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 #include <linux/lockd/sm_inter.h> 20 21 22 #define NLMDBG_FACILITY NLMDBG_CLIENT 23 24 #ifdef CONFIG_LOCKD_V4 25 static __be32 26 cast_to_nlm(__be32 status, u32 vers) 27 { 28 /* Note: status is assumed to be in network byte order !!! */ 29 if (vers != 4){ 30 switch (status) { 31 case nlm_granted: 32 case nlm_lck_denied: 33 case nlm_lck_denied_nolocks: 34 case nlm_lck_blocked: 35 case nlm_lck_denied_grace_period: 36 case nlm_drop_reply: 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 __be32 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 __be32 error = 0; 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, lock->caller, lock->len)) 71 || (argp->monitor && 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 if (error) 93 return error; 94 return nlm_lck_denied_nolocks; 95 } 96 97 /* 98 * NULL: Test for presence of service 99 */ 100 static __be32 101 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 102 { 103 dprintk("lockd: NULL called\n"); 104 return rpc_success; 105 } 106 107 /* 108 * TEST: Check for conflicting lock 109 */ 110 static __be32 111 nlmsvc_proc_test(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 int rc = rpc_success; 117 118 dprintk("lockd: TEST called\n"); 119 resp->cookie = argp->cookie; 120 121 /* Don't accept test requests during grace period */ 122 if (nlmsvc_grace_period) { 123 resp->status = nlm_lck_denied_grace_period; 124 return rc; 125 } 126 127 /* Obtain client and file */ 128 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 129 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 130 131 /* Now check for conflicting locks */ 132 resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie)); 133 if (resp->status == nlm_drop_reply) 134 rc = rpc_drop_reply; 135 else 136 dprintk("lockd: TEST status %d vers %d\n", 137 ntohl(resp->status), rqstp->rq_vers); 138 139 nlm_release_host(host); 140 nlm_release_file(file); 141 return rc; 142 } 143 144 static __be32 145 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 146 struct nlm_res *resp) 147 { 148 struct nlm_host *host; 149 struct nlm_file *file; 150 int rc = rpc_success; 151 152 dprintk("lockd: LOCK called\n"); 153 154 resp->cookie = argp->cookie; 155 156 /* Don't accept new lock requests during grace period */ 157 if (nlmsvc_grace_period && !argp->reclaim) { 158 resp->status = nlm_lck_denied_grace_period; 159 return rc; 160 } 161 162 /* Obtain client and file */ 163 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 164 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 165 166 #if 0 167 /* If supplied state doesn't match current state, we assume it's 168 * an old request that time-warped somehow. Any error return would 169 * do in this case because it's irrelevant anyway. 170 * 171 * NB: We don't retrieve the remote host's state yet. 172 */ 173 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 174 resp->status = nlm_lck_denied_nolocks; 175 } else 176 #endif 177 178 /* Now try to lock the file */ 179 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock, 180 argp->block, &argp->cookie)); 181 if (resp->status == nlm_drop_reply) 182 rc = rpc_drop_reply; 183 else 184 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 185 186 nlm_release_host(host); 187 nlm_release_file(file); 188 return rc; 189 } 190 191 static __be32 192 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 193 struct nlm_res *resp) 194 { 195 struct nlm_host *host; 196 struct nlm_file *file; 197 198 dprintk("lockd: CANCEL called\n"); 199 200 resp->cookie = argp->cookie; 201 202 /* Don't accept requests during grace period */ 203 if (nlmsvc_grace_period) { 204 resp->status = nlm_lck_denied_grace_period; 205 return rpc_success; 206 } 207 208 /* Obtain client and file */ 209 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 210 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 211 212 /* Try to cancel request. */ 213 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 214 215 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 216 nlm_release_host(host); 217 nlm_release_file(file); 218 return rpc_success; 219 } 220 221 /* 222 * UNLOCK: release a lock 223 */ 224 static __be32 225 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 226 struct nlm_res *resp) 227 { 228 struct nlm_host *host; 229 struct nlm_file *file; 230 231 dprintk("lockd: UNLOCK called\n"); 232 233 resp->cookie = argp->cookie; 234 235 /* Don't accept new lock requests during grace period */ 236 if (nlmsvc_grace_period) { 237 resp->status = nlm_lck_denied_grace_period; 238 return rpc_success; 239 } 240 241 /* Obtain client and file */ 242 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 243 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 244 245 /* Now try to remove the lock */ 246 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 247 248 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 249 nlm_release_host(host); 250 nlm_release_file(file); 251 return rpc_success; 252 } 253 254 /* 255 * GRANTED: A server calls us to tell that a process' lock request 256 * was granted 257 */ 258 static __be32 259 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 260 struct nlm_res *resp) 261 { 262 resp->cookie = argp->cookie; 263 264 dprintk("lockd: GRANTED called\n"); 265 resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock); 266 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 267 return rpc_success; 268 } 269 270 /* 271 * This is the generic lockd callback for async RPC calls 272 */ 273 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 274 { 275 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 276 -task->tk_status); 277 } 278 279 static void nlmsvc_callback_release(void *data) 280 { 281 nlm_release_call(data); 282 } 283 284 static const struct rpc_call_ops nlmsvc_callback_ops = { 285 .rpc_call_done = nlmsvc_callback_exit, 286 .rpc_release = nlmsvc_callback_release, 287 }; 288 289 /* 290 * `Async' versions of the above service routines. They aren't really, 291 * because we send the callback before the reply proper. I hope this 292 * doesn't break any clients. 