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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#include "svcxdr.h"
22
23static inline s64
24loff_t_to_s64(loff_t offset)
25{
26 s64 res;
27 if (offset > NLM4_OFFSET_MAX)
28 res = NLM4_OFFSET_MAX;
29 else if (offset < -NLM4_OFFSET_MAX)
30 res = -NLM4_OFFSET_MAX;
31 else
32 res = offset;
33 return res;
34}
35
36void nlm4svc_set_file_lock_range(struct file_lock *fl, u64 off, u64 len)
37{
38 s64 end = off + len - 1;
39
40 fl->fl_start = off;
41 if (len == 0 || end < 0)
42 fl->fl_end = OFFSET_MAX;
43 else
44 fl->fl_end = end;
45}
46
47/*
48 * NLM file handles are defined by specification to be a variable-length
49 * XDR opaque no longer than 1024 bytes. However, this implementation
50 * limits their length to the size of an NFSv3 file handle.
51 */
52static bool
53svcxdr_decode_fhandle(struct xdr_stream *xdr, struct nfs_fh *fh)
54{
55 __be32 *p;
56 u32 len;
57
58 if (xdr_stream_decode_u32(xdr, &len) < 0)
59 return false;
60 if (len > NFS_MAXFHSIZE)
61 return false;
62
63 p = xdr_inline_decode(xdr, len);
64 if (!p)
65 return false;
66 fh->size = len;
67 memcpy(fh->data, p, len);
68 memset(fh->data + len, 0, sizeof(fh->data) - len);
69
70 return true;
71}
72
73static bool
74svcxdr_decode_lock(struct xdr_stream *xdr, struct nlm_lock *lock)
75{
76 struct file_lock *fl = &lock->fl;
77
78 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
79 return false;
80 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
81 return false;
82 if (!svcxdr_decode_owner(xdr, &lock->oh))
83 return false;
84 if (xdr_stream_decode_u32(xdr, &lock->svid) < 0)
85 return false;
86 if (xdr_stream_decode_u64(xdr, &lock->lock_start) < 0)
87 return false;
88 if (xdr_stream_decode_u64(xdr, &lock->lock_len) < 0)
89 return false;
90
91 locks_init_lock(fl);
92 fl->fl_flags = FL_POSIX;
93 fl->fl_type = F_RDLCK;
94 nlm4svc_set_file_lock_range(fl, lock->lock_start, lock->lock_len);
95 return true;
96}
97
98static bool
99svcxdr_encode_holder(struct xdr_stream *xdr, const struct nlm_lock *lock)
100{
101 const struct file_lock *fl = &lock->fl;
102 s64 start, len;
103
104 /* exclusive */
105 if (xdr_stream_encode_bool(xdr, fl->fl_type != F_RDLCK) < 0)
106 return false;
107 if (xdr_stream_encode_u32(xdr, lock->svid) < 0)
108 return false;
109 if (!svcxdr_encode_owner(xdr, &lock->oh))
110 return false;
111 start = loff_t_to_s64(fl->fl_start);
112 if (fl->fl_end == OFFSET_MAX)
113 len = 0;
114 else
115 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
116 if (xdr_stream_encode_u64(xdr, start) < 0)
117 return false;
118 if (xdr_stream_encode_u64(xdr, len) < 0)
119 return false;
120
121 return true;
122}
123
124static bool
125svcxdr_encode_testrply(struct xdr_stream *xdr, const struct nlm_res *resp)
126{
127 if (!svcxdr_encode_stats(xdr, resp->status))
128 return false;
129 switch (resp->status) {
130 case nlm_lck_denied:
131 if (!svcxdr_encode_holder(xdr, &resp->lock))
132 return false;
133 }
134
135 return true;
136}
137
138
139/*
140 * Decode Call arguments
141 */
142
143bool
144nlm4svc_decode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
145{
146 return true;
147}
148
149bool
150nlm4svc_decode_testargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
151{
152 struct nlm_args *argp = rqstp->rq_argp;
153 u32 exclusive;
154
155 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
156 return false;
157 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
158 return false;
159 if (!svcxdr_decode_lock(xdr, &argp->lock))
160 return false;
161 if (exclusive)
162 argp->lock.fl.fl_type = F_WRLCK;
163
164 return true;
165}
166
167bool
168nlm4svc_decode_lockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
169{
170 struct nlm_args *argp = rqstp->rq_argp;
171 u32 exclusive;
172
173 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
174 return false;
175 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
176 return false;
177 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
178 return false;
179 if (!svcxdr_decode_lock(xdr, &argp->lock))
180 return false;
181 if (exclusive)
182 argp->lock.fl.fl_type = F_WRLCK;
183 if (xdr_stream_decode_bool(xdr, &argp->reclaim) < 0)
