1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/lockd/svc.c 4 * 5 * This is the central lockd service. 6 * 7 * FIXME: Separate the lockd NFS server functionality from the lockd NFS 8 * client functionality. Oh why didn't Sun create two separate 9 * services in the first place? 10 * 11 * Authors: Olaf Kirch (okir@monad.swb.de) 12 * 13 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/sysctl.h> 19 #include <linux/moduleparam.h> 20 21 #include <linux/sched/signal.h> 22 #include <linux/errno.h> 23 #include <linux/in.h> 24 #include <linux/uio.h> 25 #include <linux/smp.h> 26 #include <linux/mutex.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 #include "netlink.h" 45 46 #define NLMDBG_FACILITY NLMDBG_SVC 47 #define LOCKD_BUFSIZE (1024 + NLMSVC_XDRSIZE) 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 svc_serv *nlmsvc_serv; 57 58 static void nlmsvc_request_retry(struct timer_list *tl) 59 { 60 svc_wake_up(nlmsvc_serv); 61 } 62 DEFINE_TIMER(nlmsvc_retry, nlmsvc_request_retry); 63 64 unsigned int lockd_net_id; 65 66 /* 67 * These can be set at insmod time (useful for NFS as root filesystem), 68 * and also changed through the sysctl interface. -- Jamie Lokier, Aug 2003 69 */ 70 static unsigned long nlm_grace_period; 71 unsigned long nlm_timeout = LOCKD_DFLT_TIMEO; 72 static int nlm_udpport, nlm_tcpport; 73 74 /* 75 * Constants needed for the sysctl interface. 76 */ 77 static const unsigned long nlm_grace_period_min = 0; 78 static const unsigned long nlm_grace_period_max = 240; 79 static const unsigned long nlm_timeout_min = 3; 80 static const unsigned long nlm_timeout_max = 20; 81 82 #ifdef CONFIG_SYSCTL 83 static const int nlm_port_min = 0, nlm_port_max = 65535; 84 static struct ctl_table_header * nlm_sysctl_table; 85 #endif 86 87 static unsigned long get_lockd_grace_period(struct net *net) 88 { 89 struct lockd_net *ln = net_generic(net, lockd_net_id); 90 91 /* Return the net-ns specific grace period, if there is one */ 92 if (ln->gracetime) 93 return ln->gracetime * HZ; 94 95 /* Note: nlm_timeout should always be nonzero */ 96 if (nlm_grace_period) 97 return roundup(nlm_grace_period, nlm_timeout) * HZ; 98 else 99 return nlm_timeout * 5 * HZ; 100 } 101 102 static void grace_ender(struct work_struct *grace) 103 { 104 struct delayed_work *dwork = to_delayed_work(grace); 105 struct lockd_net *ln = container_of(dwork, struct lockd_net, 106 grace_period_end); 107 108 locks_end_grace(&ln->lockd_manager); 109 } 110 111 static void set_grace_period(struct net *net) 112 { 113 unsigned long grace_period = get_lockd_grace_period(net); 114 struct lockd_net *ln = net_generic(net, lockd_net_id); 115 116 locks_start_grace(net, &ln->lockd_manager); 117 cancel_delayed_work_sync(&ln->grace_period_end); 118 schedule_delayed_work(&ln->grace_period_end, grace_period); 119 } 120 121 /* 122 * This is the lockd kernel thread 123 */ 124 static int 125 lockd(void *vrqstp) 126 { 127 struct svc_rqst *rqstp = vrqstp; 128 struct net *net = &init_net; 129 struct lockd_net *ln = net_generic(net, lockd_net_id); 130 131 svc_thread_init_status(rqstp, 0); 132 133 /* try_to_freeze() is called from svc_recv() */ 134 set_freezable(); 135 136 dprintk("NFS locking service started (ver " LOCKD_VERSION ").