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; 116 117 dprintk("lockd: TEST called\n"); 118 resp->cookie = argp->cookie; 119 120 /* Don't accept test requests during grace period */ 121 if (nlmsvc_grace_period) { 122 resp->status = nlm_lck_denied_grace_period; 123 return rpc_success; 124 } 125 126 /* Obtain client and file */ 127 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 128 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 129 130 /* Now check for conflicting locks */ 131 resp->status = cast_status(nlmsvc_testlock(rqstp, file, &argp->lock, &resp->lock, &resp->cookie)); 132 if (resp->status == nlm_drop_reply) 133 return rpc_drop_reply; 134 135 dprintk("lockd: TEST status %d vers %d\n", 136 ntohl(resp->status), rqstp->rq_vers); 137 nlm_release_host(host); 138 nlm_release_file(file); 139 return rpc_success; 140 } 141 142 static __be32 143 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 144 struct nlm_res *resp) 145 { 146 struct nlm_host *host; 147 struct nlm_file *file; 148 149 dprintk("lockd: LOCK called\n"); 150 151 resp->cookie = argp->cookie; 152 153 /* Don't accept new lock requests during grace period */ 154 if (nlmsvc_grace_period && !argp->reclaim) { 155 resp->status = nlm_lck_denied_grace_period; 156 return rpc_success; 157 } 158 159 /* Obtain client and file */ 160 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 161 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 162 163 #if 0 164 /* If supplied state doesn't match current state, we assume it's 165 * an old request that time-warped somehow. Any error return would 166 * do in this case because it's irrelevant anyway. 167 * 168 * NB: We don't retrieve the remote host's state yet. 169 */ 170 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 171 resp->status = nlm_lck_denied_nolocks; 172 } else 173 #endif 174 175 /* Now try to lock the file */ 176 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock, 177 argp->block, &argp->cookie)); 178 if (resp->status == nlm_drop_reply) 179 return rpc_drop_reply; 180 181 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 182 nlm_release_host(host); 183 nlm_release_file(file); 184 return rpc_success; 185 } 186 187 static __be32 188 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 189 struct nlm_res *resp) 190 { 191 struct nlm_host *host; 192 struct nlm_file *file; 193 194 dprintk("lockd: CANCEL called\n"); 195 196 resp->cookie = argp->cookie; 197 198 /* Don't accept requests during grace period */ 199 if (nlmsvc_grace_period) { 200 resp->status = nlm_lck_denied_grace_period; 201 return rpc_success; 202 } 203 204 /* Obtain client and file */ 205 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 206 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 207 208 /* Try to cancel request. */ 209 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 210 211 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 212 nlm_release_host(host); 213 nlm_release_file(file); 214 return rpc_success; 215 } 216 217 /* 218 * UNLOCK: release a lock 219 */ 220 static __be32 221 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 222 struct nlm_res *resp) 223 { 224 struct nlm_host *host; 225 struct nlm_file *file; 226 227 dprintk("lockd: UNLOCK called\n"); 228 229 resp->cookie = argp->cookie; 230 231 /* Don't accept new lock requests during grace period */ 232 if (nlmsvc_grace_period) { 233 resp->status = nlm_lck_denied_grace_period; 234 return rpc_success; 235 } 236 237 /* Obtain client and file */ 238 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 239 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 240 241 /* Now try to remove the lock */ 242 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 243 244 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 245 nlm_release_host(host); 246 nlm_release_file(file); 247 return rpc_success; 248 } 249 250 /* 251 * GRANTED: A server calls us to tell that a process' lock request 252 * was granted 253 */ 254 static __be32 255 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 256 struct nlm_res *resp) 257 { 258 resp->cookie = argp->cookie; 259 260 dprintk("lockd: GRANTED called\n"); 261 resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock); 262 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 263 return rpc_success; 264 } 265 266 /* 267 * This is the generic lockd callback for async RPC calls 268 */ 269 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 270 { 271 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 272 -task->tk_status); 273 } 274 275 static void nlmsvc_callback_release(void *data) 276 { 277 nlm_release_call(data); 278 } 279 280 static const struct rpc_call_ops nlmsvc_callback_ops = { 281 .rpc_call_done = nlmsvc_callback_exit, 282 .rpc_release = nlmsvc_callback_release, 283 }; 284 285 /* 286 * `Async' versions of the above service routines. They aren't really, 287 * because we send the callback before the reply proper. I hope this 288 * doesn't break any clients. 