Loading...
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}
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}