl(offset);
514 if (namlen > NFS2_MAXNAMLEN)
515 namlen = NFS2_MAXNAMLEN;/* truncate filename */
516
517 slen = XDR_QUADLEN(namlen);
518 if ((buflen = cd->buflen - slen - 4) < 0) {
519 cd->common.err = nfserr_toosmall;
520 return -EINVAL;
521 }
522 if (ino > ~((u32) 0)) {
523 cd->common.err = nfserr_fbig;
524 return -EINVAL;
525 }
526 *p++ = xdr_one; /* mark entry present */
527 *p++ = htonl((u32) ino); /* file id */
528 p = xdr_encode_array(p, name, namlen);/* name length & name */
529 cd->offset = p; /* remember pointer */
530 *p++ = htonl(~0U); /* offset of next entry */
531
532 cd->buflen = buflen;
533 cd->buffer = p;
534 cd->common.err = nfs_ok;
535 return 0;
536}
537
538/*
539 * XDR release functions
540 */
541int
542nfssvc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
543 struct nfsd_fhandle *resp)
544{
545 fh_put(&resp->fh);
546 return 1;
547}