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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/xdr.c
4 *
5 * XDR support for lockd and the lock client.
6 *
7 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
8 */
9
10#include <linux/types.h>
11#include <linux/sched.h>
12#include <linux/nfs.h>
13
14#include <linux/sunrpc/xdr.h>
15#include <linux/sunrpc/clnt.h>
16#include <linux/sunrpc/svc.h>
17#include <linux/sunrpc/stats.h>
18#include <linux/lockd/lockd.h>
19
20#include <uapi/linux/nfs2.h>
21
22#define NLMDBG_FACILITY NLMDBG_XDR
23
24
25static inline loff_t
26s32_to_loff_t(__s32 offset)
27{
28 return (loff_t)offset;
29}
30
31static inline __s32
32loff_t_to_s32(loff_t offset)
33{
34 __s32 res;
35 if (offset >= NLM_OFFSET_MAX)
36 res = NLM_OFFSET_MAX;
37 else if (offset <= -NLM_OFFSET_MAX)
38 res = -NLM_OFFSET_MAX;
39 else
40 res = offset;
41 return res;
42}
43
44/*
45 * XDR functions for basic NLM types
46 */
47static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
48{
49 unsigned int len;
50
51 len = ntohl(*p++);
52
53 if(len==0)
54 {
55 c->len=4;
56 memset(c->data, 0, 4); /* hockeypux brain damage */
57 }
58 else if(len<=NLM_MAXCOOKIELEN)
59 {
60 c->len=len;
61 memcpy(c->data, p, len);
62 p+=XDR_QUADLEN(len);
63 }
64 else
65 {
66 dprintk("lockd: bad cookie size %d (only cookies under "
67 "%d bytes are supported.)\n",
68 len, NLM_MAXCOOKIELEN);
69 return NULL;
70 }
71 return p;
72}
73
74static inline __be32 *
75nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
76{
77 *p++ = htonl(c->len);
78 memcpy(p, c->data, c->len);
79 p+=XDR_QUADLEN(c->len);
80 return p;
81}
82
83static __be32 *
84nlm_decode_fh(__be32 *p, struct nfs_fh *f)
85{
86 unsigned int len;
87
88 if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
89 dprintk("lockd: bad fhandle size %d (should be %d)\n",
90 len, NFS2_FHSIZE);
91 return NULL;
92 }
93 f->size = NFS2_FHSIZE;
94 memset(f->data, 0, sizeof(f->data));
95 memcpy(f->data, p, NFS2_FHSIZE);
96 return p + XDR_QUADLEN(NFS2_FHSIZE);
97}
98
99/*
100 * Encode and decode owner handle
101 */
102static inline __be32 *
103nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
104{
105 return xdr_decode_netobj(p, oh);
106}
107
108static inline __be32 *
109nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
110{
111 return xdr_encode_netobj(p, oh);
112}
113
114static __be32 *
115nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
116{
117 struct file_lock *fl = &lock->fl;
118 s32 start, len, end;
119
120 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
121 &lock->len,
122 NLM_MAXSTRLEN))
123 || !(p = nlm_decode_fh(p, &lock->fh))
124 || !(p = nlm_decode_oh(p, &lock->oh)))
125 return NULL;
126 lock->svid = ntohl(*p++);
127
128 locks_init_lock(fl);
129 fl->fl_flags = FL_POSIX;
130 fl->fl_type = F_RDLCK; /* as good as anything else */
131 start = ntohl(*p++);
132 len = ntohl(*p++);
133 end = start + len - 1;
134
135 fl->fl_start = s32_to_loff_t(start);
136
137 if (len == 0 || end < 0)
138 fl->fl_end = OFFSET_MAX;
139 else
140 fl->fl_end = s32_to_loff_t(end);
141 return p;
142}
143
144/*
145 * Encode result of a TEST/TEST_MSG call
146 */
147static __be32 *
148nlm_encode_testres(__be32 *p, struct nlm_res *resp)
149{
150 s32 start, len;
151
152 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
153 return NULL;
154 *p++ = resp->status;
155
156 if (resp->status == nlm_lck_denied) {
157 struct file_lock *fl = &resp->lock.fl;
158
159 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
160 *p++ = htonl(resp->lock.svid);
161
162 /* Encode owner handle. */
163 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
164 return NULL;
165
166 start = loff_t_to_s32(fl->fl_start);
167 if (fl->fl_end == OFFSET_MAX)
168 len = 0;
169 else
170 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
171
172 *p++ = htonl(start);
173 *p++ = htonl(len);
174 }
175
176 return p;
177}
178
179
180/*
181 * First, the server side XDR functions
182 */
183int
184nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
