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Commit | Line | Data |
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1da177e4 LT |
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/slab.h> | |
13 | #include <linux/in.h> | |
14 | #include <linux/sunrpc/svc.h> | |
15 | #include <linux/sunrpc/clnt.h> | |
16 | #include <linux/nfsd/nfsd.h> | |
17 | #include <linux/lockd/lockd.h> | |
18 | #include <linux/lockd/share.h> | |
19 | #include <linux/lockd/sm_inter.h> | |
20 | ||
21 | ||
22 | #define NLMDBG_FACILITY NLMDBG_CLIENT | |
23 | ||
1da177e4 LT |
24 | /* |
25 | * Obtain client and file from arguments | |
26 | */ | |
27 | static u32 | |
28 | nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, | |
29 | struct nlm_host **hostp, struct nlm_file **filp) | |
30 | { | |
31 | struct nlm_host *host = NULL; | |
32 | struct nlm_file *file = NULL; | |
33 | struct nlm_lock *lock = &argp->lock; | |
34 | u32 error = 0; | |
35 | ||
36 | /* nfsd callbacks must have been installed for this procedure */ | |
37 | if (!nlmsvc_ops) | |
38 | return nlm_lck_denied_nolocks; | |
39 | ||
40 | /* Obtain host handle */ | |
41 | if (!(host = nlmsvc_lookup_host(rqstp)) | |
42 | || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0)) | |
43 | goto no_locks; | |
44 | *hostp = host; | |
45 | ||
46 | /* Obtain file pointer. Not used by FREE_ALL call. */ | |
47 | if (filp != NULL) { | |
48 | if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) | |
49 | goto no_locks; | |
50 | *filp = file; | |
51 | ||
52 | /* Set up the missing parts of the file_lock structure */ | |
53 | lock->fl.fl_file = file->f_file; | |
54 | lock->fl.fl_owner = (fl_owner_t) host; | |
55 | lock->fl.fl_lmops = &nlmsvc_lock_operations; | |
56 | } | |
57 | ||
58 | return 0; | |
59 | ||
60 | no_locks: | |
61 | if (host) | |
62 | nlm_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 | */ | |
71 | static int | |
72 | nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) | |
73 | { | |
74 | dprintk("lockd: NULL called\n"); | |
75 | return rpc_success; | |
76 | } | |
77 | ||
78 | /* | |
79 | * TEST: Check for conflicting lock | |
80 | */ | |
81 | static int | |
82 | nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, | |
83 | struct nlm_res *resp) | |
84 | { | |
85 | struct nlm_host *host; | |
86 | struct nlm_file *file; | |
87 | ||
88 | dprintk("lockd: TEST4 called\n"); | |
89 | resp->cookie = argp->cookie; | |
90 | ||
91 | /* Don't accept test requests during grace period */ | |
92 | if (nlmsvc_grace_period) { | |
93 | resp->status = nlm_lck_denied_grace_period; | |
94 | return rpc_success; | |
95 | } | |
96 | ||
97 | /* Obtain client and file */ | |
98 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
99 | return rpc_success; | |
100 | ||
101 | /* Now check for conflicting locks */ | |
102 | resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock); | |
103 | ||
104 | dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); | |
105 | nlm_release_host(host); | |
106 | nlm_release_file(file); | |
107 | return rpc_success; | |
108 | } | |
109 | ||
110 | static int | |
111 | nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, | |
112 | struct nlm_res *resp) | |
113 | { | |
114 | struct nlm_host *host; | |
115 | struct nlm_file *file; | |
116 | ||
117 | dprintk("lockd: LOCK called\n"); | |
118 | ||
119 | resp->cookie = argp->cookie; | |
120 | ||
121 | /* Don't accept new lock requests during grace period */ | |
122 | if (nlmsvc_grace_period && !argp->reclaim) { | |
123 | resp->status = nlm_lck_denied_grace_period; | |
