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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};
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 if (lock->lock_start > OFFSET_MAX ||
36 (lock->lock_len && ((lock->lock_len - 1) > (OFFSET_MAX - lock->lock_start))))
37 return nlm4_fbig;
38
39 /* Obtain host handle */
40 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len))
41 || (argp->monitor && nsm_monitor(host) < 0))
42 goto no_locks;
43 *hostp = host;
44
45 /* Obtain file pointer. Not used by FREE_ALL call. */
46 if (filp != NULL) {
47 int mode = lock_to_openmode(&lock->fl);
48
49 error = nlm_lookup_file(rqstp, &file, lock);
50 if (error)
51 goto no_locks;
52 *filp = file;
53
54 /* Set up the missing parts of the file_lock structure */
55 lock->fl.fl_flags = FL_POSIX;
56 lock->fl.fl_file = file->f_file[mode];
57 lock->fl.fl_pid = current->tgid;
58 lock->fl.fl_start = (loff_t)lock->lock_start;
59 lock->fl.fl_end = lock->lock_len ?
60 (loff_t)(lock->lock_start + lock->lock_len - 1) :
61 OFFSET_MAX;
62 lock->fl.fl_lmops = &nlmsvc_lock_operations;
63 nlmsvc_locks_init_private(&lock->fl, host, (pid_t)lock->svid);
64 if (!lock->fl.fl_owner) {
65 /* lockowner allocation has failed */
66 nlmsvc_release_host(host);
67 return nlm_lck_denied_nolocks;
68 }
69 }
70
71 return 0;
72
73no_locks:
74 nlmsvc_release_host(host);
75 if (error)
76 return error;
77 return nlm_lck_denied_nolocks;
78}
79
80/*
81 * NULL: Test for presence of service
82 */
83static __be32
84nlm4svc_proc_null(struct svc_rqst *rqstp)
85{
86 dprintk("lockd: NULL called\n");
87 return rpc_success;
88}
89
90/*
91 * TEST: Check for conflicting lock
92 */
93static __be32
94__nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp)
95{
96 struct nlm_args *argp = rqstp->rq_argp;
97 struct nlm_host *host;
98 struct nlm_file *file;
99 struct nlm_lockowner *test_owner;
100 __be32 rc = rpc_success;
101
102 dprintk("lockd: TEST4 called\n");
103 resp->cookie = argp->cookie;
104
105 /* Obtain client and file */
106 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
107 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
108
109 test_owner = argp->lock.fl.fl_owner;
110 /* Now check for conflicting locks */
111 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie);
112 if (resp->status == nlm_drop_reply)
113 rc = rpc_drop_reply;
114 else
115 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status));
116
117 nlmsvc_put_lockowner(test_owner);
118 nlmsvc_release_host(host);
119 nlm_release_file(file);
120 return rc;
121}
122
123static __be32
124nlm4svc_proc_test(struct svc_rqst *rqstp)
125{
126 return __nlm4svc_proc_test(rqstp, rqstp->rq_resp);
127}
128
129static __be32
130__nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp)
131{
132 struct nlm_args *argp = rqstp->rq_argp;
133 struct nlm_host *host;
134 struct nlm_file *file;
135 __be32 rc = rpc_success;
136
137 dprintk("lockd: LOCK called\n");
138
139 resp->cookie = argp->cookie;
140
141 /* Obtain client and file */
142 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
143 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
144
145#if 0
146 /* If supplied state doesn't match current state, we assume it's
147 * an old request that time-warped somehow. Any error return would
148 * do in this case because it's irrelevant anyway.
149 *
150 * NB: We don't retrieve the remote host's state yet.
