1 /*
2 * linux/fs/lockd/xdr4.c
3 *
4 * XDR support for lockd and the lock client.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
8 */
9
10 #include <linux/types.h>
11 #include <linux/sched.h>
12 #include <linux/utsname.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 #include <linux/lockd/sm_inter.h>
21
22 #define NLMDBG_FACILITY NLMDBG_XDR
23
24 static inline loff_t
25 s64_to_loff_t(__s64 offset)
26 {
27 return (loff_t)offset;
28 }
29
30
31 static inline s64
32 loff_t_to_s64(loff_t offset)
33 {
34 s64 res;
35 if (offset > NLM4_OFFSET_MAX)
36 res = NLM4_OFFSET_MAX;
37 else if (offset < -NLM4_OFFSET_MAX)
38 res = -NLM4_OFFSET_MAX;
39 else
40 res = offset;
41 return res;
42 }
43
44 /*
45 * XDR functions for basic NLM types
46 */
47 static __be32 *
48 nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
49 {
50 unsigned int len;
51
52 len = ntohl(*p++);
53
54 if(len==0)
55 {
56 c->len=4;
57 memset(c->data, 0, 4); /* hockeypux brain damage */
58 }
59 else if(len<=NLM_MAXCOOKIELEN)
60 {
61 c->len=len;
62 memcpy(c->data, p, len);
63 p+=XDR_QUADLEN(len);
64 }
65 else
66 {
67 dprintk("lockd: bad cookie size %d (only cookies under "
68 "%d bytes are supported.)\n",
69 len, NLM_MAXCOOKIELEN);
70 return NULL;
71 }
72 return p;
73 }
74
75 static __be32 *
76 nlm4_encode_cookie(__be32 *p, struct nlm_cookie *c)
77 {
78 *p++ = htonl(c->len);
79 memcpy(p, c->data, c->len);
80 p+=XDR_QUADLEN(c->len);
81 return p;
82 }
83
84 static __be32 *
85 nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
86 {
87 memset(f->data, 0, sizeof(f->data));
88 f->size = ntohl(*p++);
89 if (f->size > NFS_MAXFHSIZE) {
90 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
91 f->size, NFS_MAXFHSIZE);
92 return NULL;
93 }
94 memcpy(f->data, p, f->size);
95 return p + XDR_QUADLEN(f->size);
96 }
97
98 static __be32 *
99 nlm4_encode_fh(__be32 *p, struct nfs_fh *f)
100 {
101 *p++ = htonl(f->size);
102 if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */
103 memcpy(p, f->data, f->size);
104 return p + XDR_QUADLEN(f->size);
105 }
106
107 /*
108 * Encode and decode owner handle
109 */
110 static __be32 *
111 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
112 {
113 return xdr_decode_netobj(p, oh);
114 }
115
116 static __be32 *
117 nlm4_encode_oh(__be32 *p, struct xdr_netobj *oh)
118 {
119 return xdr_encode_netobj(p, oh);
120 }
121
122 static __be32 *
123 nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
124 {
125 struct file_lock *fl = &lock->fl;
126 __u64 len, start;
127 __s64 end;
128
129 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
130 &lock->len, NLM_MAXSTRLEN))
131 || !(p = nlm4_decode_fh(p, &lock->fh))
132 || !(p = nlm4_decode_oh(p, &lock->oh)))
133 return NULL;
134 lock->svid = ntohl(*p++);
135
136 locks_init_lock(fl);
137 fl->fl_owner = current->files;
138 fl->fl_pid = (pid_t)lock->svid;
139 fl->fl_flags = FL_POSIX;
140 fl->fl_type = F_RDLCK; /* as good as anything else */
141 p = xdr_decode_hyper(p, &start);
142 p = xdr_decode_hyper(p, &len);
143 end = start + len - 1;
144
145 fl->fl_start = s64_to_loff_t(start);
146
147 if (len == 0 || end < 0)
148 fl->fl_end = OFFSET_MAX;
149 else
150 fl->fl_end = s64_to_loff_t(end);
151 return p;
152 }
153
154 /*
155 * Encode a lock as part of an NLM call
156 */
157 static __be32 *
158 nlm4_encode_lock(__be32 *p, struct nlm_lock *lock)
159 {
160 struct file_lock *fl = &lock->fl;
161 __s64 start, len;
162
163 if (!(p = xdr_encode_string(p, lock->caller))
164 || !(p = nlm4_encode_fh(p, &lock->fh))
165 || !(p = nlm4_encode_oh(p, &lock->oh)))
166 return NULL;
167
168 if (fl->fl_start > NLM4_OFFSET_MAX
169 || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
170 return NULL;
171
172 *p++ = htonl(lock->svid);
173
174 start = loff_t_to_s64(fl->fl_start);
175 if (fl->fl_end == OFFSET_MAX)
176 len = 0;
177 else
178 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
179
180 p = xdr_encode_hyper(p, start);
181 p = xdr_encode_hyper(p, len);
182
183 return p;
184 }
185
186 /*
187 * Encode result of a TEST/TEST_MSG call
188 */
189 static __be32 *
190 nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
191 {
192 s64 start, len;
193
194 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
195 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
196 return NULL;
197 *p++ = resp->status;
