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Linux/fs/lockd/xdr4.c

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  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
 24 s64_to_loff_t(__s64 offset)
 25 {
 26         return (loff_t)offset;
 27 }
 28 
 29 
 30 static inline s64
 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 *
 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 *
 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 *
 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 *
101 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
102 {
103         return xdr_decode_netobj(p, oh);
104 }
105 
106 static __be32 *
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   = current->tgid;
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 *
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
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
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
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
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
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
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 = current->tgid;
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
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
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
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
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
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
343 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p)
344 {
345         return xdr_argsize_check(rqstp, p);
346 }
347 
348 int
349 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p)
350 {
351         return xdr_ressize_check(rqstp, p);
352 }
353 

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