\n"); 137 138 /* 139 * The main request loop. We don't terminate until the last 140 * NFS mount or NFS daemon has gone away. 141 */ 142 while (!svc_thread_should_stop(rqstp)) { 143 nlmsvc_retry_blocked(rqstp); 144 svc_recv(rqstp); 145 } 146 if (nlmsvc_ops) 147 nlmsvc_invalidate_all(); 148 nlm_shutdown_hosts(); 149 cancel_delayed_work_sync(&ln->grace_period_end); 150 locks_end_grace(&ln->lockd_manager); 151 152 dprintk("lockd_down: service stopped\n"); 153 154 svc_exit_thread(rqstp); 155 return 0; 156 } 157 158 static int create_lockd_listener(struct svc_serv *serv, const char *name, 159 struct net *net, const int family, 160 const unsigned short port, 161 const struct cred *cred) 162 { 163 struct svc_xprt *xprt; 164 165 xprt = svc_find_xprt(serv, name, net, family, 0); 166 if (xprt == NULL) 167 return svc_xprt_create(serv, name, net, family, port, 168 SVC_SOCK_DEFAULTS, cred); 169 svc_xprt_put(xprt); 170 return 0; 171 } 172 173 static int create_lockd_family(struct svc_serv *serv, struct net *net, 174 const int family, const struct cred *cred) 175 { 176 struct lockd_net *ln = net_generic(net, lockd_net_id); 177 int err; 178 179 err = create_lockd_listener(serv, "udp", net, family, 180 ln->udp_port ? ln->udp_port : nlm_udpport, cred); 181 if (err < 0) 182 return err; 183 184 return create_lockd_listener(serv, "tcp", net, family, 185 ln->tcp_port ? ln->tcp_port : nlm_tcpport, cred); 186 } 187 188 /* 189 * Ensure there are active UDP and TCP listeners for lockd. 190 * 191 * Even if we have only TCP NFS mounts and/or TCP NFSDs, some 192 * local services (such as rpc.statd) still require UDP, and 193 * some NFS servers do not yet support NLM over TCP. 194 * 195 * Returns zero if all listeners are available; otherwise a 196 * negative errno value is returned. 197 */ 198 static int make_socks(struct svc_serv *serv, struct net *net, 199 const struct cred *cred) 200 { 201 static int warned; 202 int err; 203 204 err = create_lockd_family(serv, net, PF_INET, cred); 205 if (err < 0) 206 goto out_err; 207 208 err = create_lockd_family(serv, net, PF_INET6, cred); 209 if (err < 0 && err != -EAFNOSUPPORT) 210 goto out_err; 211 212 warned = 0; 213 return 0; 214 215 out_err: 216 if (warned++ == 0) 217 printk(KERN_WARNING 218 "lockd_up: makesock failed, error=%d\n", err); 219 svc_xprt_destroy_all(serv, net, true); 220 return err; 221 } 222 223 static int lockd_up_net(struct svc_serv *serv, struct net *net, 224 const struct cred *cred) 225 { 226 struct lockd_net *ln = net_generic(net, lockd_net_id); 227 int error; 228 229 if (ln->nlmsvc_users++) 230 return 0; 231 232 error = svc_bind(serv, net); 233 if (error) 234 goto err_bind; 235 236 error = make_socks(serv, net, cred); 237 if (error < 0) 238 goto err_bind; 239 set_grace_period(net); 240 dprintk("%s: per-net data created; net=%x\n", __func__, net->ns.inum); 241 return 0; 242 243 err_bind: 244 ln->nlmsvc_users--; 245 return error; 246 } 