198
199 if (resp->status == nlm_lck_denied) {
200 struct file_lock *fl = &resp->lock.fl;
201
202 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
203 *p++ = htonl(resp->lock.svid);
204
205 /* Encode owner handle. */
206 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
207 return NULL;
208
209 start = loff_t_to_s64(fl->fl_start);
210 if (fl->fl_end == OFFSET_MAX)
211 len = 0;
212 else
213 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
214
215 p = xdr_encode_hyper(p, start);
216 p = xdr_encode_hyper(p, len);
217 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
218 resp->status, (int)resp->lock.svid, fl->fl_type,
219 (long long)fl->fl_start, (long long)fl->fl_end);
220 }
221
222 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
223 return p;
224 }
225
226
227 /*
228 * First, the server side XDR functions
229 */
230 int
231 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
232 {
233 u32 exclusive;
234
235 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
236 return 0;
237
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
244 return xdr_argsize_check(rqstp, p);
245 }
246
247 int
248 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
249 {
250 if (!(p = nlm4_encode_testres(p, resp)))
251 return 0;
252 return xdr_ressize_check(rqstp, p);
253 }
254
255 int
256 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
257 {
258 u32 exclusive;
259
260 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
261 return 0;
262 argp->block = ntohl(*p++);
263 exclusive = ntohl(*p++);
264 if (!(p = nlm4_decode_lock(p, &argp->lock)))
265 return 0;
266 if (exclusive)
267 argp->lock.fl.fl_type = F_WRLCK;
268 argp->reclaim = ntohl(*p++);
269 argp->state = ntohl(*p++);
270 argp->monitor = 1; /* monitor client by default */
271
272 return xdr_argsize_check(rqstp, p);
273 }
274
275 int
276 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
277 {
278 u32 exclusive;
279
280 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
281 return 0;
282 argp->block = ntohl(*p++);
283 exclusive = ntohl(*p++);
284 if (!(p = nlm4_decode_lock(p, &argp->lock)))
285 return 0;
286 if (exclusive)
287 argp->lock.fl.fl_type = F_WRLCK;
288 return xdr_argsize_check(rqstp, p);
289 }
290
291 int
292 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
293 {
294 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
295 || !(p = nlm4_decode_lock(p, &argp->lock)))
296 return 0;
297 argp->lock.fl.fl_type = F_UNLCK;
298 return xdr_argsize_check(rqstp, p);
299 }
300
301 int
302 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
303 {
304 struct nlm_lock *lock = &argp->lock;
305
306 memset(lock, 0, sizeof(*lock));
307 locks_init_lock(&lock->fl);
308 lock->svid = ~(u32) 0;
309 lock->fl.fl_pid = (pid_t)lock->svid;
310
311 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
312 || !(p = xdr_decode_string_inplace(p, &lock->caller,
313 &lock->len, NLM_MAXSTRLEN))
314 || !(p = nlm4_decode_fh(p, &lock->fh))
315 || !(p = nlm4_decode_oh(p, &lock->oh)))
316 return 0;
317 argp->fsm_mode = ntohl(*p++);
318 argp->fsm_access = ntohl(*p++);
319 return xdr_argsize_check(rqstp, p);
320 }
321
322 int
323 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
324 {
325 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
326 return 0;
327 *p++ = resp->status;
328 *p++ = xdr_zero; /* sequence argument */
329 return xdr_ressize_check(rqstp, p);
330 }
331
332 int
333 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
334 {
335 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
336 return 0;
337 *p++ = resp->status;
338 return xdr_ressize_check(rqstp, p);
339 }
340
341 int
342 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
343 {
344 struct nlm_lock *lock = &argp->lock;
345
346 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
347 &lock->len, NLM_MAXSTRLEN)))
348 return 0;
349 argp->state = ntohl(*p++);
350 return xdr_argsize_check(rqstp, p);
351 }
352
353 int
354 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
355 {
356 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
357 return 0;
358 argp->state = ntohl(*p++);
359 /* Preserve the address in network byte order */
360 argp->addr = *p++;
361 argp->vers = *p++;
362 argp->proto = *p++;
363 return xdr_argsize_check(rqstp, p);
364 }
365
366 int
