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 */ | |
db4e4c9a | 41 | if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) |
977faf39 | 42 | || (argp->monitor && nsm_monitor(host) < 0)) |
1da177e4 LT |
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 | |
db4e4c9a OK |
263 | host = nlmsvc_lookup_host(rqstp, |
264 | argp->lock.caller, | |
265 | argp->lock.len); | |
d4716624 TM |
266 | if (host == NULL) |
267 | return rpc_system_err; | |
268 | ||
269 | call = nlm_alloc_call(host); | |
270 | if (call == NULL) | |
271 | return rpc_system_err; | |
272 | ||
273 | stat = func(rqstp, argp, &call->a_res); | |
274 | if (stat != 0) { | |
275 | nlm_release_call(call); | |
276 | return stat; | |
277 | } | |
1da177e4 | 278 | |
d4716624 TM |
279 | call->a_flags = RPC_TASK_ASYNC; |
280 | if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) | |
281 | return rpc_system_err; | |
282 | return rpc_success; | |
1da177e4 LT |
283 | } |
284 | ||
d4716624 | 285 | static int nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
286 | void *resp) |
287 | { | |
d4716624 TM |
288 | dprintk("lockd: TEST_MSG called\n"); |
289 | return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); | |
290 | } | |
1da177e4 | 291 | |
d4716624 TM |
292 | static int nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
293 | void *resp) | |
294 | { | |
1da177e4 | 295 | dprintk("lockd: LOCK_MSG called\n"); |
d4716624 | 296 | return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); |
1da177e4 LT |
297 | } |
298 | ||
d4716624 | 299 | static int nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
300 | void *resp) |
301 | { | |
1da177e4 | 302 | dprintk("lockd: CANCEL_MSG called\n"); |
d4716624 | 303 | return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); |
1da177e4 LT |
304 | } |
305 | ||
d4716624 | 306 | static int nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
307 | void *resp) |
308 | { | |
1da177e4 | 309 | dprintk("lockd: UNLOCK_MSG called\n"); |
d4716624 | 310 | return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); |
1da177e4 LT |
311 | } |
312 | ||
d4716624 | 313 | static int nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, |
1da177e4 LT |
314 | void *resp) |
315 | { | |
1da177e4 | 316 | dprintk("lockd: GRANTED_MSG called\n"); |
d4716624 | 317 | return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); |
1da177e4 LT |
318 | } |
319 | ||
320 | /* | |
321 | * SHARE: create a DOS share or alter existing share. | |
322 | */ | |
323 | static int | |
324 | nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, | |
325 | struct nlm_res *resp) | |
326 | { | |
327 | struct nlm_host *host; | |
328 | struct nlm_file *file; | |
329 | ||
330 | dprintk("lockd: SHARE called\n"); | |
331 | ||
332 | resp->cookie = argp->cookie; | |
333 | ||
334 | /* Don't accept new lock requests during grace period */ | |
335 | if (nlmsvc_grace_period && !argp->reclaim) { | |
336 | resp->status = nlm_lck_denied_grace_period; | |
337 | return rpc_success; | |
338 | } | |
339 | ||
340 | /* Obtain client and file */ | |
341 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
342 | return rpc_success; | |
343 | ||
344 | /* Now try to create the share */ | |
345 | resp->status = nlmsvc_share_file(host, file, argp); | |
346 | ||
347 | dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); | |
348 | nlm_release_host(host); | |
349 | nlm_release_file(file); | |
350 | return rpc_success; | |
351 | } | |
352 | ||
353 | /* | |
354 | * UNSHARE: Release a DOS share. | |
355 | */ | |
356 | static int | |
357 | nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, | |
358 | struct nlm_res *resp) | |
359 | { | |
360 | struct nlm_host *host; | |
361 | struct nlm_file *file; | |
362 | ||
363 | dprintk("lockd: UNSHARE called\n"); | |
364 | ||
365 | resp->cookie = argp->cookie; | |
366 | ||
367 | /* Don't accept requests during grace period */ | |
368 | if (nlmsvc_grace_period) { | |
369 | resp->status = nlm_lck_denied_grace_period; | |
370 | return rpc_success; | |
371 | } | |
372 | ||
373 | /* Obtain client and file */ | |
374 | if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) | |
375 | return rpc_success; | |
376 | ||
377 | /* Now try to lock the file */ | |
378 | resp->status = nlmsvc_unshare_file(host, file, argp); | |
379 | ||
380 | dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); | |
381 | nlm_release_host(host); | |
382 | nlm_release_file(file); | |
383 | return rpc_success; | |
384 | } | |
385 | ||
386 | /* | |
387 | * NM_LOCK: Create an unmonitored lock | |
388 | */ | |
389 | static int | |
390 | nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, | |
391 | struct nlm_res *resp) | |
392 | { | |
393 | dprintk("lockd: NM_LOCK called\n"); | |
394 | ||
395 | argp->monitor = 0; /* just clean the monitor flag */ | |
396 | return nlm4svc_proc_lock(rqstp, argp, resp); | |
397 | } | |
398 | ||
399 | /* | |
400 | * FREE_ALL: Release all locks and shares held by client | |
401 | */ | |
402 | static int | |