247 248 static void lockd_down_net(struct svc_serv *serv, struct net *net) 249 { 250 struct lockd_net *ln = net_generic(net, lockd_net_id); 251 252 if (ln->nlmsvc_users) { 253 if (--ln->nlmsvc_users == 0) { 254 nlm_shutdown_hosts_net(net); 255 cancel_delayed_work_sync(&ln->grace_period_end); 256 locks_end_grace(&ln->lockd_manager); 257 svc_xprt_destroy_all(serv, net, true); 258 } 259 } else { 260 pr_err("%s: no users! net=%x\n", 261 __func__, net->ns.inum); 262 BUG(); 263 } 264 } 265 266 static int lockd_inetaddr_event(struct notifier_block *this, 267 unsigned long event, void *ptr) 268 { 269 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 270 struct sockaddr_in sin; 271 272 if (event != NETDEV_DOWN) 273 goto out; 274 275 if (nlmsvc_serv) { 276 dprintk("lockd_inetaddr_event: removed %pI4\n", 277 &ifa->ifa_local); 278 sin.sin_family = AF_INET; 279 sin.sin_addr.s_addr = ifa->ifa_local; 280 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin); 281 } 282 283 out: 284 return NOTIFY_DONE; 285 } 286 287 static struct notifier_block lockd_inetaddr_notifier = { 288 .notifier_call = lockd_inetaddr_event, 289 }; 290 291 #if IS_ENABLED(CONFIG_IPV6) 292 static int lockd_inet6addr_event(struct notifier_block *this, 293 unsigned long event, void *ptr) 294 { 295 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; 296 struct sockaddr_in6 sin6; 297 298 if (event != NETDEV_DOWN) 299 goto out; 300 301 if (nlmsvc_serv) { 302 dprintk("lockd_inet6addr_event: removed %pI6\n", &ifa->addr); 303 sin6.sin6_family = AF_INET6; 304 sin6.sin6_addr = ifa->addr; 305 if (ipv6_addr_type(&sin6.sin6_addr) & IPV6_ADDR_LINKLOCAL) 306 sin6.sin6_scope_id = ifa->idev->dev->ifindex; 307 svc_age_temp_xprts_now(nlmsvc_serv, (struct sockaddr *)&sin6); 308 } 309 310 out: 311 return NOTIFY_DONE; 312 } 313 314 static struct notifier_block lockd_inet6addr_notifier = { 315 .notifier_call = lockd_inet6addr_event, 316 }; 317 #endif 318 319 static int lockd_get(void) 320 { 321 struct svc_serv *serv; 322 int error; 323 324 if (nlmsvc_serv) { 325 nlmsvc_users++; 326 return 0; 327 } 328 329 /* 330 * Sanity check: if there's no pid, 331 * we should be the first user ... 332 */ 333 if (nlmsvc_users) 334 printk(KERN_WARNING 335 "lockd_up: no pid, %d users??\n", nlmsvc_users); 336 337 serv = svc_create(&nlmsvc_program, LOCKD_BUFSIZE, lockd); 338 if (!serv) { 339 printk(KERN_WARNING "lockd_up: create service failed\n"); 340 return -ENOMEM; 341 } 342 343 error = svc_set_num_threads(serv, NULL, 1); 344 if (error < 0) { 345 svc_destroy(&serv); 346 return error; 347 } 348 349 nlmsvc_serv = serv; 350 register_inetaddr_notifier(&lockd_inetaddr_notifier); 351 #if IS_ENABLED(CONFIG_IPV6) 352 register_inet6addr_notifier(&lockd_inet6addr_notifier); 353 #endif 354 dprintk("lockd_up: service created\n"); 355 nlmsvc_users++; 356 return 0; 357 } 358 359 static void lockd_put(void) 360 { 361 if (WARN(nlmsvc_users <= 0, "lockd_down: no users!