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sys/nlm/nlm_prot_impl.c
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1 /*- 2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/ 3 * Authors: Doug Rabson <dfr@rabson.org> 4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include "opt_inet6.h" 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/fcntl.h> 35 #include <sys/kernel.h> 36 #include <sys/kthread.h> 37 #include <sys/lockf.h> 38 #include <sys/malloc.h> 39 #include <sys/mount.h> 40 #if __FreeBSD_version >= 700000 41 #include <sys/priv.h> 42 #endif 43 #include <sys/proc.h> 44 #include <sys/socket.h> 45 #include <sys/socketvar.h> 46 #include <sys/syscall.h> 47 #include <sys/sysctl.h> 48 #include <sys/sysent.h> 49 #include <sys/sysproto.h> 50 #include <sys/systm.h> 51 #include <sys/taskqueue.h> 52 #include <sys/unistd.h> 53 #include <sys/vnode.h> 54 55 #include <nfs/nfsproto.h> 56 #include <nfsclient/nfs.h> 57 #include <nfsclient/nfsnode.h> 58 59 #include <nlm/nlm_prot.h> 60 #include <nlm/sm_inter.h> 61 #include <nlm/nlm.h> 62 #include <rpc/rpc_com.h> 63 #include <rpc/rpcb_prot.h> 64 65 MALLOC_DEFINE(M_NLM, "NLM", "Network Lock Manager"); 66 67 /* 68 * If a host is inactive (and holds no locks) for this amount of 69 * seconds, we consider it idle and stop tracking it. 70 */ 71 #define NLM_IDLE_TIMEOUT 30 72 73 /* 74 * We check the host list for idle every few seconds. 75 */ 76 #define NLM_IDLE_PERIOD 5 77 78 /* 79 * Support for sysctl vfs.nlm.sysid 80 */ 81 SYSCTL_NODE(_vfs, OID_AUTO, nlm, CTLFLAG_RW, NULL, "Network Lock Manager"); 82 SYSCTL_NODE(_vfs_nlm, OID_AUTO, sysid, CTLFLAG_RW, NULL, ""); 83 84 /* 85 * Syscall hooks 86 */ 87 static int nlm_syscall_offset = SYS_nlm_syscall; 88 static struct sysent nlm_syscall_prev_sysent; 89 #if __FreeBSD_version < 700000 90 static struct sysent nlm_syscall_sysent = { 91 (sizeof(struct nlm_syscall_args) / sizeof(register_t)) | SYF_MPSAFE, 92 (sy_call_t *) nlm_syscall 93 }; 94 #else 95 MAKE_SYSENT(nlm_syscall); 96 #endif 97 static bool_t nlm_syscall_registered = FALSE; 98 99 /* 100 * Debug level passed in from userland. We also support a sysctl hook 101 * so that it can be changed on a live system. 102 */ 103 static int nlm_debug_level; 104 SYSCTL_INT(_debug, OID_AUTO, nlm_debug, CTLFLAG_RW, &nlm_debug_level, 0, ""); 105 106 /* 107 * Grace period handling. The value of nlm_grace_threshold is the 108 * value of time_uptime after which we are serving requests normally. 109 */ 110 static time_t nlm_grace_threshold; 111 112 /* 113 * We check for idle hosts if time_uptime is greater than 114 * nlm_next_idle_check, 115 */ 116 static time_t nlm_next_idle_check; 117 118 /* 119 * A socket to use for RPC - shared by all IPv4 RPC clients. 120 */ 121 static struct socket *nlm_socket; 122 123 #ifdef INET6 124 125 /* 126 * A socket to use for RPC - shared by all IPv6 RPC clients. 127 */ 128 static struct socket *nlm_socket6; 129 130 #endif 131 132 /* 133 * An RPC client handle that can be used to communicate with the local 134 * NSM. 135 */ 136 static CLIENT *nlm_nsm; 137 138 /* 139 * An AUTH handle for the server's creds. 140 */ 141 static AUTH *nlm_auth; 142 143 /* 144 * A zero timeval for sending async RPC messages. 145 */ 146 struct timeval nlm_zero_tv = { 0, 0 }; 147 148 /* 149 * The local NSM state number 150 */ 151 int nlm_nsm_state; 152 153 154 /* 155 * A lock to protect the host list and waiting lock list. 156 */ 157 static struct mtx nlm_global_lock; 158 159 /* 160 * Locks: 161 * (l) locked by nh_lock 162 * (s) only accessed via server RPC which is single threaded 163 * (g) locked by nlm_global_lock 164 * (c) const until freeing 165 * (a) modified using atomic ops 166 */ 167 168 /* 169 * A pending client-side lock request, stored on the nlm_waiting_locks 170 * list. 171 */ 172 struct nlm_waiting_lock { 173 TAILQ_ENTRY(nlm_waiting_lock) nw_link; /* (g) */ 174 bool_t nw_waiting; /* (g) */ 175 nlm4_lock nw_lock; /* (c) */ 176 union nfsfh nw_fh; /* (c) */ 177 struct vnode *nw_vp; /* (c) */ 178 }; 179 TAILQ_HEAD(nlm_waiting_lock_list, nlm_waiting_lock); 180 181 struct nlm_waiting_lock_list nlm_waiting_locks; /* (g) */ 182 183 /* 184 * A pending server-side asynchronous lock request, stored on the 185 * nh_pending list of the NLM host. 186 */ 187 struct nlm_async_lock { 188 TAILQ_ENTRY(nlm_async_lock) af_link; /* (l) host's list of locks */ 189 struct task af_task; /* (c) async callback details */ 190 void *af_cookie; /* (l) lock manager cancel token */ 191 struct vnode *af_vp; /* (l) vnode to lock */ 192 struct flock af_fl; /* (c) lock details */ 193 struct nlm_host *af_host; /* (c) host which is locking */ 194 CLIENT *af_rpc; /* (c) rpc client to send message */ 195 nlm4_testargs af_granted; /* (c) notification details */ 196 }; 197 TAILQ_HEAD(nlm_async_lock_list, nlm_async_lock); 198 199 /* 200 * NLM host. 201 */ 202 enum nlm_host_state { 203 NLM_UNMONITORED, 204 NLM_MONITORED, 205 NLM_MONITOR_FAILED, 206 NLM_RECOVERING 207 }; 208 struct nlm_host { 209 struct mtx nh_lock; 210 volatile u_int nh_refs; /* (a) reference count */ 211 TAILQ_ENTRY(nlm_host) nh_link; /* (g) global list of hosts */ 212 char nh_caller_name[MAXNAMELEN]; /* (c) printable name of host */ 213 uint32_t nh_sysid; /* (c) our allocaed system ID */ 214 char nh_sysid_string[10]; /* (c) string rep. of sysid */ 215 struct sockaddr_storage nh_addr; /* (s) remote address of host */ 216 CLIENT *nh_rpc; /* (l) RPC handle to send to host */ 217 rpcvers_t nh_vers; /* (s) NLM version of host */ 218 int nh_state; /* (s) last seen NSM state of host */ 219 enum nlm_host_state nh_monstate; /* (l) local NSM monitoring state */ 220 time_t nh_idle_timeout; /* (s) Time at which host is idle */ 221 time_t nh_rpc_create_time; /* (s) Time we create RPC client */ 222 struct sysctl_ctx_list nh_sysctl; /* (c) vfs.nlm.sysid nodes */ 223 struct nlm_async_lock_list nh_pending; /* (l) pending async locks */ 224 struct nlm_async_lock_list nh_finished; /* (l) finished async locks */ 225 }; 226 TAILQ_HEAD(nlm_host_list, nlm_host); 227 228 static struct nlm_host_list nlm_hosts; /* (g) */ 229 static uint32_t nlm_next_sysid = 1; /* (g) */ 230 231 static void nlm_host_unmonitor(struct nlm_host *); 232 233 /**********************************************************************/ 234 235 /* 236 * Initialise NLM globals. 237 */ 238 static void 239 nlm_init(void *dummy) 240 { 241 int error; 242 243 mtx_init(&nlm_global_lock, "nlm_global_lock", NULL, MTX_DEF); 244 TAILQ_INIT(&nlm_waiting_locks); 245 TAILQ_INIT(&nlm_hosts); 246 247 error = syscall_register(&nlm_syscall_offset, &nlm_syscall_sysent, 248 &nlm_syscall_prev_sysent); 249 if (error) 250 printf("Can't register NLM syscall\n"); 251 else 252 nlm_syscall_registered = TRUE; 253 } 254 SYSINIT(nlm_init, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_init, NULL); 255 256 static void 257 nlm_uninit(void *dummy) 258 { 259 260 if (nlm_syscall_registered) 261 syscall_deregister(&nlm_syscall_offset, 262 &nlm_syscall_prev_sysent); 263 } 264 SYSUNINIT(nlm_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_uninit, NULL); 265 266 /* 267 * Copy a struct netobj. 