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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#define NLMDBG_FACILITY NLMDBG_XDR
20
21
22static inline loff_t
23s32_to_loff_t(__s32 offset)
24{
25 return (loff_t)offset;
26}
27
28static inline __s32
29loff_t_to_s32(loff_t offset)
30{
31 __s32 res;
32 if (offset >= NLM_OFFSET_MAX)
33 res = NLM_OFFSET_MAX;
34 else if (offset <= -NLM_OFFSET_MAX)
35 res = -NLM_OFFSET_MAX;
36 else
37 res = offset;
38 return res;
39}
40
41/*
42 * XDR functions for basic NLM types
43 */
44static __be32 *nlm_decode_cookie(__be32 *p, struct nlm_cookie *c)
45{
46 unsigned int len;
47
48 len = ntohl(*p++);
49
50 if(len==0)
51 {
52 c->len=4;
53 memset(c->data, 0, 4); /* hockeypux brain damage */
54 }
55 else if(len<=NLM_MAXCOOKIELEN)
56 {
57 c->len=len;
58 memcpy(c->data, p, len);
59 p+=XDR_QUADLEN(len);
60 }
61 else
62 {
63 dprintk("lockd: bad cookie size %d (only cookies under "
64 "%d bytes are supported.)\n",
65 len, NLM_MAXCOOKIELEN);
66 return NULL;
67 }
68 return p;
69}
70
71static inline __be32 *
72nlm_encode_cookie(__be32 *p, struct nlm_cookie *c)
73{
74 *p++ = htonl(c->len);
75 memcpy(p, c->data, c->len);
76 p+=XDR_QUADLEN(c->len);
77 return p;
78}
79
80static __be32 *
81nlm_decode_fh(__be32 *p, struct nfs_fh *f)
82{
83 unsigned int len;
84
85 if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
86 dprintk("lockd: bad fhandle size %d (should be %d)\n",
87 len, NFS2_FHSIZE);
88 return NULL;
89 }
90 f->size = NFS2_FHSIZE;
91 memset(f->data, 0, sizeof(f->data));
92 memcpy(f->data, p, NFS2_FHSIZE);
93 return p + XDR_QUADLEN(NFS2_FHSIZE);
94}
95
96static inline __be32 *
97nlm_encode_fh(__be32 *p, struct nfs_fh *f)
98{
99 *p++ = htonl(NFS2_FHSIZE);
100 memcpy(p, f->data, NFS2_FHSIZE);
101 return p + XDR_QUADLEN(NFS2_FHSIZE);
102}
103
104/*
105 * Encode and decode owner handle
106 */
107static inline __be32 *
108nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
109{
110 return xdr_decode_netobj(p, oh);
111}
112
113static inline __be32 *
114nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
115{
116 return xdr_encode_netobj(p, oh);
117}
118
119static __be32 *
120nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
121{
122 struct file_lock *fl = &lock->fl;
123 s32 start, len, end;
124
125 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
126 &lock->len,
127 NLM_MAXSTRLEN))
128 || !(p = nlm_decode_fh(p, &lock->fh))
129 || !(p = nlm_decode_oh(p, &lock->oh)))
130 return NULL;
131 lock->svid = ntohl(*p++);
132
133 locks_init_lock(fl);
134 fl->fl_owner = current->files;
135 fl->fl_pid = (pid_t)lock->svid;
136 fl->fl_flags = FL_POSIX;
137 fl->fl_type = F_RDLCK; /* as good as anything else */
138 start = ntohl(*p++);
139 len = ntohl(*p++);
140 end = start + len - 1;
141
142 fl->fl_start = s32_to_loff_t(start);
143
144 if (len == 0 || end < 0)
145 fl->fl_end = OFFSET_MAX;
146 else
147 fl->fl_end = s32_to_loff_t(end);
148 return p;
149}
150
151/*
152 * Encode result of a TEST/TEST_MSG call
153 */
154static __be32 *
155nlm_encode_testres(__be32 *p, struct nlm_res *resp)
156{
157 s32 start, len;
158
159 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
160 return NULL;
161 *p++ = resp->status;
162
163 if (resp->status == nlm_lck_denied) {
164 struct file_lock *fl = &resp->lock.fl;
165
166 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
167 *p++ = htonl(resp->lock.svid);
168
169 /* Encode owner handle. */
170 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
171 return NULL;
172
173 start = loff_t_to_s32(fl->fl_start);
174 if (fl->fl_end == OFFSET_MAX)
175 len = 0;
176 else
177 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
178
179 *p++ = htonl(start);
180 *p++ = htonl(len);
181 }
182
183 return p;
184}
185
186
187/*
188 * First, the server side XDR functions
189 */
190int
191nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
192{
193 u32 exclusive;
194
195 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
196 return 0;
197
198 exclusive = ntohl(*p++);
199 if (!(p = nlm_decode_lock(p, &argp->lock)))
200 return 0;
201 if (exclusive)
202 argp->lock.fl.fl_type = F_WRLCK;
203
204 return xdr_argsize_check(rqstp, p);
