1 /* 2 * linux/fs/lockd/svc.c 3 * 4 * This is the central lockd service. 5 * 6 * FIXME: Separate the lockd NFS server functionality from the lockd NFS 7 * client functionality. Oh why didn't Sun create two separate 8 * services in the first place? 9 * 10 * Authors: Olaf Kirch (okir@monad.swb.de) 11 * 12 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 13 */ 14 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/sysctl.h> 18 #include <linux/moduleparam.h> 19 20 #include <linux/sched/signal.h> 21 #include <linux/errno.h> 22 #include <linux/in.h> 23 #include <linux/uio.h> 24 #include <linux/smp.h> 25 #include <linux/mutex.h> 26 #include <linux/kthread.h> 27 #include <linux/freezer.h> 28 #include <linux/inetdevice.h> 29 30 #include <linux/sunrpc/types.h> 31 #include <linux/sunrpc/stats.h> 32 #include <linux/sunrpc/clnt.h> 33 #include <linux/sunrpc/svc.h> 34 #include <linux/sunrpc/svcsock.h> 35 #include <linux/sunrpc/svc_xprt.h> 36 #include <net/ip.h> 37 #include <net/addrconf.h> 38 #include <net/ipv6.h> 39 #include <linux/lockd/lockd.h> 40 #include <linux/nfs.h> 41 42 #include "netns.h" 43 #include "procfs.h" 44 45 #define NLMDBG_FACILITY NLMDBG_SVC 46 #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) 47 #define ALLOWED_SIGS (sigmask(SIGKILL)) 48 49 static struct svc_program nlmsvc_program; 50 51 const struct nlmsvc_binding *nlmsvc_ops; 52 EXPORT_SYMBOL_GPL(nlmsvc_ops); 53 54 static DEFINE_MUTEX(nlmsvc_mutex); 55 static unsigned int nlmsvc_users; 56 static struct task_struct *nlmsvc_task; 57 static struct svc_rqst *nlmsvc_rqst; 58 unsigned long nlmsvc_timeout; 59 60 atomic_t nlm_ntf_refcnt = ATOMIC_INIT(0); 61 DECLARE_WAIT_QUEUE_HEAD(nlm_ntf_wq); 62 63 unsigned int lockd_net_id; 64 65 /* 66 * These can be set at insmod time (useful for NFS as root filesystem), 67 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 68 */ 69 static unsigned long nlm_grace_period; 70 static unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; 71 static int nlm_udpport, nlm_tcpport; 72 73 /* RLIM_NOFILE defaults to 1024. That seems like a reasonable default here. */ 74 static unsigned int nlm_max_connections = 1024; 75 76 /* 77 * Constants needed for the sysctl interface. 78 */ 79 static const unsigned long nlm_grace_period_min = 0; 80 static const unsigned long nlm_grace_period_max = 240; 81 static const unsigned long nlm_timeout_min = 3; 82 static const unsigned long nlm_timeout_max = 20; 83 static const int nlm_port_min = 0, nlm_port_max = 65535; 84 85 #ifdef CONFIG_SYSCTL 86 static struct ctl_table_header * nlm_sysctl_table; 87 #endif 88 89 static unsigned long get_lockd_grace_period(void) 90 { 91 /* Note: nlm_timeout should always be nonzero */ 92 if (nlm_grace_period) 93 return roundup(nlm_grace_period, nlm_timeout) * HZ; 94 else 95 return nlm_timeout * 5 * HZ; 96 } 97 98 static void grace_ender(struct work_struct *grace) 99 { 100 struct delayed_work *dwork = to_delayed_work(grace); 101 struct lockd_net *ln = container_of(dwork, struct lockd_net, 102 grace_period_end); 103 104 locks_end_grace(&ln->lockd_manager); 105 } 106 107 static void