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Linux/fs/lockd/xdr.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/fs/lockd/xdr.c
  4  *
  5  * XDR support for lockd and the lock client.
  6  *
  7  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
  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 #include <uapi/linux/nfs2.h>
 21 
 22 #define NLMDBG_FACILITY         NLMDBG_XDR
 23 
 24 
 25 static inline loff_t
 26 s32_to_loff_t(__s32 offset)
 27 {
 28         return (loff_t)offset;
 29 }
 30 
 31 static inline __s32
 32 loff_t_to_s32(loff_t offset)
 33 {
 34         __s32 res;
 35         if (offset >= NLM_OFFSET_MAX)
 36                 res = NLM_OFFSET_MAX;
 37         else if (offset <= -NLM_OFFSET_MAX)
 38                 res = -NLM_OFFSET_MAX;
 39         else
 40                 res = offset;
 41         return res;
 42 }
 43 
 44 /*
 45  * XDR functions for basic NLM types
 46  */
 47 static __be32 *nlm_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 inline __be32 *
 75 nlm_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 *
 84 nlm_decode_fh(__be32 *p, struct nfs_fh *f)
 85 {
 86         unsigned int    len;
 87 
 88         if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
 89                 dprintk("lockd: bad fhandle size %d (should be %d)\n",
 90                         len, NFS2_FHSIZE);
 91                 return NULL;
 92         }
 93         f->size = NFS2_FHSIZE;
 94         memset(f->data, 0, sizeof(f->data));
 95         memcpy(f->data, p, NFS2_FHSIZE);
 96         return p + XDR_QUADLEN(NFS2_FHSIZE);
 97 }
 98 
 99 /*
100  * Encode and decode owner handle
101  */
102 static inline __be32 *
103 nlm_decode_oh(__be32 *p, struct xdr_netobj *oh)
104 {
105         return xdr_decode_netobj(p, oh);
106 }
107 
108 static inline __be32 *
109 nlm_encode_oh(__be32 *p, struct xdr_netobj *oh)
110 {
111         return xdr_encode_netobj(p, oh);
112 }
113 
114 static __be32 *
115 nlm_decode_lock(__be32 *p, struct nlm_lock *lock)
116 {
117         struct file_lock        *fl = &lock->fl;
118         s32                     start, len, end;
119 
120         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
121                                             &lock->len,
122                                             NLM_MAXSTRLEN))
123          || !(p = nlm_decode_fh(p, &lock->fh))
124          || !(p = nlm_decode_oh(p, &lock->oh)))
125                 return NULL;
126         lock->svid  = ntohl(*p++);
127 
128         locks_init_lock(fl);
129         fl->fl_flags = FL_POSIX;
130         fl->fl_type  = F_RDLCK;         /* as good as anything else */
131         start = ntohl(*p++);
132         len = ntohl(*p++);
133         end = start + len - 1;
134 
135         fl->fl_start = s32_to_loff_t(start);
136 
137         if (len == 0 || end < 0)
138                 fl->fl_end = OFFSET_MAX;
139         else
140                 fl->fl_end = s32_to_loff_t(end);
141         return p;
142 }
143 
144 /*
145  * Encode result of a TEST/TEST_MSG call
146  */
147 static __be32 *
148 nlm_encode_testres(__be32 *p, struct nlm_res *resp)
149 {
150         s32             start, len;
151 
152         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
153                 return NULL;
154         *p++ = resp->status;
155 
156         if (resp->status == nlm_lck_denied) {
157                 struct file_lock        *fl = &resp->lock.fl;
158 
159                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
160                 *p++ = htonl(resp->lock.svid);
161 
162                 /* Encode owner handle. */
163                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
164                         return NULL;
165 
166                 start = loff_t_to_s32(fl->fl_start);
167                 if (fl->fl_end == OFFSET_MAX)
168                         len = 0;
169                 else
170                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
171 
172                 *p++ = htonl(start);
173                 *p++ = htonl(len);
174         }
175 
176         return p;
177 }
178 
179 
180 /*
181  * First, the server side XDR functions
182  */
183 int
184 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
185 {