268 */ 269 void 270 nlm_copy_netobj(struct netobj *dst, struct netobj *src, 271 struct malloc_type *type) 272 { 273 274 dst->n_len = src->n_len; 275 dst->n_bytes = malloc(src->n_len, type, M_WAITOK); 276 memcpy(dst->n_bytes, src->n_bytes, src->n_len); 277 } 278 279 /* 280 * Create an RPC client handle for the given (address,prog,vers) 281 * triple using UDP. 282 */ 283 static CLIENT * 284 nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers) 285 { 286 const char *wchan = "nlmrcv"; 287 const char* protofmly; 288 struct sockaddr_storage ss; 289 struct socket *so; 290 CLIENT *rpcb; 291 struct timeval timo; 292 RPCB parms; 293 char *uaddr; 294 enum clnt_stat stat = RPC_SUCCESS; 295 int rpcvers = RPCBVERS4; 296 bool_t do_tcp = FALSE; 297 struct pmap mapping; 298 u_short port = 0; 299 300 /* 301 * First we need to contact the remote RPCBIND service to find 302 * the right port. 303 */ 304 memcpy(&ss, sa, sa->sa_len); 305 switch (ss.ss_family) { 306 case AF_INET: 307 ((struct sockaddr_in *)&ss)->sin_port = htons(111); 308 protofmly = "inet"; 309 so = nlm_socket; 310 break; 311 312 #ifdef INET6 313 case AF_INET6: 314 ((struct sockaddr_in6 *)&ss)->sin6_port = htons(111); 315 protofmly = "inet6"; 316 so = nlm_socket6; 317 break; 318 #endif 319 320 default: 321 /* 322 * Unsupported address family - fail. 323 */ 324 return (NULL); 325 } 326 327 rpcb = clnt_dg_create(so, (struct sockaddr *)&ss, 328 RPCBPROG, rpcvers, 0, 0); 329 if (!rpcb) 330 return (NULL); 331 332 try_tcp: 333 parms.r_prog = prog; 334 parms.r_vers = vers; 335 if (do_tcp) 336 parms.r_netid = "tcp"; 337 else 338 parms.r_netid = "udp"; 339 parms.r_addr = ""; 340 parms.r_owner = ""; 341 342 /* 343 * Use the default timeout. 344 */ 345 timo.tv_sec = 25; 346 timo.tv_usec = 0; 347 again: 348 switch (rpcvers) { 349 case RPCBVERS4: 350 case RPCBVERS: 351 /* 352 * Try RPCBIND 4 then 3. 353 */ 354 uaddr = NULL; 355 stat = CLNT_CALL(rpcb, (rpcprog_t) RPCBPROC_GETADDR, 356 (xdrproc_t) xdr_rpcb, &parms, 357 (xdrproc_t) xdr_wrapstring, &uaddr, timo); 358 if (stat == RPC_PROGVERSMISMATCH) { 359 if (rpcvers == RPCBVERS4) 360 rpcvers = RPCBVERS; 361 else if (rpcvers == RPCBVERS) 362 rpcvers = PMAPVERS; 363 CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers); 364 goto again; 365 } else if (stat == RPC_SUCCESS) { 366 /* 367 * We have a reply from the remote RPCBIND - turn it 368 * into an appropriate address and make a new client 369 * that can talk to the remote NLM. 370 * 371 * XXX fixup IPv6 scope ID. 372 */ 373 struct netbuf *a; 374 a = __rpc_uaddr2taddr_af(ss.ss_family, uaddr); 375 if (!a) { 376 CLNT_DESTROY(rpcb); 377 return (NULL); 378 } 379 memcpy(&ss, a->buf, a->len); 380 free(a->buf, M_RPC); 381 free(a, M_RPC); 382 xdr_free((xdrproc_t) xdr_wrapstring, &uaddr); 383 } 384 break; 385 case PMAPVERS: 386 /* 387 * Try portmap. 388 */ 389 mapping.pm_prog = parms.r_prog; 390 mapping.pm_vers = parms.r_vers; 391 mapping.pm_prot = do_tcp ? IPPROTO_TCP : IPPROTO_UDP; 392 mapping.pm_port = 0; 393 394 stat = CLNT_CALL(rpcb, (rpcprog_t) PMAPPROC_GETPORT, 395 (xdrproc_t) xdr_pmap, &mapping, 396 (xdrproc_t) xdr_u_short, &port, timo); 397 398 if (stat == RPC_SUCCESS) { 399 switch (ss.ss_family) { 400 case AF_INET: 401 ((struct sockaddr_in *)&ss)->sin_port = 402 htons(port); 403 break; 404 405 #ifdef INET6 406 case AF_INET6: 407 ((struct sockaddr_in6 *)&ss)->sin6_port = 408 htons(port); 409 break; 410 #endif 411 } 412 } 413 break; 414 default: 415 panic("invalid rpcvers %d", rpcvers); 416 } 417 /* 418 * We may have a positive response from the portmapper, but the NLM 419 * service was not found. Make sure we received a valid port. 420 */ 421 switch (ss.ss_family) { 422 case AF_INET: 423 port = ((struct sockaddr_in *)&ss)->sin_port; 424 break; 425 #ifdef INET6 426 case AF_INET6: 427 port = ((struct sockaddr_in6 *)&ss)->sin6_port; 428 break; 429 #endif 430 } 431 if (stat != RPC_SUCCESS || !port) { 432 /* 433 * If we were able to talk to rpcbind or portmap, but the udp 434 * variant wasn't available, ask about tcp. 435 * 436 * XXX - We could also check for a TCP portmapper, but 437 * if the host is running a portmapper at all, we should be able 438 * to hail it over UDP. 439 */ 440 if (stat == RPC_SUCCESS && !do_tcp) { 441 do_tcp = TRUE; 442 goto try_tcp; 443 } 444 445 /* Otherwise, bad news. */ 446 printf("NLM: failed to contact remote rpcbind, " 447 "stat = %d, port = %d\n", 448 (int) stat, port); 449 CLNT_DESTROY(rpcb); 450 return (NULL); 451 } 452 453 if (do_tcp) { 454 /* 455 * Destroy the UDP client we used to speak to rpcbind and 456 * recreate as a TCP client. 457 */ 458 struct netconfig *nconf = NULL; 459 460 CLNT_DESTROY(rpcb); 461 462 switch (ss.ss_family) { 463 case AF_INET: 464 nconf = getnetconfigent("tcp"); 465 break; 466 #ifdef INET6 467 case AF_INET6: 468 nconf = getnetconfigent("tcp6"); 469 break; 470 #endif 471 } 472 473 rpcb = clnt_reconnect_create(nconf, (struct sockaddr *)&ss, 474 prog, vers, 0, 0); 475 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, &wchan); 476 rpcb->cl_auth = nlm_auth; 477 478 } else { 479 /* 480 * Re-use the client we used to speak to rpcbind. 481 */ 482 CLNT_CONTROL(rpcb, CLSET_SVC_ADDR, &ss); 483 CLNT_CONTROL(rpcb, CLSET_PROG, &prog); 484 CLNT_CONTROL(rpcb, CLSET_VERS, &vers); 485 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, &wchan); 486 rpcb->cl_auth = nlm_auth; 487 } 488 489 return (rpcb); 490 } 491 492 /* 493 * This async callback after when an async lock request has been 494 * granted. We notify the host which initiated the request. 495 */ 496 static void 497 nlm_lock_callback(void *arg, int pending) 498 { 499 struct nlm_async_lock *af = (struct nlm_async_lock *) arg; 500 struct rpc_callextra ext; 501 502 if (nlm_debug_level >= 2) 503 printf("NLM: async lock %p for %s (sysid %d) granted\n", 504 af, af->af_host->nh_caller_name, 505 af->af_host->nh_sysid); 506 507 /* 508 * Send the results back to the host. 509 * 510 * Note: there is a possible race here with nlm_host_notify 511 * destroying the RPC client. To avoid problems, the first 512 * thing nlm_host_notify does is to cancel pending async lock 513 * requests. 514 */ 515 memset(&ext, 0, sizeof(ext)); 516 ext.rc_auth = nlm_auth; 517 if (af->af_host->nh_vers == NLM_VERS4) { 518 nlm4_granted_msg_4(&af->af_granted, 519 NULL, af->af_rpc, &ext, nlm_zero_tv); 520 } else { 521 /* 522 * Back-convert to legacy protocol 523 */ 524 nlm_testargs granted; 525 granted.cookie = af->af_granted.cookie; 526 granted.exclusive = af->af_granted.exclusive; 527 granted.alock.caller_name = 528 af->af_granted.alock.caller_name; 529 granted.alock.fh = af->af_granted.alock.fh; 530 granted.alock.oh = af->af_granted.alock.oh; 531 granted.alock.svid = af->af_granted.alock.svid; 532 granted.alock.l_offset = 533 af->af_granted.alock.l_offset; 534 granted.alock.l_len = 535 af->af_granted.alock.l_len; 536 537 nlm_granted_msg_1(&granted, 538 NULL, af->af_rpc, &ext, nlm_zero_tv); 539 } 540 541 /* 542 * Move this entry to the nh_finished list. Someone else will 543 * free it later - its too hard to do it here safely without 544 * racing with cancel. 545 * 546 * XXX possibly we should have a third "granted sent but not 547 * ack'ed" list so that we can re-send the granted message. 548 */ 549 mtx_lock(&af->af_host->nh_lock); 550 TAILQ_REMOVE(&af->af_host->nh_pending, af, af_link); 551 TAILQ_INSERT_TAIL(&af->af_host->nh_finished, af, af_link); 552 mtx_unlock(&af->af_host->nh_lock); 553 } 554 555 /* 556 * Free an async lock request. The request must have been removed from 557 * any list. 558 */ 559 static void 560 nlm_free_async_lock(struct nlm_async_lock *af) 561 { 562 /* 563 * Free an async lock. 564 */ 565 if (af->af_rpc) 566 CLNT_RELEASE(af->af_rpc); 567 xdr_free((xdrproc_t) xdr_nlm4_testargs, &af->af_granted); 568 if (af->af_vp) 569 vrele(af->af_vp); 570 free(af, M_NLM); 571 } 572 573 /* 574 * Cancel our async request - this must be called with 575 * af->nh_host->nh_lock held. This is slightly complicated by a 576 * potential race with our own callback. If we fail to cancel the 577 * lock, it must already have been granted - we make sure our async 578 * task has completed by calling taskqueue_drain in this case. 579 */ 580 static int 581 nlm_cancel_async_lock(struct nlm_async_lock *af) 582 { 583 struct nlm_host *host = af->af_host; 584 int error; 585 586 mtx_assert(&host->nh_lock, MA_OWNED); 587 588 mtx_unlock(&host->nh_lock); 589 590 error = VOP_ADVLOCKASYNC(af->af_vp, NULL, F_CANCEL, &af->af_fl, 591 F_REMOTE, NULL, &af->af_cookie); 592 593 if (error) { 594 /* 595 * We failed to cancel - make sure our callback has 596 * completed before we continue. 