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
nlmsvc_request_retry(struct timer_list * tl)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
get_lockd_grace_period(struct net * net)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
grace_ender(struct work_struct * grace)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
set_grace_period(struct net * net)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
lockd(void * vrqstp)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
create_lockd_listener(struct svc_serv * serv,const char * name,struct net * net,const int family,const unsigned short port,const struct cred * cred)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
create_lockd_family(struct svc_serv * serv,struct net * net,const int family,const struct cred * cred)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 */
make_socks(struct svc_serv * serv,struct net * net,const struct cred * cred)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
lockd_up_net(struct svc_serv * serv,struct net * net,const struct cred * cred)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
lockd_down_net(struct svc_serv * serv,struct net * net)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
lockd_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)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)
lockd_inet6addr_event(struct notifier_block * this,unsigned long event,void * ptr)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
lockd_get(void)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
lockd_put(void)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 */
lockd_up(struct net * net,const struct cred * cred)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
lockd_down(struct net * net)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
is_callback(u32 proc)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
lockd_authenticate(struct svc_rqst * rqstp)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
lockd_init_net(struct net * net)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
lockd_exit_net(struct net * net)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
init_nlm(void)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
exit_nlm(void)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 */
nlmsvc_dispatch(struct svc_rqst * rqstp)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 */
lockd_nl_server_set_doit(struct sk_buff * skb,struct genl_info * info)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 */
lockd_nl_server_get_doit(struct sk_buff * skb,struct genl_info * info)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