185{
186 struct nlm_args *argp = rqstp->rq_argp;
187 u32 exclusive;
188
189 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
190 return 0;
191
192 exclusive = ntohl(*p++);
193 if (!(p = nlm_decode_lock(p, &argp->lock)))
194 return 0;
195 if (exclusive)
196 argp->lock.fl.fl_type = F_WRLCK;
197
198 return xdr_argsize_check(rqstp, p);
199}
200
201int
202nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
203{
204 struct nlm_res *resp = rqstp->rq_resp;
205
206 if (!(p = nlm_encode_testres(p, resp)))
207 return 0;
208 return xdr_ressize_check(rqstp, p);
209}
210
211int
212nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
213{
214 struct nlm_args *argp = rqstp->rq_argp;
215 u32 exclusive;
216
217 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
218 return 0;
219 argp->block = ntohl(*p++);
220 exclusive = ntohl(*p++);
221 if (!(p = nlm_decode_lock(p, &argp->lock)))
222 return 0;
223 if (exclusive)
224 argp->lock.fl.fl_type = F_WRLCK;
225 argp->reclaim = ntohl(*p++);
226 argp->state = ntohl(*p++);
227 argp->monitor = 1; /* monitor client by default */
228
229 return xdr_argsize_check(rqstp, p);
230}
231
232int
233nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
234{
235 struct nlm_args *argp = rqstp->rq_argp;
236 u32 exclusive;
237
238 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
239 return 0;
240 argp->block = ntohl(*p++);
241 exclusive = ntohl(*p++);
242 if (!(p = nlm_decode_lock(p, &argp->lock)))
243 return 0;
244 if (exclusive)
245 argp->lock.fl.fl_type = F_WRLCK;
246 return xdr_argsize_check(rqstp, p);
247}
248
249int
250nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
251{
252 struct nlm_args *argp = rqstp->rq_argp;
253
254 if (!(p = nlm_decode_cookie(p, &argp->cookie))
255 || !(p = nlm_decode_lock(p, &argp->lock)))
256 return 0;
257 argp->lock.fl.fl_type = F_UNLCK;
258 return xdr_argsize_check(rqstp, p);
259}
260
261int
262nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
263{
264 struct nlm_args *argp = rqstp->rq_argp;
265 struct nlm_lock *lock = &argp->lock;
266
267 memset(lock, 0, sizeof(*lock));
268 locks_init_lock(&lock->fl);
269 lock->svid = ~(u32) 0;
270
271 if (!(p = nlm_decode_cookie(p, &argp->cookie))
272 || !(p = xdr_decode_string_inplace(p, &lock->caller,
273 &lock->len, NLM_MAXSTRLEN))
274 || !(p = nlm_decode_fh(p, &lock->fh))
275 || !(p = nlm_decode_oh(p, &lock->oh)))
276 return 0;
277 argp->fsm_mode = ntohl(*p++);
278 argp->fsm_access = ntohl(*p++);
279 return xdr_argsize_check(rqstp, p);
280}
281
282int
283nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
284{
285 struct nlm_res *resp = rqstp->rq_resp;
286
287 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
288 return 0;
289 *p++ = resp->status;
290 *p++ = xdr_zero; /* sequence argument */
291 return xdr_ressize_check(rqstp, p);
292}
293
294int
295nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
296{
297 struct nlm_res *resp = rqstp->rq_resp;
298
299 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
300 return 0;
301 *p++ = resp->status;
302 return xdr_ressize_check(rqstp, p);
303}
304
305int
306nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
307{
308 struct nlm_args *argp = rqstp->rq_argp;
309 struct nlm_lock *lock = &argp->lock;
310
311 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
312 &lock->len, NLM_MAXSTRLEN)))
313 return 0;
314 argp->state = ntohl(*p++);
315 return xdr_argsize_check(rqstp, p);
316}
317
318int
319nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
320{
321 struct nlm_reboot *argp = rqstp->rq_argp;
322
323 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
324 return 0;
325 argp->state = ntohl(*p++);
326 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
327 p += XDR_QUADLEN(SM_PRIV_SIZE);
328 return xdr_argsize_check(rqstp, p);
329}
330
331int
332nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
333{
334 struct nlm_res *resp = rqstp->rq_argp;
335
336 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
337 return 0;
338 resp->status = *p++;
