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1 | /* |
2 | * linux/fs/lockd/svcproc.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/slab.h> |
13 | #include <linux/smp_lock.h> |
14 | #include <linux/in.h> |
15 | #include <linux/sunrpc/svc.h> |
16 | #include <linux/sunrpc/clnt.h> |
17 | #include <linux/nfsd/nfsd.h> |
18 | #include <linux/lockd/lockd.h> |
19 | #include <linux/lockd/share.h> |
20 | |
21 | #define NLMDBG_FACILITY NLMDBG_CLIENT |
22 | |
23 | #ifdef CONFIG_LOCKD_V4 |
24 | static __be32 |
25 | cast_to_nlm(__be32 status, u32 vers) |
26 | { |
27 | /* Note: status is assumed to be in network byte order !!! */ |
28 | if (vers != 4){ |
29 | switch (status) { |
30 | case nlm_granted: |
31 | case nlm_lck_denied: |
32 | case nlm_lck_denied_nolocks: |
33 | case nlm_lck_blocked: |
34 | case nlm_lck_denied_grace_period: |
35 | case nlm_drop_reply: |
36 | break; |
37 | case nlm4_deadlock: |
38 | status = nlm_lck_denied; |
39 | break; |
40 | default: |
41 | status = nlm_lck_denied_nolocks; |
42 | } |
43 | } |
44 | |
45 | return (status); |
46 | } |
47 | #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) |
48 | #else |
49 | #define cast_status(status) (status) |
50 | #endif |
51 | |
52 | /* |
53 | * Obtain client and file from arguments |
54 | */ |
55 | static __be32 |
56 | nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, |
57 | struct nlm_host **hostp, struct nlm_file **filp) |
58 | { |
59 | struct nlm_host *host = NULL; |
60 | struct nlm_file *file = NULL; |
61 | struct nlm_lock *lock = &argp->lock; |
62 | __be32 error = 0; |
63 | |
64 | /* nfsd callbacks must have been installed for this procedure */ |
65 | if (!nlmsvc_ops) |
66 | return nlm_lck_denied_nolocks; |
67 | |
68 | /* Obtain host handle */ |
69 | if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) |
70 | || (argp->monitor && nsm_monitor(host) < 0)) |
71 | goto no_locks; |
72 | *hostp = host; |
73 | |
74 | /* Obtain file pointer. Not used by FREE_ALL call. */ |
75 | if (filp != NULL) { |
76 | if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) |
77 | goto no_locks; |
78 | *filp = file; |
79 | |
80 | /* Set up the missing parts of the file_lock structure */ |
81 | lock->fl.fl_file = file->f_file; |
82 | lock->fl.fl_owner = (fl_owner_t) host; |
83 | lock->fl.fl_lmops = &nlmsvc_lock_operations; |
84 | } |
85 | |
86 | return 0; |
87 | |
88 | no_locks: |
89 | nlm_release_host(host); |
90 | if (error) |
91 | return error; |
92 | return nlm_lck_denied_nolocks; |
93 | } |
94 | |
95 | /* |
96 | * NULL: Test for presence of service |
97 | */ |
98 | static __be32 |
99 | nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) |
100 | { |
101 | dprintk("lockd: NULL called\n"); |
102 | return rpc_success; |
103 | } |
104 | |
105 | /* |
106 | * TEST: Check for conflicting lock |
107 | */ |
108 | static __be32 |
109 | nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, |
110 | struct nlm_res *resp) |
111 | { |
112 | struct nlm_host *host; |
113 | struct nlm_file *file; |
114 | __be32 rc = rpc_success; |
115 | |
116 | dprintk("lockd: TEST called\n"); |
117 | resp->cookie = argp->cookie; |
118 | |
119 | /* Obtain client and file */ |
120 | if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) |
121 | return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
122 | |
123 | /* Now check for conflicting locks */ |
124 | resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie)); |
125 | if (resp->status == nlm_drop_reply) |
126 | rc = rpc_drop_reply; |
127 | else |
128 | dprintk("lockd: TEST status %d vers %d\n", |
129 | ntohl(resp->status), rqstp->rq_vers); |
130 | |
131 | nlm_release_host(host); |
132 | nlm_release_file(file); |
133 | return rc; |
134 | } |
135 | |
136 | static __be32 |
137 | nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, |
138 | struct nlm_res *resp) |
139 | { |
140 | struct nlm_host *host; |
141 | struct nlm_file *file; |
142 | __be32 rc = rpc_success; |
143 | |
144 | dprintk("lockd: LOCK called\n"); |
145 | |
146 | resp->cookie = argp->cookie; |
147 | |
148 | /* Obtain client and file */ |
149 | if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) |
150 | return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
151 | |
152 | #if 0 |
