1 /*
2 * linux/fs/lockd/xdr.c
3 *
4 * XDR support for lockd and the lock client.
5 *
6 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #include <linux/config.h>
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
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 inline u32 *nlm_decode_cookie(u32 *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 printk(KERN_NOTICE
67 "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
68 return NULL;
69 }
70 return p;
71 }
72
73 static inline u32 *
74 nlm_encode_cookie(u32 *p, struct nlm_cookie *c)
75 {
76 *p++ = htonl(c->len);
77 memcpy(p, c->data, c->len);
78 p+=XDR_QUADLEN(c->len);
79 return p;
80 }
81
82 static inline u32 *
83 nlm_decode_fh(u32 *p, struct nfs_fh *f)
84 {
85 unsigned int len;
86
87 if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
88 printk(KERN_NOTICE
89 "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 static inline u32 *
100 nlm_encode_fh(u32 *p, struct nfs_fh *f)
101 {
102 *p++ = htonl(NFS2_FHSIZE);
103 memcpy(p, f->data, NFS2_FHSIZE);
104 return p + XDR_QUADLEN(NFS2_FHSIZE);
105 }
106
107 /*
108 * Encode and decode owner handle
109 */
110 static inline u32 *
111 nlm_decode_oh(u32 *p, struct xdr_netobj *oh)
112 {
113 return xdr_decode_netobj(p, oh);
114 }
115
116 static inline u32 *
117 nlm_encode_oh(u32 *p, struct xdr_netobj *oh)
118 {
119 return xdr_encode_netobj(p, oh);
120 }
121
122 static inline u32 *
123 nlm_decode_lock(u32 *p, struct nlm_lock *lock)
124 {
125 struct file_lock *fl = &lock->fl;
126 s32 start, len, end;
127
128 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
129 &lock->len,
130 NLM_MAXSTRLEN))
131 || !(p = nlm_decode_fh(p, &lock->fh))
132 || !(p = nlm_decode_oh(p, &lock->oh)))
133 return NULL;
134
135 locks_init_lock(fl);
136 fl->fl_owner = current->files;
137 fl->fl_pid = ntohl(*p++);
138 fl->fl_flags = FL_POSIX;
139 fl->fl_type = F_RDLCK; /* as good as anything else */
140 start = ntohl(*p++);
141 len = ntohl(*p++);
142 end = start + len - 1;
143
144 fl->fl_start = s32_to_loff_t(start);
145
146 if (len == 0 || end < 0)
147 fl->fl_end = OFFSET_MAX;
148 else
149 fl->fl_end = s32_to_loff_t(end);
150 return p;
151 }
152
153 /*
154 * Encode a lock as part of an NLM call
155 */
156 static u32 *
157 nlm_encode_lock(u32 *p, struct nlm_lock *lock)
158 {
159 struct file_lock *fl = &lock->fl;
160 __s32 start, len;
161
162 if (!(p = xdr_encode_string(p, lock->caller))
163 || !(p = nlm_encode_fh(p, &lock->fh))
164 || !(p = nlm_encode_oh(p, &lock->oh)))
165 return NULL;
166
167 if (fl->fl_start > NLM_OFFSET_MAX
168 || (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
169 return NULL;
170
171 start = loff_t_to_s32(fl->fl_start);
172 if (fl->fl_end == OFFSET_MAX)
173 len = 0;
174 else
175 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
176
177 *p++ = htonl(fl->fl_pid);
178 *p++ = htonl(start);
179 *p++ = htonl(len);
180
181 return p;
182 }
183
184 /*
185 * Encode result of a TEST/TEST_MSG call
186 */
187 static u32 *
188 nlm_encode_testres(u32 *p, struct nlm_res *resp)
189 {
190 s32 start, len;
191
192 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
193 return NULL;
194 *p++ = resp->status;
195
196 if (resp->status == nlm_lck_denied) {
197 struct file_lock *fl = &resp->lock.fl;
198
199 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
200 *p++ = htonl(fl->fl_pid);
201
202 /* Encode owner handle. */
203 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
204 return NULL;
205
206 start = loff_t_to_s32(fl->fl_start);
207 if (fl->fl_end == OFFSET_MAX)
208 len = 0;
209 else
210 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
211
212 *p++ = htonl(start);
213 *p++ = htonl(len);
214 }
215
216 return p;
