blob: 36eb175ec3356c23b4d9bab42ffe23945266904f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
24static inline loff_t
25s64_to_loff_t(__s64 offset)
26{
27 return (loff_t)offset;
28}
29
30
31static inline s64
32loff_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 */
47static u32 *
48nlm4_decode_cookie(u32 *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 printk(KERN_NOTICE
68 "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
69 return NULL;
70 }
71 return p;
72}
73
74static u32 *
75nlm4_encode_cookie(u32 *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
83static u32 *
84nlm4_decode_fh(u32 *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 printk(KERN_NOTICE
90 "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
98static u32 *
99nlm4_encode_fh(u32 *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 */
110static u32 *
111nlm4_decode_oh(u32 *p, struct xdr_netobj *oh)
112{
113 return xdr_decode_netobj(p, oh);
114}
115
116static u32 *
117nlm4_encode_oh(u32 *p, struct xdr_netobj *oh)
118{
119 return xdr_encode_netobj(p, oh);
120}
121
122static u32 *
123nlm4_decode_lock(u32 *p, struct nlm_lock *lock)
124{
125 struct file_lock *fl = &lock->fl;
126 __s64 len, start, end;
127
128 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
129 &lock->len, NLM_MAXSTRLEN))
130 || !(p = nlm4_decode_fh(p, &lock->fh))
131 || !(p = nlm4_decode_oh(p, &lock->oh)))
132 return NULL;
Trond Myklebust7bab3772006-03-20 13:44:06 -0500133 lock->svid = ntohl(*p++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
135 locks_init_lock(fl);
136 fl->fl_owner = current->files;
Trond Myklebust7bab3772006-03-20 13:44:06 -0500137 fl->fl_pid = (pid_t)lock->svid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 fl->fl_flags = FL_POSIX;
139 fl->fl_type = F_RDLCK; /* as good as anything else */
140 p = xdr_decode_hyper(p, &start);
141 p = xdr_decode_hyper(p, &len);
142 end = start + len - 1;
143
144 fl->fl_start = s64_to_loff_t(start);
145
146 if (len == 0 || end < 0)
147 fl->fl_end = OFFSET_MAX;
148 else
149 fl->fl_end = s64_to_loff_t(end);
150 return p;
151}
152
153/*
154 * Encode a lock as part of an NLM call
155 */
156static u32 *
157nlm4_encode_lock(u32 *p, struct nlm_lock *lock)
158{
159 struct file_lock *fl = &lock->fl;
160 __s64 start, len;
161
162 if (!(p = xdr_encode_string(p, lock->caller))
163 || !(p = nlm4_encode_fh(p, &lock->fh))
164 || !(p = nlm4_encode_oh(p, &lock->oh)))
165 return NULL;
166
167 if (fl->fl_start > NLM4_OFFSET_MAX
168 || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
169 return NULL;
170
Trond Myklebust7bab3772006-03-20 13:44:06 -0500171 *p++ = htonl(lock->svid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 start = loff_t_to_s64(fl->fl_start);
174 if (fl->fl_end == OFFSET_MAX)
175 len = 0;
176 else
177 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
178
179 p = xdr_encode_hyper(p, start);
180 p = xdr_encode_hyper(p, len);
181
182 return p;
183}
184
185/*
186 * Encode result of a TEST/TEST_MSG call
187 */
188static u32 *
189nlm4_encode_testres(u32 *p, struct nlm_res *resp)
190{
191 s64 start, len;
192
193 dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
194 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
195 return NULL;
196 *p++ = resp->status;
197
198 if (resp->status == nlm_lck_denied) {
199 struct file_lock *fl = &resp->lock.fl;
200
201 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
Trond Myklebust7bab3772006-03-20 13:44:06 -0500202 *p++ = htonl(resp->lock.svid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 /* Encode owner handle. */
205 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
206 return NULL;
207
208 start = loff_t_to_s64(fl->fl_start);
209 if (fl->fl_end == OFFSET_MAX)
210 len = 0;
211 else
212 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
213
214 p = xdr_encode_hyper(p, start);
215 p = xdr_encode_hyper(p, len);
Trond Myklebust7bab3772006-03-20 13:44:06 -0500216 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
217 resp->status, (int)resp->lock.svid, fl->fl_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 (long long)fl->fl_start, (long long)fl->fl_end);
219 }
220
221 dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
222 return p;
223}
224
225
226/*
227 * First, the server side XDR functions
228 */
229int
230nlm4svc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
231{
232 u32 exclusive;
233
234 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
235 return 0;
236
237 exclusive = ntohl(*p++);
238 if (!(p = nlm4_decode_lock(p, &argp->lock)))
239 return 0;
240 if (exclusive)
241 argp->lock.fl.fl_type = F_WRLCK;
242
243 return xdr_argsize_check(rqstp, p);
244}
245
246int
247nlm4svc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
248{
249 if (!(p = nlm4_encode_testres(p, resp)))
250 return 0;
251 return xdr_ressize_check(rqstp, p);