151 */
152 if (host->h_nsmstate && host->h_nsmstate != argp->state) {
153 resp->status = nlm_lck_denied_nolocks;
154 } else
155#endif
156
157 /* Now try to lock the file */
158 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock,
159 argp->block, &argp->cookie,
160 argp->reclaim);
161 if (resp->status == nlm_drop_reply)
162 rc = rpc_drop_reply;
163 else
164 dprintk("lockd: LOCK status %d\n", ntohl(resp->status));
165
166 nlmsvc_release_lockowner(&argp->lock);
167 nlmsvc_release_host(host);
168 nlm_release_file(file);
169 return rc;
170}
171
172static __be32
173nlm4svc_proc_lock(struct svc_rqst *rqstp)
174{
175 return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp);
176}
177
178static __be32
179__nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp)
180{
181 struct nlm_args *argp = rqstp->rq_argp;
182 struct nlm_host *host;
183 struct nlm_file *file;
184
185 dprintk("lockd: CANCEL called\n");
186
187 resp->cookie = argp->cookie;
188
189 /* Don't accept requests during grace period */
190 if (locks_in_grace(SVC_NET(rqstp))) {
191 resp->status = nlm_lck_denied_grace_period;
192 return rpc_success;
193 }
194
195 /* Obtain client and file */
196 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
197 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
198
199 /* Try to cancel request. */
200 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock);
201
202 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status));
203 nlmsvc_release_lockowner(&argp->lock);
204 nlmsvc_release_host(host);
205 nlm_release_file(file);
206 return rpc_success;
207}
208
209static __be32
210nlm4svc_proc_cancel(struct svc_rqst *rqstp)
211{
212 return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp);
213}
214
215/*
216 * UNLOCK: release a lock
217 */
218static __be32
219__nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp)
220{
221 struct nlm_args *argp = rqstp->rq_argp;
222 struct nlm_host *host;
223 struct nlm_file *file;
224
225 dprintk("lockd: UNLOCK called\n");
226
227 resp->cookie = argp->cookie;
228
229 /* Don't accept new lock requests during grace period */
230 if (locks_in_grace(SVC_NET(rqstp))) {
231 resp->status = nlm_lck_denied_grace_period;
232 return rpc_success;
233 }
234
235 /* Obtain client and file */
236 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
237 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
238
239 /* Now try to remove the lock */
240 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock);
241
242 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status));
243 nlmsvc_release_lockowner(&argp->lock);
244 nlmsvc_release_host(host);
245 nlm_release_file(file);
246 return rpc_success;
247}
248
249static __be32
250nlm4svc_proc_unlock(struct svc_rqst *rqstp)
251{
252 return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp);
253}
254
255/*
256 * GRANTED: A server calls us to tell that a process' lock request
257 * was granted
258 */
259static __be32
260__nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp)
261{
262 struct nlm_args *argp = rqstp->rq_argp;
263
264 resp->cookie = argp->cookie;
265
266 dprintk("lockd: GRANTED called\n");
267 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock);
268 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status));
269 return rpc_success;
270}
271
272static __be32
273nlm4svc_proc_granted(struct svc_rqst *rqstp)
274{
275 return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp);
276}
277
278/*
279 * This is the generic lockd callback for async RPC calls
280 */
281static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
282{
283}
284
285static void nlm4svc_callback_release(void *data)
286{
287 nlmsvc_release_call(data);
288}
289
290static const struct rpc_call_ops nlm4svc_callback_ops = {
291 .rpc_call_done = nlm4svc_callback_exit,
292 .rpc_release = nlm4svc_callback_release,
293};
294
295/*
296 * `Async' versions of the above service routines. They aren't really,
297 * because we send the callback before the reply proper. I hope this
298 * doesn't break any clients.
299 */
300static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc,
301 __be32 (*func)(struct svc_rqst *, struct nlm_res *))
302{
303 struct nlm_args *argp = rqstp->rq_argp;
304 struct nlm_host *host;
305 struct nlm_rqst *call;
306 __be32 stat;
307
308 host = nlmsvc_lookup_host(rqstp,
309 argp->lock.caller,
310 argp->lock.len);
311 if (host == NULL)
312 return rpc_system_err;
313
314 call = nlm_alloc_call(host);
315 nlmsvc_release_host(host);
316 if (call == NULL)
317 return rpc_system_err;
318
319 stat = func(rqstp, &call->a_res);
320 if (stat != 0) {
321 nlmsvc_release_call(call);
322 return stat;
323 }
324
325 call->a_flags = RPC_TASK_ASYNC;
326 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
327 return rpc_system_err;
328 return rpc_success;
329}
330
331static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp)
332{
333 dprintk("lockd: TEST_MSG called\n");
334 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test);
335}
336
337static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp)
338{
339 dprintk("lockd: LOCK_MSG called\n");
340 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock);
341}
342
343static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp)
344{
345 dprintk("lockd: CANCEL_MSG called\n");
346 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel);
347}
348
349static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp)
350{
351 dprintk("lockd: UNLOCK_MSG called\n");
352 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock);
353}
354
355static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp)
356{
357 dprintk("lockd: GRANTED_MSG called\n");
358 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted);
359}
360
361/*
362 * SHARE: create a DOS share or alter existing share.