289 */ 290 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 291 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 292 { 293 struct nlm_host *host; 294 struct nlm_rqst *call; 295 __be32 stat; 296 297 host = nlmsvc_lookup_host(rqstp, 298 argp->lock.caller, 299 argp->lock.len); 300 if (host == NULL) 301 return rpc_system_err; 302 303 call = nlm_alloc_call(host); 304 if (call == NULL) 305 return rpc_system_err; 306 307 stat = func(rqstp, argp, &call->a_res); 308 if (stat != 0) { 309 nlm_release_call(call); 310 return stat; 311 } 312 313 call->a_flags = RPC_TASK_ASYNC; 314 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 315 return rpc_system_err; 316 return rpc_success; 317 } 318 319 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 320 void *resp) 321 { 322 dprintk("lockd: TEST_MSG called\n"); 323 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 324 } 325 326 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 327 void *resp) 328 { 329 dprintk("lockd: LOCK_MSG called\n"); 330 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 331 } 332 333 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 334 void *resp) 335 { 336 dprintk("lockd: CANCEL_MSG called\n"); 337 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 338 } 339 340 static __be32 341 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 342 void *resp) 343 { 344 dprintk("lockd: UNLOCK_MSG called\n"); 345 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 346 } 347 348 static __be32 349 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 350 void *resp) 351 { 352 dprintk("lockd: GRANTED_MSG called\n"); 353 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 354 } 355 356 /* 357 * SHARE: create a DOS share or alter existing share. 358 */ 359 static __be32 360 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 361 struct nlm_res *resp) 362 { 363 struct nlm_host *host; 364 struct nlm_file *file; 365 366 dprintk("lockd: SHARE called\n"); 367 368 resp->cookie = argp->cookie; 369 370 /* Don't accept new lock requests during grace period */ 371 if (nlmsvc_grace_period && !argp->reclaim) { 372 resp->status = nlm_lck_denied_grace_period; 373 return rpc_success; 374 } 375 376 /* Obtain client and file */ 377 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 378 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 379 380 /* Now try to create the share */ 381 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 382 383 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 384 nlm_release_host(host); 385 nlm_release_file(file); 386 return rpc_success; 387 } 388 389 /* 390 * UNSHARE: Release a DOS share. 391 */ 392 static __be32 393 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 394 struct nlm_res *resp) 395 { 396 struct nlm_host *host; 397 struct nlm_file *file; 398 399 dprintk("lockd: UNSHARE called\n"); 400 401 resp->cookie = argp->cookie; 402 403 /* Don't accept requests during grace period */ 404 if (nlmsvc_grace_period) { 405 resp->status = nlm_lck_denied_grace_period; 406 return rpc_success; 407 } 408 409 /* Obtain client and file */ 410 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 411 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 412 413 /* Now try to unshare the file */ 414 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 415 416 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 417 nlm_release_host(host); 418 nlm_release_file(file); 419 return rpc_success; 420 } 421 422 /* 423 * NM_LOCK: Create an unmonitored lock 424 */ 425 static __be32 426 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 427 struct nlm_res *resp) 428 { 429 dprintk("lockd: NM_LOCK called\n"); 430 431 argp->monitor = 0; /* just clean the monitor