\n")) 362 return; 363 if (--nlmsvc_users) 364 return; 365 366 unregister_inetaddr_notifier(&lockd_inetaddr_notifier); 367 #if IS_ENABLED(CONFIG_IPV6) 368 unregister_inet6addr_notifier(&lockd_inet6addr_notifier); 369 #endif 370 371 svc_set_num_threads(nlmsvc_serv, NULL, 0); 372 timer_delete_sync(&nlmsvc_retry); 373 svc_destroy(&nlmsvc_serv); 374 dprintk("lockd_down: service destroyed\n"); 375 } 376 377 /* 378 * Bring up the lockd process if it's not already up. 379 */ 380 int lockd_up(struct net *net, const struct cred *cred) 381 { 382 int error; 383 384 mutex_lock(&nlmsvc_mutex); 385 386 error = lockd_get(); 387 if (error) 388 goto err; 389 390 error = lockd_up_net(nlmsvc_serv, net, cred); 391 if (error < 0) { 392 lockd_put(); 393 goto err; 394 } 395 396 err: 397 mutex_unlock(&nlmsvc_mutex); 398 return error; 399 } 400 EXPORT_SYMBOL_GPL(lockd_up); 401 402 /* 403 * Decrement the user count and bring down lockd if we're the last. 404 */ 405 void 406 lockd_down(struct net *net) 407 { 408 mutex_lock(&nlmsvc_mutex); 409 lockd_down_net(nlmsvc_serv, net); 410 lockd_put(); 411 mutex_unlock(&nlmsvc_mutex); 412 } 413 EXPORT_SYMBOL_GPL(lockd_down); 414 415 #ifdef CONFIG_SYSCTL 416 417 /* 418 * Sysctl parameters (same as module parameters, different interface). 419 */ 420 421 static const struct ctl_table nlm_sysctls[] = { 422 { 423 .procname = "nlm_grace_period", 424 .data = &nlm_grace_period, 425 .maxlen = sizeof(unsigned long), 426 .mode = 0644, 427 .proc_handler = proc_doulongvec_minmax, 428 .extra1 = (unsigned long *) &nlm_grace_period_min, 429 .extra2 = (unsigned long *) &nlm_grace_period_max, 430 }, 431 { 432 .procname = "nlm_timeout", 433 .data = &nlm_timeout, 434 .maxlen = sizeof(unsigned long), 435 .mode = 0644, 436 .proc_handler = proc_doulongvec_minmax, 437 .extra1 = (unsigned long *) &nlm_timeout_min, 438 .extra2 = (unsigned long *) &nlm_timeout_max, 439 }, 440 { 441 .procname = "nlm_udpport", 442 .data = &nlm_udpport, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = proc_dointvec_minmax, 446 .extra1 = (int *) &nlm_port_min, 447 .extra2 = (int *) &nlm_port_max, 448 }, 449 { 450 .procname = "nlm_tcpport", 451 .data = &nlm_tcpport, 452 .maxlen = sizeof(int), 453 .mode = 0644, 454 .proc_handler = proc_dointvec_minmax, 455 .extra1 = (int *) &nlm_port_min, 456 .extra2 = (int *) &nlm_port_max, 457 }, 458 { 459 .procname = "nsm_use_hostnames", 460 .data = &nsm_use_hostnames, 461 .maxlen = sizeof(bool), 462 .mode = 0644, 463 .proc_handler = proc_dobool, 464 }, 465 { 466 .procname = "nsm_local_state", 467 .data = &nsm_local_state, 468 .maxlen = sizeof(nsm_local_state), 469 .mode = 0644, 470 .proc_handler = proc_douintvec, 471 .extra1 = SYSCTL_ZERO, 472 }, 473 }; 474 475 #endif /* CONFIG_SYSCTL */ 476 477 /* 478 * Module (and sysfs) parameters. 