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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#include "svcxdr.h"
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 * NLM file handles are defined by specification to be a variable-length
46 * XDR opaque no longer than 1024 bytes. However, this implementation
47 * constrains their length to exactly the length of an NFSv2 file
48 * handle.
49 */
50static bool
51svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
52{
53 __be32 *p;
54 u32 len;
55
56 if (xdr_stream_decode_u32(xdr, &len) < 0)
57 return false;
58 if (len != NFS2_FHSIZE)
59 return false;
60
61 p = xdr_inline_decode(xdr, len);
62 if (!p)
63 return false;
64 fh->size = NFS2_FHSIZE;
65 memcpy(fh->data, p, len);
66 memset(fh->data + NFS2_FHSIZE, 0, sizeof(fh->data) - NFS2_FHSIZE);
67
68 return true;
69}
70
71static bool
72svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
73{
74 struct file_lock *fl = &lock->fl;
75 s32 start, len, end;
76
77 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
78 return false;
79 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
80 return false;
81 if (!svcxdr_decode_owner(xdr, &lock->oh))
82 return false;
83 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
84 return false;
85 if (xdr_stream_decode_u32(xdr, &start) < 0)
86 return false;
87 if (xdr_stream_decode_u32(xdr, &len) < 0)
88 return false;
89
90 locks_init_lock(fl);
91 fl->c.flc_flags = FL_POSIX;
92 fl->c.flc_type = F_RDLCK;
93 end = start + len - 1;
94 fl->fl_start = s32_to_loff_t(start);
95 if (len == 0 || end < 0)
96 fl->fl_end = OFFSET_MAX;
97 else
98 fl->fl_end = s32_to_loff_t(end);
99
100 return true;
101}
102
103static bool
104svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
105{
106 const struct file_lock *fl = &lock->fl;
107 s32 start, len;
108
109 /* exclusive */
110 if (xdr_stream_encode_bool(xdr, fl->c.flc_type != F_RDLCK) < 0)
111 return false;
112 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
113 return false;
114 if (!svcxdr_encode_owner(xdr, &lock->oh))
115 return false;
116 start = loff_t_to_s32(fl->fl_start);
117 if (fl->fl_end == OFFSET_MAX)
118 len = 0;
119 else
120 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
121 if (xdr_stream_encode_u32(xdr, start) < 0)
122 return false;
123 if (xdr_stream_encode_u32(xdr, len) < 0)
124 return false;
125
126 return true;
127}
128
129static bool
130svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
131{
132 if (!svcxdr_encode_stats(xdr, resp->status))
133 return false;
134 switch (resp->status) {
135 case nlm_lck_denied:
136 if (!svcxdr_encode_holder(xdr, &resp->lock))
137 return false;
138 }
139
140 return true;
141}
142
143
144/*
145 * Decode Call arguments
146 */
147
148bool
149nlmsvc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
150{
151 return true;
152}
153
154bool
155nlmsvc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
156{
157 struct nlm_args *argp = rqstp->rq_argp;
158 u32 exclusive;
159
160 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
161 return false;
162 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
163 return false;
164 if (!svcxdr_decode_lock(xdr, &argp->lock))
165 return false;
166 if (exclusive)
167 argp->lock.fl.c.flc_type = F_WRLCK;
168
169 return true;
170}
171
172bool
173nlmsvc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
174{
175 struct nlm_args *argp = rqstp->rq_argp;
176 u32 exclusive;
177
178 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
179 return false;
180 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
181 return false;
182 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
183 return false;
184 if (!svcxdr_decode_lock(xdr, &argp->lock))
185 return false;
186 if (exclusive)
187 argp->lock.fl.c.flc_type = F_WRLCK;
188 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
189 return false;
190 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
191 return false;
192 argp->monitor = 1; /* monitor client by default */
193
194 return true;
195}
196
197bool
198nlmsvc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
199{
200 struct nlm_args *argp = rqstp->rq_argp;
201 u32 exclusive;
202
203 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
204 return false;
205 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
206 return false;
207 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
208 return false;
209 if (!svcxdr_decode_lock(xdr, &argp->lock))
210 return false;
211 if (exclusive)
212 argp->lock.fl.c.flc_type = F_WRLCK;
213
214 return true;
215}
216
217bool
218nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
219{
220 struct nlm_args *argp = rqstp->rq_argp;
221
222 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
223 return false;
224 if (!svcxdr_decode_lock(xdr, &argp->lock))
225 return false;
226 argp->lock.fl.c.flc_type = F_UNLCK;
227
228 return true;
229}
230
231bool
232nlmsvc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
233{
234 struct nlm_res *resp = rqstp->rq_argp;
235
236 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
237 return false;
238 if (!svcxdr_decode_stats(xdr, &resp->status))
239 return false;
240
241 return true;
242}
243
244bool
245nlmsvc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
246{
247 struct nlm_reboot *argp = rqstp->rq_argp;
248 __be32 *p;
249 u32 len;
250
251 if (xdr_stream_decode_u32(xdr, &len) < 0)
252 return false;
253 if (len > SM_MAXSTRLEN)
254 return false;
255 p = xdr_inline_decode(xdr, len);
256 if (!p)
257 return false;
258 argp->len = len;
259 argp->mon = (char *)p;
260 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
261 return false;
262 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
263 if (!p)
264 return false;
265 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
266
267 return true;
268}
269
270bool
271nlmsvc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
272{
273 struct nlm_args *argp = rqstp->rq_argp;
274 struct nlm_lock *lock = &argp->lock;
275
276 memset(lock, 0, sizeof(*lock));
277 locks_init_lock(&lock->fl);
278 lock->svid = ~(u32)0;
279
280 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
281 return false;
282 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
283 return false;
284 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
285 return false;
286 if (!svcxdr_decode_owner(xdr, &lock->oh))
287 return false;
288 /* XXX: Range checks are missing in the original code */
289 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
290 return false;
291 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
292 return false;
293
294 return true;
295}
296
297bool
298nlmsvc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
299{
300 struct nlm_args *argp = rqstp->rq_argp;
301 struct nlm_lock *lock = &argp->lock;
302
303 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
304 return false;
305 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
306 return false;
307
308 return true;
309}
310
311
312/*
313 * Encode Reply results
314 */
315
316bool
317nlmsvc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
318{
319 return true;
320}
321
322bool
323nlmsvc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
324{
325 struct nlm_res *resp = rqstp->rq_resp;
326
327 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
328 svcxdr_encode_testrply(xdr, resp);
329}
330
331bool
332nlmsvc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
333{
334 struct nlm_res *resp = rqstp->rq_resp;
335
336 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
337 svcxdr_encode_stats(xdr, resp->status);
338}
339
340bool
341nlmsvc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
342{
343 struct nlm_res *resp = rqstp->rq_resp;
344
345 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
346 return false;
347 if (!svcxdr_encode_stats(xdr, resp->status))
348 return false;
349 /* sequence */
350 if (xdr_stream_encode_u32(xdr, 0) < 0)
351 return false;
352
353 return true;
354}
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}