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b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT
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>
1da177e4
LT
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>
1da177e4
LT
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 */
52921e02
AV
46static __be32 *
47nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
1da177e4
LT
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 {
e159a08b
CL
66 dprintk("lockd: bad cookie size %d (only cookies under "
67 "%d bytes are supported.)\n",
68 len, NLM_MAXCOOKIELEN);
1da177e4
LT
69 return NULL;
70 }
71 return p;
72}
73
52921e02
AV
74static __be32 *
75nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
1da177e4
LT
76{
77 *p++ = htonl(c->len);
78 memcpy(p, c->data, c->len);
79 p+=XDR_QUADLEN(c->len);
80 return p;
81}
82
52921e02
AV
83static __be32 *
84nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
1da177e4
LT
85{
86 memset(f->data, 0, sizeof(f->data));
87 f->size = ntohl(*p++);
88 if (f->size > NFS_MAXFHSIZE) {
e159a08b 89 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
1da177e4
LT
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
1da177e4
LT
97/*
98 * Encode and decode owner handle
99 */
52921e02
AV
100static __be32 *
101nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
1da177e4
LT
102{
103 return xdr_decode_netobj(p, oh);
104}
105
52921e02
AV
106static __be32 *
107nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
1da177e4
LT
108{
109 struct file_lock *fl = &lock->fl;
d48c5f41
TM
110 __u64 len, start;
111 __s64 end;
1da177e4
LT
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;
7bab377f 118 lock->svid = ntohl(*p++);
1da177e4
LT
119
120 locks_init_lock(fl);
1da177e4
LT
121 fl->fl_flags = FL_POSIX;
122 fl->fl_type = F_RDLCK; /* as good as anything else */
123 p = xdr_decode_hyper(p, &start);
124 p = xdr_decode_hyper(p, &len);
125 end = start + len - 1;
126
127 fl->fl_start = s64_to_loff_t(start);
128
129 if (len == 0 || end < 0)
130 fl->fl_end = OFFSET_MAX;
131 else
132 fl->fl_end = s64_to_loff_t(end);
133 return p;
134}
135
1da177e4
LT
136/*
137 * Encode result of a TEST/TEST_MSG call
138 */
52921e02
AV
139static __be32 *
140nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
1da177e4
LT
141{
142 s64 start, len;
143
144 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
145 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
146 return NULL;
147 *p++ = resp->status;
148
149 if (resp->status == nlm_lck_denied) {
150 struct file_lock *fl = &resp->lock.fl;
151
152 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
7bab377f 153 *p++ = htonl(resp->lock.svid);
1da177e4
LT
154
155 /* Encode owner handle. */
156 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
157 return NULL;
158
159 start = loff_t_to_s64(fl->fl_start);
160 if (fl->fl_end == OFFSET_MAX)
161 len = 0;
162 else
163 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
164
165 p = xdr_encode_hyper(p, start);
166 p = xdr_encode_hyper(p, len);
7bab377f
TM
167 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
168 resp->status, (int)resp->lock.svid, fl->fl_type,
1da177e4
LT
169 (long long)fl->fl_start, (long long)fl->fl_end);
170 }
171
172 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
173 return p;
174}
175
176
177/*
178 * First, the server side XDR functions
179 */
180int
026fec7e 181nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 182{
026fec7e 183 struct nlm_args *argp = rqstp->rq_argp;
1da177e4
LT
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
63f8de37 199nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
1da177e4 200{
63f8de37
CH
201 struct nlm_res *resp = rqstp->rq_resp;
202
1da177e4
LT
203 if (!(p = nlm4_encode_testres(p, resp)))
204 return 0;
205 return xdr_ressize_check(rqstp, p);
206}
207
208int
026fec7e 209nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 210{
026fec7e 211 struct nlm_args *argp = rqstp->rq_argp;
1da177e4
LT
212 u32 exclusive;
213
