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
23 static inline loff_t
s64_to_loff_t(__s64 offset)24 s64_to_loff_t(__s64 offset)
25 {
26 return (loff_t)offset;
27 }
28
29
30 static inline s64
loff_t_to_s64(loff_t offset)31 loff_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 */
46 static __be32 *
nlm4_decode_cookie(__be32 * p,struct nlm_cookie * c)47 nlm4_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
74 static __be32 *
nlm4_encode_cookie(__be32 * p,struct nlm_cookie * c)75 nlm4_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
83 static __be32 *
nlm4_decode_fh(__be32 * p,struct nfs_fh * f)84 nlm4_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 */
100 static __be32 *
nlm4_decode_oh(__be32 * p,struct xdr_netobj * oh)101 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
102 {
103 return xdr_decode_netobj(p, oh);
104 }
105
106 static __be32 *
nlm4_decode_lock(__be32 * p,struct nlm_lock * lock)107 nlm4_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 */
141 static __be32 *
nlm4_encode_testres(__be32 * p,struct nlm_res * resp)142 nlm4_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 */
182 int
nlm4svc_decode_testargs(struct svc_rqst * rqstp,__be32 * p)183 nlm4svc_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
200 int
nlm4svc_encode_testres(struct svc_rqst * rqstp,__be32 * p)201 nlm4svc_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
210 int
nlm4svc_decode_lockargs(struct svc_rqst * rqstp,__be32 * p)211 nlm4svc_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
231 int
nlm4svc_decode_cancargs(struct svc_rqst * rqstp,__be32 * p)232 nlm4svc_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
248 int
nlm4svc_decode_unlockargs(struct svc_rqst * rqstp,__be32 * p)249 nlm4svc_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
260 int
nlm4svc_decode_shareargs(struct svc_rqst * rqstp,__be32 * p)261 nlm4svc_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
282 int
nlm4svc_encode_shareres(struct svc_rqst * rqstp,__be32 * p)283 nlm4svc_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
294 int
nlm4svc_encode_res(struct svc_rqst * rqstp,__be32 * p)295 nlm4svc_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
305 int
nlm4svc_decode_notify(struct svc_rqst * rqstp,__be32 * p)306 nlm4svc_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
318 int
nlm4svc_decode_reboot(struct svc_rqst * rqstp,__be32 * p)319 nlm4svc_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
331 int
nlm4svc_decode_res(struct svc_rqst * rqstp,__be32 * p)332 nlm4svc_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
342 int
nlm4svc_decode_void(struct svc_rqst * rqstp,__be32 * p)343 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
344 {
345 return xdr_argsize_check(rqstp, p);
346 }
347
348 int
nlm4svc_encode_void(struct svc_rqst * rqstp,__be32 * p)349 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
350 {
351 return xdr_ressize_check(rqstp, p);
352 }
353