597 */ 598 taskqueue_drain(taskqueue_thread, &af->af_task); 599 } 600 601 mtx_lock(&host->nh_lock); 602 603 if (!error) { 604 if (nlm_debug_level >= 2) 605 printf("NLM: async lock %p for %s (sysid %d) " 606 "cancelled\n", 607 af, host->nh_caller_name, host->nh_sysid); 608 609 /* 610 * Remove from the nh_pending list and free now that 611 * we are safe from the callback. 612 */ 613 TAILQ_REMOVE(&host->nh_pending, af, af_link); 614 mtx_unlock(&host->nh_lock); 615 nlm_free_async_lock(af); 616 mtx_lock(&host->nh_lock); 617 } 618 619 return (error); 620 } 621 622 static void 623 nlm_free_finished_locks(struct nlm_host *host) 624 { 625 struct nlm_async_lock *af; 626 627 mtx_lock(&host->nh_lock); 628 while ((af = TAILQ_FIRST(&host->nh_finished)) != NULL) { 629 TAILQ_REMOVE(&host->nh_finished, af, af_link); 630 mtx_unlock(&host->nh_lock); 631 nlm_free_async_lock(af); 632 mtx_lock(&host->nh_lock); 633 } 634 mtx_unlock(&host->nh_lock); 635 } 636 637 /* 638 * Free resources used by a host. This is called after the reference 639 * count has reached zero so it doesn't need to worry about locks. 640 */ 641 static void 642 nlm_host_destroy(struct nlm_host *host) 643 { 644 645 mtx_lock(&nlm_global_lock); 646 TAILQ_REMOVE(&nlm_hosts, host, nh_link); 647 mtx_unlock(&nlm_global_lock); 648 649 if (host->nh_rpc) 650 CLNT_RELEASE(host->nh_rpc); 651 mtx_destroy(&host->nh_lock); 652 sysctl_ctx_free(&host->nh_sysctl); 653 free(host, M_NLM); 654 } 655 656 /* 657 * Thread start callback for client lock recovery 658 */ 659 static void 660 nlm_client_recovery_start(void *arg) 661 { 662 struct nlm_host *host = (struct nlm_host *) arg; 663 664 if (nlm_debug_level >= 1) 665 printf("NLM: client lock recovery for %s started\n", 666 host->nh_caller_name); 667 668 nlm_client_recovery(host); 669 670 if (nlm_debug_level >= 1) 671 printf("NLM: client lock recovery for %s completed\n", 672 host->nh_caller_name); 673 674 host->nh_monstate = NLM_MONITORED; 675 nlm_host_release(host); 676 677 kthread_exit(0); 678 } 679 680 /* 681 * This is called when we receive a host state change notification. We 682 * unlock any active locks owned by the host. When rpc.lockd is 683 * shutting down, this function is called with newstate set to zero 684 * which allows us to cancel any pending async locks and clear the 685 * locking state. 686 */ 687 static void 688 nlm_host_notify(struct nlm_host *host, int newstate) 689 { 690 struct nlm_async_lock *af; 691 692 if (newstate) { 693 if (nlm_debug_level >= 1) 694 printf("NLM: host %s (sysid %d) rebooted, new " 695 "state is %d\n", 696 host->nh_caller_name, host->nh_sysid, newstate); 697 } 698 699 /* 700 * Cancel any pending async locks for this host. 701 */ 702 mtx_lock(&host->nh_lock); 703 while ((af = TAILQ_FIRST(&host->nh_pending)) != NULL) { 704 /* 705 * nlm_cancel_async_lock will remove the entry from 706 * nh_pending and free it. 707 */ 708 nlm_cancel_async_lock(af); 709 } 710 mtx_unlock(&host->nh_lock); 711 nlm_free_finished_locks(host); 712 713 /* 714 * The host just rebooted - trash its locks. 715 */ 716 lf_clearremotesys(host->nh_sysid); 717 host->nh_state = newstate; 718 719 /* 720 * If we have any remote locks for this host (i.e. it 721 * represents a remote NFS server that our local NFS client 722 * has locks for), start a recovery thread. 723 */ 724 if (newstate != 0 725 && host->nh_monstate != NLM_RECOVERING 726 && lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid) > 0) { 727 host->nh_monstate = NLM_RECOVERING; 728 refcount_acquire(&host->nh_refs); 729 kthread_create(nlm_client_recovery_start, host, NULL, 0, 0, 730 "NFS lock recovery for %s", host->nh_caller_name); 731 } 732 } 733 734 /* 735 * Sysctl handler to count the number of locks for a sysid. 736 */ 737 static int 738 nlm_host_lock_count_sysctl(SYSCTL_HANDLER_ARGS) 739 { 740 struct nlm_host *host; 741 int count; 742 743 host = oidp->oid_arg1; 744 count = lf_countlocks(host->nh_sysid); 745 return sysctl_handle_int(oidp, &count, 0, req); 746 } 747 748 /* 749 * Sysctl handler to count the number of client locks for a sysid. 750 */ 751 static int 752 nlm_host_client_lock_count_sysctl(SYSCTL_HANDLER_ARGS) 753 { 754 struct nlm_host *host; 755 int count; 756 757 host = oidp->oid_arg1; 758 count = lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid); 759 return sysctl_handle_int(oidp, &count, 0, req); 760 } 761 762 /* 763 * Create a new NLM host. 764 */ 765 static struct nlm_host * 766 nlm_create_host(const char* caller_name) 767 { 768 struct nlm_host *host; 769 struct sysctl_oid *oid; 770 771 mtx_assert(&nlm_global_lock, MA_OWNED); 772 773 if (nlm_debug_level >= 1) 774 printf("NLM: new host %s (sysid %d)\n", 775 caller_name, nlm_next_sysid); 776 host = malloc(sizeof(struct nlm_host), M_NLM, M_NOWAIT|M_ZERO); 777 if (!host) 778 return (NULL); 779 mtx_init(&host->nh_lock, "nh_lock", NULL, MTX_DEF); 780 host->nh_refs = 1; 781 strlcpy(host->nh_caller_name, caller_name, MAXNAMELEN); 782 host->nh_sysid = nlm_next_sysid++; 783 snprintf(host->nh_sysid_string, sizeof(host->nh_sysid_string), 784 "%d", host->nh_sysid); 785 host->nh_rpc = NULL; 786 host->nh_vers = 0; 787 host->nh_state = 0; 788 host->nh_monstate = NLM_UNMONITORED; 789 TAILQ_INIT(&host->nh_pending); 790 TAILQ_INIT(&host->nh_finished); 791 TAILQ_INSERT_TAIL(&nlm_hosts, host, nh_link); 792 793 mtx_unlock(&nlm_global_lock); 794 795 sysctl_ctx_init(&host->nh_sysctl); 796 oid = SYSCTL_ADD_NODE(&host->nh_sysctl, 797 SYSCTL_STATIC_CHILDREN(_vfs_nlm_sysid), 798 OID_AUTO, host->nh_sysid_string, CTLFLAG_RD, NULL, ""); 799 SYSCTL_ADD_STRING(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 800 "hostname", CTLFLAG_RD, host->nh_caller_name, 0, ""); 801 SYSCTL_ADD_INT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 802 "version", CTLFLAG_RD, &host->nh_vers, 0, ""); 803 SYSCTL_ADD_INT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 804 "monitored", CTLFLAG_RD, &host->nh_monstate, 0, ""); 805 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 806 "lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0, 807 nlm_host_lock_count_sysctl, "I", ""); 808 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 809 "client_lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0, 810 nlm_host_client_lock_count_sysctl, "I", ""); 811 812 mtx_lock(&nlm_global_lock); 813 814 return (host); 815 } 816 817 /* 818 * Return non-zero if the address parts of the two sockaddrs are the 819 * same. 820 */ 821 static int 822 nlm_compare_addr(const struct sockaddr *a, const struct sockaddr *b) 823 { 824 const struct sockaddr_in *a4, *b4; 825 #ifdef INET6 826 const struct sockaddr_in6 *a6, *b6; 827 #endif 828 829 if (a->sa_family != b->sa_family) 830 return (FALSE); 831 832 switch (a->sa_family) { 833 case AF_INET: 834 a4 = (const struct sockaddr_in *) a; 835 b4 = (const struct sockaddr_in *) b; 836 return !memcmp(&a4->sin_addr, &b4->sin_addr, 837 sizeof(a4->sin_addr)); 838 #ifdef INET6 839 case AF_INET6: 840 a6 = (const struct sockaddr_in6 *) a; 841 b6 = (const struct sockaddr_in6 *) b; 842 return !memcmp(&a6->sin6_addr, &b6->sin6_addr, 843 sizeof(a6->sin6_addr)); 844 #endif 845 } 846 847 return (0); 848 } 849 850 /* 851 * Check for idle hosts and stop monitoring them. We could also free 852 * the host structure here, possibly after a larger timeout but that 853 * would require some care to avoid races with 854 * e.g. nlm_host_lock_count_sysctl. 