363 */
364static __be32
365nlm4svc_proc_share(struct svc_rqst *rqstp)
366{
367 struct nlm_args *argp = rqstp->rq_argp;
368 struct nlm_res *resp = rqstp->rq_resp;
369 struct nlm_host *host;
370 struct nlm_file *file;
371
372 dprintk("lockd: SHARE called\n");
373
374 resp->cookie = argp->cookie;
375
376 /* Don't accept new lock requests during grace period */
377 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) {
378 resp->status = nlm_lck_denied_grace_period;
379 return rpc_success;
380 }
381
382 /* Obtain client and file */
383 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
384 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
385
386 /* Now try to create the share */
387 resp->status = nlmsvc_share_file(host, file, argp);
388
389 dprintk("lockd: SHARE status %d\n", ntohl(resp->status));
390 nlmsvc_release_lockowner(&argp->lock);
391 nlmsvc_release_host(host);
392 nlm_release_file(file);
393 return rpc_success;
394}
395
396/*
397 * UNSHARE: Release a DOS share.
398 */
399static __be32
400nlm4svc_proc_unshare(struct svc_rqst *rqstp)
401{
402 struct nlm_args *argp = rqstp->rq_argp;
403 struct nlm_res *resp = rqstp->rq_resp;
404 struct nlm_host *host;
405 struct nlm_file *file;
406
407 dprintk("lockd: UNSHARE called\n");
408
409 resp->cookie = argp->cookie;
410
411 /* Don't accept requests during grace period */
412 if (locks_in_grace(SVC_NET(rqstp))) {
413 resp->status = nlm_lck_denied_grace_period;
414 return rpc_success;
415 }
416
417 /* Obtain client and file */
418 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
419 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success;
420
421 /* Now try to lock the file */
422 resp->status = nlmsvc_unshare_file(host, file, argp);
423
424 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status));
425 nlmsvc_release_lockowner(&argp->lock);
426 nlmsvc_release_host(host);
427 nlm_release_file(file);
428 return rpc_success;
429}
430
431/*
432 * NM_LOCK: Create an unmonitored lock
433 */
434static __be32
435nlm4svc_proc_nm_lock(struct svc_rqst *rqstp)
436{
437 struct nlm_args *argp = rqstp->rq_argp;
438
439 dprintk("lockd: NM_LOCK called\n");
440
441 argp->monitor = 0; /* just clean the monitor flag */
442 return nlm4svc_proc_lock(rqstp);
443}
444
445/*
446 * FREE_ALL: Release all locks and shares held by client
447 */
448static __be32
449nlm4svc_proc_free_all(struct svc_rqst *rqstp)
450{
451 struct nlm_args *argp = rqstp->rq_argp;
452 struct nlm_host *host;
453
454 /* Obtain client */
455 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
456 return rpc_success;
457
458 nlmsvc_free_host_resources(host);
459 nlmsvc_release_host(host);
460 return rpc_success;
461}
462
463/*
464 * SM_NOTIFY: private callback from statd (not part of official NLM proto)
465 */
466static __be32
467nlm4svc_proc_sm_notify(struct svc_rqst *rqstp)
468{
469 struct nlm_reboot *argp = rqstp->rq_argp;
470
471 dprintk("lockd: SM_NOTIFY called\n");
472
473 if (!nlm_privileged_requester(rqstp)) {
474 char buf[RPC_MAX_ADDRBUFLEN];
475 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n",
476 svc_print_addr(rqstp, buf, sizeof(buf)));
477 return rpc_system_err;
478 }
479
480 nlm_host_rebooted(SVC_NET(rqstp), argp);
481 return rpc_success;
482}
483
484/*
485 * client sent a GRANTED_RES, let's remove the associated block
486 */
487static __be32
488nlm4svc_proc_granted_res(struct svc_rqst *rqstp)
489{
490 struct nlm_res *argp = rqstp->rq_argp;
491
492 if (!nlmsvc_ops)
493 return rpc_success;
494
495 dprintk("lockd: GRANTED_RES called\n");
496
497 nlmsvc_grant_reply(&argp->cookie, argp->status);
498 return rpc_success;
499}
500
501static __be32
502nlm4svc_proc_unused(struct svc_rqst *rqstp)
503{
504 return rpc_proc_unavail;
505}
506
507
508/*
509 * NLM Server procedures.
