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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/xdr4.c
4 *
5 * XDR support for lockd and the lock client.
6 *
7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
9 */
10
11#include <linux/types.h>
12#include <linux/sched.h>
13#include <linux/nfs.h>
14
15#include <linux/sunrpc/xdr.h>
16#include <linux/sunrpc/clnt.h>
17#include <linux/sunrpc/svc.h>
18#include <linux/sunrpc/stats.h>
19#include <linux/lockd/lockd.h>
20
21#include "svcxdr.h"
22
23static inline loff_t
24s64_to_loff_t(__s64 offset)
25{
26 return (loff_t)offset;
27}
28
29
30static inline s64
31loff_t_to_s64(loff_t offset)
32{
33 s64 res;
34 if (offset > NLM4_OFFSET_MAX)
35 res = NLM4_OFFSET_MAX;
36 else if (offset < -NLM4_OFFSET_MAX)
37 res = -NLM4_OFFSET_MAX;
38 else
39 res = offset;
40 return res;
41}
42
43/*
44 * NLM file handles are defined by specification to be a variable-length
45 * XDR opaque no longer than 1024 bytes. However, this implementation
46 * limits their length to the size of an NFSv3 file handle.
47 */
48static bool
49svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
50{
51 __be32 *p;
52 u32 len;
53
54 if (xdr_stream_decode_u32(xdr, &len) < 0)
55 return false;
56 if (len > NFS_MAXFHSIZE)
57 return false;
58
59 p = xdr_inline_decode(xdr, len);
60 if (!p)
61 return false;
62 fh->size = len;
63 memcpy(fh->data, p, len);
64 memset(fh->data + len, 0, sizeof(fh->data) - len);
65
66 return true;
67}
68
69static bool
70svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
71{
72 struct file_lock *fl = &lock->fl;
73 u64 len, start;
74 s64 end;
75
76 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
77 return false;
78 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
79 return false;
80 if (!svcxdr_decode_owner(xdr, &lock->oh))
81 return false;
82 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
83 return false;
84 if (xdr_stream_decode_u64(xdr, &start) < 0)
85 return false;
86 if (xdr_stream_decode_u64(xdr, &len) < 0)
87 return false;
88
89 locks_init_lock(fl);
90 fl->fl_flags = FL_POSIX;
91 fl->fl_type = F_RDLCK;
92 end = start + len - 1;
93 fl->fl_start = s64_to_loff_t(start);
94 if (len == 0 || end < 0)
95 fl->fl_end = OFFSET_MAX;
96 else
97 fl->fl_end = s64_to_loff_t(end);
98
99 return true;
100}
101
102static bool
103svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
104{
105 const struct file_lock *fl = &lock->fl;
106 s64 start, len;
107
108 /* exclusive */
109 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
110 return false;
111 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
112 return false;
113 if (!svcxdr_encode_owner(xdr, &lock->oh))
114 return false;
115 start = loff_t_to_s64(fl->fl_start);
116 if (fl->fl_end == OFFSET_MAX)
117 len = 0;
118 else
119 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
120 if (xdr_stream_encode_u64(xdr, start) < 0)
121 return false;
122 if (xdr_stream_encode_u64(xdr, len) < 0)
123 return false;
124
125 return true;
126}
127
128static bool
129svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
130{
131 if (!svcxdr_encode_stats(xdr, resp->status))
132 return false;
133 switch (resp->status) {
134 case nlm_lck_denied:
135 if (!svcxdr_encode_holder(xdr, &resp->lock))
136 return false;
137 }
138
139 return true;
140}
141
142
143/*
144 * Decode Call arguments
145 */
146
147int
148nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
149{
150 return 1;
151}
152
153int
154nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
155{
156 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
157 struct nlm_args *argp = rqstp->rq_argp;
158 u32 exclusive;
159
160 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
161 return 0;
162 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
163 return 0;
164 if (!svcxdr_decode_lock(xdr, &argp->lock))
165 return 0;
166 if (exclusive)
167 argp->lock.fl.fl_type = F_WRLCK;
168
169 return 1;
170}
171
172int
173nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
174{
175 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
176 struct nlm_args *argp = rqstp->rq_argp;
177 u32 exclusive;
178
179 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
180 return 0;
181 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
182 return 0;
183 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
184 return 0;
185 if (!svcxdr_decode_lock(xdr, &argp->lock))
186 return 0;
187 if (exclusive)
188 argp->lock.fl.fl_type = F_WRLCK;
189 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
190 return 0;
191 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
192 return 0;
193 argp->monitor = 1; /* monitor client by default */
194
195 return 1;
196}
197
198int
199nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
200{
201 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
202 struct nlm_args *argp = rqstp->rq_argp;
203 u32 exclusive;
204