153 | /* If supplied state doesn't match current state, we assume it's |
154 | * an old request that time-warped somehow. Any error return would |
155 | * do in this case because it's irrelevant anyway. |
156 | * |
157 | * NB: We don't retrieve the remote host's state yet. |
158 | */ |
159 | if (host->h_nsmstate && host->h_nsmstate != argp->state) { |
160 | resp->status = nlm_lck_denied_nolocks; |
161 | } else |
162 | #endif |
163 | |
164 | /* Now try to lock the file */ |
165 | resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, |
166 | argp->block, &argp->cookie, |
167 | argp->reclaim)); |
168 | if (resp->status == nlm_drop_reply) |
169 | rc = rpc_drop_reply; |
170 | else |
171 | dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); |
172 | |
173 | nlm_release_host(host); |
174 | nlm_release_file(file); |
175 | return rc; |
176 | } |
177 | |
178 | static __be32 |
179 | nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, |
180 | struct nlm_res *resp) |
181 | { |
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()) { |
191 | resp->status = nlm_lck_denied_grace_period; |
192 | return rpc_success; |
193 | } |
194 | |
195 | /* Obtain client and file */ |
196 | if ((resp->status = nlmsvc_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 = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); |
201 | |
202 | dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); |
203 | nlm_release_host(host); |
204 | nlm_release_file(file); |
205 | return rpc_success; |
206 | } |
207 | |
208 | /* |
209 | * UNLOCK: release a lock |
210 | */ |
211 | static __be32 |
212 | nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, |
213 | struct nlm_res *resp) |
214 | { |
215 | struct nlm_host *host; |
216 | struct nlm_file *file; |
217 | |
218 | dprintk("lockd: UNLOCK called\n"); |
219 | |
220 | resp->cookie = argp->cookie; |
221 | |
222 | /* Don't accept new lock requests during grace period */ |
223 | if (locks_in_grace()) { |
224 | resp->status = nlm_lck_denied_grace_period; |
225 | return rpc_success; |
226 | } |
227 | |
228 | /* Obtain client and file */ |
229 | if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) |
230 | return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
231 | |
232 | /* Now try to remove the lock */ |
233 | resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); |
234 | |
235 | dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); |
236 | nlm_release_host(host); |
237 | nlm_release_file(file); |
238 | return rpc_success; |
239 | } |
240 | |
241 | /* |
242 | * GRANTED: A server calls us to tell that a process' lock request |
243 | * was granted |
244 | */ |
245 | static __be32 |
246 | nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, |
247 | struct nlm_res *resp) |
248 | { |
249 | resp->cookie = argp->cookie; |
250 | |
251 | dprintk("lockd: GRANTED called\n"); |
252 | resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); |
253 | dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); |
254 | return rpc_success; |
255 | } |
256 | |
257 | /* |
258 | * This is the generic lockd callback for async RPC calls |
259 | */ |
260 | static void nlmsvc_callback_exit(struct rpc_task *task, void *data) |
261 | { |
262 | dprintk("lockd: %5u callback returned %d\n", task->tk_pid, |
263 | -task->tk_status); |
264 | } |
265 | |
266 | static void nlmsvc_callback_release(void *data) |
267 | { |
268 | lock_kernel(); |
269 | nlm_release_call(data); |
270 | unlock_kernel(); |
271 | } |
272 | |
273 | static const struct rpc_call_ops nlmsvc_callback_ops = { |
274 | .rpc_call_done = nlmsvc_callback_exit, |
275 | .rpc_release = nlmsvc_callback_release, |
276 | }; |
277 | |
278 | /* |
279 | * `Async' versions of the above service routines. They aren't really, |
280 | * because we send the callback before the reply proper. I hope this |
281 | * doesn't break any clients. |
282 | */ |
283 | static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, |
284 | __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) |
285 | { |
286 | struct nlm_host *host; |
287 | struct nlm_rqst *call; |
288 | __be32 stat; |
289 | |
290 | host = nlmsvc_lookup_host(rqstp, |
291 | argp->lock.caller, |
292 | argp->lock.len); |
293 | if (host == NULL) |
294 | return rpc_system_err; |
295 | |
