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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: releng/9.1/sys/nlm/nlm_prot_impl.c 231633 2012-02-14 04:07:35Z rmacklem $"); 32 33 #include <sys/param.h> 34 #include <sys/fail.h> 35 #include <sys/fcntl.h> 36 #include <sys/kernel.h> 37 #include <sys/kthread.h> 38 #include <sys/lockf.h> 39 #include <sys/malloc.h> 40 #include <sys/mount.h> 41 #if __FreeBSD_version >= 700000 42 #include <sys/priv.h> 43 #endif 44 #include <sys/proc.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/syscall.h> 48 #include <sys/sysctl.h> 49 #include <sys/sysent.h> 50 #include <sys/syslog.h> 51 #include <sys/sysproto.h> 52 #include <sys/systm.h> 53 #include <sys/taskqueue.h> 54 #include <sys/unistd.h> 55 #include <sys/vnode.h> 56 57 #include <nfs/nfsproto.h> 58 #include <nfs/nfs_lock.h> 59 60 #include <nlm/nlm_prot.h> 61 #include <nlm/sm_inter.h> 62 #include <nlm/nlm.h> 63 #include <rpc/rpc_com.h> 64 #include <rpc/rpcb_prot.h> 65 66 MALLOC_DEFINE(M_NLM, "NLM", "Network Lock Manager"); 67 68 /* 69 * If a host is inactive (and holds no locks) for this amount of 70 * seconds, we consider it idle and stop tracking it. 71 */ 72 #define NLM_IDLE_TIMEOUT 30 73 74 /* 75 * We check the host list for idle every few seconds. 76 */ 77 #define NLM_IDLE_PERIOD 5 78 79 /* 80 * We only look for GRANTED_RES messages for a little while. 81 */ 82 #define NLM_EXPIRE_TIMEOUT 10 83 84 /* 85 * Support for sysctl vfs.nlm.sysid 86 */ 87 SYSCTL_NODE(_vfs, OID_AUTO, nlm, CTLFLAG_RW, NULL, "Network Lock Manager"); 88 SYSCTL_NODE(_vfs_nlm, OID_AUTO, sysid, CTLFLAG_RW, NULL, ""); 89 90 /* 91 * Syscall hooks 92 */ 93 static int nlm_syscall_offset = SYS_nlm_syscall; 94 static struct sysent nlm_syscall_prev_sysent; 95 #if __FreeBSD_version < 700000 96 static struct sysent nlm_syscall_sysent = { 97 (sizeof(struct nlm_syscall_args) / sizeof(register_t)) | SYF_MPSAFE, 98 (sy_call_t *) nlm_syscall 99 }; 100 #else 101 MAKE_SYSENT(nlm_syscall); 102 #endif 103 static bool_t nlm_syscall_registered = FALSE; 104 105 /* 106 * Debug level passed in from userland. We also support a sysctl hook 107 * so that it can be changed on a live system. 108 */ 109 static int nlm_debug_level; 110 SYSCTL_INT(_debug, OID_AUTO, nlm_debug, CTLFLAG_RW, &nlm_debug_level, 0, ""); 111 112 #define NLM_DEBUG(_level, args...) \ 113 do { \ 114 if (nlm_debug_level >= (_level)) \ 115 log(LOG_DEBUG, args); \ 116 } while(0) 117 #define NLM_ERR(args...) \ 118 do { \ 119 log(LOG_ERR, args); \ 120 } while(0) 121 122 /* 123 * Grace period handling. The value of nlm_grace_threshold is the 124 * value of time_uptime after which we are serving requests normally. 125 */ 126 static time_t nlm_grace_threshold; 127 128 /* 129 * We check for idle hosts if time_uptime is greater than 130 * nlm_next_idle_check, 131 */ 132 static time_t nlm_next_idle_check; 133 134 /* 135 * A socket to use for RPC - shared by all IPv4 RPC clients. 136 */ 137 static struct socket *nlm_socket; 138 139 #ifdef INET6 140 141 /* 142 * A socket to use for RPC - shared by all IPv6 RPC clients. 143 */ 144 static struct socket *nlm_socket6; 145 146 #endif 147 148 /* 149 * An RPC client handle that can be used to communicate with the local 150 * NSM. 151 */ 152 static CLIENT *nlm_nsm; 153 154 /* 155 * An AUTH handle for the server's creds. 156 */ 157 static AUTH *nlm_auth; 158 159 /* 160 * A zero timeval for sending async RPC messages. 161 */ 162 struct timeval nlm_zero_tv = { 0, 0 }; 163 164 /* 165 * The local NSM state number 166 */ 167 int nlm_nsm_state; 168 169 170 /* 171 * A lock to protect the host list and waiting lock list. 172 */ 173 static struct mtx nlm_global_lock; 174 175 /* 176 * Locks: 177 * (l) locked by nh_lock 178 * (s) only accessed via server RPC which is single threaded 179 * (g) locked by nlm_global_lock 180 * (c) const until freeing 181 * (a) modified using atomic ops 182 */ 183 184 /* 185 * A pending client-side lock request, stored on the nlm_waiting_locks 186 * list. 187 */ 188 struct nlm_waiting_lock { 189 TAILQ_ENTRY(nlm_waiting_lock) nw_link; /* (g) */ 190 bool_t nw_waiting; /* (g) */ 191 nlm4_lock nw_lock; /* (c) */ 192 union nfsfh nw_fh; /* (c) */ 193 struct vnode *nw_vp; /* (c) */ 194 }; 195 TAILQ_HEAD(nlm_waiting_lock_list, nlm_waiting_lock); 196 197 struct nlm_waiting_lock_list nlm_waiting_locks; /* (g) */ 198 199 /* 200 * A pending server-side asynchronous lock request, stored on the 201 * nh_pending list of the NLM host. 202 */ 203 struct nlm_async_lock { 204 TAILQ_ENTRY(nlm_async_lock) af_link; /* (l) host's list of locks */ 205 struct task af_task; /* (c) async callback details */ 206 void *af_cookie; /* (l) lock manager cancel token */ 207 struct vnode *af_vp; /* (l) vnode to lock */ 208 struct flock af_fl; /* (c) lock details */ 209 struct nlm_host *af_host; /* (c) host which is locking */ 210 CLIENT *af_rpc; /* (c) rpc client to send message */ 211 nlm4_testargs af_granted; /* (c) notification details */ 212 time_t af_expiretime; /* (c) notification time */ 213 }; 214 TAILQ_HEAD(nlm_async_lock_list, nlm_async_lock); 215 216 /* 217 * NLM host. 218 */ 219 enum nlm_host_state { 220 NLM_UNMONITORED, 221 NLM_MONITORED, 222 NLM_MONITOR_FAILED, 223 NLM_RECOVERING 224 }; 225 226 struct nlm_rpc { 227 CLIENT *nr_client; /* (l) RPC client handle */ 228 time_t nr_create_time; /* (l) when client was created */ 229 }; 230 231 struct nlm_host { 232 struct mtx nh_lock; 233 volatile u_int nh_refs; /* (a) reference count */ 234 TAILQ_ENTRY(nlm_host) nh_link; /* (g) global list of hosts */ 235 char nh_caller_name[MAXNAMELEN]; /* (c) printable name of host */ 236 uint32_t nh_sysid; /* (c) our allocaed system ID */ 237 char nh_sysid_string[10]; /* (c) string rep. of sysid */ 238 struct sockaddr_storage nh_addr; /* (s) remote address of host */ 239 struct nlm_rpc nh_srvrpc; /* (l) RPC for server replies */ 240 struct nlm_rpc nh_clntrpc; /* (l) RPC for client requests */ 241 rpcvers_t nh_vers; /* (s) NLM version of host */ 242 int nh_state; /* (s) last seen NSM state of host */ 243 enum nlm_host_state nh_monstate; /* (l) local NSM monitoring state */ 244 time_t nh_idle_timeout; /* (s) Time at which host is idle */ 245 struct sysctl_ctx_list nh_sysctl; /* (c) vfs.nlm.sysid nodes */ 246 uint32_t nh_grantcookie; /* (l) grant cookie counter */ 247 struct nlm_async_lock_list nh_pending; /* (l) pending async locks */ 248 struct nlm_async_lock_list nh_granted; /* (l) granted locks */ 249 struct nlm_async_lock_list nh_finished; /* (l) finished async locks */ 250 }; 251 TAILQ_HEAD(nlm_host_list, nlm_host); 252 253 static struct nlm_host_list nlm_hosts; /* (g) */ 254 static uint32_t nlm_next_sysid = 1; /* (g) */ 255 256 static void nlm_host_unmonitor(struct nlm_host *); 257 258 struct nlm_grantcookie { 259 uint32_t ng_sysid; 260 uint32_t ng_cookie; 261 }; 262 263 static inline uint32_t 264 ng_sysid(struct netobj *src) 265 { 266 267 return ((struct nlm_grantcookie *)src->n_bytes)->ng_sysid; 268 } 269 270 static inline uint32_t 271 ng_cookie(struct netobj *src) 272 { 273 274 return ((struct nlm_grantcookie *)src->n_bytes)->ng_cookie; 275 } 276 277 /**********************************************************************/ 278 279 /* 280 * Initialise NLM globals. 281 */ 282 static void 283 nlm_init(void *dummy) 284 { 285 int error; 286 287 mtx_init(&nlm_global_lock, "nlm_global_lock", NULL, MTX_DEF); 288 TAILQ_INIT(&nlm_waiting_locks); 289 TAILQ_INIT(&nlm_hosts); 290 291 error = syscall_register(&nlm_syscall_offset, &nlm_syscall_sysent, 292 &nlm_syscall_prev_sysent); 293 if (error) 294 NLM_ERR("Can't register NLM syscall\n"); 295 else 296 nlm_syscall_registered = TRUE; 297 } 298 SYSINIT(nlm_init, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_init, NULL); 299 300 static void 301 nlm_uninit(void *dummy) 302 { 303 304 if (nlm_syscall_registered) 305 syscall_deregister(&nlm_syscall_offset, 306 &nlm_syscall_prev_sysent); 307 } 308 SYSUNINIT(nlm_uninit, SI_SUB_LOCK, SI_ORDER_FIRST, nlm_uninit, NULL); 309 310 /* 311 * Create a netobj from an arbitrary source. 312 */ 313 void 314 nlm_make_netobj(struct netobj *dst, caddr_t src, size_t srcsize, 315 struct malloc_type *type) 316 { 317 318 dst->n_len = srcsize; 319 dst->n_bytes = malloc(srcsize, type, M_WAITOK); 320 memcpy(dst->n_bytes, src, srcsize); 321 } 322 323 /* 324 * Copy a struct netobj. 