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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/svc4proc.c
4 *
5 * Lockd server procedures. We don't implement the NLM_*_RES
6 * procedures because we don't use the async procedures.
7 *
8 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 */
10
11#include <linux/types.h>
12#include <linux/time.h>
13#include <linux/lockd/lockd.h>
14#include <linux/lockd/share.h>
15#include <linux/sunrpc/svc_xprt.h>
16
17#define NLMDBG_FACILITY NLMDBG_CLIENT
18
19/*
20 * Obtain client and file from arguments
21 */
22static __be32
23nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
24 struct nlm_host **hostp, struct nlm_file **filp)
25{
26 struct nlm_host *host = NULL;
27 struct nlm_file *file = NULL;
28 struct nlm_lock *lock = &argp->lock;
29 __be32 error = 0;
30
31 /* nfsd callbacks must have been installed for this procedure */
32 if (!nlmsvc_ops)
33 return nlm_lck_denied_nolocks;
34
35 /* Obtain host handle */
36 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
37 || (argp->monitor && nsm_monitor(host) < 0))
38 goto no_locks;
39 *hostp = host;
40
41 /* Obtain file pointer. Not used by FREE_ALL call. */
42 if (filp != NULL) {
43 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
44 goto no_locks;
45 *filp = file;
46
47 /* Set up the missing parts of the file_lock structure */
48 lock->fl.fl_file = file->f_file;
49 lock->fl.fl_pid = current->tgid;
50 lock->fl.fl_lmops = &nlmsvc_lock_operations;
51 nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
52 if (!lock->fl.fl_owner) {
53 /* lockowner allocation has failed */
54 nlmsvc_release_host(host);
55 return nlm_lck_denied_nolocks;
56 }
57 }
58
59 return 0;
60
61no_locks:
62 nlmsvc_release_host(host);
63 if (error)
64 return error;
65 return nlm_lck_denied_nolocks;
66}
67
68/*
69 * NULL: Test for presence of service
70 */
71static __be32
72nlm4svc_proc_null(struct svc_rqst *rqstp)
73{
74 dprintk("lockd: NULL called\n");
75 return rpc_success;
76}
77
78/*
79 * TEST: Check for conflicting lock
80 */
81static __be32
82__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
83{
84 struct nlm_args *argp = rqstp->rq_argp;
85 struct nlm_host *host;
86 struct nlm_file *file;
87 __be32 rc = rpc_success;
88
89 dprintk("lockd: TEST4 called\n");
90 resp->cookie = argp->cookie;
91
92 /* Obtain client and file */
93 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
94 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
95
96 /* Now check for conflicting locks */
97 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
98 if (resp->status == nlm_drop_reply)
99 rc = rpc_drop_reply;
100 else
101 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
102
103 nlmsvc_release_lockowner(&argp->lock);
104 nlmsvc_release_host(host);
105 nlm_release_file(file);
106 return rc;
107}
108
109static __be32
110nlm4svc_proc_test(struct svc_rqst *rqstp)
111{
112 return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
113}
114
115static __be32
116__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
117{
118 struct nlm_args *argp = rqstp->rq_argp;
119 struct nlm_host *host;
120 struct nlm_file *file;
121 __be32 rc = rpc_success;
122
123 dprintk("lockd: LOCK called\n");
124
125 resp->cookie = argp->cookie;
126
127 /* Obtain client and file */
128 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
129 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
130
131#if 0
132 /* If supplied state doesn't match current state, we assume it's
133 * an old request that time-warped somehow. Any error return would
134 * do in this case because it's irrelevant anyway.
135 *
136 * NB: We don't retrieve the remote host's state yet.
