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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_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};
1/*
2 * linux/fs/lockd/svc4proc.c
3 *
4 * Lockd server procedures. We don't implement the NLM_*_RES
5 * procedures because we don't use the async procedures.
6 *
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
8 */
9
10#include <linux/types.h>
11#include <linux/time.h>
12#include <linux/lockd/lockd.h>
13#include <linux/lockd/share.h>
14#include <linux/sunrpc/svc_xprt.h>
15
16#define NLMDBG_FACILITY NLMDBG_CLIENT
17
18/*
19 * Obtain client and file from arguments
20 */
21static __be32
22nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
23 struct nlm_host **hostp, struct nlm_file **filp)
24{
25 struct nlm_host *host = NULL;
26 struct nlm_file *file = NULL;
27 struct nlm_lock *lock = &argp->lock;
28 __be32 error = 0;
29
30 /* nfsd callbacks must have been installed for this procedure */
31 if (!nlmsvc_ops)
32 return nlm_lck_denied_nolocks;
33
34 /* Obtain host handle */
35 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
36 || (argp->monitor && nsm_monitor(host) < 0))
37 goto no_locks;
38 *hostp = host;
39
40 /* Obtain file pointer. Not used by FREE_ALL call. */
41 if (filp != NULL) {
42 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
43 goto no_locks;
44 *filp = file;
45
46 /* Set up the missing parts of the file_lock structure */
47 lock->fl.fl_file = file->f_file;
48 lock->fl.fl_owner = (fl_owner_t) host;
49 lock->fl.fl_lmops = &nlmsvc_lock_operations;
50 }
51
52 return 0;
53
54no_locks:
55 nlmsvc_release_host(host);
56 if (error)
57 return error;
58 return nlm_lck_denied_nolocks;
59}
60
61/*
62 * NULL: Test for presence of service
63 */
64static __be32
65nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
66{
67 dprintk("lockd: NULL called\n");
68 return rpc_success;
69}
70
71/*
72 * TEST: Check for conflicting lock
73 */
74static __be32
75nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
76 struct nlm_res *resp)
77{
78 struct nlm_host *host;
79 struct nlm_file *file;
80 __be32 rc = rpc_success;
81
82 dprintk("lockd: TEST4 called\n");
83 resp->cookie = argp->cookie;
84
85 /* Obtain client and file */
86 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
87 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
88
89 /* Now check for conflicting locks */
90 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
91 if (resp->status == nlm_drop_reply)
92 rc = rpc_drop_reply;
93 else
94 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
95
96 nlmsvc_release_host(host);
97 nlm_release_file(file);
98 return rc;
99}
100
101static __be32
102nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
103 struct nlm_res *resp)
104{
105 struct nlm_host *host;
106 struct nlm_file *file;
107 __be32 rc = rpc_success;
108
109 dprintk("lockd: LOCK called\n");
110
111 resp->cookie = argp->cookie;
112
113 /* Obtain client and file */
114 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
115 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
116
117#if 0
118 /* If supplied state doesn't match current state, we assume it's
119 * an old request that time-warped somehow. Any error return would
120 * do in this case because it's irrelevant anyway.
121 *
122 * NB: We don't retrieve the remote host's state yet.
123 */
124 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
125 resp->status = nlm_lck_denied_nolocks;
126 } else
127#endif
128
129 /* Now try to lock the file */
130 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
131 argp->block, &argp->cookie,
132 argp->reclaim);
133 if (resp->status == nlm_drop_reply)
134 rc = rpc_drop_reply;
135 else
136 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
137
138 nlmsvc_release_host(host);
139 nlm_release_file(file);
140 return rc;
141}
142
143static __be32
144nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
145 struct nlm_res *resp)
146{
147 struct nlm_host *host;
148 struct nlm_file *file;
149
150 dprintk("lockd: CANCEL called\n");
151
152 resp->cookie = argp->cookie;
153
154 /* Don't accept requests during grace period */
155 if (locks_in_grace(SVC_NET(rqstp))) {
156 resp->status = nlm_lck_denied_grace_period;
157 return rpc_success;
158 }
159
160 /* Obtain client and file */
161 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
162 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
163
164 /* Try to cancel request. */
165 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
166
167 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
168 nlmsvc_release_host(host);
169 nlm_release_file(file);
170 return rpc_success;
171}