325 */ 326 void 327 nlm_copy_netobj(struct netobj *dst, struct netobj *src, 328 struct malloc_type *type) 329 { 330 331 nlm_make_netobj(dst, src->n_bytes, src->n_len, type); 332 } 333 334 335 /* 336 * Create an RPC client handle for the given (address,prog,vers) 337 * triple using UDP. 338 */ 339 static CLIENT * 340 nlm_get_rpc(struct sockaddr *sa, rpcprog_t prog, rpcvers_t vers) 341 { 342 char *wchan = "nlmrcv"; 343 const char* protofmly; 344 struct sockaddr_storage ss; 345 struct socket *so; 346 CLIENT *rpcb; 347 struct timeval timo; 348 RPCB parms; 349 char *uaddr; 350 enum clnt_stat stat = RPC_SUCCESS; 351 int rpcvers = RPCBVERS4; 352 bool_t do_tcp = FALSE; 353 bool_t tryagain = FALSE; 354 struct portmap mapping; 355 u_short port = 0; 356 357 /* 358 * First we need to contact the remote RPCBIND service to find 359 * the right port. 360 */ 361 memcpy(&ss, sa, sa->sa_len); 362 switch (ss.ss_family) { 363 case AF_INET: 364 ((struct sockaddr_in *)&ss)->sin_port = htons(111); 365 protofmly = "inet"; 366 so = nlm_socket; 367 break; 368 369 #ifdef INET6 370 case AF_INET6: 371 ((struct sockaddr_in6 *)&ss)->sin6_port = htons(111); 372 protofmly = "inet6"; 373 so = nlm_socket6; 374 break; 375 #endif 376 377 default: 378 /* 379 * Unsupported address family - fail. 380 */ 381 return (NULL); 382 } 383 384 rpcb = clnt_dg_create(so, (struct sockaddr *)&ss, 385 RPCBPROG, rpcvers, 0, 0); 386 if (!rpcb) 387 return (NULL); 388 389 try_tcp: 390 parms.r_prog = prog; 391 parms.r_vers = vers; 392 if (do_tcp) 393 parms.r_netid = "tcp"; 394 else 395 parms.r_netid = "udp"; 396 parms.r_addr = ""; 397 parms.r_owner = ""; 398 399 /* 400 * Use the default timeout. 401 */ 402 timo.tv_sec = 25; 403 timo.tv_usec = 0; 404 again: 405 switch (rpcvers) { 406 case RPCBVERS4: 407 case RPCBVERS: 408 /* 409 * Try RPCBIND 4 then 3. 410 */ 411 uaddr = NULL; 412 stat = CLNT_CALL(rpcb, (rpcprog_t) RPCBPROC_GETADDR, 413 (xdrproc_t) xdr_rpcb, &parms, 414 (xdrproc_t) xdr_wrapstring, &uaddr, timo); 415 if (stat == RPC_SUCCESS) { 416 /* 417 * We have a reply from the remote RPCBIND - turn it 418 * into an appropriate address and make a new client 419 * that can talk to the remote NLM. 420 * 421 * XXX fixup IPv6 scope ID. 422 */ 423 struct netbuf *a; 424 a = __rpc_uaddr2taddr_af(ss.ss_family, uaddr); 425 if (!a) { 426 tryagain = TRUE; 427 } else { 428 tryagain = FALSE; 429 memcpy(&ss, a->buf, a->len); 430 free(a->buf, M_RPC); 431 free(a, M_RPC); 432 xdr_free((xdrproc_t) xdr_wrapstring, &uaddr); 433 } 434 } 435 if (tryagain || stat == RPC_PROGVERSMISMATCH) { 436 if (rpcvers == RPCBVERS4) 437 rpcvers = RPCBVERS; 438 else if (rpcvers == RPCBVERS) 439 rpcvers = PMAPVERS; 440 CLNT_CONTROL(rpcb, CLSET_VERS, &rpcvers); 441 goto again; 442 } 443 break; 444 case PMAPVERS: 445 /* 446 * Try portmap. 447 */ 448 mapping.pm_prog = parms.r_prog; 449 mapping.pm_vers = parms.r_vers; 450 mapping.pm_prot = do_tcp ? IPPROTO_TCP : IPPROTO_UDP; 451 mapping.pm_port = 0; 452 453 stat = CLNT_CALL(rpcb, (rpcprog_t) PMAPPROC_GETPORT, 454 (xdrproc_t) xdr_portmap, &mapping, 455 (xdrproc_t) xdr_u_short, &port, timo); 456 457 if (stat == RPC_SUCCESS) { 458 switch (ss.ss_family) { 459 case AF_INET: 460 ((struct sockaddr_in *)&ss)->sin_port = 461 htons(port); 462 break; 463 464 #ifdef INET6 465 case AF_INET6: 466 ((struct sockaddr_in6 *)&ss)->sin6_port = 467 htons(port); 468 break; 469 #endif 470 } 471 } 472 break; 473 default: 474 panic("invalid rpcvers %d", rpcvers); 475 } 476 /* 477 * We may have a positive response from the portmapper, but the NLM 478 * service was not found. Make sure we received a valid port. 479 */ 480 switch (ss.ss_family) { 481 case AF_INET: 482 port = ((struct sockaddr_in *)&ss)->sin_port; 483 break; 484 #ifdef INET6 485 case AF_INET6: 486 port = ((struct sockaddr_in6 *)&ss)->sin6_port; 487 break; 488 #endif 489 } 490 if (stat != RPC_SUCCESS || !port) { 491 /* 492 * If we were able to talk to rpcbind or portmap, but the udp 493 * variant wasn't available, ask about tcp. 494 * 495 * XXX - We could also check for a TCP portmapper, but 496 * if the host is running a portmapper at all, we should be able 497 * to hail it over UDP. 498 */ 499 if (stat == RPC_SUCCESS && !do_tcp) { 500 do_tcp = TRUE; 501 goto try_tcp; 502 } 503 504 /* Otherwise, bad news. */ 505 NLM_ERR("NLM: failed to contact remote rpcbind, " 506 "stat = %d, port = %d\n", (int) stat, port); 507 CLNT_DESTROY(rpcb); 508 return (NULL); 509 } 510 511 if (do_tcp) { 512 /* 513 * Destroy the UDP client we used to speak to rpcbind and 514 * recreate as a TCP client. 515 */ 516 struct netconfig *nconf = NULL; 517 518 CLNT_DESTROY(rpcb); 519 520 switch (ss.ss_family) { 521 case AF_INET: 522 nconf = getnetconfigent("tcp"); 523 break; 524 #ifdef INET6 525 case AF_INET6: 526 nconf = getnetconfigent("tcp6"); 527 break; 528 #endif 529 } 530 531 rpcb = clnt_reconnect_create(nconf, (struct sockaddr *)&ss, 532 prog, vers, 0, 0); 533 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan); 534 rpcb->cl_auth = nlm_auth; 535 536 } else { 537 /* 538 * Re-use the client we used to speak to rpcbind. 539 */ 540 CLNT_CONTROL(rpcb, CLSET_SVC_ADDR, &ss); 541 CLNT_CONTROL(rpcb, CLSET_PROG, &prog); 542 CLNT_CONTROL(rpcb, CLSET_VERS, &vers); 543 CLNT_CONTROL(rpcb, CLSET_WAITCHAN, wchan); 544 rpcb->cl_auth = nlm_auth; 545 } 546 547 return (rpcb); 548 } 549 550 /* 551 * This async callback after when an async lock request has been 552 * granted. We notify the host which initiated the request. 553 */ 554 static void 555 nlm_lock_callback(void *arg, int pending) 556 { 557 struct nlm_async_lock *af = (struct nlm_async_lock *) arg; 558 struct rpc_callextra ext; 559 560 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) granted," 561 " cookie %d:%d\n", af, af->af_host->nh_caller_name, 562 af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie), 563 ng_cookie(&af->af_granted.cookie)); 564 565 /* 566 * Send the results back to the host. 567 * 568 * Note: there is a possible race here with nlm_host_notify 569 * destroying the RPC client. To avoid problems, the first 570 * thing nlm_host_notify does is to cancel pending async lock 571 * requests. 572 */ 573 memset(&ext, 0, sizeof(ext)); 574 ext.rc_auth = nlm_auth; 575 if (af->af_host->nh_vers == NLM_VERS4) { 576 nlm4_granted_msg_4(&af->af_granted, 577 NULL, af->af_rpc, &ext, nlm_zero_tv); 578 } else { 579 /* 580 * Back-convert to legacy protocol 581 */ 582 nlm_testargs granted; 583 granted.cookie = af->af_granted.cookie; 584 granted.exclusive = af->af_granted.exclusive; 585 granted.alock.caller_name = 586 af->af_granted.alock.caller_name; 587 granted.alock.fh = af->af_granted.alock.fh; 588 granted.alock.oh = af->af_granted.alock.oh; 589 granted.alock.svid = af->af_granted.alock.svid; 590 granted.alock.l_offset = 591 af->af_granted.alock.l_offset; 592 granted.alock.l_len = 593 af->af_granted.alock.l_len; 594 595 nlm_granted_msg_1(&granted, 596 NULL, af->af_rpc, &ext, nlm_zero_tv); 597 } 598 599 /* 600 * Move this entry to the nh_granted list. 601 */ 602 af->af_expiretime = time_uptime + NLM_EXPIRE_TIMEOUT; 603 mtx_lock(&af->af_host->nh_lock); 604 TAILQ_REMOVE(&af->af_host->nh_pending, af, af_link); 605 TAILQ_INSERT_TAIL(&af->af_host->nh_granted, af, af_link); 606 mtx_unlock(&af->af_host->nh_lock); 607 } 608 609 /* 610 * Free an async lock request. The request must have been removed from 611 * any list. 612 */ 613 static void 614 nlm_free_async_lock(struct nlm_async_lock *af) 615 { 616 /* 617 * Free an async lock. 618 */ 619 if (af->af_rpc) 620 CLNT_RELEASE(af->af_rpc); 621 xdr_free((xdrproc_t) xdr_nlm4_testargs, &af->af_granted); 622 if (af->af_vp) 623 vrele(af->af_vp); 624 free(af, M_NLM); 625 } 626 627 /* 628 * Cancel our async request - this must be called with 629 * af->nh_host->nh_lock held. This is slightly complicated by a 630 * potential race with our own callback. If we fail to cancel the 631 * lock, it must already have been granted - we make sure our async 632 * task has completed by calling taskqueue_drain in this case. 633 */ 634 static int 635 nlm_cancel_async_lock(struct nlm_async_lock *af) 636 { 637 struct nlm_host *host = af->af_host; 638 int error; 639 640 mtx_assert(&host->nh_lock, MA_OWNED); 641 642 mtx_unlock(&host->nh_lock); 643 644 error = VOP_ADVLOCKASYNC(af->af_vp, NULL, F_CANCEL, &af->af_fl, 645 F_REMOTE, NULL, &af->af_cookie); 646 647 if (error) { 648 /* 649 * We failed to cancel - make sure our callback has 650 * completed before we continue. 