510 */
511
512struct nlm_void { int dummy; };
513
514#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */
515#define No (1+1024/4) /* netobj */
516#define St 1 /* status */
517#define Rg 4 /* range (offset + length) */
518
519const struct svc_procedure nlmsvc_procedures4[24] = {
520 [NLMPROC_NULL] = {
521 .pc_func = nlm4svc_proc_null,
522 .pc_decode = nlm4svc_decode_void,
523 .pc_encode = nlm4svc_encode_void,
524 .pc_argsize = sizeof(struct nlm_void),
525 .pc_argzero = sizeof(struct nlm_void),
526 .pc_ressize = sizeof(struct nlm_void),
527 .pc_xdrressize = St,
528 .pc_name = "NULL",
529 },
530 [NLMPROC_TEST] = {
531 .pc_func = nlm4svc_proc_test,
532 .pc_decode = nlm4svc_decode_testargs,
533 .pc_encode = nlm4svc_encode_testres,
534 .pc_argsize = sizeof(struct nlm_args),
535 .pc_argzero = sizeof(struct nlm_args),
536 .pc_ressize = sizeof(struct nlm_res),
537 .pc_xdrressize = Ck+St+2+No+Rg,
538 .pc_name = "TEST",
539 },
540 [NLMPROC_LOCK] = {
541 .pc_func = nlm4svc_proc_lock,
542 .pc_decode = nlm4svc_decode_lockargs,
543 .pc_encode = nlm4svc_encode_res,
544 .pc_argsize = sizeof(struct nlm_args),
545 .pc_argzero = sizeof(struct nlm_args),
546 .pc_ressize = sizeof(struct nlm_res),
547 .pc_xdrressize = Ck+St,
548 .pc_name = "LOCK",
549 },
550 [NLMPROC_CANCEL] = {
551 .pc_func = nlm4svc_proc_cancel,
552 .pc_decode = nlm4svc_decode_cancargs,
553 .pc_encode = nlm4svc_encode_res,
554 .pc_argsize = sizeof(struct nlm_args),
555 .pc_argzero = sizeof(struct nlm_args),
556 .pc_ressize = sizeof(struct nlm_res),
557 .pc_xdrressize = Ck+St,
558 .pc_name = "CANCEL",
559 },
560 [NLMPROC_UNLOCK] = {
561 .pc_func = nlm4svc_proc_unlock,
562 .pc_decode = nlm4svc_decode_unlockargs,
563 .pc_encode = nlm4svc_encode_res,
564 .pc_argsize = sizeof(struct nlm_args),
565 .pc_argzero = sizeof(struct nlm_args),
566 .pc_ressize = sizeof(struct nlm_res),
567 .pc_xdrressize = Ck+St,
568 .pc_name = "UNLOCK",
569 },
570 [NLMPROC_GRANTED] = {
571 .pc_func = nlm4svc_proc_granted,
572 .pc_decode = nlm4svc_decode_testargs,
573 .pc_encode = nlm4svc_encode_res,
574 .pc_argsize = sizeof(struct nlm_args),
575 .pc_argzero = sizeof(struct nlm_args),
576 .pc_ressize = sizeof(struct nlm_res),
577 .pc_xdrressize = Ck+St,
578 .pc_name = "GRANTED",
579 },
580 [NLMPROC_TEST_MSG] = {
581 .pc_func = nlm4svc_proc_test_msg,
582 .pc_decode = nlm4svc_decode_testargs,
583 .pc_encode = nlm4svc_encode_void,
584 .pc_argsize = sizeof(struct nlm_args),
585 .pc_argzero = sizeof(struct nlm_args),
586 .pc_ressize = sizeof(struct nlm_void),
587 .pc_xdrressize = St,
588 .pc_name = "TEST_MSG",
589 },
590 [NLMPROC_LOCK_MSG] = {
591 .pc_func = nlm4svc_proc_lock_msg,
592 .pc_decode = nlm4svc_decode_lockargs,
593 .pc_encode = nlm4svc_encode_void,