339 return xdr_argsize_check(rqstp, p);
340}
341
342int
343nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
344{
345 return xdr_argsize_check(rqstp, p);
346}
347
348int
349nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
350{
351 return xdr_ressize_check(rqstp, p);
352}
1/*
2 * linux/fs/lockd/xdr.c
3 *
4 * XDR support for lockd and the lock client.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#include <linux/types.h>
10#include <linux/sched.h>
11#include <linux/nfs.h>
12
13#include <linux/sunrpc/xdr.h>
14#include <linux/sunrpc/clnt.h>
15#include <linux/sunrpc/svc.h>
16#include <linux/sunrpc/stats.h>
17#include <linux/lockd/lockd.h>
18
19#include <uapi/linux/nfs2.h>
20
21#define NLMDBG_FACILITY NLMDBG_XDR
22
23
24static inline loff_t
25s32_to_loff_t(__s32 offset)
26{
27 return (loff_t)offset;
28}
29
30static inline __s32
31loff_t_to_s32(loff_t offset)
32{
33 __s32 res;
34 if (offset >= NLM_OFFSET_MAX)
35 res = NLM_OFFSET_MAX;
36 else if (offset <= -NLM_OFFSET_MAX)
37 res = -NLM_OFFSET_MAX;
38 else
39 res = offset;
40 return res;
41}
42
43/*
44 * XDR functions for basic NLM types
45 */
46static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
47{
48 unsigned int len;
49
50 len = ntohl(*p++);
51
52 if(len==0)
53 {
54 c->len=4;
55 memset(c->data, 0, 4); /* hockeypux brain damage */
56 }
57 else if(len<=NLM_MAXCOOKIELEN)
58 {
59 c->len=len;
60 memcpy(c->data, p, len);
61 p+=XDR_QUADLEN(len);
62 }
63 else
64 {
65 dprintk("lockd: bad cookie size %d (only cookies under "
66 "%d bytes are supported.)\n",
67 len, NLM_MAXCOOKIELEN);
68 return NULL;
69 }
70 return p;
71}
72
73static inline __be32 *
74nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
75{
76 *p++ = htonl(c->len);
77 memcpy(p, c->data, c->len);
78 p+=XDR_QUADLEN(c->len);
79 return p;
80}
81
82static __be32 *
83nlm_decode_fh(__be32 *p, struct nfs_fh *f)
84{
85 unsigned int len;
86
87 if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
88 dprintk("lockd: bad fhandle size %d (should be %d)\n",
89 len, NFS2_FHSIZE);
90 return NULL;
91 }
92 f->size = NFS2_FHSIZE;
93 memset(f->data, 0, sizeof(f->data));
94 memcpy(f->data, p, NFS2_FHSIZE);
95 return p + XDR_QUADLEN(NFS2_FHSIZE);
96}
97
98/*
99 * Encode and decode owner handle
100 */
101static inline __be32 *
102nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
103{
104 return xdr_decode_netobj(p, oh);
105}
106
107static inline __be32 *
108nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
109{
110 return xdr_encode_netobj(p, oh);
111}
112
113static __be32 *
114nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
115{
116 struct file_lock *fl = &lock->fl;
117 s32 start, len, end;
118
119 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
120 &lock->len,
121 NLM_MAXSTRLEN))
122 || !(p = nlm_decode_fh(p, &lock->fh))
123 || !(p = nlm_decode_oh(p, &lock->oh)))
124 return NULL;
125 lock->svid = ntohl(*p++);
126
127 locks_init_lock(fl);
128 fl->fl_owner = current->files;
129 fl->fl_pid = (pid_t)lock->svid;
130 fl->fl_flags = FL_POSIX;
131 fl->fl_type = F_RDLCK; /* as good as anything else */
132 start = ntohl(*p++);
133 len = ntohl(*p++);
134 end = start + len - 1;
135
136 fl->fl_start = s32_to_loff_t(start);
137
138 if (len == 0 || end < 0)
139 fl->fl_end = OFFSET_MAX;
140 else
141 fl->fl_end = s32_to_loff_t(end);
142 return p;
143}
144
145/*
146 * Encode result of a TEST/TEST_MSG call
147 */
148static __be32 *
149nlm_encode_testres(__be32 *p, struct nlm_res *resp)
150{
151 s32 start, len;
152
153 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
154 return NULL;
155 *p++ = resp->status;
156
157 if (resp->status == nlm_lck_denied) {
158 struct file_lock *fl = &resp->lock.fl;
159
160 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
161 *p++ = htonl(resp->lock.svid);
162
163 /* Encode owner handle. */
164 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
165 return NULL;
166
167 start = loff_t_to_s32(fl->fl_start);
168 if (fl->fl_end == OFFSET_MAX)
169 len = 0;