184 return false;
185 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
186 return false;
187 argp->monitor = 1; /* monitor client by default */
188
189 return true;
190}
191
192bool
193nlm4svc_decode_cancargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
194{
195 struct nlm_args *argp = rqstp->rq_argp;
196 u32 exclusive;
197
198 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
199 return false;
200 if (xdr_stream_decode_bool(xdr, &argp->block) < 0)
201 return false;
202 if (xdr_stream_decode_bool(xdr, &exclusive) < 0)
203 return false;
204 if (!svcxdr_decode_lock(xdr, &argp->lock))
205 return false;
206 if (exclusive)
207 argp->lock.fl.fl_type = F_WRLCK;
208
209 return true;
210}
211
212bool
213nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
214{
215 struct nlm_args *argp = rqstp->rq_argp;
216
217 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
218 return false;
219 if (!svcxdr_decode_lock(xdr, &argp->lock))
220 return false;
221 argp->lock.fl.fl_type = F_UNLCK;
222
223 return true;
224}
225
226bool
227nlm4svc_decode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
228{
229 struct nlm_res *resp = rqstp->rq_argp;
230
231 if (!svcxdr_decode_cookie(xdr, &resp->cookie))
232 return false;
233 if (!svcxdr_decode_stats(xdr, &resp->status))
234 return false;
235
236 return true;
237}
238
239bool
240nlm4svc_decode_reboot(struct svc_rqst *rqstp, struct xdr_stream *xdr)
241{
242 struct nlm_reboot *argp = rqstp->rq_argp;
243 __be32 *p;
244 u32 len;
245
246 if (xdr_stream_decode_u32(xdr, &len) < 0)
247 return false;
248 if (len > SM_MAXSTRLEN)
249 return false;
250 p = xdr_inline_decode(xdr, len);
251 if (!p)
252 return false;
253 argp->len = len;
254 argp->mon = (char *)p;
255 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
256 return false;
257 p = xdr_inline_decode(xdr, SM_PRIV_SIZE);
258 if (!p)
259 return false;
260 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
261
262 return true;
263}
264
265bool
266nlm4svc_decode_shareargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
267{
268 struct nlm_args *argp = rqstp->rq_argp;
269 struct nlm_lock *lock = &argp->lock;
270
271 memset(lock, 0, sizeof(*lock));
272 locks_init_lock(&lock->fl);
273 lock->svid = ~(u32)0;
274
275 if (!svcxdr_decode_cookie(xdr, &argp->cookie))
276 return false;
277 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
278 return false;
279 if (!svcxdr_decode_fhandle(xdr, &lock->fh))
280 return false;
281 if (!svcxdr_decode_owner(xdr, &lock->oh))
282 return false;
283 /* XXX: Range checks are missing in the original code */
284 if (xdr_stream_decode_u32(xdr, &argp->fsm_mode) < 0)
285 return false;
286 if (xdr_stream_decode_u32(xdr, &argp->fsm_access) < 0)
287 return false;
288
289 return true;
290}
291
292bool
293nlm4svc_decode_notify(struct svc_rqst *rqstp, struct xdr_stream *xdr)
294{
295 struct nlm_args *argp = rqstp->rq_argp;
296 struct nlm_lock *lock = &argp->lock;
297
298 if (!svcxdr_decode_string(xdr, &lock->caller, &lock->len))
299 return false;
300 if (xdr_stream_decode_u32(xdr, &argp->state) < 0)
301 return false;
302
303 return true;
304}
305
306
307/*
308 * Encode Reply results
309 */
310
311bool
312nlm4svc_encode_void(struct svc_rqst *rqstp, struct xdr_stream *xdr)
313{
314 return true;
315}
316
317bool
318nlm4svc_encode_testres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
319{
320 struct nlm_res *resp = rqstp->rq_resp;
321
322 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
323 svcxdr_encode_testrply(xdr, resp);
324}
325
326bool
327nlm4svc_encode_res(struct svc_rqst *rqstp, struct xdr_stream *xdr)
328{
329 struct nlm_res *resp = rqstp->rq_resp;
330
331 return svcxdr_encode_cookie(xdr, &resp->cookie) &&
332 svcxdr_encode_stats(xdr, resp->status);
333}
334
335bool
336nlm4svc_encode_shareres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
337{
338 struct nlm_res *resp = rqstp->rq_resp;
339
340 if (!svcxdr_encode_cookie(xdr, &resp->cookie))
341 return false;
342 if (!svcxdr_encode_stats(xdr, resp->status))
343 return false;
344 /* sequence */
345 if (xdr_stream_encode_u32(xdr, 0) < 0)
346 return false;
347
348 return true;
349}