summaryrefslogtreecommitdiffstats
path: root/fs/lockd/xdr.c
blob: 5316e307a49d3a17156cbced0828558c37eb9cb7 (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
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
/*
 * linux/fs/lockd/xdr.c
 *
 * XDR support for lockd and the lock client.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/utsname.h>
#include <linux/nfs.h>

#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/stats.h>
#include <linux/lockd/lockd.h>
#include <linux/lockd/sm_inter.h>

#define NLMDBG_FACILITY		NLMDBG_XDR


static inline loff_t
s32_to_loff_t(__s32 offset)
{
	return (loff_t)offset;
}

static inline __s32
loff_t_to_s32(loff_t offset)
{
	__s32 res;
	if (offset >= NLM_OFFSET_MAX)
		res = NLM_OFFSET_MAX;
	else if (offset <= -NLM_OFFSET_MAX)
		res = -NLM_OFFSET_MAX;
	else
		res = offset;
	return res;
}

/*
 * XDR functions for basic NLM types
 */
static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
{
	unsigned int	len;

	len = ntohl(*p++);
	
	if(len==0)
	{
		c->len=4;
		memset(c->data, 0, 4);	/* hockeypux brain damage */
	}
	else if(len<=NLM_MAXCOOKIELEN)
	{
		c->len=len;
		memcpy(c->data, p, len);
		p+=XDR_QUADLEN(len);
	}
	else 
	{
		printk(KERN_NOTICE
			"lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
		return NULL;
	}
	return p;
}

static inline __be32 *
nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
{
	*p++ = htonl(c->len);
	memcpy(p, c->data, c->len);
	p+=XDR_QUADLEN(c->len);
	return p;
}

static __be32 *
nlm_decode_fh(__be32 *p, struct nfs_fh *f)
{
	unsigned int	len;

	if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
		printk(KERN_NOTICE
			"lockd: bad fhandle size %d (should be %d)\n",
			len, NFS2_FHSIZE);
		return NULL;
	}
	f->size = NFS2_FHSIZE;
	memset(f->data, 0, sizeof(f->data));
	memcpy(f->data, p, NFS2_FHSIZE);
	return p + XDR_QUADLEN(NFS2_FHSIZE);
}

static inline __be32 *
nlm_encode_fh(__be32 *p, struct nfs_fh *f)
{
	*p++ = htonl(NFS2_FHSIZE);
	memcpy(p, f->data, NFS2_FHSIZE);
	return p + XDR_QUADLEN(NFS2_FHSIZE);
}

/*
 * Encode and decode owner handle
 */
static inline __be32 *
nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
{
	return xdr_decode_netobj(p, oh);
}

static inline __be32 *
nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
{
	return xdr_encode_netobj(p, oh);
}

static __be32 *
nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
{
	struct file_lock	*fl = &lock->fl;
	s32			start, len, end;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len,
					    NLM_MAXSTRLEN))
	 || !(p = nlm_decode_fh(p, &lock->fh))
	 || !(p = nlm_decode_oh(p, &lock->oh)))
		return NULL;
	lock->svid  = ntohl(*p++);

	locks_init_lock(fl);
	fl->fl_owner = current->files;
	fl->fl_pid   = (pid_t)lock->svid;
	fl->fl_flags = FL_POSIX;
	fl->fl_type  = F_RDLCK;		/* as good as anything else */
	start = ntohl(*p++);
	len = ntohl(*p++);
	end = start + len - 1;

	fl->fl_start = s32_to_loff_t(start);

	if (len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = s32_to_loff_t(end);
	return p;
}

/*
 * Encode a lock as part of an NLM call
 */
static __be32 *
nlm_encode_lock(__be32 *p, struct nlm_lock *lock)
{
	struct file_lock	*fl = &lock->fl;
	__s32			start, len;

	if (!(p = xdr_encode_string(p, lock->caller))
	 || !(p = nlm_encode_fh(p, &lock->fh))
	 || !(p = nlm_encode_oh(p, &lock->oh)))
		return NULL;

	if (fl->fl_start > NLM_OFFSET_MAX
	 || (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
		return NULL;

	start = loff_t_to_s32(fl->fl_start);
	if (fl->fl_end == OFFSET_MAX)
		len = 0;
	else
		len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);

	*p++ = htonl(lock->svid);
	*p++ = htonl(start);
	*p++ = htonl(len);

	return p;
}

/*
 * Encode result of a TEST/TEST_MSG call
 */
static __be32 *
nlm_encode_testres(__be32 *p, struct nlm_res *resp)
{
	s32		start, len;

