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/config.h> 11 #include <linux/types.h> 12 #include <linux/time.h> 13 #include <linux/slab.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 #include <linux/lockd/sm_inter.h> 21 22 23 #define NLMDBG_FACILITY NLMDBG_CLIENT 24 25 #ifdef CONFIG_LOCKD_V4 26 static u32 27 cast_to_nlm(u32 status, u32 vers) 28 { 29 /* Note: status is assumed to be in network byte order !!! */ 30 if (vers != 4){ 31 switch (status) { 32 case nlm_granted: 33 case nlm_lck_denied: 34 case nlm_lck_denied_nolocks: 35 case nlm_lck_blocked: 36 case nlm_lck_denied_grace_period: 37 break; 38 case nlm4_deadlock: 39 status = nlm_lck_denied; 40 break; 41 default: 42 status = nlm_lck_denied_nolocks; 43 } 44 } 45 46 return (status); 47 } 48 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) 49 #else 50 #define cast_status(status) (status) 51 #endif 52 53 /* 54 * Obtain client and file from arguments 55 */ 56 static u32 57 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 58 struct nlm_host **hostp, struct nlm_file **filp) 59 { 60 struct nlm_host *host = NULL; 61 struct nlm_file *file = NULL; 62 struct nlm_lock *lock = &argp->lock; 63 u32 error; 64 65 /* nfsd callbacks must have been installed for this procedure */ 66 if (!nlmsvc_ops) 67 return nlm_lck_denied_nolocks; 68 69 /* Obtain host handle */ 70 if (!(host = nlmsvc_lookup_host(rqstp)) 71 || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0)) 72 goto no_locks; 73 *hostp = host; 74 75 /* Obtain file pointer. Not used by FREE_ALL call. */ 76 if (filp != NULL) { 77 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 78 goto no_locks; 79 *filp = file; 80 81 /* Set up the missing parts of the file_lock structure */ 82 lock->fl.fl_file = file->f_file; 83 lock->fl.fl_owner = (fl_owner_t) host; 84 lock->fl.fl_lmops = &nlmsvc_lock_operations; 85 } 86 87 return 0; 88 89 no_locks: 90 if (host) 91 nlm_release_host(host); 92 return nlm_lck_denied_nolocks; 93 } 94 95 /* 96 * NULL: Test for presence of service 97 */ 98 static int 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 int 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; 114 115 dprintk("lockd: TEST called\n"); 116 resp->cookie = argp->cookie; 117 118 /* Don't accept test requests during grace period */ 119 if (nlmsvc_grace_period) { 120 resp->status = nlm_lck_denied_grace_period; 121 return rpc_success; 122 } 123 124 /* Obtain client and file */ 125 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 126 return rpc_success; 127 128 /* Now check for conflicting locks */ 129 resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock)); 130 131 dprintk("lockd: TEST status %d vers %d\n", 132 ntohl(resp->status), rqstp->rq_vers); 133 nlm_release_host(host); 134 nlm_release_file(file); 135 return rpc_success; 136 } 137 138 static int 139 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 140 struct nlm_res *resp) 141 { 142 struct nlm_host *host; 143 struct nlm_file *file; 144 145 dprintk("lockd: LOCK called\n"); 146 147 resp->cookie = argp->cookie; 148 149 /* Don't accept new lock requests during grace period */ 150 if (nlmsvc_grace_period && !argp->reclaim) { 151 resp->status = nlm_lck_denied_grace_period; 152 return rpc_success; 153 } 154 155 /* Obtain client and file */ 156 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 157 return rpc_success; 158 159 #if 0 160 /* If supplied state doesn't match current state, we assume it's 161 * an old request that time-warped somehow. Any error return would 162 * do in this case because it's irrelevant anyway. 163 * 164 * NB: We don't retrieve the remote host's state yet. 165 */ 166 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 167 resp->status = nlm_lck_denied_nolocks; 168 } else 169 #endif 170 171 /* Now try to lock the file */ 172 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock, 173 argp->block, &argp->cookie)); 174 175 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 176 nlm_release_host(host); 177 nlm_release_file(file); 178 return rpc_success; 179 } 180 181 static int 182 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 183 struct nlm_res *resp) 184 { 185 struct nlm_host *host; 186 struct nlm_file *file; 187 188 dprintk("lockd: CANCEL called\n"); 189 190 resp->cookie = argp->cookie; 191 192 /* Don't accept requests during grace period */ 193 if (nlmsvc_grace_period) { 194 resp->status = nlm_lck_denied_grace_period; 195 return rpc_success; 196 } 197 198 /* Obtain client and file */ 199 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 200 return rpc_success; 201 202 /* Try to cancel request. */ 203 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 204 205 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 206 nlm_release_host(host); 207 nlm_release_file(file); 208 return rpc_success; 209 } 210 211 /* 212 * UNLOCK: release a lock 213 */ 214 static int 215 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 216 struct nlm_res *resp) 217 { 218 struct nlm_host *host; 219 struct nlm_file *file; 220 221 dprintk("lockd: UNLOCK called\n"); 222 223 resp->cookie = argp->cookie; 224 225 /* Don't accept new lock requests during grace period */ 226 if (nlmsvc_grace_period) { 227 resp->status = nlm_lck_denied_grace_period; 228 return rpc_success; 229 } 230 231 /* Obtain client and file */ 232 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 233 return rpc_success; 234 235 /* Now try to remove the lock */ 236 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 237 238 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 239 nlm_release_host(host); 240 nlm_release_file(file); 241 return rpc_success; 242 } 243 244 /* 245 * GRANTED: A server calls us to tell that a process' lock request 246 * was granted 247 */ 248 static int 249 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 250 struct nlm_res *resp) 251 { 252 resp->cookie = argp->cookie; 253 254 dprintk("lockd: GRANTED called\n"); 255 resp->status = nlmclnt_grant(&rqstp->rq_addr, &argp->lock); 256 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 257 return rpc_success; 258 } 259 260 /* 261 * This is the generic lockd callback for async RPC calls 262 */ 263 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 264 { 265 dprintk("lockd: %4d callback returned %d\n", task->tk_pid, 266 -task->tk_status); 267 } 268 269 static void nlmsvc_callback_release(void *data) 270 { 271 nlm_release_call(data); 272 } 273 274 static const struct rpc_call_ops nlmsvc_callback_ops = { 275 .rpc_call_done = nlmsvc_callback_exit, 276 .rpc_release = nlmsvc_callback_release, 277 }; 278 279 /* 280 * `Async' versions of the above service routines. They aren't really, 281 * because we send the callback before the reply proper. I hope this 282 * doesn't break any clients. 