479 */ 480 481 #define param_set_min_max(name, type, which_strtol, min, max) \ 482 static int param_set_##name(const char *val, const struct kernel_param *kp) \ 483 { \ 484 char *endp; \ 485 __typeof__(type) num = which_strtol(val, &endp, 0); \ 486 if (endp == val || *endp || num < (min) || num > (max)) \ 487 return -EINVAL; \ 488 *((type *) kp->arg) = num; \ 489 return 0; \ 490 } 491 492 static inline int is_callback(u32 proc) 493 { 494 return proc == NLMPROC_GRANTED 495 || proc == NLMPROC_GRANTED_MSG 496 || proc == NLMPROC_TEST_RES 497 || proc == NLMPROC_LOCK_RES 498 || proc == NLMPROC_CANCEL_RES 499 || proc == NLMPROC_UNLOCK_RES 500 || proc == NLMPROC_NSM_NOTIFY; 501 } 502 503 504 static enum svc_auth_status lockd_authenticate(struct svc_rqst *rqstp) 505 { 506 rqstp->rq_client = NULL; 507 switch (rqstp->rq_authop->flavour) { 508 case RPC_AUTH_NULL: 509 case RPC_AUTH_UNIX: 510 rqstp->rq_auth_stat = rpc_auth_ok; 511 if (rqstp->rq_proc == 0) 512 return SVC_OK; 513 if (is_callback(rqstp->rq_proc)) { 514 /* Leave it to individual procedures to 515 * call nlmsvc_lookup_host(rqstp) 516 */ 517 return SVC_OK; 518 } 519 return svc_set_client(rqstp); 520 } 521 rqstp->rq_auth_stat = rpc_autherr_badcred; 522 return SVC_DENIED; 523 } 524 525 526 param_set_min_max(port, int, simple_strtol, 0, 65535) 527 param_set_min_max(grace_period, unsigned long, simple_strtoul, 528 nlm_grace_period_min, nlm_grace_period_max) 529 param_set_min_max(timeout, unsigned long, simple_strtoul, 530 nlm_timeout_min, nlm_timeout_max) 531 532 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 533 MODULE_DESCRIPTION("NFS file locking service version " LOCKD_VERSION "."); 534 MODULE_LICENSE("GPL"); 535 536 module_param_call(nlm_grace_period, param_set_grace_period, param_get_ulong, 537 &nlm_grace_period, 0644); 538 module_param_call(nlm_timeout, param_set_timeout, param_get_ulong, 539 &nlm_timeout, 0644); 540 module_param_call(nlm_udpport, param_set_port, param_get_int, 541 &nlm_udpport, 0644); 542 module_param_call(nlm_tcpport, param_set_port, param_get_int, 543 &nlm_tcpport, 0644); 544 module_param(nsm_use_hostnames, bool, 0644); 545 546 static int lockd_init_net(struct net *net) 547 { 548 struct lockd_net *ln = net_generic(net, lockd_net_id); 549 550 INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender); 551 INIT_LIST_HEAD(&ln->lockd_manager.list); 552 ln->lockd_manager.block_opens = false; 553 INIT_LIST_HEAD(&ln->nsm_handles); 554 return 0; 555 } 556 557 static void lockd_exit_net(struct net *net) 558 { 559 struct lockd_net *ln = net_generic(net, lockd_net_id); 560 561 WARN_ONCE(!list_empty(&ln->lockd_manager.list), 562 "net %x %s: lockd_manager.list is not empty\n", 563 net->ns.inum, __func__); 564 WARN_ONCE(!list_empty(&ln->nsm_handles), 565 "net %x %s: nsm_handles list is not empty\n", 566 net->ns.inum, __func__); 567 WARN_ONCE(delayed_work_pending(&ln->grace_period_end), 568 "net %x %s: grace_period_end was not cancelled\n", 569 net->ns.inum, __func__); 570 } 571 572 static struct pernet_operations lockd_net_ops = { 573 .init = lockd_init_net, 574 .exit = lockd_exit_net, 575 .id = &lockd_net_id, 576 .size = sizeof(struct lockd_net), 577 }; 578 579 580 /* 581 * Initialising and terminating the module. 