651 */ 652 taskqueue_drain(taskqueue_thread, &af->af_task); 653 } 654 655 mtx_lock(&host->nh_lock); 656 657 if (!error) { 658 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) " 659 "cancelled\n", af, host->nh_caller_name, host->nh_sysid); 660 661 /* 662 * Remove from the nh_pending list and free now that 663 * we are safe from the callback. 664 */ 665 TAILQ_REMOVE(&host->nh_pending, af, af_link); 666 mtx_unlock(&host->nh_lock); 667 nlm_free_async_lock(af); 668 mtx_lock(&host->nh_lock); 669 } 670 671 return (error); 672 } 673 674 static void 675 nlm_check_expired_locks(struct nlm_host *host) 676 { 677 struct nlm_async_lock *af; 678 time_t uptime = time_uptime; 679 680 mtx_lock(&host->nh_lock); 681 while ((af = TAILQ_FIRST(&host->nh_granted)) != NULL 682 && uptime >= af->af_expiretime) { 683 NLM_DEBUG(2, "NLM: async lock %p for %s (sysid %d) expired," 684 " cookie %d:%d\n", af, af->af_host->nh_caller_name, 685 af->af_host->nh_sysid, ng_sysid(&af->af_granted.cookie), 686 ng_cookie(&af->af_granted.cookie)); 687 TAILQ_REMOVE(&host->nh_granted, af, af_link); 688 mtx_unlock(&host->nh_lock); 689 nlm_free_async_lock(af); 690 mtx_lock(&host->nh_lock); 691 } 692 while ((af = TAILQ_FIRST(&host->nh_finished)) != NULL) { 693 TAILQ_REMOVE(&host->nh_finished, af, af_link); 694 mtx_unlock(&host->nh_lock); 695 nlm_free_async_lock(af); 696 mtx_lock(&host->nh_lock); 697 } 698 mtx_unlock(&host->nh_lock); 699 } 700 701 /* 702 * Free resources used by a host. This is called after the reference 703 * count has reached zero so it doesn't need to worry about locks. 704 */ 705 static void 706 nlm_host_destroy(struct nlm_host *host) 707 { 708 709 mtx_lock(&nlm_global_lock); 710 TAILQ_REMOVE(&nlm_hosts, host, nh_link); 711 mtx_unlock(&nlm_global_lock); 712 713 if (host->nh_srvrpc.nr_client) 714 CLNT_RELEASE(host->nh_srvrpc.nr_client); 715 if (host->nh_clntrpc.nr_client) 716 CLNT_RELEASE(host->nh_clntrpc.nr_client); 717 mtx_destroy(&host->nh_lock); 718 sysctl_ctx_free(&host->nh_sysctl); 719 free(host, M_NLM); 720 } 721 722 /* 723 * Thread start callback for client lock recovery 724 */ 725 static void 726 nlm_client_recovery_start(void *arg) 727 { 728 struct nlm_host *host = (struct nlm_host *) arg; 729 730 NLM_DEBUG(1, "NLM: client lock recovery for %s started\n", 731 host->nh_caller_name); 732 733 nlm_client_recovery(host); 734 735 NLM_DEBUG(1, "NLM: client lock recovery for %s completed\n", 736 host->nh_caller_name); 737 738 host->nh_monstate = NLM_MONITORED; 739 nlm_host_release(host); 740 741 kthread_exit(); 742 } 743 744 /* 745 * This is called when we receive a host state change notification. We 746 * unlock any active locks owned by the host. When rpc.lockd is 747 * shutting down, this function is called with newstate set to zero 748 * which allows us to cancel any pending async locks and clear the 749 * locking state. 750 */ 751 static void 752 nlm_host_notify(struct nlm_host *host, int newstate) 753 { 754 struct nlm_async_lock *af; 755 756 if (newstate) { 757 NLM_DEBUG(1, "NLM: host %s (sysid %d) rebooted, new " 758 "state is %d\n", host->nh_caller_name, 759 host->nh_sysid, newstate); 760 } 761 762 /* 763 * Cancel any pending async locks for this host. 764 */ 765 mtx_lock(&host->nh_lock); 766 while ((af = TAILQ_FIRST(&host->nh_pending)) != NULL) { 767 /* 768 * nlm_cancel_async_lock will remove the entry from 769 * nh_pending and free it. 770 */ 771 nlm_cancel_async_lock(af); 772 } 773 mtx_unlock(&host->nh_lock); 774 nlm_check_expired_locks(host); 775 776 /* 777 * The host just rebooted - trash its locks. 778 */ 779 lf_clearremotesys(host->nh_sysid); 780 host->nh_state = newstate; 781 782 /* 783 * If we have any remote locks for this host (i.e. it 784 * represents a remote NFS server that our local NFS client 785 * has locks for), start a recovery thread. 786 */ 787 if (newstate != 0 788 && host->nh_monstate != NLM_RECOVERING 789 && lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid) > 0) { 790 struct thread *td; 791 host->nh_monstate = NLM_RECOVERING; 792 refcount_acquire(&host->nh_refs); 793 kthread_add(nlm_client_recovery_start, host, curproc, &td, 0, 0, 794 "NFS lock recovery for %s", host->nh_caller_name); 795 } 796 } 797 798 /* 799 * Sysctl handler to count the number of locks for a sysid. 800 */ 801 static int 802 nlm_host_lock_count_sysctl(SYSCTL_HANDLER_ARGS) 803 { 804 struct nlm_host *host; 805 int count; 806 807 host = oidp->oid_arg1; 808 count = lf_countlocks(host->nh_sysid); 809 return sysctl_handle_int(oidp, &count, 0, req); 810 } 811 812 /* 813 * Sysctl handler to count the number of client locks for a sysid. 814 */ 815 static int 816 nlm_host_client_lock_count_sysctl(SYSCTL_HANDLER_ARGS) 817 { 818 struct nlm_host *host; 819 int count; 820 821 host = oidp->oid_arg1; 822 count = lf_countlocks(NLM_SYSID_CLIENT | host->nh_sysid); 823 return sysctl_handle_int(oidp, &count, 0, req); 824 } 825 826 /* 827 * Create a new NLM host. 828 */ 829 static struct nlm_host * 830 nlm_create_host(const char* caller_name) 831 { 832 struct nlm_host *host; 833 struct sysctl_oid *oid; 834 835 mtx_assert(&nlm_global_lock, MA_OWNED); 836 837 NLM_DEBUG(1, "NLM: new host %s (sysid %d)\n", 838 caller_name, nlm_next_sysid); 839 host = malloc(sizeof(struct nlm_host), M_NLM, M_NOWAIT|M_ZERO); 840 if (!host) 841 return (NULL); 842 mtx_init(&host->nh_lock, "nh_lock", NULL, MTX_DEF); 843 host->nh_refs = 1; 844 strlcpy(host->nh_caller_name, caller_name, MAXNAMELEN); 845 host->nh_sysid = nlm_next_sysid++; 846 snprintf(host->nh_sysid_string, sizeof(host->nh_sysid_string), 847 "%d", host->nh_sysid); 848 host->nh_vers = 0; 849 host->nh_state = 0; 850 host->nh_monstate = NLM_UNMONITORED; 851 host->nh_grantcookie = 1; 852 TAILQ_INIT(&host->nh_pending); 853 TAILQ_INIT(&host->nh_granted); 854 TAILQ_INIT(&host->nh_finished); 855 TAILQ_INSERT_TAIL(&nlm_hosts, host, nh_link); 856 857 mtx_unlock(&nlm_global_lock); 858 859 sysctl_ctx_init(&host->nh_sysctl); 860 oid = SYSCTL_ADD_NODE(&host->nh_sysctl, 861 SYSCTL_STATIC_CHILDREN(_vfs_nlm_sysid), 862 OID_AUTO, host->nh_sysid_string, CTLFLAG_RD, NULL, ""); 863 SYSCTL_ADD_STRING(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 864 "hostname", CTLFLAG_RD, host->nh_caller_name, 0, ""); 865 SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 866 "version", CTLFLAG_RD, &host->nh_vers, 0, ""); 867 SYSCTL_ADD_UINT(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 868 "monitored", CTLFLAG_RD, &host->nh_monstate, 0, ""); 869 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 870 "lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0, 871 nlm_host_lock_count_sysctl, "I", ""); 872 SYSCTL_ADD_PROC(&host->nh_sysctl, SYSCTL_CHILDREN(oid), OID_AUTO, 873 "client_lock_count", CTLTYPE_INT | CTLFLAG_RD, host, 0, 874 nlm_host_client_lock_count_sysctl, "I", ""); 875 876 mtx_lock(&nlm_global_lock); 877 878 return (host); 879 } 880 881 /* 882 * Acquire the next sysid for remote locks not handled by the NLM. 883 */ 884 uint32_t 885 nlm_acquire_next_sysid(void) 886 { 887 uint32_t next_sysid; 888 889 mtx_lock(&nlm_global_lock); 890 next_sysid = nlm_next_sysid++; 891 mtx_unlock(&nlm_global_lock); 892 return (next_sysid); 893 } 894 895 /* 896 * Return non-zero if the address parts of the two sockaddrs are the 897 * same. 898 */ 899 static int 900 nlm_compare_addr(const struct sockaddr *a, const struct sockaddr *b) 901 { 902 const struct sockaddr_in *a4, *b4; 903 #ifdef INET6 904 const struct sockaddr_in6 *a6, *b6; 905 #endif 906 907 if (a->sa_family != b->sa_family) 908 return (FALSE); 909 910 switch (a->sa_family) { 911 case AF_INET: 912 a4 = (const struct sockaddr_in *) a; 913 b4 = (const struct sockaddr_in *) b; 914 return !memcmp(&a4->sin_addr, &b4->sin_addr, 915 sizeof(a4->sin_addr)); 916 #ifdef INET6 917 case AF_INET6: 918 a6 = (const struct sockaddr_in6 *) a; 919 b6 = (const struct sockaddr_in6 *) b; 920 return !memcmp(&a6->sin6_addr, &b6->sin6_addr, 921 sizeof(a6->sin6_addr)); 922 #endif 923 } 924 925 return (0); 926 } 927 928 /* 929 * Check for idle hosts and stop monitoring them. We could also free 930 * the host structure here, possibly after a larger timeout but that 931 * would require some care to avoid races with 932 * e.g. nlm_host_lock_count_sysctl. 