855 */ 856 static void 857 nlm_check_idle(void) 858 { 859 struct nlm_host *host; 860 861 mtx_assert(&nlm_global_lock, MA_OWNED); 862 863 if (time_uptime <= nlm_next_idle_check) 864 return; 865 866 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD; 867 868 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 869 if (host->nh_monstate == NLM_MONITORED 870 && time_uptime > host->nh_idle_timeout) { 871 mtx_unlock(&nlm_global_lock); 872 if (lf_countlocks(host->nh_sysid) > 0 873 || lf_countlocks(NLM_SYSID_CLIENT 874 + host->nh_sysid)) { 875 host->nh_idle_timeout = 876 time_uptime + NLM_IDLE_TIMEOUT; 877 mtx_lock(&nlm_global_lock); 878 continue; 879 } 880 nlm_host_unmonitor(host); 881 mtx_lock(&nlm_global_lock); 882 } 883 } 884 } 885 886 /* 887 * Search for an existing NLM host that matches the given name 888 * (typically the caller_name element of an nlm4_lock). If none is 889 * found, create a new host. If 'addr' is non-NULL, record the remote 890 * address of the host so that we can call it back for async 891 * responses. If 'vers' is greater than zero then record the NLM 892 * program version to use to communicate with this client. 893 */ 894 struct nlm_host * 895 nlm_find_host_by_name(const char *name, const struct sockaddr *addr, 896 rpcvers_t vers) 897 { 898 struct nlm_host *host; 899 900 mtx_lock(&nlm_global_lock); 901 902 /* 903 * The remote host is determined by caller_name. 904 */ 905 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 906 if (!strcmp(host->nh_caller_name, name)) 907 break; 908 } 909 910 if (!host) { 911 host = nlm_create_host(name); 912 if (!host) { 913 mtx_unlock(&nlm_global_lock); 914 return (NULL); 915 } 916 } 917 refcount_acquire(&host->nh_refs); 918 919 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT; 920 921 /* 922 * If we have an address for the host, record it so that we 923 * can send async replies etc. 924 */ 925 if (addr) { 926 927 KASSERT(addr->sa_len < sizeof(struct sockaddr_storage), 928 ("Strange remote transport address length")); 929 930 /* 931 * If we have seen an address before and we currently 932 * have an RPC client handle, make sure the address is 933 * the same, otherwise discard the client handle. 934 */ 935 if (host->nh_addr.ss_len && host->nh_rpc) { 936 if (!nlm_compare_addr( 937 (struct sockaddr *) &host->nh_addr, 938 addr) 939 || host->nh_vers != vers) { 940 CLIENT *client; 941 mtx_lock(&host->nh_lock); 942 client = host->nh_rpc; 943 host->nh_rpc = NULL; 944 mtx_unlock(&host->nh_lock); 945 if (client) { 946 CLNT_RELEASE(client); 947 } 948 } 949 } 950 memcpy(&host->nh_addr, addr, addr->sa_len); 951 host->nh_vers = vers; 952 } 953 954 nlm_check_idle(); 955 956 mtx_unlock(&nlm_global_lock); 957 958 return (host); 959 } 960 961 /* 962 * Search for an existing NLM host that matches the given remote 963 * address. If none is found, create a new host with the requested 964 * address and remember 'vers' as the NLM protocol version to use for 965 * that host. 966 */ 967 struct nlm_host * 968 nlm_find_host_by_addr(const struct sockaddr *addr, int vers) 969 { 970 /* 971 * Fake up a name using inet_ntop. This buffer is 972 * large enough for an IPv6 address. 973 */ 974 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"]; 975 struct nlm_host *host; 976 977 switch (addr->sa_family) { 978 case AF_INET: 979 __rpc_inet_ntop(AF_INET, 980 &((const struct sockaddr_in *) addr)->sin_addr, 981 tmp, sizeof tmp); 982 break; 983 #ifdef INET6 984 case AF_INET6: 985 __rpc_inet_ntop(AF_INET6, 986 &((const struct sockaddr_in6 *) addr)->sin6_addr, 987 tmp, sizeof tmp); 988 break; 989 #endif 990 default: 991 strcmp(tmp, "<unknown>"); 992 } 993 994 995 mtx_lock(&nlm_global_lock); 996 997 /* 998 * The remote host is determined by caller_name. 999 */ 1000 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 1001 if (nlm_compare_addr(addr, 1002 (const struct sockaddr *) &host->nh_addr)) 1003 break; 1004 } 1005 1006 if (!host) { 1007 host = nlm_create_host(tmp); 1008 if (!host) { 1009 mtx_unlock(&nlm_global_lock); 1010 return (NULL); 1011 } 1012 memcpy(&host->nh_addr, addr, addr->sa_len); 1013 host->nh_vers = vers; 1014 } 1015 refcount_acquire(&host->nh_refs); 1016 1017 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT; 1018 1019 nlm_check_idle(); 1020 1021 mtx_unlock(&nlm_global_lock); 1022 1023 return (host); 1024 } 1025 1026 /* 1027 * Find the NLM host that matches the value of 'sysid'. If none 1028 * exists, return NULL. 1029 */ 1030 static struct nlm_host * 1031 nlm_find_host_by_sysid(int sysid) 1032 { 1033 struct nlm_host *host; 1034 1035 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 1036 if (host->nh_sysid == sysid) { 1037 refcount_acquire(&host->nh_refs); 1038 return (host); 1039 } 1040 } 1041 1042 return (NULL); 1043 } 1044 1045 void nlm_host_release(struct nlm_host *host) 1046 { 1047 if (refcount_release(&host->nh_refs)) { 1048 /* 1049 * Free the host 1050 */ 1051 nlm_host_destroy(host); 1052 } 1053 } 1054 1055 /* 1056 * Unregister this NLM host with the local NSM due to idleness. 1057 */ 1058 static void 1059 nlm_host_unmonitor(struct nlm_host *host) 1060 { 1061 mon_id smmonid; 1062 sm_stat_res smstat; 1063 struct timeval timo; 1064 enum clnt_stat stat; 1065 1066 if (nlm_debug_level >= 1) 1067 printf("NLM: unmonitoring %s (sysid %d)\n", 1068 host->nh_caller_name, host->nh_sysid); 1069 1070 /* 1071 * We put our assigned system ID value in the priv field to 1072 * make it simpler to find the host if we are notified of a 1073 * host restart. 1074 */ 1075 smmonid.mon_name = host->nh_caller_name; 1076 smmonid.my_id.my_name = "localhost"; 1077 smmonid.my_id.my_prog = NLM_PROG; 1078 smmonid.my_id.my_vers = NLM_SM; 1079 smmonid.my_id.my_proc = NLM_SM_NOTIFY; 1080 1081 timo.tv_sec = 25; 1082 timo.tv_usec = 0; 1083 stat = CLNT_CALL(nlm_nsm, SM_UNMON, 1084 (xdrproc_t) xdr_mon, &smmonid, 1085 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1086 1087 if (stat != RPC_SUCCESS) { 1088 printf("Failed to contact local NSM - rpc error %d\n", stat); 1089 return; 1090 } 1091 if (smstat.res_stat == stat_fail) { 1092 printf("Local NSM refuses to unmonitor %s\n", 1093 host->nh_caller_name); 1094 return; 1095 } 1096 1097 host->nh_monstate = NLM_UNMONITORED; 1098 } 1099 1100 /* 1101 * Register this NLM host with the local NSM so that we can be 1102 * notified if it reboots. 1103 */ 1104 void 1105 nlm_host_monitor(struct nlm_host *host, int state) 1106 { 1107 mon smmon; 1108 sm_stat_res smstat; 1109 struct timeval timo; 1110 enum clnt_stat stat; 1111 1112 if (state && !host->nh_state) { 1113 /* 1114 * This is the first time we have seen an NSM state 1115 * value for this host. We record it here to help 1116 * detect host reboots. 1117 */ 1118 host->nh_state = state; 1119 if (nlm_debug_level >= 1) 1120 printf("NLM: host %s (sysid %d) has NSM state %d\n", 1121 host->nh_caller_name, host->nh_sysid, state); 1122 } 1123 1124 mtx_lock(&host->nh_lock); 1125 if (host->nh_monstate != NLM_UNMONITORED) { 1126 mtx_unlock(&host->nh_lock); 1127 return; 1128 } 1129 host->nh_monstate = NLM_MONITORED; 1130 mtx_unlock(&host->nh_lock); 1131 1132 if (nlm_debug_level >= 1) 1133 printf("NLM: monitoring %s (sysid %d)\n", 1134 host->nh_caller_name, host->nh_sysid); 1135 1136 /* 1137 * We put our assigned system ID value in the priv field to 1138 * make it simpler to find the host if we are notified of a 1139 * host restart. 