296 | call = nlm_alloc_call(host); |
297 | if (call == NULL) |
298 | return rpc_system_err; |
299 | |
300 | stat = func(rqstp, argp, &call->a_res); |
301 | if (stat != 0) { |
302 | nlm_release_call(call); |
303 | return stat; |
304 | } |
305 | |
306 | call->a_flags = RPC_TASK_ASYNC; |
307 | if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) |
308 | return rpc_system_err; |
309 | return rpc_success; |
310 | } |
311 | |
312 | static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
313 | void *resp) |
314 | { |
315 | dprintk("lockd: TEST_MSG called\n"); |
316 | return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); |
317 | } |
318 | |
319 | static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
320 | void *resp) |
321 | { |
322 | dprintk("lockd: LOCK_MSG called\n"); |
323 | return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); |
324 | } |
325 | |
326 | static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
327 | void *resp) |
328 | { |
329 | dprintk("lockd: CANCEL_MSG called\n"); |
330 | return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); |
331 | } |
332 | |
333 | static __be32 |
334 | nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
335 | void *resp) |
336 | { |
337 | dprintk("lockd: UNLOCK_MSG called\n"); |
338 | return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); |
339 | } |
340 | |
341 | static __be32 |
342 | nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
343 | void *resp) |
344 | { |
345 | dprintk("lockd: GRANTED_MSG called\n"); |
346 | return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); |
347 | } |
348 | |
349 | /* |
350 | * SHARE: create a DOS share or alter existing share. |
351 | */ |
352 | static __be32 |
353 | nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, |
354 | struct nlm_res *resp) |
355 | { |
356 | struct nlm_host *host; |
357 | struct nlm_file *file; |
358 | |
359 | dprintk("lockd: SHARE called\n"); |
360 | |
361 | resp->cookie = argp->cookie; |
362 | |
363 | /* Don't accept new lock requests during grace period */ |
364 | if (locks_in_grace() && !argp->reclaim) { |
365 | resp->status = nlm_lck_denied_grace_period; |
366 | return rpc_success; |
367 | } |
368 | |
369 | /* Obtain client and file */ |
370 | if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) |
371 | return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
372 | |
373 | /* Now try to create the share */ |
374 | resp->status = cast_status(nlmsvc_share_file(host, file, argp)); |
375 | |
376 | dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); |
377 | nlm_release_host(host); |
378 | nlm_release_file(file); |
379 | return rpc_success; |
380 | } |
381 | |
382 | /* |
383 | * UNSHARE: Release a DOS share. |
384 | */ |
385 | static __be32 |
386 | nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, |
387 | struct nlm_res *resp) |
388 | { |
389 | struct nlm_host *host; |
390 | struct nlm_file *file; |
391 | |
392 | dprintk("lockd: UNSHARE called\n"); |
393 | |
394 | resp->cookie = argp->cookie; |
395 | |
396 | /* Don't accept requests during grace period */ |
397 | if (locks_in_grace()) { |
398 | resp->status = nlm_lck_denied_grace_period; |
399 | return rpc_success; |
400 | } |
401 | |
402 | /* Obtain client and file */ |
403 | if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) |
404 | return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; |
405 | |
406 | /* Now try to unshare the file */ |
407 | resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); |
408 | |
409 | dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); |
410 | nlm_release_host(host); |
411 | nlm_release_file(file); |
412 | return rpc_success; |
413 | } |
414 | |
415 | /* |
416 | * NM_LOCK: Create an unmonitored lock |
417 | */ |
418 | static __be32 |
419 | nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, |
420 | struct nlm_res *resp) |
421 | { |
422 | dprintk("lockd: NM_LOCK called\n"); |
423 | |
424 | argp->monitor = 0; /* just clean the monitor flag */ |
425 | return nlmsvc_proc_lock(rqstp, argp, resp); |
426 | } |
427 | |
428 | /* |
429 | * FREE_ALL: Release all locks and shares held by client |
430 | */ |
431 | static __be32 |
432 | nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, |
433 | void *resp) |
434 | { |