124 | return rpc_success; | |
125 | } | |
126 | ||
127 | /* Obtain client and file */ | |
128 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
129 | return 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, &argp->lock, | |
145 | argp->block, &argp->cookie); | |
146 | ||
147 | dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); | |
148 | nlm_release_host(host); | |
149 | nlm_release_file(file); | |
150 | return rpc_success; | |
151 | } | |
152 | ||
153 | static int | |
154 | nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, | |
155 | struct nlm_res *resp) | |
156 | { | |
157 | struct nlm_host *host; | |
158 | struct nlm_file *file; | |
159 | ||
160 | dprintk("lockd: CANCEL called\n"); | |
161 | ||
162 | resp->cookie = argp->cookie; | |
163 | ||
164 | /* Don't accept requests during grace period */ | |
165 | if (nlmsvc_grace_period) { | |
166 | resp->status = nlm_lck_denied_grace_period; | |
167 | return rpc_success; | |
168 | } | |
169 | ||
170 | /* Obtain client and file */ | |
171 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
172 | return rpc_success; | |
173 | ||
174 | /* Try to cancel request. */ | |
175 | resp->status = nlmsvc_cancel_blocked(file, &argp->lock); | |
176 | ||
177 | dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); | |
178 | nlm_release_host(host); | |
179 | nlm_release_file(file); | |
180 | return rpc_success; | |
181 | } | |
182 | ||
183 | /* | |
184 | * UNLOCK: release a lock | |
185 | */ | |
186 | static int | |
187 | nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, | |
188 | struct nlm_res *resp) | |
189 | { | |
190 | struct nlm_host *host; | |
191 | struct nlm_file *file; | |
192 | ||
193 | dprintk("lockd: UNLOCK called\n"); | |
194 | ||
195 | resp->cookie = argp->cookie; | |
196 | ||
197 | /* Don't accept new lock requests during grace period */ | |
198 | if (nlmsvc_grace_period) { | |
199 | resp->status = nlm_lck_denied_grace_period; | |
200 | return rpc_success; | |
201 | } | |
202 | ||
203 | /* Obtain client and file */ | |
204 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
205 | return rpc_success; | |
206 | ||
207 | /* Now try to remove the lock */ | |
208 | resp->status = nlmsvc_unlock(file, &argp->lock); | |
209 | ||
210 | dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); | |
211 | nlm_release_host(host); | |
212 | nlm_release_file(file); | |
213 | return rpc_success; | |
214 | } | |
215 | ||
216 | /* | |
217 | * GRANTED: A server calls us to tell that a process' lock request | |
218 | * was granted | |
219 | */ | |
220 | static int | |
221 | nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, | |
222 | struct nlm_res *resp) | |
223 | { | |
224 | resp->cookie = argp->cookie; | |
225 | ||
226 | dprintk("lockd: GRANTED called\n"); | |
5ac5f9d1 | 227 | resp->status = nlmclnt_grant(&rqstp->rq_addr, &argp->lock); |
1da177e4 LT |
228 | dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); |
229 | return rpc_success; | |
230 | } | |
231 | ||
d4716624 TM |
232 | /* |
233 | * This is the generic lockd callback for async RPC calls | |
234 | */ | |
235 | static void nlm4svc_callback_exit(struct rpc_task *task, void *data) | |
236 | { | |
237 | dprintk("lockd: %4d callback returned %d\n", task->tk_pid, | |
238 | -task->tk_status); | |
239 | } | |
240 | ||
241 | static void nlm4svc_callback_release(void *data) | |
242 | { | |
243 | nlm_release_call(data); | |
244 | } | |
245 | ||
246 | static const struct rpc_call_ops nlm4svc_callback_ops = { | |
247 | .rpc_call_done = nlm4svc_callback_exit, | |
