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Linux kernel mirror (for testing)
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linux
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}