933 */ 934 static void 935 nlm_check_idle(void) 936 { 937 struct nlm_host *host; 938 939 mtx_assert(&nlm_global_lock, MA_OWNED); 940 941 if (time_uptime <= nlm_next_idle_check) 942 return; 943 944 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD; 945 946 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 947 if (host->nh_monstate == NLM_MONITORED 948 && time_uptime > host->nh_idle_timeout) { 949 mtx_unlock(&nlm_global_lock); 950 if (lf_countlocks(host->nh_sysid) > 0 951 || lf_countlocks(NLM_SYSID_CLIENT 952 + host->nh_sysid)) { 953 host->nh_idle_timeout = 954 time_uptime + NLM_IDLE_TIMEOUT; 955 mtx_lock(&nlm_global_lock); 956 continue; 957 } 958 nlm_host_unmonitor(host); 959 mtx_lock(&nlm_global_lock); 960 } 961 } 962 } 963 964 /* 965 * Search for an existing NLM host that matches the given name 966 * (typically the caller_name element of an nlm4_lock). If none is 967 * found, create a new host. If 'addr' is non-NULL, record the remote 968 * address of the host so that we can call it back for async 969 * responses. If 'vers' is greater than zero then record the NLM 970 * program version to use to communicate with this client. 971 */ 972 struct nlm_host * 973 nlm_find_host_by_name(const char *name, const struct sockaddr *addr, 974 rpcvers_t vers) 975 { 976 struct nlm_host *host; 977 978 mtx_lock(&nlm_global_lock); 979 980 /* 981 * The remote host is determined by caller_name. 982 */ 983 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 984 if (!strcmp(host->nh_caller_name, name)) 985 break; 986 } 987 988 if (!host) { 989 host = nlm_create_host(name); 990 if (!host) { 991 mtx_unlock(&nlm_global_lock); 992 return (NULL); 993 } 994 } 995 refcount_acquire(&host->nh_refs); 996 997 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT; 998 999 /* 1000 * If we have an address for the host, record it so that we 1001 * can send async replies etc. 1002 */ 1003 if (addr) { 1004 1005 KASSERT(addr->sa_len < sizeof(struct sockaddr_storage), 1006 ("Strange remote transport address length")); 1007 1008 /* 1009 * If we have seen an address before and we currently 1010 * have an RPC client handle, make sure the address is 1011 * the same, otherwise discard the client handle. 1012 */ 1013 if (host->nh_addr.ss_len && host->nh_srvrpc.nr_client) { 1014 if (!nlm_compare_addr( 1015 (struct sockaddr *) &host->nh_addr, 1016 addr) 1017 || host->nh_vers != vers) { 1018 CLIENT *client; 1019 mtx_lock(&host->nh_lock); 1020 client = host->nh_srvrpc.nr_client; 1021 host->nh_srvrpc.nr_client = NULL; 1022 mtx_unlock(&host->nh_lock); 1023 if (client) { 1024 CLNT_RELEASE(client); 1025 } 1026 } 1027 } 1028 memcpy(&host->nh_addr, addr, addr->sa_len); 1029 host->nh_vers = vers; 1030 } 1031 1032 nlm_check_idle(); 1033 1034 mtx_unlock(&nlm_global_lock); 1035 1036 return (host); 1037 } 1038 1039 /* 1040 * Search for an existing NLM host that matches the given remote 1041 * address. If none is found, create a new host with the requested 1042 * address and remember 'vers' as the NLM protocol version to use for 1043 * that host. 1044 */ 1045 struct nlm_host * 1046 nlm_find_host_by_addr(const struct sockaddr *addr, int vers) 1047 { 1048 /* 1049 * Fake up a name using inet_ntop. This buffer is 1050 * large enough for an IPv6 address. 1051 */ 1052 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"]; 1053 struct nlm_host *host; 1054 1055 switch (addr->sa_family) { 1056 case AF_INET: 1057 inet_ntop(AF_INET, 1058 &((const struct sockaddr_in *) addr)->sin_addr, 1059 tmp, sizeof tmp); 1060 break; 1061 #ifdef INET6 1062 case AF_INET6: 1063 inet_ntop(AF_INET6, 1064 &((const struct sockaddr_in6 *) addr)->sin6_addr, 1065 tmp, sizeof tmp); 1066 break; 1067 #endif 1068 default: 1069 strcmp(tmp, "<unknown>"); 1070 } 1071 1072 1073 mtx_lock(&nlm_global_lock); 1074 1075 /* 1076 * The remote host is determined by caller_name. 1077 */ 1078 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 1079 if (nlm_compare_addr(addr, 1080 (const struct sockaddr *) &host->nh_addr)) 1081 break; 1082 } 1083 1084 if (!host) { 1085 host = nlm_create_host(tmp); 1086 if (!host) { 1087 mtx_unlock(&nlm_global_lock); 1088 return (NULL); 1089 } 1090 memcpy(&host->nh_addr, addr, addr->sa_len); 1091 host->nh_vers = vers; 1092 } 1093 refcount_acquire(&host->nh_refs); 1094 1095 host->nh_idle_timeout = time_uptime + NLM_IDLE_TIMEOUT; 1096 1097 nlm_check_idle(); 1098 1099 mtx_unlock(&nlm_global_lock); 1100 1101 return (host); 1102 } 1103 1104 /* 1105 * Find the NLM host that matches the value of 'sysid'. If none 1106 * exists, return NULL. 1107 */ 1108 static struct nlm_host * 1109 nlm_find_host_by_sysid(int sysid) 1110 { 1111 struct nlm_host *host; 1112 1113 TAILQ_FOREACH(host, &nlm_hosts, nh_link) { 1114 if (host->nh_sysid == sysid) { 1115 refcount_acquire(&host->nh_refs); 1116 return (host); 1117 } 1118 } 1119 1120 return (NULL); 1121 } 1122 1123 void nlm_host_release(struct nlm_host *host) 1124 { 1125 if (refcount_release(&host->nh_refs)) { 1126 /* 1127 * Free the host 1128 */ 1129 nlm_host_destroy(host); 1130 } 1131 } 1132 1133 /* 1134 * Unregister this NLM host with the local NSM due to idleness. 1135 */ 1136 static void 1137 nlm_host_unmonitor(struct nlm_host *host) 1138 { 1139 mon_id smmonid; 1140 sm_stat_res smstat; 1141 struct timeval timo; 1142 enum clnt_stat stat; 1143 1144 NLM_DEBUG(1, "NLM: unmonitoring %s (sysid %d)\n", 1145 host->nh_caller_name, host->nh_sysid); 1146 1147 /* 1148 * We put our assigned system ID value in the priv field to 1149 * make it simpler to find the host if we are notified of a 1150 * host restart. 1151 */ 1152 smmonid.mon_name = host->nh_caller_name; 1153 smmonid.my_id.my_name = "localhost"; 1154 smmonid.my_id.my_prog = NLM_PROG; 1155 smmonid.my_id.my_vers = NLM_SM; 1156 smmonid.my_id.my_proc = NLM_SM_NOTIFY; 1157 1158 timo.tv_sec = 25; 1159 timo.tv_usec = 0; 1160 stat = CLNT_CALL(nlm_nsm, SM_UNMON, 1161 (xdrproc_t) xdr_mon, &smmonid, 1162 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1163 1164 if (stat != RPC_SUCCESS) { 1165 NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat); 1166 return; 1167 } 1168 if (smstat.res_stat == stat_fail) { 1169 NLM_ERR("Local NSM refuses to unmonitor %s\n", 1170 host->nh_caller_name); 1171 return; 1172 } 1173 1174 host->nh_monstate = NLM_UNMONITORED; 1175 } 1176 1177 /* 1178 * Register this NLM host with the local NSM so that we can be 1179 * notified if it reboots. 1180 */ 1181 void 1182 nlm_host_monitor(struct nlm_host *host, int state) 1183 { 1184 mon smmon; 1185 sm_stat_res smstat; 1186 struct timeval timo; 1187 enum clnt_stat stat; 1188 1189 if (state && !host->nh_state) { 1190 /* 1191 * This is the first time we have seen an NSM state 1192 * value for this host. We record it here to help 1193 * detect host reboots. 1194 */ 1195 host->nh_state = state; 1196 NLM_DEBUG(1, "NLM: host %s (sysid %d) has NSM state %d\n", 1197 host->nh_caller_name, host->nh_sysid, state); 1198 } 1199 1200 mtx_lock(&host->nh_lock); 1201 if (host->nh_monstate != NLM_UNMONITORED) { 1202 mtx_unlock(&host->nh_lock); 1203 return; 1204 } 1205 host->nh_monstate = NLM_MONITORED; 1206 mtx_unlock(&host->nh_lock); 1207 1208 NLM_DEBUG(1, "NLM: monitoring %s (sysid %d)\n", 1209 host->nh_caller_name, host->nh_sysid); 1210 1211 /* 1212 * We put our assigned system ID value in the priv field to 1213 * make it simpler to find the host if we are notified of a 1214 * host restart. 