217 }
218
219
220 /*
221 * First, the server side XDR functions
222 */
223 int
224 nlmsvc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
225 {
226 u32 exclusive;
227
228 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
229 return 0;
230
231 exclusive = ntohl(*p++);
232 if (!(p = nlm_decode_lock(p, &argp->lock)))
233 return 0;
234 if (exclusive)
235 argp->lock.fl.fl_type = F_WRLCK;
236
237 return xdr_argsize_check(rqstp, p);
238 }
239
240 int
241 nlmsvc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
242 {
243 if (!(p = nlm_encode_testres(p, resp)))
244 return 0;
245 return xdr_ressize_check(rqstp, p);
246 }
247
248 int
249 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
250 {
251 u32 exclusive;
252
253 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
254 return 0;
255 argp->block = ntohl(*p++);
256 exclusive = ntohl(*p++);
257 if (!(p = nlm_decode_lock(p, &argp->lock)))
258 return 0;
259 if (exclusive)
260 argp->lock.fl.fl_type = F_WRLCK;
261 argp->reclaim = ntohl(*p++);
262 argp->state = ntohl(*p++);
263 argp->monitor = 1; /* monitor client by default */
264
265 return xdr_argsize_check(rqstp, p);
266 }
267
268 int
269 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
270 {
271 u32 exclusive;
272
273 if (!(p = nlm_decode_cookie(p, &argp->cookie)))
274 return 0;
275 argp->block = ntohl(*p++);
276 exclusive = ntohl(*p++);
277 if (!(p = nlm_decode_lock(p, &argp->lock)))
278 return 0;
279 if (exclusive)
280 argp->lock.fl.fl_type = F_WRLCK;
281 return xdr_argsize_check(rqstp, p);
282 }
283
284 int
285 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
286 {
287 if (!(p = nlm_decode_cookie(p, &argp->cookie))
288 || !(p = nlm_decode_lock(p, &argp->lock)))
289 return 0;
290 argp->lock.fl.fl_type = F_UNLCK;
291 return xdr_argsize_check(rqstp, p);
292 }
293
294 int
295 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
296 {
297 struct nlm_lock *lock = &argp->lock;
298
299 memset(lock, 0, sizeof(*lock));
300 locks_init_lock(&lock->fl);
301 lock->fl.fl_pid = ~(u32) 0;
302
303 if (!(p = nlm_decode_cookie(p, &argp->cookie))
304 || !(p = xdr_decode_string_inplace(p, &lock->caller,
305 &lock->len, NLM_MAXSTRLEN))
306 || !(p = nlm_decode_fh(p, &lock->fh))
307 || !(p = nlm_decode_oh(p, &lock->oh)))
308 return 0;
309 argp->fsm_mode = ntohl(*p++);
310 argp->fsm_access = ntohl(*p++);
311 return xdr_argsize_check(rqstp, p);
312 }
313
314 int
315 nlmsvc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
316 {
317 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
318 return 0;
319 *p++ = resp->status;
320 *p++ = xdr_zero; /* sequence argument */
321 return xdr_ressize_check(rqstp, p);
322 }
323
324 int
325 nlmsvc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
326 {
327 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
328 return 0;
329 *p++ = resp->status;
330 return xdr_ressize_check(rqstp, p);
331 }
332
333 int
334 nlmsvc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
335 {
336 struct nlm_lock *lock = &argp->lock;
337
338 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
339 &lock->len, NLM_MAXSTRLEN)))
340 return 0;
341 argp->state = ntohl(*p++);
342 return xdr_argsize_check(rqstp, p);
343 }
344
345 int
346 nlmsvc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
347 {
348 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
349 return 0;
350 argp->state = ntohl(*p++);
351 /* Preserve the address in network byte order */
352 argp->addr = *p++;
353 argp->vers = *p++;
354 argp->proto = *p++;
355 return xdr_argsize_check(rqstp, p);
356 }
357
358 int
359 nlmsvc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
360 {
361 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
