aboutsummaryrefslogtreecommitdiff
path: root/fs/nfsd/nfsxdr.c
blob: 3f14a17eaa6ece85bcfe24300a21628f4353dbc6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
/*
 * linux/fs/nfsd/nfsxdr.c
 *
 * XDR support for nfsd
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/time.h>
#include <linux/nfs.h>
#include <linux/vfs.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/xdr.h>
#include <linux/mm.h>

#define NFSDDBG_FACILITY		NFSDDBG_XDR


#ifdef NFSD_OPTIMIZE_SPACE
# define inline
#endif

/*
 * Mapping of S_IF* types to NFS file types
 */
static u32	nfs_ftypes[] = {
	NFNON,  NFCHR,  NFCHR, NFBAD,
	NFDIR,  NFBAD,  NFBLK, NFBAD,
	NFREG,  NFBAD,  NFLNK, NFBAD,
	NFSOCK, NFBAD,  NFLNK, NFBAD,
};


/*
 * XDR functions for basic NFS types
 */
static u32 *
decode_fh(u32 *p, struct svc_fh *fhp)
{
	fh_init(fhp, NFS_FHSIZE);
	memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
	fhp->fh_handle.fh_size = NFS_FHSIZE;

	/* FIXME: Look up export pointer here and verify
	 * Sun Secure RPC if requested */
	return p + (NFS_FHSIZE >> 2);
}

/* Helper function for NFSv2 ACL code */
u32 *nfs2svc_decode_fh(u32 *p, struct svc_fh *fhp)
{
	return decode_fh(p, fhp);
}

static inline u32 *
encode_fh(u32 *p, struct svc_fh *fhp)
{
	memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
	return p + (NFS_FHSIZE>> 2);
}

/*
 * Decode a file name and make sure that the path contains
 * no slashes or null bytes.
 */
static inline u32 *
decode_filename(u32 *p, char **namp, int *lenp)
{
	char		*name;
	int		i;

	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
		for (i = 0, name = *namp; i < *lenp; i++, name++) {
			if (*name == '\0' || *name == '/')
				return NULL;
		}
	}

	return p;
}

static inline u32 *
decode_pathname(u32 *p, char **namp, int *lenp)
{
	char		*name;
	int		i;

	if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXPATHLEN)) != NULL) {
		for (i = 0, name = *namp; i < *lenp; i++, name++) {
			if (*name == '\0')
				return NULL;
		}
	}

	return p;
}

static inline u32 *
decode_sattr(u32 *p, struct iattr *iap)
{
	u32	tmp, tmp1;

	iap->ia_valid = 0;

	/* Sun client bug compatibility check: some sun clients seem to
	 * put 0xffff in the mode field when they mean 0xffffffff.
	 * Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
	 */
	if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = tmp;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_valid |= ATTR_UID;
		iap->ia_uid = tmp;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_valid |= ATTR_GID;
		iap->ia_gid = tmp;
	}
	if ((tmp = ntohl(*p++)) != (u32)-1) {
		iap->ia_valid |= ATTR_SIZE;
		iap->ia_size = tmp;
	}
	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
		iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
		iap->ia_atime.tv_sec = tmp;
		iap->ia_atime.tv_nsec = tmp1 * 1000; 
	}
	tmp  = ntohl(*p++); tmp1 = ntohl(*p++);
	if (tmp != (u32)-1 && tmp1 != (u32)-1) {
		iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
		iap->ia_mtime.tv_sec = tmp;
		iap->ia_mtime.tv_nsec = tmp1 * 1000; 
		/*
		 * Passing the invalid value useconds=1000000 for mtime
		 * is a Sun convention for "set both mtime and atime to
		 * current server time".  It's needed to make permissions
		 * checks for the "touch" program across v2 mounts to
		 * Solaris and Irix boxes work correctly. See description of
		 * sattr in section 6.1 of "NFS Illustrated" by
		 * Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
		 */
		if (tmp1 == 1000000)
			iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
	}
	return p;
}

static u32 *
encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp,
	     struct kstat *stat)
{
	struct dentry	*dentry = fhp->fh_dentry;
	int type;
	struct timespec time;

	type = (stat->mode & S_IFMT);

