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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_owner = current->files;
130 fl->fl_pid = (pid_t)lock->svid;
131 fl->fl_flags = FL_POSIX;
132 fl->fl_type = F_RDLCK; /* as good as anything else */
133 start = ntohl(*p++);
134 len = ntohl(*p++);
135 end = start + len - 1;
136
137 fl->fl_start = s32_to_loff_t(start);
138
139 if (len == 0 || end < 0)
140 fl->fl_end = OFFSET_MAX;
141 else
142 fl->fl_end = s32_to_loff_t(end);
143 return p;
144}
145
146/*
147 * Encode result of a TEST/TEST_MSG call
148 */
149static __be32 *
150nlm_encode_testres(__be32 *p, struct nlm_res *resp)
151{
152 s32 start, len;
153
154 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
155 return NULL;
156 *p++ = resp->status;
157
158 if (resp->status == nlm_lck_denied) {
159 struct file_lock *fl = &resp->lock.fl;
160
161 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
162 *p++ = htonl(resp->lock.svid);
163
164 /* Encode owner handle. */
165 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
166 return NULL;
167
168 start = loff_t_to_s32(fl->fl_start);
169 if (fl->fl_end == OFFSET_MAX)
170 len = 0;
171 else
172 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
173
174 *p++ = htonl(start);
175 *p++ = htonl(len);
176 }
177
178 return p;
179}
180
181
182/*
183 * First, the server side XDR functions
184 */
185int
186nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
187{
188 struct nlm_args *argp = rqstp->rq_argp;
189 u32 exclusive;
190
191 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
192 return 0;
193
194 exclusive = ntohl(*p++);
195 if (!(p = nlm_decode_lock(p, &argp->lock)))
196 return 0;
197 if (exclusive)
198 argp->lock.fl.fl_type = F_WRLCK;
199
200 return xdr_argsize_check(rqstp, p);
201}
202
203int
204nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
205{
206 struct nlm_res *resp = rqstp->rq_resp;
207
208 if (!(p = nlm_encode_testres(p, resp)))
209 return 0;
210 return xdr_ressize_check(rqstp, p);
211}
212
213int
214nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
215{
216 struct nlm_args *argp = rqstp->rq_argp;
217 u32 exclusive;
218
219 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
220 return 0;
221 argp->block = ntohl(*p++);
222 exclusive = ntohl(*p++);
223 if (!(p = nlm_decode_lock(p, &argp->lock)))
224 return 0;
225 if (exclusive)
226 argp->lock.fl.fl_type = F_WRLCK;
227 argp->reclaim = ntohl(*p++);
228 argp->state = ntohl(*p++);
229 argp->monitor = 1; /* monitor client by default */
230
231 return xdr_argsize_check(rqstp, p);
232}
233
234int
235nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
236{
237 struct nlm_args *argp = rqstp->rq_argp;
238 u32 exclusive;
239
240 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
241 return 0;
242 argp->block = ntohl(*p++);
243 exclusive = ntohl(*p++);
244 if (!(p = nlm_decode_lock(p, &argp->lock)))
245 return 0;
246 if (exclusive)
247 argp->lock.fl.fl_type = F_WRLCK;
248 return xdr_argsize_check(rqstp, p);
249}
250
251int
252nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
253{
254 struct nlm_args *argp = rqstp->rq_argp;
255
256 if (!(p = nlm_decode_cookie(p, &argp->cookie))
257 || !(p = nlm_decode_lock(p, &argp->lock)))
258 return 0;
259 argp->lock.fl.fl_type = F_UNLCK;
260 return xdr_argsize_check(rqstp, p);
261}
262
263int
264nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
265{
266 struct nlm_args *argp = rqstp->rq_argp;
267 struct nlm_lock *lock = &argp->lock;
268
269 memset(lock, 0, sizeof(*lock));
270 locks_init_lock(&lock->fl);
271 lock->svid = ~(u32) 0;
272 lock->fl.fl_pid = (pid_t)lock->svid;
273
274 if (!(p = nlm_decode_cookie(p, &argp->cookie))
275 || !(p = xdr_decode_string_inplace(p, &lock->caller,
276 &lock->len, NLM_MAXSTRLEN))
277 || !(p = nlm_decode_fh(p, &lock->fh))
278 || !(p = nlm_decode_oh(p, &lock->oh)))
279 return 0;
280 argp->fsm_mode = ntohl(*p++);
281 argp->fsm_access = ntohl(*p++);
282 return xdr_argsize_check(rqstp, p);
283}
284
285int
286nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
287{
288 struct nlm_res *resp = rqstp->rq_resp;
289
290 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
291 return 0;
292 *p++ = resp->status;
293 *p++ = xdr_zero; /* sequence argument */
294 return xdr_ressize_check(rqstp, p);
295}
296
297int
298nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
299{
300 struct nlm_res *resp = rqstp->rq_resp;
301
302 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
303 return 0;
304 *p++ = resp->status;
305 return xdr_ressize_check(rqstp, p);
306}
307
308int
309nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
310{
311 struct nlm_args *argp = rqstp->rq_argp;
312 struct nlm_lock *lock = &argp->lock;
313
314 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
315 &lock->len, NLM_MAXSTRLEN)))
316 return 0;
317 argp->state = ntohl(*p++);
318 return xdr_argsize_check(rqstp, p);
319}
320
321int
322nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
323{
324 struct nlm_reboot *argp = rqstp->rq_argp;
325
326 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
327 return 0;
328 argp->state = ntohl(*p++);
329 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
330 p += XDR_QUADLEN(SM_PRIV_SIZE);
331 return xdr_argsize_check(rqstp, p);
332}
333
334int
335nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
336{
337 struct nlm_res *resp = rqstp->rq_argp;
338
339 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
340 return 0;
341 resp->status = *p++;
342 return xdr_argsize_check(rqstp, p);
343}
344
345int
346nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
347{
348 return xdr_argsize_check(rqstp, p);
349}
350
351int
352nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
353{
354 return xdr_ressize_check(rqstp, p);
355}
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}