137 */
138 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
139 resp->status = nlm_lck_denied_nolocks;
140 } else
141#endif
142
143 /* Now try to lock the file */
144 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
145 argp->block, &argp->cookie,
146 argp->reclaim);
147 if (resp->status == nlm_drop_reply)
148 rc = rpc_drop_reply;
149 else
150 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
151
152 nlmsvc_release_lockowner(&argp->lock);
153 nlmsvc_release_host(host);
154 nlm_release_file(file);
155 return rc;
156}
157
158static __be32
159nlm4svc_proc_lock(struct svc_rqst *rqstp)
160{
161 return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
162}
163
164static __be32
165__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
166{
167 struct nlm_args *argp = rqstp->rq_argp;
168 struct nlm_host *host;
169 struct nlm_file *file;
170
171 dprintk("lockd: CANCEL called\n");
172
173 resp->cookie = argp->cookie;
174
175 /* Don't accept requests during grace period */
176 if (locks_in_grace(SVC_NET(rqstp))) {
177 resp->status = nlm_lck_denied_grace_period;
178 return rpc_success;
179 }
180
181 /* Obtain client and file */
182 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
183 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
184
185 /* Try to cancel request. */
186 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
187
188 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
189 nlmsvc_release_lockowner(&argp->lock);
190 nlmsvc_release_host(host);
191 nlm_release_file(file);
192 return rpc_success;
193}
194
195static __be32
196nlm4svc_proc_cancel(struct svc_rqst *rqstp)
197{
198 return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
199}
200
201/*
202 * UNLOCK: release a lock
203 */
204static __be32
205__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
206{
207 struct nlm_args *argp = rqstp->rq_argp;
208 struct nlm_host *host;
209 struct nlm_file *file;
210
211 dprintk("lockd: UNLOCK called\n");
212
213 resp->cookie = argp->cookie;
214
215 /* Don't accept new lock requests during grace period */
216 if (locks_in_grace(SVC_NET(rqstp))) {
217 resp->status = nlm_lck_denied_grace_period;
218 return rpc_success;
219 }
220
221 /* Obtain client and file */
222 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
223 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
224
225 /* Now try to remove the lock */
226 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
227
228 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
229 nlmsvc_release_lockowner(&argp->lock);
230 nlmsvc_release_host(host);
231 nlm_release_file(file);
232 return rpc_success;
233}
234
235static __be32
236nlm4svc_proc_unlock(struct svc_rqst *rqstp)
237{
238 return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
239}
240
241/*
242 * GRANTED: A server calls us to tell that a process' lock request
243 * was granted
244 */
245static __be32
246__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
247{
248 struct nlm_args *argp = rqstp->rq_argp;
249
250 resp->cookie = argp->cookie;
251
252 dprintk("lockd: GRANTED called\n");
253 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
254 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
255 return rpc_success;
256}
257
258static __be32
259nlm4svc_proc_granted(struct svc_rqst *rqstp)
260{
261 return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
262}
263
264/*
265 * This is the generic lockd callback for async RPC calls
266 */
267static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
268{
269 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
270 -task->tk_status);
271}
272
273static void nlm4svc_callback_release(void *data)
274{
275 nlmsvc_release_call(data);
276}
277
278static const struct rpc_call_ops nlm4svc_callback_ops = {
279 .rpc_call_done = nlm4svc_callback_exit,
280 .rpc_release = nlm4svc_callback_release,
281};
282
283/*
284 * `Async' versions of the above service routines. They aren't really,
285 * because we send the callback before the reply proper. I hope this
286 * doesn't break any clients.
287 */
288static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
289 __be32 (*func)(struct svc_rqst *, struct nlm_res *))
290{
291 struct nlm_args *argp = rqstp->rq_argp;
292 struct nlm_host *host;
293 struct nlm_rqst *call;
294 __be32 stat;
295
296 host = nlmsvc_lookup_host(rqstp,
297 argp->lock.caller,
298 argp->lock.len);
299 if (host == NULL)
300 return rpc_system_err;
301
302 call = nlm_alloc_call(host);
303 nlmsvc_release_host(host);
304 if (call == NULL)
305 return rpc_system_err;
306
307 stat = func(rqstp, &call->a_res);
308 if (stat != 0) {
309 nlmsvc_release_call(call);
310 return stat;
311 }
312
313 call->a_flags = RPC_TASK_ASYNC;
314 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
315 return rpc_system_err;
316 return rpc_success;
317}
318
319static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
320{
321 dprintk("lockd: TEST_MSG called\n");
322 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
323}
324
325static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
326{
327 dprintk("lockd: LOCK_MSG called\n");
328 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
329}
330
331static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
332{
333 dprintk("lockd: CANCEL_MSG called\n");
334 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
335}
336
337static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
338{
339 dprintk("lockd: UNLOCK_MSG called\n");
340 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
341}
342
343static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
344{
345 dprintk("lockd: GRANTED_MSG called\n");
346 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
347}
348
349/*
350 * SHARE: create a DOS share or alter existing share.
351 */
352static __be32
353nlm4svc_proc_share(struct svc_rqst *rqstp)
354{
355 struct nlm_args *argp = rqstp->rq_argp;
356 struct nlm_res *resp = rqstp->rq_resp;
357 struct nlm_host *host;
358 struct nlm_file *file;
359
360 dprintk("lockd: SHARE called\n");
361
362 resp->cookie = argp->cookie;
363
364 /* Don't accept new lock requests during grace period */
365 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
366 resp->status = nlm_lck_denied_grace_period;
367 return rpc_success;
368 }
369
370 /* Obtain client and file */
371 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
372 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
373
374 /* Now try to create the share */
375 resp->status = nlmsvc_share_file(host, file, argp);
376
377 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
378 nlmsvc_release_lockowner(&argp->lock);
379 nlmsvc_release_host(host);
380 nlm_release_file(file);
381 return rpc_success;
382}
383
384/*
385 * UNSHARE: Release a DOS share.