	*p++ = htonl(nfs_ftypes[type >> 12]);
	*p++ = htonl((u32) stat->mode);
	*p++ = htonl((u32) stat->nlink);
	*p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
	*p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));

	if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
		*p++ = htonl(NFS_MAXPATHLEN);
	} else {
		*p++ = htonl((u32) stat->size);
	}
	*p++ = htonl((u32) stat->blksize);
	if (S_ISCHR(type) || S_ISBLK(type))
		*p++ = htonl(new_encode_dev(stat->rdev));
	else
		*p++ = htonl(0xffffffff);
	*p++ = htonl((u32) stat->blocks);
	if (is_fsid(fhp, rqstp->rq_reffh))
		*p++ = htonl((u32) fhp->fh_export->ex_fsid);
	else
		*p++ = htonl(new_encode_dev(stat->dev));
	*p++ = htonl((u32) stat->ino);
	*p++ = htonl((u32) stat->atime.tv_sec);
	*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
	lease_get_mtime(dentry->d_inode, &time); 
	*p++ = htonl((u32) time.tv_sec);
	*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0); 
	*p++ = htonl((u32) stat->ctime.tv_sec);
	*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);

	return p;
}

/* Helper function for NFSv2 ACL code */
u32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp)
{
	struct kstat stat;
	vfs_getattr(fhp->fh_export->ex_mnt, fhp->fh_dentry, &stat);
	return encode_fattr(rqstp, p, fhp, &stat);
}

/*
 * XDR decode functions
 */
int
nfssvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd_fhandle *args)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_sattrargs *args)
{
	if (!(p = decode_fh(p, &args->fh))
	 || !(p = decode_sattr(p, &args->attrs)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_diropargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_diropargs *args)
{
	if (!(p = decode_fh(p, &args->fh))
	 || !(p = decode_filename(p, &args->name, &args->len)))
		return 0;

	 return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_readargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_readargs *args)
{
	unsigned int len;
	int v,pn;
	if (!(p = decode_fh(p, &args->fh)))
		return 0;

	args->offset    = ntohl(*p++);
	len = args->count     = ntohl(*p++);
	p++; /* totalcount - unused */

	if (len > NFSSVC_MAXBLKSIZE)
		len = NFSSVC_MAXBLKSIZE;

	/* set up somewhere to store response.
	 * We take pages, put them on reslist and include in iovec
	 */
	v=0;
	while (len > 0) {
		pn=rqstp->rq_resused;
		svc_take_page(rqstp);
		args->vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
		args->vec[v].iov_len = len < PAGE_SIZE?len:PAGE_SIZE;
		len -= args->vec[v].iov_len;
		v++;
	}
	args->vlen = v;
	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_writeargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_writeargs *args)
{
	unsigned int len;
	int v;
	if (!(p = decode_fh(p, &args->fh)))
		return 0;

	p++;				/* beginoffset */
	args->offset = ntohl(*p++);	/* offset */
	p++;				/* totalcount */
	len = args->len = ntohl(*p++);
	args->vec[0].iov_base = (void*)p;
	args->vec[0].iov_len = rqstp->rq_arg.head[0].iov_len -
				(((void*)p) - rqstp->rq_arg.head[0].iov_base);
	if (len > NFSSVC_MAXBLKSIZE)
		len = NFSSVC_MAXBLKSIZE;
	v = 0;
	while (len > args->vec[v].iov_len) {
		len -= args->vec[v].iov_len;
		v++;
		args->vec[v].iov_base = page_address(rqstp->rq_argpages[v]);
		args->vec[v].iov_len = PAGE_SIZE;
	}
	args->vec[v].iov_len = len;
	args->vlen = v+1;
	return args->vec[0].iov_len > 0;
}

int
nfssvc_decode_createargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_createargs *args)
{
	if (!(p = decode_fh(p, &args->fh))
	 || !(p = decode_filename(p, &args->name, &args->len))
	 || !(p = decode_sattr(p, &args->attrs)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_renameargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_renameargs *args)
{
	if (!(p = decode_fh(p, &args->ffh))
	 || !(p = decode_filename(p, &args->fname, &args->flen))
	 || !(p = decode_fh(p, &args->tfh))
	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd_readlinkargs *args)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	svc_take_page(rqstp);
	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_linkargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_linkargs *args)
{
	if (!(p = decode_fh(p, &args->ffh))
	 || !(p = decode_fh(p, &args->tfh))
	 || !(p = decode_filename(p, &args->tname, &args->tlen)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_symlinkargs *args)
{
	if (!(p = decode_fh(p, &args->ffh))
	 || !(p = decode_filename(p, &args->fname, &args->flen))
	 || !(p = decode_pathname(p, &args->tname, &args->tlen))
	 || !(p = decode_sattr(p, &args->attrs)))
		return 0;