170 else
171 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
172
173 *p++ = htonl(start);
174 *p++ = htonl(len);
175 }
176
177 return p;
178}
179
180
181/*
182 * First, the server side XDR functions
183 */
184int
185nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
186{
187 u32 exclusive;
188
189 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
190 return 0;
191
192 exclusive = ntohl(*p++);
193 if (!(p = nlm_decode_lock(p, &argp->lock)))
194 return 0;
195 if (exclusive)
196 argp->lock.fl.fl_type = F_WRLCK;
197
198 return xdr_argsize_check(rqstp, p);
199}
200
201int
202nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
203{
204 if (!(p = nlm_encode_testres(p, resp)))
205 return 0;
206 return xdr_ressize_check(rqstp, p);
207}
208
209int
210nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
211{
212 u32 exclusive;
213
214 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
215 return 0;
216 argp->block = ntohl(*p++);
217 exclusive = ntohl(*p++);
218 if (!(p = nlm_decode_lock(p, &argp->lock)))
219 return 0;
220 if (exclusive)
221 argp->lock.fl.fl_type = F_WRLCK;
222 argp->reclaim = ntohl(*p++);
223 argp->state = ntohl(*p++);
224 argp->monitor = 1; /* monitor client by default */
225
226 return xdr_argsize_check(rqstp, p);
227}
228
229int
230nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
231{
232 u32 exclusive;
233
234 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
235 return 0;
236 argp->block = ntohl(*p++);
237 exclusive = ntohl(*p++);
238 if (!(p = nlm_decode_lock(p, &argp->lock)))
239 return 0;
240 if (exclusive)
241 argp->lock.fl.fl_type = F_WRLCK;
242 return xdr_argsize_check(rqstp, p);
243}
244
245int
246nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
247{
248 if (!(p = nlm_decode_cookie(p, &argp->cookie))
249 || !(p = nlm_decode_lock(p, &argp->lock)))
250 return 0;
251 argp->lock.fl.fl_type = F_UNLCK;
252 return xdr_argsize_check(rqstp, p);
253}
254
255int
256nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
257{
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 lock->fl.fl_pid = (pid_t)lock->svid;
264
265 if (!(p = nlm_decode_cookie(p, &argp->cookie))
266 || !(p = xdr_decode_string_inplace(p, &lock->caller,
267 &lock->len, NLM_MAXSTRLEN))
268 || !(p = nlm_decode_fh(p, &lock->fh))
269 || !(p = nlm_decode_oh(p, &lock->oh)))
270 return 0;
271 argp->fsm_mode = ntohl(*p++);
272 argp->fsm_access = ntohl(*p++);
273 return xdr_argsize_check(rqstp, p);
274}
275
276int
277nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
278{
279 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
280 return 0;
281 *p++ = resp->status;
282 *p++ = xdr_zero; /* sequence argument */
283 return xdr_ressize_check(rqstp, p);
284}
285
286int
287nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
288{
289 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
290 return 0;
291 *p++ = resp->status;
292 return xdr_ressize_check(rqstp, p);
293}
294
295int
296nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
297{
298 struct nlm_lock *lock = &argp->lock;
299
300 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
301 &lock->len, NLM_MAXSTRLEN)))
302 return 0;
303 argp->state = ntohl(*p++);
304 return xdr_argsize_check(rqstp, p);
305}
306
307int
308nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
309{
310 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
311 return 0;
312 argp->state = ntohl(*p++);
313 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
314 p += XDR_QUADLEN(SM_PRIV_SIZE);
315 return xdr_argsize_check(rqstp, p);
316}
317
318int
319nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
320{
321 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
322 return 0;
323 resp->status = *p++;
324 return xdr_argsize_check(rqstp, p);
325}
326
327int
328nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
329{
330 return xdr_argsize_check(rqstp, p);
331}
332
333int
334nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
335{
336 return xdr_ressize_check(rqstp, p);
337}