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1/*
2 * linux/fs/lockd/xdr4.c
3 *
4 * XDR support for lockd and the lock client.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
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#define NLMDBG_FACILITY NLMDBG_XDR
21
22static inline loff_t
23s64_to_loff_t(__s64 offset)
24{
25 return (loff_t)offset;
26}
27
28
29static inline s64
30loff_t_to_s64(loff_t offset)
31{
32 s64 res;
33 if (offset > NLM4_OFFSET_MAX)
34 res = NLM4_OFFSET_MAX;
35 else if (offset < -NLM4_OFFSET_MAX)
36 res = -NLM4_OFFSET_MAX;
37 else
38 res = offset;
39 return res;
40}
41
42/*
43 * XDR functions for basic NLM types
44 */
45static __be32 *
46nlm4_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 __be32 *
74nlm4_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 *
83nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
84{
85 memset(f->data, 0, sizeof(f->data));
86 f->size = ntohl(*p++);
87 if (f->size > NFS_MAXFHSIZE) {
88 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
89 f->size, NFS_MAXFHSIZE);
90 return NULL;
91 }
92 memcpy(f->data, p, f->size);
93 return p + XDR_QUADLEN(f->size);
94}
95
96/*
97 * Encode and decode owner handle
98 */
99static __be32 *
100nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
101{
102 return xdr_decode_netobj(p, oh);
103}
104
105static __be32 *
106nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
107{
108 struct file_lock *fl = &lock->fl;
109 __u64 len, start;
110 __s64 end;
111
112 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
113 &lock->len, NLM_MAXSTRLEN))
114 || !(p = nlm4_decode_fh(p, &lock->fh))
115 || !(p = nlm4_decode_oh(p, &lock->oh)))
116 return NULL;
117 lock->svid = ntohl(*p++);
118
119 locks_init_lock(fl);
120 fl->fl_owner = current->files;
121 fl->fl_pid = (pid_t)lock->svid;
122 fl->fl_flags = FL_POSIX;
123 fl->fl_type = F_RDLCK; /* as good as anything else */
124 p = xdr_decode_hyper(p, &start);
125 p = xdr_decode_hyper(p, &len);
126 end = start + len - 1;
127
128 fl->fl_start = s64_to_loff_t(start);
129
130 if (len == 0 || end < 0)
131 fl->fl_end = OFFSET_MAX;
132 else
133 fl->fl_end = s64_to_loff_t(end);
134 return p;
135}
136
137/*
138 * Encode result of a TEST/TEST_MSG call
139 */
140static __be32 *
141nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
142{
143 s64 start, len;
144
145 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
146 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
147 return NULL;
148 *p++ = resp->status;
149
150 if (resp->status == nlm_lck_denied) {
151 struct file_lock *fl = &resp->lock.fl;
152
153 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
154 *p++ = htonl(resp->lock.svid);
155
156 /* Encode owner handle. */
157 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
158 return NULL;
159
160 start = loff_t_to_s64(fl->fl_start);
161 if (fl->fl_end == OFFSET_MAX)
162 len = 0;
163 else
164 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
165
166 p = xdr_encode_hyper(p, start);
167 p = xdr_encode_hyper(p, len);
168 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
169 resp->status, (int)resp->lock.svid, fl->fl_type,
170 (long long)fl->fl_start, (long long)fl->fl_end);
171 }
172
173 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
174 return p;
175}
176
177
178/*
179 * First, the server side XDR functions
180 */
181int
182nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
183{
184 u32 exclusive;
185
186 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
187 return 0;
188
189 exclusive = ntohl(*p++);
190 if (!(p = nlm4_decode_lock(p, &argp->lock)))
191 return 0;
192 if (exclusive)
193 argp->lock.fl.fl_type = F_WRLCK;
194
195 return xdr_argsize_check(rqstp, p);
196}
197
198int
199nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
200{
201 if (!(p = nlm4_encode_testres(p, resp)))
202 return 0;
203 return xdr_ressize_check(rqstp, p);
204}
205
206int
207nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
208{
209 u32 exclusive;
210
211 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
212 return 0;
213 argp->block = ntohl(*p++);
214 exclusive = ntohl(*p++);
215 if (!(p = nlm4_decode_lock(p, &argp->lock)))
216 return 0;
217 if (exclusive)
218 argp->lock.fl.fl_type = F_WRLCK;
219 argp->reclaim = ntohl(*p++);
220 argp->state = ntohl(*p++);
221 argp->monitor = 1; /* monitor client by default */
222
223 return xdr_argsize_check(rqstp, p);
224}
225
226int
227nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
228{
229 u32 exclusive;
230
231 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
232 return 0;