367 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
368 {
369 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
370 return 0;
371 resp->status = *p++;
372 return xdr_argsize_check(rqstp, p);
373 }
374
375 int
376 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
377 {
378 return xdr_argsize_check(rqstp, p);
379 }
380
381 int
382 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
383 {
384 return xdr_ressize_check(rqstp, p);
385 }
386
387 /*
388 * Now, the client side XDR functions
389 */
390 #ifdef NLMCLNT_SUPPORT_SHARES
391 static int
392 nlm4clt_decode_void(struct rpc_rqst *req, __be32 *p, void *ptr)
393 {
394 return 0;
395 }
396 #endif
397
398 static int
399 nlm4clt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
400 {
401 struct nlm_lock *lock = &argp->lock;
402
403 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
404 return -EIO;
405 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
406 if (!(p = nlm4_encode_lock(p, lock)))
407 return -EIO;
408 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
409 return 0;
410 }
411
412 static int
413 nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
414 {
415 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
416 return -EIO;
417 resp->status = *p++;
418 if (resp->status == nlm_lck_denied) {
419 struct file_lock *fl = &resp->lock.fl;
420 u32 excl;
421 __u64 start, len;
422 __s64 end;
423
424 memset(&resp->lock, 0, sizeof(resp->lock));
425 locks_init_lock(fl);
426 excl = ntohl(*p++);
427 resp->lock.svid = ntohl(*p++);
428 fl->fl_pid = (pid_t)resp->lock.svid;
429 if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
430 return -EIO;
431
432 fl->fl_flags = FL_POSIX;
433 fl->fl_type = excl? F_WRLCK : F_RDLCK;
434 p = xdr_decode_hyper(p, &start);
435 p = xdr_decode_hyper(p, &len);
436 end = start + len - 1;
437
438 fl->fl_start = s64_to_loff_t(start);
439 if (len == 0 || end < 0)
440 fl->fl_end = OFFSET_MAX;
441 else
442 fl->fl_end = s64_to_loff_t(end);
443 }
444 return 0;
445 }
446
447
448 static int
449 nlm4clt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
450 {
451 struct nlm_lock *lock = &argp->lock;
452
453 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
454 return -EIO;
455 *p++ = argp->block? xdr_one : xdr_zero;
456 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
457 if (!(p = nlm4_encode_lock(p, lock)))
458 return -EIO;
459 *p++ = argp->reclaim? xdr_one : xdr_zero;
460 *p++ = htonl(argp->state);
461 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
462 return 0;
463 }
464
465 static int
466 nlm4clt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
467 {
468 struct nlm_lock *lock = &argp->lock;
469
470 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
471 return -EIO;
472 *p++ = argp->block? xdr_one : xdr_zero;
473 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
474 if (!(p = nlm4_encode_lock(p, lock)))
475 return -EIO;
476 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
477 return 0;
478 }
479
480 static int
481 nlm4clt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
482 {
483 struct nlm_lock *lock = &argp->lock;
484
485 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
486 return -EIO;
487 if (!(p = nlm4_encode_lock(p, lock)))
488 return -EIO;
489 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
490 return 0;
491 }
492
493 static int
494 nlm4clt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
495 {
496 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
497 return -EIO;
498 *p++ = resp->status;
499 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
500 return 0;
501 }
502
503 static int
504 nlm4clt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
505 {
506 if (!(p = nlm4_encode_testres(p, resp)))
507 return -EIO;
508 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
509 return 0;
510 }
511
512 static int
513 nlm4clt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
514 {
515 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
516 return -EIO;
517 resp->status = *p++;
518 return 0;
519 }
520
521 #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
522 # error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
523 #endif
524
525 #if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
526 # error "NLM host name cannot be larger than NLM's maximum string length!"