403 | nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, | |
404 | void *resp) | |
405 | { | |
406 | struct nlm_host *host; | |
407 | ||
408 | /* Obtain client */ | |
409 | if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) | |
410 | return rpc_success; | |
411 | ||
412 | nlmsvc_free_host_resources(host); | |
413 | nlm_release_host(host); | |
414 | return rpc_success; | |
415 | } | |
416 | ||
417 | /* | |
418 | * SM_NOTIFY: private callback from statd (not part of official NLM proto) | |
419 | */ | |
420 | static int | |
421 | nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, | |
422 | void *resp) | |
423 | { | |
424 | struct sockaddr_in saddr = rqstp->rq_addr; | |
1da177e4 LT |
425 | |
426 | dprintk("lockd: SM_NOTIFY called\n"); | |
427 | if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) | |
428 | || ntohs(saddr.sin_port) >= 1024) { | |
429 | printk(KERN_WARNING | |
430 | "lockd: rejected NSM callback from %08x:%d\n", | |
431 | ntohl(rqstp->rq_addr.sin_addr.s_addr), | |
432 | ntohs(rqstp->rq_addr.sin_port)); | |
433 | return rpc_system_err; | |
434 | } | |
435 | ||
436 | /* Obtain the host pointer for this NFS server and try to | |
437 | * reclaim all locks we hold on this server. | |
438 | */ | |
cf712c24 | 439 | memset(&saddr, 0, sizeof(saddr)); |
1da177e4 | 440 | saddr.sin_addr.s_addr = argp->addr; |
5c8dd29c | 441 | nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); |
1da177e4 | 442 | |
1da177e4 LT |
443 | return rpc_success; |
444 | } | |
445 | ||
446 | /* | |
447 | * client sent a GRANTED_RES, let's remove the associated block | |
448 | */ | |
449 | static int | |
450 | nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, | |
451 | void *resp) | |
452 | { | |
453 | if (!nlmsvc_ops) | |
454 | return rpc_success; | |
455 | ||
456 | dprintk("lockd: GRANTED_RES called\n"); | |
457 | ||
458 | nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); | |
459 | return rpc_success; | |
460 | } | |
461 | ||
462 | ||
1da177e4 LT |
463 | /* |
464 | * NLM Server procedures. | |
465 | */ | |
466 | ||
467 | #define nlm4svc_encode_norep nlm4svc_encode_void | |
468 | #define nlm4svc_decode_norep nlm4svc_decode_void | |
469 | #define nlm4svc_decode_testres nlm4svc_decode_void | |
470 | #define nlm4svc_decode_lockres nlm4svc_decode_void | |
471 | #define nlm4svc_decode_unlockres nlm4svc_decode_void | |
472 | #define nlm4svc_decode_cancelres nlm4svc_decode_void | |
473 | #define nlm4svc_decode_grantedres nlm4svc_decode_void | |
474 | ||
475 | #define nlm4svc_proc_none nlm4svc_proc_null | |
476 | #define nlm4svc_proc_test_res nlm4svc_proc_null | |
477 | #define nlm4svc_proc_lock_res nlm4svc_proc_null | |
478 | #define nlm4svc_proc_cancel_res nlm4svc_proc_null | |
479 | #define nlm4svc_proc_unlock_res nlm4svc_proc_null | |
480 | ||
481 | struct nlm_void { int dummy; }; | |
482 | ||
483 | #define PROC(name, xargt, xrest, argt, rest, respsize) \ | |
484 | { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ | |
485 | .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ | |
486 | .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ | |
487 | .pc_release = NULL, \ | |
488 | .pc_argsize = sizeof(struct nlm_##argt), \ | |
489 | .pc_ressize = sizeof(struct nlm_##rest), \ | |
490 | .pc_xdrressize = respsize, \ | |
491 | } | |
492 | #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ | |
493 | #define No (1+1024/4) /* netobj */ | |
494 | #define St 1 /* status */ | |
495 | #define Rg 4 /* range (offset + length) */ | |
496 | struct svc_procedure nlmsvc_procedures4[] = { | |
497 | PROC(null, void, void, void, void, 1), | |
498 | PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), | |
499 | PROC(lock, lockargs, res, args, res, Ck+St), | |
500 | PROC(cancel, cancargs, res, args, res, Ck+St), | |
501 | PROC(unlock, unlockargs, res, args, res, Ck+St), | |
502 | PROC(granted, testargs, res, args, res, Ck+St), | |
503 | PROC(test_msg, testargs, norep, args, void, 1), | |
504 | PROC(lock_msg, lockargs, norep, args, void, 1), | |
505 | PROC(cancel_msg, cancargs, norep, args, void, 1), | |
506 | PROC(unlock_msg, unlockargs, norep, args, void, 1), | |
507 | PROC(granted_msg, testargs, norep, args, void, 1), | |
508 | PROC(test_res, testres, norep, res, void, 1), | |
509 | PROC(lock_res, lockres, norep, res, void, 1), | |
510 | PROC(cancel_res, cancelres, norep, res, void, 1), | |
511 | PROC(unlock_res, unlockres, norep, res, void, 1), | |
512 | PROC(granted_res, res, norep, res, void, 1), | |
513 | /* statd callback */ | |
514 | PROC(sm_notify, reboot, void, reboot, void, 1), | |
515 | PROC(none, void, void, void, void, 0), | |
516 | PROC(none, void, void, void, void, 0), | |
517 | PROC(none, void, void, void, void, 0), | |
518 | PROC(share, shareargs, shareres, args, res, Ck+St+1), | |
519 | PROC(unshare, shareargs, shareres, args, res, Ck+St+1), | |
520 | PROC(nm_lock, lockargs, res, args, res, Ck+St), | |
521 | PROC(free_all, notify, void, args, void, 1), | |
522 | ||
523 | }; |