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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_owner = current->files;
130         fl->fl_pid   = current->tgid;
131         fl->fl_flags = FL_POSIX;
132         fl->fl_type  = F_RDLCK;         /* as good as anything else */
133         start = ntohl(*p++);
134         len = ntohl(*p++);
135         end = start + len - 1;
136 
137         fl->fl_start = s32_to_loff_t(start);
138 
139         if (len == 0 || end < 0)
140                 fl->fl_end = OFFSET_MAX;
141         else
142                 fl->fl_end = s32_to_loff_t(end);
143         return p;
144 }
145 
146 /*
147  * Encode result of a TEST/TEST_MSG call
148  */
149 static __be32 *
150 nlm_encode_testres(__be32 *p, struct nlm_res *resp)
151 {
152         s32             start, len;
153 
154         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
155                 return NULL;
156         *p++ = resp->status;
157 
158         if (resp->status == nlm_lck_denied) {
159                 struct file_lock        *fl = &resp->lock.fl;
160 
161                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
162                 *p++ = htonl(resp->lock.svid);
163 
164                 /* Encode owner handle. */
165                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
166                         return NULL;
167 
168                 start = loff_t_to_s32(fl->fl_start);
169                 if (fl->fl_end == OFFSET_MAX)
170                         len = 0;
171                 else
172                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
173 
174                 *p++ = htonl(start);
175                 *p++ = htonl(len);
176         }
177 
178         return p;
179 }
180 
181 
182 /*
183  * First, the server side XDR functions
184  */
185 int
186 nlmsvc_decode_testargs(struct svc_rqst *rqstp, __be32 *p)
187 {
188         struct nlm_args *argp = rqstp->rq_argp;
189         u32     exclusive;
190 
191         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
192                 return 0;
193 
194         exclusive = ntohl(*p++);
195         if (!(p = nlm_decode_lock(p, &argp->lock)))
196                 return 0;
197         if (exclusive)
198                 argp->lock.fl.fl_type = F_WRLCK;
199 
200         return xdr_argsize_check(rqstp, p);
201 }
202 
203 int
204 nlmsvc_encode_testres(struct svc_rqst *rqstp, __be32 *p)
205 {
206         struct nlm_res *resp = rqstp->rq_resp;
207 
208         if (!(p = nlm_encode_testres(p, resp)))
209                 return 0;
210         return xdr_ressize_check(rqstp, p);
211 }
212 
213 int
214 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p)
215 {
216         struct nlm_args *argp = rqstp->rq_argp;
217         u32     exclusive;
218 
219         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
220                 return 0;
221         argp->block  = ntohl(*p++);
222         exclusive    = ntohl(*p++);
223         if (!(p = nlm_decode_lock(p, &argp->lock)))
224                 return 0;
225         if (exclusive)
226                 argp->lock.fl.fl_type = F_WRLCK;
227         argp->reclaim = ntohl(*p++);
228         argp->state   = ntohl(*p++);
229         argp->monitor = 1;              /* monitor client by default */
230 
231         return xdr_argsize_check(rqstp, p);
232 }
233 
234 int
235 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p)
236 {
237         struct nlm_args *argp = rqstp->rq_argp;
238         u32     exclusive;
239 
240         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
241                 return 0;
242         argp->block = ntohl(*p++);
243         exclusive = ntohl(*p++);
244         if (!(p = nlm_decode_lock(p, &argp->lock)))
245                 return 0;
246         if (exclusive)
247                 argp->lock.fl.fl_type = F_WRLCK;
248         return xdr_argsize_check(rqstp, p);
249 }
250 
251 int
252 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p)
253 {
254         struct nlm_args *argp = rqstp->rq_argp;
255 
256         if (!(p = nlm_decode_cookie(p, &argp->cookie))
257          || !(p = nlm_decode_lock(p, &argp->lock)))
258                 return 0;
259         argp->lock.fl.fl_type = F_UNLCK;
260         return xdr_argsize_check(rqstp, p);
261 }
262 
263 int
264 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p)
265 {
266         struct nlm_args *argp = rqstp->rq_argp;
267         struct nlm_lock *lock = &argp->lock;
268 
269         memset(lock, 0, sizeof(*lock));
270         locks_init_lock(&lock->fl);
271         lock->svid = ~(u32) 0;
272         lock->fl.fl_pid = current->tgid;
273 
274         if (!(p = nlm_decode_cookie(p, &argp->cookie))
275          || !(p = xdr_decode_string_inplace(p, &lock->caller,
276                                             &lock->len, NLM_MAXSTRLEN))
277          || !(p = nlm_decode_fh(p, &lock->fh))
278          || !(p = nlm_decode_oh(p, &lock->oh)))
279                 return 0;
280         argp->fsm_mode = ntohl(*p++);
281         argp->fsm_access = ntohl(*p++);
282         return xdr_argsize_check(rqstp, p);
283 }
284 
285 int
286 nlmsvc_encode_shareres(struct svc_rqst *rqstp, __be32 *p)
287 {
288         struct nlm_res *resp = rqstp->rq_resp;
289 
290         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
291                 return 0;
292         *p++ = resp->status;
293         *p++ = xdr_zero;                /* sequence argument */
294         return xdr_ressize_check(rqstp, p);
295 }
296 
297 int
298 nlmsvc_encode_res(struct svc_rqst *rqstp, __be32 *p)
299 {
300         struct nlm_res *resp = rqstp->rq_resp;
301 
302         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
303                 return 0;
304         *p++ = resp->status;
305         return xdr_ressize_check(rqstp, p);
306 }
307 
308 int
309 nlmsvc_decode_notify(struct svc_rqst *rqstp, __be32 *p)
310 {
311         struct nlm_args *argp = rqstp->rq_argp;
312         struct nlm_lock *lock = &argp->lock;
313 
314         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
315                                             &lock->len, NLM_MAXSTRLEN)))
316                 return 0;
317         argp->state = ntohl(*p++);
318         return xdr_argsize_check(rqstp, p);
319 }
320 
321 int
322 nlmsvc_decode_reboot(struct svc_rqst *rqstp, __be32 *p)
323 {
324         struct nlm_reboot *argp = rqstp->rq_argp;
325 
326         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
327                 return 0;
328         argp->state = ntohl(*p++);
329         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
330         p += XDR_QUADLEN(SM_PRIV_SIZE);
331         return xdr_argsize_check(rqstp, p);
332 }
333 
334 int
335 nlmsvc_decode_res(struct svc_rqst *rqstp, __be32 *p)
336 {
337         struct nlm_res *resp = rqstp->rq_argp;
338 
339         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
340                 return 0;
341         resp->status = *p++;
342         return xdr_argsize_check(rqstp, p);
343 }
344 
345 int
346 nlmsvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
347 {
348         return xdr_argsize_check(rqstp, p);
349 }
350 
351 int
352 nlmsvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
353 {
354         return xdr_ressize_check(rqstp, p);
355 }
356 

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