set_grace_period(struct net *net) 108 { 109 unsigned long grace_period = get_lockd_grace_period(); 110 struct lockd_net *ln = net_generic(net, lockd_net_id); 111 112 locks_start_grace(net, &ln->lockd_manager); 113 cancel_delayed_work_sync(&ln->grace_period_end); 114 schedule_delayed_work(&ln->grace_period_end, grace_period); 115 } 116 117 static void restart_grace(void) 118 { 119 if (nlmsvc_ops) { 120 struct net *net = &init_net; 121 struct lockd_net *ln = net_generic(net, lockd_net_id); 122 123 cancel_delayed_work_sync(&ln->grace_period_end); 124 locks_end_grace(&ln->lockd_manager); 125 nlmsvc_invalidate_all(); 126 set_grace_period(net); 127 } 128 } 129 130 /* 131 * This is the lockd kernel thread 132 */ 133 static int 134 lockd(void *vrqstp) 135 { 136 int err = 0; 137 struct svc_rqst *rqstp = vrqstp; 138 struct net *net = &init_net; 139 struct lockd_net *ln = net_generic(net, lockd_net_id); 140 141 /* try_to_freeze() is called from svc_recv() */ 142 set_freezable(); 143 144 /* Allow SIGKILL to tell lockd to drop all of its locks */ 145 allow_signal(SIGKILL); 146 147 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); 148 149 /* 150 * The main request loop. We don't terminate until the last 151 * NFS mount or NFS daemon has gone away. 152 */ 153 while (!kthread_should_stop()) { 154 long timeout = MAX_SCHEDULE_TIMEOUT; 155 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); 156 157 /* update sv_maxconn if it has changed */ 158 rqstp->rq_server->sv_maxconn = nlm_max_connections; 159 160 if (signalled()) { 161 flush_signals(current); 162 restart_grace(); 163 continue; 164 } 165 166 timeout = nlmsvc_retry_blocked(); 167 168 /* 169 * Find a socket with data available and call its 170 * recvfrom routine. 171 */ 172 err = svc_recv(rqstp, timeout); 173 if (err == -EAGAIN || err == -EINTR) 174 continue; 175 dprintk("lockd: request from %s\n", 176 svc_print_addr(rqstp, buf, sizeof(buf))); 177 178 svc_process(rqstp); 179 } 180 flush_signals(current); 181 if (nlmsvc_ops) 182 nlmsvc_invalidate_all(); 183 nlm_shutdown_hosts(); 184 cancel_delayed_work_sync(&ln->grace_period_end); 185 locks_end_grace(&ln->lockd_manager); 186 return 0; 187 } 188 189 static int create_lockd_listener(struct svc_serv *serv, const char *name, 190 struct net *net, const int family, 191 const unsigned short port) 192 { 193 struct svc_xprt *xprt; 194 195 xprt = svc_find_xprt(serv, name, net, family, 0); 196 if (xprt == NULL) 197 return svc_create_xprt(serv, name, net, family, port, 198 SVC_SOCK_DEFAULTS); 199 svc_xprt_put(xprt); 200 return 0; 201 } 202 203 static int create_lockd_family(struct svc_serv *serv, struct net *net, 204 const int family) 205 { 206 int err; 207 208 err = create_lockd_listener(serv, "udp", net, family, nlm_udpport); 209 if (err < 0) 210 return err; 211 212 return create_lockd_listener(serv, "tcp", net, family, nlm_tcpport); 213 } 214 215 /* 216 * Ensure there are active UDP and TCP listeners for lockd. 217 * 218 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some 219 * local services (such as rpc.statd) still require UDP, and 220 * some NFS servers do not yet support NLM over TCP. 221 * 222 * Returns zero if all listeners are available; otherwise a 223 * negative errno value is returned. 