582 */ 583 584 static int __init init_nlm(void) 585 { 586 int err; 587 588 #ifdef CONFIG_SYSCTL 589 err = -ENOMEM; 590 nlm_sysctl_table = register_sysctl("fs/nfs", nlm_sysctls); 591 if (nlm_sysctl_table == NULL) 592 goto err_sysctl; 593 #endif 594 err = register_pernet_subsys(&lockd_net_ops); 595 if (err) 596 goto err_pernet; 597 598 err = genl_register_family(&lockd_nl_family); 599 if (err) 600 goto err_netlink; 601 602 err = lockd_create_procfs(); 603 if (err) 604 goto err_procfs; 605 606 return 0; 607 608 err_procfs: 609 genl_unregister_family(&lockd_nl_family); 610 err_netlink: 611 unregister_pernet_subsys(&lockd_net_ops); 612 err_pernet: 613 #ifdef CONFIG_SYSCTL 614 unregister_sysctl_table(nlm_sysctl_table); 615 err_sysctl: 616 #endif 617 return err; 618 } 619 620 static void __exit exit_nlm(void) 621 { 622 /* FIXME: delete all NLM clients */ 623 nlm_shutdown_hosts(); 624 genl_unregister_family(&lockd_nl_family); 625 lockd_remove_procfs(); 626 unregister_pernet_subsys(&lockd_net_ops); 627 #ifdef CONFIG_SYSCTL 628 unregister_sysctl_table(nlm_sysctl_table); 629 #endif 630 } 631 632 module_init(init_nlm); 633 module_exit(exit_nlm); 634 635 /** 636 * nlmsvc_dispatch - Process an NLM Request 637 * @rqstp: incoming request 638 * 639 * Return values: 640 * %0: Processing complete; do not send a Reply 641 * %1: Processing complete; send Reply in rqstp->rq_res 642 */ 643 static int nlmsvc_dispatch(struct svc_rqst *rqstp) 644 { 645 const struct svc_procedure *procp = rqstp->rq_procinfo; 646 __be32 *statp = rqstp->rq_accept_statp; 647 648 if (!procp->pc_decode(rqstp, &rqstp->rq_arg_stream)) 649 goto out_decode_err; 650 651 *statp = procp->pc_func(rqstp); 652 if (*statp == rpc_drop_reply) 653 return 0; 654 if (*statp != rpc_success) 655 return 1; 656 657 if (!procp->pc_encode(rqstp, &rqstp->rq_res_stream)) 658 goto out_encode_err; 659 660 return 1; 661 662 out_decode_err: 663 *statp = rpc_garbage_args; 664 return 1; 665 666 out_encode_err: 667 *statp = rpc_system_err; 668 return 1; 669 } 670 671 /* 672 * Define NLM program and procedures 673 */ 674 static DEFINE_PER_CPU_ALIGNED(unsigned long, nlmsvc_version1_count[17]); 675 static const struct svc_version nlmsvc_version1 = { 676 .vs_vers = 1, 677 .vs_nproc = 17, 678 .vs_proc = nlmsvc_procedures, 679 .vs_count = nlmsvc_version1_count, 680 .vs_dispatch = nlmsvc_dispatch, 681 .vs_xdrsize = NLMSVC_XDRSIZE, 682 }; 683 684 static DEFINE_PER_CPU_ALIGNED(unsigned long, 685 nlmsvc_version3_count[ARRAY_SIZE(nlmsvc_procedures)]); 686 static const struct svc_version nlmsvc_version3 = { 687 .vs_vers = 3, 688 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures), 689 .vs_proc = nlmsvc_procedures, 690 .vs_count = nlmsvc_version3_count, 691 .vs_dispatch = nlmsvc_dispatch, 692 .vs_xdrsize = NLMSVC_XDRSIZE, 693 }; 694 695 #ifdef CONFIG_LOCKD_V4 696 static DEFINE_PER_CPU_ALIGNED(unsigned long, 697 nlmsvc_version4_count[ARRAY_SIZE(nlmsvc_procedures4)]); 698 static const struct svc_version nlmsvc_version4 = { 699 .vs_vers = 4, 700 .vs_nproc = ARRAY_SIZE(nlmsvc_procedures4), 701 .vs_proc = nlmsvc_procedures4, 702 .vs_count = nlmsvc_version4_count, 703 .vs_dispatch = nlmsvc_dispatch, 704 .vs_xdrsize = NLMSVC_XDRSIZE, 705 }; 706 #endif 707 708 static const struct svc_version *nlmsvc_version[] = { 709 [1] = &nlmsvc_version1, 710 [3] = &nlmsvc_version3, 711 #ifdef