386 */
387static __be32
388nlm4svc_proc_unshare(struct svc_rqst *rqstp)
389{
390 struct nlm_args *argp = rqstp->rq_argp;
391 struct nlm_res *resp = rqstp->rq_resp;
392 struct nlm_host *host;
393 struct nlm_file *file;
394
395 dprintk("lockd: UNSHARE called\n");
396
397 resp->cookie = argp->cookie;
398
399 /* Don't accept requests during grace period */
400 if (locks_in_grace(SVC_NET(rqstp))) {
401 resp->status = nlm_lck_denied_grace_period;
402 return rpc_success;
403 }
404
405 /* Obtain client and file */
406 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
407 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
408
409 /* Now try to lock the file */
410 resp->status = nlmsvc_unshare_file(host, file, argp);
411
412 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
413 nlmsvc_release_lockowner(&argp->lock);
414 nlmsvc_release_host(host);
415 nlm_release_file(file);
416 return rpc_success;
417}
418
419/*
420 * NM_LOCK: Create an unmonitored lock
421 */
422static __be32
423nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
424{
425 struct nlm_args *argp = rqstp->rq_argp;
426
427 dprintk("lockd: NM_LOCK called\n");
428
429 argp->monitor = 0; /* just clean the monitor flag */
430 return nlm4svc_proc_lock(rqstp);
431}
432
433/*
434 * FREE_ALL: Release all locks and shares held by client
435 */
436static __be32
437nlm4svc_proc_free_all(struct svc_rqst *rqstp)
438{
439 struct nlm_args *argp = rqstp->rq_argp;
440 struct nlm_host *host;
441
442 /* Obtain client */
443 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
444 return rpc_success;
445
446 nlmsvc_free_host_resources(host);
447 nlmsvc_release_host(host);
448 return rpc_success;
449}
450
451/*
452 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
453 */
454static __be32
455nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
456{
457 struct nlm_reboot *argp = rqstp->rq_argp;
458
459 dprintk("lockd: SM_NOTIFY called\n");
460
461 if (!nlm_privileged_requester(rqstp)) {
462 char buf[RPC_MAX_ADDRBUFLEN];
463 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
464 svc_print_addr(rqstp, buf, sizeof(buf)));
465 return rpc_system_err;
466 }
467
468 nlm_host_rebooted(SVC_NET(rqstp), argp);
469 return rpc_success;
470}
471
472/*
473 * client sent a GRANTED_RES, let's remove the associated block
474 */
475static __be32
476nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
477{
478 struct nlm_res *argp = rqstp->rq_argp;
479
480 if (!nlmsvc_ops)
481 return rpc_success;
482
483 dprintk("lockd: GRANTED_RES called\n");
484
485 nlmsvc_grant_reply(&argp->cookie, argp->status);
486 return rpc_success;
487}
488
489static __be32
490nlm4svc_proc_unused(struct svc_rqst *rqstp)
491{
492 return rpc_proc_unavail;
493}
494
495
496/*
497 * NLM Server procedures.
498 */
499
500struct nlm_void { int dummy; };
501
502#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
503#define No (1+1024/4) /* netobj */
504#define St 1 /* status */
505#define Rg 4 /* range (offset + length) */
506
507const struct svc_procedure nlmsvc_procedures4[24] = {
508 [NLMPROC_NULL] = {
509 .pc_func = nlm4svc_proc_null,
510 .pc_decode = nlm4svc_decode_void,
511 .pc_encode = nlm4svc_encode_void,
512 .pc_argsize = sizeof(struct nlm_void),
513 .pc_ressize = sizeof(struct nlm_void),
514 .pc_xdrressize = St,
515 .pc_name = "NULL",
516 },
517 [NLMPROC_TEST] = {
518 .pc_func = nlm4svc_proc_test,