362 return 0;
363 resp->status = ntohl(*p++);
364 return xdr_argsize_check(rqstp, p);
365 }
366
367 int
368 nlmsvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
369 {
370 return xdr_argsize_check(rqstp, p);
371 }
372
373 int
374 nlmsvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
375 {
376 return xdr_ressize_check(rqstp, p);
377 }
378
379 /*
380 * Now, the client side XDR functions
381 */
382 #ifdef NLMCLNT_SUPPORT_SHARES
383 static int
384 nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
385 {
386 return 0;
387 }
388 #endif
389
390 static int
391 nlmclt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
392 {
393 struct nlm_lock *lock = &argp->lock;
394
395 if (!(p = nlm_encode_cookie(p, &argp->cookie)))
396 return -EIO;
397 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
398 if (!(p = nlm_encode_lock(p, lock)))
399 return -EIO;
400 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
401 return 0;
402 }
403
404 static int
405 nlmclt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
406 {
407 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
408 return -EIO;
409 resp->status = ntohl(*p++);
410 if (resp->status == NLM_LCK_DENIED) {
411 struct file_lock *fl = &resp->lock.fl;
412 u32 excl;
413 s32 start, len, end;
414
415 memset(&resp->lock, 0, sizeof(resp->lock));
416 locks_init_lock(fl);
417 excl = ntohl(*p++);
418 fl->fl_pid = ntohl(*p++);
419 if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
420 return -EIO;
421
422 fl->fl_flags = FL_POSIX;
423 fl->fl_type = excl? F_WRLCK : F_RDLCK;
424 start = ntohl(*p++);
425 len = ntohl(*p++);
426 end = start + len - 1;
427
428 fl->fl_start = s32_to_loff_t(start);
429 if (len == 0 || end < 0)
430 fl->fl_end = OFFSET_MAX;
431 else
432 fl->fl_end = s32_to_loff_t(end);
433 }
434 return 0;
435 }
436
437
438 static int
439 nlmclt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
440 {
441 struct nlm_lock *lock = &argp->lock;
442
443 if (!(p = nlm_encode_cookie(p, &argp->cookie)))
444 return -EIO;
445 *p++ = argp->block? xdr_one : xdr_zero;
446 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
447 if (!(p = nlm_encode_lock(p, lock)))
448 return -EIO;
449 *p++ = argp->reclaim? xdr_one : xdr_zero;
450 *p++ = htonl(argp->state);
451 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
452 return 0;
453 }
454
455 static int
456 nlmclt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
457 {
458 struct nlm_lock *lock = &argp->lock;
459
460 if (!(p = nlm_encode_cookie(p, &argp->cookie)))
461 return -EIO;
462 *p++ = argp->block? xdr_one : xdr_zero;
463 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
464 if (!(p = nlm_encode_lock(p, lock)))
465 return -EIO;
466 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
467 return 0;
468 }
469
470 static int
471 nlmclt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
472 {
473 struct nlm_lock *lock = &argp->lock;
474
475 if (!(p = nlm_encode_cookie(p, &argp->cookie)))
476 return -EIO;
477 if (!(p = nlm_encode_lock(p, lock)))
478 return -EIO;
479 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
480 return 0;
481 }
482
483 static int
484 nlmclt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
485 {
486 if (!(p = nlm_encode_cookie(p, &resp->cookie)))
487 return -EIO;
488 *p++ = resp->status;
489 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
490 return 0;
491 }
492
493 static int
494 nlmclt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
495 {
496 if (!(p = nlm_encode_testres(p, resp)))
497 return -EIO;
498 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
499 return 0;
500 }
501
502 static int
503 nlmclt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
504 {