	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return NULL;
	*p++ = resp->status;

	if (resp->status == nlm_lck_denied) {
		struct file_lock	*fl = &resp->lock.fl;

		*p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
		*p++ = htonl(resp->lock.svid);

		/* Encode owner handle. */
		if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
			return NULL;

		start = loff_t_to_s32(fl->fl_start);
		if (fl->fl_end == OFFSET_MAX)
			len = 0;
		else
			len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);

		*p++ = htonl(start);
		*p++ = htonl(len);
	}

	return p;
}


/*
 * First, the server side XDR functions
 */
int
nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;

	exclusive = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;

	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_testres(p, resp)))
		return 0;
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block  = ntohl(*p++);
	exclusive    = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	argp->reclaim = ntohl(*p++);
	argp->state   = ntohl(*p++);
	argp->monitor = 1;		/* monitor client by default */

	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	u32	exclusive;

	if (!(p = nlm_decode_cookie(p, &argp->cookie)))
		return 0;
	argp->block = ntohl(*p++);
	exclusive = ntohl(*p++);
	if (!(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	 || !(p = nlm_decode_lock(p, &argp->lock)))
		return 0;
	argp->lock.fl.fl_type = F_UNLCK;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	memset(lock, 0, sizeof(*lock));
	locks_init_lock(&lock->fl);
	lock->svid = ~(u32) 0;
	lock->fl.fl_pid = (pid_t)lock->svid;

	if (!(p = nlm_decode_cookie(p, &argp->cookie))
	 || !(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN))
	 || !(p = nlm_decode_fh(p, &lock->fh))
	 || !(p = nlm_decode_oh(p, &lock->oh)))
		return 0;
	argp->fsm_mode = ntohl(*p++);
	argp->fsm_access = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	*p++ = xdr_zero;		/* sequence argument */
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return 0;
	*p++ = resp->status;
	return xdr_ressize_check(rqstp, p);
}

int
nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = xdr_decode_string_inplace(p, &lock->caller,
					    &lock->len, NLM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
{
	if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
		return 0;
	argp->state = ntohl(*p++);
	/* Preserve the address in network byte order */
	argp->addr = *p++;
	argp->vers = *p++;
	argp->proto = *p++;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
		return 0;
	resp->status = *p++;
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_argsize_check(rqstp, p);
}

int
nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
{
	return xdr_ressize_check(rqstp, p);
}

/*
 * Now, the client side XDR functions
 */
#ifdef NLMCLNT_SUPPORT_SHARES
static int
nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
{
	return 0;
}
#endif

static int
nlmclt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = nlm_encode_cookie(p, &argp->cookie)))
		return -EIO;
	*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
	if (!(p = nlm_encode_lock(p, lock)))
		return -EIO;
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
		return -EIO;
	resp->status = *p++;
	if (resp->status == nlm_lck_denied) {
		struct file_lock	*fl = &resp->lock.fl;
		u32			excl;
		s32			start, len, end;

		memset(&resp->lock, 0, sizeof(resp->lock));
		locks_init_lock(fl);
		excl = ntohl(*p++);
		resp->lock.svid = ntohl(*p++);
		fl->fl_pid = (pid_t)resp->lock.svid;
		if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
			return -EIO;

		fl->fl_flags = FL_POSIX;
		fl->fl_type  = excl? F_WRLCK : F_RDLCK;
		start = ntohl(*p++);
		len = ntohl(*p++);
		end = start + len - 1;

		fl->fl_start = s32_to_loff_t(start);
		if (len == 0 || end < 0)
			fl->fl_end = OFFSET_MAX;
		else
			fl->fl_end = s32_to_loff_t(end);
	}
	return 0;
}


static int
nlmclt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = nlm_encode_cookie(p, &argp->cookie)))
		return -EIO;
	*p++ = argp->block? xdr_one : xdr_zero;
	*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
	if (!(p = nlm_encode_lock(p, lock)))
		return -EIO;
	*p++ = argp->reclaim? xdr_one : xdr_zero;
	*p++ = htonl(argp->state);
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = nlm_encode_cookie(p, &argp->cookie)))
		return -EIO;
	*p++ = argp->block? xdr_one : xdr_zero;
	*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
	if (!(p = nlm_encode_lock(p, lock)))
		return -EIO;
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
{
	struct nlm_lock	*lock = &argp->lock;

	if (!(p = nlm_encode_cookie(p, &argp->cookie)))
		return -EIO;
	if (!(p = nlm_encode_lock(p, lock)))
		return -EIO;
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_cookie(p, &resp->cookie)))
		return -EIO;
	*p++ = resp->status;
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_encode_testres(p, resp)))
		return -EIO;
	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
	return 0;
}

static int
nlmclt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
{
	if (!(p = nlm_decode_cookie(p, &resp->cookie)))
		return -EIO;
	resp->status = *p++;
	return 0;
}