519 .pc_decode = nlm4svc_decode_testargs,
520 .pc_encode = nlm4svc_encode_testres,
521 .pc_argsize = sizeof(struct nlm_args),
522 .pc_ressize = sizeof(struct nlm_res),
523 .pc_xdrressize = Ck+St+2+No+Rg,
524 .pc_name = "TEST",
525 },
526 [NLMPROC_LOCK] = {
527 .pc_func = nlm4svc_proc_lock,
528 .pc_decode = nlm4svc_decode_lockargs,
529 .pc_encode = nlm4svc_encode_res,
530 .pc_argsize = sizeof(struct nlm_args),
531 .pc_ressize = sizeof(struct nlm_res),
532 .pc_xdrressize = Ck+St,
533 .pc_name = "LOCK",
534 },
535 [NLMPROC_CANCEL] = {
536 .pc_func = nlm4svc_proc_cancel,
537 .pc_decode = nlm4svc_decode_cancargs,
538 .pc_encode = nlm4svc_encode_res,
539 .pc_argsize = sizeof(struct nlm_args),
540 .pc_ressize = sizeof(struct nlm_res),
541 .pc_xdrressize = Ck+St,
542 .pc_name = "CANCEL",
543 },
544 [NLMPROC_UNLOCK] = {
545 .pc_func = nlm4svc_proc_unlock,
546 .pc_decode = nlm4svc_decode_unlockargs,
547 .pc_encode = nlm4svc_encode_res,
548 .pc_argsize = sizeof(struct nlm_args),
549 .pc_ressize = sizeof(struct nlm_res),
550 .pc_xdrressize = Ck+St,
551 .pc_name = "UNLOCK",
552 },
553 [NLMPROC_GRANTED] = {
554 .pc_func = nlm4svc_proc_granted,
555 .pc_decode = nlm4svc_decode_testargs,
556 .pc_encode = nlm4svc_encode_res,
557 .pc_argsize = sizeof(struct nlm_args),
558 .pc_ressize = sizeof(struct nlm_res),
559 .pc_xdrressize = Ck+St,
560 .pc_name = "GRANTED",
561 },
562 [NLMPROC_TEST_MSG] = {
563 .pc_func = nlm4svc_proc_test_msg,
564 .pc_decode = nlm4svc_decode_testargs,
565 .pc_encode = nlm4svc_encode_void,
566 .pc_argsize = sizeof(struct nlm_args),
567 .pc_ressize = sizeof(struct nlm_void),
568 .pc_xdrressize = St,
569 .pc_name = "TEST_MSG",
570 },
571 [NLMPROC_LOCK_MSG] = {
572 .pc_func = nlm4svc_proc_lock_msg,
573 .pc_decode = nlm4svc_decode_lockargs,
574 .pc_encode = nlm4svc_encode_void,
575 .pc_argsize = sizeof(struct nlm_args),
576 .pc_ressize = sizeof(struct nlm_void),
577 .pc_xdrressize = St,
578 .pc_name = "LOCK_MSG",
579 },
580 [NLMPROC_CANCEL_MSG] = {
581 .pc_func = nlm4svc_proc_cancel_msg,
582 .pc_decode = nlm4svc_decode_cancargs,
583 .pc_encode = nlm4svc_encode_void,
584 .pc_argsize = sizeof(struct nlm_args),
585 .pc_ressize = sizeof(struct nlm_void),
586 .pc_xdrressize = St,
587 .pc_name = "CANCEL_MSG",
588 },
589 [NLMPROC_UNLOCK_MSG] = {
590 .pc_func = nlm4svc_proc_unlock_msg,
591 .pc_decode = nlm4svc_decode_unlockargs,
592 .pc_encode = nlm4svc_encode_void,
593 .pc_argsize = sizeof(struct nlm_args),
594 .pc_ressize = sizeof(struct nlm_void),
595 .pc_xdrressize = St,
596 .pc_name = "UNLOCK_MSG",
597 },
598 [NLMPROC_GRANTED_MSG] = {
599 .pc_func = nlm4svc_proc_granted_msg,
600 .pc_decode = nlm4svc_decode_testargs,
601 .pc_encode = nlm4svc_encode_void,
602 .pc_argsize = sizeof(struct nlm_args),
603 .pc_ressize = sizeof(struct nlm_void),
604 .pc_xdrressize = St,
605 .pc_name = "GRANTED_MSG",
606 },
607 [NLMPROC_TEST_RES] = {
608 .pc_func = nlm4svc_proc_null,
609 .pc_decode = nlm4svc_decode_void,
610 .pc_encode = nlm4svc_encode_void,
611 .pc_argsize = sizeof(struct nlm_res),
612 .pc_ressize = sizeof(struct nlm_void),
613 .pc_xdrressize = St,
614 .pc_name = "TEST_RES",
615 },
616 [NLMPROC_LOCK_RES] = {
617 .pc_func = nlm4svc_proc_null,
618 .pc_decode = nlm4svc_decode_void,
619 .pc_encode = nlm4svc_encode_void,
620 .pc_argsize = sizeof(struct nlm_res),
621 .pc_ressize = sizeof(struct nlm_void),
