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 break; 37 case nlm4_deadlock: 38 status = nlm_lck_denied; 39 break; 40 default: 41 status = nlm_lck_denied_nolocks; 42 } 43 } 44 45 return (status); 46 } 47 #define cast_status(status) (cast_to_nlm(status, rqstp->rq_vers)) 48 #else 49 #define cast_status(status) (status) 50 #endif 51 52 /* 53 * Obtain client and file from arguments 54 */ 55 static __be32 56 nlmsvc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 57 struct nlm_host **hostp, struct nlm_file **filp) 58 { 59 struct nlm_host *host = NULL; 60 struct nlm_file *file = NULL; 61 struct nlm_lock *lock = &argp->lock; 62 __be32 error = 0; 63 64 /* nfsd callbacks must have been installed for this procedure */ 65 if (!nlmsvc_ops) 66 return nlm_lck_denied_nolocks; 67 68 /* Obtain host handle */ 69 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 70 || (argp->monitor && nsm_monitor(host) < 0)) 71 goto no_locks; 72 *hostp = host; 73 74 /* Obtain file pointer. Not used by FREE_ALL call. */ 75 if (filp != NULL) { 76 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 77 goto no_locks; 78 *filp = file; 79 80 /* Set up the missing parts of the file_lock structure */ 81 lock->fl.fl_file = file->f_file; 82 lock->fl.fl_owner = (fl_owner_t) host; 83 lock->fl.fl_lmops = &nlmsvc_lock_operations; 84 } 85 86 return 0; 87 88 no_locks: 89 if (host) 90 nlm_release_host(host); 91 if (error) 92 return error; 93 return nlm_lck_denied_nolocks; 94 } 95 96 /* 97 * NULL: Test for presence of service 98 */ 99 static __be32 100 nlmsvc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 101 { 102 dprintk("lockd: NULL called\n"); 103 return rpc_success; 104 } 105 106 /* 107 * TEST: Check for conflicting lock 108 */ 109 static __be32 110 nlmsvc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 111 struct nlm_res *resp) 112 { 113 struct nlm_host *host; 114 struct nlm_file *file; 115 116 dprintk("lockd: TEST called\n"); 117 resp->cookie = argp->cookie; 118 119 /* Don't accept test requests during grace period */ 120 if (nlmsvc_grace_period) { 121 resp->status = nlm_lck_denied_grace_period; 122 return rpc_success; 123 } 124 125 /* Obtain client and file */ 126 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 127 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 128 129 /* Now check for conflicting locks */ 130 resp->status = cast_status(nlmsvc_testlock(file, &argp->lock, &resp->lock)); 131 132 dprintk("lockd: TEST status %d vers %d\n", 133 ntohl(resp->status), rqstp->rq_vers); 134 nlm_release_host(host); 135 nlm_release_file(file); 136 return rpc_success; 137 } 138 139 static __be32 140 nlmsvc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 141 struct nlm_res *resp) 142 { 143 struct nlm_host *host; 144 struct nlm_file *file; 145 146 dprintk("lockd: LOCK called\n"); 147 148 resp->cookie = argp->cookie; 149 150 /* Don't accept new lock requests during grace period */ 151 if (nlmsvc_grace_period && !argp->reclaim) { 152 resp->status = nlm_lck_denied_grace_period; 153 return rpc_success; 154 } 155 156 /* Obtain client and file */ 157 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 158 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 159 160 #if 0 161 /* If supplied state doesn't match current state, we assume it's 162 * an old request that time-warped somehow. Any error return would 163 * do in this case because it's irrelevant anyway. 