283 */ 284 static int nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 285 int (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 286 { 287 struct nlm_host *host; 288 struct nlm_rqst *call; 289 int stat; 290 291 host = nlmsvc_lookup_host(rqstp); 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 int 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 int 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 int 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 int 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 int 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 int 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 (nlmsvc_grace_period && !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 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 int 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 (nlmsvc_grace_period) { 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 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 int 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 int 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 int 449 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 450 void *resp) 451 { 452 struct sockaddr_in saddr = rqstp->rq_addr; 453 int vers = argp->vers; 454 int prot = argp->proto >> 1; 455 struct nlm_host *host; 456 457 dprintk("lockd: SM_NOTIFY called\n"); 458 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 459 || ntohs(saddr.sin_port) >= 1024) { 460 printk(KERN_WARNING 461 "lockd: rejected NSM callback from %08x:%d\n", 462 ntohl(rqstp->rq_addr.sin_addr.s_addr), 463 ntohs(rqstp->rq_addr.sin_port)); 464 return rpc_system_err; 465 } 466 467 /* Obtain the host pointer for this NFS server and try to 468 * reclaim all locks we hold on this server. 469 */ 470 saddr.sin_addr.s_addr = argp->addr; 471 if ((argp->proto & 1)==0) { 472 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) { 473 nlmclnt_recovery(host, argp->state); 474 nlm_release_host(host); 475 } 476 } else { 477 /* If we run on an NFS server, delete all locks held by the client */ 478 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) { 479 nlmsvc_free_host_resources(host); 480 nlm_release_host(host); 481 } 482 } 483 484 return rpc_success; 485 } 486 487 /* 488 * client sent a GRANTED_RES, let's remove the associated block 489 */ 490 static int 491 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 492 void *resp) 493 { 494 if (!nlmsvc_ops) 495 return rpc_success; 496 497 dprintk("lockd: GRANTED_RES called\n"); 498 499 nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); 500 return rpc_success; 501 } 502 503 /* 504 * NLM Server procedures. 505 */ 506 507 #define nlmsvc_encode_norep nlmsvc_encode_void 508 #define nlmsvc_decode_norep nlmsvc_decode_void 509 #define nlmsvc_decode_testres nlmsvc_decode_void 510 #define nlmsvc_decode_lockres nlmsvc_decode_void 511 #define nlmsvc_decode_unlockres nlmsvc_decode_void 512 #define nlmsvc_decode_cancelres nlmsvc_decode_void 513 #define nlmsvc_decode_grantedres nlmsvc_decode_void 514 515 #define nlmsvc_proc_none nlmsvc_proc_null 516 #define nlmsvc_proc_test_res nlmsvc_proc_null 517 #define nlmsvc_proc_lock_res nlmsvc_proc_null 518 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 519 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 520 521 struct nlm_void { int dummy; }; 522 523 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 524 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 525 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 526 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 527 .pc_release = NULL, \ 528 .pc_argsize = sizeof(struct nlm_##argt), \ 529 .pc_ressize = sizeof(struct nlm_##rest), \ 530 .pc_xdrressize = respsize, \ 531 } 532 533 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 534 #define St 1 /* status */ 535 #define No (1+1024/4) /* Net Obj */ 536 #define Rg 2 /* range - offset + size */ 537 538 struct svc_procedure nlmsvc_procedures[] = { 539 PROC(null, void, void, void, void, 1), 540 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 541 PROC(lock, lockargs, res, args, res, Ck+St), 542 PROC(cancel, cancargs, res, args, res, Ck+St), 543 PROC(unlock, unlockargs, res, args, res, Ck+St), 544 PROC(granted, testargs, res, args, res, Ck+St), 545 PROC(test_msg, testargs, norep, args, void, 1), 546 PROC(lock_msg, lockargs, norep, args, void, 1), 547 PROC(cancel_msg, cancargs, norep, args, void, 1), 548 PROC(unlock_msg, unlockargs, norep, args, void, 1), 549 PROC(granted_msg, testargs, norep, args, void, 1), 550 PROC(test_res, testres, norep, res, void, 1), 551 PROC(lock_res, lockres, norep, res, void, 1), 552 PROC(cancel_res, cancelres, norep, res, void, 1), 553 PROC(unlock_res, unlockres, norep, res, void, 1), 554 PROC(granted_res, res, norep, res, void, 1), 555 /* statd callback */ 556 PROC(sm_notify, reboot, void, reboot, void, 1), 557 PROC(none, void, void, void, void, 1), 558 PROC(none, void, void, void, void, 1), 559 PROC(none, void, void, void, void, 1), 560 PROC(share, shareargs, shareres, args, res, Ck+St+1), 561 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 562 PROC(nm_lock, lockargs, res, args, res, Ck+St), 563 PROC(free_all, notify, void, args, void, 0), 564 565 }; 566