205 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
206 return 0;
207 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
208 return 0;
209 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
210 return 0;
211 if (!svcxdr_decode_lock(xdr, &argp->lock))
212 return 0;
213 if (exclusive)
214 argp->lock.fl.fl_type = F_WRLCK;
215 return 1;
216}
217
218int
219nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
220{
221 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
222 struct nlm_args *argp = rqstp->rq_argp;
223
224 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
225 return 0;
226 if (!svcxdr_decode_lock(xdr, &argp->lock))
227 return 0;
228 argp->lock.fl.fl_type = F_UNLCK;
229
230 return 1;
231}
232
233int
234nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
235{
236 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
237 struct nlm_res *resp = rqstp->rq_argp;
238
239 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
240 return 0;
241 if (!svcxdr_decode_stats(xdr, &resp->status))
242 return 0;
243
244 return 1;
245}
246
247int
248nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
249{
250 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
251 struct nlm_reboot *argp = rqstp->rq_argp;
252 u32 len;
253
254 if (xdr_stream_decode_u32(xdr, &len) < 0)
255 return 0;
256 if (len > SM_MAXSTRLEN)
257 return 0;
258 p = xdr_inline_decode(xdr, len);
259 if (!p)
260 return 0;
261 argp->len = len;
262 argp->mon = (char *)p;
263 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
264 return 0;
265 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
266 if (!p)
267 return 0;
268 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
269
270 return 1;
271}
272
273int
274nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
275{
276 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
277 struct nlm_args *argp = rqstp->rq_argp;
278 struct nlm_lock *lock = &argp->lock;
279
280 memset(lock, 0, sizeof(*lock));
281 locks_init_lock(&lock->fl);
282 lock->svid = ~(u32)0;
283
284 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
285 return 0;
286 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
287 return 0;
288 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
289 return 0;
290 if (!svcxdr_decode_owner(xdr, &lock->oh))
291 return 0;
292 /* XXX: Range checks are missing in the original code */
293 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
294 return 0;
295 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
296 return 0;
297
298 return 1;
299}
300
301int
302nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
303{
304 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
305 struct nlm_args *argp = rqstp->rq_argp;
306 struct nlm_lock *lock = &argp->lock;
307
308 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
309 return 0;
310 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
311 return 0;
312
313 return 1;
314}
315
316
317/*
318 * Encode Reply results
319 */
320
321int
322nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
323{
324 return 1;
325}
326
327int
328nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
329{
330 struct xdr_stream *xdr = &rqstp->rq_res_stream;
331 struct nlm_res *resp = rqstp->rq_resp;
332
333 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
334 svcxdr_encode_testrply(xdr, resp);
335}
336
337int
338nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
339{
340 struct xdr_stream *xdr = &rqstp->rq_res_stream;
341 struct nlm_res *resp = rqstp->rq_resp;
342
343 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
344 svcxdr_encode_stats(xdr, resp->status);
345}
346
347int
348nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
349{
350 struct xdr_stream *xdr = &rqstp->rq_res_stream;
351 struct nlm_res *resp = rqstp->rq_resp;
352
353 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
354 return 0;
355 if (!svcxdr_encode_stats(xdr, resp->status))
356 return 0;
357 /* sequence */
358 if (xdr_stream_encode_u32(xdr, 0) < 0)
359 return 0;
360
361 return 1;
362}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/xdr4.c
4 *
5 * XDR support for lockd and the lock client.
6 *
7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
9 */
10
11#include <linux/types.h>
12#include <linux/sched.h>
13#include <linux/nfs.h>
14
15#include <linux/sunrpc/xdr.h>
16#include <linux/sunrpc/clnt.h>
17#include <linux/sunrpc/svc.h>
18#include <linux/sunrpc/stats.h>
19#include <linux/lockd/lockd.h>
20
21#include "svcxdr.h"
22
23static inline s64
24loff_t_to_s64(loff_t offset)
25{
26 s64 res;
27 if (offset > NLM4_OFFSET_MAX)
28 res = NLM4_OFFSET_MAX;
29 else if (offset < -NLM4_OFFSET_MAX)
30 res = -NLM4_OFFSET_MAX;
31 else
32 res = offset;
33 return res;
34}
35
36/*
37 * NLM file handles are defined by specification to be a variable-length
38 * XDR opaque no longer than 1024 bytes. However, this implementation
39 * limits their length to the size of an NFSv3 file handle.
