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/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 20 #define NLMDBG_FACILITY NLMDBG_CLIENT 21 22 #ifdef CONFIG_LOCKD_V4 23 static __be32 24 cast_to_nlm(__be32 status, u32 vers) 25 { 26 /* Note: status is assumed to be in network byte order !!! */ 27 if (vers != 4){ 28 switch (status) { 29 case nlm_granted: 30 case nlm_lck_denied: 31 case nlm_lck_denied_nolocks: 32 case nlm_lck_blocked: 33 case nlm_lck_denied_grace_period: 34 case nlm_drop_reply: 35 break; 36 case nlm4_deadlock: 37 status = nlm_lck_denied; 38 break; 39 default: 40 status = nlm_lck_denied_nolocks; 41 } 42 } 43 44 return (status); 45 } 46 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) 47 #else 48 #define cast_status(status) (status) 49 #endif 50 51 /* 52 * Obtain client and file from arguments 53 */ 54 static __be32 55 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 56 struct nlm_host **hostp, struct nlm_file **filp) 57 { 58 struct nlm_host *host = NULL; 59 struct nlm_file *file = NULL; 60 struct nlm_lock *lock = &argp->lock; 61 __be32 error = 0; 62 63 /* nfsd callbacks must have been installed for this procedure */ 64 if (!nlmsvc_ops) 65 return nlm_lck_denied_nolocks; 66 67 /* Obtain host handle */ 68 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 69 || (argp->monitor && nsm_monitor(host) < 0)) 70 goto no_locks; 71 *hostp = host; 72 73 /* Obtain file pointer. Not used by FREE_ALL call. */ 74 if (filp != NULL) { 75 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 76 goto no_locks; 77 *filp = file; 78 79 /* Set up the missing parts of the file_lock structure */ 80 lock->fl.fl_file = file->f_file; 81 lock->fl.fl_owner = (fl_owner_t) host; 82 lock->fl.fl_lmops = &nlmsvc_lock_operations; 83 } 84 85 return 0; 86 87 no_locks: 88 nlm_release_host(host); 89 if (error) 90 return error; 91 return nlm_lck_denied_nolocks; 92 } 93 94 /* 95 * NULL: Test for presence of service 96 */ 97 static __be32 98 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 99 { 100 dprintk("lockd: NULL called\n"); 101 return rpc_success; 102 } 103 104 /* 105 * TEST: Check for conflicting lock 106 */ 107 static __be32 108 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 109 struct nlm_res *resp) 110 { 111 struct nlm_host *host; 112 struct nlm_file *file; 113 __be32 rc = rpc_success; 114 115 dprintk("lockd: TEST called\n"); 116 resp->cookie = argp->cookie; 117 118 /* Obtain client and file */ 119 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 120 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 121 122 /* Now check for conflicting locks */ 123 resp->status = cast_status(nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie)); 124 if (resp->status == nlm_drop_reply) 125 rc = rpc_drop_reply; 126 else 127 dprintk("lockd: TEST status %d vers %d\n", 128 ntohl(resp->status), rqstp->rq_vers); 129 130 nlm_release_host(host); 131 nlm_release_file(file); 132 return rc; 133 } 134 135 static __be32 136 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 137 struct nlm_res *resp) 138 { 139 struct nlm_host *host; 140 struct nlm_file *file; 141 __be32 rc = rpc_success; 142 143 dprintk("lockd: LOCK called\n"); 144 145 resp->cookie = argp->cookie; 146 147 /* Obtain client and file */ 148 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 149 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 150 151 #if 0 152 /* If supplied state doesn't match current state, we assume it's 153 * an old request that time-warped somehow. Any error return would 154 * do in this case because it's irrelevant anyway. 155 * 156 * NB: We don't retrieve the remote host's state yet. 157 */ 158 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 159 resp->status = nlm_lck_denied_nolocks; 160 } else 161 #endif 162 163 /* Now try to lock the file */ 164 resp->status = cast_status(nlmsvc_lock(rqstp, file, host, &argp->lock, 165 argp->block, &argp->cookie, 166 argp->reclaim)); 167 if (resp->status == nlm_drop_reply) 168 rc = rpc_drop_reply; 169 else 170 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 171 172 nlm_release_host(host); 173 nlm_release_file(file); 174 return rc; 175 } 176 177 static __be32 178 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 179 struct nlm_res *resp) 180 { 181 struct nlm_host *host; 182 struct nlm_file *file; 183 184 dprintk("lockd: CANCEL called\n"); 185 186 resp->cookie = argp->cookie; 187 188 /* Don't accept requests during grace period */ 189 if (locks_in_grace()) { 190 resp->status = nlm_lck_denied_grace_period; 191 return rpc_success; 192 } 193 194 /* Obtain client and file */ 195 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 196 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 197 198 /* Try to cancel request. */ 199 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 200 201 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 202 