594 .pc_argsize = sizeof(struct nlm_args),
595 .pc_argzero = sizeof(struct nlm_args),
596 .pc_ressize = sizeof(struct nlm_void),
597 .pc_xdrressize = St,
598 .pc_name = "LOCK_MSG",
599 },
600 [NLMPROC_CANCEL_MSG] = {
601 .pc_func = nlm4svc_proc_cancel_msg,
602 .pc_decode = nlm4svc_decode_cancargs,
603 .pc_encode = nlm4svc_encode_void,
604 .pc_argsize = sizeof(struct nlm_args),
605 .pc_argzero = sizeof(struct nlm_args),
606 .pc_ressize = sizeof(struct nlm_void),
607 .pc_xdrressize = St,
608 .pc_name = "CANCEL_MSG",
609 },
610 [NLMPROC_UNLOCK_MSG] = {
611 .pc_func = nlm4svc_proc_unlock_msg,
612 .pc_decode = nlm4svc_decode_unlockargs,
613 .pc_encode = nlm4svc_encode_void,
614 .pc_argsize = sizeof(struct nlm_args),
615 .pc_argzero = sizeof(struct nlm_args),
616 .pc_ressize = sizeof(struct nlm_void),
617 .pc_xdrressize = St,
618 .pc_name = "UNLOCK_MSG",
619 },
620 [NLMPROC_GRANTED_MSG] = {
621 .pc_func = nlm4svc_proc_granted_msg,
622 .pc_decode = nlm4svc_decode_testargs,
623 .pc_encode = nlm4svc_encode_void,
624 .pc_argsize = sizeof(struct nlm_args),
625 .pc_argzero = sizeof(struct nlm_args),
626 .pc_ressize = sizeof(struct nlm_void),
627 .pc_xdrressize = St,
628 .pc_name = "GRANTED_MSG",
629 },
630 [NLMPROC_TEST_RES] = {
631 .pc_func = nlm4svc_proc_null,
632 .pc_decode = nlm4svc_decode_void,
633 .pc_encode = nlm4svc_encode_void,
634 .pc_argsize = sizeof(struct nlm_res),
635 .pc_argzero = sizeof(struct nlm_res),
636 .pc_ressize = sizeof(struct nlm_void),
637 .pc_xdrressize = St,
638 .pc_name = "TEST_RES",
639 },
640 [NLMPROC_LOCK_RES] = {
641 .pc_func = nlm4svc_proc_null,
642 .pc_decode = nlm4svc_decode_void,
643 .pc_encode = nlm4svc_encode_void,
644 .pc_argsize = sizeof(struct nlm_res),
645 .pc_argzero = sizeof(struct nlm_res),
646 .pc_ressize = sizeof(struct nlm_void),
647 .pc_xdrressize = St,
648 .pc_name = "LOCK_RES",
649 },
650 [NLMPROC_CANCEL_RES] = {
651 .pc_func = nlm4svc_proc_null,
652 .pc_decode = nlm4svc_decode_void,
653 .pc_encode = nlm4svc_encode_void,
654 .pc_argsize = sizeof(struct nlm_res),
655 .pc_argzero = sizeof(struct nlm_res),
656 .pc_ressize = sizeof(struct nlm_void),
657 .pc_xdrressize = St,
658 .pc_name = "CANCEL_RES",
659 },
660 [NLMPROC_UNLOCK_RES] = {
661 .pc_func = nlm4svc_proc_null,
662 .pc_decode = nlm4svc_decode_void,
663 .pc_encode = nlm4svc_encode_void,
664 .pc_argsize = sizeof(struct nlm_res),
665 .pc_argzero = sizeof(struct nlm_res),
666 .pc_ressize = sizeof(struct nlm_void),
667 .pc_xdrressize = St,
668 .pc_name = "UNLOCK_RES",
669 },
670 [NLMPROC_GRANTED_RES] = {
671 .pc_func = nlm4svc_proc_granted_res,
672 .pc_decode = nlm4svc_decode_res,
673 .pc_encode = nlm4svc_encode_void,
674 .pc_argsize = sizeof(struct nlm_res),
675 .pc_argzero = sizeof(struct nlm_res),