1215 */ 1216 smmon.mon_id.mon_name = host->nh_caller_name; 1217 smmon.mon_id.my_id.my_name = "localhost"; 1218 smmon.mon_id.my_id.my_prog = NLM_PROG; 1219 smmon.mon_id.my_id.my_vers = NLM_SM; 1220 smmon.mon_id.my_id.my_proc = NLM_SM_NOTIFY; 1221 memcpy(smmon.priv, &host->nh_sysid, sizeof(host->nh_sysid)); 1222 1223 timo.tv_sec = 25; 1224 timo.tv_usec = 0; 1225 stat = CLNT_CALL(nlm_nsm, SM_MON, 1226 (xdrproc_t) xdr_mon, &smmon, 1227 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1228 1229 if (stat != RPC_SUCCESS) { 1230 NLM_ERR("Failed to contact local NSM - rpc error %d\n", stat); 1231 return; 1232 } 1233 if (smstat.res_stat == stat_fail) { 1234 NLM_ERR("Local NSM refuses to monitor %s\n", 1235 host->nh_caller_name); 1236 mtx_lock(&host->nh_lock); 1237 host->nh_monstate = NLM_MONITOR_FAILED; 1238 mtx_unlock(&host->nh_lock); 1239 return; 1240 } 1241 1242 host->nh_monstate = NLM_MONITORED; 1243 } 1244 1245 /* 1246 * Return an RPC client handle that can be used to talk to the NLM 1247 * running on the given host. 1248 */ 1249 CLIENT * 1250 nlm_host_get_rpc(struct nlm_host *host, bool_t isserver) 1251 { 1252 struct nlm_rpc *rpc; 1253 CLIENT *client; 1254 1255 mtx_lock(&host->nh_lock); 1256 1257 if (isserver) 1258 rpc = &host->nh_srvrpc; 1259 else 1260 rpc = &host->nh_clntrpc; 1261 1262 /* 1263 * We can't hold onto RPC handles for too long - the async 1264 * call/reply protocol used by some NLM clients makes it hard 1265 * to tell when they change port numbers (e.g. after a 1266 * reboot). Note that if a client reboots while it isn't 1267 * holding any locks, it won't bother to notify us. We 1268 * expire the RPC handles after two minutes. 1269 */ 1270 if (rpc->nr_client && time_uptime > rpc->nr_create_time + 2*60) { 1271 client = rpc->nr_client; 1272 rpc->nr_client = NULL; 1273 mtx_unlock(&host->nh_lock); 1274 CLNT_RELEASE(client); 1275 mtx_lock(&host->nh_lock); 1276 } 1277 1278 if (!rpc->nr_client) { 1279 mtx_unlock(&host->nh_lock); 1280 client = nlm_get_rpc((struct sockaddr *)&host->nh_addr, 1281 NLM_PROG, host->nh_vers); 1282 mtx_lock(&host->nh_lock); 1283 1284 if (client) { 1285 if (rpc->nr_client) { 1286 mtx_unlock(&host->nh_lock); 1287 CLNT_DESTROY(client); 1288 mtx_lock(&host->nh_lock); 1289 } else { 1290 rpc->nr_client = client; 1291 rpc->nr_create_time = time_uptime; 1292 } 1293 } 1294 } 1295 1296 client = rpc->nr_client; 1297 if (client) 1298 CLNT_ACQUIRE(client); 1299 mtx_unlock(&host->nh_lock); 1300 1301 return (client); 1302 1303 } 1304 1305 int nlm_host_get_sysid(struct nlm_host *host) 1306 { 1307 1308 return (host->nh_sysid); 1309 } 1310 1311 int 1312 nlm_host_get_state(struct nlm_host *host) 1313 { 1314 1315 return (host->nh_state); 1316 } 1317 1318 void * 1319 nlm_register_wait_lock(struct nlm4_lock *lock, struct vnode *vp) 1320 { 1321 struct nlm_waiting_lock *nw; 1322 1323 nw = malloc(sizeof(struct nlm_waiting_lock), M_NLM, M_WAITOK); 1324 nw->nw_lock = *lock; 1325 memcpy(&nw->nw_fh.fh_bytes, nw->nw_lock.fh.n_bytes, 1326 nw->nw_lock.fh.n_len); 1327 nw->nw_lock.fh.n_bytes = nw->nw_fh.fh_bytes; 1328 nw->nw_waiting = TRUE; 1329 nw->nw_vp = vp; 1330 mtx_lock(&nlm_global_lock); 1331 TAILQ_INSERT_TAIL(&nlm_waiting_locks, nw, nw_link); 1332 mtx_unlock(&nlm_global_lock); 1333 1334 return nw; 1335 } 1336 1337 void 1338 nlm_deregister_wait_lock(void *handle) 1339 { 1340 struct nlm_waiting_lock *nw = handle; 1341 1342 mtx_lock(&nlm_global_lock); 1343 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link); 1344 mtx_unlock(&nlm_global_lock); 1345 1346 free(nw, M_NLM); 1347 } 1348 1349 int 1350 nlm_wait_lock(void *handle, int timo) 1351 { 1352 struct nlm_waiting_lock *nw = handle; 1353 int error; 1354 1355 /* 1356 * If the granted message arrived before we got here, 1357 * nw->nw_waiting will be FALSE - in that case, don't sleep. 1358 */ 1359 mtx_lock(&nlm_global_lock); 1360 error = 0; 1361 if (nw->nw_waiting) 1362 error = msleep(nw, &nlm_global_lock, PCATCH, "nlmlock", timo); 1363 TAILQ_REMOVE(&nlm_waiting_locks, nw, nw_link); 1364 if (error) { 1365 /* 1366 * The granted message may arrive after the 1367 * interrupt/timeout but before we manage to lock the 1368 * mutex. Detect this by examining nw_lock. 1369 */ 1370 if (!nw->nw_waiting) 1371 error = 0; 1372 } else { 1373 /* 1374 * If nlm_cancel_wait is called, then error will be 1375 * zero but nw_waiting will still be TRUE. We 1376 * translate this into EINTR. 1377 */ 1378 if (nw->nw_waiting) 1379 error = EINTR; 1380 } 1381 mtx_unlock(&nlm_global_lock); 1382 1383 free(nw, M_NLM); 1384 1385 return (error); 1386 } 1387 1388 void 1389 nlm_cancel_wait(struct vnode *vp) 1390 { 1391 struct nlm_waiting_lock *nw; 1392 1393 mtx_lock(&nlm_global_lock); 1394 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 1395 if (nw->nw_vp == vp) { 1396 wakeup(nw); 1397 } 1398 } 1399 mtx_unlock(&nlm_global_lock); 1400 } 1401 1402 1403 /**********************************************************************/ 1404 1405 /* 1406 * Syscall interface with userland. 1407 */ 1408 1409 extern void nlm_prog_0(struct svc_req *rqstp, SVCXPRT *transp); 1410 extern void nlm_prog_1(struct svc_req *rqstp, SVCXPRT *transp); 1411 extern void nlm_prog_3(struct svc_req *rqstp, SVCXPRT *transp); 1412 extern void nlm_prog_4(struct svc_req *rqstp, SVCXPRT *transp); 1413 1414 static int 1415 nlm_register_services(SVCPOOL *pool, int addr_count, char **addrs) 1416 { 1417 static rpcvers_t versions[] = { 1418 NLM_SM, NLM_VERS, NLM_VERSX, NLM_VERS4 1419 }; 1420 static void (*dispatchers[])(struct svc_req *, SVCXPRT *) = { 1421 nlm_prog_0, nlm_prog_1, nlm_prog_3, nlm_prog_4 1422 }; 1423 static const int version_count = sizeof(versions) / sizeof(versions[0]); 1424 1425 SVCXPRT **xprts; 1426 char netid[16]; 1427 char uaddr[128]; 1428 struct netconfig *nconf; 1429 int i, j, error; 1430 1431 if (!addr_count) { 1432 NLM_ERR("NLM: no service addresses given - can't start server"); 1433 return (EINVAL); 1434 } 1435 1436 xprts = malloc(addr_count * sizeof(SVCXPRT *), M_NLM, M_WAITOK|M_ZERO); 1437 for (i = 0; i < version_count; i++) { 1438 for (j = 0; j < addr_count; j++) { 1439 /* 1440 * Create transports for the first version and 1441 * then just register everything else to the 1442 * same transports. 1443 */ 1444 if (i == 0) { 1445 char *up; 1446 1447 error = copyin(&addrs[2*j], &up, 1448 sizeof(char*)); 1449 if (error) 1450 goto out; 1451 error = copyinstr(up, netid, sizeof(netid), 1452 NULL); 1453 if (error) 1454 goto out; 1455 error = copyin(&addrs[2*j+1], &up, 1456 sizeof(char*)); 1457 if (error) 1458 goto out; 1459 error = copyinstr(up, uaddr, sizeof(uaddr), 1460 NULL); 1461 if (error) 1462 goto out; 1463 nconf = getnetconfigent(netid); 1464 if (!nconf) { 1465 NLM_ERR("Can't lookup netid %s\n", 1466 netid); 1467 error = EINVAL; 1468 goto out; 1469 } 1470 xprts[j] = svc_tp_create(pool, dispatchers[i], 1471 NLM_PROG, versions[i], uaddr, nconf); 1472 if (!xprts[j]) { 1473 NLM_ERR("NLM: unable to create " 1474 "(NLM_PROG, %d).\n", versions[i]); 1475 error = EINVAL; 1476 goto out; 1477 } 1478 freenetconfigent(nconf); 1479 } else { 1480 nconf = getnetconfigent(xprts[j]->xp_netid); 1481 rpcb_unset(NLM_PROG, versions[i], nconf); 1482 if (!svc_reg(xprts[j], NLM_PROG, versions[i], 1483 dispatchers[i], nconf)) { 1484 NLM_ERR("NLM: can't register " 1485 "(NLM_PROG, %d)\n", versions[i]); 1486 error = EINVAL; 1487 goto out; 1488 } 1489 } 1490 } 1491 } 1492 error = 0; 1493 out: 1494 for (j = 0; j < addr_count; j++) { 1495 if (xprts[j]) 1496 SVC_RELEASE(xprts[j]); 1497 } 1498 free(xprts, M_NLM); 1499 return (error); 1500 } 1501 1502 /* 1503 * Main server entry point. Contacts the local NSM to get its current 1504 * state and send SM_UNMON_ALL. Registers the NLM services and then 1505 * services requests. Does not return until the server is interrupted 1506 * by a signal. 