172
173/*
174 * UNLOCK: release a lock
175 */
176static __be32
177nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
178 struct nlm_res *resp)
179{
180 struct nlm_host *host;
181 struct nlm_file *file;
182
183 dprintk("lockd: UNLOCK called\n");
184
185 resp->cookie = argp->cookie;
186
187 /* Don't accept new lock requests during grace period */
188 if (locks_in_grace(SVC_NET(rqstp))) {
189 resp->status = nlm_lck_denied_grace_period;
190 return rpc_success;
191 }
192
193 /* Obtain client and file */
194 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
195 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
196
197 /* Now try to remove the lock */
198 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
199
200 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
201 nlmsvc_release_host(host);
202 nlm_release_file(file);
203 return rpc_success;
204}
205
206/*
207 * GRANTED: A server calls us to tell that a process' lock request
208 * was granted
209 */
210static __be32
211nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
212 struct nlm_res *resp)
213{
214 resp->cookie = argp->cookie;
215
216 dprintk("lockd: GRANTED called\n");
217 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
218 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
219 return rpc_success;
220}
221
222/*
223 * This is the generic lockd callback for async RPC calls
224 */
225static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
226{
227 dprintk("lockd: %5u callback returned %d\n", task->tk_pid,
228 -task->tk_status);
229}
230
231static void nlm4svc_callback_release(void *data)
232{
233 nlmsvc_release_call(data);
234}
235
236static const struct rpc_call_ops nlm4svc_callback_ops = {
237 .rpc_call_done = nlm4svc_callback_exit,
238 .rpc_release = nlm4svc_callback_release,
239};
240
241/*
242 * `Async' versions of the above service routines. They aren't really,
243 * because we send the callback before the reply proper. I hope this
244 * doesn't break any clients.
245 */
246static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
247 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *))
248{
249 struct nlm_host *host;
250 struct nlm_rqst *call;
251 __be32 stat;
252
253 host = nlmsvc_lookup_host(rqstp,
254 argp->lock.caller,
255 argp->lock.len);
256 if (host == NULL)
257 return rpc_system_err;
258
259 call = nlm_alloc_call(host);
260 nlmsvc_release_host(host);
261 if (call == NULL)
262 return rpc_system_err;
263
264 stat = func(rqstp, argp, &call->a_res);
265 if (stat != 0) {
266 nlmsvc_release_call(call);
267 return stat;
268 }
269
270 call->a_flags = RPC_TASK_ASYNC;
271 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
272 return rpc_system_err;
273 return rpc_success;
274}
275
276static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
277 void *resp)
278{
279 dprintk("lockd: TEST_MSG called\n");
280 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
281}
282
283static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
284 void *resp)
285{
286 dprintk("lockd: LOCK_MSG called\n");
287 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
288}
289
290static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
291 void *resp)
292{
293 dprintk("lockd: CANCEL_MSG called\n");
294 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
295}
296
297static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
298 void *resp)
299{
300 dprintk("lockd: UNLOCK_MSG called\n");
301 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
302}
303
304static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
305 void *resp)
306{
307 dprintk("lockd: GRANTED_MSG called\n");
308 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
309}
310
311/*
312 * SHARE: create a DOS share or alter existing share.
313 */
314static __be32
315nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
316 struct nlm_res *resp)
317{
318 struct nlm_host *host;
319 struct nlm_file *file;
320
321 dprintk("lockd: SHARE called\n");
322
323 resp->cookie = argp->cookie;
324
325 /* Don't accept new lock requests during grace period */
326 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
327 resp->status = nlm_lck_denied_grace_period;
328 return rpc_success;
329 }
330
331 /* Obtain client and file */
332 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
333 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
334
335 /* Now try to create the share */
336 resp->status = nlmsvc_share_file(host, file, argp);
337
338 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
339 nlmsvc_release_host(host);
340 nlm_release_file(file);
341 return rpc_success;
342}
343
344/*
345 * UNSHARE: Release a DOS share.