233 argp->block = ntohl(*p++);
234 exclusive = ntohl(*p++);
235 if (!(p = nlm4_decode_lock(p, &argp->lock)))
236 return 0;
237 if (exclusive)
238 argp->lock.fl.fl_type = F_WRLCK;
239 return xdr_argsize_check(rqstp, p);
240}
241
242int
243nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
244{
245 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
246 || !(p = nlm4_decode_lock(p, &argp->lock)))
247 return 0;
248 argp->lock.fl.fl_type = F_UNLCK;
249 return xdr_argsize_check(rqstp, p);
250}
251
252int
253nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
254{
255 struct nlm_lock *lock = &argp->lock;
256
257 memset(lock, 0, sizeof(*lock));
258 locks_init_lock(&lock->fl);
259 lock->svid = ~(u32) 0;
260 lock->fl.fl_pid = (pid_t)lock->svid;
261
262 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
263 || !(p = xdr_decode_string_inplace(p, &lock->caller,
264 &lock->len, NLM_MAXSTRLEN))
265 || !(p = nlm4_decode_fh(p, &lock->fh))
266 || !(p = nlm4_decode_oh(p, &lock->oh)))
267 return 0;
268 argp->fsm_mode = ntohl(*p++);
269 argp->fsm_access = ntohl(*p++);
270 return xdr_argsize_check(rqstp, p);
271}
272
273int
274nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
275{
276 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
277 return 0;
278 *p++ = resp->status;
279 *p++ = xdr_zero; /* sequence argument */
280 return xdr_ressize_check(rqstp, p);
281}
282
283int
284nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
285{
286 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
287 return 0;
288 *p++ = resp->status;
289 return xdr_ressize_check(rqstp, p);
290}
291
292int
293nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
294{
295 struct nlm_lock *lock = &argp->lock;
296
297 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
298 &lock->len, NLM_MAXSTRLEN)))
299 return 0;
300 argp->state = ntohl(*p++);
301 return xdr_argsize_check(rqstp, p);
302}
303
304int
305nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
306{
307 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
308 return 0;
309 argp->state = ntohl(*p++);
310 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
311 p += XDR_QUADLEN(SM_PRIV_SIZE);
312 return xdr_argsize_check(rqstp, p);
313}
314
315int
316nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
317{
318 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
319 return 0;
320 resp->status = *p++;
321 return xdr_argsize_check(rqstp, p);
322}
323
324int
325nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
326{
327 return xdr_argsize_check(rqstp, p);
328}
329
330int
331nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
332{
333 return xdr_ressize_check(rqstp, p);
334}
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#define NLMDBG_FACILITY NLMDBG_XDR
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 * XDR functions for basic NLM types
45 */
46static __be32 *
47nlm4_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 __be32 *
75nlm4_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 *
84nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
85{
86 memset(f->data, 0, sizeof(f->data));
87 f->size = ntohl(*p++);
88 if (f->size > NFS_MAXFHSIZE) {
89 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
90 f->size, NFS_MAXFHSIZE);
91 return NULL;
92 }
93 memcpy(f->data, p, f->size);
94 return p + XDR_QUADLEN(f->size);
95}
96
97/*
98 * Encode and decode owner handle
99 */
100static __be32 *
101nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
102{
103 return xdr_decode_netobj(p, oh);
104}
105
106static __be32 *
107nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
108{
109 struct file_lock *fl = &lock->fl;
110 __u64 len, start;
111 __s64 end;
112
113 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
114 &lock->len, NLM_MAXSTRLEN))
115 || !(p = nlm4_decode_fh(p, &lock->fh))
116 || !(p = nlm4_decode_oh(p, &lock->oh)))
117 return NULL;
118 lock->svid = ntohl(*p++);
119
120 locks_init_lock(fl);
121 fl->fl_owner = current->files;
122 fl->fl_pid = (pid_t)lock->svid;
123 fl->fl_flags = FL_POSIX;
124 fl->fl_type = F_RDLCK; /* as good as anything else */
125 p = xdr_decode_hyper(p, &start);
126 p = xdr_decode_hyper(p, &len);
127 end = start + len - 1;
128
129 fl->fl_start = s64_to_loff_t(start);
130
131 if (len == 0 || end < 0)
132 fl->fl_end = OFFSET_MAX;
133 else
134 fl->fl_end = s64_to_loff_t(end);
135 return p;
136}
137
138/*
139 * Encode result of a TEST/TEST_MSG call
140 */
141static __be32 *
142nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
143{
144 s64 start, len;
145