1507 */ 1508 static int 1509 nlm_server_main(int addr_count, char **addrs) 1510 { 1511 struct thread *td = curthread; 1512 int error; 1513 SVCPOOL *pool = NULL; 1514 struct sockopt opt; 1515 int portlow; 1516 #ifdef INET6 1517 struct sockaddr_in6 sin6; 1518 #endif 1519 struct sockaddr_in sin; 1520 my_id id; 1521 sm_stat smstat; 1522 struct timeval timo; 1523 enum clnt_stat stat; 1524 struct nlm_host *host, *nhost; 1525 struct nlm_waiting_lock *nw; 1526 vop_advlock_t *old_nfs_advlock; 1527 vop_reclaim_t *old_nfs_reclaim; 1528 int v4_used; 1529 #ifdef INET6 1530 int v6_used; 1531 #endif 1532 1533 if (nlm_socket) { 1534 NLM_ERR("NLM: can't start server - " 1535 "it appears to be running already\n"); 1536 return (EPERM); 1537 } 1538 1539 memset(&opt, 0, sizeof(opt)); 1540 1541 nlm_socket = NULL; 1542 error = socreate(AF_INET, &nlm_socket, SOCK_DGRAM, 0, 1543 td->td_ucred, td); 1544 if (error) { 1545 NLM_ERR("NLM: can't create IPv4 socket - error %d\n", error); 1546 return (error); 1547 } 1548 opt.sopt_dir = SOPT_SET; 1549 opt.sopt_level = IPPROTO_IP; 1550 opt.sopt_name = IP_PORTRANGE; 1551 portlow = IP_PORTRANGE_LOW; 1552 opt.sopt_val = &portlow; 1553 opt.sopt_valsize = sizeof(portlow); 1554 sosetopt(nlm_socket, &opt); 1555 1556 #ifdef INET6 1557 nlm_socket6 = NULL; 1558 error = socreate(AF_INET6, &nlm_socket6, SOCK_DGRAM, 0, 1559 td->td_ucred, td); 1560 if (error) { 1561 NLM_ERR("NLM: can't create IPv6 socket - error %d\n", error); 1562 goto out; 1563 return (error); 1564 } 1565 opt.sopt_dir = SOPT_SET; 1566 opt.sopt_level = IPPROTO_IPV6; 1567 opt.sopt_name = IPV6_PORTRANGE; 1568 portlow = IPV6_PORTRANGE_LOW; 1569 opt.sopt_val = &portlow; 1570 opt.sopt_valsize = sizeof(portlow); 1571 sosetopt(nlm_socket6, &opt); 1572 #endif 1573 1574 nlm_auth = authunix_create(curthread->td_ucred); 1575 1576 #ifdef INET6 1577 memset(&sin6, 0, sizeof(sin6)); 1578 sin6.sin6_len = sizeof(sin6); 1579 sin6.sin6_family = AF_INET6; 1580 sin6.sin6_addr = in6addr_loopback; 1581 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin6, SM_PROG, SM_VERS); 1582 if (!nlm_nsm) { 1583 #endif 1584 memset(&sin, 0, sizeof(sin)); 1585 sin.sin_len = sizeof(sin); 1586 sin.sin_family = AF_INET; 1587 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 1588 nlm_nsm = nlm_get_rpc((struct sockaddr *) &sin, SM_PROG, 1589 SM_VERS); 1590 #ifdef INET6 1591 } 1592 #endif 1593 1594 if (!nlm_nsm) { 1595 NLM_ERR("Can't start NLM - unable to contact NSM\n"); 1596 error = EINVAL; 1597 goto out; 1598 } 1599 1600 pool = svcpool_create("NLM", NULL); 1601 1602 error = nlm_register_services(pool, addr_count, addrs); 1603 if (error) 1604 goto out; 1605 1606 memset(&id, 0, sizeof(id)); 1607 id.my_name = "NFS NLM"; 1608 1609 timo.tv_sec = 25; 1610 timo.tv_usec = 0; 1611 stat = CLNT_CALL(nlm_nsm, SM_UNMON_ALL, 1612 (xdrproc_t) xdr_my_id, &id, 1613 (xdrproc_t) xdr_sm_stat, &smstat, timo); 1614 1615 if (stat != RPC_SUCCESS) { 1616 struct rpc_err err; 1617 1618 CLNT_GETERR(nlm_nsm, &err); 1619 NLM_ERR("NLM: unexpected error contacting NSM, " 1620 "stat=%d, errno=%d\n", stat, err.re_errno); 1621 error = EINVAL; 1622 goto out; 1623 } 1624 1625 NLM_DEBUG(1, "NLM: local NSM state is %d\n", smstat.state); 1626 nlm_nsm_state = smstat.state; 1627 1628 old_nfs_advlock = nfs_advlock_p; 1629 nfs_advlock_p = nlm_advlock; 1630 old_nfs_reclaim = nfs_reclaim_p; 1631 nfs_reclaim_p = nlm_reclaim; 1632 1633 svc_run(pool); 1634 error = 0; 1635 1636 nfs_advlock_p = old_nfs_advlock; 1637 nfs_reclaim_p = old_nfs_reclaim; 1638 1639 out: 1640 if (pool) 1641 svcpool_destroy(pool); 1642 1643 /* 1644 * We are finished communicating with the NSM. 1645 */ 1646 if (nlm_nsm) { 1647 CLNT_RELEASE(nlm_nsm); 1648 nlm_nsm = NULL; 1649 } 1650 1651 /* 1652 * Trash all the existing state so that if the server 1653 * restarts, it gets a clean slate. This is complicated by the 1654 * possibility that there may be other threads trying to make 1655 * client locking requests. 1656 * 1657 * First we fake a client reboot notification which will 1658 * cancel any pending async locks and purge remote lock state 1659 * from the local lock manager. We release the reference from 1660 * nlm_hosts to the host (which may remove it from the list 1661 * and free it). After this phase, the only entries in the 1662 * nlm_host list should be from other threads performing 1663 * client lock requests. We arrange to defer closing the 1664 * sockets until the last RPC client handle is released. 1665 */ 1666 v4_used = 0; 1667 #ifdef INET6 1668 v6_used = 0; 1669 #endif 1670 mtx_lock(&nlm_global_lock); 1671 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 1672 wakeup(nw); 1673 } 1674 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) { 1675 mtx_unlock(&nlm_global_lock); 1676 nlm_host_notify(host, 0); 1677 nlm_host_release(host); 1678 mtx_lock(&nlm_global_lock); 1679 } 1680 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, nhost) { 1681 mtx_lock(&host->nh_lock); 1682 if (host->nh_srvrpc.nr_client 1683 || host->nh_clntrpc.nr_client) { 1684 if (host->nh_addr.ss_family == AF_INET) 1685 v4_used++; 1686 #ifdef INET6 1687 if (host->nh_addr.ss_family == AF_INET6) 1688 v6_used++; 1689 #endif 1690 /* 1691 * Note that the rpc over udp code copes 1692 * correctly with the fact that a socket may 1693 * be used by many rpc handles. 1694 */ 1695 if (host->nh_srvrpc.nr_client) 1696 CLNT_CONTROL(host->nh_srvrpc.nr_client, 1697 CLSET_FD_CLOSE, 0); 1698 if (host->nh_clntrpc.nr_client) 1699 CLNT_CONTROL(host->nh_clntrpc.nr_client, 1700 CLSET_FD_CLOSE, 0); 1701 } 1702 mtx_unlock(&host->nh_lock); 1703 } 1704 mtx_unlock(&nlm_global_lock); 1705 1706 AUTH_DESTROY(nlm_auth); 1707 1708 if (!v4_used) 1709 soclose(nlm_socket); 1710 nlm_socket = NULL; 1711 #ifdef INET6 1712 if (!v6_used) 1713 soclose(nlm_socket6); 1714 nlm_socket6 = NULL; 1715 #endif 1716 1717 return (error); 1718 } 1719 1720 int 1721 sys_nlm_syscall(struct thread *td, struct nlm_syscall_args *uap) 1722 { 1723 int error; 1724 1725 #if __FreeBSD_version >= 700000 1726 error = priv_check(td, PRIV_NFS_LOCKD); 1727 #else 1728 error = suser(td); 1729 #endif 1730 if (error) 1731 return (error); 1732 1733 nlm_debug_level = uap->debug_level; 1734 nlm_grace_threshold = time_uptime + uap->grace_period; 1735 nlm_next_idle_check = time_uptime + NLM_IDLE_PERIOD; 1736 1737 return nlm_server_main(uap->addr_count, uap->addrs); 1738 } 1739 1740 /**********************************************************************/ 1741 1742 /* 1743 * NLM implementation details, called from the RPC stubs. 1744 */ 1745 1746 1747 void 1748 nlm_sm_notify(struct nlm_sm_status *argp) 1749 { 1750 uint32_t sysid; 1751 struct nlm_host *host; 1752 1753 NLM_DEBUG(3, "nlm_sm_notify(): mon_name = %s\n", argp->mon_name); 1754 memcpy(&sysid, &argp->priv, sizeof(sysid)); 1755 host = nlm_find_host_by_sysid(sysid); 1756 if (host) { 1757 nlm_host_notify(host, argp->state); 1758 nlm_host_release(host); 1759 } 1760 } 1761 1762 static void 1763 nlm_convert_to_fhandle_t(fhandle_t *fhp, struct netobj *p) 1764 { 1765 memcpy(fhp, p->n_bytes, sizeof(fhandle_t)); 1766 } 1767 1768 struct vfs_state { 1769 struct mount *vs_mp; 1770 struct vnode *vs_vp; 1771 int vs_vfslocked; 1772 int vs_vnlocked; 1773 }; 1774 1775 static int 1776 nlm_get_vfs_state(struct nlm_host *host, struct svc_req *rqstp, 1777 fhandle_t *fhp, struct vfs_state *vs, accmode_t accmode) 1778 { 1779 int error, exflags; 1780 struct ucred *cred = NULL, *credanon = NULL; 1781 1782 memset(vs, 0, sizeof(*vs)); 1783 1784 vs->vs_mp = vfs_getvfs(&fhp->fh_fsid); 1785 if (!vs->vs_mp) { 1786 return (ESTALE); 1787 } 1788 vs->vs_vfslocked = VFS_LOCK_GIANT(vs->vs_mp); 1789 1790 /* accmode == 0 means don't check, since it is an unlock. */ 1791 if (accmode != 0) { 1792 error = VFS_CHECKEXP(vs->vs_mp, 1793 (struct sockaddr *)&host->nh_addr, &exflags, &credanon, 1794 NULL, NULL); 1795 if (error) 1796 goto out; 1797 1798 if (exflags & MNT_EXRDONLY || 1799 (vs->vs_mp->mnt_flag & MNT_RDONLY)) { 1800 error = EROFS; 1801 goto out; 1802 } 1803 } 1804 1805 error = VFS_FHTOVP(vs->vs_mp, &fhp->fh_fid, LK_EXCLUSIVE, &vs->vs_vp); 1806 if (error) 1807 goto out; 1808 vs->vs_vnlocked = TRUE; 1809 1810 if (accmode != 0) { 1811 if (!svc_getcred(rqstp, &cred, NULL)) { 1812 error = EINVAL; 1813 goto out; 1814 } 1815 if (cred->cr_uid == 0 || (exflags & MNT_EXPORTANON)) { 1816 crfree(cred); 1817 cred = credanon; 1818 credanon = NULL; 1819 } 1820 1821 /* 1822 * Check cred. 1823 */ 1824 error = VOP_ACCESS(vs->vs_vp, accmode, cred, curthread); 1825 /* 1826 * If this failed and accmode != VWRITE, try again with 1827 * VWRITE to maintain backwards compatibility with the 1828 * old code that always used VWRITE. 