346 */
347static __be32
348nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
349 struct nlm_res *resp)
350{
351 struct nlm_host *host;
352 struct nlm_file *file;
353
354 dprintk("lockd: UNSHARE called\n");
355
356 resp->cookie = argp->cookie;
357
358 /* Don't accept requests during grace period */
359 if (locks_in_grace(SVC_NET(rqstp))) {
360 resp->status = nlm_lck_denied_grace_period;
361 return rpc_success;
362 }
363
364 /* Obtain client and file */
365 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
366 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
367
368 /* Now try to lock the file */
369 resp->status = nlmsvc_unshare_file(host, file, argp);
370
371 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
372 nlmsvc_release_host(host);
373 nlm_release_file(file);
374 return rpc_success;
375}
376
377/*
378 * NM_LOCK: Create an unmonitored lock
379 */
380static __be32
381nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
382 struct nlm_res *resp)
383{
384 dprintk("lockd: NM_LOCK called\n");
385
386 argp->monitor = 0; /* just clean the monitor flag */
387 return nlm4svc_proc_lock(rqstp, argp, resp);
388}
389
390/*
391 * FREE_ALL: Release all locks and shares held by client
392 */
393static __be32
394nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
395 void *resp)
396{
397 struct nlm_host *host;
398
399 /* Obtain client */
400 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
401 return rpc_success;
402
403 nlmsvc_free_host_resources(host);
404 nlmsvc_release_host(host);
405 return rpc_success;
406}
407
408/*
409 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
410 */
411static __be32
412nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
413 void *resp)
414{
415 dprintk("lockd: SM_NOTIFY called\n");
416
417 if (!nlm_privileged_requester(rqstp)) {
418 char buf[RPC_MAX_ADDRBUFLEN];
419 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
420 svc_print_addr(rqstp, buf, sizeof(buf)));
421 return rpc_system_err;
422 }
423
424 nlm_host_rebooted(SVC_NET(rqstp), argp);
425 return rpc_success;
426}
427
428/*
429 * client sent a GRANTED_RES, let's remove the associated block
430 */
431static __be32
432nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp,
433 void *resp)
434{
435 if (!nlmsvc_ops)
436 return rpc_success;
437
438 dprintk("lockd: GRANTED_RES called\n");
439
440 nlmsvc_grant_reply(&argp->cookie, argp->status);
441 return rpc_success;
442}
443
444
445/*
446 * NLM Server procedures.
447 */
448
449#define nlm4svc_encode_norep nlm4svc_encode_void
450#define nlm4svc_decode_norep nlm4svc_decode_void
451#define nlm4svc_decode_testres nlm4svc_decode_void
452#define nlm4svc_decode_lockres nlm4svc_decode_void
453#define nlm4svc_decode_unlockres nlm4svc_decode_void
454#define nlm4svc_decode_cancelres nlm4svc_decode_void
455#define nlm4svc_decode_grantedres nlm4svc_decode_void
456
457#define nlm4svc_proc_none nlm4svc_proc_null
458#define nlm4svc_proc_test_res nlm4svc_proc_null
459#define nlm4svc_proc_lock_res nlm4svc_proc_null
460#define nlm4svc_proc_cancel_res nlm4svc_proc_null
461#define nlm4svc_proc_unlock_res nlm4svc_proc_null
462
463struct nlm_void { int dummy; };
464
465#define PROC(name, xargt, xrest, argt, rest, respsize) \
466 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \
467 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \
468 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \
469 .pc_release = NULL, \
470 .pc_argsize = sizeof(struct nlm_##argt), \
471 .pc_ressize = sizeof(struct nlm_##rest), \
472 .pc_xdrressize = respsize, \
473 }
474#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
475#define No (1+1024/4) /* netobj */
476#define St 1 /* status */
477#define Rg 4 /* range (offset + length) */
478struct svc_procedure nlmsvc_procedures4[] = {
479 PROC(null, void, void, void, void, 1),
480 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg),
481 PROC(lock, lockargs, res, args, res, Ck+St),
482 PROC(cancel, cancargs, res, args, res, Ck+St),
483 PROC(unlock, unlockargs, res, args, res, Ck+St),
484 PROC(granted, testargs, res, args, res, Ck+St),
485 PROC(test_msg, testargs, norep, args, void, 1),
486 PROC(lock_msg, lockargs, norep, args, void, 1),
487 PROC(cancel_msg, cancargs, norep, args, void, 1),
488 PROC(unlock_msg, unlockargs, norep, args, void, 1),
489 PROC(granted_msg, testargs, norep, args, void, 1),
490 PROC(test_res, testres, norep, res, void, 1),
491 PROC(lock_res, lockres, norep, res, void, 1),
492 PROC(cancel_res, cancelres, norep, res, void, 1),
493 PROC(unlock_res, unlockres, norep, res, void, 1),
494 PROC(granted_res, res, norep, res, void, 1),
495 /* statd callback */
496 PROC(sm_notify, reboot, void, reboot, void, 1),
497 PROC(none, void, void, void, void, 0),
498 PROC(none, void, void, void, void, 0),
499 PROC(none, void, void, void, void, 0),
500 PROC(share, shareargs, shareres, args, res, Ck+St+1),
501 PROC(unshare, shareargs, shareres, args, res, Ck+St+1),
502 PROC(nm_lock, lockargs, res, args, res, Ck+St),
503 PROC(free_all, notify, void, args, void, 1),
504
505};