622 .pc_xdrressize = St,
623 .pc_name = "LOCK_RES",
624 },
625 [NLMPROC_CANCEL_RES] = {
626 .pc_func = nlm4svc_proc_null,
627 .pc_decode = nlm4svc_decode_void,
628 .pc_encode = nlm4svc_encode_void,
629 .pc_argsize = sizeof(struct nlm_res),
630 .pc_ressize = sizeof(struct nlm_void),
631 .pc_xdrressize = St,
632 .pc_name = "CANCEL_RES",
633 },
634 [NLMPROC_UNLOCK_RES] = {
635 .pc_func = nlm4svc_proc_null,
636 .pc_decode = nlm4svc_decode_void,
637 .pc_encode = nlm4svc_encode_void,
638 .pc_argsize = sizeof(struct nlm_res),
639 .pc_ressize = sizeof(struct nlm_void),
640 .pc_xdrressize = St,
641 .pc_name = "UNLOCK_RES",
642 },
643 [NLMPROC_GRANTED_RES] = {
644 .pc_func = nlm4svc_proc_granted_res,
645 .pc_decode = nlm4svc_decode_res,
646 .pc_encode = nlm4svc_encode_void,
647 .pc_argsize = sizeof(struct nlm_res),
648 .pc_ressize = sizeof(struct nlm_void),
649 .pc_xdrressize = St,
650 .pc_name = "GRANTED_RES",
651 },
652 [NLMPROC_NSM_NOTIFY] = {
653 .pc_func = nlm4svc_proc_sm_notify,
654 .pc_decode = nlm4svc_decode_reboot,
655 .pc_encode = nlm4svc_encode_void,
656 .pc_argsize = sizeof(struct nlm_reboot),
657 .pc_ressize = sizeof(struct nlm_void),
658 .pc_xdrressize = St,
659 .pc_name = "SM_NOTIFY",
660 },
661 [17] = {
662 .pc_func = nlm4svc_proc_unused,
663 .pc_decode = nlm4svc_decode_void,
664 .pc_encode = nlm4svc_encode_void,
665 .pc_argsize = sizeof(struct nlm_void),
666 .pc_ressize = sizeof(struct nlm_void),
667 .pc_xdrressize = 0,
668 .pc_name = "UNUSED",
669 },
670 [18] = {
671 .pc_func = nlm4svc_proc_unused,
672 .pc_decode = nlm4svc_decode_void,
673 .pc_encode = nlm4svc_encode_void,
674 .pc_argsize = sizeof(struct nlm_void),
675 .pc_ressize = sizeof(struct nlm_void),
676 .pc_xdrressize = 0,
677 .pc_name = "UNUSED",
678 },
679 [19] = {
680 .pc_func = nlm4svc_proc_unused,
681 .pc_decode = nlm4svc_decode_void,
682 .pc_encode = nlm4svc_encode_void,
683 .pc_argsize = sizeof(struct nlm_void),
684 .pc_ressize = sizeof(struct nlm_void),
685 .pc_xdrressize = 0,
686 .pc_name = "UNUSED",
687 },
688 [NLMPROC_SHARE] = {
689 .pc_func = nlm4svc_proc_share,
690 .pc_decode = nlm4svc_decode_shareargs,
691 .pc_encode = nlm4svc_encode_shareres,
692 .pc_argsize = sizeof(struct nlm_args),
693 .pc_ressize = sizeof(struct nlm_res),
694 .pc_xdrressize = Ck+St+1,
695 .pc_name = "SHARE",
696 },
697 [NLMPROC_UNSHARE] = {
698 .pc_func = nlm4svc_proc_unshare,
699 .pc_decode = nlm4svc_decode_shareargs,
700 .pc_encode = nlm4svc_encode_shareres,
701 .pc_argsize = sizeof(struct nlm_args),
702 .pc_ressize = sizeof(struct nlm_res),
703 .pc_xdrressize = Ck+St+1,
704 .pc_name = "UNSHARE",
705 },
706 [NLMPROC_NM_LOCK] = {
707 .pc_func = nlm4svc_proc_nm_lock,
708 .pc_decode = nlm4svc_decode_lockargs,
709 .pc_encode = nlm4svc_encode_res,
710 .pc_argsize = sizeof(struct nlm_args),
711 .pc_ressize = sizeof(struct nlm_res),
712 .pc_xdrressize = Ck+St,
713 .pc_name = "NM_LOCK",
714 },
715 [NLMPROC_FREE_ALL] = {
716 .pc_func = nlm4svc_proc_free_all,
717 .pc_decode = nlm4svc_decode_notify,
718 .pc_encode = nlm4svc_encode_void,
719 .pc_argsize = sizeof(struct nlm_args),
720 .pc_ressize = sizeof(struct nlm_void),
721 .pc_xdrressize = St,
722 .pc_name = "FREE_ALL",
723 },
724};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/lockd/svc4proc.c
4 *
5 * Lockd server procedures. We don't implement the NLM_*_RES
6 * procedures because we don't use the async procedures.