252}
253
254int
255nlm4svc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
256{
257 u32 exclusive;
258
259 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
260 return 0;
261 argp->block = ntohl(*p++);
262 exclusive = ntohl(*p++);
263 if (!(p = nlm4_decode_lock(p, &argp->lock)))
264 return 0;
265 if (exclusive)
266 argp->lock.fl.fl_type = F_WRLCK;
267 argp->reclaim = ntohl(*p++);
268 argp->state = ntohl(*p++);
269 argp->monitor = 1; /* monitor client by default */
270
271 return xdr_argsize_check(rqstp, p);
272}
273
274int
275nlm4svc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
276{
277 u32 exclusive;
278
279 if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
280 return 0;
281 argp->block = ntohl(*p++);
282 exclusive = ntohl(*p++);
283 if (!(p = nlm4_decode_lock(p, &argp->lock)))
284 return 0;
285 if (exclusive)
286 argp->lock.fl.fl_type = F_WRLCK;
287 return xdr_argsize_check(rqstp, p);
288}
289
290int
291nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
292{
293 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
294 || !(p = nlm4_decode_lock(p, &argp->lock)))
295 return 0;
296 argp->lock.fl.fl_type = F_UNLCK;
297 return xdr_argsize_check(rqstp, p);
298}
299
300int
301nlm4svc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
302{
303 struct nlm_lock *lock = &argp->lock;
304
305 memset(lock, 0, sizeof(*lock));
306 locks_init_lock(&lock->fl);
Trond Myklebust7bab3772006-03-20 13:44:06 -0500307 lock->svid = ~(u32) 0;
308 lock->fl.fl_pid = (pid_t)lock->svid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 if (!(p = nlm4_decode_cookie(p, &argp->cookie))
311 || !(p = xdr_decode_string_inplace(p, &lock->caller,
312 &lock->len, NLM_MAXSTRLEN))
313 || !(p = nlm4_decode_fh(p, &lock->fh))
314 || !(p = nlm4_decode_oh(p, &lock->oh)))
315 return 0;
316 argp->fsm_mode = ntohl(*p++);
317 argp->fsm_access = ntohl(*p++);
318 return xdr_argsize_check(rqstp, p);
319}
320
321int
322nlm4svc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
323{
324 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
325 return 0;
326 *p++ = resp->status;
327 *p++ = xdr_zero; /* sequence argument */
328 return xdr_ressize_check(rqstp, p);
329}
330
331int
332nlm4svc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
333{
334 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
335 return 0;
336 *p++ = resp->status;
337 return xdr_ressize_check(rqstp, p);
338}
339
340int
341nlm4svc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
342{
343 struct nlm_lock *lock = &argp->lock;
344
345 if (!(p = xdr_decode_string_inplace(p, &lock->caller,
346 &lock->len, NLM_MAXSTRLEN)))
347 return 0;
348 argp->state = ntohl(*p++);
349 return xdr_argsize_check(rqstp, p);
350}
351
352int
353nlm4svc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
354{
355 if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
356 return 0;
357 argp->state = ntohl(*p++);
358 /* Preserve the address in network byte order */
J. Bruce Fieldsa6597532006-01-03 09:55:46 +0100359 argp->addr = *p++;
360 argp->vers = *p++;
361 argp->proto = *p++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return xdr_argsize_check(rqstp, p);
363}
364
365int
366nlm4svc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
367{
368 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
369 return 0;
370 resp->status = ntohl(*p++);
371 return xdr_argsize_check(rqstp, p);
372}
373
374int
375nlm4svc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
376{
377 return xdr_argsize_check(rqstp, p);
378}
379
380int
381nlm4svc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
382{
383 return xdr_ressize_check(rqstp, p);
384}
385
386/*
387 * Now, the client side XDR functions
388 */
389#ifdef NLMCLNT_SUPPORT_SHARES
390static int
391nlm4clt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
392{
393 return 0;
394}
395#endif
396
397static int
398nlm4clt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
399{
400 struct nlm_lock *lock = &argp->lock;
401
402 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
403 return -EIO;
404 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
405 if (!(p = nlm4_encode_lock(p, lock)))
406 return -EIO;
407 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
408 return 0;
409}
410
411static int
412nlm4clt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
413{
414 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
415 return -EIO;
416 resp->status = ntohl(*p++);
417 if (resp->status == NLM_LCK_DENIED) {
418 struct file_lock *fl = &resp->lock.fl;
419 u32 excl;
420 s64 start, end, len;
421
422 memset(&resp->lock, 0, sizeof(resp->lock));
423 locks_init_lock(fl);
424 excl = ntohl(*p++);
Trond Myklebust7bab3772006-03-20 13:44:06 -0500425 resp->lock.svid = ntohl(*p++);
426 fl->fl_pid = (pid_t)resp->lock.svid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