CONFIG_LOCKD_V4 712 [4] = &nlmsvc_version4, 713 #endif 714 }; 715 716 #define NLM_NRVERS ARRAY_SIZE(nlmsvc_version) 717 static struct svc_program nlmsvc_program = { 718 .pg_prog = NLM_PROGRAM, /* program number */ 719 .pg_nvers = NLM_NRVERS, /* number of entries in nlmsvc_version */ 720 .pg_vers = nlmsvc_version, /* version table */ 721 .pg_name = "lockd", /* service name */ 722 .pg_class = "nfsd", /* share authentication with nfsd */ 723 .pg_authenticate = &lockd_authenticate, /* export authentication */ 724 .pg_init_request = svc_generic_init_request, 725 .pg_rpcbind_set = svc_generic_rpcbind_set, 726 }; 727 728 /** 729 * lockd_nl_server_set_doit - set the lockd server parameters via netlink 730 * @skb: reply buffer 731 * @info: netlink metadata and command arguments 732 * 733 * This updates the per-net values. When updating the values in the init_net 734 * namespace, also update the "legacy" global values. 735 * 736 * Return 0 on success or a negative errno. 737 */ 738 int lockd_nl_server_set_doit(struct sk_buff *skb, struct genl_info *info) 739 { 740 struct net *net = genl_info_net(info); 741 struct lockd_net *ln = net_generic(net, lockd_net_id); 742 const struct nlattr *attr; 743 744 if (GENL_REQ_ATTR_CHECK(info, LOCKD_A_SERVER_GRACETIME)) 745 return -EINVAL; 746 747 if (info->attrs[LOCKD_A_SERVER_GRACETIME] || 748 info->attrs[LOCKD_A_SERVER_TCP_PORT] || 749 info->attrs[LOCKD_A_SERVER_UDP_PORT]) { 750 attr = info->attrs[LOCKD_A_SERVER_GRACETIME]; 751 if (attr) { 752 u32 gracetime = nla_get_u32(attr); 753 754 if (gracetime > nlm_grace_period_max) 755 return -EINVAL; 756 757 ln->gracetime = gracetime; 758 759 if (net == &init_net) 760 nlm_grace_period = gracetime; 761 } 762 763 attr = info->attrs[LOCKD_A_SERVER_TCP_PORT]; 764 if (attr) { 765 ln->tcp_port = nla_get_u16(attr); 766 if (net == &init_net) 767 nlm_tcpport = ln->tcp_port; 768 } 769 770 attr = info->attrs[LOCKD_A_SERVER_UDP_PORT]; 771 if (attr) { 772 ln->udp_port = nla_get_u16(attr); 773 if (net == &init_net) 774 nlm_udpport = ln->udp_port; 775 } 776 } 777 return 0; 778 } 779 780 /** 781 * lockd_nl_server_get_doit - get lockd server parameters via netlink 782 * @skb: reply buffer 783 * @info: netlink metadata and command arguments 784 * 785 * Return 0 on success or a negative errno. 786 */ 787 int lockd_nl_server_get_doit(struct sk_buff *skb, struct genl_info *info) 788 { 789 struct net *net = genl_info_net(info); 790 struct lockd_net *ln = net_generic(net, lockd_net_id); 791 void *hdr; 792 int err; 793 794 skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); 795 if (!skb) 796 return -ENOMEM; 797 798 hdr = genlmsg_iput(skb, info); 799 if (!hdr) { 800 err = -EMSGSIZE; 801 goto err_free_msg; 802 } 803 804 err = nla_put_u32(skb, LOCKD_A_SERVER_GRACETIME, ln->gracetime) || 805 nla_put_u16(skb, LOCKD_A_SERVER_TCP_PORT, ln->tcp_port) || 806 nla_put_u16(skb, LOCKD_A_SERVER_UDP_PORT, ln->udp_port); 807 if (err) 808 goto err_free_msg; 809 810 genlmsg_end(skb, hdr); 811 812 return genlmsg_reply(skb, info); 813 err_free_msg: 814 nlmsg_free(skb); 815 816 return err; 817 } 818