nlm_release_host(host); 203 nlm_release_file(file); 204 return rpc_success; 205 } 206 207 /* 208 * UNLOCK: release a lock 209 */ 210 static __be32 211 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 212 struct nlm_res *resp) 213 { 214 struct nlm_host *host; 215 struct nlm_file *file; 216 217 dprintk("lockd: UNLOCK called\n"); 218 219 resp->cookie = argp->cookie; 220 221 /* Don't accept new lock requests during grace period */ 222 if (locks_in_grace()) { 223 resp->status = nlm_lck_denied_grace_period; 224 return rpc_success; 225 } 226 227 /* Obtain client and file */ 228 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 229 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 230 231 /* Now try to remove the lock */ 232 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 233 234 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 235 nlm_release_host(host); 236 nlm_release_file(file); 237 return rpc_success; 238 } 239 240 /* 241 * GRANTED: A server calls us to tell that a process' lock request 242 * was granted 243 */ 244 static __be32 245 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 246 struct nlm_res *resp) 247 { 248 resp->cookie = argp->cookie; 249 250 dprintk("lockd: GRANTED called\n"); 251 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 252 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 253 return rpc_success; 254 } 255 256 /* 257 * This is the generic lockd callback for async RPC calls 258 */ 259 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 260 { 261 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 262 -task->tk_status); 263 } 264 265 static void nlmsvc_callback_release(void *data) 266 { 267 lock_kernel(); 268 nlm_release_call(data); 269 unlock_kernel(); 270 } 271 272 static const struct rpc_call_ops nlmsvc_callback_ops = { 273 .rpc_call_done = nlmsvc_callback_exit, 274 .rpc_release = nlmsvc_callback_release, 275 }; 276 277 /* 278 * `Async' versions of the above service routines. They aren't really, 279 * because we send the callback before the reply proper. I hope this 280 * doesn't break any clients. 281 */ 282 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 283 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 284 { 285 struct nlm_host *host; 286 struct nlm_rqst *call; 287 __be32 stat; 288 289 host = nlmsvc_lookup_host(rqstp, 290 argp->lock.caller, 291 argp->lock.len); 292 if (host == NULL) 293 return rpc_system_err; 294 295 call = nlm_alloc_call(host); 296 if (call == NULL) 297 return rpc_system_err; 298 299 stat = func(rqstp, argp, &call->a_res); 300 if (stat != 0) { 301 nlm_release_call(call); 302 return stat; 303 } 304 305 call->a_flags = RPC_TASK_ASYNC; 306 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 307 return rpc_system_err; 308 return rpc_success; 309 } 310 311 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 312 void *resp) 313 { 314 dprintk("lockd: TEST_MSG called\n"); 315 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 316 } 317 318 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 319 void *resp) 320 { 321 dprintk("lockd: LOCK_MSG called\n"); 322 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 323 } 324 325 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 326 void *resp) 327 { 328 dprintk("lockd: CANCEL_MSG called\n"); 329 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 330 } 331 332 static __be32 333 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 334 void *resp) 335 { 336 dprintk("lockd: UNLOCK_MSG called\n"); 337 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 338 } 339 340 static __be32 341 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 342 void *resp) 343 { 344 dprintk("lockd: GRANTED_MSG called\n"); 345 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 346 } 347 348 /* 349 * SHARE: create a DOS share or alter existing share. 350 */ 351 static __be32 352 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 353 struct nlm_res *resp) 354 { 355 struct nlm_host *host; 356 struct nlm_file *file; 357 358 dprintk("lockd: SHARE called\n"); 359 360 resp->cookie = argp->cookie; 361 362 /* Don't accept new lock requests during grace period */ 363 if (locks_in_grace() && !argp->reclaim) { 364 resp->status = nlm_lck_denied_grace_period; 365 return rpc_success; 366 } 367 368 /* Obtain client and file */ 369 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 370 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 371 372 /* Now try to create the share */ 373 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 374 375 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 376 nlm_release_host(host); 377 nlm_release_file(file); 378 return rpc_success; 379 } 380 381 /* 382 * UNSHARE: Release a DOS share. 