#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
#  error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
#endif

/*
 * Buffer requirements for NLM
 */
#define NLM_void_sz		0
#define NLM_cookie_sz		1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
#define NLM_caller_sz		1+XDR_QUADLEN(NLMCLNT_OHSIZE)
#define NLM_owner_sz		1+XDR_QUADLEN(NLMCLNT_OHSIZE)
#define NLM_fhandle_sz		1+XDR_QUADLEN(NFS2_FHSIZE)
#define NLM_lock_sz		3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz
#define NLM_holder_sz		4+NLM_owner_sz

#define NLM_testargs_sz		NLM_cookie_sz+1+NLM_lock_sz
#define NLM_lockargs_sz		NLM_cookie_sz+4+NLM_lock_sz
#define NLM_cancargs_sz		NLM_cookie_sz+2+NLM_lock_sz
#define NLM_unlockargs_sz	NLM_cookie_sz+NLM_lock_sz

#define NLM_testres_sz		NLM_cookie_sz+1+NLM_holder_sz
#define NLM_res_sz		NLM_cookie_sz+1
#define NLM_norep_sz		0

/*
 * For NLM, a void procedure really returns nothing
 */
#define nlmclt_decode_norep	NULL

#define PROC(proc, argtype, restype)	\
[NLMPROC_##proc] = {							\
	.p_proc      = NLMPROC_##proc,					\
	.p_encode    = (kxdrproc_t) nlmclt_encode_##argtype,		\
	.p_decode    = (kxdrproc_t) nlmclt_decode_##restype,		\
	.p_arglen    = NLM_##argtype##_sz,				\
	.p_replen    = NLM_##restype##_sz,				\
	.p_statidx   = NLMPROC_##proc,					\
	.p_name      = #proc,						\
	}

static struct rpc_procinfo	nlm_procedures[] = {
    PROC(TEST,		testargs,	testres),
    PROC(LOCK,		lockargs,	res),
    PROC(CANCEL,	cancargs,	res),
    PROC(UNLOCK,	unlockargs,	res),
    PROC(GRANTED,	testargs,	res),
    PROC(TEST_MSG,	testargs,	norep),
    PROC(LOCK_MSG,	lockargs,	norep),
    PROC(CANCEL_MSG,	cancargs,	norep),
    PROC(UNLOCK_MSG,	unlockargs,	norep),
    PROC(GRANTED_MSG,	testargs,	norep),
    PROC(TEST_RES,	testres,	norep),
    PROC(LOCK_RES,	res,		norep),
    PROC(CANCEL_RES,	res,		norep),
    PROC(UNLOCK_RES,	res,		norep),
    PROC(GRANTED_RES,	res,		norep),
#ifdef NLMCLNT_SUPPORT_SHARES
    PROC(SHARE,		shareargs,	shareres),
    PROC(UNSHARE,	shareargs,	shareres),
    PROC(NM_LOCK,	lockargs,	res),
    PROC(FREE_ALL,	notify,		void),
#endif
};

static struct rpc_version	nlm_version1 = {
		.number		= 1,
		.nrprocs	= 16,
		.procs		= nlm_procedures,
};

static struct rpc_version	nlm_version3 = {
		.number		= 3,
		.nrprocs	= 24,
		.procs		= nlm_procedures,
};

static struct rpc_version *	nlm_versions[] = {
	[1] = &nlm_version1,
	[3] = &nlm_version3,
#ifdef 	CONFIG_LOCKD_V4
	[4] = &nlm_version4,
#endif
};

static struct rpc_stat		nlm_stats;

struct rpc_program		nlm_program = {
		.name		= "lockd",
		.number		= NLM_PROGRAM,
		.nrvers		= ARRAY_SIZE(nlm_versions),
		.version	= nlm_versions,
		.stats		= &nlm_stats,
};

#ifdef RPC_DEBUG
const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
{
	/*
	 * We can get away with a static buffer because we're only
	 * called with BKL held.
	 */
	static char buf[2*NLM_MAXCOOKIELEN+1];
	int i;
	int len = sizeof(buf);
	char *p = buf;

	len--;	/* allow for trailing \0 */
	if (len < 3)
		return "???";
	for (i = 0 ; i < cookie->len ; i++) {
		if (len < 2) {
			strcpy(p-3, "...");
			break;
		}
		sprintf(p, "%02x", cookie->data[i]);
		p += 2;
		len -= 2;
	}
	*p = '\0';

	return buf;
}
#endif