224 */ 225 static int make_socks(struct svc_serv *serv, struct net *net) 226 { 227 static int warned; 228 int err; 229 230 err = create_lockd_family(serv, net, PF_INET); 231 if (err < 0) 232 goto out_err; 233 234 err = create_lockd_family(serv, net, PF_INET6); 235 if (err < 0 && err != -EAFNOSUPPORT) 236 goto out_err; 237 238 warned = 0; 239 return 0; 240 241 out_err: 242 if (warned++ == 0) 243 printk(KERN_WARNING 244 "lockd_up: makesock failed, error=%d\n", err); 245 svc_shutdown_net(serv, net); 246 return err; 247 } 248 249 static int lockd_up_net(struct svc_serv *serv, struct net *net) 250 { 251 struct lockd_net *ln = net_generic(net, lockd_net_id); 252 int error; 253 254 if (ln->nlmsvc_users++) 255 return 0; 256 257 error = svc_bind(serv, net); 258 if (error) 259 goto err_bind; 260 261 error = make_socks(serv, net); 262 if (error < 0) 263 goto err_bind; 264 set_grace_period(net); 265 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum); 266 return 0; 267 268 err_bind: 269 ln->nlmsvc_users--; 270 return error; 271 } 272 273 static void lockd_down_net(struct svc_serv *serv, struct net *net) 274 { 275 struct lockd_net *ln = net_generic(net, lockd_net_id); 276 277 if (ln->nlmsvc_users) { 278 if (--ln->nlmsvc_users == 0) { 279 nlm_shutdown_hosts_net(net); 280 cancel_delayed_work_sync(&ln->grace_period_end); 281 locks_end_grace(&ln->lockd_manager); 282 svc_shutdown_net(serv, net); 283 dprintk("%s: per-net data destroyed; net=%x\n", 284 __func__, net->ns.inum); 285 } 286 } else { 287 pr_err("%s: no users! task=%p, net=%x\n", 288 __func__, nlmsvc_task, net->ns.inum); 289 BUG(); 290 } 291 } 292 293 static int lockd_inetaddr_event(struct notifier_block *this, 294 unsigned long event, void *ptr) 295 { 296 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 297 struct sockaddr_in sin; 298 299 if ((event != NETDEV_DOWN) || 300 !atomic_inc_not_zero(&nlm_ntf_refcnt)) 301 goto out; 302 303 if (nlmsvc_rqst) { 304 dprintk("lockd_inetaddr_event: removed %pI4\n", 305 &ifa->ifa_local); 306 sin.sin_family = AF_INET; 307 sin.sin_addr.s_addr = ifa->ifa_local; 308 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, 309 (struct sockaddr *)&sin); 310 } 311 atomic_dec(&nlm_ntf_refcnt); 312 wake_up(&nlm_ntf_wq); 313 314 out: 315 return NOTIFY_DONE; 316 } 317 318 static struct notifier_block lockd_inetaddr_notifier = { 319 .notifier_call = lockd_inetaddr_event, 320 }; 321 322 #if IS_ENABLED(CONFIG_IPV6) 323 static int lockd_inet6addr_event(struct notifier_block *this, 324 unsigned long event, void *ptr) 325 { 326 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 327 struct sockaddr_in6 sin6; 328 329 if ((event != NETDEV_DOWN) || 330 !atomic_inc_not_zero(&nlm_ntf_refcnt)) 331 goto out; 332 333 if (nlmsvc_rqst) { 334 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr); 335 sin6.sin6_family = AF_INET6; 336 sin6.sin6_addr = ifa->addr; 337 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 338 sin6.sin6_scope_id = ifa->idev->dev->ifindex; 339 svc_age_temp_xprts_now(nlmsvc_rqst->rq_server, 340 (struct sockaddr *)&sin6); 341 } 342 atomic_dec(&nlm_ntf_refcnt); 343 wake_up(&nlm_ntf_wq); 344 345 out: 346 return NOTIFY_DONE; 347 } 348 349 static struct notifier_block lockd_inet6addr_notifier = { 350 .notifier_call = lockd_inet6addr_event, 351 }; 352 #endif 353 354 static void lockd_unregister_notifiers(void) 355 { 356 unregister_inetaddr_notifier(&lockd_inetaddr_notifier); 357 #if IS_ENABLED(CONFIG_IPV6) 358 unregister_inet6addr_notifier(&lockd_inet6addr_notifier); 359 #endif 360 wait_event(nlm_ntf_wq, atomic_read(&nlm_ntf_refcnt) == 0); 361 } 362 363 static void lockd_svc_exit_thread(void) 364 { 365 atomic_dec(&nlm_ntf_refcnt); 366 lockd_unregister_notifiers(); 367 svc_exit_thread(nlmsvc_rqst); 368 } 369 370 static int lockd_start_svc(struct svc_serv *serv) 371 { 372 int error; 373 374 if (nlmsvc_rqst) 375 return 0; 376 377 /* 378 * Create the kernel thread and wait for it to start. 379 */ 380 nlmsvc_rqst = svc_prepare_thread(serv, &serv->sv_pools[0], NUMA_NO_NODE); 381 if (IS_ERR(nlmsvc_rqst)) { 382 error = PTR_ERR(nlmsvc_rqst); 383 printk(KERN_WARNING 384 "lockd_up: svc_rqst allocation failed, error=%d\n", 385 error); 386 lockd_unregister_notifiers(); 387 goto out_rqst; 388 } 389 390 atomic_inc(&nlm_ntf_refcnt); 391 svc_sock_update_bufs(serv); 392 serv->sv_maxconn = nlm_max_connections; 393 394 nlmsvc_task = kthread_create(lockd, nlmsvc_rqst, "%s", serv->sv_name); 395 if (IS_ERR(nlmsvc_task)) { 396 error = PTR_ERR(nlmsvc_task); 397 printk(KERN_WARNING 398 "lockd_up: kthread_run failed, error=%d\n", error); 399 goto out_task; 400 } 401 nlmsvc_rqst->rq_task = nlmsvc_task; 402 wake_up_process(nlmsvc_task); 403 404 dprintk("lockd_up: service started\n"); 405 return 0; 406 407 out_task: 408 lockd_svc_exit_thread(); 409 nlmsvc_task = NULL; 410 out_rqst: 411 nlmsvc_rqst = NULL; 412 return error; 413 } 414 415 static const struct svc_serv_ops lockd_sv_ops = { 416 .svo_shutdown = svc_rpcb_cleanup, 417 .svo_enqueue_xprt = svc_xprt_do_enqueue, 418 }; 419 420 static struct svc_serv *lockd_create_svc(void) 421 { 422 struct svc_serv *serv; 423 424 /* 425 * Check whether we're already up and running. 426 */ 427 if (nlmsvc_rqst) { 428 /* 429 * Note: increase service usage, because later in case of error 430 * svc_destroy() will be called. 431 */ 432 svc_get(nlmsvc_rqst->rq_server); 433 return nlmsvc_rqst->rq_server; 434 } 435 436 /* 437 * Sanity check: if there's no pid, 438 * we should be the first user ... 439 */ 440 if (nlmsvc_users) 441 printk(KERN_WARNING 442 "lockd_up: no pid, %d users??\n", nlmsvc_users); 443 444 if (!nlm_timeout) 445 nlm_timeout = LOCKD_DFLT_TIMEO; 446 nlmsvc_timeout = nlm_timeout * HZ; 447 448 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, &lockd_sv_ops); 449 if (!serv) { 450 printk(KERN_WARNING "lockd_up: create service failed\n"); 451 return ERR_PTR(-ENOMEM); 452 } 453 register_inetaddr_notifier(&lockd_inetaddr_notifier); 454 #if IS_ENABLED(CONFIG_IPV6) 455 register_inet6addr_notifier(&lockd_inet6addr_notifier); 456 #endif 457 