1140 */ 1141 smmon.mon_id.mon_name = host->nh_caller_name; 1142 smmon.mon_id.my_id.my_name = "localhost"; 1143 smmon.mon_id.my_id.my_prog = NLM_PROG; 1144 smmon.mon_id.my_id.my_vers = NLM_SM; 1145 smmon.mon_id.my_id.my_proc = NLM_SM_NOTIFY; 1146 memcpy(smmon.priv, &host->nh_sysid, sizeof(host->nh_sysid)); 1147 1148 timo.tv_sec = 25; 1149 timo.tv_usec = 0; 1150 stat = CLNT_CALL(nlm_nsm, SM_MON, 1151 (xdrproc_t) xdr_mon, &smmon, 1152 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1153 1154 if (stat != RPC_SUCCESS) { 1155 printf("Failed to contact local NSM - rpc error %d\n", stat); 1156 return; 1157 } 1158 if (smstat.res_stat == stat_fail) { 1159 printf("Local NSM refuses to monitor %s\n", 1160 host->nh_caller_name); 1161 mtx_lock(&host->nh_lock); 1162 host->nh_monstate = NLM_MONITOR_FAILED; 1163 mtx_unlock(&host->nh_lock); 1164 return; 1165 } 1166 1167 host->nh_monstate = NLM_MONITORED; 1168 } 1169 1170 /* 1171 * Return an RPC client handle that can be used to talk to the NLM 1172 * running on the given host. 1173 */ 1174 CLIENT * 1175 nlm_host_get_rpc(struct nlm_host *host) 1176 { 1177 CLIENT *client; 1178 1179 mtx_lock(&host->nh_lock); 1180 1181 /* 1182 * We can't hold onto RPC handles for too long - the async 1183 * call/reply protocol used by some NLM clients makes it hard 1184 * to tell when they change port numbers (e.g. after a 1185 * reboot). Note that if a client reboots while it isn't 1186 * holding any locks, it won't bother to notify us. We 1187 * expire the RPC handles after two minutes. 1188 */ 1189 if (host->nh_rpc && time_uptime > host->nh_rpc_create_time + 2*60) { 1190 client = host->nh_rpc; 1191 host->nh_rpc = NULL; 1192 mtx_unlock(&host->nh_lock); 1193 CLNT_RELEASE(client); 1194 mtx_lock(&host->nh_lock); 1195 } 1196 1197 if (!host->nh_rpc) { 1198 mtx_unlock(&host->nh_lock); 1199 client = nlm_get_rpc((struct sockaddr *)&host->nh_addr, 1200 NLM_PROG, host->nh_vers); 1201 mtx_lock(&host->nh_lock); 1202 1203 if (client) { 1204 if (host->nh_rpc) { 1205 mtx_unlock(&host->nh_lock); 1206 CLNT_DESTROY(client); 1207 mtx_lock(&host->nh_lock); 1208 } else { 1209 host->nh_rpc = client; 1210 host->nh_rpc_create_time = time_uptime; 1211 } 1212 } 1213 } 1214 1215 client = host->nh_rpc; 1216 if (client) 1217 CLNT_ACQUIRE(client); 1218 mtx_unlock(&host->nh_lock); 1219 1220 return (client); 1221 1222 } 1223 1224 int nlm_host_get_sysid(struct nlm_host *host) 1225 { 1226 1227 return (host->nh_sysid); 1228 } 1229 1230 int 1231 nlm_host_get_state(struct nlm_host *host) 1232 { 1233 1234 return (host->nh_state); 1235 } 1236 1237 void * 1238 nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp) 1239 { 1240 struct nlm_waiting_lock *nw; 1241 1242 nw = malloc(sizeof(struct nlm_waiting_lock), M_NLM, M_WAITOK); 1243 nw->nw_lock = *lock; 1244 memcpy(&nw->nw_fh.fh_bytes, nw->nw_lock.fh.n_bytes, 1245 nw->nw_lock.fh.n_len); 1246 nw->nw_lock.fh.n_bytes = nw->nw_fh.fh_bytes; 1247 nw->nw_waiting = TRUE; 1248 nw->nw_vp = vp; 1249 mtx_lock(&nlm_global_lock); 1250 TAILQ_INSERT_TAIL(&nlm_waiting_locks, nw, nw_link); 1251 mtx_unlock(&nlm_global_lock); 1252 1253 return nw; 1254 } 1255 1256 void 1257 nlm_deregister_wait_lock(void *handle) 1258 { 1259 struct nlm_waiting_lock *nw = handle; 1260 1261 mtx_lock(&nlm_global_lock); 1262 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link); 1263 mtx_unlock(&nlm_global_lock); 1264 1265 free(nw, M_NLM); 1266 } 1267 1268 int 1269 nlm_wait_lock(void *handle, int timo) 1270 { 1271 struct nlm_waiting_lock *nw = handle; 1272 int error; 1273 1274 /* 1275 * If the granted message arrived before we got here, 1276 * nw->nw_waiting will be FALSE - in that case, don't sleep. 1277 */ 1278 mtx_lock(&nlm_global_lock); 1279 error = 0; 1280 if (nw->nw_waiting) 1281 error = msleep(nw, &nlm_global_lock, PCATCH, "nlmlock", timo); 1282 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link); 1283 if (error) { 1284 /* 1285 * The granted message may arrive after the 1286 * interrupt/timeout but before we manage to lock the 1287 * mutex. Detect this by examining nw_lock. 1288 */ 1289 if (!nw->nw_waiting) 1290 error = 0; 1291 } else { 1292 /* 1293 * If nlm_cancel_wait is called, then error will be 1294 * zero but nw_waiting will still be TRUE. We 1295 * translate this into EINTR. 1296 */ 1297 if (nw->nw_waiting) 1298 error = EINTR; 1299 } 1300 mtx_unlock(&nlm_global_lock); 1301 1302 free(nw, M_NLM); 1303 1304 return (error); 1305 } 1306 1307 void 1308 nlm_cancel_wait(struct vnode *vp) 1309 { 1310 struct nlm_waiting_lock *nw; 1311 1312 mtx_lock(&nlm_global_lock); 1313 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 1314 if (nw->nw_vp == vp) { 1315 wakeup(nw); 1316 } 1317 } 1318 mtx_unlock(&nlm_global_lock); 1319 } 1320 1321 1322 /**********************************************************************/ 1323 1324 /* 1325 * Syscall interface with userland. 1326 */ 1327 1328 extern void nlm_prog_0(struct svc_req *rqstp, SVCXPRT *transp); 1329 extern void nlm_prog_1(struct svc_req *rqstp, SVCXPRT *transp); 1330 extern void nlm_prog_3(struct svc_req *rqstp, SVCXPRT *transp); 1331 extern void nlm_prog_4(struct svc_req *rqstp, SVCXPRT *transp); 1332 1333 static int 1334 nlm_register_services(SVCPOOL *pool, int addr_count, char **addrs) 1335 { 1336 static rpcvers_t versions[] = { 1337 NLM_SM, NLM_VERS, NLM_VERSX, NLM_VERS4 1338 }; 1339 static void (*dispatchers[])(struct svc_req *, SVCXPRT *) = { 1340 nlm_prog_0, nlm_prog_1, nlm_prog_3, nlm_prog_4 1341 }; 1342 static const int version_count = sizeof(versions) / sizeof(versions[0]); 1343 1344 SVCXPRT **xprts; 1345 char netid[16]; 1346 char uaddr[128]; 1347 struct netconfig *nconf; 1348 int i, j, error; 1349 1350 if (!addr_count) { 1351 printf("NLM: no service addresses given - can't start server"); 1352 return (EINVAL); 1353 } 1354 1355 xprts = malloc(addr_count * sizeof(SVCXPRT *), M_NLM, M_WAITOK); 1356 for (i = 0; i < version_count; i++) { 1357 for (j = 0; j < addr_count; j++) { 1358 /* 1359 * Create transports for the first version and 1360 * then just register everything else to the 1361 * same transports. 1362 */ 1363 if (i == 0) { 1364 char *up; 1365 1366 error = copyin(&addrs[2*j], &up, 1367 sizeof(char*)); 1368 if (error) 1369 goto out; 1370 error = copyinstr(up, netid, sizeof(netid), 1371 NULL); 1372 if (error) 1373 goto out; 1374 error = copyin(&addrs[2*j+1], &up, 1375 sizeof(char*)); 1376 if (error) 1377 goto out; 1378 error = copyinstr(up, uaddr, sizeof(uaddr), 1379 NULL); 1380 if (error) 1381 goto out; 1382 nconf = getnetconfigent(netid); 1383 if (!nconf) { 1384 printf("Can't lookup netid %s\n", 1385 netid); 1386 error = EINVAL; 1387 goto out; 1388 } 1389 xprts[j] = svc_tp_create(pool, dispatchers[i], 1390 NLM_PROG, versions[i], uaddr, nconf); 1391 if (!xprts[j]) { 1392 printf("NLM: unable to create " 1393 "(NLM_PROG, %d).\n", versions[i]); 1394 error = EINVAL; 1395 goto out; 1396 } 1397 freenetconfigent(nconf); 1398 } else { 1399 nconf = getnetconfigent(xprts[j]->xp_netid); 1400 rpcb_unset(NLM_PROG, versions[i], nconf); 1401 if (!svc_reg(xprts[j], NLM_PROG, versions[i], 1402 dispatchers[i], nconf)) { 1403 printf("NLM: can't register " 1404 "(NLM_PROG, %d)\n", versions[i]); 1405 error = EINVAL; 1406 goto out; 1407 } 1408 } 1409 } 1410 } 1411 error = 0; 1412 out: 1413 free(xprts, M_NLM); 1414 return (error); 1415 } 1416 1417 /* 1418 * Main server entry point. Contacts the local NSM to get its current 1419 * state and send SM_UNMON_ALL. Registers the NLM services and then 1420 * services requests. Does not return until the server is interrupted 1421 * by a signal. 