676 .pc_ressize = sizeof(struct nlm_void),
677 .pc_xdrressize = St,
678 .pc_name = "GRANTED_RES",
679 },
680 [NLMPROC_NSM_NOTIFY] = {
681 .pc_func = nlm4svc_proc_sm_notify,
682 .pc_decode = nlm4svc_decode_reboot,
683 .pc_encode = nlm4svc_encode_void,
684 .pc_argsize = sizeof(struct nlm_reboot),
685 .pc_argzero = sizeof(struct nlm_reboot),
686 .pc_ressize = sizeof(struct nlm_void),
687 .pc_xdrressize = St,
688 .pc_name = "SM_NOTIFY",
689 },
690 [17] = {
691 .pc_func = nlm4svc_proc_unused,
692 .pc_decode = nlm4svc_decode_void,
693 .pc_encode = nlm4svc_encode_void,
694 .pc_argsize = sizeof(struct nlm_void),
695 .pc_argzero = sizeof(struct nlm_void),
696 .pc_ressize = sizeof(struct nlm_void),
697 .pc_xdrressize = 0,
698 .pc_name = "UNUSED",
699 },
700 [18] = {
701 .pc_func = nlm4svc_proc_unused,
702 .pc_decode = nlm4svc_decode_void,
703 .pc_encode = nlm4svc_encode_void,
704 .pc_argsize = sizeof(struct nlm_void),
705 .pc_argzero = sizeof(struct nlm_void),
706 .pc_ressize = sizeof(struct nlm_void),
707 .pc_xdrressize = 0,
708 .pc_name = "UNUSED",
709 },
710 [19] = {
711 .pc_func = nlm4svc_proc_unused,
712 .pc_decode = nlm4svc_decode_void,
713 .pc_encode = nlm4svc_encode_void,
714 .pc_argsize = sizeof(struct nlm_void),
715 .pc_argzero = sizeof(struct nlm_void),
716 .pc_ressize = sizeof(struct nlm_void),
717 .pc_xdrressize = 0,
718 .pc_name = "UNUSED",
719 },
720 [NLMPROC_SHARE] = {
721 .pc_func = nlm4svc_proc_share,
722 .pc_decode = nlm4svc_decode_shareargs,
723 .pc_encode = nlm4svc_encode_shareres,
724 .pc_argsize = sizeof(struct nlm_args),
725 .pc_argzero = sizeof(struct nlm_args),
726 .pc_ressize = sizeof(struct nlm_res),
727 .pc_xdrressize = Ck+St+1,
728 .pc_name = "SHARE",
729 },
730 [NLMPROC_UNSHARE] = {
731 .pc_func = nlm4svc_proc_unshare,
732 .pc_decode = nlm4svc_decode_shareargs,
733 .pc_encode = nlm4svc_encode_shareres,
734 .pc_argsize = sizeof(struct nlm_args),
735 .pc_argzero = sizeof(struct nlm_args),
736 .pc_ressize = sizeof(struct nlm_res),
737 .pc_xdrressize = Ck+St+1,
738 .pc_name = "UNSHARE",
739 },
740 [NLMPROC_NM_LOCK] = {
741 .pc_func = nlm4svc_proc_nm_lock,
742 .pc_decode = nlm4svc_decode_lockargs,
743 .pc_encode = nlm4svc_encode_res,
744 .pc_argsize = sizeof(struct nlm_args),
745 .pc_argzero = sizeof(struct nlm_args),
746 .pc_ressize = sizeof(struct nlm_res),
747 .pc_xdrressize = Ck+St,
748 .pc_name = "NM_LOCK",
749 },
750 [NLMPROC_FREE_ALL] = {
751 .pc_func = nlm4svc_proc_free_all,
752 .pc_decode = nlm4svc_decode_notify,
753 .pc_encode = nlm4svc_encode_void,
754 .pc_argsize = sizeof(struct nlm_args),
755 .pc_argzero = sizeof(struct nlm_args),
756 .pc_ressize = sizeof(struct nlm_void),
757 .pc_xdrressize = St,
758 .pc_name = "FREE_ALL",
759 },
760};