dprintk("lockd_up: service created\n"); 458 return serv; 459 } 460 461 /* 462 * Bring up the lockd process if it's not already up. 463 */ 464 int lockd_up(struct net *net) 465 { 466 struct svc_serv *serv; 467 int error; 468 469 mutex_lock(&nlmsvc_mutex); 470 471 serv = lockd_create_svc(); 472 if (IS_ERR(serv)) { 473 error = PTR_ERR(serv); 474 goto err_create; 475 } 476 477 error = lockd_up_net(serv, net); 478 if (error < 0) { 479 lockd_unregister_notifiers(); 480 goto err_put; 481 } 482 483 error = lockd_start_svc(serv); 484 if (error < 0) { 485 lockd_down_net(serv, net); 486 goto err_put; 487 } 488 nlmsvc_users++; 489 /* 490 * Note: svc_serv structures have an initial use count of 1, 491 * so we exit through here on both success and failure. 492 */ 493 err_put: 494 svc_destroy(serv); 495 err_create: 496 mutex_unlock(&nlmsvc_mutex); 497 return error; 498 } 499 EXPORT_SYMBOL_GPL(lockd_up); 500 501 /* 502 * Decrement the user count and bring down lockd if we're the last. 503 */ 504 void 505 lockd_down(struct net *net) 506 { 507 mutex_lock(&nlmsvc_mutex); 508 lockd_down_net(nlmsvc_rqst->rq_server, net); 509 if (nlmsvc_users) { 510 if (--nlmsvc_users) 511 goto out; 512 } else { 513 printk(KERN_ERR "lockd_down: no users! task=%p\n", 514 nlmsvc_task); 515 BUG(); 516 } 517 518 if (!nlmsvc_task) { 519 printk(KERN_ERR "lockd_down: no lockd running.\n"); 520 BUG(); 521 } 522 kthread_stop(nlmsvc_task); 523 dprintk("lockd_down: service stopped\n"); 524 lockd_svc_exit_thread(); 525 dprintk("lockd_down: service destroyed\n"); 526 nlmsvc_task = NULL; 527 nlmsvc_rqst = NULL; 528 out: 529 mutex_unlock(&nlmsvc_mutex); 530 } 531 EXPORT_SYMBOL_GPL(lockd_down); 532 533 #ifdef CONFIG_SYSCTL 534 535 /* 536 * Sysctl parameters (same as module parameters, different interface). 537 */ 538 539 static struct ctl_table nlm_sysctls[] = { 540 { 541 .procname = "nlm_grace_period", 542 .data = &nlm_grace_period, 543 .maxlen = sizeof(unsigned long), 544 .mode = 0644, 545 .proc_handler = proc_doulongvec_minmax, 546 .extra1 = (unsigned long *) &nlm_grace_period_min, 547 .extra2 = (unsigned long *) &nlm_grace_period_max, 548 }, 549 { 550 .procname = "nlm_timeout", 551 .data = &nlm_timeout, 552 .maxlen = sizeof(unsigned long), 553 .mode = 0644, 554 .proc_handler = proc_doulongvec_minmax, 555 .extra1 = (unsigned long *) &nlm_timeout_min, 556 .extra2 = (unsigned long *) &nlm_timeout_max, 557 }, 558 { 559 .procname = "nlm_udpport", 560 .data = &nlm_udpport, 561 .maxlen = sizeof(int), 562 .mode = 0644, 563 .proc_handler = proc_dointvec_minmax, 564 .extra1 = (int *) &nlm_port_min, 565 .extra2 = (int *) &nlm_port_max, 566 }, 567 { 568 .procname = "nlm_tcpport", 569 .data = &nlm_tcpport, 570 .maxlen = sizeof(int), 571 .mode = 0644, 572 .proc_handler = proc_dointvec_minmax, 573 .extra1 = (int *) &nlm_port_min, 574 .extra2 = (int *) &nlm_port_max, 575 }, 576 { 577 .procname = "nsm_use_hostnames", 578 .data = &nsm_use_hostnames, 579 .maxlen = sizeof(int), 580 .mode = 0644, 581 .proc_handler = proc_dointvec, 582 }, 583 { 584 .procname = "nsm_local_state", 585 .data = &nsm_local_state, 586 .maxlen = sizeof(int), 587 .mode = 0644, 588 .proc_handler = proc_dointvec, 589 }, 590 { } 591 }; 592 593 static struct ctl_table nlm_sysctl_dir[] = { 594 { 595 .procname = "nfs", 596 .mode = 0555, 597 .child = nlm_sysctls, 598 }, 599 { } 600 }; 601 602 static struct ctl_table nlm_sysctl_root[] = { 603 { 604 .procname = "fs", 605 .mode = 0555, 606 .child = nlm_sysctl_dir, 607 }, 608 { } 609 }; 610 611 #endif /* CONFIG_SYSCTL */ 612 613 /* 614 * Module (and sysfs) parameters. 615 */ 616 617 #define param_set_min_max(name, type, which_strtol, min, max) \ 618 static int param_set_##name(const char *val, const struct kernel_param *kp) \ 619 { \ 620 char *endp; \ 621 __typeof__(type) num = which_strtol(val, &endp, 0); \ 622 if (endp == val || *endp || num < (min) || num > (max)) \ 623 return -EINVAL; \ 624 *((type *) kp->arg) = num; \ 625 return 0; \ 626 } 627 628 static inline int is_callback(u32 proc) 629 { 630 return proc == NLMPROC_GRANTED 631 || proc == NLMPROC_GRANTED_MSG 632 || proc == NLMPROC_TEST_RES 633 || proc == NLMPROC_LOCK_RES 634 || proc == NLMPROC_CANCEL_RES 635 || proc == NLMPROC_UNLOCK_RES 636 || proc == NLMPROC_NSM_NOTIFY; 637 } 638 639 640 static int lockd_authenticate(struct svc_rqst *rqstp) 641 { 642 rqstp->rq_client = NULL; 643 switch (rqstp->rq_authop->flavour) { 644 case RPC_AUTH_NULL: 645 case RPC_AUTH_UNIX: 646 if (rqstp->rq_proc == 0) 647 return SVC_OK; 648 if (is_callback(rqstp->rq_proc)) { 649 /* Leave it to individual procedures to 650 * call nlmsvc_lookup_host(rqstp) 651 */ 652 return SVC_OK; 653 } 654 return svc_set_client(rqstp); 655 } 656 return SVC_DENIED; 657 } 658 659 660 param_set_min_max(port, int, simple_strtol, 0, 65535) 661 param_set_min_max(grace_period, unsigned long, simple_strtoul, 662 nlm_grace_period_min, nlm_grace_period_max) 663 param_set_min_max(timeout, unsigned long, simple_strtoul, 664 nlm_timeout_min, nlm_timeout_max) 665 666 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 667 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION "."); 668 MODULE_LICENSE("GPL"); 669 670 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong, 671 &nlm_grace_period, 0644); 672 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong, 673 &nlm_timeout, 0644); 674 module_param_call(nlm_udpport, param_set_port, param_get_int, 675 &nlm_udpport, 0644); 676 module_param_call(nlm_tcpport, param_set_port, param_get_int, 677 &nlm_tcpport, 0644); 678 module_param(nsm_use_hostnames, bool, 0644); 679 module_param(nlm_max_connections, uint, 0644); 680 681 static int lockd_init_net(struct net *net) 682 { 683 struct lockd_net *ln = net_generic(net, lockd_net_id); 684 685 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender); 686 INIT_LIST_HEAD(&ln->lockd_manager.list); 687 ln->lockd_manager.block_opens = false; 688 INIT_LIST_HEAD(&ln->nsm_handles); 689 return 0; 690 } 691 692 static void lockd_exit_net(struct net *net) 693 { 694 struct lockd_net *ln = net_generic(net, lockd_net_id); 695 696 WARN_ONCE(!list_empty(&ln->lockd_manager.list), 697 "net %x %s: lockd_manager.list is not empty\n", 698 net->ns.inum, __func__); 