1422 */ 1423 static int 1424 nlm_server_main(int addr_count, char **addrs) 1425 { 1426 struct thread *td = curthread; 1427 int error; 1428 SVCPOOL *pool = NULL; 1429 struct sockopt opt; 1430 int portlow; 1431 #ifdef INET6 1432 struct sockaddr_in6 sin6; 1433 #endif 1434 struct sockaddr_in sin; 1435 my_id id; 1436 sm_stat smstat; 1437 struct timeval timo; 1438 enum clnt_stat stat; 1439 struct nlm_host *host, *nhost; 1440 struct nlm_waiting_lock *nw; 1441 vop_advlock_t *old_nfs_advlock; 1442 vop_reclaim_t *old_nfs_reclaim; 1443 int v4_used; 1444 #ifdef INET6 1445 int v6_used; 1446 #endif 1447 1448 if (nlm_socket) { 1449 printf("NLM: can't start server - it appears to be running already\n"); 1450 return (EPERM); 1451 } 1452 1453 memset(&opt, 0, sizeof(opt)); 1454 1455 nlm_socket = NULL; 1456 error = socreate(AF_INET, &nlm_socket, SOCK_DGRAM, 0, 1457 td->td_ucred, td); 1458 if (error) { 1459 printf("NLM: can't create IPv4 socket - error %d\n", error); 1460 return (error); 1461 } 1462 opt.sopt_dir = SOPT_SET; 1463 opt.sopt_level = IPPROTO_IP; 1464 opt.sopt_name = IP_PORTRANGE; 1465 portlow = IP_PORTRANGE_LOW; 1466 opt.sopt_val = &portlow; 1467 opt.sopt_valsize = sizeof(portlow); 1468 sosetopt(nlm_socket, &opt); 1469 1470 #ifdef INET6 1471 nlm_socket6 = NULL; 1472 error = socreate(AF_INET6, &nlm_socket6, SOCK_DGRAM, 0, 1473 td->td_ucred, td); 1474 if (error) { 1475 printf("NLM: can't create IPv6 socket - error %d\n", error); 1476 goto out; 1477 return (error); 1478 } 1479 opt.sopt_dir = SOPT_SET; 1480 opt.sopt_level = IPPROTO_IPV6; 1481 opt.sopt_name = IPV6_PORTRANGE; 1482 portlow = IPV6_PORTRANGE_LOW; 1483 opt.sopt_val = &portlow; 1484 opt.sopt_valsize = sizeof(portlow); 1485 sosetopt(nlm_socket6, &opt); 1486 #endif 1487 1488 nlm_auth = authunix_create(curthread->td_ucred); 1489 1490 #ifdef INET6 1491 memset(&sin6, 0, sizeof(sin6)); 1492 sin6.sin6_len = sizeof(sin6); 1493 sin6.sin6_family = AF_INET6; 1494 sin6.sin6_addr = in6addr_loopback; 1495 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin6, SM_PROG, SM_VERS); 1496 if (!nlm_nsm) { 1497 #endif 1498 memset(&sin, 0, sizeof(sin)); 1499 sin.sin_len = sizeof(sin); 1500 sin.sin_family = AF_INET; 1501 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 1502 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin, SM_PROG, 1503 SM_VERS); 1504 #ifdef INET6 1505 } 1506 #endif 1507 1508 if (!nlm_nsm) { 1509 printf("Can't start NLM - unable to contact NSM\n"); 1510 error = EINVAL; 1511 goto out; 1512 } 1513 1514 pool = svcpool_create(); 1515 1516 error = nlm_register_services(pool, addr_count, addrs); 1517 if (error) 1518 goto out; 1519 1520 memset(&id, 0, sizeof(id)); 1521 id.my_name = "NFS NLM"; 1522 1523 timo.tv_sec = 25; 1524 timo.tv_usec = 0; 1525 stat = CLNT_CALL(nlm_nsm, SM_UNMON_ALL, 1526 (xdrproc_t) xdr_my_id, &id, 1527 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1528 1529 if (stat != RPC_SUCCESS) { 1530 struct rpc_err err; 1531 1532 CLNT_GETERR(nlm_nsm, &err); 1533 printf("NLM: unexpected error contacting NSM, stat=%d, errno=%d\n", 1534 stat, err.re_errno); 1535 error = EINVAL; 1536 goto out; 1537 } 1538 1539 if (nlm_debug_level >= 1) 1540 printf("NLM: local NSM state is %d\n", smstat.state); 1541 nlm_nsm_state = smstat.state; 1542 1543 old_nfs_advlock = nfs_advlock_p; 1544 nfs_advlock_p = nlm_advlock; 1545 old_nfs_reclaim = nfs_reclaim_p; 1546 nfs_reclaim_p = nlm_reclaim; 1547 1548 svc_run(pool); 1549 error = 0; 1550 1551 nfs_advlock_p = old_nfs_advlock; 1552 nfs_reclaim_p = old_nfs_reclaim; 1553 1554 out: 1555 if (pool) 1556 svcpool_destroy(pool); 1557 1558 /* 1559 * We are finished communicating with the NSM. 1560 */ 1561 if (nlm_nsm) { 1562 CLNT_RELEASE(nlm_nsm); 1563 nlm_nsm = NULL; 1564 } 1565 1566 /* 1567 * Trash all the existing state so that if the server 1568 * restarts, it gets a clean slate. This is complicated by the 1569 * possibility that there may be other threads trying to make 1570 * client locking requests. 1571 * 1572 * First we fake a client reboot notification which will 1573 * cancel any pending async locks and purge remote lock state 1574 * from the local lock manager. We release the reference from 1575 * nlm_hosts to the host (which may remove it from the list 1576 * and free it). After this phase, the only entries in the 1577 * nlm_host list should be from other threads performing 1578 * client lock requests. We arrange to defer closing the 1579 * sockets until the last RPC client handle is released. 1580 */ 1581 v4_used = 0; 1582 #ifdef INET6 1583 v6_used = 0; 1584 #endif 1585 mtx_lock(&nlm_global_lock); 1586 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 1587 wakeup(nw); 1588 } 1589 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) { 1590 mtx_unlock(&nlm_global_lock); 1591 nlm_host_notify(host, 0); 1592 nlm_host_release(host); 1593 mtx_lock(&nlm_global_lock); 1594 } 1595 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) { 1596 mtx_lock(&host->nh_lock); 1597 if (host->nh_rpc) { 1598 if (host->nh_addr.ss_family == AF_INET) 1599 v4_used++; 1600 #ifdef INET6 1601 if (host->nh_addr.ss_family == AF_INET6) 1602 v6_used++; 1603 #endif 1604 /* 1605 * Note that the rpc over udp code copes 1606 * correctly with the fact that a socket may 1607 * be used by many rpc handles. 1608 */ 1609 CLNT_CONTROL(host->nh_rpc, CLSET_FD_CLOSE, 0); 1610 } 1611 mtx_unlock(&host->nh_lock); 1612 } 1613 mtx_unlock(&nlm_global_lock); 1614 1615 AUTH_DESTROY(nlm_auth); 1616 1617 if (!v4_used) 1618 soclose(nlm_socket); 1619 nlm_socket = NULL; 1620 #ifdef INET6 1621 if (!v6_used) 1622 soclose(nlm_socket6); 1623 nlm_socket6 = NULL; 1624 #endif 1625 1626 return (error); 1627 } 1628 1629 int 1630 nlm_syscall(struct thread *td, struct nlm_syscall_args *uap) 1631 { 1632 int error; 1633 1634 #if __FreeBSD_version >= 700000 1635 error = priv_check(td, PRIV_NFS_LOCKD); 1636 #else 1637 error = suser(td); 1638 #endif 1639 if (error) 1640 return (error); 1641 1642 nlm_debug_level = uap->debug_level; 1643 nlm_grace_threshold = time_uptime + uap->grace_period; 1644 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD; 1645 1646 return nlm_server_main(uap->addr_count, uap->addrs); 1647 } 1648 1649 /**********************************************************************/ 1650 1651 /* 1652 * NLM implementation details, called from the RPC stubs. 1653 */ 1654 1655 1656 void 1657 nlm_sm_notify(struct nlm_sm_status *argp) 1658 { 1659 uint32_t sysid; 1660 struct nlm_host *host; 1661 1662 if (nlm_debug_level >= 3) 1663 printf("nlm_sm_notify(): mon_name = %s\n", argp->mon_name); 1664 memcpy(&sysid, &argp->priv, sizeof(sysid)); 1665 host = nlm_find_host_by_sysid(sysid); 1666 if (host) { 1667 nlm_host_notify(host, argp->state); 1668 nlm_host_release(host); 1669 } 1670 } 1671 1672 static void 1673 nlm_convert_to_fhandle_t(fhandle_t *fhp, struct netobj *p) 1674 { 1675 memcpy(fhp, p->n_bytes, sizeof(fhandle_t)); 1676 } 1677 1678 struct vfs_state { 1679 struct mount *vs_mp; 1680 struct vnode *vs_vp; 1681 int vs_vfslocked; 1682 int vs_vnlocked; 1683 }; 1684 1685 static int 1686 nlm_get_vfs_state(struct nlm_host *host, struct svc_req *rqstp, 1687 fhandle_t *fhp, struct vfs_state *vs) 1688 { 1689 int error, exflags, freecred; 1690 struct ucred *cred = NULL, *credanon; 1691 1692 memset(vs, 0, sizeof(*vs)); 1693 freecred = FALSE; 1694 1695 vs->vs_mp = vfs_getvfs(&fhp->fh_fsid); 1696 if (!vs->vs_mp) { 1697 return (ESTALE); 1698 } 1699 vs->vs_vfslocked = VFS_LOCK_GIANT(vs->vs_mp); 1700 1701 error = VFS_CHECKEXP(vs->vs_mp, (struct sockaddr *)&host->nh_addr, 1702 &exflags, &credanon); 1703 if (error) 1704 goto out; 1705 1706 if (exflags & MNT_EXRDONLY || (vs->vs_mp->mnt_flag & MNT_RDONLY)) { 1707 error = EROFS; 1708 goto out; 1709 } 1710 1711 error = VFS_FHTOVP(vs->vs_mp, &fhp->fh_fid, &vs->vs_vp); 1712 if (error) 1713 goto out; 1714 vs->vs_vnlocked = TRUE; 1715 1716 cred = crget(); 1717 freecred = TRUE; 1718 if (!svc_getcred(rqstp, cred, NULL)) { 1719 error = EINVAL; 1720 goto out; 1721 } 1722 if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) { 1723 crfree(cred); 1724 cred = credanon; 1725 freecred = FALSE; 1726 } 1727 1728 /* 1729 * Check cred. 1730 */ 1731 error = VOP_ACCESS(vs->vs_vp, VWRITE, cred, curthread); 1732 if (error) 1733 goto out; 1734 1735 #if __FreeBSD_version < 800011 1736 VOP_UNLOCK(vs->vs_vp, 0, curthread); 1737 #else 1738 VOP_UNLOCK(vs->vs_vp, 0); 1739 #endif 1740 vs->vs_vnlocked = FALSE; 1741 1742 out: 1743 if (freecred) 1744 crfree(cred); 1745 1746 return (error); 1747 } 1748 1749 static void 1750 nlm_release_vfs_state(struct vfs_state *vs) 1751 { 1752 1753 if (vs->vs_vp) { 1754 if (vs->vs_vnlocked) 1755 vput(vs->vs_vp); 1756 else 1757 vrele(vs->vs_vp); 1758 } 1759 if (vs->vs_mp) 1760 vfs_rel(vs->vs_mp); 1761 VFS_UNLOCK_GIANT(vs->vs_vfslocked); 1762 } 1763 1764 static nlm4_stats 1765 nlm_convert_error(int error) 1766 { 1767 1768 if (error == ESTALE) 1769 return nlm4_stale_fh; 1770 else if (error == EROFS) 1771 return nlm4_rofs; 1772 else 1773 return nlm4_failed; 1774 } 1775 1776 int 1777 nlm_do_test(nlm4_testargs *argp, nlm4_testres *result, struct svc_req *rqstp, 1778 CLIENT **rpcp) 1779 { 1780 fhandle_t fh; 1781 struct vfs_state vs; 1782 struct nlm_host *host, *bhost; 1783 int error, sysid; 1784 struct flock fl; 1785 1786 memset(result, 0, sizeof(*result)); 1787 memset(&vs, 0, sizeof(vs)); 1788 1789 host = nlm_find_host_by_name(argp->alock.caller_name, 1790 (struct sockaddr *) rqstp->rq_xprt->xp_rtaddr.buf, rqstp->rq_vers); 1791 if (!host) { 1792 result->stat.stat = nlm4_denied_nolocks; 1793 return (ENOMEM); 1794 } 1795 1796 if (nlm_debug_level >= 3) 1797 printf("nlm_do_test(): caller_name = %s (sysid = %d)\n", 1798 host->nh_caller_name, host->nh_sysid); 1799 1800 nlm_free_finished_locks(host); 1801 sysid = host->nh_sysid; 1802 1803 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 1804 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 1805 1806 if (time_uptime < nlm_grace_threshold) { 1807 result->stat.stat = nlm4_denied_grace_period; 1808 goto out; 1809 } 1810 1811 error = nlm_get_vfs_state(host, rqstp, &fh, &vs); 1812 if (error) { 1813 result->stat.stat = nlm_convert_error(error); 1814 goto out; 1815 } 1816 1817 fl.l_start = argp->alock.l_offset; 1818 fl.l_len = argp->alock.l_len; 1819 fl.l_pid = argp->alock.svid; 1820 fl.l_sysid = sysid; 1821 fl.l_whence = SEEK_SET; 1822 if (argp->exclusive) 1823 fl.l_type = F_WRLCK; 1824 else 1825 fl.l_type = F_RDLCK; 1826 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_GETLK, &fl, F_REMOTE); 1827 if (error) { 1828 result->stat.stat = nlm4_failed; 1829 goto out; 1830 } 1831 1832 if (fl.l_type == F_UNLCK) { 1833 result->stat.stat = nlm4_granted; 1834 } else { 1835 result->stat.stat = nlm4_denied; 1836 result->stat.nlm4_testrply_u.holder.exclusive = 1837 (fl.l_type == F_WRLCK); 1838 result->stat.nlm4_testrply_u.holder.svid = fl.l_pid; 1839 bhost = nlm_find_host_by_sysid(fl.l_sysid); 1840 if (bhost) { 1841 /* 1842 * We don't have any useful way of recording 1843 * the value of oh used in the original lock 1844 * request. Ideally, the test reply would have 1845 * a space for the owning host's name allowing 1846 * our caller's NLM to keep track. 1847 * 1848 * As far as I can see, Solaris uses an eight 1849 * byte structure for oh which contains a four 1850 * byte pid encoded in local byte order and 1851 * the first four bytes of the host 1852 * name. Linux uses a variable length string 1853 * 'pid@hostname' in ascii but doesn't even 1854 * return that in test replies. 1855 * 1856 * For the moment, return nothing in oh 1857 * (already zero'ed above). 1858 */ 1859 nlm_host_release(bhost); 1860 } 1861 result->stat.nlm4_testrply_u.holder.l_offset = fl.l_start; 1862 result->stat.nlm4_testrply_u.holder.l_len = fl.l_len; 1863 } 1864 1865 out: 1866 nlm_release_vfs_state(&vs); 1867 if (rpcp) 1868 *rpcp = nlm_host_get_rpc(host); 1869 nlm_host_release(host); 1870 return (0); 1871 } 1872 1873 int 1874 nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp, 1875 bool_t monitor, CLIENT **rpcp) 1876 { 1877 fhandle_t fh; 1878 struct vfs_state vs; 1879 struct nlm_host *host; 1880 int error, sysid; 1881 struct flock fl; 1882 1883 memset(result, 0, sizeof(*result)); 1884 memset(&vs, 0, sizeof(vs)); 1885 1886 host = nlm_find_host_by_name(argp->alock.caller_name, 1887 (struct sockaddr *) rqstp->rq_xprt->xp_rtaddr.buf, rqstp->rq_vers); 1888 if (!host) { 1889 result->stat.stat = nlm4_denied_nolocks; 1890 return (ENOMEM); 1891 } 1892 1893 if (nlm_debug_level >= 3) 1894 printf("nlm_do_lock(): caller_name = %s (sysid = %d)\n", 1895 host->nh_caller_name, host->nh_sysid); 1896 1897 if (monitor && host->nh_state && argp->state 1898 && host->nh_state != argp->state) { 1899 /* 1900 * The host rebooted without telling us. Trash its 1901 * locks. 1902 */ 1903 nlm_host_notify(host, argp->state); 1904 } 1905 1906 nlm_free_finished_locks(host); 1907 sysid = host->nh_sysid; 1908 1909 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 1910 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 1911 1912 if (time_uptime < nlm_grace_threshold && !argp->reclaim) { 1913 result->stat.stat = nlm4_denied_grace_period; 1914 goto out; 1915 } 1916 1917 error = nlm_get_vfs_state(host, rqstp, &fh, &vs); 1918 if (error) { 1919 result->stat.stat = nlm_convert_error(error); 1920 goto out; 1921 } 1922 1923 fl.l_start = argp->alock.l_offset; 1924 fl.l_len = argp->alock.l_len; 1925 fl.l_pid = argp->alock.svid; 1926 fl.l_sysid = sysid; 1927 fl.l_whence = SEEK_SET; 1928 if (argp->exclusive) 1929 fl.l_type = F_WRLCK; 1930 else 1931 fl.l_type = F_RDLCK; 1932 if (argp->block) { 1933 struct nlm_async_lock *af; 1934 CLIENT *client; 1935 1936 /* 1937 * First, make sure we can contact the host's NLM. 1938 */ 1939 client = nlm_host_get_rpc(host); 1940 if (!client) { 1941 result->stat.stat = nlm4_failed; 1942 goto out; 1943 } 1944 1945 /* 1946 * First we need to check and see if there is an 1947 * existing blocked lock that matches. This could be a 1948 * badly behaved client or an RPC re-send. If we find 1949 * one, just return nlm4_blocked. 1950 */ 1951 mtx_lock(&host->nh_lock); 1952 TAILQ_FOREACH(af, &host->nh_pending, af_link) { 1953 if (af->af_fl.l_start == fl.l_start 1954 && af->af_fl.l_len == fl.l_len 1955 && af->af_fl.l_pid == fl.l_pid 1956 && af->af_fl.l_type == fl.l_type) { 1957 break; 1958 } 1959 } 1960 mtx_unlock(&host->nh_lock); 1961 if (af) { 1962 CLNT_RELEASE(client); 1963 result->stat.stat = nlm4_blocked; 1964 goto out; 1965 } 1966 1967 af = malloc(sizeof(struct nlm_async_lock), M_NLM, 1968 M_WAITOK|M_ZERO); 1969 TASK_INIT(&af->af_task, 0, nlm_lock_callback, af); 1970 af->af_vp = vs.vs_vp; 1971 af->af_fl = fl; 1972 af->af_host = host; 1973 af->af_rpc = client; 1974 /* 1975 * We use M_RPC here so that we can xdr_free the thing 1976 * later. 1977 */ 1978 af->af_granted.exclusive = argp->exclusive; 1979 af->af_granted.alock.caller_name = 1980 strdup(argp->alock.caller_name, M_RPC); 1981 nlm_copy_netobj(&af->af_granted.alock.fh, 1982 &argp->alock.fh, M_RPC); 1983 nlm_copy_netobj(&af->af_granted.alock.oh, 1984 &argp->alock.oh, M_RPC); 1985 af->af_granted.alock.svid = argp->alock.svid; 1986 af->af_granted.alock.l_offset = argp->alock.l_offset; 1987 af->af_granted.alock.l_len = argp->alock.l_len; 1988 1989 /* 1990 * Put the entry on the pending list before calling 1991 * VOP_ADVLOCKASYNC. We do this in case the lock 1992 * request was blocked (returning EINPROGRESS) but 1993 * then granted before we manage to run again. The 1994 * client may receive the granted message before we 1995 * send our blocked reply but thats their problem. 