	return xdr_argsize_check(rqstp, p);
}

int
nfssvc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_readdirargs *args)
{
	if (!(p = decode_fh(p, &args->fh)))
		return 0;
	args->cookie = ntohl(*p++);
	args->count  = ntohl(*p++);
	if (args->count > PAGE_SIZE)
		args->count = PAGE_SIZE;

	svc_take_page(rqstp);
	args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);

	return xdr_argsize_check(rqstp, p);
}

/*
 * XDR encode functions
 */
int
nfssvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_attrstat(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_attrstat *resp)
{
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_diropres(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_diropres *resp)
{
	p = encode_fh(p, &resp->fh);
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_readlinkres *resp)
{
	*p++ = htonl(resp->len);
	xdr_ressize_check(rqstp, p);
	rqstp->rq_res.page_len = resp->len;
	if (resp->len & 3) {
		/* need to pad the tail */
		rqstp->rq_restailpage = 0;
		rqstp->rq_res.tail[0].iov_base = p;
		*p = 0;
		rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
	}
	return 1;
}

int
nfssvc_encode_readres(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_readres *resp)
{
	p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
	*p++ = htonl(resp->count);
	xdr_ressize_check(rqstp, p);

	/* now update rqstp->rq_res to reflect data aswell */
	rqstp->rq_res.page_len = resp->count;
	if (resp->count & 3) {
		/* need to pad the tail */
		rqstp->rq_restailpage = 0;
		rqstp->rq_res.tail[0].iov_base = p;
		*p = 0;
		rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
	}
	return 1;
}

int
nfssvc_encode_readdirres(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_readdirres *resp)
{
	xdr_ressize_check(rqstp, p);
	p = resp->buffer;
	*p++ = 0;			/* no more entries */
	*p++ = htonl((resp->common.err == nfserr_eof));
	rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;

	return 1;
}

int
nfssvc_encode_statfsres(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_statfsres *resp)
{
	struct kstatfs	*stat = &resp->stats;

	*p++ = htonl(NFSSVC_MAXBLKSIZE);	/* max transfer size */
	*p++ = htonl(stat->f_bsize);
	*p++ = htonl(stat->f_blocks);
	*p++ = htonl(stat->f_bfree);
	*p++ = htonl(stat->f_bavail);
	return xdr_ressize_check(rqstp, p);
}

int
nfssvc_encode_entry(struct readdir_cd *ccd, const char *name,
		    int namlen, loff_t offset, ino_t ino, unsigned int d_type)
{
	struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
	u32	*p = cd->buffer;
	int	buflen, slen;

	/*
	dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
			namlen, name, offset, ino);
	 */

	if (offset > ~((u32) 0)) {
		cd->common.err = nfserr_fbig;
		return -EINVAL;
	}
	if (cd->offset)
		*cd->offset = htonl(offset);
	if (namlen > NFS2_MAXNAMLEN)
		namlen = NFS2_MAXNAMLEN;/* truncate filename */

	slen = XDR_QUADLEN(namlen);
	if ((buflen = cd->buflen - slen - 4) < 0) {
		cd->common.err = nfserr_toosmall;
		return -EINVAL;
	}
	*p++ = xdr_one;				/* mark entry present */
	*p++ = htonl((u32) ino);		/* file id */
	p    = xdr_encode_array(p, name, namlen);/* name length & name */
	cd->offset = p;			/* remember pointer */
	*p++ = ~(u32) 0;		/* offset of next entry */

	cd->buflen = buflen;
	cd->buffer = p;
	cd->common.err = nfs_ok;
	return 0;
}

/*
 * XDR release functions
 */
int
nfssvc_release_fhandle(struct svc_rqst *rqstp, u32 *p,
					struct nfsd_fhandle *resp)
{
	fh_put(&resp->fh);
	return 1;
}