7 *
8 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 */
10
11#include <linux/types.h>
12#include <linux/time.h>
13#include <linux/lockd/lockd.h>
14#include <linux/lockd/share.h>
15#include <linux/sunrpc/svc_xprt.h>
16
17#define NLMDBG_FACILITY NLMDBG_CLIENT
18
19/*
20 * Obtain client and file from arguments
21 */
22static __be32
23nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
24 struct nlm_host **hostp, struct nlm_file **filp)
25{
26 struct nlm_host *host = NULL;
27 struct nlm_file *file = NULL;
28 struct nlm_lock *lock = &argp->lock;
29 __be32 error = 0;
30
31 /* nfsd callbacks must have been installed for this procedure */
32 if (!nlmsvc_ops)
33 return nlm_lck_denied_nolocks;
34
35 /* Obtain host handle */
36 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
37 || (argp->monitor && nsm_monitor(host) < 0))
38 goto no_locks;
39 *hostp = host;
40
41 /* Obtain file pointer. Not used by FREE_ALL call. */
42 if (filp != NULL) {
43 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
44 goto no_locks;
45 *filp = file;
46
47 /* Set up the missing parts of the file_lock structure */
48 lock->fl.fl_file = file->f_file;
49 lock->fl.fl_owner = (fl_owner_t) host;
50 lock->fl.fl_lmops = &nlmsvc_lock_operations;
51 }
52
53 return 0;
54
55no_locks:
56 nlmsvc_release_host(host);
57 if (error)
58 return error;
59 return nlm_lck_denied_nolocks;
60}
61
62/*
63 * NULL: Test for presence of service
64 */
65static __be32
66nlm4svc_proc_null(struct svc_rqst *rqstp)
67{
68 dprintk("lockd: NULL called\n");
69 return rpc_success;
70}
71
72/*
73 * TEST: Check for conflicting lock
74 */
75static __be32
76__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
77{
78 struct nlm_args *argp = rqstp->rq_argp;
79 struct nlm_host *host;
80 struct nlm_file *file;
81 __be32 rc = rpc_success;
82
83 dprintk("lockd: TEST4 called\n");
84 resp->cookie = argp->cookie;
85
86 /* Obtain client and file */
87 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
88 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
89
90 /* Now check for conflicting locks */
91 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
92 if (resp->status == nlm_drop_reply)
93 rc = rpc_drop_reply;
94 else
95 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
96
97 nlmsvc_release_host(host);
98 nlm_release_file(file);
99 return rc;
100}
101
102static __be32
103nlm4svc_proc_test(struct svc_rqst *rqstp)
104{
105 return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
106}
107
108static __be32
109__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
110{
111 struct nlm_args *argp = rqstp->rq_argp;
112 struct nlm_host *host;
113 struct nlm_file *file;
114 __be32 rc = rpc_success;
115
116 dprintk("lockd: LOCK called\n");
117
118 resp->cookie = argp->cookie;
119
120 /* Obtain client and file */
121 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
122 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
123
124#if 0
125 /* If supplied state doesn't match current state, we assume it's
126 * an old request that time-warped somehow. Any error return would
127 * do in this case because it's irrelevant anyway.
128 *
129 * NB: We don't retrieve the remote host's state yet.
130 */
131 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
132 resp->status = nlm_lck_denied_nolocks;
133 } else
134#endif
135
136 /* Now try to lock the file */
137 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
138 argp->block, &argp->cookie,
139 argp->reclaim);
140 if (resp->status == nlm_drop_reply)
141 rc = rpc_drop_reply;
142 else
143 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
144
145 nlmsvc_release_host(host);
146 nlm_release_file(file);
147 return rc;
148}
149
150static __be32
151nlm4svc_proc_lock(struct svc_rqst *rqstp)
152{
153 return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
154}
155
156static __be32
157__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
158{
159 struct nlm_args *argp = rqstp->rq_argp;
160 struct nlm_host *host;
161 struct nlm_file *file;
162
163 dprintk("lockd: CANCEL called\n");
164
165 resp->cookie = argp->cookie;
166
167 /* Don't accept requests during grace period */
168 if (locks_in_grace(SVC_NET(rqstp))) {
169 resp->status = nlm_lck_denied_grace_period;
170 return rpc_success;
171 }
172
173 /* Obtain client and file */
174 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
175 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
176
177 /* Try to cancel request. */
178 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
179
180 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
181 nlmsvc_release_host(host);
182 nlm_release_file(file);
183 return rpc_success;
184}
185
186static __be32
187nlm4svc_proc_cancel(struct svc_rqst *rqstp)
188{
189 return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
190}
191
192/*
193 * UNLOCK: release a lock
194 */
195static __be32
196__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
197{
198 struct nlm_args *argp = rqstp->rq_argp;
199 struct nlm_host *host;
200 struct nlm_file *file;
201
202 dprintk("lockd: UNLOCK called\n");
203
204 resp->cookie = argp->cookie;
205
206 /* Don't accept new lock requests during grace period */
207 if (locks_in_grace(SVC_NET(rqstp))) {
208 resp->status = nlm_lck_denied_grace_period;
209 return rpc_success;
210 }
211
212 /* Obtain client and file */
213 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
214 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
215
216 /* Now try to remove the lock */
217 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
218
219 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
220 nlmsvc_release_host(host);
221 nlm_release_file(file);
222 return rpc_success;
223}
224
225static __be32
226nlm4svc_proc_unlock(struct svc_rqst *rqstp)
227{
228 return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
229}
230
231/*
232 * GRANTED: A server calls us to tell that a process' lock request
233 * was granted
234 */
235static __be32
236__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
237{
238 struct nlm_args *argp = rqstp->rq_argp;
239
240 resp->cookie = argp->cookie;
241
242 dprintk("lockd: GRANTED called\n");
243 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
244 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
245 return rpc_success;
246}
247
248static __be32
249nlm4svc_proc_granted(struct svc_rqst *rqstp)
250{
251 return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
252}
253
254/*
255 * This is the generic lockd callback for async RPC calls
256 */
257static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
258{
259 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
260 -task->tk_status);
261}
262
263static void nlm4svc_callback_release(void *data)
264{
265 nlmsvc_release_call(data);
266}
267
268static const struct rpc_call_ops nlm4svc_callback_ops = {
269 .rpc_call_done = nlm4svc_callback_exit,
270 .rpc_release = nlm4svc_callback_release,
271};
272
273/*
274 * `Async' versions of the above service routines. They aren't really,
275 * because we send the callback before the reply proper. I hope this
276 * doesn't break any clients.