1829 */ 1830 if (error != 0 && accmode != VWRITE) 1831 error = VOP_ACCESS(vs->vs_vp, VWRITE, cred, curthread); 1832 if (error) 1833 goto out; 1834 } 1835 1836 #if __FreeBSD_version < 800011 1837 VOP_UNLOCK(vs->vs_vp, 0, curthread); 1838 #else 1839 VOP_UNLOCK(vs->vs_vp, 0); 1840 #endif 1841 vs->vs_vnlocked = FALSE; 1842 1843 out: 1844 if (cred) 1845 crfree(cred); 1846 if (credanon) 1847 crfree(credanon); 1848 1849 return (error); 1850 } 1851 1852 static void 1853 nlm_release_vfs_state(struct vfs_state *vs) 1854 { 1855 1856 if (vs->vs_vp) { 1857 if (vs->vs_vnlocked) 1858 vput(vs->vs_vp); 1859 else 1860 vrele(vs->vs_vp); 1861 } 1862 if (vs->vs_mp) 1863 vfs_rel(vs->vs_mp); 1864 VFS_UNLOCK_GIANT(vs->vs_vfslocked); 1865 } 1866 1867 static nlm4_stats 1868 nlm_convert_error(int error) 1869 { 1870 1871 if (error == ESTALE) 1872 return nlm4_stale_fh; 1873 else if (error == EROFS) 1874 return nlm4_rofs; 1875 else 1876 return nlm4_failed; 1877 } 1878 1879 int 1880 nlm_do_test(nlm4_testargs *argp, nlm4_testres *result, struct svc_req *rqstp, 1881 CLIENT **rpcp) 1882 { 1883 fhandle_t fh; 1884 struct vfs_state vs; 1885 struct nlm_host *host, *bhost; 1886 int error, sysid; 1887 struct flock fl; 1888 accmode_t accmode; 1889 1890 memset(result, 0, sizeof(*result)); 1891 memset(&vs, 0, sizeof(vs)); 1892 1893 host = nlm_find_host_by_name(argp->alock.caller_name, 1894 svc_getrpccaller(rqstp), rqstp->rq_vers); 1895 if (!host) { 1896 result->stat.stat = nlm4_denied_nolocks; 1897 return (ENOMEM); 1898 } 1899 1900 NLM_DEBUG(3, "nlm_do_test(): caller_name = %s (sysid = %d)\n", 1901 host->nh_caller_name, host->nh_sysid); 1902 1903 nlm_check_expired_locks(host); 1904 sysid = host->nh_sysid; 1905 1906 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 1907 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 1908 1909 if (time_uptime < nlm_grace_threshold) { 1910 result->stat.stat = nlm4_denied_grace_period; 1911 goto out; 1912 } 1913 1914 accmode = argp->exclusive ? VWRITE : VREAD; 1915 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode); 1916 if (error) { 1917 result->stat.stat = nlm_convert_error(error); 1918 goto out; 1919 } 1920 1921 fl.l_start = argp->alock.l_offset; 1922 fl.l_len = argp->alock.l_len; 1923 fl.l_pid = argp->alock.svid; 1924 fl.l_sysid = sysid; 1925 fl.l_whence = SEEK_SET; 1926 if (argp->exclusive) 1927 fl.l_type = F_WRLCK; 1928 else 1929 fl.l_type = F_RDLCK; 1930 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_GETLK, &fl, F_REMOTE); 1931 if (error) { 1932 result->stat.stat = nlm4_failed; 1933 goto out; 1934 } 1935 1936 if (fl.l_type == F_UNLCK) { 1937 result->stat.stat = nlm4_granted; 1938 } else { 1939 result->stat.stat = nlm4_denied; 1940 result->stat.nlm4_testrply_u.holder.exclusive = 1941 (fl.l_type == F_WRLCK); 1942 result->stat.nlm4_testrply_u.holder.svid = fl.l_pid; 1943 bhost = nlm_find_host_by_sysid(fl.l_sysid); 1944 if (bhost) { 1945 /* 1946 * We don't have any useful way of recording 1947 * the value of oh used in the original lock 1948 * request. Ideally, the test reply would have 1949 * a space for the owning host's name allowing 1950 * our caller's NLM to keep track. 1951 * 1952 * As far as I can see, Solaris uses an eight 1953 * byte structure for oh which contains a four 1954 * byte pid encoded in local byte order and 1955 * the first four bytes of the host 1956 * name. Linux uses a variable length string 1957 * 'pid@hostname' in ascii but doesn't even 1958 * return that in test replies. 1959 * 1960 * For the moment, return nothing in oh 1961 * (already zero'ed above). 1962 */ 1963 nlm_host_release(bhost); 1964 } 1965 result->stat.nlm4_testrply_u.holder.l_offset = fl.l_start; 1966 result->stat.nlm4_testrply_u.holder.l_len = fl.l_len; 1967 } 1968 1969 out: 1970 nlm_release_vfs_state(&vs); 1971 if (rpcp) 1972 *rpcp = nlm_host_get_rpc(host, TRUE); 1973 nlm_host_release(host); 1974 return (0); 1975 } 1976 1977 int 1978 nlm_do_lock(nlm4_lockargs *argp, nlm4_res *result, struct svc_req *rqstp, 1979 bool_t monitor, CLIENT **rpcp) 1980 { 1981 fhandle_t fh; 1982 struct vfs_state vs; 1983 struct nlm_host *host; 1984 int error, sysid; 1985 struct flock fl; 1986 accmode_t accmode; 1987 1988 memset(result, 0, sizeof(*result)); 1989 memset(&vs, 0, sizeof(vs)); 1990 1991 host = nlm_find_host_by_name(argp->alock.caller_name, 1992 svc_getrpccaller(rqstp), rqstp->rq_vers); 1993 if (!host) { 1994 result->stat.stat = nlm4_denied_nolocks; 1995 return (ENOMEM); 1996 } 1997 1998 NLM_DEBUG(3, "nlm_do_lock(): caller_name = %s (sysid = %d)\n", 1999 host->nh_caller_name, host->nh_sysid); 2000 2001 if (monitor && host->nh_state && argp->state 2002 && host->nh_state != argp->state) { 2003 /* 2004 * The host rebooted without telling us. Trash its 2005 * locks. 2006 */ 2007 nlm_host_notify(host, argp->state); 2008 } 2009 2010 nlm_check_expired_locks(host); 2011 sysid = host->nh_sysid; 2012 2013 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 2014 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2015 2016 if (time_uptime < nlm_grace_threshold && !argp->reclaim) { 2017 result->stat.stat = nlm4_denied_grace_period; 2018 goto out; 2019 } 2020 2021 accmode = argp->exclusive ? VWRITE : VREAD; 2022 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, accmode); 2023 if (error) { 2024 result->stat.stat = nlm_convert_error(error); 2025 goto out; 2026 } 2027 2028 fl.l_start = argp->alock.l_offset; 2029 fl.l_len = argp->alock.l_len; 2030 fl.l_pid = argp->alock.svid; 2031 fl.l_sysid = sysid; 2032 fl.l_whence = SEEK_SET; 2033 if (argp->exclusive) 2034 fl.l_type = F_WRLCK; 2035 else 2036 fl.l_type = F_RDLCK; 2037 if (argp->block) { 2038 struct nlm_async_lock *af; 2039 CLIENT *client; 2040 struct nlm_grantcookie cookie; 2041 2042 /* 2043 * First, make sure we can contact the host's NLM. 2044 */ 2045 client = nlm_host_get_rpc(host, TRUE); 2046 if (!client) { 2047 result->stat.stat = nlm4_failed; 2048 goto out; 2049 } 2050 2051 /* 2052 * First we need to check and see if there is an 2053 * existing blocked lock that matches. This could be a 2054 * badly behaved client or an RPC re-send. If we find 2055 * one, just return nlm4_blocked. 2056 */ 2057 mtx_lock(&host->nh_lock); 2058 TAILQ_FOREACH(af, &host->nh_pending, af_link) { 2059 if (af->af_fl.l_start == fl.l_start 2060 && af->af_fl.l_len == fl.l_len 2061 && af->af_fl.l_pid == fl.l_pid 2062 && af->af_fl.l_type == fl.l_type) { 2063 break; 2064 } 2065 } 2066 if (!af) { 2067 cookie.ng_sysid = host->nh_sysid; 2068 cookie.ng_cookie = host->nh_grantcookie++; 2069 } 2070 mtx_unlock(&host->nh_lock); 2071 if (af) { 2072 CLNT_RELEASE(client); 2073 result->stat.stat = nlm4_blocked; 2074 goto out; 2075 } 2076 2077 af = malloc(sizeof(struct nlm_async_lock), M_NLM, 2078 M_WAITOK|M_ZERO); 2079 TASK_INIT(&af->af_task, 0, nlm_lock_callback, af); 2080 af->af_vp = vs.vs_vp; 2081 af->af_fl = fl; 2082 af->af_host = host; 2083 af->af_rpc = client; 2084 /* 2085 * We use M_RPC here so that we can xdr_free the thing 2086 * later. 2087 */ 2088 nlm_make_netobj(&af->af_granted.cookie, 2089 (caddr_t)&cookie, sizeof(cookie), M_RPC); 2090 af->af_granted.exclusive = argp->exclusive; 2091 af->af_granted.alock.caller_name = 2092 strdup(argp->alock.caller_name, M_RPC); 2093 nlm_copy_netobj(&af->af_granted.alock.fh, 2094 &argp->alock.fh, M_RPC); 2095 nlm_copy_netobj(&af->af_granted.alock.oh, 2096 &argp->alock.oh, M_RPC); 2097 af->af_granted.alock.svid = argp->alock.svid; 2098 af->af_granted.alock.l_offset = argp->alock.l_offset; 2099 af->af_granted.alock.l_len = argp->alock.l_len; 2100 2101 /* 2102 * Put the entry on the pending list before calling 2103 * VOP_ADVLOCKASYNC. We do this in case the lock 2104 * request was blocked (returning EINPROGRESS) but 2105 * then granted before we manage to run again. The 2106 * client may receive the granted message before we 2107 * send our blocked reply but thats their problem. 2108 */ 2109 mtx_lock(&host->nh_lock); 2110 TAILQ_INSERT_TAIL(&host->nh_pending, af, af_link); 2111 mtx_unlock(&host->nh_lock); 2112 2113 error = VOP_ADVLOCKASYNC(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE, 2114 &af->af_task, &af->af_cookie); 2115 2116 /* 2117 * If the lock completed synchronously, just free the 2118 * tracking structure now. 2119 */ 2120 if (error != EINPROGRESS) { 2121 CLNT_RELEASE(af->af_rpc); 2122 mtx_lock(&host->nh_lock); 2123 TAILQ_REMOVE(&host->nh_pending, af, af_link); 2124 mtx_unlock(&host->nh_lock); 2125 xdr_free((xdrproc_t) xdr_nlm4_testargs, 2126 &af->af_granted); 2127 free(af, M_NLM); 2128 } else { 2129 NLM_DEBUG(2, "NLM: pending async lock %p for %s " 2130 "(sysid %d)\n", af, host->nh_caller_name, sysid); 2131 /* 2132 * Don't vrele the vnode just yet - this must 2133 * wait until either the async callback 2134 * happens or the lock is cancelled. 