1 /* 2 * linux/fs/lockd/svc4proc.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 static u32 nlm4svc_callback(struct svc_rqst *, u32, struct nlm_res *); 25 26 static const struct rpc_call_ops nlm4svc_callback_ops; 27 28 /* 29 * Obtain client and file from arguments 30 */ 31 static u32 32 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 33 struct nlm_host **hostp, struct nlm_file **filp) 34 { 35 struct nlm_host *host = NULL; 36 struct nlm_file *file = NULL; 37 struct nlm_lock *lock = &argp->lock; 38 u32 error = 0; 39 40 /* nfsd callbacks must have been installed for this procedure */ 41 if (!nlmsvc_ops) 42 return nlm_lck_denied_nolocks; 43 44 /* Obtain host handle */ 45 if (!(host = nlmsvc_lookup_host(rqstp)) 46 || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0)) 47 goto no_locks; 48 *hostp = host; 49 50 /* Obtain file pointer. Not used by FREE_ALL call. */ 51 if (filp != NULL) { 52 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 53 goto no_locks; 54 *filp = file; 55 56 /* Set up the missing parts of the file_lock structure */ 57 lock->fl.fl_file = file->f_file; 58 lock->fl.fl_owner = (fl_owner_t) host; 59 lock->fl.fl_lmops = &nlmsvc_lock_operations; 60 } 61 62 return 0; 63 64 no_locks: 65 if (host) 66 nlm_release_host(host); 67 if (error) 68 return error; 69 return nlm_lck_denied_nolocks; 70 } 71 72 /* 73 * NULL: Test for presence of service 74 */ 75 static int 76 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 77 { 78 dprintk("lockd: NULL called\n"); 79 return rpc_success; 80 } 81 82 /* 83 * TEST: Check for conflicting lock 84 */ 85 static int 86 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 87 struct nlm_res *resp) 88 { 89 struct nlm_host *host; 90 struct nlm_file *file; 91 92 dprintk("lockd: TEST4 called\n"); 93 resp->cookie = argp->cookie; 94 95 /* Don't accept test requests during grace period */ 96 if (nlmsvc_grace_period) { 97 resp->status = nlm_lck_denied_grace_period; 98 return rpc_success; 99 } 100 101 /* Obtain client and file */ 102 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 103 return rpc_success; 104 105 /* Now check for conflicting locks */ 106 resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock); 107 108 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 109 nlm_release_host(host); 110 nlm_release_file(file); 111 return rpc_success; 112 } 113 114 static int 115 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 116 struct nlm_res *resp) 117 { 118 struct nlm_host *host; 119 struct nlm_file *file; 120 121 dprintk("lockd: LOCK called\n"); 122 123 resp->cookie = argp->cookie; 124 125 /* Don't accept new lock requests during grace period */ 126 if (nlmsvc_grace_period && !argp->reclaim) { 127 resp->status = nlm_lck_denied_grace_period; 128 return rpc_success; 129 } 130 131 /* Obtain client and file */ 132 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 133 return rpc_success; 134 135 #if 0 136 /* If supplied state doesn't match current state, we assume it's 137 * an old request that time-warped somehow. Any error return would 138 * do in this case because it's irrelevant anyway. 139 * 140 * NB: We don't retrieve the remote host's state yet. 141 */ 142 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 143 resp->status = nlm_lck_denied_nolocks; 144 } else 145 #endif 146 147 /* Now try to lock the file */ 148 resp->status = nlmsvc_lock(rqstp, file, &argp->lock, 149 argp->block, &argp->cookie); 150 151 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 152 nlm_release_host(host); 153 nlm_release_file(file); 154 return rpc_success; 155 } 156 157 static int 158 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 159 struct nlm_res *resp) 160 { 161 struct nlm_host *host; 162 struct nlm_file *file; 163 164 dprintk("lockd: CANCEL called\n"); 165 166 resp->cookie = argp->cookie; 167 168 /* Don't accept requests during grace period */ 