205}
206
207int
208nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
209{
210 if (!(p = nlm_encode_testres(p, resp)))
211 return 0;
212 return xdr_ressize_check(rqstp, p);
213}
214
215int
216nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
217{
218 u32 exclusive;
219
220 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
221 return 0;
222 argp->block = ntohl(*p++);
223 exclusive = ntohl(*p++);
224 if (!(p = nlm_decode_lock(p, &argp->lock)))
225 return 0;
226 if (exclusive)
227 argp->lock.fl.fl_type = F_WRLCK;
228 argp->reclaim = ntohl(*p++);
229 argp->state = ntohl(*p++);
230 argp->monitor = 1; /* monitor client by default */
231
232 return xdr_argsize_check(rqstp, p);
233}
234
235int
236nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
237{
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, nlm_args *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, nlm_args *argp)
263{
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 = 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, struct nlm_res *resp)
284{
285 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
286 return 0;
287 *p++ = resp->status;
288 *p++ = xdr_zero; /* sequence argument */
289 return xdr_ressize_check(rqstp, p);
290}
291
292int
293nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
294{
295 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
296 return 0;
297 *p++ = resp->status;
298 return xdr_ressize_check(rqstp, p);
299}
300
301int
302nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
303{
304 struct nlm_lock *lock = &argp->lock;
305
306 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
307 &lock->len, NLM_MAXSTRLEN)))
308 return 0;
309 argp->state = ntohl(*p++);
310 return xdr_argsize_check(rqstp, p);
311}
312
313int
314nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
315{
316 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
317 return 0;
318 argp->state = ntohl(*p++);
319 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
320 p += XDR_QUADLEN(SM_PRIV_SIZE);
321 return xdr_argsize_check(rqstp, p);
322}
323
324int
325nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
326{
327 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
328 return 0;
329 resp->status = *p++;
330 return xdr_argsize_check(rqstp, p);
331}
332
333int
334nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
335{
336 return xdr_argsize_check(rqstp, p);
337}
338
339int
340nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
341{
342 return xdr_ressize_check(rqstp, p);
343}
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->fl_flags = FL_POSIX;
92 fl->fl_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->fl_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
148int
149nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
150{
151 return 1;
152}
153
154int
155nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
156{
157 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
158 struct nlm_args *argp = rqstp->rq_argp;
159 u32 exclusive;
160
161 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
162 return 0;
163 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
164 return 0;
165 if (!svcxdr_decode_lock(xdr, &argp->lock))
166 return 0;
167 if (exclusive)
168 argp->lock.fl.fl_type = F_WRLCK;
169
170 return 1;
171}
172
173int
174nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
175{
176 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
177 struct nlm_args *argp = rqstp->rq_argp;
178 u32 exclusive;
179
180 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
181 return 0;
182 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
183 return 0;
184 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
185 return 0;
186 if (!svcxdr_decode_lock(xdr, &argp->lock))
187 return 0;
188 if (exclusive)
189 argp->lock.fl.fl_type = F_WRLCK;
190 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
191 return 0;
192 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
193 return 0;
194 argp->monitor = 1; /* monitor client by default */
195
196 return 1;
197}
198
199int
200nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
201{