248 | .rpc_release = nlm4svc_callback_release, | |
249 | }; | |
250 | ||
1da177e4 LT |
251 | /* |
252 | * `Async' versions of the above service routines. They aren't really, | |
253 | * because we send the callback before the reply proper. I hope this | |
254 | * doesn't break any clients. | |
255 | */ | |
d4716624 TM |
256 | static int nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, |
257 | int (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) | |
1da177e4 | 258 | { |
d4716624 TM |
259 | struct nlm_host *host; |
260 | struct nlm_rqst *call; | |
261 | int stat; | |
1da177e4 | 262 | |
d4716624 TM |
263 | host = nlmsvc_lookup_host(rqstp); |
264 | if (host == NULL) | |
265 | return rpc_system_err; | |
266 | ||
267 | call = nlm_alloc_call(host); | |
268 | if (call == NULL) | |
269 | return rpc_system_err; | |
270 | ||
271 | stat = func(rqstp, argp, &call->a_res); | |
272 | if (stat != 0) { | |
273 | nlm_release_call(call); | |
274 | return stat; | |
275 | } | |
1da177e4 | 276 | |
d4716624 TM |
277 | call->a_flags = RPC_TASK_ASYNC; |
278 | if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) | |
279 | return rpc_system_err; | |
280 | return rpc_success; | |
1da177e4 LT |
281 | } |
282 | ||
d4716624 | 283 | static int nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
284 | void *resp) |
285 | { | |
d4716624 TM |
286 | dprintk("lockd: TEST_MSG called\n"); |
287 | return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); | |
288 | } | |
1da177e4 | 289 | |
d4716624 TM |
290 | static int nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
291 | void *resp) | |
292 | { | |
1da177e4 | 293 | dprintk("lockd: LOCK_MSG called\n"); |
d4716624 | 294 | return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); |
1da177e4 LT |
295 | } |
296 | ||
d4716624 | 297 | static int nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
298 | void *resp) |
299 | { | |
1da177e4 | 300 | dprintk("lockd: CANCEL_MSG called\n"); |
d4716624 | 301 | return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); |
1da177e4 LT |
302 | } |
303 | ||
d4716624 | 304 | static int nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
305 | void *resp) |
306 | { | |
1da177e4 | 307 | dprintk("lockd: UNLOCK_MSG called\n"); |
d4716624 | 308 | return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); |
1da177e4 LT |
309 | } |
310 | ||
d4716624 | 311 | static int nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
312 | void *resp) |
313 | { | |
1da177e4 | 314 | dprintk("lockd: GRANTED_MSG called\n"); |
d4716624 | 315 | return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); |
1da177e4 LT |
316 | } |
317 | ||
318 | /* | |
319 | * SHARE: create a DOS share or alter existing share. | |
320 | */ | |
321 | static int | |
322 | nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, | |
323 | struct nlm_res *resp) | |
324 | { | |
325 | struct nlm_host *host; | |
326 | struct nlm_file *file; | |
327 | ||
328 | dprintk("lockd: SHARE called\n"); | |
329 | ||
330 | resp->cookie = argp->cookie; | |
331 | ||
332 | /* Don't accept new lock requests during grace period */ | |
333 | if (nlmsvc_grace_period && !argp->reclaim) { | |
334 | resp->status = nlm_lck_denied_grace_period; | |
335 | return rpc_success; | |
336 | } | |
337 | ||
338 | /* Obtain client and file */ | |
339 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
340 | return rpc_success; | |
341 | ||
342 | /* Now try to create the share */ | |
343 | resp->status = nlmsvc_share_file(host, file, argp); | |
344 | ||