1996 */ 1997 mtx_lock(&host->nh_lock); 1998 TAILQ_INSERT_TAIL(&host->nh_pending, af, af_link); 1999 mtx_unlock(&host->nh_lock); 2000 2001 error = VOP_ADVLOCKASYNC(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE, 2002 &af->af_task, &af->af_cookie); 2003 2004 /* 2005 * If the lock completed synchronously, just free the 2006 * tracking structure now. 2007 */ 2008 if (error != EINPROGRESS) { 2009 CLNT_RELEASE(af->af_rpc); 2010 mtx_lock(&host->nh_lock); 2011 TAILQ_REMOVE(&host->nh_pending, af, af_link); 2012 mtx_unlock(&host->nh_lock); 2013 xdr_free((xdrproc_t) xdr_nlm4_testargs, 2014 &af->af_granted); 2015 free(af, M_NLM); 2016 } else { 2017 if (nlm_debug_level >= 2) 2018 printf("NLM: pending async lock %p for %s " 2019 "(sysid %d)\n", 2020 af, host->nh_caller_name, sysid); 2021 /* 2022 * Don't vrele the vnode just yet - this must 2023 * wait until either the async callback 2024 * happens or the lock is cancelled. 2025 */ 2026 vs.vs_vp = NULL; 2027 } 2028 } else { 2029 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE); 2030 } 2031 2032 if (error) { 2033 if (error == EINPROGRESS) { 2034 result->stat.stat = nlm4_blocked; 2035 } else if (error == EDEADLK) { 2036 result->stat.stat = nlm4_deadlck; 2037 } else if (error == EAGAIN) { 2038 result->stat.stat = nlm4_denied; 2039 } else { 2040 result->stat.stat = nlm4_failed; 2041 } 2042 } else { 2043 if (monitor) 2044 nlm_host_monitor(host, argp->state); 2045 result->stat.stat = nlm4_granted; 2046 } 2047 2048 out: 2049 nlm_release_vfs_state(&vs); 2050 if (rpcp) 2051 *rpcp = nlm_host_get_rpc(host); 2052 nlm_host_release(host); 2053 return (0); 2054 } 2055 2056 int 2057 nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result, struct svc_req *rqstp, 2058 CLIENT **rpcp) 2059 { 2060 fhandle_t fh; 2061 struct vfs_state vs; 2062 struct nlm_host *host; 2063 int error, sysid; 2064 struct flock fl; 2065 struct nlm_async_lock *af; 2066 2067 memset(result, 0, sizeof(*result)); 2068 memset(&vs, 0, sizeof(vs)); 2069 2070 host = nlm_find_host_by_name(argp->alock.caller_name, 2071 (struct sockaddr *) rqstp->rq_xprt->xp_rtaddr.buf, rqstp->rq_vers); 2072 if (!host) { 2073 result->stat.stat = nlm4_denied_nolocks; 2074 return (ENOMEM); 2075 } 2076 2077 if (nlm_debug_level >= 3) 2078 printf("nlm_do_cancel(): caller_name = %s (sysid = %d)\n", 2079 host->nh_caller_name, host->nh_sysid); 2080 2081 nlm_free_finished_locks(host); 2082 sysid = host->nh_sysid; 2083 2084 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 2085 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2086 2087 if (time_uptime < nlm_grace_threshold) { 2088 result->stat.stat = nlm4_denied_grace_period; 2089 goto out; 2090 } 2091 2092 error = nlm_get_vfs_state(host, rqstp, &fh, &vs); 2093 if (error) { 2094 result->stat.stat = nlm_convert_error(error); 2095 goto out; 2096 } 2097 2098 fl.l_start = argp->alock.l_offset; 2099 fl.l_len = argp->alock.l_len; 2100 fl.l_pid = argp->alock.svid; 2101 fl.l_sysid = sysid; 2102 fl.l_whence = SEEK_SET; 2103 if (argp->exclusive) 2104 fl.l_type = F_WRLCK; 2105 else 2106 fl.l_type = F_RDLCK; 2107 2108 /* 2109 * First we need to try and find the async lock request - if 2110 * there isn't one, we give up and return nlm4_denied. 2111 */ 2112 mtx_lock(&host->nh_lock); 2113 2114 TAILQ_FOREACH(af, &host->nh_pending, af_link) { 2115 if (af->af_fl.l_start == fl.l_start 2116 && af->af_fl.l_len == fl.l_len 2117 && af->af_fl.l_pid == fl.l_pid 2118 && af->af_fl.l_type == fl.l_type) { 2119 break; 2120 } 2121 } 2122 2123 if (!af) { 2124 mtx_unlock(&host->nh_lock); 2125 result->stat.stat = nlm4_denied; 2126 goto out; 2127 } 2128 2129 error = nlm_cancel_async_lock(af); 2130 2131 if (error) { 2132 result->stat.stat = nlm4_denied; 2133 } else { 2134 result->stat.stat = nlm4_granted; 2135 } 2136 2137 mtx_unlock(&host->nh_lock); 2138 2139 out: 2140 nlm_release_vfs_state(&vs); 2141 if (rpcp) 2142 *rpcp = nlm_host_get_rpc(host); 2143 nlm_host_release(host); 2144 return (0); 2145 } 2146 2147 int 2148 nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result, struct svc_req *rqstp, 2149 CLIENT **rpcp) 2150 { 2151 fhandle_t fh; 2152 struct vfs_state vs; 2153 struct nlm_host *host; 2154 int error, sysid; 2155 struct flock fl; 2156 2157 memset(result, 0, sizeof(*result)); 2158 memset(&vs, 0, sizeof(vs)); 2159 2160 host = nlm_find_host_by_name(argp->alock.caller_name, 2161 (struct sockaddr *) rqstp->rq_xprt->xp_rtaddr.buf, rqstp->rq_vers); 2162 if (!host) { 2163 result->stat.stat = nlm4_denied_nolocks; 2164 return (ENOMEM); 2165 } 2166 2167 if (nlm_debug_level >= 3) 2168 printf("nlm_do_unlock(): caller_name = %s (sysid = %d)\n", 2169 host->nh_caller_name, host->nh_sysid); 2170 2171 nlm_free_finished_locks(host); 2172 sysid = host->nh_sysid; 2173 2174 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 2175 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2176 2177 if (time_uptime < nlm_grace_threshold) { 2178 result->stat.stat = nlm4_denied_grace_period; 2179 goto out; 2180 } 2181 2182 error = nlm_get_vfs_state(host, rqstp, &fh, &vs); 2183 if (error) { 2184 result->stat.stat = nlm_convert_error(error); 2185 goto out; 2186 } 2187 2188 fl.l_start = argp->alock.l_offset; 2189 fl.l_len = argp->alock.l_len; 2190 fl.l_pid = argp->alock.svid; 2191 fl.l_sysid = sysid; 2192 fl.l_whence = SEEK_SET; 2193 fl.l_type = F_UNLCK; 2194 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_UNLCK, &fl, F_REMOTE); 2195 2196 /* 2197 * Ignore the error - there is no result code for failure, 2198 * only for grace period. 2199 */ 2200 result->stat.stat = nlm4_granted; 2201 2202 out: 2203 nlm_release_vfs_state(&vs); 2204 if (rpcp) 2205 *rpcp = nlm_host_get_rpc(host); 2206 nlm_host_release(host); 2207 return (0); 2208 } 2209 2210 int 2211 nlm_do_granted(nlm4_testargs *argp, nlm4_res *result, struct svc_req *rqstp, 2212 2213 CLIENT **rpcp) 2214 { 2215 struct nlm_host *host; 2216 struct nlm_waiting_lock *nw; 2217 2218 memset(result, 0, sizeof(*result)); 2219 2220 host = nlm_find_host_by_addr( 2221 (struct sockaddr *) rqstp->rq_xprt->xp_rtaddr.buf, 2222 rqstp->rq_vers); 2223 if (!host) { 2224 result->stat.stat = nlm4_denied_nolocks; 2225 return (ENOMEM); 2226 } 2227 2228 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2229 result->stat.stat = nlm4_denied; 2230 2231 mtx_lock(&nlm_global_lock); 2232 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 2233 if (!nw->nw_waiting) 2234 continue; 2235 if (argp->alock.svid == nw->nw_lock.svid 2236 && argp->alock.l_offset == nw->nw_lock.l_offset 2237 && argp->alock.l_len == nw->nw_lock.l_len 2238 && argp->alock.fh.n_len == nw->nw_lock.fh.n_len 2239 && !memcmp(argp->alock.fh.n_bytes, nw->nw_lock.fh.n_bytes, 2240 nw->nw_lock.fh.n_len)) { 2241 nw->nw_waiting = FALSE; 2242 wakeup(nw); 2243 result->stat.stat = nlm4_granted; 2244 break; 2245 } 2246 } 2247 mtx_unlock(&nlm_global_lock); 2248 if (rpcp) 2249 *rpcp = nlm_host_get_rpc(host); 2250 nlm_host_release(host); 2251 return (0); 2252 } 2253 2254 void 2255 nlm_do_free_all(nlm4_notify *argp) 2256 { 2257 struct nlm_host *host, *thost; 2258 2259 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, thost) { 2260 if (!strcmp(host->nh_caller_name, argp->name)) 2261 nlm_host_notify(host, argp->state); 2262 } 2263 } 2264 2265 /* 2266 * Kernel module glue 2267 */ 2268 static int 2269 nfslockd_modevent(module_t mod, int type, void *data) 2270 { 2271 2272 return (0); 2273 } 2274 static moduledata_t nfslockd_mod = { 2275 "nfslockd", 2276 nfslockd_modevent, 2277 NULL, 2278 }; 2279 DECLARE_MODULE(nfslockd, nfslockd_mod, SI_SUB_VFS, SI_ORDER_ANY); 2280 2281 /* So that loader and kldload(2) can find us, wherever we are.. */ 2282 MODULE_DEPEND(nfslockd, krpc, 1, 1, 1); 2283 MODULE_DEPEND(nfslockd, nfs, 1, 1, 1); 2284 MODULE_VERSION(nfslockd, 1);
Cache object: fbf139c7e78faa87d765a1d079114c1a
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