xref: /linux/fs/lockd/xdr4.c (revision 367b8112fe2ea5c39a7bb4d263dcdd9b612fae18) 
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 	return xdr_argsize_check(rqstp, p);
362 }
363 
364 int
365 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
366 {
367 	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
368 		return 0;
369 	resp->status = *p++;
370 	return xdr_argsize_check(rqstp, p);
371 }
372 
373 int
374 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
375 {
376 	return xdr_argsize_check(rqstp, p);
377 }
378 
379 int
380 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
381 {
382 	return xdr_ressize_check(rqstp, p);
383 }
384 
385 /*
386  * Now, the client side XDR functions
387  */
388 #ifdef NLMCLNT_SUPPORT_SHARES
389 static int
390 nlm4clt_decode_void(struct rpc_rqst *req, __be32 *p, void *ptr)
391 {
392 	return 0;
393 }
394 #endif
395 
396 static int
397 nlm4clt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
398 {
399 	struct nlm_lock	*lock = &argp->lock;
400 
401 	if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
402 		return -EIO;
403 	*p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
404 	if (!(p = nlm4_encode_lock(p, lock)))
405 		return -EIO;
406 	req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
407 	return 0;
408 }
409 
410 static int
411 nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
412 {
413 	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
414 		return -EIO;
415 	resp->status = *p++;
416 	if (resp->status == nlm_lck_denied) {
417 		struct file_lock	*fl = &resp->lock.fl;
418 		u32			excl;
419 		__u64			start, len;
420 		__s64			end;
421 
422 		memset(&resp->lock, 0, sizeof(resp->lock));
423 		locks_init_lock(fl);
424 		excl = ntohl(*p++);
425 		resp->lock.svid = ntohl(*p++);
426 		fl->fl_pid = (pid_t)resp->lock.svid;
427 		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 
446 static int
447 nlm4clt_encode_lockargs(struct rpc_rqst *req, __be32 *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 
463 static int
464 nlm4clt_encode_cancargs(struct rpc_rqst *req, __be32 *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 
478 static int
479 nlm4clt_encode_unlockargs(struct rpc_rqst *req, __be32 *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 
491 static int
492 nlm4clt_encode_res(struct rpc_rqst *req, __be32 *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 
501 static int
502 nlm4clt_encode_testres(struct rpc_rqst *req, __be32 *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 
510 static int
511 nlm4clt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
512 {
513 	if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
514 		return -EIO;
515 	resp->status = *p++;
516 	return 0;
517 }
518 
519 #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
520 #  error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
521 #endif
522 
523 #if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
524 #  error "NLM host name cannot be larger than NLM's maximum string length!"
525 #endif
526 
527 /*
528  * Buffer requirements for NLM
529  */
530 #define NLM4_void_sz		0
531 #define NLM4_cookie_sz		1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
532 #define NLM4_caller_sz		1+XDR_QUADLEN(NLMCLNT_OHSIZE)
533 #define NLM4_owner_sz		1+XDR_QUADLEN(NLMCLNT_OHSIZE)
534 #define NLM4_fhandle_sz		1+XDR_QUADLEN(NFS3_FHSIZE)
535 #define NLM4_lock_sz		5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz
536 #define NLM4_holder_sz		6+NLM4_owner_sz
537 
538 #define NLM4_testargs_sz	NLM4_cookie_sz+1+NLM4_lock_sz
539 #define NLM4_lockargs_sz	NLM4_cookie_sz+4+NLM4_lock_sz
540 #define NLM4_cancargs_sz	NLM4_cookie_sz+2+NLM4_lock_sz
541 #define NLM4_unlockargs_sz	NLM4_cookie_sz+NLM4_lock_sz
542 
543 #define NLM4_testres_sz		NLM4_cookie_sz+1+NLM4_holder_sz
544 #define NLM4_res_sz		NLM4_cookie_sz+1
545 #define NLM4_norep_sz		0
546 
547 /*
548  * For NLM, a void procedure really returns nothing
549  */
550 #define nlm4clt_decode_norep	NULL
551 
552 #define PROC(proc, argtype, restype)					\
553 [NLMPROC_##proc] = {							\
554 	.p_proc      = NLMPROC_##proc,					\
555 	.p_encode    = (kxdrproc_t) nlm4clt_encode_##argtype,		\
556 	.p_decode    = (kxdrproc_t) nlm4clt_decode_##restype,		\
557 	.p_arglen    = NLM4_##argtype##_sz,				\
558 	.p_replen    = NLM4_##restype##_sz,				\
559 	.p_statidx   = NLMPROC_##proc,					\
560 	.p_name      = #proc,						\
561 	}
562 
563 static struct rpc_procinfo	nlm4_procedures[] = {
564     PROC(TEST,		testargs,	testres),
565     PROC(LOCK,		lockargs,	res),
566     PROC(CANCEL,	cancargs,	res),
567     PROC(UNLOCK,	unlockargs,	res),
568     PROC(GRANTED,	testargs,	res),
569     PROC(TEST_MSG,	testargs,	norep),
570     PROC(LOCK_MSG,	lockargs,	norep),
571     PROC(CANCEL_MSG,	cancargs,	norep),
572     PROC(UNLOCK_MSG,	unlockargs,	norep),
573     PROC(GRANTED_MSG,	testargs,	norep),
574     PROC(TEST_RES,	testres,	norep),
575     PROC(LOCK_RES,	res,		norep),
576     PROC(CANCEL_RES,	res,		norep),
577     PROC(UNLOCK_RES,	res,		norep),
578     PROC(GRANTED_RES,	res,		norep),
579 #ifdef NLMCLNT_SUPPORT_SHARES
580     PROC(SHARE,		shareargs,	shareres),
581     PROC(UNSHARE,	shareargs,	shareres),
582     PROC(NM_LOCK,	lockargs,	res),
583     PROC(FREE_ALL,	notify,		void),
584 #endif
585 };
586 
587 struct rpc_version	nlm_version4 = {
588 	.number		= 4,
589 	.nrprocs	= 24,
590 	.procs		= nlm4_procedures,
591 };
592