293 */ 294 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 295 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 296 { 297 struct nlm_host *host; 298 struct nlm_rqst *call; 299 __be32 stat; 300 301 host = nlmsvc_lookup_host(rqstp, 302 argp->lock.caller, 303 argp->lock.len); 304 if (host == NULL) 305 return rpc_system_err; 306 307 call = nlm_alloc_call(host); 308 if (call == NULL) 309 return rpc_system_err; 310 311 stat = func(rqstp, argp, &call->a_res); 312 if (stat != 0) { 313 nlm_release_call(call); 314 return stat; 315 } 316 317 call->a_flags = RPC_TASK_ASYNC; 318 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 319 return rpc_system_err; 320 return rpc_success; 321 } 322 323 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 324 void *resp) 325 { 326 dprintk("lockd: TEST_MSG called\n"); 327 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 328 } 329 330 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 331 void *resp) 332 { 333 dprintk("lockd: LOCK_MSG called\n"); 334 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 335 } 336 337 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 338 void *resp) 339 { 340 dprintk("lockd: CANCEL_MSG called\n"); 341 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 342 } 343 344 static __be32 345 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 346 void *resp) 347 { 348 dprintk("lockd: UNLOCK_MSG called\n"); 349 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 350 } 351 352 static __be32 353 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 354 void *resp) 355 { 356 dprintk("lockd: GRANTED_MSG called\n"); 357 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 358 } 359 360 /* 361 * SHARE: create a DOS share or alter existing share. 362 */ 363 static __be32 364 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 365 struct nlm_res *resp) 366 { 367 struct nlm_host *host; 368 struct nlm_file *file; 369 370 dprintk("lockd: SHARE called\n"); 371 372 resp->cookie = argp->cookie; 373 374 /* Don't accept new lock requests during grace period */ 375 if (nlmsvc_grace_period && !argp->reclaim) { 376 resp->status = nlm_lck_denied_grace_period; 377 return rpc_success; 378 } 379 380 /* Obtain client and file */ 381 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 382 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 383 384 /* Now try to create the share */ 385 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 386 387 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 388 nlm_release_host(host); 389 nlm_release_file(file); 390 return rpc_success; 391 } 392 393 /* 394 * UNSHARE: Release a DOS share. 395 */ 396 static __be32 397 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 398 struct nlm_res *resp) 399 { 400 struct nlm_host *host; 401 struct nlm_file *file; 402 403 dprintk("lockd: UNSHARE called\n"); 404 405 resp->cookie = argp->cookie; 406 407 /* Don't accept requests during grace period */ 408 if (nlmsvc_grace_period) { 409 resp->status = nlm_lck_denied_grace_period; 410 return rpc_success; 411 } 412 413 /* Obtain client and file */ 414 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 415 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 416 417 /* Now try to unshare the file */ 418 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 419 420 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 421 nlm_release_host(host); 422 nlm_release_file(file); 423 return rpc_success; 424 } 425 426 /* 427 * NM_LOCK: Create an unmonitored lock 428 */ 429 static __be32 430 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 431 struct nlm_res *resp) 432 { 433 dprintk("lockd: NM_LOCK called\n"); 434 435 argp->monitor = 0; /* just clean the monitor flag */ 436 return nlmsvc_proc_lock(rqstp, argp, resp); 437 } 438 439 /* 440 * FREE_ALL: Release all locks and shares held by client 441 */ 442 static __be32 443 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 444 void *resp) 445 { 446 struct nlm_host *host; 447 448 /* Obtain client */ 449 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 450 return rpc_success; 451 452 nlmsvc_free_host_resources(host); 453 nlm_release_host(host); 454 return rpc_success; 455 } 456 457 /* 458 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 459 */ 460 static __be32 461 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 462 void *resp) 463 { 464 struct sockaddr_in saddr; 465 466 memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr)); 467 468 dprintk("lockd: SM_NOTIFY called\n"); 469 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 470 || ntohs(saddr.sin_port) >= 1024) { 471 char buf[RPC_MAX_ADDRBUFLEN]; 472 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 473 svc_print_addr(rqstp, buf, sizeof(buf))); 474 return rpc_system_err; 475 } 476 477 /* Obtain the host pointer for this NFS server and try to 478 * reclaim all locks we hold on this server. 479 */ 480 memset(&saddr, 0, sizeof(saddr)); 481 saddr.sin_addr.s_addr = argp->addr; 482 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); 483 484 return rpc_success; 485 } 486 487 /* 488 * client sent a GRANTED_RES, let's remove the associated block 489 */ 490 static __be32 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(&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