505 if (!(p = nlm_decode_cookie(p, &resp->cookie)))
506 return -EIO;
507 resp->status = ntohl(*p++);
508 return 0;
509 }
510
511 /*
512 * Buffer requirements for NLM
513 */
514 #define NLM_void_sz 0
515 #define NLM_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
516 #define NLM_caller_sz 1+XDR_QUADLEN(sizeof(system_utsname.nodename))
517 #define NLM_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ)
518 /* #define NLM_owner_sz 1+XDR_QUADLEN(NLM_MAXOWNER) */
519 #define NLM_fhandle_sz 1+XDR_QUADLEN(NFS2_FHSIZE)
520 #define NLM_lock_sz 3+NLM_caller_sz+NLM_netobj_sz+NLM_fhandle_sz
521 #define NLM_holder_sz 4+NLM_netobj_sz
522
523 #define NLM_testargs_sz NLM_cookie_sz+1+NLM_lock_sz
524 #define NLM_lockargs_sz NLM_cookie_sz+4+NLM_lock_sz
525 #define NLM_cancargs_sz NLM_cookie_sz+2+NLM_lock_sz
526 #define NLM_unlockargs_sz NLM_cookie_sz+NLM_lock_sz
527
528 #define NLM_testres_sz NLM_cookie_sz+1+NLM_holder_sz
529 #define NLM_res_sz NLM_cookie_sz+1
530 #define NLM_norep_sz 0
531
532 #ifndef MAX
533 # define MAX(a, b) (((a) > (b))? (a) : (b))
534 #endif
535
536 /*
537 * For NLM, a void procedure really returns nothing
538 */
539 #define nlmclt_decode_norep NULL
540
541 #define PROC(proc, argtype, restype) \
542 [NLMPROC_##proc] = { \
543 .p_proc = NLMPROC_##proc, \
544 .p_encode = (kxdrproc_t) nlmclt_encode_##argtype, \
545 .p_decode = (kxdrproc_t) nlmclt_decode_##restype, \
546 .p_bufsiz = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2 \
547 }
548
549 static struct rpc_procinfo nlm_procedures[] = {
550 PROC(TEST, testargs, testres),
551 PROC(LOCK, lockargs, res),
552 PROC(CANCEL, cancargs, res),
553 PROC(UNLOCK, unlockargs, res),
554 PROC(GRANTED, testargs, res),
555 PROC(TEST_MSG, testargs, norep),
556 PROC(LOCK_MSG, lockargs, norep),
557 PROC(CANCEL_MSG, cancargs, norep),
558 PROC(UNLOCK_MSG, unlockargs, norep),
559 PROC(GRANTED_MSG, testargs, norep),
560 PROC(TEST_RES, testres, norep),
561 PROC(LOCK_RES, res, norep),
562 PROC(CANCEL_RES, res, norep),
563 PROC(UNLOCK_RES, res, norep),
564 PROC(GRANTED_RES, res, norep),
565 #ifdef NLMCLNT_SUPPORT_SHARES
566 PROC(SHARE, shareargs, shareres),
567 PROC(UNSHARE, shareargs, shareres),
568 PROC(NM_LOCK, lockargs, res),
569 PROC(FREE_ALL, notify, void),
570 #endif
571 };
572
573 static struct rpc_version nlm_version1 = {
574 .number = 1,
575 .nrprocs = 16,
576 .procs = nlm_procedures,
577 };
578
579 static struct rpc_version nlm_version3 = {
580 .number = 3,
581 .nrprocs = 24,
582 .procs = nlm_procedures,
583 };
584
585 #ifdef CONFIG_LOCKD_V4
586 extern struct rpc_version nlm_version4;
587 #endif
588
589 static struct rpc_version * nlm_versions[] = {
590 [1] = &nlm_version1,
591 [3] = &nlm_version3,
592 #ifdef CONFIG_LOCKD_V4
593 [4] = &nlm_version4,
594 #endif
595 };
596
597 static struct rpc_stat nlm_stats;
598
599 struct rpc_program nlm_program = {
600 .name = "lockd",
601 .number = NLM_PROGRAM,
602 .nrvers = sizeof(nlm_versions) / sizeof(nlm_versions[0]),
603 .version = nlm_versions,
604 .stats = &nlm_stats,
605 };
606
607 #ifdef RPC_DEBUG
608 const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
609 {
610 /*
611 * We can get away with a static buffer because we're only
612 * called with BKL held.
613 */
614 static char buf[2*NLM_MAXCOOKIELEN+1];
615 int i;
616 int len = sizeof(buf);
617 char *p = buf;
618
619 len--; /* allow for trailing \0 */
620 if (len < 3)
621 return "???";
622 for (i = 0 ; i < cookie->len ; i++) {
623 if (len < 2) {
624 strcpy(p-3, "...");
625 break;
626 }
627 sprintf(p, "%02x", cookie->data[i]);
628 p += 2;
629 len -= 2;
630 }
631 *p = '\0';
632
633 return buf;
634 }
635 #endif
636
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