169 if (nlmsvc_grace_period) { 170 resp->status = nlm_lck_denied_grace_period; 171 return rpc_success; 172 } 173 174 /* Obtain client and file */ 175 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 176 return rpc_success; 177 178 /* Try to cancel request. */ 179 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 180 181 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 182 nlm_release_host(host); 183 nlm_release_file(file); 184 return rpc_success; 185 } 186 187 /* 188 * UNLOCK: release a lock 189 */ 190 static int 191 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 192 struct nlm_res *resp) 193 { 194 struct nlm_host *host; 195 struct nlm_file *file; 196 197 dprintk("lockd: UNLOCK called\n"); 198 199 resp->cookie = argp->cookie; 200 201 /* Don't accept new lock requests during grace period */ 202 if (nlmsvc_grace_period) { 203 resp->status = nlm_lck_denied_grace_period; 204 return rpc_success; 205 } 206 207 /* Obtain client and file */ 208 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 209 return rpc_success; 210 211 /* Now try to remove the lock */ 212 resp->status = nlmsvc_unlock(file, &argp->lock); 213 214 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 215 nlm_release_host(host); 216 nlm_release_file(file); 217 return rpc_success; 218 } 219 220 /* 221 * GRANTED: A server calls us to tell that a process' lock request 222 * was granted 223 */ 224 static int 225 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 226 struct nlm_res *resp) 227 { 228 resp->cookie = argp->cookie; 229 230 dprintk("lockd: GRANTED called\n"); 231 resp->status = nlmclnt_grant(&argp->lock); 232 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 233 return rpc_success; 234 } 235 236 /* 237 * `Async' versions of the above service routines. They aren't really, 238 * because we send the callback before the reply proper. I hope this 239 * doesn't break any clients. 240 */ 241 static int 242 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 243 void *resp) 244 { 245 struct nlm_res res; 246 u32 stat; 247 248 dprintk("lockd: TEST_MSG called\n"); 249 memset(&res, 0, sizeof(res)); 250 251 if ((stat = nlm4svc_proc_test(rqstp, argp, &res)) == 0) 252 stat = nlm4svc_callback(rqstp, NLMPROC_TEST_RES, &res); 253 return stat; 254 } 255 256 static int 257 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 258 void *resp) 259 { 260 struct nlm_res res; 261 u32 stat; 262 263 dprintk("lockd: LOCK_MSG called\n"); 264 memset(&res, 0, sizeof(res)); 265 266 if ((stat = nlm4svc_proc_lock(rqstp, argp, &res)) == 0) 267 stat = nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, &res); 268 return stat; 269 } 270 271 static int 272 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 273 void *resp) 274 { 275 struct nlm_res res; 276 u32 stat; 277 278 dprintk("lockd: CANCEL_MSG called\n"); 279 memset(&res, 0, sizeof(res)); 280 281 if ((stat = nlm4svc_proc_cancel(rqstp, argp, &res)) == 0) 282 stat = nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, &res); 283 return stat; 284 } 285 286 static int 287 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 288 void *resp) 289 { 290 struct nlm_res res; 291 u32 stat; 292 293 dprintk("lockd: UNLOCK_MSG called\n"); 294 memset(&res, 0, sizeof(res)); 295 296 if ((stat = nlm4svc_proc_unlock(rqstp, argp, &res)) == 0) 297 stat = nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, &res); 298 return stat; 299 } 300 301 static int 302 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 303 void *resp) 304 { 305 struct nlm_res res; 306 u32 stat; 307 308 dprintk("lockd: GRANTED_MSG called\n"); 309 memset(&res, 0, sizeof(res)); 310 311 if ((stat = nlm4svc_proc_granted(rqstp, argp, &res)) == 0) 312 stat = nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, &res); 313 return stat; 314 } 315 316 /* 317 * SHARE: create a DOS share or alter existing share. 