527 #endif
528
529 /*
530 * Buffer requirements for NLM
531 */
532 #define NLM4_void_sz 0
533 #define NLM4_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
534 #define NLM4_caller_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
535 #define NLM4_owner_sz 1+XDR_QUADLEN(NLMCLNT_OHSIZE)
536 #define NLM4_fhandle_sz 1+XDR_QUADLEN(NFS3_FHSIZE)
537 #define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz
538 #define NLM4_holder_sz 6+NLM4_owner_sz
539
540 #define NLM4_testargs_sz NLM4_cookie_sz+1+NLM4_lock_sz
541 #define NLM4_lockargs_sz NLM4_cookie_sz+4+NLM4_lock_sz
542 #define NLM4_cancargs_sz NLM4_cookie_sz+2+NLM4_lock_sz
543 #define NLM4_unlockargs_sz NLM4_cookie_sz+NLM4_lock_sz
544
545 #define NLM4_testres_sz NLM4_cookie_sz+1+NLM4_holder_sz
546 #define NLM4_res_sz NLM4_cookie_sz+1
547 #define NLM4_norep_sz 0
548
549 /*
550 * For NLM, a void procedure really returns nothing
551 */
552 #define nlm4clt_decode_norep NULL
553
554 #define PROC(proc, argtype, restype) \
555 [NLMPROC_##proc] = { \
556 .p_proc = NLMPROC_##proc, \
557 .p_encode = (kxdrproc_t) nlm4clt_encode_##argtype, \
558 .p_decode = (kxdrproc_t) nlm4clt_decode_##restype, \
559 .p_arglen = NLM4_##argtype##_sz, \
560 .p_replen = NLM4_##restype##_sz, \
561 .p_statidx = NLMPROC_##proc, \
562 .p_name = #proc, \
563 }
564
565 static struct rpc_procinfo nlm4_procedures[] = {
566 PROC(TEST, testargs, testres),
567 PROC(LOCK, lockargs, res),
568 PROC(CANCEL, cancargs, res),
569 PROC(UNLOCK, unlockargs, res),
570 PROC(GRANTED, testargs, res),
571 PROC(TEST_MSG, testargs, norep),
572 PROC(LOCK_MSG, lockargs, norep),
573 PROC(CANCEL_MSG, cancargs, norep),
574 PROC(UNLOCK_MSG, unlockargs, norep),
575 PROC(GRANTED_MSG, testargs, norep),
576 PROC(TEST_RES, testres, norep),
577 PROC(LOCK_RES, res, norep),
578 PROC(CANCEL_RES, res, norep),
579 PROC(UNLOCK_RES, res, norep),
580 PROC(GRANTED_RES, res, norep),
581 #ifdef NLMCLNT_SUPPORT_SHARES
582 PROC(SHARE, shareargs, shareres),
583 PROC(UNSHARE, shareargs, shareres),
584 PROC(NM_LOCK, lockargs, res),
585 PROC(FREE_ALL, notify, void),
586 #endif
587 };
588
589 struct rpc_version nlm_version4 = {
590 .number = 4,
591 .nrprocs = 24,
592 .procs = nlm4_procedures,
593 };
594
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