164 * 165 * NB: We don't retrieve the remote host's state yet. 166 */ 167 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 168 resp->status = nlm_lck_denied_nolocks; 169 } else 170 #endif 171 172 /* Now try to lock the file */ 173 resp->status = cast_status(nlmsvc_lock(rqstp, file, &argp->lock, 174 argp->block, &argp->cookie)); 175 176 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 177 nlm_release_host(host); 178 nlm_release_file(file); 179 return rpc_success; 180 } 181 182 static __be32 183 nlmsvc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 184 struct nlm_res *resp) 185 { 186 struct nlm_host *host; 187 struct nlm_file *file; 188 189 dprintk("lockd: CANCEL called\n"); 190 191 resp->cookie = argp->cookie; 192 193 /* Don't accept requests during grace period */ 194 if (nlmsvc_grace_period) { 195 resp->status = nlm_lck_denied_grace_period; 196 return rpc_success; 197 } 198 199 /* Obtain client and file */ 200 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 201 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 202 203 /* Try to cancel request. */ 204 resp->status = cast_status(nlmsvc_cancel_blocked(file, &argp->lock)); 205 206 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 207 nlm_release_host(host); 208 nlm_release_file(file); 209 return rpc_success; 210 } 211 212 /* 213 * UNLOCK: release a lock 214 */ 215 static __be32 216 nlmsvc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 217 struct nlm_res *resp) 218 { 219 struct nlm_host *host; 220 struct nlm_file *file; 221 222 dprintk("lockd: UNLOCK called\n"); 223 224 resp->cookie = argp->cookie; 225 226 /* Don't accept new lock requests during grace period */ 227 if (nlmsvc_grace_period) { 228 resp->status = nlm_lck_denied_grace_period; 229 return rpc_success; 230 } 231 232 /* Obtain client and file */ 233 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 234 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 235 236 /* Now try to remove the lock */ 237 resp->status = cast_status(nlmsvc_unlock(file, &argp->lock)); 238 239 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 240 nlm_release_host(host); 241 nlm_release_file(file); 242 return rpc_success; 243 } 244 245 /* 246 * GRANTED: A server calls us to tell that a process' lock request 247 * was granted 248 */ 249 static __be32 250 nlmsvc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 251 struct nlm_res *resp) 252 { 253 resp->cookie = argp->cookie; 254 255 dprintk("lockd: GRANTED called\n"); 256 resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock); 257 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 258 return rpc_success; 259 } 260 261 /* 262 * This is the generic lockd callback for async RPC calls 263 */ 264 static void nlmsvc_callback_exit(struct rpc_task *task, void *data) 265 { 266 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 267 -task->tk_status); 268 } 269 270 static void nlmsvc_callback_release(void *data) 271 { 272 nlm_release_call(data); 273 } 274 275 static const struct rpc_call_ops nlmsvc_callback_ops = { 276 .rpc_call_done = nlmsvc_callback_exit, 277 .rpc_release = nlmsvc_callback_release, 278 }; 279 280 /* 281 * `Async' versions of the above service routines. They aren't really, 282 * because we send the callback before the reply proper. I hope this 283 * doesn't break any clients. 284 */ 285 static __be32 nlmsvc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 286 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 287 { 288 struct nlm_host *host; 289 struct nlm_rqst *call; 290 __be32 stat; 291 292 host = nlmsvc_lookup_host(rqstp, 293 argp->lock.caller, 294 argp->lock.len); 295 if (host == NULL) 296 return rpc_system_err; 297 298 call = nlm_alloc_call(host); 299 if (call == NULL) 300 return rpc_system_err; 301 302 stat = func(rqstp, argp, &call->a_res); 303 if (stat != 0) { 304 nlm_release_call(call); 305 return stat; 306 } 307 308 call->a_flags = RPC_TASK_ASYNC; 309 if (nlm_async_reply(call, proc, &nlmsvc_callback_ops) < 0) 310 return rpc_system_err; 311 return rpc_success; 312 } 313 314 static __be32 nlmsvc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 315 void *resp) 316 { 317 dprintk("lockd: TEST_MSG called\n"); 318 return nlmsvc_callback(rqstp, NLMPROC_TEST_RES, argp, nlmsvc_proc_test); 319 } 320 321 static __be32 nlmsvc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 322 void *resp) 323 { 324 dprintk("lockd: LOCK_MSG called\n"); 325 return nlmsvc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlmsvc_proc_lock); 326 } 327 328 static __be32 nlmsvc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 329 void *resp) 330 { 331 dprintk("lockd: CANCEL_MSG called\n"); 332 return nlmsvc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlmsvc_proc_cancel); 333 } 334 335 static __be32 336 nlmsvc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 337 void *resp) 338 { 339 dprintk("lockd: UNLOCK_MSG called\n"); 340 return nlmsvc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlmsvc_proc_unlock); 341 } 342 343 static __be32 344 nlmsvc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 345 void *resp) 346 { 347 dprintk("lockd: GRANTED_MSG called\n"); 348 return nlmsvc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlmsvc_proc_granted); 349 } 350 351 /* 352 * SHARE: create a DOS share or alter existing share. 353 */ 354 static __be32 355 nlmsvc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 356 struct nlm_res *resp) 357 { 358 struct nlm_host *host; 359 struct nlm_file *file; 360 361 dprintk("lockd: SHARE called\n"); 362 363 resp->cookie = argp->cookie; 364 365 /* Don't accept new lock requests during grace period */ 366 if (nlmsvc_grace_period && !argp->reclaim) { 367 resp->status = nlm_lck_denied_grace_period; 368 return rpc_success; 369 } 370 371 /* Obtain client and file */ 372 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 373 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 374 375 /* Now try to create the share */ 376 resp->status = cast_status(nlmsvc_share_file(host, file, argp)); 377 378 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 379 nlm_release_host(host); 380 nlm_release_file(file); 381 return rpc_success; 382 } 383 384 /* 385 * UNSHARE: Release a DOS share. 386 */ 387 static __be32 388 nlmsvc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 389 struct nlm_res *resp) 390 { 391 struct nlm_host *host; 392 struct nlm_file *file; 393 394 dprintk("lockd: UNSHARE called\n"); 395 396 resp->cookie = argp->cookie; 397 398 /* Don't accept requests during grace period */ 399 if (nlmsvc_grace_period) { 400 resp->status = nlm_lck_denied_grace_period; 401 return rpc_success; 402 } 403 404 /* Obtain client and file */ 405 if ((resp->status = nlmsvc_retrieve_args(rqstp, argp, &host, &file))) 406 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 407 408 /* Now try to unshare the file */ 409 resp->status = cast_status(nlmsvc_unshare_file(host, file, argp)); 410 411 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 412 nlm_release_host(host); 413 nlm_release_file(file); 414 return rpc_success; 415 } 416 417 /* 418 * NM_LOCK: Create an unmonitored lock 419 */ 420 static __be32 421 nlmsvc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 422 struct nlm_res *resp) 423 { 424 dprintk("lockd: NM_LOCK called\n"); 425 426 argp->monitor = 0; /* just clean the monitor flag */ 427 return nlmsvc_proc_lock(rqstp, argp, resp); 428 } 429 430 /* 431 * FREE_ALL: Release all locks and shares held by client 432 */ 433 static __be32 434 nlmsvc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 435 void *resp) 436 { 437 struct nlm_host *host; 438 439 /* Obtain client */ 440 if (nlmsvc_retrieve_args(rqstp, argp, &host, NULL)) 441 return rpc_success; 442 443 nlmsvc_free_host_resources(host); 444 nlm_release_host(host); 445 return rpc_success; 446 } 447 448 /* 449 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 450 */ 451 static __be32 452 nlmsvc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 453 void *resp) 454 { 455 struct sockaddr_in saddr; 456 457 memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr)); 458 459 dprintk("lockd: SM_NOTIFY called\n"); 460 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 461 || ntohs(saddr.sin_port) >= 1024) { 462 char buf[RPC_MAX_ADDRBUFLEN]; 463 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 464 svc_print_addr(rqstp, buf, sizeof(buf))); 465 return rpc_system_err; 466 } 467 468 /* Obtain the host pointer for this NFS server and try to 469 * reclaim all locks we hold on this server. 470 */ 471 memset(&saddr, 0, sizeof(saddr)); 472 saddr.sin_addr.s_addr = argp->addr; 473 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); 474 475 return rpc_success; 476 } 477 478 /* 479 * client sent a GRANTED_RES, let's remove the associated block 480 */ 481 static __be32 482 nlmsvc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 483 void *resp) 484 { 485 if (!nlmsvc_ops) 486 return rpc_success; 487 488 dprintk("lockd: GRANTED_RES called\n"); 489 490 nlmsvc_grant_reply(&argp->cookie, argp->status); 491 return rpc_success; 492 } 493 494 /* 495 * NLM Server procedures. 496 */ 497 498 #define nlmsvc_encode_norep nlmsvc_encode_void 499 #define nlmsvc_decode_norep nlmsvc_decode_void 500 #define nlmsvc_decode_testres nlmsvc_decode_void 501 #define nlmsvc_decode_lockres nlmsvc_decode_void 502 #define nlmsvc_decode_unlockres nlmsvc_decode_void 503 #define nlmsvc_decode_cancelres nlmsvc_decode_void 504 #define nlmsvc_decode_grantedres nlmsvc_decode_void 505 506 #define nlmsvc_proc_none nlmsvc_proc_null 507 #define nlmsvc_proc_test_res nlmsvc_proc_null 508 #define nlmsvc_proc_lock_res nlmsvc_proc_null 509 #define nlmsvc_proc_cancel_res nlmsvc_proc_null 510 #define nlmsvc_proc_unlock_res nlmsvc_proc_null 511 512 struct nlm_void { int dummy; }; 513 514 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 515 { .pc_func = (svc_procfunc) nlmsvc_proc_##name, \ 516 .pc_decode = (kxdrproc_t) nlmsvc_decode_##xargt, \ 517 .pc_encode = (kxdrproc_t) nlmsvc_encode_##xrest, \ 518 .pc_release = NULL, \ 519 .pc_argsize = sizeof(struct nlm_##argt), \ 520 .pc_ressize = sizeof(struct nlm_##rest), \ 521 .pc_xdrressize = respsize, \ 522 } 523 524 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 525 #define St 1 /* status */ 526 #define No (1+1024/4) /* Net Obj */ 527 #define Rg 2 /* range - offset + size */ 528 529 struct svc_procedure nlmsvc_procedures[] = { 530 PROC(null, void, void, void, void, 1), 531 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 532 PROC(lock, lockargs, res, args, res, Ck+St), 533 PROC(cancel, cancargs, res, args, res, Ck+St), 534 PROC(unlock, unlockargs, res, args, res, Ck+St), 535 PROC(granted, testargs, res, args, res, Ck+St), 536 PROC(test_msg, testargs, norep, args, void, 1), 537 PROC(lock_msg, lockargs, norep, args, void, 1), 538 PROC(cancel_msg, cancargs, norep, args, void, 1), 539 PROC(unlock_msg, unlockargs, norep, args, void, 1), 540 PROC(granted_msg, testargs, norep, args, void, 1), 541 PROC(test_res, testres, norep, res, void, 1), 542 PROC(lock_res, lockres, norep, res, void, 1), 543 PROC(cancel_res, cancelres, norep, res, void, 1), 544 PROC(unlock_res, unlockres, norep, res, void, 1), 545 PROC(granted_res, res, norep, res, void, 1), 546 /* statd callback */ 547 PROC(sm_notify, reboot, void, reboot, void, 1), 548 PROC(none, void, void, void, void, 1), 549 PROC(none, void, void, void, void, 1), 550 PROC(none, void, void, void, void, 1), 551 PROC(share, shareargs, shareres, args, res, Ck+St+1), 552 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 553 PROC(nm_lock, lockargs, res, args, res, Ck+St), 554 PROC(free_all, notify, void, args, void, 0), 555 556 }; 557