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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}
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#include "svcxdr.h"
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 * NLM file handles are defined by specification to be a variable-length
45 * XDR opaque no longer than 1024 bytes. However, this implementation
46 * limits their length to the size of an NFSv3 file handle.
47 */
48static bool
49svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
50{
51 __be32 *p;
52 u32 len;
53
54 if (xdr_stream_decode_u32(xdr, &len) < 0)
55 return false;
56 if (len > NFS_MAXFHSIZE)
57 return false;
58
59 p = xdr_inline_decode(xdr, len);
60 if (!p)
61 return false;
62 fh->size = len;
63 memcpy(fh->data, p, len);
64 memset(fh->data + len, 0, sizeof(fh->data) - len);
65
66 return true;
67}
68
69static bool
70svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
71{
72 struct file_lock *fl = &lock->fl;
73 u64 len, start;
74 s64 end;
75
76 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
77 return false;
78 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
79 return false;
80 if (!svcxdr_decode_owner(xdr, &lock->oh))
81 return false;
82 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
83 return false;
84 if (xdr_stream_decode_u64(xdr, &start) < 0)
85 return false;
86 if (xdr_stream_decode_u64(xdr, &len) < 0)
87 return false;
88
89 locks_init_lock(fl);
90 fl->fl_flags = FL_POSIX;
91 fl->fl_type = F_RDLCK;
92 end = start + len - 1;
93 fl->fl_start = s64_to_loff_t(start);
94 if (len == 0 || end < 0)
95 fl->fl_end = OFFSET_MAX;
96 else
97 fl->fl_end = s64_to_loff_t(end);
98
99 return true;
100}
101
102static bool
103svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
104{
105 const struct file_lock *fl = &lock->fl;
106 s64 start, len;
107
108 /* exclusive */
109 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
110 return false;
111 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
112 return false;
113 if (!svcxdr_encode_owner(xdr, &lock->oh))
114 return false;
115 start = loff_t_to_s64(fl->fl_start);
116 if (fl->fl_end == OFFSET_MAX)
117 len = 0;
118 else
119 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
120 if (xdr_stream_encode_u64(xdr, start) < 0)
121 return false;
122 if (xdr_stream_encode_u64(xdr, len) < 0)
123 return false;
124
125 return true;
126}
127
128static bool
129svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
130{
131 if (!svcxdr_encode_stats(xdr, resp->status))
132 return false;
133 switch (resp->status) {
134 case nlm_lck_denied:
135 if (!svcxdr_encode_holder(xdr, &resp->lock))
136 return false;
137 }
138
139 return true;
140}
141
142
143/*
144 * Decode Call arguments
145 */
146
147int
148nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
149{
150 return 1;
151}
152
153int
154nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
155{
156 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
157 struct nlm_args *argp = rqstp->rq_argp;
158 u32 exclusive;
159
160 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
161 return 0;
162 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
163 return 0;
164 if (!svcxdr_decode_lock(xdr, &argp->lock))
165 return 0;
166 if (exclusive)
167 argp->lock.fl.fl_type = F_WRLCK;
168
169 return 1;
170}
171
172int
173nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
174{
175 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
176 struct nlm_args *argp = rqstp->rq_argp;
177 u32 exclusive;
178
179 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
180 return 0;
181 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
182 return 0;
183 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
184 return 0;
185 if (!svcxdr_decode_lock(xdr, &argp->lock))
186 return 0;
187 if (exclusive)
188 argp->lock.fl.fl_type = F_WRLCK;
189 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
190 return 0;
191 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
192 return 0;
193 argp->monitor = 1; /* monitor client by default */
194
195 return 1;
196}
197
198int
199nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
200{
201 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
202 struct nlm_args *argp = rqstp->rq_argp;
203 u32 exclusive;
204
205 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
206 return 0;
207 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
208 return 0;
209 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
210 return 0;
211 if (!svcxdr_decode_lock(xdr, &argp->lock))
212 return 0;
213 if (exclusive)
214 argp->lock.fl.fl_type = F_WRLCK;
215 return 1;
216}
217
218int
219nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
220{
221 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
222 struct nlm_args *argp = rqstp->rq_argp;
223
224 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
225 return 0;
226 if (!svcxdr_decode_lock(xdr, &argp->lock))
227 return 0;
228 argp->lock.fl.fl_type = F_UNLCK;
229
230 return 1;
231}
232
233int
234nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
235{
236 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
237 struct nlm_res *resp = rqstp->rq_argp;
238
239 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
240 return 0;
241 if (!svcxdr_decode_stats(xdr, &resp->status))
242 return 0;
243
244 return 1;
245}
246
247int
248nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
249{
250 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
251 struct nlm_reboot *argp = rqstp->rq_argp;
252 u32 len;
253
254 if (xdr_stream_decode_u32(xdr, &len) < 0)
255 return 0;
256 if (len > SM_MAXSTRLEN)
257 return 0;
258 p = xdr_inline_decode(xdr, len);
259 if (!p)
260 return 0;
261 argp->len = len;
262 argp->mon = (char *)p;
263 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
264 return 0;
265 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
266 if (!p)
267 return 0;
268 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
269
270 return 1;
271}
272
273int
274nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
275{
276 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
277 struct nlm_args *argp = rqstp->rq_argp;
278 struct nlm_lock *lock = &argp->lock;
279
280 memset(lock, 0, sizeof(*lock));
281 locks_init_lock(&lock->fl);
282 lock->svid = ~(u32)0;
283
284 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
285 return 0;
286 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
287 return 0;
288 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
289 return 0;
290 if (!svcxdr_decode_owner(xdr, &lock->oh))
291 return 0;
292 /* XXX: Range checks are missing in the original code */
293 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
294 return 0;
295 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
296 return 0;
297
298 return 1;
299}
300
301int
302nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
303{
304 struct xdr_stream *xdr = &rqstp->rq_arg_stream;
305 struct nlm_args *argp = rqstp->rq_argp;
306 struct nlm_lock *lock = &argp->lock;
307
308 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
309 return 0;
310 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
311 return 0;
312
313 return 1;
314}
315
316
317/*
318 * Encode Reply results
319 */
320
321int
322nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
323{
324 return 1;
325}
326
327int
328nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
329{
330 struct xdr_stream *xdr = &rqstp->rq_res_stream;
331 struct nlm_res *resp = rqstp->rq_resp;
332
333 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
334 svcxdr_encode_testrply(xdr, resp);
335}
336
337int
338nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
339{
340 struct xdr_stream *xdr = &rqstp->rq_res_stream;
341 struct nlm_res *resp = rqstp->rq_resp;
342
343 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
344 svcxdr_encode_stats(xdr, resp->status);
345}
346
347int
348nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
349{
350 struct xdr_stream *xdr = &rqstp->rq_res_stream;
351 struct nlm_res *resp = rqstp->rq_resp;
352
353 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
354 return 0;
355 if (!svcxdr_encode_stats(xdr, resp->status))
356 return 0;
357 /* sequence */
358 if (xdr_stream_encode_u32(xdr, 0) < 0)
359 return 0;
360
361 return 1;
362}