345 | dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); | |
346 | nlm_release_host(host); | |
347 | nlm_release_file(file); | |
348 | return rpc_success; | |
349 | } | |
350 | ||
351 | /* | |
352 | * UNSHARE: Release a DOS share. | |
353 | */ | |
354 | static int | |
355 | nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, | |
356 | struct nlm_res *resp) | |
357 | { | |
358 | struct nlm_host *host; | |
359 | struct nlm_file *file; | |
360 | ||
361 | dprintk("lockd: UNSHARE called\n"); | |
362 | ||
363 | resp->cookie = argp->cookie; | |
364 | ||
365 | /* Don't accept requests during grace period */ | |
366 | if (nlmsvc_grace_period) { | |
367 | resp->status = nlm_lck_denied_grace_period; | |
368 | return rpc_success; | |
369 | } | |
370 | ||
371 | /* Obtain client and file */ | |
372 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
373 | return rpc_success; | |
374 | ||
375 | /* Now try to lock the file */ | |
376 | resp->status = nlmsvc_unshare_file(host, file, argp); | |
377 | ||
378 | dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); | |
379 | nlm_release_host(host); | |
380 | nlm_release_file(file); | |
381 | return rpc_success; | |
382 | } | |
383 | ||
384 | /* | |
385 | * NM_LOCK: Create an unmonitored lock | |
386 | */ | |
387 | static int | |
388 | nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, | |
389 | struct nlm_res *resp) | |
390 | { | |
391 | dprintk("lockd: NM_LOCK called\n"); | |
392 | ||
393 | argp->monitor = 0; /* just clean the monitor flag */ | |
394 | return nlm4svc_proc_lock(rqstp, argp, resp); | |
395 | } | |
396 | ||
397 | /* | |
398 | * FREE_ALL: Release all locks and shares held by client | |
399 | */ | |
400 | static int | |
401 | nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, | |
402 | void *resp) | |
403 | { | |
404 | struct nlm_host *host; | |
405 | ||
406 | /* Obtain client */ | |
407 | if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) | |
408 | return rpc_success; | |
409 | ||
410 | nlmsvc_free_host_resources(host); | |
411 | nlm_release_host(host); | |
412 | return rpc_success; | |
413 | } | |
414 | ||
415 | /* | |
416 | * SM_NOTIFY: private callback from statd (not part of official NLM proto) | |
417 | */ | |
418 | static int | |
419 | nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, | |
420 | void *resp) | |
421 | { | |
422 | struct sockaddr_in saddr = rqstp->rq_addr; | |
423 | int vers = argp->vers; | |
424 | int prot = argp->proto >> 1; | |
425 | ||
426 | struct nlm_host *host; | |
427 | ||
428 | dprintk("lockd: SM_NOTIFY called\n"); | |
429 | if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) | |
430 | || ntohs(saddr.sin_port) >= 1024) { | |
431 | printk(KERN_WARNING | |
432 | "lockd: rejected NSM callback from %08x:%d\n", | |
433 | ntohl(rqstp->rq_addr.sin_addr.s_addr), | |
434 | ntohs(rqstp->rq_addr.sin_port)); | |
435 | return rpc_system_err; | |
436 | } | |
437 | ||
438 | /* Obtain the host pointer for this NFS server and try to | |
439 | * reclaim all locks we hold on this server. | |
440 | */ | |
441 | saddr.sin_addr.s_addr = argp->addr; | |
442 | ||
443 | if ((argp->proto & 1)==0) { | |
444 | if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) { | |
445 | nlmclnt_recovery(host, argp->state); | |
446 | nlm_release_host(host); | |
447 | } | |
448 | } else { | |
449 | /* If we run on an NFS server, delete all locks held by the client */ | |
450 | ||
451 | if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) { | |
452 | nlmsvc_free_host_resources(host); | |
453 | nlm_release_host(host); | |