428 return -EIO;
429
430 fl->fl_flags = FL_POSIX;
431 fl->fl_type = excl? F_WRLCK : F_RDLCK;
432 p = xdr_decode_hyper(p, &start);
433 p = xdr_decode_hyper(p, &len);
434 end = start + len - 1;
435
436 fl->fl_start = s64_to_loff_t(start);
437 if (len == 0 || end < 0)
438 fl->fl_end = OFFSET_MAX;
439 else
440 fl->fl_end = s64_to_loff_t(end);
441 }
442 return 0;
443}
444
445
446static int
447nlm4clt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
448{
449 struct nlm_lock *lock = &argp->lock;
450
451 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
452 return -EIO;
453 *p++ = argp->block? xdr_one : xdr_zero;
454 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
455 if (!(p = nlm4_encode_lock(p, lock)))
456 return -EIO;
457 *p++ = argp->reclaim? xdr_one : xdr_zero;
458 *p++ = htonl(argp->state);
459 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
460 return 0;
461}
462
463static int
464nlm4clt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
465{
466 struct nlm_lock *lock = &argp->lock;
467
468 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
469 return -EIO;
470 *p++ = argp->block? xdr_one : xdr_zero;
471 *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
472 if (!(p = nlm4_encode_lock(p, lock)))
473 return -EIO;
474 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
475 return 0;
476}
477
478static int
479nlm4clt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
480{
481 struct nlm_lock *lock = &argp->lock;
482
483 if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
484 return -EIO;
485 if (!(p = nlm4_encode_lock(p, lock)))
486 return -EIO;
487 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
488 return 0;
489}
490
491static int
492nlm4clt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
493{
494 if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
495 return -EIO;
496 *p++ = resp->status;
497 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
498 return 0;
499}
500
501static int
502nlm4clt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
503{
504 if (!(p = nlm4_encode_testres(p, resp)))
505 return -EIO;
506 req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
507 return 0;
508}
509
510static int
511nlm4clt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
512{
513 if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
514 return -EIO;
515 resp->status = ntohl(*p++);
516 return 0;
517}
518
519/*
520 * Buffer requirements for NLM
521 */
522#define NLM4_void_sz 0
523#define NLM4_cookie_sz 1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
524#define NLM4_caller_sz 1+XDR_QUADLEN(NLM_MAXSTRLEN)
525#define NLM4_netobj_sz 1+XDR_QUADLEN(XDR_MAX_NETOBJ)
526/* #define NLM4_owner_sz 1+XDR_QUADLEN(NLM4_MAXOWNER) */
527#define NLM4_fhandle_sz 1+XDR_QUADLEN(NFS3_FHSIZE)
528#define NLM4_lock_sz 5+NLM4_caller_sz+NLM4_netobj_sz+NLM4_fhandle_sz
529#define NLM4_holder_sz 6+NLM4_netobj_sz
530
531#define NLM4_testargs_sz NLM4_cookie_sz+1+NLM4_lock_sz
532#define NLM4_lockargs_sz NLM4_cookie_sz+4+NLM4_lock_sz
533#define NLM4_cancargs_sz NLM4_cookie_sz+2+NLM4_lock_sz
534#define NLM4_unlockargs_sz NLM4_cookie_sz+NLM4_lock_sz
535
536#define NLM4_testres_sz NLM4_cookie_sz+1+NLM4_holder_sz
537#define NLM4_res_sz NLM4_cookie_sz+1
538#define NLM4_norep_sz 0
539
540#ifndef MAX
541# define MAX(a,b) (((a) > (b))? (a) : (b))
542#endif
543
544/*
545 * For NLM, a void procedure really returns nothing
546 */
547#define nlm4clt_decode_norep NULL
548
549#define PROC(proc, argtype, restype) \
550[NLMPROC_##proc] = { \
551 .p_proc = NLMPROC_##proc, \
552 .p_encode = (kxdrproc_t) nlm4clt_encode_##argtype, \
553 .p_decode = (kxdrproc_t) nlm4clt_decode_##restype, \
Chuck Levercc0175c2006-03-20 13:44:22 -0500554 .p_bufsiz = MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2, \
555 .p_statidx = NLMPROC_##proc, \
556 .p_name = #proc, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 }
558
559static struct rpc_procinfo nlm4_procedures[] = {
560 PROC(TEST, testargs, testres),
561 PROC(LOCK, lockargs, res),
562 PROC(CANCEL, cancargs, res),
563 PROC(UNLOCK, unlockargs, res),
564 PROC(GRANTED, testargs, res),
565 PROC(TEST_MSG, testargs, norep),
566 PROC(LOCK_MSG, lockargs, norep),
567 PROC(CANCEL_MSG, cancargs, norep),
568 PROC(UNLOCK_MSG, unlockargs, norep),
569 PROC(GRANTED_MSG, testargs, norep),
570 PROC(TEST_RES, testres, norep),
571 PROC(LOCK_RES, res, norep),
572 PROC(CANCEL_RES, res, norep),
573 PROC(UNLOCK_RES, res, norep),
574 PROC(GRANTED_RES, res, norep),
575#ifdef NLMCLNT_SUPPORT_SHARES
576 PROC(SHARE, shareargs, shareres),
577 PROC(UNSHARE, shareargs, shareres),
578 PROC(NM_LOCK, lockargs, res),
579 PROC(FREE_ALL, notify, void),
580#endif
581};
582
583struct rpc_version nlm_version4 = {
584 .number = 4,
585 .nrprocs = 24,
586 .procs = nlm4_procedures,
587};