summaryrefslogtreecommitdiffstats
path: root/fs/lockd/xdr4.c
blob: 45551dee26b41e3bb6b6086573bce3a51af562b9 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/lockd/xdr4.c
 *
 * XDR support for lockd and the lock client.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
 */

#include <linux/types.h>
#include <linux/sched.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 "svcxdr.h"

static inline loff_t
s64_to_loff_t(__s64 offset)
{
	return (loff_t)offset;
}


static inline s64
loff_t_to_s64(loff_t offset)
{
	s64 res;
	if (offset > NLM4_OFFSET_MAX)
		res = NLM4_OFFSET_MAX;
	else if (offset < -NLM4_OFFSET_MAX)
		res = -NLM4_OFFSET_MAX;
	else
		res = offset;
	return res;
}

/*
 * NLM file handles are defined by specification to be a variable-length
 * XDR opaque no longer than 1024 bytes. However, this implementation
 * limits their length to the size of an NFSv3 file handle.
 */
static bool
svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
{
	__be32 *p;
	u32 len;

	if (xdr_stream_decode_u32(xdr, &len) < 0)
		return false;
	if (len > NFS_MAXFHSIZE)
		return false;

	p = xdr_inline_decode(xdr, len);
	if (!p)
		return false;
	fh->size = len;
	memcpy(fh->data, p, len);
	memset(fh->data + len, 0, sizeof(fh->data) - len);

	return true;
}

static bool
svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
{
	struct file_lock *fl = &lock->fl;
	u64 len, start;
	s64 end;

	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
		return false;
	if (!svcxdr_decode_fhandle(xdr, &lock->fh))
		return false;
	if (!svcxdr_decode_owner(xdr, &lock->oh))
		return false;
	if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
		return false;
	if (xdr_stream_decode_u64(xdr, &start) < 0)
		return false;
	if (xdr_stream_decode_u64(xdr, &len) < 0)
		return false;

	locks_init_lock(fl);
	fl->fl_flags = FL_POSIX;
	fl->fl_type  = F_RDLCK;
	end = start + len - 1;
	fl->fl_start = s64_to_loff_t(start);
	if (len == 0 || end < 0)
		fl->fl_end = OFFSET_MAX;
	else
		fl->fl_end = s64_to_loff_t(end);

	return true;
}

static bool
svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
{
	const struct file_lock *fl = &lock->fl;
	s64 start, len;

	/* exclusive */
	if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
		return false;
	if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
		return false;
	if (!svcxdr_encode_owner(xdr, &lock->oh))
		return false;
	start = loff_t_to_s64(fl->fl_start);
	if (fl->fl_end == OFFSET_MAX)
		len = 0;
	else
		len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
	if (xdr_stream_encode_u64(xdr, start) < 0)
		return false;
	if (xdr_stream_encode_u64(xdr, len) < 0)
		return false;

	return true;
}

static bool
svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
{
	if (!svcxdr_encode_stats(xdr, resp->status))
		return false;
	switch (resp->status) {
	case nlm_lck_denied:
		if (!svcxdr_encode_holder(xdr, &resp->lock))
			return false;
	}

	return true;
}


/*
 * Decode Call arguments
 */

bool
nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	return true;
}

bool
nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;
	u32 exclusive;

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
		return false;
	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
		return false;
	if (!svcxdr_decode_lock(xdr, &argp->lock))
		return false;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;

	return true;
}

bool
nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;
	u32 exclusive;

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
		return false;
	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
		return false;
	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
		return false;
	if (!svcxdr_decode_lock(xdr, &argp->lock))
		return false;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;
	if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
		return false;
	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
		return false;
	argp->monitor = 1;		/* monitor client by default */

	return true;
}

bool
nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;
	u32 exclusive;

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
		return false;
	if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
		return false;
	if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
		return false;
	if (!svcxdr_decode_lock(xdr, &argp->lock))
		return false;
	if (exclusive)
		argp->lock.fl.fl_type = F_WRLCK;

	return true;
}

bool
nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
		return false;
	if (!svcxdr_decode_lock(xdr, &argp->lock))
		return false;
	argp->lock.fl.fl_type = F_UNLCK;

	return true;
}

bool
nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_res *resp = rqstp->rq_argp;

	if (!svcxdr_decode_cookie(xdr, &resp->cookie))
		return false;
	if (!svcxdr_decode_stats(xdr, &resp->status))
		return false;

	return true;
}

bool
nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_reboot *argp = rqstp->rq_argp;
	__be32 *p;
	u32 len;

	if (xdr_stream_decode_u32(xdr, &len) < 0)
		return false;
	if (len > SM_MAXSTRLEN)
		return false;
	p = xdr_inline_decode(xdr, len);
	if (!p)
		return false;
	argp->len = len;
	argp->mon = (char *)p;
	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
		return false;
	p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
	if (!p)
		return false;
	memcpy(&argp->priv.data, p, sizeof(argp->priv.data));

	return true;
}

bool
nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_lock	*lock = &argp->lock;

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

	if (!svcxdr_decode_cookie(xdr, &argp->cookie))
		return false;
	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
		return false;
	if (!svcxdr_decode_fhandle(xdr, &lock->fh))
		return false;
	if (!svcxdr_decode_owner(xdr, &lock->oh))
		return false;
	/* XXX: Range checks are missing in the original code */
	if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
		return false;
	if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
		return false;

	return true;
}

bool
nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
{
	struct nlm_args *argp = rqstp->rq_argp;
	struct nlm_lock	*lock = &argp->lock;

	if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
		return false;
	if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
		return false;

	return true;
}


/*
 * Encode Reply results
 */

int
nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
{
	return 1;
}

int
nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nlm_res *resp = rqstp->rq_resp;

	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
		svcxdr_encode_testrply(xdr, resp);
}

int
nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nlm_res *resp = rqstp->rq_resp;

	return svcxdr_encode_cookie(xdr, &resp->cookie) &&
		svcxdr_encode_stats(xdr, resp->status);
}

int
nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
{
	struct xdr_stream *xdr = &rqstp->rq_res_stream;
	struct nlm_res *resp = rqstp->rq_resp;

	if (!svcxdr_encode_cookie(xdr, &resp->cookie))
		return 0;
	if (!svcxdr_encode_stats(xdr, resp->status))
		return 0;
	/* sequence */
	if (xdr_stream_encode_u32(xdr, 0) < 0)
		return 0;

	return 1;
}