277 */
278static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
279 __be32 (*func)(struct svc_rqst *, struct nlm_res *))
280{
281 struct nlm_args *argp = rqstp->rq_argp;
282 struct nlm_host *host;
283 struct nlm_rqst *call;
284 __be32 stat;
285
286 host = nlmsvc_lookup_host(rqstp,
287 argp->lock.caller,
288 argp->lock.len);
289 if (host == NULL)
290 return rpc_system_err;
291
292 call = nlm_alloc_call(host);
293 nlmsvc_release_host(host);
294 if (call == NULL)
295 return rpc_system_err;
296
297 stat = func(rqstp, &call->a_res);
298 if (stat != 0) {
299 nlmsvc_release_call(call);
300 return stat;
301 }
302
303 call->a_flags = RPC_TASK_ASYNC;
304 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
305 return rpc_system_err;
306 return rpc_success;
307}
308
309static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
310{
311 dprintk("lockd: TEST_MSG called\n");
312 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
313}
314
315static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
316{
317 dprintk("lockd: LOCK_MSG called\n");
318 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
319}
320
321static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
322{
323 dprintk("lockd: CANCEL_MSG called\n");
324 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
325}
326
327static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
328{
329 dprintk("lockd: UNLOCK_MSG called\n");
330 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
331}
332
333static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
334{
335 dprintk("lockd: GRANTED_MSG called\n");
336 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
337}
338
339/*
340 * SHARE: create a DOS share or alter existing share.
341 */
342static __be32
343nlm4svc_proc_share(struct svc_rqst *rqstp)
344{
345 struct nlm_args *argp = rqstp->rq_argp;
346 struct nlm_res *resp = rqstp->rq_resp;
347 struct nlm_host *host;
348 struct nlm_file *file;
349
350 dprintk("lockd: SHARE called\n");
351
352 resp->cookie = argp->cookie;
353
354 /* Don't accept new lock requests during grace period */
355 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
356 resp->status = nlm_lck_denied_grace_period;
357 return rpc_success;
358 }
359
360 /* Obtain client and file */
361 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
362 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
363
364 /* Now try to create the share */
365 resp->status = nlmsvc_share_file(host, file, argp);
366
367 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
368 nlmsvc_release_host(host);
369 nlm_release_file(file);
370 return rpc_success;
371}
372
373/*
374 * UNSHARE: Release a DOS share.