146 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
147 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
148 return NULL;
149 *p++ = resp->status;
150
151 if (resp->status == nlm_lck_denied) {
152 struct file_lock *fl = &resp->lock.fl;
153
154 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
155 *p++ = htonl(resp->lock.svid);
156
157 /* Encode owner handle. */
158 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
159 return NULL;
160
161 start = loff_t_to_s64(fl->fl_start);
162 if (fl->fl_end == OFFSET_MAX)
163 len = 0;
164 else
165 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
166
167 p = xdr_encode_hyper(p, start);
168 p = xdr_encode_hyper(p, len);
169 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
170 resp->status, (int)resp->lock.svid, fl->fl_type,
171 (long long)fl->fl_start, (long long)fl->fl_end);
172 }
173
174 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
175 return p;
176}
177
178
179/*
180 * First, the server side XDR functions
181 */
182int
183nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
184{
185 struct nlm_args *argp = rqstp->rq_argp;
186 u32 exclusive;
187
188 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
189 return 0;
190
191 exclusive = ntohl(*p++);
192 if (!(p = nlm4_decode_lock(p, &argp->lock)))
193 return 0;
194 if (exclusive)
195 argp->lock.fl.fl_type = F_WRLCK;
196
197 return xdr_argsize_check(rqstp, p);
198}
199
200int
201nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
202{
203 struct nlm_res *resp = rqstp->rq_resp;
204
205 if (!(p = nlm4_encode_testres(p, resp)))
206 return 0;
207 return xdr_ressize_check(rqstp, p);
208}
209
210int
211nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
212{
213 struct nlm_args *argp = rqstp->rq_argp;
214 u32 exclusive;
215
216 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
217 return 0;
218 argp->block = ntohl(*p++);
219 exclusive = ntohl(*p++);
220 if (!(p = nlm4_decode_lock(p, &argp->lock)))
221 return 0;
222 if (exclusive)
223 argp->lock.fl.fl_type = F_WRLCK;
224 argp->reclaim = ntohl(*p++);
225 argp->state = ntohl(*p++);
226 argp->monitor = 1; /* monitor client by default */
227
228 return xdr_argsize_check(rqstp, p);
229}
230
231int
232nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
233{
234 struct nlm_args *argp = rqstp->rq_argp;
235 u32 exclusive;
236
237 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
238 return 0;
239 argp->block = ntohl(*p++);
240 exclusive = ntohl(*p++);
241 if (!(p = nlm4_decode_lock(p, &argp->lock)))
242 return 0;
243 if (exclusive)
244 argp->lock.fl.fl_type = F_WRLCK;
245 return xdr_argsize_check(rqstp, p);
246}
247
248int
249nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
250{
251 struct nlm_args *argp = rqstp->rq_argp;
252
253 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
254 || !(p = nlm4_decode_lock(p, &argp->lock)))
255 return 0;
256 argp->lock.fl.fl_type = F_UNLCK;
257 return xdr_argsize_check(rqstp, p);
258}
259
260int
261nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
262{
263 struct nlm_args *argp = rqstp->rq_argp;
264 struct nlm_lock *lock = &argp->lock;
265
266 memset(lock, 0, sizeof(*lock));
267 locks_init_lock(&lock->fl);
268 lock->svid = ~(u32) 0;
269 lock->fl.fl_pid = (pid_t)lock->svid;
270
271 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
272 || !(p = xdr_decode_string_inplace(p, &lock->caller,
273 &lock->len, NLM_MAXSTRLEN))
274 || !(p = nlm4_decode_fh(p, &lock->fh))
275 || !(p = nlm4_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
283nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
284{
285 struct nlm_res *resp = rqstp->rq_resp;
286
287 if (!(p = nlm4_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
295nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
296{
297 struct nlm_res *resp = rqstp->rq_resp;
298
299 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
300 return 0;
301 *p++ = resp->status;
302 return xdr_ressize_check(rqstp, p);
303}
304
305int
306nlm4svc_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
319nlm4svc_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
332nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
333{
334 struct nlm_res *resp = rqstp->rq_argp;
335
336 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
337 return 0;
338 resp->status = *p++;
339 return xdr_argsize_check(rqstp, p);
340}
341
342int
343nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
344{
345 return xdr_argsize_check(rqstp, p);
346}
347
348int
349nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
350{
351 return xdr_ressize_check(rqstp, p);
352}