383 */ 384 static __be32 385 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 386 struct nlm_res *resp) 387 { 388 struct nlm_host *host; 389 struct nlm_file *file; 390 391 dprintk("lockd: UNSHARE called\n"); 392 393 resp->cookie = argp->cookie; 394 395 /* Don't accept requests during grace period */ 396 if (locks_in_grace()) { 397 resp->status = nlm_lck_denied_grace_period; 398 return rpc_success; 399 } 400 401 /* Obtain client and file */ 402 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 403 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 404 405 /* Now try to unshare the file */ 406 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 407 408 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 409 nlm_release_host(host); 410 nlm_release_file(file); 411 return rpc_success; 412 } 413 414 /* 415 * NM_LOCK: Create an unmonitored lock 416 */ 417 static __be32 418 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 419 struct nlm_res *resp) 420 { 421 dprintk("lockd: NM_LOCK called\n"); 422 423 argp->monitor = 0; /* just clean the monitor flag */ 424 return nlmsvc_proc_lock(rqstp, argp, resp); 425 } 426 427 /* 428 * FREE_ALL: Release all locks and shares held by client 429 */ 430 static __be32 431 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 432 void *resp) 433 { 434 struct nlm_host *host; 435 436 /* Obtain client */ 437 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 438 return rpc_success; 439 440 nlmsvc_free_host_resources(host); 441 nlm_release_host(host); 442 return rpc_success; 443 } 444 445 /* 446 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 447 */ 448 static __be32 449 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 450 void *resp) 451 { 452 dprintk("lockd: SM_NOTIFY called\n"); 453 454 if (!nlm_privileged_requester(rqstp)) { 455 char buf[RPC_MAX_ADDRBUFLEN]; 456 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 457 svc_print_addr(rqstp, buf, sizeof(buf))); 458 return rpc_system_err; 459 } 460 461 nlm_host_rebooted(argp); 462 return rpc_success; 463 } 464 465 /* 466 * client sent a GRANTED_RES, let's remove the associated block 467 */ 468 static __be32 469 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 470 void *resp) 471 { 472 if (!nlmsvc_ops) 473 return rpc_success; 474 475 dprintk("lockd: GRANTED_RES called\n"); 476 477 nlmsvc_grant_reply(&argp->cookie, argp->status); 478 return rpc_success; 479 } 480 481 /* 482 * NLM Server procedures. 483 */ 484 485 #define nlmsvc_encode_norep nlmsvc_encode_void 486 #define nlmsvc_decode_norep nlmsvc_decode_void 487 #define nlmsvc_decode_testres nlmsvc_decode_void 488 #define nlmsvc_decode_lockres nlmsvc_decode_void 489 #define nlmsvc_decode_unlockres nlmsvc_decode_void 490 #define nlmsvc_decode_cancelres nlmsvc_decode_void 491 #define nlmsvc_decode_grantedres nlmsvc_decode_void 492 493 #define nlmsvc_proc_none nlmsvc_proc_null 494 #define nlmsvc_proc_test_res nlmsvc_proc_null 495 #define nlmsvc_proc_lock_res nlmsvc_proc_null 496 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 497 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 498 499 struct nlm_void { int dummy; }; 500 501 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 502 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 503 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 504 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 505 .pc_release = NULL, \ 506 .pc_argsize = sizeof(struct nlm_##argt), \ 507 .pc_ressize = sizeof(struct nlm_##rest), \ 508 .pc_xdrressize = respsize, \ 509 } 510 511 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 512 #define St 1 /* status */ 513 #define No (1+1024/4) /* Net Obj */ 514 #define Rg 2 /* range - offset + size */ 515 516 struct svc_procedure nlmsvc_procedures[] = { 517 PROC(null, void, void, void, void, 1), 518 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 519 PROC(lock, lockargs, res, args, res, Ck+St), 520 PROC(cancel, cancargs, res, args, res, Ck+St), 521 PROC(unlock, unlockargs, res, args, res, Ck+St), 522 PROC(granted, testargs, res, args, res, Ck+St), 523 PROC(test_msg, testargs, norep, args, void, 1), 524 PROC(lock_msg, lockargs, norep, args, void, 1), 525 PROC(cancel_msg, cancargs, norep, args, void, 1), 526 PROC(unlock_msg, unlockargs, norep, args, void, 1), 527 PROC(granted_msg, testargs, norep, args, void, 1), 528 PROC(test_res, testres, norep, res, void, 1), 529 PROC(lock_res, lockres, norep, res, void, 1), 530 PROC(cancel_res, cancelres, norep, res, void, 1), 531 PROC(unlock_res, unlockres, norep, res, void, 1), 532 PROC(granted_res, res, norep, res, void, 1), 533 /* statd callback */ 534 PROC(sm_notify, reboot, void, reboot, void, 1), 535 PROC(none, void, void, void, void, 1), 536 PROC(none, void, void, void, void, 1), 537 PROC(none, void, void, void, void, 1), 538 PROC(share, shareargs, shareres, args, res, Ck+St+1), 539 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 540 PROC(nm_lock, lockargs, res, args, res, Ck+St), 541 PROC(free_all, notify, void, args, void, 0), 542 543 }; 544