375 */
376static __be32
377nlm4svc_proc_unshare(struct svc_rqst *rqstp)
378{
379 struct nlm_args *argp = rqstp->rq_argp;
380 struct nlm_res *resp = rqstp->rq_resp;
381 struct nlm_host *host;
382 struct nlm_file *file;
383
384 dprintk("lockd: UNSHARE called\n");
385
386 resp->cookie = argp->cookie;
387
388 /* Don't accept requests during grace period */
389 if (locks_in_grace(SVC_NET(rqstp))) {
390 resp->status = nlm_lck_denied_grace_period;
391 return rpc_success;
392 }
393
394 /* Obtain client and file */
395 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
396 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
397
398 /* Now try to lock the file */
399 resp->status = nlmsvc_unshare_file(host, file, argp);
400
401 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
402 nlmsvc_release_host(host);
403 nlm_release_file(file);
404 return rpc_success;
405}
406
407/*
408 * NM_LOCK: Create an unmonitored lock
409 */
410static __be32
411nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
412{
413 struct nlm_args *argp = rqstp->rq_argp;
414
415 dprintk("lockd: NM_LOCK called\n");
416
417 argp->monitor = 0; /* just clean the monitor flag */
418 return nlm4svc_proc_lock(rqstp);
419}
420
421/*
422 * FREE_ALL: Release all locks and shares held by client
423 */
424static __be32
425nlm4svc_proc_free_all(struct svc_rqst *rqstp)
426{
427 struct nlm_args *argp = rqstp->rq_argp;
428 struct nlm_host *host;
429
430 /* Obtain client */
431 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
432 return rpc_success;
433
434 nlmsvc_free_host_resources(host);
435 nlmsvc_release_host(host);
436 return rpc_success;
437}
438
439/*
440 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
441 */
442static __be32
443nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
444{
445 struct nlm_reboot *argp = rqstp->rq_argp;
446
447 dprintk("lockd: SM_NOTIFY called\n");
448
449 if (!nlm_privileged_requester(rqstp)) {
450 char buf[RPC_MAX_ADDRBUFLEN];
451 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
452 svc_print_addr(rqstp, buf, sizeof(buf)));
453 return rpc_system_err;
454 }
455
456 nlm_host_rebooted(SVC_NET(rqstp), argp);
457 return rpc_success;
458}
459
460/*
461 * client sent a GRANTED_RES, let's remove the associated block
462 */
463static __be32
464nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
465{
466 struct nlm_res *argp = rqstp->rq_argp;
467
468 if (!nlmsvc_ops)
469 return rpc_success;
470
471 dprintk("lockd: GRANTED_RES called\n");
472
473 nlmsvc_grant_reply(&argp->cookie, argp->status);
474 return rpc_success;
475}
476
477
478/*
479 * NLM Server procedures.
480 */
481
482#define nlm4svc_encode_norep nlm4svc_encode_void
483#define nlm4svc_decode_norep nlm4svc_decode_void
484#define nlm4svc_decode_testres nlm4svc_decode_void
485#define nlm4svc_decode_lockres nlm4svc_decode_void
486#define nlm4svc_decode_unlockres nlm4svc_decode_void
487#define nlm4svc_decode_cancelres nlm4svc_decode_void
488#define nlm4svc_decode_grantedres nlm4svc_decode_void
489
490#define nlm4svc_proc_none nlm4svc_proc_null
491#define nlm4svc_proc_test_res nlm4svc_proc_null
492#define nlm4svc_proc_lock_res nlm4svc_proc_null
493#define nlm4svc_proc_cancel_res nlm4svc_proc_null
494#define nlm4svc_proc_unlock_res nlm4svc_proc_null
495
496struct nlm_void { int dummy; };
497
498#define PROC(name, xargt, xrest, argt, rest, respsize) \
499 { .pc_func = nlm4svc_proc_##name, \
500 .pc_decode = nlm4svc_decode_##xargt, \
501 .pc_encode = nlm4svc_encode_##xrest, \
502 .pc_release = NULL, \
503 .pc_argsize = sizeof(struct nlm_##argt), \
504 .pc_ressize = sizeof(struct nlm_##rest), \
505 .pc_xdrressize = respsize, \
506 }
507#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
508#define No (1+1024/4) /* netobj */
509#define St 1 /* status */
510#define Rg 4 /* range (offset + length) */
511const struct svc_procedure nlmsvc_procedures4[] = {
512 PROC(null, void, void, void, void, 1),
513 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
514 PROC(lock, lockargs, res, args, res, Ck+St),
515 PROC(cancel, cancargs, res, args, res, Ck+St),
516 PROC(unlock, unlockargs, res, args, res, Ck+St),
517 PROC(granted, testargs, res, args, res, Ck+St),
518 PROC(test_msg, testargs, norep, args, void, 1),
519 PROC(lock_msg, lockargs, norep, args, void, 1),
520 PROC(cancel_msg, cancargs, norep, args, void, 1),
521 PROC(unlock_msg, unlockargs, norep, args, void, 1),
522 PROC(granted_msg, testargs, norep, args, void, 1),
523 PROC(test_res, testres, norep, res, void, 1),
524 PROC(lock_res, lockres, norep, res, void, 1),
525 PROC(cancel_res, cancelres, norep, res, void, 1),
526 PROC(unlock_res, unlockres, norep, res, void, 1),
527 PROC(granted_res, res, norep, res, void, 1),
528 /* statd callback */
529 PROC(sm_notify, reboot, void, reboot, void, 1),
530 PROC(none, void, void, void, void, 0),
531 PROC(none, void, void, void, void, 0),
532 PROC(none, void, void, void, void, 0),
533 PROC(share, shareargs, shareres, args, res, Ck+St+1),
534 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
535 PROC(nm_lock, lockargs, res, args, res, Ck+St),
536 PROC(free_all, notify, void, args, void, 1),
537
538};