202 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
203 struct nlm_args *argp = rqstp->rq_argp;
204 u32 exclusive;
205
206 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
207 return 0;
208 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
209 return 0;
210 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
211 return 0;
212 if (!svcxdr_decode_lock(xdr, &argp->lock))
213 return 0;
214 if (exclusive)
215 argp->lock.fl.fl_type = F_WRLCK;
216
217 return 1;
218}
219
220int
221nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
222{
223 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
224 struct nlm_args *argp = rqstp->rq_argp;
225
226 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
227 return 0;
228 if (!svcxdr_decode_lock(xdr, &argp->lock))
229 return 0;
230 argp->lock.fl.fl_type = F_UNLCK;
231
232 return 1;
233}
234
235int
236nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
237{
238 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
239 struct nlm_res *resp = rqstp->rq_argp;
240
241 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
242 return 0;
243 if (!svcxdr_decode_stats(xdr, &resp->status))
244 return 0;
245
246 return 1;
247}
248
249int
250nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
251{
252 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
253 struct nlm_reboot *argp = rqstp->rq_argp;
254 u32 len;
255
256 if (xdr_stream_decode_u32(xdr, &len) < 0)
257 return 0;
258 if (len > SM_MAXSTRLEN)
259 return 0;
260 p = xdr_inline_decode(xdr, len);
261 if (!p)
262 return 0;
263 argp->len = len;
264 argp->mon = (char *)p;
265 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
266 return 0;
267 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
268 if (!p)
269 return 0;
270 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
271
272 return 1;
273}
274
275int
276nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
277{
278 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
279 struct nlm_args *argp = rqstp->rq_argp;
280 struct nlm_lock *lock = &argp->lock;
281
282 memset(lock, 0, sizeof(*lock));
283 locks_init_lock(&lock->fl);
284 lock->svid = ~(u32)0;
285
286 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
287 return 0;
288 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
289 return 0;
290 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
291 return 0;
292 if (!svcxdr_decode_owner(xdr, &lock->oh))
293 return 0;
294 /* XXX: Range checks are missing in the original code */
295 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
296 return 0;
297 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
298 return 0;
299
300 return 1;
301}
302
303int
304nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
305{
306 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
307 struct nlm_args *argp = rqstp->rq_argp;
308 struct nlm_lock *lock = &argp->lock;
309
310 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
311 return 0;
312 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
313 return 0;
314
315 return 1;
316}
317
318
319/*
320 * Encode Reply results
321 */
322
323int
324nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
325{
326 return 1;
327}
328
329int
330nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
331{
332 struct xdr_stream *xdr = &rqstp->rq_res_stream;
333 struct nlm_res *resp = rqstp->rq_resp;
334
335 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
336 svcxdr_encode_testrply(xdr, resp);
337}
338
339int
340nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
341{
342 struct xdr_stream *xdr = &rqstp->rq_res_stream;
343 struct nlm_res *resp = rqstp->rq_resp;
344
345 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
346 svcxdr_encode_stats(xdr, resp->status);
347}
348
349int
350nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
351{
352 struct xdr_stream *xdr = &rqstp->rq_res_stream;
353 struct nlm_res *resp = rqstp->rq_resp;
354
355 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
356 return 0;
357 if (!svcxdr_encode_stats(xdr, resp->status))
358 return 0;
359 /* sequence */
360 if (xdr_stream_encode_u32(xdr, 0) < 0)
361 return 0;
362
363 return 1;
364}