2135 */ 2136 vs.vs_vp = NULL; 2137 } 2138 } else { 2139 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_SETLK, &fl, F_REMOTE); 2140 } 2141 2142 if (error) { 2143 if (error == EINPROGRESS) { 2144 result->stat.stat = nlm4_blocked; 2145 } else if (error == EDEADLK) { 2146 result->stat.stat = nlm4_deadlck; 2147 } else if (error == EAGAIN) { 2148 result->stat.stat = nlm4_denied; 2149 } else { 2150 result->stat.stat = nlm4_failed; 2151 } 2152 } else { 2153 if (monitor) 2154 nlm_host_monitor(host, argp->state); 2155 result->stat.stat = nlm4_granted; 2156 } 2157 2158 out: 2159 nlm_release_vfs_state(&vs); 2160 if (rpcp) 2161 *rpcp = nlm_host_get_rpc(host, TRUE); 2162 nlm_host_release(host); 2163 return (0); 2164 } 2165 2166 int 2167 nlm_do_cancel(nlm4_cancargs *argp, nlm4_res *result, struct svc_req *rqstp, 2168 CLIENT **rpcp) 2169 { 2170 fhandle_t fh; 2171 struct vfs_state vs; 2172 struct nlm_host *host; 2173 int error, sysid; 2174 struct flock fl; 2175 struct nlm_async_lock *af; 2176 2177 memset(result, 0, sizeof(*result)); 2178 memset(&vs, 0, sizeof(vs)); 2179 2180 host = nlm_find_host_by_name(argp->alock.caller_name, 2181 svc_getrpccaller(rqstp), rqstp->rq_vers); 2182 if (!host) { 2183 result->stat.stat = nlm4_denied_nolocks; 2184 return (ENOMEM); 2185 } 2186 2187 NLM_DEBUG(3, "nlm_do_cancel(): caller_name = %s (sysid = %d)\n", 2188 host->nh_caller_name, host->nh_sysid); 2189 2190 nlm_check_expired_locks(host); 2191 sysid = host->nh_sysid; 2192 2193 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 2194 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2195 2196 if (time_uptime < nlm_grace_threshold) { 2197 result->stat.stat = nlm4_denied_grace_period; 2198 goto out; 2199 } 2200 2201 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0); 2202 if (error) { 2203 result->stat.stat = nlm_convert_error(error); 2204 goto out; 2205 } 2206 2207 fl.l_start = argp->alock.l_offset; 2208 fl.l_len = argp->alock.l_len; 2209 fl.l_pid = argp->alock.svid; 2210 fl.l_sysid = sysid; 2211 fl.l_whence = SEEK_SET; 2212 if (argp->exclusive) 2213 fl.l_type = F_WRLCK; 2214 else 2215 fl.l_type = F_RDLCK; 2216 2217 /* 2218 * First we need to try and find the async lock request - if 2219 * there isn't one, we give up and return nlm4_denied. 2220 */ 2221 mtx_lock(&host->nh_lock); 2222 2223 TAILQ_FOREACH(af, &host->nh_pending, af_link) { 2224 if (af->af_fl.l_start == fl.l_start 2225 && af->af_fl.l_len == fl.l_len 2226 && af->af_fl.l_pid == fl.l_pid 2227 && af->af_fl.l_type == fl.l_type) { 2228 break; 2229 } 2230 } 2231 2232 if (!af) { 2233 mtx_unlock(&host->nh_lock); 2234 result->stat.stat = nlm4_denied; 2235 goto out; 2236 } 2237 2238 error = nlm_cancel_async_lock(af); 2239 2240 if (error) { 2241 result->stat.stat = nlm4_denied; 2242 } else { 2243 result->stat.stat = nlm4_granted; 2244 } 2245 2246 mtx_unlock(&host->nh_lock); 2247 2248 out: 2249 nlm_release_vfs_state(&vs); 2250 if (rpcp) 2251 *rpcp = nlm_host_get_rpc(host, TRUE); 2252 nlm_host_release(host); 2253 return (0); 2254 } 2255 2256 int 2257 nlm_do_unlock(nlm4_unlockargs *argp, nlm4_res *result, struct svc_req *rqstp, 2258 CLIENT **rpcp) 2259 { 2260 fhandle_t fh; 2261 struct vfs_state vs; 2262 struct nlm_host *host; 2263 int error, sysid; 2264 struct flock fl; 2265 2266 memset(result, 0, sizeof(*result)); 2267 memset(&vs, 0, sizeof(vs)); 2268 2269 host = nlm_find_host_by_name(argp->alock.caller_name, 2270 svc_getrpccaller(rqstp), rqstp->rq_vers); 2271 if (!host) { 2272 result->stat.stat = nlm4_denied_nolocks; 2273 return (ENOMEM); 2274 } 2275 2276 NLM_DEBUG(3, "nlm_do_unlock(): caller_name = %s (sysid = %d)\n", 2277 host->nh_caller_name, host->nh_sysid); 2278 2279 nlm_check_expired_locks(host); 2280 sysid = host->nh_sysid; 2281 2282 nlm_convert_to_fhandle_t(&fh, &argp->alock.fh); 2283 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2284 2285 if (time_uptime < nlm_grace_threshold) { 2286 result->stat.stat = nlm4_denied_grace_period; 2287 goto out; 2288 } 2289 2290 error = nlm_get_vfs_state(host, rqstp, &fh, &vs, (accmode_t)0); 2291 if (error) { 2292 result->stat.stat = nlm_convert_error(error); 2293 goto out; 2294 } 2295 2296 fl.l_start = argp->alock.l_offset; 2297 fl.l_len = argp->alock.l_len; 2298 fl.l_pid = argp->alock.svid; 2299 fl.l_sysid = sysid; 2300 fl.l_whence = SEEK_SET; 2301 fl.l_type = F_UNLCK; 2302 error = VOP_ADVLOCK(vs.vs_vp, NULL, F_UNLCK, &fl, F_REMOTE); 2303 2304 /* 2305 * Ignore the error - there is no result code for failure, 2306 * only for grace period. 2307 */ 2308 result->stat.stat = nlm4_granted; 2309 2310 out: 2311 nlm_release_vfs_state(&vs); 2312 if (rpcp) 2313 *rpcp = nlm_host_get_rpc(host, TRUE); 2314 nlm_host_release(host); 2315 return (0); 2316 } 2317 2318 int 2319 nlm_do_granted(nlm4_testargs *argp, nlm4_res *result, struct svc_req *rqstp, 2320 2321 CLIENT **rpcp) 2322 { 2323 struct nlm_host *host; 2324 struct nlm_waiting_lock *nw; 2325 2326 memset(result, 0, sizeof(*result)); 2327 2328 host = nlm_find_host_by_addr(svc_getrpccaller(rqstp), rqstp->rq_vers); 2329 if (!host) { 2330 result->stat.stat = nlm4_denied_nolocks; 2331 return (ENOMEM); 2332 } 2333 2334 nlm_copy_netobj(&result->cookie, &argp->cookie, M_RPC); 2335 result->stat.stat = nlm4_denied; 2336 KFAIL_POINT_CODE(DEBUG_FP, nlm_deny_grant, goto out); 2337 2338 mtx_lock(&nlm_global_lock); 2339 TAILQ_FOREACH(nw, &nlm_waiting_locks, nw_link) { 2340 if (!nw->nw_waiting) 2341 continue; 2342 if (argp->alock.svid == nw->nw_lock.svid 2343 && argp->alock.l_offset == nw->nw_lock.l_offset 2344 && argp->alock.l_len == nw->nw_lock.l_len 2345 && argp->alock.fh.n_len == nw->nw_lock.fh.n_len 2346 && !memcmp(argp->alock.fh.n_bytes, nw->nw_lock.fh.n_bytes, 2347 nw->nw_lock.fh.n_len)) { 2348 nw->nw_waiting = FALSE; 2349 wakeup(nw); 2350 result->stat.stat = nlm4_granted; 2351 break; 2352 } 2353 } 2354 mtx_unlock(&nlm_global_lock); 2355 2356 out: 2357 if (rpcp) 2358 *rpcp = nlm_host_get_rpc(host, TRUE); 2359 nlm_host_release(host); 2360 return (0); 2361 } 2362 2363 void 2364 nlm_do_granted_res(nlm4_res *argp, struct svc_req *rqstp) 2365 { 2366 struct nlm_host *host = NULL; 2367 struct nlm_async_lock *af = NULL; 2368 int error; 2369 2370 if (argp->cookie.n_len != sizeof(struct nlm_grantcookie)) { 2371 NLM_DEBUG(1, "NLM: bogus grant cookie"); 2372 goto out; 2373 } 2374 2375 host = nlm_find_host_by_sysid(ng_sysid(&argp->cookie)); 2376 if (!host) { 2377 NLM_DEBUG(1, "NLM: Unknown host rejected our grant"); 2378 goto out; 2379 } 2380 2381 mtx_lock(&host->nh_lock); 2382 TAILQ_FOREACH(af, &host->nh_granted, af_link) 2383 if (ng_cookie(&argp->cookie) == 2384 ng_cookie(&af->af_granted.cookie)) 2385 break; 2386 if (af) 2387 TAILQ_REMOVE(&host->nh_granted, af, af_link); 2388 mtx_unlock(&host->nh_lock); 2389 2390 if (!af) { 2391 NLM_DEBUG(1, "NLM: host %s (sysid %d) replied to our grant " 2392 "with unrecognized cookie %d:%d", host->nh_caller_name, 2393 host->nh_sysid, ng_sysid(&argp->cookie), 2394 ng_cookie(&argp->cookie)); 2395 goto out; 2396 } 2397 2398 if (argp->stat.stat != nlm4_granted) { 2399 af->af_fl.l_type = F_UNLCK; 2400 error = VOP_ADVLOCK(af->af_vp, NULL, F_UNLCK, &af->af_fl, F_REMOTE); 2401 if (error) { 2402 NLM_DEBUG(1, "NLM: host %s (sysid %d) rejected our grant " 2403 "and we failed to unlock (%d)", host->nh_caller_name, 2404 host->nh_sysid, error); 2405 goto out; 2406 } 2407 2408 NLM_DEBUG(5, "NLM: async lock %p rejected by host %s (sysid %d)", 2409 af, host->nh_caller_name, host->nh_sysid); 2410 } else { 2411 NLM_DEBUG(5, "NLM: async lock %p accepted by host %s (sysid %d)", 2412 af, host->nh_caller_name, host->nh_sysid); 2413 } 2414 2415 out: 2416 if (af) 2417 nlm_free_async_lock(af); 2418 if (host) 2419 nlm_host_release(host); 2420 } 2421 2422 void 2423 nlm_do_free_all(nlm4_notify *argp) 2424 { 2425 struct nlm_host *host, *thost; 2426 2427 TAILQ_FOREACH_SAFE(host, &nlm_hosts, nh_link, thost) { 2428 if (!strcmp(host->nh_caller_name, argp->name)) 2429 nlm_host_notify(host, argp->state); 2430 } 2431 } 2432 2433 /* 2434 * Kernel module glue 2435 */ 2436 static int 2437 nfslockd_modevent(module_t mod, int type, void *data) 2438 { 2439 2440 return (0); 2441 } 2442 static moduledata_t nfslockd_mod = { 2443 "nfslockd", 2444 nfslockd_modevent, 2445 NULL, 2446 }; 2447 DECLARE_MODULE(nfslockd, nfslockd_mod, SI_SUB_VFS, SI_ORDER_ANY); 2448 2449 /* So that loader and kldload(2) can find us, wherever we are.. */ 2450 MODULE_DEPEND(nfslockd, krpc, 1, 1, 1); 2451 MODULE_DEPEND(nfslockd, nfslock, 1, 1, 1); 2452 MODULE_VERSION(nfslockd, 1);
Cache object: 6bd64dd12cc5a252661e331f3e7aad6d
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