40 */
41static bool
42svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
43{
44 __be32 *p;
45 u32 len;
46
47 if (xdr_stream_decode_u32(xdr, &len) < 0)
48 return false;
49 if (len > NFS_MAXFHSIZE)
50 return false;
51
52 p = xdr_inline_decode(xdr, len);
53 if (!p)
54 return false;
55 fh->size = len;
56 memcpy(fh->data, p, len);
57 memset(fh->data + len, 0, sizeof(fh->data) - len);
58
59 return true;
60}
61
62static bool
63svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
64{
65 struct file_lock *fl = &lock->fl;
66
67 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
68 return false;
69 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
70 return false;
71 if (!svcxdr_decode_owner(xdr, &lock->oh))
72 return false;
73 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
74 return false;
75 if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0)
76 return false;
77 if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
78 return false;
79
80 locks_init_lock(fl);
81 fl->fl_flags = FL_POSIX;
82 fl->fl_type = F_RDLCK;
83
84 return true;
85}
86
87static bool
88svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
89{
90 const struct file_lock *fl = &lock->fl;
91 s64 start, len;
92
93 /* exclusive */
94 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
95 return false;
96 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
97 return false;
98 if (!svcxdr_encode_owner(xdr, &lock->oh))
99 return false;
100 start = loff_t_to_s64(fl->fl_start);
101 if (fl->fl_end == OFFSET_MAX)
102 len = 0;
103 else
104 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
105 if (xdr_stream_encode_u64(xdr, start) < 0)
106 return false;
107 if (xdr_stream_encode_u64(xdr, len) < 0)
108 return false;
109
110 return true;
111}
112
113static bool
114svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
115{
116 if (!svcxdr_encode_stats(xdr, resp->status))
117 return false;
118 switch (resp->status) {
119 case nlm_lck_denied:
120 if (!svcxdr_encode_holder(xdr, &resp->lock))
121 return false;
122 }
123
124 return true;
125}
126
127
128/*
129 * Decode Call arguments
130 */
131
132bool
133nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
134{
135 return true;
136}
137
138bool
139nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
140{
141 struct nlm_args *argp = rqstp->rq_argp;
142 u32 exclusive;
143
144 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
145 return false;
146 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
147 return false;
148 if (!svcxdr_decode_lock(xdr, &argp->lock))
149 return false;
150 if (exclusive)
151 argp->lock.fl.fl_type = F_WRLCK;
152
153 return true;
154}
155
156bool
157nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
158{
159 struct nlm_args *argp = rqstp->rq_argp;
160 u32 exclusive;
161
162 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
163 return false;
164 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
165 return false;
166 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
167 return false;
168 if (!svcxdr_decode_lock(xdr, &argp->lock))
169 return false;
170 if (exclusive)
171 argp->lock.fl.fl_type = F_WRLCK;
172 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
173 return false;
174 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
175 return false;
176 argp->monitor = 1; /* monitor client by default */
177
178 return true;
179}
180
181bool
182nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
183{
184 struct nlm_args *argp = rqstp->rq_argp;
185 u32 exclusive;
186
187 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
188 return false;
189 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
190 return false;
191 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
192 return false;
193 if (!svcxdr_decode_lock(xdr, &argp->lock))
194 return false;
195 if (exclusive)
196 argp->lock.fl.fl_type = F_WRLCK;
197
198 return true;
199}
200
201bool
202nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
203{
204 struct nlm_args *argp = rqstp->rq_argp;
205
206 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
207 return false;
208 if (!svcxdr_decode_lock(xdr, &argp->lock))
209 return false;
210 argp->lock.fl.fl_type = F_UNLCK;
211
212 return true;
213}
214
215bool
216nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
217{
218 struct nlm_res *resp = rqstp->rq_argp;
219
220 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
221 return false;
222 if (!svcxdr_decode_stats(xdr, &resp->status))
223 return false;
224
225 return true;
226}
227
228bool
229nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
230{
231 struct nlm_reboot *argp = rqstp->rq_argp;
232 __be32 *p;
233 u32 len;
234
235 if (xdr_stream_decode_u32(xdr, &len) < 0)
236 return false;
237 if (len > SM_MAXSTRLEN)
238 return false;
239 p = xdr_inline_decode(xdr, len);
240 if (!p)
241 return false;
242 argp->len = len;
243 argp->mon = (char *)p;
244 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
245 return false;
246 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
247 if (!p)
248 return false;
249 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
250
251 return true;
252}
253
254bool
255nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
256{
257 struct nlm_args *argp = rqstp->rq_argp;
258 struct nlm_lock *lock = &argp->lock;
259
260 memset(lock, 0, sizeof(*lock));
261 locks_init_lock(&lock->fl);
262 lock->svid = ~(u32)0;
263
264 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
265 return false;
266 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
267 return false;
268 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
269 return false;
270 if (!svcxdr_decode_owner(xdr, &lock->oh))
271 return false;
272 /* XXX: Range checks are missing in the original code */
273 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
274 return false;
275 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
276 return false;
277
278 return true;
279}
280
281bool
282nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
283{
284 struct nlm_args *argp = rqstp->rq_argp;
285 struct nlm_lock *lock = &argp->lock;
286
287 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
288 return false;
289 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
290 return false;
291
292 return true;
293}
294
295
296/*
297 * Encode Reply results
298 */
299
300bool
301nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
302{
303 return true;
304}
305
306bool
307nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
308{
309 struct nlm_res *resp = rqstp->rq_resp;
310
311 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
312 svcxdr_encode_testrply(xdr, resp);
313}
314
315bool
316nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
317{
318 struct nlm_res *resp = rqstp->rq_resp;
319
320 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
321 svcxdr_encode_stats(xdr, resp->status);
322}
323
324bool
325nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
326{
327 struct nlm_res *resp = rqstp->rq_resp;
328
329 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
330 return false;
331 if (!svcxdr_encode_stats(xdr, resp->status))
332 return false;
333 /* sequence */
334 if (xdr_stream_encode_u32(xdr, 0) < 0)
335 return false;
336
337 return true;
338}