454 | } | |
455 | } | |
456 | return rpc_success; | |
457 | } | |
458 | ||
459 | /* | |
460 | * client sent a GRANTED_RES, let's remove the associated block | |
461 | */ | |
462 | static int | |
463 | nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, | |
464 | void *resp) | |
465 | { | |
466 | if (!nlmsvc_ops) | |
467 | return rpc_success; | |
468 | ||
469 | dprintk("lockd: GRANTED_RES called\n"); | |
470 | ||
471 | nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); | |
472 | return rpc_success; | |
473 | } | |
474 | ||
475 | ||
1da177e4 LT |
476 | /* |
477 | * NLM Server procedures. | |
478 | */ | |
479 | ||
480 | #define nlm4svc_encode_norep nlm4svc_encode_void | |
481 | #define nlm4svc_decode_norep nlm4svc_decode_void | |
482 | #define nlm4svc_decode_testres nlm4svc_decode_void | |
483 | #define nlm4svc_decode_lockres nlm4svc_decode_void | |
484 | #define nlm4svc_decode_unlockres nlm4svc_decode_void | |
485 | #define nlm4svc_decode_cancelres nlm4svc_decode_void | |
486 | #define nlm4svc_decode_grantedres nlm4svc_decode_void | |
487 | ||
488 | #define nlm4svc_proc_none nlm4svc_proc_null | |
489 | #define nlm4svc_proc_test_res nlm4svc_proc_null | |
490 | #define nlm4svc_proc_lock_res nlm4svc_proc_null | |
491 | #define nlm4svc_proc_cancel_res nlm4svc_proc_null | |
492 | #define nlm4svc_proc_unlock_res nlm4svc_proc_null | |
493 | ||
494 | struct nlm_void { int dummy; }; | |
495 | ||
496 | #define PROC(name, xargt, xrest, argt, rest, respsize) \ | |
497 | { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ | |
498 | .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ | |
499 | .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ | |
500 | .pc_release = NULL, \ | |
501 | .pc_argsize = sizeof(struct nlm_##argt), \ | |
502 | .pc_ressize = sizeof(struct nlm_##rest), \ | |
503 | .pc_xdrressize = respsize, \ | |
504 | } | |
505 | #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ | |
506 | #define No (1+1024/4) /* netobj */ | |
507 | #define St 1 /* status */ | |
508 | #define Rg 4 /* range (offset + length) */ | |
509 | struct svc_procedure nlmsvc_procedures4[] = { | |
510 | PROC(null, void, void, void, void, 1), | |
511 | PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), | |
512 | PROC(lock, lockargs, res, args, res, Ck+St), | |
513 | PROC(cancel, cancargs, res, args, res, Ck+St), | |
514 | PROC(unlock, unlockargs, res, args, res, Ck+St), | |
515 | PROC(granted, testargs, res, args, res, Ck+St), | |
516 | PROC(test_msg, testargs, norep, args, void, 1), | |
517 | PROC(lock_msg, lockargs, norep, args, void, 1), | |
518 | PROC(cancel_msg, cancargs, norep, args, void, 1), | |
519 | PROC(unlock_msg, unlockargs, norep, args, void, 1), | |
520 | PROC(granted_msg, testargs, norep, args, void, 1), | |
521 | PROC(test_res, testres, norep, res, void, 1), | |
522 | PROC(lock_res, lockres, norep, res, void, 1), | |
523 | PROC(cancel_res, cancelres, norep, res, void, 1), | |
524 | PROC(unlock_res, unlockres, norep, res, void, 1), | |
525 | PROC(granted_res, res, norep, res, void, 1), | |
526 | /* statd callback */ | |
527 | PROC(sm_notify, reboot, void, reboot, void, 1), | |
528 | PROC(none, void, void, void, void, 0), | |
529 | PROC(none, void, void, void, void, 0), | |
530 | PROC(none, void, void, void, void, 0), | |
531 | PROC(share, shareargs, shareres, args, res, Ck+St+1), | |
532 | PROC(unshare, shareargs, shareres, args, res, Ck+St+1), | |
533 | PROC(nm_lock, lockargs, res, args, res, Ck+St), | |
534 | PROC(free_all, notify, void, args, void, 1), | |
535 | ||
536 | }; |