214 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
215 return 0;
216 argp->block = ntohl(*p++);
217 exclusive = ntohl(*p++);
218 if (!(p = nlm4_decode_lock(p, &argp->lock)))
219 return 0;
220 if (exclusive)
221 argp->lock.fl.fl_type = F_WRLCK;
222 argp->reclaim = ntohl(*p++);
223 argp->state = ntohl(*p++);
224 argp->monitor = 1; /* monitor client by default */
225
226 return xdr_argsize_check(rqstp, p);
227}
228
229int
026fec7e 230nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 231{
026fec7e 232 struct nlm_args *argp = rqstp->rq_argp;
1da177e4
LT
233 u32 exclusive;
234
235 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
236 return 0;
237 argp->block = ntohl(*p++);
238 exclusive = ntohl(*p++);
239 if (!(p = nlm4_decode_lock(p, &argp->lock)))
240 return 0;
241 if (exclusive)
242 argp->lock.fl.fl_type = F_WRLCK;
243 return xdr_argsize_check(rqstp, p);
244}
245
246int
026fec7e 247nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 248{
026fec7e
CH
249 struct nlm_args *argp = rqstp->rq_argp;
250
1da177e4
LT
251 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
252 || !(p = nlm4_decode_lock(p, &argp->lock)))
253 return 0;
254 argp->lock.fl.fl_type = F_UNLCK;
255 return xdr_argsize_check(rqstp, p);
256}
257
258int
026fec7e 259nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
1da177e4 260{
026fec7e 261 struct nlm_args *argp = rqstp->rq_argp;
1da177e4
LT
262 struct nlm_lock *lock = &argp->lock;
263
264 memset(lock, 0, sizeof(*lock));
265 locks_init_lock(&lock->fl);
7bab377f 266 lock->svid = ~(u32) 0;
1da177e4
LT
267
268 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
269 || !(p = xdr_decode_string_inplace(p, &lock->caller,
270 &lock->len, NLM_MAXSTRLEN))
271 || !(p = nlm4_decode_fh(p, &lock->fh))
272 || !(p = nlm4_decode_oh(p, &lock->oh)))
273 return 0;
274 argp->fsm_mode = ntohl(*p++);
275 argp->fsm_access = ntohl(*p++);
276 return xdr_argsize_check(rqstp, p);
277}
278
279int
63f8de37 280nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
1da177e4 281{
63f8de37
CH
282 struct nlm_res *resp = rqstp->rq_resp;
283
1da177e4
LT
284 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
285 return 0;
286 *p++ = resp->status;
287 *p++ = xdr_zero; /* sequence argument */
288 return xdr_ressize_check(rqstp, p);
289}
290
291int
63f8de37 292nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p)
1da177e4 293{
63f8de37
CH
294 struct nlm_res *resp = rqstp->rq_resp;
295
1da177e4
LT
296 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
297 return 0;
298 *p++ = resp->status;
299 return xdr_ressize_check(rqstp, p);
300}
301
302int
026fec7e 303nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
1da177e4 304{
026fec7e 305 struct nlm_args *argp = rqstp->rq_argp;
1da177e4
LT
306 struct nlm_lock *lock = &argp->lock;
307
308 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
309 &lock->len, NLM_MAXSTRLEN)))
310 return 0;
311 argp->state = ntohl(*p++);
312 return xdr_argsize_check(rqstp, p);
313}
314
315int
026fec7e 316nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
1da177e4 317{
026fec7e
CH
318 struct nlm_reboot *argp = rqstp->rq_argp;
319
1da177e4
LT
320 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
321 return 0;
322 argp->state = ntohl(*p++);
576df463
CL
323 memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
324 p += XDR_QUADLEN(SM_PRIV_SIZE);
1da177e4
LT
325 return xdr_argsize_check(rqstp, p);
326}
327
328int
026fec7e 329nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p)
1da177e4 330{
026fec7e
CH
331 struct nlm_res *resp = rqstp->rq_argp;
332
1da177e4
LT
333 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
334 return 0;
e8c5c045 335 resp->status = *p++;
1da177e4
LT
336 return xdr_argsize_check(rqstp, p);
337}
338
339int
026fec7e 340nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
1da177e4
LT
341{
342 return xdr_argsize_check(rqstp, p);
343}
344
345int
63f8de37 346nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
1da177e4
LT
347{
348 return xdr_ressize_check(rqstp, p);
349}