186         struct nlm_args *argp = rqstp->rq_argp;
187         u32     exclusive;
188 
189         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
190                 return 0;
191 
192         exclusive = ntohl(*p++);
193         if (!(p = nlm_decode_lock(p, &argp->lock)))
194                 return 0;
195         if (exclusive)
196                 argp->lock.fl.fl_type = F_WRLCK;
197 
198         return xdr_argsize_check(rqstp, p);
199 }
200 
201 int
202 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
203 {
204         struct nlm_res *resp = rqstp->rq_resp;
205 
206         if (!(p = nlm_encode_testres(p, resp)))
207                 return 0;
208         return xdr_ressize_check(rqstp, p);
209 }
210 
211 int
212 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
213 {
214         struct nlm_args *argp = rqstp->rq_argp;
215         u32     exclusive;
216 
217         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
218                 return 0;
219         argp->block  = ntohl(*p++);
220         exclusive    = ntohl(*p++);
221         if (!(p = nlm_decode_lock(p, &argp->lock)))
222                 return 0;
223         if (exclusive)
224                 argp->lock.fl.fl_type = F_WRLCK;
225         argp->reclaim = ntohl(*p++);
226         argp->state   = ntohl(*p++);
227         argp->monitor = 1;              /* monitor client by default */
228 
229         return xdr_argsize_check(rqstp, p);
230 }
231 
232 int
233 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
234 {
235         struct nlm_args *argp = rqstp->rq_argp;
236         u32     exclusive;
237 
238         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
239                 return 0;
240         argp->block = ntohl(*p++);
241         exclusive = ntohl(*p++);
242         if (!(p = nlm_decode_lock(p, &argp->lock)))
243                 return 0;
244         if (exclusive)
245                 argp->lock.fl.fl_type = F_WRLCK;
246         return xdr_argsize_check(rqstp, p);
247 }
248 
249 int
250 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
251 {
252         struct nlm_args *argp = rqstp->rq_argp;
253 
254         if (!(p = nlm_decode_cookie(p, &argp->cookie))
255          || !(p = nlm_decode_lock(p, &argp->lock)))
256                 return 0;
257         argp->lock.fl.fl_type = F_UNLCK;
258         return xdr_argsize_check(rqstp, p);
259 }
260 
261 int
262 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
263 {
264         struct nlm_args *argp = rqstp->rq_argp;
265         struct nlm_lock *lock = &argp->lock;
266 
267         memset(lock, 0, sizeof(*lock));
268         locks_init_lock(&lock->fl);
269         lock->svid = ~(u32) 0;
270 
271         if (!(p = nlm_decode_cookie(p, &argp->cookie))
272          || !(p = xdr_decode_string_inplace(p, &lock->caller,
273                                             &lock->len, NLM_MAXSTRLEN))
274          || !(p = nlm_decode_fh(p, &lock->fh))
275          || !(p = nlm_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
283 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
284 {
285         struct nlm_res *resp = rqstp->rq_resp;
286 
287         if (!(p = nlm_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
295 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
296 {
297         struct nlm_res *resp = rqstp->rq_resp;
298 
299         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
300                 return 0;
301         *p++ = resp->status;
302         return xdr_ressize_check(rqstp, p);
303 }
304 
305 int
306 nlmsvc_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
319 nlmsvc_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
332 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
333 {
334         struct nlm_res *resp = rqstp->rq_argp;
335 
336         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
337                 return 0;
338         resp->status = *p++;
339         return xdr_argsize_check(rqstp, p);
340 }
341 
342 int
343 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
344 {
345         return xdr_argsize_check(rqstp, p);
346 }
347 
348 int
349 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
350 {
351         return xdr_ressize_check(rqstp, p);
352 }
353 

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