435 | struct nlm_host *host; |
436 | |
437 | /* Obtain client */ |
438 | if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) |
439 | return rpc_success; |
440 | |
441 | nlmsvc_free_host_resources(host); |
442 | nlm_release_host(host); |
443 | return rpc_success; |
444 | } |
445 | |
446 | /* |
447 | * SM_NOTIFY: private callback from statd (not part of official NLM proto) |
448 | */ |
449 | static __be32 |
450 | nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, |
451 | void *resp) |
452 | { |
453 | dprintk("lockd: SM_NOTIFY called\n"); |
454 | |
455 | if (!nlm_privileged_requester(rqstp)) { |
456 | char buf[RPC_MAX_ADDRBUFLEN]; |
457 | printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", |
458 | svc_print_addr(rqstp, buf, sizeof(buf))); |
459 | return rpc_system_err; |
460 | } |
461 | |
462 | nlm_host_rebooted(argp); |
463 | return rpc_success; |
464 | } |
465 | |
466 | /* |
467 | * client sent a GRANTED_RES, let's remove the associated block |
468 | */ |
469 | static __be32 |
470 | nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, |
471 | void *resp) |
472 | { |
473 | if (!nlmsvc_ops) |
474 | return rpc_success; |
475 | |
476 | dprintk("lockd: GRANTED_RES called\n"); |
477 | |
478 | nlmsvc_grant_reply(&argp->cookie, argp->status); |
479 | return rpc_success; |
480 | } |
481 | |
482 | /* |
483 | * NLM Server procedures. |
484 | */ |
485 | |
486 | #define nlmsvc_encode_norep nlmsvc_encode_void |
487 | #define nlmsvc_decode_norep nlmsvc_decode_void |
488 | #define nlmsvc_decode_testres nlmsvc_decode_void |
489 | #define nlmsvc_decode_lockres nlmsvc_decode_void |
490 | #define nlmsvc_decode_unlockres nlmsvc_decode_void |
491 | #define nlmsvc_decode_cancelres nlmsvc_decode_void |
492 | #define nlmsvc_decode_grantedres nlmsvc_decode_void |
493 | |
494 | #define nlmsvc_proc_none nlmsvc_proc_null |
495 | #define nlmsvc_proc_test_res nlmsvc_proc_null |
496 | #define nlmsvc_proc_lock_res nlmsvc_proc_null |
497 | #define nlmsvc_proc_cancel_res nlmsvc_proc_null |
498 | #define nlmsvc_proc_unlock_res nlmsvc_proc_null |
499 | |
500 | struct nlm_void { int dummy; }; |
501 | |
502 | #define PROC(name, xargt, xrest, argt, rest, respsize) \ |
503 | { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ |
504 | .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ |
505 | .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ |
506 | .pc_release = NULL, \ |
507 | .pc_argsize = sizeof(struct nlm_##argt), \ |
508 | .pc_ressize = sizeof(struct nlm_##rest), \ |
509 | .pc_xdrressize = respsize, \ |
510 | } |
511 | |
512 | #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ |
513 | #define St 1 /* status */ |
514 | #define No (1+1024/4) /* Net Obj */ |
515 | #define Rg 2 /* range - offset + size */ |
516 | |
517 | struct svc_procedure nlmsvc_procedures[] = { |
518 | PROC(null, void, void, void, void, 1), |
519 | PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), |
520 | PROC(lock, lockargs, res, args, res, Ck+St), |
521 | PROC(cancel, cancargs, res, args, res, Ck+St), |
522 | PROC(unlock, unlockargs, res, args, res, Ck+St), |
523 | PROC(granted, testargs, res, args, res, Ck+St), |
524 | PROC(test_msg, testargs, norep, args, void, 1), |
525 | PROC(lock_msg, lockargs, norep, args, void, 1), |
526 | PROC(cancel_msg, cancargs, norep, args, void, 1), |
527 | PROC(unlock_msg, unlockargs, norep, args, void, 1), |
528 | PROC(granted_msg, testargs, norep, args, void, 1), |
529 | PROC(test_res, testres, norep, res, void, 1), |
530 | PROC(lock_res, lockres, norep, res, void, 1), |
531 | PROC(cancel_res, cancelres, norep, res, void, 1), |
532 | PROC(unlock_res, unlockres, norep, res, void, 1), |
533 | PROC(granted_res, res, norep, res, void, 1), |
534 | /* statd callback */ |
535 | PROC(sm_notify, reboot, void, reboot, void, 1), |
536 | PROC(none, void, void, void, void, 1), |
537 | PROC(none, void, void, void, void, 1), |
538 | PROC(none, void, void, void, void, 1), |
539 | PROC(share, shareargs, shareres, args, res, Ck+St+1), |
540 | PROC(unshare, shareargs, shareres, args, res, Ck+St+1), |
541 | PROC(nm_lock, lockargs, res, args, res, Ck+St), |
542 | PROC(free_all, notify, void, args, void, 0), |
543 | |
544 | }; |
545 |
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