318 */ 319 static int 320 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 321 struct nlm_res *resp) 322 { 323 struct nlm_host *host; 324 struct nlm_file *file; 325 326 dprintk("lockd: SHARE called\n"); 327 328 resp->cookie = argp->cookie; 329 330 /* Don't accept new lock requests during grace period */ 331 if (nlmsvc_grace_period && !argp->reclaim) { 332 resp->status = nlm_lck_denied_grace_period; 333 return rpc_success; 334 } 335 336 /* Obtain client and file */ 337 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 338 return rpc_success; 339 340 /* Now try to create the share */ 341 resp->status = nlmsvc_share_file(host, file, argp); 342 343 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 344 nlm_release_host(host); 345 nlm_release_file(file); 346 return rpc_success; 347 } 348 349 /* 350 * UNSHARE: Release a DOS share. 351 */ 352 static int 353 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 354 struct nlm_res *resp) 355 { 356 struct nlm_host *host; 357 struct nlm_file *file; 358 359 dprintk("lockd: UNSHARE called\n"); 360 361 resp->cookie = argp->cookie; 362 363 /* Don't accept requests during grace period */ 364 if (nlmsvc_grace_period) { 365 resp->status = nlm_lck_denied_grace_period; 366 return rpc_success; 367 } 368 369 /* Obtain client and file */ 370 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 371 return rpc_success; 372 373 /* Now try to lock the file */ 374 resp->status = nlmsvc_unshare_file(host, file, argp); 375 376 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 377 nlm_release_host(host); 378 nlm_release_file(file); 379 return rpc_success; 380 } 381 382 /* 383 * NM_LOCK: Create an unmonitored lock 384 */ 385 static int 386 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 387 struct nlm_res *resp) 388 { 389 dprintk("lockd: NM_LOCK called\n"); 390 391 argp->monitor = 0; /* just clean the monitor flag */ 392 return nlm4svc_proc_lock(rqstp, argp, resp); 393 } 394 395 /* 396 * FREE_ALL: Release all locks and shares held by client 397 */ 398 static int 399 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 400 void *resp) 401 { 402 struct nlm_host *host; 403 404 /* Obtain client */ 405 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 406 return rpc_success; 407 408 nlmsvc_free_host_resources(host); 409 nlm_release_host(host); 410 return rpc_success; 411 } 412 413 /* 414 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 415 */ 416 static int 417 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 418 void *resp) 419 { 420 struct sockaddr_in saddr = rqstp->rq_addr; 421 int vers = argp->vers; 422 int prot = argp->proto >> 1; 423 424 struct nlm_host *host; 425 426 dprintk("lockd: SM_NOTIFY called\n"); 427 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 428 || ntohs(saddr.sin_port) >= 1024) { 429 printk(KERN_WARNING 430 "lockd: rejected NSM callback from %08x:%d\n", 431 ntohl(rqstp->rq_addr.sin_addr.s_addr), 432 ntohs(rqstp->rq_addr.sin_port)); 433 return rpc_system_err; 434 } 435 436 /* Obtain the host pointer for this NFS server and try to 437 * reclaim all locks we hold on this server. 438 */ 439 saddr.sin_addr.s_addr = argp->addr; 440 441 if ((argp->proto & 1)==0) { 442 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) { 443 nlmclnt_recovery(host, argp->state); 444 nlm_release_host(host); 445 } 446 } else { 447 /* If we run on an NFS server, delete all locks held by the client */ 448 449 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) { 450 nlmsvc_free_host_resources(host); 451 nlm_release_host(host); 452 } 453 } 454 return rpc_success; 455 } 456 457 /* 458 * client sent a GRANTED_RES, let's remove the associated block 459 */ 460 static int 461 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 462 void *resp) 463 { 464 if (!nlmsvc_ops) 465 return rpc_success; 466 467 dprintk("lockd: GRANTED_RES called\n"); 468 469 nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status); 470 return rpc_success; 471 } 472 473 474 /* 475 * This is the generic lockd callback for async RPC calls 476 */ 477 static u32 478 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_res *resp) 479 { 480 struct nlm_host *host; 481 struct nlm_rqst *call; 482 483 if (!