699 WARN_ONCE(!list_empty(&ln->nsm_handles), 700 "net %x %s: nsm_handles list is not empty\n", 701 net->ns.inum, __func__); 702 WARN_ONCE(delayed_work_pending(&ln->grace_period_end), 703 "net %x %s: grace_period_end was not cancelled\n", 704 net->ns.inum, __func__); 705 } 706 707 static struct pernet_operations lockd_net_ops = { 708 .init = lockd_init_net, 709 .exit = lockd_exit_net, 710 .id = &lockd_net_id, 711 .size = sizeof(struct lockd_net), 712 }; 713 714 715 /* 716 * Initialising and terminating the module. 717 */ 718 719 static int __init init_nlm(void) 720 { 721 int err; 722 723 #ifdef CONFIG_SYSCTL 724 err = -ENOMEM; 725 nlm_sysctl_table = register_sysctl_table(nlm_sysctl_root); 726 if (nlm_sysctl_table == NULL) 727 goto err_sysctl; 728 #endif 729 err = register_pernet_subsys(&lockd_net_ops); 730 if (err) 731 goto err_pernet; 732 733 err = lockd_create_procfs(); 734 if (err) 735 goto err_procfs; 736 737 return 0; 738 739 err_procfs: 740 unregister_pernet_subsys(&lockd_net_ops); 741 err_pernet: 742 #ifdef CONFIG_SYSCTL 743 unregister_sysctl_table(nlm_sysctl_table); 744 err_sysctl: 745 #endif 746 return err; 747 } 748 749 static void __exit exit_nlm(void) 750 { 751 /* FIXME: delete all NLM clients */ 752 nlm_shutdown_hosts(); 753 lockd_remove_procfs(); 754 unregister_pernet_subsys(&lockd_net_ops); 755 #ifdef CONFIG_SYSCTL 756 unregister_sysctl_table(nlm_sysctl_table); 757 #endif 758 } 759 760 module_init(init_nlm); 761 module_exit(exit_nlm); 762 763 /* 764 * Define NLM program and procedures 765 */ 766 static unsigned int nlmsvc_version1_count[17]; 767 static const struct svc_version nlmsvc_version1 = { 768 .vs_vers = 1, 769 .vs_nproc = 17, 770 .vs_proc = nlmsvc_procedures, 771 .vs_count = nlmsvc_version1_count, 772 .vs_xdrsize = NLMSVC_XDRSIZE, 773 }; 774 static unsigned int nlmsvc_version3_count[24]; 775 static const struct svc_version nlmsvc_version3 = { 776 .vs_vers = 3, 777 .vs_nproc = 24, 778 .vs_proc = nlmsvc_procedures, 779 .vs_count = nlmsvc_version3_count, 780 .vs_xdrsize = NLMSVC_XDRSIZE, 781 }; 782 #ifdef CONFIG_LOCKD_V4 783 static unsigned int nlmsvc_version4_count[24]; 784 static const struct svc_version nlmsvc_version4 = { 785 .vs_vers = 4, 786 .vs_nproc = 24, 787 .vs_proc = nlmsvc_procedures4, 788 .vs_count = nlmsvc_version4_count, 789 .vs_xdrsize = NLMSVC_XDRSIZE, 790 }; 791 #endif 792 static const struct svc_version *nlmsvc_version[] = { 793 [1] = &nlmsvc_version1, 794 [3] = &nlmsvc_version3, 795 #ifdef CONFIG_LOCKD_V4 796 [4] = &nlmsvc_version4, 797 #endif 798 }; 799 800 static struct svc_stat nlmsvc_stats; 801 802 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version) 803 static struct svc_program nlmsvc_program = { 804 .pg_prog = NLM_PROGRAM, /* program number */ 805 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */ 806 .pg_vers = nlmsvc_version, /* version table */ 807 .pg_name = "lockd", /* service name */ 808 .pg_class = "nfsd", /* share authentication with nfsd */ 809 .pg_stats = &nlmsvc_stats, /* stats table */ 810 .pg_authenticate = &lockd_authenticate /* export authentication */ 811 }; 812