flag */ 432 return nlmsvc_proc_lock(rqstp, argp, resp); 433 } 434 435 /* 436 * FREE_ALL: Release all locks and shares held by client 437 */ 438 static __be32 439 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 440 void *resp) 441 { 442 struct nlm_host *host; 443 444 /* Obtain client */ 445 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 446 return rpc_success; 447 448 nlmsvc_free_host_resources(host); 449 nlm_release_host(host); 450 return rpc_success; 451 } 452 453 /* 454 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 455 */ 456 static __be32 457 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 458 void *resp) 459 { 460 struct sockaddr_in saddr; 461 462 memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr)); 463 464 dprintk("lockd: SM_NOTIFY called\n"); 465 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 466 || ntohs(saddr.sin_port) >= 1024) { 467 char buf[RPC_MAX_ADDRBUFLEN]; 468 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 469 svc_print_addr(rqstp, buf, sizeof(buf))); 470 return rpc_system_err; 471 } 472 473 /* Obtain the host pointer for this NFS server and try to 474 * reclaim all locks we hold on this server. 475 */ 476 memset(&saddr, 0, sizeof(saddr)); 477 saddr.sin_addr.s_addr = argp->addr; 478 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); 479 480 return rpc_success; 481 } 482 483 /* 484 * client sent a GRANTED_RES, let's remove the associated block 485 */ 486 static __be32 487 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 488 void *resp) 489 { 490 if (!nlmsvc_ops) 491 return rpc_success; 492 493 dprintk("lockd: GRANTED_RES called\n"); 494 495 nlmsvc_grant_reply(&argp->cookie, argp->status); 496 return rpc_success; 497 } 498 499 /* 500 * NLM Server procedures. 501 */ 502 503 #define nlmsvc_encode_norep nlmsvc_encode_void 504 #define nlmsvc_decode_norep nlmsvc_decode_void 505 #define nlmsvc_decode_testres nlmsvc_decode_void 506 #define nlmsvc_decode_lockres nlmsvc_decode_void 507 #define nlmsvc_decode_unlockres nlmsvc_decode_void 508 #define nlmsvc_decode_cancelres nlmsvc_decode_void 509 #define nlmsvc_decode_grantedres nlmsvc_decode_void 510 511 #define nlmsvc_proc_none nlmsvc_proc_null 512 #define nlmsvc_proc_test_res nlmsvc_proc_null 513 #define nlmsvc_proc_lock_res nlmsvc_proc_null 514 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 515 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 516 517 struct nlm_void { int dummy; }; 518 519 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 520 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 521 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 522 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 523 .pc_release = NULL, \ 524 .pc_argsize = sizeof(struct nlm_##argt), \ 525 .pc_ressize = sizeof(struct nlm_##rest), \ 526 .pc_xdrressize = respsize, \ 527 } 528 529 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 530 #define St 1 /* status */ 531 #define No (1+1024/4) /* Net Obj */ 532 #define Rg 2 /* range - offset + size */ 533 534 struct svc_procedure nlmsvc_procedures[] = { 535 PROC(null, void, void, void, void, 1), 536 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 537 PROC(lock, lockargs, res, args, res, Ck+St), 538 PROC(cancel, cancargs, res, args, res, Ck+St), 539 PROC(unlock, unlockargs, res, args, res, Ck+St), 540 PROC(granted, testargs, res, args, res, Ck+St), 541 PROC(test_msg, testargs, norep, args, void, 1), 542 PROC(lock_msg, lockargs, norep, args, void, 1), 543 PROC(cancel_msg, cancargs, norep, args, void, 1), 544 PROC(unlock_msg, unlockargs, norep, args, void, 1), 545 PROC(granted_msg, testargs, norep, args, void, 1), 546 PROC(test_res, testres, norep, res, void, 1), 547 PROC(lock_res, lockres, norep, res, void, 1), 548 PROC(cancel_res, cancelres, norep, res, void, 1), 549 PROC(unlock_res, unlockres, norep, res, void, 1), 550 PROC(granted_res, res, norep, res, void, 1), 551 /* statd callback */ 552 PROC(sm_notify, reboot, void, reboot, void, 1), 553 PROC(none, void, void, void, void, 1), 554 PROC(none, void, void, void, void, 1), 555 PROC(none, void, void, void, void, 1), 556 PROC(share, shareargs, shareres, args, res, Ck+St+1), 557 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 558 PROC(nm_lock, lockargs, res, args, res, Ck+St), 559 PROC(free_all, notify, void, args, void, 0), 560 561 }; 562