(call = nlmclnt_alloc_call())) 484 return rpc_system_err; 485 486 host = nlmclnt_lookup_host(&rqstp->rq_addr, 487 rqstp->rq_prot, rqstp->rq_vers); 488 if (!host) { 489 kfree(call); 490 return rpc_system_err; 491 } 492 493 call->a_flags = RPC_TASK_ASYNC; 494 call->a_host = host; 495 memcpy(&call->a_args, resp, sizeof(*resp)); 496 497 if (nlmsvc_async_call(call, proc, &nlm4svc_callback_ops) < 0) 498 goto error; 499 500 return rpc_success; 501 error: 502 kfree(call); 503 nlm_release_host(host); 504 return rpc_system_err; 505 } 506 507 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 508 { 509 struct nlm_rqst *call = data; 510 511 if (task->tk_status < 0) { 512 dprintk("lockd: %4d callback failed (errno = %d)\n", 513 task->tk_pid, -task->tk_status); 514 } 515 nlm_release_host(call->a_host); 516 kfree(call); 517 } 518 519 static const struct rpc_call_ops nlm4svc_callback_ops = { 520 .rpc_call_done = nlm4svc_callback_exit, 521 }; 522 523 /* 524 * NLM Server procedures. 525 */ 526 527 #define nlm4svc_encode_norep nlm4svc_encode_void 528 #define nlm4svc_decode_norep nlm4svc_decode_void 529 #define nlm4svc_decode_testres nlm4svc_decode_void 530 #define nlm4svc_decode_lockres nlm4svc_decode_void 531 #define nlm4svc_decode_unlockres nlm4svc_decode_void 532 #define nlm4svc_decode_cancelres nlm4svc_decode_void 533 #define nlm4svc_decode_grantedres nlm4svc_decode_void 534 535 #define nlm4svc_proc_none nlm4svc_proc_null 536 #define nlm4svc_proc_test_res nlm4svc_proc_null 537 #define nlm4svc_proc_lock_res nlm4svc_proc_null 538 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 539 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 540 541 struct nlm_void { int dummy; }; 542 543 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 544 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 545 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 546 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 547 .pc_release = NULL, \ 548 .pc_argsize = sizeof(struct nlm_##argt), \ 549 .pc_ressize = sizeof(struct nlm_##rest), \ 550 .pc_xdrressize = respsize, \ 551 } 552 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 553 #define No (1+1024/4) /* netobj */ 554 #define St 1 /* status */ 555 #define Rg 4 /* range (offset + length) */ 556 struct svc_procedure nlmsvc_procedures4[] = { 557 PROC(null, void, void, void, void, 1), 558 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 559 PROC(lock, lockargs, res, args, res, Ck+St), 560 PROC(cancel, cancargs, res, args, res, Ck+St), 561 PROC(unlock, unlockargs, res, args, res, Ck+St), 562 PROC(granted, testargs, res, args, res, Ck+St), 563 PROC(test_msg, testargs, norep, args, void, 1), 564 PROC(lock_msg, lockargs, norep, args, void, 1), 565 PROC(cancel_msg, cancargs, norep, args, void, 1), 566 PROC(unlock_msg, unlockargs, norep, args, void, 1), 567 PROC(granted_msg, testargs, norep, args, void, 1), 568 PROC(test_res, testres, norep, res, void, 1), 569 PROC(lock_res, lockres, norep, res, void, 1), 570 PROC(cancel_res, cancelres, norep, res, void, 1), 571 PROC(unlock_res, unlockres, norep, res, void, 1), 572 PROC(granted_res, res, norep, res, void, 1), 573 /* statd callback */ 574 PROC(sm_notify, reboot, void, reboot, void, 1), 575 PROC(none, void, void, void, void, 0), 576 PROC(none, void, void, void, void, 0), 577 PROC(none, void, void, void, void, 0), 578 PROC(share, shareargs, shareres, args, res, Ck+St+1), 579 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 580 PROC(nm_lock, lockargs, res, args, res, Ck+St), 581 PROC(free_all, notify, void, args, void, 1), 582 583 }; 584